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) 2018-2026 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 <linux/unaligned.h> 28 #include <net/fq_impl.h> 29 #include <net/sock.h> 30 #include <net/gso.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 44 struct sk_buff *skb, int group_addr, 45 int next_frag_len) 46 { 47 int rate, mrate, erp, dur, i; 48 struct ieee80211_rate *txrate; 49 struct ieee80211_local *local = tx->local; 50 struct ieee80211_supported_band *sband; 51 struct ieee80211_hdr *hdr; 52 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 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 /* uh huh? */ 59 if (WARN_ON_ONCE(tx->rate.idx < 0)) 60 return 0; 61 62 if (info->band >= NUM_NL80211_BANDS) 63 return 0; 64 65 sband = local->hw.wiphy->bands[info->band]; 66 txrate = &sband->bitrates[tx->rate.idx]; 67 68 erp = txrate->flags & IEEE80211_RATE_ERP_G; 69 70 /* device is expected to do this */ 71 if (sband->band == NL80211_BAND_S1GHZ) 72 return 0; 73 74 /* 75 * data and mgmt (except PS Poll): 76 * - during CFP: 32768 77 * - during contention period: 78 * if addr1 is group address: 0 79 * if more fragments = 0 and addr1 is individual address: time to 80 * transmit one ACK plus SIFS 81 * if more fragments = 1 and addr1 is individual address: time to 82 * transmit next fragment plus 2 x ACK plus 3 x SIFS 83 * 84 * IEEE 802.11, 9.6: 85 * - control response frame (CTS or ACK) shall be transmitted using the 86 * same rate as the immediately previous frame in the frame exchange 87 * sequence, if this rate belongs to the PHY mandatory rates, or else 88 * at the highest possible rate belonging to the PHY rates in the 89 * BSSBasicRateSet 90 */ 91 hdr = (struct ieee80211_hdr *)skb->data; 92 if (ieee80211_is_ctl(hdr->frame_control)) { 93 /* TODO: These control frames are not currently sent by 94 * mac80211, but should they be implemented, this function 95 * needs to be updated to support duration field calculation. 96 * 97 * RTS: time needed to transmit pending data/mgmt frame plus 98 * one CTS frame plus one ACK frame plus 3 x SIFS 99 * CTS: duration of immediately previous RTS minus time 100 * required to transmit CTS and its SIFS 101 * ACK: 0 if immediately previous directed data/mgmt had 102 * more=0, with more=1 duration in ACK frame is duration 103 * from previous frame minus time needed to transmit ACK 104 * and its SIFS 105 * PS Poll: BIT(15) | BIT(14) | aid 106 */ 107 return 0; 108 } 109 110 /* data/mgmt */ 111 if (0 /* FIX: data/mgmt during CFP */) 112 return cpu_to_le16(32768); 113 114 if (group_addr) /* Group address as the destination - no ACK */ 115 return 0; 116 117 /* Individual destination address: 118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 119 * CTS and ACK frames shall be transmitted using the highest rate in 120 * basic rate set that is less than or equal to the rate of the 121 * immediately previous frame and that is using the same modulation 122 * (CCK or OFDM). If no basic rate set matches with these requirements, 123 * the highest mandatory rate of the PHY that is less than or equal to 124 * the rate of the previous frame is used. 125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 126 */ 127 rate = -1; 128 /* use lowest available if everything fails */ 129 mrate = sband->bitrates[0].bitrate; 130 for (i = 0; i < sband->n_bitrates; i++) { 131 struct ieee80211_rate *r = &sband->bitrates[i]; 132 u32 flag; 133 134 if (r->bitrate > txrate->bitrate) 135 break; 136 137 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 138 rate = r->bitrate; 139 140 switch (sband->band) { 141 case NL80211_BAND_2GHZ: 142 case NL80211_BAND_LC: 143 if (tx->sdata->deflink.operating_11g_mode) 144 flag = IEEE80211_RATE_MANDATORY_G; 145 else 146 flag = IEEE80211_RATE_MANDATORY_B; 147 break; 148 case NL80211_BAND_5GHZ: 149 case NL80211_BAND_6GHZ: 150 flag = IEEE80211_RATE_MANDATORY_A; 151 break; 152 default: 153 flag = 0; 154 WARN_ON(1); 155 break; 156 } 157 158 if (r->flags & flag) 159 mrate = r->bitrate; 160 } 161 if (rate == -1) { 162 /* No matching basic rate found; use highest suitable mandatory 163 * PHY rate */ 164 rate = mrate; 165 } 166 167 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 168 if (ieee80211_is_data_qos(hdr->frame_control) && 169 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 170 dur = 0; 171 else 172 /* Time needed to transmit ACK 173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 174 * to closest integer */ 175 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 176 tx->sdata->vif.bss_conf.use_short_preamble); 177 178 if (next_frag_len) { 179 /* Frame is fragmented: duration increases with time needed to 180 * transmit next fragment plus ACK and 2 x SIFS. */ 181 dur *= 2; /* ACK + SIFS */ 182 /* next fragment */ 183 dur += ieee80211_frame_duration(sband->band, next_frag_len, 184 txrate->bitrate, erp, 185 tx->sdata->vif.bss_conf.use_short_preamble); 186 } 187 188 return cpu_to_le16(dur); 189 } 190 191 /* tx handlers */ 192 static ieee80211_tx_result debug_noinline 193 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 194 { 195 struct ieee80211_local *local = tx->local; 196 struct ieee80211_if_managed *ifmgd; 197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 198 199 /* driver doesn't support power save */ 200 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 201 return TX_CONTINUE; 202 203 /* hardware does dynamic power save */ 204 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 205 return TX_CONTINUE; 206 207 /* dynamic power save disabled */ 208 if (local->hw.conf.dynamic_ps_timeout <= 0) 209 return TX_CONTINUE; 210 211 /* we are scanning, don't enable power save */ 212 if (local->scanning) 213 return TX_CONTINUE; 214 215 if (!local->ps_sdata) 216 return TX_CONTINUE; 217 218 /* No point if we're going to suspend */ 219 if (local->quiescing) 220 return TX_CONTINUE; 221 222 /* dynamic ps is supported only in managed mode */ 223 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 224 return TX_CONTINUE; 225 226 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 227 return TX_CONTINUE; 228 229 ifmgd = &tx->sdata->u.mgd; 230 231 /* 232 * Don't wakeup from power save if u-apsd is enabled, voip ac has 233 * u-apsd enabled and the frame is in voip class. This effectively 234 * means that even if all access categories have u-apsd enabled, in 235 * practise u-apsd is only used with the voip ac. This is a 236 * workaround for the case when received voip class packets do not 237 * have correct qos tag for some reason, due the network or the 238 * peer application. 239 * 240 * Note: ifmgd->uapsd_queues access is racy here. If the value is 241 * changed via debugfs, user needs to reassociate manually to have 242 * everything in sync. 243 */ 244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 247 return TX_CONTINUE; 248 249 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 250 ieee80211_stop_queues_by_reason(&local->hw, 251 IEEE80211_MAX_QUEUE_MAP, 252 IEEE80211_QUEUE_STOP_REASON_PS, 253 false); 254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 255 wiphy_work_queue(local->hw.wiphy, 256 &local->dynamic_ps_disable_work); 257 } 258 259 /* Don't restart the timer if we're not disassociated */ 260 if (!ifmgd->associated) 261 return TX_CONTINUE; 262 263 mod_timer(&local->dynamic_ps_timer, jiffies + 264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 265 266 return TX_CONTINUE; 267 } 268 269 static ieee80211_tx_result debug_noinline 270 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 271 { 272 273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 275 bool assoc = false; 276 277 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 278 return TX_CONTINUE; 279 280 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 281 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 282 !ieee80211_is_probe_req(hdr->frame_control) && 283 !ieee80211_is_any_nullfunc(hdr->frame_control)) 284 /* 285 * When software scanning only nullfunc frames (to notify 286 * the sleep state to the AP) and probe requests (for the 287 * active scan) are allowed, all other frames should not be 288 * sent and we should not get here, but if we do 289 * nonetheless, drop them to avoid sending them 290 * off-channel. See __ieee80211_start_scan() for more. 291 */ 292 return TX_DROP; 293 294 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 295 return TX_CONTINUE; 296 297 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 298 return TX_CONTINUE; 299 300 if (tx->sta) 301 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 302 303 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 304 if (unlikely(!assoc && 305 ieee80211_is_data(hdr->frame_control))) { 306 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 307 sdata_info(tx->sdata, 308 "dropped data frame to not associated station %pM\n", 309 hdr->addr1); 310 #endif 311 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 312 return TX_DROP; 313 } 314 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 315 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 316 /* 317 * No associated STAs - no need to send multicast 318 * frames. 319 */ 320 return TX_DROP; 321 } 322 323 return TX_CONTINUE; 324 } 325 326 /* This function is called whenever the AP is about to exceed the maximum limit 327 * of buffered frames for power saving STAs. This situation should not really 328 * happen often during normal operation, so dropping the oldest buffered packet 329 * from each queue should be OK to make some room for new frames. */ 330 static void purge_old_ps_buffers(struct ieee80211_local *local) 331 { 332 int total = 0, purged = 0; 333 struct sk_buff *skb; 334 struct ieee80211_sub_if_data *sdata; 335 struct sta_info *sta; 336 337 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 338 struct ps_data *ps; 339 340 if (sdata->vif.type == NL80211_IFTYPE_AP) 341 ps = &sdata->u.ap.ps; 342 else if (ieee80211_vif_is_mesh(&sdata->vif)) 343 ps = &sdata->u.mesh.ps; 344 else 345 continue; 346 347 skb = skb_dequeue(&ps->bc_buf); 348 if (skb) { 349 purged++; 350 ieee80211_free_txskb(&local->hw, skb); 351 } 352 total += skb_queue_len(&ps->bc_buf); 353 } 354 355 /* 356 * Drop one frame from each station from the lowest-priority 357 * AC that has frames at all. 358 */ 359 list_for_each_entry_rcu(sta, &local->sta_list, list) { 360 int ac; 361 362 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 363 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 364 total += skb_queue_len(&sta->ps_tx_buf[ac]); 365 if (skb) { 366 purged++; 367 ieee80211_free_txskb(&local->hw, skb); 368 break; 369 } 370 } 371 } 372 373 local->total_ps_buffered = total; 374 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 375 } 376 377 static ieee80211_tx_result 378 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 379 { 380 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 382 struct ps_data *ps; 383 384 /* 385 * broadcast/multicast frame 386 * 387 * If any of the associated/peer stations is in power save mode, 388 * the frame is buffered to be sent after DTIM beacon frame. 389 * This is done either by the hardware or us. 390 */ 391 392 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 393 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 394 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 395 if (!tx->sdata->bss) 396 return TX_CONTINUE; 397 398 ps = &tx->sdata->bss->ps; 399 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 400 ps = &tx->sdata->u.mesh.ps; 401 } else { 402 return TX_CONTINUE; 403 } 404 405 406 /* no buffering for ordered frames */ 407 if (ieee80211_has_order(hdr->frame_control)) 408 return TX_CONTINUE; 409 410 if (ieee80211_is_probe_req(hdr->frame_control)) 411 return TX_CONTINUE; 412 413 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 414 info->hw_queue = tx->sdata->vif.cab_queue; 415 416 /* no stations in PS mode and no buffered packets */ 417 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 418 return TX_CONTINUE; 419 420 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 421 422 /* device releases frame after DTIM beacon */ 423 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 424 return TX_CONTINUE; 425 426 /* buffered in mac80211 */ 427 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 428 purge_old_ps_buffers(tx->local); 429 430 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 431 ps_dbg(tx->sdata, 432 "BC TX buffer full - dropping the oldest frame\n"); 433 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 434 } else 435 tx->local->total_ps_buffered++; 436 437 skb_queue_tail(&ps->bc_buf, tx->skb); 438 439 return TX_QUEUED; 440 } 441 442 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 443 struct sk_buff *skb) 444 { 445 if (!ieee80211_is_mgmt(fc)) 446 return 0; 447 448 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 449 return 0; 450 451 if (!ieee80211_is_robust_mgmt_frame(skb)) 452 return 0; 453 454 return 1; 455 } 456 457 static ieee80211_tx_result 458 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 459 { 460 struct sta_info *sta = tx->sta; 461 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 463 struct ieee80211_local *local = tx->local; 464 465 if (unlikely(!sta)) 466 return TX_CONTINUE; 467 468 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 469 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 470 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 471 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 472 int ac = skb_get_queue_mapping(tx->skb); 473 474 if (ieee80211_is_mgmt(hdr->frame_control) && 475 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 476 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 477 return TX_CONTINUE; 478 } 479 480 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 481 sta->sta.addr, sta->sta.aid, ac); 482 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 483 purge_old_ps_buffers(tx->local); 484 485 /* sync with ieee80211_sta_ps_deliver_wakeup */ 486 spin_lock(&sta->ps_lock); 487 /* 488 * STA woke up the meantime and all the frames on ps_tx_buf have 489 * been queued to pending queue. No reordering can happen, go 490 * ahead and Tx the packet. 491 */ 492 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 493 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 494 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 495 spin_unlock(&sta->ps_lock); 496 return TX_CONTINUE; 497 } 498 499 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 500 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 501 ps_dbg(tx->sdata, 502 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 503 sta->sta.addr, ac); 504 ieee80211_free_txskb(&local->hw, old); 505 } else 506 tx->local->total_ps_buffered++; 507 508 info->control.jiffies = jiffies; 509 info->control.vif = &tx->sdata->vif; 510 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 511 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 512 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 513 spin_unlock(&sta->ps_lock); 514 515 if (!timer_pending(&local->sta_cleanup)) 516 mod_timer(&local->sta_cleanup, 517 round_jiffies(jiffies + 518 STA_INFO_CLEANUP_INTERVAL)); 519 520 /* 521 * We queued up some frames, so the TIM bit might 522 * need to be set, recalculate it. 523 */ 524 sta_info_recalc_tim(sta); 525 526 return TX_QUEUED; 527 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 528 ps_dbg(tx->sdata, 529 "STA %pM in PS mode, but polling/in SP -> send frame\n", 530 sta->sta.addr); 531 } 532 533 return TX_CONTINUE; 534 } 535 536 static ieee80211_tx_result debug_noinline 537 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 538 { 539 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 540 return TX_CONTINUE; 541 542 if (tx->flags & IEEE80211_TX_UNICAST) 543 return ieee80211_tx_h_unicast_ps_buf(tx); 544 else 545 return ieee80211_tx_h_multicast_ps_buf(tx); 546 } 547 548 static ieee80211_tx_result debug_noinline 549 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 550 { 551 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 552 553 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 554 if (tx->sdata->control_port_no_encrypt) 555 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 556 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 557 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 558 } 559 560 return TX_CONTINUE; 561 } 562 563 static struct ieee80211_key * 564 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 565 { 566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 struct ieee80211_link_data *link; 569 unsigned int link_id; 570 571 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 572 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 573 link = &tx->sdata->deflink; 574 } else { 575 link = rcu_dereference(tx->sdata->link[link_id]); 576 if (!link) 577 return NULL; 578 } 579 580 if (ieee80211_is_group_privacy_action(tx->skb)) 581 return rcu_dereference(link->default_multicast_key); 582 else if (ieee80211_is_mgmt(hdr->frame_control) && 583 is_multicast_ether_addr(hdr->addr1) && 584 ieee80211_is_robust_mgmt_frame(tx->skb)) 585 return rcu_dereference(link->default_mgmt_key); 586 else if (is_multicast_ether_addr(hdr->addr1)) 587 return rcu_dereference(link->default_multicast_key); 588 589 return NULL; 590 } 591 592 static ieee80211_tx_result debug_noinline 593 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 594 { 595 struct ieee80211_key *key; 596 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 597 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 598 599 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 600 tx->key = NULL; 601 return TX_CONTINUE; 602 } 603 604 if (tx->sta && 605 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 606 tx->key = key; 607 else if ((key = ieee80211_select_link_key(tx))) 608 tx->key = key; 609 else if (!is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_unicast_key))) 611 tx->key = key; 612 else 613 tx->key = NULL; 614 615 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 616 if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 617 info->control.hw_key = &tx->key->conf; 618 return TX_CONTINUE; 619 } 620 621 if (tx->key) { 622 bool skip_hw = false; 623 624 /* TODO: add threshold stuff again */ 625 626 switch (tx->key->conf.cipher) { 627 case WLAN_CIPHER_SUITE_WEP40: 628 case WLAN_CIPHER_SUITE_WEP104: 629 case WLAN_CIPHER_SUITE_TKIP: 630 if (!ieee80211_is_data_present(hdr->frame_control)) 631 tx->key = NULL; 632 break; 633 case WLAN_CIPHER_SUITE_CCMP: 634 case WLAN_CIPHER_SUITE_CCMP_256: 635 case WLAN_CIPHER_SUITE_GCMP: 636 case WLAN_CIPHER_SUITE_GCMP_256: 637 if (!ieee80211_is_data_present(hdr->frame_control) && 638 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 639 tx->skb) && 640 !ieee80211_is_group_privacy_action(tx->skb) && 641 !ieee80211_require_encrypted_assoc(hdr->frame_control, 642 tx->sta)) 643 tx->key = NULL; 644 else 645 skip_hw = (tx->key->conf.flags & 646 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 647 ieee80211_is_mgmt(hdr->frame_control); 648 break; 649 case WLAN_CIPHER_SUITE_AES_CMAC: 650 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 651 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 652 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 653 if (!ieee80211_is_mgmt(hdr->frame_control)) 654 tx->key = NULL; 655 break; 656 } 657 658 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 659 !ieee80211_is_deauth(hdr->frame_control)) && 660 tx->skb->protocol != tx->sdata->control_port_protocol) 661 return TX_DROP; 662 663 if (!skip_hw && tx->key && 664 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 665 info->control.hw_key = &tx->key->conf; 666 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 667 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 668 return TX_DROP; 669 } 670 671 return TX_CONTINUE; 672 } 673 674 static ieee80211_tx_result debug_noinline 675 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 676 { 677 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 678 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 679 struct ieee80211_supported_band *sband; 680 u32 len; 681 struct ieee80211_tx_rate_control txrc; 682 struct ieee80211_sta_rates *ratetbl = NULL; 683 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 684 bool assoc = false; 685 686 memset(&txrc, 0, sizeof(txrc)); 687 688 if (info->band < NUM_NL80211_BANDS) 689 sband = tx->local->hw.wiphy->bands[info->band]; 690 else 691 return TX_CONTINUE; 692 693 len = min_t(u32, tx->skb->len + FCS_LEN, 694 tx->local->hw.wiphy->frag_threshold); 695 696 /* set up the tx rate control struct we give the RC algo */ 697 txrc.hw = &tx->local->hw; 698 txrc.sband = sband; 699 txrc.bss_conf = &tx->sdata->vif.bss_conf; 700 txrc.skb = tx->skb; 701 txrc.reported_rate.idx = -1; 702 703 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 704 txrc.rate_idx_mask = ~0; 705 } else { 706 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 707 708 if (tx->sdata->rc_has_mcs_mask[info->band]) 709 txrc.rate_idx_mcs_mask = 710 tx->sdata->rc_rateidx_mcs_mask[info->band]; 711 } 712 713 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 714 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 715 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 716 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 717 718 /* set up RTS protection if desired */ 719 if (len > tx->local->hw.wiphy->rts_threshold) { 720 txrc.rts = true; 721 } 722 723 info->control.use_rts = txrc.rts; 724 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 725 726 /* 727 * Use short preamble if the BSS can handle it, but not for 728 * management frames unless we know the receiver can handle 729 * that -- the management frame might be to a station that 730 * just wants a probe response. 731 */ 732 if (tx->sdata->vif.bss_conf.use_short_preamble && 733 (ieee80211_is_tx_data(tx->skb) || 734 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 735 txrc.short_preamble = true; 736 737 info->control.short_preamble = txrc.short_preamble; 738 739 /* don't ask rate control when rate already injected via radiotap */ 740 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 741 return TX_CONTINUE; 742 743 if (tx->sta) 744 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 745 746 /* 747 * Lets not bother rate control if we're associated and cannot talk to 748 * the sta. This should not happen - except for frames that aren't 749 * really for the peer to start with and already ignore rates. 750 */ 751 if (!(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK) && 752 WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 753 !rate_usable_index_exists(sband, &tx->sta->sta), 754 "%s: Dropped data frame as no usable bitrate found while " 755 "scanning and associated. Target station: " 756 "%pM on %d GHz band\n", 757 tx->sdata->name, 758 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 759 info->band ? 