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 <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/pm_qos_params.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35
  36
  37 bool ieee80211_disable_40mhz_24ghz;
  38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
  39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
  40                  "Disable 40MHz support in the 2.4GHz band");
  41
  42 void ieee80211_configure_filter(struct ieee80211_local *local)
  43 {
  44         u64 mc;
  45         unsigned int changed_flags;
  46         unsigned int new_flags = 0;
  47
  48         if (atomic_read(&local->iff_promiscs))
  49                 new_flags |= FIF_PROMISC_IN_BSS;
  50
  51         if (atomic_read(&local->iff_allmultis))
  52                 new_flags |= FIF_ALLMULTI;
  53
  54         if (local->monitors || local->scanning)
  55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  56
  57         if (local->fif_probe_req || local->probe_req_reg)
  58                 new_flags |= FIF_PROBE_REQ;
  59
  60         if (local->fif_fcsfail)
  61                 new_flags |= FIF_FCSFAIL;
  62
  63         if (local->fif_plcpfail)
  64                 new_flags |= FIF_PLCPFAIL;
  65
  66         if (local->fif_control)
  67                 new_flags |= FIF_CONTROL;
  68
  69         if (local->fif_other_bss)
  70                 new_flags |= FIF_OTHER_BSS;
  71
  72         if (local->fif_pspoll)
  73                 new_flags |= FIF_PSPOLL;
  74
  75         spin_lock_bh(&local->filter_lock);
  76         changed_flags = local->filter_flags ^ new_flags;
  77
  78         mc = drv_prepare_multicast(local, &local->mc_list);
  79         spin_unlock_bh(&local->filter_lock);
  80
  81         /* be a bit nasty */
  82         new_flags |= (1<<31);
  83
  84         drv_configure_filter(local, changed_flags, &new_flags, mc);
  85
  86         WARN_ON(new_flags & (1<<31));
  87
  88         local->filter_flags = new_flags & ~(1<<31);
  89 }
  90
  91 static void ieee80211_reconfig_filter(struct work_struct *work)
  92 {
  93         struct ieee80211_local *local =
  94                 container_of(work, struct ieee80211_local, reconfig_filter);
  95
  96         ieee80211_configure_filter(local);
  97 }
  98
  99 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 100 {
 101         struct ieee80211_channel *chan, *scan_chan;
 102         int ret = 0;
 103         int power;
 104         enum nl80211_channel_type channel_type;
 105         u32 offchannel_flag;
 106
 107         might_sleep();
 108
 109         scan_chan = local->scan_channel;
 110
 111         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 112         if (scan_chan) {
 113                 chan = scan_chan;
 114                 channel_type = NL80211_CHAN_NO_HT;
 115                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 116         } else if (local->tmp_channel &&
 117                    local->oper_channel != local->tmp_channel) {
 118                 chan = scan_chan = local->tmp_channel;
 119                 channel_type = local->tmp_channel_type;
 120                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 121         } else {
 122                 chan = local->oper_channel;
 123                 channel_type = local->_oper_channel_type;
 124                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 125         }
 126         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 127
 128         if (offchannel_flag || chan != local->hw.conf.channel ||
 129             channel_type != local->hw.conf.channel_type) {
 130                 local->hw.conf.channel = chan;
 131                 local->hw.conf.channel_type = channel_type;
 132                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 133         }
 134
 135         if (!conf_is_ht(&local->hw.conf)) {
 136                 /*
 137                  * mac80211.h documents that this is only valid
 138                  * when the channel is set to an HT type, and
 139                  * that otherwise STATIC is used.
 140                  */
 141                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 142         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 143                 local->hw.conf.smps_mode = local->smps_mode;
 144                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 145         }
 146
 147         if (scan_chan)
 148                 power = chan->max_power;
 149         else
 150                 power = local->power_constr_level ?
 151                         (chan->max_power - local->power_constr_level) :
 152                         chan->max_power;
 153
 154         if (local->user_power_level >= 0)
 155                 power = min(power, local->user_power_level);
 156
 157         if (local->hw.conf.power_level != power) {
 158                 changed |= IEEE80211_CONF_CHANGE_POWER;
 159                 local->hw.conf.power_level = power;
 160         }
 161
 162         if (changed && local->open_count) {
 163                 ret = drv_config(local, changed);
 164                 /*
 165                  * Goal:
 166                  * HW reconfiguration should never fail, the driver has told
 167                  * us what it can support so it should live up to that promise.
