SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         u8 rate;
  45         u8 padding_for_rate;
  46         __le16 tx_flags;
  47         u8 data_retries;
  48 } __attribute__ ((packed));
  49
  50
  51 /* must be called under mdev tx lock */
  52 void ieee80211_configure_filter(struct ieee80211_local *local)
  53 {
  54         unsigned int changed_flags;
  55         unsigned int new_flags = 0;
  56
  57         if (atomic_read(&local->iff_promiscs))
  58                 new_flags |= FIF_PROMISC_IN_BSS;
  59
  60         if (atomic_read(&local->iff_allmultis))
  61                 new_flags |= FIF_ALLMULTI;
  62
  63         if (local->monitors)
  64                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  65
  66         if (local->fif_fcsfail)
  67                 new_flags |= FIF_FCSFAIL;
  68
  69         if (local->fif_plcpfail)
  70                 new_flags |= FIF_PLCPFAIL;
  71
  72         if (local->fif_control)
  73                 new_flags |= FIF_CONTROL;
  74
  75         if (local->fif_other_bss)
  76                 new_flags |= FIF_OTHER_BSS;
  77
  78         changed_flags = local->filter_flags ^ new_flags;
  79
  80         /* be a bit nasty */
  81         new_flags |= (1<<31);
  82
  83         local->ops->configure_filter(local_to_hw(local),
  84                                      changed_flags, &new_flags,
  85                                      local->mdev->mc_count,
  86                                      local->mdev->mc_list);
  87
  88         WARN_ON(new_flags & (1<<31));
  89
  90         local->filter_flags = new_flags & ~(1<<31);
  91 }
  92
  93 /* master interface */
  94
  95 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  96 {
  97         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  98         return ETH_ALEN;
  99 }
 100
 101 static const struct header_ops ieee80211_header_ops = {
 102         .create         = eth_header,
 103         .parse          = header_parse_80211,
 104         .rebuild        = eth_rebuild_header,
 105         .cache          = eth_header_cache,
 106         .cache_update   = eth_header_cache_update,
 107 };
 108
 109 static int ieee80211_master_open(struct net_device *dev)
 110 {
 111         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 112         struct ieee80211_local *local = mpriv->local;
 113         struct ieee80211_sub_if_data *sdata;
 114         int res = -EOPNOTSUPP;
 115
 116         /* we hold the RTNL here so can safely walk the list */
 117         list_for_each_entry(sdata, &local->interfaces, list) {
 118                 if (netif_running(sdata->dev)) {
 119                         res = 0;
 120                         break;
 121                 }
 122         }
 123
 124         if (res)
 125                 return res;
 126
 127         netif_tx_start_all_queues(local->mdev);
 128
 129         return 0;
 130 }
 131
 132 static int ieee80211_master_stop(struct net_device *dev)
 133 {
 134         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 135         struct ieee80211_local *local = mpriv->local;
 136         struct ieee80211_sub_if_data *sdata;
 137
 138         /* we hold the RTNL here so can safely walk the list */
 139         list_for_each_entry(sdata, &local->interfaces, list)
 140                 if (netif_running(sdata->dev))
 141                         dev_close(sdata->dev);
 142
 143         return 0;
 144 }
 145
 146 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 147 {
 148         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 149         struct ieee80211_local *local = mpriv->local;
 150
 151         ieee80211_configure_filter(local);
 152 }
 153
 154 /* everything else */
 155
 156 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 157 {
 158         struct ieee80211_local *local = sdata->local;
 159         struct ieee80211_if_conf conf;
 160
 161         if (WARN_ON(!netif_running(sdata->dev)))
 162                 return 0;
 163
 164         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 165                 return -EINVAL;
 166
 167         if (!local->ops->config_interface)
 168                 return 0;
 169
 170         memset(&conf, 0, sizeof(conf));
 171
 172         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 173             sdata->vif.type == NL80211_IFTYPE_ADHOC)
 174                 conf.bssid = sdata->u.sta.bssid;
 175         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 176                 conf.bssid = sdata->dev->dev_addr;
 177         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 178                 static const u8 zero[ETH_ALEN] = { 0 };
 179                 conf.bssid = zero;
 180         } else {
 181                 WARN_ON(1);
 182                 return -EINVAL;
 183         }
 184
 185         switch (sdata->vif.type) {
 186         case NL80211_IFTYPE_AP:
 187         case NL80211_IFTYPE_ADHOC:
 188         case NL80211_IFTYPE_MESH_POINT:
 189                 break;
 190         default:
 191                 /* do not warn to simplify caller in scan.c */
 192                 changed &= ~IEEE80211_IFCC_BEACON_ENABLED;
 193                 if (WARN_ON(changed & IEEE80211_IFCC_BEACON))
 194                         return -EINVAL;
 195                 changed &= ~IEEE80211_IFCC_BEACON;
 196                 break;
 197         }
 198
 199         if (changed & IEEE80211_IFCC_BEACON_ENABLED) {
 200                 if (local->sw_scanning) {
 201                         conf.enable_beacon = false;
 202                 } else {
 203                         /*
 204                          * Beacon should be enabled, but AP mode must
 205                          * check whether there is a beacon configured.