5 : 2)) 760 return TX_DROP; 761 762 /* 763 * If we're associated with the sta at this point we know we can at 764 * least send the frame at the lowest bit rate. 765 */ 766 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 767 768 if (tx->sta && !info->control.skip_table) 769 ratetbl = rcu_dereference(tx->sta->sta.rates); 770 771 if (unlikely(info->control.rates[0].idx < 0)) { 772 if (ratetbl) { 773 struct ieee80211_tx_rate rate = { 774 .idx = ratetbl->rate[0].idx, 775 .flags = ratetbl->rate[0].flags, 776 .count = ratetbl->rate[0].count 777 }; 778 779 if (ratetbl->rate[0].idx < 0) 780 return TX_DROP; 781 782 tx->rate = rate; 783 } else { 784 return TX_DROP; 785 } 786 } else { 787 tx->rate = info->control.rates[0]; 788 } 789 790 if (txrc.reported_rate.idx < 0) { 791 txrc.reported_rate = tx->rate; 792 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 793 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 794 } else if (tx->sta) 795 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 796 797 if (ratetbl) 798 return TX_CONTINUE; 799 800 if (unlikely(!info->control.rates[0].count)) 801 info->control.rates[0].count = 1; 802 803 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 804 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 805 info->control.rates[0].count = 1; 806 807 return TX_CONTINUE; 808 } 809 810 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 811 { 812 u16 *seq = &sta->tid_seq[tid]; 813 __le16 ret = cpu_to_le16(*seq); 814 815 /* Increase the sequence number. */ 816 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 817 818 return ret; 819 } 820 821 static ieee80211_tx_result debug_noinline 822 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 823 { 824 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 825 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 826 int tid; 827 828 /* 829 * Packet injection may want to control the sequence 830 * number, if we have no matching interface then we 831 * neither assign one ourselves nor ask the driver to. 832 */ 833 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 834 return TX_CONTINUE; 835 836 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 837 return TX_CONTINUE; 838 839 if (ieee80211_hdrlen(hdr->frame_control) < 24) 840 return TX_CONTINUE; 841 842 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 843 return TX_CONTINUE; 844 845 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 846 return TX_CONTINUE; 847 848 /* SNS11 from 802.11be 10.3.2.14 */ 849 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 850 ieee80211_vif_is_mld(info->control.vif) && 851 info->control.vif->type == NL80211_IFTYPE_AP)) { 852 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 853 tx->sdata->mld_mcast_seq += 0x10; 854 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 855 return TX_CONTINUE; 856 } 857 858 /* 859 * Anything but QoS data that has a sequence number field 860 * (is long enough) gets a sequence number from the global 861 * counter. QoS data frames with a multicast destination 862 * also use the global counter (802.11-2012 9.3.2.10). 863 */ 864 if (!ieee80211_is_data_qos(hdr->frame_control) || 865 is_multicast_ether_addr(hdr->addr1)) { 866 /* driver should assign sequence number */ 867 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 868 /* for pure STA mode without beacons, we can do it */ 869 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 870 tx->sdata->sequence_number += 0x10; 871 if (tx->sta) 872 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 873 return TX_CONTINUE; 874 } 875 876 /* 877 * This should be true for injected/management frames only, for 878 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 879 * above since they are not QoS-data frames. 880 */ 881 if (!tx->sta) 882 return TX_CONTINUE; 883 884 /* include per-STA, per-TID sequence counter */ 885 tid = ieee80211_get_tid(hdr); 886 tx->sta->deflink.tx_stats.msdu[tid]++; 887 888 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 889 890 return TX_CONTINUE; 891 } 892 893 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 894 struct sk_buff *skb, int hdrlen, 895 int frag_threshold) 896 { 897 struct ieee80211_local *local = tx->local; 898 struct ieee80211_tx_info *info; 899 struct sk_buff *tmp; 900 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 901 int pos = hdrlen + per_fragm; 902 int rem = skb->len - hdrlen - per_fragm; 903 904 if (WARN_ON(rem < 0)) 905 return -EINVAL; 906 907 /* first fragment was already added to queue by caller */ 908 909 while (rem) { 910 int fraglen = per_fragm; 911 912 if (fraglen > rem) 913 fraglen = rem; 914 rem -= fraglen; 915 tmp = dev_alloc_skb(local->tx_headroom + 916 frag_threshold + 917 IEEE80211_ENCRYPT_HEADROOM + 918 IEEE80211_ENCRYPT_TAILROOM); 919 if (!tmp) 920 return -ENOMEM; 921 922 __skb_queue_tail(&tx->skbs, tmp); 923 924 skb_reserve(tmp, 925 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 926 927 /* copy control information */ 928 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 929 930 info = IEEE80211_SKB_CB(tmp); 931 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 932 IEEE80211_TX_CTL_FIRST_FRAGMENT); 933 934 if (rem) 935 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 936 937 skb_copy_queue_mapping(tmp, skb); 938 tmp->priority = skb->priority; 939 tmp->dev = skb->dev; 940 941 /* copy header and data */ 942 skb_put_data(tmp, skb->data, hdrlen); 943 skb_put_data(tmp, skb->data + pos, fraglen); 944 945 pos += fraglen; 946 } 947 948 /* adjust first fragment's length */ 949 skb_trim(skb, hdrlen + per_fragm); 950 return 0; 951 } 952 953 static ieee80211_tx_result debug_noinline 954 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 955 { 956 struct sk_buff *skb = tx->skb; 957 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 958 struct ieee80211_hdr *hdr = (void *)skb->data; 959 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 960 int hdrlen; 961 int fragnum; 962 963 /* no matter what happens, tx->skb moves to tx->skbs */ 964 __skb_queue_tail(&tx->skbs, skb); 965 tx->skb = NULL; 966 967 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 968 return TX_CONTINUE; 969 970 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 971 return TX_CONTINUE; 972 973 /* 974 * Warn when submitting a fragmented A-MPDU frame and drop it. 975 * This scenario is handled in ieee80211_tx_prepare but extra 976 * caution taken here as fragmented ampdu may cause Tx stop. 977 */ 978 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 979 return TX_DROP; 980 981 hdrlen = ieee80211_hdrlen(hdr->frame_control); 982 983 /* internal error, why isn't DONTFRAG set? */ 984 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 985 return TX_DROP; 986 987 /* 988 * Now fragment the frame. This will allocate all the fragments and 989 * chain them (using skb as the first fragment) to skb->next. 990 * During transmission, we will remove the successfully transmitted 991 * fragments from this list. When the low-level driver rejects one 992 * of the fragments then we will simply pretend to accept the skb 993 * but store it away as pending. 994 */ 995 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 996 return TX_DROP; 997 998 /* update duration/seq/flags of fragments */ 999 fragnum = 0; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1003 1004 hdr = (void *)skb->data; 1005 info = IEEE80211_SKB_CB(skb); 1006 1007 if (!skb_queue_is_last(&tx->skbs, skb)) { 1008 hdr->frame_control |= morefrags; 1009 /* 1010 * No multi-rate retries for fragmented frames, that 1011 * would completely throw off the NAV at other STAs. 1012 */ 1013 info->control.rates[1].idx = -1; 1014 info->control.rates[2].idx = -1; 1015 info->control.rates[3].idx = -1; 1016 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1017 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1018 } else { 1019 hdr->frame_control &= ~morefrags; 1020 } 1021 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1022 fragnum++; 1023 } 1024 1025 return TX_CONTINUE; 1026 } 1027 1028 static ieee80211_tx_result debug_noinline 1029 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1030 { 1031 struct sk_buff *skb; 1032 int ac = -1; 1033 1034 if (!tx->sta) 1035 return TX_CONTINUE; 1036 1037 skb_queue_walk(&tx->skbs, skb) { 1038 ac = skb_get_queue_mapping(skb); 1039 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1040 } 1041 if (ac >= 0) 1042 tx->sta->deflink.tx_stats.packets[ac]++; 1043 1044 return TX_CONTINUE; 1045 } 1046 1047 static ieee80211_tx_result debug_noinline 1048 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1049 { 1050 if (!tx->key) 1051 return TX_CONTINUE; 1052 1053 switch (tx->key->conf.cipher) { 1054 case WLAN_CIPHER_SUITE_WEP40: 1055 case WLAN_CIPHER_SUITE_WEP104: 1056 return ieee80211_crypto_wep_encrypt(tx); 1057 case WLAN_CIPHER_SUITE_TKIP: 1058 return ieee80211_crypto_tkip_encrypt(tx); 1059 case WLAN_CIPHER_SUITE_CCMP: 1060 return ieee80211_crypto_ccmp_encrypt( 1061 tx, IEEE80211_CCMP_MIC_LEN); 1062 case WLAN_CIPHER_SUITE_CCMP_256: 1063 return ieee80211_crypto_ccmp_encrypt( 1064 tx, IEEE80211_CCMP_256_MIC_LEN); 1065 case WLAN_CIPHER_SUITE_AES_CMAC: 1066 return ieee80211_crypto_aes_cmac_encrypt( 1067 tx, IEEE80211_CMAC_128_MIC_LEN); 1068 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1069 return ieee80211_crypto_aes_cmac_encrypt( 1070 tx, IEEE80211_CMAC_256_MIC_LEN); 1071 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1072 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1073 return ieee80211_crypto_aes_gmac_encrypt(tx); 1074 case WLAN_CIPHER_SUITE_GCMP: 1075 case WLAN_CIPHER_SUITE_GCMP_256: 1076 return ieee80211_crypto_gcmp_encrypt(tx); 1077 } 1078 1079 return TX_DROP; 1080 } 1081 1082 static ieee80211_tx_result debug_noinline 1083 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1084 { 1085 struct sk_buff *skb; 1086 struct ieee80211_hdr *hdr; 1087 int next_len; 1088 bool group_addr; 1089 1090 skb_queue_walk(&tx->skbs, skb) { 1091 hdr = (void *) skb->data; 1092 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1093 break; /* must not overwrite AID */ 1094 if (!skb_queue_is_last(&tx->skbs, skb)) { 1095 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1096 next_len = next->len; 1097 } else 1098 next_len = 0; 1099 group_addr = is_multicast_ether_addr(hdr->addr1); 1100 1101 hdr->duration_id = 1102 ieee80211_duration(tx, skb, group_addr, next_len); 1103 } 1104 1105 return TX_CONTINUE; 1106 } 1107 1108 /* actual transmit path */ 1109 1110 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1111 struct sk_buff *skb, 1112 struct ieee80211_tx_info *info, 1113 struct tid_ampdu_tx *tid_tx, 1114 int tid) 1115 { 1116 bool queued = false; 1117 bool reset_agg_timer = false; 1118 struct sk_buff *purge_skb = NULL; 1119 1120 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1121 reset_agg_timer = true; 1122 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1123 /* 1124 * nothing -- this aggregation session is being started 1125 * but that might still fail with the driver 1126 */ 1127 } else if (!tx->sta->sta.txq[tid]) { 1128 spin_lock(&tx->sta->lock); 1129 /* 1130 * Need to re-check now, because we may get here 1131 * 1132 * 1) in the window during which the setup is actually 1133 * already done, but not marked yet because not all 1134 * packets are spliced over to the driver pending 1135 * queue yet -- if this happened we acquire the lock 1136 * either before or after the splice happens, but 1137 * need to recheck which of these cases happened. 1138 * 1139 * 2) during session teardown, if the OPERATIONAL bit 1140 * was cleared due to the teardown but the pointer 1141 * hasn't been assigned NULL yet (or we loaded it 1142 * before it was assigned) -- in this case it may 1143 * now be NULL which means we should just let the 1144 * packet pass through because splicing the frames 1145 * back is already done. 1146 */ 1147 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1148 1149 if (!tid_tx) { 1150 /* do nothing, let packet pass through */ 1151 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1152 reset_agg_timer = true; 1153 } else { 1154 queued = true; 1155 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1156 clear_sta_flag(tx->sta, WLAN_STA_SP); 1157 ps_dbg(tx->sta->sdata, 1158 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1159 tx->sta->sta.addr, tx->sta->sta.aid); 1160 } 1161 info->control.vif = &tx->sdata->vif; 1162 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1163 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1164 __skb_queue_tail(&tid_tx->pending, skb); 1165 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1166 purge_skb = __skb_dequeue(&tid_tx->pending); 1167 } 1168 spin_unlock(&tx->sta->lock); 1169 1170 if (purge_skb) 1171 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1172 } 1173 1174 /* reset session timer */ 1175 if (reset_agg_timer) 1176 tid_tx->last_tx = jiffies; 1177 1178 return queued; 1179 } 1180 1181 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1182 struct sta_info *sta, struct sk_buff *skb) 1183 { 1184 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1185 u16 tid; 1186 1187 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1188 return; 1189 1190 if (!sta || 1191 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1192 !sta->sta.deflink.s1g_cap.s1g) || 1193 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1194 skb->protocol == sdata->control_port_protocol) 1195 return; 1196 1197 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1198 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1199 return; 1200 1201 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1202 } 1203 1204 /* 1205 * initialises @tx 1206 * pass %NULL for the station if unknown, a valid pointer if known 1207 * or an ERR_PTR() if the station is known not to exist 1208 */ 1209 static ieee80211_tx_result 1210 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1211 struct ieee80211_tx_data *tx, 1212 struct sta_info *sta, struct sk_buff *skb) 1213 { 1214 struct ieee80211_local *local = sdata->local; 1215 struct ieee80211_hdr *hdr; 1216 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1217 bool aggr_check = false; 1218 int tid; 1219 1220 memset(tx, 0, sizeof(*tx)); 1221 tx->skb = skb; 1222 tx->local = local; 1223 tx->sdata = sdata; 1224 __skb_queue_head_init(&tx->skbs); 1225 1226 /* 1227 * If this flag is set to true anywhere, and we get here, 1228 * we are doing the needed processing, so remove the flag 1229 * now. 1230 */ 1231 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1232 1233 hdr = (struct ieee80211_hdr *) skb->data; 1234 1235 if (likely(sta)) { 1236 if (!IS_ERR(sta)) 1237 tx->sta = sta; 1238 } else { 1239 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1240 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1241 if (!tx->sta && sdata->wdev.use_4addr) 1242 return TX_DROP; 1243 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1244 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1245 } 1246 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1247 tx->sta = sta_info_get(sdata, hdr->addr1); 1248 aggr_check = true; 1249 } 1250 } 1251 1252 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1253 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1254 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1255 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1256 struct tid_ampdu_tx *tid_tx; 1257 1258 tid = ieee80211_get_tid(hdr); 1259 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1260 if (!tid_tx && aggr_check) { 1261 ieee80211_aggr_check(sdata, tx->sta, skb); 1262 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1263 } 1264 1265 if (tid_tx) { 1266 bool queued; 1267 1268 queued = ieee80211_tx_prep_agg(tx, skb, info, 1269 tid_tx, tid); 1270 1271 if (unlikely(queued)) 1272 return TX_QUEUED; 1273 } 1274 } 1275 1276 if (is_multicast_ether_addr(hdr->addr1)) { 1277 tx->flags &= ~IEEE80211_TX_UNICAST; 1278 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1279 } else 1280 tx->flags |= IEEE80211_TX_UNICAST; 1281 1282 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1283 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1284 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1285 info->flags & IEEE80211_TX_CTL_AMPDU) 1286 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1287 } 1288 1289 if (!tx->sta) 1290 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1291 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1292 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1293 ieee80211_check_fast_xmit(tx->sta); 1294 } 1295 1296 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1297 1298 return TX_CONTINUE; 1299 } 1300 1301 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1302 struct ieee80211_vif *vif, 1303 struct sta_info *sta, 1304 struct sk_buff *skb) 1305 { 1306 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1307 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1308 struct ieee80211_txq *txq = NULL; 1309 1310 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1311 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1312 return NULL; 1313 1314 /* 1315 * While (re)association request/response frames are not considered 1316 * bufferable MMPDUs, use the TXQ abstraction for the transmission of 1317 * these frames. This is specifically useful for drivers that might 1318 * associate other resources with the TXQ, e.g., encryption keys etc. 1319 */ 1320 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1321 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1322 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1323 ieee80211_is_bufferable_mmpdu(skb) || 1324 ieee80211_is_assoc(hdr->frame_control) || 1325 vif->type == NL80211_IFTYPE_STATION || 1326 vif->type == NL80211_IFTYPE_NAN || 1327 vif->type == NL80211_IFTYPE_NAN_DATA) && 1328 sta && sta->uploaded) { 1329 /* 1330 * This will be NULL if the driver didn't set the 1331 * opt-in hardware flag. 1332 */ 1333 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1334 } else if ((!ieee80211_is_mgmt(hdr->frame_control) || 1335 ieee80211_is_bufferable_mmpdu(skb)) && 1336 !sta) { 1337 txq = vif->txq_mgmt; 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 cparams = &local->cparams; 1425 cstats = &txqi->cstats; 1426 1427 if (flow == &tin->default_flow) 1428 cvars = &txqi->def_cvars; 1429 else 1430 cvars = &local->cvars[flow - fq->flows]; 1431 1432 return codel_dequeue(txqi, 1433 &flow->backlog, 1434 cparams, 1435 cvars, 1436 cstats, 1437 codel_skb_len_func, 1438 codel_skb_time_func, 1439 codel_drop_func, 1440 codel_dequeue_func); 1441 } 1442 1443 static void fq_skb_free_func(struct fq *fq, 1444 struct fq_tin *tin, 1445 struct fq_flow *flow, 1446 struct sk_buff *skb) 1447 { 1448 struct ieee80211_local *local; 1449 1450 local = container_of(fq, struct ieee80211_local, fq); 1451 ieee80211_free_txskb(&local->hw, skb); 1452 } 1453 1454 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1455 struct txq_info *txqi, 1456 struct sk_buff *skb) 1457 { 1458 struct fq *fq = &local->fq; 1459 struct fq_tin *tin = &txqi->tin; 1460 u32 flow_idx; 1461 1462 ieee80211_set_skb_enqueue_time(skb); 1463 1464 spin_lock_bh(&fq->lock); 1465 /* 1466 * For management frames, don't really apply codel etc., 1467 * we don't want to apply any shaping or anything we just 1468 * want to simplify the driver API by having them on the 1469 * txqi. 1470 */ 1471 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1472 IEEE80211_SKB_CB(skb)->control.flags |= 1473 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1474 __skb_queue_tail(&txqi->frags, skb); 1475 } else { 1476 flow_idx = fq_flow_idx(fq, skb); 1477 fq_tin_enqueue(fq, tin, flow_idx, skb, 1478 fq_skb_free_func); 1479 } 1480 spin_unlock_bh(&fq->lock); 1481 } 1482 1483 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1484 struct fq_flow *flow, struct sk_buff *skb, 1485 void *data) 1486 { 1487 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1488 1489 return info->control.vif == data; 1490 } 1491 1492 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1493 struct ieee80211_sub_if_data *sdata) 1494 { 1495 struct fq *fq = &local->fq; 1496 struct txq_info *txqi; 1497 struct fq_tin *tin; 1498 struct ieee80211_sub_if_data *ap; 1499 1500 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1501 return; 1502 1503 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1504 1505 if (!ap->vif.txq) 1506 return; 1507 1508 txqi = to_txq_info(ap->vif.txq); 1509 tin = &txqi->tin; 1510 1511 spin_lock_bh(&fq->lock); 1512 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1513 fq_skb_free_func); 1514 spin_unlock_bh(&fq->lock); 1515 } 1516 1517 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1518 struct sta_info *sta, 1519 struct txq_info *txqi, int tid) 1520 { 1521 fq_tin_init(&txqi->tin); 1522 codel_vars_init(&txqi->def_cvars); 1523 codel_stats_init(&txqi->cstats); 1524 __skb_queue_head_init(&txqi->frags); 1525 INIT_LIST_HEAD(&txqi->schedule_order); 1526 1527 txqi->txq.vif = &sdata->vif; 1528 1529 if (!sta) { 1530 txqi->txq.tid = tid; 1531 1532 if (tid == IEEE80211_NUM_TIDS) { 1533 sdata->vif.txq_mgmt = &txqi->txq; 1534 txqi->txq.ac = IEEE80211_AC_VO; 1535 } else { 1536 sdata->vif.txq = &txqi->txq; 1537 txqi->txq.ac = IEEE80211_AC_BE; 1538 } 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, int radio_idx) 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 = kvzalloc_objs(local->cvars[0], fq->flows_cnt); 1633 if (!local->cvars) { 1634 spin_lock_bh(&fq->lock); 1635 fq_reset(fq, fq_skb_free_func); 1636 spin_unlock_bh(&fq->lock); 1637 return -ENOMEM; 1638 } 1639 1640 for (i = 0; i < fq->flows_cnt; i++) 1641 codel_vars_init(&local->cvars[i]); 1642 1643 ieee80211_txq_set_params(local, -1); 1644 1645 return 0; 1646 } 1647 1648 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1649 { 1650 struct fq *fq = &local->fq; 1651 1652 kvfree(local->cvars); 1653 local->cvars = NULL; 1654 1655 spin_lock_bh(&fq->lock); 1656 fq_reset(fq, fq_skb_free_func); 1657 spin_unlock_bh(&fq->lock); 1658 } 1659 1660 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1661 struct ieee80211_sub_if_data *sdata, 1662 struct sta_info *sta, 1663 struct sk_buff *skb) 1664 { 1665 struct ieee80211_vif *vif; 1666 struct txq_info *txqi; 1667 1668 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1669 return false; 1670 1671 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1672 sdata = container_of(sdata->bss, 1673 struct ieee80211_sub_if_data, u.ap); 1674 1675 vif = &sdata->vif; 1676 txqi = ieee80211_get_txq(local, vif, sta, skb); 1677 1678 if (!txqi) 1679 return false; 1680 1681 ieee80211_txq_enqueue(local, txqi, skb); 1682 1683 schedule_and_wake_txq(local, txqi); 1684 1685 return true; 1686 } 1687 1688 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1689 struct ieee80211_vif *vif, 1690 struct sta_info *sta, 1691 struct sk_buff_head *skbs, 1692 bool txpending) 1693 { 1694 struct ieee80211_tx_control control = {}; 1695 struct sk_buff *skb, *tmp; 1696 unsigned long flags; 1697 1698 skb_queue_walk_safe(skbs, skb, tmp) { 1699 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1700 int q = info->hw_queue; 1701 1702 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1703 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1704 __skb_unlink(skb, skbs); 1705 ieee80211_free_txskb(&local->hw, skb); 1706 continue; 1707 } 1708 #endif 1709 1710 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1711 if (local->queue_stop_reasons[q] || 1712 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1713 if (unlikely(info->flags & 1714 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1715 if (local->queue_stop_reasons[q] & 1716 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1717 /* 1718 * Drop off-channel frames if queues 1719 * are stopped for any reason other 1720 * than off-channel operation. Never 1721 * queue them. 1722 */ 1723 spin_unlock_irqrestore( 1724 &local->queue_stop_reason_lock, 1725 flags); 1726 ieee80211_purge_tx_queue(&local->hw, 1727 skbs); 1728 return true; 1729 } 1730 } else { 1731 1732 /* 1733 * Since queue is stopped, queue up frames for 1734 * later transmission from the tx-pending 1735 * tasklet when the queue is woken again. 1736 */ 1737 if (txpending) 1738 skb_queue_splice_init(skbs, 1739 &local->pending[q]); 1740 else 1741 skb_queue_splice_tail_init(skbs, 1742 &local->pending[q]); 1743 1744 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1745 flags); 1746 return false; 1747 } 1748 } 1749 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1750 1751 info->control.vif = vif; 1752 control.sta = sta ? &sta->sta : NULL; 1753 1754 __skb_unlink(skb, skbs); 1755 drv_tx(local, &control, skb); 1756 } 1757 1758 return true; 1759 } 1760 1761 /* 1762 * Returns false if the frame couldn't be transmitted but was queued instead. 