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_TX_CTL_AMPDU)) { 56 ieee80211_free_txskb(&local->hw, skb); 57 return; 58 } 59 60 /* 61 * This skb 'survived' a round-trip through the driver, and 62 * hopefully the driver didn't mangle it too badly. However, 63 * we can definitely not rely on the control information 64 * being correct. Clear it so we don't get junk there, and 65 * indicate that it needs new processing, but must not be 66 * modified/encrypted again. 67 */ 68 memset(&info->control, 0, sizeof(info->control)); 69 70 info->control.jiffies = jiffies; 71 info->control.vif = &sta->sdata->vif; 72 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 73 IEEE80211_TX_INTFL_RETRANSMISSION; 74 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 75 76 sta->status_stats.filtered++; 77 78 /* 79 * Clear more-data bit on filtered frames, it might be set 80 * but later frames might time out so it might have to be 81 * clear again ... It's all rather unlikely (this frame 82 * should time out first, right?) but let's not confuse 83 * peers unnecessarily. 84 */ 85 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 86 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 87 88 if (ieee80211_is_data_qos(hdr->frame_control)) { 89 u8 *p = ieee80211_get_qos_ctl(hdr); 90 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 91 92 /* 93 * Clear EOSP if set, this could happen e.g. 94 * if an absence period (us being a P2P GO) 95 * shortens the SP. 96 */ 97 if (*p & IEEE80211_QOS_CTL_EOSP) 98 *p &= ~IEEE80211_QOS_CTL_EOSP; 99 ac = ieee80211_ac_from_tid(tid); 100 } else { 101 ac = IEEE80211_AC_BE; 102 } 103 104 /* 105 * Clear the TX filter mask for this STA when sending the next 106 * packet. If the STA went to power save mode, this will happen 107 * when it wakes up for the next time. 108 */ 109 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 110 ieee80211_clear_fast_xmit(sta); 111 112 /* 113 * This code races in the following way: 114 * 115 * (1) STA sends frame indicating it will go to sleep and does so 116 * (2) hardware/firmware adds STA to filter list, passes frame up 117 * (3) hardware/firmware processes TX fifo and suppresses a frame 118 * (4) we get TX status before having processed the frame and 119 * knowing that the STA has gone to sleep. 120 * 121 * This is actually quite unlikely even when both those events are 122 * processed from interrupts coming in quickly after one another or 123 * even at the same time because we queue both TX status events and 124 * RX frames to be processed by a tasklet and process them in the 125 * same order that they were received or TX status last. Hence, there 126 * is no race as long as the frame RX is processed before the next TX 127 * status, which drivers can ensure, see below. 128 * 129 * Note that this can only happen if the hardware or firmware can 130 * actually add STAs to the filter list, if this is done by the 131 * driver in response to set_tim() (which will only reduce the race 132 * this whole filtering tries to solve, not completely solve it) 133 * this situation cannot happen. 134 * 135 * To completely solve this race drivers need to make sure that they 136 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 137 * functions and 138 * (b) always process RX events before TX status events if ordering 139 * can be unknown, for example with different interrupt status 140 * bits. 141 * (c) if PS mode transitions are manual (i.e. the flag 142 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 143 * changes before calling TX status events if ordering can be 144 * unknown. 