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 /* 55 * This skb 'survived' a round-trip through the driver, and 56 * hopefully the driver didn't mangle it too badly. However, 57 * we can definitely not rely on the control information 58 * being correct. Clear it so we don't get junk there, and 59 * indicate that it needs new processing, but must not be 60 * modified/encrypted again. 61 */ 62 memset(&info->control, 0, sizeof(info->control)); 63 64 info->control.jiffies = jiffies; 65 info->control.vif = &sta->sdata->vif; 66 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 67 IEEE80211_TX_INTFL_RETRANSMISSION; 68 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 69 70 sta->tx_filtered_count++; 71 72 /* 73 * Clear more-data bit on filtered frames, it might be set 74 * but later frames might time out so it might have to be 75 * clear again ... It's all rather unlikely (this frame 76 * should time out first, right?) but let's not confuse 77 * peers unnecessarily. 78 */ 79 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 80 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 81 82 if (ieee80211_is_data_qos(hdr->frame_control)) { 83 u8 *p = ieee80211_get_qos_ctl(hdr); 84 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 85 86 /* 87 * Clear EOSP if set, this could happen e.g. 88 * if an absence period (us being a P2P GO) 89 * shortens the SP. 90 */ 91 if (*p & IEEE80211_QOS_CTL_EOSP) 92 *p &= ~IEEE80211_QOS_CTL_EOSP; 93 ac = ieee802_1d_to_ac[tid & 7]; 94 } else { 95 ac = IEEE80211_AC_BE; 96 } 97 98 /* 99 * Clear the TX filter mask for this STA when sending the next 100 * packet. If the STA went to power save mode, this will happen 101 * when it wakes up for the next time. 102 */ 103 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 104 105 /* 106 * This code races in the following way: 107 * 108 * (1) STA sends frame indicating it will go to sleep and does so 109 * (2) hardware/firmware adds STA to filter list, passes frame up 110 * (3) hardware/firmware processes TX fifo and suppresses a frame 111 * (4) we get TX status before having processed the frame and 112 * knowing that the STA has gone to sleep. 113 * 114 * This is actually quite unlikely even when both those events are 115 * processed from interrupts coming in quickly after one another or 116 * even at the same time because we queue both TX status events and 117 * RX frames to be processed by a tasklet and process them in the 118 * same order that they were received or TX status last. Hence, there 119 * is no race as long as the frame RX is processed before the next TX 120 * status, which drivers can ensure, see below. 121 * 122 * Note that this can only happen if the hardware or firmware can 123 * actually add STAs to the filter list, if this is done by the 124 * driver in response to set_tim() (which will only reduce the race 125 * this whole filtering tries to solve, not completely solve it) 126 * this situation cannot happen. 127 * 128 * To completely solve this race drivers need to make sure that they 129 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 130 * functions and 131 * (b) always process RX events before TX status events if ordering 132 * can be unknown, for example with different interrupt status 133 * bits. 134 * (c) if PS mode transitions are manual (i.e. the flag 135 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 136 * changes before calling TX status events if ordering can be 137 * unknown. 138 */ 139 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 140 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 141 skb_queue_tail(&sta->tx_filtered[ac], skb); 142 sta_info_recalc_tim(sta); 143 144 if (!timer_pending(&local->sta_cleanup)) 145 mod_timer(&local->sta_cleanup, 146 round_jiffies(jiffies + 147 STA_INFO_CLEANUP_INTERVAL)); 148 return; 149 } 150 151 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 152 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 153 /* Software retry the packet once */ 154 info->flags |= IEEE80211_TX_INTFL_RETRIED; 155 ieee80211_add_pending_skb(local, skb); 156 return; 157 } 158 159 ps_dbg_ratelimited(sta->sdata, 160 