net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/pm_qos_params.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wme.h"
  33 #include "aes_ccm.h"
  34 #include "led.h"
  35 #include "cfg.h"
  36 #include "debugfs.h"
  37 #include "debugfs_netdev.h"
  38
  39 /*
  40  * For seeing transmitted packets on monitor interfaces
  41  * we have a radiotap header too.
  42  */
  43 struct ieee80211_tx_status_rtap_hdr {
  44         struct ieee80211_radiotap_header hdr;
  45         u8 rate;
  46         u8 padding_for_rate;
  47         __le16 tx_flags;
  48         u8 data_retries;
  49 } __attribute__ ((packed));
  50
  51
  52 /* must be called under mdev tx lock */
  53 void ieee80211_configure_filter(struct ieee80211_local *local)
  54 {
  55         unsigned int changed_flags;
  56         unsigned int new_flags = 0;
  57
  58         if (atomic_read(&local->iff_promiscs))
  59                 new_flags |= FIF_PROMISC_IN_BSS;
  60
  61         if (atomic_read(&local->iff_allmultis))
  62                 new_flags |= FIF_ALLMULTI;
  63
  64         if (local->monitors)
  65                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  66
  67         if (local->fif_fcsfail)
  68                 new_flags |= FIF_FCSFAIL;
  69
  70         if (local->fif_plcpfail)
  71                 new_flags |= FIF_PLCPFAIL;
  72
  73         if (local->fif_control)
  74                 new_flags |= FIF_CONTROL;
  75
  76         if (local->fif_other_bss)
  77                 new_flags |= FIF_OTHER_BSS;
  78
  79         changed_flags = local->filter_flags ^ new_flags;
  80
  81         /* be a bit nasty */
  82         new_flags |= (1<<31);
  83
  84         local->ops->configure_filter(local_to_hw(local),
  85                                      changed_flags, &new_flags,
  86                                      local->mdev->mc_count,
  87                                      local->mdev->mc_list);
  88
  89         WARN_ON(new_flags & (1<<31));
  90
  91         local->filter_flags = new_flags & ~(1<<31);
  92 }
  93
  94 /* master interface */
  95
  96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  97 {
  98         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  99         return ETH_ALEN;
 100 }
 101
 102 static const struct header_ops ieee80211_header_ops = {
 103         .create         = eth_header,
 104         .parse          = header_parse_80211,
 105         .rebuild        = eth_rebuild_header,
 106         .cache          = eth_header_cache,
 107         .cache_update   = eth_header_cache_update,
 108 };
 109
 110 static int ieee80211_master_open(struct net_device *dev)
 111 {
 112         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 113         struct ieee80211_local *local = mpriv->local;
 114         struct ieee80211_sub_if_data *sdata;
 115         int res = -EOPNOTSUPP;
 116
 117         /* we hold the RTNL here so can safely walk the list */
 118         list_for_each_entry(sdata, &local->interfaces, list) {
 119                 if (netif_running(sdata->dev)) {
 120                         res = 0;
 121                         break;
 122                 }
 123         }
 124
 125         if (res)
 126                 return res;
 127
 128         netif_tx_start_all_queues(local->mdev);
 129
 130         return 0;
 131 }
 132
 133 static int ieee80211_master_stop(struct net_device *dev)
 134 {
 135         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 136         struct ieee80211_local *local = mpriv->local;
 137         struct ieee80211_sub_if_data *sdata;
 138
 139         /* we hold the RTNL here so can safely walk the list */
 140         list_for_each_entry(sdata, &local->interfaces, list)
 141                 if (netif_running(sdata->dev))
 142                         dev_close(sdata->dev);
 143
 144         return 0;
 145 }
 146
 147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 148 {
 149         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 150         struct ieee80211_local *local = mpriv->local;
 151
 152         ieee80211_configure_filter(local);
 153 }
 154
 155 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 = local->ops->config(local_to_hw(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         if (local->ops->bss_info_changed)
 280                 local->ops->bss_info_changed(local_to_hw(local),
 281                                              &sdata->vif,
 282                                              &sdata->vif.bss_conf,
 283                                              changed);
 284
 285         /*
 286          * DEPRECATED
 287          *
 288          * ~changed is just there to not do this at resume time
 289          */
 290         if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
 291                 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
 292                 ieee80211_hw_config(local,
 293                                     _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
 294         }
 295 }
 296
 297 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 298 {
 299         sdata->vif.bss_conf.use_cts_prot = false;
 300         sdata->vif.bss_conf.use_short_preamble = false;
 301         sdata->vif.bss_conf.use_short_slot = false;
 302         return BSS_CHANGED_ERP_CTS_PROT |
 303                BSS_CHANGED_ERP_PREAMBLE |
 304                BSS_CHANGED_ERP_SLOT;
 305 }
 306
 307 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 308                                  struct sk_buff *skb)
