net/mac80211/status.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  * Copyright 2008-2010  Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/export.h>
  14 #include <linux/etherdevice.h>
  15 #include <net/mac80211.h>
  16 #include <asm/unaligned.h>
  17 #include "ieee80211_i.h"
  18 #include "rate.h"
  19 #include "mesh.h"
  20 #include "led.h"
  21 #include "wme.h"
  22
  23
  24 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
  25                                  struct sk_buff *skb)
  26 {
  27         struct ieee80211_local *local = hw_to_local(hw);
  28         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  29         int tmp;
  30
  31         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
  32         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
  33                        &local->skb_queue : &local->skb_queue_unreliable, skb);
  34         tmp = skb_queue_len(&local->skb_queue) +
  35                 skb_queue_len(&local->skb_queue_unreliable);
  36         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
  37                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
  38                 ieee80211_free_txskb(hw, skb);
  39                 tmp--;
  40                 I802_DEBUG_INC(local->tx_status_drop);
  41         }
  42         tasklet_schedule(&local->tasklet);
  43 }
  44 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
  45
  46 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
  47                                             struct sta_info *sta,
  48                                             struct sk_buff *skb)
  49 {
  50         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  51         struct ieee80211_hdr *hdr = (void *)skb->data;
  52         int ac;
  53
  54         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
  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->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
  72                        IEEE80211_TX_INTFL_RETRANSMISSION;
  73         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
  74
  75         sta->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_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 191                 sta->status_stats.last_ack = jiffies;
 192
 193         if (ieee80211_is_data_qos(mgmt->frame_control)) {
 194                 struct ieee80211_hdr *hdr = (void *) skb->data;
 195                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 196                 u16 tid = qc[0] & 0xf;
 197
 198                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
 199         }
 200
 201         if (ieee80211_is_action(mgmt->frame_control) &&
 202             mgmt->u.action.category == WLAN_CATEGORY_HT &&
 203             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
 204             ieee80211_sdata_running(sdata)) {
 205                 enum ieee80211_smps_mode smps_mode;
 206
 207                 switch (mgmt->u.action.u.ht_smps.smps_control) {
 208                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 209                         smps_mode = IEEE80211_SMPS_DYNAMIC;
 210                         break;
 211                 case WLAN_HT_SMPS_CONTROL_STATIC:
 212                         smps_mode = IEEE80211_SMPS_STATIC;
 213                         break;
 214                 case WLAN_HT_SMPS_CONTROL_DISABLED:
 215                 default: /* shouldn't happen since we don't send that */
 216                         smps_mode = IEEE80211_SMPS_OFF;
 217                         break;
 218                 }
 219
 220                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 221                         /*
 222                          * This update looks racy, but isn't -- if we come
 223                          * here we've definitely got a station that we're
 224                          * talking to, and on a managed interface that can
 225                          * only be the AP. And the only other place updating
 226                          * this variable in managed mode is before association.
 227                          */
 228                         sdata->smps_mode = smps_mode;
 229                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
 230                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
 231                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 232                         sta->known_smps_mode = smps_mode;
 233                 }
 234         }
 235 }
 236
 237 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
 238 {
 239         struct tid_ampdu_tx *tid_tx;
 240
 241         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 242         if (!tid_tx)
 243                 return;
 244
 245         tid_tx->failed_bar_ssn = ssn;
 246         tid_tx->bar_pending = true;
 247 }
 248
 249 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
 250 {
 251         int len = sizeof(struct ieee80211_radiotap_header);
 252
 253         /* IEEE80211_RADIOTAP_RATE rate */
 254         if (info->status.rates[0].idx >= 0 &&
 255             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 256                                              IEEE80211_TX_RC_VHT_MCS)))
 257                 len += 2;
 258
 259         /* IEEE80211_RADIOTAP_TX_FLAGS */
 260         len += 2;
 261
 262         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 263         len += 1;
 264
 265         /* IEEE80211_RADIOTAP_MCS
 266          * IEEE80211_RADIOTAP_VHT */
 267         if (info->status.rates[0].idx >= 0) {
 268                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
 269                         len += 3;
 270                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
 271                         len = ALIGN(len, 2) + 12;
 272         }
 273
 274         return len;
 275 }
 276
 277 static void
 278 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
 279                                  struct ieee80211_supported_band *sband,
 280                                  struct sk_buff *skb, int retry_count,
 281                                  int rtap_len, int shift)
 282 {
 283         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 284         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 285         struct ieee80211_radiotap_header *rthdr;
 286         unsigned char *pos;
 287         u16 txflags;
 288
 289         rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
 290
 291         memset(rthdr, 0, rtap_len);
 292         rthdr->it_len = cpu_to_le16(rtap_len);
 293         rthdr->it_present =
 294                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 295                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 296         pos = (unsigned char *)(rthdr + 1);
 297
 298         /*
 299          * XXX: Once radiotap gets the bitmap reset thing the vendor
 300          *      extensions proposal contains, we can actually report
 301          *      the whole set of tries we did.
