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