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)
 201 {
 202         struct ieee80211_channel *chan;
 203         int ret = 0;
 204
 205         if (local->sw_scanning)
 206                 chan = local->scan_channel;
 207         else
 208                 chan = local->oper_channel;
 209
 210         local->hw.conf.channel = chan;
 211
 212         if (!local->hw.conf.power_level)
 213                 local->hw.conf.power_level = chan->max_power;
 214         else
 215                 local->hw.conf.power_level = min(chan->max_power,
 216                                                local->hw.conf.power_level);
 217
 218         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
 219
 220 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 221         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 222                wiphy_name(local->hw.wiphy), chan->center_freq);
 223 #endif
 224
 225         if (local->open_count)
 226                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 227
 228         return ret;
 229 }
 230
 231 /**
 232  * ieee80211_handle_ht should be used only after legacy configuration
 233  * has been determined namely band, as ht configuration depends upon
 234  * the hardware's HT abilities for a _specific_ band.
 235  */
 236 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 237                            struct ieee80211_ht_info *req_ht_cap,
 238                            struct ieee80211_ht_bss_info *req_bss_cap)
 239 {
 240         struct ieee80211_conf *conf = &local->hw.conf;
 241         struct ieee80211_supported_band *sband;
 242         struct ieee80211_ht_info ht_conf;
 243         struct ieee80211_ht_bss_info ht_bss_conf;
 244         u32 changed = 0;
 245         int i;
 246         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
 247         u8 tx_mcs_set_cap;
 248
 249         sband = local->hw.wiphy->bands[conf->channel->band];
 250
 251         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
 252         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
 253
 254         /* HT is not supported */
 255         if (!sband->ht_info.ht_supported) {
 256                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 257                 goto out;
 258         }
 259
 260         /* disable HT */
 261         if (!enable_ht) {
 262                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
 263                         changed |= BSS_CHANGED_HT;
 264                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 265                 conf->ht_conf.ht_supported = 0;
 266                 goto out;
 267         }
 268
 269
 270         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
 271                 changed |= BSS_CHANGED_HT;
 272
 273         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 274         ht_conf.ht_supported = 1;
 275
 276         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
 277         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
 278         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
 279         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
 280         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 281         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 282
 283         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 284         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 285
 286         /* Bits 96-100 */
 287         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
 288
 289         /* configure suppoerted Tx MCS according to requested MCS
 290          * (based in most cases on Rx capabilities of peer) and self
 291          * Tx MCS capabilities (as defined by low level driver HW
 292          * Tx capabilities) */
 293         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
 294                 goto check_changed;
 295
 296         /* Counting from 0 therfore + 1 */
 297         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
 298                 max_tx_streams = ((tx_mcs_set_cap &
 299                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
 300
 301         for (i = 0; i < max_tx_streams; i++)
 302                 ht_conf.supp_mcs_set[i] =
 303                         sband->ht_info.supp_mcs_set[i] &
 304                                         req_ht_cap->supp_mcs_set[i];
 305
 306         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
 307                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
 308                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
 309                         ht_conf.supp_mcs_set[i] =
 310                                 sband->ht_info.supp_mcs_set[i] &
 311                                         req_ht_cap->supp_mcs_set[i];
 312
 313 check_changed:
 314         /* if bss configuration changed store the new one */
 315         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
 316             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
 317                 changed |= BSS_CHANGED_HT;
 318                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
 319                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
 320         }
 321 out:
 322         return changed;
 323 }
 324
 325 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 326                                       u32 changed)
 327 {
 328         struct ieee80211_local *local = sdata->local;
 329
 330         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 331                 return;
 332
 333         if (!changed)
 334                 return;
 335
 336         if (local->ops->bss_info_changed)
 337                 local->ops->bss_info_changed(local_to_hw(local),
 338                                              &sdata->vif,
 339                                              &sdata->bss_conf,
 340                                              changed);
 341 }
 342
 343 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 344 {
 345         sdata->bss_conf.use_cts_prot = 0;
 346         sdata->bss_conf.use_short_preamble = 0;
 347         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
 348 }
 349
 350 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 351                                  struct sk_buff *skb)
 352 {
 353         struct ieee80211_local *local = hw_to_local(hw);
 354         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 355         int tmp;
