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         __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_local *local = wdev_priv(dev->ieee80211_ptr);
 110         struct ieee80211_sub_if_data *sdata;
 111         int res = -EOPNOTSUPP;
 112
 113         /* we hold the RTNL here so can safely walk the list */
 114         list_for_each_entry(sdata, &local->interfaces, list) {
 115                 if (netif_running(sdata->dev)) {
 116                         res = 0;
 117                         break;
 118                 }
 119         }
 120
 121         if (res)
 122                 return res;
 123
 124         netif_tx_start_all_queues(local->mdev);
 125
 126         return 0;
 127 }
 128
 129 static int ieee80211_master_stop(struct net_device *dev)
 130 {
 131         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 132         struct ieee80211_sub_if_data *sdata;
 133
 134         /* we hold the RTNL here so can safely walk the list */
 135         list_for_each_entry(sdata, &local->interfaces, list)
 136                 if (netif_running(sdata->dev))
 137                         dev_close(sdata->dev);
 138
 139         return 0;
 140 }
 141
 142 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 143 {
 144         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 145
 146         ieee80211_configure_filter(local);
 147 }
 148
 149 /* everything else */
 150
 151 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 152 {
 153         struct ieee80211_local *local = sdata->local;
 154         struct ieee80211_if_conf conf;
 155
 156         if (WARN_ON(!netif_running(sdata->dev)))
 157                 return 0;
 158
 159         if (!local->ops->config_interface)
 160                 return 0;
 161
 162         memset(&conf, 0, sizeof(conf));
 163         conf.changed = changed;
 164
 165         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 166             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 167                 conf.bssid = sdata->u.sta.bssid;
 168                 conf.ssid = sdata->u.sta.ssid;
 169                 conf.ssid_len = sdata->u.sta.ssid_len;
 170         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 171                 conf.bssid = sdata->dev->dev_addr;
 172                 conf.ssid = sdata->u.ap.ssid;
 173                 conf.ssid_len = sdata->u.ap.ssid_len;
 174         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 175                 u8 zero[ETH_ALEN] = { 0 };
 176                 conf.bssid = zero;
 177                 conf.ssid = zero;
 178                 conf.ssid_len = 0;
 179         } else {
 180                 WARN_ON(1);
 181                 return -EINVAL;
 182         }
 183
 184         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 185                 return -EINVAL;
 186
 187         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 188                 return -EINVAL;
 189
 190         return local->ops->config_interface(local_to_hw(local),
 191                                             &sdata->vif, &conf);
 192 }
 193
 194 int ieee80211_hw_config(struct ieee80211_local *local)
 195 {
 196         struct ieee80211_channel *chan;
 197         int ret = 0;
 198
 199         if (local->sw_scanning)
 200                 chan = local->scan_channel;
 201         else
 202                 chan = local->oper_channel;
 203
 204         local->hw.conf.channel = chan;
 205
 206         if (!local->hw.conf.power_level)
 207                 local->hw.conf.power_level = chan->max_power;
 208         else
 209                 local->hw.conf.power_level = min(chan->max_power,
 210                                                local->hw.conf.power_level);
 211
 212         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
 213
 214 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 215         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 216                wiphy_name(local->hw.wiphy), chan->center_freq);
 217 #endif
 218
 219         if (local->open_count)
 220                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 221
 222         return ret;
 223 }
 224
 225 /**
 226  * ieee80211_handle_ht should be used only after legacy configuration
 227  * has been determined namely band, as ht configuration depends upon
 228  * the hardware's HT abilities for a _specific_ band.