 302          */
 303
 304         /* IEEE80211_RADIOTAP_RATE */
 305         if (info->status.rates[0].idx >= 0 &&
 306             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
 307                                              IEEE80211_TX_RC_VHT_MCS))) {
 308                 u16 rate;
 309
 310                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
 311                 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
 312                 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
 313                 /* padding for tx flags */
 314                 pos += 2;
 315         }
 316
 317         /* IEEE80211_RADIOTAP_TX_FLAGS */
 318         txflags = 0;
 319         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
 320             !is_multicast_ether_addr(hdr->addr1))
 321                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
 322
 323         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 324                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
 325         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
 326                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
 327
 328         put_unaligned_le16(txflags, pos);
 329         pos += 2;
 330
 331         /* IEEE80211_RADIOTAP_DATA_RETRIES */
 332         /* for now report the total retry_count */
 333         *pos = retry_count;
 334         pos++;
 335
 336         if (info->status.rates[0].idx < 0)
 337                 return;
 338
 339         /* IEEE80211_RADIOTAP_MCS
 340          * IEEE80211_RADIOTAP_VHT */
 341         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
 342                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
 343                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 344                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 345                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 346                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 347                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
 348                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 349                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
 350                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
 351                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
 352                 pos[2] = info->status.rates[0].idx;
 353                 pos += 3;
 354         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
 355                 u16 known = local->hw.radiotap_vht_details &
 356                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 357                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
 358
 359                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
 360
 361                 /* required alignment from rthdr */
 362                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
 363
 364                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
 365                 put_unaligned_le16(known, pos);
 366                 pos += 2;
 367
 368                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
 369                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
 370                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
 371                 pos++;
 372
 373                 /* u8 bandwidth */
 374                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 375                         *pos = 1;
 376                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 377                         *pos = 4;
 378                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
 379                         *pos = 11;
 380                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
 381                         *pos = 0;
 382                 pos++;
 383
 384                 /* u8 mcs_nss[4] */
 385                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
 386                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
 387                 pos += 4;
 388
 389                 /* u8 coding */
 390                 pos++;
 391                 /* u8 group_id */
 392                 pos++;
 393                 /* u16 partial_aid */
 394                 pos += 2;
 395         }
 396 }
 397
 398 /*
 399  * Handles the tx for TDLS teardown frames.
