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 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); 191 192 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 193 sta->status_stats.last_ack = jiffies; 194 if (txinfo->status.is_valid_ack_signal) { 195 sta->status_stats.last_ack_signal = 196 (s8)txinfo->status.ack_signal; 197 sta->status_stats.ack_signal_filled = true; 198 ewma_avg_signal_add(&sta->status_stats.avg_ack_signal, 199 -txinfo->status.ack_signal); 200 } 201 } 202 203 if (ieee80211_is_data_qos(mgmt->frame_control)) { 204 struct ieee80211_hdr *hdr = (void *) skb->data; 205 u8 *qc = ieee80211_get_qos_ctl(hdr); 206 u16 tid = qc[0] & 0xf; 207 208 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 209 } 210 211 if (ieee80211_is_action(mgmt->frame_control) && 212 !ieee80211_has_protected(mgmt->frame_control) && 213 mgmt->u.action.category == WLAN_CATEGORY_HT && 214 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 215 ieee80211_sdata_running(sdata)) { 216 enum ieee80211_smps_mode smps_mode; 217 218 switch (mgmt->u.action.u.ht_smps.smps_control) { 219 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 220 smps_mode = IEEE80211_SMPS_DYNAMIC; 221 break; 222 case WLAN_HT_SMPS_CONTROL_STATIC: 223 smps_mode = IEEE80211_SMPS_STATIC; 224 break; 225 case WLAN_HT_SMPS_CONTROL_DISABLED: 226 default: /* shouldn't happen since we don't send that */ 227 smps_mode = IEEE80211_SMPS_OFF; 228 break; 229 } 230 231 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 232 /* 233 * This update looks racy, but isn't -- if we come 234 * here we've definitely got a station that we're 235 * talking to, and on a managed interface that can 236 * only be the AP. And the only other place updating 237 * this variable in managed mode is before association. 238 */ 239 sdata->smps_mode = smps_mode; 240 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 241 } else if (sdata->vif.type == NL80211_IFTYPE_AP || 242 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 243 sta->known_smps_mode = smps_mode; 244 } 245 } 246 } 247 248 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 249 { 250 struct tid_ampdu_tx *tid_tx; 251 252 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 253 if (!tid_tx) 254 return; 255 256 tid_tx->failed_bar_ssn = ssn; 257 tid_tx->bar_pending = true; 258 } 259 260 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 261 { 262 int len = sizeof(struct ieee80211_radiotap_header); 263 264 /* IEEE80211_RADIOTAP_RATE rate */ 265 if (info->status.rates[0].idx >= 0 && 266 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 267 IEEE80211_TX_RC_VHT_MCS))) 268 len += 2; 269 270 /* IEEE80211_RADIOTAP_TX_FLAGS */ 271 len += 2; 272 273 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 274 len += 1; 275 276 /* IEEE80211_RADIOTAP_MCS 277 * IEEE80211_RADIOTAP_VHT */ 278 if (info->status.rates[0].idx >= 0) { 279 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 280 len += 3; 281 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 282 len = ALIGN(len, 2) + 12; 283 } 284 285 return len; 286 } 287 288 static void 289 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 290 struct ieee80211_supported_band *sband, 291 struct sk_buff *skb, int retry_count, 292 int rtap_len, int shift) 293 { 294 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 295 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 296 struct ieee80211_radiotap_header *rthdr; 297 unsigned char *pos; 298 u16 txflags; 299 300 rthdr = skb_push(skb, rtap_len); 301 302 memset(rthdr, 0, rtap_len); 303 rthdr->it_len = cpu_to_le16(rtap_len); 304 rthdr->it_present = 305 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 306 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 307 pos = (unsigned char *)(rthdr + 1); 308 309 /* 310 * XXX: Once radiotap gets the bitmap reset thing the vendor 311 * extensions proposal contains, we can actually report 312 * the whole set of tries we did. 313 */ 314 315 /* IEEE80211_RADIOTAP_RATE */ 316 if (info->status.rates[0].idx >= 0 && 317 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 318 IEEE80211_TX_RC_VHT_MCS))) { 319 u16 rate; 320 321 