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 <linux/pm_qos_params.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wme.h"
  33 #include "aes_ccm.h"
  34 #include "led.h"
  35 #include "cfg.h"
  36 #include "debugfs.h"
  37 #include "debugfs_netdev.h"
  38
  39 /*
  40  * For seeing transmitted packets on monitor interfaces
  41  * we have a radiotap header too.
  42  */
  43 struct ieee80211_tx_status_rtap_hdr {
  44         struct ieee80211_radiotap_header hdr;
  45         u8 rate;
  46         u8 padding_for_rate;
  47         __le16 tx_flags;
  48         u8 data_retries;
  49 } __attribute__ ((packed));
  50
  51
  52 /* must be called under mdev tx lock */
  53 void ieee80211_configure_filter(struct ieee80211_local *local)
  54 {
  55         unsigned int changed_flags;
  56         unsigned int new_flags = 0;
  57
  58         if (atomic_read(&local->iff_promiscs))
  59                 new_flags |= FIF_PROMISC_IN_BSS;
  60
  61         if (atomic_read(&local->iff_allmultis))
  62                 new_flags |= FIF_ALLMULTI;
  63
  64         if (local->monitors)
  65                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  66
  67         if (local->fif_fcsfail)
  68                 new_flags |= FIF_FCSFAIL;
  69
  70         if (local->fif_plcpfail)
  71                 new_flags |= FIF_PLCPFAIL;
  72
  73         if (local->fif_control)
  74                 new_flags |= FIF_CONTROL;
  75
  76         if (local->fif_other_bss)
  77                 new_flags |= FIF_OTHER_BSS;
  78
  79         changed_flags = local->filter_flags ^ new_flags;
  80
  81         /* be a bit nasty */
  82         new_flags |= (1<<31);
  83
  84         local->ops->configure_filter(local_to_hw(local),
  85                                      changed_flags, &new_flags,
  86                                      local->mdev->mc_count,
  87                                      local->mdev->mc_list);
  88
  89         WARN_ON(new_flags & (1<<31));
  90
  91         local->filter_flags = new_flags & ~(1<<31);
  92 }
  93
  94 /* master interface */
  95
  96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  97 {
  98         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  99         return ETH_ALEN;
 100 }
 101
 102 static const struct header_ops ieee80211_header_ops = {
 103         .create         = eth_header,
 104         .parse          = header_parse_80211,
 105         .rebuild        = eth_rebuild_header,
 106         .cache          = eth_header_cache,
 107         .cache_update   = eth_header_cache_update,
 108 };
 109
 110 static int ieee80211_master_open(struct net_device *dev)
 111 {
 112         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 113         struct ieee80211_local *local = mpriv->local;
 114         struct ieee80211_sub_if_data *sdata;
 115         int res = -EOPNOTSUPP;
 116
 117         /* we hold the RTNL here so can safely walk the list */
 118         list_for_each_entry(sdata, &local->interfaces, list) {
 119                 if (netif_running(sdata->dev)) {
 120                         res = 0;
 121                         break;
 122                 }
 123         }
 124
 125         if (res)
 126                 return res;
 127
 128         netif_tx_start_all_queues(local->mdev);
 129
 130         return 0;
 131 }
 132
 133 static int ieee80211_master_stop(struct net_device *dev)
 134 {
 135         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 136         struct ieee80211_local *local = mpriv->local;
 137         struct ieee80211_sub_if_data *sdata;
 138
 139         /* we hold the RTNL here so can safely walk the list */
 140         list_for_each_entry(sdata, &local->interfaces, list)
 141                 if (netif_running(sdata->dev))
 142                         dev_close(sdata->dev);
 143
 144         return 0;
 145 }
 146
 147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 148 {
 149         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 150         struct ieee80211_local *local = mpriv->local;
 151
 152         ieee80211_configure_filter(local);
 153 }
 154
 155 /* everything else */
 156
 157 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 158 {
 159         struct ieee80211_local *local = sdata->local;
 160         struct ieee80211_if_conf conf;
 161
 162         if (WARN_ON(!netif_running(sdata->dev)))
 163                 return 0;
 164
 165         memset(&conf, 0, sizeof(conf));
 166
 167         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 168                 conf.bssid = sdata->u.mgd.bssid;
 169         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 170                 conf.bssid = sdata->u.ibss.bssid;
 171         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 172                 conf.bssid = sdata->dev->dev_addr;
 173         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 174                 static const u8 zero[ETH_ALEN] = { 0 };
 175                 conf.bssid = zero;
 176         } else {
 177                 WARN_ON(1);
 178                 return -EINVAL;
 179         }
 180
 181         if (!local->ops->config_interface)
 182                 return 0;
 183
 184         switch (sdata->vif.type) {
 185         case NL80211_IFTYPE_AP:
 186         case NL80211_IFTYPE_ADHOC:
 187         case NL80211_IFTYPE_MESH_POINT:
 188                 break;
 189         default:
 190                 /* do not warn to simplify caller in scan.c */
 191                 changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
 192                 if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
 193                         return -EINVAL;
 194                 changed &= ~IEEE80211_IFCC_BEACON;
 195                 break;
 196         }
 197
 198         if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
 199                 if (local->sw_scanning) {
 200                         conf.enable_beacon = false;
 201                 } else {
 202                         /*
 203                          * Beacon should be enabled, but AP mode must
 204                          * check whether there is a beacon configured.
