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 "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wme.h"
  34 #include "aes_ccm.h"
  35 #include "led.h"
  36 #include "cfg.h"
  37 #include "debugfs.h"
  38 #include "debugfs_netdev.h"
  39
  40 /*
  41  * For seeing transmitted packets on monitor interfaces
  42  * we have a radiotap header too.
  43  */
  44 struct ieee80211_tx_status_rtap_hdr {
  45         struct ieee80211_radiotap_header hdr;
  46         u8 rate;
  47         u8 padding_for_rate;
  48         __le16 tx_flags;
  49         u8 data_retries;
  50 } __attribute__ ((packed));
  51
  52
  53 /* must be called under mdev tx lock */
  54 void ieee80211_configure_filter(struct ieee80211_local *local)
  55 {
  56         unsigned int changed_flags;
  57         unsigned int new_flags = 0;
  58
  59         if (atomic_read(&local->iff_promiscs))
  60                 new_flags |= FIF_PROMISC_IN_BSS;
  61
  62         if (atomic_read(&local->iff_allmultis))
  63                 new_flags |= FIF_ALLMULTI;
  64
  65         if (local->monitors)
  66                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  67
  68         if (local->fif_fcsfail)
  69                 new_flags |= FIF_FCSFAIL;
  70
  71         if (local->fif_plcpfail)
  72                 new_flags |= FIF_PLCPFAIL;
  73
  74         if (local->fif_control)
  75                 new_flags |= FIF_CONTROL;
  76
  77         if (local->fif_other_bss)
  78                 new_flags |= FIF_OTHER_BSS;
  79
  80         changed_flags = local->filter_flags ^ new_flags;
  81
  82         /* be a bit nasty */
  83         new_flags |= (1<<31);
  84
  85         drv_configure_filter(local, 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 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 156 {
 157         struct ieee80211_channel *chan, *scan_chan;
 158         int ret = 0;
 159         int power;
 160         enum nl80211_channel_type channel_type;
 161
 162         might_sleep();
 163
 164         scan_chan = local->scan_channel;
 165
 166         if (scan_chan) {
 167                 chan = scan_chan;
 168                 channel_type = NL80211_CHAN_NO_HT;
 169         } else {
 170                 chan = local->oper_channel;
 171                 channel_type = local->oper_channel_type;
 172         }
 173
 174         if (chan != local->hw.conf.channel ||
 175             channel_type != local->hw.conf.channel_type) {
 176                 local->hw.conf.channel = chan;
 177                 local->hw.conf.channel_type = channel_type;
 178                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 179         }
 180
 181         if (scan_chan)
 182                 power = chan->max_power;
 183         else
 184                 power = local->power_constr_level ?
 185                         (chan->max_power - local->power_constr_level) :
 186                         chan->max_power;
 187
 188         if (local->user_power_level >= 0)
 189                 power = min(power, local->user_power_level);
 190
 191         if (local->hw.conf.power_level != power) {
 192                 changed |= IEEE80211_CONF_CHANGE_POWER;
 193                 local->hw.conf.power_level = power;
 194         }
 195
 196         if (changed && local->open_count) {
 197                 ret = drv_config(local, changed);
 198                 /*
 199                  * Goal:
 200                  * HW reconfiguration should never fail, the driver has told
 201                  * us what it can support so it should live up to that promise.
 202                  *
 203                  * Current status:
 204                  * rfkill is not integrated with mac80211 and a
 205                  * configuration command can thus fail if hardware rfkill
 206                  * is enabled
 207                  *
 208                  * FIXME: integrate rfkill with mac80211 and then add this
 209                  * WARN_ON() back
 210                  *
 211                  */
 212                 /* WARN_ON(ret); */
 213         }
 214
 215         return ret;
 216 }
 217
 218 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 219                                       u32 changed)
 220 {
 221         struct ieee80211_local *local = sdata->local;
 222
 223         if (!changed)
 224                 return;
 225
 226         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 227                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 228         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 229                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 230         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 231                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
 232         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 233                 static const u8 zero[ETH_ALEN] = { 0 };
 234                 sdata->vif.bss_conf.bssid = zero;
 235         } else {
 236                 WARN_ON(1);
 237                 return;
 238         }
 239
 240         switch (sdata->vif.type) {
 241         case NL80211_IFTYPE_AP:
 242         case NL80211_IFTYPE_ADHOC:
 243         case NL80211_IFTYPE_MESH_POINT:
 244                 break;
 245         default:
 246                 /* do not warn to simplify caller in scan.c */
 247                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 248                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 249                         return;
 250                 break;
 251         }
 252
 253         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 254                 if (local->sw_scanning) {
 255                         sdata->vif.bss_conf.enable_beacon = false;
 256                 } else {
 257                         /*
 258                          * Beacon should be enabled, but AP mode must
 259                          * check whether there is a beacon configured.
