linux/net/mac80211/tx.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 * 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 *
  12 * Transmit and frame generation functions.
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/slab.h>
  17#include <linux/skbuff.h>
  18#include <linux/etherdevice.h>
  19#include <linux/bitmap.h>
  20#include <linux/rcupdate.h>
  21#include <linux/export.h>
  22#include <net/net_namespace.h>
  23#include <net/ieee80211_radiotap.h>
  24#include <net/cfg80211.h>
  25#include <net/mac80211.h>
  26#include <asm/unaligned.h>
  27
  28#include "ieee80211_i.h"
  29#include "driver-ops.h"
  30#include "led.h"
  31#include "mesh.h"
  32#include "wep.h"
  33#include "wpa.h"
  34#include "wme.h"
  35#include "rate.h"
  36
  37/* misc utils */
  38
  39static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
  40                                 struct sk_buff *skb, int group_addr,
  41                                 int next_frag_len)
  42{
  43        int rate, mrate, erp, dur, i;
  44        struct ieee80211_rate *txrate;
  45        struct ieee80211_local *local = tx->local;
  46        struct ieee80211_supported_band *sband;
  47        struct ieee80211_hdr *hdr;
  48        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  49
  50        /* assume HW handles this */
  51        if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS)
  52                return 0;
  53
  54        /* uh huh? */
  55        if (WARN_ON_ONCE(info->control.rates[0].idx < 0))
  56                return 0;
  57
  58        sband = local->hw.wiphy->bands[tx->channel->band];
  59        txrate = &sband->bitrates[info->control.rates[0].idx];
  60
  61        erp = txrate->flags & IEEE80211_RATE_ERP_G;
  62
  63        /*
  64         * data and mgmt (except PS Poll):
  65         * - during CFP: 32768
  66         * - during contention period:
  67         *   if addr1 is group address: 0
  68         *   if more fragments = 0 and addr1 is individual address: time to
  69         *      transmit one ACK plus SIFS
  70         *   if more fragments = 1 and addr1 is individual address: time to
  71         *      transmit next fragment plus 2 x ACK plus 3 x SIFS
  72         *
  73         * IEEE 802.11, 9.6:
  74         * - control response frame (CTS or ACK) shall be transmitted using the
  75         *   same rate as the immediately previous frame in the frame exchange
  76         *   sequence, if this rate belongs to the PHY mandatory rates, or else
  77         *   at the highest possible rate belonging to the PHY rates in the
  78         *   BSSBasicRateSet
  79         */
  80        hdr = (struct ieee80211_hdr *)skb->data;
  81        if (ieee80211_is_ctl(hdr->frame_control)) {
  82                /* TODO: These control frames are not currently sent by
  83                 * mac80211, but should they be implemented, this function
  84                 * needs to be updated to support duration field calculation.
  85                 *
  86                 * RTS: time needed to transmit pending data/mgmt frame plus
  87                 *    one CTS frame plus one ACK frame plus 3 x SIFS
  88                 * CTS: duration of immediately previous RTS minus time
  89                 *    required to transmit CTS and its SIFS
  90                 * ACK: 0 if immediately previous directed data/mgmt had
  91                 *    more=0, with more=1 duration in ACK frame is duration
  92                 *    from previous frame minus time needed to transmit ACK
  93                 *    and its SIFS
  94                 * PS Poll: BIT(15) | BIT(14) | aid
  95                 */
  96                return 0;
  97        }
  98
  99        /* data/mgmt */
 100        if (0 /* FIX: data/mgmt during CFP */)
 101                return cpu_to_le16(32768);
 102
 103        if (group_addr) /* Group address as the destination - no ACK */
 104                return 0;
 105
 106        /* Individual destination address:
 107         * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
 108         * CTS and ACK frames shall be transmitted using the highest rate in
 109         * basic rate set that is less than or equal to the rate of the
 110         * immediately previous frame and that is using the same modulation
 111         * (CCK or OFDM). If no basic rate set matches with these requirements,
 112         * the highest mandatory rate of the PHY that is less than or equal to
 113         * the rate of the previous frame is used.
 114         * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
 115         */
 116        rate = -1;
 117        /* use lowest available if everything fails */
 118        mrate = sband->bitrates[0].bitrate;
 119        for (i = 0; i < sband->n_bitrates; i++) {
 120                struct ieee80211_rate *r = &sband->bitrates[i];
 121
 122                if (r->bitrate > txrate->bitrate)
 123                        break;
 124
 125                if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
 126                        rate = r->bitrate;
 127
 128                switch (sband->band) {
 129                case IEEE80211_BAND_2GHZ: {
 130                        u32 flag;
 131                        if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
 132                                flag = IEEE80211_RATE_MANDATORY_G;
 133                        else
 134                                flag = IEEE80211_RATE_MANDATORY_B;
 135                        if (r->flags & flag)
 136                                mrate = r->bitrate;
 137                        break;
 138                }
 139                case IEEE80211_BAND_5GHZ:
 140                        if (r->flags & IEEE80211_RATE_MANDATORY_A)
 141                                mrate = r->bitrate;
 142                        break;
 143                case IEEE80211_BAND_60GHZ:
 144                        /* TODO, for now fall through */
 145                case IEEE80211_NUM_BANDS:
 146                        WARN_ON(1);
 147                        break;
 148                }
 149        }
 150        if (rate == -1) {
 151                /* No matching basic rate found; use highest suitable mandatory
 152                 * PHY rate */
 153                rate = mrate;
 154        }
 155
 156        /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
 157        if (ieee80211_is_data_qos(hdr->frame_control) &&
 158            *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
 159                dur = 0;
 160        else
 161                /* Time needed to transmit ACK
 162                 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
 163                 * to closest integer */
 164                dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
 165                                tx->sdata->vif.bss_conf.use_short_preamble);
 166
 167        if (next_frag_len) {
 168                /* Frame is fragmented: duration increases with time needed to
 169                 * transmit next fragment plus ACK and 2 x SIFS. */
 170                dur *= 2; /* ACK + SIFS */
 171                /* next fragment */
 172                dur += ieee80211_frame_duration(sband->band, next_frag_len,
 173                                txrate->bitrate, erp,
 174                                tx->sdata->vif.bss_conf.use_short_preamble);
 175        }
 176
 177        return cpu_to_le16(dur);
 178}
 179
 180/* tx handlers */
 181static ieee80211_tx_result debug_noinline
 182ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
 183{
 184        struct ieee80211_local *local = tx->local;
 185        struct ieee80211_if_managed *ifmgd;
 186
 187        /* driver doesn't support power save */
 188        if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
 189                return TX_CONTINUE;
 190
 191        /* hardware does dynamic power save */
 192        if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
 193                return TX_CONTINUE;
 194
 195        /* dynamic power save disabled */
 196        if (local->hw.conf.dynamic_ps_timeout <= 0)
 197                return TX_CONTINUE;
 198
 199        /* we are scanning, don't enable power save */
 200        if (local->scanning)
 201                return TX_CONTINUE;
 202
 203        if (!local->ps_sdata)
 204                return TX_CONTINUE;
 205
 206        /* No point if we're going to suspend */
 207        if (local->quiescing)
 208                return TX_CONTINUE;
 209
 210        /* dynamic ps is supported only in managed mode */
 211        if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
 212                return TX_CONTINUE;
 213
 214        ifmgd = &tx->sdata->u.mgd;
 215
 216        /*
 217         * Don't wakeup from power save if u-apsd is enabled, voip ac has
 218         * u-apsd enabled and the frame is in voip class. This effectively
 219         * means that even if all access categories have u-apsd enabled, in
 220         * practise u-apsd is only used with the voip ac. This is a
 221         * workaround for the case when received voip class packets do not
 222         * have correct qos tag for some reason, due the network or the
 223         * peer application.
 224         *
 225         * Note: ifmgd->uapsd_queues access is racy here. If the value is
 226         * changed via debugfs, user needs to reassociate manually to have
 227         * everything in sync.
 228         */
 229        if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
 230            (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
 231            skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
 232                return TX_CONTINUE;
 233
 234        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
 235                ieee80211_stop_queues_by_reason(&local->hw,
 236                                                IEEE80211_QUEUE_STOP_REASON_PS);
 237                ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
 238                ieee80211_queue_work(&local->hw,
 239                                     &local->dynamic_ps_disable_work);
 240        }
 241
 242        /* Don't restart the timer if we're not disassociated */
 243        if (!ifmgd->associated)
 244                return TX_CONTINUE;
 245
 246        mod_timer(&local->dynamic_ps_timer, jiffies +
 247                  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
 248
 249        return TX_CONTINUE;
 250}
 251
 252static ieee80211_tx_result debug_noinline
 253ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
 254{
 255
 256        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 257        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 258        bool assoc = false;
 259
 260        if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
 261                return TX_CONTINUE;
 262
 263        if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
 264            test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
 265            !ieee80211_is_probe_req(hdr->frame_control) &&
 266            !ieee80211_is_nullfunc(hdr->frame_control))
 267                /*
 268                 * When software scanning only nullfunc frames (to notify
 269                 * the sleep state to the AP) and probe requests (for the
 270                 * active scan) are allowed, all other frames should not be
 271                 * sent and we should not get here, but if we do
 272                 * nonetheless, drop them to avoid sending them
 273                 * off-channel. See the link below and
 274                 * ieee80211_start_scan() for more.
 275                 *
 276                 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
 277                 */
 278                return TX_DROP;
 279
 280        if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
 281                return TX_CONTINUE;
 282
 283        if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 284                return TX_CONTINUE;
 285
 286        if (tx->flags & IEEE80211_TX_PS_BUFFERED)
 287                return TX_CONTINUE;
 288
 289        if (tx->sta)
 290                assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
 291
 292        if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
 293                if (unlikely(!assoc &&
 294                             ieee80211_is_data(hdr->frame_control))) {
 295#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 296                        sdata_info(tx->sdata,
 297                                   "dropped data frame to not associated station %pM\n",
 298                                   hdr->addr1);
 299#endif
 300                        I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
 301                        return TX_DROP;
 302                }
 303        } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP &&
 304                            ieee80211_is_data(hdr->frame_control) &&
 305                            !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) {
 306                /*
 307                 * No associated STAs - no need to send multicast
 308                 * frames.
 309                 */
 310                return TX_DROP;
 311        }
 312
 313        return TX_CONTINUE;
 314}
 315
 316/* This function is called whenever the AP is about to exceed the maximum limit
 317 * of buffered frames for power saving STAs. This situation should not really
 318 * happen often during normal operation, so dropping the oldest buffered packet
 319 * from each queue should be OK to make some room for new frames. */
 320static void purge_old_ps_buffers(struct ieee80211_local *local)
 321{
 322        int total = 0, purged = 0;
 323        struct sk_buff *skb;
 324        struct ieee80211_sub_if_data *sdata;
 325        struct sta_info *sta;
 326
 327        /*
 328         * virtual interfaces are protected by RCU
 329         */
 330        rcu_read_lock();
 331
 332        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 333                struct ieee80211_if_ap *ap;
 334                if (sdata->vif.type != NL80211_IFTYPE_AP)
 335                        continue;
 336                ap = &sdata->u.ap;
 337                skb = skb_dequeue(&ap->ps_bc_buf);
 338                if (skb) {
 339                        purged++;
 340                        dev_kfree_skb(skb);
 341                }
 342                total += skb_queue_len(&ap->ps_bc_buf);
 343        }
 344
 345        /*
 346         * Drop one frame from each station from the lowest-priority
 347         * AC that has frames at all.