 205                          */
 206                         switch (sdata->vif.type) {
 207                         case NL80211_IFTYPE_AP:
 208                                 conf.enable_beacon =
 209                                         !!rcu_dereference(sdata->u.ap.beacon);
 210                                 break;
 211                         case NL80211_IFTYPE_ADHOC:
 212                                 conf.enable_beacon = !!sdata->u.ibss.presp;
 213                                 break;
 214                         case NL80211_IFTYPE_MESH_POINT:
 215                                 conf.enable_beacon = true;
 216                                 break;
 217                         default:
 218                                 /* not reached */
 219                                 WARN_ON(1);
 220                                 break;
 221                         }
 222                 }
 223         }
 224
 225         conf.changed = changed;
 226
 227         return local->ops->config_interface(local_to_hw(local),
 228                                             &sdata->vif, &conf);
 229 }
 230
 231 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 232 {
 233         struct ieee80211_channel *chan;
 234         int ret = 0;
 235         int power;
 236         enum nl80211_channel_type channel_type;
 237
 238         might_sleep();
 239
 240         if (local->sw_scanning) {
 241                 chan = local->scan_channel;
 242                 channel_type = NL80211_CHAN_NO_HT;
 243         } else {
 244                 chan = local->oper_channel;
 245                 channel_type = local->oper_channel_type;
 246         }
 247
 248         if (chan != local->hw.conf.channel ||
 249             channel_type != local->hw.conf.channel_type) {
 250                 local->hw.conf.channel = chan;
 251                 local->hw.conf.channel_type = channel_type;
 252                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 253         }
 254
 255         if (local->sw_scanning)
 256                 power = chan->max_power;
 257         else
 258                 power = local->power_constr_level ?
 259                         (chan->max_power - local->power_constr_level) :
 260                         chan->max_power;
 261
 262         if (local->user_power_level >= 0)
 263                 power = min(power, local->user_power_level);
 264
 265         if (local->hw.conf.power_level != power) {
 266                 changed |= IEEE80211_CONF_CHANGE_POWER;
 267                 local->hw.conf.power_level = power;
 268         }
 269
 270         if (changed && local->open_count) {
 271                 ret = local->ops->config(local_to_hw(local), changed);
 272                 /*
 273                  * Goal:
 274                  * HW reconfiguration should never fail, the driver has told
 275                  * us what it can support so it should live up to that promise.
 276                  *
 277                  * Current status:
 278                  * rfkill is not integrated with mac80211 and a
 279                  * configuration command can thus fail if hardware rfkill
 280                  * is enabled
 281                  *
 282                  * FIXME: integrate rfkill with mac80211 and then add this
 283                  * WARN_ON() back
 284                  *
 285                  */
 286                 /* WARN_ON(ret); */
 287         }
 288
 289         return ret;
 290 }
 291
 292 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 293                                       u32 changed)
 294 {
 295         struct ieee80211_local *local = sdata->local;
 296
 297         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 298                 return;
 299
 300         if (!changed)
 301                 return;
 302
 303         if (local->ops->bss_info_changed)
 304                 local->ops->bss_info_changed(local_to_hw(local),
 305                                              &sdata->vif,
 306                                              &sdata->vif.bss_conf,
 307                                              changed);
 308 }
 309
 310 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 311 {
 312         sdata->vif.bss_conf.use_cts_prot = false;
 313         sdata->vif.bss_conf.use_short_preamble = false;
 314         sdata->vif.bss_conf.use_short_slot = false;
 315         return BSS_CHANGED_ERP_CTS_PROT |
 316                BSS_CHANGED_ERP_PREAMBLE |
 317                BSS_CHANGED_ERP_SLOT;
 318 }
 319
 320 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 321                                  struct sk_buff *skb)
 322 {
 323         struct ieee80211_local *local = hw_to_local(hw);
 324         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 325         int tmp;
 326
 327         skb->dev = local->mdev;
 328         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 329         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 330                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 331         tmp = skb_queue_len(&local->skb_queue) +
 332                 skb_queue_len(&local->skb_queue_unreliable);
 333         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 334                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 335                 dev_kfree_skb_irq(skb);
 336                 tmp--;
 337                 I802_DEBUG_INC(local->tx_status_drop);
 338         }
 339         tasklet_schedule(&local->tasklet);
 340 }
 341 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 342
 343 static void ieee80211_tasklet_handler(unsigned long data)