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 322 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 323 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 324 /* padding for tx flags */ 325 pos += 2; 326 } 327 328 /* IEEE80211_RADIOTAP_TX_FLAGS */ 329 txflags = 0; 330 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 331 !is_multicast_ether_addr(hdr->addr1)) 332 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 333 334 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) 335 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 336 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 337 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 338 339 put_unaligned_le16(txflags, pos); 340 pos += 2; 341 342 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 343 /* for now report the total retry_count */ 344 *pos = retry_count; 345 pos++; 346 347 if (info->status.rates[0].idx < 0) 348 return; 349 350 /* IEEE80211_RADIOTAP_MCS 351 * IEEE80211_RADIOTAP_VHT */ 352 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 353 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 354 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 355 IEEE80211_RADIOTAP_MCS_HAVE_GI | 356 IEEE80211_RADIOTAP_MCS_HAVE_BW; 357 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 358 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 359 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 360 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 361 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 362 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 363 pos[2] = info->status.rates[0].idx; 364 pos += 3; 365 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { 366 u16 known = local->hw.radiotap_vht_details & 367 (IEEE80211_RADIOTAP_VHT_KNOWN_GI | 368 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); 369 370 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 371 372 /* required alignment from rthdr */ 373 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); 374 375 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ 376 put_unaligned_le16(known, pos); 377 pos += 2; 378 379 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ 380 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 381 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 382 pos++; 383 384 /* u8 bandwidth */ 385 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 386 *pos = 1; 387 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 388 *pos = 4; 389 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 390 *pos = 11; 391 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ 392 *pos = 0; 393 pos++; 394 395 /* u8 mcs_nss[4] */ 396 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | 397 ieee80211_rate_get_vht_nss(&info->status.rates[0]); 398 pos += 4; 399 400 /* u8 coding */ 401 pos++; 402 /* u8 group_id */ 403 pos++; 404 /* u16 partial_aid */ 405 pos += 2; 406 } 407 } 408 409 /* 410 * Handles the tx for TDLS teardown frames. 411 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP 412 */ 413 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local, 414 struct ieee80211_sub_if_data *sdata, 415 struct sk_buff *skb, u32 flags) 416 { 417 struct sk_buff *teardown_skb; 418 struct sk_buff *orig_teardown_skb; 419 bool is_teardown = false; 420 421 /* Get the teardown data we need and free the lock */ 422 spin_lock(&sdata->u.mgd.teardown_lock); 423 teardown_skb = sdata->u.mgd.teardown_skb; 424 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb; 425 if ((skb == orig_teardown_skb) && teardown_skb) { 426 sdata->u.mgd.teardown_skb = NULL; 427 sdata->u.mgd.orig_teardown_skb = NULL; 428 is_teardown = true; 429 } 430 spin_unlock(&sdata->u.mgd.teardown_lock); 431 432 if (is_teardown) { 433 /* This mechanism relies on being able to get ACKs */ 434 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)); 435 436 /* Check if peer has ACKed */ 437 if (flags & IEEE80211_TX_STAT_ACK) { 438 dev_kfree_skb_any(teardown_skb); 439 } else { 440 tdls_dbg(sdata, 441 "TDLS Resending teardown through AP\n"); 442 443 ieee80211_subif_start_xmit(teardown_skb, skb->dev); 444 } 445 } 446 } 447 448 static struct ieee80211_sub_if_data * 449 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb) 450 { 451 struct ieee80211_sub_if_data *sdata; 452 453 if (skb->dev) { 454 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 455 if (!sdata->dev) 456 continue; 457 458 if (skb->dev == sdata->dev) 459 return sdata; 460 } 461 462 return NULL; 463 } 464 465 return rcu_dereference(local->p2p_sdata); 466 } 467 468 static void ieee80211_report_ack_skb(struct ieee80211_local *local, 469 struct ieee80211_tx_info *info, 470 bool acked, bool dropped) 471 { 472 struct sk_buff *skb; 473 unsigned long flags; 474 475 spin_lock_irqsave(&local->ack_status_lock, flags); 476 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id); 477 spin_unlock_irqrestore(&local->ack_status_lock, flags); 478 479 if (!skb) 480 return; 481 482 if (dropped) { 483 dev_kfree_skb_any(skb); 484 return; 485 } 486 487 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) { 488 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie; 489 struct ieee80211_sub_if_data *sdata; 490 struct ieee80211_hdr *hdr = (void *)skb->data; 491 492 rcu_read_lock(); 493 sdata = ieee80211_sdata_from_skb(local, skb); 494 if (sdata) { 495 if (ieee80211_is_nullfunc(hdr->frame_control) || 496 ieee80211_is_qos_nullfunc(hdr->frame_control)) 497 cfg80211_probe_status(sdata->dev, hdr->addr1, 498 cookie, acked, 499 info->status.ack_signal, 500 info->status.is_valid_ack_signal, 501 GFP_ATOMIC); 502 else 503 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, 504 skb->data, skb->len, 505 acked, GFP_ATOMIC); 506 } 507 rcu_read_unlock(); 508 509 dev_kfree_skb_any(skb); 510 } else { 511 /* consumes skb */ 512 skb_complete_wifi_ack(skb, acked); 513 } 514 } 515 516 static void ieee80211_report_used_skb(struct ieee80211_local *local, 517 struct sk_buff *skb, bool dropped) 518 { 519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 520 struct ieee80211_hdr *hdr = (void *)skb->data; 521 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 522 523 if (dropped) 524 acked = false; 525 526 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 527 struct ieee80211_sub_if_data *sdata; 528 529 rcu_read_lock(); 530 531 sdata = ieee80211_sdata_from_skb(local, skb); 532 533 if (!sdata) { 534 skb->dev = NULL; 535 } else { 536 unsigned int hdr_size = 537 ieee80211_hdrlen(hdr->frame_control); 538 539 /* Check to see if packet is a TDLS teardown packet */ 540 if (ieee80211_is_data(hdr->frame_control) && 541 (ieee80211_get_tdls_action(skb, hdr_size) == 542 WLAN_TDLS_TEARDOWN)) 543 ieee80211_tdls_td_tx_handle(local, sdata, skb, 544 info->flags); 545 else 546 ieee80211_mgd_conn_tx_status(sdata, 547 hdr->frame_control, 548 acked); 549 } 550 551 rcu_read_unlock(); 552 } else if (info->ack_frame_id) { 553 ieee80211_report_ack_skb(local, info, acked, dropped); 554 } 555 556 if (!dropped && skb->destructor) { 557 skb->wifi_acked_valid = 1; 558 skb->wifi_acked = acked; 559 } 560 561 ieee80211_led_tx(local); 562 } 563 564 /* 565 * Use a static threshold for now, best value to be determined 566 * by testing ... 567 * Should it depend on: 568 * - on # of retransmissions 569 * - current throughput (higher value for higher tpt)? 570 */ 571 #define STA_LOST_PKT_THRESHOLD 50 572 #define STA_LOST_TDLS_PKT_THRESHOLD 10 573 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */ 574 575 static void ieee80211_lost_packet(struct sta_info *sta, 576 struct ieee80211_tx_info *info) 577 { 578 /* If driver relies on its own algorithm for station kickout, skip 579 * mac80211 packet loss mechanism. 580 */ 581 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK)) 582 return; 583 584 /* This packet was aggregated but doesn't carry status info */ 585 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 586 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 587 return; 588 589 sta->status_stats.lost_packets++; 590 if (!sta->sta.tdls && 591 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD) 592 return; 593 594 /* 595 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD 596 * of the last packets were lost, and that no ACK was received in the 597 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss 598 * mechanism. 