145 */ 146 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 147 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 148 skb_queue_tail(&sta->tx_filtered[ac], skb); 149 sta_info_recalc_tim(sta); 150 151 if (!timer_pending(&local->sta_cleanup)) 152 mod_timer(&local->sta_cleanup, 153 round_jiffies(jiffies + 154 STA_INFO_CLEANUP_INTERVAL)); 155 return; 156 } 157 158 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 159 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 160 /* Software retry the packet once */ 161 info->flags |= IEEE80211_TX_INTFL_RETRIED; 162 ieee80211_add_pending_skb(local, skb); 163 return; 164 } 165 166 ps_dbg_ratelimited(sta->sdata, 167 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 168 skb_queue_len(&sta->tx_filtered[ac]), 169 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 170 ieee80211_free_txskb(&local->hw, skb); 171 } 172 173 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 174 { 175 struct tid_ampdu_tx *tid_tx; 176 177 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 178 if (!tid_tx || !tid_tx->bar_pending) 179 return; 180 181 tid_tx->bar_pending = false; 182 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 183 } 184 185 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 186 { 187 struct ieee80211_mgmt *mgmt = (void *) skb->data; 188 struct ieee80211_local *local = sta->local; 189 struct ieee80211_sub_if_data *sdata = sta->sdata; 190 191 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 192 sta->status_stats.last_ack = jiffies; 193 194 if (ieee80211_is_data_qos(mgmt->frame_control)) { 195 struct ieee80211_hdr *hdr = (void *) skb->data; 196 u8 *qc = ieee80211_get_qos_ctl(hdr); 197 u16 tid = qc[0] & 0xf; 198 199 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 200 } 201 202 if (ieee80211_is_action(mgmt->frame_control) && 203 mgmt->u.action.category == WLAN_CATEGORY_HT && 204 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 205 ieee80211_sdata_running(sdata)) { 206 enum ieee80211_smps_mode smps_mode; 207 208 switch (mgmt->u.action.u.ht_smps.smps_control) { 209 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 210 smps_mode = IEEE80211_SMPS_DYNAMIC; 211 break; 212 case WLAN_HT_SMPS_CONTROL_STATIC: 213 smps_mode = IEEE80211_SMPS_STATIC; 214 break; 215 case WLAN_HT_SMPS_CONTROL_DISABLED: 216 default: /* shouldn't happen since we don't send that */ 217 smps_mode = IEEE80211_SMPS_OFF; 218 break; 219 } 220 221 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 222 /* 223 * This update looks racy, but isn't -- if we come 224 * here we've definitely got a station that we're 225 * talking to, and on a managed interface that can 226 * only be the AP. And the only other place updating 227 * this variable in managed mode is before association. 228 */ 229 sdata->smps_mode = smps_mode; 230 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 231 } else if (sdata->vif.type == NL80211_IFTYPE_AP || 232 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 233 sta->known_smps_mode = smps_mode; 234 } 235 } 236 } 237 238 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 239 { 240 struct tid_ampdu_tx *tid_tx; 241 242 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 243 if (!tid_tx) 244 return; 245 246 tid_tx->failed_bar_ssn = ssn; 247 tid_tx->bar_pending = true; 248 } 249 250 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 251 { 252 int len = sizeof(struct ieee80211_radiotap_header); 253 254 /* IEEE80211_RADIOTAP_RATE rate */ 255 if (info->status.rates[0].idx >= 0 && 256 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 257 IEEE80211_TX_RC_VHT_MCS))) 258 len += 2; 259 260 /* IEEE80211_RADIOTAP_TX_FLAGS */ 261 len += 2; 262 263 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 264 len += 1; 265 266 /* IEEE80211_RADIOTAP_MCS 267 * IEEE80211_RADIOTAP_VHT */ 268 if (info->status.rates[0].idx >= 0) { 269 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 270 len += 3; 271 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 272 len = ALIGN(len, 2) + 12; 273 } 274 275 return len; 276 } 277 278 static void 279 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 280 struct ieee80211_supported_band *sband, 281 struct sk_buff *skb, int retry_count, 282 int rtap_len, int shift) 283 { 284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 286 struct ieee80211_radiotap_header *rthdr; 287 unsigned char *pos; 288 u16 txflags; 289 290 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 291 292 memset(rthdr, 0, rtap_len); 293 rthdr->it_len = cpu_to_le16(rtap_len); 294 rthdr->it_present = 295 