 348         */
 349        list_for_each_entry_rcu(sta, &local->sta_list, list) {
 350                int ac;
 351
 352                for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
 353                        skb = skb_dequeue(&sta->ps_tx_buf[ac]);
 354                        total += skb_queue_len(&sta->ps_tx_buf[ac]);
 355                        if (skb) {
 356                                purged++;
 357                                ieee80211_free_txskb(&local->hw, skb);
 358                                break;
 359                        }
 360                }
 361        }
 362
 363        rcu_read_unlock();
 364
 365        local->total_ps_buffered = total;
 366        ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
 367}
 368
 369static ieee80211_tx_result
 370ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
 371{
 372        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 373        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 374
 375        /*
 376         * broadcast/multicast frame
 377         *
 378         * If any of the associated stations is in power save mode,
 379         * the frame is buffered to be sent after DTIM beacon frame.
 380         * This is done either by the hardware or us.
 381         */
 382
 383        /* powersaving STAs only in AP/VLAN mode */
 384        if (!tx->sdata->bss)
 385                return TX_CONTINUE;
 386
 387        /* no buffering for ordered frames */
 388        if (ieee80211_has_order(hdr->frame_control))
 389                return TX_CONTINUE;
 390
 391        /* no stations in PS mode */
 392        if (!atomic_read(&tx->sdata->bss->num_sta_ps))
 393                return TX_CONTINUE;
 394
 395        info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
 396        if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 397                info->hw_queue = tx->sdata->vif.cab_queue;
 398
 399        /* device releases frame after DTIM beacon */
 400        if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
 401                return TX_CONTINUE;
 402
 403        /* buffered in mac80211 */
 404        if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
 405                purge_old_ps_buffers(tx->local);
 406
 407        if (skb_queue_len(&tx->sdata->bss->ps_bc_buf) >= AP_MAX_BC_BUFFER) {
 408                ps_dbg(tx->sdata,
 409                       "BC TX buffer full - dropping the oldest frame\n");
 410                dev_kfree_skb(skb_dequeue(&tx->sdata->bss->ps_bc_buf));
 411        } else
 412                tx->local->total_ps_buffered++;
 413
 414        skb_queue_tail(&tx->sdata->bss->ps_bc_buf, tx->skb);
 415
 416        return TX_QUEUED;
 417}
 418
 419static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
 420                             struct sk_buff *skb)
 421{
 422        if (!ieee80211_is_mgmt(fc))
 423                return 0;
 424
 425        if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
 426                return 0;
 427
 428        if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *)
 429                                            skb->data))
 430                return 0;
 431
 432        return 1;
 433}
 434
 435static ieee80211_tx_result
 436ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
 437{
 438        struct sta_info *sta = tx->sta;
 439        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 440        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 441        struct ieee80211_local *local = tx->local;
 442
 443        if (unlikely(!sta))
 444                return TX_CONTINUE;
 445
 446        if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
 447                      test_sta_flag(sta, WLAN_STA_PS_DRIVER)) &&
 448                     !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
 449                int ac = skb_get_queue_mapping(tx->skb);
 450
 451                /* only deauth, disassoc and action are bufferable MMPDUs */
 452                if (ieee80211_is_mgmt(hdr->frame_control) &&
 453                    !ieee80211_is_deauth(hdr->frame_control) &&
 454                    !ieee80211_is_disassoc(hdr->frame_control) &&
 455                    !ieee80211_is_action(hdr->frame_control)) {
 456                        info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
 457                        return TX_CONTINUE;
 458                }
 459
 460                ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
 461                       sta->sta.addr, sta->sta.aid, ac);
 462                if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
 463                        purge_old_ps_buffers(tx->local);
 464                if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
 465                        struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
 466                        ps_dbg(tx->sdata,
 467                               "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
 468                               sta->sta.addr, ac);
 469                        ieee80211_free_txskb(&local->hw, old);
 470                } else
 471                        tx->local->total_ps_buffered++;
 472
 473                info->control.jiffies = jiffies;
 474                info->control.vif = &tx->sdata->vif;
 475                info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
 476                skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
 477
 478                if (!timer_pending(&local->sta_cleanup))
 479                        mod_timer(&local->sta_cleanup,
 480                                  round_jiffies(jiffies +
 481                                                STA_INFO_CLEANUP_INTERVAL));
 482
 483                /*
 484                 * We queued up some frames, so the TIM bit might
 485                 * need to be set, recalculate it.
 486                 */
 487                sta_info_recalc_tim(sta);
 488
 489                return TX_QUEUED;
 490        } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
 491                ps_dbg(tx->sdata,
 492                       "STA %pM in PS mode, but polling/in SP -> send frame\n",
 493                       sta->sta.addr);
 494        }
 495
 496        return TX_CONTINUE;
 497}
 498
 499static ieee80211_tx_result debug_noinline
 500ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
 501{
 502        if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
 503                return TX_CONTINUE;
 504
 505        if (tx->flags & IEEE80211_TX_UNICAST)
 506                return ieee80211_tx_h_unicast_ps_buf(tx);
 507        else
 508                return ieee80211_tx_h_multicast_ps_buf(tx);
 509}
 510
 511static ieee80211_tx_result debug_noinline
 512ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
 513{
 514        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 515
 516        if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol &&
 517                     tx->sdata->control_port_no_encrypt))
 518                info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 519
 520        return TX_CONTINUE;
 521}
 522
 523static ieee80211_tx_result debug_noinline
 524ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
 525{
 526        struct ieee80211_key *key;
 527        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 528        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 529
 530        if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT))
 531                tx->key = NULL;
 532        else if (tx->sta && (key = rcu_dereference(tx->sta->ptk)))
 533                tx->key = key;
 534        else if (ieee80211_is_mgmt(hdr->frame_control) &&
 535                 is_multicast_ether_addr(hdr->addr1) &&
 536                 ieee80211_is_robust_mgmt_frame(hdr) &&
 537                 (key = rcu_dereference(tx->sdata->default_mgmt_key)))
 538                tx->key = key;
 539        else if (is_multicast_ether_addr(hdr->addr1) &&
 540                 (key = rcu_dereference(tx->sdata->default_multicast_key)))
 541                tx->key = key;
 542        else if (!is_multicast_ether_addr(hdr->addr1) &&
 543                 (key = rcu_dereference(tx->sdata->default_unicast_key)))
 544                tx->key = key;
 545        else if (info->flags & IEEE80211_TX_CTL_INJECTED)
 546                tx->key = NULL;
 547        else if (!tx->sdata->drop_unencrypted)
 548                tx->key = NULL;
 549        else if (tx->skb->protocol == tx->sdata->control_port_protocol)
 550                tx->key = NULL;
 551        else if (ieee80211_is_robust_mgmt_frame(hdr) &&
 552                 !(ieee80211_is_action(hdr->frame_control) &&
 553                   tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP)))
 554                tx->key = NULL;
 555        else if (ieee80211_is_mgmt(hdr->frame_control) &&
 556                 !ieee80211_is_robust_mgmt_frame(hdr))
 557                tx->key = NULL;
 558        else {
 559                I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted);
 560                return TX_DROP;
 561        }
 562
 563        if (tx->key) {
 564                bool skip_hw = false;
 565
 566                tx->key->tx_rx_count++;
 567                /* TODO: add threshold stuff again */
 568
 569                switch (tx->key->conf.cipher) {
 570                case WLAN_CIPHER_SUITE_WEP40:
 571                case WLAN_CIPHER_SUITE_WEP104:
 572                case WLAN_CIPHER_SUITE_TKIP:
 573                        if (!ieee80211_is_data_present(hdr->frame_control))
 574                                tx->key = NULL;
 575                        break;
 576                case WLAN_CIPHER_SUITE_CCMP:
 577                        if (!ieee80211_is_data_present(hdr->frame_control) &&
 578                            !ieee80211_use_mfp(hdr->frame_control, tx->sta,
 579                                               tx->skb))
 580                                tx->key = NULL;
 581                        else
 582                                skip_hw = (tx->key->conf.flags &
 583                                           IEEE80211_KEY_FLAG_SW_MGMT) &&
 584                                        ieee80211_is_mgmt(hdr->frame_control);
 585                        break;
 586                case WLAN_CIPHER_SUITE_AES_CMAC:
 587                        if (!ieee80211_is_mgmt(hdr->frame_control))
 588                                tx->key = NULL;
 589                        break;
 590                }
 591
 592                if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED))
 593                        return TX_DROP;
 594
 595                if (!skip_hw && tx->key &&
 596                    tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
 597                        info->control.hw_key = &tx->key->conf;
 598        }
 599
 600        return TX_CONTINUE;
 601}
 602
 603static ieee80211_tx_result debug_noinline
 604ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
 605{
 606        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 607        struct ieee80211_hdr *hdr = (void *)tx->skb->data;
 608        struct ieee80211_supported_band *sband;
 609        struct ieee80211_rate *rate;
 610        int i;
 611        u32 len;
 612        bool inval = false, rts = false, short_preamble = false;
 613        struct ieee80211_tx_rate_control txrc;
 614        bool assoc = false;
 615
 616        memset(&txrc, 0, sizeof(txrc));
 617
 618        sband = tx->local->hw.wiphy->bands[tx->channel->band];
 619
 620        len = min_t(u32, tx->skb->len + FCS_LEN,
 621                         tx->local->hw.wiphy->frag_threshold);
 622
 623        /* set up the tx rate control struct we give the RC algo */
 624        txrc.hw = &tx->local->hw;
 625        txrc.sband = sband;
 626        txrc.bss_conf = &tx->sdata->vif.bss_conf;
 627        txrc.skb = tx->skb;
 628        txrc.reported_rate.idx = -1;
 629        txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
 630        if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
 631                txrc.max_rate_idx = -1;
 632        else
 633                txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
 634        memcpy(txrc.rate_idx_mcs_mask,
 635               tx->sdata->rc_rateidx_mcs_mask[tx->channel->band],
 636               sizeof(txrc.rate_idx_mcs_mask));
 637        txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
 638                    tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
 639                    tx->sdata->vif.type == NL80211_IFTYPE_ADHOC);
 640
 641        /* set up RTS protection if desired */
 642        if (len > tx->local->hw.wiphy->rts_threshold) {
 643                txrc.rts = rts = true;
 644        }
 645
 646        /*
 647         * Use short preamble if the BSS can handle it, but not for
 648         * management frames unless we know the receiver can handle
 649         * that -- the management frame might be to a station that
 650         * just wants a probe response.
 651         */
 652        if (tx->sdata->vif.bss_conf.use_short_preamble &&
 653            (ieee80211_is_data(hdr->frame_control) ||
 654             (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
 655                txrc.short_preamble = short_preamble = true;
 656
 657        if (tx->sta)
 658                assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
 659
 660        /*
 661         * Lets not bother rate control if we're associated and cannot
 662         * talk to the sta. This should not happen.
 663         */
 664        if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
 665                 !rate_usable_index_exists(sband, &tx->sta->sta),
 666                 "%s: Dropped data frame as no usable bitrate found while "
 667                 "scanning and associated. Target station: "
 668                 "%pM on %d GHz band\n",
 669                 tx->sdata->name, hdr->addr1,
 670                 tx->channel->band ? 5 : 2))
 671                return TX_DROP;
 672
 673        /*
 674         * If we're associated with the sta at this point we know we can at
 675         * least send the frame at the lowest bit rate.
