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  * Copyright 2021-2022  Intel Corporation
   9  */
  10
  11 #include <linux/export.h>
  12 #include <linux/etherdevice.h>
  13 #include <net/mac80211.h>
  14 #include <asm/unaligned.h>
  15 #include "ieee80211_i.h"
  16 #include "rate.h"
  17 #include "mesh.h"
  18 #include "led.h"
  19 #include "wme.h"
  20
  21
  22 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  23                                  struct sk_buff *skb)
  24 {
  25         struct ieee80211_local *local = hw_to_local(hw);
  26         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  27         int tmp;
  28
  29         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  30         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  31                        &local->skb_queue : &local->skb_queue_unreliable, skb);
  32         tmp = skb_queue_len(&local->skb_queue) +
  33                 skb_queue_len(&local->skb_queue_unreliable);
  34         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  35                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  36                 ieee80211_free_txskb(hw, skb);
  37                 tmp--;
  38                 I802_DEBUG_INC(local->tx_status_drop);
  39         }
  40         tasklet_schedule(&local->tasklet);
  41 }
  42 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  43
  44 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  45                                             struct sta_info *sta,
  46                                             struct sk_buff *skb)
  47 {
  48         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  49         struct ieee80211_hdr *hdr = (void *)skb->data;
  50         int ac;
  51
  52         if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
  53                            IEEE80211_TX_CTL_AMPDU |
  54                            IEEE80211_TX_CTL_HW_80211_ENCAP)) {
  55                 ieee80211_free_txskb(&local->hw, skb);
  56                 return;
  57         }
  58
  59         /*
  60          * This skb 'survived' a round-trip through the driver, and
  61          * hopefully the driver didn't mangle it too badly. However,
  62          * we can definitely not rely on the control information
  63          * being correct. Clear it so we don't get junk there, and
  64          * indicate that it needs new processing, but must not be
  65          * modified/encrypted again.
  66          */
  67         memset(&info->control, 0, sizeof(info->control));
  68
  69         info->control.jiffies = jiffies;
  70         info->control.vif = &sta->sdata->vif;
  71         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
  72         info->flags |= IEEE80211_TX_INTFL_RETRANSMISSION;
  73         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  74
  75         sta->deflink.status_stats.filtered++;
  76
  77         /*
  78          * Clear more-data bit on filtered frames, it might be set
  79          * but later frames might time out so it might have to be
  80          * clear again ... It's all rather unlikely (this frame
  81          * should time out first, right?) but let's not confuse
  82          * peers unnecessarily.
  83          */
  84         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
  85                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  86
  87         if (ieee80211_is_data_qos(hdr->frame_control)) {
  88                 u8 *p = ieee80211_get_qos_ctl(hdr);
  89                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
  90
  91                 /*
  92                  * Clear EOSP if set, this could happen e.g.
  93                  * if an absence period (us being a P2P GO)
  94                  * shortens the SP.
  95                  */
  96                 if (*p & IEEE80211_QOS_CTL_EOSP)
  97                         *p &= ~IEEE80211_QOS_CTL_EOSP;
  98                 ac = ieee80211_ac_from_tid(tid);
  99         } else {
 100                 ac = IEEE80211_AC_BE;
 101         }
 102
 103         /*
 104          * Clear the TX filter mask for this STA when sending the next
 105          * packet. If the STA went to power save mode, this will happen
 106          * when it wakes up for the next time.
 107          */
 108         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
 109         ieee80211_clear_fast_xmit(sta);
 110
 111         /*
 112          * This code races in the following way:
 113          *
 114          *  (1) STA sends frame indicating it will go to sleep and does so
 115          *  (2) hardware/firmware adds STA to filter list, passes frame up
 116          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 117          *  (4) we get TX status before having processed the frame and
 118          *      knowing that the STA has gone to sleep.
 119          *
 120          * This is actually quite unlikely even when both those events are
 121          * processed from interrupts coming in quickly after one another or
 122          * even at the same time because we queue both TX status events and
 123          * RX frames to be processed by a tasklet and process them in the
 124          * same order that they were received or TX status last. Hence, there
 125          * is no race as long as the frame RX is processed before the next TX
 126          * status, which drivers can ensure, see below.
 127          *
 128          * Note that this can only happen if the hardware or firmware can
 129          * actually add STAs to the filter list, if this is done by the
 130          * driver in response to set_tim() (which will only reduce the race
 131          * this whole filtering tries to solve, not completely solve it)
 132          * this situation cannot happen.
 133          *
 134          * To completely solve this race drivers need to make sure that they
 135          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
 136          *      functions and
 137          *  (b) always process RX events before TX status events if ordering
 138          *      can be unknown, for example with different interrupt status
 139          *      bits.
 140          *  (c) if PS mode transitions are manual (i.e. the flag
 141          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
 142          *      changes before calling TX status events if ordering can be
 143          *      unknown.
