1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2020 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 42 { 43 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 44 45 u64_stats_update_begin(&tstats->syncp); 46 tstats->tx_packets++; 47 tstats->tx_bytes += len; 48 u64_stats_update_end(&tstats->syncp); 49 } 50 51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 52 struct sk_buff *skb, int group_addr, 53 int next_frag_len) 54 { 55 int rate, mrate, erp, dur, i, shift = 0; 56 struct ieee80211_rate *txrate; 57 struct ieee80211_local *local = tx->local; 58 struct ieee80211_supported_band *sband; 59 struct ieee80211_hdr *hdr; 60 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 61 struct ieee80211_chanctx_conf *chanctx_conf; 62 u32 rate_flags = 0; 63 64 /* assume HW handles this */ 65 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 66 return 0; 67 68 rcu_read_lock(); 69 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 70 if (chanctx_conf) { 71 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 72 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 73 } 74 rcu_read_unlock(); 75 76 /* uh huh? */ 77 if (WARN_ON_ONCE(tx->rate.idx < 0)) 78 return 0; 79 80 sband = local->hw.wiphy->bands[info->band]; 81 txrate = &sband->bitrates[tx->rate.idx]; 82 83 erp = txrate->flags & IEEE80211_RATE_ERP_G; 84 85 /* device is expected to do this */ 86 if (sband->band == NL80211_BAND_S1GHZ) 87 return 0; 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 case NL80211_BAND_6GHZ: 170 if (r->flags & IEEE80211_RATE_MANDATORY_A) 171 mrate = r->bitrate; 172 break; 173 case NL80211_BAND_S1GHZ: 174 case NL80211_BAND_60GHZ: 175 /* TODO, for now fall through */ 176 case NUM_NL80211_BANDS: 177 WARN_ON(1); 178 break; 179 } 180 } 181 if (rate == -1) { 182 /* No matching basic rate found; use highest suitable mandatory 183 * PHY rate */ 184 rate = DIV_ROUND_UP(mrate, 1 << shift); 185 } 186 187 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 188 if (ieee80211_is_data_qos(hdr->frame_control) && 189 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 190 dur = 0; 191 else 192 /* Time needed to transmit ACK 193 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 194 * to closest integer */ 195 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 196 tx->sdata->vif.bss_conf.use_short_preamble, 197 shift); 198 199 if (next_frag_len) { 200 /* Frame is fragmented: duration increases with time needed to 201 * transmit next fragment plus ACK and 2 x SIFS. */ 202 dur *= 2; /* ACK + SIFS */ 203 /* next fragment */ 204 dur += ieee80211_frame_duration(sband->band, next_frag_len, 205 txrate->bitrate, erp, 206 tx->sdata->vif.bss_conf.use_short_preamble, 207 shift); 208 } 209 210 return cpu_to_le16(dur); 211 } 212 213 /* tx handlers */ 214 static ieee80211_tx_result debug_noinline 215 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 216 { 217 struct ieee80211_local *local = tx->local; 218 struct ieee80211_if_managed *ifmgd; 219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 220 221 /* driver doesn't support power save */ 222 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 223 return TX_CONTINUE; 224 225 /* hardware does dynamic power save */ 226 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 227 return TX_CONTINUE; 228 229 /* dynamic power save disabled */ 230 if (local->hw.conf.dynamic_ps_timeout <= 0) 231 return TX_CONTINUE; 232 233 /* we are scanning, don't enable power save */ 234 if (local->scanning) 235 return TX_CONTINUE; 236 237 if (!local->ps_sdata) 238 return TX_CONTINUE; 239 240 /* No point if we're going to suspend */ 241 if (local->quiescing) 242 return TX_CONTINUE; 243 244 /* dynamic ps is supported only in managed mode */ 245 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 246 return TX_CONTINUE; 247 248 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 249 return TX_CONTINUE; 250 251 ifmgd = &tx->sdata->u.mgd; 252 253 /* 254 * Don't wakeup from power save if u-apsd is enabled, voip ac has 255 * u-apsd enabled and the frame is in voip class. This effectively 256 * means that even if all access categories have u-apsd enabled, in 257 * practise u-apsd is only used with the voip ac. This is a 258 * workaround for the case when received voip class packets do not 259 * have correct qos tag for some reason, due the network or the 260 * peer application. 261 * 262 * Note: ifmgd->uapsd_queues access is racy here. If the value is 263 * changed via debugfs, user needs to reassociate manually to have 264 * everything in sync. 265 */ 266 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 267 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 268 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 269 return TX_CONTINUE; 270 271 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 272 ieee80211_stop_queues_by_reason(&local->hw, 273 IEEE80211_MAX_QUEUE_MAP, 274 IEEE80211_QUEUE_STOP_REASON_PS, 275 false); 276 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 277 ieee80211_queue_work(&local->hw, 278 &local->dynamic_ps_disable_work); 279 } 280 281 /* Don't restart the timer if we're not disassociated */ 282 if (!ifmgd->associated) 283 return TX_CONTINUE; 284 285 mod_timer(&local->dynamic_ps_timer, jiffies + 286 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 287 288 return TX_CONTINUE; 289 } 290 291 static ieee80211_tx_result debug_noinline 292 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 293 { 294 295 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 297 bool assoc = false; 298 299 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 300 return TX_CONTINUE; 301 302 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 303 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 304 !ieee80211_is_probe_req(hdr->frame_control) && 305 !ieee80211_is_any_nullfunc(hdr->frame_control)) 306 /* 307 * When software scanning only nullfunc frames (to notify 308 * the sleep state to the AP) and probe requests (for the 309 * active scan) are allowed, all other frames should not be 310 * sent and we should not get here, but if we do 311 * nonetheless, drop them to avoid sending them 312 * off-channel. See the link below and 313 * ieee80211_start_scan() for more. 314 * 315 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 316 */ 317 return TX_DROP; 318 319 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 320 return TX_CONTINUE; 321 322 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 323 return TX_CONTINUE; 324 325 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 326 return TX_CONTINUE; 327 328 if (tx->sta) 329 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 330 331 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 332 if (unlikely(!assoc && 333 ieee80211_is_data(hdr->frame_control))) { 334 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 335 sdata_info(tx->sdata, 336 "dropped data frame to not associated station %pM\n", 337 hdr->addr1); 338 #endif 339 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 340 return TX_DROP; 341 } 342 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 343 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 344 /* 345 * No associated STAs - no need to send multicast 346 * frames. 347 */ 348 return TX_DROP; 349 } 350 351 return TX_CONTINUE; 352 } 353 354 /* This function is called whenever the AP is about to exceed the maximum limit 355 * of buffered frames for power saving STAs. This situation should not really 356 * happen often during normal operation, so dropping the oldest buffered packet 357 * from each queue should be OK to make some room for new frames. */ 358 static void purge_old_ps_buffers(struct ieee80211_local *local) 359 { 360 int total = 0, purged = 0; 361 struct sk_buff *skb; 362 struct ieee80211_sub_if_data *sdata; 363 struct sta_info *sta; 364 365 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 366 struct ps_data *ps; 367 368 if (sdata->vif.type == NL80211_IFTYPE_AP) 369 ps = &sdata->u.ap.ps; 370 else if (ieee80211_vif_is_mesh(&sdata->vif)) 371 ps = &sdata->u.mesh.ps; 372 else 373 continue; 374 375 skb = skb_dequeue(&ps->bc_buf); 376 if (skb) { 377 purged++; 378 ieee80211_free_txskb(&local->hw, skb); 379 } 380 total += skb_queue_len(&ps->bc_buf); 381 } 382 383 /* 384 * Drop one frame from each station from the lowest-priority 385 * AC that has frames at all. 386 */ 387 list_for_each_entry_rcu(sta, &local->sta_list, list) { 388 int ac; 389 390 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 391 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 392 total += skb_queue_len(&sta->ps_tx_buf[ac]); 393 if (skb) { 394 purged++; 395 ieee80211_free_txskb(&local->hw, skb); 396 break; 397 } 398 } 399 } 400 401 local->total_ps_buffered = total; 402 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 403 } 404 405 static ieee80211_tx_result 406 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 407 { 408 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 409 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 410 struct ps_data *ps; 411 412 /* 413 * broadcast/multicast frame 414 * 415 * If any of the associated/peer stations is in power save mode, 416 * the frame is buffered to be sent after DTIM beacon frame. 417 * This is done either by the hardware or us. 418 */ 419 420 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 421 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 422 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 423 if (!tx->sdata->bss) 424 return TX_CONTINUE; 425 426 ps = &tx->sdata->bss->ps; 427 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 428 ps = &tx->sdata->u.mesh.ps; 429 } else { 430 return TX_CONTINUE; 431 } 432 433 434 /* no buffering for ordered frames */ 435 if (ieee80211_has_order(hdr->frame_control)) 436 return TX_CONTINUE; 437 438 if (ieee80211_is_probe_req(hdr->frame_control)) 439 return TX_CONTINUE; 440 441 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 442 info->hw_queue = tx->sdata->vif.cab_queue; 443 444 /* no stations in PS mode and no buffered packets */ 445 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 446 return TX_CONTINUE; 447 448 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 449 450 /* device releases frame after DTIM beacon */ 451 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 452 return TX_CONTINUE; 453 454 /* buffered in mac80211 */ 455 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 456 purge_old_ps_buffers(tx->local); 457 458 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 459 ps_dbg(tx->sdata, 460 "BC TX buffer full - dropping the oldest frame\n"); 461 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 462 } else 463 tx->local->total_ps_buffered++; 464 465 skb_queue_tail(&ps->bc_buf, tx->skb); 466 467 return TX_QUEUED; 468 } 469 470 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 471 struct sk_buff *skb) 472 { 473 if (!ieee80211_is_mgmt(fc)) 474 return 0; 475 476 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 477 return 0; 478 479 if (!ieee80211_is_robust_mgmt_frame(skb)) 480 return 0; 481 482 return 1; 483 } 484 485 static ieee80211_tx_result 486 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 487 { 488 struct sta_info *sta = tx->sta; 489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 490 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 491 struct ieee80211_local *local = tx->local; 492 493 if (unlikely(!sta)) 494 return TX_CONTINUE; 495 496 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 497 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 498 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 499 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 500 int ac = skb_get_queue_mapping(tx->skb); 501 502 if (ieee80211_is_mgmt(hdr->frame_control) && 503 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 504 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 505 return TX_CONTINUE; 506 } 507 508 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 509 sta->sta.addr, sta->sta.aid, ac); 510 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 511 purge_old_ps_buffers(tx->local); 512 513 /* sync with ieee80211_sta_ps_deliver_wakeup */ 514 spin_lock(&sta->ps_lock); 515 /* 516 * STA woke up the meantime and all the frames on ps_tx_buf have 517 * been queued to pending queue. No reordering can happen, go 518 * ahead and Tx the packet. 519 */ 520 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 521 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 522 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 523 spin_unlock(&sta->ps_lock); 524 return TX_CONTINUE; 525 } 526 527 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 528 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 529 ps_dbg(tx->sdata, 530 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 531 sta->sta.addr, ac); 532 ieee80211_free_txskb(&local->hw, old); 533 } else 534 tx->local->total_ps_buffered++; 535 536 info->control.jiffies = jiffies; 537 info->control.vif = &tx->sdata->vif; 538 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 539 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 540 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 541 spin_unlock(&sta->ps_lock); 542 543 if (!timer_pending(&local->sta_cleanup)) 544 mod_timer(&local->sta_cleanup, 545 round_jiffies(jiffies + 546 STA_INFO_CLEANUP_INTERVAL)); 547 548 /* 549 * We queued up some frames, so the TIM bit might 550 * need to be set, recalculate it. 551 */ 552 sta_info_recalc_tim(sta); 553 554 return TX_QUEUED; 555 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 556 ps_dbg(tx->sdata, 557 "STA %pM in PS mode, but polling/in SP -> send frame\n", 558 sta->sta.addr); 559 } 560 561 return TX_CONTINUE; 562 } 563 564 static ieee80211_tx_result debug_noinline 565 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 566 { 567 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 568 return TX_CONTINUE; 569 570 if (tx->flags & IEEE80211_TX_UNICAST) 571 return ieee80211_tx_h_unicast_ps_buf(tx); 572 else 573 return ieee80211_tx_h_multicast_ps_buf(tx); 574 } 575 576 static ieee80211_tx_result debug_noinline 577 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 578 { 579 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 580 581 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 582 if (tx->sdata->control_port_no_encrypt) 583 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 584 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 585 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 586 } 587 588 return TX_CONTINUE; 589 } 590 591 static ieee80211_tx_result debug_noinline 592 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 593 { 594 struct ieee80211_key *key; 595 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 597 598 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 599 tx->key = NULL; 600 return TX_CONTINUE; 601 } 602 603 if (tx->sta && 604 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 605 tx->key = key; 606 else if (ieee80211_is_group_privacy_action(tx->skb) && 607 (key = rcu_dereference(tx->sdata->default_multicast_key))) 608 tx->key = key; 609 else if (ieee80211_is_mgmt(hdr->frame_control) && 610 is_multicast_ether_addr(hdr->addr1) && 611 ieee80211_is_robust_mgmt_frame(tx->skb) && 612 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 613 tx->key = key; 614 else if (is_multicast_ether_addr(hdr->addr1) && 615 (key = rcu_dereference(tx->sdata->default_multicast_key))) 616 tx->key = key; 617 else if (!is_multicast_ether_addr(hdr->addr1) && 618 (key = rcu_dereference(tx->sdata->default_unicast_key))) 619 tx->key = key; 620 else 621 tx->key = NULL; 622 623 if (tx->key) { 624 bool skip_hw = false; 625 626 /* TODO: add threshold stuff again */ 627 628 switch (tx->key->conf.cipher) { 629 case WLAN_CIPHER_SUITE_WEP40: 630 case WLAN_CIPHER_SUITE_WEP104: 631 case WLAN_CIPHER_SUITE_TKIP: 632 if (!ieee80211_is_data_present(hdr->frame_control)) 633 tx->key = NULL; 634 break; 635 case WLAN_CIPHER_SUITE_CCMP: 636 case WLAN_CIPHER_SUITE_CCMP_256: 637 case WLAN_CIPHER_SUITE_GCMP: 638 case WLAN_CIPHER_SUITE_GCMP_256: 639 if (!ieee80211_is_data_present(hdr->frame_control) && 640 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 641 tx->skb) && 642 !ieee80211_is_group_privacy_action(tx->skb)) 643 tx->key = NULL; 644 else 645 skip_hw = (tx->key->conf.flags & 646 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 647 ieee80211_is_mgmt(hdr->frame_control); 648 break; 649 case WLAN_CIPHER_SUITE_AES_CMAC: 650 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 651 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 652 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 653 if (!ieee80211_is_mgmt(hdr->frame_control)) 654 tx->key = NULL; 655 break; 656 } 657 658 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 659 !ieee80211_is_deauth(hdr->frame_control))) 660 return TX_DROP; 661 662 if (!skip_hw && tx->key && 663 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 664 info->control.hw_key = &tx->key->conf; 665 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta && 666 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 667 return TX_DROP; 668 } 669 670 return TX_CONTINUE; 671 } 672 673 static ieee80211_tx_result debug_noinline 674 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 675 { 676 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 677 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 678 struct ieee80211_supported_band *sband; 679 u32 len; 680 struct ieee80211_tx_rate_control txrc; 681 struct ieee80211_sta_rates *ratetbl = NULL; 682 bool assoc = false; 683 684 memset(&txrc, 0, sizeof(txrc)); 685 686 sband = tx->local->hw.wiphy->bands[info->band]; 687 688 len = min_t(u32, tx->skb->len + FCS_LEN, 689 tx->local->hw.wiphy->frag_threshold); 690 691 /* set up the tx rate control struct we give the RC algo */ 692 txrc.hw = &tx->local->hw; 693 txrc.sband = sband; 694 txrc.bss_conf = &tx->sdata->vif.bss_conf; 695 txrc.skb = tx->skb; 696 txrc.reported_rate.idx = -1; 697 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 698 699 if (tx->sdata->rc_has_mcs_mask[info->band]) 700 txrc.rate_idx_mcs_mask = 701 tx->sdata->rc_rateidx_mcs_mask[info->band]; 702 703 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 704 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 705 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 706 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 707 708 /* set up RTS protection if desired */ 709 if (len > tx->local->hw.wiphy->rts_threshold) { 710 txrc.rts = true; 711 } 712 713 info->control.use_rts = txrc.rts; 714 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 715 716 /* 717 * Use short preamble if the BSS can handle it, but not for 718 * management frames unless we know the receiver can handle 719 * that -- the management frame might be to a station that 720 * just wants a probe response. 721 */ 722 if (tx->sdata->vif.bss_conf.use_short_preamble && 723 (ieee80211_is_data(hdr->frame_control) || 724 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 725 txrc.short_preamble = true; 726 727 info->control.short_preamble = txrc.short_preamble; 728 729 /* don't ask rate control when rate already injected via radiotap */ 730 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 731 return TX_CONTINUE; 732 733 if (tx->sta) 734 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 735 736 /* 737 * Lets not bother rate control if we're associated and cannot 738 * talk to the sta. This should not happen. 739 */ 740 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 741 !rate_usable_index_exists(sband, &tx->sta->sta), 742 "%s: Dropped data frame as no usable bitrate found while " 743 "scanning and associated. Target station: " 744 "%pM on %d GHz band\n", 745 tx->sdata->name, hdr->addr1, 746 info->band ? 