SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         u8 rate;
  45         u8 padding_for_rate;
  46         __le16 tx_flags;
  47         u8 data_retries;
  48 } __attribute__ ((packed));
  49
  50
  51 /* must be called under mdev tx lock */
  52 void ieee80211_configure_filter(struct ieee80211_local *local)
  53 {
  54         unsigned int changed_flags;
  55         unsigned int new_flags = 0;
  56
  57         if (atomic_read(&local->iff_promiscs))
  58                 new_flags |= FIF_PROMISC_IN_BSS;
  59
  60         if (atomic_read(&local->iff_allmultis))
  61                 new_flags |= FIF_ALLMULTI;
  62
  63         if (local->monitors)
  64                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  65
  66         if (local->fif_fcsfail)
  67                 new_flags |= FIF_FCSFAIL;
  68
  69         if (local->fif_plcpfail)
  70                 new_flags |= FIF_PLCPFAIL;
  71
  72         if (local->fif_control)
  73                 new_flags |= FIF_CONTROL;
  74
  75         if (local->fif_other_bss)
  76                 new_flags |= FIF_OTHER_BSS;
  77
  78         changed_flags = local->filter_flags ^ new_flags;
  79
  80         /* be a bit nasty */
  81         new_flags |= (1<<31);
  82
  83         local->ops->configure_filter(local_to_hw(local),
  84                                      changed_flags, &new_flags,
  85                                      local->mdev->mc_count,
  86                                      local->mdev->mc_list);
  87
  88         WARN_ON(new_flags & (1<<31));
  89
  90         local->filter_flags = new_flags & ~(1<<31);
  91 }
  92
  93 /* master interface */
  94
  95 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  96 {
  97         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  98         return ETH_ALEN;
  99 }
 100
 101 static const struct header_ops ieee80211_header_ops = {
 102         .create         = eth_header,
 103         .parse          = header_parse_80211,
 104         .rebuild        = eth_rebuild_header,
 105         .cache          = eth_header_cache,
 106         .cache_update   = eth_header_cache_update,
 107 };
 108
 109 static int ieee80211_master_open(struct net_device *dev)
 110 {
 111         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 112         struct ieee80211_local *local = mpriv->local;
 113         struct ieee80211_sub_if_data *sdata;
 114         int res = -EOPNOTSUPP;
 115
 116         /* we hold the RTNL here so can safely walk the list */
 117         list_for_each_entry(sdata, &local->interfaces, list) {
 118                 if (netif_running(sdata->dev)) {
 119                         res = 0;
 120                         break;
 121                 }
 122         }
 123
 124         if (res)
 125                 return res;
 126
 127         netif_tx_start_all_queues(local->mdev);
 128
 129         return 0;
 130 }
 131
 132 static int ieee80211_master_stop(struct net_device *dev)
 133 {
 134         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 135         struct ieee80211_local *local = mpriv->local;
 136         struct ieee80211_sub_if_data *sdata;
 137
 138         /* we hold the RTNL here so can safely walk the list */
 139         list_for_each_entry(sdata, &local->interfaces, list)
 140                 if (netif_running(sdata->dev))
 141                         dev_close(sdata->dev);
 142
 143         return 0;
 144 }
 145
 146 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 147 {
 148         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 149         struct ieee80211_local *local = mpriv->local;
 150
 151         ieee80211_configure_filter(local);
 152 }
 153
 154 /* everything else */
 155
 156 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 157 {
 158         struct ieee80211_local *local = sdata->local;
 159         struct ieee80211_if_conf conf;
 160
 161         if (WARN_ON(!netif_running(sdata->dev)))
 162                 return 0;
 163
 164         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 165                 return -EINVAL;
 166
 167         if (!local->ops->config_interface)
 168                 return 0;
 169
 170         memset(&conf, 0, sizeof(conf));
 171         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                 static const 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.channel_type) {
 212                 local->hw.conf.channel = chan;
 213                 local->hw.conf.channel_type = channel_type;
 214                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 215         }
 216
 217         if (local->sw_scanning)
 218                 power = chan->max_power;
 219         else
 220                 power = local->power_constr_level ?
