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   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         enum nl80211_channel_type channel_type;
 199
 200         might_sleep();
 201
 202         if (local->sw_scanning) {
 203                 chan = local->scan_channel;
 204                 channel_type = NL80211_CHAN_NO_HT;
 205         } else {
 206                 chan = local->oper_channel;
 207                 channel_type = local->oper_channel_type;
 208         }
 209
 210         if (chan != local->hw.conf.channel ||
 211             channel_type != local->hw.conf.ht.channel_type) {
 212                 local->hw.conf.channel = chan;
 213                 local->hw.conf.ht.channel_type = channel_type;
 214                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 215         }
 216
 217         if (!local->hw.conf.user_power_level)
 218                 power = chan->max_power;
 219         else
 220                 power = min(chan->max_power, local->hw.conf.user_power_level);
 221         if (local->hw.conf.power_level != power) {
 222                 changed |= IEEE80211_CONF_CHANGE_POWER;
 223                 local->hw.conf.power_level = power;
 224         }
 225
 226         if (changed && local->open_count) {
 227                 ret = local->ops->config(local_to_hw(local), changed);
 228                 /*
 229                  * Goal:
 230                  * HW reconfiguration should never fail, the driver has told
 231                  * us what it can support so it should live up to that promise.
 232                  *
 233                  * Current status:
 234                  * rfkill is not integrated with mac80211 and a
 235                  * configuration command can thus fail if hardware rfkill
 236                  * is enabled
 237                  *
 238                  * FIXME: integrate rfkill with mac80211 and then add this
 239                  * WARN_ON() back
 240                  *
 241                  */
 242                 /* WARN_ON(ret); */
 243         }
 244
 245         return ret;
 246 }
 247
 248 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 249                                       u32 changed)
 250 {
 251         struct ieee80211_local *local = sdata->local;
 252
 253         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 254                 return;
 255
 256         if (!changed)
 257                 return;
 258
 259         if (local->ops->bss_info_changed)
 260                 local->ops->bss_info_changed(local_to_hw(local),
 261                                              &sdata->vif,
 262                                              &sdata->vif.bss_conf,
 263                                              changed);
 264 }
 265
 266 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 267 {
 268         sdata->vif.bss_conf.use_cts_prot = false;
 269         sdata->vif.bss_conf.use_short_preamble = false;
 270         sdata->vif.bss_conf.use_short_slot = false;
 271         return BSS_CHANGED_ERP_CTS_PROT |
 272                BSS_CHANGED_ERP_PREAMBLE |
 273                BSS_CHANGED_ERP_SLOT;
 274 }
 275
 276 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 277                                  struct sk_buff *skb)
 278 {
 279         struct ieee80211_local *local = hw_to_local(hw);
 280         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 281         int tmp;
 282
 283         skb->dev = local->mdev;
 284         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 285         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 286                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 287         tmp = skb_queue_len(&local->skb_queue) +
 288                 skb_queue_len(&local->skb_queue_unreliable);
 289         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 290                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 291                 dev_kfree_skb_irq(skb);
 292                 tmp--;
 293                 I802_DEBUG_INC(local->tx_status_drop);
 294         }
 295         tasklet_schedule(&local->tasklet);
 296 }
 297 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 298
 299 static void ieee80211_tasklet_handler(unsigned long data)
 300 {
 301         struct ieee80211_local *local = (struct ieee80211_local *) data;
 302         struct sk_buff *skb;
 303         struct ieee80211_rx_status rx_status;
 304         struct ieee80211_ra_tid *ra_tid;
 305
 306         while ((skb = skb_dequeue(&local->skb_queue)) ||
 307                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 308                 switch (skb->pkt_type) {
 309                 case IEEE80211_RX_MSG:
 310                         /* status is in skb->cb */
 311                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 312                         /* Clear skb->pkt_type in order to not confuse kernel
 313                          * netstack. */
 314                         skb->pkt_type = 0;
 315                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 316                         break;
 317                 case IEEE80211_TX_STATUS_MSG:
 318                         skb->pkt_type = 0;
 319                         ieee80211_tx_status(local_to_hw(local), skb);
 320                         break;
 321                 case IEEE80211_DELBA_MSG:
 322                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 323                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 324                                                 ra_tid->ra, ra_tid->tid);
 325                         dev_kfree_skb(skb);
 326                         break;
 327                 case IEEE80211_ADDBA_MSG:
 328                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 329                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 330                                                  ra_tid->ra, ra_tid->tid);
 331                         dev_kfree_skb(skb);
 332                         break ;
 333                 default:
 334                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 335                              skb->pkt_type);
 336                         dev_kfree_skb(skb);
 337                         break;
 338                 }
 339         }
 340 }
 341
 342 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 343  * make a prepared TX frame (one that has been given to hw) to look like brand
 344  * new IEEE 802.11 frame that is ready to go through TX processing again.