 206                          */
 207                         switch (sdata->vif.type) {
 208                         case NL80211_IFTYPE_AP:
 209                                 conf.enable_beacon =
 210                                         !!rcu_dereference(sdata->u.ap.beacon);
 211                                 break;
 212                         case NL80211_IFTYPE_ADHOC:
 213                         case NL80211_IFTYPE_MESH_POINT:
 214                                 conf.enable_beacon = true;
 215                                 break;
 216                         default:
 217                                 /* not reached */
 218                                 WARN_ON(1);
 219                                 break;
 220                         }
 221                 }
 222         }
 223
 224         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 225                 return -EINVAL;
 226
 227         conf.changed = changed;
 228
 229         return local->ops->config_interface(local_to_hw(local),
 230                                             &sdata->vif, &conf);
 231 }
 232
 233 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 234 {
 235         struct ieee80211_channel *chan;
 236         int ret = 0;
 237         int power;
 238         enum nl80211_channel_type channel_type;
 239
 240         might_sleep();
 241
 242         if (local->sw_scanning) {
 243                 chan = local->scan_channel;
 244                 channel_type = NL80211_CHAN_NO_HT;
 245         } else {
 246                 chan = local->oper_channel;
 247                 channel_type = local->oper_channel_type;
 248         }
 249
 250         if (chan != local->hw.conf.channel ||
 251             channel_type != local->hw.conf.channel_type) {
 252                 local->hw.conf.channel = chan;
 253                 local->hw.conf.channel_type = channel_type;
 254                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 255         }
 256
 257         if (local->sw_scanning)
 258                 power = chan->max_power;
 259         else
 260                 power = local->power_constr_level ?
 261                         (chan->max_power - local->power_constr_level) :
 262                         chan->max_power;
 263
 264         if (local->user_power_level)
 265                 power = min(power, local->user_power_level);
 266
 267         if (local->hw.conf.power_level != power) {
 268                 changed |= IEEE80211_CONF_CHANGE_POWER;
 269                 local->hw.conf.power_level = power;
 270         }
 271
 272         if (changed && local->open_count) {
 273                 ret = local->ops->config(local_to_hw(local), changed);
 274                 /*
 275                  * Goal:
 276                  * HW reconfiguration should never fail, the driver has told
 277                  * us what it can support so it should live up to that promise.