 676         */
 677        rate_control_get_rate(tx->sdata, tx->sta, &txrc);
 678
 679        if (unlikely(info->control.rates[0].idx < 0))
 680                return TX_DROP;
 681
 682        if (txrc.reported_rate.idx < 0) {
 683                txrc.reported_rate = info->control.rates[0];
 684                if (tx->sta && ieee80211_is_data(hdr->frame_control))
 685                        tx->sta->last_tx_rate = txrc.reported_rate;
 686        } else if (tx->sta)
 687                tx->sta->last_tx_rate = txrc.reported_rate;
 688
 689        if (unlikely(!info->control.rates[0].count))
 690                info->control.rates[0].count = 1;
 691
 692        if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
 693                         (info->flags & IEEE80211_TX_CTL_NO_ACK)))
 694                info->control.rates[0].count = 1;
 695
 696        if (is_multicast_ether_addr(hdr->addr1)) {
 697                /*
 698                 * XXX: verify the rate is in the basic rateset
 699                 */
 700                return TX_CONTINUE;
 701        }
 702
 703        /*
 704         * set up the RTS/CTS rate as the fastest basic rate
 705         * that is not faster than the data rate
 706         *
 707         * XXX: Should this check all retry rates?
 708         */
 709        if (!(info->control.rates[0].flags & IEEE80211_TX_RC_MCS)) {
 710                s8 baserate = 0;
 711
 712                rate = &sband->bitrates[info->control.rates[0].idx];
 713
 714                for (i = 0; i < sband->n_bitrates; i++) {
 715                        /* must be a basic rate */
 716                        if (!(tx->sdata->vif.bss_conf.basic_rates & BIT(i)))
 717                                continue;
 718                        /* must not be faster than the data rate */
 719                        if (sband->bitrates[i].bitrate > rate->bitrate)
 720                                continue;
 721                        /* maximum */
 722                        if (sband->bitrates[baserate].bitrate <
 723                             sband->bitrates[i].bitrate)
 724                                baserate = i;
 725                }
 726
 727                info->control.rts_cts_rate_idx = baserate;
 728        }
 729
 730        for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 731                /*
 732                 * make sure there's no valid rate following
 733                 * an invalid one, just in case drivers don't
 734                 * take the API seriously to stop at -1.
 735                 */
 736                if (inval) {
 737                        info->control.rates[i].idx = -1;
 738                        continue;
 739                }
 740                if (info->control.rates[i].idx < 0) {
 741                        inval = true;
 742                        continue;
 743                }
 744
 745                /*
 746                 * For now assume MCS is already set up correctly, this
 747                 * needs to be fixed.
 748                 */
 749                if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) {
 750                        WARN_ON(info->control.rates[i].idx > 76);
 751                        continue;
 752                }
 753
 754                /* set up RTS protection if desired */
 755                if (rts)
 756                        info->control.rates[i].flags |=
 757                                IEEE80211_TX_RC_USE_RTS_CTS;
 758
 759                /* RC is busted */
 760                if (WARN_ON_ONCE(info->control.rates[i].idx >=
 761                                 sband->n_bitrates)) {
 762                        info->control.rates[i].idx = -1;
 763                        continue;
 764                }
 765
 766                rate = &sband->bitrates[info->control.rates[i].idx];
 767
 768                /* set up short preamble */
 769                if (short_preamble &&
 770                    rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
 771                        info->control.rates[i].flags |=
 772                                IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
 773
 774                /* set up G protection */
 775                if (!rts && tx->sdata->vif.bss_conf.use_cts_prot &&
 776                    rate->flags & IEEE80211_RATE_ERP_G)
 777                        info->control.rates[i].flags |=
 778                                IEEE80211_TX_RC_USE_CTS_PROTECT;
 779        }
 780
 781        return TX_CONTINUE;
 782}
 783
 784static ieee80211_tx_result debug_noinline
 785ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
 786{
 787        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 788        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 789        u16 *seq;
 790        u8 *qc;
 791        int tid;
 792
 793        /*
 794         * Packet injection may want to control the sequence
 795         * number, if we have no matching interface then we
 796         * neither assign one ourselves nor ask the driver to.
 797         */
 798        if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
 799                return TX_CONTINUE;
 800
 801        if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
 802                return TX_CONTINUE;
 803
 804        if (ieee80211_hdrlen(hdr->frame_control) < 24)
 805                return TX_CONTINUE;
 806
 807        if (ieee80211_is_qos_nullfunc(hdr->frame_control))
 808                return TX_CONTINUE;
 809
 810        /*
 811         * Anything but QoS data that has a sequence number field
 812         * (is long enough) gets a sequence number from the global
 813         * counter.
 814         */
 815        if (!ieee80211_is_data_qos(hdr->frame_control)) {
 816                /* driver should assign sequence number */
 817                info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
 818                /* for pure STA mode without beacons, we can do it */
 819                hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
 820                tx->sdata->sequence_number += 0x10;
 821                return TX_CONTINUE;
 822        }
 823
 824        /*
 825         * This should be true for injected/management frames only, for
 826         * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
 827         * above since they are not QoS-data frames.
 828         */
 829        if (!tx->sta)
 830                return TX_CONTINUE;
 831
 832        /* include per-STA, per-TID sequence counter */
 833
 834        qc = ieee80211_get_qos_ctl(hdr);
 835        tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
 836        seq = &tx->sta->tid_seq[tid];
 837
 838        hdr->seq_ctrl = cpu_to_le16(*seq);
 839
 840        /* Increase the sequence number. */
 841        *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
 842
 843        return TX_CONTINUE;
 844}
 845
 846static int ieee80211_fragment(struct ieee80211_tx_data *tx,
 847                              struct sk_buff *skb, int hdrlen,
 848                              int frag_threshold)
 849{
 850        struct ieee80211_local *local = tx->local;
 851        struct ieee80211_tx_info *info;
 852        struct sk_buff *tmp;
 853        int per_fragm = frag_threshold - hdrlen - FCS_LEN;
 854        int pos = hdrlen + per_fragm;
 855        int rem = skb->len - hdrlen - per_fragm;
 856
 857        if (WARN_ON(rem < 0))
 858                return -EINVAL;
 859
 860        /* first fragment was already added to queue by caller */
 861
 862        while (rem) {
 863                int fraglen = per_fragm;
 864
 865                if (fraglen > rem)
 866                        fraglen = rem;
 867                rem -= fraglen;
 868                tmp = dev_alloc_skb(local->tx_headroom +
 869                                    frag_threshold +
 870                                    IEEE80211_ENCRYPT_HEADROOM +
 871                                    IEEE80211_ENCRYPT_TAILROOM);
 872                if (!tmp)
 873                        return -ENOMEM;
 874
 875                __skb_queue_tail(&tx->skbs, tmp);
 876
 877                skb_reserve(tmp, local->tx_headroom +
 878                                 IEEE80211_ENCRYPT_HEADROOM);
 879                /* copy control information */
 880                memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
 881
 882                info = IEEE80211_SKB_CB(tmp);
 883                info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
 884                                 IEEE80211_TX_CTL_FIRST_FRAGMENT);
 885
 886                if (rem)
 887                        info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
 888
 889                skb_copy_queue_mapping(tmp, skb);
 890                tmp->priority = skb->priority;
 891                tmp->dev = skb->dev;
 892
 893                /* copy header and data */
 894                memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen);
 895                memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen);
 896
 897                pos += fraglen;
 898        }
 899
 900        /* adjust first fragment's length */
 901        skb->len = hdrlen + per_fragm;
 902        return 0;
 903}
 904
 905static ieee80211_tx_result debug_noinline
 906ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
 907{
 908        struct sk_buff *skb = tx->skb;
 909        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 910        struct ieee80211_hdr *hdr = (void *)skb->data;
 911        int frag_threshold = tx->local->hw.wiphy->frag_threshold;
 912        int hdrlen;
 913        int fragnum;
 914
 915        /* no matter what happens, tx->skb moves to tx->skbs */
 916        __skb_queue_tail(&tx->skbs, skb);
 917        tx->skb = NULL;
 918
 919        if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
 920                return TX_CONTINUE;
 921
 922        if (tx->local->ops->set_frag_threshold)
 923                return TX_CONTINUE;
 924
 925        /*
 926         * Warn when submitting a fragmented A-MPDU frame and drop it.
 927         * This scenario is handled in ieee80211_tx_prepare but extra
 928         * caution taken here as fragmented ampdu may cause Tx stop.
 929         */
 930        if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
 931                return TX_DROP;
 932
 933        hdrlen = ieee80211_hdrlen(hdr->frame_control);
 934
 935        /* internal error, why isn't DONTFRAG set? */
 936        if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
 937                return TX_DROP;
 938
 939        /*
 940         * Now fragment the frame. This will allocate all the fragments and
 941         * chain them (using skb as the first fragment) to skb->next.
 942         * During transmission, we will remove the successfully transmitted
 943         * fragments from this list. When the low-level driver rejects one
 944         * of the fragments then we will simply pretend to accept the skb
 945         * but store it away as pending.
 946         */
 947        if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
 948                return TX_DROP;
 949
 950        /* update duration/seq/flags of fragments */
 951        fragnum = 0;
 952
 953        skb_queue_walk(&tx->skbs, skb) {
 954                int next_len;
 955                const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
 956
 957                hdr = (void *)skb->data;
 958                info = IEEE80211_SKB_CB(skb);
 959
 960                if (!skb_queue_is_last(&tx->skbs, skb)) {
 961                        hdr->frame_control |= morefrags;
 962                        /*
 963                         * No multi-rate retries for fragmented frames, that
 964                         * would completely throw off the NAV at other STAs.
 965                         */
 966                        info->control.rates[1].idx = -1;
 967                        info->control.rates[2].idx = -1;
 968                        info->control.rates[3].idx = -1;
 969                        BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
 970                        info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
 971                } else {
 972                        hdr->frame_control &= ~morefrags;
 973                        next_len = 0;
 974                }
 975                hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
 976                fragnum++;
 977        }
 978
 979        return TX_CONTINUE;
 980}
 981
 982static ieee80211_tx_result debug_noinline
 983ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
 984{
 985        struct sk_buff *skb;
 986
 987        if (!tx->sta)
 988                return TX_CONTINUE;
 989
 990        tx->sta->tx_packets++;
 991        skb_queue_walk(&tx->skbs, skb) {
 992                tx->sta->tx_fragments++;
 993                tx->sta->tx_bytes += skb->len;
 994        }
 995
 996        return TX_CONTINUE;
 997}
 998
 999static ieee80211_tx_result debug_noinline
1000ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
1001{
1002        if (!tx->key)
1003                return TX_CONTINUE;
1004
1005        switch (tx->key->conf.cipher) {
1006        case WLAN_CIPHER_SUITE_WEP40:
1007        case WLAN_CIPHER_SUITE_WEP104:
1008                return ieee80211_crypto_wep_encrypt(tx);
1009        case WLAN_CIPHER_SUITE_TKIP:
1010                return ieee80211_crypto_tkip_encrypt(tx);
1011        case WLAN_CIPHER_SUITE_CCMP:
1012                return ieee80211_crypto_ccmp_encrypt(tx);
1013        case WLAN_CIPHER_SUITE_AES_CMAC:
1014                return ieee80211_crypto_aes_cmac_encrypt(tx);
1015        default:
1016                return ieee80211_crypto_hw_encrypt(tx);
1017        }
1018
1019        return TX_DROP;
1020}
1021
1022static ieee80211_tx_result debug_noinline
1023ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
1024{
1025        struct sk_buff *skb;
1026        struct ieee80211_hdr *hdr;
1027        int next_len;
1028        bool group_addr;
1029
1030        skb_queue_walk(&tx->skbs, skb) {
1031                hdr = (void *) skb->data;
1032                if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
1033                        break; /* must not overwrite AID */
1034                if (!skb_queue_is_last(&tx->skbs, skb)) {
1035                        struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
1036                        next_len = next->len;
1037                } else
1038                        next_len = 0;
1039                group_addr = is_multicast_ether_addr(hdr->addr1);
1040
1041                hdr->duration_id =
1042                        ieee80211_duration(tx, skb, group_addr, next_len);
1043        }
1044
1045        return TX_CONTINUE;
1046}
1047
1048/* actual transmit path */
1049
1050static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
1051                                  struct sk_buff *skb,
1052                                  struct ieee80211_tx_info *info,
1053                                  struct tid_ampdu_tx *tid_tx,
1054                                  int tid)
1055{
1056        bool queued = false;
1057        bool reset_agg_timer = false;
1058        struct sk_buff *purge_skb = NULL;
1059
1060        if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1061                info->flags |= IEEE80211_TX_CTL_AMPDU;
1062                reset_agg_timer = true;
1063        } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
1064                /*
1065                 * nothing -- this aggregation session is being started
1066                 * but that might still fail with the driver
1067                 */
1068        } else {
1069                spin_lock(&tx->sta->lock);
1070                /*
1071                 * Need to re-check now, because we may get here
1072                 *
1073                 *  1) in the window during which the setup is actually
1074                 *     already done, but not marked yet because not all
1075                 *     packets are spliced over to the driver pending
1076                 *     queue yet -- if this happened we acquire the lock
1077                 *     either before or after the splice happens, but
1078                 *     need to recheck which of these cases happened.
