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 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/export.h> 13 #include <linux/etherdevice.h> 14 #include <net/mac80211.h> 15 #include <asm/unaligned.h> 16 #include "ieee80211_i.h" 17 #include "rate.h" 18 #include "mesh.h" 19 #include "led.h" 20 #include "wme.h" 21 22 23 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 24 struct sk_buff *skb) 25 { 26 struct ieee80211_local *local = hw_to_local(hw); 27 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 28 int tmp; 29 30 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 31 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 32 &local->skb_queue : &local->skb_queue_unreliable, skb); 33 tmp = skb_queue_len(&local->skb_queue) + 34 skb_queue_len(&local->skb_queue_unreliable); 35 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 36 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 37 ieee80211_free_txskb(hw, skb); 38 tmp--; 39 I802_DEBUG_INC(local->tx_status_drop); 40 } 41 tasklet_schedule(&local->tasklet); 42 } 43 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 44 45 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 46 struct sta_info *sta, 47 struct sk_buff *skb) 48 { 49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 50 struct ieee80211_hdr *hdr = (void *)skb->data; 51 int ac; 52 53 /* 54 * This skb 'survived' a round-trip through the driver, and 55 * hopefully the driver didn't mangle it too badly. However, 56 * we can definitely not rely on the control information 57 * being correct. Clear it so we don't get junk there, and 58 * indicate that it needs new processing, but must not be 59 * modified/encrypted again. 60 */ 61 memset(&info->control, 0, sizeof(info->control)); 62 63 info->control.jiffies = jiffies; 64 info->control.vif = &sta->sdata->vif; 65 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 66 IEEE80211_TX_INTFL_RETRANSMISSION; 67 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 68 69 sta->tx_filtered_count++; 70 71 /* 72 * Clear more-data bit on filtered frames, it might be set 73 * but later frames might time out so it might have to be 74 * clear again ... It's all rather unlikely (this frame 75 * should time out first, right?) but let's not confuse 76 * peers unnecessarily. 77 */ 78 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 79 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 80 81 if (ieee80211_is_data_qos(hdr->frame_control)) { 82 u8 *p = ieee80211_get_qos_ctl(hdr); 83 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 84 85 /* 86 * Clear EOSP if set, this could happen e.g. 87 * if an absence period (us being a P2P GO) 88 * shortens the SP. 89 */ 90 if (*p & IEEE80211_QOS_CTL_EOSP) 91 *p &= ~IEEE80211_QOS_CTL_EOSP; 92 ac = ieee802_1d_to_ac[tid & 7]; 93 } else { 94 ac = IEEE80211_AC_BE; 95 } 96 97 /* 98 * Clear the TX filter mask for this STA when sending the next 99 * packet. If the STA went to power save mode, this will happen 100 * when it wakes up for the next time. 101 */ 102 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 103 104 /* 105 * This code races in the following way: 106 * 107 * (1) STA sends frame indicating it will go to sleep and does so 108 * (2) hardware/firmware adds STA to filter list, passes frame up 109 * (3) hardware/firmware processes TX fifo and suppresses a frame 110 * (4) we get TX status before having processed the frame and 111 * knowing that the STA has gone to sleep. 112 * 113 * This is actually quite unlikely even when both those events are 114 * processed from interrupts coming in quickly after one another or 115 * even at the same time because we queue both TX status events and 116 * RX frames to be processed by a tasklet and process them in the 117 * same order that they were received or TX status last. Hence, there 118 * is no race as long as the frame RX is processed before the next TX 119 * status, which drivers can ensure, see below. 120 * 121 * Note that this can only happen if the hardware or firmware can 122 * actually add STAs to the filter list, if this is done by the 123 * driver in response to set_tim() (which will only reduce the race 124 * this whole filtering tries to solve, not completely solve it) 125 * this situation cannot happen. 