 345  */
 346 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 347                                       struct ieee80211_key *key,
 348                                       struct sk_buff *skb)
 349 {
 350         unsigned int hdrlen, iv_len, mic_len;
 351         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 352
 353         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 354
 355         if (!key)
 356                 goto no_key;
 357
 358         switch (key->conf.alg) {
 359         case ALG_WEP:
 360                 iv_len = WEP_IV_LEN;
 361                 mic_len = WEP_ICV_LEN;
 362                 break;
 363         case ALG_TKIP:
 364                 iv_len = TKIP_IV_LEN;
 365                 mic_len = TKIP_ICV_LEN;
 366                 break;
 367         case ALG_CCMP:
 368                 iv_len = CCMP_HDR_LEN;
 369                 mic_len = CCMP_MIC_LEN;
 370                 break;
 371         default:
 372                 goto no_key;
 373         }
 374
 375         if (skb->len >= hdrlen + mic_len &&
 376             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 377                 skb_trim(skb, skb->len - mic_len);
 378         if (skb->len >= hdrlen + iv_len) {
 379                 memmove(skb->data + iv_len, skb->data, hdrlen);
 380                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 381         }
 382
 383 no_key:
 384         if (ieee80211_is_data_qos(hdr->frame_control)) {
 385                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 386                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 387                         hdrlen - IEEE80211_QOS_CTL_LEN);
 388                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 389         }
 390 }
 391
 392 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 393                                             struct sta_info *sta,
 394                                             struct sk_buff *skb)
 395 {
 396         sta->tx_filtered_count++;
 397
 398         /*
 399          * Clear the TX filter mask for this STA when sending the next
 400          * packet. If the STA went to power save mode, this will happen
 401          * when it wakes up for the next time.
 402          */
 403         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 404
 405         /*
 406          * This code races in the following way:
 407          *
 408          *  (1) STA sends frame indicating it will go to sleep and does so
 409          *  (2) hardware/firmware adds STA to filter list, passes frame up
 410          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 411          *  (4) we get TX status before having processed the frame and
 412          *      knowing that the STA has gone to sleep.
 413          *
 414          * This is actually quite unlikely even when both those events are
 415          * processed from interrupts coming in quickly after one another or
 416          * even at the same time because we queue both TX status events and
 417          * RX frames to be processed by a tasklet and process them in the
 418          * same order that they were received or TX status last. Hence, there
 419          * is no race as long as the frame RX is processed before the next TX
 420          * status, which drivers can ensure, see below.
 421          *
 422          * Note that this can only happen if the hardware or firmware can
 423          * actually add STAs to the filter list, if this is done by the
 424          * driver in response to set_tim() (which will only reduce the race
 425          * this whole filtering tries to solve, not completely solve it)
 426          * this situation cannot happen.
 427          *
 428          * To completely solve this race drivers need to make sure that they
 429          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 430          *      functions and
 431          *  (b) always process RX events before TX status events if ordering
 432          *      can be unknown, for example with different interrupt status
 433          *      bits.
