1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/export.h> 14 #include <linux/etherdevice.h> 15 #include <net/mac80211.h> 16 #include <asm/unaligned.h> 17 #include "ieee80211_i.h" 18 #include "rate.h" 19 #include "mesh.h" 20 #include "led.h" 21 #include "wme.h" 22 23 24 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 25 struct sk_buff *skb) 26 { 27 struct ieee80211_local *local = hw_to_local(hw); 28 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 29 int tmp; 30 31 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 32 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 33 &local->skb_queue : &local->skb_queue_unreliable, skb); 34 tmp = skb_queue_len(&local->skb_queue) + 35 skb_queue_len(&local->skb_queue_unreliable); 36 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 37 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 38 ieee80211_free_txskb(hw, skb); 39 tmp--; 40 I802_DEBUG_INC(local->tx_status_drop); 41 } 42 tasklet_schedule(&local->tasklet); 43 } 44 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 45 46 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 47 struct sta_info *sta, 48 struct sk_buff *skb) 49 { 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 51 struct ieee80211_hdr *hdr = (void *)skb->data; 52 int ac; 53 54 /* 55 * This skb 'survived' a round-trip through the driver, and 56 * hopefully the driver didn't mangle it too badly. However, 57 * we can definitely not rely on the control information 58 * being correct. Clear it so we don't get junk there, and 59 * indicate that it needs new processing, but must not be 60 * modified/encrypted again. 61 */ 62 memset(&info->control, 0, sizeof(info->control)); 63 64 info->control.jiffies = jiffies; 65 info->control.vif = &sta->sdata->vif; 66 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 67 IEEE80211_TX_INTFL_RETRANSMISSION; 68 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 69 70 sta->tx_filtered_count++; 71 72 /* 73 * Clear more-data bit on filtered frames, it might be set 74 * but later frames might time out so it might have to be 75 * clear again ... It's all rather unlikely (this frame 76 * should time out first, right?) but let's not confuse 77 * peers unnecessarily. 78 */ 79 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 80 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 81 82 if (ieee80211_is_data_qos(hdr->frame_control)) { 83 u8 *p = ieee80211_get_qos_ctl(hdr); 84 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 85 86 /* 87 * Clear EOSP if set, this could happen e.g. 88 * if an absence period (us being a P2P GO) 89 * shortens the SP. 90 */ 91 if (*p & IEEE80211_QOS_CTL_EOSP) 92 *p &= ~IEEE80211_QOS_CTL_EOSP; 93 ac = ieee802_1d_to_ac[tid & 7]; 94 } else { 95 ac = IEEE80211_AC_BE; 96 } 97 98 /* 99 * Clear the TX filter mask for this STA when sending the next 100 * packet. If the STA went to power save mode, this will happen 101 * when it wakes up for the next time. 102 */ 103 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 104 105 /* 106 * This code races in the following way: 107 * 108 * (1) STA sends frame indicating it will go to sleep and does so 109 * (2) hardware/firmware adds STA to filter list, passes frame up 110 * (3) hardware/firmware processes TX fifo and suppresses a frame 111 * (4) we get TX status before having processed the frame and 112 * knowing that the STA has gone to sleep. 113 * 114 * This is actually quite unlikely even when both those events are 115 * processed from interrupts coming in quickly after one another or 116 * even at the same time because we queue both TX status events and 117 * RX frames to be processed by a tasklet and process them in the 118 * same order that they were received or TX status last. Hence, there 119 * is no race as long as the frame RX is processed before the next TX 120 * status, which drivers can ensure, see below. 121 * 122 * Note that this can only happen if the hardware or firmware can 123 * actually add STAs to the filter list, if this is done by the 124 * driver in response to set_tim() (which will only reduce the race 125 * this whole filtering tries to solve, not completely solve it) 126 * this situation cannot happen. 