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         __le16 tx_flags;
  45         u8 data_retries;
  46 } __attribute__ ((packed));
  47
  48
  49 /* must be called under mdev tx lock */
  50 void ieee80211_configure_filter(struct ieee80211_local *local)
  51 {
  52         unsigned int changed_flags;
  53         unsigned int new_flags = 0;
  54
  55         if (atomic_read(&local->iff_promiscs))
  56                 new_flags |= FIF_PROMISC_IN_BSS;
  57
  58         if (atomic_read(&local->iff_allmultis))
  59                 new_flags |= FIF_ALLMULTI;
  60
  61         if (local->monitors)
  62                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  63
  64         if (local->fif_fcsfail)
  65                 new_flags |= FIF_FCSFAIL;
  66
  67         if (local->fif_plcpfail)
  68                 new_flags |= FIF_PLCPFAIL;
  69
  70         if (local->fif_control)
  71                 new_flags |= FIF_CONTROL;
  72
  73         if (local->fif_other_bss)
  74                 new_flags |= FIF_OTHER_BSS;
  75
  76         changed_flags = local->filter_flags ^ new_flags;
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         local->ops->configure_filter(local_to_hw(local),
  82                                      changed_flags, &new_flags,
  83                                      local->mdev->mc_count,
  84                                      local->mdev->mc_list);
  85
  86         WARN_ON(new_flags & (1<<31));
  87
  88         local->filter_flags = new_flags & ~(1<<31);
  89 }
  90
  91 /* master interface */
  92
  93 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  94 {
  95         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  96         return ETH_ALEN;
  97 }
  98
  99 static const struct header_ops ieee80211_header_ops = {
 100         .create         = eth_header,
 101         .parse          = header_parse_80211,
 102         .rebuild        = eth_rebuild_header,
 103         .cache          = eth_header_cache,
 104         .cache_update   = eth_header_cache_update,
 105 };
 106
 107 static int ieee80211_master_open(struct net_device *dev)
 108 {
 109         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 110         struct ieee80211_local *local = mpriv->local;
 111         struct ieee80211_sub_if_data *sdata;
 112         int res = -EOPNOTSUPP;
 113
 114         /* we hold the RTNL here so can safely walk the list */
 115         list_for_each_entry(sdata, &local->interfaces, list) {
 116                 if (netif_running(sdata->dev)) {
 117                         res = 0;
 118                         break;
 119                 }
 120         }
 121
 122         if (res)
 123                 return res;
 124
 125         netif_tx_start_all_queues(local->mdev);
 126
 127         return 0;
 128 }
 129
 130 static int ieee80211_master_stop(struct net_device *dev)
 131 {
 132         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 133         struct ieee80211_local *local = mpriv->local;
 134         struct ieee80211_sub_if_data *sdata;
 135
 136         /* we hold the RTNL here so can safely walk the list */
 137         list_for_each_entry(sdata, &local->interfaces, list)
 138                 if (netif_running(sdata->dev))
 139                         dev_close(sdata->dev);
 140
 141         return 0;
 142 }
 143
 144 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 145 {
 146         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 147         struct ieee80211_local *local = mpriv->local;
 148
 149         ieee80211_configure_filter(local);
 150 }
 151
 152 /* everything else */
 153
 154 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 155 {
 156         struct ieee80211_local *local = sdata->local;
 157         struct ieee80211_if_conf conf;
 158
 159         if (WARN_ON(!netif_running(sdata->dev)))
 160                 return 0;
 161
 162         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 163                 return -EINVAL;
 164
 165         if (!local->ops->config_interface)
 166                 return 0;
 167
 168         memset(&conf, 0, sizeof(conf));
 169         conf.changed = changed;
 170
 171         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 172             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 173                 conf.bssid = sdata->u.sta.bssid;
 174                 conf.ssid = sdata->u.sta.ssid;
 175                 conf.ssid_len = sdata->u.sta.ssid_len;
 176         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 177                 conf.bssid = sdata->dev->dev_addr;
 178                 conf.ssid = sdata->u.ap.ssid;
 179                 conf.ssid_len = sdata->u.ap.ssid_len;
 180         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 181                 u8 zero[ETH_ALEN] = { 0 };
 182                 conf.bssid = zero;
 183                 conf.ssid = zero;
 184                 conf.ssid_len = 0;
 185         } else {
 186                 WARN_ON(1);
 187                 return -EINVAL;
 188         }
 189
 190         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 191                 return -EINVAL;
 192
 193         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 194                 return -EINVAL;
 195
 196         return local->ops->config_interface(local_to_hw(local),
 197                                             &sdata->vif, &conf);
 198 }
 199
 200 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 201 {
 202         struct ieee80211_channel *chan;
 203         int ret = 0;