5 : 2)) 747 return TX_DROP; 748 749 /* 750 * If we're associated with the sta at this point we know we can at 751 * least send the frame at the lowest bit rate. 752 */ 753 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 754 755 if (tx->sta && !info->control.skip_table) 756 ratetbl = rcu_dereference(tx->sta->sta.rates); 757 758 if (unlikely(info->control.rates[0].idx < 0)) { 759 if (ratetbl) { 760 struct ieee80211_tx_rate rate = { 761 .idx = ratetbl->rate[0].idx, 762 .flags = ratetbl->rate[0].flags, 763 .count = ratetbl->rate[0].count 764 }; 765 766 if (ratetbl->rate[0].idx < 0) 767 return TX_DROP; 768 769 tx->rate = rate; 770 } else { 771 return TX_DROP; 772 } 773 } else { 774 tx->rate = info->control.rates[0]; 775 } 776 777 if (txrc.reported_rate.idx < 0) { 778 txrc.reported_rate = tx->rate; 779 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 780 tx->sta->tx_stats.last_rate = txrc.reported_rate; 781 } else if (tx->sta) 782 tx->sta->tx_stats.last_rate = txrc.reported_rate; 783 784 if (ratetbl) 785 return TX_CONTINUE; 786 787 if (unlikely(!info->control.rates[0].count)) 788 info->control.rates[0].count = 1; 789 790 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 791 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 792 info->control.rates[0].count = 1; 793 794 return TX_CONTINUE; 795 } 796 797 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 798 { 799 u16 *seq = &sta->tid_seq[tid]; 800 __le16 ret = cpu_to_le16(*seq); 801 802 /* Increase the sequence number. */ 803 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 804 805 return ret; 806 } 807 808 static ieee80211_tx_result debug_noinline 809 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 810 { 811 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 812 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 813 int tid; 814 815 /* 816 * Packet injection may want to control the sequence 817 * number, if we have no matching interface then we 818 * neither assign one ourselves nor ask the driver to. 819 */ 820 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 821 return TX_CONTINUE; 822 823 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 824 return TX_CONTINUE; 825 826 if (ieee80211_hdrlen(hdr->frame_control) < 24) 827 return TX_CONTINUE; 828 829 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 830 return TX_CONTINUE; 831 832 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 833 return TX_CONTINUE; 834 835 /* 836 * Anything but QoS data that has a sequence number field 837 * (is long enough) gets a sequence number from the global 838 * counter. QoS data frames with a multicast destination 839 * also use the global counter (802.11-2012 9.3.2.10). 840 */ 841 if (!ieee80211_is_data_qos(hdr->frame_control) || 842 is_multicast_ether_addr(hdr->addr1)) { 843 /* driver should assign sequence number */ 844 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 845 /* for pure STA mode without beacons, we can do it */ 846 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 847 tx->sdata->sequence_number += 0x10; 848 if (tx->sta) 849 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 850 return TX_CONTINUE; 851 } 852 853 /* 854 * This should be true for injected/management frames only, for 855 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 856 * above since they are not QoS-data frames. 857 */ 858 if (!tx->sta) 859 return TX_CONTINUE; 860 861 /* include per-STA, per-TID sequence counter */ 862 tid = ieee80211_get_tid(hdr); 863 tx->sta->tx_stats.msdu[tid]++; 864 865 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 866 867 return TX_CONTINUE; 868 } 869 870 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 871 struct sk_buff *skb, int hdrlen, 872 int frag_threshold) 873 { 874 struct ieee80211_local *local = tx->local; 875 struct ieee80211_tx_info *info; 876 struct sk_buff *tmp; 877 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 878 int pos = hdrlen + per_fragm; 879 int rem = skb->len - hdrlen - per_fragm; 880 881 if (WARN_ON(rem < 0)) 882 return -EINVAL; 883 884 /* first fragment was already added to queue by caller */ 885 886 while (rem) { 887 int fraglen = per_fragm; 888 889 if (fraglen > rem) 890 fraglen = rem; 891 rem -= fraglen; 892 tmp = dev_alloc_skb(local->tx_headroom + 893 frag_threshold + 894 tx->sdata->encrypt_headroom + 895 IEEE80211_ENCRYPT_TAILROOM); 896 if (!tmp) 897 return -ENOMEM; 898 899 __skb_queue_tail(&tx->skbs, tmp); 900 901 skb_reserve(tmp, 902 local->tx_headroom + tx->sdata->encrypt_headroom); 903 904 /* copy control information */ 905 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 906 907 info = IEEE80211_SKB_CB(tmp); 908 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 909 IEEE80211_TX_CTL_FIRST_FRAGMENT); 910 911 if (rem) 912 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 913 914 skb_copy_queue_mapping(tmp, skb); 915 tmp->priority = skb->priority; 916 tmp->dev = skb->dev; 917 918 /* copy header and data */ 919 skb_put_data(tmp, skb->data, hdrlen); 920 skb_put_data(tmp, skb->data + pos, fraglen); 921 922 pos += fraglen; 923 } 924 925 /* adjust first fragment's length */ 926 skb_trim(skb, hdrlen + per_fragm); 927 return 0; 928 } 929 930 static ieee80211_tx_result debug_noinline 931 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 932 { 933 struct sk_buff *skb = tx->skb; 934 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 935 struct ieee80211_hdr *hdr = (void *)skb->data; 936 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 937 int hdrlen; 938 int fragnum; 939 940 /* no matter what happens, tx->skb moves to tx->skbs */ 941 __skb_queue_tail(&tx->skbs, skb); 942 tx->skb = NULL; 943 944 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 945 return TX_CONTINUE; 946 947 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 948 return TX_CONTINUE; 949 950 /* 951 * Warn when submitting a fragmented A-MPDU frame and drop it. 952 * This scenario is handled in ieee80211_tx_prepare but extra 953 * caution taken here as fragmented ampdu may cause Tx stop. 954 */ 955 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 956 return TX_DROP; 957 958 hdrlen = ieee80211_hdrlen(hdr->frame_control); 959 960 /* internal error, why isn't DONTFRAG set? */ 961 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 962 return TX_DROP; 963 964 /* 965 * Now fragment the frame. This will allocate all the fragments and 966 * chain them (using skb as the first fragment) to skb->next. 967 * During transmission, we will remove the successfully transmitted 968 * fragments from this list. When the low-level driver rejects one 969 * of the fragments then we will simply pretend to accept the skb 970 * but store it away as pending. 971 */ 972 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 973 return TX_DROP; 974 975 /* update duration/seq/flags of fragments */ 976 fragnum = 0; 977 978 skb_queue_walk(&tx->skbs, skb) { 979 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 980 981 hdr = (void *)skb->data; 982 info = IEEE80211_SKB_CB(skb); 983 984 if (!skb_queue_is_last(&tx->skbs, skb)) { 985 hdr->frame_control |= morefrags; 986 /* 987 * No multi-rate retries for fragmented frames, that 988 * would completely throw off the NAV at other STAs. 989 */ 990 info->control.rates[1].idx = -1; 991 info->control.rates[2].idx = -1; 992 info->control.rates[3].idx = -1; 993 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 994 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 995 } else { 996 hdr->frame_control &= ~morefrags; 997 } 998 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 999 fragnum++; 1000 } 1001 1002 return TX_CONTINUE; 1003 } 1004 1005 static ieee80211_tx_result debug_noinline 1006 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1007 { 1008 struct sk_buff *skb; 1009 int ac = -1; 1010 1011 if (!tx->sta) 1012 return TX_CONTINUE; 1013 1014 skb_queue_walk(&tx->skbs, skb) { 1015 ac = skb_get_queue_mapping(skb); 1016 tx->sta->tx_stats.bytes[ac] += skb->len; 1017 } 1018 if (ac >= 0) 1019 tx->sta->tx_stats.packets[ac]++; 1020 1021 return TX_CONTINUE; 1022 } 1023 1024 static ieee80211_tx_result debug_noinline 1025 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1026 { 1027 if (!tx->key) 1028 return TX_CONTINUE; 1029 1030 switch (tx->key->conf.cipher) { 1031 case WLAN_CIPHER_SUITE_WEP40: 1032 case WLAN_CIPHER_SUITE_WEP104: 1033 return ieee80211_crypto_wep_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_TKIP: 1035 return ieee80211_crypto_tkip_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_CCMP: 1037 return ieee80211_crypto_ccmp_encrypt( 1038 tx, IEEE80211_CCMP_MIC_LEN); 1039 case WLAN_CIPHER_SUITE_CCMP_256: 1040 return ieee80211_crypto_ccmp_encrypt( 1041 tx, IEEE80211_CCMP_256_MIC_LEN); 1042 case WLAN_CIPHER_SUITE_AES_CMAC: 1043 return ieee80211_crypto_aes_cmac_encrypt(tx); 1044 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1045 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1046 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1047 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1048 return ieee80211_crypto_aes_gmac_encrypt(tx); 1049 case WLAN_CIPHER_SUITE_GCMP: 1050 case WLAN_CIPHER_SUITE_GCMP_256: 1051 return ieee80211_crypto_gcmp_encrypt(tx); 1052 default: 1053 return ieee80211_crypto_hw_encrypt(tx); 1054 } 1055 1056 return TX_DROP; 1057 } 1058 1059 static ieee80211_tx_result debug_noinline 1060 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1061 { 1062 struct sk_buff *skb; 1063 struct ieee80211_hdr *hdr; 1064 int next_len; 1065 bool group_addr; 1066 1067 skb_queue_walk(&tx->skbs, skb) { 1068 hdr = (void *) skb->data; 1069 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1070 break; /* must not overwrite AID */ 1071 if (!skb_queue_is_last(&tx->skbs, skb)) { 1072 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1073 next_len = next->len; 1074 } else 1075 next_len = 0; 1076 group_addr = is_multicast_ether_addr(hdr->addr1); 1077 1078 hdr->duration_id = 1079 ieee80211_duration(tx, skb, group_addr, next_len); 1080 } 1081 1082 return TX_CONTINUE; 1083 } 1084 1085 /* actual transmit path */ 1086 1087 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1088 struct sk_buff *skb, 1089 struct ieee80211_tx_info *info, 1090 struct tid_ampdu_tx *tid_tx, 1091 int tid) 1092 { 1093 bool queued = false; 1094 bool reset_agg_timer = false; 1095 struct sk_buff *purge_skb = NULL; 1096 1097 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1098 info->flags |= IEEE80211_TX_CTL_AMPDU; 1099 reset_agg_timer = true; 1100 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1101 /* 1102 * nothing -- this aggregation session is being started 1103 * but that might still fail with the driver 1104 */ 1105 } else if (!tx->sta->sta.txq[tid]) { 1106 spin_lock(&tx->sta->lock); 1107 /* 1108 * Need to re-check now, because we may get here 1109 * 1110 * 1) in the window during which the setup is actually 1111 * already done, but not marked yet because not all 1112 * packets are spliced over to the driver pending 1113 * queue yet -- if this happened we acquire the lock 1114 * either before or after the splice happens, but 1115 * need to recheck which of these cases happened. 1116 * 1117 * 2) during session teardown, if the OPERATIONAL bit 1118 * was cleared due to the teardown but the pointer 1119 * hasn't been assigned NULL yet (or we loaded it 1120 * before it was assigned) -- in this case it may 1121 * now be NULL which means we should just let the 1122 * packet pass through because splicing the frames 1123 * back is already done. 1124 */ 1125 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1126 1127 if (!tid_tx) { 1128 /* do nothing, let packet pass through */ 1129 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1130 info->flags |= IEEE80211_TX_CTL_AMPDU; 1131 reset_agg_timer = true; 1132 } else { 1133 queued = true; 1134 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1135 clear_sta_flag(tx->sta, WLAN_STA_SP); 1136 ps_dbg(tx->sta->sdata, 1137 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1138 tx->sta->sta.addr, tx->sta->sta.aid); 1139 } 1140 info->control.vif = &tx->sdata->vif; 1141 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1142 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1143 __skb_queue_tail(&tid_tx->pending, skb); 1144 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1145 purge_skb = __skb_dequeue(&tid_tx->pending); 1146 } 1147 spin_unlock(&tx->sta->lock); 1148 1149 if (purge_skb) 1150 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1151 } 1152 1153 /* reset session timer */ 1154 if (reset_agg_timer) 1155 tid_tx->last_tx = jiffies; 1156 1157 return queued; 1158 } 1159 1160 /* 1161 * initialises @tx 1162 * pass %NULL for the station if unknown, a valid pointer if known 1163 * or an ERR_PTR() if the station is known not to exist 1164 */ 1165 static ieee80211_tx_result 1166 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1167 struct ieee80211_tx_data *tx, 1168 struct sta_info *sta, struct sk_buff *skb) 1169 { 1170 struct ieee80211_local *local = sdata->local; 1171 struct ieee80211_hdr *hdr; 1172 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1173 int tid; 1174 1175 memset(tx, 0, sizeof(*tx)); 1176 tx->skb = skb; 1177 tx->local = local; 1178 tx->sdata = sdata; 1179 __skb_queue_head_init(&tx->skbs); 1180 1181 /* 1182 * If this flag is set to true anywhere, and we get here, 1183 * we are doing the needed processing, so remove the flag 1184 * now. 1185 */ 1186 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1187 1188 hdr = (struct ieee80211_hdr *) skb->data; 1189 1190 if (likely(sta)) { 1191 if (!IS_ERR(sta)) 1192 tx->sta = sta; 1193 } else { 1194 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1195 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1196 if (!tx->sta && sdata->wdev.use_4addr) 1197 return TX_DROP; 1198 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1199 IEEE80211_TX_CTL_INJECTED) || 1200 tx->sdata->control_port_protocol == tx->skb->protocol) { 1201 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1202 } 1203 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1204 tx->sta = sta_info_get(sdata, hdr->addr1); 1205 } 1206 1207 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1208 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1209 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1210 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1211 struct tid_ampdu_tx *tid_tx; 1212 1213 tid = ieee80211_get_tid(hdr); 1214 1215 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1216 if (tid_tx) { 1217 bool queued; 1218 1219 queued = ieee80211_tx_prep_agg(tx, skb, info, 1220 tid_tx, tid); 1221 1222 if (unlikely(queued)) 1223 return TX_QUEUED; 1224 } 1225 } 1226 1227 if (is_multicast_ether_addr(hdr->addr1)) { 1228 tx->flags &= ~IEEE80211_TX_UNICAST; 1229 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1230 } else 1231 tx->flags |= IEEE80211_TX_UNICAST; 1232 1233 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1234 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1235 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1236 info->flags & IEEE80211_TX_CTL_AMPDU) 1237 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1238 } 1239 1240 if (!tx->sta) 1241 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1242 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1243 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1244 ieee80211_check_fast_xmit(tx->sta); 1245 } 1246 1247 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1248 1249 return TX_CONTINUE; 1250 } 1251 1252 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1253 struct ieee80211_vif *vif, 1254 struct sta_info *sta, 1255 struct sk_buff *skb) 1256 { 1257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1259 struct ieee80211_txq *txq = NULL; 1260 1261 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1262 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1263 return NULL; 1264 1265 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1266 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1267 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1268 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1269 vif->type == NL80211_IFTYPE_STATION) && 1270 sta && sta->uploaded) { 1271 /* 1272 * This will be NULL if the driver didn't set the 1273 * opt-in hardware flag. 1274 */ 1275 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1276 } 1277 } else if (sta) { 1278 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1279 1280 if (!sta->uploaded) 1281 return NULL; 1282 1283 txq = sta->sta.txq[tid]; 1284 } else if (vif) { 1285 txq = vif->txq; 1286 } 1287 1288 if (!txq) 1289 return NULL; 1290 1291 return to_txq_info(txq); 1292 } 1293 1294 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1295 { 1296 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1297 } 1298 1299 static u32 codel_skb_len_func(const struct sk_buff *skb) 1300 { 1301 return skb->len; 1302 } 1303 1304 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1305 { 1306 const struct ieee80211_tx_info *info; 1307 1308 info = (const struct ieee80211_tx_info *)skb->cb; 1309 return info->control.enqueue_time; 1310 } 1311 1312 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1313 void *ctx) 1314 { 1315 struct ieee80211_local *local; 1316 struct txq_info *txqi; 1317 struct fq *fq; 1318 struct fq_flow *flow; 1319 1320 txqi = ctx; 1321 local = vif_to_sdata(txqi->txq.vif)->local; 1322 fq = &local->fq; 1323 1324 if (cvars == &txqi->def_cvars) 1325 flow = &txqi->def_flow; 1326 else 1327 flow = &fq->flows[cvars - local->cvars]; 1328 1329 return fq_flow_dequeue(fq, flow); 1330 } 1331 1332 static void codel_drop_func(struct sk_buff *skb, 1333 void *ctx) 1334 { 1335 struct ieee80211_local *local; 1336 struct ieee80211_hw *hw; 1337 struct txq_info *txqi; 1338 1339 txqi = ctx; 1340 local = vif_to_sdata(txqi->txq.vif)->local; 1341 hw = &local->hw; 1342 1343 ieee80211_free_txskb(hw, skb); 1344 } 1345 1346 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1347 struct fq_tin *tin, 1348 struct fq_flow *flow) 1349 { 1350 struct ieee80211_local *local; 1351 struct txq_info *txqi; 1352 struct codel_vars *cvars; 1353 struct codel_params *cparams; 1354 struct codel_stats *cstats; 1355 1356 local = container_of(fq, struct ieee80211_local, fq); 1357 txqi = container_of(tin, struct txq_info, tin); 1358 cstats = &txqi->cstats; 1359 1360 if (txqi->txq.sta) { 1361 struct sta_info *sta = container_of(txqi->txq.sta, 1362 struct sta_info, sta); 1363 cparams = &sta->cparams; 1364 } else { 1365 cparams = &local->cparams; 1366 } 1367 1368 if (flow == &txqi->def_flow) 1369 cvars = &txqi->def_cvars; 1370 else 1371 cvars = &local->cvars[flow - fq->flows]; 1372 1373 return codel_dequeue(txqi, 1374 &flow->backlog, 1375 cparams, 1376 cvars, 1377 cstats, 1378 codel_skb_len_func, 1379 codel_skb_time_func, 1380 codel_drop_func, 1381 codel_dequeue_func); 1382 } 1383 1384 static void fq_skb_free_func(struct fq *fq, 1385 struct fq_tin *tin, 1386 struct fq_flow *flow, 1387 struct sk_buff *skb) 1388 { 1389 struct ieee80211_local *local; 1390 1391 local = container_of(fq, struct ieee80211_local, fq); 1392 ieee80211_free_txskb(&local->hw, skb); 1393 } 1394 1395 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1396 struct fq_tin *tin, 1397 int idx, 1398 struct sk_buff *skb) 1399 { 1400 struct txq_info *txqi; 1401 1402 txqi = container_of(tin, struct txq_info, tin); 1403 return &txqi->def_flow; 1404 } 1405 1406 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1407 struct txq_info *txqi, 1408 struct sk_buff *skb) 1409 { 1410 struct fq *fq = &local->fq; 1411 struct fq_tin *tin = &txqi->tin; 1412 u32 flow_idx = fq_flow_idx(fq, skb); 1413 1414 ieee80211_set_skb_enqueue_time(skb); 1415 1416 spin_lock_bh(&fq->lock); 1417 fq_tin_enqueue(fq, tin, flow_idx, skb, 1418 fq_skb_free_func, 1419 fq_flow_get_default_func); 1420 spin_unlock_bh(&fq->lock); 1421 } 1422 1423 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1424 struct fq_flow *flow, struct sk_buff *skb, 1425 void *data) 1426 { 1427 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1428 1429 return info->control.vif == data; 1430 } 1431 1432 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1433 struct ieee80211_sub_if_data *sdata) 1434 { 1435 struct fq *fq = &local->fq; 