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) 2018-2022 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 __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 42 struct sk_buff *skb, int group_addr, 43 int next_frag_len) 44 { 45 int rate, mrate, erp, dur, i, shift = 0; 46 struct ieee80211_rate *txrate; 47 struct ieee80211_local *local = tx->local; 48 struct ieee80211_supported_band *sband; 49 struct ieee80211_hdr *hdr; 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 51 struct ieee80211_chanctx_conf *chanctx_conf; 52 u32 rate_flags = 0; 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 rcu_read_lock(); 59 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 60 if (chanctx_conf) { 61 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 } 64 rcu_read_unlock(); 65 66 /* uh huh? */ 67 if (WARN_ON_ONCE(tx->rate.idx < 0)) 68 return 0; 69 70 sband = local->hw.wiphy->bands[info->band]; 71 txrate = &sband->bitrates[tx->rate.idx]; 72 73 erp = txrate->flags & IEEE80211_RATE_ERP_G; 74 75 /* device is expected to do this */ 76 if (sband->band == NL80211_BAND_S1GHZ) 77 return 0; 78 79 /* 80 * data and mgmt (except PS Poll): 81 * - during CFP: 32768 82 * - during contention period: 83 * if addr1 is group address: 0 84 * if more fragments = 0 and addr1 is individual address: time to 85 * transmit one ACK plus SIFS 86 * if more fragments = 1 and addr1 is individual address: time to 87 * transmit next fragment plus 2 x ACK plus 3 x SIFS 88 * 89 * IEEE 802.11, 9.6: 90 * - control response frame (CTS or ACK) shall be transmitted using the 91 * same rate as the immediately previous frame in the frame exchange 92 * sequence, if this rate belongs to the PHY mandatory rates, or else 93 * at the highest possible rate belonging to the PHY rates in the 94 * BSSBasicRateSet 95 */ 96 hdr = (struct ieee80211_hdr *)skb->data; 97 if (ieee80211_is_ctl(hdr->frame_control)) { 98 /* TODO: These control frames are not currently sent by 99 * mac80211, but should they be implemented, this function 100 * needs to be updated to support duration field calculation. 101 * 102 * RTS: time needed to transmit pending data/mgmt frame plus 103 * one CTS frame plus one ACK frame plus 3 x SIFS 104 * CTS: duration of immediately previous RTS minus time 105 * required to transmit CTS and its SIFS 106 * ACK: 0 if immediately previous directed data/mgmt had 107 * more=0, with more=1 duration in ACK frame is duration 108 * from previous frame minus time needed to transmit ACK 109 * and its SIFS 110 * PS Poll: BIT(15) | BIT(14) | aid 111 */ 112 return 0; 113 } 114 115 /* data/mgmt */ 116 if (0 /* FIX: data/mgmt during CFP */) 117 return cpu_to_le16(32768); 118 119 if (group_addr) /* Group address as the destination - no ACK */ 120 return 0; 121 122 /* Individual destination address: 123 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 124 * CTS and ACK frames shall be transmitted using the highest rate in 125 * basic rate set that is less than or equal to the rate of the 126 * immediately previous frame and that is using the same modulation 127 * (CCK or OFDM). If no basic rate set matches with these requirements, 128 * the highest mandatory rate of the PHY that is less than or equal to 129 * the rate of the previous frame is used. 130 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 131 */ 132 rate = -1; 133 /* use lowest available if everything fails */ 134 mrate = sband->bitrates[0].bitrate; 135 for (i = 0; i < sband->n_bitrates; i++) { 136 struct ieee80211_rate *r = &sband->bitrates[i]; 137 138 if (r->bitrate > txrate->bitrate) 139 break; 140 141 if ((rate_flags & r->flags) != rate_flags) 142 continue; 143 144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 145 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 146 147 switch (sband->band) { 148 case NL80211_BAND_2GHZ: 149 case NL80211_BAND_LC: { 150 u32 flag; 151 if (tx->sdata->deflink.operating_11g_mode) 152 flag = IEEE80211_RATE_MANDATORY_G; 153 else 154 flag = IEEE80211_RATE_MANDATORY_B; 155 if (r->flags & flag) 156 mrate = r->bitrate; 157 break; 158 } 159 case NL80211_BAND_5GHZ: 160 case NL80211_BAND_6GHZ: 161 if (r->flags & IEEE80211_RATE_MANDATORY_A) 162 mrate = r->bitrate; 163 break; 164 case NL80211_BAND_S1GHZ: 165 case NL80211_BAND_60GHZ: 166 /* TODO, for now fall through */ 167 case NUM_NL80211_BANDS: 168 WARN_ON(1); 169 break; 170 } 171 } 172 if (rate == -1) { 173 /* No matching basic rate found; use highest suitable mandatory 174 * PHY rate */ 175 rate = DIV_ROUND_UP(mrate, 1 << shift); 176 } 177 178 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 179 if (ieee80211_is_data_qos(hdr->frame_control) && 180 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 181 dur = 0; 182 else 183 /* Time needed to transmit ACK 184 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 185 * to closest integer */ 186 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 187 tx->sdata->vif.bss_conf.use_short_preamble, 188 shift); 189 190 if (next_frag_len) { 191 /* Frame is fragmented: duration increases with time needed to 192 * transmit next fragment plus ACK and 2 x SIFS. */ 193 dur *= 2; /* ACK + SIFS */ 194 /* next fragment */ 195 dur += ieee80211_frame_duration(sband->band, next_frag_len, 196 txrate->bitrate, erp, 197 tx->sdata->vif.bss_conf.use_short_preamble, 198 shift); 199 } 200 201 return cpu_to_le16(dur); 202 } 203 204 /* tx handlers */ 205 static ieee80211_tx_result debug_noinline 206 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 207 { 208 struct ieee80211_local *local = tx->local; 209 struct ieee80211_if_managed *ifmgd; 210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 211 212 /* driver doesn't support power save */ 213 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 214 return TX_CONTINUE; 215 216 /* hardware does dynamic power save */ 217 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 218 return TX_CONTINUE; 219 220 /* dynamic power save disabled */ 221 if (local->hw.conf.dynamic_ps_timeout <= 0) 222 return TX_CONTINUE; 223 224 /* we are scanning, don't enable power save */ 225 if (local->scanning) 226 return TX_CONTINUE; 227 228 if (!local->ps_sdata) 229 return TX_CONTINUE; 230 231 /* No point if we're going to suspend */ 232 if (local->quiescing) 233 return TX_CONTINUE; 234 235 /* dynamic ps is supported only in managed mode */ 236 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 237 return TX_CONTINUE; 238 239 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 240 return TX_CONTINUE; 241 242 ifmgd = &tx->sdata->u.mgd; 243 244 /* 245 * Don't wakeup from power save if u-apsd is enabled, voip ac has 246 * u-apsd enabled and the frame is in voip class. This effectively 247 * means that even if all access categories have u-apsd enabled, in 248 * practise u-apsd is only used with the voip ac. This is a 249 * workaround for the case when received voip class packets do not 250 * have correct qos tag for some reason, due the network or the 251 * peer application. 252 * 253 * Note: ifmgd->uapsd_queues access is racy here. If the value is 254 * changed via debugfs, user needs to reassociate manually to have 255 * everything in sync. 256 */ 257 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 258 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 259 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 260 return TX_CONTINUE; 261 262 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 263 ieee80211_stop_queues_by_reason(&local->hw, 264 IEEE80211_MAX_QUEUE_MAP, 265 IEEE80211_QUEUE_STOP_REASON_PS, 266 false); 267 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 268 ieee80211_queue_work(&local->hw, 269 &local->dynamic_ps_disable_work); 270 } 271 272 /* Don't restart the timer if we're not disassociated */ 273 if (!ifmgd->associated) 274 return TX_CONTINUE; 275 276 mod_timer(&local->dynamic_ps_timer, jiffies + 277 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 278 279 return TX_CONTINUE; 280 } 281 282 static ieee80211_tx_result debug_noinline 283 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 284 { 285 286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 288 bool assoc = false; 289 290 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 291 return TX_CONTINUE; 292 293 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 294 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 295 !ieee80211_is_probe_req(hdr->frame_control) && 296 !ieee80211_is_any_nullfunc(hdr->frame_control)) 297 /* 298 * When software scanning only nullfunc frames (to notify 299 * the sleep state to the AP) and probe requests (for the 300 * active scan) are allowed, all other frames should not be 301 * sent and we should not get here, but if we do 302 * nonetheless, drop them to avoid sending them 303 * off-channel. See the link below and 304 * ieee80211_start_scan() for more. 305 * 306 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 307 */ 308 return TX_DROP; 309 310 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 311 return TX_CONTINUE; 312 313 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 314 return TX_CONTINUE; 315 316 if (tx->sta) 317 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 318 319 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 320 if (unlikely(!assoc && 321 ieee80211_is_data(hdr->frame_control))) { 322 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 323 sdata_info(tx->sdata, 324 "dropped data frame to not associated station %pM\n", 325 hdr->addr1); 326 #endif 327 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 328 return TX_DROP; 329 } 330 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 331 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 332 /* 333 * No associated STAs - no need to send multicast 334 * frames. 335 */ 336 return TX_DROP; 337 } 338 339 return TX_CONTINUE; 340 } 341 342 /* This function is called whenever the AP is about to exceed the maximum limit 343 * of buffered frames for power saving STAs. This situation should not really 344 * happen often during normal operation, so dropping the oldest buffered packet 345 * from each queue should be OK to make some room for new frames. */ 346 static void purge_old_ps_buffers(struct ieee80211_local *local) 347 { 348 int total = 0, purged = 0; 349 struct sk_buff *skb; 350 struct ieee80211_sub_if_data *sdata; 351 struct sta_info *sta; 352 353 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 354 struct ps_data *ps; 355 356 if (sdata->vif.type == NL80211_IFTYPE_AP) 357 ps = &sdata->u.ap.ps; 358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 359 ps = &sdata->u.mesh.ps; 360 else 361 continue; 362 363 skb = skb_dequeue(&ps->bc_buf); 364 if (skb) { 365 purged++; 366 ieee80211_free_txskb(&local->hw, skb); 367 } 368 total += skb_queue_len(&ps->bc_buf); 369 } 370 371 /* 372 * Drop one frame from each station from the lowest-priority 373 * AC that has frames at all. 374 */ 375 list_for_each_entry_rcu(sta, &local->sta_list, list) { 376 int ac; 377 378 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 379 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 380 total += skb_queue_len(&sta->ps_tx_buf[ac]); 381 if (skb) { 382 purged++; 383 ieee80211_free_txskb(&local->hw, skb); 384 break; 385 } 386 } 387 } 388 389 local->total_ps_buffered = total; 390 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 391 } 392 393 static ieee80211_tx_result 394 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 395 { 396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 398 struct ps_data *ps; 399 400 /* 401 * broadcast/multicast frame 402 * 403 * If any of the associated/peer stations is in power save mode, 404 * the frame is buffered to be sent after DTIM beacon frame. 405 * This is done either by the hardware or us. 406 */ 407 408 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 409 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 410 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 411 if (!tx->sdata->bss) 412 return TX_CONTINUE; 413 414 ps = &tx->sdata->bss->ps; 415 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 416 ps = &tx->sdata->u.mesh.ps; 417 } else { 418 return TX_CONTINUE; 419 } 420 421 422 /* no buffering for ordered frames */ 423 if (ieee80211_has_order(hdr->frame_control)) 424 return TX_CONTINUE; 425 426 if (ieee80211_is_probe_req(hdr->frame_control)) 427 return TX_CONTINUE; 428 429 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 430 info->hw_queue = tx->sdata->vif.cab_queue; 431 432 /* no stations in PS mode and no buffered packets */ 433 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 434 return TX_CONTINUE; 435 436 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 437 438 /* device releases frame after DTIM beacon */ 439 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 440 return TX_CONTINUE; 441 442 /* buffered in mac80211 */ 443 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 444 purge_old_ps_buffers(tx->local); 445 446 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 447 ps_dbg(tx->sdata, 448 "BC TX buffer full - dropping the oldest frame\n"); 449 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 450 } else 451 tx->local->total_ps_buffered++; 452 453 skb_queue_tail(&ps->bc_buf, tx->skb); 454 455 return TX_QUEUED; 456 } 457 458 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 459 struct sk_buff *skb) 460 { 461 if (!ieee80211_is_mgmt(fc)) 462 return 0; 463 464 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 465 return 0; 466 467 if (!ieee80211_is_robust_mgmt_frame(skb)) 468 return 0; 469 470 return 1; 471 } 472 473 static ieee80211_tx_result 474 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 475 { 476 struct sta_info *sta = tx->sta; 477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 479 struct ieee80211_local *local = tx->local; 480 481 if (unlikely(!sta)) 482 return TX_CONTINUE; 483 484 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 485 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 486 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 487 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 488 int ac = skb_get_queue_mapping(tx->skb); 489 490 if (ieee80211_is_mgmt(hdr->frame_control) && 491 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 492 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 493 return TX_CONTINUE; 494 } 495 496 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 497 sta->sta.addr, sta->sta.aid, ac); 498 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 499 purge_old_ps_buffers(tx->local); 500 501 /* sync with ieee80211_sta_ps_deliver_wakeup */ 502 spin_lock(&sta->ps_lock); 503 /* 504 * STA woke up the meantime and all the frames on ps_tx_buf have 505 * been queued to pending queue. No reordering can happen, go 506 * ahead and Tx the packet. 507 */ 508 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 509 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 510 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 511 spin_unlock(&sta->ps_lock); 512 return TX_CONTINUE; 513 } 514 515 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 516 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 517 ps_dbg(tx->sdata, 518 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 519 sta->sta.addr, ac); 520 ieee80211_free_txskb(&local->hw, old); 521 } else 522 tx->local->total_ps_buffered++; 523 524 info->control.jiffies = jiffies; 525 info->control.vif = &tx->sdata->vif; 526 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 527 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 528 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 529 spin_unlock(&sta->ps_lock); 530 531 if (!timer_pending(&local->sta_cleanup)) 532 mod_timer(&local->sta_cleanup, 533 round_jiffies(jiffies + 534 STA_INFO_CLEANUP_INTERVAL)); 535 536 /* 537 * We queued up some frames, so the TIM bit might 538 * need to be set, recalculate it. 539 */ 540 sta_info_recalc_tim(sta); 541 542 return TX_QUEUED; 543 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 544 ps_dbg(tx->sdata, 545 "STA %pM in PS mode, but polling/in SP -> send frame\n", 546 sta->sta.addr); 547 } 548 549 return TX_CONTINUE; 550 } 551 552 static ieee80211_tx_result debug_noinline 553 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 554 { 555 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 556 return TX_CONTINUE; 557 558 if (tx->flags & IEEE80211_TX_UNICAST) 559 return ieee80211_tx_h_unicast_ps_buf(tx); 560 else 561 return ieee80211_tx_h_multicast_ps_buf(tx); 562 } 563 564 static ieee80211_tx_result debug_noinline 565 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 566 { 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 569 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 570 if (tx->sdata->control_port_no_encrypt) 571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 572 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 573 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 574 } 575 576 return TX_CONTINUE; 577 } 578 579 static struct ieee80211_key * 580 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 581 { 582 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 enum { 585 USE_NONE, 586 USE_MGMT_KEY, 587 USE_MCAST_KEY, 588 } which_key = USE_NONE; 589 struct ieee80211_link_data *link; 590 unsigned int link_id; 591 592 if (ieee80211_is_group_privacy_action(tx->skb)) 593 which_key = USE_MCAST_KEY; 594 else if (ieee80211_is_mgmt(hdr->frame_control) && 595 is_multicast_ether_addr(hdr->addr1) && 596 ieee80211_is_robust_mgmt_frame(tx->skb)) 597 which_key = USE_MGMT_KEY; 598 else if (is_multicast_ether_addr(hdr->addr1)) 599 which_key = USE_MCAST_KEY; 600 else 601 return NULL; 602 603 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 604 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 605 link = &tx->sdata->deflink; 606 } else { 607 link = rcu_dereference(tx->sdata->link[link_id]); 608 if (!link) 609 return NULL; 610 } 611 612 switch (which_key) { 613 case USE_NONE: 614 break; 615 case USE_MGMT_KEY: 616 return rcu_dereference(link->default_mgmt_key); 617 case USE_MCAST_KEY: 618 return rcu_dereference(link->default_multicast_key); 619 } 620 621 return NULL; 622 } 623 624 static ieee80211_tx_result debug_noinline 625 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 626 { 627 struct ieee80211_key *key; 628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 629 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 630 631 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 632 tx->key = NULL; 633 return TX_CONTINUE; 634 } 635 636 if (tx->sta && 637 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 638 tx->key = key; 639 else if ((key = ieee80211_select_link_key(tx))) 640 tx->key = key; 641 else if (!is_multicast_ether_addr(hdr->addr1) && 642 (key = rcu_dereference(tx->sdata->default_unicast_key))) 643 tx->key = key; 644 else 645 tx->key = NULL; 646 647 if (tx->key) { 648 bool skip_hw = false; 649 650 /* TODO: add threshold stuff again */ 651 652 switch (tx->key->conf.cipher) { 653 case WLAN_CIPHER_SUITE_WEP40: 654 case WLAN_CIPHER_SUITE_WEP104: 655 case WLAN_CIPHER_SUITE_TKIP: 656 if (!ieee80211_is_data_present(hdr->frame_control)) 657 tx->key = NULL; 658 break; 659 case WLAN_CIPHER_SUITE_CCMP: 660 case WLAN_CIPHER_SUITE_CCMP_256: 661 case WLAN_CIPHER_SUITE_GCMP: 662 case WLAN_CIPHER_SUITE_GCMP_256: 663 if (!ieee80211_is_data_present(hdr->frame_control) && 664 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 665 tx->skb) && 666 !ieee80211_is_group_privacy_action(tx->skb)) 667 tx->key = NULL; 668 else 669 skip_hw = (tx->key->conf.flags & 670 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 671 ieee80211_is_mgmt(hdr->frame_control); 672 break; 673 case WLAN_CIPHER_SUITE_AES_CMAC: 674 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 675 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 676 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 677 if (!ieee80211_is_mgmt(hdr->frame_control)) 678 tx->key = NULL; 679 break; 680 } 681 682 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 683 !ieee80211_is_deauth(hdr->frame_control))) 684 return TX_DROP; 685 686 if (!skip_hw && tx->key && 687 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 688 info->control.hw_key = &tx->key->conf; 689 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 690 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 691 return TX_DROP; 692 } 693 694 return TX_CONTINUE; 695 } 696 697 static ieee80211_tx_result debug_noinline 698 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 699 { 700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 701 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 702 struct ieee80211_supported_band *sband; 703 u32 len; 704 struct ieee80211_tx_rate_control txrc; 705 struct ieee80211_sta_rates *ratetbl = NULL; 706 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 707 bool assoc = false; 708 709 memset(&txrc, 0, sizeof(txrc)); 710 711 sband = tx->local->hw.wiphy->bands[info->band]; 712 713 len = min_t(u32, tx->skb->len + FCS_LEN, 714 tx->local->hw.wiphy->frag_threshold); 715 716 /* set up the tx rate control struct we give the RC algo */ 717 txrc.hw = &tx->local->hw; 718 txrc.sband = sband; 719 txrc.bss_conf = &tx->sdata->vif.bss_conf; 720 txrc.skb = tx->skb; 721 txrc.reported_rate.idx = -1; 722 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 723 724 if (tx->sdata->rc_has_mcs_mask[info->band]) 725 txrc.rate_idx_mcs_mask = 726 tx->sdata->rc_rateidx_mcs_mask[info->band]; 727 728 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 729 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 730 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 731 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 732 733 /* set up RTS protection if desired */ 734 if (len > tx->local->hw.wiphy->rts_threshold) { 735 txrc.rts = true; 736 } 737 738 info->control.use_rts = txrc.rts; 739 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 740 741 /* 742 * Use short preamble if the BSS can handle it, but not for 743 * management frames unless we know the receiver can handle 744 * that -- the management frame might be to a station that 745 * just wants a probe response. 