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 <net/mac80211.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 dev_kfree_skb_irq(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 /* 52 * This skb 'survived' a round-trip through the driver, and 53 * hopefully the driver didn't mangle it too badly. However, 54 * we can definitely not rely on the control information 55 * being correct. Clear it so we don't get junk there, and 56 * indicate that it needs new processing, but must not be 57 * modified/encrypted again. 58 */ 59 memset(&info->control, 0, sizeof(info->control)); 60 61 info->control.jiffies = jiffies; 62 info->control.vif = &sta->sdata->vif; 63 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | 64 IEEE80211_TX_INTFL_RETRANSMISSION; 65 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 66 67 sta->tx_filtered_count++; 68 69 /* 70 * Clear more-data bit on filtered frames, it might be set 71 * but later frames might time out so it might have to be 72 * clear again ... It's all rather unlikely (this frame 73 * should time out first, right?) but let's not confuse 74 * peers unnecessarily. 75 */ 76 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) 77 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); 78 79 if (ieee80211_is_data_qos(hdr->frame_control)) { 80 u8 *p = ieee80211_get_qos_ctl(hdr); 81 int tid = *p & IEEE80211_QOS_CTL_TID_MASK; 82 83 /* 84 * Clear EOSP if set, this could happen e.g. 85 * if an absence period (us being a P2P GO) 86 * shortens the SP. 87 */ 88 if (*p & IEEE80211_QOS_CTL_EOSP) 89 *p &= ~IEEE80211_QOS_CTL_EOSP; 90 ac = ieee802_1d_to_ac[tid & 7]; 91 } else { 92 ac = IEEE80211_AC_BE; 93 } 94 95 /* 96 * Clear the TX filter mask for this STA when sending the next 97 * packet. If the STA went to power save mode, this will happen 98 * when it wakes up for the next time. 99 */ 100 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); 101 102 /* 103 * This code races in the following way: 104 * 105 * (1) STA sends frame indicating it will go to sleep and does so 106 * (2) hardware/firmware adds STA to filter list, passes frame up 107 * (3) hardware/firmware processes TX fifo and suppresses a frame 108 * (4) we get TX status before having processed the frame and 109 * knowing that the STA has gone to sleep. 110 * 111 * This is actually quite unlikely even when both those events are 112 * processed from interrupts coming in quickly after one another or 113 * even at the same time because we queue both TX status events and 114 * RX frames to be processed by a tasklet and process them in the 115 * same order that they were received or TX status last. Hence, there 116 * is no race as long as the frame RX is processed before the next TX 117 * status, which drivers can ensure, see below. 118 * 119 * Note that this can only happen if the hardware or firmware can 120 * actually add STAs to the filter list, if this is done by the 121 * driver in response to set_tim() (which will only reduce the race 122 * this whole filtering tries to solve, not completely solve it) 123 * this situation cannot happen. 124 * 125 * To completely solve this race drivers need to make sure that they 126 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing 127 * functions and 128 * (b) always process RX events before TX status events if ordering 129 * can be unknown, for example with different interrupt status 130 * bits. 131 * (c) if PS mode transitions are manual (i.e. the flag 132 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state 133 * changes before calling TX status events if ordering can be 134 * unknown. 135 */ 136 if (test_sta_flag(sta, WLAN_STA_PS_STA) && 137 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { 138 skb_queue_tail(&sta->tx_filtered[ac], skb); 139 sta_info_recalc_tim(sta); 140 141 if (!timer_pending(&local->sta_cleanup)) 142 mod_timer(&local->sta_cleanup, 143 round_jiffies(jiffies + 144 STA_INFO_CLEANUP_INTERVAL)); 145 return; 146 } 147 148 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 149 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { 150 /* Software retry the packet once */ 151 info->flags |= IEEE80211_TX_INTFL_RETRIED; 152 ieee80211_add_pending_skb(local, skb); 153 return; 154 } 155 156 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 157 if (net_ratelimit()) 158 wiphy_debug(local->hw.wiphy, 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 #endif 163 dev_kfree_skb(skb); 164 } 165 166 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 167 { 168 struct tid_ampdu_tx *tid_tx; 169 170 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 171 if (!tid_tx || !tid_tx->bar_pending) 172 return; 173 174 tid_tx->bar_pending = false; 175 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 176 } 177 178 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 179 { 180 struct ieee80211_mgmt *mgmt = (void *) skb->data; 