1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 */ 9 10 #include <linux/export.h> 11 #include <linux/etherdevice.h> 12 #include <net/mac80211.h> 13 #include <asm/unaligned.h> 14 #include "ieee80211_i.h" 15 #include "rate.h" 16 #include "mesh.h" 17 #include "led.h" 18 #include "wme.h" 19 20 21 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 22 struct sk_buff *skb) 23 { 24 struct ieee80211_local *local = hw_to_local(hw); 25 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 26 int tmp; 27 28 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 29 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 30 &local->skb_queue : &local->skb_queue_unreliable, skb); 31 tmp = skb_queue_len(&local->skb_queue) + 32 skb_queue_len(&local->skb_queue_unreliable); 33 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 34 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 35 ieee80211_free_txskb(hw, skb); 36 tmp--; 37 I802_DEBUG_INC(local->tx_status_drop); 38 } 39 tasklet_schedule(&local->tasklet); 40 } 41 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 42 43 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 44 struct sta_info *sta, 45 struct sk_buff *skb) 46 { 47 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 48 struct ieee80211_hdr *hdr = (void *)skb->data; 49 int ac; 50 51 if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER | 52 IEEE80211_TX_CTL_AMPDU)) { 53 ieee80211_free_txskb(&local->hw, skb); 54 return; 55 } 56 57 /* 58 * This skb 'survived' a round-trip through the driver, and 59 * hopefully the driver didn't mangle it too badly. However, 60 * we can definitely not rely on the control information 61 * being correct. Clear it so we don't get junk there, and 62 * indicate that it needs new processing, but must not be 63 * modified/encrypted again. 64 */ 65 memset(&info->control, 0, sizeof(info->control)); 66 67 info->control.jiffies = jiffies; 68 info->control.vif = &sta->sdata->vif; 69 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 70 IEEE80211_TX_INTFL_RETRANSMISSION; 71 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 72 73 sta->status_stats.filtered++; 74 75 /* 76 * Clear more-data bit on filtered frames, it might be set 77 * but later frames might time out so it might have to be 78 * clear again ... It's all rather unlikely (this frame 79 * should time out first, right?) but let's not confuse 80 * peers unnecessarily. 81 */ 82 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 83 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 84 85 if (ieee80211_is_data_qos(hdr->frame_control)) { 86 u8 *p = ieee80211_get_qos_ctl(hdr); 87 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 88 89 /* 90 * Clear EOSP if set, this could happen e.g. 91 * if an absence period (us being a P2P GO) 92 * shortens the SP. 93 */ 94 if (*p & IEEE80211_QOS_CTL_EOSP) 95 *p &= ~IEEE80211_QOS_CTL_EOSP; 96 ac = ieee80211_ac_from_tid(tid); 97 } else { 98 ac = IEEE80211_AC_BE; 99 } 100 101 /* 102 * Clear the TX filter mask for this STA when sending the next 103 * packet. If the STA went to power save mode, this will happen 104 * when it wakes up for the next time. 105 */ 106 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 107 ieee80211_clear_fast_xmit(sta); 108 109 /* 110 * This code races in the following way: 111 * 112 * (1) STA sends frame indicating it will go to sleep and does so 113 * (2) hardware/firmware adds STA to filter list, passes frame up 114 * (3) hardware/firmware processes TX fifo and suppresses a frame 115 * (4) we get TX status before having processed the frame and 116 * knowing that the STA has gone to sleep. 117 * 118 * This is actually quite unlikely even when both those events are 119 * processed from interrupts coming in quickly after one another or 120 * even at the same time because we queue both TX status events and 121 * RX frames to be processed by a tasklet and process them in the 122 * same order that they were received or TX status last. Hence, there 123 * is no race as long as the frame RX is processed before the next TX 124 * status, which drivers can ensure, see below. 