 278                  *
 279                  * Current status:
 280                  * rfkill is not integrated with mac80211 and a
 281                  * configuration command can thus fail if hardware rfkill
 282                  * is enabled
 283                  *
 284                  * FIXME: integrate rfkill with mac80211 and then add this
 285                  * WARN_ON() back
 286                  *
 287                  */
 288                 /* WARN_ON(ret); */
 289         }
 290
 291         return ret;
 292 }
 293
 294 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 295                                       u32 changed)
 296 {
 297         struct ieee80211_local *local = sdata->local;
 298
 299         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 300                 return;
 301
 302         if (!changed)
 303                 return;
 304
 305         if (local->ops->bss_info_changed)
 306                 local->ops->bss_info_changed(local_to_hw(local),
 307                                              &sdata->vif,
 308                                              &sdata->vif.bss_conf,
 309                                              changed);
 310 }
 311
 312 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 313 {
 314         sdata->vif.bss_conf.use_cts_prot = false;
 315         sdata->vif.bss_conf.use_short_preamble = false;
 316         sdata->vif.bss_conf.use_short_slot = false;
 317         return BSS_CHANGED_ERP_CTS_PROT |
 318                BSS_CHANGED_ERP_PREAMBLE |
 319                BSS_CHANGED_ERP_SLOT;
 320 }
 321
 322 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 323                                  struct sk_buff *skb)
 324 {
 325         struct ieee80211_local *local = hw_to_local(hw);
 326         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 327         int tmp;
 328
 329         skb->dev = local->mdev;
 330         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 331         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 332                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 333         tmp = skb_queue_len(&local->skb_queue) +
 334                 skb_queue_len(&local->skb_queue_unreliable);
 335         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 336                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 337                 dev_kfree_skb_irq(skb);
 338                 tmp--;
 339                 I802_DEBUG_INC(local->tx_status_drop);
 340         }
 341         tasklet_schedule(&local->tasklet);
 342 }
 343 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 344
 345 static void ieee80211_tasklet_handler(unsigned long data)
 346 {
 347         struct ieee80211_local *local = (struct ieee80211_local *) data;
 348         struct sk_buff *skb;
 349         struct ieee80211_rx_status rx_status;
 350         struct ieee80211_ra_tid *ra_tid;
 351
 352         while ((skb = skb_dequeue(&local->skb_queue)) ||
 353                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 354                 switch (skb->pkt_type) {
 355                 case IEEE80211_RX_MSG:
 356                         /* status is in skb->cb */
 357                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 358                         /* Clear skb->pkt_type in order to not confuse kernel
 359                          * netstack. */
 360                         skb->pkt_type = 0;
 361                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 362                         break;
 363                 case IEEE80211_TX_STATUS_MSG:
 364                         skb->pkt_type = 0;
 365                         ieee80211_tx_status(local_to_hw(local), skb);
 366                         break;
 367                 case IEEE80211_DELBA_MSG:
 368                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 369                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 370                                                 ra_tid->ra, ra_tid->tid);
 371                         dev_kfree_skb(skb);
 372                         break;
 373                 case IEEE80211_ADDBA_MSG:
 374                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 375                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 376                                                  ra_tid->ra, ra_tid->tid);
 377                         dev_kfree_skb(skb);
 378                         break ;
 379                 default:
 380                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 381                              skb->pkt_type);
 382                         dev_kfree_skb(skb);
 383                         break;
 384                 }
 385         }
 386 }
 387
 388 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 389  * make a prepared TX frame (one that has been given to hw) to look like brand
 390  * new IEEE 802.11 frame that is ready to go through TX processing again.
 391  */
 392 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 393                                       struct ieee80211_key *key,
 394                                       struct sk_buff *skb)
 395 {
 396         unsigned int hdrlen, iv_len, mic_len;
 397         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 398
 399         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 400
 401         if (!key)
 402                 goto no_key;
 403
 404         switch (key->conf.alg) {
 405         case ALG_WEP:
 406                 iv_len = WEP_IV_LEN;
 407                 mic_len = WEP_ICV_LEN;
 408                 break;
 409         case ALG_TKIP:
 410                 iv_len = TKIP_IV_LEN;
 411                 mic_len = TKIP_ICV_LEN;
 412                 break;
 413         case ALG_CCMP:
 414                 iv_len = CCMP_HDR_LEN;
 415                 mic_len = CCMP_MIC_LEN;
 416                 break;
 417         default:
 418                 goto no_key;
 419         }
 420
 421         if (skb->len >= hdrlen + mic_len &&
 422             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 423                 skb_trim(skb, skb->len - mic_len);
 424         if (skb->len >= hdrlen + iv_len) {
 425                 memmove(skb->data + iv_len, skb->data, hdrlen);
 426                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 427         }
 428
 429 no_key:
 430         if (ieee80211_is_data_qos(hdr->frame_control)) {
 431                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 432                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 433                         hdrlen - IEEE80211_QOS_CTL_LEN);
 434                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 435         }
 436 }
 437
 438 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 439                                             struct sta_info *sta,
 440                                             struct sk_buff *skb)
 441 {
 442         sta->tx_filtered_count++;
 443
 444         /*
 445          * Clear the TX filter mask for this STA when sending the next
 446          * packet. If the STA went to power save mode, this will happen
 447          * when it wakes up for the next time.
