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 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 211                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 212                 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
 213                           "P2P Device BSS changed %#x", changed);
 214         } else {
 215                 WARN_ON(1);
 216                 return;
 217         }
 218
 219         switch (sdata->vif.type) {
 220         case NL80211_IFTYPE_AP:
 221         case NL80211_IFTYPE_ADHOC:
 222         case NL80211_IFTYPE_WDS:
 223         case NL80211_IFTYPE_MESH_POINT:
 224                 break;
 225         default:
 226                 /* do not warn to simplify caller in scan.c */
 227                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 228                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 229                         return;
 230                 break;
 231         }
 232
 233         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 234                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 235                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 236                         sdata->vif.bss_conf.enable_beacon = false;
 237                 } else {
 238                         /*
 239                          * Beacon should be enabled, but AP mode must
 240                          * check whether there is a beacon configured.
 241                          */
 242                         switch (sdata->vif.type) {
 243                         case NL80211_IFTYPE_AP:
 244                                 sdata->vif.bss_conf.enable_beacon =
 245                                         !!sdata->u.ap.beacon;
 246                                 break;
 247                         case NL80211_IFTYPE_ADHOC:
 248                                 sdata->vif.bss_conf.enable_beacon =
 249                                         !!sdata->u.ibss.presp;
 250                                 break;
 251 #ifdef CONFIG_MAC80211_MESH
 252                         case NL80211_IFTYPE_MESH_POINT:
 253                                 sdata->vif.bss_conf.enable_beacon =
 254                                         !!sdata->u.mesh.mesh_id_len;
 255                                 break;
 256 #endif
 257                         default:
 258                                 /* not reached */
 259                                 WARN_ON(1);
 260                                 break;
 261                         }
 262                 }
 263         }
 264
 265         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 266 }
 267
 268 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 269 {
 270         sdata->vif.bss_conf.use_cts_prot = false;
 271         sdata->vif.bss_conf.use_short_preamble = false;
 272         sdata->vif.bss_conf.use_short_slot = false;
 273         return BSS_CHANGED_ERP_CTS_PROT |
 274                BSS_CHANGED_ERP_PREAMBLE |
 275                BSS_CHANGED_ERP_SLOT;
 276 }
 277
 278 static void ieee80211_tasklet_handler(unsigned long data)
 279 {
 280         struct ieee80211_local *local = (struct ieee80211_local *) data;
 281         struct sta_info *sta, *tmp;
 282         struct skb_eosp_msg_data *eosp_data;
 283         struct sk_buff *skb;
 284
 285         while ((skb = skb_dequeue(&local->skb_queue)) ||
 286                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 287                 switch (skb->pkt_type) {
 288                 case IEEE80211_RX_MSG:
 289                         /* Clear skb->pkt_type in order to not confuse kernel
 290                          * netstack. */
 291                         skb->pkt_type = 0;
 292                         ieee80211_rx(&local->hw, skb);
 293                         break;
 294                 case IEEE80211_TX_STATUS_MSG:
 295                         skb->pkt_type = 0;
 296                         ieee80211_tx_status(&local->hw, skb);
 297                         break;
 298                 case IEEE80211_EOSP_MSG:
 299                         eosp_data = (void *)skb->cb;
 300                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 301                                 /* skip wrong virtual interface */
 302                                 if (memcmp(eosp_data->iface,
 303                                            sta->sdata->vif.addr, ETH_ALEN))
 304                                         continue;
 305                                 clear_sta_flag(sta, WLAN_STA_SP);
 306                                 break;
 307                         }
 308                         dev_kfree_skb(skb);
 309                         break;
 310                 default:
 311                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 312                              skb->pkt_type);
 313                         dev_kfree_skb(skb);
 314                         break;
 315                 }
 316         }
 317 }
 318
 319 static void ieee80211_restart_work(struct work_struct *work)
 320 {
 321         struct ieee80211_local *local =
 322                 container_of(work, struct ieee80211_local, restart_work);
 323
 324         /* wait for scan work complete */
 325         flush_workqueue(local->workqueue);
 326
 327         mutex_lock(&local->mtx);
 328         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 329              rcu_dereference_protected(local->sched_scan_sdata,
 330                                        lockdep_is_held(&local->mtx)),
 331                 "%s called with hardware scan in progress\n", __func__);
 332         mutex_unlock(&local->mtx);
 333
 334         rtnl_lock();
 335         ieee80211_scan_cancel(local);
 336         ieee80211_reconfig(local);
 337         rtnl_unlock();
 338 }
 339
 340 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 341 {
 342         struct ieee80211_local *local = hw_to_local(hw);
 343
 344         trace_api_restart_hw(local);
 345
 346         wiphy_info(hw->wiphy,
 347                    "Hardware restart was requested\n");
 348
 349         /* use this reason, ieee80211_reconfig will unblock it */
 350         ieee80211_stop_queues_by_reason(hw,
 351                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 352
 353         /*
 354          * Stop all Rx during the reconfig. We don't want state changes
 355          * or driver callbacks while this is in progress.
