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 2007 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 * Transmit and frame generation functions. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/skbuff.h> 18 #include <linux/etherdevice.h> 19 #include <linux/bitmap.h> 20 #include <linux/rcupdate.h> 21 #include <linux/export.h> 22 #include <linux/time.h> 23 #include <net/net_namespace.h> 24 #include <net/ieee80211_radiotap.h> 25 #include <net/cfg80211.h> 26 #include <net/mac80211.h> 27 #include <asm/unaligned.h> 28 29 #include "ieee80211_i.h" 30 #include "driver-ops.h" 31 #include "led.h" 32 #include "mesh.h" 33 #include "wep.h" 34 #include "wpa.h" 35 #include "wme.h" 36 #include "rate.h" 37 38 /* misc utils */ 39 40 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 41 struct sk_buff *skb, int group_addr, 42 int next_frag_len) 43 { 44 int rate, mrate, erp, dur, i, shift = 0; 45 struct ieee80211_rate *txrate; 46 struct ieee80211_local *local = tx->local; 47 struct ieee80211_supported_band *sband; 48 struct ieee80211_hdr *hdr; 49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 50 struct ieee80211_chanctx_conf *chanctx_conf; 51 u32 rate_flags = 0; 52 53 rcu_read_lock(); 54 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 55 if (chanctx_conf) { 56 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 57 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 58 } 59 rcu_read_unlock(); 60 61 /* assume HW handles this */ 62 if (tx->rate.flags & IEEE80211_TX_RC_MCS) 63 return 0; 64 65 /* uh huh? */ 66 if (WARN_ON_ONCE(tx->rate.idx < 0)) 67 return 0; 68 69 sband = local->hw.wiphy->bands[info->band]; 70 txrate = &sband->bitrates[tx->rate.idx]; 71 72 erp = txrate->flags & IEEE80211_RATE_ERP_G; 73 74 /* 75 * data and mgmt (except PS Poll): 76 * - during CFP: 32768 77 * - during contention period: 78 * if addr1 is group address: 0 79 * if more fragments = 0 and addr1 is individual address: time to 80 * transmit one ACK plus SIFS 81 * if more fragments = 1 and addr1 is individual address: time to 82 * transmit next fragment plus 2 x ACK plus 3 x SIFS 83 * 84 * IEEE 802.11, 9.6: 85 * - control response frame (CTS or ACK) shall be transmitted using the 86 * same rate as the immediately previous frame in the frame exchange 87 * sequence, if this rate belongs to the PHY mandatory rates, or else 88 * at the highest possible rate belonging to the PHY rates in the 89 * BSSBasicRateSet 90 */ 91 hdr = (struct ieee80211_hdr *)skb->data; 92 if (ieee80211_is_ctl(hdr->frame_control)) { 93 /* TODO: These control frames are not currently sent by 94 * mac80211, but should they be implemented, this function 95 * needs to be updated to support duration field calculation. 96 * 97 * RTS: time needed to transmit pending data/mgmt frame plus 98 * one CTS frame plus one ACK frame plus 3 x SIFS 99 * CTS: duration of immediately previous RTS minus time 100 * required to transmit CTS and its SIFS 101 * ACK: 0 if immediately previous directed data/mgmt had 102 * more=0, with more=1 duration in ACK frame is duration 103 * from previous frame minus time needed to transmit ACK 104 * and its SIFS 105 * PS Poll: BIT(15) | BIT(14) | aid 106 */ 107 return 0; 108 } 109 110 /* data/mgmt */ 111 if (0 /* FIX: data/mgmt during CFP */) 112 return cpu_to_le16(32768); 113 114 if (group_addr) /* Group address as the destination - no ACK */ 115 return 0; 116 117 /* Individual destination address: 118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 119 * CTS and ACK frames shall be transmitted using the highest rate in 120 * basic rate set that is less than or equal to the rate of the 121 * immediately previous frame and that is using the same modulation 122 * (CCK or OFDM). If no basic rate set matches with these requirements, 123 * the highest mandatory rate of the PHY that is less than or equal to 124 * the rate of the previous frame is used. 125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 126 */ 127 rate = -1; 128 /* use lowest available if everything fails */ 129 mrate = sband->bitrates[0].bitrate; 130 for (i = 0; i < sband->n_bitrates; i++) { 131 struct ieee80211_rate *r = &sband->bitrates[i]; 132 133 if (r->bitrate > txrate->bitrate) 134 break; 135 136 if ((rate_flags & r->flags) != rate_flags) 137 continue; 138 139 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 140 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 141 142 switch (sband->band) { 143 case IEEE80211_BAND_2GHZ: { 144 u32 flag; 145 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 146 flag = IEEE80211_RATE_MANDATORY_G; 147 else 148 flag = IEEE80211_RATE_MANDATORY_B; 149 if (r->flags & flag) 150 mrate = r->bitrate; 151 break; 152 } 153 case IEEE80211_BAND_5GHZ: 154 if (r->flags & IEEE80211_RATE_MANDATORY_A) 155 mrate = r->bitrate; 156 break; 157 case IEEE80211_BAND_60GHZ: 158 /* TODO, for now fall through */ 159 case IEEE80211_NUM_BANDS: 160 WARN_ON(1); 161 break; 162 } 163 } 164 if (rate == -1) { 165 /* No matching basic rate found; use highest suitable mandatory 166 * PHY rate */ 167 rate = DIV_ROUND_UP(mrate, 1 << shift); 168 } 169 170 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 171 if (ieee80211_is_data_qos(hdr->frame_control) && 172 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 173 dur = 0; 174 else 175 /* Time needed to transmit ACK 176 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 177 * to closest integer */ 178 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 179 tx->sdata->vif.bss_conf.use_short_preamble, 180 shift); 181 182 if (next_frag_len) { 183 /* Frame is fragmented: duration increases with time needed to 184 * transmit next fragment plus ACK and 2 x SIFS. */ 185 dur *= 2; /* ACK + SIFS */ 186 /* next fragment */ 187 dur += ieee80211_frame_duration(sband->band, next_frag_len, 188 txrate->bitrate, erp, 189 tx->sdata->vif.bss_conf.use_short_preamble, 190 shift); 191 } 192 193 return cpu_to_le16(dur); 194 } 195 196 /* tx handlers */ 197 static ieee80211_tx_result debug_noinline 198 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 199 { 200 struct ieee80211_local *local = tx->local; 201 struct ieee80211_if_managed *ifmgd; 202 203 /* driver doesn't support power save */ 204 if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) 205 return TX_CONTINUE; 206 207 /* hardware does dynamic power save */ 208 if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) 209 return TX_CONTINUE; 210 211 /* dynamic power save disabled */ 212 if (local->hw.conf.dynamic_ps_timeout <= 0) 213 return TX_CONTINUE; 214 215 /* we are scanning, don't enable power save */ 216 if (local->scanning) 217 return TX_CONTINUE; 218 219 if (!local->ps_sdata) 220 return TX_CONTINUE; 221 222 /* No point if we're going to suspend */ 223 if (local->quiescing) 224 return TX_CONTINUE; 225 226 /* dynamic ps is supported only in managed mode */ 227 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 228 return TX_CONTINUE; 229 230 ifmgd = &tx->sdata->u.mgd; 231 232 /* 233 * Don't wakeup from power save if u-apsd is enabled, voip ac has 234 * u-apsd enabled and the frame is in voip class. This effectively 235 * means that even if all access categories have u-apsd enabled, in 236 * practise u-apsd is only used with the voip ac. This is a 237 * workaround for the case when received voip class packets do not 238 * have correct qos tag for some reason, due the network or the 239 * peer application. 240 * 241 * Note: ifmgd->uapsd_queues access is racy here. If the value is 242 * changed via debugfs, user needs to reassociate manually to have 243 * everything in sync. 244 */ 245 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 246 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 247 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 248 return TX_CONTINUE; 249 250 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 251 ieee80211_stop_queues_by_reason(&local->hw, 252 IEEE80211_MAX_QUEUE_MAP, 253 IEEE80211_QUEUE_STOP_REASON_PS, 254 false); 255 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 256 ieee80211_queue_work(&local->hw, 257 &local->dynamic_ps_disable_work); 258 } 259 260 /* Don't restart the timer if we're not disassociated */ 261 if (!ifmgd->associated) 262 return TX_CONTINUE; 263 264 mod_timer(&local->dynamic_ps_timer, jiffies + 265 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 266 267 return TX_CONTINUE; 268 } 269 270 static ieee80211_tx_result debug_noinline 271 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 272 { 273 274 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 275 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 276 bool assoc = false; 277 278 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 279 return TX_CONTINUE; 280 281 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 282 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 283 !ieee80211_is_probe_req(hdr->frame_control) && 284 !ieee80211_is_nullfunc(hdr->frame_control)) 285 /* 286 * When software scanning only nullfunc frames (to notify 287 * the sleep state to the AP) and probe requests (for the 288 * active scan) are allowed, all other frames should not be 289 * sent and we should not get here, but if we do 290 * nonetheless, drop them to avoid sending them 291 * off-channel. See the link below and 292 * ieee80211_start_scan() for more. 293 * 294 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 295 */ 296 return TX_DROP; 297 298 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 299 return TX_CONTINUE; 300 301 if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 302 return TX_CONTINUE; 303 304 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 305 return TX_CONTINUE; 306 307 if (tx->sta) 308 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 309 310 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 311 if (unlikely(!assoc && 312 ieee80211_is_data(hdr->frame_control))) { 313 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 314 sdata_info(tx->sdata, 315 "dropped data frame to not associated station %pM\n", 316 hdr->addr1); 317 #endif 318 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 319 return TX_DROP; 320 } 321 } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && 322 ieee80211_is_data(hdr->frame_control) && 323 !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { 324 /* 325 * No associated STAs - no need to send multicast 326 * frames. 327 */ 328 return TX_DROP; 329 } 330 331 return TX_CONTINUE; 332 } 333 334 /* This function is called whenever the AP is about to exceed the maximum limit 335 * of buffered frames for power saving STAs. This situation should not really 336 * happen often during normal operation, so dropping the oldest buffered packet 337 * from each queue should be OK to make some room for new frames. */ 338 static void purge_old_ps_buffers(struct ieee80211_local *local) 339 { 340 int total = 0, purged = 0; 341 struct sk_buff *skb; 342 struct ieee80211_sub_if_data *sdata; 343 struct sta_info *sta; 344 345 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 346 struct ps_data *ps; 347 348 if (sdata->vif.type == NL80211_IFTYPE_AP) 349 ps = &sdata->u.ap.ps; 350 else if (ieee80211_vif_is_mesh(&sdata->vif)) 351 ps = &sdata->u.mesh.ps; 352 else 353 continue; 354 355 skb = skb_dequeue(&ps->bc_buf); 356 if (skb) { 357 purged++; 358 dev_kfree_skb(skb); 359 } 360 total += skb_queue_len(&ps->bc_buf); 361 } 362 363 /* 364 * Drop one frame from each station from the lowest-priority 365 * AC that has frames at all. 366 */ 367 list_for_each_entry_rcu(sta, &local->sta_list, list) { 368 int ac; 369 370 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 371 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 372 total += skb_queue_len(&sta->ps_tx_buf[ac]); 373 if (skb) { 374 purged++; 375 ieee80211_free_txskb(&local->hw, skb); 376 break; 377 } 378 } 379 } 380 381 local->total_ps_buffered = total; 382 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 383 } 384 385 static ieee80211_tx_result 386 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 387 { 388 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 389 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 390 struct ps_data *ps; 391 392 /* 393 * broadcast/multicast frame 394 * 395 * If any of the associated/peer stations is in power save mode, 396 * the frame is buffered to be sent after DTIM beacon frame. 