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 info->flags |= IEEE80211_TX_CTL_AMPDU; 1133 reset_agg_timer = true; 1134 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1135 /* 1136 * nothing -- this aggregation session is being started 1137 * but that might still fail with the driver 1138 */ 1139 } else if (!tx->sta->sta.txq[tid]) { 1140 spin_lock(&tx->sta->lock); 1141 /* 1142 * Need to re-check now, because we may get here 1143 * 1144 * 1) in the window during which the setup is actually 1145 * already done, but not marked yet because not all 1146 * packets are spliced over to the driver pending 1147 * queue yet -- if this happened we acquire the lock 1148 * either before or after the splice happens, but 1149 * need to recheck which of these cases happened. 1150 * 1151 * 2) during session teardown, if the OPERATIONAL bit 1152 * was cleared due to the teardown but the pointer 1153 * hasn't been assigned NULL yet (or we loaded it 1154 * before it was assigned) -- in this case it may 1155 * now be NULL which means we should just let the 1156 * packet pass through because splicing the frames 1157 * back is already done. 1158 */ 1159 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1160 1161 if (!tid_tx) { 1162 /* do nothing, let packet pass through */ 1163 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1164 info->flags |= IEEE80211_TX_CTL_AMPDU; 1165 reset_agg_timer = true; 1166 } else { 1167 queued = true; 1168 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1169 clear_sta_flag(tx->sta, WLAN_STA_SP); 1170 ps_dbg(tx->sta->sdata, 1171 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1172 tx->sta->sta.addr, tx->sta->sta.aid); 1173 } 1174 info->control.vif = &tx->sdata->vif; 1175 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1176 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1177 __skb_queue_tail(&tid_tx->pending, skb); 1178 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1179 purge_skb = __skb_dequeue(&tid_tx->pending); 1180 } 1181 spin_unlock(&tx->sta->lock); 1182 1183 if (purge_skb) 1184 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1185 } 1186 1187 /* reset session timer */ 1188 if (reset_agg_timer) 1189 tid_tx->last_tx = jiffies; 1190 1191 return queued; 1192 } 1193 1194 static void 1195 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1196 struct sta_info *sta, 1197 struct sk_buff *skb) 1198 { 1199 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1200 u16 tid; 1201 1202 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1203 return; 1204 1205 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1206 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1207 skb->protocol == sdata->control_port_protocol) 1208 return; 1209 1210 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1211 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1212 return; 1213 1214 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1215 } 1216 1217 /* 1218 * initialises @tx 1219 * pass %NULL for the station if unknown, a valid pointer if known 1220 * or an ERR_PTR() if the station is known not to exist 1221 */ 1222 static ieee80211_tx_result 1223 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1224 struct ieee80211_tx_data *tx, 1225 struct sta_info *sta, struct sk_buff *skb) 1226 { 1227 struct ieee80211_local *local = sdata->local; 1228 struct ieee80211_hdr *hdr; 1229 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1230 bool aggr_check = false; 1231 int tid; 1232 1233 memset(tx, 0, sizeof(*tx)); 1234 tx->skb = skb; 1235 tx->local = local; 1236 tx->sdata = sdata; 1237 __skb_queue_head_init(&tx->skbs); 1238 1239 /* 1240 * If this flag is set to true anywhere, and we get here, 1241 * we are doing the needed processing, so remove the flag 1242 * now. 1243 */ 1244 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1245 1246 hdr = (struct ieee80211_hdr *) skb->data; 1247 1248 if (likely(sta)) { 1249 if (!IS_ERR(sta)) 1250 tx->sta = sta; 1251 } else { 1252 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1253 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1254 if (!tx->sta && sdata->wdev.use_4addr) 1255 return TX_DROP; 1256 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1257 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1258 } 1259 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1260 tx->sta = sta_info_get(sdata, hdr->addr1); 1261 aggr_check = true; 1262 } 1263 } 1264 1265 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1266 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1267 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1268 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1269 struct tid_ampdu_tx *tid_tx; 1270 1271 tid = ieee80211_get_tid(hdr); 1272 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1273 if (!tid_tx && aggr_check) { 1274 ieee80211_aggr_check(sdata, tx->sta, skb); 1275 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1276 } 1277 1278 if (tid_tx) { 1279 bool queued; 1280 1281 queued = ieee80211_tx_prep_agg(tx, skb, info, 1282 tid_tx, tid); 1283 1284 if (unlikely(queued)) 1285 return TX_QUEUED; 1286 } 1287 } 1288 1289 if (is_multicast_ether_addr(hdr->addr1)) { 1290 tx->flags &= ~IEEE80211_TX_UNICAST; 1291 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1292 } else 1293 tx->flags |= IEEE80211_TX_UNICAST; 1294 1295 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1296 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1297 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1298 info->flags & IEEE80211_TX_CTL_AMPDU) 1299 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1300 } 1301 1302 if (!tx->sta) 1303 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1304 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1305 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1306 ieee80211_check_fast_xmit(tx->sta); 1307 } 1308 1309 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1310 1311 return TX_CONTINUE; 1312 } 1313 1314 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1315 struct ieee80211_vif *vif, 1316 struct sta_info *sta, 1317 struct sk_buff *skb) 1318 { 1319 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1321 struct ieee80211_txq *txq = NULL; 1322 1323 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1324 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1325 return NULL; 1326 1327 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1328 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1329 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1330 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1331 vif->type == NL80211_IFTYPE_STATION) && 1332 sta && sta->uploaded) { 1333 /* 1334 * This will be NULL if the driver didn't set the 1335 * opt-in hardware flag. 1336 */ 1337 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1338 } 1339 } else if (sta) { 1340 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1341 1342 if (!sta->uploaded) 1343 return NULL; 1344 1345 txq = sta->sta.txq[tid]; 1346 } else { 1347 txq = vif->txq; 1348 } 1349 1350 if (!txq) 1351 return NULL; 1352 1353 return to_txq_info(txq); 1354 } 1355 1356 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1357 { 1358 struct sk_buff *next; 1359 codel_time_t now = codel_get_time(); 1360 1361 skb_list_walk_safe(skb, skb, next) 1362 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1363 } 1364 1365 static u32 codel_skb_len_func(const struct sk_buff *skb) 1366 { 1367 return skb->len; 1368 } 1369 1370 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1371 { 1372 const struct ieee80211_tx_info *info; 1373 1374 info = (const struct ieee80211_tx_info *)skb->cb; 1375 return info->control.enqueue_time; 1376 } 1377 1378 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1379 void *ctx) 1380 { 1381 struct ieee80211_local *local; 1382 struct txq_info *txqi; 1383 struct fq *fq; 1384 struct fq_flow *flow; 1385 1386 txqi = ctx; 1387 local = vif_to_sdata(txqi->txq.vif)->local; 1388 fq = &local->fq; 1389 1390 if (cvars == &txqi->def_cvars) 1391 flow = &txqi->tin.default_flow; 1392 else 1393 flow = &fq->flows[cvars - local->cvars]; 1394 1395 return fq_flow_dequeue(fq, flow); 1396 } 1397 1398 static void codel_drop_func(struct sk_buff *skb, 1399 void *ctx) 1400 { 1401 struct ieee80211_local *local; 1402 struct ieee80211_hw *hw; 1403 struct txq_info *txqi; 1404 1405 txqi = ctx; 1406 local = vif_to_sdata(txqi->txq.vif)->local; 1407 hw = &local->hw; 1408 1409 ieee80211_free_txskb(hw, skb); 1410 } 1411 1412 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1413 struct fq_tin *tin, 1414 struct fq_flow *flow) 1415 { 1416 struct ieee80211_local *local; 1417 struct txq_info *txqi; 1418 struct codel_vars *cvars; 1419 struct codel_params *cparams; 1420 struct codel_stats *cstats; 1421 1422 local = container_of(fq, struct ieee80211_local, fq); 1423 txqi = container_of(tin, struct txq_info, tin); 1424 cstats = &txqi->cstats; 1425 1426 if (txqi->txq.sta) { 1427 struct sta_info *sta = container_of(txqi->txq.sta, 1428 struct sta_info, sta); 1429 cparams = &sta->cparams; 1430 } else { 1431 cparams = &local->cparams; 1432 } 1433 1434 if (flow == &tin->default_flow) 1435 cvars = &txqi->def_cvars; 1436 else 1437 cvars = &local->cvars[flow - fq->flows]; 1438 1439 return codel_dequeue(txqi, 1440 &flow->backlog, 1441 cparams, 1442 cvars, 1443 cstats, 1444 codel_skb_len_func, 1445 codel_skb_time_func, 1446 codel_drop_func, 1447 codel_dequeue_func); 1448 } 1449 1450 static void fq_skb_free_func(struct fq *fq, 1451 struct fq_tin *tin, 1452 struct fq_flow *flow, 1453 struct sk_buff *skb) 1454 { 1455 struct ieee80211_local *local; 1456 1457 local = container_of(fq, struct ieee80211_local, fq); 1458 ieee80211_free_txskb(&local->hw, skb); 1459 } 1460 1461 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1462 struct txq_info *txqi, 1463 struct sk_buff *skb) 1464 { 1465 struct fq *fq = &local->fq; 1466 struct fq_tin *tin = &txqi->tin; 1467 u32 flow_idx = fq_flow_idx(fq, skb); 1468 1469 ieee80211_set_skb_enqueue_time(skb); 1470 1471 spin_lock_bh(&fq->lock); 1472 /* 1473 * For management frames, don't really apply codel etc., 1474 * we don't want to apply any shaping or anything we just 1475 * want to simplify the driver API by having them on the 1476 * txqi. 1477 */ 1478 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1479 IEEE80211_SKB_CB(skb)->control.flags |= 1480 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1481 __skb_queue_tail(&txqi->frags, skb); 1482 } else { 1483 fq_tin_enqueue(fq, tin, flow_idx, skb, 1484 fq_skb_free_func); 1485 } 1486 spin_unlock_bh(&fq->lock); 1487 } 1488 1489 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1490 struct fq_flow *flow, struct sk_buff *skb, 1491 void *data) 1492 { 1493 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1494 1495 return info->control.vif == data; 1496 } 1497 1498 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1499 struct ieee80211_sub_if_data *sdata) 1500 { 1501 struct fq *fq = &local->fq; 1502 struct txq_info *txqi; 1503 struct fq_tin *tin; 1504 struct ieee80211_sub_if_data *ap; 1505 1506 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1507 return; 1508 1509 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1510 1511 if (!ap->vif.txq) 1512 return; 1513 1514 txqi = to_txq_info(ap->vif.txq); 1515 tin = &txqi->tin; 1516 1517 spin_lock_bh(&fq->lock); 1518 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1519 fq_skb_free_func); 1520 spin_unlock_bh(&fq->lock); 1521 } 1522 1523 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1524 struct sta_info *sta, 1525 struct txq_info *txqi, int tid) 1526 { 1527 fq_tin_init(&txqi->tin); 1528 codel_vars_init(&txqi->def_cvars); 1529 codel_stats_init(&txqi->cstats); 1530 __skb_queue_head_init(&txqi->frags); 1531 INIT_LIST_HEAD(&txqi->schedule_order); 1532 1533 txqi->txq.vif = &sdata->vif; 1534 1535 if (!sta) { 1536 sdata->vif.txq = &txqi->txq; 1537 txqi->txq.tid = 0; 1538 txqi->txq.ac = IEEE80211_AC_BE; 1539 1540 return; 1541 } 1542 1543 if (tid == IEEE80211_NUM_TIDS) { 1544 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1545 /* Drivers need to opt in to the management MPDU TXQ */ 1546 if (!ieee80211_hw_check(&sdata->local->hw, 1547 STA_MMPDU_TXQ)) 1548 return; 1549 } else if (!ieee80211_hw_check(&sdata->local->hw, 1550 BUFF_MMPDU_TXQ)) { 1551 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1552 return; 1553 } 1554 txqi->txq.ac = IEEE80211_AC_VO; 1555 } else { 1556 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1557 } 1558 1559 txqi->txq.sta = &sta->sta; 1560 txqi->txq.tid = tid; 1561 sta->sta.txq[tid] = &txqi->txq; 1562 } 1563 1564 void ieee80211_txq_purge(struct ieee80211_local *local, 1565 struct txq_info *txqi) 1566 { 1567 struct fq *fq = &local->fq; 1568 struct fq_tin *tin = &txqi->tin; 1569 1570 spin_lock_bh(&fq->lock); 1571 fq_tin_reset(fq, tin, fq_skb_free_func); 1572 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1573 