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 tx->sdata->tx_handlers_drop++; 1818 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1819 if (tx->skb) 1820 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1821 else 1822 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1823 return -1; 1824 } else if (unlikely(res == TX_QUEUED)) { 1825 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1826 return -1; 1827 } 1828 1829 return 0; 1830 } 1831 1832 /* 1833 * Late handlers can be called while the sta lock is held. Handlers that can 1834 * cause packets to be generated will cause deadlock! 1835 */ 1836 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1837 { 1838 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1839 ieee80211_tx_result res = TX_CONTINUE; 1840 1841 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1842 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1843 1844 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1845 __skb_queue_tail(&tx->skbs, tx->skb); 1846 tx->skb = NULL; 1847 goto txh_done; 1848 } 1849 1850 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1851 CALL_TXH(ieee80211_tx_h_sequence); 1852 CALL_TXH(ieee80211_tx_h_fragment); 1853 /* handlers after fragment must be aware of tx info fragmentation! */ 1854 CALL_TXH(ieee80211_tx_h_stats); 1855 CALL_TXH(ieee80211_tx_h_encrypt); 1856 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1857 CALL_TXH(ieee80211_tx_h_calculate_duration); 1858 #undef CALL_TXH 1859 1860 txh_done: 1861 if (unlikely(res == TX_DROP)) { 1862 tx->sdata->tx_handlers_drop++; 1863 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1864 if (tx->skb) 1865 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1866 else 1867 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1868 return -1; 1869 } else if (unlikely(res == TX_QUEUED)) { 1870 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1871 return -1; 1872 } 1873 1874 return 0; 1875 } 1876 1877 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1878 { 1879 int r = invoke_tx_handlers_early(tx); 1880 1881 if (r) 1882 return r; 1883 return invoke_tx_handlers_late(tx); 1884 } 1885 1886 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1887 struct ieee80211_vif *vif, struct sk_buff *skb, 1888 int band, struct ieee80211_sta **sta) 1889 { 1890 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1891 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1892 struct ieee80211_tx_data tx; 1893 struct sk_buff *skb2; 1894 1895 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1896 return false; 1897 1898 info->band = band; 1899 info->control.vif = vif; 1900 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1901 1902 if (invoke_tx_handlers(&tx)) 1903 return false; 1904 1905 if (sta) { 1906 if (tx.sta) 1907 *sta = &tx.sta->sta; 1908 else 1909 *sta = NULL; 1910 } 1911 1912 /* this function isn't suitable for fragmented data frames */ 1913 skb2 = __skb_dequeue(&tx.skbs); 1914 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1915 ieee80211_free_txskb(hw, skb2); 1916 ieee80211_purge_tx_queue(hw, &tx.skbs); 1917 return false; 1918 } 1919 1920 return true; 1921 } 1922 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1923 1924 /* 1925 * Returns false if the frame couldn't be transmitted but was queued instead. 1926 */ 1927 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1928 struct sta_info *sta, struct sk_buff *skb, 1929 bool txpending) 1930 { 1931 struct ieee80211_local *local = sdata->local; 1932 struct ieee80211_tx_data tx; 1933 ieee80211_tx_result res_prepare; 1934 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1935 bool result = true; 1936 1937 if (unlikely(skb->len < 10)) { 1938 dev_kfree_skb(skb); 1939 return true; 1940 } 1941 1942 /* initialises tx */ 1943 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1944 1945 if (unlikely(res_prepare == TX_DROP)) { 1946 ieee80211_free_txskb(&local->hw, skb); 1947 tx.sdata->tx_handlers_drop++; 1948 return true; 1949 } else if (unlikely(res_prepare == TX_QUEUED)) { 1950 return true; 1951 } 1952 1953 /* set up hw_queue value early */ 1954 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1955 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1956 info->hw_queue = 1957 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1958 1959 if (invoke_tx_handlers_early(&tx)) 1960 return true; 1961 1962 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1963 return true; 1964 1965 if (!invoke_tx_handlers_late(&tx)) 1966 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1967 1968 return result; 1969 } 1970 1971 /* device xmit handlers */ 1972 1973 enum ieee80211_encrypt { 1974 ENCRYPT_NO, 1975 ENCRYPT_MGMT, 1976 ENCRYPT_DATA, 1977 }; 1978 1979 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1980 struct sk_buff *skb, 1981 int head_need, 1982 enum ieee80211_encrypt encrypt) 1983 { 1984 struct ieee80211_local *local = sdata->local; 1985 bool enc_tailroom; 1986 int tail_need = 0; 1987 1988 enc_tailroom = encrypt == ENCRYPT_MGMT || 1989 (encrypt == ENCRYPT_DATA && 1990 sdata->crypto_tx_tailroom_needed_cnt); 1991 1992 if (enc_tailroom) { 1993 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1994 tail_need -= skb_tailroom(skb); 1995 tail_need = max_t(int, tail_need, 0); 1996 } 1997 1998 if (skb_cloned(skb) && 1999 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2000 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2001 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2002 else if (head_need || tail_need) 2003 I802_DEBUG_INC(local->tx_expand_skb_head); 2004 else 2005 return 0; 2006 2007 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2008 wiphy_debug(local->hw.wiphy, 2009 "failed to reallocate TX buffer\n"); 2010 return -ENOMEM; 2011 } 2012 2013 return 0; 2014 } 2015 2016 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2017 struct sta_info *sta, struct sk_buff *skb) 2018 { 2019 struct ieee80211_local *local = sdata->local; 2020 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2021 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2022 int headroom; 2023 enum ieee80211_encrypt encrypt; 2024 2025 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2026 encrypt = ENCRYPT_NO; 2027 else if (ieee80211_is_mgmt(hdr->frame_control)) 2028 encrypt = ENCRYPT_MGMT; 2029 else 2030 encrypt = ENCRYPT_DATA; 2031 2032 headroom = local->tx_headroom; 2033 if (encrypt != ENCRYPT_NO) 2034 headroom += IEEE80211_ENCRYPT_HEADROOM; 2035 headroom -= skb_headroom(skb); 2036 headroom = max_t(int, 0, headroom); 2037 2038 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2039 ieee80211_free_txskb(&local->hw, skb); 2040 return; 2041 } 2042 2043 /* reload after potential resize */ 2044 hdr = (struct ieee80211_hdr *) skb->data; 2045 info->control.vif = &sdata->vif; 2046 2047 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2048 if (ieee80211_is_data(hdr->frame_control) && 2049 is_unicast_ether_addr(hdr->addr1)) { 2050 if (mesh_nexthop_resolve(sdata, skb)) 2051 return; /* skb queued: don't free */ 2052 } else { 2053 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2054 } 2055 } 2056 2057 ieee80211_set_qos_hdr(sdata, skb); 2058 ieee80211_tx(sdata, sta, skb, false); 2059 } 2060 2061 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2062 { 2063 struct ieee80211_radiotap_header *rthdr = 2064 (struct ieee80211_radiotap_header *)skb->data; 2065 2066 /* check for not even having the fixed radiotap header part */ 2067 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2068 return false; /* too short to be possibly valid */ 2069 2070 /* is it a header version we can trust to find length from? */ 2071 if (unlikely(rthdr->it_version)) 2072 return false; /* only version 0 is supported */ 2073 2074 /* does the skb contain enough to deliver on the alleged length? */ 2075 