 309 {
 310         struct ieee80211_local *local = hw_to_local(hw);
 311         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 312         int tmp;
 313
 314         skb->dev = local->mdev;
 315         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 316         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 317                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 318         tmp = skb_queue_len(&local->skb_queue) +
 319                 skb_queue_len(&local->skb_queue_unreliable);
 320         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 321                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 322                 dev_kfree_skb_irq(skb);
 323                 tmp--;
 324                 I802_DEBUG_INC(local->tx_status_drop);
 325         }
 326         tasklet_schedule(&local->tasklet);
 327 }
 328 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 329
 330 static void ieee80211_tasklet_handler(unsigned long data)
 331 {
 332         struct ieee80211_local *local = (struct ieee80211_local *) data;
 333         struct sk_buff *skb;
 334         struct ieee80211_rx_status rx_status;
 335         struct ieee80211_ra_tid *ra_tid;
 336
 337         while ((skb = skb_dequeue(&local->skb_queue)) ||
 338                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 339                 switch (skb->pkt_type) {
 340                 case IEEE80211_RX_MSG:
 341                         /* status is in skb->cb */
 342                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 343                         /* Clear skb->pkt_type in order to not confuse kernel
 344                          * netstack. */
 345                         skb->pkt_type = 0;
 346                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 347                         break;
 348                 case IEEE80211_TX_STATUS_MSG:
 349                         skb->pkt_type = 0;
 350                         ieee80211_tx_status(local_to_hw(local), skb);
 351                         break;
 352                 case IEEE80211_DELBA_MSG:
 353                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 354                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 355                                                 ra_tid->ra, ra_tid->tid);
 356                         dev_kfree_skb(skb);
 357                         break;
 358                 case IEEE80211_ADDBA_MSG:
 359                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 360                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 361                                                  ra_tid->ra, ra_tid->tid);
 362                         dev_kfree_skb(skb);
 363                         break ;
 364                 default:
 365                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 366                              skb->pkt_type);
 367                         dev_kfree_skb(skb);
 368                         break;
 369                 }
 370         }
 371 }
 372
 373 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 374  * make a prepared TX frame (one that has been given to hw) to look like brand
 375  * new IEEE 802.11 frame that is ready to go through TX processing again.
 376  */
 377 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 378                                       struct ieee80211_key *key,
 379                                       struct sk_buff *skb)
 380 {
 381         unsigned int hdrlen, iv_len, mic_len;
 382         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 383
 384         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 385
 386         if (!key)
 387                 goto no_key;
 388
 389         switch (key->conf.alg) {
 390         case ALG_WEP:
 391                 iv_len = WEP_IV_LEN;
 392                 mic_len = WEP_ICV_LEN;
 393                 break;
 394         case ALG_TKIP:
 395                 iv_len = TKIP_IV_LEN;
 396                 mic_len = TKIP_ICV_LEN;
 397                 break;
 398         case ALG_CCMP:
 399                 iv_len = CCMP_HDR_LEN;
 400                 mic_len = CCMP_MIC_LEN;
 401                 break;
 402         default:
 403                 goto no_key;
 404         }
 405
 406         if (skb->len >= hdrlen + mic_len &&
 407             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 408                 skb_trim(skb, skb->len - mic_len);
 409         if (skb->len >= hdrlen + iv_len) {
 410                 memmove(skb->data + iv_len, skb->data, hdrlen);
 411                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 412         }
 413
 414 no_key:
 415         if (ieee80211_is_data_qos(hdr->frame_control)) {
 416                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 417                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 418                         hdrlen - IEEE80211_QOS_CTL_LEN);
 419                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 420         }
 421 }
 422
 423 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 424                                             struct sta_info *sta,
 425                                             struct sk_buff *skb)
 426 {
 427         sta->tx_filtered_count++;
 428
 429         /*
 430          * Clear the TX filter mask for this STA when sending the next
 431          * packet. If the STA went to power save mode, this will happen
 432          * when it wakes up for the next time.