126 * 127 * To completely solve this race drivers need to make sure that they 128 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 129 * functions and 130 * (b) always process RX events before TX status events if ordering 131 * can be unknown, for example with different interrupt status 132 * bits. 133 * (c) if PS mode transitions are manual (i.e. the flag 134 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 135 * changes before calling TX status events if ordering can be 136 * unknown. 137 */ 138 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 139 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 140 skb_queue_tail(&sta->tx_filtered[ac], skb); 141 sta_info_recalc_tim(sta); 142 143 if (!timer_pending(&local->sta_cleanup)) 144 mod_timer(&local->sta_cleanup, 145 round_jiffies(jiffies + 146 STA_INFO_CLEANUP_INTERVAL)); 147 return; 148 } 149 150 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 151 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 152 /* Software retry the packet once */ 153 info->flags |= IEEE80211_TX_INTFL_RETRIED; 154 ieee80211_add_pending_skb(local, skb); 155 return; 156 } 157 158 ps_dbg_ratelimited(sta->sdata, 159 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 160 skb_queue_len(&sta->tx_filtered[ac]), 161 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 162 ieee80211_free_txskb(&local->hw, skb); 163 } 164 165 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 166 { 167 struct tid_ampdu_tx *tid_tx; 168 169 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 170 if (!tid_tx || !tid_tx->bar_pending) 171 return; 172 173 tid_tx->bar_pending = false; 174 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 175 } 176 177 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 178 { 179 struct ieee80211_mgmt *mgmt = (void *) skb->data; 180 struct ieee80211_local *local = sta->local; 181 struct ieee80211_sub_if_data *sdata = sta->sdata; 182 183 if (ieee80211_is_data_qos(mgmt->frame_control)) { 184 struct ieee80211_hdr *hdr = (void *) skb->data; 185 u8 *qc = ieee80211_get_qos_ctl(hdr); 186 u16 tid = qc[0] & 0xf; 187 188 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 189 } 190 191 if (ieee80211_is_action(mgmt->frame_control) && 192 mgmt->u.action.category == WLAN_CATEGORY_HT && 193 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 194 sdata->vif.type == NL80211_IFTYPE_STATION && 195 ieee80211_sdata_running(sdata)) { 196 /* 197 * This update looks racy, but isn't -- if we come 198 * here we've definitely got a station that we're 199 * talking to, and on a managed interface that can 200 * only be the AP. And the only other place updating 201 * this variable in managed mode is before association. 202 */ 203 switch (mgmt->u.action.u.ht_smps.smps_control) { 204 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 205 sdata->smps_mode = IEEE80211_SMPS_DYNAMIC; 206 break; 207 case WLAN_HT_SMPS_CONTROL_STATIC: 208 sdata->smps_mode = IEEE80211_SMPS_STATIC; 209 break; 210 case WLAN_HT_SMPS_CONTROL_DISABLED: 211 default: /* shouldn't happen since we don't send that */ 212 sdata->smps_mode = IEEE80211_SMPS_OFF; 213 break; 214 } 215 216 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 217 } 218 } 219 220 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 221 { 222 struct tid_ampdu_tx *tid_tx; 223 224 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 225 if (!tid_tx) 226 return; 227 228 tid_tx->failed_bar_ssn = ssn; 229 tid_tx->bar_pending = true; 230 } 231 232 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 233 { 234 int len = sizeof(struct ieee80211_radiotap_header); 235 236 /* IEEE80211_RADIOTAP_RATE rate */ 237 if (info->status.rates[0].idx >= 0 && 238 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 239 len += 2; 240 241 /* IEEE80211_RADIOTAP_TX_FLAGS */ 242 len += 2; 243 244 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 245 len += 1; 246 247 /* IEEE80211_TX_RC_MCS */ 248 if (info->status.rates[0].idx >= 0 && 249 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 250 len += 3; 251 252 return len; 253 } 254 255 static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band 256 *sband, struct sk_buff *skb, 257 int retry_count, int rtap_len) 258 { 259 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 261 struct ieee80211_radiotap_header *rthdr; 262 unsigned char *pos; 263 u16 txflags; 264 265 