linux/net/mac80211/main.c
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   1/*
   2 * Copyright 2002-2005, Instant802 Networks, Inc.
   3 * Copyright 2005-2006, Devicescape Software, Inc.
   4 * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <net/mac80211.h>
  12#include <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
  36static struct lock_class_key ieee80211_rx_skb_queue_class;
  37
  38void 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
  88static 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
  96int 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            !local->ap_power_level)
 155                power = chan->max_power;
 156        else
 157                power = min(chan->max_power, local->ap_power_level);
 158
 159        if (local->user_power_level >= 0)
 160                power = min(power, local->user_power_level);
 161
 162        if (local->hw.conf.power_level != power) {
 163                changed |= IEEE80211_CONF_CHANGE_POWER;
 164                local->hw.conf.power_level = power;
 165        }
 166
 167        if (changed && local->open_count) {
 168                ret = drv_config(local, changed);
 169                /*
 170                 * Goal:
 171                 * HW reconfiguration should never fail, the driver has told
 172                 * us what it can support so it should live up to that promise.
 173                 *
 174                 * Current status:
 175                 * rfkill is not integrated with mac80211 and a
 176                 * configuration command can thus fail if hardware rfkill
 177                 * is enabled
 178                 *
 179                 * FIXME: integrate rfkill with mac80211 and then add this
 180                 * WARN_ON() back
 181                 *
 182                 */
 183                /* WARN_ON(ret); */
 184        }
 185
 186        return ret;
 187}
 188
 189void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 190                                      u32 changed)
 191{
 192        struct ieee80211_local *local = sdata->local;
 193        static const u8 zero[ETH_ALEN] = { 0 };
 194
 195        if (!changed)
 196                return;
 197
 198        if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 199                sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 200        } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 201                sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 202        else if (sdata->vif.type == NL80211_IFTYPE_AP)
 203                sdata->vif.bss_conf.bssid = sdata->vif.addr;
 204        else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 205                sdata->vif.bss_conf.bssid = NULL;
 206        else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 207                sdata->vif.bss_conf.bssid = zero;
 208        } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 209                sdata->vif.bss_conf.bssid = sdata->vif.addr;
 210                WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
 211                          "P2P Device BSS changed %#x", changed);
 212        } else {
 213                WARN_ON(1);
 214                return;
 215        }
 216
 217        switch (sdata->vif.type) {
 218        case NL80211_IFTYPE_AP:
 219        case NL80211_IFTYPE_ADHOC:
 220        case NL80211_IFTYPE_WDS:
 221        case NL80211_IFTYPE_MESH_POINT:
 222                break;
 223        default:
 224                /* do not warn to simplify caller in scan.c */
 225                changed &= ~BSS_CHANGED_BEACON_ENABLED;
 226                if (WARN_ON(changed & BSS_CHANGED_BEACON))
 227                        return;
 228                break;
 229        }
 230
 231        if (changed & BSS_CHANGED_BEACON_ENABLED) {
 232                if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 233                    test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 234                        sdata->vif.bss_conf.enable_beacon = false;
 235                } else {
 236                        /*
 237                         * Beacon should be enabled, but AP mode must
 238                         * check whether there is a beacon configured.
