net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         u8 rate;
  45         u8 padding_for_rate;
  46         __le16 tx_flags;
  47         u8 data_retries;
  48 } __attribute__ ((packed));
  49
  50
  51 /* must be called under mdev tx lock */
  52 void ieee80211_configure_filter(struct ieee80211_local *local)
  53 {
  54         unsigned int changed_flags;
  55         unsigned int new_flags = 0;
  56
  57         if (atomic_read(&local->iff_promiscs))
  58                 new_flags |= FIF_PROMISC_IN_BSS;
  59
  60         if (atomic_read(&local->iff_allmultis))
  61                 new_flags |= FIF_ALLMULTI;
  62
  63         if (local->monitors)
  64                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  65
  66         if (local->fif_fcsfail)
  67                 new_flags |= FIF_FCSFAIL;
  68
  69         if (local->fif_plcpfail)
  70                 new_flags |= FIF_PLCPFAIL;
  71
  72         if (local->fif_control)
  73                 new_flags |= FIF_CONTROL;
  74
  75         if (local->fif_other_bss)
  76                 new_flags |= FIF_OTHER_BSS;
  77
  78         changed_flags = local->filter_flags ^ new_flags;
  79
  80         /* be a bit nasty */
  81         new_flags |= (1<<31);
  82
  83         local->ops->configure_filter(local_to_hw(local),
  84                                      changed_flags, &new_flags,
  85                                      local->mdev->mc_count,
  86                                      local->mdev->mc_list);
  87
  88         WARN_ON(new_flags & (1<<31));
  89
  90         local->filter_flags = new_flags & ~(1<<31);
  91 }
  92
  93 /* master interface */
  94
  95 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  96 {
  97         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  98         return ETH_ALEN;
  99 }
 100
 101 static const struct header_ops ieee80211_header_ops = {
 102         .create         = eth_header,
 103         .parse          = header_parse_80211,
 104         .rebuild        = eth_rebuild_header,
 105         .cache          = eth_header_cache,
 106         .cache_update   = eth_header_cache_update,
 107 };
 108
 109 static int ieee80211_master_open(struct net_device *dev)
 110 {
 111         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 112         struct ieee80211_local *local = mpriv->local;
 113         struct ieee80211_sub_if_data *sdata;
 114         int res = -EOPNOTSUPP;
 115
 116         /* we hold the RTNL here so can safely walk the list */
 117         list_for_each_entry(sdata, &local->interfaces, list) {
 118                 if (netif_running(sdata->dev)) {
 119                         res = 0;
 120                         break;
 121                 }
 122         }
 123
 124         if (res)
 125                 return res;
 126
 127         netif_tx_start_all_queues(local->mdev);
 128
 129         return 0;
 130 }
 131
 132 static int ieee80211_master_stop(struct net_device *dev)
 133 {
 134         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 135         struct ieee80211_local *local = mpriv->local;
 136         struct ieee80211_sub_if_data *sdata;
 137
 138         /* we hold the RTNL here so can safely walk the list */
 139         list_for_each_entry(sdata, &local->interfaces, list)
 140                 if (netif_running(sdata->dev))
 141                         dev_close(sdata->dev);
 142
 143         return 0;
 144 }
 145
 146 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 147 {
 148         struct ieee80211_master_priv *mpriv = netdev_priv(dev);
 149         struct ieee80211_local *local = mpriv->local;
 150
 151         ieee80211_configure_filter(local);
 152 }
 153
 154 /* everything else */
 155
 156 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 157 {
