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 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright (C) 2018 Intel Corporation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * 14 * Transmit and frame generation functions. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/slab.h> 19 #include <linux/skbuff.h> 20 #include <linux/if_vlan.h> 21 #include <linux/etherdevice.h> 22 #include <linux/bitmap.h> 23 #include <linux/rcupdate.h> 24 #include <linux/export.h> 25 #include <net/net_namespace.h> 26 #include <net/ieee80211_radiotap.h> 27 #include <net/cfg80211.h> 28 #include <net/mac80211.h> 29 #include <net/codel.h> 30 #include <net/codel_impl.h> 31 #include <asm/unaligned.h> 32 #include <net/fq_impl.h> 33 34 #include "ieee80211_i.h" 35 #include "driver-ops.h" 36 #include "led.h" 37 #include "mesh.h" 38 #include "wep.h" 39 #include "wpa.h" 40 #include "wme.h" 41 #include "rate.h" 42 43 /* misc utils */ 44 45 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 46 { 47 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 48 49 u64_stats_update_begin(&tstats->syncp); 50 tstats->tx_packets++; 51 tstats->tx_bytes += len; 52 u64_stats_update_end(&tstats->syncp); 53 } 54 55 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 56 struct sk_buff *skb, int group_addr, 57 int next_frag_len) 58 { 59 int rate, mrate, erp, dur, i, shift = 0; 60 struct ieee80211_rate *txrate; 61 struct ieee80211_local *local = tx->local; 62 struct ieee80211_supported_band *sband; 63 struct ieee80211_hdr *hdr; 64 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 65 struct ieee80211_chanctx_conf *chanctx_conf; 66 u32 rate_flags = 0; 67 68 /* assume HW handles this */ 69 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 70 return 0; 71 72 rcu_read_lock(); 73 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 74 if (chanctx_conf) { 75 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 76 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 77 } 78 rcu_read_unlock(); 79 80 /* uh huh? */ 81 if (WARN_ON_ONCE(tx->rate.idx < 0)) 82 return 0; 83 84 sband = local->hw.wiphy->bands[info->band]; 85 txrate = &sband->bitrates[tx->rate.idx]; 86 87 erp = txrate->flags & IEEE80211_RATE_ERP_G; 88 89 /* 90 * data and mgmt (except PS Poll): 91 * - during CFP: 32768 92 * - during contention period: 93 * if addr1 is group address: 0 94 * if more fragments = 0 and addr1 is individual address: time to 95 * transmit one ACK plus SIFS 96 * if more fragments = 1 and addr1 is individual address: time to 97 * transmit next fragment plus 2 x ACK plus 3 x SIFS 98 * 99 * IEEE 802.11, 9.6: 100 * - control response frame (CTS or ACK) shall be transmitted using the 101 * same rate as the immediately previous frame in the frame exchange 102 * sequence, if this rate belongs to the PHY mandatory rates, or else 103 * at the highest possible rate belonging to the PHY rates in the 104 * BSSBasicRateSet 105 */ 106 hdr = (struct ieee80211_hdr *)skb->data; 107 if (ieee80211_is_ctl(hdr->frame_control)) { 108 /* TODO: These control frames are not currently sent by 109 * mac80211, but should they be implemented, this function 110 * needs to be updated to support duration field calculation. 111 * 112 * RTS: time needed to transmit pending data/mgmt frame plus 113 * one CTS frame plus one ACK frame plus 3 x SIFS 114 * CTS: duration of immediately previous RTS minus time 115 * required to transmit CTS and its SIFS 116 * ACK: 0 if immediately previous directed data/mgmt had 117 * more=0, with more=1 duration in ACK frame is duration 118 * from previous frame minus time needed to transmit ACK 119 * and its SIFS 120 * PS Poll: BIT(15) | BIT(14) | aid 121 */ 122 return 0; 123 } 124 125 /* data/mgmt */ 126 if (0 /* FIX: data/mgmt during CFP */) 127 return cpu_to_le16(32768); 128 129 if (group_addr) /* Group address as the destination - no ACK */ 130 return 0; 131 132 /* Individual destination address: 133 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 134 * CTS and ACK frames shall be transmitted using the highest rate in 135 * basic rate set that is less than or equal to the rate of the 136 * immediately previous frame and that is using the same modulation 137 * (CCK or OFDM). If no basic rate set matches with these requirements, 138 * the highest mandatory rate of the PHY that is less than or equal to 139 * the rate of the previous frame is used. 140 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 141 */ 142 rate = -1; 143 /* use lowest available if everything fails */ 144 mrate = sband->bitrates[0].bitrate; 145 for (i = 0; i < sband->n_bitrates; i++) { 146 struct ieee80211_rate *r = &sband->bitrates[i]; 147 148 if (r->bitrate > txrate->bitrate) 149 break; 150 151 if ((rate_flags & r->flags) != rate_flags) 152 continue; 153 154 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 155 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 156 157 switch (sband->band) { 158 case NL80211_BAND_2GHZ: { 159 u32 flag; 160 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 161 flag = IEEE80211_RATE_MANDATORY_G; 162 else 163 flag = IEEE80211_RATE_MANDATORY_B; 164 if (r->flags & flag) 165 mrate = r->bitrate; 166 break; 167 } 168 case NL80211_BAND_5GHZ: 169 if (r->flags & IEEE80211_RATE_MANDATORY_A) 170 mrate = r->bitrate; 171 break; 172 case NL80211_BAND_60GHZ: 173 /* TODO, for now fall through */ 174 case NUM_NL80211_BANDS: 175 WARN_ON(1); 176 break; 177 } 178 } 179 if (rate == -1) { 180 /* No matching basic rate found; use highest suitable mandatory 181 * PHY rate */ 182 rate = DIV_ROUND_UP(mrate, 1 << shift); 183 } 184 185 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 186 if (ieee80211_is_data_qos(hdr->frame_control) && 187 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 188 dur = 0; 189 else 190 /* Time needed to transmit ACK 191 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 192 * to closest integer */ 193 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 194 tx->sdata->vif.bss_conf.use_short_preamble, 195 shift); 196 197 if (next_frag_len) { 198 /* Frame is fragmented: duration increases with time needed to 199 * transmit next fragment plus ACK and 2 x SIFS. */ 200 dur *= 2; /* ACK + SIFS */ 201 /* next fragment */ 202 dur += ieee80211_frame_duration(sband->band, next_frag_len, 203 txrate->bitrate, erp, 204 tx->sdata->vif.bss_conf.use_short_preamble, 205 shift); 206 } 207 208 return cpu_to_le16(dur); 209 } 210 211 /* tx handlers */ 212 static ieee80211_tx_result debug_noinline 213 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 214 { 215 struct ieee80211_local *local = tx->local; 216 struct ieee80211_if_managed *ifmgd; 217 218 /* driver doesn't support power save */ 219 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 220 return TX_CONTINUE; 221 222 /* hardware does dynamic power save */ 223 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 224 return TX_CONTINUE; 225 226 /* dynamic power save disabled */ 227 if (local->hw.conf.dynamic_ps_timeout <= 0) 228 return TX_CONTINUE; 229 230 /* we are scanning, don't enable power save */ 231 if (local->scanning) 232 return TX_CONTINUE; 233 234 if (!local->ps_sdata) 235 return TX_CONTINUE; 236 237 /* No point if we're going to suspend */ 238 if (local->quiescing) 239 return TX_CONTINUE; 240 241 /* dynamic ps is supported only in managed mode */ 242 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 243 return TX_CONTINUE; 244 245 ifmgd = &tx->sdata->u.mgd; 246 247 /* 248 * Don't wakeup from power save if u-apsd is enabled, voip ac has 249 * u-apsd enabled and the frame is in voip class. This effectively 250 * means that even if all access categories have u-apsd enabled, in 251 * practise u-apsd is only used with the voip ac. This is a 252 * workaround for the case when received voip class packets do not 253 * have correct qos tag for some reason, due the network or the 254 * peer application. 255 * 256 * Note: ifmgd->uapsd_queues access is racy here. If the value is 257 * changed via debugfs, user needs to reassociate manually to have 258 * everything in sync. 259 */ 260 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 261 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 262 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 263 return TX_CONTINUE; 264 265 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 266 ieee80211_stop_queues_by_reason(&local->hw, 267 IEEE80211_MAX_QUEUE_MAP, 268 IEEE80211_QUEUE_STOP_REASON_PS, 269 false); 270 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 271 ieee80211_queue_work(&local->hw, 272 &local->dynamic_ps_disable_work); 273 } 274 275 /* Don't restart the timer if we're not disassociated */ 276 if (!ifmgd->associated) 277 return TX_CONTINUE; 278 279 mod_timer(&local->dynamic_ps_timer, jiffies + 280 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 281 282 return TX_CONTINUE; 283 } 284 285 static ieee80211_tx_result debug_noinline 286 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 287 { 288 289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 291 bool assoc = false; 292 293 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 294 return TX_CONTINUE; 295 296 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 297 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 298 !ieee80211_is_probe_req(hdr->frame_control) && 299 !ieee80211_is_nullfunc(hdr->frame_control)) 300 /* 301 * When software scanning only nullfunc frames (to notify 302 * the sleep state to the AP) and probe requests (for the 303 * active scan) are allowed, all other frames should not be 304 * sent and we should not get here, but if we do 305 * nonetheless, drop them to avoid sending them 306 * off-channel. See the link below and 307 * ieee80211_start_scan() for more. 308 * 309 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 310 */ 311 return TX_DROP; 312 313 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 314 return TX_CONTINUE; 315 316 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 317 return TX_CONTINUE; 318 319 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 320 return TX_CONTINUE; 321 322 if (tx->sta) 323 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 324 325 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 326 if (unlikely(!assoc && 327 ieee80211_is_data(hdr->frame_control))) { 328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 329 sdata_info(tx->sdata, 330 "dropped data frame to not associated station %pM\n", 331 hdr->addr1); 332 #endif 333 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 334 return TX_DROP; 335 } 336 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 337 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 338 /* 339 * No associated STAs - no need to send multicast 340 * frames. 341 */ 342 return TX_DROP; 343 } 344 345 return TX_CONTINUE; 346 } 347 348 /* This function is called whenever the AP is about to exceed the maximum limit 349 * of buffered frames for power saving STAs. This situation should not really 350 * happen often during normal operation, so dropping the oldest buffered packet 351 * from each queue should be OK to make some room for new frames. */ 352 static void purge_old_ps_buffers(struct ieee80211_local *local) 353 { 354 int total = 0, purged = 0; 355 struct sk_buff *skb; 356 struct ieee80211_sub_if_data *sdata; 357 struct sta_info *sta; 358 359 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 360 struct ps_data *ps; 361 362 if (sdata->vif.type == NL80211_IFTYPE_AP) 363 ps = &sdata->u.ap.ps; 364 else if (ieee80211_vif_is_mesh(&sdata->vif)) 365 ps = &sdata->u.mesh.ps; 366 else 367 continue; 368 369 skb = skb_dequeue(&ps->bc_buf); 370 if (skb) { 371 purged++; 372 ieee80211_free_txskb(&local->hw, skb); 373 } 374 total += skb_queue_len(&ps->bc_buf); 375 } 376 377 /* 378 * Drop one frame from each station from the lowest-priority 379 * AC that has frames at all. 380 */ 381 list_for_each_entry_rcu(sta, &local->sta_list, list) { 382 int ac; 383 384 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 385 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 386 total += skb_queue_len(&sta->ps_tx_buf[ac]); 387 if (skb) { 388 purged++; 389 ieee80211_free_txskb(&local->hw, skb); 390 break; 391 } 392 } 393 } 394 395 local->total_ps_buffered = total; 396 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 397 } 398 399 static ieee80211_tx_result 400 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 401 { 402 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 404 struct ps_data *ps; 405 406 /* 407 * broadcast/multicast frame 408 * 409 * If any of the associated/peer stations is in power save mode, 410 * the frame is buffered to be sent after DTIM beacon frame. 411 * This is done either by the hardware or us. 412 */ 413 414 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 415 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 416 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 417 if (!tx->sdata->bss) 418 return TX_CONTINUE; 419 420 ps = &tx->sdata->bss->ps; 421 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 422 ps = &tx->sdata->u.mesh.ps; 423 } else { 424 return TX_CONTINUE; 425 } 426 427 428 /* no buffering for ordered frames */ 429 if (ieee80211_has_order(hdr->frame_control)) 430 return TX_CONTINUE; 431 432 if (ieee80211_is_probe_req(hdr->frame_control)) 433 return TX_CONTINUE; 434 435 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 436 info->hw_queue = tx->sdata->vif.cab_queue; 437 438 /* no stations in PS mode */ 439 if (!atomic_read(&ps->num_sta_ps)) 440 return TX_CONTINUE; 441 442 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 443 444 /* device releases frame after DTIM beacon */ 445 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 446 return TX_CONTINUE; 447 448 /* buffered in mac80211 */ 449 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 450 purge_old_ps_buffers(tx->local); 451 452 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 453 ps_dbg(tx->sdata, 454 "BC TX buffer full - dropping the oldest frame\n"); 455 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 456 } else 457 tx->local->total_ps_buffered++; 458 459 skb_queue_tail(&ps->bc_buf, tx->skb); 460 461 return TX_QUEUED; 462 } 463 464 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 465 struct sk_buff *skb) 466 { 467 if (!ieee80211_is_mgmt(fc)) 468 return 0; 469 470 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 471 return 0; 472 473 if (!ieee80211_is_robust_mgmt_frame(skb)) 474 return 0; 475 476 return 1; 477 } 478 479 static ieee80211_tx_result 480 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 481 { 482 struct sta_info *sta = tx->sta; 483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 484 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 485 struct ieee80211_local *local = tx->local; 486 487 if (unlikely(!sta)) 488 return TX_CONTINUE; 489 490 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 491 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 492 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 493 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 494 int ac = skb_get_queue_mapping(tx->skb); 495 496 if (ieee80211_is_mgmt(hdr->frame_control) && 497 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 498 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 499 return TX_CONTINUE; 500 } 501 502 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 503 sta->sta.addr, sta->sta.aid, ac); 504 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 505 purge_old_ps_buffers(tx->local); 506 507 /* sync with ieee80211_sta_ps_deliver_wakeup */ 508 spin_lock(&sta->ps_lock); 509 /* 510 * STA woke up the meantime and all the frames on ps_tx_buf have 511 * been queued to pending queue. No reordering can happen, go 512 * ahead and Tx the packet. 