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) 2018-2025 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 sband = local->hw.wiphy->bands[info->band]; 63 txrate = &sband->bitrates[tx->rate.idx]; 64 65 erp = txrate->flags & IEEE80211_RATE_ERP_G; 66 67 /* device is expected to do this */ 68 if (sband->band == NL80211_BAND_S1GHZ) 69 return 0; 70 71 /* 72 * data and mgmt (except PS Poll): 73 * - during CFP: 32768 74 * - during contention period: 75 * if addr1 is group address: 0 76 * if more fragments = 0 and addr1 is individual address: time to 77 * transmit one ACK plus SIFS 78 * if more fragments = 1 and addr1 is individual address: time to 79 * transmit next fragment plus 2 x ACK plus 3 x SIFS 80 * 81 * IEEE 802.11, 9.6: 82 * - control response frame (CTS or ACK) shall be transmitted using the 83 * same rate as the immediately previous frame in the frame exchange 84 * sequence, if this rate belongs to the PHY mandatory rates, or else 85 * at the highest possible rate belonging to the PHY rates in the 86 * BSSBasicRateSet 87 */ 88 hdr = (struct ieee80211_hdr *)skb->data; 89 if (ieee80211_is_ctl(hdr->frame_control)) { 90 /* TODO: These control frames are not currently sent by 91 * mac80211, but should they be implemented, this function 92 * needs to be updated to support duration field calculation. 93 * 94 * RTS: time needed to transmit pending data/mgmt frame plus 95 * one CTS frame plus one ACK frame plus 3 x SIFS 96 * CTS: duration of immediately previous RTS minus time 97 * required to transmit CTS and its SIFS 98 * ACK: 0 if immediately previous directed data/mgmt had 99 * more=0, with more=1 duration in ACK frame is duration 100 * from previous frame minus time needed to transmit ACK 101 * and its SIFS 102 * PS Poll: BIT(15) | BIT(14) | aid 103 */ 104 return 0; 105 } 106 107 /* data/mgmt */ 108 if (0 /* FIX: data/mgmt during CFP */) 109 return cpu_to_le16(32768); 110 111 if (group_addr) /* Group address as the destination - no ACK */ 112 return 0; 113 114 /* Individual destination address: 115 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 116 * CTS and ACK frames shall be transmitted using the highest rate in 117 * basic rate set that is less than or equal to the rate of the 118 * immediately previous frame and that is using the same modulation 119 * (CCK or OFDM). If no basic rate set matches with these requirements, 120 * the highest mandatory rate of the PHY that is less than or equal to 121 * the rate of the previous frame is used. 122 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 123 */ 124 rate = -1; 125 /* use lowest available if everything fails */ 126 mrate = sband->bitrates[0].bitrate; 127 for (i = 0; i < sband->n_bitrates; i++) { 128 struct ieee80211_rate *r = &sband->bitrates[i]; 129 u32 flag; 130 131 if (r->bitrate > txrate->bitrate) 132 break; 133 134 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 135 rate = r->bitrate; 136 137 switch (sband->band) { 138 case NL80211_BAND_2GHZ: 139 case NL80211_BAND_LC: 140 if (tx->sdata->deflink.operating_11g_mode) 141 flag = IEEE80211_RATE_MANDATORY_G; 142 else 143 flag = IEEE80211_RATE_MANDATORY_B; 144 break; 145 case NL80211_BAND_5GHZ: 146 case NL80211_BAND_6GHZ: 147 flag = IEEE80211_RATE_MANDATORY_A; 148 break; 149 default: 150 flag = 0; 151 WARN_ON(1); 152 break; 153 } 154 155 if (r->flags & flag) 156 mrate = r->bitrate; 157 } 158 if (rate == -1) { 159 /* No matching basic rate found; use highest suitable mandatory 160 * PHY rate */ 161 rate = mrate; 162 } 163 164 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 165 if (ieee80211_is_data_qos(hdr->frame_control) && 166 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 167 dur = 0; 168 else 169 /* Time needed to transmit ACK 170 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 171 * to closest integer */ 172 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 173 tx->sdata->vif.bss_conf.use_short_preamble); 174 175 if (next_frag_len) { 176 /* Frame is fragmented: duration increases with time needed to 177 * transmit next fragment plus ACK and 2 x SIFS. */ 178 dur *= 2; /* ACK + SIFS */ 179 /* next fragment */ 180 dur += ieee80211_frame_duration(sband->band, next_frag_len, 181 txrate->bitrate, erp, 182 tx->sdata->vif.bss_conf.use_short_preamble); 183 } 184 185 return cpu_to_le16(dur); 186 } 187 188 /* tx handlers */ 189 static ieee80211_tx_result debug_noinline 190 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 191 { 192 struct ieee80211_local *local = tx->local; 193 struct ieee80211_if_managed *ifmgd; 194 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 195 196 /* driver doesn't support power save */ 197 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 198 return TX_CONTINUE; 199 200 /* hardware does dynamic power save */ 201 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 202 return TX_CONTINUE; 203 204 /* dynamic power save disabled */ 205 if (local->hw.conf.dynamic_ps_timeout <= 0) 206 return TX_CONTINUE; 207 208 /* we are scanning, don't enable power save */ 209 if (local->scanning) 210 return TX_CONTINUE; 211 212 if (!local->ps_sdata) 213 return TX_CONTINUE; 214 215 /* No point if we're going to suspend */ 216 if (local->quiescing) 217 return TX_CONTINUE; 218 219 /* dynamic ps is supported only in managed mode */ 220 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 221 return TX_CONTINUE; 222 223 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 224 return TX_CONTINUE; 225 226 ifmgd = &tx->sdata->u.mgd; 227 228 /* 229 * Don't wakeup from power save if u-apsd is enabled, voip ac has 230 * u-apsd enabled and the frame is in voip class. This effectively 231 * means that even if all access categories have u-apsd enabled, in 232 * practise u-apsd is only used with the voip ac. This is a 233 * workaround for the case when received voip class packets do not 234 * have correct qos tag for some reason, due the network or the 235 * peer application. 236 * 237 * Note: ifmgd->uapsd_queues access is racy here. If the value is 238 * changed via debugfs, user needs to reassociate manually to have 239 * everything in sync. 240 */ 241 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 242 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 243 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 244 return TX_CONTINUE; 245 246 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 247 ieee80211_stop_queues_by_reason(&local->hw, 248 IEEE80211_MAX_QUEUE_MAP, 249 IEEE80211_QUEUE_STOP_REASON_PS, 250 false); 251 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 252 wiphy_work_queue(local->hw.wiphy, 253 &local->dynamic_ps_disable_work); 254 } 255 256 /* Don't restart the timer if we're not disassociated */ 257 if (!ifmgd->associated) 258 return TX_CONTINUE; 259 260 mod_timer(&local->dynamic_ps_timer, jiffies + 261 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 262 263 return TX_CONTINUE; 264 } 265 266 static ieee80211_tx_result debug_noinline 267 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 268 { 269 270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 271 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 272 bool assoc = false; 273 274 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 275 return TX_CONTINUE; 276 277 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 278 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 279 !ieee80211_is_probe_req(hdr->frame_control) && 280 !ieee80211_is_any_nullfunc(hdr->frame_control)) 281 /* 282 * When software scanning only nullfunc frames (to notify 283 * the sleep state to the AP) and probe requests (for the 284 * active scan) are allowed, all other frames should not be 285 * sent and we should not get here, but if we do 286 * nonetheless, drop them to avoid sending them 287 * off-channel. See the link below and 288 * ieee80211_start_scan() for more. 289 * 290 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 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 tx->key = NULL; 642 else 643 skip_hw = (tx->key->conf.flags & 644 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 645 ieee80211_is_mgmt(hdr->frame_control); 646 break; 647 case WLAN_CIPHER_SUITE_AES_CMAC: 648 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 649 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 650 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 651 if (!ieee80211_is_mgmt(hdr->frame_control)) 652 tx->key = NULL; 653 break; 654 } 655 656 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 657 !ieee80211_is_deauth(hdr->frame_control)) && 658 tx->skb->protocol != tx->sdata->control_port_protocol) 659 return TX_DROP; 660 661 if (!skip_hw && tx->key && 662 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 663 info->control.hw_key = &tx->key->conf; 664 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 665 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 666 return TX_DROP; 667 } 668 669 return TX_CONTINUE; 670 } 671 672 static ieee80211_tx_result debug_noinline 673 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 674 { 675 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 676 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 677 struct ieee80211_supported_band *sband; 678 u32 len; 679 struct ieee80211_tx_rate_control txrc; 680 struct ieee80211_sta_rates *ratetbl = NULL; 681 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 682 bool assoc = false; 683 684 memset(&txrc, 0, sizeof(txrc)); 685 686 sband = tx->local->hw.wiphy->bands[info->band]; 687 688 len = min_t(u32, tx->skb->len + FCS_LEN, 689 tx->local->hw.wiphy->frag_threshold); 690 691 /* set up the tx rate control struct we give the RC algo */ 692 txrc.hw = &tx->local->hw; 693 txrc.sband = sband; 694 txrc.bss_conf = &tx->sdata->vif.bss_conf; 695 txrc.skb = tx->skb; 696 txrc.reported_rate.idx = -1; 697 698 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 699 txrc.rate_idx_mask = ~0; 700 } else { 701 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 702 703 if (tx->sdata->rc_has_mcs_mask[info->band]) 704 txrc.rate_idx_mcs_mask = 705 tx->sdata->rc_rateidx_mcs_mask[info->band]; 706 } 707 708 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 709 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 710 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 711 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 712 713 /* set up RTS protection if desired */ 714 if (len > tx->local->hw.wiphy->rts_threshold) { 715 txrc.rts = true; 716 } 717 718 info->control.use_rts = txrc.rts; 719 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 720 721 /* 722 * Use short preamble if the BSS can handle it, but not for 723 * management frames unless we know the receiver can handle 724 * that -- the management frame might be to a station that 725 * just wants a probe response. 726 */ 727 if (tx->sdata->vif.bss_conf.use_short_preamble && 728 (ieee80211_is_tx_data(tx->skb) || 729 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 730 txrc.short_preamble = true; 731 732 info->control.short_preamble = txrc.short_preamble; 733 734 /* don't ask rate control when rate already injected via radiotap */ 735 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 736 return TX_CONTINUE; 737 738 if (tx->sta) 739 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 740 741 /* 742 * Lets not bother rate control if we're associated and cannot 743 * talk to the sta. This should not happen. 744 */ 745 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 746 !rate_usable_index_exists(sband, &tx->sta->sta), 747 "%s: Dropped data frame as no usable bitrate found while " 748 "scanning and associated. Target station: " 749 "%pM on %d GHz band\n", 750 tx->sdata->name, 751 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 752 info->band ? 5 : 2)) 753 return TX_DROP; 754 755 /* 756 * If we're associated with the sta at this point we know we can at 757 * least send the frame at the lowest bit rate. 758 */ 759 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 760 761 if (tx->sta && !info->control.skip_table) 762 ratetbl = rcu_dereference(tx->sta->sta.rates); 763 764 if (unlikely(info->control.rates[0].idx < 0)) { 765 if (ratetbl) { 766 struct ieee80211_tx_rate rate = { 767 .idx = ratetbl->rate[0].idx, 768 .flags = ratetbl->rate[0].flags, 769 .count = ratetbl->rate[0].count 770 }; 771 772 if (ratetbl->rate[0].idx < 0) 773 return TX_DROP; 774 775 tx->rate = rate; 776 } else { 777 return TX_DROP; 778 } 779 } else { 780 tx->rate = info->control.rates[0]; 781 } 782 783 if (txrc.reported_rate.idx < 0) { 784 txrc.reported_rate = tx->rate; 785 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 786 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 787 } else if (tx->sta) 788 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 789 790 if (ratetbl) 791 return TX_CONTINUE; 792 793 if (unlikely(!info->control.rates[0].count)) 794 info->control.rates[0].count = 1; 795 796 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 797 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 798 info->control.rates[0].count = 1; 799 800 return TX_CONTINUE; 801 } 802 803 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 804 { 805 u16 *seq = &sta->tid_seq[tid]; 806 __le16 ret = cpu_to_le16(*seq); 807 808 /* Increase the sequence number. */ 809 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 810 811 return ret; 812 } 813 814 static ieee80211_tx_result debug_noinline 815 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 816 { 817 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 818 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 819 int tid; 820 821 /* 822 * Packet injection may want to control the sequence 823 * number, if we have no matching interface then we 824 * neither assign one ourselves nor ask the driver to. 825 */ 826 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 827 return TX_CONTINUE; 828 829 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 830 return TX_CONTINUE; 831 832 if (ieee80211_hdrlen(hdr->frame_control) < 24) 833 return TX_CONTINUE; 834 835 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 836 return TX_CONTINUE; 837 838 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 839 return TX_CONTINUE; 840 841 /* SNS11 from 802.11be 10.3.2.14 */ 842 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 843 ieee80211_vif_is_mld(info->control.vif) && 844 info->control.vif->type == NL80211_IFTYPE_AP)) { 845 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 846 tx->sdata->mld_mcast_seq += 0x10; 847 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 848 return TX_CONTINUE; 849 } 850 851 /* 852 * Anything but QoS data that has a sequence number field 853 * (is long enough) gets a sequence number from the global 854 * counter. QoS data frames with a multicast destination 855 * also use the global counter (802.11-2012 9.3.2.10). 856 */ 857 if (!ieee80211_is_data_qos(hdr->frame_control) || 858 is_multicast_ether_addr(hdr->addr1)) { 859 /* driver should assign sequence number */ 860 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 861 /* for pure STA mode without beacons, we can do it */ 862 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 863 tx->sdata->sequence_number += 0x10; 864 if (tx->sta) 865 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 866 return TX_CONTINUE; 867 } 868 869 /* 870 * This should be true for injected/management frames only, for 871 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 872 * above since they are not QoS-data frames. 873 */ 874 if (!tx->sta) 875 return TX_CONTINUE; 876 877 /* include per-STA, per-TID sequence counter */ 878 tid = ieee80211_get_tid(hdr); 879 tx->sta->deflink.tx_stats.msdu[tid]++; 880 881 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 882 883 return TX_CONTINUE; 884 } 885 886 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 887 struct sk_buff *skb, int hdrlen, 888 int frag_threshold) 889 { 890 struct ieee80211_local *local = tx->local; 891 struct ieee80211_tx_info *info; 892 struct sk_buff *tmp; 893 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 894 int pos = hdrlen + per_fragm; 895 int rem = skb->len - hdrlen - per_fragm; 896 897 if (WARN_ON(rem < 0)) 898 return -EINVAL; 899 900 /* first fragment was already added to queue by caller */ 901 902 while (rem) { 903 int fraglen = per_fragm; 904 905 if (fraglen > rem) 906 fraglen = rem; 907 rem -= fraglen; 908 tmp = dev_alloc_skb(local->tx_headroom + 909 frag_threshold + 910 IEEE80211_ENCRYPT_HEADROOM + 911 IEEE80211_ENCRYPT_TAILROOM); 912 if (!tmp) 913 return -ENOMEM; 914 915 __skb_queue_tail(&tx->skbs, tmp); 916 917 skb_reserve(tmp, 918 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 919 920 /* copy control information */ 921 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 922 923 info = IEEE80211_SKB_CB(tmp); 924 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 925 IEEE80211_TX_CTL_FIRST_FRAGMENT); 926 927 if (rem) 928 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 929 930 skb_copy_queue_mapping(tmp, skb); 931 tmp->priority = skb->priority; 932 tmp->dev = skb->dev; 933 934 /* copy header and data */ 935 skb_put_data(tmp, skb->data, hdrlen); 936 skb_put_data(tmp, skb->data + pos, fraglen); 937 938 pos += fraglen; 939 } 940 941 /* adjust first fragment's length */ 942 skb_trim(skb, hdrlen + per_fragm); 943 return 0; 944 } 945 946 static ieee80211_tx_result debug_noinline 947 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 948 { 949 struct sk_buff *skb = tx->skb; 950 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 951 struct ieee80211_hdr *hdr = (void *)skb->data; 952 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 953 int hdrlen; 954 int fragnum; 955 956 /* no matter what happens, tx->skb moves to tx->skbs */ 957 __skb_queue_tail(&tx->skbs, skb); 958 tx->skb = NULL; 959 960 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 961 return TX_CONTINUE; 962 963 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 964 return TX_CONTINUE; 965 966 /* 967 * Warn when submitting a fragmented A-MPDU frame and drop it. 968 * This scenario is handled in ieee80211_tx_prepare but extra 969 * caution taken here as fragmented ampdu may cause Tx stop. 970 */ 971 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 972 return TX_DROP; 973 974 hdrlen = ieee80211_hdrlen(hdr->frame_control); 975 976 /* internal error, why isn't DONTFRAG set? */ 977 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 978 return TX_DROP; 979 980 /* 981 * Now fragment the frame. This will allocate all the fragments and 982 * chain them (using skb as the first fragment) to skb->next. 983 * During transmission, we will remove the successfully transmitted 984 * fragments from this list. When the low-level driver rejects one 985 * of the fragments then we will simply pretend to accept the skb 986 * but store it away as pending. 987 */ 988 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 989 return TX_DROP; 990 991 /* update duration/seq/flags of fragments */ 992 fragnum = 0; 993 994 skb_queue_walk(&tx->skbs, skb) { 995 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 996 997 hdr = (void *)skb->data; 998 info = IEEE80211_SKB_CB(skb); 999 1000 if (!skb_queue_is_last(&tx->skbs, skb)) { 1001 hdr->frame_control |= morefrags; 1002 /* 1003 * No multi-rate retries for fragmented frames, that 1004 * would completely throw off the NAV at other STAs. 1005 */ 1006 info->control.rates[1].idx = -1; 1007 info->control.rates[2].idx = -1; 1008 info->control.rates[3].idx = -1; 1009 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1010 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1011 } else { 1012 hdr->frame_control &= ~morefrags; 1013 } 1014 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1015 fragnum++; 1016 } 1017 1018 return TX_CONTINUE; 1019 } 1020 1021 static ieee80211_tx_result debug_noinline 1022 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1023 { 1024 struct sk_buff *skb; 1025 int ac = -1; 1026 1027 if (!tx->sta) 1028 return TX_CONTINUE; 1029 1030 skb_queue_walk(&tx->skbs, skb) { 1031 ac = skb_get_queue_mapping(skb); 1032 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1033 } 1034 if (ac >= 0) 1035 tx->sta->deflink.tx_stats.packets[ac]++; 1036 1037 return TX_CONTINUE; 1038 } 1039 1040 static ieee80211_tx_result debug_noinline 1041 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1042 { 1043 if (!tx->key) 1044 return TX_CONTINUE; 1045 1046 switch (tx->key->conf.cipher) { 1047 case WLAN_CIPHER_SUITE_WEP40: 1048 case WLAN_CIPHER_SUITE_WEP104: 1049 return ieee80211_crypto_wep_encrypt(tx); 1050 case WLAN_CIPHER_SUITE_TKIP: 1051 return ieee80211_crypto_tkip_encrypt(tx); 1052 case WLAN_CIPHER_SUITE_CCMP: 1053 return ieee80211_crypto_ccmp_encrypt( 1054 tx, IEEE80211_CCMP_MIC_LEN); 1055 case WLAN_CIPHER_SUITE_CCMP_256: 1056 return ieee80211_crypto_ccmp_encrypt( 1057 tx, IEEE80211_CCMP_256_MIC_LEN); 1058 case WLAN_CIPHER_SUITE_AES_CMAC: 1059 return ieee80211_crypto_aes_cmac_encrypt(tx); 1060 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1061 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1062 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1063 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1064 return ieee80211_crypto_aes_gmac_encrypt(tx); 1065 case WLAN_CIPHER_SUITE_GCMP: 1066 case WLAN_CIPHER_SUITE_GCMP_256: 1067 return ieee80211_crypto_gcmp_encrypt(tx); 1068 } 1069 1070 return TX_DROP; 1071 } 1072 1073 static ieee80211_tx_result debug_noinline 1074 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1075 { 1076 struct sk_buff *skb; 1077 struct ieee80211_hdr *hdr; 1078 int next_len; 1079 bool group_addr; 1080 1081 skb_queue_walk(&tx->skbs, skb) { 1082 hdr = (void *) skb->data; 1083 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1084 break; /* must not overwrite AID */ 1085 if (!skb_queue_is_last(&tx->skbs, skb)) { 1086 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1087 next_len = next->len; 1088 } else 1089 next_len = 0; 1090 group_addr = is_multicast_ether_addr(hdr->addr1); 1091 1092 hdr->duration_id = 1093 ieee80211_duration(tx, skb, group_addr, next_len); 1094 } 1095 1096 return TX_CONTINUE; 1097 } 1098 1099 /* actual transmit path */ 1100 1101 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1102 struct sk_buff *skb, 1103 struct ieee80211_tx_info *info, 1104 struct tid_ampdu_tx *tid_tx, 1105 int tid) 1106 { 1107 bool queued = false; 1108 bool reset_agg_timer = false; 1109 struct sk_buff *purge_skb = NULL; 1110 1111 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1112 reset_agg_timer = true; 1113 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1114 /* 1115 * nothing -- this aggregation session is being started 1116 * but that might still fail with the driver 1117 */ 1118 } else if (!tx->sta->sta.txq[tid]) { 1119 spin_lock(&tx->sta->lock); 1120 /* 1121 * Need to re-check now, because we may get here 1122 * 1123 * 1) in the window during which the setup is actually 1124 * already done, but not marked yet because not all 1125 * packets are spliced over to the driver pending 1126 * queue yet -- if this happened we acquire the lock 1127 * either before or after the splice happens, but 1128 * need to recheck which of these cases happened. 