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2076 return false; /* skb too short for claimed rt header extent */ 2077 2078 return true; 2079 } 2080 2081 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2082 struct net_device *dev) 2083 { 2084 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2085 struct ieee80211_radiotap_iterator iterator; 2086 struct ieee80211_radiotap_header *rthdr = 2087 (struct ieee80211_radiotap_header *) skb->data; 2088 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2089 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2090 NULL); 2091 u16 txflags; 2092 u16 rate = 0; 2093 bool rate_found = false; 2094 u8 rate_retries = 0; 2095 u16 rate_flags = 0; 2096 u8 mcs_known, mcs_flags, mcs_bw; 2097 u16 vht_known; 2098 u8 vht_mcs = 0, vht_nss = 0; 2099 int i; 2100 2101 if (!ieee80211_validate_radiotap_len(skb)) 2102 return false; 2103 2104 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2105 IEEE80211_TX_CTL_DONTFRAG; 2106 2107 /* 2108 * for every radiotap entry that is present 2109 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2110 * entries present, or -EINVAL on error) 2111 */ 2112 2113 while (!ret) { 2114 ret = ieee80211_radiotap_iterator_next(&iterator); 2115 2116 if (ret) 2117 continue; 2118 2119 /* see if this argument is something we can use */ 2120 switch (iterator.this_arg_index) { 2121 /* 2122 * You must take care when dereferencing iterator.this_arg 2123 * for multibyte types... the pointer is not aligned. Use 2124 * get_unaligned((type *)iterator.this_arg) to dereference 2125 * iterator.this_arg for type "type" safely on all arches. 2126 */ 2127 case IEEE80211_RADIOTAP_FLAGS: 2128 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2129 /* 2130 * this indicates that the skb we have been 2131 * handed has the 32-bit FCS CRC at the end... 2132 * we should react to that by snipping it off 2133 * because it will be recomputed and added 2134 * on transmission 2135 */ 2136 if (skb->len < (iterator._max_length + FCS_LEN)) 2137 return false; 2138 2139 skb_trim(skb, skb->len - FCS_LEN); 2140 } 2141 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2142 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2143 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2144 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2145 break; 2146 2147 case IEEE80211_RADIOTAP_TX_FLAGS: 2148 txflags = get_unaligned_le16(iterator.this_arg); 2149 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2150 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2151 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2152 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2153 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2154 info->control.flags |= 2155 IEEE80211_TX_CTRL_DONT_REORDER; 2156 break; 2157 2158 case IEEE80211_RADIOTAP_RATE: 2159 rate = *iterator.this_arg; 2160 rate_flags = 0; 2161 rate_found = true; 2162 break; 2163 2164 case IEEE80211_RADIOTAP_ANTENNA: 2165 /* this can appear multiple times, keep a bitmap */ 2166 info->control.antennas |= BIT(*iterator.this_arg); 2167 break; 2168 2169 case IEEE80211_RADIOTAP_DATA_RETRIES: 2170 rate_retries = *iterator.this_arg; 2171 break; 2172 2173 case IEEE80211_RADIOTAP_MCS: 2174 mcs_known = iterator.this_arg[0]; 2175 mcs_flags = iterator.this_arg[1]; 2176 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2177 break; 2178 2179 rate_found = true; 2180 rate = iterator.this_arg[2]; 2181 rate_flags = IEEE80211_TX_RC_MCS; 2182 2183 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2184 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2185 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2186 2187 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2188 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2189 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2190 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2191 2192 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2193 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2194 info->flags |= IEEE80211_TX_CTL_LDPC; 2195 2196 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2197 u8 stbc = u8_get_bits(mcs_flags, 2198 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2199 2200 info->flags |= 2201 u32_encode_bits(stbc, 2202 IEEE80211_TX_CTL_STBC); 2203 } 2204 break; 2205 2206 case IEEE80211_RADIOTAP_VHT: 2207 vht_known = get_unaligned_le16(iterator.this_arg); 2208 rate_found = true; 2209 2210 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2211 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2212 (iterator.this_arg[2] & 2213 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2214 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2215 if (vht_known & 2216 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2217 if (iterator.this_arg[3] == 1) 2218 rate_flags |= 2219 IEEE80211_TX_RC_40_MHZ_WIDTH; 2220 else if (iterator.this_arg[3] == 4) 2221 rate_flags |= 2222 IEEE80211_TX_RC_80_MHZ_WIDTH; 2223 else if (iterator.this_arg[3] == 11) 2224 rate_flags |= 2225 IEEE80211_TX_RC_160_MHZ_WIDTH; 2226 } 2227 2228 vht_mcs = iterator.this_arg[4] >> 4; 2229 if (vht_mcs > 11) 2230 vht_mcs = 0; 2231 vht_nss = iterator.this_arg[4] & 0xF; 2232 if (!vht_nss || vht_nss > 8) 2233 vht_nss = 1; 2234 break; 2235 2236 /* 2237 * Please update the file 2238 * Documentation/networking/mac80211-injection.rst 2239 * when parsing new fields here. 2240 */ 2241 2242 default: 2243 break; 2244 } 2245 } 2246 2247 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2248 return false; 2249 2250 if (rate_found) { 2251 struct ieee80211_supported_band *sband = 2252 local->hw.wiphy->bands[info->band]; 2253 2254 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2255 2256 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2257 info->control.rates[i].idx = -1; 2258 info->control.rates[i].flags = 0; 2259 info->control.rates[i].count = 0; 2260 } 2261 2262 if (rate_flags & IEEE80211_TX_RC_MCS) { 2263 /* reset antennas if not enough */ 2264 if (IEEE80211_HT_MCS_CHAINS(rate) > 2265 hweight8(info->control.antennas)) 2266 info->control.antennas = 0; 2267 2268 info->control.rates[0].idx = rate; 2269 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2270 /* reset antennas if not enough */ 2271 if (vht_nss > hweight8(info->control.antennas)) 2272 info->control.antennas = 0; 2273 2274 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2275 vht_nss); 2276 } else if (sband) { 2277 for (i = 0; i < sband->n_bitrates; i++) { 2278 if (rate * 5 != sband->bitrates[i].bitrate) 2279 continue; 2280 2281 info->control.rates[0].idx = i; 2282 break; 2283 } 2284 } 2285 2286 if (info->control.rates[0].idx < 0) 2287 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2288 2289 info->control.rates[0].flags = rate_flags; 2290 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2291 local->hw.max_rate_tries); 2292 } 2293 2294 return true; 2295 } 2296 2297 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2298 struct net_device *dev) 2299 { 2300 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2301 struct ieee80211_chanctx_conf *chanctx_conf; 2302 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2303 struct ieee80211_hdr *hdr; 2304 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2305 struct cfg80211_chan_def *chandef; 2306 u16 len_rthdr; 2307 int hdrlen; 2308 2309 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2310 if (unlikely(!ieee80211_sdata_running(sdata))) 2311 goto fail; 2312 2313 memset(info, 0, sizeof(*info)); 2314 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2315 IEEE80211_TX_CTL_INJECTED; 2316 2317 /* Sanity-check the length of the radiotap header */ 2318 if (!ieee80211_validate_radiotap_len(skb)) 2319 goto fail; 2320 2321 /* we now know there is a radiotap header with a length we can use */ 2322 