 434          */
 435         if (test_sta_flags(sta, WLAN_STA_PS) &&
 436             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 437                 ieee80211_remove_tx_extra(local, sta->key, skb);
 438                 skb_queue_tail(&sta->tx_filtered, skb);
 439                 return;
 440         }
 441
 442         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 443                 /* Software retry the packet once */
 444                 skb->requeue = 1;
 445                 ieee80211_remove_tx_extra(local, sta->key, skb);
 446                 dev_queue_xmit(skb);
 447                 return;
 448         }
 449
 450 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 451         if (net_ratelimit())
 452                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 453                        "queue_len=%d PS=%d @%lu\n",
 454                        wiphy_name(local->hw.wiphy),
 455                        skb_queue_len(&sta->tx_filtered),
 456                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 457 #endif
 458         dev_kfree_skb(skb);
 459 }
 460
 461 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 462 {
 463         struct sk_buff *skb2;
 464         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 465         struct ieee80211_local *local = hw_to_local(hw);
 466         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 467         u16 frag, type;
 468         __le16 fc;
 469         struct ieee80211_supported_band *sband;
 470         struct ieee80211_tx_status_rtap_hdr *rthdr;
 471         struct ieee80211_sub_if_data *sdata;
 472         struct net_device *prev_dev = NULL;
 473         struct sta_info *sta;
 474         int retry_count = -1, i;
 475
 476         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 477                 /* the HW cannot have attempted that rate */
 478                 if (i >= hw->max_rates) {
 479                         info->status.rates[i].idx = -1;
 480                         info->status.rates[i].count = 0;
 481                 }
 482
 483                 retry_count += info->status.rates[i].count;
 484         }
 485         if (retry_count < 0)
 486                 retry_count = 0;
 487
 488         rcu_read_lock();
 489
 490         sband = local->hw.wiphy->bands[info->band];
 491
 492         sta = sta_info_get(local, hdr->addr1);
 493
 494         if (sta) {
 495                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 496                     test_sta_flags(sta, WLAN_STA_PS)) {
 497                         /*
 498                          * The STA is in power save mode, so assume
 499                          * that this TX packet failed because of that.
 500                          */
 501                         ieee80211_handle_filtered_frame(local, sta, skb);
 502                         rcu_read_unlock();
 503                         return;
 504                 }
 505
 506                 fc = hdr->frame_control;
 507
 508                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 509                     (ieee80211_is_data_qos(fc))) {
 510                         u16 tid, ssn;
 511                         u8 *qc;
 512
 513                         qc = ieee80211_get_qos_ctl(hdr);
 514                         tid = qc[0] & 0xf;
 515                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 516                                                 & IEEE80211_SCTL_SEQ);
 517                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 518                                            tid, ssn);
 519                 }
 520
 521                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 522                         ieee80211_handle_filtered_frame(local, sta, skb);
 523                         rcu_read_unlock();
 524                         return;
 525                 } else {
 526                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 527                                 sta->tx_retry_failed++;
 528                         sta->tx_retry_count += retry_count;
 529                 }
 530
 531                 rate_control_tx_status(local, sband, sta, skb);
 532         }
 533
 534         rcu_read_unlock();
 535
 536         ieee80211_led_tx(local, 0);
 537
 538         /* SNMP counters
 539          * Fragments are passed to low-level drivers as separate skbs, so these
 540          * are actually fragments, not frames. Update frame counters only for
 541          * the first fragment of the frame. */
 542
 543         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 544         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 545
 546         if (info->flags & IEEE80211_TX_STAT_ACK) {
 547                 if (frag == 0) {
 548                         local->dot11TransmittedFrameCount++;
 549                         if (is_multicast_ether_addr(hdr->addr1))
 550                                 local->dot11MulticastTransmittedFrameCount++;
 551                         if (retry_count > 0)
 552                                 local->dot11RetryCount++;
 553                         if (retry_count > 1)
 554                                 local->dot11MultipleRetryCount++;
 555                 }
 556
 557                 /* This counter shall be incremented for an acknowledged MPDU
 558                  * with an individual address in the address 1 field or an MPDU
 559                  * with a multicast address in the address 1 field of type Data
 560                  * or Management. */
 561                 if (!is_multicast_ether_addr(hdr->addr1) ||
 562                     type == IEEE80211_FTYPE_DATA ||
 563                     type == IEEE80211_FTYPE_MGMT)
 564                         local->dot11TransmittedFragmentCount++;
 565         } else {
 566                 if (frag == 0)
 567                         local->dot11FailedCount++;
 568         }
 569
 570         /* this was a transmitted frame, but now we want to reuse it */
 571         skb_orphan(skb);
 572
 573         /*
 574          * This is a bit racy but we can avoid a lot of work
 575          * with this test...
 576          */
 577         if (!local->monitors && !local->cooked_mntrs) {
 578                 dev_kfree_skb(skb);
 579                 return;
 580         }
 581
 582         /* send frame to monitor interfaces now */
 583
 584         if (skb_headroom(skb) < sizeof(*rthdr)) {
 585                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 586                 dev_kfree_skb(skb);
 587                 return;
 588         }
 589
 590         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 591                                 skb_push(skb, sizeof(*rthdr));
 592
 593         memset(rthdr, 0, sizeof(*rthdr));
 594         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 595         rthdr->hdr.it_present =
 596                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 597                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 598                             (1 << IEEE80211_RADIOTAP_RATE));
 599
 600         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 601             !is_multicast_ether_addr(hdr->addr1))
 602                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 603
 604         /*
 605          * XXX: Once radiotap gets the bitmap reset thing the vendor
 606          *      extensions proposal contains, we can actually report
 607          *      the whole set of tries we did.