1436 struct txq_info *txqi; 1437 struct fq_tin *tin; 1438 struct ieee80211_sub_if_data *ap; 1439 1440 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1441 return; 1442 1443 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1444 1445 if (!ap->vif.txq) 1446 return; 1447 1448 txqi = to_txq_info(ap->vif.txq); 1449 tin = &txqi->tin; 1450 1451 spin_lock_bh(&fq->lock); 1452 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1453 fq_skb_free_func); 1454 spin_unlock_bh(&fq->lock); 1455 } 1456 1457 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1458 struct sta_info *sta, 1459 struct txq_info *txqi, int tid) 1460 { 1461 fq_tin_init(&txqi->tin); 1462 fq_flow_init(&txqi->def_flow); 1463 codel_vars_init(&txqi->def_cvars); 1464 codel_stats_init(&txqi->cstats); 1465 __skb_queue_head_init(&txqi->frags); 1466 INIT_LIST_HEAD(&txqi->schedule_order); 1467 1468 txqi->txq.vif = &sdata->vif; 1469 1470 if (!sta) { 1471 sdata->vif.txq = &txqi->txq; 1472 txqi->txq.tid = 0; 1473 txqi->txq.ac = IEEE80211_AC_BE; 1474 1475 return; 1476 } 1477 1478 if (tid == IEEE80211_NUM_TIDS) { 1479 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1480 /* Drivers need to opt in to the management MPDU TXQ */ 1481 if (!ieee80211_hw_check(&sdata->local->hw, 1482 STA_MMPDU_TXQ)) 1483 return; 1484 } else if (!ieee80211_hw_check(&sdata->local->hw, 1485 BUFF_MMPDU_TXQ)) { 1486 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1487 return; 1488 } 1489 txqi->txq.ac = IEEE80211_AC_VO; 1490 } else { 1491 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1492 } 1493 1494 txqi->txq.sta = &sta->sta; 1495 txqi->txq.tid = tid; 1496 sta->sta.txq[tid] = &txqi->txq; 1497 } 1498 1499 void ieee80211_txq_purge(struct ieee80211_local *local, 1500 struct txq_info *txqi) 1501 { 1502 struct fq *fq = &local->fq; 1503 struct fq_tin *tin = &txqi->tin; 1504 1505 spin_lock_bh(&fq->lock); 1506 fq_tin_reset(fq, tin, fq_skb_free_func); 1507 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1508 spin_unlock_bh(&fq->lock); 1509 1510 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1511 list_del_init(&txqi->schedule_order); 1512 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1513 } 1514 1515 void ieee80211_txq_set_params(struct ieee80211_local *local) 1516 { 1517 if (local->hw.wiphy->txq_limit) 1518 local->fq.limit = local->hw.wiphy->txq_limit; 1519 else 1520 local->hw.wiphy->txq_limit = local->fq.limit; 1521 1522 if (local->hw.wiphy->txq_memory_limit) 1523 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1524 else 1525 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1526 1527 if (local->hw.wiphy->txq_quantum) 1528 local->fq.quantum = local->hw.wiphy->txq_quantum; 1529 else 1530 local->hw.wiphy->txq_quantum = local->fq.quantum; 1531 } 1532 1533 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1534 { 1535 struct fq *fq = &local->fq; 1536 int ret; 1537 int i; 1538 bool supp_vht = false; 1539 enum nl80211_band band; 1540 1541 if (!local->ops->wake_tx_queue) 1542 return 0; 1543 1544 ret = fq_init(fq, 4096); 1545 if (ret) 1546 return ret; 1547 1548 /* 1549 * If the hardware doesn't support VHT, it is safe to limit the maximum 1550 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1551 */ 1552 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1553 struct ieee80211_supported_band *sband; 1554 1555 sband = local->hw.wiphy->bands[band]; 1556 if (!sband) 1557 continue; 1558 1559 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1560 } 1561 1562 if (!supp_vht) 1563 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1564 1565 codel_params_init(&local->cparams); 1566 local->cparams.interval = MS2TIME(100); 1567 local->cparams.target = MS2TIME(20); 1568 local->cparams.ecn = true; 1569 1570 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1571 GFP_KERNEL); 1572 if (!local->cvars) { 1573 spin_lock_bh(&fq->lock); 1574 fq_reset(fq, fq_skb_free_func); 1575 spin_unlock_bh(&fq->lock); 1576 return -ENOMEM; 1577 } 1578 1579 for (i = 0; i < fq->flows_cnt; i++) 1580 codel_vars_init(&local->cvars[i]); 1581 1582 ieee80211_txq_set_params(local); 1583 1584 return 0; 1585 } 1586 1587 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1588 { 1589 struct fq *fq = &local->fq; 1590 1591 if (!local->ops->wake_tx_queue) 1592 return; 1593 1594 kfree(local->cvars); 1595 local->cvars = NULL; 1596 1597 spin_lock_bh(&fq->lock); 1598 fq_reset(fq, fq_skb_free_func); 1599 spin_unlock_bh(&fq->lock); 1600 } 1601 1602 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1603 struct ieee80211_sub_if_data *sdata, 1604 struct sta_info *sta, 1605 struct sk_buff *skb) 1606 { 1607 struct ieee80211_vif *vif; 1608 struct txq_info *txqi; 1609 1610 if (!local->ops->wake_tx_queue || 1611 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1612 return false; 1613 1614 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1615 sdata = container_of(sdata->bss, 1616 struct ieee80211_sub_if_data, u.ap); 1617 1618 vif = &sdata->vif; 1619 txqi = ieee80211_get_txq(local, vif, sta, skb); 1620 1621 if (!txqi) 1622 return false; 1623 1624 ieee80211_txq_enqueue(local, txqi, skb); 1625 1626 schedule_and_wake_txq(local, txqi); 1627 1628 return true; 1629 } 1630 1631 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1632 struct ieee80211_vif *vif, 1633 struct sta_info *sta, 1634 struct sk_buff_head *skbs, 1635 bool txpending) 1636 { 1637 struct ieee80211_tx_control control = {}; 1638 struct sk_buff *skb, *tmp; 1639 unsigned long flags; 1640 1641 skb_queue_walk_safe(skbs, skb, tmp) { 1642 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1643 int q = info->hw_queue; 1644 1645 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1646 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1647 __skb_unlink(skb, skbs); 1648 ieee80211_free_txskb(&local->hw, skb); 1649 continue; 1650 } 1651 #endif 1652 1653 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1654 if (local->queue_stop_reasons[q] || 1655 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1656 if (unlikely(info->flags & 1657 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1658 if (local->queue_stop_reasons[q] & 1659 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1660 /* 1661 * Drop off-channel frames if queues 1662 * are stopped for any reason other 1663 * than off-channel operation. Never 1664 * queue them. 1665 */ 1666 spin_unlock_irqrestore( 1667 &local->queue_stop_reason_lock, 1668 flags); 1669 ieee80211_purge_tx_queue(&local->hw, 1670 skbs); 1671 return true; 1672 } 1673 } else { 1674 1675 /* 1676 * Since queue is stopped, queue up frames for 1677 * later transmission from the tx-pending 1678 * tasklet when the queue is woken again. 1679 */ 1680 if (txpending) 1681 skb_queue_splice_init(skbs, 1682 &local->pending[q]); 1683 else 1684 skb_queue_splice_tail_init(skbs, 1685 &local->pending[q]); 1686 1687 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1688 flags); 1689 return false; 1690 } 1691 } 1692 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1693 1694 info->control.vif = vif; 1695 control.sta = sta ? &sta->sta : NULL; 1696 1697 __skb_unlink(skb, skbs); 1698 drv_tx(local, &control, skb); 1699 } 1700 1701 return true; 1702 } 1703 1704 /* 1705 * Returns false if the frame couldn't be transmitted but was queued instead. 1706 */ 1707 static bool __ieee80211_tx(struct ieee80211_local *local, 1708 struct sk_buff_head *skbs, int led_len, 1709 struct sta_info *sta, bool txpending) 1710 { 1711 struct ieee80211_tx_info *info; 1712 struct ieee80211_sub_if_data *sdata; 1713 struct ieee80211_vif *vif; 1714 struct sk_buff *skb; 1715 bool result = true; 1716 __le16 fc; 1717 1718 if (WARN_ON(skb_queue_empty(skbs))) 1719 return true; 1720 1721 skb = skb_peek(skbs); 1722 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1723 info = IEEE80211_SKB_CB(skb); 1724 sdata = vif_to_sdata(info->control.vif); 1725 if (sta && !sta->uploaded) 1726 sta = NULL; 1727 1728 switch (sdata->vif.type) { 1729 case NL80211_IFTYPE_MONITOR: 1730 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1731 vif = &sdata->vif; 1732 break; 1733 } 1734 sdata = rcu_dereference(local->monitor_sdata); 1735 if (sdata) { 1736 vif = &sdata->vif; 1737 info->hw_queue = 1738 vif->hw_queue[skb_get_queue_mapping(skb)]; 1739 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1740 ieee80211_purge_tx_queue(&local->hw, skbs); 1741 return true; 1742 } else 1743 vif = NULL; 1744 break; 1745 case NL80211_IFTYPE_AP_VLAN: 1746 sdata = container_of(sdata->bss, 1747 struct ieee80211_sub_if_data, u.ap); 1748 fallthrough; 1749 default: 1750 vif = &sdata->vif; 1751 break; 1752 } 1753 1754 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1755 1756 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1757 1758 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1759 1760 return result; 1761 } 1762 1763 /* 1764 * Invoke TX handlers, return 0 on success and non-zero if the 1765 * frame was dropped or queued. 1766 * 1767 * The handlers are split into an early and late part. The latter is everything 1768 * that can be sensitive to reordering, and will be deferred to after packets 1769 * are dequeued from the intermediate queues (when they are enabled). 1770 */ 1771 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1772 { 1773 ieee80211_tx_result res = TX_DROP; 1774 1775 #define CALL_TXH(txh) \ 1776 do { \ 1777 res = txh(tx); \ 1778 if (res != TX_CONTINUE) \ 1779 goto txh_done; \ 1780 } while (0) 1781 1782 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1783 CALL_TXH(ieee80211_tx_h_check_assoc); 1784 CALL_TXH(ieee80211_tx_h_ps_buf); 1785 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1786 CALL_TXH(ieee80211_tx_h_select_key); 1787 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1788 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1789 1790 txh_done: 1791 if (unlikely(res == TX_DROP)) { 1792 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1793 if (tx->skb) 1794 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1795 else 1796 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1797 return -1; 1798 } else if (unlikely(res == TX_QUEUED)) { 1799 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1800 return -1; 1801 } 1802 1803 return 0; 1804 } 1805 1806 /* 1807 * Late handlers can be called while the sta lock is held. Handlers that can 1808 * cause packets to be generated will cause deadlock! 1809 */ 1810 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1811 { 1812 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1813 ieee80211_tx_result res = TX_CONTINUE; 1814 1815 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1816 __skb_queue_tail(&tx->skbs, tx->skb); 1817 tx->skb = NULL; 1818 goto txh_done; 1819 } 1820 1821 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1822 CALL_TXH(ieee80211_tx_h_sequence); 1823 CALL_TXH(ieee80211_tx_h_fragment); 1824 /* handlers after fragment must be aware of tx info fragmentation! */ 1825 CALL_TXH(ieee80211_tx_h_stats); 1826 CALL_TXH(ieee80211_tx_h_encrypt); 1827 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1828 CALL_TXH(ieee80211_tx_h_calculate_duration); 1829 #undef CALL_TXH 1830 1831 txh_done: 1832 if (unlikely(res == TX_DROP)) { 1833 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1834 if (tx->skb) 1835 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1836 else 1837 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1838 return -1; 1839 } else if (unlikely(res == TX_QUEUED)) { 1840 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1841 return -1; 1842 } 1843 1844 return 0; 1845 } 1846 1847 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1848 { 1849 int r = invoke_tx_handlers_early(tx); 1850 1851 if (r) 1852 return r; 1853 return invoke_tx_handlers_late(tx); 1854 } 1855 1856 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1857 struct ieee80211_vif *vif, struct sk_buff *skb, 1858 int band, struct ieee80211_sta **sta) 1859 { 1860 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1861 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1862 struct ieee80211_tx_data tx; 1863 struct sk_buff *skb2; 1864 1865 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1866 return false; 1867 1868 info->band = band; 1869 info->control.vif = vif; 1870 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1871 1872 if (invoke_tx_handlers(&tx)) 1873 return false; 1874 1875 if (sta) { 1876 if (tx.sta) 1877 *sta = &tx.sta->sta; 1878 else 1879 *sta = NULL; 1880 } 1881 1882 /* this function isn't suitable for fragmented data frames */ 1883 skb2 = __skb_dequeue(&tx.skbs); 1884 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1885 ieee80211_free_txskb(hw, skb2); 1886 ieee80211_purge_tx_queue(hw, &tx.skbs); 1887 return false; 1888 } 1889 1890 return true; 1891 } 1892 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1893 1894 /* 1895 * Returns false if the frame couldn't be transmitted but was queued instead. 1896 */ 1897 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1898 struct sta_info *sta, struct sk_buff *skb, 1899 bool txpending) 1900 { 1901 struct ieee80211_local *local = sdata->local; 1902 struct ieee80211_tx_data tx; 1903 ieee80211_tx_result res_prepare; 1904 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1905 bool result = true; 1906 int led_len; 1907 1908 if (unlikely(skb->len < 10)) { 1909 dev_kfree_skb(skb); 1910 return true; 1911 } 1912 1913 /* initialises tx */ 1914 led_len = skb->len; 1915 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1916 1917 if (unlikely(res_prepare == TX_DROP)) { 1918 ieee80211_free_txskb(&local->hw, skb); 1919 return true; 1920 } else if (unlikely(res_prepare == TX_QUEUED)) { 1921 return true; 1922 } 1923 1924 /* set up hw_queue value early */ 1925 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1926 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1927 info->hw_queue = 1928 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1929 1930 if (invoke_tx_handlers_early(&tx)) 1931 return true; 1932 1933 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1934 return true; 1935 1936 if (!invoke_tx_handlers_late(&tx)) 1937 result = __ieee80211_tx(local, &tx.skbs, led_len, 1938 tx.sta, txpending); 1939 1940 return result; 1941 } 1942 1943 /* device xmit handlers */ 1944 1945 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1946 struct sk_buff *skb, 1947 int head_need, bool may_encrypt) 1948 { 1949 struct ieee80211_local *local = sdata->local; 1950 struct ieee80211_hdr *hdr; 1951 bool enc_tailroom; 1952 int tail_need = 0; 1953 1954 hdr = (struct ieee80211_hdr *) skb->data; 1955 enc_tailroom = may_encrypt && 1956 (sdata->crypto_tx_tailroom_needed_cnt || 1957 ieee80211_is_mgmt(hdr->frame_control)); 1958 1959 if (enc_tailroom) { 1960 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1961 tail_need -= skb_tailroom(skb); 1962 tail_need = max_t(int, tail_need, 0); 1963 } 1964 1965 if (skb_cloned(skb) && 1966 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1967 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1968 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1969 else if (head_need || tail_need) 1970 I802_DEBUG_INC(local->tx_expand_skb_head); 1971 else 1972 return 0; 1973 1974 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1975 wiphy_debug(local->hw.wiphy, 1976 "failed to reallocate TX buffer\n"); 1977 return -ENOMEM; 1978 } 1979 1980 return 0; 1981 } 1982 1983 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1984 struct sta_info *sta, struct sk_buff *skb) 1985 { 1986 struct ieee80211_local *local = sdata->local; 1987 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1988 struct ieee80211_hdr *hdr; 1989 int headroom; 1990 bool may_encrypt; 1991 1992 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1993 1994 headroom = local->tx_headroom; 1995 if (may_encrypt) 1996 headroom += sdata->encrypt_headroom; 1997 headroom -= skb_headroom(skb); 1998 headroom = max_t(int, 0, headroom); 1999 2000 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 2001 ieee80211_free_txskb(&local->hw, skb); 2002 return; 2003 } 2004 2005 hdr = (struct ieee80211_hdr *) skb->data; 2006 info->control.vif = &sdata->vif; 2007 2008 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2009 if (ieee80211_is_data(hdr->frame_control) && 2010 is_unicast_ether_addr(hdr->addr1)) { 2011 if (mesh_nexthop_resolve(sdata, skb)) 2012 return; /* skb queued: don't free */ 2013 } else { 2014 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2015 } 2016 } 2017 2018 ieee80211_set_qos_hdr(sdata, skb); 2019 ieee80211_tx(sdata, sta, skb, false); 2020 } 2021 2022 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2023 struct net_device *dev) 2024 { 2025 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2026 struct ieee80211_radiotap_iterator iterator; 2027 struct ieee80211_radiotap_header *rthdr = 2028 (struct ieee80211_radiotap_header *) skb->data; 2029 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2030 struct ieee80211_supported_band *sband = 2031 local->hw.wiphy->bands[info->band]; 2032 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2033 NULL); 2034 u16 txflags; 2035 u16 rate = 0; 2036 bool rate_found = false; 2037 u8 rate_retries = 0; 2038 u16 rate_flags = 0; 2039 u8 mcs_known, mcs_flags, mcs_bw; 2040 u16 vht_known; 2041 u8 vht_mcs = 0, vht_nss = 0; 2042 int i; 2043 2044 /* check for not even having the fixed radiotap header part */ 2045 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2046 return false; /* too short to be possibly valid */ 2047 2048 /* is it a header version we can trust to find length from? */ 2049 if (unlikely(rthdr->it_version)) 2050 return false; /* only version 0 is supported */ 2051 2052 /* does the skb contain enough to deliver on the alleged length? */ 2053 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2054 return false; /* skb too short for claimed rt header extent */ 2055 2056 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2057 IEEE80211_TX_CTL_DONTFRAG; 2058 2059 /* 2060 * for every radiotap entry that is present 2061 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2062 * entries present, or -EINVAL on error) 2063 */ 2064 2065 while (!ret) { 2066 ret = ieee80211_radiotap_iterator_next(&iterator); 2067 2068 if (ret) 2069 continue; 2070 2071 /* see if this argument is something we can use */ 2072 switch (iterator.this_arg_index) { 2073 /* 2074 * You must take care when dereferencing iterator.this_arg 2075 * for multibyte types... the pointer is not aligned. Use 2076 * get_unaligned((type *)iterator.this_arg) to dereference 2077 * iterator.this_arg for type "type" safely on all arches. 