net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/pm_qos_params.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "wme.h"
  34 #include "aes_ccm.h"
  35 #include "led.h"
  36 #include "cfg.h"
  37 #include "debugfs.h"
  38 #include "debugfs_netdev.h"
  39
  40 /*
  41  * For seeing transmitted packets on monitor interfaces
  42  * we have a radiotap header too.
  43  */
  44 struct ieee80211_tx_status_rtap_hdr {
  45         struct ieee80211_radiotap_header hdr;
  46         u8 rate;
  47         u8 padding_for_rate;
  48         __le16 tx_flags;
  49         u8 data_retries;
  50 } __attribute__ ((packed));
  51
  52
  53 /* must be called under mdev tx lock */
  54 void ieee80211_configure_filter(struct ieee80211_local *local)
  55 {
  56         unsigned int changed_flags;
  57         unsigned int new_flags = 0;
  58
  59         if (atomic_read(&local->iff_promiscs))
  60                 new_flags |= FIF_PROMISC_IN_BSS;
  61
  62         if (atomic_read(&local->iff_allmultis))
  63                 new_flags |= FIF_ALLMULTI;
  64
  65         if (local->monitors)
  66                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  67
  68         if (local->fif_fcsfail)
  69                 new_flags |= FIF_FCSFAIL;
  70
  71         if (local->fif_plcpfail)
  72                 new_flags |= FIF_PLCPFAIL;
  73
  74         if (local->fif_control)
  75                 new_flags |= FIF_CONTROL;
  76
  77         if (local->fif_other_bss)
  78                 new_flags |= FIF_OTHER_BSS;
  79
  80         changed_flags = local->filter_flags ^ new_flags;
  81
  82         /* be a bit nasty */
  83         new_flags |= (1<<31);
  84
  85         drv_configure_filter(local, changed_flags, &new_flags,
  86                              local->mdev->mc_count,
  87                              local->mdev->mc_list);
  88
  89         WARN_ON(new_flags & (1<<31));
  90
  91         local->filter_flags = new_flags & ~(1<<31);
  92 }
  93
  94 /* master interface */
  95
  96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  97 {
  98         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  99         return ETH_ALEN;
 100 }
 101
 102 static const struct header_ops ieee80211_header_ops = {
 103         .create         = eth_header,
 104         .parse          = header_parse_80211,
 105         .rebuild        = eth_rebuild_header,
 106         .cache          = eth_header_cache,
 107         .cache_update   = eth_header_cache_update,
 108 };
 109
 110 static int ieee80211_master_open(struct net_device *dev)
 111 {
 112         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 113         struct ieee80211_local *local = mpriv->local;
 114         struct ieee80211_sub_if_data *sdata;
 115         int res = -EOPNOTSUPP;
 116
 117         /* we hold the RTNL here so can safely walk the list */
 118         list_for_each_entry(sdata, &local->interfaces, list) {
 119                 if (netif_running(sdata->dev)) {
 120                         res = 0;
 121                         break;
 122                 }
 123         }
 124
 125         if (res)
 126                 return res;
 127
 128         netif_tx_start_all_queues(local->mdev);
 129
 130         return 0;
 131 }
 132
 133 static int ieee80211_master_stop(struct net_device *dev)
 134 {
 135         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 136         struct ieee80211_local *local = mpriv->local;
 137         struct ieee80211_sub_if_data *sdata;
 138
 139         /* we hold the RTNL here so can safely walk the list */
 140         list_for_each_entry(sdata, &local->interfaces, list)
 141                 if (netif_running(sdata->dev))
 142                         dev_close(sdata->dev);
 143
 144         return 0;
 145 }
 146
 147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 148 {
 149         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 150         struct ieee80211_local *local = mpriv->local;
 151
 152         ieee80211_configure_filter(local);
 153 }
 154
 155 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 156 {
 157         struct ieee80211_channel *chan, *scan_chan;
 158         int ret = 0;
 159         int power;
 160         enum nl80211_channel_type channel_type;
 161
 162         might_sleep();
 163
 164         scan_chan = local->scan_channel;
 165
 166         if (scan_chan) {
 167                 chan = scan_chan;
 168                 channel_type = NL80211_CHAN_NO_HT;
 169         } else {
 170                 chan = local->oper_channel;
 171                 channel_type = local->oper_channel_type;
 172         }
 173
 174         if (chan != local->hw.conf.channel ||
 175             channel_type != local->hw.conf.channel_type) {
 176                 local->hw.conf.channel = chan;
 177                 local->hw.conf.channel_type = channel_type;
 178                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 179         }
 180
 181         if (scan_chan)
 182                 power = chan->max_power;
 183         else
 184                 power = local->power_constr_level ?