181 struct ieee80211_local *local = sta->local; 182 struct ieee80211_sub_if_data *sdata = sta->sdata; 183 184 if (ieee80211_is_data_qos(mgmt->frame_control)) { 185 struct ieee80211_hdr *hdr = (void *) skb->data; 186 u8 *qc = ieee80211_get_qos_ctl(hdr); 187 u16 tid = qc[0] & 0xf; 188 189 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 190 } 191 192 if (ieee80211_is_action(mgmt->frame_control) && 193 sdata->vif.type == NL80211_IFTYPE_STATION && 194 mgmt->u.action.category == WLAN_CATEGORY_HT && 195 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) { 196 /* 197 * This update looks racy, but isn't -- if we come 198 * here we've definitely got a station that we're 199 * talking to, and on a managed interface that can 200 * only be the AP. And the only other place updating 201 * this variable is before we're associated. 202 */ 203 switch (mgmt->u.action.u.ht_smps.smps_control) { 204 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 205 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC; 206 break; 207 case WLAN_HT_SMPS_CONTROL_STATIC: 208 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC; 209 break; 210 case WLAN_HT_SMPS_CONTROL_DISABLED: 211 default: /* shouldn't happen since we don't send that */ 212 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF; 213 break; 214 } 215 216 ieee80211_queue_work(&local->hw, &local->recalc_smps); 217 } 218 } 219 220 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 221 { 222 struct tid_ampdu_tx *tid_tx; 223 224 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 225 if (!tid_tx) 226 return; 227 228 tid_tx->failed_bar_ssn = ssn; 229 tid_tx->bar_pending = true; 230 } 231 232 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 233 { 234 int len = sizeof(struct ieee80211_radiotap_header); 235 236 /* IEEE80211_RADIOTAP_RATE rate */ 237 if (info->status.rates[0].idx >= 0 && 238 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 239 len += 2; 240 241 /* IEEE80211_RADIOTAP_TX_FLAGS */ 242 len += 2; 243 244 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 245 len += 1; 246 247 /* IEEE80211_TX_RC_MCS */ 248 if (info->status.rates[0].idx >= 0 && 249 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 250 len += 3; 251 252 return len; 253 } 254 255 static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band 256 *sband, struct sk_buff *skb, 257 int retry_count, int rtap_len) 258 { 259 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 261 struct ieee80211_radiotap_header *rthdr; 262 unsigned char *pos; 263 u16 txflags; 264 265 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 266 267 memset(rthdr, 0, rtap_len); 268 rthdr->it_len = cpu_to_le16(rtap_len); 269 rthdr->it_present = 270 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 271 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 272 pos = (unsigned char *)(rthdr + 1); 273 274 /* 275 * XXX: Once radiotap gets the bitmap reset thing the vendor 276 * extensions proposal contains, we can actually report 277 * the whole set of tries we did. 278 */ 279 280 /* IEEE80211_RADIOTAP_RATE */ 281 if (info->status.rates[0].idx >= 0 && 282 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) { 283 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 284 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5; 285 /* padding for tx flags */ 286 pos += 2; 287 } 288 289 /* IEEE80211_RADIOTAP_TX_FLAGS */ 290 txflags = 0; 291 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 292 !is_multicast_ether_addr(hdr->addr1)) 293 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 294 295 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 296 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 297 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 298 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 299 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 300 301 put_unaligned_le16(txflags, pos); 302 pos += 2; 303 304 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 305 /* for now report the total retry_count */ 306 *pos = retry_count; 307 pos++; 308 309 /* IEEE80211_TX_RC_MCS */ 310 if (info->status.rates[0].idx >= 0 && 311 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 312 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 313 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 314 IEEE80211_RADIOTAP_MCS_HAVE_GI | 315 IEEE80211_RADIOTAP_MCS_HAVE_BW; 316 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 317 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 318 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 319 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 320 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 321 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 322 pos[2] = info->status.rates[0].idx; 323 pos += 3; 324 } 325 326 } 327 328 /* 329 * Use a static threshold for now, best value to be determined 330 * by testing ... 