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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         __le16 tx_flags;
  45         u8 data_retries;
  46 } __attribute__ ((packed));
  47
  48
  49 /* must be called under mdev tx lock */
  50 void ieee80211_configure_filter(struct ieee80211_local *local)
  51 {
  52         unsigned int changed_flags;
  53         unsigned int new_flags = 0;
  54
  55         if (atomic_read(&local->iff_promiscs))
  56                 new_flags |= FIF_PROMISC_IN_BSS;
  57
  58         if (atomic_read(&local->iff_allmultis))
  59                 new_flags |= FIF_ALLMULTI;
  60
  61         if (local->monitors)
  62                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  63
  64         if (local->fif_fcsfail)
  65                 new_flags |= FIF_FCSFAIL;
  66
  67         if (local->fif_plcpfail)
  68                 new_flags |= FIF_PLCPFAIL;
  69
  70         if (local->fif_control)
  71                 new_flags |= FIF_CONTROL;
  72
  73         if (local->fif_other_bss)
  74                 new_flags |= FIF_OTHER_BSS;
  75
  76         changed_flags = local->filter_flags ^ new_flags;
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         local->ops->configure_filter(local_to_hw(local),
  82                                      changed_flags, &new_flags,
  83                                      local->mdev->mc_count,
  84                                      local->mdev->mc_list);
  85
  86         WARN_ON(new_flags & (1<<31));
  87
  88         local->filter_flags = new_flags & ~(1<<31);
  89 }
  90
  91 /* master interface */
  92
  93 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  94 {
  95         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  96         return ETH_ALEN;
  97 }
  98
  99 static const struct header_ops ieee80211_header_ops = {
 100         .create         = eth_header,
 101         .parse          = header_parse_80211,
 102         .rebuild        = eth_rebuild_header,
 103         .cache          = eth_header_cache,
 104         .cache_update   = eth_header_cache_update,
 105 };
 106
 107 static int ieee80211_master_open(struct net_device *dev)
 108 {
 109         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 110         struct ieee80211_local *local = mpriv->local;
 111         struct ieee80211_sub_if_data *sdata;
 112         int res = -EOPNOTSUPP;
 113
 114         /* we hold the RTNL here so can safely walk the list */
 115         list_for_each_entry(sdata, &local->interfaces, list) {
 116                 if (netif_running(sdata->dev)) {
 117                         res = 0;
 118                         break;
 119                 }
 120         }
 121
 122         if (res)
 123                 return res;
 124
 125         netif_tx_start_all_queues(local->mdev);
 126
 127         return 0;
 128 }
 129
 130 static int ieee80211_master_stop(struct net_device *dev)
 131 {
 132         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 133         struct ieee80211_local *local = mpriv->local;
 134         struct ieee80211_sub_if_data *sdata;
 135
 136         /* we hold the RTNL here so can safely walk the list */
 137         list_for_each_entry(sdata, &local->interfaces, list)
 138                 if (netif_running(sdata->dev))
 139                         dev_close(sdata->dev);
 140
 141         return 0;
 142 }
 143
 144 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 145 {
 146         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 147         struct ieee80211_local *local = mpriv->local;
 148
 149         ieee80211_configure_filter(local);
 150 }
 151
 152 /* everything else */
 153
 154 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 155 {
 156         struct ieee80211_local *local = sdata->local;
 157         struct ieee80211_if_conf conf;
 158
 159         if (WARN_ON(!netif_running(sdata->dev)))
 160                 return 0;
 161
 162         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 163                 return -EINVAL;
 164
 165         if (!local->ops->config_interface)
 166                 return 0;
 167
 168         memset(&conf, 0, sizeof(conf));
 169         conf.changed = changed;
 170
 171         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 172             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 173                 conf.bssid = sdata->u.sta.bssid;
 174                 conf.ssid = sdata->u.sta.ssid;
 175                 conf.ssid_len = sdata->u.sta.ssid_len;
 176         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 177                 conf.bssid = sdata->dev->dev_addr;
 178                 conf.ssid = sdata->u.ap.ssid;
 179                 conf.ssid_len = sdata->u.ap.ssid_len;
 180         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 181                 u8 zero[ETH_ALEN] = { 0 };
 182                 conf.bssid = zero;
 183                 conf.ssid = zero;
 184                 conf.ssid_len = 0;
 185         } else {
 186                 WARN_ON(1);
 187                 return -EINVAL;
 188         }
 189
 190         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 191                 return -EINVAL;
 192
 193         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 194                 return -EINVAL;
 195
 196         return local->ops->config_interface(local_to_hw(local),
 197                                             &sdata->vif, &conf);
 198 }
 199
 200 int ieee80211_hw_config(struct ieee80211_local *local)
 201 {