 204         int power;
 205
 206         if (local->sw_scanning)
 207                 chan = local->scan_channel;
 208         else
 209                 chan = local->oper_channel;
 210
 211         if (chan != local->hw.conf.channel) {
 212                 local->hw.conf.channel = chan;
 213                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 214         }
 215
 216
 217         if (!local->hw.conf.power_level)
 218                 power = chan->max_power;
 219         else
 220                 power = min(chan->max_power, local->hw.conf.power_level);
 221         if (local->hw.conf.power_level != power) {
 222                 changed |= IEEE80211_CONF_CHANGE_POWER;
 223                 local->hw.conf.power_level = power;
 224         }
 225
 226         if (changed && local->open_count) {
 227                 ret = local->ops->config(local_to_hw(local), changed);
 228                 /*
 229                  * HW reconfiguration should never fail, the driver has told
 230                  * us what it can support so it should live up to that promise.
 231                  */
 232                 WARN_ON(ret);
 233         }
 234
 235         return ret;
 236 }
 237
 238 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 239                                       u32 changed)
 240 {
 241         struct ieee80211_local *local = sdata->local;
 242
 243         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 244                 return;
 245
 246         if (!changed)
 247                 return;
 248
 249         if (local->ops->bss_info_changed)
 250                 local->ops->bss_info_changed(local_to_hw(local),
 251                                              &sdata->vif,
 252                                              &sdata->bss_conf,
 253                                              changed);
 254 }
 255
 256 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 257 {
 258         sdata->bss_conf.use_cts_prot = false;
 259         sdata->bss_conf.use_short_preamble = false;
 260         sdata->bss_conf.use_short_slot = false;
 261         return BSS_CHANGED_ERP_CTS_PROT |
 262                BSS_CHANGED_ERP_PREAMBLE |
 263                BSS_CHANGED_ERP_SLOT;
 264 }
 265
 266 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 267                                  struct sk_buff *skb)
 268 {
 269         struct ieee80211_local *local = hw_to_local(hw);
 270         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 271         int tmp;
 272
 273         skb->dev = local->mdev;
 274         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 275         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 276                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 277         tmp = skb_queue_len(&local->skb_queue) +
 278                 skb_queue_len(&local->skb_queue_unreliable);
 279         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 280                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 281                 dev_kfree_skb_irq(skb);
 282                 tmp--;
 283                 I802_DEBUG_INC(local->tx_status_drop);
 284         }
 285         tasklet_schedule(&local->tasklet);
 286 }
 287 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 288
 289 static void ieee80211_tasklet_handler(unsigned long data)
 290 {
 291         struct ieee80211_local *local = (struct ieee80211_local *) data;
 292         struct sk_buff *skb;
 293         struct ieee80211_rx_status rx_status;
 294         struct ieee80211_ra_tid *ra_tid;
 295
 296         while ((skb = skb_dequeue(&local->skb_queue)) ||
 297                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 298                 switch (skb->pkt_type) {
 299                 case IEEE80211_RX_MSG:
 300                         /* status is in skb->cb */
 301                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 302                         /* Clear skb->pkt_type in order to not confuse kernel
 303                          * netstack. */
 304                         skb->pkt_type = 0;
 305                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 306                         break;
 307                 case IEEE80211_TX_STATUS_MSG:
 308                         skb->pkt_type = 0;
 309                         ieee80211_tx_status(local_to_hw(local), skb);
 310                         break;
 311                 case IEEE80211_DELBA_MSG:
 312                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 313                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 314                                                 ra_tid->ra, ra_tid->tid);
 315                         dev_kfree_skb(skb);
 316                         break;
 317                 case IEEE80211_ADDBA_MSG:
 318                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 319                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 320                                                  ra_tid->ra, ra_tid->tid);
 321                         dev_kfree_skb(skb);
 322                         break ;
 323                 default:
 324                         WARN_ON(1);
 325                         dev_kfree_skb(skb);
 326                         break;
 327                 }
 328         }
 329 }
 330
 331 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 332  * make a prepared TX frame (one that has been given to hw) to look like brand
 333  * new IEEE 802.11 frame that is ready to go through TX processing again.