 239                         */
 240                        switch (sdata->vif.type) {
 241                        case NL80211_IFTYPE_AP:
 242                                sdata->vif.bss_conf.enable_beacon =
 243                                        !!sdata->u.ap.beacon;
 244                                break;
 245                        case NL80211_IFTYPE_ADHOC:
 246                                sdata->vif.bss_conf.enable_beacon =
 247                                        !!sdata->u.ibss.presp;
 248                                break;
 249#ifdef CONFIG_MAC80211_MESH
 250                        case NL80211_IFTYPE_MESH_POINT:
 251                                sdata->vif.bss_conf.enable_beacon =
 252                                        !!sdata->u.mesh.mesh_id_len;
 253                                break;
 254#endif
 255                        default:
 256                                /* not reached */
 257                                WARN_ON(1);
 258                                break;
 259                        }
 260                }
 261        }
 262
 263        drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 264}
 265
 266u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 267{
 268        sdata->vif.bss_conf.use_cts_prot = false;
 269        sdata->vif.bss_conf.use_short_preamble = false;
 270        sdata->vif.bss_conf.use_short_slot = false;
 271        return BSS_CHANGED_ERP_CTS_PROT |
 272               BSS_CHANGED_ERP_PREAMBLE |
 273               BSS_CHANGED_ERP_SLOT;
 274}
 275
 276static void ieee80211_tasklet_handler(unsigned long data)
 277{
 278        struct ieee80211_local *local = (struct ieee80211_local *) data;
 279        struct sta_info *sta, *tmp;
 280        struct skb_eosp_msg_data *eosp_data;
 281        struct sk_buff *skb;
 282
 283        while ((skb = skb_dequeue(&local->skb_queue)) ||
 284               (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 285                switch (skb->pkt_type) {
 286                case IEEE80211_RX_MSG:
 287                        /* Clear skb->pkt_type in order to not confuse kernel
 288                         * netstack. */
 289                        skb->pkt_type = 0;
 290                        ieee80211_rx(&local->hw, skb);
 291                        break;
 292                case IEEE80211_TX_STATUS_MSG:
 293                        skb->pkt_type = 0;
 294                        ieee80211_tx_status(&local->hw, skb);
 295                        break;
 296                case IEEE80211_EOSP_MSG:
 297                        eosp_data = (void *)skb->cb;
 298                        for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 299                                /* skip wrong virtual interface */
 300                                if (memcmp(eosp_data->iface,
 301                                           sta->sdata->vif.addr, ETH_ALEN))
 302                                        continue;
 303                                clear_sta_flag(sta, WLAN_STA_SP);
 304                                break;
 305                        }
 306                        dev_kfree_skb(skb);
 307                        break;
 308                default:
 309                        WARN(1, "mac80211: Packet is of unknown type %d\n",
 310                             skb->pkt_type);
 311                        dev_kfree_skb(skb);
 312                        break;
 313                }
 314        }
 315}
 316
 317static void ieee80211_restart_work(struct work_struct *work)
 318{
 319        struct ieee80211_local *local =
 320                container_of(work, struct ieee80211_local, restart_work);
 321
 322        /* wait for scan work complete */
 323        flush_workqueue(local->workqueue);
 324
 325        mutex_lock(&local->mtx);
 326        WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 327             rcu_dereference_protected(local->sched_scan_sdata,
 328                                       lockdep_is_held(&local->mtx)),
 329                "%s called with hardware scan in progress\n", __func__);
 330        mutex_unlock(&local->mtx);
 331
 332        rtnl_lock();
 333        ieee80211_scan_cancel(local);
 334        ieee80211_reconfig(local);
 335        rtnl_unlock();
 336}
 337
 338void ieee80211_restart_hw(struct ieee80211_hw *hw)
 339{
 340        struct ieee80211_local *local = hw_to_local(hw);
 341
 342        trace_api_restart_hw(local);
 343
 344        wiphy_info(hw->wiphy,
 345                   "Hardware restart was requested\n");
 346
 347        /* use this reason, ieee80211_reconfig will unblock it */
 348        ieee80211_stop_queues_by_reason(hw,
 349                IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 350
 351        /*
 352         * Stop all Rx during the reconfig. We don't want state changes
 353         * or driver callbacks while this is in progress.