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2323 2324 /* 2325 * fix up the pointers accounting for the radiotap 2326 * header still being in there. We are being given 2327 * a precooked IEEE80211 header so no need for 2328 * normal processing 2329 */ 2330 skb_set_mac_header(skb, len_rthdr); 2331 /* 2332 * these are just fixed to the end of the rt area since we 2333 * don't have any better information and at this point, nobody cares 2334 */ 2335 skb_set_network_header(skb, len_rthdr); 2336 skb_set_transport_header(skb, len_rthdr); 2337 2338 if (skb->len < len_rthdr + 2) 2339 goto fail; 2340 2341 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2342 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2343 2344 if (skb->len < len_rthdr + hdrlen) 2345 goto fail; 2346 2347 /* 2348 * Initialize skb->protocol if the injected frame is a data frame 2349 * carrying a rfc1042 header 2350 */ 2351 if (ieee80211_is_data(hdr->frame_control) && 2352 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2353 u8 *payload = (u8 *)hdr + hdrlen; 2354 2355 if (ether_addr_equal(payload, rfc1042_header)) 2356 skb->protocol = cpu_to_be16((payload[6] << 8) | 2357 payload[7]); 2358 } 2359 2360 rcu_read_lock(); 2361 2362 /* 2363 * We process outgoing injected frames that have a local address 2364 * we handle as though they are non-injected frames. 2365 * This code here isn't entirely correct, the local MAC address 2366 * isn't always enough to find the interface to use; for proper 2367 * VLAN support we have an nl80211-based mechanism. 2368 * 2369 * This is necessary, for example, for old hostapd versions that 2370 * don't use nl80211-based management TX/RX. 2371 */ 2372 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2373 if (!ieee80211_sdata_running(tmp_sdata)) 2374 continue; 2375 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2376 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2377 continue; 2378 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2379 sdata = tmp_sdata; 2380 break; 2381 } 2382 } 2383 2384 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2385 if (!chanctx_conf) { 2386 tmp_sdata = rcu_dereference(local->monitor_sdata); 2387 if (tmp_sdata) 2388 chanctx_conf = 2389 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2390 } 2391 2392 if (chanctx_conf) 2393 chandef = &chanctx_conf->def; 2394 else 2395 goto fail_rcu; 2396 2397 /* 2398 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2399 * shouldn't transmit on disabled channels. 2400 */ 2401 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2402 IEEE80211_CHAN_DISABLED)) 2403 goto fail_rcu; 2404 2405 /* 2406 * Frame injection is not allowed if beaconing is not allowed 2407 * or if we need radar detection. Beaconing is usually not allowed when 2408 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2409 * Passive scan is also used in world regulatory domains where 2410 * your country is not known and as such it should be treated as 2411 * NO TX unless the channel is explicitly allowed in which case 2412 * your current regulatory domain would not have the passive scan 2413 * flag. 2414 * 2415 * Since AP mode uses monitor interfaces to inject/TX management 2416 * frames we can make AP mode the exception to this rule once it 2417 * supports radar detection as its implementation can deal with 2418 * radar detection by itself. We can do that later by adding a 2419 * monitor flag interfaces used for AP support. 2420 */ 2421 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2422 sdata->vif.type)) 2423 goto fail_rcu; 2424 2425 info->band = chandef->chan->band; 2426 2427 /* Initialize skb->priority according to frame type and TID class, 2428 * with respect to the sub interface that the frame will actually 2429 * be transmitted on. If the DONT_REORDER flag is set, the original 2430 * skb-priority is preserved to assure frames injected with this 2431 * flag are not reordered relative to each other. 2432 */ 2433 ieee80211_select_queue_80211(sdata, skb, hdr); 2434 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2435 2436 /* 2437 * Process the radiotap header. This will now take into account the 2438 * selected chandef above to accurately set injection rates and 2439 * retransmissions. 2440 */ 2441 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2442 goto fail_rcu; 2443 2444 /* remove the injection radiotap header */ 2445 skb_pull(skb, len_rthdr); 2446 2447 ieee80211_xmit(sdata, NULL, skb); 2448 rcu_read_unlock(); 2449 2450 return NETDEV_TX_OK; 2451 2452 fail_rcu: 2453 rcu_read_unlock(); 2454 fail: 2455 dev_kfree_skb(skb); 2456 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2457 } 2458 2459 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2460 { 2461 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2462 2463 return ethertype == ETH_P_TDLS && 2464 skb->len > 14 && 2465 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2466 } 2467 2468 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2469 struct sk_buff *skb, 2470 struct sta_info **sta_out) 2471 { 2472 struct sta_info *sta; 2473 2474 switch (sdata->vif.type) { 2475 case NL80211_IFTYPE_AP_VLAN: 2476 sta = rcu_dereference(sdata->u.vlan.sta); 2477 if (sta) { 2478 *sta_out = sta; 2479 return 0; 2480 } else if (sdata->wdev.use_4addr) { 2481 return -ENOLINK; 2482 } 2483 fallthrough; 2484 case NL80211_IFTYPE_AP: 2485 case NL80211_IFTYPE_OCB: 2486 case NL80211_IFTYPE_ADHOC: 2487 if (is_multicast_ether_addr(skb->data)) { 2488 *sta_out = ERR_PTR(-ENOENT); 2489 return 0; 2490 } 2491 sta = sta_info_get_bss(sdata, skb->data); 2492 break; 2493 #ifdef CONFIG_MAC80211_MESH 2494 case NL80211_IFTYPE_MESH_POINT: 2495 /* determined much later */ 2496 *sta_out = NULL; 2497 return 0; 2498 #endif 2499 case NL80211_IFTYPE_STATION: 2500 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2501 sta = sta_info_get(sdata, skb->data); 2502 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2503 if (test_sta_flag(sta, 2504 WLAN_STA_TDLS_PEER_AUTH)) { 2505 *sta_out = sta; 2506 return 0; 2507 } 2508 2509 /* 2510 * TDLS link during setup - throw out frames to 2511 * peer. Allow TDLS-setup frames to unauthorized 2512 * peers for the special case of a link teardown 2513 * after a TDLS sta is removed due to being 2514 * unreachable. 2515 */ 2516 if (!ieee80211_is_tdls_setup(skb)) 2517 return -EINVAL; 2518 } 2519 2520 } 2521 2522 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2523 if (!sta) 2524 return -ENOLINK; 2525 break; 2526 default: 2527 return -EINVAL; 2528 } 2529 2530 *sta_out = sta ?: ERR_PTR(-ENOENT); 2531 return 0; 2532 } 2533 2534 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2535 struct sk_buff *skb, 2536 u32 *info_flags, 2537 u64 *cookie) 2538 { 2539 struct sk_buff *ack_skb; 2540 u16 info_id = 0; 2541 2542 if (skb->sk) 2543 ack_skb = skb_clone_sk(skb); 2544 else 2545 ack_skb = skb_clone(skb, GFP_ATOMIC); 2546 2547 if (ack_skb) { 2548 unsigned long flags; 2549 int id; 2550 2551 spin_lock_irqsave(&local->ack_status_lock, flags); 2552 id = idr_alloc(&local->ack_status_frames, ack_skb, 2553 1, 0x2000, GFP_ATOMIC); 2554 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2555 2556 if (id >= 0) { 2557 info_id = id; 2558 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2559 if (cookie) { 2560 *cookie = ieee80211_mgmt_tx_cookie(local); 2561 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2562 } 2563 } else { 2564 kfree_skb(ack_skb); 2565 } 2566 } 2567 2568 return info_id; 2569 } 2570 2571 /** 2572 * ieee80211_build_hdr - build 802.11 header in the given frame 2573 * @sdata: virtual interface to build the header for 2574 * @skb: the skb to build the header in 2575 * @info_flags: skb flags to set 2576 * @sta: the station pointer 2577 * @ctrl_flags: info control flags to set 2578 * @cookie: cookie pointer to fill (if not %NULL) 2579 * 2580 * This function takes the skb with 802.3 header and reformats the header to 2581 * the appropriate IEEE 802.11 header based on which interface the packet is 2582 * being transmitted on. 2583 * 2584 * Note that this function also takes care of the TX status request and 2585 * potential unsharing of the SKB - this needs to be interleaved with the 2586 * header building. 