 356          */
 357         local->in_reconfig = true;
 358         barrier();
 359
 360         schedule_work(&local->restart_work);
 361 }
 362 EXPORT_SYMBOL(ieee80211_restart_hw);
 363
 364 static void ieee80211_recalc_smps_work(struct work_struct *work)
 365 {
 366         struct ieee80211_local *local =
 367                 container_of(work, struct ieee80211_local, recalc_smps);
 368
 369         mutex_lock(&local->iflist_mtx);
 370         ieee80211_recalc_smps(local);
 371         mutex_unlock(&local->iflist_mtx);
 372 }
 373
 374 #ifdef CONFIG_INET
 375 static int ieee80211_ifa_changed(struct notifier_block *nb,
 376                                  unsigned long data, void *arg)
 377 {
 378         struct in_ifaddr *ifa = arg;
 379         struct ieee80211_local *local =
 380                 container_of(nb, struct ieee80211_local,
 381                              ifa_notifier);
 382         struct net_device *ndev = ifa->ifa_dev->dev;
 383         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 384         struct in_device *idev;
 385         struct ieee80211_sub_if_data *sdata;
 386         struct ieee80211_bss_conf *bss_conf;
 387         struct ieee80211_if_managed *ifmgd;
 388         int c = 0;
 389
 390         /* Make sure it's our interface that got changed */
 391         if (!wdev)
 392                 return NOTIFY_DONE;
 393
 394         if (wdev->wiphy != local->hw.wiphy)
 395                 return NOTIFY_DONE;
 396
 397         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 398         bss_conf = &sdata->vif.bss_conf;
 399
 400         /* ARP filtering is only supported in managed mode */
 401         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 402                 return NOTIFY_DONE;
 403
 404         idev = __in_dev_get_rtnl(sdata->dev);
 405         if (!idev)
 406                 return NOTIFY_DONE;
 407
 408         ifmgd = &sdata->u.mgd;
 409         mutex_lock(&ifmgd->mtx);
 410
 411         /* Copy the addresses to the bss_conf list */
 412         ifa = idev->ifa_list;
 413         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 414                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 415                 ifa = ifa->ifa_next;
 416                 c++;
 417         }
 418
 419         /* If not all addresses fit the list, disable filtering */
 420         if (ifa) {
 421                 sdata->arp_filter_state = false;
 422                 c = 0;
 423         } else {
 424                 sdata->arp_filter_state = true;
 425         }
 426         bss_conf->arp_addr_cnt = c;
 427
 428         /* Configure driver only if associated (which also implies it is up) */
 429         if (ifmgd->associated) {
 430                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 431                 ieee80211_bss_info_change_notify(sdata,
 432                                                  BSS_CHANGED_ARP_FILTER);
 433         }
 434
 435         mutex_unlock(&ifmgd->mtx);
 436
 437         return NOTIFY_DONE;
 438 }
 439 #endif
 440
 441 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 442 {
 443         struct ieee80211_local *local =
 444                 container_of(napi, struct ieee80211_local, napi);
 445
 446         return local->ops->napi_poll(&local->hw, budget);
 447 }
 448
 449 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 450 {
 451         struct ieee80211_local *local = hw_to_local(hw);
 452
 453         napi_schedule(&local->napi);
 454 }
 455 EXPORT_SYMBOL(ieee80211_napi_schedule);
 456
 457 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 458 {
 459         struct ieee80211_local *local = hw_to_local(hw);
 460
 461         napi_complete(&local->napi);
 462 }
 463 EXPORT_SYMBOL(ieee80211_napi_complete);
 464
 465 /* There isn't a lot of sense in it, but you can transmit anything you like */
 466 static const struct ieee80211_txrx_stypes
 467 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 468         [NL80211_IFTYPE_ADHOC] = {
 469                 .tx = 0xffff,
 470                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 471                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 472                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 473         },
 474         [NL80211_IFTYPE_STATION] = {
 475                 .tx = 0xffff,
 476                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 477                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 478         },
 479         [NL80211_IFTYPE_AP] = {
 480                 .tx = 0xffff,
 481                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 482                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 483                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 484                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 485                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 486                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 487                         BIT(IEEE80211_STYPE_ACTION >> 4),
 488         },
 489         [NL80211_IFTYPE_AP_VLAN] = {
 490                 /* copy AP */
 491                 .tx = 0xffff,
 492                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 493                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 494                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 495                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 496                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 497                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 498                         BIT(IEEE80211_STYPE_ACTION >> 4),
 499         },
 500         [NL80211_IFTYPE_P2P_CLIENT] = {
 501                 .tx = 0xffff,
