net/mac80211/status.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2002-2005, Instant802 Networks, Inc.
   4  * Copyright 2005-2006, Devicescape Software, Inc.
   5  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   6  * Copyright 2008-2010  Johannes Berg <johannes@sipsolutions.net>
   7  * Copyright 2013-2014  Intel Mobile Communications GmbH
   8  */
   9
  10 #include <linux/export.h>
  11 #include <linux/etherdevice.h>
  12 #include <net/mac80211.h>
  13 #include <asm/unaligned.h>
  14 #include "ieee80211_i.h"
  15 #include "rate.h"
  16 #include "mesh.h"
  17 #include "led.h"
  18 #include "wme.h"
  19
  20
  21 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  22                                  struct sk_buff *skb)
  23 {
  24         struct ieee80211_local *local = hw_to_local(hw);
  25         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  26         int tmp;
  27
  28         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  29         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  30                        &local->skb_queue : &local->skb_queue_unreliable, skb);
  31         tmp = skb_queue_len(&local->skb_queue) +
  32                 skb_queue_len(&local->skb_queue_unreliable);
  33         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  34                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  35                 ieee80211_free_txskb(hw, skb);
  36                 tmp--;
  37                 I802_DEBUG_INC(local->tx_status_drop);
  38         }
  39         tasklet_schedule(&local->tasklet);
  40 }
  41 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  42
  43 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  44                                             struct sta_info *sta,
  45                                             struct sk_buff *skb)
  46 {
  47         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  48         struct ieee80211_hdr *hdr = (void *)skb->data;
  49         int ac;
  50
  51         if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
  52                            IEEE80211_TX_CTL_AMPDU)) {
  53                 ieee80211_free_txskb(&local->hw, skb);
  54                 return;
  55         }
  56
  57         /*
  58          * This skb 'survived' a round-trip through the driver, and
  59          * hopefully the driver didn't mangle it too badly. However,
  60          * we can definitely not rely on the control information
  61          * being correct. Clear it so we don't get junk there, and
  62          * indicate that it needs new processing, but must not be
  63          * modified/encrypted again.
  64          */
  65         memset(&info->control, 0, sizeof(info->control));
  66
  67         info->control.jiffies = jiffies;
  68         info->control.vif = &sta->sdata->vif;
  69         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
  70                        IEEE80211_TX_INTFL_RETRANSMISSION;
  71         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  72
  73         sta->status_stats.filtered++;
  74
  75         /*
  76          * Clear more-data bit on filtered frames, it might be set
  77          * but later frames might time out so it might have to be
  78          * clear again ... It's all rather unlikely (this frame
  79          * should time out first, right?) but let's not confuse
  80          * peers unnecessarily.
  81          */
  82         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  83                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  84
  85         if (ieee80211_is_data_qos(hdr->frame_control)) {
  86                 u8 *p = ieee80211_get_qos_ctl(hdr);
  87                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  88
  89                 /*
  90                  * Clear EOSP if set, this could happen e.g.
  91                  * if an absence period (us being a P2P GO)
  92                  * shortens the SP.
  93                  */
  94                 if (*p & IEEE80211_QOS_CTL_EOSP)
  95                         *p &= ~IEEE80211_QOS_CTL_EOSP;
  96                 ac = ieee80211_ac_from_tid(tid);
  97         } else {
  98                 ac = IEEE80211_AC_BE;
  99         }
 100
 101         /*
 102          * Clear the TX filter mask for this STA when sending the next
 103          * packet. If the STA went to power save mode, this will happen
 104          * when it wakes up for the next time.
 105          */
 106         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 107         ieee80211_clear_fast_xmit(sta);
 108
 109         /*
 110          * This code races in the following way:
 111          *
 112          *  (1) STA sends frame indicating it will go to sleep and does so
 113          *  (2) hardware/firmware adds STA to filter list, passes frame up
 114          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 115          *  (4) we get TX status before having processed the frame and
 116          *      knowing that the STA has gone to sleep.
 117          *
 118          * This is actually quite unlikely even when both those events are
 119          * processed from interrupts coming in quickly after one another or
 120          * even at the same time because we queue both TX status events and
 121          * RX frames to be processed by a tasklet and process them in the
 122          * same order that they were received or TX status last. Hence, there
 123          * is no race as long as the frame RX is processed before the next TX
 124          * status, which drivers can ensure, see below.
 125          *
 126          * Note that this can only happen if the hardware or firmware can
 127          * actually add STAs to the filter list, if this is done by the
 128          * driver in response to set_tim() (which will only reduce the race
 129          * this whole filtering tries to solve, not completely solve it)
 130          * this situation cannot happen.
 131          *
 132          * To completely solve this race drivers need to make sure that they
 133          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 134          *      functions and
 135          *  (b) always process RX events before TX status events if ordering
 136          *      can be unknown, for example with different interrupt status
 137          *      bits.
 138          *  (c) if PS mode transitions are manual (i.e. the flag
 139          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 140          *      changes before calling TX status events if ordering can be
 141          *      unknown.
