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_local *local = wdev_priv(dev->ieee80211_ptr);
 110         struct ieee80211_sub_if_data *sdata;
 111         int res = -EOPNOTSUPP;
 112
 113         /* we hold the RTNL here so can safely walk the list */
 114         list_for_each_entry(sdata, &local->interfaces, list) {
 115                 if (netif_running(sdata->dev)) {
 116                         res = 0;
 117                         break;
 118                 }
 119         }
 120
 121         if (res)
 122                 return res;
 123
 124         netif_tx_start_all_queues(local->mdev);
 125
 126         return 0;
 127 }
 128
 129 static int ieee80211_master_stop(struct net_device *dev)
 130 {
 131         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 132         struct ieee80211_sub_if_data *sdata;
 133
 134         /* we hold the RTNL here so can safely walk the list */
 135         list_for_each_entry(sdata, &local->interfaces, list)
 136                 if (netif_running(sdata->dev))
 137                         dev_close(sdata->dev);
 138
 139         return 0;
 140 }
 141
 142 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 143 {
 144         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 145
 146         ieee80211_configure_filter(local);
 147 }
 148
 149 /* everything else */
 150
 151 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 152 {
 153         struct ieee80211_local *local = sdata->local;
 154         struct ieee80211_if_conf conf;
 155
 156         if (WARN_ON(!netif_running(sdata->dev)))
 157                 return 0;
 158
 159         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 160                 return -EINVAL;
 161
 162         if (!local->ops->config_interface)
 163                 return 0;
 164
 165         memset(&conf, 0, sizeof(conf));
 166         conf.changed = changed;
 167
 168         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 169             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 170                 conf.bssid = sdata->u.sta.bssid;
 171                 conf.ssid = sdata->u.sta.ssid;
 172                 conf.ssid_len = sdata->u.sta.ssid_len;
 173         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 174                 conf.bssid = sdata->dev->dev_addr;
 175                 conf.ssid = sdata->u.ap.ssid;
 176                 conf.ssid_len = sdata->u.ap.ssid_len;
 177         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 178                 u8 zero[ETH_ALEN] = { 0 };
 179                 conf.bssid = zero;
 180                 conf.ssid = zero;
 181                 conf.ssid_len = 0;
 182         } else {
 183                 WARN_ON(1);
 184                 return -EINVAL;
 185         }
 186
 187         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 188                 return -EINVAL;
 189
 190         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 191                 return -EINVAL;
 192
 193         return local->ops->config_interface(local_to_hw(local),
 194                                             &sdata->vif, &conf);
 195 }
 196
 197 int ieee80211_hw_config(struct ieee80211_local *local)
 198 {
 199         struct ieee80211_channel *chan;
 200         int ret = 0;
 201
 202         if (local->sw_scanning)
 203                 chan = local->scan_channel;
 204         else
 205                 chan = local->oper_channel;
 206
 207         local->hw.conf.channel = chan;
 208
 209         if (!local->hw.conf.power_level)
 210                 local->hw.conf.power_level = chan->max_power;
 211         else
 212                 local->hw.conf.power_level = min(chan->max_power,
 213                                                local->hw.conf.power_level);
 214
 215         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
 216
 217 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 218         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 219                wiphy_name(local->hw.wiphy), chan->center_freq);
 220 #endif
 221
 222         if (local->open_count)
 223                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 224
 225         return ret;
 226 }
 227
 228 /**
 229  * ieee80211_handle_ht should be used only after legacy configuration
 230  * has been determined namely band, as ht configuration depends upon
 231  * the hardware's HT abilities for a _specific_ band.