 202         struct ieee80211_channel *chan;
 203         int ret = 0;
 204
 205         if (local->sw_scanning)
 206                 chan = local->scan_channel;
 207         else
 208                 chan = local->oper_channel;
 209
 210         local->hw.conf.channel = chan;
 211
 212         if (!local->hw.conf.power_level)
 213                 local->hw.conf.power_level = chan->max_power;
 214         else
 215                 local->hw.conf.power_level = min(chan->max_power,
 216                                                local->hw.conf.power_level);
 217
 218 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 219         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 220                wiphy_name(local->hw.wiphy), chan->center_freq);
 221 #endif
 222
 223         if (local->open_count) {
 224                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 225                 /*
 226                  * HW reconfiguration should never fail, the driver has told
 227                  * us what it can support so it should live up to that promise.
 228                  */
 229                 WARN_ON(ret);
 230         }
 231
 232         return ret;
 233 }
 234
 235 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 236                                       u32 changed)
 237 {
 238         struct ieee80211_local *local = sdata->local;
 239
 240         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 241                 return;
 242
 243         if (!changed)
 244                 return;
 245
 246         if (local->ops->bss_info_changed)
 247                 local->ops->bss_info_changed(local_to_hw(local),
 248                                              &sdata->vif,
 249                                              &sdata->bss_conf,
 250                                              changed);
 251 }
 252
 253 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 254 {
 255         sdata->bss_conf.use_cts_prot = false;
 256         sdata->bss_conf.use_short_preamble = false;
 257         sdata->bss_conf.use_short_slot = false;
 258         return BSS_CHANGED_ERP_CTS_PROT |
 259                BSS_CHANGED_ERP_PREAMBLE |
 260                BSS_CHANGED_ERP_SLOT;
 261 }
 262
 263 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 264                                  struct sk_buff *skb)
 265 {
 266         struct ieee80211_local *local = hw_to_local(hw);
 267         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 268         int tmp;
 269
 270         skb->dev = local->mdev;
 271         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 272         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 273                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 274         tmp = skb_queue_len(&local->skb_queue) +
 275                 skb_queue_len(&local->skb_queue_unreliable);
 276         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 277                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 278                 dev_kfree_skb_irq(skb);
 279                 tmp--;
 280                 I802_DEBUG_INC(local->tx_status_drop);
 281         }
 282         tasklet_schedule(&local->tasklet);
 283 }
 284 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 285
 286 static void ieee80211_tasklet_handler(unsigned long data)
 287 {
 288         struct ieee80211_local *local = (struct ieee80211_local *) data;
 289         struct sk_buff *skb;
 290         struct ieee80211_rx_status rx_status;
 291         struct ieee80211_ra_tid *ra_tid;
 292
 293         while ((skb = skb_dequeue(&local->skb_queue)) ||
 294                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 295                 switch (skb->pkt_type) {
 296                 case IEEE80211_RX_MSG:
 297                         /* status is in skb->cb */
 298                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 299                         /* Clear skb->pkt_type in order to not confuse kernel
 300                          * netstack. */
 301                         skb->pkt_type = 0;
 302                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 303                         break;
 304                 case IEEE80211_TX_STATUS_MSG:
 305                         skb->pkt_type = 0;
 306                         ieee80211_tx_status(local_to_hw(local), skb);
 307                         break;
 308                 case IEEE80211_DELBA_MSG:
 309                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 310                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 311                                                 ra_tid->ra, ra_tid->tid);
 312                         dev_kfree_skb(skb);
 313                         break;
 314                 case IEEE80211_ADDBA_MSG:
 315                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 316                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 317                                                  ra_tid->ra, ra_tid->tid);
 318                         dev_kfree_skb(skb);
 319                         break ;
 320                 default:
 321                         WARN_ON(1);
 322                         dev_kfree_skb(skb);
 323                         break;
 324                 }
 325         }
 326 }
 327
 328 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 329  * make a prepared TX frame (one that has been given to hw) to look like brand
 330  * new IEEE 802.11 frame that is ready to go through TX processing again.
