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_free_txskb(&local->hw, skb); 56 return; 57 } 58 59 /* 60 * This skb 'survived' a round-trip through the driver, and 61 * hopefully the driver didn't mangle it too badly. However, 62 * we can definitely not rely on the control information 63 * being correct. Clear it so we don't get junk there, and 64 * indicate that it needs new processing, but must not be 65 * modified/encrypted again. 66 */ 67 memset(&info->control, 0, sizeof(info->control)); 68 69 info->control.jiffies = jiffies; 70 info->control.vif = &sta->sdata->vif; 71 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 72 IEEE80211_TX_INTFL_RETRANSMISSION; 73 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 74 75 sta->status_stats.filtered++; 76 77 /* 78 * Clear more-data bit on filtered frames, it might be set 79 * but later frames might time out so it might have to be 80 * clear again ... It's all rather unlikely (this frame 81 * should time out first, right?) but let's not confuse 82 * peers unnecessarily. 83 */ 84 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 85 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 86 87 if (ieee80211_is_data_qos(hdr->frame_control)) { 88 u8 *p = ieee80211_get_qos_ctl(hdr); 89 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 90 91 /* 92 * Clear EOSP if set, this could happen e.g. 93 * if an absence period (us being a P2P GO) 94 * shortens the SP. 95 */ 96 if (*p & IEEE80211_QOS_CTL_EOSP) 97 *p &= ~IEEE80211_QOS_CTL_EOSP; 98 ac = ieee802_1d_to_ac[tid & 7]; 99 } else { 100 ac = IEEE80211_AC_BE; 101 } 102 103 /* 104 * Clear the TX filter mask for this STA when sending the next 105 * packet. If the STA went to power save mode, this will happen 106 * when it wakes up for the next time. 107 */ 108 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 109 ieee80211_clear_fast_xmit(sta); 110 111 /* 112 * This code races in the following way: 113 * 114 * (1) STA sends frame indicating it will go to sleep and does so 115 * (2) hardware/firmware adds STA to filter list, passes frame up 116 * (3) hardware/firmware processes TX fifo and suppresses a frame 117 * (4) we get TX status before having processed the frame and 118 * knowing that the STA has gone to sleep. 119 * 120 * This is actually quite unlikely even when both those events are 121 * processed from interrupts coming in quickly after one another or 122 * even at the same time because we queue both TX status events and 123 * RX frames to be processed by a tasklet and process them in the 124 * same order that they were received or TX status last. Hence, there 125 * is no race as long as the frame RX is processed before the next TX 126 * status, which drivers can ensure, see below. 127 * 128 * Note that this can only happen if the hardware or firmware can 129 * actually add STAs to the filter list, if this is done by the 130 * driver in response to set_tim() (which will only reduce the race 131 * this whole filtering tries to solve, not completely solve it) 132 * this situation cannot happen. 133 * 134 * To completely solve this race drivers need to make sure that they 135 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 136 * functions and 137 * (b) always process RX events before TX status events if ordering 138 * can be unknown, for example with different interrupt status 139 * bits. 140 * (c) if PS mode transitions are manual (i.e. the flag 141 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 142 * changes before calling TX status events if ordering can be 143 * unknown. 144 */ 145 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 146 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 147 skb_queue_tail(&sta->tx_filtered[ac], skb); 148 sta_info_recalc_tim(sta); 149 150 if (!timer_pending(&local->sta_cleanup)) 151 mod_timer(&local->sta_cleanup, 152 round_jiffies(jiffies + 153 STA_INFO_CLEANUP_INTERVAL)); 154 return; 155 } 156 157 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 158 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 159 /* Software retry the packet once */ 160 info->flags |= IEEE80211_TX_INTFL_RETRIED; 161 ieee80211_add_pending_skb(local, skb); 162 return; 163 } 164 165 ps_dbg_ratelimited(sta->sdata, 166 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 167 skb_queue_len(&sta->tx_filtered[ac]), 168 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 169 ieee80211_free_txskb(&local->hw, skb); 