net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <linux/pm_qos_params.h>
  25 #include <net/net_namespace.h>
  26 #include <net/cfg80211.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "wme.h"
  33 #include "aes_ccm.h"
  34 #include "led.h"
  35 #include "cfg.h"
  36 #include "debugfs.h"
  37 #include "debugfs_netdev.h"
  38
  39 /*
  40  * For seeing transmitted packets on monitor interfaces
  41  * we have a radiotap header too.
  42  */
  43 struct ieee80211_tx_status_rtap_hdr {
  44         struct ieee80211_radiotap_header hdr;
  45         u8 rate;
  46         u8 padding_for_rate;
  47         __le16 tx_flags;
  48         u8 data_retries;
  49 } __attribute__ ((packed));
  50
  51
  52 /* must be called under mdev tx lock */
  53 void ieee80211_configure_filter(struct ieee80211_local *local)
  54 {
  55         unsigned int changed_flags;
  56         unsigned int new_flags = 0;
  57
  58         if (atomic_read(&local->iff_promiscs))
  59                 new_flags |= FIF_PROMISC_IN_BSS;
  60
  61         if (atomic_read(&local->iff_allmultis))
  62                 new_flags |= FIF_ALLMULTI;
  63
  64         if (local->monitors)
  65                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  66
  67         if (local->fif_fcsfail)
  68                 new_flags |= FIF_FCSFAIL;
  69
  70         if (local->fif_plcpfail)
  71                 new_flags |= FIF_PLCPFAIL;
  72
  73         if (local->fif_control)
  74                 new_flags |= FIF_CONTROL;
  75
  76         if (local->fif_other_bss)
  77                 new_flags |= FIF_OTHER_BSS;
  78
  79         changed_flags = local->filter_flags ^ new_flags;
  80
  81         /* be a bit nasty */
  82         new_flags |= (1<<31);
  83
  84         local->ops->configure_filter(local_to_hw(local),
  85                                      changed_flags, &new_flags,
  86                                      local->mdev->mc_count,
  87                                      local->mdev->mc_list);
  88
  89         WARN_ON(new_flags & (1<<31));
  90
  91         local->filter_flags = new_flags & ~(1<<31);
  92 }
  93
  94 /* master interface */
  95
  96 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  97 {
  98         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  99         return ETH_ALEN;
 100 }
 101
 102 static const struct header_ops ieee80211_header_ops = {
 103         .create         = eth_header,
 104         .parse          = header_parse_80211,
 105         .rebuild        = eth_rebuild_header,
 106         .cache          = eth_header_cache,
 107         .cache_update   = eth_header_cache_update,
 108 };
 109
 110 static int ieee80211_master_open(struct net_device *dev)
 111 {
 112         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 113         struct ieee80211_local *local = mpriv->local;
 114         struct ieee80211_sub_if_data *sdata;
 115         int res = -EOPNOTSUPP;
 116
 117         /* we hold the RTNL here so can safely walk the list */
 118         list_for_each_entry(sdata, &local->interfaces, list) {
 119                 if (netif_running(sdata->dev)) {
 120                         res = 0;
 121                         break;
 122                 }
 123         }
 124
 125         if (res)
 126                 return res;
 127
 128         netif_tx_start_all_queues(local->mdev);
 129
 130         return 0;
 131 }
 132
 133 static int ieee80211_master_stop(struct net_device *dev)
 134 {
 135         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 136         struct ieee80211_local *local = mpriv->local;
 137         struct ieee80211_sub_if_data *sdata;
 138
 139         /* we hold the RTNL here so can safely walk the list */
 140         list_for_each_entry(sdata, &local->interfaces, list)
 141                 if (netif_running(sdata->dev))
 142                         dev_close(sdata->dev);
 143
 144         return 0;
 145 }
 146
 147 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 148 {
 149         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 150         struct ieee80211_local *local = mpriv->local;
 151
 152         ieee80211_configure_filter(local);
 153 }
 154
 155 /* everything else */
 156
 157 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 158 {
 159         struct ieee80211_local *local = sdata->local;
 160         struct ieee80211_if_conf conf;
 161
 162         if (WARN_ON(!netif_running(sdata->dev)))
 163                 return 0;
 164
 165         memset(&conf, 0, sizeof(conf));
 166
 167         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 168                 conf.bssid = sdata->u.mgd.bssid;
 169         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 170                 conf.bssid = sdata->u.ibss.bssid;
 171         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 172                 conf.bssid = sdata->dev->dev_addr;
 173         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 174                 static const u8 zero[ETH_ALEN] = { 0 };
 175                 conf.bssid = zero;
 176         } else {
 177                 WARN_ON(1);
 178                 return -EINVAL;
 179         }
 180
 181         if (!local->ops->config_interface)
 182                 return 0;
 183
 184         switch (sdata->vif.type) {
 185         case NL80211_IFTYPE_AP:
 186         case NL80211_IFTYPE_ADHOC:
 187         case NL80211_IFTYPE_MESH_POINT:
 188                 break;
 189         default:
 190                 /* do not warn to simplify caller in scan.c */
 191                 changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
 192                 if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
 193                         return -EINVAL;
 194                 changed &= ~IEEE80211_IFCC_BEACON;
 195                 break;
 196         }
 197
 198         if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
 199                 if (local->sw_scanning) {
 200                         conf.enable_beacon = false;
 201                 } else {
 202                         /*
 203                          * Beacon should be enabled, but AP mode must
 204                          * check whether there is a beacon configured.