 344 {
 345         struct ieee80211_local *local = (struct ieee80211_local *) data;
 346         struct sk_buff *skb;
 347         struct ieee80211_rx_status rx_status;
 348         struct ieee80211_ra_tid *ra_tid;
 349
 350         while ((skb = skb_dequeue(&local->skb_queue)) ||
 351                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 352                 switch (skb->pkt_type) {
 353                 case IEEE80211_RX_MSG:
 354                         /* status is in skb->cb */
 355                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 356                         /* Clear skb->pkt_type in order to not confuse kernel
 357                          * netstack. */
 358                         skb->pkt_type = 0;
 359                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 360                         break;
 361                 case IEEE80211_TX_STATUS_MSG:
 362                         skb->pkt_type = 0;
 363                         ieee80211_tx_status(local_to_hw(local), skb);
 364                         break;
 365                 case IEEE80211_DELBA_MSG:
 366                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 367                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 368                                                 ra_tid->ra, ra_tid->tid);
 369                         dev_kfree_skb(skb);
 370                         break;
 371                 case IEEE80211_ADDBA_MSG:
 372                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 373                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 374                                                  ra_tid->ra, ra_tid->tid);
 375                         dev_kfree_skb(skb);
 376                         break ;
 377                 default:
 378                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 379                              skb->pkt_type);
 380                         dev_kfree_skb(skb);
 381                         break;
 382                 }
 383         }
 384 }
 385
 386 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 387  * make a prepared TX frame (one that has been given to hw) to look like brand
 388  * new IEEE 802.11 frame that is ready to go through TX processing again.
 389  */
 390 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 391                                       struct ieee80211_key *key,
 392                                       struct sk_buff *skb)
 393 {
 394         unsigned int hdrlen, iv_len, mic_len;
 395         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 396
 397         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 398
 399         if (!key)
 400                 goto no_key;
 401
 402         switch (key->conf.alg) {
 403         case ALG_WEP:
 404                 iv_len = WEP_IV_LEN;
 405                 mic_len = WEP_ICV_LEN;
 406                 break;
 407         case ALG_TKIP:
 408                 iv_len = TKIP_IV_LEN;
 409                 mic_len = TKIP_ICV_LEN;
 410                 break;
 411         case ALG_CCMP:
 412                 iv_len = CCMP_HDR_LEN;
 413                 mic_len = CCMP_MIC_LEN;
 414                 break;
 415         default:
 416                 goto no_key;
 417         }
 418
 419         if (skb->len >= hdrlen + mic_len &&
 420             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 421                 skb_trim(skb, skb->len - mic_len);
 422         if (skb->len >= hdrlen + iv_len) {
 423                 memmove(skb->data + iv_len, skb->data, hdrlen);
 424                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 425         }
 426
 427 no_key:
 428         if (ieee80211_is_data_qos(hdr->frame_control)) {
 429                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 430                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 431                         hdrlen - IEEE80211_QOS_CTL_LEN);
 432                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 433         }
 434 }
 435
 436 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 437                                             struct sta_info *sta,
 438                                             struct sk_buff *skb)
 439 {
 440         sta->tx_filtered_count++;
 441
 442         /*
 443          * Clear the TX filter mask for this STA when sending the next
 444          * packet. If the STA went to power save mode, this will happen
 445          * when it wakes up for the next time.
 446          */
 447         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 448
 449         /*
 450          * This code races in the following way:
 451          *
 452          *  (1) STA sends frame indicating it will go to sleep and does so
 453          *  (2) hardware/firmware adds STA to filter list, passes frame up
 454          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 455          *  (4) we get TX status before having processed the frame and
 456          *      knowing that the STA has gone to sleep.
 457          *
 458          * This is actually quite unlikely even when both those events are
 459          * processed from interrupts coming in quickly after one another or
 460          * even at the same time because we queue both TX status events and
 461          * RX frames to be processed by a tasklet and process them in the
 462          * same order that they were received or TX status last. Hence, there
 463          * is no race as long as the frame RX is processed before the next TX
 464          * status, which drivers can ensure, see below.