spin_unlock_bh(&fq->lock); 1574 1575 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1576 list_del_init(&txqi->schedule_order); 1577 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1578 } 1579 1580 void ieee80211_txq_set_params(struct ieee80211_local *local) 1581 { 1582 if (local->hw.wiphy->txq_limit) 1583 local->fq.limit = local->hw.wiphy->txq_limit; 1584 else 1585 local->hw.wiphy->txq_limit = local->fq.limit; 1586 1587 if (local->hw.wiphy->txq_memory_limit) 1588 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1589 else 1590 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1591 1592 if (local->hw.wiphy->txq_quantum) 1593 local->fq.quantum = local->hw.wiphy->txq_quantum; 1594 else 1595 local->hw.wiphy->txq_quantum = local->fq.quantum; 1596 } 1597 1598 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1599 { 1600 struct fq *fq = &local->fq; 1601 int ret; 1602 int i; 1603 bool supp_vht = false; 1604 enum nl80211_band band; 1605 1606 ret = fq_init(fq, 4096); 1607 if (ret) 1608 return ret; 1609 1610 /* 1611 * If the hardware doesn't support VHT, it is safe to limit the maximum 1612 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1613 */ 1614 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1615 struct ieee80211_supported_band *sband; 1616 1617 sband = local->hw.wiphy->bands[band]; 1618 if (!sband) 1619 continue; 1620 1621 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1622 } 1623 1624 if (!supp_vht) 1625 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1626 1627 codel_params_init(&local->cparams); 1628 local->cparams.interval = MS2TIME(100); 1629 local->cparams.target = MS2TIME(20); 1630 local->cparams.ecn = true; 1631 1632 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1633 GFP_KERNEL); 1634 if (!local->cvars) { 1635 spin_lock_bh(&fq->lock); 1636 fq_reset(fq, fq_skb_free_func); 1637 spin_unlock_bh(&fq->lock); 1638 return -ENOMEM; 1639 } 1640 1641 for (i = 0; i < fq->flows_cnt; i++) 1642 codel_vars_init(&local->cvars[i]); 1643 1644 ieee80211_txq_set_params(local); 1645 1646 return 0; 1647 } 1648 1649 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1650 { 1651 struct fq *fq = &local->fq; 1652 1653 kfree(local->cvars); 1654 local->cvars = NULL; 1655 1656 spin_lock_bh(&fq->lock); 1657 fq_reset(fq, fq_skb_free_func); 1658 spin_unlock_bh(&fq->lock); 1659 } 1660 1661 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1662 struct ieee80211_sub_if_data *sdata, 1663 struct sta_info *sta, 1664 struct sk_buff *skb) 1665 { 1666 struct ieee80211_vif *vif; 1667 struct txq_info *txqi; 1668 1669 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1670 return false; 1671 1672 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1673 sdata = container_of(sdata->bss, 1674 struct ieee80211_sub_if_data, u.ap); 1675 1676 vif = &sdata->vif; 1677 txqi = ieee80211_get_txq(local, vif, sta, skb); 1678 1679 if (!txqi) 1680 return false; 1681 1682 ieee80211_txq_enqueue(local, txqi, skb); 1683 1684 schedule_and_wake_txq(local, txqi); 1685 1686 return true; 1687 } 1688 1689 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1690 struct ieee80211_vif *vif, 1691 struct sta_info *sta, 1692 struct sk_buff_head *skbs, 1693 bool txpending) 1694 { 1695 struct ieee80211_tx_control control = {}; 1696 struct sk_buff *skb, *tmp; 1697 unsigned long flags; 1698 1699 skb_queue_walk_safe(skbs, skb, tmp) { 1700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1701 int q = info->hw_queue; 1702 1703 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1704 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1705 __skb_unlink(skb, skbs); 1706 ieee80211_free_txskb(&local->hw, skb); 1707 continue; 1708 } 1709 #endif 1710 1711 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1712 if (local->queue_stop_reasons[q] || 1713 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1714 if (unlikely(info->flags & 1715 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1716 if (local->queue_stop_reasons[q] & 1717 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1718 /* 1719 * Drop off-channel frames if queues 1720 * are stopped for any reason other 1721 * than off-channel operation. Never 1722 * queue them. 1723 */ 1724 spin_unlock_irqrestore( 1725 &local->queue_stop_reason_lock, 1726 flags); 1727 ieee80211_purge_tx_queue(&local->hw, 1728 skbs); 1729 return true; 1730 } 1731 } else { 1732 1733 /* 1734 * Since queue is stopped, queue up frames for 1735 * later transmission from the tx-pending 1736 * tasklet when the queue is woken again. 1737 */ 1738 if (txpending) 1739 skb_queue_splice_init(skbs, 1740 &local->pending[q]); 1741 else 1742 skb_queue_splice_tail_init(skbs, 1743 &local->pending[q]); 1744 1745 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1746 flags); 1747 return false; 1748 } 1749 } 1750 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1751 1752 info->control.vif = vif; 1753 control.sta = sta ? &sta->sta : NULL; 1754 1755 __skb_unlink(skb, skbs); 1756 drv_tx(local, &control, skb); 1757 } 1758 1759 return true; 1760 } 1761 1762 /* 1763 * Returns false if the frame couldn't be transmitted but was queued instead. 1764 */ 1765 static bool __ieee80211_tx(struct ieee80211_local *local, 1766 struct sk_buff_head *skbs, struct sta_info *sta, 1767 bool txpending) 1768 { 1769 struct ieee80211_tx_info *info; 1770 struct ieee80211_sub_if_data *sdata; 1771 struct ieee80211_vif *vif; 1772 struct sk_buff *skb; 1773 bool result; 1774 1775 if (WARN_ON(skb_queue_empty(skbs))) 1776 return true; 1777 1778 skb = skb_peek(skbs); 1779 info = IEEE80211_SKB_CB(skb); 1780 sdata = vif_to_sdata(info->control.vif); 1781 if (sta && !sta->uploaded) 1782 sta = NULL; 1783 1784 switch (sdata->vif.type) { 1785 case NL80211_IFTYPE_MONITOR: 1786 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1787 vif = &sdata->vif; 1788 break; 1789 } 1790 sdata = rcu_dereference(local->monitor_sdata); 1791 if (sdata) { 1792 vif = &sdata->vif; 1793 info->hw_queue = 1794 vif->hw_queue[skb_get_queue_mapping(skb)]; 1795 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1796 ieee80211_purge_tx_queue(&local->hw, skbs); 1797 return true; 1798 } else 1799 vif = NULL; 1800 break; 1801 case NL80211_IFTYPE_AP_VLAN: 1802 sdata = container_of(sdata->bss, 1803 struct ieee80211_sub_if_data, u.ap); 1804 fallthrough; 1805 default: 1806 vif = &sdata->vif; 1807 break; 1808 } 1809 1810 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1811 1812 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1813 1814 return result; 1815 } 1816 1817 /* 1818 * Invoke TX handlers, return 0 on success and non-zero if the 1819 * frame was dropped or queued. 1820 * 1821 * The handlers are split into an early and late part. The latter is everything 1822 * that can be sensitive to reordering, and will be deferred to after packets 1823 * are dequeued from the intermediate queues (when they are enabled). 1824 */ 1825 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1826 { 1827 ieee80211_tx_result res = TX_DROP; 1828 1829 #define CALL_TXH(txh) \ 1830 do { \ 1831 res = txh(tx); \ 1832 if (res != TX_CONTINUE) \ 1833 goto txh_done; \ 1834 } while (0) 1835 1836 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1837 CALL_TXH(ieee80211_tx_h_check_assoc); 1838 CALL_TXH(ieee80211_tx_h_ps_buf); 1839 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1840 CALL_TXH(ieee80211_tx_h_select_key); 1841 1842 txh_done: 1843 if (unlikely(res == TX_DROP)) { 1844 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1845 if (tx->skb) 1846 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1847 else 1848 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1849 return -1; 1850 } else if (unlikely(res == TX_QUEUED)) { 1851 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1852 return -1; 1853 } 1854 1855 return 0; 1856 } 1857 1858 /* 1859 * Late handlers can be called while the sta lock is held. Handlers that can 1860 * cause packets to be generated will cause deadlock! 1861 */ 1862 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1863 { 1864 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1865 ieee80211_tx_result res = TX_CONTINUE; 1866 1867 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1868 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1869 1870 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1871 __skb_queue_tail(&tx->skbs, tx->skb); 1872 tx->skb = NULL; 1873 goto txh_done; 1874 } 1875 1876 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1877 CALL_TXH(ieee80211_tx_h_sequence); 1878 CALL_TXH(ieee80211_tx_h_fragment); 1879 /* handlers after fragment must be aware of tx info fragmentation! */ 1880 CALL_TXH(ieee80211_tx_h_stats); 1881 CALL_TXH(ieee80211_tx_h_encrypt); 1882 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1883 CALL_TXH(ieee80211_tx_h_calculate_duration); 1884 #undef CALL_TXH 1885 1886 txh_done: 1887 if (unlikely(res == TX_DROP)) { 1888 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1889 if (tx->skb) 1890 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1891 else 1892 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1893 return -1; 1894 } else if (unlikely(res == TX_QUEUED)) { 1895 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1896 return -1; 1897 } 1898 1899 return 0; 1900 } 1901 1902 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1903 { 1904 int r = invoke_tx_handlers_early(tx); 1905 1906 if (r) 1907 return r; 1908 return invoke_tx_handlers_late(tx); 1909 } 1910 1911 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1912 struct ieee80211_vif *vif, struct sk_buff *skb, 1913 int band, struct ieee80211_sta **sta) 1914 { 1915 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1916 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1917 struct ieee80211_tx_data tx; 1918 struct sk_buff *skb2; 1919 1920 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1921 return false; 1922 1923 info->band = band; 1924 info->control.vif = vif; 1925 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1926 1927 if (invoke_tx_handlers(&tx)) 1928 return false; 1929 1930 if (sta) { 1931 if (tx.sta) 1932 *sta = &tx.sta->sta; 1933 else 1934 *sta = NULL; 1935 } 1936 1937 /* this function isn't suitable for fragmented data frames */ 1938 skb2 = __skb_dequeue(&tx.skbs); 1939 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1940 ieee80211_free_txskb(hw, skb2); 1941 ieee80211_purge_tx_queue(hw, &tx.skbs); 1942 return false; 1943 } 1944 1945 return true; 1946 } 1947 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1948 1949 /* 1950 * Returns false if the frame couldn't be transmitted but was queued instead. 1951 */ 1952 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1953 struct sta_info *sta, struct sk_buff *skb, 1954 bool txpending) 1955 { 1956 struct ieee80211_local *local = sdata->local; 1957 struct ieee80211_tx_data tx; 1958 ieee80211_tx_result res_prepare; 1959 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1960 bool result = true; 1961 1962 if (unlikely(skb->len < 10)) { 1963 dev_kfree_skb(skb); 1964 return true; 1965 } 1966 1967 /* initialises tx */ 1968 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1969 1970 if (unlikely(res_prepare == TX_DROP)) { 1971 ieee80211_free_txskb(&local->hw, skb); 1972 return true; 1973 } else if (unlikely(res_prepare == TX_QUEUED)) { 1974 return true; 1975 } 1976 1977 /* set up hw_queue value early */ 1978 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1979 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1980 info->hw_queue = 1981 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1982 1983 if (invoke_tx_handlers_early(&tx)) 1984 return true; 1985 1986 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1987 return true; 1988 1989 if (!invoke_tx_handlers_late(&tx)) 1990 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1991 1992 return result; 1993 } 1994 1995 /* device xmit handlers */ 1996 1997 enum ieee80211_encrypt { 1998 ENCRYPT_NO, 1999 ENCRYPT_MGMT, 2000 ENCRYPT_DATA, 2001 }; 2002 2003 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 2004 struct sk_buff *skb, 2005 int head_need, 2006 enum ieee80211_encrypt encrypt) 2007 { 2008 struct ieee80211_local *local = sdata->local; 2009 bool enc_tailroom; 2010 int tail_need = 0; 2011 2012 enc_tailroom = encrypt == ENCRYPT_MGMT || 2013 (encrypt == ENCRYPT_DATA && 2014 sdata->crypto_tx_tailroom_needed_cnt); 2015 2016 if (enc_tailroom) { 2017 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2018 tail_need -= skb_tailroom(skb); 2019 tail_need = max_t(int, tail_need, 0); 2020 } 2021 2022 if (skb_cloned(skb) && 2023 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2024 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2025 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2026 else if (head_need || tail_need) 2027 I802_DEBUG_INC(local->tx_expand_skb_head); 2028 else 2029 return 0; 2030 2031 