397 * This is done either by the hardware or us. 398 */ 399 400 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 401 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 402 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 403 if (!tx->sdata->bss) 404 return TX_CONTINUE; 405 406 ps = &tx->sdata->bss->ps; 407 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 408 ps = &tx->sdata->u.mesh.ps; 409 } else { 410 return TX_CONTINUE; 411 } 412 413 414 /* no buffering for ordered frames */ 415 if (ieee80211_has_order(hdr->frame_control)) 416 return TX_CONTINUE; 417 418 if (ieee80211_is_probe_req(hdr->frame_control)) 419 return TX_CONTINUE; 420 421 if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) 422 info->hw_queue = tx->sdata->vif.cab_queue; 423 424 /* no stations in PS mode */ 425 if (!atomic_read(&ps->num_sta_ps)) 426 return TX_CONTINUE; 427 428 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 429 430 /* device releases frame after DTIM beacon */ 431 if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) 432 return TX_CONTINUE; 433 434 /* buffered in mac80211 */ 435 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 436 purge_old_ps_buffers(tx->local); 437 438 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 439 ps_dbg(tx->sdata, 440 "BC TX buffer full - dropping the oldest frame\n"); 441 dev_kfree_skb(skb_dequeue(&ps->bc_buf)); 442 } else 443 tx->local->total_ps_buffered++; 444 445 skb_queue_tail(&ps->bc_buf, tx->skb); 446 447 return TX_QUEUED; 448 } 449 450 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 451 struct sk_buff *skb) 452 { 453 if (!ieee80211_is_mgmt(fc)) 454 return 0; 455 456 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 457 return 0; 458 459 if (!ieee80211_is_robust_mgmt_frame(skb)) 460 return 0; 461 462 return 1; 463 } 464 465 static ieee80211_tx_result 466 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 467 { 468 struct sta_info *sta = tx->sta; 469 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 470 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 471 struct ieee80211_local *local = tx->local; 472 473 if (unlikely(!sta)) 474 return TX_CONTINUE; 475 476 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 477 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 478 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 479 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 480 int ac = skb_get_queue_mapping(tx->skb); 481 482 if (ieee80211_is_mgmt(hdr->frame_control) && 483 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 484 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 485 return TX_CONTINUE; 486 } 487 488 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 489 sta->sta.addr, sta->sta.aid, ac); 490 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 491 purge_old_ps_buffers(tx->local); 492 493 /* sync with ieee80211_sta_ps_deliver_wakeup */ 494 spin_lock(&sta->ps_lock); 495 /* 496 * STA woke up the meantime and all the frames on ps_tx_buf have 497 * been queued to pending queue. No reordering can happen, go 498 * ahead and Tx the packet. 499 */ 500 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 501 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 502 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 503 spin_unlock(&sta->ps_lock); 504 return TX_CONTINUE; 505 } 506 507 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 508 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 509 ps_dbg(tx->sdata, 510 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 511 sta->sta.addr, ac); 512 ieee80211_free_txskb(&local->hw, old); 513 } else 514 tx->local->total_ps_buffered++; 515 516 info->control.jiffies = jiffies; 517 info->control.vif = &tx->sdata->vif; 518 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 519 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 520 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 521 spin_unlock(&sta->ps_lock); 522 523 if (!timer_pending(&local->sta_cleanup)) 524 mod_timer(&local->sta_cleanup, 525 round_jiffies(jiffies + 526 STA_INFO_CLEANUP_INTERVAL)); 527 528 /* 529 * We queued up some frames, so the TIM bit might 530 * need to be set, recalculate it. 531 */ 532 sta_info_recalc_tim(sta); 533 534 return TX_QUEUED; 535 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 536 ps_dbg(tx->sdata, 537 "STA %pM in PS mode, but polling/in SP -> send frame\n", 538 sta->sta.addr); 539 } 540 541 return TX_CONTINUE; 542 } 543 544 static ieee80211_tx_result debug_noinline 545 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 546 { 547 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 548 return TX_CONTINUE; 549 550 if (tx->flags & IEEE80211_TX_UNICAST) 551 return ieee80211_tx_h_unicast_ps_buf(tx); 552 else 553 return ieee80211_tx_h_multicast_ps_buf(tx); 554 } 555 556 static ieee80211_tx_result debug_noinline 557 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 558 { 559 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 560 561 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 562 if (tx->sdata->control_port_no_encrypt) 563 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 564 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 565 } 566 567 return TX_CONTINUE; 568 } 569 570 static ieee80211_tx_result debug_noinline 571 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 572 { 573 struct ieee80211_key *key; 574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 575 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 576 577 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 578 tx->key = NULL; 579 else if (tx->sta && 580 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 581 tx->key = key; 582 else if (ieee80211_is_mgmt(hdr->frame_control) && 583 is_multicast_ether_addr(hdr->addr1) && 584 ieee80211_is_robust_mgmt_frame(tx->skb) && 585 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 586 tx->key = key; 587 else if (is_multicast_ether_addr(hdr->addr1) && 588 (key = rcu_dereference(tx->sdata->default_multicast_key))) 589 tx->key = key; 590 else if (!is_multicast_ether_addr(hdr->addr1) && 591 (key = rcu_dereference(tx->sdata->default_unicast_key))) 592 tx->key = key; 593 else if (info->flags & IEEE80211_TX_CTL_INJECTED) 594 tx->key = NULL; 595 else if (!tx->sdata->drop_unencrypted) 596 tx->key = NULL; 597 else if (tx->skb->protocol == tx->sdata->control_port_protocol) 598 tx->key = NULL; 599 else if (ieee80211_is_robust_mgmt_frame(tx->skb) && 600 !(ieee80211_is_action(hdr->frame_control) && 601 tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) 602 tx->key = NULL; 603 else if (ieee80211_is_mgmt(hdr->frame_control) && 604 !ieee80211_is_robust_mgmt_frame(tx->skb)) 605 tx->key = NULL; 606 else { 607 I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); 608 return TX_DROP; 609 } 610 611 if (tx->key) { 612 bool skip_hw = false; 613 614 tx->key->tx_rx_count++; 615 /* TODO: add threshold stuff again */ 616 617 switch (tx->key->conf.cipher) { 618 case WLAN_CIPHER_SUITE_WEP40: 619 case WLAN_CIPHER_SUITE_WEP104: 620 case WLAN_CIPHER_SUITE_TKIP: 621 if (!ieee80211_is_data_present(hdr->frame_control)) 622 tx->key = NULL; 623 break; 624 case WLAN_CIPHER_SUITE_CCMP: 625 if (!ieee80211_is_data_present(hdr->frame_control) && 626 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 627 tx->skb)) 628 tx->key = NULL; 629 else 630 skip_hw = (tx->key->conf.flags & 631 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 632 ieee80211_is_mgmt(hdr->frame_control); 633 break; 634 case WLAN_CIPHER_SUITE_AES_CMAC: 635 if (!ieee80211_is_mgmt(hdr->frame_control)) 636 tx->key = NULL; 637 break; 638 } 639 640 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 641 !ieee80211_is_deauth(hdr->frame_control))) 642 return TX_DROP; 643 644 if (!skip_hw && tx->key && 645 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 646 info->control.hw_key = &tx->key->conf; 647 } 648 649 return TX_CONTINUE; 650 } 651 652 static ieee80211_tx_result debug_noinline 653 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 654 { 655 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 656 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 657 struct ieee80211_supported_band *sband; 658 u32 len; 659 struct ieee80211_tx_rate_control txrc; 660 struct ieee80211_sta_rates *ratetbl = NULL; 661 bool assoc = false; 662 663 memset(&txrc, 0, sizeof(txrc)); 664 665 sband = tx->local->hw.wiphy->bands[info->band]; 666 667 len = min_t(u32, tx->skb->len + FCS_LEN, 668 tx->local->hw.wiphy->frag_threshold); 669 670 /* set up the tx rate control struct we give the RC algo */ 671 txrc.hw = &tx->local->hw; 672 txrc.sband = sband; 673 txrc.bss_conf = &tx->sdata->vif.bss_conf; 674 txrc.skb = tx->skb; 675 txrc.reported_rate.idx = -1; 676 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 677 if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) 678 txrc.max_rate_idx = -1; 679 else 680 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 681 682 if (tx->sdata->rc_has_mcs_mask[info->band]) 683 txrc.rate_idx_mcs_mask = 684 tx->sdata->rc_rateidx_mcs_mask[info->band]; 685 686 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 687 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 688 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); 689 690 /* set up RTS protection if desired */ 691 if (len > tx->local->hw.wiphy->rts_threshold) { 692 txrc.rts = true; 693 } 694 695 info->control.use_rts = txrc.rts; 696 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 697 698 /* 699 * Use short preamble if the BSS can handle it, but not for 700 * management frames unless we know the receiver can handle 701 * that -- the management frame might be to a station that 702 * just wants a probe response. 703 */ 704 if (tx->sdata->vif.bss_conf.use_short_preamble && 705 (ieee80211_is_data(hdr->frame_control) || 706 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 707 txrc.short_preamble = true; 708 709 info->control.short_preamble = txrc.short_preamble; 710 711 if (tx->sta) 712 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 713 714 /* 715 * Lets not bother rate control if we're associated and cannot 716 * talk to the sta. This should not happen. 717 */ 718 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 719 !rate_usable_index_exists(sband, &tx->sta->sta), 720 "%s: Dropped data frame as no usable bitrate found while " 721 "scanning and associated. Target station: " 722 "%pM on %d GHz band\n", 723 tx->sdata->name, hdr->addr1, 724 info->band ? 