1079                 *
1080                 *  2) during session teardown, if the OPERATIONAL bit
1081                 *     was cleared due to the teardown but the pointer
1082                 *     hasn't been assigned NULL yet (or we loaded it
1083                 *     before it was assigned) -- in this case it may
1084                 *     now be NULL which means we should just let the
1085                 *     packet pass through because splicing the frames
1086                 *     back is already done.
1087                 */
1088                tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
1089
1090                if (!tid_tx) {
1091                        /* do nothing, let packet pass through */
1092                } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
1093                        info->flags |= IEEE80211_TX_CTL_AMPDU;
1094                        reset_agg_timer = true;
1095                } else {
1096                        queued = true;
1097                        info->control.vif = &tx->sdata->vif;
1098                        info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1099                        __skb_queue_tail(&tid_tx->pending, skb);
1100                        if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
1101                                purge_skb = __skb_dequeue(&tid_tx->pending);
1102                }
1103                spin_unlock(&tx->sta->lock);
1104
1105                if (purge_skb)
1106                        ieee80211_free_txskb(&tx->local->hw, purge_skb);
1107        }
1108
1109        /* reset session timer */
1110        if (reset_agg_timer && tid_tx->timeout)
1111                tid_tx->last_tx = jiffies;
1112
1113        return queued;
1114}
1115
1116/*
1117 * initialises @tx
1118 */
1119static ieee80211_tx_result
1120ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
1121                     struct ieee80211_tx_data *tx,
1122                     struct sk_buff *skb)
1123{
1124        struct ieee80211_local *local = sdata->local;
1125        struct ieee80211_hdr *hdr;
1126        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1127        int tid;
1128        u8 *qc;
1129
1130        memset(tx, 0, sizeof(*tx));
1131        tx->skb = skb;
1132        tx->local = local;
1133        tx->sdata = sdata;
1134        tx->channel = local->hw.conf.channel;
1135        __skb_queue_head_init(&tx->skbs);
1136
1137        /*
1138         * If this flag is set to true anywhere, and we get here,
1139         * we are doing the needed processing, so remove the flag
1140         * now.
1141         */
1142        info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;
1143
1144        hdr = (struct ieee80211_hdr *) skb->data;
1145
1146        if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1147                tx->sta = rcu_dereference(sdata->u.vlan.sta);
1148                if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
1149                        return TX_DROP;
1150        } else if (info->flags & IEEE80211_TX_CTL_INJECTED ||
1151                   tx->sdata->control_port_protocol == tx->skb->protocol) {
1152                tx->sta = sta_info_get_bss(sdata, hdr->addr1);
1153        }
1154        if (!tx->sta)
1155                tx->sta = sta_info_get(sdata, hdr->addr1);
1156
1157        if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
1158            !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
1159            (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
1160            !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
1161                struct tid_ampdu_tx *tid_tx;
1162
1163                qc = ieee80211_get_qos_ctl(hdr);
1164                tid = *qc & IEEE80211_QOS_CTL_TID_MASK;
1165
1166                tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
1167                if (tid_tx) {
1168                        bool queued;
1169
1170                        queued = ieee80211_tx_prep_agg(tx, skb, info,
1171                                                       tid_tx, tid);
1172
1173                        if (unlikely(queued))
1174                                return TX_QUEUED;
1175                }
1176        }
1177
1178        if (is_multicast_ether_addr(hdr->addr1)) {
1179                tx->flags &= ~IEEE80211_TX_UNICAST;
1180                info->flags |= IEEE80211_TX_CTL_NO_ACK;
1181        } else
1182                tx->flags |= IEEE80211_TX_UNICAST;
1183
1184        if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
1185                if (!(tx->flags & IEEE80211_TX_UNICAST) ||
1186                    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
1187                    info->flags & IEEE80211_TX_CTL_AMPDU)
1188                        info->flags |= IEEE80211_TX_CTL_DONTFRAG;
1189        }
1190
1191        if (!tx->sta)
1192                info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1193        else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
1194                info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
1195
1196        info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
1197
1198        return TX_CONTINUE;
1199}
1200
1201static bool ieee80211_tx_frags(struct ieee80211_local *local,
1202                               struct ieee80211_vif *vif,
1203                               struct ieee80211_sta *sta,
1204                               struct sk_buff_head *skbs,
1205                               bool txpending)
1206{
1207        struct sk_buff *skb, *tmp;
1208        unsigned long flags;
1209
1210        skb_queue_walk_safe(skbs, skb, tmp) {
1211                struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1212                int q = info->hw_queue;
1213
1214#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1215                if (WARN_ON_ONCE(q >= local->hw.queues)) {
1216                        __skb_unlink(skb, skbs);
1217                        ieee80211_free_txskb(&local->hw, skb);
1218                        continue;
1219                }
1220#endif
1221
1222                spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1223                if (local->queue_stop_reasons[q] ||
1224                    (!txpending && !skb_queue_empty(&local->pending[q]))) {
1225                        /*
1226                         * Since queue is stopped, queue up frames for later
1227                         * transmission from the tx-pending tasklet when the
1228                         * queue is woken again.
1229                         */
1230                        if (txpending)
1231                                skb_queue_splice_init(skbs, &local->pending[q]);
1232                        else
1233                                skb_queue_splice_tail_init(skbs,
1234                                                           &local->pending[q]);
1235
1236                        spin_unlock_irqrestore(&local->queue_stop_reason_lock,
1237                                               flags);
1238                        return false;
1239                }
1240                spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1241
1242                info->control.vif = vif;
1243                info->control.sta = sta;
1244
1245                __skb_unlink(skb, skbs);
1246                drv_tx(local, skb);
1247        }
1248
1249        return true;
1250}
1251
1252/*
1253 * Returns false if the frame couldn't be transmitted but was queued instead.
1254 */
1255static bool __ieee80211_tx(struct ieee80211_local *local,
1256                           struct sk_buff_head *skbs, int led_len,
1257                           struct sta_info *sta, bool txpending)
1258{
1259        struct ieee80211_tx_info *info;
1260        struct ieee80211_sub_if_data *sdata;
1261        struct ieee80211_vif *vif;
1262        struct ieee80211_sta *pubsta;
1263        struct sk_buff *skb;
1264        bool result = true;
1265        __le16 fc;
1266
1267        if (WARN_ON(skb_queue_empty(skbs)))
1268                return true;
1269
1270        skb = skb_peek(skbs);
1271        fc = ((struct ieee80211_hdr *)skb->data)->frame_control;
1272        info = IEEE80211_SKB_CB(skb);
1273        sdata = vif_to_sdata(info->control.vif);
1274        if (sta && !sta->uploaded)
1275                sta = NULL;
1276
1277        if (sta)
1278                pubsta = &sta->sta;
1279        else
1280                pubsta = NULL;
1281
1282        switch (sdata->vif.type) {
1283        case NL80211_IFTYPE_MONITOR:
1284                sdata = rcu_dereference(local->monitor_sdata);
1285                if (sdata) {
1286                        vif = &sdata->vif;
1287                        info->hw_queue =
1288                                vif->hw_queue[skb_get_queue_mapping(skb)];
1289                } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
1290                        dev_kfree_skb(skb);
1291                        return true;
1292                } else
1293                        vif = NULL;
1294                break;
1295        case NL80211_IFTYPE_AP_VLAN:
1296                sdata = container_of(sdata->bss,
1297                                     struct ieee80211_sub_if_data, u.ap);
1298                /* fall through */
1299        default:
1300                vif = &sdata->vif;
1301                break;
1302        }
1303
1304        result = ieee80211_tx_frags(local, vif, pubsta, skbs,
1305                                    txpending);
1306
1307        ieee80211_tpt_led_trig_tx(local, fc, led_len);
1308        ieee80211_led_tx(local, 1);
1309
1310        WARN_ON_ONCE(!skb_queue_empty(skbs));
1311
1312        return result;
1313}
1314
1315/*
1316 * Invoke TX handlers, return 0 on success and non-zero if the
1317 * frame was dropped or queued.
1318 */
1319static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
1320{
1321        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
1322        ieee80211_tx_result res = TX_DROP;
1323
1324#define CALL_TXH(txh) \
1325        do {                            \
1326                res = txh(tx);          \
1327                if (res != TX_CONTINUE) \
1328                        goto txh_done;  \
1329        } while (0)
1330
1331        CALL_TXH(ieee80211_tx_h_dynamic_ps);
1332        CALL_TXH(ieee80211_tx_h_check_assoc);
1333        CALL_TXH(ieee80211_tx_h_ps_buf);
1334        CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
1335        CALL_TXH(ieee80211_tx_h_select_key);
1336        if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1337                CALL_TXH(ieee80211_tx_h_rate_ctrl);
1338
1339        if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
1340                __skb_queue_tail(&tx->skbs, tx->skb);
1341                tx->skb = NULL;
1342                goto txh_done;
1343        }
1344
1345        CALL_TXH(ieee80211_tx_h_michael_mic_add);
1346        CALL_TXH(ieee80211_tx_h_sequence);
1347        CALL_TXH(ieee80211_tx_h_fragment);
1348        /* handlers after fragment must be aware of tx info fragmentation! */
1349        CALL_TXH(ieee80211_tx_h_stats);
1350        CALL_TXH(ieee80211_tx_h_encrypt);
1351        if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL))
1352                CALL_TXH(ieee80211_tx_h_calculate_duration);
1353#undef CALL_TXH
1354
1355 txh_done:
1356        if (unlikely(res == TX_DROP)) {
1357                I802_DEBUG_INC(tx->local->tx_handlers_drop);
1358                if (tx->skb)
1359                        ieee80211_free_txskb(&tx->local->hw, tx->skb);
1360                else
1361                        ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
1362                return -1;
1363        } else if (unlikely(res == TX_QUEUED)) {
1364                I802_DEBUG_INC(tx->local->tx_handlers_queued);
1365                return -1;
1366        }
1367
1368        return 0;
1369}
1370
1371/*
1372 * Returns false if the frame couldn't be transmitted but was queued instead.