746 */ 747 if (tx->sdata->vif.bss_conf.use_short_preamble && 748 (ieee80211_is_tx_data(tx->skb) || 749 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 750 txrc.short_preamble = true; 751 752 info->control.short_preamble = txrc.short_preamble; 753 754 /* don't ask rate control when rate already injected via radiotap */ 755 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 756 return TX_CONTINUE; 757 758 if (tx->sta) 759 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 760 761 /* 762 * Lets not bother rate control if we're associated and cannot 763 * talk to the sta. This should not happen. 764 */ 765 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 766 !rate_usable_index_exists(sband, &tx->sta->sta), 767 "%s: Dropped data frame as no usable bitrate found while " 768 "scanning and associated. Target station: " 769 "%pM on %d GHz band\n", 770 tx->sdata->name, 771 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 772 info->band ? 5 : 2)) 773 return TX_DROP; 774 775 /* 776 * If we're associated with the sta at this point we know we can at 777 * least send the frame at the lowest bit rate. 778 */ 779 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 780 781 if (tx->sta && !info->control.skip_table) 782 ratetbl = rcu_dereference(tx->sta->sta.rates); 783 784 if (unlikely(info->control.rates[0].idx < 0)) { 785 if (ratetbl) { 786 struct ieee80211_tx_rate rate = { 787 .idx = ratetbl->rate[0].idx, 788 .flags = ratetbl->rate[0].flags, 789 .count = ratetbl->rate[0].count 790 }; 791 792 if (ratetbl->rate[0].idx < 0) 793 return TX_DROP; 794 795 tx->rate = rate; 796 } else { 797 return TX_DROP; 798 } 799 } else { 800 tx->rate = info->control.rates[0]; 801 } 802 803 if (txrc.reported_rate.idx < 0) { 804 txrc.reported_rate = tx->rate; 805 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 806 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 807 } else if (tx->sta) 808 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 809 810 if (ratetbl) 811 return TX_CONTINUE; 812 813 if (unlikely(!info->control.rates[0].count)) 814 info->control.rates[0].count = 1; 815 816 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 817 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 818 info->control.rates[0].count = 1; 819 820 return TX_CONTINUE; 821 } 822 823 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 824 { 825 u16 *seq = &sta->tid_seq[tid]; 826 __le16 ret = cpu_to_le16(*seq); 827 828 /* Increase the sequence number. */ 829 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 830 831 return ret; 832 } 833 834 static ieee80211_tx_result debug_noinline 835 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 836 { 837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 838 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 839 int tid; 840 841 /* 842 * Packet injection may want to control the sequence 843 * number, if we have no matching interface then we 844 * neither assign one ourselves nor ask the driver to. 845 */ 846 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 847 return TX_CONTINUE; 848 849 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 850 return TX_CONTINUE; 851 852 if (ieee80211_hdrlen(hdr->frame_control) < 24) 853 return TX_CONTINUE; 854 855 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 856 return TX_CONTINUE; 857 858 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 859 return TX_CONTINUE; 860 861 /* SNS11 from 802.11be 10.3.2.14 */ 862 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 863 info->control.vif->valid_links && 864 info->control.vif->type == NL80211_IFTYPE_AP)) { 865 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 866 tx->sdata->mld_mcast_seq += 0x10; 867 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 868 return TX_CONTINUE; 869 } 870 871 /* 872 * Anything but QoS data that has a sequence number field 873 * (is long enough) gets a sequence number from the global 874 * counter. QoS data frames with a multicast destination 875 * also use the global counter (802.11-2012 9.3.2.10). 876 */ 877 if (!ieee80211_is_data_qos(hdr->frame_control) || 878 is_multicast_ether_addr(hdr->addr1)) { 879 /* driver should assign sequence number */ 880 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 881 /* for pure STA mode without beacons, we can do it */ 882 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 883 tx->sdata->sequence_number += 0x10; 884 if (tx->sta) 885 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 886 return TX_CONTINUE; 887 } 888 889 /* 890 * This should be true for injected/management frames only, for 891 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 892 * above since they are not QoS-data frames. 893 */ 894 if (!tx->sta) 895 return TX_CONTINUE; 896 897 /* include per-STA, per-TID sequence counter */ 898 tid = ieee80211_get_tid(hdr); 899 tx->sta->deflink.tx_stats.msdu[tid]++; 900 901 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 902 903 return TX_CONTINUE; 904 } 905 906 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 907 struct sk_buff *skb, int hdrlen, 908 int frag_threshold) 909 { 910 struct ieee80211_local *local = tx->local; 911 struct ieee80211_tx_info *info; 912 struct sk_buff *tmp; 913 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 914 int pos = hdrlen + per_fragm; 915 int rem = skb->len - hdrlen - per_fragm; 916 917 if (WARN_ON(rem < 0)) 918 return -EINVAL; 919 920 /* first fragment was already added to queue by caller */ 921 922 while (rem) { 923 int fraglen = per_fragm; 924 925 if (fraglen > rem) 926 fraglen = rem; 927 rem -= fraglen; 928 tmp = dev_alloc_skb(local->tx_headroom + 929 frag_threshold + 930 IEEE80211_ENCRYPT_HEADROOM + 931 IEEE80211_ENCRYPT_TAILROOM); 932 if (!tmp) 933 return -ENOMEM; 934 935 __skb_queue_tail(&tx->skbs, tmp); 936 937 skb_reserve(tmp, 938 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 939 940 /* copy control information */ 941 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 942 943 info = IEEE80211_SKB_CB(tmp); 944 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 945 IEEE80211_TX_CTL_FIRST_FRAGMENT); 946 947 if (rem) 948 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 949 950 skb_copy_queue_mapping(tmp, skb); 951 tmp->priority = skb->priority; 952 tmp->dev = skb->dev; 953 954 /* copy header and data */ 955 skb_put_data(tmp, skb->data, hdrlen); 956 skb_put_data(tmp, skb->data + pos, fraglen); 957 958 pos += fraglen; 959 } 960 961 /* adjust first fragment's length */ 962 skb_trim(skb, hdrlen + per_fragm); 963 return 0; 964 } 965 966 static ieee80211_tx_result debug_noinline 967 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 968 { 969 struct sk_buff *skb = tx->skb; 970 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 971 struct ieee80211_hdr *hdr = (void *)skb->data; 972 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 973 int hdrlen; 974 int fragnum; 975 976 /* no matter what happens, tx->skb moves to tx->skbs */ 977 __skb_queue_tail(&tx->skbs, skb); 978 tx->skb = NULL; 979 980 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 981 return TX_CONTINUE; 982 983 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 984 return TX_CONTINUE; 985 986 /* 987 * Warn when submitting a fragmented A-MPDU frame and drop it. 988 * This scenario is handled in ieee80211_tx_prepare but extra 989 * caution taken here as fragmented ampdu may cause Tx stop. 990 */ 991 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 992 return TX_DROP; 993 994 hdrlen = ieee80211_hdrlen(hdr->frame_control); 995 996 /* internal error, why isn't DONTFRAG set? */ 997 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 998 return TX_DROP; 999 1000 /* 1001 * Now fragment the frame. This will allocate all the fragments and 1002 * chain them (using skb as the first fragment) to skb->next. 1003 * During transmission, we will remove the successfully transmitted 1004 * fragments from this list. When the low-level driver rejects one 1005 * of the fragments then we will simply pretend to accept the skb 1006 * but store it away as pending. 1007 */ 1008 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 1009 return TX_DROP; 1010 1011 /* update duration/seq/flags of fragments */ 1012 fragnum = 0; 1013 1014 skb_queue_walk(&tx->skbs, skb) { 1015 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1016 1017 hdr = (void *)skb->data; 1018 info = IEEE80211_SKB_CB(skb); 1019 1020 if (!skb_queue_is_last(&tx->skbs, skb)) { 1021 hdr->frame_control |= morefrags; 1022 /* 1023 * No multi-rate retries for fragmented frames, that 1024 * would completely throw off the NAV at other STAs. 1025 */ 1026 info->control.rates[1].idx = -1; 1027 info->control.rates[2].idx = -1; 1028 info->control.rates[3].idx = -1; 1029 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1030 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1031 } else { 1032 hdr->frame_control &= ~morefrags; 1033 } 1034 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1035 fragnum++; 1036 } 1037 1038 return TX_CONTINUE; 1039 } 1040 1041 static ieee80211_tx_result debug_noinline 1042 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1043 { 1044 struct sk_buff *skb; 1045 int ac = -1; 1046 1047 if (!tx->sta) 1048 return TX_CONTINUE; 1049 1050 skb_queue_walk(&tx->skbs, skb) { 1051 ac = skb_get_queue_mapping(skb); 1052 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1053 } 1054 if (ac >= 0) 1055 tx->sta->deflink.tx_stats.packets[ac]++; 1056 1057 return TX_CONTINUE; 1058 } 1059 1060 static ieee80211_tx_result debug_noinline 1061 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1062 { 1063 if (!tx->key) 1064 return TX_CONTINUE; 1065 1066 switch (tx->key->conf.cipher) { 1067 case WLAN_CIPHER_SUITE_WEP40: 1068 case WLAN_CIPHER_SUITE_WEP104: 1069 return ieee80211_crypto_wep_encrypt(tx); 1070 case WLAN_CIPHER_SUITE_TKIP: 1071 return ieee80211_crypto_tkip_encrypt(tx); 1072 case WLAN_CIPHER_SUITE_CCMP: 1073 return ieee80211_crypto_ccmp_encrypt( 1074 tx, IEEE80211_CCMP_MIC_LEN); 1075 case WLAN_CIPHER_SUITE_CCMP_256: 1076 return ieee80211_crypto_ccmp_encrypt( 1077 tx, IEEE80211_CCMP_256_MIC_LEN); 1078 case WLAN_CIPHER_SUITE_AES_CMAC: 1079 return ieee80211_crypto_aes_cmac_encrypt(tx); 1080 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1081 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1082 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1083 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1084 return ieee80211_crypto_aes_gmac_encrypt(tx); 1085 case WLAN_CIPHER_SUITE_GCMP: 1086 case WLAN_CIPHER_SUITE_GCMP_256: 1087 return ieee80211_crypto_gcmp_encrypt(tx); 1088 } 1089 1090 return TX_DROP; 1091 } 1092 1093 static ieee80211_tx_result debug_noinline 1094 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1095 { 1096 struct sk_buff *skb; 1097 struct ieee80211_hdr *hdr; 1098 int next_len; 1099 bool group_addr; 1100 1101 skb_queue_walk(&tx->skbs, skb) { 1102 hdr = (void *) skb->data; 1103 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1104 break; /* must not overwrite AID */ 1105 if (!skb_queue_is_last(&tx->skbs, skb)) { 1106 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1107 next_len = next->len; 1108 } else 1109 next_len = 0; 1110 group_addr = is_multicast_ether_addr(hdr->addr1); 1111 1112 hdr->duration_id = 1113 ieee80211_duration(tx, skb, group_addr, next_len); 1114 } 1115 1116 return TX_CONTINUE; 1117 } 1118 1119 /* actual transmit path */ 1120 1121 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1122 struct sk_buff *skb, 1123 struct ieee80211_tx_info *info, 1124 struct tid_ampdu_tx *tid_tx, 1125 int tid) 1126 { 1127 bool queued = false; 1128 bool reset_agg_timer = false; 1129 struct sk_buff *purge_skb = NULL; 1130 1131 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1132 reset_agg_timer = true; 1133 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1134 /* 1135 * nothing -- this aggregation session is being started 1136 * but that might still fail with the driver 1137 */ 1138 } else if (!tx->sta->sta.txq[tid]) { 1139 spin_lock(&tx->sta->lock); 1140 /* 1141 * Need to re-check now, because we may get here 1142 * 1143 * 1) in the window during which the setup is actually 1144 * already done, but not marked yet because not all 1145 * packets are spliced over to the driver pending 1146 * queue yet -- if this happened we acquire the lock 1147 * either before or after the splice happens, but 1148 * need to recheck which of these cases happened. 1149 * 1150 * 2) during session teardown, if the OPERATIONAL bit 1151 * was cleared due to the teardown but the pointer 1152 * hasn't been assigned NULL yet (or we loaded it 1153 * before it was assigned) -- in this case it may 1154 * now be NULL which means we should just let the 1155 * packet pass through because splicing the frames 1156 * back is already done. 1157 */ 1158 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1159 1160 if (!tid_tx) { 1161 /* do nothing, let packet pass through */ 1162 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1163 reset_agg_timer = true; 1164 } else { 1165 queued = true; 1166 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1167 clear_sta_flag(tx->sta, WLAN_STA_SP); 1168 ps_dbg(tx->sta->sdata, 1169 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1170 tx->sta->sta.addr, tx->sta->sta.aid); 1171 } 1172 info->control.vif = &tx->sdata->vif; 1173 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1174 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1175 __skb_queue_tail(&tid_tx->pending, skb); 1176 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1177 purge_skb = __skb_dequeue(&tid_tx->pending); 1178 } 1179 spin_unlock(&tx->sta->lock); 1180 1181 if (purge_skb) 1182 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1183 } 1184 1185 /* reset session timer */ 1186 if (reset_agg_timer) 1187 tid_tx->last_tx = jiffies; 1188 1189 return queued; 1190 } 1191 1192 static void 1193 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1194 struct sta_info *sta, 1195 struct sk_buff *skb) 1196 { 1197 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1198 u16 tid; 1199 1200 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1201 return; 1202 1203 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1204 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1205 skb->protocol == sdata->control_port_protocol) 1206 return; 1207 1208 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1209 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1210 return; 1211 1212 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1213 } 1214 1215 /* 1216 * initialises @tx 1217 * pass %NULL for the station if unknown, a valid pointer if known 1218 * or an ERR_PTR() if the station is known not to exist 1219 */ 1220 static ieee80211_tx_result 1221 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1222 struct ieee80211_tx_data *tx, 1223 struct sta_info *sta, struct sk_buff *skb) 1224 { 1225 struct ieee80211_local *local = sdata->local; 1226 struct ieee80211_hdr *hdr; 1227 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1228 bool aggr_check = false; 1229 int tid; 1230 1231 memset(tx, 0, sizeof(*tx)); 1232 tx->skb = skb; 1233 tx->local = local; 1234 tx->sdata = sdata; 1235 __skb_queue_head_init(&tx->skbs); 1236 1237 /* 1238 * If this flag is set to true anywhere, and we get here, 1239 * we are doing the needed processing, so remove the flag 1240 * now. 1241 */ 1242 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1243 1244 hdr = (struct ieee80211_hdr *) skb->data; 1245 1246 if (likely(sta)) { 1247 if (!IS_ERR(sta)) 1248 tx->sta = sta; 1249 } else { 1250 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1251 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1252 if (!tx->sta && sdata->wdev.use_4addr) 1253 return TX_DROP; 1254 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1255 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1256 } 1257 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1258 tx->sta = sta_info_get(sdata, hdr->addr1); 1259 aggr_check = true; 1260 } 1261 } 1262 1263 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1264 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1265 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1266 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1267 struct tid_ampdu_tx *tid_tx; 1268 1269 tid = ieee80211_get_tid(hdr); 1270 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1271 if (!tid_tx && aggr_check) { 1272 ieee80211_aggr_check(sdata, tx->sta, skb); 1273 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1274 } 1275 1276 if (tid_tx) { 1277 bool queued; 1278 1279 queued = ieee80211_tx_prep_agg(tx, skb, info, 1280 tid_tx, tid); 1281 1282 if (unlikely(queued)) 1283 return TX_QUEUED; 1284 } 1285 } 1286 1287 if (is_multicast_ether_addr(hdr->addr1)) { 1288 tx->flags &= ~IEEE80211_TX_UNICAST; 1289 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1290 } else 1291 tx->flags |= IEEE80211_TX_UNICAST; 1292 1293 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1294 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1295 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1296 info->flags & IEEE80211_TX_CTL_AMPDU) 1297 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1298 } 1299 1300 if (!tx->sta) 1301 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1302 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1303 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1304 ieee80211_check_fast_xmit(tx->sta); 1305 } 1306 1307 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1308 1309 return TX_CONTINUE; 1310 } 1311 1312 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1313 struct ieee80211_vif *vif, 1314 struct sta_info *sta, 1315 struct sk_buff *skb) 1316 { 1317 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1318 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1319 struct ieee80211_txq *txq = NULL; 1320 1321 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1322 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1323 return NULL; 1324 1325 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1326 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1327 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1328 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1329 vif->type == NL80211_IFTYPE_STATION) && 1330 sta && sta->uploaded) { 1331 /* 1332 * This will be NULL if the driver didn't set the 1333 * opt-in hardware flag. 1334 */ 1335 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1336 } 1337 } else if (sta) { 1338 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1339 1340 if (!sta->uploaded) 1341 return NULL; 1342 1343 txq = sta->sta.txq[tid]; 1344 } else { 1345 txq = vif->txq; 1346 } 1347 1348 if (!txq) 1349 return NULL; 1350 1351 return to_txq_info(txq); 1352 } 1353 1354 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1355 { 1356 struct sk_buff *next; 1357 codel_time_t now = codel_get_time(); 1358 1359 skb_list_walk_safe(skb, skb, next) 1360 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1361 } 1362 1363 static u32 codel_skb_len_func(const struct sk_buff *skb) 1364 { 1365 return skb->len; 1366 } 1367 1368 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1369 { 1370 const struct ieee80211_tx_info *info; 1371 1372 info = (const struct ieee80211_tx_info *)skb->cb; 1373 return info->control.enqueue_time; 1374 } 1375 1376 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1377 void *ctx) 1378 { 1379 struct ieee80211_local *local; 1380 struct txq_info *txqi; 1381 struct fq *fq; 1382 struct fq_flow *flow; 1383 1384 txqi = ctx; 1385 local = vif_to_sdata(txqi->txq.vif)->local; 1386 fq = &local->fq; 1387 1388 if (cvars == &txqi->def_cvars) 1389 flow = &txqi->tin.default_flow; 1390 else 1391 flow = &fq->flows[cvars - local->cvars]; 1392 1393 return fq_flow_dequeue(fq, flow); 1394 } 1395 1396 static void codel_drop_func(struct sk_buff *skb, 1397 void *ctx) 1398 { 1399 struct ieee80211_local *local; 1400 struct ieee80211_hw *hw; 1401 struct txq_info *txqi; 1402 1403 txqi = ctx; 1404 local = vif_to_sdata(txqi->txq.vif)->local; 1405 hw = &local->hw; 1406 1407 ieee80211_free_txskb(hw, skb); 1408 } 1409 1410 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1411 struct fq_tin *tin, 1412 struct fq_flow *flow) 1413 { 1414 struct ieee80211_local *local; 1415 struct txq_info *txqi; 1416 struct codel_vars *cvars; 1417 struct codel_params *cparams; 1418 struct codel_stats *cstats; 1419 1420 local = container_of(fq, struct ieee80211_local, fq); 1421 txqi = container_of(tin, struct txq_info, tin); 1422 cstats = &txqi->cstats; 1423 1424 if (txqi->txq.sta) { 1425 struct sta_info *sta = container_of(txqi->txq.sta, 1426 struct sta_info, sta); 1427 cparams = &sta->cparams; 1428 } else { 1429 cparams = &local->cparams; 1430 } 1431 1432 if (flow == &tin->default_flow) 1433 cvars = &txqi->def_cvars; 1434 else 1435 cvars = &local->cvars[flow - fq->flows]; 1436 1437 return codel_dequeue(txqi, 1438 &flow->backlog, 1439 cparams, 1440 cvars, 1441 cstats, 1442 codel_skb_len_func, 1443 codel_skb_time_func, 1444 codel_drop_func, 1445 codel_dequeue_func); 1446 } 1447 1448 static void fq_skb_free_func(struct fq *fq, 1449 struct fq_tin *tin, 1450 struct fq_flow *flow, 1451 struct sk_buff *skb) 1452 { 1453 struct ieee80211_local *local; 1454 1455 local = container_of(fq, struct ieee80211_local, fq); 1456 ieee80211_free_txskb(&local->hw, skb); 1457 } 1458 1459 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1460 struct txq_info *txqi, 1461 struct sk_buff *skb) 1462 { 1463 struct fq *fq = &local->fq; 1464 struct fq_tin *tin = &txqi->tin; 1465 u32 flow_idx = fq_flow_idx(fq, skb); 1466 1467 ieee80211_set_skb_enqueue_time(skb); 1468 1469 spin_lock_bh(&fq->lock); 1470 /* 1471 * For management frames, don't really apply codel etc., 1472 * we don't want to apply any shaping or anything we just 1473 * want to simplify the driver API by having them on the 1474 * txqi. 1475 */ 1476 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1477 IEEE80211_SKB_CB(skb)->control.flags |= 1478 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1479 __skb_queue_tail(&txqi->frags, skb); 1480 } else { 1481 fq_tin_enqueue(fq, tin, flow_idx, skb, 1482 fq_skb_free_func); 1483 } 1484 spin_unlock_bh(&fq->lock); 1485 } 1486 1487 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1488 struct fq_flow *flow, struct sk_buff *skb, 1489 void *data) 1490 { 1491 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1492 1493 return info->control.vif == data; 1494 } 1495 1496 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1497 struct ieee80211_sub_if_data *sdata) 1498 { 1499 struct fq *fq = &local->fq; 1500 struct txq_info *txqi; 1501 struct fq_tin *tin; 1502 struct ieee80211_sub_if_data *ap; 1503 1504 