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         conf.changed = changed;
 172
 173         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 174             sdata->vif.type == NL80211_IFTYPE_ADHOC)
 175                 conf.bssid = sdata->u.sta.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                 u8 zero[ETH_ALEN] = { 0 };
 180                 conf.bssid = zero;
 181         } else {
 182                 WARN_ON(1);
 183                 return -EINVAL;
 184         }
 185
 186         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 187                 return -EINVAL;
 188
 189         return local->ops->config_interface(local_to_hw(local),
 190                                             &sdata->vif, &conf);
 191 }
 192
 193 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 194 {
 195         struct ieee80211_channel *chan;
 196         int ret = 0;
 197         int power;
 198         enum nl80211_channel_type channel_type;
 199
 200         might_sleep();
 201
 202         if (local->sw_scanning) {
 203                 chan = local->scan_channel;
 204                 channel_type = NL80211_CHAN_NO_HT;
 205         } else {
 206                 chan = local->oper_channel;
 207                 channel_type = local->oper_channel_type;
 208         }
 209
 210         if (chan != local->hw.conf.channel ||
 211             channel_type != local->hw.conf.ht.channel_type) {
 212                 local->hw.conf.channel = chan;
 213                 local->hw.conf.ht.channel_type = channel_type;
 214                 switch (channel_type) {
 215                 case NL80211_CHAN_NO_HT:
 216                         local->hw.conf.ht.enabled = false;
 217                         break;
 218                 case NL80211_CHAN_HT20:
 219                 case NL80211_CHAN_HT40MINUS:
 220                 case NL80211_CHAN_HT40PLUS:
 221                         local->hw.conf.ht.enabled = true;
 222                         break;
 223                 }
 224                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 225         }
 226
 227         if (!local->hw.conf.power_level)
 228                 power = chan->max_power;
 229         else
 230                 power = min(chan->max_power, local->hw.conf.power_level);
 231         if (local->hw.conf.power_level != power) {
 232                 changed |= IEEE80211_CONF_CHANGE_POWER;
 233                 local->hw.conf.power_level = power;
 234         }
 235
 236         if (changed && local->open_count) {
 237                 ret = local->ops->config(local_to_hw(local), changed);
 238                 /*
 239                  * Goal:
 240                  * HW reconfiguration should never fail, the driver has told
 241                  * us what it can support so it should live up to that promise.
 242                  *
 243                  * Current status:
 244                  * rfkill is not integrated with mac80211 and a
 245                  * configuration command can thus fail if hardware rfkill
 246                  * is enabled
 247                  *
 248                  * FIXME: integrate rfkill with mac80211 and then add this
 249                  * WARN_ON() back
 250                  *
 251                  */
 252                 /* WARN_ON(ret); */
 253         }
 254
 255         return ret;
 256 }
 257
 258 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 259                                       u32 changed)
 260 {
 261         struct ieee80211_local *local = sdata->local;
 262
 263         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 264                 return;
 265
 266         if (!changed)
 267                 return;
 268
 269         if (local->ops->bss_info_changed)
 270                 local->ops->bss_info_changed(local_to_hw(local),
 271                                              &sdata->vif,
 272                                              &sdata->vif.bss_conf,
 273                                              changed);
 274 }
 275
 276 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 277 {
 278         sdata->vif.bss_conf.use_cts_prot = false;
 279         sdata->vif.bss_conf.use_short_preamble = false;
 280         sdata->vif.bss_conf.use_short_slot = false;
 281         return BSS_CHANGED_ERP_CTS_PROT |
 282                BSS_CHANGED_ERP_PREAMBLE |
 283                BSS_CHANGED_ERP_SLOT;
 284 }
 285
 286 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 287                                  struct sk_buff *skb)
 288 {
 289         struct ieee80211_local *local = hw_to_local(hw);
 290         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 291         int tmp;
 292
 293         skb->dev = local->mdev;
 294         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 295         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 296                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 297         tmp = skb_queue_len(&local->skb_queue) +
 298                 skb_queue_len(&local->skb_queue_unreliable);
 299         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 300                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 301                 dev_kfree_skb_irq(skb);
 302                 tmp--;
 303                 I802_DEBUG_INC(local->tx_status_drop);
 304         }
 305         tasklet_schedule(&local->tasklet);
 306 }
 307 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 308
 309 static void ieee80211_tasklet_handler(unsigned long data)
 310 {
 311         struct ieee80211_local *local = (struct ieee80211_local *) data;
 312         struct sk_buff *skb;
 313         struct ieee80211_rx_status rx_status;
 314         struct ieee80211_ra_tid *ra_tid;
 315
 316         while ((skb = skb_dequeue(&local->skb_queue)) ||
 317                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 318                 switch (skb->pkt_type) {
 319                 case IEEE80211_RX_MSG:
 320                         /* status is in skb->cb */
 321                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 322                         /* Clear skb->pkt_type in order to not confuse kernel
 323                          * netstack. */
 324                         skb->pkt_type = 0;
 325                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 326                         break;
 327                 case IEEE80211_TX_STATUS_MSG:
 328                         skb->pkt_type = 0;
 329                         ieee80211_tx_status(local_to_hw(local), skb);
 330                         break;
 331                 case IEEE80211_DELBA_MSG:
 332                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 333                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 334                                                 ra_tid->ra, ra_tid->tid);
 335                         dev_kfree_skb(skb);
 336                         break;
 337                 case IEEE80211_ADDBA_MSG:
 338                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 339                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 340                                                  ra_tid->ra, ra_tid->tid);
 341                         dev_kfree_skb(skb);
 342                         break ;
 343                 default:
 344                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 345                              skb->pkt_type);
 346                         dev_kfree_skb(skb);
 347                         break;
 348                 }
 349         }
 350 }
 351
 352 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 353  * make a prepared TX frame (one that has been given to hw) to look like brand
 354  * new IEEE 802.11 frame that is ready to go through TX processing again.
 355  */
 356 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 357                                       struct ieee80211_key *key,
 358                                       struct sk_buff *skb)
 359 {
 360         unsigned int hdrlen, iv_len, mic_len;
 361         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 362
 363         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 364
 365         if (!key)
 366                 goto no_key;
 367
 368         switch (key->conf.alg) {
 369         case ALG_WEP:
 370                 iv_len = WEP_IV_LEN;
 371                 mic_len = WEP_ICV_LEN;
 372                 break;
 373         case ALG_TKIP:
 374                 iv_len = TKIP_IV_LEN;
 375                 mic_len = TKIP_ICV_LEN;
 376                 break;
 377         case ALG_CCMP:
 378                 iv_len = CCMP_HDR_LEN;
 379                 mic_len = CCMP_MIC_LEN;
 380                 break;
 381         default:
 382                 goto no_key;
 383         }
 384
 385         if (skb->len >= hdrlen + mic_len &&
 386             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 387                 skb_trim(skb, skb->len - mic_len);
 388         if (skb->len >= hdrlen + iv_len) {
 389                 memmove(skb->data + iv_len, skb->data, hdrlen);
 390                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 391         }
 392
 393 no_key:
 394         if (ieee80211_is_data_qos(hdr->frame_control)) {
 395                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 396                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 397                         hdrlen - IEEE80211_QOS_CTL_LEN);
 398                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 399         }
 400 }
 401
 402 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 403                                             struct sta_info *sta,
 404                                             struct sk_buff *skb)
 405 {
 406         sta->tx_filtered_count++;
 407
 408         /*
 409          * Clear the TX filter mask for this STA when sending the next
 410          * packet. If the STA went to power save mode, this will happen
 411          * when it wakes up for the next time.
 412          */
 413         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 414
 415         /*
 416          * This code races in the following way:
 417          *
 418          *  (1) STA sends frame indicating it will go to sleep and does so
 419          *  (2) hardware/firmware adds STA to filter list, passes frame up
 420          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 421          *  (4) we get TX status before having processed the frame and
 422          *      knowing that the STA has gone to sleep.
 423          *
 424          * This is actually quite unlikely even when both those events are
 425          * processed from interrupts coming in quickly after one another or
 426          * even at the same time because we queue both TX status events and
 427          * RX frames to be processed by a tasklet and process them in the
 428          * same order that they were received or TX status last. Hence, there
 429          * is no race as long as the frame RX is processed before the next TX
 430          * status, which drivers can ensure, see below.
 431          *
 432          * Note that this can only happen if the hardware or firmware can
 433          * actually add STAs to the filter list, if this is done by the
 434          * driver in response to set_tim() (which will only reduce the race
 435          * this whole filtering tries to solve, not completely solve it)
 436          * this situation cannot happen.
 437          *
 438          * To completely solve this race drivers need to make sure that they
 439          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 440          *      functions and
 441          *  (b) always process RX events before TX status events if ordering
 442          *      can be unknown, for example with different interrupt status
 443          *      bits.