 229  */
 230 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 231                            struct ieee80211_ht_info *req_ht_cap,
 232                            struct ieee80211_ht_bss_info *req_bss_cap)
 233 {
 234         struct ieee80211_conf *conf = &local->hw.conf;
 235         struct ieee80211_supported_band *sband;
 236         struct ieee80211_ht_info ht_conf;
 237         struct ieee80211_ht_bss_info ht_bss_conf;
 238         u32 changed = 0;
 239         int i;
 240         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
 241         u8 tx_mcs_set_cap;
 242
 243         sband = local->hw.wiphy->bands[conf->channel->band];
 244
 245         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
 246         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
 247
 248         /* HT is not supported */
 249         if (!sband->ht_info.ht_supported) {
 250                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 251                 goto out;
 252         }
 253
 254         /* disable HT */
 255         if (!enable_ht) {
 256                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
 257                         changed |= BSS_CHANGED_HT;
 258                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 259                 conf->ht_conf.ht_supported = 0;
 260                 goto out;
 261         }
 262
 263
 264         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
 265                 changed |= BSS_CHANGED_HT;
 266
 267         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 268         ht_conf.ht_supported = 1;
 269
 270         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
 271         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
 272         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
 273         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
 274         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 275         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 276
 277         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 278         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 279
 280         /* Bits 96-100 */
 281         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
 282
 283         /* configure suppoerted Tx MCS according to requested MCS
 284          * (based in most cases on Rx capabilities of peer) and self
 285          * Tx MCS capabilities (as defined by low level driver HW
 286          * Tx capabilities) */
 287         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
 288                 goto check_changed;
 289
 290         /* Counting from 0 therfore + 1 */
 291         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
 292                 max_tx_streams = ((tx_mcs_set_cap &
 293                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
 294
 295         for (i = 0; i < max_tx_streams; i++)
 296                 ht_conf.supp_mcs_set[i] =
 297                         sband->ht_info.supp_mcs_set[i] &
 298                                         req_ht_cap->supp_mcs_set[i];
 299
 300         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
 301                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
 302                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
 303                         ht_conf.supp_mcs_set[i] =
 304                                 sband->ht_info.supp_mcs_set[i] &
 305                                         req_ht_cap->supp_mcs_set[i];
 306
 307 check_changed:
 308         /* if bss configuration changed store the new one */
 309         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
 310             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
 311                 changed |= BSS_CHANGED_HT;
 312                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
 313                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
 314         }
 315 out:
 316         return changed;
 317 }
 318
 319 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 320                                       u32 changed)
 321 {
 322         struct ieee80211_local *local = sdata->local;
 323
 324         if (!changed)
 325                 return;
 326
 327         if (local->ops->bss_info_changed)
 328                 local->ops->bss_info_changed(local_to_hw(local),
 329                                              &sdata->vif,
 330                                              &sdata->bss_conf,
 331                                              changed);
 332 }
 333
 334 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 335 {
 336         sdata->bss_conf.use_cts_prot = 0;
 337         sdata->bss_conf.use_short_preamble = 0;
 338         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
 339 }
 340
 341 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 342                                  struct sk_buff *skb)
 343 {
 344         struct ieee80211_local *local = hw_to_local(hw);
 345         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 346         int tmp;
 347
 348         skb->dev = local->mdev;
 349         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 350         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 351                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 352         tmp = skb_queue_len(&local->skb_queue) +
 353                 skb_queue_len(&local->skb_queue_unreliable);
 354         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 355                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 356                 dev_kfree_skb_irq(skb);
 357                 tmp--;
 358                 I802_DEBUG_INC(local->tx_status_drop);
 359         }
 360         tasklet_schedule(&local->tasklet);
 361 }
 362 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 363
 364 static void ieee80211_tasklet_handler(unsigned long data)
 365 {
 366         struct ieee80211_local *local = (struct ieee80211_local *) data;
 367         struct sk_buff *skb;
 368         struct ieee80211_rx_status rx_status;
 369         struct ieee80211_ra_tid *ra_tid;
 370
 371         while ((skb = skb_dequeue(&local->skb_queue)) ||
 372                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 373                 switch (skb->pkt_type) {
 374                 case IEEE80211_RX_MSG:
 375                         /* status is in skb->cb */
 376                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 377                         /* Clear skb->pkt_type in order to not confuse kernel
 378                          * netstack. */
 379                         skb->pkt_type = 0;
 380                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 381                         break;
 382                 case IEEE80211_TX_STATUS_MSG:
 383                         skb->pkt_type = 0;
 384                         ieee80211_tx_status(local_to_hw(local), skb);
 385                         break;
 386                 case IEEE80211_DELBA_MSG:
 387                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 388                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 389                                                 ra_tid->ra, ra_tid->tid);
 390                         dev_kfree_skb(skb);
 391                         break;
 392                 case IEEE80211_ADDBA_MSG:
 393                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 394                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 395                                                  ra_tid->ra, ra_tid->tid);
 396                         dev_kfree_skb(skb);
 397                         break ;
 398                 default:
 399                         WARN_ON(1);
 400                         dev_kfree_skb(skb);
 401                         break;
 402                 }
 403         }
 404 }
 405
 406 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 407  * make a prepared TX frame (one that has been given to hw) to look like brand
 408  * new IEEE 802.11 frame that is ready to go through TX processing again.
