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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 /* common interface routines */
  49
  50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  51 {
  52         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  53         return ETH_ALEN;
  54 }
  55
  56 /* must be called under mdev tx lock */
  57 static void ieee80211_configure_filter(struct ieee80211_local *local)
  58 {
  59         unsigned int changed_flags;
  60         unsigned int new_flags = 0;
  61
  62         if (atomic_read(&local->iff_promiscs))
  63                 new_flags |= FIF_PROMISC_IN_BSS;
  64
  65         if (atomic_read(&local->iff_allmultis))
  66                 new_flags |= FIF_ALLMULTI;
  67
  68         if (local->monitors)
  69                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  70
  71         if (local->fif_fcsfail)
  72                 new_flags |= FIF_FCSFAIL;
  73
  74         if (local->fif_plcpfail)
  75                 new_flags |= FIF_PLCPFAIL;
  76
  77         if (local->fif_control)
  78                 new_flags |= FIF_CONTROL;
  79
  80         if (local->fif_other_bss)
  81                 new_flags |= FIF_OTHER_BSS;
  82
  83         changed_flags = local->filter_flags ^ new_flags;
  84
  85         /* be a bit nasty */
  86         new_flags |= (1<<31);
  87
  88         local->ops->configure_filter(local_to_hw(local),
  89                                      changed_flags, &new_flags,
  90                                      local->mdev->mc_count,
  91                                      local->mdev->mc_list);
  92
  93         WARN_ON(new_flags & (1<<31));
  94
  95         local->filter_flags = new_flags & ~(1<<31);
  96 }
  97
  98 /* master interface */
  99
 100 static int ieee80211_master_open(struct net_device *dev)
 101 {
 102         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 103         struct ieee80211_sub_if_data *sdata;
 104         int res = -EOPNOTSUPP;
 105
 106         /* we hold the RTNL here so can safely walk the list */
 107         list_for_each_entry(sdata, &local->interfaces, list) {
 108                 if (netif_running(sdata->dev)) {
 109                         res = 0;
 110                         break;
 111                 }
 112         }
 113
 114         if (res)
 115                 return res;
 116
 117         netif_tx_start_all_queues(local->mdev);
 118
 119         return 0;
 120 }
 121
 122 static int ieee80211_master_stop(struct net_device *dev)
 123 {
 124         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 125         struct ieee80211_sub_if_data *sdata;
 126
 127         /* we hold the RTNL here so can safely walk the list */
 128         list_for_each_entry(sdata, &local->interfaces, list)
 129                 if (netif_running(sdata->dev))
 130                         dev_close(sdata->dev);
 131
 132         return 0;
 133 }
 134
 135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 136 {
 137         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 138
 139         ieee80211_configure_filter(local);
 140 }
 141
 142 /* regular interfaces */
 143
 144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 145 {
 146         int meshhdrlen;
 147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 148
 149         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 150
 151         /* FIX: what would be proper limits for MTU?
 152          * This interface uses 802.3 frames. */
 153         if (new_mtu < 256 ||
 154             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 155                 return -EINVAL;
 156         }
 157
 158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 159         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 161         dev->mtu = new_mtu;
 162         return 0;
 163 }
 164
 165 static inline int identical_mac_addr_allowed(int type1, int type2)
 166 {
 167         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 168                 type2 == IEEE80211_IF_TYPE_MNTR ||
 169                 (type1 == IEEE80211_IF_TYPE_AP &&
 170                  type2 == IEEE80211_IF_TYPE_WDS) ||
 171                 (type1 == IEEE80211_IF_TYPE_WDS &&
 172                  (type2 == IEEE80211_IF_TYPE_WDS ||
 173                   type2 == IEEE80211_IF_TYPE_AP)) ||
 174                 (type1 == IEEE80211_IF_TYPE_AP &&
 175                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 176                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 177                  (type2 == IEEE80211_IF_TYPE_AP ||
 178                   type2 == IEEE80211_IF_TYPE_VLAN)));
 179 }
 180
 181 static int ieee80211_open(struct net_device *dev)
 182 {
 183         struct ieee80211_sub_if_data *sdata, *nsdata;
 184         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 185         struct sta_info *sta;
 186         struct ieee80211_if_init_conf conf;
 187         u32 changed = 0;
 188         int res;
 189         bool need_hw_reconfig = 0;
 190         u8 null_addr[ETH_ALEN] = {0};
 191
 192         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 193
 194         /* fail early if user set an invalid address */
 195         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 196             !is_valid_ether_addr(dev->dev_addr))
 197                 return -EADDRNOTAVAIL;
 198
 199         /* we hold the RTNL here so can safely walk the list */
 200         list_for_each_entry(nsdata, &local->interfaces, list) {
 201                 struct net_device *ndev = nsdata->dev;
 202
 203                 if (ndev != dev && netif_running(ndev)) {
 204                         /*
 205                          * Allow only a single IBSS interface to be up at any
 206                          * time. This is restricted because beacon distribution
 207                          * cannot work properly if both are in the same IBSS.
 208                          *
 209                          * To remove this restriction we'd have to disallow them
 210                          * from setting the same SSID on different IBSS interfaces
 211                          * belonging to the same hardware. Then, however, we're
 212                          * faced with having to adopt two different TSF timers...
 213                          */
 214                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 215                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 216                                 return -EBUSY;
 217
 218                         /*
 219                          * The remaining checks are only performed for interfaces
 220                          * with the same MAC address.