513 */ 514 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 515 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 516 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 517 spin_unlock(&sta->ps_lock); 518 return TX_CONTINUE; 519 } 520 521 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 522 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 523 ps_dbg(tx->sdata, 524 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 525 sta->sta.addr, ac); 526 ieee80211_free_txskb(&local->hw, old); 527 } else 528 tx->local->total_ps_buffered++; 529 530 info->control.jiffies = jiffies; 531 info->control.vif = &tx->sdata->vif; 532 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 533 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 534 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 535 spin_unlock(&sta->ps_lock); 536 537 if (!timer_pending(&local->sta_cleanup)) 538 mod_timer(&local->sta_cleanup, 539 round_jiffies(jiffies + 540 STA_INFO_CLEANUP_INTERVAL)); 541 542 /* 543 * We queued up some frames, so the TIM bit might 544 * need to be set, recalculate it. 545 */ 546 sta_info_recalc_tim(sta); 547 548 return TX_QUEUED; 549 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 550 ps_dbg(tx->sdata, 551 "STA %pM in PS mode, but polling/in SP -> send frame\n", 552 sta->sta.addr); 553 } 554 555 return TX_CONTINUE; 556 } 557 558 static ieee80211_tx_result debug_noinline 559 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 560 { 561 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 562 return TX_CONTINUE; 563 564 if (tx->flags & IEEE80211_TX_UNICAST) 565 return ieee80211_tx_h_unicast_ps_buf(tx); 566 else 567 return ieee80211_tx_h_multicast_ps_buf(tx); 568 } 569 570 static ieee80211_tx_result debug_noinline 571 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 572 { 573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 574 575 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 576 if (tx->sdata->control_port_no_encrypt) 577 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 578 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 579 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 580 } 581 582 return TX_CONTINUE; 583 } 584 585 static ieee80211_tx_result debug_noinline 586 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 587 { 588 struct ieee80211_key *key; 589 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 590 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 591 592 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 593 tx->key = NULL; 594 else if (tx->sta && 595 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 596 tx->key = key; 597 else if (ieee80211_is_group_privacy_action(tx->skb) && 598 (key = rcu_dereference(tx->sdata->default_multicast_key))) 599 tx->key = key; 600 else if (ieee80211_is_mgmt(hdr->frame_control) && 601 is_multicast_ether_addr(hdr->addr1) && 602 ieee80211_is_robust_mgmt_frame(tx->skb) && 603 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 604 tx->key = key; 605 else if (is_multicast_ether_addr(hdr->addr1) && 606 (key = rcu_dereference(tx->sdata->default_multicast_key))) 607 tx->key = key; 608 else if (!is_multicast_ether_addr(hdr->addr1) && 609 (key = rcu_dereference(tx->sdata->default_unicast_key))) 610 tx->key = key; 611 else 612 tx->key = NULL; 613 614 if (tx->key) { 615 bool skip_hw = false; 616 617 /* TODO: add threshold stuff again */ 618 619 switch (tx->key->conf.cipher) { 620 case WLAN_CIPHER_SUITE_WEP40: 621 case WLAN_CIPHER_SUITE_WEP104: 622 case WLAN_CIPHER_SUITE_TKIP: 623 if (!ieee80211_is_data_present(hdr->frame_control)) 624 tx->key = NULL; 625 break; 626 case WLAN_CIPHER_SUITE_CCMP: 627 case WLAN_CIPHER_SUITE_CCMP_256: 628 case WLAN_CIPHER_SUITE_GCMP: 629 case WLAN_CIPHER_SUITE_GCMP_256: 630 if (!ieee80211_is_data_present(hdr->frame_control) && 631 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 632 tx->skb) && 633 !ieee80211_is_group_privacy_action(tx->skb)) 634 tx->key = NULL; 635 else 636 skip_hw = (tx->key->conf.flags & 637 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 638 ieee80211_is_mgmt(hdr->frame_control); 639 break; 640 case WLAN_CIPHER_SUITE_AES_CMAC: 641 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 642 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 643 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 644 if (!ieee80211_is_mgmt(hdr->frame_control)) 645 tx->key = NULL; 646 break; 647 } 648 649 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 650 !ieee80211_is_deauth(hdr->frame_control))) 651 return TX_DROP; 652 653 if (!skip_hw && tx->key && 654 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 655 info->control.hw_key = &tx->key->conf; 656 } 657 658 return TX_CONTINUE; 659 } 660 661 static ieee80211_tx_result debug_noinline 662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 663 { 664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 665 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 666 struct ieee80211_supported_band *sband; 667 u32 len; 668 struct ieee80211_tx_rate_control txrc; 669 struct ieee80211_sta_rates *ratetbl = NULL; 670 bool assoc = false; 671 672 memset(&txrc, 0, sizeof(txrc)); 673 674 sband = tx->local->hw.wiphy->bands[info->band]; 675 676 len = min_t(u32, tx->skb->len + FCS_LEN, 677 tx->local->hw.wiphy->frag_threshold); 678 679 /* set up the tx rate control struct we give the RC algo */ 680 txrc.hw = &tx->local->hw; 681 txrc.sband = sband; 682 txrc.bss_conf = &tx->sdata->vif.bss_conf; 683 txrc.skb = tx->skb; 684 txrc.reported_rate.idx = -1; 685 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 686 687 if (tx->sdata->rc_has_mcs_mask[info->band]) 688 txrc.rate_idx_mcs_mask = 689 tx->sdata->rc_rateidx_mcs_mask[info->band]; 690 691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 694 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 695 696 /* set up RTS protection if desired */ 697 if (len > tx->local->hw.wiphy->rts_threshold) { 698 txrc.rts = true; 699 } 700 701 info->control.use_rts = txrc.rts; 702 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 703 704 /* 705 * Use short preamble if the BSS can handle it, but not for 706 * management frames unless we know the receiver can handle 707 * that -- the management frame might be to a station that 708 * just wants a probe response. 709 */ 710 if (tx->sdata->vif.bss_conf.use_short_preamble && 711 (ieee80211_is_data(hdr->frame_control) || 712 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 713 txrc.short_preamble = true; 714 715 info->control.short_preamble = txrc.short_preamble; 716 717 /* don't ask rate control when rate already injected via radiotap */ 718 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 719 return TX_CONTINUE; 720 721 if (tx->sta) 722 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 723 724 /* 725 * Lets not bother rate control if we're associated and cannot 726 * talk to the sta. This should not happen. 727 */ 728 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 729 !rate_usable_index_exists(sband, &tx->sta->sta), 730 "%s: Dropped data frame as no usable bitrate found while " 731 "scanning and associated. Target station: " 732 "%pM on %d GHz band\n", 733 tx->sdata->name, hdr->addr1, 734 info->band ? 5 : 2)) 735 return TX_DROP; 736 737 /* 738 * If we're associated with the sta at this point we know we can at 739 * least send the frame at the lowest bit rate. 740 */ 741 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 742 743 if (tx->sta && !info->control.skip_table) 744 ratetbl = rcu_dereference(tx->sta->sta.rates); 745 746 if (unlikely(info->control.rates[0].idx < 0)) { 747 if (ratetbl) { 748 struct ieee80211_tx_rate rate = { 749 .idx = ratetbl->rate[0].idx, 750 .flags = ratetbl->rate[0].flags, 751 .count = ratetbl->rate[0].count 752 }; 753 754 if (ratetbl->rate[0].idx < 0) 755 return TX_DROP; 756 757 tx->rate = rate; 758 } else { 759 return TX_DROP; 760 } 761 } else { 762 tx->rate = info->control.rates[0]; 763 } 764 765 if (txrc.reported_rate.idx < 0) { 766 txrc.reported_rate = tx->rate; 767 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 768 tx->sta->tx_stats.last_rate = txrc.reported_rate; 769 } else if (tx->sta) 770 tx->sta->tx_stats.last_rate = txrc.reported_rate; 771 772 if (ratetbl) 773 return TX_CONTINUE; 774 775 if (unlikely(!info->control.rates[0].count)) 776 info->control.rates[0].count = 1; 777 778 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 779 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 780 info->control.rates[0].count = 1; 781 782 return TX_CONTINUE; 783 } 784 785 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 786 { 787 u16 *seq = &sta->tid_seq[tid]; 788 __le16 ret = cpu_to_le16(*seq); 789 790 /* Increase the sequence number. */ 791 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 792 793 return ret; 794 } 795 796 static ieee80211_tx_result debug_noinline 797 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 798 { 799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 801 int tid; 802 803 /* 804 * Packet injection may want to control the sequence 805 * number, if we have no matching interface then we 806 * neither assign one ourselves nor ask the driver to. 807 */ 808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 809 return TX_CONTINUE; 810 811 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 812 return TX_CONTINUE; 813 814 if (ieee80211_hdrlen(hdr->frame_control) < 24) 815 return TX_CONTINUE; 816 817 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 818 return TX_CONTINUE; 819 820 /* 821 * Anything but QoS data that has a sequence number field 822 * (is long enough) gets a sequence number from the global 823 * counter. QoS data frames with a multicast destination 824 * also use the global counter (802.11-2012 9.3.2.10). 825 */ 826 if (!ieee80211_is_data_qos(hdr->frame_control) || 827 is_multicast_ether_addr(hdr->addr1)) { 828 if (tx->flags & IEEE80211_TX_NO_SEQNO) 829 return TX_CONTINUE; 830 /* driver should assign sequence number */ 831 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 832 /* for pure STA mode without beacons, we can do it */ 833 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 834 tx->sdata->sequence_number += 0x10; 835 if (tx->sta) 836 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 837 return TX_CONTINUE; 838 } 839 840 /* 841 * This should be true for injected/management frames only, for 842 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 843 * above since they are not QoS-data frames. 844 */ 845 if (!tx->sta) 846 return TX_CONTINUE; 847 848 /* include per-STA, per-TID sequence counter */ 849 tid = ieee80211_get_tid(hdr); 850 tx->sta->tx_stats.msdu[tid]++; 851 852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 853 854 return TX_CONTINUE; 855 } 856 857 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 858 struct sk_buff *skb, int hdrlen, 859 int frag_threshold) 860 { 861 struct ieee80211_local *local = tx->local; 862 struct ieee80211_tx_info *info; 863 struct sk_buff *tmp; 864 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 865 int pos = hdrlen + per_fragm; 866 int rem = skb->len - hdrlen - per_fragm; 867 868 if (WARN_ON(rem < 0)) 869 return -EINVAL; 870 871 /* first fragment was already added to queue by caller */ 872 873 while (rem) { 874 int fraglen = per_fragm; 875 876 if (fraglen > rem) 877 fraglen = rem; 878 rem -= fraglen; 879 tmp = dev_alloc_skb(local->tx_headroom + 880 frag_threshold + 881 tx->sdata->encrypt_headroom + 882 IEEE80211_ENCRYPT_TAILROOM); 883 if (!tmp) 884 return -ENOMEM; 885 886 __skb_queue_tail(&tx->skbs, tmp); 887 888 skb_reserve(tmp, 889 local->tx_headroom + tx->sdata->encrypt_headroom); 890 891 /* copy control information */ 892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 893 894 info = IEEE80211_SKB_CB(tmp); 895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 896 IEEE80211_TX_CTL_FIRST_FRAGMENT); 897 898 if (rem) 899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 900 901 skb_copy_queue_mapping(tmp, skb); 902 tmp->priority = skb->priority; 903 tmp->dev = skb->dev; 904 905 /* copy header and data */ 906 skb_put_data(tmp, skb->data, hdrlen); 907 skb_put_data(tmp, skb->data + pos, fraglen); 908 909 pos += fraglen; 910 } 911 912 /* adjust first fragment's length */ 913 skb_trim(skb, hdrlen + per_fragm); 914 return 0; 915 } 916 917 static ieee80211_tx_result debug_noinline 918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 919 { 920 struct sk_buff *skb = tx->skb; 921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 922 struct ieee80211_hdr *hdr = (void *)skb->data; 923 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 924 int hdrlen; 925 int fragnum; 926 927 /* no matter what happens, tx->skb moves to tx->skbs */ 928 __skb_queue_tail(&tx->skbs, skb); 929 tx->skb = NULL; 930 931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 932 return TX_CONTINUE; 933 934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 935 return TX_CONTINUE; 936 937 /* 938 * Warn when submitting a fragmented A-MPDU frame and drop it. 939 * This scenario is handled in ieee80211_tx_prepare but extra 940 * caution taken here as fragmented ampdu may cause Tx stop. 941 */ 942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 943 return TX_DROP; 944 945 hdrlen = ieee80211_hdrlen(hdr->frame_control); 946 947 /* internal error, why isn't DONTFRAG set? */ 948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 949 return TX_DROP; 950 951 /* 952 * Now fragment the frame. This will allocate all the fragments and 953 * chain them (using skb as the first fragment) to skb->next. 954 * During transmission, we will remove the successfully transmitted 955 * fragments from this list. When the low-level driver rejects one 956 * of the fragments then we will simply pretend to accept the skb 957 * but store it away as pending. 958 */ 959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 960 return TX_DROP; 961 962 /* update duration/seq/flags of fragments */ 963 fragnum = 0; 964 965 skb_queue_walk(&tx->skbs, skb) { 966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 967 968 hdr = (void *)skb->data; 969 info = IEEE80211_SKB_CB(skb); 970 971 if (!skb_queue_is_last(&tx->skbs, skb)) { 972 hdr->frame_control |= morefrags; 973 /* 974 * No multi-rate retries for fragmented frames, that 975 * would completely throw off the NAV at other STAs. 976 */ 977 info->control.rates[1].idx = -1; 978 info->control.rates[2].idx = -1; 979 info->control.rates[3].idx = -1; 980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 982 } else { 983 hdr->frame_control &= ~morefrags; 984 } 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 986 fragnum++; 987 } 988 989 return TX_CONTINUE; 990 } 991 992 static ieee80211_tx_result debug_noinline 993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 994 { 995 struct sk_buff *skb; 996 int ac = -1; 997 998 if (!tx->sta) 999 return TX_CONTINUE; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 ac = skb_get_queue_mapping(skb); 1003 tx->sta->tx_stats.bytes[ac] += skb->len; 1004 } 1005 if (ac >= 0) 1006 tx->sta->tx_stats.packets[ac]++; 1007 1008 return TX_CONTINUE; 1009 } 1010 1011 static ieee80211_tx_result debug_noinline 1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1013 { 1014 if (!tx->key) 1015 return TX_CONTINUE; 1016 1017 switch (tx->key->conf.cipher) { 1018 case WLAN_CIPHER_SUITE_WEP40: 1019 case WLAN_CIPHER_SUITE_WEP104: 1020 return ieee80211_crypto_wep_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_TKIP: 1022 return ieee80211_crypto_tkip_encrypt(tx); 1023 case WLAN_CIPHER_SUITE_CCMP: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_CCMP_256: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_256_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_AES_CMAC: 1030 return ieee80211_crypto_aes_cmac_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1035 return ieee80211_crypto_aes_gmac_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_GCMP: 1037 case WLAN_CIPHER_SUITE_GCMP_256: 1038 return ieee80211_crypto_gcmp_encrypt(tx); 1039 default: 1040 return ieee80211_crypto_hw_encrypt(tx); 1041 } 1042 1043 return TX_DROP; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1048 { 1049 struct sk_buff *skb; 1050 struct ieee80211_hdr *hdr; 1051 int next_len; 1052 bool group_addr; 1053 1054 skb_queue_walk(&tx->skbs, skb) { 1055 hdr = (void *) skb->data; 1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1057 break; /* must not overwrite AID */ 1058 if (!skb_queue_is_last(&tx->skbs, skb)) { 1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1060 next_len = next->len; 1061 } else 1062 next_len = 0; 1063 group_addr = is_multicast_ether_addr(hdr->addr1); 1064 1065 hdr->duration_id = 1066 ieee80211_duration(tx, skb, group_addr, next_len); 1067 } 1068 1069 return TX_CONTINUE; 1070 } 1071 1072 /* actual transmit path */ 1073 1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1075 struct sk_buff *skb, 1076 struct ieee80211_tx_info *info, 1077 struct tid_ampdu_tx *tid_tx, 1078 int tid) 1079 { 1080 bool queued = false; 1081 bool reset_agg_timer = false; 1082 struct sk_buff *purge_skb = NULL; 1083 1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1085 info->flags |= IEEE80211_TX_CTL_AMPDU; 1086 reset_agg_timer = true; 1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1088 /* 1089 * nothing -- this aggregation session is being started 1090 * but that might still fail with the driver 1091 */ 1092 } else if (!tx->sta->sta.txq[tid]) { 1093 spin_lock(&tx->sta->lock); 1094 /* 1095 * Need to re-check now, because we may get here 1096 * 1097 * 1) in the window during which the setup is actually 1098 * already done, but not marked yet because not all 1099 * packets are spliced over to the driver pending 1100 * queue yet -- if this happened we acquire the lock 1101 * either before or after the splice happens, but 1102 * need to recheck which of these cases happened. 