 334  */
 335 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 336                                       struct ieee80211_key *key,
 337                                       struct sk_buff *skb)
 338 {
 339         unsigned int hdrlen, iv_len, mic_len;
 340         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 341
 342         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 343
 344         if (!key)
 345                 goto no_key;
 346
 347         switch (key->conf.alg) {
 348         case ALG_WEP:
 349                 iv_len = WEP_IV_LEN;
 350                 mic_len = WEP_ICV_LEN;
 351                 break;
 352         case ALG_TKIP:
 353                 iv_len = TKIP_IV_LEN;
 354                 mic_len = TKIP_ICV_LEN;
 355                 break;
 356         case ALG_CCMP:
 357                 iv_len = CCMP_HDR_LEN;
 358                 mic_len = CCMP_MIC_LEN;
 359                 break;
 360         default:
 361                 goto no_key;
 362         }
 363
 364         if (skb->len >= hdrlen + mic_len &&
 365             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 366                 skb_trim(skb, skb->len - mic_len);
 367         if (skb->len >= hdrlen + iv_len) {
 368                 memmove(skb->data + iv_len, skb->data, hdrlen);
 369                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 370         }
 371
 372 no_key:
 373         if (ieee80211_is_data_qos(hdr->frame_control)) {
 374                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 375                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 376                         hdrlen - IEEE80211_QOS_CTL_LEN);
 377                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 378         }
 379 }
 380
 381 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 382                                             struct sta_info *sta,
 383                                             struct sk_buff *skb)
 384 {
 385         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 386
 387         sta->tx_filtered_count++;
 388
 389         /*
 390          * Clear the TX filter mask for this STA when sending the next
 391          * packet. If the STA went to power save mode, this will happen
 392          * when it wakes up for the next time.
 393          */
 394         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 395
 396         /*
 397          * This code races in the following way:
 398          *
 399          *  (1) STA sends frame indicating it will go to sleep and does so
 400          *  (2) hardware/firmware adds STA to filter list, passes frame up
 401          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 402          *  (4) we get TX status before having processed the frame and
 403          *      knowing that the STA has gone to sleep.
 404          *
 405          * This is actually quite unlikely even when both those events are
 406          * processed from interrupts coming in quickly after one another or
 407          * even at the same time because we queue both TX status events and
 408          * RX frames to be processed by a tasklet and process them in the
 409          * same order that they were received or TX status last. Hence, there
 410          * is no race as long as the frame RX is processed before the next TX
 411          * status, which drivers can ensure, see below.
 412          *
 413          * Note that this can only happen if the hardware or firmware can
 414          * actually add STAs to the filter list, if this is done by the
 415          * driver in response to set_tim() (which will only reduce the race
 416          * this whole filtering tries to solve, not completely solve it)
 417          * this situation cannot happen.
 418          *
 419          * To completely solve this race drivers need to make sure that they
 420          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 421          *      functions and
 422          *  (b) always process RX events before TX status events if ordering
 423          *      can be unknown, for example with different interrupt status
 424          *      bits.