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 266 267 memset(rthdr, 0, rtap_len); 268 rthdr->it_len = cpu_to_le16(rtap_len); 269 rthdr->it_present = 270 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 271 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 272 pos = (unsigned char *)(rthdr + 1); 273 274 /* 275 * XXX: Once radiotap gets the bitmap reset thing the vendor 276 * extensions proposal contains, we can actually report 277 * the whole set of tries we did. 278 */ 279 280 /* IEEE80211_RADIOTAP_RATE */ 281 if (info->status.rates[0].idx >= 0 && 282 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) { 283 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 284 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5; 285 /* padding for tx flags */ 286 pos += 2; 287 } 288 289 /* IEEE80211_RADIOTAP_TX_FLAGS */ 290 txflags = 0; 291 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 292 !is_multicast_ether_addr(hdr->addr1)) 293 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 294 295 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 296 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 297 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 298 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 299 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 300 301 put_unaligned_le16(txflags, pos); 302 pos += 2; 303 304 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 305 /* for now report the total retry_count */ 306 *pos = retry_count; 307 pos++; 308 309 /* IEEE80211_TX_RC_MCS */ 310 if (info->status.rates[0].idx >= 0 && 311 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 312 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 313 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 314 IEEE80211_RADIOTAP_MCS_HAVE_GI | 315 IEEE80211_RADIOTAP_MCS_HAVE_BW; 316 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 317 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 318 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 319 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 320 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 321 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 322 pos[2] = info->status.rates[0].idx; 323 pos += 3; 324 } 325 326 } 327 328 static void ieee80211_report_used_skb(struct ieee80211_local *local, 329 struct sk_buff *skb, bool dropped) 330 { 331 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 332 struct ieee80211_hdr *hdr = (void *)skb->data; 333 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 334 335 if (dropped) 336 acked = false; 337 338 if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 339 IEEE80211_TX_INTFL_MLME_CONN_TX)) { 340 struct ieee80211_sub_if_data *sdata = NULL; 341 struct ieee80211_sub_if_data *iter_sdata; 342 u64 cookie = (unsigned long)skb; 343 344 rcu_read_lock(); 345 346 if (skb->dev) { 347 list_for_each_entry_rcu(iter_sdata, &local->interfaces, 348 list) { 349 if (!iter_sdata->dev) 350 continue; 351 352 if (skb->dev == iter_sdata->dev) { 353 sdata = iter_sdata; 354 break; 355 } 356 } 357 } else { 358 sdata = rcu_dereference(local->p2p_sdata); 359 } 360 361 if (!sdata) { 362 skb->dev = NULL; 363 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 364 ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control, 365 acked); 366 } else if (ieee80211_is_nullfunc(hdr->frame_control) || 367 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 368 cfg80211_probe_status(sdata->dev, hdr->addr1, 369 cookie, acked, GFP_ATOMIC); 370 } else { 371 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data, 372 skb->len, acked, GFP_ATOMIC); 373 } 374 375 rcu_read_unlock(); 376 } 377 378 if (unlikely(info->ack_frame_id)) { 379 struct sk_buff *ack_skb; 380 unsigned long flags; 381 382 spin_lock_irqsave(&local->ack_status_lock, flags); 383 ack_skb = idr_find(&local->ack_status_frames, 384 info->ack_frame_id); 385 if (ack_skb) 386 idr_remove(&local->ack_status_frames, 387 info->ack_frame_id); 388 spin_unlock_irqrestore(&local->ack_status_lock, flags); 389 390 if (ack_skb) { 391 if (!dropped) { 392 /* consumes ack_skb */ 393 skb_complete_wifi_ack(ack_skb, acked); 394 } else { 395 dev_kfree_skb_any(ack_skb); 396 } 397 } 398 } 399 } 400 401 /* 402 * Use a static threshold for now, best value to be determined 403 * by testing ... 