 232  */
 233 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 234                            struct ieee80211_ht_info *req_ht_cap,
 235                            struct ieee80211_ht_bss_info *req_bss_cap)
 236 {
 237         struct ieee80211_conf *conf = &local->hw.conf;
 238         struct ieee80211_supported_band *sband;
 239         struct ieee80211_ht_info ht_conf;
 240         struct ieee80211_ht_bss_info ht_bss_conf;
 241         u32 changed = 0;
 242         int i;
 243         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
 244         u8 tx_mcs_set_cap;
 245
 246         sband = local->hw.wiphy->bands[conf->channel->band];
 247
 248         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
 249         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
 250
 251         /* HT is not supported */
 252         if (!sband->ht_info.ht_supported) {
 253                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 254                 goto out;
 255         }
 256
 257         /* disable HT */
 258         if (!enable_ht) {
 259                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
 260                         changed |= BSS_CHANGED_HT;
 261                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 262                 conf->ht_conf.ht_supported = 0;
 263                 goto out;
 264         }
 265
 266
 267         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
 268                 changed |= BSS_CHANGED_HT;
 269
 270         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 271         ht_conf.ht_supported = 1;
 272
 273         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
 274         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
 275         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
 276         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
 277         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 278         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 279
 280         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 281         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 282
 283         /* Bits 96-100 */
 284         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
 285
 286         /* configure suppoerted Tx MCS according to requested MCS
 287          * (based in most cases on Rx capabilities of peer) and self
 288          * Tx MCS capabilities (as defined by low level driver HW
 289          * Tx capabilities) */
 290         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
 291                 goto check_changed;
 292
 293         /* Counting from 0 therfore + 1 */
 294         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
 295                 max_tx_streams = ((tx_mcs_set_cap &
 296                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
 297
 298         for (i = 0; i < max_tx_streams; i++)
 299                 ht_conf.supp_mcs_set[i] =
 300                         sband->ht_info.supp_mcs_set[i] &
 301                                         req_ht_cap->supp_mcs_set[i];
 302
 303         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
 304                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
 305                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
 306                         ht_conf.supp_mcs_set[i] =
 307                                 sband->ht_info.supp_mcs_set[i] &
 308                                         req_ht_cap->supp_mcs_set[i];
 309
 310 check_changed:
 311         /* if bss configuration changed store the new one */
 312         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
 313             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
 314                 changed |= BSS_CHANGED_HT;
 315                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
 316                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
 317         }
 318 out:
 319         return changed;
 320 }
 321
 322 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 323                                       u32 changed)
 324 {
 325         struct ieee80211_local *local = sdata->local;
 326
 327         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 328                 return;
 329
 330         if (!changed)
 331                 return;
 332
 333         if (local->ops->bss_info_changed)
 334                 local->ops->bss_info_changed(local_to_hw(local),
 335                                              &sdata->vif,
 336                                              &sdata->bss_conf,
 337                                              changed);
 338 }
 339
 340 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 341 {
 342         sdata->bss_conf.use_cts_prot = 0;
 343         sdata->bss_conf.use_short_preamble = 0;
 344         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
 345 }
 346
 347 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 348                                  struct sk_buff *skb)
 349 {
 350         struct ieee80211_local *local = hw_to_local(hw);
 351         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 352         int tmp;
 353
 354         skb->dev = local->mdev;
 355         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 356         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 357                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 358         tmp = skb_queue_len(&local->skb_queue) +
 359                 skb_queue_len(&local->skb_queue_unreliable);
 360         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 361                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 362                 dev_kfree_skb_irq(skb);
 363                 tmp--;
 364                 I802_DEBUG_INC(local->tx_status_drop);
 365         }
 366         tasklet_schedule(&local->tasklet);
 367 }
 368 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 369
 370 static void ieee80211_tasklet_handler(unsigned long data)
 371 {
 372         struct ieee80211_local *local = (struct ieee80211_local *) data;
 373         struct sk_buff *skb;
 374         struct ieee80211_rx_status rx_status;
 375         struct ieee80211_ra_tid *ra_tid;
 376
 377         while ((skb = skb_dequeue(&local->skb_queue)) ||
 378                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 379                 switch (skb->pkt_type) {
 380                 case IEEE80211_RX_MSG:
 381                         /* status is in skb->cb */
 382                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 383                         /* Clear skb->pkt_type in order to not confuse kernel
 384                          * netstack. */
 385                         skb->pkt_type = 0;
 386                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 387                         break;
 388                 case IEEE80211_TX_STATUS_MSG:
 389                         skb->pkt_type = 0;
 390                         ieee80211_tx_status(local_to_hw(local), skb);
 391                         break;
 392                 case IEEE80211_DELBA_MSG:
 393                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 394                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 395                                                 ra_tid->ra, ra_tid->tid);
 396                         dev_kfree_skb(skb);
 397                         break;
 398                 case IEEE80211_ADDBA_MSG:
 399                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 400                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 401                                                  ra_tid->ra, ra_tid->tid);
 402                         dev_kfree_skb(skb);
 403                         break ;
 404                 default:
 405                         WARN_ON(1);
 406                         dev_kfree_skb(skb);
 407                         break;
 408                 }
 409         }
 410 }
 411
 412 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 413  * make a prepared TX frame (one that has been given to hw) to look like brand
 414  * new IEEE 802.11 frame that is ready to go through TX processing again.