 331  */
 332 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 333                                       struct ieee80211_key *key,
 334                                       struct sk_buff *skb)
 335 {
 336         unsigned int hdrlen, iv_len, mic_len;
 337         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 338
 339         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 340
 341         if (!key)
 342                 goto no_key;
 343
 344         switch (key->conf.alg) {
 345         case ALG_WEP:
 346                 iv_len = WEP_IV_LEN;
 347                 mic_len = WEP_ICV_LEN;
 348                 break;
 349         case ALG_TKIP:
 350                 iv_len = TKIP_IV_LEN;
 351                 mic_len = TKIP_ICV_LEN;
 352                 break;
 353         case ALG_CCMP:
 354                 iv_len = CCMP_HDR_LEN;
 355                 mic_len = CCMP_MIC_LEN;
 356                 break;
 357         default:
 358                 goto no_key;
 359         }
 360
 361         if (skb->len >= hdrlen + mic_len &&
 362             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 363                 skb_trim(skb, skb->len - mic_len);
 364         if (skb->len >= hdrlen + iv_len) {
 365                 memmove(skb->data + iv_len, skb->data, hdrlen);
 366                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 367         }
 368
 369 no_key:
 370         if (ieee80211_is_data_qos(hdr->frame_control)) {
 371                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 372                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 373                         hdrlen - IEEE80211_QOS_CTL_LEN);
 374                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 375         }
 376 }
 377
 378 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 379                                             struct sta_info *sta,
 380                                             struct sk_buff *skb)
 381 {
 382         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 383
 384         sta->tx_filtered_count++;
 385
 386         /*
 387          * Clear the TX filter mask for this STA when sending the next
 388          * packet. If the STA went to power save mode, this will happen
 389          * when it wakes up for the next time.
 390          */
 391         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 392
 393         /*
 394          * This code races in the following way:
 395          *
 396          *  (1) STA sends frame indicating it will go to sleep and does so
 397          *  (2) hardware/firmware adds STA to filter list, passes frame up
 398          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 399          *  (4) we get TX status before having processed the frame and
 400          *      knowing that the STA has gone to sleep.
 401          *
 402          * This is actually quite unlikely even when both those events are
 403          * processed from interrupts coming in quickly after one another or
 404          * even at the same time because we queue both TX status events and
 405          * RX frames to be processed by a tasklet and process them in the
 406          * same order that they were received or TX status last. Hence, there
 407          * is no race as long as the frame RX is processed before the next TX
 408          * status, which drivers can ensure, see below.
 409          *
 410          * Note that this can only happen if the hardware or firmware can
 411          * actually add STAs to the filter list, if this is done by the
 412          * driver in response to set_tim() (which will only reduce the race
 413          * this whole filtering tries to solve, not completely solve it)
 414          * this situation cannot happen.
 415          *
 416          * To completely solve this race drivers need to make sure that they
 417          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 418          *      functions and
 419          *  (b) always process RX events before TX status events if ordering
 420          *      can be unknown, for example with different interrupt status
 421          *      bits.