1129 * 1130 * 2) during session teardown, if the OPERATIONAL bit 1131 * was cleared due to the teardown but the pointer 1132 * hasn't been assigned NULL yet (or we loaded it 1133 * before it was assigned) -- in this case it may 1134 * now be NULL which means we should just let the 1135 * packet pass through because splicing the frames 1136 * back is already done. 1137 */ 1138 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1139 1140 if (!tid_tx) { 1141 /* do nothing, let packet pass through */ 1142 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1143 reset_agg_timer = true; 1144 } else { 1145 queued = true; 1146 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1147 clear_sta_flag(tx->sta, WLAN_STA_SP); 1148 ps_dbg(tx->sta->sdata, 1149 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1150 tx->sta->sta.addr, tx->sta->sta.aid); 1151 } 1152 info->control.vif = &tx->sdata->vif; 1153 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1154 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1155 __skb_queue_tail(&tid_tx->pending, skb); 1156 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1157 purge_skb = __skb_dequeue(&tid_tx->pending); 1158 } 1159 spin_unlock(&tx->sta->lock); 1160 1161 if (purge_skb) 1162 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1163 } 1164 1165 /* reset session timer */ 1166 if (reset_agg_timer) 1167 tid_tx->last_tx = jiffies; 1168 1169 return queued; 1170 } 1171 1172 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1173 struct sta_info *sta, struct sk_buff *skb) 1174 { 1175 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1176 u16 tid; 1177 1178 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1179 return; 1180 1181 if (!sta || 1182 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1183 !sta->sta.deflink.s1g_cap.s1g) || 1184 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1185 skb->protocol == sdata->control_port_protocol) 1186 return; 1187 1188 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1189 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1190 return; 1191 1192 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1193 } 1194 1195 /* 1196 * initialises @tx 1197 * pass %NULL for the station if unknown, a valid pointer if known 1198 * or an ERR_PTR() if the station is known not to exist 1199 */ 1200 static ieee80211_tx_result 1201 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1202 struct ieee80211_tx_data *tx, 1203 struct sta_info *sta, struct sk_buff *skb) 1204 { 1205 struct ieee80211_local *local = sdata->local; 1206 struct ieee80211_hdr *hdr; 1207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1208 bool aggr_check = false; 1209 int tid; 1210 1211 memset(tx, 0, sizeof(*tx)); 1212 tx->skb = skb; 1213 tx->local = local; 1214 tx->sdata = sdata; 1215 __skb_queue_head_init(&tx->skbs); 1216 1217 /* 1218 * If this flag is set to true anywhere, and we get here, 1219 * we are doing the needed processing, so remove the flag 1220 * now. 1221 */ 1222 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1223 1224 hdr = (struct ieee80211_hdr *) skb->data; 1225 1226 if (likely(sta)) { 1227 if (!IS_ERR(sta)) 1228 tx->sta = sta; 1229 } else { 1230 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1231 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1232 if (!tx->sta && sdata->wdev.use_4addr) 1233 return TX_DROP; 1234 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1235 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1236 } 1237 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1238 tx->sta = sta_info_get(sdata, hdr->addr1); 1239 aggr_check = true; 1240 } 1241 } 1242 1243 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1244 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1245 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1246 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1247 struct tid_ampdu_tx *tid_tx; 1248 1249 tid = ieee80211_get_tid(hdr); 1250 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1251 if (!tid_tx && aggr_check) { 1252 ieee80211_aggr_check(sdata, tx->sta, skb); 1253 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1254 } 1255 1256 if (tid_tx) { 1257 bool queued; 1258 1259 queued = ieee80211_tx_prep_agg(tx, skb, info, 1260 tid_tx, tid); 1261 1262 if (unlikely(queued)) 1263 return TX_QUEUED; 1264 } 1265 } 1266 1267 if (is_multicast_ether_addr(hdr->addr1)) { 1268 tx->flags &= ~IEEE80211_TX_UNICAST; 1269 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1270 } else 1271 tx->flags |= IEEE80211_TX_UNICAST; 1272 1273 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1274 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1275 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1276 info->flags & IEEE80211_TX_CTL_AMPDU) 1277 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1278 } 1279 1280 if (!tx->sta) 1281 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1282 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1283 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1284 ieee80211_check_fast_xmit(tx->sta); 1285 } 1286 1287 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1288 1289 return TX_CONTINUE; 1290 } 1291 1292 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1293 struct ieee80211_vif *vif, 1294 struct sta_info *sta, 1295 struct sk_buff *skb) 1296 { 1297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1298 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1299 struct ieee80211_txq *txq = NULL; 1300 1301 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1302 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1303 return NULL; 1304 1305 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1306 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1307 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1308 ieee80211_is_bufferable_mmpdu(skb) || 1309 vif->type == NL80211_IFTYPE_STATION) && 1310 sta && sta->uploaded) { 1311 /* 1312 * This will be NULL if the driver didn't set the 1313 * opt-in hardware flag. 1314 */ 1315 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1316 } 1317 } else if (sta) { 1318 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1319 1320 if (!sta->uploaded) 1321 return NULL; 1322 1323 txq = sta->sta.txq[tid]; 1324 } else { 1325 txq = vif->txq; 1326 } 1327 1328 if (!txq) 1329 return NULL; 1330 1331 return to_txq_info(txq); 1332 } 1333 1334 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1335 { 1336 struct sk_buff *next; 1337 codel_time_t now = codel_get_time(); 1338 1339 skb_list_walk_safe(skb, skb, next) 1340 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1341 } 1342 1343 static u32 codel_skb_len_func(const struct sk_buff *skb) 1344 { 1345 return skb->len; 1346 } 1347 1348 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1349 { 1350 const struct ieee80211_tx_info *info; 1351 1352 info = (const struct ieee80211_tx_info *)skb->cb; 1353 return info->control.enqueue_time; 1354 } 1355 1356 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1357 void *ctx) 1358 { 1359 struct ieee80211_local *local; 1360 struct txq_info *txqi; 1361 struct fq *fq; 1362 struct fq_flow *flow; 1363 1364 txqi = ctx; 1365 local = vif_to_sdata(txqi->txq.vif)->local; 1366 fq = &local->fq; 1367 1368 if (cvars == &txqi->def_cvars) 1369 flow = &txqi->tin.default_flow; 1370 else 1371 flow = &fq->flows[cvars - local->cvars]; 1372 1373 return fq_flow_dequeue(fq, flow); 1374 } 1375 1376 static void codel_drop_func(struct sk_buff *skb, 1377 void *ctx) 1378 { 1379 struct ieee80211_local *local; 1380 struct ieee80211_hw *hw; 1381 struct txq_info *txqi; 1382 1383 txqi = ctx; 1384 local = vif_to_sdata(txqi->txq.vif)->local; 1385 hw = &local->hw; 1386 1387 ieee80211_free_txskb(hw, skb); 1388 } 1389 1390 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1391 struct fq_tin *tin, 1392 struct fq_flow *flow) 1393 { 1394 struct ieee80211_local *local; 1395 struct txq_info *txqi; 1396 struct codel_vars *cvars; 1397 struct codel_params *cparams; 1398 struct codel_stats *cstats; 1399 1400 local = container_of(fq, struct ieee80211_local, fq); 1401 txqi = container_of(tin, struct txq_info, tin); 1402 cparams = &local->cparams; 1403 cstats = &txqi->cstats; 1404 1405 if (flow == &tin->default_flow) 1406 cvars = &txqi->def_cvars; 1407 else 1408 cvars = &local->cvars[flow - fq->flows]; 1409 1410 return codel_dequeue(txqi, 1411 &flow->backlog, 1412 cparams, 1413 cvars, 1414 cstats, 1415 codel_skb_len_func, 1416 codel_skb_time_func, 1417 codel_drop_func, 1418 codel_dequeue_func); 1419 } 1420 1421 static void fq_skb_free_func(struct fq *fq, 1422 struct fq_tin *tin, 1423 struct fq_flow *flow, 1424 struct sk_buff *skb) 1425 { 1426 struct ieee80211_local *local; 1427 1428 local = container_of(fq, struct ieee80211_local, fq); 1429 ieee80211_free_txskb(&local->hw, skb); 1430 } 1431 1432 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1433 struct txq_info *txqi, 1434 struct sk_buff *skb) 1435 { 1436 struct fq *fq = &local->fq; 1437 struct fq_tin *tin = &txqi->tin; 1438 u32 flow_idx; 1439 1440 ieee80211_set_skb_enqueue_time(skb); 1441 1442 spin_lock_bh(&fq->lock); 1443 /* 1444 * For management frames, don't really apply codel etc., 1445 * we don't want to apply any shaping or anything we just 1446 * want to simplify the driver API by having them on the 1447 * txqi. 1448 */ 1449 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1450 IEEE80211_SKB_CB(skb)->control.flags |= 1451 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1452 __skb_queue_tail(&txqi->frags, skb); 1453 } else { 1454 flow_idx = fq_flow_idx(fq, skb); 1455 fq_tin_enqueue(fq, tin, flow_idx, skb, 1456 fq_skb_free_func); 1457 } 1458 spin_unlock_bh(&fq->lock); 1459 } 1460 1461 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1462 struct fq_flow *flow, struct sk_buff *skb, 1463 void *data) 1464 { 1465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1466 1467 return info->control.vif == data; 1468 } 1469 1470 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1471 struct ieee80211_sub_if_data *sdata) 1472 { 1473 struct fq *fq = &local->fq; 1474 struct txq_info *txqi; 1475 struct fq_tin *tin; 1476 struct ieee80211_sub_if_data *ap; 1477 1478 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1479 return; 1480 1481 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1482 1483 if (!ap->vif.txq) 1484 return; 1485 1486 txqi = to_txq_info(ap->vif.txq); 1487 tin = &txqi->tin; 1488 1489 spin_lock_bh(&fq->lock); 1490 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1491 fq_skb_free_func); 1492 spin_unlock_bh(&fq->lock); 1493 } 1494 1495 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1496 struct sta_info *sta, 1497 struct txq_info *txqi, int tid) 1498 { 1499 fq_tin_init(&txqi->tin); 1500 codel_vars_init(&txqi->def_cvars); 1501 codel_stats_init(&txqi->cstats); 1502 __skb_queue_head_init(&txqi->frags); 1503 INIT_LIST_HEAD(&txqi->schedule_order); 1504 1505 txqi->txq.vif = &sdata->vif; 1506 1507 if (!sta) { 1508 sdata->vif.txq = &txqi->txq; 1509 txqi->txq.tid = 0; 1510 txqi->txq.ac = IEEE80211_AC_BE; 1511 1512 return; 1513 } 1514 1515 if (tid == IEEE80211_NUM_TIDS) { 1516 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1517 /* Drivers need to opt in to the management MPDU TXQ */ 1518 if (!ieee80211_hw_check(&sdata->local->hw, 1519 STA_MMPDU_TXQ)) 1520 return; 1521 } else if (!ieee80211_hw_check(&sdata->local->hw, 1522 BUFF_MMPDU_TXQ)) { 1523 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1524 return; 1525 } 1526 txqi->txq.ac = IEEE80211_AC_VO; 1527 } else { 1528 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1529 } 1530 1531 txqi->txq.sta = &sta->sta; 1532 txqi->txq.tid = tid; 1533 sta->sta.txq[tid] = &txqi->txq; 1534 } 1535 1536 void ieee80211_txq_purge(struct ieee80211_local *local, 1537 struct txq_info *txqi) 1538 { 1539 struct fq *fq = &local->fq; 1540 struct fq_tin *tin = &txqi->tin; 1541 1542 spin_lock_bh(&fq->lock); 1543 fq_tin_reset(fq, tin, fq_skb_free_func); 1544 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1545 spin_unlock_bh(&fq->lock); 1546 1547 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1548 list_del_init(&txqi->schedule_order); 1549 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1550 } 1551 1552 void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx) 1553 { 1554 if (local->hw.wiphy->txq_limit) 1555 local->fq.limit = local->hw.wiphy->txq_limit; 1556 else 1557 local->hw.wiphy->txq_limit = local->fq.limit; 1558 1559 if (local->hw.wiphy->txq_memory_limit) 1560 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1561 else 1562 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1563 1564 if (local->hw.wiphy->txq_quantum) 1565 local->fq.quantum = local->hw.wiphy->txq_quantum; 1566 else 1567 local->hw.wiphy->txq_quantum = local->fq.quantum; 1568 } 1569 1570 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1571 { 1572 struct fq *fq = &local->fq; 1573 int ret; 1574 int i; 1575 bool supp_vht = false; 1576 enum nl80211_band band; 1577 1578 ret = fq_init(fq, 4096); 1579 if (ret) 1580 return ret; 1581 1582 /* 1583 * If the hardware doesn't support VHT, it is safe to limit the maximum 1584 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1585 */ 1586 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1587 struct ieee80211_supported_band *sband; 1588 1589 sband = local->hw.wiphy->bands[band]; 1590 if (!sband) 1591 continue; 1592 1593 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1594 } 1595 1596 if (!supp_vht) 1597 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1598 1599 codel_params_init(&local->cparams); 1600 local->cparams.interval = MS2TIME(100); 1601 local->cparams.target = MS2TIME(20); 1602 local->cparams.ecn = true; 1603 1604 local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1605 GFP_KERNEL); 1606 if (!local->cvars) { 1607 spin_lock_bh(&fq->lock); 1608 fq_reset(fq, fq_skb_free_func); 1609 spin_unlock_bh(&fq->lock); 1610 return -ENOMEM; 1611 } 1612 1613 for (i = 0; i < fq->flows_cnt; i++) 1614 codel_vars_init(&local->cvars[i]); 1615 1616 ieee80211_txq_set_params(local, -1); 1617 1618 return 0; 1619 } 1620 1621 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1622 { 1623 struct fq *fq = &local->fq; 1624 1625 kvfree(local->cvars); 1626 local->cvars = NULL; 1627 1628 spin_lock_bh(&fq->lock); 1629 fq_reset(fq, fq_skb_free_func); 1630 spin_unlock_bh(&fq->lock); 1631 } 1632 1633 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1634 struct ieee80211_sub_if_data *sdata, 1635 struct sta_info *sta, 1636 struct sk_buff *skb) 1637 { 1638 struct ieee80211_vif *vif; 1639 struct txq_info *txqi; 1640 1641 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1642 return false; 1643 1644 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1645 sdata = container_of(sdata->bss, 1646 struct ieee80211_sub_if_data, u.ap); 1647 1648 vif = &sdata->vif; 1649 txqi = ieee80211_get_txq(local, vif, sta, skb); 1650 1651 if (!txqi) 1652 return false; 1653 1654 ieee80211_txq_enqueue(local, txqi, skb); 1655 1656 schedule_and_wake_txq(local, txqi); 1657 1658 return true; 1659 } 1660 1661 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1662 struct ieee80211_vif *vif, 1663 struct sta_info *sta, 1664 struct sk_buff_head *skbs, 1665 bool txpending) 1666 { 1667 struct ieee80211_tx_control control = {}; 1668 struct sk_buff *skb, *tmp; 1669 unsigned long flags; 1670 1671 skb_queue_walk_safe(skbs, skb, tmp) { 1672 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1673 int q = info->hw_queue; 1674 1675 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1676 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1677 __skb_unlink(skb, skbs); 1678 ieee80211_free_txskb(&local->hw, skb); 1679 continue; 1680 } 1681 #endif 1682 1683 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1684 if (local->queue_stop_reasons[q] || 1685 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1686 if (unlikely(info->flags & 1687 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1688 if (local->queue_stop_reasons[q] & 1689 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1690 /* 1691 * Drop off-channel frames if queues 1692 * are stopped for any reason other 1693 * than off-channel operation. Never 1694 * queue them. 1695 */ 1696 spin_unlock_irqrestore( 1697 &local->queue_stop_reason_lock, 1698 flags); 1699 ieee80211_purge_tx_queue(&local->hw, 1700 skbs); 1701 return true; 1702 } 1703 } else { 1704 1705 /* 1706 * Since queue is stopped, queue up frames for 1707 * later transmission from the tx-pending 1708 * tasklet when the queue is woken again. 1709 */ 1710 if (txpending) 1711 skb_queue_splice_init(skbs, 1712 &local->pending[q]); 1713 else 1714 skb_queue_splice_tail_init(skbs, 1715 &local->pending[q]); 1716 1717 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1718 flags); 1719 return false; 1720 } 1721 } 1722 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1723 1724 info->control.vif = vif; 1725 control.sta = sta ? &sta->sta : NULL; 1726 1727 __skb_unlink(skb, skbs); 1728 drv_tx(local, &control, skb); 1729 } 1730 1731 return true; 1732 } 1733 1734 /* 1735 * Returns false if the frame couldn't be transmitted but was queued instead. 1736 */ 1737 static bool __ieee80211_tx(struct ieee80211_local *local, 1738 struct sk_buff_head *skbs, struct sta_info *sta, 1739 bool txpending) 1740 { 1741 struct ieee80211_tx_info *info; 1742 struct ieee80211_sub_if_data *sdata; 1743 struct ieee80211_vif *vif; 1744 struct sk_buff *skb; 1745 bool result; 1746 1747 if (WARN_ON(skb_queue_empty(skbs))) 1748 return true; 1749 1750 skb = skb_peek(skbs); 1751 info = IEEE80211_SKB_CB(skb); 1752 sdata = vif_to_sdata(info->control.vif); 1753 if (sta && !sta->uploaded) 1754 sta = NULL; 1755 1756 switch (sdata->vif.type) { 1757 case NL80211_IFTYPE_MONITOR: 1758 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1759 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1760 vif = &sdata->vif; 1761 break; 1762 } 1763 sdata = rcu_dereference(local->monitor_sdata); 1764 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1765 vif = &sdata->vif; 1766 info->hw_queue = 1767 vif->hw_queue[skb_get_queue_mapping(skb)]; 1768 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1769 ieee80211_purge_tx_queue(&local->hw, skbs); 1770 return true; 1771 } else 1772 vif = NULL; 1773 break; 1774 case NL80211_IFTYPE_AP_VLAN: 1775 sdata = container_of(sdata->bss, 1776 struct ieee80211_sub_if_data, u.ap); 1777 fallthrough; 1778 default: 1779 vif = &sdata->vif; 1780 break; 1781 } 1782 1783 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1784 1785 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1786 1787 return result; 1788 } 1789 1790 /* 1791 * Invoke TX handlers, return 0 on success and non-zero if the 1792 * frame was dropped or queued. 1793 * 1794 * The handlers are split into an early and late part. The latter is everything 1795 * that can be sensitive to reordering, and will be deferred to after packets 1796 * are dequeued from the intermediate queues (when they are enabled). 1797 */ 1798 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1799 { 1800 ieee80211_tx_result res = TX_DROP; 1801 1802 #define CALL_TXH(txh) \ 1803 do { \ 1804 res = txh(tx); \ 1805 if (res != TX_CONTINUE) \ 1806 goto txh_done; \ 1807 } while (0) 1808 1809 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1810 CALL_TXH(ieee80211_tx_h_check_assoc); 1811 CALL_TXH(ieee80211_tx_h_ps_buf); 1812 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1813 CALL_TXH(ieee80211_tx_h_select_key); 1814 1815 txh_done: 1816 if (unlikely(res == TX_DROP)) { 1817 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1818 if (tx->skb) 1819 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1820 else 1821 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1822 return -1; 1823 } else if (unlikely(res == TX_QUEUED)) { 1824 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1825 return -1; 1826 } 1827 1828 return 0; 1829 } 1830 1831 /* 1832 * Late handlers can be called while the sta lock is held. Handlers that can 1833 * cause packets to be generated will cause deadlock! 