 608          */
 609         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 610             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 611                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 612         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 613                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 614         if (info->status.rates[0].idx >= 0 &&
 615             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 616                 rthdr->rate = sband->bitrates[
 617                                 info->status.rates[0].idx].bitrate / 5;
 618
 619         /* for now report the total retry_count */
 620         rthdr->data_retries = retry_count;
 621
 622         /* XXX: is this sufficient for BPF? */
 623         skb_set_mac_header(skb, 0);
 624         skb->ip_summed = CHECKSUM_UNNECESSARY;
 625         skb->pkt_type = PACKET_OTHERHOST;
 626         skb->protocol = htons(ETH_P_802_2);
 627         memset(skb->cb, 0, sizeof(skb->cb));
 628
 629         rcu_read_lock();
 630         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 631                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 632                         if (!netif_running(sdata->dev))
 633                                 continue;
 634
 635                         if (prev_dev) {
 636                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 637                                 if (skb2) {
 638                                         skb2->dev = prev_dev;
 639                                         netif_rx(skb2);
 640                                 }
 641                         }
 642
 643                         prev_dev = sdata->dev;
 644                 }
 645         }
 646         if (prev_dev) {
 647                 skb->dev = prev_dev;
 648                 netif_rx(skb);
 649                 skb = NULL;
 650         }
 651         rcu_read_unlock();
 652         dev_kfree_skb(skb);
 653 }
 654 EXPORT_SYMBOL(ieee80211_tx_status);
 655
 656 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 657                                         const struct ieee80211_ops *ops)
 658 {
 659         struct ieee80211_local *local;
 660         int priv_size;
 661         struct wiphy *wiphy;
 662
 663         /* Ensure 32-byte alignment of our private data and hw private data.
 664          * We use the wiphy priv data for both our ieee80211_local and for
 665          * the driver's private data
 666          *
 667          * In memory it'll be like this:
 668          *
 669          * +-------------------------+
 670          * | struct wiphy           |
 671          * +-------------------------+
 672          * | struct ieee80211_local  |
 673          * +-------------------------+
 674          * | driver's private data   |
 675          * +-------------------------+
 676          *
 677          */
 678         priv_size = ((sizeof(struct ieee80211_local) +
 679                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 680                     priv_data_len;
 681
 682         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 683
 684         if (!wiphy)
 685                 return NULL;
 686
 687         wiphy->privid = mac80211_wiphy_privid;
 688
 689         local = wiphy_priv(wiphy);
 690         local->hw.wiphy = wiphy;
 691
 692         local->hw.priv = (char *)local +
 693                          ((sizeof(struct ieee80211_local) +
 694                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 695
 696         BUG_ON(!ops->tx);
 697         BUG_ON(!ops->start);
 698         BUG_ON(!ops->stop);
 699         BUG_ON(!ops->config);
 700         BUG_ON(!ops->add_interface);
 701         BUG_ON(!ops->remove_interface);
 702         BUG_ON(!ops->configure_filter);
 703         local->ops = ops;
 704
 705         /* set up some defaults */
 706         local->hw.queues = 1;
 707         local->hw.max_rates = 1;
 708         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 709         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 710         local->hw.conf.long_frame_max_tx_count = 4;
 711         local->hw.conf.short_frame_max_tx_count = 7;
 712         local->hw.conf.radio_enabled = true;
 713
 714         INIT_LIST_HEAD(&local->interfaces);
 715
 716         spin_lock_init(&local->key_lock);
 717
 718         spin_lock_init(&local->queue_stop_reason_lock);
 719
 720         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 721
 722         INIT_WORK(&local->dynamic_ps_enable_work,
 723                   ieee80211_dynamic_ps_enable_work);
 724         INIT_WORK(&local->dynamic_ps_disable_work,