 221                         (chan->max_power - local->power_constr_level) :
 222                         chan->max_power;
 223
 224         if (local->user_power_level)
 225                 power = min(power, local->user_power_level);
 226
 227         if (local->hw.conf.power_level != power) {
 228                 changed |= IEEE80211_CONF_CHANGE_POWER;
 229                 local->hw.conf.power_level = power;
 230         }
 231
 232         if (changed && local->open_count) {
 233                 ret = local->ops->config(local_to_hw(local), changed);
 234                 /*
 235                  * Goal:
 236                  * HW reconfiguration should never fail, the driver has told
 237                  * us what it can support so it should live up to that promise.
 238                  *
 239                  * Current status:
 240                  * rfkill is not integrated with mac80211 and a
 241                  * configuration command can thus fail if hardware rfkill
 242                  * is enabled
 243                  *
 244                  * FIXME: integrate rfkill with mac80211 and then add this
 245                  * WARN_ON() back
 246                  *
 247                  */
 248                 /* WARN_ON(ret); */
 249         }
 250
 251         return ret;
 252 }
 253
 254 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 255                                       u32 changed)
 256 {
 257         struct ieee80211_local *local = sdata->local;
 258
 259         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 260                 return;
 261
 262         if (!changed)
 263                 return;
 264
 265         if (local->ops->bss_info_changed)
 266                 local->ops->bss_info_changed(local_to_hw(local),
 267                                              &sdata->vif,
 268                                              &sdata->vif.bss_conf,
 269                                              changed);
 270 }
 271
 272 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 273 {
 274         sdata->vif.bss_conf.use_cts_prot = false;
 275         sdata->vif.bss_conf.use_short_preamble = false;
 276         sdata->vif.bss_conf.use_short_slot = false;
 277         return BSS_CHANGED_ERP_CTS_PROT |
 278                BSS_CHANGED_ERP_PREAMBLE |
 279                BSS_CHANGED_ERP_SLOT;
 280 }
 281
 282 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 283                                  struct sk_buff *skb)
 284 {
 285         struct ieee80211_local *local = hw_to_local(hw);
 286         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 287         int tmp;
 288
 289         skb->dev = local->mdev;
 290         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 291         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 292                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 293         tmp = skb_queue_len(&local->skb_queue) +
 294                 skb_queue_len(&local->skb_queue_unreliable);
 295         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 296                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 297                 dev_kfree_skb_irq(skb);
 298                 tmp--;
 299                 I802_DEBUG_INC(local->tx_status_drop);
 300         }
 301         tasklet_schedule(&local->tasklet);
 302 }
 303 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 304
 305 static void ieee80211_tasklet_handler(unsigned long data)
 306 {
 307         struct ieee80211_local *local = (struct ieee80211_local *) data;
 308         struct sk_buff *skb;
 309         struct ieee80211_rx_status rx_status;
 310         struct ieee80211_ra_tid *ra_tid;
 311
 312         while ((skb = skb_dequeue(&local->skb_queue)) ||
 313                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 314                 switch (skb->pkt_type) {
 315                 case IEEE80211_RX_MSG:
 316                         /* status is in skb->cb */
 317                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 318                         /* Clear skb->pkt_type in order to not confuse kernel
 319                          * netstack. */
 320                         skb->pkt_type = 0;
 321                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 322                         break;
 323                 case IEEE80211_TX_STATUS_MSG:
 324                         skb->pkt_type = 0;
 325                         ieee80211_tx_status(local_to_hw(local), skb);
 326                         break;
 327                 case IEEE80211_DELBA_MSG:
 328                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 329                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 330                                                 ra_tid->ra, ra_tid->tid);
 331                         dev_kfree_skb(skb);
 332                         break;
 333                 case IEEE80211_ADDBA_MSG:
 334                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 335                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 336                                                  ra_tid->ra, ra_tid->tid);
 337                         dev_kfree_skb(skb);
 338                         break ;
 339                 default:
 340                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 341                              skb->pkt_type);
 342                         dev_kfree_skb(skb);
 343                         break;
 344                 }
 345         }
 346 }
 347
 348 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 349  * make a prepared TX frame (one that has been given to hw) to look like brand
 350  * new IEEE 802.11 frame that is ready to go through TX processing again.