170 } 171 172 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 173 { 174 struct tid_ampdu_tx *tid_tx; 175 176 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 177 if (!tid_tx || !tid_tx->bar_pending) 178 return; 179 180 tid_tx->bar_pending = false; 181 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 182 } 183 184 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 185 { 186 struct ieee80211_mgmt *mgmt = (void *) skb->data; 187 struct ieee80211_local *local = sta->local; 188 struct ieee80211_sub_if_data *sdata = sta->sdata; 189 190 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 191 sta->status_stats.last_ack = jiffies; 192 193 if (ieee80211_is_data_qos(mgmt->frame_control)) { 194 struct ieee80211_hdr *hdr = (void *) skb->data; 195 u8 *qc = ieee80211_get_qos_ctl(hdr); 196 u16 tid = qc[0] & 0xf; 197 198 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 199 } 200 201 if (ieee80211_is_action(mgmt->frame_control) && 202 mgmt->u.action.category == WLAN_CATEGORY_HT && 203 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 204 ieee80211_sdata_running(sdata)) { 205 enum ieee80211_smps_mode smps_mode; 206 207 switch (mgmt->u.action.u.ht_smps.smps_control) { 208 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 209 smps_mode = IEEE80211_SMPS_DYNAMIC; 210 break; 211 case WLAN_HT_SMPS_CONTROL_STATIC: 212 smps_mode = IEEE80211_SMPS_STATIC; 213 break; 214 case WLAN_HT_SMPS_CONTROL_DISABLED: 215 default: /* shouldn't happen since we don't send that */ 216 smps_mode = IEEE80211_SMPS_OFF; 217 break; 218 } 219 220 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 221 /* 222 * This update looks racy, but isn't -- if we come 223 * here we've definitely got a station that we're 224 * talking to, and on a managed interface that can 225 * only be the AP. And the only other place updating 226 * this variable in managed mode is before association. 227 */ 228 sdata->smps_mode = smps_mode; 229 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 230 } else if (sdata->vif.type == NL80211_IFTYPE_AP || 231 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 232 sta->known_smps_mode = smps_mode; 233 } 234 } 235 } 236 237 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 238 { 239 struct tid_ampdu_tx *tid_tx; 240 241 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 242 if (!tid_tx) 243 return; 244 245 tid_tx->failed_bar_ssn = ssn; 246 tid_tx->bar_pending = true; 247 } 248 249 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 250 { 251 int len = sizeof(struct ieee80211_radiotap_header); 252 253 /* IEEE80211_RADIOTAP_RATE rate */ 254 if (info->status.rates[0].idx >= 0 && 255 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 256 IEEE80211_TX_RC_VHT_MCS))) 257 len += 2; 258 259 /* IEEE80211_RADIOTAP_TX_FLAGS */ 260 len += 2; 261 262 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 263 len += 1; 264 265 /* IEEE80211_RADIOTAP_MCS 266 * IEEE80211_RADIOTAP_VHT */ 267 if (info->status.rates[0].idx >= 0) { 268 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 269 len += 3; 270 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 271 len = ALIGN(len, 2) + 12; 272 } 273 274 return len; 275 } 276 277 static void 278 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 279 struct ieee80211_supported_band *sband, 280 struct sk_buff *skb, int retry_count, 281 int rtap_len, int shift) 282 { 283 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 285 struct ieee80211_radiotap_header *rthdr; 286 unsigned char *pos; 287 u16 txflags; 288 289 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 290 291 memset(rthdr, 0, rtap_len); 292 rthdr->it_len = cpu_to_le16(rtap_len); 293 rthdr->it_present = 294 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 295 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 296 pos = (unsigned char *)(rthdr + 1); 297 298 /* 299 * XXX: Once radiotap gets the bitmap reset thing the vendor 300 * extensions proposal contains, we can actually report 301 * the whole set of tries we did. 302 */ 303 304 /* IEEE80211_RADIOTAP_RATE */ 305 if (info->status.rates[0].idx >= 0 && 306 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 307 IEEE80211_TX_RC_VHT_MCS))) { 308 u16 rate; 309 310 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 311 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 312 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 313 /* padding for tx flags */ 314 pos += 2; 315 } 316 317 /* IEEE80211_RADIOTAP_TX_FLAGS */ 318 txflags = 0; 319 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 320 !is_multicast_ether_addr(hdr->addr1)) 321 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 322 323 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) 324 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 325 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 326 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 327 328 put_unaligned_le16(txflags, pos); 329 pos += 2; 330 331 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 332 /* for now report the total retry_count */ 333 *pos = retry_count; 334 pos++; 335 336 if (info->status.rates[0].idx < 0) 337 return; 338 339 /* IEEE80211_RADIOTAP_MCS 340 * IEEE80211_RADIOTAP_VHT */ 341 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 342 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 343 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 344 IEEE80211_RADIOTAP_MCS_HAVE_GI | 345 IEEE80211_RADIOTAP_MCS_HAVE_BW; 346 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 347 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 348 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 349 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 350 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 351 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 352 pos[2] = info->status.rates[0].idx; 353 pos += 3; 354 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { 355 u16 known = local->hw.radiotap_vht_details & 356 (IEEE80211_RADIOTAP_VHT_KNOWN_GI | 357 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); 358 359 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 360 361 /* required alignment from rthdr */ 362 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); 363 364 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ 365 put_unaligned_le16(known, pos); 366 pos += 2; 367 368 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ 369 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 370 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 371 pos++; 372 373 /* u8 bandwidth */ 374 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 375 *pos = 1; 376 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 377 *pos = 4; 378 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 379 *pos = 11; 380 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ 381 *pos = 0; 382 pos++; 383 384 /* u8 mcs_nss[4] */ 385 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | 386 ieee80211_rate_get_vht_nss(&info->status.rates[0]); 387 pos += 4; 388 389 /* u8 coding */ 390 pos++; 391 /* u8 group_id */ 392 pos++; 393 /* u16 partial_aid */ 394 pos += 2; 395 } 396 } 397 398 /* 399 * Handles the tx for TDLS teardown frames. 400 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP 401 */ 402 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local, 403 struct ieee80211_sub_if_data *sdata, 404 struct sk_buff *skb, u32 flags) 405 { 406 struct sk_buff *teardown_skb; 407 struct sk_buff *orig_teardown_skb; 408 bool is_teardown = false; 409 410 /* Get the teardown data we need and free the lock */ 411 spin_lock(&sdata->u.mgd.teardown_lock); 412 teardown_skb = sdata->u.mgd.teardown_skb; 413 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb; 414 if ((skb == orig_teardown_skb) && teardown_skb) { 415 sdata->u.mgd.teardown_skb = NULL; 416 sdata->u.mgd.orig_teardown_skb = NULL; 417 is_teardown = true; 418 } 419 spin_unlock(&sdata->u.mgd.teardown_lock); 420 421 if (is_teardown) { 422 /* This mechanism relies on being able to get ACKs */ 423 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)); 424 425 /* Check if peer has ACKed */ 426 if (flags & IEEE80211_TX_STAT_ACK) { 427 dev_kfree_skb_any(teardown_skb); 428 } else { 429 tdls_dbg(sdata, 430 "TDLS Resending teardown through AP\n"); 431 432 ieee80211_subif_start_xmit(teardown_skb, skb->dev); 433 } 434 } 435 } 436 437 static struct ieee80211_sub_if_data * 438 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb) 439 { 440 struct ieee80211_sub_if_data *sdata; 441 442 if (skb->dev) { 443 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 444 if (!sdata->dev) 445 continue; 446 447 if (skb->dev == sdata->dev) 448 return sdata; 449 } 450 451 return NULL; 452 } 453 454 return rcu_dereference(local->p2p_sdata); 455 } 456 457 static void ieee80211_report_ack_skb(struct ieee80211_local *local, 458 struct ieee80211_tx_info *info, 459 bool acked, bool dropped) 460 { 461 struct sk_buff *skb; 462 unsigned long flags; 463 464 spin_lock_irqsave(&local->ack_status_lock, flags); 465 skb = idr_find(&local->ack_status_frames, info->ack_frame_id); 466 if (skb) 467 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 } 545 546 /* 547 * Use a static threshold for now, best value to be determined 548 * by testing ... 