 158         struct ieee80211_local *local = sdata->local;
 159         struct ieee80211_if_conf conf;
 160
 161         if (WARN_ON(!netif_running(sdata->dev)))
 162                 return 0;
 163
 164         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 165                 return -EINVAL;
 166
 167         if (!local->ops->config_interface)
 168                 return 0;
 169
 170         memset(&conf, 0, sizeof(conf));
 171         conf.changed = changed;
 172
 173         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 174             sdata->vif.type == NL80211_IFTYPE_ADHOC)
 175                 conf.bssid = sdata->u.sta.bssid;
 176         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 177                 conf.bssid = sdata->dev->dev_addr;
 178         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 179                 u8 zero[ETH_ALEN] = { 0 };
 180                 conf.bssid = zero;
 181         } else {
 182                 WARN_ON(1);
 183                 return -EINVAL;
 184         }
 185
 186         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 187                 return -EINVAL;
 188
 189         return local->ops->config_interface(local_to_hw(local),
 190                                             &sdata->vif, &conf);
 191 }
 192
 193 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 194 {
 195         struct ieee80211_channel *chan;
 196         int ret = 0;
 197         int power;
 198         enum nl80211_sec_chan_offset sec_chan_offset;
 199
 200         might_sleep();
 201
 202         if (local->sw_scanning) {
 203                 chan = local->scan_channel;
 204                 sec_chan_offset = NL80211_SEC_CHAN_NO_HT;
 205         } else {
 206                 chan = local->oper_channel;
 207                 sec_chan_offset = local->oper_sec_chan_offset;
 208         }
 209
 210         if (chan != local->hw.conf.channel ||
 211             sec_chan_offset != local->hw.conf.ht.sec_chan_offset) {
 212                 local->hw.conf.channel = chan;
 213                 switch (sec_chan_offset) {
 214                 case NL80211_SEC_CHAN_NO_HT:
 215                         local->hw.conf.ht.enabled = false;
 216                         local->hw.conf.ht.sec_chan_offset = 0;
 217                         break;
 218                 case NL80211_SEC_CHAN_DISABLED:
 219                         local->hw.conf.ht.enabled = true;
 220                         local->hw.conf.ht.sec_chan_offset = 0;
 221                         break;
 222                 case NL80211_SEC_CHAN_BELOW:
 223                         local->hw.conf.ht.enabled = true;
 224                         local->hw.conf.ht.sec_chan_offset = -1;
 225                         break;
 226                 case NL80211_SEC_CHAN_ABOVE:
 227                         local->hw.conf.ht.enabled = true;
 228                         local->hw.conf.ht.sec_chan_offset = 1;
 229                         break;
 230                 }
 231                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 232         }
 233
 234         if (!local->hw.conf.power_level)
 235                 power = chan->max_power;
 236         else
 237                 power = min(chan->max_power, local->hw.conf.power_level);
 238         if (local->hw.conf.power_level != power) {
 239                 changed |= IEEE80211_CONF_CHANGE_POWER;
 240                 local->hw.conf.power_level = power;
 241         }
 242
 243         if (changed && local->open_count) {
 244                 ret = local->ops->config(local_to_hw(local), changed);
 245                 /*
 246                  * Goal:
 247                  * HW reconfiguration should never fail, the driver has told
 248                  * us what it can support so it should live up to that promise.