 502                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 503                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 504         },
 505         [NL80211_IFTYPE_P2P_GO] = {
 506                 .tx = 0xffff,
 507                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 508                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 509                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 510                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 511                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 512                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 513                         BIT(IEEE80211_STYPE_ACTION >> 4),
 514         },
 515         [NL80211_IFTYPE_MESH_POINT] = {
 516                 .tx = 0xffff,
 517                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 518                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 519                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 520         },
 521         [NL80211_IFTYPE_P2P_DEVICE] = {
 522                 .tx = 0xffff,
 523                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 524                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 525         },
 526 };
 527
 528 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 529         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 530                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 531
 532         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 533                                 IEEE80211_HT_CAP_MAX_AMSDU |
 534                                 IEEE80211_HT_CAP_SGI_40),
 535         .mcs = {
 536                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 537                              0xff, 0xff, 0xff, 0xff, 0xff, },
 538         },
 539 };
 540
 541 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 542                                         const struct ieee80211_ops *ops)
 543 {
 544         struct ieee80211_local *local;
 545         int priv_size, i;
 546         struct wiphy *wiphy;
 547
 548         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 549                 return NULL;
 550
 551         /* Ensure 32-byte alignment of our private data and hw private data.
 552          * We use the wiphy priv data for both our ieee80211_local and for
 553          * the driver's private data
 554          *
 555          * In memory it'll be like this:
 556          *
 557          * +-------------------------+
 558          * | struct wiphy           |
 559          * +-------------------------+
 560          * | struct ieee80211_local  |
 561          * +-------------------------+
 562          * | driver's private data   |
 563          * +-------------------------+
 564          *
 565          */
 566         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 567
 568         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 569
 570         if (!wiphy)
 571                 return NULL;
 572
 573         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 574
 575         wiphy->privid = mac80211_wiphy_privid;
 576
 577         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 578                         WIPHY_FLAG_4ADDR_AP |
 579                         WIPHY_FLAG_4ADDR_STATION |
 580                         WIPHY_FLAG_REPORTS_OBSS |
 581                         WIPHY_FLAG_OFFCHAN_TX;
 582
 583         if (ops->remain_on_channel)
 584                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 585
 586         wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 587                           NL80211_FEATURE_HT_IBSS;
 588
 589         if (!ops->set_key)
 590                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 591
 592         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 593
 594         local = wiphy_priv(wiphy);
 595
 596         local->hw.wiphy = wiphy;
 597
 598         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 599
 600         BUG_ON(!ops->tx);
 601         BUG_ON(!ops->start);
 602         BUG_ON(!ops->stop);
 603         BUG_ON(!ops->config);
 604         BUG_ON(!ops->add_interface);
 605         BUG_ON(!ops->remove_interface);
 606         BUG_ON(!ops->configure_filter);
 607         local->ops = ops;
 608
 609         /* set up some defaults */
 610         local->hw.queues = 1;
 611         local->hw.max_rates = 1;
 612         local->hw.max_report_rates = 0;
 613         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 614         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 615         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 616         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 617         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 618         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 619                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 620                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 621         local->user_power_level = -1;
 622         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 623
 624         INIT_LIST_HEAD(&local->interfaces);
 625
 626         __hw_addr_init(&local->mc_list);
 627
 628         mutex_init(&local->iflist_mtx);
 629         mutex_init(&local->mtx);
 630
 631         mutex_init(&local->key_mtx);
 632         spin_lock_init(&local->filter_lock);
 633         spin_lock_init(&local->queue_stop_reason_lock);
 634
 635         /*
 636          * The rx_skb_queue is only accessed from tasklets,
 637          * but other SKB queues are used from within IRQ
 638          * context. Therefore, this one needs a different
 639          * locking class so our direct, non-irq-safe use of
 640          * the queue's lock doesn't throw lockdep warnings.
