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 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 184 sta->last_rx = jiffies; 185 186 if (ieee80211_is_data_qos(mgmt->frame_control)) { 187 struct ieee80211_hdr *hdr = (void *) skb->data; 188 u8 *qc = ieee80211_get_qos_ctl(hdr); 189 u16 tid = qc[0] & 0xf; 190 191 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 192 } 193 194 if (ieee80211_is_action(mgmt->frame_control) && 195 mgmt->u.action.category == WLAN_CATEGORY_HT && 196 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 197 ieee80211_sdata_running(sdata)) { 198 enum ieee80211_smps_mode smps_mode; 199 200 switch (mgmt->u.action.u.ht_smps.smps_control) { 201 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 202 smps_mode = IEEE80211_SMPS_DYNAMIC; 203 break; 204 case WLAN_HT_SMPS_CONTROL_STATIC: 205 smps_mode = IEEE80211_SMPS_STATIC; 206 break; 207 case WLAN_HT_SMPS_CONTROL_DISABLED: 208 default: /* shouldn't happen since we don't send that */ 209 smps_mode = IEEE80211_SMPS_OFF; 210 break; 211 } 212 213 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 214 /* 215 * This update looks racy, but isn't -- if we come 216 * here we've definitely got a station that we're 217 * talking to, and on a managed interface that can 218 * only be the AP. And the only other place updating 219 * this variable in managed mode is before association. 220 */ 221 sdata->smps_mode = smps_mode; 222 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 223 } else if (sdata->vif.type == NL80211_IFTYPE_AP || 224 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 225 sta->known_smps_mode = smps_mode; 226 } 227 } 228 } 229 230 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 231 { 232 struct tid_ampdu_tx *tid_tx; 233 234 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 235 if (!tid_tx) 236 return; 237 238 tid_tx->failed_bar_ssn = ssn; 239 tid_tx->bar_pending = true; 240 } 241 242 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 243 { 244 int len = sizeof(struct ieee80211_radiotap_header); 245 246 /* IEEE80211_RADIOTAP_RATE rate */ 247 if (info->status.rates[0].idx >= 0 && 248 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 249 IEEE80211_TX_RC_VHT_MCS))) 250 len += 2; 251 252 /* IEEE80211_RADIOTAP_TX_FLAGS */ 253 len += 2; 254 255 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 256 len += 1; 257 258 /* IEEE80211_RADIOTAP_MCS 259 * IEEE80211_RADIOTAP_VHT */ 260 if (info->status.rates[0].idx >= 0) { 261 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 262 len += 3; 263 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 264 len = ALIGN(len, 2) + 12; 265 } 266 267 return len; 268 } 269 270 static void 271 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 272 struct ieee80211_supported_band *sband, 273 struct sk_buff *skb, int retry_count, 274 int rtap_len, int shift) 275 { 276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 277 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 278 struct ieee80211_radiotap_header *rthdr; 279 unsigned char *pos; 280 u16 txflags; 281 282 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 283 284 memset(rthdr, 0, rtap_len); 285 rthdr->it_len = cpu_to_le16(rtap_len); 286 rthdr->it_present = 287 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 288 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 289 pos = (unsigned char *)(rthdr + 1); 290 291 /* 292 * XXX: Once radiotap gets the bitmap reset thing the vendor 293 * extensions proposal contains, we can actually report 294 * the whole set of tries we did. 295 */ 296 297 /* IEEE80211_RADIOTAP_RATE */ 298 if (info->status.rates[0].idx >= 0 && 299 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 300 IEEE80211_TX_RC_VHT_MCS))) { 301 u16 rate; 302 303 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 304 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 305 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 306 /* padding for tx flags */ 307 pos += 2; 308 } 309 310 /* IEEE80211_RADIOTAP_TX_FLAGS */ 311 txflags = 0; 312 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 313 !is_multicast_ether_addr(hdr->addr1)) 314 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 315 316 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 317 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 318 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 319 