 249                  *
 250                  * Current status:
 251                  * rfkill is not integrated with mac80211 and a
 252                  * configuration command can thus fail if hardware rfkill
 253                  * is enabled
 254                  *
 255                  * FIXME: integrate rfkill with mac80211 and then add this
 256                  * WARN_ON() back
 257                  *
 258                  */
 259                 /* WARN_ON(ret); */
 260         }
 261
 262         return ret;
 263 }
 264
 265 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 266                                       u32 changed)
 267 {
 268         struct ieee80211_local *local = sdata->local;
 269
 270         if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
 271                 return;
 272
 273         if (!changed)
 274                 return;
 275
 276         if (local->ops->bss_info_changed)
 277                 local->ops->bss_info_changed(local_to_hw(local),
 278                                              &sdata->vif,
 279                                              &sdata->vif.bss_conf,
 280                                              changed);
 281 }
 282
 283 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 284 {
 285         sdata->vif.bss_conf.use_cts_prot = false;
 286         sdata->vif.bss_conf.use_short_preamble = false;
 287         sdata->vif.bss_conf.use_short_slot = false;
 288         return BSS_CHANGED_ERP_CTS_PROT |
 289                BSS_CHANGED_ERP_PREAMBLE |
 290                BSS_CHANGED_ERP_SLOT;
 291 }
 292
 293 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 294                                  struct sk_buff *skb)
 295 {
 296         struct ieee80211_local *local = hw_to_local(hw);
 297         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 298         int tmp;
 299
 300         skb->dev = local->mdev;
 301         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 302         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 303                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 304         tmp = skb_queue_len(&local->skb_queue) +
 305                 skb_queue_len(&local->skb_queue_unreliable);
 306         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 307                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 308                 dev_kfree_skb_irq(skb);
 309                 tmp--;
 310                 I802_DEBUG_INC(local->tx_status_drop);
 311         }
 312         tasklet_schedule(&local->tasklet);
 313 }
 314 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 315
 316 static void ieee80211_tasklet_handler(unsigned long data)
 317 {
 318         struct ieee80211_local *local = (struct ieee80211_local *) data;
 319         struct sk_buff *skb;
 320         struct ieee80211_rx_status rx_status;
 321         struct ieee80211_ra_tid *ra_tid;
 322
 323         while ((skb = skb_dequeue(&local->skb_queue)) ||
 324                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 325                 switch (skb->pkt_type) {
 326                 case IEEE80211_RX_MSG:
 327                         /* status is in skb->cb */
 328                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 329                         /* Clear skb->pkt_type in order to not confuse kernel
 330                          * netstack. */
 331                         skb->pkt_type = 0;
 332                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 333                         break;
 334                 case IEEE80211_TX_STATUS_MSG:
 335                         skb->pkt_type = 0;
 336                         ieee80211_tx_status(local_to_hw(local), skb);
 337                         break;
 338                 case IEEE80211_DELBA_MSG:
 339                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 340                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 341                                                 ra_tid->ra, ra_tid->tid);
 342                         dev_kfree_skb(skb);
 343                         break;
 344                 case IEEE80211_ADDBA_MSG:
 345                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 346                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 347                                                  ra_tid->ra, ra_tid->tid);
 348                         dev_kfree_skb(skb);
 349                         break ;
 350                 default:
 351                         WARN_ON(1);
 352                         dev_kfree_skb(skb);
 353                         break;
 354                 }
 355         }
 356 }
 357
 358 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 359  * make a prepared TX frame (one that has been given to hw) to look like brand
 360  * new IEEE 802.11 frame that is ready to go through TX processing again.
 361  */
 362 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 363                                       struct ieee80211_key *key,
 364                                       struct sk_buff *skb)
 365 {
 366         unsigned int hdrlen, iv_len, mic_len;
 367         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 368
 369         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 370
 371         if (!key)
 372                 goto no_key;
 373
 374         switch (key->conf.alg) {
 375         case ALG_WEP:
 376                 iv_len = WEP_IV_LEN;
 377                 mic_len = WEP_ICV_LEN;
 378                 break;
 379         case ALG_TKIP:
 380                 iv_len = TKIP_IV_LEN;
 381                 mic_len = TKIP_ICV_LEN;
 382                 break;
 383         case ALG_CCMP:
 384                 iv_len = CCMP_HDR_LEN;
 385                 mic_len = CCMP_MIC_LEN;
 386                 break;
 387         default:
 388                 goto no_key;
 389         }
 390
 391         if (skb->len >= hdrlen + mic_len &&
 392             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 393                 skb_trim(skb, skb->len - mic_len);
 394         if (skb->len >= hdrlen + iv_len) {
 395                 memmove(skb->data + iv_len, skb->data, hdrlen);
 396                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 397         }
 398
 399 no_key:
 400         if (ieee80211_is_data_qos(hdr->frame_control)) {
 401                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 402                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 403                         hdrlen - IEEE80211_QOS_CTL_LEN);
 404                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 405         }
 406 }
 407
 408 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 409                                             struct sta_info *sta,
 410                                             struct sk_buff *skb)
 411 {
 412         sta->tx_filtered_count++;
 413
 414         /*
 415          * Clear the TX filter mask for this STA when sending the next
 416          * packet. If the STA went to power save mode, this will happen
 417          * when it wakes up for the next time.