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 161 skb_queue_len(&sta->tx_filtered[ac]), 162 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 163 ieee80211_free_txskb(&local->hw, skb); 164 } 165 166 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 167 { 168 struct tid_ampdu_tx *tid_tx; 169 170 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 171 if (!tid_tx || !tid_tx->bar_pending) 172 return; 173 174 tid_tx->bar_pending = false; 175 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 176 } 177 178 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 179 { 180 struct ieee80211_mgmt *mgmt = (void *) skb->data; 181 struct ieee80211_local *local = sta->local; 182 struct ieee80211_sub_if_data *sdata = sta->sdata; 183 184 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) 185 sta->last_rx = jiffies; 186 187 if (ieee80211_is_data_qos(mgmt->frame_control)) { 188 struct ieee80211_hdr *hdr = (void *) skb->data; 189 u8 *qc = ieee80211_get_qos_ctl(hdr); 190 u16 tid = qc[0] & 0xf; 191 192 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 193 } 194 195 if (ieee80211_is_action(mgmt->frame_control) && 196 mgmt->u.action.category == WLAN_CATEGORY_HT && 197 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 198 ieee80211_sdata_running(sdata)) { 199 enum ieee80211_smps_mode smps_mode; 200 201 switch (mgmt->u.action.u.ht_smps.smps_control) { 202 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 203 smps_mode = IEEE80211_SMPS_DYNAMIC; 204 break; 205 case WLAN_HT_SMPS_CONTROL_STATIC: 206 smps_mode = IEEE80211_SMPS_STATIC; 207 break; 208 case WLAN_HT_SMPS_CONTROL_DISABLED: 209 default: /* shouldn't happen since we don't send that */ 210 smps_mode = IEEE80211_SMPS_OFF; 211 break; 212 } 213 214 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 215 /* 216 * This update looks racy, but isn't -- if we come 217 * here we've definitely got a station that we're 218 * talking to, and on a managed interface that can 219 * only be the AP. And the only other place updating 220 * this variable in managed mode is before association. 221 */ 222 sdata->smps_mode = smps_mode; 223 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 224 } else if (sdata->vif.type == NL80211_IFTYPE_AP || 225 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 226 sta->known_smps_mode = smps_mode; 227 } 228 } 229 } 230 231 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 232 { 233 struct tid_ampdu_tx *tid_tx; 234 235 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 236 if (!tid_tx) 237 return; 238 239 tid_tx->failed_bar_ssn = ssn; 240 tid_tx->bar_pending = true; 241 } 242 243 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 244 { 245 int len = sizeof(struct ieee80211_radiotap_header); 246 247 /* IEEE80211_RADIOTAP_RATE rate */ 248 if (info->status.rates[0].idx >= 0 && 249 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 250 IEEE80211_TX_RC_VHT_MCS))) 251 len += 2; 252 253 /* IEEE80211_RADIOTAP_TX_FLAGS */ 254 len += 2; 255 256 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 257 len += 1; 258 259 /* IEEE80211_RADIOTAP_MCS 260 * IEEE80211_RADIOTAP_VHT */ 261 if (info->status.rates[0].idx >= 0) { 262 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 263 len += 3; 264 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 265 len = ALIGN(len, 2) + 12; 266 } 267 268 return len; 269 } 270 271 static void 272 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 273 struct ieee80211_supported_band *sband, 274 struct sk_buff *skb, int retry_count, 275 int rtap_len, int shift) 276 { 277 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 278 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 279 struct ieee80211_radiotap_header *rthdr; 280 unsigned char *pos; 281 u16 txflags; 282 283 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 284 285 memset(rthdr, 0, rtap_len); 286 rthdr->it_len = cpu_to_le16(rtap_len); 287 rthdr->it_present = 288 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 289 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 290 pos = (unsigned char *)(rthdr + 1); 291 292 /* 293 * XXX: Once radiotap gets the bitmap reset thing the vendor 