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 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/export.h> 13 #include <linux/etherdevice.h> 14 #include <net/mac80211.h> 15 #include <asm/unaligned.h> 16 #include "ieee80211_i.h" 17 #include "rate.h" 18 #include "mesh.h" 19 #include "led.h" 20 #include "wme.h" 21 22 23 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, 24 struct sk_buff *skb) 25 { 26 struct ieee80211_local *local = hw_to_local(hw); 27 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 28 int tmp; 29 30 skb->pkt_type = IEEE80211_TX_STATUS_MSG; 31 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ? 32 &local->skb_queue : &local->skb_queue_unreliable, skb); 33 tmp = skb_queue_len(&local->skb_queue) + 34 skb_queue_len(&local->skb_queue_unreliable); 35 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT && 36 (skb = skb_dequeue(&local->skb_queue_unreliable))) { 37 ieee80211_free_txskb(hw, skb); 38 tmp--; 39 I802_DEBUG_INC(local->tx_status_drop); 40 } 41 tasklet_schedule(&local->tasklet); 42 } 43 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); 44 45 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, 46 struct sta_info *sta, 47 struct sk_buff *skb) 48 { 49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 50 struct ieee80211_hdr *hdr = (void *)skb->data; 51 int ac; 52 53 /* 54 * This skb 'survived' a round-trip through the driver, and 55 * hopefully the driver didn't mangle it too badly. However, 56 * we can definitely not rely on the control information 57 * being correct. Clear it so we don't get junk there, and 58 * indicate that it needs new processing, but must not be 59 * modified/encrypted again. 60 */ 61 memset(&info->control, 0, sizeof(info->control)); 62 63 info->control.jiffies = jiffies; 64 info->control.vif = &sta->sdata->vif; 65 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 66 IEEE80211_TX_INTFL_RETRANSMISSION; 67 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 68 69 sta->tx_filtered_count++; 70 71 /* 72 * Clear more-data bit on filtered frames, it might be set 73 * but later frames might time out so it might have to be 74 * clear again ... It's all rather unlikely (this frame 75 * should time out first, right?) but let's not confuse 76 * peers unnecessarily. 77 */ 78 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 79 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 80 81 if (ieee80211_is_data_qos(hdr->frame_control)) { 82 u8 *p = ieee80211_get_qos_ctl(hdr); 83 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 84 85 /* 86 * Clear EOSP if set, this could happen e.g. 87 * if an absence period (us being a P2P GO) 88 * shortens the SP. 89 */ 90 if (*p & IEEE80211_QOS_CTL_EOSP) 91 *p &= ~IEEE80211_QOS_CTL_EOSP; 92 ac = ieee802_1d_to_ac[tid & 7]; 93 } else { 94 ac = IEEE80211_AC_BE; 95 } 96 97 /* 98 * Clear the TX filter mask for this STA when sending the next 99 * packet. If the STA went to power save mode, this will happen 100 * when it wakes up for the next time. 101 */ 102 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 103 104 /* 105 * This code races in the following way: 106 * 107 * (1) STA sends frame indicating it will go to sleep and does so 108 * (2) hardware/firmware adds STA to filter list, passes frame up 109 * (3) hardware/firmware processes TX fifo and suppresses a frame 110 * (4) we get TX status before having processed the frame and 111 * knowing that the STA has gone to sleep. 112 * 113 * This is actually quite unlikely even when both those events are 114 * processed from interrupts coming in quickly after one another or 115 * even at the same time because we queue both TX status events and 116 * RX frames to be processed by a tasklet and process them in the 117 * same order that they were received or TX status last. Hence, there 118 * is no race as long as the frame RX is processed before the next TX 119 * status, which drivers can ensure, see below. 120 * 121 * Note that this can only happen if the hardware or firmware can 122 * actually add STAs to the filter list, if this is done by the 123 * driver in response to set_tim() (which will only reduce the race 124 * this whole filtering tries to solve, not completely solve it) 125 * this situation cannot happen. 