 418          */
 419         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 420
 421         /*
 422          * This code races in the following way:
 423          *
 424          *  (1) STA sends frame indicating it will go to sleep and does so
 425          *  (2) hardware/firmware adds STA to filter list, passes frame up
 426          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 427          *  (4) we get TX status before having processed the frame and
 428          *      knowing that the STA has gone to sleep.
 429          *
 430          * This is actually quite unlikely even when both those events are
 431          * processed from interrupts coming in quickly after one another or
 432          * even at the same time because we queue both TX status events and
 433          * RX frames to be processed by a tasklet and process them in the
 434          * same order that they were received or TX status last. Hence, there
 435          * is no race as long as the frame RX is processed before the next TX
 436          * status, which drivers can ensure, see below.
 437          *
 438          * Note that this can only happen if the hardware or firmware can
 439          * actually add STAs to the filter list, if this is done by the
 440          * driver in response to set_tim() (which will only reduce the race
 441          * this whole filtering tries to solve, not completely solve it)
 442          * this situation cannot happen.
 443          *
 444          * To completely solve this race drivers need to make sure that they
 445          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 446          *      functions and
 447          *  (b) always process RX events before TX status events if ordering
 448          *      can be unknown, for example with different interrupt status
 449          *      bits.
 450          */
 451         if (test_sta_flags(sta, WLAN_STA_PS) &&
 452             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 453                 ieee80211_remove_tx_extra(local, sta->key, skb);
 454                 skb_queue_tail(&sta->tx_filtered, skb);
 455                 return;
 456         }
 457
 458         if (!test_sta_flags(sta, WLAN_STA_PS) && !skb->requeue) {
 459                 /* Software retry the packet once */
 460                 skb->requeue = 1;
 461                 ieee80211_remove_tx_extra(local, sta->key, skb);
 462                 dev_queue_xmit(skb);
 463                 return;
 464         }
 465
 466 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 467         if (net_ratelimit())
 468                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 469                        "queue_len=%d PS=%d @%lu\n",
 470                        wiphy_name(local->hw.wiphy),
 471                        skb_queue_len(&sta->tx_filtered),
 472                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 473 #endif
 474         dev_kfree_skb(skb);
 475 }
 476
 477 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 478 {
 479         struct sk_buff *skb2;
 480         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 481         struct ieee80211_local *local = hw_to_local(hw);
 482         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 483         u16 frag, type;
 484         __le16 fc;
 485         struct ieee80211_supported_band *sband;
 486         struct ieee80211_tx_status_rtap_hdr *rthdr;
 487         struct ieee80211_sub_if_data *sdata;
 488         struct net_device *prev_dev = NULL;
 489         struct sta_info *sta;
 490         int retry_count = -1, i;
 491
 492         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 493                 /* the HW cannot have attempted that rate */
 494                 if (i >= hw->max_rates) {
 495                         info->status.rates[i].idx = -1;
 496                         info->status.rates[i].count = 0;
 497                 }
 498
 499                 retry_count += info->status.rates[i].count;
 500         }
 501         if (retry_count < 0)
 502                 retry_count = 0;
 503
 504         rcu_read_lock();
 505
 506         sband = local->hw.wiphy->bands[info->band];
 507
 508         sta = sta_info_get(local, hdr->addr1);
 509
 510         if (sta) {
 511                 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 512                     test_sta_flags(sta, WLAN_STA_PS)) {
 513                         /*
 514                          * The STA is in power save mode, so assume
 515                          * that this TX packet failed because of that.