1373 */
1374static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
1375                         struct sk_buff *skb, bool txpending)
1376{
1377        struct ieee80211_local *local = sdata->local;
1378        struct ieee80211_tx_data tx;
1379        ieee80211_tx_result res_prepare;
1380        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1381        bool result = true;
1382        int led_len;
1383
1384        if (unlikely(skb->len < 10)) {
1385                dev_kfree_skb(skb);
1386                return true;
1387        }
1388
1389        rcu_read_lock();
1390
1391        /* initialises tx */
1392        led_len = skb->len;
1393        res_prepare = ieee80211_tx_prepare(sdata, &tx, skb);
1394
1395        if (unlikely(res_prepare == TX_DROP)) {
1396                ieee80211_free_txskb(&local->hw, skb);
1397                goto out;
1398        } else if (unlikely(res_prepare == TX_QUEUED)) {
1399                goto out;
1400        }
1401
1402        tx.channel = local->hw.conf.channel;
1403        info->band = tx.channel->band;
1404
1405        /* set up hw_queue value early */
1406        if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
1407            !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
1408                info->hw_queue =
1409                        sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
1410
1411        if (!invoke_tx_handlers(&tx))
1412                result = __ieee80211_tx(local, &tx.skbs, led_len,
1413                                        tx.sta, txpending);
1414 out:
1415        rcu_read_unlock();
1416        return result;
1417}
1418
1419/* device xmit handlers */
1420
1421static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
1422                                struct sk_buff *skb,
1423                                int head_need, bool may_encrypt)
1424{
1425        struct ieee80211_local *local = sdata->local;
1426        int tail_need = 0;
1427
1428        if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) {
1429                tail_need = IEEE80211_ENCRYPT_TAILROOM;
1430                tail_need -= skb_tailroom(skb);
1431                tail_need = max_t(int, tail_need, 0);
1432        }
1433
1434        if (skb_cloned(skb))
1435                I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
1436        else if (head_need || tail_need)
1437                I802_DEBUG_INC(local->tx_expand_skb_head);
1438        else
1439                return 0;
1440
1441        if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
1442                wiphy_debug(local->hw.wiphy,
1443                            "failed to reallocate TX buffer\n");
1444                return -ENOMEM;
1445        }
1446
1447        return 0;
1448}
1449
1450void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
1451{
1452        struct ieee80211_local *local = sdata->local;
1453        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1454        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1455        int headroom;
1456        bool may_encrypt;
1457
1458        rcu_read_lock();
1459
1460        may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT);
1461
1462        headroom = local->tx_headroom;
1463        if (may_encrypt)
1464                headroom += IEEE80211_ENCRYPT_HEADROOM;
1465        headroom -= skb_headroom(skb);
1466        headroom = max_t(int, 0, headroom);
1467
1468        if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) {
1469                ieee80211_free_txskb(&local->hw, skb);
1470                rcu_read_unlock();
1471                return;
1472        }
1473
1474        hdr = (struct ieee80211_hdr *) skb->data;
1475        info->control.vif = &sdata->vif;
1476
1477        if (ieee80211_vif_is_mesh(&sdata->vif) &&
1478            ieee80211_is_data(hdr->frame_control) &&
1479            !is_multicast_ether_addr(hdr->addr1) &&
1480            mesh_nexthop_resolve(skb, sdata)) {
1481                /* skb queued: don't free */
1482                rcu_read_unlock();
1483                return;
1484        }
1485
1486        ieee80211_set_qos_hdr(sdata, skb);
1487        ieee80211_tx(sdata, skb, false);
1488        rcu_read_unlock();
1489}
1490
1491static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb)
1492{
1493        struct ieee80211_radiotap_iterator iterator;
1494        struct ieee80211_radiotap_header *rthdr =
1495                (struct ieee80211_radiotap_header *) skb->data;
1496        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1497        int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
1498                                                   NULL);
1499        u16 txflags;
1500
1501        info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1502                       IEEE80211_TX_CTL_DONTFRAG;
1503
1504        /*
1505         * for every radiotap entry that is present
1506         * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
1507         * entries present, or -EINVAL on error)
1508         */
1509
1510        while (!ret) {
1511                ret = ieee80211_radiotap_iterator_next(&iterator);
1512
1513                if (ret)
1514                        continue;
1515
1516                /* see if this argument is something we can use */
1517                switch (iterator.this_arg_index) {
1518                /*
1519                 * You must take care when dereferencing iterator.this_arg
1520                 * for multibyte types... the pointer is not aligned.  Use
1521                 * get_unaligned((type *)iterator.this_arg) to dereference
1522                 * iterator.this_arg for type "type" safely on all arches.
1523                */
1524                case IEEE80211_RADIOTAP_FLAGS:
1525                        if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
1526                                /*
1527                                 * this indicates that the skb we have been
1528                                 * handed has the 32-bit FCS CRC at the end...
1529                                 * we should react to that by snipping it off
1530                                 * because it will be recomputed and added
1531                                 * on transmission
1532                                 */
1533                                if (skb->len < (iterator._max_length + FCS_LEN))
1534                                        return false;
1535
1536                                skb_trim(skb, skb->len - FCS_LEN);
1537                        }
1538                        if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
1539                                info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
1540                        if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
1541                                info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
1542                        break;
1543
1544                case IEEE80211_RADIOTAP_TX_FLAGS:
1545                        txflags = get_unaligned_le16(iterator.this_arg);
1546                        if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
1547                                info->flags |= IEEE80211_TX_CTL_NO_ACK;
1548                        break;
1549
1550                /*
1551                 * Please update the file
1552                 * Documentation/networking/mac80211-injection.txt
1553                 * when parsing new fields here.
1554                 */
1555
1556                default:
1557                        break;
1558                }
1559        }
1560
1561        if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
1562                return false;
1563
1564        /*
1565         * remove the radiotap header
1566         * iterator->_max_length was sanity-checked against
1567         * skb->len by iterator init
1568         */
1569        skb_pull(skb, iterator._max_length);
1570
1571        return true;
1572}
1573
1574netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
1575                                         struct net_device *dev)
1576{
1577        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1578        struct ieee80211_channel *chan = local->hw.conf.channel;
1579        struct ieee80211_radiotap_header *prthdr =
1580                (struct ieee80211_radiotap_header *)skb->data;
1581        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1582        struct ieee80211_hdr *hdr;
1583        struct ieee80211_sub_if_data *tmp_sdata, *sdata;
1584        u16 len_rthdr;
1585        int hdrlen;
1586
1587        /*
1588         * Frame injection is not allowed if beaconing is not allowed
1589         * or if we need radar detection. Beaconing is usually not allowed when
1590         * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
1591         * Passive scan is also used in world regulatory domains where
1592         * your country is not known and as such it should be treated as
1593         * NO TX unless the channel is explicitly allowed in which case
1594         * your current regulatory domain would not have the passive scan
1595         * flag.
1596         *
1597         * Since AP mode uses monitor interfaces to inject/TX management
1598         * frames we can make AP mode the exception to this rule once it
1599         * supports radar detection as its implementation can deal with
1600         * radar detection by itself. We can do that later by adding a
1601         * monitor flag interfaces used for AP support.
1602         */
1603        if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR |
1604             IEEE80211_CHAN_PASSIVE_SCAN)))
1605                goto fail;
1606
1607        /* check for not even having the fixed radiotap header part */
1608        if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
1609                goto fail; /* too short to be possibly valid */
1610
1611        /* is it a header version we can trust to find length from? */
1612        if (unlikely(prthdr->it_version))
1613                goto fail; /* only version 0 is supported */
1614
1615        /* then there must be a radiotap header with a length we can use */
1616        len_rthdr = ieee80211_get_radiotap_len(skb->data);
1617
1618        /* does the skb contain enough to deliver on the alleged length? */
1619        if (unlikely(skb->len < len_rthdr))
1620                goto fail; /* skb too short for claimed rt header extent */
1621
1622        /*
1623         * fix up the pointers accounting for the radiotap
1624         * header still being in there.  We are being given
1625         * a precooked IEEE80211 header so no need for
1626         * normal processing
1627         */
1628        skb_set_mac_header(skb, len_rthdr);
1629        /*
1630         * these are just fixed to the end of the rt area since we
1631         * don't have any better information and at this point, nobody cares
1632         */
1633        skb_set_network_header(skb, len_rthdr);
1634        skb_set_transport_header(skb, len_rthdr);
1635
1636        if (skb->len < len_rthdr + 2)
1637                goto fail;
1638
1639        hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1640        hdrlen = ieee80211_hdrlen(hdr->frame_control);
1641
1642        if (skb->len < len_rthdr + hdrlen)
1643                goto fail;
1644
1645        /*
1646         * Initialize skb->protocol if the injected frame is a data frame
1647         * carrying a rfc1042 header
1648         */
1649        if (ieee80211_is_data(hdr->frame_control) &&
1650            skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
1651                u8 *payload = (u8 *)hdr + hdrlen;
1652
1653                if (ether_addr_equal(payload, rfc1042_header))
1654                        skb->protocol = cpu_to_be16((payload[6] << 8) |
1655                                                    payload[7]);
1656        }
1657
1658        memset(info, 0, sizeof(*info));
1659
1660        info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
1661                      IEEE80211_TX_CTL_INJECTED;
1662
1663        /* process and remove the injection radiotap header */
1664        if (!ieee80211_parse_tx_radiotap(skb))
1665                goto fail;
1666
1667        rcu_read_lock();
1668
1669        /*
1670         * We process outgoing injected frames that have a local address
1671         * we handle as though they are non-injected frames.
1672         * This code here isn't entirely correct, the local MAC address
1673         * isn't always enough to find the interface to use; for proper
1674         * VLAN/WDS support we will need a different mechanism (which
1675         * likely isn't going to be monitor interfaces).
1676         */
1677        sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1678
1679        list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
1680                if (!ieee80211_sdata_running(tmp_sdata))
1681                        continue;
1682                if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1683                    tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1684                    tmp_sdata->vif.type == NL80211_IFTYPE_WDS)
1685                        continue;
1686                if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
1687                        sdata = tmp_sdata;
1688                        break;
1689                }
1690        }
1691
1692        ieee80211_xmit(sdata, skb);
1693        rcu_read_unlock();
1694
1695        return NETDEV_TX_OK;
1696
1697fail:
1698        dev_kfree_skb(skb);
1699        return NETDEV_TX_OK; /* meaning, we dealt with the skb */
1700}
1701
1702/**
1703 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
1704 * subinterfaces (wlan#, WDS, and VLAN interfaces)
1705 * @skb: packet to be sent
1706 * @dev: incoming interface
1707 *
1708 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
1709 * not be freed, and caller is responsible for either retrying later or freeing
1710 * skb).
1711 *
1712 * This function takes in an Ethernet header and encapsulates it with suitable
1713 * IEEE 802.11 header based on which interface the packet is coming in. The
1714 * encapsulated packet will then be passed to master interface, wlan#.11, for
1715 * transmission (through low-level driver).