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 296 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 297 pos = (unsigned char *)(rthdr + 1); 298 299 /* 300 * XXX: Once radiotap gets the bitmap reset thing the vendor 301 * extensions proposal contains, we can actually report 302 * the whole set of tries we did. 303 */ 304 305 /* IEEE80211_RADIOTAP_RATE */ 306 if (info->status.rates[0].idx >= 0 && 307 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 308 IEEE80211_TX_RC_VHT_MCS))) { 309 u16 rate; 310 311 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 312 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 313 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 314 /* padding for tx flags */ 315 pos += 2; 316 } 317 318 /* IEEE80211_RADIOTAP_TX_FLAGS */ 319 txflags = 0; 320 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 321 !is_multicast_ether_addr(hdr->addr1)) 322 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 323 324 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) 325 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 326 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 327 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 328 329 put_unaligned_le16(txflags, pos); 330 pos += 2; 331 332 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 333 /* for now report the total retry_count */ 334 *pos = retry_count; 335 pos++; 336 337 if (info->status.rates[0].idx < 0) 338 return; 339 340 /* IEEE80211_RADIOTAP_MCS 341 * IEEE80211_RADIOTAP_VHT */ 342 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 343 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 344 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 345 IEEE80211_RADIOTAP_MCS_HAVE_GI | 346 IEEE80211_RADIOTAP_MCS_HAVE_BW; 347 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 348 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 349 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 350 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 351 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 352 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 353 pos[2] = info->status.rates[0].idx; 354 pos += 3; 355 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { 356 u16 known = local->hw.radiotap_vht_details & 357 (IEEE80211_RADIOTAP_VHT_KNOWN_GI | 358 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); 359 360 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 361 362 /* required alignment from rthdr */ 363 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); 364 365 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ 366 put_unaligned_le16(known, pos); 367 pos += 2; 368 369 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ 370 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 371 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 372 pos++; 373 374 /* u8 bandwidth */ 375 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 376 *pos = 1; 377 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 378 *pos = 4; 379 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 380 *pos = 11; 381 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ 382 *pos = 0; 383 pos++; 384 385 /* u8 mcs_nss[4] */ 386 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | 387 ieee80211_rate_get_vht_nss(&info->status.rates[0]); 388 pos += 4; 389 390 /* u8 coding */ 391 pos++; 392 /* u8 group_id */ 393 pos++; 394 /* u16 partial_aid */ 395 pos += 2; 396 } 397 } 398 399 /* 400 * Handles the tx for TDLS teardown frames. 