1763 */ 1764 static bool __ieee80211_tx(struct ieee80211_local *local, 1765 struct sk_buff_head *skbs, struct sta_info *sta, 1766 bool txpending) 1767 { 1768 struct ieee80211_tx_info *info; 1769 struct ieee80211_sub_if_data *sdata; 1770 struct ieee80211_vif *vif; 1771 struct sk_buff *skb; 1772 bool result; 1773 1774 if (WARN_ON(skb_queue_empty(skbs))) 1775 return true; 1776 1777 skb = skb_peek(skbs); 1778 info = IEEE80211_SKB_CB(skb); 1779 sdata = vif_to_sdata(info->control.vif); 1780 if (sta && !sta->uploaded) 1781 sta = NULL; 1782 1783 switch (sdata->vif.type) { 1784 case NL80211_IFTYPE_MONITOR: 1785 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1786 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1787 vif = &sdata->vif; 1788 break; 1789 } 1790 sdata = rcu_dereference(local->monitor_sdata); 1791 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 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 tx->sdata->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 tx->sdata->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 kfree_skb(skb); 1922 return false; 1923 } 1924 1925 info->band = band; 1926 info->control.vif = vif; 1927 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1928 1929 if (invoke_tx_handlers(&tx)) 1930 return false; 1931 1932 if (sta) { 1933 if (tx.sta) 1934 *sta = &tx.sta->sta; 1935 else 1936 *sta = NULL; 1937 } 1938 1939 /* this function isn't suitable for fragmented data frames */ 1940 skb2 = __skb_dequeue(&tx.skbs); 1941 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1942 ieee80211_free_txskb(hw, skb2); 1943 ieee80211_purge_tx_queue(hw, &tx.skbs); 1944 return false; 1945 } 1946 1947 return true; 1948 } 1949 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1950 1951 /* 1952 * Returns false if the frame couldn't be transmitted but was queued instead. 1953 */ 1954 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1955 struct sta_info *sta, struct sk_buff *skb, 1956 bool txpending) 1957 { 1958 struct ieee80211_local *local = sdata->local; 1959 struct ieee80211_tx_data tx; 1960 ieee80211_tx_result res_prepare; 1961 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1962 bool result = true; 1963 1964 if (unlikely(skb->len < 10)) { 1965 dev_kfree_skb(skb); 1966 return true; 1967 } 1968 1969 /* initialises tx */ 1970 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1971 1972 if (unlikely(res_prepare == TX_DROP)) { 1973 ieee80211_free_txskb(&local->hw, skb); 1974 tx.sdata->tx_handlers_drop++; 1975 return true; 1976 } else if (unlikely(res_prepare == TX_QUEUED)) { 1977 return true; 1978 } 1979 1980 /* set up hw_queue value early */ 1981 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1982 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1983 info->hw_queue = 1984 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1985 1986 if (invoke_tx_handlers_early(&tx)) 1987 return true; 1988 1989 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1990 return true; 1991 1992 if (!invoke_tx_handlers_late(&tx)) 1993 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1994 1995 return result; 1996 } 1997 1998 /* device xmit handlers */ 1999 2000 enum ieee80211_encrypt { 2001 ENCRYPT_NO, 2002 ENCRYPT_MGMT, 2003 ENCRYPT_DATA, 2004 }; 2005 2006 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 2007 struct sk_buff *skb, 2008 int head_need, 2009 enum ieee80211_encrypt encrypt) 2010 { 2011 struct ieee80211_local *local = sdata->local; 2012 bool enc_tailroom; 2013 int tail_need = 0; 2014 2015 enc_tailroom = encrypt == ENCRYPT_MGMT || 2016 (encrypt == ENCRYPT_DATA && 2017 sdata->crypto_tx_tailroom_needed_cnt); 2018 2019 if (enc_tailroom) { 2020 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2021 tail_need -= skb_tailroom(skb); 2022 tail_need = max_t(int, tail_need, 0); 2023 } 2024 2025 if (skb_cloned(skb) && 2026 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2027 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2028 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2029 else if (head_need || tail_need) 2030 I802_DEBUG_INC(local->tx_expand_skb_head); 2031 else 2032 return 0; 2033 2034 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2035 wiphy_debug(local->hw.wiphy, 2036 "failed to reallocate TX buffer\n"); 2037 return -ENOMEM; 2038 } 2039 2040 return 0; 2041 } 2042 2043 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2044 struct sta_info *sta, struct sk_buff *skb) 2045 { 2046 struct ieee80211_local *local = sdata->local; 2047 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2048 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2049 int headroom; 2050 enum ieee80211_encrypt encrypt; 2051 2052 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2053 encrypt = ENCRYPT_NO; 2054 else if (ieee80211_is_mgmt(hdr->frame_control)) 2055 encrypt = ENCRYPT_MGMT; 2056 else 2057 encrypt = ENCRYPT_DATA; 2058 2059 headroom = local->tx_headroom; 2060 if (encrypt != ENCRYPT_NO) 2061 headroom += IEEE80211_ENCRYPT_HEADROOM; 2062 headroom -= skb_headroom(skb); 2063 headroom = max_t(int, 0, headroom); 2064 2065 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2066 ieee80211_free_txskb(&local->hw, skb); 2067 return; 2068 } 2069 2070 /* reload after potential resize */ 2071 hdr = (struct ieee80211_hdr *) skb->data; 2072 info->control.vif = &sdata->vif; 2073 2074 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2075 if (ieee80211_is_data(hdr->frame_control) && 2076 is_unicast_ether_addr(hdr->addr1)) { 2077 if (mesh_nexthop_resolve(sdata, skb)) 2078 return; /* skb queued: don't free */ 2079 } else { 2080 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2081 } 2082 } 2083 2084 ieee80211_set_qos_hdr(sdata, skb); 2085 ieee80211_tx(sdata, sta, skb, false); 2086 } 2087 2088 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2089 { 2090 struct ieee80211_radiotap_header *rthdr = 2091 (struct ieee80211_radiotap_header *)skb->data; 2092 2093 /* check for not even having the fixed radiotap header part */ 2094 if (unlikely(skb_headlen(skb) < sizeof(struct ieee80211_radiotap_header))) 2095 return false; /* too short to be possibly valid */ 2096 2097 /* is it a header version we can trust to find length from? */ 2098 if (unlikely(rthdr->it_version)) 2099 return false; /* only version 0 is supported */ 2100 2101 /* does the skb contain enough to deliver on the alleged length? */ 2102 if (unlikely(skb_headlen(skb) < ieee80211_get_radiotap_len(skb->data))) 2103 return false; /* skb too short for claimed rt header extent */ 2104 2105 return true; 2106 } 2107 2108 static bool ieee80211_rate_bw_usable(u16 rate_flags, 2109 const struct cfg80211_chan_def *chandef) 2110 { 2111 int width; 2112 2113 if (!chandef) 2114 return true; 2115 2116 if (rate_flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 2117 width = 160; 2118 else if (rate_flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 2119 width = 80; 2120 else if (rate_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 2121 width = 40; 2122 else 2123 return true; 2124 2125 return width <= cfg80211_chandef_get_width(chandef); 2126 } 2127 2128 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2129 struct net_device *dev, 2130 const struct cfg80211_chan_def *chandef) 2131 { 2132 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2133 struct ieee80211_radiotap_iterator iterator; 2134 struct ieee80211_radiotap_header *rthdr = 2135 (struct ieee80211_radiotap_header *) skb->data; 2136 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2137 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2138 NULL); 2139 u16 txflags; 2140 u16 rate = 0; 2141 bool rate_found = false; 2142 u8 rate_retries = 0; 2143 u16 rate_flags = 0; 2144 u8 mcs_known, mcs_flags, mcs_bw; 2145 u16 vht_known; 2146 u8 vht_mcs = 0, vht_nss = 0; 2147 int i; 2148 2149 if (!ieee80211_validate_radiotap_len(skb)) 2150 return false; 2151 2152 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2153 IEEE80211_TX_CTL_DONTFRAG; 2154 2155 /* 2156 * for every radiotap entry that is present 2157 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2158 * entries present, or -EINVAL on error) 2159 */ 2160 2161 while (!ret) { 2162 ret = ieee80211_radiotap_iterator_next(&iterator); 2163 2164 if (ret) 2165 continue; 2166 2167 /* see if this argument is something we can use */ 2168 switch (iterator.this_arg_index) { 2169 /* 2170 * You must take care when dereferencing iterator.this_arg 2171 * for multibyte types... the pointer is not aligned. Use 2172 * get_unaligned((type *)iterator.this_arg) to dereference 2173 * iterator.this_arg for type "type" safely on all arches. 2174 */ 2175 case IEEE80211_RADIOTAP_FLAGS: 2176 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2177 /* 2178 * this indicates that the skb we have been 2179 * handed has the 32-bit FCS CRC at the end... 2180 * we should react to that by snipping it off 2181 * because it will be recomputed and added 2182 * on transmission 2183 */ 2184 if (skb->len < (iterator._max_length + FCS_LEN)) 2185 return false; 2186 2187 skb_trim(skb, skb->len - FCS_LEN); 2188 } 2189 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2190 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2191 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2192 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2193 break; 2194 2195 case IEEE80211_RADIOTAP_TX_FLAGS: 2196 txflags = get_unaligned_le16(iterator.this_arg); 2197 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2198 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2199 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2200 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2201 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2202 info->control.flags |= 2203 IEEE80211_TX_CTRL_DONT_REORDER; 2204 break; 2205 2206 case IEEE80211_RADIOTAP_RATE: 2207 rate = *iterator.this_arg; 2208 rate_flags = 0; 2209 rate_found = true; 2210 break; 2211 2212 case IEEE80211_RADIOTAP_ANTENNA: 2213 /* this can appear multiple times, keep a bitmap */ 2214 /* control.antennas is only a 2-bit bitmap */ 2215 if (*iterator.this_arg < 2) 2216 info->control.antennas |= BIT(*iterator.this_arg); 2217 break; 2218 2219 case IEEE80211_RADIOTAP_DATA_RETRIES: 2220 rate_retries = *iterator.this_arg; 2221 break; 2222 2223 case IEEE80211_RADIOTAP_MCS: 2224 mcs_known = iterator.this_arg[0]; 2225 mcs_flags = iterator.this_arg[1]; 2226 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2227 break; 2228 2229 rate_found = true; 2230 rate = iterator.this_arg[2]; 2231 rate_flags = IEEE80211_TX_RC_MCS; 2232 2233 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2234 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2235 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2236 2237 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2238 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2239 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2240 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2241 2242 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2243 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2244 info->flags |= IEEE80211_TX_CTL_LDPC; 2245 2246 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2247 u8 stbc = u8_get_bits(mcs_flags, 2248 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2249 2250 info->flags |= 2251 u32_encode_bits(stbc, 2252 IEEE80211_TX_CTL_STBC); 2253 } 2254 break; 2255 2256 case IEEE80211_RADIOTAP_VHT: 2257 vht_known = get_unaligned_le16(iterator.this_arg); 2258 rate_found = true; 2259 2260 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2261 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2262 (iterator.this_arg[2] & 2263 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2264 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2265 if (vht_known & 2266 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2267 if (iterator.this_arg[3] == 1) 2268 rate_flags |= 2269 IEEE80211_TX_RC_40_MHZ_WIDTH; 2270 else if (iterator.this_arg[3] == 4) 2271 rate_flags |= 2272 IEEE80211_TX_RC_80_MHZ_WIDTH; 2273 else if (iterator.this_arg[3] == 11) 2274 rate_flags |= 2275 IEEE80211_TX_RC_160_MHZ_WIDTH; 2276 } 2277 2278 vht_mcs = iterator.this_arg[4] >> 4; 2279 if (vht_mcs > 11) 2280 vht_mcs = 0; 2281 vht_nss = iterator.this_arg[4] & 0xF; 2282 if (!vht_nss || vht_nss > 8) 2283 vht_nss = 1; 2284 break; 2285 2286 /* 2287 * Please update the file 2288 * Documentation/networking/mac80211-injection.rst 2289 * when parsing new fields here. 2290 */ 2291 2292 default: 2293 break; 2294 } 2295 } 2296 2297 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2298 return false; 2299 2300 if (rate_found) { 2301 struct ieee80211_supported_band *sband = 2302 local->hw.wiphy->bands[info->band]; 2303 2304 if (!ieee80211_rate_bw_usable(rate_flags, chandef)) 2305 return false; 2306 2307 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2308 2309 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2310 info->control.rates[i].idx = -1; 2311 info->control.rates[i].flags = 0; 2312 info->control.rates[i].count = 0; 2313 } 2314 2315 if (rate_flags & IEEE80211_TX_RC_MCS) { 2316 /* reset antennas if not enough */ 2317 if (IEEE80211_HT_MCS_CHAINS(rate) > 2318 hweight8(info->control.antennas)) 2319 info->control.antennas = 0; 2320 2321 info->control.rates[0].idx = rate; 2322 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2323 /* reset antennas if not enough */ 2324 if (vht_nss > hweight8(info->control.antennas)) 2325 info->control.antennas = 0; 2326 2327 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2328 vht_nss); 2329 } else if (sband) { 2330 for (i = 0; i < sband->n_bitrates; i++) { 2331 if (rate * 5 != sband->bitrates[i].bitrate) 2332 continue; 2333 2334 info->control.rates[0].idx = i; 2335 break; 2336 } 2337 } 2338 2339 if (info->control.rates[0].idx < 0) 2340 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2341 2342 info->control.rates[0].flags = rate_flags; 2343 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2344 local->hw.max_rate_tries); 2345 } 2346 2347 return true; 2348 } 2349 2350 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2351 struct net_device *dev) 2352 { 2353 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2354 struct ieee80211_chanctx_conf *chanctx_conf; 2355 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2356 struct ieee80211_hdr *hdr; 2357 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2358 struct cfg80211_chan_def *chandef; 2359 u16 len_rthdr; 2360 int hdrlen; 2361 2362 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2363 if (unlikely(!ieee80211_sdata_running(sdata))) 2364 goto fail; 2365 2366 memset(info, 0, sizeof(*info)); 2367 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2368 IEEE80211_TX_CTL_INJECTED; 2369 2370 /* Sanity-check the length of the radiotap header */ 2371 if (!ieee80211_validate_radiotap_len(skb)) 2372 goto fail; 2373 2374 /* we now know there is a radiotap header with a length we can use */ 2375 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2376 2377 /* 2378 * fix up the pointers accounting for the radiotap 2379 * header still being in there. We are being given 2380 * a precooked IEEE80211 header so no need for 2381 * normal processing 2382 */ 2383 skb_set_mac_header(skb, len_rthdr); 2384 /* 2385 * these are just fixed to the end of the rt area since we 2386 * don't have any better information and at this point, nobody cares 2387 */ 2388 skb_set_network_header(skb, len_rthdr); 2389 skb_set_transport_header(skb, len_rthdr); 2390 2391 if (skb_headlen(skb) < len_rthdr + 2) 2392 goto fail; 2393 2394 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2395 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2396 2397 if (skb_headlen(skb) < len_rthdr + hdrlen) 2398 goto fail; 2399 2400 /* 2401 * Initialize skb->protocol if the injected frame is a data frame 2402 * carrying a rfc1042 header 2403 */ 2404 if (ieee80211_is_data(hdr->frame_control) && 2405 skb_headlen(skb) >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2406 u8 *payload = (u8 *)hdr + hdrlen; 2407 2408 if (ether_addr_equal(payload, rfc1042_header)) 2409 skb->protocol = cpu_to_be16((payload[6] << 8) | 2410 payload[7]); 2411 } 2412 2413 rcu_read_lock(); 2414 2415 /* 2416 * We process outgoing injected frames that have a local address 2417 * we handle as though they are non-injected frames. 2418 * This code here isn't entirely correct, the local MAC address 2419 * isn't always enough to find the interface to use; for proper 2420 * VLAN support we have an nl80211-based mechanism. 2421 * 2422 * This is necessary, for example, for old hostapd versions that 2423 * don't use nl80211-based management TX/RX. 2424 */ 2425 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2426 if (!ieee80211_sdata_running(tmp_sdata)) 2427 continue; 2428 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2429 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2430 continue; 2431 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2432 sdata = tmp_sdata; 2433 break; 2434 } 2435 } 2436 2437 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2438 if (!chanctx_conf) { 2439 tmp_sdata = rcu_dereference(local->monitor_sdata); 2440 if (tmp_sdata) 2441 chanctx_conf = 2442 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2443 } 2444 2445 if (!chanctx_conf) { 2446 struct ieee80211_chanctx *ctx; 2447 bool first = true; 2448 2449 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) { 2450 if (!first) 2451 goto fail_rcu; 2452 chanctx_conf = &ctx->conf; 2453 first = false; 2454 } 2455 } 2456 2457 if (chanctx_conf) 2458 chandef = &chanctx_conf->def; 2459 else 2460 goto fail_rcu; 2461 2462 /* 2463 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2464 * shouldn't transmit on disabled channels. 2465 */ 2466 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2467 IEEE80211_CHAN_DISABLED)) 2468 goto fail_rcu; 2469 2470 /* 2471 * Frame injection is not allowed if beaconing is not allowed 2472 * or if we need radar detection. Beaconing is usually not allowed when 2473 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2474 * Passive scan is also used in world regulatory domains where 2475 * your country is not known and as such it should be treated as 2476 * NO TX unless the channel is explicitly allowed in which case 2477 * your current regulatory domain would not have the passive scan 2478 * flag. 2479 * 2480 * Since AP mode uses monitor interfaces to inject/TX management 2481 * frames we can make AP mode the exception to this rule once it 2482 * supports radar detection as its implementation can deal with 2483 * radar detection by itself. We can do that later by adding a 2484 * monitor flag interfaces used for AP support. 2485 */ 2486 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2487 sdata->vif.type)) 2488 goto fail_rcu; 2489 2490 info->band = chandef->chan->band; 2491 2492 /* Initialize skb->priority according to frame type and TID class, 2493 * with respect to the sub interface that the frame will actually 2494 * be transmitted on. If the DONT_REORDER flag is set, the original 2495 * skb-priority is preserved to assure frames injected with this 2496 * flag are not reordered relative to each other. 2497 */ 2498 ieee80211_select_queue_80211(sdata, skb, hdr); 2499 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2500 2501 /* 2502 * Process the radiotap header. This will now take into account the 2503 * selected chandef above to accurately set injection rates and 2504 * retransmissions. 2505 */ 2506 if (!ieee80211_parse_tx_radiotap(skb, dev, chandef)) 2507 goto fail_rcu; 2508 2509 /* remove the injection radiotap header */ 2510 skb_pull(skb, len_rthdr); 2511 2512 ieee80211_xmit(sdata, NULL, skb); 2513 rcu_read_unlock(); 2514 2515 return NETDEV_TX_OK; 2516 2517 fail_rcu: 2518 rcu_read_unlock(); 2519 fail: 2520 dev_kfree_skb(skb); 2521 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2522 } 2523 2524 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2525 { 2526 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2527 2528 return ethertype == ETH_P_TDLS && 2529 skb->len > 14 && 2530 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2531 } 2532 2533 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2534 struct sk_buff *skb, 2535 struct sta_info **sta_out, bool bss) 2536 { 2537 struct sta_info *sta; 2538 2539 switch (sdata->vif.type) { 2540 case NL80211_IFTYPE_AP_VLAN: 2541 sta = rcu_dereference(sdata->u.vlan.sta); 2542 if (sta) { 2543 *sta_out = sta; 2544 return 0; 2545 } else if (sdata->wdev.use_4addr) { 2546 return -ENOLINK; 2547 } 2548 fallthrough; 2549 case NL80211_IFTYPE_AP: 2550 case NL80211_IFTYPE_OCB: 2551 case NL80211_IFTYPE_ADHOC: 2552 if (is_multicast_ether_addr(skb->data)) { 2553 *sta_out = ERR_PTR(-ENOENT); 2554 return 0; 2555 } 2556 if (bss) 2557 sta = sta_info_get_bss(sdata, skb->data); 2558 else 2559 sta = sta_info_get(sdata, skb->data); 2560 break; 2561 #ifdef CONFIG_MAC80211_MESH 2562 case NL80211_IFTYPE_MESH_POINT: 2563 /* determined much later */ 2564 *sta_out = NULL; 2565 return 0; 2566 #endif 2567 case NL80211_IFTYPE_STATION: 2568 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2569 sta = sta_info_get(sdata, skb->data); 2570 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2571 if (test_sta_flag(sta, 2572 WLAN_STA_TDLS_PEER_AUTH)) { 2573 *sta_out = sta; 2574 return 0; 2575 } 2576 2577 /* 2578 * TDLS link during setup - throw out frames to 2579 * peer. Allow TDLS-setup frames to unauthorized 2580 * peers for the special case of a link teardown 2581 * after a TDLS sta is removed due to being 2582 * unreachable. 2583 */ 2584 if (!ieee80211_is_tdls_setup(skb)) 2585 return -EINVAL; 2586 } 2587 2588 } 2589 2590 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2591 if (!sta) 2592 return -ENOLINK; 2593 break; 2594 case NL80211_IFTYPE_NAN_DATA: 2595 if (is_multicast_ether_addr(skb->data)) { 2596 *sta_out = ERR_PTR(-ENOENT); 2597 return 0; 2598 } 2599 sta = sta_info_get(sdata, skb->data); 2600 break; 2601 default: 2602 return -EINVAL; 2603 } 2604 2605 *sta_out = sta ?: ERR_PTR(-ENOENT); 2606 return 0; 2607 } 2608 2609 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2610 struct sk_buff *skb, 2611 u32 *info_flags, 2612 u64 cookie) 2613 { 2614 struct sk_buff *ack_skb; 2615 u16 info_id = 0; 2616 2617 if (skb->sk) 2618 ack_skb = skb_clone_sk(skb); 2619 else 2620 ack_skb = skb_clone(skb, GFP_ATOMIC); 2621 2622 if (ack_skb) { 2623 unsigned long flags; 2624 int id; 2625 2626 spin_lock_irqsave(&local->ack_status_lock, flags); 2627 id = idr_alloc(&local->ack_status_frames, ack_skb, 2628 1, 0x2000, GFP_ATOMIC); 2629 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2630 2631 if (id >= 0) { 2632 info_id = id; 2633 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2634 if (cookie) 2635 IEEE80211_SKB_CB(ack_skb)->ack.cookie = cookie; 2636 } else { 2637 kfree_skb(ack_skb); 2638 } 2639 } 2640 2641 return info_id; 2642 } 2643 2644 static void ieee80211_remove_ack_skb(struct ieee80211_local *local, u16 info_id) 2645 { 2646 struct sk_buff *ack_skb; 2647 unsigned long flags; 2648 2649 spin_lock_irqsave(&local->ack_status_lock, flags); 2650 ack_skb = idr_remove(&local->ack_status_frames, info_id); 2651 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2652 2653 kfree_skb(ack_skb); 2654 } 2655 2656 /** 2657 * ieee80211_build_hdr - build 802.11 header in the given frame 2658 * @sdata: virtual interface to build the header for 2659 * @skb: the skb to build the header in 2660 * @info_flags: skb flags to set 2661 * @sta: the station pointer 2662 * @ctrl_flags: info control flags to set 2663 * @cookie: cookie pointer to fill (if not %NULL) 2664 * 2665 * This function takes the skb with 802.3 header and reformats the header to 2666 * the appropriate IEEE 802.11 header based on which interface the packet is 2667 * being transmitted on. 2668 * 2669 * Note that this function also takes care of the TX status request and 2670 * potential unsharing of the SKB - this needs to be interleaved with the 2671 * header building. 