 205                          */
 206                         switch (sdata->vif.type) {
 207                         case NL80211_IFTYPE_AP:
 208                                 conf.enable_beacon =
 209                                         !!rcu_dereference(sdata->u.ap.beacon);
 210                                 break;
 211                         case NL80211_IFTYPE_ADHOC:
 212                                 conf.enable_beacon = !!sdata->u.ibss.presp;
 213                                 break;
 214                         case NL80211_IFTYPE_MESH_POINT:
 215                                 conf.enable_beacon = true;
 216                                 break;
 217                         default:
 218                                 /* not reached */
 219                                 WARN_ON(1);
 220                                 break;
 221                         }
 222                 }
 223         }
 224
 225         conf.changed = changed;
 226
 227         return local->ops->config_interface(local_to_hw(local),
 228                                             &sdata->vif, &conf);
 229 }
 230
 231 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 232 {
 233         struct ieee80211_channel *chan;
 234         int ret = 0;
 235         int power;
 236         enum nl80211_channel_type channel_type;
 237
 238         might_sleep();
 239
 240         if (local->sw_scanning) {
 241                 chan = local->scan_channel;
 242                 channel_type = NL80211_CHAN_NO_HT;
 243         } else {
 244                 chan = local->oper_channel;
 245                 channel_type = local->oper_channel_type;
 246         }
 247
 248         if (chan != local->hw.conf.channel ||
 249             channel_type != local->hw.conf.channel_type) {
 250                 local->hw.conf.channel = chan;
 251                 local->hw.conf.channel_type = channel_type;
 252                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 253         }
 254
 255         if (local->sw_scanning)
 256                 power = chan->max_power;
 257         else
 258                 power = local->power_constr_level ?
 259                         (chan->max_power - local->power_constr_level) :
 260                         chan->max_power;
 261
 262         if (local->user_power_level >= 0)
 263                 power = min(power, local->user_power_level);
 264
 265         if (local->hw.conf.power_level != power) {
 266                 changed |= IEEE80211_CONF_CHANGE_POWER;
 267                 local->hw.conf.power_level = power;
 268         }
 269
 270         if (changed && local->open_count) {
 271                 ret = local->ops->config(local_to_hw(local), changed);
 272                 /*
 273                  * Goal:
 274                  * HW reconfiguration should never fail, the driver has told
 275                  * us what it can support so it should live up to that promise.
 276                  *
 277                  * Current status:
 278                  * rfkill is not integrated with mac80211 and a
 279                  * configuration command can thus fail if hardware rfkill
 280                  * is enabled
 281                  *
 282                  * FIXME: integrate rfkill with mac80211 and then add this
 283                  * WARN_ON() back
 284                  *
 285                  */
 286                 /* WARN_ON(ret); */
 287         }
 288
 289         return ret;
 290 }
 291
 292 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 293                                       u32 changed)
 294 {
 295         struct ieee80211_local *local = sdata->local;
 296
 297         if (!changed)
 298                 return;
 299
 300         if (local->ops->bss_info_changed)
 301                 local->ops->bss_info_changed(local_to_hw(local),
 302                                              &sdata->vif,
 303                                              &sdata->vif.bss_conf,
 304                                              changed);
 305
 306         /*
 307          * DEPRECATED
 308          *
 309          * ~changed is just there to not do this at resume time
 310          */
 311         if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
 312                 local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
 313                 ieee80211_hw_config(local,
 314                                     _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
 315         }
 316 }
 317
 318 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 319 {
 320         sdata->vif.bss_conf.use_cts_prot = false;
 321         sdata->vif.bss_conf.use_short_preamble = false;
 322         sdata->vif.bss_conf.use_short_slot = false;
 323         return BSS_CHANGED_ERP_CTS_PROT |
 324                BSS_CHANGED_ERP_PREAMBLE |
 325                BSS_CHANGED_ERP_SLOT;
 326 }
 327
 328 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 329                                  struct sk_buff *skb)
 330 {
 331         struct ieee80211_local *local = hw_to_local(hw);
 332         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 333         int tmp;
 334
 335         skb->dev = local->mdev;
 336         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 337         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 338                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 339         tmp = skb_queue_len(&local->skb_queue) +
 340                 skb_queue_len(&local->skb_queue_unreliable);
 341         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 342                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 343                 dev_kfree_skb_irq(skb);
 344                 tmp--;
 345                 I802_DEBUG_INC(local->tx_status_drop);
 346         }