294 * extensions proposal contains, we can actually report 295 * the whole set of tries we did. 296 */ 297 298 /* IEEE80211_RADIOTAP_RATE */ 299 if (info->status.rates[0].idx >= 0 && 300 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 301 IEEE80211_TX_RC_VHT_MCS))) { 302 u16 rate; 303 304 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 305 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 306 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 307 /* padding for tx flags */ 308 pos += 2; 309 } 310 311 /* IEEE80211_RADIOTAP_TX_FLAGS */ 312 txflags = 0; 313 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 314 !is_multicast_ether_addr(hdr->addr1)) 315 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 316 317 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) 318 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 319 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 /* 393 * Handles the tx for TDLS teardown frames. 394 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP 395 */ 396 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local, 397 struct ieee80211_sub_if_data *sdata, 398 struct sk_buff *skb, u32 flags) 399 { 400 struct sk_buff *teardown_skb; 401 struct sk_buff *orig_teardown_skb; 402 bool is_teardown = false; 403 404 /* Get the teardown data we need and free the lock */ 405 spin_lock(&sdata->u.mgd.teardown_lock); 406 teardown_skb = sdata->u.mgd.teardown_skb; 407 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb; 408 if ((skb == orig_teardown_skb) && teardown_skb) { 409 sdata->u.mgd.teardown_skb = NULL; 410 sdata->u.mgd.orig_teardown_skb = NULL; 411 is_teardown = true; 412 } 413 spin_unlock(&sdata->u.mgd.teardown_lock); 414 415 if (is_teardown) { 416 /* This mechanism relies on being able to get ACKs */ 417 WARN_ON(!(local->hw.flags & 418 IEEE80211_HW_REPORTS_TX_ACK_STATUS)); 419 420 /* Check if peer has ACKed */ 421 if (flags & IEEE80211_TX_STAT_ACK) { 422 dev_kfree_skb_any(teardown_skb); 423 } else { 424 tdls_dbg(sdata, 425 "TDLS Resending teardown through AP\n"); 426 427 ieee80211_subif_start_xmit(teardown_skb, skb->dev); 428 } 429 } 430 } 431 432 static void ieee80211_report_used_skb(struct ieee80211_local *local, 433 struct sk_buff *skb, bool dropped) 434 { 435 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 436 struct ieee80211_hdr *hdr = (void *)skb->data; 437 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 438 439 if (dropped) 440 acked = false; 441 442 if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 443 IEEE80211_TX_INTFL_MLME_CONN_TX)) { 444 struct ieee80211_sub_if_data *sdata = NULL; 445 struct ieee80211_sub_if_data *iter_sdata; 446 u64 cookie = (unsigned long)skb; 447 448 rcu_read_lock(); 449 450 if (skb->dev) { 451 list_for_each_entry_rcu(iter_sdata, &local->interfaces, 452 list) { 453 if (!iter_sdata->dev) 454 continue; 455 456 if (skb->dev == iter_sdata->dev) { 457 sdata = iter_sdata; 458 break; 459 } 460 } 461 } else { 462 sdata = rcu_dereference(local->p2p_sdata); 463 } 464 465 if (!sdata) { 466 skb->dev = NULL; 467 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 468 unsigned int hdr_size = 469 ieee80211_hdrlen(hdr->frame_control); 470 471 /* Check to see if packet is a TDLS teardown packet */ 472 if (ieee80211_is_data(hdr->frame_control) && 473 (ieee80211_get_tdls_action(skb, hdr_size) == 474 WLAN_TDLS_TEARDOWN)) 475 ieee80211_tdls_td_tx_handle(local, sdata, skb, 476 info->flags); 477 else 478 ieee80211_mgd_conn_tx_status(sdata, 479 hdr->frame_control, 480 acked); 481 } else if (ieee80211_is_nullfunc(hdr->frame_control) || 482 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 483 cfg80211_probe_status(sdata->dev, hdr->addr1, 484 cookie, acked, GFP_ATOMIC); 485 } else { 486 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data, 487 skb->len, acked, GFP_ATOMIC); 488 } 489 490 rcu_read_unlock(); 491 } 492 493 if (unlikely(info->ack_frame_id)) { 494 struct sk_buff *ack_skb; 495 unsigned long flags; 496 497 spin_lock_irqsave(&local->ack_status_lock, flags); 498 ack_skb = idr_find(&local->ack_status_frames, 499 info->ack_frame_id); 500 if (ack_skb) 501 idr_remove(&local->ack_status_frames, 502 info->ack_frame_id); 503 spin_unlock_irqrestore(&local->ack_status_lock, flags); 504 505 if (ack_skb) { 506 if (!dropped) { 507 /* consumes ack_skb */ 508 skb_complete_wifi_ack(ack_skb, acked); 509 } else { 510 dev_kfree_skb_any(ack_skb); 511 } 512 } 513 } 514 } 515 516 /* 517 * Use a static threshold for now, best value to be determined 518 * by testing ... 