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->len < 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->len < 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->len < 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->len < 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->len >= 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) 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 sta = sta_info_get_bss(sdata, skb->data); 2557 break; 2558 #ifdef CONFIG_MAC80211_MESH 2559 case NL80211_IFTYPE_MESH_POINT: 2560 /* determined much later */ 2561 *sta_out = NULL; 2562 return 0; 2563 #endif 2564 case NL80211_IFTYPE_STATION: 2565 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2566 sta = sta_info_get(sdata, skb->data); 2567 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2568 if (test_sta_flag(sta, 2569 WLAN_STA_TDLS_PEER_AUTH)) { 2570 *sta_out = sta; 2571 return 0; 2572 } 2573 2574 /* 2575 * TDLS link during setup - throw out frames to 2576 * peer. Allow TDLS-setup frames to unauthorized 2577 * peers for the special case of a link teardown 2578 * after a TDLS sta is removed due to being 2579 * unreachable. 2580 */ 2581 if (!ieee80211_is_tdls_setup(skb)) 2582 return -EINVAL; 2583 } 2584 2585 } 2586 2587 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2588 if (!sta) 2589 return -ENOLINK; 2590 break; 2591 case NL80211_IFTYPE_NAN_DATA: 2592 if (is_multicast_ether_addr(skb->data)) { 2593 *sta_out = ERR_PTR(-ENOENT); 2594 return 0; 2595 } 2596 sta = sta_info_get(sdata, skb->data); 2597 break; 2598 default: 2599 return -EINVAL; 2600 } 2601 2602 *sta_out = sta ?: ERR_PTR(-ENOENT); 2603 return 0; 2604 } 2605 2606 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2607 struct sk_buff *skb, 2608 u32 *info_flags, 2609 u64 cookie) 2610 { 2611 struct sk_buff *ack_skb; 2612 u16 info_id = 0; 2613 2614 if (skb->sk) 2615 ack_skb = skb_clone_sk(skb); 2616 else 2617 ack_skb = skb_clone(skb, GFP_ATOMIC); 2618 2619 if (ack_skb) { 2620 unsigned long flags; 2621 int id; 2622 2623 spin_lock_irqsave(&local->ack_status_lock, flags); 2624 id = idr_alloc(&local->ack_status_frames, ack_skb, 2625 1, 0x2000, GFP_ATOMIC); 2626 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2627 2628 if (id >= 0) { 2629 info_id = id; 2630 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2631 if (cookie) 2632 IEEE80211_SKB_CB(ack_skb)->ack.cookie = cookie; 2633 } else { 2634 kfree_skb(ack_skb); 2635 } 2636 } 2637 2638 return info_id; 2639 } 2640 2641 static void ieee80211_remove_ack_skb(struct ieee80211_local *local, u16 info_id) 2642 { 2643 struct sk_buff *ack_skb; 2644 unsigned long flags; 2645 2646 spin_lock_irqsave(&local->ack_status_lock, flags); 2647 ack_skb = idr_remove(&local->ack_status_frames, info_id); 2648 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2649 2650 kfree_skb(ack_skb); 2651 } 2652 2653 /** 2654 * ieee80211_build_hdr - build 802.11 header in the given frame 2655 * @sdata: virtual interface to build the header for 2656 * @skb: the skb to build the header in 2657 * @info_flags: skb flags to set 2658 * @sta: the station pointer 2659 * @ctrl_flags: info control flags to set 2660 * @cookie: cookie pointer to fill (if not %NULL) 2661 * 2662 * This function takes the skb with 802.3 header and reformats the header to 2663 * the appropriate IEEE 802.11 header based on which interface the packet is 2664 * being transmitted on. 2665 * 2666 * Note that this function also takes care of the TX status request and 2667 * potential unsharing of the SKB - this needs to be interleaved with the 2668 * header building. 2669 * 2670 * The function requires the read-side RCU lock held 2671 * 2672 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2673 */ 2674 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2675 struct sk_buff *skb, u32 info_flags, 2676 struct sta_info *sta, u32 ctrl_flags, 2677 u64 cookie) 2678 { 2679 struct ieee80211_local *local = sdata->local; 2680 struct ieee80211_tx_info *info; 2681 int head_need; 2682 u16 ethertype, hdrlen, meshhdrlen = 0; 2683 __le16 fc; 2684 struct ieee80211_hdr hdr; 2685 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2686 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2687 const u8 *encaps_data; 2688 int encaps_len, skip_header_bytes; 2689 bool wme_sta = false, authorized = false; 2690 bool tdls_peer; 2691 bool multicast; 2692 u16 info_id = 0; 2693 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2694 enum nl80211_band band; 2695 int ret; 2696 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2697 2698 if (IS_ERR(sta)) 2699 sta = NULL; 2700 2701 #ifdef CONFIG_MAC80211_DEBUGFS 2702 if (local->force_tx_status) 2703 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2704 #endif 2705 2706 /* convert Ethernet header to proper 802.11 header (based on 2707 * operation mode) */ 2708 ethertype = (skb->data[12] << 8) | skb->data[13]; 2709 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2710 2711 if (!ieee80211_vif_is_mld(&sdata->vif)) 2712 chanctx_conf = 2713 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2714 2715 switch (sdata->vif.type) { 2716 case NL80211_IFTYPE_AP_VLAN: 2717 if (sdata->wdev.use_4addr) { 2718 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2719 /* RA TA DA SA */ 2720 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2721 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2722 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2723 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2724 hdrlen = 30; 2725 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2726 wme_sta = sta->sta.wme; 2727 } 2728 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2729 struct ieee80211_sub_if_data *ap_sdata; 2730 2731 /* override chanctx_conf from AP (we don't have one) */ 2732 ap_sdata = container_of(sdata->bss, 2733 struct ieee80211_sub_if_data, 2734 u.ap); 2735 chanctx_conf = 2736 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2737 } 2738 if (sdata->wdev.use_4addr) 2739 break; 2740 fallthrough; 2741 case NL80211_IFTYPE_AP: 2742 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2743 /* DA BSSID SA */ 2744 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2745 2746 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2747 struct ieee80211_link_data *link; 2748 2749 link_id = sta->deflink.link_id; 2750 link = rcu_dereference(sdata->link[link_id]); 2751 if (WARN_ON(!link)) { 2752 ret = -ENOLINK; 2753 goto free; 2754 } 2755 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2756 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2757 (sta && sta->sta.mlo)) { 2758 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2759 } else { 2760 struct ieee80211_bss_conf *conf; 2761 2762 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2763 if (unlikely(!conf)) { 2764 ret = -ENOLINK; 2765 goto free; 2766 } 2767 2768 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2769 } 2770 2771 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2772 hdrlen = 24; 2773 break; 2774 #ifdef CONFIG_MAC80211_MESH 2775 case NL80211_IFTYPE_MESH_POINT: 2776 if (!is_multicast_ether_addr(skb->data)) { 2777 struct sta_info *next_hop; 2778 bool mpp_lookup = true; 2779 2780 mpath = mesh_path_lookup(sdata, skb->data); 2781 if (mpath) { 2782 mpp_lookup = false; 2783 next_hop = rcu_dereference(mpath->next_hop); 2784 if (!next_hop || 2785 !(mpath->flags & (MESH_PATH_ACTIVE | 2786 MESH_PATH_RESOLVING))) 2787 mpp_lookup = true; 2788 } 2789 2790 if (mpp_lookup) { 2791 mppath = mpp_path_lookup(sdata, skb->data); 2792 if (mppath) 2793 mppath->exp_time = jiffies; 2794 } 2795 2796 if (mppath && mpath) 2797 mesh_path_del(sdata, mpath->dst); 2798 } 2799 2800 /* 2801 * Use address extension if it is a packet from 2802 * another interface or if we know the destination 2803 * is being proxied by a portal (i.e. portal address 2804 * differs from proxied address) 2805 */ 2806 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2807 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2808 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2809 skb->data, skb->data + ETH_ALEN); 2810 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2811 NULL, NULL); 2812 } else { 2813 /* DS -> MBSS (802.11-2012 13.11.3.3). 2814 * For unicast with unknown forwarding information, 2815 * destination might be in the MBSS or if that fails 2816 * forwarded to another mesh gate. In either case 2817 * resolution will be handled in ieee80211_xmit(), so 2818 * leave the original DA. This also works for mcast */ 2819 const u8 *mesh_da = skb->data; 2820 2821 if (mppath) 2822 mesh_da = mppath->mpp; 2823 else if (mpath) 2824 mesh_da = mpath->dst; 2825 2826 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2827 mesh_da, sdata->vif.addr); 2828 if (is_multicast_ether_addr(mesh_da)) 2829 /* DA TA mSA AE:SA */ 2830 meshhdrlen = ieee80211_new_mesh_header( 2831 sdata, &mesh_hdr, 2832 skb->data + ETH_ALEN, NULL); 2833 else 2834 /* RA TA mDA mSA AE:DA SA */ 2835 meshhdrlen = ieee80211_new_mesh_header( 2836 sdata, &mesh_hdr, skb->data, 2837 skb->data + ETH_ALEN); 2838 2839 } 2840 2841 /* For injected frames, fill RA right away as nexthop lookup 2842 * will be skipped. 2843 */ 2844 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2845 is_zero_ether_addr(hdr.addr1)) 2846 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2847 break; 2848 #endif 2849 case NL80211_IFTYPE_STATION: 2850 /* we already did checks when looking up the RA STA */ 2851 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2852 2853 if (tdls_peer) { 2854 /* For TDLS only one link can be valid with peer STA */ 2855 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2856 struct ieee80211_link_data *link; 2857 2858 /* DA SA BSSID */ 2859 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2860 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2861 link = rcu_dereference(sdata->link[tdls_link_id]); 2862 if (WARN_ON_ONCE(!link)) { 2863 ret = -EINVAL; 2864 goto free; 2865 } 2866 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2867 hdrlen = 24; 2868 } else if (sdata->u.mgd.use_4addr && 2869 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2870 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2871 IEEE80211_FCTL_TODS); 2872 /* RA TA DA SA */ 2873 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2874 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2875 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2876 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2877 hdrlen = 30; 2878 } else { 2879 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2880 /* BSSID SA DA */ 2881 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2882 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2883 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2884 hdrlen = 24; 2885 } 2886 break; 2887 case NL80211_IFTYPE_OCB: 2888 /* DA SA BSSID */ 2889 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2890 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2891 eth_broadcast_addr(hdr.addr3); 2892 hdrlen = 24; 2893 break; 2894 case NL80211_IFTYPE_ADHOC: 2895 /* DA SA BSSID */ 2896 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2897 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2898 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2899 hdrlen = 24; 2900 break; 2901 case NL80211_IFTYPE_NAN_DATA: { 2902 struct ieee80211_sub_if_data *nmi; 2903 2904 /* DA SA Cluster ID */ 2905 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2906 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2907 nmi = rcu_dereference(sdata->u.nan_data.nmi); 2908 if (!nmi) { 2909 ret = -ENOTCONN; 2910 goto free; 2911 } 2912 memcpy(hdr.addr3, nmi->u.nan.conf.cluster_id, ETH_ALEN); 2913 hdrlen = 24; 2914 break; 2915 } 2916 default: 2917 ret = -EINVAL; 2918 goto free; 2919 } 2920 2921 if (!chanctx_conf) { 2922 if (sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 2923 /* NAN operates on multiple bands */ 2924 band = NUM_NL80211_BANDS; 2925 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 2926 ret = -ENOTCONN; 2927 goto free; 2928 } else { 2929 /* MLD transmissions must not rely on the band */ 2930 band = 0; 2931 } 2932 } else { 2933 band = chanctx_conf->def.chan->band; 2934 } 2935 2936 multicast = is_multicast_ether_addr(hdr.addr1); 2937 2938 /* sta is always NULL for mesh */ 2939 if (sta) { 2940 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2941 wme_sta = sta->sta.wme; 2942 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2943 /* For mesh, the use of the QoS header is mandatory */ 2944 wme_sta = true; 2945 } 2946 2947 /* receiver does QoS (which also means we do) use it */ 2948 if (wme_sta) { 2949 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2950 hdrlen += 2; 2951 } 2952 2953 /* 2954 * Drop unicast frames to unauthorised stations unless they are 2955 * EAPOL frames from the local station. 2956 */ 2957 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2958 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2959 !multicast && !authorized && 2960 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2961 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2962 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2963 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2964 sdata->name, hdr.addr1); 2965 #endif 2966 2967 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2968 2969 ret = -EPERM; 2970 goto free; 2971 } 2972 2973 if (unlikely(!multicast && 2974 (sk_requests_wifi_status(skb->sk) || 2975 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2976 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2977 cookie); 2978 2979 /* 2980 * If the skb is shared we need to obtain our own copy. 2981 */ 2982 skb = skb_share_check(skb, GFP_ATOMIC); 2983 if (unlikely(!skb)) { 2984 /* skb_share_check() already freed the skb */ 2985 if (info_id) 2986 ieee80211_remove_ack_skb(local, info_id); 2987 return ERR_PTR(-ENOMEM); 2988 } 2989 2990 /* set this up so failure paths can clean up ack skb */ 2991 info = IEEE80211_SKB_CB(skb); 2992 memset(info, 0, sizeof(*info)); 2993 2994 info->flags = info_flags; 2995 if (info_id) { 2996 info->status_data = info_id; 2997 info->status_data_idr = 1; 2998 } 2999 info->band = band; 3000 3001 hdr.frame_control = fc; 3002 hdr.duration_id = 0; 3003 hdr.seq_ctrl = 0; 3004 3005 skip_header_bytes = ETH_HLEN; 3006 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 3007 encaps_data = bridge_tunnel_header; 3008 encaps_len = sizeof(bridge_tunnel_header); 3009 skip_header_bytes -= 2; 3010 } else if (ethertype >= ETH_P_802_3_MIN) { 3011 encaps_data = rfc1042_header; 3012 encaps_len = sizeof(rfc1042_header); 3013 skip_header_bytes -= 2; 3014 } else { 3015 encaps_data = NULL; 3016 encaps_len = 0; 3017 } 3018 3019 skb_pull(skb, skip_header_bytes); 3020 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 3021 3022 /* 3023 * So we need to modify the skb header and hence need a copy of 3024 * that. The head_need variable above doesn't, so far, include 3025 * the needed header space that we don't need right away. If we 3026 * can, then we don't reallocate right now but only after the 3027 * frame arrives at the master device (if it does...) 3028 * 3029 * If we cannot, however, then we will reallocate to include all 3030 * the ever needed space. Also, if we need to reallocate it anyway, 3031 * make it big enough for everything we may ever need. 3032 */ 3033 3034 if (head_need > 0 || skb_cloned(skb)) { 3035 head_need += IEEE80211_ENCRYPT_HEADROOM; 3036 head_need += local->tx_headroom; 3037 head_need = max_t(int, 0, head_need); 3038 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 3039 ret = -ENOMEM; 3040 goto free_txskb; 3041 } 3042 } 3043 3044 if (encaps_data) 3045 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 3046 3047 #ifdef CONFIG_MAC80211_MESH 3048 if (meshhdrlen > 0) 3049 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 3050 #endif 3051 3052 if (ieee80211_is_data_qos(fc)) { 3053 __le16 *qos_control; 3054 3055 qos_control = skb_push(skb, 2); 3056 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 3057 /* 3058 * Maybe we could actually set some fields here, for now just 3059 * initialise to zero to indicate no special operation. 