2587 * 2588 * The function requires the read-side RCU lock held 2589 * 2590 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2591 */ 2592 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2593 struct sk_buff *skb, u32 info_flags, 2594 struct sta_info *sta, u32 ctrl_flags, 2595 u64 *cookie) 2596 { 2597 struct ieee80211_local *local = sdata->local; 2598 struct ieee80211_tx_info *info; 2599 int head_need; 2600 u16 ethertype, hdrlen, meshhdrlen = 0; 2601 __le16 fc; 2602 struct ieee80211_hdr hdr; 2603 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2604 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2605 const u8 *encaps_data; 2606 int encaps_len, skip_header_bytes; 2607 bool wme_sta = false, authorized = false; 2608 bool tdls_peer; 2609 bool multicast; 2610 u16 info_id = 0; 2611 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2612 enum nl80211_band band; 2613 int ret; 2614 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2615 2616 if (IS_ERR(sta)) 2617 sta = NULL; 2618 2619 #ifdef CONFIG_MAC80211_DEBUGFS 2620 if (local->force_tx_status) 2621 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2622 #endif 2623 2624 /* convert Ethernet header to proper 802.11 header (based on 2625 * operation mode) */ 2626 ethertype = (skb->data[12] << 8) | skb->data[13]; 2627 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2628 2629 if (!ieee80211_vif_is_mld(&sdata->vif)) 2630 chanctx_conf = 2631 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2632 2633 switch (sdata->vif.type) { 2634 case NL80211_IFTYPE_AP_VLAN: 2635 if (sdata->wdev.use_4addr) { 2636 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2637 /* RA TA DA SA */ 2638 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2639 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2640 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2641 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2642 hdrlen = 30; 2643 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2644 wme_sta = sta->sta.wme; 2645 } 2646 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2647 struct ieee80211_sub_if_data *ap_sdata; 2648 2649 /* override chanctx_conf from AP (we don't have one) */ 2650 ap_sdata = container_of(sdata->bss, 2651 struct ieee80211_sub_if_data, 2652 u.ap); 2653 chanctx_conf = 2654 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2655 } 2656 if (sdata->wdev.use_4addr) 2657 break; 2658 fallthrough; 2659 case NL80211_IFTYPE_AP: 2660 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2661 /* DA BSSID SA */ 2662 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2663 2664 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2665 struct ieee80211_link_data *link; 2666 2667 link_id = sta->deflink.link_id; 2668 link = rcu_dereference(sdata->link[link_id]); 2669 if (WARN_ON(!link)) { 2670 ret = -ENOLINK; 2671 goto free; 2672 } 2673 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2674 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2675 (sta && sta->sta.mlo)) { 2676 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2677 } else { 2678 struct ieee80211_bss_conf *conf; 2679 2680 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2681 if (unlikely(!conf)) { 2682 ret = -ENOLINK; 2683 goto free; 2684 } 2685 2686 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2687 } 2688 2689 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2690 hdrlen = 24; 2691 break; 2692 #ifdef CONFIG_MAC80211_MESH 2693 case NL80211_IFTYPE_MESH_POINT: 2694 if (!is_multicast_ether_addr(skb->data)) { 2695 struct sta_info *next_hop; 2696 bool mpp_lookup = true; 2697 2698 mpath = mesh_path_lookup(sdata, skb->data); 2699 if (mpath) { 2700 mpp_lookup = false; 2701 next_hop = rcu_dereference(mpath->next_hop); 2702 if (!next_hop || 2703 !(mpath->flags & (MESH_PATH_ACTIVE | 2704 MESH_PATH_RESOLVING))) 2705 mpp_lookup = true; 2706 } 2707 2708 if (mpp_lookup) { 2709 mppath = mpp_path_lookup(sdata, skb->data); 2710 if (mppath) 2711 mppath->exp_time = jiffies; 2712 } 2713 2714 if (mppath && mpath) 2715 mesh_path_del(sdata, mpath->dst); 2716 } 2717 2718 /* 2719 * Use address extension if it is a packet from 2720 * another interface or if we know the destination 2721 * is being proxied by a portal (i.e. portal address 2722 * differs from proxied address) 2723 */ 2724 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2725 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2726 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2727 skb->data, skb->data + ETH_ALEN); 2728 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2729 NULL, NULL); 2730 } else { 2731 /* DS -> MBSS (802.11-2012 13.11.3.3). 2732 * For unicast with unknown forwarding information, 2733 * destination might be in the MBSS or if that fails 2734 * forwarded to another mesh gate. In either case 2735 * resolution will be handled in ieee80211_xmit(), so 2736 * leave the original DA. This also works for mcast */ 2737 const u8 *mesh_da = skb->data; 2738 2739 if (mppath) 2740 mesh_da = mppath->mpp; 2741 else if (mpath) 2742 mesh_da = mpath->dst; 2743 2744 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2745 mesh_da, sdata->vif.addr); 2746 if (is_multicast_ether_addr(mesh_da)) 2747 /* DA TA mSA AE:SA */ 2748 meshhdrlen = ieee80211_new_mesh_header( 2749 sdata, &mesh_hdr, 2750 skb->data + ETH_ALEN, NULL); 2751 else 2752 /* RA TA mDA mSA AE:DA SA */ 2753 meshhdrlen = ieee80211_new_mesh_header( 2754 sdata, &mesh_hdr, skb->data, 2755 skb->data + ETH_ALEN); 2756 2757 } 2758 2759 /* For injected frames, fill RA right away as nexthop lookup 2760 * will be skipped. 2761 */ 2762 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2763 is_zero_ether_addr(hdr.addr1)) 2764 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2765 break; 2766 #endif 2767 case NL80211_IFTYPE_STATION: 2768 /* we already did checks when looking up the RA STA */ 2769 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2770 2771 if (tdls_peer) { 2772 /* For TDLS only one link can be valid with peer STA */ 2773 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2774 struct ieee80211_link_data *link; 2775 2776 /* DA SA BSSID */ 2777 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2778 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2779 link = rcu_dereference(sdata->link[tdls_link_id]); 2780 if (WARN_ON_ONCE(!link)) { 2781 ret = -EINVAL; 2782 goto free; 2783 } 2784 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2785 hdrlen = 24; 2786 } else if (sdata->u.mgd.use_4addr && 2787 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2788 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2789 IEEE80211_FCTL_TODS); 2790 /* RA TA DA SA */ 2791 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2792 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2793 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2794 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2795 hdrlen = 30; 2796 } else { 2797 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2798 /* BSSID SA DA */ 2799 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2800 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2801 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2802 hdrlen = 24; 2803 } 2804 break; 2805 case NL80211_IFTYPE_OCB: 2806 /* DA SA BSSID */ 2807 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2808 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2809 eth_broadcast_addr(hdr.addr3); 