5 : 2)) 725 return TX_DROP; 726 727 /* 728 * If we're associated with the sta at this point we know we can at 729 * least send the frame at the lowest bit rate. 730 */ 731 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 732 733 if (tx->sta && !info->control.skip_table) 734 ratetbl = rcu_dereference(tx->sta->sta.rates); 735 736 if (unlikely(info->control.rates[0].idx < 0)) { 737 if (ratetbl) { 738 struct ieee80211_tx_rate rate = { 739 .idx = ratetbl->rate[0].idx, 740 .flags = ratetbl->rate[0].flags, 741 .count = ratetbl->rate[0].count 742 }; 743 744 if (ratetbl->rate[0].idx < 0) 745 return TX_DROP; 746 747 tx->rate = rate; 748 } else { 749 return TX_DROP; 750 } 751 } else { 752 tx->rate = info->control.rates[0]; 753 } 754 755 if (txrc.reported_rate.idx < 0) { 756 txrc.reported_rate = tx->rate; 757 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 758 tx->sta->last_tx_rate = txrc.reported_rate; 759 } else if (tx->sta) 760 tx->sta->last_tx_rate = txrc.reported_rate; 761 762 if (ratetbl) 763 return TX_CONTINUE; 764 765 if (unlikely(!info->control.rates[0].count)) 766 info->control.rates[0].count = 1; 767 768 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 769 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 770 info->control.rates[0].count = 1; 771 772 return TX_CONTINUE; 773 } 774 775 static ieee80211_tx_result debug_noinline 776 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 777 { 778 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 779 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 780 u16 *seq; 781 u8 *qc; 782 int tid; 783 784 /* 785 * Packet injection may want to control the sequence 786 * number, if we have no matching interface then we 787 * neither assign one ourselves nor ask the driver to. 788 */ 789 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 790 return TX_CONTINUE; 791 792 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 793 return TX_CONTINUE; 794 795 if (ieee80211_hdrlen(hdr->frame_control) < 24) 796 return TX_CONTINUE; 797 798 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 799 return TX_CONTINUE; 800 801 /* 802 * Anything but QoS data that has a sequence number field 803 * (is long enough) gets a sequence number from the global 804 * counter. QoS data frames with a multicast destination 805 * also use the global counter (802.11-2012 9.3.2.10). 806 */ 807 if (!ieee80211_is_data_qos(hdr->frame_control) || 808 is_multicast_ether_addr(hdr->addr1)) { 809 /* driver should assign sequence number */ 810 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 811 /* for pure STA mode without beacons, we can do it */ 812 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 813 tx->sdata->sequence_number += 0x10; 814 return TX_CONTINUE; 815 } 816 817 /* 818 * This should be true for injected/management frames only, for 819 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 820 * above since they are not QoS-data frames. 821 */ 822 if (!tx->sta) 823 return TX_CONTINUE; 824 825 /* include per-STA, per-TID sequence counter */ 826 827 qc = ieee80211_get_qos_ctl(hdr); 828 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 829 seq = &tx->sta->tid_seq[tid]; 830 831 hdr->seq_ctrl = cpu_to_le16(*seq); 832 833 /* Increase the sequence number. */ 834 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 835 836 return TX_CONTINUE; 837 } 838 839 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 840 struct sk_buff *skb, int hdrlen, 841 int frag_threshold) 842 { 843 struct ieee80211_local *local = tx->local; 844 struct ieee80211_tx_info *info; 845 struct sk_buff *tmp; 846 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 847 int pos = hdrlen + per_fragm; 848 int rem = skb->len - hdrlen - per_fragm; 849 850 if (WARN_ON(rem < 0)) 851 return -EINVAL; 852 853 /* first fragment was already added to queue by caller */ 854 855 while (rem) { 856 int fraglen = per_fragm; 857 858 if (fraglen > rem) 859 fraglen = rem; 860 rem -= fraglen; 861 tmp = dev_alloc_skb(local->tx_headroom + 862 frag_threshold + 863 tx->sdata->encrypt_headroom + 864 IEEE80211_ENCRYPT_TAILROOM); 865 if (!tmp) 866 return -ENOMEM; 867 868 __skb_queue_tail(&tx->skbs, tmp); 869 870 skb_reserve(tmp, 871 local->tx_headroom + tx->sdata->encrypt_headroom); 872 873 /* copy control information */ 874 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 875 876 info = IEEE80211_SKB_CB(tmp); 877 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 878 IEEE80211_TX_CTL_FIRST_FRAGMENT); 879 880 if (rem) 881 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 882 883 skb_copy_queue_mapping(tmp, skb); 884 tmp->priority = skb->priority; 885 tmp->dev = skb->dev; 886 887 /* copy header and data */ 888 memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); 889 memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); 890 891 pos += fraglen; 892 } 893 894 /* adjust first fragment's length */ 895 skb_trim(skb, hdrlen + per_fragm); 896 return 0; 897 } 898 899 static ieee80211_tx_result debug_noinline 900 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 901 { 902 struct sk_buff *skb = tx->skb; 903 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 904 struct ieee80211_hdr *hdr = (void *)skb->data; 905 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 906 int hdrlen; 907 int fragnum; 908 909 /* no matter what happens, tx->skb moves to tx->skbs */ 910 __skb_queue_tail(&tx->skbs, skb); 911 tx->skb = NULL; 912 913 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 914 return TX_CONTINUE; 915 916 if (tx->local->ops->set_frag_threshold) 917 return TX_CONTINUE; 918 919 /* 920 * Warn when submitting a fragmented A-MPDU frame and drop it. 921 * This scenario is handled in ieee80211_tx_prepare but extra 922 * caution taken here as fragmented ampdu may cause Tx stop. 923 */ 924 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 925 return TX_DROP; 926 927 hdrlen = ieee80211_hdrlen(hdr->frame_control); 928 929 /* internal error, why isn't DONTFRAG set? */ 930 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 931 return TX_DROP; 932 933 /* 934 * Now fragment the frame. This will allocate all the fragments and 935 * chain them (using skb as the first fragment) to skb->next. 936 * During transmission, we will remove the successfully transmitted 937 * fragments from this list. When the low-level driver rejects one 938 * of the fragments then we will simply pretend to accept the skb 939 * but store it away as pending. 940 */ 941 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 942 return TX_DROP; 943 944 /* update duration/seq/flags of fragments */ 945 fragnum = 0; 946 947 skb_queue_walk(&tx->skbs, skb) { 948 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 949 950 hdr = (void *)skb->data; 951 info = IEEE80211_SKB_CB(skb); 952 953 if (!skb_queue_is_last(&tx->skbs, skb)) { 954 hdr->frame_control |= morefrags; 955 /* 956 * No multi-rate retries for fragmented frames, that 957 * would completely throw off the NAV at other STAs. 958 */ 959 info->control.rates[1].idx = -1; 960 info->control.rates[2].idx = -1; 961 info->control.rates[3].idx = -1; 962 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 963 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 964 } else { 965 hdr->frame_control &= ~morefrags; 966 } 967 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 968 fragnum++; 969 } 970 971 return TX_CONTINUE; 972 } 973 974 static ieee80211_tx_result debug_noinline 975 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 976 { 977 struct sk_buff *skb; 978 int ac = -1; 979 980 if (!tx->sta) 981 return TX_CONTINUE; 982 983 skb_queue_walk(&tx->skbs, skb) { 984 ac = skb_get_queue_mapping(skb); 985 tx->sta->tx_fragments++; 986 tx->sta->tx_bytes[ac] += skb->len; 987 } 988 if (ac >= 0) 989 tx->sta->tx_packets[ac]++; 990 991 return TX_CONTINUE; 992 } 993 994 static ieee80211_tx_result debug_noinline 995 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 996 { 997 if (!tx->key) 998 return TX_CONTINUE; 999 1000 switch (tx->key->conf.cipher) { 1001 case WLAN_CIPHER_SUITE_WEP40: 1002 case WLAN_CIPHER_SUITE_WEP104: 1003 return ieee80211_crypto_wep_encrypt(tx); 1004 case WLAN_CIPHER_SUITE_TKIP: 1005 return ieee80211_crypto_tkip_encrypt(tx); 1006 case WLAN_CIPHER_SUITE_CCMP: 1007 return ieee80211_crypto_ccmp_encrypt(tx); 1008 case WLAN_CIPHER_SUITE_AES_CMAC: 1009 return ieee80211_crypto_aes_cmac_encrypt(tx); 1010 default: 1011 return ieee80211_crypto_hw_encrypt(tx); 1012 } 1013 1014 return TX_DROP; 1015 } 1016 1017 static ieee80211_tx_result debug_noinline 1018 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1019 { 1020 struct sk_buff *skb; 1021 struct ieee80211_hdr *hdr; 1022 int next_len; 1023 bool group_addr; 1024 1025 skb_queue_walk(&tx->skbs, skb) { 1026 hdr = (void *) skb->data; 1027 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1028 break; /* must not overwrite AID */ 1029 if (!skb_queue_is_last(&tx->skbs, skb)) { 1030 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1031 next_len = next->len; 1032 } else 1033 next_len = 0; 1034 group_addr = is_multicast_ether_addr(hdr->addr1); 1035 1036 hdr->duration_id = 1037 ieee80211_duration(tx, skb, group_addr, next_len); 1038 } 1039 1040 return TX_CONTINUE; 1041 } 1042 1043 /* actual transmit path */ 1044 1045 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1046 struct sk_buff *skb, 1047 struct ieee80211_tx_info *info, 1048 struct tid_ampdu_tx *tid_tx, 1049 int tid) 1050 { 1051 bool queued = false; 1052 bool reset_agg_timer = false; 1053 struct sk_buff *purge_skb = NULL; 1054 1055 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1056 info->flags |= IEEE80211_TX_CTL_AMPDU; 1057 reset_agg_timer = true; 1058 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1059 /* 1060 * nothing -- this aggregation session is being started 1061 * but that might still fail with the driver 1062 */ 1063 } else { 1064 spin_lock(&tx->sta->lock); 1065 /* 1066 * Need to re-check now, because we may get here 1067 * 1068 * 1) in the window during which the setup is actually 1069 * already done, but not marked yet because not all 1070 * packets are spliced over to the driver pending 1071 * queue yet -- if this happened we acquire the lock 1072 * either before or after the splice happens, but 1073 * need to recheck which of these cases happened. 1074 * 1075 * 2) during session teardown, if the OPERATIONAL bit 1076 * was cleared due to the teardown but the pointer 1077 * hasn't been assigned NULL yet (or we loaded it 1078 * before it was assigned) -- in this case it may 1079 * now be NULL which means we should just let the 1080 * packet pass through because splicing the frames 1081 * back is already done. 1082 */ 1083 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1084 1085 if (!tid_tx) { 1086 /* do nothing, let packet pass through */ 1087 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1088 info->flags |= IEEE80211_TX_CTL_AMPDU; 1089 reset_agg_timer = true; 1090 } else { 1091 queued = true; 1092 info->control.vif = &tx->sdata->vif; 1093 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1094 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1095 __skb_queue_tail(&tid_tx->pending, skb); 1096 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1097 purge_skb = __skb_dequeue(&tid_tx->pending); 1098 } 1099 spin_unlock(&tx->sta->lock); 1100 1101 if (purge_skb) 1102 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1103 } 1104 1105 /* reset session timer */ 1106 if (reset_agg_timer && tid_tx->timeout) 1107 tid_tx->last_tx = jiffies; 1108 1109 return queued; 1110 } 1111 1112 /* 1113 * initialises @tx 1114 */ 1115 static ieee80211_tx_result 1116 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1117 struct ieee80211_tx_data *tx, 1118 struct sk_buff *skb) 1119 { 1120 struct ieee80211_local *local = sdata->local; 1121 struct ieee80211_hdr *hdr; 1122 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1123 int tid; 1124 u8 *qc; 1125 1126 memset(tx, 0, sizeof(*tx)); 1127 tx->skb = skb; 1128 tx->local = local; 1129 tx->sdata = sdata; 1130 __skb_queue_head_init(&tx->skbs); 1131 1132 /* 1133 * If this flag is set to true anywhere, and we get here, 1134 * we are doing the needed processing, so remove the flag 1135 * now. 1136 */ 1137 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1138 1139 hdr = (struct ieee80211_hdr *) skb->data; 1140 1141 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1142 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1143 if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) 1144 return TX_DROP; 1145 } else if (info->flags & (IEEE80211_TX_CTL_INJECTED | 1146 IEEE80211_TX_INTFL_NL80211_FRAME_TX) || 1147 tx->sdata->control_port_protocol == tx->skb->protocol) { 1148 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1149 } 1150 if (!tx->sta) 1151 tx->sta = sta_info_get(sdata, hdr->addr1); 1152 1153 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1154 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1155 (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && 1156 !