401 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP 402 */ 403 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local, 404 struct ieee80211_sub_if_data *sdata, 405 struct sk_buff *skb, u32 flags) 406 { 407 struct sk_buff *teardown_skb; 408 struct sk_buff *orig_teardown_skb; 409 bool is_teardown = false; 410 411 /* Get the teardown data we need and free the lock */ 412 spin_lock(&sdata->u.mgd.teardown_lock); 413 teardown_skb = sdata->u.mgd.teardown_skb; 414 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb; 415 if ((skb == orig_teardown_skb) && teardown_skb) { 416 sdata->u.mgd.teardown_skb = NULL; 417 sdata->u.mgd.orig_teardown_skb = NULL; 418 is_teardown = true; 419 } 420 spin_unlock(&sdata->u.mgd.teardown_lock); 421 422 if (is_teardown) { 423 /* This mechanism relies on being able to get ACKs */ 424 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)); 425 426 /* Check if peer has ACKed */ 427 if (flags & IEEE80211_TX_STAT_ACK) { 428 dev_kfree_skb_any(teardown_skb); 429 } else { 430 tdls_dbg(sdata, 431 "TDLS Resending teardown through AP\n"); 432 433 ieee80211_subif_start_xmit(teardown_skb, skb->dev); 434 } 435 } 436 } 437 438 static struct ieee80211_sub_if_data * 439 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb) 440 { 441 struct ieee80211_sub_if_data *sdata; 442 443 if (skb->dev) { 444 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 445 if (!sdata->dev) 446 continue; 447 448 if (skb->dev == sdata->dev) 449 return sdata; 450 } 451 452 return NULL; 453 } 454 455 return rcu_dereference(local->p2p_sdata); 456 } 457 458 static void ieee80211_report_ack_skb(struct ieee80211_local *local, 459 struct ieee80211_tx_info *info, 460 bool acked, bool dropped) 461 { 462 struct sk_buff *skb; 463 unsigned long flags; 464 465 spin_lock_irqsave(&local->ack_status_lock, flags); 466 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id); 467 spin_unlock_irqrestore(&local->ack_status_lock, flags); 468 469 if (!skb) 470 return; 471 472 if (dropped) { 473 dev_kfree_skb_any(skb); 474 return; 475 } 476 477 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) { 478 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie; 479 struct ieee80211_sub_if_data *sdata; 480 struct ieee80211_hdr *hdr = (void *)skb->data; 481 482 rcu_read_lock(); 483 sdata = ieee80211_sdata_from_skb(local, skb); 484 if (sdata) { 485 if (ieee80211_is_nullfunc(hdr->frame_control) || 486 ieee80211_is_qos_nullfunc(hdr->frame_control)) 487 cfg80211_probe_status(sdata->dev, hdr->addr1, 488 cookie, acked, 489 GFP_ATOMIC); 490 else 491 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, 492 skb->data, skb->len, 493 acked, GFP_ATOMIC); 494 } 495 rcu_read_unlock(); 496 497 dev_kfree_skb_any(skb); 498 } else { 499 /* consumes skb */ 500 skb_complete_wifi_ack(skb, acked); 501 } 502 } 503 504 static void ieee80211_report_used_skb(struct ieee80211_local *local, 505 struct sk_buff *skb, bool dropped) 506 { 507 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 508 struct ieee80211_hdr *hdr = (void *)skb->data; 509 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 510 511 if (dropped) 512 acked = false; 513 514 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 515 struct ieee80211_sub_if_data *sdata; 516 517 rcu_read_lock(); 518 519 sdata = ieee80211_sdata_from_skb(local, skb); 520 521 if (!sdata) { 522 skb->dev = NULL; 523 } else { 524 unsigned int hdr_size = 525 ieee80211_hdrlen(hdr->frame_control); 526 527 /* Check to see if packet is a TDLS teardown packet */ 528 if (ieee80211_is_data(hdr->frame_control) && 529 (ieee80211_get_tdls_action(skb, hdr_size) == 530 WLAN_TDLS_TEARDOWN)) 531 ieee80211_tdls_td_tx_handle(local, sdata, skb, 532 info->flags); 533 else 534 ieee80211_mgd_conn_tx_status(sdata, 535 hdr->frame_control, 536 acked); 537 } 538 539 rcu_read_unlock(); 540 } else if (info->ack_frame_id) { 541 ieee80211_report_ack_skb(local, info, acked, dropped); 542 } 543 544 if (!dropped && skb->destructor) { 545 skb->wifi_acked_valid = 1; 546 skb->wifi_acked = acked; 547 } 548 } 549 550 /* 551 * Use a static threshold for now, best value to be determined 552 * by testing ... 553 * Should it depend on: 554 * - on # of retransmissions 555 * - current throughput (higher value for higher tpt)? 556 */ 557 #define STA_LOST_PKT_THRESHOLD 50 558 #define STA_LOST_TDLS_PKT_THRESHOLD 10 559 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */ 560 561 static void ieee80211_lost_packet(struct sta_info *sta, 562 struct ieee80211_tx_info *info) 563 { 564 /* If driver relies on its own algorithm for station kickout, skip 565 * mac80211 packet loss mechanism. 