 425          */
 426         if (test_sta_flags(sta, WLAN_STA_PS) &&
 427             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 428                 ieee80211_remove_tx_extra(local, sta->key, skb);
 429                 skb_queue_tail(&sta->tx_filtered, skb);
 430                 return;
 431         }
 432
 433         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 434             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
 435                 /* Software retry the packet once */
 436                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 437                 ieee80211_remove_tx_extra(local, sta->key, skb);
 438                 dev_queue_xmit(skb);
 439                 return;
 440         }
 441
 442 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 443         if (net_ratelimit())
 444                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 445                        "queue_len=%d PS=%d @%lu\n",
 446                        wiphy_name(local->hw.wiphy),
 447                        skb_queue_len(&sta->tx_filtered),
 448                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 449 #endif
 450         dev_kfree_skb(skb);
 451 }
 452
 453 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 454 {
 455         struct sk_buff *skb2;
 456         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 457         struct ieee80211_local *local = hw_to_local(hw);
 458         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 459         u16 frag, type;
 460         __le16 fc;
 461         struct ieee80211_supported_band *sband;
 462         struct ieee80211_tx_status_rtap_hdr *rthdr;
 463         struct ieee80211_sub_if_data *sdata;
 464         struct net_device *prev_dev = NULL;
 465         struct sta_info *sta;
 466
 467         rcu_read_lock();
 468
 469         sta = sta_info_get(local, hdr->addr1);
 470
 471         if (sta) {
 472                 if (info->status.excessive_retries &&
 473                     test_sta_flags(sta, WLAN_STA_PS)) {
 474                         /*
 475                          * The STA is in power save mode, so assume
 476                          * that this TX packet failed because of that.
 477                          */
 478                         ieee80211_handle_filtered_frame(local, sta, skb);
 479                         rcu_read_unlock();
 480                         return;
 481                 }
 482
 483                 fc = hdr->frame_control;
 484
 485                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 486                     (ieee80211_is_data_qos(fc))) {
 487                         u16 tid, ssn;
 488                         u8 *qc;
 489
 490                         qc = ieee80211_get_qos_ctl(hdr);
 491                         tid = qc[0] & 0xf;
 492                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 493                                                 & IEEE80211_SCTL_SEQ);
 494                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 495                                            tid, ssn);
 496                 }
 497
 498                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 499                         ieee80211_handle_filtered_frame(local, sta, skb);
 500                         rcu_read_unlock();
 501                         return;
 502                 } else {
 503                         if (info->status.excessive_retries)
 504                                 sta->tx_retry_failed++;
 505                         sta->tx_retry_count += info->status.retry_count;
 506                 }
 507
 508                 sband = local->hw.wiphy->bands[info->band];
 509                 rate_control_tx_status(local, sband, sta, skb);
 510         }
 511
 512         rcu_read_unlock();
 513
 514         ieee80211_led_tx(local, 0);
 515
 516         /* SNMP counters
 517          * Fragments are passed to low-level drivers as separate skbs, so these
 518          * are actually fragments, not frames. Update frame counters only for
 519          * the first fragment of the frame. */
 520
 521         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 522         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 523
 524         if (info->flags & IEEE80211_TX_STAT_ACK) {
 525                 if (frag == 0) {
 526                         local->dot11TransmittedFrameCount++;
 527                         if (is_multicast_ether_addr(hdr->addr1))
 528                                 local->dot11MulticastTransmittedFrameCount++;
 529                         if (info->status.retry_count > 0)
 530                                 local->dot11RetryCount++;
 531                         if (info->status.retry_count > 1)
 532                                 local->dot11MultipleRetryCount++;
 533                 }
 534
 535                 /* This counter shall be incremented for an acknowledged MPDU
 536                  * with an individual address in the address 1 field or an MPDU
 537                  * with a multicast address in the address 1 field of type Data
 538                  * or Management. */
 539                 if (!is_multicast_ether_addr(hdr->addr1) ||
 540                     type == IEEE80211_FTYPE_DATA ||
 541                     type == IEEE80211_FTYPE_MGMT)
 542                         local->dot11TransmittedFragmentCount++;
 543         } else {
 544                 if (frag == 0)
 545                         local->dot11FailedCount++;
 546         }
 547
 548         /* this was a transmitted frame, but now we want to reuse it */
 549         skb_orphan(skb);
 550
 551         /*
 552          * This is a bit racy but we can avoid a lot of work
 553          * with this test...