331 * Should it depend on: 332 * - on # of retransmissions 333 * - current throughput (higher value for higher tpt)? 334 */ 335 #define STA_LOST_PKT_THRESHOLD 50 336 337 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 338 { 339 struct sk_buff *skb2; 340 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 341 struct ieee80211_local *local = hw_to_local(hw); 342 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 343 __le16 fc; 344 struct ieee80211_supported_band *sband; 345 struct ieee80211_sub_if_data *sdata; 346 struct net_device *prev_dev = NULL; 347 struct sta_info *sta, *tmp; 348 int retry_count = -1, i; 349 int rates_idx = -1; 350 bool send_to_cooked; 351 bool acked; 352 struct ieee80211_bar *bar; 353 u16 tid; 354 int rtap_len; 355 356 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 357 if (info->status.rates[i].idx < 0) { 358 break; 359 } else if (i >= hw->max_report_rates) { 360 /* the HW cannot have attempted that rate */ 361 info->status.rates[i].idx = -1; 362 info->status.rates[i].count = 0; 363 break; 364 } 365 366 retry_count += info->status.rates[i].count; 367 } 368 rates_idx = i - 1; 369 370 if (retry_count < 0) 371 retry_count = 0; 372 373 rcu_read_lock(); 374 375 sband = local->hw.wiphy->bands[info->band]; 376 fc = hdr->frame_control; 377 378 for_each_sta_info(local, hdr->addr1, sta, tmp) { 379 /* skip wrong virtual interface */ 380 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN)) 381 continue; 382 383 if (info->flags & IEEE80211_TX_STATUS_EOSP) 384 clear_sta_flag(sta, WLAN_STA_SP); 385 386 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 387 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 388 /* 389 * The STA is in power save mode, so assume 390 * that this TX packet failed because of that. 391 */ 392 ieee80211_handle_filtered_frame(local, sta, skb); 393 rcu_read_unlock(); 394 return; 395 } 396 397 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 398 (rates_idx != -1)) 399 sta->last_tx_rate = info->status.rates[rates_idx]; 400 401 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 402 (ieee80211_is_data_qos(fc))) { 403 u16 tid, ssn; 404 u8 *qc; 405 406 qc = ieee80211_get_qos_ctl(hdr); 407 tid = qc[0] & 0xf; 408 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 409 & IEEE80211_SCTL_SEQ); 410 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 411 tid, ssn); 412 } 413 414 if (!acked && ieee80211_is_back_req(fc)) { 415 u16 control; 416 417 /* 418 * BAR failed, store the last SSN and retry sending 419 * the BAR when the next unicast transmission on the 420 * same TID succeeds. 421 */ 422 bar = (struct ieee80211_bar *) skb->data; 423 control = le16_to_cpu(bar->control); 424 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 425 u16 ssn = le16_to_cpu(bar->start_seq_num); 426 427 tid = (control & 428 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 429 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 430 431 ieee80211_set_bar_pending(sta, tid, ssn); 432 } 433 } 434 435 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 436 ieee80211_handle_filtered_frame(local, sta, skb); 437 rcu_read_unlock(); 438 return; 439 } else { 440 if (!acked) 441 sta->tx_retry_failed++; 442 sta->tx_retry_count += retry_count; 443 } 444 445 rate_control_tx_status(local, sband, sta, skb); 446 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 447 ieee80211s_update_metric(local, sta, skb); 448 449 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 450 ieee80211_frame_acked(sta, skb); 451 452 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 453 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 454 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked); 455 456 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 457 if (info->flags & IEEE80211_TX_STAT_ACK) { 458 if (sta->lost_packets) 459 sta->lost_packets = 0; 460 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) { 461 cfg80211_cqm_pktloss_notify(sta->sdata->dev, 462 sta->sta.addr, 463 sta->lost_packets, 464 GFP_ATOMIC); 465 sta->lost_packets = 0; 466 } 467 } 468 } 469 470 rcu_read_unlock(); 471 472 ieee80211_led_tx(local, 0); 473 474 /* SNMP counters 475 * Fragments are passed to low-level drivers as separate skbs, so these 476 * are actually fragments, not frames. Update frame counters only for 477 * the first fragment of the frame. */ 478 if (info->flags & IEEE80211_TX_STAT_ACK) { 479 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 480 local->dot11TransmittedFrameCount++; 481 if (is_multicast_ether_addr(hdr->addr1)) 482 local->dot11MulticastTransmittedFrameCount++; 483 if (retry_count > 0) 484 local->dot11RetryCount++; 485 if (retry_count > 1) 486 local->dot11MultipleRetryCount++; 487 } 488 489 /* This counter shall be incremented for an acknowledged MPDU 490 * with an individual address in the address 1 field or an MPDU 491 * with a multicast address in the address 1 field of type Data 492 * or Management. */ 493 if (!is_multicast_ether_addr(hdr->addr1) || 494 ieee80211_is_data(fc) || 495 ieee80211_is_mgmt(fc)) 496 local->dot11TransmittedFragmentCount++; 497 } else { 498 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 499 local->dot11FailedCount++; 500 } 501 502 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 503 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 504 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 505 local->ps_sdata && !