2078 */ 2079 case IEEE80211_RADIOTAP_FLAGS: 2080 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2081 /* 2082 * this indicates that the skb we have been 2083 * handed has the 32-bit FCS CRC at the end... 2084 * we should react to that by snipping it off 2085 * because it will be recomputed and added 2086 * on transmission 2087 */ 2088 if (skb->len < (iterator._max_length + FCS_LEN)) 2089 return false; 2090 2091 skb_trim(skb, skb->len - FCS_LEN); 2092 } 2093 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2094 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2095 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2096 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2097 break; 2098 2099 case IEEE80211_RADIOTAP_TX_FLAGS: 2100 txflags = get_unaligned_le16(iterator.this_arg); 2101 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2102 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2103 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2104 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2105 break; 2106 2107 case IEEE80211_RADIOTAP_RATE: 2108 rate = *iterator.this_arg; 2109 rate_flags = 0; 2110 rate_found = true; 2111 break; 2112 2113 case IEEE80211_RADIOTAP_DATA_RETRIES: 2114 rate_retries = *iterator.this_arg; 2115 break; 2116 2117 case IEEE80211_RADIOTAP_MCS: 2118 mcs_known = iterator.this_arg[0]; 2119 mcs_flags = iterator.this_arg[1]; 2120 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2121 break; 2122 2123 rate_found = true; 2124 rate = iterator.this_arg[2]; 2125 rate_flags = IEEE80211_TX_RC_MCS; 2126 2127 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2128 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2129 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2130 2131 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2132 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2133 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2134 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2135 break; 2136 2137 case IEEE80211_RADIOTAP_VHT: 2138 vht_known = get_unaligned_le16(iterator.this_arg); 2139 rate_found = true; 2140 2141 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2142 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2143 (iterator.this_arg[2] & 2144 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2145 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2146 if (vht_known & 2147 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2148 if (iterator.this_arg[3] == 1) 2149 rate_flags |= 2150 IEEE80211_TX_RC_40_MHZ_WIDTH; 2151 else if (iterator.this_arg[3] == 4) 2152 rate_flags |= 2153 IEEE80211_TX_RC_80_MHZ_WIDTH; 2154 else if (iterator.this_arg[3] == 11) 2155 rate_flags |= 2156 IEEE80211_TX_RC_160_MHZ_WIDTH; 2157 } 2158 2159 vht_mcs = iterator.this_arg[4] >> 4; 2160 vht_nss = iterator.this_arg[4] & 0xF; 2161 break; 2162 2163 /* 2164 * Please update the file 2165 * Documentation/networking/mac80211-injection.rst 2166 * when parsing new fields here. 2167 */ 2168 2169 default: 2170 break; 2171 } 2172 } 2173 2174 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2175 return false; 2176 2177 if (rate_found) { 2178 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2179 2180 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2181 info->control.rates[i].idx = -1; 2182 info->control.rates[i].flags = 0; 2183 info->control.rates[i].count = 0; 2184 } 2185 2186 if (rate_flags & IEEE80211_TX_RC_MCS) { 2187 info->control.rates[0].idx = rate; 2188 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2189 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2190 vht_nss); 2191 } else { 2192 for (i = 0; i < sband->n_bitrates; i++) { 2193 if (rate * 5 != sband->bitrates[i].bitrate) 2194 continue; 2195 2196 info->control.rates[0].idx = i; 2197 break; 2198 } 2199 } 2200 2201 if (info->control.rates[0].idx < 0) 2202 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2203 2204 info->control.rates[0].flags = rate_flags; 2205 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2206 local->hw.max_rate_tries); 2207 } 2208 2209 return true; 2210 } 2211 2212 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2213 struct net_device *dev) 2214 { 2215 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2216 struct ieee80211_chanctx_conf *chanctx_conf; 2217 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2218 struct ieee80211_hdr *hdr; 2219 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2220 struct cfg80211_chan_def *chandef; 2221 u16 len_rthdr; 2222 int hdrlen; 2223 2224 memset(info, 0, sizeof(*info)); 2225 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2226 IEEE80211_TX_CTL_INJECTED; 2227 2228 /* Sanity-check and process the injection radiotap header */ 2229 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2230 goto fail; 2231 2232 /* we now know there is a radiotap header with a length we can use */ 2233 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2234 2235 /* 2236 * fix up the pointers accounting for the radiotap 2237 * header still being in there. We are being given 2238 * a precooked IEEE80211 header so no need for 2239 * normal processing 2240 */ 2241 skb_set_mac_header(skb, len_rthdr); 2242 /* 2243 * these are just fixed to the end of the rt area since we 2244 * don't have any better information and at this point, nobody cares 2245 */ 2246 skb_set_network_header(skb, len_rthdr); 2247 skb_set_transport_header(skb, len_rthdr); 2248 2249 if (skb->len < len_rthdr + 2) 2250 goto fail; 2251 2252 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2253 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2254 2255 if (skb->len < len_rthdr + hdrlen) 2256 goto fail; 2257 2258 /* 2259 * Initialize skb->protocol if the injected frame is a data frame 2260 * carrying a rfc1042 header 2261 */ 2262 if (ieee80211_is_data(hdr->frame_control) && 2263 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2264 u8 *payload = (u8 *)hdr + hdrlen; 2265 2266 if (ether_addr_equal(payload, rfc1042_header)) 2267 skb->protocol = cpu_to_be16((payload[6] << 8) | 2268 payload[7]); 2269 } 2270 2271 /* 2272 * Initialize skb->priority for QoS frames. This is put in the TID field 2273 * of the frame before passing it to the driver. 2274 */ 2275 if (ieee80211_is_data_qos(hdr->frame_control)) { 2276 u8 *p = ieee80211_get_qos_ctl(hdr); 2277 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 2278 } 2279 2280 rcu_read_lock(); 2281 2282 /* 2283 * We process outgoing injected frames that have a local address 2284 * we handle as though they are non-injected frames. 2285 * This code here isn't entirely correct, the local MAC address 2286 * isn't always enough to find the interface to use; for proper 2287 * VLAN/WDS support we will need a different mechanism (which 2288 * likely isn't going to be monitor interfaces). 2289 * 2290 * This is necessary, for example, for old hostapd versions that 2291 * don't use nl80211-based management TX/RX. 2292 */ 2293 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2294 2295 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2296 if (!ieee80211_sdata_running(tmp_sdata)) 2297 continue; 2298 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2299 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2300 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2301 continue; 2302 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2303 sdata = tmp_sdata; 2304 break; 2305 } 2306 } 2307 2308 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2309 if (!chanctx_conf) { 2310 tmp_sdata = rcu_dereference(local->monitor_sdata); 2311 if (tmp_sdata) 2312 chanctx_conf = 2313 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2314 } 2315 2316 if (chanctx_conf) 2317 chandef = &chanctx_conf->def; 2318 else if (!local->use_chanctx) 2319 chandef = &local->_oper_chandef; 2320 else 2321 goto fail_rcu; 2322 2323 /* 2324 * Frame injection is not allowed if beaconing is not allowed 2325 * or if we need radar detection. Beaconing is usually not allowed when 2326 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2327 * Passive scan is also used in world regulatory domains where 2328 * your country is not known and as such it should be treated as 2329 * NO TX unless the channel is explicitly allowed in which case 2330 * your current regulatory domain would not have the passive scan 2331 * flag. 2332 * 2333 * Since AP mode uses monitor interfaces to inject/TX management 2334 * frames we can make AP mode the exception to this rule once it 2335 * supports radar detection as its implementation can deal with 2336 * radar detection by itself. We can do that later by adding a 2337 * monitor flag interfaces used for AP support. 2338 */ 2339 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2340 sdata->vif.type)) 2341 goto fail_rcu; 2342 2343 info->band = chandef->chan->band; 2344 2345 /* remove the injection radiotap header */ 2346 skb_pull(skb, len_rthdr); 2347 2348 ieee80211_xmit(sdata, NULL, skb); 2349 rcu_read_unlock(); 2350 2351 return NETDEV_TX_OK; 2352 2353 fail_rcu: 2354 rcu_read_unlock(); 2355 fail: 2356 dev_kfree_skb(skb); 2357 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2358 } 2359 2360 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2361 { 2362 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2363 2364 return ethertype == ETH_P_TDLS && 2365 skb->len > 14 && 2366 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2367 } 2368 2369 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2370 struct sk_buff *skb, 2371 struct sta_info **sta_out) 2372 { 2373 struct sta_info *sta; 2374 2375 switch (sdata->vif.type) { 2376 case NL80211_IFTYPE_AP_VLAN: 2377 sta = rcu_dereference(sdata->u.vlan.sta); 2378 if (sta) { 2379 *sta_out = sta; 2380 return 0; 2381 } else if (sdata->wdev.use_4addr) { 2382 return -ENOLINK; 2383 } 2384 fallthrough; 2385 case NL80211_IFTYPE_AP: 2386 case NL80211_IFTYPE_OCB: 2387 case NL80211_IFTYPE_ADHOC: 2388 if (is_multicast_ether_addr(skb->data)) { 2389 *sta_out = ERR_PTR(-ENOENT); 2390 return 0; 2391 } 2392 sta = sta_info_get_bss(sdata, skb->data); 2393 break; 2394 case NL80211_IFTYPE_WDS: 2395 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2396 break; 2397 #ifdef CONFIG_MAC80211_MESH 2398 case NL80211_IFTYPE_MESH_POINT: 2399 /* determined much later */ 2400 *sta_out = NULL; 2401 return 0; 2402 #endif 2403 case NL80211_IFTYPE_STATION: 2404 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2405 sta = sta_info_get(sdata, skb->data); 2406 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2407 if (test_sta_flag(sta, 2408 WLAN_STA_TDLS_PEER_AUTH)) { 2409 *sta_out = sta; 2410 return 0; 2411 } 2412 2413 /* 2414 * TDLS link during setup - throw out frames to 2415 * peer. Allow TDLS-setup frames to unauthorized 2416 * peers for the special case of a link teardown 2417 * after a TDLS sta is removed due to being 2418 * unreachable. 2419 */ 2420 if (!ieee80211_is_tdls_setup(skb)) 2421 return -EINVAL; 2422 } 2423 2424 } 2425 2426 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2427 if (!sta) 2428 return -ENOLINK; 2429 break; 2430 default: 2431 return -EINVAL; 2432 } 2433 2434 *sta_out = sta ?: ERR_PTR(-ENOENT); 2435 return 0; 2436 } 2437 2438 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2439 struct sk_buff *skb, 2440 u32 *info_flags, 2441 u64 *cookie) 2442 { 2443 struct sk_buff *ack_skb; 2444 u16 info_id = 0; 2445 2446 if (skb->sk) 2447 ack_skb = skb_clone_sk(skb); 2448 else 2449 ack_skb = skb_clone(skb, GFP_ATOMIC); 2450 2451 if (ack_skb) { 2452 unsigned long flags; 2453 int id; 2454 2455 spin_lock_irqsave(&local->ack_status_lock, flags); 2456 id = idr_alloc(&local->ack_status_frames, ack_skb, 2457 1, 0x2000, GFP_ATOMIC); 2458 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2459 2460 if (id >= 0) { 2461 info_id = id; 2462 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2463 if (cookie) { 2464 *cookie = ieee80211_mgmt_tx_cookie(local); 2465 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2466 } 2467 } else { 2468 kfree_skb(ack_skb); 2469 } 2470 } 2471 2472 return info_id; 2473 } 2474 2475 /** 2476 * ieee80211_build_hdr - build 802.11 header in the given frame 2477 * @sdata: virtual interface to build the header for 2478 * @skb: the skb to build the header in 2479 * @info_flags: skb flags to set 2480 * @sta: the station pointer 2481 * @ctrl_flags: info control flags to set 2482 * @cookie: cookie pointer to fill (if not %NULL) 2483 * 2484 * This function takes the skb with 802.3 header and reformats the header to 2485 * the appropriate IEEE 802.11 header based on which interface the packet is 2486 * being transmitted on. 2487 * 2488 * Note that this function also takes care of the TX status request and 2489 * potential unsharing of the SKB - this needs to be interleaved with the 2490 * header building. 2491 * 2492 * The function requires the read-side RCU lock held 2493 * 2494 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2495 */ 2496 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2497 struct sk_buff *skb, u32 info_flags, 2498 struct sta_info *sta, u32 ctrl_flags, 2499 u64 *cookie) 2500 { 2501 struct ieee80211_local *local = sdata->local; 2502 struct ieee80211_tx_info *info; 2503 int head_need; 2504 u16 ethertype, hdrlen, meshhdrlen = 0; 2505 __le16 fc; 2506 struct ieee80211_hdr hdr; 2507 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2508 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2509 const u8 *encaps_data; 2510 int encaps_len, skip_header_bytes; 2511 bool wme_sta = false, authorized = false; 2512 bool tdls_peer; 2513 bool multicast; 2514 u16 info_id = 0; 2515 struct ieee80211_chanctx_conf *chanctx_conf; 2516 struct ieee80211_sub_if_data *ap_sdata; 2517 enum nl80211_band band; 2518 int ret; 2519 2520 if (IS_ERR(sta)) 2521 sta = NULL; 2522 2523 #ifdef CONFIG_MAC80211_DEBUGFS 2524 if (local->force_tx_status) 2525 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2526 #endif 2527 2528 /* convert Ethernet header to proper 802.11 header (based on 2529 * operation mode) */ 2530 ethertype = (skb->data[12] << 8) | skb->data[13]; 2531 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2532 2533 switch (sdata->vif.type) { 2534 case NL80211_IFTYPE_AP_VLAN: 2535 if (sdata->wdev.use_4addr) { 2536 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2537 /* RA TA DA SA */ 2538 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2539 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2540 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2541 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2542 hdrlen = 30; 2543 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2544 wme_sta = sta->sta.wme; 2545 } 2546 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2547 u.ap); 2548 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2549 if (!chanctx_conf) { 2550 ret = -ENOTCONN; 2551 goto free; 2552 } 2553 band = chanctx_conf->def.chan->band; 2554 if (sdata->wdev.use_4addr) 2555 break; 2556 fallthrough; 2557 case NL80211_IFTYPE_AP: 2558 if (sdata->vif.type == NL80211_IFTYPE_AP) 2559 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2560 if (!chanctx_conf) { 2561 ret = -ENOTCONN; 2562 goto free; 2563 } 2564 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2565 /* DA BSSID SA */ 2566 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2567 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2568 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2569 hdrlen = 24; 2570 band = chanctx_conf->def.chan->band; 2571 break; 2572 case NL80211_IFTYPE_WDS: 2573 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2574 /* RA TA DA SA */ 2575 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2576 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2577 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2578 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2579 hdrlen = 30; 2580 /* 2581 * This is the exception! WDS style interfaces are prohibited 2582 * when channel contexts are in used so this must be valid 2583 */ 2584 band = local->hw.conf.chandef.chan->band; 2585 break; 2586 #ifdef CONFIG_MAC80211_MESH 2587 case NL80211_IFTYPE_MESH_POINT: 2588 if (!is_multicast_ether_addr(skb->data)) { 2589 struct sta_info *next_hop; 2590 bool mpp_lookup = true; 2591 2592 mpath = mesh_path_lookup(sdata, skb->data); 2593 if (mpath) { 2594 mpp_lookup = false; 2595 next_hop = rcu_dereference(mpath->next_hop); 2596 if (!next_hop || 2597 !(mpath->flags & (MESH_PATH_ACTIVE | 2598 MESH_PATH_RESOLVING))) 2599 mpp_lookup = true; 2600 } 2601 2602 if (mpp_lookup) { 2603 mppath = mpp_path_lookup(sdata, skb->data); 2604 if (mppath) 2605 mppath->exp_time = jiffies; 2606 } 2607 2608 if (mppath && mpath) 2609 mesh_path_del(sdata, mpath->dst); 2610 } 2611 2612 /* 2613 * Use address extension if it is a packet from 2614 * another interface or if we know the destination 2615 * is being proxied by a portal (i.e. portal address 2616 * differs from proxied address) 2617 */ 2618 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2619 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2620 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2621 skb->data, skb->data + ETH_ALEN); 2622 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2623 NULL, NULL); 2624 } else { 2625 /* DS -> MBSS (802.11-2012 13.11.3.3). 2626 * For unicast with unknown forwarding information, 2627 * destination might be in the MBSS or if that fails 2628 * forwarded to another mesh gate. In either case 2629 * resolution will be handled in ieee80211_xmit(), so 2630 * leave the original DA. This also works for mcast */ 2631 const u8 *mesh_da = skb->data; 2632 2633 if (mppath) 2634 mesh_da = mppath->mpp; 2635 else if (mpath) 2636 mesh_da = mpath->dst; 2637 2638 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2639 mesh_da, sdata->vif.addr); 2640 if (is_multicast_ether_addr(mesh_da)) 2641 /* DA TA mSA AE:SA */ 2642 meshhdrlen = ieee80211_new_mesh_header( 2643 sdata, &mesh_hdr, 2644 skb->data + ETH_ALEN, NULL); 2645 else 2646 /* RA TA mDA mSA AE:DA SA */ 2647 meshhdrlen = ieee80211_new_mesh_header( 2648 sdata, &mesh_hdr, skb->data, 2649 skb->data + ETH_ALEN); 2650 2651 } 2652 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2653 if (!chanctx_conf) { 2654 ret = -ENOTCONN; 2655 goto free; 2656 } 2657 band = chanctx_conf->def.chan->band; 2658 2659 /* For injected frames, fill RA right away as nexthop lookup 2660 * will be skipped. 2661 */ 2662 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2663 is_zero_ether_addr(hdr.addr1)) 2664 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2665 break; 2666 #endif 2667 case NL80211_IFTYPE_STATION: 2668 /* we already did checks when looking up the RA STA */ 2669 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2670 2671 if (tdls_peer) { 2672 /* DA SA BSSID */ 2673 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2674 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2675 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2676 hdrlen = 24; 2677 } else if (sdata->u.mgd.use_4addr && 2678 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2679 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2680 IEEE80211_FCTL_TODS); 2681 /* RA TA DA SA */ 2682 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2683 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2684 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2685 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2686 hdrlen = 30; 2687 } else { 2688 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2689 /* BSSID SA DA */ 2690 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2691 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2692 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2693 hdrlen = 24; 2694 } 2695 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2696 if (!chanctx_conf) { 2697 ret = -ENOTCONN; 2698 goto free; 2699 } 2700 band = chanctx_conf->def.chan->band; 2701 break; 2702 case NL80211_IFTYPE_OCB: 2703 /* DA SA BSSID */ 2704 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2705 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2706 eth_broadcast_addr(hdr.addr3); 2707 hdrlen = 24; 2708 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2709 if (!chanctx_conf) { 2710 ret = -ENOTCONN; 2711 goto free; 2712 } 2713 band = chanctx_conf->def.chan->band; 2714 break; 2715 case NL80211_IFTYPE_ADHOC: 2716 /* DA SA BSSID */ 2717 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2718 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2719 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2720 hdrlen = 24; 2721 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2722 if (!chanctx_conf) { 2723 ret = -ENOTCONN; 2724 goto free; 2725 } 2726 band = chanctx_conf->def.chan->band; 2727 break; 2728 default: 2729 ret = -EINVAL; 2730 goto free; 2731 } 2732 2733 multicast = is_multicast_ether_addr(hdr.addr1); 2734 2735 /* sta is always NULL for mesh */ 2736 if (sta) { 2737 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2738 wme_sta = sta->sta.wme; 2739 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2740 /* For mesh, the use of the QoS header is mandatory */ 2741 wme_sta = true; 2742 } 2743 2744 /* receiver does QoS (which also means we do) use it */ 2745 if (wme_sta) { 2746 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2747 hdrlen += 2; 2748 } 2749 2750 /* 2751 * Drop unicast frames to unauthorised stations unless they are 2752 * EAPOL frames from the local station. 