linux/net/mac80211/util.c
<<
>>
Prefs
   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 * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 * utilities for mac80211
  12 */
  13
  14#include <net/mac80211.h>
  15#include <linux/netdevice.h>
  16#include <linux/types.h>
  17#include <linux/slab.h>
  18#include <linux/skbuff.h>
  19#include <linux/etherdevice.h>
  20#include <linux/if_arp.h>
  21#include <linux/wireless.h>
  22#include <linux/bitmap.h>
  23#include <net/net_namespace.h>
  24#include <net/cfg80211.h>
  25#include <net/rtnetlink.h>
  26
  27#include "ieee80211_i.h"
  28#include "rate.h"
  29#include "mesh.h"
  30#include "wme.h"
  31
  32/* privid for wiphys to determine whether they belong to us or not */
  33void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
  34
  35/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
  36/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  37const unsigned char rfc1042_header[] __aligned(2) =
  38        { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
  39
  40/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  41const unsigned char bridge_tunnel_header[] __aligned(2) =
  42        { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
  43
  44struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
  45{
  46        struct ieee80211_local *local;
  47        BUG_ON(!wiphy);
  48
  49        local = wiphy_priv(wiphy);
  50        return &local->hw;
  51}
  52EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
  53
  54u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
  55                        enum nl80211_iftype type)
  56{
  57        __le16 fc = hdr->frame_control;
  58
  59         /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
  60        if (len < 16)
  61                return NULL;
  62
  63        if (ieee80211_is_data(fc)) {
  64                if (len < 24) /* drop incorrect hdr len (data) */
  65                        return NULL;
  66
  67                if (ieee80211_has_a4(fc))
  68                        return NULL;
  69                if (ieee80211_has_tods(fc))
  70                        return hdr->addr1;
  71                if (ieee80211_has_fromds(fc))
  72                        return hdr->addr2;
  73
  74                return hdr->addr3;
  75        }
  76
  77        if (ieee80211_is_mgmt(fc)) {
  78                if (len < 24) /* drop incorrect hdr len (mgmt) */
  79                        return NULL;
  80                return hdr->addr3;
  81        }
  82
  83        if (ieee80211_is_ctl(fc)) {
  84                if(ieee80211_is_pspoll(fc))
  85                        return hdr->addr1;
  86
  87                if (ieee80211_is_back_req(fc)) {
  88                        switch (type) {
  89                        case NL80211_IFTYPE_STATION:
  90                                return hdr->addr2;
  91                        case NL80211_IFTYPE_AP:
  92                        case NL80211_IFTYPE_AP_VLAN:
  93                                return hdr->addr1;
  94                        default:
  95                                break; /* fall through to the return */
  96                        }
  97                }
  98        }
  99
 100        return NULL;
 101}
 102
 103unsigned int ieee80211_hdrlen(__le16 fc)
 104{
 105        unsigned int hdrlen = 24;
 106
 107        if (ieee80211_is_data(fc)) {
 108                if (ieee80211_has_a4(fc))
 109                        hdrlen = 30;
 110                if (ieee80211_is_data_qos(fc))
 111                        hdrlen += IEEE80211_QOS_CTL_LEN;
 112                goto out;
 113        }
 114
 115        if (ieee80211_is_ctl(fc)) {
 116                /*
 117                 * ACK and CTS are 10 bytes, all others 16. To see how
 118                 * to get this condition consider
 119                 *   subtype mask:   0b0000000011110000 (0x00F0)
 120                 *   ACK subtype:    0b0000000011010000 (0x00D0)
 121                 *   CTS subtype:    0b0000000011000000 (0x00C0)
 122                 *   bits that matter:         ^^^      (0x00E0)
 123                 *   value of those: 0b0000000011000000 (0x00C0)
 124                 */
 125                if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 126                        hdrlen = 10;
 127                else
 128                        hdrlen = 16;
 129        }
 130out:
 131        return hdrlen;
 132}
 133EXPORT_SYMBOL(ieee80211_hdrlen);
 134
 135unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 136{
 137        const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
 138        unsigned int hdrlen;
 139
 140        if (unlikely(skb->len < 10))
 141                return 0;
 142        hdrlen = ieee80211_hdrlen(hdr->frame_control);
 143        if (unlikely(hdrlen > skb->len))
 144                return 0;
 145        return hdrlen;
 146}
 147EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 148
 149int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 150{
 151        int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
 152        /* 7.1.3.5a.2 */
 153        switch (ae) {
 154        case 0:
 155                return 6;
 156        case 1:
 157                return 12;
 158        case 2:
 159                return 18;
 160        case 3:
 161                return 24;
 162        default:
 163                return 6;
 164        }
 165}
 166
 167void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 168{
 169        struct sk_buff *skb = tx->skb;
 170        struct ieee80211_hdr *hdr;
 171
 172        do {
 173                hdr = (struct ieee80211_hdr *) skb->data;
 174                hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 175        } while ((skb = skb->next));
 176}
 177
 178int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
 179                             int rate, int erp, int short_preamble)
 180{
 181        int dur;
 182
 183        /* calculate duration (in microseconds, rounded up to next higher
 184         * integer if it includes a fractional microsecond) to send frame of
 185         * len bytes (does not include FCS) at the given rate. Duration will
 186         * also include SIFS.