 144          */
 145         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
 146             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
 147                 skb_queue_tail(&sta->tx_filtered[ac], skb);
 148                 sta_info_recalc_tim(sta);
 149
 150                 if (!timer_pending(&local->sta_cleanup))
 151                         mod_timer(&local->sta_cleanup,
 152                                   round_jiffies(jiffies +
 153                                                 STA_INFO_CLEANUP_INTERVAL));
 154                 return;
 155         }
 156
 157         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
 158             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
 159                 /* Software retry the packet once */
 160                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
 161                 ieee80211_add_pending_skb(local, skb);
 162                 return;
 163         }
 164
 165         ps_dbg_ratelimited(sta->sdata,
 166                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
 167                            skb_queue_len(&sta->tx_filtered[ac]),
 168                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
 169         ieee80211_free_txskb(&local->hw, skb);
 170 }
 171
 172 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
 173 {
 174         struct tid_ampdu_tx *tid_tx;
 175
 176         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 177         if (!tid_tx || !tid_tx->bar_pending)
 178                 return;
 179
 180         tid_tx->bar_pending = false;
 181         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
 182 }
 183
 184 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
 185 {
 186         struct ieee80211_mgmt *mgmt = (void *) skb->data;
 187         struct ieee80211_local *local = sta->local;
 188         struct ieee80211_sub_if_data *sdata = sta->sdata;
 189
 190         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 191                 struct ieee80211_hdr *hdr = (void *) skb->data;
 192                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 193                 u16 tid = qc[0] & 0xf;
 194
 195                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 196         }
 197
 198         if (ieee80211_is_action(mgmt->frame_control) &&
 199             !ieee80211_has_protected(mgmt->frame_control) &&
 200             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 201             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 202             ieee80211_sdata_running(sdata)) {
 203                 enum ieee80211_smps_mode smps_mode;
 204
 205                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 206                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 207                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 208                         break;
 209                 case WLAN_HT_SMPS_CONTROL_STATIC:
 210                         smps_mode = IEEE80211_SMPS_STATIC;
 211                         break;
 212                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 213                 default: /* shouldn't happen since we don't send that */
 214                         smps_mode = IEEE80211_SMPS_OFF;
 215                         break;
 216                 }
 217
 218                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 219                         /*
 220                          * This update looks racy, but isn't -- if we come
 221                          * here we've definitely got a station that we're
 222                          * talking to, and on a managed interface that can
 223                          * only be the AP. And the only other place updating
 224                          * this variable in managed mode is before association.
 225                          */
 226                         sdata->deflink.smps_mode = smps_mode;
 227                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 228                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 229                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 230                         sta->known_smps_mode = smps_mode;
 231                 }
 232         }
 233 }
 234
 235 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 236 {
 237         struct tid_ampdu_tx *tid_tx;
 238
 239         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 240         if (!tid_tx)
 241                 return;
 242
 243         tid_tx->failed_bar_ssn = ssn;
 244         tid_tx->bar_pending = true;
 245 }
 246
 247 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info,
 248                                      struct ieee80211_tx_status *status)
 249 {
 250         struct ieee80211_rate_status *status_rate = NULL;
 251         int len = sizeof(struct ieee80211_radiotap_header);
 252
 253         if (status && status->n_rates)
 254                 status_rate = &status->rates[status->n_rates - 1];
 255
 256         /* IEEE80211_RADIOTAP_RATE rate */
 257         if (status_rate && !(status_rate->rate_idx.flags &
 258                                                 (RATE_INFO_FLAGS_MCS |
 259                                                  RATE_INFO_FLAGS_DMG |
 260                                                  RATE_INFO_FLAGS_EDMG |
 261                                                  RATE_INFO_FLAGS_VHT_MCS |
 262                                                  RATE_INFO_FLAGS_HE_MCS)))
 263                 len += 2;
 264         else if (info->status.rates[0].idx >= 0 &&
 265                  !(info->status.rates[0].flags &
 266                    (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)))
 267                 len += 2;
 268
 269         /* IEEE80211_RADIOTAP_TX_FLAGS */
 270         len += 2;
 271
 272         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 273         len += 1;
 274
 275         /* IEEE80211_RADIOTAP_MCS
 276          * IEEE80211_RADIOTAP_VHT */
 277         if (status_rate) {
 278                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS)
 279                         len += 3;
 280                 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_VHT_MCS)
 281                         len = ALIGN(len, 2) + 12;
 282                 else if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_HE_MCS)
 283                         len = ALIGN(len, 2) + 12;
 284         } else if (info->status.rates[0].idx >= 0) {
 285                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 286                         len += 3;
 287                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 288                         len = ALIGN(len, 2) + 12;
 289         }
 290
 291         return len;
 292 }
 293
 294 static void
 295 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 296                                  struct sk_buff *skb, int retry_count,
 297                                  int rtap_len, int shift,
 298                                  struct ieee80211_tx_status *status)
 299 {
 300         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 301         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 302         struct ieee80211_radiotap_header *rthdr;
 303         struct ieee80211_rate_status *status_rate = NULL;
 304         unsigned char *pos;
 305         u16 legacy_rate = 0;
 306         u16 txflags;
 307
 308         if (status && status->n_rates)
 309                 status_rate = &status->rates[status->n_rates - 1];
 310
 311         rthdr = skb_push(skb, rtap_len);
 312
 313         memset(rthdr, 0, rtap_len);
 314         rthdr->it_len = cpu_to_le16(rtap_len);
 315         rthdr->it_present =
 316                 cpu_to_le32(BIT(IEEE80211_RADIOTAP_TX_FLAGS) |
 317                             BIT(IEEE80211_RADIOTAP_DATA_RETRIES));
 318         pos = (unsigned char *)(rthdr + 1);
 319
 320         /*
 321          * XXX: Once radiotap gets the bitmap reset thing the vendor
 322          *      extensions proposal contains, we can actually report
 323          *      the whole set of tries we did.