 465          *
 466          * Note that this can only happen if the hardware or firmware can
 467          * actually add STAs to the filter list, if this is done by the
 468          * driver in response to set_tim() (which will only reduce the race
 469          * this whole filtering tries to solve, not completely solve it)
 470          * this situation cannot happen.
 471          *
 472          * To completely solve this race drivers need to make sure that they
 473          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 474          *      functions and
 475          *  (b) always process RX events before TX status events if ordering
 476          *      can be unknown, for example with different interrupt status
 477          *      bits.
 478          */
 479         if (test_sta_flags(sta, WLAN_STA_PS) &&
 480             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 481                 ieee80211_remove_tx_extra(local, sta->key, skb);
 482                 skb_queue_tail(&sta->tx_filtered, skb);
 483                 return;
 484         }
 485
 486         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 487                 /* Software retry the packet once */
 488                 skb->requeue = 1;
 489                 ieee80211_remove_tx_extra(local, sta->key, skb);
 490                 dev_queue_xmit(skb);
 491                 return;
 492         }
 493
 494 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 495         if (net_ratelimit())
 496                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 497                        "queue_len=%d PS=%d @%lu\n",
 498                        wiphy_name(local->hw.wiphy),
 499                        skb_queue_len(&sta->tx_filtered),
 500                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 501 #endif
 502         dev_kfree_skb(skb);
 503 }
 504
 505 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 506 {
 507         struct sk_buff *skb2;
 508         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 509         struct ieee80211_local *local = hw_to_local(hw);
 510         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 511         u16 frag, type;
 512         __le16 fc;
 513         struct ieee80211_supported_band *sband;
 514         struct ieee80211_tx_status_rtap_hdr *rthdr;
 515         struct ieee80211_sub_if_data *sdata;
 516         struct net_device *prev_dev = NULL;
 517         struct sta_info *sta;
 518         int retry_count = -1, i;
 519
 520         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 521                 /* the HW cannot have attempted that rate */
 522                 if (i >= hw->max_rates) {
 523                         info->status.rates[i].idx = -1;
 524                         info->status.rates[i].count = 0;
 525                 }
 526
 527                 retry_count += info->status.rates[i].count;
 528         }
 529         if (retry_count < 0)
 530                 retry_count = 0;
 531
 532         rcu_read_lock();
 533
 534         sband = local->hw.wiphy->bands[info->band];
 535
 536         sta = sta_info_get(local, hdr->addr1);
 537
 538         if (sta) {
 539                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 540                     test_sta_flags(sta, WLAN_STA_PS)) {
 541                         /*
 542                          * The STA is in power save mode, so assume
 543                          * that this TX packet failed because of that.
 544                          */
 545                         ieee80211_handle_filtered_frame(local, sta, skb);
 546                         rcu_read_unlock();
 547                         return;
 548                 }
 549
 550                 fc = hdr->frame_control;
 551
 552                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 553                     (ieee80211_is_data_qos(fc))) {
 554                         u16 tid, ssn;
 555                         u8 *qc;
 556
 557                         qc = ieee80211_get_qos_ctl(hdr);
 558                         tid = qc[0] & 0xf;
 559                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 560                                                 & IEEE80211_SCTL_SEQ);
 561                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 562                                            tid, ssn);
 563                 }
 564
 565                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 566                         ieee80211_handle_filtered_frame(local, sta, skb);
 567                         rcu_read_unlock();
 568                         return;
 569                 } else {
 570                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 571                                 sta->tx_retry_failed++;
 572                         sta->tx_retry_count += retry_count;
 573                 }
 574
 575                 rate_control_tx_status(local, sband, sta, skb);
 576         }
 577
 578         rcu_read_unlock();
 579
 580         ieee80211_led_tx(local, 0);
 581
 582         /* SNMP counters
 583          * Fragments are passed to low-level drivers as separate skbs, so these
 584          * are actually fragments, not frames. Update frame counters only for
 585          * the first fragment of the frame. */
 586
 587         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 588         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 589
 590         if (info->flags & IEEE80211_TX_STAT_ACK) {
 591                 if (frag == 0) {
 592                         local->dot11TransmittedFrameCount++;
 593                         if (is_multicast_ether_addr(hdr->addr1))
 594                                 local->dot11MulticastTransmittedFrameCount++;
 595                         if (retry_count > 0)
 596                                 local->dot11RetryCount++;
 597                         if (retry_count > 1)
 598                                 local->dot11MultipleRetryCount++;
 599                 }
 600
 601                 /* This counter shall be incremented for an acknowledged MPDU
 602                  * with an individual address in the address 1 field or an MPDU
 603                  * with a multicast address in the address 1 field of type Data
 604                  * or Management. */
 605                 if (!is_multicast_ether_addr(hdr->addr1) ||
 606                     type == IEEE80211_FTYPE_DATA ||
 607                     type == IEEE80211_FTYPE_MGMT)
 608                         local->dot11TransmittedFragmentCount++;
 609         } else {
 610                 if (frag == 0)
 611                         local->dot11FailedCount++;
 612         }
 613
 614         /* this was a transmitted frame, but now we want to reuse it */
 615         skb_orphan(skb);
 616
 617         /*
 618          * This is a bit racy but we can avoid a lot of work
 619          * with this test...