1103 * 1104 * 2) during session teardown, if the OPERATIONAL bit 1105 * was cleared due to the teardown but the pointer 1106 * hasn't been assigned NULL yet (or we loaded it 1107 * before it was assigned) -- in this case it may 1108 * now be NULL which means we should just let the 1109 * packet pass through because splicing the frames 1110 * back is already done. 1111 */ 1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1113 1114 if (!tid_tx) { 1115 /* do nothing, let packet pass through */ 1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1117 info->flags |= IEEE80211_TX_CTL_AMPDU; 1118 reset_agg_timer = true; 1119 } else { 1120 queued = true; 1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1122 clear_sta_flag(tx->sta, WLAN_STA_SP); 1123 ps_dbg(tx->sta->sdata, 1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1125 tx->sta->sta.addr, tx->sta->sta.aid); 1126 } 1127 info->control.vif = &tx->sdata->vif; 1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1130 __skb_queue_tail(&tid_tx->pending, skb); 1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1132 purge_skb = __skb_dequeue(&tid_tx->pending); 1133 } 1134 spin_unlock(&tx->sta->lock); 1135 1136 if (purge_skb) 1137 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1138 } 1139 1140 /* reset session timer */ 1141 if (reset_agg_timer) 1142 tid_tx->last_tx = jiffies; 1143 1144 return queued; 1145 } 1146 1147 /* 1148 * initialises @tx 1149 * pass %NULL for the station if unknown, a valid pointer if known 1150 * or an ERR_PTR() if the station is known not to exist 1151 */ 1152 static ieee80211_tx_result 1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1154 struct ieee80211_tx_data *tx, 1155 struct sta_info *sta, struct sk_buff *skb) 1156 { 1157 struct ieee80211_local *local = sdata->local; 1158 struct ieee80211_hdr *hdr; 1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1160 int tid; 1161 1162 memset(tx, 0, sizeof(*tx)); 1163 tx->skb = skb; 1164 tx->local = local; 1165 tx->sdata = sdata; 1166 __skb_queue_head_init(&tx->skbs); 1167 1168 /* 1169 * If this flag is set to true anywhere, and we get here, 1170 * we are doing the needed processing, so remove the flag 1171 * now. 1172 */ 1173 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1174 1175 hdr = (struct ieee80211_hdr *) skb->data; 1176 1177 if (likely(sta)) { 1178 if (!IS_ERR(sta)) 1179 tx->sta = sta; 1180 } else { 1181 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1182 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1183 if (!tx->sta && sdata->wdev.use_4addr) 1184 return TX_DROP; 1185 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1186 IEEE80211_TX_CTL_INJECTED) || 1187 tx->sdata->control_port_protocol == tx->skb->protocol) { 1188 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1189 } 1190 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1191 tx->sta = sta_info_get(sdata, hdr->addr1); 1192 } 1193 1194 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1195 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1196 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1197 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1198 struct tid_ampdu_tx *tid_tx; 1199 1200 tid = ieee80211_get_tid(hdr); 1201 1202 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1203 if (tid_tx) { 1204 bool queued; 1205 1206 queued = ieee80211_tx_prep_agg(tx, skb, info, 1207 tid_tx, tid); 1208 1209 if (unlikely(queued)) 1210 return TX_QUEUED; 1211 } 1212 } 1213 1214 if (is_multicast_ether_addr(hdr->addr1)) { 1215 tx->flags &= ~IEEE80211_TX_UNICAST; 1216 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1217 } else 1218 tx->flags |= IEEE80211_TX_UNICAST; 1219 1220 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1221 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1222 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1223 info->flags & IEEE80211_TX_CTL_AMPDU) 1224 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1225 } 1226 1227 if (!tx->sta) 1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1229 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1231 ieee80211_check_fast_xmit(tx->sta); 1232 } 1233 1234 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1235 1236 return TX_CONTINUE; 1237 } 1238 1239 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1240 struct ieee80211_vif *vif, 1241 struct sta_info *sta, 1242 struct sk_buff *skb) 1243 { 1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1245 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1246 struct ieee80211_txq *txq = NULL; 1247 1248 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1249 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1250 return NULL; 1251 1252 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1253 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1254 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1255 vif->type == NL80211_IFTYPE_STATION) && 1256 sta && sta->uploaded) { 1257 /* 1258 * This will be NULL if the driver didn't set the 1259 * opt-in hardware flag. 1260 */ 1261 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1262 } 1263 } else if (sta) { 1264 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1265 1266 if (!sta->uploaded) 1267 return NULL; 1268 1269 txq = sta->sta.txq[tid]; 1270 } else if (vif) { 1271 txq = vif->txq; 1272 } 1273 1274 if (!txq) 1275 return NULL; 1276 1277 return to_txq_info(txq); 1278 } 1279 1280 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1281 { 1282 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1283 } 1284 1285 static u32 codel_skb_len_func(const struct sk_buff *skb) 1286 { 1287 return skb->len; 1288 } 1289 1290 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1291 { 1292 const struct ieee80211_tx_info *info; 1293 1294 info = (const struct ieee80211_tx_info *)skb->cb; 1295 return info->control.enqueue_time; 1296 } 1297 1298 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1299 void *ctx) 1300 { 1301 struct ieee80211_local *local; 1302 struct txq_info *txqi; 1303 struct fq *fq; 1304 struct fq_flow *flow; 1305 1306 txqi = ctx; 1307 local = vif_to_sdata(txqi->txq.vif)->local; 1308 fq = &local->fq; 1309 1310 if (cvars == &txqi->def_cvars) 1311 flow = &txqi->def_flow; 1312 else 1313 flow = &fq->flows[cvars - local->cvars]; 1314 1315 return fq_flow_dequeue(fq, flow); 1316 } 1317 1318 static void codel_drop_func(struct sk_buff *skb, 1319 void *ctx) 1320 { 1321 struct ieee80211_local *local; 1322 struct ieee80211_hw *hw; 1323 struct txq_info *txqi; 1324 1325 txqi = ctx; 1326 local = vif_to_sdata(txqi->txq.vif)->local; 1327 hw = &local->hw; 1328 1329 ieee80211_free_txskb(hw, skb); 1330 } 1331 1332 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1333 struct fq_tin *tin, 1334 struct fq_flow *flow) 1335 { 1336 struct ieee80211_local *local; 1337 struct txq_info *txqi; 1338 struct codel_vars *cvars; 1339 struct codel_params *cparams; 1340 struct codel_stats *cstats; 1341 1342 local = container_of(fq, struct ieee80211_local, fq); 1343 txqi = container_of(tin, struct txq_info, tin); 1344 cstats = &txqi->cstats; 1345 1346 if (txqi->txq.sta) { 1347 struct sta_info *sta = container_of(txqi->txq.sta, 1348 struct sta_info, sta); 1349 cparams = &sta->cparams; 1350 } else { 1351 cparams = &local->cparams; 1352 } 1353 1354 if (flow == &txqi->def_flow) 1355 cvars = &txqi->def_cvars; 1356 else 1357 cvars = &local->cvars[flow - fq->flows]; 1358 1359 return codel_dequeue(txqi, 1360 &flow->backlog, 1361 cparams, 1362 cvars, 1363 cstats, 1364 codel_skb_len_func, 1365 codel_skb_time_func, 1366 codel_drop_func, 1367 codel_dequeue_func); 1368 } 1369 1370 static void fq_skb_free_func(struct fq *fq, 1371 struct fq_tin *tin, 1372 struct fq_flow *flow, 1373 struct sk_buff *skb) 1374 { 1375 struct ieee80211_local *local; 1376 1377 local = container_of(fq, struct ieee80211_local, fq); 1378 ieee80211_free_txskb(&local->hw, skb); 1379 } 1380 1381 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1382 struct fq_tin *tin, 1383 int idx, 1384 struct sk_buff *skb) 1385 { 1386 struct txq_info *txqi; 1387 1388 txqi = container_of(tin, struct txq_info, tin); 1389 return &txqi->def_flow; 1390 } 1391 1392 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1393 struct txq_info *txqi, 1394 struct sk_buff *skb) 1395 { 1396 struct fq *fq = &local->fq; 1397 struct fq_tin *tin = &txqi->tin; 1398 1399 ieee80211_set_skb_enqueue_time(skb); 1400 fq_tin_enqueue(fq, tin, skb, 1401 fq_skb_free_func, 1402 fq_flow_get_default_func); 1403 } 1404 1405 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1406 struct fq_flow *flow, struct sk_buff *skb, 1407 void *data) 1408 { 1409 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1410 1411 return info->control.vif == data; 1412 } 1413 1414 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1415 struct ieee80211_sub_if_data *sdata) 1416 { 1417 struct fq *fq = &local->fq; 1418 struct txq_info *txqi; 1419 struct fq_tin *tin; 1420 struct ieee80211_sub_if_data *ap; 1421 1422 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1423 return; 1424 1425 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1426 1427 if (!ap->vif.txq) 1428 return; 1429 1430 txqi = to_txq_info(ap->vif.txq); 1431 tin = &txqi->tin; 1432 1433 spin_lock_bh(&fq->lock); 1434 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1435 fq_skb_free_func); 1436 spin_unlock_bh(&fq->lock); 1437 } 1438 1439 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1440 struct sta_info *sta, 1441 struct txq_info *txqi, int tid) 1442 { 1443 fq_tin_init(&txqi->tin); 1444 fq_flow_init(&txqi->def_flow); 1445 codel_vars_init(&txqi->def_cvars); 1446 codel_stats_init(&txqi->cstats); 1447 __skb_queue_head_init(&txqi->frags); 1448 1449 txqi->txq.vif = &sdata->vif; 1450 1451 if (!sta) { 1452 sdata->vif.txq = &txqi->txq; 1453 txqi->txq.tid = 0; 1454 txqi->txq.ac = IEEE80211_AC_BE; 1455 1456 return; 1457 } 1458 1459 if (tid == IEEE80211_NUM_TIDS) { 1460 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1461 /* Drivers need to opt in to the management MPDU TXQ */ 1462 if (!ieee80211_hw_check(&sdata->local->hw, 1463 STA_MMPDU_TXQ)) 1464 return; 1465 } else if (!ieee80211_hw_check(&sdata->local->hw, 1466 BUFF_MMPDU_TXQ)) { 1467 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1468 return; 1469 } 1470 txqi->txq.ac = IEEE80211_AC_VO; 1471 } else { 1472 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1473 } 1474 1475 txqi->txq.sta = &sta->sta; 1476 txqi->txq.tid = tid; 1477 sta->sta.txq[tid] = &txqi->txq; 1478 } 1479 1480 void ieee80211_txq_purge(struct ieee80211_local *local, 1481 struct txq_info *txqi) 1482 { 1483 struct fq *fq = &local->fq; 1484 struct fq_tin *tin = &txqi->tin; 1485 1486 fq_tin_reset(fq, tin, fq_skb_free_func); 1487 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1488 } 1489 1490 void ieee80211_txq_set_params(struct ieee80211_local *local) 1491 { 1492 if (local->hw.wiphy->txq_limit) 1493 local->fq.limit = local->hw.wiphy->txq_limit; 1494 else 1495 local->hw.wiphy->txq_limit = local->fq.limit; 1496 1497 if (local->hw.wiphy->txq_memory_limit) 1498 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1499 else 1500 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1501 1502 if (local->hw.wiphy->txq_quantum) 1503 local->fq.quantum = local->hw.wiphy->txq_quantum; 1504 else 1505 local->hw.wiphy->txq_quantum = local->fq.quantum; 1506 } 1507 1508 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1509 { 1510 struct fq *fq = &local->fq; 1511 int ret; 1512 int i; 1513 bool supp_vht = false; 1514 enum nl80211_band band; 1515 1516 if (!local->ops->wake_tx_queue) 1517 return 0; 1518 1519 ret = fq_init(fq, 4096); 1520 if (ret) 1521 return ret; 1522 1523 /* 1524 * If the hardware doesn't support VHT, it is safe to limit the maximum 1525 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1526 */ 1527 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1528 struct ieee80211_supported_band *sband; 1529 1530 sband = local->hw.wiphy->bands[band]; 1531 if (!sband) 1532 continue; 1533 1534 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1535 } 1536 1537 if (!supp_vht) 1538 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1539 1540 codel_params_init(&local->cparams); 1541 local->cparams.interval = MS2TIME(100); 1542 local->cparams.target = MS2TIME(20); 1543 local->cparams.ecn = true; 1544 1545 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1546 GFP_KERNEL); 1547 if (!local->cvars) { 1548 spin_lock_bh(&fq->lock); 1549 fq_reset(fq, fq_skb_free_func); 1550 spin_unlock_bh(&fq->lock); 1551 return -ENOMEM; 1552 } 1553 1554 for (i = 0; i < fq->flows_cnt; i++) 1555 codel_vars_init(&local->cvars[i]); 1556 1557 ieee80211_txq_set_params(local); 1558 1559 return 0; 1560 } 1561 1562 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1563 { 1564 struct fq *fq = &local->fq; 1565 1566 if (!local->ops->wake_tx_queue) 1567 return; 1568 1569 kfree(local->cvars); 1570 local->cvars = NULL; 1571 1572 spin_lock_bh(&fq->lock); 1573 fq_reset(fq, fq_skb_free_func); 1574 spin_unlock_bh(&fq->lock); 1575 } 1576 1577 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1578 struct ieee80211_sub_if_data *sdata, 1579 struct sta_info *sta, 1580 struct sk_buff *skb) 1581 { 1582 struct fq *fq = &local->fq; 1583 struct ieee80211_vif *vif; 1584 struct txq_info *txqi; 1585 1586 if (!local->ops->wake_tx_queue || 1587 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1588 return false; 1589 1590 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1591 sdata = container_of(sdata->bss, 1592 struct ieee80211_sub_if_data, u.ap); 1593 1594 vif = &sdata->vif; 1595 txqi = ieee80211_get_txq(local, vif, sta, skb); 1596 1597 if (!txqi) 1598 return false; 1599 1600 spin_lock_bh(&fq->lock); 1601 ieee80211_txq_enqueue(local, txqi, skb); 1602 spin_unlock_bh(&fq->lock); 1603 1604 drv_wake_tx_queue(local, txqi); 1605 1606 return true; 1607 } 1608 1609 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1610 struct ieee80211_vif *vif, 1611 struct ieee80211_sta *sta, 1612 struct sk_buff_head *skbs, 1613 bool txpending) 1614 { 1615 struct ieee80211_tx_control control = {}; 1616 struct sk_buff *skb, *tmp; 1617 unsigned long flags; 1618 1619 skb_queue_walk_safe(skbs, skb, tmp) { 1620 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1621 int q = info->hw_queue; 1622 1623 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1624 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1625 __skb_unlink(skb, skbs); 1626 ieee80211_free_txskb(&local->hw, skb); 1627 continue; 1628 } 1629 #endif 1630 1631 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1632 if (local->queue_stop_reasons[q] || 1633 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1634 if (unlikely(info->flags & 1635 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1636 if (local->queue_stop_reasons[q] & 1637 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1638 /* 1639 * Drop off-channel frames if queues 1640 * are stopped for any reason other 1641 * than off-channel operation. Never 1642 * queue them. 1643 */ 1644 spin_unlock_irqrestore( 1645 &local->queue_stop_reason_lock, 1646 flags); 1647 ieee80211_purge_tx_queue(&local->hw, 1648 skbs); 1649 return true; 1650 } 1651 } else { 1652 1653 /* 1654 * Since queue is stopped, queue up frames for 1655 * later transmission from the tx-pending 1656 * tasklet when the queue is woken again. 1657 */ 1658 if (txpending) 1659 skb_queue_splice_init(skbs, 1660 &local->pending[q]); 1661 else 1662 skb_queue_splice_tail_init(skbs, 1663 &local->pending[q]); 1664 1665 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1666 flags); 1667 return false; 1668 } 1669 } 1670 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1671 1672 info->control.vif = vif; 1673 control.sta = sta; 1674 1675 __skb_unlink(skb, skbs); 1676 drv_tx(local, &control, skb); 1677 } 1678 1679 return true; 1680 } 1681 1682 /* 1683 * Returns false if the frame couldn't be transmitted but was queued instead. 1684 */ 1685 static bool __ieee80211_tx(struct ieee80211_local *local, 1686 struct sk_buff_head *skbs, int led_len, 1687 struct sta_info *sta, bool txpending) 1688 { 1689 struct ieee80211_tx_info *info; 1690 struct ieee80211_sub_if_data *sdata; 1691 struct ieee80211_vif *vif; 1692 struct ieee80211_sta *pubsta; 1693 struct sk_buff *skb; 1694 bool result = true; 1695 __le16 fc; 1696 1697 if (WARN_ON(skb_queue_empty(skbs))) 1698 return true; 1699 1700 skb = skb_peek(skbs); 1701 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1702 info = IEEE80211_SKB_CB(skb); 1703 sdata = vif_to_sdata(info->control.vif); 1704 if (sta && !sta->uploaded) 1705 sta = NULL; 1706 1707 if (sta) 1708 pubsta = &sta->sta; 1709 else 1710 pubsta = NULL; 1711 1712 switch (sdata->vif.type) { 1713 case NL80211_IFTYPE_MONITOR: 1714 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1715 vif = &sdata->vif; 1716 break; 1717 } 1718 sdata = rcu_dereference(local->monitor_sdata); 1719 if (sdata) { 1720 vif = &sdata->vif; 1721 info->hw_queue = 1722 vif->hw_queue[skb_get_queue_mapping(skb)]; 1723 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1724 ieee80211_purge_tx_queue(&local->hw, skbs); 1725 return true; 1726 } else 1727 vif = NULL; 1728 break; 1729 case NL80211_IFTYPE_AP_VLAN: 1730 sdata = container_of(sdata->bss, 1731 struct ieee80211_sub_if_data, u.ap); 1732 /* fall through */ 1733 default: 1734 vif = &sdata->vif; 1735 break; 1736 } 1737 1738 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1739 txpending); 1740 1741 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1742 1743 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1744 1745 return result; 1746 } 1747 1748 /* 1749 * Invoke TX handlers, return 0 on success and non-zero if the 1750 * frame was dropped or queued. 1751 * 1752 * The handlers are split into an early and late part. The latter is everything 1753 * that can be sensitive to reordering, and will be deferred to after packets 1754 * are dequeued from the intermediate queues (when they are enabled). 1755 */ 1756 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1757 { 1758 ieee80211_tx_result res = TX_DROP; 1759 1760 #define CALL_TXH(txh) \ 1761 do { \ 1762 res = txh(tx); \ 1763 if (res != TX_CONTINUE) \ 1764 goto txh_done; \ 1765 } while (0) 1766 1767 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1768 CALL_TXH(ieee80211_tx_h_check_assoc); 1769 CALL_TXH(ieee80211_tx_h_ps_buf); 1770 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1771 CALL_TXH(ieee80211_tx_h_select_key); 1772 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1773 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1774 1775 txh_done: 1776 if (unlikely(res == TX_DROP)) { 1777 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1778 if (tx->skb) 1779 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1780 else 1781 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1782 return -1; 1783 } else if (unlikely(res == TX_QUEUED)) { 1784 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1785 return -1; 1786 } 1787 1788 return 0; 1789 } 1790 1791 /* 1792 * Late handlers can be called while the sta lock is held. Handlers that can 1793 * cause packets to be generated will cause deadlock! 1794 */ 1795 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1796 { 1797 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1798 ieee80211_tx_result res = TX_CONTINUE; 1799 1800 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1801 __skb_queue_tail(&tx->skbs, tx->skb); 1802 tx->skb = NULL; 1803 goto txh_done; 1804 } 1805 1806 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1807 CALL_TXH(ieee80211_tx_h_sequence); 1808 CALL_TXH(ieee80211_tx_h_fragment); 1809 /* handlers after fragment must be aware of tx info fragmentation! */ 1810 CALL_TXH(ieee80211_tx_h_stats); 1811 CALL_TXH(ieee80211_tx_h_encrypt); 1812 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1813 CALL_TXH(ieee80211_tx_h_calculate_duration); 1814 #undef CALL_TXH 1815 1816 txh_done: 1817 if (unlikely(res == TX_DROP)) { 1818 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1819 if (tx->skb) 1820 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1821 else 1822 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1823 return -1; 1824 } else if (unlikely(res == TX_QUEUED)) { 1825 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1826 return -1; 1827 } 1828 1829 return 0; 1830 } 1831 1832 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1833 { 1834 int r = invoke_tx_handlers_early(tx); 1835 1836 if (r) 1837 return r; 1838 return invoke_tx_handlers_late(tx); 1839 } 1840 1841 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1842 struct ieee80211_vif *vif, struct sk_buff *skb, 1843 int band, struct ieee80211_sta **sta) 1844 { 1845 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1846 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1847 struct ieee80211_tx_data tx; 1848 struct sk_buff *skb2; 1849 1850 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1851 return false; 1852 1853 info->band = band; 1854 info->control.vif = vif; 1855 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1856 1857 if (invoke_tx_handlers(&tx)) 1858 return false; 1859 1860 if (sta) { 1861 if (tx.sta) 1862 *sta = &tx.sta->sta; 1863 else 1864 *sta = NULL; 1865 } 1866 1867 /* this function isn't suitable for fragmented data frames */ 1868 skb2 = __skb_dequeue(&tx.skbs); 1869 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1870 ieee80211_free_txskb(hw, skb2); 1871 ieee80211_purge_tx_queue(hw, &tx.skbs); 1872 return false; 1873 } 1874 1875 return true; 1876 } 1877 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1878 1879 /* 1880 * Returns false if the frame couldn't be transmitted but was queued instead. 