git.oblomov.eu Git - 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         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                 conf.ssid = sdata->u.sta.ssid;
 177                 conf.ssid_len = sdata->u.sta.ssid_len;
 178         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 179                 conf.bssid = sdata->dev->dev_addr;
 180                 conf.ssid = sdata->u.ap.ssid;
 181                 conf.ssid_len = sdata->u.ap.ssid_len;
 182         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 183                 u8 zero[ETH_ALEN] = { 0 };
 184                 conf.bssid = zero;
 185                 conf.ssid = zero;
 186                 conf.ssid_len = 0;
 187         } else {
 188                 WARN_ON(1);
 189                 return -EINVAL;
 190         }
 191
 192         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 193                 return -EINVAL;
 194
 195         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 196                 return -EINVAL;
 197
 198         return local->ops->config_interface(local_to_hw(local),
 199                                             &sdata->vif, &conf);
 200 }
 201
 202 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 203 {
 204         struct ieee80211_channel *chan;
 205         int ret = 0;
 206         int power;
 207
 208         might_sleep();
 209
 210         if (local->sw_scanning)
 211                 chan = local->scan_channel;
 212         else
 213                 chan = local->oper_channel;
 214
 215         if (chan != local->hw.conf.channel) {
 216                 local->hw.conf.channel = chan;
 217                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 218         }
 219
 220
 221         if (!local->hw.conf.power_level)
 222                 power = chan->max_power;
 223         else
 224                 power = min(chan->max_power, local->hw.conf.power_level);
 225         if (local->hw.conf.power_level != power) {
 226                 changed |= IEEE80211_CONF_CHANGE_POWER;
 227                 local->hw.conf.power_level = power;
 228         }
 229
 230         if (changed && local->open_count) {
 231                 ret = local->ops->config(local_to_hw(local), changed);
 232                 /*
 233                  * HW reconfiguration should never fail, the driver has told
 234                  * us what it can support so it should live up to that promise.
 235                  */
 236                 WARN_ON(ret);
 237         }
 238
 239         return ret;
 240 }
 241
 242 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 243                                       u32 changed)
 244 {
 245         struct ieee80211_local *local = sdata->local;
 246
 247         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 248                 return;
 249
 250         if (!changed)
 251                 return;
 252
 253         if (local->ops->bss_info_changed)
 254                 local->ops->bss_info_changed(local_to_hw(local),
 255                                              &sdata->vif,
 256                                              &sdata->vif.bss_conf,
 257                                              changed);
 258 }
 259
 260 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 261 {
 262         sdata->vif.bss_conf.use_cts_prot = false;
 263         sdata->vif.bss_conf.use_short_preamble = false;
 264         sdata->vif.bss_conf.use_short_slot = false;
 265         return BSS_CHANGED_ERP_CTS_PROT |
 266                BSS_CHANGED_ERP_PREAMBLE |
 267                BSS_CHANGED_ERP_SLOT;
 268 }
 269
 270 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 271                                  struct sk_buff *skb)
 272 {
 273         struct ieee80211_local *local = hw_to_local(hw);
 274         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 275         int tmp;
 276
 277         skb->dev = local->mdev;
 278         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 279         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 280                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 281         tmp = skb_queue_len(&local->skb_queue) +
 282                 skb_queue_len(&local->skb_queue_unreliable);
 283         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 284                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 285                 dev_kfree_skb_irq(skb);
 286                 tmp--;
 287                 I802_DEBUG_INC(local->tx_status_drop);
 288         }
 289         tasklet_schedule(&local->tasklet);
 290 }
 291 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 292
 293 static void ieee80211_tasklet_handler(unsigned long data)
 294 {
 295         struct ieee80211_local *local = (struct ieee80211_local *) data;
 296         struct sk_buff *skb;
 297         struct ieee80211_rx_status rx_status;
 298         struct ieee80211_ra_tid *ra_tid;
 299
 300         while ((skb = skb_dequeue(&local->skb_queue)) ||
 301                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 302                 switch (skb->pkt_type) {
 303                 case IEEE80211_RX_MSG:
 304                         /* status is in skb->cb */
 305                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 306                         /* Clear skb->pkt_type in order to not confuse kernel
 307                          * netstack. */
 308                         skb->pkt_type = 0;
 309                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 310                         break;
 311                 case IEEE80211_TX_STATUS_MSG:
 312                         skb->pkt_type = 0;
 313                         ieee80211_tx_status(local_to_hw(local), skb);
 314                         break;
 315                 case IEEE80211_DELBA_MSG:
 316                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 317                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 318                                                 ra_tid->ra, ra_tid->tid);
 319                         dev_kfree_skb(skb);
 320                         break;
 321                 case IEEE80211_ADDBA_MSG:
 322                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 323                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 324                                                  ra_tid->ra, ra_tid->tid);
 325                         dev_kfree_skb(skb);
 326                         break ;
 327                 default:
 328                         WARN_ON(1);
 329                         dev_kfree_skb(skb);
 330                         break;
 331                 }
 332         }
 333 }
 334
 335 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 336  * make a prepared TX frame (one that has been given to hw) to look like brand
 337  * new IEEE 802.11 frame that is ready to go through TX processing again.