404 * Should it depend on: 405 * - on # of retransmissions 406 * - current throughput (higher value for higher tpt)? 407 */ 408 #define STA_LOST_PKT_THRESHOLD 50 409 410 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 411 { 412 struct sk_buff *skb2; 413 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 414 struct ieee80211_local *local = hw_to_local(hw); 415 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 416 __le16 fc; 417 struct ieee80211_supported_band *sband; 418 struct ieee80211_sub_if_data *sdata; 419 struct net_device *prev_dev = NULL; 420 struct sta_info *sta, *tmp; 421 int retry_count = -1, i; 422 int rates_idx = -1; 423 bool send_to_cooked; 424 bool acked; 425 struct ieee80211_bar *bar; 426 int rtap_len; 427 428 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 429 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 430 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 431 /* just the first aggr frame carry status info */ 432 info->status.rates[i].idx = -1; 433 info->status.rates[i].count = 0; 434 break; 435 } else if (info->status.rates[i].idx < 0) { 436 break; 437 } else if (i >= hw->max_report_rates) { 438 /* the HW cannot have attempted that rate */ 439 info->status.rates[i].idx = -1; 440 info->status.rates[i].count = 0; 441 break; 442 } 443 444 retry_count += info->status.rates[i].count; 445 } 446 rates_idx = i - 1; 447 448 if (retry_count < 0) 449 retry_count = 0; 450 451 rcu_read_lock(); 452 453 sband = local->hw.wiphy->bands[info->band]; 454 fc = hdr->frame_control; 455 456 for_each_sta_info(local, hdr->addr1, sta, tmp) { 457 /* skip wrong virtual interface */ 458 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 459 continue; 460 461 if (info->flags & IEEE80211_TX_STATUS_EOSP) 462 clear_sta_flag(sta, WLAN_STA_SP); 463 464 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 465 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 466 /* 467 * The STA is in power save mode, so assume 468 * that this TX packet failed because of that. 469 */ 470 ieee80211_handle_filtered_frame(local, sta, skb); 471 rcu_read_unlock(); 472 return; 473 } 474 475 /* mesh Peer Service Period support */ 476 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 477 ieee80211_is_data_qos(fc)) 478 ieee80211_mpsp_trigger_process( 479 ieee80211_get_qos_ctl(hdr), 480 sta, true, acked); 481 482 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 483 (rates_idx != -1)) 484 sta->last_tx_rate = info->status.rates[rates_idx]; 485 486 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 487 (ieee80211_is_data_qos(fc))) { 488 u16 tid, ssn; 489 u8 *qc; 490 491 qc = ieee80211_get_qos_ctl(hdr); 492 tid = qc[0] & 0xf; 493 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 494 & IEEE80211_SCTL_SEQ); 495 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 496 tid, ssn); 497 } 498 499 if (!acked && ieee80211_is_back_req(fc)) { 500 u16 tid, control; 501 502 /* 503 * BAR failed, store the last SSN and retry sending 504 * the BAR when the next unicast transmission on the 505 * same TID succeeds. 506 */ 507 bar = (struct ieee80211_bar *) skb->data; 508 control = le16_to_cpu(bar->control); 509 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 510 u16 ssn = le16_to_cpu(bar->start_seq_num); 511 512 tid = (control & 513 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 514 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 515 516 ieee80211_set_bar_pending(sta, tid, ssn); 517 } 518 } 519 520 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 521 ieee80211_handle_filtered_frame(local, sta, skb); 522 rcu_read_unlock(); 523 return; 524 } else { 525 if (!acked) 526 sta->tx_retry_failed++; 527 sta->tx_retry_count += retry_count; 528 } 529 530 rate_control_tx_status(local, sband, sta, skb); 531 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 532 ieee80211s_update_metric(local, sta, skb); 533 534 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 535 ieee80211_frame_acked(sta, skb); 536 537 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 538 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 539 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked); 540 541 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 542 if (info->flags & IEEE80211_TX_STAT_ACK) { 543 if (sta->lost_packets) 