125 * 126 * Note that this can only happen if the hardware or firmware can 127 * actually add STAs to the filter list, if this is done by the 128 * driver in response to set_tim() (which will only reduce the race 129 * this whole filtering tries to solve, not completely solve it) 130 * this situation cannot happen. 131 * 132 * To completely solve this race drivers need to make sure that they 133 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 134 * functions and 135 * (b) always process RX events before TX status events if ordering 136 * can be unknown, for example with different interrupt status 137 * bits. 138 * (c) if PS mode transitions are manual (i.e. the flag 139 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 140 * changes before calling TX status events if ordering can be 141 * unknown. 142 */ 143 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 144 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 145 skb_queue_tail(&sta->tx_filtered[ac], skb); 146 sta_info_recalc_tim(sta); 147 148 if (!timer_pending(&local->sta_cleanup)) 149 mod_timer(&local->sta_cleanup, 150 round_jiffies(jiffies + 151 STA_INFO_CLEANUP_INTERVAL)); 152 return; 153 } 154 155 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 156 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 157 /* Software retry the packet once */ 158 info->flags |= IEEE80211_TX_INTFL_RETRIED; 159 ieee80211_add_pending_skb(local, skb); 160 return; 161 } 162 163 ps_dbg_ratelimited(sta->sdata, 164 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 165 skb_queue_len(&sta->tx_filtered[ac]), 166 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 167 ieee80211_free_txskb(&local->hw, skb); 168 } 169 170 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 171 { 172 struct tid_ampdu_tx *tid_tx; 173 174 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 175 if (!tid_tx || !tid_tx->bar_pending) 176 return; 177 178 tid_tx->bar_pending = false; 179 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 180 } 181 182 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 183 { 184 struct ieee80211_mgmt *mgmt = (void *) skb->data; 185 struct ieee80211_local *local = sta->local; 186 struct ieee80211_sub_if_data *sdata = sta->sdata; 187 struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb); 188 189 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 190 sta->status_stats.last_ack = jiffies; 191 if (txinfo->status.is_valid_ack_signal) { 192 sta->status_stats.last_ack_signal = 193 (s8)txinfo->status.ack_signal; 194 sta->status_stats.ack_signal_filled = true; 195 ewma_avg_signal_add(&sta->status_stats.avg_ack_signal, 196 -txinfo->status.ack_signal); 197 } 198 } 199 200 if (ieee80211_is_data_qos(mgmt->frame_control)) { 201 struct ieee80211_hdr *hdr = (void *) skb->data; 202 u8 *qc = ieee80211_get_qos_ctl(hdr); 203 u16 tid = qc[0] & 0xf; 204 205 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 206 } 207 208 if (ieee80211_is_action(mgmt->frame_control) && 209 !ieee80211_has_protected(mgmt->frame_control) && 210 mgmt->u.action.category == WLAN_CATEGORY_HT && 211 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && 212 ieee80211_sdata_running(sdata)) { 213 enum ieee80211_smps_mode smps_mode; 214 215 switch (mgmt->u.action.u.ht_smps.smps_control) { 216 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 217 smps_mode = IEEE80211_SMPS_DYNAMIC; 218 break; 219 case WLAN_HT_SMPS_CONTROL_STATIC: 220 smps_mode = IEEE80211_SMPS_STATIC; 221 break; 222 case WLAN_HT_SMPS_CONTROL_DISABLED: 223 default: /* shouldn't happen since we don't send that */ 224 smps_mode = IEEE80211_SMPS_OFF; 225 break; 226 } 227 228 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 229 /* 230 * This update looks racy, but isn't -- if we come 231 * here we've definitely got a station that we're 232 * talking to, and on a managed interface that can 233 * only be the AP. And the only other place updating 234 * this variable in managed mode is before association. 