 409  */
 410 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 411                                       struct ieee80211_key *key,
 412                                       struct sk_buff *skb)
 413 {
 414         unsigned int hdrlen, iv_len, mic_len;
 415         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 416
 417         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 418
 419         if (!key)
 420                 goto no_key;
 421
 422         switch (key->conf.alg) {
 423         case ALG_WEP:
 424                 iv_len = WEP_IV_LEN;
 425                 mic_len = WEP_ICV_LEN;
 426                 break;
 427         case ALG_TKIP:
 428                 iv_len = TKIP_IV_LEN;
 429                 mic_len = TKIP_ICV_LEN;
 430                 break;
 431         case ALG_CCMP:
 432                 iv_len = CCMP_HDR_LEN;
 433                 mic_len = CCMP_MIC_LEN;
 434                 break;
 435         default:
 436                 goto no_key;
 437         }
 438
 439         if (skb->len >= hdrlen + mic_len &&
 440             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 441                 skb_trim(skb, skb->len - mic_len);
 442         if (skb->len >= hdrlen + iv_len) {
 443                 memmove(skb->data + iv_len, skb->data, hdrlen);
 444                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 445         }
 446
 447 no_key:
 448         if (ieee80211_is_data_qos(hdr->frame_control)) {
 449                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 450                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 451                         hdrlen - IEEE80211_QOS_CTL_LEN);
 452                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 453         }
 454 }
 455
 456 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 457                                             struct sta_info *sta,
 458                                             struct sk_buff *skb)
 459 {
 460         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 461
 462         sta->tx_filtered_count++;
 463
 464         /*
 465          * Clear the TX filter mask for this STA when sending the next
 466          * packet. If the STA went to power save mode, this will happen
 467          * when it wakes up for the next time.
 468          */
 469         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 470
 471         /*
 472          * This code races in the following way:
 473          *
 474          *  (1) STA sends frame indicating it will go to sleep and does so
 475          *  (2) hardware/firmware adds STA to filter list, passes frame up
 476          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 477          *  (4) we get TX status before having processed the frame and
 478          *      knowing that the STA has gone to sleep.
 479          *
 480          * This is actually quite unlikely even when both those events are
 481          * processed from interrupts coming in quickly after one another or
 482          * even at the same time because we queue both TX status events and
 483          * RX frames to be processed by a tasklet and process them in the
 484          * same order that they were received or TX status last. Hence, there
 485          * is no race as long as the frame RX is processed before the next TX
 486          * status, which drivers can ensure, see below.
 487          *
 488          * Note that this can only happen if the hardware or firmware can
 489          * actually add STAs to the filter list, if this is done by the
 490          * driver in response to set_tim() (which will only reduce the race
 491          * this whole filtering tries to solve, not completely solve it)
 492          * this situation cannot happen.
 493          *
 494          * To completely solve this race drivers need to make sure that they
 495          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 496          *      functions and
 497          *  (b) always process RX events before TX status events if ordering
 498          *      can be unknown, for example with different interrupt status
 499          *      bits.