126 * 127 * To completely solve this race drivers need to make sure that they 128 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 129 * functions and 130 * (b) always process RX events before TX status events if ordering 131 * can be unknown, for example with different interrupt status 132 * bits. 133 * (c) if PS mode transitions are manual (i.e. the flag 134 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 135 * changes before calling TX status events if ordering can be 136 * unknown. 137 */ 138 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 139 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 140 skb_queue_tail(&sta->tx_filtered[ac], skb); 141 sta_info_recalc_tim(sta); 142 143 if (!timer_pending(&local->sta_cleanup)) 144 mod_timer(&local->sta_cleanup, 145 round_jiffies(jiffies + 146 STA_INFO_CLEANUP_INTERVAL)); 147 return; 148 } 149 150 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 151 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 152 /* Software retry the packet once */ 153 info->flags |= IEEE80211_TX_INTFL_RETRIED; 154 ieee80211_add_pending_skb(local, skb); 155 return; 156 } 157 158 ps_dbg_ratelimited(sta->sdata, 159 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 160 skb_queue_len(&sta->tx_filtered[ac]), 161 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 162 ieee80211_free_txskb(&local->hw, skb); 163 } 164 165 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 166 { 167 struct tid_ampdu_tx *tid_tx; 168 169 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 170 if (!tid_tx || !tid_tx->bar_pending) 171 return; 172 173 tid_tx->bar_pending = false; 174 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 175 } 176 177 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 178 { 179 struct ieee80211_mgmt *mgmt = (void *) skb->data; 180 struct ieee80211_local *local = sta->local; 181 struct ieee80211_sub_if_data *sdata = sta->sdata; 182 183 if (ieee80211_is_data_qos(mgmt->frame_control)) { 184 struct ieee80211_hdr *hdr = (void *) skb->data; 185 u8 *qc = ieee80211_get_qos_ctl(hdr); 186 u16 tid = qc[0] & 0xf; 187 188 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 189 } 190 191 if (ieee80211_is_action(mgmt->frame_control) && 192 sdata->vif.type == NL80211_IFTYPE_STATION && 193 mgmt->u.action.category == WLAN_CATEGORY_HT && 194 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) { 195 /* 196 * This update looks racy, but isn't -- if we come 197 * here we've definitely got a station that we're 198 * talking to, and on a managed interface that can 199 * only be the AP. And the only other place updating 200 * this variable is before we're associated. 201 */ 202 switch (mgmt->u.action.u.ht_smps.smps_control) { 203 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 204 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC; 205 break; 206 case WLAN_HT_SMPS_CONTROL_STATIC: 207 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC; 208 break; 209 case WLAN_HT_SMPS_CONTROL_DISABLED: 210 default: /* shouldn't happen since we don't send that */ 211 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF; 212 break; 213 } 214 215 ieee80211_queue_work(&local->hw, &local->recalc_smps); 216 } 217 } 218 219 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 220 { 221 struct tid_ampdu_tx *tid_tx; 222 223 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 224 if (!tid_tx) 225 return; 226 227 tid_tx->failed_bar_ssn = ssn; 228 tid_tx->bar_pending = true; 229 } 230 231 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 232 { 233 int len = sizeof(struct ieee80211_radiotap_header); 234 235 /* IEEE80211_RADIOTAP_RATE rate */ 236 if (info->status.rates[0].idx >= 0 && 237 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 238 len += 2; 239 240 /* IEEE80211_RADIOTAP_TX_FLAGS */ 241 len += 2; 242 243 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 244 len += 1; 245 246 /* IEEE80211_TX_RC_MCS */ 247 if (info->status.rates[0].idx >= 0 && 248 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 249 len += 3; 250 251 return len; 252 } 253 254 static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band 255 *sband, struct sk_buff *skb, 256 int retry_count, int rtap_len) 257 { 258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 259 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 260 struct ieee80211_radiotap_header *rthdr; 261 unsigned char *pos; 262 u16 txflags; 263 264 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 265 266 memset(rthdr, 0, rtap_len); 267 rthdr->it_len = cpu_to_le16(rtap_len); 268 rthdr->it_present = 269 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 270 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 271 pos = (unsigned char *)(rthdr + 1); 272 273 /* 274 * XXX: Once radiotap gets the bitmap reset thing the vendor 275 * extensions proposal contains, we can actually report 276 * the whole set of tries we did. 277 */ 278 279 /* IEEE80211_RADIOTAP_RATE */ 280 if (info->status.rates[0].idx >= 0 && 281 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) { 282 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 283 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5; 284 /* padding for tx flags */ 285 pos += 2; 286 } 287 288 /* IEEE80211_RADIOTAP_TX_FLAGS */ 289 txflags = 0; 290 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 291 !is_multicast_ether_addr(hdr->addr1)) 292 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 293 294 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 295 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 296 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 297 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 298 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 299 300 put_unaligned_le16(txflags, pos); 301 pos += 2; 302 303 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 304 /* for now report the total retry_count */ 305 *pos = retry_count; 306 pos++; 307 308 /* IEEE80211_TX_RC_MCS */ 309 if (info->status.rates[0].idx >= 0 && 310 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 311 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 312 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 313 IEEE80211_RADIOTAP_MCS_HAVE_GI | 314 IEEE80211_RADIOTAP_MCS_HAVE_BW; 315 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 316 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 317 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 318 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 319 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 320 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 321 pos[2] = info->status.rates[0].idx; 322 pos += 3; 323 } 324 325 } 326 327 /* 328 * Use a static threshold for now, best value to be determined 329 * by testing ... 330 * Should it depend on: 331 * - on # of retransmissions 332 * - current throughput (higher value for higher tpt)? 333 */ 334 #define STA_LOST_PKT_THRESHOLD 50 335 336 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 337 { 338 struct sk_buff *skb2; 339 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 340 struct ieee80211_local *local = hw_to_local(hw); 341 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 342 __le16 fc; 343 struct ieee80211_supported_band *sband; 344 struct ieee80211_sub_if_data *sdata; 345 struct net_device *prev_dev = NULL; 346 struct sta_info *sta, *tmp; 347 int retry_count = -1, i; 348 int rates_idx = -1; 349 bool send_to_cooked; 350 bool acked; 351 struct ieee80211_bar *bar; 352 int rtap_len; 353 354 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 355 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 356 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 357 /* just the first aggr frame carry status info */ 358 info->status.rates[i].idx = -1; 359 info->status.rates[i].count = 0; 360 break; 361 } else if (info->status.rates[i].idx < 0) { 362 break; 363 } else if (i >= hw->max_report_rates) { 364 /* the HW cannot have attempted that rate */ 365 info->status.rates[i].idx = -1; 366 info->status.rates[i].count = 0; 367 break; 368 } 369 370 retry_count += info->status.rates[i].count; 371 } 372 rates_idx = i - 1; 373 374 if (retry_count < 0) 375 retry_count = 0; 376 377 rcu_read_lock(); 378 379 sband = local->hw.wiphy->bands[info->band]; 380 fc = hdr->frame_control; 381 382 for_each_sta_info(local, hdr->addr1, sta, tmp) { 383 /* skip wrong virtual interface */ 384 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 