127 * 128 * To completely solve this race drivers need to make sure that they 129 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 130 * functions and 131 * (b) always process RX events before TX status events if ordering 132 * can be unknown, for example with different interrupt status 133 * bits. 134 * (c) if PS mode transitions are manual (i.e. the flag 135 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 136 * changes before calling TX status events if ordering can be 137 * unknown. 138 */ 139 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 140 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 141 skb_queue_tail(&sta->tx_filtered[ac], skb); 142 sta_info_recalc_tim(sta); 143 144 if (!timer_pending(&local->sta_cleanup)) 145 mod_timer(&local->sta_cleanup, 146 round_jiffies(jiffies + 147 STA_INFO_CLEANUP_INTERVAL)); 148 return; 149 } 150 151 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 152 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 153 /* Software retry the packet once */ 154 info->flags |= IEEE80211_TX_INTFL_RETRIED; 155 ieee80211_add_pending_skb(local, skb); 156 return; 157 } 158 159 ps_dbg_ratelimited(sta->sdata, 160 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 161 skb_queue_len(&sta->tx_filtered[ac]), 162 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 163 ieee80211_free_txskb(&local->hw, skb); 164 } 165 166 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 167 { 168 struct tid_ampdu_tx *tid_tx; 169 170 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 171 if (!tid_tx || !tid_tx->bar_pending) 172 return; 173 174 tid_tx->bar_pending = false; 175 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 176 } 177 178 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 179 { 180 struct ieee80211_mgmt *mgmt = (void *) skb->data; 181 struct ieee80211_local *local = sta->local; 182 struct ieee80211_sub_if_data *sdata = sta->sdata; 183 184 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 185 sta->last_rx = jiffies; 186 187 if (ieee80211_is_data_qos(mgmt->frame_control)) { 188 struct ieee80211_hdr *hdr = (void *) skb->data; 189 u8 *qc = ieee80211_get_qos_ctl(hdr); 190 u16 tid = qc[0] & 0xf; 191 192 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 193 } 194 195 if (ieee80211_is_action(mgmt->frame_control) && 196 mgmt->u.action.category == WLAN_CATEGORY_HT && 197 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 198 ieee80211_sdata_running(sdata)) { 199 enum ieee80211_smps_mode smps_mode; 200 201 switch (mgmt->u.action.u.ht_smps.smps_control) { 202 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 203 smps_mode = IEEE80211_SMPS_DYNAMIC; 204 break; 205 case WLAN_HT_SMPS_CONTROL_STATIC: 206 smps_mode = IEEE80211_SMPS_STATIC; 207 break; 208 case WLAN_HT_SMPS_CONTROL_DISABLED: 209 default: /* shouldn't happen since we don't send that */ 210 smps_mode = IEEE80211_SMPS_OFF; 211 break; 212 } 213 214 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 215 /* 216 * This update looks racy, but isn't -- if we come 217 * here we've definitely got a station that we're 218 * talking to, and on a managed interface that can 219 * only be the AP. And the only other place updating 220 * this variable in managed mode is before association. 221 */ 222 sdata->smps_mode = smps_mode; 223 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 224 } else if (sdata->vif.type == NL80211_IFTYPE_AP || 225 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 226 sta->known_smps_mode = smps_mode; 227 } 228 } 229 } 230 231 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 232 { 233 struct tid_ampdu_tx *tid_tx; 234 235 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 236 if (!tid_tx) 237 return; 238 239 tid_tx->failed_bar_ssn = ssn; 240 tid_tx->bar_pending = true; 241 } 242 243 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 244 { 245 int len = sizeof(struct ieee80211_radiotap_header); 246 247 /* IEEE80211_RADIOTAP_RATE rate */ 248 if (info->status.rates[0].idx >= 0 && 249 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 250 IEEE80211_TX_RC_VHT_MCS))) 251 len += 2; 252 253 /* IEEE80211_RADIOTAP_TX_FLAGS */ 254 len += 2; 255 256 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 257 len += 1; 258 259 /* IEEE80211_RADIOTAP_MCS 260 * IEEE80211_RADIOTAP_VHT */ 261 if (info->status.rates[0].idx >= 0) { 262 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 263 len += 3; 264 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 265 len = ALIGN(len, 2) + 12; 266 } 267 268 return len; 269 } 270 271 static void 272 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 273 struct ieee80211_supported_band *sband, 274 struct sk_buff *skb, int retry_count, 275 int rtap_len, int shift) 276 { 277 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 278 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 279 struct ieee80211_radiotap_header *rthdr; 280 unsigned char *pos; 281 u16 txflags; 282 283 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 284 285 memset(rthdr, 0, rtap_len); 286 rthdr->it_len = cpu_to_le16(rtap_len); 287 rthdr->it_present = 288 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 289 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 290 pos = (unsigned char *)(rthdr + 1); 291 292 /* 293 * XXX: Once radiotap gets the bitmap reset thing the vendor 294 * extensions proposal contains, we can actually report 295 * the whole set of tries we did. 296 */ 297 298 /* IEEE80211_RADIOTAP_RATE */ 299 if (info->status.rates[0].idx >= 0 && 300 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 301 IEEE80211_TX_RC_VHT_MCS))) { 302 u16 rate; 303 304 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 305 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 306 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 307 /* padding for tx flags */ 308 pos += 2; 309 } 310 311 /* IEEE80211_RADIOTAP_TX_FLAGS */ 312 txflags = 0; 313 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 314 !is_multicast_ether_addr(hdr->addr1)) 315 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 316 317 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) 318 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 319 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 320 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 321 322 put_unaligned_le16(txflags, pos); 323 pos += 2; 324 325 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 326 /* for now report the total retry_count */ 327 *pos = retry_count; 328 pos++; 329 330 if (info->status.rates[0].idx < 0) 331 return; 332 333 /* IEEE80211_RADIOTAP_MCS 334 * IEEE80211_RADIOTAP_VHT */ 335 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 336 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 337 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 338 IEEE80211_RADIOTAP_MCS_HAVE_GI | 339 IEEE80211_RADIOTAP_MCS_HAVE_BW; 340 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 341 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 342 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 343 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 344 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 345 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 346 pos[2] = info->status.rates[0].idx; 347 pos += 3; 348 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { 349 u16 known = local->hw.radiotap_vht_details & 350 (IEEE80211_RADIOTAP_VHT_KNOWN_GI | 351 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); 352 353 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 354 355 /* required alignment from rthdr */ 356 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); 357 358 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ 359 put_unaligned_le16(known, pos); 360 pos += 2; 361 362 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ 363 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 364 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 365 pos++; 366 367 /* u8 bandwidth */ 368 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 369 *pos = 1; 370 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 371 *pos = 4; 372 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 373 *pos = 11; 374 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ 375 *pos = 0; 376 pos++; 377 378 /* u8 mcs_nss[4] */ 379 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | 380 ieee80211_rate_get_vht_nss(&info->status.rates[0]); 381 pos += 4; 382 383 /* u8 coding */ 384 pos++; 385 /* u8 group_id */ 386 pos++; 387 /* u16 partial_aid */ 388 pos += 2; 389 } 390 } 391 392 /* 393 * Handles the tx for TDLS teardown frames. 