 433          */
 434         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 435
 436         /*
 437          * This code races in the following way:
 438          *
 439          *  (1) STA sends frame indicating it will go to sleep and does so
 440          *  (2) hardware/firmware adds STA to filter list, passes frame up
 441          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 442          *  (4) we get TX status before having processed the frame and
 443          *      knowing that the STA has gone to sleep.
 444          *
 445          * This is actually quite unlikely even when both those events are
 446          * processed from interrupts coming in quickly after one another or
 447          * even at the same time because we queue both TX status events and
 448          * RX frames to be processed by a tasklet and process them in the
 449          * same order that they were received or TX status last. Hence, there
 450          * is no race as long as the frame RX is processed before the next TX
 451          * status, which drivers can ensure, see below.
 452          *
 453          * Note that this can only happen if the hardware or firmware can
 454          * actually add STAs to the filter list, if this is done by the
 455          * driver in response to set_tim() (which will only reduce the race
 456          * this whole filtering tries to solve, not completely solve it)
 457          * this situation cannot happen.
 458          *
 459          * To completely solve this race drivers need to make sure that they
 460          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 461          *      functions and
 462          *  (b) always process RX events before TX status events if ordering
 463          *      can be unknown, for example with different interrupt status
 464          *      bits.
 465          */
 466         if (test_sta_flags(sta, WLAN_STA_PS) &&
 467             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 468                 ieee80211_remove_tx_extra(local, sta->key, skb);
 469                 skb_queue_tail(&sta->tx_filtered, skb);
 470                 return;
 471         }
 472
 473         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 474                 /* Software retry the packet once */
 475                 skb->requeue = 1;
 476                 ieee80211_remove_tx_extra(local, sta->key, skb);
 477                 dev_queue_xmit(skb);
 478                 return;
 479         }
 480
 481 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 482         if (net_ratelimit())
 483                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 484                        "queue_len=%d PS=%d @%lu\n",
 485                        wiphy_name(local->hw.wiphy),
 486                        skb_queue_len(&sta->tx_filtered),
 487                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 488 #endif
 489         dev_kfree_skb(skb);
 490 }
 491
 492 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 493 {
 494         struct sk_buff *skb2;
 495         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 496         struct ieee80211_local *local = hw_to_local(hw);
 497         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 498         u16 frag, type;
 499         __le16 fc;
 500         struct ieee80211_supported_band *sband;
 501         struct ieee80211_tx_status_rtap_hdr *rthdr;
 502         struct ieee80211_sub_if_data *sdata;
 503         struct net_device *prev_dev = NULL;
 504         struct sta_info *sta;
 505         int retry_count = -1, i;
 506
 507         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 508                 /* the HW cannot have attempted that rate */
 509                 if (i >= hw->max_rates) {
 510                         info->status.rates[i].idx = -1;
 511                         info->status.rates[i].count = 0;
 512                 }
 513
 514                 retry_count += info->status.rates[i].count;
 515         }
 516         if (retry_count < 0)
 517                 retry_count = 0;
 518
 519         rcu_read_lock();
 520
 521         sband = local->hw.wiphy->bands[info->band];
 522
 523         sta = sta_info_get(local, hdr->addr1);
 524
 525         if (sta) {
 526                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 527                     test_sta_flags(sta, WLAN_STA_PS)) {
 528                         /*
 529                          * The STA is in power save mode, so assume
 530                          * that this TX packet failed because of that.