 187         *
 188         * rate is in 100 kbps, so divident is multiplied by 10 in the
 189         * DIV_ROUND_UP() operations.
 190         */
 191
 192        if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
 193                /*
 194                 * OFDM:
 195                 *
 196                 * N_DBPS = DATARATE x 4
 197                 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 198                 *      (16 = SIGNAL time, 6 = tail bits)
 199                 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 200                 *
 201                 * T_SYM = 4 usec
 202                 * 802.11a - 17.5.2: aSIFSTime = 16 usec
 203                 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 204                 *      signal ext = 6 usec
 205                 */
 206                dur = 16; /* SIFS + signal ext */
 207                dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
 208                dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
 209                dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
 210                                        4 * rate); /* T_SYM x N_SYM */
 211        } else {
 212                /*
 213                 * 802.11b or 802.11g with 802.11b compatibility:
 214                 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
 215                 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
 216                 *
 217                 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
 218                 * aSIFSTime = 10 usec
 219                 * aPreambleLength = 144 usec or 72 usec with short preamble
 220                 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
 221                 */
 222                dur = 10; /* aSIFSTime = 10 usec */
 223                dur += short_preamble ? (72 + 24) : (144 + 48);
 224
 225                dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
 226        }
 227
 228        return dur;
 229}
 230
 231/* Exported duration function for driver use */
 232__le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
 233                                        struct ieee80211_vif *vif,
 234                                        size_t frame_len,
 235                                        struct ieee80211_rate *rate)
 236{
 237        struct ieee80211_local *local = hw_to_local(hw);
 238        struct ieee80211_sub_if_data *sdata;
 239        u16 dur;
 240        int erp;
 241        bool short_preamble = false;
 242
 243        erp = 0;
 244        if (vif) {
 245                sdata = vif_to_sdata(vif);
 246                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 247                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 248                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 249        }
 250
 251        dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
 252                                       short_preamble);
 253
 254        return cpu_to_le16(dur);
 255}
 256EXPORT_SYMBOL(ieee80211_generic_frame_duration);
 257
 258__le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
 259                              struct ieee80211_vif *vif, size_t frame_len,
 260                              const struct ieee80211_tx_info *frame_txctl)
 261{
 262        struct ieee80211_local *local = hw_to_local(hw);
 263        struct ieee80211_rate *rate;
 264        struct ieee80211_sub_if_data *sdata;
 265        bool short_preamble;
 266        int erp;
 267        u16 dur;
 268        struct ieee80211_supported_band *sband;
 269
 270        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 271
 272        short_preamble = false;
 273
 274        rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 275
 276        erp = 0;
 277        if (vif) {
 278                sdata = vif_to_sdata(vif);
 279                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 280                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 281                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 282        }
 283
 284        /* CTS duration */
 285        dur = ieee80211_frame_duration(local, 10, rate->bitrate,
 286                                       erp, short_preamble);
 287        /* Data frame duration */
 288        dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
 289                                        erp, short_preamble);
 290        /* ACK duration */
 291        dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 292                                        erp, short_preamble);
 293
 294        return cpu_to_le16(dur);
 295}
 296EXPORT_SYMBOL(ieee80211_rts_duration);
 297
 298__le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
 299                                    struct ieee80211_vif *vif,
 300                                    size_t frame_len,
 301                                    const struct ieee80211_tx_info *frame_txctl)
 302{
 303        struct ieee80211_local *local = hw_to_local(hw);
