git.oblomov.eu Git - 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         __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                  * HW reconfiguration should never fail, the driver has told
 229                  * us what it can support so it should live up to that promise.
 230                  */
 231                 WARN_ON(ret);
 232         }
 233
 234         return ret;
 235 }
 236
 237 /**
 238  * ieee80211_handle_ht should be used only after legacy configuration
 239  * has been determined namely band, as ht configuration depends upon
 240  * the hardware's HT abilities for a _specific_ band.
 241  */
 242 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 243                            struct ieee80211_ht_info *req_ht_cap,
 244                            struct ieee80211_ht_bss_info *req_bss_cap)
 245 {
 246         struct ieee80211_conf *conf = &local->hw.conf;
 247         struct ieee80211_supported_band *sband;
 248         struct ieee80211_ht_info ht_conf;
 249         struct ieee80211_ht_bss_info ht_bss_conf;
 250         u32 changed = 0;
 251         int i;
 252         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
 253         u8 tx_mcs_set_cap;
 254
 255         sband = local->hw.wiphy->bands[conf->channel->band];
 256
 257         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
 258         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
 259
 260         /* HT is not supported */
 261         if (!sband->ht_info.ht_supported) {
 262                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 263                 goto out;
 264         }
 265
 266         /* disable HT */
 267         if (!enable_ht) {
 268                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
 269                         changed |= BSS_CHANGED_HT;
 270                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 271                 conf->ht_conf.ht_supported = 0;
 272                 goto out;
 273         }
 274
 275
 276         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
 277                 changed |= BSS_CHANGED_HT;
 278
 279         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 280         ht_conf.ht_supported = 1;
 281
 282         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
 283         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
 284         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
 285         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
 286         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 287         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 288
 289         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 290         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 291
 292         /* Bits 96-100 */
 293         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
 294
 295         /* configure suppoerted Tx MCS according to requested MCS
 296          * (based in most cases on Rx capabilities of peer) and self
 297          * Tx MCS capabilities (as defined by low level driver HW
 298          * Tx capabilities) */
 299         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
 300                 goto check_changed;
 301
 302         /* Counting from 0 therfore + 1 */
 303         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
 304                 max_tx_streams = ((tx_mcs_set_cap &
 305                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
 306
 307         for (i = 0; i < max_tx_streams; i++)
 308                 ht_conf.supp_mcs_set[i] =
 309                         sband->ht_info.supp_mcs_set[i] &
 310                                         req_ht_cap->supp_mcs_set[i];
 311
 312         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
 313                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
 314                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
 315                         ht_conf.supp_mcs_set[i] =
 316                                 sband->ht_info.supp_mcs_set[i] &
 317                                         req_ht_cap->supp_mcs_set[i];
 318
 319 check_changed:
 320         /* if bss configuration changed store the new one */
 321         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
 322             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
 323                 changed |= BSS_CHANGED_HT;
 324                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
 325                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
 326         }
 327 out:
 328         return changed;
 329 }
 330
 331 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 332                                       u32 changed)
 333 {
 334         struct ieee80211_local *local = sdata->local;
 335
 336         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 337                 return;
 338
 339         if (!changed)
 340                 return;
 341
 342         if (local->ops->bss_info_changed)
 343                 local->ops->bss_info_changed(local_to_hw(local),
 344                                              &sdata->vif,
 345                                              &sdata->bss_conf,
 346                                              changed);
 347 }
 348
 349 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 350 {
 351         sdata->bss_conf.use_cts_prot = 0;
 352         sdata->bss_conf.use_short_preamble = 0;
 353         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
 354 }
 355
 356 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 357                                  struct sk_buff *skb)
 358 {
 359         struct ieee80211_local *local = hw_to_local(hw);
 360         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 361         int tmp;
 362
 363         skb->dev = local->mdev;
 364         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 365         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 366                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 367         tmp = skb_queue_len(&local->skb_queue) +
 368                 skb_queue_len(&local->skb_queue_unreliable);
 369         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 370                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 371                 dev_kfree_skb_irq(skb);
