net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         u8 rate;
  45         u8 padding_for_rate;
  46         __le16 tx_flags;
  47         u8 data_retries;
  48 } __attribute__ ((packed));
  49
  50
  51 /* must be called under mdev tx lock */
  52 void ieee80211_configure_filter(struct ieee80211_local *local)
  53 {
  54         unsigned int changed_flags;
  55         unsigned int new_flags = 0;
  56
  57         if (atomic_read(&local->iff_promiscs))
  58                 new_flags |= FIF_PROMISC_IN_BSS;
  59
  60         if (atomic_read(&local->iff_allmultis))
  61                 new_flags |= FIF_ALLMULTI;
  62
  63         if (local->monitors)
  64                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  65
  66         if (local->fif_fcsfail)
  67                 new_flags |= FIF_FCSFAIL;
  68
  69         if (local->fif_plcpfail)
  70                 new_flags |= FIF_PLCPFAIL;
  71
  72         if (local->fif_control)
  73                 new_flags |= FIF_CONTROL;
  74
  75         if (local->fif_other_bss)
  76                 new_flags |= FIF_OTHER_BSS;
  77
  78         changed_flags = local->filter_flags ^ new_flags;
  79
  80         /* be a bit nasty */
  81         new_flags |= (1<<31);
  82
  83         local->ops->configure_filter(local_to_hw(local),
  84                                      changed_flags, &new_flags,
  85                                      local->mdev->mc_count,
  86                                      local->mdev->mc_list);
  87
  88         WARN_ON(new_flags & (1<<31));
  89
  90         local->filter_flags = new_flags & ~(1<<31);
  91 }
  92
  93 /* master interface */
  94
  95 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  96 {
  97         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  98         return ETH_ALEN;
  99 }
 100
 101 static const struct header_ops ieee80211_header_ops = {
 102         .create         = eth_header,
 103         .parse          = header_parse_80211,
 104         .rebuild        = eth_rebuild_header,
 105         .cache          = eth_header_cache,
 106         .cache_update   = eth_header_cache_update,
 107 };
 108
 109 static int ieee80211_master_open(struct net_device *dev)
 110 {
 111         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 112         struct ieee80211_local *local = mpriv->local;
 113         struct ieee80211_sub_if_data *sdata;
 114         int res = -EOPNOTSUPP;
 115
 116         /* we hold the RTNL here so can safely walk the list */
 117         list_for_each_entry(sdata, &local->interfaces, list) {
 118                 if (netif_running(sdata->dev)) {
 119                         res = 0;
 120                         break;
 121                 }
 122         }
 123
 124         if (res)
 125                 return res;
 126
 127         netif_tx_start_all_queues(local->mdev);
 128
 129         return 0;
 130 }
 131
 132 static int ieee80211_master_stop(struct net_device *dev)
 133 {
 134         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 135         struct ieee80211_local *local = mpriv->local;
 136         struct ieee80211_sub_if_data *sdata;
 137
 138         /* we hold the RTNL here so can safely walk the list */
 139         list_for_each_entry(sdata, &local->interfaces, list)
 140                 if (netif_running(sdata->dev))
 141                         dev_close(sdata->dev);
 142
 143         return 0;
 144 }
 145
 146 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 147 {
 148         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 149         struct ieee80211_local *local = mpriv->local;
 150
 151         ieee80211_configure_filter(local);
 152 }
 153
 154 /* everything else */
 155
 156 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 157 {
 158         struct ieee80211_local *local = sdata->local;
 159         struct ieee80211_if_conf conf;
 160
 161         if (WARN_ON(!netif_running(sdata->dev)))
 162                 return 0;
 163
 164         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 165                 return -EINVAL;
 166
 167         if (!local->ops->config_interface)
 168                 return 0;
 169
 170         memset(&conf, 0, sizeof(conf));
 171
 172         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 173             sdata->vif.type == NL80211_IFTYPE_ADHOC)
 174                 conf.bssid = sdata->u.sta.bssid;
 175         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 176                 conf.bssid = sdata->dev->dev_addr;
 177         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 178                 static const u8 zero[ETH_ALEN] = { 0 };
 179                 conf.bssid = zero;
 180         } else {
 181                 WARN_ON(1);
 182                 return -EINVAL;
 183         }
 184
 185         switch (sdata->vif.type) {
 186         case NL80211_IFTYPE_AP:
 187         case NL80211_IFTYPE_ADHOC:
 188         case NL80211_IFTYPE_MESH_POINT:
 189                 break;
 190         default:
 191                 /* do not warn to simplify caller in scan.c */
 192                 changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
 193                 if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
 194                         return -EINVAL;
 195                 changed &= ~IEEE80211_IFCC_BEACON;
 196                 break;
 197         }
 198
 199         if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
 200                 if (local->sw_scanning) {
 201                         conf.enable_beacon = false;
 202                 } else {
 203                         /*
 204                          * Beacon should be enabled, but AP mode must
 205                          * check whether there is a beacon configured.