 185                         (chan->max_power - local->power_constr_level) :
 186                         chan->max_power;
 187
 188         if (local->user_power_level >= 0)
 189                 power = min(power, local->user_power_level);
 190
 191         if (local->hw.conf.power_level != power) {
 192                 changed |= IEEE80211_CONF_CHANGE_POWER;
 193                 local->hw.conf.power_level = power;
 194         }
 195
 196         if (changed && local->open_count) {
 197                 ret = drv_config(local, changed);
 198                 /*
 199                  * Goal:
 200                  * HW reconfiguration should never fail, the driver has told
 201                  * us what it can support so it should live up to that promise.
 202                  *
 203                  * Current status:
 204                  * rfkill is not integrated with mac80211 and a
 205                  * configuration command can thus fail if hardware rfkill
 206                  * is enabled
 207                  *
 208                  * FIXME: integrate rfkill with mac80211 and then add this
 209                  * WARN_ON() back
 210                  *
 211                  */
 212                 /* WARN_ON(ret); */
 213         }
 214
 215         return ret;
 216 }
 217
 218 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 219                                       u32 changed)
 220 {
 221         struct ieee80211_local *local = sdata->local;
 222         static const u8 zero[ETH_ALEN] = { 0 };
 223
 224         if (!changed)
 225                 return;
 226
 227         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 228                 /*
 229                  * While not associated, claim a BSSID of all-zeroes
 230                  * so that drivers don't do any weird things with the
 231                  * BSSID at that time.
 232                  */
 233                 if (sdata->vif.bss_conf.assoc)
 234                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 235                 else
 236                         sdata->vif.bss_conf.bssid = zero;
 237         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 238                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 239         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 240                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
 241         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 242                 sdata->vif.bss_conf.bssid = zero;
 243         } else {
 244                 WARN_ON(1);
 245                 return;
 246         }
 247
 248         switch (sdata->vif.type) {
 249         case NL80211_IFTYPE_AP:
 250         case NL80211_IFTYPE_ADHOC:
 251         case NL80211_IFTYPE_MESH_POINT:
 252                 break;
 253         default:
 254                 /* do not warn to simplify caller in scan.c */
 255                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 256                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 257                         return;
 258                 break;
 259         }
 260
 261         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 262                 if (local->sw_scanning) {
 263                         sdata->vif.bss_conf.enable_beacon = false;
 264                 } else {
 265                         /*
 266                          * Beacon should be enabled, but AP mode must
 267                          * check whether there is a beacon configured.
 268                          */
 269                         switch (sdata->vif.type) {
 270                         case NL80211_IFTYPE_AP:
 271                                 sdata->vif.bss_conf.enable_beacon =
 272                                         !!rcu_dereference(sdata->u.ap.beacon);
 273                                 break;
 274                         case NL80211_IFTYPE_ADHOC:
 275                                 sdata->vif.bss_conf.enable_beacon =
 276                                         !!rcu_dereference(sdata->u.ibss.presp);
 277                                 break;
 278                         case NL80211_IFTYPE_MESH_POINT:
 279                                 sdata->vif.bss_conf.enable_beacon = true;
 280                                 break;
 281                         default:
 282                                 /* not reached */
 283                                 WARN_ON(1);
 284                                 break;
 285                         }
 286                 }
 287         }
 288
 289         drv_bss_info_changed(local, &sdata->vif,
 290                              &sdata->vif.bss_conf, changed);
 291
 292         /*
 293          * DEPRECATED
 294          *
 295          * ~changed is just there to not do this at resume time
 296          */
 297         if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
 298                 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
 299                 ieee80211_hw_config(local,
 300                                     _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
 301         }
 302 }
 303
 304 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 305 {
 306         sdata->vif.bss_conf.use_cts_prot = false;
 307         sdata->vif.bss_conf.use_short_preamble = false;
 308         sdata->vif.bss_conf.use_short_slot = false;
 309         return BSS_CHANGED_ERP_CTS_PROT |
 310                BSS_CHANGED_ERP_PREAMBLE |
 311                BSS_CHANGED_ERP_SLOT;
 312 }
 313
 314 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 315                                  struct sk_buff *skb)
 316 {
 317         struct ieee80211_local *local = hw_to_local(hw);
 318         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 319         int tmp;
 320
 321         skb->dev = local->mdev;
 322         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 323         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 324                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 325         tmp = skb_queue_len(&local->skb_queue) +