 221                          */
 222                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 223                                 continue;
 224
 225                         /*
 226                          * check whether it may have the same address
 227                          */
 228                         if (!identical_mac_addr_allowed(sdata->vif.type,
 229                                                         nsdata->vif.type))
 230                                 return -ENOTUNIQ;
 231
 232                         /*
 233                          * can only add VLANs to enabled APs
 234                          */
 235                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 236                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 237                                 sdata->bss = &nsdata->u.ap;
 238                 }
 239         }
 240
 241         switch (sdata->vif.type) {
 242         case IEEE80211_IF_TYPE_WDS:
 243                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 244                         return -ENOLINK;
 245                 break;
 246         case IEEE80211_IF_TYPE_VLAN:
 247                 if (!sdata->bss)
 248                         return -ENOLINK;
 249                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 250                 break;
 251         case IEEE80211_IF_TYPE_AP:
 252                 sdata->bss = &sdata->u.ap;
 253                 break;
 254         case IEEE80211_IF_TYPE_MESH_POINT:
 255                 /* mesh ifaces must set allmulti to forward mcast traffic */
 256                 atomic_inc(&local->iff_allmultis);
 257                 break;
 258         case IEEE80211_IF_TYPE_STA:
 259         case IEEE80211_IF_TYPE_MNTR:
 260         case IEEE80211_IF_TYPE_IBSS:
 261                 /* no special treatment */
 262                 break;
 263         case IEEE80211_IF_TYPE_INVALID:
 264                 /* cannot happen */
 265                 WARN_ON(1);
 266                 break;
 267         }
 268
 269         if (local->open_count == 0) {
 270                 res = 0;
 271                 if (local->ops->start)
 272                         res = local->ops->start(local_to_hw(local));
 273                 if (res)
 274                         goto err_del_bss;
 275                 need_hw_reconfig = 1;
 276                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 277         }
 278
 279         /*
 280          * Check all interfaces and copy the hopefully now-present
 281          * MAC address to those that have the special null one.
 282          */
 283         list_for_each_entry(nsdata, &local->interfaces, list) {
 284                 struct net_device *ndev = nsdata->dev;
 285
 286                 /*
 287                  * No need to check netif_running since we do not allow
 288                  * it to start up with this invalid address.
 289                  */
 290                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 291                         memcpy(ndev->dev_addr,
 292                                local->hw.wiphy->perm_addr,
 293                                ETH_ALEN);
 294         }
 295
 296         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 297                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 298                        ETH_ALEN);
 299
 300         /*
 301          * Validate the MAC address for this device.
 302          */
 303         if (!is_valid_ether_addr(dev->dev_addr)) {
 304                 if (!local->open_count && local->ops->stop)
 305                         local->ops->stop(local_to_hw(local));
 306                 return -EADDRNOTAVAIL;
 307         }
 308
 309         switch (sdata->vif.type) {
 310         case IEEE80211_IF_TYPE_VLAN:
 311                 /* no need to tell driver */
 312                 break;
 313         case IEEE80211_IF_TYPE_MNTR:
 314                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 315                         local->cooked_mntrs++;
 316                         break;
 317                 }
 318
 319                 /* must be before the call to ieee80211_configure_filter */
 320                 local->monitors++;
 321                 if (local->monitors == 1)
 322                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 323
 324                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 325                         local->fif_fcsfail++;
 326                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 327                         local->fif_plcpfail++;
 328                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 329                         local->fif_control++;
 330                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 331                         local->fif_other_bss++;
 332
 333                 netif_addr_lock_bh(local->mdev);
 334                 ieee80211_configure_filter(local);
 335                 netif_addr_unlock_bh(local->mdev);
 336                 break;
 337         case IEEE80211_IF_TYPE_STA:
 338         case IEEE80211_IF_TYPE_IBSS:
 339                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 340                 /* fall through */
 341         default:
 342                 conf.vif = &sdata->vif;
 343                 conf.type = sdata->vif.type;
 344                 conf.mac_addr = dev->dev_addr;
 345                 res = local->ops->add_interface(local_to_hw(local), &conf);
 346                 if (res)
 347                         goto err_stop;
 348
 349                 if (ieee80211_vif_is_mesh(&sdata->vif))
 350                         ieee80211_start_mesh(sdata);
 351                 changed |= ieee80211_reset_erp_info(sdata);
 352                 ieee80211_bss_info_change_notify(sdata, changed);
 353                 ieee80211_enable_keys(sdata);
 354
 355                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 356                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 357                         netif_carrier_off(dev);
 358                 else
 359                         netif_carrier_on(dev);
 360         }
 361
 362         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 363                 /* Create STA entry for the WDS peer */
 364                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 365                                      GFP_KERNEL);
 366                 if (!sta) {
 367                         res = -ENOMEM;
 368                         goto err_del_interface;
 369                 }
 370
 371                 /* no locking required since STA is not live yet */
 372                 sta->flags |= WLAN_STA_AUTHORIZED;
 373
 374                 res = sta_info_insert(sta);
 375                 if (res) {
 376                         /* STA has been freed */
 377                         goto err_del_interface;
 378                 }
 379         }
 380
 381         if (local->open_count == 0) {
 382                 res = dev_open(local->mdev);
 383                 WARN_ON(res);
 384                 if (res)
 385                         goto err_del_interface;
 386                 tasklet_enable(&local->tx_pending_tasklet);
 387                 tasklet_enable(&local->tasklet);
 388         }
 389
 390         /*
 391          * set_multicast_list will be invoked by the networking core
 392          * which will check whether any increments here were done in
 393          * error and sync them down to the hardware as filter flags.
 394          */
 395         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 396                 atomic_inc(&local->iff_allmultis);
 397
 398         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 399                 atomic_inc(&local->iff_promiscs);
 400
 401         local->open_count++;
 402         if (need_hw_reconfig) {
 403                 ieee80211_hw_config(local);
 404                 /*
 405                  * set default queue parameters so drivers don't
 406                  * need to initialise the hardware if the hardware
 407                  * doesn't start up with sane defaults
 408                  */
 409                 ieee80211_set_wmm_default(sdata);
 410         }
 411
 412         /*
 413          * ieee80211_sta_work is disabled while network interface
 414          * is down. Therefore, some configuration changes may not
 415          * yet be effective. Trigger execution of ieee80211_sta_work
 416          * to fix this.