 206                          */
 207                         switch (sdata->vif.type) {
 208                         case NL80211_IFTYPE_AP:
 209                                 conf.enable_beacon =
 210                                         !!rcu_dereference(sdata->u.ap.beacon);
 211                                 break;
 212                         case NL80211_IFTYPE_ADHOC:
 213                                 conf.enable_beacon = !!sdata->u.sta.probe_resp;
 214                                 break;
 215                         case NL80211_IFTYPE_MESH_POINT:
 216                                 conf.enable_beacon = true;
 217                                 break;
 218                         default:
 219                                 /* not reached */
 220                                 WARN_ON(1);
 221                                 break;
 222                         }
 223                 }
 224         }
 225
 226         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 227                 return -EINVAL;
 228
 229         conf.changed = changed;
 230
 231         return local->ops->config_interface(local_to_hw(local),
 232                                             &sdata->vif, &conf);
 233 }
 234
 235 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 236 {
 237         struct ieee80211_channel *chan;
 238         int ret = 0;
 239         int power;
 240         enum nl80211_channel_type channel_type;
 241
 242         might_sleep();
 243
 244         if (local->sw_scanning) {
 245                 chan = local->scan_channel;
 246                 channel_type = NL80211_CHAN_NO_HT;
 247         } else {
 248                 chan = local->oper_channel;
 249                 channel_type = local->oper_channel_type;
 250         }
 251
 252         if (chan != local->hw.conf.channel ||
 253             channel_type != local->hw.conf.channel_type) {
 254                 local->hw.conf.channel = chan;
 255                 local->hw.conf.channel_type = channel_type;
 256                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 257         }
 258
 259         if (local->sw_scanning)
 260                 power = chan->max_power;
 261         else
 262                 power = local->power_constr_level ?
 263                         (chan->max_power - local->power_constr_level) :
 264                         chan->max_power;
 265
 266         if (local->user_power_level)
 267                 power = min(power, local->user_power_level);
 268
 269         if (local->hw.conf.power_level != power) {
 270                 changed |= IEEE80211_CONF_CHANGE_POWER;
 271                 local->hw.conf.power_level = power;
 272         }
 273
 274         if (changed && local->open_count) {
 275                 ret = local->ops->config(local_to_hw(local), changed);
 276                 /*
 277                  * Goal:
 278                  * HW reconfiguration should never fail, the driver has told
 279                  * us what it can support so it should live up to that promise.