 260                          */
 261                         switch (sdata->vif.type) {
 262                         case NL80211_IFTYPE_AP:
 263                                 sdata->vif.bss_conf.enable_beacon =
 264                                         !!rcu_dereference(sdata->u.ap.beacon);
 265                                 break;
 266                         case NL80211_IFTYPE_ADHOC:
 267                                 sdata->vif.bss_conf.enable_beacon =
 268                                         !!rcu_dereference(sdata->u.ibss.presp);
 269                                 break;
 270                         case NL80211_IFTYPE_MESH_POINT:
 271                                 sdata->vif.bss_conf.enable_beacon = true;
 272                                 break;
 273                         default:
 274                                 /* not reached */
 275                                 WARN_ON(1);
 276                                 break;
 277                         }
 278                 }
 279         }
 280
 281         drv_bss_info_changed(local, &sdata->vif,
 282                              &sdata->vif.bss_conf, changed);
 283
 284         /*
 285          * DEPRECATED
 286          *
 287          * ~changed is just there to not do this at resume time
 288          */
 289         if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
 290                 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
 291                 ieee80211_hw_config(local,
 292                                     _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
 293         }
 294 }
 295
 296 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 297 {
 298         sdata->vif.bss_conf.use_cts_prot = false;
 299         sdata->vif.bss_conf.use_short_preamble = false;
 300         sdata->vif.bss_conf.use_short_slot = false;
 301         return BSS_CHANGED_ERP_CTS_PROT |
 302                BSS_CHANGED_ERP_PREAMBLE |
 303                BSS_CHANGED_ERP_SLOT;
 304 }
 305
 306 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 307                                  struct sk_buff *skb)
 308 {
 309         struct ieee80211_local *local = hw_to_local(hw);
 310         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 311         int tmp;
 312
 313         skb->dev = local->mdev;
 314         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 315         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 316                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 317         tmp = skb_queue_len(&local->skb_queue) +
 318                 skb_queue_len(&local->skb_queue_unreliable);
 319         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 320                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 321                 dev_kfree_skb_irq(skb);
 322                 tmp--;
 323                 I802_DEBUG_INC(local->tx_status_drop);
 324         }
 325         tasklet_schedule(&local->tasklet);
 326 }
 327 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 328
 329 static void ieee80211_tasklet_handler(unsigned long data)
 330 {
 331         struct ieee80211_local *local = (struct ieee80211_local *) data;
 332         struct sk_buff *skb;
 333         struct ieee80211_rx_status rx_status;
 334         struct ieee80211_ra_tid *ra_tid;
 335
 336         while ((skb = skb_dequeue(&local->skb_queue)) ||
 337                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 338                 switch (skb->pkt_type) {
 339                 case IEEE80211_RX_MSG:
 340                         /* status is in skb->cb */
 341                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 342                         /* Clear skb->pkt_type in order to not confuse kernel
 343                          * netstack. */
 344                         skb->pkt_type = 0;
 345                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 346                         break;
 347                 case IEEE80211_TX_STATUS_MSG:
 348                         skb->pkt_type = 0;
 349                         ieee80211_tx_status(local_to_hw(local), skb);
 350                         break;
 351                 case IEEE80211_DELBA_MSG:
 352                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 353                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 354                                                 ra_tid->ra, ra_tid->tid);
 355                         dev_kfree_skb(skb);
 356                         break;
 357                 case IEEE80211_ADDBA_MSG:
 358                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 359                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 360                                                  ra_tid->ra, ra_tid->tid);
 361                         dev_kfree_skb(skb);
 362                         break ;
 363                 default:
 364                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 365                              skb->pkt_type);
 366                         dev_kfree_skb(skb);
 367                         break;
 368                 }
 369         }
 370 }
 371
 372 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 373  * make a prepared TX frame (one that has been given to hw) to look like brand
 374  * new IEEE 802.11 frame that is ready to go through TX processing again.