 417          */
 418         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 419             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 420                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 421                 queue_work(local->hw.workqueue, &ifsta->work);
 422         }
 423
 424         netif_tx_start_all_queues(dev);
 425
 426         return 0;
 427  err_del_interface:
 428         local->ops->remove_interface(local_to_hw(local), &conf);
 429  err_stop:
 430         if (!local->open_count && local->ops->stop)
 431                 local->ops->stop(local_to_hw(local));
 432  err_del_bss:
 433         sdata->bss = NULL;
 434         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
 435                 list_del(&sdata->u.vlan.list);
 436         return res;
 437 }
 438
 439 static int ieee80211_stop(struct net_device *dev)
 440 {
 441         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 442         struct ieee80211_local *local = sdata->local;
 443         struct ieee80211_if_init_conf conf;
 444         struct sta_info *sta;
 445
 446         /*
 447          * Stop TX on this interface first.
 448          */
 449         netif_tx_stop_all_queues(dev);
 450
 451         /*
 452          * Now delete all active aggregation sessions.
 453          */
 454         rcu_read_lock();
 455
 456         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 457                 if (sta->sdata == sdata)
 458                         ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
 459         }
 460
 461         rcu_read_unlock();
 462
 463         /*
 464          * Remove all stations associated with this interface.
 465          *
 466          * This must be done before calling ops->remove_interface()
 467          * because otherwise we can later invoke ops->sta_notify()
 468          * whenever the STAs are removed, and that invalidates driver
 469          * assumptions about always getting a vif pointer that is valid
 470          * (because if we remove a STA after ops->remove_interface()
 471          * the driver will have removed the vif info already!)
 472          *
 473          * We could relax this and only unlink the stations from the
 474          * hash table and list but keep them on a per-sdata list that
 475          * will be inserted back again when the interface is brought
 476          * up again, but I don't currently see a use case for that,
 477          * except with WDS which gets a STA entry created when it is
 478          * brought up.
 479          */
 480         sta_info_flush(local, sdata);
 481
 482         /*
 483          * Don't count this interface for promisc/allmulti while it
 484          * is down. dev_mc_unsync() will invoke set_multicast_list
 485          * on the master interface which will sync these down to the
 486          * hardware as filter flags.
 487          */
 488         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 489                 atomic_dec(&local->iff_allmultis);
 490
 491         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 492                 atomic_dec(&local->iff_promiscs);
 493
 494         dev_mc_unsync(local->mdev, dev);
 495
 496         /* APs need special treatment */
 497         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 498                 struct ieee80211_sub_if_data *vlan, *tmp;
 499                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 500
 501                 /* remove beacon */
 502                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 503                 synchronize_rcu();
 504                 kfree(old_beacon);
 505
 506                 /* down all dependent devices, that is VLANs */
 507                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 508                                          u.vlan.list)
 509                         dev_close(vlan->dev);
 510                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 511         }
 512
 513         local->open_count--;
 514
 515         switch (sdata->vif.type) {
 516         case IEEE80211_IF_TYPE_VLAN:
 517                 list_del(&sdata->u.vlan.list);
 518                 /* no need to tell driver */
 519                 break;
 520         case IEEE80211_IF_TYPE_MNTR:
 521                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 522                         local->cooked_mntrs--;
 523                         break;
 524                 }
 525
 526                 local->monitors--;
 527                 if (local->monitors == 0)
 528                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 529
 530                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 531                         local->fif_fcsfail--;
 532                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 533                         local->fif_plcpfail--;
 534                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 535                         local->fif_control--;
 536                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 537                         local->fif_other_bss--;
 538
 539                 netif_addr_lock_bh(local->mdev);
 540                 ieee80211_configure_filter(local);
 541                 netif_addr_unlock_bh(local->mdev);
 542                 break;
 543         case IEEE80211_IF_TYPE_MESH_POINT:
 544                 /* allmulti is always set on mesh ifaces */
 545                 atomic_dec(&local->iff_allmultis);
 546                 /* fall through */
 547         case IEEE80211_IF_TYPE_STA:
 548         case IEEE80211_IF_TYPE_IBSS:
 549                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
 550                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 551                 del_timer_sync(&sdata->u.sta.timer);
 552                 /*
 553                  * When we get here, the interface is marked down.
 554                  * Call synchronize_rcu() to wait for the RX path
 555                  * should it be using the interface and enqueuing
 556                  * frames at this very time on another CPU.