 324          */
 325
 326         /* IEEE80211_RADIOTAP_RATE */
 327
 328         if (status_rate) {
 329                 if (!(status_rate->rate_idx.flags &
 330                                                 (RATE_INFO_FLAGS_MCS |
 331                                                  RATE_INFO_FLAGS_DMG |
 332                                                  RATE_INFO_FLAGS_EDMG |
 333                                                  RATE_INFO_FLAGS_VHT_MCS |
 334                                                  RATE_INFO_FLAGS_HE_MCS)))
 335                         legacy_rate = status_rate->rate_idx.legacy;
 336         } else if (info->status.rates[0].idx >= 0 &&
 337                  !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 338                                                   IEEE80211_TX_RC_VHT_MCS))) {
 339                 struct ieee80211_supported_band *sband;
 340
 341                 sband = local->hw.wiphy->bands[info->band];
 342                 legacy_rate =
 343                         sband->bitrates[info->status.rates[0].idx].bitrate;
 344         }
 345
 346         if (legacy_rate) {
 347                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_RATE));
 348                 *pos = DIV_ROUND_UP(legacy_rate, 5 * (1 << shift));
 349                 /* padding for tx flags */
 350                 pos += 2;
 351         }
 352
 353         /* IEEE80211_RADIOTAP_TX_FLAGS */
 354         txflags = 0;
 355         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 356             !is_multicast_ether_addr(hdr->addr1))
 357                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 358
 359         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 360                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 361         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 362                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 363
 364         put_unaligned_le16(txflags, pos);
 365         pos += 2;
 366
 367         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 368         /* for now report the total retry_count */
 369         *pos = retry_count;
 370         pos++;
 371
 372         if (status_rate && (status_rate->rate_idx.flags & RATE_INFO_FLAGS_MCS))
 373         {
 374                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 375                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 376                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 377                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 378                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
 379                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 380                 if (status_rate->rate_idx.bw == RATE_INFO_BW_40)
 381                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 382                 pos[2] = status_rate->rate_idx.mcs;
 383                 pos += 3;
 384         } else if (status_rate && (status_rate->rate_idx.flags &
 385                                         RATE_INFO_FLAGS_VHT_MCS))
 386         {
 387                 u16 known = local->hw.radiotap_vht_details &
 388                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 389                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 390
 391                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 392
 393                 /* required alignment from rthdr */
 394                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 395
 396                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 397                 put_unaligned_le16(known, pos);
 398                 pos += 2;
 399
 400                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 401                 if (status_rate->rate_idx.flags & RATE_INFO_FLAGS_SHORT_GI)
 402                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 403                 pos++;
 404
 405                 /* u8 bandwidth */
 406                 switch (status_rate->rate_idx.bw) {
 407                 case RATE_INFO_BW_160:
 408                         *pos = 11;
 409                         break;
 410                 case RATE_INFO_BW_80:
 411                         *pos = 4;
 412                         break;
 413                 case RATE_INFO_BW_40:
 414                         *pos = 1;
 415                         break;
 416                 default:
 417                         *pos = 0;
 418                         break;
 419                 }
 420                 pos++;
 421
 422                 /* u8 mcs_nss[4] */
 423                 *pos = (status_rate->rate_idx.mcs << 4) |
 424                                 status_rate->rate_idx.nss;
 425                 pos += 4;
 426
 427                 /* u8 coding */
 428                 pos++;
 429                 /* u8 group_id */
 430                 pos++;
 431                 /* u16 partial_aid */
 432                 pos += 2;
 433         } else if (status_rate && (status_rate->rate_idx.flags &
 434                                         RATE_INFO_FLAGS_HE_MCS))
 435         {
 436                 struct ieee80211_radiotap_he *he;
 437
 438                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_HE));
 439
 440                 /* required alignment from rthdr */
 441                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 442                 he = (struct ieee80211_radiotap_he *)pos;
 443
 444                 he->data1 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA1_FORMAT_SU |
 445                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_MCS_KNOWN |
 446                                         IEEE80211_RADIOTAP_HE_DATA1_DATA_DCM_KNOWN |
 447                                         IEEE80211_RADIOTAP_HE_DATA1_BW_RU_ALLOC_KNOWN);
 448
 449                 he->data2 = cpu_to_le16(IEEE80211_RADIOTAP_HE_DATA2_GI_KNOWN);
 450
 451 #define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f)
 452
 453                 he->data6 |= HE_PREP(DATA6_NSTS, status_rate->rate_idx.nss);
 454
 455 #define CHECK_GI(s) \
 456         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \
 457         (int)NL80211_RATE_INFO_HE_GI_##s)
 458
 459                 CHECK_GI(0_8);
 460                 CHECK_GI(1_6);
 461                 CHECK_GI(3_2);
 462
 463                 he->data3 |= HE_PREP(DATA3_DATA_MCS, status_rate->rate_idx.mcs);
 464                 he->data3 |= HE_PREP(DATA3_DATA_DCM, status_rate->rate_idx.he_dcm);
 465
 466                 he->data5 |= HE_PREP(DATA5_GI, status_rate->rate_idx.he_gi);
 467
 468                 switch (status_rate->rate_idx.bw) {
 469                 case RATE_INFO_BW_20:
 470                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 471                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ);
 472                         break;
 473                 case RATE_INFO_BW_40:
 474                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 475                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ);
 476                         break;
 477                 case RATE_INFO_BW_80:
 478                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 479                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ);
 480                         break;