(local->scanning)) { 506 if (info->flags & IEEE80211_TX_STAT_ACK) { 507 local->ps_sdata->u.mgd.flags |= 508 IEEE80211_STA_NULLFUNC_ACKED; 509 } else 510 mod_timer(&local->dynamic_ps_timer, jiffies + 511 msecs_to_jiffies(10)); 512 } 513 514 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) { 515 u64 cookie = (unsigned long)skb; 516 517 if (ieee80211_is_nullfunc(hdr->frame_control) || 518 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 519 bool acked = info->flags & IEEE80211_TX_STAT_ACK; 520 cfg80211_probe_status(skb->dev, hdr->addr1, 521 cookie, acked, GFP_ATOMIC); 522 } else { 523 struct ieee80211_work *wk; 524 525 rcu_read_lock(); 526 list_for_each_entry_rcu(wk, &local->work_list, list) { 527 if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX) 528 continue; 529 if (wk->offchan_tx.frame != skb) 530 continue; 531 wk->offchan_tx.status = true; 532 break; 533 } 534 rcu_read_unlock(); 535 if (local->hw_roc_skb_for_status == skb) { 536 cookie = local->hw_roc_cookie ^ 2; 537 local->hw_roc_skb_for_status = NULL; 538 } 539 540 cfg80211_mgmt_tx_status( 541 skb->dev, cookie, skb->data, skb->len, 542 !!(info->flags & IEEE80211_TX_STAT_ACK), 543 GFP_ATOMIC); 544 } 545 } 546 547 if (unlikely(info->ack_frame_id)) { 548 struct sk_buff *ack_skb; 549 unsigned long flags; 550 551 spin_lock_irqsave(&local->ack_status_lock, flags); 552 ack_skb = idr_find(&local->ack_status_frames, 553 info->ack_frame_id); 554 if (ack_skb) 555 idr_remove(&local->ack_status_frames, 556 info->ack_frame_id); 557 spin_unlock_irqrestore(&local->ack_status_lock, flags); 558 559 /* consumes ack_skb */ 560 if (ack_skb) 561 skb_complete_wifi_ack(ack_skb, 562 info->flags & IEEE80211_TX_STAT_ACK); 563 } 564 565 /* this was a transmitted frame, but now we want to reuse it */ 566 skb_orphan(skb); 567 568 /* Need to make a copy before skb->cb gets cleared */ 569 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 570 !(ieee80211_is_data(fc)); 571 572 /* 573 * This is a bit racy but we can avoid a lot of work 574 * with this test... 575 */ 576 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 577 dev_kfree_skb(skb); 578 return; 579 } 580 581 /* send frame to monitor interfaces now */ 582 rtap_len = ieee80211_tx_radiotap_len(info); 583 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 584 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 585 dev_kfree_skb(skb); 586 return; 587 } 588 ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len); 589 590 /* XXX: is this sufficient for BPF? */ 591 skb_set_mac_header(skb, 0); 592 skb->ip_summed = CHECKSUM_UNNECESSARY; 593 skb->pkt_type = PACKET_OTHERHOST; 594 skb->protocol = htons(ETH_P_802_2); 595 memset(skb->cb, 0, sizeof(skb->cb)); 596 597 rcu_read_lock(); 598 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 599 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 600 if (!ieee80211_sdata_running(sdata)) 601 continue; 602 603 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 604 !send_to_cooked) 605 continue; 606 607 if (prev_dev) { 608 skb2 = skb_clone(skb, GFP_ATOMIC); 609 if (skb2) { 610 skb2->dev = prev_dev; 611 netif_rx(skb2); 612 } 613 } 614 615 prev_dev = sdata->dev; 616 } 617 } 618 if (prev_dev) { 619 skb->dev = prev_dev; 620 netif_rx(skb); 621 skb = NULL; 622 } 623 rcu_read_unlock(); 624 dev_kfree_skb(skb); 625 } 626 EXPORT_SYMBOL(ieee80211_tx_status); 627 628 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 629 { 630 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 631 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 632 num_packets, GFP_ATOMIC); 633 } 634 EXPORT_SYMBOL(ieee80211_report_low_ack); 635 636 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 637 { 638 struct ieee80211_local *local = hw_to_local(hw); 639 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 640 641 if (unlikely(info->ack_frame_id)) { 642 struct sk_buff *ack_skb; 643 unsigned long flags; 644 645 spin_lock_irqsave(&local->ack_status_lock, flags); 646 ack_skb = idr_find(&local->ack_status_frames, 647 info->ack_frame_id); 648 if (ack_skb) 649 idr_remove(&local->ack_status_frames, 650 info->ack_frame_id); 651 spin_unlock_irqrestore(&local->ack_status_lock, flags); 652 653 /* consumes ack_skb */ 654 if (ack_skb) 655 dev_kfree_skb_any(ack_skb); 656 } 657 658 dev_kfree_skb_any(skb); 659 } 660 EXPORT_SYMBOL(ieee80211_free_txskb); 661