 354         */
 355        local->in_reconfig = true;
 356        barrier();
 357
 358        schedule_work(&local->restart_work);
 359}
 360EXPORT_SYMBOL(ieee80211_restart_hw);
 361
 362static void ieee80211_recalc_smps_work(struct work_struct *work)
 363{
 364        struct ieee80211_local *local =
 365                container_of(work, struct ieee80211_local, recalc_smps);
 366
 367        ieee80211_recalc_smps(local);
 368}
 369
 370#ifdef CONFIG_INET
 371static 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
 437static 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
 445void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 446{
 447        struct ieee80211_local *local = hw_to_local(hw);
 448
 449        napi_schedule(&local->napi);
 450}
 451EXPORT_SYMBOL(ieee80211_napi_schedule);
 452
 453void ieee80211_napi_complete(struct ieee80211_hw *hw)
 454{
 455        struct ieee80211_local *local = hw_to_local(hw);
 456
 457        napi_complete(&local->napi);
 458}
 459EXPORT_SYMBOL(ieee80211_napi_complete);
 460
 461/* There isn't a lot of sense in it, but you can transmit anything you like */
 462static const struct ieee80211_txrx_stypes
 463ieee80211_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        [NL80211_IFTYPE_P2P_DEVICE] = {
 518                .tx = 0xffff,
 519                .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 520                        BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 521        },
 522};
 523
 524static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 525        .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 526                             IEEE80211_HT_AMPDU_PARM_DENSITY,
 527
 528        .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 529                                IEEE80211_HT_CAP_MAX_AMSDU |
 530                                IEEE80211_HT_CAP_SGI_40),
 531        .mcs = {
 532                .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 533                             0xff, 0xff, 0xff, 0xff, 0xff, },
 534        },
 535};
 536
 537struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 538                                        const struct ieee80211_ops *ops)
 539{
 540        struct ieee80211_local *local;
 541        int priv_size, i;
 542        struct wiphy *wiphy;
 543
 544        if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 545                    !ops->add_interface || !ops->remove_interface ||
 546                    !ops->configure_filter))
 547                return NULL;
 548
 549        if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 550                return NULL;
 551
 552        /* Ensure 32-byte alignment of our private data and hw private data.
 553         * We use the wiphy priv data for both our ieee80211_local and for
 554         * the driver's private data
 555         *
 556         * In memory it'll be like this:
 557         *
 558         * +-------------------------+
 559         * | struct wiphy           |
 560         * +-------------------------+
 561         * | struct ieee80211_local  |
 562         * +-------------------------+
 563         * | driver's private data   |
 564         * +-------------------------+
 565         *
 566         */
 567        priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 568
 569        wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 570
 571        if (!wiphy)
 572                return NULL;
 573
 574        wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 575
 576        wiphy->privid = mac80211_wiphy_privid;
 577
 578        wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 579                        WIPHY_FLAG_4ADDR_AP |
 580                        WIPHY_FLAG_4ADDR_STATION |
 581                        WIPHY_FLAG_REPORTS_OBSS |
 582                        WIPHY_FLAG_OFFCHAN_TX;
 583
 584        if (ops->remain_on_channel)
 585                wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 586
 587        wiphy->features = NL80211_FEATURE_SK_TX_STATUS |
 588                          NL80211_FEATURE_HT_IBSS;
 589
 590        if (!ops->set_key)
 591                wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 592
 593        wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 594
 595        local = wiphy_priv(wiphy);
 596
 597        local->hw.wiphy = wiphy;
 598
 599        local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 600
 601        local->ops = ops;
 602
 603        /* set up some defaults */
 604        local->hw.queues = 1;
 605        local->hw.max_rates = 1;
 606        local->hw.max_report_rates = 0;
 607        local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 608        local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 609        local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 610        local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 611        local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 612        local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 613                                         IEEE80211_RADIOTAP_MCS_HAVE_GI |
 614                                         IEEE80211_RADIOTAP_MCS_HAVE_BW;
 615        local->user_power_level = -1;
 616        wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 617
 618        INIT_LIST_HEAD(&local->interfaces);
 619
 620        __hw_addr_init(&local->mc_list);
 621
 622        mutex_init(&local->iflist_mtx);
 623        mutex_init(&local->mtx);
 624
 625        mutex_init(&local->key_mtx);
 626        spin_lock_init(&local->filter_lock);
 627        spin_lock_init(&local->queue_stop_reason_lock);
 628
 629        /*
 630         * The rx_skb_queue is only accessed from tasklets,
 631         * but other SKB queues are used from within IRQ
 632         * context. Therefore, this one needs a different
 633         * locking class so our direct, non-irq-safe use of
 634         * the queue's lock doesn't throw lockdep warnings.