 620          */
 621         if (!local->monitors && !local->cooked_mntrs) {
 622                 dev_kfree_skb(skb);
 623                 return;
 624         }
 625
 626         /* send frame to monitor interfaces now */
 627
 628         if (skb_headroom(skb) < sizeof(*rthdr)) {
 629                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 630                 dev_kfree_skb(skb);
 631                 return;
 632         }
 633
 634         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 635                                 skb_push(skb, sizeof(*rthdr));
 636
 637         memset(rthdr, 0, sizeof(*rthdr));
 638         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 639         rthdr->hdr.it_present =
 640                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 641                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 642                             (1 << IEEE80211_RADIOTAP_RATE));
 643
 644         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 645             !is_multicast_ether_addr(hdr->addr1))
 646                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 647
 648         /*
 649          * XXX: Once radiotap gets the bitmap reset thing the vendor
 650          *      extensions proposal contains, we can actually report
 651          *      the whole set of tries we did.
 652          */
 653         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 654             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 655                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 656         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 657                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 658         if (info->status.rates[0].idx >= 0 &&
 659             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 660                 rthdr->rate = sband->bitrates[
 661                                 info->status.rates[0].idx].bitrate / 5;
 662
 663         /* for now report the total retry_count */
 664         rthdr->data_retries = retry_count;
 665
 666         /* XXX: is this sufficient for BPF? */
 667         skb_set_mac_header(skb, 0);
 668         skb->ip_summed = CHECKSUM_UNNECESSARY;
 669         skb->pkt_type = PACKET_OTHERHOST;
 670         skb->protocol = htons(ETH_P_802_2);
 671         memset(skb->cb, 0, sizeof(skb->cb));
 672
 673         rcu_read_lock();
 674         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 675                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 676                         if (!netif_running(sdata->dev))
 677                                 continue;
 678
 679                         if (prev_dev) {
 680                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 681                                 if (skb2) {
 682                                         skb2->dev = prev_dev;
 683                                         netif_rx(skb2);
 684                                 }
 685                         }
 686
 687                         prev_dev = sdata->dev;
 688                 }
 689         }
 690         if (prev_dev) {
 691                 skb->dev = prev_dev;
 692                 netif_rx(skb);
 693                 skb = NULL;
 694         }
 695         rcu_read_unlock();
 696         dev_kfree_skb(skb);
 697 }
 698 EXPORT_SYMBOL(ieee80211_tx_status);
 699
 700 static void ieee80211_restart_work(struct work_struct *work)
 701 {
 702         struct ieee80211_local *local =
 703                 container_of(work, struct ieee80211_local, restart_work);
 704
 705         rtnl_lock();
 706         ieee80211_reconfig(local);
 707         rtnl_unlock();
 708 }
 709
 710 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 711 {
 712         struct ieee80211_local *local = hw_to_local(hw);
 713
 714         /* use this reason, __ieee80211_resume will unblock it */
 715         ieee80211_stop_queues_by_reason(hw,
 716                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 717
 718         schedule_work(&local->restart_work);
 719 }
 720 EXPORT_SYMBOL(ieee80211_restart_hw);
 721
 722 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 723                                         const struct ieee80211_ops *ops)
 724 {
 725         struct ieee80211_local *local;
 726         int priv_size, i;
 727         struct wiphy *wiphy;
 728
 729         /* Ensure 32-byte alignment of our private data and hw private data.