 400  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
 401  */
 402 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
 403                                         struct ieee80211_sub_if_data *sdata,
 404                                         struct sk_buff *skb, u32 flags)
 405 {
 406         struct sk_buff *teardown_skb;
 407         struct sk_buff *orig_teardown_skb;
 408         bool is_teardown = false;
 409
 410         /* Get the teardown data we need and free the lock */
 411         spin_lock(&sdata->u.mgd.teardown_lock);
 412         teardown_skb = sdata->u.mgd.teardown_skb;
 413         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
 414         if ((skb == orig_teardown_skb) && teardown_skb) {
 415                 sdata->u.mgd.teardown_skb = NULL;
 416                 sdata->u.mgd.orig_teardown_skb = NULL;
 417                 is_teardown = true;
 418         }
 419         spin_unlock(&sdata->u.mgd.teardown_lock);
 420
 421         if (is_teardown) {
 422                 /* This mechanism relies on being able to get ACKs */
 423                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
 424
 425                 /* Check if peer has ACKed */
 426                 if (flags & IEEE80211_TX_STAT_ACK) {
 427                         dev_kfree_skb_any(teardown_skb);
 428                 } else {
 429                         tdls_dbg(sdata,
 430                                  "TDLS Resending teardown through AP\n");
 431
 432                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
 433                 }
 434         }
 435 }
 436
 437 static struct ieee80211_sub_if_data *
 438 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
 439 {
 440         struct ieee80211_sub_if_data *sdata;
 441
 442         if (skb->dev) {
 443                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 444                         if (!sdata->dev)
 445                                 continue;
 446
 447                         if (skb->dev == sdata->dev)
 448                                 return sdata;
 449                 }
 450
 451                 return NULL;
 452         }
 453
 454         return rcu_dereference(local->p2p_sdata);
 455 }
 456
 457 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
 458                                      struct ieee80211_tx_info *info,
 459                                      bool acked, bool dropped)
 460 {
 461         struct sk_buff *skb;
 462         unsigned long flags;
 463
 464         spin_lock_irqsave(&local->ack_status_lock, flags);
 465         skb = idr_find(&local->ack_status_frames, info->ack_frame_id);
 466         if (skb)
 467                 idr_remove(&local->ack_status_frames, info->ack_frame_id);
 468         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 469
 470         if (!skb)
 471                 return;
 472
 473         if (dropped) {
 474                 dev_kfree_skb_any(skb);
 475                 return;
 476         }
 477
 478         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
 479                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
 480                 struct ieee80211_sub_if_data *sdata;
 481                 struct ieee80211_hdr *hdr = (void *)skb->data;
 482
 483                 rcu_read_lock();
 484                 sdata = ieee80211_sdata_from_skb(local, skb);
 485                 if (sdata) {
 486                         if (ieee80211_is_nullfunc(hdr->frame_control) ||
 487                             ieee80211_is_qos_nullfunc(hdr->frame_control))
 488                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
 489                                                       cookie, acked,
 490                                                       GFP_ATOMIC);
 491                         else
 492                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
 493                                                         skb->data, skb->len,
 494                                                         acked, GFP_ATOMIC);
 495                 }
 496                 rcu_read_unlock();
 497
 498                 dev_kfree_skb_any(skb);
 499         } else {
 500                 /* consumes skb */
 501                 skb_complete_wifi_ack(skb, acked);
 502         }
 503 }
 504
 505 static void ieee80211_report_used_skb(struct ieee80211_local *local,
 506                                       struct sk_buff *skb, bool dropped)
 507 {
 508         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 509         struct ieee80211_hdr *hdr = (void *)skb->data;
 510         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
 511
 512         if (dropped)
 513                 acked = false;
 514
 515         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
 516                 struct ieee80211_sub_if_data *sdata;
 517
 518                 rcu_read_lock();
 519
 520                 sdata = ieee80211_sdata_from_skb(local, skb);
 521
 522                 if (!sdata) {
 523                         skb->dev = NULL;
 524                 } else {
 525                         unsigned int hdr_size =
 526                                 ieee80211_hdrlen(hdr->frame_control);
 527
 528                         /* Check to see if packet is a TDLS teardown packet */
 529                         if (ieee80211_is_data(hdr->frame_control) &&
 530                             (ieee80211_get_tdls_action(skb, hdr_size) ==
 531                              WLAN_TDLS_TEARDOWN))
 532                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
 533                                                             info->flags);
 534                         else
 535                                 ieee80211_mgd_conn_tx_status(sdata,
 536                                                              hdr->frame_control,
 537                                                              acked);
 538                 }
 539
 540                 rcu_read_unlock();
 541         } else if (info->ack_frame_id) {
 542                 ieee80211_report_ack_skb(local, info, acked, dropped);
 543         }
 544
 545         if (!dropped && skb->destructor) {
 546                 skb->wifi_acked_valid = 1;
 547                 skb->wifi_acked = acked;
 548         }
 549 }
 550
 551 /*
 552  * Use a static threshold for now, best value to be determined
 553  * by testing ...
 554  * Should it depend on:
 555  *  - on # of retransmissions
 556  *  - current throughput (higher value for higher tpt)?
 557  */
 558 #define STA_LOST_PKT_THRESHOLD  50
 559 #define STA_LOST_TDLS_PKT_THRESHOLD     10
 560 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
 561
 562 static void ieee80211_lost_packet(struct sta_info *sta,
 563                                   struct ieee80211_tx_info *info)
 564 {
 565         /* If driver relies on its own algorithm for station kickout, skip
 566          * mac80211 packet loss mechanism.
