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.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 static struct lock_class_key ieee80211_rx_skb_queue_class;
  37
  38 void ieee80211_configure_filter(struct ieee80211_local *local)
  39 {
  40         u64 mc;
  41         unsigned int changed_flags;
  42         unsigned int new_flags = 0;
  43
  44         if (atomic_read(&local->iff_promiscs))
  45                 new_flags |= FIF_PROMISC_IN_BSS;
  46
  47         if (atomic_read(&local->iff_allmultis))
  48                 new_flags |= FIF_ALLMULTI;
  49
  50         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  51             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  52                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  53
  54         if (local->fif_probe_req || local->probe_req_reg)
  55                 new_flags |= FIF_PROBE_REQ;
  56
  57         if (local->fif_fcsfail)
  58                 new_flags |= FIF_FCSFAIL;
  59
  60         if (local->fif_plcpfail)
  61                 new_flags |= FIF_PLCPFAIL;
  62
  63         if (local->fif_control)
  64                 new_flags |= FIF_CONTROL;
  65
  66         if (local->fif_other_bss)
  67                 new_flags |= FIF_OTHER_BSS;
  68
  69         if (local->fif_pspoll)
  70                 new_flags |= FIF_PSPOLL;
  71
  72         spin_lock_bh(&local->filter_lock);
  73         changed_flags = local->filter_flags ^ new_flags;
  74
  75         mc = drv_prepare_multicast(local, &local->mc_list);
  76         spin_unlock_bh(&local->filter_lock);
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         drv_configure_filter(local, changed_flags, &new_flags, mc);
  82
  83         WARN_ON(new_flags & (1<<31));
  84
  85         local->filter_flags = new_flags & ~(1<<31);
  86 }
  87
  88 static void ieee80211_reconfig_filter(struct work_struct *work)
  89 {
  90         struct ieee80211_local *local =
  91                 container_of(work, struct ieee80211_local, reconfig_filter);
  92
  93         ieee80211_configure_filter(local);
  94 }
  95
  96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  97 {
  98         struct ieee80211_channel *chan;
  99         int ret = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102         u32 offchannel_flag;
 103
 104         might_sleep();
 105
 106         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 107         if (local->scan_channel) {
 108                 chan = local->scan_channel;
 109                 /* If scanning on oper channel, use whatever channel-type
 110                  * is currently in use.
 111                  */
 112                 if (chan == local->oper_channel)
 113                         channel_type = local->_oper_channel_type;
 114                 else
 115                         channel_type = NL80211_CHAN_NO_HT;
 116         } else if (local->tmp_channel) {
 117                 chan = local->tmp_channel;
 118                 channel_type = local->tmp_channel_type;
 119         } else {
 120                 chan = local->oper_channel;
 121                 channel_type = local->_oper_channel_type;
 122         }
 123
 124         if (chan != local->oper_channel ||
 125             channel_type != local->_oper_channel_type)
 126                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 127         else
 128                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 129
 130         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 131
 132         if (offchannel_flag || chan != local->hw.conf.channel ||
 133             channel_type != local->hw.conf.channel_type) {
 134                 local->hw.conf.channel = chan;
 135                 local->hw.conf.channel_type = channel_type;
 136                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 137         }
 138
 139         if (!conf_is_ht(&local->hw.conf)) {
 140                 /*
 141                  * mac80211.h documents that this is only valid
 142                  * when the channel is set to an HT type, and
 143                  * that otherwise STATIC is used.
 144                  */
 145                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 146         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 147                 local->hw.conf.smps_mode = local->smps_mode;
 148                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 149         }
 150
 151         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 152             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 153             test_bit(SCAN_HW_SCANNING, &local->scanning))
 154                 power = chan->max_power;
 155         else
 156                 power = local->power_constr_level ?
 157                         min(chan->max_power,
 158                                 (chan->max_reg_power  - local->power_constr_level)) :
 159                         chan->max_power;
 160
 161         if (local->user_power_level >= 0)
 162                 power = min(power, local->user_power_level);
 163
 164         if (local->hw.conf.power_level != power) {
 165                 changed |= IEEE80211_CONF_CHANGE_POWER;
 166                 local->hw.conf.power_level = power;
 167         }
 168
 169         if (changed && local->open_count) {
 170                 ret = drv_config(local, changed);
 171                 /*
 172                  * Goal:
 173                  * HW reconfiguration should never fail, the driver has told
 174                  * us what it can support so it should live up to that promise.