1881 */ 1882 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1883 struct sta_info *sta, struct sk_buff *skb, 1884 bool txpending, u32 txdata_flags) 1885 { 1886 struct ieee80211_local *local = sdata->local; 1887 struct ieee80211_tx_data tx; 1888 ieee80211_tx_result res_prepare; 1889 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1890 bool result = true; 1891 int led_len; 1892 1893 if (unlikely(skb->len < 10)) { 1894 dev_kfree_skb(skb); 1895 return true; 1896 } 1897 1898 /* initialises tx */ 1899 led_len = skb->len; 1900 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1901 1902 tx.flags |= txdata_flags; 1903 1904 if (unlikely(res_prepare == TX_DROP)) { 1905 ieee80211_free_txskb(&local->hw, skb); 1906 return true; 1907 } else if (unlikely(res_prepare == TX_QUEUED)) { 1908 return true; 1909 } 1910 1911 /* set up hw_queue value early */ 1912 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1913 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1914 info->hw_queue = 1915 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1916 1917 if (invoke_tx_handlers_early(&tx)) 1918 return false; 1919 1920 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1921 return true; 1922 1923 if (!invoke_tx_handlers_late(&tx)) 1924 result = __ieee80211_tx(local, &tx.skbs, led_len, 1925 tx.sta, txpending); 1926 1927 return result; 1928 } 1929 1930 /* device xmit handlers */ 1931 1932 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1933 struct sk_buff *skb, 1934 int head_need, bool may_encrypt) 1935 { 1936 struct ieee80211_local *local = sdata->local; 1937 int tail_need = 0; 1938 1939 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1940 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1941 tail_need -= skb_tailroom(skb); 1942 tail_need = max_t(int, tail_need, 0); 1943 } 1944 1945 if (skb_cloned(skb) && 1946 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1947 !skb_clone_writable(skb, ETH_HLEN) || 1948 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1949 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1950 else if (head_need || tail_need) 1951 I802_DEBUG_INC(local->tx_expand_skb_head); 1952 else 1953 return 0; 1954 1955 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1956 wiphy_debug(local->hw.wiphy, 1957 "failed to reallocate TX buffer\n"); 1958 return -ENOMEM; 1959 } 1960 1961 return 0; 1962 } 1963 1964 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1965 struct sta_info *sta, struct sk_buff *skb, 1966 u32 txdata_flags) 1967 { 1968 struct ieee80211_local *local = sdata->local; 1969 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1970 struct ieee80211_hdr *hdr; 1971 int headroom; 1972 bool may_encrypt; 1973 1974 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1975 1976 headroom = local->tx_headroom; 1977 if (may_encrypt) 1978 headroom += sdata->encrypt_headroom; 1979 headroom -= skb_headroom(skb); 1980 headroom = max_t(int, 0, headroom); 1981 1982 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1983 ieee80211_free_txskb(&local->hw, skb); 1984 return; 1985 } 1986 1987 hdr = (struct ieee80211_hdr *) skb->data; 1988 info->control.vif = &sdata->vif; 1989 1990 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1991 if (ieee80211_is_data(hdr->frame_control) && 1992 is_unicast_ether_addr(hdr->addr1)) { 1993 if (mesh_nexthop_resolve(sdata, skb)) 1994 return; /* skb queued: don't free */ 1995 } else { 1996 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1997 } 1998 } 1999 2000 ieee80211_set_qos_hdr(sdata, skb); 2001 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 2002 } 2003 2004 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 2005 struct sk_buff *skb) 2006 { 2007 struct ieee80211_radiotap_iterator iterator; 2008 struct ieee80211_radiotap_header *rthdr = 2009 (struct ieee80211_radiotap_header *) skb->data; 2010 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2011 struct ieee80211_supported_band *sband = 2012 local->hw.wiphy->bands[info->band]; 2013 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2014 NULL); 2015 u16 txflags; 2016 u16 rate = 0; 2017 bool rate_found = false; 2018 u8 rate_retries = 0; 2019 u16 rate_flags = 0; 2020 u8 mcs_known, mcs_flags, mcs_bw; 2021 u16 vht_known; 2022 u8 vht_mcs = 0, vht_nss = 0; 2023 int i; 2024 2025 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2026 IEEE80211_TX_CTL_DONTFRAG; 2027 2028 /* 2029 * for every radiotap entry that is present 2030 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2031 * entries present, or -EINVAL on error) 2032 */ 2033 2034 while (!ret) { 2035 ret = ieee80211_radiotap_iterator_next(&iterator); 2036 2037 if (ret) 2038 continue; 2039 2040 /* see if this argument is something we can use */ 2041 switch (iterator.this_arg_index) { 2042 /* 2043 * You must take care when dereferencing iterator.this_arg 2044 * for multibyte types... the pointer is not aligned. Use 2045 * get_unaligned((type *)iterator.this_arg) to dereference 2046 * iterator.this_arg for type "type" safely on all arches. 2047 */ 2048 case IEEE80211_RADIOTAP_FLAGS: 2049 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2050 /* 2051 * this indicates that the skb we have been 2052 * handed has the 32-bit FCS CRC at the end... 2053 * we should react to that by snipping it off 2054 * because it will be recomputed and added 2055 * on transmission 2056 */ 2057 if (skb->len < (iterator._max_length + FCS_LEN)) 2058 return false; 2059 2060 skb_trim(skb, skb->len - FCS_LEN); 2061 } 2062 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2063 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2064 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2065 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2066 break; 2067 2068 case IEEE80211_RADIOTAP_TX_FLAGS: 2069 txflags = get_unaligned_le16(iterator.this_arg); 2070 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2071 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2072 break; 2073 2074 case IEEE80211_RADIOTAP_RATE: 2075 rate = *iterator.this_arg; 2076 rate_flags = 0; 2077 rate_found = true; 2078 break; 2079 2080 case IEEE80211_RADIOTAP_DATA_RETRIES: 2081 rate_retries = *iterator.this_arg; 2082 break; 2083 2084 case IEEE80211_RADIOTAP_MCS: 2085 mcs_known = iterator.this_arg[0]; 2086 mcs_flags = iterator.this_arg[1]; 2087 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2088 break; 2089 2090 rate_found = true; 2091 rate = iterator.this_arg[2]; 2092 rate_flags = IEEE80211_TX_RC_MCS; 2093 2094 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2095 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2096 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2097 2098 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2099 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2100 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2101 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2102 break; 2103 2104 case IEEE80211_RADIOTAP_VHT: 2105 vht_known = get_unaligned_le16(iterator.this_arg); 2106 rate_found = true; 2107 2108 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2109 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2110 (iterator.this_arg[2] & 2111 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2112 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2113 if (vht_known & 2114 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2115 if (iterator.this_arg[3] == 1) 2116 rate_flags |= 2117 IEEE80211_TX_RC_40_MHZ_WIDTH; 2118 else if (iterator.this_arg[3] == 4) 2119 rate_flags |= 2120 IEEE80211_TX_RC_80_MHZ_WIDTH; 2121 else if (iterator.this_arg[3] == 11) 2122 rate_flags |= 2123 IEEE80211_TX_RC_160_MHZ_WIDTH; 2124 } 2125 2126 vht_mcs = iterator.this_arg[4] >> 4; 2127 vht_nss = iterator.this_arg[4] & 0xF; 2128 break; 2129 2130 /* 2131 * Please update the file 2132 * Documentation/networking/mac80211-injection.txt 2133 * when parsing new fields here. 2134 */ 2135 2136 default: 2137 break; 2138 } 2139 } 2140 2141 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2142 return false; 2143 2144 if (rate_found) { 2145 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2146 2147 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2148 info->control.rates[i].idx = -1; 2149 info->control.rates[i].flags = 0; 2150 info->control.rates[i].count = 0; 2151 } 2152 2153 if (rate_flags & IEEE80211_TX_RC_MCS) { 2154 info->control.rates[0].idx = rate; 2155 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2156 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2157 vht_nss); 2158 } else { 2159 for (i = 0; i < sband->n_bitrates; i++) { 2160 if (rate * 5 != sband->bitrates[i].bitrate) 2161 continue; 2162 2163 info->control.rates[0].idx = i; 2164 break; 2165 } 2166 } 2167 2168 if (info->control.rates[0].idx < 0) 2169 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2170 2171 info->control.rates[0].flags = rate_flags; 2172 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2173 local->hw.max_rate_tries); 2174 } 2175 2176 /* 2177 * remove the radiotap header 2178 * iterator->_max_length was sanity-checked against 2179 * skb->len by iterator init 2180 */ 2181 skb_pull(skb, iterator._max_length); 2182 2183 return true; 2184 } 2185 2186 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2187 struct net_device *dev) 2188 { 2189 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2190 struct ieee80211_chanctx_conf *chanctx_conf; 2191 struct ieee80211_radiotap_header *prthdr = 2192 (struct ieee80211_radiotap_header *)skb->data; 2193 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2194 struct ieee80211_hdr *hdr; 2195 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2196 struct cfg80211_chan_def *chandef; 2197 u16 len_rthdr; 2198 int hdrlen; 2199 2200 /* check for not even having the fixed radiotap header part */ 2201 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2202 goto fail; /* too short to be possibly valid */ 2203 2204 /* is it a header version we can trust to find length from? */ 2205 if (unlikely(prthdr->it_version)) 2206 goto fail; /* only version 0 is supported */ 2207 2208 /* then there must be a radiotap header with a length we can use */ 2209 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2210 2211 /* does the skb contain enough to deliver on the alleged length? */ 2212 if (unlikely(skb->len < len_rthdr)) 2213 goto fail; /* skb too short for claimed rt header extent */ 2214 2215 /* 2216 * fix up the pointers accounting for the radiotap 2217 * header still being in there. We are being given 2218 * a precooked IEEE80211 header so no need for 2219 * normal processing 2220 */ 2221 skb_set_mac_header(skb, len_rthdr); 2222 /* 2223 * these are just fixed to the end of the rt area since we 2224 * don't have any better information and at this point, nobody cares 2225 */ 2226 skb_set_network_header(skb, len_rthdr); 2227 skb_set_transport_header(skb, len_rthdr); 2228 2229 if (skb->len < len_rthdr + 2) 2230 goto fail; 2231 2232 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2233 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2234 2235 if (skb->len < len_rthdr + hdrlen) 2236 goto fail; 2237 2238 /* 2239 * Initialize skb->protocol if the injected frame is a data frame 2240 * carrying a rfc1042 header 2241 */ 2242 if (ieee80211_is_data(hdr->frame_control) && 2243 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2244 u8 *payload = (u8 *)hdr + hdrlen; 2245 2246 if (ether_addr_equal(payload, rfc1042_header)) 2247 skb->protocol = cpu_to_be16((payload[6] << 8) | 2248 payload[7]); 2249 } 2250 2251 memset(info, 0, sizeof(*info)); 2252 2253 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2254 IEEE80211_TX_CTL_INJECTED; 2255 2256 rcu_read_lock(); 2257 2258 /* 2259 * We process outgoing injected frames that have a local address 2260 * we handle as though they are non-injected frames. 2261 * This code here isn't entirely correct, the local MAC address 2262 * isn't always enough to find the interface to use; for proper 2263 * VLAN/WDS support we will need a different mechanism (which 2264 * likely isn't going to be monitor interfaces). 2265 */ 2266 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2267 2268 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2269 if (!ieee80211_sdata_running(tmp_sdata)) 2270 continue; 2271 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2272 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2273 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2274 continue; 2275 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2276 sdata = tmp_sdata; 2277 break; 2278 } 2279 } 2280 2281 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2282 if (!chanctx_conf) { 2283 tmp_sdata = rcu_dereference(local->monitor_sdata); 2284 if (tmp_sdata) 2285 chanctx_conf = 2286 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2287 } 2288 2289 if (chanctx_conf) 2290 chandef = &chanctx_conf->def; 2291 else if (!local->use_chanctx) 2292 chandef = &local->_oper_chandef; 2293 else 2294 goto fail_rcu; 2295 2296 /* 2297 * Frame injection is not allowed if beaconing is not allowed 2298 * or if we need radar detection. Beaconing is usually not allowed when 2299 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2300 * Passive scan is also used in world regulatory domains where 2301 * your country is not known and as such it should be treated as 2302 * NO TX unless the channel is explicitly allowed in which case 2303 * your current regulatory domain would not have the passive scan 2304 * flag. 2305 * 2306 * Since AP mode uses monitor interfaces to inject/TX management 2307 * frames we can make AP mode the exception to this rule once it 2308 * supports radar detection as its implementation can deal with 2309 * radar detection by itself. We can do that later by adding a 2310 * monitor flag interfaces used for AP support. 2311 */ 2312 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2313 sdata->vif.type)) 2314 goto fail_rcu; 2315 2316 info->band = chandef->chan->band; 2317 2318 /* process and remove the injection radiotap header */ 2319 if (!ieee80211_parse_tx_radiotap(local, skb)) 2320 goto fail_rcu; 2321 2322 ieee80211_xmit(sdata, NULL, skb, 0); 2323 rcu_read_unlock(); 2324 2325 return NETDEV_TX_OK; 2326 2327 fail_rcu: 2328 rcu_read_unlock(); 2329 fail: 2330 dev_kfree_skb(skb); 2331 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2332 } 2333 2334 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2335 { 2336 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2337 2338 return ethertype == ETH_P_TDLS && 2339 skb->len > 14 && 2340 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2341 } 2342 2343 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2344 struct sk_buff *skb, 2345 struct sta_info **sta_out) 2346 { 2347 struct sta_info *sta; 2348 2349 switch (sdata->vif.type) { 2350 case NL80211_IFTYPE_AP_VLAN: 2351 sta = rcu_dereference(sdata->u.vlan.sta); 2352 if (sta) { 2353 *sta_out = sta; 2354 return 0; 2355 } else if (sdata->wdev.use_4addr) { 2356 return -ENOLINK; 2357 } 2358 /* fall through */ 2359 case NL80211_IFTYPE_AP: 2360 case NL80211_IFTYPE_OCB: 2361 case NL80211_IFTYPE_ADHOC: 2362 if (is_multicast_ether_addr(skb->data)) { 2363 *sta_out = ERR_PTR(-ENOENT); 2364 return 0; 2365 } 2366 sta = sta_info_get_bss(sdata, skb->data); 2367 break; 2368 case NL80211_IFTYPE_WDS: 2369 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2370 break; 2371 #ifdef CONFIG_MAC80211_MESH 2372 case NL80211_IFTYPE_MESH_POINT: 2373 /* determined much later */ 2374 *sta_out = NULL; 2375 return 0; 2376 #endif 2377 case NL80211_IFTYPE_STATION: 2378 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2379 sta = sta_info_get(sdata, skb->data); 2380 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2381 if (test_sta_flag(sta, 2382 WLAN_STA_TDLS_PEER_AUTH)) { 2383 *sta_out = sta; 2384 return 0; 2385 } 2386 2387 /* 2388 * TDLS link during setup - throw out frames to 2389 * peer. Allow TDLS-setup frames to unauthorized 2390 * peers for the special case of a link teardown 2391 * after a TDLS sta is removed due to being 2392 * unreachable. 2393 */ 2394 if (!ieee80211_is_tdls_setup(skb)) 2395 return -EINVAL; 2396 } 2397 2398 } 2399 2400 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2401 if (!sta) 2402 return -ENOLINK; 2403 break; 2404 default: 2405 return -EINVAL; 2406 } 2407 2408 *sta_out = sta ?: ERR_PTR(-ENOENT); 2409 return 0; 2410 } 2411 2412 /** 2413 * ieee80211_build_hdr - build 802.11 header in the given frame 2414 * @sdata: virtual interface to build the header for 2415 * @skb: the skb to build the header in 2416 * @info_flags: skb flags to set 2417 * 2418 * This function takes the skb with 802.3 header and reformats the header to 2419 * the appropriate IEEE 802.11 header based on which interface the packet is 2420 * being transmitted on. 2421 * 2422 * Note that this function also takes care of the TX status request and 2423 * potential unsharing of the SKB - this needs to be interleaved with the 2424 * header building. 