235 */ 236 sdata->smps_mode = smps_mode; 237 ieee80211_queue_work(&local->hw, &sdata->recalc_smps); 238 } else if (sdata->vif.type == NL80211_IFTYPE_AP || 239 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 240 sta->known_smps_mode = smps_mode; 241 } 242 } 243 } 244 245 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 246 { 247 struct tid_ampdu_tx *tid_tx; 248 249 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 250 if (!tid_tx) 251 return; 252 253 tid_tx->failed_bar_ssn = ssn; 254 tid_tx->bar_pending = true; 255 } 256 257 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 258 { 259 int len = sizeof(struct ieee80211_radiotap_header); 260 261 /* IEEE80211_RADIOTAP_RATE rate */ 262 if (info->status.rates[0].idx >= 0 && 263 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 264 IEEE80211_TX_RC_VHT_MCS))) 265 len += 2; 266 267 /* IEEE80211_RADIOTAP_TX_FLAGS */ 268 len += 2; 269 270 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 271 len += 1; 272 273 /* IEEE80211_RADIOTAP_MCS 274 * IEEE80211_RADIOTAP_VHT */ 275 if (info->status.rates[0].idx >= 0) { 276 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 277 len += 3; 278 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) 279 len = ALIGN(len, 2) + 12; 280 } 281 282 return len; 283 } 284 285 static void 286 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, 287 struct ieee80211_supported_band *sband, 288 struct sk_buff *skb, int retry_count, 289 int rtap_len, int shift) 290 { 291 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 292 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 293 struct ieee80211_radiotap_header *rthdr; 294 unsigned char *pos; 295 u16 txflags; 296 297 rthdr = skb_push(skb, rtap_len); 298 299 memset(rthdr, 0, rtap_len); 300 rthdr->it_len = cpu_to_le16(rtap_len); 301 rthdr->it_present = 302 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 303 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 304 pos = (unsigned char *)(rthdr + 1); 305 306 /* 307 * XXX: Once radiotap gets the bitmap reset thing the vendor 308 * extensions proposal contains, we can actually report 309 * the whole set of tries we did. 310 */ 311 312 /* IEEE80211_RADIOTAP_RATE */ 313 if (info->status.rates[0].idx >= 0 && 314 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | 315 IEEE80211_TX_RC_VHT_MCS))) { 316 u16 rate; 317 318 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 319 rate = sband->bitrates[info->status.rates[0].idx].bitrate; 320 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); 321 /* padding for tx flags */ 322 pos += 2; 323 } 324 325 /* IEEE80211_RADIOTAP_TX_FLAGS */ 326 txflags = 0; 327 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 328 !is_multicast_ether_addr(hdr->addr1)) 329 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 330 331 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) 332 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 333 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 334 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 335 336 put_unaligned_le16(txflags, pos); 337 pos += 2; 338 339 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 340 /* for now report the total retry_count */ 341 *pos = retry_count; 342 pos++; 343 344 if (info->status.rates[0].idx < 0) 345 return; 346 347 /* IEEE80211_RADIOTAP_MCS 348 * IEEE80211_RADIOTAP_VHT */ 349 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 350 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 351 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 352 IEEE80211_RADIOTAP_MCS_HAVE_GI | 353 IEEE80211_RADIOTAP_MCS_HAVE_BW; 354 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 355 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 356 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 357 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 358 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 359 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 360 pos[2] = info->status.rates[0].idx; 361 pos += 3; 362 