 516                          */
 517                         ieee80211_handle_filtered_frame(local, sta, skb);
 518                         rcu_read_unlock();
 519                         return;
 520                 }
 521
 522                 fc = hdr->frame_control;
 523
 524                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 525                     (ieee80211_is_data_qos(fc))) {
 526                         u16 tid, ssn;
 527                         u8 *qc;
 528
 529                         qc = ieee80211_get_qos_ctl(hdr);
 530                         tid = qc[0] & 0xf;
 531                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 532                                                 & IEEE80211_SCTL_SEQ);
 533                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 534                                            tid, ssn);
 535                 }
 536
 537                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 538                         ieee80211_handle_filtered_frame(local, sta, skb);
 539                         rcu_read_unlock();
 540                         return;
 541                 } else {
 542                         if (!(info->flags & IEEE80211_TX_STAT_ACK))
 543                                 sta->tx_retry_failed++;
 544                         sta->tx_retry_count += retry_count;
 545                 }
 546
 547                 rate_control_tx_status(local, sband, sta, skb);
 548         }
 549
 550         rcu_read_unlock();
 551
 552         ieee80211_led_tx(local, 0);
 553
 554         /* SNMP counters
 555          * Fragments are passed to low-level drivers as separate skbs, so these
 556          * are actually fragments, not frames. Update frame counters only for
 557          * the first fragment of the frame. */
 558
 559         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 560         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 561
 562         if (info->flags & IEEE80211_TX_STAT_ACK) {
 563                 if (frag == 0) {
 564                         local->dot11TransmittedFrameCount++;
 565                         if (is_multicast_ether_addr(hdr->addr1))
 566                                 local->dot11MulticastTransmittedFrameCount++;
 567                         if (retry_count > 0)
 568                                 local->dot11RetryCount++;
 569                         if (retry_count > 1)
 570                                 local->dot11MultipleRetryCount++;
 571                 }
 572
 573                 /* This counter shall be incremented for an acknowledged MPDU
 574                  * with an individual address in the address 1 field or an MPDU
 575                  * with a multicast address in the address 1 field of type Data
 576                  * or Management. */
 577                 if (!is_multicast_ether_addr(hdr->addr1) ||
 578                     type == IEEE80211_FTYPE_DATA ||
 579                     type == IEEE80211_FTYPE_MGMT)
 580                         local->dot11TransmittedFragmentCount++;
 581         } else {
 582                 if (frag == 0)
 583                         local->dot11FailedCount++;
 584         }
 585
 586         /* this was a transmitted frame, but now we want to reuse it */
 587         skb_orphan(skb);
 588
 589         /*
 590          * This is a bit racy but we can avoid a lot of work
 591          * with this test...
 592          */
 593         if (!local->monitors && !local->cooked_mntrs) {
 594                 dev_kfree_skb(skb);
 595                 return;
 596         }
 597
 598         /* send frame to monitor interfaces now */
 599
 600         if (skb_headroom(skb) < sizeof(*rthdr)) {
 601                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 602                 dev_kfree_skb(skb);
 603                 return;
 604         }
 605
 606         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 607                                 skb_push(skb, sizeof(*rthdr));
 608
 609         memset(rthdr, 0, sizeof(*rthdr));
 610         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 611         rthdr->hdr.it_present =
 612                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 613                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
 614                             (1 << IEEE80211_RADIOTAP_RATE));
 615
 616         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 617             !is_multicast_ether_addr(hdr->addr1))
 618                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 619
 620         /*
 621          * XXX: Once radiotap gets the bitmap reset thing the vendor
 622          *      extensions proposal contains, we can actually report
 623          *      the whole set of tries we did.