 444          */
 445         if (test_sta_flags(sta, WLAN_STA_PS) &&
 446             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 447                 ieee80211_remove_tx_extra(local, sta->key, skb);
 448                 skb_queue_tail(&sta->tx_filtered, skb);
 449                 return;
 450         }
 451
 452         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 453                 /* Software retry the packet once */
 454                 skb->requeue = 1;
 455                 ieee80211_remove_tx_extra(local, sta->key, skb);
 456                 dev_queue_xmit(skb);
 457                 return;
 458         }
 459
 460 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 461         if (net_ratelimit())
 462                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 463                        "queue_len=%d PS=%d @%lu\n",
 464                        wiphy_name(local->hw.wiphy),
 465                        skb_queue_len(&sta->tx_filtered),
 466                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 467 #endif
 468         dev_kfree_skb(skb);
 469 }
 470
 471 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 472 {
 473         struct sk_buff *skb2;
 474         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 475         struct ieee80211_local *local = hw_to_local(hw);
 476         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 477         u16 frag, type;
 478         __le16 fc;
 479         struct ieee80211_supported_band *sband;
 480         struct ieee80211_tx_status_rtap_hdr *rthdr;
 481         struct ieee80211_sub_if_data *sdata;
 482         struct net_device *prev_dev = NULL;
 483         struct sta_info *sta;
 484         int retry_count = -1, i;
 485
 486         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 487                 /* the HW cannot have attempted that rate */
 488                 if (i >= hw->max_rates) {
 489                         info->status.rates[i].idx = -1;
 490                         info->status.rates[i].count = 0;
 491                 }
 492
 493                 retry_count += info->status.rates[i].count;
 494         }
 495         if (retry_count < 0)
 496                 retry_count = 0;
 497
 498         rcu_read_lock();
 499
 500         sband = local->hw.wiphy->bands[info->band];
 501
 502         sta = sta_info_get(local, hdr->addr1);
 503
 504         if (sta) {
 505                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 506                     test_sta_flags(sta, WLAN_STA_PS)) {
 507                         /*
 508                          * The STA is in power save mode, so assume
 509                          * that this TX packet failed because of that.
 510                          */
 511                         ieee80211_handle_filtered_frame(local, sta, skb);
 512                         rcu_read_unlock();
 513                         return;
 514                 }
 515
 516                 fc = hdr->frame_control;
 517
 518                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 519                     (ieee80211_is_data_qos(fc))) {
 520                         u16 tid, ssn;
 521                         u8 *qc;
 522
 523                         qc = ieee80211_get_qos_ctl(hdr);
 524                         tid = qc[0] & 0xf;
 525                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 526                                                 & IEEE80211_SCTL_SEQ);
 527                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 528                                            tid, ssn);
 529                 }
 530
 531                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 532                         ieee80211_handle_filtered_frame(local, sta, skb);
 533                         rcu_read_unlock();
 534                         return;
 535                 } else {
 536                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 537                                 sta->tx_retry_failed++;
 538                         sta->tx_retry_count += retry_count;
 539                 }
 540
 541                 rate_control_tx_status(local, sband, sta, skb);
 542         }
 543
 544         rcu_read_unlock();
 545
 546         ieee80211_led_tx(local, 0);
 547
 548         /* SNMP counters
 549          * Fragments are passed to low-level drivers as separate skbs, so these
 550          * are actually fragments, not frames. Update frame counters only for
 551          * the first fragment of the frame. */
 552
 553         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 554         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 555
 556         if (info->flags & IEEE80211_TX_STAT_ACK) {
 557                 if (frag == 0) {
 558                         local->dot11TransmittedFrameCount++;
 559                         if (is_multicast_ether_addr(hdr->addr1))
 560                                 local->dot11MulticastTransmittedFrameCount++;
 561                         if (retry_count > 0)
 562                                 local->dot11RetryCount++;
 563                         if (retry_count > 1)
 564                                 local->dot11MultipleRetryCount++;
 565                 }
 566
 567                 /* This counter shall be incremented for an acknowledged MPDU
 568                  * with an individual address in the address 1 field or an MPDU
 569                  * with a multicast address in the address 1 field of type Data
 570                  * or Management. */
 571                 if (!is_multicast_ether_addr(hdr->addr1) ||
 572                     type == IEEE80211_FTYPE_DATA ||
 573                     type == IEEE80211_FTYPE_MGMT)
 574                         local->dot11TransmittedFragmentCount++;
 575         } else {
 576                 if (frag == 0)
 577                         local->dot11FailedCount++;
 578         }
 579
 580         /* this was a transmitted frame, but now we want to reuse it */
 581         skb_orphan(skb);
 582
 583         /*
 584          * This is a bit racy but we can avoid a lot of work
 585          * with this test...