519 * Should it depend on: 520 * - on # of retransmissions 521 * - current throughput (higher value for higher tpt)? 522 */ 523 #define STA_LOST_PKT_THRESHOLD 50 524 #define STA_LOST_TDLS_PKT_THRESHOLD 10 525 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */ 526 527 static void ieee80211_lost_packet(struct sta_info *sta, 528 struct ieee80211_tx_info *info) 529 { 530 /* This packet was aggregated but doesn't carry status info */ 531 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 532 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 533 return; 534 535 sta->lost_packets++; 536 if (!sta->sta.tdls && sta->lost_packets < STA_LOST_PKT_THRESHOLD) 537 return; 538 539 /* 540 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD 541 * of the last packets were lost, and that no ACK was received in the 542 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss 543 * mechanism. 544 */ 545 if (sta->sta.tdls && 546 (sta->lost_packets < STA_LOST_TDLS_PKT_THRESHOLD || 547 time_before(jiffies, 548 sta->last_tdls_pkt_time + STA_LOST_TDLS_PKT_TIME))) 549 return; 550 551 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 552 sta->lost_packets, GFP_ATOMIC); 553 sta->lost_packets = 0; 554 } 555 556 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw, 557 struct ieee80211_tx_info *info, 558 int *retry_count) 559 { 560 int rates_idx = -1; 561 int count = -1; 562 int i; 563 564 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 565 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 566 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 567 /* just the first aggr frame carry status info */ 568 info->status.rates[i].idx = -1; 569 info->status.rates[i].count = 0; 570 break; 571 } else if (info->status.rates[i].idx < 0) { 572 break; 573 } else if (i >= hw->max_report_rates) { 574 /* the HW cannot have attempted that rate */ 575 info->status.rates[i].idx = -1; 576 info->status.rates[i].count = 0; 577 break; 578 } 579 580 count += info->status.rates[i].count; 581 } 582 rates_idx = i - 1; 583 584 if (count < 0) 585 count = 0; 586 587 *retry_count = count; 588 return rates_idx; 589 } 590 591 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw, 592 struct ieee80211_sta *pubsta, 593 struct ieee80211_tx_info *info) 594 { 595 struct ieee80211_local *local = hw_to_local(hw); 596 struct ieee80211_supported_band *sband; 597 int retry_count; 598 int rates_idx; 599 bool acked, noack_success; 600 601 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 602 603 sband = hw->wiphy->bands[info->band]; 604 605 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 606 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED); 607 608 if (pubsta) { 609 struct sta_info *sta; 610 611 sta = container_of(pubsta, struct sta_info, sta); 612 613 if (!acked) 614 sta->tx_retry_failed++; 615 sta->tx_retry_count += retry_count; 616 617 if (acked) { 618 sta->last_rx = jiffies; 619 620 if (sta->lost_packets) 621 sta->lost_packets = 0; 622 623 /* Track when last TDLS packet was ACKed */ 624 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 625 sta->last_tdls_pkt_time = jiffies; 626 } else { 627 ieee80211_lost_packet(sta, info); 628 } 629 630 rate_control_tx_status_noskb(local, sband, sta, info); 631 } 632 633 if (acked || noack_success) { 634 local->dot11TransmittedFrameCount++; 635 if (!pubsta) 636 local->dot11MulticastTransmittedFrameCount++; 637 if (retry_count > 0) 638 local->dot11RetryCount++; 639 if (retry_count > 1) 640 local->dot11MultipleRetryCount++; 641 } else { 642 local->dot11FailedCount++; 643 } 644 } 645 EXPORT_SYMBOL(ieee80211_tx_status_noskb); 646 647 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 648 { 649 struct sk_buff *skb2; 650 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 651 struct