 635         */
 636        skb_queue_head_init_class(&local->rx_skb_queue,
 637                                  &ieee80211_rx_skb_queue_class);
 638
 639        INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 640
 641        INIT_WORK(&local->restart_work, ieee80211_restart_work);
 642
 643        INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 644        INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 645        local->smps_mode = IEEE80211_SMPS_OFF;
 646
 647        INIT_WORK(&local->dynamic_ps_enable_work,
 648                  ieee80211_dynamic_ps_enable_work);
 649        INIT_WORK(&local->dynamic_ps_disable_work,
 650                  ieee80211_dynamic_ps_disable_work);
 651        setup_timer(&local->dynamic_ps_timer,
 652                    ieee80211_dynamic_ps_timer, (unsigned long) local);
 653
 654        INIT_WORK(&local->sched_scan_stopped_work,
 655                  ieee80211_sched_scan_stopped_work);
 656
 657        spin_lock_init(&local->ack_status_lock);
 658        idr_init(&local->ack_status_frames);
 659        /* preallocate at least one entry */
 660        idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 661
 662        sta_info_init(local);
 663
 664        for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 665                skb_queue_head_init(&local->pending[i]);
 666                atomic_set(&local->agg_queue_stop[i], 0);
 667        }
 668        tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 669                     (unsigned long)local);
 670
 671        tasklet_init(&local->tasklet,
 672                     ieee80211_tasklet_handler,
 673                     (unsigned long) local);
 674
 675        skb_queue_head_init(&local->skb_queue);
 676        skb_queue_head_init(&local->skb_queue_unreliable);
 677
 678        /* init dummy netdev for use w/ NAPI */
 679        init_dummy_netdev(&local->napi_dev);
 680
 681        ieee80211_led_names(local);
 682
 683        ieee80211_roc_setup(local);
 684
 685        return &local->hw;
 686}
 687EXPORT_SYMBOL(ieee80211_alloc_hw);
 688
 689int ieee80211_register_hw(struct ieee80211_hw *hw)
 690{
 691        struct ieee80211_local *local = hw_to_local(hw);
 692        int result, i;
 693        enum ieee80211_band band;
 694        int channels, max_bitrates;
 695        bool supp_ht, supp_vht;
 696        netdev_features_t feature_whitelist;
 697        static const u32 cipher_suites[] = {
 698                /* keep WEP first, it may be removed below */
 699                WLAN_CIPHER_SUITE_WEP40,
 700                WLAN_CIPHER_SUITE_WEP104,
 701                WLAN_CIPHER_SUITE_TKIP,
 702                WLAN_CIPHER_SUITE_CCMP,
 703
 704                /* keep last -- depends on hw flags! */
 705                WLAN_CIPHER_SUITE_AES_CMAC
 706        };
 707
 708        if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 709            (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 710             local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 711                return -EINVAL;
 712
 713#ifdef CONFIG_PM
 714        if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 715            (!local->ops->suspend || !local->ops->resume))
 716                return -EINVAL;
 717#endif
 718
 719        if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 720                return -EINVAL;
 721
 722        /* Only HW csum features are currently compatible with mac80211 */
 723        feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 724                            NETIF_F_HW_CSUM;
 725        if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 726                return -EINVAL;
 727
 728        if (hw->max_report_rates == 0)
 729                hw->max_report_rates = hw->max_rates;
 730
 731        /*
 732         * generic code guarantees at least one band,
 733         * set this very early because much code assumes
 734         * that hw.conf.channel is assigned
 735         */
 736        channels = 0;
 737        max_bitrates = 0;
 738        supp_ht = false;
 739        supp_vht = false;
 740        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 741                struct ieee80211_supported_band *sband;
 742
 743                sband = local->hw.wiphy->bands[band];
 744                if (!sband)
 745                        continue;
 746                if (!local->oper_channel) {
 747                        /* init channel we're on */
 748                        local->hw.conf.channel =
 749                        local->oper_channel = &sband->channels[0];
 750                        local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 751                }
 752                channels += sband->n_channels;
 753
 754                if (max_bitrates < sband->n_bitrates)
 755                        max_bitrates = sband->n_bitrates;
 756                supp_ht = supp_ht || sband->ht_cap.ht_supported;
 757                supp_vht = supp_vht || sband->vht_cap.vht_supported;
 758        }
 759
 760        local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 761                                      sizeof(void *) * channels, GFP_KERNEL);
 762        if (!local->int_scan_req)
 763                return -ENOMEM;
 764
 765        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 766                if (!local->hw.wiphy->bands[band])
 767                        continue;
 768                local->int_scan_req->rates[band] = (u32) -1;
 769        }
 770
 771        /* if low-level driver supports AP, we also support VLAN */
 772        if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 773                hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 774                hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 775        }
 776
 777        /* mac80211 always supports monitor */
 778        hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 779        hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 780
 781        /*