2810 hdrlen = 24; 2811 break; 2812 case NL80211_IFTYPE_ADHOC: 2813 /* DA SA BSSID */ 2814 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2815 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2816 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2817 hdrlen = 24; 2818 break; 2819 default: 2820 ret = -EINVAL; 2821 goto free; 2822 } 2823 2824 if (!chanctx_conf) { 2825 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2826 ret = -ENOTCONN; 2827 goto free; 2828 } 2829 /* MLD transmissions must not rely on the band */ 2830 band = 0; 2831 } else { 2832 band = chanctx_conf->def.chan->band; 2833 } 2834 2835 multicast = is_multicast_ether_addr(hdr.addr1); 2836 2837 /* sta is always NULL for mesh */ 2838 if (sta) { 2839 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2840 wme_sta = sta->sta.wme; 2841 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2842 /* For mesh, the use of the QoS header is mandatory */ 2843 wme_sta = true; 2844 } 2845 2846 /* receiver does QoS (which also means we do) use it */ 2847 if (wme_sta) { 2848 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2849 hdrlen += 2; 2850 } 2851 2852 /* 2853 * Drop unicast frames to unauthorised stations unless they are 2854 * EAPOL frames from the local station. 2855 */ 2856 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2857 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2858 !multicast && !authorized && 2859 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2860 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2861 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2862 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2863 sdata->name, hdr.addr1); 2864 #endif 2865 2866 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2867 2868 ret = -EPERM; 2869 goto free; 2870 } 2871 2872 if (unlikely(!multicast && 2873 (sk_requests_wifi_status(skb->sk) || 2874 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2875 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2876 cookie); 2877 2878 /* 2879 * If the skb is shared we need to obtain our own copy. 2880 */ 2881 skb = skb_share_check(skb, GFP_ATOMIC); 2882 if (unlikely(!skb)) { 2883 ret = -ENOMEM; 2884 goto free; 2885 } 2886 2887 hdr.frame_control = fc; 2888 hdr.duration_id = 0; 2889 hdr.seq_ctrl = 0; 2890 2891 skip_header_bytes = ETH_HLEN; 2892 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2893 encaps_data = bridge_tunnel_header; 2894 encaps_len = sizeof(bridge_tunnel_header); 2895 skip_header_bytes -= 2; 2896 } else if (ethertype >= ETH_P_802_3_MIN) { 2897 encaps_data = rfc1042_header; 2898 encaps_len = sizeof(rfc1042_header); 2899 skip_header_bytes -= 2; 2900 } else { 2901 encaps_data = NULL; 2902 encaps_len = 0; 2903 } 2904 2905 skb_pull(skb, skip_header_bytes); 2906 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2907 2908 /* 2909 * So we need to modify the skb header and hence need a copy of 2910 * that. The head_need variable above doesn't, so far, include 2911 * the needed header space that we don't need right away. If we 2912 * can, then we don't reallocate right now but only after the 2913 * frame arrives at the master device (if it does...) 2914 * 2915 * If we cannot, however, then we will reallocate to include all 2916 * the ever needed space. Also, if we need to reallocate it anyway, 2917 * make it big enough for everything we may ever need. 2918 */ 2919 2920 if (head_need > 0 || skb_cloned(skb)) { 2921 head_need += IEEE80211_ENCRYPT_HEADROOM; 2922 head_need += local->tx_headroom; 2923 head_need = max_t(int, 0, head_need); 2924 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2925 ieee80211_free_txskb(&local->hw, skb); 2926 skb = NULL; 2927 return ERR_PTR(-ENOMEM); 2928 } 2929 } 2930 2931 if (encaps_data) 2932 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2933 2934 #ifdef CONFIG_MAC80211_MESH 2935 if (meshhdrlen > 0) 2936 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2937 #endif 2938 2939 if (ieee80211_is_data_qos(fc)) { 2940 __le16 *qos_control; 2941 2942 qos_control = skb_push(skb, 2); 2943 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2944 /* 2945 * Maybe we could actually set some fields here, for now just 2946 * initialise to zero to indicate no special operation. 2947 */ 2948 *qos_control = 0; 2949 } else 2950 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2951 2952 skb_reset_mac_header(skb); 2953 2954 info = IEEE80211_SKB_CB(skb); 2955 memset(info, 0, sizeof(*info)); 2956 2957 info->flags = info_flags; 2958 if (info_id) { 2959 info->status_data = info_id; 2960 info->status_data_idr = 1; 2961 } 2962 info->band = band; 2963 2964 if (likely(!cookie)) { 2965 ctrl_flags |= u32_encode_bits(link_id, 2966 IEEE80211_TX_CTRL_MLO_LINK); 2967 } else { 2968 unsigned int pre_conf_link_id; 2969 2970 /* 2971 * ctrl_flags already have been set by 2972 * ieee80211_tx_control_port(), here 2973 * we just sanity check that 2974 */ 2975 2976 pre_conf_link_id = u32_get_bits(ctrl_flags, 2977 IEEE80211_TX_CTRL_MLO_LINK); 2978 2979 if (pre_conf_link_id != link_id && 2980 link_id != IEEE80211_LINK_UNSPECIFIED) { 2981 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2982 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2983 sdata->name, hdr.addr1, 2984 pre_conf_link_id, link_id); 2985 #endif 2986 ret = -EINVAL; 2987 goto free; 2988 } 2989 } 2990 2991 info->control.flags = ctrl_flags; 2992 2993 return skb; 2994 free: 2995 kfree_skb(skb); 2996 return ERR_PTR(ret); 2997 } 2998 2999 /* 3000 * fast-xmit overview 3001 * 3002 * The core idea of this fast-xmit is to remove per-packet checks by checking 3003 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3004 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3005 * much less work can be done per packet. For example, fragmentation must be 3006 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3007 * in the code here. 3008 * 3009 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3010 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3011 * 3012 * The most difficult part of this is that when any of these assumptions 3013 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3014 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3015 * since the per-packet code no longer checks the conditions. This is reflected 3016 * by the calls to these functions throughout the rest of the code, and must be 3017 * maintained if any of the TX path checks change. 3018 */ 3019 3020 void ieee80211_check_fast_xmit(struct sta_info *sta) 3021 { 3022 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3023 struct ieee80211_local *local = sta->local; 3024 struct ieee80211_sub_if_data *sdata = sta->sdata; 3025 struct ieee80211_hdr *hdr = (void *)build.hdr; 3026 struct ieee80211_chanctx_conf *chanctx_conf; 3027 __le16 fc; 3028 3029 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3030 return; 3031 3032 if (ieee80211_vif_is_mesh(&sdata->vif)) 3033 mesh_fast_tx_flush_sta(sdata, sta); 3034 3035 /* Locking here protects both the pointer itself, and against concurrent 3036 * invocations winning data access races to, e.g., the key pointer that 3037 * is used. 3038 * Without it, the invocation of this function right after the key 3039 * pointer changes wouldn't be sufficient, as another CPU could access 3040 * the pointer, then stall, and then do the cache update after the CPU 3041 * that invalidated the key. 3042 * With the locking, such scenarios cannot happen as the check for the 3043 * key and the fast-tx assignment are done atomically, so the CPU that 3044 * modifies the key will either wait or other one will see the key 3045 * cleared/changed already. 