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 {
 259         int len = sizeof(struct ieee80211_radiotap_header);
 260
 261         /* IEEE80211_RADIOTAP_RATE rate */
 262         if (info->status.rates[0].idx >= 0 &&
 263             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 264                                              IEEE80211_TX_RC_VHT_MCS)))
 265                 len += 2;
 266
 267         /* IEEE80211_RADIOTAP_TX_FLAGS */
 268         len += 2;
 269
 270         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 271         len += 1;
 272
 273         /* IEEE80211_RADIOTAP_MCS
 274          * IEEE80211_RADIOTAP_VHT */
 275         if (info->status.rates[0].idx >= 0) {
 276                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 277                         len += 3;
 278                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 279                         len = ALIGN(len, 2) + 12;
 280         }
 281
 282         return len;
 283 }
 284
 285 static void
 286 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 287                                  struct ieee80211_supported_band *sband,
 288                                  struct sk_buff *skb, int retry_count,
 289                                  int rtap_len, int shift)
 290 {
 291         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 292         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 293         struct ieee80211_radiotap_header *rthdr;
 294         unsigned char *pos;
 295         u16 txflags;
 296
 297         rthdr = skb_push(skb, rtap_len);
 298
 299         memset(rthdr, 0, rtap_len);
 300         rthdr->it_len = cpu_to_le16(rtap_len);
 301         rthdr->it_present =
 302                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 303                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 304         pos = (unsigned char *)(rthdr + 1);
 305
 306         /*
 307          * XXX: Once radiotap gets the bitmap reset thing the vendor
 308          *      extensions proposal contains, we can actually report
 309          *      the whole set of tries we did.
 310          */
 311
 312         /* IEEE80211_RADIOTAP_RATE */
 313         if (info->status.rates[0].idx >= 0 &&
 314             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 315                                              IEEE80211_TX_RC_VHT_MCS))) {
 316                 u16 rate;
 317
 318                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 319                 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
 320                 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
 321                 /* padding for tx flags */
 322                 pos += 2;
 323         }
 324
 325         /* IEEE80211_RADIOTAP_TX_FLAGS */
 326         txflags = 0;
 327         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 328             !is_multicast_ether_addr(hdr->addr1))
 329                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 330
 331         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 332                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 333         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 334                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 335
 336         put_unaligned_le16(txflags, pos);
 337         pos += 2;
 338
 339         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 340         /* for now report the total retry_count */
 341         *pos = retry_count;
 342         pos++;
 343
 344         if (info->status.rates[0].idx < 0)
 345                 return;
 346
 347         /* IEEE80211_RADIOTAP_MCS
 348          * IEEE80211_RADIOTAP_VHT */
 349         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 350                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 351                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 352                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 353                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 354                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 355                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 356                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 357                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 358                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 359                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 360                 pos[2] = info->status.rates[0].idx;
 361                 pos += 3;
 362         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 363                 u16 known = local->hw.radiotap_vht_details &
 364                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 365                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 366
 367                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 368
 369                 /* required alignment from rthdr */
 370                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 371
 372                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 373                 put_unaligned_le16(known, pos);
 374                 pos += 2;
 375
 376                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 377                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 378                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 379                 pos++;
 380
 381                 /* u8 bandwidth */
 382                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 383                         *pos = 1;
 384                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 385                         *pos = 4;
 386                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 387                         *pos = 11;
 388                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 389                         *pos = 0;
 390                 pos++;
 391
 392                 /* u8 mcs_nss[4] */
 393                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 394                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 395                 pos += 4;
 396
 397                 /* u8 coding */
 398                 pos++;
 399                 /* u8 group_id */
 400                 pos++;
 401                 /* u16 partial_aid */
 402                 pos += 2;
 403         }
 404 }
 405
 406 /*
 407  * Handles the tx for TDLS teardown frames.