566 */ 567 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK)) 568 return; 569 570 /* This packet was aggregated but doesn't carry status info */ 571 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 572 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 573 return; 574 575 sta->status_stats.lost_packets++; 576 if (!sta->sta.tdls && 577 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD) 578 return; 579 580 /* 581 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD 582 * of the last packets were lost, and that no ACK was received in the 583 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss 584 * mechanism. 585 */ 586 if (sta->sta.tdls && 587 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD || 588 time_before(jiffies, 589 sta->status_stats.last_tdls_pkt_time + 590 STA_LOST_TDLS_PKT_TIME))) 591 return; 592 593 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 594 sta->status_stats.lost_packets, GFP_ATOMIC); 595 sta->status_stats.lost_packets = 0; 596 } 597 598 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw, 599 struct ieee80211_tx_info *info, 600 int *retry_count) 601 { 602 int rates_idx = -1; 603 int count = -1; 604 int i; 605 606 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 607 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 608 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 609 /* just the first aggr frame carry status info */ 610 info->status.rates[i].idx = -1; 611 info->status.rates[i].count = 0; 612 break; 613 } else if (info->status.rates[i].idx < 0) { 614 break; 615 } else if (i >= hw->max_report_rates) { 616 /* the HW cannot have attempted that rate */ 617 info->status.rates[i].idx = -1; 618 info->status.rates[i].count = 0; 619 break; 620 } 621 622 count += info->status.rates[i].count; 623 } 624 rates_idx = i - 1; 625 626 if (count < 0) 627 count = 0; 628 629 *retry_count = count; 630 return rates_idx; 631 } 632 633 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw, 634 struct ieee80211_sta *pubsta, 635 struct ieee80211_tx_info *info) 636 { 637 struct ieee80211_local *local = hw_to_local(hw); 638 struct ieee80211_supported_band *sband; 639 int retry_count; 640 bool acked, noack_success; 641 642 ieee80211_tx_get_rates(hw, info, &retry_count); 643 644 sband = hw->wiphy->bands[info->band]; 645 646 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 647 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED); 648 649 if (pubsta) { 650 struct sta_info *sta; 651 652 sta = container_of(pubsta, struct sta_info, sta); 653 654 if (!acked) 655 sta->status_stats.retry_failed++; 656 sta->status_stats.retry_count += retry_count; 657 658 if (acked) { 659 sta->status_stats.last_ack = jiffies; 660 661 if (sta->status_stats.lost_packets) 662 sta->status_stats.lost_packets = 0; 663 664 /* Track when last TDLS packet was ACKed */ 665 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 666 sta->status_stats.last_tdls_pkt_time = jiffies; 667 } else { 668 ieee80211_lost_packet(sta, info); 669 } 670 671 rate_control_tx_status_noskb(local, sband, sta, info); 672 } 673 674 if (acked || noack_success) { 675 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 676 if (!pubsta) 677 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 678 if (retry_count > 0) 679 I802_DEBUG_INC(local->dot11RetryCount); 680 if (retry_count > 1) 681 I802_DEBUG_INC(local->dot11MultipleRetryCount); 682 } else { 683 I802_DEBUG_INC(local->dot11FailedCount); 684 } 685 } 686 EXPORT_SYMBOL(ieee80211_tx_status_noskb); 687 688 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb, 689 struct ieee80211_supported_band *sband, 690 int retry_count, int shift, bool send_to_cooked) 691 { 692 struct sk_buff *skb2; 693 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 694 struct ieee80211_sub_if_data *sdata; 695 struct net_device *prev_dev = NULL; 696 int rtap_len; 697 698 /* send frame to monitor interfaces now */ 699 rtap_len = ieee80211_tx_radiotap_len(info); 700 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 701 pr_err("ieee80211_tx_status: headroom too small\n"); 702 dev_kfree_skb(skb); 703 return; 704 } 705 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 