 351  */
 352 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 353                                       struct ieee80211_key *key,
 354                                       struct sk_buff *skb)
 355 {
 356         unsigned int hdrlen, iv_len, mic_len;
 357         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 358
 359         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 360
 361         if (!key)
 362                 goto no_key;
 363
 364         switch (key->conf.alg) {
 365         case ALG_WEP:
 366                 iv_len = WEP_IV_LEN;
 367                 mic_len = WEP_ICV_LEN;
 368                 break;
 369         case ALG_TKIP:
 370                 iv_len = TKIP_IV_LEN;
 371                 mic_len = TKIP_ICV_LEN;
 372                 break;
 373         case ALG_CCMP:
 374                 iv_len = CCMP_HDR_LEN;
 375                 mic_len = CCMP_MIC_LEN;
 376                 break;
 377         default:
 378                 goto no_key;
 379         }
 380
 381         if (skb->len >= hdrlen + mic_len &&
 382             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 383                 skb_trim(skb, skb->len - mic_len);
 384         if (skb->len >= hdrlen + iv_len) {
 385                 memmove(skb->data + iv_len, skb->data, hdrlen);
 386                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 387         }
 388
 389 no_key:
 390         if (ieee80211_is_data_qos(hdr->frame_control)) {
 391                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 392                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 393                         hdrlen - IEEE80211_QOS_CTL_LEN);
 394                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 395         }
 396 }
 397
 398 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 399                                             struct sta_info *sta,
 400                                             struct sk_buff *skb)
 401 {
 402         sta->tx_filtered_count++;
 403
 404         /*
 405          * Clear the TX filter mask for this STA when sending the next
 406          * packet. If the STA went to power save mode, this will happen
 407          * when it wakes up for the next time.
 408          */
 409         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 410
 411         /*
 412          * This code races in the following way:
 413          *
 414          *  (1) STA sends frame indicating it will go to sleep and does so
 415          *  (2) hardware/firmware adds STA to filter list, passes frame up
 416          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 417          *  (4) we get TX status before having processed the frame and
 418          *      knowing that the STA has gone to sleep.
 419          *
 420          * This is actually quite unlikely even when both those events are
 421          * processed from interrupts coming in quickly after one another or
 422          * even at the same time because we queue both TX status events and
 423          * RX frames to be processed by a tasklet and process them in the
 424          * same order that they were received or TX status last. Hence, there
 425          * is no race as long as the frame RX is processed before the next TX
 426          * status, which drivers can ensure, see below.
 427          *
 428          * Note that this can only happen if the hardware or firmware can
 429          * actually add STAs to the filter list, if this is done by the
 430          * driver in response to set_tim() (which will only reduce the race
 431          * this whole filtering tries to solve, not completely solve it)
 432          * this situation cannot happen.
 433          *
 434          * To completely solve this race drivers need to make sure that they
 435          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 436          *      functions and
 437          *  (b) always process RX events before TX status events if ordering
 438          *      can be unknown, for example with different interrupt status
 439          *      bits.
 440          */
 441         if (test_sta_flags(sta, WLAN_STA_PS) &&
 442             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 443                 ieee80211_remove_tx_extra(local, sta->key, skb);
 444                 skb_queue_tail(&sta->tx_filtered, skb);
 445                 return;
 446         }
 447
 448         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 449                 /* Software retry the packet once */
 450                 skb->requeue = 1;
 451                 ieee80211_remove_tx_extra(local, sta->key, skb);
 452                 dev_queue_xmit(skb);
 453                 return;
 454         }
 455
 456 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 457         if (net_ratelimit())
 458                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 459                        "queue_len=%d PS=%d @%lu\n",
 460                        wiphy_name(local->hw.wiphy),
 461                        skb_queue_len(&sta->tx_filtered),
 462                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 463 #endif
 464         dev_kfree_skb(skb);
 465 }
 466
 467 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 468 {
 469         struct sk_buff *skb2;
 470         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 471         struct ieee80211_local *local = hw_to_local(hw);
 472         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 473         u16 frag, type;
 474         __le16 fc;
 475         struct ieee80211_supported_band *sband;
 476         struct ieee80211_tx_status_rtap_hdr *rthdr;
 477         struct ieee80211_sub_if_data *sdata;
 478         struct net_device *prev_dev = NULL;
 479         struct sta_info *sta;
 480         int retry_count = -1, i;
 481
 482         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 483                 /* the HW cannot have attempted that rate */
 484                 if (i >= hw->max_rates) {
 485                         info->status.rates[i].idx = -1;
 486                         info->status.rates[i].count = 0;
 487                 }
 488
 489                 retry_count += info->status.rates[i].count;
 490         }
 491         if (retry_count < 0)
 492                 retry_count = 0;
 493
 494         rcu_read_lock();
 495
 496         sband = local->hw.wiphy->bands[info->band];
 497
 498         sta = sta_info_get(local, hdr->addr1);
 499
 500         if (sta) {
 501                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 502                     test_sta_flags(sta, WLAN_STA_PS)) {
 503                         /*
 504                          * The STA is in power save mode, so assume
 505                          * that this TX packet failed because of that.