 338  */
 339 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 340                                       struct ieee80211_key *key,
 341                                       struct sk_buff *skb)
 342 {
 343         unsigned int hdrlen, iv_len, mic_len;
 344         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 345
 346         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 347
 348         if (!key)
 349                 goto no_key;
 350
 351         switch (key->conf.alg) {
 352         case ALG_WEP:
 353                 iv_len = WEP_IV_LEN;
 354                 mic_len = WEP_ICV_LEN;
 355                 break;
 356         case ALG_TKIP:
 357                 iv_len = TKIP_IV_LEN;
 358                 mic_len = TKIP_ICV_LEN;
 359                 break;
 360         case ALG_CCMP:
 361                 iv_len = CCMP_HDR_LEN;
 362                 mic_len = CCMP_MIC_LEN;
 363                 break;
 364         default:
 365                 goto no_key;
 366         }
 367
 368         if (skb->len >= hdrlen + mic_len &&
 369             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 370                 skb_trim(skb, skb->len - mic_len);
 371         if (skb->len >= hdrlen + iv_len) {
 372                 memmove(skb->data + iv_len, skb->data, hdrlen);
 373                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 374         }
 375
 376 no_key:
 377         if (ieee80211_is_data_qos(hdr->frame_control)) {
 378                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 379                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 380                         hdrlen - IEEE80211_QOS_CTL_LEN);
 381                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 382         }
 383 }
 384
 385 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 386                                             struct sta_info *sta,
 387                                             struct sk_buff *skb)
 388 {
 389         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 390
 391         sta->tx_filtered_count++;
 392
 393         /*
 394          * Clear the TX filter mask for this STA when sending the next
 395          * packet. If the STA went to power save mode, this will happen
 396          * when it wakes up for the next time.
 397          */
 398         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 399
 400         /*
 401          * This code races in the following way:
 402          *
 403          *  (1) STA sends frame indicating it will go to sleep and does so
 404          *  (2) hardware/firmware adds STA to filter list, passes frame up
 405          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 406          *  (4) we get TX status before having processed the frame and
 407          *      knowing that the STA has gone to sleep.
 408          *
 409          * This is actually quite unlikely even when both those events are
 410          * processed from interrupts coming in quickly after one another or
 411          * even at the same time because we queue both TX status events and
 412          * RX frames to be processed by a tasklet and process them in the
 413          * same order that they were received or TX status last. Hence, there
 414          * is no race as long as the frame RX is processed before the next TX
 415          * status, which drivers can ensure, see below.
 416          *
 417          * Note that this can only happen if the hardware or firmware can
 418          * actually add STAs to the filter list, if this is done by the
 419          * driver in response to set_tim() (which will only reduce the race
 420          * this whole filtering tries to solve, not completely solve it)
 421          * this situation cannot happen.
 422          *
 423          * To completely solve this race drivers need to make sure that they
 424          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 425          *      functions and
 426          *  (b) always process RX events before TX status events if ordering
 427          *      can be unknown, for example with different interrupt status
 428          *      bits.