 448          */
 449         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 450
 451         /*
 452          * This code races in the following way:
 453          *
 454          *  (1) STA sends frame indicating it will go to sleep and does so
 455          *  (2) hardware/firmware adds STA to filter list, passes frame up
 456          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 457          *  (4) we get TX status before having processed the frame and
 458          *      knowing that the STA has gone to sleep.
 459          *
 460          * This is actually quite unlikely even when both those events are
 461          * processed from interrupts coming in quickly after one another or
 462          * even at the same time because we queue both TX status events and
 463          * RX frames to be processed by a tasklet and process them in the
 464          * same order that they were received or TX status last. Hence, there
 465          * is no race as long as the frame RX is processed before the next TX
 466          * status, which drivers can ensure, see below.
 467          *
 468          * Note that this can only happen if the hardware or firmware can
 469          * actually add STAs to the filter list, if this is done by the
 470          * driver in response to set_tim() (which will only reduce the race
 471          * this whole filtering tries to solve, not completely solve it)
 472          * this situation cannot happen.
 473          *
 474          * To completely solve this race drivers need to make sure that they
 475          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 476          *      functions and
 477          *  (b) always process RX events before TX status events if ordering
 478          *      can be unknown, for example with different interrupt status
 479          *      bits.
 480          */
 481         if (test_sta_flags(sta, WLAN_STA_PS) &&
 482             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 483                 ieee80211_remove_tx_extra(local, sta->key, skb);
 484                 skb_queue_tail(&sta->tx_filtered, skb);
 485                 return;
 486         }
 487
 488         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 489                 /* Software retry the packet once */
 490                 skb->requeue = 1;
 491                 ieee80211_remove_tx_extra(local, sta->key, skb);
 492                 dev_queue_xmit(skb);
 493                 return;
 494         }
 495
 496 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 497         if (net_ratelimit())
 498                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 499                        "queue_len=%d PS=%d @%lu\n",
 500                        wiphy_name(local->hw.wiphy),
 501                        skb_queue_len(&sta->tx_filtered),
 502                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 503 #endif
 504         dev_kfree_skb(skb);
 505 }
 506
 507 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 508 {
 509         struct sk_buff *skb2;
 510         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 511         struct ieee80211_local *local = hw_to_local(hw);
 512         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 513         u16 frag, type;
 514         __le16 fc;
 515         struct ieee80211_supported_band *sband;
 516         struct ieee80211_tx_status_rtap_hdr *rthdr;
 517         struct ieee80211_sub_if_data *sdata;
 518         struct net_device *prev_dev = NULL;
 519         struct sta_info *sta;
 520         int retry_count = -1, i;
 521
 522         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 523                 /* the HW cannot have attempted that rate */
 524                 if (i >= hw->max_rates) {
 525                         info->status.rates[i].idx = -1;
 526                         info->status.rates[i].count = 0;
 527                 }
 528
 529                 retry_count += info->status.rates[i].count;
 530         }
 531         if (retry_count < 0)
 532                 retry_count = 0;
 533
 534         rcu_read_lock();
 535
 536         sband = local->hw.wiphy->bands[info->band];
 537
 538         sta = sta_info_get(local, hdr->addr1);
 539
 540         if (sta) {
 541                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 542                     test_sta_flags(sta, WLAN_STA_PS)) {
 543                         /*
 544                          * The STA is in power save mode, so assume
 545                          * that this TX packet failed because of that.