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1505 return; 1506 1507 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1508 1509 if (!ap->vif.txq) 1510 return; 1511 1512 txqi = to_txq_info(ap->vif.txq); 1513 tin = &txqi->tin; 1514 1515 spin_lock_bh(&fq->lock); 1516 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1517 fq_skb_free_func); 1518 spin_unlock_bh(&fq->lock); 1519 } 1520 1521 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1522 struct sta_info *sta, 1523 struct txq_info *txqi, int tid) 1524 { 1525 fq_tin_init(&txqi->tin); 1526 codel_vars_init(&txqi->def_cvars); 1527 codel_stats_init(&txqi->cstats); 1528 __skb_queue_head_init(&txqi->frags); 1529 INIT_LIST_HEAD(&txqi->schedule_order); 1530 1531 txqi->txq.vif = &sdata->vif; 1532 1533 if (!sta) { 1534 sdata->vif.txq = &txqi->txq; 1535 txqi->txq.tid = 0; 1536 txqi->txq.ac = IEEE80211_AC_BE; 1537 1538 return; 1539 } 1540 1541 if (tid == IEEE80211_NUM_TIDS) { 1542 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1543 /* Drivers need to opt in to the management MPDU TXQ */ 1544 if (!ieee80211_hw_check(&sdata->local->hw, 1545 STA_MMPDU_TXQ)) 1546 return; 1547 } else if (!ieee80211_hw_check(&sdata->local->hw, 1548 BUFF_MMPDU_TXQ)) { 1549 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1550 return; 1551 } 1552 txqi->txq.ac = IEEE80211_AC_VO; 1553 } else { 1554 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1555 } 1556 1557 txqi->txq.sta = &sta->sta; 1558 txqi->txq.tid = tid; 1559 sta->sta.txq[tid] = &txqi->txq; 1560 } 1561 1562 void ieee80211_txq_purge(struct ieee80211_local *local, 1563 struct txq_info *txqi) 1564 { 1565 struct fq *fq = &local->fq; 1566 struct fq_tin *tin = &txqi->tin; 1567 1568 spin_lock_bh(&fq->lock); 1569 fq_tin_reset(fq, tin, fq_skb_free_func); 1570 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1571 spin_unlock_bh(&fq->lock); 1572 1573 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1574 list_del_init(&txqi->schedule_order); 1575 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1576 } 1577 1578 void ieee80211_txq_set_params(struct ieee80211_local *local) 1579 { 1580 if (local->hw.wiphy->txq_limit) 1581 local->fq.limit = local->hw.wiphy->txq_limit; 1582 else 1583 local->hw.wiphy->txq_limit = local->fq.limit; 1584 1585 if (local->hw.wiphy->txq_memory_limit) 1586 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1587 else 1588 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1589 1590 if (local->hw.wiphy->txq_quantum) 1591 local->fq.quantum = local->hw.wiphy->txq_quantum; 1592 else 1593 local->hw.wiphy->txq_quantum = local->fq.quantum; 1594 } 1595 1596 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1597 { 1598 struct fq *fq = &local->fq; 1599 int ret; 1600 int i; 1601 bool supp_vht = false; 1602 enum nl80211_band band; 1603 1604 ret = fq_init(fq, 4096); 1605 if (ret) 1606 return ret; 1607 1608 /* 1609 * If the hardware doesn't support VHT, it is safe to limit the maximum 1610 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1611 */ 1612 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1613 struct ieee80211_supported_band *sband; 1614 1615 sband = local->hw.wiphy->bands[band]; 1616 if (!sband) 1617 continue; 1618 1619 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1620 } 1621 1622 if (!supp_vht) 1623 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1624 1625 codel_params_init(&local->cparams); 1626 local->cparams.interval = MS2TIME(100); 1627 local->cparams.target = MS2TIME(20); 1628 local->cparams.ecn = true; 1629 1630 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1631 GFP_KERNEL); 1632 if (!local->cvars) { 1633 spin_lock_bh(&fq->lock); 1634 fq_reset(fq, fq_skb_free_func); 1635 spin_unlock_bh(&fq->lock); 1636 return -ENOMEM; 1637 } 1638 1639 for (i = 0; i < fq->flows_cnt; i++) 1640 codel_vars_init(&local->cvars[i]); 1641 1642 ieee80211_txq_set_params(local); 1643 1644 return 0; 1645 } 1646 1647 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1648 { 1649 struct fq *fq = &local->fq; 1650 1651 kfree(local->cvars); 1652 local->cvars = NULL; 1653 1654 spin_lock_bh(&fq->lock); 1655 fq_reset(fq, fq_skb_free_func); 1656 spin_unlock_bh(&fq->lock); 1657 } 1658 1659 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1660 struct ieee80211_sub_if_data *sdata, 1661 struct sta_info *sta, 1662 struct sk_buff *skb) 1663 { 1664 struct ieee80211_vif *vif; 1665 struct txq_info *txqi; 1666 1667 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1668 return false; 1669 1670 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1671 sdata = container_of(sdata->bss, 1672 struct ieee80211_sub_if_data, u.ap); 1673 1674 vif = &sdata->vif; 1675 txqi = ieee80211_get_txq(local, vif, sta, skb); 1676 1677 if (!txqi) 1678 return false; 1679 1680 ieee80211_txq_enqueue(local, txqi, skb); 1681 1682 schedule_and_wake_txq(local, txqi); 1683 1684 return true; 1685 } 1686 1687 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1688 struct ieee80211_vif *vif, 1689 struct sta_info *sta, 1690 struct sk_buff_head *skbs, 1691 bool txpending) 1692 { 1693 struct ieee80211_tx_control control = {}; 1694 struct sk_buff *skb, *tmp; 1695 unsigned long flags; 1696 1697 skb_queue_walk_safe(skbs, skb, tmp) { 1698 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1699 int q = info->hw_queue; 1700 1701 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1702 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1703 __skb_unlink(skb, skbs); 1704 ieee80211_free_txskb(&local->hw, skb); 1705 continue; 1706 } 1707 #endif 1708 1709 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1710 if (local->queue_stop_reasons[q] || 1711 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1712 if (unlikely(info->flags & 1713 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1714 if (local->queue_stop_reasons[q] & 1715 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1716 /* 1717 * Drop off-channel frames if queues 1718 * are stopped for any reason other 1719 * than off-channel operation. Never 1720 * queue them. 1721 */ 1722 spin_unlock_irqrestore( 1723 &local->queue_stop_reason_lock, 1724 flags); 1725 ieee80211_purge_tx_queue(&local->hw, 1726 skbs); 1727 return true; 1728 } 1729 } else { 1730 1731 /* 1732 * Since queue is stopped, queue up frames for 1733 * later transmission from the tx-pending 1734 * tasklet when the queue is woken again. 1735 */ 1736 if (txpending) 1737 skb_queue_splice_init(skbs, 1738 &local->pending[q]); 1739 else 1740 skb_queue_splice_tail_init(skbs, 1741 &local->pending[q]); 1742 1743 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1744 flags); 1745 return false; 1746 } 1747 } 1748 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1749 1750 info->control.vif = vif; 1751 control.sta = sta ? &sta->sta : NULL; 1752 1753 __skb_unlink(skb, skbs); 1754 drv_tx(local, &control, skb); 1755 } 1756 1757 return true; 1758 } 1759 1760 /* 1761 * Returns false if the frame couldn't be transmitted but was queued instead. 1762 */ 1763 static bool __ieee80211_tx(struct ieee80211_local *local, 1764 struct sk_buff_head *skbs, struct sta_info *sta, 1765 bool txpending) 1766 { 1767 struct ieee80211_tx_info *info; 1768 struct ieee80211_sub_if_data *sdata; 1769 struct ieee80211_vif *vif; 1770 struct sk_buff *skb; 1771 bool result; 1772 1773 if (WARN_ON(skb_queue_empty(skbs))) 1774 return true; 1775 1776 skb = skb_peek(skbs); 1777 info = IEEE80211_SKB_CB(skb); 1778 sdata = vif_to_sdata(info->control.vif); 1779 if (sta && !sta->uploaded) 1780 sta = NULL; 1781 1782 switch (sdata->vif.type) { 1783 case NL80211_IFTYPE_MONITOR: 1784 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1785 vif = &sdata->vif; 1786 break; 1787 } 1788 sdata = rcu_dereference(local->monitor_sdata); 1789 if (sdata) { 1790 vif = &sdata->vif; 1791 info->hw_queue = 1792 vif->hw_queue[skb_get_queue_mapping(skb)]; 1793 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1794 ieee80211_purge_tx_queue(&local->hw, skbs); 1795 return true; 1796 } else 1797 vif = NULL; 1798 break; 1799 case NL80211_IFTYPE_AP_VLAN: 1800 sdata = container_of(sdata->bss, 1801 struct ieee80211_sub_if_data, u.ap); 1802 fallthrough; 1803 default: 1804 vif = &sdata->vif; 1805 break; 1806 } 1807 1808 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1809 1810 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1811 1812 return result; 1813 } 1814 1815 /* 1816 * Invoke TX handlers, return 0 on success and non-zero if the 1817 * frame was dropped or queued. 1818 * 1819 * The handlers are split into an early and late part. The latter is everything 1820 * that can be sensitive to reordering, and will be deferred to after packets 1821 * are dequeued from the intermediate queues (when they are enabled). 1822 */ 1823 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1824 { 1825 ieee80211_tx_result res = TX_DROP; 1826 1827 #define CALL_TXH(txh) \ 1828 do { \ 1829 res = txh(tx); \ 1830 if (res != TX_CONTINUE) \ 1831 goto txh_done; \ 1832 } while (0) 1833 1834 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1835 CALL_TXH(ieee80211_tx_h_check_assoc); 1836 CALL_TXH(ieee80211_tx_h_ps_buf); 1837 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1838 CALL_TXH(ieee80211_tx_h_select_key); 1839 1840 txh_done: 1841 if (unlikely(res == TX_DROP)) { 1842 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1843 if (tx->skb) 1844 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1845 else 1846 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1847 return -1; 1848 } else if (unlikely(res == TX_QUEUED)) { 1849 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1850 return -1; 1851 } 1852 1853 return 0; 1854 } 1855 1856 /* 1857 * Late handlers can be called while the sta lock is held. Handlers that can 1858 * cause packets to be generated will cause deadlock! 1859 */ 1860 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1861 { 1862 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1863 ieee80211_tx_result res = TX_CONTINUE; 1864 1865 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1866 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1867 1868 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1869 __skb_queue_tail(&tx->skbs, tx->skb); 1870 tx->skb = NULL; 1871 goto txh_done; 1872 } 1873 1874 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1875 CALL_TXH(ieee80211_tx_h_sequence); 1876 CALL_TXH(ieee80211_tx_h_fragment); 1877 /* handlers after fragment must be aware of tx info fragmentation! */ 1878 CALL_TXH(ieee80211_tx_h_stats); 1879 CALL_TXH(ieee80211_tx_h_encrypt); 1880 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1881 CALL_TXH(ieee80211_tx_h_calculate_duration); 1882 #undef CALL_TXH 1883 1884 txh_done: 1885 if (unlikely(res == TX_DROP)) { 1886 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1887 if (tx->skb) 1888 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1889 else 1890 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1891 return -1; 1892 } else if (unlikely(res == TX_QUEUED)) { 1893 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1894 return -1; 1895 } 1896 1897 return 0; 1898 } 1899 1900 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1901 { 1902 int r = invoke_tx_handlers_early(tx); 1903 1904 if (r) 1905 return r; 1906 return invoke_tx_handlers_late(tx); 1907 } 1908 1909 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1910 struct ieee80211_vif *vif, struct sk_buff *skb, 1911 int band, struct ieee80211_sta **sta) 1912 { 1913 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1915 struct ieee80211_tx_data tx; 1916 struct sk_buff *skb2; 1917 1918 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1919 return false; 1920 1921 info->band = band; 1922 info->control.vif = vif; 1923 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1924 1925 if (invoke_tx_handlers(&tx)) 1926 return false; 1927 1928 if (sta) { 1929 if (tx.sta) 1930 *sta = &tx.sta->sta; 1931 else 1932 *sta = NULL; 1933 } 1934 1935 /* this function isn't suitable for fragmented data frames */ 1936 skb2 = __skb_dequeue(&tx.skbs); 1937 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1938 ieee80211_free_txskb(hw, skb2); 1939 ieee80211_purge_tx_queue(hw, &tx.skbs); 1940 return false; 1941 } 1942 1943 return true; 1944 } 1945 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1946 1947 /* 1948 * Returns false if the frame couldn't be transmitted but was queued instead. 1949 */ 1950 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1951 struct sta_info *sta, struct sk_buff *skb, 1952 bool txpending) 1953 { 1954 struct ieee80211_local *local = sdata->local; 1955 struct ieee80211_tx_data tx; 1956 ieee80211_tx_result res_prepare; 1957 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1958 bool result = true; 1959 1960 if (unlikely(skb->len < 10)) { 1961 dev_kfree_skb(skb); 1962 return true; 1963 } 1964 1965 /* initialises tx */ 1966 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1967 1968 if (unlikely(res_prepare == TX_DROP)) { 1969 ieee80211_free_txskb(&local->hw, skb); 1970 return true; 1971 } else if (unlikely(res_prepare == TX_QUEUED)) { 1972 return true; 1973 } 1974 1975 /* set up hw_queue value early */ 1976 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1977 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1978 info->hw_queue = 1979 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1980 1981 if (invoke_tx_handlers_early(&tx)) 1982 return true; 1983 1984 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1985 return true; 1986 1987 if (!invoke_tx_handlers_late(&tx)) 1988 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1989 1990 return result; 1991 } 1992 1993 /* device xmit handlers */ 1994 1995 enum ieee80211_encrypt { 1996 ENCRYPT_NO, 1997 ENCRYPT_MGMT, 1998 ENCRYPT_DATA, 1999 }; 2000 2001 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 2002 struct sk_buff *skb, 2003 int head_need, 2004 enum ieee80211_encrypt encrypt) 2005 { 2006 struct ieee80211_local *local = sdata->local; 2007 bool enc_tailroom; 2008 int tail_need = 0; 2009 2010 enc_tailroom = encrypt == ENCRYPT_MGMT || 2011 (encrypt == ENCRYPT_DATA && 2012 sdata->crypto_tx_tailroom_needed_cnt); 2013 2014 if (enc_tailroom) { 2015 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2016 tail_need -= skb_tailroom(skb); 2017 tail_need = max_t(int, tail_need, 0); 2018 } 2019 2020 if (skb_cloned(skb) && 2021 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2022 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2023 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2024 else if (head_need || tail_need) 2025 I802_DEBUG_INC(local->tx_expand_skb_head); 2026 else 2027 return 0; 2028 2029 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2030 wiphy_debug(local->hw.wiphy, 2031 "failed to reallocate TX buffer\n"); 2032 return -ENOMEM; 2033 } 2034 2035 return 0; 2036 } 2037 2038 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2039 struct sta_info *sta, struct sk_buff *skb) 2040 { 2041 struct ieee80211_local *local = sdata->local; 2042 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2043 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2044 int headroom; 2045 enum ieee80211_encrypt encrypt; 2046 2047 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2048 encrypt = ENCRYPT_NO; 2049 else if (ieee80211_is_mgmt(hdr->frame_control)) 2050 encrypt = ENCRYPT_MGMT; 2051 else 2052 encrypt = ENCRYPT_DATA; 2053 2054 headroom = local->tx_headroom; 2055 if (encrypt != ENCRYPT_NO) 2056 headroom += IEEE80211_ENCRYPT_HEADROOM; 2057 headroom -= skb_headroom(skb); 2058 headroom = max_t(int, 0, headroom); 2059 2060 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2061 ieee80211_free_txskb(&local->hw, skb); 2062 return; 2063 } 2064 2065 /* reload after potential resize */ 2066 hdr = (struct ieee80211_hdr *) skb->data; 2067 info->control.vif = &sdata->vif; 2068 2069 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2070 if (ieee80211_is_data(hdr->frame_control) && 2071 is_unicast_ether_addr(hdr->addr1)) { 2072 if (mesh_nexthop_resolve(sdata, skb)) 2073 return; /* skb queued: don't free */ 2074 } else { 2075 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2076 } 2077 } 2078 2079 ieee80211_set_qos_hdr(sdata, skb); 2080 ieee80211_tx(sdata, sta, skb, false); 2081 } 2082 2083 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2084 { 2085 struct ieee80211_radiotap_header *rthdr = 2086 (struct ieee80211_radiotap_header *)skb->data; 2087 2088 /* check for not even having the fixed radiotap header part */ 2089 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2090 return false; /* too short to be possibly valid */ 2091 2092 /* is it a header version we can trust to find length from? */ 2093 if (unlikely(rthdr->it_version)) 2094 return false; /* only version 0 is supported */ 2095 2096 /* does the skb contain enough to deliver on the alleged length? */ 2097 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2098 return false; /* skb too short for claimed rt header extent */ 2099 2100 return true; 2101 } 2102 2103 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2104 struct net_device *dev) 2105 { 2106 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2107 struct ieee80211_radiotap_iterator iterator; 2108 struct ieee80211_radiotap_header *rthdr = 2109 (struct ieee80211_radiotap_header *) skb->data; 2110 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2111 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2112 NULL); 2113 u16 txflags; 2114 u16 rate = 0; 2115 bool rate_found = false; 2116 u8 rate_retries = 0; 2117 u16 rate_flags = 0; 2118 u8 mcs_known, mcs_flags, mcs_bw; 2119 u16 vht_known; 2120 u8 vht_mcs = 0, vht_nss = 0; 2121 int i; 2122 2123 if (!ieee80211_validate_radiotap_len(skb)) 2124 return false; 2125 2126 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2127 IEEE80211_TX_CTL_DONTFRAG; 2128 2129 /* 2130 * for every radiotap entry that is present 2131 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2132 * entries present, or -EINVAL on error) 2133 */ 2134 2135 while (!ret) { 2136 ret = ieee80211_radiotap_iterator_next(&iterator); 2137 2138 if (ret) 2139 continue; 2140 2141 /* see if this argument is something we can use */ 2142 switch (iterator.this_arg_index) { 2143 /* 2144 * You must take care when dereferencing iterator.this_arg 2145 * for multibyte types... the pointer is not aligned. Use 2146 * get_unaligned((type *)iterator.this_arg) to dereference 2147 * iterator.this_arg for type "type" safely on all arches. 2148 */ 2149 case IEEE80211_RADIOTAP_FLAGS: 2150 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2151 /* 2152 * this indicates that the skb we have been 2153 * handed has the 32-bit FCS CRC at the end... 2154 * we should react to that by snipping it off 2155 * because it will be recomputed and added 2156 * on transmission 2157 */ 2158 if (skb->len < (iterator._max_length + FCS_LEN)) 2159 return false; 2160 2161 skb_trim(skb, skb->len - FCS_LEN); 2162 } 2163 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2164 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2165 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2166 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2167 break; 2168 2169 case IEEE80211_RADIOTAP_TX_FLAGS: 2170 txflags = get_unaligned_le16(iterator.this_arg); 2171 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2172 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2173 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2174 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2175 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2176 info->control.flags |= 2177 IEEE80211_TX_CTRL_DONT_REORDER; 2178 break; 2179 2180 case IEEE80211_RADIOTAP_RATE: 2181 rate = *iterator.this_arg; 2182 rate_flags = 0; 2183 rate_found = true; 2184 break; 2185 2186 case IEEE80211_RADIOTAP_DATA_RETRIES: 2187 rate_retries = *iterator.this_arg; 2188 break; 2189 2190 case IEEE80211_RADIOTAP_MCS: 2191 mcs_known = iterator.this_arg[0]; 2192 mcs_flags = iterator.this_arg[1]; 2193 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2194 break; 2195 2196 rate_found = true; 2197 rate = iterator.this_arg[2]; 2198 rate_flags = IEEE80211_TX_RC_MCS; 2199 2200 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2201 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2202 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2203 2204 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2205 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2206 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2207 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2208 2209 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2210 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2211 info->flags |= IEEE80211_TX_CTL_LDPC; 2212 2213 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2214 u8 stbc = u8_get_bits(mcs_flags, 2215 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2216 2217 info->flags |= 2218 u32_encode_bits(stbc, 2219 IEEE80211_TX_CTL_STBC); 2220 } 2221 break; 2222 2223 case IEEE80211_RADIOTAP_VHT: 2224 vht_known = get_unaligned_le16(iterator.this_arg); 2225 rate_found = true; 2226 2227 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2228 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2229 (iterator.this_arg[2] & 2230 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2231 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2232 if (vht_known & 2233 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2234 if (iterator.this_arg[3] == 1) 2235 rate_flags |= 2236 IEEE80211_TX_RC_40_MHZ_WIDTH; 2237 else if (iterator.this_arg[3] == 4) 2238 rate_flags |= 2239 IEEE80211_TX_RC_80_MHZ_WIDTH; 2240 else if (iterator.this_arg[3] == 11) 2241 rate_flags |= 2242 IEEE80211_TX_RC_160_MHZ_WIDTH; 2243 } 2244 2245 vht_mcs = iterator.this_arg[4] >> 4; 2246 if (vht_mcs > 11) 2247 vht_mcs = 0; 2248 vht_nss = iterator.this_arg[4] & 0xF; 2249 if (!vht_nss || vht_nss > 8) 2250 vht_nss = 1; 2251 break; 2252 2253 /* 2254 * Please update the file 2255 * Documentation/networking/mac80211-injection.rst 2256 * when parsing new fields here. 2257 */ 2258 2259 default: 2260 break; 2261 } 2262 } 2263 2264 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2265 return false; 2266 2267 if (rate_found) { 2268 struct ieee80211_supported_band *sband = 2269 local->hw.wiphy->bands[info->band]; 2270 2271 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2272 2273 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2274 info->control.rates[i].idx = -1; 2275 info->control.rates[i].flags = 0; 2276 info->control.rates[i].count = 0; 2277 } 2278 2279 if (rate_flags & IEEE80211_TX_RC_MCS) { 2280 info->control.rates[0].idx = rate; 2281 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2282 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2283 vht_nss); 2284 } else if (sband) { 2285 for (i = 0; i < sband->n_bitrates; i++) { 2286 if (rate * 5 != sband->bitrates[i].bitrate) 2287 continue; 2288 2289 info->control.rates[0].idx = i; 2290 break; 2291 } 2292 } 2293 2294 if (info->control.rates[0].idx < 0) 2295 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2296 2297 info->control.rates[0].flags = rate_flags; 2298 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2299 local->hw.max_rate_tries); 2300 } 2301 2302 return true; 2303 } 2304 2305 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2306 struct net_device *dev) 2307 { 2308 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2309 struct ieee80211_chanctx_conf *chanctx_conf; 2310 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2311 struct ieee80211_hdr *hdr; 2312 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2313 struct cfg80211_chan_def *chandef; 2314 u16 len_rthdr; 2315 int hdrlen; 2316 2317 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2318 if (unlikely(!ieee80211_sdata_running(sdata))) 2319 goto fail; 2320 2321 memset(info, 0, sizeof(*info)); 2322 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2323 IEEE80211_TX_CTL_INJECTED; 2324 2325 /* Sanity-check the length of the radiotap header */ 2326 if (!ieee80211_validate_radiotap_len(skb)) 2327 goto fail; 2328 2329 /* we now know there is a radiotap header with a length we can use */ 2330 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2331 2332 /* 2333 * fix up the pointers accounting for the radiotap 2334 * header still being in there. We are being given 2335 * a precooked IEEE80211 header so no need for 2336 * normal processing 2337 */ 2338 skb_set_mac_header(skb, len_rthdr); 2339 /* 2340 * these are just fixed to the end of the rt area since we 2341 * don't have any better information and at this point, nobody cares 2342 */ 2343 skb_set_network_header(skb, len_rthdr); 2344 skb_set_transport_header(skb, len_rthdr); 2345 2346 if (skb->len < len_rthdr + 2) 2347 goto fail; 2348 2349 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2350 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2351 2352 if (skb->len < len_rthdr + hdrlen) 2353 goto fail; 2354 2355 /* 2356 * Initialize skb->protocol if the injected frame is a data frame 2357 * carrying a rfc1042 header 2358 */ 2359 if (ieee80211_is_data(hdr->frame_control) && 2360 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2361 u8 *payload = (u8 *)hdr + hdrlen; 2362 2363 if (ether_addr_equal(payload, rfc1042_header)) 2364 skb->protocol = cpu_to_be16((payload[6] << 8) | 2365 payload[7]); 2366 } 2367 2368 rcu_read_lock(); 2369 2370 /* 2371 * We process outgoing injected frames that have a local address 2372 * we handle as though they are non-injected frames. 