 175                  *
 176                  * Current status:
 177                  * rfkill is not integrated with mac80211 and a
 178                  * configuration command can thus fail if hardware rfkill
 179                  * is enabled
 180                  *
 181                  * FIXME: integrate rfkill with mac80211 and then add this
 182                  * WARN_ON() back
 183                  *
 184                  */
 185                 /* WARN_ON(ret); */
 186         }
 187
 188         return ret;
 189 }
 190
 191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 192                                       u32 changed)
 193 {
 194         struct ieee80211_local *local = sdata->local;
 195         static const u8 zero[ETH_ALEN] = { 0 };
 196
 197         if (!changed)
 198                 return;
 199
 200         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 201                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 202         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 203                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 204         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 205                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 206         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 207                 sdata->vif.bss_conf.bssid = NULL;
 208         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 209                 sdata->vif.bss_conf.bssid = zero;
 210         } else {
 211                 WARN_ON(1);
 212                 return;
 213         }
 214
 215         switch (sdata->vif.type) {
 216         case NL80211_IFTYPE_AP:
 217         case NL80211_IFTYPE_ADHOC:
 218         case NL80211_IFTYPE_WDS:
 219         case NL80211_IFTYPE_MESH_POINT:
 220                 break;
 221         default:
 222                 /* do not warn to simplify caller in scan.c */
 223                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 224                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 225                         return;
 226                 break;
 227         }
 228
 229         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 230                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 231                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 232                         sdata->vif.bss_conf.enable_beacon = false;
 233                 } else {
 234                         /*
 235                          * Beacon should be enabled, but AP mode must
 236                          * check whether there is a beacon configured.
 237                          */
 238                         switch (sdata->vif.type) {
 239                         case NL80211_IFTYPE_AP:
 240                                 sdata->vif.bss_conf.enable_beacon =
 241                                         !!sdata->u.ap.beacon;
 242                                 break;
 243                         case NL80211_IFTYPE_ADHOC:
 244                                 sdata->vif.bss_conf.enable_beacon =
 245                                         !!sdata->u.ibss.presp;
 246                                 break;
 247 #ifdef CONFIG_MAC80211_MESH
 248                         case NL80211_IFTYPE_MESH_POINT:
 249                                 sdata->vif.bss_conf.enable_beacon =
 250                                         !!sdata->u.mesh.mesh_id_len;
 251                                 break;
 252 #endif
 253                         default:
 254                                 /* not reached */
 255                                 WARN_ON(1);
 256                                 break;
 257                         }
 258                 }
 259         }
 260
 261         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 262 }
 263
 264 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 265 {
 266         sdata->vif.bss_conf.use_cts_prot = false;
 267         sdata->vif.bss_conf.use_short_preamble = false;
 268         sdata->vif.bss_conf.use_short_slot = false;
 269         return BSS_CHANGED_ERP_CTS_PROT |
 270                BSS_CHANGED_ERP_PREAMBLE |
 271                BSS_CHANGED_ERP_SLOT;
 272 }
 273
 274 static void ieee80211_tasklet_handler(unsigned long data)
 275 {
 276         struct ieee80211_local *local = (struct ieee80211_local *) data;
 277         struct sta_info *sta, *tmp;
 278         struct skb_eosp_msg_data *eosp_data;
 279         struct sk_buff *skb;
 280
 281         while ((skb = skb_dequeue(&local->skb_queue)) ||
 282                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 283                 switch (skb->pkt_type) {
 284                 case IEEE80211_RX_MSG:
 285                         /* Clear skb->pkt_type in order to not confuse kernel
 286                          * netstack. */
 287                         skb->pkt_type = 0;
 288                         ieee80211_rx(&local->hw, skb);
 289                         break;
 290                 case IEEE80211_TX_STATUS_MSG:
 291                         skb->pkt_type = 0;
 292                         ieee80211_tx_status(&local->hw, skb);