 375  */
 376 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 377                                       struct ieee80211_key *key,
 378                                       struct sk_buff *skb)
 379 {
 380         unsigned int hdrlen, iv_len, mic_len;
 381         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 382
 383         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 384
 385         if (!key)
 386                 goto no_key;
 387
 388         switch (key->conf.alg) {
 389         case ALG_WEP:
 390                 iv_len = WEP_IV_LEN;
 391                 mic_len = WEP_ICV_LEN;
 392                 break;
 393         case ALG_TKIP:
 394                 iv_len = TKIP_IV_LEN;
 395                 mic_len = TKIP_ICV_LEN;
 396                 break;
 397         case ALG_CCMP:
 398                 iv_len = CCMP_HDR_LEN;
 399                 mic_len = CCMP_MIC_LEN;
 400                 break;
 401         default:
 402                 goto no_key;
 403         }
 404
 405         if (skb->len >= hdrlen + mic_len &&
 406             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 407                 skb_trim(skb, skb->len - mic_len);
 408         if (skb->len >= hdrlen + iv_len) {
 409                 memmove(skb->data + iv_len, skb->data, hdrlen);
 410                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 411         }
 412
 413 no_key:
 414         if (ieee80211_is_data_qos(hdr->frame_control)) {
 415                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 416                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 417                         hdrlen - IEEE80211_QOS_CTL_LEN);
 418                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 419         }
 420 }
 421
 422 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 423                                             struct sta_info *sta,
 424                                             struct sk_buff *skb)
 425 {
 426         sta->tx_filtered_count++;
 427
 428         /*
 429          * Clear the TX filter mask for this STA when sending the next
 430          * packet. If the STA went to power save mode, this will happen
 431          * when it wakes up for the next time.
 432          */
 433         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 434
 435         /*
 436          * This code races in the following way:
 437          *
 438          *  (1) STA sends frame indicating it will go to sleep and does so
 439          *  (2) hardware/firmware adds STA to filter list, passes frame up
 440          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 441          *  (4) we get TX status before having processed the frame and
 442          *      knowing that the STA has gone to sleep.
 443          *
 444          * This is actually quite unlikely even when both those events are
 445          * processed from interrupts coming in quickly after one another or
 446          * even at the same time because we queue both TX status events and
 447          * RX frames to be processed by a tasklet and process them in the
 448          * same order that they were received or TX status last. Hence, there
 449          * is no race as long as the frame RX is processed before the next TX
 450          * status, which drivers can ensure, see below.
 451          *
 452          * Note that this can only happen if the hardware or firmware can
 453          * actually add STAs to the filter list, if this is done by the
 454          * driver in response to set_tim() (which will only reduce the race
 455          * this whole filtering tries to solve, not completely solve it)
 456          * this situation cannot happen.
 457          *
 458          * To completely solve this race drivers need to make sure that they
 459          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 460          *      functions and
 461          *  (b) always process RX events before TX status events if ordering
 462          *      can be unknown, for example with different interrupt status
 463          *      bits.
 464          */
 465         if (test_sta_flags(sta, WLAN_STA_PS) &&
 466             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 467                 ieee80211_remove_tx_extra(local, sta->key, skb);
 468                 skb_queue_tail(&sta->tx_filtered, skb);
 469                 return;
 470         }
 471
 472         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 473                 /* Software retry the packet once */
 474                 skb->requeue = 1;
 475                 ieee80211_remove_tx_extra(local, sta->key, skb);
 476                 dev_queue_xmit(skb);
 477                 return;
 478         }
 479
 480 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 481         if (net_ratelimit())
 482                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 483                        "queue_len=%d PS=%d @%lu\n",
 484                        wiphy_name(local->hw.wiphy),
 485                        skb_queue_len(&sta->tx_filtered),
 486                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 487 #endif
 488         dev_kfree_skb(skb);
 489 }
 490
 491 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 492 {
 493         struct sk_buff *skb2;
 494         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 495         struct ieee80211_local *local = hw_to_local(hw);
 496         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 497         u16 frag, type;
 498         __le16 fc;
 499         struct ieee80211_supported_band *sband;
 500         struct ieee80211_tx_status_rtap_hdr *rthdr;
 501         struct ieee80211_sub_if_data *sdata;
 502         struct net_device *prev_dev = NULL;
 503         struct sta_info *sta;
 504         int retry_count = -1, i;
 505
 506         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 507                 /* the HW cannot have attempted that rate */
 508                 if (i >= hw->max_rates) {
 509                         info->status.rates[i].idx = -1;
 510                         info->status.rates[i].count = 0;
 511                 }
 512
 513                 retry_count += info->status.rates[i].count;
 514         }
 515         if (retry_count < 0)
 516                 retry_count = 0;
 517
 518         rcu_read_lock();
 519
 520         sband = local->hw.wiphy->bands[info->band];
 521
 522         sta = sta_info_get(local, hdr->addr1);
 523
 524         if (sta) {
 525                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 526                     test_sta_flags(sta, WLAN_STA_PS)) {
 527                         /*
 528                          * The STA is in power save mode, so assume
 529                          * that this TX packet failed because of that.