 531                          */
 532                         ieee80211_handle_filtered_frame(local, sta, skb);
 533                         rcu_read_unlock();
 534                         return;
 535                 }
 536
 537                 fc = hdr->frame_control;
 538
 539                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 540                     (ieee80211_is_data_qos(fc))) {
 541                         u16 tid, ssn;
 542                         u8 *qc;
 543
 544                         qc = ieee80211_get_qos_ctl(hdr);
 545                         tid = qc[0] & 0xf;
 546                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 547                                                 & IEEE80211_SCTL_SEQ);
 548                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 549                                            tid, ssn);
 550                 }
 551
 552                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 553                         ieee80211_handle_filtered_frame(local, sta, skb);
 554                         rcu_read_unlock();
 555                         return;
 556                 } else {
 557                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 558                                 sta->tx_retry_failed++;
 559                         sta->tx_retry_count += retry_count;
 560                 }
 561
 562                 rate_control_tx_status(local, sband, sta, skb);
 563         }
 564
 565         rcu_read_unlock();
 566
 567         ieee80211_led_tx(local, 0);
 568
 569         /* SNMP counters
 570          * Fragments are passed to low-level drivers as separate skbs, so these
 571          * are actually fragments, not frames. Update frame counters only for
 572          * the first fragment of the frame. */
 573
 574         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 575         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 576
 577         if (info->flags & IEEE80211_TX_STAT_ACK) {
 578                 if (frag == 0) {
 579                         local->dot11TransmittedFrameCount++;
 580                         if (is_multicast_ether_addr(hdr->addr1))
 581                                 local->dot11MulticastTransmittedFrameCount++;
 582                         if (retry_count > 0)
 583                                 local->dot11RetryCount++;
 584                         if (retry_count > 1)
 585                                 local->dot11MultipleRetryCount++;
 586                 }
 587
 588                 /* This counter shall be incremented for an acknowledged MPDU
 589                  * with an individual address in the address 1 field or an MPDU
 590                  * with a multicast address in the address 1 field of type Data
 591                  * or Management. */
 592                 if (!is_multicast_ether_addr(hdr->addr1) ||
 593                     type == IEEE80211_FTYPE_DATA ||
 594                     type == IEEE80211_FTYPE_MGMT)
 595                         local->dot11TransmittedFragmentCount++;
 596         } else {
 597                 if (frag == 0)
 598                         local->dot11FailedCount++;
 599         }
 600
 601         /* this was a transmitted frame, but now we want to reuse it */
 602         skb_orphan(skb);
 603
 604         /*
 605          * This is a bit racy but we can avoid a lot of work
 606          * with this test...
 607          */
 608         if (!local->monitors && !local->cooked_mntrs) {
 609                 dev_kfree_skb(skb);
 610                 return;
 611         }
 612
 613         /* send frame to monitor interfaces now */
 614
 615         if (skb_headroom(skb) < sizeof(*rthdr)) {
 616                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 617                 dev_kfree_skb(skb);
 618                 return;
 619         }
 620
 621         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 622                                 skb_push(skb, sizeof(*rthdr));
 623
 624         memset(rthdr, 0, sizeof(*rthdr));
 625         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 626         rthdr->hdr.it_present =
 627                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 628                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 629                             (1 << IEEE80211_RADIOTAP_RATE));
 630
 631         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 632             !is_multicast_ether_addr(hdr->addr1))
 633                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 634
 635         /*
 636          * XXX: Once radiotap gets the bitmap reset thing the vendor
 637          *      extensions proposal contains, we can actually report
 638          *      the whole set of tries we did.