 304        struct ieee80211_rate *rate;
 305        struct ieee80211_sub_if_data *sdata;
 306        bool short_preamble;
 307        int erp;
 308        u16 dur;
 309        struct ieee80211_supported_band *sband;
 310
 311        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 312
 313        short_preamble = false;
 314
 315        rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
 316        erp = 0;
 317        if (vif) {
 318                sdata = vif_to_sdata(vif);
 319                short_preamble = sdata->vif.bss_conf.use_short_preamble;
 320                if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 321                        erp = rate->flags & IEEE80211_RATE_ERP_G;
 322        }
 323
 324        /* Data frame duration */
 325        dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
 326                                       erp, short_preamble);
 327        if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
 328                /* ACK duration */
 329                dur += ieee80211_frame_duration(local, 10, rate->bitrate,
 330                                                erp, short_preamble);
 331        }
 332
 333        return cpu_to_le16(dur);
 334}
 335EXPORT_SYMBOL(ieee80211_ctstoself_duration);
 336
 337static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 338                                   enum queue_stop_reason reason)
 339{
 340        struct ieee80211_local *local = hw_to_local(hw);
 341
 342        if (WARN_ON(queue >= hw->queues))
 343                return;
 344
 345        __clear_bit(reason, &local->queue_stop_reasons[queue]);
 346
 347        if (!skb_queue_empty(&local->pending[queue]) &&
 348            local->queue_stop_reasons[queue] ==
 349                                BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
 350                tasklet_schedule(&local->tx_pending_tasklet);
 351
 352        if (local->queue_stop_reasons[queue] != 0)
 353                /* someone still has this queue stopped */
 354                return;
 355
 356        netif_wake_subqueue(local->mdev, queue);
 357}
 358
 359void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
 360                                    enum queue_stop_reason reason)
 361{
 362        struct ieee80211_local *local = hw_to_local(hw);
 363        unsigned long flags;
 364
 365        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 366        __ieee80211_wake_queue(hw, queue, reason);
 367        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 368}
 369
 370void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
 371{
 372        ieee80211_wake_queue_by_reason(hw, queue,
 373                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 374}
 375EXPORT_SYMBOL(ieee80211_wake_queue);
 376
 377static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 378                                   enum queue_stop_reason reason)
 379{
 380        struct ieee80211_local *local = hw_to_local(hw);
 381
 382        if (WARN_ON(queue >= hw->queues))
 383                return;
 384
 385        /*
 386         * Only stop if it was previously running, this is necessary
 387         * for correct pending packets handling because there we may
 388         * start (but not wake) the queue and rely on that.
 389         */
 390        if (!local->queue_stop_reasons[queue])
 391                netif_stop_subqueue(local->mdev, queue);
 392
 393        __set_bit(reason, &local->queue_stop_reasons[queue]);
 394}
 395
 396void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
 397                                    enum queue_stop_reason reason)
 398{
 399        struct ieee80211_local *local = hw_to_local(hw);
 400        unsigned long flags;
 401
 402        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 403        __ieee80211_stop_queue(hw, queue, reason);
 404        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 405}
 406
 407void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
 408{
 409        ieee80211_stop_queue_by_reason(hw, queue,
 410                                       IEEE80211_QUEUE_STOP_REASON_DRIVER);
 411}
 412EXPORT_SYMBOL(ieee80211_stop_queue);
 413
 414void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
 415                                    enum queue_stop_reason reason)
 416{
 417        struct ieee80211_local *local = hw_to_local(hw);
 418        unsigned long flags;
 419        int i;
 420
 421        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 422
 423        for (i = 0; i < hw->queues; i++)
 424                __ieee80211_stop_queue(hw, i, reason);
 425
 426        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 427}
 428
 429void ieee80211_stop_queues(struct ieee80211_hw *hw)
 430{
 431        ieee80211_stop_queues_by_reason(hw,
 432                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
 433}
 434EXPORT_SYMBOL(ieee80211_stop_queues);
 435
 436int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