 293                         break;
 294                 case IEEE80211_EOSP_MSG:
 295                         eosp_data = (void *)skb->cb;
 296                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 297                                 /* skip wrong virtual interface */
 298                                 if (memcmp(eosp_data->iface,
 299                                            sta->sdata->vif.addr, ETH_ALEN))
 300                                         continue;
 301                                 clear_sta_flag(sta, WLAN_STA_SP);
 302                                 break;
 303                         }
 304                         dev_kfree_skb(skb);
 305                         break;
 306                 default:
 307                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 308                              skb->pkt_type);
 309                         dev_kfree_skb(skb);
 310                         break;
 311                 }
 312         }
 313 }
 314
 315 static void ieee80211_restart_work(struct work_struct *work)
 316 {
 317         struct ieee80211_local *local =
 318                 container_of(work, struct ieee80211_local, restart_work);
 319
 320         /* wait for scan work complete */
 321         flush_workqueue(local->workqueue);
 322
 323         mutex_lock(&local->mtx);
 324         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 325              rcu_dereference_protected(local->sched_scan_sdata,
 326                                        lockdep_is_held(&local->mtx)),
 327                 "%s called with hardware scan in progress\n", __func__);
 328         mutex_unlock(&local->mtx);
 329
 330         rtnl_lock();
 331         ieee80211_scan_cancel(local);
 332         ieee80211_reconfig(local);
 333         rtnl_unlock();
 334 }
 335
 336 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 337 {
 338         struct ieee80211_local *local = hw_to_local(hw);
 339
 340         trace_api_restart_hw(local);
 341
 342         wiphy_info(hw->wiphy,
 343                    "Hardware restart was requested\n");
 344
 345         /* use this reason, ieee80211_reconfig will unblock it */
 346         ieee80211_stop_queues_by_reason(hw,
 347                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 348
 349         /*
 350          * Stop all Rx during the reconfig. We don't want state changes
 351          * or driver callbacks while this is in progress.
 352          */
 353         local->in_reconfig = true;
 354         barrier();
 355
 356         schedule_work(&local->restart_work);
 357 }
 358 EXPORT_SYMBOL(ieee80211_restart_hw);
 359
 360 static void ieee80211_recalc_smps_work(struct work_struct *work)
 361 {
 362         struct ieee80211_local *local =
 363                 container_of(work, struct ieee80211_local, recalc_smps);
 364
 365         mutex_lock(&local->iflist_mtx);
 366         ieee80211_recalc_smps(local);
 367         mutex_unlock(&local->iflist_mtx);
 368 }
 369
 370 #ifdef CONFIG_INET
 371 static int ieee80211_ifa_changed(struct notifier_block *nb,
 372                                  unsigned long data, void *arg)
 373 {
 374         struct in_ifaddr *ifa = arg;
 375         struct ieee80211_local *local =
 376                 container_of(nb, struct ieee80211_local,
 377                              ifa_notifier);
 378         struct net_device *ndev = ifa->ifa_dev->dev;
 379         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 380         struct in_device *idev;
 381         struct ieee80211_sub_if_data *sdata;
 382         struct ieee80211_bss_conf *bss_conf;
 383         struct ieee80211_if_managed *ifmgd;
 384         int c = 0;
 385
 386         /* Make sure it's our interface that got changed */
 387         if (!wdev)
 388                 return NOTIFY_DONE;
 389
 390         if (wdev->wiphy != local->hw.wiphy)
 391                 return NOTIFY_DONE;
 392
 393         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 394         bss_conf = &sdata->vif.bss_conf;
 395
 396         /* ARP filtering is only supported in managed mode */
 397         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 398                 return NOTIFY_DONE;
 399
 400         idev = __in_dev_get_rtnl(sdata->dev);
 401         if (!idev)
 402                 return NOTIFY_DONE;
 403
 404         ifmgd = &sdata->u.mgd;
 405         mutex_lock(&ifmgd->mtx);
 406
 407         /* Copy the addresses to the bss_conf list */
 408         ifa = idev->ifa_list;
 409         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 410                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 411                 ifa = ifa->ifa_next;
 412                 c++;
 413         }
 414
 415         /* If not all addresses fit the list, disable filtering */
 416         if (ifa) {
 417                 sdata->arp_filter_state = false;
 418                 c = 0;
 419         } else {
 420                 sdata->arp_filter_state = true;
 421         }
 422         bss_conf->arp_addr_cnt = c;
 423
 424         /* Configure driver only if associated (which also implies it is up) */