 429          */
 430         if (test_sta_flags(sta, WLAN_STA_PS) &&
 431             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 432                 ieee80211_remove_tx_extra(local, sta->key, skb);
 433                 skb_queue_tail(&sta->tx_filtered, skb);
 434                 return;
 435         }
 436
 437         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 438             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
 439                 /* Software retry the packet once */
 440                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 441                 ieee80211_remove_tx_extra(local, sta->key, skb);
 442                 dev_queue_xmit(skb);
 443                 return;
 444         }
 445
 446 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 447         if (net_ratelimit())
 448                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 449                        "queue_len=%d PS=%d @%lu\n",
 450                        wiphy_name(local->hw.wiphy),
 451                        skb_queue_len(&sta->tx_filtered),
 452                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 453 #endif
 454         dev_kfree_skb(skb);
 455 }
 456
 457 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 458 {
 459         struct sk_buff *skb2;
 460         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 461         struct ieee80211_local *local = hw_to_local(hw);
 462         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 463         u16 frag, type;
 464         __le16 fc;
 465         struct ieee80211_supported_band *sband;
 466         struct ieee80211_tx_status_rtap_hdr *rthdr;
 467         struct ieee80211_sub_if_data *sdata;
 468         struct net_device *prev_dev = NULL;
 469         struct sta_info *sta;
 470         int retry_count = -1, i;
 471
 472         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 473                 /* the HW cannot have attempted that rate */
 474                 if (i >= hw->max_rates) {
 475                         info->status.rates[i].idx = -1;
 476                         info->status.rates[i].count = 0;
 477                 }
 478
 479                 retry_count += info->status.rates[i].count;
 480         }
 481         if (retry_count < 0)
 482                 retry_count = 0;
 483
 484         rcu_read_lock();
 485
 486         sband = local->hw.wiphy->bands[info->band];
 487
 488         sta = sta_info_get(local, hdr->addr1);
 489
 490         if (sta) {
 491                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 492                     test_sta_flags(sta, WLAN_STA_PS)) {
 493                         /*
 494                          * The STA is in power save mode, so assume
 495                          * that this TX packet failed because of that.
 496                          */
 497                         ieee80211_handle_filtered_frame(local, sta, skb);
 498                         rcu_read_unlock();
 499                         return;
 500                 }
 501
 502                 fc = hdr->frame_control;
 503
 504                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 505                     (ieee80211_is_data_qos(fc))) {
 506                         u16 tid, ssn;
 507                         u8 *qc;
 508
 509                         qc = ieee80211_get_qos_ctl(hdr);
 510                         tid = qc[0] & 0xf;
 511                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 512                                                 & IEEE80211_SCTL_SEQ);
 513                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 514                                            tid, ssn);
 515                 }
 516
 517                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 518                         ieee80211_handle_filtered_frame(local, sta, skb);
 519                         rcu_read_unlock();
 520                         return;
 521                 } else {
 522                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 523                                 sta->tx_retry_failed++;
 524                         sta->tx_retry_count += retry_count;
 525                 }
 526
 527                 rate_control_tx_status(local, sband, sta, skb);
 528         }
 529
 530         rcu_read_unlock();
 531
 532         ieee80211_led_tx(local, 0);
 533
 534         /* SNMP counters
 535          * Fragments are passed to low-level drivers as separate skbs, so these
 536          * are actually fragments, not frames. Update frame counters only for
 537          * the first fragment of the frame. */
 538
 539         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 540         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 541
 542         if (info->flags & IEEE80211_TX_STAT_ACK) {
 543                 if (frag == 0) {
 544                         local->dot11TransmittedFrameCount++;
 545                         if (is_multicast_ether_addr(hdr->addr1))
 546                                 local->dot11MulticastTransmittedFrameCount++;
 547                         if (retry_count > 0)
 548                                 local->dot11RetryCount++;
 549                         if (retry_count > 1)
 550                                 local->dot11MultipleRetryCount++;
 551                 }
 552
 553                 /* This counter shall be incremented for an acknowledged MPDU
 554                  * with an individual address in the address 1 field or an MPDU
 555                  * with a multicast address in the address 1 field of type Data
 556                  * or Management. */
 557                 if (!is_multicast_ether_addr(hdr->addr1) ||
 558                     type == IEEE80211_FTYPE_DATA ||
 559                     type == IEEE80211_FTYPE_MGMT)
 560                         local->dot11TransmittedFragmentCount++;
 561         } else {
 562                 if (frag == 0)
 563                         local->dot11FailedCount++;
 564         }
 565
 566         /* this was a transmitted frame, but now we want to reuse it */
 567         skb_orphan(skb);
 568
 569         /*
 570          * This is a bit racy but we can avoid a lot of work
 571          * with this test...