 730          * We use the wiphy priv data for both our ieee80211_local and for
 731          * the driver's private data
 732          *
 733          * In memory it'll be like this:
 734          *
 735          * +-------------------------+
 736          * | struct wiphy           |
 737          * +-------------------------+
 738          * | struct ieee80211_local  |
 739          * +-------------------------+
 740          * | driver's private data   |
 741          * +-------------------------+
 742          *
 743          */
 744         priv_size = ((sizeof(struct ieee80211_local) +
 745                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 746                     priv_data_len;
 747
 748         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 749
 750         if (!wiphy)
 751                 return NULL;
 752
 753         wiphy->privid = mac80211_wiphy_privid;
 754
 755         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 756         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 757                                sizeof(struct cfg80211_bss);
 758
 759         local = wiphy_priv(wiphy);
 760
 761         local->hw.wiphy = wiphy;
 762
 763         local->hw.priv = (char *)local +
 764                          ((sizeof(struct ieee80211_local) +
 765                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 766
 767         BUG_ON(!ops->tx);
 768         BUG_ON(!ops->start);
 769         BUG_ON(!ops->stop);
 770         BUG_ON(!ops->config);
 771         BUG_ON(!ops->add_interface);
 772         BUG_ON(!ops->remove_interface);
 773         BUG_ON(!ops->configure_filter);
 774         local->ops = ops;
 775
 776         /* set up some defaults */
 777         local->hw.queues = 1;
 778         local->hw.max_rates = 1;
 779         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 780         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 781         local->hw.conf.radio_enabled = true;
 782         local->user_power_level = -1;
 783
 784         INIT_LIST_HEAD(&local->interfaces);
 785         mutex_init(&local->iflist_mtx);
 786
 787         spin_lock_init(&local->key_lock);
 788
 789         spin_lock_init(&local->queue_stop_reason_lock);
 790
 791         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 792
 793         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 794
 795         INIT_WORK(&local->dynamic_ps_enable_work,
 796                   ieee80211_dynamic_ps_enable_work);
 797         INIT_WORK(&local->dynamic_ps_disable_work,
 798                   ieee80211_dynamic_ps_disable_work);
 799         setup_timer(&local->dynamic_ps_timer,
 800                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 801
 802         sta_info_init(local);
 803
 804         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 805                 skb_queue_head_init(&local->pending[i]);
 806         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 807                      (unsigned long)local);
 808         tasklet_disable(&local->tx_pending_tasklet);
 809
 810         tasklet_init(&local->tasklet,
 811                      ieee80211_tasklet_handler,
 812                      (unsigned long) local);
 813         tasklet_disable(&local->tasklet);
 814
 815         skb_queue_head_init(&local->skb_queue);
 816         skb_queue_head_init(&local->skb_queue_unreliable);
 817
 818         spin_lock_init(&local->ampdu_lock);
 819
 820         return local_to_hw(local);
 821 }
 822 EXPORT_SYMBOL(ieee80211_alloc_hw);
 823
 824 static const struct net_device_ops ieee80211_master_ops = {
 825         .ndo_start_xmit = ieee80211_master_start_xmit,
 826         .ndo_open = ieee80211_master_open,
 827         .ndo_stop = ieee80211_master_stop,
 828         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 829         .ndo_select_queue = ieee80211_select_queue,
 830 };
 831
 832 static void ieee80211_master_setup(struct net_device *mdev)
 833 {
 834         mdev->type = ARPHRD_IEEE80211;
 835         mdev->netdev_ops = &ieee80211_master_ops;
 836         mdev->header_ops = &ieee80211_header_ops;
 837         mdev->tx_queue_len = 1000;
 838         mdev->addr_len = ETH_ALEN;
 839 }
 840
 841 int ieee80211_register_hw(struct ieee80211_hw *hw)
 842 {
 843         struct ieee80211_local *local = hw_to_local(hw);
 844         int result;
 845         enum ieee80211_band band;
 846         struct net_device *mdev;
 847         struct ieee80211_master_priv *mpriv;
 848         int channels, i, j, max_bitrates;
 849         bool supp_ht;
 850         static const u32 cipher_suites[] = {
 851                 WLAN_CIPHER_SUITE_WEP40,
 852                 WLAN_CIPHER_SUITE_WEP104,
 853                 WLAN_CIPHER_SUITE_TKIP,
 854                 WLAN_CIPHER_SUITE_CCMP,
 855
 856                 /* keep last -- depends on hw flags! */
 857                 WLAN_CIPHER_SUITE_AES_CMAC
 858         };
 859
 860         /*
 861          * generic code guarantees at least one band,
 862          * set this very early because much code assumes
 863          * that hw.conf.channel is assigned
 864          */
 865         channels = 0;
 866         max_bitrates = 0;
 867         supp_ht = false;
 868         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 869                 struct ieee80211_supported_band *sband;
 870
 871                 sband = local->hw.wiphy->bands[band];
 872                 if (!sband)
 873                         continue;
 874                 if (!local->oper_channel) {
 875                         /* init channel we're on */
 876                         local->hw.conf.channel =
 877                         local->oper_channel =
 878                         local->scan_channel = &sband->channels[0];
 879                 }
 880                 channels += sband->n_channels;
 881
 882                 if (max_bitrates < sband->n_bitrates)
 883                         max_bitrates = sband->n_bitrates;
 884                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 885         }
 886
 887         local->int_scan_req.n_channels = channels;
 888         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 889         if (!local->int_scan_req.channels)
 890                 return -ENOMEM;
 891
 892         /* if low-level driver supports AP, we also support VLAN */
 893         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 894                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 895
 896         /* mac80211 always supports monitor */
 897         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 898
 899         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 900                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 901         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 902                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 903
 904         /*
 905          * Calculate scan IE length -- we need this to alloc
 906          * memory and to subtract from the driver limit. It
 907          * includes the (extended) supported rates and HT
 908          * information -- SSID is the driver's responsibility.
