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