 347         tasklet_schedule(&local->tasklet);
 348 }
 349 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 350
 351 static void ieee80211_tasklet_handler(unsigned long data)
 352 {
 353         struct ieee80211_local *local = (struct ieee80211_local *) data;
 354         struct sk_buff *skb;
 355         struct ieee80211_rx_status rx_status;
 356         struct ieee80211_ra_tid *ra_tid;
 357
 358         while ((skb = skb_dequeue(&local->skb_queue)) ||
 359                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 360                 switch (skb->pkt_type) {
 361                 case IEEE80211_RX_MSG:
 362                         /* status is in skb->cb */
 363                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 364                         /* Clear skb->pkt_type in order to not confuse kernel
 365                          * netstack. */
 366                         skb->pkt_type = 0;
 367                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 368                         break;
 369                 case IEEE80211_TX_STATUS_MSG:
 370                         skb->pkt_type = 0;
 371                         ieee80211_tx_status(local_to_hw(local), skb);
 372                         break;
 373                 case IEEE80211_DELBA_MSG:
 374                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 375                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 376                                                 ra_tid->ra, ra_tid->tid);
 377                         dev_kfree_skb(skb);
 378                         break;
 379                 case IEEE80211_ADDBA_MSG:
 380                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 381                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 382                                                  ra_tid->ra, ra_tid->tid);
 383                         dev_kfree_skb(skb);
 384                         break ;
 385                 default:
 386                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 387                              skb->pkt_type);
 388                         dev_kfree_skb(skb);
 389                         break;
 390                 }
 391         }
 392 }
 393
 394 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 395  * make a prepared TX frame (one that has been given to hw) to look like brand
 396  * new IEEE 802.11 frame that is ready to go through TX processing again.
 397  */
 398 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 399                                       struct ieee80211_key *key,
 400                                       struct sk_buff *skb)
 401 {
 402         unsigned int hdrlen, iv_len, mic_len;
 403         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 404
 405         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 406
 407         if (!key)
 408                 goto no_key;
 409
 410         switch (key->conf.alg) {
 411         case ALG_WEP:
 412                 iv_len = WEP_IV_LEN;
 413                 mic_len = WEP_ICV_LEN;
 414                 break;
 415         case ALG_TKIP:
 416                 iv_len = TKIP_IV_LEN;
 417                 mic_len = TKIP_ICV_LEN;
 418                 break;
 419         case ALG_CCMP:
 420                 iv_len = CCMP_HDR_LEN;
 421                 mic_len = CCMP_MIC_LEN;
 422                 break;
 423         default:
 424                 goto no_key;
 425         }
 426
 427         if (skb->len >= hdrlen + mic_len &&
 428             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 429                 skb_trim(skb, skb->len - mic_len);
 430         if (skb->len >= hdrlen + iv_len) {
 431                 memmove(skb->data + iv_len, skb->data, hdrlen);
 432                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 433         }
 434
 435 no_key:
 436         if (ieee80211_is_data_qos(hdr->frame_control)) {
 437                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 438                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 439                         hdrlen - IEEE80211_QOS_CTL_LEN);
 440                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 441         }
 442 }
 443
 444 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 445                                             struct sta_info *sta,
 446                                             struct sk_buff *skb)
 447 {
 448         sta->tx_filtered_count++;
 449
 450         /*
 451          * Clear the TX filter mask for this STA when sending the next
 452          * packet. If the STA went to power save mode, this will happen
 453          * when it wakes up for the next time.
 454          */
 455         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 456
 457         /*
 458          * This code races in the following way:
 459          *
 460          *  (1) STA sends frame indicating it will go to sleep and does so
 461          *  (2) hardware/firmware adds STA to filter list, passes frame up
 462          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 463          *  (4) we get TX status before having processed the frame and
 464          *      knowing that the STA has gone to sleep.
 465          *
 466          * This is actually quite unlikely even when both those events are
 467          * processed from interrupts coming in quickly after one another or
 468          * even at the same time because we queue both TX status events and
 469          * RX frames to be processed by a tasklet and process them in the
 470          * same order that they were received or TX status last. Hence, there
 471          * is no race as long as the frame RX is processed before the next TX
 472          * status, which drivers can ensure, see below.