 500          */
 501         if (test_sta_flags(sta, WLAN_STA_PS) &&
 502             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
 503                 ieee80211_remove_tx_extra(local, sta->key, skb);
 504                 skb_queue_tail(&sta->tx_filtered, skb);
 505                 return;
 506         }
 507
 508         if (!test_sta_flags(sta, WLAN_STA_PS) &&
 509             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
 510                 /* Software retry the packet once */
 511                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
 512                 ieee80211_remove_tx_extra(local, sta->key, skb);
 513                 dev_queue_xmit(skb);
 514                 return;
 515         }
 516
 517 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 518         if (net_ratelimit())
 519                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
 520                        "queue_len=%d PS=%d @%lu\n",
 521                        wiphy_name(local->hw.wiphy),
 522                        skb_queue_len(&sta->tx_filtered),
 523                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
 524 #endif
 525         dev_kfree_skb(skb);
 526 }
 527
 528 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 529 {
 530         struct sk_buff *skb2;
 531         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 532         struct ieee80211_local *local = hw_to_local(hw);
 533         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 534         u16 frag, type;
 535         __le16 fc;
 536         struct ieee80211_tx_status_rtap_hdr *rthdr;
 537         struct ieee80211_sub_if_data *sdata;
 538         struct net_device *prev_dev = NULL;
 539         struct sta_info *sta;
 540
 541         rcu_read_lock();
 542
 543         if (info->status.excessive_retries) {
 544                 sta = sta_info_get(local, hdr->addr1);
 545                 if (sta) {
 546                         if (test_sta_flags(sta, WLAN_STA_PS)) {
 547                                 /*
 548                                  * The STA is in power save mode, so assume
 549                                  * that this TX packet failed because of that.
 550                                  */
 551                                 ieee80211_handle_filtered_frame(local, sta, skb);
 552                                 rcu_read_unlock();
 553                                 return;
 554                         }
 555                 }
 556         }
 557
 558         fc = hdr->frame_control;
 559
 560         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 561             (ieee80211_is_data_qos(fc))) {
 562                 u16 tid, ssn;
 563                 u8 *qc;
 564                 sta = sta_info_get(local, hdr->addr1);
 565                 if (sta) {
 566                         qc = ieee80211_get_qos_ctl(hdr);
 567                         tid = qc[0] & 0xf;
 568                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 569                                                 & IEEE80211_SCTL_SEQ);
 570                         ieee80211_send_bar(sta->sdata, hdr->addr1,
 571                                            tid, ssn);
 572                 }
 573         }
 574
 575         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 576                 sta = sta_info_get(local, hdr->addr1);
 577                 if (sta) {
 578                         ieee80211_handle_filtered_frame(local, sta, skb);
 579                         rcu_read_unlock();
 580                         return;
 581                 }
 582         } else
 583                 rate_control_tx_status(local->mdev, skb);
 584
 585         rcu_read_unlock();
 586
 587         ieee80211_led_tx(local, 0);
 588
 589         /* SNMP counters
 590          * Fragments are passed to low-level drivers as separate skbs, so these
 591          * are actually fragments, not frames. Update frame counters only for
 592          * the first fragment of the frame. */
 593
 594         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 595         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 596
 597         if (info->flags & IEEE80211_TX_STAT_ACK) {
 598                 if (frag == 0) {
 599                         local->dot11TransmittedFrameCount++;
 600                         if (is_multicast_ether_addr(hdr->addr1))
 601                                 local->dot11MulticastTransmittedFrameCount++;
 602                         if (info->status.retry_count > 0)
 603                                 local->dot11RetryCount++;
 604                         if (info->status.retry_count > 1)
 605                                 local->dot11MultipleRetryCount++;
 606                 }
 607
 608                 /* This counter shall be incremented for an acknowledged MPDU
 609                  * with an individual address in the address 1 field or an MPDU
 610                  * with a multicast address in the address 1 field of type Data
 611                  * or Management. */
 612                 if (!is_multicast_ether_addr(hdr->addr1) ||
 613                     type == IEEE80211_FTYPE_DATA ||
 614                     type == IEEE80211_FTYPE_MGMT)
 615                         local->dot11TransmittedFragmentCount++;
 616         } else {
 617                 if (frag == 0)
 618                         local->dot11FailedCount++;
 619         }
 620
 621         /* this was a transmitted frame, but now we want to reuse it */
 622         skb_orphan(skb);
 623
 624         /*
 625          * This is a bit racy but we can avoid a lot of work
 626          * with this test...