 557                  */
 558                 synchronize_rcu();
 559                 skb_queue_purge(&sdata->u.sta.skb_queue);
 560
 561                 if (local->scan_sdata == sdata) {
 562                         if (!local->ops->hw_scan) {
 563                                 local->sta_sw_scanning = 0;
 564                                 cancel_delayed_work(&local->scan_work);
 565                         } else
 566                                 local->sta_hw_scanning = 0;
 567                 }
 568
 569                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 570                 kfree(sdata->u.sta.extra_ie);
 571                 sdata->u.sta.extra_ie = NULL;
 572                 sdata->u.sta.extra_ie_len = 0;
 573                 /* fall through */
 574         default:
 575                 conf.vif = &sdata->vif;
 576                 conf.type = sdata->vif.type;
 577                 conf.mac_addr = dev->dev_addr;
 578                 /* disable all keys for as long as this netdev is down */
 579                 ieee80211_disable_keys(sdata);
 580                 local->ops->remove_interface(local_to_hw(local), &conf);
 581         }
 582
 583         sdata->bss = NULL;
 584
 585         if (local->open_count == 0) {
 586                 if (netif_running(local->mdev))
 587                         dev_close(local->mdev);
 588
 589                 if (local->ops->stop)
 590                         local->ops->stop(local_to_hw(local));
 591
 592                 ieee80211_led_radio(local, 0);
 593
 594                 flush_workqueue(local->hw.workqueue);
 595
 596                 tasklet_disable(&local->tx_pending_tasklet);
 597                 tasklet_disable(&local->tasklet);
 598         }
 599
 600         return 0;
 601 }
 602
 603 static void ieee80211_set_multicast_list(struct net_device *dev)
 604 {
 605         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 606         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 607         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 608
 609         allmulti = !!(dev->flags & IFF_ALLMULTI);
 610         promisc = !!(dev->flags & IFF_PROMISC);
 611         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 612         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 613
 614         if (allmulti != sdata_allmulti) {
 615                 if (dev->flags & IFF_ALLMULTI)
 616                         atomic_inc(&local->iff_allmultis);
 617                 else
 618                         atomic_dec(&local->iff_allmultis);
 619                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 620         }
 621
 622         if (promisc != sdata_promisc) {
 623                 if (dev->flags & IFF_PROMISC)
 624                         atomic_inc(&local->iff_promiscs);
 625                 else
 626                         atomic_dec(&local->iff_promiscs);
 627                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 628         }
 629
 630         dev_mc_sync(local->mdev, dev);
 631 }
 632
 633 static const struct header_ops ieee80211_header_ops = {
 634         .create         = eth_header,
 635         .parse          = header_parse_80211,
 636         .rebuild        = eth_rebuild_header,
 637         .cache          = eth_header_cache,
 638         .cache_update   = eth_header_cache_update,
 639 };
 640
 641 void ieee80211_if_setup(struct net_device *dev)
 642 {
 643         ether_setup(dev);
 644         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 645         dev->wireless_handlers = &ieee80211_iw_handler_def;
 646         dev->set_multicast_list = ieee80211_set_multicast_list;
 647         dev->change_mtu = ieee80211_change_mtu;
 648         dev->open = ieee80211_open;
 649         dev->stop = ieee80211_stop;
 650         dev->destructor = free_netdev;
 651         /* we will validate the address ourselves in ->open */
 652         dev->validate_addr = NULL;
 653 }
 654
 655 /* everything else */
 656
 657 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 658 {
 659         struct ieee80211_local *local = sdata->local;
 660         struct ieee80211_if_conf conf;
 661
 662         if (WARN_ON(!netif_running(sdata->dev)))
 663                 return 0;
 664
 665         if (!local->ops->config_interface)
 666                 return 0;
 667
 668         memset(&conf, 0, sizeof(conf));
 669         conf.changed = changed;
 670
 671         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 672             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 673                 conf.bssid = sdata->u.sta.bssid;
 674                 conf.ssid = sdata->u.sta.ssid;
 675                 conf.ssid_len = sdata->u.sta.ssid_len;
 676         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 677                 conf.bssid = sdata->dev->dev_addr;
 678                 conf.ssid = sdata->u.ap.ssid;
 679                 conf.ssid_len = sdata->u.ap.ssid_len;
 680         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 681                 u8 zero[ETH_ALEN] = { 0 };
 682                 conf.bssid = zero;
 683                 conf.ssid = zero;
 684                 conf.ssid_len = 0;
 685         } else {
 686                 WARN_ON(1);
 687                 return -EINVAL;
 688         }
 689
 690         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 691                 return -EINVAL;
 692
 693         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 694                 return -EINVAL;
 695
 696         return local->ops->config_interface(local_to_hw(local),
 697                                             &sdata->vif, &conf);
 698 }
 699
 700 int ieee80211_hw_config(struct ieee80211_local *local)
 701 {
 702         struct ieee80211_channel *chan;
 703         int ret = 0;
 704
 705         if (local->sta_sw_scanning)
 706                 chan = local->scan_channel;
 707         else
 708                 chan = local->oper_channel;
 709
 710         local->hw.conf.channel = chan;
 711
 712         if (!local->hw.conf.power_level)
 713                 local->hw.conf.power_level = chan->max_power;
 714         else
 715                 local->hw.conf.power_level = min(chan->max_power,
 716                                                local->hw.conf.power_level);
 717
 718         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
 719
 720 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 721         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 722                wiphy_name(local->hw.wiphy), chan->center_freq);
 723 #endif
 724
 725         if (local->open_count)
 726                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 727
 728         return ret;
 729 }
 730
 731 /**
 732  * ieee80211_handle_ht should be used only after legacy configuration
 733  * has been determined namely band, as ht configuration depends upon
 734  * the hardware's HT abilities for a _specific_ band.