 437{
 438        struct ieee80211_local *local = hw_to_local(hw);
 439
 440        if (WARN_ON(queue >= hw->queues))
 441                return true;
 442
 443        return __netif_subqueue_stopped(local->mdev, queue);
 444}
 445EXPORT_SYMBOL(ieee80211_queue_stopped);
 446
 447void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
 448                                     enum queue_stop_reason reason)
 449{
 450        struct ieee80211_local *local = hw_to_local(hw);
 451        unsigned long flags;
 452        int i;
 453
 454        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 455
 456        for (i = 0; i < hw->queues; i++)
 457                __ieee80211_wake_queue(hw, i, reason);
 458
 459        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 460}
 461
 462void ieee80211_wake_queues(struct ieee80211_hw *hw)
 463{
 464        ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
 465}
 466EXPORT_SYMBOL(ieee80211_wake_queues);
 467
 468void ieee80211_iterate_active_interfaces(
 469        struct ieee80211_hw *hw,
 470        void (*iterator)(void *data, u8 *mac,
 471                         struct ieee80211_vif *vif),
 472        void *data)
 473{
 474        struct ieee80211_local *local = hw_to_local(hw);
 475        struct ieee80211_sub_if_data *sdata;
 476
 477        mutex_lock(&local->iflist_mtx);
 478
 479        list_for_each_entry(sdata, &local->interfaces, list) {
 480                switch (sdata->vif.type) {
 481                case __NL80211_IFTYPE_AFTER_LAST:
 482                case NL80211_IFTYPE_UNSPECIFIED:
 483                case NL80211_IFTYPE_MONITOR:
 484                case NL80211_IFTYPE_AP_VLAN:
 485                        continue;
 486                case NL80211_IFTYPE_AP:
 487                case NL80211_IFTYPE_STATION:
 488                case NL80211_IFTYPE_ADHOC:
 489                case NL80211_IFTYPE_WDS:
 490                case NL80211_IFTYPE_MESH_POINT:
 491                        break;
 492                }
 493                if (netif_running(sdata->dev))
 494                        iterator(data, sdata->dev->dev_addr,
 495                                 &sdata->vif);
 496        }
 497
 498        mutex_unlock(&local->iflist_mtx);
 499}
 500EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
 501
 502void ieee80211_iterate_active_interfaces_atomic(
 503        struct ieee80211_hw *hw,
 504        void (*iterator)(void *data, u8 *mac,
 505                         struct ieee80211_vif *vif),
 506        void *data)
 507{
 508        struct ieee80211_local *local = hw_to_local(hw);
 509        struct ieee80211_sub_if_data *sdata;
 510
 511        rcu_read_lock();
 512
 513        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 514                switch (sdata->vif.type) {
 515                case __NL80211_IFTYPE_AFTER_LAST:
 516                case NL80211_IFTYPE_UNSPECIFIED:
 517                case NL80211_IFTYPE_MONITOR:
 518                case NL80211_IFTYPE_AP_VLAN:
 519                        continue;
 520                case NL80211_IFTYPE_AP:
 521                case NL80211_IFTYPE_STATION:
 522                case NL80211_IFTYPE_ADHOC:
 523                case NL80211_IFTYPE_WDS:
 524                case NL80211_IFTYPE_MESH_POINT:
 525                        break;
 526                }
 527                if (netif_running(sdata->dev))
 528                        iterator(data, sdata->dev->dev_addr,
 529                                 &sdata->vif);
 530        }
 531
 532        rcu_read_unlock();
 533}
 534EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
 535
 536void ieee802_11_parse_elems(u8 *start, size_t len,
 537                            struct ieee802_11_elems *elems)
 538{
 539        size_t left = len;
 540        u8 *pos = start;
 541
 542        memset(elems, 0, sizeof(*elems));
 543        elems->ie_start = start;
 544        elems->total_len = len;
 545
 546        while (left >= 2) {
 547                u8 id, elen;
 548
 549                id = *pos++;
 550                elen = *pos++;
 551                left -= 2;
 552
 553                if (elen > left)
 554                        return;
 555
 556                switch (id) {
 557                case WLAN_EID_SSID:
 558                        elems->ssid = pos;
 559                        elems->ssid_len = elen;
 560                        break;
 561                case WLAN_EID_SUPP_RATES:
 562                        elems->supp_rates = pos;
 563                        elems->supp_rates_len = elen;
 564                        break;
 565                case WLAN_EID_FH_PARAMS:
 566                        elems->fh_params = pos;
 567                        elems->fh_params_len = elen;
 568                        break;
 569                case WLAN_EID_DS_PARAMS:
 570                        elems->ds_params = pos;
 571                        elems->ds_params_len = elen;
 572                        break;
 573                case WLAN_EID_CF_PARAMS:
 574                        elems->cf_params = pos;
 575                        elems->cf_params_len = elen;
 576                        break;
 577                case WLAN_EID_TIM:
 578                        elems->tim = pos;
 579                        elems->tim_len = elen;
 580                        break;
 581                case WLAN_EID_IBSS_PARAMS:
 582                        elems->ibss_params = pos;
 583                        elems->ibss_params_len = elen;
 584                        break;
 585                case WLAN_EID_CHALLENGE:
 586                        elems->challenge = pos;
 587                        elems->challenge_len = elen;
 588                        break;
 589                case WLAN_EID_WPA:
 590                        if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
 591                            pos[2] == 0xf2) {
 592                                /* Microsoft OUI (00:50:F2) */
 593                                if (pos[3] == 1) {
 594                                        /* OUI Type 1 - WPA IE */
 595                                        elems->wpa = pos;
 596                                        elems->wpa_len = elen;
 597                                } else if (elen >= 5 && pos[3] == 2) {
 598                                        if (pos[4] == 0) {
 599                                                elems->wmm_info = pos;
 600                                                elems->wmm_info_len = elen;
 601                                        } else if (pos[4] == 1) {
 602                                                elems->wmm_param = pos;
 603                                                elems->wmm_param_len = elen;
 604                                        }
 605                                }
 606                        }
 607                        break;
 608                case WLAN_EID_RSN:
 609                        elems->rsn = pos;
 610                        elems->rsn_len = elen;
 611                        break;
 612                case WLAN_EID_ERP_INFO:
 613                        elems->erp_info = pos;
 614                        elems->erp_info_len = elen;
 615                        break;
 616                case WLAN_EID_EXT_SUPP_RATES:
 617                        elems->ext_supp_rates = pos;
 618                        elems->ext_supp_rates_len = elen;
 619                        break;
 620                case WLAN_EID_HT_CAPABILITY:
 621                        if (elen >= sizeof(struct ieee80211_ht_cap))
 622                                elems->ht_cap_elem = (void *)pos;
 623                        break;
 624                case WLAN_EID_HT_INFORMATION:
 625                        if (elen >= sizeof(struct ieee80211_ht_info))
 626                                elems->ht_info_elem = (void *)pos;
 627                        break;
 628                case WLAN_EID_MESH_ID:
 629                        elems->mesh_id = pos;
 630                        elems->mesh_id_len = elen;
 631                        break;
 632                case WLAN_EID_MESH_CONFIG:
 633                        elems->mesh_config = pos;
 634                        elems->mesh_config_len = elen;
 635                        break;
 636                case WLAN_EID_PEER_LINK:
 637                        elems->peer_link = pos;
 638                        elems->peer_link_len = elen;
 639                        break;
 640                case WLAN_EID_PREQ:
 641                        elems->preq = pos;
 642                        elems->preq_len = elen;
 643                        break;
 644                case WLAN_EID_PREP:
 645                        elems->prep = pos;
 646                        elems->prep_len = elen;
 647                        break;
 648                case WLAN_EID_PERR:
 649                        elems->perr = pos;
 650                        elems->perr_len = elen;
 651                        break;
 652                case WLAN_EID_CHANNEL_SWITCH:
 653                        elems->ch_switch_elem = pos;
 654                        elems->ch_switch_elem_len = elen;
 655                        break;
 656                case WLAN_EID_QUIET:
 657                        if (!elems->quiet_elem) {
 658                                elems->quiet_elem = pos;
 659                                elems->quiet_elem_len = elen;
 660                        }
 661                        elems->num_of_quiet_elem++;
 662                        break;
 663                case WLAN_EID_COUNTRY:
 664                        elems->country_elem = pos;
 665                        elems->country_elem_len = elen;
 666                        break;
 667                case WLAN_EID_PWR_CONSTRAINT:
 668                        elems->pwr_constr_elem = pos;
 669                        elems->pwr_constr_elem_len = elen;
 670                        break;
 671                case WLAN_EID_TIMEOUT_INTERVAL:
 672                        elems->timeout_int = pos;