 530                          */
 531                         ieee80211_handle_filtered_frame(local, sta, skb);
 532                         rcu_read_unlock();
 533                         return;
 534                 }
 535
 536                 fc = hdr->frame_control;
 537
 538                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 539                     (ieee80211_is_data_qos(fc))) {
 540                         u16 tid, ssn;
 541                         u8 *qc;
 542
 543                         qc = ieee80211_get_qos_ctl(hdr);
 544                         tid = qc[0] & 0xf;
 545                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 546                                                 & IEEE80211_SCTL_SEQ);
 547                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 548                                            tid, ssn);
 549                 }
 550
 551                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 552                         ieee80211_handle_filtered_frame(local, sta, skb);
 553                         rcu_read_unlock();
 554                         return;
 555                 } else {
 556                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 557                                 sta->tx_retry_failed++;
 558                         sta->tx_retry_count += retry_count;
 559                 }
 560
 561                 rate_control_tx_status(local, sband, sta, skb);
 562         }
 563
 564         rcu_read_unlock();
 565
 566         ieee80211_led_tx(local, 0);
 567
 568         /* SNMP counters
 569          * Fragments are passed to low-level drivers as separate skbs, so these
 570          * are actually fragments, not frames. Update frame counters only for
 571          * the first fragment of the frame. */
 572
 573         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 574         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 575
 576         if (info->flags & IEEE80211_TX_STAT_ACK) {
 577                 if (frag == 0) {
 578                         local->dot11TransmittedFrameCount++;
 579                         if (is_multicast_ether_addr(hdr->addr1))
 580                                 local->dot11MulticastTransmittedFrameCount++;
 581                         if (retry_count > 0)
 582                                 local->dot11RetryCount++;
 583                         if (retry_count > 1)
 584                                 local->dot11MultipleRetryCount++;
 585                 }
 586
 587                 /* This counter shall be incremented for an acknowledged MPDU
 588                  * with an individual address in the address 1 field or an MPDU
 589                  * with a multicast address in the address 1 field of type Data
 590                  * or Management. */
 591                 if (!is_multicast_ether_addr(hdr->addr1) ||
 592                     type == IEEE80211_FTYPE_DATA ||
 593                     type == IEEE80211_FTYPE_MGMT)
 594                         local->dot11TransmittedFragmentCount++;
 595         } else {
 596                 if (frag == 0)
 597                         local->dot11FailedCount++;
 598         }
 599
 600         /* this was a transmitted frame, but now we want to reuse it */
 601         skb_orphan(skb);
 602
 603         /*
 604          * This is a bit racy but we can avoid a lot of work
 605          * with this test...
 606          */
 607         if (!local->monitors && !local->cooked_mntrs) {
 608                 dev_kfree_skb(skb);
 609                 return;
 610         }
 611
 612         /* send frame to monitor interfaces now */
 613
 614         if (skb_headroom(skb) < sizeof(*rthdr)) {
 615                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 616                 dev_kfree_skb(skb);
 617                 return;
 618         }
 619
 620         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 621                                 skb_push(skb, sizeof(*rthdr));
 622
 623         memset(rthdr, 0, sizeof(*rthdr));
 624         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 625         rthdr->hdr.it_present =
 626                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 627                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 628                             (1 << IEEE80211_RADIOTAP_RATE));
 629
 630         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 631             !is_multicast_ether_addr(hdr->addr1))
 632                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 633
 634         /*
 635          * XXX: Once radiotap gets the bitmap reset thing the vendor
 636          *      extensions proposal contains, we can actually report
 637          *      the whole set of tries we did.