385 continue; 386 387 if (info->flags & IEEE80211_TX_STATUS_EOSP) 388 clear_sta_flag(sta, WLAN_STA_SP); 389 390 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 391 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 392 /* 393 * The STA is in power save mode, so assume 394 * that this TX packet failed because of that. 395 */ 396 ieee80211_handle_filtered_frame(local, sta, skb); 397 rcu_read_unlock(); 398 return; 399 } 400 401 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 402 (rates_idx != -1)) 403 sta->last_tx_rate = info->status.rates[rates_idx]; 404 405 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 406 (ieee80211_is_data_qos(fc))) { 407 u16 tid, ssn; 408 u8 *qc; 409 410 qc = ieee80211_get_qos_ctl(hdr); 411 tid = qc[0] & 0xf; 412 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 413 & IEEE80211_SCTL_SEQ); 414 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 415 tid, ssn); 416 } 417 418 if (!acked && ieee80211_is_back_req(fc)) { 419 u16 tid, control; 420 421 /* 422 * BAR failed, store the last SSN and retry sending 423 * the BAR when the next unicast transmission on the 424 * same TID succeeds. 425 */ 426 bar = (struct ieee80211_bar *) skb->data; 427 control = le16_to_cpu(bar->control); 428 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 429 u16 ssn = le16_to_cpu(bar->start_seq_num); 430 431 tid = (control & 432 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 433 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 434 435 ieee80211_set_bar_pending(sta, tid, ssn); 436 } 437 } 438 439 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 440 ieee80211_handle_filtered_frame(local, sta, skb); 441 rcu_read_unlock(); 442 return; 443 } else { 444 if (!acked) 445 sta->tx_retry_failed++; 446 sta->tx_retry_count += retry_count; 447 } 448 449 rate_control_tx_status(local, sband, sta, skb); 450 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 451 ieee80211s_update_metric(local, sta, skb); 452 453 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 454 ieee80211_frame_acked(sta, skb); 455 456 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 457 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 458 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked); 459 460 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 461 if (info->flags & IEEE80211_TX_STAT_ACK) { 462 if (sta->lost_packets) 463 sta->lost_packets = 0; 464 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) { 465 cfg80211_cqm_pktloss_notify(sta->sdata->dev, 466 sta->sta.addr, 467 sta->lost_packets, 468 GFP_ATOMIC); 469 sta->lost_packets = 0; 470 } 471 } 472 } 473 474 rcu_read_unlock(); 475 476 ieee80211_led_tx(local, 0); 477 478 /* SNMP counters 479 * Fragments are passed to low-level drivers as separate skbs, so these 480 * are actually fragments, not frames. Update frame counters only for 481 * the first fragment of the frame. */ 482 if (info->flags & IEEE80211_TX_STAT_ACK) { 483 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 484 local->dot11TransmittedFrameCount++; 485 if (is_multicast_ether_addr(hdr->addr1)) 486 local->dot11MulticastTransmittedFrameCount++; 487 if (retry_count > 0) 488 local->dot11RetryCount++; 489 if (retry_count > 1) 490 local->dot11MultipleRetryCount++; 491 } 492 493 /* This counter shall be incremented for an acknowledged MPDU 494 * with an individual address in the address 1 field or an MPDU 495 * with a multicast address in the address 1 field of type Data 496 * or Management. */ 497 if (!is_multicast_ether_addr(hdr->addr1) || 498 ieee80211_is_data(fc) || 499 ieee80211_is_mgmt(fc)) 500 local->dot11TransmittedFragmentCount++; 501 } else { 502 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 503 local->dot11FailedCount++; 504 } 505 506 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 507 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 508 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 509 local->ps_sdata && !