 481                 case RATE_INFO_BW_160:
 482                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 483                                              IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ);
 484                         break;
 485                 case RATE_INFO_BW_HE_RU:
 486 #define CHECK_RU_ALLOC(s) \
 487         BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \
 488         NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4)
 489
 490                         CHECK_RU_ALLOC(26);
 491                         CHECK_RU_ALLOC(52);
 492                         CHECK_RU_ALLOC(106);
 493                         CHECK_RU_ALLOC(242);
 494                         CHECK_RU_ALLOC(484);
 495                         CHECK_RU_ALLOC(996);
 496                         CHECK_RU_ALLOC(2x996);
 497
 498                         he->data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC,
 499                                              status_rate->rate_idx.he_ru_alloc + 4);
 500                         break;
 501                 default:
 502                         WARN_ONCE(1, "Invalid SU BW %d\n", status_rate->rate_idx.bw);
 503                 }
 504
 505                 pos += sizeof(struct ieee80211_radiotap_he);
 506         }
 507
 508         if (status_rate || info->status.rates[0].idx < 0)
 509                 return;
 510
 511         /* IEEE80211_RADIOTAP_MCS
 512          * IEEE80211_RADIOTAP_VHT */
 513         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 514                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_MCS));
 515                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 516                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 517                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 518                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 519                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 520                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 521                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 522                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 523                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 524                 pos[2] = info->status.rates[0].idx;
 525                 pos += 3;
 526         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 527                 u16 known = local->hw.radiotap_vht_details &
 528                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 529                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 530
 531                 rthdr->it_present |= cpu_to_le32(BIT(IEEE80211_RADIOTAP_VHT));
 532
 533                 /* required alignment from rthdr */
 534                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 535
 536                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 537                 put_unaligned_le16(known, pos);
 538                 pos += 2;
 539
 540                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 541                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 542                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 543                 pos++;
 544
 545                 /* u8 bandwidth */
 546                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 547                         *pos = 1;
 548                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 549                         *pos = 4;
 550                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 551                         *pos = 11;
 552                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 553                         *pos = 0;
 554                 pos++;
 555
 556                 /* u8 mcs_nss[4] */
 557                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 558                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 559                 pos += 4;
 560
 561                 /* u8 coding */
 562                 pos++;
 563                 /* u8 group_id */
 564                 pos++;
 565                 /* u16 partial_aid */
 566                 pos += 2;
 567         }
 568 }
 569
 570 /*
 571  * Handles the tx for TDLS teardown frames.
 572  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 573  */
 574 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 575                                         struct ieee80211_sub_if_data *sdata,
 576                                         struct sk_buff *skb, u32 flags)
 577 {
 578         struct sk_buff *teardown_skb;
 579         struct sk_buff *orig_teardown_skb;
 580         bool is_teardown = false;
 581
 582         /* Get the teardown data we need and free the lock */
 583         spin_lock(&sdata->u.mgd.teardown_lock);
 584         teardown_skb = sdata->u.mgd.teardown_skb;
 585         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 586         if ((skb == orig_teardown_skb) && teardown_skb) {
 587                 sdata->u.mgd.teardown_skb = NULL;
 588                 sdata->u.mgd.orig_teardown_skb = NULL;
 589                 is_teardown = true;
 590         }
 591         spin_unlock(&sdata->u.mgd.teardown_lock);
 592
 593         if (is_teardown) {
 594                 /* This mechanism relies on being able to get ACKs */
 595                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 596
 597                 /* Check if peer has ACKed */
 598                 if (flags & IEEE80211_TX_STAT_ACK) {
 599                         dev_kfree_skb_any(teardown_skb);
 600                 } else {
 601                         tdls_dbg(sdata,
 602                                  "TDLS Resending teardown through AP\n");
 603
 604                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 605                 }
 606         }
 607 }
 608
 609 static struct ieee80211_sub_if_data *
 610 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 611 {
 612         struct ieee80211_sub_if_data *sdata;
 613
 614         if (skb->dev) {
 615                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 616                         if (!sdata->dev)
 617                                 continue;
 618
 619                         if (skb->dev == sdata->dev)
 620                                 return sdata;
 621                 }
 622
 623                 return NULL;
 624         }
 625
 626         return rcu_dereference(local->p2p_sdata);
 627 }
 628
 629 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 630                                      struct ieee80211_tx_info *info,
 631                                      bool acked, bool dropped)
 632 {
 633         struct sk_buff *skb;
 634         unsigned long flags;
 635
 636         spin_lock_irqsave(&local->ack_status_lock, flags);
 637         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 638         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 639
 640         if (!skb)
 641                 return;
 642
 643         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 644                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 645                 struct ieee80211_sub_if_data *sdata;
 646                 struct ieee80211_hdr *hdr = (void *)skb->data;
 647                 bool is_valid_ack_signal =