 356
 357         skb->dev = local->mdev;
 358         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 359         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 360                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 361         tmp = skb_queue_len(&local->skb_queue) +
 362                 skb_queue_len(&local->skb_queue_unreliable);
 363         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 364                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 365                 dev_kfree_skb_irq(skb);
 366                 tmp--;
 367                 I802_DEBUG_INC(local->tx_status_drop);
 368         }
 369         tasklet_schedule(&local->tasklet);
 370 }
 371 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 372
 373 static void ieee80211_tasklet_handler(unsigned long data)
 374 {
 375         struct ieee80211_local *local = (struct ieee80211_local *) data;
 376         struct sk_buff *skb;
 377         struct ieee80211_rx_status rx_status;
 378         struct ieee80211_ra_tid *ra_tid;
 379
 380         while ((skb = skb_dequeue(&local->skb_queue)) ||
 381                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 382                 switch (skb->pkt_type) {
 383                 case IEEE80211_RX_MSG:
 384                         /* status is in skb->cb */
 385                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 386                         /* Clear skb->pkt_type in order to not confuse kernel
 387                          * netstack. */
 388                         skb->pkt_type = 0;
 389                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 390                         break;
 391                 case IEEE80211_TX_STATUS_MSG:
 392                         skb->pkt_type = 0;
 393                         ieee80211_tx_status(local_to_hw(local), skb);
 394                         break;
 395                 case IEEE80211_DELBA_MSG:
 396                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 397                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 398                                                 ra_tid->ra, ra_tid->tid);
 399                         dev_kfree_skb(skb);
 400                         break;
 401                 case IEEE80211_ADDBA_MSG:
 402                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 403                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 404                                                  ra_tid->ra, ra_tid->tid);
 405                         dev_kfree_skb(skb);
 406                         break ;
 407                 default:
 408                         WARN_ON(1);
 409                         dev_kfree_skb(skb);
 410                         break;
 411                 }
 412         }
 413 }
 414
 415 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 416  * make a prepared TX frame (one that has been given to hw) to look like brand
 417  * new IEEE 802.11 frame that is ready to go through TX processing again.
 418  */
 419 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 420                                       struct ieee80211_key *key,
 421                                       struct sk_buff *skb)
 422 {
 423         unsigned int hdrlen, iv_len, mic_len;
 424         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 425
 426         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 427
 428         if (!key)
 429                 goto no_key;
 430
 431         switch (key->conf.alg) {
 432         case ALG_WEP:
 433                 iv_len = WEP_IV_LEN;
 434                 mic_len = WEP_ICV_LEN;
 435                 break;
 436         case ALG_TKIP:
 437                 iv_len = TKIP_IV_LEN;
 438                 mic_len = TKIP_ICV_LEN;
 439                 break;
 440         case ALG_CCMP:
 441                 iv_len = CCMP_HDR_LEN;
 442                 mic_len = CCMP_MIC_LEN;
 443                 break;
 444         default:
 445                 goto no_key;
 446         }
 447
 448         if (skb->len >= hdrlen + mic_len &&
 449             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 450                 skb_trim(skb, skb->len - mic_len);
 451         if (skb->len >= hdrlen + iv_len) {
 452                 memmove(skb->data + iv_len, skb->data, hdrlen);
 453                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 454         }
 455
 456 no_key:
 457         if (ieee80211_is_data_qos(hdr->frame_control)) {
 458                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 459                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 460                         hdrlen - IEEE80211_QOS_CTL_LEN);
 461                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 462         }
 463 }
 464
 465 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 466                                             struct sta_info *sta,
 467                                             struct sk_buff *skb)
 468 {
 469         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 470
 471         sta->tx_filtered_count++;
 472
 473         /*
 474          * Clear the TX filter mask for this STA when sending the next
 475          * packet. If the STA went to power save mode, this will happen
 476          * when it wakes up for the next time.
 477          */
 478         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 479
 480         /*
 481          * This code races in the following way:
 482          *
 483          *  (1) STA sends frame indicating it will go to sleep and does so
 484          *  (2) hardware/firmware adds STA to filter list, passes frame up
 485          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 486          *  (4) we get TX status before having processed the frame and
 487          *      knowing that the STA has gone to sleep.
 488          *
 489          * This is actually quite unlikely even when both those events are
 490          * processed from interrupts coming in quickly after one another or
 491          * even at the same time because we queue both TX status events and
 492          * RX frames to be processed by a tasklet and process them in the
 493          * same order that they were received or TX status last. Hence, there
 494          * is no race as long as the frame RX is processed before the next TX
 495          * status, which drivers can ensure, see below.