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 320 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 321 322 put_unaligned_le16(txflags, pos); 323 pos += 2; 324 325 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 326 /* for now report the total retry_count */ 327 *pos = retry_count; 328 pos++; 329 330 if (info->status.rates[0].idx < 0) 331 return; 332 333 /* IEEE80211_RADIOTAP_MCS 334 * IEEE80211_RADIOTAP_VHT */ 335 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 336 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 337 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 338 IEEE80211_RADIOTAP_MCS_HAVE_GI | 339 IEEE80211_RADIOTAP_MCS_HAVE_BW; 340 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 341 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 342 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 343 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 344 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 345 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 346 pos[2] = info->status.rates[0].idx; 347 pos += 3; 348 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { 349 u16 known = local->hw.radiotap_vht_details & 350 (IEEE80211_RADIOTAP_VHT_KNOWN_GI | 351 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); 352 353 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 354 355 /* required alignment from rthdr */ 356 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); 357 358 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ 359 put_unaligned_le16(known, pos); 360 pos += 2; 361 362 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ 363 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 364 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 365 pos++; 366 367 /* u8 bandwidth */ 368 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 369 *pos = 1; 370 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 371 *pos = 4; 372 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 373 *pos = 11; 374 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ 375 *pos = 0; 376 pos++; 377 378 /* u8 mcs_nss[4] */ 379 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | 380 ieee80211_rate_get_vht_nss(&info->status.rates[0]); 381 pos += 4; 382 383 /* u8 coding */ 384 pos++; 385 /* u8 group_id */ 386 pos++; 387 /* u16 partial_aid */ 388 pos += 2; 389 } 390 } 391 392 static void ieee80211_report_used_skb(struct ieee80211_local *local, 393 struct sk_buff *skb, bool dropped) 394 { 395 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 396 struct ieee80211_hdr *hdr = (void *)skb->data; 397 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 398 399 if (dropped) 400 acked = false; 401 402 if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 403 IEEE80211_TX_INTFL_MLME_CONN_TX)) { 404 struct ieee80211_sub_if_data *sdata = NULL; 405 struct ieee80211_sub_if_data *iter_sdata; 406 u64 cookie = (unsigned long)skb; 407 408 rcu_read_lock(); 409 410 if (skb->dev) { 411 list_for_each_entry_rcu(iter_sdata, &local->interfaces, 412 list) { 413 if (!iter_sdata->dev) 414 continue; 415 416 if (skb->dev == iter_sdata->dev) { 417 sdata = iter_sdata; 418 break; 419 } 420 } 421 } else { 422 sdata = rcu_dereference(local->p2p_sdata); 423 } 424 425 if (!sdata) { 426 skb->dev = NULL; 427 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 428 ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control, 429 acked); 430 } else if (ieee80211_is_nullfunc(hdr->frame_control) || 431 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 432 cfg80211_probe_status(sdata->dev, hdr->addr1, 433 cookie, acked, GFP_ATOMIC); 434 } else { 435 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data, 436 skb->len, acked, GFP_ATOMIC); 437 } 438 439 rcu_read_unlock(); 440 } 441 442 if (unlikely(info->ack_frame_id)) { 443 struct sk_buff *ack_skb; 444 unsigned long flags; 445 446 spin_lock_irqsave(&local->ack_status_lock, flags); 447 ack_skb = idr_find(&local->ack_status_frames, 448 info->ack_frame_id); 449 if (ack_skb) 450 idr_remove(&local->ack_status_frames, 451 info->ack_frame_id); 452 spin_unlock_irqrestore(&local->ack_status_lock, flags); 453 454 if (ack_skb) { 455 if (!dropped) { 456 /* consumes ack_skb */ 457 skb_complete_wifi_ack(ack_skb, acked); 458 } else { 459 dev_kfree_skb_any(ack_skb); 460 } 461 } 462 } 463 } 464 465 /* 466 * Use a static threshold for now, best value to be determined 467 * by testing ... 