 638          */
 639         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 640             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 641                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 642         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 643                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 644         if (info->status.rates[0].idx >= 0 &&
 645             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 646                 rthdr->rate = sband->bitrates[
 647                                 info->status.rates[0].idx].bitrate / 5;
 648
 649         /* for now report the total retry_count */
 650         rthdr->data_retries = retry_count;
 651
 652         /* XXX: is this sufficient for BPF? */
 653         skb_set_mac_header(skb, 0);
 654         skb->ip_summed = CHECKSUM_UNNECESSARY;
 655         skb->pkt_type = PACKET_OTHERHOST;
 656         skb->protocol = htons(ETH_P_802_2);
 657         memset(skb->cb, 0, sizeof(skb->cb));
 658
 659         rcu_read_lock();
 660         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 661                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 662                         if (!netif_running(sdata->dev))
 663                                 continue;
 664
 665                         if (prev_dev) {
 666                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 667                                 if (skb2) {
 668                                         skb2->dev = prev_dev;
 669                                         netif_rx(skb2);
 670                                 }
 671                         }
 672
 673                         prev_dev = sdata->dev;
 674                 }
 675         }
 676         if (prev_dev) {
 677                 skb->dev = prev_dev;
 678                 netif_rx(skb);
 679                 skb = NULL;
 680         }
 681         rcu_read_unlock();
 682         dev_kfree_skb(skb);
 683 }
 684 EXPORT_SYMBOL(ieee80211_tx_status);
 685
 686 static void ieee80211_restart_work(struct work_struct *work)
 687 {
 688         struct ieee80211_local *local =
 689                 container_of(work, struct ieee80211_local, restart_work);
 690
 691         rtnl_lock();
 692         ieee80211_reconfig(local);
 693         rtnl_unlock();
 694 }
 695
 696 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 697 {
 698         struct ieee80211_local *local = hw_to_local(hw);
 699
 700         /* use this reason, __ieee80211_resume will unblock it */
 701         ieee80211_stop_queues_by_reason(hw,
 702                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 703
 704         schedule_work(&local->restart_work);
 705 }
 706 EXPORT_SYMBOL(ieee80211_restart_hw);
 707
 708 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 709                                         const struct ieee80211_ops *ops)
 710 {
 711         struct ieee80211_local *local;
 712         int priv_size, i;
 713         struct wiphy *wiphy;
 714
 715         /* Ensure 32-byte alignment of our private data and hw private data.
 716          * We use the wiphy priv data for both our ieee80211_local and for
 717          * the driver's private data
 718          *
 719          * In memory it'll be like this:
 720          *
 721          * +-------------------------+
 722          * | struct wiphy           |
 723          * +-------------------------+
 724          * | struct ieee80211_local  |
 725          * +-------------------------+
 726          * | driver's private data   |
 727          * +-------------------------+
 728          *
 729          */
 730         priv_size = ((sizeof(struct ieee80211_local) +
 731                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 732                     priv_data_len;
 733
 734         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 735
 736         if (!wiphy)
 737                 return NULL;
 738
 739         wiphy->privid = mac80211_wiphy_privid;
 740
 741         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 742         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 743                                sizeof(struct cfg80211_bss);
 744
 745         local = wiphy_priv(wiphy);
 746
 747         local->hw.wiphy = wiphy;
 748
 749         local->hw.priv = (char *)local +
 750                          ((sizeof(struct ieee80211_local) +
 751                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 752
 753         BUG_ON(!ops->tx);
 754         BUG_ON(!ops->start);
 755         BUG_ON(!ops->stop);
 756         BUG_ON(!ops->config);
 757         BUG_ON(!ops->add_interface);
 758         BUG_ON(!ops->remove_interface);
 759         BUG_ON(!ops->configure_filter);
 760         local->ops = ops;
 761
 762         /* set up some defaults */
 763         local->hw.queues = 1;
 764         local->hw.max_rates = 1;
 765         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 766         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 767         local->hw.conf.radio_enabled = true;
 768         local->user_power_level = -1;
 769
 770         INIT_LIST_HEAD(&local->interfaces);