 372                 tmp--;
 373                 I802_DEBUG_INC(local->tx_status_drop);
 374         }
 375         tasklet_schedule(&local->tasklet);
 376 }
 377 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 378
 379 static void ieee80211_tasklet_handler(unsigned long data)
 380 {
 381         struct ieee80211_local *local = (struct ieee80211_local *) data;
 382         struct sk_buff *skb;
 383         struct ieee80211_rx_status rx_status;
 384         struct ieee80211_ra_tid *ra_tid;
 385
 386         while ((skb = skb_dequeue(&local->skb_queue)) ||
 387                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 388                 switch (skb->pkt_type) {
 389                 case IEEE80211_RX_MSG:
 390                         /* status is in skb->cb */
 391                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 392                         /* Clear skb->pkt_type in order to not confuse kernel
 393                          * netstack. */
 394                         skb->pkt_type = 0;
 395                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 396                         break;
 397                 case IEEE80211_TX_STATUS_MSG:
 398                         skb->pkt_type = 0;
 399                         ieee80211_tx_status(local_to_hw(local), skb);
 400                         break;
 401                 case IEEE80211_DELBA_MSG:
 402                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 403                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 404                                                 ra_tid->ra, ra_tid->tid);
 405                         dev_kfree_skb(skb);
 406                         break;
 407                 case IEEE80211_ADDBA_MSG:
 408                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 409                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 410                                                  ra_tid->ra, ra_tid->tid);
 411                         dev_kfree_skb(skb);
 412                         break ;
 413                 default:
 414                         WARN_ON(1);
 415                         dev_kfree_skb(skb);
 416                         break;
 417                 }
 418         }
 419 }
 420
 421 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 422  * make a prepared TX frame (one that has been given to hw) to look like brand
 423  * new IEEE 802.11 frame that is ready to go through TX processing again.
 424  */
 425 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 426                                       struct ieee80211_key *key,
 427                                       struct sk_buff *skb)
 428 {
 429         unsigned int hdrlen, iv_len, mic_len;
 430         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 431
 432         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 433
 434         if (!key)
 435                 goto no_key;
 436
 437         switch (key->conf.alg) {
 438         case ALG_WEP:
 439                 iv_len = WEP_IV_LEN;
 440                 mic_len = WEP_ICV_LEN;
 441                 break;
 442         case ALG_TKIP:
 443                 iv_len = TKIP_IV_LEN;
 444                 mic_len = TKIP_ICV_LEN;
 445                 break;
 446         case ALG_CCMP:
 447                 iv_len = CCMP_HDR_LEN;
 448                 mic_len = CCMP_MIC_LEN;
 449                 break;
 450         default:
 451                 goto no_key;
 452         }
 453
 454         if (skb->len >= hdrlen + mic_len &&
 455             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 456                 skb_trim(skb, skb->len - mic_len);
 457         if (skb->len >= hdrlen + iv_len) {
 458                 memmove(skb->data + iv_len, skb->data, hdrlen);
 459                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 460         }
 461
 462 no_key:
 463         if (ieee80211_is_data_qos(hdr->frame_control)) {
 464                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 465                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 466                         hdrlen - IEEE80211_QOS_CTL_LEN);
 467                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 468         }
 469 }
 470
 471 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 472                                             struct sta_info *sta,
 473                                             struct sk_buff *skb)
 474 {
 475         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 476
 477         sta->tx_filtered_count++;
 478
 479         /*
 480          * Clear the TX filter mask for this STA when sending the next
 481          * packet. If the STA went to power save mode, this will happen
 482          * when it wakes up for the next time.
 483          */
 484         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 485
 486         /*
 487          * This code races in the following way:
 488          *
 489          *  (1) STA sends frame indicating it will go to sleep and does so
 490          *  (2) hardware/firmware adds STA to filter list, passes frame up
 491          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 492          *  (4) we get TX status before having processed the frame and
 493          *      knowing that the STA has gone to sleep.
 494          *
 495          * This is actually quite unlikely even when both those events are
 496          * processed from interrupts coming in quickly after one another or
 497          * even at the same time because we queue both TX status events and
 498          * RX frames to be processed by a tasklet and process them in the
 499          * same order that they were received or TX status last. Hence, there
 500          * is no race as long as the frame RX is processed before the next TX
 501          * status, which drivers can ensure, see below.
 502          *
 503          * Note that this can only happen if the hardware or firmware can
 504          * actually add STAs to the filter list, if this is done by the
 505          * driver in response to set_tim() (which will only reduce the race
 506          * this whole filtering tries to solve, not completely solve it)
 507          * this situation cannot happen.