 280                  *
 281                  * Current status:
 282                  * rfkill is not integrated with mac80211 and a
 283                  * configuration command can thus fail if hardware rfkill
 284                  * is enabled
 285                  *
 286                  * FIXME: integrate rfkill with mac80211 and then add this
 287                  * WARN_ON() back
 288                  *
 289                  */
 290                 /* WARN_ON(ret); */
 291         }
 292
 293         return ret;
 294 }
 295
 296 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 297                                       u32 changed)
 298 {
 299         struct ieee80211_local *local = sdata->local;
 300
 301         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 302                 return;
 303
 304         if (!changed)
 305                 return;
 306
 307         if (local->ops->bss_info_changed)
 308                 local->ops->bss_info_changed(local_to_hw(local),
 309                                              &sdata->vif,
 310                                              &sdata->vif.bss_conf,
 311                                              changed);
 312 }
 313
 314 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 315 {
 316         sdata->vif.bss_conf.use_cts_prot = false;
 317         sdata->vif.bss_conf.use_short_preamble = false;
 318         sdata->vif.bss_conf.use_short_slot = false;
 319         return BSS_CHANGED_ERP_CTS_PROT |
 320                BSS_CHANGED_ERP_PREAMBLE |
 321                BSS_CHANGED_ERP_SLOT;
 322 }
 323
 324 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 325                                  struct sk_buff *skb)
 326 {
 327         struct ieee80211_local *local = hw_to_local(hw);
 328         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 329         int tmp;
 330
 331         skb->dev = local->mdev;
 332         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 333         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 334                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 335         tmp = skb_queue_len(&local->skb_queue) +
 336                 skb_queue_len(&local->skb_queue_unreliable);
 337         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 338                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 339                 dev_kfree_skb_irq(skb);
 340                 tmp--;
 341                 I802_DEBUG_INC(local->tx_status_drop);
 342         }
 343         tasklet_schedule(&local->tasklet);
 344 }
 345 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 346
 347 static void ieee80211_tasklet_handler(unsigned long data)
 348 {
 349         struct ieee80211_local *local = (struct ieee80211_local *) data;
 350         struct sk_buff *skb;
 351         struct ieee80211_rx_status rx_status;
 352         struct ieee80211_ra_tid *ra_tid;
 353
 354         while ((skb = skb_dequeue(&local->skb_queue)) ||
 355                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 356                 switch (skb->pkt_type) {
 357                 case IEEE80211_RX_MSG:
 358                         /* status is in skb->cb */
 359                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 360                         /* Clear skb->pkt_type in order to not confuse kernel
 361                          * netstack. */
 362                         skb->pkt_type = 0;
 363                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 364                         break;
 365                 case IEEE80211_TX_STATUS_MSG:
 366                         skb->pkt_type = 0;
 367                         ieee80211_tx_status(local_to_hw(local), skb);
 368                         break;
 369                 case IEEE80211_DELBA_MSG:
 370                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 371                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 372                                                 ra_tid->ra, ra_tid->tid);
 373                         dev_kfree_skb(skb);
 374                         break;
 375                 case IEEE80211_ADDBA_MSG:
 376                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 377                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 378                                                  ra_tid->ra, ra_tid->tid);
 379                         dev_kfree_skb(skb);
 380                         break ;
 381                 default:
 382                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 383                              skb->pkt_type);
 384                         dev_kfree_skb(skb);
 385                         break;
 386                 }
 387         }
 388 }
 389
 390 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 391  * make a prepared TX frame (one that has been given to hw) to look like brand
 392  * new IEEE 802.11 frame that is ready to go through TX processing again.
 393  */
 394 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 395                                       struct ieee80211_key *key,
 396                                       struct sk_buff *skb)
 397 {
 398         unsigned int hdrlen, iv_len, mic_len;
 399         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 400
 401         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 402
 403         if (!key)
 404                 goto no_key;
 405
 406         switch (key->conf.alg) {
 407         case ALG_WEP:
 408                 iv_len = WEP_IV_LEN;
 409                 mic_len = WEP_ICV_LEN;
 410                 break;
 411         case ALG_TKIP:
 412                 iv_len = TKIP_IV_LEN;
 413                 mic_len = TKIP_ICV_LEN;
 414                 break;
 415         case ALG_CCMP:
 416                 iv_len = CCMP_HDR_LEN;
 417                 mic_len = CCMP_MIC_LEN;
 418                 break;
 419         default:
 420                 goto no_key;
 421         }
 422
 423         if (skb->len >= hdrlen + mic_len &&
 424             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 425                 skb_trim(skb, skb->len - mic_len);
 426         if (skb->len >= hdrlen + iv_len) {
 427                 memmove(skb->data + iv_len, skb->data, hdrlen);
 428                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 429         }
 430
 431 no_key:
 432         if (ieee80211_is_data_qos(hdr->frame_control)) {
 433                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 434                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 435                         hdrlen - IEEE80211_QOS_CTL_LEN);
 436                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 437         }
 438 }
 439
 440 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 441                                             struct sta_info *sta,
 442                                             struct sk_buff *skb)
 443 {
 444         sta->tx_filtered_count++;
 445
 446         /*
 447          * Clear the TX filter mask for this STA when sending the next
 448          * packet. If the STA went to power save mode, this will happen
 449          * when it wakes up for the next time.