3060 */ 3061 *qos_control = 0; 3062 } else 3063 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 3064 3065 skb_reset_mac_header(skb); 3066 3067 if (likely(!cookie)) { 3068 ctrl_flags |= u32_encode_bits(link_id, 3069 IEEE80211_TX_CTRL_MLO_LINK); 3070 } else { 3071 unsigned int pre_conf_link_id; 3072 3073 /* 3074 * ctrl_flags already have been set by 3075 * ieee80211_tx_control_port(), here 3076 * we just sanity check that 3077 */ 3078 3079 pre_conf_link_id = u32_get_bits(ctrl_flags, 3080 IEEE80211_TX_CTRL_MLO_LINK); 3081 3082 if (pre_conf_link_id != link_id && 3083 link_id != IEEE80211_LINK_UNSPECIFIED) { 3084 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 3085 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 3086 sdata->name, hdr.addr1, 3087 pre_conf_link_id, link_id); 3088 #endif 3089 ret = -EINVAL; 3090 goto free_txskb; 3091 } 3092 } 3093 3094 info->control.flags = ctrl_flags; 3095 3096 return skb; 3097 free_txskb: 3098 ieee80211_free_txskb(&local->hw, skb); 3099 return ERR_PTR(ret); 3100 free: 3101 kfree_skb(skb); 3102 return ERR_PTR(ret); 3103 } 3104 3105 /* 3106 * fast-xmit overview 3107 * 3108 * The core idea of this fast-xmit is to remove per-packet checks by checking 3109 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3110 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3111 * much less work can be done per packet. For example, fragmentation must be 3112 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3113 * in the code here. 3114 * 3115 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3116 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3117 * 3118 * The most difficult part of this is that when any of these assumptions 3119 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3120 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3121 * since the per-packet code no longer checks the conditions. This is reflected 3122 * by the calls to these functions throughout the rest of the code, and must be 3123 * maintained if any of the TX path checks change. 3124 */ 3125 3126 void ieee80211_check_fast_xmit(struct sta_info *sta) 3127 { 3128 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3129 struct ieee80211_local *local = sta->local; 3130 struct ieee80211_sub_if_data *sdata = sta->sdata; 3131 struct ieee80211_hdr *hdr = (void *)build.hdr; 3132 struct ieee80211_chanctx_conf *chanctx_conf; 3133 __le16 fc; 3134 3135 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3136 return; 3137 3138 if (ieee80211_vif_is_mesh(&sdata->vif)) 3139 mesh_fast_tx_flush_sta(sdata, sta); 3140 3141 /* Locking here protects both the pointer itself, and against concurrent 3142 * invocations winning data access races to, e.g., the key pointer that 3143 * is used. 3144 * Without it, the invocation of this function right after the key 3145 * pointer changes wouldn't be sufficient, as another CPU could access 3146 * the pointer, then stall, and then do the cache update after the CPU 3147 * that invalidated the key. 3148 * With the locking, such scenarios cannot happen as the check for the 3149 * key and the fast-tx assignment are done atomically, so the CPU that 3150 * modifies the key will either wait or other one will see the key 3151 * cleared/changed already. 3152 */ 3153 spin_lock_bh(&sta->lock); 3154 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3155 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3156 sdata->vif.type == NL80211_IFTYPE_STATION) 3157 goto out; 3158 3159 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3160 goto out; 3161 3162 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3163 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3164 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3165 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3166 goto out; 3167 3168 if (sdata->noack_map) 3169 goto out; 3170 3171 /* fast-xmit doesn't handle fragmentation at all */ 3172 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3173 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3174 goto out; 3175 3176 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3177 rcu_read_lock(); 3178 chanctx_conf = 3179 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3180 if (!chanctx_conf) { 3181 rcu_read_unlock(); 3182 goto out; 3183 } 3184 build.band = chanctx_conf->def.chan->band; 3185 rcu_read_unlock(); 3186 } else { 3187 /* MLD transmissions must not rely on the band */ 3188 build.band = 0; 3189 } 3190 3191 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3192 3193 switch (sdata->vif.type) { 3194 case NL80211_IFTYPE_ADHOC: 3195 /* DA SA BSSID */ 3196 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3197 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3198 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3199 build.hdr_len = 24; 3200 break; 3201 case NL80211_IFTYPE_STATION: 3202 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3203 /* For TDLS only one link can be valid with peer STA */ 3204 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3205 struct ieee80211_link_data *link; 3206 3207 /* DA SA BSSID */ 3208 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3209 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3210 rcu_read_lock(); 3211 link = rcu_dereference(sdata->link[tdls_link_id]); 3212 if (!WARN_ON_ONCE(!link)) 3213 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3214 rcu_read_unlock(); 3215 build.hdr_len = 24; 3216 break; 3217 } 3218 3219 if (sdata->u.mgd.use_4addr) { 3220 /* non-regular ethertype cannot use the fastpath */ 3221 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3222 IEEE80211_FCTL_TODS); 3223 /* RA TA DA SA */ 3224 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3225 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3226 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3227 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3228 build.hdr_len = 30; 3229 break; 3230 } 3231 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3232 /* BSSID SA DA */ 3233 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3234 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3235 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3236 build.hdr_len = 24; 3237 break; 3238 case NL80211_IFTYPE_AP_VLAN: 3239 if (sdata->wdev.use_4addr) { 3240 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3241 IEEE80211_FCTL_TODS); 3242 /* RA TA DA SA */ 3243 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3244 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3245 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3246 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3247 build.hdr_len = 30; 3248 break; 3249 } 3250 fallthrough; 3251 case NL80211_IFTYPE_AP: 3252 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3253 /* DA BSSID SA */ 3254 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3255 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3256 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3257 } else { 3258 unsigned int link_id = sta->deflink.link_id; 3259 struct ieee80211_link_data *link; 3260 3261 rcu_read_lock(); 3262 link = rcu_dereference(sdata->link[link_id]); 3263 if (WARN_ON(!link)) { 3264 rcu_read_unlock(); 3265 goto out; 3266 } 3267 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3268 rcu_read_unlock(); 3269 } 3270 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3271 build.hdr_len = 24; 3272 break; 3273 default: 3274 /* not handled on fast-xmit */ 3275 goto out; 3276 } 3277 3278 if (sta->sta.wme) { 3279 build.hdr_len += 2; 3280 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3281 } 3282 3283 /* We store the key here so there's no point in using rcu_dereference() 3284 * but that's fine because the code that changes the pointers will call 3285 * this function after doing so. For a single CPU that would be enough, 3286 * for multiple see the comment above. 3287 */ 3288 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3289 if (!build.key) 3290 build.key = rcu_access_pointer(sdata->default_unicast_key); 3291 if (build.key) { 3292 bool gen_iv, iv_spc, mmic; 3293 3294 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3295 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3296 mmic = build.key->conf.flags & 3297 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3298 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3299 3300 /* don't handle software crypto */ 3301 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3302 goto out; 3303 3304 /* Key is being removed */ 3305 if (build.key->flags & KEY_FLAG_TAINTED) 3306 goto out; 3307 3308 switch (build.key->conf.cipher) { 3309 case WLAN_CIPHER_SUITE_CCMP: 3310 case WLAN_CIPHER_SUITE_CCMP_256: 3311 if (gen_iv) 3312 build.pn_offs = build.hdr_len; 3313 if (gen_iv || iv_spc) 3314 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3315 break; 3316 case WLAN_CIPHER_SUITE_GCMP: 3317 case WLAN_CIPHER_SUITE_GCMP_256: 3318 if (gen_iv) 3319 build.pn_offs = build.hdr_len; 3320 if (gen_iv || iv_spc) 3321 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3322 break; 3323 case WLAN_CIPHER_SUITE_TKIP: 3324 /* cannot handle MMIC or IV generation in xmit-fast */ 3325 if (mmic || gen_iv) 3326 goto out; 3327 if (iv_spc) 3328 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3329 break; 3330 case WLAN_CIPHER_SUITE_WEP40: 3331 case WLAN_CIPHER_SUITE_WEP104: 3332 /* cannot handle IV generation in fast-xmit */ 3333 if (gen_iv) 3334 goto out; 3335 if (iv_spc) 3336 build.hdr_len += IEEE80211_WEP_IV_LEN; 3337 break; 3338 case WLAN_CIPHER_SUITE_AES_CMAC: 3339 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3340 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3341 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3342 WARN(1, 3343 "management cipher suite 0x%x enabled for data\n", 3344 build.key->conf.cipher); 3345 goto out; 3346 default: 3347 /* we don't know how to generate IVs for this at all */ 3348 if (WARN_ON(gen_iv)) 3349 goto out; 3350 } 3351 3352 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3353 } 3354 3355 hdr->frame_control = fc; 3356 3357 memcpy(build.hdr + build.hdr_len, 3358 rfc1042_header, sizeof(rfc1042_header)); 3359 build.hdr_len += sizeof(rfc1042_header); 3360 3361 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3362 /* if the kmemdup fails, continue w/o fast_tx */ 3363 3364 out: 3365 /* we might have raced against another call to this function */ 3366 old = rcu_dereference_protected(sta->fast_tx, 3367 lockdep_is_held(&sta->lock)); 3368 rcu_assign_pointer(sta->fast_tx, fast_tx); 3369 if (old) 3370 kfree_rcu(old, rcu_head); 3371 spin_unlock_bh(&sta->lock); 3372 } 3373 3374 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3375 { 3376 struct sta_info *sta; 3377 3378 rcu_read_lock(); 3379 list_for_each_entry_rcu(sta, &local->sta_list, list) 3380 ieee80211_check_fast_xmit(sta); 3381 rcu_read_unlock(); 3382 } 3383 3384 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3385 { 3386 struct ieee80211_local *local = sdata->local; 3387 struct sta_info *sta; 3388 3389 rcu_read_lock(); 3390 3391 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3392 if (sdata != sta->sdata && 3393 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3394 continue; 3395 ieee80211_check_fast_xmit(sta); 3396 } 3397 3398 rcu_read_unlock(); 3399 } 3400 3401 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3402 { 3403 struct ieee80211_fast_tx *fast_tx; 3404 3405 spin_lock_bh(&sta->lock); 3406 fast_tx = rcu_dereference_protected(sta->fast_tx, 3407 lockdep_is_held(&sta->lock)); 3408 RCU_INIT_POINTER(sta->fast_tx, NULL); 3409 spin_unlock_bh(&sta->lock); 3410 3411 if (fast_tx) 3412 kfree_rcu(fast_tx, rcu_head); 3413 } 3414 3415 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3416 struct sk_buff *skb, int headroom) 3417 { 3418 if (skb_headroom(skb) < headroom) { 3419 I802_DEBUG_INC(local->tx_expand_skb_head); 3420 3421 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3422 wiphy_debug(local->hw.wiphy, 3423 "failed to reallocate TX buffer\n"); 3424 return false; 3425 } 3426 } 3427 3428 return true; 3429 } 3430 3431 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3432 struct ieee80211_fast_tx *fast_tx, 3433 struct sk_buff *skb) 3434 { 3435 struct ieee80211_local *local = sdata->local; 3436 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3437 struct ieee80211_hdr *hdr; 3438 struct ethhdr *amsdu_hdr; 3439 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3440 int subframe_len = skb->len - hdr_len; 3441 void *data; 3442 u8 *qc, *h_80211_src, *h_80211_dst; 3443 const u8 *bssid; 3444 3445 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3446 return false; 3447 3448 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3449 return true; 3450 3451 if (!ieee80211_amsdu_realloc_pad(local, skb, 3452 sizeof(*amsdu_hdr) + 3453 local->hw.extra_tx_headroom)) 3454 return false; 3455 3456 data = skb_push(skb, sizeof(*amsdu_hdr)); 3457 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3458 hdr = data; 3459 amsdu_hdr = data + hdr_len; 3460 /* h_80211_src/dst is addr* field within hdr */ 3461 h_80211_src = data + fast_tx->sa_offs; 3462 h_80211_dst = data + fast_tx->da_offs; 3463 3464 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3465 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3466 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3467 3468 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3469 * fields needs to be changed to BSSID for A-MSDU frames depending 3470 * on FromDS/ToDS values. 