 496          *
 497          * Note that this can only happen if the hardware or firmware can
 498          * actually add STAs to the filter list, if this is done by the
 499          * driver in response to set_tim() (which will only reduce the race
 500          * this whole filtering tries to solve, not completely solve it)
 501          * this situation cannot happen.
 502          *
 503          * To completely solve this race drivers need to make sure that they
 504          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 505          *      functions and
 506          *  (b) always process RX events before TX status events if ordering
 507          *      can be unknown, for example with different interrupt status
 508          *      bits.
 509          */
 510         if (test_sta_flags(sta, WLAN_STA_PS) &&
 511             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 512                 ieee80211_remove_tx_extra(local, sta->key, skb);
 513                 skb_queue_tail(&sta->tx_filtered, skb);
 514                 return;
 515         }
 516
 517         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 518             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
 519                 /* Software retry the packet once */
 520                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 521                 ieee80211_remove_tx_extra(local, sta->key, skb);
 522                 dev_queue_xmit(skb);
 523                 return;
 524         }
 525
 526 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 527         if (net_ratelimit())
 528                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 529                        "queue_len=%d PS=%d @%lu\n",
 530                        wiphy_name(local->hw.wiphy),
 531                        skb_queue_len(&sta->tx_filtered),
 532                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 533 #endif
 534         dev_kfree_skb(skb);
 535 }
 536
 537 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 538 {
 539         struct sk_buff *skb2;
 540         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 541         struct ieee80211_local *local = hw_to_local(hw);
 542         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 543         u16 frag, type;
 544         __le16 fc;
 545         struct ieee80211_tx_status_rtap_hdr *rthdr;
 546         struct ieee80211_sub_if_data *sdata;
 547         struct net_device *prev_dev = NULL;
 548         struct sta_info *sta;
 549
 550         rcu_read_lock();
 551
 552         sta = sta_info_get(local, hdr->addr1);
 553
 554         if (sta) {
 555                 if (info->status.excessive_retries &&
 556                     test_sta_flags(sta, WLAN_STA_PS)) {
 557                         /*
 558                          * The STA is in power save mode, so assume
 559                          * that this TX packet failed because of that.
 560                          */
 561                         ieee80211_handle_filtered_frame(local, sta, skb);
 562                         rcu_read_unlock();
 563                         return;
 564                 }
 565
 566                 fc = hdr->frame_control;
 567
 568                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 569                     (ieee80211_is_data_qos(fc))) {
 570                         u16 tid, ssn;
 571                         u8 *qc;
 572
 573                         qc = ieee80211_get_qos_ctl(hdr);
 574                         tid = qc[0] & 0xf;
 575                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 576                                                 & IEEE80211_SCTL_SEQ);
 577                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 578                                            tid, ssn);
 579                 }
 580
 581                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 582                         ieee80211_handle_filtered_frame(local, sta, skb);
 583                         rcu_read_unlock();
 584                         return;
 585                 } else {
 586                         if (info->status.excessive_retries)
 587                                 sta->tx_retry_failed++;
 588                         sta->tx_retry_count += info->status.retry_count;
 589                 }
 590
 591                 rate_control_tx_status(local->mdev, skb);
 592         }
 593
 594         rcu_read_unlock();
 595
 596         ieee80211_led_tx(local, 0);
 597
 598         /* SNMP counters
 599          * Fragments are passed to low-level drivers as separate skbs, so these
 600          * are actually fragments, not frames. Update frame counters only for
 601          * the first fragment of the frame. */
 602
 603         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 604         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 605
 606         if (info->flags & IEEE80211_TX_STAT_ACK) {
 607                 if (frag == 0) {
 608                         local->dot11TransmittedFrameCount++;
 609                         if (is_multicast_ether_addr(hdr->addr1))
 610                                 local->dot11MulticastTransmittedFrameCount++;
 611                         if (info->status.retry_count > 0)
 612                                 local->dot11RetryCount++;
 613                         if (info->status.retry_count > 1)
 614                                 local->dot11MultipleRetryCount++;
 615                 }
 616
 617                 /* This counter shall be incremented for an acknowledged MPDU
 618                  * with an individual address in the address 1 field or an MPDU
 619                  * with a multicast address in the address 1 field of type Data
 620                  * or Management. */
 621                 if (!is_multicast_ether_addr(hdr->addr1) ||
 622                     type == IEEE80211_FTYPE_DATA ||
 623                     type == IEEE80211_FTYPE_MGMT)
 624                         local->dot11TransmittedFragmentCount++;
 625         } else {
 626                 if (frag == 0)
 627                         local->dot11FailedCount++;
 628         }
 629
 630         /* this was a transmitted frame, but now we want to reuse it */
 631         skb_orphan(skb);
 632
 633         /*
 634          * This is a bit racy but we can avoid a lot of work
 635          * with this test...