 641          */
 642         skb_queue_head_init_class(&local->rx_skb_queue,
 643                                   &ieee80211_rx_skb_queue_class);
 644
 645         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 646
 647         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 648
 649         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 650         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 651         local->smps_mode = IEEE80211_SMPS_OFF;
 652
 653         INIT_WORK(&local->dynamic_ps_enable_work,
 654                   ieee80211_dynamic_ps_enable_work);
 655         INIT_WORK(&local->dynamic_ps_disable_work,
 656                   ieee80211_dynamic_ps_disable_work);
 657         setup_timer(&local->dynamic_ps_timer,
 658                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 659
 660         INIT_WORK(&local->sched_scan_stopped_work,
 661                   ieee80211_sched_scan_stopped_work);
 662
 663         spin_lock_init(&local->ack_status_lock);
 664         idr_init(&local->ack_status_frames);
 665         /* preallocate at least one entry */
 666         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 667
 668         sta_info_init(local);
 669
 670         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 671                 skb_queue_head_init(&local->pending[i]);
 672                 atomic_set(&local->agg_queue_stop[i], 0);
 673         }
 674         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 675                      (unsigned long)local);
 676
 677         tasklet_init(&local->tasklet,
 678                      ieee80211_tasklet_handler,
 679                      (unsigned long) local);
 680
 681         skb_queue_head_init(&local->skb_queue);
 682         skb_queue_head_init(&local->skb_queue_unreliable);
 683
 684         /* init dummy netdev for use w/ NAPI */
 685         init_dummy_netdev(&local->napi_dev);
 686
 687         ieee80211_led_names(local);
 688
 689         ieee80211_roc_setup(local);
 690
 691         return &local->hw;
 692 }
 693 EXPORT_SYMBOL(ieee80211_alloc_hw);
 694
 695 int ieee80211_register_hw(struct ieee80211_hw *hw)
 696 {
 697         struct ieee80211_local *local = hw_to_local(hw);
 698         int result, i;
 699         enum ieee80211_band band;
 700         int channels, max_bitrates;
 701         bool supp_ht, supp_vht;
 702         netdev_features_t feature_whitelist;
 703         static const u32 cipher_suites[] = {
 704                 /* keep WEP first, it may be removed below */
 705                 WLAN_CIPHER_SUITE_WEP40,
 706                 WLAN_CIPHER_SUITE_WEP104,
 707                 WLAN_CIPHER_SUITE_TKIP,
 708                 WLAN_CIPHER_SUITE_CCMP,
 709
 710                 /* keep last -- depends on hw flags! */
 711                 WLAN_CIPHER_SUITE_AES_CMAC
 712         };
 713
 714         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 715             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 716              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 717                 return -EINVAL;
 718
 719 #ifdef CONFIG_PM
 720         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 721             (!local->ops->suspend || !local->ops->resume))
 722                 return -EINVAL;
 723 #endif
 724
 725         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 726                 return -EINVAL;
 727
 728         /* Only HW csum features are currently compatible with mac80211 */
 729         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 730                             NETIF_F_HW_CSUM;
 731         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 732                 return -EINVAL;
 733
 734         if (hw->max_report_rates == 0)
 735                 hw->max_report_rates = hw->max_rates;
 736
 737         /*
 738          * generic code guarantees at least one band,
 739          * set this very early because much code assumes
 740          * that hw.conf.channel is assigned
 741          */
 742         channels = 0;
 743         max_bitrates = 0;
 744         supp_ht = false;
 745         supp_vht = false;
 746         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 747                 struct ieee80211_supported_band *sband;
 748
 749                 sband = local->hw.wiphy->bands[band];
 750                 if (!sband)
 751                         continue;
 752                 if (!local->oper_channel) {
 753                         /* init channel we're on */
 754                         local->hw.conf.channel =