706 rtap_len, shift); 707 708 /* XXX: is this sufficient for BPF? */ 709 skb_reset_mac_header(skb); 710 skb->ip_summed = CHECKSUM_UNNECESSARY; 711 skb->pkt_type = PACKET_OTHERHOST; 712 skb->protocol = htons(ETH_P_802_2); 713 memset(skb->cb, 0, sizeof(skb->cb)); 714 715 rcu_read_lock(); 716 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 717 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 718 if (!ieee80211_sdata_running(sdata)) 719 continue; 720 721 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) && 722 !send_to_cooked) 723 continue; 724 725 if (prev_dev) { 726 skb2 = skb_clone(skb, GFP_ATOMIC); 727 if (skb2) { 728 skb2->dev = prev_dev; 729 netif_rx(skb2); 730 } 731 } 732 733 prev_dev = sdata->dev; 734 } 735 } 736 if (prev_dev) { 737 skb->dev = prev_dev; 738 netif_rx(skb); 739 skb = NULL; 740 } 741 rcu_read_unlock(); 742 dev_kfree_skb(skb); 743 } 744 745 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 746 { 747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 748 struct ieee80211_local *local = hw_to_local(hw); 749 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 750 __le16 fc; 751 struct ieee80211_supported_band *sband; 752 struct rhlist_head *tmp; 753 struct sta_info *sta; 754 int retry_count; 755 int rates_idx; 756 bool send_to_cooked; 757 bool acked; 758 struct ieee80211_bar *bar; 759 int shift = 0; 760 int tid = IEEE80211_NUM_TIDS; 761 762 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 763 764 rcu_read_lock(); 765 766 sband = local->hw.wiphy->bands[info->band]; 767 fc = hdr->frame_control; 768 769 for_each_sta_info(local, hdr->addr1, sta, tmp) { 770 /* skip wrong virtual interface */ 771 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 772 continue; 773 774 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 775 776 if (info->flags & IEEE80211_TX_STATUS_EOSP) 777 clear_sta_flag(sta, WLAN_STA_SP); 778 779 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 780 781 /* mesh Peer Service Period support */ 782 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 783 ieee80211_is_data_qos(fc)) 784 ieee80211_mpsp_trigger_process( 785 ieee80211_get_qos_ctl(hdr), sta, true, acked); 786 787 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 788 /* 789 * The STA is in power save mode, so assume 790 * that this TX packet failed because of that. 791 */ 792 ieee80211_handle_filtered_frame(local, sta, skb); 793 rcu_read_unlock(); 794 return; 795 } 796 797 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) && 798 (ieee80211_is_data(hdr->frame_control)) && 799 (rates_idx != -1)) 800 sta->tx_stats.last_rate = 801 info->status.rates[rates_idx]; 802 803 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 804 (ieee80211_is_data_qos(fc))) { 805 u16 ssn; 806 u8 *qc; 807 808 qc = ieee80211_get_qos_ctl(hdr); 809 tid = qc[0] & 0xf; 810 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 811 & IEEE80211_SCTL_SEQ); 812 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 813 tid, ssn); 814 } else if (ieee80211_is_data_qos(fc)) { 815 u8 *qc = ieee80211_get_qos_ctl(hdr); 816 817 tid = qc[0] & 0xf; 818 } 819 820 if (!acked && ieee80211_is_back_req(fc)) { 821 u16 control; 822 823 /* 824 * BAR failed, store the last SSN and retry sending 825 * the BAR when the next unicast transmission on the 826 * same TID succeeds. 827 */ 828 bar = (struct ieee80211_bar *) skb->data; 829 control = le16_to_cpu(bar->control); 830 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 831 u16 ssn = le16_to_cpu(bar->start_seq_num); 832 833 tid = (control & 834 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 835 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 836 837 ieee80211_set_bar_pending(sta, tid, ssn); 838 } 839 } 840 841 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 842 ieee80211_handle_filtered_frame(local, sta, skb); 843 rcu_read_unlock(); 844 return; 845 } else { 846 if (!acked) 847 sta->status_stats.retry_failed++; 848 sta->status_stats.retry_count += retry_count; 849 850 if (ieee80211_is_data_present(fc)) { 851 if (!acked) 852 