2753 */ 2754 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2755 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2756 !multicast && !authorized && 2757 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2758 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2759 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2760 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2761 sdata->name, hdr.addr1); 2762 #endif 2763 2764 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2765 2766 ret = -EPERM; 2767 goto free; 2768 } 2769 2770 if (unlikely(!multicast && ((skb->sk && 2771 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2772 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2773 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2774 cookie); 2775 2776 /* 2777 * If the skb is shared we need to obtain our own copy. 2778 */ 2779 if (skb_shared(skb)) { 2780 struct sk_buff *tmp_skb = skb; 2781 2782 /* can't happen -- skb is a clone if info_id != 0 */ 2783 WARN_ON(info_id); 2784 2785 skb = skb_clone(skb, GFP_ATOMIC); 2786 kfree_skb(tmp_skb); 2787 2788 if (!skb) { 2789 ret = -ENOMEM; 2790 goto free; 2791 } 2792 } 2793 2794 hdr.frame_control = fc; 2795 hdr.duration_id = 0; 2796 hdr.seq_ctrl = 0; 2797 2798 skip_header_bytes = ETH_HLEN; 2799 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2800 encaps_data = bridge_tunnel_header; 2801 encaps_len = sizeof(bridge_tunnel_header); 2802 skip_header_bytes -= 2; 2803 } else if (ethertype >= ETH_P_802_3_MIN) { 2804 encaps_data = rfc1042_header; 2805 encaps_len = sizeof(rfc1042_header); 2806 skip_header_bytes -= 2; 2807 } else { 2808 encaps_data = NULL; 2809 encaps_len = 0; 2810 } 2811 2812 skb_pull(skb, skip_header_bytes); 2813 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2814 2815 /* 2816 * So we need to modify the skb header and hence need a copy of 2817 * that. The head_need variable above doesn't, so far, include 2818 * the needed header space that we don't need right away. If we 2819 * can, then we don't reallocate right now but only after the 2820 * frame arrives at the master device (if it does...) 2821 * 2822 * If we cannot, however, then we will reallocate to include all 2823 * the ever needed space. Also, if we need to reallocate it anyway, 2824 * make it big enough for everything we may ever need. 2825 */ 2826 2827 if (head_need > 0 || skb_cloned(skb)) { 2828 head_need += sdata->encrypt_headroom; 2829 head_need += local->tx_headroom; 2830 head_need = max_t(int, 0, head_need); 2831 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2832 ieee80211_free_txskb(&local->hw, skb); 2833 skb = NULL; 2834 return ERR_PTR(-ENOMEM); 2835 } 2836 } 2837 2838 if (encaps_data) 2839 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2840 2841 #ifdef CONFIG_MAC80211_MESH 2842 if (meshhdrlen > 0) 2843 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2844 #endif 2845 2846 if (ieee80211_is_data_qos(fc)) { 2847 __le16 *qos_control; 2848 2849 qos_control = skb_push(skb, 2); 2850 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2851 /* 2852 * Maybe we could actually set some fields here, for now just 2853 * initialise to zero to indicate no special operation. 2854 */ 2855 *qos_control = 0; 2856 } else 2857 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2858 2859 skb_reset_mac_header(skb); 2860 2861 info = IEEE80211_SKB_CB(skb); 2862 memset(info, 0, sizeof(*info)); 2863 2864 info->flags = info_flags; 2865 info->ack_frame_id = info_id; 2866 info->band = band; 2867 info->control.flags = ctrl_flags; 2868 2869 return skb; 2870 free: 2871 kfree_skb(skb); 2872 return ERR_PTR(ret); 2873 } 2874 2875 /* 2876 * fast-xmit overview 2877 * 2878 * The core idea of this fast-xmit is to remove per-packet checks by checking 2879 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2880 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2881 * much less work can be done per packet. For example, fragmentation must be 2882 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2883 * in the code here. 2884 * 2885 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2886 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2887 * 2888 * The most difficult part of this is that when any of these assumptions 2889 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2890 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2891 * since the per-packet code no longer checks the conditions. This is reflected 2892 * by the calls to these functions throughout the rest of the code, and must be 2893 * maintained if any of the TX path checks change. 2894 */ 2895 2896 void ieee80211_check_fast_xmit(struct sta_info *sta) 2897 { 2898 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2899 struct ieee80211_local *local = sta->local; 2900 struct ieee80211_sub_if_data *sdata = sta->sdata; 2901 struct ieee80211_hdr *hdr = (void *)build.hdr; 2902 struct ieee80211_chanctx_conf *chanctx_conf; 2903 __le16 fc; 2904 2905 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2906 return; 2907 2908 /* Locking here protects both the pointer itself, and against concurrent 2909 * invocations winning data access races to, e.g., the key pointer that 2910 * is used. 2911 * Without it, the invocation of this function right after the key 2912 * pointer changes wouldn't be sufficient, as another CPU could access 2913 * the pointer, then stall, and then do the cache update after the CPU 2914 * that invalidated the key. 2915 * With the locking, such scenarios cannot happen as the check for the 2916 * key and the fast-tx assignment are done atomically, so the CPU that 2917 * modifies the key will either wait or other one will see the key 2918 * cleared/changed already. 2919 */ 2920 spin_lock_bh(&sta->lock); 2921 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2922 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2923 sdata->vif.type == NL80211_IFTYPE_STATION) 2924 goto out; 2925 2926 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2927 goto out; 2928 2929 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2930 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2931 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2932 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2933 goto out; 2934 2935 if (sdata->noack_map) 2936 goto out; 2937 2938 /* fast-xmit doesn't handle fragmentation at all */ 2939 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2940 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2941 goto out; 2942 2943 rcu_read_lock(); 2944 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2945 if (!chanctx_conf) { 2946 rcu_read_unlock(); 2947 goto out; 2948 } 2949 build.band = chanctx_conf->def.chan->band; 2950 rcu_read_unlock(); 2951 2952 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2953 2954 switch (sdata->vif.type) { 2955 case NL80211_IFTYPE_ADHOC: 2956 /* DA SA BSSID */ 2957 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2958 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2959 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2960 build.hdr_len = 24; 2961 break; 2962 case NL80211_IFTYPE_STATION: 2963 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2964 /* DA SA BSSID */ 2965 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2966 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2967 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2968 build.hdr_len = 24; 2969 break; 2970 } 2971 2972 if (sdata->u.mgd.use_4addr) { 2973 /* non-regular ethertype cannot use the fastpath */ 2974 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2975 IEEE80211_FCTL_TODS); 2976 /* RA TA DA SA */ 2977 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2978 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2979 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2980 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2981 build.hdr_len = 30; 2982 break; 2983 } 2984 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2985 /* BSSID SA DA */ 2986 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2987 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2988 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2989 build.hdr_len = 24; 2990 break; 2991 case NL80211_IFTYPE_AP_VLAN: 2992 if (sdata->wdev.use_4addr) { 2993 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2994 IEEE80211_FCTL_TODS); 2995 /* RA TA DA SA */ 2996 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2997 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2998 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2999 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3000 build.hdr_len = 30; 3001 break; 3002 } 3003 fallthrough; 3004 case NL80211_IFTYPE_AP: 3005 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3006 /* DA BSSID SA */ 3007 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3008 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3009 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3010 build.hdr_len = 24; 3011 break; 3012 default: 3013 /* not handled on fast-xmit */ 3014 goto out; 3015 } 3016 3017 if (sta->sta.wme) { 3018 build.hdr_len += 2; 3019 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3020 } 3021 3022 /* We store the key here so there's no point in using rcu_dereference() 3023 * but that's fine because the code that changes the pointers will call 3024 * this function after doing so. For a single CPU that would be enough, 3025 * for multiple see the comment above. 3026 */ 3027 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3028 if (!build.key) 3029 build.key = rcu_access_pointer(sdata->default_unicast_key); 3030 if (build.key) { 3031 bool gen_iv, iv_spc, mmic; 3032 3033 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3034 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3035 mmic = build.key->conf.flags & 3036 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3037 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3038 3039 /* don't handle software crypto */ 3040 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3041 goto out; 3042 3043 /* Key is being removed */ 3044 if (build.key->flags & KEY_FLAG_TAINTED) 3045 goto out; 3046 3047 switch (build.key->conf.cipher) { 3048 case WLAN_CIPHER_SUITE_CCMP: 3049 case WLAN_CIPHER_SUITE_CCMP_256: 3050 if (gen_iv) 3051 build.pn_offs = build.hdr_len; 3052 if (gen_iv || iv_spc) 3053 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3054 break; 3055 case WLAN_CIPHER_SUITE_GCMP: 3056 case WLAN_CIPHER_SUITE_GCMP_256: 3057 if (gen_iv) 3058 build.pn_offs = build.hdr_len; 3059 if (gen_iv || iv_spc) 3060 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3061 break; 3062 case WLAN_CIPHER_SUITE_TKIP: 3063 /* cannot handle MMIC or IV generation in xmit-fast */ 3064 if (mmic || gen_iv) 3065 goto out; 3066 if (iv_spc) 3067 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3068 break; 3069 case WLAN_CIPHER_SUITE_WEP40: 3070 case WLAN_CIPHER_SUITE_WEP104: 3071 /* cannot handle IV generation in fast-xmit */ 3072 if (gen_iv) 3073 goto out; 3074 if (iv_spc) 3075 build.hdr_len += IEEE80211_WEP_IV_LEN; 3076 break; 3077 case WLAN_CIPHER_SUITE_AES_CMAC: 3078 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3079 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3080 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3081 WARN(1, 3082 "management cipher suite 0x%x enabled for data\n", 3083 build.key->conf.cipher); 3084 goto out; 3085 default: 3086 /* we don't know how to generate IVs for this at all */ 3087 if (WARN_ON(gen_iv)) 3088 goto out; 3089 /* pure hardware keys are OK, of course */ 3090 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3091 break; 3092 /* cipher scheme might require space allocation */ 3093 if (iv_spc && 3094 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3095 goto out; 3096 if (iv_spc) 3097 build.hdr_len += build.key->conf.iv_len; 3098 } 3099 3100 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3101 } 3102 3103 hdr->frame_control = fc; 3104 3105 memcpy(build.hdr + build.hdr_len, 3106 rfc1042_header, sizeof(rfc1042_header)); 3107 build.hdr_len += sizeof(rfc1042_header); 3108 3109 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3110 /* if the kmemdup fails, continue w/o fast_tx */ 3111 if (!fast_tx) 3112 goto out; 3113 3114 out: 3115 /* we might have raced against another call to this function */ 3116 old = rcu_dereference_protected(sta->fast_tx, 3117 lockdep_is_held(&sta->lock)); 3118 rcu_assign_pointer(sta->fast_tx, fast_tx); 3119 if (old) 3120 kfree_rcu(old, rcu_head); 3121 spin_unlock_bh(&sta->lock); 3122 } 3123 3124 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3125 { 3126 struct sta_info *sta; 3127 3128 rcu_read_lock(); 3129 list_for_each_entry_rcu(sta, &local->sta_list, list) 3130 ieee80211_check_fast_xmit(sta); 3131 rcu_read_unlock(); 3132 } 3133 3134 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3135 { 3136 struct ieee80211_local *local = sdata->local; 3137 struct sta_info *sta; 3138 3139 rcu_read_lock(); 3140 3141 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3142 if (sdata != sta->sdata && 3143 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3144 continue; 3145 ieee80211_check_fast_xmit(sta); 3146 } 3147 3148 rcu_read_unlock(); 3149 } 3150 3151 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3152 { 3153 struct ieee80211_fast_tx *fast_tx; 3154 3155 spin_lock_bh(&sta->lock); 3156 fast_tx = rcu_dereference_protected(sta->fast_tx, 3157 lockdep_is_held(&sta->lock)); 3158 RCU_INIT_POINTER(sta->fast_tx, NULL); 3159 spin_unlock_bh(&sta->lock); 3160 3161 if (fast_tx) 3162 kfree_rcu(fast_tx, rcu_head); 3163 } 3164 3165 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3166 struct sk_buff *skb, int headroom) 3167 { 3168 if (skb_headroom(skb) < headroom) { 3169 I802_DEBUG_INC(local->tx_expand_skb_head); 3170 3171 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3172 wiphy_debug(local->hw.wiphy, 3173 "failed to reallocate TX buffer\n"); 3174 return false; 3175 } 3176 } 3177 3178 return true; 3179 } 3180 3181 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3182 struct ieee80211_fast_tx *fast_tx, 3183 struct sk_buff *skb) 3184 { 3185 struct ieee80211_local *local = sdata->local; 3186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3187 struct ieee80211_hdr *hdr; 3188 struct ethhdr *amsdu_hdr; 3189 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3190 int subframe_len = skb->len - hdr_len; 3191 void *data; 3192 u8 *qc, *h_80211_src, *h_80211_dst; 3193 const u8 *bssid; 3194 3195 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3196 return false; 3197 3198 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3199 return true; 3200 3201 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3202 return false; 3203 3204 data = skb_push(skb, sizeof(*amsdu_hdr)); 3205 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3206 hdr = data; 3207 amsdu_hdr = data + hdr_len; 3208 /* h_80211_src/dst is addr* field within hdr */ 3209 h_80211_src = data + fast_tx->sa_offs; 3210 h_80211_dst = data + fast_tx->da_offs; 3211 3212 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3213 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3214 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3215 3216 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3217 * fields needs to be changed to BSSID for A-MSDU frames depending 3218 * on FromDS/ToDS values. 3219 */ 3220 switch (sdata->vif.type) { 3221 case NL80211_IFTYPE_STATION: 3222 bssid = sdata->u.mgd.bssid; 3223 break; 3224 case NL80211_IFTYPE_AP: 3225 case NL80211_IFTYPE_AP_VLAN: 3226 bssid = sdata->vif.addr; 3227 break; 3228 default: 3229 bssid = NULL; 3230 } 3231 3232 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3233 ether_addr_copy(h_80211_src, bssid); 3234 3235 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3236 ether_addr_copy(h_80211_dst, bssid); 3237 3238 qc = ieee80211_get_qos_ctl(hdr); 3239 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3240 3241 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3242 3243 return true; 3244 } 3245 3246 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3247 struct sta_info *sta, 3248 struct ieee80211_fast_tx *fast_tx, 3249 struct sk_buff *skb) 3250 { 3251 struct ieee80211_local *local = sdata->local; 3252 struct fq *fq = &local->fq; 3253 struct fq_tin *tin; 3254 struct fq_flow *flow; 3255 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3256 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3257 struct txq_info *txqi; 3258 struct sk_buff **frag_tail, *head; 3259 int subframe_len = skb->len - ETH_ALEN; 3260 u8 max_subframes = sta->sta.max_amsdu_subframes; 3261 int max_frags = local->hw.max_tx_fragments; 3262 int max_amsdu_len = sta->sta.max_amsdu_len; 3263 int orig_truesize; 3264 u32 flow_idx; 3265 __be16 len; 3266 void *data; 3267 bool ret = false; 3268 unsigned int orig_len; 3269 int n = 2, nfrags, pad = 0; 3270 u16 hdrlen; 3271 3272 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3273 return false; 3274 3275 if (skb_is_gso(skb)) 3276 return false; 3277 3278 if (!txq) 3279 return false; 3280 3281 txqi = to_txq_info(txq); 3282 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3283 return false; 3284 3285 if (sta->sta.max_rc_amsdu_len) 3286 max_amsdu_len = min_t(int, max_amsdu_len, 3287 sta->sta.max_rc_amsdu_len); 3288 3289 if (sta->sta.max_tid_amsdu_len[tid]) 3290 max_amsdu_len = min_t(int, max_amsdu_len, 3291 sta->sta.max_tid_amsdu_len[tid]); 3292 3293 flow_idx = fq_flow_idx(fq, skb); 3294 3295 spin_lock_bh(&fq->lock); 3296 3297 /* TODO: Ideally aggregation should be done on dequeue to remain 3298 * responsive to environment changes. 3299 */ 3300 3301 tin = &txqi->tin; 3302 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3303 fq_flow_get_default_func); 3304 head = skb_peek_tail(&flow->queue); 3305 if (!head || skb_is_gso(head)) 3306 goto out; 3307 3308 orig_truesize = head->truesize; 3309 orig_len = head->len; 3310 3311 if (skb->len + head->len > max_amsdu_len) 3312 goto out; 3313 3314 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3315 nfrags += 1 + skb_shinfo(head)->nr_frags; 3316 frag_tail = &skb_shinfo(head)->frag_list; 3317 while (*frag_tail) { 3318 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3319 frag_tail = &(*frag_tail)->next; 3320 n++; 3321 } 3322 3323 if (max_subframes && n > max_subframes) 3324 goto out; 3325 3326 if (max_frags && nfrags > max_frags) 3327 goto out; 3328 3329 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3330 goto out; 3331 3332 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3333 goto out; 3334 3335 /* 3336 * Pad out the previous subframe to a multiple of 4 by adding the 3337 * padding to the next one, that's being added. Note that head->len 3338 * is the length of the full A-MSDU, but that works since each time 3339 * we add a new subframe we pad out the previous one to a multiple 3340 * of 4 and thus it no longer matters in the next round. 3341 */ 3342 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3343 if ((head->len - hdrlen) & 3) 3344 pad = 4 - ((head->len - hdrlen) & 3); 3345 3346 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3347 2 + pad)) 3348 goto out_recalc; 3349 3350 ret = true; 3351 data = skb_push(skb, ETH_ALEN + 2); 3352 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3353 3354 data += 2 * ETH_ALEN; 3355 len = cpu_to_be16(subframe_len); 3356 memcpy(data, &len, 2); 3357 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3358 3359 memset(skb_push(skb, pad), 0, pad); 3360 3361 head->len += skb->len; 3362 head->data_len += skb->len; 3363 *frag_tail = skb; 3364 3365 out_recalc: 3366 fq->memory_usage += head->truesize - orig_truesize; 3367 if (head->len != orig_len) { 3368 flow->backlog += head->len - orig_len; 3369 tin->backlog_bytes += head->len - orig_len; 3370 3371 fq_recalc_backlog(fq, tin, flow); 3372 } 3373 out: 3374 spin_unlock_bh(&fq->lock); 3375 3376 return ret; 3377 } 3378 3379 /* 3380 * Can be called while the sta lock is held. Anything that can cause packets to 3381 * be generated will cause deadlock! 