2373 * This code here isn't entirely correct, the local MAC address 2374 * isn't always enough to find the interface to use; for proper 2375 * VLAN support we have an nl80211-based mechanism. 2376 * 2377 * This is necessary, for example, for old hostapd versions that 2378 * don't use nl80211-based management TX/RX. 2379 */ 2380 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2381 if (!ieee80211_sdata_running(tmp_sdata)) 2382 continue; 2383 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2384 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2385 continue; 2386 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2387 sdata = tmp_sdata; 2388 break; 2389 } 2390 } 2391 2392 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2393 if (!chanctx_conf) { 2394 tmp_sdata = rcu_dereference(local->monitor_sdata); 2395 if (tmp_sdata) 2396 chanctx_conf = 2397 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2398 } 2399 2400 if (chanctx_conf) 2401 chandef = &chanctx_conf->def; 2402 else if (!local->use_chanctx) 2403 chandef = &local->_oper_chandef; 2404 else 2405 goto fail_rcu; 2406 2407 /* 2408 * Frame injection is not allowed if beaconing is not allowed 2409 * or if we need radar detection. Beaconing is usually not allowed when 2410 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2411 * Passive scan is also used in world regulatory domains where 2412 * your country is not known and as such it should be treated as 2413 * NO TX unless the channel is explicitly allowed in which case 2414 * your current regulatory domain would not have the passive scan 2415 * flag. 2416 * 2417 * Since AP mode uses monitor interfaces to inject/TX management 2418 * frames we can make AP mode the exception to this rule once it 2419 * supports radar detection as its implementation can deal with 2420 * radar detection by itself. We can do that later by adding a 2421 * monitor flag interfaces used for AP support. 2422 */ 2423 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2424 sdata->vif.type)) 2425 goto fail_rcu; 2426 2427 info->band = chandef->chan->band; 2428 2429 /* Initialize skb->priority according to frame type and TID class, 2430 * with respect to the sub interface that the frame will actually 2431 * be transmitted on. If the DONT_REORDER flag is set, the original 2432 * skb-priority is preserved to assure frames injected with this 2433 * flag are not reordered relative to each other. 2434 */ 2435 ieee80211_select_queue_80211(sdata, skb, hdr); 2436 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2437 2438 /* 2439 * Process the radiotap header. This will now take into account the 2440 * selected chandef above to accurately set injection rates and 2441 * retransmissions. 2442 */ 2443 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2444 goto fail_rcu; 2445 2446 /* remove the injection radiotap header */ 2447 skb_pull(skb, len_rthdr); 2448 2449 ieee80211_xmit(sdata, NULL, skb); 2450 rcu_read_unlock(); 2451 2452 return NETDEV_TX_OK; 2453 2454 fail_rcu: 2455 rcu_read_unlock(); 2456 fail: 2457 dev_kfree_skb(skb); 2458 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2459 } 2460 2461 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2462 { 2463 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2464 2465 return ethertype == ETH_P_TDLS && 2466 skb->len > 14 && 2467 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2468 } 2469 2470 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2471 struct sk_buff *skb, 2472 struct sta_info **sta_out) 2473 { 2474 struct sta_info *sta; 2475 2476 switch (sdata->vif.type) { 2477 case NL80211_IFTYPE_AP_VLAN: 2478 sta = rcu_dereference(sdata->u.vlan.sta); 2479 if (sta) { 2480 *sta_out = sta; 2481 return 0; 2482 } else if (sdata->wdev.use_4addr) { 2483 return -ENOLINK; 2484 } 2485 fallthrough; 2486 case NL80211_IFTYPE_AP: 2487 case NL80211_IFTYPE_OCB: 2488 case NL80211_IFTYPE_ADHOC: 2489 if (is_multicast_ether_addr(skb->data)) { 2490 *sta_out = ERR_PTR(-ENOENT); 2491 return 0; 2492 } 2493 sta = sta_info_get_bss(sdata, skb->data); 2494 break; 2495 #ifdef CONFIG_MAC80211_MESH 2496 case NL80211_IFTYPE_MESH_POINT: 2497 /* determined much later */ 2498 *sta_out = NULL; 2499 return 0; 2500 #endif 2501 case NL80211_IFTYPE_STATION: 2502 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2503 sta = sta_info_get(sdata, skb->data); 2504 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2505 if (test_sta_flag(sta, 2506 WLAN_STA_TDLS_PEER_AUTH)) { 2507 *sta_out = sta; 2508 return 0; 2509 } 2510 2511 /* 2512 * TDLS link during setup - throw out frames to 2513 * peer. Allow TDLS-setup frames to unauthorized 2514 * peers for the special case of a link teardown 2515 * after a TDLS sta is removed due to being 2516 * unreachable. 2517 */ 2518 if (!ieee80211_is_tdls_setup(skb)) 2519 return -EINVAL; 2520 } 2521 2522 } 2523 2524 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2525 if (!sta) 2526 return -ENOLINK; 2527 break; 2528 default: 2529 return -EINVAL; 2530 } 2531 2532 *sta_out = sta ?: ERR_PTR(-ENOENT); 2533 return 0; 2534 } 2535 2536 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2537 struct sk_buff *skb, 2538 u32 *info_flags, 2539 u64 *cookie) 2540 { 2541 struct sk_buff *ack_skb; 2542 u16 info_id = 0; 2543 2544 if (skb->sk) 2545 ack_skb = skb_clone_sk(skb); 2546 else 2547 ack_skb = skb_clone(skb, GFP_ATOMIC); 2548 2549 if (ack_skb) { 2550 unsigned long flags; 2551 int id; 2552 2553 spin_lock_irqsave(&local->ack_status_lock, flags); 2554 id = idr_alloc(&local->ack_status_frames, ack_skb, 2555 1, 0x2000, GFP_ATOMIC); 2556 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2557 2558 if (id >= 0) { 2559 info_id = id; 2560 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2561 if (cookie) { 2562 *cookie = ieee80211_mgmt_tx_cookie(local); 2563 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2564 } 2565 } else { 2566 kfree_skb(ack_skb); 2567 } 2568 } 2569 2570 return info_id; 2571 } 2572 2573 /** 2574 * ieee80211_build_hdr - build 802.11 header in the given frame 2575 * @sdata: virtual interface to build the header for 2576 * @skb: the skb to build the header in 2577 * @info_flags: skb flags to set 2578 * @sta: the station pointer 2579 * @ctrl_flags: info control flags to set 2580 * @cookie: cookie pointer to fill (if not %NULL) 2581 * 2582 * This function takes the skb with 802.3 header and reformats the header to 2583 * the appropriate IEEE 802.11 header based on which interface the packet is 2584 * being transmitted on. 2585 * 2586 * Note that this function also takes care of the TX status request and 2587 * potential unsharing of the SKB - this needs to be interleaved with the 2588 * header building. 2589 * 2590 * The function requires the read-side RCU lock held 2591 * 2592 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2593 */ 2594 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2595 struct sk_buff *skb, u32 info_flags, 2596 struct sta_info *sta, u32 ctrl_flags, 2597 u64 *cookie) 2598 { 2599 struct ieee80211_local *local = sdata->local; 2600 struct ieee80211_tx_info *info; 2601 int head_need; 2602 u16 ethertype, hdrlen, meshhdrlen = 0; 2603 __le16 fc; 2604 struct ieee80211_hdr hdr; 2605 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2606 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2607 const u8 *encaps_data; 2608 int encaps_len, skip_header_bytes; 2609 bool wme_sta = false, authorized = false; 2610 bool tdls_peer; 2611 bool multicast; 2612 u16 info_id = 0; 2613 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2614 enum nl80211_band band; 2615 int ret; 2616 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2617 2618 if (IS_ERR(sta)) 2619 sta = NULL; 2620 2621 #ifdef CONFIG_MAC80211_DEBUGFS 2622 if (local->force_tx_status) 2623 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2624 #endif 2625 2626 /* convert Ethernet header to proper 802.11 header (based on 2627 * operation mode) */ 2628 ethertype = (skb->data[12] << 8) | skb->data[13]; 2629 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2630 2631 if (!sdata->vif.valid_links) 2632 chanctx_conf = 2633 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2634 2635 switch (sdata->vif.type) { 2636 case NL80211_IFTYPE_AP_VLAN: 2637 if (sdata->wdev.use_4addr) { 2638 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2639 /* RA TA DA SA */ 2640 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2641 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2642 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2643 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2644 hdrlen = 30; 2645 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2646 wme_sta = sta->sta.wme; 2647 } 2648 if (!sdata->vif.valid_links) { 2649 struct ieee80211_sub_if_data *ap_sdata; 2650 2651 /* override chanctx_conf from AP (we don't have one) */ 2652 ap_sdata = container_of(sdata->bss, 2653 struct ieee80211_sub_if_data, 2654 u.ap); 2655 chanctx_conf = 2656 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2657 } 2658 if (sdata->wdev.use_4addr) 2659 break; 2660 fallthrough; 2661 case NL80211_IFTYPE_AP: 2662 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2663 /* DA BSSID SA */ 2664 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2665 2666 if (sdata->vif.valid_links && sta && !sta->sta.mlo) { 2667 struct ieee80211_link_data *link; 2668 2669 link_id = sta->deflink.link_id; 2670 link = rcu_dereference(sdata->link[link_id]); 2671 if (WARN_ON(!link)) { 2672 ret = -ENOLINK; 2673 goto free; 2674 } 2675 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2676 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2677 (sta && sta->sta.mlo)) { 2678 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2679 } else { 2680 struct ieee80211_bss_conf *conf; 2681 2682 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2683 if (unlikely(!conf)) { 2684 ret = -ENOLINK; 2685 goto free; 2686 } 2687 2688 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2689 } 2690 2691 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2692 hdrlen = 24; 2693 break; 2694 #ifdef CONFIG_MAC80211_MESH 2695 case NL80211_IFTYPE_MESH_POINT: 2696 if (!is_multicast_ether_addr(skb->data)) { 2697 struct sta_info *next_hop; 2698 bool mpp_lookup = true; 2699 2700 mpath = mesh_path_lookup(sdata, skb->data); 2701 if (mpath) { 2702 mpp_lookup = false; 2703 next_hop = rcu_dereference(mpath->next_hop); 2704 if (!next_hop || 2705 !(mpath->flags & (MESH_PATH_ACTIVE | 2706 MESH_PATH_RESOLVING))) 2707 mpp_lookup = true; 2708 } 2709 2710 if (mpp_lookup) { 2711 mppath = mpp_path_lookup(sdata, skb->data); 2712 if (mppath) 2713 mppath->exp_time = jiffies; 2714 } 2715 2716 if (mppath && mpath) 2717 mesh_path_del(sdata, mpath->dst); 2718 } 2719 2720 /* 2721 * Use address extension if it is a packet from 2722 * another interface or if we know the destination 2723 * is being proxied by a portal (i.e. portal address 2724 * differs from proxied address) 2725 */ 2726 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2727 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2728 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2729 skb->data, skb->data + ETH_ALEN); 2730 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2731 NULL, NULL); 2732 } else { 2733 /* DS -> MBSS (802.11-2012 13.11.3.3). 2734 * For unicast with unknown forwarding information, 2735 * destination might be in the MBSS or if that fails 2736 * forwarded to another mesh gate. In either case 2737 * resolution will be handled in ieee80211_xmit(), so 2738 * leave the original DA. This also works for mcast */ 2739 const u8 *mesh_da = skb->data; 2740 2741 if (mppath) 2742 mesh_da = mppath->mpp; 2743 else if (mpath) 2744 mesh_da = mpath->dst; 2745 2746 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2747 mesh_da, sdata->vif.addr); 2748 if (is_multicast_ether_addr(mesh_da)) 2749 /* DA TA mSA AE:SA */ 2750 meshhdrlen = ieee80211_new_mesh_header( 2751 sdata, &mesh_hdr, 2752 skb->data + ETH_ALEN, NULL); 2753 else 2754 /* RA TA mDA mSA AE:DA SA */ 2755 meshhdrlen = ieee80211_new_mesh_header( 2756 sdata, &mesh_hdr, skb->data, 2757 skb->data + ETH_ALEN); 2758 2759 } 2760 2761 /* For injected frames, fill RA right away as nexthop lookup 2762 * will be skipped. 2763 */ 2764 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2765 is_zero_ether_addr(hdr.addr1)) 2766 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2767 break; 2768 #endif 2769 case NL80211_IFTYPE_STATION: 2770 /* we already did checks when looking up the RA STA */ 2771 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2772 2773 if (tdls_peer) { 2774 /* DA SA BSSID */ 2775 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2776 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2777 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2778 hdrlen = 24; 2779 } else if (sdata->u.mgd.use_4addr && 2780 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2781 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2782 IEEE80211_FCTL_TODS); 2783 /* RA TA DA SA */ 2784 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2785 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2786 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2787 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2788 hdrlen = 30; 2789 } else { 2790 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2791 /* BSSID SA DA */ 2792 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2793 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2794 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2795 hdrlen = 24; 2796 } 2797 break; 2798 case NL80211_IFTYPE_OCB: 2799 /* DA SA BSSID */ 2800 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2801 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2802 eth_broadcast_addr(hdr.addr3); 2803 hdrlen = 24; 2804 break; 2805 case NL80211_IFTYPE_ADHOC: 2806 /* DA SA BSSID */ 2807 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2808 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2809 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2810 hdrlen = 24; 2811 break; 2812 default: 2813 ret = -EINVAL; 2814 goto free; 2815 } 2816 2817 if (!chanctx_conf) { 2818 if (!sdata->vif.valid_links) { 2819 ret = -ENOTCONN; 2820 goto free; 2821 } 2822 /* MLD transmissions must not rely on the band */ 2823 band = 0; 2824 } else { 2825 band = chanctx_conf->def.chan->band; 2826 } 2827 2828 multicast = is_multicast_ether_addr(hdr.addr1); 2829 2830 /* sta is always NULL for mesh */ 2831 if (sta) { 2832 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2833 wme_sta = sta->sta.wme; 2834 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2835 /* For mesh, the use of the QoS header is mandatory */ 2836 wme_sta = true; 2837 } 2838 2839 /* receiver does QoS (which also means we do) use it */ 2840 if (wme_sta) { 2841 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2842 hdrlen += 2; 2843 } 2844 2845 /* 2846 * Drop unicast frames to unauthorised stations unless they are 2847 * EAPOL frames from the local station. 2848 */ 2849 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2850 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2851 !multicast && !authorized && 2852 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2853 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2854 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2855 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2856 sdata->name, hdr.addr1); 2857 #endif 2858 2859 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2860 2861 ret = -EPERM; 2862 goto free; 2863 } 2864 2865 if (unlikely(!multicast && ((skb->sk && 2866 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2867 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2868 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2869 cookie); 2870 2871 /* 2872 * If the skb is shared we need to obtain our own copy. 2873 */ 2874 skb = skb_share_check(skb, GFP_ATOMIC); 2875 if (unlikely(!skb)) { 2876 ret = -ENOMEM; 2877 goto free; 2878 } 2879 2880 hdr.frame_control = fc; 2881 hdr.duration_id = 0; 2882 hdr.seq_ctrl = 0; 2883 2884 skip_header_bytes = ETH_HLEN; 2885 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2886 encaps_data = bridge_tunnel_header; 2887 encaps_len = sizeof(bridge_tunnel_header); 2888 skip_header_bytes -= 2; 2889 } else if (ethertype >= ETH_P_802_3_MIN) { 2890 encaps_data = rfc1042_header; 2891 encaps_len = sizeof(rfc1042_header); 2892 skip_header_bytes -= 2; 2893 } else { 2894 encaps_data = NULL; 2895 encaps_len = 0; 2896 } 2897 2898 skb_pull(skb, skip_header_bytes); 2899 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2900 2901 /* 2902 * So we need to modify the skb header and hence need a copy of 2903 * that. The head_need variable above doesn't, so far, include 2904 * the needed header space that we don't need right away. If we 2905 * can, then we don't reallocate right now but only after the 2906 * frame arrives at the master device (if it does...) 2907 * 2908 * If we cannot, however, then we will reallocate to include all 2909 * the ever needed space. Also, if we need to reallocate it anyway, 2910 * make it big enough for everything we may ever need. 2911 */ 2912 2913 if (head_need > 0 || skb_cloned(skb)) { 2914 head_need += IEEE80211_ENCRYPT_HEADROOM; 2915 head_need += local->tx_headroom; 2916 head_need = max_t(int, 0, head_need); 2917 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2918 ieee80211_free_txskb(&local->hw, skb); 2919 skb = NULL; 2920 return ERR_PTR(-ENOMEM); 2921 } 2922 } 2923 2924 if (encaps_data) 2925 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2926 2927 #ifdef CONFIG_MAC80211_MESH 2928 if (meshhdrlen > 0) 2929 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2930 #endif 2931 2932 if (ieee80211_is_data_qos(fc)) { 2933 __le16 *qos_control; 2934 2935 qos_control = skb_push(skb, 2); 2936 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2937 /* 2938 * Maybe we could actually set some fields here, for now just 2939 * initialise to zero to indicate no special operation. 2940 */ 2941 *qos_control = 0; 2942 } else 2943 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2944 2945 skb_reset_mac_header(skb); 2946 2947 info = IEEE80211_SKB_CB(skb); 2948 memset(info, 0, sizeof(*info)); 2949 2950 info->flags = info_flags; 2951 info->ack_frame_id = info_id; 2952 info->band = band; 2953 2954 if (likely(!cookie)) { 2955 ctrl_flags |= u32_encode_bits(link_id, 2956 IEEE80211_TX_CTRL_MLO_LINK); 2957 } else { 2958 unsigned int pre_conf_link_id; 2959 2960 /* 2961 * ctrl_flags already have been set by 2962 * ieee80211_tx_control_port(), here 2963 * we just sanity check that 2964 */ 2965 2966 pre_conf_link_id = u32_get_bits(ctrl_flags, 2967 IEEE80211_TX_CTRL_MLO_LINK); 2968 2969 if (pre_conf_link_id != link_id && 2970 link_id != IEEE80211_LINK_UNSPECIFIED) { 2971 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2972 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2973 sdata->name, hdr.addr1, 2974 pre_conf_link_id, link_id); 2975 #endif 2976 ret = -EINVAL; 2977 goto free; 2978 } 2979 } 2980 2981 info->control.flags = ctrl_flags; 2982 2983 return skb; 2984 free: 2985 kfree_skb(skb); 2986 return ERR_PTR(ret); 2987 } 2988 2989 /* 2990 * fast-xmit overview 2991 * 2992 * The core idea of this fast-xmit is to remove per-packet checks by checking 2993 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2994 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2995 * much less work can be done per packet. For example, fragmentation must be 2996 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2997 * in the code here. 2998 * 2999 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3000 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3001 * 3002 * The most difficult part of this is that when any of these assumptions 3003 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3004 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3005 * since the per-packet code no longer checks the conditions. This is reflected 3006 * by the calls to these functions throughout the rest of the code, and must be 3007 * maintained if any of the TX path checks change. 