 586          */
 587         if (!local->monitors && !local->cooked_mntrs) {
 588                 dev_kfree_skb(skb);
 589                 return;
 590         }
 591
 592         /* send frame to monitor interfaces now */
 593
 594         if (skb_headroom(skb) < sizeof(*rthdr)) {
 595                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 596                 dev_kfree_skb(skb);
 597                 return;
 598         }
 599
 600         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 601                                 skb_push(skb, sizeof(*rthdr));
 602
 603         memset(rthdr, 0, sizeof(*rthdr));
 604         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 605         rthdr->hdr.it_present =
 606                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 607                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 608                             (1 << IEEE80211_RADIOTAP_RATE));
 609
 610         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 611             !is_multicast_ether_addr(hdr->addr1))
 612                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 613
 614         /*
 615          * XXX: Once radiotap gets the bitmap reset thing the vendor
 616          *      extensions proposal contains, we can actually report
 617          *      the whole set of tries we did.
 618          */
 619         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 620             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 621                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 622         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 623                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 624         if (info->status.rates[0].idx >= 0 &&
 625             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 626                 rthdr->rate = sband->bitrates[
 627                                 info->status.rates[0].idx].bitrate / 5;
 628
 629         /* for now report the total retry_count */
 630         rthdr->data_retries = retry_count;
 631
 632         /* XXX: is this sufficient for BPF? */
 633         skb_set_mac_header(skb, 0);
 634         skb->ip_summed = CHECKSUM_UNNECESSARY;
 635         skb->pkt_type = PACKET_OTHERHOST;
 636         skb->protocol = htons(ETH_P_802_2);
 637         memset(skb->cb, 0, sizeof(skb->cb));
 638
 639         rcu_read_lock();
 640         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 641                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 642                         if (!netif_running(sdata->dev))
 643                                 continue;
 644
 645                         if (prev_dev) {
 646                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 647                                 if (skb2) {
 648                                         skb2->dev = prev_dev;
 649                                         netif_rx(skb2);
 650                                 }
 651                         }
 652
 653                         prev_dev = sdata->dev;
 654                 }
 655         }
 656         if (prev_dev) {
 657                 skb->dev = prev_dev;
 658                 netif_rx(skb);
 659                 skb = NULL;
 660         }
 661         rcu_read_unlock();
 662         dev_kfree_skb(skb);
 663 }
 664 EXPORT_SYMBOL(ieee80211_tx_status);
 665
 666 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 667                                         const struct ieee80211_ops *ops)
 668 {
 669         struct ieee80211_local *local;
 670         int priv_size;
 671         struct wiphy *wiphy;
 672
 673         /* Ensure 32-byte alignment of our private data and hw private data.
 674          * We use the wiphy priv data for both our ieee80211_local and for
 675          * the driver's private data
 676          *
 677          * In memory it'll be like this:
 678          *
 679          * +-------------------------+
 680          * | struct wiphy           |
 681          * +-------------------------+
 682          * | struct ieee80211_local  |
 683          * +-------------------------+
 684          * | driver's private data   |
 685          * +-------------------------+
 686          *
 687          */
 688         priv_size = ((sizeof(struct ieee80211_local) +
 689                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 690                     priv_data_len;
 691
 692         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 693
 694         if (!wiphy)
 695                 return NULL;
 696
 697         wiphy->privid = mac80211_wiphy_privid;
 698
 699         local = wiphy_priv(wiphy);
 700         local->hw.wiphy = wiphy;
 701
 702         local->hw.priv = (char *)local +
 703                          ((sizeof(struct ieee80211_local) +
 704                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 705
 706         BUG_ON(!ops->tx);
 707         BUG_ON(!ops->start);
 708         BUG_ON(!ops->stop);
 709         BUG_ON(!ops->config);
 710         BUG_ON(!ops->add_interface);
 711         BUG_ON(!ops->remove_interface);
 712         BUG_ON(!ops->configure_filter);