3471 */ 3472 switch (sdata->vif.type) { 3473 case NL80211_IFTYPE_STATION: 3474 bssid = sdata->vif.cfg.ap_addr; 3475 break; 3476 case NL80211_IFTYPE_AP: 3477 case NL80211_IFTYPE_AP_VLAN: 3478 bssid = sdata->vif.addr; 3479 break; 3480 default: 3481 bssid = NULL; 3482 } 3483 3484 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3485 ether_addr_copy(h_80211_src, bssid); 3486 3487 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3488 ether_addr_copy(h_80211_dst, bssid); 3489 3490 qc = ieee80211_get_qos_ctl(hdr); 3491 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3492 3493 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3494 3495 return true; 3496 } 3497 3498 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3499 struct sta_info *sta, 3500 struct ieee80211_fast_tx *fast_tx, 3501 struct sk_buff *skb, 3502 const u8 *da, const u8 *sa) 3503 { 3504 struct ieee80211_local *local = sdata->local; 3505 struct fq *fq = &local->fq; 3506 struct fq_tin *tin; 3507 struct fq_flow *flow; 3508 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3509 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3510 struct txq_info *txqi; 3511 struct sk_buff **frag_tail, *head; 3512 int subframe_len = skb->len - ETH_ALEN; 3513 u8 max_subframes = sta->sta.max_amsdu_subframes; 3514 int max_frags = local->hw.max_tx_fragments; 3515 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3516 int orig_truesize; 3517 u32 flow_idx; 3518 __be16 len; 3519 void *data; 3520 bool ret = false; 3521 unsigned int orig_len; 3522 int n = 2, nfrags, pad = 0; 3523 u16 hdrlen; 3524 3525 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3526 return false; 3527 3528 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3529 return false; 3530 3531 if (ieee80211_vif_is_mesh(&sdata->vif)) 3532 return false; 3533 3534 if (skb_is_gso(skb)) 3535 return false; 3536 3537 if (!txq) 3538 return false; 3539 3540 txqi = to_txq_info(txq); 3541 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3542 return false; 3543 3544 if (sta->sta.cur->max_rc_amsdu_len) 3545 max_amsdu_len = min_t(int, max_amsdu_len, 3546 sta->sta.cur->max_rc_amsdu_len); 3547 3548 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3549 max_amsdu_len = min_t(int, max_amsdu_len, 3550 sta->sta.cur->max_tid_amsdu_len[tid]); 3551 3552 flow_idx = fq_flow_idx(fq, skb); 3553 3554 spin_lock_bh(&fq->lock); 3555 3556 /* TODO: Ideally aggregation should be done on dequeue to remain 3557 * responsive to environment changes. 3558 */ 3559 3560 tin = &txqi->tin; 3561 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3562 head = skb_peek_tail(&flow->queue); 3563 if (!head || skb_is_gso(head)) 3564 goto out; 3565 3566 orig_truesize = head->truesize; 3567 orig_len = head->len; 3568 3569 if (skb->len + head->len > max_amsdu_len) 3570 goto out; 3571 3572 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3573 nfrags += 1 + skb_shinfo(head)->nr_frags; 3574 frag_tail = &skb_shinfo(head)->frag_list; 3575 while (*frag_tail) { 3576 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3577 frag_tail = &(*frag_tail)->next; 3578 n++; 3579 } 3580 3581 if (max_subframes && n > max_subframes) 3582 goto out; 3583 3584 if (max_frags && nfrags > max_frags) 3585 goto out; 3586 3587 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3588 goto out; 3589 3590 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3591 goto out; 3592 3593 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3594 * and frag_tail should be &skb_shinfo(head)->frag_list. 3595 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3596 * Reload frag_tail to have it pointing to the correct place. 3597 */ 3598 if (n == 2) 3599 frag_tail = &skb_shinfo(head)->frag_list; 3600 3601 /* 3602 * Pad out the previous subframe to a multiple of 4 by adding the 3603 * padding to the next one, that's being added. Note that head->len 3604 * is the length of the full A-MSDU, but that works since each time 3605 * we add a new subframe we pad out the previous one to a multiple 3606 * of 4 and thus it no longer matters in the next round. 3607 */ 3608 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3609 if ((head->len - hdrlen) & 3) 3610 pad = 4 - ((head->len - hdrlen) & 3); 3611 3612 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3613 2 + pad)) 3614 goto out_recalc; 3615 3616 ret = true; 3617 data = skb_push(skb, ETH_ALEN + 2); 3618 ether_addr_copy(data, da); 3619 ether_addr_copy(data + ETH_ALEN, sa); 3620 3621 data += 2 * ETH_ALEN; 3622 len = cpu_to_be16(subframe_len); 3623 memcpy(data, &len, 2); 3624 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3625 3626 memset(skb_push(skb, pad), 0, pad); 3627 3628 head->len += skb->len; 3629 head->data_len += skb->len; 3630 *frag_tail = skb; 3631 3632 out_recalc: 3633 fq->memory_usage += head->truesize - orig_truesize; 3634 if (head->len != orig_len) { 3635 flow->backlog += head->len - orig_len; 3636 tin->backlog_bytes += head->len - orig_len; 3637 } 3638 out: 3639 spin_unlock_bh(&fq->lock); 3640 3641 return ret; 3642 } 3643 3644 /* 3645 * Can be called while the sta lock is held. Anything that can cause packets to 3646 * be generated will cause deadlock! 3647 */ 3648 static ieee80211_tx_result 3649 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3650 struct sta_info *sta, u8 pn_offs, 3651 struct ieee80211_key *key, 3652 struct ieee80211_tx_data *tx) 3653 { 3654 struct sk_buff *skb = tx->skb; 3655 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3656 struct ieee80211_hdr *hdr = (void *)skb->data; 3657 u8 tid = IEEE80211_NUM_TIDS; 3658 3659 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3660 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3661 return TX_DROP; 3662 3663 if (key) 3664 info->control.hw_key = &key->conf; 3665 3666 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3667 3668 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3669 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3670 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3671 } else { 3672 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3673 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3674 sdata->sequence_number += 0x10; 3675 } 3676 3677 if (skb_shinfo(skb)->gso_size) 3678 sta->deflink.tx_stats.msdu[tid] += 3679 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3680 else 3681 sta->deflink.tx_stats.msdu[tid]++; 3682 3683 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3684 3685 /* statistics normally done by ieee80211_tx_h_stats (but that 3686 * has to consider fragmentation, so is more complex) 3687 */ 3688 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3689 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3690 3691 if (pn_offs) { 3692 u64 pn; 3693 u8 *crypto_hdr = skb->data + pn_offs; 3694 3695 switch (key->conf.cipher) { 3696 case WLAN_CIPHER_SUITE_CCMP: 3697 case WLAN_CIPHER_SUITE_CCMP_256: 3698 case WLAN_CIPHER_SUITE_GCMP: 3699 case WLAN_CIPHER_SUITE_GCMP_256: 3700 pn = atomic64_inc_return(&key->conf.tx_pn); 3701 crypto_hdr[0] = pn; 3702 crypto_hdr[1] = pn >> 8; 3703 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3704 crypto_hdr[4] = pn >> 16; 3705 crypto_hdr[5] = pn >> 24; 3706 crypto_hdr[6] = pn >> 32; 3707 crypto_hdr[7] = pn >> 40; 3708 break; 3709 } 3710 } 3711 3712 return TX_CONTINUE; 3713 } 3714 3715 static netdev_features_t 3716 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3717 { 3718 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3719 return sdata->vif.netdev_features; 3720 3721 if (!sdata->bss) 3722 return 0; 3723 3724 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3725 return sdata->vif.netdev_features; 3726 } 3727 3728 static struct sk_buff * 3729 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3730 { 3731 if (skb_is_gso(skb)) { 3732 struct sk_buff *segs; 3733 3734 segs = skb_gso_segment(skb, features); 3735 if (!segs) 3736 return skb; 3737 if (IS_ERR(segs)) 3738 goto free; 3739 3740 consume_skb(skb); 3741 return segs; 3742 } 3743 3744 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3745 goto free; 3746 3747 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3748 int ofs = skb_checksum_start_offset(skb); 3749 3750 if (skb->encapsulation) 3751 skb_set_inner_transport_header(skb, ofs); 3752 else 3753 skb_set_transport_header(skb, ofs); 3754 3755 if (skb_csum_hwoffload_help(skb, features)) 3756 goto free; 3757 } 3758 3759 skb_mark_not_on_list(skb); 3760 return skb; 3761 3762 free: 3763 kfree_skb(skb); 3764 return NULL; 3765 } 3766 3767 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3768 struct sta_info *sta, 3769 struct ieee80211_fast_tx *fast_tx, 3770 struct sk_buff *skb, bool ampdu, 3771 const u8 *da, const u8 *sa) 3772 { 3773 struct ieee80211_local *local = sdata->local; 3774 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3775 struct ieee80211_tx_info *info; 3776 struct ieee80211_tx_data tx; 3777 ieee80211_tx_result r; 3778 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3779 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3780 3781 skb = skb_share_check(skb, GFP_ATOMIC); 3782 if (unlikely(!skb)) 3783 return; 3784 3785 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3786 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3787 return; 3788 3789 /* will not be crypto-handled beyond what we do here, so use false 3790 * as the may-encrypt argument for the resize to not account for 3791 * more room than we already have in 'extra_head' 3792 */ 3793 if (unlikely(ieee80211_skb_resize(sdata, skb, 3794 max_t(int, extra_head + hw_headroom - 3795 skb_headroom(skb), 0), 3796 ENCRYPT_NO))) 3797 goto free; 3798 3799 hdr = skb_push(skb, extra_head); 3800 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3801 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3802 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3803 3804 info = IEEE80211_SKB_CB(skb); 3805 memset(info, 0, sizeof(*info)); 3806 info->band = fast_tx->band; 3807 info->control.vif = &sdata->vif; 3808 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3809 IEEE80211_TX_CTL_DONTFRAG; 3810 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3811 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3812 IEEE80211_TX_CTRL_MLO_LINK); 3813 3814 #ifdef CONFIG_MAC80211_DEBUGFS 3815 if (local->force_tx_status) 3816 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3817 #endif 3818 3819 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3820 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3821 3822 *ieee80211_get_qos_ctl(hdr) = tid; 3823 } 3824 3825 __skb_queue_head_init(&tx.skbs); 3826 3827 tx.flags = IEEE80211_TX_UNICAST; 3828 tx.local = local; 3829 tx.sdata = sdata; 3830 tx.sta = sta; 3831 tx.key = fast_tx->key; 3832 3833 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3834 return; 3835 3836 tx.skb = skb; 3837 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3838 fast_tx->key, &tx); 3839 tx.skb = NULL; 3840 if (r == TX_DROP) { 3841 tx.sdata->tx_handlers_drop++; 3842 goto free; 3843 } 3844 3845 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3846 sdata = container_of(sdata->bss, 3847 struct ieee80211_sub_if_data, u.ap); 3848 3849 __skb_queue_tail(&tx.skbs, skb); 3850 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3851 return; 3852 3853 free: 3854 kfree_skb(skb); 3855 } 3856 3857 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3858 struct sta_info *sta, 3859 struct ieee80211_fast_tx *fast_tx, 3860 struct sk_buff *skb) 3861 { 3862 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3863 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3864 struct tid_ampdu_tx *tid_tx = NULL; 3865 struct sk_buff *next; 3866 struct ethhdr eth; 3867 u8 tid = IEEE80211_NUM_TIDS; 3868 3869 /* control port protocol needs a lot of special handling */ 3870 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3871 return false; 3872 3873 /* only RFC 1042 SNAP */ 3874 if (ethertype < ETH_P_802_3_MIN) 3875 return false; 3876 3877 /* don't handle TX status request here either */ 3878 if (sk_requests_wifi_status(skb->sk)) 3879 return false; 3880 3881 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3882 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3883 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3884 if (tid_tx) { 3885 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3886 return false; 3887 if (tid_tx->timeout) 3888 tid_tx->last_tx = jiffies; 3889 } 3890 } 3891 3892 memcpy(ð, skb->data, ETH_HLEN - 2); 3893 3894 /* after this point (skb is modified) we cannot return false */ 3895 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3896 if (!skb) 3897 return true; 3898 3899 skb_list_walk_safe(skb, skb, next) { 3900 skb_mark_not_on_list(skb); 3901 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3902 eth.h_dest, eth.h_source); 3903 } 3904 3905 return true; 3906 } 3907 3908 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3909 struct ieee80211_txq *txq) 3910 { 3911 struct ieee80211_local *local = hw_to_local(hw); 3912 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3913 struct ieee80211_hdr *hdr; 3914 struct sk_buff *skb = NULL; 3915 struct fq *fq = &local->fq; 3916 struct fq_tin *tin = &txqi->tin; 3917 struct ieee80211_tx_info *info; 3918 struct ieee80211_tx_data tx; 3919 ieee80211_tx_result r; 3920 struct ieee80211_vif *vif = txq->vif; 3921 int q = vif->hw_queue[txq->ac]; 3922 unsigned long flags; 3923 bool q_stopped; 3924 3925 WARN_ON_ONCE(softirq_count() == 0); 3926 3927 if (!ieee80211_txq_airtime_check(hw, txq)) 3928 return NULL; 3929 3930 begin: 3931 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3932 q_stopped = local->queue_stop_reasons[q]; 3933 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3934 3935 if (unlikely(q_stopped)) { 3936 /* mark for waking later */ 3937 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3938 return NULL; 3939 } 3940 3941 spin_lock_bh(&fq->lock); 3942 3943 /* Make sure fragments stay together. */ 3944 skb = __skb_dequeue(&txqi->frags); 3945 if (unlikely(skb)) { 3946 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3947 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3948 goto out; 3949 IEEE80211_SKB_CB(skb)->control.flags &= 3950 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3951 } else { 3952 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3953 goto out; 3954 3955 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3956 } 3957 3958 if (!skb) 3959 goto out; 3960 3961 spin_unlock_bh(&fq->lock); 3962 3963 hdr = (struct ieee80211_hdr *)skb->data; 3964 info = IEEE80211_SKB_CB(skb); 3965 3966 memset(&tx, 0, sizeof(tx)); 3967 __skb_queue_head_init(&tx.skbs); 3968 tx.local = local; 3969 tx.skb = skb; 3970 tx.sdata = vif_to_sdata(info->control.vif); 3971 3972 if (txq->sta) { 3973 tx.sta = container_of(txq->sta, struct sta_info, sta); 3974 /* 3975 * Drop unicast frames to unauthorised stations unless they are 3976 * injected frames or EAPOL frames from the local station. 3977 */ 3978 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3979 ieee80211_is_data_present(hdr->frame_control) && 3980 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3981 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3982 !is_multicast_ether_addr(hdr->addr1) && 3983 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3984 (!