 648                         !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
 649
 650                 rcu_read_lock();
 651                 sdata = ieee80211_sdata_from_skb(local, skb);
 652                 if (sdata) {
 653                         if (skb->protocol == sdata->control_port_protocol ||
 654                             skb->protocol == cpu_to_be16(ETH_P_PREAUTH))
 655                                 cfg80211_control_port_tx_status(&sdata->wdev,
 656                                                                 cookie,
 657                                                                 skb->data,
 658                                                                 skb->len,
 659                                                                 acked,
 660                                                                 GFP_ATOMIC);
 661                         else if (ieee80211_is_any_nullfunc(hdr->frame_control))
 662                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 663                                                       cookie, acked,
 664                                                       info->status.ack_signal,
 665                                                       is_valid_ack_signal,
 666                                                       GFP_ATOMIC);
 667                         else if (ieee80211_is_mgmt(hdr->frame_control))
 668                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 669                                                         skb->data, skb->len,
 670                                                         acked, GFP_ATOMIC);
 671                         else
 672                                 pr_warn("Unknown status report in ack skb\n");
 673
 674                 }
 675                 rcu_read_unlock();
 676
 677                 dev_kfree_skb_any(skb);
 678         } else if (dropped) {
 679                 dev_kfree_skb_any(skb);
 680         } else {
 681                 /* consumes skb */
 682                 skb_complete_wifi_ack(skb, acked);
 683         }
 684 }
 685
 686 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 687                                       struct sk_buff *skb, bool dropped)
 688 {
 689         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 690         u16 tx_time_est = ieee80211_info_get_tx_time_est(info);
 691         struct ieee80211_hdr *hdr = (void *)skb->data;
 692         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 693
 694         if (dropped)
 695                 acked = false;
 696
 697         if (tx_time_est) {
 698                 struct sta_info *sta;
 699
 700                 rcu_read_lock();
 701
 702                 sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
 703                 ieee80211_sta_update_pending_airtime(local, sta,
 704                                                      skb_get_queue_mapping(skb),
 705                                                      tx_time_est,
 706                                                      true);
 707                 rcu_read_unlock();
 708         }
 709
 710         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 711                 struct ieee80211_sub_if_data *sdata;
 712
 713                 rcu_read_lock();
 714
 715                 sdata = ieee80211_sdata_from_skb(local, skb);
 716
 717                 if (!sdata) {
 718                         skb->dev = NULL;
 719                 } else {
 720                         unsigned int hdr_size =
 721                                 ieee80211_hdrlen(hdr->frame_control);
 722
 723                         /* Check to see if packet is a TDLS teardown packet */
 724                         if (ieee80211_is_data(hdr->frame_control) &&
 725                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 726                              WLAN_TDLS_TEARDOWN)) {
 727                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 728                                                             info->flags);
 729                         } else if (ieee80211_s1g_is_twt_setup(skb)) {
 730                                 if (!acked) {
 731                                         struct sk_buff *qskb;
 732
 733                                         qskb = skb_clone(skb, GFP_ATOMIC);
 734                                         if (qskb) {
 735                                                 skb_queue_tail(&sdata->status_queue,
 736                                                                qskb);
 737                                                 ieee80211_queue_work(&local->hw,
 738                                                                      &sdata->work);
 739                                         }
 740                                 }
 741                         } else {
 742                                 ieee80211_mgd_conn_tx_status(sdata,
 743                                                              hdr->frame_control,
 744                                                              acked);
 745                         }
 746                 }
 747
 748                 rcu_read_unlock();
 749         } else if (info->ack_frame_id) {
 750                 ieee80211_report_ack_skb(local, info, acked, dropped);
 751         }
 752
 753         if (!dropped && skb->destructor) {
 754                 skb->wifi_acked_valid = 1;
 755                 skb->wifi_acked = acked;
 756         }
 757
 758         ieee80211_led_tx(local);
 759
 760         if (skb_has_frag_list(skb)) {
 761                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 762                 skb_shinfo(skb)->frag_list = NULL;
 763         }
 764 }
 765
 766 /*
 767  * Use a static threshold for now, best value to be determined
 768  * by testing ...
 769  * Should it depend on:
 770  *  - on # of retransmissions
 771  *  - current throughput (higher value for higher tpt)?
 772  */
 773 #define STA_LOST_PKT_THRESHOLD  50
 774 #define STA_LOST_PKT_TIME       HZ              /* 1 sec since last ACK */
 775 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 776
 777 static void ieee80211_lost_packet(struct sta_info *sta,
 778                                   struct ieee80211_tx_info *info)
 779 {
 780         unsigned long pkt_time = STA_LOST_PKT_TIME;
 781         unsigned int pkt_thr = STA_LOST_PKT_THRESHOLD;
 782
 783         /* If driver relies on its own algorithm for station kickout, skip
 784          * mac80211 packet loss mechanism.
 785          */
 786         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 787                 return;
 788
 789         /* This packet was aggregated but doesn't carry status info */
 790         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 791             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 792                 return;
 793
 794         sta->deflink.status_stats.lost_packets++;
 795         if (sta->sta.tdls) {
 796                 pkt_time = STA_LOST_TDLS_PKT_TIME;
 797                 pkt_thr = STA_LOST_PKT_THRESHOLD;
 798         }
 799
 800         /*
 801          * If we're in TDLS mode, make sure that all STA_LOST_PKT_THRESHOLD
 802          * of the last packets were lost, and that no ACK was received in the
 803          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 804          * mechanism.