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2032 wiphy_debug(local->hw.wiphy, 2033 "failed to reallocate TX buffer\n"); 2034 return -ENOMEM; 2035 } 2036 2037 return 0; 2038 } 2039 2040 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2041 struct sta_info *sta, struct sk_buff *skb) 2042 { 2043 struct ieee80211_local *local = sdata->local; 2044 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2045 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2046 int headroom; 2047 enum ieee80211_encrypt encrypt; 2048 2049 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2050 encrypt = ENCRYPT_NO; 2051 else if (ieee80211_is_mgmt(hdr->frame_control)) 2052 encrypt = ENCRYPT_MGMT; 2053 else 2054 encrypt = ENCRYPT_DATA; 2055 2056 headroom = local->tx_headroom; 2057 if (encrypt != ENCRYPT_NO) 2058 headroom += IEEE80211_ENCRYPT_HEADROOM; 2059 headroom -= skb_headroom(skb); 2060 headroom = max_t(int, 0, headroom); 2061 2062 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2063 ieee80211_free_txskb(&local->hw, skb); 2064 return; 2065 } 2066 2067 /* reload after potential resize */ 2068 hdr = (struct ieee80211_hdr *) skb->data; 2069 info->control.vif = &sdata->vif; 2070 2071 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2072 if (ieee80211_is_data(hdr->frame_control) && 2073 is_unicast_ether_addr(hdr->addr1)) { 2074 if (mesh_nexthop_resolve(sdata, skb)) 2075 return; /* skb queued: don't free */ 2076 } else { 2077 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2078 } 2079 } 2080 2081 ieee80211_set_qos_hdr(sdata, skb); 2082 ieee80211_tx(sdata, sta, skb, false); 2083 } 2084 2085 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2086 { 2087 struct ieee80211_radiotap_header *rthdr = 2088 (struct ieee80211_radiotap_header *)skb->data; 2089 2090 /* check for not even having the fixed radiotap header part */ 2091 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2092 return false; /* too short to be possibly valid */ 2093 2094 /* is it a header version we can trust to find length from? */ 2095 if (unlikely(rthdr->it_version)) 2096 return false; /* only version 0 is supported */ 2097 2098 /* does the skb contain enough to deliver on the alleged length? */ 2099 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2100 return false; /* skb too short for claimed rt header extent */ 2101 2102 return true; 2103 } 2104 2105 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2106 struct net_device *dev) 2107 { 2108 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2109 struct ieee80211_radiotap_iterator iterator; 2110 struct ieee80211_radiotap_header *rthdr = 2111 (struct ieee80211_radiotap_header *) skb->data; 2112 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2113 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2114 NULL); 2115 u16 txflags; 2116 u16 rate = 0; 2117 bool rate_found = false; 2118 u8 rate_retries = 0; 2119 u16 rate_flags = 0; 2120 u8 mcs_known, mcs_flags, mcs_bw; 2121 u16 vht_known; 2122 u8 vht_mcs = 0, vht_nss = 0; 2123 int i; 2124 2125 if (!ieee80211_validate_radiotap_len(skb)) 2126 return false; 2127 2128 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2129 IEEE80211_TX_CTL_DONTFRAG; 2130 2131 /* 2132 * for every radiotap entry that is present 2133 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2134 * entries present, or -EINVAL on error) 2135 */ 2136 2137 while (!ret) { 2138 ret = ieee80211_radiotap_iterator_next(&iterator); 2139 2140 if (ret) 2141 continue; 2142 2143 /* see if this argument is something we can use */ 2144 switch (iterator.this_arg_index) { 2145 /* 2146 * You must take care when dereferencing iterator.this_arg 2147 * for multibyte types... the pointer is not aligned. Use 2148 * get_unaligned((type *)iterator.this_arg) to dereference 2149 * iterator.this_arg for type "type" safely on all arches. 2150 */ 2151 case IEEE80211_RADIOTAP_FLAGS: 2152 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2153 /* 2154 * this indicates that the skb we have been 2155 * handed has the 32-bit FCS CRC at the end... 2156 * we should react to that by snipping it off 2157 * because it will be recomputed and added 2158 * on transmission 2159 */ 2160 if (skb->len < (iterator._max_length + FCS_LEN)) 2161 return false; 2162 2163 skb_trim(skb, skb->len - FCS_LEN); 2164 } 2165 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2166 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2167 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2168 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2169 break; 2170 2171 case IEEE80211_RADIOTAP_TX_FLAGS: 2172 txflags = get_unaligned_le16(iterator.this_arg); 2173 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2174 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2175 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2176 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2177 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2178 info->control.flags |= 2179 IEEE80211_TX_CTRL_DONT_REORDER; 2180 break; 2181 2182 case IEEE80211_RADIOTAP_RATE: 2183 rate = *iterator.this_arg; 2184 rate_flags = 0; 2185 rate_found = true; 2186 break; 2187 2188 case IEEE80211_RADIOTAP_DATA_RETRIES: 2189 rate_retries = *iterator.this_arg; 2190 break; 2191 2192 case IEEE80211_RADIOTAP_MCS: 2193 mcs_known = iterator.this_arg[0]; 2194 mcs_flags = iterator.this_arg[1]; 2195 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2196 break; 2197 2198 rate_found = true; 2199 rate = iterator.this_arg[2]; 2200 rate_flags = IEEE80211_TX_RC_MCS; 2201 2202 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2203 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2204 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2205 2206 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2207 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2208 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2209 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2210 2211 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2212 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2213 info->flags |= IEEE80211_TX_CTL_LDPC; 2214 2215 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2216 u8 stbc = u8_get_bits(mcs_flags, 2217 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2218 2219 info->flags |= 2220 u32_encode_bits(stbc, 2221 IEEE80211_TX_CTL_STBC); 2222 } 2223 break; 2224 2225 case IEEE80211_RADIOTAP_VHT: 2226 vht_known = get_unaligned_le16(iterator.this_arg); 2227 rate_found = true; 2228 2229 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2230 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2231 (iterator.this_arg[2] & 2232 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2233 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2234 if (vht_known & 2235 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2236 if (iterator.this_arg[3] == 1) 2237 rate_flags |= 2238 IEEE80211_TX_RC_40_MHZ_WIDTH; 2239 else if (iterator.this_arg[3] == 4) 2240 rate_flags |= 2241 IEEE80211_TX_RC_80_MHZ_WIDTH; 2242 else if (iterator.this_arg[3] == 11) 2243 rate_flags |= 2244 IEEE80211_TX_RC_160_MHZ_WIDTH; 2245 } 2246 2247 vht_mcs = iterator.this_arg[4] >> 4; 2248 if (vht_mcs > 11) 2249 vht_mcs = 0; 2250 vht_nss = iterator.this_arg[4] & 0xF; 2251 if (!vht_nss || vht_nss > 8) 2252 vht_nss = 1; 2253 break; 2254 2255 /* 2256 * Please update the file 2257 * Documentation/networking/mac80211-injection.rst 2258 * when parsing new fields here. 2259 */ 2260 2261 default: 2262 break; 2263 } 2264 } 2265 2266 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2267 return false; 2268 2269 if (rate_found) { 2270 struct ieee80211_supported_band *sband = 2271 local->hw.wiphy->bands[info->band]; 2272 2273 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2274 2275 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2276 info->control.rates[i].idx = -1; 2277 info->control.rates[i].flags = 0; 2278 info->control.rates[i].count = 0; 2279 } 2280 2281 if (rate_flags & IEEE80211_TX_RC_MCS) { 2282 info->control.rates[0].idx = rate; 2283 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2284 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2285 vht_nss); 2286 } else if (sband) { 2287 for (i = 0; i < sband->n_bitrates; i++) { 2288 if (rate * 5 != sband->bitrates[i].bitrate) 2289 continue; 2290 2291 info->control.rates[0].idx = i; 2292 break; 2293 } 2294 } 2295 2296 if (info->control.rates[0].idx < 0) 2297 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2298 2299 info->control.rates[0].flags = rate_flags; 2300 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2301 local->hw.max_rate_tries); 2302 } 2303 2304 return true; 2305 } 2306 2307 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2308 struct net_device *dev) 2309 { 2310 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2311 struct ieee80211_chanctx_conf *chanctx_conf; 2312 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2313 struct ieee80211_hdr *hdr; 2314 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2315 struct cfg80211_chan_def *chandef; 2316 u16 len_rthdr; 2317 int hdrlen; 2318 2319 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2320 if (unlikely(!ieee80211_sdata_running(sdata))) 2321 goto fail; 2322 2323 memset(info, 0, sizeof(*info)); 2324 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2325 IEEE80211_TX_CTL_INJECTED; 2326 2327 /* Sanity-check the length of the radiotap header */ 2328 if (!ieee80211_validate_radiotap_len(skb)) 2329 goto fail; 2330 2331 /* we now know there is a radiotap header with a length we can use */ 2332 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2333 2334 /* 2335 * fix up the pointers accounting for the radiotap 2336 * header still being in there. We are being given 2337 * a precooked IEEE80211 header so no need for 2338 * normal processing 2339 */ 2340 skb_set_mac_header(skb, len_rthdr); 2341 /* 2342 * these are just fixed to the end of the rt area since we 2343 * don't have any better information and at this point, nobody cares 2344 */ 2345 skb_set_network_header(skb, len_rthdr); 2346 skb_set_transport_header(skb, len_rthdr); 2347 2348 if (skb->len < len_rthdr + 2) 2349 goto fail; 2350 2351 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2352 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2353 2354 if (skb->len < len_rthdr + hdrlen) 2355 goto fail; 2356 2357 /* 2358 * Initialize skb->protocol if the injected frame is a data frame 2359 * carrying a rfc1042 header 2360 */ 2361 if (ieee80211_is_data(hdr->frame_control) && 2362 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2363 u8 *payload = (u8 *)hdr + hdrlen; 2364 2365 if (ether_addr_equal(payload, rfc1042_header)) 2366 skb->protocol = cpu_to_be16((payload[6] << 8) | 2367 payload[7]); 2368 } 2369 2370 rcu_read_lock(); 2371 2372 /* 2373 * We process outgoing injected frames that have a local address 2374 * we handle as though they are non-injected frames. 2375 * This code here isn't entirely correct, the local MAC address 2376 * isn't always enough to find the interface to use; for proper 2377 * VLAN support we have an nl80211-based mechanism. 2378 * 2379 * This is necessary, for example, for old hostapd versions that 2380 * don't use nl80211-based management TX/RX. 2381 */ 2382 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2383 if (!ieee80211_sdata_running(tmp_sdata)) 2384 continue; 2385 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2386 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2387 continue; 2388 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2389 sdata = tmp_sdata; 2390 break; 2391 } 2392 } 2393 2394 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2395 if (!chanctx_conf) { 2396 tmp_sdata = rcu_dereference(local->monitor_sdata); 2397 if (tmp_sdata) 2398 chanctx_conf = 2399 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2400 } 2401 2402 if (chanctx_conf) 2403 chandef = &chanctx_conf->def; 2404 else if (!local->use_chanctx) 2405 chandef = &local->_oper_chandef; 2406 else 2407 goto fail_rcu; 2408 2409 /* 2410 * Frame injection is not allowed if beaconing is not allowed 2411 * or if we need radar detection. Beaconing is usually not allowed when 2412 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2413 * Passive scan is also used in world regulatory domains where 2414 * your country is not known and as such it should be treated as 2415 * NO TX unless the channel is explicitly allowed in which case 2416 * your current regulatory domain would not have the passive scan 2417 * flag. 2418 * 2419 * Since AP mode uses monitor interfaces to inject/TX management 2420 * frames we can make AP mode the exception to this rule once it 2421 * supports radar detection as its implementation can deal with 2422 * radar detection by itself. We can do that later by adding a 2423 * monitor flag interfaces used for AP support. 