 508          *
 509          * To completely solve this race drivers need to make sure that they
 510          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 511          *      functions and
 512          *  (b) always process RX events before TX status events if ordering
 513          *      can be unknown, for example with different interrupt status
 514          *      bits.
 515          */
 516         if (test_sta_flags(sta, WLAN_STA_PS) &&
 517             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 518                 ieee80211_remove_tx_extra(local, sta->key, skb);
 519                 skb_queue_tail(&sta->tx_filtered, skb);
 520                 return;
 521         }
 522
 523         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 524             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
 525                 /* Software retry the packet once */
 526                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 527                 ieee80211_remove_tx_extra(local, sta->key, skb);
 528                 dev_queue_xmit(skb);
 529                 return;
 530         }
 531
 532 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 533         if (net_ratelimit())
 534                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 535                        "queue_len=%d PS=%d @%lu\n",
 536                        wiphy_name(local->hw.wiphy),
 537                        skb_queue_len(&sta->tx_filtered),
 538                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 539 #endif
 540         dev_kfree_skb(skb);
 541 }
 542
 543 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 544 {
 545         struct sk_buff *skb2;
 546         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 547         struct ieee80211_local *local = hw_to_local(hw);
 548         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 549         u16 frag, type;
 550         __le16 fc;
 551         struct ieee80211_supported_band *sband;
 552         struct ieee80211_tx_status_rtap_hdr *rthdr;
 553         struct ieee80211_sub_if_data *sdata;
 554         struct net_device *prev_dev = NULL;
 555         struct sta_info *sta;
 556
 557         rcu_read_lock();
 558
 559         sta = sta_info_get(local, hdr->addr1);
 560
 561         if (sta) {
 562                 if (info->status.excessive_retries &&
 563                     test_sta_flags(sta, WLAN_STA_PS)) {
 564                         /*
 565                          * The STA is in power save mode, so assume
 566                          * that this TX packet failed because of that.
 567                          */
 568                         ieee80211_handle_filtered_frame(local, sta, skb);
 569                         rcu_read_unlock();
 570                         return;
 571                 }
 572
 573                 fc = hdr->frame_control;
 574
 575                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 576                     (ieee80211_is_data_qos(fc))) {
 577                         u16 tid, ssn;
 578                         u8 *qc;
 579
 580                         qc = ieee80211_get_qos_ctl(hdr);
 581                         tid = qc[0] & 0xf;
 582                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 583                                                 & IEEE80211_SCTL_SEQ);
 584                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 585                                            tid, ssn);
 586                 }
 587
 588                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 589                         ieee80211_handle_filtered_frame(local, sta, skb);
 590                         rcu_read_unlock();
 591                         return;
 592                 } else {
 593                         if (info->status.excessive_retries)
 594                                 sta->tx_retry_failed++;
 595                         sta->tx_retry_count += info->status.retry_count;
 596                 }
 597
 598                 sband = local->hw.wiphy->bands[info->band];
 599                 rate_control_tx_status(local, sband, sta, skb);
 600         }
 601
 602         rcu_read_unlock();
 603
 604         ieee80211_led_tx(local, 0);
 605
 606         /* SNMP counters
 607          * Fragments are passed to low-level drivers as separate skbs, so these
 608          * are actually fragments, not frames. Update frame counters only for
 609          * the first fragment of the frame. */
 610
 611         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 612         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 613
 614         if (info->flags & IEEE80211_TX_STAT_ACK) {
 615                 if (frag == 0) {
 616                         local->dot11TransmittedFrameCount++;
 617                         if (is_multicast_ether_addr(hdr->addr1))
 618                                 local->dot11MulticastTransmittedFrameCount++;
 619                         if (info->status.retry_count > 0)
 620                                 local->dot11RetryCount++;
 621                         if (info->status.retry_count > 1)
 622                                 local->dot11MultipleRetryCount++;
 623                 }
 624
 625                 /* This counter shall be incremented for an acknowledged MPDU
 626                  * with an individual address in the address 1 field or an MPDU
 627                  * with a multicast address in the address 1 field of type Data
 628                  * or Management. */
 629                 if (!is_multicast_ether_addr(hdr->addr1) ||
 630                     type == IEEE80211_FTYPE_DATA ||
 631                     type == IEEE80211_FTYPE_MGMT)
 632                         local->dot11TransmittedFragmentCount++;
 633         } else {
 634                 if (frag == 0)
 635                         local->dot11FailedCount++;
 636         }
 637
 638         /* this was a transmitted frame, but now we want to reuse it */
 639         skb_orphan(skb);
 640
 641         /*
 642          * This is a bit racy but we can avoid a lot of work
 643          * with this test...