3008 */ 3009 3010 void ieee80211_check_fast_xmit(struct sta_info *sta) 3011 { 3012 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3013 struct ieee80211_local *local = sta->local; 3014 struct ieee80211_sub_if_data *sdata = sta->sdata; 3015 struct ieee80211_hdr *hdr = (void *)build.hdr; 3016 struct ieee80211_chanctx_conf *chanctx_conf; 3017 __le16 fc; 3018 3019 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3020 return; 3021 3022 /* Locking here protects both the pointer itself, and against concurrent 3023 * invocations winning data access races to, e.g., the key pointer that 3024 * is used. 3025 * Without it, the invocation of this function right after the key 3026 * pointer changes wouldn't be sufficient, as another CPU could access 3027 * the pointer, then stall, and then do the cache update after the CPU 3028 * that invalidated the key. 3029 * With the locking, such scenarios cannot happen as the check for the 3030 * key and the fast-tx assignment are done atomically, so the CPU that 3031 * modifies the key will either wait or other one will see the key 3032 * cleared/changed already. 3033 */ 3034 spin_lock_bh(&sta->lock); 3035 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3036 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3037 sdata->vif.type == NL80211_IFTYPE_STATION) 3038 goto out; 3039 3040 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3041 goto out; 3042 3043 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3044 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3045 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3046 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3047 goto out; 3048 3049 if (sdata->noack_map) 3050 goto out; 3051 3052 /* fast-xmit doesn't handle fragmentation at all */ 3053 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3054 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3055 goto out; 3056 3057 if (!sdata->vif.valid_links) { 3058 rcu_read_lock(); 3059 chanctx_conf = 3060 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3061 if (!chanctx_conf) { 3062 rcu_read_unlock(); 3063 goto out; 3064 } 3065 build.band = chanctx_conf->def.chan->band; 3066 rcu_read_unlock(); 3067 } else { 3068 /* MLD transmissions must not rely on the band */ 3069 build.band = 0; 3070 } 3071 3072 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3073 3074 switch (sdata->vif.type) { 3075 case NL80211_IFTYPE_ADHOC: 3076 /* DA SA BSSID */ 3077 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3078 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3079 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3080 build.hdr_len = 24; 3081 break; 3082 case NL80211_IFTYPE_STATION: 3083 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3084 /* DA SA BSSID */ 3085 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3086 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3087 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3088 build.hdr_len = 24; 3089 break; 3090 } 3091 3092 if (sdata->u.mgd.use_4addr) { 3093 /* non-regular ethertype cannot use the fastpath */ 3094 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3095 IEEE80211_FCTL_TODS); 3096 /* RA TA DA SA */ 3097 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3098 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3099 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3100 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3101 build.hdr_len = 30; 3102 break; 3103 } 3104 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3105 /* BSSID SA DA */ 3106 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3107 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3108 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3109 build.hdr_len = 24; 3110 break; 3111 case NL80211_IFTYPE_AP_VLAN: 3112 if (sdata->wdev.use_4addr) { 3113 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3114 IEEE80211_FCTL_TODS); 3115 /* RA TA DA SA */ 3116 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3117 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3118 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3119 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3120 build.hdr_len = 30; 3121 break; 3122 } 3123 fallthrough; 3124 case NL80211_IFTYPE_AP: 3125 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3126 /* DA BSSID SA */ 3127 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3128 if (sta->sta.mlo || !sdata->vif.valid_links) { 3129 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3130 } else { 3131 unsigned int link_id = sta->deflink.link_id; 3132 struct ieee80211_link_data *link; 3133 3134 rcu_read_lock(); 3135 link = rcu_dereference(sdata->link[link_id]); 3136 if (WARN_ON(!link)) { 3137 rcu_read_unlock(); 3138 goto out; 3139 } 3140 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3141 rcu_read_unlock(); 3142 } 3143 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3144 build.hdr_len = 24; 3145 break; 3146 default: 3147 /* not handled on fast-xmit */ 3148 goto out; 3149 } 3150 3151 if (sta->sta.wme) { 3152 build.hdr_len += 2; 3153 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3154 } 3155 3156 /* We store the key here so there's no point in using rcu_dereference() 3157 * but that's fine because the code that changes the pointers will call 3158 * this function after doing so. For a single CPU that would be enough, 3159 * for multiple see the comment above. 3160 */ 3161 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3162 if (!build.key) 3163 build.key = rcu_access_pointer(sdata->default_unicast_key); 3164 if (build.key) { 3165 bool gen_iv, iv_spc, mmic; 3166 3167 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3168 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3169 mmic = build.key->conf.flags & 3170 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3171 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3172 3173 /* don't handle software crypto */ 3174 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3175 goto out; 3176 3177 /* Key is being removed */ 3178 if (build.key->flags & KEY_FLAG_TAINTED) 3179 goto out; 3180 3181 switch (build.key->conf.cipher) { 3182 case WLAN_CIPHER_SUITE_CCMP: 3183 case WLAN_CIPHER_SUITE_CCMP_256: 3184 if (gen_iv) 3185 build.pn_offs = build.hdr_len; 3186 if (gen_iv || iv_spc) 3187 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3188 break; 3189 case WLAN_CIPHER_SUITE_GCMP: 3190 case WLAN_CIPHER_SUITE_GCMP_256: 3191 if (gen_iv) 3192 build.pn_offs = build.hdr_len; 3193 if (gen_iv || iv_spc) 3194 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3195 break; 3196 case WLAN_CIPHER_SUITE_TKIP: 3197 /* cannot handle MMIC or IV generation in xmit-fast */ 3198 if (mmic || gen_iv) 3199 goto out; 3200 if (iv_spc) 3201 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3202 break; 3203 case WLAN_CIPHER_SUITE_WEP40: 3204 case WLAN_CIPHER_SUITE_WEP104: 3205 /* cannot handle IV generation in fast-xmit */ 3206 if (gen_iv) 3207 goto out; 3208 if (iv_spc) 3209 build.hdr_len += IEEE80211_WEP_IV_LEN; 3210 break; 3211 case WLAN_CIPHER_SUITE_AES_CMAC: 3212 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3213 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3214 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3215 WARN(1, 3216 "management cipher suite 0x%x enabled for data\n", 3217 build.key->conf.cipher); 3218 goto out; 3219 default: 3220 /* we don't know how to generate IVs for this at all */ 3221 if (WARN_ON(gen_iv)) 3222 goto out; 3223 } 3224 3225 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3226 } 3227 3228 hdr->frame_control = fc; 3229 3230 memcpy(build.hdr + build.hdr_len, 3231 rfc1042_header, sizeof(rfc1042_header)); 3232 build.hdr_len += sizeof(rfc1042_header); 3233 3234 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3235 /* if the kmemdup fails, continue w/o fast_tx */ 3236 3237 out: 3238 /* we might have raced against another call to this function */ 3239 old = rcu_dereference_protected(sta->fast_tx, 3240 lockdep_is_held(&sta->lock)); 3241 rcu_assign_pointer(sta->fast_tx, fast_tx); 3242 if (old) 3243 kfree_rcu(old, rcu_head); 3244 spin_unlock_bh(&sta->lock); 3245 } 3246 3247 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3248 { 3249 struct sta_info *sta; 3250 3251 rcu_read_lock(); 3252 list_for_each_entry_rcu(sta, &local->sta_list, list) 3253 ieee80211_check_fast_xmit(sta); 3254 rcu_read_unlock(); 3255 } 3256 3257 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3258 { 3259 struct ieee80211_local *local = sdata->local; 3260 struct sta_info *sta; 3261 3262 rcu_read_lock(); 3263 3264 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3265 if (sdata != sta->sdata && 3266 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3267 continue; 3268 ieee80211_check_fast_xmit(sta); 3269 } 3270 3271 rcu_read_unlock(); 3272 } 3273 3274 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3275 { 3276 struct ieee80211_fast_tx *fast_tx; 3277 3278 spin_lock_bh(&sta->lock); 3279 fast_tx = rcu_dereference_protected(sta->fast_tx, 3280 lockdep_is_held(&sta->lock)); 3281 RCU_INIT_POINTER(sta->fast_tx, NULL); 3282 spin_unlock_bh(&sta->lock); 3283 3284 if (fast_tx) 3285 kfree_rcu(fast_tx, rcu_head); 3286 } 3287 3288 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3289 struct sk_buff *skb, int headroom) 3290 { 3291 if (skb_headroom(skb) < headroom) { 3292 I802_DEBUG_INC(local->tx_expand_skb_head); 3293 3294 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3295 wiphy_debug(local->hw.wiphy, 3296 "failed to reallocate TX buffer\n"); 3297 return false; 3298 } 3299 } 3300 3301 return true; 3302 } 3303 3304 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3305 struct ieee80211_fast_tx *fast_tx, 3306 struct sk_buff *skb) 3307 { 3308 struct ieee80211_local *local = sdata->local; 3309 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3310 struct ieee80211_hdr *hdr; 3311 struct ethhdr *amsdu_hdr; 3312 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3313 int subframe_len = skb->len - hdr_len; 3314 void *data; 3315 u8 *qc, *h_80211_src, *h_80211_dst; 3316 const u8 *bssid; 3317 3318 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3319 return false; 3320 3321 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3322 return true; 3323 3324 if (!ieee80211_amsdu_realloc_pad(local, skb, 3325 sizeof(*amsdu_hdr) + 3326 local->hw.extra_tx_headroom)) 3327 return false; 3328 3329 data = skb_push(skb, sizeof(*amsdu_hdr)); 3330 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3331 hdr = data; 3332 amsdu_hdr = data + hdr_len; 3333 /* h_80211_src/dst is addr* field within hdr */ 3334 h_80211_src = data + fast_tx->sa_offs; 3335 h_80211_dst = data + fast_tx->da_offs; 3336 3337 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3338 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3339 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3340 3341 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3342 * fields needs to be changed to BSSID for A-MSDU frames depending 3343 * on FromDS/ToDS values. 3344 */ 3345 switch (sdata->vif.type) { 3346 case NL80211_IFTYPE_STATION: 3347 bssid = sdata->vif.cfg.ap_addr; 3348 break; 3349 case NL80211_IFTYPE_AP: 3350 case NL80211_IFTYPE_AP_VLAN: 3351 bssid = sdata->vif.addr; 3352 break; 3353 default: 3354 bssid = NULL; 3355 } 3356 3357 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3358 ether_addr_copy(h_80211_src, bssid); 3359 3360 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3361 ether_addr_copy(h_80211_dst, bssid); 3362 3363 qc = ieee80211_get_qos_ctl(hdr); 3364 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3365 3366 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3367 3368 return true; 3369 } 3370 3371 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3372 struct sta_info *sta, 3373 struct ieee80211_fast_tx *fast_tx, 3374 struct sk_buff *skb) 3375 { 3376 struct ieee80211_local *local = sdata->local; 3377 struct fq *fq = &local->fq; 3378 struct fq_tin *tin; 3379 struct fq_flow *flow; 3380 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3381 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3382 struct txq_info *txqi; 3383 struct sk_buff **frag_tail, *head; 3384 int subframe_len = skb->len - ETH_ALEN; 3385 u8 max_subframes = sta->sta.max_amsdu_subframes; 3386 int max_frags = local->hw.max_tx_fragments; 3387 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3388 int orig_truesize; 3389 u32 flow_idx; 3390 __be16 len; 3391 void *data; 3392 bool ret = false; 3393 unsigned int orig_len; 3394 int n = 2, nfrags, pad = 0; 3395 u16 hdrlen; 3396 3397 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3398 return false; 3399 3400 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3401 return false; 3402 3403 if (skb_is_gso(skb)) 3404 return false; 3405 3406 if (!txq) 3407 return false; 3408 3409 txqi = to_txq_info(txq); 3410 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3411 return false; 3412 3413 if (sta->sta.cur->max_rc_amsdu_len) 3414 max_amsdu_len = min_t(int, max_amsdu_len, 3415 sta->sta.cur->max_rc_amsdu_len); 3416 3417 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3418 max_amsdu_len = min_t(int, max_amsdu_len, 3419 sta->sta.cur->max_tid_amsdu_len[tid]); 3420 3421 flow_idx = fq_flow_idx(fq, skb); 3422 3423 spin_lock_bh(&fq->lock); 3424 3425 /* TODO: Ideally aggregation should be done on dequeue to remain 3426 * responsive to environment changes. 3427 */ 3428 3429 tin = &txqi->tin; 3430 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3431 head = skb_peek_tail(&flow->queue); 3432 if (!head || skb_is_gso(head)) 3433 goto out; 3434 3435 orig_truesize = head->truesize; 3436 orig_len = head->len; 3437 3438 if (skb->len + head->len > max_amsdu_len) 3439 goto out; 3440 3441 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3442 nfrags += 1 + skb_shinfo(head)->nr_frags; 3443 frag_tail = &skb_shinfo(head)->frag_list; 3444 while (*frag_tail) { 3445 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3446 frag_tail = &(*frag_tail)->next; 3447 n++; 3448 } 3449 3450 if (max_subframes && n > max_subframes) 3451 goto out; 3452 3453 if (max_frags && nfrags > max_frags) 3454 goto out; 3455 3456 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3457 goto out; 3458 3459 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3460 goto out; 3461 3462 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3463 * and frag_tail should be &skb_shinfo(head)->frag_list. 3464 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3465 * Reload frag_tail to have it pointing to the correct place. 3466 */ 3467 if (n == 2) 3468 frag_tail = &skb_shinfo(head)->frag_list; 3469 3470 /* 3471 * Pad out the previous subframe to a multiple of 4 by adding the 3472 * padding to the next one, that's being added. Note that head->len 3473 * is the length of the full A-MSDU, but that works since each time 3474 * we add a new subframe we pad out the previous one to a multiple 3475 * of 4 and thus it no longer matters in the next round. 3476 */ 3477 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3478 if ((head->len - hdrlen) & 3) 3479 pad = 4 - ((head->len - hdrlen) & 3); 3480 3481 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3482 2 + pad)) 3483 goto out_recalc; 3484 3485 ret = true; 3486 data = skb_push(skb, ETH_ALEN + 2); 3487 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3488 3489 data += 2 * ETH_ALEN; 3490 len = cpu_to_be16(subframe_len); 3491 memcpy(data, &len, 2); 3492 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3493 3494 memset(skb_push(skb, pad), 0, pad); 3495 3496 head->len += skb->len; 3497 head->data_len += skb->len; 3498 *frag_tail = skb; 3499 3500 out_recalc: 3501 fq->memory_usage += head->truesize - orig_truesize; 3502 if (head->len != orig_len) { 3503 flow->backlog += head->len - orig_len; 3504 tin->backlog_bytes += head->len - orig_len; 3505 } 3506 out: 3507 spin_unlock_bh(&fq->lock); 3508 3509 return ret; 3510 } 3511 3512 /* 3513 * Can be called while the sta lock is held. Anything that can cause packets to 3514 * be generated will cause deadlock! 3515 */ 3516 static ieee80211_tx_result 3517 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3518 struct sta_info *sta, u8 pn_offs, 3519 struct ieee80211_key *key, 3520 struct ieee80211_tx_data *tx) 3521 { 3522 struct sk_buff *skb = tx->skb; 3523 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3524 struct ieee80211_hdr *hdr = (void *)skb->data; 3525 u8 tid = IEEE80211_NUM_TIDS; 3526 3527 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3528 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3529 return TX_DROP; 3530 3531 if (key) 3532 info->control.hw_key = &key->conf; 3533 3534 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3535 3536 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3537 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3538 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3539 } else { 3540 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3541 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3542 sdata->sequence_number += 0x10; 3543 } 3544 3545 if (skb_shinfo(skb)->gso_size) 3546 sta->deflink.tx_stats.msdu[tid] += 3547 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3548 else 3549 sta->deflink.tx_stats.msdu[tid]++; 3550 3551 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3552 3553 /* statistics normally done by ieee80211_tx_h_stats (but that 3554 * has to consider fragmentation, so is more complex) 3555 */ 3556 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3557 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3558 3559 if (pn_offs) { 3560 u64 pn; 3561 u8 *crypto_hdr = skb->data + pn_offs; 3562 3563 switch (key->conf.cipher) { 3564 case WLAN_CIPHER_SUITE_CCMP: 3565 case WLAN_CIPHER_SUITE_CCMP_256: 3566 case WLAN_CIPHER_SUITE_GCMP: 3567 case WLAN_CIPHER_SUITE_GCMP_256: 3568 pn = atomic64_inc_return(&key->conf.tx_pn); 3569 crypto_hdr[0] = pn; 3570 crypto_hdr[1] = pn >> 8; 3571 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3572 crypto_hdr[4] = pn >> 16; 3573 crypto_hdr[5] = pn >> 24; 3574 crypto_hdr[6] = pn >> 32; 3575 crypto_hdr[7] = pn >> 40; 3576 break; 3577 } 3578 } 3579 3580 return TX_CONTINUE; 3581 } 3582 3583 static netdev_features_t 3584 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3585 { 3586 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3587 return sdata->vif.netdev_features; 3588 3589 if (!sdata->bss) 3590 return 0; 3591 3592 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3593 return sdata->vif.netdev_features; 3594 } 3595 3596 static struct sk_buff * 3597 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3598 { 3599 if (skb_is_gso(skb)) { 3600 struct sk_buff *segs; 3601 3602 segs = skb_gso_segment(skb, features); 3603 if (!segs) 3604 return skb; 3605 if (IS_ERR(segs)) 3606 goto free; 3607 3608 consume_skb(skb); 3609 return segs; 3610 } 3611 3612 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3613 goto free; 3614 3615 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3616 int ofs = skb_checksum_start_offset(skb); 3617 3618 if (skb->encapsulation) 3619 skb_set_inner_transport_header(skb, ofs); 3620 else 3621 skb_set_transport_header(skb, ofs); 3622 3623 if (skb_csum_hwoffload_help(skb, features)) 3624 goto free; 3625 } 3626 3627 skb_mark_not_on_list(skb); 3628 return skb; 3629 3630 free: 3631 kfree_skb(skb); 3632 return NULL; 3633 } 3634 3635 static void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3636 struct sta_info *sta, 3637 struct ieee80211_fast_tx *fast_tx, 3638 struct sk_buff *skb, u8 tid, bool ampdu) 3639 { 3640 struct ieee80211_local *local = sdata->local; 3641 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3642 struct ieee80211_tx_info *info; 3643 struct ieee80211_tx_data tx; 3644 ieee80211_tx_result r; 3645 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3646 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3647 struct ethhdr eth; 3648 3649 skb = skb_share_check(skb, GFP_ATOMIC); 3650 if (unlikely(!skb)) 3651 return; 3652 3653 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3654 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3655 return; 3656 3657 /* will not be crypto-handled beyond what we do here, so use false 3658 * as the may-encrypt argument for the resize to not account for 3659 * more room than we already have in 'extra_head' 3660 */ 3661 if (unlikely(ieee80211_skb_resize(sdata, skb, 3662 max_t(int, extra_head + hw_headroom - 3663 skb_headroom(skb), 0), 3664 ENCRYPT_NO))) 3665 goto free; 3666 3667 memcpy(ð, skb->data, ETH_HLEN - 2); 3668 hdr = skb_push(skb, extra_head); 3669 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3670 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3671 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3672 3673 info = IEEE80211_SKB_CB(skb); 3674 memset(info, 0, sizeof(*info)); 3675 info->band = fast_tx->band; 3676 info->control.vif = &sdata->vif; 3677 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3678 IEEE80211_TX_CTL_DONTFRAG; 3679 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3680 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3681 IEEE80211_TX_CTRL_MLO_LINK); 3682 3683 #ifdef CONFIG_MAC80211_DEBUGFS 3684 if (local->force_tx_status) 3685 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3686 #endif 3687 3688 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3689 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3690 *ieee80211_get_qos_ctl(hdr) = tid; 3691 } 3692 3693 __skb_queue_head_init(&tx.skbs); 3694 3695 tx.flags = IEEE80211_TX_UNICAST; 3696 tx.local = local; 3697 tx.sdata = sdata; 3698 tx.sta = sta; 3699 tx.key = fast_tx->key; 3700 3701 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3702 return; 