 168                  *
 169                  * Current status:
 170                  * rfkill is not integrated with mac80211 and a
 171                  * configuration command can thus fail if hardware rfkill
 172                  * is enabled
 173                  *
 174                  * FIXME: integrate rfkill with mac80211 and then add this
 175                  * WARN_ON() back
 176                  *
 177                  */
 178                 /* WARN_ON(ret); */
 179         }
 180
 181         return ret;
 182 }
 183
 184 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 185                                       u32 changed)
 186 {
 187         struct ieee80211_local *local = sdata->local;
 188         static const u8 zero[ETH_ALEN] = { 0 };
 189
 190         if (!changed)
 191                 return;
 192
 193         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 194                 /*
 195                  * While not associated, claim a BSSID of all-zeroes
 196                  * so that drivers don't do any weird things with the
 197                  * BSSID at that time.
 198                  */
 199                 if (sdata->vif.bss_conf.assoc)
 200                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 201                 else
 202                         sdata->vif.bss_conf.bssid = zero;
 203         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 204                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 205         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 206                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 207         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 208                 sdata->vif.bss_conf.bssid = NULL;
 209         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 210                 sdata->vif.bss_conf.bssid = zero;
 211         } else {
 212                 WARN_ON(1);
 213                 return;
 214         }
 215
 216         switch (sdata->vif.type) {
 217         case NL80211_IFTYPE_AP:
 218         case NL80211_IFTYPE_ADHOC:
 219         case NL80211_IFTYPE_WDS:
 220         case NL80211_IFTYPE_MESH_POINT:
 221                 break;
 222         default:
 223                 /* do not warn to simplify caller in scan.c */
 224                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 225                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 226                         return;
 227                 break;
 228         }
 229
 230         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 231                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 232                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 233                         sdata->vif.bss_conf.enable_beacon = false;
 234                 } else {
 235                         /*
 236                          * Beacon should be enabled, but AP mode must
 237                          * check whether there is a beacon configured.
 238                          */
 239                         switch (sdata->vif.type) {
 240                         case NL80211_IFTYPE_AP:
 241                                 sdata->vif.bss_conf.enable_beacon =
 242                                         !!sdata->u.ap.beacon;
 243                                 break;
 244                         case NL80211_IFTYPE_ADHOC:
 245                                 sdata->vif.bss_conf.enable_beacon =
 246                                         !!sdata->u.ibss.presp;
 247                                 break;
 248                         case NL80211_IFTYPE_MESH_POINT:
 249                                 sdata->vif.bss_conf.enable_beacon = true;
 250                                 break;
 251                         default:
 252                                 /* not reached */
 253                                 WARN_ON(1);
 254                                 break;
 255                         }
 256                 }
 257         }
 258
 259         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 260 }
 261
 262 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 263 {
 264         sdata->vif.bss_conf.use_cts_prot = false;
 265         sdata->vif.bss_conf.use_short_preamble = false;
 266         sdata->vif.bss_conf.use_short_slot = false;
 267         return BSS_CHANGED_ERP_CTS_PROT |
 268                BSS_CHANGED_ERP_PREAMBLE |
 269                BSS_CHANGED_ERP_SLOT;
 270 }
 271
 272 static void ieee80211_tasklet_handler(unsigned long data)
 273 {
 274         struct ieee80211_local *local = (struct ieee80211_local *) data;
 275         struct sk_buff *skb;
 276
 277         while ((skb = skb_dequeue(&local->skb_queue)) ||
 278                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 279                 switch (skb->pkt_type) {
 280                 case IEEE80211_RX_MSG:
 281                         /* Clear skb->pkt_type in order to not confuse kernel
 282                          * netstack. */
 283                         skb->pkt_type = 0;
 284                         ieee80211_rx(local_to_hw(local), skb);
 285                         break;
 286                 case IEEE80211_TX_STATUS_MSG:
 287                         skb->pkt_type = 0;
 288                         ieee80211_tx_status(local_to_hw(local), skb);
 289                         break;
 290                 default:
 291                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 292                              skb->pkt_type);
 293                         dev_kfree_skb(skb);
 294                         break;
 295                 }
 296         }
 297 }
 298
 299 static void ieee80211_restart_work(struct work_struct *work)
 300 {
 301         struct ieee80211_local *local =
 302                 container_of(work, struct ieee80211_local, restart_work);
 303
 304         /* wait for scan work complete */
 305         flush_workqueue(local->workqueue);
 306
 307         mutex_lock(&local->mtx);
 308         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 309                 "%s called with hardware scan in progress\n", __func__);
 310         mutex_unlock(&local->mtx);
 311
 312         rtnl_lock();
 313         ieee80211_scan_cancel(local);
 314         ieee80211_reconfig(local);
 315         rtnl_unlock();
 316 }
 317
 318 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 319 {
 320         struct ieee80211_local *local = hw_to_local(hw);
 321
 322         trace_api_restart_hw(local);
 323
 324         /* use this reason, ieee80211_reconfig will unblock it */
 325         ieee80211_stop_queues_by_reason(hw,
 326                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 327
 328         schedule_work(&local->restart_work);
 329 }
 330 EXPORT_SYMBOL(ieee80211_restart_hw);
 331
 332 static void ieee80211_recalc_smps_work(struct work_struct *work)
 333 {
 334         struct ieee80211_local *local =
 335                 container_of(work, struct ieee80211_local, recalc_smps);
 336
 337         mutex_lock(&local->iflist_mtx);
 338         ieee80211_recalc_smps(local);
 339         mutex_unlock(&local->iflist_mtx);
 340 }
 341
 342 #ifdef CONFIG_INET
 343 static int ieee80211_ifa_changed(struct notifier_block *nb,
 344                                  unsigned long data, void *arg)
 345 {
 346         struct in_ifaddr *ifa = arg;
 347         struct ieee80211_local *local =
 348                 container_of(nb, struct ieee80211_local,
 349                              ifa_notifier);
 350         struct net_device *ndev = ifa->ifa_dev->dev;
 351         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 352         struct in_device *idev;
 353         struct ieee80211_sub_if_data *sdata;
 354         struct ieee80211_bss_conf *bss_conf;
 355         struct ieee80211_if_managed *ifmgd;
 356         int c = 0;
 357
 358         /* Make sure it's our interface that got changed */
 359         if (!wdev)
 360                 return NOTIFY_DONE;
 361
 362         if (wdev->wiphy != local->hw.wiphy)
 363                 return NOTIFY_DONE;
 364
 365         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 366         bss_conf = &sdata->vif.bss_conf;
 367
 368         if (!ieee80211_sdata_running(sdata))
 369                 return NOTIFY_DONE;
 370
 371         /* ARP filtering is only supported in managed mode */
 372         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 373                 return NOTIFY_DONE;
 374
 375         idev = __in_dev_get_rtnl(sdata->dev);
 376         if (!idev)
 377                 return NOTIFY_DONE;
 378
 379         ifmgd = &sdata->u.mgd;
 380         mutex_lock(&ifmgd->mtx);
 381
 382         /* Copy the addresses to the bss_conf list */
 383         ifa = idev->ifa_list;
 384         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 385                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 386                 ifa = ifa->ifa_next;
 387                 c++;
 388         }
 389
 390         /* If not all addresses fit the list, disable filtering */
 391         if (ifa) {
 392                 sdata->arp_filter_state = false;
 393                 c = 0;
 394         } else {
 395                 sdata->arp_filter_state = true;
 396         }
 397         bss_conf->arp_addr_cnt = c;
 398
 399         /* Configure driver only if associated */
 400         if (ifmgd->associated) {
 401                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 402                 ieee80211_bss_info_change_notify(sdata,
 403                                                  BSS_CHANGED_ARP_FILTER);
 404         }
 405
 406         mutex_unlock(&ifmgd->mtx);
 407
 408         return NOTIFY_DONE;
 409 }
 410 #endif
 411
 412 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 413 {
 414         struct ieee80211_local *local =
 415                 container_of(napi, struct ieee80211_local, napi);
 416
 417         return local->ops->napi_poll(&local->hw, budget);
 418 }
 419
 420 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 421 {
 422         struct ieee80211_local *local = hw_to_local(hw);
 423
 424         napi_schedule(&local->napi);
 425 }
 426 EXPORT_SYMBOL(ieee80211_napi_schedule);
 427
 428 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 429 {
 430         struct ieee80211_local *local = hw_to_local(hw);
 431
 432         napi_complete(&local->napi);
 433 }
 434 EXPORT_SYMBOL(ieee80211_napi_complete);
 435
 436 /* There isn't a lot of sense in it, but you can transmit anything you like */
 437 static const struct ieee80211_txrx_stypes
 438 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 439         [NL80211_IFTYPE_ADHOC] = {
 440                 .tx = 0xffff,
 441                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 442         },
 443         [NL80211_IFTYPE_STATION] = {
 444                 .tx = 0xffff,