 673                        elems->timeout_int_len = elen;
 674                        break;
 675                default:
 676                        break;
 677                }
 678
 679                left -= elen;
 680                pos += elen;
 681        }
 682}
 683
 684void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
 685{
 686        struct ieee80211_local *local = sdata->local;
 687        struct ieee80211_tx_queue_params qparam;
 688        int i;
 689
 690        if (!local->ops->conf_tx)
 691                return;
 692
 693        memset(&qparam, 0, sizeof(qparam));
 694
 695        qparam.aifs = 2;
 696
 697        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 698            !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
 699                qparam.cw_min = 31;
 700        else
 701                qparam.cw_min = 15;
 702
 703        qparam.cw_max = 1023;
 704        qparam.txop = 0;
 705
 706        for (i = 0; i < local_to_hw(local)->queues; i++)
 707                local->ops->conf_tx(local_to_hw(local), i, &qparam);
 708}
 709
 710void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
 711                                  const size_t supp_rates_len,
 712                                  const u8 *supp_rates)
 713{
 714        struct ieee80211_local *local = sdata->local;
 715        int i, have_higher_than_11mbit = 0;
 716
 717        /* cf. IEEE 802.11 9.2.12 */
 718        for (i = 0; i < supp_rates_len; i++)
 719                if ((supp_rates[i] & 0x7f) * 5 > 110)
 720                        have_higher_than_11mbit = 1;
 721
 722        if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
 723            have_higher_than_11mbit)
 724                sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
 725        else
 726                sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
 727
 728        ieee80211_set_wmm_default(sdata);
 729}
 730
 731void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
 732                      int encrypt)
 733{
 734        skb->dev = sdata->local->mdev;
 735        skb_set_mac_header(skb, 0);
 736        skb_set_network_header(skb, 0);
 737        skb_set_transport_header(skb, 0);
 738
 739        skb->iif = sdata->dev->ifindex;
 740        skb->do_not_encrypt = !encrypt;
 741
 742        dev_queue_xmit(skb);
 743}
 744
 745int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
 746{
 747        int ret = -EINVAL;
 748        struct ieee80211_channel *chan;
 749        struct ieee80211_local *local = sdata->local;
 750
 751        chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
 752
 753        if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
 754                if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 755                    chan->flags & IEEE80211_CHAN_NO_IBSS)
 756                        return ret;
 757                local->oper_channel = chan;
 758                local->oper_channel_type = NL80211_CHAN_NO_HT;
 759
 760                if (local->sw_scanning || local->hw_scanning)
 761                        ret = 0;
 762                else
 763                        ret = ieee80211_hw_config(
 764                                local, IEEE80211_CONF_CHANGE_CHANNEL);
 765        }
 766
 767        return ret;
 768}
 769
 770u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
 771                              enum ieee80211_band band)
 772{
 773        struct ieee80211_supported_band *sband;
 774        struct ieee80211_rate *bitrates;
 775        u32 mandatory_rates;
 776        enum ieee80211_rate_flags mandatory_flag;
 777        int i;
 778
 779        sband = local->hw.wiphy->bands[band];
 780        if (!sband) {
 781                WARN_ON(1);
 782                sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 783        }
 784
 785        if (band == IEEE80211_BAND_2GHZ)
 786                mandatory_flag = IEEE80211_RATE_MANDATORY_B;
 787        else
 788                mandatory_flag = IEEE80211_RATE_MANDATORY_A;
 789
 790        bitrates = sband->bitrates;
 791        mandatory_rates = 0;
 792        for (i = 0; i < sband->n_bitrates; i++)
 793                if (bitrates[i].flags & mandatory_flag)
 794                        mandatory_rates |= BIT(i);
 795        return mandatory_rates;
 796}
 797
 798void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
 799                         u16 transaction, u16 auth_alg,
 800                         u8 *extra, size_t extra_len,
 801                         const u8 *bssid, int encrypt)
 802{
 803        struct ieee80211_local *local = sdata->local;
 804        struct sk_buff *skb;
 805        struct ieee80211_mgmt *mgmt;
 806
 807        skb = dev_alloc_skb(local->hw.extra_tx_headroom +
 808                            sizeof(*mgmt) + 6 + extra_len);
 809        if (!skb) {
 810                printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
 811                       "frame\n", sdata->dev->name);
 812                return;