1716 */
1717netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
1718                                    struct net_device *dev)
1719{
1720        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1721        struct ieee80211_local *local = sdata->local;
1722        struct ieee80211_tx_info *info;
1723        int ret = NETDEV_TX_BUSY, head_need;
1724        u16 ethertype, hdrlen,  meshhdrlen = 0;
1725        __le16 fc;
1726        struct ieee80211_hdr hdr;
1727        struct ieee80211s_hdr mesh_hdr __maybe_unused;
1728        struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
1729        const u8 *encaps_data;
1730        int encaps_len, skip_header_bytes;
1731        int nh_pos, h_pos;
1732        struct sta_info *sta = NULL;
1733        bool wme_sta = false, authorized = false, tdls_auth = false;
1734        bool tdls_direct = false;
1735        bool multicast;
1736        u32 info_flags = 0;
1737        u16 info_id = 0;
1738
1739        if (unlikely(skb->len < ETH_HLEN)) {
1740                ret = NETDEV_TX_OK;
1741                goto fail;
1742        }
1743
1744        /* convert Ethernet header to proper 802.11 header (based on
1745         * operation mode) */
1746        ethertype = (skb->data[12] << 8) | skb->data[13];
1747        fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
1748
1749        switch (sdata->vif.type) {
1750        case NL80211_IFTYPE_AP_VLAN:
1751                rcu_read_lock();
1752                sta = rcu_dereference(sdata->u.vlan.sta);
1753                if (sta) {
1754                        fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1755                        /* RA TA DA SA */
1756                        memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
1757                        memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1758                        memcpy(hdr.addr3, skb->data, ETH_ALEN);
1759                        memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1760                        hdrlen = 30;
1761                        authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1762                        wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1763                }
1764                rcu_read_unlock();
1765                if (sta)
1766                        break;
1767                /* fall through */
1768        case NL80211_IFTYPE_AP:
1769                fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
1770                /* DA BSSID SA */
1771                memcpy(hdr.addr1, skb->data, ETH_ALEN);
1772                memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1773                memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
1774                hdrlen = 24;
1775                break;
1776        case NL80211_IFTYPE_WDS:
1777                fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
1778                /* RA TA DA SA */
1779                memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN);
1780                memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1781                memcpy(hdr.addr3, skb->data, ETH_ALEN);
1782                memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1783                hdrlen = 30;
1784                break;
1785#ifdef CONFIG_MAC80211_MESH
1786        case NL80211_IFTYPE_MESH_POINT:
1787                if (!sdata->u.mesh.mshcfg.dot11MeshTTL) {
1788                        /* Do not send frames with mesh_ttl == 0 */
1789                        sdata->u.mesh.mshstats.dropped_frames_ttl++;
1790                        ret = NETDEV_TX_OK;
1791                        goto fail;
1792                }
1793                rcu_read_lock();
1794                if (!is_multicast_ether_addr(skb->data)) {
1795                        mpath = mesh_path_lookup(skb->data, sdata);
1796                        if (!mpath)
1797                                mppath = mpp_path_lookup(skb->data, sdata);
1798                }
1799
1800                /*
1801                 * Use address extension if it is a packet from
1802                 * another interface or if we know the destination
1803                 * is being proxied by a portal (i.e. portal address
1804                 * differs from proxied address)
1805                 */
1806                if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
1807                    !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
1808                        hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1809                                        skb->data, skb->data + ETH_ALEN);
1810                        rcu_read_unlock();
1811                        meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr,
1812                                        sdata, NULL, NULL);
1813                } else {
1814                        /* DS -> MBSS (802.11-2012 13.11.3.3).
1815                         * For unicast with unknown forwarding information,
1816                         * destination might be in the MBSS or if that fails
1817                         * forwarded to another mesh gate. In either case
1818                         * resolution will be handled in ieee80211_xmit(), so
1819                         * leave the original DA. This also works for mcast */
1820                        const u8 *mesh_da = skb->data;
1821
1822                        if (mppath)
1823                                mesh_da = mppath->mpp;
1824                        else if (mpath)
1825                                mesh_da = mpath->dst;
1826                        rcu_read_unlock();
1827
1828                        hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
1829                                        mesh_da, sdata->vif.addr);
1830                        if (is_multicast_ether_addr(mesh_da))
1831                                /* DA TA mSA AE:SA */
1832                                meshhdrlen =
1833                                        ieee80211_new_mesh_header(&mesh_hdr,
1834                                                        sdata,
1835                                                        skb->data + ETH_ALEN,
1836                                                        NULL);
1837                        else
1838                                /* RA TA mDA mSA AE:DA SA */
1839                                meshhdrlen =
1840                                        ieee80211_new_mesh_header(&mesh_hdr,
1841                                                        sdata,
1842                                                        skb->data,
1843                                                        skb->data + ETH_ALEN);
1844
1845                }
1846                break;
1847#endif
1848        case NL80211_IFTYPE_STATION:
1849                if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
1850                        bool tdls_peer = false;
1851
1852                        rcu_read_lock();
1853                        sta = sta_info_get(sdata, skb->data);
1854                        if (sta) {
1855                                authorized = test_sta_flag(sta,
1856                                                        WLAN_STA_AUTHORIZED);
1857                                wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1858                                tdls_peer = test_sta_flag(sta,
1859                                                         WLAN_STA_TDLS_PEER);
1860                                tdls_auth = test_sta_flag(sta,
1861                                                WLAN_STA_TDLS_PEER_AUTH);
1862                        }
1863                        rcu_read_unlock();
1864
1865                        /*
1866                         * If the TDLS link is enabled, send everything
1867                         * directly. Otherwise, allow TDLS setup frames
1868                         * to be transmitted indirectly.
1869                         */
1870                        tdls_direct = tdls_peer && (tdls_auth ||
1871                                 !(ethertype == ETH_P_TDLS && skb->len > 14 &&
1872                                   skb->data[14] == WLAN_TDLS_SNAP_RFTYPE));
1873                }
1874
1875                if (tdls_direct) {
1876                        /* link during setup - throw out frames to peer */
1877                        if (!tdls_auth) {
1878                                ret = NETDEV_TX_OK;
1879                                goto fail;
1880                        }
1881
1882                        /* DA SA BSSID */
1883                        memcpy(hdr.addr1, skb->data, ETH_ALEN);
1884                        memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1885                        memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
1886                        hdrlen = 24;
1887                }  else if (sdata->u.mgd.use_4addr &&
1888                            cpu_to_be16(ethertype) != sdata->control_port_protocol) {
1889                        fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
1890                                          IEEE80211_FCTL_TODS);
1891                        /* RA TA DA SA */
1892                        memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1893                        memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
1894                        memcpy(hdr.addr3, skb->data, ETH_ALEN);
1895                        memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
1896                        hdrlen = 30;
1897                } else {
1898                        fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
1899                        /* BSSID SA DA */
1900                        memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN);
1901                        memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1902                        memcpy(hdr.addr3, skb->data, ETH_ALEN);
1903                        hdrlen = 24;
1904                }
1905                break;
1906        case NL80211_IFTYPE_ADHOC:
1907                /* DA SA BSSID */
1908                memcpy(hdr.addr1, skb->data, ETH_ALEN);
1909                memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
1910                memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
1911                hdrlen = 24;
1912                break;
1913        default:
1914                ret = NETDEV_TX_OK;
1915                goto fail;
1916        }
1917
1918        /*
1919         * There's no need to try to look up the destination
1920         * if it is a multicast address (which can only happen
1921         * in AP mode)
1922         */
1923        multicast = is_multicast_ether_addr(hdr.addr1);
1924        if (!multicast) {
1925                rcu_read_lock();
1926                sta = sta_info_get(sdata, hdr.addr1);
1927                if (sta) {
1928                        authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1929                        wme_sta = test_sta_flag(sta, WLAN_STA_WME);
1930                }
1931                rcu_read_unlock();
1932        }
1933
1934        /* For mesh, the use of the QoS header is mandatory */
1935        if (ieee80211_vif_is_mesh(&sdata->vif))
1936                wme_sta = true;
1937
1938        /* receiver and we are QoS enabled, use a QoS type frame */
1939        if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) {
1940                fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1941                hdrlen += 2;
1942        }
1943
1944        /*
1945         * Drop unicast frames to unauthorised stations unless they are
1946         * EAPOL frames from the local station.
1947         */
1948        if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
1949                     !is_multicast_ether_addr(hdr.addr1) && !authorized &&
1950                     (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
1951                      !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) {
1952#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1953                net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
1954                                    dev->name, hdr.addr1);
1955#endif
1956
1957                I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
1958
1959                ret = NETDEV_TX_OK;
1960                goto fail;
1961        }
1962
1963        if (unlikely(!multicast && skb->sk &&
1964                     skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) {
1965                struct sk_buff *orig_skb = skb;
1966
1967                skb = skb_clone(skb, GFP_ATOMIC);
1968                if (skb) {
1969                        unsigned long flags;
1970                        int id, r;
1971
1972                        spin_lock_irqsave(&local->ack_status_lock, flags);
1973                        r = idr_get_new_above(&local->ack_status_frames,
1974                                              orig_skb, 1, &id);
1975                        if (r == -EAGAIN) {
1976                                idr_pre_get(&local->ack_status_frames,
1977                                            GFP_ATOMIC);
1978                                r = idr_get_new_above(&local->ack_status_frames,
1979                                                      orig_skb, 1, &id);
1980                        }
1981                        if (WARN_ON(!id) || id > 0xffff) {
1982                                idr_remove(&local->ack_status_frames, id);
1983                                r = -ERANGE;
1984                        }
1985                        spin_unlock_irqrestore(&local->ack_status_lock, flags);
1986
1987                        if (!r) {
1988                                info_id = id;
1989                                info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
1990                        } else if (skb_shared(skb)) {
1991                                kfree_skb(orig_skb);
1992                        } else {
1993                                kfree_skb(skb);
1994                                skb = orig_skb;
1995                        }
1996                } else {
1997                        /* couldn't clone -- lose tx status ... */
1998                        skb = orig_skb;
1999                }
2000        }
2001
2002        /*
2003         * If the skb is shared we need to obtain our own copy.
2004         */
2005        if (skb_shared(skb)) {
2006                struct sk_buff *tmp_skb = skb;
2007
2008                /* can't happen -- skb is a clone if info_id != 0 */
2009                WARN_ON(info_id);
2010
2011                skb = skb_clone(skb, GFP_ATOMIC);
2012                kfree_skb(tmp_skb);
2013
2014                if (!skb) {
2015                        ret = NETDEV_TX_OK;
2016                        goto fail;
2017                }
2018        }
2019
2020        hdr.frame_control = fc;
2021        hdr.duration_id = 0;
2022        hdr.seq_ctrl = 0;
2023
2024        skip_header_bytes = ETH_HLEN;
2025        if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
2026                encaps_data = bridge_tunnel_header;
2027                encaps_len = sizeof(bridge_tunnel_header);
2028                skip_header_bytes -= 2;
2029        } else if (ethertype >= 0x600) {
2030                encaps_data = rfc1042_header;
2031                encaps_len = sizeof(rfc1042_header);
2032                skip_header_bytes -= 2;
2033        } else {
2034                encaps_data = NULL;
2035                encaps_len = 0;
2036        }
2037
2038        nh_pos = skb_network_header(skb) - skb->data;
2039        h_pos = skb_transport_header(skb) - skb->data;
2040
2041        skb_pull(skb, skip_header_bytes);
2042        nh_pos -= skip_header_bytes;
2043        h_pos -= skip_header_bytes;
2044
2045        head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
2046
2047        /*
2048         * So we need to modify the skb header and hence need a copy of
2049         * that. The head_need variable above doesn't, so far, include
2050         * the needed header space that we don't need right away. If we
2051         * can, then we don't reallocate right now but only after the
2052         * frame arrives at the master device (if it does...)
2053         *
2054         * If we cannot, however, then we will reallocate to include all
2055         * the ever needed space. Also, if we need to reallocate it anyway,
2056         * make it big enough for everything we may ever need.