2425 * 2426 * The function requires the read-side RCU lock held 2427 * 2428 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2429 */ 2430 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2431 struct sk_buff *skb, u32 info_flags, 2432 struct sta_info *sta) 2433 { 2434 struct ieee80211_local *local = sdata->local; 2435 struct ieee80211_tx_info *info; 2436 int head_need; 2437 u16 ethertype, hdrlen, meshhdrlen = 0; 2438 __le16 fc; 2439 struct ieee80211_hdr hdr; 2440 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2441 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2442 const u8 *encaps_data; 2443 int encaps_len, skip_header_bytes; 2444 bool wme_sta = false, authorized = false; 2445 bool tdls_peer; 2446 bool multicast; 2447 u16 info_id = 0; 2448 struct ieee80211_chanctx_conf *chanctx_conf; 2449 struct ieee80211_sub_if_data *ap_sdata; 2450 enum nl80211_band band; 2451 int ret; 2452 2453 if (IS_ERR(sta)) 2454 sta = NULL; 2455 2456 /* convert Ethernet header to proper 802.11 header (based on 2457 * operation mode) */ 2458 ethertype = (skb->data[12] << 8) | skb->data[13]; 2459 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2460 2461 switch (sdata->vif.type) { 2462 case NL80211_IFTYPE_AP_VLAN: 2463 if (sdata->wdev.use_4addr) { 2464 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2465 /* RA TA DA SA */ 2466 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2467 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2468 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2469 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2470 hdrlen = 30; 2471 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2472 wme_sta = sta->sta.wme; 2473 } 2474 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2475 u.ap); 2476 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2477 if (!chanctx_conf) { 2478 ret = -ENOTCONN; 2479 goto free; 2480 } 2481 band = chanctx_conf->def.chan->band; 2482 if (sdata->wdev.use_4addr) 2483 break; 2484 /* fall through */ 2485 case NL80211_IFTYPE_AP: 2486 if (sdata->vif.type == NL80211_IFTYPE_AP) 2487 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2488 if (!chanctx_conf) { 2489 ret = -ENOTCONN; 2490 goto free; 2491 } 2492 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2493 /* DA BSSID SA */ 2494 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2495 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2496 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2497 hdrlen = 24; 2498 band = chanctx_conf->def.chan->band; 2499 break; 2500 case NL80211_IFTYPE_WDS: 2501 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2502 /* RA TA DA SA */ 2503 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2504 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2505 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2506 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2507 hdrlen = 30; 2508 /* 2509 * This is the exception! WDS style interfaces are prohibited 2510 * when channel contexts are in used so this must be valid 2511 */ 2512 band = local->hw.conf.chandef.chan->band; 2513 break; 2514 #ifdef CONFIG_MAC80211_MESH 2515 case NL80211_IFTYPE_MESH_POINT: 2516 if (!is_multicast_ether_addr(skb->data)) { 2517 struct sta_info *next_hop; 2518 bool mpp_lookup = true; 2519 2520 mpath = mesh_path_lookup(sdata, skb->data); 2521 if (mpath) { 2522 mpp_lookup = false; 2523 next_hop = rcu_dereference(mpath->next_hop); 2524 if (!next_hop || 2525 !(mpath->flags & (MESH_PATH_ACTIVE | 2526 MESH_PATH_RESOLVING))) 2527 mpp_lookup = true; 2528 } 2529 2530 if (mpp_lookup) { 2531 mppath = mpp_path_lookup(sdata, skb->data); 2532 if (mppath) 2533 mppath->exp_time = jiffies; 2534 } 2535 2536 if (mppath && mpath) 2537 mesh_path_del(sdata, mpath->dst); 2538 } 2539 2540 /* 2541 * Use address extension if it is a packet from 2542 * another interface or if we know the destination 2543 * is being proxied by a portal (i.e. portal address 2544 * differs from proxied address) 2545 */ 2546 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2547 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2548 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2549 skb->data, skb->data + ETH_ALEN); 2550 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2551 NULL, NULL); 2552 } else { 2553 /* DS -> MBSS (802.11-2012 13.11.3.3). 2554 * For unicast with unknown forwarding information, 2555 * destination might be in the MBSS or if that fails 2556 * forwarded to another mesh gate. In either case 2557 * resolution will be handled in ieee80211_xmit(), so 2558 * leave the original DA. This also works for mcast */ 2559 const u8 *mesh_da = skb->data; 2560 2561 if (mppath) 2562 mesh_da = mppath->mpp; 2563 else if (mpath) 2564 mesh_da = mpath->dst; 2565 2566 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2567 mesh_da, sdata->vif.addr); 2568 if (is_multicast_ether_addr(mesh_da)) 2569 /* DA TA mSA AE:SA */ 2570 meshhdrlen = ieee80211_new_mesh_header( 2571 sdata, &mesh_hdr, 2572 skb->data + ETH_ALEN, NULL); 2573 else 2574 /* RA TA mDA mSA AE:DA SA */ 2575 meshhdrlen = ieee80211_new_mesh_header( 2576 sdata, &mesh_hdr, skb->data, 2577 skb->data + ETH_ALEN); 2578 2579 } 2580 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2581 if (!chanctx_conf) { 2582 ret = -ENOTCONN; 2583 goto free; 2584 } 2585 band = chanctx_conf->def.chan->band; 2586 break; 2587 #endif 2588 case NL80211_IFTYPE_STATION: 2589 /* we already did checks when looking up the RA STA */ 2590 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2591 2592 if (tdls_peer) { 2593 /* DA SA BSSID */ 2594 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2595 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2596 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2597 hdrlen = 24; 2598 } else if (sdata->u.mgd.use_4addr && 2599 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2600 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2601 IEEE80211_FCTL_TODS); 2602 /* RA TA DA SA */ 2603 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2604 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2605 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2606 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2607 hdrlen = 30; 2608 } else { 2609 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2610 /* BSSID SA DA */ 2611 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2612 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2613 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2614 hdrlen = 24; 2615 } 2616 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2617 if (!chanctx_conf) { 2618 ret = -ENOTCONN; 2619 goto free; 2620 } 2621 band = chanctx_conf->def.chan->band; 2622 break; 2623 case NL80211_IFTYPE_OCB: 2624 /* DA SA BSSID */ 2625 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2626 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2627 eth_broadcast_addr(hdr.addr3); 2628 hdrlen = 24; 2629 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2630 if (!chanctx_conf) { 2631 ret = -ENOTCONN; 2632 goto free; 2633 } 2634 band = chanctx_conf->def.chan->band; 2635 break; 2636 case NL80211_IFTYPE_ADHOC: 2637 /* DA SA BSSID */ 2638 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2639 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2640 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2641 hdrlen = 24; 2642 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2643 if (!chanctx_conf) { 2644 ret = -ENOTCONN; 2645 goto free; 2646 } 2647 band = chanctx_conf->def.chan->band; 2648 break; 2649 default: 2650 ret = -EINVAL; 2651 goto free; 2652 } 2653 2654 multicast = is_multicast_ether_addr(hdr.addr1); 2655 2656 /* sta is always NULL for mesh */ 2657 if (sta) { 2658 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2659 wme_sta = sta->sta.wme; 2660 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2661 /* For mesh, the use of the QoS header is mandatory */ 2662 wme_sta = true; 2663 } 2664 2665 /* receiver does QoS (which also means we do) use it */ 2666 if (wme_sta) { 2667 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2668 hdrlen += 2; 2669 } 2670 2671 /* 2672 * Drop unicast frames to unauthorised stations unless they are 2673 * EAPOL frames from the local station. 2674 */ 2675 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2676 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2677 !multicast && !authorized && 2678 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2679 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2680 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2681 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2682 sdata->name, hdr.addr1); 2683 #endif 2684 2685 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2686 2687 ret = -EPERM; 2688 goto free; 2689 } 2690 2691 if (unlikely(!multicast && skb->sk && 2692 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2693 struct sk_buff *ack_skb = skb_clone_sk(skb); 2694 2695 if (ack_skb) { 2696 unsigned long flags; 2697 int id; 2698 2699 spin_lock_irqsave(&local->ack_status_lock, flags); 2700 id = idr_alloc(&local->ack_status_frames, ack_skb, 2701 1, 0x10000, GFP_ATOMIC); 2702 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2703 2704 if (id >= 0) { 2705 info_id = id; 2706 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2707 } else { 2708 kfree_skb(ack_skb); 2709 } 2710 } 2711 } 2712 2713 /* 2714 * If the skb is shared we need to obtain our own copy. 2715 */ 2716 if (skb_shared(skb)) { 2717 struct sk_buff *tmp_skb = skb; 2718 2719 /* can't happen -- skb is a clone if info_id != 0 */ 2720 WARN_ON(info_id); 2721 2722 skb = skb_clone(skb, GFP_ATOMIC); 2723 kfree_skb(tmp_skb); 2724 2725 if (!skb) { 2726 ret = -ENOMEM; 2727 goto free; 2728 } 2729 } 2730 2731 hdr.frame_control = fc; 2732 hdr.duration_id = 0; 2733 hdr.seq_ctrl = 0; 2734 2735 skip_header_bytes = ETH_HLEN; 2736 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2737 encaps_data = bridge_tunnel_header; 2738 encaps_len = sizeof(bridge_tunnel_header); 2739 skip_header_bytes -= 2; 2740 } else if (ethertype >= ETH_P_802_3_MIN) { 2741 encaps_data = rfc1042_header; 2742 encaps_len = sizeof(rfc1042_header); 2743 skip_header_bytes -= 2; 2744 } else { 2745 encaps_data = NULL; 2746 encaps_len = 0; 2747 } 2748 2749 skb_pull(skb, skip_header_bytes); 2750 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2751 2752 /* 2753 * So we need to modify the skb header and hence need a copy of 2754 * that. The head_need variable above doesn't, so far, include 2755 * the needed header space that we don't need right away. If we 2756 * can, then we don't reallocate right now but only after the 2757 * frame arrives at the master device (if it does...) 2758 * 2759 * If we cannot, however, then we will reallocate to include all 2760 * the ever needed space. Also, if we need to reallocate it anyway, 2761 * make it big enough for everything we may ever need. 2762 */ 2763 2764 if (head_need > 0 || skb_cloned(skb)) { 2765 head_need += sdata->encrypt_headroom; 2766 head_need += local->tx_headroom; 2767 head_need = max_t(int, 0, head_need); 2768 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2769 ieee80211_free_txskb(&local->hw, skb); 2770 skb = NULL; 2771 return ERR_PTR(-ENOMEM); 2772 } 2773 } 2774 2775 if (encaps_data) 2776 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2777 2778 #ifdef CONFIG_MAC80211_MESH 2779 if (meshhdrlen > 0) 2780 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2781 #endif 2782 2783 if (ieee80211_is_data_qos(fc)) { 2784 __le16 *qos_control; 2785 2786 qos_control = skb_push(skb, 2); 2787 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2788 /* 2789 * Maybe we could actually set some fields here, for now just 2790 * initialise to zero to indicate no special operation. 2791 */ 2792 *qos_control = 0; 2793 } else 2794 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2795 2796 skb_reset_mac_header(skb); 2797 2798 info = IEEE80211_SKB_CB(skb); 2799 memset(info, 0, sizeof(*info)); 2800 2801 info->flags = info_flags; 2802 info->ack_frame_id = info_id; 2803 info->band = band; 2804 2805 return skb; 2806 free: 2807 kfree_skb(skb); 2808 return ERR_PTR(ret); 2809 } 2810 2811 /* 2812 * fast-xmit overview 2813 * 2814 * The core idea of this fast-xmit is to remove per-packet checks by checking 2815 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2816 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2817 * much less work can be done per packet. For example, fragmentation must be 2818 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2819 * in the code here. 2820 * 2821 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2822 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2823 * 2824 * The most difficult part of this is that when any of these assumptions 2825 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2826 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2827 * since the per-packet code no longer checks the conditions. This is reflected 2828 * by the calls to these functions throughout the rest of the code, and must be 2829 * maintained if any of the TX path checks change. 2830 */ 2831 2832 void ieee80211_check_fast_xmit(struct sta_info *sta) 2833 { 2834 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2835 struct ieee80211_local *local = sta->local; 2836 struct ieee80211_sub_if_data *sdata = sta->sdata; 2837 struct ieee80211_hdr *hdr = (void *)build.hdr; 2838 struct ieee80211_chanctx_conf *chanctx_conf; 2839 __le16 fc; 2840 2841 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2842 return; 2843 2844 /* Locking here protects both the pointer itself, and against concurrent 2845 * invocations winning data access races to, e.g., the key pointer that 2846 * is used. 2847 * Without it, the invocation of this function right after the key 2848 * pointer changes wouldn't be sufficient, as another CPU could access 2849 * the pointer, then stall, and then do the cache update after the CPU 2850 * that invalidated the key. 2851 * With the locking, such scenarios cannot happen as the check for the 2852 * key and the fast-tx assignment are done atomically, so the CPU that 2853 * modifies the key will either wait or other one will see the key 2854 * cleared/changed already. 2855 */ 2856 spin_lock_bh(&sta->lock); 2857 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2858 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2859 sdata->vif.type == NL80211_IFTYPE_STATION) 2860 goto out; 2861 2862 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2863 goto out; 2864 2865 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2866 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2867 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2868 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2869 goto out; 2870 2871 if (sdata->noack_map) 2872 goto out; 2873 2874 /* fast-xmit doesn't handle fragmentation at all */ 2875 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2876 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2877 goto out; 2878 2879 rcu_read_lock(); 2880 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2881 if (!chanctx_conf) { 2882 rcu_read_unlock(); 2883 goto out; 2884 } 2885 build.band = chanctx_conf->def.chan->band; 2886 rcu_read_unlock(); 2887 2888 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2889 2890 switch (sdata->vif.type) { 2891 case NL80211_IFTYPE_ADHOC: 2892 /* DA SA BSSID */ 2893 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2894 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2895 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2896 build.hdr_len = 24; 2897 break; 2898 case NL80211_IFTYPE_STATION: 2899 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2900 /* DA SA BSSID */ 2901 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2902 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2903 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2904 build.hdr_len = 24; 2905 break; 2906 } 2907 2908 if (sdata->u.mgd.use_4addr) { 2909 /* non-regular ethertype cannot use the fastpath */ 2910 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2911 IEEE80211_FCTL_TODS); 2912 /* RA TA DA SA */ 2913 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2914 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2915 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2916 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2917 build.hdr_len = 30; 2918 break; 2919 } 2920 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2921 /* BSSID SA DA */ 2922 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2923 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2924 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2925 build.hdr_len = 24; 2926 break; 2927 case NL80211_IFTYPE_AP_VLAN: 2928 if (sdata->wdev.use_4addr) { 2929 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2930 IEEE80211_FCTL_TODS); 2931 /* RA TA DA SA */ 2932 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2933 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2934 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2935 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2936 build.hdr_len = 30; 2937 break; 2938 } 2939 /* fall through */ 2940 case NL80211_IFTYPE_AP: 2941 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2942 /* DA BSSID SA */ 2943 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2944 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2945 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2946 build.hdr_len = 24; 2947 break; 2948 default: 2949 /* not handled on fast-xmit */ 2950 goto out; 2951 } 2952 2953 if (sta->sta.wme) { 2954 build.hdr_len += 2; 2955 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2956 } 2957 2958 /* We store the key here so there's no point in using rcu_dereference() 2959 * but that's fine because the code that changes the pointers will call 2960 * this function after doing so. For a single CPU that would be enough, 2961 * for multiple see the comment above. 