 644          */
 645         if (!local->monitors && !local->cooked_mntrs) {
 646                 dev_kfree_skb(skb);
 647                 return;
 648         }
 649
 650         /* send frame to monitor interfaces now */
 651
 652         if (skb_headroom(skb) < sizeof(*rthdr)) {
 653                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 654                 dev_kfree_skb(skb);
 655                 return;
 656         }
 657
 658         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 659                                 skb_push(skb, sizeof(*rthdr));
 660
 661         memset(rthdr, 0, sizeof(*rthdr));
 662         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 663         rthdr->hdr.it_present =
 664                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 665                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 666
 667         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 668             !is_multicast_ether_addr(hdr->addr1))
 669                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 670
 671         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
 672             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
 673                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 674         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
 675                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 676
 677         rthdr->data_retries = info->status.retry_count;
 678
 679         /* XXX: is this sufficient for BPF? */
 680         skb_set_mac_header(skb, 0);
 681         skb->ip_summed = CHECKSUM_UNNECESSARY;
 682         skb->pkt_type = PACKET_OTHERHOST;
 683         skb->protocol = htons(ETH_P_802_2);
 684         memset(skb->cb, 0, sizeof(skb->cb));
 685
 686         rcu_read_lock();
 687         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 688                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 689                         if (!netif_running(sdata->dev))
 690                                 continue;
 691
 692                         if (prev_dev) {
 693                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 694                                 if (skb2) {
 695                                         skb2->dev = prev_dev;
 696                                         netif_rx(skb2);
 697                                 }
 698                         }
 699
 700                         prev_dev = sdata->dev;
 701                 }
 702         }
 703         if (prev_dev) {
 704                 skb->dev = prev_dev;
 705                 netif_rx(skb);
 706                 skb = NULL;
 707         }
 708         rcu_read_unlock();
 709         dev_kfree_skb(skb);
 710 }
 711 EXPORT_SYMBOL(ieee80211_tx_status);
 712
 713 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 714                                         const struct ieee80211_ops *ops)
 715 {
 716         struct ieee80211_local *local;
 717         int priv_size;
 718         struct wiphy *wiphy;
 719
 720         /* Ensure 32-byte alignment of our private data and hw private data.
 721          * We use the wiphy priv data for both our ieee80211_local and for
 722          * the driver's private data
 723          *
 724          * In memory it'll be like this:
 725          *
 726          * +-------------------------+
 727          * | struct wiphy           |
 728          * +-------------------------+
 729          * | struct ieee80211_local  |
 730          * +-------------------------+
 731          * | driver's private data   |
 732          * +-------------------------+
 733          *
 734          */
 735         priv_size = ((sizeof(struct ieee80211_local) +
 736                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 737                     priv_data_len;
 738
 739         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 740
 741         if (!wiphy)
 742                 return NULL;
 743
 744         wiphy->privid = mac80211_wiphy_privid;
 745
 746         local = wiphy_priv(wiphy);
 747         local->hw.wiphy = wiphy;
 748
 749         local->hw.priv = (char *)local +
 750                          ((sizeof(struct ieee80211_local) +
 751                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 752
 753         BUG_ON(!ops->tx);
 754         BUG_ON(!ops->start);
 755         BUG_ON(!ops->stop);
 756         BUG_ON(!ops->config);
 757         BUG_ON(!ops->add_interface);
 758         BUG_ON(!ops->remove_interface);
 759         BUG_ON(!ops->configure_filter);
 760         local->ops = ops;
 761
 762         local->hw.queues = 1; /* default */
 763
 764         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 765         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 766         local->short_retry_limit = 7;
