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