 415  */
 416 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 417                                       struct ieee80211_key *key,
 418                                       struct sk_buff *skb)
 419 {
 420         unsigned int hdrlen, iv_len, mic_len;
 421         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 422
 423         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 424
 425         if (!key)
 426                 goto no_key;
 427
 428         switch (key->conf.alg) {
 429         case ALG_WEP:
 430                 iv_len = WEP_IV_LEN;
 431                 mic_len = WEP_ICV_LEN;
 432                 break;
 433         case ALG_TKIP:
 434                 iv_len = TKIP_IV_LEN;
 435                 mic_len = TKIP_ICV_LEN;
 436                 break;
 437         case ALG_CCMP:
 438                 iv_len = CCMP_HDR_LEN;
 439                 mic_len = CCMP_MIC_LEN;
 440                 break;
 441         default:
 442                 goto no_key;
 443         }
 444
 445         if (skb->len >= hdrlen + mic_len &&
 446             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 447                 skb_trim(skb, skb->len - mic_len);
 448         if (skb->len >= hdrlen + iv_len) {
 449                 memmove(skb->data + iv_len, skb->data, hdrlen);
 450                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 451         }
 452
 453 no_key:
 454         if (ieee80211_is_data_qos(hdr->frame_control)) {
 455                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 456                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 457                         hdrlen - IEEE80211_QOS_CTL_LEN);
 458                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 459         }
 460 }
 461
 462 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 463                                             struct sta_info *sta,
 464                                             struct sk_buff *skb)
 465 {
 466         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 467
 468         sta->tx_filtered_count++;
 469
 470         /*
 471          * Clear the TX filter mask for this STA when sending the next
 472          * packet. If the STA went to power save mode, this will happen
 473          * when it wakes up for the next time.
 474          */
 475         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 476
 477         /*
 478          * This code races in the following way:
 479          *
 480          *  (1) STA sends frame indicating it will go to sleep and does so
 481          *  (2) hardware/firmware adds STA to filter list, passes frame up
 482          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 483          *  (4) we get TX status before having processed the frame and
 484          *      knowing that the STA has gone to sleep.
 485          *
 486          * This is actually quite unlikely even when both those events are
 487          * processed from interrupts coming in quickly after one another or
 488          * even at the same time because we queue both TX status events and
 489          * RX frames to be processed by a tasklet and process them in the
 490          * same order that they were received or TX status last. Hence, there
 491          * is no race as long as the frame RX is processed before the next TX
 492          * status, which drivers can ensure, see below.
 493          *
 494          * Note that this can only happen if the hardware or firmware can
 495          * actually add STAs to the filter list, if this is done by the
 496          * driver in response to set_tim() (which will only reduce the race
 497          * this whole filtering tries to solve, not completely solve it)
 498          * this situation cannot happen.
 499          *
 500          * To completely solve this race drivers need to make sure that they
 501          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 502          *      functions and
 503          *  (b) always process RX events before TX status events if ordering
 504          *      can be unknown, for example with different interrupt status
 505          *      bits.