 546                          */
 547                         ieee80211_handle_filtered_frame(local, sta, skb);
 548                         rcu_read_unlock();
 549                         return;
 550                 }
 551
 552                 fc = hdr->frame_control;
 553
 554                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 555                     (ieee80211_is_data_qos(fc))) {
 556                         u16 tid, ssn;
 557                         u8 *qc;
 558
 559                         qc = ieee80211_get_qos_ctl(hdr);
 560                         tid = qc[0] & 0xf;
 561                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 562                                                 & IEEE80211_SCTL_SEQ);
 563                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 564                                            tid, ssn);
 565                 }
 566
 567                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 568                         ieee80211_handle_filtered_frame(local, sta, skb);
 569                         rcu_read_unlock();
 570                         return;
 571                 } else {
 572                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 573                                 sta->tx_retry_failed++;
 574                         sta->tx_retry_count += retry_count;
 575                 }
 576
 577                 rate_control_tx_status(local, sband, sta, skb);
 578         }
 579
 580         rcu_read_unlock();
 581
 582         ieee80211_led_tx(local, 0);
 583
 584         /* SNMP counters
 585          * Fragments are passed to low-level drivers as separate skbs, so these
 586          * are actually fragments, not frames. Update frame counters only for
 587          * the first fragment of the frame. */
 588
 589         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 590         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 591
 592         if (info->flags & IEEE80211_TX_STAT_ACK) {
 593                 if (frag == 0) {
 594                         local->dot11TransmittedFrameCount++;
 595                         if (is_multicast_ether_addr(hdr->addr1))
 596                                 local->dot11MulticastTransmittedFrameCount++;
 597                         if (retry_count > 0)
 598                                 local->dot11RetryCount++;
 599                         if (retry_count > 1)
 600                                 local->dot11MultipleRetryCount++;
 601                 }
 602
 603                 /* This counter shall be incremented for an acknowledged MPDU
 604                  * with an individual address in the address 1 field or an MPDU
 605                  * with a multicast address in the address 1 field of type Data
 606                  * or Management. */
 607                 if (!is_multicast_ether_addr(hdr->addr1) ||
 608                     type == IEEE80211_FTYPE_DATA ||
 609                     type == IEEE80211_FTYPE_MGMT)
 610                         local->dot11TransmittedFragmentCount++;
 611         } else {
 612                 if (frag == 0)
 613                         local->dot11FailedCount++;
 614         }
 615
 616         /* this was a transmitted frame, but now we want to reuse it */
 617         skb_orphan(skb);
 618
 619         /*
 620          * This is a bit racy but we can avoid a lot of work
 621          * with this test...
 622          */
 623         if (!local->monitors && !local->cooked_mntrs) {
 624                 dev_kfree_skb(skb);
 625                 return;
 626         }
 627
 628         /* send frame to monitor interfaces now */
 629
 630         if (skb_headroom(skb) < sizeof(*rthdr)) {
 631                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 632                 dev_kfree_skb(skb);
 633                 return;
 634         }
 635
 636         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 637                                 skb_push(skb, sizeof(*rthdr));
 638
 639         memset(rthdr, 0, sizeof(*rthdr));
 640         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 641         rthdr->hdr.it_present =
 642                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 643                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 644                             (1 << IEEE80211_RADIOTAP_RATE));
 645
 646         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 647             !is_multicast_ether_addr(hdr->addr1))
 648                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 649
 650         /*
 651          * XXX: Once radiotap gets the bitmap reset thing the vendor
 652          *      extensions proposal contains, we can actually report
 653          *      the whole set of tries we did.