2962 */ 2963 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2964 if (!build.key) 2965 build.key = rcu_access_pointer(sdata->default_unicast_key); 2966 if (build.key) { 2967 bool gen_iv, iv_spc, mmic; 2968 2969 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2970 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2971 mmic = build.key->conf.flags & 2972 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 2973 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 2974 2975 /* don't handle software crypto */ 2976 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2977 goto out; 2978 2979 /* Key is being removed */ 2980 if (build.key->flags & KEY_FLAG_TAINTED) 2981 goto out; 2982 2983 switch (build.key->conf.cipher) { 2984 case WLAN_CIPHER_SUITE_CCMP: 2985 case WLAN_CIPHER_SUITE_CCMP_256: 2986 /* add fixed key ID */ 2987 if (gen_iv) { 2988 (build.hdr + build.hdr_len)[3] = 2989 0x20 | (build.key->conf.keyidx << 6); 2990 build.pn_offs = build.hdr_len; 2991 } 2992 if (gen_iv || iv_spc) 2993 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2994 break; 2995 case WLAN_CIPHER_SUITE_GCMP: 2996 case WLAN_CIPHER_SUITE_GCMP_256: 2997 /* add fixed key ID */ 2998 if (gen_iv) { 2999 (build.hdr + build.hdr_len)[3] = 3000 0x20 | (build.key->conf.keyidx << 6); 3001 build.pn_offs = build.hdr_len; 3002 } 3003 if (gen_iv || iv_spc) 3004 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3005 break; 3006 case WLAN_CIPHER_SUITE_TKIP: 3007 /* cannot handle MMIC or IV generation in xmit-fast */ 3008 if (mmic || gen_iv) 3009 goto out; 3010 if (iv_spc) 3011 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3012 break; 3013 case WLAN_CIPHER_SUITE_WEP40: 3014 case WLAN_CIPHER_SUITE_WEP104: 3015 /* cannot handle IV generation in fast-xmit */ 3016 if (gen_iv) 3017 goto out; 3018 if (iv_spc) 3019 build.hdr_len += IEEE80211_WEP_IV_LEN; 3020 break; 3021 case WLAN_CIPHER_SUITE_AES_CMAC: 3022 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3023 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3024 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3025 WARN(1, 3026 "management cipher suite 0x%x enabled for data\n", 3027 build.key->conf.cipher); 3028 goto out; 3029 default: 3030 /* we don't know how to generate IVs for this at all */ 3031 if (WARN_ON(gen_iv)) 3032 goto out; 3033 /* pure hardware keys are OK, of course */ 3034 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3035 break; 3036 /* cipher scheme might require space allocation */ 3037 if (iv_spc && 3038 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3039 goto out; 3040 if (iv_spc) 3041 build.hdr_len += build.key->conf.iv_len; 3042 } 3043 3044 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3045 } 3046 3047 hdr->frame_control = fc; 3048 3049 memcpy(build.hdr + build.hdr_len, 3050 rfc1042_header, sizeof(rfc1042_header)); 3051 build.hdr_len += sizeof(rfc1042_header); 3052 3053 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3054 /* if the kmemdup fails, continue w/o fast_tx */ 3055 if (!fast_tx) 3056 goto out; 3057 3058 out: 3059 /* we might have raced against another call to this function */ 3060 old = rcu_dereference_protected(sta->fast_tx, 3061 lockdep_is_held(&sta->lock)); 3062 rcu_assign_pointer(sta->fast_tx, fast_tx); 3063 if (old) 3064 kfree_rcu(old, rcu_head); 3065 spin_unlock_bh(&sta->lock); 3066 } 3067 3068 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3069 { 3070 struct sta_info *sta; 3071 3072 rcu_read_lock(); 3073 list_for_each_entry_rcu(sta, &local->sta_list, list) 3074 ieee80211_check_fast_xmit(sta); 3075 rcu_read_unlock(); 3076 } 3077 3078 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3079 { 3080 struct ieee80211_local *local = sdata->local; 3081 struct sta_info *sta; 3082 3083 rcu_read_lock(); 3084 3085 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3086 if (sdata != sta->sdata && 3087 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3088 continue; 3089 ieee80211_check_fast_xmit(sta); 3090 } 3091 3092 rcu_read_unlock(); 3093 } 3094 3095 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3096 { 3097 struct ieee80211_fast_tx *fast_tx; 3098 3099 spin_lock_bh(&sta->lock); 3100 fast_tx = rcu_dereference_protected(sta->fast_tx, 3101 lockdep_is_held(&sta->lock)); 3102 RCU_INIT_POINTER(sta->fast_tx, NULL); 3103 spin_unlock_bh(&sta->lock); 3104 3105 if (fast_tx) 3106 kfree_rcu(fast_tx, rcu_head); 3107 } 3108 3109 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3110 struct sk_buff *skb, int headroom) 3111 { 3112 if (skb_headroom(skb) < headroom) { 3113 I802_DEBUG_INC(local->tx_expand_skb_head); 3114 3115 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3116 wiphy_debug(local->hw.wiphy, 3117 "failed to reallocate TX buffer\n"); 3118 return false; 3119 } 3120 } 3121 3122 return true; 3123 } 3124 3125 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3126 struct ieee80211_fast_tx *fast_tx, 3127 struct sk_buff *skb) 3128 { 3129 struct ieee80211_local *local = sdata->local; 3130 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3131 struct ieee80211_hdr *hdr; 3132 struct ethhdr *amsdu_hdr; 3133 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3134 int subframe_len = skb->len - hdr_len; 3135 void *data; 3136 u8 *qc, *h_80211_src, *h_80211_dst; 3137 const u8 *bssid; 3138 3139 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3140 return false; 3141 3142 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3143 return true; 3144 3145 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3146 return false; 3147 3148 data = skb_push(skb, sizeof(*amsdu_hdr)); 3149 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3150 hdr = data; 3151 amsdu_hdr = data + hdr_len; 3152 /* h_80211_src/dst is addr* field within hdr */ 3153 h_80211_src = data + fast_tx->sa_offs; 3154 h_80211_dst = data + fast_tx->da_offs; 3155 3156 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3157 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3158 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3159 3160 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3161 * fields needs to be changed to BSSID for A-MSDU frames depending 3162 * on FromDS/ToDS values. 3163 */ 3164 switch (sdata->vif.type) { 3165 case NL80211_IFTYPE_STATION: 3166 bssid = sdata->u.mgd.bssid; 3167 break; 3168 case NL80211_IFTYPE_AP: 3169 case NL80211_IFTYPE_AP_VLAN: 3170 bssid = sdata->vif.addr; 3171 break; 3172 default: 3173 bssid = NULL; 3174 } 3175 3176 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3177 ether_addr_copy(h_80211_src, bssid); 3178 3179 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3180 ether_addr_copy(h_80211_dst, bssid); 3181 3182 qc = ieee80211_get_qos_ctl(hdr); 3183 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3184 3185 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3186 3187 return true; 3188 } 3189 3190 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3191 struct sta_info *sta, 3192 struct ieee80211_fast_tx *fast_tx, 3193 struct sk_buff *skb) 3194 { 3195 struct ieee80211_local *local = sdata->local; 3196 struct fq *fq = &local->fq; 3197 struct fq_tin *tin; 3198 struct fq_flow *flow; 3199 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3200 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3201 struct txq_info *txqi; 3202 struct sk_buff **frag_tail, *head; 3203 int subframe_len = skb->len - ETH_ALEN; 3204 u8 max_subframes = sta->sta.max_amsdu_subframes; 3205 int max_frags = local->hw.max_tx_fragments; 3206 int max_amsdu_len = sta->sta.max_amsdu_len; 3207 __be16 len; 3208 void *data; 3209 bool ret = false; 3210 unsigned int orig_len; 3211 int n = 2, nfrags, pad = 0; 3212 u16 hdrlen; 3213 3214 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3215 return false; 3216 3217 if (!txq) 3218 return false; 3219 3220 txqi = to_txq_info(txq); 3221 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3222 return false; 3223 3224 if (sta->sta.max_rc_amsdu_len) 3225 max_amsdu_len = min_t(int, max_amsdu_len, 3226 sta->sta.max_rc_amsdu_len); 3227 3228 if (sta->sta.max_tid_amsdu_len[tid]) 3229 max_amsdu_len = min_t(int, max_amsdu_len, 3230 sta->sta.max_tid_amsdu_len[tid]); 3231 3232 spin_lock_bh(&fq->lock); 3233 3234 /* TODO: Ideally aggregation should be done on dequeue to remain 3235 * responsive to environment changes. 3236 */ 3237 3238 tin = &txqi->tin; 3239 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3240 head = skb_peek_tail(&flow->queue); 3241 if (!head) 3242 goto out; 3243 3244 orig_len = head->len; 3245 3246 if (skb->len + head->len > max_amsdu_len) 3247 goto out; 3248 3249 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3250 nfrags += 1 + skb_shinfo(head)->nr_frags; 3251 frag_tail = &skb_shinfo(head)->frag_list; 3252 while (*frag_tail) { 3253 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3254 frag_tail = &(*frag_tail)->next; 3255 n++; 3256 } 3257 3258 if (max_subframes && n > max_subframes) 3259 goto out; 3260 3261 if (max_frags && nfrags > max_frags) 3262 goto out; 3263 3264 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3265 goto out; 3266 3267 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3268 goto out; 3269 3270 /* 3271 * Pad out the previous subframe to a multiple of 4 by adding the 3272 * padding to the next one, that's being added. Note that head->len 3273 * is the length of the full A-MSDU, but that works since each time 3274 * we add a new subframe we pad out the previous one to a multiple 3275 * of 4 and thus it no longer matters in the next round. 3276 */ 3277 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3278 if ((head->len - hdrlen) & 3) 3279 pad = 4 - ((head->len - hdrlen) & 3); 3280 3281 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3282 2 + pad)) 3283 goto out_recalc; 3284 3285 ret = true; 3286 data = skb_push(skb, ETH_ALEN + 2); 3287 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3288 3289 data += 2 * ETH_ALEN; 3290 len = cpu_to_be16(subframe_len); 3291 memcpy(data, &len, 2); 3292 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3293 3294 memset(skb_push(skb, pad), 0, pad); 3295 3296 head->len += skb->len; 3297 head->data_len += skb->len; 3298 *frag_tail = skb; 3299 3300 out_recalc: 3301 if (head->len != orig_len) { 3302 flow->backlog += head->len - orig_len; 3303 tin->backlog_bytes += head->len - orig_len; 3304 3305 fq_recalc_backlog(fq, tin, flow); 3306 } 3307 out: 3308 spin_unlock_bh(&fq->lock); 3309 3310 return ret; 3311 } 3312 3313 /* 3314 * Can be called while the sta lock is held. Anything that can cause packets to 3315 * be generated will cause deadlock! 3316 */ 3317 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3318 struct sta_info *sta, u8 pn_offs, 3319 struct ieee80211_key *key, 3320 struct sk_buff *skb) 3321 { 3322 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3323 struct ieee80211_hdr *hdr = (void *)skb->data; 3324 u8 tid = IEEE80211_NUM_TIDS; 3325 3326 if (key) 3327 info->control.hw_key = &key->conf; 3328 3329 ieee80211_tx_stats(skb->dev, skb->len); 3330 3331 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3332 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3333 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3334 } else { 3335 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3336 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3337 sdata->sequence_number += 0x10; 3338 } 3339 3340 if (skb_shinfo(skb)->gso_size) 3341 sta->tx_stats.msdu[tid] += 3342 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3343 else 3344 sta->tx_stats.msdu[tid]++; 3345 3346 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3347 3348 /* statistics normally done by ieee80211_tx_h_stats (but that 3349 * has to consider fragmentation, so is more complex) 3350 */ 3351 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3352 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3353 3354 if (pn_offs) { 3355 u64 pn; 3356 u8 *crypto_hdr = skb->data + pn_offs; 3357 3358 switch (key->conf.cipher) { 3359 case WLAN_CIPHER_SUITE_CCMP: 3360 case WLAN_CIPHER_SUITE_CCMP_256: 3361 case WLAN_CIPHER_SUITE_GCMP: 3362 case WLAN_CIPHER_SUITE_GCMP_256: 3363 pn = atomic64_inc_return(&key->conf.tx_pn); 3364 crypto_hdr[0] = pn; 3365 crypto_hdr[1] = pn >> 8; 3366 crypto_hdr[4] = pn >> 16; 3367 crypto_hdr[5] = pn >> 24; 3368 crypto_hdr[6] = pn >> 32; 3369 crypto_hdr[7] = pn >> 40; 3370 break; 3371 } 3372 } 3373 } 3374 3375 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3376 struct sta_info *sta, 3377 struct ieee80211_fast_tx *fast_tx, 3378 struct sk_buff *skb) 3379 { 3380 struct ieee80211_local *local = sdata->local; 3381 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3382 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3383 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3384 struct ethhdr eth; 3385 struct ieee80211_tx_info *info; 3386 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3387 struct ieee80211_tx_data tx; 3388 ieee80211_tx_result r; 3389 struct tid_ampdu_tx *tid_tx = NULL; 3390 u8 tid = IEEE80211_NUM_TIDS; 3391 3392 /* control port protocol needs a lot of special handling */ 3393 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3394 return false; 3395 3396 /* only RFC 1042 SNAP */ 3397 if (ethertype < ETH_P_802_3_MIN) 3398 return false; 3399 3400 /* don't handle TX status request here either */ 3401 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3402 return false; 3403 3404 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3405 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3406 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3407 if (tid_tx) { 3408 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3409 return false; 3410 if (tid_tx->timeout) 3411 tid_tx->last_tx = jiffies; 3412 } 3413 } 3414 3415 /* after this point (skb is modified) we cannot return false */ 3416 3417 if (skb_shared(skb)) { 3418 struct sk_buff *tmp_skb = skb; 3419 3420 skb = skb_clone(skb, GFP_ATOMIC); 3421 kfree_skb(tmp_skb); 3422 3423 if (!skb) 3424 return true; 3425 } 3426 3427 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3428 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3429 return true; 3430 3431 /* will not be crypto-handled beyond what we do here, so use false 3432 * as the may-encrypt argument for the resize to not account for 3433 * more room than we already have in 'extra_head' 3434 */ 3435 if (unlikely(ieee80211_skb_resize(sdata, skb, 3436 max_t(int, extra_head + hw_headroom - 3437 skb_headroom(skb), 0), 3438 false))) { 3439 kfree_skb(skb); 3440 return true; 3441 } 3442 3443 memcpy(ð, skb->data, ETH_HLEN - 2); 3444 hdr = skb_push(skb, extra_head); 3445 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3446 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3447 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3448 3449 info = IEEE80211_SKB_CB(skb); 3450 memset(info, 0, sizeof(*info)); 3451 info->band = fast_tx->band; 3452 info->control.vif = &sdata->vif; 3453 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3454 IEEE80211_TX_CTL_DONTFRAG | 3455 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3456 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3457 3458 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3459 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3460 *ieee80211_get_qos_ctl(hdr) = tid; 3461 } 3462 3463 __skb_queue_head_init(&tx.skbs); 3464 3465 tx.flags = IEEE80211_TX_UNICAST; 3466 tx.local = local; 3467 tx.sdata = sdata; 3468 tx.sta = sta; 3469 tx.key = fast_tx->key; 3470 3471 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3472 tx.skb = skb; 3473 r = ieee80211_tx_h_rate_ctrl(&tx); 3474 skb = tx.skb; 3475 tx.skb = NULL; 3476 3477 if (r != TX_CONTINUE) { 3478 if (r != TX_QUEUED) 3479 kfree_skb(skb); 3480 return true; 3481 } 3482 } 3483 3484 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3485 return true; 3486 3487 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3488 fast_tx->key, skb); 3489 3490 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3491 sdata = container_of(sdata->bss, 3492 struct ieee80211_sub_if_data, u.ap); 3493 3494 __skb_queue_tail(&tx.skbs, skb); 3495 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3496 return true; 3497 } 3498 3499 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3500 struct ieee80211_txq *txq) 3501 { 3502 struct ieee80211_local *local = hw_to_local(hw); 3503 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3504 struct ieee80211_hdr *hdr; 3505 struct sk_buff *skb = NULL; 3506 struct fq *fq = &local->fq; 3507 struct fq_tin *tin = &txqi->tin; 3508 struct ieee80211_tx_info *info; 3509 struct ieee80211_tx_data tx; 3510 ieee80211_tx_result r; 3511 struct ieee80211_vif *vif = txq->vif; 3512 3513 spin_lock_bh(&fq->lock); 3514 3515 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3516 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3517 goto out; 3518 3519 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3520 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3521 goto out; 3522 } 3523 3524 /* Make sure fragments stay together. */ 3525 skb = __skb_dequeue(&txqi->frags); 3526 if (skb) 3527 goto out; 3528 3529 begin: 3530 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3531 if (!skb) 3532 goto out; 3533 3534 hdr = (struct ieee80211_hdr *)skb->data; 3535 info = IEEE80211_SKB_CB(skb); 3536 3537 memset(&tx, 0, sizeof(tx)); 3538 __skb_queue_head_init(&tx.skbs); 3539 tx.local = local; 3540 tx.skb = skb; 3541 tx.sdata = vif_to_sdata(info->control.vif); 3542 3543 if (txq->sta) 3544 tx.sta = container_of(txq->sta, struct sta_info, sta); 3545 3546 /* 3547 * The key can be removed while the packet was queued, so need to call 3548 * this here to get the current key. 3549 */ 3550 r = ieee80211_tx_h_select_key(&tx); 3551 if (r != TX_CONTINUE) { 3552 ieee80211_free_txskb(&local->hw, skb); 3553 goto begin; 3554 } 3555 3556 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3557 info->flags |= IEEE80211_TX_CTL_AMPDU; 3558 else 3559 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3560 3561 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3562 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3563 sta); 3564 u8 pn_offs = 0; 3565 3566 if (tx.key && 3567 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3568 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3569 3570 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3571 tx.key, skb); 3572 } else { 3573 if (invoke_tx_handlers_late(&tx)) 3574 goto begin; 3575 3576 skb = __skb_dequeue(&tx.skbs); 3577 3578 if (!skb_queue_empty(&tx.skbs)) 3579 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3580 } 3581 3582 if (skb && skb_has_frag_list(skb) && 