 506          */
 507         if (test_sta_flags(sta, WLAN_STA_PS) &&
 508             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 509                 ieee80211_remove_tx_extra(local, sta->key, skb);
 510                 skb_queue_tail(&sta->tx_filtered, skb);
 511                 return;
 512         }
 513
 514         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 515             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
 516                 /* Software retry the packet once */
 517                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 518                 ieee80211_remove_tx_extra(local, sta->key, skb);
 519                 dev_queue_xmit(skb);
 520                 return;
 521         }
 522
 523 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 524         if (net_ratelimit())
 525                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 526                        "queue_len=%d PS=%d @%lu\n",
 527                        wiphy_name(local->hw.wiphy),
 528                        skb_queue_len(&sta->tx_filtered),
 529                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 530 #endif
 531         dev_kfree_skb(skb);
 532 }
 533
 534 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 535 {
 536         struct sk_buff *skb2;
 537         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 538         struct ieee80211_local *local = hw_to_local(hw);
 539         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 540         u16 frag, type;
 541         __le16 fc;
 542         struct ieee80211_tx_status_rtap_hdr *rthdr;
 543         struct ieee80211_sub_if_data *sdata;
 544         struct net_device *prev_dev = NULL;
 545         struct sta_info *sta;
 546
 547         rcu_read_lock();
 548
 549         sta = sta_info_get(local, hdr->addr1);
 550
 551         if (sta) {
 552                 if (info->status.excessive_retries &&
 553                     test_sta_flags(sta, WLAN_STA_PS)) {
 554                         /*
 555                          * The STA is in power save mode, so assume
 556                          * that this TX packet failed because of that.
 557                          */
 558                         ieee80211_handle_filtered_frame(local, sta, skb);
 559                         rcu_read_unlock();
 560                         return;
 561                 }
 562
 563                 fc = hdr->frame_control;
 564
 565                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 566                     (ieee80211_is_data_qos(fc))) {
 567                         u16 tid, ssn;
 568                         u8 *qc;
 569
 570                         qc = ieee80211_get_qos_ctl(hdr);
 571                         tid = qc[0] & 0xf;
 572                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 573                                                 & IEEE80211_SCTL_SEQ);
 574                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 575                                            tid, ssn);
 576                 }
 577
 578                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 579                         ieee80211_handle_filtered_frame(local, sta, skb);
 580                         rcu_read_unlock();
 581                         return;
 582                 } else {
 583                         if (info->status.excessive_retries)
 584                                 sta->tx_retry_failed++;
 585                         sta->tx_retry_count += info->status.retry_count;
 586                 }
 587
 588                 rate_control_tx_status(local->mdev, skb);
 589         }
 590
 591         rcu_read_unlock();
 592
 593         ieee80211_led_tx(local, 0);
 594
 595         /* SNMP counters
 596          * Fragments are passed to low-level drivers as separate skbs, so these
 597          * are actually fragments, not frames. Update frame counters only for
 598          * the first fragment of the frame. */
 599
 600         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 601         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 602
 603         if (info->flags & IEEE80211_TX_STAT_ACK) {
 604                 if (frag == 0) {
 605                         local->dot11TransmittedFrameCount++;
 606                         if (is_multicast_ether_addr(hdr->addr1))
 607                                 local->dot11MulticastTransmittedFrameCount++;
 608                         if (info->status.retry_count > 0)
 609                                 local->dot11RetryCount++;
 610                         if (info->status.retry_count > 1)
 611                                 local->dot11MultipleRetryCount++;
 612                 }
 613
 614                 /* This counter shall be incremented for an acknowledged MPDU
 615                  * with an individual address in the address 1 field or an MPDU
 616                  * with a multicast address in the address 1 field of type Data
 617                  * or Management. */
 618                 if (!is_multicast_ether_addr(hdr->addr1) ||
 619                     type == IEEE80211_FTYPE_DATA ||
 620                     type == IEEE80211_FTYPE_MGMT)
 621                         local->dot11TransmittedFragmentCount++;
 622         } else {
 623                 if (frag == 0)
 624                         local->dot11FailedCount++;
 625         }
 626
 627         /* this was a transmitted frame, but now we want to reuse it */
 628         skb_orphan(skb);
 629
 630         /*
 631          * This is a bit racy but we can avoid a lot of work
 632          * with this test...