 654          */
 655         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 656             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 657                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 658         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 659                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 660         if (info->status.rates[0].idx >= 0 &&
 661             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 662                 rthdr->rate = sband->bitrates[
 663                                 info->status.rates[0].idx].bitrate / 5;
 664
 665         /* for now report the total retry_count */
 666         rthdr->data_retries = retry_count;
 667
 668         /* XXX: is this sufficient for BPF? */
 669         skb_set_mac_header(skb, 0);
 670         skb->ip_summed = CHECKSUM_UNNECESSARY;
 671         skb->pkt_type = PACKET_OTHERHOST;
 672         skb->protocol = htons(ETH_P_802_2);
 673         memset(skb->cb, 0, sizeof(skb->cb));
 674
 675         rcu_read_lock();
 676         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 677                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 678                         if (!netif_running(sdata->dev))
 679                                 continue;
 680
 681                         if (prev_dev) {
 682                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 683                                 if (skb2) {
 684                                         skb2->dev = prev_dev;
 685                                         netif_rx(skb2);
 686                                 }
 687                         }
 688
 689                         prev_dev = sdata->dev;
 690                 }
 691         }
 692         if (prev_dev) {
 693                 skb->dev = prev_dev;
 694                 netif_rx(skb);
 695                 skb = NULL;
 696         }
 697         rcu_read_unlock();
 698         dev_kfree_skb(skb);
 699 }
 700 EXPORT_SYMBOL(ieee80211_tx_status);
 701
 702 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 703                                         const struct ieee80211_ops *ops)
 704 {
 705         struct ieee80211_local *local;
 706         int priv_size;
 707         struct wiphy *wiphy;
 708
 709         /* Ensure 32-byte alignment of our private data and hw private data.
 710          * We use the wiphy priv data for both our ieee80211_local and for
 711          * the driver's private data
 712          *
 713          * In memory it'll be like this:
 714          *
 715          * +-------------------------+
 716          * | struct wiphy           |
 717          * +-------------------------+
 718          * | struct ieee80211_local  |
 719          * +-------------------------+
 720          * | driver's private data   |
 721          * +-------------------------+
 722          *
 723          */
 724         priv_size = ((sizeof(struct ieee80211_local) +
 725                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 726                     priv_data_len;
 727
 728         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 729
 730         if (!wiphy)
 731                 return NULL;
 732
 733         wiphy->privid = mac80211_wiphy_privid;
 734
 735         local = wiphy_priv(wiphy);
 736         local->hw.wiphy = wiphy;
 737
 738         local->hw.priv = (char *)local +
 739                          ((sizeof(struct ieee80211_local) +
 740                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 741
 742         BUG_ON(!ops->tx);
 743         BUG_ON(!ops->start);
 744         BUG_ON(!ops->stop);
 745         BUG_ON(!ops->config);
 746         BUG_ON(!ops->add_interface);
 747         BUG_ON(!ops->remove_interface);
 748         BUG_ON(!ops->configure_filter);
 749         local->ops = ops;
 750
 751         /* set up some defaults */
 752         local->hw.queues = 1;
 753         local->hw.max_rates = 1;
 754         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 755         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 756         local->hw.conf.long_frame_max_tx_count = 4;
 757         local->hw.conf.short_frame_max_tx_count = 7;
 758         local->hw.conf.radio_enabled = true;
 759
 760         INIT_LIST_HEAD(&local->interfaces);
 761         mutex_init(&local->iflist_mtx);
 762
 763         spin_lock_init(&local->key_lock);
 764
 765         spin_lock_init(&local->queue_stop_reason_lock);
 766
 767         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 768
 769         INIT_WORK(&local->dynamic_ps_enable_work,
 770                   ieee80211_dynamic_ps_enable_work);
 771         INIT_WORK(&local->dynamic_ps_disable_work,
 772                   ieee80211_dynamic_ps_disable_work);
 773         setup_timer(&local->dynamic_ps_timer,
 774                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 775
 776         sta_info_init(local);
 777
 778         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 779                      (unsigned long)local);
 780         tasklet_disable(&local->tx_pending_tasklet);
 781
 782         tasklet_init(&local->tasklet,
 783                      ieee80211_tasklet_handler,
 784                      (unsigned long) local);
 785         tasklet_disable(&local->tasklet);
 786
 787         skb_queue_head_init(&local->skb_queue);
 788         skb_queue_head_init(&local->skb_queue_unreliable);
 789
 790         return local_to_hw(local);
 791 }
 792 EXPORT_SYMBOL(ieee80211_alloc_hw);
 793
 794 int ieee80211_register_hw(struct ieee80211_hw *hw)
 795 {
 796         struct ieee80211_local *local = hw_to_local(hw);
 797         int result;
 798         enum ieee80211_band band;
 799         struct net_device *mdev;
 800         struct ieee80211_master_priv *mpriv;
 801
 802         /*
 803          * generic code guarantees at least one band,
 804          * set this very early because much code assumes
 805          * that hw.conf.channel is assigned
 806          */
 807         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 808                 struct ieee80211_supported_band *sband;
 809
 810                 sband = local->hw.wiphy->bands[band];
 811                 if (sband) {
 812                         /* init channel we're on */
 813                         local->hw.conf.channel =
 814                         local->oper_channel =
 815                         local->scan_channel = &sband->channels[0];
 816                         break;
 817                 }
 818         }
 819
 820         /* if low-level driver supports AP, we also support VLAN */
 821         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 822                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 823
 824         /* mac80211 always supports monitor */
 825         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 826
 827         result = wiphy_register(local->hw.wiphy);
 828         if (result < 0)
 829                 return result;
 830
 831         /*
 832          * We use the number of queues for feature tests (QoS, HT) internally
 833          * so restrict them appropriately.