2424 */ 2425 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2426 sdata->vif.type)) 2427 goto fail_rcu; 2428 2429 info->band = chandef->chan->band; 2430 2431 /* Initialize skb->priority according to frame type and TID class, 2432 * with respect to the sub interface that the frame will actually 2433 * be transmitted on. If the DONT_REORDER flag is set, the original 2434 * skb-priority is preserved to assure frames injected with this 2435 * flag are not reordered relative to each other. 2436 */ 2437 ieee80211_select_queue_80211(sdata, skb, hdr); 2438 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2439 2440 /* 2441 * Process the radiotap header. This will now take into account the 2442 * selected chandef above to accurately set injection rates and 2443 * retransmissions. 2444 */ 2445 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2446 goto fail_rcu; 2447 2448 /* remove the injection radiotap header */ 2449 skb_pull(skb, len_rthdr); 2450 2451 ieee80211_xmit(sdata, NULL, skb); 2452 rcu_read_unlock(); 2453 2454 return NETDEV_TX_OK; 2455 2456 fail_rcu: 2457 rcu_read_unlock(); 2458 fail: 2459 dev_kfree_skb(skb); 2460 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2461 } 2462 2463 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2464 { 2465 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2466 2467 return ethertype == ETH_P_TDLS && 2468 skb->len > 14 && 2469 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2470 } 2471 2472 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2473 struct sk_buff *skb, 2474 struct sta_info **sta_out) 2475 { 2476 struct sta_info *sta; 2477 2478 switch (sdata->vif.type) { 2479 case NL80211_IFTYPE_AP_VLAN: 2480 sta = rcu_dereference(sdata->u.vlan.sta); 2481 if (sta) { 2482 *sta_out = sta; 2483 return 0; 2484 } else if (sdata->wdev.use_4addr) { 2485 return -ENOLINK; 2486 } 2487 fallthrough; 2488 case NL80211_IFTYPE_AP: 2489 case NL80211_IFTYPE_OCB: 2490 case NL80211_IFTYPE_ADHOC: 2491 if (is_multicast_ether_addr(skb->data)) { 2492 *sta_out = ERR_PTR(-ENOENT); 2493 return 0; 2494 } 2495 sta = sta_info_get_bss(sdata, skb->data); 2496 break; 2497 #ifdef CONFIG_MAC80211_MESH 2498 case NL80211_IFTYPE_MESH_POINT: 2499 /* determined much later */ 2500 *sta_out = NULL; 2501 return 0; 2502 #endif 2503 case NL80211_IFTYPE_STATION: 2504 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2505 sta = sta_info_get(sdata, skb->data); 2506 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2507 if (test_sta_flag(sta, 2508 WLAN_STA_TDLS_PEER_AUTH)) { 2509 *sta_out = sta; 2510 return 0; 2511 } 2512 2513 /* 2514 * TDLS link during setup - throw out frames to 2515 * peer. Allow TDLS-setup frames to unauthorized 2516 * peers for the special case of a link teardown 2517 * after a TDLS sta is removed due to being 2518 * unreachable. 2519 */ 2520 if (!ieee80211_is_tdls_setup(skb)) 2521 return -EINVAL; 2522 } 2523 2524 } 2525 2526 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2527 if (!sta) 2528 return -ENOLINK; 2529 break; 2530 default: 2531 return -EINVAL; 2532 } 2533 2534 *sta_out = sta ?: ERR_PTR(-ENOENT); 2535 return 0; 2536 } 2537 2538 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2539 struct sk_buff *skb, 2540 u32 *info_flags, 2541 u64 *cookie) 2542 { 2543 struct sk_buff *ack_skb; 2544 u16 info_id = 0; 2545 2546 if (skb->sk) 2547 ack_skb = skb_clone_sk(skb); 2548 else 2549 ack_skb = skb_clone(skb, GFP_ATOMIC); 2550 2551 if (ack_skb) { 2552 unsigned long flags; 2553 int id; 2554 2555 spin_lock_irqsave(&local->ack_status_lock, flags); 2556 id = idr_alloc(&local->ack_status_frames, ack_skb, 2557 1, 0x2000, GFP_ATOMIC); 2558 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2559 2560 if (id >= 0) { 2561 info_id = id; 2562 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2563 if (cookie) { 2564 *cookie = ieee80211_mgmt_tx_cookie(local); 2565 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2566 } 2567 } else { 2568 kfree_skb(ack_skb); 2569 } 2570 } 2571 2572 return info_id; 2573 } 2574 2575 /** 2576 * ieee80211_build_hdr - build 802.11 header in the given frame 2577 * @sdata: virtual interface to build the header for 2578 * @skb: the skb to build the header in 2579 * @info_flags: skb flags to set 2580 * @sta: the station pointer 2581 * @ctrl_flags: info control flags to set 2582 * @cookie: cookie pointer to fill (if not %NULL) 2583 * 2584 * This function takes the skb with 802.3 header and reformats the header to 2585 * the appropriate IEEE 802.11 header based on which interface the packet is 2586 * being transmitted on. 2587 * 2588 * Note that this function also takes care of the TX status request and 2589 * potential unsharing of the SKB - this needs to be interleaved with the 2590 * header building. 2591 * 2592 * The function requires the read-side RCU lock held 2593 * 2594 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2595 */ 2596 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2597 struct sk_buff *skb, u32 info_flags, 2598 struct sta_info *sta, u32 ctrl_flags, 2599 u64 *cookie) 2600 { 2601 struct ieee80211_local *local = sdata->local; 2602 struct ieee80211_tx_info *info; 2603 int head_need; 2604 u16 ethertype, hdrlen, meshhdrlen = 0; 2605 __le16 fc; 2606 struct ieee80211_hdr hdr; 2607 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2608 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2609 const u8 *encaps_data; 2610 int encaps_len, skip_header_bytes; 2611 bool wme_sta = false, authorized = false; 2612 bool tdls_peer; 2613 bool multicast; 2614 u16 info_id = 0; 2615 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2616 enum nl80211_band band; 2617 int ret; 2618 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2619 2620 if (IS_ERR(sta)) 2621 sta = NULL; 2622 2623 #ifdef CONFIG_MAC80211_DEBUGFS 2624 if (local->force_tx_status) 2625 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2626 #endif 2627 2628 /* convert Ethernet header to proper 802.11 header (based on 2629 * operation mode) */ 2630 ethertype = (skb->data[12] << 8) | skb->data[13]; 2631 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2632 2633 if (!sdata->vif.valid_links) 2634 chanctx_conf = 2635 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2636 2637 switch (sdata->vif.type) { 2638 case NL80211_IFTYPE_AP_VLAN: 2639 if (sdata->wdev.use_4addr) { 2640 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2641 /* RA TA DA SA */ 2642 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2643 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2644 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2645 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2646 hdrlen = 30; 2647 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2648 wme_sta = sta->sta.wme; 2649 } 2650 if (!sdata->vif.valid_links) { 2651 struct ieee80211_sub_if_data *ap_sdata; 2652 2653 /* override chanctx_conf from AP (we don't have one) */ 2654 ap_sdata = container_of(sdata->bss, 2655 struct ieee80211_sub_if_data, 2656 u.ap); 2657 chanctx_conf = 2658 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2659 } 2660 if (sdata->wdev.use_4addr) 2661 break; 2662 fallthrough; 2663 case NL80211_IFTYPE_AP: 2664 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2665 /* DA BSSID SA */ 2666 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2667 2668 if (sdata->vif.valid_links && sta && !sta->sta.mlo) { 2669 struct ieee80211_link_data *link; 2670 2671 link_id = sta->deflink.link_id; 2672 link = rcu_dereference(sdata->link[link_id]); 2673 if (WARN_ON(!link)) { 2674 ret = -ENOLINK; 2675 goto free; 2676 } 2677 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2678 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2679 (sta && sta->sta.mlo)) { 2680 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2681 } else { 2682 struct ieee80211_bss_conf *conf; 2683 2684 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2685 if (unlikely(!conf)) { 2686 ret = -ENOLINK; 2687 goto free; 2688 } 2689 2690 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2691 } 2692 2693 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2694 hdrlen = 24; 2695 break; 2696 #ifdef CONFIG_MAC80211_MESH 2697 case NL80211_IFTYPE_MESH_POINT: 2698 if (!is_multicast_ether_addr(skb->data)) { 2699 struct sta_info *next_hop; 2700 bool mpp_lookup = true; 2701 2702 mpath = mesh_path_lookup(sdata, skb->data); 2703 if (mpath) { 2704 mpp_lookup = false; 2705 next_hop = rcu_dereference(mpath->next_hop); 2706 if (!next_hop || 2707 !(mpath->flags & (MESH_PATH_ACTIVE | 2708 MESH_PATH_RESOLVING))) 2709 mpp_lookup = true; 2710 } 2711 2712 if (mpp_lookup) { 2713 mppath = mpp_path_lookup(sdata, skb->data); 2714 if (mppath) 2715 mppath->exp_time = jiffies; 2716 } 2717 2718 if (mppath && mpath) 2719 mesh_path_del(sdata, mpath->dst); 2720 } 2721 2722 /* 2723 * Use address extension if it is a packet from 2724 * another interface or if we know the destination 2725 * is being proxied by a portal (i.e. portal address 2726 * differs from proxied address) 2727 */ 2728 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2729 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2730 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2731 skb->data, skb->data + ETH_ALEN); 2732 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2733 NULL, NULL); 2734 } else { 2735 /* DS -> MBSS (802.11-2012 13.11.3.3). 2736 * For unicast with unknown forwarding information, 2737 * destination might be in the MBSS or if that fails 2738 * forwarded to another mesh gate. In either case 2739 * resolution will be handled in ieee80211_xmit(), so 2740 * leave the original DA. This also works for mcast */ 2741 const u8 *mesh_da = skb->data; 2742 2743 if (mppath) 2744 mesh_da = mppath->mpp; 2745 else if (mpath) 2746 mesh_da = mpath->dst; 2747 2748 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2749 mesh_da, sdata->vif.addr); 2750 if (is_multicast_ether_addr(mesh_da)) 2751 /* DA TA mSA AE:SA */ 2752 meshhdrlen = ieee80211_new_mesh_header( 2753 sdata, &mesh_hdr, 2754 skb->data + ETH_ALEN, NULL); 2755 else 2756 /* RA TA mDA mSA AE:DA SA */ 2757 meshhdrlen = ieee80211_new_mesh_header( 2758 sdata, &mesh_hdr, skb->data, 2759 skb->data + ETH_ALEN); 2760 2761 } 2762 2763 /* For injected frames, fill RA right away as nexthop lookup 2764 * will be skipped. 2765 */ 2766 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2767 is_zero_ether_addr(hdr.addr1)) 2768 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2769 break; 2770 #endif 2771 case NL80211_IFTYPE_STATION: 2772 /* we already did checks when looking up the RA STA */ 2773 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2774 2775 if (tdls_peer) { 2776 /* DA SA BSSID */ 2777 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2778 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2779 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2780 hdrlen = 24; 2781 } else if (sdata->u.mgd.use_4addr && 2782 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2783 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2784 IEEE80211_FCTL_TODS); 2785 /* RA TA DA SA */ 2786 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2787 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2788 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2789 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2790 hdrlen = 30; 2791 } else { 2792 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2793 /* BSSID SA DA */ 2794 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2795 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2796 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2797 hdrlen = 24; 2798 } 2799 break; 2800 case NL80211_IFTYPE_OCB: 2801 /* DA SA BSSID */ 2802 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2803 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2804 eth_broadcast_addr(hdr.addr3); 2805 hdrlen = 24; 2806 break; 2807 case NL80211_IFTYPE_ADHOC: 2808 /* DA SA BSSID */ 2809 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2810 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2811 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2812 hdrlen = 24; 2813 break; 2814 default: 2815 ret = -EINVAL; 2816 goto free; 2817 } 2818 2819 if (!chanctx_conf) { 2820 if (!sdata->vif.valid_links) { 2821 ret = -ENOTCONN; 2822 goto free; 2823 } 2824 /* MLD transmissions must not rely on the band */ 2825 band = 0; 2826 } else { 2827 band = chanctx_conf->def.chan->band; 2828 } 2829 2830 multicast = is_multicast_ether_addr(hdr.addr1); 2831 2832 /* sta is always NULL for mesh */ 2833 if (sta) { 2834 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2835 wme_sta = sta->sta.wme; 2836 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2837 /* For mesh, the use of the QoS header is mandatory */ 2838 wme_sta = true; 2839 } 2840 2841 /* receiver does QoS (which also means we do) use it */ 2842 if (wme_sta) { 2843 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2844 hdrlen += 2; 2845 } 2846 2847 /* 2848 * Drop unicast frames to unauthorised stations unless they are 2849 * EAPOL frames from the local station. 