 633          */
 634         if (!local->monitors && !local->cooked_mntrs) {
 635                 dev_kfree_skb(skb);
 636                 return;
 637         }
 638
 639         /* send frame to monitor interfaces now */
 640
 641         if (skb_headroom(skb) < sizeof(*rthdr)) {
 642                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 643                 dev_kfree_skb(skb);
 644                 return;
 645         }
 646
 647         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 648                                 skb_push(skb, sizeof(*rthdr));
 649
 650         memset(rthdr, 0, sizeof(*rthdr));
 651         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 652         rthdr->hdr.it_present =
 653                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 654                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 655
 656         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 657             !is_multicast_ether_addr(hdr->addr1))
 658                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 659
 660         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
 661             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
 662                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 663         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
 664                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 665
 666         rthdr->data_retries = info->status.retry_count;
 667
 668         /* XXX: is this sufficient for BPF? */
 669         skb_set_mac_header(skb, 0);
 670         skb->ip_summed = CHECKSUM_UNNECESSARY;
 671         skb->pkt_type = PACKET_OTHERHOST;
 672         skb->protocol = htons(ETH_P_802_2);
 673         memset(skb->cb, 0, sizeof(skb->cb));
 674
 675         rcu_read_lock();
 676         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 677                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 678                         if (!netif_running(sdata->dev))
 679                                 continue;
 680
 681                         if (prev_dev) {
 682                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 683                                 if (skb2) {
 684                                         skb2->dev = prev_dev;
 685                                         netif_rx(skb2);
 686                                 }
 687                         }
 688
 689                         prev_dev = sdata->dev;
 690                 }
 691         }
 692         if (prev_dev) {
 693                 skb->dev = prev_dev;
 694                 netif_rx(skb);
 695                 skb = NULL;
 696         }
 697         rcu_read_unlock();
 698         dev_kfree_skb(skb);
 699 }
 700 EXPORT_SYMBOL(ieee80211_tx_status);
 701
 702 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 703                                         const struct ieee80211_ops *ops)
 704 {
 705         struct ieee80211_local *local;
 706         int priv_size;
 707         struct wiphy *wiphy;
 708
 709         /* Ensure 32-byte alignment of our private data and hw private data.
 710          * We use the wiphy priv data for both our ieee80211_local and for
 711          * the driver's private data
 712          *
 713          * In memory it'll be like this:
 714          *
 715          * +-------------------------+
 716          * | struct wiphy           |
 717          * +-------------------------+
 718          * | struct ieee80211_local  |
 719          * +-------------------------+
 720          * | driver's private data   |
 721          * +-------------------------+
 722          *
 723          */
 724         priv_size = ((sizeof(struct ieee80211_local) +
 725                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 726                     priv_data_len;
 727
 728         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 729
 730         if (!wiphy)
 731                 return NULL;
 732
 733         wiphy->privid = mac80211_wiphy_privid;
 734
 735         local = wiphy_priv(wiphy);
 736         local->hw.wiphy = wiphy;
 737
 738         local->hw.priv = (char *)local +
 739                          ((sizeof(struct ieee80211_local) +
 740                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 741
 742         BUG_ON(!ops->tx);
 743         BUG_ON(!ops->start);
 744         BUG_ON(!ops->stop);
 745         BUG_ON(!ops->config);
 746         BUG_ON(!ops->add_interface);
 747         BUG_ON(!ops->remove_interface);
 748         BUG_ON(!ops->configure_filter);
 749         local->ops = ops;
 750
 751         local->hw.queues = 1; /* default */
 752
 753         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 754         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 755         local->short_retry_limit = 7;