 422          */
 423         if (test_sta_flags(sta, WLAN_STA_PS) &&
 424             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 425                 ieee80211_remove_tx_extra(local, sta->key, skb);
 426                 skb_queue_tail(&sta->tx_filtered, skb);
 427                 return;
 428         }
 429
 430         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 431             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
 432                 /* Software retry the packet once */
 433                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 434                 ieee80211_remove_tx_extra(local, sta->key, skb);
 435                 dev_queue_xmit(skb);
 436                 return;
 437         }
 438
 439 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 440         if (net_ratelimit())
 441                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 442                        "queue_len=%d PS=%d @%lu\n",
 443                        wiphy_name(local->hw.wiphy),
 444                        skb_queue_len(&sta->tx_filtered),
 445                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 446 #endif
 447         dev_kfree_skb(skb);
 448 }
 449
 450 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 451 {
 452         struct sk_buff *skb2;
 453         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 454         struct ieee80211_local *local = hw_to_local(hw);
 455         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 456         u16 frag, type;
 457         __le16 fc;
 458         struct ieee80211_supported_band *sband;
 459         struct ieee80211_tx_status_rtap_hdr *rthdr;
 460         struct ieee80211_sub_if_data *sdata;
 461         struct net_device *prev_dev = NULL;
 462         struct sta_info *sta;
 463
 464         rcu_read_lock();
 465
 466         sta = sta_info_get(local, hdr->addr1);
 467
 468         if (sta) {
 469                 if (info->status.excessive_retries &&
 470                     test_sta_flags(sta, WLAN_STA_PS)) {
 471                         /*
 472                          * The STA is in power save mode, so assume
 473                          * that this TX packet failed because of that.
 474                          */
 475                         ieee80211_handle_filtered_frame(local, sta, skb);
 476                         rcu_read_unlock();
 477                         return;
 478                 }
 479
 480                 fc = hdr->frame_control;
 481
 482                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 483                     (ieee80211_is_data_qos(fc))) {
 484                         u16 tid, ssn;
 485                         u8 *qc;
 486
 487                         qc = ieee80211_get_qos_ctl(hdr);
 488                         tid = qc[0] & 0xf;
 489                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 490                                                 & IEEE80211_SCTL_SEQ);
 491                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 492                                            tid, ssn);
 493                 }
 494
 495                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 496                         ieee80211_handle_filtered_frame(local, sta, skb);
 497                         rcu_read_unlock();
 498                         return;
 499                 } else {
 500                         if (info->status.excessive_retries)
 501                                 sta->tx_retry_failed++;
 502                         sta->tx_retry_count += info->status.retry_count;
 503                 }
 504
 505                 sband = local->hw.wiphy->bands[info->band];
 506                 rate_control_tx_status(local, sband, sta, skb);
 507         }
 508
 509         rcu_read_unlock();
 510
 511         ieee80211_led_tx(local, 0);
 512
 513         /* SNMP counters
 514          * Fragments are passed to low-level drivers as separate skbs, so these
 515          * are actually fragments, not frames. Update frame counters only for
 516          * the first fragment of the frame. */
 517
 518         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 519         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 520
 521         if (info->flags & IEEE80211_TX_STAT_ACK) {
 522                 if (frag == 0) {
 523                         local->dot11TransmittedFrameCount++;
 524                         if (is_multicast_ether_addr(hdr->addr1))
 525                                 local->dot11MulticastTransmittedFrameCount++;
 526                         if (info->status.retry_count > 0)
 527                                 local->dot11RetryCount++;
 528                         if (info->status.retry_count > 1)
 529                                 local->dot11MultipleRetryCount++;
 530                 }
 531
 532                 /* This counter shall be incremented for an acknowledged MPDU
 533                  * with an individual address in the address 1 field or an MPDU
 534                  * with a multicast address in the address 1 field of type Data
 535                  * or Management. */
 536                 if (!is_multicast_ether_addr(hdr->addr1) ||
 537                     type == IEEE80211_FTYPE_DATA ||
 538                     type == IEEE80211_FTYPE_MGMT)
 539                         local->dot11TransmittedFragmentCount++;
 540         } else {
 541                 if (frag == 0)
 542                         local->dot11FailedCount++;
 543         }
 544
 545         /* this was a transmitted frame, but now we want to reuse it */
 546         skb_orphan(skb);
 547
 548         /*
 549          * This is a bit racy but we can avoid a lot of work
 550          * with this test...