 755                         local->oper_channel = &sband->channels[0];
 756                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 757                 }
 758                 channels += sband->n_channels;
 759
 760                 if (max_bitrates < sband->n_bitrates)
 761                         max_bitrates = sband->n_bitrates;
 762                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 763                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 764         }
 765
 766         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 767                                       sizeof(void *) * channels, GFP_KERNEL);
 768         if (!local->int_scan_req)
 769                 return -ENOMEM;
 770
 771         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 772                 if (!local->hw.wiphy->bands[band])
 773                         continue;
 774                 local->int_scan_req->rates[band] = (u32) -1;
 775         }
 776
 777         /* if low-level driver supports AP, we also support VLAN */
 778         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 779                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 780                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 781         }
 782
 783         /* mac80211 always supports monitor */
 784         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 785         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 786
 787         /*
 788          * mac80211 doesn't support more than 1 channel, and also not more
 789          * than one IBSS interface
 790          */
 791         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 792                 const struct ieee80211_iface_combination *c;
 793                 int j;
 794
 795                 c = &hw->wiphy->iface_combinations[i];
 796
 797                 if (c->num_different_channels > 1)
 798                         return -EINVAL;
 799
 800                 for (j = 0; j < c->n_limits; j++)
 801                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 802                             c->limits[j].max > 1)
 803                                 return -EINVAL;
 804         }
 805
 806 #ifndef CONFIG_MAC80211_MESH
 807         /* mesh depends on Kconfig, but drivers should set it if they want */
 808         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 809 #endif
 810
 811         /* if the underlying driver supports mesh, mac80211 will (at least)
 812          * provide routing of mesh authentication frames to userspace */
 813         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 814                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 815
 816         /* mac80211 supports control port protocol changing */
 817         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 818
 819         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 820                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 821         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 822                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 823
 824         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 825              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 826              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 827
 828         /*
 829          * Calculate scan IE length -- we need this to alloc
 830          * memory and to subtract from the driver limit. It
 831          * includes the DS Params, (extended) supported rates, and HT
 832          * information -- SSID is the driver's responsibility.
 833          */
 834         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 835                 3 /* DS Params */;
 836         if (supp_ht)
 837                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 838
 839         if (supp_vht)
 840                 local->scan_ies_len +=
 841                         2 + sizeof(struct ieee80211_vht_capabilities);
 842
 843         if (!local->ops->hw_scan) {
 844                 /* For hw_scan, driver needs to set these up. */
 845                 local->hw.wiphy->max_scan_ssids = 4;
 846                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 847         }
 848
 849         /*
 850          * If the driver supports any scan IEs, then assume the
 851          * limit includes the IEs mac80211 will add, otherwise
 852          * leave it at zero and let the driver sort it out; we
 853          * still pass our IEs to the driver but userspace will
 854          * not be allowed to in that case.