 326                 skb_queue_len(&local->skb_queue_unreliable);
 327         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 328                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 329                 dev_kfree_skb_irq(skb);
 330                 tmp--;
 331                 I802_DEBUG_INC(local->tx_status_drop);
 332         }
 333         tasklet_schedule(&local->tasklet);
 334 }
 335 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 336
 337 static void ieee80211_tasklet_handler(unsigned long data)
 338 {
 339         struct ieee80211_local *local = (struct ieee80211_local *) data;
 340         struct sk_buff *skb;
 341         struct ieee80211_rx_status rx_status;
 342         struct ieee80211_ra_tid *ra_tid;
 343
 344         while ((skb = skb_dequeue(&local->skb_queue)) ||
 345                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 346                 switch (skb->pkt_type) {
 347                 case IEEE80211_RX_MSG:
 348                         /* status is in skb->cb */
 349                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 350                         /* Clear skb->pkt_type in order to not confuse kernel
 351                          * netstack. */
 352                         skb->pkt_type = 0;
 353                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 354                         break;
 355                 case IEEE80211_TX_STATUS_MSG:
 356                         skb->pkt_type = 0;
 357                         ieee80211_tx_status(local_to_hw(local), skb);
 358                         break;
 359                 case IEEE80211_DELBA_MSG:
 360                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 361                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 362                                                 ra_tid->ra, ra_tid->tid);
 363                         dev_kfree_skb(skb);
 364                         break;
 365                 case IEEE80211_ADDBA_MSG:
 366                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 367                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 368                                                  ra_tid->ra, ra_tid->tid);
 369                         dev_kfree_skb(skb);
 370                         break ;
 371                 default:
 372                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 373                              skb->pkt_type);
 374                         dev_kfree_skb(skb);
 375                         break;
 376                 }
 377         }
 378 }
 379
 380 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 381  * make a prepared TX frame (one that has been given to hw) to look like brand
 382  * new IEEE 802.11 frame that is ready to go through TX processing again.
 383  */
 384 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 385                                       struct ieee80211_key *key,
 386                                       struct sk_buff *skb)
 387 {
 388         unsigned int hdrlen, iv_len, mic_len;
 389         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 390
 391         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 392
 393         if (!key)
 394                 goto no_key;
 395
 396         switch (key->conf.alg) {
 397         case ALG_WEP:
 398                 iv_len = WEP_IV_LEN;
 399                 mic_len = WEP_ICV_LEN;
 400                 break;
 401         case ALG_TKIP:
 402                 iv_len = TKIP_IV_LEN;
 403                 mic_len = TKIP_ICV_LEN;
 404                 break;
 405         case ALG_CCMP:
 406                 iv_len = CCMP_HDR_LEN;
 407                 mic_len = CCMP_MIC_LEN;
 408                 break;
 409         default:
 410                 goto no_key;
 411         }
 412
 413         if (skb->len >= hdrlen + mic_len &&
 414             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 415                 skb_trim(skb, skb->len - mic_len);
 416         if (skb->len >= hdrlen + iv_len) {
 417                 memmove(skb->data + iv_len, skb->data, hdrlen);
 418                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 419         }
 420
 421 no_key:
 422         if (ieee80211_is_data_qos(hdr->frame_control)) {
 423                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 424                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 425                         hdrlen - IEEE80211_QOS_CTL_LEN);
 426                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 427         }
 428 }
 429
 430 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 431                                             struct sta_info *sta,
 432                                             struct sk_buff *skb)
 433 {
 434         sta->tx_filtered_count++;
 435
 436         /*
 437          * Clear the TX filter mask for this STA when sending the next
 438          * packet. If the STA went to power save mode, this will happen
 439          * when it wakes up for the next time.
 440          */
 441         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 442
 443         /*
 444          * This code races in the following way:
 445          *
 446          *  (1) STA sends frame indicating it will go to sleep and does so
 447          *  (2) hardware/firmware adds STA to filter list, passes frame up
 448          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 449          *  (4) we get TX status before having processed the frame and
 450          *      knowing that the STA has gone to sleep.
 451          *
 452          * This is actually quite unlikely even when both those events are
 453          * processed from interrupts coming in quickly after one another or
 454          * even at the same time because we queue both TX status events and
 455          * RX frames to be processed by a tasklet and process them in the
 456          * same order that they were received or TX status last. Hence, there
 457          * is no race as long as the frame RX is processed before the next TX
 458          * status, which drivers can ensure, see below.