 572          */
 573         if (!local->monitors && !local->cooked_mntrs) {
 574                 dev_kfree_skb(skb);
 575                 return;
 576         }
 577
 578         /* send frame to monitor interfaces now */
 579
 580         if (skb_headroom(skb) < sizeof(*rthdr)) {
 581                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 582                 dev_kfree_skb(skb);
 583                 return;
 584         }
 585
 586         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 587                                 skb_push(skb, sizeof(*rthdr));
 588
 589         memset(rthdr, 0, sizeof(*rthdr));
 590         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 591         rthdr->hdr.it_present =
 592                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 593                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 594                             (1 << IEEE80211_RADIOTAP_RATE));
 595
 596         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 597             !is_multicast_ether_addr(hdr->addr1))
 598                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 599
 600         /*
 601          * XXX: Once radiotap gets the bitmap reset thing the vendor
 602          *      extensions proposal contains, we can actually report
 603          *      the whole set of tries we did.
 604          */
 605         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 606             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 607                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 608         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 609                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 610         if (info->status.rates[0].idx >= 0 &&
 611             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 612                 rthdr->rate = sband->bitrates[
 613                                 info->status.rates[0].idx].bitrate / 5;
 614
 615         /* for now report the total retry_count */
 616         rthdr->data_retries = retry_count;
 617
 618         /* XXX: is this sufficient for BPF? */
 619         skb_set_mac_header(skb, 0);
 620         skb->ip_summed = CHECKSUM_UNNECESSARY;
 621         skb->pkt_type = PACKET_OTHERHOST;
 622         skb->protocol = htons(ETH_P_802_2);
 623         memset(skb->cb, 0, sizeof(skb->cb));
 624
 625         rcu_read_lock();
 626         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 627                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 628                         if (!netif_running(sdata->dev))
 629                                 continue;
 630
 631                         if (prev_dev) {
 632                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 633                                 if (skb2) {
 634                                         skb2->dev = prev_dev;
 635                                         netif_rx(skb2);
 636                                 }
 637                         }
 638
 639                         prev_dev = sdata->dev;
 640                 }
 641         }
 642         if (prev_dev) {
 643                 skb->dev = prev_dev;
 644                 netif_rx(skb);
 645                 skb = NULL;
 646         }
 647         rcu_read_unlock();
 648         dev_kfree_skb(skb);
 649 }
 650 EXPORT_SYMBOL(ieee80211_tx_status);
 651
 652 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 653                                         const struct ieee80211_ops *ops)
 654 {
 655         struct ieee80211_local *local;
 656         int priv_size;
 657         struct wiphy *wiphy;
 658
 659         /* Ensure 32-byte alignment of our private data and hw private data.
 660          * We use the wiphy priv data for both our ieee80211_local and for
 661          * the driver's private data
 662          *
 663          * In memory it'll be like this:
 664          *
 665          * +-------------------------+
 666          * | struct wiphy           |
 667          * +-------------------------+
 668          * | struct ieee80211_local  |
 669          * +-------------------------+
 670          * | driver's private data   |
 671          * +-------------------------+
 672          *
 673          */
 674         priv_size = ((sizeof(struct ieee80211_local) +
 675                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 676                     priv_data_len;
 677
 678         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 679
 680         if (!wiphy)
 681                 return NULL;
 682
 683         wiphy->privid = mac80211_wiphy_privid;
 684
 685         local = wiphy_priv(wiphy);
 686         local->hw.wiphy = wiphy;
 687
 688         local->hw.priv = (char *)local +
 689                          ((sizeof(struct ieee80211_local) +
 690                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 691
 692         BUG_ON(!ops->tx);
 693         BUG_ON(!ops->start);
 694         BUG_ON(!ops->stop);
 695         BUG_ON(!ops->config);
 696         BUG_ON(!ops->add_interface);
 697         BUG_ON(!ops->remove_interface);
 698         BUG_ON(!ops->configure_filter);