 909          */
 910         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 911         if (supp_ht)
 912                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 913
 914         if (!local->ops->hw_scan) {
 915                 /* For hw_scan, driver needs to set these up. */
 916                 local->hw.wiphy->max_scan_ssids = 4;
 917                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 918         }
 919
 920         /*
 921          * If the driver supports any scan IEs, then assume the
 922          * limit includes the IEs mac80211 will add, otherwise
 923          * leave it at zero and let the driver sort it out; we
 924          * still pass our IEs to the driver but userspace will
 925          * not be allowed to in that case.
 926          */
 927         if (local->hw.wiphy->max_scan_ie_len)
 928                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 929
 930         local->hw.wiphy->cipher_suites = cipher_suites;
 931         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 932         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 933                 local->hw.wiphy->n_cipher_suites--;
 934
 935         result = wiphy_register(local->hw.wiphy);
 936         if (result < 0)
 937                 goto fail_wiphy_register;
 938
 939         /*
 940          * We use the number of queues for feature tests (QoS, HT) internally
 941          * so restrict them appropriately.
 942          */
 943         if (hw->queues > IEEE80211_MAX_QUEUES)
 944                 hw->queues = IEEE80211_MAX_QUEUES;
 945
 946         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 947                                "wmaster%d", ieee80211_master_setup,
 948                                hw->queues);
 949         if (!mdev)
 950                 goto fail_mdev_alloc;
 951
 952         mpriv = netdev_priv(mdev);
 953         mpriv->local = local;
 954         local->mdev = mdev;
 955
 956         local->hw.workqueue =
 957                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 958         if (!local->hw.workqueue) {
 959                 result = -ENOMEM;
 960                 goto fail_workqueue;
 961         }
 962
 963         /*
 964          * The hardware needs headroom for sending the frame,
 965          * and we need some headroom for passing the frame to monitor
 966          * interfaces, but never both at the same time.
 967          */
 968         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 969                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 970
 971         debugfs_hw_add(local);
 972
 973         if (local->hw.conf.beacon_int < 10)
 974                 local->hw.conf.beacon_int = 100;
 975
 976         if (local->hw.max_listen_interval == 0)
 977                 local->hw.max_listen_interval = 1;
 978
 979         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 980
 981         result = sta_info_start(local);
 982         if (result < 0)
 983                 goto fail_sta_info;
 984
 985         result = ieee80211_wep_init(local);
 986         if (result < 0) {
 987                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 988                        wiphy_name(local->hw.wiphy), result);
 989                 goto fail_wep;
 990         }
 991
 992         rtnl_lock();
 993         result = dev_alloc_name(local->mdev, local->mdev->name);
 994         if (result < 0)
 995                 goto fail_dev;
 996
 997         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 998         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 999         local->mdev->features |= NETIF_F_NETNS_LOCAL;
1000
1001         result = register_netdevice(local->mdev);
1002         if (result < 0)
1003                 goto fail_dev;
1004
1005         result = ieee80211_init_rate_ctrl_alg(local,
1006                                               hw->rate_control_algorithm);
1007         if (result < 0) {
1008                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1009                        "algorithm\n", wiphy_name(local->hw.wiphy));
1010                 goto fail_rate;
1011         }
1012
1013         /* add one default STA interface if supported */
1014         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1015                 result = ieee80211_if_add(local, "wlan%d", NULL,
1016                                           NL80211_IFTYPE_STATION, NULL);
1017                 if (result)
1018                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1019                                wiphy_name(local->hw.wiphy));
1020         }
1021
1022         rtnl_unlock();
1023
1024         ieee80211_led_init(local);
1025
1026         /* alloc internal scan request */
1027         i = 0;
1028         local->int_scan_req.ssids = &local->scan_ssid;
1029         local->int_scan_req.n_ssids = 1;