 473          *
 474          * Note that this can only happen if the hardware or firmware can
 475          * actually add STAs to the filter list, if this is done by the
 476          * driver in response to set_tim() (which will only reduce the race
 477          * this whole filtering tries to solve, not completely solve it)
 478          * this situation cannot happen.
 479          *
 480          * To completely solve this race drivers need to make sure that they
 481          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 482          *      functions and
 483          *  (b) always process RX events before TX status events if ordering
 484          *      can be unknown, for example with different interrupt status
 485          *      bits.
 486          */
 487         if (test_sta_flags(sta, WLAN_STA_PS) &&
 488             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 489                 ieee80211_remove_tx_extra(local, sta->key, skb);
 490                 skb_queue_tail(&sta->tx_filtered, skb);
 491                 return;
 492         }
 493
 494         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 495                 /* Software retry the packet once */
 496                 skb->requeue = 1;
 497                 ieee80211_remove_tx_extra(local, sta->key, skb);
 498                 dev_queue_xmit(skb);
 499                 return;
 500         }
 501
 502 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 503         if (net_ratelimit())
 504                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 505                        "queue_len=%d PS=%d @%lu\n",
 506                        wiphy_name(local->hw.wiphy),
 507                        skb_queue_len(&sta->tx_filtered),
 508                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 509 #endif
 510         dev_kfree_skb(skb);
 511 }
 512
 513 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 514 {
 515         struct sk_buff *skb2;
 516         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 517         struct ieee80211_local *local = hw_to_local(hw);
 518         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 519         u16 frag, type;
 520         __le16 fc;
 521         struct ieee80211_supported_band *sband;
 522         struct ieee80211_tx_status_rtap_hdr *rthdr;
 523         struct ieee80211_sub_if_data *sdata;
 524         struct net_device *prev_dev = NULL;
 525         struct sta_info *sta;
 526         int retry_count = -1, i;
 527
 528         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 529                 /* the HW cannot have attempted that rate */
 530                 if (i >= hw->max_rates) {
 531                         info->status.rates[i].idx = -1;
 532                         info->status.rates[i].count = 0;
 533                 }
 534
 535                 retry_count += info->status.rates[i].count;
 536         }
 537         if (retry_count < 0)
 538                 retry_count = 0;
 539
 540         rcu_read_lock();
 541
 542         sband = local->hw.wiphy->bands[info->band];
 543
 544         sta = sta_info_get(local, hdr->addr1);
 545
 546         if (sta) {
 547                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 548                     test_sta_flags(sta, WLAN_STA_PS)) {
 549                         /*
 550                          * The STA is in power save mode, so assume
 551                          * that this TX packet failed because of that.
 552                          */
 553                         ieee80211_handle_filtered_frame(local, sta, skb);
 554                         rcu_read_unlock();
 555                         return;
 556                 }
 557
 558                 fc = hdr->frame_control;
 559
 560                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 561                     (ieee80211_is_data_qos(fc))) {
 562                         u16 tid, ssn;
 563                         u8 *qc;
 564
 565                         qc = ieee80211_get_qos_ctl(hdr);
 566                         tid = qc[0] & 0xf;
 567                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 568                                                 & IEEE80211_SCTL_SEQ);
 569                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 570                                            tid, ssn);
 571                 }
 572
 573                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 574                         ieee80211_handle_filtered_frame(local, sta, skb);
 575                         rcu_read_unlock();
 576                         return;
 577                 } else {
 578                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 579                                 sta->tx_retry_failed++;
 580                         sta->tx_retry_count += retry_count;
 581                 }
 582
 583                 rate_control_tx_status(local, sband, sta, skb);
 584         }
 585
 586         rcu_read_unlock();
 587
 588         ieee80211_led_tx(local, 0);
 589
 590         /* SNMP counters
 591          * Fragments are passed to low-level drivers as separate skbs, so these
 592          * are actually fragments, not frames. Update frame counters only for
 593          * the first fragment of the frame. */
 594
 595         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 596         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 597
 598         if (info->flags & IEEE80211_TX_STAT_ACK) {
 599                 if (frag == 0) {
 600                         local->dot11TransmittedFrameCount++;
 601                         if (is_multicast_ether_addr(hdr->addr1))
 602                                 local->dot11MulticastTransmittedFrameCount++;
 603                         if (retry_count > 0)
 604                                 local->dot11RetryCount++;
 605                         if (retry_count > 1)
 606                                 local->dot11MultipleRetryCount++;
 607                 }
 608
 609                 /* This counter shall be incremented for an acknowledged MPDU
 610                  * with an individual address in the address 1 field or an MPDU
 611                  * with a multicast address in the address 1 field of type Data
 612                  * or Management. */
 613                 if (!is_multicast_ether_addr(hdr->addr1) ||
 614                     type == IEEE80211_FTYPE_DATA ||
 615                     type == IEEE80211_FTYPE_MGMT)
 616                         local->dot11TransmittedFragmentCount++;
 617         } else {
 618                 if (frag == 0)
 619                         local->dot11FailedCount++;
 620         }
 621
 622         /* this was a transmitted frame, but now we want to reuse it */
 623         skb_orphan(skb);
 624
 625         /*
 626          * This is a bit racy but we can avoid a lot of work
 627          * with this test...