1834 */ 1835 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1836 { 1837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1838 ieee80211_tx_result res = TX_CONTINUE; 1839 1840 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1841 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1842 1843 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1844 __skb_queue_tail(&tx->skbs, tx->skb); 1845 tx->skb = NULL; 1846 goto txh_done; 1847 } 1848 1849 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1850 CALL_TXH(ieee80211_tx_h_sequence); 1851 CALL_TXH(ieee80211_tx_h_fragment); 1852 /* handlers after fragment must be aware of tx info fragmentation! */ 1853 CALL_TXH(ieee80211_tx_h_stats); 1854 CALL_TXH(ieee80211_tx_h_encrypt); 1855 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1856 CALL_TXH(ieee80211_tx_h_calculate_duration); 1857 #undef CALL_TXH 1858 1859 txh_done: 1860 if (unlikely(res == TX_DROP)) { 1861 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1862 if (tx->skb) 1863 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1864 else 1865 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1866 return -1; 1867 } else if (unlikely(res == TX_QUEUED)) { 1868 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1869 return -1; 1870 } 1871 1872 return 0; 1873 } 1874 1875 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1876 { 1877 int r = invoke_tx_handlers_early(tx); 1878 1879 if (r) 1880 return r; 1881 return invoke_tx_handlers_late(tx); 1882 } 1883 1884 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1885 struct ieee80211_vif *vif, struct sk_buff *skb, 1886 int band, struct ieee80211_sta **sta) 1887 { 1888 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1889 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1890 struct ieee80211_tx_data tx; 1891 struct sk_buff *skb2; 1892 1893 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1894 return false; 1895 1896 info->band = band; 1897 info->control.vif = vif; 1898 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1899 1900 if (invoke_tx_handlers(&tx)) 1901 return false; 1902 1903 if (sta) { 1904 if (tx.sta) 1905 *sta = &tx.sta->sta; 1906 else 1907 *sta = NULL; 1908 } 1909 1910 /* this function isn't suitable for fragmented data frames */ 1911 skb2 = __skb_dequeue(&tx.skbs); 1912 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1913 ieee80211_free_txskb(hw, skb2); 1914 ieee80211_purge_tx_queue(hw, &tx.skbs); 1915 return false; 1916 } 1917 1918 return true; 1919 } 1920 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1921 1922 /* 1923 * Returns false if the frame couldn't be transmitted but was queued instead. 1924 */ 1925 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1926 struct sta_info *sta, struct sk_buff *skb, 1927 bool txpending) 1928 { 1929 struct ieee80211_local *local = sdata->local; 1930 struct ieee80211_tx_data tx; 1931 ieee80211_tx_result res_prepare; 1932 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1933 bool result = true; 1934 1935 if (unlikely(skb->len < 10)) { 1936 dev_kfree_skb(skb); 1937 return true; 1938 } 1939 1940 /* initialises tx */ 1941 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1942 1943 if (unlikely(res_prepare == TX_DROP)) { 1944 ieee80211_free_txskb(&local->hw, skb); 1945 return true; 1946 } else if (unlikely(res_prepare == TX_QUEUED)) { 1947 return true; 1948 } 1949 1950 /* set up hw_queue value early */ 1951 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1952 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1953 info->hw_queue = 1954 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1955 1956 if (invoke_tx_handlers_early(&tx)) 1957 return true; 1958 1959 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1960 return true; 1961 1962 if (!invoke_tx_handlers_late(&tx)) 1963 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1964 1965 return result; 1966 } 1967 1968 /* device xmit handlers */ 1969 1970 enum ieee80211_encrypt { 1971 ENCRYPT_NO, 1972 ENCRYPT_MGMT, 1973 ENCRYPT_DATA, 1974 }; 1975 1976 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1977 struct sk_buff *skb, 1978 int head_need, 1979 enum ieee80211_encrypt encrypt) 1980 { 1981 struct ieee80211_local *local = sdata->local; 1982 bool enc_tailroom; 1983 int tail_need = 0; 1984 1985 enc_tailroom = encrypt == ENCRYPT_MGMT || 1986 (encrypt == ENCRYPT_DATA && 1987 sdata->crypto_tx_tailroom_needed_cnt); 1988 1989 if (enc_tailroom) { 1990 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1991 tail_need -= skb_tailroom(skb); 1992 tail_need = max_t(int, tail_need, 0); 1993 } 1994 1995 if (skb_cloned(skb) && 1996 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1997 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1998 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1999 else if (head_need || tail_need) 2000 I802_DEBUG_INC(local->tx_expand_skb_head); 2001 else 2002 return 0; 2003 2004 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2005 wiphy_debug(local->hw.wiphy, 2006 "failed to reallocate TX buffer\n"); 2007 return -ENOMEM; 2008 } 2009 2010 return 0; 2011 } 2012 2013 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2014 struct sta_info *sta, struct sk_buff *skb) 2015 { 2016 struct ieee80211_local *local = sdata->local; 2017 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2018 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2019 int headroom; 2020 enum ieee80211_encrypt encrypt; 2021 2022 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2023 encrypt = ENCRYPT_NO; 2024 else if (ieee80211_is_mgmt(hdr->frame_control)) 2025 encrypt = ENCRYPT_MGMT; 2026 else 2027 encrypt = ENCRYPT_DATA; 2028 2029 headroom = local->tx_headroom; 2030 if (encrypt != ENCRYPT_NO) 2031 headroom += IEEE80211_ENCRYPT_HEADROOM; 2032 headroom -= skb_headroom(skb); 2033 headroom = max_t(int, 0, headroom); 2034 2035 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2036 ieee80211_free_txskb(&local->hw, skb); 2037 return; 2038 } 2039 2040 /* reload after potential resize */ 2041 hdr = (struct ieee80211_hdr *) skb->data; 2042 info->control.vif = &sdata->vif; 2043 2044 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2045 if (ieee80211_is_data(hdr->frame_control) && 2046 is_unicast_ether_addr(hdr->addr1)) { 2047 if (mesh_nexthop_resolve(sdata, skb)) 2048 return; /* skb queued: don't free */ 2049 } else { 2050 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2051 } 2052 } 2053 2054 ieee80211_set_qos_hdr(sdata, skb); 2055 ieee80211_tx(sdata, sta, skb, false); 2056 } 2057 2058 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2059 { 2060 struct ieee80211_radiotap_header *rthdr = 2061 (struct ieee80211_radiotap_header *)skb->data; 2062 2063 /* check for not even having the fixed radiotap header part */ 2064 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2065 return false; /* too short to be possibly valid */ 2066 2067 /* is it a header version we can trust to find length from? */ 2068 if (unlikely(rthdr->it_version)) 2069 return false; /* only version 0 is supported */ 2070 2071 /* does the skb contain enough to deliver on the alleged length? */ 2072 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2073 return false; /* skb too short for claimed rt header extent */ 2074 2075 return true; 2076 } 2077 2078 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2079 struct net_device *dev) 2080 { 2081 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2082 struct ieee80211_radiotap_iterator iterator; 2083 struct ieee80211_radiotap_header *rthdr = 2084 (struct ieee80211_radiotap_header *) skb->data; 2085 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2086 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2087 NULL); 2088 u16 txflags; 2089 u16 rate = 0; 2090 bool rate_found = false; 2091 u8 rate_retries = 0; 2092 u16 rate_flags = 0; 2093 u8 mcs_known, mcs_flags, mcs_bw; 2094 u16 vht_known; 2095 u8 vht_mcs = 0, vht_nss = 0; 2096 int i; 2097 2098 if (!ieee80211_validate_radiotap_len(skb)) 2099 return false; 2100 2101 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2102 IEEE80211_TX_CTL_DONTFRAG; 2103 2104 /* 2105 * for every radiotap entry that is present 2106 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2107 * entries present, or -EINVAL on error) 2108 */ 2109 2110 while (!ret) { 2111 ret = ieee80211_radiotap_iterator_next(&iterator); 2112 2113 if (ret) 2114 continue; 2115 2116 /* see if this argument is something we can use */ 2117 switch (iterator.this_arg_index) { 2118 /* 2119 * You must take care when dereferencing iterator.this_arg 2120 * for multibyte types... the pointer is not aligned. Use 2121 * get_unaligned((type *)iterator.this_arg) to dereference 2122 * iterator.this_arg for type "type" safely on all arches. 2123 */ 2124 case IEEE80211_RADIOTAP_FLAGS: 2125 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2126 /* 2127 * this indicates that the skb we have been 2128 * handed has the 32-bit FCS CRC at the end... 2129 * we should react to that by snipping it off 2130 * because it will be recomputed and added 2131 * on transmission 2132 */ 2133 if (skb->len < (iterator._max_length + FCS_LEN)) 2134 return false; 2135 2136 skb_trim(skb, skb->len - FCS_LEN); 2137 } 2138 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2139 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2140 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2141 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2142 break; 2143 2144 case IEEE80211_RADIOTAP_TX_FLAGS: 2145 txflags = get_unaligned_le16(iterator.this_arg); 2146 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2147 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2148 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2149 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2150 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2151 info->control.flags |= 2152 IEEE80211_TX_CTRL_DONT_REORDER; 2153 break; 2154 2155 case IEEE80211_RADIOTAP_RATE: 2156 rate = *iterator.this_arg; 2157 rate_flags = 0; 2158 rate_found = true; 2159 break; 2160 2161 case IEEE80211_RADIOTAP_ANTENNA: 2162 /* this can appear multiple times, keep a bitmap */ 2163 info->control.antennas |= BIT(*iterator.this_arg); 2164 break; 2165 2166 case IEEE80211_RADIOTAP_DATA_RETRIES: 2167 rate_retries = *iterator.this_arg; 2168 break; 2169 2170 case IEEE80211_RADIOTAP_MCS: 2171 mcs_known = iterator.this_arg[0]; 2172 mcs_flags = iterator.this_arg[1]; 2173 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2174 break; 2175 2176 rate_found = true; 2177 rate = iterator.this_arg[2]; 2178 rate_flags = IEEE80211_TX_RC_MCS; 2179 2180 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2181 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2182 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2183 2184 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2185 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2186 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2187 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2188 2189 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2190 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2191 info->flags |= IEEE80211_TX_CTL_LDPC; 2192 2193 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2194 u8 stbc = u8_get_bits(mcs_flags, 2195 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2196 2197 info->flags |= 2198 u32_encode_bits(stbc, 2199 IEEE80211_TX_CTL_STBC); 2200 } 2201 break; 2202 2203 case IEEE80211_RADIOTAP_VHT: 2204 vht_known = get_unaligned_le16(iterator.this_arg); 2205 rate_found = true; 2206 2207 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2208 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2209 (iterator.this_arg[2] & 2210 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2211 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2212 if (vht_known & 2213 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2214 if (iterator.this_arg[3] == 1) 2215 rate_flags |= 2216 IEEE80211_TX_RC_40_MHZ_WIDTH; 2217 else if (iterator.this_arg[3] == 4) 2218 rate_flags |= 2219 IEEE80211_TX_RC_80_MHZ_WIDTH; 2220 else if (iterator.this_arg[3] == 11) 2221 rate_flags |= 2222 IEEE80211_TX_RC_160_MHZ_WIDTH; 2223 } 2224 2225 vht_mcs = iterator.this_arg[4] >> 4; 2226 if (vht_mcs > 11) 2227 vht_mcs = 0; 2228 vht_nss = iterator.this_arg[4] & 0xF; 2229 if (!vht_nss || vht_nss > 8) 2230 vht_nss = 1; 2231 break; 2232 2233 /* 2234 * Please update the file 2235 * Documentation/networking/mac80211-injection.rst 2236 * when parsing new fields here. 2237 */ 2238 2239 default: 2240 break; 2241 } 2242 } 2243 2244 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2245 return false; 2246 2247 if (rate_found) { 2248 struct ieee80211_supported_band *sband = 2249 local->hw.wiphy->bands[info->band]; 2250 2251 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2252 2253 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2254 info->control.rates[i].idx = -1; 2255 info->control.rates[i].flags = 0; 2256 info->control.rates[i].count = 0; 2257 } 2258 2259 if (rate_flags & IEEE80211_TX_RC_MCS) { 2260 /* reset antennas if not enough */ 2261 if (IEEE80211_HT_MCS_CHAINS(rate) > 2262 hweight8(info->control.antennas)) 2263 info->control.antennas = 0; 2264 2265 info->control.rates[0].idx = rate; 2266 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2267 /* reset antennas if not enough */ 2268 if (vht_nss > hweight8(info->control.antennas)) 2269 info->control.antennas = 0; 2270 2271 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2272 vht_nss); 2273 } else if (sband) { 2274 for (i = 0; i < sband->n_bitrates; i++) { 2275 if (rate * 5 != sband->bitrates[i].bitrate) 2276 continue; 2277 2278 info->control.rates[0].idx = i; 2279 break; 2280 } 2281 } 2282 2283 if (info->control.rates[0].idx < 0) 2284 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2285 2286 info->control.rates[0].flags = rate_flags; 2287 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2288 local->hw.max_rate_tries); 2289 } 2290 2291 return true; 2292 } 2293 2294 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2295 struct net_device *dev) 2296 { 2297 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2298 struct ieee80211_chanctx_conf *chanctx_conf; 2299 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2300 struct ieee80211_hdr *hdr; 2301 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2302 struct cfg80211_chan_def *chandef; 2303 u16 len_rthdr; 2304 int hdrlen; 2305 2306 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2307 if (unlikely(!ieee80211_sdata_running(sdata))) 2308 goto fail; 2309 2310 memset(info, 0, sizeof(*info)); 2311 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2312 IEEE80211_TX_CTL_INJECTED; 2313 2314 /* Sanity-check the length of the radiotap header */ 2315 if (!ieee80211_validate_radiotap_len(skb)) 2316 goto fail; 2317 2318 /* we now know there is a radiotap header with a length we can use */ 2319 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2320 2321 /* 2322 * fix up the pointers accounting for the radiotap 2323 * header still being in there. We are being given 2324 * a precooked IEEE80211 header so no need for 2325 * normal processing 2326 */ 2327 skb_set_mac_header(skb, len_rthdr); 2328 /* 2329 * these are just fixed to the end of the rt area since we 2330 * don't have any better information and at this point, nobody cares 2331 */ 2332 skb_set_network_header(skb, len_rthdr); 2333 skb_set_transport_header(skb, len_rthdr); 2334 2335 if (skb->len < len_rthdr + 2) 2336 goto fail; 2337 2338 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2339 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2340 2341 if (skb->len < len_rthdr + hdrlen) 2342 goto fail; 2343 2344 /* 2345 * Initialize skb->protocol if the injected frame is a data frame 2346 * carrying a rfc1042 header 2347 */ 2348 if (ieee80211_is_data(hdr->frame_control) && 2349 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2350 u8 *payload = (u8 *)hdr + hdrlen; 2351 2352 if (ether_addr_equal(payload, rfc1042_header)) 2353 skb->protocol = cpu_to_be16((payload[6] << 8) | 2354 payload[7]); 2355 } 2356 2357 rcu_read_lock(); 2358 2359 /* 2360 * We process outgoing injected frames that have a local address 2361 * we handle as though they are non-injected frames. 2362 * This code here isn't entirely correct, the local MAC address 2363 * isn't always enough to find the interface to use; for proper 2364 * VLAN support we have an nl80211-based mechanism. 2365 * 2366 * This is necessary, for example, for old hostapd versions that 2367 * don't use nl80211-based management TX/RX. 2368 */ 2369 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2370 if (!ieee80211_sdata_running(tmp_sdata)) 2371 continue; 2372 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2373 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2374 continue; 2375 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2376 sdata = tmp_sdata; 2377 break; 2378 } 2379 } 2380 2381 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2382 if (!chanctx_conf) { 2383 tmp_sdata = rcu_dereference(local->monitor_sdata); 2384 if (tmp_sdata) 2385 chanctx_conf = 2386 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2387 } 2388 2389 if (chanctx_conf) 2390 chandef = &chanctx_conf->def; 2391 else 2392 goto fail_rcu; 2393 2394 /* 2395 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2396 * shouldn't transmit on disabled channels. 2397 */ 2398 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2399 IEEE80211_CHAN_DISABLED)) 2400 goto fail_rcu; 2401 2402 /* 2403 * Frame injection is not allowed if beaconing is not allowed 2404 * or if we need radar detection. Beaconing is usually not allowed when 2405 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2406 * Passive scan is also used in world regulatory domains where 2407 * your country is not known and as such it should be treated as 2408 * NO TX unless the channel is explicitly allowed in which case 2409 * your current regulatory domain would not have the passive scan 2410 * flag. 2411 * 2412 * Since AP mode uses monitor interfaces to inject/TX management 2413 * frames we can make AP mode the exception to this rule once it 2414 * supports radar detection as its implementation can deal with 2415 * radar detection by itself. We can do that later by adding a 2416 * monitor flag interfaces used for AP support. 2417 */ 2418 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2419 sdata->vif.type)) 2420 goto fail_rcu; 2421 2422 info->band = chandef->chan->band; 2423 2424 /* Initialize skb->priority according to frame type and TID class, 2425 * with respect to the sub interface that the frame will actually 2426 * be transmitted on. If the DONT_REORDER flag is set, the original 2427 * skb-priority is preserved to assure frames injected with this 2428 * flag are not reordered relative to each other. 2429 */ 2430 ieee80211_select_queue_80211(sdata, skb, hdr); 2431 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2432 2433 /* 2434 * Process the radiotap header. This will now take into account the 2435 * selected chandef above to accurately set injection rates and 2436 * retransmissions. 2437 */ 2438 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2439 goto fail_rcu; 2440 2441 /* remove the injection radiotap header */ 2442 skb_pull(skb, len_rthdr); 2443 2444 ieee80211_xmit(sdata, NULL, skb); 2445 rcu_read_unlock(); 2446 2447 return NETDEV_TX_OK; 2448 2449 fail_rcu: 2450 rcu_read_unlock(); 2451 fail: 2452 dev_kfree_skb(skb); 2453 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2454 } 2455 2456 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2457 { 2458 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2459 2460 return ethertype == ETH_P_TDLS && 2461 skb->len > 14 && 2462 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2463 } 2464 2465 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2466 struct sk_buff *skb, 2467 struct sta_info **sta_out) 2468 { 2469 struct sta_info *sta; 2470 2471 switch (sdata->vif.type) { 2472 case NL80211_IFTYPE_AP_VLAN: 2473 sta = rcu_dereference(sdata->u.vlan.sta); 2474 if (sta) { 2475 *sta_out = sta; 2476 return 0; 2477 } else if (sdata->wdev.use_4addr) { 2478 return -ENOLINK; 2479 } 2480 fallthrough; 2481 case NL80211_IFTYPE_AP: 2482 case NL80211_IFTYPE_OCB: 2483 case NL80211_IFTYPE_ADHOC: 2484 if (is_multicast_ether_addr(skb->data)) { 2485 *sta_out = ERR_PTR(-ENOENT); 2486 return 0; 2487 } 2488 sta = sta_info_get_bss(sdata, skb->data); 2489 break; 2490 #ifdef CONFIG_MAC80211_MESH 2491 case NL80211_IFTYPE_MESH_POINT: 2492 /* determined much later */ 2493 *sta_out = NULL; 2494 return 0; 2495 #endif 2496 case NL80211_IFTYPE_STATION: 2497 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2498 sta = sta_info_get(sdata, skb->data); 2499 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2500 if (test_sta_flag(sta, 2501 WLAN_STA_TDLS_PEER_AUTH)) { 2502 *sta_out = sta; 2503 return 0; 2504 } 2505 2506 /* 2507 * TDLS link during setup - throw out frames to 2508 * peer. Allow TDLS-setup frames to unauthorized 2509 * peers for the special case of a link teardown 2510 * after a TDLS sta is removed due to being 2511 * unreachable. 2512 */ 2513 if (!ieee80211_is_tdls_setup(skb)) 2514 return -EINVAL; 2515 } 2516 2517 } 2518 2519 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2520 if (!sta) 2521 return -ENOLINK; 2522 break; 2523 default: 2524 return -EINVAL; 2525 } 2526 2527 *sta_out = sta ?: ERR_PTR(-ENOENT); 2528 return 0; 2529 } 2530 2531 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2532 struct sk_buff *skb, 2533 u32 *info_flags, 2534 u64 *cookie) 2535 { 2536 struct sk_buff *ack_skb; 2537 u16 info_id = 0; 2538 2539 if (skb->sk) 2540 ack_skb = skb_clone_sk(skb); 2541 else 2542 ack_skb = skb_clone(skb, GFP_ATOMIC); 2543 2544 if (ack_skb) { 2545 unsigned long flags; 2546 int id; 2547 2548 spin_lock_irqsave(&local->ack_status_lock, flags); 2549 id = idr_alloc(&local->ack_status_frames, ack_skb, 2550 1, 0x2000, GFP_ATOMIC); 2551 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2552 2553 if (id >= 0) { 2554 info_id = id; 2555 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2556 if (cookie) { 2557 *cookie = ieee80211_mgmt_tx_cookie(local); 2558 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2559 } 2560 } else { 2561 kfree_skb(ack_skb); 2562 } 2563 } 2564 2565 return info_id; 2566 } 2567 2568 /** 2569 * ieee80211_build_hdr - build 802.11 header in the given frame 2570 * @sdata: virtual interface to build the header for 2571 * @skb: the skb to build the header in 2572 * @info_flags: skb flags to set 2573 * @sta: the station pointer 2574 * @ctrl_flags: info control flags to set 2575 * @cookie: cookie pointer to fill (if not %NULL) 2576 * 2577 * This function takes the skb with 802.3 header and reformats the header to 2578 * the appropriate IEEE 802.11 header based on which interface the packet is 2579 * being transmitted on. 2580 * 2581 * Note that this function also takes care of the TX status request and 2582 * potential unsharing of the SKB - this needs to be interleaved with the 2583 * header building. 