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         conf.changed = changed;
 172
 173         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 174             sdata->vif.type == NL80211_IFTYPE_ADHOC)
 175                 conf.bssid = sdata->u.sta.bssid;
 176         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 177                 conf.bssid = sdata->dev->dev_addr;
 178         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 179                 u8 zero[ETH_ALEN] = { 0 };
 180                 conf.bssid = zero;
 181         } else {
 182                 WARN_ON(1);
 183                 return -EINVAL;
 184         }
 185
 186         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 187                 return -EINVAL;
 188
 189         return local->ops->config_interface(local_to_hw(local),
 190                                             &sdata->vif, &conf);
 191 }
 192
 193 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 194 {
 195         struct ieee80211_channel *chan;
 196         int ret = 0;
 197         int power;
 198
 199         might_sleep();
 200
 201         if (local->sw_scanning)
 202                 chan = local->scan_channel;
 203         else
 204                 chan = local->oper_channel;
 205
 206         if (chan != local->hw.conf.channel) {
 207                 local->hw.conf.channel = chan;
 208                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 209         }
 210
 211
 212         if (!local->hw.conf.power_level)
 213                 power = chan->max_power;
 214         else
 215                 power = min(chan->max_power, local->hw.conf.power_level);
 216         if (local->hw.conf.power_level != power) {
 217                 changed |= IEEE80211_CONF_CHANGE_POWER;
 218                 local->hw.conf.power_level = power;
 219         }
 220
 221         if (changed && local->open_count) {
 222                 ret = local->ops->config(local_to_hw(local), changed);
 223                 /*
 224                  * HW reconfiguration should never fail, the driver has told
 225                  * us what it can support so it should live up to that promise.
 226                  */
 227                 WARN_ON(ret);
 228         }
 229
 230         return ret;
 231 }
 232
 233 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 234                                       u32 changed)
 235 {
 236         struct ieee80211_local *local = sdata->local;
 237
 238         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 239                 return;
 240
 241         if (!changed)
 242                 return;
 243
 244         if (local->ops->bss_info_changed)
 245                 local->ops->bss_info_changed(local_to_hw(local),
 246                                              &sdata->vif,
 247                                              &sdata->vif.bss_conf,
 248                                              changed);
 249 }
 250
 251 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 252 {
 253         sdata->vif.bss_conf.use_cts_prot = false;
 254         sdata->vif.bss_conf.use_short_preamble = false;
 255         sdata->vif.bss_conf.use_short_slot = false;
 256         return BSS_CHANGED_ERP_CTS_PROT |
 257                BSS_CHANGED_ERP_PREAMBLE |
 258                BSS_CHANGED_ERP_SLOT;
 259 }
 260
 261 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 262                                  struct sk_buff *skb)
 263 {
 264         struct ieee80211_local *local = hw_to_local(hw);
 265         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 266         int tmp;
 267
 268         skb->dev = local->mdev;
 269         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 270         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 271                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 272         tmp = skb_queue_len(&local->skb_queue) +
 273                 skb_queue_len(&local->skb_queue_unreliable);
 274         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 275                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 276                 dev_kfree_skb_irq(skb);
 277                 tmp--;
 278                 I802_DEBUG_INC(local->tx_status_drop);
 279         }
 280         tasklet_schedule(&local->tasklet);
 281 }
 282 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 283
 284 static void ieee80211_tasklet_handler(unsigned long data)
 285 {
 286         struct ieee80211_local *local = (struct ieee80211_local *) data;
 287         struct sk_buff *skb;
 288         struct ieee80211_rx_status rx_status;
 289         struct ieee80211_ra_tid *ra_tid;
 290
 291         while ((skb = skb_dequeue(&local->skb_queue)) ||
 292                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 293                 switch (skb->pkt_type) {
 294                 case IEEE80211_RX_MSG:
 295                         /* status is in skb->cb */
 296                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 297                         /* Clear skb->pkt_type in order to not confuse kernel
 298                          * netstack. */
 299                         skb->pkt_type = 0;
 300                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 301                         break;
 302                 case IEEE80211_TX_STATUS_MSG:
 303                         skb->pkt_type = 0;
 304                         ieee80211_tx_status(local_to_hw(local), skb);
 305                         break;
 306                 case IEEE80211_DELBA_MSG:
 307                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 308                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 309                                                 ra_tid->ra, ra_tid->tid);
 310                         dev_kfree_skb(skb);
 311                         break;
 312                 case IEEE80211_ADDBA_MSG:
 313                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 314                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 315                                                  ra_tid->ra, ra_tid->tid);
 316                         dev_kfree_skb(skb);
 317                         break ;
 318                 default:
 319                         WARN_ON(1);
 320                         dev_kfree_skb(skb);
 321                         break;
 322                 }
 323         }
 324 }
 325
 326 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 327  * make a prepared TX frame (one that has been given to hw) to look like brand
 328  * new IEEE 802.11 frame that is ready to go through TX processing again.