 699         local->ops = ops;
 700
 701         /* set up some defaults */
 702         local->hw.queues = 1;
 703         local->hw.max_rates = 1;
 704         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 705         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 706         local->hw.conf.long_frame_max_tx_count = 4;
 707         local->hw.conf.short_frame_max_tx_count = 7;
 708         local->hw.conf.radio_enabled = true;
 709
 710         INIT_LIST_HEAD(&local->interfaces);
 711
 712         spin_lock_init(&local->key_lock);
 713
 714         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 715
 716         sta_info_init(local);
 717
 718         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 719                      (unsigned long)local);
 720         tasklet_disable(&local->tx_pending_tasklet);
 721
 722         tasklet_init(&local->tasklet,
 723                      ieee80211_tasklet_handler,
 724                      (unsigned long) local);
 725         tasklet_disable(&local->tasklet);
 726
 727         skb_queue_head_init(&local->skb_queue);
 728         skb_queue_head_init(&local->skb_queue_unreliable);
 729
 730         return local_to_hw(local);
 731 }
 732 EXPORT_SYMBOL(ieee80211_alloc_hw);
 733
 734 int ieee80211_register_hw(struct ieee80211_hw *hw)
 735 {
 736         struct ieee80211_local *local = hw_to_local(hw);
 737         const char *name;
 738         int result;
 739         enum ieee80211_band band;
 740         struct net_device *mdev;
 741         struct ieee80211_master_priv *mpriv;
 742
 743         /*
 744          * generic code guarantees at least one band,
 745          * set this very early because much code assumes
 746          * that hw.conf.channel is assigned
 747          */
 748         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 749                 struct ieee80211_supported_band *sband;
 750
 751                 sband = local->hw.wiphy->bands[band];
 752                 if (sband) {
 753                         /* init channel we're on */
 754                         local->hw.conf.channel =
 755                         local->oper_channel =
 756                         local->scan_channel = &sband->channels[0];
 757                         break;
 758                 }
 759         }
 760
 761         /* if low-level driver supports AP, we also support VLAN */
 762         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 763                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 764
 765         /* mac80211 always supports monitor */
 766         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 767
 768         result = wiphy_register(local->hw.wiphy);
 769         if (result < 0)
 770                 return result;
 771
 772         /*
 773          * We use the number of queues for feature tests (QoS, HT) internally
 774          * so restrict them appropriately.
 775          */
 776         if (hw->queues > IEEE80211_MAX_QUEUES)
 777                 hw->queues = IEEE80211_MAX_QUEUES;
 778         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 779                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 780         if (hw->queues < 4)
 781                 hw->ampdu_queues = 0;
 782
 783         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 784                                "wmaster%d", ether_setup,
 785                                ieee80211_num_queues(hw));
 786         if (!mdev)
 787                 goto fail_mdev_alloc;
 788
 789         mpriv = netdev_priv(mdev);
 790         mpriv->local = local;
 791         local->mdev = mdev;
 792
 793         ieee80211_rx_bss_list_init(local);
 794
 795         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 796         mdev->open = ieee80211_master_open;
 797         mdev->stop = ieee80211_master_stop;
 798         mdev->type = ARPHRD_IEEE80211;
 799         mdev->header_ops = &ieee80211_header_ops;
 800         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 801
 802         name = wiphy_dev(local->hw.wiphy)->driver->name;
 803         local->hw.workqueue = create_freezeable_workqueue(name);
 804         if (!local->hw.workqueue) {
 805                 result = -ENOMEM;
 806                 goto fail_workqueue;
 807         }
 808
 809         /*
 810          * The hardware needs headroom for sending the frame,
 811          * and we need some headroom for passing the frame to monitor
 812          * interfaces, but never both at the same time.
 813          */
 814         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 815                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 816
 817         debugfs_hw_add(local);
 818
 819         if (local->hw.conf.beacon_int < 10)
 820                 local->hw.conf.beacon_int = 100;
 821
 822         if (local->hw.max_listen_interval == 0)
 823                 local->hw.max_listen_interval = 1;
 824
 825         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 826
 827         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 828                                                   IEEE80211_HW_SIGNAL_DB |