 756         local->long_retry_limit = 4;
 757         local->hw.conf.radio_enabled = 1;
 758
 759         INIT_LIST_HEAD(&local->interfaces);
 760
 761         spin_lock_init(&local->key_lock);
 762
 763         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 764
 765         sta_info_init(local);
 766
 767         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 768                      (unsigned long)local);
 769         tasklet_disable(&local->tx_pending_tasklet);
 770
 771         tasklet_init(&local->tasklet,
 772                      ieee80211_tasklet_handler,
 773                      (unsigned long) local);
 774         tasklet_disable(&local->tasklet);
 775
 776         skb_queue_head_init(&local->skb_queue);
 777         skb_queue_head_init(&local->skb_queue_unreliable);
 778
 779         return local_to_hw(local);
 780 }
 781 EXPORT_SYMBOL(ieee80211_alloc_hw);
 782
 783 int ieee80211_register_hw(struct ieee80211_hw *hw)
 784 {
 785         struct ieee80211_local *local = hw_to_local(hw);
 786         const char *name;
 787         int result;
 788         enum ieee80211_band band;
 789         struct net_device *mdev;
 790         struct wireless_dev *mwdev;
 791
 792         /*
 793          * generic code guarantees at least one band,
 794          * set this very early because much code assumes
 795          * that hw.conf.channel is assigned
 796          */
 797         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 798                 struct ieee80211_supported_band *sband;
 799
 800                 sband = local->hw.wiphy->bands[band];
 801                 if (sband) {
 802                         /* init channel we're on */
 803                         local->hw.conf.channel =
 804                         local->oper_channel =
 805                         local->scan_channel = &sband->channels[0];
 806                         break;
 807                 }
 808         }
 809
 810         /* if low-level driver supports AP, we also support VLAN */
 811         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 812                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 813
 814         /* mac80211 always supports monitor */
 815         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 816
 817         result = wiphy_register(local->hw.wiphy);
 818         if (result < 0)
 819                 return result;
 820
 821         /*
 822          * We use the number of queues for feature tests (QoS, HT) internally
 823          * so restrict them appropriately.
 824          */
 825         if (hw->queues > IEEE80211_MAX_QUEUES)
 826                 hw->queues = IEEE80211_MAX_QUEUES;
 827         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 828                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 829         if (hw->queues < 4)
 830                 hw->ampdu_queues = 0;
 831
 832         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
 833                                "wmaster%d", ether_setup,
 834                                ieee80211_num_queues(hw));
 835         if (!mdev)
 836                 goto fail_mdev_alloc;
 837
 838         mwdev = netdev_priv(mdev);
 839         mdev->ieee80211_ptr = mwdev;
 840         mwdev->wiphy = local->hw.wiphy;
 841
 842         local->mdev = mdev;
 843
 844         ieee80211_rx_bss_list_init(local);
 845
 846         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 847         mdev->open = ieee80211_master_open;
 848         mdev->stop = ieee80211_master_stop;
 849         mdev->type = ARPHRD_IEEE80211;
 850         mdev->header_ops = &ieee80211_header_ops;
 851         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 852
 853         name = wiphy_dev(local->hw.wiphy)->driver->name;
 854         local->hw.workqueue = create_freezeable_workqueue(name);
 855         if (!local->hw.workqueue) {
 856                 result = -ENOMEM;
 857                 goto fail_workqueue;
 858         }
 859
 860         /*
 861          * The hardware needs headroom for sending the frame,
 862          * and we need some headroom for passing the frame to monitor
 863          * interfaces, but never both at the same time.
 864          */
 865         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 866                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 867
 868         debugfs_hw_add(local);
 869
 870         if (local->hw.conf.beacon_int < 10)
 871                 local->hw.conf.beacon_int = 100;
 872
 873         if (local->hw.max_listen_interval == 0)
 874                 local->hw.max_listen_interval = 1;
 875
 876         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 877
 878         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 879                                                   IEEE80211_HW_SIGNAL_DB |