(info->control.flags & 3985 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3986 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3987 NULL)))) { 3988 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3989 ieee80211_free_txskb(&local->hw, skb); 3990 goto begin; 3991 } 3992 } 3993 3994 /* 3995 * The key can be removed while the packet was queued, so need to call 3996 * this here to get the current key. 3997 */ 3998 info->control.hw_key = NULL; 3999 r = ieee80211_tx_h_select_key(&tx); 4000 if (r != TX_CONTINUE) { 4001 ieee80211_free_txskb(&local->hw, skb); 4002 goto begin; 4003 } 4004 4005 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 4006 info->flags |= (IEEE80211_TX_CTL_AMPDU | 4007 IEEE80211_TX_CTL_DONTFRAG); 4008 4009 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4010 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 4011 r = ieee80211_tx_h_rate_ctrl(&tx); 4012 if (r != TX_CONTINUE) { 4013 ieee80211_free_txskb(&local->hw, skb); 4014 goto begin; 4015 } 4016 } 4017 goto encap_out; 4018 } 4019 4020 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 4021 struct sta_info *sta = container_of(txq->sta, struct sta_info, 4022 sta); 4023 u8 pn_offs = 0; 4024 4025 if (tx.key && 4026 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 4027 pn_offs = ieee80211_hdrlen(hdr->frame_control); 4028 4029 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 4030 tx.key, &tx); 4031 if (r != TX_CONTINUE) { 4032 ieee80211_free_txskb(&local->hw, skb); 4033 goto begin; 4034 } 4035 } else { 4036 if (invoke_tx_handlers_late(&tx)) 4037 goto begin; 4038 4039 skb = __skb_dequeue(&tx.skbs); 4040 info = IEEE80211_SKB_CB(skb); 4041 4042 if (!skb_queue_empty(&tx.skbs)) { 4043 spin_lock_bh(&fq->lock); 4044 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 4045 spin_unlock_bh(&fq->lock); 4046 } 4047 } 4048 4049 if (skb_has_frag_list(skb) && 4050 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 4051 if (skb_linearize(skb)) { 4052 ieee80211_free_txskb(&local->hw, skb); 4053 goto begin; 4054 } 4055 } 4056 4057 switch (tx.sdata->vif.type) { 4058 case NL80211_IFTYPE_MONITOR: 4059 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 4060 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 4061 vif = &tx.sdata->vif; 4062 break; 4063 } 4064 tx.sdata = rcu_dereference(local->monitor_sdata); 4065 if (tx.sdata && 4066 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 4067 vif = &tx.sdata->vif; 4068 info->hw_queue = 4069 vif->hw_queue[skb_get_queue_mapping(skb)]; 4070 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 4071 ieee80211_free_txskb(&local->hw, skb); 4072 goto begin; 4073 } else { 4074 info->control.vif = NULL; 4075 return skb; 4076 } 4077 break; 4078 case NL80211_IFTYPE_AP_VLAN: 4079 tx.sdata = container_of(tx.sdata->bss, 4080 struct ieee80211_sub_if_data, u.ap); 4081 fallthrough; 4082 default: 4083 vif = &tx.sdata->vif; 4084 break; 4085 } 4086 4087 encap_out: 4088 info->control.vif = vif; 4089 4090 if (wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 4091 bool ampdu = txq->sta && txq->ac != IEEE80211_AC_VO; 4092 u32 airtime; 4093 4094 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 4095 skb->len, ampdu); 4096 if (!airtime) 4097 return skb; 4098 4099 airtime = ieee80211_info_set_tx_time_est(info, airtime); 4100 info->tx_time_mc = !tx.sta; 4101 ieee80211_sta_update_pending_airtime(local, tx.sta, txq->ac, 4102 airtime, false, 4103 info->tx_time_mc); 4104 } 4105 4106 return skb; 4107 4108 out: 4109 spin_unlock_bh(&fq->lock); 4110 4111 return skb; 4112 } 4113 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4114 4115 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4116 { 4117 struct airtime_info *air_info = &sta->airtime[ac]; 4118 4119 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4120 } 4121 4122 static void 4123 ieee80211_txq_set_active(struct txq_info *txqi) 4124 { 4125 struct sta_info *sta; 4126 4127 if (!txqi->txq.sta) 4128 return; 4129 4130 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4131 sta->airtime[txqi->txq.ac].last_active = jiffies; 4132 } 4133 4134 static bool 4135 ieee80211_txq_keep_active(struct txq_info *txqi) 4136 { 4137 struct sta_info *sta; 4138 4139 if (!txqi->txq.sta) 4140 return false; 4141 4142 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4143 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4144 return false; 4145 4146 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4147 } 4148 4149 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4150 { 4151 struct ieee80211_local *local = hw_to_local(hw); 4152 struct ieee80211_txq *ret = NULL; 4153 struct txq_info *txqi = NULL, *head = NULL; 4154 bool found_eligible_txq = false; 4155 bool aql_check; 4156 4157 spin_lock_bh(&local->active_txq_lock[ac]); 4158 4159 if (!local->schedule_round[ac]) 4160 goto out; 4161 4162 begin: 4163 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4164 struct txq_info, 4165 schedule_order); 4166 if (!txqi) 4167 goto out; 4168 4169 if (txqi == head) { 4170 if (!found_eligible_txq) 4171 goto out; 4172 else 4173 found_eligible_txq = false; 4174 } 4175 4176 if (!head) 4177 head = txqi; 4178 4179 aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4180 if (aql_check) 4181 found_eligible_txq = true; 4182 4183 if (txqi->txq.sta) { 4184 struct sta_info *sta = container_of(txqi->txq.sta, 4185 struct sta_info, sta); 4186 4187 if (ieee80211_sta_deficit(sta, txqi->txq.ac) < 0) { 4188 sta->airtime[txqi->txq.ac].deficit += 4189 sta->airtime_weight; 4190 4191 aql_check = false; 4192 } 4193 } 4194 4195 if (!aql_check) { 4196 list_move_tail(&txqi->schedule_order, 4197 &local->active_txqs[txqi->txq.ac]); 4198 goto begin; 4199 } 4200 4201 if (txqi->schedule_round == local->schedule_round[ac]) 4202 goto out; 4203 4204 list_del_init(&txqi->schedule_order); 4205 txqi->schedule_round = local->schedule_round[ac]; 4206 ret = &txqi->txq; 4207 4208 out: 4209 spin_unlock_bh(&local->active_txq_lock[ac]); 4210 return ret; 4211 } 4212 EXPORT_SYMBOL(ieee80211_next_txq); 4213 4214 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4215 struct ieee80211_txq *txq, 4216 bool force) 4217 { 4218 struct ieee80211_local *local = hw_to_local(hw); 4219 struct txq_info *txqi = to_txq_info(txq); 4220 bool has_queue; 4221 4222 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4223 4224 has_queue = force || 4225 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4226 txq_has_queue(txq)); 4227 if (list_empty(&txqi->schedule_order) && 4228 (has_queue || ieee80211_txq_keep_active(txqi))) { 4229 /* If airtime accounting is active, always enqueue STAs at the 4230 * head of the list to ensure that they only get moved to the 4231 * back by the airtime DRR scheduler once they have a negative 4232 * deficit. A station that already has a negative deficit will 4233 * get immediately moved to the back of the list on the next 4234 * call to ieee80211_next_txq(). 4235 */ 4236 if (txqi->txq.sta && local->airtime_flags && has_queue && 4237 wiphy_ext_feature_isset(local->hw.wiphy, 4238 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4239 list_add(&txqi->schedule_order, 4240 &local->active_txqs[txq->ac]); 4241 else 4242 list_add_tail(&txqi->schedule_order, 4243 &local->active_txqs[txq->ac]); 4244 if (has_queue) 4245 ieee80211_txq_set_active(txqi); 4246 } 4247 4248 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4249 } 4250 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4251 4252 DEFINE_STATIC_KEY_FALSE(aql_disable); 4253 4254 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4255 struct ieee80211_txq *txq) 4256 { 4257 struct sta_info *sta; 4258 struct ieee80211_local *local = hw_to_local(hw); 4259 4260 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4261 return true; 4262 4263 if (static_branch_unlikely(&aql_disable)) 4264 return true; 4265 4266 if (!txq->sta) 4267 return atomic_read(&local->aql_mc_pending_airtime) < 4268 local->aql_txq_limit_mc; 4269 4270 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4271 return true; 4272 4273 sta = container_of(txq->sta, struct sta_info, sta); 4274 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4275 sta->airtime[txq->ac].aql_limit_low) 4276 return true; 4277 4278 if (atomic_read(&local->aql_total_pending_airtime) < 4279 local->aql_threshold && 4280 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4281 sta->airtime[txq->ac].aql_limit_high) 4282 return true; 4283 4284 return false; 4285 } 4286 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4287 4288 u32 ieee80211_txq_aql_pending(struct ieee80211_hw *hw, 4289 struct ieee80211_txq *txq) 4290 { 4291 struct ieee80211_local *local = hw_to_local(hw); 4292 struct sta_info *sta; 4293 4294 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4295 return 0; 4296 4297 if (!txq->sta) 4298 return atomic_read(&local->aql_mc_pending_airtime); 4299 4300 sta = container_of(txq->sta, struct sta_info, sta); 4301 4302 return atomic_read(&sta->airtime[txq->ac].aql_tx_pending); 4303 } 4304 EXPORT_SYMBOL(ieee80211_txq_aql_pending); 4305 4306 static bool 4307 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4308 { 4309 unsigned int num_txq = 0; 4310 struct txq_info *txq; 4311 u32 aql_limit; 4312 4313 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4314 return true; 4315 4316 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4317 num_txq++; 4318 4319 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4320 local->aql_txq_limit_high[ac]; 4321 4322 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4323 } 4324 4325 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4326 struct ieee80211_txq *txq) 4327 { 4328 struct ieee80211_local *local = hw_to_local(hw); 4329 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4330 struct sta_info *sta; 4331 u8 ac = txq->ac; 4332 4333 spin_lock_bh(&local->active_txq_lock[ac]); 4334 4335 if (list_empty(&txqi->schedule_order)) 4336 goto out; 4337 4338 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4339 goto out; 4340 4341 if (!txqi->txq.sta) 4342 goto out; 4343 4344 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4345 schedule_order) { 4346 if (iter == txqi) 4347 break; 4348 4349 if (!iter->txq.sta) { 4350 list_move_tail(&iter->schedule_order, 4351 &local->active_txqs[ac]); 4352 continue; 4353 } 4354 sta = container_of(iter->txq.sta, struct sta_info, sta); 4355 if (ieee80211_sta_deficit(sta, ac) < 0) 4356 sta->airtime[ac].deficit += sta->airtime_weight; 4357 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4358 } 4359 4360 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4361 if (sta->airtime[ac].deficit >= 0) 4362 goto out; 4363 4364 sta->airtime[ac].deficit += sta->airtime_weight; 4365 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4366 spin_unlock_bh(&local->active_txq_lock[ac]); 4367 4368 return false; 4369 out: 4370 if (!list_empty(&txqi->schedule_order)) 4371 list_del_init(&txqi->schedule_order); 4372 spin_unlock_bh(&local->active_txq_lock[ac]); 4373 4374 return true; 4375 } 4376 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4377 4378 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4379 { 4380 struct ieee80211_local *local = hw_to_local(hw); 4381 4382 spin_lock_bh(&local->active_txq_lock[ac]); 4383 4384 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4385 local->schedule_round[ac]++; 4386 if (!local->schedule_round[ac]) 4387 local->schedule_round[ac]++; 4388 } else { 4389 local->schedule_round[ac] = 0; 4390 } 4391 4392 spin_unlock_bh(&local->active_txq_lock[ac]); 4393 } 4394 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4395 4396 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4397 struct net_device *dev, 4398 u32 info_flags, 4399 u32 ctrl_flags, 4400 u64 cookie) 4401 { 4402 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4403 struct ieee80211_local *local = sdata->local; 4404 struct sta_info *sta; 4405 struct sk_buff *next; 4406 int len = skb->len; 4407 4408 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4409 kfree_skb(skb); 4410 return; 4411 } 4412 4413 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4414 4415 rcu_read_lock(); 4416 4417 if (ieee80211_vif_is_mesh(&sdata->vif) && 4418 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4419 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4420 goto out; 4421 4422 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4423 goto out_free; 4424 4425 if (IS_ERR(sta)) 4426 sta = NULL; 4427 4428 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4429 ieee80211_aggr_check(sdata, sta, skb); 4430 4431 if (sta) { 4432 struct ieee80211_fast_tx *fast_tx; 4433 4434 fast_tx = rcu_dereference(sta->fast_tx); 4435 4436 if (fast_tx && 4437 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4438 goto out; 4439 } 4440 4441 /* the frame could be fragmented, software-encrypted, and other 4442 * things so we cannot really handle checksum or GSO offload. 4443 * fix it up in software before we handle anything else. 4444 */ 4445 skb = ieee80211_tx_skb_fixup(skb, 0); 4446 if (!skb) { 4447 len = 0; 4448 goto out; 4449 } 4450 4451 skb_list_walk_safe(skb, skb, next) { 4452 skb_mark_not_on_list(skb); 4453 4454 if (skb->protocol == sdata->control_port_protocol) 4455 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4456 4457 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4458 sta, ctrl_flags, cookie); 4459 if (IS_ERR(skb)) { 4460 kfree_skb_list(next); 4461 goto out; 4462 } 4463 4464 dev_sw_netstats_tx_add(dev, 1, skb->len); 4465 4466 ieee80211_xmit(sdata, sta, skb); 4467 } 4468 goto out; 4469 out_free: 4470 kfree_skb(skb); 4471 len = 0; 4472 out: 4473 if (len) 4474 ieee80211_tpt_led_trig_tx(local, len); 4475 rcu_read_unlock(); 4476 } 4477 4478 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4479 { 4480 struct ethhdr *eth; 4481 int err; 4482 4483 err = skb_ensure_writable(skb, ETH_HLEN); 4484 if (unlikely(err)) 4485 return err; 4486 4487 eth = (void *)skb->data; 4488 ether_addr_copy(eth->h_dest, sta->sta.addr); 4489 4490 return 0; 4491 } 4492 4493 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4494 struct net_device *dev) 4495 { 4496 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4497 const struct ethhdr *eth = (void *)skb->data; 4498 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4499 __be16 ethertype; 4500 4501 switch (sdata->vif.type) { 4502 case NL80211_IFTYPE_AP_VLAN: 4503 if (sdata->u.vlan.sta) 4504 return false; 4505 if (sdata->wdev.use_4addr) 4506 return false; 4507 fallthrough; 4508 case NL80211_IFTYPE_AP: 4509 /* check runtime toggle for this bss */ 4510 if (!sdata->bss->multicast_to_unicast) 4511 return false; 4512 break; 4513 default: 4514 return false; 4515 } 4516 4517 /* multicast to unicast conversion only for some payload */ 4518 ethertype = eth->h_proto; 4519 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4520 ethertype = ethvlan->h_vlan_encapsulated_proto; 4521 switch (ethertype) { 4522 case htons(ETH_P_ARP): 4523 case htons(ETH_P_IP): 4524 case htons(ETH_P_IPV6): 4525 break; 4526 default: 4527 return false; 4528 } 4529 4530 return true; 4531 } 4532 4533 static void 4534 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4535 struct sk_buff_head *queue) 4536 { 4537 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4538 struct ieee80211_local *local = sdata->local; 4539 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4540 struct sta_info *sta, *first = NULL; 4541 struct sk_buff *cloned_skb; 4542 4543 rcu_read_lock(); 4544 4545 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4546 if (sdata != sta->sdata) 4547 /* AP-VLAN mismatch */ 4548 continue; 4549 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4550 /* do not send back to source */ 4551 continue; 4552 if (!first) { 4553 first = sta; 4554 continue; 4555 } 4556 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4557 if (!cloned_skb) 4558 goto multicast; 4559 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4560 dev_kfree_skb(cloned_skb); 4561 goto multicast; 4562 } 4563 __skb_queue_tail(queue, cloned_skb); 4564 } 4565 4566 if (likely(first)) { 4567 if (unlikely(ieee80211_change_da(skb, first))) 4568 goto multicast; 4569 __skb_queue_tail(queue, skb); 4570 } else { 4571 /* no STA connected, drop */ 4572 kfree_skb(skb); 4573 skb = NULL; 4574 } 4575 4576 goto out; 4577 multicast: 4578 __skb_queue_purge(queue); 4579 __skb_queue_tail(queue, skb); 4580 out: 4581 rcu_read_unlock(); 4582 } 4583 4584 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4585 struct sk_buff *skb, u32 ctrl_flags, 4586 unsigned int link_id) 4587 { 4588 struct sk_buff *out; 4589 4590 out = skb_copy(skb, GFP_ATOMIC); 4591 if (!out) 4592 return; 4593 4594 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4595 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, 0); 4596 } 4597 4598 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4599 struct sk_buff *skb) 4600 { 4601 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4602 unsigned long links = sdata->vif.active_links; 4603 unsigned int link; 4604 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4605 4606 if (hweight16(links) == 1) { 4607 ctrl_flags |= u32_encode_bits(__ffs(links), 4608 IEEE80211_TX_CTRL_MLO_LINK); 4609 4610 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 0); 4611 return; 4612 } 4613 4614 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4615 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4616 ctrl_flags = 0; 4617 } 4618 kfree_skb(skb); 4619 } 4620 4621 /** 4622 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4623 * @skb: packet to be sent 4624 * @dev: incoming interface 4625 * 4626 * On failure skb will be freed. 