 735  */
 736 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 737                            struct ieee80211_ht_info *req_ht_cap,
 738                            struct ieee80211_ht_bss_info *req_bss_cap)
 739 {
 740         struct ieee80211_conf *conf = &local->hw.conf;
 741         struct ieee80211_supported_band *sband;
 742         struct ieee80211_ht_info ht_conf;
 743         struct ieee80211_ht_bss_info ht_bss_conf;
 744         u32 changed = 0;
 745         int i;
 746         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
 747         u8 tx_mcs_set_cap;
 748
 749         sband = local->hw.wiphy->bands[conf->channel->band];
 750
 751         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
 752         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
 753
 754         /* HT is not supported */
 755         if (!sband->ht_info.ht_supported) {
 756                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 757                 goto out;
 758         }
 759
 760         /* disable HT */
 761         if (!enable_ht) {
 762                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
 763                         changed |= BSS_CHANGED_HT;
 764                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 765                 conf->ht_conf.ht_supported = 0;
 766                 goto out;
 767         }
 768
 769
 770         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
 771                 changed |= BSS_CHANGED_HT;
 772
 773         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 774         ht_conf.ht_supported = 1;
 775
 776         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
 777         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
 778         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
 779         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
 780         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 781         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 782
 783         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 784         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 785
 786         /* Bits 96-100 */
 787         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
 788
 789         /* configure suppoerted Tx MCS according to requested MCS
 790          * (based in most cases on Rx capabilities of peer) and self
 791          * Tx MCS capabilities (as defined by low level driver HW
 792          * Tx capabilities) */
 793         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
 794                 goto check_changed;
 795
 796         /* Counting from 0 therfore + 1 */
 797         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
 798                 max_tx_streams = ((tx_mcs_set_cap &
 799                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
 800
 801         for (i = 0; i < max_tx_streams; i++)
 802                 ht_conf.supp_mcs_set[i] =
 803                         sband->ht_info.supp_mcs_set[i] &
 804                                         req_ht_cap->supp_mcs_set[i];
 805
 806         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
 807                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
 808                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
 809                         ht_conf.supp_mcs_set[i] =
 810                                 sband->ht_info.supp_mcs_set[i] &
 811                                         req_ht_cap->supp_mcs_set[i];
 812
 813 check_changed:
 814         /* if bss configuration changed store the new one */
 815         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
 816             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
 817                 changed |= BSS_CHANGED_HT;
 818                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
 819                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
 820         }
 821 out:
 822         return changed;
 823 }
 824
 825 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 826                                       u32 changed)
 827 {
 828         struct ieee80211_local *local = sdata->local;
 829
 830         if (!changed)
 831                 return;
 832
 833         if (local->ops->bss_info_changed)
 834                 local->ops->bss_info_changed(local_to_hw(local),
 835                                              &sdata->vif,
 836                                              &sdata->bss_conf,
 837                                              changed);
 838 }
 839
 840 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 841 {
 842         sdata->bss_conf.use_cts_prot = 0;
 843         sdata->bss_conf.use_short_preamble = 0;
 844         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
 845 }
 846
 847 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 848                                  struct sk_buff *skb)
 849 {
 850         struct ieee80211_local *local = hw_to_local(hw);
 851         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 852         int tmp;
 853
 854         skb->dev = local->mdev;
 855         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 856         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 857                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 858         tmp = skb_queue_len(&local->skb_queue) +
 859                 skb_queue_len(&local->skb_queue_unreliable);
 860         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 861                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 862                 dev_kfree_skb_irq(skb);
 863                 tmp--;
 864                 I802_DEBUG_INC(local->tx_status_drop);
 865         }
 866         tasklet_schedule(&local->tasklet);
 867 }
 868 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 869
 870 static void ieee80211_tasklet_handler(unsigned long data)
 871 {
 872         struct ieee80211_local *local = (struct ieee80211_local *) data;
 873         struct sk_buff *skb;
 874         struct ieee80211_rx_status rx_status;
 875         struct ieee80211_ra_tid *ra_tid;
 876
 877         while ((skb = skb_dequeue(&local->skb_queue)) ||
 878                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 879                 switch (skb->pkt_type) {
 880                 case IEEE80211_RX_MSG:
 881                         /* status is in skb->cb */
 882                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 883                         /* Clear skb->pkt_type in order to not confuse kernel
 884                          * netstack. */
 885                         skb->pkt_type = 0;
 886                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 887                         break;
 888                 case IEEE80211_TX_STATUS_MSG:
 889                         skb->pkt_type = 0;
 890                         ieee80211_tx_status(local_to_hw(local), skb);
 891                         break;
 892                 case IEEE80211_DELBA_MSG:
 893                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 894                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 895                                                 ra_tid->ra, ra_tid->tid);
 896                         dev_kfree_skb(skb);
 897                         break;
 898                 case IEEE80211_ADDBA_MSG:
 899                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 900                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 901                                                  ra_tid->ra, ra_tid->tid);
 902                         dev_kfree_skb(skb);
 903                         break ;
 904                 default:
 905                         WARN_ON(1);
 906                         dev_kfree_skb(skb);
 907                         break;
 908                 }
 909         }
 910 }
 911
 912 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 913  * make a prepared TX frame (one that has been given to hw) to look like brand
 914  * new IEEE 802.11 frame that is ready to go through TX processing again.
 915  */
 916 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 917                                       struct ieee80211_key *key,
 918                                       struct sk_buff *skb)
 919 {
 920         unsigned int hdrlen, iv_len, mic_len;
 921         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 922
 923         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 924
 925         if (!key)
 926                 goto no_key;
 927
 928         switch (key->conf.alg) {
 929         case ALG_WEP:
 930                 iv_len = WEP_IV_LEN;
 931                 mic_len = WEP_ICV_LEN;
 932                 break;
 933         case ALG_TKIP:
 934                 iv_len = TKIP_IV_LEN;
 935                 mic_len = TKIP_ICV_LEN;
 936                 break;
 937         case ALG_CCMP:
 938                 iv_len = CCMP_HDR_LEN;
 939                 mic_len = CCMP_MIC_LEN;
 940                 break;
 941         default:
 942                 goto no_key;
 943         }
 944
 945         if (skb->len >= hdrlen + mic_len &&
 946             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 947                 skb_trim(skb, skb->len - mic_len);
 948         if (skb->len >= hdrlen + iv_len) {
 949                 memmove(skb->data + iv_len, skb->data, hdrlen);
 950                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 951         }
 952
 953 no_key:
 954         if (ieee80211_is_data_qos(hdr->frame_control)) {
 955                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 956                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 957                         hdrlen - IEEE80211_QOS_CTL_LEN);
 958                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 959         }
 960 }
 961
 962 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 963                                             struct sta_info *sta,
 964                                             struct sk_buff *skb)
 965 {
 966         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 967
 968         sta->tx_filtered_count++;
 969
 970         /*
 971          * Clear the TX filter mask for this STA when sending the next
 972          * packet. If the STA went to power save mode, this will happen
 973          * when it wakes up for the next time.
 974          */
 975         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 976
 977         /*
 978          * This code races in the following way:
 979          *
 980          *  (1) STA sends frame indicating it will go to sleep and does so
 981          *  (2) hardware/firmware adds STA to filter list, passes frame up
 982          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 983          *  (4) we get TX status before having processed the frame and
 984          *      knowing that the STA has gone to sleep.