 805          * For non-TDLS, use STA_LOST_PKT_THRESHOLD and STA_LOST_PKT_TIME
 806          */
 807         if (sta->deflink.status_stats.lost_packets < pkt_thr ||
 808             !time_after(jiffies, sta->deflink.status_stats.last_pkt_time + pkt_time))
 809                 return;
 810
 811         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 812                                     sta->deflink.status_stats.lost_packets,
 813                                     GFP_ATOMIC);
 814         sta->deflink.status_stats.lost_packets = 0;
 815 }
 816
 817 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 818                                   struct ieee80211_tx_info *info,
 819                                   int *retry_count)
 820 {
 821         int count = -1;
 822         int i;
 823
 824         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 825                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 826                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 827                         /* just the first aggr frame carry status info */
 828                         info->status.rates[i].idx = -1;
 829                         info->status.rates[i].count = 0;
 830                         break;
 831                 } else if (info->status.rates[i].idx < 0) {
 832                         break;
 833                 } else if (i >= hw->max_report_rates) {
 834                         /* the HW cannot have attempted that rate */
 835                         info->status.rates[i].idx = -1;
 836                         info->status.rates[i].count = 0;
 837                         break;
 838                 }
 839
 840                 count += info->status.rates[i].count;
 841         }
 842
 843         if (count < 0)
 844                 count = 0;
 845
 846         *retry_count = count;
 847         return i - 1;
 848 }
 849
 850 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 851                           int retry_count, int shift, bool send_to_cooked,
 852                           struct ieee80211_tx_status *status)
 853 {
 854         struct sk_buff *skb2;
 855         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 856         struct ieee80211_sub_if_data *sdata;
 857         struct net_device *prev_dev = NULL;
 858         int rtap_len;
 859
 860         /* send frame to monitor interfaces now */
 861         rtap_len = ieee80211_tx_radiotap_len(info, status);
 862         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 863                 pr_err("ieee80211_tx_status: headroom too small\n");
 864                 dev_kfree_skb(skb);
 865                 return;
 866         }
 867         ieee80211_add_tx_radiotap_header(local, skb, retry_count,
 868                                          rtap_len, shift, status);
 869
 870         /* XXX: is this sufficient for BPF? */
 871         skb_reset_mac_header(skb);
 872         skb->ip_summed = CHECKSUM_UNNECESSARY;
 873         skb->pkt_type = PACKET_OTHERHOST;
 874         skb->protocol = htons(ETH_P_802_2);
 875         memset(skb->cb, 0, sizeof(skb->cb));
 876
 877         rcu_read_lock();
 878         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 879                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 880                         if (!ieee80211_sdata_running(sdata))
 881                                 continue;
 882
 883                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 884                             !send_to_cooked)
 885                                 continue;
 886
 887                         if (prev_dev) {
 888                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 889                                 if (skb2) {
 890                                         skb2->dev = prev_dev;
 891                                         netif_rx(skb2);
 892                                 }
 893                         }
 894
 895                         prev_dev = sdata->dev;
 896                 }
 897         }
 898         if (prev_dev) {
 899                 skb->dev = prev_dev;
 900                 netif_rx(skb);
 901                 skb = NULL;
 902         }
 903         rcu_read_unlock();
 904         dev_kfree_skb(skb);
 905 }
 906
 907 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 908                                   struct ieee80211_tx_status *status,
 909                                   int rates_idx, int retry_count)
 910 {
 911         struct sk_buff *skb = status->skb;
 912         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 913         struct ieee80211_local *local = hw_to_local(hw);
 914         struct ieee80211_tx_info *info = status->info;
 915         struct sta_info *sta;
 916         __le16 fc;
 917         bool send_to_cooked;
 918         bool acked;
 919         bool noack_success;
 920         struct ieee80211_bar *bar;
 921         int shift = 0;
 922         int tid = IEEE80211_NUM_TIDS;
 923
 924         fc = hdr->frame_control;
 925
 926         if (status->sta) {
 927                 sta = container_of(status->sta, struct sta_info, sta);
 928                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 929
 930                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 931                         clear_sta_flag(sta, WLAN_STA_SP);
 932
 933                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 934                 noack_success = !!(info->flags &
 935                                    IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 936
 937                 /* mesh Peer Service Period support */
 938                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 939                     ieee80211_is_data_qos(fc))
 940                         ieee80211_mpsp_trigger_process(
 941                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 942
 943                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 944                     (ieee80211_is_data(hdr->frame_control)) &&
 945                     (rates_idx != -1))
 946                         sta->deflink.tx_stats.last_rate =
 947                                 info->status.rates[rates_idx];
 948
 949                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 950                     (ieee80211_is_data_qos(fc))) {
 951                         u16 ssn;
 952                         u8 *qc;
 953
 954                         qc = ieee80211_get_qos_ctl(hdr);
 955                         tid = qc[0] & 0xf;
 956                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 957                                                 & IEEE80211_SCTL_SEQ);
 958                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 959                                            tid, ssn);
 960                 } else if (ieee80211_is_data_qos(fc)) {
 961                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 962
 963                         tid = qc[0] & 0xf;
 964                 }
 965
 966                 if (!acked && ieee80211_is_back_req(fc)) {
 967                         u16 control;
 968
 969                         /*
 970                          * BAR failed, store the last SSN and retry sending
 971                          * the BAR when the next unicast transmission on the
 972                          * same TID succeeds.