 782         * mac80211 doesn't support more than 1 channel, and also not more
 783         * than one IBSS interface
 784         */
 785        for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 786                const struct ieee80211_iface_combination *c;
 787                int j;
 788
 789                c = &hw->wiphy->iface_combinations[i];
 790
 791                if (c->num_different_channels > 1)
 792                        return -EINVAL;
 793
 794                for (j = 0; j < c->n_limits; j++)
 795                        if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 796                            c->limits[j].max > 1)
 797                                return -EINVAL;
 798        }
 799
 800#ifndef CONFIG_MAC80211_MESH
 801        /* mesh depends on Kconfig, but drivers should set it if they want */
 802        local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 803#endif
 804
 805        /* if the underlying driver supports mesh, mac80211 will (at least)
 806         * provide routing of mesh authentication frames to userspace */
 807        if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 808                local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 809
 810        /* mac80211 supports control port protocol changing */
 811        local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 812
 813        if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 814                local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 815        else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 816                local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 817
 818        WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 819             && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 820             "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 821
 822        /*
 823         * Calculate scan IE length -- we need this to alloc
 824         * memory and to subtract from the driver limit. It
 825         * includes the DS Params, (extended) supported rates, and HT
 826         * information -- SSID is the driver's responsibility.
 827         */
 828        local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 829                3 /* DS Params */;
 830        if (supp_ht)
 831                local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 832
 833        if (supp_vht)
 834                local->scan_ies_len +=
 835                        2 + sizeof(struct ieee80211_vht_capabilities);
 836
 837        if (!local->ops->hw_scan) {
 838                /* For hw_scan, driver needs to set these up. */
 839                local->hw.wiphy->max_scan_ssids = 4;
 840                local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 841        }
 842
 843        /*
 844         * If the driver supports any scan IEs, then assume the
 845         * limit includes the IEs mac80211 will add, otherwise
 846         * leave it at zero and let the driver sort it out; we
 847         * still pass our IEs to the driver but userspace will
 848         * not be allowed to in that case.
 849         */
 850        if (local->hw.wiphy->max_scan_ie_len)
 851                local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 852
 853        /* Set up cipher suites unless driver already did */
 854        if (!local->hw.wiphy->cipher_suites) {
 855                local->hw.wiphy->cipher_suites = cipher_suites;
 856                local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 857                if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 858                        local->hw.wiphy->n_cipher_suites--;
 859        }
 860        if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 861                if (local->hw.wiphy->cipher_suites == cipher_suites) {
 862                        local->hw.wiphy->cipher_suites += 2;
 863                        local->hw.wiphy->n_cipher_suites -= 2;
 864                } else {
 865                        u32 *suites;
 866                        int r, w = 0;
 867
 868                        /* Filter out WEP */
 869
 870                        suites = kmemdup(
 871                                local->hw.wiphy->cipher_suites,
 872                                sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 873                                GFP_KERNEL);
 874                        if (!suites) {
 875                                result = -ENOMEM;
 876                                goto fail_wiphy_register;
 877                        }
 878                        for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 879                                u32 suite = local->hw.wiphy->cipher_suites[r];
 880                                if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 881                                    suite == WLAN_CIPHER_SUITE_WEP104)
 882                                        continue;
 883                                suites[w++] = suite;
 884                        }
 885                        local->hw.wiphy->cipher_suites = suites;
 886                        local->hw.wiphy->n_cipher_suites = w;
 887                        local->wiphy_ciphers_allocated = true;
 888                }
 889        }
 890
 891        if (!local->ops->remain_on_channel)
 892                local->hw.wiphy->max_remain_on_channel_duration = 5000;
 893
 894        if (local->ops->sched_scan_start)
 895                local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 896
 897        /* mac80211 based drivers don't support internal TDLS setup */
 898        if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 899                local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 900
 901        result = wiphy_register(local->hw.wiphy);
 902        if (result < 0)
 903                goto fail_wiphy_register;
 904
 905        /*
 906         * We use the number of queues for feature tests (QoS, HT) internally
 907         * so restrict them appropriately.