3382 */ 3383 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3384 struct sta_info *sta, u8 pn_offs, 3385 struct ieee80211_key *key, 3386 struct sk_buff *skb) 3387 { 3388 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3389 struct ieee80211_hdr *hdr = (void *)skb->data; 3390 u8 tid = IEEE80211_NUM_TIDS; 3391 3392 if (key) 3393 info->control.hw_key = &key->conf; 3394 3395 ieee80211_tx_stats(skb->dev, skb->len); 3396 3397 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3398 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3399 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3400 } else { 3401 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3402 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3403 sdata->sequence_number += 0x10; 3404 } 3405 3406 if (skb_shinfo(skb)->gso_size) 3407 sta->tx_stats.msdu[tid] += 3408 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3409 else 3410 sta->tx_stats.msdu[tid]++; 3411 3412 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3413 3414 /* statistics normally done by ieee80211_tx_h_stats (but that 3415 * has to consider fragmentation, so is more complex) 3416 */ 3417 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3418 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3419 3420 if (pn_offs) { 3421 u64 pn; 3422 u8 *crypto_hdr = skb->data + pn_offs; 3423 3424 switch (key->conf.cipher) { 3425 case WLAN_CIPHER_SUITE_CCMP: 3426 case WLAN_CIPHER_SUITE_CCMP_256: 3427 case WLAN_CIPHER_SUITE_GCMP: 3428 case WLAN_CIPHER_SUITE_GCMP_256: 3429 pn = atomic64_inc_return(&key->conf.tx_pn); 3430 crypto_hdr[0] = pn; 3431 crypto_hdr[1] = pn >> 8; 3432 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3433 crypto_hdr[4] = pn >> 16; 3434 crypto_hdr[5] = pn >> 24; 3435 crypto_hdr[6] = pn >> 32; 3436 crypto_hdr[7] = pn >> 40; 3437 break; 3438 } 3439 } 3440 } 3441 3442 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3443 struct sta_info *sta, 3444 struct ieee80211_fast_tx *fast_tx, 3445 struct sk_buff *skb) 3446 { 3447 struct ieee80211_local *local = sdata->local; 3448 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3449 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3450 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3451 struct ethhdr eth; 3452 struct ieee80211_tx_info *info; 3453 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3454 struct ieee80211_tx_data tx; 3455 ieee80211_tx_result r; 3456 struct tid_ampdu_tx *tid_tx = NULL; 3457 u8 tid = IEEE80211_NUM_TIDS; 3458 3459 /* control port protocol needs a lot of special handling */ 3460 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3461 return false; 3462 3463 /* only RFC 1042 SNAP */ 3464 if (ethertype < ETH_P_802_3_MIN) 3465 return false; 3466 3467 /* don't handle TX status request here either */ 3468 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3469 return false; 3470 3471 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3472 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3473 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3474 if (tid_tx) { 3475 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3476 return false; 3477 if (tid_tx->timeout) 3478 tid_tx->last_tx = jiffies; 3479 } 3480 } 3481 3482 /* after this point (skb is modified) we cannot return false */ 3483 3484 if (skb_shared(skb)) { 3485 struct sk_buff *tmp_skb = skb; 3486 3487 skb = skb_clone(skb, GFP_ATOMIC); 3488 kfree_skb(tmp_skb); 3489 3490 if (!skb) 3491 return true; 3492 } 3493 3494 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3495 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3496 return true; 3497 3498 /* will not be crypto-handled beyond what we do here, so use false 3499 * as the may-encrypt argument for the resize to not account for 3500 * more room than we already have in 'extra_head' 3501 */ 3502 if (unlikely(ieee80211_skb_resize(sdata, skb, 3503 max_t(int, extra_head + hw_headroom - 3504 skb_headroom(skb), 0), 3505 false))) { 3506 kfree_skb(skb); 3507 return true; 3508 } 3509 3510 memcpy(ð, skb->data, ETH_HLEN - 2); 3511 hdr = skb_push(skb, extra_head); 3512 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3513 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3514 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3515 3516 info = IEEE80211_SKB_CB(skb); 3517 memset(info, 0, sizeof(*info)); 3518 info->band = fast_tx->band; 3519 info->control.vif = &sdata->vif; 3520 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3521 IEEE80211_TX_CTL_DONTFRAG | 3522 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3523 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3524 3525 #ifdef CONFIG_MAC80211_DEBUGFS 3526 if (local->force_tx_status) 3527 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3528 #endif 3529 3530 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3531 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3532 *ieee80211_get_qos_ctl(hdr) = tid; 3533 } 3534 3535 __skb_queue_head_init(&tx.skbs); 3536 3537 tx.flags = IEEE80211_TX_UNICAST; 3538 tx.local = local; 3539 tx.sdata = sdata; 3540 tx.sta = sta; 3541 tx.key = fast_tx->key; 3542 3543 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3544 tx.skb = skb; 3545 r = ieee80211_tx_h_rate_ctrl(&tx); 3546 skb = tx.skb; 3547 tx.skb = NULL; 3548 3549 if (r != TX_CONTINUE) { 3550 if (r != TX_QUEUED) 3551 kfree_skb(skb); 3552 return true; 3553 } 3554 } 3555 3556 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3557 return true; 3558 3559 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3560 fast_tx->key, skb); 3561 3562 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3563 sdata = container_of(sdata->bss, 3564 struct ieee80211_sub_if_data, u.ap); 3565 3566 __skb_queue_tail(&tx.skbs, skb); 3567 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3568 return true; 3569 } 3570 3571 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3572 struct ieee80211_txq *txq) 3573 { 3574 struct ieee80211_local *local = hw_to_local(hw); 3575 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3576 struct ieee80211_hdr *hdr; 3577 struct sk_buff *skb = NULL; 3578 struct fq *fq = &local->fq; 3579 struct fq_tin *tin = &txqi->tin; 3580 struct ieee80211_tx_info *info; 3581 struct ieee80211_tx_data tx; 3582 ieee80211_tx_result r; 3583 struct ieee80211_vif *vif = txq->vif; 3584 3585 WARN_ON_ONCE(softirq_count() == 0); 3586 3587 if (!ieee80211_txq_airtime_check(hw, txq)) 3588 return NULL; 3589 3590 begin: 3591 spin_lock_bh(&fq->lock); 3592 3593 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3594 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3595 goto out; 3596 3597 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3598 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3599 goto out; 3600 } 3601 3602 /* Make sure fragments stay together. */ 3603 skb = __skb_dequeue(&txqi->frags); 3604 if (skb) 3605 goto out; 3606 3607 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3608 if (!skb) 3609 goto out; 3610 3611 spin_unlock_bh(&fq->lock); 3612 3613 hdr = (struct ieee80211_hdr *)skb->data; 3614 info = IEEE80211_SKB_CB(skb); 3615 3616 memset(&tx, 0, sizeof(tx)); 3617 __skb_queue_head_init(&tx.skbs); 3618 tx.local = local; 3619 tx.skb = skb; 3620 tx.sdata = vif_to_sdata(info->control.vif); 3621 3622 if (txq->sta && !(info->flags & IEEE80211_TX_CTL_INJECTED)) { 3623 tx.sta = container_of(txq->sta, struct sta_info, sta); 3624 /* 3625 * Drop unicast frames to unauthorised stations unless they are 3626 * EAPOL frames from the local station. 3627 */ 3628 if (unlikely(ieee80211_is_data(hdr->frame_control) && 3629 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3630 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3631 !is_multicast_ether_addr(hdr->addr1) && 3632 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3633 (!(info->control.flags & 3634 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3635 !ether_addr_equal(tx.sdata->vif.addr, 3636 hdr->addr2)))) { 3637 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3638 ieee80211_free_txskb(&local->hw, skb); 3639 goto begin; 3640 } 3641 } 3642 3643 /* 3644 * The key can be removed while the packet was queued, so need to call 3645 * this here to get the current key. 3646 */ 3647 r = ieee80211_tx_h_select_key(&tx); 3648 if (r != TX_CONTINUE) { 3649 ieee80211_free_txskb(&local->hw, skb); 3650 goto begin; 3651 } 3652 3653 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3654 info->flags |= IEEE80211_TX_CTL_AMPDU; 3655 else 3656 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3657 3658 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 3659 goto encap_out; 3660 3661 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3662 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3663 sta); 3664 u8 pn_offs = 0; 3665 3666 if (tx.key && 3667 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3668 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3669 3670 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3671 tx.key, skb); 3672 } else { 3673 if (invoke_tx_handlers_late(&tx)) 3674 goto begin; 3675 3676 skb = __skb_dequeue(&tx.skbs); 3677 3678 if (!skb_queue_empty(&tx.skbs)) { 3679 spin_lock_bh(&fq->lock); 3680 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3681 spin_unlock_bh(&fq->lock); 3682 } 3683 } 3684 3685 if (skb_has_frag_list(skb) && 3686 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3687 if (skb_linearize(skb)) { 3688 ieee80211_free_txskb(&local->hw, skb); 3689 goto begin; 3690 } 3691 } 3692 3693 switch (tx.sdata->vif.type) { 3694 case NL80211_IFTYPE_MONITOR: 3695 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3696 vif = &tx.sdata->vif; 3697 break; 3698 } 3699 tx.sdata = rcu_dereference(local->monitor_sdata); 3700 if (tx.sdata) { 3701 vif = &tx.sdata->vif; 3702 info->hw_queue = 3703 vif->hw_queue[skb_get_queue_mapping(skb)]; 3704 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3705 ieee80211_free_txskb(&local->hw, skb); 3706 goto begin; 3707 } else { 3708 vif = NULL; 3709 } 3710 break; 3711 case NL80211_IFTYPE_AP_VLAN: 3712 tx.sdata = container_of(tx.sdata->bss, 3713 struct ieee80211_sub_if_data, u.ap); 3714 fallthrough; 3715 default: 3716 vif = &tx.sdata->vif; 3717 break; 3718 } 3719 3720 encap_out: 3721 IEEE80211_SKB_CB(skb)->control.vif = vif; 3722 3723 if (vif && 3724 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3725 bool ampdu = txq->ac != IEEE80211_AC_VO; 3726 u32 airtime; 3727 3728 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3729 skb->len, ampdu); 3730 if (airtime) { 3731 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3732 ieee80211_sta_update_pending_airtime(local, tx.sta, 3733 txq->ac, 3734 airtime, 3735 false); 3736 } 3737 } 3738 3739 return skb; 3740 3741 out: 3742 spin_unlock_bh(&fq->lock); 3743 3744 return skb; 3745 } 3746 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3747 3748 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3749 { 3750 struct ieee80211_local *local = hw_to_local(hw); 3751 struct ieee80211_txq *ret = NULL; 3752 struct txq_info *txqi = NULL, *head = NULL; 3753 bool found_eligible_txq = false; 3754 3755 spin_lock_bh(&local->active_txq_lock[ac]); 3756 3757 begin: 3758 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3759 struct txq_info, 3760 schedule_order); 3761 if (!txqi) 3762 goto out; 3763 3764 if (txqi == head) { 3765 if (!found_eligible_txq) 3766 goto out; 3767 else 3768 found_eligible_txq = false; 3769 } 3770 3771 if (!head) 3772 head = txqi; 3773 3774 if (txqi->txq.sta) { 3775 struct sta_info *sta = container_of(txqi->txq.sta, 3776 struct sta_info, sta); 3777 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3778 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3779 3780 if (aql_check) 3781 found_eligible_txq = true; 3782 3783 if (deficit < 0) 3784 sta->airtime[txqi->txq.ac].deficit += 3785 sta->airtime_weight; 3786 3787 if (deficit < 0 || !aql_check) { 3788 list_move_tail(&txqi->schedule_order, 3789 &local->active_txqs[txqi->txq.ac]); 3790 goto begin; 3791 } 3792 } 3793 3794 3795 if (txqi->schedule_round == local->schedule_round[ac]) 3796 goto out; 3797 3798 list_del_init(&txqi->schedule_order); 3799 txqi->schedule_round = local->schedule_round[ac]; 3800 ret = &txqi->txq; 3801 3802 out: 3803 spin_unlock_bh(&local->active_txq_lock[ac]); 3804 return ret; 3805 } 3806 EXPORT_SYMBOL(ieee80211_next_txq); 3807 3808 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3809 struct ieee80211_txq *txq, 3810 bool force) 3811 { 3812 struct ieee80211_local *local = hw_to_local(hw); 3813 struct txq_info *txqi = to_txq_info(txq); 3814 3815 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3816 3817 if (list_empty(&txqi->schedule_order) && 3818 (force || !skb_queue_empty(&txqi->frags) || 3819 txqi->tin.backlog_packets)) { 3820 /* If airtime accounting is active, always enqueue STAs at the 3821 * head of the list to ensure that they only get moved to the 3822 * back by the airtime DRR scheduler once they have a negative 3823 * deficit. A station that already has a negative deficit will 3824 * get immediately moved to the back of the list on the next 3825 * call to ieee80211_next_txq(). 3826 */ 3827 if (txqi->txq.sta && 3828 wiphy_ext_feature_isset(local->hw.wiphy, 3829 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3830 list_add(&txqi->schedule_order, 3831 &local->active_txqs[txq->ac]); 3832 else 3833 list_add_tail(&txqi->schedule_order, 3834 &local->active_txqs[txq->ac]); 3835 } 3836 3837 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3838 } 3839 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3840 3841 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3842 struct ieee80211_txq *txq) 3843 { 3844 struct sta_info *sta; 3845 struct ieee80211_local *local = hw_to_local(hw); 3846 3847 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3848 return true; 3849 3850 if (!txq->sta) 3851 return true; 3852 3853 sta = container_of(txq->sta, struct sta_info, sta); 3854 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3855 sta->airtime[txq->ac].aql_limit_low) 3856 return true; 3857 3858 if (atomic_read(&local->aql_total_pending_airtime) < 3859 local->aql_threshold && 3860 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3861 sta->airtime[txq->ac].aql_limit_high) 3862 return true; 3863 3864 return false; 3865 } 3866 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3867 3868 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3869 struct ieee80211_txq *txq) 3870 { 3871 struct ieee80211_local *local = hw_to_local(hw); 3872 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3873 struct sta_info *sta; 3874 u8 ac = txq->ac; 3875 3876 spin_lock_bh(&local->active_txq_lock[ac]); 3877 3878 if (!txqi->txq.sta) 3879 goto out; 3880 3881 if (list_empty(&txqi->schedule_order)) 3882 goto out; 3883 3884 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3885 schedule_order) { 3886 if (iter == txqi) 3887 break; 3888 3889 if (!iter->txq.sta) { 3890 list_move_tail(&iter->schedule_order, 3891 &local->active_txqs[ac]); 3892 continue; 3893 } 3894 sta = container_of(iter->txq.sta, struct sta_info, sta); 3895 if (sta->airtime[ac].deficit < 0) 3896 sta->airtime[ac].deficit += sta->airtime_weight; 3897 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3898 } 3899 3900 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3901 if (sta->airtime[ac].deficit >= 0) 3902 goto out; 3903 3904 sta->airtime[ac].deficit += sta->airtime_weight; 3905 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3906 spin_unlock_bh(&local->active_txq_lock[ac]); 3907 3908 return false; 3909 out: 3910 if (!list_empty(&txqi->schedule_order)) 3911 list_del_init(&txqi->schedule_order); 3912 spin_unlock_bh(&local->active_txq_lock[ac]); 3913 3914 return true; 3915 } 3916 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3917 3918 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3919 { 3920 struct ieee80211_local *local = hw_to_local(hw); 3921 3922 spin_lock_bh(&local->active_txq_lock[ac]); 3923 local->schedule_round[ac]++; 3924 spin_unlock_bh(&local->active_txq_lock[ac]); 3925 } 3926 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3927 3928 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3929 struct net_device *dev, 3930 u32 info_flags, 3931 u32 ctrl_flags, 3932 u64 *cookie) 3933 { 3934 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3935 struct ieee80211_local *local = sdata->local; 3936 struct sta_info *sta; 3937 struct sk_buff *next; 3938 3939 if (unlikely(skb->len < ETH_HLEN)) { 3940 kfree_skb(skb); 3941 return; 3942 } 3943 3944 rcu_read_lock(); 3945 3946 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3947 goto out_free; 3948 3949 if (IS_ERR(sta)) 3950 sta = NULL; 3951 3952 if (local->ops->wake_tx_queue) { 3953 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3954 skb_set_queue_mapping(skb, queue); 3955 skb_get_hash(skb); 3956 } 3957 3958 if (sta) { 3959 struct ieee80211_fast_tx *fast_tx; 3960 3961 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3962 3963 fast_tx = rcu_dereference(sta->fast_tx); 3964 3965 if (fast_tx && 3966 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3967 goto out; 3968 } 3969 3970 if (skb_is_gso(skb)) { 3971 struct sk_buff *segs; 3972 3973 segs = skb_gso_segment(skb, 0); 3974 if (IS_ERR(segs)) { 3975 goto out_free; 3976 } else if (segs) { 3977 consume_skb(skb); 3978 skb = segs; 3979 } 3980 } else { 3981 /* we cannot process non-linear frames on this path */ 3982 if (skb_linearize(skb)) { 3983 kfree_skb(skb); 3984 goto out; 3985 } 3986 3987 /* the frame could be fragmented, software-encrypted, and other 3988 * things so we cannot really handle checksum offload with it - 3989 * fix it up in software before we handle anything else. 3990 */ 3991 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3992 skb_set_transport_header(skb, 3993 skb_checksum_start_offset(skb)); 3994 if (skb_checksum_help(skb)) 3995 goto out_free; 3996 } 3997 } 3998 3999 skb_list_walk_safe(skb, skb, next) { 4000 skb_mark_not_on_list(skb); 4001 4002 if (skb->protocol == sdata->control_port_protocol) 4003 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4004 4005 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4006 sta, ctrl_flags, cookie); 4007 if (IS_ERR(skb)) { 4008 kfree_skb_list(next); 4009 goto out; 4010 } 4011 4012 ieee80211_tx_stats(dev, skb->len); 4013 4014 ieee80211_xmit(sdata, sta, skb); 4015 } 4016 goto out; 4017 out_free: 4018 kfree_skb(skb); 4019 out: 4020 rcu_read_unlock(); 4021 } 4022 4023 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4024 { 4025 struct ethhdr *eth; 4026 int err; 4027 4028 err = skb_ensure_writable(skb, ETH_HLEN); 4029 if (unlikely(err)) 4030 return err; 4031 4032 eth = (void *)skb->data; 4033 ether_addr_copy(eth->h_dest, sta->sta.addr); 4034 4035 return 0; 4036 } 4037 4038 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4039 struct net_device *dev) 4040 { 4041 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4042 const struct ethhdr *eth = (void *)skb->data; 4043 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4044 __be16 ethertype; 4045 4046 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4047 return false; 4048 4049 switch (sdata->vif.type) { 4050 case NL80211_IFTYPE_AP_VLAN: 4051 if (sdata->u.vlan.sta) 4052 return false; 4053 if (sdata->wdev.use_4addr) 4054 return false; 4055 fallthrough; 4056 case NL80211_IFTYPE_AP: 4057 /* check runtime toggle for this bss */ 4058 if (!sdata->bss->multicast_to_unicast) 4059 return false; 4060 break; 4061 default: 4062 return false; 4063 } 4064 4065 /* multicast to unicast conversion only for some payload */ 4066 ethertype = eth->h_proto; 4067 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4068 ethertype = ethvlan->h_vlan_encapsulated_proto; 4069 switch (ethertype) { 4070 case htons(ETH_P_ARP): 4071 case htons(ETH_P_IP): 4072 case htons(ETH_P_IPV6): 4073 break; 4074 default: 4075 return false; 4076 } 4077 4078 return true; 4079 } 4080 4081 static void 4082 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4083 struct sk_buff_head *queue) 4084 { 4085 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4086 struct ieee80211_local *local = sdata->local; 4087 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4088 struct sta_info *sta, *first = NULL; 4089 struct sk_buff *cloned_skb; 4090 4091 rcu_read_lock(); 4092 4093 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4094 if (sdata != sta->sdata) 4095 /* AP-VLAN mismatch */ 4096 continue; 4097 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4098 /* do not send back to source */ 4099 continue; 4100 if (!first) { 4101 first = sta; 4102 continue; 4103 } 4104 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4105 if (!cloned_skb) 4106 goto multicast; 4107 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4108 dev_kfree_skb(cloned_skb); 4109 goto multicast; 4110 } 4111 __skb_queue_tail(queue, cloned_skb); 4112 } 4113 4114 if (likely(first)) { 4115 if (unlikely(ieee80211_change_da(skb, first))) 4116 goto multicast; 4117 __skb_queue_tail(queue, skb); 4118 } else { 4119 /* no STA connected, drop */ 4120 kfree_skb(skb); 4121 skb = NULL; 4122 } 4123 4124 goto out; 4125 multicast: 4126 __skb_queue_purge(queue); 4127 __skb_queue_tail(queue, skb); 4128 out: 4129 rcu_read_unlock(); 4130 } 4131 4132 /** 4133 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4134 * @skb: packet to be sent 4135 * @dev: incoming interface 4136 * 4137 * On failure skb will be freed. 