 425         if (ifmgd->associated) {
 426                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 427                 ieee80211_bss_info_change_notify(sdata,
 428                                                  BSS_CHANGED_ARP_FILTER);
 429         }
 430
 431         mutex_unlock(&ifmgd->mtx);
 432
 433         return NOTIFY_DONE;
 434 }
 435 #endif
 436
 437 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 438 {
 439         struct ieee80211_local *local =
 440                 container_of(napi, struct ieee80211_local, napi);
 441
 442         return local->ops->napi_poll(&local->hw, budget);
 443 }
 444
 445 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 446 {
 447         struct ieee80211_local *local = hw_to_local(hw);
 448
 449         napi_schedule(&local->napi);
 450 }
 451 EXPORT_SYMBOL(ieee80211_napi_schedule);
 452
 453 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 454 {
 455         struct ieee80211_local *local = hw_to_local(hw);
 456
 457         napi_complete(&local->napi);
 458 }
 459 EXPORT_SYMBOL(ieee80211_napi_complete);
 460
 461 /* There isn't a lot of sense in it, but you can transmit anything you like */
 462 static const struct ieee80211_txrx_stypes
 463 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 464         [NL80211_IFTYPE_ADHOC] = {
 465                 .tx = 0xffff,
 466                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 467                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 468                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 469         },
 470         [NL80211_IFTYPE_STATION] = {
 471                 .tx = 0xffff,
 472                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 474         },
 475         [NL80211_IFTYPE_AP] = {
 476                 .tx = 0xffff,
 477                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 478                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 479                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 480                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 481                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 482                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 483                         BIT(IEEE80211_STYPE_ACTION >> 4),
 484         },
 485         [NL80211_IFTYPE_AP_VLAN] = {
 486                 /* copy AP */
 487                 .tx = 0xffff,
 488                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 489                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 490                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 491                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 492                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 493                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 494                         BIT(IEEE80211_STYPE_ACTION >> 4),
 495         },
 496         [NL80211_IFTYPE_P2P_CLIENT] = {
 497                 .tx = 0xffff,
 498                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 499                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 500         },
 501         [NL80211_IFTYPE_P2P_GO] = {
 502                 .tx = 0xffff,
 503                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 504                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 505                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 506                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 507                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 508                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 509                         BIT(IEEE80211_STYPE_ACTION >> 4),
 510         },
 511         [NL80211_IFTYPE_MESH_POINT] = {
 512                 .tx = 0xffff,
 513                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 514                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 515                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 516         },
 517 };
 518
 519 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 520         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 521                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 522
 523         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 524                                 IEEE80211_HT_CAP_MAX_AMSDU |
 525                                 IEEE80211_HT_CAP_SGI_40),
 526         .mcs = {
 527                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 528                              0xff, 0xff, 0xff, 0xff, 0xff, },
 529         },
 530 };
 531
 532 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 533                                         const struct ieee80211_ops *ops)
 534 {
 535         struct ieee80211_local *local;
 536         int priv_size, i;
 537         struct wiphy *wiphy;
 538
 539         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 540                 return NULL;
 541
 542         /* Ensure 32-byte alignment of our private data and hw private data.