3583 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3584 if (skb_linearize(skb)) { 3585 ieee80211_free_txskb(&local->hw, skb); 3586 goto begin; 3587 } 3588 } 3589 3590 switch (tx.sdata->vif.type) { 3591 case NL80211_IFTYPE_MONITOR: 3592 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3593 vif = &tx.sdata->vif; 3594 break; 3595 } 3596 tx.sdata = rcu_dereference(local->monitor_sdata); 3597 if (tx.sdata) { 3598 vif = &tx.sdata->vif; 3599 info->hw_queue = 3600 vif->hw_queue[skb_get_queue_mapping(skb)]; 3601 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3602 ieee80211_free_txskb(&local->hw, skb); 3603 goto begin; 3604 } else { 3605 vif = NULL; 3606 } 3607 break; 3608 case NL80211_IFTYPE_AP_VLAN: 3609 tx.sdata = container_of(tx.sdata->bss, 3610 struct ieee80211_sub_if_data, u.ap); 3611 /* fall through */ 3612 default: 3613 vif = &tx.sdata->vif; 3614 break; 3615 } 3616 3617 IEEE80211_SKB_CB(skb)->control.vif = vif; 3618 3619 out: 3620 spin_unlock_bh(&fq->lock); 3621 3622 return skb; 3623 } 3624 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3625 3626 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3627 struct net_device *dev, 3628 u32 info_flags) 3629 { 3630 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3631 struct sta_info *sta; 3632 struct sk_buff *next; 3633 3634 if (unlikely(skb->len < ETH_HLEN)) { 3635 kfree_skb(skb); 3636 return; 3637 } 3638 3639 rcu_read_lock(); 3640 3641 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3642 goto out_free; 3643 3644 if (!IS_ERR_OR_NULL(sta)) { 3645 struct ieee80211_fast_tx *fast_tx; 3646 3647 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3648 3649 fast_tx = rcu_dereference(sta->fast_tx); 3650 3651 if (fast_tx && 3652 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3653 goto out; 3654 } 3655 3656 if (skb_is_gso(skb)) { 3657 struct sk_buff *segs; 3658 3659 segs = skb_gso_segment(skb, 0); 3660 if (IS_ERR(segs)) { 3661 goto out_free; 3662 } else if (segs) { 3663 consume_skb(skb); 3664 skb = segs; 3665 } 3666 } else { 3667 /* we cannot process non-linear frames on this path */ 3668 if (skb_linearize(skb)) { 3669 kfree_skb(skb); 3670 goto out; 3671 } 3672 3673 /* the frame could be fragmented, software-encrypted, and other 3674 * things so we cannot really handle checksum offload with it - 3675 * fix it up in software before we handle anything else. 3676 */ 3677 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3678 skb_set_transport_header(skb, 3679 skb_checksum_start_offset(skb)); 3680 if (skb_checksum_help(skb)) 3681 goto out_free; 3682 } 3683 } 3684 3685 next = skb; 3686 while (next) { 3687 skb = next; 3688 next = skb->next; 3689 3690 skb->prev = NULL; 3691 skb->next = NULL; 3692 3693 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3694 if (IS_ERR(skb)) 3695 goto out; 3696 3697 ieee80211_tx_stats(dev, skb->len); 3698 3699 ieee80211_xmit(sdata, sta, skb, 0); 3700 } 3701 goto out; 3702 out_free: 3703 kfree_skb(skb); 3704 out: 3705 rcu_read_unlock(); 3706 } 3707 3708 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3709 { 3710 struct ethhdr *eth; 3711 int err; 3712 3713 err = skb_ensure_writable(skb, ETH_HLEN); 3714 if (unlikely(err)) 3715 return err; 3716 3717 eth = (void *)skb->data; 3718 ether_addr_copy(eth->h_dest, sta->sta.addr); 3719 3720 return 0; 3721 } 3722 3723 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3724 struct net_device *dev) 3725 { 3726 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3727 const struct ethhdr *eth = (void *)skb->data; 3728 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3729 __be16 ethertype; 3730 3731 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3732 return false; 3733 3734 switch (sdata->vif.type) { 3735 case NL80211_IFTYPE_AP_VLAN: 3736 if (sdata->u.vlan.sta) 3737 return false; 3738 if (sdata->wdev.use_4addr) 3739 return false; 3740 /* fall through */ 3741 case NL80211_IFTYPE_AP: 3742 /* check runtime toggle for this bss */ 3743 if (!sdata->bss->multicast_to_unicast) 3744 return false; 3745 break; 3746 default: 3747 return false; 3748 } 3749 3750 /* multicast to unicast conversion only for some payload */ 3751 ethertype = eth->h_proto; 3752 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3753 ethertype = ethvlan->h_vlan_encapsulated_proto; 3754 switch (ethertype) { 3755 case htons(ETH_P_ARP): 3756 case htons(ETH_P_IP): 3757 case htons(ETH_P_IPV6): 3758 break; 3759 default: 3760 return false; 3761 } 3762 3763 return true; 3764 } 3765 3766 static void 3767 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3768 struct sk_buff_head *queue) 3769 { 3770 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3771 struct ieee80211_local *local = sdata->local; 3772 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3773 struct sta_info *sta, *first = NULL; 3774 struct sk_buff *cloned_skb; 3775 3776 rcu_read_lock(); 3777 3778 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3779 if (sdata != sta->sdata) 3780 /* AP-VLAN mismatch */ 3781 continue; 3782 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3783 /* do not send back to source */ 3784 continue; 3785 if (!first) { 3786 first = sta; 3787 continue; 3788 } 3789 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3790 if (!cloned_skb) 3791 goto multicast; 3792 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3793 dev_kfree_skb(cloned_skb); 3794 goto multicast; 3795 } 3796 __skb_queue_tail(queue, cloned_skb); 3797 } 3798 3799 if (likely(first)) { 3800 if (unlikely(ieee80211_change_da(skb, first))) 3801 goto multicast; 3802 __skb_queue_tail(queue, skb); 3803 } else { 3804 /* no STA connected, drop */ 3805 kfree_skb(skb); 3806 skb = NULL; 3807 } 3808 3809 goto out; 3810 multicast: 3811 __skb_queue_purge(queue); 3812 __skb_queue_tail(queue, skb); 3813 out: 3814 rcu_read_unlock(); 3815 } 3816 3817 /** 3818 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3819 * @skb: packet to be sent 3820 * @dev: incoming interface 3821 * 3822 * On failure skb will be freed. 3823 */ 3824 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3825 struct net_device *dev) 3826 { 3827 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 3828 struct sk_buff_head queue; 3829 3830 __skb_queue_head_init(&queue); 3831 ieee80211_convert_to_unicast(skb, dev, &queue); 3832 while ((skb = __skb_dequeue(&queue))) 3833 __ieee80211_subif_start_xmit(skb, dev, 0); 3834 } else { 3835 __ieee80211_subif_start_xmit(skb, dev, 0); 3836 } 3837 3838 return NETDEV_TX_OK; 3839 } 3840 3841 struct sk_buff * 3842 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3843 struct sk_buff *skb, u32 info_flags) 3844 { 3845 struct ieee80211_hdr *hdr; 3846 struct ieee80211_tx_data tx = { 3847 .local = sdata->local, 3848 .sdata = sdata, 3849 }; 3850 struct sta_info *sta; 3851 3852 rcu_read_lock(); 3853 3854 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3855 kfree_skb(skb); 3856 skb = ERR_PTR(-EINVAL); 3857 goto out; 3858 } 3859 3860 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3861 if (IS_ERR(skb)) 3862 goto out; 3863 3864 hdr = (void *)skb->data; 3865 tx.sta = sta_info_get(sdata, hdr->addr1); 3866 tx.skb = skb; 3867 3868 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3869 rcu_read_unlock(); 3870 kfree_skb(skb); 3871 return ERR_PTR(-EINVAL); 3872 } 3873 3874 out: 3875 rcu_read_unlock(); 3876 return skb; 3877 } 3878 3879 /* 3880 * ieee80211_clear_tx_pending may not be called in a context where 3881 * it is possible that it packets could come in again. 3882 */ 3883 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3884 { 3885 struct sk_buff *skb; 3886 int i; 3887 3888 for (i = 0; i < local->hw.queues; i++) { 3889 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3890 ieee80211_free_txskb(&local->hw, skb); 3891 } 3892 } 3893 3894 /* 3895 * Returns false if the frame couldn't be transmitted but was queued instead, 3896 * which in this case means re-queued -- take as an indication to stop sending 3897 * more pending frames. 3898 */ 3899 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3900 struct sk_buff *skb) 3901 { 3902 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3903 struct ieee80211_sub_if_data *sdata; 3904 struct sta_info *sta; 3905 struct ieee80211_hdr *hdr; 3906 bool result; 3907 struct ieee80211_chanctx_conf *chanctx_conf; 3908 3909 sdata = vif_to_sdata(info->control.vif); 3910 3911 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3912 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3913 if (unlikely(!chanctx_conf)) { 3914 dev_kfree_skb(skb); 3915 return true; 3916 } 3917 info->band = chanctx_conf->def.chan->band; 3918 result = ieee80211_tx(sdata, NULL, skb, true, 0); 3919 } else { 3920 struct sk_buff_head skbs; 3921 3922 __skb_queue_head_init(&skbs); 3923 __skb_queue_tail(&skbs, skb); 3924 3925 hdr = (struct ieee80211_hdr *)skb->data; 3926 sta = sta_info_get(sdata, hdr->addr1); 3927 3928 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3929 } 3930 3931 return result; 3932 } 3933 3934 /* 3935 * Transmit all pending packets. Called from tasklet. 3936 */ 3937 void ieee80211_tx_pending(unsigned long data) 3938 { 3939 struct ieee80211_local *local = (struct ieee80211_local *)data; 3940 unsigned long flags; 3941 int i; 3942 bool txok; 3943 3944 rcu_read_lock(); 3945 3946 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3947 for (i = 0; i < local->hw.queues; i++) { 3948 /* 3949 * If queue is stopped by something other than due to pending 3950 * frames, or we have no pending frames, proceed to next queue. 3951 */ 3952 if (local->queue_stop_reasons[i] || 3953 skb_queue_empty(&local->pending[i])) 3954 continue; 3955 3956 while (!skb_queue_empty(&local->pending[i])) { 3957 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3958 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3959 3960 if (WARN_ON(!info->control.vif)) { 3961 ieee80211_free_txskb(&local->hw, skb); 3962 continue; 3963 } 3964 3965 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3966 flags); 3967 3968 txok = ieee80211_tx_pending_skb(local, skb); 3969 spin_lock_irqsave(&local->queue_stop_reason_lock, 3970 flags); 3971 if (!txok) 3972 break; 3973 } 3974 3975 if (skb_queue_empty(&local->pending[i])) 3976 ieee80211_propagate_queue_wake(local, i); 3977 } 3978 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3979 3980 rcu_read_unlock(); 3981 } 3982 3983 /* functions for drivers to get certain frames */ 3984 3985 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3986 struct ps_data *ps, struct sk_buff *skb, 3987 bool is_template) 3988 { 3989 u8 *pos, *tim; 3990 int aid0 = 0; 3991 int i, have_bits = 0, n1, n2; 3992 3993 /* Generate bitmap for TIM only if there are any STAs in power save 3994 * mode. */ 3995 if (atomic_read(&ps->num_sta_ps) > 0) 3996 /* in the hope that this is faster than 3997 * checking byte-for-byte */ 3998 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3999 IEEE80211_MAX_AID+1); 4000 if (!is_template) { 4001 if (ps->dtim_count == 0) 4002 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4003 else 4004 ps->dtim_count--; 4005 } 4006 4007 tim = pos = skb_put(skb, 6); 4008 *pos++ = WLAN_EID_TIM; 4009 *pos++ = 4; 4010 *pos++ = ps->dtim_count; 4011 *pos++ = sdata->vif.bss_conf.dtim_period; 4012 4013 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4014 aid0 = 1; 4015 4016 ps->dtim_bc_mc = aid0 == 1; 4017 4018 if (have_bits) { 4019 /* Find largest even number N1 so that bits numbered 1 through 4020 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4021 * (N2 + 1) x 8 through 2007 are 0. */ 4022 n1 = 0; 4023 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4024 if (ps->tim[i]) { 4025 n1 = i & 0xfe; 4026 break; 4027 } 4028 } 4029 n2 = n1; 4030 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4031 if (ps->tim[i]) { 4032 n2 = i; 4033 break; 4034 } 4035 } 4036 4037 /* Bitmap control */ 4038 *pos++ = n1 | aid0; 4039 /* Part Virt Bitmap */ 4040 skb_put(skb, n2 - n1); 4041 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4042 4043 tim[1] = n2 - n1 + 4; 4044 } else { 4045 *pos++ = aid0; /* Bitmap control */ 4046 *pos++ = 0; /* Part Virt Bitmap */ 4047 } 4048 } 4049 4050 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4051 struct ps_data *ps, struct sk_buff *skb, 4052 bool is_template) 4053 { 4054 struct ieee80211_local *local = sdata->local; 4055 4056 /* 4057 * Not very nice, but we want to allow the driver to call 4058 * ieee80211_beacon_get() as a response to the set_tim() 4059 * callback. That, however, is already invoked under the 4060 * sta_lock to guarantee consistent and race-free update 4061 * of the tim bitmap in mac80211 and the driver. 4062 */ 4063 if (local->tim_in_locked_section) { 4064 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4065 } else { 4066 spin_lock_bh(&local->tim_lock); 4067 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4068 spin_unlock_bh(&local->tim_lock); 4069 } 4070 4071 return 0; 4072 } 4073 4074 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4075 struct beacon_data *beacon) 4076 { 4077 struct probe_resp *resp; 4078 u8 *beacon_data; 4079 size_t beacon_data_len; 4080 int i; 4081 u8 count = beacon->csa_current_counter; 4082 4083 switch (sdata->vif.type) { 4084 case NL80211_IFTYPE_AP: 4085 beacon_data = beacon->tail; 4086 beacon_data_len = beacon->tail_len; 4087 break; 4088 case NL80211_IFTYPE_ADHOC: 4089 beacon_data = beacon->head; 4090 beacon_data_len = beacon->head_len; 4091 break; 4092 case NL80211_IFTYPE_MESH_POINT: 4093 beacon_data = beacon->head; 4094 beacon_data_len = beacon->head_len; 4095 break; 4096 default: 4097 return; 4098 } 4099 4100 rcu_read_lock(); 4101 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4102 resp = rcu_dereference(sdata->u.ap.probe_resp); 4103 4104 if (beacon->csa_counter_offsets[i]) { 4105 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4106 beacon_data_len)) { 4107 rcu_read_unlock(); 4108 return; 4109 } 4110 4111 beacon_data[beacon->csa_counter_offsets[i]] = count; 4112 } 4113 4114 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4115 resp->data[resp->csa_counter_offsets[i]] = count; 4116 } 4117 rcu_read_unlock(); 4118 } 4119 4120 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4121 { 4122 beacon->csa_current_counter--; 4123 4124 /* the counter should never reach 0 */ 4125 WARN_ON_ONCE(!beacon->csa_current_counter); 4126 4127 return beacon->csa_current_counter; 4128 } 4129 4130 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4131 { 4132 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4133 struct beacon_data *beacon = NULL; 4134 u8 count = 0; 4135 4136 rcu_read_lock(); 4137 4138 if (sdata->vif.type == NL80211_IFTYPE_AP) 4139 beacon = rcu_dereference(sdata->u.ap.beacon); 4140 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4141 beacon = rcu_dereference(sdata->u.ibss.presp); 4142 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4143 beacon = rcu_dereference(sdata->u.mesh.beacon); 4144 4145 if (!beacon) 4146 goto unlock; 4147 4148 count = __ieee80211_csa_update_counter(beacon); 4149 4150 unlock: 4151 rcu_read_unlock(); 4152 return count; 4153 } 4154 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4155 4156 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4157 { 4158 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4159 struct beacon_data *beacon = NULL; 4160 4161 rcu_read_lock(); 4162 4163 if (sdata->vif.type == NL80211_IFTYPE_AP) 4164 beacon = rcu_dereference(sdata->u.ap.beacon); 4165 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4166 beacon = rcu_dereference(sdata->u.ibss.presp); 4167 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4168 beacon = rcu_dereference(sdata->u.mesh.beacon); 4169 4170 if (!beacon) 4171 goto unlock; 4172 4173 if (counter < beacon->csa_current_counter) 4174 beacon->csa_current_counter = counter; 4175 4176 unlock: 4177 rcu_read_unlock(); 4178 } 4179 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4180 4181 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4182 { 4183 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4184 struct beacon_data *beacon = NULL; 4185 u8 *beacon_data; 4186 size_t beacon_data_len; 4187 int ret = false; 4188 4189 if (!ieee80211_sdata_running(sdata)) 4190 return false; 4191 4192 rcu_read_lock(); 4193 if (vif->type == NL80211_IFTYPE_AP) { 4194 struct ieee80211_if_ap *ap = &sdata->u.ap; 4195 4196 beacon = rcu_dereference(ap->beacon); 4197 if (WARN_ON(!beacon || !beacon->tail)) 4198 goto out; 4199 beacon_data = beacon->tail; 4200 beacon_data_len = beacon->tail_len; 4201 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4202 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4203 4204 beacon = rcu_dereference(ifibss->presp); 4205 if (!beacon) 4206 goto out; 4207 4208 beacon_data = beacon->head; 4209 beacon_data_len = beacon->head_len; 4210 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4211 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4212 4213 beacon = rcu_dereference(ifmsh->beacon); 4214 if (!beacon) 4215 goto out; 4216 4217 beacon_data = beacon->head; 4218 beacon_data_len = beacon->head_len; 4219 } else { 4220 WARN_ON(1); 4221 goto out; 4222 } 4223 4224 if (!beacon->csa_counter_offsets[0]) 4225 goto out; 4226 4227 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4228 goto out; 4229 4230 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4231 ret = true; 4232 out: 4233 rcu_read_unlock(); 4234 4235 return ret; 4236 } 4237 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4238 4239 static struct sk_buff * 4240 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4241 struct ieee80211_vif *vif, 4242 struct ieee80211_mutable_offsets *offs, 4243 bool is_template) 4244 { 4245 struct ieee80211_local *local = hw_to_local(hw); 4246 struct beacon_data *beacon = NULL; 4247 struct sk_buff *skb = NULL; 4248 struct ieee80211_tx_info *info; 4249 struct ieee80211_sub_if_data *sdata = NULL; 4250 enum nl80211_band band; 4251 struct ieee80211_tx_rate_control txrc; 4252 struct ieee80211_chanctx_conf *chanctx_conf; 4253 int csa_off_base = 0; 4254 4255 rcu_read_lock(); 4256 4257 sdata = vif_to_sdata(vif); 4258 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4259 4260 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4261 goto out; 4262 4263 if (offs) 4264 memset(offs, 0, sizeof(*offs)); 4265 4266 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4267 struct ieee80211_if_ap *ap = &sdata->u.ap; 4268 4269 beacon = rcu_dereference(ap->beacon); 4270 if (beacon) { 4271 if (beacon->csa_counter_offsets[0]) { 4272 if (!is_template) 4273 __ieee80211_csa_update_counter(beacon); 4274 4275 ieee80211_set_csa(sdata, beacon); 4276 } 4277 4278 /* 4279 * headroom, head length, 4280 * tail length and maximum TIM length 4281 */ 4282 skb = dev_alloc_skb(local->tx_headroom + 4283 beacon->head_len + 4284 beacon->tail_len + 256 + 4285 local->hw.extra_beacon_tailroom); 4286 if (!skb) 4287 goto out; 4288 4289 skb_reserve(skb, local->tx_headroom); 4290 skb_put_data(skb, beacon->head, beacon->head_len); 4291 4292 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4293 is_template); 4294 4295 if (offs) { 4296 offs->tim_offset = beacon->head_len; 4297 offs->tim_length = skb->len - beacon->head_len; 4298 4299 /* for AP the csa offsets are from tail */ 4300 csa_off_base = skb->len; 4301 } 4302 4303 if (beacon->tail) 4304 skb_put_data(skb, beacon->tail, 4305 beacon->tail_len); 4306 } else 4307 goto out; 4308 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4309 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4310 struct ieee80211_hdr *hdr; 4311 4312 beacon = rcu_dereference(ifibss->presp); 4313 if (!beacon) 4314 goto out; 4315 4316 if (beacon->csa_counter_offsets[0]) { 4317 if (!is_template) 4318 __ieee80211_csa_update_counter(beacon); 4319 4320 ieee80211_set_csa(sdata, beacon); 4321 } 4322 4323 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4324 local->hw.extra_beacon_tailroom); 4325 if (!skb) 4326 goto out; 4327 skb_reserve(skb, local->tx_headroom); 4328 skb_put_data(skb, beacon->head, beacon->head_len); 4329 4330 hdr = (struct ieee80211_hdr *) skb->data; 4331 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4332 IEEE80211_STYPE_BEACON); 4333 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4334 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4335 4336 beacon = rcu_dereference(ifmsh->beacon); 4337 if (!beacon) 4338 goto out; 4339 4340 if (beacon->csa_counter_offsets[0]) { 4341 if (!is_template) 4342 /* TODO: For mesh csa_counter is in TU, so 4343 * decrementing it by one isn't correct, but 4344 * for now we leave it consistent with overall 4345 * mac80211's behavior. 