 506                          */
 507                         ieee80211_handle_filtered_frame(local, sta, skb);
 508                         rcu_read_unlock();
 509                         return;
 510                 }
 511
 512                 fc = hdr->frame_control;
 513
 514                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 515                     (ieee80211_is_data_qos(fc))) {
 516                         u16 tid, ssn;
 517                         u8 *qc;
 518
 519                         qc = ieee80211_get_qos_ctl(hdr);
 520                         tid = qc[0] & 0xf;
 521                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 522                                                 & IEEE80211_SCTL_SEQ);
 523                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 524                                            tid, ssn);
 525                 }
 526
 527                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 528                         ieee80211_handle_filtered_frame(local, sta, skb);
 529                         rcu_read_unlock();
 530                         return;
 531                 } else {
 532                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 533                                 sta->tx_retry_failed++;
 534                         sta->tx_retry_count += retry_count;
 535                 }
 536
 537                 rate_control_tx_status(local, sband, sta, skb);
 538         }
 539
 540         rcu_read_unlock();
 541
 542         ieee80211_led_tx(local, 0);
 543
 544         /* SNMP counters
 545          * Fragments are passed to low-level drivers as separate skbs, so these
 546          * are actually fragments, not frames. Update frame counters only for
 547          * the first fragment of the frame. */
 548
 549         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 550         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 551
 552         if (info->flags & IEEE80211_TX_STAT_ACK) {
 553                 if (frag == 0) {
 554                         local->dot11TransmittedFrameCount++;
 555                         if (is_multicast_ether_addr(hdr->addr1))
 556                                 local->dot11MulticastTransmittedFrameCount++;
 557                         if (retry_count > 0)
 558                                 local->dot11RetryCount++;
 559                         if (retry_count > 1)
 560                                 local->dot11MultipleRetryCount++;
 561                 }
 562
 563                 /* This counter shall be incremented for an acknowledged MPDU
 564                  * with an individual address in the address 1 field or an MPDU
 565                  * with a multicast address in the address 1 field of type Data
 566                  * or Management. */
 567                 if (!is_multicast_ether_addr(hdr->addr1) ||
 568                     type == IEEE80211_FTYPE_DATA ||
 569                     type == IEEE80211_FTYPE_MGMT)
 570                         local->dot11TransmittedFragmentCount++;
 571         } else {
 572                 if (frag == 0)
 573                         local->dot11FailedCount++;
 574         }
 575
 576         /* this was a transmitted frame, but now we want to reuse it */
 577         skb_orphan(skb);
 578
 579         /*
 580          * This is a bit racy but we can avoid a lot of work
 581          * with this test...
 582          */
 583         if (!local->monitors && !local->cooked_mntrs) {
 584                 dev_kfree_skb(skb);
 585                 return;
 586         }
 587
 588         /* send frame to monitor interfaces now */
 589
 590         if (skb_headroom(skb) < sizeof(*rthdr)) {
 591                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 592                 dev_kfree_skb(skb);
 593                 return;
 594         }
 595
 596         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 597                                 skb_push(skb, sizeof(*rthdr));
 598
 599         memset(rthdr, 0, sizeof(*rthdr));
 600         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 601         rthdr->hdr.it_present =
 602                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 603                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 604                             (1 << IEEE80211_RADIOTAP_RATE));
 605
 606         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 607             !is_multicast_ether_addr(hdr->addr1))
 608                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 609
 610         /*
 611          * XXX: Once radiotap gets the bitmap reset thing the vendor
 612          *      extensions proposal contains, we can actually report
 613          *      the whole set of tries we did.