3703 3704 tx.skb = skb; 3705 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3706 fast_tx->key, &tx); 3707 tx.skb = NULL; 3708 if (r == TX_DROP) 3709 goto free; 3710 3711 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3712 sdata = container_of(sdata->bss, 3713 struct ieee80211_sub_if_data, u.ap); 3714 3715 __skb_queue_tail(&tx.skbs, skb); 3716 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3717 return; 3718 3719 free: 3720 kfree_skb(skb); 3721 } 3722 3723 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3724 struct sta_info *sta, 3725 struct ieee80211_fast_tx *fast_tx, 3726 struct sk_buff *skb) 3727 { 3728 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3729 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3730 struct tid_ampdu_tx *tid_tx = NULL; 3731 struct sk_buff *next; 3732 u8 tid = IEEE80211_NUM_TIDS; 3733 3734 /* control port protocol needs a lot of special handling */ 3735 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3736 return false; 3737 3738 /* only RFC 1042 SNAP */ 3739 if (ethertype < ETH_P_802_3_MIN) 3740 return false; 3741 3742 /* don't handle TX status request here either */ 3743 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3744 return false; 3745 3746 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3747 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3748 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3749 if (tid_tx) { 3750 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3751 return false; 3752 if (tid_tx->timeout) 3753 tid_tx->last_tx = jiffies; 3754 } 3755 } 3756 3757 /* after this point (skb is modified) we cannot return false */ 3758 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3759 if (!skb) 3760 return true; 3761 3762 skb_list_walk_safe(skb, skb, next) { 3763 skb_mark_not_on_list(skb); 3764 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid, tid_tx); 3765 } 3766 3767 return true; 3768 } 3769 3770 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3771 struct ieee80211_txq *txq) 3772 { 3773 struct ieee80211_local *local = hw_to_local(hw); 3774 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3775 struct ieee80211_hdr *hdr; 3776 struct sk_buff *skb = NULL; 3777 struct fq *fq = &local->fq; 3778 struct fq_tin *tin = &txqi->tin; 3779 struct ieee80211_tx_info *info; 3780 struct ieee80211_tx_data tx; 3781 ieee80211_tx_result r; 3782 struct ieee80211_vif *vif = txq->vif; 3783 int q = vif->hw_queue[txq->ac]; 3784 bool q_stopped; 3785 3786 WARN_ON_ONCE(softirq_count() == 0); 3787 3788 if (!ieee80211_txq_airtime_check(hw, txq)) 3789 return NULL; 3790 3791 begin: 3792 spin_lock(&local->queue_stop_reason_lock); 3793 q_stopped = local->queue_stop_reasons[q]; 3794 spin_unlock(&local->queue_stop_reason_lock); 3795 3796 if (unlikely(q_stopped)) { 3797 /* mark for waking later */ 3798 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3799 return NULL; 3800 } 3801 3802 spin_lock_bh(&fq->lock); 3803 3804 /* Make sure fragments stay together. */ 3805 skb = __skb_dequeue(&txqi->frags); 3806 if (unlikely(skb)) { 3807 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3808 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3809 goto out; 3810 IEEE80211_SKB_CB(skb)->control.flags &= 3811 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3812 } else { 3813 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3814 goto out; 3815 3816 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3817 } 3818 3819 if (!skb) 3820 goto out; 3821 3822 spin_unlock_bh(&fq->lock); 3823 3824 hdr = (struct ieee80211_hdr *)skb->data; 3825 info = IEEE80211_SKB_CB(skb); 3826 3827 memset(&tx, 0, sizeof(tx)); 3828 __skb_queue_head_init(&tx.skbs); 3829 tx.local = local; 3830 tx.skb = skb; 3831 tx.sdata = vif_to_sdata(info->control.vif); 3832 3833 if (txq->sta) { 3834 tx.sta = container_of(txq->sta, struct sta_info, sta); 3835 /* 3836 * Drop unicast frames to unauthorised stations unless they are 3837 * injected frames or EAPOL frames from the local station. 3838 */ 3839 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3840 ieee80211_is_data(hdr->frame_control) && 3841 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3842 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3843 !is_multicast_ether_addr(hdr->addr1) && 3844 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3845 (!(info->control.flags & 3846 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3847 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3848 NULL)))) { 3849 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3850 ieee80211_free_txskb(&local->hw, skb); 3851 goto begin; 3852 } 3853 } 3854 3855 /* 3856 * The key can be removed while the packet was queued, so need to call 3857 * this here to get the current key. 3858 */ 3859 r = ieee80211_tx_h_select_key(&tx); 3860 if (r != TX_CONTINUE) { 3861 ieee80211_free_txskb(&local->hw, skb); 3862 goto begin; 3863 } 3864 3865 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3866 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3867 IEEE80211_TX_CTL_DONTFRAG); 3868 3869 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3870 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3871 r = ieee80211_tx_h_rate_ctrl(&tx); 3872 if (r != TX_CONTINUE) { 3873 ieee80211_free_txskb(&local->hw, skb); 3874 goto begin; 3875 } 3876 } 3877 goto encap_out; 3878 } 3879 3880 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3881 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3882 sta); 3883 u8 pn_offs = 0; 3884 3885 if (tx.key && 3886 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3887 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3888 3889 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3890 tx.key, &tx); 3891 if (r != TX_CONTINUE) { 3892 ieee80211_free_txskb(&local->hw, skb); 3893 goto begin; 3894 } 3895 } else { 3896 if (invoke_tx_handlers_late(&tx)) 3897 goto begin; 3898 3899 skb = __skb_dequeue(&tx.skbs); 3900 3901 if (!skb_queue_empty(&tx.skbs)) { 3902 spin_lock_bh(&fq->lock); 3903 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3904 spin_unlock_bh(&fq->lock); 3905 } 3906 } 3907 3908 if (skb_has_frag_list(skb) && 3909 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3910 if (skb_linearize(skb)) { 3911 ieee80211_free_txskb(&local->hw, skb); 3912 goto begin; 3913 } 3914 } 3915 3916 switch (tx.sdata->vif.type) { 3917 case NL80211_IFTYPE_MONITOR: 3918 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3919 vif = &tx.sdata->vif; 3920 break; 3921 } 3922 tx.sdata = rcu_dereference(local->monitor_sdata); 3923 if (tx.sdata) { 3924 vif = &tx.sdata->vif; 3925 info->hw_queue = 3926 vif->hw_queue[skb_get_queue_mapping(skb)]; 3927 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3928 ieee80211_free_txskb(&local->hw, skb); 3929 goto begin; 3930 } else { 3931 vif = NULL; 3932 } 3933 break; 3934 case NL80211_IFTYPE_AP_VLAN: 3935 tx.sdata = container_of(tx.sdata->bss, 3936 struct ieee80211_sub_if_data, u.ap); 3937 fallthrough; 3938 default: 3939 vif = &tx.sdata->vif; 3940 break; 3941 } 3942 3943 encap_out: 3944 IEEE80211_SKB_CB(skb)->control.vif = vif; 3945 3946 if (tx.sta && 3947 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3948 bool ampdu = txq->ac != IEEE80211_AC_VO; 3949 u32 airtime; 3950 3951 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3952 skb->len, ampdu); 3953 if (airtime) { 3954 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3955 ieee80211_sta_update_pending_airtime(local, tx.sta, 3956 txq->ac, 3957 airtime, 3958 false); 3959 } 3960 } 3961 3962 return skb; 3963 3964 out: 3965 spin_unlock_bh(&fq->lock); 3966 3967 return skb; 3968 } 3969 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3970 3971 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3972 { 3973 struct airtime_info *air_info = &sta->airtime[ac]; 3974 3975 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3976 } 3977 3978 static void 3979 ieee80211_txq_set_active(struct txq_info *txqi) 3980 { 3981 struct sta_info *sta; 3982 3983 if (!txqi->txq.sta) 3984 return; 3985 3986 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3987 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 3988 } 3989 3990 static bool 3991 ieee80211_txq_keep_active(struct txq_info *txqi) 3992 { 3993 struct sta_info *sta; 3994 u32 diff; 3995 3996 if (!txqi->txq.sta) 3997 return false; 3998 3999 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4000 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4001 return false; 4002 4003 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 4004 4005 return diff <= AIRTIME_ACTIVE_DURATION; 4006 } 4007 4008 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4009 { 4010 struct ieee80211_local *local = hw_to_local(hw); 4011 struct ieee80211_txq *ret = NULL; 4012 struct txq_info *txqi = NULL, *head = NULL; 4013 bool found_eligible_txq = false; 4014 4015 spin_lock_bh(&local->active_txq_lock[ac]); 4016 4017 if (!local->schedule_round[ac]) 4018 goto out; 4019 4020 begin: 4021 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4022 struct txq_info, 4023 schedule_order); 4024 if (!txqi) 4025 goto out; 4026 4027 if (txqi == head) { 4028 if (!found_eligible_txq) 4029 goto out; 4030 else 4031 found_eligible_txq = false; 4032 } 4033 4034 if (!head) 4035 head = txqi; 4036 4037 if (txqi->txq.sta) { 4038 struct sta_info *sta = container_of(txqi->txq.sta, 4039 struct sta_info, sta); 4040 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4041 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4042 4043 if (aql_check) 4044 found_eligible_txq = true; 4045 4046 if (deficit < 0) 4047 sta->airtime[txqi->txq.ac].deficit += 4048 sta->airtime_weight; 4049 4050 if (deficit < 0 || !aql_check) { 4051 list_move_tail(&txqi->schedule_order, 4052 &local->active_txqs[txqi->txq.ac]); 4053 goto begin; 4054 } 4055 } 4056 4057 if (txqi->schedule_round == local->schedule_round[ac]) 4058 goto out; 4059 4060 list_del_init(&txqi->schedule_order); 4061 txqi->schedule_round = local->schedule_round[ac]; 4062 ret = &txqi->txq; 4063 4064 out: 4065 spin_unlock_bh(&local->active_txq_lock[ac]); 4066 return ret; 4067 } 4068 EXPORT_SYMBOL(ieee80211_next_txq); 4069 4070 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4071 struct ieee80211_txq *txq, 4072 bool force) 4073 { 4074 struct ieee80211_local *local = hw_to_local(hw); 4075 struct txq_info *txqi = to_txq_info(txq); 4076 bool has_queue; 4077 4078 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4079 4080 has_queue = force || txq_has_queue(txq); 4081 if (list_empty(&txqi->schedule_order) && 4082 (has_queue || ieee80211_txq_keep_active(txqi))) { 4083 /* If airtime accounting is active, always enqueue STAs at the 4084 * head of the list to ensure that they only get moved to the 4085 * back by the airtime DRR scheduler once they have a negative 4086 * deficit. A station that already has a negative deficit will 4087 * get immediately moved to the back of the list on the next 4088 * call to ieee80211_next_txq(). 4089 */ 4090 if (txqi->txq.sta && local->airtime_flags && has_queue && 4091 wiphy_ext_feature_isset(local->hw.wiphy, 4092 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4093 list_add(&txqi->schedule_order, 4094 &local->active_txqs[txq->ac]); 4095 else 4096 list_add_tail(&txqi->schedule_order, 4097 &local->active_txqs[txq->ac]); 4098 if (has_queue) 4099 ieee80211_txq_set_active(txqi); 4100 } 4101 4102 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4103 } 4104 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4105 4106 DEFINE_STATIC_KEY_FALSE(aql_disable); 4107 4108 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4109 struct ieee80211_txq *txq) 4110 { 4111 struct sta_info *sta; 4112 struct ieee80211_local *local = hw_to_local(hw); 4113 4114 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4115 return true; 4116 4117 if (static_branch_unlikely(&aql_disable)) 4118 return true; 4119 4120 if (!txq->sta) 4121 return true; 4122 4123 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4124 return true; 4125 4126 sta = container_of(txq->sta, struct sta_info, sta); 4127 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4128 sta->airtime[txq->ac].aql_limit_low) 4129 return true; 4130 4131 if (atomic_read(&local->aql_total_pending_airtime) < 4132 local->aql_threshold && 4133 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4134 sta->airtime[txq->ac].aql_limit_high) 4135 return true; 4136 4137 return false; 4138 } 4139 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4140 4141 static bool 4142 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4143 { 4144 unsigned int num_txq = 0; 4145 struct txq_info *txq; 4146 u32 aql_limit; 4147 4148 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4149 return true; 4150 4151 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4152 num_txq++; 4153 4154 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4155 local->aql_txq_limit_high[ac]; 4156 4157 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4158 } 4159 4160 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4161 struct ieee80211_txq *txq) 4162 { 4163 struct ieee80211_local *local = hw_to_local(hw); 4164 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4165 struct sta_info *sta; 4166 u8 ac = txq->ac; 4167 4168 spin_lock_bh(&local->active_txq_lock[ac]); 4169 4170 if (!txqi->txq.sta) 4171 goto out; 4172 4173 if (list_empty(&txqi->schedule_order)) 4174 goto out; 4175 4176 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4177 goto out; 4178 4179 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4180 schedule_order) { 4181 if (iter == txqi) 4182 break; 4183 4184 if (!iter->txq.sta) { 4185 list_move_tail(&iter->schedule_order, 4186 &local->active_txqs[ac]); 4187 continue; 4188 } 4189 sta = container_of(iter->txq.sta, struct sta_info, sta); 4190 if (ieee80211_sta_deficit(sta, ac) < 0) 4191 sta->airtime[ac].deficit += sta->airtime_weight; 4192 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4193 } 4194 4195 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4196 if (sta->airtime[ac].deficit >= 0) 4197 goto out; 4198 4199 sta->airtime[ac].deficit += sta->airtime_weight; 4200 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4201 spin_unlock_bh(&local->active_txq_lock[ac]); 4202 4203 return false; 4204 out: 4205 if (!list_empty(&txqi->schedule_order)) 4206 list_del_init(&txqi->schedule_order); 4207 spin_unlock_bh(&local->active_txq_lock[ac]); 4208 4209 return true; 4210 } 4211 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4212 4213 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4214 { 4215 struct ieee80211_local *local = hw_to_local(hw); 4216 4217 spin_lock_bh(&local->active_txq_lock[ac]); 4218 4219 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4220 local->schedule_round[ac]++; 4221 if (!local->schedule_round[ac]) 4222 local->schedule_round[ac]++; 4223 } else { 4224 local->schedule_round[ac] = 0; 4225 } 4226 4227 spin_unlock_bh(&local->active_txq_lock[ac]); 4228 } 4229 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4230 4231 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4232 struct net_device *dev, 4233 u32 info_flags, 4234 u32 ctrl_flags, 4235 u64 *cookie) 4236 { 4237 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4238 struct ieee80211_local *local = sdata->local; 4239 struct sta_info *sta; 4240 struct sk_buff *next; 4241 int len = skb->len; 4242 4243 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4244 kfree_skb(skb); 4245 return; 4246 } 4247 4248 rcu_read_lock(); 4249 4250 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4251 goto out_free; 4252 4253 if (IS_ERR(sta)) 4254 sta = NULL; 4255 4256 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4257 ieee80211_aggr_check(sdata, sta, skb); 4258 4259 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4260 4261 if (sta) { 4262 struct ieee80211_fast_tx *fast_tx; 4263 4264 fast_tx = rcu_dereference(sta->fast_tx); 4265 4266 if (fast_tx && 4267 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4268 goto out; 4269 } 4270 4271 /* the frame could be fragmented, software-encrypted, and other 4272 * things so we cannot really handle checksum or GSO offload. 4273 * fix it up in software before we handle anything else. 4274 */ 4275 skb = ieee80211_tx_skb_fixup(skb, 0); 4276 if (!skb) { 4277 len = 0; 4278 goto out; 4279 } 4280 4281 skb_list_walk_safe(skb, skb, next) { 4282 skb_mark_not_on_list(skb); 4283 4284 if (skb->protocol == sdata->control_port_protocol) 4285 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4286 4287 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4288 sta, ctrl_flags, cookie); 4289 if (IS_ERR(skb)) { 4290 kfree_skb_list(next); 4291 goto out; 4292 } 4293 4294 dev_sw_netstats_tx_add(dev, 1, skb->len); 4295 4296 ieee80211_xmit(sdata, sta, skb); 4297 } 4298 goto out; 4299 out_free: 4300 kfree_skb(skb); 4301 len = 0; 4302 out: 4303 if (len) 4304 ieee80211_tpt_led_trig_tx(local, len); 4305 rcu_read_unlock(); 4306 } 4307 4308 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4309 { 4310 struct ethhdr *eth; 4311 int err; 4312 4313 err = skb_ensure_writable(skb, ETH_HLEN); 4314 if (unlikely(err)) 4315 return err; 4316 4317 eth = (void *)skb->data; 4318 ether_addr_copy(eth->h_dest, sta->sta.addr); 4319 4320 return 0; 4321 } 4322 4323 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4324 struct net_device *dev) 4325 { 4326 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4327 const struct ethhdr *eth = (void *)skb->data; 4328 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4329 __be16 ethertype; 4330 4331 switch (sdata->vif.type) { 4332 case NL80211_IFTYPE_AP_VLAN: 4333 if (sdata->u.vlan.sta) 4334 return false; 4335 if (sdata->wdev.use_4addr) 4336 return false; 4337 fallthrough; 4338 case NL80211_IFTYPE_AP: 4339 /* check runtime toggle for this bss */ 4340 if (!sdata->bss->multicast_to_unicast) 4341 return false; 4342 break; 4343 default: 4344 return false; 4345 } 4346 4347 /* multicast to unicast conversion only for some payload */ 4348 ethertype = eth->h_proto; 4349 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4350 ethertype = ethvlan->h_vlan_encapsulated_proto; 4351 switch (ethertype) { 4352 case htons(ETH_P_ARP): 4353 case htons(ETH_P_IP): 4354 case htons(ETH_P_IPV6): 4355 break; 4356 default: 4357 return false; 4358 } 4359 4360 return true; 4361 } 4362 4363 static void 4364 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4365 struct sk_buff_head *queue) 4366 { 4367 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4368 struct ieee80211_local *local = sdata->local; 4369 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4370 struct sta_info *sta, *first = NULL; 4371 struct sk_buff *cloned_skb; 4372 4373 rcu_read_lock(); 4374 4375 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4376 if (sdata != sta->sdata) 4377 /* AP-VLAN mismatch */ 4378 continue; 4379 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4380 /* do not send back to source */ 4381 continue; 4382 if (!first) { 4383 first = sta; 4384 continue; 4385 } 4386 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4387 if (!cloned_skb) 4388 goto multicast; 4389 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4390 dev_kfree_skb(cloned_skb); 4391 goto multicast; 4392 } 4393 __skb_queue_tail(queue, cloned_skb); 4394 } 4395 4396 if (likely(first)) { 4397 if (unlikely(ieee80211_change_da(skb, first))) 4398 goto multicast; 4399 __skb_queue_tail(queue, skb); 4400 } else { 4401 /* no STA connected, drop */ 4402 kfree_skb(skb); 4403 skb = NULL; 4404 } 4405 4406 goto out; 4407 multicast: 4408 __skb_queue_purge(queue); 4409 __skb_queue_tail(queue, skb); 4410 out: 4411 rcu_read_unlock(); 4412 } 4413 4414 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4415 struct sk_buff *skb, u32 ctrl_flags, 4416 unsigned int link_id) 4417 { 4418 struct sk_buff *out; 4419 4420 out = skb_copy(skb, GFP_ATOMIC); 4421 if (!out) 4422 return; 4423 4424 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4425 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4426 } 4427 4428 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4429 struct sk_buff *skb) 4430 { 4431 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4432 unsigned long links = sdata->vif.valid_links; 4433 unsigned int link; 4434 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4435 4436 if (hweight16(links) == 1) { 4437 ctrl_flags |= u32_encode_bits(ffs(links) - 1, 4438 IEEE80211_TX_CTRL_MLO_LINK); 4439 4440 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4441 NULL); 4442 return; 4443 } 4444 4445 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4446 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4447 ctrl_flags = 0; 4448 } 4449 kfree_skb(skb); 4450 } 4451 4452 /** 4453 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4454 * @skb: packet to be sent 4455 * @dev: incoming interface 4456 * 4457 * On failure skb will be freed. 