 142          */
 143         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 144             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 145                 skb_queue_tail(&sta->tx_filtered[ac], skb);
 146                 sta_info_recalc_tim(sta);
 147
 148                 if (!timer_pending(&local->sta_cleanup))
 149                         mod_timer(&local->sta_cleanup,
 150                                   round_jiffies(jiffies +
 151                                                 STA_INFO_CLEANUP_INTERVAL));
 152                 return;
 153         }
 154
 155         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 156             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 157                 /* Software retry the packet once */
 158                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 159                 ieee80211_add_pending_skb(local, skb);
 160                 return;
 161         }
 162
 163         ps_dbg_ratelimited(sta->sdata,
 164                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 165                            skb_queue_len(&sta->tx_filtered[ac]),
 166                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 167         ieee80211_free_txskb(&local->hw, skb);
 168 }
 169
 170 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 171 {
 172         struct tid_ampdu_tx *tid_tx;
 173
 174         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 175         if (!tid_tx || !tid_tx->bar_pending)
 176                 return;
 177
 178         tid_tx->bar_pending = false;
 179         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 180 }
 181
 182 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 183 {
 184         struct ieee80211_mgmt *mgmt = (void *) skb->data;
 185         struct ieee80211_local *local = sta->local;
 186         struct ieee80211_sub_if_data *sdata = sta->sdata;
 187         struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
 188
 189         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
 190                 sta->status_stats.last_ack = jiffies;
 191                 if (txinfo->status.is_valid_ack_signal) {
 192                         sta->status_stats.last_ack_signal =
 193                                          (s8)txinfo->status.ack_signal;
 194                         sta->status_stats.ack_signal_filled = true;
 195                         ewma_avg_signal_add(&sta->status_stats.avg_ack_signal,
 196                                             -txinfo->status.ack_signal);
 197                 }
 198         }
 199
 200         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 201                 struct ieee80211_hdr *hdr = (void *) skb->data;
 202                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 203                 u16 tid = qc[0] & 0xf;
 204
 205                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 206         }
 207
 208         if (ieee80211_is_action(mgmt->frame_control) &&
 209             !ieee80211_has_protected(mgmt->frame_control) &&
 210             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 211             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 212             ieee80211_sdata_running(sdata)) {
 213                 enum ieee80211_smps_mode smps_mode;
 214
 215                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 216                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 217                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 218                         break;
 219                 case WLAN_HT_SMPS_CONTROL_STATIC:
 220                         smps_mode = IEEE80211_SMPS_STATIC;
 221                         break;
 222                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 223                 default: /* shouldn't happen since we don't send that */
 224                         smps_mode = IEEE80211_SMPS_OFF;
 225                         break;
 226                 }
 227
 228                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 229                         /*
 230                          * This update looks racy, but isn't -- if we come
 231                          * here we've definitely got a station that we're
 232                          * talking to, and on a managed interface that can
 233                          * only be the AP. And the only other place updating
 234                          * this variable in managed mode is before association.
 235                          */
 236                         sdata->smps_mode = smps_mode;
 237                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 238                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 239                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 240                         sta->known_smps_mode = smps_mode;
 241                 }
 242         }
 243 }
 244
 245 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 246 {
 247         struct tid_ampdu_tx *tid_tx;
 248
 249         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 250         if (!tid_tx)
 251                 return;
 252
 253         tid_tx->failed_bar_ssn = ssn;
 254         tid_tx->bar_pending = true;
 255 }
 256
 257 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 258                                      struct ieee80211_tx_status *status)
 259 {
 260         int len = sizeof(struct ieee80211_radiotap_header);
 261
 262         /* IEEE80211_RADIOTAP_RATE rate */
 263         if (status && status->rate && !(status->rate->flags &
 264                                         (RATE_INFO_FLAGS_MCS |
 265                                          RATE_INFO_FLAGS_DMG |
 266                                          RATE_INFO_FLAGS_EDMG |
 267                                          RATE_INFO_FLAGS_VHT_MCS |
 268                                          RATE_INFO_FLAGS_HE_MCS)))
 269                 len += 2;
 270         else if (info->status.rates[0].idx >= 0 &&
 271                  !(info->status.rates[0].flags &
 272                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 273                 len += 2;
 274
 275         /* IEEE80211_RADIOTAP_TX_FLAGS */
 276         len += 2;
 277
 278         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 279         len += 1;
 280
 281         /* IEEE80211_RADIOTAP_MCS
 282          * IEEE80211_RADIOTAP_VHT */
 283         if (status && status->rate) {
 284                 if (status->rate->flags & RATE_INFO_FLAGS_MCS)
 285                         len += 3;
 286                 else if (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)
 287                         len = ALIGN(len, 2) + 12;
 288                 else if (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)
 289                         len = ALIGN(len, 2) + 12;
 290         } else if (info->status.rates[0].idx >= 0) {
 291                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 292                         len += 3;
 293                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 294                         len = ALIGN(len, 2) + 12;
 295         }
 296
 297         return len;
 298 }
 299
 300 static void
 301 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 302                                  struct ieee80211_supported_band *sband,
 303                                  struct sk_buff *skb, int retry_count,
 304                                  int rtap_len, int shift,
 305                                  struct ieee80211_tx_status *status)
 306 {
 307         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 308         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 309         struct ieee80211_radiotap_header *rthdr;
 310         unsigned char *pos;
 311         u16 legacy_rate = 0;
 312         u16 txflags;
 313
 314         rthdr = skb_push(skb, rtap_len);
 315
 316         memset(rthdr, 0, rtap_len);
 317         rthdr->it_len = cpu_to_le16(rtap_len);
 318         rthdr->it_present =
 319                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 320                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 321         pos = (unsigned char *)(rthdr + 1);
 322
 323         /*
 324          * XXX: Once radiotap gets the bitmap reset thing the vendor
 325          *      extensions proposal contains, we can actually report
 326          *      the whole set of tries we did.