 614          */
 615         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 616             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 617                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 618         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 619                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 620         if (info->status.rates[0].idx >= 0 &&
 621             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 622                 rthdr->rate = sband->bitrates[
 623                                 info->status.rates[0].idx].bitrate / 5;
 624
 625         /* for now report the total retry_count */
 626         rthdr->data_retries = retry_count;
 627
 628         /* XXX: is this sufficient for BPF? */
 629         skb_set_mac_header(skb, 0);
 630         skb->ip_summed = CHECKSUM_UNNECESSARY;
 631         skb->pkt_type = PACKET_OTHERHOST;
 632         skb->protocol = htons(ETH_P_802_2);
 633         memset(skb->cb, 0, sizeof(skb->cb));
 634
 635         rcu_read_lock();
 636         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 637                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 638                         if (!netif_running(sdata->dev))
 639                                 continue;
 640
 641                         if (prev_dev) {
 642                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 643                                 if (skb2) {
 644                                         skb2->dev = prev_dev;
 645                                         netif_rx(skb2);
 646                                 }
 647                         }
 648
 649                         prev_dev = sdata->dev;
 650                 }
 651         }
 652         if (prev_dev) {
 653                 skb->dev = prev_dev;
 654                 netif_rx(skb);
 655                 skb = NULL;
 656         }
 657         rcu_read_unlock();
 658         dev_kfree_skb(skb);
 659 }
 660 EXPORT_SYMBOL(ieee80211_tx_status);
 661
 662 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 663                                         const struct ieee80211_ops *ops)
 664 {
 665         struct ieee80211_local *local;
 666         int priv_size;
 667         struct wiphy *wiphy;
 668
 669         /* Ensure 32-byte alignment of our private data and hw private data.
 670          * We use the wiphy priv data for both our ieee80211_local and for
 671          * the driver's private data
 672          *
 673          * In memory it'll be like this:
 674          *
 675          * +-------------------------+
 676          * | struct wiphy           |
 677          * +-------------------------+
 678          * | struct ieee80211_local  |
 679          * +-------------------------+
 680          * | driver's private data   |
 681          * +-------------------------+
 682          *
 683          */
 684         priv_size = ((sizeof(struct ieee80211_local) +
 685                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 686                     priv_data_len;
 687
 688         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 689
 690         if (!wiphy)
 691                 return NULL;
 692
 693         wiphy->privid = mac80211_wiphy_privid;
 694
 695         local = wiphy_priv(wiphy);
 696         local->hw.wiphy = wiphy;
 697
 698         local->hw.priv = (char *)local +
 699                          ((sizeof(struct ieee80211_local) +
 700                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 701
 702         BUG_ON(!ops->tx);
 703         BUG_ON(!ops->start);
 704         BUG_ON(!ops->stop);
 705         BUG_ON(!ops->config);
 706         BUG_ON(!ops->add_interface);
 707         BUG_ON(!ops->remove_interface);
 708         BUG_ON(!ops->configure_filter);
 709         local->ops = ops;
 710
 711         /* set up some defaults */
 712         local->hw.queues = 1;
 713         local->hw.max_rates = 1;
 714         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 715         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 716         local->hw.conf.long_frame_max_tx_count = 4;
 717         local->hw.conf.short_frame_max_tx_count = 7;
 718         local->hw.conf.radio_enabled = true;
 719
 720         INIT_LIST_HEAD(&local->interfaces);
 721
 722         spin_lock_init(&local->key_lock);
 723
 724         spin_lock_init(&local->queue_stop_reason_lock);
 725
 726         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 727
 728         INIT_WORK(&local->dynamic_ps_enable_work,
 729                   ieee80211_dynamic_ps_enable_work);
 730         INIT_WORK(&local->dynamic_ps_disable_work,