 813        }
 814        skb_reserve(skb, local->hw.extra_tx_headroom);
 815
 816        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
 817        memset(mgmt, 0, 24 + 6);
 818        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 819                                          IEEE80211_STYPE_AUTH);
 820        if (encrypt)
 821                mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 822        memcpy(mgmt->da, bssid, ETH_ALEN);
 823        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 824        memcpy(mgmt->bssid, bssid, ETH_ALEN);
 825        mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
 826        mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
 827        mgmt->u.auth.status_code = cpu_to_le16(0);
 828        if (extra)
 829                memcpy(skb_put(skb, extra_len), extra, extra_len);
 830
 831        ieee80211_tx_skb(sdata, skb, encrypt);
 832}
 833
 834void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
 835                              u8 *ssid, size_t ssid_len,
 836                              u8 *ie, size_t ie_len)
 837{
 838        struct ieee80211_local *local = sdata->local;
 839        struct ieee80211_supported_band *sband;
 840        struct sk_buff *skb;
 841        struct ieee80211_mgmt *mgmt;
 842        u8 *pos, *supp_rates, *esupp_rates = NULL;
 843        int i;
 844
 845        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
 846                            ie_len);
 847        if (!skb) {
 848                printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
 849                       "request\n", sdata->dev->name);
 850                return;
 851        }
 852        skb_reserve(skb, local->hw.extra_tx_headroom);
 853
 854        mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 855        memset(mgmt, 0, 24);
 856        mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 857                                          IEEE80211_STYPE_PROBE_REQ);
 858        memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 859        if (dst) {
 860                memcpy(mgmt->da, dst, ETH_ALEN);
 861                memcpy(mgmt->bssid, dst, ETH_ALEN);
 862        } else {
 863                memset(mgmt->da, 0xff, ETH_ALEN);
 864                memset(mgmt->bssid, 0xff, ETH_ALEN);
 865        }
 866        pos = skb_put(skb, 2 + ssid_len);
 867        *pos++ = WLAN_EID_SSID;
 868        *pos++ = ssid_len;
 869        memcpy(pos, ssid, ssid_len);
 870
 871        supp_rates = skb_put(skb, 2);
 872        supp_rates[0] = WLAN_EID_SUPP_RATES;
 873        supp_rates[1] = 0;
 874        sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 875
 876        for (i = 0; i < sband->n_bitrates; i++) {
 877                struct ieee80211_rate *rate = &sband->bitrates[i];
 878                if (esupp_rates) {
 879                        pos = skb_put(skb, 1);
 880                        esupp_rates[1]++;
 881                } else if (supp_rates[1] == 8) {
 882                        esupp_rates = skb_put(skb, 3);
 883                        esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
 884                        esupp_rates[1] = 1;
 885                        pos = &esupp_rates[2];
 886                } else {
 887                        pos = skb_put(skb, 1);
 888                        supp_rates[1]++;
 889                }
 890                *pos = rate->bitrate / 5;
 891        }
 892
 893        if (ie)
 894                memcpy(skb_put(skb, ie_len), ie, ie_len);
 895
 896        ieee80211_tx_skb(sdata, skb, 0);
 897}
 898
 899u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
 900                            struct ieee802_11_elems *elems,
 901                            enum ieee80211_band band)
 902{
 903        struct ieee80211_supported_band *sband;
 904        struct ieee80211_rate *bitrates;
 905        size_t num_rates;
 906        u32 supp_rates;
 907        int i, j;
 908        sband = local->hw.wiphy->bands[band];
 909
 910        if (!sband) {
 911                WARN_ON(1);
 912                sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 913        }
 914
 915        bitrates = sband->bitrates;
 916        num_rates = sband->n_bitrates;
 917        supp_rates = 0;
 918        for (i = 0; i < elems->supp_rates_len +
 919                     elems->ext_supp_rates_len; i++) {
 920                u8 rate = 0;
 921                int own_rate;
 922                if (i < elems->supp_rates_len)
 923                        rate = elems->supp_rates[i];
 924                else if (elems->ext_supp_rates)
 925                        rate = elems->ext_supp_rates
 926                                [i - elems->supp_rates_len];
 927                own_rate = 5 * (rate & 0x7f);
 928                for (j = 0; j < num_rates; j++)
 929                        if (bitrates[j].bitrate == own_rate)
 930                                supp_rates |= BIT(j);
 931        }
 932        return supp_rates;
 933}
 934