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { 363 u16 known = local->hw.radiotap_vht_details & 364 (IEEE80211_RADIOTAP_VHT_KNOWN_GI | 365 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); 366 367 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); 368 369 /* required alignment from rthdr */ 370 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); 371 372 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ 373 put_unaligned_le16(known, pos); 374 pos += 2; 375 376 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ 377 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 378 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; 379 pos++; 380 381 /* u8 bandwidth */ 382 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 383 *pos = 1; 384 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 385 *pos = 4; 386 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 387 *pos = 11; 388 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ 389 *pos = 0; 390 pos++; 391 392 /* u8 mcs_nss[4] */ 393 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | 394 ieee80211_rate_get_vht_nss(&info->status.rates[0]); 395 pos += 4; 396 397 /* u8 coding */ 398 pos++; 399 /* u8 group_id */ 400 pos++; 401 /* u16 partial_aid */ 402 pos += 2; 403 } 404 } 405 406 /* 407 * Handles the tx for TDLS teardown frames. 408 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP 409 */ 410 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local, 411 struct ieee80211_sub_if_data *sdata, 412 struct sk_buff *skb, u32 flags) 413 { 414 struct sk_buff *teardown_skb; 415 struct sk_buff *orig_teardown_skb; 416 bool is_teardown = false; 417 418 /* Get the teardown data we need and free the lock */ 419 spin_lock(&sdata->u.mgd.teardown_lock); 420 teardown_skb = sdata->u.mgd.teardown_skb; 421 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb; 422 if ((skb == orig_teardown_skb) && teardown_skb) { 423 sdata->u.mgd.teardown_skb = NULL; 424 sdata->u.mgd.orig_teardown_skb = NULL; 425 is_teardown = true; 426 } 427 spin_unlock(&sdata->u.mgd.teardown_lock); 428 429 if (is_teardown) { 430 /* This mechanism relies on being able to get ACKs */ 431 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)); 432 433 /* Check if peer has ACKed */ 434 if (flags & IEEE80211_TX_STAT_ACK) { 435 dev_kfree_skb_any(teardown_skb); 436 } else { 437 tdls_dbg(sdata, 438 "TDLS Resending teardown through AP\n"); 439 440 ieee80211_subif_start_xmit(teardown_skb, skb->dev); 441 } 442 } 443 } 444 445 static struct ieee80211_sub_if_data * 446 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb) 447 { 448 struct ieee80211_sub_if_data *sdata; 449 450 if (skb->dev) { 451 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 452 if (!sdata->dev) 453 continue; 454 455 if (skb->dev == sdata->dev) 456 return sdata; 457 } 458 459 return NULL; 460 } 461 462 return rcu_dereference(local->p2p_sdata); 463 } 464 465 static void ieee80211_report_ack_skb(struct ieee80211_local *local, 466 struct ieee80211_tx_info *info, 467 bool acked, bool dropped) 468 { 469 struct sk_buff *skb; 470 unsigned long flags; 471 472 spin_lock_irqsave(&local->ack_status_lock, flags); 473 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id); 474 spin_unlock_irqrestore(&local->ack_status_lock, flags); 475 476 if (!skb) 477 return; 478 479 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) { 480 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie; 481 struct ieee80211_sub_if_data *sdata; 482 struct ieee80211_hdr *hdr = (void *)skb->data; 483 484 rcu_read_lock(); 485 sdata = ieee80211_sdata_from_skb(local, skb); 486 if (sdata) { 487 if (ieee80211_is_nullfunc(hdr->frame_control) || 488 ieee80211_is_qos_nullfunc(hdr->frame_control)) 489 cfg80211_probe_status(sdata->dev, hdr->addr1, 490 cookie, acked, 491 info->status.ack_signal, 492 info->status.is_valid_ack_signal, 493 GFP_ATOMIC); 494 else 495 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, 496 skb->data, skb->len, 497 acked, GFP_ATOMIC); 498 } 499 rcu_read_unlock(); 500 501 dev_kfree_skb_any(skb); 