3046 */ 3047 spin_lock_bh(&sta->lock); 3048 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3049 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3050 sdata->vif.type == NL80211_IFTYPE_STATION) 3051 goto out; 3052 3053 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3054 goto out; 3055 3056 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3057 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3058 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3059 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3060 goto out; 3061 3062 if (sdata->noack_map) 3063 goto out; 3064 3065 /* fast-xmit doesn't handle fragmentation at all */ 3066 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3067 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3068 goto out; 3069 3070 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3071 rcu_read_lock(); 3072 chanctx_conf = 3073 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3074 if (!chanctx_conf) { 3075 rcu_read_unlock(); 3076 goto out; 3077 } 3078 build.band = chanctx_conf->def.chan->band; 3079 rcu_read_unlock(); 3080 } else { 3081 /* MLD transmissions must not rely on the band */ 3082 build.band = 0; 3083 } 3084 3085 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3086 3087 switch (sdata->vif.type) { 3088 case NL80211_IFTYPE_ADHOC: 3089 /* DA SA BSSID */ 3090 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3091 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3092 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3093 build.hdr_len = 24; 3094 break; 3095 case NL80211_IFTYPE_STATION: 3096 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3097 /* For TDLS only one link can be valid with peer STA */ 3098 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3099 struct ieee80211_link_data *link; 3100 3101 /* DA SA BSSID */ 3102 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3103 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3104 rcu_read_lock(); 3105 link = rcu_dereference(sdata->link[tdls_link_id]); 3106 if (!WARN_ON_ONCE(!link)) 3107 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3108 rcu_read_unlock(); 3109 build.hdr_len = 24; 3110 break; 3111 } 3112 3113 if (sdata->u.mgd.use_4addr) { 3114 /* non-regular ethertype cannot use the fastpath */ 3115 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3116 IEEE80211_FCTL_TODS); 3117 /* RA TA DA SA */ 3118 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3119 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3120 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3121 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3122 build.hdr_len = 30; 3123 break; 3124 } 3125 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3126 /* BSSID SA DA */ 3127 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3128 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3129 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3130 build.hdr_len = 24; 3131 break; 3132 case NL80211_IFTYPE_AP_VLAN: 3133 if (sdata->wdev.use_4addr) { 3134 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3135 IEEE80211_FCTL_TODS); 3136 /* RA TA DA SA */ 3137 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3138 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3139 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3140 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3141 build.hdr_len = 30; 3142 break; 3143 } 3144 fallthrough; 3145 case NL80211_IFTYPE_AP: 3146 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3147 /* DA BSSID SA */ 3148 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3149 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3150 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3151 } else { 3152 unsigned int link_id = sta->deflink.link_id; 3153 struct ieee80211_link_data *link; 3154 3155 rcu_read_lock(); 3156 link = rcu_dereference(sdata->link[link_id]); 3157 if (WARN_ON(!link)) { 3158 rcu_read_unlock(); 3159 goto out; 3160 } 3161 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3162 rcu_read_unlock(); 3163 } 3164 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3165 build.hdr_len = 24; 3166 break; 3167 default: 3168 /* not handled on fast-xmit */ 3169 goto out; 3170 } 3171 3172 if (sta->sta.wme) { 3173 build.hdr_len += 2; 3174 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3175 } 3176 3177 /* We store the key here so there's no point in using rcu_dereference() 3178 * but that's fine because the code that changes the pointers will call 3179 * this function after doing so. For a single CPU that would be enough, 3180 * for multiple see the comment above. 3181 */ 3182 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3183 if (!build.key) 3184 build.key = rcu_access_pointer(sdata->default_unicast_key); 3185 if (build.key) { 3186 bool gen_iv, iv_spc, mmic; 3187 3188 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3189 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3190 mmic = build.key->conf.flags & 3191 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3192 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3193 3194 /* don't handle software crypto */ 3195 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3196 goto out; 3197 3198 /* Key is being removed */ 3199 if (build.key->flags & KEY_FLAG_TAINTED) 3200 goto out; 3201 3202 switch (build.key->conf.cipher) { 3203 case WLAN_CIPHER_SUITE_CCMP: 3204 case WLAN_CIPHER_SUITE_CCMP_256: 3205 if (gen_iv) 3206 build.pn_offs = build.hdr_len; 3207 if (gen_iv || iv_spc) 3208 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3209 break; 3210 case WLAN_CIPHER_SUITE_GCMP: 3211 case WLAN_CIPHER_SUITE_GCMP_256: 3212 if (gen_iv) 3213 build.pn_offs = build.hdr_len; 3214 if (gen_iv || iv_spc) 3215 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3216 break; 3217 case WLAN_CIPHER_SUITE_TKIP: 3218 /* cannot handle MMIC or IV generation in xmit-fast */ 3219 if (mmic || gen_iv) 3220 goto out; 3221 if (iv_spc) 3222 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3223 break; 3224 case WLAN_CIPHER_SUITE_WEP40: 3225 case WLAN_CIPHER_SUITE_WEP104: 3226 /* cannot handle IV generation in fast-xmit */ 3227 if (gen_iv) 3228 goto out; 3229 if (iv_spc) 3230 build.hdr_len += IEEE80211_WEP_IV_LEN; 3231 break; 3232 case WLAN_CIPHER_SUITE_AES_CMAC: 3233 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3234 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3235 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3236 WARN(1, 3237 "management cipher suite 0x%x enabled for data\n", 3238 build.key->conf.cipher); 3239 goto out; 3240 default: 3241 /* we don't know how to generate IVs for this at all */ 3242 if (WARN_ON(gen_iv)) 3243 goto out; 3244 } 3245 3246 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3247 } 3248 3249 hdr->frame_control = fc; 3250 3251 memcpy(build.hdr + build.hdr_len, 3252 rfc1042_header, sizeof(rfc1042_header)); 3253 build.hdr_len += sizeof(rfc1042_header); 3254 3255 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3256 /* if the kmemdup fails, continue w/o fast_tx */ 3257 3258 out: 3259 /* we might have raced against another call to this function */ 3260 old = rcu_dereference_protected(sta->fast_tx, 3261 lockdep_is_held(&sta->lock)); 3262 rcu_assign_pointer(sta->fast_tx, fast_tx); 3263 if (old) 3264 kfree_rcu(old, rcu_head); 3265 spin_unlock_bh(&sta->lock); 3266 } 3267 3268 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3269 { 3270 struct sta_info *sta; 3271 3272 rcu_read_lock(); 3273 list_for_each_entry_rcu(sta, &local->sta_list, list) 3274 ieee80211_check_fast_xmit(sta); 3275 rcu_read_unlock(); 3276 } 3277 3278 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3279 { 3280 struct ieee80211_local *local = sdata->local; 3281 struct sta_info *sta; 3282 3283 rcu_read_lock(); 3284 3285 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3286 if (sdata != sta->sdata && 3287 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3288 continue; 3289 ieee80211_check_fast_xmit(sta); 