2672 * 2673 * The function requires the read-side RCU lock held 2674 * 2675 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2676 */ 2677 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2678 struct sk_buff *skb, u32 info_flags, 2679 struct sta_info *sta, u32 ctrl_flags, 2680 u64 cookie) 2681 { 2682 struct ieee80211_local *local = sdata->local; 2683 struct ieee80211_tx_info *info; 2684 int head_need; 2685 u16 ethertype, hdrlen, meshhdrlen = 0; 2686 __le16 fc; 2687 struct ieee80211_hdr hdr; 2688 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2689 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2690 const u8 *encaps_data; 2691 int encaps_len, skip_header_bytes; 2692 bool wme_sta = false, authorized = false; 2693 bool tdls_peer; 2694 bool multicast; 2695 u16 info_id = 0; 2696 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2697 enum nl80211_band band; 2698 int ret; 2699 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2700 2701 if (IS_ERR(sta)) 2702 sta = NULL; 2703 2704 #ifdef CONFIG_MAC80211_DEBUGFS 2705 if (local->force_tx_status) 2706 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2707 #endif 2708 2709 /* convert Ethernet header to proper 802.11 header (based on 2710 * operation mode) */ 2711 ethertype = (skb->data[12] << 8) | skb->data[13]; 2712 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2713 2714 if (!ieee80211_vif_is_mld(&sdata->vif)) 2715 chanctx_conf = 2716 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2717 2718 switch (sdata->vif.type) { 2719 case NL80211_IFTYPE_AP_VLAN: 2720 if (sdata->wdev.use_4addr) { 2721 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2722 /* RA TA DA SA */ 2723 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2724 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2725 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2726 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2727 hdrlen = 30; 2728 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2729 wme_sta = sta->sta.wme; 2730 } 2731 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2732 struct ieee80211_sub_if_data *ap_sdata; 2733 2734 /* override chanctx_conf from AP (we don't have one) */ 2735 ap_sdata = container_of(sdata->bss, 2736 struct ieee80211_sub_if_data, 2737 u.ap); 2738 chanctx_conf = 2739 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2740 } 2741 if (sdata->wdev.use_4addr) 2742 break; 2743 fallthrough; 2744 case NL80211_IFTYPE_AP: 2745 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2746 /* DA BSSID SA */ 2747 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2748 2749 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2750 struct ieee80211_link_data *link; 2751 2752 link_id = sta->deflink.link_id; 2753 link = rcu_dereference(sdata->link[link_id]); 2754 if (WARN_ON(!link)) { 2755 ret = -ENOLINK; 2756 goto free; 2757 } 2758 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2759 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2760 (sta && sta->sta.mlo)) { 2761 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2762 } else { 2763 struct ieee80211_bss_conf *conf; 2764 2765 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2766 if (unlikely(!conf)) { 2767 ret = -ENOLINK; 2768 goto free; 2769 } 2770 2771 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2772 } 2773 2774 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2775 hdrlen = 24; 2776 break; 2777 #ifdef CONFIG_MAC80211_MESH 2778 case NL80211_IFTYPE_MESH_POINT: 2779 if (!is_multicast_ether_addr(skb->data)) { 2780 struct sta_info *next_hop; 2781 bool mpp_lookup = true; 2782 2783 mpath = mesh_path_lookup(sdata, skb->data); 2784 if (mpath) { 2785 mpp_lookup = false; 2786 next_hop = rcu_dereference(mpath->next_hop); 2787 if (!next_hop || 2788 !(mpath->flags & (MESH_PATH_ACTIVE | 2789 MESH_PATH_RESOLVING))) 2790 mpp_lookup = true; 2791 } 2792 2793 if (mpp_lookup) { 2794 mppath = mpp_path_lookup(sdata, skb->data); 2795 if (mppath) 2796 mppath->exp_time = jiffies; 2797 } 2798 2799 if (mppath && mpath) 2800 mesh_path_del(sdata, mpath->dst); 2801 } 2802 2803 /* 2804 * Use address extension if it is a packet from 2805 * another interface or if we know the destination 2806 * is being proxied by a portal (i.e. portal address 2807 * differs from proxied address) 2808 */ 2809 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2810 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2811 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2812 skb->data, skb->data + ETH_ALEN); 2813 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2814 NULL, NULL); 2815 } else { 2816 /* DS -> MBSS (802.11-2012 13.11.3.3). 2817 * For unicast with unknown forwarding information, 2818 * destination might be in the MBSS or if that fails 2819 * forwarded to another mesh gate. In either case 2820 * resolution will be handled in ieee80211_xmit(), so 2821 * leave the original DA. This also works for mcast */ 2822 const u8 *mesh_da = skb->data; 2823 2824 if (mppath) 2825 mesh_da = mppath->mpp; 2826 else if (mpath) 2827 mesh_da = mpath->dst; 2828 2829 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2830 mesh_da, sdata->vif.addr); 2831 if (is_multicast_ether_addr(mesh_da)) 2832 /* DA TA mSA AE:SA */ 2833 meshhdrlen = ieee80211_new_mesh_header( 2834 sdata, &mesh_hdr, 2835 skb->data + ETH_ALEN, NULL); 2836 else 2837 /* RA TA mDA mSA AE:DA SA */ 2838 meshhdrlen = ieee80211_new_mesh_header( 2839 sdata, &mesh_hdr, skb->data, 2840 skb->data + ETH_ALEN); 2841 2842 } 2843 2844 /* For injected frames, fill RA right away as nexthop lookup 2845 * will be skipped. 2846 */ 2847 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2848 is_zero_ether_addr(hdr.addr1)) 2849 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2850 break; 2851 #endif 2852 case NL80211_IFTYPE_STATION: 2853 /* we already did checks when looking up the RA STA */ 2854 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2855 2856 if (tdls_peer) { 2857 /* For TDLS only one link can be valid with peer STA */ 2858 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2859 struct ieee80211_link_data *link; 2860 2861 /* DA SA BSSID */ 2862 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2863 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2864 link = rcu_dereference(sdata->link[tdls_link_id]); 2865 if (WARN_ON_ONCE(!link)) { 2866 ret = -EINVAL; 2867 goto free; 2868 } 2869 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2870 hdrlen = 24; 2871 } else if (sdata->u.mgd.use_4addr && 2872 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2873 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2874 IEEE80211_FCTL_TODS); 2875 /* RA TA DA SA */ 2876 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2877 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2878 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2879 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2880 hdrlen = 30; 2881 } else { 2882 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2883 /* BSSID SA DA */ 2884 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2885 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2886 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2887 hdrlen = 24; 2888 } 2889 break; 2890 case NL80211_IFTYPE_OCB: 2891 /* DA SA BSSID */ 2892 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2893 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2894 eth_broadcast_addr(hdr.addr3); 2895 hdrlen = 24; 2896 break; 2897 case NL80211_IFTYPE_ADHOC: 2898 /* DA SA BSSID */ 2899 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2900 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2901 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2902 hdrlen = 24; 2903 break; 2904 case NL80211_IFTYPE_NAN_DATA: { 2905 struct ieee80211_sub_if_data *nmi; 2906 2907 /* DA SA Cluster ID */ 2908 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2909 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2910 nmi = rcu_dereference(sdata->u.nan_data.nmi); 2911 if (!nmi) { 2912 ret = -ENOTCONN; 2913 goto free; 2914 } 2915 memcpy(hdr.addr3, nmi->u.nan.conf.cluster_id, ETH_ALEN); 2916 hdrlen = 24; 2917 break; 2918 } 2919 default: 2920 ret = -EINVAL; 2921 goto free; 2922 } 2923 2924 if (!chanctx_conf) { 2925 if (sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 2926 /* NAN operates on multiple bands */ 2927 band = NUM_NL80211_BANDS; 2928 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 2929 ret = -ENOTCONN; 2930 goto free; 2931 } else { 2932 /* MLD transmissions must not rely on the band */ 2933 band = 0; 2934 } 2935 } else { 2936 band = chanctx_conf->def.chan->band; 2937 } 2938 2939 multicast = is_multicast_ether_addr(hdr.addr1); 2940 2941 /* sta is always NULL for mesh */ 2942 if (sta) { 2943 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2944 wme_sta = sta->sta.wme; 2945 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2946 /* For mesh, the use of the QoS header is mandatory */ 2947 wme_sta = true; 2948 } 2949 2950 /* receiver does QoS (which also means we do) use it */ 2951 if (wme_sta) { 2952 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2953 hdrlen += 2; 2954 } 2955 2956 /* 2957 * Drop unicast frames to unauthorised stations unless they are 2958 * EAPOL frames from the local station. 2959 */ 2960 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2961 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2962 !multicast && !authorized && 2963 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2964 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2965 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2966 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2967 sdata->name, hdr.addr1); 2968 #endif 2969 2970 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2971 2972 ret = -EPERM; 2973 goto free; 2974 } 2975 2976 if (unlikely(!multicast && 2977 (sk_requests_wifi_status(skb->sk) || 2978 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2979 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2980 cookie); 2981 2982 /* 2983 * If the skb is shared we need to obtain our own copy. 2984 */ 2985 skb = skb_share_check(skb, GFP_ATOMIC); 2986 if (unlikely(!skb)) { 2987 /* skb_share_check() already freed the skb */ 2988 if (info_id) 2989 ieee80211_remove_ack_skb(local, info_id); 2990 return ERR_PTR(-ENOMEM); 2991 } 2992 2993 /* set this up so failure paths can clean up ack skb */ 2994 info = IEEE80211_SKB_CB(skb); 2995 memset(info, 0, sizeof(*info)); 2996 2997 info->flags = info_flags; 2998 if (info_id) { 2999 info->status_data = info_id; 3000 info->status_data_idr = 1; 3001 } 3002 info->band = band; 3003 3004 hdr.frame_control = fc; 3005 hdr.duration_id = 0; 3006 hdr.seq_ctrl = 0; 3007 3008 skip_header_bytes = ETH_HLEN; 3009 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 3010 encaps_data = bridge_tunnel_header; 3011 encaps_len = sizeof(bridge_tunnel_header); 3012 skip_header_bytes -= 2; 3013 } else if (ethertype >= ETH_P_802_3_MIN) { 3014 encaps_data = rfc1042_header; 3015 encaps_len = sizeof(rfc1042_header); 3016 skip_header_bytes -= 2; 3017 } else { 3018 encaps_data = NULL; 3019 encaps_len = 0; 3020 } 3021 3022 skb_pull(skb, skip_header_bytes); 3023 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 3024 3025 /* 3026 * So we need to modify the skb header and hence need a copy of 3027 * that. The head_need variable above doesn't, so far, include 3028 * the needed header space that we don't need right away. If we 3029 * can, then we don't reallocate right now but only after the 3030 * frame arrives at the master device (if it does...) 3031 * 3032 * If we cannot, however, then we will reallocate to include all 3033 * the ever needed space. Also, if we need to reallocate it anyway, 3034 * make it big enough for everything we may ever need. 3035 */ 3036 3037 if (head_need > 0 || skb_cloned(skb)) { 3038 head_need += IEEE80211_ENCRYPT_HEADROOM; 3039 head_need += local->tx_headroom; 3040 head_need = max_t(int, 0, head_need); 3041 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 3042 ret = -ENOMEM; 3043 goto free_txskb; 3044 } 3045 } 3046 3047 if (encaps_data) 3048 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 3049 3050 #ifdef CONFIG_MAC80211_MESH 3051 if (meshhdrlen > 0) 3052 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 3053 #endif 3054 3055 if (ieee80211_is_data_qos(fc)) { 3056 __le16 *qos_control; 3057 3058 qos_control = skb_push(skb, 2); 3059 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 3060 /* 3061 * Maybe we could actually set some fields here, for now just 3062 * initialise to zero to indicate no special operation. 3063 */ 3064 *qos_control = 0; 3065 } else 3066 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 3067 3068 skb_reset_mac_header(skb); 3069 3070 if (likely(!cookie)) { 3071 ctrl_flags |= u32_encode_bits(link_id, 3072 IEEE80211_TX_CTRL_MLO_LINK); 3073 } else { 3074 unsigned int pre_conf_link_id; 3075 3076 /* 3077 * ctrl_flags already have been set by 3078 * ieee80211_tx_control_port(), here 3079 * we just sanity check that 3080 */ 3081 3082 pre_conf_link_id = u32_get_bits(ctrl_flags, 3083 IEEE80211_TX_CTRL_MLO_LINK); 3084 3085 if (pre_conf_link_id != link_id && 3086 link_id != IEEE80211_LINK_UNSPECIFIED) { 3087 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 3088 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 3089 sdata->name, hdr.addr1, 3090 pre_conf_link_id, link_id); 3091 #endif 3092 ret = -EINVAL; 3093 goto free_txskb; 3094 } 3095 } 3096 3097 info->control.flags = ctrl_flags; 3098 3099 return skb; 3100 free_txskb: 3101 ieee80211_free_txskb(&local->hw, skb); 3102 return ERR_PTR(ret); 3103 free: 3104 kfree_skb(skb); 3105 return ERR_PTR(ret); 3106 } 3107 3108 /* 3109 * fast-xmit overview 3110 * 3111 * The core idea of this fast-xmit is to remove per-packet checks by checking 3112 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3113 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3114 * much less work can be done per packet. For example, fragmentation must be 3115 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3116 * in the code here. 3117 * 3118 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3119 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3120 * 3121 * The most difficult part of this is that when any of these assumptions 3122 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3123 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3124 * since the per-packet code no longer checks the conditions. This is reflected 3125 * by the calls to these functions throughout the rest of the code, and must be 3126 * maintained if any of the TX path checks change. 3127 */ 3128 3129 void ieee80211_check_fast_xmit(struct sta_info *sta) 3130 { 3131 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3132 struct ieee80211_local *local = sta->local; 3133 struct ieee80211_sub_if_data *sdata = sta->sdata; 3134 struct ieee80211_hdr *hdr = (void *)build.hdr; 3135 struct ieee80211_chanctx_conf *chanctx_conf; 3136 __le16 fc; 3137 3138 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3139 return; 3140 3141 if (ieee80211_vif_is_mesh(&sdata->vif)) 3142 mesh_fast_tx_flush_sta(sdata, sta); 3143 3144 /* Locking here protects both the pointer itself, and against concurrent 3145 * invocations winning data access races to, e.g., the key pointer that 3146 * is used. 3147 * Without it, the invocation of this function right after the key 3148 * pointer changes wouldn't be sufficient, as another CPU could access 3149 * the pointer, then stall, and then do the cache update after the CPU 3150 * that invalidated the key. 3151 * With the locking, such scenarios cannot happen as the check for the 3152 * key and the fast-tx assignment are done atomically, so the CPU that 3153 * modifies the key will either wait or other one will see the key 3154 * cleared/changed already. 3155 */ 3156 spin_lock_bh(&sta->lock); 3157 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3158 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3159 sdata->vif.type == NL80211_IFTYPE_STATION) 3160 goto out; 3161 3162 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3163 goto out; 3164 3165 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3166 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3167 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3168 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3169 goto out; 3170 3171 if (sdata->noack_map) 3172 goto out; 3173 3174 /* fast-xmit doesn't handle fragmentation at all */ 3175 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3176 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3177 goto out; 3178 3179 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3180 rcu_read_lock(); 3181 chanctx_conf = 3182 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3183 if (!chanctx_conf) { 3184 rcu_read_unlock(); 3185 goto out; 3186 } 3187 build.band = chanctx_conf->def.chan->band; 3188 rcu_read_unlock(); 3189 } else { 3190 /* MLD transmissions must not rely on the band */ 3191 build.band = 0; 3192 } 3193 3194 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3195 3196 switch (sdata->vif.type) { 3197 case NL80211_IFTYPE_ADHOC: 3198 /* DA SA BSSID */ 3199 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3200 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3201 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3202 build.hdr_len = 24; 3203 break; 3204 case NL80211_IFTYPE_STATION: 3205 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3206 /* For TDLS only one link can be valid with peer STA */ 3207 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3208 struct ieee80211_link_data *link; 3209 3210 /* DA SA BSSID */ 3211 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3212 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3213 rcu_read_lock(); 3214 link = rcu_dereference(sdata->link[tdls_link_id]); 3215 if (!WARN_ON_ONCE(!link)) 3216 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3217 rcu_read_unlock(); 3218 build.hdr_len = 24; 3219 break; 3220 } 3221 3222 if (sdata->u.mgd.use_4addr) { 3223 /* non-regular ethertype cannot use the fastpath */ 3224 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3225 IEEE80211_FCTL_TODS); 3226 /* RA TA DA SA */ 3227 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3228 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3229 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3230 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3231 build.hdr_len = 30; 3232 break; 3233 } 3234 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3235 /* BSSID SA DA */ 3236 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3237 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3238 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3239 build.hdr_len = 24; 3240 break; 3241 case NL80211_IFTYPE_AP_VLAN: 3242 if (sdata->wdev.use_4addr) { 3243 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3244 IEEE80211_FCTL_TODS); 3245 /* RA TA DA SA */ 3246 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3247 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3248 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3249 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3250 build.hdr_len = 30; 3251 break; 3252 } 3253 fallthrough; 3254 case NL80211_IFTYPE_AP: 3255 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3256 /* DA BSSID SA */ 3257 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3258 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3259 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3260 } else { 3261 unsigned int link_id = sta->deflink.link_id; 3262 struct ieee80211_link_data *link; 3263 3264 rcu_read_lock(); 3265 link = rcu_dereference(sdata->link[link_id]); 3266 if (WARN_ON(!link)) { 3267 rcu_read_unlock(); 3268 goto out; 3269 } 3270 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3271 rcu_read_unlock(); 3272 } 3273 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3274 build.hdr_len = 24; 3275 break; 3276 default: 3277 /* not handled on fast-xmit */ 3278 goto out; 3279 } 3280 3281 if (sta->sta.wme) { 3282 build.hdr_len += 2; 3283 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3284 } 3285 3286 /* We store the key here so there's no point in using rcu_dereference() 3287 * but that's fine because the code that changes the pointers will call 3288 * this function after doing so. For a single CPU that would be enough, 3289 * for multiple see the comment above. 3290 */ 3291 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3292 if (!build.key) 3293 build.key = rcu_access_pointer(sdata->default_unicast_key); 3294 if (build.key) { 3295 bool gen_iv, iv_spc, mmic; 3296 3297 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3298 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3299 mmic = build.key->conf.flags & 3300 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3301 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3302 3303 /* don't handle software crypto */ 3304 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3305 goto out; 3306 3307 /* Key is being removed */ 3308 if (build.key->flags & KEY_FLAG_TAINTED) 3309 goto out; 3310 3311 switch (build.key->conf.cipher) { 3312 case WLAN_CIPHER_SUITE_CCMP: 3313 case WLAN_CIPHER_SUITE_CCMP_256: 3314 if (gen_iv) 3315 build.pn_offs = build.hdr_len; 3316 if (gen_iv || iv_spc) 3317 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3318 break; 3319 case WLAN_CIPHER_SUITE_GCMP: 3320 case WLAN_CIPHER_SUITE_GCMP_256: 3321 if (gen_iv) 3322 build.pn_offs = build.hdr_len; 3323 if (gen_iv || iv_spc) 3324 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3325 break; 3326 case WLAN_CIPHER_SUITE_TKIP: 3327 /* cannot handle MMIC or IV generation in xmit-fast */ 3328 if (mmic || gen_iv) 3329 goto out; 3330 if (iv_spc) 3331 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3332 break; 3333 case WLAN_CIPHER_SUITE_WEP40: 3334 case WLAN_CIPHER_SUITE_WEP104: 3335 /* cannot handle IV generation in fast-xmit */ 3336 if (gen_iv) 3337 goto out; 3338 if (iv_spc) 3339 build.hdr_len += IEEE80211_WEP_IV_LEN; 3340 break; 3341 case WLAN_CIPHER_SUITE_AES_CMAC: 3342 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3343 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3344 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3345 WARN(1, 3346 "management cipher suite 0x%x enabled for data\n", 3347 build.key->conf.cipher); 3348 goto out; 3349 default: 3350 /* we don't know how to generate IVs for this at all */ 3351 if (WARN_ON(gen_iv)) 3352 goto out; 3353 } 3354 3355 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3356 } 3357 3358 hdr->frame_control = fc; 3359 3360 memcpy(build.hdr + build.hdr_len, 3361 rfc1042_header, sizeof(rfc1042_header)); 3362 build.hdr_len += sizeof(rfc1042_header); 3363 3364 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3365 /* if the kmemdup fails, continue w/o fast_tx */ 3366 3367 out: 3368 /* we might have raced against another call to this function */ 3369 old = rcu_dereference_protected(sta->fast_tx, 3370 lockdep_is_held(&sta->lock)); 3371 rcu_assign_pointer(sta->fast_tx, fast_tx); 3372 if (old) 3373 kfree_rcu(old, rcu_head); 3374 spin_unlock_bh(&sta->lock); 3375 } 3376 3377 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3378 { 3379 struct sta_info *sta; 3380 3381 rcu_read_lock(); 3382 list_for_each_entry_rcu(sta, &local->sta_list, list) 3383 ieee80211_check_fast_xmit(sta); 3384 rcu_read_unlock(); 3385 } 3386 3387 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3388 { 3389 struct ieee80211_local *local = sdata->local; 3390 struct sta_info *sta; 3391 3392 rcu_read_lock(); 3393 3394 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3395 if (sdata != sta->sdata && 3396 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3397 continue; 3398 ieee80211_check_fast_xmit(sta); 3399 } 3400 3401 rcu_read_unlock(); 3402 } 3403 3404 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3405 { 3406 struct ieee80211_fast_tx *fast_tx; 3407 3408 spin_lock_bh(&sta->lock); 3409 fast_tx = rcu_dereference_protected(sta->fast_tx, 3410 lockdep_is_held(&sta->lock)); 3411 RCU_INIT_POINTER(sta->fast_tx, NULL); 3412 spin_unlock_bh(&sta->lock); 3413 3414 if (fast_tx) 3415 kfree_rcu(fast_tx, rcu_head); 3416 } 3417 3418 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3419 struct sk_buff *skb, int headroom) 3420 { 3421 if (skb_headroom(skb) < headroom) { 3422 I802_DEBUG_INC(local->tx_expand_skb_head); 3423 3424 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3425 wiphy_debug(local->hw.wiphy, 3426 "failed to reallocate TX buffer\n"); 3427 return false; 3428 } 3429 } 3430 3431 return true; 3432 } 3433 3434 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3435 struct ieee80211_fast_tx *fast_tx, 3436 struct sk_buff *skb) 3437 { 3438 struct ieee80211_local *local = sdata->local; 3439 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3440 struct ieee80211_hdr *hdr; 3441 struct ethhdr *amsdu_hdr; 3442 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3443 int subframe_len = skb->len - hdr_len; 3444 void *data; 3445 u8 *qc, *h_80211_src, *h_80211_dst; 3446 const u8 *bssid; 3447 3448 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3449 return false; 3450 3451 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3452 return true; 3453 3454 if (!ieee80211_amsdu_realloc_pad(local, skb, 3455 sizeof(*amsdu_hdr) + 3456 local->hw.extra_tx_headroom)) 3457 return false; 3458 3459 data = skb_push(skb, sizeof(*amsdu_hdr)); 3460 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3461 hdr = data; 3462 amsdu_hdr = data + hdr_len; 3463 /* h_80211_src/dst is addr* field within hdr */ 3464 h_80211_src = data + fast_tx->sa_offs; 3465 h_80211_dst = data + fast_tx->da_offs; 3466 3467 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3468 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3469 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3470 3471 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3472 * fields needs to be changed to BSSID for A-MSDU frames depending 3473 * on FromDS/ToDS values. 