 567          */
 568         if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
 569                 return;
 570
 571         /* This packet was aggregated but doesn't carry status info */
 572         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 573             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 574                 return;
 575
 576         sta->status_stats.lost_packets++;
 577         if (!sta->sta.tdls &&
 578             sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
 579                 return;
 580
 581         /*
 582          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
 583          * of the last packets were lost, and that no ACK was received in the
 584          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
 585          * mechanism.
 586          */
 587         if (sta->sta.tdls &&
 588             (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
 589              time_before(jiffies,
 590                          sta->status_stats.last_tdls_pkt_time +
 591                          STA_LOST_TDLS_PKT_TIME)))
 592                 return;
 593
 594         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 595                                     sta->status_stats.lost_packets, GFP_ATOMIC);
 596         sta->status_stats.lost_packets = 0;
 597 }
 598
 599 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
 600                                   struct ieee80211_tx_info *info,
 601                                   int *retry_count)
 602 {
 603         int rates_idx = -1;
 604         int count = -1;
 605         int i;
 606
 607         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 608                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 609                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
 610                         /* just the first aggr frame carry status info */
 611                         info->status.rates[i].idx = -1;
 612                         info->status.rates[i].count = 0;
 613                         break;
 614                 } else if (info->status.rates[i].idx < 0) {
 615                         break;
 616                 } else if (i >= hw->max_report_rates) {
 617                         /* the HW cannot have attempted that rate */
 618                         info->status.rates[i].idx = -1;
 619                         info->status.rates[i].count = 0;
 620                         break;
 621                 }
 622
 623                 count += info->status.rates[i].count;
 624         }
 625         rates_idx = i - 1;
 626
 627         if (count < 0)
 628                 count = 0;
 629
 630         *retry_count = count;
 631         return rates_idx;
 632 }
 633
 634 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
 635                                struct ieee80211_sta *pubsta,
 636                                struct ieee80211_tx_info *info)
 637 {
 638         struct ieee80211_local *local = hw_to_local(hw);
 639         struct ieee80211_supported_band *sband;
 640         int retry_count;
 641         bool acked, noack_success;
 642
 643         ieee80211_tx_get_rates(hw, info, &retry_count);
 644
 645         sband = hw->wiphy->bands[info->band];
 646
 647         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 648         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
 649
 650         if (pubsta) {
 651                 struct sta_info *sta;
 652
 653                 sta = container_of(pubsta, struct sta_info, sta);
 654
 655                 if (!acked)
 656                         sta->status_stats.retry_failed++;
 657                 sta->status_stats.retry_count += retry_count;
 658
 659                 if (acked) {
 660                         sta->status_stats.last_ack = jiffies;
 661
 662                         if (sta->status_stats.lost_packets)
 663                                 sta->status_stats.lost_packets = 0;
 664
 665                         /* Track when last TDLS packet was ACKed */
 666                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 667                                 sta->status_stats.last_tdls_pkt_time = jiffies;
 668                 } else {
 669                         ieee80211_lost_packet(sta, info);
 670                 }
 671
 672                 rate_control_tx_status_noskb(local, sband, sta, info);
 673         }
 674
 675         if (acked || noack_success) {
 676                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
 677                 if (!pubsta)
 678                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
 679                 if (retry_count > 0)
 680                         I802_DEBUG_INC(local->dot11RetryCount);
 681                 if (retry_count > 1)
 682                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
 683         } else {
 684                 I802_DEBUG_INC(local->dot11FailedCount);
 685         }
 686 }
 687 EXPORT_SYMBOL(ieee80211_tx_status_noskb);
 688
 689 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
 690                           struct ieee80211_supported_band *sband,
 691                           int retry_count, int shift, bool send_to_cooked)
 692 {
 693         struct sk_buff *skb2;
 694         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 695         struct ieee80211_sub_if_data *sdata;
 696         struct net_device *prev_dev = NULL;
 697         int rtap_len;
 698
 699         /* send frame to monitor interfaces now */