 628          */
 629         if (!local->monitors && !local->cooked_mntrs) {
 630                 dev_kfree_skb(skb);
 631                 return;
 632         }
 633
 634         /* send frame to monitor interfaces now */
 635
 636         if (skb_headroom(skb) < sizeof(*rthdr)) {
 637                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 638                 dev_kfree_skb(skb);
 639                 return;
 640         }
 641
 642         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 643                                 skb_push(skb, sizeof(*rthdr));
 644
 645         memset(rthdr, 0, sizeof(*rthdr));
 646         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 647         rthdr->hdr.it_present =
 648                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 649                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 650                             (1 << IEEE80211_RADIOTAP_RATE));
 651
 652         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 653             !is_multicast_ether_addr(hdr->addr1))
 654                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 655
 656         /*
 657          * XXX: Once radiotap gets the bitmap reset thing the vendor
 658          *      extensions proposal contains, we can actually report
 659          *      the whole set of tries we did.
 660          */
 661         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 662             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 663                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 664         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 665                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 666         if (info->status.rates[0].idx >= 0 &&
 667             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 668                 rthdr->rate = sband->bitrates[
 669                                 info->status.rates[0].idx].bitrate / 5;
 670
 671         /* for now report the total retry_count */
 672         rthdr->data_retries = retry_count;
 673
 674         /* XXX: is this sufficient for BPF? */
 675         skb_set_mac_header(skb, 0);
 676         skb->ip_summed = CHECKSUM_UNNECESSARY;
 677         skb->pkt_type = PACKET_OTHERHOST;
 678         skb->protocol = htons(ETH_P_802_2);
 679         memset(skb->cb, 0, sizeof(skb->cb));
 680
 681         rcu_read_lock();
 682         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 683                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 684                         if (!netif_running(sdata->dev))
 685                                 continue;
 686
 687                         if (prev_dev) {
 688                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 689                                 if (skb2) {
 690                                         skb2->dev = prev_dev;
 691                                         netif_rx(skb2);
 692                                 }
 693                         }
 694
 695                         prev_dev = sdata->dev;
 696                 }
 697         }
 698         if (prev_dev) {
 699                 skb->dev = prev_dev;
 700                 netif_rx(skb);
 701                 skb = NULL;
 702         }
 703         rcu_read_unlock();
 704         dev_kfree_skb(skb);
 705 }
 706 EXPORT_SYMBOL(ieee80211_tx_status);
 707
 708 static void ieee80211_restart_work(struct work_struct *work)
 709 {
 710         struct ieee80211_local *local =
 711                 container_of(work, struct ieee80211_local, restart_work);
 712
 713         rtnl_lock();
 714         ieee80211_reconfig(local);
 715         rtnl_unlock();
 716 }
 717
 718 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 719 {
 720         struct ieee80211_local *local = hw_to_local(hw);
 721
 722         /* use this reason, __ieee80211_resume will unblock it */
 723         ieee80211_stop_queues_by_reason(hw,
 724                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 725
 726         schedule_work(&local->restart_work);
 727 }
 728 EXPORT_SYMBOL(ieee80211_restart_hw);
 729
 730 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 731                                         const struct ieee80211_ops *ops)
 732 {
 733         struct ieee80211_local *local;
 734         int priv_size, i;
 735         struct wiphy *wiphy;
 736
 737         /* Ensure 32-byte alignment of our private data and hw private data.