ieee80211_local *local = hw_to_local(hw); 652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 653 __le16 fc; 654 struct ieee80211_supported_band *sband; 655 struct ieee80211_sub_if_data *sdata; 656 struct net_device *prev_dev = NULL; 657 struct sta_info *sta; 658 struct rhash_head *tmp; 659 int retry_count; 660 int rates_idx; 661 bool send_to_cooked; 662 bool acked; 663 struct ieee80211_bar *bar; 664 int rtap_len; 665 int shift = 0; 666 int tid = IEEE80211_NUM_TIDS; 667 const struct bucket_table *tbl; 668 669 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 670 671 rcu_read_lock(); 672 673 sband = local->hw.wiphy->bands[info->band]; 674 fc = hdr->frame_control; 675 676 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash); 677 678 for_each_sta_info(local, tbl, hdr->addr1, sta, tmp) { 679 /* skip wrong virtual interface */ 680 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 681 continue; 682 683 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 684 685 if (info->flags & IEEE80211_TX_STATUS_EOSP) 686 clear_sta_flag(sta, WLAN_STA_SP); 687 688 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 689 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 690 /* 691 * The STA is in power save mode, so assume 692 * that this TX packet failed because of that. 693 */ 694 ieee80211_handle_filtered_frame(local, sta, skb); 695 rcu_read_unlock(); 696 return; 697 } 698 699 /* mesh Peer Service Period support */ 700 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 701 ieee80211_is_data_qos(fc)) 702 ieee80211_mpsp_trigger_process( 703 ieee80211_get_qos_ctl(hdr), 704 sta, true, acked); 705 706 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 707 (ieee80211_is_data(hdr->frame_control)) && 708 (rates_idx != -1)) 709 sta->last_tx_rate = info->status.rates[rates_idx]; 710 711 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 712 (ieee80211_is_data_qos(fc))) { 713 u16 ssn; 714 u8 *qc; 715 716 qc = ieee80211_get_qos_ctl(hdr); 717 tid = qc[0] & 0xf; 718 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 719 & IEEE80211_SCTL_SEQ); 720 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 721 tid, ssn); 722 } else if (ieee80211_is_data_qos(fc)) { 723 u8 *qc = ieee80211_get_qos_ctl(hdr); 724 725 tid = qc[0] & 0xf; 726 } 727 728 if (!acked && ieee80211_is_back_req(fc)) { 729 u16 control; 730 731 /* 732 * BAR failed, store the last SSN and retry sending 733 * the BAR when the next unicast transmission on the 734 * same TID succeeds. 735 */ 736 bar = (struct ieee80211_bar *) skb->data; 737 control = le16_to_cpu(bar->control); 738 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 739 u16 ssn = le16_to_cpu(bar->start_seq_num); 740 741 tid = (control & 742 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 743 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 744 745 ieee80211_set_bar_pending(sta, tid, ssn); 746 } 747 } 748 749 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 750 ieee80211_handle_filtered_frame(local, sta, skb); 751 rcu_read_unlock(); 752 return; 753 } else { 754 if (!acked) 755 sta->tx_retry_failed++; 756 sta->tx_retry_count += retry_count; 757 758 if (ieee80211_is_data_present(fc)) { 759 if (!acked) 760 sta->tx_msdu_failed[tid]++; 761 sta->tx_msdu_retries[tid] += retry_count; 762 } 763 } 764 765 rate_control_tx_status(local, sband, sta, skb); 766 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 767 ieee80211s_update_metric(local, sta, skb); 768 769 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 770 ieee80211_frame_acked(sta, skb); 771 772 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 773 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 774 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, 775 acked, info->status.tx_time); 776 777 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 778 if (info->flags & IEEE80211_TX_STAT_ACK) { 779 if (sta->lost_packets) 780 sta->lost_packets = 0; 781 782 /* Track when last TDLS packet was ACKed */ 783 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 784 sta->last_tdls_pkt_time = jiffies; 785 } else { 786 ieee80211_lost_packet(sta, info); 787 } 788 } 789 790 if (acked) 791 sta->last_ack_signal = info->status.ack_signal; 792 } 793 794 rcu_read_unlock(); 795 796 ieee80211_led_tx(local); 797 798 /* SNMP counters 799 * Fragments are passed to low-level drivers as separate skbs, so these 800 * are actually fragments, not frames. Update frame counters only for 801 * the first fragment of the frame. */ 802 if ((info->flags & IEEE80211_TX_STAT_ACK) || 803 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) { 804 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 805 local->dot11TransmittedFrameCount++; 806 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))) 807 local->dot11MulticastTransmittedFrameCount++; 808 if (retry_count > 0) 809 local->dot11RetryCount++; 810 if (retry_count > 1) 811 local->dot11MultipleRetryCount++; 812 } 813 814 /* This counter shall be incremented for an acknowledged MPDU 815 * with an individual address in the address 1 field or an MPDU 816 * with a multicast address in the address 1 field of type Data 817 * or Management. */ 818 if (!is_multicast_ether_addr(hdr->addr1) || 819 ieee80211_is_data(fc) || 820 ieee80211_is_mgmt(fc)) 821 local->dot11TransmittedFragmentCount++; 822 } else { 823 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 824 local->dot11FailedCount++; 825 } 826 827 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 828 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 829 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 830 local->ps_sdata && !(local->scanning)) { 831 if (info->flags & IEEE80211_TX_STAT_ACK) { 832 local->ps_sdata->u.mgd.flags |= 833 IEEE80211_STA_NULLFUNC_ACKED; 834 } else 835 mod_timer(&local->dynamic_ps_timer, jiffies + 836 msecs_to_jiffies(10)); 837 } 838 839 ieee80211_report_used_skb(local, skb, false); 840 841 /* this was a transmitted frame, but now we want to reuse it */ 842 skb_orphan(skb); 843 844 /* Need to make a copy before skb->cb gets cleared */ 845 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 846 !(ieee80211_is_data(fc)); 847 848 /* 849 * This is a bit racy but we can avoid a lot of work 850 * with this test... 851 */ 852 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 853 dev_kfree_skb(skb); 854 return; 855 } 856 857 /* send frame to monitor interfaces now */ 858 rtap_len = ieee80211_tx_radiotap_len(info); 859 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 860 pr_err("ieee80211_tx_status: headroom too small\n"); 861 dev_kfree_skb(skb); 862 return; 863 } 864 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 865 rtap_len, shift); 866 867 /* XXX: is this sufficient for BPF? */ 868 skb_set_mac_header(skb, 0); 869 skb->ip_summed = CHECKSUM_UNNECESSARY; 870 skb->pkt_type = PACKET_OTHERHOST; 871 skb->protocol = htons(ETH_P_802_2); 872 memset(skb->cb, 0, sizeof(skb->cb)); 873 874 rcu_read_lock(); 875 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 876 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 877 if (!ieee80211_sdata_running(sdata)) 878 continue; 879 880 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 881 !send_to_cooked) 882 continue; 883 884 if (prev_dev) { 885 skb2 = skb_clone(skb, GFP_ATOMIC); 886 if (skb2) { 887 skb2->dev = prev_dev; 888 netif_rx(skb2); 889 } 890 } 891 892 prev_dev = sdata->dev; 893 } 894 } 895 if (prev_dev) { 896 skb->dev = prev_dev; 897 netif_rx(skb); 898 skb = NULL; 899 } 900 rcu_read_unlock(); 901 dev_kfree_skb(skb); 902 } 903 EXPORT_SYMBOL(ieee80211_tx_status); 904 905 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 906 { 907 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 908 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 909 num_packets, GFP_ATOMIC); 910 } 911 EXPORT_SYMBOL(ieee80211_report_low_ack); 912 913 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 914 { 915 struct ieee80211_local *local = hw_to_local(hw); 916 917 ieee80211_report_used_skb(local, skb, true); 918 dev_kfree_skb_any(skb); 919 } 920 EXPORT_SYMBOL(ieee80211_free_txskb); 921 922 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 923 struct sk_buff_head *skbs) 924 { 925 struct sk_buff *skb; 926 927 while ((skb = __skb_dequeue(skbs))) 928 ieee80211_free_txskb(hw, skb); 929 } 930