 834          */
 835         if (hw->queues > IEEE80211_MAX_QUEUES)
 836                 hw->queues = IEEE80211_MAX_QUEUES;
 837         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 838                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 839         if (hw->queues < 4)
 840                 hw->ampdu_queues = 0;
 841
 842         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 843                                "wmaster%d", ether_setup,
 844                                ieee80211_num_queues(hw));
 845         if (!mdev)
 846                 goto fail_mdev_alloc;
 847
 848         mpriv = netdev_priv(mdev);
 849         mpriv->local = local;
 850         local->mdev = mdev;
 851
 852         ieee80211_rx_bss_list_init(local);
 853
 854         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 855         mdev->open = ieee80211_master_open;
 856         mdev->stop = ieee80211_master_stop;
 857         mdev->type = ARPHRD_IEEE80211;
 858         mdev->header_ops = &ieee80211_header_ops;
 859         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 860
 861         local->hw.workqueue =
 862                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 863         if (!local->hw.workqueue) {
 864                 result = -ENOMEM;
 865                 goto fail_workqueue;
 866         }
 867
 868         /*
 869          * The hardware needs headroom for sending the frame,
 870          * and we need some headroom for passing the frame to monitor
 871          * interfaces, but never both at the same time.
 872          */
 873         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 874                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 875
 876         debugfs_hw_add(local);
 877
 878         if (local->hw.conf.beacon_int < 10)
 879                 local->hw.conf.beacon_int = 100;
 880
 881         if (local->hw.max_listen_interval == 0)
 882                 local->hw.max_listen_interval = 1;
 883
 884         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 885
 886         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 887                                                   IEEE80211_HW_SIGNAL_DBM) ?