 713         local->ops = ops;
 714
 715         /* set up some defaults */
 716         local->hw.queues = 1;
 717         local->hw.max_rates = 1;
 718         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 719         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 720         local->hw.conf.long_frame_max_tx_count = 4;
 721         local->hw.conf.short_frame_max_tx_count = 7;
 722         local->hw.conf.radio_enabled = true;
 723
 724         INIT_LIST_HEAD(&local->interfaces);
 725
 726         spin_lock_init(&local->key_lock);
 727
 728         spin_lock_init(&local->queue_stop_reason_lock);
 729
 730         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 731
 732         sta_info_init(local);
 733
 734         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 735                      (unsigned long)local);
 736         tasklet_disable(&local->tx_pending_tasklet);
 737
 738         tasklet_init(&local->tasklet,
 739                      ieee80211_tasklet_handler,
 740                      (unsigned long) local);
 741         tasklet_disable(&local->tasklet);
 742
 743         skb_queue_head_init(&local->skb_queue);
 744         skb_queue_head_init(&local->skb_queue_unreliable);
 745
 746         return local_to_hw(local);
 747 }
 748 EXPORT_SYMBOL(ieee80211_alloc_hw);
 749
 750 int ieee80211_register_hw(struct ieee80211_hw *hw)
 751 {
 752         struct ieee80211_local *local = hw_to_local(hw);
 753         int result;
 754         enum ieee80211_band band;
 755         struct net_device *mdev;
 756         struct ieee80211_master_priv *mpriv;
 757
 758         /*
 759          * generic code guarantees at least one band,
 760          * set this very early because much code assumes
 761          * that hw.conf.channel is assigned
 762          */
 763         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 764                 struct ieee80211_supported_band *sband;
 765
 766                 sband = local->hw.wiphy->bands[band];
 767                 if (sband) {
 768                         /* init channel we're on */
 769                         local->hw.conf.channel =
 770                         local->oper_channel =
 771                         local->scan_channel = &sband->channels[0];
 772                         break;
 773                 }
 774         }
 775
 776         /* if low-level driver supports AP, we also support VLAN */
 777         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 778                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 779
 780         /* mac80211 always supports monitor */
 781         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 782
 783         result = wiphy_register(local->hw.wiphy);
 784         if (result < 0)
 785                 return result;
 786
 787         /*
 788          * We use the number of queues for feature tests (QoS, HT) internally
 789          * so restrict them appropriately.
 790          */
 791         if (hw->queues > IEEE80211_MAX_QUEUES)
 792                 hw->queues = IEEE80211_MAX_QUEUES;
 793         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 794                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 795         if (hw->queues < 4)
 796                 hw->ampdu_queues = 0;
 797
 798         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 799                                "wmaster%d", ether_setup,
 800                                ieee80211_num_queues(hw));
 801         if (!mdev)
 802                 goto fail_mdev_alloc;
 803
 804         mpriv = netdev_priv(mdev);
 805         mpriv->local = local;
 806         local->mdev = mdev;
 807
 808         ieee80211_rx_bss_list_init(local);
 809
 810         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 811         mdev->open = ieee80211_master_open;
 812         mdev->stop = ieee80211_master_stop;
 813         mdev->type = ARPHRD_IEEE80211;
 814         mdev->header_ops = &ieee80211_header_ops;
 815         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 816
 817         local->hw.workqueue =
 818                 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
 819         if (!local->hw.workqueue) {
 820                 result = -ENOMEM;
 821                 goto fail_workqueue;
 822         }
 823
 824         /*
 825          * The hardware needs headroom for sending the frame,
 826          * and we need some headroom for passing the frame to monitor
 827          * interfaces, but never both at the same time.
 828          */
 829         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 830                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 831
 832         debugfs_hw_add(local);
 833
 834         if (local->hw.conf.beacon_int < 10)
 835                 local->hw.conf.beacon_int = 100;
 836
 837         if (local->hw.max_listen_interval == 0)
 838                 local->hw.max_listen_interval = 1;
 839
 840         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 841
 842         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 843                                                   IEEE80211_HW_SIGNAL_DB |