 329  */
 330 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 331                                       struct ieee80211_key *key,
 332                                       struct sk_buff *skb)
 333 {
 334         unsigned int hdrlen, iv_len, mic_len;
 335         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 336
 337         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 338
 339         if (!key)
 340                 goto no_key;
 341
 342         switch (key->conf.alg) {
 343         case ALG_WEP:
 344                 iv_len = WEP_IV_LEN;
 345                 mic_len = WEP_ICV_LEN;
 346                 break;
 347         case ALG_TKIP:
 348                 iv_len = TKIP_IV_LEN;
 349                 mic_len = TKIP_ICV_LEN;
 350                 break;
 351         case ALG_CCMP:
 352                 iv_len = CCMP_HDR_LEN;
 353                 mic_len = CCMP_MIC_LEN;
 354                 break;
 355         default:
 356                 goto no_key;
 357         }
 358
 359         if (skb->len >= hdrlen + mic_len &&
 360             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 361                 skb_trim(skb, skb->len - mic_len);
 362         if (skb->len >= hdrlen + iv_len) {
 363                 memmove(skb->data + iv_len, skb->data, hdrlen);
 364                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 365         }
 366
 367 no_key:
 368         if (ieee80211_is_data_qos(hdr->frame_control)) {
 369                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 370                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 371                         hdrlen - IEEE80211_QOS_CTL_LEN);
 372                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 373         }
 374 }
 375
 376 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 377                                             struct sta_info *sta,
 378                                             struct sk_buff *skb)
 379 {
 380         sta->tx_filtered_count++;
 381
 382         /*
 383          * Clear the TX filter mask for this STA when sending the next
 384          * packet. If the STA went to power save mode, this will happen
 385          * when it wakes up for the next time.
 386          */
 387         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 388
 389         /*
 390          * This code races in the following way:
 391          *
 392          *  (1) STA sends frame indicating it will go to sleep and does so
 393          *  (2) hardware/firmware adds STA to filter list, passes frame up
 394          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 395          *  (4) we get TX status before having processed the frame and
 396          *      knowing that the STA has gone to sleep.
 397          *
 398          * This is actually quite unlikely even when both those events are
 399          * processed from interrupts coming in quickly after one another or
 400          * even at the same time because we queue both TX status events and
 401          * RX frames to be processed by a tasklet and process them in the
 402          * same order that they were received or TX status last. Hence, there
 403          * is no race as long as the frame RX is processed before the next TX
 404          * status, which drivers can ensure, see below.
 405          *
 406          * Note that this can only happen if the hardware or firmware can
 407          * actually add STAs to the filter list, if this is done by the
 408          * driver in response to set_tim() (which will only reduce the race
 409          * this whole filtering tries to solve, not completely solve it)
 410          * this situation cannot happen.
 411          *
 412          * To completely solve this race drivers need to make sure that they
 413          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 414          *      functions and
 415          *  (b) always process RX events before TX status events if ordering
 416          *      can be unknown, for example with different interrupt status
 417          *      bits.