 445                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 446                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 447         },
 448         [NL80211_IFTYPE_AP] = {
 449                 .tx = 0xffff,
 450                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 451                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 452                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 453                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 454                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 455                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 456                         BIT(IEEE80211_STYPE_ACTION >> 4),
 457         },
 458         [NL80211_IFTYPE_AP_VLAN] = {
 459                 /* copy AP */
 460                 .tx = 0xffff,
 461                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 462                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 463                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 464                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 465                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 466                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 467                         BIT(IEEE80211_STYPE_ACTION >> 4),
 468         },
 469         [NL80211_IFTYPE_P2P_CLIENT] = {
 470                 .tx = 0xffff,
 471                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 472                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 473         },
 474         [NL80211_IFTYPE_P2P_GO] = {
 475                 .tx = 0xffff,
 476                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 477                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 478                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 479                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 480                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 481                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 482                         BIT(IEEE80211_STYPE_ACTION >> 4),
 483         },
 484 };
 485
 486 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 487                                         const struct ieee80211_ops *ops)
 488 {
 489         struct ieee80211_local *local;
 490         int priv_size, i;
 491         struct wiphy *wiphy;
 492
 493         /* Ensure 32-byte alignment of our private data and hw private data.
 494          * We use the wiphy priv data for both our ieee80211_local and for
 495          * the driver's private data
 496          *
 497          * In memory it'll be like this:
 498          *
 499          * +-------------------------+
 500          * | struct wiphy           |
 501          * +-------------------------+
 502          * | struct ieee80211_local  |
 503          * +-------------------------+
 504          * | driver's private data   |
 505          * +-------------------------+
 506          *
 507          */
 508         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 509
 510         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 511
 512         if (!wiphy)
 513                 return NULL;
 514
 515         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 516
 517         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 518                         WIPHY_FLAG_4ADDR_AP |
 519                         WIPHY_FLAG_4ADDR_STATION;
 520         wiphy->privid = mac80211_wiphy_privid;
 521
 522         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 523
 524         local = wiphy_priv(wiphy);
 525
 526         local->hw.wiphy = wiphy;
 527
 528         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 529
 530         BUG_ON(!ops->tx);
 531         BUG_ON(!ops->start);
 532         BUG_ON(!ops->stop);
 533         BUG_ON(!ops->config);
 534         BUG_ON(!ops->add_interface);
 535         BUG_ON(!ops->remove_interface);
 536         BUG_ON(!ops->configure_filter);
 537         local->ops = ops;
 538
 539         /* set up some defaults */
 540         local->hw.queues = 1;
 541         local->hw.max_rates = 1;
 542         local->hw.max_report_rates = 0;
 543         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 544         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 545         local->user_power_level = -1;
 546         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 547         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 548
 549         INIT_LIST_HEAD(&local->interfaces);
 550
 551         __hw_addr_init(&local->mc_list);
 552
 553         mutex_init(&local->iflist_mtx);
 554         mutex_init(&local->mtx);
 555
 556         mutex_init(&local->key_mtx);
 557         spin_lock_init(&local->filter_lock);
 558         spin_lock_init(&local->queue_stop_reason_lock);
 559
 560         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 561
 562         ieee80211_work_init(local);
 563
 564         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 565
 566         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 567         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 568         local->smps_mode = IEEE80211_SMPS_OFF;
 569
 570         INIT_WORK(&local->dynamic_ps_enable_work,
 571                   ieee80211_dynamic_ps_enable_work);
 572         INIT_WORK(&local->dynamic_ps_disable_work,