 973                          */
 974                         bar = (struct ieee80211_bar *) skb->data;
 975                         control = le16_to_cpu(bar->control);
 976                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 977                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 978
 979                                 tid = (control &
 980                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 981                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 982
 983                                 ieee80211_set_bar_pending(sta, tid, ssn);
 984                         }
 985                 }
 986
 987                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 988                         ieee80211_handle_filtered_frame(local, sta, skb);
 989                         return;
 990                 } else if (ieee80211_is_data_present(fc)) {
 991                         if (!acked && !noack_success)
 992                                 sta->deflink.status_stats.msdu_failed[tid]++;
 993
 994                         sta->deflink.status_stats.msdu_retries[tid] +=
 995                                 retry_count;
 996                 }
 997
 998                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 999                         ieee80211_frame_acked(sta, skb);
1000
1001         }
1002
1003         /* SNMP counters
1004          * Fragments are passed to low-level drivers as separate skbs, so these
1005          * are actually fragments, not frames. Update frame counters only for
1006          * the first fragment of the frame. */
1007         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
1008             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
1009                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
1010                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1011                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
1012                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1013                         if (retry_count > 0)
1014                                 I802_DEBUG_INC(local->dot11RetryCount);
1015                         if (retry_count > 1)
1016                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
1017                 }
1018
1019                 /* This counter shall be incremented for an acknowledged MPDU
1020                  * with an individual address in the address 1 field or an MPDU
1021                  * with a multicast address in the address 1 field of type Data
1022                  * or Management. */
1023                 if (!is_multicast_ether_addr(hdr->addr1) ||
1024                     ieee80211_is_data(fc) ||
1025                     ieee80211_is_mgmt(fc))
1026                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
1027         } else {
1028                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
1029                         I802_DEBUG_INC(local->dot11FailedCount);
1030         }
1031
1032         if (ieee80211_is_any_nullfunc(fc) &&
1033             ieee80211_has_pm(fc) &&
1034             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
1035             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
1036             local->ps_sdata && !(local->scanning)) {
1037                 if (info->flags & IEEE80211_TX_STAT_ACK)
1038                         local->ps_sdata->u.mgd.flags |=
1039                                         IEEE80211_STA_NULLFUNC_ACKED;
1040                 mod_timer(&local->dynamic_ps_timer,
1041                           jiffies + msecs_to_jiffies(10));
1042         }
1043
1044         ieee80211_report_used_skb(local, skb, false);
1045
1046         /* this was a transmitted frame, but now we want to reuse it */
1047         skb_orphan(skb);
1048
1049         /* Need to make a copy before skb->cb gets cleared */
1050         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
1051                          !(ieee80211_is_data(fc));
1052
1053         /*
1054          * This is a bit racy but we can avoid a lot of work
1055          * with this test...
1056          */
1057         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
1058                 if (status->free_list)
1059                         list_add_tail(&skb->list, status->free_list);
1060                 else
1061                         dev_kfree_skb(skb);
1062                 return;
1063         }
1064
1065         /* send to monitor interfaces */
1066         ieee80211_tx_monitor(local, skb, retry_count, shift,
1067                              send_to_cooked, status);
1068 }
1069
1070 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1071 {
1072         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1073         struct ieee80211_local *local = hw_to_local(hw);
1074         struct ieee80211_tx_status status = {
1075                 .skb = skb,
1076                 .info = IEEE80211_SKB_CB(skb),
1077         };
1078         struct sta_info *sta;
1079
1080         rcu_read_lock();
1081
1082         sta = sta_info_get_by_addrs(local, hdr->addr1, hdr->addr2);
1083         if (sta)
1084                 status.sta = &sta->sta;
1085
1086         ieee80211_tx_status_ext(hw, &status);
1087         rcu_read_unlock();
1088 }
1089 EXPORT_SYMBOL(ieee80211_tx_status);
1090
1091 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
1092                              struct ieee80211_tx_status *status)
1093 {
1094         struct ieee80211_local *local = hw_to_local(hw);
1095         struct ieee80211_tx_info *info = status->info;
1096         struct ieee80211_sta *pubsta = status->sta;
1097         struct sk_buff *skb = status->skb;
1098         struct sta_info *sta = NULL;
1099         int rates_idx, retry_count;
1100         bool acked, noack_success, ack_signal_valid;
1101         u16 tx_time_est;
1102
1103         if (pubsta) {
1104                 sta = container_of(pubsta, struct sta_info, sta);
1105
1106                 if (status->n_rates)
1107                         sta->deflink.tx_stats.last_rate_info =
1108                                 status->rates[status->n_rates - 1].rate_idx;
1109         }
1110
1111         if (skb && (tx_time_est =
1112                     ieee80211_info_get_tx_time_est(IEEE80211_SKB_CB(skb))) > 0) {
1113                 /* Do this here to avoid the expensive lookup of the sta
1114                  * in ieee80211_report_used_skb().