 627          */
 628         if (!local->monitors && !local->cooked_mntrs) {
 629                 dev_kfree_skb(skb);
 630                 return;
 631         }
 632
 633         /* send frame to monitor interfaces now */
 634
 635         if (skb_headroom(skb) < sizeof(*rthdr)) {
 636                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 637                 dev_kfree_skb(skb);
 638                 return;
 639         }
 640
 641         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
 642                                 skb_push(skb, sizeof(*rthdr));
 643
 644         memset(rthdr, 0, sizeof(*rthdr));
 645         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 646         rthdr->hdr.it_present =
 647                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 648                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 649
 650         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 651             !is_multicast_ether_addr(hdr->addr1))
 652                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 653
 654         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
 655             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
 656                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 657         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
 658                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 659
 660         rthdr->data_retries = info->status.retry_count;
 661
 662         /* XXX: is this sufficient for BPF? */
 663         skb_set_mac_header(skb, 0);
 664         skb->ip_summed = CHECKSUM_UNNECESSARY;
 665         skb->pkt_type = PACKET_OTHERHOST;
 666         skb->protocol = htons(ETH_P_802_2);
 667         memset(skb->cb, 0, sizeof(skb->cb));
 668
 669         rcu_read_lock();
 670         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 671                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 672                         if (!netif_running(sdata->dev))
 673                                 continue;
 674
 675                         if (prev_dev) {
 676                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 677                                 if (skb2) {
 678                                         skb2->dev = prev_dev;
 679                                         netif_rx(skb2);
 680                                 }
 681                         }
 682
 683                         prev_dev = sdata->dev;
 684                 }
 685         }
 686         if (prev_dev) {
 687                 skb->dev = prev_dev;
 688                 netif_rx(skb);
 689                 skb = NULL;
 690         }
 691         rcu_read_unlock();
 692         dev_kfree_skb(skb);
 693 }
 694 EXPORT_SYMBOL(ieee80211_tx_status);
 695
 696 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 697                                         const struct ieee80211_ops *ops)
 698 {
 699         struct ieee80211_local *local;
 700         int priv_size;
 701         struct wiphy *wiphy;
 702
 703         /* Ensure 32-byte alignment of our private data and hw private data.
 704          * We use the wiphy priv data for both our ieee80211_local and for
 705          * the driver's private data
 706          *
 707          * In memory it'll be like this:
 708          *
 709          * +-------------------------+
 710          * | struct wiphy           |
 711          * +-------------------------+
 712          * | struct ieee80211_local  |
 713          * +-------------------------+
 714          * | driver's private data   |
 715          * +-------------------------+
 716          *
 717          */
 718         priv_size = ((sizeof(struct ieee80211_local) +
 719                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 720                     priv_data_len;
 721
 722         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 723
 724         if (!wiphy)
 725                 return NULL;
 726
 727         wiphy->privid = mac80211_wiphy_privid;
 728
 729         local = wiphy_priv(wiphy);
 730         local->hw.wiphy = wiphy;
 731
 732         local->hw.priv = (char *)local +
 733                          ((sizeof(struct ieee80211_local) +
 734                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 735
 736         BUG_ON(!ops->tx);
 737         BUG_ON(!ops->start);
 738         BUG_ON(!ops->stop);
 739         BUG_ON(!ops->config);
 740         BUG_ON(!ops->add_interface);
 741         BUG_ON(!ops->remove_interface);
 742         BUG_ON(!ops->configure_filter);
 743         local->ops = ops;
 744
 745         local->hw.queues = 1; /* default */
 746