 327          */
 328
 329         /* IEEE80211_RADIOTAP_RATE */
 330
 331         if (status && status->rate) {
 332                 if (!(status->rate->flags & (RATE_INFO_FLAGS_MCS |
 333                                              RATE_INFO_FLAGS_DMG |
 334                                              RATE_INFO_FLAGS_EDMG |
 335                                              RATE_INFO_FLAGS_VHT_MCS |
 336                                              RATE_INFO_FLAGS_HE_MCS)))
 337                         legacy_rate = status->rate->legacy;
 338         } else if (info->status.rates[0].idx >= 0 &&
 339                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 340                                                   IEEE80211_TX_RC_VHT_MCS)))
 341                 legacy_rate =
 342                         sband->bitrates[info->status.rates[0].idx].bitrate;
 343
 344         if (legacy_rate) {
 345                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 346                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 347                 /* padding for tx flags */
 348                 pos += 2;
 349         }
 350
 351         /* IEEE80211_RADIOTAP_TX_FLAGS */
 352         txflags = 0;
 353         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 354             !is_multicast_ether_addr(hdr->addr1))
 355                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 356
 357         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 358                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 359         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 360                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 361
 362         put_unaligned_le16(txflags, pos);
 363         pos += 2;
 364
 365         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 366         /* for now report the total retry_count */
 367         *pos = retry_count;
 368         pos++;
 369
 370         if (status && status->rate &&
 371             (status->rate->flags & RATE_INFO_FLAGS_MCS)) {
 372                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 373                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 374                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 375                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 376                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 377                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 378                 if (status->rate->bw == RATE_INFO_BW_40)
 379                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 380                 pos[2] = status->rate->mcs;
 381                 pos += 3;
 382         } else if (status && status->rate &&
 383                    (status->rate->flags & RATE_INFO_FLAGS_VHT_MCS)) {
 384                 u16 known = local->hw.radiotap_vht_details &
 385                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 386                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 387
 388                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 389
 390                 /* required alignment from rthdr */
 391                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 392
 393                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 394                 put_unaligned_le16(known, pos);
 395                 pos += 2;
 396
 397                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 398                 if (status->rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 399                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 400                 pos++;
 401
 402                 /* u8 bandwidth */
 403                 switch (status->rate->bw) {
 404                 case RATE_INFO_BW_160:
 405                         *pos = 11;
 406                         break;
 407                 case RATE_INFO_BW_80:
 408                         *pos = 4;
 409                         break;
 410                 case RATE_INFO_BW_40:
 411                         *pos = 1;
 412                         break;
 413                 default:
 414                         *pos = 0;
 415                         break;
 416                 }
 417                 pos++;
 418
 419                 /* u8 mcs_nss[4] */
 420                 *pos = (status->rate->mcs << 4) | status->rate->nss;
 421                 pos += 4;
 422
 423                 /* u8 coding */
 424                 pos++;
 425                 /* u8 group_id */
 426                 pos++;
 427                 /* u16 partial_aid */
 428                 pos += 2;
 429         } else if (status && status->rate &&
 430                    (status->rate->flags & RATE_INFO_FLAGS_HE_MCS)) {
 431                 struct ieee80211_radiotap_he *he;
 432
 433                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE);
 434
 435                 /* required alignment from rthdr */
 436                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 437                 he = (struct ieee80211_radiotap_he *)pos;
 438
 439                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 440                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 441                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 442                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 443
 444                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 445
 446 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 447
 448                 he->data6 |= HE_PREP(DATA6_NSTS, status->rate->nss);
 449
 450 #define CHECK_GI(s) \
 451         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 452         (int)NL80211_RATE_INFO_HE_GI_##s)
 453
 454                 CHECK_GI(0_8);
 455                 CHECK_GI(1_6);
 456                 CHECK_GI(3_2);
 457
 458                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status->rate->mcs);
 459                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status->rate->he_dcm);
 460
 461                 he->data5 |= HE_PREP(DATA5_GI, status->rate->he_gi);
 462
 463                 switch (status->rate->bw) {
 464                 case RATE_INFO_BW_20:
 465                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 466                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 467                         break;
 468                 case RATE_INFO_BW_40:
 469                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 470                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 471                         break;
 472                 case RATE_INFO_BW_80:
 473                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 474                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 475                         break;