2584 * 2585 * The function requires the read-side RCU lock held 2586 * 2587 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2588 */ 2589 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2590 struct sk_buff *skb, u32 info_flags, 2591 struct sta_info *sta, u32 ctrl_flags, 2592 u64 *cookie) 2593 { 2594 struct ieee80211_local *local = sdata->local; 2595 struct ieee80211_tx_info *info; 2596 int head_need; 2597 u16 ethertype, hdrlen, meshhdrlen = 0; 2598 __le16 fc; 2599 struct ieee80211_hdr hdr; 2600 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2601 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2602 const u8 *encaps_data; 2603 int encaps_len, skip_header_bytes; 2604 bool wme_sta = false, authorized = false; 2605 bool tdls_peer; 2606 bool multicast; 2607 u16 info_id = 0; 2608 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2609 enum nl80211_band band; 2610 int ret; 2611 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2612 2613 if (IS_ERR(sta)) 2614 sta = NULL; 2615 2616 #ifdef CONFIG_MAC80211_DEBUGFS 2617 if (local->force_tx_status) 2618 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2619 #endif 2620 2621 /* convert Ethernet header to proper 802.11 header (based on 2622 * operation mode) */ 2623 ethertype = (skb->data[12] << 8) | skb->data[13]; 2624 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2625 2626 if (!ieee80211_vif_is_mld(&sdata->vif)) 2627 chanctx_conf = 2628 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2629 2630 switch (sdata->vif.type) { 2631 case NL80211_IFTYPE_AP_VLAN: 2632 if (sdata->wdev.use_4addr) { 2633 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2634 /* RA TA DA SA */ 2635 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2636 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2637 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2638 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2639 hdrlen = 30; 2640 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2641 wme_sta = sta->sta.wme; 2642 } 2643 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2644 struct ieee80211_sub_if_data *ap_sdata; 2645 2646 /* override chanctx_conf from AP (we don't have one) */ 2647 ap_sdata = container_of(sdata->bss, 2648 struct ieee80211_sub_if_data, 2649 u.ap); 2650 chanctx_conf = 2651 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2652 } 2653 if (sdata->wdev.use_4addr) 2654 break; 2655 fallthrough; 2656 case NL80211_IFTYPE_AP: 2657 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2658 /* DA BSSID SA */ 2659 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2660 2661 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2662 struct ieee80211_link_data *link; 2663 2664 link_id = sta->deflink.link_id; 2665 link = rcu_dereference(sdata->link[link_id]); 2666 if (WARN_ON(!link)) { 2667 ret = -ENOLINK; 2668 goto free; 2669 } 2670 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2671 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2672 (sta && sta->sta.mlo)) { 2673 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2674 } else { 2675 struct ieee80211_bss_conf *conf; 2676 2677 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2678 if (unlikely(!conf)) { 2679 ret = -ENOLINK; 2680 goto free; 2681 } 2682 2683 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2684 } 2685 2686 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2687 hdrlen = 24; 2688 break; 2689 #ifdef CONFIG_MAC80211_MESH 2690 case NL80211_IFTYPE_MESH_POINT: 2691 if (!is_multicast_ether_addr(skb->data)) { 2692 struct sta_info *next_hop; 2693 bool mpp_lookup = true; 2694 2695 mpath = mesh_path_lookup(sdata, skb->data); 2696 if (mpath) { 2697 mpp_lookup = false; 2698 next_hop = rcu_dereference(mpath->next_hop); 2699 if (!next_hop || 2700 !(mpath->flags & (MESH_PATH_ACTIVE | 2701 MESH_PATH_RESOLVING))) 2702 mpp_lookup = true; 2703 } 2704 2705 if (mpp_lookup) { 2706 mppath = mpp_path_lookup(sdata, skb->data); 2707 if (mppath) 2708 mppath->exp_time = jiffies; 2709 } 2710 2711 if (mppath && mpath) 2712 mesh_path_del(sdata, mpath->dst); 2713 } 2714 2715 /* 2716 * Use address extension if it is a packet from 2717 * another interface or if we know the destination 2718 * is being proxied by a portal (i.e. portal address 2719 * differs from proxied address) 2720 */ 2721 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2722 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2723 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2724 skb->data, skb->data + ETH_ALEN); 2725 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2726 NULL, NULL); 2727 } else { 2728 /* DS -> MBSS (802.11-2012 13.11.3.3). 2729 * For unicast with unknown forwarding information, 2730 * destination might be in the MBSS or if that fails 2731 * forwarded to another mesh gate. In either case 2732 * resolution will be handled in ieee80211_xmit(), so 2733 * leave the original DA. This also works for mcast */ 2734 const u8 *mesh_da = skb->data; 2735 2736 if (mppath) 2737 mesh_da = mppath->mpp; 2738 else if (mpath) 2739 mesh_da = mpath->dst; 2740 2741 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2742 mesh_da, sdata->vif.addr); 2743 if (is_multicast_ether_addr(mesh_da)) 2744 /* DA TA mSA AE:SA */ 2745 meshhdrlen = ieee80211_new_mesh_header( 2746 sdata, &mesh_hdr, 2747 skb->data + ETH_ALEN, NULL); 2748 else 2749 /* RA TA mDA mSA AE:DA SA */ 2750 meshhdrlen = ieee80211_new_mesh_header( 2751 sdata, &mesh_hdr, skb->data, 2752 skb->data + ETH_ALEN); 2753 2754 } 2755 2756 /* For injected frames, fill RA right away as nexthop lookup 2757 * will be skipped. 2758 */ 2759 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2760 is_zero_ether_addr(hdr.addr1)) 2761 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2762 break; 2763 #endif 2764 case NL80211_IFTYPE_STATION: 2765 /* we already did checks when looking up the RA STA */ 2766 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2767 2768 if (tdls_peer) { 2769 /* For TDLS only one link can be valid with peer STA */ 2770 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2771 struct ieee80211_link_data *link; 2772 2773 /* DA SA BSSID */ 2774 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2775 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2776 link = rcu_dereference(sdata->link[tdls_link_id]); 2777 if (WARN_ON_ONCE(!link)) { 2778 ret = -EINVAL; 2779 goto free; 2780 } 2781 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2782 hdrlen = 24; 2783 } else if (sdata->u.mgd.use_4addr && 2784 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2785 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2786 IEEE80211_FCTL_TODS); 2787 /* RA TA DA SA */ 2788 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2789 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2790 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2791 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2792 hdrlen = 30; 2793 } else { 2794 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2795 /* BSSID SA DA */ 2796 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2797 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2798 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2799 hdrlen = 24; 2800 } 2801 break; 2802 case NL80211_IFTYPE_OCB: 2803 /* DA SA BSSID */ 2804 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2805 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2806 eth_broadcast_addr(hdr.addr3); 2807 hdrlen = 24; 2808 break; 2809 case NL80211_IFTYPE_ADHOC: 2810 /* DA SA BSSID */ 2811 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2812 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2813 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2814 hdrlen = 24; 2815 break; 2816 default: 2817 ret = -EINVAL; 2818 goto free; 2819 } 2820 2821 if (!chanctx_conf) { 2822 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2823 ret = -ENOTCONN; 2824 goto free; 2825 } 2826 /* MLD transmissions must not rely on the band */ 2827 band = 0; 2828 } else { 2829 band = chanctx_conf->def.chan->band; 2830 } 2831 2832 multicast = is_multicast_ether_addr(hdr.addr1); 2833 2834 /* sta is always NULL for mesh */ 2835 if (sta) { 2836 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2837 wme_sta = sta->sta.wme; 2838 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2839 /* For mesh, the use of the QoS header is mandatory */ 2840 wme_sta = true; 2841 } 2842 2843 /* receiver does QoS (which also means we do) use it */ 2844 if (wme_sta) { 2845 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2846 hdrlen += 2; 2847 } 2848 2849 /* 2850 * Drop unicast frames to unauthorised stations unless they are 2851 * EAPOL frames from the local station. 2852 */ 2853 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2854 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2855 !multicast && !authorized && 2856 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2857 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2858 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2859 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2860 sdata->name, hdr.addr1); 2861 #endif 2862 2863 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2864 2865 ret = -EPERM; 2866 goto free; 2867 } 2868 2869 if (unlikely(!multicast && 2870 (sk_requests_wifi_status(skb->sk) || 2871 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2872 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2873 cookie); 2874 2875 /* 2876 * If the skb is shared we need to obtain our own copy. 2877 */ 2878 skb = skb_share_check(skb, GFP_ATOMIC); 2879 if (unlikely(!skb)) { 2880 ret = -ENOMEM; 2881 goto free; 2882 } 2883 2884 hdr.frame_control = fc; 2885 hdr.duration_id = 0; 2886 hdr.seq_ctrl = 0; 2887 2888 skip_header_bytes = ETH_HLEN; 2889 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2890 encaps_data = bridge_tunnel_header; 2891 encaps_len = sizeof(bridge_tunnel_header); 2892 skip_header_bytes -= 2; 2893 } else if (ethertype >= ETH_P_802_3_MIN) { 2894 encaps_data = rfc1042_header; 2895 encaps_len = sizeof(rfc1042_header); 2896 skip_header_bytes -= 2; 2897 } else { 2898 encaps_data = NULL; 2899 encaps_len = 0; 2900 } 2901 2902 skb_pull(skb, skip_header_bytes); 2903 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2904 2905 /* 2906 * So we need to modify the skb header and hence need a copy of 2907 * that. The head_need variable above doesn't, so far, include 2908 * the needed header space that we don't need right away. If we 2909 * can, then we don't reallocate right now but only after the 2910 * frame arrives at the master device (if it does...) 2911 * 2912 * If we cannot, however, then we will reallocate to include all 2913 * the ever needed space. Also, if we need to reallocate it anyway, 2914 * make it big enough for everything we may ever need. 2915 */ 2916 2917 if (head_need > 0 || skb_cloned(skb)) { 2918 head_need += IEEE80211_ENCRYPT_HEADROOM; 2919 head_need += local->tx_headroom; 2920 head_need = max_t(int, 0, head_need); 2921 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2922 ieee80211_free_txskb(&local->hw, skb); 2923 skb = NULL; 2924 return ERR_PTR(-ENOMEM); 2925 } 2926 } 2927 2928 if (encaps_data) 2929 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2930 2931 #ifdef CONFIG_MAC80211_MESH 2932 if (meshhdrlen > 0) 2933 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2934 #endif 2935 2936 if (ieee80211_is_data_qos(fc)) { 2937 __le16 *qos_control; 2938 2939 qos_control = skb_push(skb, 2); 2940 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2941 /* 2942 * Maybe we could actually set some fields here, for now just 2943 * initialise to zero to indicate no special operation. 2944 */ 2945 *qos_control = 0; 2946 } else 2947 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2948 2949 skb_reset_mac_header(skb); 2950 2951 info = IEEE80211_SKB_CB(skb); 2952 memset(info, 0, sizeof(*info)); 2953 2954 info->flags = info_flags; 2955 if (info_id) { 2956 info->status_data = info_id; 2957 info->status_data_idr = 1; 2958 } 2959 info->band = band; 2960 2961 if (likely(!cookie)) { 2962 ctrl_flags |= u32_encode_bits(link_id, 2963 IEEE80211_TX_CTRL_MLO_LINK); 2964 } else { 2965 unsigned int pre_conf_link_id; 2966 2967 /* 2968 * ctrl_flags already have been set by 2969 * ieee80211_tx_control_port(), here 2970 * we just sanity check that 2971 */ 2972 2973 pre_conf_link_id = u32_get_bits(ctrl_flags, 2974 IEEE80211_TX_CTRL_MLO_LINK); 2975 2976 if (pre_conf_link_id != link_id && 2977 link_id != IEEE80211_LINK_UNSPECIFIED) { 2978 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2979 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2980 sdata->name, hdr.addr1, 2981 pre_conf_link_id, link_id); 2982 #endif 2983 ret = -EINVAL; 2984 goto free; 2985 } 2986 } 2987 2988 info->control.flags = ctrl_flags; 2989 2990 return skb; 2991 free: 2992 kfree_skb(skb); 2993 return ERR_PTR(ret); 2994 } 2995 2996 /* 2997 * fast-xmit overview 2998 * 2999 * The core idea of this fast-xmit is to remove per-packet checks by checking 3000 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3001 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3002 * much less work can be done per packet. For example, fragmentation must be 3003 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3004 * in the code here. 3005 * 3006 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3007 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3008 * 3009 * The most difficult part of this is that when any of these assumptions 3010 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3011 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3012 * since the per-packet code no longer checks the conditions. This is reflected 3013 * by the calls to these functions throughout the rest of the code, and must be 3014 * maintained if any of the TX path checks change. 3015 */ 3016 3017 void ieee80211_check_fast_xmit(struct sta_info *sta) 3018 { 3019 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3020 struct ieee80211_local *local = sta->local; 3021 struct ieee80211_sub_if_data *sdata = sta->sdata; 3022 struct ieee80211_hdr *hdr = (void *)build.hdr; 3023 struct ieee80211_chanctx_conf *chanctx_conf; 3024 __le16 fc; 3025 3026 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3027 return; 3028 3029 if (ieee80211_vif_is_mesh(&sdata->vif)) 3030 mesh_fast_tx_flush_sta(sdata, sta); 3031 3032 /* Locking here protects both the pointer itself, and against concurrent 3033 * invocations winning data access races to, e.g., the key pointer that 3034 * is used. 3035 * Without it, the invocation of this function right after the key 3036 * pointer changes wouldn't be sufficient, as another CPU could access 3037 * the pointer, then stall, and then do the cache update after the CPU 3038 * that invalidated the key. 3039 * With the locking, such scenarios cannot happen as the check for the 3040 * key and the fast-tx assignment are done atomically, so the CPU that 3041 * modifies the key will either wait or other one will see the key 3042 * cleared/changed already. 3043 */ 3044 spin_lock_bh(&sta->lock); 3045 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3046 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3047 sdata->vif.type == NL80211_IFTYPE_STATION) 3048 goto out; 3049 3050 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3051 goto out; 3052 3053 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3054 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3055 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3056 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3057 goto out; 3058 3059 if (sdata->noack_map) 3060 goto out; 3061 3062 /* fast-xmit doesn't handle fragmentation at all */ 3063 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3064 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3065 goto out; 3066 3067 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3068 rcu_read_lock(); 3069 chanctx_conf = 3070 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3071 if (!chanctx_conf) { 3072 rcu_read_unlock(); 3073 goto out; 3074 } 3075 build.band = chanctx_conf->def.chan->band; 3076 rcu_read_unlock(); 3077 } else { 3078 /* MLD transmissions must not rely on the band */ 3079 build.band = 0; 3080 } 3081 3082 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3083 3084 switch (sdata->vif.type) { 3085 case NL80211_IFTYPE_ADHOC: 3086 /* DA SA BSSID */ 3087 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3088 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3089 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3090 build.hdr_len = 24; 3091 break; 3092 case NL80211_IFTYPE_STATION: 3093 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3094 /* For TDLS only one link can be valid with peer STA */ 3095 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3096 struct ieee80211_link_data *link; 3097 3098 /* DA SA BSSID */ 3099 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3100 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3101 rcu_read_lock(); 3102 link = rcu_dereference(sdata->link[tdls_link_id]); 3103 if (!WARN_ON_ONCE(!link)) 3104 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3105 rcu_read_unlock(); 3106 build.hdr_len = 24; 3107 break; 3108 } 3109 3110 if (sdata->u.mgd.use_4addr) { 3111 /* non-regular ethertype cannot use the fastpath */ 3112 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3113 IEEE80211_FCTL_TODS); 3114 /* RA TA DA SA */ 3115 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3116 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3117 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3118 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3119 build.hdr_len = 30; 3120 break; 3121 } 3122 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3123 /* BSSID SA DA */ 3124 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3125 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3126 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3127 build.hdr_len = 24; 3128 break; 3129 case NL80211_IFTYPE_AP_VLAN: 3130 if (sdata->wdev.use_4addr) { 3131 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3132 IEEE80211_FCTL_TODS); 3133 /* RA TA DA SA */ 3134 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3135 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3136 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3137 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3138 build.hdr_len = 30; 3139 break; 3140 } 3141 fallthrough; 3142 case NL80211_IFTYPE_AP: 3143 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3144 /* DA BSSID SA */ 3145 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3146 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3147 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3148 } else { 3149 unsigned int link_id = sta->deflink.link_id; 3150 struct ieee80211_link_data *link; 3151 3152 rcu_read_lock(); 3153 link = rcu_dereference(sdata->link[link_id]); 3154 if (WARN_ON(!link)) { 3155 rcu_read_unlock(); 3156 goto out; 3157 } 3158 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3159 rcu_read_unlock(); 3160 } 3161 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3162 build.hdr_len = 24; 3163 break; 3164 default: 3165 /* not handled on fast-xmit */ 3166 goto out; 3167 } 3168 3169 if (sta->sta.wme) { 3170 build.hdr_len += 2; 3171 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3172 } 3173 3174 /* We store the key here so there's no point in using rcu_dereference() 3175 * but that's fine because the code that changes the pointers will call 3176 * this function after doing so. For a single CPU that would be enough, 3177 * for multiple see the comment above. 