 639          */
 640         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 641             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 642                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 643         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 644                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 645         if (info->status.rates[0].idx >= 0 &&
 646             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 647                 rthdr->rate = sband->bitrates[
 648                                 info->status.rates[0].idx].bitrate / 5;
 649
 650         /* for now report the total retry_count */
 651         rthdr->data_retries = retry_count;
 652
 653         /* XXX: is this sufficient for BPF? */
 654         skb_set_mac_header(skb, 0);
 655         skb->ip_summed = CHECKSUM_UNNECESSARY;
 656         skb->pkt_type = PACKET_OTHERHOST;
 657         skb->protocol = htons(ETH_P_802_2);
 658         memset(skb->cb, 0, sizeof(skb->cb));
 659
 660         rcu_read_lock();
 661         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 662                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 663                         if (!netif_running(sdata->dev))
 664                                 continue;
 665
 666                         if (prev_dev) {
 667                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 668                                 if (skb2) {
 669                                         skb2->dev = prev_dev;
 670                                         netif_rx(skb2);
 671                                 }
 672                         }
 673
 674                         prev_dev = sdata->dev;
 675                 }
 676         }
 677         if (prev_dev) {
 678                 skb->dev = prev_dev;
 679                 netif_rx(skb);
 680                 skb = NULL;
 681         }
 682         rcu_read_unlock();
 683         dev_kfree_skb(skb);
 684 }
 685 EXPORT_SYMBOL(ieee80211_tx_status);
 686
 687 static void ieee80211_restart_work(struct work_struct *work)
 688 {
 689         struct ieee80211_local *local =
 690                 container_of(work, struct ieee80211_local, restart_work);
 691
 692         rtnl_lock();
 693         ieee80211_reconfig(local);
 694         rtnl_unlock();
 695 }
 696
 697 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 698 {
 699         struct ieee80211_local *local = hw_to_local(hw);
 700
 701         /* use this reason, __ieee80211_resume will unblock it */
 702         ieee80211_stop_queues_by_reason(hw,
 703                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 704
 705         schedule_work(&local->restart_work);
 706 }
 707 EXPORT_SYMBOL(ieee80211_restart_hw);
 708
 709 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 710                                         const struct ieee80211_ops *ops)
 711 {
 712         struct ieee80211_local *local;
 713         int priv_size, i;
 714         struct wiphy *wiphy;
 715
 716         /* Ensure 32-byte alignment of our private data and hw private data.
 717          * We use the wiphy priv data for both our ieee80211_local and for
 718          * the driver's private data
 719          *
 720          * In memory it'll be like this:
 721          *
 722          * +-------------------------+
 723          * | struct wiphy           |
 724          * +-------------------------+
 725          * | struct ieee80211_local  |
 726          * +-------------------------+
 727          * | driver's private data   |
 728          * +-------------------------+
 729          *
 730          */
 731         priv_size = ((sizeof(struct ieee80211_local) +
 732                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 733                     priv_data_len;
 734
 735         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 736
 737         if (!wiphy)
 738                 return NULL;
 739
 740         wiphy->privid = mac80211_wiphy_privid;
 741
 742         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 743         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 744                                sizeof(struct cfg80211_bss);
 745
 746         local = wiphy_priv(wiphy);
 747
 748         local->hw.wiphy = wiphy;
 749
 750         local->hw.priv = (char *)local +
 751                          ((sizeof(struct ieee80211_local) +
 752                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 753
 754         BUG_ON(!ops->tx);
 755         BUG_ON(!ops->start);
 756         BUG_ON(!ops->stop);
 757         BUG_ON(!ops->config);
 758         BUG_ON(!ops->add_interface);
 759         BUG_ON(!ops->remove_interface);
 760         BUG_ON(!ops->configure_filter);
 761         local->ops = ops;
 762
 763         /* set up some defaults */
 764         local->hw.queues = 1;
 765         local->hw.max_rates = 1;
 766         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 767         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 768         local->hw.conf.radio_enabled = true;
 769         local->user_power_level = -1;
 770
 771         INIT_LIST_HEAD(&local->interfaces);