 636          */
 637         if (!local->monitors && !local->cooked_mntrs) {
 638                 dev_kfree_skb(skb);
 639                 return;
 640         }
 641
 642         /* send frame to monitor interfaces now */
 643
 644         if (skb_headroom(skb) < sizeof(*rthdr)) {
 645                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 646                 dev_kfree_skb(skb);
 647                 return;
 648         }
 649
 650         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 651                                 skb_push(skb, sizeof(*rthdr));
 652
 653         memset(rthdr, 0, sizeof(*rthdr));
 654         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 655         rthdr->hdr.it_present =
 656                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 657                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 658
 659         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 660             !is_multicast_ether_addr(hdr->addr1))
 661                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 662
 663         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
 664             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
 665                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 666         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
 667                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 668
 669         rthdr->data_retries = info->status.retry_count;
 670
 671         /* XXX: is this sufficient for BPF? */
 672         skb_set_mac_header(skb, 0);
 673         skb->ip_summed = CHECKSUM_UNNECESSARY;
 674         skb->pkt_type = PACKET_OTHERHOST;
 675         skb->protocol = htons(ETH_P_802_2);
 676         memset(skb->cb, 0, sizeof(skb->cb));
 677
 678         rcu_read_lock();
 679         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 680                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 681                         if (!netif_running(sdata->dev))
 682                                 continue;
 683
 684                         if (prev_dev) {
 685                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 686                                 if (skb2) {
 687                                         skb2->dev = prev_dev;
 688                                         netif_rx(skb2);
 689                                 }
 690                         }
 691
 692                         prev_dev = sdata->dev;
 693                 }
 694         }
 695         if (prev_dev) {
 696                 skb->dev = prev_dev;
 697                 netif_rx(skb);
 698                 skb = NULL;
 699         }
 700         rcu_read_unlock();
 701         dev_kfree_skb(skb);
 702 }
 703 EXPORT_SYMBOL(ieee80211_tx_status);
 704
 705 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 706                                         const struct ieee80211_ops *ops)
 707 {
 708         struct ieee80211_local *local;
 709         int priv_size;
 710         struct wiphy *wiphy;
 711
 712         /* Ensure 32-byte alignment of our private data and hw private data.
 713          * We use the wiphy priv data for both our ieee80211_local and for
 714          * the driver's private data
 715          *
 716          * In memory it'll be like this:
 717          *
 718          * +-------------------------+
 719          * | struct wiphy           |
 720          * +-------------------------+
 721          * | struct ieee80211_local  |
 722          * +-------------------------+
 723          * | driver's private data   |
 724          * +-------------------------+
 725          *
 726          */
 727         priv_size = ((sizeof(struct ieee80211_local) +
 728                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 729                     priv_data_len;
 730
 731         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 732
 733         if (!wiphy)
 734                 return NULL;
 735
 736         wiphy->privid = mac80211_wiphy_privid;
 737
 738         local = wiphy_priv(wiphy);
 739         local->hw.wiphy = wiphy;
 740
 741         local->hw.priv = (char *)local +
 742                          ((sizeof(struct ieee80211_local) +
 743                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 744
 745         BUG_ON(!ops->tx);
 746         BUG_ON(!ops->start);
 747         BUG_ON(!ops->stop);
 748         BUG_ON(!ops->config);
 749         BUG_ON(!ops->add_interface);
 750         BUG_ON(!ops->remove_interface);
 751         BUG_ON(!ops->configure_filter);
 752         local->ops = ops;
 753
 754         local->hw.queues = 1; /* default */
 755
 756         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 757         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 758         local->short_retry_limit = 7;