4458 */ 4459 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4460 struct net_device *dev) 4461 { 4462 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4463 const struct ethhdr *eth = (void *)skb->data; 4464 4465 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4466 goto normal; 4467 4468 if (unlikely(!ieee80211_sdata_running(sdata))) { 4469 kfree_skb(skb); 4470 return NETDEV_TX_OK; 4471 } 4472 4473 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4474 struct sk_buff_head queue; 4475 4476 __skb_queue_head_init(&queue); 4477 ieee80211_convert_to_unicast(skb, dev, &queue); 4478 while ((skb = __skb_dequeue(&queue))) 4479 __ieee80211_subif_start_xmit(skb, dev, 0, 4480 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4481 NULL); 4482 } else if (sdata->vif.valid_links && 4483 sdata->vif.type == NL80211_IFTYPE_AP && 4484 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4485 ieee80211_mlo_multicast_tx(dev, skb); 4486 } else { 4487 normal: 4488 __ieee80211_subif_start_xmit(skb, dev, 0, 4489 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4490 NULL); 4491 } 4492 4493 return NETDEV_TX_OK; 4494 } 4495 4496 4497 4498 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4499 struct sk_buff *skb, struct sta_info *sta, 4500 bool txpending) 4501 { 4502 struct ieee80211_local *local = sdata->local; 4503 struct ieee80211_tx_control control = {}; 4504 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4505 struct ieee80211_sta *pubsta = NULL; 4506 unsigned long flags; 4507 int q = info->hw_queue; 4508 4509 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4510 4511 if (local->queue_stop_reasons[q] || 4512 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4513 if (txpending) 4514 skb_queue_head(&local->pending[q], skb); 4515 else 4516 skb_queue_tail(&local->pending[q], skb); 4517 4518 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4519 4520 return false; 4521 } 4522 4523 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4524 4525 if (sta && sta->uploaded) 4526 pubsta = &sta->sta; 4527 4528 control.sta = pubsta; 4529 4530 drv_tx(local, &control, skb); 4531 4532 return true; 4533 } 4534 4535 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4536 struct sk_buff *skb, struct sta_info *sta, 4537 bool txpending) 4538 { 4539 struct ieee80211_local *local = sdata->local; 4540 struct sk_buff *next; 4541 bool ret = true; 4542 4543 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4544 return true; 4545 4546 skb_list_walk_safe(skb, skb, next) { 4547 skb_mark_not_on_list(skb); 4548 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4549 ret = false; 4550 } 4551 4552 return ret; 4553 } 4554 4555 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4556 struct net_device *dev, struct sta_info *sta, 4557 struct ieee80211_key *key, struct sk_buff *skb) 4558 { 4559 struct ieee80211_tx_info *info; 4560 struct ieee80211_local *local = sdata->local; 4561 struct tid_ampdu_tx *tid_tx; 4562 struct sk_buff *seg, *next; 4563 unsigned int skbs = 0, len = 0; 4564 u16 queue; 4565 u8 tid; 4566 4567 queue = ieee80211_select_queue(sdata, sta, skb); 4568 skb_set_queue_mapping(skb, queue); 4569 4570 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4571 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4572 goto out_free; 4573 4574 skb = skb_share_check(skb, GFP_ATOMIC); 4575 if (unlikely(!skb)) 4576 return; 4577 4578 ieee80211_aggr_check(sdata, sta, skb); 4579 4580 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4581 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4582 if (tid_tx) { 4583 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4584 /* fall back to non-offload slow path */ 4585 __ieee80211_subif_start_xmit(skb, dev, 0, 4586 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4587 NULL); 4588 return; 4589 } 4590 4591 if (tid_tx->timeout) 4592 tid_tx->last_tx = jiffies; 4593 } 4594 4595 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4596 if (!skb) 4597 return; 4598 4599 info = IEEE80211_SKB_CB(skb); 4600 memset(info, 0, sizeof(*info)); 4601 4602 info->hw_queue = sdata->vif.hw_queue[queue]; 4603 4604 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4605 sdata = container_of(sdata->bss, 4606 struct ieee80211_sub_if_data, u.ap); 4607 4608 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4609 info->control.vif = &sdata->vif; 4610 4611 if (key) 4612 info->control.hw_key = &key->conf; 4613 4614 skb_list_walk_safe(skb, seg, next) { 4615 skbs++; 4616 len += seg->len; 4617 if (seg != skb) 4618 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4619 } 4620 4621 if (unlikely(skb->sk && 4622 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4623 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4624 &info->flags, NULL); 4625 4626 dev_sw_netstats_tx_add(dev, skbs, len); 4627 sta->deflink.tx_stats.packets[queue] += skbs; 4628 sta->deflink.tx_stats.bytes[queue] += len; 4629 4630 ieee80211_tpt_led_trig_tx(local, len); 4631 4632 ieee80211_tx_8023(sdata, skb, sta, false); 4633 4634 return; 4635 4636 out_free: 4637 kfree_skb(skb); 4638 } 4639 4640 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4641 struct net_device *dev) 4642 { 4643 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4644 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4645 struct ieee80211_key *key; 4646 struct sta_info *sta; 4647 4648 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4649 kfree_skb(skb); 4650 return NETDEV_TX_OK; 4651 } 4652 4653 rcu_read_lock(); 4654 4655 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4656 kfree_skb(skb); 4657 goto out; 4658 } 4659 4660 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4661 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4662 sdata->control_port_protocol == ehdr->h_proto)) 4663 goto skip_offload; 4664 4665 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4666 if (!key) 4667 key = rcu_dereference(sdata->default_unicast_key); 4668 4669 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4670 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4671 goto skip_offload; 4672 4673 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4674 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4675 goto out; 4676 4677 skip_offload: 4678 ieee80211_subif_start_xmit(skb, dev); 4679 out: 4680 rcu_read_unlock(); 4681 4682 return NETDEV_TX_OK; 4683 } 4684 4685 struct sk_buff * 4686 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4687 struct sk_buff *skb, u32 info_flags) 4688 { 4689 struct ieee80211_hdr *hdr; 4690 struct ieee80211_tx_data tx = { 4691 .local = sdata->local, 4692 .sdata = sdata, 4693 }; 4694 struct sta_info *sta; 4695 4696 rcu_read_lock(); 4697 4698 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4699 kfree_skb(skb); 4700 skb = ERR_PTR(-EINVAL); 4701 goto out; 4702 } 4703 4704 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4705 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4706 if (IS_ERR(skb)) 4707 goto out; 4708 4709 hdr = (void *)skb->data; 4710 tx.sta = sta_info_get(sdata, hdr->addr1); 4711 tx.skb = skb; 4712 4713 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4714 rcu_read_unlock(); 4715 kfree_skb(skb); 4716 return ERR_PTR(-EINVAL); 4717 } 4718 4719 out: 4720 rcu_read_unlock(); 4721 return skb; 4722 } 4723 4724 /* 4725 * ieee80211_clear_tx_pending may not be called in a context where 4726 * it is possible that it packets could come in again. 4727 */ 4728 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4729 { 4730 struct sk_buff *skb; 4731 int i; 4732 4733 for (i = 0; i < local->hw.queues; i++) { 4734 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4735 ieee80211_free_txskb(&local->hw, skb); 4736 } 4737 } 4738 4739 /* 4740 * Returns false if the frame couldn't be transmitted but was queued instead, 4741 * which in this case means re-queued -- take as an indication to stop sending 4742 * more pending frames. 4743 */ 4744 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4745 struct sk_buff *skb) 4746 { 4747 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4748 struct ieee80211_sub_if_data *sdata; 4749 struct sta_info *sta; 4750 struct ieee80211_hdr *hdr; 4751 bool result; 4752 struct ieee80211_chanctx_conf *chanctx_conf; 4753 4754 sdata = vif_to_sdata(info->control.vif); 4755 4756 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4757 /* update band only for non-MLD */ 4758 if (!sdata->vif.valid_links) { 4759 chanctx_conf = 4760 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4761 if (unlikely(!chanctx_conf)) { 4762 dev_kfree_skb(skb); 4763 return true; 4764 } 4765 info->band = chanctx_conf->def.chan->band; 4766 } 4767 result = ieee80211_tx(sdata, NULL, skb, true); 4768 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4769 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4770 dev_kfree_skb(skb); 4771 return true; 4772 } 4773 4774 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4775 sta = NULL; 4776 4777 result = ieee80211_tx_8023(sdata, skb, sta, true); 4778 } else { 4779 struct sk_buff_head skbs; 4780 4781 __skb_queue_head_init(&skbs); 4782 __skb_queue_tail(&skbs, skb); 4783 4784 hdr = (struct ieee80211_hdr *)skb->data; 4785 sta = sta_info_get(sdata, hdr->addr1); 4786 4787 result = __ieee80211_tx(local, &skbs, sta, true); 4788 } 4789 4790 return result; 4791 } 4792 4793 /* 4794 * Transmit all pending packets. Called from tasklet. 4795 */ 4796 void ieee80211_tx_pending(struct tasklet_struct *t) 4797 { 4798 struct ieee80211_local *local = from_tasklet(local, t, 4799 tx_pending_tasklet); 4800 unsigned long flags; 4801 int i; 4802 bool txok; 4803 4804 rcu_read_lock(); 4805 4806 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4807 for (i = 0; i < local->hw.queues; i++) { 4808 /* 4809 * If queue is stopped by something other than due to pending 4810 * frames, or we have no pending frames, proceed to next queue. 4811 */ 4812 if (local->queue_stop_reasons[i] || 4813 skb_queue_empty(&local->pending[i])) 4814 continue; 4815 4816 while (!skb_queue_empty(&local->pending[i])) { 4817 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4818 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4819 4820 if (WARN_ON(!info->control.vif)) { 4821 ieee80211_free_txskb(&local->hw, skb); 4822 continue; 4823 } 4824 4825 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4826 flags); 4827 4828 txok = ieee80211_tx_pending_skb(local, skb); 4829 spin_lock_irqsave(&local->queue_stop_reason_lock, 4830 flags); 4831 if (!txok) 4832 break; 4833 } 4834 } 4835 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4836 4837 rcu_read_unlock(); 4838 } 4839 4840 /* functions for drivers to get certain frames */ 4841 4842 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4843 struct ieee80211_link_data *link, 4844 struct ps_data *ps, struct sk_buff *skb, 4845 bool is_template) 4846 { 4847 u8 *pos, *tim; 4848 int aid0 = 0; 4849 int i, have_bits = 0, n1, n2; 4850 struct ieee80211_bss_conf *link_conf = link->conf; 4851 4852 /* Generate bitmap for TIM only if there are any STAs in power save 4853 * mode. */ 4854 if (atomic_read(&ps->num_sta_ps) > 0) 4855 /* in the hope that this is faster than 4856 * checking byte-for-byte */ 4857 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4858 IEEE80211_MAX_AID+1); 4859 if (!is_template) { 4860 if (ps->dtim_count == 0) 4861 ps->dtim_count = link_conf->dtim_period - 1; 4862 else 4863 ps->dtim_count--; 4864 } 4865 4866 tim = pos = skb_put(skb, 5); 4867 *pos++ = WLAN_EID_TIM; 4868 *pos++ = 3; 4869 *pos++ = ps->dtim_count; 4870 *pos++ = link_conf->dtim_period; 4871 4872 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4873 aid0 = 1; 4874 4875 ps->dtim_bc_mc = aid0 == 1; 4876 4877 if (have_bits) { 4878 /* Find largest even number N1 so that bits numbered 1 through 4879 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4880 * (N2 + 1) x 8 through 2007 are 0. */ 4881 n1 = 0; 4882 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4883 if (ps->tim[i]) { 4884 n1 = i & 0xfe; 4885 break; 4886 } 4887 } 4888 n2 = n1; 4889 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4890 if (ps->tim[i]) { 4891 n2 = i; 4892 break; 4893 } 4894 } 4895 4896 /* Bitmap control */ 4897 *pos++ = n1 | aid0; 4898 /* Part Virt Bitmap */ 4899 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4900 4901 tim[1] = n2 - n1 + 4; 4902 } else { 4903 *pos++ = aid0; /* Bitmap control */ 4904 4905 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4906 tim[1] = 4; 4907 /* Part Virt Bitmap */ 4908 skb_put_u8(skb, 0); 4909 } 4910 } 4911 } 4912 4913 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4914 struct ieee80211_link_data *link, 4915 struct ps_data *ps, struct sk_buff *skb, 4916 bool is_template) 4917 { 4918 struct ieee80211_local *local = sdata->local; 4919 4920 /* 4921 * Not very nice, but we want to allow the driver to call 4922 * ieee80211_beacon_get() as a response to the set_tim() 4923 * callback. That, however, is already invoked under the 4924 * sta_lock to guarantee consistent and race-free update 4925 * of the tim bitmap in mac80211 and the driver. 4926 */ 4927 if (local->tim_in_locked_section) { 4928 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4929 } else { 4930 spin_lock_bh(&local->tim_lock); 4931 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4932 spin_unlock_bh(&local->tim_lock); 4933 } 4934 4935 return 0; 4936 } 4937 4938 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4939 struct beacon_data *beacon, 4940 struct ieee80211_link_data *link) 4941 { 4942 u8 *beacon_data, count, max_count = 1; 4943 struct probe_resp *resp; 4944 size_t beacon_data_len; 4945 u16 *bcn_offsets; 4946 int i; 4947 4948 switch (sdata->vif.type) { 4949 case NL80211_IFTYPE_AP: 4950 beacon_data = beacon->tail; 4951 beacon_data_len = beacon->tail_len; 4952 break; 4953 case NL80211_IFTYPE_ADHOC: 4954 beacon_data = beacon->head; 4955 beacon_data_len = beacon->head_len; 4956 break; 4957 case NL80211_IFTYPE_MESH_POINT: 4958 beacon_data = beacon->head; 4959 beacon_data_len = beacon->head_len; 4960 break; 4961 default: 4962 return; 4963 } 4964 4965 resp = rcu_dereference(link->u.ap.probe_resp); 4966 4967 bcn_offsets = beacon->cntdwn_counter_offsets; 4968 count = beacon->cntdwn_current_counter; 4969 if (link->conf->csa_active) 4970 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4971 4972 for (i = 0; i < max_count; ++i) { 4973 if (bcn_offsets[i]) { 4974 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 4975 return; 4976 beacon_data[bcn_offsets[i]] = count; 4977 } 4978 4979 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4980 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4981 4982 resp->data[resp_offsets[i]] = count; 4983 } 4984 } 4985 } 4986 4987 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4988 { 4989 beacon->cntdwn_current_counter--; 4990 4991 /* the counter should never reach 0 */ 4992 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4993 4994 return beacon->cntdwn_current_counter; 4995 } 4996 4997 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4998 { 4999 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5000 struct beacon_data *beacon = NULL; 5001 u8 count = 0; 5002 5003 rcu_read_lock(); 5004 5005 if (sdata->vif.type == NL80211_IFTYPE_AP) 5006 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5007 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5008 beacon = rcu_dereference(sdata->u.ibss.presp); 5009 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5010 beacon = rcu_dereference(sdata->u.mesh.beacon); 5011 5012 if (!beacon) 5013 goto unlock; 5014 5015 count = __ieee80211_beacon_update_cntdwn(beacon); 5016 5017 unlock: 5018 rcu_read_unlock(); 5019 return count; 5020 } 5021 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5022 5023 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5024 { 5025 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5026 struct beacon_data *beacon = NULL; 5027 5028 rcu_read_lock(); 5029 5030 if (sdata->vif.type == NL80211_IFTYPE_AP) 5031 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5032 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5033 beacon = rcu_dereference(sdata->u.ibss.presp); 5034 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5035 beacon = rcu_dereference(sdata->u.mesh.beacon); 5036 5037 if (!beacon) 5038 goto unlock; 5039 5040 if (counter < beacon->cntdwn_current_counter) 5041 beacon->cntdwn_current_counter = counter; 5042 5043 unlock: 5044 rcu_read_unlock(); 5045 } 5046 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5047 5048 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 5049 { 5050 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5051 struct beacon_data *beacon = NULL; 5052 u8 *beacon_data; 5053 size_t beacon_data_len; 5054 int ret = false; 5055 5056 if (!ieee80211_sdata_running(sdata)) 5057 return false; 5058 5059 rcu_read_lock(); 5060 if (vif->type == NL80211_IFTYPE_AP) { 5061 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5062 if (WARN_ON(!beacon || !beacon->tail)) 5063 goto out; 5064 beacon_data = beacon->tail; 5065 beacon_data_len = beacon->tail_len; 5066 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5067 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5068 5069 beacon = rcu_dereference(ifibss->presp); 5070 if (!beacon) 5071 goto out; 5072 5073 beacon_data = beacon->head; 5074 beacon_data_len = beacon->head_len; 5075 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5076 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5077 5078 beacon = rcu_dereference(ifmsh->beacon); 5079 if (!beacon) 5080 goto out; 5081 5082 beacon_data = beacon->head; 5083 beacon_data_len = beacon->head_len; 5084 } else { 5085 WARN_ON(1); 5086 goto out; 5087 } 5088 5089 if (!beacon->cntdwn_counter_offsets[0]) 5090 goto out; 5091 5092 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5093 goto out; 5094 5095 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5096 ret = true; 5097 5098 out: 5099 rcu_read_unlock(); 5100 5101 return ret; 5102 } 5103 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5104 5105 static int ieee80211_beacon_protect(struct sk_buff *skb, 5106 struct ieee80211_local *local, 5107 struct ieee80211_sub_if_data *sdata, 5108 struct ieee80211_link_data *link) 5109 { 5110 ieee80211_tx_result res; 5111 struct ieee80211_tx_data tx; 5112 struct sk_buff *check_skb; 5113 5114 memset(&tx, 0, sizeof(tx)); 5115 tx.key = rcu_dereference(link->default_beacon_key); 5116 if (!tx.key) 5117 return 0; 5118 tx.local = local; 5119 tx.sdata = sdata; 5120 __skb_queue_head_init(&tx.skbs); 5121 __skb_queue_tail(&tx.skbs, skb); 5122 res = ieee80211_tx_h_encrypt(&tx); 5123 check_skb = __skb_dequeue(&tx.skbs); 5124 /* we may crash after this, but it'd be a bug in crypto */ 5125 WARN_ON(check_skb != skb); 5126 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5127 return -EINVAL; 5128 5129 return 0; 5130 } 5131 5132 static void 5133 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5134 struct ieee80211_vif *vif, 5135 struct ieee80211_link_data *link, 5136 struct ieee80211_mutable_offsets *offs, 5137 struct beacon_data *beacon, 5138 struct sk_buff *skb, 5139 struct ieee80211_chanctx_conf *chanctx_conf, 5140 u16 csa_off_base) 5141 { 5142 struct ieee80211_local *local = hw_to_local(hw); 5143 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5144 struct ieee80211_tx_info *info; 5145 enum nl80211_band band; 5146 struct ieee80211_tx_rate_control txrc; 5147 5148 /* CSA offsets */ 5149 if (offs && beacon) { 5150 u16 i; 5151 5152 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5153 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5154 5155 if (!csa_off) 5156 continue; 5157 5158 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5159 } 5160 } 5161 5162 band = chanctx_conf->def.chan->band; 5163 info = IEEE80211_SKB_CB(skb); 5164 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5165 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5166 info->band = band; 5167 5168 memset(&txrc, 0, sizeof(txrc)); 5169 txrc.hw = hw; 5170 txrc.sband = local->hw.wiphy->bands[band]; 5171 txrc.bss_conf = link->conf; 5172 txrc.skb = skb; 5173 txrc.reported_rate.idx = -1; 5174 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5175 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5176 else 5177 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5178 txrc.bss = true; 5179 rate_control_get_rate(sdata, NULL, &txrc); 5180 5181 info->control.vif = vif; 5182 info->control.flags |= u32_encode_bits(link->link_id, 5183 IEEE80211_TX_CTRL_MLO_LINK); 5184 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5185 IEEE80211_TX_CTL_ASSIGN_SEQ | 5186 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5187 } 5188 5189 static void 5190 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon) 5191 { 5192 int i; 5193 5194 if (!beacon->mbssid_ies) 5195 return; 5196 5197 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5198 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5199 beacon->mbssid_ies->elem[i].len); 5200 } 5201 5202 static struct sk_buff * 5203 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5204 struct ieee80211_vif *vif, 5205 struct ieee80211_link_data *link, 5206 struct ieee80211_mutable_offsets *offs, 5207 bool is_template, 5208 struct beacon_data *beacon, 5209 struct ieee80211_chanctx_conf *chanctx_conf) 5210 { 5211 struct ieee80211_local *local = hw_to_local(hw); 5212 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5213 struct ieee80211_if_ap *ap = &sdata->u.ap; 5214 struct sk_buff *skb = NULL; 5215 u16 csa_off_base = 0; 5216 int mbssid_len; 5217 5218 if (beacon->cntdwn_counter_offsets[0]) { 5219 if (!is_template) 5220 ieee80211_beacon_update_cntdwn(vif); 5221 5222 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5223 } 5224 5225 /* headroom, head length, 5226 * tail length, maximum TIM length and multiple BSSID length 5227 */ 5228 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies); 5229 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5230 beacon->tail_len + 256 + 5231 local->hw.extra_beacon_tailroom + mbssid_len); 5232 if (!skb) 5233 return NULL; 5234 5235 skb_reserve(skb, local->tx_headroom); 5236 skb_put_data(skb, beacon->head, beacon->head_len); 5237 5238 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5239 5240 if (offs) { 5241 offs->tim_offset = beacon->head_len; 5242 offs->tim_length = skb->len - beacon->head_len; 5243 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5244 5245 if (mbssid_len) { 5246 ieee80211_beacon_add_mbssid(skb, beacon); 5247 offs->mbssid_off = skb->len - mbssid_len; 5248 } 5249 5250 /* for AP the csa offsets are from tail */ 5251 csa_off_base = skb->len; 5252 } 5253 5254 if (beacon->tail) 5255 skb_put_data(skb, beacon->tail, beacon->tail_len); 5256 5257 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5258 return NULL; 5259 5260 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5261 chanctx_conf, csa_off_base); 5262 return skb; 5263 } 5264 5265 static struct sk_buff * 5266 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5267 struct ieee80211_vif *vif, 5268 struct ieee80211_mutable_offsets *offs, 5269 bool is_template, 5270 unsigned int link_id) 5271 { 5272 struct ieee80211_local *local = hw_to_local(hw); 5273 struct beacon_data *beacon = NULL; 5274 struct sk_buff *skb = NULL; 5275 struct ieee80211_sub_if_data *sdata = NULL; 5276 struct ieee80211_chanctx_conf *chanctx_conf; 5277 struct ieee80211_link_data *link; 5278 5279 rcu_read_lock(); 5280 5281 sdata = vif_to_sdata(vif); 5282 link = rcu_dereference(sdata->link[link_id]); 5283 if (!link) 5284 goto out; 5285 chanctx_conf = 5286 rcu_dereference(link->conf->chanctx_conf); 5287 5288 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5289 goto out; 5290 5291 if (offs) 5292 memset(offs, 0, sizeof(*offs)); 5293 5294 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5295 beacon = rcu_dereference(link->u.ap.beacon); 5296 if (!beacon) 5297 goto out; 5298 5299 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template, 5300 beacon, chanctx_conf); 5301 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5302 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5303 struct ieee80211_hdr *hdr; 5304 5305 beacon = rcu_dereference(ifibss->presp); 5306 if (!beacon) 5307 goto out; 5308 5309 if (beacon->cntdwn_counter_offsets[0]) { 5310 if (!is_template) 5311 __ieee80211_beacon_update_cntdwn(beacon); 5312 5313 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5314 } 5315 5316 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5317 local->hw.extra_beacon_tailroom); 5318 if (!skb) 5319 goto out; 5320 skb_reserve(skb, local->tx_headroom); 5321 skb_put_data(skb, beacon->head, beacon->head_len); 5322 5323 hdr = (struct ieee80211_hdr *) skb->data; 5324 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5325 IEEE80211_STYPE_BEACON); 5326 5327 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5328 chanctx_conf, 0); 5329 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5330 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5331 5332 beacon = rcu_dereference(ifmsh->beacon); 5333 if (!beacon) 5334 goto out; 5335 5336 if (beacon->cntdwn_counter_offsets[0]) { 5337 if (!is_template) 5338 /* TODO: For mesh csa_counter is in TU, so 5339 * decrementing it by one isn't correct, but 5340 * for now we leave it consistent with overall 5341 * mac80211's behavior. 