 554          */
 555         if (!local->monitors && !local->cooked_mntrs) {
 556                 dev_kfree_skb(skb);
 557                 return;
 558         }
 559
 560         /* send frame to monitor interfaces now */
 561
 562         if (skb_headroom(skb) < sizeof(*rthdr)) {
 563                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 564                 dev_kfree_skb(skb);
 565                 return;
 566         }
 567
 568         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 569                                 skb_push(skb, sizeof(*rthdr));
 570
 571         memset(rthdr, 0, sizeof(*rthdr));
 572         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 573         rthdr->hdr.it_present =
 574                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 575                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 576
 577         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 578             !is_multicast_ether_addr(hdr->addr1))
 579                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 580
 581         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
 582             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
 583                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 584         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
 585                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 586
 587         rthdr->data_retries = info->status.retry_count;
 588
 589         /* XXX: is this sufficient for BPF? */
 590         skb_set_mac_header(skb, 0);
 591         skb->ip_summed = CHECKSUM_UNNECESSARY;
 592         skb->pkt_type = PACKET_OTHERHOST;
 593         skb->protocol = htons(ETH_P_802_2);
 594         memset(skb->cb, 0, sizeof(skb->cb));
 595
 596         rcu_read_lock();
 597         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 598                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 599                         if (!netif_running(sdata->dev))
 600                                 continue;
 601
 602                         if (prev_dev) {
 603                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 604                                 if (skb2) {
 605                                         skb2->dev = prev_dev;
 606                                         netif_rx(skb2);
 607                                 }
 608                         }
 609
 610                         prev_dev = sdata->dev;
 611                 }
 612         }
 613         if (prev_dev) {
 614                 skb->dev = prev_dev;
 615                 netif_rx(skb);
 616                 skb = NULL;
 617         }
 618         rcu_read_unlock();
 619         dev_kfree_skb(skb);
 620 }
 621 EXPORT_SYMBOL(ieee80211_tx_status);
 622
 623 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 624                                         const struct ieee80211_ops *ops)
 625 {
 626         struct ieee80211_local *local;
 627         int priv_size;
 628         struct wiphy *wiphy;
 629
 630         /* Ensure 32-byte alignment of our private data and hw private data.
 631          * We use the wiphy priv data for both our ieee80211_local and for
 632          * the driver's private data
 633          *
 634          * In memory it'll be like this:
 635          *
 636          * +-------------------------+
 637          * | struct wiphy           |
 638          * +-------------------------+
 639          * | struct ieee80211_local  |
 640          * +-------------------------+
 641          * | driver's private data   |
 642          * +-------------------------+
 643          *
 644          */
 645         priv_size = ((sizeof(struct ieee80211_local) +
 646                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 647                     priv_data_len;
 648
 649         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 650
 651         if (!wiphy)
 652                 return NULL;
 653
 654         wiphy->privid = mac80211_wiphy_privid;
 655
 656         local = wiphy_priv(wiphy);
 657         local->hw.wiphy = wiphy;
 658
 659         local->hw.priv = (char *)local +
 660                          ((sizeof(struct ieee80211_local) +
 661                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 662
 663         BUG_ON(!ops->tx);
 664         BUG_ON(!ops->start);
 665         BUG_ON(!ops->stop);
 666         BUG_ON(!ops->config);
 667         BUG_ON(!ops->add_interface);
 668         BUG_ON(!ops->remove_interface);
 669         BUG_ON(!ops->configure_filter);
 670         local->ops = ops;
 671
 672         local->hw.queues = 1; /* default */
 673
 674         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 675         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 676         local->hw.conf.long_frame_max_tx_count = 4;