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { 1157 struct tid_ampdu_tx *tid_tx; 1158 1159 qc = ieee80211_get_qos_ctl(hdr); 1160 tid = *qc & IEEE80211_QOS_CTL_TID_MASK; 1161 1162 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1163 if (tid_tx) { 1164 bool queued; 1165 1166 queued = ieee80211_tx_prep_agg(tx, skb, info, 1167 tid_tx, tid); 1168 1169 if (unlikely(queued)) 1170 return TX_QUEUED; 1171 } 1172 } 1173 1174 if (is_multicast_ether_addr(hdr->addr1)) { 1175 tx->flags &= ~IEEE80211_TX_UNICAST; 1176 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1177 } else 1178 tx->flags |= IEEE80211_TX_UNICAST; 1179 1180 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1181 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1182 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1183 info->flags & IEEE80211_TX_CTL_AMPDU) 1184 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1185 } 1186 1187 if (!tx->sta) 1188 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1189 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) 1190 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1191 1192 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1193 1194 return TX_CONTINUE; 1195 } 1196 1197 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1198 struct ieee80211_vif *vif, 1199 struct ieee80211_sta *sta, 1200 struct sk_buff_head *skbs, 1201 bool txpending) 1202 { 1203 struct ieee80211_tx_control control; 1204 struct sk_buff *skb, *tmp; 1205 unsigned long flags; 1206 1207 skb_queue_walk_safe(skbs, skb, tmp) { 1208 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1209 int q = info->hw_queue; 1210 1211 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1212 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1213 __skb_unlink(skb, skbs); 1214 ieee80211_free_txskb(&local->hw, skb); 1215 continue; 1216 } 1217 #endif 1218 1219 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1220 if (local->queue_stop_reasons[q] || 1221 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1222 if (unlikely(info->flags & 1223 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1224 if (local->queue_stop_reasons[q] & 1225 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1226 /* 1227 * Drop off-channel frames if queues 1228 * are stopped for any reason other 1229 * than off-channel operation. Never 1230 * queue them. 1231 */ 1232 spin_unlock_irqrestore( 1233 &local->queue_stop_reason_lock, 1234 flags); 1235 ieee80211_purge_tx_queue(&local->hw, 1236 skbs); 1237 return true; 1238 } 1239 } else { 1240 1241 /* 1242 * Since queue is stopped, queue up frames for 1243 * later transmission from the tx-pending 1244 * tasklet when the queue is woken again. 1245 */ 1246 if (txpending) 1247 skb_queue_splice_init(skbs, 1248 &local->pending[q]); 1249 else 1250 skb_queue_splice_tail_init(skbs, 1251 &local->pending[q]); 1252 1253 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1254 flags); 1255 return false; 1256 } 1257 } 1258 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1259 1260 info->control.vif = vif; 1261 control.sta = sta; 1262 1263 __skb_unlink(skb, skbs); 1264 drv_tx(local, &control, skb); 1265 } 1266 1267 return true; 1268 } 1269 1270 /* 1271 * Returns false if the frame couldn't be transmitted but was queued instead. 1272 */ 1273 static bool __ieee80211_tx(struct ieee80211_local *local, 1274 struct sk_buff_head *skbs, int led_len, 1275 struct sta_info *sta, bool txpending) 1276 { 1277 struct ieee80211_tx_info *info; 1278 struct ieee80211_sub_if_data *sdata; 1279 struct ieee80211_vif *vif; 1280 struct ieee80211_sta *pubsta; 1281 struct sk_buff *skb; 1282 bool result = true; 1283 __le16 fc; 1284 1285 if (WARN_ON(skb_queue_empty(skbs))) 1286 return true; 1287 1288 skb = skb_peek(skbs); 1289 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1290 info = IEEE80211_SKB_CB(skb); 1291 sdata = vif_to_sdata(info->control.vif); 1292 if (sta && !sta->uploaded) 1293 sta = NULL; 1294 1295 if (sta) 1296 pubsta = &sta->sta; 1297 else 1298 pubsta = NULL; 1299 1300 switch (sdata->vif.type) { 1301 case NL80211_IFTYPE_MONITOR: 1302 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { 1303 vif = &sdata->vif; 1304 break; 1305 } 1306 sdata = rcu_dereference(local->monitor_sdata); 1307 if (sdata) { 1308 vif = &sdata->vif; 1309 info->hw_queue = 1310 vif->hw_queue[skb_get_queue_mapping(skb)]; 1311 } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { 1312 dev_kfree_skb(skb); 1313 return true; 1314 } else 1315 vif = NULL; 1316 break; 1317 case NL80211_IFTYPE_AP_VLAN: 1318 sdata = container_of(sdata->bss, 1319 struct ieee80211_sub_if_data, u.ap); 1320 /* fall through */ 1321 default: 1322 vif = &sdata->vif; 1323 break; 1324 } 1325 1326 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1327 txpending); 1328 1329 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1330 1331 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1332 1333 return result; 1334 } 1335 1336 /* 1337 * Invoke TX handlers, return 0 on success and non-zero if the 1338 * frame was dropped or queued. 1339 */ 1340 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1341 { 1342 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1343 ieee80211_tx_result res = TX_DROP; 1344 1345 #define CALL_TXH(txh) \ 1346 do { \ 1347 res = txh(tx); \ 1348 if (res != TX_CONTINUE) \ 1349 goto txh_done; \ 1350 } while (0) 1351 1352 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1353 CALL_TXH(ieee80211_tx_h_check_assoc); 1354 CALL_TXH(ieee80211_tx_h_ps_buf); 1355 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1356 CALL_TXH(ieee80211_tx_h_select_key); 1357 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1358 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1359 1360 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1361 __skb_queue_tail(&tx->skbs, tx->skb); 1362 tx->skb = NULL; 1363 goto txh_done; 1364 } 1365 1366 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1367 CALL_TXH(ieee80211_tx_h_sequence); 1368 CALL_TXH(ieee80211_tx_h_fragment); 1369 /* handlers after fragment must be aware of tx info fragmentation! */ 1370 CALL_TXH(ieee80211_tx_h_stats); 1371 CALL_TXH(ieee80211_tx_h_encrypt); 1372 if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) 1373 CALL_TXH(ieee80211_tx_h_calculate_duration); 1374 #undef CALL_TXH 1375 1376 txh_done: 1377 if (unlikely(res == TX_DROP)) { 1378 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1379 if (tx->skb) 1380 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1381 else 1382 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1383 return -1; 1384 } else if (unlikely(res == TX_QUEUED)) { 1385 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1386 return -1; 1387 } 1388 1389 return 0; 1390 } 1391 1392 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1393 struct ieee80211_vif *vif, struct sk_buff *skb, 1394 int band, struct ieee80211_sta **sta) 1395 { 1396 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1398 struct ieee80211_tx_data tx; 1399 1400 if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP) 1401 return false; 1402 1403 info->band = band; 1404 info->control.vif = vif; 1405 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1406 1407 if (invoke_tx_handlers(&tx)) 1408 return false; 1409 1410 if (sta) { 1411 if (tx.sta) 1412 *sta = &tx.sta->sta; 1413 else 1414 *sta = NULL; 1415 } 1416 1417 return true; 1418 } 1419 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1420 1421 /* 1422 * Returns false if the frame couldn't be transmitted but was queued instead. 1423 */ 1424 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1425 struct sk_buff *skb, bool txpending, 1426 enum ieee80211_band band) 1427 { 1428 struct ieee80211_local *local = sdata->local; 1429 struct ieee80211_tx_data tx; 1430 ieee80211_tx_result res_prepare; 1431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1432 bool result = true; 1433 int led_len; 1434 1435 if (unlikely(skb->len < 10)) { 1436 dev_kfree_skb(skb); 1437 return true; 1438 } 1439 1440 /* initialises tx */ 1441 led_len = skb->len; 1442 res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); 1443 1444 if (unlikely(res_prepare == TX_DROP)) { 1445 ieee80211_free_txskb(&local->hw, skb); 1446 return true; 1447 } else if (unlikely(res_prepare == TX_QUEUED)) { 1448 return true; 1449 } 1450 1451 info->band = band; 1452 1453 /* set up hw_queue value early */ 1454 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1455 !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) 1456 info->hw_queue = 1457 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1458 1459 if (!invoke_tx_handlers(&tx)) 1460 result = __ieee80211_tx(local, &tx.skbs, led_len, 1461 tx.sta, txpending); 1462 1463 return result; 1464 } 1465 1466 /* device xmit handlers */ 1467 1468 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1469 struct sk_buff *skb, 1470 int head_need, bool may_encrypt) 1471 { 1472 struct ieee80211_local *local = sdata->local; 1473 int tail_need = 0; 1474 1475 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1476 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1477 tail_need -= skb_tailroom(skb); 1478 tail_need = max_t(int, tail_need, 0); 1479 } 1480 1481 if (skb_cloned(skb)) 1482 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1483 else if (head_need || tail_need) 1484 I802_DEBUG_INC(local->tx_expand_skb_head); 1485 else 1486 return 0; 1487 1488 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1489 wiphy_debug(local->hw.wiphy, 1490 "failed to reallocate TX buffer\n"); 1491 return -ENOMEM; 1492 } 1493 1494 return 0; 1495 } 1496 1497 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, 1498 enum ieee80211_band band) 1499 { 1500 struct ieee80211_local *local = sdata->local; 1501 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1502 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1503 int headroom; 1504 bool may_encrypt; 1505 1506 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1507 1508 headroom = local->tx_headroom; 1509 if (may_encrypt) 1510 headroom += sdata->encrypt_headroom; 1511 headroom -= skb_headroom(skb); 1512 headroom = max_t(int, 0, headroom); 1513 1514 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1515 ieee80211_free_txskb(&local->hw, skb); 1516 return; 1517 } 1518 1519 hdr = (struct ieee80211_hdr *) skb->data; 1520 info->control.vif = &sdata->vif; 1521 1522 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1523 if (ieee80211_is_data(hdr->frame_control) && 1524 is_unicast_ether_addr(hdr->addr1)) { 1525 if (mesh_nexthop_resolve(sdata, skb)) 1526 return; /* skb queued: don't free */ 1527 } else { 1528 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1529 } 1530 } 1531 1532 ieee80211_set_qos_hdr(sdata, skb); 1533 ieee80211_tx(sdata, skb, false, band); 1534 } 1535 1536 static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) 1537 { 1538 struct ieee80211_radiotap_iterator iterator; 1539 struct ieee80211_radiotap_header *rthdr = 1540 (struct ieee80211_radiotap_header *) skb->data; 1541 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1542 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1543 NULL); 1544 u16 txflags; 1545 1546 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 1547 IEEE80211_TX_CTL_DONTFRAG; 1548 1549 /* 1550 * for every radiotap entry that is present 1551 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 1552 * entries present, or -EINVAL on error) 1553 */ 1554 1555 while (!ret) { 1556 ret = ieee80211_radiotap_iterator_next(&iterator); 1557 1558 if (ret) 1559 continue; 1560 1561 /* see if this argument is something we can use */ 1562 switch (iterator.this_arg_index) { 1563 /* 1564 * You must take care when dereferencing iterator.this_arg 1565 * for multibyte types... the pointer is not aligned. Use 1566 * get_unaligned((type *)iterator.this_arg) to dereference 1567 * iterator.this_arg for type "type" safely on all arches. 