 408  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 409  */
 410 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 411                                         struct ieee80211_sub_if_data *sdata,
 412                                         struct sk_buff *skb, u32 flags)
 413 {
 414         struct sk_buff *teardown_skb;
 415         struct sk_buff *orig_teardown_skb;
 416         bool is_teardown = false;
 417
 418         /* Get the teardown data we need and free the lock */
 419         spin_lock(&sdata->u.mgd.teardown_lock);
 420         teardown_skb = sdata->u.mgd.teardown_skb;
 421         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 422         if ((skb == orig_teardown_skb) && teardown_skb) {
 423                 sdata->u.mgd.teardown_skb = NULL;
 424                 sdata->u.mgd.orig_teardown_skb = NULL;
 425                 is_teardown = true;
 426         }
 427         spin_unlock(&sdata->u.mgd.teardown_lock);
 428
 429         if (is_teardown) {
 430                 /* This mechanism relies on being able to get ACKs */
 431                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 432
 433                 /* Check if peer has ACKed */
 434                 if (flags & IEEE80211_TX_STAT_ACK) {
 435                         dev_kfree_skb_any(teardown_skb);
 436                 } else {
 437                         tdls_dbg(sdata,
 438                                  "TDLS Resending teardown through AP\n");
 439
 440                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 441                 }
 442         }
 443 }
 444
 445 static struct ieee80211_sub_if_data *
 446 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 447 {
 448         struct ieee80211_sub_if_data *sdata;
 449
 450         if (skb->dev) {
 451                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 452                         if (!sdata->dev)
 453                                 continue;
 454
 455                         if (skb->dev == sdata->dev)
 456                                 return sdata;
 457                 }
 458
 459                 return NULL;
 460         }
 461
 462         return rcu_dereference(local->p2p_sdata);
 463 }
 464
 465 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 466                                      struct ieee80211_tx_info *info,
 467                                      bool acked, bool dropped)
 468 {
 469         struct sk_buff *skb;
 470         unsigned long flags;
 471
 472         spin_lock_irqsave(&local->ack_status_lock, flags);
 473         skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
 474         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 475
 476         if (!skb)
 477                 return;
 478
 479         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 480                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 481                 struct ieee80211_sub_if_data *sdata;
 482                 struct ieee80211_hdr *hdr = (void *)skb->data;
 483
 484                 rcu_read_lock();
 485                 sdata = ieee80211_sdata_from_skb(local, skb);
 486                 if (sdata) {
 487                         if (ieee80211_is_nullfunc(hdr->frame_control) ||
 488                             ieee80211_is_qos_nullfunc(hdr->frame_control))
 489                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 490                                                       cookie, acked,
 491                                                       info->status.ack_signal,
 492                                                       info->status.is_valid_ack_signal,
 493                                                       GFP_ATOMIC);
 494                         else
 495                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 496                                                         skb->data, skb->len,
 497                                                         acked, GFP_ATOMIC);
 498                 }
 499                 rcu_read_unlock();
 500
 501                 dev_kfree_skb_any(skb);
 502         } else if (dropped) {
 503                 dev_kfree_skb_any(skb);
 504         } else {
 505                 /* consumes skb */
 506                 skb_complete_wifi_ack(skb, acked);
 507         }
 508 }
 509
 510 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 511                                       struct sk_buff *skb, bool dropped)
 512 {
 513         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 514         struct ieee80211_hdr *hdr = (void *)skb->data;
 515         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 516
 517         if (dropped)
 518                 acked = false;
 519
 520         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 521                 struct ieee80211_sub_if_data *sdata;
 522
 523                 rcu_read_lock();
 524
 525                 sdata = ieee80211_sdata_from_skb(local, skb);
 526
 527                 if (!sdata) {
 528                         skb->dev = NULL;
 529                 } else {
 530                         unsigned int hdr_size =
 531                                 ieee80211_hdrlen(hdr->frame_control);
 532
 533                         /* Check to see if packet is a TDLS teardown packet */
 534                         if (ieee80211_is_data(hdr->frame_control) &&
 535                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 536                              WLAN_TDLS_TEARDOWN))
 537                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 538                                                             info->flags);
 539                         else
 540                                 ieee80211_mgd_conn_tx_status(sdata,
 541                                                              hdr->frame_control,
 542                                                              acked);
 543                 }
 544
 545                 rcu_read_unlock();
 546         } else if (info->ack_frame_id) {
 547                 ieee80211_report_ack_skb(local, info, acked, dropped);
 548         }
 549
 550         if (!dropped && skb->destructor) {
 551                 skb->wifi_acked_valid = 1;
 552                 skb->wifi_acked = acked;
 553         }
 554
 555         ieee80211_led_tx(local);
 556
 557         if (skb_has_frag_list(skb)) {
 558                 kfree_skb_list(skb_shinfo(skb)->frag_list);
 559                 skb_shinfo(skb)->frag_list = NULL;
 560         }
 561 }
 562
 563 /*
 564  * Use a static threshold for now, best value to be determined
 565  * by testing ...