 476                 case RATE_INFO_BW_160:
 477                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 478                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 479                         break;
 480                 case RATE_INFO_BW_HE_RU:
 481 #define CHECK_RU_ALLOC(s) \
 482         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 483         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 484
 485                         CHECK_RU_ALLOC(26);
 486                         CHECK_RU_ALLOC(52);
 487                         CHECK_RU_ALLOC(106);
 488                         CHECK_RU_ALLOC(242);
 489                         CHECK_RU_ALLOC(484);
 490                         CHECK_RU_ALLOC(996);
 491                         CHECK_RU_ALLOC(2x996);
 492
 493                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 494                                              status->rate->he_ru_alloc + 4);
 495                         break;
 496                 default:
 497                         WARN_ONCE(1, "Invalid SU BW %d\n", status->rate->bw);
 498                 }
 499
 500                 pos += sizeof(struct ieee80211_radiotap_he);
 501         }
 502
 503         if ((status && status->rate) || info->status.rates[0].idx < 0)
 504                 return;
 505
 506         /* IEEE80211_RADIOTAP_MCS
 507          * IEEE80211_RADIOTAP_VHT */
 508         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 509                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 510                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 511                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 512                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 513                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 514                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 515                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 516                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 517                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 518                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 519                 pos[2] = info->status.rates[0].idx;
 520                 pos += 3;
 521         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 522                 u16 known = local->hw.radiotap_vht_details &
 523                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 524                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 525
 526                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 527
 528                 /* required alignment from rthdr */
 529                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 530
 531                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 532                 put_unaligned_le16(known, pos);
 533                 pos += 2;
 534
 535                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 536                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 537                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 538                 pos++;
 539
 540                 /* u8 bandwidth */
 541                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 542                         *pos = 1;
 543                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 544                         *pos = 4;
 545                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 546                         *pos = 11;
 547                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 548                         *pos = 0;
 549                 pos++;
 550
 551                 /* u8 mcs_nss[4] */
 552                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 553                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 554                 pos += 4;
 555
 556                 /* u8 coding */
 557                 pos++;
 558                 /* u8 group_id */
 559                 pos++;
 560                 /* u16 partial_aid */
 561                 pos += 2;
 562         }
 563 }
 564
 565 /*
 566  * Handles the tx for TDLS teardown frames.
 567  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 568  */
 569 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 570                                         struct ieee80211_sub_if_data *sdata,
 571                                         struct sk_buff *skb, u32 flags)
 572 {
 573         struct sk_buff *teardown_skb;
 574         struct sk_buff *orig_teardown_skb;
 575         bool is_teardown = false;
 576
 577         /* Get the teardown data we need and free the lock */
 578         spin_lock(&sdata->u.mgd.teardown_lock);
 579         teardown_skb = sdata->u.mgd.teardown_skb;
 580         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 581         if ((skb == orig_teardown_skb) && teardown_skb) {
 582                 sdata->u.mgd.teardown_skb = NULL;
 583                 sdata->u.mgd.orig_teardown_skb = NULL;
 584                 is_teardown = true;
 585         }
 586         spin_unlock(&sdata->u.mgd.teardown_lock);
 587
 588         if (is_teardown) {
 589                 /* This mechanism relies on being able to get ACKs */
 590                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 591
 592                 /* Check if peer has ACKed */
 593                 if (flags & IEEE80211_TX_STAT_ACK) {
 594                         dev_kfree_skb_any(teardown_skb);
 595                 } else {
 596                         tdls_dbg(sdata,
 597                                  "TDLS Resending teardown through AP\n");
 598
 599                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 600                 }
 601         }
 602 }
 603
 604 static struct ieee80211_sub_if_data *
 605 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 606 {
 607         struct ieee80211_sub_if_data *sdata;
 608
 609         if (skb->dev) {
 610                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 611                         if (!sdata->dev)
 612                                 continue;
 613
 614                         if (skb->dev == sdata->dev)
 615                                 return sdata;
 616                 }
 617
 618                 return NULL;
 619         }
 620
 621         return rcu_dereference(local->p2p_sdata);
 622 }
 623
 624 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 625                                      struct ieee80211_tx_info *info,
 626                                      bool acked, bool dropped)
 627 {
 628         struct sk_buff *skb;
 629         unsigned long flags;
 630
 631         spin_lock_irqsave(&local->ack_status_lock, flags);
 632         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 633         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 634