502 } else if (dropped) { 503 dev_kfree_skb_any(skb); 504 } else { 505 /* consumes skb */ 506 skb_complete_wifi_ack(skb, acked); 507 } 508 } 509 510 static void ieee80211_report_used_skb(struct ieee80211_local *local, 511 struct sk_buff *skb, bool dropped) 512 { 513 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 514 struct ieee80211_hdr *hdr = (void *)skb->data; 515 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 516 517 if (dropped) 518 acked = false; 519 520 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { 521 struct ieee80211_sub_if_data *sdata; 522 523 rcu_read_lock(); 524 525 sdata = ieee80211_sdata_from_skb(local, skb); 526 527 if (!sdata) { 528 skb->dev = NULL; 529 } else { 530 unsigned int hdr_size = 531 ieee80211_hdrlen(hdr->frame_control); 532 533 /* Check to see if packet is a TDLS teardown packet */ 534 if (ieee80211_is_data(hdr->frame_control) && 535 (ieee80211_get_tdls_action(skb, hdr_size) == 536 WLAN_TDLS_TEARDOWN)) 537 ieee80211_tdls_td_tx_handle(local, sdata, skb, 538 info->flags); 539 else 540 ieee80211_mgd_conn_tx_status(sdata, 541 hdr->frame_control, 542 acked); 543 } 544 545 rcu_read_unlock(); 546 } else if (info->ack_frame_id) { 547 ieee80211_report_ack_skb(local, info, acked, dropped); 548 } 549 550 if (!dropped && skb->destructor) { 551 skb->wifi_acked_valid = 1; 552 skb->wifi_acked = acked; 553 } 554 555 ieee80211_led_tx(local); 556 557 if (skb_has_frag_list(skb)) { 558 kfree_skb_list(skb_shinfo(skb)->frag_list); 559 skb_shinfo(skb)->frag_list = NULL; 560 } 561 } 562 563 /* 564 * Use a static threshold for now, best value to be determined 565 * by testing ... 566 * Should it depend on: 567 * - on # of retransmissions 568 * - current throughput (higher value for higher tpt)? 569 */ 570 #define STA_LOST_PKT_THRESHOLD 50 571 #define STA_LOST_TDLS_PKT_THRESHOLD 10 572 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */ 573 574 static void ieee80211_lost_packet(struct sta_info *sta, 575 struct ieee80211_tx_info *info) 576 { 577 /* If driver relies on its own algorithm for station kickout, skip 578 * mac80211 packet loss mechanism. 579 */ 580 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK)) 581 return; 582 583 /* This packet was aggregated but doesn't carry status info */ 584 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 585 !(info->flags & IEEE80211_TX_STAT_AMPDU)) 586 return; 587 588 sta->status_stats.lost_packets++; 589 if (!sta->sta.tdls && 590 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD) 591 return; 592 593 /* 594 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD 595 * of the last packets were lost, and that no ACK was received in the 596 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss 597 * mechanism. 598 */ 599 if (sta->sta.tdls && 600 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD || 601 time_before(jiffies, 602 sta->status_stats.last_tdls_pkt_time + 603 STA_LOST_TDLS_PKT_TIME))) 604 return; 605 606 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 607 sta->status_stats.lost_packets, GFP_ATOMIC); 608 sta->status_stats.lost_packets = 0; 609 } 610 611 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw, 612 struct ieee80211_tx_info *info, 613 int *retry_count) 614 { 615 int rates_idx = -1; 616 int count = -1; 617 int i; 618 619 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 620 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 621 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 622 /* just the first aggr frame carry status info */ 623 info->status.rates[i].idx = -1; 624 info->status.rates[i].count = 0; 625 break; 626 } else if (info->status.rates[i].idx < 0) { 627 break; 628 } else if (i >= hw->max_report_rates) { 629 /* the HW cannot have attempted that rate */ 630 info->status.rates[i].idx = -1; 631 info->status.rates[i].count = 0; 632 break; 633 } 634 635 count += info->status.rates[i].count; 636 } 637 rates_idx = i - 1; 638 639 if (count < 0) 640 count = 0; 641 642 *retry_count = count; 643 return rates_idx; 644 } 645 646 