 566  * Should it depend on:
 567  *  - on # of retransmissions
 568  *  - current throughput (higher value for higher tpt)?
 569  */
 570 #define STA_LOST_PKT_THRESHOLD  50
 571 #define STA_LOST_TDLS_PKT_THRESHOLD     10
 572 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 573
 574 static void ieee80211_lost_packet(struct sta_info *sta,
 575                                   struct ieee80211_tx_info *info)
 576 {
 577         /* If driver relies on its own algorithm for station kickout, skip
 578          * mac80211 packet loss mechanism.
 579          */
 580         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 581                 return;
 582
 583         /* This packet was aggregated but doesn't carry status info */
 584         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 585             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 586                 return;
 587
 588         sta->status_stats.lost_packets++;
 589         if (!sta->sta.tdls &&
 590             sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
 591                 return;
 592
 593         /*
 594          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 595          * of the last packets were lost, and that no ACK was received in the
 596          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 597          * mechanism.
 598          */
 599         if (sta->sta.tdls &&
 600             (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
 601              time_before(jiffies,
 602                          sta->status_stats.last_tdls_pkt_time +
 603                          STA_LOST_TDLS_PKT_TIME)))
 604                 return;
 605
 606         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 607                                     sta->status_stats.lost_packets, GFP_ATOMIC);
 608         sta->status_stats.lost_packets = 0;
 609 }
 610
 611 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 612                                   struct ieee80211_tx_info *info,
 613                                   int *retry_count)
 614 {
 615         int rates_idx = -1;
 616         int count = -1;
 617         int i;
 618
 619         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 620                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 621                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 622                         /* just the first aggr frame carry status info */
 623                         info->status.rates[i].idx = -1;
 624                         info->status.rates[i].count = 0;
 625                         break;
 626                 } else if (info->status.rates[i].idx < 0) {
 627                         break;
 628                 } else if (i >= hw->max_report_rates) {
 629                         /* the HW cannot have attempted that rate */
 630                         info->status.rates[i].idx = -1;
 631                         info->status.rates[i].count = 0;
 632                         break;
 633                 }
 634
 635                 count += info->status.rates[i].count;
 636         }
 637         rates_idx = i - 1;
 638
 639         if (count < 0)
 640                 count = 0;
 641
 642         *retry_count = count;
 643         return rates_idx;
 644 }
 645
 646 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 647                           struct ieee80211_supported_band *sband,
 648                           int retry_count, int shift, bool send_to_cooked)
 649 {
 650         struct sk_buff *skb2;
 651         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 652         struct ieee80211_sub_if_data *sdata;
 653         struct net_device *prev_dev = NULL;
 654         int rtap_len;
 655
 656         /* send frame to monitor interfaces now */
 657         rtap_len = ieee80211_tx_radiotap_len(info);
 658         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 659                 pr_err("ieee80211_tx_status: headroom too small\n");
 660                 dev_kfree_skb(skb);
 661                 return;
 662         }
 663         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 664                                          rtap_len, shift);
 665
 666         /* XXX: is this sufficient for BPF? */
 667         skb_reset_mac_header(skb);
 668         skb->ip_summed = CHECKSUM_UNNECESSARY;
 669         skb->pkt_type = PACKET_OTHERHOST;
 670         skb->protocol = htons(ETH_P_802_2);
 671         memset(skb->cb, 0, sizeof(skb->cb));
 672
 673         rcu_read_lock();