4138 */ 4139 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4140 struct net_device *dev) 4141 { 4142 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4143 struct sk_buff_head queue; 4144 4145 __skb_queue_head_init(&queue); 4146 ieee80211_convert_to_unicast(skb, dev, &queue); 4147 while ((skb = __skb_dequeue(&queue))) 4148 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4149 } else { 4150 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4151 } 4152 4153 return NETDEV_TX_OK; 4154 } 4155 4156 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4157 struct sk_buff *skb, int led_len, 4158 struct sta_info *sta, 4159 bool txpending) 4160 { 4161 struct ieee80211_local *local = sdata->local; 4162 struct ieee80211_tx_control control = {}; 4163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4164 struct ieee80211_sta *pubsta = NULL; 4165 unsigned long flags; 4166 int q = info->hw_queue; 4167 4168 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4169 return true; 4170 4171 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4172 4173 if (local->queue_stop_reasons[q] || 4174 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4175 if (txpending) 4176 skb_queue_head(&local->pending[q], skb); 4177 else 4178 skb_queue_tail(&local->pending[q], skb); 4179 4180 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4181 4182 return false; 4183 } 4184 4185 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4186 4187 if (sta && sta->uploaded) 4188 pubsta = &sta->sta; 4189 4190 control.sta = pubsta; 4191 4192 drv_tx(local, &control, skb); 4193 4194 return true; 4195 } 4196 4197 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4198 struct net_device *dev, struct sta_info *sta, 4199 struct ieee80211_key *key, struct sk_buff *skb) 4200 { 4201 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4202 struct ieee80211_local *local = sdata->local; 4203 struct tid_ampdu_tx *tid_tx; 4204 u8 tid; 4205 4206 if (local->ops->wake_tx_queue) { 4207 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4208 skb_set_queue_mapping(skb, queue); 4209 skb_get_hash(skb); 4210 } 4211 4212 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4213 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4214 goto out_free; 4215 4216 memset(info, 0, sizeof(*info)); 4217 4218 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4219 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4220 if (tid_tx) { 4221 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4222 /* fall back to non-offload slow path */ 4223 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4224 return; 4225 } 4226 4227 info->flags |= IEEE80211_TX_CTL_AMPDU; 4228 if (tid_tx->timeout) 4229 tid_tx->last_tx = jiffies; 4230 } 4231 4232 if (unlikely(skb->sk && 4233 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4234 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4235 &info->flags, NULL); 4236 4237 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4238 4239 ieee80211_tx_stats(dev, skb->len); 4240 4241 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4242 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4243 4244 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4245 sdata = container_of(sdata->bss, 4246 struct ieee80211_sub_if_data, u.ap); 4247 4248 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4249 info->control.vif = &sdata->vif; 4250 4251 if (key) 4252 info->control.hw_key = &key->conf; 4253 4254 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4255 4256 return; 4257 4258 out_free: 4259 kfree_skb(skb); 4260 } 4261 4262 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4263 struct net_device *dev) 4264 { 4265 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4266 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4267 struct ieee80211_key *key; 4268 struct sta_info *sta; 4269 bool offload = true; 4270 4271 if (unlikely(skb->len < ETH_HLEN)) { 4272 kfree_skb(skb); 4273 return NETDEV_TX_OK; 4274 } 4275 4276 rcu_read_lock(); 4277 4278 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4279 kfree_skb(skb); 4280 goto out; 4281 } 4282 4283 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4284 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4285 sdata->control_port_protocol == ehdr->h_proto)) 4286 offload = false; 4287 else if ((key = rcu_dereference(sta->ptk[sta->ptk_idx])) && 4288 (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4289 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4290 offload = false; 4291 4292 if (offload) 4293 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4294 else 4295 ieee80211_subif_start_xmit(skb, dev); 4296 4297 out: 4298 rcu_read_unlock(); 4299 4300 return NETDEV_TX_OK; 4301 } 4302 4303 struct sk_buff * 4304 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4305 struct sk_buff *skb, u32 info_flags) 4306 { 4307 struct ieee80211_hdr *hdr; 4308 struct ieee80211_tx_data tx = { 4309 .local = sdata->local, 4310 .sdata = sdata, 4311 }; 4312 struct sta_info *sta; 4313 4314 rcu_read_lock(); 4315 4316 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4317 kfree_skb(skb); 4318 skb = ERR_PTR(-EINVAL); 4319 goto out; 4320 } 4321 4322 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4323 if (IS_ERR(skb)) 4324 goto out; 4325 4326 hdr = (void *)skb->data; 4327 tx.sta = sta_info_get(sdata, hdr->addr1); 4328 tx.skb = skb; 4329 4330 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4331 rcu_read_unlock(); 4332 kfree_skb(skb); 4333 return ERR_PTR(-EINVAL); 4334 } 4335 4336 out: 4337 rcu_read_unlock(); 4338 return skb; 4339 } 4340 4341 /* 4342 * ieee80211_clear_tx_pending may not be called in a context where 4343 * it is possible that it packets could come in again. 4344 */ 4345 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4346 { 4347 struct sk_buff *skb; 4348 int i; 4349 4350 for (i = 0; i < local->hw.queues; i++) { 4351 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4352 ieee80211_free_txskb(&local->hw, skb); 4353 } 4354 } 4355 4356 /* 4357 * Returns false if the frame couldn't be transmitted but was queued instead, 4358 * which in this case means re-queued -- take as an indication to stop sending 4359 * more pending frames. 4360 */ 4361 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4362 struct sk_buff *skb) 4363 { 4364 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4365 struct ieee80211_sub_if_data *sdata; 4366 struct sta_info *sta; 4367 struct ieee80211_hdr *hdr; 4368 bool result; 4369 struct ieee80211_chanctx_conf *chanctx_conf; 4370 4371 sdata = vif_to_sdata(info->control.vif); 4372 4373 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4374 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4375 if (unlikely(!chanctx_conf)) { 4376 dev_kfree_skb(skb); 4377 return true; 4378 } 4379 info->band = chanctx_conf->def.chan->band; 4380 result = ieee80211_tx(sdata, NULL, skb, true); 4381 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4382 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4383 dev_kfree_skb(skb); 4384 return true; 4385 } 4386 4387 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4388 sta = NULL; 4389 4390 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4391 } else { 4392 struct sk_buff_head skbs; 4393 4394 __skb_queue_head_init(&skbs); 4395 __skb_queue_tail(&skbs, skb); 4396 4397 hdr = (struct ieee80211_hdr *)skb->data; 4398 sta = sta_info_get(sdata, hdr->addr1); 4399 4400 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4401 } 4402 4403 return result; 4404 } 4405 4406 /* 4407 * Transmit all pending packets. Called from tasklet. 4408 */ 4409 void ieee80211_tx_pending(unsigned long data) 4410 { 4411 struct ieee80211_local *local = (struct ieee80211_local *)data; 4412 unsigned long flags; 4413 int i; 4414 bool txok; 4415 4416 rcu_read_lock(); 4417 4418 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4419 for (i = 0; i < local->hw.queues; i++) { 4420 /* 4421 * If queue is stopped by something other than due to pending 4422 * frames, or we have no pending frames, proceed to next queue. 4423 */ 4424 if (local->queue_stop_reasons[i] || 4425 skb_queue_empty(&local->pending[i])) 4426 continue; 4427 4428 while (!skb_queue_empty(&local->pending[i])) { 4429 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4430 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4431 4432 if (WARN_ON(!info->control.vif)) { 4433 ieee80211_free_txskb(&local->hw, skb); 4434 continue; 4435 } 4436 4437 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4438 flags); 4439 4440 txok = ieee80211_tx_pending_skb(local, skb); 4441 spin_lock_irqsave(&local->queue_stop_reason_lock, 4442 flags); 4443 if (!txok) 4444 break; 4445 } 4446 4447 if (skb_queue_empty(&local->pending[i])) 4448 ieee80211_propagate_queue_wake(local, i); 4449 } 4450 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4451 4452 rcu_read_unlock(); 4453 } 4454 4455 /* functions for drivers to get certain frames */ 4456 4457 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4458 struct ps_data *ps, struct sk_buff *skb, 4459 bool is_template) 4460 { 4461 u8 *pos, *tim; 4462 int aid0 = 0; 4463 int i, have_bits = 0, n1, n2; 4464 4465 /* Generate bitmap for TIM only if there are any STAs in power save 4466 * mode. */ 4467 if (atomic_read(&ps->num_sta_ps) > 0) 4468 /* in the hope that this is faster than 4469 * checking byte-for-byte */ 4470 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4471 IEEE80211_MAX_AID+1); 4472 if (!is_template) { 4473 if (ps->dtim_count == 0) 4474 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4475 else 4476 ps->dtim_count--; 4477 } 4478 4479 tim = pos = skb_put(skb, 6); 4480 *pos++ = WLAN_EID_TIM; 4481 *pos++ = 4; 4482 *pos++ = ps->dtim_count; 4483 *pos++ = sdata->vif.bss_conf.dtim_period; 4484 4485 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4486 aid0 = 1; 4487 4488 ps->dtim_bc_mc = aid0 == 1; 4489 4490 if (have_bits) { 4491 /* Find largest even number N1 so that bits numbered 1 through 4492 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4493 * (N2 + 1) x 8 through 2007 are 0. */ 4494 n1 = 0; 4495 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4496 if (ps->tim[i]) { 4497 n1 = i & 0xfe; 4498 break; 4499 } 4500 } 4501 n2 = n1; 4502 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4503 if (ps->tim[i]) { 4504 n2 = i; 4505 break; 4506 } 4507 } 4508 4509 /* Bitmap control */ 4510 *pos++ = n1 | aid0; 4511 /* Part Virt Bitmap */ 4512 skb_put(skb, n2 - n1); 4513 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4514 4515 tim[1] = n2 - n1 + 4; 4516 } else { 4517 *pos++ = aid0; /* Bitmap control */ 4518 *pos++ = 0; /* Part Virt Bitmap */ 4519 } 4520 } 4521 4522 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4523 struct ps_data *ps, struct sk_buff *skb, 4524 bool is_template) 4525 { 4526 struct ieee80211_local *local = sdata->local; 4527 4528 /* 4529 * Not very nice, but we want to allow the driver to call 4530 * ieee80211_beacon_get() as a response to the set_tim() 4531 * callback. That, however, is already invoked under the 4532 * sta_lock to guarantee consistent and race-free update 4533 * of the tim bitmap in mac80211 and the driver. 4534 */ 4535 if (local->tim_in_locked_section) { 4536 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4537 } else { 4538 spin_lock_bh(&local->tim_lock); 4539 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4540 spin_unlock_bh(&local->tim_lock); 4541 } 4542 4543 return 0; 4544 } 4545 4546 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4547 struct beacon_data *beacon) 4548 { 4549 struct probe_resp *resp; 4550 u8 *beacon_data; 4551 size_t beacon_data_len; 4552 int i; 4553 u8 count = beacon->cntdwn_current_counter; 4554 4555 switch (sdata->vif.type) { 4556 case NL80211_IFTYPE_AP: 4557 beacon_data = beacon->tail; 4558 beacon_data_len = beacon->tail_len; 4559 break; 4560 case NL80211_IFTYPE_ADHOC: 4561 beacon_data = beacon->head; 4562 beacon_data_len = beacon->head_len; 4563 break; 4564 case NL80211_IFTYPE_MESH_POINT: 4565 beacon_data = beacon->head; 4566 beacon_data_len = beacon->head_len; 4567 break; 4568 default: 4569 return; 4570 } 4571 4572 rcu_read_lock(); 4573 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4574 resp = rcu_dereference(sdata->u.ap.probe_resp); 4575 4576 if (beacon->cntdwn_counter_offsets[i]) { 4577 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4578 beacon_data_len)) { 4579 rcu_read_unlock(); 4580 return; 4581 } 4582 4583 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4584 } 4585 4586 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4587 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4588 } 4589 rcu_read_unlock(); 4590 } 4591 4592 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4593 { 4594 beacon->cntdwn_current_counter--; 4595 4596 /* the counter should never reach 0 */ 4597 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4598 4599 return beacon->cntdwn_current_counter; 4600 } 4601 4602 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4603 { 4604 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4605 struct beacon_data *beacon = NULL; 4606 u8 count = 0; 4607 4608 rcu_read_lock(); 4609 4610 if (sdata->vif.type == NL80211_IFTYPE_AP) 4611 beacon = rcu_dereference(sdata->u.ap.beacon); 4612 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4613 beacon = rcu_dereference(sdata->u.ibss.presp); 4614 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4615 beacon = rcu_dereference(sdata->u.mesh.beacon); 4616 4617 if (!beacon) 4618 goto unlock; 4619 4620 count = __ieee80211_beacon_update_cntdwn(beacon); 4621 4622 unlock: 4623 rcu_read_unlock(); 4624 return count; 4625 } 4626 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4627 4628 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4629 { 4630 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4631 struct beacon_data *beacon = NULL; 4632 4633 rcu_read_lock(); 4634 4635 if (sdata->vif.type == NL80211_IFTYPE_AP) 4636 beacon = rcu_dereference(sdata->u.ap.beacon); 4637 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4638 beacon = rcu_dereference(sdata->u.ibss.presp); 4639 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4640 beacon = rcu_dereference(sdata->u.mesh.beacon); 4641 4642 if (!beacon) 4643 goto unlock; 4644 4645 if (counter < beacon->cntdwn_current_counter) 4646 beacon->cntdwn_current_counter = counter; 4647 4648 unlock: 4649 rcu_read_unlock(); 4650 } 4651 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4652 4653 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4654 { 4655 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4656 struct beacon_data *beacon = NULL; 4657 u8 *beacon_data; 4658 size_t beacon_data_len; 4659 int ret = false; 4660 4661 if (!ieee80211_sdata_running(sdata)) 4662 return false; 4663 4664 rcu_read_lock(); 4665 if (vif->type == NL80211_IFTYPE_AP) { 4666 struct ieee80211_if_ap *ap = &sdata->u.ap; 4667 4668 beacon = rcu_dereference(ap->beacon); 4669 if (WARN_ON(!beacon || !beacon->tail)) 4670 goto out; 4671 beacon_data = beacon->tail; 4672 beacon_data_len = beacon->tail_len; 4673 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4674 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4675 4676 beacon = rcu_dereference(ifibss->presp); 4677 if (!beacon) 4678 goto out; 4679 4680 beacon_data = beacon->head; 4681 beacon_data_len = beacon->head_len; 4682 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4683 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4684 4685 beacon = rcu_dereference(ifmsh->beacon); 4686 if (!beacon) 4687 goto out; 4688 4689 beacon_data = beacon->head; 4690 beacon_data_len = beacon->head_len; 4691 } else { 4692 WARN_ON(1); 4693 goto out; 4694 } 4695 4696 if (!beacon->cntdwn_counter_offsets[0]) 4697 goto out; 4698 4699 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4700 goto out; 4701 4702 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4703 ret = true; 4704 4705 out: 4706 rcu_read_unlock(); 4707 4708 return ret; 4709 } 4710 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4711 4712 static int ieee80211_beacon_protect(struct sk_buff *skb, 4713 struct ieee80211_local *local, 4714 struct ieee80211_sub_if_data *sdata) 4715 { 4716 ieee80211_tx_result res; 4717 struct ieee80211_tx_data tx; 4718 struct sk_buff *check_skb; 4719 4720 memset(&tx, 0, sizeof(tx)); 4721 tx.key = rcu_dereference(sdata->default_beacon_key); 4722 if (!tx.key) 4723 return 0; 4724 tx.local = local; 4725 tx.sdata = sdata; 4726 __skb_queue_head_init(&tx.skbs); 4727 __skb_queue_tail(&tx.skbs, skb); 4728 res = ieee80211_tx_h_encrypt(&tx); 4729 check_skb = __skb_dequeue(&tx.skbs); 4730 /* we may crash after this, but it'd be a bug in crypto */ 4731 WARN_ON(check_skb != skb); 4732 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4733 return -EINVAL; 4734 4735 return 0; 4736 } 4737 4738 static struct sk_buff * 4739 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4740 struct ieee80211_vif *vif, 4741 struct ieee80211_mutable_offsets *offs, 4742 bool is_template) 4743 { 4744 struct ieee80211_local *local = hw_to_local(hw); 4745 struct beacon_data *beacon = NULL; 4746 struct sk_buff *skb = NULL; 4747 struct ieee80211_tx_info *info; 4748 struct ieee80211_sub_if_data *sdata = NULL; 4749 enum nl80211_band band; 4750 struct ieee80211_tx_rate_control txrc; 4751 struct ieee80211_chanctx_conf *chanctx_conf; 4752 int csa_off_base = 0; 4753 4754 rcu_read_lock(); 4755 4756 sdata = vif_to_sdata(vif); 4757 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4758 4759 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4760 goto out; 4761 4762 if (offs) 4763 memset(offs, 0, sizeof(*offs)); 4764 4765 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4766 struct ieee80211_if_ap *ap = &sdata->u.ap; 4767 4768 beacon = rcu_dereference(ap->beacon); 4769 if (beacon) { 4770 if (beacon->cntdwn_counter_offsets[0]) { 4771 if (!is_template) 4772 ieee80211_beacon_update_cntdwn(vif); 4773 4774 ieee80211_set_beacon_cntdwn(sdata, beacon); 4775 } 4776 4777 /* 4778 * headroom, head length, 4779 * tail length and maximum TIM length 4780 */ 4781 skb = dev_alloc_skb(local->tx_headroom + 4782 beacon->head_len + 4783 beacon->tail_len + 256 + 4784 local->hw.extra_beacon_tailroom); 4785 if (!skb) 4786 goto out; 4787 4788 skb_reserve(skb, local->tx_headroom); 4789 skb_put_data(skb, beacon->head, beacon->head_len); 4790 4791 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4792 is_template); 4793 4794 if (offs) { 4795 offs->tim_offset = beacon->head_len; 4796 offs->tim_length = skb->len - beacon->head_len; 4797 4798 /* for AP the csa offsets are from tail */ 4799 csa_off_base = skb->len; 4800 } 4801 4802 if (beacon->tail) 4803 skb_put_data(skb, beacon->tail, 4804 beacon->tail_len); 4805 4806 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4807 goto out; 4808 } else 4809 goto out; 4810 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4811 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4812 struct ieee80211_hdr *hdr; 4813 4814 beacon = rcu_dereference(ifibss->presp); 4815 if (!beacon) 4816 goto out; 4817 4818 if (beacon->cntdwn_counter_offsets[0]) { 4819 if (!is_template) 4820 __ieee80211_beacon_update_cntdwn(beacon); 4821 4822 ieee80211_set_beacon_cntdwn(sdata, beacon); 4823 } 4824 4825 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4826 local->hw.extra_beacon_tailroom); 4827 if (!skb) 4828 goto out; 4829 skb_reserve(skb, local->tx_headroom); 4830 skb_put_data(skb, beacon->head, beacon->head_len); 4831 4832 hdr = (struct ieee80211_hdr *) skb->data; 4833 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4834 IEEE80211_STYPE_BEACON); 4835 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4836 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4837 4838 beacon = rcu_dereference(ifmsh->beacon); 4839 if (!beacon) 4840 goto out; 4841 4842 if (beacon->cntdwn_counter_offsets[0]) { 4843 if (!is_template) 4844 /* TODO: For mesh csa_counter is in TU, so 4845 * decrementing it by one isn't correct, but 4846 * for now we leave it consistent with overall 4847 * mac80211's behavior. 