 459          *
 460          * Note that this can only happen if the hardware or firmware can
 461          * actually add STAs to the filter list, if this is done by the
 462          * driver in response to set_tim() (which will only reduce the race
 463          * this whole filtering tries to solve, not completely solve it)
 464          * this situation cannot happen.
 465          *
 466          * To completely solve this race drivers need to make sure that they
 467          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 468          *      functions and
 469          *  (b) always process RX events before TX status events if ordering
 470          *      can be unknown, for example with different interrupt status
 471          *      bits.
 472          */
 473         if (test_sta_flags(sta, WLAN_STA_PS) &&
 474             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 475                 ieee80211_remove_tx_extra(local, sta->key, skb);
 476                 skb_queue_tail(&sta->tx_filtered, skb);
 477                 return;
 478         }
 479
 480         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 481                 /* Software retry the packet once */
 482                 skb->requeue = 1;
 483                 ieee80211_remove_tx_extra(local, sta->key, skb);
 484                 dev_queue_xmit(skb);
 485                 return;
 486         }
 487
 488 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 489         if (net_ratelimit())
 490                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 491                        "queue_len=%d PS=%d @%lu\n",
 492                        wiphy_name(local->hw.wiphy),
 493                        skb_queue_len(&sta->tx_filtered),
 494                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 495 #endif
 496         dev_kfree_skb(skb);
 497 }
 498
 499 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 500 {
 501         struct sk_buff *skb2;
 502         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 503         struct ieee80211_local *local = hw_to_local(hw);
 504         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 505         u16 frag, type;
 506         __le16 fc;
 507         struct ieee80211_supported_band *sband;
 508         struct ieee80211_tx_status_rtap_hdr *rthdr;
 509         struct ieee80211_sub_if_data *sdata;
 510         struct net_device *prev_dev = NULL;
 511         struct sta_info *sta;
 512         int retry_count = -1, i;
 513
 514         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 515                 /* the HW cannot have attempted that rate */
 516                 if (i >= hw->max_rates) {
 517                         info->status.rates[i].idx = -1;
 518                         info->status.rates[i].count = 0;
 519                 }
 520
 521                 retry_count += info->status.rates[i].count;
 522         }
 523         if (retry_count < 0)
 524                 retry_count = 0;
 525
 526         rcu_read_lock();
 527
 528         sband = local->hw.wiphy->bands[info->band];
 529
 530         sta = sta_info_get(local, hdr->addr1);
 531
 532         if (sta) {
 533                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 534                     test_sta_flags(sta, WLAN_STA_PS)) {
 535                         /*
 536                          * The STA is in power save mode, so assume
 537                          * that this TX packet failed because of that.
 538                          */
 539                         ieee80211_handle_filtered_frame(local, sta, skb);
 540                         rcu_read_unlock();
 541                         return;
 542                 }
 543
 544                 fc = hdr->frame_control;
 545
 546                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 547                     (ieee80211_is_data_qos(fc))) {
 548                         u16 tid, ssn;
 549                         u8 *qc;
 550
 551                         qc = ieee80211_get_qos_ctl(hdr);
 552                         tid = qc[0] & 0xf;
 553                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 554                                                 & IEEE80211_SCTL_SEQ);
 555                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 556                                            tid, ssn);
 557                 }
 558
 559                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 560                         ieee80211_handle_filtered_frame(local, sta, skb);
 561                         rcu_read_unlock();
 562                         return;
 563                 } else {
 564                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 565                                 sta->tx_retry_failed++;
 566                         sta->tx_retry_count += retry_count;
 567                 }
 568
 569                 rate_control_tx_status(local, sband, sta, skb);
 570         }
 571
 572         rcu_read_unlock();
 573
 574         ieee80211_led_tx(local, 0);
 575
 576         /* SNMP counters
 577          * Fragments are passed to low-level drivers as separate skbs, so these
 578          * are actually fragments, not frames. Update frame counters only for
 579          * the first fragment of the frame. */
 580
 581         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 582         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 583
 584         if (info->flags & IEEE80211_TX_STAT_ACK) {
 585                 if (frag == 0) {
 586                         local->dot11TransmittedFrameCount++;
 587                         if (is_multicast_ether_addr(hdr->addr1))
 588                                 local->dot11MulticastTransmittedFrameCount++;
 589                         if (retry_count > 0)
 590                                 local->dot11RetryCount++;
 591                         if (retry_count > 1)
 592                                 local->dot11MultipleRetryCount++;
 593                 }
 594
 595                 /* This counter shall be incremented for an acknowledged MPDU
 596                  * with an individual address in the address 1 field or an MPDU
 597                  * with a multicast address in the address 1 field of type Data
 598                  * or Management. */
 599                 if (!is_multicast_ether_addr(hdr->addr1) ||
 600                     type == IEEE80211_FTYPE_DATA ||
 601                     type == IEEE80211_FTYPE_MGMT)
 602                         local->dot11TransmittedFragmentCount++;
 603         } else {
 604                 if (frag == 0)
 605                         local->dot11FailedCount++;
 606         }
 607
 608         /* this was a transmitted frame, but now we want to reuse it */
 609         skb_orphan(skb);
 610
 611         /*
 612          * This is a bit racy but we can avoid a lot of work
 613          * with this test...