4627 * 4628 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4629 */ 4630 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4631 struct net_device *dev) 4632 { 4633 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4634 const struct ethhdr *eth = (void *)skb->data; 4635 4636 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4637 goto normal; 4638 4639 if (unlikely(!ieee80211_sdata_running(sdata))) { 4640 kfree_skb(skb); 4641 return NETDEV_TX_OK; 4642 } 4643 4644 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4645 struct sk_buff_head queue; 4646 4647 __skb_queue_head_init(&queue); 4648 ieee80211_convert_to_unicast(skb, dev, &queue); 4649 while ((skb = __skb_dequeue(&queue))) 4650 __ieee80211_subif_start_xmit(skb, dev, 0, 4651 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4652 0); 4653 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4654 ((sdata->vif.type == NL80211_IFTYPE_AP && 4655 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4656 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4657 !sdata->wdev.use_4addr))) { 4658 ieee80211_mlo_multicast_tx(dev, skb); 4659 } else { 4660 normal: 4661 __ieee80211_subif_start_xmit(skb, dev, 0, 4662 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4663 0); 4664 } 4665 4666 return NETDEV_TX_OK; 4667 } 4668 4669 4670 4671 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4672 struct sk_buff *skb, struct sta_info *sta, 4673 bool txpending) 4674 { 4675 struct ieee80211_local *local = sdata->local; 4676 struct ieee80211_tx_control control = {}; 4677 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4678 struct ieee80211_sta *pubsta = NULL; 4679 unsigned long flags; 4680 int q = info->hw_queue; 4681 4682 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4683 4684 if (local->queue_stop_reasons[q] || 4685 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4686 if (txpending) 4687 skb_queue_head(&local->pending[q], skb); 4688 else 4689 skb_queue_tail(&local->pending[q], skb); 4690 4691 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4692 4693 return false; 4694 } 4695 4696 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4697 4698 if (sta && sta->uploaded) 4699 pubsta = &sta->sta; 4700 4701 control.sta = pubsta; 4702 4703 drv_tx(local, &control, skb); 4704 4705 return true; 4706 } 4707 4708 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4709 struct sk_buff *skb, struct sta_info *sta, 4710 bool txpending) 4711 { 4712 struct ieee80211_local *local = sdata->local; 4713 struct sk_buff *next; 4714 bool ret = true; 4715 4716 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4717 return true; 4718 4719 skb_list_walk_safe(skb, skb, next) { 4720 skb_mark_not_on_list(skb); 4721 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4722 ret = false; 4723 } 4724 4725 return ret; 4726 } 4727 4728 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4729 struct net_device *dev, struct sta_info *sta, 4730 struct ieee80211_key *key, struct sk_buff *skb) 4731 { 4732 struct ieee80211_tx_info *info; 4733 struct ieee80211_local *local = sdata->local; 4734 struct tid_ampdu_tx *tid_tx = NULL; 4735 struct sk_buff *seg, *next; 4736 unsigned int skbs = 0, len = 0; 4737 u16 queue; 4738 u8 tid; 4739 4740 queue = ieee80211_select_queue(sdata, sta, skb); 4741 skb_set_queue_mapping(skb, queue); 4742 4743 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4744 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4745 goto out_free; 4746 4747 skb = skb_share_check(skb, GFP_ATOMIC); 4748 if (unlikely(!skb)) 4749 return; 4750 4751 ieee80211_aggr_check(sdata, sta, skb); 4752 4753 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4754 4755 if (sta) 4756 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4757 if (tid_tx) { 4758 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4759 /* fall back to non-offload slow path */ 4760 __ieee80211_subif_start_xmit(skb, dev, 0, 4761 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4762 0); 4763 return; 4764 } 4765 4766 if (tid_tx->timeout) 4767 tid_tx->last_tx = jiffies; 4768 } 4769 4770 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4771 if (!skb) 4772 return; 4773 4774 info = IEEE80211_SKB_CB(skb); 4775 memset(info, 0, sizeof(*info)); 4776 4777 info->hw_queue = sdata->vif.hw_queue[queue]; 4778 4779 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4780 sdata = container_of(sdata->bss, 4781 struct ieee80211_sub_if_data, u.ap); 4782 4783 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4784 info->control.vif = &sdata->vif; 4785 4786 if (key) 4787 info->control.hw_key = &key->conf; 4788 4789 skb_list_walk_safe(skb, seg, next) { 4790 skbs++; 4791 len += seg->len; 4792 if (seg != skb) 4793 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4794 } 4795 4796 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4797 info->status_data = ieee80211_store_ack_skb(local, skb, 4798 &info->flags, 0); 4799 if (info->status_data) 4800 info->status_data_idr = 1; 4801 } 4802 4803 dev_sw_netstats_tx_add(dev, skbs, len); 4804 4805 if (sta) { 4806 sta->deflink.tx_stats.packets[queue] += skbs; 4807 sta->deflink.tx_stats.bytes[queue] += len; 4808 } 4809 4810 ieee80211_tpt_led_trig_tx(local, len); 4811 4812 ieee80211_tx_8023(sdata, skb, sta, false); 4813 4814 return; 4815 4816 out_free: 4817 kfree_skb(skb); 4818 } 4819 4820 static bool ieee80211_check_mcast_offload(struct ieee80211_sub_if_data *sdata, 4821 struct sk_buff *skb) 4822 { 4823 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4824 4825 if ((ieee80211_vif_is_mld(&sdata->vif) && 4826 (sdata->vif.type == NL80211_IFTYPE_AP && 4827 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX))) || 4828 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4829 !sdata->wdev.use_4addr)) 4830 return false; 4831 4832 if (!is_multicast_ether_addr(skb->data) || 4833 !(sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_MCAST) || 4834 sdata->control_port_protocol == ehdr->h_proto) 4835 return false; 4836 4837 return true; 4838 } 4839 4840 static void __ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4841 struct net_device *dev) 4842 { 4843 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4844 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4845 struct ieee80211_link_data *link; 4846 struct ieee80211_key *key; 4847 struct sta_info *sta; 4848 4849 rcu_read_lock(); 4850 4851 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4852 kfree_skb(skb); 4853 goto out; 4854 } 4855 4856 /* 4857 * If STA is invalid, use the multicast offload path when applicable. 4858 * In AP mode, drop the frame if there are no associated stations; 4859 * otherwise use the default link and multicast key for transmission. 4860 */ 4861 if (unlikely(IS_ERR_OR_NULL(sta) && 4862 ieee80211_check_mcast_offload(sdata, skb))) { 4863 sta = NULL; 4864 if (ieee80211_vif_get_num_mcast_if(sdata) <= 0) { 4865 /* No associated STAs - no need to send multicast frames. */ 4866 kfree_skb(skb); 4867 goto out; 4868 } 4869 link = &sdata->deflink; 4870 key = rcu_dereference(link->default_multicast_key); 4871 } else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4872 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4873 sdata->control_port_protocol == ehdr->h_proto)) { 4874 goto skip_offload; 4875 } else { 4876 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4877 if (!key) 4878 key = rcu_dereference(sdata->default_unicast_key); 4879 } 4880 4881 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4882 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4883 goto skip_offload; 4884 4885 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4886 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4887 goto out; 4888 4889 skip_offload: 4890 ieee80211_subif_start_xmit(skb, dev); 4891 out: 4892 rcu_read_unlock(); 4893 } 4894 4895 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4896 struct net_device *dev) 4897 { 4898 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4899 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4900 4901 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4902 kfree_skb(skb); 4903 return NETDEV_TX_OK; 4904 } 4905 4906 if (unlikely(is_multicast_ether_addr(ehdr->h_dest) && 4907 ieee80211_multicast_to_unicast(skb, dev))) { 4908 struct sk_buff_head queue; 4909 4910 __skb_queue_head_init(&queue); 4911 ieee80211_convert_to_unicast(skb, dev, &queue); 4912 while ((skb = __skb_dequeue(&queue))) 4913 __ieee80211_subif_start_xmit_8023(skb, dev); 4914 } else { 4915 __ieee80211_subif_start_xmit_8023(skb, dev); 4916 } 4917 4918 return NETDEV_TX_OK; 4919 } 4920 4921 struct sk_buff * 4922 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4923 struct sk_buff *skb, u32 info_flags) 4924 { 4925 struct ieee80211_hdr *hdr; 4926 struct ieee80211_tx_data tx = { 4927 .local = sdata->local, 4928 .sdata = sdata, 4929 }; 4930 struct sta_info *sta; 4931 4932 rcu_read_lock(); 4933 4934 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4935 kfree_skb(skb); 4936 skb = ERR_PTR(-EINVAL); 4937 goto out; 4938 } 4939 4940 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4941 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 0); 4942 if (IS_ERR(skb)) 4943 goto out; 4944 4945 hdr = (void *)skb->data; 4946 tx.sta = sta_info_get(sdata, hdr->addr1); 4947 tx.skb = skb; 4948 4949 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4950 rcu_read_unlock(); 4951 kfree_skb(skb); 4952 return ERR_PTR(-EINVAL); 4953 } 4954 4955 out: 4956 rcu_read_unlock(); 4957 return skb; 4958 } 4959 4960 /* 4961 * ieee80211_clear_tx_pending may not be called in a context where 4962 * it is possible that it packets could come in again. 4963 */ 4964 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4965 { 4966 struct sk_buff *skb; 4967 int i; 4968 4969 for (i = 0; i < local->hw.queues; i++) { 4970 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4971 ieee80211_free_txskb(&local->hw, skb); 4972 } 4973 } 4974 4975 /* 4976 * Returns false if the frame couldn't be transmitted but was queued instead, 4977 * which in this case means re-queued -- take as an indication to stop sending 4978 * more pending frames. 4979 */ 4980 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4981 struct sk_buff *skb) 4982 { 4983 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4984 struct ieee80211_sub_if_data *sdata; 4985 struct sta_info *sta; 4986 struct ieee80211_hdr *hdr; 4987 bool result; 4988 struct ieee80211_chanctx_conf *chanctx_conf; 4989 4990 sdata = vif_to_sdata(info->control.vif); 4991 4992 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4993 /* update band only for non-MLD */ 4994 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4995 chanctx_conf = 4996 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4997 if (unlikely(!chanctx_conf)) { 4998 dev_kfree_skb(skb); 4999 return true; 5000 } 5001 info->band = chanctx_conf->def.chan->band; 5002 } 5003 result = ieee80211_tx(sdata, NULL, skb, true); 5004 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 5005 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 5006 dev_kfree_skb(skb); 5007 return true; 5008 } 5009 5010 if (IS_ERR(sta) || (sta && !sta->uploaded)) 5011 sta = NULL; 5012 5013 result = ieee80211_tx_8023(sdata, skb, sta, true); 5014 } else { 5015 struct sk_buff_head skbs; 5016 5017 __skb_queue_head_init(&skbs); 5018 __skb_queue_tail(&skbs, skb); 5019 5020 hdr = (struct ieee80211_hdr *)skb->data; 5021 sta = sta_info_get(sdata, hdr->addr1); 5022 5023 result = __ieee80211_tx(local, &skbs, sta, true); 5024 } 5025 5026 return result; 5027 } 5028 5029 /* 5030 * Transmit all pending packets. Called from tasklet. 5031 */ 5032 void ieee80211_tx_pending(struct tasklet_struct *t) 5033 { 5034 struct ieee80211_local *local = from_tasklet(local, t, 5035 tx_pending_tasklet); 5036 unsigned long flags; 5037 int i; 5038 bool txok; 5039 5040 rcu_read_lock(); 5041 5042 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 5043 for (i = 0; i < local->hw.queues; i++) { 5044 /* 5045 * If queue is stopped by something other than due to pending 5046 * frames, or we have no pending frames, proceed to next queue. 5047 */ 5048 if (local->queue_stop_reasons[i] || 5049 skb_queue_empty(&local->pending[i])) 5050 continue; 5051 5052 while (!skb_queue_empty(&local->pending[i])) { 5053 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 5054 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5055 5056 if (WARN_ON(!info->control.vif)) { 5057 ieee80211_free_txskb(&local->hw, skb); 5058 continue; 5059 } 5060 5061 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 5062 flags); 5063 5064 txok = ieee80211_tx_pending_skb(local, skb); 5065 spin_lock_irqsave(&local->queue_stop_reason_lock, 5066 flags); 5067 if (!txok) 5068 break; 5069 } 5070 } 5071 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 5072 5073 rcu_read_unlock(); 5074 } 5075 5076 /* functions for drivers to get certain frames */ 5077 5078 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 5079 struct sk_buff *skb, 5080 bool mcast_traffic) 5081 { 5082 int i, n1 = 0, n2; 5083 5084 /* 5085 * Find largest even number N1 so that bits numbered 1 through 5086 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 5087 * (N2 + 1) x 8 through 2007 are 0. 5088 */ 5089 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 5090 if (ps->tim[i]) { 5091 n1 = i & 0xfe; 5092 break; 5093 } 5094 } 5095 n2 = n1; 5096 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 5097 if (ps->tim[i]) { 5098 n2 = i; 5099 break; 5100 } 5101 } 5102 5103 /* Bitmap control */ 5104 skb_put_u8(skb, n1 | mcast_traffic); 5105 /* Part Virt Bitmap */ 5106 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 5107 } 5108 5109 /* 5110 * mac80211 currently supports encoding using block bitmap mode, non 5111 * inversed. The current implementation supports up to 1600 AIDs. 5112 * 5113 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 5114 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 5115 * describes 8 AIDs and the presence of a subblock is determined by 5116 * the block bitmap. 