 759         local->long_retry_limit = 4;
 760         local->hw.conf.radio_enabled = 1;
 761
 762         INIT_LIST_HEAD(&local->interfaces);
 763
 764         spin_lock_init(&local->key_lock);
 765
 766         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 767
 768         sta_info_init(local);
 769
 770         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 771                      (unsigned long)local);
 772         tasklet_disable(&local->tx_pending_tasklet);
 773
 774         tasklet_init(&local->tasklet,
 775                      ieee80211_tasklet_handler,
 776                      (unsigned long) local);
 777         tasklet_disable(&local->tasklet);
 778
 779         skb_queue_head_init(&local->skb_queue);
 780         skb_queue_head_init(&local->skb_queue_unreliable);
 781
 782         return local_to_hw(local);
 783 }
 784 EXPORT_SYMBOL(ieee80211_alloc_hw);
 785
 786 int ieee80211_register_hw(struct ieee80211_hw *hw)
 787 {
 788         struct ieee80211_local *local = hw_to_local(hw);
 789         const char *name;
 790         int result;
 791         enum ieee80211_band band;
 792         struct net_device *mdev;
 793         struct ieee80211_master_priv *mpriv;
 794
 795         /*
 796          * generic code guarantees at least one band,
 797          * set this very early because much code assumes
 798          * that hw.conf.channel is assigned
 799          */
 800         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 801                 struct ieee80211_supported_band *sband;
 802
 803                 sband = local->hw.wiphy->bands[band];
 804                 if (sband) {
 805                         /* init channel we're on */
 806                         local->hw.conf.channel =
 807                         local->oper_channel =
 808                         local->scan_channel = &sband->channels[0];
 809                         break;
 810                 }
 811         }
 812
 813         /* if low-level driver supports AP, we also support VLAN */
 814         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 815                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 816
 817         /* mac80211 always supports monitor */
 818         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 819
 820         result = wiphy_register(local->hw.wiphy);
 821         if (result < 0)
 822                 return result;
 823
 824         /*
 825          * We use the number of queues for feature tests (QoS, HT) internally
 826          * so restrict them appropriately.
 827          */
 828         if (hw->queues > IEEE80211_MAX_QUEUES)
 829                 hw->queues = IEEE80211_MAX_QUEUES;
 830         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 831                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 832         if (hw->queues < 4)
 833                 hw->ampdu_queues = 0;
 834
 835         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 836                                "wmaster%d", ether_setup,
 837                                ieee80211_num_queues(hw));
 838         if (!mdev)
 839                 goto fail_mdev_alloc;
 840
 841         mpriv = netdev_priv(mdev);
 842         mpriv->local = local;
 843         local->mdev = mdev;
 844
 845         ieee80211_rx_bss_list_init(local);
 846
 847         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 848         mdev->open = ieee80211_master_open;
 849         mdev->stop = ieee80211_master_stop;
 850         mdev->type = ARPHRD_IEEE80211;
 851         mdev->header_ops = &ieee80211_header_ops;
 852         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 853
 854         name = wiphy_dev(local->hw.wiphy)->driver->name;
 855         local->hw.workqueue = create_freezeable_workqueue(name);
 856         if (!local->hw.workqueue) {
 857                 result = -ENOMEM;
 858                 goto fail_workqueue;
 859         }
 860
 861         /*
 862          * The hardware needs headroom for sending the frame,
 863          * and we need some headroom for passing the frame to monitor
 864          * interfaces, but never both at the same time.
 865          */
 866         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 867                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 868
 869         debugfs_hw_add(local);
 870
 871         if (local->hw.conf.beacon_int < 10)
 872                 local->hw.conf.beacon_int = 100;
 873
 874         if (local->hw.max_listen_interval == 0)
 875                 local->hw.max_listen_interval = 1;
 876
 877         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 878
 879         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 880                                                   IEEE80211_HW_SIGNAL_DB |