 614          */
 615         if (!local->monitors && !local->cooked_mntrs) {
 616                 dev_kfree_skb(skb);
 617                 return;
 618         }
 619
 620         /* send frame to monitor interfaces now */
 621
 622         if (skb_headroom(skb) < sizeof(*rthdr)) {
 623                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 624                 dev_kfree_skb(skb);
 625                 return;
 626         }
 627
 628         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 629                                 skb_push(skb, sizeof(*rthdr));
 630
 631         memset(rthdr, 0, sizeof(*rthdr));
 632         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 633         rthdr->hdr.it_present =
 634                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 635                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 636                             (1 << IEEE80211_RADIOTAP_RATE));
 637
 638         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 639             !is_multicast_ether_addr(hdr->addr1))
 640                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 641
 642         /*
 643          * XXX: Once radiotap gets the bitmap reset thing the vendor
 644          *      extensions proposal contains, we can actually report
 645          *      the whole set of tries we did.
 646          */
 647         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 648             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 649                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 650         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 651                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 652         if (info->status.rates[0].idx >= 0 &&
 653             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 654                 rthdr->rate = sband->bitrates[
 655                                 info->status.rates[0].idx].bitrate / 5;
 656
 657         /* for now report the total retry_count */
 658         rthdr->data_retries = retry_count;
 659
 660         /* XXX: is this sufficient for BPF? */
 661         skb_set_mac_header(skb, 0);
 662         skb->ip_summed = CHECKSUM_UNNECESSARY;
 663         skb->pkt_type = PACKET_OTHERHOST;
 664         skb->protocol = htons(ETH_P_802_2);
 665         memset(skb->cb, 0, sizeof(skb->cb));
 666
 667         rcu_read_lock();
 668         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 669                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 670                         if (!netif_running(sdata->dev))
 671                                 continue;
 672
 673                         if (prev_dev) {
 674                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 675                                 if (skb2) {
 676                                         skb2->dev = prev_dev;
 677                                         netif_rx(skb2);
 678                                 }
 679                         }
 680
 681                         prev_dev = sdata->dev;
 682                 }
 683         }
 684         if (prev_dev) {
 685                 skb->dev = prev_dev;
 686                 netif_rx(skb);
 687                 skb = NULL;
 688         }
 689         rcu_read_unlock();
 690         dev_kfree_skb(skb);
 691 }
 692 EXPORT_SYMBOL(ieee80211_tx_status);
 693
 694 static void ieee80211_restart_work(struct work_struct *work)
 695 {
 696         struct ieee80211_local *local =
 697                 container_of(work, struct ieee80211_local, restart_work);
 698
 699         rtnl_lock();
 700         ieee80211_reconfig(local);
 701         rtnl_unlock();
 702 }
 703
 704 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 705 {
 706         struct ieee80211_local *local = hw_to_local(hw);
 707
 708         /* use this reason, __ieee80211_resume will unblock it */
 709         ieee80211_stop_queues_by_reason(hw,
 710                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 711
 712         schedule_work(&local->restart_work);
 713 }
 714 EXPORT_SYMBOL(ieee80211_restart_hw);
 715
 716 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 717                                         const struct ieee80211_ops *ops)
 718 {
 719         struct ieee80211_local *local;
 720         int priv_size, i;
 721         struct wiphy *wiphy;
 722
 723         /* Ensure 32-byte alignment of our private data and hw private data.