4346 */ 4347 __ieee80211_csa_update_counter(beacon); 4348 4349 ieee80211_set_csa(sdata, beacon); 4350 } 4351 4352 if (ifmsh->sync_ops) 4353 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4354 4355 skb = dev_alloc_skb(local->tx_headroom + 4356 beacon->head_len + 4357 256 + /* TIM IE */ 4358 beacon->tail_len + 4359 local->hw.extra_beacon_tailroom); 4360 if (!skb) 4361 goto out; 4362 skb_reserve(skb, local->tx_headroom); 4363 skb_put_data(skb, beacon->head, beacon->head_len); 4364 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4365 4366 if (offs) { 4367 offs->tim_offset = beacon->head_len; 4368 offs->tim_length = skb->len - beacon->head_len; 4369 } 4370 4371 skb_put_data(skb, beacon->tail, beacon->tail_len); 4372 } else { 4373 WARN_ON(1); 4374 goto out; 4375 } 4376 4377 /* CSA offsets */ 4378 if (offs && beacon) { 4379 int i; 4380 4381 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4382 u16 csa_off = beacon->csa_counter_offsets[i]; 4383 4384 if (!csa_off) 4385 continue; 4386 4387 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4388 } 4389 } 4390 4391 band = chanctx_conf->def.chan->band; 4392 4393 info = IEEE80211_SKB_CB(skb); 4394 4395 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4396 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4397 info->band = band; 4398 4399 memset(&txrc, 0, sizeof(txrc)); 4400 txrc.hw = hw; 4401 txrc.sband = local->hw.wiphy->bands[band]; 4402 txrc.bss_conf = &sdata->vif.bss_conf; 4403 txrc.skb = skb; 4404 txrc.reported_rate.idx = -1; 4405 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4406 txrc.bss = true; 4407 rate_control_get_rate(sdata, NULL, &txrc); 4408 4409 info->control.vif = vif; 4410 4411 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4412 IEEE80211_TX_CTL_ASSIGN_SEQ | 4413 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4414 out: 4415 rcu_read_unlock(); 4416 return skb; 4417 4418 } 4419 4420 struct sk_buff * 4421 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4422 struct ieee80211_vif *vif, 4423 struct ieee80211_mutable_offsets *offs) 4424 { 4425 return __ieee80211_beacon_get(hw, vif, offs, true); 4426 } 4427 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4428 4429 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4430 struct ieee80211_vif *vif, 4431 u16 *tim_offset, u16 *tim_length) 4432 { 4433 struct ieee80211_mutable_offsets offs = {}; 4434 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4435 struct sk_buff *copy; 4436 struct ieee80211_supported_band *sband; 4437 int shift; 4438 4439 if (!bcn) 4440 return bcn; 4441 4442 if (tim_offset) 4443 *tim_offset = offs.tim_offset; 4444 4445 if (tim_length) 4446 *tim_length = offs.tim_length; 4447 4448 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4449 !hw_to_local(hw)->monitors) 4450 return bcn; 4451 4452 /* send a copy to monitor interfaces */ 4453 copy = skb_copy(bcn, GFP_ATOMIC); 4454 if (!copy) 4455 return bcn; 4456 4457 shift = ieee80211_vif_get_shift(vif); 4458 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4459 if (!sband) 4460 return bcn; 4461 4462 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4463 4464 return bcn; 4465 } 4466 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4467 4468 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4469 struct ieee80211_vif *vif) 4470 { 4471 struct ieee80211_if_ap *ap = NULL; 4472 struct sk_buff *skb = NULL; 4473 struct probe_resp *presp = NULL; 4474 struct ieee80211_hdr *hdr; 4475 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4476 4477 if (sdata->vif.type != NL80211_IFTYPE_AP) 4478 return NULL; 4479 4480 rcu_read_lock(); 4481 4482 ap = &sdata->u.ap; 4483 presp = rcu_dereference(ap->probe_resp); 4484 if (!presp) 4485 goto out; 4486 4487 skb = dev_alloc_skb(presp->len); 4488 if (!skb) 4489 goto out; 4490 4491 skb_put_data(skb, presp->data, presp->len); 4492 4493 hdr = (struct ieee80211_hdr *) skb->data; 4494 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4495 4496 out: 4497 rcu_read_unlock(); 4498 return skb; 4499 } 4500 EXPORT_SYMBOL(ieee80211_proberesp_get); 4501 4502 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4503 struct ieee80211_vif *vif) 4504 { 4505 struct ieee80211_sub_if_data *sdata; 4506 struct ieee80211_if_managed *ifmgd; 4507 struct ieee80211_pspoll *pspoll; 4508 struct ieee80211_local *local; 4509 struct sk_buff *skb; 4510 4511 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4512 return NULL; 4513 4514 sdata = vif_to_sdata(vif); 4515 ifmgd = &sdata->u.mgd; 4516 local = sdata->local; 4517 4518 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4519 if (!skb) 4520 return NULL; 4521 4522 skb_reserve(skb, local->hw.extra_tx_headroom); 4523 4524 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4525 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4526 IEEE80211_STYPE_PSPOLL); 4527 pspoll->aid = cpu_to_le16(ifmgd->aid); 4528 4529 /* aid in PS-Poll has its two MSBs each set to 1 */ 4530 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4531 4532 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4533 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4534 4535 return skb; 4536 } 4537 EXPORT_SYMBOL(ieee80211_pspoll_get); 4538 4539 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4540 struct ieee80211_vif *vif, 4541 bool qos_ok) 4542 { 4543 struct ieee80211_hdr_3addr *nullfunc; 4544 struct ieee80211_sub_if_data *sdata; 4545 struct ieee80211_if_managed *ifmgd; 4546 struct ieee80211_local *local; 4547 struct sk_buff *skb; 4548 bool qos = false; 4549 4550 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4551 return NULL; 4552 4553 sdata = vif_to_sdata(vif); 4554 ifmgd = &sdata->u.mgd; 4555 local = sdata->local; 4556 4557 if (qos_ok) { 4558 struct sta_info *sta; 4559 4560 rcu_read_lock(); 4561 sta = sta_info_get(sdata, ifmgd->bssid); 4562 qos = sta && sta->sta.wme; 4563 rcu_read_unlock(); 4564 } 4565 4566 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4567 sizeof(*nullfunc) + 2); 4568 if (!skb) 4569 return NULL; 4570 4571 skb_reserve(skb, local->hw.extra_tx_headroom); 4572 4573 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4574 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4575 IEEE80211_STYPE_NULLFUNC | 4576 IEEE80211_FCTL_TODS); 4577 if (qos) { 4578 __le16 qos = cpu_to_le16(7); 4579 4580 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4581 IEEE80211_STYPE_NULLFUNC) != 4582 IEEE80211_STYPE_QOS_NULLFUNC); 4583 nullfunc->frame_control |= 4584 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4585 skb->priority = 7; 4586 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4587 skb_put_data(skb, &qos, sizeof(qos)); 4588 } 4589 4590 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4591 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4592 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4593 4594 return skb; 4595 } 4596 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4597 4598 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4599 const u8 *src_addr, 4600 const u8 *ssid, size_t ssid_len, 4601 size_t tailroom) 4602 { 4603 struct ieee80211_local *local = hw_to_local(hw); 4604 struct ieee80211_hdr_3addr *hdr; 4605 struct sk_buff *skb; 4606 size_t ie_ssid_len; 4607 u8 *pos; 4608 4609 ie_ssid_len = 2 + ssid_len; 4610 4611 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4612 ie_ssid_len + tailroom); 4613 if (!skb) 4614 return NULL; 4615 4616 skb_reserve(skb, local->hw.extra_tx_headroom); 4617 4618 hdr = skb_put_zero(skb, sizeof(*hdr)); 4619 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4620 IEEE80211_STYPE_PROBE_REQ); 4621 eth_broadcast_addr(hdr->addr1); 4622 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4623 eth_broadcast_addr(hdr->addr3); 4624 4625 pos = skb_put(skb, ie_ssid_len); 4626 *pos++ = WLAN_EID_SSID; 4627 *pos++ = ssid_len; 4628 if (ssid_len) 4629 memcpy(pos, ssid, ssid_len); 4630 pos += ssid_len; 4631 4632 return skb; 4633 } 4634 EXPORT_SYMBOL(ieee80211_probereq_get); 4635 4636 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4637 const void *frame, size_t frame_len, 4638 const struct ieee80211_tx_info *frame_txctl, 4639 struct ieee80211_rts *rts) 4640 { 4641 const struct ieee80211_hdr *hdr = frame; 4642 4643 rts->frame_control = 4644 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4645 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4646 frame_txctl); 4647 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4648 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4649 } 4650 EXPORT_SYMBOL(ieee80211_rts_get); 4651 4652 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4653 const void *frame, size_t frame_len, 4654 const struct ieee80211_tx_info *frame_txctl, 4655 struct ieee80211_cts *cts) 4656 { 4657 const struct ieee80211_hdr *hdr = frame; 4658 4659 cts->frame_control = 4660 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4661 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4662 frame_len, frame_txctl); 4663 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4664 } 4665 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4666 4667 struct sk_buff * 4668 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4669 struct ieee80211_vif *vif) 4670 { 4671 struct ieee80211_local *local = hw_to_local(hw); 4672 struct sk_buff *skb = NULL; 4673 struct ieee80211_tx_data tx; 4674 struct ieee80211_sub_if_data *sdata; 4675 struct ps_data *ps; 4676 struct ieee80211_tx_info *info; 4677 struct ieee80211_chanctx_conf *chanctx_conf; 4678 4679 sdata = vif_to_sdata(vif); 4680 4681 rcu_read_lock(); 4682 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4683 4684 if (!chanctx_conf) 4685 goto out; 4686 4687 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4688 struct beacon_data *beacon = 4689 rcu_dereference(sdata->u.ap.beacon); 4690 4691 if (!beacon || !beacon->head) 4692 goto out; 4693 4694 ps = &sdata->u.ap.ps; 4695 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4696 ps = &sdata->u.mesh.ps; 4697 } else { 4698 goto out; 4699 } 4700 4701 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4702 goto out; /* send buffered bc/mc only after DTIM beacon */ 4703 4704 while (1) { 4705 skb = skb_dequeue(&ps->bc_buf); 4706 if (!skb) 4707 goto out; 4708 local->total_ps_buffered--; 4709 4710 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4711 struct ieee80211_hdr *hdr = 4712 (struct ieee80211_hdr *) skb->data; 4713 /* more buffered multicast/broadcast frames ==> set 4714 * MoreData flag in IEEE 802.11 header to inform PS 4715 * STAs */ 4716 hdr->frame_control |= 4717 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4718 } 4719 4720 if (sdata->vif.type == NL80211_IFTYPE_AP) 4721 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4722 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4723 break; 4724 ieee80211_free_txskb(hw, skb); 4725 } 4726 4727 info = IEEE80211_SKB_CB(skb); 4728 4729 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4730 info->band = chanctx_conf->def.chan->band; 4731 4732 if (invoke_tx_handlers(&tx)) 4733 skb = NULL; 4734 out: 4735 rcu_read_unlock(); 4736 4737 return skb; 4738 } 4739 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4740 4741 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4742 { 4743 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4744 struct ieee80211_sub_if_data *sdata = sta->sdata; 4745 struct ieee80211_local *local = sdata->local; 4746 int ret; 4747 u32 queues; 4748 4749 lockdep_assert_held(&local->sta_mtx); 4750 4751 /* only some cases are supported right now */ 4752 switch (sdata->vif.type) { 4753 case NL80211_IFTYPE_STATION: 4754 case NL80211_IFTYPE_AP: 4755 case NL80211_IFTYPE_AP_VLAN: 4756 break; 4757 default: 4758 WARN_ON(1); 4759 return -EINVAL; 4760 } 4761 4762 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4763 return -EINVAL; 4764 4765 if (sta->reserved_tid == tid) { 4766 ret = 0; 4767 goto out; 4768 } 4769 4770 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4771 sdata_err(sdata, "TID reservation already active\n"); 4772 ret = -EALREADY; 4773 goto out; 4774 } 4775 4776 ieee80211_stop_vif_queues(sdata->local, sdata, 4777 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4778 4779 synchronize_net(); 4780 4781 /* Tear down BA sessions so we stop aggregating on this TID */ 4782 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4783 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4784 __ieee80211_stop_tx_ba_session(sta, tid, 4785 AGG_STOP_LOCAL_REQUEST); 4786 } 4787 4788 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4789 __ieee80211_flush_queues(local, sdata, queues, false); 4790 4791 sta->reserved_tid = tid; 4792 4793 ieee80211_wake_vif_queues(local, sdata, 4794 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4795 4796 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4797 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4798 4799 ret = 0; 4800 out: 4801 return ret; 4802 } 4803 EXPORT_SYMBOL(ieee80211_reserve_tid); 4804 4805 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4806 { 4807 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4808 struct ieee80211_sub_if_data *sdata = sta->sdata; 4809 4810 lockdep_assert_held(&sdata->local->sta_mtx); 4811 4812 /* only some cases are supported right now */ 4813 switch (sdata->vif.type) { 4814 case NL80211_IFTYPE_STATION: 4815 case NL80211_IFTYPE_AP: 4816 case NL80211_IFTYPE_AP_VLAN: 4817 break; 4818 default: 4819 WARN_ON(1); 4820 return; 4821 } 4822 4823 if (tid != sta->reserved_tid) { 4824 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4825 return; 4826 } 4827 4828 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4829 } 4830 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4831 4832 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4833 struct sk_buff *skb, int tid, 4834 enum nl80211_band band, u32 txdata_flags) 4835 { 4836 int ac = ieee80211_ac_from_tid(tid); 4837 4838 skb_reset_mac_header(skb); 4839 skb_set_queue_mapping(skb, ac); 4840 skb->priority = tid; 4841 4842 skb->dev = sdata->dev; 4843 4844 /* 4845 * The other path calling ieee80211_xmit is from the tasklet, 4846 * and while we can handle concurrent transmissions locking 4847 * requirements are that we do not come into tx with bhs on. 4848 */ 4849 local_bh_disable(); 4850 IEEE80211_SKB_CB(skb)->band = band; 4851 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 4852 local_bh_enable(); 4853 } 4854 4855 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 4856 const u8 *buf, size_t len, 4857 const u8 *dest, __be16 proto, bool unencrypted) 4858 { 4859 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4860 struct ieee80211_local *local = sdata->local; 4861 struct sk_buff *skb; 4862 struct ethhdr *ehdr; 4863 u32 flags; 4864 4865 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 4866 * or Pre-Authentication 4867 */ 4868 if (proto != sdata->control_port_protocol && 4869 proto != cpu_to_be16(ETH_P_PREAUTH)) 4870 return -EINVAL; 4871 4872 if (unencrypted) 4873 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 4874 else 4875 flags = 0; 4876 4877 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4878 sizeof(struct ethhdr) + len); 4879 if (!skb) 4880 return -ENOMEM; 4881 4882 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 4883 4884 skb_put_data(skb, buf, len); 4885 4886 ehdr = skb_push(skb, sizeof(struct ethhdr)); 4887 memcpy(ehdr->h_dest, dest, ETH_ALEN); 4888 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 4889 ehdr->h_proto = proto; 4890 4891 skb->dev = dev; 4892 skb->protocol = htons(ETH_P_802_3); 4893 skb_reset_network_header(skb); 4894 skb_reset_mac_header(skb); 4895 4896 local_bh_disable(); 4897 __ieee80211_subif_start_xmit(skb, skb->dev, flags); 4898 local_bh_enable(); 4899 4900 return 0; 4901 } 4902