 844                                                   IEEE80211_HW_SIGNAL_DBM) ?
 845                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 846         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 847                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 848         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 849                 local->wstats_flags |= IW_QUAL_DBM;
 850
 851         result = sta_info_start(local);
 852         if (result < 0)
 853                 goto fail_sta_info;
 854
 855         rtnl_lock();
 856         result = dev_alloc_name(local->mdev, local->mdev->name);
 857         if (result < 0)
 858                 goto fail_dev;
 859
 860         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 861         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 862
 863         result = register_netdevice(local->mdev);
 864         if (result < 0)
 865                 goto fail_dev;
 866
 867         result = ieee80211_init_rate_ctrl_alg(local,
 868                                               hw->rate_control_algorithm);
 869         if (result < 0) {
 870                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 871                        "algorithm\n", wiphy_name(local->hw.wiphy));
 872                 goto fail_rate;
 873         }
 874
 875         result = ieee80211_wep_init(local);
 876
 877         if (result < 0) {
 878                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 879                        wiphy_name(local->hw.wiphy), result);
 880                 goto fail_wep;
 881         }
 882
 883         local->mdev->select_queue = ieee80211_select_queue;
 884
 885         /* add one default STA interface if supported */
 886         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 887                 result = ieee80211_if_add(local, "wlan%d", NULL,
 888                                           NL80211_IFTYPE_STATION, NULL);
 889                 if (result)
 890                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 891                                wiphy_name(local->hw.wiphy));
 892         }
 893
 894         rtnl_unlock();
 895
 896         ieee80211_led_init(local);
 897
 898         return 0;
 899
 900 fail_wep:
 901         rate_control_deinitialize(local);
 902 fail_rate:
 903         unregister_netdevice(local->mdev);
 904         local->mdev = NULL;
 905 fail_dev:
 906         rtnl_unlock();
 907         sta_info_stop(local);
 908 fail_sta_info:
 909         debugfs_hw_del(local);
 910         destroy_workqueue(local->hw.workqueue);
 911 fail_workqueue:
 912         if (local->mdev)
 913                 free_netdev(local->mdev);
 914 fail_mdev_alloc:
 915         wiphy_unregister(local->hw.wiphy);
 916         return result;
 917 }
 918 EXPORT_SYMBOL(ieee80211_register_hw);
 919
 920 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 921 {
 922         struct ieee80211_local *local = hw_to_local(hw);
 923
 924         tasklet_kill(&local->tx_pending_tasklet);
 925         tasklet_kill(&local->tasklet);
 926
 927         rtnl_lock();
 928
 929         /*
 930          * At this point, interface list manipulations are fine
 931          * because the driver cannot be handing us frames any
 932          * more and the tasklet is killed.
 933          */
 934
 935         /* First, we remove all virtual interfaces. */
 936         ieee80211_remove_interfaces(local);
 937
 938         /* then, finally, remove the master interface */
 939         unregister_netdevice(local->mdev);
 940
 941         rtnl_unlock();
 942
 943         ieee80211_rx_bss_list_deinit(local);
 944         ieee80211_clear_tx_pending(local);
 945         sta_info_stop(local);
 946         rate_control_deinitialize(local);
 947         debugfs_hw_del(local);
 948
 949         if (skb_queue_len(&local->skb_queue)
 950                         || skb_queue_len(&local->skb_queue_unreliable))
 951                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 952                        wiphy_name(local->hw.wiphy));
 953         skb_queue_purge(&local->skb_queue);
 954         skb_queue_purge(&local->skb_queue_unreliable);
 955
 956         destroy_workqueue(local->hw.workqueue);
 957         wiphy_unregister(local->hw.wiphy);
 958         ieee80211_wep_free(local);
 959         ieee80211_led_exit(local);
 960         free_netdev(local->mdev);
 961 }
 962 EXPORT_SYMBOL(ieee80211_unregister_hw);
 963
 964 void ieee80211_free_hw(struct ieee80211_hw *hw)
 965 {
 966         struct ieee80211_local *local = hw_to_local(hw);
 967
 968         wiphy_free(local->hw.wiphy);
 969 }
 970 EXPORT_SYMBOL(ieee80211_free_hw);
 971
 972 static int __init ieee80211_init(void)
 973 {
 974         struct sk_buff *skb;
 975         int ret;
 976
 977         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 978         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 979                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 980
 981         ret = rc80211_minstrel_init();
 982         if (ret)
 983                 return ret;
 984
 985         ret = rc80211_pid_init();
 986         if (ret)
 987                 return ret;
 988
 989         ieee80211_debugfs_netdev_init();
 990
 991         return 0;
 992 }
 993
 994 static void __exit ieee80211_exit(void)
 995 {
 996         rc80211_pid_exit();
 997         rc80211_minstrel_exit();
 998
 999         /*
1000          * For key todo, it'll be empty by now but the work
1001          * might still be scheduled.
1002          */
1003         flush_scheduled_work();
1004
1005         if (mesh_allocated)
1006                 ieee80211s_stop();
1007
1008         ieee80211_debugfs_netdev_exit();
1009 }
1010
1011
1012 subsys_initcall(ieee80211_init);
1013 module_exit(ieee80211_exit);
1014
1015 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1016 MODULE_LICENSE("GPL");