394 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP 395 */ 396 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local, 397 struct ieee80211_sub_if_data *sdata, 398 struct sk_buff *skb, u32 flags) 399 { 400 struct sk_buff *teardown_skb; 401 struct sk_buff *orig_teardown_skb; 402 bool is_teardown = false; 403 404 /* Get the teardown data we need and free the lock */ 405 spin_lock(&sdata->u.mgd.teardown_lock); 406 teardown_skb = sdata->u.mgd.teardown_skb; 407 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb; 408 if ((skb == orig_teardown_skb) && teardown_skb) { 409 sdata->u.mgd.teardown_skb = NULL; 410 sdata->u.mgd.orig_teardown_skb = NULL; 411 is_teardown = true; 412 } 413 spin_unlock(&sdata->u.mgd.teardown_lock); 414 415 if (is_teardown) { 416 /* This mechanism relies on being able to get ACKs */ 417 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)); 418 419 /* Check if peer has ACKed */ 420 if (flags & IEEE80211_TX_STAT_ACK) { 421 dev_kfree_skb_any(teardown_skb); 422 } else { 423 tdls_dbg(sdata, 424 "TDLS Resending teardown through AP\n"); 425 426 ieee80211_subif_start_xmit(teardown_skb, skb->dev); 427 } 428 } 429 } 430 431 static struct ieee80211_sub_if_data * 432 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb) 433 { 434 struct ieee80211_sub_if_data *sdata; 435 436 if (skb->dev) { 437 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 438 if (!sdata->dev) 439 continue; 440 441 if (skb->dev == sdata->dev) 442 return sdata; 443 } 444 445 return NULL; 446 } 447 448 return rcu_dereference(local->p2p_sdata); 449 } 450 451 static void ieee80211_report_ack_skb(struct ieee80211_local *local, 452 struct ieee80211_tx_info *info, 453 bool acked, bool dropped) 454 { 455 struct sk_buff *skb; 456 unsigned long flags; 457 458 spin_lock_irqsave(&local->ack_status_lock, flags); 459 skb = idr_find(&local->ack_status_frames, info->ack_frame_id); 460 if (skb) 461 idr_remove(&local->ack_status_frames, info->ack_frame_id); 462 spin_unlock_irqrestore(&local->ack_status_lock, flags); 463 464 if (!skb) 465 return; 466 467 if (dropped) { 468 dev_kfree_skb_any(skb); 469 return; 470 } 471 472 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) { 473 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie; 474 struct ieee80211_sub_if_data *sdata; 475 struct ieee80211_hdr *hdr = (void *)skb->data; 476 477 rcu_read_lock(); 478 sdata = ieee80211_sdata_from_skb(local, skb); 479 if (sdata) { 480 if (ieee80211_is_nullfunc(hdr->frame_control) || 481 ieee80211_is_qos_nullfunc(hdr->frame_control)) 482 cfg80211_probe_status(sdata->dev, hdr->addr1, 483 cookie, acked, 484 GFP_ATOMIC); 485 else 486 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, 487 skb->data, skb->len, 488 acked, GFP_ATOMIC); 489 } 490 rcu_read_unlock(); 491 492 dev_kfree_skb_any(skb); 493 } else { 494 /* consumes skb */ 495 skb_complete_wifi_ack(skb, acked); 496 } 497 } 498 499 static void ieee80211_report_used_skb(struct ieee80211_local *local, 500 struct sk_buff *skb, bool dropped) 501 { 502 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 503 struct ieee80211_hdr *hdr = (void *)skb->data; 504 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 505 506 if (dropped) 507 acked = false; 508 509 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 510 struct ieee80211_sub_if_data *sdata; 511 512 rcu_read_lock(); 513 514 sdata = ieee80211_sdata_from_skb(local, skb); 515 516 if (!sdata) { 517 skb->dev = NULL; 518 } else { 519 unsigned int hdr_size = 520 ieee80211_hdrlen(hdr->frame_control); 521 522 /* Check to see if packet is a TDLS teardown packet */ 523 if (ieee80211_is_data(hdr->frame_control) && 524 (ieee80211_get_tdls_action(skb, hdr_size) == 525 WLAN_TDLS_TEARDOWN)) 526 ieee80211_tdls_td_tx_handle(local, sdata, skb, 527 info->flags); 528 else 529 ieee80211_mgd_conn_tx_status(sdata, 530 hdr->frame_control, 531 acked); 532 } 533 534 rcu_read_unlock(); 535 } else if (info->ack_frame_id) { 536 ieee80211_report_ack_skb(local, info, acked, dropped); 537 } 538 } 539 540 /* 541 * Use a static threshold for now, best value to be determined 542 * by testing ... 