4848 */ 4849 __ieee80211_beacon_update_cntdwn(beacon); 4850 4851 ieee80211_set_beacon_cntdwn(sdata, beacon); 4852 } 4853 4854 if (ifmsh->sync_ops) 4855 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4856 4857 skb = dev_alloc_skb(local->tx_headroom + 4858 beacon->head_len + 4859 256 + /* TIM IE */ 4860 beacon->tail_len + 4861 local->hw.extra_beacon_tailroom); 4862 if (!skb) 4863 goto out; 4864 skb_reserve(skb, local->tx_headroom); 4865 skb_put_data(skb, beacon->head, beacon->head_len); 4866 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4867 4868 if (offs) { 4869 offs->tim_offset = beacon->head_len; 4870 offs->tim_length = skb->len - beacon->head_len; 4871 } 4872 4873 skb_put_data(skb, beacon->tail, beacon->tail_len); 4874 } else { 4875 WARN_ON(1); 4876 goto out; 4877 } 4878 4879 /* CSA offsets */ 4880 if (offs && beacon) { 4881 int i; 4882 4883 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4884 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 4885 4886 if (!csa_off) 4887 continue; 4888 4889 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 4890 } 4891 } 4892 4893 band = chanctx_conf->def.chan->band; 4894 4895 info = IEEE80211_SKB_CB(skb); 4896 4897 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4898 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4899 info->band = band; 4900 4901 memset(&txrc, 0, sizeof(txrc)); 4902 txrc.hw = hw; 4903 txrc.sband = local->hw.wiphy->bands[band]; 4904 txrc.bss_conf = &sdata->vif.bss_conf; 4905 txrc.skb = skb; 4906 txrc.reported_rate.idx = -1; 4907 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4908 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4909 else 4910 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4911 txrc.bss = true; 4912 rate_control_get_rate(sdata, NULL, &txrc); 4913 4914 info->control.vif = vif; 4915 4916 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4917 IEEE80211_TX_CTL_ASSIGN_SEQ | 4918 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4919 out: 4920 rcu_read_unlock(); 4921 return skb; 4922 4923 } 4924 4925 struct sk_buff * 4926 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4927 struct ieee80211_vif *vif, 4928 struct ieee80211_mutable_offsets *offs) 4929 { 4930 return __ieee80211_beacon_get(hw, vif, offs, true); 4931 } 4932 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4933 4934 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4935 struct ieee80211_vif *vif, 4936 u16 *tim_offset, u16 *tim_length) 4937 { 4938 struct ieee80211_mutable_offsets offs = {}; 4939 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4940 struct sk_buff *copy; 4941 struct ieee80211_supported_band *sband; 4942 int shift; 4943 4944 if (!bcn) 4945 return bcn; 4946 4947 if (tim_offset) 4948 *tim_offset = offs.tim_offset; 4949 4950 if (tim_length) 4951 *tim_length = offs.tim_length; 4952 4953 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4954 !hw_to_local(hw)->monitors) 4955 return bcn; 4956 4957 /* send a copy to monitor interfaces */ 4958 copy = skb_copy(bcn, GFP_ATOMIC); 4959 if (!copy) 4960 return bcn; 4961 4962 shift = ieee80211_vif_get_shift(vif); 4963 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4964 if (!sband) 4965 return bcn; 4966 4967 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4968 NULL); 4969 4970 return bcn; 4971 } 4972 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4973 4974 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4975 struct ieee80211_vif *vif) 4976 { 4977 struct ieee80211_if_ap *ap = NULL; 4978 struct sk_buff *skb = NULL; 4979 struct probe_resp *presp = NULL; 4980 struct ieee80211_hdr *hdr; 4981 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4982 4983 if (sdata->vif.type != NL80211_IFTYPE_AP) 4984 return NULL; 4985 4986 rcu_read_lock(); 4987 4988 ap = &sdata->u.ap; 4989 presp = rcu_dereference(ap->probe_resp); 4990 if (!presp) 4991 goto out; 4992 4993 skb = dev_alloc_skb(presp->len); 4994 if (!skb) 4995 goto out; 4996 4997 skb_put_data(skb, presp->data, presp->len); 4998 4999 hdr = (struct ieee80211_hdr *) skb->data; 5000 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5001 5002 out: 5003 rcu_read_unlock(); 5004 return skb; 5005 } 5006 EXPORT_SYMBOL(ieee80211_proberesp_get); 5007 5008 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5009 struct ieee80211_vif *vif) 5010 { 5011 struct sk_buff *skb = NULL; 5012 struct fils_discovery_data *tmpl = NULL; 5013 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5014 5015 if (sdata->vif.type != NL80211_IFTYPE_AP) 5016 return NULL; 5017 5018 rcu_read_lock(); 5019 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5020 if (!tmpl) { 5021 rcu_read_unlock(); 5022 return NULL; 5023 } 5024 5025 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5026 if (skb) { 5027 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5028 skb_put_data(skb, tmpl->data, tmpl->len); 5029 } 5030 5031 rcu_read_unlock(); 5032 return skb; 5033 } 5034 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5035 5036 struct sk_buff * 5037 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5038 struct ieee80211_vif *vif) 5039 { 5040 struct sk_buff *skb = NULL; 5041 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5042 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5043 5044 if (sdata->vif.type != NL80211_IFTYPE_AP) 5045 return NULL; 5046 5047 rcu_read_lock(); 5048 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5049 if (!tmpl) { 5050 rcu_read_unlock(); 5051 return NULL; 5052 } 5053 5054 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5055 if (skb) { 5056 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5057 skb_put_data(skb, tmpl->data, tmpl->len); 5058 } 5059 5060 rcu_read_unlock(); 5061 return skb; 5062 } 5063 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5064 5065 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5066 struct ieee80211_vif *vif) 5067 { 5068 struct ieee80211_sub_if_data *sdata; 5069 struct ieee80211_if_managed *ifmgd; 5070 struct ieee80211_pspoll *pspoll; 5071 struct ieee80211_local *local; 5072 struct sk_buff *skb; 5073 5074 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5075 return NULL; 5076 5077 sdata = vif_to_sdata(vif); 5078 ifmgd = &sdata->u.mgd; 5079 local = sdata->local; 5080 5081 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5082 if (!skb) 5083 return NULL; 5084 5085 skb_reserve(skb, local->hw.extra_tx_headroom); 5086 5087 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5088 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5089 IEEE80211_STYPE_PSPOLL); 5090 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5091 5092 /* aid in PS-Poll has its two MSBs each set to 1 */ 5093 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5094 5095 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5096 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5097 5098 return skb; 5099 } 5100 EXPORT_SYMBOL(ieee80211_pspoll_get); 5101 5102 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5103 struct ieee80211_vif *vif, 5104 bool qos_ok) 5105 { 5106 struct ieee80211_hdr_3addr *nullfunc; 5107 struct ieee80211_sub_if_data *sdata; 5108 struct ieee80211_if_managed *ifmgd; 5109 struct ieee80211_local *local; 5110 struct sk_buff *skb; 5111 bool qos = false; 5112 5113 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5114 return NULL; 5115 5116 sdata = vif_to_sdata(vif); 5117 ifmgd = &sdata->u.mgd; 5118 local = sdata->local; 5119 5120 if (qos_ok) { 5121 struct sta_info *sta; 5122 5123 rcu_read_lock(); 5124 sta = sta_info_get(sdata, ifmgd->bssid); 5125 qos = sta && sta->sta.wme; 5126 rcu_read_unlock(); 5127 } 5128 5129 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5130 sizeof(*nullfunc) + 2); 5131 if (!skb) 5132 return NULL; 5133 5134 skb_reserve(skb, local->hw.extra_tx_headroom); 5135 5136 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5137 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5138 IEEE80211_STYPE_NULLFUNC | 5139 IEEE80211_FCTL_TODS); 5140 if (qos) { 5141 __le16 qoshdr = cpu_to_le16(7); 5142 5143 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5144 IEEE80211_STYPE_NULLFUNC) != 5145 IEEE80211_STYPE_QOS_NULLFUNC); 5146 nullfunc->frame_control |= 5147 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5148 skb->priority = 7; 5149 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5150 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5151 } 5152 5153 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5154 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5155 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5156 5157 return skb; 5158 } 5159 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5160 5161 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5162 const u8 *src_addr, 5163 const u8 *ssid, size_t ssid_len, 5164 size_t tailroom) 5165 { 5166 struct ieee80211_local *local = hw_to_local(hw); 5167 struct ieee80211_hdr_3addr *hdr; 5168 struct sk_buff *skb; 5169 size_t ie_ssid_len; 5170 u8 *pos; 5171 5172 ie_ssid_len = 2 + ssid_len; 5173 5174 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5175 ie_ssid_len + tailroom); 5176 if (!skb) 5177 return NULL; 5178 5179 skb_reserve(skb, local->hw.extra_tx_headroom); 5180 5181 hdr = skb_put_zero(skb, sizeof(*hdr)); 5182 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5183 IEEE80211_STYPE_PROBE_REQ); 5184 eth_broadcast_addr(hdr->addr1); 5185 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5186 eth_broadcast_addr(hdr->addr3); 5187 5188 pos = skb_put(skb, ie_ssid_len); 5189 *pos++ = WLAN_EID_SSID; 5190 *pos++ = ssid_len; 5191 if (ssid_len) 5192 memcpy(pos, ssid, ssid_len); 5193 pos += ssid_len; 5194 5195 return skb; 5196 } 5197 EXPORT_SYMBOL(ieee80211_probereq_get); 5198 5199 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5200 const void *frame, size_t frame_len, 5201 const struct ieee80211_tx_info *frame_txctl, 5202 struct ieee80211_rts *rts) 5203 { 5204 const struct ieee80211_hdr *hdr = frame; 5205 5206 rts->frame_control = 5207 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5208 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5209 frame_txctl); 5210 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5211 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5212 } 5213 EXPORT_SYMBOL(ieee80211_rts_get); 5214 5215 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5216 const void *frame, size_t frame_len, 5217 const struct ieee80211_tx_info *frame_txctl, 5218 struct ieee80211_cts *cts) 5219 { 5220 const struct ieee80211_hdr *hdr = frame; 5221 5222 cts->frame_control = 5223 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5224 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5225 frame_len, frame_txctl); 5226 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5227 } 5228 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5229 5230 struct sk_buff * 5231 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5232 struct ieee80211_vif *vif) 5233 { 5234 struct ieee80211_local *local = hw_to_local(hw); 5235 struct sk_buff *skb = NULL; 5236 struct ieee80211_tx_data tx; 5237 struct ieee80211_sub_if_data *sdata; 5238 struct ps_data *ps; 5239 struct ieee80211_tx_info *info; 5240 struct ieee80211_chanctx_conf *chanctx_conf; 5241 5242 sdata = vif_to_sdata(vif); 5243 5244 rcu_read_lock(); 5245 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5246 5247 if (!chanctx_conf) 5248 goto out; 5249 5250 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5251 struct beacon_data *beacon = 5252 rcu_dereference(sdata->u.ap.beacon); 5253 5254 if (!beacon || !beacon->head) 5255 goto out; 5256 5257 ps = &sdata->u.ap.ps; 5258 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5259 ps = &sdata->u.mesh.ps; 5260 } else { 5261 goto out; 5262 } 5263 5264 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5265 goto out; /* send buffered bc/mc only after DTIM beacon */ 5266 5267 while (1) { 5268 skb = skb_dequeue(&ps->bc_buf); 5269 if (!skb) 5270 goto out; 5271 local->total_ps_buffered--; 5272 5273 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5274 struct ieee80211_hdr *hdr = 5275 (struct ieee80211_hdr *) skb->data; 5276 /* more buffered multicast/broadcast frames ==> set 5277 * MoreData flag in IEEE 802.11 header to inform PS 5278 * STAs */ 5279 hdr->frame_control |= 5280 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5281 } 5282 5283 if (sdata->vif.type == NL80211_IFTYPE_AP) 5284 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5285 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5286 break; 5287 ieee80211_free_txskb(hw, skb); 5288 } 5289 5290 info = IEEE80211_SKB_CB(skb); 5291 5292 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5293 info->band = chanctx_conf->def.chan->band; 5294 5295 if (invoke_tx_handlers(&tx)) 5296 skb = NULL; 5297 out: 5298 rcu_read_unlock(); 5299 5300 return skb; 5301 } 5302 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5303 5304 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5305 { 5306 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5307 struct ieee80211_sub_if_data *sdata = sta->sdata; 5308 struct ieee80211_local *local = sdata->local; 5309 int ret; 5310 u32 queues; 5311 5312 lockdep_assert_held(&local->sta_mtx); 5313 5314 /* only some cases are supported right now */ 5315 switch (sdata->vif.type) { 5316 case NL80211_IFTYPE_STATION: 5317 case NL80211_IFTYPE_AP: 5318 case NL80211_IFTYPE_AP_VLAN: 5319 break; 5320 default: 5321 WARN_ON(1); 5322 return -EINVAL; 5323 } 5324 5325 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5326 return -EINVAL; 5327 5328 if (sta->reserved_tid == tid) { 5329 ret = 0; 5330 goto out; 5331 } 5332 5333 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5334 sdata_err(sdata, "TID reservation already active\n"); 5335 ret = -EALREADY; 5336 goto out; 5337 } 5338 5339 ieee80211_stop_vif_queues(sdata->local, sdata, 5340 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5341 5342 synchronize_net(); 5343 5344 /* Tear down BA sessions so we stop aggregating on this TID */ 5345 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5346 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5347 __ieee80211_stop_tx_ba_session(sta, tid, 5348 AGG_STOP_LOCAL_REQUEST); 5349 } 5350 5351 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5352 __ieee80211_flush_queues(local, sdata, queues, false); 5353 5354 sta->reserved_tid = tid; 5355 5356 ieee80211_wake_vif_queues(local, sdata, 5357 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5358 5359 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5360 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5361 5362 ret = 0; 5363 out: 5364 return ret; 5365 } 5366 EXPORT_SYMBOL(ieee80211_reserve_tid); 5367 5368 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5369 { 5370 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5371 struct ieee80211_sub_if_data *sdata = sta->sdata; 5372 5373 lockdep_assert_held(&sdata->local->sta_mtx); 5374 5375 /* only some cases are supported right now */ 5376 switch (sdata->vif.type) { 5377 case NL80211_IFTYPE_STATION: 5378 case NL80211_IFTYPE_AP: 5379 case NL80211_IFTYPE_AP_VLAN: 5380 break; 5381 default: 5382 WARN_ON(1); 5383 return; 5384 } 5385 5386 if (tid != sta->reserved_tid) { 5387 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5388 return; 5389 } 5390 5391 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5392 } 5393 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5394 5395 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5396 struct sk_buff *skb, int tid, 5397 enum nl80211_band band) 5398 { 5399 int ac = ieee80211_ac_from_tid(tid); 5400 5401 skb_reset_mac_header(skb); 5402 skb_set_queue_mapping(skb, ac); 5403 skb->priority = tid; 5404 5405 skb->dev = sdata->dev; 5406 5407 /* 5408 * The other path calling ieee80211_xmit is from the tasklet, 5409 * and while we can handle concurrent transmissions locking 5410 * requirements are that we do not come into tx with bhs on. 5411 */ 5412 local_bh_disable(); 5413 IEEE80211_SKB_CB(skb)->band = band; 5414 ieee80211_xmit(sdata, NULL, skb); 5415 local_bh_enable(); 5416 } 5417 5418 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5419 const u8 *buf, size_t len, 5420 const u8 *dest, __be16 proto, bool unencrypted, 5421 u64 *cookie) 5422 { 5423 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5424 struct ieee80211_local *local = sdata->local; 5425 struct sk_buff *skb; 5426 struct ethhdr *ehdr; 5427 u32 ctrl_flags = 0; 5428 u32 flags = 0; 5429 5430 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5431 * or Pre-Authentication 5432 */ 5433 if (proto != sdata->control_port_protocol && 5434 proto != cpu_to_be16(ETH_P_PREAUTH)) 5435 return -EINVAL; 5436 5437 if (proto == sdata->control_port_protocol) 5438 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5439 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5440 5441 if (unencrypted) 5442 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5443 5444 if (cookie) 5445 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5446 5447 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX | 5448 IEEE80211_TX_CTL_INJECTED; 5449 5450 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5451 sizeof(struct ethhdr) + len); 5452 if (!skb) 5453 return -ENOMEM; 5454 5455 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5456 5457 skb_put_data(skb, buf, len); 5458 5459 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5460 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5461 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5462 ehdr->h_proto = proto; 5463 5464 skb->dev = dev; 5465 skb->protocol = htons(ETH_P_802_3); 5466 skb_reset_network_header(skb); 5467 skb_reset_mac_header(skb); 5468 5469 /* mutex lock is only needed for incrementing the cookie counter */ 5470 mutex_lock(&local->mtx); 5471 5472 local_bh_disable(); 5473 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5474 local_bh_enable(); 5475 5476 mutex_unlock(&local->mtx); 5477 5478 return 0; 5479 } 5480 5481 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5482 const u8 *buf, size_t len) 5483 { 5484 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5485 struct ieee80211_local *local = sdata->local; 5486 struct sk_buff *skb; 5487 5488 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5489 30 + /* header size */ 5490 18); /* 11s header size */ 5491 if (!skb) 5492 return -ENOMEM; 5493 5494 skb_reserve(skb, local->hw.extra_tx_headroom); 5495 skb_put_data(skb, buf, len); 5496 5497 skb->dev = dev; 5498 skb->protocol = htons(ETH_P_802_3); 5499 skb_reset_network_header(skb); 5500 skb_reset_mac_header(skb); 5501 5502 local_bh_disable(); 5503 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5504 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5505 NULL); 5506 local_bh_enable(); 5507 5508 return 0; 5509 } 5510