 731                   ieee80211_dynamic_ps_disable_work);
 732         setup_timer(&local->dynamic_ps_timer,
 733                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 734
 735         sta_info_init(local);
 736
 737         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 738                      (unsigned long)local);
 739         tasklet_disable(&local->tx_pending_tasklet);
 740
 741         tasklet_init(&local->tasklet,
 742                      ieee80211_tasklet_handler,
 743                      (unsigned long) local);
 744         tasklet_disable(&local->tasklet);
 745
 746         skb_queue_head_init(&local->skb_queue);
 747         skb_queue_head_init(&local->skb_queue_unreliable);
 748
 749         return local_to_hw(local);
 750 }
 751 EXPORT_SYMBOL(ieee80211_alloc_hw);
 752
 753 int ieee80211_register_hw(struct ieee80211_hw *hw)
 754 {
 755         struct ieee80211_local *local = hw_to_local(hw);
 756         int result;
 757         enum ieee80211_band band;
 758         struct net_device *mdev;
 759         struct ieee80211_master_priv *mpriv;
 760
 761         /*
 762          * generic code guarantees at least one band,
 763          * set this very early because much code assumes
 764          * that hw.conf.channel is assigned
 765          */
 766         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 767                 struct ieee80211_supported_band *sband;
 768
 769                 sband = local->hw.wiphy->bands[band];
 770                 if (sband) {
 771                         /* init channel we're on */
 772                         local->hw.conf.channel =
 773                         local->oper_channel =
 774                         local->scan_channel = &sband->channels[0];
 775                         break;
 776                 }
 777         }
 778
 779         /* if low-level driver supports AP, we also support VLAN */
 780         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 781                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 782
 783         /* mac80211 always supports monitor */
 784         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 785
 786         result = wiphy_register(local->hw.wiphy);
 787         if (result < 0)
 788                 return result;
 789
 790         /*
 791          * We use the number of queues for feature tests (QoS, HT) internally
 792          * so restrict them appropriately.
 793          */
 794         if (hw->queues > IEEE80211_MAX_QUEUES)
 795                 hw->queues = IEEE80211_MAX_QUEUES;
 796         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 797                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 798         if (hw->queues < 4)
 799                 hw->ampdu_queues = 0;
 800
 801         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 802                                "wmaster%d", ether_setup,
 803                                ieee80211_num_queues(hw));
 804         if (!mdev)
 805                 goto fail_mdev_alloc;
 806
 807         mpriv = netdev_priv(mdev);
 808         mpriv->local = local;
 809         local->mdev = mdev;
 810
 811         ieee80211_rx_bss_list_init(local);
 812
 813         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 814         mdev->open = ieee80211_master_open;
 815         mdev->stop = ieee80211_master_stop;
 816         mdev->type = ARPHRD_IEEE80211;
 817         mdev->header_ops = &ieee80211_header_ops;
 818         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 819
 820         local->hw.workqueue =
 821                 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
 822         if (!local->hw.workqueue) {
 823                 result = -ENOMEM;
 824                 goto fail_workqueue;
 825         }
 826
 827         /*
 828          * The hardware needs headroom for sending the frame,
 829          * and we need some headroom for passing the frame to monitor
 830          * interfaces, but never both at the same time.
 831          */
 832         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 833                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 834
 835         debugfs_hw_add(local);
 836
 837         if (local->hw.conf.beacon_int < 10)
 838                 local->hw.conf.beacon_int = 100;
 839
 840         if (local->hw.max_listen_interval == 0)
 841                 local->hw.max_listen_interval = 1;
 842
 843         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 844
 845         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 846                                                   IEEE80211_HW_SIGNAL_DB |