 771         mutex_init(&local->iflist_mtx);
 772         mutex_init(&local->scan_mtx);
 773
 774         spin_lock_init(&local->key_lock);
 775
 776         spin_lock_init(&local->queue_stop_reason_lock);
 777
 778         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 779
 780         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 781
 782         INIT_WORK(&local->dynamic_ps_enable_work,
 783                   ieee80211_dynamic_ps_enable_work);
 784         INIT_WORK(&local->dynamic_ps_disable_work,
 785                   ieee80211_dynamic_ps_disable_work);
 786         setup_timer(&local->dynamic_ps_timer,
 787                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 788
 789         sta_info_init(local);
 790
 791         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 792                 skb_queue_head_init(&local->pending[i]);
 793         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 794                      (unsigned long)local);
 795         tasklet_disable(&local->tx_pending_tasklet);
 796
 797         tasklet_init(&local->tasklet,
 798                      ieee80211_tasklet_handler,
 799                      (unsigned long) local);
 800         tasklet_disable(&local->tasklet);
 801
 802         skb_queue_head_init(&local->skb_queue);
 803         skb_queue_head_init(&local->skb_queue_unreliable);
 804
 805         spin_lock_init(&local->ampdu_lock);
 806
 807         return local_to_hw(local);
 808 }
 809 EXPORT_SYMBOL(ieee80211_alloc_hw);
 810
 811 static const struct net_device_ops ieee80211_master_ops = {
 812         .ndo_start_xmit = ieee80211_master_start_xmit,
 813         .ndo_open = ieee80211_master_open,
 814         .ndo_stop = ieee80211_master_stop,
 815         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 816         .ndo_select_queue = ieee80211_select_queue,
 817 };
 818
 819 static void ieee80211_master_setup(struct net_device *mdev)
 820 {
 821         mdev->type = ARPHRD_IEEE80211;
 822         mdev->netdev_ops = &ieee80211_master_ops;
 823         mdev->header_ops = &ieee80211_header_ops;
 824         mdev->tx_queue_len = 1000;
 825         mdev->addr_len = ETH_ALEN;
 826 }
 827
 828 int ieee80211_register_hw(struct ieee80211_hw *hw)
 829 {
 830         struct ieee80211_local *local = hw_to_local(hw);
 831         int result;
 832         enum ieee80211_band band;
 833         struct net_device *mdev;
 834         struct ieee80211_master_priv *mpriv;
 835         int channels, i, j, max_bitrates;
 836         bool supp_ht;
 837         static const u32 cipher_suites[] = {
 838                 WLAN_CIPHER_SUITE_WEP40,
 839                 WLAN_CIPHER_SUITE_WEP104,
 840                 WLAN_CIPHER_SUITE_TKIP,
 841                 WLAN_CIPHER_SUITE_CCMP,
 842
 843                 /* keep last -- depends on hw flags! */
 844                 WLAN_CIPHER_SUITE_AES_CMAC
 845         };
 846
 847         /*
 848          * generic code guarantees at least one band,
 849          * set this very early because much code assumes
 850          * that hw.conf.channel is assigned
 851          */
 852         channels = 0;
 853         max_bitrates = 0;
 854         supp_ht = false;
 855         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 856                 struct ieee80211_supported_band *sband;
 857
 858                 sband = local->hw.wiphy->bands[band];
 859                 if (!sband)
 860                         continue;
 861                 if (!local->oper_channel) {
 862                         /* init channel we're on */
 863                         local->hw.conf.channel =
 864                         local->oper_channel = &sband->channels[0];
 865                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 866                 }
 867                 channels += sband->n_channels;
 868
 869                 if (max_bitrates < sband->n_bitrates)
 870                         max_bitrates = sband->n_bitrates;
 871                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 872         }
 873
 874         local->int_scan_req.n_channels = channels;
 875         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 876         if (!local->int_scan_req.channels)
 877                 return -ENOMEM;
 878
 879         /* if low-level driver supports AP, we also support VLAN */
 880         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 881                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 882
 883         /* mac80211 always supports monitor */
 884         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 885
 886         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 887                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 888         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 889                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 890
 891         /*
 892          * Calculate scan IE length -- we need this to alloc
 893          * memory and to subtract from the driver limit. It
 894          * includes the (extended) supported rates and HT
 895          * information -- SSID is the driver's responsibility.