 418          */
 419         if (test_sta_flags(sta, WLAN_STA_PS) &&
 420             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 421                 ieee80211_remove_tx_extra(local, sta->key, skb);
 422                 skb_queue_tail(&sta->tx_filtered, skb);
 423                 return;
 424         }
 425
 426         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 427                 /* Software retry the packet once */
 428                 skb->requeue = 1;
 429                 ieee80211_remove_tx_extra(local, sta->key, skb);
 430                 dev_queue_xmit(skb);
 431                 return;
 432         }
 433
 434 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 435         if (net_ratelimit())
 436                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 437                        "queue_len=%d PS=%d @%lu\n",
 438                        wiphy_name(local->hw.wiphy),
 439                        skb_queue_len(&sta->tx_filtered),
 440                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 441 #endif
 442         dev_kfree_skb(skb);
 443 }
 444
 445 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 446 {
 447         struct sk_buff *skb2;
 448         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 449         struct ieee80211_local *local = hw_to_local(hw);
 450         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 451         u16 frag, type;
 452         __le16 fc;
 453         struct ieee80211_supported_band *sband;
 454         struct ieee80211_tx_status_rtap_hdr *rthdr;
 455         struct ieee80211_sub_if_data *sdata;
 456         struct net_device *prev_dev = NULL;
 457         struct sta_info *sta;
 458         int retry_count = -1, i;
 459
 460         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 461                 /* the HW cannot have attempted that rate */
 462                 if (i >= hw->max_rates) {
 463                         info->status.rates[i].idx = -1;
 464                         info->status.rates[i].count = 0;
 465                 }
 466
 467                 retry_count += info->status.rates[i].count;
 468         }
 469         if (retry_count < 0)
 470                 retry_count = 0;
 471
 472         rcu_read_lock();
 473
 474         sband = local->hw.wiphy->bands[info->band];
 475
 476         sta = sta_info_get(local, hdr->addr1);
 477
 478         if (sta) {
 479                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 480                     test_sta_flags(sta, WLAN_STA_PS)) {
 481                         /*
 482                          * The STA is in power save mode, so assume
 483                          * that this TX packet failed because of that.
 484                          */
 485                         ieee80211_handle_filtered_frame(local, sta, skb);
 486                         rcu_read_unlock();
 487                         return;
 488                 }
 489
 490                 fc = hdr->frame_control;
 491
 492                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 493                     (ieee80211_is_data_qos(fc))) {
 494                         u16 tid, ssn;
 495                         u8 *qc;
 496
 497                         qc = ieee80211_get_qos_ctl(hdr);
 498                         tid = qc[0] & 0xf;
 499                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 500                                                 & IEEE80211_SCTL_SEQ);
 501                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 502                                            tid, ssn);
 503                 }
 504
 505                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 506                         ieee80211_handle_filtered_frame(local, sta, skb);
 507                         rcu_read_unlock();
 508                         return;
 509                 } else {
 510                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 511                                 sta->tx_retry_failed++;
 512                         sta->tx_retry_count += retry_count;
 513                 }
 514
 515                 rate_control_tx_status(local, sband, sta, skb);
 516         }
 517
 518         rcu_read_unlock();
 519
 520         ieee80211_led_tx(local, 0);
 521
 522         /* SNMP counters
 523          * Fragments are passed to low-level drivers as separate skbs, so these
 524          * are actually fragments, not frames. Update frame counters only for
 525          * the first fragment of the frame. */
 526
 527         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 528         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 529
 530         if (info->flags & IEEE80211_TX_STAT_ACK) {
 531                 if (frag == 0) {
 532                         local->dot11TransmittedFrameCount++;
 533                         if (is_multicast_ether_addr(hdr->addr1))
 534                                 local->dot11MulticastTransmittedFrameCount++;
 535                         if (retry_count > 0)
 536                                 local->dot11RetryCount++;
 537                         if (retry_count > 1)
 538                                 local->dot11MultipleRetryCount++;
 539                 }
 540
 541                 /* This counter shall be incremented for an acknowledged MPDU
 542                  * with an individual address in the address 1 field or an MPDU
 543                  * with a multicast address in the address 1 field of type Data
 544                  * or Management. */
 545                 if (!is_multicast_ether_addr(hdr->addr1) ||
 546                     type == IEEE80211_FTYPE_DATA ||
 547                     type == IEEE80211_FTYPE_MGMT)
 548                         local->dot11TransmittedFragmentCount++;
 549         } else {
 550                 if (frag == 0)
 551                         local->dot11FailedCount++;
 552         }
 553
 554         /* this was a transmitted frame, but now we want to reuse it */
 555         skb_orphan(skb);
 556
 557         /*
 558          * This is a bit racy but we can avoid a lot of work
 559          * with this test...