 700         rtap_len = ieee80211_tx_radiotap_len(info);
 701         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
 702                 pr_err("ieee80211_tx_status: headroom too small\n");
 703                 dev_kfree_skb(skb);
 704                 return;
 705         }
 706         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
 707                                          rtap_len, shift);
 708
 709         /* XXX: is this sufficient for BPF? */
 710         skb_reset_mac_header(skb);
 711         skb->ip_summed = CHECKSUM_UNNECESSARY;
 712         skb->pkt_type = PACKET_OTHERHOST;
 713         skb->protocol = htons(ETH_P_802_2);
 714         memset(skb->cb, 0, sizeof(skb->cb));
 715
 716         rcu_read_lock();
 717         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 718                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
 719                         if (!ieee80211_sdata_running(sdata))
 720                                 continue;
 721
 722                         if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
 723                             !send_to_cooked)
 724                                 continue;
 725
 726                         if (prev_dev) {
 727                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 728                                 if (skb2) {
 729                                         skb2->dev = prev_dev;
 730                                         netif_rx(skb2);
 731                                 }
 732                         }
 733
 734                         prev_dev = sdata->dev;
 735                 }
 736         }
 737         if (prev_dev) {
 738                 skb->dev = prev_dev;
 739                 netif_rx(skb);
 740                 skb = NULL;
 741         }
 742         rcu_read_unlock();
 743         dev_kfree_skb(skb);
 744 }
 745
 746 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 747 {
 748         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 749         struct ieee80211_local *local = hw_to_local(hw);
 750         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 751         __le16 fc;
 752         struct ieee80211_supported_band *sband;
 753         struct rhlist_head *tmp;
 754         struct sta_info *sta;
 755         int retry_count;
 756         int rates_idx;
 757         bool send_to_cooked;
 758         bool acked;
 759         struct ieee80211_bar *bar;
 760         int shift = 0;
 761         int tid = IEEE80211_NUM_TIDS;
 762
 763         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
 764
 765         rcu_read_lock();
 766
 767         sband = local->hw.wiphy->bands[info->band];
 768         fc = hdr->frame_control;
 769
 770         for_each_sta_info(local, hdr->addr1, sta, tmp) {
 771                 /* skip wrong virtual interface */
 772                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
 773                         continue;
 774
 775                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
 776
 777                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
 778                         clear_sta_flag(sta, WLAN_STA_SP);
 779
 780                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
 781
 782                 /* mesh Peer Service Period support */
 783                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
 784                     ieee80211_is_data_qos(fc))
 785                         ieee80211_mpsp_trigger_process(
 786                                 ieee80211_get_qos_ctl(hdr), sta, true, acked);
 787
 788                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
 789                         /*
 790                          * The STA is in power save mode, so assume
 791                          * that this TX packet failed because of that.
 792                          */
 793                         ieee80211_handle_filtered_frame(local, sta, skb);
 794                         rcu_read_unlock();
 795                         return;
 796                 }
 797
 798                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
 799                     (ieee80211_is_data(hdr->frame_control)) &&
 800                     (rates_idx != -1))
 801                         sta->tx_stats.last_rate =
 802                                 info->status.rates[rates_idx];
 803
 804                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
 805                     (ieee80211_is_data_qos(fc))) {
 806                         u16 ssn;
 807                         u8 *qc;
 808
 809                         qc = ieee80211_get_qos_ctl(hdr);
 810                         tid = qc[0] & 0xf;
 811                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
 812                                                 & IEEE80211_SCTL_SEQ);
 813                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
 814                                            tid, ssn);
 815                 } else if (ieee80211_is_data_qos(fc)) {
 816                         u8 *qc = ieee80211_get_qos_ctl(hdr);
 817
 818                         tid = qc[0] & 0xf;
 819                 }
 820
 821                 if (!acked && ieee80211_is_back_req(fc)) {
 822                         u16 control;
 823
 824                         /*
 825                          * BAR failed, store the last SSN and retry sending
 826                          * the BAR when the next unicast transmission on the
 827                          * same TID succeeds.