 573                   ieee80211_dynamic_ps_disable_work);
 574         setup_timer(&local->dynamic_ps_timer,
 575                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 576
 577         sta_info_init(local);
 578
 579         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 580                 skb_queue_head_init(&local->pending[i]);
 581                 atomic_set(&local->agg_queue_stop[i], 0);
 582         }
 583         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 584                      (unsigned long)local);
 585
 586         tasklet_init(&local->tasklet,
 587                      ieee80211_tasklet_handler,
 588                      (unsigned long) local);
 589
 590         skb_queue_head_init(&local->skb_queue);
 591         skb_queue_head_init(&local->skb_queue_unreliable);
 592
 593         /* init dummy netdev for use w/ NAPI */
 594         init_dummy_netdev(&local->napi_dev);
 595
 596         return local_to_hw(local);
 597 }
 598 EXPORT_SYMBOL(ieee80211_alloc_hw);
 599
 600 int ieee80211_register_hw(struct ieee80211_hw *hw)
 601 {
 602         struct ieee80211_local *local = hw_to_local(hw);
 603         int result;
 604         enum ieee80211_band band;
 605         int channels, max_bitrates;
 606         bool supp_ht;
 607         static const u32 cipher_suites[] = {
 608                 /* keep WEP first, it may be removed below */
 609                 WLAN_CIPHER_SUITE_WEP40,
 610                 WLAN_CIPHER_SUITE_WEP104,
 611                 WLAN_CIPHER_SUITE_TKIP,
 612                 WLAN_CIPHER_SUITE_CCMP,
 613
 614                 /* keep last -- depends on hw flags! */
 615                 WLAN_CIPHER_SUITE_AES_CMAC
 616         };
 617
 618         if (hw->max_report_rates == 0)
 619                 hw->max_report_rates = hw->max_rates;
 620
 621         /*
 622          * generic code guarantees at least one band,
 623          * set this very early because much code assumes
 624          * that hw.conf.channel is assigned
 625          */
 626         channels = 0;
 627         max_bitrates = 0;
 628         supp_ht = false;
 629         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 630                 struct ieee80211_supported_band *sband;
 631
 632                 sband = local->hw.wiphy->bands[band];
 633                 if (!sband)
 634                         continue;
 635                 if (!local->oper_channel) {
 636                         /* init channel we're on */
 637                         local->hw.conf.channel =
 638                         local->oper_channel = &sband->channels[0];
 639                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 640                 }
 641                 channels += sband->n_channels;
 642
 643                 if (max_bitrates < sband->n_bitrates)
 644                         max_bitrates = sband->n_bitrates;
 645                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 646         }
 647
 648         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 649                                       sizeof(void *) * channels, GFP_KERNEL);
 650         if (!local->int_scan_req)
 651                 return -ENOMEM;
 652
 653         /* if low-level driver supports AP, we also support VLAN */
 654         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 655                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 656
 657         /* mac80211 always supports monitor */
 658         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 659
 660 #ifndef CONFIG_MAC80211_MESH
 661         /* mesh depends on Kconfig, but drivers should set it if they want */
 662         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 663 #endif
 664
 665         /* mac80211 supports control port protocol changing */
 666         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 667
 668         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 669                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 670         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 671                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 672
 673         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 674              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 675              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 676
 677         /*
 678          * Calculate scan IE length -- we need this to alloc
 679          * memory and to subtract from the driver limit. It
 680          * includes the (extended) supported rates and HT
 681          * information -- SSID is the driver's responsibility.
 682          */
 683         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 684         if (supp_ht)
 685                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 686
 687         if (!local->ops->hw_scan) {
 688                 /* For hw_scan, driver needs to set these up. */
 689                 local->hw.wiphy->max_scan_ssids = 4;
 690                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 691         }
 692
 693         /*
 694          * If the driver supports any scan IEs, then assume the
 695          * limit includes the IEs mac80211 will add, otherwise
 696          * leave it at zero and let the driver sort it out; we
 697          * still pass our IEs to the driver but userspace will
 698          * not be allowed to in that case.