3474 */ 3475 switch (sdata->vif.type) { 3476 case NL80211_IFTYPE_STATION: 3477 bssid = sdata->vif.cfg.ap_addr; 3478 break; 3479 case NL80211_IFTYPE_AP: 3480 case NL80211_IFTYPE_AP_VLAN: 3481 bssid = sdata->vif.addr; 3482 break; 3483 default: 3484 bssid = NULL; 3485 } 3486 3487 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3488 ether_addr_copy(h_80211_src, bssid); 3489 3490 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3491 ether_addr_copy(h_80211_dst, bssid); 3492 3493 qc = ieee80211_get_qos_ctl(hdr); 3494 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3495 3496 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3497 3498 return true; 3499 } 3500 3501 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3502 struct sta_info *sta, 3503 struct ieee80211_fast_tx *fast_tx, 3504 struct sk_buff *skb, 3505 const u8 *da, const u8 *sa) 3506 { 3507 struct ieee80211_local *local = sdata->local; 3508 struct fq *fq = &local->fq; 3509 struct fq_tin *tin; 3510 struct fq_flow *flow; 3511 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3512 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3513 struct txq_info *txqi; 3514 struct sk_buff **frag_tail, *head; 3515 int subframe_len = skb->len - ETH_ALEN; 3516 u8 max_subframes = sta->sta.max_amsdu_subframes; 3517 int max_frags = local->hw.max_tx_fragments; 3518 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3519 int orig_truesize; 3520 u32 flow_idx; 3521 __be16 len; 3522 void *data; 3523 bool ret = false; 3524 unsigned int orig_len; 3525 int n = 2, nfrags, pad = 0; 3526 u16 hdrlen; 3527 3528 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3529 return false; 3530 3531 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3532 return false; 3533 3534 if (ieee80211_vif_is_mesh(&sdata->vif)) 3535 return false; 3536 3537 if (skb_is_gso(skb)) 3538 return false; 3539 3540 if (!txq) 3541 return false; 3542 3543 txqi = to_txq_info(txq); 3544 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3545 return false; 3546 3547 if (sta->sta.cur->max_rc_amsdu_len) 3548 max_amsdu_len = min_t(int, max_amsdu_len, 3549 sta->sta.cur->max_rc_amsdu_len); 3550 3551 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3552 max_amsdu_len = min_t(int, max_amsdu_len, 3553 sta->sta.cur->max_tid_amsdu_len[tid]); 3554 3555 flow_idx = fq_flow_idx(fq, skb); 3556 3557 spin_lock_bh(&fq->lock); 3558 3559 /* TODO: Ideally aggregation should be done on dequeue to remain 3560 * responsive to environment changes. 3561 */ 3562 3563 tin = &txqi->tin; 3564 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3565 head = skb_peek_tail(&flow->queue); 3566 if (!head || skb_is_gso(head)) 3567 goto out; 3568 3569 orig_truesize = head->truesize; 3570 orig_len = head->len; 3571 3572 if (skb->len + head->len > max_amsdu_len) 3573 goto out; 3574 3575 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3576 nfrags += 1 + skb_shinfo(head)->nr_frags; 3577 frag_tail = &skb_shinfo(head)->frag_list; 3578 while (*frag_tail) { 3579 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3580 frag_tail = &(*frag_tail)->next; 3581 n++; 3582 } 3583 3584 if (max_subframes && n > max_subframes) 3585 goto out; 3586 3587 if (max_frags && nfrags > max_frags) 3588 goto out; 3589 3590 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3591 goto out; 3592 3593 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3594 goto out; 3595 3596 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3597 * and frag_tail should be &skb_shinfo(head)->frag_list. 3598 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3599 * Reload frag_tail to have it pointing to the correct place. 3600 */ 3601 if (n == 2) 3602 frag_tail = &skb_shinfo(head)->frag_list; 3603 3604 /* 3605 * Pad out the previous subframe to a multiple of 4 by adding the 3606 * padding to the next one, that's being added. Note that head->len 3607 * is the length of the full A-MSDU, but that works since each time 3608 * we add a new subframe we pad out the previous one to a multiple 3609 * of 4 and thus it no longer matters in the next round. 3610 */ 3611 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3612 if ((head->len - hdrlen) & 3) 3613 pad = 4 - ((head->len - hdrlen) & 3); 3614 3615 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3616 2 + pad)) 3617 goto out_recalc; 3618 3619 ret = true; 3620 data = skb_push(skb, ETH_ALEN + 2); 3621 ether_addr_copy(data, da); 3622 ether_addr_copy(data + ETH_ALEN, sa); 3623 3624 data += 2 * ETH_ALEN; 3625 len = cpu_to_be16(subframe_len); 3626 memcpy(data, &len, 2); 3627 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3628 3629 memset(skb_push(skb, pad), 0, pad); 3630 3631 head->len += skb->len; 3632 head->data_len += skb->len; 3633 *frag_tail = skb; 3634 3635 out_recalc: 3636 fq->memory_usage += head->truesize - orig_truesize; 3637 if (head->len != orig_len) { 3638 flow->backlog += head->len - orig_len; 3639 tin->backlog_bytes += head->len - orig_len; 3640 } 3641 out: 3642 spin_unlock_bh(&fq->lock); 3643 3644 return ret; 3645 } 3646 3647 /* 3648 * Can be called while the sta lock is held. Anything that can cause packets to 3649 * be generated will cause deadlock! 3650 */ 3651 static ieee80211_tx_result 3652 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3653 struct sta_info *sta, u8 pn_offs, 3654 struct ieee80211_key *key, 3655 struct ieee80211_tx_data *tx) 3656 { 3657 struct sk_buff *skb = tx->skb; 3658 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3659 struct ieee80211_hdr *hdr = (void *)skb->data; 3660 u8 tid = IEEE80211_NUM_TIDS; 3661 3662 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3663 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3664 return TX_DROP; 3665 3666 if (key) 3667 info->control.hw_key = &key->conf; 3668 3669 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3670 3671 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3672 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3673 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3674 } else { 3675 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3676 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3677 sdata->sequence_number += 0x10; 3678 } 3679 3680 if (skb_shinfo(skb)->gso_size) 3681 sta->deflink.tx_stats.msdu[tid] += 3682 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3683 else 3684 sta->deflink.tx_stats.msdu[tid]++; 3685 3686 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3687 3688 /* statistics normally done by ieee80211_tx_h_stats (but that 3689 * has to consider fragmentation, so is more complex) 3690 */ 3691 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3692 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3693 3694 if (pn_offs) { 3695 u64 pn; 3696 u8 *crypto_hdr = skb->data + pn_offs; 3697 3698 switch (key->conf.cipher) { 3699 case WLAN_CIPHER_SUITE_CCMP: 3700 case WLAN_CIPHER_SUITE_CCMP_256: 3701 case WLAN_CIPHER_SUITE_GCMP: 3702 case WLAN_CIPHER_SUITE_GCMP_256: 3703 pn = atomic64_inc_return(&key->conf.tx_pn); 3704 crypto_hdr[0] = pn; 3705 crypto_hdr[1] = pn >> 8; 3706 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3707 crypto_hdr[4] = pn >> 16; 3708 crypto_hdr[5] = pn >> 24; 3709 crypto_hdr[6] = pn >> 32; 3710 crypto_hdr[7] = pn >> 40; 3711 break; 3712 } 3713 } 3714 3715 return TX_CONTINUE; 3716 } 3717 3718 static netdev_features_t 3719 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3720 { 3721 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3722 return sdata->vif.netdev_features; 3723 3724 if (!sdata->bss) 3725 return 0; 3726 3727 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3728 return sdata->vif.netdev_features; 3729 } 3730 3731 static struct sk_buff * 3732 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3733 { 3734 if (skb_is_gso(skb)) { 3735 struct sk_buff *segs; 3736 3737 segs = skb_gso_segment(skb, features); 3738 if (!segs) 3739 return skb; 3740 if (IS_ERR(segs)) 3741 goto free; 3742 3743 consume_skb(skb); 3744 return segs; 3745 } 3746 3747 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3748 goto free; 3749 3750 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3751 int ofs = skb_checksum_start_offset(skb); 3752 3753 if (skb->encapsulation) 3754 skb_set_inner_transport_header(skb, ofs); 3755 else 3756 skb_set_transport_header(skb, ofs); 3757 3758 if (skb_csum_hwoffload_help(skb, features)) 3759 goto free; 3760 } 3761 3762 skb_mark_not_on_list(skb); 3763 return skb; 3764 3765 free: 3766 kfree_skb(skb); 3767 return NULL; 3768 } 3769 3770 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3771 struct sta_info *sta, 3772 struct ieee80211_fast_tx *fast_tx, 3773 struct sk_buff *skb, bool ampdu, 3774 const u8 *da, const u8 *sa) 3775 { 3776 struct ieee80211_local *local = sdata->local; 3777 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3778 struct ieee80211_tx_info *info; 3779 struct ieee80211_tx_data tx; 3780 ieee80211_tx_result r; 3781 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3782 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3783 3784 skb = skb_share_check(skb, GFP_ATOMIC); 3785 if (unlikely(!skb)) 3786 return; 3787 3788 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3789 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3790 return; 3791 3792 /* will not be crypto-handled beyond what we do here, so use false 3793 * as the may-encrypt argument for the resize to not account for 3794 * more room than we already have in 'extra_head' 3795 */ 3796 if (unlikely(ieee80211_skb_resize(sdata, skb, 3797 max_t(int, extra_head + hw_headroom - 3798 skb_headroom(skb), 0), 3799 ENCRYPT_NO))) 3800 goto free; 3801 3802 hdr = skb_push(skb, extra_head); 3803 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3804 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3805 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3806 3807 info = IEEE80211_SKB_CB(skb); 3808 memset(info, 0, sizeof(*info)); 3809 info->band = fast_tx->band; 3810 info->control.vif = &sdata->vif; 3811 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3812 IEEE80211_TX_CTL_DONTFRAG; 3813 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3814 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3815 IEEE80211_TX_CTRL_MLO_LINK); 3816 3817 #ifdef CONFIG_MAC80211_DEBUGFS 3818 if (local->force_tx_status) 3819 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3820 #endif 3821 3822 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3823 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3824 3825 *ieee80211_get_qos_ctl(hdr) = tid; 3826 } 3827 3828 __skb_queue_head_init(&tx.skbs); 3829 3830 tx.flags = IEEE80211_TX_UNICAST; 3831 tx.local = local; 3832 tx.sdata = sdata; 3833 tx.sta = sta; 3834 tx.key = fast_tx->key; 3835 3836 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3837 return; 3838 3839 tx.skb = skb; 3840 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3841 fast_tx->key, &tx); 3842 tx.skb = NULL; 3843 if (r == TX_DROP) { 3844 tx.sdata->tx_handlers_drop++; 3845 goto free; 3846 } 3847 3848 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3849 sdata = container_of(sdata->bss, 3850 struct ieee80211_sub_if_data, u.ap); 3851 3852 __skb_queue_tail(&tx.skbs, skb); 3853 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3854 return; 3855 3856 free: 3857 kfree_skb(skb); 3858 } 3859 3860 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3861 struct sta_info *sta, 3862 struct ieee80211_fast_tx *fast_tx, 3863 struct sk_buff *skb) 3864 { 3865 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3866 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3867 struct tid_ampdu_tx *tid_tx = NULL; 3868 struct sk_buff *next; 3869 struct ethhdr eth; 3870 u8 tid = IEEE80211_NUM_TIDS; 3871 3872 /* control port protocol needs a lot of special handling */ 3873 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3874 return false; 3875 3876 /* only RFC 1042 SNAP */ 3877 if (ethertype < ETH_P_802_3_MIN) 3878 return false; 3879 3880 /* don't handle TX status request here either */ 3881 if (sk_requests_wifi_status(skb->sk)) 3882 return false; 3883 3884 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3885 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3886 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3887 if (tid_tx) { 3888 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3889 return false; 3890 if (tid_tx->timeout) 3891 tid_tx->last_tx = jiffies; 3892 } 3893 } 3894 3895 memcpy(ð, skb->data, ETH_HLEN - 2); 3896 3897 /* after this point (skb is modified) we cannot return false */ 3898 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3899 if (!skb) 3900 return true; 3901 3902 skb_list_walk_safe(skb, skb, next) { 3903 skb_mark_not_on_list(skb); 3904 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3905 eth.h_dest, eth.h_source); 3906 } 3907 3908 return true; 3909 } 3910 3911 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3912 struct ieee80211_txq *txq) 3913 { 3914 struct ieee80211_local *local = hw_to_local(hw); 3915 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3916 struct ieee80211_hdr *hdr; 3917 struct sk_buff *skb = NULL; 3918 struct fq *fq = &local->fq; 3919 struct fq_tin *tin = &txqi->tin; 3920 struct ieee80211_tx_info *info; 3921 struct ieee80211_tx_data tx; 3922 ieee80211_tx_result r; 3923 struct ieee80211_vif *vif = txq->vif; 3924 int q = vif->hw_queue[txq->ac]; 3925 unsigned long flags; 3926 bool q_stopped; 3927 3928 WARN_ON_ONCE(softirq_count() == 0); 3929 3930 if (!ieee80211_txq_airtime_check(hw, txq)) 3931 return NULL; 3932 3933 begin: 3934 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3935 q_stopped = local->queue_stop_reasons[q]; 3936 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3937 3938 if (unlikely(q_stopped)) { 3939 /* mark for waking later */ 3940 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3941 return NULL; 3942 } 3943 3944 spin_lock_bh(&fq->lock); 3945 3946 /* Make sure fragments stay together. */ 3947 skb = __skb_dequeue(&txqi->frags); 3948 if (unlikely(skb)) { 3949 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3950 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3951 goto out; 3952 IEEE80211_SKB_CB(skb)->control.flags &= 3953 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3954 } else { 3955 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3956 goto out; 3957 3958 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3959 } 3960 3961 if (!skb) 3962 goto out; 3963 3964 spin_unlock_bh(&fq->lock); 3965 3966 hdr = (struct ieee80211_hdr *)skb->data; 3967 info = IEEE80211_SKB_CB(skb); 3968 3969 memset(&tx, 0, sizeof(tx)); 3970 __skb_queue_head_init(&tx.skbs); 3971 tx.local = local; 3972 tx.skb = skb; 3973 tx.sdata = vif_to_sdata(info->control.vif); 3974 3975 if (txq->sta) { 3976 tx.sta = container_of(txq->sta, struct sta_info, sta); 3977 /* 3978 * Drop unicast frames to unauthorised stations unless they are 3979 * injected frames or EAPOL frames from the local station. 3980 */ 3981 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3982 ieee80211_is_data_present(hdr->frame_control) && 3983 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3984 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3985 !is_multicast_ether_addr(hdr->addr1) && 3986 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3987 (!(info->control.flags & 3988 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3989 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3990 NULL)))) { 3991 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3992 ieee80211_free_txskb(&local->hw, skb); 3993 goto begin; 3994 } 3995 } 3996 3997 /* 3998 * The key can be removed while the packet was queued, so need to call 3999 * this here to get the current key. 4000 */ 4001 info->control.hw_key = NULL; 4002 r = ieee80211_tx_h_select_key(&tx); 4003 if (r != TX_CONTINUE) { 4004 ieee80211_free_txskb(&local->hw, skb); 4005 goto begin; 4006 } 4007 4008 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 4009 info->flags |= (IEEE80211_TX_CTL_AMPDU | 4010 IEEE80211_TX_CTL_DONTFRAG); 4011 4012 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4013 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 4014 r = ieee80211_tx_h_rate_ctrl(&tx); 4015 if (r != TX_CONTINUE) { 4016 ieee80211_free_txskb(&local->hw, skb); 4017 goto begin; 4018 } 4019 } 4020 goto encap_out; 4021 } 4022 4023 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 4024 struct sta_info *sta = container_of(txq->sta, struct sta_info, 4025 sta); 4026 u8 pn_offs = 0; 4027 4028 if (tx.key && 4029 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 4030 pn_offs = ieee80211_hdrlen(hdr->frame_control); 4031 4032 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 4033 tx.key, &tx); 4034 if (r != TX_CONTINUE) { 4035 ieee80211_free_txskb(&local->hw, skb); 4036 goto begin; 4037 } 4038 } else { 4039 if (invoke_tx_handlers_late(&tx)) 4040 goto begin; 4041 4042 skb = __skb_dequeue(&tx.skbs); 4043 info = IEEE80211_SKB_CB(skb); 4044 4045 if (!skb_queue_empty(&tx.skbs)) { 4046 spin_lock_bh(&fq->lock); 4047 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 4048 spin_unlock_bh(&fq->lock); 4049 } 4050 } 4051 4052 if (skb_has_frag_list(skb) && 4053 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 4054 if (skb_linearize(skb)) { 4055 ieee80211_free_txskb(&local->hw, skb); 4056 goto begin; 4057 } 4058 } 4059 4060 switch (tx.sdata->vif.type) { 4061 case NL80211_IFTYPE_MONITOR: 4062 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 4063 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 4064 vif = &tx.sdata->vif; 4065 break; 4066 } 4067 tx.sdata = rcu_dereference(local->monitor_sdata); 4068 if (tx.sdata && 4069 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 4070 vif = &tx.sdata->vif; 4071 info->hw_queue = 4072 vif->hw_queue[skb_get_queue_mapping(skb)]; 4073 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 4074 ieee80211_free_txskb(&local->hw, skb); 4075 goto begin; 4076 } else { 4077 info->control.vif = NULL; 4078 return skb; 4079 } 4080 break; 4081 case NL80211_IFTYPE_AP_VLAN: 4082 tx.sdata = container_of(tx.sdata->bss, 4083 struct ieee80211_sub_if_data, u.ap); 4084 fallthrough; 4085 default: 4086 vif = &tx.sdata->vif; 4087 break; 4088 } 4089 4090 encap_out: 4091 info->control.vif = vif; 4092 4093 if (wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 4094 bool ampdu = txq->sta && txq->ac != IEEE80211_AC_VO; 4095 u32 airtime; 4096 4097 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 4098 skb->len, ampdu); 4099 if (!airtime) 4100 return skb; 4101 4102 airtime = ieee80211_info_set_tx_time_est(info, airtime); 4103 info->tx_time_mc = !tx.sta; 4104 ieee80211_sta_update_pending_airtime(local, tx.sta, txq->ac, 4105 airtime, false, 4106 info->tx_time_mc); 4107 } 4108 4109 return skb; 4110 4111 out: 4112 spin_unlock_bh(&fq->lock); 4113 4114 return skb; 4115 } 4116 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4117 4118 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4119 { 4120 struct airtime_info *air_info = &sta->airtime[ac]; 4121 4122 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4123 } 4124 4125 static void 4126 ieee80211_txq_set_active(struct txq_info *txqi) 4127 { 4128 struct sta_info *sta; 4129 4130 if (!txqi->txq.sta) 4131 return; 4132 4133 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4134 sta->airtime[txqi->txq.ac].last_active = jiffies; 4135 } 4136 4137 static bool 4138 ieee80211_txq_keep_active(struct txq_info *txqi) 4139 { 4140 struct sta_info *sta; 4141 4142 if (!txqi->txq.sta) 4143 return false; 4144 4145 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4146 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4147 return false; 4148 4149 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4150 } 4151 4152 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4153 { 4154 struct ieee80211_local *local = hw_to_local(hw); 4155 struct ieee80211_txq *ret = NULL; 4156 struct txq_info *txqi = NULL, *head = NULL; 4157 bool found_eligible_txq = false; 4158 bool aql_check; 4159 4160 spin_lock_bh(&local->active_txq_lock[ac]); 4161 4162 if (!local->schedule_round[ac]) 4163 goto out; 4164 4165 begin: 4166 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4167 struct txq_info, 4168 schedule_order); 4169 if (!txqi) 4170 goto out; 4171 4172 if (txqi == head) { 4173 if (!found_eligible_txq) 4174 goto out; 4175 else 4176 found_eligible_txq = false; 4177 } 4178 4179 if (!head) 4180 head = txqi; 4181 4182 aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4183 if (aql_check) 4184 found_eligible_txq = true; 4185 4186 if (txqi->txq.sta) { 4187 struct sta_info *sta = container_of(txqi->txq.sta, 4188 struct sta_info, sta); 4189 4190 if (ieee80211_sta_deficit(sta, txqi->txq.ac) < 0) { 4191 sta->airtime[txqi->txq.ac].deficit += 4192 sta->airtime_weight; 4193 4194 aql_check = false; 4195 } 4196 } 4197 4198 if (!aql_check) { 4199 list_move_tail(&txqi->schedule_order, 4200 &local->active_txqs[txqi->txq.ac]); 4201 goto begin; 4202 } 4203 4204 if (txqi->schedule_round == local->schedule_round[ac]) 4205 goto out; 4206 4207 list_del_init(&txqi->schedule_order); 4208 txqi->schedule_round = local->schedule_round[ac]; 4209 ret = &txqi->txq; 4210 4211 out: 4212 spin_unlock_bh(&local->active_txq_lock[ac]); 4213 return ret; 4214 } 4215 EXPORT_SYMBOL(ieee80211_next_txq); 4216 4217 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4218 struct ieee80211_txq *txq, 4219 bool force) 4220 { 4221 struct ieee80211_local *local = hw_to_local(hw); 4222 struct txq_info *txqi = to_txq_info(txq); 4223 bool has_queue; 4224 4225 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4226 4227 has_queue = force || 4228 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4229 txq_has_queue(txq)); 4230 if (list_empty(&txqi->schedule_order) && 4231 (has_queue || ieee80211_txq_keep_active(txqi))) { 4232 /* If airtime accounting is active, always enqueue STAs at the 4233 * head of the list to ensure that they only get moved to the 4234 * back by the airtime DRR scheduler once they have a negative 4235 * deficit. A station that already has a negative deficit will 4236 * get immediately moved to the back of the list on the next 4237 * call to ieee80211_next_txq(). 