5117 */ 5118 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 5119 struct sk_buff *skb, 5120 bool mcast_traffic, 5121 bool ucast_traffic) 5122 { 5123 int blk; 5124 5125 /* 5126 * if no unicast and multicast traffic don't emit a bitmap control 5127 * or pvb 5128 */ 5129 if (!mcast_traffic && !ucast_traffic) 5130 return; 5131 5132 /* 5133 * Emit a bitmap control block with a page slice number of 31 and a 5134 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 5135 * that the entire page (2048 bits) indicated by the page index 5136 * is encoded in the partial virtual bitmap. 5137 */ 5138 skb_put_u8(skb, mcast_traffic | (31 << 1)); 5139 5140 /* If there's no unicast traffic we don't need to include a PVB. */ 5141 if (!ucast_traffic) 5142 return; 5143 5144 /* Emit an encoded block for each non-zero sub-block */ 5145 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 5146 u8 blk_bmap = 0; 5147 int sblk; 5148 5149 for (sblk = 0; sblk < 8; sblk++) { 5150 int sblk_idx = blk * 8 + sblk; 5151 5152 /* 5153 * If the current subblock is non-zero, increase the 5154 * number of subblocks to emit for the current block. 5155 */ 5156 if (ps->tim[sblk_idx]) 5157 blk_bmap |= BIT(sblk); 5158 } 5159 5160 /* If the current block contains no non-zero sublocks */ 5161 if (!blk_bmap) 5162 continue; 5163 5164 /* 5165 * Emit a block control byte for the current encoded block 5166 * with an encoding mode of block bitmap (0x0), not inverse 5167 * (0x0) and the current block offset (5 bits) 5168 */ 5169 skb_put_u8(skb, blk << 3); 5170 5171 /* 5172 * Emit the block bitmap for the current encoded block which 5173 * contains the present subblocks. 5174 */ 5175 skb_put_u8(skb, blk_bmap); 5176 5177 /* Emit the present subblocks */ 5178 for (sblk = 0; sblk < 8; sblk++) { 5179 int sblk_idx = blk * 8 + sblk; 5180 5181 if (!(blk_bmap & BIT(sblk))) 5182 continue; 5183 5184 skb_put_u8(skb, ps->tim[sblk_idx]); 5185 } 5186 } 5187 } 5188 5189 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5190 struct ieee80211_link_data *link, 5191 struct ps_data *ps, struct sk_buff *skb, 5192 bool is_template) 5193 { 5194 struct element *tim; 5195 bool mcast_traffic = false, have_bits = false; 5196 struct ieee80211_bss_conf *link_conf = link->conf; 5197 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5198 5199 /* Generate bitmap for TIM only if there are any STAs in power save 5200 * mode. */ 5201 if (atomic_read(&ps->num_sta_ps) > 0) 5202 /* in the hope that this is faster than 5203 * checking byte-for-byte */ 5204 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5205 IEEE80211_MAX_AID + 1); 5206 5207 if (!is_template) { 5208 if (ps->dtim_count == 0) 5209 ps->dtim_count = link_conf->dtim_period - 1; 5210 else 5211 ps->dtim_count--; 5212 } 5213 5214 /* Length is set after parsing the AID bitmap */ 5215 tim = skb_put(skb, sizeof(struct element)); 5216 tim->id = WLAN_EID_TIM; 5217 skb_put_u8(skb, ps->dtim_count); 5218 skb_put_u8(skb, link_conf->dtim_period); 5219 5220 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5221 mcast_traffic = true; 5222 5223 ps->dtim_bc_mc = mcast_traffic; 5224 5225 if (s1g) { 5226 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, mcast_traffic, 5227 have_bits); 5228 } else if (have_bits) { 5229 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5230 } else { 5231 /* Bitmap control */ 5232 skb_put_u8(skb, mcast_traffic); 5233 /* Part Virt Bitmap */ 5234 skb_put_u8(skb, 0); 5235 } 5236 5237 tim->datalen = skb_tail_pointer(skb) - tim->data; 5238 } 5239 5240 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5241 struct ieee80211_link_data *link, 5242 struct ps_data *ps, struct sk_buff *skb, 5243 bool is_template) 5244 { 5245 struct ieee80211_local *local = sdata->local; 5246 5247 /* 5248 * Not very nice, but we want to allow the driver to call 5249 * ieee80211_beacon_get() as a response to the set_tim() 5250 * callback. That, however, is already invoked under the 5251 * sta_lock to guarantee consistent and race-free update 5252 * of the tim bitmap in mac80211 and the driver. 5253 */ 5254 if (local->tim_in_locked_section) { 5255 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5256 } else { 5257 spin_lock_bh(&local->tim_lock); 5258 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5259 spin_unlock_bh(&local->tim_lock); 5260 } 5261 5262 return 0; 5263 } 5264 5265 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5266 struct beacon_data *beacon, 5267 struct ieee80211_link_data *link) 5268 { 5269 u8 *beacon_data, count, max_count = 1; 5270 struct probe_resp *resp; 5271 size_t beacon_data_len; 5272 u16 *bcn_offsets; 5273 int i; 5274 5275 switch (sdata->vif.type) { 5276 case NL80211_IFTYPE_AP: 5277 beacon_data = beacon->tail; 5278 beacon_data_len = beacon->tail_len; 5279 break; 5280 case NL80211_IFTYPE_ADHOC: 5281 beacon_data = beacon->head; 5282 beacon_data_len = beacon->head_len; 5283 break; 5284 case NL80211_IFTYPE_MESH_POINT: 5285 beacon_data = beacon->head; 5286 beacon_data_len = beacon->head_len; 5287 break; 5288 default: 5289 return; 5290 } 5291 5292 resp = rcu_dereference(link->u.ap.probe_resp); 5293 5294 bcn_offsets = beacon->cntdwn_counter_offsets; 5295 count = beacon->cntdwn_current_counter; 5296 if (link->conf->csa_active) 5297 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5298 5299 for (i = 0; i < max_count; ++i) { 5300 if (bcn_offsets[i]) { 5301 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5302 return; 5303 beacon_data[bcn_offsets[i]] = count; 5304 } 5305 5306 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5307 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5308 5309 if (resp_offsets[i]) 5310 resp->data[resp_offsets[i]] = count; 5311 } 5312 } 5313 } 5314 5315 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5316 struct beacon_data *beacon) 5317 { 5318 if (beacon->cntdwn_current_counter == 1) { 5319 /* 5320 * Channel switch handling is done by a worker thread while 5321 * beacons get pulled from hardware timers. It's therefore 5322 * possible that software threads are slow enough to not be 5323 * able to complete CSA handling in a single beacon interval, 5324 * in which case we get here. There isn't much to do about 5325 * it, other than letting the user know that the AP isn't 5326 * behaving correctly. 5327 */ 5328 link_err_once(link, 5329 "beacon TX faster than countdown (channel/color switch) completion\n"); 5330 return 0; 5331 } 5332 5333 beacon->cntdwn_current_counter--; 5334 5335 return beacon->cntdwn_current_counter; 5336 } 5337 5338 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5339 { 5340 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5341 struct ieee80211_link_data *link; 5342 struct beacon_data *beacon = NULL; 5343 u8 count = 0; 5344 5345 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5346 return 0; 5347 5348 rcu_read_lock(); 5349 5350 link = rcu_dereference(sdata->link[link_id]); 5351 if (!link) 5352 goto unlock; 5353 5354 if (sdata->vif.type == NL80211_IFTYPE_AP) 5355 beacon = rcu_dereference(link->u.ap.beacon); 5356 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5357 beacon = rcu_dereference(sdata->u.ibss.presp); 5358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5359 beacon = rcu_dereference(sdata->u.mesh.beacon); 5360 5361 if (!beacon) 5362 goto unlock; 5363 5364 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5365 5366 unlock: 5367 rcu_read_unlock(); 5368 return count; 5369 } 5370 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5371 5372 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5373 { 5374 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5375 struct beacon_data *beacon = NULL; 5376 5377 rcu_read_lock(); 5378 5379 if (sdata->vif.type == NL80211_IFTYPE_AP) 5380 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5381 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5382 beacon = rcu_dereference(sdata->u.ibss.presp); 5383 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5384 beacon = rcu_dereference(sdata->u.mesh.beacon); 5385 5386 if (!beacon) 5387 goto unlock; 5388 5389 if (counter < beacon->cntdwn_current_counter) 5390 beacon->cntdwn_current_counter = counter; 5391 5392 unlock: 5393 rcu_read_unlock(); 5394 } 5395 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5396 5397 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5398 unsigned int link_id) 5399 { 5400 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5401 struct ieee80211_link_data *link; 5402 struct beacon_data *beacon = NULL; 5403 u8 *beacon_data; 5404 size_t beacon_data_len; 5405 int ret = false; 5406 5407 if (!ieee80211_sdata_running(sdata)) 5408 return false; 5409 5410 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5411 return 0; 5412 5413 rcu_read_lock(); 5414 5415 link = rcu_dereference(sdata->link[link_id]); 5416 if (!link) 5417 goto out; 5418 5419 if (vif->type == NL80211_IFTYPE_AP) { 5420 beacon = rcu_dereference(link->u.ap.beacon); 5421 if (WARN_ON(!beacon || !beacon->tail)) 5422 goto out; 5423 beacon_data = beacon->tail; 5424 beacon_data_len = beacon->tail_len; 5425 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5426 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5427 5428 beacon = rcu_dereference(ifibss->presp); 5429 if (!beacon) 5430 goto out; 5431 5432 beacon_data = beacon->head; 5433 beacon_data_len = beacon->head_len; 5434 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5435 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5436 5437 beacon = rcu_dereference(ifmsh->beacon); 5438 if (!beacon) 5439 goto out; 5440 5441 beacon_data = beacon->head; 5442 beacon_data_len = beacon->head_len; 5443 } else { 5444 WARN_ON(1); 5445 goto out; 5446 } 5447 5448 if (!beacon->cntdwn_counter_offsets[0]) 5449 goto out; 5450 5451 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5452 goto out; 5453 5454 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5455 ret = true; 5456 5457 out: 5458 rcu_read_unlock(); 5459 5460 return ret; 5461 } 5462 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5463 5464 static int ieee80211_beacon_protect(struct sk_buff *skb, 5465 struct ieee80211_local *local, 5466 struct ieee80211_sub_if_data *sdata, 5467 struct ieee80211_link_data *link) 5468 { 5469 ieee80211_tx_result res; 5470 struct ieee80211_tx_data tx; 5471 struct sk_buff *check_skb; 5472 5473 memset(&tx, 0, sizeof(tx)); 5474 tx.key = rcu_dereference(link->default_beacon_key); 5475 if (!tx.key) 5476 return 0; 5477 5478 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5479 tx.key = NULL; 5480 return -EINVAL; 5481 } 5482 5483 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5484 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5485 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5486 5487 tx.local = local; 5488 tx.sdata = sdata; 5489 __skb_queue_head_init(&tx.skbs); 5490 __skb_queue_tail(&tx.skbs, skb); 5491 res = ieee80211_tx_h_encrypt(&tx); 5492 check_skb = __skb_dequeue(&tx.skbs); 5493 /* we may crash after this, but it'd be a bug in crypto */ 5494 WARN_ON(check_skb != skb); 5495 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5496 return -EINVAL; 5497 5498 return 0; 5499 } 5500 5501 int ieee80211_encrypt_tx_skb(struct sk_buff *skb) 5502 { 5503 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5504 struct ieee80211_sub_if_data *sdata = NULL; 5505 struct sk_buff *check_skb; 5506 struct ieee80211_tx_data tx; 5507 ieee80211_tx_result res; 5508 5509 if (!info->control.hw_key) 5510 return 0; 5511 5512 memset(&tx, 0, sizeof(tx)); 5513 tx.key = container_of(info->control.hw_key, struct ieee80211_key, conf); 5514 /* NULL it out now so we do full SW crypto */ 5515 info->control.hw_key = NULL; 5516 __skb_queue_head_init(&tx.skbs); 5517 __skb_queue_tail(&tx.skbs, skb); 5518 5519 if (skb->dev) 5520 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5521 else if (info->control.vif) 5522 sdata = vif_to_sdata(info->control.vif); 5523 5524 if (WARN_ON(!sdata)) 5525 return -EINVAL; 5526 5527 tx.sdata = sdata; 5528 tx.local = sdata->local; 5529 res = ieee80211_tx_h_encrypt(&tx); 5530 check_skb = __skb_dequeue(&tx.skbs); 5531 /* we may crash after this, but it'd be a bug in crypto */ 5532 WARN_ON(check_skb != skb); 5533 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5534 return -EINVAL; 5535 5536 return 0; 5537 } 5538 EXPORT_SYMBOL_GPL(ieee80211_encrypt_tx_skb); 5539 5540 static void 5541 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5542 struct ieee80211_vif *vif, 5543 struct ieee80211_link_data *link, 5544 struct ieee80211_mutable_offsets *offs, 5545 struct beacon_data *beacon, 5546 struct sk_buff *skb, 5547 struct ieee80211_chanctx_conf *chanctx_conf, 5548 u16 csa_off_base) 5549 { 5550 struct ieee80211_local *local = hw_to_local(hw); 5551 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5552 struct ieee80211_tx_info *info; 5553 enum nl80211_band band; 5554 struct ieee80211_tx_rate_control txrc; 5555 5556 /* CSA offsets */ 5557 if (offs && beacon) { 5558 u16 i; 5559 5560 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5561 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5562 5563 if (!csa_off) 5564 continue; 5565 5566 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5567 } 5568 } 5569 5570 band = chanctx_conf->def.chan->band; 5571 info = IEEE80211_SKB_CB(skb); 5572 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5573 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5574 info->band = band; 5575 5576 memset(&txrc, 0, sizeof(txrc)); 5577 txrc.hw = hw; 5578 txrc.sband = local->hw.wiphy->bands[band]; 5579 txrc.bss_conf = link->conf; 5580 txrc.skb = skb; 5581 txrc.reported_rate.idx = -1; 5582 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5583 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5584 else 5585 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5586 txrc.bss = true; 5587 rate_control_get_rate(sdata, NULL, &txrc); 5588 5589 info->control.vif = vif; 5590 info->control.flags |= u32_encode_bits(link->link_id, 5591 IEEE80211_TX_CTRL_MLO_LINK); 5592 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5593 IEEE80211_TX_CTL_ASSIGN_SEQ | 5594 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5595 } 5596 5597 static void 5598 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5599 u8 i) 5600 { 5601 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5602 i > beacon->mbssid_ies->cnt) 5603 return; 5604 5605 if (i < beacon->mbssid_ies->cnt) { 5606 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5607 beacon->mbssid_ies->elem[i].len); 5608 5609 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5610 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5611 beacon->rnr_ies->elem[i].len); 5612 5613 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5614 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5615 beacon->rnr_ies->elem[i].len); 5616 } 5617 return; 5618 } 5619 5620 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5621 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5622 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5623 beacon->mbssid_ies->elem[i].len); 5624 } 5625 5626 static struct sk_buff * 5627 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5628 struct ieee80211_vif *vif, 5629 struct ieee80211_link_data *link, 5630 struct ieee80211_mutable_offsets *offs, 5631 bool is_template, 5632 struct beacon_data *beacon, 5633 struct ieee80211_chanctx_conf *chanctx_conf, 5634 u8 ema_index) 5635 { 5636 struct ieee80211_local *local = hw_to_local(hw); 5637 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5638 struct ieee80211_if_ap *ap = &sdata->u.ap; 