 543          * We use the wiphy priv data for both our ieee80211_local and for
 544          * the driver's private data
 545          *
 546          * In memory it'll be like this:
 547          *
 548          * +-------------------------+
 549          * | struct wiphy           |
 550          * +-------------------------+
 551          * | struct ieee80211_local  |
 552          * +-------------------------+
 553          * | driver's private data   |
 554          * +-------------------------+
 555          *
 556          */
 557         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 558
 559         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 560
 561         if (!wiphy)
 562                 return NULL;
 563
 564         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 565
 566         wiphy->privid = mac80211_wiphy_privid;
 567
 568         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 569                         WIPHY_FLAG_4ADDR_AP |
 570                         WIPHY_FLAG_4ADDR_STATION |
 571                         WIPHY_FLAG_REPORTS_OBSS |
 572                         WIPHY_FLAG_OFFCHAN_TX;
 573
 574         if (ops->remain_on_channel)
 575                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 576
 577         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 578                           NL80211_FEATURE_HT_IBSS;
 579
 580         if (!ops->set_key)
 581                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 582
 583         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 584
 585         local = wiphy_priv(wiphy);
 586
 587         local->hw.wiphy = wiphy;
 588
 589         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 590
 591         BUG_ON(!ops->tx);
 592         BUG_ON(!ops->start);
 593         BUG_ON(!ops->stop);
 594         BUG_ON(!ops->config);
 595         BUG_ON(!ops->add_interface);
 596         BUG_ON(!ops->remove_interface);
 597         BUG_ON(!ops->configure_filter);
 598         local->ops = ops;
 599
 600         /* set up some defaults */
 601         local->hw.queues = 1;
 602         local->hw.max_rates = 1;
 603         local->hw.max_report_rates = 0;
 604         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 605         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 606         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 607         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 608         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 609         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 610                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 611                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 612         local->user_power_level = -1;
 613         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 614
 615         INIT_LIST_HEAD(&local->interfaces);
 616
 617         __hw_addr_init(&local->mc_list);
 618
 619         mutex_init(&local->iflist_mtx);
 620         mutex_init(&local->mtx);
 621
 622         mutex_init(&local->key_mtx);
 623         spin_lock_init(&local->filter_lock);
 624         spin_lock_init(&local->queue_stop_reason_lock);
 625
 626         /*
 627          * The rx_skb_queue is only accessed from tasklets,
 628          * but other SKB queues are used from within IRQ
 629          * context. Therefore, this one needs a different
 630          * locking class so our direct, non-irq-safe use of
 631          * the queue's lock doesn't throw lockdep warnings.
 632          */
 633         skb_queue_head_init_class(&local->rx_skb_queue,
 634                                   &ieee80211_rx_skb_queue_class);
 635
 636         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 637
 638         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 639
 640         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 641         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 642         local->smps_mode = IEEE80211_SMPS_OFF;
 643
 644         INIT_WORK(&local->dynamic_ps_enable_work,
 645                   ieee80211_dynamic_ps_enable_work);
 646         INIT_WORK(&local->dynamic_ps_disable_work,
 647                   ieee80211_dynamic_ps_disable_work);
 648         setup_timer(&local->dynamic_ps_timer,
 649                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 650
 651         INIT_WORK(&local->sched_scan_stopped_work,
 652                   ieee80211_sched_scan_stopped_work);
 653
 654         spin_lock_init(&local->ack_status_lock);
 655         idr_init(&local->ack_status_frames);
 656         /* preallocate at least one entry */
 657         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 658
 659         sta_info_init(local);
 660
 661         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 662                 skb_queue_head_init(&local->pending[i]);
 663                 atomic_set(&local->agg_queue_stop[i], 0);
 664         }
 665         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 666                      (unsigned long)local);
 667
 668         tasklet_init(&local->tasklet,
 669                      ieee80211_tasklet_handler,
 670                      (unsigned long) local);
 671
 672         skb_queue_head_init(&local->skb_queue);
 673         skb_queue_head_init(&local->skb_queue_unreliable);
 674
 675         /* init dummy netdev for use w/ NAPI */
 676         init_dummy_netdev(&local->napi_dev);
 677
 678         ieee80211_led_names(local);
 679
 680         ieee80211_roc_setup(local);
 681
 682         return &local->hw;
 683 }
 684 EXPORT_SYMBOL(ieee80211_alloc_hw);
 685
 686 int ieee80211_register_hw(struct ieee80211_hw *hw)
 687 {
 688         struct ieee80211_local *local = hw_to_local(hw);
 689         int result, i;
 690         enum ieee80211_band band;
 691         int channels, max_bitrates;
 692         bool supp_ht, supp_vht;
 693         netdev_features_t feature_whitelist;
 694         static const u32 cipher_suites[] = {
 695                 /* keep WEP first, it may be removed below */
 696                 WLAN_CIPHER_SUITE_WEP40,
 697                 WLAN_CIPHER_SUITE_WEP104,
 698                 WLAN_CIPHER_SUITE_TKIP,
 699                 WLAN_CIPHER_SUITE_CCMP,
 700
 701                 /* keep last -- depends on hw flags! */
 702                 WLAN_CIPHER_SUITE_AES_CMAC