 855          */
 856         if (local->hw.wiphy->max_scan_ie_len)
 857                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 858
 859         /* Set up cipher suites unless driver already did */
 860         if (!local->hw.wiphy->cipher_suites) {
 861                 local->hw.wiphy->cipher_suites = cipher_suites;
 862                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 863                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 864                         local->hw.wiphy->n_cipher_suites--;
 865         }
 866         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 867                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 868                         local->hw.wiphy->cipher_suites += 2;
 869                         local->hw.wiphy->n_cipher_suites -= 2;
 870                 } else {
 871                         u32 *suites;
 872                         int r, w = 0;
 873
 874                         /* Filter out WEP */
 875
 876                         suites = kmemdup(
 877                                 local->hw.wiphy->cipher_suites,
 878                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 879                                 GFP_KERNEL);
 880                         if (!suites)
 881                                 return -ENOMEM;
 882                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 883                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 884                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 885                                     suite == WLAN_CIPHER_SUITE_WEP104)
 886                                         continue;
 887                                 suites[w++] = suite;
 888                         }
 889                         local->hw.wiphy->cipher_suites = suites;
 890                         local->hw.wiphy->n_cipher_suites = w;
 891                         local->wiphy_ciphers_allocated = true;
 892                 }
 893         }
 894
 895         if (!local->ops->remain_on_channel)
 896                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 897
 898         if (local->ops->sched_scan_start)
 899                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 900
 901         /* mac80211 based drivers don't support internal TDLS setup */
 902         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 903                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 904
 905         result = wiphy_register(local->hw.wiphy);
 906         if (result < 0)
 907                 goto fail_wiphy_register;
 908
 909         /*
 910          * We use the number of queues for feature tests (QoS, HT) internally
 911          * so restrict them appropriately.
 912          */
 913         if (hw->queues > IEEE80211_MAX_QUEUES)
 914                 hw->queues = IEEE80211_MAX_QUEUES;
 915
 916         local->workqueue =
 917                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 918         if (!local->workqueue) {
 919                 result = -ENOMEM;
 920                 goto fail_workqueue;
 921         }
 922
 923         /*
 924          * The hardware needs headroom for sending the frame,
 925          * and we need some headroom for passing the frame to monitor
 926          * interfaces, but never both at the same time.
 927          */
 928         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 929                                    IEEE80211_TX_STATUS_HEADROOM);
 930
 931         debugfs_hw_add(local);
 932
 933         /*
 934          * if the driver doesn't specify a max listen interval we
 935          * use 5 which should be a safe default
 936          */
 937         if (local->hw.max_listen_interval == 0)
 938                 local->hw.max_listen_interval = 5;
 939
 940         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 941
 942         local->dynamic_ps_forced_timeout = -1;
 943
 944         result = ieee80211_wep_init(local);
 945         if (result < 0)
 946                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 947                             result);
 948
 949         ieee80211_led_init(local);
 950
 951         rtnl_lock();
 952
 953         result = ieee80211_init_rate_ctrl_alg(local,
 954                                               hw->rate_control_algorithm);
 955         if (result < 0) {
 956                 wiphy_debug(local->hw.wiphy,
 957                             "Failed to initialize rate control algorithm\n");
 958                 goto fail_rate;
 959         }
 960
 961         /* add one default STA interface if supported */
 962         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 963                 result = ieee80211_if_add(local, "wlan%d", NULL,
 964                                           NL80211_IFTYPE_STATION, NULL);
 965                 if (result)
 966                         wiphy_warn(local->hw.wiphy,
 967                                    "Failed to add default virtual iface\n");
 968         }
 969
 970         rtnl_unlock();
 971
 972         local->network_latency_notifier.notifier_call =
 973                 ieee80211_max_network_latency;
 974         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 975                                      &local->network_latency_notifier);
 976         if (result) {
 977                 rtnl_lock();
 978                 goto fail_pm_qos;
 979         }
 980
 981 #ifdef CONFIG_INET
 982         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 983         result = register_inetaddr_notifier(&local->ifa_notifier);
 984         if (result)
 985                 goto fail_ifa;
 986 #endif
 987
 988         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 989                         local->hw.napi_weight);
 990
 991         return 0;
 992
 993 #ifdef CONFIG_INET
 994  fail_ifa:
 995         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 996                                &local->network_latency_notifier);
 997         rtnl_lock();
 998 #endif
 999  fail_pm_qos:
1000         ieee80211_led_exit(local);
1001         ieee80211_remove_interfaces(local);
1002  fail_rate:
1003         rtnl_unlock();
1004         ieee80211_wep_free(local);
1005         sta_info_stop(local);
1006         destroy_workqueue(local->workqueue);
1007  fail_workqueue:
1008         wiphy_unregister(local->hw.wiphy);
1009  fail_wiphy_register:
1010         if (local->wiphy_ciphers_allocated)
1011                 kfree(local->hw.wiphy->cipher_suites);
1012         kfree(local->int_scan_req);
1013         return result;
1014 }
1015 EXPORT_SYMBOL(ieee80211_register_hw);
1016
1017 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1018 {
1019         struct ieee80211_local *local = hw_to_local(hw);
1020
1021         tasklet_kill(&local->tx_pending_tasklet);
1022         tasklet_kill(&local->tasklet);
1023
1024         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1025                                &local->network_latency_notifier);
1026 #ifdef CONFIG_INET
1027         unregister_inetaddr_notifier(&local->ifa_notifier);
1028 #endif
1029
1030         rtnl_lock();
1031
1032         /*
1033          * At this point, interface list manipulations are fine
1034          * because the driver cannot be handing us frames any
1035          * more and the tasklet is killed.