 847                                                   IEEE80211_HW_SIGNAL_DBM) ?
 848                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 849         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 850                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 851         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 852                 local->wstats_flags |= IW_QUAL_DBM;
 853
 854         result = sta_info_start(local);
 855         if (result < 0)
 856                 goto fail_sta_info;
 857
 858         rtnl_lock();
 859         result = dev_alloc_name(local->mdev, local->mdev->name);
 860         if (result < 0)
 861                 goto fail_dev;
 862
 863         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 864         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 865
 866         result = register_netdevice(local->mdev);
 867         if (result < 0)
 868                 goto fail_dev;
 869
 870         result = ieee80211_init_rate_ctrl_alg(local,
 871                                               hw->rate_control_algorithm);
 872         if (result < 0) {
 873                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 874                        "algorithm\n", wiphy_name(local->hw.wiphy));
 875                 goto fail_rate;
 876         }
 877
 878         result = ieee80211_wep_init(local);
 879
 880         if (result < 0) {
 881                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 882                        wiphy_name(local->hw.wiphy), result);
 883                 goto fail_wep;
 884         }
 885
 886         local->mdev->select_queue = ieee80211_select_queue;
 887
 888         /* add one default STA interface if supported */
 889         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 890                 result = ieee80211_if_add(local, "wlan%d", NULL,
 891                                           NL80211_IFTYPE_STATION, NULL);
 892                 if (result)
 893                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 894                                wiphy_name(local->hw.wiphy));
 895         }
 896
 897         rtnl_unlock();
 898
 899         ieee80211_led_init(local);
 900
 901         return 0;
 902
 903 fail_wep:
 904         rate_control_deinitialize(local);
 905 fail_rate:
 906         unregister_netdevice(local->mdev);
 907         local->mdev = NULL;
 908 fail_dev:
 909         rtnl_unlock();
 910         sta_info_stop(local);
 911 fail_sta_info:
 912         debugfs_hw_del(local);
 913         destroy_workqueue(local->hw.workqueue);
 914 fail_workqueue:
 915         if (local->mdev)
 916                 free_netdev(local->mdev);
 917 fail_mdev_alloc:
 918         wiphy_unregister(local->hw.wiphy);
 919         return result;
 920 }
 921 EXPORT_SYMBOL(ieee80211_register_hw);
 922
 923 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 924 {
 925         struct ieee80211_local *local = hw_to_local(hw);
 926
 927         tasklet_kill(&local->tx_pending_tasklet);
 928         tasklet_kill(&local->tasklet);
 929
 930         rtnl_lock();
 931
 932         /*
 933          * At this point, interface list manipulations are fine
 934          * because the driver cannot be handing us frames any
 935          * more and the tasklet is killed.
 936          */
 937
 938         /* First, we remove all virtual interfaces. */
 939         ieee80211_remove_interfaces(local);
 940
 941         /* then, finally, remove the master interface */
 942         unregister_netdevice(local->mdev);
 943
 944         rtnl_unlock();
 945
 946         ieee80211_rx_bss_list_deinit(local);
 947         ieee80211_clear_tx_pending(local);
 948         sta_info_stop(local);
 949         rate_control_deinitialize(local);
 950         debugfs_hw_del(local);
 951
 952         if (skb_queue_len(&local->skb_queue)
 953                         || skb_queue_len(&local->skb_queue_unreliable))
 954                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 955                        wiphy_name(local->hw.wiphy));
 956         skb_queue_purge(&local->skb_queue);
 957         skb_queue_purge(&local->skb_queue_unreliable);
 958
 959         destroy_workqueue(local->hw.workqueue);
 960         wiphy_unregister(local->hw.wiphy);
 961         ieee80211_wep_free(local);
 962         ieee80211_led_exit(local);
 963         free_netdev(local->mdev);
 964 }
 965 EXPORT_SYMBOL(ieee80211_unregister_hw);
 966
 967 void ieee80211_free_hw(struct ieee80211_hw *hw)
 968 {
 969         struct ieee80211_local *local = hw_to_local(hw);
 970
 971         wiphy_free(local->hw.wiphy);
 972 }
 973 EXPORT_SYMBOL(ieee80211_free_hw);
 974
 975 static int __init ieee80211_init(void)
 976 {
 977         struct sk_buff *skb;
 978         int ret;
 979
 980         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 981         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 982                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 983
 984         ret = rc80211_minstrel_init();
 985         if (ret)
 986                 return ret;
 987
 988         ret = rc80211_pid_init();
 989         if (ret)
 990                 return ret;
 991
 992         ieee80211_debugfs_netdev_init();
 993
 994         return 0;
 995 }
 996
 997 static void __exit ieee80211_exit(void)
 998 {
 999         rc80211_pid_exit();
1000         rc80211_minstrel_exit();
1001
1002         /*
1003          * For key todo, it'll be empty by now but the work
1004          * might still be scheduled.
1005          */
1006         flush_scheduled_work();
1007
1008         if (mesh_allocated)
1009                 ieee80211s_stop();
1010
1011         ieee80211_debugfs_netdev_exit();
1012 }
1013
1014
1015 subsys_initcall(ieee80211_init);
1016 module_exit(ieee80211_exit);
1017
1018 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1019 MODULE_LICENSE("GPL");