599 */ 600 if (sta->sta.tdls && 601 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD || 602 time_before(jiffies, 603 sta->status_stats.last_tdls_pkt_time + 604 STA_LOST_TDLS_PKT_TIME))) 605 return; 606 607 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 608 sta->status_stats.lost_packets, GFP_ATOMIC); 609 sta->status_stats.lost_packets = 0; 610 } 611 612 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw, 613 struct ieee80211_tx_info *info, 614 int *retry_count) 615 { 616 int rates_idx = -1; 617 int count = -1; 618 int i; 619 620 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 621 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 622 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 623 /* just the first aggr frame carry status info */ 624 info->status.rates[i].idx = -1; 625 info->status.rates[i].count = 0; 626 break; 627 } else if (info->status.rates[i].idx < 0) { 628 break; 629 } else if (i >= hw->max_report_rates) { 630 /* the HW cannot have attempted that rate */ 631 info->status.rates[i].idx = -1; 632 info->status.rates[i].count = 0; 633 break; 634 } 635 636 count += info->status.rates[i].count; 637 } 638 rates_idx = i - 1; 639 640 if (count < 0) 641 count = 0; 642 643 *retry_count = count; 644 return rates_idx; 645 } 646 647 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb, 648 struct ieee80211_supported_band *sband, 649 int retry_count, int shift, bool send_to_cooked) 650 { 651 struct sk_buff *skb2; 652 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 653 struct ieee80211_sub_if_data *sdata; 654 struct net_device *prev_dev = NULL; 655 int rtap_len; 656 657 /* send frame to monitor interfaces now */ 658 rtap_len = ieee80211_tx_radiotap_len(info); 659 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 660 pr_err("ieee80211_tx_status: headroom too small\n"); 661 dev_kfree_skb(skb); 662 return; 663 } 664 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 665 rtap_len, shift); 666 667 /* XXX: is this sufficient for BPF? */ 668 skb_reset_mac_header(skb); 669 skb->ip_summed = CHECKSUM_UNNECESSARY; 670 skb->pkt_type = PACKET_OTHERHOST; 671 skb->protocol = htons(ETH_P_802_2); 672 memset(skb->cb, 0, sizeof(skb->cb)); 673 674 rcu_read_lock(); 675 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 676 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 677 if (!ieee80211_sdata_running(sdata)) 678 continue; 679 680 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) && 681 !send_to_cooked) 682 continue; 683 684 if (prev_dev) { 685 skb2 = skb_clone(skb, GFP_ATOMIC); 686 if (skb2) { 687 skb2->dev = prev_dev; 688 netif_rx(skb2); 689 } 690 } 691 692 prev_dev = sdata->dev; 693 } 694 } 695 if (prev_dev) { 696 skb->dev = prev_dev; 697 netif_rx(skb); 698 skb = NULL; 699 } 700 rcu_read_unlock(); 701 dev_kfree_skb(skb); 702 } 703 704 static void __ieee80211_tx_status(struct ieee80211_hw *hw, 705 struct ieee80211_tx_status *status) 706 { 707 struct sk_buff *skb = status->skb; 708 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 709 struct ieee80211_local *local = hw_to_local(hw); 710 struct ieee80211_tx_info *info = status->info; 711 struct sta_info *sta; 712 __le16 fc; 713 struct ieee80211_supported_band *sband; 714 int retry_count; 715 int rates_idx; 716 bool send_to_cooked; 717 bool acked; 718 struct ieee80211_bar *bar; 719 int shift = 0; 720 int tid = IEEE80211_NUM_TIDS; 721 722 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 723 724 sband = local->hw.wiphy->bands[info->band]; 725 fc = hdr->frame_control; 726 727 if (status->sta) { 728 sta = container_of(status->sta, struct sta_info, sta); 729 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 730 731 if (info->flags & IEEE80211_TX_STATUS_EOSP) 732 clear_sta_flag(sta, WLAN_STA_SP); 733 734 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 735 736 /* mesh Peer Service Period support */ 737 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 738 ieee80211_is_data_qos(fc)) 739 ieee80211_mpsp_trigger_process( 740 ieee80211_get_qos_ctl(hdr), sta, true, acked); 741 742 