 828                          */
 829                         bar = (struct ieee80211_bar *) skb->data;
 830                         control = le16_to_cpu(bar->control);
 831                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
 832                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
 833
 834                                 tid = (control &
 835                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
 836                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
 837
 838                                 ieee80211_set_bar_pending(sta, tid, ssn);
 839                         }
 840                 }
 841
 842                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
 843                         ieee80211_handle_filtered_frame(local, sta, skb);
 844                         rcu_read_unlock();
 845                         return;
 846                 } else {
 847                         if (!acked)
 848                                 sta->status_stats.retry_failed++;
 849                         sta->status_stats.retry_count += retry_count;
 850
 851                         if (ieee80211_is_data_present(fc)) {
 852                                 if (!acked)
 853                                         sta->status_stats.msdu_failed[tid]++;
 854
 855                                 sta->status_stats.msdu_retries[tid] +=
 856                                         retry_count;
 857                         }
 858                 }
 859
 860                 rate_control_tx_status(local, sband, sta, skb);
 861                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
 862                         ieee80211s_update_metric(local, sta, skb);
 863
 864                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
 865                         ieee80211_frame_acked(sta, skb);
 866
 867                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
 868                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
 869                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
 870                                                 acked, info->status.tx_time);
 871
 872                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
 873                         if (info->flags & IEEE80211_TX_STAT_ACK) {
 874                                 if (sta->status_stats.lost_packets)
 875                                         sta->status_stats.lost_packets = 0;
 876
 877                                 /* Track when last TDLS packet was ACKed */
 878                                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 879                                         sta->status_stats.last_tdls_pkt_time =
 880                                                 jiffies;
 881                         } else {
 882                                 ieee80211_lost_packet(sta, info);
 883                         }
 884                 }
 885         }
 886
 887         rcu_read_unlock();
 888
 889         ieee80211_led_tx(local);
 890
 891         /* SNMP counters
 892          * Fragments are passed to low-level drivers as separate skbs, so these
 893          * are actually fragments, not frames. Update frame counters only for
 894          * the first fragment of the frame. */
 895         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
 896             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
 897                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
 898                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
 899                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
 900                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
 901                         if (retry_count > 0)
 902                                 I802_DEBUG_INC(local->dot11RetryCount);
 903                         if (retry_count > 1)
 904                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
 905                 }
 906
 907                 /* This counter shall be incremented for an acknowledged MPDU
 908                  * with an individual address in the address 1 field or an MPDU
 909                  * with a multicast address in the address 1 field of type Data
 910                  * or Management. */
 911                 if (!is_multicast_ether_addr(hdr->addr1) ||
 912                     ieee80211_is_data(fc) ||
 913                     ieee80211_is_mgmt(fc))
 914                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
 915         } else {
 916                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
 917                         I802_DEBUG_INC(local->dot11FailedCount);
 918         }
 919
 920         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
 921             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
 922             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
 923             local->ps_sdata && !(local->scanning)) {
 924                 if (info->flags & IEEE80211_TX_STAT_ACK) {
 925                         local->ps_sdata->u.mgd.flags |=
 926                                         IEEE80211_STA_NULLFUNC_ACKED;
 927                 } else
 928                         mod_timer(&local->dynamic_ps_timer, jiffies +
 929                                         msecs_to_jiffies(10));
 930         }
 931
 932         ieee80211_report_used_skb(local, skb, false);
 933
 934         /* this was a transmitted frame, but now we want to reuse it */
 935         skb_orphan(skb);
 936
 937         /* Need to make a copy before skb->cb gets cleared */
 938         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
 939                          !(ieee80211_is_data(fc));
 940
 941         /*
 942          * This is a bit racy but we can avoid a lot of work
 943          * with this test...
 944          */
 945         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
 946                 dev_kfree_skb(skb);
 947                 return;
 948         }
 949
 950         /* send to monitor interfaces */
 951         ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
 952 }
 953 EXPORT_SYMBOL(ieee80211_tx_status);
 954
 955 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
 956 {
 957         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
 958         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
 959                                     num_packets, GFP_ATOMIC);
 960 }
 961 EXPORT_SYMBOL(ieee80211_report_low_ack);
 962
 963 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
 964 {
 965         struct ieee80211_local *local = hw_to_local(hw);
 966
 967         ieee80211_report_used_skb(local, skb, true);
 968         dev_kfree_skb_any(skb);
 969 }
 970 EXPORT_SYMBOL(ieee80211_free_txskb);
 971
 972 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
 973                               struct sk_buff_head *skbs)
 974 {
 975         struct sk_buff *skb;
 976
 977         while ((skb = __skb_dequeue(skbs)))
 978                 ieee80211_free_txskb(hw, skb);
 979 }