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 dev_kfree_skb_irq(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 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 159 if (net_ratelimit()) 160 wiphy_debug(local->hw.wiphy, 161 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", 162 skb_queue_len(&sta->tx_filtered[ac]), 163 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); 164 #endif 165 dev_kfree_skb(skb); 166 } 167 168 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) 169 { 170 struct tid_ampdu_tx *tid_tx; 171 172 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 173 if (!tid_tx || !tid_tx->bar_pending) 174 return; 175 176 tid_tx->bar_pending = false; 177 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); 178 } 179 180 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) 181 { 182 struct ieee80211_mgmt *mgmt = (void *) skb->data; 183 struct ieee80211_local *local = sta->local; 184 struct ieee80211_sub_if_data *sdata = sta->sdata; 185 186 if (ieee80211_is_data_qos(mgmt->frame_control)) { 187 struct ieee80211_hdr *hdr = (void *) skb->data; 188 u8 *qc = ieee80211_get_qos_ctl(hdr); 189 u16 tid = qc[0] & 0xf; 190 191 ieee80211_check_pending_bar(sta, hdr->addr1, tid); 192 } 193 194 if (ieee80211_is_action(mgmt->frame_control) && 195 sdata->vif.type == NL80211_IFTYPE_STATION && 196 mgmt->u.action.category == WLAN_CATEGORY_HT && 197 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) { 198 /* 199 * This update looks racy, but isn't -- if we come 200 * here we've definitely got a station that we're 201 * talking to, and on a managed interface that can 202 * only be the AP. And the only other place updating 203 * this variable is before we're associated. 204 */ 205 switch (mgmt->u.action.u.ht_smps.smps_control) { 206 case WLAN_HT_SMPS_CONTROL_DYNAMIC: 207 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC; 208 break; 209 case WLAN_HT_SMPS_CONTROL_STATIC: 210 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC; 211 break; 212 case WLAN_HT_SMPS_CONTROL_DISABLED: 213 default: /* shouldn't happen since we don't send that */ 214 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF; 215 break; 216 } 217 218 ieee80211_queue_work(&local->hw, &local->recalc_smps); 219 } 220 } 221 222 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) 223 { 224 struct tid_ampdu_tx *tid_tx; 225 226 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 227 if (!tid_tx) 228 return; 229 230 tid_tx->failed_bar_ssn = ssn; 231 tid_tx->bar_pending = true; 232 } 233 234 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) 235 { 236 int len = sizeof(struct ieee80211_radiotap_header); 237 238 /* IEEE80211_RADIOTAP_RATE rate */ 239 if (info->status.rates[0].idx >= 0 && 240 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) 241 len += 2; 242 243 /* IEEE80211_RADIOTAP_TX_FLAGS */ 244 len += 2; 245 246 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 247 len += 1; 248 249 /* IEEE80211_TX_RC_MCS */ 250 if (info->status.rates[0].idx >= 0 && 251 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) 252 len += 3; 253 254 return len; 255 } 256 257 static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band 258 *sband, struct sk_buff *skb, 259 int retry_count, int rtap_len) 260 { 261 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 262 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 263 struct ieee80211_radiotap_header *rthdr; 264 unsigned char *pos; 265 u16 txflags; 266 267 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); 268 269 memset(rthdr, 0, rtap_len); 270 rthdr->it_len = cpu_to_le16(rtap_len); 271 rthdr->it_present = 272 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | 273 (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); 274 pos = (unsigned char *)(rthdr + 1); 275 276 /* 277 * XXX: Once radiotap gets the bitmap reset thing the vendor 278 * extensions proposal contains, we can actually report 279 * the whole set of tries we did. 280 */ 281 282 /* IEEE80211_RADIOTAP_RATE */ 283 if (info->status.rates[0].idx >= 0 && 284 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) { 285 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); 286 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5; 287 /* padding for tx flags */ 288 pos += 2; 289 } 290 291 /* IEEE80211_RADIOTAP_TX_FLAGS */ 292 txflags = 0; 293 if (!