3178 */ 3179 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3180 if (!build.key) 3181 build.key = rcu_access_pointer(sdata->default_unicast_key); 3182 if (build.key) { 3183 bool gen_iv, iv_spc, mmic; 3184 3185 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3186 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3187 mmic = build.key->conf.flags & 3188 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3189 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3190 3191 /* don't handle software crypto */ 3192 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3193 goto out; 3194 3195 /* Key is being removed */ 3196 if (build.key->flags & KEY_FLAG_TAINTED) 3197 goto out; 3198 3199 switch (build.key->conf.cipher) { 3200 case WLAN_CIPHER_SUITE_CCMP: 3201 case WLAN_CIPHER_SUITE_CCMP_256: 3202 if (gen_iv) 3203 build.pn_offs = build.hdr_len; 3204 if (gen_iv || iv_spc) 3205 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3206 break; 3207 case WLAN_CIPHER_SUITE_GCMP: 3208 case WLAN_CIPHER_SUITE_GCMP_256: 3209 if (gen_iv) 3210 build.pn_offs = build.hdr_len; 3211 if (gen_iv || iv_spc) 3212 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3213 break; 3214 case WLAN_CIPHER_SUITE_TKIP: 3215 /* cannot handle MMIC or IV generation in xmit-fast */ 3216 if (mmic || gen_iv) 3217 goto out; 3218 if (iv_spc) 3219 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3220 break; 3221 case WLAN_CIPHER_SUITE_WEP40: 3222 case WLAN_CIPHER_SUITE_WEP104: 3223 /* cannot handle IV generation in fast-xmit */ 3224 if (gen_iv) 3225 goto out; 3226 if (iv_spc) 3227 build.hdr_len += IEEE80211_WEP_IV_LEN; 3228 break; 3229 case WLAN_CIPHER_SUITE_AES_CMAC: 3230 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3231 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3232 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3233 WARN(1, 3234 "management cipher suite 0x%x enabled for data\n", 3235 build.key->conf.cipher); 3236 goto out; 3237 default: 3238 /* we don't know how to generate IVs for this at all */ 3239 if (WARN_ON(gen_iv)) 3240 goto out; 3241 } 3242 3243 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3244 } 3245 3246 hdr->frame_control = fc; 3247 3248 memcpy(build.hdr + build.hdr_len, 3249 rfc1042_header, sizeof(rfc1042_header)); 3250 build.hdr_len += sizeof(rfc1042_header); 3251 3252 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3253 /* if the kmemdup fails, continue w/o fast_tx */ 3254 3255 out: 3256 /* we might have raced against another call to this function */ 3257 old = rcu_dereference_protected(sta->fast_tx, 3258 lockdep_is_held(&sta->lock)); 3259 rcu_assign_pointer(sta->fast_tx, fast_tx); 3260 if (old) 3261 kfree_rcu(old, rcu_head); 3262 spin_unlock_bh(&sta->lock); 3263 } 3264 3265 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3266 { 3267 struct sta_info *sta; 3268 3269 rcu_read_lock(); 3270 list_for_each_entry_rcu(sta, &local->sta_list, list) 3271 ieee80211_check_fast_xmit(sta); 3272 rcu_read_unlock(); 3273 } 3274 3275 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3276 { 3277 struct ieee80211_local *local = sdata->local; 3278 struct sta_info *sta; 3279 3280 rcu_read_lock(); 3281 3282 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3283 if (sdata != sta->sdata && 3284 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3285 continue; 3286 ieee80211_check_fast_xmit(sta); 3287 } 3288 3289 rcu_read_unlock(); 3290 } 3291 3292 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3293 { 3294 struct ieee80211_fast_tx *fast_tx; 3295 3296 spin_lock_bh(&sta->lock); 3297 fast_tx = rcu_dereference_protected(sta->fast_tx, 3298 lockdep_is_held(&sta->lock)); 3299 RCU_INIT_POINTER(sta->fast_tx, NULL); 3300 spin_unlock_bh(&sta->lock); 3301 3302 if (fast_tx) 3303 kfree_rcu(fast_tx, rcu_head); 3304 } 3305 3306 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3307 struct sk_buff *skb, int headroom) 3308 { 3309 if (skb_headroom(skb) < headroom) { 3310 I802_DEBUG_INC(local->tx_expand_skb_head); 3311 3312 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3313 wiphy_debug(local->hw.wiphy, 3314 "failed to reallocate TX buffer\n"); 3315 return false; 3316 } 3317 } 3318 3319 return true; 3320 } 3321 3322 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3323 struct ieee80211_fast_tx *fast_tx, 3324 struct sk_buff *skb) 3325 { 3326 struct ieee80211_local *local = sdata->local; 3327 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3328 struct ieee80211_hdr *hdr; 3329 struct ethhdr *amsdu_hdr; 3330 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3331 int subframe_len = skb->len - hdr_len; 3332 void *data; 3333 u8 *qc, *h_80211_src, *h_80211_dst; 3334 const u8 *bssid; 3335 3336 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3337 return false; 3338 3339 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3340 return true; 3341 3342 if (!ieee80211_amsdu_realloc_pad(local, skb, 3343 sizeof(*amsdu_hdr) + 3344 local->hw.extra_tx_headroom)) 3345 return false; 3346 3347 data = skb_push(skb, sizeof(*amsdu_hdr)); 3348 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3349 hdr = data; 3350 amsdu_hdr = data + hdr_len; 3351 /* h_80211_src/dst is addr* field within hdr */ 3352 h_80211_src = data + fast_tx->sa_offs; 3353 h_80211_dst = data + fast_tx->da_offs; 3354 3355 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3356 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3357 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3358 3359 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3360 * fields needs to be changed to BSSID for A-MSDU frames depending 3361 * on FromDS/ToDS values. 3362 */ 3363 switch (sdata->vif.type) { 3364 case NL80211_IFTYPE_STATION: 3365 bssid = sdata->vif.cfg.ap_addr; 3366 break; 3367 case NL80211_IFTYPE_AP: 3368 case NL80211_IFTYPE_AP_VLAN: 3369 bssid = sdata->vif.addr; 3370 break; 3371 default: 3372 bssid = NULL; 3373 } 3374 3375 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3376 ether_addr_copy(h_80211_src, bssid); 3377 3378 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3379 ether_addr_copy(h_80211_dst, bssid); 3380 3381 qc = ieee80211_get_qos_ctl(hdr); 3382 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3383 3384 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3385 3386 return true; 3387 } 3388 3389 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3390 struct sta_info *sta, 3391 struct ieee80211_fast_tx *fast_tx, 3392 struct sk_buff *skb, 3393 const u8 *da, const u8 *sa) 3394 { 3395 struct ieee80211_local *local = sdata->local; 3396 struct fq *fq = &local->fq; 3397 struct fq_tin *tin; 3398 struct fq_flow *flow; 3399 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3400 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3401 struct txq_info *txqi; 3402 struct sk_buff **frag_tail, *head; 3403 int subframe_len = skb->len - ETH_ALEN; 3404 u8 max_subframes = sta->sta.max_amsdu_subframes; 3405 int max_frags = local->hw.max_tx_fragments; 3406 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3407 int orig_truesize; 3408 u32 flow_idx; 3409 __be16 len; 3410 void *data; 3411 bool ret = false; 3412 unsigned int orig_len; 3413 int n = 2, nfrags, pad = 0; 3414 u16 hdrlen; 3415 3416 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3417 return false; 3418 3419 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3420 return false; 3421 3422 if (ieee80211_vif_is_mesh(&sdata->vif)) 3423 return false; 3424 3425 if (skb_is_gso(skb)) 3426 return false; 3427 3428 if (!txq) 3429 return false; 3430 3431 txqi = to_txq_info(txq); 3432 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3433 return false; 3434 3435 if (sta->sta.cur->max_rc_amsdu_len) 3436 max_amsdu_len = min_t(int, max_amsdu_len, 3437 sta->sta.cur->max_rc_amsdu_len); 3438 3439 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3440 max_amsdu_len = min_t(int, max_amsdu_len, 3441 sta->sta.cur->max_tid_amsdu_len[tid]); 3442 3443 flow_idx = fq_flow_idx(fq, skb); 3444 3445 spin_lock_bh(&fq->lock); 3446 3447 /* TODO: Ideally aggregation should be done on dequeue to remain 3448 * responsive to environment changes. 3449 */ 3450 3451 tin = &txqi->tin; 3452 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3453 head = skb_peek_tail(&flow->queue); 3454 if (!head || skb_is_gso(head)) 3455 goto out; 3456 3457 orig_truesize = head->truesize; 3458 orig_len = head->len; 3459 3460 if (skb->len + head->len > max_amsdu_len) 3461 goto out; 3462 3463 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3464 nfrags += 1 + skb_shinfo(head)->nr_frags; 3465 frag_tail = &skb_shinfo(head)->frag_list; 3466 while (*frag_tail) { 3467 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3468 frag_tail = &(*frag_tail)->next; 3469 n++; 3470 } 3471 3472 if (max_subframes && n > max_subframes) 3473 goto out; 3474 3475 if (max_frags && nfrags > max_frags) 3476 goto out; 3477 3478 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3479 goto out; 3480 3481 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3482 goto out; 3483 3484 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3485 * and frag_tail should be &skb_shinfo(head)->frag_list. 3486 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3487 * Reload frag_tail to have it pointing to the correct place. 3488 */ 3489 if (n == 2) 3490 frag_tail = &skb_shinfo(head)->frag_list; 3491 3492 /* 3493 * Pad out the previous subframe to a multiple of 4 by adding the 3494 * padding to the next one, that's being added. Note that head->len 3495 * is the length of the full A-MSDU, but that works since each time 3496 * we add a new subframe we pad out the previous one to a multiple 3497 * of 4 and thus it no longer matters in the next round. 3498 */ 3499 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3500 if ((head->len - hdrlen) & 3) 3501 pad = 4 - ((head->len - hdrlen) & 3); 3502 3503 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3504 2 + pad)) 3505 goto out_recalc; 3506 3507 ret = true; 3508 data = skb_push(skb, ETH_ALEN + 2); 3509 ether_addr_copy(data, da); 3510 ether_addr_copy(data + ETH_ALEN, sa); 3511 3512 data += 2 * ETH_ALEN; 3513 len = cpu_to_be16(subframe_len); 3514 memcpy(data, &len, 2); 3515 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3516 3517 memset(skb_push(skb, pad), 0, pad); 3518 3519 head->len += skb->len; 3520 head->data_len += skb->len; 3521 *frag_tail = skb; 3522 3523 out_recalc: 3524 fq->memory_usage += head->truesize - orig_truesize; 3525 if (head->len != orig_len) { 3526 flow->backlog += head->len - orig_len; 3527 tin->backlog_bytes += head->len - orig_len; 3528 } 3529 out: 3530 spin_unlock_bh(&fq->lock); 3531 3532 return ret; 3533 } 3534 3535 /* 3536 * Can be called while the sta lock is held. Anything that can cause packets to 3537 * be generated will cause deadlock! 3538 */ 3539 static ieee80211_tx_result 3540 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3541 struct sta_info *sta, u8 pn_offs, 3542 struct ieee80211_key *key, 3543 struct ieee80211_tx_data *tx) 3544 { 3545 struct sk_buff *skb = tx->skb; 3546 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3547 struct ieee80211_hdr *hdr = (void *)skb->data; 3548 u8 tid = IEEE80211_NUM_TIDS; 3549 3550 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3551 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3552 return TX_DROP; 3553 3554 if (key) 3555 info->control.hw_key = &key->conf; 3556 3557 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3558 3559 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3560 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3561 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3562 } else { 3563 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3564 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3565 sdata->sequence_number += 0x10; 3566 } 3567 3568 if (skb_shinfo(skb)->gso_size) 3569 sta->deflink.tx_stats.msdu[tid] += 3570 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3571 else 3572 sta->deflink.tx_stats.msdu[tid]++; 3573 3574 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3575 3576 /* statistics normally done by ieee80211_tx_h_stats (but that 3577 * has to consider fragmentation, so is more complex) 3578 */ 3579 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3580 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3581 3582 if (pn_offs) { 3583 u64 pn; 3584 u8 *crypto_hdr = skb->data + pn_offs; 3585 3586 switch (key->conf.cipher) { 3587 case WLAN_CIPHER_SUITE_CCMP: 3588 case WLAN_CIPHER_SUITE_CCMP_256: 3589 case WLAN_CIPHER_SUITE_GCMP: 3590 case WLAN_CIPHER_SUITE_GCMP_256: 3591 pn = atomic64_inc_return(&key->conf.tx_pn); 3592 crypto_hdr[0] = pn; 3593 crypto_hdr[1] = pn >> 8; 3594 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3595 crypto_hdr[4] = pn >> 16; 3596 crypto_hdr[5] = pn >> 24; 3597 crypto_hdr[6] = pn >> 32; 3598 crypto_hdr[7] = pn >> 40; 3599 break; 3600 } 3601 } 3602 3603 return TX_CONTINUE; 3604 } 3605 3606 static netdev_features_t 3607 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3608 { 3609 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3610 return sdata->vif.netdev_features; 3611 3612 if (!sdata->bss) 3613 return 0; 3614 3615 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3616 return sdata->vif.netdev_features; 3617 } 3618 3619 static struct sk_buff * 3620 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3621 { 3622 if (skb_is_gso(skb)) { 3623 struct sk_buff *segs; 3624 3625 segs = skb_gso_segment(skb, features); 3626 if (!segs) 3627 return skb; 3628 if (IS_ERR(segs)) 3629 goto free; 3630 3631 consume_skb(skb); 3632 return segs; 3633 } 3634 3635 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3636 goto free; 3637 3638 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3639 int ofs = skb_checksum_start_offset(skb); 3640 3641 if (skb->encapsulation) 3642 skb_set_inner_transport_header(skb, ofs); 3643 else 3644 skb_set_transport_header(skb, ofs); 3645 3646 if (skb_csum_hwoffload_help(skb, features)) 3647 goto free; 3648 } 3649 3650 skb_mark_not_on_list(skb); 3651 return skb; 3652 3653 free: 3654 kfree_skb(skb); 3655 return NULL; 3656 } 3657 3658 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3659 struct sta_info *sta, 3660 struct ieee80211_fast_tx *fast_tx, 3661 struct sk_buff *skb, bool ampdu, 3662 const u8 *da, const u8 *sa) 3663 { 3664 struct ieee80211_local *local = sdata->local; 3665 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3666 struct ieee80211_tx_info *info; 3667 struct ieee80211_tx_data tx; 3668 ieee80211_tx_result r; 3669 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3670 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3671 3672 skb = skb_share_check(skb, GFP_ATOMIC); 3673 if (unlikely(!skb)) 3674 return; 3675 3676 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3677 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3678 return; 3679 3680 /* will not be crypto-handled beyond what we do here, so use false 3681 * as the may-encrypt argument for the resize to not account for 3682 * more room than we already have in 'extra_head' 3683 */ 3684 if (unlikely(ieee80211_skb_resize(sdata, skb, 3685 max_t(int, extra_head + hw_headroom - 3686 skb_headroom(skb), 0), 3687 ENCRYPT_NO))) 3688 goto free; 3689 3690 hdr = skb_push(skb, extra_head); 3691 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3692 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3693 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3694 3695 info = IEEE80211_SKB_CB(skb); 3696 memset(info, 0, sizeof(*info)); 3697 info->band = fast_tx->band; 3698 info->control.vif = &sdata->vif; 3699 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3700 IEEE80211_TX_CTL_DONTFRAG; 3701 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3702 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3703 IEEE80211_TX_CTRL_MLO_LINK); 3704 3705 #ifdef CONFIG_MAC80211_DEBUGFS 3706 if (local->force_tx_status) 3707 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3708 #endif 3709 3710 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3711 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3712 3713 *ieee80211_get_qos_ctl(hdr) = tid; 3714 } 3715 3716 __skb_queue_head_init(&tx.skbs); 3717 3718 tx.flags = IEEE80211_TX_UNICAST; 3719 tx.local = local; 3720 tx.sdata = sdata; 3721 tx.sta = sta; 3722 tx.key = fast_tx->key; 3723 3724 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3725 return; 3726 3727 tx.skb = skb; 3728 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3729 fast_tx->key, &tx); 3730 tx.skb = NULL; 3731 if (r == TX_DROP) 3732 goto free; 3733 3734 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3735 sdata = container_of(sdata->bss, 3736 struct ieee80211_sub_if_data, u.ap); 3737 3738 __skb_queue_tail(&tx.skbs, skb); 3739 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3740 return; 3741 3742 free: 3743 kfree_skb(skb); 3744 } 3745 3746 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3747 struct sta_info *sta, 3748 struct ieee80211_fast_tx *fast_tx, 3749 struct sk_buff *skb) 3750 { 3751 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3752 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3753 struct tid_ampdu_tx *tid_tx = NULL; 3754 struct sk_buff *next; 3755 struct ethhdr eth; 3756 u8 tid = IEEE80211_NUM_TIDS; 3757 3758 /* control port protocol needs a lot of special handling */ 3759 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3760 return false; 3761 3762 /* only RFC 1042 SNAP */ 3763 if (ethertype < ETH_P_802_3_MIN) 3764 return false; 3765 3766 /* don't handle TX status request here either */ 3767 if (sk_requests_wifi_status(skb->sk)) 3768 return false; 3769 3770 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3771 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3772 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3773 if (tid_tx) { 3774 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3775 return false; 3776 if (tid_tx->timeout) 3777 tid_tx->last_tx = jiffies; 3778 } 3779 } 3780 3781 memcpy(ð, skb->data, ETH_HLEN - 2); 3782 3783 /* after this point (skb is modified) we cannot return false */ 3784 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3785 if (!skb) 3786 return true; 3787 3788 skb_list_walk_safe(skb, skb, next) { 3789 skb_mark_not_on_list(skb); 3790 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3791 eth.h_dest, eth.h_source); 3792 } 3793 3794 return true; 3795 } 3796 3797 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3798 struct ieee80211_txq *txq) 3799 { 3800 struct ieee80211_local *local = hw_to_local(hw); 3801 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3802 struct ieee80211_hdr *hdr; 3803 struct sk_buff *skb = NULL; 3804 struct fq *fq = &local->fq; 3805 struct fq_tin *tin = &txqi->tin; 3806 struct ieee80211_tx_info *info; 3807 struct ieee80211_tx_data tx; 3808 ieee80211_tx_result r; 3809 struct ieee80211_vif *vif = txq->vif; 3810 int q = vif->hw_queue[txq->ac]; 3811 unsigned long flags; 3812 bool q_stopped; 3813 3814 WARN_ON_ONCE(softirq_count() == 0); 3815 3816 if (!ieee80211_txq_airtime_check(hw, txq)) 3817 return NULL; 3818 3819 begin: 3820 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3821 q_stopped = local->queue_stop_reasons[q]; 3822 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3823 3824 if (unlikely(q_stopped)) { 3825 /* mark for waking later */ 3826 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3827 return NULL; 3828 } 3829 3830 spin_lock_bh(&fq->lock); 3831 3832 /* Make sure fragments stay together. */ 3833 skb = __skb_dequeue(&txqi->frags); 3834 if (unlikely(skb)) { 3835 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3836 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3837 goto out; 3838 IEEE80211_SKB_CB(skb)->control.flags &= 3839 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3840 } else { 3841 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3842 goto out; 3843 3844 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3845 } 3846 3847 if (!skb) 3848 goto out; 3849 3850 spin_unlock_bh(&fq->lock); 3851 3852 hdr = (struct ieee80211_hdr *)skb->data; 3853 info = IEEE80211_SKB_CB(skb); 3854 3855 memset(&tx, 0, sizeof(tx)); 3856 __skb_queue_head_init(&tx.skbs); 3857 tx.local = local; 3858 tx.skb = skb; 3859 tx.sdata = vif_to_sdata(info->control.vif); 3860 3861 if (txq->sta) { 3862 tx.sta = container_of(txq->sta, struct sta_info, sta); 3863 /* 3864 * Drop unicast frames to unauthorised stations unless they are 3865 * injected frames or EAPOL frames from the local station. 3866 */ 3867 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3868 ieee80211_is_data(hdr->frame_control) && 3869 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3870 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3871 !is_multicast_ether_addr(hdr->addr1) && 3872 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3873 (!(info->control.flags & 3874 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3875 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3876 NULL)))) { 3877 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3878 ieee80211_free_txskb(&local->hw, skb); 3879 goto begin; 3880 } 3881 } 3882 3883 /* 3884 * The key can be removed while the packet was queued, so need to call 3885 * this here to get the current key. 3886 */ 3887 info->control.hw_key = NULL; 3888 r = ieee80211_tx_h_select_key(&tx); 3889 if (r != TX_CONTINUE) { 3890 ieee80211_free_txskb(&local->hw, skb); 3891 goto begin; 3892 } 3893 3894 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3895 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3896 IEEE80211_TX_CTL_DONTFRAG); 3897 3898 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3899 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3900 r = ieee80211_tx_h_rate_ctrl(&tx); 3901 if (r != TX_CONTINUE) { 3902 ieee80211_free_txskb(&local->hw, skb); 3903 goto begin; 3904 } 3905 } 3906 goto encap_out; 3907 } 3908 3909 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3910 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3911 sta); 3912 u8 pn_offs = 0; 3913 3914 if (tx.key && 3915 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3916 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3917 3918 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3919 tx.key, &tx); 3920 if (r != TX_CONTINUE) { 3921 ieee80211_free_txskb(&local->hw, skb); 3922 goto begin; 3923 } 3924 } else { 3925 if (invoke_tx_handlers_late(&tx)) 3926 goto begin; 3927 3928 skb = __skb_dequeue(&tx.skbs); 3929 info = IEEE80211_SKB_CB(skb); 3930 3931 if (!skb_queue_empty(&tx.skbs)) { 3932 spin_lock_bh(&fq->lock); 3933 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3934 spin_unlock_bh(&fq->lock); 3935 } 3936 } 3937 3938 if (skb_has_frag_list(skb) && 3939 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3940 if (skb_linearize(skb)) { 3941 ieee80211_free_txskb(&local->hw, skb); 3942 goto begin; 3943 } 3944 } 3945 3946 switch (tx.sdata->vif.type) { 3947 case NL80211_IFTYPE_MONITOR: 3948 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 3949 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 3950 vif = &tx.sdata->vif; 3951 break; 3952 } 3953 tx.sdata = rcu_dereference(local->monitor_sdata); 3954 if (tx.sdata && 3955 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 3956 vif = &tx.sdata->vif; 3957 info->hw_queue = 3958 vif->hw_queue[skb_get_queue_mapping(skb)]; 3959 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3960 ieee80211_free_txskb(&local->hw, skb); 3961 goto begin; 3962 } else { 3963 info->control.vif = NULL; 3964 return skb; 3965 } 3966 break; 3967 case NL80211_IFTYPE_AP_VLAN: 3968 tx.sdata = container_of(tx.sdata->bss, 3969 struct ieee80211_sub_if_data, u.ap); 3970 fallthrough; 3971 default: 3972 vif = &tx.sdata->vif; 3973 break; 3974 } 3975 3976 encap_out: 3977 info->control.vif = vif; 3978 3979 if (tx.sta && 3980 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3981 bool ampdu = txq->ac != IEEE80211_AC_VO; 3982 u32 airtime; 3983 3984 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3985 skb->len, ampdu); 3986 if (airtime) { 3987 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3988 ieee80211_sta_update_pending_airtime(local, tx.sta, 3989 txq->ac, 3990 airtime, 3991 false); 3992 } 3993 } 3994 3995 return skb; 3996 3997 out: 3998 spin_unlock_bh(&fq->lock); 3999 4000 return skb; 4001 } 4002 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4003 4004 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4005 { 4006 struct airtime_info *air_info = &sta->airtime[ac]; 4007 4008 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4009 } 4010 4011 static void 4012 ieee80211_txq_set_active(struct txq_info *txqi) 4013 { 4014 struct sta_info *sta; 4015 4016 if (!txqi->txq.sta) 4017 return; 4018 4019 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4020 sta->airtime[txqi->txq.ac].last_active = jiffies; 4021 } 4022 4023 static bool 4024 ieee80211_txq_keep_active(struct txq_info *txqi) 4025 { 4026 struct sta_info *sta; 4027 4028 if (!txqi->txq.sta) 4029 return false; 4030 4031 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4032 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4033 return false; 4034 4035 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4036 } 4037 4038 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4039 { 4040 struct ieee80211_local *local = hw_to_local(hw); 4041 struct ieee80211_txq *ret = NULL; 4042 struct txq_info *txqi = NULL, *head = NULL; 4043 bool found_eligible_txq = false; 4044 4045 spin_lock_bh(&local->active_txq_lock[ac]); 4046 4047 if (!local->schedule_round[ac]) 4048 goto out; 4049 4050 begin: 4051 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4052 struct txq_info, 4053 schedule_order); 4054 if (!txqi) 4055 goto out; 4056 4057 if (txqi == head) { 4058 if (!found_eligible_txq) 4059 goto out; 4060 else 4061 found_eligible_txq = false; 4062 } 4063 4064 if (!head) 4065 head = txqi; 4066 4067 if (txqi->txq.sta) { 4068 struct sta_info *sta = container_of(txqi->txq.sta, 4069 struct sta_info, sta); 4070 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4071 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4072 4073 if (aql_check) 4074 found_eligible_txq = true; 4075 4076 if (deficit < 0) 4077 sta->airtime[txqi->txq.ac].deficit += 4078 sta->airtime_weight; 4079 4080 if (deficit < 0 || !aql_check) { 4081 list_move_tail(&txqi->schedule_order, 4082 &local->active_txqs[txqi->txq.ac]); 4083 goto begin; 4084 } 4085 } 4086 4087 if (txqi->schedule_round == local->schedule_round[ac]) 4088 goto out; 4089 4090 list_del_init(&txqi->schedule_order); 4091 txqi->schedule_round = local->schedule_round[ac]; 4092 ret = &txqi->txq; 4093 4094 out: 4095 spin_unlock_bh(&local->active_txq_lock[ac]); 4096 return ret; 4097 } 4098 EXPORT_SYMBOL(ieee80211_next_txq); 4099 4100 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4101 struct ieee80211_txq *txq, 4102 bool force) 4103 { 4104 struct ieee80211_local *local = hw_to_local(hw); 4105 struct txq_info *txqi = to_txq_info(txq); 4106 bool has_queue; 4107 4108 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4109 4110 has_queue = force || 4111 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4112 txq_has_queue(txq)); 4113 if (list_empty(&txqi->schedule_order) && 4114 (has_queue || ieee80211_txq_keep_active(txqi))) { 4115 /* If airtime accounting is active, always enqueue STAs at the 4116 * head of the list to ensure that they only get moved to the 4117 * back by the airtime DRR scheduler once they have a negative 4118 * deficit. A station that already has a negative deficit will 4119 * get immediately moved to the back of the list on the next 4120 * call to ieee80211_next_txq(). 