2057         */
2058
2059        if (head_need > 0 || skb_cloned(skb)) {
2060                head_need += IEEE80211_ENCRYPT_HEADROOM;
2061                head_need += local->tx_headroom;
2062                head_need = max_t(int, 0, head_need);
2063                if (ieee80211_skb_resize(sdata, skb, head_need, true)) {
2064                        ieee80211_free_txskb(&local->hw, skb);
2065                        return NETDEV_TX_OK;
2066                }
2067        }
2068
2069        if (encaps_data) {
2070                memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
2071                nh_pos += encaps_len;
2072                h_pos += encaps_len;
2073        }
2074
2075#ifdef CONFIG_MAC80211_MESH
2076        if (meshhdrlen > 0) {
2077                memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
2078                nh_pos += meshhdrlen;
2079                h_pos += meshhdrlen;
2080        }
2081#endif
2082
2083        if (ieee80211_is_data_qos(fc)) {
2084                __le16 *qos_control;
2085
2086                qos_control = (__le16*) skb_push(skb, 2);
2087                memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
2088                /*
2089                 * Maybe we could actually set some fields here, for now just
2090                 * initialise to zero to indicate no special operation.
2091                 */
2092                *qos_control = 0;
2093        } else
2094                memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
2095
2096        nh_pos += hdrlen;
2097        h_pos += hdrlen;
2098
2099        dev->stats.tx_packets++;
2100        dev->stats.tx_bytes += skb->len;
2101
2102        /* Update skb pointers to various headers since this modified frame
2103         * is going to go through Linux networking code that may potentially
2104         * need things like pointer to IP header. */
2105        skb_set_mac_header(skb, 0);
2106        skb_set_network_header(skb, nh_pos);
2107        skb_set_transport_header(skb, h_pos);
2108
2109        info = IEEE80211_SKB_CB(skb);
2110        memset(info, 0, sizeof(*info));
2111
2112        dev->trans_start = jiffies;
2113
2114        info->flags = info_flags;
2115        info->ack_frame_id = info_id;
2116
2117        ieee80211_xmit(sdata, skb);
2118
2119        return NETDEV_TX_OK;
2120
2121 fail:
2122        if (ret == NETDEV_TX_OK)
2123                dev_kfree_skb(skb);
2124
2125        return ret;
2126}
2127
2128
2129/*
2130 * ieee80211_clear_tx_pending may not be called in a context where
2131 * it is possible that it packets could come in again.
2132 */
2133void ieee80211_clear_tx_pending(struct ieee80211_local *local)
2134{
2135        struct sk_buff *skb;
2136        int i;
2137
2138        for (i = 0; i < local->hw.queues; i++) {
2139                while ((skb = skb_dequeue(&local->pending[i])) != NULL)
2140                        ieee80211_free_txskb(&local->hw, skb);
2141        }
2142}
2143
2144/*
2145 * Returns false if the frame couldn't be transmitted but was queued instead,
2146 * which in this case means re-queued -- take as an indication to stop sending
2147 * more pending frames.
2148 */
2149static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
2150                                     struct sk_buff *skb)
2151{
2152        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2153        struct ieee80211_sub_if_data *sdata;
2154        struct sta_info *sta;
2155        struct ieee80211_hdr *hdr;
2156        bool result;
2157
2158        sdata = vif_to_sdata(info->control.vif);
2159
2160        if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) {
2161                result = ieee80211_tx(sdata, skb, true);
2162        } else {
2163                struct sk_buff_head skbs;
2164
2165                __skb_queue_head_init(&skbs);
2166                __skb_queue_tail(&skbs, skb);
2167
2168                hdr = (struct ieee80211_hdr *)skb->data;
2169                sta = sta_info_get(sdata, hdr->addr1);
2170
2171                result = __ieee80211_tx(local, &skbs, skb->len, sta, true);
2172        }
2173
2174        return result;
2175}
2176
2177/*
2178 * Transmit all pending packets. Called from tasklet.
2179 */
2180void ieee80211_tx_pending(unsigned long data)
2181{
2182        struct ieee80211_local *local = (struct ieee80211_local *)data;
2183        unsigned long flags;
2184        int i;
2185        bool txok;
2186
2187        rcu_read_lock();
2188
2189        spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
2190        for (i = 0; i < local->hw.queues; i++) {
2191                /*
2192                 * If queue is stopped by something other than due to pending
2193                 * frames, or we have no pending frames, proceed to next queue.
2194                 */
2195                if (local->queue_stop_reasons[i] ||
2196                    skb_queue_empty(&local->pending[i]))
2197                        continue;
2198
2199                while (!skb_queue_empty(&local->pending[i])) {
2200                        struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
2201                        struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2202
2203                        if (WARN_ON(!info->control.vif)) {
2204                                ieee80211_free_txskb(&local->hw, skb);
2205                                continue;
2206                        }
2207
2208                        spin_unlock_irqrestore(&local->queue_stop_reason_lock,
2209                                                flags);
2210
2211                        txok = ieee80211_tx_pending_skb(local, skb);
2212                        spin_lock_irqsave(&local->queue_stop_reason_lock,
2213                                          flags);
2214                        if (!txok)
2215                                break;
2216                }
2217
2218                if (skb_queue_empty(&local->pending[i]))
2219                        ieee80211_propagate_queue_wake(local, i);
2220        }
2221        spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
2222
2223        rcu_read_unlock();
2224}
2225
2226/* functions for drivers to get certain frames */
2227
2228static void ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
2229                                     struct ieee80211_if_ap *bss,
2230                                     struct sk_buff *skb,
2231                                     struct beacon_data *beacon)
2232{
2233        u8 *pos, *tim;
2234        int aid0 = 0;
2235        int i, have_bits = 0, n1, n2;
2236
2237        /* Generate bitmap for TIM only if there are any STAs in power save
2238         * mode. */
2239        if (atomic_read(&bss->num_sta_ps) > 0)
2240                /* in the hope that this is faster than
2241                 * checking byte-for-byte */
2242                have_bits = !bitmap_empty((unsigned long*)bss->tim,
2243                                          IEEE80211_MAX_AID+1);
2244
2245        if (bss->dtim_count == 0)
2246                bss->dtim_count = sdata->vif.bss_conf.dtim_period - 1;
2247        else
2248                bss->dtim_count--;
2249
2250        tim = pos = (u8 *) skb_put(skb, 6);
2251        *pos++ = WLAN_EID_TIM;
2252        *pos++ = 4;
2253        *pos++ = bss->dtim_count;
2254        *pos++ = sdata->vif.bss_conf.dtim_period;
2255
2256        if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf))
2257                aid0 = 1;
2258
2259        bss->dtim_bc_mc = aid0 == 1;
2260
2261        if (have_bits) {
2262                /* Find largest even number N1 so that bits numbered 1 through
2263                 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
2264                 * (N2 + 1) x 8 through 2007 are 0. */
2265                n1 = 0;
2266                for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
2267                        if (bss->tim[i]) {
2268                                n1 = i & 0xfe;
2269                                break;
2270                        }
2271                }
2272                n2 = n1;
2273                for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
2274                        if (bss->tim[i]) {
2275                                n2 = i;
2276                                break;
2277                        }
2278                }
2279
2280                /* Bitmap control */
2281                *pos++ = n1 | aid0;
2282                /* Part Virt Bitmap */
2283                skb_put(skb, n2 - n1);
2284                memcpy(pos, bss->tim + n1, n2 - n1 + 1);
2285
2286                tim[1] = n2 - n1 + 4;
2287        } else {
2288                *pos++ = aid0; /* Bitmap control */
2289                *pos++ = 0; /* Part Virt Bitmap */
2290        }
2291}
2292
2293struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
2294                                         struct ieee80211_vif *vif,
2295                                         u16 *tim_offset, u16 *tim_length)
2296{
2297        struct ieee80211_local *local = hw_to_local(hw);
2298        struct sk_buff *skb = NULL;
2299        struct ieee80211_tx_info *info;
2300        struct ieee80211_sub_if_data *sdata = NULL;
2301        struct ieee80211_if_ap *ap = NULL;
2302        struct beacon_data *beacon;
2303        struct ieee80211_supported_band *sband;
2304        enum ieee80211_band band = local->hw.conf.channel->band;
2305        struct ieee80211_tx_rate_control txrc;
2306
2307        sband = local->hw.wiphy->bands[band];
2308
2309        rcu_read_lock();
2310
2311        sdata = vif_to_sdata(vif);
2312
2313        if (!ieee80211_sdata_running(sdata))
2314                goto out;
2315
2316        if (tim_offset)
2317                *tim_offset = 0;
2318        if (tim_length)
2319                *tim_length = 0;
2320
2321        if (sdata->vif.type == NL80211_IFTYPE_AP) {
2322                ap = &sdata->u.ap;
2323                beacon = rcu_dereference(ap->beacon);
2324                if (beacon) {
2325                        /*
2326                         * headroom, head length,
2327                         * tail length and maximum TIM length
2328                         */
2329                        skb = dev_alloc_skb(local->tx_headroom +
2330                                            beacon->head_len +
2331                                            beacon->tail_len + 256);
2332                        if (!skb)
2333                                goto out;
2334
2335                        skb_reserve(skb, local->tx_headroom);
2336                        memcpy(skb_put(skb, beacon->head_len), beacon->head,
2337                               beacon->head_len);
2338
2339                        /*
2340                         * Not very nice, but we want to allow the driver to call
2341                         * ieee80211_beacon_get() as a response to the set_tim()
2342                         * callback. That, however, is already invoked under the
2343                         * sta_lock to guarantee consistent and race-free update
2344                         * of the tim bitmap in mac80211 and the driver.