1568 */ 1569 case IEEE80211_RADIOTAP_FLAGS: 1570 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 1571 /* 1572 * this indicates that the skb we have been 1573 * handed has the 32-bit FCS CRC at the end... 1574 * we should react to that by snipping it off 1575 * because it will be recomputed and added 1576 * on transmission 1577 */ 1578 if (skb->len < (iterator._max_length + FCS_LEN)) 1579 return false; 1580 1581 skb_trim(skb, skb->len - FCS_LEN); 1582 } 1583 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 1584 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 1585 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 1586 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 1587 break; 1588 1589 case IEEE80211_RADIOTAP_TX_FLAGS: 1590 txflags = get_unaligned_le16(iterator.this_arg); 1591 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 1592 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1593 break; 1594 1595 /* 1596 * Please update the file 1597 * Documentation/networking/mac80211-injection.txt 1598 * when parsing new fields here. 1599 */ 1600 1601 default: 1602 break; 1603 } 1604 } 1605 1606 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 1607 return false; 1608 1609 /* 1610 * remove the radiotap header 1611 * iterator->_max_length was sanity-checked against 1612 * skb->len by iterator init 1613 */ 1614 skb_pull(skb, iterator._max_length); 1615 1616 return true; 1617 } 1618 1619 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 1620 struct net_device *dev) 1621 { 1622 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 1623 struct ieee80211_chanctx_conf *chanctx_conf; 1624 struct ieee80211_radiotap_header *prthdr = 1625 (struct ieee80211_radiotap_header *)skb->data; 1626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1627 struct ieee80211_hdr *hdr; 1628 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 1629 struct cfg80211_chan_def *chandef; 1630 u16 len_rthdr; 1631 int hdrlen; 1632 1633 /* check for not even having the fixed radiotap header part */ 1634 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 1635 goto fail; /* too short to be possibly valid */ 1636 1637 /* is it a header version we can trust to find length from? */ 1638 if (unlikely(prthdr->it_version)) 1639 goto fail; /* only version 0 is supported */ 1640 1641 /* then there must be a radiotap header with a length we can use */ 1642 len_rthdr = ieee80211_get_radiotap_len(skb->data); 1643 1644 /* does the skb contain enough to deliver on the alleged length? */ 1645 if (unlikely(skb->len < len_rthdr)) 1646 goto fail; /* skb too short for claimed rt header extent */ 1647 1648 /* 1649 * fix up the pointers accounting for the radiotap 1650 * header still being in there. We are being given 1651 * a precooked IEEE80211 header so no need for 1652 * normal processing 1653 */ 1654 skb_set_mac_header(skb, len_rthdr); 1655 /* 1656 * these are just fixed to the end of the rt area since we 1657 * don't have any better information and at this point, nobody cares 1658 */ 1659 skb_set_network_header(skb, len_rthdr); 1660 skb_set_transport_header(skb, len_rthdr); 1661 1662 if (skb->len < len_rthdr + 2) 1663 goto fail; 1664 1665 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 1666 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1667 1668 if (skb->len < len_rthdr + hdrlen) 1669 goto fail; 1670 1671 /* 1672 * Initialize skb->protocol if the injected frame is a data frame 1673 * carrying a rfc1042 header 1674 */ 1675 if (ieee80211_is_data(hdr->frame_control) && 1676 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 1677 u8 *payload = (u8 *)hdr + hdrlen; 1678 1679 if (ether_addr_equal(payload, rfc1042_header)) 1680 skb->protocol = cpu_to_be16((payload[6] << 8) | 1681 payload[7]); 1682 } 1683 1684 memset(info, 0, sizeof(*info)); 1685 1686 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 1687 IEEE80211_TX_CTL_INJECTED; 1688 1689 /* process and remove the injection radiotap header */ 1690 if (!ieee80211_parse_tx_radiotap(skb)) 1691 goto fail; 1692 1693 rcu_read_lock(); 1694 1695 /* 1696 * We process outgoing injected frames that have a local address 1697 * we handle as though they are non-injected frames. 1698 * This code here isn't entirely correct, the local MAC address 1699 * isn't always enough to find the interface to use; for proper 1700 * VLAN/WDS support we will need a different mechanism (which 1701 * likely isn't going to be monitor interfaces). 1702 */ 1703 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1704 1705 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 1706 if (!ieee80211_sdata_running(tmp_sdata)) 1707 continue; 1708 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 1709 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 1710 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 1711 continue; 1712 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 1713 sdata = tmp_sdata; 1714 break; 1715 } 1716 } 1717 1718 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1719 if (!chanctx_conf) { 1720 tmp_sdata = rcu_dereference(local->monitor_sdata); 1721 if (tmp_sdata) 1722 chanctx_conf = 1723 rcu_dereference(tmp_sdata->vif.chanctx_conf); 1724 } 1725 1726 if (chanctx_conf) 1727 chandef = &chanctx_conf->def; 1728 else if (!local->use_chanctx) 1729 chandef = &local->_oper_chandef; 1730 else 1731 goto fail_rcu; 1732 1733 /* 1734 * Frame injection is not allowed if beaconing is not allowed 1735 * or if we need radar detection. Beaconing is usually not allowed when 1736 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 1737 * Passive scan is also used in world regulatory domains where 1738 * your country is not known and as such it should be treated as 1739 * NO TX unless the channel is explicitly allowed in which case 1740 * your current regulatory domain would not have the passive scan 1741 * flag. 1742 * 1743 * Since AP mode uses monitor interfaces to inject/TX management 1744 * frames we can make AP mode the exception to this rule once it 1745 * supports radar detection as its implementation can deal with 1746 * radar detection by itself. We can do that later by adding a 1747 * monitor flag interfaces used for AP support. 1748 */ 1749 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 1750 sdata->vif.type)) 1751 goto fail_rcu; 1752 1753 ieee80211_xmit(sdata, skb, chandef->chan->band); 1754 rcu_read_unlock(); 1755 1756 return NETDEV_TX_OK; 1757 1758 fail_rcu: 1759 rcu_read_unlock(); 1760 fail: 1761 dev_kfree_skb(skb); 1762 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 1763 } 1764 1765 /* 1766 * Measure Tx frame arrival time for Tx latency statistics calculation 1767 * A single Tx frame latency should be measured from when it is entering the 1768 * Kernel until we receive Tx complete confirmation indication and the skb is 1769 * freed. 1770 */ 1771 static void ieee80211_tx_latency_start_msrmnt(struct ieee80211_local *local, 1772 struct sk_buff *skb) 1773 { 1774 struct ieee80211_tx_latency_bin_ranges *tx_latency; 1775 1776 tx_latency = rcu_dereference(local->tx_latency); 1777 if (!tx_latency) 1778 return; 1779 skb->tstamp = ktime_get(); 1780 } 1781 1782 /** 1783 * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type 1784 * subinterfaces (wlan#, WDS, and VLAN interfaces) 1785 * @skb: packet to be sent 1786 * @dev: incoming interface 1787 * 1788 * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will 1789 * not be freed, and caller is responsible for either retrying later or freeing 1790 * skb). 1791 * 1792 * This function takes in an Ethernet header and encapsulates it with suitable 1793 * IEEE 802.11 header based on which interface the packet is coming in. The 1794 * encapsulated packet will then be passed to master interface, wlan#.11, for 1795 * transmission (through low-level driver). 1796 */ 1797 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 1798 struct net_device *dev) 1799 { 1800 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 1801 struct ieee80211_local *local = sdata->local; 1802 struct ieee80211_tx_info *info; 1803 int head_need; 1804 u16 ethertype, hdrlen, meshhdrlen = 0; 1805 __le16 fc; 1806 struct ieee80211_hdr hdr; 1807 struct ieee80211s_hdr mesh_hdr __maybe_unused; 1808 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 1809 const u8 *encaps_data; 1810 int encaps_len, skip_header_bytes; 1811 int nh_pos, h_pos; 1812 struct sta_info *sta = NULL; 1813 bool wme_sta = false, authorized = false, tdls_auth = false; 1814 bool tdls_peer = false, tdls_setup_frame = false; 1815 bool multicast; 1816 u32 info_flags = 0; 1817 u16 info_id = 0; 1818 struct ieee80211_chanctx_conf *chanctx_conf; 1819 struct ieee80211_sub_if_data *ap_sdata; 1820 enum ieee80211_band band; 1821 1822 if (unlikely(skb->len < ETH_HLEN)) 1823 goto fail; 1824 1825 /* convert Ethernet header to proper 802.11 header (based on 1826 * operation mode) */ 1827 ethertype = (skb->data[12] << 8) | skb->data[13]; 1828 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 1829 1830 rcu_read_lock(); 1831 1832 /* Measure frame arrival for Tx latency statistics calculation */ 1833 ieee80211_tx_latency_start_msrmnt(local, skb); 1834 1835 switch (sdata->vif.type) { 1836 case NL80211_IFTYPE_AP_VLAN: 1837 sta = rcu_dereference(sdata->u.vlan.sta); 1838 if (sta) { 1839 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1840 /* RA TA DA SA */ 1841 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 1842 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1843 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1844 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1845 hdrlen = 30; 1846 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 1847 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1848 } 1849 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 1850 u.ap); 1851 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 1852 if (!chanctx_conf) 1853 goto fail_rcu; 1854 band = chanctx_conf->def.chan->band; 1855 if (sta) 1856 break; 1857 /* fall through */ 1858 case NL80211_IFTYPE_AP: 1859 if (sdata->vif.type == NL80211_IFTYPE_AP) 1860 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1861 if (!chanctx_conf) 1862 goto fail_rcu; 1863 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 1864 /* DA BSSID SA */ 1865 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1866 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1867 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 1868 hdrlen = 24; 1869 band = chanctx_conf->def.chan->band; 1870 break; 1871 case NL80211_IFTYPE_WDS: 1872 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 1873 /* RA TA DA SA */ 1874 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 1875 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1876 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1877 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1878 hdrlen = 30; 1879 /* 1880 * This is the exception! WDS style interfaces are prohibited 1881 * when channel contexts are in used so this must be valid 1882 */ 1883 band = local->hw.conf.chandef.chan->band; 1884 break; 1885 #ifdef CONFIG_MAC80211_MESH 1886 case NL80211_IFTYPE_MESH_POINT: 1887 if (!is_multicast_ether_addr(skb->data)) { 1888 struct sta_info *next_hop; 1889 bool mpp_lookup = true; 1890 1891 mpath = mesh_path_lookup(sdata, skb->data); 1892 if (mpath) { 1893 mpp_lookup = false; 1894 next_hop = rcu_dereference(mpath->next_hop); 1895 if (!next_hop || 1896 !