 724          * We use the wiphy priv data for both our ieee80211_local and for
 725          * the driver's private data
 726          *
 727          * In memory it'll be like this:
 728          *
 729          * +-------------------------+
 730          * | struct wiphy           |
 731          * +-------------------------+
 732          * | struct ieee80211_local  |
 733          * +-------------------------+
 734          * | driver's private data   |
 735          * +-------------------------+
 736          *
 737          */
 738         priv_size = ((sizeof(struct ieee80211_local) +
 739                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 740                     priv_data_len;
 741
 742         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 743
 744         if (!wiphy)
 745                 return NULL;
 746
 747         wiphy->privid = mac80211_wiphy_privid;
 748
 749         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 750         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 751                                sizeof(struct cfg80211_bss);
 752
 753         local = wiphy_priv(wiphy);
 754
 755         local->hw.wiphy = wiphy;
 756
 757         local->hw.priv = (char *)local +
 758                          ((sizeof(struct ieee80211_local) +
 759                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 760
 761         BUG_ON(!ops->tx);
 762         BUG_ON(!ops->start);
 763         BUG_ON(!ops->stop);
 764         BUG_ON(!ops->config);
 765         BUG_ON(!ops->add_interface);
 766         BUG_ON(!ops->remove_interface);
 767         BUG_ON(!ops->configure_filter);
 768         local->ops = ops;
 769
 770         /* set up some defaults */
 771         local->hw.queues = 1;
 772         local->hw.max_rates = 1;
 773         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 774         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 775         local->hw.conf.radio_enabled = true;
 776         local->user_power_level = -1;
 777
 778         INIT_LIST_HEAD(&local->interfaces);
 779         mutex_init(&local->iflist_mtx);
 780         mutex_init(&local->scan_mtx);
 781
 782         spin_lock_init(&local->key_lock);
 783
 784         spin_lock_init(&local->queue_stop_reason_lock);
 785
 786         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 787
 788         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 789
 790         INIT_WORK(&local->dynamic_ps_enable_work,
 791                   ieee80211_dynamic_ps_enable_work);
 792         INIT_WORK(&local->dynamic_ps_disable_work,
 793                   ieee80211_dynamic_ps_disable_work);
 794         setup_timer(&local->dynamic_ps_timer,
 795                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 796
 797         sta_info_init(local);
 798
 799         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 800                 skb_queue_head_init(&local->pending[i]);
 801         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 802                      (unsigned long)local);
 803         tasklet_disable(&local->tx_pending_tasklet);
 804
 805         tasklet_init(&local->tasklet,
 806                      ieee80211_tasklet_handler,
 807                      (unsigned long) local);
 808         tasklet_disable(&local->tasklet);
 809
 810         skb_queue_head_init(&local->skb_queue);
 811         skb_queue_head_init(&local->skb_queue_unreliable);
 812
 813         spin_lock_init(&local->ampdu_lock);
 814
 815         return local_to_hw(local);
 816 }
 817 EXPORT_SYMBOL(ieee80211_alloc_hw);
 818
 819 static const struct net_device_ops ieee80211_master_ops = {
 820         .ndo_start_xmit = ieee80211_master_start_xmit,
 821         .ndo_open = ieee80211_master_open,
 822         .ndo_stop = ieee80211_master_stop,
 823         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 824         .ndo_select_queue = ieee80211_select_queue,
 825 };
 826
 827 static void ieee80211_master_setup(struct net_device *mdev)
 828 {
 829         mdev->type = ARPHRD_IEEE80211;
 830         mdev->netdev_ops = &ieee80211_master_ops;
 831         mdev->header_ops = &ieee80211_header_ops;
 832         mdev->tx_queue_len = 1000;
 833         mdev->addr_len = ETH_ALEN;
 834 }
 835
 836 int ieee80211_register_hw(struct ieee80211_hw *hw)
 837 {
 838         struct ieee80211_local *local = hw_to_local(hw);
 839         int result;
 840         enum ieee80211_band band;
 841         struct net_device *mdev;
 842         struct ieee80211_master_priv *mpriv;
 843         int channels, i, j, max_bitrates;
 844         bool supp_ht;
 845         static const u32 cipher_suites[] = {
 846                 WLAN_CIPHER_SUITE_WEP40,
 847                 WLAN_CIPHER_SUITE_WEP104,
 848                 WLAN_CIPHER_SUITE_TKIP,
 849                 WLAN_CIPHER_SUITE_CCMP,
 850
 851                 /* keep last -- depends on hw flags! */
 852                 WLAN_CIPHER_SUITE_AES_CMAC
 853         };
 854
 855         /*
 856          * generic code guarantees at least one band,
 857          * set this very early because much code assumes
 858          * that hw.conf.channel is assigned
 859          */
 860         channels = 0;
 861         max_bitrates = 0;
 862         supp_ht = false;
 863         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 864                 struct ieee80211_supported_band *sband;
 865
 866                 sband = local->hw.wiphy->bands[band];
 867                 if (!sband)
 868                         continue;
 869                 if (!local->oper_channel) {
 870                         /* init channel we're on */
 871                         local->hw.conf.channel =
 872                         local->oper_channel = &sband->channels[0];
 873                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 874                 }
 875                 channels += sband->n_channels;
 876
 877                 if (max_bitrates < sband->n_bitrates)
 878                         max_bitrates = sband->n_bitrates;
 879                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 880         }
 881
 882         local->int_scan_req.n_channels = channels;
 883         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 884         if (!local->int_scan_req.channels)
 885                 return -ENOMEM;
 886
 887         /* if low-level driver supports AP, we also support VLAN */
 888         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 889                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 890
 891         /* mac80211 always supports monitor */
 892         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 893
 894         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 895                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 896         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 897                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 898
 899         /*
 900          * Calculate scan IE length -- we need this to alloc
 901          * memory and to subtract from the driver limit. It
 902          * includes the (extended) supported rates and HT
 903          * information -- SSID is the driver's responsibility.