 551          */
 552         if (!local->monitors && !local->cooked_mntrs) {
 553                 dev_kfree_skb(skb);
 554                 return;
 555         }
 556
 557         /* send frame to monitor interfaces now */
 558
 559         if (skb_headroom(skb) < sizeof(*rthdr)) {
 560                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 561                 dev_kfree_skb(skb);
 562                 return;
 563         }
 564
 565         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 566                                 skb_push(skb, sizeof(*rthdr));
 567
 568         memset(rthdr, 0, sizeof(*rthdr));
 569         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 570         rthdr->hdr.it_present =
 571                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 572                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 573
 574         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 575             !is_multicast_ether_addr(hdr->addr1))
 576                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 577
 578         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
 579             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
 580                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 581         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
 582                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 583
 584         rthdr->data_retries = info->status.retry_count;
 585
 586         /* XXX: is this sufficient for BPF? */
 587         skb_set_mac_header(skb, 0);
 588         skb->ip_summed = CHECKSUM_UNNECESSARY;
 589         skb->pkt_type = PACKET_OTHERHOST;
 590         skb->protocol = htons(ETH_P_802_2);
 591         memset(skb->cb, 0, sizeof(skb->cb));
 592
 593         rcu_read_lock();
 594         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 595                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 596                         if (!netif_running(sdata->dev))
 597                                 continue;
 598
 599                         if (prev_dev) {
 600                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 601                                 if (skb2) {
 602                                         skb2->dev = prev_dev;
 603                                         netif_rx(skb2);
 604                                 }
 605                         }
 606
 607                         prev_dev = sdata->dev;
 608                 }
 609         }
 610         if (prev_dev) {
 611                 skb->dev = prev_dev;
 612                 netif_rx(skb);
 613                 skb = NULL;
 614         }
 615         rcu_read_unlock();
 616         dev_kfree_skb(skb);
 617 }
 618 EXPORT_SYMBOL(ieee80211_tx_status);
 619
 620 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 621                                         const struct ieee80211_ops *ops)
 622 {
 623         struct ieee80211_local *local;
 624         int priv_size;
 625         struct wiphy *wiphy;
 626
 627         /* Ensure 32-byte alignment of our private data and hw private data.
 628          * We use the wiphy priv data for both our ieee80211_local and for
 629          * the driver's private data
 630          *
 631          * In memory it'll be like this:
 632          *
 633          * +-------------------------+
 634          * | struct wiphy           |
 635          * +-------------------------+
 636          * | struct ieee80211_local  |
 637          * +-------------------------+
 638          * | driver's private data   |
 639          * +-------------------------+
 640          *
 641          */
 642         priv_size = ((sizeof(struct ieee80211_local) +
 643                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 644                     priv_data_len;
 645
 646         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 647
 648         if (!wiphy)
 649                 return NULL;
 650
 651         wiphy->privid = mac80211_wiphy_privid;
 652
 653         local = wiphy_priv(wiphy);
 654         local->hw.wiphy = wiphy;
 655
 656         local->hw.priv = (char *)local +
 657                          ((sizeof(struct ieee80211_local) +
 658                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 659
 660         BUG_ON(!ops->tx);
 661         BUG_ON(!ops->start);
 662         BUG_ON(!ops->stop);
 663         BUG_ON(!ops->config);
 664         BUG_ON(!ops->add_interface);
 665         BUG_ON(!ops->remove_interface);
 666         BUG_ON(!ops->configure_filter);
 667         local->ops = ops;
 668
 669         local->hw.queues = 1; /* default */
 670
 671         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 672         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 673         local->short_retry_limit = 7;