 624          */
 625         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
 626             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
 627                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 628         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 629                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 630         if (info->status.rates[0].idx >= 0 &&
 631             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
 632                 rthdr->rate = sband->bitrates[
 633                                 info->status.rates[0].idx].bitrate / 5;
 634
 635         /* for now report the total retry_count */
 636         rthdr->data_retries = retry_count;
 637
 638         /* XXX: is this sufficient for BPF? */
 639         skb_set_mac_header(skb, 0);
 640         skb->ip_summed = CHECKSUM_UNNECESSARY;
 641         skb->pkt_type = PACKET_OTHERHOST;
 642         skb->protocol = htons(ETH_P_802_2);
 643         memset(skb->cb, 0, sizeof(skb->cb));
 644
 645         rcu_read_lock();
 646         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 647                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 648                         if (!netif_running(sdata->dev))
 649                                 continue;
 650
 651                         if (prev_dev) {
 652                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 653                                 if (skb2) {
 654                                         skb2->dev = prev_dev;
 655                                         netif_rx(skb2);
 656                                 }
 657                         }
 658
 659                         prev_dev = sdata->dev;
 660                 }
 661         }
 662         if (prev_dev) {
 663                 skb->dev = prev_dev;
 664                 netif_rx(skb);
 665                 skb = NULL;
 666         }
 667         rcu_read_unlock();
 668         dev_kfree_skb(skb);
 669 }
 670 EXPORT_SYMBOL(ieee80211_tx_status);
 671
 672 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 673                                         const struct ieee80211_ops *ops)
 674 {
 675         struct ieee80211_local *local;
 676         int priv_size;
 677         struct wiphy *wiphy;
 678
 679         /* Ensure 32-byte alignment of our private data and hw private data.
 680          * We use the wiphy priv data for both our ieee80211_local and for
 681          * the driver's private data
 682          *
 683          * In memory it'll be like this:
 684          *
 685          * +-------------------------+
 686          * | struct wiphy           |
 687          * +-------------------------+
 688          * | struct ieee80211_local  |
 689          * +-------------------------+
 690          * | driver's private data   |
 691          * +-------------------------+
 692          *
 693          */
 694         priv_size = ((sizeof(struct ieee80211_local) +
 695                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 696                     priv_data_len;
 697
 698         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 699
 700         if (!wiphy)
 701                 return NULL;
 702
 703         wiphy->privid = mac80211_wiphy_privid;
 704
 705         local = wiphy_priv(wiphy);
 706         local->hw.wiphy = wiphy;
 707
 708         local->hw.priv = (char *)local +
 709                          ((sizeof(struct ieee80211_local) +
 710                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 711
 712         BUG_ON(!ops->tx);
 713         BUG_ON(!ops->start);
 714         BUG_ON(!ops->stop);
 715         BUG_ON(!ops->config);
 716         BUG_ON(!ops->add_interface);
 717         BUG_ON(!ops->remove_interface);
 718         BUG_ON(!ops->configure_filter);
 719         local->ops = ops;
 720
 721         /* set up some defaults */
 722         local->hw.queues = 1;
 723         local->hw.max_rates = 1;
 724         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 725         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 726         local->hw.conf.long_frame_max_tx_count = 4;
 727         local->hw.conf.short_frame_max_tx_count = 7;
 728         local->hw.conf.radio_enabled = true;
 729
 730         INIT_LIST_HEAD(&local->interfaces);
 731
 732         spin_lock_init(&local->key_lock);
 733
 734         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 735
 736         sta_info_init(local);
 737
 738         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 739                      (unsigned long)local);
 740         tasklet_disable(&local->tx_pending_tasklet);
 741
 742         tasklet_init(&local->tasklet,
 743                      ieee80211_tasklet_handler,
 744                      (unsigned long) local);
 745         tasklet_disable(&local->tasklet);
 746
 747         skb_queue_head_init(&local->skb_queue);
 748         skb_queue_head_init(&local->skb_queue_unreliable);
 749
 750         return local_to_hw(local);
 751 }
 752 EXPORT_SYMBOL(ieee80211_alloc_hw);
 753
 754 int ieee80211_register_hw(struct ieee80211_hw *hw)
 755 {
 756         struct ieee80211_local *local = hw_to_local(hw);
 757         int result;
 758         enum ieee80211_band band;
 759         struct net_device *mdev;
 760         struct ieee80211_master_priv *mpriv;
 761
 762         /*
 763          * generic code guarantees at least one band,
 764          * set this very early because much code assumes
 765          * that hw.conf.channel is assigned
 766          */
 767         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 768                 struct ieee80211_supported_band *sband;
 769
 770                 sband = local->hw.wiphy->bands[band];
 771                 if (sband) {
 772                         /* init channel we're on */
 773                         local->hw.conf.channel =
 774                         local->oper_channel =
 775                         local->scan_channel = &sband->channels[0];
 776                         break;
 777                 }
 778         }
 779
 780         /* if low-level driver supports AP, we also support VLAN */
 781         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 782                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 783
 784         /* mac80211 always supports monitor */
 785         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 786
 787         result = wiphy_register(local->hw.wiphy);
 788         if (result < 0)
 789                 return result;
 790
 791         /*
 792          * We use the number of queues for feature tests (QoS, HT) internally
 793          * so restrict them appropriately.