 635         if (!skb)
 636                 return;
 637
 638         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 639                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 640                 struct ieee80211_sub_if_data *sdata;
 641                 struct ieee80211_hdr *hdr = (void *)skb->data;
 642                 __be16 ethertype = 0;
 643
 644                 if (skb->len >= ETH_HLEN && skb->protocol == cpu_to_be16(ETH_P_802_3))
 645                         skb_copy_bits(skb, 2 * ETH_ALEN, &ethertype, ETH_TLEN);
 646
 647                 rcu_read_lock();
 648                 sdata = ieee80211_sdata_from_skb(local, skb);
 649                 if (sdata) {
 650                         if (ethertype == sdata->control_port_protocol ||
 651                             ethertype == cpu_to_be16(ETH_P_PREAUTH))
 652                                 cfg80211_control_port_tx_status(&sdata->wdev,
 653                                                                 cookie,
 654                                                                 skb->data,
 655                                                                 skb->len,
 656                                                                 acked,
 657                                                                 GFP_ATOMIC);
 658                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 659                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 660                                                       cookie, acked,
 661                                                       info->status.ack_signal,
 662                                                       info->status.is_valid_ack_signal,
 663                                                       GFP_ATOMIC);
 664                         else if (ieee80211_is_mgmt(hdr->frame_control))
 665                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 666                                                         skb->data, skb->len,
 667                                                         acked, GFP_ATOMIC);
 668                         else
 669                                 pr_warn("Unknown status report in ack skb\n");
 670
 671                 }
 672                 rcu_read_unlock();
 673
 674                 dev_kfree_skb_any(skb);
 675         } else if (dropped) {
 676                 dev_kfree_skb_any(skb);
 677         } else {
 678                 /* consumes skb */
 679                 skb_complete_wifi_ack(skb, acked);
 680         }
 681 }
 682
 683 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 684                                       struct sk_buff *skb, bool dropped)
 685 {
 686         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 687         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 688         struct ieee80211_hdr *hdr = (void *)skb->data;
 689         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 690
 691         if (dropped)
 692                 acked = false;
 693
 694         if (tx_time_est) {
 695                 struct sta_info *sta;
 696
 697                 rcu_read_lock();
 698
 699                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 700                 ieee80211_sta_update_pending_airtime(local, sta,
 701                                                      skb_get_queue_mapping(skb),
 702                                                      tx_time_est,
 703                                                      true);
 704                 rcu_read_unlock();
 705         }
 706
 707         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 708                 struct ieee80211_sub_if_data *sdata;
 709
 710                 rcu_read_lock();
 711
 712                 sdata = ieee80211_sdata_from_skb(local, skb);
 713
 714                 if (!sdata) {
 715                         skb->dev = NULL;
 716                 } else {
 717                         unsigned int hdr_size =
 718                                 ieee80211_hdrlen(hdr->frame_control);
 719
 720                         /* Check to see if packet is a TDLS teardown packet */
 721                         if (ieee80211_is_data(hdr->frame_control) &&
 722                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 723                              WLAN_TDLS_TEARDOWN))
 724                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 725                                                             info->flags);
 726                         else
 727                                 ieee80211_mgd_conn_tx_status(sdata,
 728                                                              hdr->frame_control,
 729                                                              acked);
 730                 }
 731
 732                 rcu_read_unlock();
 733         } else if (info->ack_frame_id) {
 734                 ieee80211_report_ack_skb(local, info, acked, dropped);
 735         }
 736
 737         if (!dropped && skb->destructor) {
 738                 skb->wifi_acked_valid = 1;
 739                 skb->wifi_acked = acked;
 740         }
 741
 742         ieee80211_led_tx(local);
 743
 744         if (skb_has_frag_list(skb)) {
 745                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 746                 skb_shinfo(skb)->frag_list = NULL;
 747         }
 748 }
 749
 750 /*
 751  * Use a static threshold for now, best value to be determined
 752  * by testing ...
 753  * Should it depend on:
 754  *  - on # of retransmissions
 755  *  - current throughput (higher value for higher tpt)?
 756  */
 757 #define STA_LOST_PKT_THRESHOLD  50
 758 #define STA_LOST_TDLS_PKT_THRESHOLD     10
 759 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 760
 761 static void ieee80211_lost_packet(struct sta_info *sta,
 762                                   struct ieee80211_tx_info *info)
 763 {
 764         /* If driver relies on its own algorithm for station kickout, skip
 765          * mac80211 packet loss mechanism.
 766          */
 767         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 768                 return;
 769
 770         /* This packet was aggregated but doesn't carry status info */
 771         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 772             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 773                 return;
 774
 775         sta->status_stats.lost_packets++;
 776         if (!sta->sta.tdls &&
 777             sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
 778                 return;
 779
 780         /*
 781          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 782          * of the last packets were lost, and that no ACK was received in the
 783          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 784          * mechanism.