 772         mutex_init(&local->iflist_mtx);
 773         mutex_init(&local->scan_mtx);
 774
 775         spin_lock_init(&local->key_lock);
 776
 777         spin_lock_init(&local->queue_stop_reason_lock);
 778
 779         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 780
 781         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 782
 783         INIT_WORK(&local->dynamic_ps_enable_work,
 784                   ieee80211_dynamic_ps_enable_work);
 785         INIT_WORK(&local->dynamic_ps_disable_work,
 786                   ieee80211_dynamic_ps_disable_work);
 787         setup_timer(&local->dynamic_ps_timer,
 788                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 789
 790         sta_info_init(local);
 791
 792         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 793                 skb_queue_head_init(&local->pending[i]);
 794         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 795                      (unsigned long)local);
 796         tasklet_disable(&local->tx_pending_tasklet);
 797
 798         tasklet_init(&local->tasklet,
 799                      ieee80211_tasklet_handler,
 800                      (unsigned long) local);
 801         tasklet_disable(&local->tasklet);
 802
 803         skb_queue_head_init(&local->skb_queue);
 804         skb_queue_head_init(&local->skb_queue_unreliable);
 805
 806         spin_lock_init(&local->ampdu_lock);
 807
 808         return local_to_hw(local);
 809 }
 810 EXPORT_SYMBOL(ieee80211_alloc_hw);
 811
 812 static const struct net_device_ops ieee80211_master_ops = {
 813         .ndo_start_xmit = ieee80211_master_start_xmit,
 814         .ndo_open = ieee80211_master_open,
 815         .ndo_stop = ieee80211_master_stop,
 816         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 817         .ndo_select_queue = ieee80211_select_queue,
 818 };
 819
 820 static void ieee80211_master_setup(struct net_device *mdev)
 821 {
 822         mdev->type = ARPHRD_IEEE80211;
 823         mdev->netdev_ops = &ieee80211_master_ops;
 824         mdev->header_ops = &ieee80211_header_ops;
 825         mdev->tx_queue_len = 1000;
 826         mdev->addr_len = ETH_ALEN;
 827 }
 828
 829 int ieee80211_register_hw(struct ieee80211_hw *hw)
 830 {
 831         struct ieee80211_local *local = hw_to_local(hw);
 832         int result;
 833         enum ieee80211_band band;
 834         struct net_device *mdev;
 835         struct ieee80211_master_priv *mpriv;
 836         int channels, i, j, max_bitrates;
 837         bool supp_ht;
 838         static const u32 cipher_suites[] = {
 839                 WLAN_CIPHER_SUITE_WEP40,
 840                 WLAN_CIPHER_SUITE_WEP104,
 841                 WLAN_CIPHER_SUITE_TKIP,
 842                 WLAN_CIPHER_SUITE_CCMP,
 843
 844                 /* keep last -- depends on hw flags! */
 845                 WLAN_CIPHER_SUITE_AES_CMAC
 846         };
 847
 848         /*
 849          * generic code guarantees at least one band,
 850          * set this very early because much code assumes
 851          * that hw.conf.channel is assigned
 852          */
 853         channels = 0;
 854         max_bitrates = 0;
 855         supp_ht = false;
 856         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 857                 struct ieee80211_supported_band *sband;
 858
 859                 sband = local->hw.wiphy->bands[band];
 860                 if (!sband)
 861                         continue;
 862                 if (!local->oper_channel) {
 863                         /* init channel we're on */
 864                         local->hw.conf.channel =
 865                         local->oper_channel =
 866                         local->scan_channel = &sband->channels[0];
 867                 }
 868                 channels += sband->n_channels;
 869
 870                 if (max_bitrates < sband->n_bitrates)
 871                         max_bitrates = sband->n_bitrates;
 872                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 873         }
 874
 875         local->int_scan_req.n_channels = channels;
 876         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 877         if (!local->int_scan_req.channels)
 878                 return -ENOMEM;
 879
 880         /* if low-level driver supports AP, we also support VLAN */
 881         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 882                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 883
 884         /* mac80211 always supports monitor */
 885         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 886
 887         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 888                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 889         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 890                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 891
 892         /*
 893          * Calculate scan IE length -- we need this to alloc
 894          * memory and to subtract from the driver limit. It
 895          * includes the (extended) supported rates and HT
 896          * information -- SSID is the driver's responsibility.