 703         };
 704
 705         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 706             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 707              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 708                 return -EINVAL;
 709
 710 #ifdef CONFIG_PM
 711         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 712             (!local->ops->suspend || !local->ops->resume))
 713                 return -EINVAL;
 714 #endif
 715
 716         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 717                 return -EINVAL;
 718
 719         /* Only HW csum features are currently compatible with mac80211 */
 720         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 721                             NETIF_F_HW_CSUM;
 722         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 723                 return -EINVAL;
 724
 725         if (hw->max_report_rates == 0)
 726                 hw->max_report_rates = hw->max_rates;
 727
 728         /*
 729          * generic code guarantees at least one band,
 730          * set this very early because much code assumes
 731          * that hw.conf.channel is assigned
 732          */
 733         channels = 0;
 734         max_bitrates = 0;
 735         supp_ht = false;
 736         supp_vht = false;
 737         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 738                 struct ieee80211_supported_band *sband;
 739
 740                 sband = local->hw.wiphy->bands[band];
 741                 if (!sband)
 742                         continue;
 743                 if (!local->oper_channel) {
 744                         /* init channel we're on */
 745                         local->hw.conf.channel =
 746                         local->oper_channel = &sband->channels[0];
 747                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 748                 }
 749                 channels += sband->n_channels;
 750
 751                 if (max_bitrates < sband->n_bitrates)
 752                         max_bitrates = sband->n_bitrates;
 753                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 754                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 755         }
 756
 757         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 758                                       sizeof(void *) * channels, GFP_KERNEL);
 759         if (!local->int_scan_req)
 760                 return -ENOMEM;
 761
 762         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 763                 if (!local->hw.wiphy->bands[band])
 764                         continue;
 765                 local->int_scan_req->rates[band] = (u32) -1;
 766         }
 767
 768         /* if low-level driver supports AP, we also support VLAN */
 769         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 770                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 771                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 772         }
 773
 774         /* mac80211 always supports monitor */
 775         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 776         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 777
 778         /*
 779          * mac80211 doesn't support more than 1 channel, and also not more
 780          * than one IBSS interface
 781          */
 782         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 783                 const struct ieee80211_iface_combination *c;
 784                 int j;
 785
 786                 c = &hw->wiphy->iface_combinations[i];
 787
 788                 if (c->num_different_channels > 1)
 789                         return -EINVAL;
 790
 791                 for (j = 0; j < c->n_limits; j++)
 792                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 793                             c->limits[j].max > 1)
 794                                 return -EINVAL;
 795         }
 796
 797 #ifndef CONFIG_MAC80211_MESH
 798         /* mesh depends on Kconfig, but drivers should set it if they want */
 799         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 800 #endif
 801
 802         /* if the underlying driver supports mesh, mac80211 will (at least)
 803          * provide routing of mesh authentication frames to userspace */
 804         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 805                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 806
 807         /* mac80211 supports control port protocol changing */
 808         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 809
 810         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 811                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 812         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 813                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 814
 815         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 816              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 817              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 818
 819         /*
 820          * Calculate scan IE length -- we need this to alloc
 821          * memory and to subtract from the driver limit. It
 822          * includes the DS Params, (extended) supported rates, and HT
 823          * information -- SSID is the driver's responsibility.
 824          */
 825         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 826                 3 /* DS Params */;
 827         if (supp_ht)
 828                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 829
 830         if (supp_vht)
 831                 local->scan_ies_len +=
 832                         2 + sizeof(struct ieee80211_vht_capabilities);
 833
 834         if (!local->ops->hw_scan) {
 835                 /* For hw_scan, driver needs to set these up. */
 836                 local->hw.wiphy->max_scan_ssids = 4;
 837                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 838         }
 839
 840         /*
 841          * If the driver supports any scan IEs, then assume the
 842          * limit includes the IEs mac80211 will add, otherwise
 843          * leave it at zero and let the driver sort it out; we
 844          * still pass our IEs to the driver but userspace will
 845          * not be allowed to in that case.