549 * Should it depend on: 550 * - on # of retransmissions 551 * - current throughput (higher value for higher tpt)? 552 */ 553 #define STA_LOST_PKT_THRESHOLD 50 554 #define STA_LOST_TDLS_PKT_THRESHOLD 10 555 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */ 556 557 static void ieee80211_lost_packet(struct sta_info *sta, 558 struct ieee80211_tx_info *info) 559 { 560 /* If driver relies on its own algorithm for station kickout, skip 561 * mac80211 packet loss mechanism. 562 */ 563 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK)) 564 return; 565 566 /* This packet was aggregated but doesn't carry status info */ 567 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 568 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 569 return; 570 571 sta->status_stats.lost_packets++; 572 if (!sta->sta.tdls && 573 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD) 574 return; 575 576 /* 577 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD 578 * of the last packets were lost, and that no ACK was received in the 579 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss 580 * mechanism. 581 */ 582 if (sta->sta.tdls && 583 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD || 584 time_before(jiffies, 585 sta->status_stats.last_tdls_pkt_time + 586 STA_LOST_TDLS_PKT_TIME))) 587 return; 588 589 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 590 sta->status_stats.lost_packets, GFP_ATOMIC); 591 sta->status_stats.lost_packets = 0; 592 } 593 594 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw, 595 struct ieee80211_tx_info *info, 596 int *retry_count) 597 { 598 int rates_idx = -1; 599 int count = -1; 600 int i; 601 602 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 603 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 604 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 605 /* just the first aggr frame carry status info */ 606 info->status.rates[i].idx = -1; 607 info->status.rates[i].count = 0; 608 break; 609 } else if (info->status.rates[i].idx < 0) { 610 break; 611 } else if (i >= hw->max_report_rates) { 612 /* the HW cannot have attempted that rate */ 613 info->status.rates[i].idx = -1; 614 info->status.rates[i].count = 0; 615 break; 616 } 617 618 count += info->status.rates[i].count; 619 } 620 rates_idx = i - 1; 621 622 if (count < 0) 623 count = 0; 624 625 *retry_count = count; 626 return rates_idx; 627 } 628 629 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw, 630 struct ieee80211_sta *pubsta, 631 struct ieee80211_tx_info *info) 632 { 633 struct ieee80211_local *local = hw_to_local(hw); 634 struct ieee80211_supported_band *sband; 635 int retry_count; 636 int rates_idx; 637 bool acked, noack_success; 638 639 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 640 641 sband = hw->wiphy->bands[info->band]; 642 643 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 644 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED); 645 646 if (pubsta) { 647 struct sta_info *sta; 648 649 sta = container_of(pubsta, struct sta_info, sta); 650 651 if (!acked) 652 sta->status_stats.retry_failed++; 653 sta->status_stats.retry_count += retry_count; 654 655 if (acked) { 656 sta->status_stats.last_ack = jiffies; 657 658 if (sta->status_stats.lost_packets) 659 sta->status_stats.lost_packets = 0; 660 661 /* Track when last TDLS packet was ACKed */ 662 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 663 sta->status_stats.last_tdls_pkt_time = jiffies; 664 } else { 665 ieee80211_lost_packet(sta, info); 666 } 667 668 rate_control_tx_status_noskb(local, sband, sta, info); 669 } 670 671 if (acked || noack_success) { 672 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 673 if (!pubsta) 674 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 675 if (retry_count > 0) 676 I802_DEBUG_INC(local->dot11RetryCount); 677 if (retry_count > 1) 678 I802_DEBUG_INC(local->dot11MultipleRetryCount); 679 } else { 680 I802_DEBUG_INC(local->dot11FailedCount); 681 } 682 } 683 