4121 */ 4122 if (txqi->txq.sta && local->airtime_flags && has_queue && 4123 wiphy_ext_feature_isset(local->hw.wiphy, 4124 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4125 list_add(&txqi->schedule_order, 4126 &local->active_txqs[txq->ac]); 4127 else 4128 list_add_tail(&txqi->schedule_order, 4129 &local->active_txqs[txq->ac]); 4130 if (has_queue) 4131 ieee80211_txq_set_active(txqi); 4132 } 4133 4134 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4135 } 4136 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4137 4138 DEFINE_STATIC_KEY_FALSE(aql_disable); 4139 4140 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4141 struct ieee80211_txq *txq) 4142 { 4143 struct sta_info *sta; 4144 struct ieee80211_local *local = hw_to_local(hw); 4145 4146 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4147 return true; 4148 4149 if (static_branch_unlikely(&aql_disable)) 4150 return true; 4151 4152 if (!txq->sta) 4153 return true; 4154 4155 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4156 return true; 4157 4158 sta = container_of(txq->sta, struct sta_info, sta); 4159 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4160 sta->airtime[txq->ac].aql_limit_low) 4161 return true; 4162 4163 if (atomic_read(&local->aql_total_pending_airtime) < 4164 local->aql_threshold && 4165 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4166 sta->airtime[txq->ac].aql_limit_high) 4167 return true; 4168 4169 return false; 4170 } 4171 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4172 4173 static bool 4174 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4175 { 4176 unsigned int num_txq = 0; 4177 struct txq_info *txq; 4178 u32 aql_limit; 4179 4180 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4181 return true; 4182 4183 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4184 num_txq++; 4185 4186 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4187 local->aql_txq_limit_high[ac]; 4188 4189 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4190 } 4191 4192 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4193 struct ieee80211_txq *txq) 4194 { 4195 struct ieee80211_local *local = hw_to_local(hw); 4196 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4197 struct sta_info *sta; 4198 u8 ac = txq->ac; 4199 4200 spin_lock_bh(&local->active_txq_lock[ac]); 4201 4202 if (!txqi->txq.sta) 4203 goto out; 4204 4205 if (list_empty(&txqi->schedule_order)) 4206 goto out; 4207 4208 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4209 goto out; 4210 4211 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4212 schedule_order) { 4213 if (iter == txqi) 4214 break; 4215 4216 if (!iter->txq.sta) { 4217 list_move_tail(&iter->schedule_order, 4218 &local->active_txqs[ac]); 4219 continue; 4220 } 4221 sta = container_of(iter->txq.sta, struct sta_info, sta); 4222 if (ieee80211_sta_deficit(sta, ac) < 0) 4223 sta->airtime[ac].deficit += sta->airtime_weight; 4224 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4225 } 4226 4227 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4228 if (sta->airtime[ac].deficit >= 0) 4229 goto out; 4230 4231 sta->airtime[ac].deficit += sta->airtime_weight; 4232 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4233 spin_unlock_bh(&local->active_txq_lock[ac]); 4234 4235 return false; 4236 out: 4237 if (!list_empty(&txqi->schedule_order)) 4238 list_del_init(&txqi->schedule_order); 4239 spin_unlock_bh(&local->active_txq_lock[ac]); 4240 4241 return true; 4242 } 4243 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4244 4245 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4246 { 4247 struct ieee80211_local *local = hw_to_local(hw); 4248 4249 spin_lock_bh(&local->active_txq_lock[ac]); 4250 4251 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4252 local->schedule_round[ac]++; 4253 if (!local->schedule_round[ac]) 4254 local->schedule_round[ac]++; 4255 } else { 4256 local->schedule_round[ac] = 0; 4257 } 4258 4259 spin_unlock_bh(&local->active_txq_lock[ac]); 4260 } 4261 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4262 4263 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4264 struct net_device *dev, 4265 u32 info_flags, 4266 u32 ctrl_flags, 4267 u64 *cookie) 4268 { 4269 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4270 struct ieee80211_local *local = sdata->local; 4271 struct sta_info *sta; 4272 struct sk_buff *next; 4273 int len = skb->len; 4274 4275 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4276 kfree_skb(skb); 4277 return; 4278 } 4279 4280 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4281 4282 rcu_read_lock(); 4283 4284 if (ieee80211_vif_is_mesh(&sdata->vif) && 4285 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4286 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4287 goto out; 4288 4289 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4290 goto out_free; 4291 4292 if (IS_ERR(sta)) 4293 sta = NULL; 4294 4295 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4296 ieee80211_aggr_check(sdata, sta, skb); 4297 4298 if (sta) { 4299 struct ieee80211_fast_tx *fast_tx; 4300 4301 fast_tx = rcu_dereference(sta->fast_tx); 4302 4303 if (fast_tx && 4304 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4305 goto out; 4306 } 4307 4308 /* the frame could be fragmented, software-encrypted, and other 4309 * things so we cannot really handle checksum or GSO offload. 4310 * fix it up in software before we handle anything else. 4311 */ 4312 skb = ieee80211_tx_skb_fixup(skb, 0); 4313 if (!skb) { 4314 len = 0; 4315 goto out; 4316 } 4317 4318 skb_list_walk_safe(skb, skb, next) { 4319 skb_mark_not_on_list(skb); 4320 4321 if (skb->protocol == sdata->control_port_protocol) 4322 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4323 4324 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4325 sta, ctrl_flags, cookie); 4326 if (IS_ERR(skb)) { 4327 kfree_skb_list(next); 4328 goto out; 4329 } 4330 4331 dev_sw_netstats_tx_add(dev, 1, skb->len); 4332 4333 ieee80211_xmit(sdata, sta, skb); 4334 } 4335 goto out; 4336 out_free: 4337 kfree_skb(skb); 4338 len = 0; 4339 out: 4340 if (len) 4341 ieee80211_tpt_led_trig_tx(local, len); 4342 rcu_read_unlock(); 4343 } 4344 4345 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4346 { 4347 struct ethhdr *eth; 4348 int err; 4349 4350 err = skb_ensure_writable(skb, ETH_HLEN); 4351 if (unlikely(err)) 4352 return err; 4353 4354 eth = (void *)skb->data; 4355 ether_addr_copy(eth->h_dest, sta->sta.addr); 4356 4357 return 0; 4358 } 4359 4360 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4361 struct net_device *dev) 4362 { 4363 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4364 const struct ethhdr *eth = (void *)skb->data; 4365 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4366 __be16 ethertype; 4367 4368 switch (sdata->vif.type) { 4369 case NL80211_IFTYPE_AP_VLAN: 4370 if (sdata->u.vlan.sta) 4371 return false; 4372 if (sdata->wdev.use_4addr) 4373 return false; 4374 fallthrough; 4375 case NL80211_IFTYPE_AP: 4376 /* check runtime toggle for this bss */ 4377 if (!sdata->bss->multicast_to_unicast) 4378 return false; 4379 break; 4380 default: 4381 return false; 4382 } 4383 4384 /* multicast to unicast conversion only for some payload */ 4385 ethertype = eth->h_proto; 4386 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4387 ethertype = ethvlan->h_vlan_encapsulated_proto; 4388 switch (ethertype) { 4389 case htons(ETH_P_ARP): 4390 case htons(ETH_P_IP): 4391 case htons(ETH_P_IPV6): 4392 break; 4393 default: 4394 return false; 4395 } 4396 4397 return true; 4398 } 4399 4400 static void 4401 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4402 struct sk_buff_head *queue) 4403 { 4404 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4405 struct ieee80211_local *local = sdata->local; 4406 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4407 struct sta_info *sta, *first = NULL; 4408 struct sk_buff *cloned_skb; 4409 4410 rcu_read_lock(); 4411 4412 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4413 if (sdata != sta->sdata) 4414 /* AP-VLAN mismatch */ 4415 continue; 4416 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4417 /* do not send back to source */ 4418 continue; 4419 if (!first) { 4420 first = sta; 4421 continue; 4422 } 4423 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4424 if (!cloned_skb) 4425 goto multicast; 4426 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4427 dev_kfree_skb(cloned_skb); 4428 goto multicast; 4429 } 4430 __skb_queue_tail(queue, cloned_skb); 4431 } 4432 4433 if (likely(first)) { 4434 if (unlikely(ieee80211_change_da(skb, first))) 4435 goto multicast; 4436 __skb_queue_tail(queue, skb); 4437 } else { 4438 /* no STA connected, drop */ 4439 kfree_skb(skb); 4440 skb = NULL; 4441 } 4442 4443 goto out; 4444 multicast: 4445 __skb_queue_purge(queue); 4446 __skb_queue_tail(queue, skb); 4447 out: 4448 rcu_read_unlock(); 4449 } 4450 4451 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4452 struct sk_buff *skb, u32 ctrl_flags, 4453 unsigned int link_id) 4454 { 4455 struct sk_buff *out; 4456 4457 out = skb_copy(skb, GFP_ATOMIC); 4458 if (!out) 4459 return; 4460 4461 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4462 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4463 } 4464 4465 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4466 struct sk_buff *skb) 4467 { 4468 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4469 unsigned long links = sdata->vif.active_links; 4470 unsigned int link; 4471 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4472 4473 if (hweight16(links) == 1) { 4474 ctrl_flags |= u32_encode_bits(__ffs(links), 4475 IEEE80211_TX_CTRL_MLO_LINK); 4476 4477 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4478 NULL); 4479 return; 4480 } 4481 4482 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4483 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4484 ctrl_flags = 0; 4485 } 4486 kfree_skb(skb); 4487 } 4488 4489 /** 4490 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4491 * @skb: packet to be sent 4492 * @dev: incoming interface 4493 * 4494 * On failure skb will be freed. 4495 * 4496 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4497 */ 4498 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4499 struct net_device *dev) 4500 { 4501 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4502 const struct ethhdr *eth = (void *)skb->data; 4503 4504 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4505 goto normal; 4506 4507 if (unlikely(!ieee80211_sdata_running(sdata))) { 4508 kfree_skb(skb); 4509 return NETDEV_TX_OK; 4510 } 4511 4512 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4513 struct sk_buff_head queue; 4514 4515 __skb_queue_head_init(&queue); 4516 ieee80211_convert_to_unicast(skb, dev, &queue); 4517 while ((skb = __skb_dequeue(&queue))) 4518 __ieee80211_subif_start_xmit(skb, dev, 0, 4519 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4520 NULL); 4521 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4522 ((sdata->vif.type == NL80211_IFTYPE_AP && 4523 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4524 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4525 !sdata->wdev.use_4addr))) { 4526 ieee80211_mlo_multicast_tx(dev, skb); 4527 } else { 4528 normal: 4529 __ieee80211_subif_start_xmit(skb, dev, 0, 4530 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4531 NULL); 4532 } 4533 4534 return NETDEV_TX_OK; 4535 } 4536 4537 4538 4539 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4540 struct sk_buff *skb, struct sta_info *sta, 4541 bool txpending) 4542 { 4543 struct ieee80211_local *local = sdata->local; 4544 struct ieee80211_tx_control control = {}; 4545 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4546 struct ieee80211_sta *pubsta = NULL; 4547 unsigned long flags; 4548 int q = info->hw_queue; 4549 4550 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4551 4552 if (local->queue_stop_reasons[q] || 4553 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4554 if (txpending) 4555 skb_queue_head(&local->pending[q], skb); 4556 else 4557 skb_queue_tail(&local->pending[q], skb); 4558 4559 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4560 4561 return false; 4562 } 4563 4564 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4565 4566 if (sta && sta->uploaded) 4567 pubsta = &sta->sta; 4568 4569 control.sta = pubsta; 4570 4571 drv_tx(local, &control, skb); 4572 4573 return true; 4574 } 4575 4576 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4577 struct sk_buff *skb, struct sta_info *sta, 4578 bool txpending) 4579 { 4580 struct ieee80211_local *local = sdata->local; 4581 struct sk_buff *next; 4582 bool ret = true; 4583 4584 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4585 return true; 4586 4587 skb_list_walk_safe(skb, skb, next) { 4588 skb_mark_not_on_list(skb); 4589 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4590 ret = false; 4591 } 4592 4593 return ret; 4594 } 4595 4596 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4597 struct net_device *dev, struct sta_info *sta, 4598 struct ieee80211_key *key, struct sk_buff *skb) 4599 { 4600 struct ieee80211_tx_info *info; 4601 struct ieee80211_local *local = sdata->local; 4602 struct tid_ampdu_tx *tid_tx; 4603 struct sk_buff *seg, *next; 4604 unsigned int skbs = 0, len = 0; 4605 u16 queue; 4606 u8 tid; 4607 4608 queue = ieee80211_select_queue(sdata, sta, skb); 4609 skb_set_queue_mapping(skb, queue); 4610 4611 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4612 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4613 goto out_free; 4614 4615 skb = skb_share_check(skb, GFP_ATOMIC); 4616 if (unlikely(!skb)) 4617 return; 4618 4619 ieee80211_aggr_check(sdata, sta, skb); 4620 4621 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4622 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4623 if (tid_tx) { 4624 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4625 /* fall back to non-offload slow path */ 4626 __ieee80211_subif_start_xmit(skb, dev, 0, 4627 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4628 NULL); 4629 return; 4630 } 4631 4632 if (tid_tx->timeout) 4633 tid_tx->last_tx = jiffies; 4634 } 4635 4636 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4637 if (!skb) 4638 return; 4639 4640 info = IEEE80211_SKB_CB(skb); 4641 memset(info, 0, sizeof(*info)); 4642 4643 info->hw_queue = sdata->vif.hw_queue[queue]; 4644 4645 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4646 sdata = container_of(sdata->bss, 4647 struct ieee80211_sub_if_data, u.ap); 4648 4649 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4650 info->control.vif = &sdata->vif; 4651 4652 if (key) 4653 info->control.hw_key = &key->conf; 4654 4655 skb_list_walk_safe(skb, seg, next) { 4656 skbs++; 4657 len += seg->len; 4658 if (seg != skb) 4659 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4660 } 4661 4662 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4663 info->status_data = ieee80211_store_ack_skb(local, skb, 4664 &info->flags, NULL); 4665 if (info->status_data) 4666 info->status_data_idr = 1; 4667 } 4668 4669 dev_sw_netstats_tx_add(dev, skbs, len); 4670 sta->deflink.tx_stats.packets[queue] += skbs; 4671 sta->deflink.tx_stats.bytes[queue] += len; 4672 4673 ieee80211_tpt_led_trig_tx(local, len); 4674 4675 ieee80211_tx_8023(sdata, skb, sta, false); 4676 4677 return; 4678 4679 out_free: 4680 kfree_skb(skb); 4681 } 4682 4683 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4684 struct net_device *dev) 4685 { 4686 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4687 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4688 struct ieee80211_key *key; 4689 struct sta_info *sta; 4690 4691 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4692 kfree_skb(skb); 4693 return NETDEV_TX_OK; 4694 } 4695 4696 rcu_read_lock(); 4697 4698 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4699 kfree_skb(skb); 4700 goto out; 4701 } 4702 4703 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4704 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4705 sdata->control_port_protocol == ehdr->h_proto)) 4706 goto skip_offload; 4707 4708 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4709 if (!key) 4710 key = rcu_dereference(sdata->default_unicast_key); 4711 4712 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4713 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4714 goto skip_offload; 4715 4716 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4717 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4718 goto out; 4719 4720 skip_offload: 4721 ieee80211_subif_start_xmit(skb, dev); 4722 out: 4723 rcu_read_unlock(); 4724 4725 return NETDEV_TX_OK; 4726 } 4727 4728 struct sk_buff * 4729 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4730 struct sk_buff *skb, u32 info_flags) 4731 { 4732 struct ieee80211_hdr *hdr; 4733 struct ieee80211_tx_data tx = { 4734 .local = sdata->local, 4735 .sdata = sdata, 4736 }; 4737 struct sta_info *sta; 4738 4739 rcu_read_lock(); 4740 4741 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4742 kfree_skb(skb); 4743 skb = ERR_PTR(-EINVAL); 4744 goto out; 4745 } 4746 4747 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4748 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4749 if (IS_ERR(skb)) 4750 goto out; 4751 4752 hdr = (void *)skb->data; 4753 tx.sta = sta_info_get(sdata, hdr->addr1); 4754 tx.skb = skb; 4755 4756 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4757 rcu_read_unlock(); 4758 kfree_skb(skb); 4759 return ERR_PTR(-EINVAL); 4760 } 4761 4762 out: 4763 rcu_read_unlock(); 4764 return skb; 4765 } 4766 4767 /* 4768 * ieee80211_clear_tx_pending may not be called in a context where 4769 * it is possible that it packets could come in again. 4770 */ 4771 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4772 { 4773 struct sk_buff *skb; 4774 int i; 4775 4776 for (i = 0; i < local->hw.queues; i++) { 4777 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4778 ieee80211_free_txskb(&local->hw, skb); 4779 } 4780 } 4781 4782 /* 4783 * Returns false if the frame couldn't be transmitted but was queued instead, 4784 * which in this case means re-queued -- take as an indication to stop sending 4785 * more pending frames. 4786 */ 4787 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4788 struct sk_buff *skb) 4789 { 4790 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4791 struct ieee80211_sub_if_data *sdata; 4792 struct sta_info *sta; 4793 struct ieee80211_hdr *hdr; 4794 bool result; 4795 struct ieee80211_chanctx_conf *chanctx_conf; 4796 4797 sdata = vif_to_sdata(info->control.vif); 4798 4799 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4800 /* update band only for non-MLD */ 4801 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4802 chanctx_conf = 4803 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4804 if (unlikely(!chanctx_conf)) { 4805 dev_kfree_skb(skb); 4806 return true; 4807 } 4808 info->band = chanctx_conf->def.chan->band; 4809 } 4810 result = ieee80211_tx(sdata, NULL, skb, true); 4811 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4812 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4813 dev_kfree_skb(skb); 4814 return true; 4815 } 4816 4817 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4818 sta = NULL; 4819 4820 result = ieee80211_tx_8023(sdata, skb, sta, true); 4821 } else { 4822 struct sk_buff_head skbs; 4823 4824 __skb_queue_head_init(&skbs); 4825 __skb_queue_tail(&skbs, skb); 4826 4827 hdr = (struct ieee80211_hdr *)skb->data; 4828 sta = sta_info_get(sdata, hdr->addr1); 4829 4830 result = __ieee80211_tx(local, &skbs, sta, true); 4831 } 4832 4833 return result; 4834 } 4835 4836 /* 4837 * Transmit all pending packets. Called from tasklet. 