 738          * We use the wiphy priv data for both our ieee80211_local and for
 739          * the driver's private data
 740          *
 741          * In memory it'll be like this:
 742          *
 743          * +-------------------------+
 744          * | struct wiphy           |
 745          * +-------------------------+
 746          * | struct ieee80211_local  |
 747          * +-------------------------+
 748          * | driver's private data   |
 749          * +-------------------------+
 750          *
 751          */
 752         priv_size = ((sizeof(struct ieee80211_local) +
 753                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 754                     priv_data_len;
 755
 756         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 757
 758         if (!wiphy)
 759                 return NULL;
 760
 761         wiphy->privid = mac80211_wiphy_privid;
 762
 763         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 764         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 765                                sizeof(struct cfg80211_bss);
 766
 767         local = wiphy_priv(wiphy);
 768
 769         local->hw.wiphy = wiphy;
 770
 771         local->hw.priv = (char *)local +
 772                          ((sizeof(struct ieee80211_local) +
 773                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 774
 775         BUG_ON(!ops->tx);
 776         BUG_ON(!ops->start);
 777         BUG_ON(!ops->stop);
 778         BUG_ON(!ops->config);
 779         BUG_ON(!ops->add_interface);
 780         BUG_ON(!ops->remove_interface);
 781         BUG_ON(!ops->configure_filter);
 782         local->ops = ops;
 783
 784         /* set up some defaults */
 785         local->hw.queues = 1;
 786         local->hw.max_rates = 1;
 787         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 788         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 789         local->hw.conf.radio_enabled = true;
 790         local->user_power_level = -1;
 791
 792         INIT_LIST_HEAD(&local->interfaces);
 793         mutex_init(&local->iflist_mtx);
 794         mutex_init(&local->scan_mtx);
 795
 796         spin_lock_init(&local->key_lock);
 797
 798         spin_lock_init(&local->queue_stop_reason_lock);
 799
 800         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 801
 802         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 803
 804         INIT_WORK(&local->dynamic_ps_enable_work,
 805                   ieee80211_dynamic_ps_enable_work);
 806         INIT_WORK(&local->dynamic_ps_disable_work,
 807                   ieee80211_dynamic_ps_disable_work);
 808         setup_timer(&local->dynamic_ps_timer,
 809                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 810
 811         sta_info_init(local);
 812
 813         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 814                 skb_queue_head_init(&local->pending[i]);
 815         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 816                      (unsigned long)local);
 817         tasklet_disable(&local->tx_pending_tasklet);
 818
 819         tasklet_init(&local->tasklet,
 820                      ieee80211_tasklet_handler,
 821                      (unsigned long) local);
 822         tasklet_disable(&local->tasklet);
 823
 824         skb_queue_head_init(&local->skb_queue);
 825         skb_queue_head_init(&local->skb_queue_unreliable);
 826
 827         spin_lock_init(&local->ampdu_lock);
 828
 829         return local_to_hw(local);
 830 }
 831 EXPORT_SYMBOL(ieee80211_alloc_hw);
 832
 833 static const struct net_device_ops ieee80211_master_ops = {
 834         .ndo_start_xmit = ieee80211_master_start_xmit,
 835         .ndo_open = ieee80211_master_open,
 836         .ndo_stop = ieee80211_master_stop,
 837         .ndo_set_multicast_list = ieee80211_master_set_multicast_list,
 838         .ndo_select_queue = ieee80211_select_queue,
 839 };
 840
 841 static void ieee80211_master_setup(struct net_device *mdev)
 842 {
 843         mdev->type = ARPHRD_IEEE80211;
 844         mdev->netdev_ops = &ieee80211_master_ops;
 845         mdev->header_ops = &ieee80211_header_ops;
 846         mdev->tx_queue_len = 1000;
 847         mdev->addr_len = ETH_ALEN;
 848 }
 849
 850 int ieee80211_register_hw(struct ieee80211_hw *hw)
 851 {
 852         struct ieee80211_local *local = hw_to_local(hw);
 853         int result;
 854         enum ieee80211_band band;
 855         struct net_device *mdev;
 856         struct ieee80211_master_priv *mpriv;
 857         int channels, i, j, max_bitrates;
 858         bool supp_ht;
 859         static const u32 cipher_suites[] = {
 860                 WLAN_CIPHER_SUITE_WEP40,
 861                 WLAN_CIPHER_SUITE_WEP104,
 862                 WLAN_CIPHER_SUITE_TKIP,
 863                 WLAN_CIPHER_SUITE_CCMP,
 864
 865                 /* keep last -- depends on hw flags! */
 866                 WLAN_CIPHER_SUITE_AES_CMAC
 867         };
 868
 869         /*
 870          * generic code guarantees at least one band,
 871          * set this very early because much code assumes
 872          * that hw.conf.channel is assigned
 873          */
 874         channels = 0;
 875         max_bitrates = 0;
 876         supp_ht = false;
 877         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 878                 struct ieee80211_supported_band *sband;
 879
 880                 sband = local->hw.wiphy->bands[band];
 881                 if (!sband)
 882                         continue;
 883                 if (!local->oper_channel) {
 884                         /* init channel we're on */
 885                         local->hw.conf.channel =
 886                         local->oper_channel =
 887                         local->scan_channel = &sband->channels[0];
 888                 }
 889                 channels += sband->n_channels;
 890
 891                 if (max_bitrates < sband->n_bitrates)
 892                         max_bitrates = sband->n_bitrates;
 893                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 894         }
 895
 896         local->int_scan_req.n_channels = channels;
 897         local->int_scan_req.channels = kzalloc(sizeof(void *) * channels, GFP_KERNEL);
 898         if (!local->int_scan_req.channels)
 899                 return -ENOMEM;
 900
 901         /* if low-level driver supports AP, we also support VLAN */
 902         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 903                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 904
 905         /* mac80211 always supports monitor */
 906         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 907
 908         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 909                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 910         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 911                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 912
 913         /*
 914          * Calculate scan IE length -- we need this to alloc
 915          * memory and to subtract from the driver limit. It
 916          * includes the (extended) supported rates and HT
 917          * information -- SSID is the driver's responsibility.