 767         local->long_retry_limit = 4;
 768         local->hw.conf.radio_enabled = 1;
 769
 770         INIT_LIST_HEAD(&local->interfaces);
 771
 772         spin_lock_init(&local->key_lock);
 773
 774         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 775
 776         sta_info_init(local);
 777
 778         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 779                      (unsigned long)local);
 780         tasklet_disable(&local->tx_pending_tasklet);
 781
 782         tasklet_init(&local->tasklet,
 783                      ieee80211_tasklet_handler,
 784                      (unsigned long) local);
 785         tasklet_disable(&local->tasklet);
 786
 787         skb_queue_head_init(&local->skb_queue);
 788         skb_queue_head_init(&local->skb_queue_unreliable);
 789
 790         return local_to_hw(local);
 791 }
 792 EXPORT_SYMBOL(ieee80211_alloc_hw);
 793
 794 int ieee80211_register_hw(struct ieee80211_hw *hw)
 795 {
 796         struct ieee80211_local *local = hw_to_local(hw);
 797         const char *name;
 798         int result;
 799         enum ieee80211_band band;
 800         struct net_device *mdev;
 801         struct ieee80211_master_priv *mpriv;
 802
 803         /*
 804          * generic code guarantees at least one band,
 805          * set this very early because much code assumes
 806          * that hw.conf.channel is assigned
 807          */
 808         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 809                 struct ieee80211_supported_band *sband;
 810
 811                 sband = local->hw.wiphy->bands[band];
 812                 if (sband) {
 813                         /* init channel we're on */
 814                         local->hw.conf.channel =
 815                         local->oper_channel =
 816                         local->scan_channel = &sband->channels[0];
 817                         break;
 818                 }
 819         }
 820
 821         /* if low-level driver supports AP, we also support VLAN */
 822         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 823                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 824
 825         /* mac80211 always supports monitor */
 826         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 827
 828         result = wiphy_register(local->hw.wiphy);
 829         if (result < 0)
 830                 return result;
 831
 832         /*
 833          * We use the number of queues for feature tests (QoS, HT) internally
 834          * so restrict them appropriately.
 835          */
 836         if (hw->queues > IEEE80211_MAX_QUEUES)
 837                 hw->queues = IEEE80211_MAX_QUEUES;
 838         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 839                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 840         if (hw->queues < 4)
 841                 hw->ampdu_queues = 0;
 842
 843         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 844                                "wmaster%d", ether_setup,
 845                                ieee80211_num_queues(hw));
 846         if (!mdev)
 847                 goto fail_mdev_alloc;
 848
 849         mpriv = netdev_priv(mdev);
 850         mpriv->local = local;
 851         local->mdev = mdev;
 852
 853         ieee80211_rx_bss_list_init(local);
 854
 855         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 856         mdev->open = ieee80211_master_open;
 857         mdev->stop = ieee80211_master_stop;
 858         mdev->type = ARPHRD_IEEE80211;
 859         mdev->header_ops = &ieee80211_header_ops;
 860         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 861
 862         name = wiphy_dev(local->hw.wiphy)->driver->name;
 863         local->hw.workqueue = create_freezeable_workqueue(name);
 864         if (!local->hw.workqueue) {
 865                 result = -ENOMEM;
 866                 goto fail_workqueue;
 867         }
 868
 869         /*
 870          * The hardware needs headroom for sending the frame,
 871          * and we need some headroom for passing the frame to monitor
 872          * interfaces, but never both at the same time.
 873          */
 874         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 875                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 876
 877         debugfs_hw_add(local);
 878
 879         if (local->hw.conf.beacon_int < 10)
 880                 local->hw.conf.beacon_int = 100;
 881
 882         if (local->hw.max_listen_interval == 0)
 883                 local->hw.max_listen_interval = 1;
 884
 885         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 886
 887         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 888                                                   IEEE80211_HW_SIGNAL_DB |