4838 */ 4839 void ieee80211_tx_pending(struct tasklet_struct *t) 4840 { 4841 struct ieee80211_local *local = from_tasklet(local, t, 4842 tx_pending_tasklet); 4843 unsigned long flags; 4844 int i; 4845 bool txok; 4846 4847 rcu_read_lock(); 4848 4849 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4850 for (i = 0; i < local->hw.queues; i++) { 4851 /* 4852 * If queue is stopped by something other than due to pending 4853 * frames, or we have no pending frames, proceed to next queue. 4854 */ 4855 if (local->queue_stop_reasons[i] || 4856 skb_queue_empty(&local->pending[i])) 4857 continue; 4858 4859 while (!skb_queue_empty(&local->pending[i])) { 4860 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4861 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4862 4863 if (WARN_ON(!info->control.vif)) { 4864 ieee80211_free_txskb(&local->hw, skb); 4865 continue; 4866 } 4867 4868 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4869 flags); 4870 4871 txok = ieee80211_tx_pending_skb(local, skb); 4872 spin_lock_irqsave(&local->queue_stop_reason_lock, 4873 flags); 4874 if (!txok) 4875 break; 4876 } 4877 } 4878 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4879 4880 rcu_read_unlock(); 4881 } 4882 4883 /* functions for drivers to get certain frames */ 4884 4885 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4886 struct ieee80211_link_data *link, 4887 struct ps_data *ps, struct sk_buff *skb, 4888 bool is_template) 4889 { 4890 u8 *pos, *tim; 4891 int aid0 = 0; 4892 int i, have_bits = 0, n1, n2; 4893 struct ieee80211_bss_conf *link_conf = link->conf; 4894 4895 /* Generate bitmap for TIM only if there are any STAs in power save 4896 * mode. */ 4897 if (atomic_read(&ps->num_sta_ps) > 0) 4898 /* in the hope that this is faster than 4899 * checking byte-for-byte */ 4900 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4901 IEEE80211_MAX_AID+1); 4902 if (!is_template) { 4903 if (ps->dtim_count == 0) 4904 ps->dtim_count = link_conf->dtim_period - 1; 4905 else 4906 ps->dtim_count--; 4907 } 4908 4909 tim = pos = skb_put(skb, 5); 4910 *pos++ = WLAN_EID_TIM; 4911 *pos++ = 3; 4912 *pos++ = ps->dtim_count; 4913 *pos++ = link_conf->dtim_period; 4914 4915 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4916 aid0 = 1; 4917 4918 ps->dtim_bc_mc = aid0 == 1; 4919 4920 if (have_bits) { 4921 /* Find largest even number N1 so that bits numbered 1 through 4922 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4923 * (N2 + 1) x 8 through 2007 are 0. */ 4924 n1 = 0; 4925 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4926 if (ps->tim[i]) { 4927 n1 = i & 0xfe; 4928 break; 4929 } 4930 } 4931 n2 = n1; 4932 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4933 if (ps->tim[i]) { 4934 n2 = i; 4935 break; 4936 } 4937 } 4938 4939 /* Bitmap control */ 4940 *pos++ = n1 | aid0; 4941 /* Part Virt Bitmap */ 4942 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4943 4944 tim[1] = n2 - n1 + 4; 4945 } else { 4946 *pos++ = aid0; /* Bitmap control */ 4947 4948 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4949 tim[1] = 4; 4950 /* Part Virt Bitmap */ 4951 skb_put_u8(skb, 0); 4952 } 4953 } 4954 } 4955 4956 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4957 struct ieee80211_link_data *link, 4958 struct ps_data *ps, struct sk_buff *skb, 4959 bool is_template) 4960 { 4961 struct ieee80211_local *local = sdata->local; 4962 4963 /* 4964 * Not very nice, but we want to allow the driver to call 4965 * ieee80211_beacon_get() as a response to the set_tim() 4966 * callback. That, however, is already invoked under the 4967 * sta_lock to guarantee consistent and race-free update 4968 * of the tim bitmap in mac80211 and the driver. 4969 */ 4970 if (local->tim_in_locked_section) { 4971 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4972 } else { 4973 spin_lock_bh(&local->tim_lock); 4974 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4975 spin_unlock_bh(&local->tim_lock); 4976 } 4977 4978 return 0; 4979 } 4980 4981 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4982 struct beacon_data *beacon, 4983 struct ieee80211_link_data *link) 4984 { 4985 u8 *beacon_data, count, max_count = 1; 4986 struct probe_resp *resp; 4987 size_t beacon_data_len; 4988 u16 *bcn_offsets; 4989 int i; 4990 4991 switch (sdata->vif.type) { 4992 case NL80211_IFTYPE_AP: 4993 beacon_data = beacon->tail; 4994 beacon_data_len = beacon->tail_len; 4995 break; 4996 case NL80211_IFTYPE_ADHOC: 4997 beacon_data = beacon->head; 4998 beacon_data_len = beacon->head_len; 4999 break; 5000 case NL80211_IFTYPE_MESH_POINT: 5001 beacon_data = beacon->head; 5002 beacon_data_len = beacon->head_len; 5003 break; 5004 default: 5005 return; 5006 } 5007 5008 resp = rcu_dereference(link->u.ap.probe_resp); 5009 5010 bcn_offsets = beacon->cntdwn_counter_offsets; 5011 count = beacon->cntdwn_current_counter; 5012 if (link->conf->csa_active) 5013 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5014 5015 for (i = 0; i < max_count; ++i) { 5016 if (bcn_offsets[i]) { 5017 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5018 return; 5019 beacon_data[bcn_offsets[i]] = count; 5020 } 5021 5022 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5023 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5024 5025 resp->data[resp_offsets[i]] = count; 5026 } 5027 } 5028 } 5029 5030 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5031 struct beacon_data *beacon) 5032 { 5033 if (beacon->cntdwn_current_counter == 1) { 5034 /* 5035 * Channel switch handling is done by a worker thread while 5036 * beacons get pulled from hardware timers. It's therefore 5037 * possible that software threads are slow enough to not be 5038 * able to complete CSA handling in a single beacon interval, 5039 * in which case we get here. There isn't much to do about 5040 * it, other than letting the user know that the AP isn't 5041 * behaving correctly. 5042 */ 5043 link_err_once(link, 5044 "beacon TX faster than countdown (channel/color switch) completion\n"); 5045 return 0; 5046 } 5047 5048 beacon->cntdwn_current_counter--; 5049 5050 return beacon->cntdwn_current_counter; 5051 } 5052 5053 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5054 { 5055 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5056 struct ieee80211_link_data *link; 5057 struct beacon_data *beacon = NULL; 5058 u8 count = 0; 5059 5060 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5061 return 0; 5062 5063 rcu_read_lock(); 5064 5065 link = rcu_dereference(sdata->link[link_id]); 5066 if (!link) 5067 goto unlock; 5068 5069 if (sdata->vif.type == NL80211_IFTYPE_AP) 5070 beacon = rcu_dereference(link->u.ap.beacon); 5071 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5072 beacon = rcu_dereference(sdata->u.ibss.presp); 5073 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5074 beacon = rcu_dereference(sdata->u.mesh.beacon); 5075 5076 if (!beacon) 5077 goto unlock; 5078 5079 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5080 5081 unlock: 5082 rcu_read_unlock(); 5083 return count; 5084 } 5085 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5086 5087 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5088 { 5089 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5090 struct beacon_data *beacon = NULL; 5091 5092 rcu_read_lock(); 5093 5094 if (sdata->vif.type == NL80211_IFTYPE_AP) 5095 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5096 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5097 beacon = rcu_dereference(sdata->u.ibss.presp); 5098 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5099 beacon = rcu_dereference(sdata->u.mesh.beacon); 5100 5101 if (!beacon) 5102 goto unlock; 5103 5104 if (counter < beacon->cntdwn_current_counter) 5105 beacon->cntdwn_current_counter = counter; 5106 5107 unlock: 5108 rcu_read_unlock(); 5109 } 5110 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5111 5112 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5113 unsigned int link_id) 5114 { 5115 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5116 struct ieee80211_link_data *link; 5117 struct beacon_data *beacon = NULL; 5118 u8 *beacon_data; 5119 size_t beacon_data_len; 5120 int ret = false; 5121 5122 if (!ieee80211_sdata_running(sdata)) 5123 return false; 5124 5125 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5126 return 0; 5127 5128 rcu_read_lock(); 5129 5130 link = rcu_dereference(sdata->link[link_id]); 5131 if (!link) 5132 goto out; 5133 5134 if (vif->type == NL80211_IFTYPE_AP) { 5135 beacon = rcu_dereference(link->u.ap.beacon); 5136 if (WARN_ON(!beacon || !beacon->tail)) 5137 goto out; 5138 beacon_data = beacon->tail; 5139 beacon_data_len = beacon->tail_len; 5140 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5141 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5142 5143 beacon = rcu_dereference(ifibss->presp); 5144 if (!beacon) 5145 goto out; 5146 5147 beacon_data = beacon->head; 5148 beacon_data_len = beacon->head_len; 5149 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5150 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5151 5152 beacon = rcu_dereference(ifmsh->beacon); 5153 if (!beacon) 5154 goto out; 5155 5156 beacon_data = beacon->head; 5157 beacon_data_len = beacon->head_len; 5158 } else { 5159 WARN_ON(1); 5160 goto out; 5161 } 5162 5163 if (!beacon->cntdwn_counter_offsets[0]) 5164 goto out; 5165 5166 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5167 goto out; 5168 5169 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5170 ret = true; 5171 5172 out: 5173 rcu_read_unlock(); 5174 5175 return ret; 5176 } 5177 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5178 5179 static int ieee80211_beacon_protect(struct sk_buff *skb, 5180 struct ieee80211_local *local, 5181 struct ieee80211_sub_if_data *sdata, 5182 struct ieee80211_link_data *link) 5183 { 5184 ieee80211_tx_result res; 5185 struct ieee80211_tx_data tx; 5186 struct sk_buff *check_skb; 5187 5188 memset(&tx, 0, sizeof(tx)); 5189 tx.key = rcu_dereference(link->default_beacon_key); 5190 if (!tx.key) 5191 return 0; 5192 5193 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5194 tx.key = NULL; 5195 return -EINVAL; 5196 } 5197 5198 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5199 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5200 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5201 5202 tx.local = local; 5203 tx.sdata = sdata; 5204 __skb_queue_head_init(&tx.skbs); 5205 __skb_queue_tail(&tx.skbs, skb); 5206 res = ieee80211_tx_h_encrypt(&tx); 5207 check_skb = __skb_dequeue(&tx.skbs); 5208 /* we may crash after this, but it'd be a bug in crypto */ 5209 WARN_ON(check_skb != skb); 5210 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5211 return -EINVAL; 5212 5213 return 0; 5214 } 5215 5216 static void 5217 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5218 struct ieee80211_vif *vif, 5219 struct ieee80211_link_data *link, 5220 struct ieee80211_mutable_offsets *offs, 5221 struct beacon_data *beacon, 5222 struct sk_buff *skb, 5223 struct ieee80211_chanctx_conf *chanctx_conf, 5224 u16 csa_off_base) 5225 { 5226 struct ieee80211_local *local = hw_to_local(hw); 5227 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5228 struct ieee80211_tx_info *info; 5229 enum nl80211_band band; 5230 struct ieee80211_tx_rate_control txrc; 5231 5232 /* CSA offsets */ 5233 if (offs && beacon) { 5234 u16 i; 5235 5236 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5237 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5238 5239 if (!csa_off) 5240 continue; 5241 5242 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5243 } 5244 } 5245 5246 band = chanctx_conf->def.chan->band; 5247 info = IEEE80211_SKB_CB(skb); 5248 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5249 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5250 info->band = band; 5251 5252 memset(&txrc, 0, sizeof(txrc)); 5253 txrc.hw = hw; 5254 txrc.sband = local->hw.wiphy->bands[band]; 5255 txrc.bss_conf = link->conf; 5256 txrc.skb = skb; 5257 txrc.reported_rate.idx = -1; 5258 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5259 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5260 else 5261 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5262 txrc.bss = true; 5263 rate_control_get_rate(sdata, NULL, &txrc); 5264 5265 info->control.vif = vif; 5266 info->control.flags |= u32_encode_bits(link->link_id, 5267 IEEE80211_TX_CTRL_MLO_LINK); 5268 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5269 IEEE80211_TX_CTL_ASSIGN_SEQ | 5270 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5271 } 5272 5273 static void 5274 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5275 u8 i) 5276 { 5277 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5278 i > beacon->mbssid_ies->cnt) 5279 return; 5280 5281 if (i < beacon->mbssid_ies->cnt) { 5282 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5283 beacon->mbssid_ies->elem[i].len); 5284 5285 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5286 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5287 beacon->rnr_ies->elem[i].len); 5288 5289 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5290 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5291 beacon->rnr_ies->elem[i].len); 5292 } 5293 return; 5294 } 5295 5296 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5297 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5298 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5299 beacon->mbssid_ies->elem[i].len); 5300 } 5301 5302 static struct sk_buff * 5303 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5304 struct ieee80211_vif *vif, 5305 struct ieee80211_link_data *link, 5306 struct ieee80211_mutable_offsets *offs, 5307 bool is_template, 5308 struct beacon_data *beacon, 5309 struct ieee80211_chanctx_conf *chanctx_conf, 5310 u8 ema_index) 5311 { 5312 struct ieee80211_local *local = hw_to_local(hw); 5313 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5314 struct ieee80211_if_ap *ap = &sdata->u.ap; 5315 struct sk_buff *skb = NULL; 5316 u16 csa_off_base = 0; 5317 int mbssid_len; 5318 5319 if (beacon->cntdwn_counter_offsets[0]) { 5320 if (!is_template) 5321 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5322 5323 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5324 } 5325 5326 /* headroom, head length, 5327 * tail length, maximum TIM length and multiple BSSID length 5328 */ 5329 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5330 beacon->rnr_ies, 5331 ema_index); 5332 5333 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5334 beacon->tail_len + 256 + 5335 local->hw.extra_beacon_tailroom + mbssid_len); 5336 if (!skb) 5337 return NULL; 5338 5339 skb_reserve(skb, local->tx_headroom); 5340 skb_put_data(skb, beacon->head, beacon->head_len); 5341 5342 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5343 5344 if (offs) { 5345 offs->tim_offset = beacon->head_len; 5346 offs->tim_length = skb->len - beacon->head_len; 5347 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5348 5349 if (mbssid_len) { 5350 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5351 offs->mbssid_off = skb->len - mbssid_len; 5352 } 5353 5354 /* for AP the csa offsets are from tail */ 5355 csa_off_base = skb->len; 5356 } 5357 5358 if (beacon->tail) 5359 skb_put_data(skb, beacon->tail, beacon->tail_len); 5360 5361 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5362 dev_kfree_skb(skb); 5363 return NULL; 5364 } 5365 5366 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5367 chanctx_conf, csa_off_base); 5368 return skb; 5369 } 5370 5371 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5372 struct ieee80211_link_data *link) 5373 { 5374 struct ps_data *ps = &sdata->u.ap.ps; 5375 5376 if (ps->sb_count == 0) 5377 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5378 else 5379 ps->sb_count--; 5380 5381 return ps->sb_count == 0; 5382 } 5383 5384 static struct sk_buff * 5385 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5386 struct ieee80211_vif *vif, 5387 struct ieee80211_link_data *link, 5388 struct ieee80211_chanctx_conf *chanctx_conf, 5389 struct s1g_short_beacon_data *sb, 5390 bool is_template) 5391 { 5392 struct ieee80211_local *local = hw_to_local(hw); 5393 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5394 struct ieee80211_if_ap *ap = &sdata->u.ap; 5395 struct sk_buff *skb; 5396 5397 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5398 sb->short_tail_len + 256 + 5399 local->hw.extra_beacon_tailroom); 5400 if (!skb) 5401 return NULL; 5402 5403 skb_reserve(skb, local->tx_headroom); 5404 skb_put_data(skb, sb->short_head, sb->short_head_len); 5405 5406 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5407 5408 if (sb->short_tail) 5409 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5410 5411 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5412 chanctx_conf, 0); 5413 return skb; 5414 } 5415 5416 static struct sk_buff * 5417 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5418 struct ieee80211_link_data *link, 5419 struct ieee80211_mutable_offsets *offs, 5420 bool is_template, struct beacon_data *beacon, 5421 struct ieee80211_chanctx_conf *chanctx_conf, 5422 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5423 { 5424 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5425 5426 if (!sdata->vif.cfg.s1g || !s1g_sb || 5427 ieee80211_s1g_need_long_beacon(sdata, link)) 5428 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5429 is_template, beacon, 5430 chanctx_conf, ema_index); 5431 5432 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5433 s1g_sb, is_template); 5434 } 5435 5436 static struct ieee80211_ema_beacons * 5437 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5438 struct ieee80211_vif *vif, 5439 struct ieee80211_link_data *link, 5440 struct ieee80211_mutable_offsets *offs, 5441 bool is_template, struct beacon_data *beacon, 5442 struct ieee80211_chanctx_conf *chanctx_conf) 5443 { 5444 struct ieee80211_ema_beacons *ema = NULL; 5445 5446 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5447 return NULL; 5448 5449 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5450 GFP_ATOMIC); 5451 if (!ema) 5452 return NULL; 5453 5454 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5455 ema->bcn[ema->cnt].skb = 5456 ieee80211_beacon_get_ap(hw, vif, link, 5457 &ema->bcn[ema->cnt].offs, 5458 is_template, beacon, 5459 chanctx_conf, ema->cnt, NULL); 5460 if (!ema->bcn[ema->cnt].skb) 5461 break; 5462 } 5463 5464 if (ema->cnt == beacon->mbssid_ies->cnt) 5465 return ema; 5466 5467 ieee80211_beacon_free_ema_list(ema); 5468 return NULL; 5469 } 5470 5471 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5472 5473 static struct sk_buff * 5474 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5475 struct ieee80211_vif *vif, 5476 struct ieee80211_mutable_offsets *offs, 5477 bool is_template, 5478 unsigned int link_id, 5479 int ema_index, 5480 struct ieee80211_ema_beacons **ema_beacons) 5481 { 5482 struct ieee80211_local *local = hw_to_local(hw); 5483 struct beacon_data *beacon = NULL; 5484 struct sk_buff *skb = NULL; 5485 struct ieee80211_sub_if_data *sdata = NULL; 5486 struct ieee80211_chanctx_conf *chanctx_conf; 5487 struct ieee80211_link_data *link; 5488 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5489 5490 rcu_read_lock(); 5491 5492 sdata = vif_to_sdata(vif); 5493 link = rcu_dereference(sdata->link[link_id]); 5494 if (!link) 5495 goto out; 5496 chanctx_conf = 5497 rcu_dereference(link->conf->chanctx_conf); 5498 5499 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5500 goto out; 5501 5502 if (offs) 5503 memset(offs, 0, sizeof(*offs)); 5504 5505 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5506 beacon = rcu_dereference(link->u.ap.beacon); 5507 if (!beacon) 5508 goto out; 5509 5510 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5511 s1g_short_bcn = 5512 rcu_dereference(link->u.ap.s1g_short_beacon); 5513 if (!s1g_short_bcn) 5514 goto out; 5515 } 5516 5517 if (ema_beacons) { 5518 *ema_beacons = 5519 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5520 offs, 5521 is_template, 5522 beacon, 5523 chanctx_conf); 5524 } else { 5525 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5526 if (ema_index >= beacon->mbssid_ies->cnt) 5527 goto out; /* End of MBSSID elements */ 5528 5529 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5530 ema_index = beacon->mbssid_ies->cnt; 5531 } else { 5532 ema_index = 0; 5533 } 5534 5535 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5536 is_template, beacon, 5537 chanctx_conf, ema_index, 5538 s1g_short_bcn); 5539 } 5540 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5541 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5542 struct ieee80211_hdr *hdr; 5543 5544 beacon = rcu_dereference(ifibss->presp); 5545 if (!beacon) 5546 goto out; 5547 5548 if (beacon->cntdwn_counter_offsets[0]) { 5549 if (!is_template) 5550 __ieee80211_beacon_update_cntdwn(link, beacon); 5551 5552 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5553 } 5554 5555 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5556 local->hw.extra_beacon_tailroom); 5557 if (!skb) 5558 goto out; 5559 skb_reserve(skb, local->tx_headroom); 5560 skb_put_data(skb, beacon->head, beacon->head_len); 5561 5562 hdr = (struct ieee80211_hdr *) skb->data; 5563 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5564 IEEE80211_STYPE_BEACON); 5565 5566 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5567 chanctx_conf, 0); 5568 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5569 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5570 5571 beacon = rcu_dereference(ifmsh->beacon); 5572 if (!beacon) 5573 goto out; 5574 5575 if (beacon->cntdwn_counter_offsets[0]) { 5576 if (!is_template) 5577 /* TODO: For mesh csa_counter is in TU, so 5578 * decrementing it by one isn't correct, but 5579 * for now we leave it consistent with overall 5580 * mac80211's behavior. 