 725                   ieee80211_dynamic_ps_disable_work);
 726         setup_timer(&local->dynamic_ps_timer,
 727                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 728
 729         sta_info_init(local);
 730
 731         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 732                      (unsigned long)local);
 733         tasklet_disable(&local->tx_pending_tasklet);
 734
 735         tasklet_init(&local->tasklet,
 736                      ieee80211_tasklet_handler,
 737                      (unsigned long) local);
 738         tasklet_disable(&local->tasklet);
 739
 740         skb_queue_head_init(&local->skb_queue);
 741         skb_queue_head_init(&local->skb_queue_unreliable);
 742
 743         return local_to_hw(local);
 744 }
 745 EXPORT_SYMBOL(ieee80211_alloc_hw);
 746
 747 int ieee80211_register_hw(struct ieee80211_hw *hw)
 748 {
 749         struct ieee80211_local *local = hw_to_local(hw);
 750         int result;
 751         enum ieee80211_band band;
 752         struct net_device *mdev;
 753         struct ieee80211_master_priv *mpriv;
 754
 755         /*
 756          * generic code guarantees at least one band,
 757          * set this very early because much code assumes
 758          * that hw.conf.channel is assigned
 759          */
 760         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 761                 struct ieee80211_supported_band *sband;
 762
 763                 sband = local->hw.wiphy->bands[band];
 764                 if (sband) {
 765                         /* init channel we're on */
 766                         local->hw.conf.channel =
 767                         local->oper_channel =
 768                         local->scan_channel = &sband->channels[0];
 769                         break;
 770                 }
 771         }
 772
 773         /* if low-level driver supports AP, we also support VLAN */
 774         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 775                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 776
 777         /* mac80211 always supports monitor */
 778         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 779
 780         result = wiphy_register(local->hw.wiphy);
 781         if (result < 0)
 782                 return result;
 783
 784         /*
 785          * We use the number of queues for feature tests (QoS, HT) internally
 786          * so restrict them appropriately.
 787          */
 788         if (hw->queues > IEEE80211_MAX_QUEUES)
 789                 hw->queues = IEEE80211_MAX_QUEUES;
 790         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 791                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 792         if (hw->queues < 4)
 793                 hw->ampdu_queues = 0;
 794
 795         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 796                                "wmaster%d", ether_setup,
 797                                ieee80211_num_queues(hw));
 798         if (!mdev)
 799                 goto fail_mdev_alloc;
 800
 801         mpriv = netdev_priv(mdev);
 802         mpriv->local = local;
 803         local->mdev = mdev;
 804
 805         ieee80211_rx_bss_list_init(local);
 806
 807         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 808         mdev->open = ieee80211_master_open;
 809         mdev->stop = ieee80211_master_stop;
 810         mdev->type = ARPHRD_IEEE80211;
 811         mdev->header_ops = &ieee80211_header_ops;
 812         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 813
 814         local->hw.workqueue =
 815                 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
 816         if (!local->hw.workqueue) {
 817                 result = -ENOMEM;
 818                 goto fail_workqueue;
 819         }
 820
 821         /*
 822          * The hardware needs headroom for sending the frame,
 823          * and we need some headroom for passing the frame to monitor
 824          * interfaces, but never both at the same time.
 825          */
 826         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 827                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 828
 829         debugfs_hw_add(local);
 830
 831         if (local->hw.conf.beacon_int < 10)
 832                 local->hw.conf.beacon_int = 100;
 833
 834         if (local->hw.max_listen_interval == 0)
 835                 local->hw.max_listen_interval = 1;
 836
 837         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 838
 839         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 840                                                   IEEE80211_HW_SIGNAL_DB |