3290 } 3291 3292 rcu_read_unlock(); 3293 } 3294 3295 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3296 { 3297 struct ieee80211_fast_tx *fast_tx; 3298 3299 spin_lock_bh(&sta->lock); 3300 fast_tx = rcu_dereference_protected(sta->fast_tx, 3301 lockdep_is_held(&sta->lock)); 3302 RCU_INIT_POINTER(sta->fast_tx, NULL); 3303 spin_unlock_bh(&sta->lock); 3304 3305 if (fast_tx) 3306 kfree_rcu(fast_tx, rcu_head); 3307 } 3308 3309 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3310 struct sk_buff *skb, int headroom) 3311 { 3312 if (skb_headroom(skb) < headroom) { 3313 I802_DEBUG_INC(local->tx_expand_skb_head); 3314 3315 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3316 wiphy_debug(local->hw.wiphy, 3317 "failed to reallocate TX buffer\n"); 3318 return false; 3319 } 3320 } 3321 3322 return true; 3323 } 3324 3325 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3326 struct ieee80211_fast_tx *fast_tx, 3327 struct sk_buff *skb) 3328 { 3329 struct ieee80211_local *local = sdata->local; 3330 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3331 struct ieee80211_hdr *hdr; 3332 struct ethhdr *amsdu_hdr; 3333 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3334 int subframe_len = skb->len - hdr_len; 3335 void *data; 3336 u8 *qc, *h_80211_src, *h_80211_dst; 3337 const u8 *bssid; 3338 3339 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3340 return false; 3341 3342 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3343 return true; 3344 3345 if (!ieee80211_amsdu_realloc_pad(local, skb, 3346 sizeof(*amsdu_hdr) + 3347 local->hw.extra_tx_headroom)) 3348 return false; 3349 3350 data = skb_push(skb, sizeof(*amsdu_hdr)); 3351 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3352 hdr = data; 3353 amsdu_hdr = data + hdr_len; 3354 /* h_80211_src/dst is addr* field within hdr */ 3355 h_80211_src = data + fast_tx->sa_offs; 3356 h_80211_dst = data + fast_tx->da_offs; 3357 3358 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3359 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3360 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3361 3362 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3363 * fields needs to be changed to BSSID for A-MSDU frames depending 3364 * on FromDS/ToDS values. 3365 */ 3366 switch (sdata->vif.type) { 3367 case NL80211_IFTYPE_STATION: 3368 bssid = sdata->vif.cfg.ap_addr; 3369 break; 3370 case NL80211_IFTYPE_AP: 3371 case NL80211_IFTYPE_AP_VLAN: 3372 bssid = sdata->vif.addr; 3373 break; 3374 default: 3375 bssid = NULL; 3376 } 3377 3378 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3379 ether_addr_copy(h_80211_src, bssid); 3380 3381 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3382 ether_addr_copy(h_80211_dst, bssid); 3383 3384 qc = ieee80211_get_qos_ctl(hdr); 3385 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3386 3387 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3388 3389 return true; 3390 } 3391 3392 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3393 struct sta_info *sta, 3394 struct ieee80211_fast_tx *fast_tx, 3395 struct sk_buff *skb, 3396 const u8 *da, const u8 *sa) 3397 { 3398 struct ieee80211_local *local = sdata->local; 3399 struct fq *fq = &local->fq; 3400 struct fq_tin *tin; 3401 struct fq_flow *flow; 3402 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3403 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3404 struct txq_info *txqi; 3405 struct sk_buff **frag_tail, *head; 3406 int subframe_len = skb->len - ETH_ALEN; 3407 u8 max_subframes = sta->sta.max_amsdu_subframes; 3408 int max_frags = local->hw.max_tx_fragments; 3409 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3410 int orig_truesize; 3411 u32 flow_idx; 3412 __be16 len; 3413 void *data; 3414 bool ret = false; 3415 unsigned int orig_len; 3416 int n = 2, nfrags, pad = 0; 3417 u16 hdrlen; 3418 3419 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3420 return false; 3421 3422 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3423 return false; 3424 3425 if (ieee80211_vif_is_mesh(&sdata->vif)) 3426 return false; 3427 3428 if (skb_is_gso(skb)) 3429 return false; 3430 3431 if (!txq) 3432 return false; 3433 3434 txqi = to_txq_info(txq); 3435 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3436 return false; 3437 3438 if (sta->sta.cur->max_rc_amsdu_len) 3439 max_amsdu_len = min_t(int, max_amsdu_len, 3440 sta->sta.cur->max_rc_amsdu_len); 3441 3442 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3443 max_amsdu_len = min_t(int, max_amsdu_len, 3444 sta->sta.cur->max_tid_amsdu_len[tid]); 3445 3446 flow_idx = fq_flow_idx(fq, skb); 3447 3448 spin_lock_bh(&fq->lock); 3449 3450 /* TODO: Ideally aggregation should be done on dequeue to remain 3451 * responsive to environment changes. 3452 */ 3453 3454 tin = &txqi->tin; 3455 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3456 head = skb_peek_tail(&flow->queue); 3457 if (!head || skb_is_gso(head)) 3458 goto out; 3459 3460 orig_truesize = head->truesize; 3461 orig_len = head->len; 3462 3463 if (skb->len + head->len > max_amsdu_len) 3464 goto out; 3465 3466 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3467 nfrags += 1 + skb_shinfo(head)->nr_frags; 3468 frag_tail = &skb_shinfo(head)->frag_list; 3469 while (*frag_tail) { 3470 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3471 frag_tail = &(*frag_tail)->next; 3472 n++; 3473 } 3474 3475 if (max_subframes && n > max_subframes) 3476 goto out; 3477 3478 if (max_frags && nfrags > max_frags) 3479 goto out; 3480 3481 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3482 goto out; 3483 3484 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3485 goto out; 3486 3487 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3488 * and frag_tail should be &skb_shinfo(head)->frag_list. 3489 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3490 * Reload frag_tail to have it pointing to the correct place. 3491 */ 3492 if (n == 2) 3493 frag_tail = &skb_shinfo(head)->frag_list; 3494 3495 /* 3496 * Pad out the previous subframe to a multiple of 4 by adding the 3497 * padding to the next one, that's being added. Note that head->len 3498 * is the length of the full A-MSDU, but that works since each time 3499 * we add a new subframe we pad out the previous one to a multiple 3500 * of 4 and thus it no longer matters in the next round. 3501 */ 3502 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3503 if ((head->len - hdrlen) & 3) 3504 pad = 4 - ((head->len - hdrlen) & 3); 3505 3506 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3507 2 + pad)) 3508 goto out_recalc; 3509 3510 ret = true; 3511 data = skb_push(skb, ETH_ALEN + 2); 3512 ether_addr_copy(data, da); 3513 ether_addr_copy(data + ETH_ALEN, sa); 3514 3515 data += 2 * ETH_ALEN; 3516 len = cpu_to_be16(subframe_len); 3517 memcpy(data, &len, 2); 3518 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3519 3520 memset(skb_push(skb, pad), 0, pad); 3521 3522 head->len += skb->len; 3523 head->data_len += skb->len; 3524 *frag_tail = skb; 3525 3526 out_recalc: 3527 fq->memory_usage += head->truesize - orig_truesize; 3528 if (head->len != orig_len) { 3529 flow->backlog += head->len - orig_len; 3530 tin->backlog_bytes += head->len - orig_len; 3531 } 3532 out: 3533 spin_unlock_bh(&fq->lock); 3534 3535 return ret; 3536 } 3537 3538 /* 3539 * Can be called while the sta lock is held. Anything that can cause packets to 3540 * be generated will cause deadlock! 