 896          */
 897         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 898         if (supp_ht)
 899                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 900
 901         if (!local->ops->hw_scan) {
 902                 /* For hw_scan, driver needs to set these up. */
 903                 local->hw.wiphy->max_scan_ssids = 4;
 904                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 905         }
 906
 907         /*
 908          * If the driver supports any scan IEs, then assume the
 909          * limit includes the IEs mac80211 will add, otherwise
 910          * leave it at zero and let the driver sort it out; we
 911          * still pass our IEs to the driver but userspace will
 912          * not be allowed to in that case.
 913          */
 914         if (local->hw.wiphy->max_scan_ie_len)
 915                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 916
 917         local->hw.wiphy->cipher_suites = cipher_suites;
 918         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 919         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 920                 local->hw.wiphy->n_cipher_suites--;
 921
 922         result = wiphy_register(local->hw.wiphy);
 923         if (result < 0)
 924                 goto fail_wiphy_register;
 925
 926         /*
 927          * We use the number of queues for feature tests (QoS, HT) internally
 928          * so restrict them appropriately.
 929          */
 930         if (hw->queues > IEEE80211_MAX_QUEUES)
 931                 hw->queues = IEEE80211_MAX_QUEUES;
 932
 933         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 934                                "wmaster%d", ieee80211_master_setup,
 935                                hw->queues);
 936         if (!mdev)
 937                 goto fail_mdev_alloc;
 938
 939         mpriv = netdev_priv(mdev);
 940         mpriv->local = local;
 941         local->mdev = mdev;
 942
 943         local->hw.workqueue =
 944                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 945         if (!local->hw.workqueue) {
 946                 result = -ENOMEM;
 947                 goto fail_workqueue;
 948         }
 949
 950         /*
 951          * The hardware needs headroom for sending the frame,
 952          * and we need some headroom for passing the frame to monitor
 953          * interfaces, but never both at the same time.
 954          */
 955         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 956                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 957
 958         debugfs_hw_add(local);
 959
 960         if (local->hw.max_listen_interval == 0)
 961                 local->hw.max_listen_interval = 1;
 962
 963         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 964
 965         result = sta_info_start(local);
 966         if (result < 0)
 967                 goto fail_sta_info;
 968
 969         result = ieee80211_wep_init(local);
 970         if (result < 0) {
 971                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 972                        wiphy_name(local->hw.wiphy), result);
 973                 goto fail_wep;
 974         }
 975
 976         rtnl_lock();
 977         result = dev_alloc_name(local->mdev, local->mdev->name);
 978         if (result < 0)
 979                 goto fail_dev;
 980
 981         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 982         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 983         local->mdev->features |= NETIF_F_NETNS_LOCAL;
 984
 985         result = register_netdevice(local->mdev);
 986         if (result < 0)
 987                 goto fail_dev;
 988
 989         result = ieee80211_init_rate_ctrl_alg(local,
 990                                               hw->rate_control_algorithm);
 991         if (result < 0) {
 992                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 993                        "algorithm\n", wiphy_name(local->hw.wiphy));
 994                 goto fail_rate;
 995         }
 996
 997         /* add one default STA interface if supported */
 998         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 999                 result = ieee80211_if_add(local, "wlan%d", NULL,
1000                                           NL80211_IFTYPE_STATION, NULL);
1001                 if (result)
1002                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1003                                wiphy_name(local->hw.wiphy));
1004         }
1005
1006         rtnl_unlock();
1007
1008         ieee80211_led_init(local);
1009
1010         /* alloc internal scan request */
1011         i = 0;
1012         local->int_scan_req.ssids = &local->scan_ssid;
1013         local->int_scan_req.n_ssids = 1;
1014         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1015                 if (!hw->wiphy->bands[band])