 889                                                   IEEE80211_HW_SIGNAL_DBM) ?
 890                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 891         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 892                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 893         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 894                 local->wstats_flags |= IW_QUAL_DBM;
 895
 896         result = sta_info_start(local);
 897         if (result < 0)
 898                 goto fail_sta_info;
 899
 900         rtnl_lock();
 901         result = dev_alloc_name(local->mdev, local->mdev->name);
 902         if (result < 0)
 903                 goto fail_dev;
 904
 905         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 906         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 907
 908         result = register_netdevice(local->mdev);
 909         if (result < 0)
 910                 goto fail_dev;
 911
 912         result = ieee80211_init_rate_ctrl_alg(local,
 913                                               hw->rate_control_algorithm);
 914         if (result < 0) {
 915                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 916                        "algorithm\n", wiphy_name(local->hw.wiphy));
 917                 goto fail_rate;
 918         }
 919
 920         result = ieee80211_wep_init(local);
 921
 922         if (result < 0) {
 923                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 924                        wiphy_name(local->hw.wiphy), result);
 925                 goto fail_wep;
 926         }
 927
 928         local->mdev->select_queue = ieee80211_select_queue;
 929
 930         /* add one default STA interface */
 931         result = ieee80211_if_add(local, "wlan%d", NULL,
 932                                   NL80211_IFTYPE_STATION, NULL);
 933         if (result)
 934                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 935                        wiphy_name(local->hw.wiphy));
 936
 937         rtnl_unlock();
 938
 939         ieee80211_led_init(local);
 940
 941         return 0;
 942
 943 fail_wep:
 944         rate_control_deinitialize(local);
 945 fail_rate:
 946         unregister_netdevice(local->mdev);
 947         local->mdev = NULL;
 948 fail_dev:
 949         rtnl_unlock();
 950         sta_info_stop(local);
 951 fail_sta_info:
 952         debugfs_hw_del(local);
 953         destroy_workqueue(local->hw.workqueue);
 954 fail_workqueue:
 955         if (local->mdev)
 956                 free_netdev(local->mdev);
 957 fail_mdev_alloc:
 958         wiphy_unregister(local->hw.wiphy);
 959         return result;
 960 }
 961 EXPORT_SYMBOL(ieee80211_register_hw);
 962
 963 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 964 {
 965         struct ieee80211_local *local = hw_to_local(hw);
 966
 967         tasklet_kill(&local->tx_pending_tasklet);
 968         tasklet_kill(&local->tasklet);
 969
 970         rtnl_lock();
 971
 972         /*
 973          * At this point, interface list manipulations are fine
 974          * because the driver cannot be handing us frames any
 975          * more and the tasklet is killed.
 976          */
 977
 978         /* First, we remove all virtual interfaces. */
 979         ieee80211_remove_interfaces(local);
 980
 981         /* then, finally, remove the master interface */
 982         unregister_netdevice(local->mdev);
 983
 984         rtnl_unlock();
 985
 986         ieee80211_rx_bss_list_deinit(local);
 987         ieee80211_clear_tx_pending(local);
 988         sta_info_stop(local);
 989         rate_control_deinitialize(local);
 990         debugfs_hw_del(local);
 991
 992         if (skb_queue_len(&local->skb_queue)
 993                         || skb_queue_len(&local->skb_queue_unreliable))
 994                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 995                        wiphy_name(local->hw.wiphy));
 996         skb_queue_purge(&local->skb_queue);
 997         skb_queue_purge(&local->skb_queue_unreliable);
 998
 999         destroy_workqueue(local->hw.workqueue);
1000         wiphy_unregister(local->hw.wiphy);
1001         ieee80211_wep_free(local);
1002         ieee80211_led_exit(local);
1003         free_netdev(local->mdev);
1004 }
1005 EXPORT_SYMBOL(ieee80211_unregister_hw);
1006
1007 void ieee80211_free_hw(struct ieee80211_hw *hw)
1008 {
1009         struct ieee80211_local *local = hw_to_local(hw);
1010
1011         wiphy_free(local->hw.wiphy);
1012 }
1013 EXPORT_SYMBOL(ieee80211_free_hw);
1014
1015 static int __init ieee80211_init(void)
1016 {
1017         struct sk_buff *skb;
1018         int ret;
1019
1020         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1021         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1022                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1023
1024         ret = rc80211_minstrel_init();
1025         if (ret)
1026                 return ret;
1027
1028         ret = rc80211_pid_init();
1029         if (ret)
1030                 return ret;
1031
1032         ieee80211_debugfs_netdev_init();
1033
1034         return 0;
1035 }
1036
1037 static void __exit ieee80211_exit(void)
1038 {
1039         rc80211_pid_exit();
1040         rc80211_minstrel_exit();
1041
1042         /*
1043          * For key todo, it'll be empty by now but the work
1044          * might still be scheduled.
1045          */
1046         flush_scheduled_work();
1047
1048         if (mesh_allocated)
1049                 ieee80211s_stop();
1050
1051         ieee80211_debugfs_netdev_exit();
1052 }
1053
1054
1055 subsys_initcall(ieee80211_init);
1056 module_exit(ieee80211_exit);
1057
1058 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1059 MODULE_LICENSE("GPL");