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 743 /* 744 * The STA is in power save mode, so assume 745 * that this TX packet failed because of that. 746 */ 747 ieee80211_handle_filtered_frame(local, sta, skb); 748 return; 749 } 750 751 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) && 752 (ieee80211_is_data(hdr->frame_control)) && 753 (rates_idx != -1)) 754 sta->tx_stats.last_rate = 755 info->status.rates[rates_idx]; 756 757 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 758 (ieee80211_is_data_qos(fc))) { 759 u16 ssn; 760 u8 *qc; 761 762 qc = ieee80211_get_qos_ctl(hdr); 763 tid = qc[0] & 0xf; 764 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 765 & IEEE80211_SCTL_SEQ); 766 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 767 tid, ssn); 768 } else if (ieee80211_is_data_qos(fc)) { 769 u8 *qc = ieee80211_get_qos_ctl(hdr); 770 771 tid = qc[0] & 0xf; 772 } 773 774 if (!acked && ieee80211_is_back_req(fc)) { 775 u16 control; 776 777 /* 778 * BAR failed, store the last SSN and retry sending 779 * the BAR when the next unicast transmission on the 780 * same TID succeeds. 781 */ 782 bar = (struct ieee80211_bar *) skb->data; 783 control = le16_to_cpu(bar->control); 784 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 785 u16 ssn = le16_to_cpu(bar->start_seq_num); 786 787 tid = (control & 788 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 789 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 790 791 ieee80211_set_bar_pending(sta, tid, ssn); 792 } 793 } 794 795 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 796 ieee80211_handle_filtered_frame(local, sta, skb); 797 return; 798 } else { 799 if (!acked) 800 sta->status_stats.retry_failed++; 801 sta->status_stats.retry_count += retry_count; 802 803 if (ieee80211_is_data_present(fc)) { 804 if (!acked) 805 sta->status_stats.msdu_failed[tid]++; 806 807 sta->status_stats.msdu_retries[tid] += 808 retry_count; 809 } 810 } 811 812 rate_control_tx_status(local, sband, status); 813 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 814 ieee80211s_update_metric(local, sta, skb); 815 816 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 817 ieee80211_frame_acked(sta, skb); 818 819 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 820 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 821 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, 822 acked, info->status.tx_time); 823 824 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 825 if (info->flags & IEEE80211_TX_STAT_ACK) { 826 if (sta->status_stats.lost_packets) 827 sta->status_stats.lost_packets = 0; 828 829 /* Track when last TDLS packet was ACKed */ 830 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 831 sta->status_stats.last_tdls_pkt_time = 832 jiffies; 833 } else { 834 ieee80211_lost_packet(sta, info); 835 } 836 } 837 } 838 839 /* SNMP counters 840 * Fragments are passed to low-level drivers as separate skbs, so these 841 * are actually fragments, not frames. Update frame counters only for 842 * the first fragment of the frame. */ 843 if ((info->flags & IEEE80211_TX_STAT_ACK) || 844 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) { 845 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 846 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 847 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))) 848 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 849 if (retry_count > 0) 850 I802_DEBUG_INC(local->dot11RetryCount); 851 if (retry_count > 1) 852 I802_DEBUG_INC(local->dot11MultipleRetryCount); 853 } 854 855 /* This counter shall be incremented for an acknowledged MPDU 856 * with an individual address in the address 1 field or an MPDU 857 * with a multicast address in the address 1 field of type Data 858 * or Management. */ 859 if (!is_multicast_ether_addr(hdr->addr1) || 860 ieee80211_is_data(fc) || 861 ieee80211_is_mgmt(fc)) 862 I802_DEBUG_INC(local->dot11TransmittedFragmentCount); 863 } else { 864 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 865 I802_DEBUG_INC(local->dot11FailedCount); 866 } 867 868 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 869 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 870 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 871 local->ps_sdata && !