 560          */
 561         if (!local->monitors && !local->cooked_mntrs) {
 562                 dev_kfree_skb(skb);
 563                 return;
 564         }
 565
 566         /* send frame to monitor interfaces now */
 567
 568         if (skb_headroom(skb) < sizeof(*rthdr)) {
 569                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 570                 dev_kfree_skb(skb);
 571                 return;
 572         }
 573
 574         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 575                                 skb_push(skb, sizeof(*rthdr));
 576
 577         memset(rthdr, 0, sizeof(*rthdr));
 578         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 579         rthdr->hdr.it_present =
 580                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 581                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 582                             (1 << IEEE80211_RADIOTAP_RATE));
 583
 584         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 585             !is_multicast_ether_addr(hdr->addr1))
 586                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 587
 588         /*
 589          * XXX: Once radiotap gets the bitmap reset thing the vendor
 590          *      extensions proposal contains, we can actually report
 591          *      the whole set of tries we did.
 592          */
 593         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 594             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 595                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 596         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 597                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 598         if (info->status.rates[0].idx >= 0 &&
 599             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 600                 rthdr->rate = sband->bitrates[
 601                                 info->status.rates[0].idx].bitrate / 5;
 602
 603         /* for now report the total retry_count */
 604         rthdr->data_retries = retry_count;
 605
 606         /* XXX: is this sufficient for BPF? */
 607         skb_set_mac_header(skb, 0);
 608         skb->ip_summed = CHECKSUM_UNNECESSARY;
 609         skb->pkt_type = PACKET_OTHERHOST;
 610         skb->protocol = htons(ETH_P_802_2);
 611         memset(skb->cb, 0, sizeof(skb->cb));
 612
 613         rcu_read_lock();
 614         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 615                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 616                         if (!netif_running(sdata->dev))
 617                                 continue;
 618
 619                         if (prev_dev) {
 620                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 621                                 if (skb2) {
 622                                         skb2->dev = prev_dev;
 623                                         netif_rx(skb2);
 624                                 }
 625                         }
 626
 627                         prev_dev = sdata->dev;
 628                 }
 629         }
 630         if (prev_dev) {
 631                 skb->dev = prev_dev;
 632                 netif_rx(skb);
 633                 skb = NULL;
 634         }
 635         rcu_read_unlock();
 636         dev_kfree_skb(skb);
 637 }
 638 EXPORT_SYMBOL(ieee80211_tx_status);
 639
 640 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 641                                         const struct ieee80211_ops *ops)
 642 {
 643         struct ieee80211_local *local;
 644         int priv_size;
 645         struct wiphy *wiphy;
 646
 647         /* Ensure 32-byte alignment of our private data and hw private data.
 648          * We use the wiphy priv data for both our ieee80211_local and for
 649          * the driver's private data
 650          *
 651          * In memory it'll be like this:
 652          *
 653          * +-------------------------+
 654          * | struct wiphy           |
 655          * +-------------------------+
 656          * | struct ieee80211_local  |
 657          * +-------------------------+
 658          * | driver's private data   |
 659          * +-------------------------+
 660          *
 661          */
 662         priv_size = ((sizeof(struct ieee80211_local) +
 663                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 664                     priv_data_len;
 665
 666         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 667
 668         if (!wiphy)
 669                 return NULL;
 670
 671         wiphy->privid = mac80211_wiphy_privid;
 672
 673         local = wiphy_priv(wiphy);
 674         local->hw.wiphy = wiphy;
 675
 676         local->hw.priv = (char *)local +
 677                          ((sizeof(struct ieee80211_local) +
 678                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 679
 680         BUG_ON(!ops->tx);
 681         BUG_ON(!ops->start);
 682         BUG_ON(!ops->stop);
 683         BUG_ON(!ops->config);
 684         BUG_ON(!ops->add_interface);
 685         BUG_ON(!ops->remove_interface);