 674         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 675                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 676                         if (!ieee80211_sdata_running(sdata))
 677                                 continue;
 678
 679                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 680                             !send_to_cooked)
 681                                 continue;
 682
 683                         if (prev_dev) {
 684                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 685                                 if (skb2) {
 686                                         skb2->dev = prev_dev;
 687                                         netif_rx(skb2);
 688                                 }
 689                         }
 690
 691                         prev_dev = sdata->dev;
 692                 }
 693         }
 694         if (prev_dev) {
 695                 skb->dev = prev_dev;
 696                 netif_rx(skb);
 697                 skb = NULL;
 698         }
 699         rcu_read_unlock();
 700         dev_kfree_skb(skb);
 701 }
 702
 703 static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 704                                   struct ieee80211_tx_status *status)
 705 {
 706         struct sk_buff *skb = status->skb;
 707         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 708         struct ieee80211_local *local = hw_to_local(hw);
 709         struct ieee80211_tx_info *info = status->info;
 710         struct sta_info *sta;
 711         __le16 fc;
 712         struct ieee80211_supported_band *sband;
 713         int retry_count;
 714         int rates_idx;
 715         bool send_to_cooked;
 716         bool acked;
 717         struct ieee80211_bar *bar;
 718         int shift = 0;
 719         int tid = IEEE80211_NUM_TIDS;
 720
 721         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
 722
 723         sband = local->hw.wiphy->bands[info->band];
 724         fc = hdr->frame_control;
 725
 726         if (status->sta) {
 727                 sta = container_of(status->sta, struct sta_info, sta);
 728                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 729
 730                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 731                         clear_sta_flag(sta, WLAN_STA_SP);
 732
 733                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 734
 735                 /* mesh Peer Service Period support */
 736                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 737                     ieee80211_is_data_qos(fc))
 738                         ieee80211_mpsp_trigger_process(
 739                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 740
 741                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 742                         /*
 743                          * The STA is in power save mode, so assume
 744                          * that this TX packet failed because of that.
 745                          */
 746                         ieee80211_handle_filtered_frame(local, sta, skb);
 747                         return;
 748                 }
 749
 750                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 751                     (ieee80211_is_data(hdr->frame_control)) &&
 752                     (rates_idx != -1))
 753                         sta->tx_stats.last_rate =
 754                                 info->status.rates[rates_idx];
 755
 756                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 757                     (ieee80211_is_data_qos(fc))) {
 758                         u16 ssn;
 759                         u8 *qc;
 760
 761                         qc = ieee80211_get_qos_ctl(hdr);
 762                         tid = qc[0] & 0xf;
 763                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 764                                                 & IEEE80211_SCTL_SEQ);
 765                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 766                                            tid, ssn);
 767                 } else if (ieee80211_is_data_qos(fc)) {
 768                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 769
 770                         tid = qc[0] & 0xf;
 771                 }
 772
 773                 if (!acked && ieee80211_is_back_req(fc)) {
 774                         u16 control;
 775
 776                         /*
 777                          * BAR failed, store the last SSN and retry sending
 778                          * the BAR when the next unicast transmission on the
 779                          * same TID succeeds.