4238 */ 4239 if (txqi->txq.sta && local->airtime_flags && has_queue && 4240 wiphy_ext_feature_isset(local->hw.wiphy, 4241 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4242 list_add(&txqi->schedule_order, 4243 &local->active_txqs[txq->ac]); 4244 else 4245 list_add_tail(&txqi->schedule_order, 4246 &local->active_txqs[txq->ac]); 4247 if (has_queue) 4248 ieee80211_txq_set_active(txqi); 4249 } 4250 4251 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4252 } 4253 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4254 4255 DEFINE_STATIC_KEY_FALSE(aql_disable); 4256 4257 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4258 struct ieee80211_txq *txq) 4259 { 4260 struct sta_info *sta; 4261 struct ieee80211_local *local = hw_to_local(hw); 4262 4263 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4264 return true; 4265 4266 if (static_branch_unlikely(&aql_disable)) 4267 return true; 4268 4269 if (!txq->sta) 4270 return atomic_read(&local->aql_mc_pending_airtime) < 4271 local->aql_txq_limit_mc; 4272 4273 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4274 return true; 4275 4276 sta = container_of(txq->sta, struct sta_info, sta); 4277 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4278 sta->airtime[txq->ac].aql_limit_low) 4279 return true; 4280 4281 if (atomic_read(&local->aql_total_pending_airtime) < 4282 local->aql_threshold && 4283 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4284 sta->airtime[txq->ac].aql_limit_high) 4285 return true; 4286 4287 return false; 4288 } 4289 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4290 4291 u32 ieee80211_txq_aql_pending(struct ieee80211_hw *hw, 4292 struct ieee80211_txq *txq) 4293 { 4294 struct ieee80211_local *local = hw_to_local(hw); 4295 struct sta_info *sta; 4296 4297 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4298 return 0; 4299 4300 if (!txq->sta) 4301 return atomic_read(&local->aql_mc_pending_airtime); 4302 4303 sta = container_of(txq->sta, struct sta_info, sta); 4304 4305 return atomic_read(&sta->airtime[txq->ac].aql_tx_pending); 4306 } 4307 EXPORT_SYMBOL(ieee80211_txq_aql_pending); 4308 4309 static bool 4310 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4311 { 4312 unsigned int num_txq = 0; 4313 struct txq_info *txq; 4314 u32 aql_limit; 4315 4316 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4317 return true; 4318 4319 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4320 num_txq++; 4321 4322 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4323 local->aql_txq_limit_high[ac]; 4324 4325 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4326 } 4327 4328 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4329 struct ieee80211_txq *txq) 4330 { 4331 struct ieee80211_local *local = hw_to_local(hw); 4332 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4333 struct sta_info *sta; 4334 u8 ac = txq->ac; 4335 4336 spin_lock_bh(&local->active_txq_lock[ac]); 4337 4338 if (list_empty(&txqi->schedule_order)) 4339 goto out; 4340 4341 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4342 goto out; 4343 4344 if (!txqi->txq.sta) 4345 goto out; 4346 4347 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4348 schedule_order) { 4349 if (iter == txqi) 4350 break; 4351 4352 if (!iter->txq.sta) { 4353 list_move_tail(&iter->schedule_order, 4354 &local->active_txqs[ac]); 4355 continue; 4356 } 4357 sta = container_of(iter->txq.sta, struct sta_info, sta); 4358 if (ieee80211_sta_deficit(sta, ac) < 0) 4359 sta->airtime[ac].deficit += sta->airtime_weight; 4360 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4361 } 4362 4363 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4364 if (sta->airtime[ac].deficit >= 0) 4365 goto out; 4366 4367 sta->airtime[ac].deficit += sta->airtime_weight; 4368 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4369 spin_unlock_bh(&local->active_txq_lock[ac]); 4370 4371 return false; 4372 out: 4373 if (!list_empty(&txqi->schedule_order)) 4374 list_del_init(&txqi->schedule_order); 4375 spin_unlock_bh(&local->active_txq_lock[ac]); 4376 4377 return true; 4378 } 4379 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4380 4381 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4382 { 4383 struct ieee80211_local *local = hw_to_local(hw); 4384 4385 spin_lock_bh(&local->active_txq_lock[ac]); 4386 4387 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4388 local->schedule_round[ac]++; 4389 if (!local->schedule_round[ac]) 4390 local->schedule_round[ac]++; 4391 } else { 4392 local->schedule_round[ac] = 0; 4393 } 4394 4395 spin_unlock_bh(&local->active_txq_lock[ac]); 4396 } 4397 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4398 4399 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4400 struct net_device *dev, 4401 u32 info_flags, 4402 u32 ctrl_flags, 4403 u64 cookie) 4404 { 4405 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4406 struct ieee80211_local *local = sdata->local; 4407 struct sta_info *sta; 4408 struct sk_buff *next; 4409 int len = skb->len; 4410 4411 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4412 kfree_skb(skb); 4413 return; 4414 } 4415 4416 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4417 4418 rcu_read_lock(); 4419 4420 if (ieee80211_vif_is_mesh(&sdata->vif) && 4421 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4422 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4423 goto out; 4424 4425 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, 4426 skb->protocol == sdata->control_port_protocol)) 4427 goto out_free; 4428 4429 if (IS_ERR(sta)) 4430 sta = NULL; 4431 4432 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4433 ieee80211_aggr_check(sdata, sta, skb); 4434 4435 if (sta) { 4436 struct ieee80211_fast_tx *fast_tx; 4437 4438 fast_tx = rcu_dereference(sta->fast_tx); 4439 4440 if (fast_tx && 4441 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4442 goto out; 4443 } 4444 4445 /* the frame could be fragmented, software-encrypted, and other 4446 * things so we cannot really handle checksum or GSO offload. 4447 * fix it up in software before we handle anything else. 4448 */ 4449 skb = ieee80211_tx_skb_fixup(skb, 0); 4450 if (!skb) { 4451 len = 0; 4452 goto out; 4453 } 4454 4455 skb_list_walk_safe(skb, skb, next) { 4456 skb_mark_not_on_list(skb); 4457 4458 if (skb->protocol == sdata->control_port_protocol) 4459 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4460 4461 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4462 sta, ctrl_flags, cookie); 4463 if (IS_ERR(skb)) { 4464 kfree_skb_list(next); 4465 goto out; 4466 } 4467 4468 dev_sw_netstats_tx_add(dev, 1, skb->len); 4469 4470 ieee80211_xmit(sdata, sta, skb); 4471 } 4472 goto out; 4473 out_free: 4474 kfree_skb(skb); 4475 len = 0; 4476 out: 4477 if (len) 4478 ieee80211_tpt_led_trig_tx(local, len); 4479 rcu_read_unlock(); 4480 } 4481 4482 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4483 { 4484 struct ethhdr *eth; 4485 int err; 4486 4487 err = skb_ensure_writable(skb, ETH_HLEN); 4488 if (unlikely(err)) 4489 return err; 4490 4491 eth = (void *)skb->data; 4492 ether_addr_copy(eth->h_dest, sta->sta.addr); 4493 4494 return 0; 4495 } 4496 4497 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4498 struct net_device *dev) 4499 { 4500 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4501 const struct ethhdr *eth = (void *)skb->data; 4502 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4503 __be16 ethertype; 4504 4505 switch (sdata->vif.type) { 4506 case NL80211_IFTYPE_AP_VLAN: 4507 if (sdata->u.vlan.sta) 4508 return false; 4509 if (sdata->wdev.use_4addr) 4510 return false; 4511 fallthrough; 4512 case NL80211_IFTYPE_AP: 4513 /* check runtime toggle for this bss */ 4514 if (!sdata->bss->multicast_to_unicast) 4515 return false; 4516 break; 4517 default: 4518 return false; 4519 } 4520 4521 /* multicast to unicast conversion only for some payload */ 4522 ethertype = eth->h_proto; 4523 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4524 ethertype = ethvlan->h_vlan_encapsulated_proto; 4525 switch (ethertype) { 4526 case htons(ETH_P_ARP): 4527 case htons(ETH_P_IP): 4528 case htons(ETH_P_IPV6): 4529 break; 4530 default: 4531 return false; 4532 } 4533 4534 return true; 4535 } 4536 4537 static void 4538 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4539 struct sk_buff_head *queue) 4540 { 4541 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4542 struct ieee80211_local *local = sdata->local; 4543 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4544 struct sta_info *sta, *first = NULL; 4545 struct sk_buff *cloned_skb; 4546 4547 rcu_read_lock(); 4548 4549 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4550 if (sdata != sta->sdata) 4551 /* AP-VLAN mismatch */ 4552 continue; 4553 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4554 /* do not send back to source */ 4555 continue; 4556 if (!first) { 4557 first = sta; 4558 continue; 4559 } 4560 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4561 if (!cloned_skb) 4562 goto multicast; 4563 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4564 dev_kfree_skb(cloned_skb); 4565 goto multicast; 4566 } 4567 __skb_queue_tail(queue, cloned_skb); 4568 } 4569 4570 if (likely(first)) { 4571 if (unlikely(ieee80211_change_da(skb, first))) 4572 goto multicast; 4573 __skb_queue_tail(queue, skb); 4574 } else { 4575 /* no STA connected, drop */ 4576 kfree_skb(skb); 4577 skb = NULL; 4578 } 4579 4580 goto out; 4581 multicast: 4582 __skb_queue_purge(queue); 4583 __skb_queue_tail(queue, skb); 4584 out: 4585 rcu_read_unlock(); 4586 } 4587 4588 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4589 struct sk_buff *skb, u32 ctrl_flags, 4590 unsigned int link_id) 4591 { 4592 struct sk_buff *out; 4593 4594 out = skb_copy(skb, GFP_ATOMIC); 4595 if (!out) 4596 return; 4597 4598 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4599 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, 0); 4600 } 4601 4602 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4603 struct sk_buff *skb) 4604 { 4605 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4606 unsigned long links = sdata->vif.active_links; 4607 unsigned int link; 4608 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4609 4610 if (hweight16(links) == 1) { 4611 ctrl_flags |= u32_encode_bits(__ffs(links), 4612 IEEE80211_TX_CTRL_MLO_LINK); 4613 4614 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 0); 4615 return; 4616 } 4617 4618 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4619 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4620 ctrl_flags = 0; 4621 } 4622 kfree_skb(skb); 4623 } 4624 4625 /** 4626 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4627 * @skb: packet to be sent 4628 * @dev: incoming interface 4629 * 4630 * On failure skb will be freed. 4631 * 4632 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4633 */ 4634 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4635 struct net_device *dev) 4636 { 4637 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4638 const struct ethhdr *eth = (void *)skb->data; 4639 4640 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4641 goto normal; 4642 4643 if (unlikely(!ieee80211_sdata_running(sdata))) { 4644 kfree_skb(skb); 4645 return NETDEV_TX_OK; 4646 } 4647 4648 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4649 struct sk_buff_head queue; 4650 4651 __skb_queue_head_init(&queue); 4652 ieee80211_convert_to_unicast(skb, dev, &queue); 4653 while ((skb = __skb_dequeue(&queue))) 4654 __ieee80211_subif_start_xmit(skb, dev, 0, 4655 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4656 0); 4657 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4658 ((sdata->vif.type == NL80211_IFTYPE_AP && 4659 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4660 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4661 !sdata->wdev.use_4addr))) { 4662 ieee80211_mlo_multicast_tx(dev, skb); 4663 } else { 4664 normal: 4665 __ieee80211_subif_start_xmit(skb, dev, 0, 4666 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4667 0); 4668 } 4669 4670 return NETDEV_TX_OK; 4671 } 4672 4673 4674 4675 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4676 struct sk_buff *skb, struct sta_info *sta, 4677 bool txpending) 4678 { 4679 struct ieee80211_local *local = sdata->local; 4680 struct ieee80211_tx_control control = {}; 4681 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4682 struct ieee80211_sta *pubsta = NULL; 4683 unsigned long flags; 4684 int q = info->hw_queue; 4685 4686 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4687 4688 if (local->queue_stop_reasons[q] || 4689 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4690 if (txpending) 4691 skb_queue_head(&local->pending[q], skb); 4692 else 4693 skb_queue_tail(&local->pending[q], skb); 4694 4695 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4696 4697 return false; 4698 } 4699 4700 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4701 4702 if (sta && sta->uploaded) 4703 pubsta = &sta->sta; 4704 4705 control.sta = pubsta; 4706 4707 drv_tx(local, &control, skb); 4708 4709 return true; 4710 } 4711 4712 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4713 struct sk_buff *skb, struct sta_info *sta, 4714 bool txpending) 4715 { 4716 struct ieee80211_local *local = sdata->local; 4717 struct sk_buff *next; 4718 bool ret = true; 4719 4720 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4721 return true; 4722 4723 skb_list_walk_safe(skb, skb, next) { 4724 skb_mark_not_on_list(skb); 4725 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4726 ret = false; 4727 } 4728 4729 return ret; 4730 } 4731 4732 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4733 struct net_device *dev, struct sta_info *sta, 4734 struct ieee80211_key *key, struct sk_buff *skb) 4735 { 4736 struct ieee80211_tx_info *info; 4737 struct ieee80211_local *local = sdata->local; 4738 struct ieee80211_chanctx_conf *chanctx_conf; 4739 struct tid_ampdu_tx *tid_tx = NULL; 4740 struct sk_buff *seg, *next; 4741 unsigned int skbs = 0, len = 0; 4742 u16 queue; 4743 u8 tid; 4744 4745 queue = ieee80211_select_queue(sdata, sta, skb); 4746 skb_set_queue_mapping(skb, queue); 4747 4748 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4749 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4750 goto out_free; 4751 4752 skb = skb_share_check(skb, GFP_ATOMIC); 4753 if (unlikely(!skb)) 4754 return; 4755 4756 ieee80211_aggr_check(sdata, sta, skb); 4757 4758 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4759 4760 if (sta) 4761 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4762 if (tid_tx) { 4763 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4764 /* fall back to non-offload slow path */ 4765 __ieee80211_subif_start_xmit(skb, dev, 0, 4766 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4767 0); 4768 return; 4769 } 4770 4771 if (tid_tx->timeout) 4772 tid_tx->last_tx = jiffies; 4773 } 4774 4775 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4776 if (!skb) 4777 return; 4778 4779 info = IEEE80211_SKB_CB(skb); 4780 memset(info, 0, sizeof(*info)); 4781 4782 info->hw_queue = sdata->vif.hw_queue[queue]; 4783 4784 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4785 sdata = container_of(sdata->bss, 4786 struct ieee80211_sub_if_data, u.ap); 4787 4788 /* MLD transmissions must not rely on the band */ 4789 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4790 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4791 if (unlikely(!chanctx_conf)) { 4792 kfree_skb_list(skb); 4793 return; 4794 } 4795 info->band = chanctx_conf->def.chan->band; 4796 } 4797 4798 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4799 info->control.vif = &sdata->vif; 4800 4801 if (key) 4802 info->control.hw_key = &key->conf; 4803 4804 skb_list_walk_safe(skb, seg, next) { 4805 skbs++; 4806 len += seg->len; 4807 if (seg != skb) 4808 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4809 } 4810 4811 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4812 info->status_data = ieee80211_store_ack_skb(local, skb, 4813 &info->flags, 0); 4814 if (info->status_data) 4815 info->status_data_idr = 1; 4816 } 4817 4818 dev_sw_netstats_tx_add(dev, skbs, len); 4819 4820 if (sta) { 4821 sta->deflink.tx_stats.packets[queue] += skbs; 4822 sta->deflink.tx_stats.bytes[queue] += len; 4823 } 4824 4825 ieee80211_tpt_led_trig_tx(local, len); 4826 4827 ieee80211_tx_8023(sdata, skb, sta, false); 4828 4829 return; 4830 4831 out_free: 4832 kfree_skb(skb); 4833 } 4834 4835 static bool ieee80211_check_mcast_offload(struct ieee80211_sub_if_data *sdata, 4836 struct sk_buff *skb) 4837 { 4838 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4839 4840 if ((ieee80211_vif_is_mld(&sdata->vif) && 4841 (sdata->vif.type == NL80211_IFTYPE_AP && 4842 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX))) || 4843 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4844 !sdata->wdev.use_4addr)) 4845 return false; 4846 4847 if (!is_multicast_ether_addr(skb->data) || 4848 !(sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_MCAST) || 4849 sdata->control_port_protocol == ehdr->h_proto) 4850 return false; 4851 4852 return true; 4853 } 4854 4855 static void __ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4856 struct net_device *dev) 4857 { 4858 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4859 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4860 struct ieee80211_link_data *link; 4861 struct ieee80211_key *key; 4862 struct sta_info *sta; 4863 4864 rcu_read_lock(); 4865 4866 if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) 4867 goto skip_offload; 4868 4869 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, false)) { 4870 kfree_skb(skb); 4871 goto out; 4872 } 4873 4874 /* 4875 * If STA is invalid, use the multicast offload path when applicable. 4876 * In AP mode, drop the frame if there are no associated stations; 4877 * otherwise use the default link and multicast key for transmission. 4878 */ 4879 if (unlikely(IS_ERR_OR_NULL(sta) && 4880 ieee80211_check_mcast_offload(sdata, skb))) { 4881 sta = NULL; 4882 if (ieee80211_vif_get_num_mcast_if(sdata) <= 0) { 4883 /* No associated STAs - no need to send multicast frames. */ 4884 kfree_skb(skb); 4885 goto out; 4886 } 4887 link = &sdata->deflink; 4888 key = rcu_dereference(link->default_multicast_key); 4889 } else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4890 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))) { 4891 goto skip_offload; 4892 } else { 4893 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4894 if (!key) 4895 key = rcu_dereference(sdata->default_unicast_key); 4896 } 4897 4898 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4899 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4900 goto skip_offload; 4901 4902 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4903 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4904 goto out; 4905 4906 skip_offload: 4907 ieee80211_subif_start_xmit(skb, dev); 4908 out: 4909 rcu_read_unlock(); 4910 } 4911 4912 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4913 struct net_device *dev) 4914 { 4915 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4916 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4917 4918 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4919 kfree_skb(skb); 4920 return NETDEV_TX_OK; 4921 } 4922 4923 if (unlikely(is_multicast_ether_addr(ehdr->h_dest) && 4924 ieee80211_multicast_to_unicast(skb, dev))) { 4925 struct sk_buff_head queue; 4926 4927 __skb_queue_head_init(&queue); 4928 ieee80211_convert_to_unicast(skb, dev, &queue); 4929 while ((skb = __skb_dequeue(&queue))) 4930 __ieee80211_subif_start_xmit_8023(skb, dev); 4931 } else { 4932 __ieee80211_subif_start_xmit_8023(skb, dev); 4933 } 4934 4935 return NETDEV_TX_OK; 4936 } 4937 4938 struct sk_buff * 4939 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4940 struct sk_buff *skb, u32 info_flags) 4941 { 4942 struct ieee80211_hdr *hdr; 4943 struct ieee80211_tx_data tx = { 4944 .local = sdata->local, 4945 .sdata = sdata, 4946 }; 4947 struct sta_info *sta; 4948 4949 rcu_read_lock(); 4950 4951 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, false)) { 4952 kfree_skb(skb); 4953 skb = ERR_PTR(-EINVAL); 4954 goto out; 4955 } 4956 4957 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4958 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 0); 4959 if (IS_ERR(skb)) 4960 goto out; 4961 4962 hdr = (void *)skb->data; 4963 tx.sta = sta_info_get(sdata, hdr->addr1); 4964 tx.skb = skb; 4965 4966 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4967 rcu_read_unlock(); 4968 kfree_skb(skb); 4969 return ERR_PTR(-EINVAL); 4970 } 4971 4972 out: 4973 rcu_read_unlock(); 4974 return skb; 4975 } 4976 4977 /* 4978 * ieee80211_clear_tx_pending may not be called in a context where 4979 * it is possible that it packets could come in again. 4980 */ 4981 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4982 { 4983 struct sk_buff *skb; 4984 int i; 4985 4986 for (i = 0; i < local->hw.queues; i++) { 4987 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4988 ieee80211_free_txskb(&local->hw, skb); 4989 } 4990 } 4991 4992 /* 4993 * Returns false if the frame couldn't be transmitted but was queued instead, 4994 * which in this case means re-queued -- take as an indication to stop sending 4995 * more pending frames. 4996 */ 4997 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4998 struct sk_buff *skb) 4999 { 5000 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5001 struct ieee80211_sub_if_data *sdata; 5002 struct sta_info *sta; 5003 struct ieee80211_hdr *hdr; 5004 bool result; 5005 struct ieee80211_chanctx_conf *chanctx_conf; 5006 5007 sdata = vif_to_sdata(info->control.vif); 5008 5009 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 5010 /* update band only for non-MLD */ 5011 if (!ieee80211_vif_is_mld(&sdata->vif)) { 5012 chanctx_conf = 5013 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5014 if (unlikely(!chanctx_conf)) { 5015 dev_kfree_skb(skb); 5016 return true; 5017 } 5018 info->band = chanctx_conf->def.chan->band; 5019 } 5020 result = ieee80211_tx(sdata, NULL, skb, true); 5021 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 5022 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, true)) { 5023 dev_kfree_skb(skb); 5024 return true; 5025 } 5026 5027 if (IS_ERR(sta) || (sta && !sta->uploaded)) 5028 sta = NULL; 5029 5030 result = ieee80211_tx_8023(sdata, skb, sta, true); 5031 } else { 5032 struct sk_buff_head skbs; 5033 5034 __skb_queue_head_init(&skbs); 5035 __skb_queue_tail(&skbs, skb); 5036 5037 hdr = (struct ieee80211_hdr *)skb->data; 5038 sta = sta_info_get(sdata, hdr->addr1); 5039 5040 result = __ieee80211_tx(local, &skbs, sta, true); 5041 } 5042 5043 return result; 5044 } 5045 5046 /* 5047 * Transmit all pending packets. Called from tasklet. 5048 */ 5049 void ieee80211_tx_pending(struct tasklet_struct *t) 5050 { 5051 struct ieee80211_local *local = from_tasklet(local, t, 5052 tx_pending_tasklet); 5053 unsigned long flags; 5054 int i; 5055 bool txok; 5056 5057 rcu_read_lock(); 5058 5059 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 5060 for (i = 0; i < local->hw.queues; i++) { 5061 /* 5062 * If queue is stopped by something other than due to pending 5063 * frames, or we have no pending frames, proceed to next queue. 