 686         BUG_ON(!ops->configure_filter);
 687         local->ops = ops;
 688
 689         /* set up some defaults */
 690         local->hw.queues = 1;
 691         local->hw.max_rates = 1;
 692         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 693         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 694         local->hw.conf.long_frame_max_tx_count = 4;
 695         local->hw.conf.short_frame_max_tx_count = 7;
 696         local->hw.conf.radio_enabled = true;
 697
 698         INIT_LIST_HEAD(&local->interfaces);
 699
 700         spin_lock_init(&local->key_lock);
 701
 702         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 703
 704         sta_info_init(local);
 705
 706         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 707                      (unsigned long)local);
 708         tasklet_disable(&local->tx_pending_tasklet);
 709
 710         tasklet_init(&local->tasklet,
 711                      ieee80211_tasklet_handler,
 712                      (unsigned long) local);
 713         tasklet_disable(&local->tasklet);
 714
 715         skb_queue_head_init(&local->skb_queue);
 716         skb_queue_head_init(&local->skb_queue_unreliable);
 717
 718         return local_to_hw(local);
 719 }
 720 EXPORT_SYMBOL(ieee80211_alloc_hw);
 721
 722 int ieee80211_register_hw(struct ieee80211_hw *hw)
 723 {
 724         struct ieee80211_local *local = hw_to_local(hw);
 725         int result;
 726         enum ieee80211_band band;
 727         struct net_device *mdev;
 728         struct ieee80211_master_priv *mpriv;
 729
 730         /*
 731          * generic code guarantees at least one band,
 732          * set this very early because much code assumes
 733          * that hw.conf.channel is assigned
 734          */
 735         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 736                 struct ieee80211_supported_band *sband;
 737
 738                 sband = local->hw.wiphy->bands[band];
 739                 if (sband) {
 740                         /* init channel we're on */
 741                         local->hw.conf.channel =
 742                         local->oper_channel =
 743                         local->scan_channel = &sband->channels[0];
 744                         break;
 745                 }
 746         }
 747
 748         /* if low-level driver supports AP, we also support VLAN */
 749         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 750                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 751
 752         /* mac80211 always supports monitor */
 753         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 754
 755         result = wiphy_register(local->hw.wiphy);
 756         if (result < 0)
 757                 return result;
 758
 759         /*
 760          * We use the number of queues for feature tests (QoS, HT) internally
 761          * so restrict them appropriately.
 762          */
 763         if (hw->queues > IEEE80211_MAX_QUEUES)
 764                 hw->queues = IEEE80211_MAX_QUEUES;
 765         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 766                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 767         if (hw->queues < 4)
 768                 hw->ampdu_queues = 0;
 769
 770         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 771                                "wmaster%d", ether_setup,
 772                                ieee80211_num_queues(hw));
 773         if (!mdev)
 774                 goto fail_mdev_alloc;
 775
 776         mpriv = netdev_priv(mdev);
 777         mpriv->local = local;
 778         local->mdev = mdev;
 779
 780         ieee80211_rx_bss_list_init(local);
 781
 782         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 783         mdev->open = ieee80211_master_open;
 784         mdev->stop = ieee80211_master_stop;
 785         mdev->type = ARPHRD_IEEE80211;
 786         mdev->header_ops = &ieee80211_header_ops;
 787         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 788
 789         local->hw.workqueue =
 790                 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
 791         if (!local->hw.workqueue) {
 792                 result = -ENOMEM;
 793                 goto fail_workqueue;
 794         }
 795
 796         /*
 797          * The hardware needs headroom for sending the frame,
 798          * and we need some headroom for passing the frame to monitor
 799          * interfaces, but never both at the same time.
 800          */
 801         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 802                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 803
 804         debugfs_hw_add(local);
 805
 806         if (local->hw.conf.beacon_int < 10)
 807                 local->hw.conf.beacon_int = 100;
 808
 809         if (local->hw.max_listen_interval == 0)
 810                 local->hw.max_listen_interval = 1;
 811
 812         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 813
 814         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 815                                                   IEEE80211_HW_SIGNAL_DB |