 888                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 889         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 890                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 891         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 892                 local->wstats_flags |= IW_QUAL_DBM;
 893
 894         result = sta_info_start(local);
 895         if (result < 0)
 896                 goto fail_sta_info;
 897
 898         rtnl_lock();
 899         result = dev_alloc_name(local->mdev, local->mdev->name);
 900         if (result < 0)
 901                 goto fail_dev;
 902
 903         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 904         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 905
 906         result = register_netdevice(local->mdev);
 907         if (result < 0)
 908                 goto fail_dev;
 909
 910         result = ieee80211_init_rate_ctrl_alg(local,
 911                                               hw->rate_control_algorithm);
 912         if (result < 0) {
 913                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 914                        "algorithm\n", wiphy_name(local->hw.wiphy));
 915                 goto fail_rate;
 916         }
 917
 918         result = ieee80211_wep_init(local);
 919
 920         if (result < 0) {
 921                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 922                        wiphy_name(local->hw.wiphy), result);
 923                 goto fail_wep;
 924         }
 925
 926         local->mdev->select_queue = ieee80211_select_queue;
 927
 928         /* add one default STA interface if supported */
 929         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 930                 result = ieee80211_if_add(local, "wlan%d", NULL,
 931                                           NL80211_IFTYPE_STATION, NULL);
 932                 if (result)
 933                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 934                                wiphy_name(local->hw.wiphy));
 935         }
 936
 937         rtnl_unlock();
 938
 939         ieee80211_led_init(local);
 940
 941         return 0;
 942
 943 fail_wep:
 944         rate_control_deinitialize(local);
 945 fail_rate:
 946         unregister_netdevice(local->mdev);
 947         local->mdev = NULL;
 948 fail_dev:
 949         rtnl_unlock();
 950         sta_info_stop(local);
 951 fail_sta_info:
 952         debugfs_hw_del(local);
 953         destroy_workqueue(local->hw.workqueue);
 954 fail_workqueue:
 955         if (local->mdev)
 956                 free_netdev(local->mdev);
 957 fail_mdev_alloc:
 958         wiphy_unregister(local->hw.wiphy);
 959         return result;
 960 }
 961 EXPORT_SYMBOL(ieee80211_register_hw);
 962
 963 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 964 {
 965         struct ieee80211_local *local = hw_to_local(hw);
 966
 967         tasklet_kill(&local->tx_pending_tasklet);
 968         tasklet_kill(&local->tasklet);
 969
 970         rtnl_lock();
 971
 972         /*
 973          * At this point, interface list manipulations are fine
 974          * because the driver cannot be handing us frames any
 975          * more and the tasklet is killed.
 976          */
 977
 978         /* First, we remove all virtual interfaces. */
 979         ieee80211_remove_interfaces(local);
 980
 981         /* then, finally, remove the master interface */
 982         unregister_netdevice(local->mdev);
 983
 984         rtnl_unlock();
 985
 986         ieee80211_rx_bss_list_deinit(local);
 987         ieee80211_clear_tx_pending(local);
 988         sta_info_stop(local);
 989         rate_control_deinitialize(local);
 990         debugfs_hw_del(local);
 991
 992         if (skb_queue_len(&local->skb_queue)
 993                         || skb_queue_len(&local->skb_queue_unreliable))
 994                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 995                        wiphy_name(local->hw.wiphy));
 996         skb_queue_purge(&local->skb_queue);
 997         skb_queue_purge(&local->skb_queue_unreliable);
 998
 999         destroy_workqueue(local->hw.workqueue);
1000         wiphy_unregister(local->hw.wiphy);
1001         ieee80211_wep_free(local);
1002         ieee80211_led_exit(local);
1003         free_netdev(local->mdev);
1004 }
1005 EXPORT_SYMBOL(ieee80211_unregister_hw);
1006
1007 void ieee80211_free_hw(struct ieee80211_hw *hw)
1008 {
1009         struct ieee80211_local *local = hw_to_local(hw);
1010
1011         mutex_destroy(&local->iflist_mtx);
1012
1013         wiphy_free(local->hw.wiphy);
1014 }
1015 EXPORT_SYMBOL(ieee80211_free_hw);
1016
1017 static int __init ieee80211_init(void)
1018 {
1019         struct sk_buff *skb;
1020         int ret;
1021
1022         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1023         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1024                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1025
1026         ret = rc80211_minstrel_init();
1027         if (ret)
1028                 return ret;
1029
1030         ret = rc80211_pid_init();
1031         if (ret)
1032                 return ret;
1033
1034         ieee80211_debugfs_netdev_init();
1035
1036         return 0;
1037 }
1038
1039 static void __exit ieee80211_exit(void)
1040 {
1041         rc80211_pid_exit();
1042         rc80211_minstrel_exit();
1043
1044         /*
1045          * For key todo, it'll be empty by now but the work
1046          * might still be scheduled.
1047          */
1048         flush_scheduled_work();
1049
1050         if (mesh_allocated)
1051                 ieee80211s_stop();
1052
1053         ieee80211_debugfs_netdev_exit();
1054 }
1055
1056
1057 subsys_initcall(ieee80211_init);
1058 module_exit(ieee80211_exit);
1059
1060 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1061 MODULE_LICENSE("GPL");