2850 */ 2851 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2852 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2853 !multicast && !authorized && 2854 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2855 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2856 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2857 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2858 sdata->name, hdr.addr1); 2859 #endif 2860 2861 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2862 2863 ret = -EPERM; 2864 goto free; 2865 } 2866 2867 if (unlikely(!multicast && ((skb->sk && 2868 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2869 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2870 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2871 cookie); 2872 2873 /* 2874 * If the skb is shared we need to obtain our own copy. 2875 */ 2876 skb = skb_share_check(skb, GFP_ATOMIC); 2877 if (unlikely(!skb)) { 2878 ret = -ENOMEM; 2879 goto free; 2880 } 2881 2882 hdr.frame_control = fc; 2883 hdr.duration_id = 0; 2884 hdr.seq_ctrl = 0; 2885 2886 skip_header_bytes = ETH_HLEN; 2887 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2888 encaps_data = bridge_tunnel_header; 2889 encaps_len = sizeof(bridge_tunnel_header); 2890 skip_header_bytes -= 2; 2891 } else if (ethertype >= ETH_P_802_3_MIN) { 2892 encaps_data = rfc1042_header; 2893 encaps_len = sizeof(rfc1042_header); 2894 skip_header_bytes -= 2; 2895 } else { 2896 encaps_data = NULL; 2897 encaps_len = 0; 2898 } 2899 2900 skb_pull(skb, skip_header_bytes); 2901 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2902 2903 /* 2904 * So we need to modify the skb header and hence need a copy of 2905 * that. The head_need variable above doesn't, so far, include 2906 * the needed header space that we don't need right away. If we 2907 * can, then we don't reallocate right now but only after the 2908 * frame arrives at the master device (if it does...) 2909 * 2910 * If we cannot, however, then we will reallocate to include all 2911 * the ever needed space. Also, if we need to reallocate it anyway, 2912 * make it big enough for everything we may ever need. 2913 */ 2914 2915 if (head_need > 0 || skb_cloned(skb)) { 2916 head_need += IEEE80211_ENCRYPT_HEADROOM; 2917 head_need += local->tx_headroom; 2918 head_need = max_t(int, 0, head_need); 2919 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2920 ieee80211_free_txskb(&local->hw, skb); 2921 skb = NULL; 2922 return ERR_PTR(-ENOMEM); 2923 } 2924 } 2925 2926 if (encaps_data) 2927 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2928 2929 #ifdef CONFIG_MAC80211_MESH 2930 if (meshhdrlen > 0) 2931 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2932 #endif 2933 2934 if (ieee80211_is_data_qos(fc)) { 2935 __le16 *qos_control; 2936 2937 qos_control = skb_push(skb, 2); 2938 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2939 /* 2940 * Maybe we could actually set some fields here, for now just 2941 * initialise to zero to indicate no special operation. 2942 */ 2943 *qos_control = 0; 2944 } else 2945 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2946 2947 skb_reset_mac_header(skb); 2948 2949 info = IEEE80211_SKB_CB(skb); 2950 memset(info, 0, sizeof(*info)); 2951 2952 info->flags = info_flags; 2953 info->ack_frame_id = info_id; 2954 info->band = band; 2955 2956 if (likely(!cookie)) { 2957 ctrl_flags |= u32_encode_bits(link_id, 2958 IEEE80211_TX_CTRL_MLO_LINK); 2959 } else { 2960 unsigned int pre_conf_link_id; 2961 2962 /* 2963 * ctrl_flags already have been set by 2964 * ieee80211_tx_control_port(), here 2965 * we just sanity check that 2966 */ 2967 2968 pre_conf_link_id = u32_get_bits(ctrl_flags, 2969 IEEE80211_TX_CTRL_MLO_LINK); 2970 2971 if (pre_conf_link_id != link_id && 2972 link_id != IEEE80211_LINK_UNSPECIFIED) { 2973 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2974 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2975 sdata->name, hdr.addr1, 2976 pre_conf_link_id, link_id); 2977 #endif 2978 ret = -EINVAL; 2979 goto free; 2980 } 2981 } 2982 2983 info->control.flags = ctrl_flags; 2984 2985 return skb; 2986 free: 2987 kfree_skb(skb); 2988 return ERR_PTR(ret); 2989 } 2990 2991 /* 2992 * fast-xmit overview 2993 * 2994 * The core idea of this fast-xmit is to remove per-packet checks by checking 2995 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2996 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2997 * much less work can be done per packet. For example, fragmentation must be 2998 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2999 * in the code here. 3000 * 3001 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3002 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3003 * 3004 * The most difficult part of this is that when any of these assumptions 3005 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3006 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3007 * since the per-packet code no longer checks the conditions. This is reflected 3008 * by the calls to these functions throughout the rest of the code, and must be 3009 * maintained if any of the TX path checks change. 3010 */ 3011 3012 void ieee80211_check_fast_xmit(struct sta_info *sta) 3013 { 3014 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3015 struct ieee80211_local *local = sta->local; 3016 struct ieee80211_sub_if_data *sdata = sta->sdata; 3017 struct ieee80211_hdr *hdr = (void *)build.hdr; 3018 struct ieee80211_chanctx_conf *chanctx_conf; 3019 __le16 fc; 3020 3021 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3022 return; 3023 3024 /* Locking here protects both the pointer itself, and against concurrent 3025 * invocations winning data access races to, e.g., the key pointer that 3026 * is used. 3027 * Without it, the invocation of this function right after the key 3028 * pointer changes wouldn't be sufficient, as another CPU could access 3029 * the pointer, then stall, and then do the cache update after the CPU 3030 * that invalidated the key. 3031 * With the locking, such scenarios cannot happen as the check for the 3032 * key and the fast-tx assignment are done atomically, so the CPU that 3033 * modifies the key will either wait or other one will see the key 3034 * cleared/changed already. 3035 */ 3036 spin_lock_bh(&sta->lock); 3037 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3038 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3039 sdata->vif.type == NL80211_IFTYPE_STATION) 3040 goto out; 3041 3042 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3043 goto out; 3044 3045 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3046 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3047 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3048 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3049 goto out; 3050 3051 if (sdata->noack_map) 3052 goto out; 3053 3054 /* fast-xmit doesn't handle fragmentation at all */ 3055 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3056 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3057 goto out; 3058 3059 if (!sdata->vif.valid_links) { 3060 rcu_read_lock(); 3061 chanctx_conf = 3062 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3063 if (!chanctx_conf) { 3064 rcu_read_unlock(); 3065 goto out; 3066 } 3067 build.band = chanctx_conf->def.chan->band; 3068 rcu_read_unlock(); 3069 } else { 3070 /* MLD transmissions must not rely on the band */ 3071 build.band = 0; 3072 } 3073 3074 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3075 3076 switch (sdata->vif.type) { 3077 case NL80211_IFTYPE_ADHOC: 3078 /* DA SA BSSID */ 3079 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3080 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3081 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3082 build.hdr_len = 24; 3083 break; 3084 case NL80211_IFTYPE_STATION: 3085 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3086 /* DA SA BSSID */ 3087 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3088 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3089 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3090 build.hdr_len = 24; 3091 break; 3092 } 3093 3094 if (sdata->u.mgd.use_4addr) { 3095 /* non-regular ethertype cannot use the fastpath */ 3096 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3097 IEEE80211_FCTL_TODS); 3098 /* RA TA DA SA */ 3099 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3100 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3101 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3102 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3103 build.hdr_len = 30; 3104 break; 3105 } 3106 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3107 /* BSSID SA DA */ 3108 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3109 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3110 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3111 build.hdr_len = 24; 3112 break; 3113 case NL80211_IFTYPE_AP_VLAN: 3114 if (sdata->wdev.use_4addr) { 3115 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3116 IEEE80211_FCTL_TODS); 3117 /* RA TA DA SA */ 3118 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3119 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3120 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3121 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3122 build.hdr_len = 30; 3123 break; 3124 } 3125 fallthrough; 3126 case NL80211_IFTYPE_AP: 3127 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3128 /* DA BSSID SA */ 3129 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3130 if (sta->sta.mlo || !sdata->vif.valid_links) { 3131 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3132 } else { 3133 unsigned int link_id = sta->deflink.link_id; 3134 struct ieee80211_link_data *link; 3135 3136 rcu_read_lock(); 3137 link = rcu_dereference(sdata->link[link_id]); 3138 if (WARN_ON(!link)) { 3139 rcu_read_unlock(); 3140 goto out; 3141 } 3142 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3143 rcu_read_unlock(); 3144 } 3145 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3146 build.hdr_len = 24; 3147 break; 3148 default: 3149 /* not handled on fast-xmit */ 3150 goto out; 3151 } 3152 3153 if (sta->sta.wme) { 3154 build.hdr_len += 2; 3155 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3156 } 3157 3158 /* We store the key here so there's no point in using rcu_dereference() 3159 * but that's fine because the code that changes the pointers will call 3160 * this function after doing so. For a single CPU that would be enough, 3161 * for multiple see the comment above. 3162 */ 3163 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3164 if (!build.key) 3165 build.key = rcu_access_pointer(sdata->default_unicast_key); 3166 if (build.key) { 3167 bool gen_iv, iv_spc, mmic; 3168 3169 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3170 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3171 mmic = build.key->conf.flags & 3172 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3173 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3174 3175 /* don't handle software crypto */ 3176 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3177 goto out; 3178 3179 /* Key is being removed */ 3180 if (build.key->flags & KEY_FLAG_TAINTED) 3181 goto out; 3182 3183 switch (build.key->conf.cipher) { 3184 case WLAN_CIPHER_SUITE_CCMP: 3185 case WLAN_CIPHER_SUITE_CCMP_256: 3186 if (gen_iv) 3187 build.pn_offs = build.hdr_len; 3188 if (gen_iv || iv_spc) 3189 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3190 break; 3191 case WLAN_CIPHER_SUITE_GCMP: 3192 case WLAN_CIPHER_SUITE_GCMP_256: 3193 if (gen_iv) 3194 build.pn_offs = build.hdr_len; 3195 if (gen_iv || iv_spc) 3196 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3197 break; 3198 case WLAN_CIPHER_SUITE_TKIP: 3199 /* cannot handle MMIC or IV generation in xmit-fast */ 3200 if (mmic || gen_iv) 3201 goto out; 3202 if (iv_spc) 3203 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3204 break; 3205 case WLAN_CIPHER_SUITE_WEP40: 3206 case WLAN_CIPHER_SUITE_WEP104: 3207 /* cannot handle IV generation in fast-xmit */ 3208 if (gen_iv) 3209 goto out; 3210 if (iv_spc) 3211 build.hdr_len += IEEE80211_WEP_IV_LEN; 3212 break; 3213 case WLAN_CIPHER_SUITE_AES_CMAC: 3214 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3215 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3216 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3217 WARN(1, 3218 "management cipher suite 0x%x enabled for data\n", 3219 build.key->conf.cipher); 3220 goto out; 3221 default: 3222 /* we don't know how to generate IVs for this at all */ 3223 if (WARN_ON(gen_iv)) 3224 goto out; 3225 } 3226 3227 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3228 } 3229 3230 hdr->frame_control = fc; 3231 3232 memcpy(build.hdr + build.hdr_len, 3233 