5342 */ 5343 __ieee80211_beacon_update_cntdwn(beacon); 5344 5345 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5346 } 5347 5348 if (ifmsh->sync_ops) 5349 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5350 5351 skb = dev_alloc_skb(local->tx_headroom + 5352 beacon->head_len + 5353 256 + /* TIM IE */ 5354 beacon->tail_len + 5355 local->hw.extra_beacon_tailroom); 5356 if (!skb) 5357 goto out; 5358 skb_reserve(skb, local->tx_headroom); 5359 skb_put_data(skb, beacon->head, beacon->head_len); 5360 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5361 is_template); 5362 5363 if (offs) { 5364 offs->tim_offset = beacon->head_len; 5365 offs->tim_length = skb->len - beacon->head_len; 5366 } 5367 5368 skb_put_data(skb, beacon->tail, beacon->tail_len); 5369 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5370 chanctx_conf, 0); 5371 } else { 5372 WARN_ON(1); 5373 goto out; 5374 } 5375 5376 out: 5377 rcu_read_unlock(); 5378 return skb; 5379 5380 } 5381 5382 struct sk_buff * 5383 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5384 struct ieee80211_vif *vif, 5385 struct ieee80211_mutable_offsets *offs, 5386 unsigned int link_id) 5387 { 5388 return __ieee80211_beacon_get(hw, vif, offs, true, link_id); 5389 } 5390 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5391 5392 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5393 struct ieee80211_vif *vif, 5394 u16 *tim_offset, u16 *tim_length, 5395 unsigned int link_id) 5396 { 5397 struct ieee80211_mutable_offsets offs = {}; 5398 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5399 link_id); 5400 struct sk_buff *copy; 5401 int shift; 5402 5403 if (!bcn) 5404 return bcn; 5405 5406 if (tim_offset) 5407 *tim_offset = offs.tim_offset; 5408 5409 if (tim_length) 5410 *tim_length = offs.tim_length; 5411 5412 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5413 !hw_to_local(hw)->monitors) 5414 return bcn; 5415 5416 /* send a copy to monitor interfaces */ 5417 copy = skb_copy(bcn, GFP_ATOMIC); 5418 if (!copy) 5419 return bcn; 5420 5421 shift = ieee80211_vif_get_shift(vif); 5422 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5423 5424 return bcn; 5425 } 5426 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5427 5428 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5429 struct ieee80211_vif *vif) 5430 { 5431 struct sk_buff *skb = NULL; 5432 struct probe_resp *presp = NULL; 5433 struct ieee80211_hdr *hdr; 5434 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5435 5436 if (sdata->vif.type != NL80211_IFTYPE_AP) 5437 return NULL; 5438 5439 rcu_read_lock(); 5440 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5441 if (!presp) 5442 goto out; 5443 5444 skb = dev_alloc_skb(presp->len); 5445 if (!skb) 5446 goto out; 5447 5448 skb_put_data(skb, presp->data, presp->len); 5449 5450 hdr = (struct ieee80211_hdr *) skb->data; 5451 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5452 5453 out: 5454 rcu_read_unlock(); 5455 return skb; 5456 } 5457 EXPORT_SYMBOL(ieee80211_proberesp_get); 5458 5459 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5460 struct ieee80211_vif *vif) 5461 { 5462 struct sk_buff *skb = NULL; 5463 struct fils_discovery_data *tmpl = NULL; 5464 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5465 5466 if (sdata->vif.type != NL80211_IFTYPE_AP) 5467 return NULL; 5468 5469 rcu_read_lock(); 5470 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5471 if (!tmpl) { 5472 rcu_read_unlock(); 5473 return NULL; 5474 } 5475 5476 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5477 if (skb) { 5478 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5479 skb_put_data(skb, tmpl->data, tmpl->len); 5480 } 5481 5482 rcu_read_unlock(); 5483 return skb; 5484 } 5485 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5486 5487 struct sk_buff * 5488 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5489 struct ieee80211_vif *vif) 5490 { 5491 struct sk_buff *skb = NULL; 5492 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5493 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5494 5495 if (sdata->vif.type != NL80211_IFTYPE_AP) 5496 return NULL; 5497 5498 rcu_read_lock(); 5499 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5500 if (!tmpl) { 5501 rcu_read_unlock(); 5502 return NULL; 5503 } 5504 5505 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5506 if (skb) { 5507 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5508 skb_put_data(skb, tmpl->data, tmpl->len); 5509 } 5510 5511 rcu_read_unlock(); 5512 return skb; 5513 } 5514 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5515 5516 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5517 struct ieee80211_vif *vif) 5518 { 5519 struct ieee80211_sub_if_data *sdata; 5520 struct ieee80211_pspoll *pspoll; 5521 struct ieee80211_local *local; 5522 struct sk_buff *skb; 5523 5524 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5525 return NULL; 5526 5527 sdata = vif_to_sdata(vif); 5528 local = sdata->local; 5529 5530 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5531 if (!skb) 5532 return NULL; 5533 5534 skb_reserve(skb, local->hw.extra_tx_headroom); 5535 5536 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5537 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5538 IEEE80211_STYPE_PSPOLL); 5539 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5540 5541 /* aid in PS-Poll has its two MSBs each set to 1 */ 5542 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5543 5544 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5545 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5546 5547 return skb; 5548 } 5549 EXPORT_SYMBOL(ieee80211_pspoll_get); 5550 5551 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5552 struct ieee80211_vif *vif, 5553 int link_id, bool qos_ok) 5554 { 5555 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5556 struct ieee80211_local *local = sdata->local; 5557 struct ieee80211_link_data *link = NULL; 5558 struct ieee80211_hdr_3addr *nullfunc; 5559 struct sk_buff *skb; 5560 bool qos = false; 5561 5562 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5563 return NULL; 5564 5565 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5566 sizeof(*nullfunc) + 2); 5567 if (!skb) 5568 return NULL; 5569 5570 rcu_read_lock(); 5571 if (qos_ok) { 5572 struct sta_info *sta; 5573 5574 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5575 qos = sta && sta->sta.wme; 5576 } 5577 5578 if (link_id >= 0) { 5579 link = rcu_dereference(sdata->link[link_id]); 5580 if (WARN_ON_ONCE(!link)) { 5581 rcu_read_unlock(); 5582 kfree_skb(skb); 5583 return NULL; 5584 } 5585 } 5586 5587 skb_reserve(skb, local->hw.extra_tx_headroom); 5588 5589 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5590 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5591 IEEE80211_STYPE_NULLFUNC | 5592 IEEE80211_FCTL_TODS); 5593 if (qos) { 5594 __le16 qoshdr = cpu_to_le16(7); 5595 5596 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5597 IEEE80211_STYPE_NULLFUNC) != 5598 IEEE80211_STYPE_QOS_NULLFUNC); 5599 nullfunc->frame_control |= 5600 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5601 skb->priority = 7; 5602 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5603 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5604 } 5605 5606 if (link) { 5607 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5608 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5609 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5610 } else { 5611 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5612 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5613 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5614 } 5615 rcu_read_unlock(); 5616 5617 return skb; 5618 } 5619 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5620 5621 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5622 const u8 *src_addr, 5623 const u8 *ssid, size_t ssid_len, 5624 size_t tailroom) 5625 { 5626 struct ieee80211_local *local = hw_to_local(hw); 5627 struct ieee80211_hdr_3addr *hdr; 5628 struct sk_buff *skb; 5629 size_t ie_ssid_len; 5630 u8 *pos; 5631 5632 ie_ssid_len = 2 + ssid_len; 5633 5634 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5635 ie_ssid_len + tailroom); 5636 if (!skb) 5637 return NULL; 5638 5639 skb_reserve(skb, local->hw.extra_tx_headroom); 5640 5641 hdr = skb_put_zero(skb, sizeof(*hdr)); 5642 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5643 IEEE80211_STYPE_PROBE_REQ); 5644 eth_broadcast_addr(hdr->addr1); 5645 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5646 eth_broadcast_addr(hdr->addr3); 5647 5648 pos = skb_put(skb, ie_ssid_len); 5649 *pos++ = WLAN_EID_SSID; 5650 *pos++ = ssid_len; 5651 if (ssid_len) 5652 memcpy(pos, ssid, ssid_len); 5653 pos += ssid_len; 5654 5655 return skb; 5656 } 5657 EXPORT_SYMBOL(ieee80211_probereq_get); 5658 5659 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5660 const void *frame, size_t frame_len, 5661 const struct ieee80211_tx_info *frame_txctl, 5662 struct ieee80211_rts *rts) 5663 { 5664 const struct ieee80211_hdr *hdr = frame; 5665 5666 rts->frame_control = 5667 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5668 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5669 frame_txctl); 5670 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5671 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5672 } 5673 EXPORT_SYMBOL(ieee80211_rts_get); 5674 5675 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5676 const void *frame, size_t frame_len, 5677 const struct ieee80211_tx_info *frame_txctl, 5678 struct ieee80211_cts *cts) 5679 { 5680 const struct ieee80211_hdr *hdr = frame; 5681 5682 cts->frame_control = 5683 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5684 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5685 frame_len, frame_txctl); 5686 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5687 } 5688 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5689 5690 struct sk_buff * 5691 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5692 struct ieee80211_vif *vif) 5693 { 5694 struct ieee80211_local *local = hw_to_local(hw); 5695 struct sk_buff *skb = NULL; 5696 struct ieee80211_tx_data tx; 5697 struct ieee80211_sub_if_data *sdata; 5698 struct ps_data *ps; 5699 struct ieee80211_tx_info *info; 5700 struct ieee80211_chanctx_conf *chanctx_conf; 5701 5702 sdata = vif_to_sdata(vif); 5703 5704 rcu_read_lock(); 5705 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5706 5707 if (!chanctx_conf) 5708 goto out; 5709 5710 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5711 struct beacon_data *beacon = 5712 rcu_dereference(sdata->deflink.u.ap.beacon); 5713 5714 if (!beacon || !beacon->head) 5715 goto out; 5716 5717 ps = &sdata->u.ap.ps; 5718 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5719 ps = &sdata->u.mesh.ps; 5720 } else { 5721 goto out; 5722 } 5723 5724 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5725 goto out; /* send buffered bc/mc only after DTIM beacon */ 5726 5727 while (1) { 5728 skb = skb_dequeue(&ps->bc_buf); 5729 if (!skb) 5730 goto out; 5731 local->total_ps_buffered--; 5732 5733 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5734 struct ieee80211_hdr *hdr = 5735 (struct ieee80211_hdr *) skb->data; 5736 /* more buffered multicast/broadcast frames ==> set 5737 * MoreData flag in IEEE 802.11 header to inform PS 5738 * STAs */ 5739 hdr->frame_control |= 5740 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5741 } 5742 5743 if (sdata->vif.type == NL80211_IFTYPE_AP) 5744 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5745 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5746 break; 5747 ieee80211_free_txskb(hw, skb); 5748 } 5749 5750 info = IEEE80211_SKB_CB(skb); 5751 5752 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5753 info->band = chanctx_conf->def.chan->band; 5754 5755 if (invoke_tx_handlers(&tx)) 5756 skb = NULL; 5757 out: 5758 rcu_read_unlock(); 5759 5760 return skb; 5761 } 5762 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5763 5764 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5765 { 5766 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5767 struct ieee80211_sub_if_data *sdata = sta->sdata; 5768 struct ieee80211_local *local = sdata->local; 5769 int ret; 5770 u32 queues; 5771 5772 lockdep_assert_held(&local->sta_mtx); 5773 5774 /* only some cases are supported right now */ 5775 switch (sdata->vif.type) { 5776 case NL80211_IFTYPE_STATION: 5777 case NL80211_IFTYPE_AP: 5778 case NL80211_IFTYPE_AP_VLAN: 5779 break; 5780 default: 5781 WARN_ON(1); 5782 return -EINVAL; 5783 } 5784 5785 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5786 return -EINVAL; 5787 5788 if (sta->reserved_tid == tid) { 5789 ret = 0; 5790 goto out; 5791 } 5792 5793 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5794 sdata_err(sdata, "TID reservation already active\n"); 5795 ret = -EALREADY; 5796 goto out; 5797 } 5798 5799 ieee80211_stop_vif_queues(sdata->local, sdata, 5800 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5801 5802 synchronize_net(); 5803 5804 /* Tear down BA sessions so we stop aggregating on this TID */ 5805 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5806 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5807 __ieee80211_stop_tx_ba_session(sta, tid, 5808 AGG_STOP_LOCAL_REQUEST); 5809 } 5810 5811 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5812 __ieee80211_flush_queues(local, sdata, queues, false); 5813 5814 sta->reserved_tid = tid; 5815 5816 ieee80211_wake_vif_queues(local, sdata, 5817 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5818 5819 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5820 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5821 5822 ret = 0; 5823 out: 5824 return ret; 5825 } 5826 EXPORT_SYMBOL(ieee80211_reserve_tid); 5827 5828 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5829 { 5830 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5831 struct ieee80211_sub_if_data *sdata = sta->sdata; 5832 5833 lockdep_assert_held(&sdata->local->sta_mtx); 5834 5835 /* only some cases are supported right now */ 5836 switch (sdata->vif.type) { 5837 case NL80211_IFTYPE_STATION: 5838 case NL80211_IFTYPE_AP: 5839 case NL80211_IFTYPE_AP_VLAN: 5840 break; 5841 default: 5842 WARN_ON(1); 5843 return; 5844 } 5845 5846 if (tid != sta->reserved_tid) { 5847 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5848 return; 5849 } 5850 5851 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5852 } 5853 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5854 5855 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5856 struct sk_buff *skb, int tid, int link_id, 5857 enum nl80211_band band) 5858 { 5859 const struct ieee80211_hdr *hdr = (void *)skb->data; 5860 int ac = ieee80211_ac_from_tid(tid); 5861 unsigned int link; 5862 5863 skb_reset_mac_header(skb); 5864 skb_set_queue_mapping(skb, ac); 5865 skb->priority = tid; 5866 5867 skb->dev = sdata->dev; 5868 5869 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 5870 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 5871 IEEE80211_LINK_UNSPECIFIED)); 5872 5873 if (!sdata->vif.valid_links) { 5874 link = 0; 5875 } else if (link_id >= 0) { 5876 link = link_id; 5877 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 5878 /* address from the MLD */ 5879 link = IEEE80211_LINK_UNSPECIFIED; 5880 } else { 5881 /* otherwise must be addressed from a link */ 5882 rcu_read_lock(); 5883 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 5884 struct ieee80211_bss_conf *link_conf; 5885 5886 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 5887 if (!link_conf) 5888 continue; 5889 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 5890 break; 5891 } 5892 rcu_read_unlock(); 5893 5894 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 5895 link = ffs(sdata->vif.valid_links) - 1; 5896 } 5897 5898 IEEE80211_SKB_CB(skb)->control.flags |= 5899 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 5900 5901 /* 5902 * The other path calling ieee80211_xmit is from the tasklet, 5903 * and while we can handle concurrent transmissions locking 5904 * requirements are that we do not come into tx with bhs on. 5905 */ 5906 local_bh_disable(); 5907 IEEE80211_SKB_CB(skb)->band = band; 5908 ieee80211_xmit(sdata, NULL, skb); 5909 local_bh_enable(); 5910 } 5911 5912 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 5913 struct sk_buff *skb, int tid, int link_id) 5914 { 5915 struct ieee80211_chanctx_conf *chanctx_conf; 5916 enum nl80211_band band; 5917 5918 rcu_read_lock(); 5919 if (!sdata->vif.valid_links) { 5920 WARN_ON(link_id >= 0); 5921 chanctx_conf = 5922 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5923 if (WARN_ON(!chanctx_conf)) { 5924 rcu_read_unlock(); 5925 kfree_skb(skb); 5926 return; 5927 } 5928 band = chanctx_conf->def.chan->band; 5929 } else { 5930 WARN_ON(link_id >= 0 && 5931 !(sdata->vif.valid_links & BIT(link_id))); 5932 /* MLD transmissions must not rely on the band */ 5933 band = 0; 5934 } 5935 5936 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 5937 rcu_read_unlock(); 5938 } 5939 5940 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5941 const u8 *buf, size_t len, 5942 const u8 *dest, __be16 proto, bool unencrypted, 5943 int link_id, u64 *cookie) 5944 { 5945 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5946 struct ieee80211_local *local = sdata->local; 5947 struct sta_info *sta; 5948 struct sk_buff *skb; 5949 struct ethhdr *ehdr; 5950 u32 ctrl_flags = 0; 5951 u32 flags = 0; 5952 int err; 5953 5954 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5955 * or Pre-Authentication 5956 */ 5957 if (proto != sdata->control_port_protocol && 5958 proto != cpu_to_be16(ETH_P_PREAUTH)) 5959 return -EINVAL; 5960 5961 if (proto == sdata->control_port_protocol) 5962 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5963 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5964 5965 if (unencrypted) 5966 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5967 5968 if (cookie) 5969 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5970 5971 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5972 5973 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5974 sizeof(struct ethhdr) + len); 5975 if (!skb) 5976 return -ENOMEM; 5977 5978 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5979 5980 skb_put_data(skb, buf, len); 5981 5982 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5983 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5984 5985 /* we may override the SA for MLO STA later */ 5986 if (link_id < 0) { 5987 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 5988 IEEE80211_TX_CTRL_MLO_LINK); 5989 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5990 } else { 5991 struct ieee80211_bss_conf *link_conf; 5992 5993 ctrl_flags |= u32_encode_bits(link_id, 5994 IEEE80211_TX_CTRL_MLO_LINK); 5995 5996 rcu_read_lock(); 5997 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 5998 if (!link_conf) { 5999 dev_kfree_skb(skb); 6000 rcu_read_unlock(); 6001 return -ENOLINK; 6002 } 6003 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6004 rcu_read_unlock(); 6005 } 6006 6007 ehdr->h_proto = proto; 6008 6009 skb->dev = dev; 6010 skb->protocol = proto; 6011 skb_reset_network_header(skb); 6012 skb_reset_mac_header(skb); 6013 6014 if (local->hw.queues < IEEE80211_NUM_ACS) 6015 goto start_xmit; 6016 6017 /* update QoS header to prioritize control port frames if possible, 6018 * priorization also happens for control port frames send over 6019 * AF_PACKET 6020 */ 6021 rcu_read_lock(); 6022 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6023 if (err) { 6024 dev_kfree_skb(skb); 6025 rcu_read_unlock(); 6026 return err; 6027 } 6028 6029 if (!IS_ERR(sta)) { 6030 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6031 6032 skb_set_queue_mapping(skb, queue); 6033 6034 /* 6035 * for MLO STA, the SA should be the AP MLD address, but 6036 * the link ID has been selected already 6037 */ 6038 if (sta && sta->sta.mlo) 6039 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6040 } 6041 rcu_read_unlock(); 6042 6043 start_xmit: 6044 /* mutex lock is only needed for incrementing the cookie counter */ 6045 mutex_lock(&local->mtx); 6046 6047 local_bh_disable(); 6048 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6049 local_bh_enable(); 6050 6051 mutex_unlock(&local->mtx); 6052 6053 return 0; 6054 } 6055 6056 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6057 const u8 *buf, size_t len) 6058 { 6059 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6060 struct ieee80211_local *local = sdata->local; 6061 struct sk_buff *skb; 6062 6063 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6064 30 + /* header size */ 6065 18); /* 11s header size */ 6066 if (!skb) 6067 return -ENOMEM; 6068 6069 skb_reserve(skb, local->hw.extra_tx_headroom); 6070 skb_put_data(skb, buf, len); 6071 6072 skb->dev = dev; 6073 skb->protocol = htons(ETH_P_802_3); 6074 skb_reset_network_header(skb); 6075 skb_reset_mac_header(skb); 6076 6077 local_bh_disable(); 6078 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6079 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6080 NULL); 6081 local_bh_enable(); 6082 6083 return 0; 6084 } 6085