 846          */
 847         if (local->hw.wiphy->max_scan_ie_len)
 848                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 849
 850         /* Set up cipher suites unless driver already did */
 851         if (!local->hw.wiphy->cipher_suites) {
 852                 local->hw.wiphy->cipher_suites = cipher_suites;
 853                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 854                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 855                         local->hw.wiphy->n_cipher_suites--;
 856         }
 857         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 858                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 859                         local->hw.wiphy->cipher_suites += 2;
 860                         local->hw.wiphy->n_cipher_suites -= 2;
 861                 } else {
 862                         u32 *suites;
 863                         int r, w = 0;
 864
 865                         /* Filter out WEP */
 866
 867                         suites = kmemdup(
 868                                 local->hw.wiphy->cipher_suites,
 869                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 870                                 GFP_KERNEL);
 871                         if (!suites)
 872                                 return -ENOMEM;
 873                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 874                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 875                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 876                                     suite == WLAN_CIPHER_SUITE_WEP104)
 877                                         continue;
 878                                 suites[w++] = suite;
 879                         }
 880                         local->hw.wiphy->cipher_suites = suites;
 881                         local->hw.wiphy->n_cipher_suites = w;
 882                         local->wiphy_ciphers_allocated = true;
 883                 }
 884         }
 885
 886         if (!local->ops->remain_on_channel)
 887                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 888
 889         if (local->ops->sched_scan_start)
 890                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 891
 892         /* mac80211 based drivers don't support internal TDLS setup */
 893         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 894                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 895
 896         result = wiphy_register(local->hw.wiphy);
 897         if (result < 0)
 898                 goto fail_wiphy_register;
 899
 900         /*
 901          * We use the number of queues for feature tests (QoS, HT) internally
 902          * so restrict them appropriately.
 903          */
 904         if (hw->queues > IEEE80211_MAX_QUEUES)
 905                 hw->queues = IEEE80211_MAX_QUEUES;
 906
 907         local->workqueue =
 908                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 909         if (!local->workqueue) {
 910                 result = -ENOMEM;
 911                 goto fail_workqueue;
 912         }
 913
 914         /*
 915          * The hardware needs headroom for sending the frame,
 916          * and we need some headroom for passing the frame to monitor
 917          * interfaces, but never both at the same time.
 918          */
 919         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 920                                    IEEE80211_TX_STATUS_HEADROOM);
 921
 922         debugfs_hw_add(local);
 923
 924         /*
 925          * if the driver doesn't specify a max listen interval we
 926          * use 5 which should be a safe default
 927          */
 928         if (local->hw.max_listen_interval == 0)
 929                 local->hw.max_listen_interval = 5;
 930
 931         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 932
 933         local->dynamic_ps_forced_timeout = -1;
 934
 935         result = ieee80211_wep_init(local);
 936         if (result < 0)
 937                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 938                             result);
 939
 940         ieee80211_led_init(local);
 941
 942         rtnl_lock();
 943
 944         result = ieee80211_init_rate_ctrl_alg(local,
 945                                               hw->rate_control_algorithm);
 946         if (result < 0) {
 947                 wiphy_debug(local->hw.wiphy,
 948                             "Failed to initialize rate control algorithm\n");
 949                 goto fail_rate;
 950         }
 951
 952         /* add one default STA interface if supported */
 953         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 954                 result = ieee80211_if_add(local, "wlan%d", NULL,
 955                                           NL80211_IFTYPE_STATION, NULL);
 956                 if (result)
 957                         wiphy_warn(local->hw.wiphy,
 958                                    "Failed to add default virtual iface\n");
 959         }
 960
 961         rtnl_unlock();
 962
 963         local->network_latency_notifier.notifier_call =
 964                 ieee80211_max_network_latency;
 965         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 966                                      &local->network_latency_notifier);
 967         if (result) {
 968                 rtnl_lock();
 969                 goto fail_pm_qos;
 970         }
 971
 972 #ifdef CONFIG_INET
 973         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 974         result = register_inetaddr_notifier(&local->ifa_notifier);
 975         if (result)
 976                 goto fail_ifa;
 977 #endif
 978
 979         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 980                         local->hw.napi_weight);
 981
 982         return 0;
 983
 984 #ifdef CONFIG_INET
 985  fail_ifa:
 986         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 987                                &local->network_latency_notifier);
 988         rtnl_lock();
 989 #endif
 990  fail_pm_qos:
 991         ieee80211_led_exit(local);
 992         ieee80211_remove_interfaces(local);
 993  fail_rate:
 994         rtnl_unlock();
 995         ieee80211_wep_free(local);
 996         sta_info_stop(local);
 997         destroy_workqueue(local->workqueue);
 998  fail_workqueue:
 999         wiphy_unregister(local->hw.wiphy);
1000  fail_wiphy_register:
1001         if (local->wiphy_ciphers_allocated)
1002                 kfree(local->hw.wiphy->cipher_suites);
1003         kfree(local->int_scan_req);
1004         return result;
1005 }
1006 EXPORT_SYMBOL(ieee80211_register_hw);
1007
1008 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1009 {
1010         struct ieee80211_local *local = hw_to_local(hw);
1011
1012         tasklet_kill(&local->tx_pending_tasklet);
1013         tasklet_kill(&local->tasklet);
1014
1015         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1016                                &local->network_latency_notifier);
1017 #ifdef CONFIG_INET
1018         unregister_inetaddr_notifier(&local->ifa_notifier);
1019 #endif
1020
1021         rtnl_lock();
1022
1023         /*
1024          * At this point, interface list manipulations are fine
1025          * because the driver cannot be handing us frames any
1026          * more and the tasklet is killed.