 450          */
 451         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 452
 453         /*
 454          * This code races in the following way:
 455          *
 456          *  (1) STA sends frame indicating it will go to sleep and does so
 457          *  (2) hardware/firmware adds STA to filter list, passes frame up
 458          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 459          *  (4) we get TX status before having processed the frame and
 460          *      knowing that the STA has gone to sleep.
 461          *
 462          * This is actually quite unlikely even when both those events are
 463          * processed from interrupts coming in quickly after one another or
 464          * even at the same time because we queue both TX status events and
 465          * RX frames to be processed by a tasklet and process them in the
 466          * same order that they were received or TX status last. Hence, there
 467          * is no race as long as the frame RX is processed before the next TX
 468          * status, which drivers can ensure, see below.
 469          *
 470          * Note that this can only happen if the hardware or firmware can
 471          * actually add STAs to the filter list, if this is done by the
 472          * driver in response to set_tim() (which will only reduce the race
 473          * this whole filtering tries to solve, not completely solve it)
 474          * this situation cannot happen.
 475          *
 476          * To completely solve this race drivers need to make sure that they
 477          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 478          *      functions and
 479          *  (b) always process RX events before TX status events if ordering
 480          *      can be unknown, for example with different interrupt status
 481          *      bits.
 482          */
 483         if (test_sta_flags(sta, WLAN_STA_PS) &&
 484             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 485                 ieee80211_remove_tx_extra(local, sta->key, skb);
 486                 skb_queue_tail(&sta->tx_filtered, skb);
 487                 return;
 488         }
 489
 490         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 491                 /* Software retry the packet once */
 492                 skb->requeue = 1;
 493                 ieee80211_remove_tx_extra(local, sta->key, skb);
 494                 dev_queue_xmit(skb);
 495                 return;
 496         }
 497
 498 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 499         if (net_ratelimit())
 500                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 501                        "queue_len=%d PS=%d @%lu\n",
 502                        wiphy_name(local->hw.wiphy),
 503                        skb_queue_len(&sta->tx_filtered),
 504                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 505 #endif
 506         dev_kfree_skb(skb);
 507 }
 508
 509 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 510 {
 511         struct sk_buff *skb2;
 512         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 513         struct ieee80211_local *local = hw_to_local(hw);
 514         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 515         u16 frag, type;
 516         __le16 fc;
 517         struct ieee80211_supported_band *sband;
 518         struct ieee80211_tx_status_rtap_hdr *rthdr;
 519         struct ieee80211_sub_if_data *sdata;
 520         struct net_device *prev_dev = NULL;
 521         struct sta_info *sta;
 522         int retry_count = -1, i;
 523
 524         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 525                 /* the HW cannot have attempted that rate */
 526                 if (i >= hw->max_rates) {
 527                         info->status.rates[i].idx = -1;
 528                         info->status.rates[i].count = 0;
 529                 }
 530
 531                 retry_count += info->status.rates[i].count;
 532         }
 533         if (retry_count < 0)
 534                 retry_count = 0;
 535
 536         rcu_read_lock();
 537
 538         sband = local->hw.wiphy->bands[info->band];
 539
 540         sta = sta_info_get(local, hdr->addr1);
 541
 542         if (sta) {
 543                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 544                     test_sta_flags(sta, WLAN_STA_PS)) {
 545                         /*
 546                          * The STA is in power save mode, so assume
 547                          * that this TX packet failed because of that.