1016                         continue;
1017                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1018                         local->int_scan_req.channels[i] =
1019                                 &hw->wiphy->bands[band]->channels[j];
1020                         i++;
1021                 }
1022         }
1023
1024         local->network_latency_notifier.notifier_call =
1025                 ieee80211_max_network_latency;
1026         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1027                                      &local->network_latency_notifier);
1028
1029         if (result) {
1030                 rtnl_lock();
1031                 goto fail_pm_qos;
1032         }
1033
1034         return 0;
1035
1036  fail_pm_qos:
1037         ieee80211_led_exit(local);
1038         ieee80211_remove_interfaces(local);
1039  fail_rate:
1040         unregister_netdevice(local->mdev);
1041         local->mdev = NULL;
1042  fail_dev:
1043         rtnl_unlock();
1044         ieee80211_wep_free(local);
1045  fail_wep:
1046         sta_info_stop(local);
1047  fail_sta_info:
1048         debugfs_hw_del(local);
1049         destroy_workqueue(local->hw.workqueue);
1050  fail_workqueue:
1051         if (local->mdev)
1052                 free_netdev(local->mdev);
1053  fail_mdev_alloc:
1054         wiphy_unregister(local->hw.wiphy);
1055  fail_wiphy_register:
1056         kfree(local->int_scan_req.channels);
1057         return result;
1058 }
1059 EXPORT_SYMBOL(ieee80211_register_hw);
1060
1061 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1062 {
1063         struct ieee80211_local *local = hw_to_local(hw);
1064
1065         tasklet_kill(&local->tx_pending_tasklet);
1066         tasklet_kill(&local->tasklet);
1067
1068         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1069                                &local->network_latency_notifier);
1070
1071         rtnl_lock();
1072
1073         /*
1074          * At this point, interface list manipulations are fine
1075          * because the driver cannot be handing us frames any
1076          * more and the tasklet is killed.
1077          */
1078
1079         /* First, we remove all virtual interfaces. */
1080         ieee80211_remove_interfaces(local);
1081
1082         /* then, finally, remove the master interface */
1083         unregister_netdevice(local->mdev);
1084
1085         rtnl_unlock();
1086
1087         ieee80211_clear_tx_pending(local);
1088         sta_info_stop(local);
1089         rate_control_deinitialize(local);
1090         debugfs_hw_del(local);
1091
1092         if (skb_queue_len(&local->skb_queue)
1093                         || skb_queue_len(&local->skb_queue_unreliable))
1094                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1095                        wiphy_name(local->hw.wiphy));
1096         skb_queue_purge(&local->skb_queue);
1097         skb_queue_purge(&local->skb_queue_unreliable);
1098
1099         destroy_workqueue(local->hw.workqueue);
1100         wiphy_unregister(local->hw.wiphy);
1101         ieee80211_wep_free(local);
1102         ieee80211_led_exit(local);
1103         free_netdev(local->mdev);
1104         kfree(local->int_scan_req.channels);
1105 }
1106 EXPORT_SYMBOL(ieee80211_unregister_hw);
1107
1108 void ieee80211_free_hw(struct ieee80211_hw *hw)
1109 {
1110         struct ieee80211_local *local = hw_to_local(hw);
1111
1112         mutex_destroy(&local->iflist_mtx);
1113         mutex_destroy(&local->scan_mtx);
1114
1115         wiphy_free(local->hw.wiphy);
1116 }
1117 EXPORT_SYMBOL(ieee80211_free_hw);
1118
1119 static int __init ieee80211_init(void)
1120 {
1121         struct sk_buff *skb;
1122         int ret;
1123
1124         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1125         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1126                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1127
1128         ret = rc80211_minstrel_init();
1129         if (ret)
1130                 return ret;
1131
1132         ret = rc80211_pid_init();
1133         if (ret)
1134                 return ret;
1135
1136         ieee80211_debugfs_netdev_init();
1137
1138         return 0;
1139 }
1140
1141 static void __exit ieee80211_exit(void)
1142 {
1143         rc80211_pid_exit();
1144         rc80211_minstrel_exit();
1145
1146         /*
1147          * For key todo, it'll be empty by now but the work
1148          * might still be scheduled.
1149          */
1150         flush_scheduled_work();
1151
1152         if (mesh_allocated)
1153                 ieee80211s_stop();
1154
1155         ieee80211_debugfs_netdev_exit();
1156 }
1157
1158
1159 subsys_initcall(ieee80211_init);
1160 module_exit(ieee80211_exit);
1161
1162 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1163 MODULE_LICENSE("GPL");