543 * Should it depend on: 544 * - on # of retransmissions 545 * - current throughput (higher value for higher tpt)? 546 */ 547 #define STA_LOST_PKT_THRESHOLD 50 548 #define STA_LOST_TDLS_PKT_THRESHOLD 10 549 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */ 550 551 static void ieee80211_lost_packet(struct sta_info *sta, 552 struct ieee80211_tx_info *info) 553 { 554 /* This packet was aggregated but doesn't carry status info */ 555 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 556 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 557 return; 558 559 sta->lost_packets++; 560 if (!sta->sta.tdls && sta->lost_packets < STA_LOST_PKT_THRESHOLD) 561 return; 562 563 /* 564 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD 565 * of the last packets were lost, and that no ACK was received in the 566 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss 567 * mechanism. 568 */ 569 if (sta->sta.tdls && 570 (sta->lost_packets < STA_LOST_TDLS_PKT_THRESHOLD || 571 time_before(jiffies, 572 sta->last_tdls_pkt_time + STA_LOST_TDLS_PKT_TIME))) 573 return; 574 575 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 576 sta->lost_packets, GFP_ATOMIC); 577 sta->lost_packets = 0; 578 } 579 580 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw, 581 struct ieee80211_tx_info *info, 582 int *retry_count) 583 { 584 int rates_idx = -1; 585 int count = -1; 586 int i; 587 588 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 589 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 590 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 591 /* just the first aggr frame carry status info */ 592 info->status.rates[i].idx = -1; 593 info->status.rates[i].count = 0; 594 break; 595 } else if (info->status.rates[i].idx < 0) { 596 break; 597 } else if (i >= hw->max_report_rates) { 598 /* the HW cannot have attempted that rate */ 599 info->status.rates[i].idx = -1; 600 info->status.rates[i].count = 0; 601 break; 602 } 603 604 count += info->status.rates[i].count; 605 } 606 rates_idx = i - 1; 607 608 if (count < 0) 609 count = 0; 610 611 *retry_count = count; 612 return rates_idx; 613 } 614 615 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw, 616 struct ieee80211_sta *pubsta, 617 struct ieee80211_tx_info *info) 618 { 619 struct ieee80211_local *local = hw_to_local(hw); 620 struct ieee80211_supported_band *sband; 621 int retry_count; 622 int rates_idx; 623 bool acked, noack_success; 624 625 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 626 627 sband = hw->wiphy->bands[info->band]; 628 629 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 630 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED); 631 632 if (pubsta) { 633 struct sta_info *sta; 634 635 sta = container_of(pubsta, struct sta_info, sta); 636 637 if (!acked) 638 sta->tx_retry_failed++; 639 sta->tx_retry_count += retry_count; 640 641 if (acked) { 642 sta->last_rx = jiffies; 643 644 if (sta->lost_packets) 645 sta->lost_packets = 0; 646 647 /* Track when last TDLS packet was ACKed */ 648 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 649 sta->last_tdls_pkt_time = jiffies; 650 } else { 651 ieee80211_lost_packet(sta, info); 652 } 653 654 rate_control_tx_status_noskb(local, sband, sta, info); 655 } 656 657 if (acked || noack_success) { 658 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 659 if (!pubsta) 660 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 661 if (retry_count > 0) 662 I802_DEBUG_INC(local->dot11RetryCount); 663 if (retry_count > 1) 664 I802_DEBUG_INC(local->dot11MultipleRetryCount); 665 } else { 666 I802_DEBUG_INC(local->dot11FailedCount); 667 } 668 } 669 EXPORT_SYMBOL(ieee80211_tx_status_noskb); 670 671 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 672 { 673 struct sk_buff *skb2; 674 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 675 struct ieee80211_local *local = hw_to_local(hw); 676 