1036          */
1037         ieee80211_remove_interfaces(local);
1038
1039         rtnl_unlock();
1040
1041         cancel_work_sync(&local->restart_work);
1042         cancel_work_sync(&local->reconfig_filter);
1043
1044         ieee80211_clear_tx_pending(local);
1045         rate_control_deinitialize(local);
1046
1047         if (skb_queue_len(&local->skb_queue) ||
1048             skb_queue_len(&local->skb_queue_unreliable))
1049                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1050         skb_queue_purge(&local->skb_queue);
1051         skb_queue_purge(&local->skb_queue_unreliable);
1052         skb_queue_purge(&local->rx_skb_queue);
1053
1054         destroy_workqueue(local->workqueue);
1055         wiphy_unregister(local->hw.wiphy);
1056         sta_info_stop(local);
1057         ieee80211_wep_free(local);
1058         ieee80211_led_exit(local);
1059         kfree(local->int_scan_req);
1060 }
1061 EXPORT_SYMBOL(ieee80211_unregister_hw);
1062
1063 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1064 {
1065         WARN_ONCE(1, "Have pending ack frames!\n");
1066         kfree_skb(p);
1067         return 0;
1068 }
1069
1070 void ieee80211_free_hw(struct ieee80211_hw *hw)
1071 {
1072         struct ieee80211_local *local = hw_to_local(hw);
1073
1074         mutex_destroy(&local->iflist_mtx);
1075         mutex_destroy(&local->mtx);
1076
1077         if (local->wiphy_ciphers_allocated)
1078                 kfree(local->hw.wiphy->cipher_suites);
1079
1080         idr_for_each(&local->ack_status_frames,
1081                      ieee80211_free_ack_frame, NULL);
1082         idr_destroy(&local->ack_status_frames);
1083
1084         wiphy_free(local->hw.wiphy);
1085 }
1086 EXPORT_SYMBOL(ieee80211_free_hw);
1087
1088 static int __init ieee80211_init(void)
1089 {
1090         struct sk_buff *skb;
1091         int ret;
1092
1093         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1094         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1095                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1096
1097         ret = rc80211_minstrel_init();
1098         if (ret)
1099                 return ret;
1100
1101         ret = rc80211_minstrel_ht_init();
1102         if (ret)
1103                 goto err_minstrel;
1104
1105         ret = rc80211_pid_init();
1106         if (ret)
1107                 goto err_pid;
1108
1109         ret = ieee80211_iface_init();
1110         if (ret)
1111                 goto err_netdev;
1112
1113         return 0;
1114  err_netdev:
1115         rc80211_pid_exit();
1116  err_pid:
1117         rc80211_minstrel_ht_exit();
1118  err_minstrel:
1119         rc80211_minstrel_exit();
1120
1121         return ret;
1122 }
1123
1124 static void __exit ieee80211_exit(void)
1125 {
1126         rc80211_pid_exit();
1127         rc80211_minstrel_ht_exit();
1128         rc80211_minstrel_exit();
1129
1130         if (mesh_allocated)
1131                 ieee80211s_stop();
1132
1133         ieee80211_iface_exit();
1134
1135         rcu_barrier();
1136 }
1137
1138
1139 subsys_initcall(ieee80211_init);
1140 module_exit(ieee80211_exit);
1141
1142 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1143 MODULE_LICENSE("GPL");