1115                  */
1116                 ieee80211_sta_update_pending_airtime(local, sta,
1117                                                      skb_get_queue_mapping(skb),
1118                                                      tx_time_est,
1119                                                      true);
1120                 ieee80211_info_set_tx_time_est(IEEE80211_SKB_CB(skb), 0);
1121         }
1122
1123         if (!status->info)
1124                 goto free;
1125
1126         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
1127
1128         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
1129         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
1130         ack_signal_valid =
1131                 !!(info->status.flags & IEEE80211_TX_STATUS_ACK_SIGNAL_VALID);
1132
1133         if (pubsta) {
1134                 struct ieee80211_sub_if_data *sdata = sta->sdata;
1135
1136                 if (!acked && !noack_success)
1137                         sta->deflink.status_stats.retry_failed++;
1138                 sta->deflink.status_stats.retry_count += retry_count;
1139
1140                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1141                         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1142                             skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1143                                 ieee80211_sta_tx_notify(sdata, (void *) skb->data,
1144                                                         acked, info->status.tx_time);
1145
1146                         if (acked) {
1147                                 sta->deflink.status_stats.last_ack = jiffies;
1148
1149                                 if (sta->deflink.status_stats.lost_packets)
1150                                         sta->deflink.status_stats.lost_packets = 0;
1151
1152                                 /* Track when last packet was ACKed */
1153                                 sta->deflink.status_stats.last_pkt_time = jiffies;
1154
1155                                 /* Reset connection monitor */
1156                                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1157                                     unlikely(sdata->u.mgd.probe_send_count > 0))
1158                                         sdata->u.mgd.probe_send_count = 0;
1159
1160                                 if (ack_signal_valid) {
1161                                         sta->deflink.status_stats.last_ack_signal =
1162                                                          (s8)info->status.ack_signal;
1163                                         sta->deflink.status_stats.ack_signal_filled = true;
1164                                         ewma_avg_signal_add(&sta->deflink.status_stats.avg_ack_signal,
1165                                                             -info->status.ack_signal);
1166                                 }
1167                         } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
1168                                 /*
1169                                  * The STA is in power save mode, so assume
1170                                  * that this TX packet failed because of that.
1171                                  */
1172                                 if (skb)
1173                                         ieee80211_handle_filtered_frame(local, sta, skb);
1174                                 return;
1175                         } else if (noack_success) {
1176                                 /* nothing to do here, do not account as lost */
1177                         } else {
1178                                 ieee80211_lost_packet(sta, info);
1179                         }
1180                 }
1181
1182                 rate_control_tx_status(local, status);
1183                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
1184                         ieee80211s_update_metric(local, sta, status);
1185         }
1186
1187         if (skb && !(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP))
1188                 return __ieee80211_tx_status(hw, status, rates_idx,
1189                                              retry_count);
1190
1191         if (acked || noack_success) {
1192                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
1193                 if (!pubsta)
1194                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
1195                 if (retry_count > 0)
1196                         I802_DEBUG_INC(local->dot11RetryCount);
1197                 if (retry_count > 1)
1198                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
1199         } else {
1200                 I802_DEBUG_INC(local->dot11FailedCount);
1201         }
1202
1203 free:
1204         if (!skb)
1205                 return;
1206
1207         ieee80211_report_used_skb(local, skb, false);
1208         if (status->free_list)
1209                 list_add_tail(&skb->list, status->free_list);
1210         else
1211                 dev_kfree_skb(skb);
1212 }
1213 EXPORT_SYMBOL(ieee80211_tx_status_ext);
1214
1215 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1216                               struct ieee80211_sta *pubsta,
1217                               struct ieee80211_tx_info *info)
1218 {
1219         struct ieee80211_local *local = hw_to_local(hw);
1220         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1221         struct ieee80211_tx_status status = {
1222                 .info = info,
1223                 .sta = pubsta,
1224         };
1225
1226         rate_control_tx_status(local, &status);
1227
1228         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1229                 sta->deflink.tx_stats.last_rate = info->status.rates[0];
1230 }
1231 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1232
1233 void ieee80211_tx_status_8023(struct ieee80211_hw *hw,
1234                               struct ieee80211_vif *vif,
1235                               struct sk_buff *skb)
1236 {
1237         struct ieee80211_sub_if_data *sdata;
1238         struct ieee80211_tx_status status = {
1239                 .skb = skb,
1240                 .info = IEEE80211_SKB_CB(skb),
1241         };
1242         struct sta_info *sta;
1243
1244         sdata = vif_to_sdata(vif);
1245
1246         rcu_read_lock();
1247
1248         if (!ieee80211_lookup_ra_sta(sdata, skb, &sta) && !IS_ERR(sta))
1249                 status.sta = &sta->sta;
1250
1251         ieee80211_tx_status_ext(hw, &status);
1252
1253         rcu_read_unlock();
1254 }
1255 EXPORT_SYMBOL(ieee80211_tx_status_8023);
1256
1257 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1258 {
1259         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1260         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1261                                     num_packets, GFP_ATOMIC);
1262 }
1263 EXPORT_SYMBOL(ieee80211_report_low_ack);
1264
1265 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1266 {
1267         struct ieee80211_local *local = hw_to_local(hw);
1268
1269         ieee80211_report_used_skb(local, skb, true);
1270         dev_kfree_skb_any(skb);
1271 }
1272 EXPORT_SYMBOL(ieee80211_free_txskb);
1273
1274 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1275                               struct sk_buff_head *skbs)
1276 {
1277         struct sk_buff *skb;
1278
1279         while ((skb = __skb_dequeue(skbs)))
1280                 ieee80211_free_txskb(hw, skb);
1281 }