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 677 __le16 fc; 678 struct ieee80211_supported_band *sband; 679 struct ieee80211_sub_if_data *sdata; 680 struct net_device *prev_dev = NULL; 681 struct sta_info *sta; 682 struct rhash_head *tmp; 683 int retry_count; 684 int rates_idx; 685 bool send_to_cooked; 686 bool acked; 687 struct ieee80211_bar *bar; 688 int rtap_len; 689 int shift = 0; 690 int tid = IEEE80211_NUM_TIDS; 691 const struct bucket_table *tbl; 692 693 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 694 695 rcu_read_lock(); 696 697 sband = local->hw.wiphy->bands[info->band]; 698 fc = hdr->frame_control; 699 700 tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash); 701 702 for_each_sta_info(local, tbl, hdr->addr1, sta, tmp) { 703 /* skip wrong virtual interface */ 704 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 705 continue; 706 707 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 708 709 if (info->flags & IEEE80211_TX_STATUS_EOSP) 710 clear_sta_flag(sta, WLAN_STA_SP); 711 712 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 713 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 714 /* 715 * The STA is in power save mode, so assume 716 * that this TX packet failed because of that. 717 */ 718 ieee80211_handle_filtered_frame(local, sta, skb); 719 rcu_read_unlock(); 720 return; 721 } 722 723 /* mesh Peer Service Period support */ 724 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 725 ieee80211_is_data_qos(fc)) 726 ieee80211_mpsp_trigger_process( 727 ieee80211_get_qos_ctl(hdr), 728 sta, true, acked); 729 730 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) && 731 (ieee80211_is_data(hdr->frame_control)) && 732 (rates_idx != -1)) 733 sta->last_tx_rate = info->status.rates[rates_idx]; 734 735 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 736 (ieee80211_is_data_qos(fc))) { 737 u16 ssn; 738 u8 *qc; 739 740 qc = ieee80211_get_qos_ctl(hdr); 741 tid = qc[0] & 0xf; 742 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 743 & IEEE80211_SCTL_SEQ); 744 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 745 tid, ssn); 746 } else if (ieee80211_is_data_qos(fc)) { 747 u8 *qc = ieee80211_get_qos_ctl(hdr); 748 749 tid = qc[0] & 0xf; 750 } 751 752 if (!acked && ieee80211_is_back_req(fc)) { 753 u16 control; 754 755 /* 756 * BAR failed, store the last SSN and retry sending 757 * the BAR when the next unicast transmission on the 758 * same TID succeeds. 759 */ 760 bar = (struct ieee80211_bar *) skb->data; 761 control = le16_to_cpu(bar->control); 762 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 763 u16 ssn = le16_to_cpu(bar->start_seq_num); 764 765 tid = (control & 766 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 767 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 768 769 ieee80211_set_bar_pending(sta, tid, ssn); 770 } 771 } 772 773 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 774 ieee80211_handle_filtered_frame(local, sta, skb); 775 rcu_read_unlock(); 776 return; 777 } else { 778 if (!acked) 779 sta->tx_retry_failed++; 780 sta->tx_retry_count += retry_count; 781 782 if (ieee80211_is_data_present(fc)) { 783 if (!acked) 784 sta->tx_msdu_failed[tid]++; 785 sta->tx_msdu_retries[tid] += retry_count; 786 } 787 } 788 789 rate_control_tx_status(local, sband, sta, skb); 790 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 791 ieee80211s_update_metric(local, sta, skb); 792 793 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 794 ieee80211_frame_acked(sta, skb); 795 796 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 797 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 798 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, 799 acked, info->status.tx_time); 800 801 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 802 if (info->flags & IEEE80211_TX_STAT_ACK) { 803 if (sta->lost_packets) 804 sta->lost_packets = 0; 805 806 /* Track when last TDLS packet was ACKed */ 807 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 808 sta->last_tdls_pkt_time = jiffies; 809 } else { 810 ieee80211_lost_packet(sta, info); 811 } 812 } 813 814 if (acked) 815 sta->last_ack_signal = info->status.ack_signal; 816 } 817 