5581 */ 5582 __ieee80211_beacon_update_cntdwn(link, beacon); 5583 5584 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5585 } 5586 5587 if (ifmsh->sync_ops) 5588 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5589 5590 skb = dev_alloc_skb(local->tx_headroom + 5591 beacon->head_len + 5592 256 + /* TIM IE */ 5593 beacon->tail_len + 5594 local->hw.extra_beacon_tailroom); 5595 if (!skb) 5596 goto out; 5597 skb_reserve(skb, local->tx_headroom); 5598 skb_put_data(skb, beacon->head, beacon->head_len); 5599 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5600 is_template); 5601 5602 if (offs) { 5603 offs->tim_offset = beacon->head_len; 5604 offs->tim_length = skb->len - beacon->head_len; 5605 } 5606 5607 skb_put_data(skb, beacon->tail, beacon->tail_len); 5608 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5609 chanctx_conf, 0); 5610 } else { 5611 WARN_ON(1); 5612 goto out; 5613 } 5614 5615 out: 5616 rcu_read_unlock(); 5617 return skb; 5618 5619 } 5620 5621 struct sk_buff * 5622 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5623 struct ieee80211_vif *vif, 5624 struct ieee80211_mutable_offsets *offs, 5625 unsigned int link_id) 5626 { 5627 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5628 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5629 } 5630 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5631 5632 struct sk_buff * 5633 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5634 struct ieee80211_vif *vif, 5635 struct ieee80211_mutable_offsets *offs, 5636 unsigned int link_id, u8 ema_index) 5637 { 5638 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5639 NULL); 5640 } 5641 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5642 5643 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5644 { 5645 u8 i; 5646 5647 if (!ema_beacons) 5648 return; 5649 5650 for (i = 0; i < ema_beacons->cnt; i++) 5651 kfree_skb(ema_beacons->bcn[i].skb); 5652 5653 kfree(ema_beacons); 5654 } 5655 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5656 5657 struct ieee80211_ema_beacons * 5658 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5659 struct ieee80211_vif *vif, 5660 unsigned int link_id) 5661 { 5662 struct ieee80211_ema_beacons *ema_beacons = NULL; 5663 5664 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5665 &ema_beacons)); 5666 5667 return ema_beacons; 5668 } 5669 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5670 5671 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5672 struct ieee80211_vif *vif, 5673 u16 *tim_offset, u16 *tim_length, 5674 unsigned int link_id) 5675 { 5676 struct ieee80211_mutable_offsets offs = {}; 5677 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5678 link_id, 5679 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5680 NULL); 5681 struct sk_buff *copy; 5682 5683 if (!bcn) 5684 return bcn; 5685 5686 if (tim_offset) 5687 *tim_offset = offs.tim_offset; 5688 5689 if (tim_length) 5690 *tim_length = offs.tim_length; 5691 5692 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5693 !hw_to_local(hw)->monitors) 5694 return bcn; 5695 5696 /* send a copy to monitor interfaces */ 5697 copy = skb_copy(bcn, GFP_ATOMIC); 5698 if (!copy) 5699 return bcn; 5700 5701 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 5702 5703 return bcn; 5704 } 5705 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5706 5707 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5708 struct ieee80211_vif *vif) 5709 { 5710 struct sk_buff *skb = NULL; 5711 struct probe_resp *presp = NULL; 5712 struct ieee80211_hdr *hdr; 5713 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5714 5715 if (sdata->vif.type != NL80211_IFTYPE_AP) 5716 return NULL; 5717 5718 rcu_read_lock(); 5719 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5720 if (!presp) 5721 goto out; 5722 5723 skb = dev_alloc_skb(presp->len); 5724 if (!skb) 5725 goto out; 5726 5727 skb_put_data(skb, presp->data, presp->len); 5728 5729 hdr = (struct ieee80211_hdr *) skb->data; 5730 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5731 5732 out: 5733 rcu_read_unlock(); 5734 return skb; 5735 } 5736 EXPORT_SYMBOL(ieee80211_proberesp_get); 5737 5738 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5739 struct ieee80211_vif *vif) 5740 { 5741 struct sk_buff *skb = NULL; 5742 struct fils_discovery_data *tmpl = NULL; 5743 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5744 5745 if (sdata->vif.type != NL80211_IFTYPE_AP) 5746 return NULL; 5747 5748 rcu_read_lock(); 5749 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5750 if (!tmpl) { 5751 rcu_read_unlock(); 5752 return NULL; 5753 } 5754 5755 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5756 if (skb) { 5757 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5758 skb_put_data(skb, tmpl->data, tmpl->len); 5759 } 5760 5761 rcu_read_unlock(); 5762 return skb; 5763 } 5764 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5765 5766 struct sk_buff * 5767 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5768 struct ieee80211_vif *vif) 5769 { 5770 struct sk_buff *skb = NULL; 5771 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5772 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5773 5774 if (sdata->vif.type != NL80211_IFTYPE_AP) 5775 return NULL; 5776 5777 rcu_read_lock(); 5778 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5779 if (!tmpl) { 5780 rcu_read_unlock(); 5781 return NULL; 5782 } 5783 5784 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5785 if (skb) { 5786 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5787 skb_put_data(skb, tmpl->data, tmpl->len); 5788 } 5789 5790 rcu_read_unlock(); 5791 return skb; 5792 } 5793 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5794 5795 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5796 struct ieee80211_vif *vif) 5797 { 5798 struct ieee80211_sub_if_data *sdata; 5799 struct ieee80211_pspoll *pspoll; 5800 struct ieee80211_local *local; 5801 struct sk_buff *skb; 5802 5803 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5804 return NULL; 5805 5806 sdata = vif_to_sdata(vif); 5807 local = sdata->local; 5808 5809 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5810 if (!skb) 5811 return NULL; 5812 5813 skb_reserve(skb, local->hw.extra_tx_headroom); 5814 5815 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5816 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5817 IEEE80211_STYPE_PSPOLL); 5818 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5819 5820 /* aid in PS-Poll has its two MSBs each set to 1 */ 5821 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5822 5823 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5824 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5825 5826 return skb; 5827 } 5828 EXPORT_SYMBOL(ieee80211_pspoll_get); 5829 5830 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5831 struct ieee80211_vif *vif, 5832 int link_id, bool qos_ok) 5833 { 5834 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5835 struct ieee80211_local *local = sdata->local; 5836 struct ieee80211_link_data *link = NULL; 5837 struct ieee80211_hdr_3addr *nullfunc; 5838 struct sk_buff *skb; 5839 bool qos = false; 5840 5841 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5842 return NULL; 5843 5844 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5845 sizeof(*nullfunc) + 2); 5846 if (!skb) 5847 return NULL; 5848 5849 rcu_read_lock(); 5850 if (qos_ok) { 5851 struct sta_info *sta; 5852 5853 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5854 qos = sta && sta->sta.wme; 5855 } 5856 5857 if (link_id >= 0) { 5858 link = rcu_dereference(sdata->link[link_id]); 5859 if (WARN_ON_ONCE(!link)) { 5860 rcu_read_unlock(); 5861 kfree_skb(skb); 5862 return NULL; 5863 } 5864 } 5865 5866 skb_reserve(skb, local->hw.extra_tx_headroom); 5867 5868 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5869 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5870 IEEE80211_STYPE_NULLFUNC | 5871 IEEE80211_FCTL_TODS); 5872 if (qos) { 5873 __le16 qoshdr = cpu_to_le16(7); 5874 5875 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5876 IEEE80211_STYPE_NULLFUNC) != 5877 IEEE80211_STYPE_QOS_NULLFUNC); 5878 nullfunc->frame_control |= 5879 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5880 skb->priority = 7; 5881 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5882 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5883 } 5884 5885 if (link) { 5886 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5887 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5888 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5889 } else { 5890 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5891 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5892 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5893 } 5894 rcu_read_unlock(); 5895 5896 return skb; 5897 } 5898 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5899 5900 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5901 const u8 *src_addr, 5902 const u8 *ssid, size_t ssid_len, 5903 size_t tailroom) 5904 { 5905 struct ieee80211_local *local = hw_to_local(hw); 5906 struct ieee80211_hdr_3addr *hdr; 5907 struct sk_buff *skb; 5908 size_t ie_ssid_len; 5909 u8 *pos; 5910 5911 ie_ssid_len = 2 + ssid_len; 5912 5913 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5914 ie_ssid_len + tailroom); 5915 if (!skb) 5916 return NULL; 5917 5918 skb_reserve(skb, local->hw.extra_tx_headroom); 5919 5920 hdr = skb_put_zero(skb, sizeof(*hdr)); 5921 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5922 IEEE80211_STYPE_PROBE_REQ); 5923 eth_broadcast_addr(hdr->addr1); 5924 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5925 eth_broadcast_addr(hdr->addr3); 5926 5927 pos = skb_put(skb, ie_ssid_len); 5928 *pos++ = WLAN_EID_SSID; 5929 *pos++ = ssid_len; 5930 if (ssid_len) 5931 memcpy(pos, ssid, ssid_len); 5932 pos += ssid_len; 5933 5934 return skb; 5935 } 5936 EXPORT_SYMBOL(ieee80211_probereq_get); 5937 5938 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5939 const void *frame, size_t frame_len, 5940 const struct ieee80211_tx_info *frame_txctl, 5941 struct ieee80211_rts *rts) 5942 { 5943 const struct ieee80211_hdr *hdr = frame; 5944 5945 rts->frame_control = 5946 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5947 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5948 frame_txctl); 5949 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5950 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5951 } 5952 EXPORT_SYMBOL(ieee80211_rts_get); 5953 5954 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5955 const void *frame, size_t frame_len, 5956 const struct ieee80211_tx_info *frame_txctl, 5957 struct ieee80211_cts *cts) 5958 { 5959 const struct ieee80211_hdr *hdr = frame; 5960 5961 cts->frame_control = 5962 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5963 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5964 frame_len, frame_txctl); 5965 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5966 } 5967 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5968 5969 struct sk_buff * 5970 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5971 struct ieee80211_vif *vif) 5972 { 5973 struct ieee80211_local *local = hw_to_local(hw); 5974 struct sk_buff *skb = NULL; 5975 struct ieee80211_tx_data tx; 5976 struct ieee80211_sub_if_data *sdata; 5977 struct ps_data *ps; 5978 struct ieee80211_tx_info *info; 5979 struct ieee80211_chanctx_conf *chanctx_conf; 5980 5981 sdata = vif_to_sdata(vif); 5982 5983 rcu_read_lock(); 5984 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5985 5986 if (!chanctx_conf) 5987 goto out; 5988 5989 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5990 struct beacon_data *beacon = 5991 rcu_dereference(sdata->deflink.u.ap.beacon); 5992 5993 if (!beacon || !beacon->head) 5994 goto out; 5995 5996 ps = &sdata->u.ap.ps; 5997 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5998 ps = &sdata->u.mesh.ps; 5999 } else { 6000 goto out; 6001 } 6002 6003 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6004 goto out; /* send buffered bc/mc only after DTIM beacon */ 6005 6006 while (1) { 6007 skb = skb_dequeue(&ps->bc_buf); 6008 if (!skb) 6009 goto out; 6010 local->total_ps_buffered--; 6011 6012 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6013 struct ieee80211_hdr *hdr = 6014 (struct ieee80211_hdr *) skb->data; 6015 /* more buffered multicast/broadcast frames ==> set 6016 * MoreData flag in IEEE 802.11 header to inform PS 6017 * STAs */ 6018 hdr->frame_control |= 6019 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6020 } 6021 6022 if (sdata->vif.type == NL80211_IFTYPE_AP) 6023 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6024 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6025 break; 6026 ieee80211_free_txskb(hw, skb); 6027 } 6028 6029 info = IEEE80211_SKB_CB(skb); 6030 6031 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6032 info->band = chanctx_conf->def.chan->band; 6033 6034 if (invoke_tx_handlers(&tx)) 6035 skb = NULL; 6036 out: 6037 rcu_read_unlock(); 6038 6039 return skb; 6040 } 6041 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6042 6043 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6044 { 6045 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6046 struct ieee80211_sub_if_data *sdata = sta->sdata; 6047 struct ieee80211_local *local = sdata->local; 6048 int ret; 6049 u32 queues; 6050 6051 lockdep_assert_wiphy(local->hw.wiphy); 6052 6053 /* only some cases are supported right now */ 6054 switch (sdata->vif.type) { 6055 case NL80211_IFTYPE_STATION: 6056 case NL80211_IFTYPE_AP: 6057 case NL80211_IFTYPE_AP_VLAN: 6058 break; 6059 default: 6060 WARN_ON(1); 6061 return -EINVAL; 6062 } 6063 6064 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6065 return -EINVAL; 6066 6067 if (sta->reserved_tid == tid) { 6068 ret = 0; 6069 goto out; 6070 } 6071 6072 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6073 sdata_err(sdata, "TID reservation already active\n"); 6074 ret = -EALREADY; 6075 goto out; 6076 } 6077 6078 ieee80211_stop_vif_queues(sdata->local, sdata, 6079 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6080 6081 synchronize_net(); 6082 6083 /* Tear down BA sessions so we stop aggregating on this TID */ 6084 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6085 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6086 __ieee80211_stop_tx_ba_session(sta, tid, 6087 AGG_STOP_LOCAL_REQUEST); 6088 } 6089 6090 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6091 __ieee80211_flush_queues(local, sdata, queues, false); 6092 6093 sta->reserved_tid = tid; 6094 6095 ieee80211_wake_vif_queues(local, sdata, 6096 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6097 6098 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6099 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6100 6101 ret = 0; 6102 out: 6103 return ret; 6104 } 6105 EXPORT_SYMBOL(ieee80211_reserve_tid); 6106 6107 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6108 { 6109 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6110 struct ieee80211_sub_if_data *sdata = sta->sdata; 6111 6112 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6113 6114 /* only some cases are supported right now */ 6115 switch (sdata->vif.type) { 6116 case NL80211_IFTYPE_STATION: 6117 case NL80211_IFTYPE_AP: 6118 case NL80211_IFTYPE_AP_VLAN: 6119 break; 6120 default: 6121 WARN_ON(1); 6122 return; 6123 } 6124 6125 if (tid != sta->reserved_tid) { 6126 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6127 return; 6128 } 6129 6130 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6131 } 6132 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6133 6134 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6135 struct sk_buff *skb, int tid, int link_id, 6136 enum nl80211_band band) 6137 { 6138 const struct ieee80211_hdr *hdr = (void *)skb->data; 6139 int ac = ieee80211_ac_from_tid(tid); 6140 unsigned int link; 6141 6142 skb_reset_mac_header(skb); 6143 skb_set_queue_mapping(skb, ac); 6144 skb->priority = tid; 6145 6146 skb->dev = sdata->dev; 6147 6148 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6149 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6150 IEEE80211_LINK_UNSPECIFIED)); 6151 6152 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6153 link = 0; 6154 } else if (link_id >= 0) { 6155 link = link_id; 6156 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6157 /* address from the MLD */ 6158 link = IEEE80211_LINK_UNSPECIFIED; 6159 } else { 6160 /* otherwise must be addressed from a link */ 6161 rcu_read_lock(); 6162 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6163 struct ieee80211_bss_conf *link_conf; 6164 6165 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6166 if (!link_conf) 6167 continue; 6168 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6169 break; 6170 } 6171 rcu_read_unlock(); 6172 6173 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6174 link = ffs(sdata->vif.active_links) - 1; 6175 } 6176 6177 IEEE80211_SKB_CB(skb)->control.flags |= 6178 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6179 6180 /* 6181 * The other path calling ieee80211_xmit is from the tasklet, 6182 * and while we can handle concurrent transmissions locking 6183 * requirements are that we do not come into tx with bhs on. 6184 */ 6185 local_bh_disable(); 6186 IEEE80211_SKB_CB(skb)->band = band; 6187 ieee80211_xmit(sdata, NULL, skb); 6188 local_bh_enable(); 6189 } 6190 6191 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6192 struct sk_buff *skb, int tid, int link_id) 6193 { 6194 struct ieee80211_chanctx_conf *chanctx_conf; 6195 enum nl80211_band band; 6196 6197 rcu_read_lock(); 6198 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6199 WARN_ON(link_id >= 0); 6200 chanctx_conf = 6201 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6202 if (WARN_ON(!chanctx_conf)) { 6203 rcu_read_unlock(); 6204 kfree_skb(skb); 6205 return; 6206 } 6207 band = chanctx_conf->def.chan->band; 6208 } else { 6209 WARN_ON(link_id >= 0 && 6210 !(sdata->vif.active_links & BIT(link_id))); 6211 /* MLD transmissions must not rely on the band */ 6212 band = 0; 6213 } 6214 6215 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6216 rcu_read_unlock(); 6217 } 6218 6219 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6220 const u8 *buf, size_t len, 6221 const u8 *dest, __be16 proto, bool unencrypted, 6222 int link_id, u64 *cookie) 6223 { 6224 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6225 struct ieee80211_local *local = sdata->local; 6226 struct sta_info *sta; 6227 struct sk_buff *skb; 6228 struct ethhdr *ehdr; 6229 u32 ctrl_flags = 0; 6230 u32 flags = 0; 6231 int err; 6232 6233 /* mutex lock is only needed for incrementing the cookie counter */ 6234 lockdep_assert_wiphy(local->hw.wiphy); 6235 6236 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6237 * or Pre-Authentication 6238 */ 6239 if (proto != sdata->control_port_protocol && 6240 proto != cpu_to_be16(ETH_P_PREAUTH)) 6241 return -EINVAL; 6242 6243 if (proto == sdata->control_port_protocol) 6244 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6245 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6246 6247 if (unencrypted) 6248 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6249 6250 if (cookie) 6251 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6252 6253 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6254 6255 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6256 sizeof(struct ethhdr) + len); 6257 if (!skb) 6258 return -ENOMEM; 6259 6260 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6261 6262 skb_put_data(skb, buf, len); 6263 6264 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6265 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6266 6267 /* we may override the SA for MLO STA later */ 6268 if (link_id < 0) { 6269 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6270 IEEE80211_TX_CTRL_MLO_LINK); 6271 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6272 } else { 6273 struct ieee80211_bss_conf *link_conf; 6274 6275 ctrl_flags |= u32_encode_bits(link_id, 6276 IEEE80211_TX_CTRL_MLO_LINK); 6277 6278 rcu_read_lock(); 6279 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6280 if (!link_conf) { 6281 dev_kfree_skb(skb); 6282 rcu_read_unlock(); 6283 return -ENOLINK; 6284 } 6285 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6286 rcu_read_unlock(); 6287 } 6288 6289 ehdr->h_proto = proto; 6290 6291 skb->dev = dev; 6292 skb->protocol = proto; 6293 skb_reset_network_header(skb); 6294 skb_reset_mac_header(skb); 6295 6296 if (local->hw.queues < IEEE80211_NUM_ACS) 6297 goto start_xmit; 6298 6299 /* update QoS header to prioritize control port frames if possible, 6300 * prioritization also happens for control port frames send over 6301 * AF_PACKET 6302 */ 6303 rcu_read_lock(); 6304 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6305 if (err) { 6306 dev_kfree_skb(skb); 6307 rcu_read_unlock(); 6308 return err; 6309 } 6310 6311 if (!IS_ERR(sta)) { 6312 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6313 6314 skb_set_queue_mapping(skb, queue); 6315 6316 /* 6317 * for MLO STA, the SA should be the AP MLD address, but 6318 * the link ID has been selected already 6319 */ 6320 if (sta && sta->sta.mlo) 6321 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6322 } 6323 rcu_read_unlock(); 6324 6325 start_xmit: 6326 local_bh_disable(); 6327 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6328 local_bh_enable(); 6329 6330 return 0; 6331 } 6332 6333 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6334 const u8 *buf, size_t len) 6335 { 6336 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6337 struct ieee80211_local *local = sdata->local; 6338 struct sk_buff *skb; 6339 6340 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6341 30 + /* header size */ 6342 18); /* 11s header size */ 6343 if (!skb) 6344 return -ENOMEM; 6345 6346 skb_reserve(skb, local->hw.extra_tx_headroom); 6347 skb_put_data(skb, buf, len); 6348 6349 skb->dev = dev; 6350 skb->protocol = htons(ETH_P_802_3); 6351 skb_reset_network_header(skb); 6352 skb_reset_mac_header(skb); 6353 6354 local_bh_disable(); 6355 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6356 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6357 NULL); 6358 local_bh_enable(); 6359 6360 return 0; 6361 } 6362