 841                                                   IEEE80211_HW_SIGNAL_DBM) ?
 842                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 843         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 844                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 845         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 846                 local->wstats_flags |= IW_QUAL_DBM;
 847
 848         result = sta_info_start(local);
 849         if (result < 0)
 850                 goto fail_sta_info;
 851
 852         rtnl_lock();
 853         result = dev_alloc_name(local->mdev, local->mdev->name);
 854         if (result < 0)
 855                 goto fail_dev;
 856
 857         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 858         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 859
 860         result = register_netdevice(local->mdev);
 861         if (result < 0)
 862                 goto fail_dev;
 863
 864         result = ieee80211_init_rate_ctrl_alg(local,
 865                                               hw->rate_control_algorithm);
 866         if (result < 0) {
 867                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 868                        "algorithm\n", wiphy_name(local->hw.wiphy));
 869                 goto fail_rate;
 870         }
 871
 872         result = ieee80211_wep_init(local);
 873
 874         if (result < 0) {
 875                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 876                        wiphy_name(local->hw.wiphy), result);
 877                 goto fail_wep;
 878         }
 879
 880         local->mdev->select_queue = ieee80211_select_queue;
 881
 882         /* add one default STA interface if supported */
 883         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 884                 result = ieee80211_if_add(local, "wlan%d", NULL,
 885                                           NL80211_IFTYPE_STATION, NULL);
 886                 if (result)
 887                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 888                                wiphy_name(local->hw.wiphy));
 889         }
 890
 891         rtnl_unlock();
 892
 893         ieee80211_led_init(local);
 894
 895         return 0;
 896
 897 fail_wep:
 898         rate_control_deinitialize(local);
 899 fail_rate:
 900         unregister_netdevice(local->mdev);
 901         local->mdev = NULL;
 902 fail_dev:
 903         rtnl_unlock();
 904         sta_info_stop(local);
 905 fail_sta_info:
 906         debugfs_hw_del(local);
 907         destroy_workqueue(local->hw.workqueue);
 908 fail_workqueue:
 909         if (local->mdev)
 910                 free_netdev(local->mdev);
 911 fail_mdev_alloc:
 912         wiphy_unregister(local->hw.wiphy);
 913         return result;
 914 }
 915 EXPORT_SYMBOL(ieee80211_register_hw);
 916
 917 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 918 {
 919         struct ieee80211_local *local = hw_to_local(hw);
 920
 921         tasklet_kill(&local->tx_pending_tasklet);
 922         tasklet_kill(&local->tasklet);
 923
 924         rtnl_lock();
 925
 926         /*
 927          * At this point, interface list manipulations are fine
 928          * because the driver cannot be handing us frames any
 929          * more and the tasklet is killed.
 930          */
 931
 932         /* First, we remove all virtual interfaces. */
 933         ieee80211_remove_interfaces(local);
 934
 935         /* then, finally, remove the master interface */
 936         unregister_netdevice(local->mdev);
 937
 938         rtnl_unlock();
 939
 940         ieee80211_rx_bss_list_deinit(local);
 941         ieee80211_clear_tx_pending(local);
 942         sta_info_stop(local);
 943         rate_control_deinitialize(local);
 944         debugfs_hw_del(local);
 945
 946         if (skb_queue_len(&local->skb_queue)
 947                         || skb_queue_len(&local->skb_queue_unreliable))
 948                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 949                        wiphy_name(local->hw.wiphy));
 950         skb_queue_purge(&local->skb_queue);
 951         skb_queue_purge(&local->skb_queue_unreliable);
 952
 953         destroy_workqueue(local->hw.workqueue);
 954         wiphy_unregister(local->hw.wiphy);
 955         ieee80211_wep_free(local);
 956         ieee80211_led_exit(local);
 957         free_netdev(local->mdev);
 958 }
 959 EXPORT_SYMBOL(ieee80211_unregister_hw);
 960
 961 void ieee80211_free_hw(struct ieee80211_hw *hw)
 962 {
 963         struct ieee80211_local *local = hw_to_local(hw);
 964
 965         wiphy_free(local->hw.wiphy);
 966 }
 967 EXPORT_SYMBOL(ieee80211_free_hw);
 968
 969 static int __init ieee80211_init(void)
 970 {
 971         struct sk_buff *skb;
 972         int ret;
 973
 974         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 975         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 976                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 977
 978         ret = rc80211_minstrel_init();
 979         if (ret)
 980                 return ret;
 981
 982         ret = rc80211_pid_init();
 983         if (ret)
 984                 return ret;
 985
 986         ieee80211_debugfs_netdev_init();
 987
 988         return 0;
 989 }
 990
 991 static void __exit ieee80211_exit(void)
 992 {
 993         rc80211_pid_exit();
 994         rc80211_minstrel_exit();
 995
 996         /*
 997          * For key todo, it'll be empty by now but the work
 998          * might still be scheduled.
 999          */
1000         flush_scheduled_work();
1001
1002         if (mesh_allocated)
1003                 ieee80211s_stop();
1004
1005         ieee80211_debugfs_netdev_exit();
1006 }
1007
1008
1009 subsys_initcall(ieee80211_init);
1010 module_exit(ieee80211_exit);
1011
1012 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1013 MODULE_LICENSE("GPL");