1030         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1031                 if (!hw->wiphy->bands[band])
1032                         continue;
1033                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1034                         local->int_scan_req.channels[i] =
1035                                 &hw->wiphy->bands[band]->channels[j];
1036                         i++;
1037                 }
1038         }
1039
1040         local->network_latency_notifier.notifier_call =
1041                 ieee80211_max_network_latency;
1042         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1043                                      &local->network_latency_notifier);
1044
1045         if (result) {
1046                 rtnl_lock();
1047                 goto fail_pm_qos;
1048         }
1049
1050         return 0;
1051
1052  fail_pm_qos:
1053         ieee80211_led_exit(local);
1054         ieee80211_remove_interfaces(local);
1055  fail_rate:
1056         unregister_netdevice(local->mdev);
1057         local->mdev = NULL;
1058  fail_dev:
1059         rtnl_unlock();
1060         ieee80211_wep_free(local);
1061  fail_wep:
1062         sta_info_stop(local);
1063  fail_sta_info:
1064         debugfs_hw_del(local);
1065         destroy_workqueue(local->hw.workqueue);
1066  fail_workqueue:
1067         if (local->mdev)
1068                 free_netdev(local->mdev);
1069  fail_mdev_alloc:
1070         wiphy_unregister(local->hw.wiphy);
1071  fail_wiphy_register:
1072         kfree(local->int_scan_req.channels);
1073         return result;
1074 }
1075 EXPORT_SYMBOL(ieee80211_register_hw);
1076
1077 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1078 {
1079         struct ieee80211_local *local = hw_to_local(hw);
1080
1081         tasklet_kill(&local->tx_pending_tasklet);
1082         tasklet_kill(&local->tasklet);
1083
1084         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1085                                &local->network_latency_notifier);
1086
1087         rtnl_lock();
1088
1089         /*
1090          * At this point, interface list manipulations are fine
1091          * because the driver cannot be handing us frames any
1092          * more and the tasklet is killed.
1093          */
1094
1095         /* First, we remove all virtual interfaces. */
1096         ieee80211_remove_interfaces(local);
1097
1098         /* then, finally, remove the master interface */
1099         unregister_netdevice(local->mdev);
1100
1101         rtnl_unlock();
1102
1103         ieee80211_clear_tx_pending(local);
1104         sta_info_stop(local);
1105         rate_control_deinitialize(local);
1106         debugfs_hw_del(local);
1107
1108         if (skb_queue_len(&local->skb_queue)
1109                         || skb_queue_len(&local->skb_queue_unreliable))
1110                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1111                        wiphy_name(local->hw.wiphy));
1112         skb_queue_purge(&local->skb_queue);
1113         skb_queue_purge(&local->skb_queue_unreliable);
1114
1115         destroy_workqueue(local->hw.workqueue);
1116         wiphy_unregister(local->hw.wiphy);
1117         ieee80211_wep_free(local);
1118         ieee80211_led_exit(local);
1119         free_netdev(local->mdev);
1120         kfree(local->int_scan_req.channels);
1121 }
1122 EXPORT_SYMBOL(ieee80211_unregister_hw);
1123
1124 void ieee80211_free_hw(struct ieee80211_hw *hw)
1125 {
1126         struct ieee80211_local *local = hw_to_local(hw);
1127
1128         mutex_destroy(&local->iflist_mtx);
1129
1130         wiphy_free(local->hw.wiphy);
1131 }
1132 EXPORT_SYMBOL(ieee80211_free_hw);
1133
1134 static int __init ieee80211_init(void)
1135 {
1136         struct sk_buff *skb;
1137         int ret;
1138
1139         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1140         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1141                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1142
1143         ret = rc80211_minstrel_init();
1144         if (ret)
1145                 return ret;
1146
1147         ret = rc80211_pid_init();
1148         if (ret)
1149                 return ret;
1150
1151         ieee80211_debugfs_netdev_init();
1152
1153         return 0;
1154 }
1155
1156 static void __exit ieee80211_exit(void)
1157 {
1158         rc80211_pid_exit();
1159         rc80211_minstrel_exit();
1160
1161         /*
1162          * For key todo, it'll be empty by now but the work
1163          * might still be scheduled.
1164          */
1165         flush_scheduled_work();
1166
1167         if (mesh_allocated)
1168                 ieee80211s_stop();
1169
1170         ieee80211_debugfs_netdev_exit();
1171 }
1172
1173
1174 subsys_initcall(ieee80211_init);
1175 module_exit(ieee80211_exit);
1176
1177 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1178 MODULE_LICENSE("GPL");