5639 struct sk_buff *skb = NULL; 5640 u16 csa_off_base = 0; 5641 int mbssid_len; 5642 5643 if (beacon->cntdwn_counter_offsets[0]) { 5644 if (!is_template) 5645 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5646 5647 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5648 } 5649 5650 /* headroom, head length, 5651 * tail length, maximum TIM length and multiple BSSID length 5652 */ 5653 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5654 beacon->rnr_ies, 5655 ema_index); 5656 5657 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5658 beacon->tail_len + 256 + 5659 local->hw.extra_beacon_tailroom + mbssid_len); 5660 if (!skb) 5661 return NULL; 5662 5663 skb_reserve(skb, local->tx_headroom); 5664 skb_put_data(skb, beacon->head, beacon->head_len); 5665 5666 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5667 5668 if (offs) { 5669 offs->tim_offset = beacon->head_len; 5670 offs->tim_length = skb->len - beacon->head_len; 5671 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5672 5673 if (mbssid_len) { 5674 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5675 offs->mbssid_off = skb->len - mbssid_len; 5676 } 5677 5678 /* for AP the csa offsets are from tail */ 5679 csa_off_base = skb->len; 5680 } 5681 5682 if (beacon->tail) 5683 skb_put_data(skb, beacon->tail, beacon->tail_len); 5684 5685 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5686 dev_kfree_skb(skb); 5687 return NULL; 5688 } 5689 5690 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5691 chanctx_conf, csa_off_base); 5692 return skb; 5693 } 5694 5695 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5696 struct ieee80211_link_data *link) 5697 { 5698 struct ps_data *ps = &sdata->u.ap.ps; 5699 5700 if (ps->sb_count == 0) 5701 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5702 else 5703 ps->sb_count--; 5704 5705 return ps->sb_count == 0; 5706 } 5707 5708 static struct sk_buff * 5709 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5710 struct ieee80211_vif *vif, 5711 struct ieee80211_link_data *link, 5712 struct ieee80211_chanctx_conf *chanctx_conf, 5713 struct s1g_short_beacon_data *sb, 5714 bool is_template) 5715 { 5716 struct ieee80211_local *local = hw_to_local(hw); 5717 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5718 struct ieee80211_if_ap *ap = &sdata->u.ap; 5719 struct sk_buff *skb; 5720 5721 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5722 sb->short_tail_len + 256 + 5723 local->hw.extra_beacon_tailroom); 5724 if (!skb) 5725 return NULL; 5726 5727 skb_reserve(skb, local->tx_headroom); 5728 skb_put_data(skb, sb->short_head, sb->short_head_len); 5729 5730 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5731 5732 if (sb->short_tail) 5733 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5734 5735 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5736 chanctx_conf, 0); 5737 return skb; 5738 } 5739 5740 static struct sk_buff * 5741 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5742 struct ieee80211_link_data *link, 5743 struct ieee80211_mutable_offsets *offs, 5744 bool is_template, struct beacon_data *beacon, 5745 struct ieee80211_chanctx_conf *chanctx_conf, 5746 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5747 { 5748 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5749 5750 if (!sdata->vif.cfg.s1g || !s1g_sb || 5751 ieee80211_s1g_need_long_beacon(sdata, link)) 5752 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5753 is_template, beacon, 5754 chanctx_conf, ema_index); 5755 5756 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5757 s1g_sb, is_template); 5758 } 5759 5760 static struct ieee80211_ema_beacons * 5761 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5762 struct ieee80211_vif *vif, 5763 struct ieee80211_link_data *link, 5764 struct ieee80211_mutable_offsets *offs, 5765 bool is_template, struct beacon_data *beacon, 5766 struct ieee80211_chanctx_conf *chanctx_conf) 5767 { 5768 struct ieee80211_ema_beacons *ema = NULL; 5769 5770 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5771 return NULL; 5772 5773 ema = kzalloc_flex(*ema, bcn, beacon->mbssid_ies->cnt, GFP_ATOMIC); 5774 if (!ema) 5775 return NULL; 5776 5777 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5778 ema->bcn[ema->cnt].skb = 5779 ieee80211_beacon_get_ap(hw, vif, link, 5780 &ema->bcn[ema->cnt].offs, 5781 is_template, beacon, 5782 chanctx_conf, ema->cnt, NULL); 5783 if (!ema->bcn[ema->cnt].skb) 5784 break; 5785 } 5786 5787 if (ema->cnt == beacon->mbssid_ies->cnt) 5788 return ema; 5789 5790 ieee80211_beacon_free_ema_list(ema); 5791 return NULL; 5792 } 5793 5794 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5795 5796 static struct sk_buff * 5797 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5798 struct ieee80211_vif *vif, 5799 struct ieee80211_mutable_offsets *offs, 5800 bool is_template, 5801 unsigned int link_id, 5802 int ema_index, 5803 struct ieee80211_ema_beacons **ema_beacons) 5804 { 5805 struct ieee80211_local *local = hw_to_local(hw); 5806 struct beacon_data *beacon = NULL; 5807 struct sk_buff *skb = NULL; 5808 struct ieee80211_sub_if_data *sdata = NULL; 5809 struct ieee80211_chanctx_conf *chanctx_conf; 5810 struct ieee80211_link_data *link; 5811 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5812 5813 rcu_read_lock(); 5814 5815 sdata = vif_to_sdata(vif); 5816 link = rcu_dereference(sdata->link[link_id]); 5817 if (!link) 5818 goto out; 5819 chanctx_conf = 5820 rcu_dereference(link->conf->chanctx_conf); 5821 5822 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5823 goto out; 5824 5825 if (offs) 5826 memset(offs, 0, sizeof(*offs)); 5827 5828 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5829 beacon = rcu_dereference(link->u.ap.beacon); 5830 if (!beacon) 5831 goto out; 5832 5833 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5834 s1g_short_bcn = 5835 rcu_dereference(link->u.ap.s1g_short_beacon); 5836 if (!s1g_short_bcn) 5837 goto out; 5838 } 5839 5840 if (ema_beacons) { 5841 *ema_beacons = 5842 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5843 offs, 5844 is_template, 5845 beacon, 5846 chanctx_conf); 5847 } else { 5848 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5849 if (ema_index >= beacon->mbssid_ies->cnt) 5850 goto out; /* End of MBSSID elements */ 5851 5852 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5853 ema_index = beacon->mbssid_ies->cnt; 5854 } else { 5855 ema_index = 0; 5856 } 5857 5858 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5859 is_template, beacon, 5860 chanctx_conf, ema_index, 5861 s1g_short_bcn); 5862 } 5863 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5864 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5865 struct ieee80211_hdr *hdr; 5866 5867 beacon = rcu_dereference(ifibss->presp); 5868 if (!beacon) 5869 goto out; 5870 5871 if (beacon->cntdwn_counter_offsets[0]) { 5872 if (!is_template) 5873 __ieee80211_beacon_update_cntdwn(link, beacon); 5874 5875 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5876 } 5877 5878 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5879 local->hw.extra_beacon_tailroom); 5880 if (!skb) 5881 goto out; 5882 skb_reserve(skb, local->tx_headroom); 5883 skb_put_data(skb, beacon->head, beacon->head_len); 5884 5885 hdr = (struct ieee80211_hdr *) skb->data; 5886 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5887 IEEE80211_STYPE_BEACON); 5888 5889 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5890 chanctx_conf, 0); 5891 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5892 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5893 5894 beacon = rcu_dereference(ifmsh->beacon); 5895 if (!beacon) 5896 goto out; 5897 5898 if (beacon->cntdwn_counter_offsets[0]) { 5899 if (!is_template) 5900 /* TODO: For mesh csa_counter is in TU, so 5901 * decrementing it by one isn't correct, but 5902 * for now we leave it consistent with overall 5903 * mac80211's behavior. 5904 */ 5905 __ieee80211_beacon_update_cntdwn(link, beacon); 5906 5907 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5908 } 5909 5910 if (ifmsh->sync_ops) 5911 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5912 5913 skb = dev_alloc_skb(local->tx_headroom + 5914 beacon->head_len + 5915 256 + /* TIM IE */ 5916 beacon->tail_len + 5917 local->hw.extra_beacon_tailroom); 5918 if (!skb) 5919 goto out; 5920 skb_reserve(skb, local->tx_headroom); 5921 skb_put_data(skb, beacon->head, beacon->head_len); 5922 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5923 is_template); 5924 5925 if (offs) { 5926 offs->tim_offset = beacon->head_len; 5927 offs->tim_length = skb->len - beacon->head_len; 5928 } 5929 5930 skb_put_data(skb, beacon->tail, beacon->tail_len); 5931 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5932 chanctx_conf, 0); 5933 } else { 5934 WARN_ON(1); 5935 goto out; 5936 } 5937 5938 out: 5939 rcu_read_unlock(); 5940 return skb; 5941 5942 } 5943 5944 struct sk_buff * 5945 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5946 struct ieee80211_vif *vif, 5947 struct ieee80211_mutable_offsets *offs, 5948 unsigned int link_id) 5949 { 5950 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5951 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5952 } 5953 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5954 5955 struct sk_buff * 5956 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5957 struct ieee80211_vif *vif, 5958 struct ieee80211_mutable_offsets *offs, 5959 unsigned int link_id, u8 ema_index) 5960 { 5961 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5962 NULL); 5963 } 5964 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5965 5966 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5967 { 5968 u8 i; 5969 5970 if (!ema_beacons) 5971 return; 5972 5973 for (i = 0; i < ema_beacons->cnt; i++) 5974 kfree_skb(ema_beacons->bcn[i].skb); 5975 5976 kfree(ema_beacons); 5977 } 5978 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5979 5980 struct ieee80211_ema_beacons * 5981 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5982 struct ieee80211_vif *vif, 5983 unsigned int link_id) 5984 { 5985 struct ieee80211_ema_beacons *ema_beacons = NULL; 5986 5987 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5988 &ema_beacons)); 5989 5990 return ema_beacons; 5991 } 5992 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5993 5994 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5995 struct ieee80211_vif *vif, 5996 u16 *tim_offset, u16 *tim_length, 5997 unsigned int link_id) 5998 { 5999 struct ieee80211_mutable_offsets offs = {}; 6000 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 6001 link_id, 6002 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 6003 NULL); 6004 struct sk_buff *copy; 6005 6006 if (!bcn) 6007 return bcn; 6008 6009 if (tim_offset) 6010 *tim_offset = offs.tim_offset; 6011 6012 if (tim_length) 6013 *tim_length = offs.tim_length; 6014 6015 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 6016 !hw_to_local(hw)->monitors) 6017 return bcn; 6018 6019 /* send a copy to monitor interfaces */ 6020 copy = skb_copy(bcn, GFP_ATOMIC); 6021 if (!copy) 6022 return bcn; 6023 6024 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 6025 6026 return bcn; 6027 } 6028 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 6029 6030 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 6031 struct ieee80211_vif *vif) 6032 { 6033 struct sk_buff *skb = NULL; 6034 struct probe_resp *presp = NULL; 6035 struct ieee80211_hdr *hdr; 6036 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6037 6038 if (sdata->vif.type != NL80211_IFTYPE_AP) 6039 return NULL; 6040 6041 rcu_read_lock(); 6042 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 6043 if (!presp) 6044 goto out; 6045 6046 skb = dev_alloc_skb(presp->len); 6047 if (!skb) 6048 goto out; 6049 6050 skb_put_data(skb, presp->data, presp->len); 6051 6052 hdr = (struct ieee80211_hdr *) skb->data; 6053 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 6054 6055 out: 6056 rcu_read_unlock(); 6057 return skb; 6058 } 6059 EXPORT_SYMBOL(ieee80211_proberesp_get); 6060 6061 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 6062 struct ieee80211_vif *vif, 6063 unsigned int link_id) 6064 { 6065 struct sk_buff *skb = NULL; 6066 struct fils_discovery_data *tmpl = NULL; 6067 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6068 struct ieee80211_link_data *link; 6069 6070 if (sdata->vif.type != NL80211_IFTYPE_AP) 6071 return NULL; 6072 6073 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6074 return NULL; 6075 6076 guard(rcu)(); 6077 link = rcu_dereference(sdata->link[link_id]); 6078 if (!link) 6079 return NULL; 6080 6081 tmpl = rcu_dereference(link->u.ap.fils_discovery); 6082 if (!tmpl) 6083 return NULL; 6084 6085 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6086 if (skb) { 6087 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6088 skb_put_data(skb, tmpl->data, tmpl->len); 6089 } 6090 6091 return skb; 6092 } 6093 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 6094 6095 struct sk_buff * 6096 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 6097 struct ieee80211_vif *vif, 6098 unsigned int link_id) 6099 { 6100 struct sk_buff *skb = NULL; 6101 struct unsol_bcast_probe_resp_data *tmpl = NULL; 6102 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6103 struct ieee80211_link_data *link; 6104 6105 if (sdata->vif.type != NL80211_IFTYPE_AP) 6106 return NULL; 6107 6108 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6109 return NULL; 6110 6111 guard(rcu)(); 6112 link = rcu_dereference(sdata->link[link_id]); 6113 if (!link) 6114 return NULL; 6115 6116 tmpl = rcu_dereference(link->u.ap.unsol_bcast_probe_resp); 6117 if (!tmpl) 6118 return NULL; 6119 6120 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6121 if (skb) { 6122 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6123 skb_put_data(skb, tmpl->data, tmpl->len); 6124 } 6125 6126 return skb; 6127 } 6128 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 6129 6130 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 6131 struct ieee80211_vif *vif) 6132 { 6133 struct ieee80211_sub_if_data *sdata; 6134 struct ieee80211_pspoll *pspoll; 6135 struct ieee80211_local *local; 6136 struct sk_buff *skb; 6137 6138 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6139 return NULL; 6140 6141 sdata = vif_to_sdata(vif); 6142 local = sdata->local; 6143 6144 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 6145 if (!skb) 6146 return NULL; 6147 6148 skb_reserve(skb, local->hw.extra_tx_headroom); 6149 6150 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 6151 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 6152 IEEE80211_STYPE_PSPOLL); 6153 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 6154 6155 /* aid in PS-Poll has its two MSBs each set to 1 */ 6156 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 6157 6158 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 6159 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 6160 6161 return skb; 6162 } 6163 EXPORT_SYMBOL(ieee80211_pspoll_get); 6164 6165 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 6166 struct ieee80211_vif *vif, 6167 int link_id, bool qos_ok) 6168 { 6169 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6170 struct ieee80211_local *local = sdata->local; 6171 struct ieee80211_link_data *link = NULL; 6172 struct ieee80211_hdr_3addr *nullfunc; 6173 