(info->flags & IEEE80211_TX_STAT_ACK) && 294 !is_multicast_ether_addr(hdr->addr1)) 295 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; 296 297 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) || 298 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) 299 txflags |= IEEE80211_RADIOTAP_F_TX_CTS; 300 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) 301 txflags |= IEEE80211_RADIOTAP_F_TX_RTS; 302 303 put_unaligned_le16(txflags, pos); 304 pos += 2; 305 306 /* IEEE80211_RADIOTAP_DATA_RETRIES */ 307 /* for now report the total retry_count */ 308 *pos = retry_count; 309 pos++; 310 311 /* IEEE80211_TX_RC_MCS */ 312 if (info->status.rates[0].idx >= 0 && 313 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { 314 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); 315 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | 316 IEEE80211_RADIOTAP_MCS_HAVE_GI | 317 IEEE80211_RADIOTAP_MCS_HAVE_BW; 318 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) 319 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; 320 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 321 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; 322 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) 323 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; 324 pos[2] = info->status.rates[0].idx; 325 pos += 3; 326 } 327 328 } 329 330 /* 331 * Use a static threshold for now, best value to be determined 332 * by testing ... 333 * Should it depend on: 334 * - on # of retransmissions 335 * - current throughput (higher value for higher tpt)? 336 */ 337 #define STA_LOST_PKT_THRESHOLD 50 338 339 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) 340 { 341 struct sk_buff *skb2; 342 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 343 struct ieee80211_local *local = hw_to_local(hw); 344 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 345 __le16 fc; 346 struct ieee80211_supported_band *sband; 347 struct ieee80211_sub_if_data *sdata; 348 struct net_device *prev_dev = NULL; 349 struct sta_info *sta, *tmp; 350 int retry_count = -1, i; 351 int rates_idx = -1; 352 bool send_to_cooked; 353 bool acked; 354 struct ieee80211_bar *bar; 355 int rtap_len; 356 357 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 358 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && 359 !(info->flags & IEEE80211_TX_STAT_AMPDU)) { 360 /* just the first aggr frame carry status info */ 361 info->status.rates[i].idx = -1; 362 info->status.rates[i].count = 0; 363 break; 364 } else if (info->status.rates[i].idx < 0) { 365 break; 366 } else if (i >= hw->max_report_rates) { 367 /* the HW cannot have attempted that rate */ 368 info->status.rates[i].idx = -1; 369 info->status.rates[i].count = 0; 370 break; 371 } 372 373 retry_count += info->status.rates[i].count; 374 } 375 rates_idx = i - 1; 376 377 if (retry_count < 0) 378 retry_count = 0; 379 380 rcu_read_lock(); 381 382 sband = local->hw.wiphy->bands[info->band]; 383 fc = hdr->frame_control; 384 385 for_each_sta_info(local, hdr->addr1, sta, tmp) { 386 /* skip wrong virtual interface */ 387 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) 388 continue; 389 390 if (info->flags & IEEE80211_TX_STATUS_EOSP) 391 clear_sta_flag(sta, WLAN_STA_SP); 392 393 acked = !!