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