(local->scanning)) { 872 if (info->flags & IEEE80211_TX_STAT_ACK) { 873 local->ps_sdata->u.mgd.flags |= 874 IEEE80211_STA_NULLFUNC_ACKED; 875 } else 876 mod_timer(&local->dynamic_ps_timer, jiffies + 877 msecs_to_jiffies(10)); 878 } 879 880 ieee80211_report_used_skb(local, skb, false); 881 882 /* this was a transmitted frame, but now we want to reuse it */ 883 skb_orphan(skb); 884 885 /* Need to make a copy before skb->cb gets cleared */ 886 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 887 !(ieee80211_is_data(fc)); 888 889 /* 890 * This is a bit racy but we can avoid a lot of work 891 * with this test... 892 */ 893 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 894 dev_kfree_skb(skb); 895 return; 896 } 897 898 /* send to monitor interfaces */ 899 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked); 900 } 901 902 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 903 { 904 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 905 struct ieee80211_local *local = hw_to_local(hw); 906 struct ieee80211_tx_status status = { 907 .skb = skb, 908 .info = IEEE80211_SKB_CB(skb), 909 }; 910 struct rhlist_head *tmp; 911 struct sta_info *sta; 912 913 rcu_read_lock(); 914 915 for_each_sta_info(local, hdr->addr1, sta, tmp) { 916 /* skip wrong virtual interface */ 917 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 918 continue; 919 920 status.sta = &sta->sta; 921 break; 922 } 923 924 __ieee80211_tx_status(hw, &status); 925 rcu_read_unlock(); 926 } 927 EXPORT_SYMBOL(ieee80211_tx_status); 928 929 void ieee80211_tx_status_ext(struct ieee80211_hw *hw, 930 struct ieee80211_tx_status *status) 931 { 932 struct ieee80211_local *local = hw_to_local(hw); 933 struct ieee80211_tx_info *info = status->info; 934 struct ieee80211_sta *pubsta = status->sta; 935 struct ieee80211_supported_band *sband; 936 int retry_count; 937 bool acked, noack_success; 938 939 if (status->skb) 940 return __ieee80211_tx_status(hw, status); 941 942 if (!status->sta) 943 return; 944 945 ieee80211_tx_get_rates(hw, info, &retry_count); 946 947 sband = hw->wiphy->bands[info->band]; 948 949 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 950 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED); 951 952 if (pubsta) { 953 struct sta_info *sta; 954 955 sta = container_of(pubsta, struct sta_info, sta); 956 957 if (!acked) 958 sta->status_stats.retry_failed++; 959 sta->status_stats.retry_count += retry_count; 960 961 if (acked) { 962 sta->status_stats.last_ack = jiffies; 963 964 if (sta->status_stats.lost_packets) 965 sta->status_stats.lost_packets = 0; 966 967 /* Track when last TDLS packet was ACKed */ 968 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 969 sta->status_stats.last_tdls_pkt_time = jiffies; 970 } else { 971 ieee80211_lost_packet(sta, info); 972 } 973 974 rate_control_tx_status(local, sband, status); 975 } 976 977 if (acked || noack_success) { 978 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 979 if (!pubsta) 980 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 981 if (retry_count > 0) 982 I802_DEBUG_INC(local->dot11RetryCount); 983 if (retry_count > 1) 984 I802_DEBUG_INC(local->dot11MultipleRetryCount); 985 } else { 986 I802_DEBUG_INC(local->dot11FailedCount); 987 } 988 } 989 EXPORT_SYMBOL(ieee80211_tx_status_ext); 990 991 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 992 { 993 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 994 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 995 num_packets, GFP_ATOMIC); 996 } 997 EXPORT_SYMBOL(ieee80211_report_low_ack); 998 999 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 1000 { 1001 struct ieee80211_local *local = hw_to_local(hw); 1002 1003 ieee80211_report_used_skb(local, skb, true); 1004 dev_kfree_skb_any(skb); 1005 } 1006 EXPORT_SYMBOL(ieee80211_free_txskb); 1007 1008 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 1009 struct sk_buff_head *skbs) 1010 { 1011 struct sk_buff *skb; 1012 1013 while ((skb = __skb_dequeue(skbs))) 1014 ieee80211_free_txskb(hw, skb); 1015 } 1016