 785          */
 786         if (sta->sta.tdls &&
 787             (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
 788              time_before(jiffies,
 789                          sta->status_stats.last_tdls_pkt_time +
 790                          STA_LOST_TDLS_PKT_TIME)))
 791                 return;
 792
 793         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 794                                     sta->status_stats.lost_packets, GFP_ATOMIC);
 795         sta->status_stats.lost_packets = 0;
 796 }
 797
 798 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 799                                   struct ieee80211_tx_info *info,
 800                                   int *retry_count)
 801 {
 802         int rates_idx = -1;
 803         int count = -1;
 804         int i;
 805
 806         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 807                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 808                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 809                         /* just the first aggr frame carry status info */
 810                         info->status.rates[i].idx = -1;
 811                         info->status.rates[i].count = 0;
 812                         break;
 813                 } else if (info->status.rates[i].idx < 0) {
 814                         break;
 815                 } else if (i >= hw->max_report_rates) {
 816                         /* the HW cannot have attempted that rate */
 817                         info->status.rates[i].idx = -1;
 818                         info->status.rates[i].count = 0;
 819                         break;
 820                 }
 821
 822                 count += info->status.rates[i].count;
 823         }
 824         rates_idx = i - 1;
 825
 826         if (count < 0)
 827                 count = 0;
 828
 829         *retry_count = count;
 830         return rates_idx;
 831 }
 832
 833 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 834                           struct ieee80211_supported_band *sband,
 835                           int retry_count, int shift, bool send_to_cooked,
 836                           struct ieee80211_tx_status *status)
 837 {
 838         struct sk_buff *skb2;
 839         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 840         struct ieee80211_sub_if_data *sdata;
 841         struct net_device *prev_dev = NULL;
 842         int rtap_len;
 843
 844         /* send frame to monitor interfaces now */
 845         rtap_len = ieee80211_tx_radiotap_len(info, status);
 846         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 847                 pr_err("ieee80211_tx_status: headroom too small\n");
 848                 dev_kfree_skb(skb);
 849                 return;
 850         }
 851         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 852                                          rtap_len, shift, status);
 853
 854         /* XXX: is this sufficient for BPF? */
 855         skb_reset_mac_header(skb);
 856         skb->ip_summed = CHECKSUM_UNNECESSARY;
 857         skb->pkt_type = PACKET_OTHERHOST;
 858         skb->protocol = htons(ETH_P_802_2);
 859         memset(skb->cb, 0, sizeof(skb->cb));
 860
 861         rcu_read_lock();
 862         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 863                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 864                         if (!ieee80211_sdata_running(sdata))
 865                                 continue;
 866
 867                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 868                             !send_to_cooked)
 869                                 continue;
 870
 871                         if (prev_dev) {
 872                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 873                                 if (skb2) {
 874                                         skb2->dev = prev_dev;
 875                                         netif_rx(skb2);
 876                                 }
 877                         }
 878
 879                         prev_dev = sdata->dev;
 880                 }
 881         }
 882         if (prev_dev) {
 883                 skb->dev = prev_dev;
 884                 netif_rx(skb);
 885                 skb = NULL;
 886         }
 887         rcu_read_unlock();
 888         dev_kfree_skb(skb);
 889 }
 890
 891 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 892                                   struct ieee80211_tx_status *status)
 893 {
 894         struct sk_buff *skb = status->skb;
 895         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 896         struct ieee80211_local *local = hw_to_local(hw);
 897         struct ieee80211_tx_info *info = status->info;
 898         struct sta_info *sta;
 899         __le16 fc;
 900         struct ieee80211_supported_band *sband;
 901         int retry_count;
 902         int rates_idx;
 903         bool send_to_cooked;
 904         bool acked;
 905         bool noack_success;
 906         struct ieee80211_bar *bar;
 907         int shift = 0;
 908         int tid = IEEE80211_NUM_TIDS;
 909         u16 tx_time_est;
 910
 911         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
 912
 913         sband = local->hw.wiphy->bands[info->band];
 914         fc = hdr->frame_control;
 915
 916         if (status->sta) {
 917                 sta = container_of(status->sta, struct sta_info, sta);
 918                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 919
 920                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 921                         clear_sta_flag(sta, WLAN_STA_SP);
 922
 923                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 924                 noack_success = !!(info->flags &
 925                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 926
 927                 /* mesh Peer Service Period support */
 928                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 929                     ieee80211_is_data_qos(fc))
 930                         ieee80211_mpsp_trigger_process(
 931                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 932
 933                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 934                         /*
 935                          * The STA is in power save mode, so assume
 936                          * that this TX packet failed because of that.
 937                          */
 938                         ieee80211_handle_filtered_frame(local, sta, skb);
 939                         return;
 940                 }
 941
 942                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 943                     (ieee80211_is_data(hdr->frame_control)) &&
 944                     (rates_idx != -1))
 945                         sta->tx_stats.last_rate =
 946                                 info->status.rates[rates_idx];
 947
 948                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 949                     (ieee80211_is_data_qos(fc))) {
 950                         u16 ssn;
 951                         u8 *qc;
 952
 953                         qc = ieee80211_get_qos_ctl(hdr);
 954                         tid = qc[0] & 0xf;
 955                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 956                                                 & IEEE80211_SCTL_SEQ);
 957                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 958                                            tid, ssn);
 959                 } else if (ieee80211_is_data_qos(fc)) {
 960                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 961
 962                         tid = qc[0] & 0xf;
 963                 }
 964
 965                 if (!acked && ieee80211_is_back_req(fc)) {
 966                         u16 control;
 967
 968                         /*
 969                          * BAR failed, store the last SSN and retry sending
 970                          * the BAR when the next unicast transmission on the
 971                          * same TID succeeds.