struct sk_buff *skb; 6174 bool qos = false; 6175 6176 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6177 return NULL; 6178 6179 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6180 sizeof(*nullfunc) + 2); 6181 if (!skb) 6182 return NULL; 6183 6184 rcu_read_lock(); 6185 if (qos_ok) { 6186 struct sta_info *sta; 6187 6188 sta = sta_info_get(sdata, vif->cfg.ap_addr); 6189 qos = sta && sta->sta.wme; 6190 } 6191 6192 if (link_id >= 0) { 6193 link = rcu_dereference(sdata->link[link_id]); 6194 if (WARN_ON_ONCE(!link)) { 6195 rcu_read_unlock(); 6196 kfree_skb(skb); 6197 return NULL; 6198 } 6199 } 6200 6201 skb_reserve(skb, local->hw.extra_tx_headroom); 6202 6203 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 6204 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 6205 IEEE80211_STYPE_NULLFUNC | 6206 IEEE80211_FCTL_TODS); 6207 if (qos) { 6208 __le16 qoshdr = cpu_to_le16(7); 6209 6210 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 6211 IEEE80211_STYPE_NULLFUNC) != 6212 IEEE80211_STYPE_QOS_NULLFUNC); 6213 nullfunc->frame_control |= 6214 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 6215 skb->priority = 7; 6216 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 6217 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 6218 } 6219 6220 if (link) { 6221 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 6222 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 6223 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 6224 } else { 6225 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 6226 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 6227 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 6228 } 6229 rcu_read_unlock(); 6230 6231 return skb; 6232 } 6233 EXPORT_SYMBOL(ieee80211_nullfunc_get); 6234 6235 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 6236 const u8 *src_addr, 6237 const u8 *ssid, size_t ssid_len, 6238 size_t tailroom) 6239 { 6240 struct ieee80211_local *local = hw_to_local(hw); 6241 struct ieee80211_hdr_3addr *hdr; 6242 struct sk_buff *skb; 6243 size_t ie_ssid_len; 6244 u8 *pos; 6245 6246 ie_ssid_len = 2 + ssid_len; 6247 6248 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6249 ie_ssid_len + tailroom); 6250 if (!skb) 6251 return NULL; 6252 6253 skb_reserve(skb, local->hw.extra_tx_headroom); 6254 6255 hdr = skb_put_zero(skb, sizeof(*hdr)); 6256 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6257 IEEE80211_STYPE_PROBE_REQ); 6258 eth_broadcast_addr(hdr->addr1); 6259 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6260 eth_broadcast_addr(hdr->addr3); 6261 6262 pos = skb_put(skb, ie_ssid_len); 6263 *pos++ = WLAN_EID_SSID; 6264 *pos++ = ssid_len; 6265 if (ssid_len) 6266 memcpy(pos, ssid, ssid_len); 6267 pos += ssid_len; 6268 6269 return skb; 6270 } 6271 EXPORT_SYMBOL(ieee80211_probereq_get); 6272 6273 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6274 const void *frame, size_t frame_len, 6275 const struct ieee80211_tx_info *frame_txctl, 6276 struct ieee80211_rts *rts) 6277 { 6278 const struct ieee80211_hdr *hdr = frame; 6279 6280 rts->frame_control = 6281 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6282 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6283 frame_txctl); 6284 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6285 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6286 } 6287 EXPORT_SYMBOL(ieee80211_rts_get); 6288 6289 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6290 const void *frame, size_t frame_len, 6291 const struct ieee80211_tx_info *frame_txctl, 6292 struct ieee80211_cts *cts) 6293 { 6294 const struct ieee80211_hdr *hdr = frame; 6295 6296 cts->frame_control = 6297 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6298 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6299 frame_len, frame_txctl); 6300 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6301 } 6302 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6303 6304 struct sk_buff * 6305 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6306 struct ieee80211_vif *vif) 6307 { 6308 struct ieee80211_local *local = hw_to_local(hw); 6309 struct sk_buff *skb = NULL; 6310 struct ieee80211_tx_data tx; 6311 struct ieee80211_sub_if_data *sdata; 6312 struct ps_data *ps; 6313 struct ieee80211_tx_info *info; 6314 struct ieee80211_chanctx_conf *chanctx_conf; 6315 6316 sdata = vif_to_sdata(vif); 6317 6318 rcu_read_lock(); 6319 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6320 6321 if (!chanctx_conf) 6322 goto out; 6323 6324 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6325 struct beacon_data *beacon = 6326 rcu_dereference(sdata->deflink.u.ap.beacon); 6327 6328 if (!beacon || !beacon->head) 6329 goto out; 6330 6331 ps = &sdata->u.ap.ps; 6332 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6333 ps = &sdata->u.mesh.ps; 6334 } else { 6335 goto out; 6336 } 6337 6338 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6339 goto out; /* send buffered bc/mc only after DTIM beacon */ 6340 6341 while (1) { 6342 skb = skb_dequeue(&ps->bc_buf); 6343 if (!skb) 6344 goto out; 6345 local->total_ps_buffered--; 6346 6347 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6348 struct ieee80211_hdr *hdr = 6349 (struct ieee80211_hdr *) skb->data; 6350 /* more buffered multicast/broadcast frames ==> set 6351 * MoreData flag in IEEE 802.11 header to inform PS 6352 * STAs */ 6353 hdr->frame_control |= 6354 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6355 } 6356 6357 if (sdata->vif.type == NL80211_IFTYPE_AP) 6358 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6359 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6360 break; 6361 ieee80211_free_txskb(hw, skb); 6362 } 6363 6364 info = IEEE80211_SKB_CB(skb); 6365 6366 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6367 info->band = chanctx_conf->def.chan->band; 6368 6369 if (invoke_tx_handlers(&tx)) 6370 skb = NULL; 6371 out: 6372 rcu_read_unlock(); 6373 6374 return skb; 6375 } 6376 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6377 6378 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6379 { 6380 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6381 struct ieee80211_sub_if_data *sdata = sta->sdata; 6382 struct ieee80211_local *local = sdata->local; 6383 int ret; 6384 u32 queues; 6385 6386 lockdep_assert_wiphy(local->hw.wiphy); 6387 6388 /* only some cases are supported right now */ 6389 switch (sdata->vif.type) { 6390 case NL80211_IFTYPE_STATION: 6391 case NL80211_IFTYPE_AP: 6392 case NL80211_IFTYPE_AP_VLAN: 6393 break; 6394 default: 6395 WARN_ON(1); 6396 return -EINVAL; 6397 } 6398 6399 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6400 return -EINVAL; 6401 6402 if (sta->reserved_tid == tid) { 6403 ret = 0; 6404 goto out; 6405 } 6406 6407 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6408 sdata_err(sdata, "TID reservation already active\n"); 6409 ret = -EALREADY; 6410 goto out; 6411 } 6412 6413 ieee80211_stop_vif_queues(sdata->local, sdata, 6414 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6415 6416 synchronize_net(); 6417 6418 /* Tear down BA sessions so we stop aggregating on this TID */ 6419 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6420 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6421 __ieee80211_stop_tx_ba_session(sta, tid, 6422 AGG_STOP_LOCAL_REQUEST); 6423 } 6424 6425 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6426 __ieee80211_flush_queues(local, sdata, queues, false); 6427 6428 sta->reserved_tid = tid; 6429 6430 ieee80211_wake_vif_queues(local, sdata, 6431 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6432 6433 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6434 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6435 6436 ret = 0; 6437 out: 6438 return ret; 6439 } 6440 EXPORT_SYMBOL(ieee80211_reserve_tid); 6441 6442 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6443 { 6444 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6445 struct ieee80211_sub_if_data *sdata = sta->sdata; 6446 6447 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6448 6449 /* only some cases are supported right now */ 6450 switch (sdata->vif.type) { 6451 case NL80211_IFTYPE_STATION: 6452 case NL80211_IFTYPE_AP: 6453 case NL80211_IFTYPE_AP_VLAN: 6454 break; 6455 default: 6456 WARN_ON(1); 6457 return; 6458 } 6459 6460 if (tid != sta->reserved_tid) { 6461 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6462 return; 6463 } 6464 6465 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6466 } 6467 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6468 6469 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6470 struct sk_buff *skb, int tid, int link_id, 6471 enum nl80211_band band) 6472 { 6473 const struct ieee80211_hdr *hdr = (void *)skb->data; 6474 int ac = ieee80211_ac_from_tid(tid); 6475 unsigned int link; 6476 6477 skb_reset_mac_header(skb); 6478 skb_set_queue_mapping(skb, ac); 6479 skb->priority = tid; 6480 6481 skb->dev = sdata->dev; 6482 6483 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6484 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6485 IEEE80211_LINK_UNSPECIFIED)); 6486 6487 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6488 link = 0; 6489 } else if (link_id >= 0) { 6490 link = link_id; 6491 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6492 /* address from the MLD */ 6493 link = IEEE80211_LINK_UNSPECIFIED; 6494 } else { 6495 /* otherwise must be addressed from a link */ 6496 rcu_read_lock(); 6497 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6498 struct ieee80211_bss_conf *link_conf; 6499 6500 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6501 if (!link_conf) 6502 continue; 6503 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6504 break; 6505 } 6506 rcu_read_unlock(); 6507 6508 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6509 link = ffs(sdata->vif.active_links) - 1; 6510 } 6511 6512 IEEE80211_SKB_CB(skb)->control.flags |= 6513 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6514 6515 /* 6516 * The other path calling ieee80211_xmit is from the tasklet, 6517 * and while we can handle concurrent transmissions locking 6518 * requirements are that we do not come into tx with bhs on. 6519 */ 6520 local_bh_disable(); 6521 IEEE80211_SKB_CB(skb)->band = band; 6522 ieee80211_xmit(sdata, NULL, skb); 6523 local_bh_enable(); 6524 } 6525 6526 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6527 struct sk_buff *skb, int tid, int link_id) 6528 { 6529 struct ieee80211_chanctx_conf *chanctx_conf; 6530 enum nl80211_band band; 6531 6532 rcu_read_lock(); 6533 if (sdata->vif.type == NL80211_IFTYPE_NAN || 6534 sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 6535 band = NUM_NL80211_BANDS; 6536 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6537 WARN_ON(link_id >= 0); 6538 chanctx_conf = 6539 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6540 if (WARN_ON(!chanctx_conf)) { 6541 rcu_read_unlock(); 6542 kfree_skb(skb); 6543 return; 6544 } 6545 band = chanctx_conf->def.chan->band; 6546 } else { 6547 WARN_ON(link_id >= 0 && 6548 !(sdata->vif.active_links & BIT(link_id))); 6549 /* MLD transmissions must not rely on the band */ 6550 band = 0; 6551 } 6552 6553 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6554 rcu_read_unlock(); 6555 } 6556 6557 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6558 const u8 *buf, size_t len, 6559 const u8 *dest, __be16 proto, bool unencrypted, 6560 int link_id, u64 cookie) 6561 { 6562 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6563 struct ieee80211_local *local = sdata->local; 6564 struct sta_info *sta; 6565 struct sk_buff *skb; 6566 struct ethhdr *ehdr; 6567 u32 ctrl_flags = 0; 6568 u32 flags = 0; 6569 int err; 6570 6571 /* mutex lock is only needed for incrementing the cookie counter */ 6572 lockdep_assert_wiphy(local->hw.wiphy); 6573 6574 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6575 * or Pre-Authentication 6576 */ 6577 if (proto != sdata->control_port_protocol && 6578 proto != cpu_to_be16(ETH_P_PREAUTH)) 6579 return -EINVAL; 6580 6581 if (proto == sdata->control_port_protocol) 6582 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6583 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6584 6585 if (unencrypted) 6586 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6587 6588 if (cookie) 6589 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6590 6591 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6592 6593 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6594 sizeof(struct ethhdr) + len); 6595 if (!skb) 6596 return -ENOMEM; 6597 6598 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6599 6600 skb_put_data(skb, buf, len); 6601 6602 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6603 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6604 6605 /* we may override the SA for MLO STA later */ 6606 if (link_id < 0) { 6607 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6608 IEEE80211_TX_CTRL_MLO_LINK); 6609 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6610 } else { 6611 struct ieee80211_bss_conf *link_conf; 6612 6613 ctrl_flags |= u32_encode_bits(link_id, 6614 IEEE80211_TX_CTRL_MLO_LINK); 6615 6616 rcu_read_lock(); 6617 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6618 if (!link_conf) { 6619 dev_kfree_skb(skb); 6620 rcu_read_unlock(); 6621 return -ENOLINK; 6622 } 6623 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6624 rcu_read_unlock(); 6625 } 6626 6627 ehdr->h_proto = proto; 6628 6629 skb->dev = dev; 6630 skb->protocol = proto; 6631 skb_reset_network_header(skb); 6632 skb_reset_mac_header(skb); 6633 6634 if (local->hw.queues < IEEE80211_NUM_ACS) 6635 goto start_xmit; 6636 6637 /* update QoS header to prioritize control port frames if possible, 6638 * prioritization also happens for control port frames send over 6639 * AF_PACKET 6640 */ 6641 rcu_read_lock(); 6642 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6643 if (err) { 6644 dev_kfree_skb(skb); 6645 rcu_read_unlock(); 6646 return err; 6647 } 6648 6649 if (!IS_ERR(sta)) { 6650 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6651 6652 skb_set_queue_mapping(skb, queue); 6653 6654 /* 6655 * for MLO STA, the SA should be the AP MLD address, but 6656 * the link ID has been selected already 6657 */ 6658 if (sta && sta->sta.mlo) 6659 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6660 } 6661 rcu_read_unlock(); 6662 6663 start_xmit: 6664 local_bh_disable(); 6665 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6666 local_bh_enable(); 6667 6668 return 0; 6669 } 6670 6671 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6672 const u8 *buf, size_t len) 6673 { 6674 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6675 struct ieee80211_local *local = sdata->local; 6676 struct sk_buff *skb; 6677 6678 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6679 30 + /* header size */ 6680 18); /* 11s header size */ 6681 if (!skb) 6682 return -ENOMEM; 6683 6684 skb_reserve(skb, local->hw.extra_tx_headroom); 6685 skb_put_data(skb, buf, len); 6686 6687 skb->dev = dev; 6688 skb->protocol = htons(ETH_P_802_3); 6689 skb_reset_network_header(skb); 6690 skb_reset_mac_header(skb); 6691 6692 local_bh_disable(); 6693 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6694 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6695 0); 6696 local_bh_enable(); 6697 6698 return 0; 6699 } 6700