818 rcu_read_unlock(); 819 820 ieee80211_led_tx(local); 821 822 /* SNMP counters 823 * Fragments are passed to low-level drivers as separate skbs, so these 824 * are actually fragments, not frames. Update frame counters only for 825 * the first fragment of the frame. */ 826 if ((info->flags & IEEE80211_TX_STAT_ACK) || 827 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) { 828 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 829 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 830 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))) 831 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 832 if (retry_count > 0) 833 I802_DEBUG_INC(local->dot11RetryCount); 834 if (retry_count > 1) 835 I802_DEBUG_INC(local->dot11MultipleRetryCount); 836 } 837 838 /* This counter shall be incremented for an acknowledged MPDU 839 * with an individual address in the address 1 field or an MPDU 840 * with a multicast address in the address 1 field of type Data 841 * or Management. */ 842 if (!is_multicast_ether_addr(hdr->addr1) || 843 ieee80211_is_data(fc) || 844 ieee80211_is_mgmt(fc)) 845 I802_DEBUG_INC(local->dot11TransmittedFragmentCount); 846 } else { 847 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 848 I802_DEBUG_INC(local->dot11FailedCount); 849 } 850 851 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 852 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 853 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 854 local->ps_sdata && !(local->scanning)) { 855 if (info->flags & IEEE80211_TX_STAT_ACK) { 856 local->ps_sdata->u.mgd.flags |= 857 IEEE80211_STA_NULLFUNC_ACKED; 858 } else 859 mod_timer(&local->dynamic_ps_timer, jiffies + 860 msecs_to_jiffies(10)); 861 } 862 863 ieee80211_report_used_skb(local, skb, false); 864 865 /* this was a transmitted frame, but now we want to reuse it */ 866 skb_orphan(skb); 867 868 /* Need to make a copy before skb->cb gets cleared */ 869 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 870 !(ieee80211_is_data(fc)); 871 872 /* 873 * This is a bit racy but we can avoid a lot of work 874 * with this test... 875 */ 876 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 877 dev_kfree_skb(skb); 878 return; 879 } 880 881 /* send frame to monitor interfaces now */ 882 rtap_len = ieee80211_tx_radiotap_len(info); 883 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 884 pr_err("ieee80211_tx_status: headroom too small\n"); 885 dev_kfree_skb(skb); 886 return; 887 } 888 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 889 rtap_len, shift); 890 891 /* XXX: is this sufficient for BPF? */ 892 skb_set_mac_header(skb, 0); 893 skb->ip_summed = CHECKSUM_UNNECESSARY; 894 skb->pkt_type = PACKET_OTHERHOST; 895 skb->protocol = htons(ETH_P_802_2); 896 memset(skb->cb, 0, sizeof(skb->cb)); 897 898 rcu_read_lock(); 899 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 900 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 901 if (!ieee80211_sdata_running(sdata)) 902 continue; 903 904 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 905 !send_to_cooked) 906 continue; 907 908 if (prev_dev) { 909 skb2 = skb_clone(skb, GFP_ATOMIC); 910 if (skb2) { 911 skb2->dev = prev_dev; 912 netif_rx(skb2); 913 } 914 } 915 916 prev_dev = sdata->dev; 917 } 918 } 919 if (prev_dev) { 920 skb->dev = prev_dev; 921 netif_rx(skb); 922 skb = NULL; 923 } 924 rcu_read_unlock(); 925 dev_kfree_skb(skb); 926 } 927 EXPORT_SYMBOL(ieee80211_tx_status); 928 929 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 930 { 931 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 932 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 933 num_packets, GFP_ATOMIC); 934 } 935 EXPORT_SYMBOL(ieee80211_report_low_ack); 936 937 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 938 { 939 struct ieee80211_local *local = hw_to_local(hw); 940 941 ieee80211_report_used_skb(local, skb, true); 942 dev_kfree_skb_any(skb); 943 } 944 EXPORT_SYMBOL(ieee80211_free_txskb); 945 946 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 947 struct sk_buff_head *skbs) 948 { 949 struct sk_buff *skb; 950 951 while ((skb = __skb_dequeue(skbs))) 952 ieee80211_free_txskb(hw, skb); 953 } 954