 972                          */
 973                         bar = (struct ieee80211_bar *) skb->data;
 974                         control = le16_to_cpu(bar->control);
 975                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 976                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 977
 978                                 tid = (control &
 979                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 980                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 981
 982                                 ieee80211_set_bar_pending(sta, tid, ssn);
 983                         }
 984                 }
 985
 986                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 987                         ieee80211_handle_filtered_frame(local, sta, skb);
 988                         return;
 989                 } else {
 990                         if (!acked && !noack_success)
 991                                 sta->status_stats.retry_failed++;
 992                         sta->status_stats.retry_count += retry_count;
 993
 994                         if (ieee80211_is_data_present(fc)) {
 995                                 if (!acked && !noack_success)
 996                                         sta->status_stats.msdu_failed[tid]++;
 997
 998                                 sta->status_stats.msdu_retries[tid] +=
 999                                         retry_count;
1000                         }
1001                 }
1002
1003                 rate_control_tx_status(local, sband, status);
1004                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1005                         ieee80211s_update_metric(local, sta, status);
1006
1007                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
1008                         ieee80211_frame_acked(sta, skb);
1009
1010                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
1011                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1012                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
1013                                                 acked, info->status.tx_time);
1014
1015                 if (info->status.tx_time &&
1016                     wiphy_ext_feature_isset(local->hw.wiphy,
1017                                             NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
1018                         ieee80211_sta_register_airtime(&sta->sta, tid,
1019                                                        info->status.tx_time, 0);
1020
1021                 if ((tx_time_est = ieee80211_info_get_tx_time_est(info)) > 0) {
1022                         /* Do this here to avoid the expensive lookup of the sta
1023                          * in ieee80211_report_used_skb().
1024                          */
1025                         ieee80211_sta_update_pending_airtime(local, sta,
1026                                                              skb_get_queue_mapping(skb),
1027                                                              tx_time_est,
1028                                                              true);
1029                         ieee80211_info_set_tx_time_est(info, 0);
1030                 }
1031
1032                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1033                         if (acked) {
1034                                 if (sta->status_stats.lost_packets)
1035                                         sta->status_stats.lost_packets = 0;
1036
1037                                 /* Track when last TDLS packet was ACKed */
1038                                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
1039                                         sta->status_stats.last_tdls_pkt_time =
1040                                                 jiffies;
1041                         } else if (noack_success) {
1042                                 /* nothing to do here, do not account as lost */
1043                         } else {
1044                                 ieee80211_lost_packet(sta, info);
1045                         }
1046                 }
1047         }
1048
1049         /* SNMP counters
1050          * Fragments are passed to low-level drivers as separate skbs, so these
1051          * are actually fragments, not frames. Update frame counters only for
1052          * the first fragment of the frame. */
1053         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1054             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1055                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1056                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1057                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1058                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1059                         if (retry_count > 0)
1060                                 I802_DEBUG_INC(local->dot11RetryCount);
1061                         if (retry_count > 1)
1062                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1063                 }
1064
1065                 /* This counter shall be incremented for an acknowledged MPDU
1066                  * with an individual address in the address 1 field or an MPDU
1067                  * with a multicast address in the address 1 field of type Data
1068                  * or Management. */
1069                 if (!is_multicast_ether_addr(hdr->addr1) ||
1070                     ieee80211_is_data(fc) ||
1071                     ieee80211_is_mgmt(fc))
1072                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1073         } else {
1074                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1075                         I802_DEBUG_INC(local->dot11FailedCount);
1076         }
1077
1078         if (ieee80211_is_any_nullfunc(fc) &&
1079             ieee80211_has_pm(fc) &&
1080             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1081             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1082             local->ps_sdata && !(local->scanning)) {
1083                 if (info->flags & IEEE80211_TX_STAT_ACK) {
1084                         local->ps_sdata->u.mgd.flags |=
1085                                         IEEE80211_STA_NULLFUNC_ACKED;
1086                 } else
1087                         mod_timer(&local->dynamic_ps_timer, jiffies +
1088                                         msecs_to_jiffies(10));
1089         }
1090
1091         ieee80211_report_used_skb(local, skb, false);
1092
1093         /* this was a transmitted frame, but now we want to reuse it */
1094         skb_orphan(skb);
1095
1096         /* Need to make a copy before skb->cb gets cleared */
1097         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1098                          !(ieee80211_is_data(fc));
1099
1100         /*
1101          * This is a bit racy but we can avoid a lot of work
1102          * with this test...