sta->status_stats.msdu_failed[tid]++; 853 854 sta->status_stats.msdu_retries[tid] += 855 retry_count; 856 } 857 } 858 859 rate_control_tx_status(local, sband, sta, skb); 860 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 861 ieee80211s_update_metric(local, sta, skb); 862 863 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 864 ieee80211_frame_acked(sta, skb); 865 866 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 867 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 868 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, 869 acked, info->status.tx_time); 870 871 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 872 if (info->flags & IEEE80211_TX_STAT_ACK) { 873 if (sta->status_stats.lost_packets) 874 sta->status_stats.lost_packets = 0; 875 876 /* Track when last TDLS packet was ACKed */ 877 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 878 sta->status_stats.last_tdls_pkt_time = 879 jiffies; 880 } else { 881 ieee80211_lost_packet(sta, info); 882 } 883 } 884 } 885 886 rcu_read_unlock(); 887 888 ieee80211_led_tx(local); 889 890 /* SNMP counters 891 * Fragments are passed to low-level drivers as separate skbs, so these 892 * are actually fragments, not frames. Update frame counters only for 893 * the first fragment of the frame. */ 894 if ((info->flags & IEEE80211_TX_STAT_ACK) || 895 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) { 896 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 897 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 898 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))) 899 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 900 if (retry_count > 0) 901 I802_DEBUG_INC(local->dot11RetryCount); 902 if (retry_count > 1) 903 I802_DEBUG_INC(local->dot11MultipleRetryCount); 904 } 905 906 /* This counter shall be incremented for an acknowledged MPDU 907 * with an individual address in the address 1 field or an MPDU 908 * with a multicast address in the address 1 field of type Data 909 * or Management. */ 910 if (!is_multicast_ether_addr(hdr->addr1) || 911 ieee80211_is_data(fc) || 912 ieee80211_is_mgmt(fc)) 913 I802_DEBUG_INC(local->dot11TransmittedFragmentCount); 914 } else { 915 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 916 I802_DEBUG_INC(local->dot11FailedCount); 917 } 918 919 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 920 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 921 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 922 local->ps_sdata && !(local->scanning)) { 923 if (info->flags & IEEE80211_TX_STAT_ACK) { 924 local->ps_sdata->u.mgd.flags |= 925 IEEE80211_STA_NULLFUNC_ACKED; 926 } else 927 mod_timer(&local->dynamic_ps_timer, jiffies + 928 msecs_to_jiffies(10)); 929 } 930 931 ieee80211_report_used_skb(local, skb, false); 932 933 /* this was a transmitted frame, but now we want to reuse it */ 934 skb_orphan(skb); 935 936 /* Need to make a copy before skb->cb gets cleared */ 937 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 938 !(ieee80211_is_data(fc)); 939 940 /* 941 * This is a bit racy but we can avoid a lot of work 942 * with this test... 943 */ 944 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 945 dev_kfree_skb(skb); 946 return; 947 } 948 949 /* send to monitor interfaces */ 950 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked); 951 } 952 EXPORT_SYMBOL(ieee80211_tx_status); 953 954 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 955 { 956 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 957 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 958 num_packets, GFP_ATOMIC); 959 } 960 EXPORT_SYMBOL(ieee80211_report_low_ack); 961 962 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 963 { 964 struct ieee80211_local *local = hw_to_local(hw); 965 966 ieee80211_report_used_skb(local, skb, true); 967 dev_kfree_skb_any(skb); 968 } 969 EXPORT_SYMBOL(ieee80211_free_txskb); 970 971 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 972 struct sk_buff_head *skbs) 973 { 974 struct sk_buff *skb; 975 976 while ((skb = __skb_dequeue(skbs))) 977 ieee80211_free_txskb(hw, skb); 978 } 979