(local->scanning)) { 510 if (info->flags & IEEE80211_TX_STAT_ACK) { 511 local->ps_sdata->u.mgd.flags |= 512 IEEE80211_STA_NULLFUNC_ACKED; 513 } else 514 mod_timer(&local->dynamic_ps_timer, jiffies + 515 msecs_to_jiffies(10)); 516 } 517 518 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) { 519 u64 cookie = (unsigned long)skb; 520 bool found = false; 521 522 acked = info->flags & IEEE80211_TX_STAT_ACK; 523 524 rcu_read_lock(); 525 526 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 527 if (!sdata->dev) 528 continue; 529 530 if (skb->dev != sdata->dev) 531 continue; 532 533 found = true; 534 break; 535 } 536 537 if (!skb->dev) { 538 sdata = rcu_dereference(local->p2p_sdata); 539 if (sdata) 540 found = true; 541 } 542 543 if (!found) 544 skb->dev = NULL; 545 else if (ieee80211_is_nullfunc(hdr->frame_control) || 546 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 547 cfg80211_probe_status(sdata->dev, hdr->addr1, 548 cookie, acked, GFP_ATOMIC); 549 } else { 550 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data, 551 skb->len, acked, GFP_ATOMIC); 552 } 553 554 rcu_read_unlock(); 555 } 556 557 if (unlikely(info->ack_frame_id)) { 558 struct sk_buff *ack_skb; 559 unsigned long flags; 560 561 spin_lock_irqsave(&local->ack_status_lock, flags); 562 ack_skb = idr_find(&local->ack_status_frames, 563 info->ack_frame_id); 564 if (ack_skb) 565 idr_remove(&local->ack_status_frames, 566 info->ack_frame_id); 567 spin_unlock_irqrestore(&local->ack_status_lock, flags); 568 569 /* consumes ack_skb */ 570 if (ack_skb) 571 skb_complete_wifi_ack(ack_skb, 572 info->flags & IEEE80211_TX_STAT_ACK); 573 } 574 575 /* this was a transmitted frame, but now we want to reuse it */ 576 skb_orphan(skb); 577 578 /* Need to make a copy before skb->cb gets cleared */ 579 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 580 !(ieee80211_is_data(fc)); 581 582 /* 583 * This is a bit racy but we can avoid a lot of work 584 * with this test... 585 */ 586 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 587 dev_kfree_skb(skb); 588 return; 589 } 590 591 /* send frame to monitor interfaces now */ 592 rtap_len = ieee80211_tx_radiotap_len(info); 593 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 594 pr_err("ieee80211_tx_status: headroom too small\n"); 595 dev_kfree_skb(skb); 596 return; 597 } 598 ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len); 599 600 /* XXX: is this sufficient for BPF? */ 601 skb_set_mac_header(skb, 0); 602 skb->ip_summed = CHECKSUM_UNNECESSARY; 603 skb->pkt_type = PACKET_OTHERHOST; 604 skb->protocol = htons(ETH_P_802_2); 605 memset(skb->cb, 0, sizeof(skb->cb)); 606 607 rcu_read_lock(); 608 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 609 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 610 if (!ieee80211_sdata_running(sdata)) 611 continue; 612 613 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 614 !send_to_cooked) 615 continue; 616 617 if (prev_dev) { 618 skb2 = skb_clone(skb, GFP_ATOMIC); 619 if (skb2) { 620 skb2->dev = prev_dev; 621 netif_rx(skb2); 622 } 623 } 624 625 prev_dev = sdata->dev; 626 } 627 } 628 if (prev_dev) { 629 skb->dev = prev_dev; 630 netif_rx(skb); 631 skb = NULL; 632 } 633 rcu_read_unlock(); 634 dev_kfree_skb(skb); 635 } 636 EXPORT_SYMBOL(ieee80211_tx_status); 637 638 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 639 { 640 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 641 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 642 num_packets, GFP_ATOMIC); 643 } 644 EXPORT_SYMBOL(ieee80211_report_low_ack); 645 646 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 647 { 648 struct ieee80211_local *local = hw_to_local(hw); 649 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 650 651 if (unlikely(info->ack_frame_id)) { 652 struct sk_buff *ack_skb; 653 unsigned long flags; 654 655 spin_lock_irqsave(&local->ack_status_lock, flags); 656 ack_skb = idr_find(&local->ack_status_frames, 657 info->ack_frame_id); 658 if (ack_skb) 659 idr_remove(&local->ack_status_frames, 660 info->ack_frame_id); 661 spin_unlock_irqrestore(&local->ack_status_lock, flags); 662 663 /* consumes ack_skb */ 664 if (ack_skb) 665 dev_kfree_skb_any(ack_skb); 666 } 667 668 dev_kfree_skb_any(skb); 669 } 670 EXPORT_SYMBOL(ieee80211_free_txskb); 671 672 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, 673 struct sk_buff_head *skbs) 674 { 675 struct sk_buff *skb; 676 677 while ((skb = __skb_dequeue(skbs))) 678 ieee80211_free_txskb(hw, skb); 679 } 680