544 sta->lost_packets = 0; 545 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) { 546 cfg80211_cqm_pktloss_notify(sta->sdata->dev, 547 sta->sta.addr, 548 sta->lost_packets, 549 GFP_ATOMIC); 550 sta->lost_packets = 0; 551 } 552 } 553 554 if (acked) 555 sta->last_ack_signal = info->status.ack_signal; 556 } 557 558 rcu_read_unlock(); 559 560 ieee80211_led_tx(local, 0); 561 562 /* SNMP counters 563 * Fragments are passed to low-level drivers as separate skbs, so these 564 * are actually fragments, not frames. Update frame counters only for 565 * the first fragment of the frame. */ 566 if (info->flags & IEEE80211_TX_STAT_ACK) { 567 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 568 local->dot11TransmittedFrameCount++; 569 if (is_multicast_ether_addr(hdr->addr1)) 570 local->dot11MulticastTransmittedFrameCount++; 571 if (retry_count > 0) 572 local->dot11RetryCount++; 573 if (retry_count > 1) 574 local->dot11MultipleRetryCount++; 575 } 576 577 /* This counter shall be incremented for an acknowledged MPDU 578 * with an individual address in the address 1 field or an MPDU 579 * with a multicast address in the address 1 field of type Data 580 * or Management. */ 581 if (!is_multicast_ether_addr(hdr->addr1) || 582 ieee80211_is_data(fc) || 583 ieee80211_is_mgmt(fc)) 584 local->dot11TransmittedFragmentCount++; 585 } else { 586 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 587 local->dot11FailedCount++; 588 } 589 590 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 591 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 592 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 593 local->ps_sdata && !(local->scanning)) { 594 if (info->flags & IEEE80211_TX_STAT_ACK) { 595 local->ps_sdata->u.mgd.flags |= 596 IEEE80211_STA_NULLFUNC_ACKED; 597 } else 598 mod_timer(&local->dynamic_ps_timer, jiffies + 599 msecs_to_jiffies(10)); 600 } 601 602 ieee80211_report_used_skb(local, skb, false); 603 604 /* this was a transmitted frame, but now we want to reuse it */ 605 skb_orphan(skb); 606 607 /* Need to make a copy before skb->cb gets cleared */ 608 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 609 !(ieee80211_is_data(fc)); 610 611 /* 612 * This is a bit racy but we can avoid a lot of work 613 * with this test... 614 */ 615 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 616 dev_kfree_skb(skb); 617 return; 618 } 619 620 /* send frame to monitor interfaces now */ 621 rtap_len = ieee80211_tx_radiotap_len(info); 622 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 623 pr_err("ieee80211_tx_status: headroom too small\n"); 624 dev_kfree_skb(skb); 625 return; 626 } 627 ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len); 628 629 /* XXX: is this sufficient for BPF? */ 630 skb_set_mac_header(skb, 0); 631 skb->ip_summed = CHECKSUM_UNNECESSARY; 632 skb->pkt_type = PACKET_OTHERHOST; 633 skb->protocol = htons(ETH_P_802_2); 634 memset(skb->cb, 0, sizeof(skb->cb)); 635 636 rcu_read_lock(); 637 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 638 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 639 if (!ieee80211_sdata_running(sdata)) 640 continue; 641 642 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 643 !send_to_cooked) 644 continue; 645 646 if (prev_dev) { 647 skb2 = skb_clone(skb, GFP_ATOMIC); 648 if (skb2) { 649 skb2->dev = prev_dev; 650 netif_rx(skb2); 651 } 652 } 653 654 prev_dev = sdata->dev; 655 } 656 } 657 if (prev_dev) { 658 skb->dev = prev_dev; 659 netif_rx(skb); 660 skb = NULL; 661 } 662 rcu_read_unlock(); 663 dev_kfree_skb(skb); 664 } 665 EXPORT_SYMBOL(ieee80211_tx_status); 666 667 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 668 { 669 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 670 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 671 num_packets, GFP_ATOMIC); 672 } 673 EXPORT_SYMBOL(ieee80211_report_low_ack); 674 675 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 676 { 677 struct ieee80211_local *local = hw_to_local(hw); 678 679 ieee80211_report_used_skb(local, skb, true); 680 dev_kfree_skb_any(skb); 681 } 682 EXPORT_SYMBOL(ieee80211_free_txskb); 683 684 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 685 struct sk_buff_head *skbs) 686 { 687 struct sk_buff *skb; 688 689 while ((skb = __skb_dequeue(skbs))) 690 ieee80211_free_txskb(hw, skb); 691 } 692