 985          *
 986          * This is actually quite unlikely even when both those events are
 987          * processed from interrupts coming in quickly after one another or
 988          * even at the same time because we queue both TX status events and
 989          * RX frames to be processed by a tasklet and process them in the
 990          * same order that they were received or TX status last. Hence, there
 991          * is no race as long as the frame RX is processed before the next TX
 992          * status, which drivers can ensure, see below.
 993          *
 994          * Note that this can only happen if the hardware or firmware can
 995          * actually add STAs to the filter list, if this is done by the
 996          * driver in response to set_tim() (which will only reduce the race
 997          * this whole filtering tries to solve, not completely solve it)
 998          * this situation cannot happen.
 999          *
1000          * To completely solve this race drivers need to make sure that they
1001          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1002          *      functions and
1003          *  (b) always process RX events before TX status events if ordering
1004          *      can be unknown, for example with different interrupt status
1005          *      bits.
1006          */
1007         if (test_sta_flags(sta, WLAN_STA_PS) &&
1008             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1009                 ieee80211_remove_tx_extra(local, sta->key, skb);
1010                 skb_queue_tail(&sta->tx_filtered, skb);
1011                 return;
1012         }
1013
1014         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1015             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1016                 /* Software retry the packet once */
1017                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1018                 ieee80211_remove_tx_extra(local, sta->key, skb);
1019                 dev_queue_xmit(skb);
1020                 return;
1021         }
1022
1023 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1024         if (net_ratelimit())
1025                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1026                        "queue_len=%d PS=%d @%lu\n",
1027                        wiphy_name(local->hw.wiphy),
1028                        skb_queue_len(&sta->tx_filtered),
1029                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1030 #endif
1031         dev_kfree_skb(skb);
1032 }
1033
1034 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1035 {
1036         struct sk_buff *skb2;
1037         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1038         struct ieee80211_local *local = hw_to_local(hw);
1039         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1040         u16 frag, type;
1041         __le16 fc;
1042         struct ieee80211_tx_status_rtap_hdr *rthdr;
1043         struct ieee80211_sub_if_data *sdata;
1044         struct net_device *prev_dev = NULL;
1045         struct sta_info *sta;
1046
1047         rcu_read_lock();
1048
1049         if (info->status.excessive_retries) {
1050                 sta = sta_info_get(local, hdr->addr1);
1051                 if (sta) {
1052                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1053                                 /*
1054                                  * The STA is in power save mode, so assume
1055                                  * that this TX packet failed because of that.
1056                                  */
1057                                 ieee80211_handle_filtered_frame(local, sta, skb);
1058                                 rcu_read_unlock();
1059                                 return;
1060                         }
1061                 }
1062         }
1063
1064         fc = hdr->frame_control;
1065
1066         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1067             (ieee80211_is_data_qos(fc))) {
1068                 u16 tid, ssn;
1069                 u8 *qc;
1070                 sta = sta_info_get(local, hdr->addr1);
1071                 if (sta) {
1072                         qc = ieee80211_get_qos_ctl(hdr);
1073                         tid = qc[0] & 0xf;
1074                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1075                                                 & IEEE80211_SCTL_SEQ);
1076                         ieee80211_send_bar(sta->sdata, hdr->addr1,
1077                                            tid, ssn);
1078                 }
1079         }
1080
1081         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1082                 sta = sta_info_get(local, hdr->addr1);
1083                 if (sta) {
1084                         ieee80211_handle_filtered_frame(local, sta, skb);
1085                         rcu_read_unlock();
1086                         return;
1087                 }
1088         } else
1089                 rate_control_tx_status(local->mdev, skb);
1090
1091         rcu_read_unlock();
1092
1093         ieee80211_led_tx(local, 0);
1094
1095         /* SNMP counters
1096          * Fragments are passed to low-level drivers as separate skbs, so these
1097          * are actually fragments, not frames. Update frame counters only for
1098          * the first fragment of the frame. */
1099
1100         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1101         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1102
1103         if (info->flags & IEEE80211_TX_STAT_ACK) {
1104                 if (frag == 0) {
1105                         local->dot11TransmittedFrameCount++;
1106                         if (is_multicast_ether_addr(hdr->addr1))
1107                                 local->dot11MulticastTransmittedFrameCount++;
1108                         if (info->status.retry_count > 0)
1109                                 local->dot11RetryCount++;
1110                         if (info->status.retry_count > 1)
1111                                 local->dot11MultipleRetryCount++;
1112                 }
1113
1114                 /* This counter shall be incremented for an acknowledged MPDU
1115                  * with an individual address in the address 1 field or an MPDU
1116                  * with a multicast address in the address 1 field of type Data
1117                  * or Management. */
1118                 if (!is_multicast_ether_addr(hdr->addr1) ||
1119                     type == IEEE80211_FTYPE_DATA ||
1120                     type == IEEE80211_FTYPE_MGMT)
1121                         local->dot11TransmittedFragmentCount++;
1122         } else {
1123                 if (frag == 0)
1124                         local->dot11FailedCount++;
1125         }
1126
1127         /* this was a transmitted frame, but now we want to reuse it */
1128         skb_orphan(skb);
1129
1130         /*
1131          * This is a bit racy but we can avoid a lot of work
1132          * with this test...