 548                          */
 549                         ieee80211_handle_filtered_frame(local, sta, skb);
 550                         rcu_read_unlock();
 551                         return;
 552                 }
 553
 554                 fc = hdr->frame_control;
 555
 556                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 557                     (ieee80211_is_data_qos(fc))) {
 558                         u16 tid, ssn;
 559                         u8 *qc;
 560
 561                         qc = ieee80211_get_qos_ctl(hdr);
 562                         tid = qc[0] & 0xf;
 563                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 564                                                 & IEEE80211_SCTL_SEQ);
 565                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 566                                            tid, ssn);
 567                 }
 568
 569                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 570                         ieee80211_handle_filtered_frame(local, sta, skb);
 571                         rcu_read_unlock();
 572                         return;
 573                 } else {
 574                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 575                                 sta->tx_retry_failed++;
 576                         sta->tx_retry_count += retry_count;
 577                 }
 578
 579                 rate_control_tx_status(local, sband, sta, skb);
 580         }
 581
 582         rcu_read_unlock();
 583
 584         ieee80211_led_tx(local, 0);
 585
 586         /* SNMP counters
 587          * Fragments are passed to low-level drivers as separate skbs, so these
 588          * are actually fragments, not frames. Update frame counters only for
 589          * the first fragment of the frame. */
 590
 591         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 592         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 593
 594         if (info->flags & IEEE80211_TX_STAT_ACK) {
 595                 if (frag == 0) {
 596                         local->dot11TransmittedFrameCount++;
 597                         if (is_multicast_ether_addr(hdr->addr1))
 598                                 local->dot11MulticastTransmittedFrameCount++;
 599                         if (retry_count > 0)
 600                                 local->dot11RetryCount++;
 601                         if (retry_count > 1)
 602                                 local->dot11MultipleRetryCount++;
 603                 }
 604
 605                 /* This counter shall be incremented for an acknowledged MPDU
 606                  * with an individual address in the address 1 field or an MPDU
 607                  * with a multicast address in the address 1 field of type Data
 608                  * or Management. */
 609                 if (!is_multicast_ether_addr(hdr->addr1) ||
 610                     type == IEEE80211_FTYPE_DATA ||
 611                     type == IEEE80211_FTYPE_MGMT)
 612                         local->dot11TransmittedFragmentCount++;
 613         } else {
 614                 if (frag == 0)
 615                         local->dot11FailedCount++;
 616         }
 617
 618         /* this was a transmitted frame, but now we want to reuse it */
 619         skb_orphan(skb);
 620
 621         /*
 622          * This is a bit racy but we can avoid a lot of work
 623          * with this test...
 624          */
 625         if (!local->monitors && !local->cooked_mntrs) {
 626                 dev_kfree_skb(skb);
 627                 return;
 628         }
 629
 630         /* send frame to monitor interfaces now */
 631
 632         if (skb_headroom(skb) < sizeof(*rthdr)) {
 633                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 634                 dev_kfree_skb(skb);
 635                 return;
 636         }
 637
 638         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 639                                 skb_push(skb, sizeof(*rthdr));
 640
 641         memset(rthdr, 0, sizeof(*rthdr));
 642         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 643         rthdr->hdr.it_present =
 644                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 645                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 646                             (1 << IEEE80211_RADIOTAP_RATE));
 647
 648         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 649             !is_multicast_ether_addr(hdr->addr1))
 650                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 651
 652         /*
 653          * XXX: Once radiotap gets the bitmap reset thing the vendor
 654          *      extensions proposal contains, we can actually report
 655          *      the whole set of tries we did.
 656          */
 657         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 658             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 659                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 660         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 661                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 662         if (info->status.rates[0].idx >= 0 &&
 663             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 664                 rthdr->rate = sband->bitrates[
 665                                 info->status.rates[0].idx].bitrate / 5;
 666
 667         /* for now report the total retry_count */
 668         rthdr->data_retries = retry_count;
 669
 670         /* XXX: is this sufficient for BPF? */
 671         skb_set_mac_header(skb, 0);
 672         skb->ip_summed = CHECKSUM_UNNECESSARY;
 673         skb->pkt_type = PACKET_OTHERHOST;
 674         skb->protocol = htons(ETH_P_802_2);
 675         memset(skb->cb, 0, sizeof(skb->cb));
 676
 677         rcu_read_lock();
 678         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 679                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 680                         if (!netif_running(sdata->dev))
 681                                 continue;
 682
 683                         if (prev_dev) {
 684                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 685                                 if (skb2) {
 686                                         skb2->dev = prev_dev;
 687                                         netif_rx(skb2);
 688                                 }
 689                         }
 690
 691                         prev_dev = sdata->dev;
 692                 }
 693         }
 694         if (prev_dev) {
 695                 skb->dev = prev_dev;
 696                 netif_rx(skb);
 697                 skb = NULL;
 698         }
 699         rcu_read_unlock();
 700         dev_kfree_skb(skb);
 701 }
 702 EXPORT_SYMBOL(ieee80211_tx_status);
 703
 704 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 705                                         const struct ieee80211_ops *ops)
 706 {
 707         struct ieee80211_local *local;
 708         int priv_size;
 709         struct wiphy *wiphy;
 710
 711         /* Ensure 32-byte alignment of our private data and hw private data.