(info->flags & IEEE80211_TX_STAT_ACK); 394 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { 395 /* 396 * The STA is in power save mode, so assume 397 * that this TX packet failed because of that. 398 */ 399 ieee80211_handle_filtered_frame(local, sta, skb); 400 rcu_read_unlock(); 401 return; 402 } 403 404 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && 405 (rates_idx != -1)) 406 sta->last_tx_rate = info->status.rates[rates_idx]; 407 408 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && 409 (ieee80211_is_data_qos(fc))) { 410 u16 tid, ssn; 411 u8 *qc; 412 413 qc = ieee80211_get_qos_ctl(hdr); 414 tid = qc[0] & 0xf; 415 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) 416 & IEEE80211_SCTL_SEQ); 417 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, 418 tid, ssn); 419 } 420 421 if (!acked && ieee80211_is_back_req(fc)) { 422 u16 tid, control; 423 424 /* 425 * BAR failed, store the last SSN and retry sending 426 * the BAR when the next unicast transmission on the 427 * same TID succeeds. 428 */ 429 bar = (struct ieee80211_bar *) skb->data; 430 control = le16_to_cpu(bar->control); 431 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { 432 u16 ssn = le16_to_cpu(bar->start_seq_num); 433 434 tid = (control & 435 IEEE80211_BAR_CTRL_TID_INFO_MASK) >> 436 IEEE80211_BAR_CTRL_TID_INFO_SHIFT; 437 438 ieee80211_set_bar_pending(sta, tid, ssn); 439 } 440 } 441 442 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { 443 ieee80211_handle_filtered_frame(local, sta, skb); 444 rcu_read_unlock(); 445 return; 446 } else { 447 if (!acked) 448 sta->tx_retry_failed++; 449 sta->tx_retry_count += retry_count; 450 } 451 452 rate_control_tx_status(local, sband, sta, skb); 453 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) 454 ieee80211s_update_metric(local, sta, skb); 455 456 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) 457 ieee80211_frame_acked(sta, skb); 458 459 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && 460 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) 461 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked); 462 463 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { 464 if (info->flags & IEEE80211_TX_STAT_ACK) { 465 if (sta->lost_packets) 466 sta->lost_packets = 0; 467 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) { 468 cfg80211_cqm_pktloss_notify(sta->sdata->dev, 469 sta->sta.addr, 470 sta->lost_packets, 471 GFP_ATOMIC); 472 sta->lost_packets = 0; 473 } 474 } 475 } 476 477 rcu_read_unlock(); 478 479 ieee80211_led_tx(local, 0); 480 481 /* SNMP counters 482 * Fragments are passed to low-level drivers as separate skbs, so these 483 * are actually fragments, not frames. Update frame counters only for 484 * the first fragment of the frame. */ 485 if (info->flags & IEEE80211_TX_STAT_ACK) { 486 if (ieee80211_is_first_frag(hdr->seq_ctrl)) { 487 local->dot11TransmittedFrameCount++; 488 if (is_multicast_ether_addr(hdr->addr1)) 489 local->dot11MulticastTransmittedFrameCount++; 490 if (retry_count > 0) 491 local->dot11RetryCount++; 492 if (retry_count > 1) 493 local->dot11MultipleRetryCount++; 494 } 495 496 /* This counter shall be incremented for an acknowledged MPDU 497 * with an individual address in the address 1 field or an MPDU 498 * with a multicast address in the address 1 field of type Data 499 * or Management. */ 500 if (!is_multicast_ether_addr(hdr->addr1) || 501 ieee80211_is_data(fc) || 502 ieee80211_is_mgmt(fc)) 503 local->dot11TransmittedFragmentCount++; 504 } else { 505 if (ieee80211_is_first_frag(hdr->seq_ctrl)) 506 local->dot11FailedCount++; 507 } 508 509 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && 510 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && 511 !(info->flags & IEEE80211_TX_CTL_INJECTED) && 512 local->ps_sdata && !