5064 */ 5065 if (local->queue_stop_reasons[i] || 5066 skb_queue_empty(&local->pending[i])) 5067 continue; 5068 5069 while (!skb_queue_empty(&local->pending[i])) { 5070 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 5071 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5072 5073 if (WARN_ON(!info->control.vif)) { 5074 ieee80211_free_txskb(&local->hw, skb); 5075 continue; 5076 } 5077 5078 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 5079 flags); 5080 5081 txok = ieee80211_tx_pending_skb(local, skb); 5082 spin_lock_irqsave(&local->queue_stop_reason_lock, 5083 flags); 5084 if (!txok) 5085 break; 5086 } 5087 } 5088 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 5089 5090 rcu_read_unlock(); 5091 } 5092 5093 /* functions for drivers to get certain frames */ 5094 5095 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 5096 struct sk_buff *skb, 5097 bool mcast_traffic) 5098 { 5099 int i, n1 = 0, n2; 5100 5101 /* 5102 * Find largest even number N1 so that bits numbered 1 through 5103 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 5104 * (N2 + 1) x 8 through 2007 are 0. 5105 */ 5106 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 5107 if (ps->tim[i]) { 5108 n1 = i & 0xfe; 5109 break; 5110 } 5111 } 5112 n2 = n1; 5113 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 5114 if (ps->tim[i]) { 5115 n2 = i; 5116 break; 5117 } 5118 } 5119 5120 /* Bitmap control */ 5121 skb_put_u8(skb, n1 | mcast_traffic); 5122 /* Part Virt Bitmap */ 5123 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 5124 } 5125 5126 /* 5127 * mac80211 currently supports encoding using block bitmap mode, non 5128 * inversed. The current implementation supports up to 1600 AIDs. 5129 * 5130 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 5131 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 5132 * describes 8 AIDs and the presence of a subblock is determined by 5133 * the block bitmap. 5134 */ 5135 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 5136 struct sk_buff *skb, 5137 bool mcast_traffic, 5138 bool ucast_traffic) 5139 { 5140 int blk; 5141 5142 /* 5143 * if no unicast and multicast traffic don't emit a bitmap control 5144 * or pvb 5145 */ 5146 if (!mcast_traffic && !ucast_traffic) 5147 return; 5148 5149 /* 5150 * Emit a bitmap control block with a page slice number of 31 and a 5151 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 5152 * that the entire page (2048 bits) indicated by the page index 5153 * is encoded in the partial virtual bitmap. 5154 */ 5155 skb_put_u8(skb, mcast_traffic | (31 << 1)); 5156 5157 /* If there's no unicast traffic we don't need to include a PVB. */ 5158 if (!ucast_traffic) 5159 return; 5160 5161 /* Emit an encoded block for each non-zero sub-block */ 5162 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 5163 u8 blk_bmap = 0; 5164 int sblk; 5165 5166 for (sblk = 0; sblk < 8; sblk++) { 5167 int sblk_idx = blk * 8 + sblk; 5168 5169 /* 5170 * If the current subblock is non-zero, increase the 5171 * number of subblocks to emit for the current block. 5172 */ 5173 if (ps->tim[sblk_idx]) 5174 blk_bmap |= BIT(sblk); 5175 } 5176 5177 /* If the current block contains no non-zero sublocks */ 5178 if (!blk_bmap) 5179 continue; 5180 5181 /* 5182 * Emit a block control byte for the current encoded block 5183 * with an encoding mode of block bitmap (0x0), not inverse 5184 * (0x0) and the current block offset (5 bits) 5185 */ 5186 skb_put_u8(skb, blk << 3); 5187 5188 /* 5189 * Emit the block bitmap for the current encoded block which 5190 * contains the present subblocks. 5191 */ 5192 skb_put_u8(skb, blk_bmap); 5193 5194 /* Emit the present subblocks */ 5195 for (sblk = 0; sblk < 8; sblk++) { 5196 int sblk_idx = blk * 8 + sblk; 5197 5198 if (!(blk_bmap & BIT(sblk))) 5199 continue; 5200 5201 skb_put_u8(skb, ps->tim[sblk_idx]); 5202 } 5203 } 5204 } 5205 5206 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5207 struct ieee80211_link_data *link, 5208 struct ps_data *ps, struct sk_buff *skb, 5209 bool is_template) 5210 { 5211 struct element *tim; 5212 bool mcast_traffic = false, have_bits = false; 5213 struct ieee80211_bss_conf *link_conf = link->conf; 5214 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5215 5216 /* Generate bitmap for TIM only if there are any STAs in power save 5217 * mode. */ 5218 if (atomic_read(&ps->num_sta_ps) > 0) 5219 /* in the hope that this is faster than 5220 * checking byte-for-byte */ 5221 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5222 IEEE80211_MAX_AID + 1); 5223 5224 if (!is_template) { 5225 if (ps->dtim_count == 0) 5226 ps->dtim_count = link_conf->dtim_period - 1; 5227 else 5228 ps->dtim_count--; 5229 } 5230 5231 /* Length is set after parsing the AID bitmap */ 5232 tim = skb_put(skb, sizeof(struct element)); 5233 tim->id = WLAN_EID_TIM; 5234 skb_put_u8(skb, ps->dtim_count); 5235 skb_put_u8(skb, link_conf->dtim_period); 5236 5237 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5238 mcast_traffic = true; 5239 5240 ps->dtim_bc_mc = mcast_traffic; 5241 5242 if (s1g) { 5243 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, mcast_traffic, 5244 have_bits); 5245 } else if (have_bits) { 5246 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5247 } else { 5248 /* Bitmap control */ 5249 skb_put_u8(skb, mcast_traffic); 5250 /* Part Virt Bitmap */ 5251 skb_put_u8(skb, 0); 5252 } 5253 5254 tim->datalen = skb_tail_pointer(skb) - tim->data; 5255 } 5256 5257 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5258 struct ieee80211_link_data *link, 5259 struct ps_data *ps, struct sk_buff *skb, 5260 bool is_template) 5261 { 5262 struct ieee80211_local *local = sdata->local; 5263 5264 /* 5265 * Not very nice, but we want to allow the driver to call 5266 * ieee80211_beacon_get() as a response to the set_tim() 5267 * callback. That, however, is already invoked under the 5268 * sta_lock to guarantee consistent and race-free update 5269 * of the tim bitmap in mac80211 and the driver. 5270 */ 5271 if (local->tim_in_locked_section) { 5272 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5273 } else { 5274 spin_lock_bh(&local->tim_lock); 5275 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5276 spin_unlock_bh(&local->tim_lock); 5277 } 5278 5279 return 0; 5280 } 5281 5282 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5283 struct beacon_data *beacon, 5284 struct ieee80211_link_data *link) 5285 { 5286 u8 *beacon_data, count, max_count = 1; 5287 struct probe_resp *resp; 5288 size_t beacon_data_len; 5289 u16 *bcn_offsets; 5290 int i; 5291 5292 switch (sdata->vif.type) { 5293 case NL80211_IFTYPE_AP: 5294 beacon_data = beacon->tail; 5295 beacon_data_len = beacon->tail_len; 5296 break; 5297 case NL80211_IFTYPE_ADHOC: 5298 beacon_data = beacon->head; 5299 beacon_data_len = beacon->head_len; 5300 break; 5301 case NL80211_IFTYPE_MESH_POINT: 5302 beacon_data = beacon->head; 5303 beacon_data_len = beacon->head_len; 5304 break; 5305 default: 5306 return; 5307 } 5308 5309 resp = rcu_dereference(link->u.ap.probe_resp); 5310 5311 bcn_offsets = beacon->cntdwn_counter_offsets; 5312 count = beacon->cntdwn_current_counter; 5313 if (link->conf->csa_active) 5314 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5315 5316 for (i = 0; i < max_count; ++i) { 5317 if (bcn_offsets[i]) { 5318 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5319 return; 5320 beacon_data[bcn_offsets[i]] = count; 5321 } 5322 5323 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5324 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5325 5326 if (resp_offsets[i]) 5327 resp->data[resp_offsets[i]] = count; 5328 } 5329 } 5330 } 5331 5332 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5333 struct beacon_data *beacon) 5334 { 5335 if (beacon->cntdwn_current_counter == 1) { 5336 /* 5337 * Channel switch handling is done by a worker thread while 5338 * beacons get pulled from hardware timers. It's therefore 5339 * possible that software threads are slow enough to not be 5340 * able to complete CSA handling in a single beacon interval, 5341 * in which case we get here. There isn't much to do about 5342 * it, other than letting the user know that the AP isn't 5343 * behaving correctly. 5344 */ 5345 link_err_once(link, 5346 "beacon TX faster than countdown (channel/color switch) completion\n"); 5347 return 0; 5348 } 5349 5350 beacon->cntdwn_current_counter--; 5351 5352 return beacon->cntdwn_current_counter; 5353 } 5354 5355 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5356 { 5357 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5358 struct ieee80211_link_data *link; 5359 struct beacon_data *beacon = NULL; 5360 u8 count = 0; 5361 5362 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5363 return 0; 5364 5365 rcu_read_lock(); 5366 5367 link = rcu_dereference(sdata->link[link_id]); 5368 if (!link) 5369 goto unlock; 5370 5371 if (sdata->vif.type == NL80211_IFTYPE_AP) 5372 beacon = rcu_dereference(link->u.ap.beacon); 5373 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5374 beacon = rcu_dereference(sdata->u.ibss.presp); 5375 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5376 beacon = rcu_dereference(sdata->u.mesh.beacon); 5377 5378 if (!beacon) 5379 goto unlock; 5380 5381 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5382 5383 unlock: 5384 rcu_read_unlock(); 5385 return count; 5386 } 5387 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5388 5389 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5390 { 5391 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5392 struct beacon_data *beacon = NULL; 5393 5394 rcu_read_lock(); 5395 5396 if (sdata->vif.type == NL80211_IFTYPE_AP) 5397 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5398 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5399 beacon = rcu_dereference(sdata->u.ibss.presp); 5400 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5401 beacon = rcu_dereference(sdata->u.mesh.beacon); 5402 5403 if (!beacon) 5404 goto unlock; 5405 5406 if (counter < beacon->cntdwn_current_counter) 5407 beacon->cntdwn_current_counter = counter; 5408 5409 unlock: 5410 rcu_read_unlock(); 5411 } 5412 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5413 5414 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5415 unsigned int link_id) 5416 { 5417 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5418 struct ieee80211_link_data *link; 5419 struct beacon_data *beacon = NULL; 5420 u8 *beacon_data; 5421 size_t beacon_data_len; 5422 int ret = false; 5423 5424 if (!ieee80211_sdata_running(sdata)) 5425 return false; 5426 5427 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5428 return 0; 5429 5430 rcu_read_lock(); 5431 5432 link = rcu_dereference(sdata->link[link_id]); 5433 if (!link) 5434 goto out; 5435 5436 if (vif->type == NL80211_IFTYPE_AP) { 5437 beacon = rcu_dereference(link->u.ap.beacon); 5438 if (WARN_ON(!beacon || !beacon->tail)) 5439 goto out; 5440 beacon_data = beacon->tail; 5441 beacon_data_len = beacon->tail_len; 5442 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5443 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5444 5445 beacon = rcu_dereference(ifibss->presp); 5446 if (!beacon) 5447 goto out; 5448 5449 beacon_data = beacon->head; 5450 beacon_data_len = beacon->head_len; 5451 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5452 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5453 5454 beacon = rcu_dereference(ifmsh->beacon); 5455 if (!beacon) 5456 goto out; 5457 5458 beacon_data = beacon->head; 5459 beacon_data_len = beacon->head_len; 5460 } else { 5461 WARN_ON(1); 5462 goto out; 5463 } 5464 5465 if (!beacon->cntdwn_counter_offsets[0]) 5466 goto out; 5467 5468 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5469 goto out; 5470 5471 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5472 ret = true; 5473 5474 out: 5475 rcu_read_unlock(); 5476 5477 return ret; 5478 } 5479 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5480 5481 static int ieee80211_beacon_protect(struct sk_buff *skb, 5482 struct ieee80211_local *local, 5483 struct ieee80211_sub_if_data *sdata, 5484 struct ieee80211_link_data *link) 5485 { 5486 ieee80211_tx_result res; 5487 struct ieee80211_tx_data tx; 5488 struct sk_buff *check_skb; 5489 5490 memset(&tx, 0, sizeof(tx)); 5491 tx.key = rcu_dereference(link->default_beacon_key); 5492 if (!tx.key) 5493 return 0; 5494 5495 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5496 tx.key = NULL; 5497 return -EINVAL; 5498 } 5499 5500 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5501 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5502 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5503 5504 tx.local = local; 5505 tx.sdata = sdata; 5506 __skb_queue_head_init(&tx.skbs); 5507 __skb_queue_tail(&tx.skbs, skb); 5508 res = ieee80211_tx_h_encrypt(&tx); 5509 check_skb = __skb_dequeue(&tx.skbs); 5510 /* we may crash after this, but it'd be a bug in crypto */ 5511 WARN_ON(check_skb != skb); 5512 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5513 return -EINVAL; 5514 5515 return 0; 5516 } 5517 5518 int ieee80211_encrypt_tx_skb(struct sk_buff *skb) 5519 { 5520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5521 struct ieee80211_sub_if_data *sdata = NULL; 5522 struct sk_buff *check_skb; 5523 struct ieee80211_tx_data tx; 5524 ieee80211_tx_result res; 5525 5526 if (!info->control.hw_key) 5527 return 0; 5528 5529 memset(&tx, 0, sizeof(tx)); 5530 tx.key = container_of(info->control.hw_key, struct ieee80211_key, conf); 5531 /* NULL it out now so we do full SW crypto */ 5532 info->control.hw_key = NULL; 5533 __skb_queue_head_init(&tx.skbs); 5534 __skb_queue_tail(&tx.skbs, skb); 5535 5536 if (skb->dev) 5537 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5538 else if (info->control.vif) 5539 sdata = vif_to_sdata(info->control.vif); 5540 5541 if (WARN_ON(!sdata)) 5542 return -EINVAL; 5543 5544 tx.sdata = sdata; 5545 tx.local = sdata->local; 5546 res = ieee80211_tx_h_encrypt(&tx); 5547 check_skb = __skb_dequeue(&tx.skbs); 5548 /* we may crash after this, but it'd be a bug in crypto */ 5549 WARN_ON(check_skb != skb); 5550 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5551 return -EINVAL; 5552 5553 return 0; 5554 } 5555 EXPORT_SYMBOL_GPL(ieee80211_encrypt_tx_skb); 5556 5557 static void 5558 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5559 struct ieee80211_vif *vif, 5560 struct ieee80211_link_data *link, 5561 struct ieee80211_mutable_offsets *offs, 5562 struct beacon_data *beacon, 5563 struct sk_buff *skb, 5564 struct ieee80211_chanctx_conf *chanctx_conf, 5565 u16 csa_off_base) 5566 { 5567 struct ieee80211_local *local = hw_to_local(hw); 5568 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5569 struct ieee80211_tx_info *info; 5570 enum nl80211_band band; 5571 struct ieee80211_tx_rate_control txrc; 5572 5573 /* CSA offsets */ 5574 if (offs && beacon) { 5575 u16 i; 5576 5577 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5578 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5579 5580 if (!csa_off) 5581 continue; 5582 5583 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5584 } 5585 } 5586 5587 band = chanctx_conf->def.chan->band; 5588 info = IEEE80211_SKB_CB(skb); 5589 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5590 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5591 info->band = band; 5592 5593 memset(&txrc, 0, sizeof(txrc)); 5594 txrc.hw = hw; 5595 txrc.sband = local->hw.wiphy->bands[band]; 5596 txrc.bss_conf = link->conf; 5597 txrc.skb = skb; 5598 txrc.reported_rate.idx = -1; 5599 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5600 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5601 else 5602 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5603 txrc.bss = true; 5604 rate_control_get_rate(sdata, NULL, &txrc); 5605 5606 info->control.vif = vif; 5607 info->control.flags |= u32_encode_bits(link->link_id, 5608 IEEE80211_TX_CTRL_MLO_LINK); 5609 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5610 IEEE80211_TX_CTL_ASSIGN_SEQ | 5611 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5612 } 5613 5614 static void 5615 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5616 u8 i) 5617 { 5618 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5619 i > beacon->mbssid_ies->cnt) 5620 return; 5621 5622 if (i < beacon->mbssid_ies->cnt) { 5623 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5624 beacon->mbssid_ies->elem[i].len); 5625 5626 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5627 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5628 beacon->rnr_ies->elem[i].len); 5629 5630 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5631 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5632 beacon->rnr_ies->elem[i].len); 5633 } 5634 return; 5635 } 5636 5637 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5638 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5639 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5640 beacon->mbssid_ies->elem[i].len); 5641 } 5642 5643 static struct sk_buff * 5644 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5645 struct ieee80211_vif *vif, 5646 struct ieee80211_link_data *link, 5647 struct ieee80211_mutable_offsets *offs, 5648 bool is_template, 5649 struct beacon_data *beacon, 5650 struct ieee80211_chanctx_conf *chanctx_conf, 5651 u8 ema_index) 5652 { 5653 struct ieee80211_local *local = hw_to_local(hw); 5654 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5655 struct ieee80211_if_ap *ap = &sdata->u.ap; 5656 struct sk_buff *skb = NULL; 5657 u16 csa_off_base = 0; 5658 int mbssid_len; 5659 5660 if (beacon->cntdwn_counter_offsets[0]) { 5661 if (!is_template) 5662 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5663 5664 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5665 } 5666 5667 /* headroom, head length, 5668 * tail length, maximum TIM length and multiple BSSID length 5669 */ 5670 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5671 beacon->rnr_ies, 5672 ema_index); 5673 5674 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5675 beacon->tail_len + 256 + 5676 local->hw.extra_beacon_tailroom + mbssid_len); 5677 if (!skb) 5678 return NULL; 5679 5680 skb_reserve(skb, local->tx_headroom); 5681 skb_put_data(skb, beacon->head, beacon->head_len); 5682 5683 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5684 5685 if (offs) { 5686 offs->tim_offset = beacon->head_len; 5687 offs->tim_length = skb->len - beacon->head_len; 5688 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5689 5690 if (mbssid_len) { 5691 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5692 offs->mbssid_off = skb->len - mbssid_len; 5693 } 5694 5695 /* for AP the csa offsets are from tail */ 5696 csa_off_base = skb->len; 5697 } 5698 5699 if (beacon->tail) 5700 skb_put_data(skb, beacon->tail, beacon->tail_len); 5701 5702 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5703 dev_kfree_skb(skb); 5704 return NULL; 5705 } 5706 5707 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5708 chanctx_conf, csa_off_base); 5709 return skb; 5710 } 5711 5712 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5713 struct ieee80211_link_data *link) 5714 { 5715 struct ps_data *ps = &sdata->u.ap.ps; 5716 5717 if (ps->sb_count == 0) 5718 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5719 else 5720 ps->sb_count--; 5721 5722 return ps->sb_count == 0; 5723 } 5724 5725 static struct sk_buff * 5726 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5727 struct ieee80211_vif *vif, 5728 struct ieee80211_link_data *link, 5729 struct ieee80211_chanctx_conf *chanctx_conf, 5730 struct s1g_short_beacon_data *sb, 5731 bool is_template) 5732 { 5733 struct ieee80211_local *local = hw_to_local(hw); 5734 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5735 struct ieee80211_if_ap *ap = &sdata->u.ap; 5736 struct sk_buff *skb; 5737 5738 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5739 sb->short_tail_len + 256 + 5740 local->hw.extra_beacon_tailroom); 5741 if (!skb) 5742 return NULL; 5743 5744 skb_reserve(skb, local->tx_headroom); 5745 skb_put_data(skb, sb->short_head, sb->short_head_len); 5746 5747 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5748 5749 if (sb->short_tail) 5750 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5751 5752 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5753 chanctx_conf, 0); 5754 return skb; 5755 } 5756 5757 static struct sk_buff * 5758 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5759 struct ieee80211_link_data *link, 5760 struct ieee80211_mutable_offsets *offs, 5761 bool is_template, struct beacon_data *beacon, 5762 struct ieee80211_chanctx_conf *chanctx_conf, 5763 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5764 { 5765 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5766 5767 if (!sdata->vif.cfg.s1g || !s1g_sb || 5768 ieee80211_s1g_need_long_beacon(sdata, link)) 5769 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5770 is_template, beacon, 5771 chanctx_conf, ema_index); 5772 5773 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5774 s1g_sb, is_template); 5775 } 5776 5777 static struct ieee80211_ema_beacons * 5778 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5779 struct ieee80211_vif *vif, 5780 struct ieee80211_link_data *link, 5781 struct ieee80211_mutable_offsets *offs, 5782 bool is_template, struct beacon_data *beacon, 5783 struct ieee80211_chanctx_conf *chanctx_conf) 5784 { 5785 struct ieee80211_ema_beacons *ema = NULL; 5786 5787 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5788 return NULL; 5789 5790 ema = kzalloc_flex(*ema, bcn, beacon->mbssid_ies->cnt, GFP_ATOMIC); 5791 if (!ema) 5792 return NULL; 5793 5794 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5795 ema->bcn[ema->cnt].skb = 5796 ieee80211_beacon_get_ap(hw, vif, link, 5797 &ema->bcn[ema->cnt].offs, 5798 is_template, beacon, 5799 chanctx_conf, ema->cnt, NULL); 5800 if (!ema->bcn[ema->cnt].skb) 5801 break; 5802 } 5803 5804 if (ema->cnt == beacon->mbssid_ies->cnt) 5805 return ema; 5806 5807 ieee80211_beacon_free_ema_list(ema); 5808 return NULL; 5809 } 5810 5811 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5812 5813 static struct sk_buff * 5814 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5815 struct ieee80211_vif *vif, 5816 struct ieee80211_mutable_offsets *offs, 5817 bool is_template, 5818 unsigned int link_id, 5819 int ema_index, 5820 struct ieee80211_ema_beacons **ema_beacons) 5821 { 5822 struct ieee80211_local *local = hw_to_local(hw); 5823 struct beacon_data *beacon = NULL; 5824 struct sk_buff *skb = NULL; 5825 struct ieee80211_sub_if_data *sdata = NULL; 5826 struct ieee80211_chanctx_conf *chanctx_conf; 5827 struct ieee80211_link_data *link; 5828 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5829 5830 rcu_read_lock(); 5831 5832 sdata = vif_to_sdata(vif); 5833 link = rcu_dereference(sdata->link[link_id]); 5834 if (!link) 5835 goto out; 5836 chanctx_conf = 5837 rcu_dereference(link->conf->chanctx_conf); 5838 5839 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5840 goto out; 5841 5842 if (offs) 5843 memset(offs, 0, sizeof(*offs)); 5844 5845 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5846 beacon = rcu_dereference(link->u.ap.beacon); 5847 if (!beacon) 5848 goto out; 5849 5850 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5851 s1g_short_bcn = 5852 rcu_dereference(link->u.ap.s1g_short_beacon); 5853 if (!s1g_short_bcn) 5854 goto out; 5855 } 5856 5857 if (ema_beacons) { 5858 *ema_beacons = 5859 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5860 offs, 5861 is_template, 5862 beacon, 5863 chanctx_conf); 5864 } else { 5865 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5866 if (ema_index >= beacon->mbssid_ies->cnt) 5867 goto out; /* End of MBSSID elements */ 5868 5869 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5870 ema_index = beacon->mbssid_ies->cnt; 5871 } else { 5872 ema_index = 0; 5873 } 5874 5875 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5876 is_template, beacon, 5877 chanctx_conf, ema_index, 5878 s1g_short_bcn); 5879 } 5880 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5881 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5882 struct ieee80211_hdr *hdr; 5883 5884 beacon = rcu_dereference(ifibss->presp); 5885 if (!beacon) 5886 goto out; 5887 5888 if (beacon->cntdwn_counter_offsets[0]) { 5889 if (!is_template) 5890 __ieee80211_beacon_update_cntdwn(link, beacon); 5891 5892 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5893 } 5894 5895 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5896 local->hw.extra_beacon_tailroom); 5897 if (!skb) 5898 goto out; 5899 skb_reserve(skb, local->tx_headroom); 5900 skb_put_data(skb, beacon->head, beacon->head_len); 5901 5902 hdr = (struct ieee80211_hdr *) skb->data; 5903 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5904 IEEE80211_STYPE_BEACON); 5905 5906 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5907 chanctx_conf, 0); 5908 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5909 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5910 5911 beacon = rcu_dereference(ifmsh->beacon); 5912 if (!beacon) 5913 goto out; 5914 5915 if (beacon->cntdwn_counter_offsets[0]) { 5916 if (!is_template) 5917 /* TODO: For mesh csa_counter is in TU, so 5918 * decrementing it by one isn't correct, but 5919 * for now we leave it consistent with overall 5920 * mac80211's behavior. 