2345                         */
2346                        if (local->tim_in_locked_section) {
2347                                ieee80211_beacon_add_tim(sdata, ap, skb,
2348                                                         beacon);
2349                        } else {
2350                                unsigned long flags;
2351
2352                                spin_lock_irqsave(&local->tim_lock, flags);
2353                                ieee80211_beacon_add_tim(sdata, ap, skb,
2354                                                         beacon);
2355                                spin_unlock_irqrestore(&local->tim_lock, flags);
2356                        }
2357
2358                        if (tim_offset)
2359                                *tim_offset = beacon->head_len;
2360                        if (tim_length)
2361                                *tim_length = skb->len - beacon->head_len;
2362
2363                        if (beacon->tail)
2364                                memcpy(skb_put(skb, beacon->tail_len),
2365                                       beacon->tail, beacon->tail_len);
2366                } else
2367                        goto out;
2368        } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
2369                struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2370                struct ieee80211_hdr *hdr;
2371                struct sk_buff *presp = rcu_dereference(ifibss->presp);
2372
2373                if (!presp)
2374                        goto out;
2375
2376                skb = skb_copy(presp, GFP_ATOMIC);
2377                if (!skb)
2378                        goto out;
2379
2380                hdr = (struct ieee80211_hdr *) skb->data;
2381                hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2382                                                 IEEE80211_STYPE_BEACON);
2383        } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
2384                struct ieee80211_mgmt *mgmt;
2385                struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2386                u8 *pos;
2387                int hdr_len = offsetof(struct ieee80211_mgmt, u.beacon) +
2388                              sizeof(mgmt->u.beacon);
2389
2390#ifdef CONFIG_MAC80211_MESH
2391                if (!sdata->u.mesh.mesh_id_len)
2392                        goto out;
2393#endif
2394
2395                if (ifmsh->sync_ops)
2396                        ifmsh->sync_ops->adjust_tbtt(
2397                                                sdata);
2398
2399                skb = dev_alloc_skb(local->tx_headroom +
2400                                    hdr_len +
2401                                    2 + /* NULL SSID */
2402                                    2 + 8 + /* supported rates */
2403                                    2 + 3 + /* DS params */
2404                                    2 + (IEEE80211_MAX_SUPP_RATES - 8) +
2405                                    2 + sizeof(struct ieee80211_ht_cap) +
2406                                    2 + sizeof(struct ieee80211_ht_operation) +
2407                                    2 + sdata->u.mesh.mesh_id_len +
2408                                    2 + sizeof(struct ieee80211_meshconf_ie) +
2409                                    sdata->u.mesh.ie_len);
2410                if (!skb)
2411                        goto out;
2412
2413                skb_reserve(skb, local->hw.extra_tx_headroom);
2414                mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
2415                memset(mgmt, 0, hdr_len);
2416                mgmt->frame_control =
2417                    cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON);
2418                memset(mgmt->da, 0xff, ETH_ALEN);
2419                memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2420                memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2421                mgmt->u.beacon.beacon_int =
2422                        cpu_to_le16(sdata->vif.bss_conf.beacon_int);
2423                mgmt->u.beacon.capab_info |= cpu_to_le16(
2424                        sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
2425
2426                pos = skb_put(skb, 2);
2427                *pos++ = WLAN_EID_SSID;
2428                *pos++ = 0x0;
2429
2430                if (ieee80211_add_srates_ie(sdata, skb, true) ||
2431                    mesh_add_ds_params_ie(skb, sdata) ||
2432                    ieee80211_add_ext_srates_ie(sdata, skb, true) ||
2433                    mesh_add_rsn_ie(skb, sdata) ||
2434                    mesh_add_ht_cap_ie(skb, sdata) ||
2435                    mesh_add_ht_oper_ie(skb, sdata) ||
2436                    mesh_add_meshid_ie(skb, sdata) ||
2437                    mesh_add_meshconf_ie(skb, sdata) ||
2438                    mesh_add_vendor_ies(skb, sdata)) {
2439                        pr_err("o11s: couldn't add ies!\n");
2440                        goto out;
2441                }
2442        } else {
2443                WARN_ON(1);
2444                goto out;
2445        }
2446
2447        info = IEEE80211_SKB_CB(skb);
2448
2449        info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
2450        info->flags |= IEEE80211_TX_CTL_NO_ACK;
2451        info->band = band;
2452
2453        memset(&txrc, 0, sizeof(txrc));
2454        txrc.hw = hw;
2455        txrc.sband = sband;
2456        txrc.bss_conf = &sdata->vif.bss_conf;
2457        txrc.skb = skb;
2458        txrc.reported_rate.idx = -1;
2459        txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
2460        if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
2461                txrc.max_rate_idx = -1;
2462        else
2463                txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
2464        memcpy(txrc.rate_idx_mcs_mask, sdata->rc_rateidx_mcs_mask[band],
2465               sizeof(txrc.rate_idx_mcs_mask));
2466        txrc.bss = true;
2467        rate_control_get_rate(sdata, NULL, &txrc);
2468
2469        info->control.vif = vif;
2470
2471        info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
2472                        IEEE80211_TX_CTL_ASSIGN_SEQ |
2473                        IEEE80211_TX_CTL_FIRST_FRAGMENT;
2474 out:
2475        rcu_read_unlock();
2476        return skb;
2477}
2478EXPORT_SYMBOL(ieee80211_beacon_get_tim);
2479
2480struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
2481                                        struct ieee80211_vif *vif)
2482{
2483        struct ieee80211_if_ap *ap = NULL;
2484        struct sk_buff *presp = NULL, *skb = NULL;
2485        struct ieee80211_hdr *hdr;
2486        struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2487
2488        if (sdata->vif.type != NL80211_IFTYPE_AP)
2489                return NULL;
2490
2491        rcu_read_lock();
2492
2493        ap = &sdata->u.ap;
2494        presp = rcu_dereference(ap->probe_resp);
2495        if (!presp)
2496                goto out;
2497
2498        skb = skb_copy(presp, GFP_ATOMIC);
2499        if (!skb)
2500                goto out;
2501
2502        hdr = (struct ieee80211_hdr *) skb->data;
2503        memset(hdr->addr1, 0, sizeof(hdr->addr1));
2504
2505out:
2506        rcu_read_unlock();
2507        return skb;
2508}
2509EXPORT_SYMBOL(ieee80211_proberesp_get);
2510
2511struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
2512                                     struct ieee80211_vif *vif)
2513{
2514        struct ieee80211_sub_if_data *sdata;
2515        struct ieee80211_if_managed *ifmgd;
2516        struct ieee80211_pspoll *pspoll;
2517        struct ieee80211_local *local;
2518        struct sk_buff *skb;
2519
2520        if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2521                return NULL;
2522
2523        sdata = vif_to_sdata(vif);
2524        ifmgd = &sdata->u.mgd;
2525        local = sdata->local;
2526
2527        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
2528        if (!skb)
2529                return NULL;
2530
2531        skb_reserve(skb, local->hw.extra_tx_headroom);
2532
2533        pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
2534        memset(pspoll, 0, sizeof(*pspoll));
2535        pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
2536                                            IEEE80211_STYPE_PSPOLL);
2537        pspoll->aid = cpu_to_le16(ifmgd->aid);
2538
2539        /* aid in PS-Poll has its two MSBs each set to 1 */
2540        pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
2541
2542        memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
2543        memcpy(pspoll->ta, vif->addr, ETH_ALEN);
2544
2545        return skb;
2546}
2547EXPORT_SYMBOL(ieee80211_pspoll_get);
2548
2549struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
2550                                       struct ieee80211_vif *vif)
2551{
2552        struct ieee80211_hdr_3addr *nullfunc;
2553        struct ieee80211_sub_if_data *sdata;
2554        struct ieee80211_if_managed *ifmgd;
2555        struct ieee80211_local *local;
2556        struct sk_buff *skb;
2557
2558        if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2559                return NULL;
2560
2561        sdata = vif_to_sdata(vif);
2562        ifmgd = &sdata->u.mgd;
2563        local = sdata->local;
2564
2565        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc));
2566        if (!skb)
2567                return NULL;
2568
2569        skb_reserve(skb, local->hw.extra_tx_headroom);
2570
2571        nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb,
2572                                                          sizeof(*nullfunc));
2573        memset(nullfunc, 0, sizeof(*nullfunc));
2574        nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
2575                                              IEEE80211_STYPE_NULLFUNC |
2576                                              IEEE80211_FCTL_TODS);
2577        memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN);
2578        memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
2579        memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN);
2580
2581        return skb;
2582}
2583EXPORT_SYMBOL(ieee80211_nullfunc_get);
2584
2585struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
2586                                       struct ieee80211_vif *vif,
2587                                       const u8 *ssid, size_t ssid_len,
2588                                       const u8 *ie, size_t ie_len)
2589{
2590        struct ieee80211_sub_if_data *sdata;
2591        struct ieee80211_local *local;
2592        struct ieee80211_hdr_3addr *hdr;
2593        struct sk_buff *skb;
2594        size_t ie_ssid_len;
2595        u8 *pos;
2596
2597        sdata = vif_to_sdata(vif);
2598        local = sdata->local;
2599        ie_ssid_len = 2 + ssid_len;
2600
2601        skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
2602                            ie_ssid_len + ie_len);
2603        if (!skb)
2604                return NULL;
2605
2606        skb_reserve(skb, local->hw.extra_tx_headroom);
2607
2608        hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr));
2609        memset(hdr, 0, sizeof(*hdr));
2610        hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2611                                         IEEE80211_STYPE_PROBE_REQ);
2612        memset(hdr->addr1, 0xff, ETH_ALEN);
2613        memcpy(hdr->addr2, vif->addr, ETH_ALEN);
2614        memset(hdr->addr3, 0xff, ETH_ALEN);
2615
2616        pos = skb_put(skb, ie_ssid_len);
2617        *pos++ = WLAN_EID_SSID;
2618        *pos++ = ssid_len;
2619        if (ssid_len)
2620                memcpy(pos, ssid, ssid_len);
2621        pos += ssid_len;
2622
2623        if (ie) {
2624                pos = skb_put(skb, ie_len);
2625                memcpy(pos, ie, ie_len);
2626        }
2627
2628        return skb;
2629}
2630EXPORT_SYMBOL(ieee80211_probereq_get);
2631
2632void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2633                       const void *frame, size_t frame_len,
2634                       const struct ieee80211_tx_info *frame_txctl,
2635                       struct ieee80211_rts *rts)
2636{
2637        const struct ieee80211_hdr *hdr = frame;
2638
2639        rts->frame_control =
2640            cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
2641        rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
2642                                               frame_txctl);
2643        memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
2644        memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
2645}
2646EXPORT_SYMBOL(ieee80211_rts_get);
2647
2648void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
2649                             const void *frame, size_t frame_len,
2650                             const struct ieee80211_tx_info *frame_txctl,
2651                             struct ieee80211_cts *cts)
2652{
2653        const struct ieee80211_hdr *hdr = frame;
2654
2655        cts->frame_control =
2656            cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
2657        cts->duration = ieee80211_ctstoself_duration(hw, vif,
2658                                                     frame_len, frame_txctl);
2659        memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
2660}
2661EXPORT_SYMBOL(ieee80211_ctstoself_get);
2662
2663struct sk_buff *
2664ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
2665                          struct ieee80211_vif *vif)
2666{
2667        struct ieee80211_local *local = hw_to_local(hw);
2668        struct sk_buff *skb = NULL;
2669        struct ieee80211_tx_data tx;
2670        struct ieee80211_sub_if_data *sdata;
2671        struct ieee80211_if_ap *bss = NULL;
2672        struct beacon_data *beacon;
2673        struct ieee80211_tx_info *info;
2674
2675        sdata = vif_to_sdata(vif);
2676        bss = &sdata->u.ap;
2677
2678        rcu_read_lock();
2679        beacon = rcu_dereference(bss->beacon);
2680
2681        if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head)
2682                goto out;
2683
2684        if (bss->dtim_count != 0 || !bss->dtim_bc_mc)
2685                goto out; /* send buffered bc/mc only after DTIM beacon */
2686
2687        while (1) {
2688                skb = skb_dequeue(&bss->ps_bc_buf);
2689                if (!skb)
2690                        goto out;
2691                local->total_ps_buffered--;
2692
2693                if (!skb_queue_empty(&bss->ps_bc_buf) && skb->len >= 2) {
2694                        struct ieee80211_hdr *hdr =
2695                                (struct ieee80211_hdr *) skb->data;
2696                        /* more buffered multicast/broadcast frames ==> set
2697                         * MoreData flag in IEEE 802.11 header to inform PS
2698                         * STAs */
2699                        hdr->frame_control |=
2700                                cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2701                }
2702
2703                if (!ieee80211_tx_prepare(sdata, &tx, skb))
2704                        break;
2705                dev_kfree_skb_any(skb);
2706        }
2707
2708        info = IEEE80211_SKB_CB(skb);
2709
2710        tx.flags |= IEEE80211_TX_PS_BUFFERED;
2711        tx.channel = local->hw.conf.channel;
2712        info->band = tx.channel->band;
2713
2714        if (invoke_tx_handlers(&tx))
2715                skb = NULL;
2716 out:
2717        rcu_read_unlock();
2718
2719        return skb;
2720}
2721EXPORT_SYMBOL(ieee80211_get_buffered_bc);
2722
2723void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
2724                          struct sk_buff *skb, int tid)
2725{
2726        int ac = ieee802_1d_to_ac[tid & 7];
2727
2728        skb_set_mac_header(skb, 0);
2729        skb_set_network_header(skb, 0);
2730        skb_set_transport_header(skb, 0);
2731
2732        skb_set_queue_mapping(skb, ac);
2733        skb->priority = tid;
2734
2735        /*
2736         * The other path calling ieee80211_xmit is from the tasklet,
2737         * and while we can handle concurrent transmissions locking
2738         * requirements are that we do not come into tx with bhs on.
2739         */
2740        local_bh_disable();
2741        ieee80211_xmit(sdata, skb);
2742        local_bh_enable();
2743}
2744
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