 897          */
 898         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 899         if (supp_ht)
 900                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 901
 902         if (!local->ops->hw_scan) {
 903                 /* For hw_scan, driver needs to set these up. */
 904                 local->hw.wiphy->max_scan_ssids = 4;
 905                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 906         }
 907
 908         /*
 909          * If the driver supports any scan IEs, then assume the
 910          * limit includes the IEs mac80211 will add, otherwise
 911          * leave it at zero and let the driver sort it out; we
 912          * still pass our IEs to the driver but userspace will
 913          * not be allowed to in that case.
 914          */
 915         if (local->hw.wiphy->max_scan_ie_len)
 916                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 917
 918         local->hw.wiphy->cipher_suites = cipher_suites;
 919         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 920         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 921                 local->hw.wiphy->n_cipher_suites--;
 922
 923         result = wiphy_register(local->hw.wiphy);
 924         if (result < 0)
 925                 goto fail_wiphy_register;
 926
 927         /*
 928          * We use the number of queues for feature tests (QoS, HT) internally
 929          * so restrict them appropriately.
 930          */
 931         if (hw->queues > IEEE80211_MAX_QUEUES)
 932                 hw->queues = IEEE80211_MAX_QUEUES;
 933
 934         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 935                                "wmaster%d", ieee80211_master_setup,
 936                                hw->queues);
 937         if (!mdev)
 938                 goto fail_mdev_alloc;
 939
 940         mpriv = netdev_priv(mdev);
 941         mpriv->local = local;
 942         local->mdev = mdev;
 943
 944         local->hw.workqueue =
 945                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 946         if (!local->hw.workqueue) {
 947                 result = -ENOMEM;
 948                 goto fail_workqueue;
 949         }
 950
 951         /*
 952          * The hardware needs headroom for sending the frame,
 953          * and we need some headroom for passing the frame to monitor
 954          * interfaces, but never both at the same time.
 955          */
 956         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 957                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 958
 959         debugfs_hw_add(local);
 960
 961         if (local->hw.max_listen_interval == 0)
 962                 local->hw.max_listen_interval = 1;
 963
 964         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 965
 966         result = sta_info_start(local);
 967         if (result < 0)
 968                 goto fail_sta_info;
 969
 970         result = ieee80211_wep_init(local);
 971         if (result < 0) {
 972                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 973                        wiphy_name(local->hw.wiphy), result);
 974                 goto fail_wep;
 975         }
 976
 977         rtnl_lock();
 978         result = dev_alloc_name(local->mdev, local->mdev->name);
 979         if (result < 0)
 980                 goto fail_dev;
 981
 982         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 983         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 984         local->mdev->features |= NETIF_F_NETNS_LOCAL;
 985
 986         result = register_netdevice(local->mdev);
 987         if (result < 0)
 988                 goto fail_dev;
 989
 990         result = ieee80211_init_rate_ctrl_alg(local,
 991                                               hw->rate_control_algorithm);
 992         if (result < 0) {
 993                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 994                        "algorithm\n", wiphy_name(local->hw.wiphy));
 995                 goto fail_rate;
 996         }
 997
 998         /* add one default STA interface if supported */
 999         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1000                 result = ieee80211_if_add(local, "wlan%d", NULL,
1001                                           NL80211_IFTYPE_STATION, NULL);
1002                 if (result)
1003                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1004                                wiphy_name(local->hw.wiphy));
1005         }
1006
1007         rtnl_unlock();
1008
1009         ieee80211_led_init(local);
1010
1011         /* alloc internal scan request */
1012         i = 0;
1013         local->int_scan_req.ssids = &local->scan_ssid;
1014         local->int_scan_req.n_ssids = 1;
1015         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1016                 if (!hw->wiphy->bands[band])
