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                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
 191void 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
 264u32 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
 274static 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
 315static 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
 336void 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}
 358EXPORT_SYMBOL(ieee80211_restart_hw);
 359
 360static 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
 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};
 518
 519static 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
 532struct 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}
 684EXPORT_SYMBOL(ieee80211_alloc_hw);
 685
 686int 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}
1006EXPORT_SYMBOL(ieee80211_register_hw);
1007
1008void 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}
1052EXPORT_SYMBOL(ieee80211_unregister_hw);
1053
1054static 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
1061void 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}
1077EXPORT_SYMBOL(ieee80211_free_hw);
1078
1079static 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
1115static 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
1130subsys_initcall(ieee80211_init);
1131module_exit(ieee80211_exit);
1132
1133MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1134MODULE_LICENSE("GPL");
1135
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