 699          */
 700         if (local->hw.wiphy->max_scan_ie_len)
 701                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 702
 703         /* Set up cipher suites unless driver already did */
 704         if (!local->hw.wiphy->cipher_suites) {
 705                 local->hw.wiphy->cipher_suites = cipher_suites;
 706                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 707                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 708                         local->hw.wiphy->n_cipher_suites--;
 709         }
 710         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 711                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 712                         local->hw.wiphy->cipher_suites += 2;
 713                         local->hw.wiphy->n_cipher_suites -= 2;
 714                 } else {
 715                         u32 *suites;
 716                         int r, w = 0;
 717
 718                         /* Filter out WEP */
 719
 720                         suites = kmemdup(
 721                                 local->hw.wiphy->cipher_suites,
 722                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 723                                 GFP_KERNEL);
 724                         if (!suites)
 725                                 return -ENOMEM;
 726                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 727                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 728                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 729                                     suite == WLAN_CIPHER_SUITE_WEP104)
 730                                         continue;
 731                                 suites[w++] = suite;
 732                         }
 733                         local->hw.wiphy->cipher_suites = suites;
 734                         local->hw.wiphy->n_cipher_suites = w;
 735                         local->wiphy_ciphers_allocated = true;
 736                 }
 737         }
 738
 739         result = wiphy_register(local->hw.wiphy);
 740         if (result < 0)
 741                 goto fail_wiphy_register;
 742
 743         /*
 744          * We use the number of queues for feature tests (QoS, HT) internally
 745          * so restrict them appropriately.
 746          */
 747         if (hw->queues > IEEE80211_MAX_QUEUES)
 748                 hw->queues = IEEE80211_MAX_QUEUES;
 749
 750         local->workqueue =
 751                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 752         if (!local->workqueue) {
 753                 result = -ENOMEM;
 754                 goto fail_workqueue;
 755         }
 756
 757         /*
 758          * The hardware needs headroom for sending the frame,
 759          * and we need some headroom for passing the frame to monitor
 760          * interfaces, but never both at the same time.
 761          */
 762         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 763                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 764         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 765                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 766
 767         debugfs_hw_add(local);
 768
 769         /*
 770          * if the driver doesn't specify a max listen interval we
 771          * use 5 which should be a safe default
 772          */
 773         if (local->hw.max_listen_interval == 0)
 774                 local->hw.max_listen_interval = 5;
 775
 776         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 777
 778         local->dynamic_ps_forced_timeout = -1;
 779
 780         result = sta_info_start(local);
 781         if (result < 0)
 782                 goto fail_sta_info;
 783
 784         result = ieee80211_wep_init(local);
 785         if (result < 0)
 786                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 787                             result);
 788
 789         rtnl_lock();
 790
 791         result = ieee80211_init_rate_ctrl_alg(local,
 792                                               hw->rate_control_algorithm);
 793         if (result < 0) {
 794                 wiphy_debug(local->hw.wiphy,
 795                             "Failed to initialize rate control algorithm\n");
 796                 goto fail_rate;
 797         }
 798
 799         /* add one default STA interface if supported */
 800         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 801                 result = ieee80211_if_add(local, "wlan%d", NULL,
 802                                           NL80211_IFTYPE_STATION, NULL);
 803                 if (result)
 804                         wiphy_warn(local->hw.wiphy,
 805                                    "Failed to add default virtual iface\n");
 806         }
 807
 808         rtnl_unlock();
 809
 810         ieee80211_led_init(local);
 811
 812         local->network_latency_notifier.notifier_call =
 813                 ieee80211_max_network_latency;
 814         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 815                                      &local->network_latency_notifier);
 816         if (result) {
 817                 rtnl_lock();
 818                 goto fail_pm_qos;
 819         }
 820
 821 #ifdef CONFIG_INET
 822         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 823         result = register_inetaddr_notifier(&local->ifa_notifier);
 824         if (result)
 825                 goto fail_ifa;
 826 #endif
 827
 828         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 829                         local->hw.napi_weight);
 830
 831         return 0;
 832
 833 #ifdef CONFIG_INET
 834  fail_ifa:
 835         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 836                                &local->network_latency_notifier);
 837         rtnl_lock();
 838 #endif
 839  fail_pm_qos:
 840         ieee80211_led_exit(local);
 841         ieee80211_remove_interfaces(local);
 842  fail_rate:
 843         rtnl_unlock();
 844         ieee80211_wep_free(local);
 845         sta_info_stop(local);
 846  fail_sta_info:
 847         destroy_workqueue(local->workqueue);
 848  fail_workqueue:
 849         wiphy_unregister(local->hw.wiphy);
 850  fail_wiphy_register:
 851         if (local->wiphy_ciphers_allocated)
 852                 kfree(local->hw.wiphy->cipher_suites);
 853         kfree(local->int_scan_req);
 854         return result;
 855 }
 856 EXPORT_SYMBOL(ieee80211_register_hw);
 857
 858 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 859 {
 860         struct ieee80211_local *local = hw_to_local(hw);
 861
 862         tasklet_kill(&local->tx_pending_tasklet);
 863         tasklet_kill(&local->tasklet);
 864
 865         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 866                                &local->network_latency_notifier);
 867 #ifdef CONFIG_INET
 868         unregister_inetaddr_notifier(&local->ifa_notifier);
 869 #endif
 870
 871         rtnl_lock();
 872
 873         /*
 874          * At this point, interface list manipulations are fine
 875          * because the driver cannot be handing us frames any
 876          * more and the tasklet is killed.