 829                                                   IEEE80211_HW_SIGNAL_DBM) ?
 830                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 831         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 832                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 833         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 834                 local->wstats_flags |= IW_QUAL_DBM;
 835
 836         result = sta_info_start(local);
 837         if (result < 0)
 838                 goto fail_sta_info;
 839
 840         rtnl_lock();
 841         result = dev_alloc_name(local->mdev, local->mdev->name);
 842         if (result < 0)
 843                 goto fail_dev;
 844
 845         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 846         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 847
 848         result = register_netdevice(local->mdev);
 849         if (result < 0)
 850                 goto fail_dev;
 851
 852         result = ieee80211_init_rate_ctrl_alg(local,
 853                                               hw->rate_control_algorithm);
 854         if (result < 0) {
 855                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 856                        "algorithm\n", wiphy_name(local->hw.wiphy));
 857                 goto fail_rate;
 858         }
 859
 860         result = ieee80211_wep_init(local);
 861
 862         if (result < 0) {
 863                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 864                        wiphy_name(local->hw.wiphy), result);
 865                 goto fail_wep;
 866         }
 867
 868         local->mdev->select_queue = ieee80211_select_queue;
 869
 870         /* add one default STA interface */
 871         result = ieee80211_if_add(local, "wlan%d", NULL,
 872                                   NL80211_IFTYPE_STATION, NULL);
 873         if (result)
 874                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 875                        wiphy_name(local->hw.wiphy));
 876
 877         rtnl_unlock();
 878
 879         ieee80211_led_init(local);
 880
 881         return 0;
 882
 883 fail_wep:
 884         rate_control_deinitialize(local);
 885 fail_rate:
 886         unregister_netdevice(local->mdev);
 887         local->mdev = NULL;
 888 fail_dev:
 889         rtnl_unlock();
 890         sta_info_stop(local);
 891 fail_sta_info:
 892         debugfs_hw_del(local);
 893         destroy_workqueue(local->hw.workqueue);
 894 fail_workqueue:
 895         if (local->mdev)
 896                 free_netdev(local->mdev);
 897 fail_mdev_alloc:
 898         wiphy_unregister(local->hw.wiphy);
 899         return result;
 900 }
 901 EXPORT_SYMBOL(ieee80211_register_hw);
 902
 903 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 904 {
 905         struct ieee80211_local *local = hw_to_local(hw);
 906
 907         tasklet_kill(&local->tx_pending_tasklet);
 908         tasklet_kill(&local->tasklet);
 909
 910         rtnl_lock();
 911
 912         /*
 913          * At this point, interface list manipulations are fine
 914          * because the driver cannot be handing us frames any
 915          * more and the tasklet is killed.
 916          */
 917
 918         /* First, we remove all virtual interfaces. */
 919         ieee80211_remove_interfaces(local);
 920
 921         /* then, finally, remove the master interface */
 922         unregister_netdevice(local->mdev);
 923
 924         rtnl_unlock();
 925
 926         ieee80211_rx_bss_list_deinit(local);
 927         ieee80211_clear_tx_pending(local);
 928         sta_info_stop(local);
 929         rate_control_deinitialize(local);
 930         debugfs_hw_del(local);
 931
 932         if (skb_queue_len(&local->skb_queue)
 933                         || skb_queue_len(&local->skb_queue_unreliable))
 934                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 935                        wiphy_name(local->hw.wiphy));
 936         skb_queue_purge(&local->skb_queue);
 937         skb_queue_purge(&local->skb_queue_unreliable);
 938
 939         destroy_workqueue(local->hw.workqueue);
 940         wiphy_unregister(local->hw.wiphy);
 941         ieee80211_wep_free(local);
 942         ieee80211_led_exit(local);
 943         free_netdev(local->mdev);
 944 }
 945 EXPORT_SYMBOL(ieee80211_unregister_hw);
 946
 947 void ieee80211_free_hw(struct ieee80211_hw *hw)
 948 {
 949         struct ieee80211_local *local = hw_to_local(hw);
 950
 951         wiphy_free(local->hw.wiphy);
 952 }
 953 EXPORT_SYMBOL(ieee80211_free_hw);
 954
 955 static int __init ieee80211_init(void)
 956 {
 957         struct sk_buff *skb;
 958         int ret;
 959
 960         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 961         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 962                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 963
 964         ret = rc80211_minstrel_init();
 965         if (ret)
 966                 return ret;
 967
 968         ret = rc80211_pid_init();
 969         if (ret)
 970                 return ret;
 971
 972         ieee80211_debugfs_netdev_init();
 973
 974         return 0;
 975 }
 976
 977 static void __exit ieee80211_exit(void)
 978 {
 979         rc80211_pid_exit();
 980         rc80211_minstrel_exit();
 981
 982         /*
 983          * For key todo, it'll be empty by now but the work
 984          * might still be scheduled.
 985          */
 986         flush_scheduled_work();
 987
 988         if (mesh_allocated)
 989                 ieee80211s_stop();
 990
 991         ieee80211_debugfs_netdev_exit();
 992 }
 993
 994
 995 subsys_initcall(ieee80211_init);
 996 module_exit(ieee80211_exit);
 997
 998 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 999 MODULE_LICENSE("GPL");