 677         local->hw.conf.short_frame_max_tx_count = 7;
 678         local->hw.conf.radio_enabled = true;
 679
 680         INIT_LIST_HEAD(&local->interfaces);
 681
 682         spin_lock_init(&local->key_lock);
 683
 684         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 685
 686         sta_info_init(local);
 687
 688         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 689                      (unsigned long)local);
 690         tasklet_disable(&local->tx_pending_tasklet);
 691
 692         tasklet_init(&local->tasklet,
 693                      ieee80211_tasklet_handler,
 694                      (unsigned long) local);
 695         tasklet_disable(&local->tasklet);
 696
 697         skb_queue_head_init(&local->skb_queue);
 698         skb_queue_head_init(&local->skb_queue_unreliable);
 699
 700         return local_to_hw(local);
 701 }
 702 EXPORT_SYMBOL(ieee80211_alloc_hw);
 703
 704 int ieee80211_register_hw(struct ieee80211_hw *hw)
 705 {
 706         struct ieee80211_local *local = hw_to_local(hw);
 707         const char *name;
 708         int result;
 709         enum ieee80211_band band;
 710         struct net_device *mdev;
 711         struct ieee80211_master_priv *mpriv;
 712
 713         /*
 714          * generic code guarantees at least one band,
 715          * set this very early because much code assumes
 716          * that hw.conf.channel is assigned
 717          */
 718         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 719                 struct ieee80211_supported_band *sband;
 720
 721                 sband = local->hw.wiphy->bands[band];
 722                 if (sband) {
 723                         /* init channel we're on */
 724                         local->hw.conf.channel =
 725                         local->oper_channel =
 726                         local->scan_channel = &sband->channels[0];
 727                         break;
 728                 }
 729         }
 730
 731         /* if low-level driver supports AP, we also support VLAN */
 732         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 733                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 734
 735         /* mac80211 always supports monitor */
 736         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 737
 738         result = wiphy_register(local->hw.wiphy);
 739         if (result < 0)
 740                 return result;
 741
 742         /*
 743          * We use the number of queues for feature tests (QoS, HT) internally
 744          * so restrict them appropriately.
 745          */
 746         if (hw->queues > IEEE80211_MAX_QUEUES)
 747                 hw->queues = IEEE80211_MAX_QUEUES;
 748         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 749                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 750         if (hw->queues < 4)
 751                 hw->ampdu_queues = 0;
 752
 753         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 754                                "wmaster%d", ether_setup,
 755                                ieee80211_num_queues(hw));
 756         if (!mdev)
 757                 goto fail_mdev_alloc;
 758
 759         mpriv = netdev_priv(mdev);
 760         mpriv->local = local;
 761         local->mdev = mdev;
 762
 763         ieee80211_rx_bss_list_init(local);
 764
 765         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 766         mdev->open = ieee80211_master_open;
 767         mdev->stop = ieee80211_master_stop;
 768         mdev->type = ARPHRD_IEEE80211;
 769         mdev->header_ops = &ieee80211_header_ops;
 770         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 771
 772         name = wiphy_dev(local->hw.wiphy)->driver->name;
 773         local->hw.workqueue = create_freezeable_workqueue(name);
 774         if (!local->hw.workqueue) {
 775                 result = -ENOMEM;
 776                 goto fail_workqueue;
 777         }
 778
 779         /*
 780          * The hardware needs headroom for sending the frame,
 781          * and we need some headroom for passing the frame to monitor
 782          * interfaces, but never both at the same time.
 783          */
 784         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 785                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 786
 787         debugfs_hw_add(local);
 788
 789         if (local->hw.conf.beacon_int < 10)
 790                 local->hw.conf.beacon_int = 100;
 791
 792         if (local->hw.max_listen_interval == 0)
 793                 local->hw.max_listen_interval = 1;
 794
 795         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 796
 797         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 798                                                   IEEE80211_HW_SIGNAL_DB |