 918          */
 919         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 920         if (supp_ht)
 921                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 922
 923         if (!local->ops->hw_scan) {
 924                 /* For hw_scan, driver needs to set these up. */
 925                 local->hw.wiphy->max_scan_ssids = 4;
 926                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 927         }
 928
 929         /*
 930          * If the driver supports any scan IEs, then assume the
 931          * limit includes the IEs mac80211 will add, otherwise
 932          * leave it at zero and let the driver sort it out; we
 933          * still pass our IEs to the driver but userspace will
 934          * not be allowed to in that case.
 935          */
 936         if (local->hw.wiphy->max_scan_ie_len)
 937                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 938
 939         local->hw.wiphy->cipher_suites = cipher_suites;
 940         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 941         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 942                 local->hw.wiphy->n_cipher_suites--;
 943
 944         result = wiphy_register(local->hw.wiphy);
 945         if (result < 0)
 946                 goto fail_wiphy_register;
 947
 948         /*
 949          * We use the number of queues for feature tests (QoS, HT) internally
 950          * so restrict them appropriately.
 951          */
 952         if (hw->queues > IEEE80211_MAX_QUEUES)
 953                 hw->queues = IEEE80211_MAX_QUEUES;
 954
 955         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 956                                "wmaster%d", ieee80211_master_setup,
 957                                hw->queues);
 958         if (!mdev)
 959                 goto fail_mdev_alloc;
 960
 961         mpriv = netdev_priv(mdev);
 962         mpriv->local = local;
 963         local->mdev = mdev;
 964
 965         local->hw.workqueue =
 966                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 967         if (!local->hw.workqueue) {
 968                 result = -ENOMEM;
 969                 goto fail_workqueue;
 970         }
 971
 972         /*
 973          * The hardware needs headroom for sending the frame,
 974          * and we need some headroom for passing the frame to monitor
 975          * interfaces, but never both at the same time.
 976          */
 977         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 978                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 979
 980         debugfs_hw_add(local);
 981
 982         if (local->hw.max_listen_interval == 0)
 983                 local->hw.max_listen_interval = 1;
 984
 985         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 986
 987         result = sta_info_start(local);
 988         if (result < 0)
 989                 goto fail_sta_info;
 990
 991         result = ieee80211_wep_init(local);
 992         if (result < 0) {
 993                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 994                        wiphy_name(local->hw.wiphy), result);
 995                 goto fail_wep;
 996         }
 997
 998         rtnl_lock();
 999         result = dev_alloc_name(local->mdev, local->mdev->name);
1000         if (result < 0)
1001                 goto fail_dev;
1002
1003         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1004         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1005         local->mdev->features |= NETIF_F_NETNS_LOCAL;
1006
1007         result = register_netdevice(local->mdev);
1008         if (result < 0)
1009                 goto fail_dev;
1010
1011         result = ieee80211_init_rate_ctrl_alg(local,
1012                                               hw->rate_control_algorithm);
1013         if (result < 0) {
1014                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1015                        "algorithm\n", wiphy_name(local->hw.wiphy));
1016                 goto fail_rate;
1017         }
1018
1019         /* add one default STA interface if supported */
1020         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1021                 result = ieee80211_if_add(local, "wlan%d", NULL,
1022                                           NL80211_IFTYPE_STATION, NULL);
1023                 if (result)
1024                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1025                                wiphy_name(local->hw.wiphy));
1026         }
1027
1028         rtnl_unlock();
1029
1030         ieee80211_led_init(local);
1031
1032         /* alloc internal scan request */
1033         i = 0;
1034         local->int_scan_req.ssids = &local->scan_ssid;
1035         local->int_scan_req.n_ssids = 1;
1036         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1037                 if (!hw->wiphy->bands[band])