rfc1042_header, sizeof(rfc1042_header)); 3234 build.hdr_len += sizeof(rfc1042_header); 3235 3236 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3237 /* if the kmemdup fails, continue w/o fast_tx */ 3238 3239 out: 3240 /* we might have raced against another call to this function */ 3241 old = rcu_dereference_protected(sta->fast_tx, 3242 lockdep_is_held(&sta->lock)); 3243 rcu_assign_pointer(sta->fast_tx, fast_tx); 3244 if (old) 3245 kfree_rcu(old, rcu_head); 3246 spin_unlock_bh(&sta->lock); 3247 } 3248 3249 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3250 { 3251 struct sta_info *sta; 3252 3253 rcu_read_lock(); 3254 list_for_each_entry_rcu(sta, &local->sta_list, list) 3255 ieee80211_check_fast_xmit(sta); 3256 rcu_read_unlock(); 3257 } 3258 3259 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3260 { 3261 struct ieee80211_local *local = sdata->local; 3262 struct sta_info *sta; 3263 3264 rcu_read_lock(); 3265 3266 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3267 if (sdata != sta->sdata && 3268 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3269 continue; 3270 ieee80211_check_fast_xmit(sta); 3271 } 3272 3273 rcu_read_unlock(); 3274 } 3275 3276 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3277 { 3278 struct ieee80211_fast_tx *fast_tx; 3279 3280 spin_lock_bh(&sta->lock); 3281 fast_tx = rcu_dereference_protected(sta->fast_tx, 3282 lockdep_is_held(&sta->lock)); 3283 RCU_INIT_POINTER(sta->fast_tx, NULL); 3284 spin_unlock_bh(&sta->lock); 3285 3286 if (fast_tx) 3287 kfree_rcu(fast_tx, rcu_head); 3288 } 3289 3290 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3291 struct sk_buff *skb, int headroom) 3292 { 3293 if (skb_headroom(skb) < headroom) { 3294 I802_DEBUG_INC(local->tx_expand_skb_head); 3295 3296 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3297 wiphy_debug(local->hw.wiphy, 3298 "failed to reallocate TX buffer\n"); 3299 return false; 3300 } 3301 } 3302 3303 return true; 3304 } 3305 3306 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3307 struct ieee80211_fast_tx *fast_tx, 3308 struct sk_buff *skb) 3309 { 3310 struct ieee80211_local *local = sdata->local; 3311 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3312 struct ieee80211_hdr *hdr; 3313 struct ethhdr *amsdu_hdr; 3314 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3315 int subframe_len = skb->len - hdr_len; 3316 void *data; 3317 u8 *qc, *h_80211_src, *h_80211_dst; 3318 const u8 *bssid; 3319 3320 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3321 return false; 3322 3323 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3324 return true; 3325 3326 if (!ieee80211_amsdu_realloc_pad(local, skb, 3327 sizeof(*amsdu_hdr) + 3328 local->hw.extra_tx_headroom)) 3329 return false; 3330 3331 data = skb_push(skb, sizeof(*amsdu_hdr)); 3332 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3333 hdr = data; 3334 amsdu_hdr = data + hdr_len; 3335 /* h_80211_src/dst is addr* field within hdr */ 3336 h_80211_src = data + fast_tx->sa_offs; 3337 h_80211_dst = data + fast_tx->da_offs; 3338 3339 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3340 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3341 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3342 3343 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3344 * fields needs to be changed to BSSID for A-MSDU frames depending 3345 * on FromDS/ToDS values. 3346 */ 3347 switch (sdata->vif.type) { 3348 case NL80211_IFTYPE_STATION: 3349 bssid = sdata->vif.cfg.ap_addr; 3350 break; 3351 case NL80211_IFTYPE_AP: 3352 case NL80211_IFTYPE_AP_VLAN: 3353 bssid = sdata->vif.addr; 3354 break; 3355 default: 3356 bssid = NULL; 3357 } 3358 3359 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3360 ether_addr_copy(h_80211_src, bssid); 3361 3362 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3363 ether_addr_copy(h_80211_dst, bssid); 3364 3365 qc = ieee80211_get_qos_ctl(hdr); 3366 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3367 3368 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3369 3370 return true; 3371 } 3372 3373 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3374 struct sta_info *sta, 3375 struct ieee80211_fast_tx *fast_tx, 3376 struct sk_buff *skb) 3377 { 3378 struct ieee80211_local *local = sdata->local; 3379 struct fq *fq = &local->fq; 3380 struct fq_tin *tin; 3381 struct fq_flow *flow; 3382 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3383 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3384 struct txq_info *txqi; 3385 struct sk_buff **frag_tail, *head; 3386 int subframe_len = skb->len - ETH_ALEN; 3387 u8 max_subframes = sta->sta.max_amsdu_subframes; 3388 int max_frags = local->hw.max_tx_fragments; 3389 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3390 int orig_truesize; 3391 u32 flow_idx; 3392 __be16 len; 3393 void *data; 3394 bool ret = false; 3395 unsigned int orig_len; 3396 int n = 2, nfrags, pad = 0; 3397 u16 hdrlen; 3398 3399 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3400 return false; 3401 3402 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3403 return false; 3404 3405 if (skb_is_gso(skb)) 3406 return false; 3407 3408 if (!txq) 3409 return false; 3410 3411 txqi = to_txq_info(txq); 3412 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3413 return false; 3414 3415 if (sta->sta.cur->max_rc_amsdu_len) 3416 max_amsdu_len = min_t(int, max_amsdu_len, 3417 sta->sta.cur->max_rc_amsdu_len); 3418 3419 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3420 max_amsdu_len = min_t(int, max_amsdu_len, 3421 sta->sta.cur->max_tid_amsdu_len[tid]); 3422 3423 flow_idx = fq_flow_idx(fq, skb); 3424 3425 spin_lock_bh(&fq->lock); 3426 3427 /* TODO: Ideally aggregation should be done on dequeue to remain 3428 * responsive to environment changes. 3429 */ 3430 3431 tin = &txqi->tin; 3432 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3433 head = skb_peek_tail(&flow->queue); 3434 if (!head || skb_is_gso(head)) 3435 goto out; 3436 3437 orig_truesize = head->truesize; 3438 orig_len = head->len; 3439 3440 if (skb->len + head->len > max_amsdu_len) 3441 goto out; 3442 3443 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3444 nfrags += 1 + skb_shinfo(head)->nr_frags; 3445 frag_tail = &skb_shinfo(head)->frag_list; 3446 while (*frag_tail) { 3447 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3448 frag_tail = &(*frag_tail)->next; 3449 n++; 3450 } 3451 3452 if (max_subframes && n > max_subframes) 3453 goto out; 3454 3455 if (max_frags && nfrags > max_frags) 3456 goto out; 3457 3458 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3459 goto out; 3460 3461 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3462 goto out; 3463 3464 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3465 * and frag_tail should be &skb_shinfo(head)->frag_list. 3466 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3467 * Reload frag_tail to have it pointing to the correct place. 3468 */ 3469 if (n == 2) 3470 frag_tail = &skb_shinfo(head)->frag_list; 3471 3472 /* 3473 * Pad out the previous subframe to a multiple of 4 by adding the 3474 * padding to the next one, that's being added. Note that head->len 3475 * is the length of the full A-MSDU, but that works since each time 3476 * we add a new subframe we pad out the previous one to a multiple 3477 * of 4 and thus it no longer matters in the next round. 3478 */ 3479 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3480 if ((head->len - hdrlen) & 3) 3481 pad = 4 - ((head->len - hdrlen) & 3); 3482 3483 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3484 2 + pad)) 3485 goto out_recalc; 3486 3487 ret = true; 3488 data = skb_push(skb, ETH_ALEN + 2); 3489 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3490 3491 data += 2 * ETH_ALEN; 3492 len = cpu_to_be16(subframe_len); 3493 memcpy(data, &len, 2); 3494 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3495 3496 memset(skb_push(skb, pad), 0, pad); 3497 3498 head->len += skb->len; 3499 head->data_len += skb->len; 3500 *frag_tail = skb; 3501 3502 out_recalc: 3503 fq->memory_usage += head->truesize - orig_truesize; 3504 if (head->len != orig_len) { 3505 flow->backlog += head->len - orig_len; 3506 tin->backlog_bytes += head->len - orig_len; 3507 } 3508 out: 3509 spin_unlock_bh(&fq->lock); 3510 3511 return ret; 3512 } 3513 3514 /* 3515 * Can be called while the sta lock is held. Anything that can cause packets to 3516 * be generated will cause deadlock! 3517 */ 3518 static ieee80211_tx_result 3519 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3520 struct sta_info *sta, u8 pn_offs, 3521 struct ieee80211_key *key, 3522 struct ieee80211_tx_data *tx) 3523 { 3524 struct sk_buff *skb = tx->skb; 3525 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3526 struct ieee80211_hdr *hdr = (void *)skb->data; 3527 u8 tid = IEEE80211_NUM_TIDS; 3528 3529 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3530 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3531 return TX_DROP; 3532 3533 if (key) 3534 info->control.hw_key = &key->conf; 3535 3536 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3537 3538 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3539 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3540 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3541 } else { 3542 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3543 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3544 sdata->sequence_number += 0x10; 3545 } 3546 3547 if (skb_shinfo(skb)->gso_size) 3548 sta->deflink.tx_stats.msdu[tid] += 3549 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3550 else 3551 sta->deflink.tx_stats.msdu[tid]++; 3552 3553 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3554 3555 /* statistics normally done by ieee80211_tx_h_stats (but that 3556 * has to consider fragmentation, so is more complex) 3557 */ 3558 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3559 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3560 3561 if (pn_offs) { 3562 u64 pn; 3563 u8 *crypto_hdr = skb->data + pn_offs; 3564 3565 switch (key->conf.cipher) { 3566 case WLAN_CIPHER_SUITE_CCMP: 3567 case WLAN_CIPHER_SUITE_CCMP_256: 3568 case WLAN_CIPHER_SUITE_GCMP: 3569 case WLAN_CIPHER_SUITE_GCMP_256: 3570 pn = atomic64_inc_return(&key->conf.tx_pn); 3571 crypto_hdr[0] = pn; 3572 crypto_hdr[1] = pn >> 8; 3573 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3574 crypto_hdr[4] = pn >> 16; 3575 crypto_hdr[5] = pn >> 24; 3576 crypto_hdr[6] = pn >> 32; 3577 crypto_hdr[7] = pn >> 40; 3578 break; 3579 } 3580 } 3581 3582 return TX_CONTINUE; 3583 } 3584 3585 static netdev_features_t 3586 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3587 { 3588 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3589 return sdata->vif.netdev_features; 3590 3591 if (!sdata->bss) 3592 return 0; 3593 3594 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3595 return sdata->vif.netdev_features; 3596 } 3597 3598 static struct sk_buff * 3599 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3600 { 3601 if (skb_is_gso(skb)) { 3602 struct sk_buff *segs; 3603 3604 segs = skb_gso_segment(skb, features); 3605 if (!segs) 3606 return skb; 3607 if (IS_ERR(segs)) 3608 goto free; 3609 3610 consume_skb(skb); 3611 return segs; 3612 } 3613 3614 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3615 goto free; 3616 3617 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3618 int ofs = skb_checksum_start_offset(skb); 3619 3620 if (skb->encapsulation) 3621 skb_set_inner_transport_header(skb, ofs); 3622 else 3623 skb_set_transport_header(skb, ofs); 3624 3625 if (skb_csum_hwoffload_help(skb, features)) 3626 goto free; 3627 } 3628 3629 skb_mark_not_on_list(skb); 3630 return skb; 3631 3632 free: 3633 kfree_skb(skb); 3634 return NULL; 3635 } 3636 3637 static void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3638 struct sta_info *sta, 3639 struct ieee80211_fast_tx *fast_tx, 3640 struct sk_buff *skb, u8 tid, bool ampdu) 3641 { 3642 struct ieee80211_local *local = sdata->local; 3643 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3644 struct ieee80211_tx_info *info; 3645 struct ieee80211_tx_data tx; 3646 ieee80211_tx_result r; 3647 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3648 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3649 struct ethhdr eth; 3650 3651 skb = skb_share_check(skb, GFP_ATOMIC); 3652 if (unlikely(!skb)) 3653 return; 3654 3655 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3656 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3657 return; 3658 3659 /* will not be crypto-handled beyond what we do here, so use false 3660 * as the may-encrypt argument for the resize to not account for 3661 * more room than we already have in 'extra_head' 3662 */ 3663 if (unlikely(ieee80211_skb_resize(sdata, skb, 3664 max_t(int, extra_head + hw_headroom - 3665 skb_headroom(skb), 0), 3666 ENCRYPT_NO))) 3667 goto free; 3668 3669 memcpy(ð, skb->data, ETH_HLEN - 2); 3670 hdr = skb_push(skb, extra_head); 3671 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3672 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3673 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3674 3675 info = IEEE80211_SKB_CB(skb); 3676 memset(info, 0, sizeof(*info)); 3677 info->band = fast_tx->band; 3678 info->control.vif = &sdata->vif; 3679 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3680 IEEE80211_TX_CTL_DONTFRAG | 3681 (ampdu ? IEEE80211_TX_CTL_AMPDU : 0); 3682 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3683 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3684 IEEE80211_TX_CTRL_MLO_LINK); 3685 3686 #ifdef CONFIG_MAC80211_DEBUGFS 3687 if (local->force_tx_status) 3688 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3689 #endif 3690 3691 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3692 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3693 *ieee80211_get_qos_ctl(hdr) = tid; 3694 } 3695 3696 __skb_queue_head_init(&tx.skbs); 3697 3698 tx.flags = IEEE80211_TX_UNICAST; 3699 tx.local = local; 3700 tx.sdata = sdata; 3701 tx.sta = sta; 3702 tx.key = fast_tx->key; 3703 3704 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3705 return; 3706 3707 tx.skb = skb; 3708 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3709 fast_tx->key, &tx); 3710 tx.skb = NULL; 3711 if (r == TX_DROP) 3712 goto free; 3713 3714 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3715 sdata = container_of(sdata->bss, 3716 struct ieee80211_sub_if_data, u.ap); 3717 3718 __skb_queue_tail(&tx.skbs, skb); 3719 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3720 return; 3721 3722 free: 3723 kfree_skb(skb); 3724 } 3725 3726 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3727 struct sta_info *sta, 3728 struct ieee80211_fast_tx *fast_tx, 3729 struct sk_buff *skb) 3730 { 3731 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3732 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3733 struct tid_ampdu_tx *tid_tx = NULL; 3734 struct sk_buff *next; 3735 u8 tid = IEEE80211_NUM_TIDS; 3736 3737 /* control port protocol needs a lot of special handling */ 3738 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3739 return false; 3740 3741 /* only RFC 1042 SNAP */ 3742 if (ethertype < ETH_P_802_3_MIN) 3743 return false; 3744 3745 /* don't handle TX status request here either */ 3746 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3747 return false; 3748 3749 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3750 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3751 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3752 if (tid_tx) { 3753 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3754 return false; 3755 if (tid_tx->timeout) 3756 tid_tx->last_tx = jiffies; 3757 } 3758 } 3759 3760 /* after this point (skb is modified) we cannot return false */ 3761 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3762 if (!skb) 3763 return true; 3764 3765 skb_list_walk_safe(skb, skb, next) { 3766 skb_mark_not_on_list(skb); 3767 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid, tid_tx); 3768 } 3769 3770 return true; 3771 } 3772 3773 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3774 struct ieee80211_txq *txq) 3775 { 3776 struct ieee80211_local *local = hw_to_local(hw); 3777 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3778 struct ieee80211_hdr *hdr; 3779 struct sk_buff *skb = NULL; 3780 struct fq *fq = &local->fq; 3781 struct fq_tin *tin = &txqi->tin; 3782 struct ieee80211_tx_info *info; 3783 struct ieee80211_tx_data tx; 3784 ieee80211_tx_result r; 3785 struct ieee80211_vif *vif = txq->vif; 3786 3787 WARN_ON_ONCE(softirq_count() == 0); 3788 3789 if (!ieee80211_txq_airtime_check(hw, txq)) 3790 return NULL; 3791 3792 begin: 3793 spin_lock_bh(&fq->lock); 3794 3795 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3796 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3797 goto out; 3798 3799 if (vif->txqs_stopped[txq->ac]) { 3800 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3801 goto out; 3802 } 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 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3814 } 3815 3816 if (!skb) 3817 goto out; 3818 3819 spin_unlock_bh(&fq->lock); 3820 3821 hdr = (struct ieee80211_hdr *)skb->data; 3822 info = IEEE80211_SKB_CB(skb); 3823 3824 memset(&tx, 0, sizeof(tx)); 3825 __skb_queue_head_init(&tx.skbs); 3826 tx.local = local; 3827 tx.skb = skb; 3828 tx.sdata = vif_to_sdata(info->control.vif); 3829 3830 if (txq->sta) { 3831 tx.sta = container_of(txq->sta, struct sta_info, sta); 3832 /* 3833 * Drop unicast frames to unauthorised stations unless they are 3834 * injected frames or EAPOL frames from the local station. 3835 */ 3836 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3837 ieee80211_is_data(hdr->frame_control) && 3838 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3839 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3840 !is_multicast_ether_addr(hdr->addr1) && 3841 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3842 (!(info->control.flags & 3843 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3844 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3845 NULL)))) { 3846 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3847 ieee80211_free_txskb(&local->hw, skb); 3848 goto begin; 3849 } 3850 } 3851 3852 /* 3853 * The key can be removed while the packet was queued, so need to call 3854 * this here to get the current key. 3855 */ 3856 r = ieee80211_tx_h_select_key(&tx); 3857 if (r != TX_CONTINUE) { 3858 ieee80211_free_txskb(&local->hw, skb); 3859 goto begin; 3860 } 3861 3862 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3863 info->flags |= IEEE80211_TX_CTL_AMPDU; 3864 else 3865 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3866 3867 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3868 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3869 r = ieee80211_tx_h_rate_ctrl(&tx); 3870 if (r != TX_CONTINUE) { 3871 ieee80211_free_txskb(&local->hw, skb); 3872 goto begin; 3873 } 3874 } 3875 goto encap_out; 3876 } 3877 3878 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3879 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3880 sta); 3881 u8 pn_offs = 0; 3882 3883 if (tx.key && 3884 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3885 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3886 3887 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3888 tx.key, &tx); 3889 if (r != TX_CONTINUE) { 3890 ieee80211_free_txskb(&local->hw, skb); 3891 goto begin; 3892 } 3893 } else { 3894 if (invoke_tx_handlers_late(&tx)) 3895 goto begin; 3896 3897 skb = __skb_dequeue(&tx.skbs); 3898 3899 if (!skb_queue_empty(&tx.skbs)) { 3900 spin_lock_bh(&fq->lock); 3901 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3902 spin_unlock_bh(&fq->lock); 3903 } 3904 } 3905 3906 if (skb_has_frag_list(skb) && 3907 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3908 if (skb_linearize(skb)) { 3909 ieee80211_free_txskb(&local->hw, skb); 3910 goto begin; 3911 } 3912 } 3913 3914 switch (tx.sdata->vif.type) { 3915 case NL80211_IFTYPE_MONITOR: 3916 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3917 vif = &tx.sdata->vif; 3918 break; 3919 } 3920 tx.sdata = rcu_dereference(local->monitor_sdata); 3921 if (tx.sdata) { 3922 vif = &tx.sdata->vif; 3923 info->hw_queue = 3924 vif->hw_queue[skb_get_queue_mapping(skb)]; 3925 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3926 ieee80211_free_txskb(&local->hw, skb); 3927 goto begin; 3928 } else { 3929 vif = NULL; 3930 } 3931 break; 3932 case NL80211_IFTYPE_AP_VLAN: 3933 tx.sdata = container_of(tx.sdata->bss, 3934 struct ieee80211_sub_if_data, u.ap); 3935 fallthrough; 3936 default: 3937 vif = &tx.sdata->vif; 3938 break; 3939 } 3940 3941 encap_out: 3942 IEEE80211_SKB_CB(skb)->control.vif = vif; 3943 3944 if (tx.sta && 3945 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3946 bool ampdu = txq->ac != IEEE80211_AC_VO; 3947 u32 airtime; 3948 3949 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3950 skb->len, ampdu); 3951 if (airtime) { 3952 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3953 ieee80211_sta_update_pending_airtime(local, tx.sta, 3954 txq->ac, 3955 airtime, 3956 false); 3957 } 3958 } 3959 3960 return skb; 3961 3962 out: 3963 spin_unlock_bh(&fq->lock); 3964 3965 return skb; 3966 } 3967 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3968 3969 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3970 { 3971 struct airtime_info *air_info = &sta->airtime[ac]; 3972 3973 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3974 } 3975 3976 static void 3977 ieee80211_txq_set_active(struct txq_info *txqi) 3978 { 3979 struct sta_info *sta; 3980 3981 if (!txqi->txq.sta) 3982 return; 3983 3984 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3985 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 3986 } 3987 3988 static bool 3989 ieee80211_txq_keep_active(struct txq_info *txqi) 3990 { 3991 struct sta_info *sta; 3992 u32 diff; 3993 3994 if (!txqi->txq.sta) 3995 return false; 3996 3997 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3998 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 3999 return false; 4000 4001 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 4002 4003 return diff <= AIRTIME_ACTIVE_DURATION; 4004 } 4005 4006 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4007 { 4008 struct ieee80211_local *local = hw_to_local(hw); 4009 struct ieee80211_txq *ret = NULL; 4010 struct txq_info *txqi = NULL, *head = NULL; 4011 bool found_eligible_txq = false; 4012 4013 spin_lock_bh(&local->active_txq_lock[ac]); 4014 4015 if (!local->schedule_round[ac]) 4016 goto out; 4017 4018 begin: 4019 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4020 struct txq_info, 4021 schedule_order); 4022 if (!txqi) 4023 goto out; 4024 4025 if (txqi == head) { 4026 if (!found_eligible_txq) 4027 goto out; 4028 else 4029 found_eligible_txq = false; 4030 } 4031 4032 if (!head) 4033 head = txqi; 4034 4035 if (txqi->txq.sta) { 4036 struct sta_info *sta = container_of(txqi->txq.sta, 4037 struct sta_info, sta); 4038 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4039 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4040 4041 if (aql_check) 4042 found_eligible_txq = true; 4043 4044 if (deficit < 0) 4045 sta->airtime[txqi->txq.ac].deficit += 4046 sta->airtime_weight; 4047 4048 if (deficit < 0 || !aql_check) { 4049 list_move_tail(&txqi->schedule_order, 4050 &local->active_txqs[txqi->txq.ac]); 4051 goto begin; 4052 } 4053 } 4054 4055 if (txqi->schedule_round == local->schedule_round[ac]) 4056 goto out; 4057 4058 list_del_init(&txqi->schedule_order); 4059 txqi->schedule_round = local->schedule_round[ac]; 4060 ret = &txqi->txq; 4061 4062 out: 4063 spin_unlock_bh(&local->active_txq_lock[ac]); 4064 return ret; 4065 } 4066 EXPORT_SYMBOL(ieee80211_next_txq); 4067 4068 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4069 struct ieee80211_txq *txq, 4070 bool force) 4071 { 4072 struct ieee80211_local *local = hw_to_local(hw); 4073 struct txq_info *txqi = to_txq_info(txq); 4074 bool has_queue; 4075 4076 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4077 4078 has_queue = force || txq_has_queue(txq); 4079 if (list_empty(&txqi->schedule_order) && 4080 (has_queue || ieee80211_txq_keep_active(txqi))) { 4081 /* If airtime accounting is active, always enqueue STAs at the 4082 * head of the list to ensure that they only get moved to the 4083 * back by the airtime DRR scheduler once they have a negative 4084 * deficit. A station that already has a negative deficit will 4085 * get immediately moved to the back of the list on the next 4086 * call to ieee80211_next_txq(). 