1017                         continue;
1018                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1019                         local->int_scan_req.channels[i] =
1020                                 &hw->wiphy->bands[band]->channels[j];
1021                         i++;
1022                 }
1023         }
1024
1025         local->network_latency_notifier.notifier_call =
1026                 ieee80211_max_network_latency;
1027         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1028                                      &local->network_latency_notifier);
1029
1030         if (result) {
1031                 rtnl_lock();
1032                 goto fail_pm_qos;
1033         }
1034
1035         return 0;
1036
1037  fail_pm_qos:
1038         ieee80211_led_exit(local);
1039         ieee80211_remove_interfaces(local);
1040  fail_rate:
1041         unregister_netdevice(local->mdev);
1042         local->mdev = NULL;
1043  fail_dev:
1044         rtnl_unlock();
1045         ieee80211_wep_free(local);
1046  fail_wep:
1047         sta_info_stop(local);
1048  fail_sta_info:
1049         debugfs_hw_del(local);
1050         destroy_workqueue(local->hw.workqueue);
1051  fail_workqueue:
1052         if (local->mdev)
1053                 free_netdev(local->mdev);
1054  fail_mdev_alloc:
1055         wiphy_unregister(local->hw.wiphy);
1056  fail_wiphy_register:
1057         kfree(local->int_scan_req.channels);
1058         return result;
1059 }
1060 EXPORT_SYMBOL(ieee80211_register_hw);
1061
1062 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1063 {
1064         struct ieee80211_local *local = hw_to_local(hw);
1065
1066         tasklet_kill(&local->tx_pending_tasklet);
1067         tasklet_kill(&local->tasklet);
1068
1069         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1070                                &local->network_latency_notifier);
1071
1072         rtnl_lock();
1073
1074         /*
1075          * At this point, interface list manipulations are fine
1076          * because the driver cannot be handing us frames any
1077          * more and the tasklet is killed.
1078          */
1079
1080         /* First, we remove all virtual interfaces. */
1081         ieee80211_remove_interfaces(local);
1082
1083         /* then, finally, remove the master interface */
1084         unregister_netdevice(local->mdev);
1085
1086         rtnl_unlock();
1087
1088         ieee80211_clear_tx_pending(local);
1089         sta_info_stop(local);
1090         rate_control_deinitialize(local);
1091         debugfs_hw_del(local);
1092
1093         if (skb_queue_len(&local->skb_queue)
1094                         || skb_queue_len(&local->skb_queue_unreliable))
1095                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1096                        wiphy_name(local->hw.wiphy));
1097         skb_queue_purge(&local->skb_queue);
1098         skb_queue_purge(&local->skb_queue_unreliable);
1099
1100         destroy_workqueue(local->hw.workqueue);
1101         wiphy_unregister(local->hw.wiphy);
1102         ieee80211_wep_free(local);
1103         ieee80211_led_exit(local);
1104         free_netdev(local->mdev);
1105         kfree(local->int_scan_req.channels);
1106 }
1107 EXPORT_SYMBOL(ieee80211_unregister_hw);
1108
1109 void ieee80211_free_hw(struct ieee80211_hw *hw)
1110 {
1111         struct ieee80211_local *local = hw_to_local(hw);
1112
1113         mutex_destroy(&local->iflist_mtx);
1114         mutex_destroy(&local->scan_mtx);
1115
1116         wiphy_free(local->hw.wiphy);
1117 }
1118 EXPORT_SYMBOL(ieee80211_free_hw);
1119
1120 static int __init ieee80211_init(void)
1121 {
1122         struct sk_buff *skb;
1123         int ret;
1124
1125         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1126         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1127                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1128
1129         ret = rc80211_minstrel_init();
1130         if (ret)
1131                 return ret;
1132
1133         ret = rc80211_pid_init();
1134         if (ret)
1135                 return ret;
1136
1137         ieee80211_debugfs_netdev_init();
1138
1139         return 0;
1140 }
1141
1142 static void __exit ieee80211_exit(void)
1143 {
1144         rc80211_pid_exit();
1145         rc80211_minstrel_exit();
1146
1147         /*
1148          * For key todo, it'll be empty by now but the work
1149          * might still be scheduled.
1150          */
1151         flush_scheduled_work();
1152
1153         if (mesh_allocated)
1154                 ieee80211s_stop();
1155
1156         ieee80211_debugfs_netdev_exit();
1157 }
1158
1159
1160 subsys_initcall(ieee80211_init);
1161 module_exit(ieee80211_exit);
1162
1163 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1164 MODULE_LICENSE("GPL");