 712          * We use the wiphy priv data for both our ieee80211_local and for
 713          * the driver's private data
 714          *
 715          * In memory it'll be like this:
 716          *
 717          * +-------------------------+
 718          * | struct wiphy           |
 719          * +-------------------------+
 720          * | struct ieee80211_local  |
 721          * +-------------------------+
 722          * | driver's private data   |
 723          * +-------------------------+
 724          *
 725          */
 726         priv_size = ((sizeof(struct ieee80211_local) +
 727                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 728                     priv_data_len;
 729
 730         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 731
 732         if (!wiphy)
 733                 return NULL;
 734
 735         wiphy->privid = mac80211_wiphy_privid;
 736         wiphy->max_scan_ssids = 4;
 737         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 738         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 739                                sizeof(struct cfg80211_bss);
 740
 741         local = wiphy_priv(wiphy);
 742         local->hw.wiphy = wiphy;
 743
 744         local->hw.priv = (char *)local +
 745                          ((sizeof(struct ieee80211_local) +
 746                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 747
 748         BUG_ON(!ops->tx);
 749         BUG_ON(!ops->start);
 750         BUG_ON(!ops->stop);
 751         BUG_ON(!ops->config);
 752         BUG_ON(!ops->add_interface);
 753         BUG_ON(!ops->remove_interface);
 754         BUG_ON(!ops->configure_filter);
 755         local->ops = ops;
 756
 757         /* set up some defaults */
 758         local->hw.queues = 1;
 759         local->hw.max_rates = 1;
 760         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 761         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 762         local->hw.conf.long_frame_max_tx_count = 4;
 763         local->hw.conf.short_frame_max_tx_count = 7;
 764         local->hw.conf.radio_enabled = true;
 765
 766         INIT_LIST_HEAD(&local->interfaces);
 767         mutex_init(&local->iflist_mtx);
 768
 769         spin_lock_init(&local->key_lock);
 770
 771         spin_lock_init(&local->queue_stop_reason_lock);
 772
 773         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 774
 775         INIT_WORK(&local->dynamic_ps_enable_work,
 776                   ieee80211_dynamic_ps_enable_work);
 777         INIT_WORK(&local->dynamic_ps_disable_work,
 778                   ieee80211_dynamic_ps_disable_work);
 779         setup_timer(&local->dynamic_ps_timer,
 780                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 781
 782         sta_info_init(local);
 783
 784         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 785                      (unsigned long)local);
 786         tasklet_disable(&local->tx_pending_tasklet);
 787
 788         tasklet_init(&local->tasklet,
 789                      ieee80211_tasklet_handler,
 790                      (unsigned long) local);
 791         tasklet_disable(&local->tasklet);
 792
 793         skb_queue_head_init(&local->skb_queue);
 794         skb_queue_head_init(&local->skb_queue_unreliable);
 795
 796         return local_to_hw(local);
 797 }
 798 EXPORT_SYMBOL(ieee80211_alloc_hw);
 799
 800 static const struct net_device_ops ieee80211_master_ops = {
 801         .ndo_start_xmit = ieee80211_master_start_xmit,
 802         .ndo_open = ieee80211_master_open,
 803         .ndo_stop = ieee80211_master_stop,
 804         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 805         .ndo_select_queue = ieee80211_select_queue,
 806 };
 807
 808 static void ieee80211_master_setup(struct net_device *mdev)
 809 {
 810         mdev->type = ARPHRD_IEEE80211;
 811         mdev->netdev_ops = &ieee80211_master_ops;
 812         mdev->header_ops = &ieee80211_header_ops;
 813         mdev->tx_queue_len = 1000;
 814         mdev->addr_len = ETH_ALEN;
 815 }
 816
 817 int ieee80211_register_hw(struct ieee80211_hw *hw)
 818 {
 819         struct ieee80211_local *local = hw_to_local(hw);
 820         int result;
 821         enum ieee80211_band band;
 822         struct net_device *mdev;
 823         struct ieee80211_master_priv *mpriv;
 824         int channels, i, j;
 825
 826         /*
 827          * generic code guarantees at least one band,
 828          * set this very early because much code assumes
 829          * that hw.conf.channel is assigned
 830          */
 831         channels = 0;