4087 */ 4088 if (txqi->txq.sta && local->airtime_flags && has_queue && 4089 wiphy_ext_feature_isset(local->hw.wiphy, 4090 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4091 list_add(&txqi->schedule_order, 4092 &local->active_txqs[txq->ac]); 4093 else 4094 list_add_tail(&txqi->schedule_order, 4095 &local->active_txqs[txq->ac]); 4096 if (has_queue) 4097 ieee80211_txq_set_active(txqi); 4098 } 4099 4100 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4101 } 4102 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4103 4104 DEFINE_STATIC_KEY_FALSE(aql_disable); 4105 4106 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4107 struct ieee80211_txq *txq) 4108 { 4109 struct sta_info *sta; 4110 struct ieee80211_local *local = hw_to_local(hw); 4111 4112 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4113 return true; 4114 4115 if (static_branch_unlikely(&aql_disable)) 4116 return true; 4117 4118 if (!txq->sta) 4119 return true; 4120 4121 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4122 return true; 4123 4124 sta = container_of(txq->sta, struct sta_info, sta); 4125 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4126 sta->airtime[txq->ac].aql_limit_low) 4127 return true; 4128 4129 if (atomic_read(&local->aql_total_pending_airtime) < 4130 local->aql_threshold && 4131 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4132 sta->airtime[txq->ac].aql_limit_high) 4133 return true; 4134 4135 return false; 4136 } 4137 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4138 4139 static bool 4140 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4141 { 4142 unsigned int num_txq = 0; 4143 struct txq_info *txq; 4144 u32 aql_limit; 4145 4146 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4147 return true; 4148 4149 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4150 num_txq++; 4151 4152 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4153 local->aql_txq_limit_high[ac]; 4154 4155 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4156 } 4157 4158 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4159 struct ieee80211_txq *txq) 4160 { 4161 struct ieee80211_local *local = hw_to_local(hw); 4162 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4163 struct sta_info *sta; 4164 u8 ac = txq->ac; 4165 4166 spin_lock_bh(&local->active_txq_lock[ac]); 4167 4168 if (!txqi->txq.sta) 4169 goto out; 4170 4171 if (list_empty(&txqi->schedule_order)) 4172 goto out; 4173 4174 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4175 goto out; 4176 4177 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4178 schedule_order) { 4179 if (iter == txqi) 4180 break; 4181 4182 if (!iter->txq.sta) { 4183 list_move_tail(&iter->schedule_order, 4184 &local->active_txqs[ac]); 4185 continue; 4186 } 4187 sta = container_of(iter->txq.sta, struct sta_info, sta); 4188 if (ieee80211_sta_deficit(sta, ac) < 0) 4189 sta->airtime[ac].deficit += sta->airtime_weight; 4190 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4191 } 4192 4193 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4194 if (sta->airtime[ac].deficit >= 0) 4195 goto out; 4196 4197 sta->airtime[ac].deficit += sta->airtime_weight; 4198 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4199 spin_unlock_bh(&local->active_txq_lock[ac]); 4200 4201 return false; 4202 out: 4203 if (!list_empty(&txqi->schedule_order)) 4204 list_del_init(&txqi->schedule_order); 4205 spin_unlock_bh(&local->active_txq_lock[ac]); 4206 4207 return true; 4208 } 4209 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4210 4211 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4212 { 4213 struct ieee80211_local *local = hw_to_local(hw); 4214 4215 spin_lock_bh(&local->active_txq_lock[ac]); 4216 4217 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4218 local->schedule_round[ac]++; 4219 if (!local->schedule_round[ac]) 4220 local->schedule_round[ac]++; 4221 } else { 4222 local->schedule_round[ac] = 0; 4223 } 4224 4225 spin_unlock_bh(&local->active_txq_lock[ac]); 4226 } 4227 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4228 4229 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4230 struct net_device *dev, 4231 u32 info_flags, 4232 u32 ctrl_flags, 4233 u64 *cookie) 4234 { 4235 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4236 struct ieee80211_local *local = sdata->local; 4237 struct sta_info *sta; 4238 struct sk_buff *next; 4239 int len = skb->len; 4240 4241 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4242 kfree_skb(skb); 4243 return; 4244 } 4245 4246 rcu_read_lock(); 4247 4248 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4249 goto out_free; 4250 4251 if (IS_ERR(sta)) 4252 sta = NULL; 4253 4254 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4255 ieee80211_aggr_check(sdata, sta, skb); 4256 4257 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4258 4259 if (sta) { 4260 struct ieee80211_fast_tx *fast_tx; 4261 4262 fast_tx = rcu_dereference(sta->fast_tx); 4263 4264 if (fast_tx && 4265 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4266 goto out; 4267 } 4268 4269 /* the frame could be fragmented, software-encrypted, and other 4270 * things so we cannot really handle checksum or GSO offload. 4271 * fix it up in software before we handle anything else. 4272 */ 4273 skb = ieee80211_tx_skb_fixup(skb, 0); 4274 if (!skb) { 4275 len = 0; 4276 goto out; 4277 } 4278 4279 skb_list_walk_safe(skb, skb, next) { 4280 skb_mark_not_on_list(skb); 4281 4282 if (skb->protocol == sdata->control_port_protocol) 4283 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4284 4285 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4286 sta, ctrl_flags, cookie); 4287 if (IS_ERR(skb)) { 4288 kfree_skb_list(next); 4289 goto out; 4290 } 4291 4292 dev_sw_netstats_tx_add(dev, 1, skb->len); 4293 4294 ieee80211_xmit(sdata, sta, skb); 4295 } 4296 goto out; 4297 out_free: 4298 kfree_skb(skb); 4299 len = 0; 4300 out: 4301 if (len) 4302 ieee80211_tpt_led_trig_tx(local, len); 4303 rcu_read_unlock(); 4304 } 4305 4306 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4307 { 4308 struct ethhdr *eth; 4309 int err; 4310 4311 err = skb_ensure_writable(skb, ETH_HLEN); 4312 if (unlikely(err)) 4313 return err; 4314 4315 eth = (void *)skb->data; 4316 ether_addr_copy(eth->h_dest, sta->sta.addr); 4317 4318 return 0; 4319 } 4320 4321 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4322 struct net_device *dev) 4323 { 4324 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4325 const struct ethhdr *eth = (void *)skb->data; 4326 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4327 __be16 ethertype; 4328 4329 switch (sdata->vif.type) { 4330 case NL80211_IFTYPE_AP_VLAN: 4331 if (sdata->u.vlan.sta) 4332 return false; 4333 if (sdata->wdev.use_4addr) 4334 return false; 4335 fallthrough; 4336 case NL80211_IFTYPE_AP: 4337 /* check runtime toggle for this bss */ 4338 if (!sdata->bss->multicast_to_unicast) 4339 return false; 4340 break; 4341 default: 4342 return false; 4343 } 4344 4345 /* multicast to unicast conversion only for some payload */ 4346 ethertype = eth->h_proto; 4347 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4348 ethertype = ethvlan->h_vlan_encapsulated_proto; 4349 switch (ethertype) { 4350 case htons(ETH_P_ARP): 4351 case htons(ETH_P_IP): 4352 case htons(ETH_P_IPV6): 4353 break; 4354 default: 4355 return false; 4356 } 4357 4358 return true; 4359 } 4360 4361 static void 4362 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4363 struct sk_buff_head *queue) 4364 { 4365 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4366 struct ieee80211_local *local = sdata->local; 4367 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4368 struct sta_info *sta, *first = NULL; 4369 struct sk_buff *cloned_skb; 4370 4371 rcu_read_lock(); 4372 4373 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4374 if (sdata != sta->sdata) 4375 /* AP-VLAN mismatch */ 4376 continue; 4377 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4378 /* do not send back to source */ 4379 continue; 4380 if (!first) { 4381 first = sta; 4382 continue; 4383 } 4384 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4385 if (!cloned_skb) 4386 goto multicast; 4387 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4388 dev_kfree_skb(cloned_skb); 4389 goto multicast; 4390 } 4391 __skb_queue_tail(queue, cloned_skb); 4392 } 4393 4394 if (likely(first)) { 4395 if (unlikely(ieee80211_change_da(skb, first))) 4396 goto multicast; 4397 __skb_queue_tail(queue, skb); 4398 } else { 4399 /* no STA connected, drop */ 4400 kfree_skb(skb); 4401 skb = NULL; 4402 } 4403 4404 goto out; 4405 multicast: 4406 __skb_queue_purge(queue); 4407 __skb_queue_tail(queue, skb); 4408 out: 4409 rcu_read_unlock(); 4410 } 4411 4412 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4413 struct sk_buff *skb, u32 ctrl_flags, 4414 unsigned int link_id) 4415 { 4416 struct sk_buff *out; 4417 4418 out = skb_copy(skb, GFP_ATOMIC); 4419 if (!out) 4420 return; 4421 4422 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4423 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4424 } 4425 4426 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4427 struct sk_buff *skb) 4428 { 4429 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4430 unsigned long links = sdata->vif.valid_links; 4431 unsigned int link; 4432 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4433 4434 if (hweight16(links) == 1) { 4435 ctrl_flags |= u32_encode_bits(ffs(links) - 1, 4436 IEEE80211_TX_CTRL_MLO_LINK); 4437 4438 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4439 NULL); 4440 return; 4441 } 4442 4443 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4444 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4445 ctrl_flags = 0; 4446 } 4447 kfree_skb(skb); 4448 } 4449 4450 /** 4451 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4452 * @skb: packet to be sent 4453 * @dev: incoming interface 4454 * 4455 * On failure skb will be freed. 4456 */ 4457 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4458 struct net_device *dev) 4459 { 4460 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4461 const struct ethhdr *eth = (void *)skb->data; 4462 4463 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4464 goto normal; 4465 4466 if (unlikely(!ieee80211_sdata_running(sdata))) { 4467 kfree_skb(skb); 4468 return NETDEV_TX_OK; 4469 } 4470 4471 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4472 struct sk_buff_head queue; 4473 4474 __skb_queue_head_init(&queue); 4475 ieee80211_convert_to_unicast(skb, dev, &queue); 4476 while ((skb = __skb_dequeue(&queue))) 4477 __ieee80211_subif_start_xmit(skb, dev, 0, 4478 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4479 NULL); 4480 } else if (sdata->vif.valid_links && 4481 sdata->vif.type == NL80211_IFTYPE_AP && 4482 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4483 ieee80211_mlo_multicast_tx(dev, skb); 4484 } else { 4485 normal: 4486 __ieee80211_subif_start_xmit(skb, dev, 0, 4487 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4488 NULL); 4489 } 4490 4491 return NETDEV_TX_OK; 4492 } 4493 4494 4495 4496 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4497 struct sk_buff *skb, struct sta_info *sta, 4498 bool txpending) 4499 { 4500 struct ieee80211_local *local = sdata->local; 4501 struct ieee80211_tx_control control = {}; 4502 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4503 struct ieee80211_sta *pubsta = NULL; 4504 unsigned long flags; 4505 int q = info->hw_queue; 4506 4507 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4508 4509 if (local->queue_stop_reasons[q] || 4510 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4511 if (txpending) 4512 skb_queue_head(&local->pending[q], skb); 4513 else 4514 skb_queue_tail(&local->pending[q], skb); 4515 4516 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4517 4518 return false; 4519 } 4520 4521 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4522 4523 if (sta && sta->uploaded) 4524 pubsta = &sta->sta; 4525 4526 control.sta = pubsta; 4527 4528 drv_tx(local, &control, skb); 4529 4530 return true; 4531 } 4532 4533 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4534 struct sk_buff *skb, struct sta_info *sta, 4535 bool txpending) 4536 { 4537 struct ieee80211_local *local = sdata->local; 4538 struct sk_buff *next; 4539 bool ret = true; 4540 4541 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4542 return true; 4543 4544 skb_list_walk_safe(skb, skb, next) { 4545 skb_mark_not_on_list(skb); 4546 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4547 ret = false; 4548 } 4549 4550 return ret; 4551 } 4552 4553 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4554 struct net_device *dev, struct sta_info *sta, 4555 struct ieee80211_key *key, struct sk_buff *skb) 4556 { 4557 struct ieee80211_tx_info *info; 4558 struct ieee80211_local *local = sdata->local; 4559 struct tid_ampdu_tx *tid_tx; 4560 struct sk_buff *seg, *next; 4561 unsigned int skbs = 0, len = 0; 4562 u16 queue; 4563 u8 tid; 4564 4565 queue = ieee80211_select_queue(sdata, sta, skb); 4566 skb_set_queue_mapping(skb, queue); 4567 4568 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4569 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4570 goto out_free; 4571 4572 skb = skb_share_check(skb, GFP_ATOMIC); 4573 if (unlikely(!skb)) 4574 return; 4575 4576 ieee80211_aggr_check(sdata, sta, skb); 4577 4578 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4579 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4580 if (tid_tx) { 4581 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4582 /* fall back to non-offload slow path */ 4583 __ieee80211_subif_start_xmit(skb, dev, 0, 4584 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4585 NULL); 4586 return; 4587 } 4588 4589 if (tid_tx->timeout) 4590 tid_tx->last_tx = jiffies; 4591 } 4592 4593 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4594 if (!skb) 4595 return; 4596 4597 info = IEEE80211_SKB_CB(skb); 4598 memset(info, 0, sizeof(*info)); 4599 if (tid_tx) 4600 info->flags |= IEEE80211_TX_CTL_AMPDU; 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