 780                          */
 781                         bar = (struct ieee80211_bar *) skb->data;
 782                         control = le16_to_cpu(bar->control);
 783                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 784                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 785
 786                                 tid = (control &
 787                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 788                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 789
 790                                 ieee80211_set_bar_pending(sta, tid, ssn);
 791                         }
 792                 }
 793
 794                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 795                         ieee80211_handle_filtered_frame(local, sta, skb);
 796                         return;
 797                 } else {
 798                         if (!acked)
 799                                 sta->status_stats.retry_failed++;
 800                         sta->status_stats.retry_count += retry_count;
 801
 802                         if (ieee80211_is_data_present(fc)) {
 803                                 if (!acked)
 804                                         sta->status_stats.msdu_failed[tid]++;
 805
 806                                 sta->status_stats.msdu_retries[tid] +=
 807                                         retry_count;
 808                         }
 809                 }
 810
 811                 rate_control_tx_status(local, sband, status);
 812                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
 813                         ieee80211s_update_metric(local, sta, status);
 814
 815                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 816                         ieee80211_frame_acked(sta, skb);
 817
 818                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
 819                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 820                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
 821                                                 acked, info->status.tx_time);
 822
 823                 if (info->status.tx_time &&
 824                     wiphy_ext_feature_isset(local->hw.wiphy,
 825                                             NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
 826                         ieee80211_sta_register_airtime(&sta->sta, tid,
 827                                                        info->status.tx_time, 0);
 828
 829                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
 830                         if (info->flags & IEEE80211_TX_STAT_ACK) {
 831                                 if (sta->status_stats.lost_packets)
 832                                         sta->status_stats.lost_packets = 0;
 833
 834                                 /* Track when last TDLS packet was ACKed */
 835                                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 836                                         sta->status_stats.last_tdls_pkt_time =
 837                                                 jiffies;
 838                         } else {
 839                                 ieee80211_lost_packet(sta, info);
 840                         }
 841                 }
 842         }
 843
 844         /* SNMP counters
 845          * Fragments are passed to low-level drivers as separate skbs, so these
 846          * are actually fragments, not frames. Update frame counters only for
 847          * the first fragment of the frame. */
 848         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
 849             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
 850                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
 851                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
 852                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
 853                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
 854                         if (retry_count > 0)
 855                                 I802_DEBUG_INC(local->dot11RetryCount);
 856                         if (retry_count > 1)
 857                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
 858                 }
 859
 860                 /* This counter shall be incremented for an acknowledged MPDU
 861                  * with an individual address in the address 1 field or an MPDU
 862                  * with a multicast address in the address 1 field of type Data
 863                  * or Management. */
 864                 if (!is_multicast_ether_addr(hdr->addr1) ||
 865                     ieee80211_is_data(fc) ||
 866                     ieee80211_is_mgmt(fc))
 867                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
 868         } else {
 869                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
 870                         I802_DEBUG_INC(local->dot11FailedCount);
 871         }
 872
 873         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
 874             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
 875             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
 876             local->ps_sdata && !(local->scanning)) {
 877                 if (info->flags & IEEE80211_TX_STAT_ACK) {
 878                         local->ps_sdata->u.mgd.flags |=
 879                                         IEEE80211_STA_NULLFUNC_ACKED;
 880                 } else
 881                         mod_timer(&local->dynamic_ps_timer, jiffies +
 882                                         msecs_to_jiffies(10));
 883         }
 884
 885         ieee80211_report_used_skb(local, skb, false);
 886
 887         /* this was a transmitted frame, but now we want to reuse it */
 888         skb_orphan(skb);
 889
 890         /* Need to make a copy before skb->cb gets cleared */
 891         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
 892                          !(ieee80211_is_data(fc));
 893
 894         /*
 895          * This is a bit racy but we can avoid a lot of work
 896          * with this test...