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb, 647 struct ieee80211_supported_band *sband, 648 int retry_count, int shift, bool send_to_cooked) 649 { 650 struct sk_buff *skb2; 651 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 652 struct ieee80211_sub_if_data *sdata; 653 struct net_device *prev_dev = NULL; 654 int rtap_len; 655 656 /* send frame to monitor interfaces now */ 657 rtap_len = ieee80211_tx_radiotap_len(info); 658 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 659 pr_err("ieee80211_tx_status: headroom too small\n"); 660 dev_kfree_skb(skb); 661 return; 662 } 663 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, 664 rtap_len, shift); 665 666 /* XXX: is this sufficient for BPF? */ 667 skb_reset_mac_header(skb); 668 skb->ip_summed = CHECKSUM_UNNECESSARY; 669 skb->pkt_type = PACKET_OTHERHOST; 670 skb->protocol = htons(ETH_P_802_2); 671 memset(skb->cb, 0, sizeof(skb->cb)); 672 673 rcu_read_lock(); 674 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 675 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 676 if (!ieee80211_sdata_running(sdata)) 677 continue; 678 679 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) && 680 !send_to_cooked) 681 continue; 682 683 if (prev_dev) { 684 skb2 = skb_clone(skb, GFP_ATOMIC); 685 if (skb2) { 686 skb2->dev = prev_dev; 687 netif_rx(skb2); 688 } 689 } 690 691 prev_dev = sdata->dev; 692 } 693 } 694 if (prev_dev) { 695 skb->dev = prev_dev; 696 netif_rx(skb); 697 skb = NULL; 698 } 699 rcu_read_unlock(); 700 dev_kfree_skb(skb); 701 } 702 703 static void __ieee80211_tx_status(struct ieee80211_hw *hw, 704 struct ieee80211_tx_status *status) 705 { 706 struct sk_buff *skb = status->skb; 707 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 708 struct ieee80211_local *local = hw_to_local(hw); 709 struct ieee80211_tx_info *info = status->info; 710 struct sta_info *sta; 711 __le16 fc; 712 struct ieee80211_supported_band *sband; 713 int retry_count; 714 int rates_idx; 715 bool send_to_cooked; 716 bool acked; 717 struct ieee80211_bar *bar; 718 int shift = 0; 719 int tid = IEEE80211_NUM_TIDS; 720 721 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count); 722 723 sband = local->hw.wiphy->bands[info->band]; 724 fc = hdr->frame_control; 725 726 if (status->sta) { 727 sta = container_of(status->sta, struct sta_info, sta); 728 shift = ieee80211_vif_get_shift(&sta->sdata->vif); 729 730 if (info->flags & IEEE80211_TX_STATUS_EOSP) 731 clear_sta_flag(sta, WLAN_STA_SP); 732 733 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 734 735 /* mesh Peer Service Period support */ 736 if (ieee80211_vif_is_mesh(&sta->sdata->vif) && 737 ieee80211_is_data_qos(fc)) 738 ieee80211_mpsp_trigger_process( 739 ieee80211_get_qos_ctl(hdr), sta, true, acked); 740 741 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 742 /* 743 * The STA is in power save mode, so assume 744 * that this TX packet failed because of that. 745 */ 746 ieee80211_handle_filtered_frame(local, sta, skb); 747 return; 748 } 749 750 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) && 751 (ieee80211_is_data(hdr->frame_control)) && 752 (rates_idx != -1)) 753 sta->tx_stats.last_rate = 754 info->status.rates[rates_idx]; 755 756 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 757 (ieee80211_is_data_qos(fc))) { 758 u16 ssn; 759 u8 *qc; 760 761 qc = ieee80211_get_qos_ctl(hdr); 762 tid = qc[0] & 0xf; 763 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 764 & IEEE80211_SCTL_SEQ); 765 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 766 tid, ssn); 767 } else if (ieee80211_is_data_qos(fc)) { 768 u8 *qc = ieee80211_get_qos_ctl(hdr); 769 770 tid = qc[0] & 0xf; 771 } 772 773 if (!acked && ieee80211_is_back_req(fc)) { 774 u16 control; 775 776 /* 777 * BAR failed, store the last SSN and retry sending 778 * the BAR when the next unicast transmission on the 779 * same TID succeeds. 