5921 */ 5922 __ieee80211_beacon_update_cntdwn(link, beacon); 5923 5924 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5925 } 5926 5927 if (ifmsh->sync_ops) 5928 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5929 5930 skb = dev_alloc_skb(local->tx_headroom + 5931 beacon->head_len + 5932 256 + /* TIM IE */ 5933 beacon->tail_len + 5934 local->hw.extra_beacon_tailroom); 5935 if (!skb) 5936 goto out; 5937 skb_reserve(skb, local->tx_headroom); 5938 skb_put_data(skb, beacon->head, beacon->head_len); 5939 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5940 is_template); 5941 5942 if (offs) { 5943 offs->tim_offset = beacon->head_len; 5944 offs->tim_length = skb->len - beacon->head_len; 5945 } 5946 5947 skb_put_data(skb, beacon->tail, beacon->tail_len); 5948 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5949 chanctx_conf, 0); 5950 } else { 5951 WARN_ON(1); 5952 goto out; 5953 } 5954 5955 out: 5956 rcu_read_unlock(); 5957 return skb; 5958 5959 } 5960 5961 struct sk_buff * 5962 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5963 struct ieee80211_vif *vif, 5964 struct ieee80211_mutable_offsets *offs, 5965 unsigned int link_id) 5966 { 5967 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5968 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5969 } 5970 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5971 5972 struct sk_buff * 5973 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5974 struct ieee80211_vif *vif, 5975 struct ieee80211_mutable_offsets *offs, 5976 unsigned int link_id, u8 ema_index) 5977 { 5978 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5979 NULL); 5980 } 5981 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5982 5983 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5984 { 5985 u8 i; 5986 5987 if (!ema_beacons) 5988 return; 5989 5990 for (i = 0; i < ema_beacons->cnt; i++) 5991 kfree_skb(ema_beacons->bcn[i].skb); 5992 5993 kfree(ema_beacons); 5994 } 5995 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5996 5997 struct ieee80211_ema_beacons * 5998 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5999 struct ieee80211_vif *vif, 6000 unsigned int link_id) 6001 { 6002 struct ieee80211_ema_beacons *ema_beacons = NULL; 6003 6004 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 6005 &ema_beacons)); 6006 6007 return ema_beacons; 6008 } 6009 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 6010 6011 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 6012 struct ieee80211_vif *vif, 6013 u16 *tim_offset, u16 *tim_length, 6014 unsigned int link_id) 6015 { 6016 struct ieee80211_mutable_offsets offs = {}; 6017 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 6018 link_id, 6019 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 6020 NULL); 6021 struct sk_buff *copy; 6022 6023 if (!bcn) 6024 return bcn; 6025 6026 if (tim_offset) 6027 *tim_offset = offs.tim_offset; 6028 6029 if (tim_length) 6030 *tim_length = offs.tim_length; 6031 6032 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 6033 !hw_to_local(hw)->monitors) 6034 return bcn; 6035 6036 /* send a copy to monitor interfaces */ 6037 copy = skb_copy(bcn, GFP_ATOMIC); 6038 if (!copy) 6039 return bcn; 6040 6041 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 6042 6043 return bcn; 6044 } 6045 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 6046 6047 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 6048 struct ieee80211_vif *vif) 6049 { 6050 struct sk_buff *skb = NULL; 6051 struct probe_resp *presp = NULL; 6052 struct ieee80211_hdr *hdr; 6053 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6054 6055 if (sdata->vif.type != NL80211_IFTYPE_AP) 6056 return NULL; 6057 6058 rcu_read_lock(); 6059 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 6060 if (!presp) 6061 goto out; 6062 6063 skb = dev_alloc_skb(presp->len); 6064 if (!skb) 6065 goto out; 6066 6067 skb_put_data(skb, presp->data, presp->len); 6068 6069 hdr = (struct ieee80211_hdr *) skb->data; 6070 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 6071 6072 out: 6073 rcu_read_unlock(); 6074 return skb; 6075 } 6076 EXPORT_SYMBOL(ieee80211_proberesp_get); 6077 6078 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 6079 struct ieee80211_vif *vif, 6080 unsigned int link_id) 6081 { 6082 struct sk_buff *skb = NULL; 6083 struct fils_discovery_data *tmpl = NULL; 6084 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6085 struct ieee80211_link_data *link; 6086 6087 if (sdata->vif.type != NL80211_IFTYPE_AP) 6088 return NULL; 6089 6090 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6091 return NULL; 6092 6093 guard(rcu)(); 6094 link = rcu_dereference(sdata->link[link_id]); 6095 if (!link) 6096 return NULL; 6097 6098 tmpl = rcu_dereference(link->u.ap.fils_discovery); 6099 if (!tmpl) 6100 return NULL; 6101 6102 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6103 if (skb) { 6104 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6105 skb_put_data(skb, tmpl->data, tmpl->len); 6106 } 6107 6108 return skb; 6109 } 6110 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 6111 6112 struct sk_buff * 6113 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 6114 struct ieee80211_vif *vif, 6115 unsigned int link_id) 6116 { 6117 struct sk_buff *skb = NULL; 6118 struct unsol_bcast_probe_resp_data *tmpl = NULL; 6119 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6120 struct ieee80211_link_data *link; 6121 6122 if (sdata->vif.type != NL80211_IFTYPE_AP) 6123 return NULL; 6124 6125 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6126 return NULL; 6127 6128 guard(rcu)(); 6129 link = rcu_dereference(sdata->link[link_id]); 6130 if (!link) 6131 return NULL; 6132 6133 tmpl = rcu_dereference(link->u.ap.unsol_bcast_probe_resp); 6134 if (!tmpl) 6135 return NULL; 6136 6137 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6138 if (skb) { 6139 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6140 skb_put_data(skb, tmpl->data, tmpl->len); 6141 } 6142 6143 return skb; 6144 } 6145 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 6146 6147 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 6148 struct ieee80211_vif *vif) 6149 { 6150 struct ieee80211_sub_if_data *sdata; 6151 struct ieee80211_pspoll *pspoll; 6152 struct ieee80211_local *local; 6153 struct sk_buff *skb; 6154 6155 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6156 return NULL; 6157 6158 sdata = vif_to_sdata(vif); 6159 local = sdata->local; 6160 6161 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 6162 if (!skb) 6163 return NULL; 6164 6165 skb_reserve(skb, local->hw.extra_tx_headroom); 6166 6167 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 6168 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 6169 IEEE80211_STYPE_PSPOLL); 6170 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 6171 6172 /* aid in PS-Poll has its two MSBs each set to 1 */ 6173 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 6174 6175 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 6176 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 6177 6178 return skb; 6179 } 6180 EXPORT_SYMBOL(ieee80211_pspoll_get); 6181 6182 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 6183 struct ieee80211_vif *vif, 6184 int link_id, bool qos_ok) 6185 { 6186 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6187 struct ieee80211_local *local = sdata->local; 6188 struct ieee80211_link_data *link = NULL; 6189 struct ieee80211_hdr_3addr *nullfunc; 6190 struct sk_buff *skb; 6191 bool qos = false; 6192 6193 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6194 return NULL; 6195 6196 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6197 sizeof(*nullfunc) + 2); 6198 if (!skb) 6199 return NULL; 6200 6201 rcu_read_lock(); 6202 if (qos_ok) { 6203 struct sta_info *sta; 6204 6205 sta = sta_info_get(sdata, vif->cfg.ap_addr); 6206 qos = sta && sta->sta.wme; 6207 } 6208 6209 if (link_id >= 0) { 6210 link = rcu_dereference(sdata->link[link_id]); 6211 if (WARN_ON_ONCE(!link)) { 6212 rcu_read_unlock(); 6213 kfree_skb(skb); 6214 return NULL; 6215 } 6216 } 6217 6218 skb_reserve(skb, local->hw.extra_tx_headroom); 6219 6220 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 6221 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 6222 IEEE80211_STYPE_NULLFUNC | 6223 IEEE80211_FCTL_TODS); 6224 if (qos) { 6225 __le16 qoshdr = cpu_to_le16(7); 6226 6227 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 6228 IEEE80211_STYPE_NULLFUNC) != 6229 IEEE80211_STYPE_QOS_NULLFUNC); 6230 nullfunc->frame_control |= 6231 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 6232 skb->priority = 7; 6233 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 6234 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 6235 } 6236 6237 if (link) { 6238 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 6239 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 6240 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 6241 } else { 6242 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 6243 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 6244 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 6245 } 6246 rcu_read_unlock(); 6247 6248 return skb; 6249 } 6250 EXPORT_SYMBOL(ieee80211_nullfunc_get); 6251 6252 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 6253 const u8 *src_addr, 6254 const u8 *ssid, size_t ssid_len, 6255 size_t tailroom) 6256 { 6257 struct ieee80211_local *local = hw_to_local(hw); 6258 struct ieee80211_hdr_3addr *hdr; 6259 struct sk_buff *skb; 6260 size_t ie_ssid_len; 6261 u8 *pos; 6262 6263 ie_ssid_len = 2 + ssid_len; 6264 6265 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6266 ie_ssid_len + tailroom); 6267 if (!skb) 6268 return NULL; 6269 6270 skb_reserve(skb, local->hw.extra_tx_headroom); 6271 6272 hdr = skb_put_zero(skb, sizeof(*hdr)); 6273 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6274 IEEE80211_STYPE_PROBE_REQ); 6275 eth_broadcast_addr(hdr->addr1); 6276 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6277 eth_broadcast_addr(hdr->addr3); 6278 6279 pos = skb_put(skb, ie_ssid_len); 6280 *pos++ = WLAN_EID_SSID; 6281 *pos++ = ssid_len; 6282 if (ssid_len) 6283 memcpy(pos, ssid, ssid_len); 6284 pos += ssid_len; 6285 6286 return skb; 6287 } 6288 EXPORT_SYMBOL(ieee80211_probereq_get); 6289 6290 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6291 const void *frame, size_t frame_len, 6292 const struct ieee80211_tx_info *frame_txctl, 6293 struct ieee80211_rts *rts) 6294 { 6295 const struct ieee80211_hdr *hdr = frame; 6296 6297 rts->frame_control = 6298 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6299 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6300 frame_txctl); 6301 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6302 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6303 } 6304 EXPORT_SYMBOL(ieee80211_rts_get); 6305 6306 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6307 const void *frame, size_t frame_len, 6308 const struct ieee80211_tx_info *frame_txctl, 6309 struct ieee80211_cts *cts) 6310 { 6311 const struct ieee80211_hdr *hdr = frame; 6312 6313 cts->frame_control = 6314 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6315 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6316 frame_len, frame_txctl); 6317 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6318 } 6319 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6320 6321 struct sk_buff * 6322 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6323 struct ieee80211_vif *vif) 6324 { 6325 struct ieee80211_local *local = hw_to_local(hw); 6326 struct sk_buff *skb = NULL; 6327 struct ieee80211_tx_data tx; 6328 struct ieee80211_sub_if_data *sdata; 6329 struct ps_data *ps; 6330 struct ieee80211_tx_info *info; 6331 struct ieee80211_chanctx_conf *chanctx_conf; 6332 6333 sdata = vif_to_sdata(vif); 6334 6335 rcu_read_lock(); 6336 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6337 6338 if (!chanctx_conf) 6339 goto out; 6340 6341 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6342 struct beacon_data *beacon = 6343 rcu_dereference(sdata->deflink.u.ap.beacon); 6344 6345 if (!beacon || !beacon->head) 6346 goto out; 6347 6348 ps = &sdata->u.ap.ps; 6349 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6350 ps = &sdata->u.mesh.ps; 6351 } else { 6352 goto out; 6353 } 6354 6355 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6356 goto out; /* send buffered bc/mc only after DTIM beacon */ 6357 6358 while (1) { 6359 skb = skb_dequeue(&ps->bc_buf); 6360 if (!skb) 6361 goto out; 6362 local->total_ps_buffered--; 6363 6364 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6365 struct ieee80211_hdr *hdr = 6366 (struct ieee80211_hdr *) skb->data; 6367 /* more buffered multicast/broadcast frames ==> set 6368 * MoreData flag in IEEE 802.11 header to inform PS 6369 * STAs */ 6370 hdr->frame_control |= 6371 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6372 } 6373 6374 if (sdata->vif.type == NL80211_IFTYPE_AP) 6375 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6376 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6377 break; 6378 ieee80211_free_txskb(hw, skb); 6379 } 6380 6381 info = IEEE80211_SKB_CB(skb); 6382 6383 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6384 info->band = chanctx_conf->def.chan->band; 6385 6386 if (invoke_tx_handlers(&tx)) 6387 skb = NULL; 6388 out: 6389 rcu_read_unlock(); 6390 6391 return skb; 6392 } 6393 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6394 6395 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6396 { 6397 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6398 struct ieee80211_sub_if_data *sdata = sta->sdata; 6399 struct ieee80211_local *local = sdata->local; 6400 int ret; 6401 u32 queues; 6402 6403 lockdep_assert_wiphy(local->hw.wiphy); 6404 6405 /* only some cases are supported right now */ 6406 switch (sdata->vif.type) { 6407 case NL80211_IFTYPE_STATION: 6408 case NL80211_IFTYPE_AP: 6409 case NL80211_IFTYPE_AP_VLAN: 6410 break; 6411 default: 6412 WARN_ON(1); 6413 return -EINVAL; 6414 } 6415 6416 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6417 return -EINVAL; 6418 6419 if (sta->reserved_tid == tid) { 6420 ret = 0; 6421 goto out; 6422 } 6423 6424 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6425 sdata_err(sdata, "TID reservation already active\n"); 6426 ret = -EALREADY; 6427 goto out; 6428 } 6429 6430 ieee80211_stop_vif_queues(sdata->local, sdata, 6431 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6432 6433 synchronize_net(); 6434 6435 /* Tear down BA sessions so we stop aggregating on this TID */ 6436 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6437 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6438 __ieee80211_stop_tx_ba_session(sta, tid, 6439 AGG_STOP_LOCAL_REQUEST); 6440 } 6441 6442 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6443 __ieee80211_flush_queues(local, sdata, queues, false); 6444 6445 sta->reserved_tid = tid; 6446 6447 ieee80211_wake_vif_queues(local, sdata, 6448 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6449 6450 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6451 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6452 6453 ret = 0; 6454 out: 6455 return ret; 6456 } 6457 EXPORT_SYMBOL(ieee80211_reserve_tid); 6458 6459 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6460 { 6461 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6462 struct ieee80211_sub_if_data *sdata = sta->sdata; 6463 6464 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6465 6466 /* only some cases are supported right now */ 6467 switch (sdata->vif.type) { 6468 case NL80211_IFTYPE_STATION: 6469 case NL80211_IFTYPE_AP: 6470 case NL80211_IFTYPE_AP_VLAN: 6471 break; 6472 default: 6473 WARN_ON(1); 6474 return; 6475 } 6476 6477 if (tid != sta->reserved_tid) { 6478 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6479 return; 6480 } 6481 6482 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6483 } 6484 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6485 6486 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6487 struct sk_buff *skb, int tid, int link_id, 6488 enum nl80211_band band) 6489 { 6490 const struct ieee80211_hdr *hdr = (void *)skb->data; 6491 int ac = ieee80211_ac_from_tid(tid); 6492 unsigned int link; 6493 6494 skb_reset_mac_header(skb); 6495 skb_set_queue_mapping(skb, ac); 6496 skb->priority = tid; 6497 6498 skb->dev = sdata->dev; 6499 6500 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6501 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6502 IEEE80211_LINK_UNSPECIFIED)); 6503 6504 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6505 link = 0; 6506 } else if (link_id >= 0) { 6507 link = link_id; 6508 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6509 /* address from the MLD */ 6510 link = IEEE80211_LINK_UNSPECIFIED; 6511 } else { 6512 /* otherwise must be addressed from a link */ 6513 rcu_read_lock(); 6514 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6515 struct ieee80211_bss_conf *link_conf; 6516 6517 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6518 if (!link_conf) 6519 continue; 6520 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6521 break; 6522 } 6523 rcu_read_unlock(); 6524 6525 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6526 link = ffs(sdata->vif.active_links) - 1; 6527 } 6528 6529 IEEE80211_SKB_CB(skb)->control.flags |= 6530 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6531 6532 /* 6533 * The other path calling ieee80211_xmit is from the tasklet, 6534 * and while we can handle concurrent transmissions locking 6535 * requirements are that we do not come into tx with bhs on. 6536 */ 6537 local_bh_disable(); 6538 IEEE80211_SKB_CB(skb)->band = band; 6539 ieee80211_xmit(sdata, NULL, skb); 6540 local_bh_enable(); 6541 } 6542 6543 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6544 struct sk_buff *skb, int tid, int link_id) 6545 { 6546 struct ieee80211_chanctx_conf *chanctx_conf; 6547 enum nl80211_band band; 6548 6549 rcu_read_lock(); 6550 if (sdata->vif.type == NL80211_IFTYPE_NAN || 6551 sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 6552 band = NUM_NL80211_BANDS; 6553 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6554 WARN_ON(link_id >= 0); 6555 chanctx_conf = 6556 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6557 if (WARN_ON(!chanctx_conf)) { 6558 rcu_read_unlock(); 6559 kfree_skb(skb); 6560 return; 6561 } 6562 band = chanctx_conf->def.chan->band; 6563 } else { 6564 WARN_ON(link_id >= 0 && 6565 !(sdata->vif.active_links & BIT(link_id))); 6566 /* MLD transmissions must not rely on the band */ 6567 band = 0; 6568 } 6569 6570 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6571 rcu_read_unlock(); 6572 } 6573 6574 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6575 const u8 *buf, size_t len, 6576 const u8 *dest, __be16 proto, bool unencrypted, 6577 int link_id, u64 cookie) 6578 { 6579 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6580 struct ieee80211_local *local = sdata->local; 6581 struct sta_info *sta; 6582 struct sk_buff *skb; 6583 struct ethhdr *ehdr; 6584 u32 ctrl_flags = 0; 6585 u32 flags = 0; 6586 int err; 6587 6588 /* mutex lock is only needed for incrementing the cookie counter */ 6589 lockdep_assert_wiphy(local->hw.wiphy); 6590 6591 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6592 * or Pre-Authentication 6593 */ 6594 if (proto != sdata->control_port_protocol && 6595 proto != cpu_to_be16(ETH_P_PREAUTH)) 6596 return -EINVAL; 6597 6598 if (proto == sdata->control_port_protocol) 6599 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6600 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6601 6602 if (unencrypted) 6603 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6604 6605 if (cookie) 6606 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6607 6608 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6609 6610 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6611 sizeof(struct ethhdr) + len); 6612 if (!skb) 6613 return -ENOMEM; 6614 6615 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6616 6617 skb_put_data(skb, buf, len); 6618 6619 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6620 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6621 6622 /* we may override the SA for MLO STA later */ 6623 if (link_id < 0) { 6624 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6625 IEEE80211_TX_CTRL_MLO_LINK); 6626 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6627 } else { 6628 struct ieee80211_bss_conf *link_conf; 6629 6630 ctrl_flags |= u32_encode_bits(link_id, 6631 IEEE80211_TX_CTRL_MLO_LINK); 6632 6633 rcu_read_lock(); 6634 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6635 if (!link_conf) { 6636 dev_kfree_skb(skb); 6637 rcu_read_unlock(); 6638 return -ENOLINK; 6639 } 6640 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6641 rcu_read_unlock(); 6642 } 6643 6644 ehdr->h_proto = proto; 6645 6646 skb->dev = dev; 6647 skb->protocol = proto; 6648 skb_reset_network_header(skb); 6649 skb_reset_mac_header(skb); 6650 6651 if (local->hw.queues < IEEE80211_NUM_ACS) 6652 goto start_xmit; 6653 6654 /* update QoS header to prioritize control port frames if possible, 6655 * prioritization also happens for control port frames send over 6656 * AF_PACKET 6657 */ 6658 rcu_read_lock(); 6659 err = ieee80211_lookup_ra_sta(sdata, skb, &sta, true); 6660 if (err) { 6661 dev_kfree_skb(skb); 6662 rcu_read_unlock(); 6663 return err; 6664 } 6665 6666 if (!IS_ERR(sta)) { 6667 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6668 6669 skb_set_queue_mapping(skb, queue); 6670 6671 /* 6672 * for MLO STA, the SA should be the AP MLD address, but 6673 * the link ID has been selected already 6674 */ 6675 if (sta && sta->sta.mlo) 6676 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6677 } 6678 rcu_read_unlock(); 6679 6680 start_xmit: 6681 local_bh_disable(); 6682 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6683 local_bh_enable(); 6684 6685 return 0; 6686 } 6687 6688 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6689 const u8 *buf, size_t len) 6690 { 6691 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6692 struct ieee80211_local *local = sdata->local; 6693 struct sk_buff *skb; 6694 6695 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6696 30 + /* header size */ 6697 18); /* 11s header size */ 6698 if (!skb) 6699 return -ENOMEM; 6700 6701 skb_reserve(skb, local->hw.extra_tx_headroom); 6702 skb_put_data(skb, buf, len); 6703 6704 skb->dev = dev; 6705 skb->protocol = htons(ETH_P_802_3); 6706 skb_reset_network_header(skb); 6707 skb_reset_mac_header(skb); 6708 6709 local_bh_disable(); 6710 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6711 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6712 0); 6713 local_bh_enable(); 6714 6715 return 0; 6716 } 6717