1038                         continue;
1039                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
1040                         local->int_scan_req.channels[i] =
1041                                 &hw->wiphy->bands[band]->channels[j];
1042                         i++;
1043                 }
1044         }
1045
1046         local->network_latency_notifier.notifier_call =
1047                 ieee80211_max_network_latency;
1048         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1049                                      &local->network_latency_notifier);
1050
1051         if (result) {
1052                 rtnl_lock();
1053                 goto fail_pm_qos;
1054         }
1055
1056         return 0;
1057
1058  fail_pm_qos:
1059         ieee80211_led_exit(local);
1060         ieee80211_remove_interfaces(local);
1061  fail_rate:
1062         unregister_netdevice(local->mdev);
1063         local->mdev = NULL;
1064  fail_dev:
1065         rtnl_unlock();
1066         ieee80211_wep_free(local);
1067  fail_wep:
1068         sta_info_stop(local);
1069  fail_sta_info:
1070         debugfs_hw_del(local);
1071         destroy_workqueue(local->hw.workqueue);
1072  fail_workqueue:
1073         if (local->mdev)
1074                 free_netdev(local->mdev);
1075  fail_mdev_alloc:
1076         wiphy_unregister(local->hw.wiphy);
1077  fail_wiphy_register:
1078         kfree(local->int_scan_req.channels);
1079         return result;
1080 }
1081 EXPORT_SYMBOL(ieee80211_register_hw);
1082
1083 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1084 {
1085         struct ieee80211_local *local = hw_to_local(hw);
1086
1087         tasklet_kill(&local->tx_pending_tasklet);
1088         tasklet_kill(&local->tasklet);
1089
1090         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1091                                &local->network_latency_notifier);
1092
1093         rtnl_lock();
1094
1095         /*
1096          * At this point, interface list manipulations are fine
1097          * because the driver cannot be handing us frames any
1098          * more and the tasklet is killed.
1099          */
1100
1101         /* First, we remove all virtual interfaces. */
1102         ieee80211_remove_interfaces(local);
1103
1104         /* then, finally, remove the master interface */
1105         unregister_netdevice(local->mdev);
1106
1107         rtnl_unlock();
1108
1109         ieee80211_clear_tx_pending(local);
1110         sta_info_stop(local);
1111         rate_control_deinitialize(local);
1112         debugfs_hw_del(local);
1113
1114         if (skb_queue_len(&local->skb_queue)
1115                         || skb_queue_len(&local->skb_queue_unreliable))
1116                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1117                        wiphy_name(local->hw.wiphy));
1118         skb_queue_purge(&local->skb_queue);
1119         skb_queue_purge(&local->skb_queue_unreliable);
1120
1121         destroy_workqueue(local->hw.workqueue);
1122         wiphy_unregister(local->hw.wiphy);
1123         ieee80211_wep_free(local);
1124         ieee80211_led_exit(local);
1125         free_netdev(local->mdev);
1126         kfree(local->int_scan_req.channels);
1127 }
1128 EXPORT_SYMBOL(ieee80211_unregister_hw);
1129
1130 void ieee80211_free_hw(struct ieee80211_hw *hw)
1131 {
1132         struct ieee80211_local *local = hw_to_local(hw);
1133
1134         mutex_destroy(&local->iflist_mtx);
1135         mutex_destroy(&local->scan_mtx);
1136
1137         wiphy_free(local->hw.wiphy);
1138 }
1139 EXPORT_SYMBOL(ieee80211_free_hw);
1140
1141 static int __init ieee80211_init(void)
1142 {
1143         struct sk_buff *skb;
1144         int ret;
1145
1146         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1147         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1148                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1149
1150         ret = rc80211_minstrel_init();
1151         if (ret)
1152                 return ret;
1153
1154         ret = rc80211_pid_init();
1155         if (ret)
1156                 return ret;
1157
1158         ieee80211_debugfs_netdev_init();
1159
1160         return 0;
1161 }
1162
1163 static void __exit ieee80211_exit(void)
1164 {
1165         rc80211_pid_exit();
1166         rc80211_minstrel_exit();
1167
1168         /*
1169          * For key todo, it'll be empty by now but the work
1170          * might still be scheduled.
1171          */
1172         flush_scheduled_work();
1173
1174         if (mesh_allocated)
1175                 ieee80211s_stop();
1176
1177         ieee80211_debugfs_netdev_exit();
1178 }
1179
1180
1181 subsys_initcall(ieee80211_init);
1182 module_exit(ieee80211_exit);
1183
1184 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1185 MODULE_LICENSE("GPL");