780 */ 781 bar = (struct ieee80211_bar *) skb->data; 782 control = le16_to_cpu(bar->control); 783 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 784 u16 ssn = le16_to_cpu(bar->start_seq_num); 785 786 tid = (control & 787 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 788 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 789 790 ieee80211_set_bar_pending(sta, tid, ssn); 791 } 792 } 793 794 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 795 ieee80211_handle_filtered_frame(local, sta, skb); 796 return; 797 } else { 798 if (!acked) 799 sta->status_stats.retry_failed++; 800 sta->status_stats.retry_count += retry_count; 801 802 if (ieee80211_is_data_present(fc)) { 803 if (!acked) 804 sta->status_stats.msdu_failed[tid]++; 805 806 sta->status_stats.msdu_retries[tid] += 807 retry_count; 808 } 809 } 810 811 rate_control_tx_status(local, sband, status); 812 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 813 ieee80211s_update_metric(local, sta, status); 814 815 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 816 ieee80211_frame_acked(sta, skb); 817 818 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 819 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) 820 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, 821 acked, info->status.tx_time); 822 823 if (info->status.tx_time && 824 wiphy_ext_feature_isset(local->hw.wiphy, 825 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 826 ieee80211_sta_register_airtime(&sta->sta, tid, 827 info->status.tx_time, 0); 828 829 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) { 830 if (info->flags & IEEE80211_TX_STAT_ACK) { 831 if (sta->status_stats.lost_packets) 832 sta->status_stats.lost_packets = 0; 833 834 /* Track when last TDLS packet was ACKed */ 835 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 836 sta->status_stats.last_tdls_pkt_time = 837 jiffies; 838 } else { 839 ieee80211_lost_packet(sta, info); 840 } 841 } 842 } 843 844 /* SNMP counters 845 * Fragments are passed to low-level drivers as separate skbs, so these 846 * are actually fragments, not frames. Update frame counters only for 847 * the first fragment of the frame. */ 848 if ((info->flags & IEEE80211_TX_STAT_ACK) || 849 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) { 850 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 851 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 852 if (is_multicast_ether_addr(ieee80211_get_DA(hdr))) 853 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 854 if (retry_count > 0) 855 I802_DEBUG_INC(local->dot11RetryCount); 856 if (retry_count > 1) 857 I802_DEBUG_INC(local->dot11MultipleRetryCount); 858 } 859 860 /* This counter shall be incremented for an acknowledged MPDU 861 * with an individual address in the address 1 field or an MPDU 862 * with a multicast address in the address 1 field of type Data 863 * or Management. */ 864 if (!is_multicast_ether_addr(hdr->addr1) || 865 ieee80211_is_data(fc) || 866 ieee80211_is_mgmt(fc)) 867 I802_DEBUG_INC(local->dot11TransmittedFragmentCount); 868 } else { 869 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 870 I802_DEBUG_INC(local->dot11FailedCount); 871 } 872 873 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 874 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) && 875 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 876 local->ps_sdata && !(local->scanning)) { 877 if (info->flags & IEEE80211_TX_STAT_ACK) { 878 local->ps_sdata->u.mgd.flags |= 879 IEEE80211_STA_NULLFUNC_ACKED; 880 } else 881 mod_timer(&local->dynamic_ps_timer, jiffies + 882 msecs_to_jiffies(10)); 883 } 884 885 ieee80211_report_used_skb(local, skb, false); 886 887 /* this was a transmitted frame, but now we want to reuse it */ 888 skb_orphan(skb); 889 890 /* Need to make a copy before skb->cb gets cleared */ 891 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 892 !