(mpath->flags & (MESH_PATH_ACTIVE | 1897 MESH_PATH_RESOLVING))) 1898 mpp_lookup = true; 1899 } 1900 1901 if (mpp_lookup) 1902 mppath = mpp_path_lookup(sdata, skb->data); 1903 1904 if (mppath && mpath) 1905 mesh_path_del(mpath->sdata, mpath->dst); 1906 } 1907 1908 /* 1909 * Use address extension if it is a packet from 1910 * another interface or if we know the destination 1911 * is being proxied by a portal (i.e. portal address 1912 * differs from proxied address) 1913 */ 1914 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 1915 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 1916 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1917 skb->data, skb->data + ETH_ALEN); 1918 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 1919 NULL, NULL); 1920 } else { 1921 /* DS -> MBSS (802.11-2012 13.11.3.3). 1922 * For unicast with unknown forwarding information, 1923 * destination might be in the MBSS or if that fails 1924 * forwarded to another mesh gate. In either case 1925 * resolution will be handled in ieee80211_xmit(), so 1926 * leave the original DA. This also works for mcast */ 1927 const u8 *mesh_da = skb->data; 1928 1929 if (mppath) 1930 mesh_da = mppath->mpp; 1931 else if (mpath) 1932 mesh_da = mpath->dst; 1933 1934 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 1935 mesh_da, sdata->vif.addr); 1936 if (is_multicast_ether_addr(mesh_da)) 1937 /* DA TA mSA AE:SA */ 1938 meshhdrlen = ieee80211_new_mesh_header( 1939 sdata, &mesh_hdr, 1940 skb->data + ETH_ALEN, NULL); 1941 else 1942 /* RA TA mDA mSA AE:DA SA */ 1943 meshhdrlen = ieee80211_new_mesh_header( 1944 sdata, &mesh_hdr, skb->data, 1945 skb->data + ETH_ALEN); 1946 1947 } 1948 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 1949 if (!chanctx_conf) 1950 goto fail_rcu; 1951 band = chanctx_conf->def.chan->band; 1952 break; 1953 #endif 1954 case NL80211_IFTYPE_STATION: 1955 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 1956 sta = sta_info_get(sdata, skb->data); 1957 if (sta) { 1958 authorized = test_sta_flag(sta, 1959 WLAN_STA_AUTHORIZED); 1960 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 1961 tdls_peer = test_sta_flag(sta, 1962 WLAN_STA_TDLS_PEER); 1963 tdls_auth = test_sta_flag(sta, 1964 WLAN_STA_TDLS_PEER_AUTH); 1965 } 1966 1967 if (tdls_peer) 1968 tdls_setup_frame = 1969 ethertype == ETH_P_TDLS && 1970 skb->len > 14 && 1971 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 1972 } 1973 1974 /* 1975 * TDLS link during setup - throw out frames to peer. We allow 1976 * TDLS-setup frames to unauthorized peers for the special case 1977 * of a link teardown after a TDLS sta is removed due to being 1978 * unreachable. 1979 */ 1980 if (tdls_peer && !tdls_auth && !tdls_setup_frame) 1981 goto fail_rcu; 1982 1983 /* send direct packets to authorized TDLS peers */ 1984 if (tdls_peer && tdls_auth) { 1985 /* DA SA BSSID */ 1986 memcpy(hdr.addr1, skb->data, ETH_ALEN); 1987 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 1988 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 1989 hdrlen = 24; 1990 } else if (sdata->u.mgd.use_4addr && 1991 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 1992 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 1993 IEEE80211_FCTL_TODS); 1994 /* RA TA DA SA */ 1995 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 1996 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 1997 memcpy(hdr.addr3, skb->data, ETH_ALEN); 1998 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 1999 hdrlen = 30; 2000 } else { 2001 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2002 /* BSSID SA DA */ 2003 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2004 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2005 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2006 hdrlen = 24; 2007 } 2008 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2009 if (!chanctx_conf) 2010 goto fail_rcu; 2011 band = chanctx_conf->def.chan->band; 2012 break; 2013 case NL80211_IFTYPE_ADHOC: 2014 /* DA SA BSSID */ 2015 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2016 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2017 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2018 hdrlen = 24; 2019 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2020 if (!chanctx_conf) 2021 goto fail_rcu; 2022 band = chanctx_conf->def.chan->band; 2023 break; 2024 default: 2025 goto fail_rcu; 2026 } 2027 2028 /* 2029 * There's no need to try to look up the destination 2030 * if it is a multicast address (which can only happen 2031 * in AP mode) 2032 */ 2033 multicast = is_multicast_ether_addr(hdr.addr1); 2034 if (!multicast) { 2035 sta = sta_info_get(sdata, hdr.addr1); 2036 if (sta) { 2037 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2038 wme_sta = test_sta_flag(sta, WLAN_STA_WME); 2039 } 2040 } 2041 2042 /* For mesh, the use of the QoS header is mandatory */ 2043 if (ieee80211_vif_is_mesh(&sdata->vif)) 2044 wme_sta = true; 2045 2046 /* receiver and we are QoS enabled, use a QoS type frame */ 2047 if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { 2048 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2049 hdrlen += 2; 2050 } 2051 2052 /* 2053 * Drop unicast frames to unauthorised stations unless they are 2054 * EAPOL frames from the local station. 2055 */ 2056 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2057 !multicast && !authorized && 2058 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2059 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2060 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2061 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2062 dev->name, hdr.addr1); 2063 #endif 2064 2065 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2066 2067 goto fail_rcu; 2068 } 2069 2070 if (unlikely(!multicast && skb->sk && 2071 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2072 struct sk_buff *orig_skb = skb; 2073 2074 skb = skb_clone(skb, GFP_ATOMIC); 2075 if (skb) { 2076 unsigned long flags; 2077 int id; 2078 2079 spin_lock_irqsave(&local->ack_status_lock, flags); 2080 id = idr_alloc(&local->ack_status_frames, orig_skb, 2081 1, 0x10000, GFP_ATOMIC); 2082 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2083 2084 if (id >= 0) { 2085 info_id = id; 2086 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2087 } else if (skb_shared(skb)) { 2088 kfree_skb(orig_skb); 2089 } else { 2090 kfree_skb(skb); 2091 skb = orig_skb; 2092 } 2093 } else { 2094 /* couldn't clone -- lose tx status ... */ 2095 skb = orig_skb; 2096 } 2097 } 2098 2099 /* 2100 * If the skb is shared we need to obtain our own copy. 2101 */ 2102 if (skb_shared(skb)) { 2103 struct sk_buff *tmp_skb = skb; 2104 2105 /* can't happen -- skb is a clone if info_id != 0 */ 2106 WARN_ON(info_id); 2107 2108 skb = skb_clone(skb, GFP_ATOMIC); 2109 kfree_skb(tmp_skb); 2110 2111 if (!skb) 2112 goto fail_rcu; 2113 } 2114 2115 hdr.frame_control = fc; 2116 hdr.duration_id = 0; 2117 hdr.seq_ctrl = 0; 2118 2119 skip_header_bytes = ETH_HLEN; 2120 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2121 encaps_data = bridge_tunnel_header; 2122 encaps_len = sizeof(bridge_tunnel_header); 2123 skip_header_bytes -= 2; 2124 } else if (ethertype >= ETH_P_802_3_MIN) { 2125 encaps_data = rfc1042_header; 2126 encaps_len = sizeof(rfc1042_header); 2127 skip_header_bytes -= 2; 2128 } else { 2129 encaps_data = NULL; 2130 encaps_len = 0; 2131 } 2132 2133 nh_pos = skb_network_header(skb) - skb->data; 2134 h_pos = skb_transport_header(skb) - skb->data; 2135 2136 skb_pull(skb, skip_header_bytes); 2137 nh_pos -= skip_header_bytes; 2138 h_pos -= skip_header_bytes; 2139 2140 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2141 2142 /* 2143 * So we need to modify the skb header and hence need a copy of 2144 * that. The head_need variable above doesn't, so far, include 2145 * the needed header space that we don't need right away. If we 2146 * can, then we don't reallocate right now but only after the 2147 * frame arrives at the master device (if it does...) 2148 * 2149 * If we cannot, however, then we will reallocate to include all 2150 * the ever needed space. Also, if we need to reallocate it anyway, 2151 * make it big enough for everything we may ever need. 2152 */ 2153 2154 if (head_need > 0 || skb_cloned(skb)) { 2155 head_need += sdata->encrypt_headroom; 2156 head_need += local->tx_headroom; 2157 head_need = max_t(int, 0, head_need); 2158 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2159 ieee80211_free_txskb(&local->hw, skb); 2160 skb = NULL; 2161 goto fail_rcu; 2162 } 2163 } 2164 2165 if (encaps_data) { 2166 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2167 nh_pos += encaps_len; 2168 h_pos += encaps_len; 2169 } 2170 2171 #ifdef CONFIG_MAC80211_MESH 2172 if (meshhdrlen > 0) { 2173 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2174 nh_pos += meshhdrlen; 2175 h_pos += meshhdrlen; 2176 } 2177 #endif 2178 2179 if (ieee80211_is_data_qos(fc)) { 2180 __le16 *qos_control; 2181 2182 qos_control = (__le16 *) skb_push(skb, 2); 2183 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2184 /* 2185 * Maybe we could actually set some fields here, for now just 2186 * initialise to zero to indicate no special operation. 2187 */ 2188 *qos_control = 0; 2189 } else 2190 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2191 2192 nh_pos += hdrlen; 2193 h_pos += hdrlen; 2194 2195 dev->stats.tx_packets++; 2196 dev->stats.tx_bytes += skb->len; 2197 2198 /* Update skb pointers to various headers since this modified frame 2199 * is going to go through Linux networking code that may potentially 2200 * need things like pointer to IP header. */ 2201 skb_set_mac_header(skb, 0); 2202 skb_set_network_header(skb, nh_pos); 2203 skb_set_transport_header(skb, h_pos); 2204 2205 info = IEEE80211_SKB_CB(skb); 2206 memset(info, 0, sizeof(*info)); 2207 2208 dev->trans_start = jiffies; 2209 2210 info->flags = info_flags; 2211 info->ack_frame_id = info_id; 2212 2213 ieee80211_xmit(sdata, skb, band); 2214 rcu_read_unlock(); 2215 2216 return NETDEV_TX_OK; 2217 2218 fail_rcu: 2219 rcu_read_unlock(); 2220 fail: 2221 dev_kfree_skb(skb); 2222 return NETDEV_TX_OK; 2223 } 2224 2225 2226 /* 2227 * ieee80211_clear_tx_pending may not be called in a context where 2228 * it is possible that it packets could come in again. 