 904          */
 905         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 906         if (supp_ht)
 907                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 908
 909         if (!local->ops->hw_scan) {
 910                 /* For hw_scan, driver needs to set these up. */
 911                 local->hw.wiphy->max_scan_ssids = 4;
 912                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 913         }
 914
 915         /*
 916          * If the driver supports any scan IEs, then assume the
 917          * limit includes the IEs mac80211 will add, otherwise
 918          * leave it at zero and let the driver sort it out; we
 919          * still pass our IEs to the driver but userspace will
 920          * not be allowed to in that case.
 921          */
 922         if (local->hw.wiphy->max_scan_ie_len)
 923                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 924
 925         local->hw.wiphy->cipher_suites = cipher_suites;
 926         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 927         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 928                 local->hw.wiphy->n_cipher_suites--;
 929
 930         result = wiphy_register(local->hw.wiphy);
 931         if (result < 0)
 932                 goto fail_wiphy_register;
 933
 934         /*
 935          * We use the number of queues for feature tests (QoS, HT) internally
 936          * so restrict them appropriately.
 937          */
 938         if (hw->queues > IEEE80211_MAX_QUEUES)
 939                 hw->queues = IEEE80211_MAX_QUEUES;
 940
 941         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 942                                "wmaster%d", ieee80211_master_setup,
 943                                hw->queues);
 944         if (!mdev)
 945                 goto fail_mdev_alloc;
 946
 947         mpriv = netdev_priv(mdev);
 948         mpriv->local = local;
 949         local->mdev = mdev;
 950
 951         local->hw.workqueue =
 952                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 953         if (!local->hw.workqueue) {
 954                 result = -ENOMEM;
 955                 goto fail_workqueue;
 956         }
 957
 958         /*
 959          * The hardware needs headroom for sending the frame,
 960          * and we need some headroom for passing the frame to monitor
 961          * interfaces, but never both at the same time.
 962          */
 963         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 964                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 965
 966         debugfs_hw_add(local);
 967
 968         if (local->hw.max_listen_interval == 0)
 969                 local->hw.max_listen_interval = 1;
 970
 971         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 972
 973         result = sta_info_start(local);
 974         if (result < 0)
 975                 goto fail_sta_info;
 976
 977         result = ieee80211_wep_init(local);
 978         if (result < 0) {
 979                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 980                        wiphy_name(local->hw.wiphy), result);
 981                 goto fail_wep;
 982         }
 983
 984         rtnl_lock();
 985         result = dev_alloc_name(local->mdev, local->mdev->name);
 986         if (result < 0)
 987                 goto fail_dev;
 988
 989         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 990         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 991         local->mdev->features |= NETIF_F_NETNS_LOCAL;
 992
 993         result = register_netdevice(local->mdev);
 994         if (result < 0)
 995                 goto fail_dev;
 996
 997         result = ieee80211_init_rate_ctrl_alg(local,
 998                                               hw->rate_control_algorithm);
 999         if (result < 0) {
1000                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1001                        "algorithm\n", wiphy_name(local->hw.wiphy));
1002                 goto fail_rate;
1003         }
1004
1005         /* add one default STA interface if supported */
1006         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1007                 result = ieee80211_if_add(local, "wlan%d", NULL,
1008                                           NL80211_IFTYPE_STATION, NULL);
1009                 if (result)
1010                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1011                                wiphy_name(local->hw.wiphy));
1012         }
1013
1014         rtnl_unlock();
1015
1016         ieee80211_led_init(local);
1017
1018         /* alloc internal scan request */
1019         i = 0;
1020         local->int_scan_req.ssids = &local->scan_ssid;
1021         local->int_scan_req.n_ssids = 1;
1022         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1023                 if (!hw->wiphy->bands[band])