 880                                                   IEEE80211_HW_SIGNAL_DBM) ?
 881                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 882         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 883                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 884         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 885                 local->wstats_flags |= IW_QUAL_DBM;
 886
 887         result = sta_info_start(local);
 888         if (result < 0)
 889                 goto fail_sta_info;
 890
 891         rtnl_lock();
 892         result = dev_alloc_name(local->mdev, local->mdev->name);
 893         if (result < 0)
 894                 goto fail_dev;
 895
 896         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 897         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 898
 899         result = register_netdevice(local->mdev);
 900         if (result < 0)
 901                 goto fail_dev;
 902
 903         result = ieee80211_init_rate_ctrl_alg(local,
 904                                               hw->rate_control_algorithm);
 905         if (result < 0) {
 906                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 907                        "algorithm\n", wiphy_name(local->hw.wiphy));
 908                 goto fail_rate;
 909         }
 910
 911         result = ieee80211_wep_init(local);
 912
 913         if (result < 0) {
 914                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 915                        wiphy_name(local->hw.wiphy), result);
 916                 goto fail_wep;
 917         }
 918
 919         local->mdev->select_queue = ieee80211_select_queue;
 920
 921         /* add one default STA interface */
 922         result = ieee80211_if_add(local, "wlan%d", NULL,
 923                                   NL80211_IFTYPE_STATION, NULL);
 924         if (result)
 925                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 926                        wiphy_name(local->hw.wiphy));
 927
 928         rtnl_unlock();
 929
 930         ieee80211_led_init(local);
 931
 932         return 0;
 933
 934 fail_wep:
 935         rate_control_deinitialize(local);
 936 fail_rate:
 937         unregister_netdevice(local->mdev);
 938         local->mdev = NULL;
 939 fail_dev:
 940         rtnl_unlock();
 941         sta_info_stop(local);
 942 fail_sta_info:
 943         debugfs_hw_del(local);
 944         destroy_workqueue(local->hw.workqueue);
 945 fail_workqueue:
 946         if (local->mdev)
 947                 free_netdev(local->mdev);
 948 fail_mdev_alloc:
 949         wiphy_unregister(local->hw.wiphy);
 950         return result;
 951 }
 952 EXPORT_SYMBOL(ieee80211_register_hw);
 953
 954 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 955 {
 956         struct ieee80211_local *local = hw_to_local(hw);
 957
 958         tasklet_kill(&local->tx_pending_tasklet);
 959         tasklet_kill(&local->tasklet);
 960
 961         rtnl_lock();
 962
 963         /*
 964          * At this point, interface list manipulations are fine
 965          * because the driver cannot be handing us frames any
 966          * more and the tasklet is killed.
 967          */
 968
 969         /* First, we remove all virtual interfaces. */
 970         ieee80211_remove_interfaces(local);
 971
 972         /* then, finally, remove the master interface */
 973         unregister_netdevice(local->mdev);
 974
 975         rtnl_unlock();
 976
 977         ieee80211_rx_bss_list_deinit(local);
 978         ieee80211_clear_tx_pending(local);
 979         sta_info_stop(local);
 980         rate_control_deinitialize(local);
 981         debugfs_hw_del(local);
 982
 983         if (skb_queue_len(&local->skb_queue)
 984                         || skb_queue_len(&local->skb_queue_unreliable))
 985                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 986                        wiphy_name(local->hw.wiphy));
 987         skb_queue_purge(&local->skb_queue);
 988         skb_queue_purge(&local->skb_queue_unreliable);
 989
 990         destroy_workqueue(local->hw.workqueue);
 991         wiphy_unregister(local->hw.wiphy);
 992         ieee80211_wep_free(local);
 993         ieee80211_led_exit(local);
 994         free_netdev(local->mdev);
 995 }
 996 EXPORT_SYMBOL(ieee80211_unregister_hw);
 997
 998 void ieee80211_free_hw(struct ieee80211_hw *hw)
 999 {
1000         struct ieee80211_local *local = hw_to_local(hw);
1001
1002         wiphy_free(local->hw.wiphy);
1003 }
1004 EXPORT_SYMBOL(ieee80211_free_hw);
1005
1006 static int __init ieee80211_init(void)
1007 {
1008         struct sk_buff *skb;
1009         int ret;
1010
1011         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1012         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1013                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1014
1015         ret = rc80211_pid_init();
1016         if (ret)
1017                 return ret;
1018
1019         ieee80211_debugfs_netdev_init();
1020
1021         return 0;
1022 }
1023
1024 static void __exit ieee80211_exit(void)
1025 {
1026         rc80211_pid_exit();
1027
1028         /*
1029          * For key todo, it'll be empty by now but the work
1030          * might still be scheduled.
1031          */
1032         flush_scheduled_work();
1033
1034         if (mesh_allocated)
1035                 ieee80211s_stop();
1036
1037         ieee80211_debugfs_netdev_exit();
1038 }
1039
1040
1041 subsys_initcall(ieee80211_init);
1042 module_exit(ieee80211_exit);
1043
1044 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1045 MODULE_LICENSE("GPL");