 674         local->long_retry_limit = 4;
 675         local->hw.conf.radio_enabled = 1;
 676
 677         INIT_LIST_HEAD(&local->interfaces);
 678
 679         spin_lock_init(&local->key_lock);
 680
 681         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 682
 683         sta_info_init(local);
 684
 685         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 686                      (unsigned long)local);
 687         tasklet_disable(&local->tx_pending_tasklet);
 688
 689         tasklet_init(&local->tasklet,
 690                      ieee80211_tasklet_handler,
 691                      (unsigned long) local);
 692         tasklet_disable(&local->tasklet);
 693
 694         skb_queue_head_init(&local->skb_queue);
 695         skb_queue_head_init(&local->skb_queue_unreliable);
 696
 697         return local_to_hw(local);
 698 }
 699 EXPORT_SYMBOL(ieee80211_alloc_hw);
 700
 701 int ieee80211_register_hw(struct ieee80211_hw *hw)
 702 {
 703         struct ieee80211_local *local = hw_to_local(hw);
 704         const char *name;
 705         int result;
 706         enum ieee80211_band band;
 707         struct net_device *mdev;
 708         struct ieee80211_master_priv *mpriv;
 709
 710         /*
 711          * generic code guarantees at least one band,
 712          * set this very early because much code assumes
 713          * that hw.conf.channel is assigned
 714          */
 715         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 716                 struct ieee80211_supported_band *sband;
 717
 718                 sband = local->hw.wiphy->bands[band];
 719                 if (sband) {
 720                         /* init channel we're on */
 721                         local->hw.conf.channel =
 722                         local->oper_channel =
 723                         local->scan_channel = &sband->channels[0];
 724                         break;
 725                 }
 726         }
 727
 728         /* if low-level driver supports AP, we also support VLAN */
 729         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 730                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 731
 732         /* mac80211 always supports monitor */
 733         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 734
 735         result = wiphy_register(local->hw.wiphy);
 736         if (result < 0)
 737                 return result;
 738
 739         /*
 740          * We use the number of queues for feature tests (QoS, HT) internally
 741          * so restrict them appropriately.
 742          */
 743         if (hw->queues > IEEE80211_MAX_QUEUES)
 744                 hw->queues = IEEE80211_MAX_QUEUES;
 745         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 746                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 747         if (hw->queues < 4)
 748                 hw->ampdu_queues = 0;
 749
 750         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 751                                "wmaster%d", ether_setup,
 752                                ieee80211_num_queues(hw));
 753         if (!mdev)
 754                 goto fail_mdev_alloc;
 755
 756         mpriv = netdev_priv(mdev);
 757         mpriv->local = local;
 758         local->mdev = mdev;
 759
 760         ieee80211_rx_bss_list_init(local);
 761
 762         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 763         mdev->open = ieee80211_master_open;
 764         mdev->stop = ieee80211_master_stop;
 765         mdev->type = ARPHRD_IEEE80211;
 766         mdev->header_ops = &ieee80211_header_ops;
 767         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 768
 769         name = wiphy_dev(local->hw.wiphy)->driver->name;
 770         local->hw.workqueue = create_freezeable_workqueue(name);
 771         if (!local->hw.workqueue) {
 772                 result = -ENOMEM;
 773                 goto fail_workqueue;
 774         }
 775
 776         /*
 777          * The hardware needs headroom for sending the frame,
 778          * and we need some headroom for passing the frame to monitor
 779          * interfaces, but never both at the same time.
 780          */
 781         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 782                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 783
 784         debugfs_hw_add(local);
 785
 786         if (local->hw.conf.beacon_int < 10)
 787                 local->hw.conf.beacon_int = 100;
 788
 789         if (local->hw.max_listen_interval == 0)
 790                 local->hw.max_listen_interval = 1;
 791
 792         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 793
 794         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 795                                                   IEEE80211_HW_SIGNAL_DB |