1027          */
1028         ieee80211_remove_interfaces(local);
1029
1030         rtnl_unlock();
1031
1032         cancel_work_sync(&local->restart_work);
1033         cancel_work_sync(&local->reconfig_filter);
1034
1035         ieee80211_clear_tx_pending(local);
1036         rate_control_deinitialize(local);
1037
1038         if (skb_queue_len(&local->skb_queue) ||
1039             skb_queue_len(&local->skb_queue_unreliable))
1040                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1041         skb_queue_purge(&local->skb_queue);
1042         skb_queue_purge(&local->skb_queue_unreliable);
1043         skb_queue_purge(&local->rx_skb_queue);
1044
1045         destroy_workqueue(local->workqueue);
1046         wiphy_unregister(local->hw.wiphy);
1047         sta_info_stop(local);
1048         ieee80211_wep_free(local);
1049         ieee80211_led_exit(local);
1050         kfree(local->int_scan_req);
1051 }
1052 EXPORT_SYMBOL(ieee80211_unregister_hw);
1053
1054 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1055 {
1056         WARN_ONCE(1, "Have pending ack frames!\n");
1057         kfree_skb(p);
1058         return 0;
1059 }
1060
1061 void ieee80211_free_hw(struct ieee80211_hw *hw)
1062 {
1063         struct ieee80211_local *local = hw_to_local(hw);
1064
1065         mutex_destroy(&local->iflist_mtx);
1066         mutex_destroy(&local->mtx);
1067
1068         if (local->wiphy_ciphers_allocated)
1069                 kfree(local->hw.wiphy->cipher_suites);
1070
1071         idr_for_each(&local->ack_status_frames,
1072                      ieee80211_free_ack_frame, NULL);
1073         idr_destroy(&local->ack_status_frames);
1074
1075         wiphy_free(local->hw.wiphy);
1076 }
1077 EXPORT_SYMBOL(ieee80211_free_hw);
1078
1079 static int __init ieee80211_init(void)
1080 {
1081         struct sk_buff *skb;
1082         int ret;
1083
1084         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1085         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1086                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1087
1088         ret = rc80211_minstrel_init();
1089         if (ret)
1090                 return ret;
1091
1092         ret = rc80211_minstrel_ht_init();
1093         if (ret)
1094                 goto err_minstrel;
1095
1096         ret = rc80211_pid_init();
1097         if (ret)
1098                 goto err_pid;
1099
1100         ret = ieee80211_iface_init();
1101         if (ret)
1102                 goto err_netdev;
1103
1104         return 0;
1105  err_netdev:
1106         rc80211_pid_exit();
1107  err_pid:
1108         rc80211_minstrel_ht_exit();
1109  err_minstrel:
1110         rc80211_minstrel_exit();
1111
1112         return ret;
1113 }
1114
1115 static void __exit ieee80211_exit(void)
1116 {
1117         rc80211_pid_exit();
1118         rc80211_minstrel_ht_exit();
1119         rc80211_minstrel_exit();
1120
1121         if (mesh_allocated)
1122                 ieee80211s_stop();
1123
1124         ieee80211_iface_exit();
1125
1126         rcu_barrier();
1127 }
1128
1129
1130 subsys_initcall(ieee80211_init);
1131 module_exit(ieee80211_exit);
1132
1133 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1134 MODULE_LICENSE("GPL");