EXPORT_SYMBOL(ieee80211_tx_status_noskb); 684 685 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb, 686 struct ieee80211_supported_band *sband, 687 int retry_count, int shift, bool send_to_cooked) 688 { 689 struct sk_buff *skb2; 690 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 691 struct ieee80211_sub_if_data *sdata; 692 struct net_device *prev_dev = NULL; 693 int rtap_len; 694 695 /* send frame to monitor interfaces now */ 696 rtap_len = ieee80211_tx_radiotap_len(info); 697 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 698 pr_err("ieee80211_tx_status: headroom too small\n"); 699 dev_kfree_skb(skb); 700 return; 701 } 702 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 703 rtap_len, shift); 704 705 /* XXX: is this sufficient for BPF? */ 706 skb_reset_mac_header(skb); 707 skb->ip_summed = CHECKSUM_UNNECESSARY; 708 skb->pkt_type = PACKET_OTHERHOST; 709 skb->protocol = htons(ETH_P_802_2); 710 memset(skb->cb, 0, sizeof(skb->cb)); 711 712 rcu_read_lock(); 713 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 714 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 715 if (!ieee80211_sdata_running(sdata)) 716 continue; 717 718 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) && 719 !send_to_cooked) 720 continue; 721 722 if (prev_dev) { 723 skb2 = skb_clone(skb, GFP_ATOMIC); 724 if (skb2) { 725 skb2->dev = prev_dev; 726 netif_rx(skb2); 727 } 728 } 729 730 prev_dev = sdata->dev; 731 } 732 } 733 if (prev_dev) { 734 skb->dev = prev_dev; 735 netif_rx(skb); 736 skb = NULL; 737 } 738 rcu_read_unlock(); 739 dev_kfree_skb(skb); 740 } 741 742 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 743 { 744 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 745 struct ieee80211_local *local = hw_to_local(hw); 746 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 747 __le16 fc; 748 struct ieee80211_supported_band *sband; 749 struct rhlist_head *tmp; 750 struct sta_info *sta; 751 int retry_count; 752 int rates_idx; 753 bool send_to_cooked; 754 bool acked; 755 struct ieee80211_bar *bar; 756 int shift = 0; 757 int tid = IEEE80211_NUM_TIDS; 758 759 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 760 761 rcu_read_lock(); 762 763 sband = local->hw.wiphy->bands[info->band]; 764 fc = hdr->frame_control; 765 766 for_each_sta_info(local, hdr->addr1, sta, tmp) { 767 /* skip wrong virtual interface */ 768 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 769 continue; 770 771 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 772 773 if (info->flags & IEEE80211_TX_STATUS_EOSP) 774 clear_sta_flag(sta, WLAN_STA_SP); 775 776 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 777 778 /* mesh Peer Service Period support */ 779 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 780 ieee80211_is_data_qos(fc)) 781 ieee80211_mpsp_trigger_process( 782 ieee80211_get_qos_ctl(hdr), sta, true, acked); 783 784 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 785 /* 786 * The STA is in power save mode, so assume 787 * that this TX packet failed because of that. 788 */ 789 ieee80211_handle_filtered_frame(local, sta, skb); 790 rcu_read_unlock(); 791 return; 792 } 793 794 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) && 795 (ieee80211_is_data(hdr->frame_control)) && 796 (rates_idx != -1)) 797 sta->tx_stats.last_rate = 798 info->status.rates[rates_idx]; 799 800 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 801 (ieee80211_is_data_qos(fc))) { 802 u16 ssn; 803 u8 *qc; 804 805 qc = ieee80211_get_qos_ctl(hdr); 806 tid = qc[0] & 0xf; 807 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 808 & IEEE80211_SCTL_SEQ); 809 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 810 tid, ssn); 811 } else if (ieee80211_is_data_qos(fc)) { 812 u8 *qc = ieee80211_get_qos_ctl(hdr); 813 814 tid = qc[0] & 0xf; 815 } 816 817 if (!acked && ieee80211_is_back_req(fc)) { 818 u16 control; 819 820 /* 821 * BAR failed, store the last SSN and retry sending 822 * the BAR when the next unicast transmission on the 823 * same TID succeeds. 