 881                                                   IEEE80211_HW_SIGNAL_DBM) ?
 882                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 883         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 884                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 885         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 886                 local->wstats_flags |= IW_QUAL_DBM;
 887
 888         result = sta_info_start(local);
 889         if (result < 0)
 890                 goto fail_sta_info;
 891
 892         rtnl_lock();
 893         result = dev_alloc_name(local->mdev, local->mdev->name);
 894         if (result < 0)
 895                 goto fail_dev;
 896
 897         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 898         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 899
 900         result = register_netdevice(local->mdev);
 901         if (result < 0)
 902                 goto fail_dev;
 903
 904         result = ieee80211_init_rate_ctrl_alg(local,
 905                                               hw->rate_control_algorithm);
 906         if (result < 0) {
 907                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 908                        "algorithm\n", wiphy_name(local->hw.wiphy));
 909                 goto fail_rate;
 910         }
 911
 912         result = ieee80211_wep_init(local);
 913
 914         if (result < 0) {
 915                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 916                        wiphy_name(local->hw.wiphy), result);
 917                 goto fail_wep;
 918         }
 919
 920         local->mdev->select_queue = ieee80211_select_queue;
 921
 922         /* add one default STA interface */
 923         result = ieee80211_if_add(local, "wlan%d", NULL,
 924                                   NL80211_IFTYPE_STATION, NULL);
 925         if (result)
 926                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 927                        wiphy_name(local->hw.wiphy));
 928
 929         rtnl_unlock();
 930
 931         ieee80211_led_init(local);
 932
 933         return 0;
 934
 935 fail_wep:
 936         rate_control_deinitialize(local);
 937 fail_rate:
 938         unregister_netdevice(local->mdev);
 939         local->mdev = NULL;
 940 fail_dev:
 941         rtnl_unlock();
 942         sta_info_stop(local);
 943 fail_sta_info:
 944         debugfs_hw_del(local);
 945         destroy_workqueue(local->hw.workqueue);
 946 fail_workqueue:
 947         if (local->mdev)
 948                 free_netdev(local->mdev);
 949 fail_mdev_alloc:
 950         wiphy_unregister(local->hw.wiphy);
 951         return result;
 952 }
 953 EXPORT_SYMBOL(ieee80211_register_hw);
 954
 955 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 956 {
 957         struct ieee80211_local *local = hw_to_local(hw);
 958
 959         tasklet_kill(&local->tx_pending_tasklet);
 960         tasklet_kill(&local->tasklet);
 961
 962         rtnl_lock();
 963
 964         /*
 965          * At this point, interface list manipulations are fine
 966          * because the driver cannot be handing us frames any
 967          * more and the tasklet is killed.
 968          */
 969
 970         /* First, we remove all virtual interfaces. */
 971         ieee80211_remove_interfaces(local);
 972
 973         /* then, finally, remove the master interface */
 974         unregister_netdevice(local->mdev);
 975
 976         rtnl_unlock();
 977
 978         ieee80211_rx_bss_list_deinit(local);
 979         ieee80211_clear_tx_pending(local);
 980         sta_info_stop(local);
 981         rate_control_deinitialize(local);
 982         debugfs_hw_del(local);
 983
 984         if (skb_queue_len(&local->skb_queue)
 985                         || skb_queue_len(&local->skb_queue_unreliable))
 986                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 987                        wiphy_name(local->hw.wiphy));
 988         skb_queue_purge(&local->skb_queue);
 989         skb_queue_purge(&local->skb_queue_unreliable);
 990
 991         destroy_workqueue(local->hw.workqueue);
 992         wiphy_unregister(local->hw.wiphy);
 993         ieee80211_wep_free(local);
 994         ieee80211_led_exit(local);
 995         free_netdev(local->mdev);
 996 }
 997 EXPORT_SYMBOL(ieee80211_unregister_hw);
 998
 999 void ieee80211_free_hw(struct ieee80211_hw *hw)
1000 {
1001         struct ieee80211_local *local = hw_to_local(hw);
1002
1003         wiphy_free(local->hw.wiphy);
1004 }
1005 EXPORT_SYMBOL(ieee80211_free_hw);
1006
1007 static int __init ieee80211_init(void)
1008 {
1009         struct sk_buff *skb;
1010         int ret;
1011
1012         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1013         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1014                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1015
1016         ret = rc80211_pid_init();
1017         if (ret)
1018                 return ret;
1019
1020         ieee80211_debugfs_netdev_init();
1021
1022         return 0;
1023 }
1024
1025 static void __exit ieee80211_exit(void)
1026 {
1027         rc80211_pid_exit();
1028
1029         /*
1030          * For key todo, it'll be empty by now but the work
1031          * might still be scheduled.
1032          */
1033         flush_scheduled_work();
1034
1035         if (mesh_allocated)
1036                 ieee80211s_stop();
1037
1038         ieee80211_debugfs_netdev_exit();
1039 }
1040
1041
1042 subsys_initcall(ieee80211_init);
1043 module_exit(ieee80211_exit);
1044
1045 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1046 MODULE_LICENSE("GPL");