1024                         continue;
1025                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1026                         local->int_scan_req.channels[i] =
1027                                 &hw->wiphy->bands[band]->channels[j];
1028                         i++;
1029                 }
1030         }
1031
1032         local->network_latency_notifier.notifier_call =
1033                 ieee80211_max_network_latency;
1034         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1035                                      &local->network_latency_notifier);
1036
1037         if (result) {
1038                 rtnl_lock();
1039                 goto fail_pm_qos;
1040         }
1041
1042         return 0;
1043
1044  fail_pm_qos:
1045         ieee80211_led_exit(local);
1046         ieee80211_remove_interfaces(local);
1047  fail_rate:
1048         unregister_netdevice(local->mdev);
1049         local->mdev = NULL;
1050  fail_dev:
1051         rtnl_unlock();
1052         ieee80211_wep_free(local);
1053  fail_wep:
1054         sta_info_stop(local);
1055  fail_sta_info:
1056         debugfs_hw_del(local);
1057         destroy_workqueue(local->hw.workqueue);
1058  fail_workqueue:
1059         if (local->mdev)
1060                 free_netdev(local->mdev);
1061  fail_mdev_alloc:
1062         wiphy_unregister(local->hw.wiphy);
1063  fail_wiphy_register:
1064         kfree(local->int_scan_req.channels);
1065         return result;
1066 }
1067 EXPORT_SYMBOL(ieee80211_register_hw);
1068
1069 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1070 {
1071         struct ieee80211_local *local = hw_to_local(hw);
1072
1073         tasklet_kill(&local->tx_pending_tasklet);
1074         tasklet_kill(&local->tasklet);
1075
1076         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1077                                &local->network_latency_notifier);
1078
1079         rtnl_lock();
1080
1081         /*
1082          * At this point, interface list manipulations are fine
1083          * because the driver cannot be handing us frames any
1084          * more and the tasklet is killed.
1085          */
1086
1087         /* First, we remove all virtual interfaces. */
1088         ieee80211_remove_interfaces(local);
1089
1090         /* then, finally, remove the master interface */
1091         unregister_netdevice(local->mdev);
1092
1093         rtnl_unlock();
1094
1095         ieee80211_clear_tx_pending(local);
1096         sta_info_stop(local);
1097         rate_control_deinitialize(local);
1098         debugfs_hw_del(local);
1099
1100         if (skb_queue_len(&local->skb_queue)
1101                         || skb_queue_len(&local->skb_queue_unreliable))
1102                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1103                        wiphy_name(local->hw.wiphy));
1104         skb_queue_purge(&local->skb_queue);
1105         skb_queue_purge(&local->skb_queue_unreliable);
1106
1107         destroy_workqueue(local->hw.workqueue);
1108         wiphy_unregister(local->hw.wiphy);
1109         ieee80211_wep_free(local);
1110         ieee80211_led_exit(local);
1111         free_netdev(local->mdev);
1112         kfree(local->int_scan_req.channels);
1113 }
1114 EXPORT_SYMBOL(ieee80211_unregister_hw);
1115
1116 void ieee80211_free_hw(struct ieee80211_hw *hw)
1117 {
1118         struct ieee80211_local *local = hw_to_local(hw);
1119
1120         mutex_destroy(&local->iflist_mtx);
1121         mutex_destroy(&local->scan_mtx);
1122
1123         wiphy_free(local->hw.wiphy);
1124 }
1125 EXPORT_SYMBOL(ieee80211_free_hw);
1126
1127 static int __init ieee80211_init(void)
1128 {
1129         struct sk_buff *skb;
1130         int ret;
1131
1132         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1133         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1134                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1135
1136         ret = rc80211_minstrel_init();
1137         if (ret)
1138                 return ret;
1139
1140         ret = rc80211_pid_init();
1141         if (ret)
1142                 return ret;
1143
1144         ieee80211_debugfs_netdev_init();
1145
1146         return 0;
1147 }
1148
1149 static void __exit ieee80211_exit(void)
1150 {
1151         rc80211_pid_exit();
1152         rc80211_minstrel_exit();
1153
1154         /*
1155          * For key todo, it'll be empty by now but the work
1156          * might still be scheduled.
1157          */
1158         flush_scheduled_work();
1159
1160         if (mesh_allocated)
1161                 ieee80211s_stop();
1162
1163         ieee80211_debugfs_netdev_exit();
1164 }
1165
1166
1167 subsys_initcall(ieee80211_init);
1168 module_exit(ieee80211_exit);
1169
1170 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1171 MODULE_LICENSE("GPL");