 794          */
 795         if (hw->queues > IEEE80211_MAX_QUEUES)
 796                 hw->queues = IEEE80211_MAX_QUEUES;
 797         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 798                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 799         if (hw->queues < 4)
 800                 hw->ampdu_queues = 0;
 801
 802         mdev = alloc_netdev_mq(sizeof(struct ieee80211_master_priv),
 803                                "wmaster%d", ether_setup,
 804                                ieee80211_num_queues(hw));
 805         if (!mdev)
 806                 goto fail_mdev_alloc;
 807
 808         mpriv = netdev_priv(mdev);
 809         mpriv->local = local;
 810         local->mdev = mdev;
 811
 812         ieee80211_rx_bss_list_init(local);
 813
 814         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 815         mdev->open = ieee80211_master_open;
 816         mdev->stop = ieee80211_master_stop;
 817         mdev->type = ARPHRD_IEEE80211;
 818         mdev->header_ops = &ieee80211_header_ops;
 819         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 820
 821         local->hw.workqueue =
 822                 create_freezeable_workqueue(wiphy_name(local->hw.wiphy));
 823         if (!local->hw.workqueue) {
 824                 result = -ENOMEM;
 825                 goto fail_workqueue;
 826         }
 827
 828         /*
 829          * The hardware needs headroom for sending the frame,
 830          * and we need some headroom for passing the frame to monitor
 831          * interfaces, but never both at the same time.
 832          */
 833         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 834                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 835
 836         debugfs_hw_add(local);
 837
 838         if (local->hw.conf.beacon_int < 10)
 839                 local->hw.conf.beacon_int = 100;
 840
 841         if (local->hw.max_listen_interval == 0)
 842                 local->hw.max_listen_interval = 1;
 843
 844         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 845
 846         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 847                                                   IEEE80211_HW_SIGNAL_DB |
 848                                                   IEEE80211_HW_SIGNAL_DBM) ?
 849                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 850         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 851                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 852         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 853                 local->wstats_flags |= IW_QUAL_DBM;
 854
 855         result = sta_info_start(local);
 856         if (result < 0)
 857                 goto fail_sta_info;
 858
 859         rtnl_lock();
 860         result = dev_alloc_name(local->mdev, local->mdev->name);
 861         if (result < 0)
 862                 goto fail_dev;
 863
 864         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 865         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 866
 867         result = register_netdevice(local->mdev);
 868         if (result < 0)
 869                 goto fail_dev;
 870
 871         result = ieee80211_init_rate_ctrl_alg(local,
 872                                               hw->rate_control_algorithm);
 873         if (result < 0) {
 874                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 875                        "algorithm\n", wiphy_name(local->hw.wiphy));
 876                 goto fail_rate;
 877         }
 878
 879         result = ieee80211_wep_init(local);
 880
 881         if (result < 0) {
 882                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 883                        wiphy_name(local->hw.wiphy), result);
 884                 goto fail_wep;
 885         }
 886
 887         local->mdev->select_queue = ieee80211_select_queue;
 888
 889         /* add one default STA interface */
 890         result = ieee80211_if_add(local, "wlan%d", NULL,