 832         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 833                 struct ieee80211_supported_band *sband;
 834
 835                 sband = local->hw.wiphy->bands[band];
 836                 if (sband && !local->oper_channel) {
 837                         /* init channel we're on */
 838                         local->hw.conf.channel =
 839                         local->oper_channel =
 840                         local->scan_channel = &sband->channels[0];
 841                 }
 842                 if (sband)
 843                         channels += sband->n_channels;
 844         }
 845
 846         local->int_scan_req.n_channels = channels;
 847         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 848         if (!local->int_scan_req.channels)
 849                 return -ENOMEM;
 850
 851         /* if low-level driver supports AP, we also support VLAN */
 852         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 853                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 854
 855         /* mac80211 always supports monitor */
 856         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 857
 858         result = wiphy_register(local->hw.wiphy);
 859         if (result < 0)
 860                 goto fail_wiphy_register;
 861
 862         /*
 863          * We use the number of queues for feature tests (QoS, HT) internally
 864          * so restrict them appropriately.
 865          */
 866         if (hw->queues > IEEE80211_MAX_QUEUES)
 867                 hw->queues = IEEE80211_MAX_QUEUES;
 868         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 869                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 870         if (hw->queues < 4)
 871                 hw->ampdu_queues = 0;
 872
 873         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 874                                "wmaster%d", ieee80211_master_setup,
 875                                ieee80211_num_queues(hw));
 876         if (!mdev)
 877                 goto fail_mdev_alloc;
 878
 879         mpriv = netdev_priv(mdev);
 880         mpriv->local = local;
 881         local->mdev = mdev;
 882
 883         local->hw.workqueue =
 884                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 885         if (!local->hw.workqueue) {
 886                 result = -ENOMEM;
 887                 goto fail_workqueue;
 888         }
 889
 890         /*
 891          * The hardware needs headroom for sending the frame,
 892          * and we need some headroom for passing the frame to monitor
 893          * interfaces, but never both at the same time.
 894          */
 895         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 896                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 897
 898         debugfs_hw_add(local);
 899
 900         if (local->hw.conf.beacon_int < 10)
 901                 local->hw.conf.beacon_int = 100;
 902
 903         if (local->hw.max_listen_interval == 0)
 904                 local->hw.max_listen_interval = 1;
 905
 906         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 907
 908         result = sta_info_start(local);
 909         if (result < 0)
 910                 goto fail_sta_info;
 911
 912         rtnl_lock();
 913         result = dev_alloc_name(local->mdev, local->mdev->name);
 914         if (result < 0)
 915                 goto fail_dev;
 916
 917         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 918         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 919
 920         result = register_netdevice(local->mdev);
 921         if (result < 0)
 922                 goto fail_dev;
 923
 924         result = ieee80211_init_rate_ctrl_alg(local,
 925                                               hw->rate_control_algorithm);
 926         if (result < 0) {
 927                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 928                        "algorithm\n", wiphy_name(local->hw.wiphy));
 929                 goto fail_rate;
 930         }
 931
 932         result = ieee80211_wep_init(local);
 933
 934         if (result < 0) {
 935                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 936                        wiphy_name(local->hw.wiphy), result);
 937                 goto fail_wep;
 938         }
 939
 940         /* add one default STA interface if supported */
 941         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 942                 result = ieee80211_if_add(local, "wlan%d", NULL,
 943                                           NL80211_IFTYPE_STATION, NULL);
 944                 if (result)