 908         */
 909        if (hw->queues > IEEE80211_MAX_QUEUES)
 910                hw->queues = IEEE80211_MAX_QUEUES;
 911
 912        local->workqueue =
 913                alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 914        if (!local->workqueue) {
 915                result = -ENOMEM;
 916                goto fail_workqueue;
 917        }
 918
 919        /*
 920         * The hardware needs headroom for sending the frame,
 921         * and we need some headroom for passing the frame to monitor
 922         * interfaces, but never both at the same time.
 923         */
 924        local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 925                                   IEEE80211_TX_STATUS_HEADROOM);
 926
 927        debugfs_hw_add(local);
 928
 929        /*
 930         * if the driver doesn't specify a max listen interval we
 931         * use 5 which should be a safe default
 932         */
 933        if (local->hw.max_listen_interval == 0)
 934                local->hw.max_listen_interval = 5;
 935
 936        local->hw.conf.listen_interval = local->hw.max_listen_interval;
 937
 938        local->dynamic_ps_forced_timeout = -1;
 939
 940        result = ieee80211_wep_init(local);
 941        if (result < 0)
 942                wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 943                            result);
 944
 945        ieee80211_led_init(local);
 946
 947        rtnl_lock();
 948
 949        result = ieee80211_init_rate_ctrl_alg(local,
 950                                              hw->rate_control_algorithm);
 951        if (result < 0) {
 952                wiphy_debug(local->hw.wiphy,
 953                            "Failed to initialize rate control algorithm\n");
 954                goto fail_rate;
 955        }
 956
 957        /* add one default STA interface if supported */
 958        if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 959                result = ieee80211_if_add(local, "wlan%d", NULL,
 960                                          NL80211_IFTYPE_STATION, NULL);
 961                if (result)
 962                        wiphy_warn(local->hw.wiphy,
 963                                   "Failed to add default virtual iface\n");
 964        }
 965
 966        rtnl_unlock();
 967
 968        local->network_latency_notifier.notifier_call =
 969                ieee80211_max_network_latency;
 970        result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 971                                     &local->network_latency_notifier);
 972        if (result) {
 973                rtnl_lock();
 974                goto fail_pm_qos;
 975        }
 976
 977#ifdef CONFIG_INET
 978        local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 979        result = register_inetaddr_notifier(&local->ifa_notifier);
 980        if (result)
 981                goto fail_ifa;
 982#endif
 983
 984        netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 985                        local->hw.napi_weight);
 986
 987        return 0;
 988
 989#ifdef CONFIG_INET
 990 fail_ifa:
 991        pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 992                               &local->network_latency_notifier);
 993        rtnl_lock();
 994#endif
 995 fail_pm_qos:
 996        ieee80211_led_exit(local);
 997        ieee80211_remove_interfaces(local);
 998 fail_rate:
 999        rtnl_unlock();
1000        ieee80211_wep_free(local);
1001        sta_info_stop(local);
1002        destroy_workqueue(local->workqueue);
1003 fail_workqueue:
1004        wiphy_unregister(local->hw.wiphy);
1005 fail_wiphy_register:
1006        if (local->wiphy_ciphers_allocated)
1007                kfree(local->hw.wiphy->cipher_suites);
1008        kfree(local->int_scan_req);
1009        return result;
1010}
1011EXPORT_SYMBOL(ieee80211_register_hw);
1012
1013void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1014{
1015        struct ieee80211_local *local = hw_to_local(hw);
1016
1017        tasklet_kill(&local->tx_pending_tasklet);
1018        tasklet_kill(&local->tasklet);
1019
1020        pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1021                               &local->network_latency_notifier);
1022#ifdef CONFIG_INET
1023        unregister_inetaddr_notifier(&local->ifa_notifier);
1024#endif
1025
1026        rtnl_lock();
1027
1028        /*
1029         * At this point, interface list manipulations are fine
1030         * because the driver cannot be handing us frames any
1031         * more and the tasklet is killed.