 897          */
 898         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
 899                 dev_kfree_skb(skb);
 900                 return;
 901         }
 902
 903         /* send to monitor interfaces */
 904         ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
 905 }
 906
 907 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 908 {
 909         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 910         struct ieee80211_local *local = hw_to_local(hw);
 911         struct ieee80211_tx_status status = {
 912                 .skb = skb,
 913                 .info = IEEE80211_SKB_CB(skb),
 914         };
 915         struct rhlist_head *tmp;
 916         struct sta_info *sta;
 917
 918         rcu_read_lock();
 919
 920         for_each_sta_info(local, hdr->addr1, sta, tmp) {
 921                 /* skip wrong virtual interface */
 922                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
 923                         continue;
 924
 925                 status.sta = &sta->sta;
 926                 break;
 927         }
 928
 929         __ieee80211_tx_status(hw, &status);
 930         rcu_read_unlock();
 931 }
 932 EXPORT_SYMBOL(ieee80211_tx_status);
 933
 934 void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
 935                              struct ieee80211_tx_status *status)
 936 {
 937         struct ieee80211_local *local = hw_to_local(hw);
 938         struct ieee80211_tx_info *info = status->info;
 939         struct ieee80211_sta *pubsta = status->sta;
 940         struct ieee80211_supported_band *sband;
 941         int retry_count;
 942         bool acked, noack_success;
 943
 944         if (status->skb)
 945                 return __ieee80211_tx_status(hw, status);
 946
 947         if (!status->sta)
 948                 return;
 949
 950         ieee80211_tx_get_rates(hw, info, &retry_count);
 951
 952         sband = hw->wiphy->bands[info->band];
 953
 954         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 955         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 956
 957         if (pubsta) {
 958                 struct sta_info *sta;
 959
 960                 sta = container_of(pubsta, struct sta_info, sta);
 961
 962                 if (!acked)
 963                         sta->status_stats.retry_failed++;
 964                 sta->status_stats.retry_count += retry_count;
 965
 966                 if (acked) {
 967                         sta->status_stats.last_ack = jiffies;
 968
 969                         if (sta->status_stats.lost_packets)
 970                                 sta->status_stats.lost_packets = 0;
 971
 972                         /* Track when last TDLS packet was ACKed */
 973                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 974                                 sta->status_stats.last_tdls_pkt_time = jiffies;
 975                 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
 976                         return;
 977                 } else {
 978                         ieee80211_lost_packet(sta, info);
 979                 }
 980
 981                 rate_control_tx_status(local, sband, status);
 982                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
 983                         ieee80211s_update_metric(local, sta, status);
 984         }
 985
 986         if (acked || noack_success) {
 987                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
 988                 if (!pubsta)
 989                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
 990                 if (retry_count > 0)
 991                         I802_DEBUG_INC(local->dot11RetryCount);
 992                 if (retry_count > 1)
 993                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
 994         } else {
 995                 I802_DEBUG_INC(local->dot11FailedCount);
 996         }
 997 }
 998 EXPORT_SYMBOL(ieee80211_tx_status_ext);
 999
1000 void ieee80211_tx_rate_update(struct ieee80211_hw *hw,
1001                               struct ieee80211_sta *pubsta,
1002                               struct ieee80211_tx_info *info)
1003 {
1004         struct ieee80211_local *local = hw_to_local(hw);
1005         struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band];
1006         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1007         struct ieee80211_tx_status status = {
1008                 .info = info,
1009                 .sta = pubsta,
1010         };
1011
1012         rate_control_tx_status(local, sband, &status);
1013
1014         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
1015                 sta->tx_stats.last_rate = info->status.rates[0];
1016 }
1017 EXPORT_SYMBOL(ieee80211_tx_rate_update);
1018
1019 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
1020 {
1021         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1022         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
1023                                     num_packets, GFP_ATOMIC);
1024 }
1025 EXPORT_SYMBOL(ieee80211_report_low_ack);
1026
1027 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
1028 {
1029         struct ieee80211_local *local = hw_to_local(hw);
1030
1031         ieee80211_report_used_skb(local, skb, true);
1032         dev_kfree_skb_any(skb);
1033 }
1034 EXPORT_SYMBOL(ieee80211_free_txskb);
1035
1036 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
1037                               struct sk_buff_head *skbs)
1038 {
1039         struct sk_buff *skb;
1040
1041         while ((skb = __skb_dequeue(skbs)))
1042                 ieee80211_free_txskb(hw, skb);
1043 }