 796                                                   IEEE80211_HW_SIGNAL_DBM) ?
 797                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 798         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 799                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 800         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 801                 local->wstats_flags |= IW_QUAL_DBM;
 802
 803         result = sta_info_start(local);
 804         if (result < 0)
 805                 goto fail_sta_info;
 806
 807         rtnl_lock();
 808         result = dev_alloc_name(local->mdev, local->mdev->name);
 809         if (result < 0)
 810                 goto fail_dev;
 811
 812         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 813         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 814
 815         result = register_netdevice(local->mdev);
 816         if (result < 0)
 817                 goto fail_dev;
 818
 819         result = ieee80211_init_rate_ctrl_alg(local,
 820                                               hw->rate_control_algorithm);
 821         if (result < 0) {
 822                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 823                        "algorithm\n", wiphy_name(local->hw.wiphy));
 824                 goto fail_rate;
 825         }
 826
 827         result = ieee80211_wep_init(local);
 828
 829         if (result < 0) {
 830                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 831                        wiphy_name(local->hw.wiphy), result);
 832                 goto fail_wep;
 833         }
 834
 835         local->mdev->select_queue = ieee80211_select_queue;
 836
 837         /* add one default STA interface */
 838         result = ieee80211_if_add(local, "wlan%d", NULL,
 839                                   NL80211_IFTYPE_STATION, NULL);
 840         if (result)
 841                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 842                        wiphy_name(local->hw.wiphy));
 843
 844         rtnl_unlock();
 845
 846         ieee80211_led_init(local);
 847
 848         return 0;
 849
 850 fail_wep:
 851         rate_control_deinitialize(local);
 852 fail_rate:
 853         unregister_netdevice(local->mdev);
 854         local->mdev = NULL;
 855 fail_dev:
 856         rtnl_unlock();
 857         sta_info_stop(local);
 858 fail_sta_info:
 859         debugfs_hw_del(local);
 860         destroy_workqueue(local->hw.workqueue);
 861 fail_workqueue:
 862         if (local->mdev)
 863                 free_netdev(local->mdev);
 864 fail_mdev_alloc:
 865         wiphy_unregister(local->hw.wiphy);
 866         return result;
 867 }
 868 EXPORT_SYMBOL(ieee80211_register_hw);
 869
 870 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 871 {
 872         struct ieee80211_local *local = hw_to_local(hw);
 873
 874         tasklet_kill(&local->tx_pending_tasklet);
 875         tasklet_kill(&local->tasklet);
 876
 877         rtnl_lock();
 878
 879         /*
 880          * At this point, interface list manipulations are fine
 881          * because the driver cannot be handing us frames any
 882          * more and the tasklet is killed.
 883          */
 884
 885         /* First, we remove all virtual interfaces. */
 886         ieee80211_remove_interfaces(local);
 887
 888         /* then, finally, remove the master interface */
 889         unregister_netdevice(local->mdev);
 890
 891         rtnl_unlock();
 892
 893         ieee80211_rx_bss_list_deinit(local);
 894         ieee80211_clear_tx_pending(local);
 895         sta_info_stop(local);
 896         rate_control_deinitialize(local);
 897         debugfs_hw_del(local);
 898
 899         if (skb_queue_len(&local->skb_queue)
 900                         || skb_queue_len(&local->skb_queue_unreliable))
 901                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 902                        wiphy_name(local->hw.wiphy));
 903         skb_queue_purge(&local->skb_queue);
 904         skb_queue_purge(&local->skb_queue_unreliable);
 905
 906         destroy_workqueue(local->hw.workqueue);
 907         wiphy_unregister(local->hw.wiphy);
 908         ieee80211_wep_free(local);
 909         ieee80211_led_exit(local);
 910         free_netdev(local->mdev);
 911 }
 912 EXPORT_SYMBOL(ieee80211_unregister_hw);
 913
 914 void ieee80211_free_hw(struct ieee80211_hw *hw)
 915 {
 916         struct ieee80211_local *local = hw_to_local(hw);
 917
 918         wiphy_free(local->hw.wiphy);
 919 }
 920 EXPORT_SYMBOL(ieee80211_free_hw);
 921
 922 static int __init ieee80211_init(void)
 923 {
 924         struct sk_buff *skb;
 925         int ret;
 926
 927         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 928         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 929                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 930
 931         ret = rc80211_minstrel_init();
 932         if (ret)
 933                 return ret;
 934
 935         ret = rc80211_pid_init();
 936         if (ret)
 937                 return ret;
 938
 939         ieee80211_debugfs_netdev_init();
 940
 941         return 0;
 942 }
 943
 944 static void __exit ieee80211_exit(void)
 945 {
 946         rc80211_pid_exit();
 947         rc80211_minstrel_exit();
 948
 949         /*
 950          * For key todo, it'll be empty by now but the work
 951          * might still be scheduled.
 952          */
 953         flush_scheduled_work();
 954
 955         if (mesh_allocated)
 956                 ieee80211s_stop();
 957
 958         ieee80211_debugfs_netdev_exit();
 959 }
 960
 961
 962 subsys_initcall(ieee80211_init);
 963 module_exit(ieee80211_exit);
 964
 965 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 966 MODULE_LICENSE("GPL");