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