 799                                                   IEEE80211_HW_SIGNAL_DBM) ?
 800                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 801         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 802                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 803         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 804                 local->wstats_flags |= IW_QUAL_DBM;
 805
 806         result = sta_info_start(local);
 807         if (result < 0)
 808                 goto fail_sta_info;
 809
 810         rtnl_lock();
 811         result = dev_alloc_name(local->mdev, local->mdev->name);
 812         if (result < 0)
 813                 goto fail_dev;
 814
 815         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 816         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 817
 818         result = register_netdevice(local->mdev);
 819         if (result < 0)
 820                 goto fail_dev;
 821
 822         result = ieee80211_init_rate_ctrl_alg(local,
 823                                               hw->rate_control_algorithm);
 824         if (result < 0) {
 825                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 826                        "algorithm\n", wiphy_name(local->hw.wiphy));
 827                 goto fail_rate;
 828         }
 829
 830         result = ieee80211_wep_init(local);
 831
 832         if (result < 0) {
 833                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 834                        wiphy_name(local->hw.wiphy), result);
 835                 goto fail_wep;
 836         }
 837
 838         local->mdev->select_queue = ieee80211_select_queue;
 839
 840         /* add one default STA interface */
 841         result = ieee80211_if_add(local, "wlan%d", NULL,
 842                                   NL80211_IFTYPE_STATION, NULL);
 843         if (result)
 844                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 845                        wiphy_name(local->hw.wiphy));
 846
 847         rtnl_unlock();
 848
 849         ieee80211_led_init(local);
 850
 851         return 0;
 852
 853 fail_wep:
 854         rate_control_deinitialize(local);
 855 fail_rate:
 856         unregister_netdevice(local->mdev);
 857         local->mdev = NULL;
 858 fail_dev:
 859         rtnl_unlock();
 860         sta_info_stop(local);
 861 fail_sta_info:
 862         debugfs_hw_del(local);
 863         destroy_workqueue(local->hw.workqueue);
 864 fail_workqueue:
 865         if (local->mdev)
 866                 free_netdev(local->mdev);
 867 fail_mdev_alloc:
 868         wiphy_unregister(local->hw.wiphy);
 869         return result;
 870 }
 871 EXPORT_SYMBOL(ieee80211_register_hw);
 872
 873 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 874 {
 875         struct ieee80211_local *local = hw_to_local(hw);
 876
 877         tasklet_kill(&local->tx_pending_tasklet);
 878         tasklet_kill(&local->tasklet);
 879
 880         rtnl_lock();
 881
 882         /*
 883          * At this point, interface list manipulations are fine
 884          * because the driver cannot be handing us frames any
 885          * more and the tasklet is killed.
 886          */
 887
 888         /* First, we remove all virtual interfaces. */
 889         ieee80211_remove_interfaces(local);
 890
 891         /* then, finally, remove the master interface */
 892         unregister_netdevice(local->mdev);
 893
 894         rtnl_unlock();
 895
 896         ieee80211_rx_bss_list_deinit(local);
 897         ieee80211_clear_tx_pending(local);
 898         sta_info_stop(local);
 899         rate_control_deinitialize(local);
 900         debugfs_hw_del(local);
 901
 902         if (skb_queue_len(&local->skb_queue)
 903                         || skb_queue_len(&local->skb_queue_unreliable))
 904                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 905                        wiphy_name(local->hw.wiphy));
 906         skb_queue_purge(&local->skb_queue);
 907         skb_queue_purge(&local->skb_queue_unreliable);
 908
 909         destroy_workqueue(local->hw.workqueue);
 910         wiphy_unregister(local->hw.wiphy);
 911         ieee80211_wep_free(local);
 912         ieee80211_led_exit(local);
 913         free_netdev(local->mdev);
 914 }
 915 EXPORT_SYMBOL(ieee80211_unregister_hw);
 916
 917 void ieee80211_free_hw(struct ieee80211_hw *hw)
 918 {
 919         struct ieee80211_local *local = hw_to_local(hw);
 920
 921         wiphy_free(local->hw.wiphy);
 922 }
 923 EXPORT_SYMBOL(ieee80211_free_hw);
 924
 925 static int __init ieee80211_init(void)
 926 {
 927         struct sk_buff *skb;
 928         int ret;
 929
 930         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 931         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 932                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 933
 934         ret = rc80211_minstrel_init();
 935         if (ret)
 936                 return ret;
 937
 938         ret = rc80211_pid_init();
 939         if (ret)
 940                 return ret;
 941
 942         ieee80211_debugfs_netdev_init();
 943
 944         return 0;
 945 }
 946
 947 static void __exit ieee80211_exit(void)
 948 {
 949         rc80211_pid_exit();
 950         rc80211_minstrel_exit();
 951
 952         /*
 953          * For key todo, it'll be empty by now but the work
 954          * might still be scheduled.
 955          */
 956         flush_scheduled_work();
 957
 958         if (mesh_allocated)
 959                 ieee80211s_stop();
 960
 961         ieee80211_debugfs_netdev_exit();
 962 }
 963
 964
 965 subsys_initcall(ieee80211_init);
 966 module_exit(ieee80211_exit);
 967
 968 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 969 MODULE_LICENSE("GPL");