 877          */
 878         ieee80211_remove_interfaces(local);
 879
 880         rtnl_unlock();
 881
 882         /*
 883          * Now all work items will be gone, but the
 884          * timer might still be armed, so delete it
 885          */
 886         del_timer_sync(&local->work_timer);
 887
 888         cancel_work_sync(&local->restart_work);
 889         cancel_work_sync(&local->reconfig_filter);
 890
 891         ieee80211_clear_tx_pending(local);
 892         sta_info_stop(local);
 893         rate_control_deinitialize(local);
 894
 895         if (skb_queue_len(&local->skb_queue) ||
 896             skb_queue_len(&local->skb_queue_unreliable))
 897                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
 898         skb_queue_purge(&local->skb_queue);
 899         skb_queue_purge(&local->skb_queue_unreliable);
 900
 901         destroy_workqueue(local->workqueue);
 902         wiphy_unregister(local->hw.wiphy);
 903         ieee80211_wep_free(local);
 904         ieee80211_led_exit(local);
 905         kfree(local->int_scan_req);
 906 }
 907 EXPORT_SYMBOL(ieee80211_unregister_hw);
 908
 909 void ieee80211_free_hw(struct ieee80211_hw *hw)
 910 {
 911         struct ieee80211_local *local = hw_to_local(hw);
 912
 913         mutex_destroy(&local->iflist_mtx);
 914         mutex_destroy(&local->mtx);
 915
 916         if (local->wiphy_ciphers_allocated)
 917                 kfree(local->hw.wiphy->cipher_suites);
 918
 919         wiphy_free(local->hw.wiphy);
 920 }
 921 EXPORT_SYMBOL(ieee80211_free_hw);
 922
 923 static int __init ieee80211_init(void)
 924 {
 925         struct sk_buff *skb;
 926         int ret;
 927
 928         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 929         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 930                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 931
 932         ret = rc80211_minstrel_init();
 933         if (ret)
 934                 return ret;
 935
 936         ret = rc80211_minstrel_ht_init();
 937         if (ret)
 938                 goto err_minstrel;
 939
 940         ret = rc80211_pid_init();
 941         if (ret)
 942                 goto err_pid;
 943
 944         ret = ieee80211_iface_init();
 945         if (ret)
 946                 goto err_netdev;
 947
 948         return 0;
 949  err_netdev:
 950         rc80211_pid_exit();
 951  err_pid:
 952         rc80211_minstrel_ht_exit();
 953  err_minstrel:
 954         rc80211_minstrel_exit();
 955
 956         return ret;
 957 }
 958
 959 static void __exit ieee80211_exit(void)
 960 {
 961         rc80211_pid_exit();
 962         rc80211_minstrel_ht_exit();
 963         rc80211_minstrel_exit();
 964
 965         /*
 966          * For key todo, it'll be empty by now but the work
 967          * might still be scheduled.
 968          */
 969         flush_scheduled_work();
 970
 971         if (mesh_allocated)
 972                 ieee80211s_stop();
 973
 974         ieee80211_iface_exit();
 975 }
 976
 977
 978 subsys_initcall(ieee80211_init);
 979 module_exit(ieee80211_exit);
 980
 981 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 982 MODULE_LICENSE("GPL");