 891                                   NL80211_IFTYPE_STATION, NULL);
 892         if (result)
 893                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 894                        wiphy_name(local->hw.wiphy));
 895
 896         rtnl_unlock();
 897
 898         ieee80211_led_init(local);
 899
 900         return 0;
 901
 902 fail_wep:
 903         rate_control_deinitialize(local);
 904 fail_rate:
 905         unregister_netdevice(local->mdev);
 906         local->mdev = NULL;
 907 fail_dev:
 908         rtnl_unlock();
 909         sta_info_stop(local);
 910 fail_sta_info:
 911         debugfs_hw_del(local);
 912         destroy_workqueue(local->hw.workqueue);
 913 fail_workqueue:
 914         if (local->mdev)
 915                 free_netdev(local->mdev);
 916 fail_mdev_alloc:
 917         wiphy_unregister(local->hw.wiphy);
 918         return result;
 919 }
 920 EXPORT_SYMBOL(ieee80211_register_hw);
 921
 922 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 923 {
 924         struct ieee80211_local *local = hw_to_local(hw);
 925
 926         tasklet_kill(&local->tx_pending_tasklet);
 927         tasklet_kill(&local->tasklet);
 928
 929         rtnl_lock();
 930
 931         /*
 932          * At this point, interface list manipulations are fine
 933          * because the driver cannot be handing us frames any
 934          * more and the tasklet is killed.
 935          */
 936
 937         /* First, we remove all virtual interfaces. */
 938         ieee80211_remove_interfaces(local);
 939
 940         /* then, finally, remove the master interface */
 941         unregister_netdevice(local->mdev);
 942
 943         rtnl_unlock();
 944
 945         ieee80211_rx_bss_list_deinit(local);
 946         ieee80211_clear_tx_pending(local);
 947         sta_info_stop(local);
 948         rate_control_deinitialize(local);
 949         debugfs_hw_del(local);
 950
 951         if (skb_queue_len(&local->skb_queue)
 952                         || skb_queue_len(&local->skb_queue_unreliable))
 953                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 954                        wiphy_name(local->hw.wiphy));
 955         skb_queue_purge(&local->skb_queue);
 956         skb_queue_purge(&local->skb_queue_unreliable);
 957
 958         destroy_workqueue(local->hw.workqueue);
 959         wiphy_unregister(local->hw.wiphy);
 960         ieee80211_wep_free(local);
 961         ieee80211_led_exit(local);
 962         free_netdev(local->mdev);
 963 }
 964 EXPORT_SYMBOL(ieee80211_unregister_hw);
 965
 966 void ieee80211_free_hw(struct ieee80211_hw *hw)
 967 {
 968         struct ieee80211_local *local = hw_to_local(hw);
 969
 970         wiphy_free(local->hw.wiphy);
 971 }
 972 EXPORT_SYMBOL(ieee80211_free_hw);
 973
 974 static int __init ieee80211_init(void)
 975 {
 976         struct sk_buff *skb;
 977         int ret;
 978
 979         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 980         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 981                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 982
 983         ret = rc80211_minstrel_init();
 984         if (ret)
 985                 return ret;
 986
 987         ret = rc80211_pid_init();
 988         if (ret)
 989                 return ret;
 990
 991         ieee80211_debugfs_netdev_init();
 992
 993         return 0;
 994 }
 995
 996 static void __exit ieee80211_exit(void)
 997 {
 998         rc80211_pid_exit();
 999         rc80211_minstrel_exit();
1000
1001         /*
1002          * For key todo, it'll be empty by now but the work
1003          * might still be scheduled.
1004          */
1005         flush_scheduled_work();
1006
1007         if (mesh_allocated)
1008                 ieee80211s_stop();
1009
1010         ieee80211_debugfs_netdev_exit();
1011 }
1012
1013
1014 subsys_initcall(ieee80211_init);
1015 module_exit(ieee80211_exit);
1016
1017 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1018 MODULE_LICENSE("GPL");