(ieee80211_is_data(fc)); 893 894 /* 895 * This is a bit racy but we can avoid a lot of work 896 * with this test... 897 */ 898 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 899 dev_kfree_skb(skb); 900 return; 901 } 902 903 /* send to monitor interfaces */ 904 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked); 905 } 906 907 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 908 { 909 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 910 struct ieee80211_local *local = hw_to_local(hw); 911 struct ieee80211_tx_status status = { 912 .skb = skb, 913 .info = IEEE80211_SKB_CB(skb), 914 }; 915 struct rhlist_head *tmp; 916 struct sta_info *sta; 917 918 rcu_read_lock(); 919 920 for_each_sta_info(local, hdr->addr1, sta, tmp) { 921 /* skip wrong virtual interface */ 922 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 923 continue; 924 925 status.sta = &sta->sta; 926 break; 927 } 928 929 __ieee80211_tx_status(hw, &status); 930 rcu_read_unlock(); 931 } 932 EXPORT_SYMBOL(ieee80211_tx_status); 933 934 void ieee80211_tx_status_ext(struct ieee80211_hw *hw, 935 struct ieee80211_tx_status *status) 936 { 937 struct ieee80211_local *local = hw_to_local(hw); 938 struct ieee80211_tx_info *info = status->info; 939 struct ieee80211_sta *pubsta = status->sta; 940 struct ieee80211_supported_band *sband; 941 int retry_count; 942 bool acked, noack_success; 943 944 if (status->skb) 945 return __ieee80211_tx_status(hw, status); 946 947 if (!status->sta) 948 return; 949 950 ieee80211_tx_get_rates(hw, info, &retry_count); 951 952 sband = hw->wiphy->bands[info->band]; 953 954 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 955 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED); 956 957 if (pubsta) { 958 struct sta_info *sta; 959 960 sta = container_of(pubsta, struct sta_info, sta); 961 962 if (!acked) 963 sta->status_stats.retry_failed++; 964 sta->status_stats.retry_count += retry_count; 965 966 if (acked) { 967 sta->status_stats.last_ack = jiffies; 968 969 if (sta->status_stats.lost_packets) 970 sta->status_stats.lost_packets = 0; 971 972 /* Track when last TDLS packet was ACKed */ 973 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) 974 sta->status_stats.last_tdls_pkt_time = jiffies; 975 } else if (test_sta_flag(sta, WLAN_STA_PS_STA)) { 976 return; 977 } else { 978 ieee80211_lost_packet(sta, info); 979 } 980 981 rate_control_tx_status(local, sband, status); 982 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 983 ieee80211s_update_metric(local, sta, status); 984 } 985 986 if (acked || noack_success) { 987 I802_DEBUG_INC(local->dot11TransmittedFrameCount); 988 if (!pubsta) 989 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount); 990 if (retry_count > 0) 991 I802_DEBUG_INC(local->dot11RetryCount); 992 if (retry_count > 1) 993 I802_DEBUG_INC(local->dot11MultipleRetryCount); 994 } else { 995 I802_DEBUG_INC(local->dot11FailedCount); 996 } 997 } 998 EXPORT_SYMBOL(ieee80211_tx_status_ext); 999 1000 void ieee80211_tx_rate_update(struct ieee80211_hw *hw, 1001 struct ieee80211_sta *pubsta, 1002 struct ieee80211_tx_info *info) 1003 { 1004 struct ieee80211_local *local = hw_to_local(hw); 1005 struct ieee80211_supported_band *sband = hw->wiphy->bands[info->band]; 1006 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1007 struct ieee80211_tx_status status = { 1008 .info = info, 1009 .sta = pubsta, 1010 }; 1011 1012 rate_control_tx_status(local, sband, &status); 1013 1014 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) 1015 sta->tx_stats.last_rate = info->status.rates[0]; 1016 } 1017 EXPORT_SYMBOL(ieee80211_tx_rate_update); 1018 1019 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 1020 { 1021 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 1022 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 1023 num_packets, GFP_ATOMIC); 1024 } 1025 EXPORT_SYMBOL(ieee80211_report_low_ack); 1026 1027 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 1028 { 1029 struct ieee80211_local *local = hw_to_local(hw); 1030 1031 ieee80211_report_used_skb(local, skb, true); 1032 dev_kfree_skb_any(skb); 1033 } 1034 EXPORT_SYMBOL(ieee80211_free_txskb); 1035 1036 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 1037 struct sk_buff_head *skbs) 1038 { 1039 struct sk_buff *skb; 1040 1041 while ((skb = __skb_dequeue(skbs))) 1042 ieee80211_free_txskb(hw, skb); 1043 } 1044