 747         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 748         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 749         local->short_retry_limit = 7;
 750         local->long_retry_limit = 4;
 751         local->hw.conf.radio_enabled = 1;
 752
 753         INIT_LIST_HEAD(&local->interfaces);
 754
 755         spin_lock_init(&local->key_lock);
 756
 757         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 758
 759         sta_info_init(local);
 760
 761         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 762                      (unsigned long)local);
 763         tasklet_disable(&local->tx_pending_tasklet);
 764
 765         tasklet_init(&local->tasklet,
 766                      ieee80211_tasklet_handler,
 767                      (unsigned long) local);
 768         tasklet_disable(&local->tasklet);
 769
 770         skb_queue_head_init(&local->skb_queue);
 771         skb_queue_head_init(&local->skb_queue_unreliable);
 772
 773         return local_to_hw(local);
 774 }
 775 EXPORT_SYMBOL(ieee80211_alloc_hw);
 776
 777 int ieee80211_register_hw(struct ieee80211_hw *hw)
 778 {
 779         struct ieee80211_local *local = hw_to_local(hw);
 780         const char *name;
 781         int result;
 782         enum ieee80211_band band;
 783         struct net_device *mdev;
 784         struct wireless_dev *mwdev;
 785
 786         /*
 787          * generic code guarantees at least one band,
 788          * set this very early because much code assumes
 789          * that hw.conf.channel is assigned
 790          */
 791         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 792                 struct ieee80211_supported_band *sband;
 793
 794                 sband = local->hw.wiphy->bands[band];
 795                 if (sband) {
 796                         /* init channel we're on */
 797                         local->hw.conf.channel =
 798                         local->oper_channel =
 799                         local->scan_channel = &sband->channels[0];
 800                         break;
 801                 }
 802         }
 803
 804         /* if low-level driver supports AP, we also support VLAN */
 805         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 806                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 807
 808         /* mac80211 always supports monitor */
 809         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 810
 811         result = wiphy_register(local->hw.wiphy);
 812         if (result < 0)
 813                 return result;
 814
 815         /*
 816          * We use the number of queues for feature tests (QoS, HT) internally
 817          * so restrict them appropriately.
 818          */
 819         if (hw->queues > IEEE80211_MAX_QUEUES)
 820                 hw->queues = IEEE80211_MAX_QUEUES;
 821         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
 822                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
 823         if (hw->queues < 4)
 824                 hw->ampdu_queues = 0;
 825
 826         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
 827                                "wmaster%d", ether_setup,
 828                                ieee80211_num_queues(hw));
 829         if (!mdev)
 830                 goto fail_mdev_alloc;
 831
 832         mwdev = netdev_priv(mdev);
 833         mdev->ieee80211_ptr = mwdev;
 834         mwdev->wiphy = local->hw.wiphy;
 835
 836         local->mdev = mdev;
 837
 838         ieee80211_rx_bss_list_init(local);
 839
 840         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 841         mdev->open = ieee80211_master_open;
 842         mdev->stop = ieee80211_master_stop;
 843         mdev->type = ARPHRD_IEEE80211;
 844         mdev->header_ops = &ieee80211_header_ops;
 845         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 846
 847         name = wiphy_dev(local->hw.wiphy)->driver->name;
 848         local->hw.workqueue = create_freezeable_workqueue(name);
 849         if (!local->hw.workqueue) {
 850                 result = -ENOMEM;
 851                 goto fail_workqueue;
 852         }
 853
 854         /*
 855          * The hardware needs headroom for sending the frame,
 856          * and we need some headroom for passing the frame to monitor
 857          * interfaces, but never both at the same time.
 858          */
 859         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 860                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 861
 862         debugfs_hw_add(local);
 863
 864         if (local->hw.conf.beacon_int < 10)
 865                 local->hw.conf.beacon_int = 100;
 866
 867         if (local->hw.max_listen_interval == 0)
 868                 local->hw.max_listen_interval = 1;