1133          */
1134         if (!local->monitors && !local->cooked_mntrs) {
1135                 dev_kfree_skb(skb);
1136                 return;
1137         }
1138
1139         /* send frame to monitor interfaces now */
1140
1141         if (skb_headroom(skb) < sizeof(*rthdr)) {
1142                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1143                 dev_kfree_skb(skb);
1144                 return;
1145         }
1146
1147         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1148                                 skb_push(skb, sizeof(*rthdr));
1149
1150         memset(rthdr, 0, sizeof(*rthdr));
1151         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1152         rthdr->hdr.it_present =
1153                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1154                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1155
1156         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1157             !is_multicast_ether_addr(hdr->addr1))
1158                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1159
1160         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1161             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1162                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1163         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1164                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1165
1166         rthdr->data_retries = info->status.retry_count;
1167
1168         /* XXX: is this sufficient for BPF? */
1169         skb_set_mac_header(skb, 0);
1170         skb->ip_summed = CHECKSUM_UNNECESSARY;
1171         skb->pkt_type = PACKET_OTHERHOST;
1172         skb->protocol = htons(ETH_P_802_2);
1173         memset(skb->cb, 0, sizeof(skb->cb));
1174
1175         rcu_read_lock();
1176         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1177                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1178                         if (!netif_running(sdata->dev))
1179                                 continue;
1180
1181                         if (prev_dev) {
1182                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1183                                 if (skb2) {
1184                                         skb2->dev = prev_dev;
1185                                         netif_rx(skb2);
1186                                 }
1187                         }
1188
1189                         prev_dev = sdata->dev;
1190                 }
1191         }
1192         if (prev_dev) {
1193                 skb->dev = prev_dev;
1194                 netif_rx(skb);
1195                 skb = NULL;
1196         }
1197         rcu_read_unlock();
1198         dev_kfree_skb(skb);
1199 }
1200 EXPORT_SYMBOL(ieee80211_tx_status);
1201
1202 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1203                                         const struct ieee80211_ops *ops)
1204 {
1205         struct ieee80211_local *local;
1206         int priv_size;
1207         struct wiphy *wiphy;
1208
1209         /* Ensure 32-byte alignment of our private data and hw private data.
1210          * We use the wiphy priv data for both our ieee80211_local and for
1211          * the driver's private data
1212          *
1213          * In memory it'll be like this:
1214          *
1215          * +-------------------------+
1216          * | struct wiphy           |
1217          * +-------------------------+
1218          * | struct ieee80211_local  |
1219          * +-------------------------+
1220          * | driver's private data   |
1221          * +-------------------------+
1222          *
1223          */
1224         priv_size = ((sizeof(struct ieee80211_local) +
1225                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1226                     priv_data_len;
1227
1228         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1229
1230         if (!wiphy)
1231                 return NULL;
1232
1233         wiphy->privid = mac80211_wiphy_privid;
1234
1235         local = wiphy_priv(wiphy);
1236         local->hw.wiphy = wiphy;
1237
1238         local->hw.priv = (char *)local +
1239                          ((sizeof(struct ieee80211_local) +
1240                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1241
1242         BUG_ON(!ops->tx);
1243         BUG_ON(!ops->start);
1244         BUG_ON(!ops->stop);
1245         BUG_ON(!ops->config);
1246         BUG_ON(!ops->add_interface);
1247         BUG_ON(!ops->remove_interface);
1248         BUG_ON(!ops->configure_filter);
1249         local->ops = ops;
1250
1251         local->hw.queues = 1; /* default */
1252
1253         local->bridge_packets = 1;
1254
1255         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1256         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1257         local->short_retry_limit = 7;
1258         local->long_retry_limit = 4;
1259         local->hw.conf.radio_enabled = 1;
1260
1261         INIT_LIST_HEAD(&local->interfaces);
1262
1263         spin_lock_init(&local->key_lock);
1264
1265         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1266
1267         sta_info_init(local);
1268
1269         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1270                      (unsigned long)local);
1271         tasklet_disable(&local->tx_pending_tasklet);
1272
1273         tasklet_init(&local->tasklet,
1274                      ieee80211_tasklet_handler,
1275                      (unsigned long) local);
1276         tasklet_disable(&local->tasklet);
1277
1278         skb_queue_head_init(&local->skb_queue);
1279         skb_queue_head_init(&local->skb_queue_unreliable);
1280
1281         return local_to_hw(local);
1282 }
1283 EXPORT_SYMBOL(ieee80211_alloc_hw);
1284
1285 int ieee80211_register_hw(struct ieee80211_hw *hw)
1286 {
1287         struct ieee80211_local *local = hw_to_local(hw);
1288         const char *name;
1289         int result;
1290         enum ieee80211_band band;
1291         struct net_device *mdev;
1292         struct wireless_dev *mwdev;
1293
1294         /*
1295          * generic code guarantees at least one band,
1296          * set this very early because much code assumes
1297          * that hw.conf.channel is assigned
1298          */
1299         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1300                 struct ieee80211_supported_band *sband;
1301
1302                 sband = local->hw.wiphy->bands[band];
1303                 if (sband) {
1304                         /* init channel we're on */
1305                         local->hw.conf.channel =
1306                         local->oper_channel =
1307                         local->scan_channel = &sband->channels[0];
1308                         break;
1309                 }
1310         }
1311
1312         /* if low-level driver supports AP, we also support VLAN */
1313         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
1314                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
1315
1316         /* mac80211 always supports monitor */
1317         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
1318
1319         result = wiphy_register(local->hw.wiphy);
1320         if (result < 0)
1321                 return result;
1322
1323         /*
1324          * We use the number of queues for feature tests (QoS, HT) internally
1325          * so restrict them appropriately.
1326          */
1327         if (hw->queues > IEEE80211_MAX_QUEUES)
1328                 hw->queues = IEEE80211_MAX_QUEUES;
1329         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1330                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1331         if (hw->queues < 4)
1332                 hw->ampdu_queues = 0;
1333
1334         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1335                                "wmaster%d", ether_setup,
1336                                ieee80211_num_queues(hw));
1337         if (!mdev)
1338                 goto fail_mdev_alloc;
1339
1340         mwdev = netdev_priv(mdev);
1341         mdev->ieee80211_ptr = mwdev;
1342         mwdev->wiphy = local->hw.wiphy;
1343
1344         local->mdev = mdev;
1345
1346         ieee80211_rx_bss_list_init(local);
1347
1348         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1349         mdev->open = ieee80211_master_open;
1350         mdev->stop = ieee80211_master_stop;
1351         mdev->type = ARPHRD_IEEE80211;
1352         mdev->header_ops = &ieee80211_header_ops;
1353         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1354
1355         name = wiphy_dev(local->hw.wiphy)->driver->name;
1356         local->hw.workqueue = create_freezeable_workqueue(name);
1357         if (!local->hw.workqueue) {
1358                 result = -ENOMEM;
1359                 goto fail_workqueue;
1360         }
1361
1362         /*
1363          * The hardware needs headroom for sending the frame,
1364          * and we need some headroom for passing the frame to monitor
1365          * interfaces, but never both at the same time.