468 * Should it depend on: 469 * - on # of retransmissions 470 * - current throughput (higher value for higher tpt)? 471 */ 472 #define STA_LOST_PKT_THRESHOLD 50 473 474 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 475 { 476 struct sk_buff *skb2; 477 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 478 struct ieee80211_local *local = hw_to_local(hw); 479 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 480 __le16 fc; 481 struct ieee80211_supported_band *sband; 482 struct ieee80211_sub_if_data *sdata; 483 struct net_device *prev_dev = NULL; 484 struct sta_info *sta, *tmp; 485 int retry_count = -1, i; 486 int rates_idx = -1; 487 bool send_to_cooked; 488 bool acked; 489 struct ieee80211_bar *bar; 490 int rtap_len; 491 int shift = 0; 492 493 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 494 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 495 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 496 /* just the first aggr frame carry status info */ 497 info->status.rates[i].idx = -1; 498 info->status.rates[i].count = 0; 499 break; 500 } else if (info->status.rates[i].idx < 0) { 501 break; 502 } else if (i >= hw->max_report_rates) { 503 /* the HW cannot have attempted that rate */ 504 info->status.rates[i].idx = -1; 505 info->status.rates[i].count = 0; 506 break; 507 } 508 509 retry_count += info->status.rates[i].count; 510 } 511 rates_idx = i - 1; 512 513 if (retry_count < 0) 514 retry_count = 0; 515 516 rcu_read_lock(); 517 518 sband = local->hw.wiphy->bands[info->band]; 519 fc = hdr->frame_control; 520 521 for_each_sta_info(local, hdr->addr1, sta, tmp) { 522 /* skip wrong virtual interface */ 523 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 524 continue; 525 526 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 527 528 if (info->flags & IEEE80211_TX_STATUS_EOSP) 529 clear_sta_flag(sta, WLAN_STA_SP); 530 531 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 532 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 533 /* 534 * The STA is in power save mode, so assume 535 * that this TX packet failed because of that. 536 */ 537 ieee80211_handle_filtered_frame(local, sta, skb); 538 rcu_read_unlock(); 539 return; 540 } 541 542 /* mesh Peer Service Period support */ 543 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 544 ieee80211_is_data_qos(fc)) 545 ieee80211_mpsp_trigger_process( 546 ieee80211_get_qos_ctl(hdr), 547 sta, true, acked); 548 549 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 550 (rates_idx != -1)) 551 sta->last_tx_rate = info->status.rates[rates_idx]; 552 553 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 554 (ieee80211_is_data_qos(fc))) { 555 u16 tid, ssn; 556 u8 *qc; 557 558 qc = ieee80211_get_qos_ctl(hdr); 559 tid = qc[0] & 0xf; 560 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 561 & IEEE80211_SCTL_SEQ); 562 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 563 tid, ssn); 564 } 565 566 if (!acked && ieee80211_is_back_req(fc)) { 567 u16 tid, control; 568 569 /* 570 * BAR failed, store the last SSN and retry sending 571 * the BAR when the next unicast transmission on the 572 * same TID succeeds. 573 */ 574 bar = (struct ieee80211_bar *) skb->data; 575 control = le16_to_cpu(bar->control); 576 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 577 u16 ssn = le16_to_cpu(bar->start_seq_num); 578 579 tid = (control & 580 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 581 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 582 583 ieee80211_set_bar_pending(sta, tid, ssn); 584 } 585 } 586 587 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 588 ieee80211_handle_filtered_frame(local, sta, skb); 589 rcu_read_unlock(); 590 return; 591 } else { 592 if (!acked) 593 sta->tx_retry_failed++; 594 sta->tx_retry_count += retry_count; 595 } 596 597 rate_control_tx_status(local, sband, sta, skb); 598 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 599 ieee80211s_update_metric(local, sta, skb); 600 601 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 602 ieee80211_frame_acked(sta, skb); 603 604 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 605 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 606 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked); 607 608 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 609 if (info->flags & IEEE80211_TX_STAT_ACK) { 610 if (sta->lost_packets) 611 sta->lost_packets = 0; 612 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) { 613 cfg80211_cqm_pktloss_notify(sta->sdata->dev, 614 sta->sta.addr, 615 sta->lost_packets, 616 GFP_ATOMIC); 617 sta->lost_packets = 0; 618 } 619 } 620 621 if (acked) 622 sta->last_ack_signal = info->status.ack_signal; 623 } 624 625 rcu_read_unlock(); 626 627 ieee80211_led_tx(local); 628 629 /* SNMP counters 630 * Fragments are passed to low-level drivers as separate skbs, so these 631 * are actually fragments, not frames. Update frame counters only for 632 * the first fragment of the frame. */ 633 if (info->flags & IEEE80211_TX_STAT_ACK) { 634 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 635 local->dot11TransmittedFrameCount++; 636 if (is_multicast_ether_addr(hdr->addr1)) 637 local->dot11MulticastTransmittedFrameCount++; 638 if (retry_count > 0) 639 local->dot11RetryCount++; 640 if (retry_count > 1) 641 local->dot11MultipleRetryCount++; 642 } 643 644 /* This counter shall be incremented for an acknowledged MPDU 645 * with an individual address in the address 1 field or an MPDU 646 * with a multicast address in the address 1 field of type Data 647 * or Management. */ 648 if (!is_multicast_ether_addr(hdr->addr1) || 649 ieee80211_is_data(fc) || 650 ieee80211_is_mgmt(fc)) 651 local->dot11TransmittedFragmentCount++; 652 } else { 653 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 654 local->dot11FailedCount++; 655 } 656 657 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 658 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 659 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 660 local->ps_sdata && !(local->scanning)) { 661 if (info->flags & IEEE80211_TX_STAT_ACK) { 662 local->ps_sdata->u.mgd.flags |= 663 IEEE80211_STA_NULLFUNC_ACKED; 664 } else 665 mod_timer(&local->dynamic_ps_timer, jiffies + 666 msecs_to_jiffies(10)); 667 } 668 669 ieee80211_report_used_skb(local, skb, false); 670 671 /* this was a transmitted frame, but now we want to reuse it */ 672 skb_orphan(skb); 673 674 /* Need to make a copy before skb->cb gets cleared */ 675 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 676 !(ieee80211_is_data(fc)); 677 678 /* 679 * This is a bit racy but we can avoid a lot of work 680 * with this test... 681 */ 682 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 683 dev_kfree_skb(skb); 684 return; 685 } 686 687 /* send frame to monitor interfaces now */ 688 rtap_len = ieee80211_tx_radiotap_len(info); 689 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 690 pr_err("ieee80211_tx_status: headroom too small\n"); 691 dev_kfree_skb(skb); 692 return; 693 } 694 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 695 rtap_len, shift); 696 697 /* XXX: is this sufficient for BPF? */ 698 skb_set_mac_header(skb, 0); 699 skb->ip_summed = CHECKSUM_UNNECESSARY; 700 skb->pkt_type = PACKET_OTHERHOST; 701 skb->protocol = htons(ETH_P_802_2); 702 memset(skb->cb, 0, sizeof(skb->cb)); 703 704 rcu_read_lock(); 705 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 706 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 707 if (!ieee80211_sdata_running(sdata)) 708 continue; 709 710 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 711 !send_to_cooked) 712 continue; 713 714 if (prev_dev) { 715 skb2 = skb_clone(skb, GFP_ATOMIC); 716 if (skb2) { 717 skb2->dev = prev_dev; 718 netif_rx(skb2); 719 } 720 } 721 722 prev_dev = sdata->dev; 723 } 724 } 725 if (prev_dev) { 726 skb->dev = prev_dev; 727 netif_rx(skb); 728 skb = NULL; 729 } 730 rcu_read_unlock(); 731 dev_kfree_skb(skb); 732 } 733 EXPORT_SYMBOL(ieee80211_tx_status); 734 735 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 736 { 737 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 738 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 739 num_packets, GFP_ATOMIC); 740 } 741 EXPORT_SYMBOL(ieee80211_report_low_ack); 742 743 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 744 { 745 struct ieee80211_local *local = hw_to_local(hw); 746 747 ieee80211_report_used_skb(local, skb, true); 748 dev_kfree_skb_any(skb); 749 } 750 EXPORT_SYMBOL(ieee80211_free_txskb); 751 752 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 753 struct sk_buff_head *skbs) 754 { 755 struct sk_buff *skb; 756 757 while ((skb = __skb_dequeue(skbs))) 758 ieee80211_free_txskb(hw, skb); 759 } 760