 869
 870         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 871
 872         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
 873                                                   IEEE80211_HW_SIGNAL_DB |
 874                                                   IEEE80211_HW_SIGNAL_DBM) ?
 875                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
 876         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
 877                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
 878         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 879                 local->wstats_flags |= IW_QUAL_DBM;
 880
 881         result = sta_info_start(local);
 882         if (result < 0)
 883                 goto fail_sta_info;
 884
 885         rtnl_lock();
 886         result = dev_alloc_name(local->mdev, local->mdev->name);
 887         if (result < 0)
 888                 goto fail_dev;
 889
 890         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 891         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
 892
 893         result = register_netdevice(local->mdev);
 894         if (result < 0)
 895                 goto fail_dev;
 896
 897         result = ieee80211_init_rate_ctrl_alg(local,
 898                                               hw->rate_control_algorithm);
 899         if (result < 0) {
 900                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 901                        "algorithm\n", wiphy_name(local->hw.wiphy));
 902                 goto fail_rate;
 903         }
 904
 905         result = ieee80211_wep_init(local);
 906
 907         if (result < 0) {
 908                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 909                        wiphy_name(local->hw.wiphy), result);
 910                 goto fail_wep;
 911         }
 912
 913         local->mdev->select_queue = ieee80211_select_queue;
 914
 915         /* add one default STA interface */
 916         result = ieee80211_if_add(local, "wlan%d", NULL,
 917                                   NL80211_IFTYPE_STATION, NULL);
 918         if (result)
 919                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 920                        wiphy_name(local->hw.wiphy));
 921
 922         rtnl_unlock();
 923
 924         ieee80211_led_init(local);
 925
 926         return 0;
 927
 928 fail_wep:
 929         rate_control_deinitialize(local);
 930 fail_rate:
 931         unregister_netdevice(local->mdev);
 932         local->mdev = NULL;
 933 fail_dev:
 934         rtnl_unlock();
 935         sta_info_stop(local);
 936 fail_sta_info:
 937         debugfs_hw_del(local);
 938         destroy_workqueue(local->hw.workqueue);
 939 fail_workqueue:
 940         if (local->mdev)
 941                 free_netdev(local->mdev);
 942 fail_mdev_alloc:
 943         wiphy_unregister(local->hw.wiphy);
 944         return result;
 945 }
 946 EXPORT_SYMBOL(ieee80211_register_hw);
 947
 948 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 949 {
 950         struct ieee80211_local *local = hw_to_local(hw);
 951
 952         tasklet_kill(&local->tx_pending_tasklet);
 953         tasklet_kill(&local->tasklet);
 954
 955         rtnl_lock();
 956
 957         /*
 958          * At this point, interface list manipulations are fine
 959          * because the driver cannot be handing us frames any
 960          * more and the tasklet is killed.
 961          */
 962
 963         /* First, we remove all virtual interfaces. */
 964         ieee80211_remove_interfaces(local);
 965
 966         /* then, finally, remove the master interface */
 967         unregister_netdevice(local->mdev);
 968
 969         rtnl_unlock();
 970
 971         ieee80211_rx_bss_list_deinit(local);
 972         ieee80211_clear_tx_pending(local);
 973         sta_info_stop(local);
 974         rate_control_deinitialize(local);
 975         debugfs_hw_del(local);
 976
 977         if (skb_queue_len(&local->skb_queue)
 978                         || skb_queue_len(&local->skb_queue_unreliable))
 979                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 980                        wiphy_name(local->hw.wiphy));
 981         skb_queue_purge(&local->skb_queue);
 982         skb_queue_purge(&local->skb_queue_unreliable);
 983
 984         destroy_workqueue(local->hw.workqueue);
 985         wiphy_unregister(local->hw.wiphy);
 986         ieee80211_wep_free(local);
 987         ieee80211_led_exit(local);
 988         free_netdev(local->mdev);
 989 }
 990 EXPORT_SYMBOL(ieee80211_unregister_hw);
 991
 992 void ieee80211_free_hw(struct ieee80211_hw *hw)
 993 {
 994         struct ieee80211_local *local = hw_to_local(hw);
 995
 996         wiphy_free(local->hw.wiphy);
 997 }
 998 EXPORT_SYMBOL(ieee80211_free_hw);
 999
1000 static int __init ieee80211_init(void)
1001 {
1002         struct sk_buff *skb;
1003         int ret;
1004
1005         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1006         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1007                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1008
1009         ret = rc80211_pid_init();
1010         if (ret)
1011                 return ret;
1012
1013         ieee80211_debugfs_netdev_init();
1014
1015         return 0;
1016 }
1017
1018 static void __exit ieee80211_exit(void)
1019 {
1020         rc80211_pid_exit();
1021
1022         /*
1023          * For key todo, it'll be empty by now but the work
1024          * might still be scheduled.
1025          */
1026         flush_scheduled_work();
1027
1028         if (mesh_allocated)
1029                 ieee80211s_stop();
1030
1031         ieee80211_debugfs_netdev_exit();
1032 }
1033
1034
1035 subsys_initcall(ieee80211_init);
1036 module_exit(ieee80211_exit);
1037
1038 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1039 MODULE_LICENSE("GPL");