1103          */
1104         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1105                 dev_kfree_skb(skb);
1106                 return;
1107         }
1108
1109         /* send to monitor interfaces */
1110         ieee80211_tx_monitor(local, skb, sband, retry_count, shift,
1111                              send_to_cooked, status);
1112 }
1113
1114 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1115 {
1116         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1117         struct ieee80211_local *local = hw_to_local(hw);
1118         struct ieee80211_tx_status status = {
1119                 .skb = skb,
1120                 .info = IEEE80211_SKB_CB(skb),
1121         };
1122         struct sta_info *sta;
1123
1124         rcu_read_lock();
1125
1126         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1127         if (sta)
1128                 status.sta = &sta->sta;
1129
1130         __ieee80211_tx_status(hw, &status);
1131         rcu_read_unlock();
1132 }
1133 EXPORT_SYMBOL(ieee80211_tx_status);
1134
1135 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1136                              struct ieee80211_tx_status *status)
1137 {
1138         struct ieee80211_local *local = hw_to_local(hw);
1139         struct ieee80211_tx_info *info = status->info;
1140         struct ieee80211_sta *pubsta = status->sta;
1141         struct ieee80211_supported_band *sband;
1142         int retry_count;
1143         bool acked, noack_success;
1144
1145         if (status->skb)
1146                 return __ieee80211_tx_status(hw, status);
1147
1148         if (!status->sta)
1149                 return;
1150
1151         ieee80211_tx_get_rates(hw, info, &retry_count);
1152
1153         sband = hw->wiphy->bands[info->band];
1154
1155         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1156         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1157
1158         if (pubsta) {
1159                 struct sta_info *sta;
1160
1161                 sta = container_of(pubsta, struct sta_info, sta);
1162
1163                 if (!acked && !noack_success)
1164                         sta->status_stats.retry_failed++;
1165                 sta->status_stats.retry_count += retry_count;
1166
1167                 if (acked) {
1168                         sta->status_stats.last_ack = jiffies;
1169
1170                         if (sta->status_stats.lost_packets)
1171                                 sta->status_stats.lost_packets = 0;
1172
1173                         /* Track when last TDLS packet was ACKed */
1174                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
1175                                 sta->status_stats.last_tdls_pkt_time = jiffies;
1176                 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1177                         return;
1178                 } else if (noack_success) {
1179                         /* nothing to do here, do not account as lost */
1180                 } else {
1181                         ieee80211_lost_packet(sta, info);
1182                 }
1183
1184                 rate_control_tx_status(local, sband, status);
1185                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1186                         ieee80211s_update_metric(local, sta, status);
1187         }
1188
1189         if (acked || noack_success) {
1190                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1191                 if (!pubsta)
1192                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1193                 if (retry_count > 0)
1194                         I802_DEBUG_INC(local->dot11RetryCount);
1195                 if (retry_count > 1)
1196                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1197         } else {
1198                 I802_DEBUG_INC(local->dot11FailedCount);
1199         }
1200 }
1201 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1202
1203 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1204                               struct ieee80211_sta *pubsta,
1205                               struct ieee80211_tx_info *info)
1206 {
1207         struct ieee80211_local *local = hw_to_local(hw);
1208         struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1209         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1210         struct ieee80211_tx_status status = {
1211                 .info = info,
1212                 .sta = pubsta,
1213         };
1214
1215         rate_control_tx_status(local, sband, &status);
1216
1217         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1218                 sta->tx_stats.last_rate = info->status.rates[0];
1219 }
1220 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1221
1222 void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1223                               struct ieee80211_vif *vif,
1224                               struct sk_buff *skb)
1225 {
1226         struct ieee80211_local *local = hw_to_local(hw);
1227         struct ieee80211_sub_if_data *sdata;
1228         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1229         struct sta_info *sta;
1230         int retry_count;
1231         int rates_idx;
1232         bool acked;
1233
1234         sdata = vif_to_sdata(vif);
1235
1236         acked = info->flags & IEEE80211_TX_STAT_ACK;
1237         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1238
1239         rcu_read_lock();
1240
1241         if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
1242                 goto counters_update;
1243
1244         if (IS_ERR(sta))
1245                 goto counters_update;
1246
1247         if (!acked)
1248                 sta->status_stats.retry_failed++;
1249
1250         if (rates_idx != -1)
1251                 sta->tx_stats.last_rate = info->status.rates[rates_idx];
1252
1253         sta->status_stats.retry_count += retry_count;
1254
1255         if (ieee80211_hw_check(hw, REPORTS_TX_ACK_STATUS)) {
1256                 if (acked && vif->type == NL80211_IFTYPE_STATION)
1257                         ieee80211_sta_reset_conn_monitor(sdata);
1258
1259                 sta->status_stats.last_ack = jiffies;
1260                 if (info->flags & IEEE80211_TX_STAT_ACK) {
1261                         if (sta->status_stats.lost_packets)
1262                                 sta->status_stats.lost_packets = 0;
1263
1264                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
1265                                 sta->status_stats.last_tdls_pkt_time = jiffies;
1266                 } else {
1267                         ieee80211_lost_packet(sta, info);
1268                 }
1269         }
1270
1271 counters_update:
1272         rcu_read_unlock();
1273         ieee80211_led_tx(local);
1274
1275         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1276             !(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED))
1277                 goto skip_stats_update;
1278
1279         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1280         if (is_multicast_ether_addr(skb->data))
1281                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1282         if (retry_count > 0)
1283                 I802_DEBUG_INC(local->dot11RetryCount);
1284         if (retry_count > 1)
1285                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1286
1287 skip_stats_update:
1288         ieee80211_report_used_skb(local, skb, false);
1289         dev_kfree_skb(skb);
1290 }
1291 EXPORT_SYMBOL(ieee80211_tx_status_8023);
1292
1293 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1294 {
1295         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1296         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1297                                     num_packets, GFP_ATOMIC);
1298 }
1299 EXPORT_SYMBOL(ieee80211_report_low_ack);
1300
1301 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1302 {
1303         struct ieee80211_local *local = hw_to_local(hw);
1304
1305         ieee80211_report_used_skb(local, skb, true);
1306         dev_kfree_skb_any(skb);
1307 }
1308 EXPORT_SYMBOL(ieee80211_free_txskb);
1309
1310 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1311                               struct sk_buff_head *skbs)
1312 {
1313         struct sk_buff *skb;
1314
1315         while ((skb = __skb_dequeue(skbs)))
1316                 ieee80211_free_txskb(hw, skb);
1317 }