1366          */
1367         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1368                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1369
1370         debugfs_hw_add(local);
1371
1372         if (local->hw.conf.beacon_int < 10)
1373                 local->hw.conf.beacon_int = 100;
1374
1375         if (local->hw.max_listen_interval == 0)
1376                 local->hw.max_listen_interval = 1;
1377
1378         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1379
1380         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1381                                                   IEEE80211_HW_SIGNAL_DB |
1382                                                   IEEE80211_HW_SIGNAL_DBM) ?
1383                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1384         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1385                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1386         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1387                 local->wstats_flags |= IW_QUAL_DBM;
1388
1389         result = sta_info_start(local);
1390         if (result < 0)
1391                 goto fail_sta_info;
1392
1393         rtnl_lock();
1394         result = dev_alloc_name(local->mdev, local->mdev->name);
1395         if (result < 0)
1396                 goto fail_dev;
1397
1398         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1399         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1400
1401         result = register_netdevice(local->mdev);
1402         if (result < 0)
1403                 goto fail_dev;
1404
1405         result = ieee80211_init_rate_ctrl_alg(local,
1406                                               hw->rate_control_algorithm);
1407         if (result < 0) {
1408                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1409                        "algorithm\n", wiphy_name(local->hw.wiphy));
1410                 goto fail_rate;
1411         }
1412
1413         result = ieee80211_wep_init(local);
1414
1415         if (result < 0) {
1416                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
1417                        wiphy_name(local->hw.wiphy), result);
1418                 goto fail_wep;
1419         }
1420
1421         local->mdev->select_queue = ieee80211_select_queue;
1422
1423         /* add one default STA interface */
1424         result = ieee80211_if_add(local, "wlan%d", NULL,
1425                                   IEEE80211_IF_TYPE_STA, NULL);
1426         if (result)
1427                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1428                        wiphy_name(local->hw.wiphy));
1429
1430         rtnl_unlock();
1431
1432         ieee80211_led_init(local);
1433
1434         return 0;
1435
1436 fail_wep:
1437         rate_control_deinitialize(local);
1438 fail_rate:
1439         unregister_netdevice(local->mdev);
1440         local->mdev = NULL;
1441 fail_dev:
1442         rtnl_unlock();
1443         sta_info_stop(local);
1444 fail_sta_info:
1445         debugfs_hw_del(local);
1446         destroy_workqueue(local->hw.workqueue);
1447 fail_workqueue:
1448         if (local->mdev)
1449                 free_netdev(local->mdev);
1450 fail_mdev_alloc:
1451         wiphy_unregister(local->hw.wiphy);
1452         return result;
1453 }
1454 EXPORT_SYMBOL(ieee80211_register_hw);
1455
1456 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1457 {
1458         struct ieee80211_local *local = hw_to_local(hw);
1459
1460         tasklet_kill(&local->tx_pending_tasklet);
1461         tasklet_kill(&local->tasklet);
1462
1463         rtnl_lock();
1464
1465         /*
1466          * At this point, interface list manipulations are fine
1467          * because the driver cannot be handing us frames any
1468          * more and the tasklet is killed.
1469          */
1470
1471         /* First, we remove all virtual interfaces. */
1472         ieee80211_remove_interfaces(local);
1473
1474         /* then, finally, remove the master interface */
1475         unregister_netdevice(local->mdev);
1476
1477         rtnl_unlock();
1478
1479         ieee80211_rx_bss_list_deinit(local);
1480         ieee80211_clear_tx_pending(local);
1481         sta_info_stop(local);
1482         rate_control_deinitialize(local);
1483         debugfs_hw_del(local);
1484
1485         if (skb_queue_len(&local->skb_queue)
1486                         || skb_queue_len(&local->skb_queue_unreliable))
1487                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1488                        wiphy_name(local->hw.wiphy));
1489         skb_queue_purge(&local->skb_queue);
1490         skb_queue_purge(&local->skb_queue_unreliable);
1491
1492         destroy_workqueue(local->hw.workqueue);
1493         wiphy_unregister(local->hw.wiphy);
1494         ieee80211_wep_free(local);
1495         ieee80211_led_exit(local);
1496         free_netdev(local->mdev);
1497 }
1498 EXPORT_SYMBOL(ieee80211_unregister_hw);
1499
1500 void ieee80211_free_hw(struct ieee80211_hw *hw)
1501 {
1502         struct ieee80211_local *local = hw_to_local(hw);
1503
1504         wiphy_free(local->hw.wiphy);
1505 }
1506 EXPORT_SYMBOL(ieee80211_free_hw);
1507
1508 static int __init ieee80211_init(void)
1509 {
1510         struct sk_buff *skb;
1511         int ret;
1512
1513         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1514         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1515                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1516
1517         ret = rc80211_pid_init();
1518         if (ret)
1519                 return ret;
1520
1521         ieee80211_debugfs_netdev_init();
1522
1523         return 0;
1524 }
1525
1526 static void __exit ieee80211_exit(void)
1527 {
1528         rc80211_pid_exit();
1529
1530         /*
1531          * For key todo, it'll be empty by now but the work
1532          * might still be scheduled.
1533          */
1534         flush_scheduled_work();
1535
1536         if (mesh_allocated)
1537                 ieee80211s_stop();
1538
1539         ieee80211_debugfs_netdev_exit();
1540 }
1541
1542
1543 subsys_initcall(ieee80211_init);
1544 module_exit(ieee80211_exit);
1545
1546 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1547 MODULE_LICENSE("GPL");