 945                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 946                                wiphy_name(local->hw.wiphy));
 947         }
 948
 949         rtnl_unlock();
 950
 951         ieee80211_led_init(local);
 952
 953         /* alloc internal scan request */
 954         i = 0;
 955         local->int_scan_req.ssids = &local->scan_ssid;
 956         local->int_scan_req.n_ssids = 1;
 957         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 958                 if (!hw->wiphy->bands[band])
 959                         continue;
 960                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 961                         local->int_scan_req.channels[i] =
 962                                 &hw->wiphy->bands[band]->channels[j];
 963                         i++;
 964                 }
 965         }
 966
 967         return 0;
 968
 969 fail_wep:
 970         rate_control_deinitialize(local);
 971 fail_rate:
 972         unregister_netdevice(local->mdev);
 973         local->mdev = NULL;
 974 fail_dev:
 975         rtnl_unlock();
 976         sta_info_stop(local);
 977 fail_sta_info:
 978         debugfs_hw_del(local);
 979         destroy_workqueue(local->hw.workqueue);
 980 fail_workqueue:
 981         if (local->mdev)
 982                 free_netdev(local->mdev);
 983 fail_mdev_alloc:
 984         wiphy_unregister(local->hw.wiphy);
 985 fail_wiphy_register:
 986         kfree(local->int_scan_req.channels);
 987         return result;
 988 }
 989 EXPORT_SYMBOL(ieee80211_register_hw);
 990
 991 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 992 {
 993         struct ieee80211_local *local = hw_to_local(hw);
 994
 995         tasklet_kill(&local->tx_pending_tasklet);
 996         tasklet_kill(&local->tasklet);
 997
 998         rtnl_lock();
 999
1000         /*
1001          * At this point, interface list manipulations are fine
1002          * because the driver cannot be handing us frames any
1003          * more and the tasklet is killed.
1004          */
1005
1006         /* First, we remove all virtual interfaces. */
1007         ieee80211_remove_interfaces(local);
1008
1009         /* then, finally, remove the master interface */
1010         unregister_netdevice(local->mdev);
1011
1012         rtnl_unlock();
1013
1014         ieee80211_clear_tx_pending(local);
1015         sta_info_stop(local);
1016         rate_control_deinitialize(local);
1017         debugfs_hw_del(local);
1018
1019         if (skb_queue_len(&local->skb_queue)
1020                         || skb_queue_len(&local->skb_queue_unreliable))
1021                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1022                        wiphy_name(local->hw.wiphy));
1023         skb_queue_purge(&local->skb_queue);
1024         skb_queue_purge(&local->skb_queue_unreliable);
1025
1026         destroy_workqueue(local->hw.workqueue);
1027         wiphy_unregister(local->hw.wiphy);
1028         ieee80211_wep_free(local);
1029         ieee80211_led_exit(local);
1030         free_netdev(local->mdev);
1031         kfree(local->int_scan_req.channels);
1032 }
1033 EXPORT_SYMBOL(ieee80211_unregister_hw);
1034
1035 void ieee80211_free_hw(struct ieee80211_hw *hw)
1036 {
1037         struct ieee80211_local *local = hw_to_local(hw);
1038
1039         mutex_destroy(&local->iflist_mtx);
1040
1041         wiphy_free(local->hw.wiphy);
1042 }
1043 EXPORT_SYMBOL(ieee80211_free_hw);
1044
1045 static int __init ieee80211_init(void)
1046 {
1047         struct sk_buff *skb;
1048         int ret;
1049
1050         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1051         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1052                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1053
1054         ret = rc80211_minstrel_init();
1055         if (ret)
1056                 return ret;
1057
1058         ret = rc80211_pid_init();
1059         if (ret)
1060                 return ret;
1061
1062         ieee80211_debugfs_netdev_init();
1063
1064         return 0;
1065 }
1066
1067 static void __exit ieee80211_exit(void)
1068 {
1069         rc80211_pid_exit();
1070         rc80211_minstrel_exit();
1071
1072         /*
1073          * For key todo, it'll be empty by now but the work
1074          * might still be scheduled.
1075          */
1076         flush_scheduled_work();
1077
1078         if (mesh_allocated)
1079                 ieee80211s_stop();
1080
1081         ieee80211_debugfs_netdev_exit();
1082 }
1083
1084
1085 subsys_initcall(ieee80211_init);
1086 module_exit(ieee80211_exit);
1087
1088 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1089 MODULE_LICENSE("GPL");