1032         */
1033        ieee80211_remove_interfaces(local);
1034
1035        rtnl_unlock();
1036
1037        cancel_work_sync(&local->restart_work);
1038        cancel_work_sync(&local->reconfig_filter);
1039
1040        ieee80211_clear_tx_pending(local);
1041        rate_control_deinitialize(local);
1042
1043        if (skb_queue_len(&local->skb_queue) ||
1044            skb_queue_len(&local->skb_queue_unreliable))
1045                wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1046        skb_queue_purge(&local->skb_queue);
1047        skb_queue_purge(&local->skb_queue_unreliable);
1048        skb_queue_purge(&local->rx_skb_queue);
1049
1050        destroy_workqueue(local->workqueue);
1051        wiphy_unregister(local->hw.wiphy);
1052        sta_info_stop(local);
1053        ieee80211_wep_free(local);
1054        ieee80211_led_exit(local);
1055        kfree(local->int_scan_req);
1056}
1057EXPORT_SYMBOL(ieee80211_unregister_hw);
1058
1059static int ieee80211_free_ack_frame(int id, void *p, void *data)
1060{
1061        WARN_ONCE(1, "Have pending ack frames!\n");
1062        kfree_skb(p);
1063        return 0;
1064}
1065
1066void ieee80211_free_hw(struct ieee80211_hw *hw)
1067{
1068        struct ieee80211_local *local = hw_to_local(hw);
1069
1070        mutex_destroy(&local->iflist_mtx);
1071        mutex_destroy(&local->mtx);
1072
1073        if (local->wiphy_ciphers_allocated)
1074                kfree(local->hw.wiphy->cipher_suites);
1075
1076        idr_for_each(&local->ack_status_frames,
1077                     ieee80211_free_ack_frame, NULL);
1078        idr_destroy(&local->ack_status_frames);
1079
1080        wiphy_free(local->hw.wiphy);
1081}
1082EXPORT_SYMBOL(ieee80211_free_hw);
1083
1084static int __init ieee80211_init(void)
1085{
1086        struct sk_buff *skb;
1087        int ret;
1088
1089        BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1090        BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1091                     IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1092
1093        ret = rc80211_minstrel_init();
1094        if (ret)
1095                return ret;
1096
1097        ret = rc80211_minstrel_ht_init();
1098        if (ret)
1099                goto err_minstrel;
1100
1101        ret = rc80211_pid_init();
1102        if (ret)
1103                goto err_pid;
1104
1105        ret = ieee80211_iface_init();
1106        if (ret)
1107                goto err_netdev;
1108
1109        return 0;
1110 err_netdev:
1111        rc80211_pid_exit();
1112 err_pid:
1113        rc80211_minstrel_ht_exit();
1114 err_minstrel:
1115        rc80211_minstrel_exit();
1116
1117        return ret;
1118}
1119
1120static void __exit ieee80211_exit(void)
1121{
1122        rc80211_pid_exit();
1123        rc80211_minstrel_ht_exit();
1124        rc80211_minstrel_exit();
1125
1126        if (mesh_allocated)
1127                ieee80211s_stop();
1128
1129        ieee80211_iface_exit();
1130
1131        rcu_barrier();
1132}
1133
1134
1135subsys_initcall(ieee80211_init);
1136module_exit(ieee80211_exit);
1137
1138MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1139MODULE_LICENSE("GPL");
1140
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