824 */ 825 bar = (struct ieee80211_bar *) skb->data; 826 control = le16_to_cpu(bar->control); 827 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 828 u16 ssn = le16_to_cpu(bar->start_seq_num); 829 830 tid = (control & 831 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 832 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 833 834 ieee80211_set_bar_pending(sta, tid, ssn); 835 } 836 } 837 838 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 839 ieee80211_handle_filtered_frame(local, sta, skb); 840 rcu_read_unlock(); 841 return; 842 } else { 843 if (!acked) 844 sta->status_stats.retry_failed++; 845 sta->status_stats.retry_count += retry_count; 846 847 if (ieee80211_is_data_present(fc)) { 848 if (!acked) 849 sta->status_stats.msdu_failed[tid]++; 850 851 sta->status_stats.msdu_retries[tid] += 852 retry_count; 853 } 854 } 855 856 rate_control_tx_status(local, sband, sta, skb); 857 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 858 ieee80211s_update_metric(local, sta, skb); 859 860 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 861 ieee80211_frame_acked(sta, skb); 862 863 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 864 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 865 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, 866 acked, info->status.tx_time); 867 868 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 869 if (info->flags & IEEE80211_TX_STAT_ACK) { 870 if (sta->status_stats.lost_packets) 871 sta->status_stats.lost_packets = 0; 872 873 /* Track when last TDLS packet was ACKed */ 874 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 875 sta->status_stats.last_tdls_pkt_time = 876 jiffies; 877 } else { 878 ieee80211_lost_packet(sta, info); 879 } 880 } 881 } 882 883 rcu_read_unlock(); 884 885 ieee80211_led_tx(local); 886 887 /* SNMP counters 888 * Fragments are passed to low-level drivers as separate skbs, so these 889 * are actually fragments, not frames. Update frame counters only for 890 * the first fragment of the frame. */ 891 if ((info->flags & IEEE80211_TX_STAT_ACK) || 892 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) { 893 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 894 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 895 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))) 896 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 897 if (retry_count > 0) 898 I802_DEBUG_INC(local->dot11RetryCount); 899 if (retry_count > 1) 900 I802_DEBUG_INC(local->dot11MultipleRetryCount); 901 } 902 903 /* This counter shall be incremented for an acknowledged MPDU 904 * with an individual address in the address 1 field or an MPDU 905 * with a multicast address in the address 1 field of type Data 906 * or Management. */ 907 if (!is_multicast_ether_addr(hdr->addr1) || 908 ieee80211_is_data(fc) || 909 ieee80211_is_mgmt(fc)) 910 I802_DEBUG_INC(local->dot11TransmittedFragmentCount); 911 } else { 912 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 913 I802_DEBUG_INC(local->dot11FailedCount); 914 } 915 916 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 917 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 918 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 919 local->ps_sdata && !(local->scanning)) { 920 if (info->flags & IEEE80211_TX_STAT_ACK) { 921 local->ps_sdata->u.mgd.flags |= 922 IEEE80211_STA_NULLFUNC_ACKED; 923 } else 924 mod_timer(&local->dynamic_ps_timer, jiffies + 925 msecs_to_jiffies(10)); 926 } 927 928 ieee80211_report_used_skb(local, skb, false); 929 930 /* this was a transmitted frame, but now we want to reuse it */ 931 skb_orphan(skb); 932 933 /* Need to make a copy before skb->cb gets cleared */ 934 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 935 !(ieee80211_is_data(fc)); 936 937 /* 938 * This is a bit racy but we can avoid a lot of work 939 * with this test... 940 */ 941 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 942 dev_kfree_skb(skb); 943 return; 944 } 945 946 /* send to monitor interfaces */ 947 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked); 948 } 949 EXPORT_SYMBOL(ieee80211_tx_status); 950 951 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 952 { 953 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 954 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 955 num_packets, GFP_ATOMIC); 956 } 957 EXPORT_SYMBOL(ieee80211_report_low_ack); 958 959 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 960 { 961 struct ieee80211_local *local = hw_to_local(hw); 962 963 ieee80211_report_used_skb(local, skb, true); 964 dev_kfree_skb_any(skb); 965 } 966 EXPORT_SYMBOL(ieee80211_free_txskb); 967 968 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 969 struct sk_buff_head *skbs) 970 { 971 struct sk_buff *skb; 972 973 while ((skb = __skb_dequeue(skbs))) 974 ieee80211_free_txskb(hw, skb); 975 } 976