2229 */ 2230 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 2231 { 2232 struct sk_buff *skb; 2233 int i; 2234 2235 for (i = 0; i < local->hw.queues; i++) { 2236 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 2237 ieee80211_free_txskb(&local->hw, skb); 2238 } 2239 } 2240 2241 /* 2242 * Returns false if the frame couldn't be transmitted but was queued instead, 2243 * which in this case means re-queued -- take as an indication to stop sending 2244 * more pending frames. 2245 */ 2246 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 2247 struct sk_buff *skb) 2248 { 2249 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2250 struct ieee80211_sub_if_data *sdata; 2251 struct sta_info *sta; 2252 struct ieee80211_hdr *hdr; 2253 bool result; 2254 struct ieee80211_chanctx_conf *chanctx_conf; 2255 2256 sdata = vif_to_sdata(info->control.vif); 2257 2258 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 2259 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2260 if (unlikely(!chanctx_conf)) { 2261 dev_kfree_skb(skb); 2262 return true; 2263 } 2264 result = ieee80211_tx(sdata, skb, true, 2265 chanctx_conf->def.chan->band); 2266 } else { 2267 struct sk_buff_head skbs; 2268 2269 __skb_queue_head_init(&skbs); 2270 __skb_queue_tail(&skbs, skb); 2271 2272 hdr = (struct ieee80211_hdr *)skb->data; 2273 sta = sta_info_get(sdata, hdr->addr1); 2274 2275 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 2276 } 2277 2278 return result; 2279 } 2280 2281 /* 2282 * Transmit all pending packets. Called from tasklet. 2283 */ 2284 void ieee80211_tx_pending(unsigned long data) 2285 { 2286 struct ieee80211_local *local = (struct ieee80211_local *)data; 2287 unsigned long flags; 2288 int i; 2289 bool txok; 2290 2291 rcu_read_lock(); 2292 2293 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 2294 for (i = 0; i < local->hw.queues; i++) { 2295 /* 2296 * If queue is stopped by something other than due to pending 2297 * frames, or we have no pending frames, proceed to next queue. 2298 */ 2299 if (local->queue_stop_reasons[i] || 2300 skb_queue_empty(&local->pending[i])) 2301 continue; 2302 2303 while (!skb_queue_empty(&local->pending[i])) { 2304 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 2305 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2306 2307 if (WARN_ON(!info->control.vif)) { 2308 ieee80211_free_txskb(&local->hw, skb); 2309 continue; 2310 } 2311 2312 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 2313 flags); 2314 2315 txok = ieee80211_tx_pending_skb(local, skb); 2316 spin_lock_irqsave(&local->queue_stop_reason_lock, 2317 flags); 2318 if (!txok) 2319 break; 2320 } 2321 2322 if (skb_queue_empty(&local->pending[i])) 2323 ieee80211_propagate_queue_wake(local, i); 2324 } 2325 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 2326 2327 rcu_read_unlock(); 2328 } 2329 2330 /* functions for drivers to get certain frames */ 2331 2332 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2333 struct ps_data *ps, struct sk_buff *skb, 2334 bool is_template) 2335 { 2336 u8 *pos, *tim; 2337 int aid0 = 0; 2338 int i, have_bits = 0, n1, n2; 2339 2340 /* Generate bitmap for TIM only if there are any STAs in power save 2341 * mode. */ 2342 if (atomic_read(&ps->num_sta_ps) > 0) 2343 /* in the hope that this is faster than 2344 * checking byte-for-byte */ 2345 have_bits = !bitmap_empty((unsigned long *)ps->tim, 2346 IEEE80211_MAX_AID+1); 2347 if (!is_template) { 2348 if (ps->dtim_count == 0) 2349 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 2350 else 2351 ps->dtim_count--; 2352 } 2353 2354 tim = pos = (u8 *) skb_put(skb, 6); 2355 *pos++ = WLAN_EID_TIM; 2356 *pos++ = 4; 2357 *pos++ = ps->dtim_count; 2358 *pos++ = sdata->vif.bss_conf.dtim_period; 2359 2360 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 2361 aid0 = 1; 2362 2363 ps->dtim_bc_mc = aid0 == 1; 2364 2365 if (have_bits) { 2366 /* Find largest even number N1 so that bits numbered 1 through 2367 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 2368 * (N2 + 1) x 8 through 2007 are 0. */ 2369 n1 = 0; 2370 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 2371 if (ps->tim[i]) { 2372 n1 = i & 0xfe; 2373 break; 2374 } 2375 } 2376 n2 = n1; 2377 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 2378 if (ps->tim[i]) { 2379 n2 = i; 2380 break; 2381 } 2382 } 2383 2384 /* Bitmap control */ 2385 *pos++ = n1 | aid0; 2386 /* Part Virt Bitmap */ 2387 skb_put(skb, n2 - n1); 2388 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 2389 2390 tim[1] = n2 - n1 + 4; 2391 } else { 2392 *pos++ = aid0; /* Bitmap control */ 2393 *pos++ = 0; /* Part Virt Bitmap */ 2394 } 2395 } 2396 2397 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 2398 struct ps_data *ps, struct sk_buff *skb, 2399 bool is_template) 2400 { 2401 struct ieee80211_local *local = sdata->local; 2402 2403 /* 2404 * Not very nice, but we want to allow the driver to call 2405 * ieee80211_beacon_get() as a response to the set_tim() 2406 * callback. That, however, is already invoked under the 2407 * sta_lock to guarantee consistent and race-free update 2408 * of the tim bitmap in mac80211 and the driver. 2409 */ 2410 if (local->tim_in_locked_section) { 2411 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 2412 } else { 2413 spin_lock_bh(&local->tim_lock); 2414 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 2415 spin_unlock_bh(&local->tim_lock); 2416 } 2417 2418 return 0; 2419 } 2420 2421 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 2422 struct beacon_data *beacon) 2423 { 2424 struct probe_resp *resp; 2425 u8 *beacon_data; 2426 size_t beacon_data_len; 2427 int i; 2428 u8 count = beacon->csa_current_counter; 2429 2430 switch (sdata->vif.type) { 2431 case NL80211_IFTYPE_AP: 2432 beacon_data = beacon->tail; 2433 beacon_data_len = beacon->tail_len; 2434 break; 2435 case NL80211_IFTYPE_ADHOC: 2436 beacon_data = beacon->head; 2437 beacon_data_len = beacon->head_len; 2438 break; 2439 case NL80211_IFTYPE_MESH_POINT: 2440 beacon_data = beacon->head; 2441 beacon_data_len = beacon->head_len; 2442 break; 2443 default: 2444 return; 2445 } 2446 2447 rcu_read_lock(); 2448 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 2449 resp = rcu_dereference(sdata->u.ap.probe_resp); 2450 2451 if (beacon->csa_counter_offsets[i]) { 2452 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 2453 beacon_data_len)) { 2454 rcu_read_unlock(); 2455 return; 2456 } 2457 2458 beacon_data[beacon->csa_counter_offsets[i]] = count; 2459 } 2460 2461 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 2462 resp->data[resp->csa_counter_offsets[i]] = count; 2463 } 2464 rcu_read_unlock(); 2465 } 2466 2467 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 2468 { 2469 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2470 struct beacon_data *beacon = NULL; 2471 u8 count = 0; 2472 2473 rcu_read_lock(); 2474 2475 if (sdata->vif.type == NL80211_IFTYPE_AP) 2476 beacon = rcu_dereference(sdata->u.ap.beacon); 2477 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 2478 beacon = rcu_dereference(sdata->u.ibss.presp); 2479 else if (ieee80211_vif_is_mesh(&sdata->vif)) 2480 beacon = rcu_dereference(sdata->u.mesh.beacon); 2481 2482 if (!beacon) 2483 goto unlock; 2484 2485 beacon->csa_current_counter--; 2486 2487 /* the counter should never reach 0 */ 2488 WARN_ON_ONCE(!beacon->csa_current_counter); 2489 count = beacon->csa_current_counter; 2490 2491 unlock: 2492 rcu_read_unlock(); 2493 return count; 2494 } 2495 EXPORT_SYMBOL(ieee80211_csa_update_counter); 2496 2497 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 2498 { 2499 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2500 struct beacon_data *beacon = NULL; 2501 u8 *beacon_data; 2502 size_t beacon_data_len; 2503 int ret = false; 2504 2505 if (!ieee80211_sdata_running(sdata)) 2506 return false; 2507 2508 rcu_read_lock(); 2509 if (vif->type == NL80211_IFTYPE_AP) { 2510 struct ieee80211_if_ap *ap = &sdata->u.ap; 2511 2512 beacon = rcu_dereference(ap->beacon); 2513 if (WARN_ON(!beacon || !beacon->tail)) 2514 goto out; 2515 beacon_data = beacon->tail; 2516 beacon_data_len = beacon->tail_len; 2517 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 2518 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2519 2520 beacon = rcu_dereference(ifibss->presp); 2521 if (!beacon) 2522 goto out; 2523 2524 beacon_data = beacon->head; 2525 beacon_data_len = beacon->head_len; 2526 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 2527 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2528 2529 beacon = rcu_dereference(ifmsh->beacon); 2530 if (!beacon) 2531 goto out; 2532 2533 beacon_data = beacon->head; 2534 beacon_data_len = beacon->head_len; 2535 } else { 2536 WARN_ON(1); 2537 goto out; 2538 } 2539 2540 if (!beacon->csa_counter_offsets[0]) 2541 goto out; 2542 2543 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 2544 goto out; 2545 2546 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 2547 ret = true; 2548 out: 2549 rcu_read_unlock(); 2550 2551 return ret; 2552 } 2553 EXPORT_SYMBOL(ieee80211_csa_is_complete); 2554 2555 static struct sk_buff * 2556 __ieee80211_beacon_get(struct ieee80211_hw *hw, 2557 struct ieee80211_vif *vif, 2558 struct ieee80211_mutable_offsets *offs, 2559 bool is_template) 2560 { 2561 struct ieee80211_local *local = hw_to_local(hw); 2562 struct beacon_data *beacon = NULL; 2563 struct sk_buff *skb = NULL; 2564 struct ieee80211_tx_info *info; 2565 struct ieee80211_sub_if_data *sdata = NULL; 2566 enum ieee80211_band band; 2567 struct ieee80211_tx_rate_control txrc; 2568 struct ieee80211_chanctx_conf *chanctx_conf; 2569 int csa_off_base = 0; 2570 2571 rcu_read_lock(); 2572 2573 sdata = vif_to_sdata(vif); 2574 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2575 2576 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 2577 goto out; 2578 2579 if (offs) 2580 memset(offs, 0, sizeof(*offs)); 2581 2582 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2583 struct ieee80211_if_ap *ap = &sdata->u.ap; 2584 2585 beacon = rcu_dereference(ap->beacon); 2586 if (beacon) { 2587 if (beacon->csa_counter_offsets[0]) { 2588 if (!is_template) 2589 ieee80211_csa_update_counter(vif); 2590 2591 ieee80211_set_csa(sdata, beacon); 2592 } 2593 2594 /* 2595 * headroom, head length, 2596 * tail length and maximum TIM length 2597 */ 2598 skb = dev_alloc_skb(local->tx_headroom + 2599 beacon->head_len + 2600 beacon->tail_len + 256 + 2601 local->hw.extra_beacon_tailroom); 2602 if (!skb) 2603 goto out; 2604 2605 skb_reserve(skb, local->tx_headroom); 2606 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2607 beacon->head_len); 2608 2609 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 2610 is_template); 2611 2612 if (offs) { 2613 offs->tim_offset = beacon->head_len; 2614 offs->tim_length = skb->len - beacon->head_len; 2615 2616 /* for AP the csa offsets are from tail */ 2617 csa_off_base = skb->len; 2618 } 2619 2620 if (beacon->tail) 2621 memcpy(skb_put(skb, beacon->tail_len), 2622 beacon->tail, beacon->tail_len); 2623 } else 2624 goto out; 2625 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 2626 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 2627 struct ieee80211_hdr *hdr; 2628 2629 beacon = rcu_dereference(ifibss->presp); 2630 if (!beacon) 2631 goto out; 2632 2633 if (beacon->csa_counter_offsets[0]) { 2634 if (!is_template) 2635 ieee80211_csa_update_counter(vif); 2636 2637 ieee80211_set_csa(sdata, beacon); 2638 } 2639 2640 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 2641 local->hw.extra_beacon_tailroom); 2642 if (!skb) 2643 goto out; 2644 skb_reserve(skb, local->tx_headroom); 2645 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2646 beacon->head_len); 2647 2648 hdr = (struct ieee80211_hdr *) skb->data; 2649 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2650 IEEE80211_STYPE_BEACON); 2651 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2652 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 2653 2654 beacon = rcu_dereference(ifmsh->beacon); 2655 if (!beacon) 2656 goto out; 2657 2658 if (beacon->csa_counter_offsets[0]) { 2659 if (!is_template) 2660 /* TODO: For mesh csa_counter is in TU, so 2661 * decrementing it by one isn't correct, but 2662 * for now we leave it consistent with overall 2663 * mac80211's behavior. 