(local->scanning)) { 513 if (info->flags & IEEE80211_TX_STAT_ACK) { 514 local->ps_sdata->u.mgd.flags |= 515 IEEE80211_STA_NULLFUNC_ACKED; 516 } else 517 mod_timer(&local->dynamic_ps_timer, jiffies + 518 msecs_to_jiffies(10)); 519 } 520 521 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) { 522 u64 cookie = (unsigned long)skb; 523 524 if (ieee80211_is_nullfunc(hdr->frame_control) || 525 ieee80211_is_qos_nullfunc(hdr->frame_control)) { 526 acked = info->flags & IEEE80211_TX_STAT_ACK; 527 528 cfg80211_probe_status(skb->dev, hdr->addr1, 529 cookie, acked, GFP_ATOMIC); 530 } else { 531 struct ieee80211_work *wk; 532 533 rcu_read_lock(); 534 list_for_each_entry_rcu(wk, &local->work_list, list) { 535 if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX) 536 continue; 537 if (wk->offchan_tx.frame != skb) 538 continue; 539 wk->offchan_tx.status = true; 540 break; 541 } 542 rcu_read_unlock(); 543 if (local->hw_roc_skb_for_status == skb) { 544 cookie = local->hw_roc_cookie ^ 2; 545 local->hw_roc_skb_for_status = NULL; 546 } 547 548 cfg80211_mgmt_tx_status( 549 skb->dev, cookie, skb->data, skb->len, 550 !!(info->flags & IEEE80211_TX_STAT_ACK), 551 GFP_ATOMIC); 552 } 553 } 554 555 if (unlikely(info->ack_frame_id)) { 556 struct sk_buff *ack_skb; 557 unsigned long flags; 558 559 spin_lock_irqsave(&local->ack_status_lock, flags); 560 ack_skb = idr_find(&local->ack_status_frames, 561 info->ack_frame_id); 562 if (ack_skb) 563 idr_remove(&local->ack_status_frames, 564 info->ack_frame_id); 565 spin_unlock_irqrestore(&local->ack_status_lock, flags); 566 567 /* consumes ack_skb */ 568 if (ack_skb) 569 skb_complete_wifi_ack(ack_skb, 570 info->flags & IEEE80211_TX_STAT_ACK); 571 } 572 573 /* this was a transmitted frame, but now we want to reuse it */ 574 skb_orphan(skb); 575 576 /* Need to make a copy before skb->cb gets cleared */ 577 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || 578 !(ieee80211_is_data(fc)); 579 580 /* 581 * This is a bit racy but we can avoid a lot of work 582 * with this test... 583 */ 584 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { 585 dev_kfree_skb(skb); 586 return; 587 } 588 589 /* send frame to monitor interfaces now */ 590 rtap_len = ieee80211_tx_radiotap_len(info); 591 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { 592 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n"); 593 dev_kfree_skb(skb); 594 return; 595 } 596 ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len); 597 598 /* XXX: is this sufficient for BPF? */ 599 skb_set_mac_header(skb, 0); 600 skb->ip_summed = CHECKSUM_UNNECESSARY; 601 skb->pkt_type = PACKET_OTHERHOST; 602 skb->protocol = htons(ETH_P_802_2); 603 memset(skb->cb, 0, sizeof(skb->cb)); 604 605 rcu_read_lock(); 606 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 607 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { 608 if (!ieee80211_sdata_running(sdata)) 609 continue; 610 611 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && 612 !send_to_cooked) 613 continue; 614 615 if (prev_dev) { 616 skb2 = skb_clone(skb, GFP_ATOMIC); 617 if (skb2) { 618 skb2->dev = prev_dev; 619 netif_rx(skb2); 620 } 621 } 622 623 prev_dev = sdata->dev; 624 } 625 } 626 if (prev_dev) { 627 skb->dev = prev_dev; 628 netif_rx(skb); 629 skb = NULL; 630 } 631 rcu_read_unlock(); 632 dev_kfree_skb(skb); 633 } 634 EXPORT_SYMBOL(ieee80211_tx_status); 635 636 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) 637 { 638 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 639 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, 640 num_packets, GFP_ATOMIC); 641 } 642 EXPORT_SYMBOL(ieee80211_report_low_ack); 643 644 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) 645 { 646 struct ieee80211_local *local = hw_to_local(hw); 647 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 648 649 if (unlikely(info->ack_frame_id)) { 650 struct sk_buff *ack_skb; 651 unsigned long flags; 652 653 spin_lock_irqsave(&local->ack_status_lock, flags); 654 ack_skb = idr_find(&local->ack_status_frames, 655 info->ack_frame_id); 656 if (ack_skb) 657 idr_remove(&local->ack_status_frames, 658 info->ack_frame_id); 659 spin_unlock_irqrestore(&local->ack_status_lock, flags); 660 661 /* consumes ack_skb */ 662 if (ack_skb) 663 dev_kfree_skb_any(ack_skb); 664 } 665 666 dev_kfree_skb_any(skb); 667 } 668 EXPORT_SYMBOL(ieee80211_free_txskb); 669