 816                                                   IEEE80211_HW_SIGNAL_DBM) ?
 817                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 818         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 819                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 820         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 821                 local->wstats_flags |= IW_QUAL_DBM;
 822
 823         result = sta_info_start(local);
 824         if (result < 0)
 825                 goto fail_sta_info;
 826
 827         rtnl_lock();
 828         result = dev_alloc_name(local->mdev, local->mdev->name);
 829         if (result < 0)
 830                 goto fail_dev;
 831
 832         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 833         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 834
 835         result = register_netdevice(local->mdev);
 836         if (result < 0)
 837                 goto fail_dev;
 838
 839         result = ieee80211_init_rate_ctrl_alg(local,
 840                                               hw->rate_control_algorithm);
 841         if (result < 0) {
 842                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 843                        "algorithm\n", wiphy_name(local->hw.wiphy));
 844                 goto fail_rate;
 845         }
 846
 847         result = ieee80211_wep_init(local);
 848
 849         if (result < 0) {
 850                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 851                        wiphy_name(local->hw.wiphy), result);
 852                 goto fail_wep;
 853         }
 854
 855         local->mdev->select_queue = ieee80211_select_queue;
 856
 857         /* add one default STA interface */
 858         result = ieee80211_if_add(local, "wlan%d", NULL,
 859                                   NL80211_IFTYPE_STATION, NULL);
 860         if (result)
 861                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 862                        wiphy_name(local->hw.wiphy));
 863
 864         rtnl_unlock();
 865
 866         ieee80211_led_init(local);
 867
 868         return 0;
 869
 870 fail_wep:
 871         rate_control_deinitialize(local);
 872 fail_rate:
 873         unregister_netdevice(local->mdev);
 874         local->mdev = NULL;
 875 fail_dev:
 876         rtnl_unlock();
 877         sta_info_stop(local);
 878 fail_sta_info:
 879         debugfs_hw_del(local);
 880         destroy_workqueue(local->hw.workqueue);
 881 fail_workqueue:
 882         if (local->mdev)
 883                 free_netdev(local->mdev);
 884 fail_mdev_alloc:
 885         wiphy_unregister(local->hw.wiphy);
 886         return result;
 887 }
 888 EXPORT_SYMBOL(ieee80211_register_hw);
 889
 890 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 891 {
 892         struct ieee80211_local *local = hw_to_local(hw);
 893
 894         tasklet_kill(&local->tx_pending_tasklet);
 895         tasklet_kill(&local->tasklet);
 896
 897         rtnl_lock();
 898
 899         /*
 900          * At this point, interface list manipulations are fine
 901          * because the driver cannot be handing us frames any
 902          * more and the tasklet is killed.
 903          */
 904
 905         /* First, we remove all virtual interfaces. */
 906         ieee80211_remove_interfaces(local);
 907
 908         /* then, finally, remove the master interface */
 909         unregister_netdevice(local->mdev);
 910
 911         rtnl_unlock();
 912
 913         ieee80211_rx_bss_list_deinit(local);
 914         ieee80211_clear_tx_pending(local);
 915         sta_info_stop(local);
 916         rate_control_deinitialize(local);
 917         debugfs_hw_del(local);
 918
 919         if (skb_queue_len(&local->skb_queue)
 920                         || skb_queue_len(&local->skb_queue_unreliable))
 921                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 922                        wiphy_name(local->hw.wiphy));
 923         skb_queue_purge(&local->skb_queue);
 924         skb_queue_purge(&local->skb_queue_unreliable);
 925
 926         destroy_workqueue(local->hw.workqueue);
 927         wiphy_unregister(local->hw.wiphy);
 928         ieee80211_wep_free(local);
 929         ieee80211_led_exit(local);
 930         free_netdev(local->mdev);
 931 }
 932 EXPORT_SYMBOL(ieee80211_unregister_hw);
 933
 934 void ieee80211_free_hw(struct ieee80211_hw *hw)
 935 {
 936         struct ieee80211_local *local = hw_to_local(hw);
 937
 938         wiphy_free(local->hw.wiphy);
 939 }
 940 EXPORT_SYMBOL(ieee80211_free_hw);
 941
 942 static int __init ieee80211_init(void)
 943 {
 944         struct sk_buff *skb;
 945         int ret;
 946
 947         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 948         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 949                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 950
 951         ret = rc80211_minstrel_init();
 952         if (ret)
 953                 return ret;
 954
 955         ret = rc80211_pid_init();
 956         if (ret)
 957                 return ret;
 958
 959         ieee80211_debugfs_netdev_init();
 960
 961         return 0;
 962 }
 963
 964 static void __exit ieee80211_exit(void)
 965 {
 966         rc80211_pid_exit();
 967         rc80211_minstrel_exit();
 968
 969         /*
 970          * For key todo, it'll be empty by now but the work
 971          * might still be scheduled.
 972          */
 973         flush_scheduled_work();
 974
 975         if (mesh_allocated)
 976                 ieee80211s_stop();
 977
 978         ieee80211_debugfs_netdev_exit();
 979 }
 980
 981
 982 subsys_initcall(ieee80211_init);
 983 module_exit(ieee80211_exit);
 984
 985 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 986 MODULE_LICENSE("GPL");