2664 */ 2665 ieee80211_csa_update_counter(vif); 2666 2667 ieee80211_set_csa(sdata, beacon); 2668 } 2669 2670 if (ifmsh->sync_ops) 2671 ifmsh->sync_ops->adjust_tbtt(sdata, beacon); 2672 2673 skb = dev_alloc_skb(local->tx_headroom + 2674 beacon->head_len + 2675 256 + /* TIM IE */ 2676 beacon->tail_len + 2677 local->hw.extra_beacon_tailroom); 2678 if (!skb) 2679 goto out; 2680 skb_reserve(skb, local->tx_headroom); 2681 memcpy(skb_put(skb, beacon->head_len), beacon->head, 2682 beacon->head_len); 2683 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 2684 2685 if (offs) { 2686 offs->tim_offset = beacon->head_len; 2687 offs->tim_length = skb->len - beacon->head_len; 2688 } 2689 2690 memcpy(skb_put(skb, beacon->tail_len), beacon->tail, 2691 beacon->tail_len); 2692 } else { 2693 WARN_ON(1); 2694 goto out; 2695 } 2696 2697 /* CSA offsets */ 2698 if (offs && beacon) { 2699 int i; 2700 2701 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 2702 u16 csa_off = beacon->csa_counter_offsets[i]; 2703 2704 if (!csa_off) 2705 continue; 2706 2707 offs->csa_counter_offs[i] = csa_off_base + csa_off; 2708 } 2709 } 2710 2711 band = chanctx_conf->def.chan->band; 2712 2713 info = IEEE80211_SKB_CB(skb); 2714 2715 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 2716 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2717 info->band = band; 2718 2719 memset(&txrc, 0, sizeof(txrc)); 2720 txrc.hw = hw; 2721 txrc.sband = local->hw.wiphy->bands[band]; 2722 txrc.bss_conf = &sdata->vif.bss_conf; 2723 txrc.skb = skb; 2724 txrc.reported_rate.idx = -1; 2725 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 2726 if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) 2727 txrc.max_rate_idx = -1; 2728 else 2729 txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; 2730 txrc.bss = true; 2731 rate_control_get_rate(sdata, NULL, &txrc); 2732 2733 info->control.vif = vif; 2734 2735 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 2736 IEEE80211_TX_CTL_ASSIGN_SEQ | 2737 IEEE80211_TX_CTL_FIRST_FRAGMENT; 2738 out: 2739 rcu_read_unlock(); 2740 return skb; 2741 2742 } 2743 2744 struct sk_buff * 2745 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 2746 struct ieee80211_vif *vif, 2747 struct ieee80211_mutable_offsets *offs) 2748 { 2749 return __ieee80211_beacon_get(hw, vif, offs, true); 2750 } 2751 EXPORT_SYMBOL(ieee80211_beacon_get_template); 2752 2753 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 2754 struct ieee80211_vif *vif, 2755 u16 *tim_offset, u16 *tim_length) 2756 { 2757 struct ieee80211_mutable_offsets offs = {}; 2758 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 2759 2760 if (tim_offset) 2761 *tim_offset = offs.tim_offset; 2762 2763 if (tim_length) 2764 *tim_length = offs.tim_length; 2765 2766 return bcn; 2767 } 2768 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 2769 2770 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 2771 struct ieee80211_vif *vif) 2772 { 2773 struct ieee80211_if_ap *ap = NULL; 2774 struct sk_buff *skb = NULL; 2775 struct probe_resp *presp = NULL; 2776 struct ieee80211_hdr *hdr; 2777 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 2778 2779 if (sdata->vif.type != NL80211_IFTYPE_AP) 2780 return NULL; 2781 2782 rcu_read_lock(); 2783 2784 ap = &sdata->u.ap; 2785 presp = rcu_dereference(ap->probe_resp); 2786 if (!presp) 2787 goto out; 2788 2789 skb = dev_alloc_skb(presp->len); 2790 if (!skb) 2791 goto out; 2792 2793 memcpy(skb_put(skb, presp->len), presp->data, presp->len); 2794 2795 hdr = (struct ieee80211_hdr *) skb->data; 2796 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 2797 2798 out: 2799 rcu_read_unlock(); 2800 return skb; 2801 } 2802 EXPORT_SYMBOL(ieee80211_proberesp_get); 2803 2804 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 2805 struct ieee80211_vif *vif) 2806 { 2807 struct ieee80211_sub_if_data *sdata; 2808 struct ieee80211_if_managed *ifmgd; 2809 struct ieee80211_pspoll *pspoll; 2810 struct ieee80211_local *local; 2811 struct sk_buff *skb; 2812 2813 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2814 return NULL; 2815 2816 sdata = vif_to_sdata(vif); 2817 ifmgd = &sdata->u.mgd; 2818 local = sdata->local; 2819 2820 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 2821 if (!skb) 2822 return NULL; 2823 2824 skb_reserve(skb, local->hw.extra_tx_headroom); 2825 2826 pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); 2827 memset(pspoll, 0, sizeof(*pspoll)); 2828 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 2829 IEEE80211_STYPE_PSPOLL); 2830 pspoll->aid = cpu_to_le16(ifmgd->aid); 2831 2832 /* aid in PS-Poll has its two MSBs each set to 1 */ 2833 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 2834 2835 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 2836 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 2837 2838 return skb; 2839 } 2840 EXPORT_SYMBOL(ieee80211_pspoll_get); 2841 2842 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 2843 struct ieee80211_vif *vif) 2844 { 2845 struct ieee80211_hdr_3addr *nullfunc; 2846 struct ieee80211_sub_if_data *sdata; 2847 struct ieee80211_if_managed *ifmgd; 2848 struct ieee80211_local *local; 2849 struct sk_buff *skb; 2850 2851 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 2852 return NULL; 2853 2854 sdata = vif_to_sdata(vif); 2855 ifmgd = &sdata->u.mgd; 2856 local = sdata->local; 2857 2858 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); 2859 if (!skb) 2860 return NULL; 2861 2862 skb_reserve(skb, local->hw.extra_tx_headroom); 2863 2864 nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, 2865 sizeof(*nullfunc)); 2866 memset(nullfunc, 0, sizeof(*nullfunc)); 2867 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 2868 IEEE80211_STYPE_NULLFUNC | 2869 IEEE80211_FCTL_TODS); 2870 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 2871 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 2872 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 2873 2874 return skb; 2875 } 2876 EXPORT_SYMBOL(ieee80211_nullfunc_get); 2877 2878 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 2879 struct ieee80211_vif *vif, 2880 const u8 *ssid, size_t ssid_len, 2881 size_t tailroom) 2882 { 2883 struct ieee80211_sub_if_data *sdata; 2884 struct ieee80211_local *local; 2885 struct ieee80211_hdr_3addr *hdr; 2886 struct sk_buff *skb; 2887 size_t ie_ssid_len; 2888 u8 *pos; 2889 2890 sdata = vif_to_sdata(vif); 2891 local = sdata->local; 2892 ie_ssid_len = 2 + ssid_len; 2893 2894 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 2895 ie_ssid_len + tailroom); 2896 if (!skb) 2897 return NULL; 2898 2899 skb_reserve(skb, local->hw.extra_tx_headroom); 2900 2901 hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); 2902 memset(hdr, 0, sizeof(*hdr)); 2903 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 2904 IEEE80211_STYPE_PROBE_REQ); 2905 eth_broadcast_addr(hdr->addr1); 2906 memcpy(hdr->addr2, vif->addr, ETH_ALEN); 2907 eth_broadcast_addr(hdr->addr3); 2908 2909 pos = skb_put(skb, ie_ssid_len); 2910 *pos++ = WLAN_EID_SSID; 2911 *pos++ = ssid_len; 2912 if (ssid_len) 2913 memcpy(pos, ssid, ssid_len); 2914 pos += ssid_len; 2915 2916 return skb; 2917 } 2918 EXPORT_SYMBOL(ieee80211_probereq_get); 2919 2920 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2921 const void *frame, size_t frame_len, 2922 const struct ieee80211_tx_info *frame_txctl, 2923 struct ieee80211_rts *rts) 2924 { 2925 const struct ieee80211_hdr *hdr = frame; 2926 2927 rts->frame_control = 2928 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 2929 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 2930 frame_txctl); 2931 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 2932 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 2933 } 2934 EXPORT_SYMBOL(ieee80211_rts_get); 2935 2936 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 2937 const void *frame, size_t frame_len, 2938 const struct ieee80211_tx_info *frame_txctl, 2939 struct ieee80211_cts *cts) 2940 { 2941 const struct ieee80211_hdr *hdr = frame; 2942 2943 cts->frame_control = 2944 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 2945 cts->duration = ieee80211_ctstoself_duration(hw, vif, 2946 frame_len, frame_txctl); 2947 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 2948 } 2949 EXPORT_SYMBOL(ieee80211_ctstoself_get); 2950 2951 struct sk_buff * 2952 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 2953 struct ieee80211_vif *vif) 2954 { 2955 struct ieee80211_local *local = hw_to_local(hw); 2956 struct sk_buff *skb = NULL; 2957 struct ieee80211_tx_data tx; 2958 struct ieee80211_sub_if_data *sdata; 2959 struct ps_data *ps; 2960 struct ieee80211_tx_info *info; 2961 struct ieee80211_chanctx_conf *chanctx_conf; 2962 2963 sdata = vif_to_sdata(vif); 2964 2965 rcu_read_lock(); 2966 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2967 2968 if (!chanctx_conf) 2969 goto out; 2970 2971 if (sdata->vif.type == NL80211_IFTYPE_AP) { 2972 struct beacon_data *beacon = 2973 rcu_dereference(sdata->u.ap.beacon); 2974 2975 if (!beacon || !beacon->head) 2976 goto out; 2977 2978 ps = &sdata->u.ap.ps; 2979 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2980 ps = &sdata->u.mesh.ps; 2981 } else { 2982 goto out; 2983 } 2984 2985 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 2986 goto out; /* send buffered bc/mc only after DTIM beacon */ 2987 2988 while (1) { 2989 skb = skb_dequeue(&ps->bc_buf); 2990 if (!skb) 2991 goto out; 2992 local->total_ps_buffered--; 2993 2994 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 2995 struct ieee80211_hdr *hdr = 2996 (struct ieee80211_hdr *) skb->data; 2997 /* more buffered multicast/broadcast frames ==> set 2998 * MoreData flag in IEEE 802.11 header to inform PS 2999 * STAs */ 3000 hdr->frame_control |= 3001 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 3002 } 3003 3004 if (sdata->vif.type == NL80211_IFTYPE_AP) 3005 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 3006 if (!ieee80211_tx_prepare(sdata, &tx, skb)) 3007 break; 3008 dev_kfree_skb_any(skb); 3009 } 3010 3011 info = IEEE80211_SKB_CB(skb); 3012 3013 tx.flags |= IEEE80211_TX_PS_BUFFERED; 3014 info->band = chanctx_conf->def.chan->band; 3015 3016 if (invoke_tx_handlers(&tx)) 3017 skb = NULL; 3018 out: 3019 rcu_read_unlock(); 3020 3021 return skb; 3022 } 3023 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 3024 3025 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 3026 struct sk_buff *skb, int tid, 3027 enum ieee80211_band band) 3028 { 3029 int ac = ieee802_1d_to_ac[tid & 7]; 3030 3031 skb_set_mac_header(skb, 0); 3032 skb_set_network_header(skb, 0); 3033 skb_set_transport_header(skb, 0); 3034 3035 skb_set_queue_mapping(skb, ac); 3036 skb->priority = tid; 3037 3038 skb->dev = sdata->dev; 3039 3040 /* 3041 * The other path calling ieee80211_xmit is from the tasklet, 3042 * and while we can handle concurrent transmissions locking 3043 * requirements are that we do not come into tx with bhs on. 3044 */ 3045 local_bh_disable(); 3046 ieee80211_xmit(sdata, skb, band); 3047 local_bh_enable(); 3048 } 3049