3541 */ 3542 static ieee80211_tx_result 3543 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3544 struct sta_info *sta, u8 pn_offs, 3545 struct ieee80211_key *key, 3546 struct ieee80211_tx_data *tx) 3547 { 3548 struct sk_buff *skb = tx->skb; 3549 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3550 struct ieee80211_hdr *hdr = (void *)skb->data; 3551 u8 tid = IEEE80211_NUM_TIDS; 3552 3553 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3554 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3555 return TX_DROP; 3556 3557 if (key) 3558 info->control.hw_key = &key->conf; 3559 3560 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3561 3562 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3563 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3564 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3565 } else { 3566 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3567 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3568 sdata->sequence_number += 0x10; 3569 } 3570 3571 if (skb_shinfo(skb)->gso_size) 3572 sta->deflink.tx_stats.msdu[tid] += 3573 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3574 else 3575 sta->deflink.tx_stats.msdu[tid]++; 3576 3577 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3578 3579 /* statistics normally done by ieee80211_tx_h_stats (but that 3580 * has to consider fragmentation, so is more complex) 3581 */ 3582 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3583 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3584 3585 if (pn_offs) { 3586 u64 pn; 3587 u8 *crypto_hdr = skb->data + pn_offs; 3588 3589 switch (key->conf.cipher) { 3590 case WLAN_CIPHER_SUITE_CCMP: 3591 case WLAN_CIPHER_SUITE_CCMP_256: 3592 case WLAN_CIPHER_SUITE_GCMP: 3593 case WLAN_CIPHER_SUITE_GCMP_256: 3594 pn = atomic64_inc_return(&key->conf.tx_pn); 3595 crypto_hdr[0] = pn; 3596 crypto_hdr[1] = pn >> 8; 3597 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3598 crypto_hdr[4] = pn >> 16; 3599 crypto_hdr[5] = pn >> 24; 3600 crypto_hdr[6] = pn >> 32; 3601 crypto_hdr[7] = pn >> 40; 3602 break; 3603 } 3604 } 3605 3606 return TX_CONTINUE; 3607 } 3608 3609 static netdev_features_t 3610 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3611 { 3612 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3613 return sdata->vif.netdev_features; 3614 3615 if (!sdata->bss) 3616 return 0; 3617 3618 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3619 return sdata->vif.netdev_features; 3620 } 3621 3622 static struct sk_buff * 3623 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3624 { 3625 if (skb_is_gso(skb)) { 3626 struct sk_buff *segs; 3627 3628 segs = skb_gso_segment(skb, features); 3629 if (!segs) 3630 return skb; 3631 if (IS_ERR(segs)) 3632 goto free; 3633 3634 consume_skb(skb); 3635 return segs; 3636 } 3637 3638 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3639 goto free; 3640 3641 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3642 int ofs = skb_checksum_start_offset(skb); 3643 3644 if (skb->encapsulation) 3645 skb_set_inner_transport_header(skb, ofs); 3646 else 3647 skb_set_transport_header(skb, ofs); 3648 3649 if (skb_csum_hwoffload_help(skb, features)) 3650 goto free; 3651 } 3652 3653 skb_mark_not_on_list(skb); 3654 return skb; 3655 3656 free: 3657 kfree_skb(skb); 3658 return NULL; 3659 } 3660 3661 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3662 struct sta_info *sta, 3663 struct ieee80211_fast_tx *fast_tx, 3664 struct sk_buff *skb, bool ampdu, 3665 const u8 *da, const u8 *sa) 3666 { 3667 struct ieee80211_local *local = sdata->local; 3668 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3669 struct ieee80211_tx_info *info; 3670 struct ieee80211_tx_data tx; 3671 ieee80211_tx_result r; 3672 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3673 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3674 3675 skb = skb_share_check(skb, GFP_ATOMIC); 3676 if (unlikely(!skb)) 3677 return; 3678 3679 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3680 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3681 return; 3682 3683 /* will not be crypto-handled beyond what we do here, so use false 3684 * as the may-encrypt argument for the resize to not account for 3685 * more room than we already have in 'extra_head' 3686 */ 3687 if (unlikely(ieee80211_skb_resize(sdata, skb, 3688 max_t(int, extra_head + hw_headroom - 3689 skb_headroom(skb), 0), 3690 ENCRYPT_NO))) 3691 goto free; 3692 3693 hdr = skb_push(skb, extra_head); 3694 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3695 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3696 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3697 3698 info = IEEE80211_SKB_CB(skb); 3699 memset(info, 0, sizeof(*info)); 3700 info->band = fast_tx->band; 3701 info->control.vif = &sdata->vif; 3702 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3703 IEEE80211_TX_CTL_DONTFRAG; 3704 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3705 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3706 IEEE80211_TX_CTRL_MLO_LINK); 3707 3708 #ifdef CONFIG_MAC80211_DEBUGFS 3709 if (local->force_tx_status) 3710 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3711 #endif 3712 3713 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3714 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3715 3716 *ieee80211_get_qos_ctl(hdr) = tid; 3717 } 3718 3719 __skb_queue_head_init(&tx.skbs); 3720 3721 tx.flags = IEEE80211_TX_UNICAST; 3722 tx.local = local; 3723 tx.sdata = sdata; 3724 tx.sta = sta; 3725 tx.key = fast_tx->key; 3726 3727 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3728 return; 3729 3730 tx.skb = skb; 3731 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3732 fast_tx->key, &tx); 3733 tx.skb = NULL; 3734 if (r == TX_DROP) { 3735 tx.sdata->tx_handlers_drop++; 3736 goto free; 3737 } 3738 3739 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3740 sdata = container_of(sdata->bss, 3741 struct ieee80211_sub_if_data, u.ap); 3742 3743 __skb_queue_tail(&tx.skbs, skb); 3744 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3745 return; 3746 3747 free: 3748 kfree_skb(skb); 3749 } 3750 3751 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3752 struct sta_info *sta, 3753 struct ieee80211_fast_tx *fast_tx, 3754 struct sk_buff *skb) 3755 { 3756 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3757 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3758 struct tid_ampdu_tx *tid_tx = NULL; 3759 struct sk_buff *next; 3760 struct ethhdr eth; 3761 u8 tid = IEEE80211_NUM_TIDS; 3762 3763 /* control port protocol needs a lot of special handling */ 3764 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3765 return false; 3766 3767 /* only RFC 1042 SNAP */ 3768 if (ethertype < ETH_P_802_3_MIN) 3769 return false; 3770 3771 /* don't handle TX status request here either */ 3772 if (sk_requests_wifi_status(skb->sk)) 3773 return false; 3774 3775 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3776 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3777 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3778 if (tid_tx) { 3779 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3780 return false; 3781 if (tid_tx->timeout) 3782 tid_tx->last_tx = jiffies; 3783 } 3784 } 3785 3786 memcpy(ð, skb->data, ETH_HLEN - 2); 3787 3788 /* after this point (skb is modified) we cannot return false */ 3789 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3790 if (!skb) 3791 return true; 3792 3793 skb_list_walk_safe(skb, skb, next) { 3794 skb_mark_not_on_list(skb); 3795 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3796 eth.h_dest, eth.h_source); 3797 } 3798 3799 return true; 3800 } 3801 3802 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3803 struct ieee80211_txq *txq) 3804 { 3805 struct ieee80211_local *local = hw_to_local(hw); 3806 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3807 struct ieee80211_hdr *hdr; 3808 struct sk_buff *skb = NULL; 3809 struct fq *fq = &local->fq; 3810 struct fq_tin *tin = &txqi->tin; 3811 struct ieee80211_tx_info *info; 3812 struct ieee80211_tx_data tx; 3813 ieee80211_tx_result r; 3814 struct ieee80211_vif *vif = txq->vif; 3815 int q = vif->hw_queue[txq->ac]; 3816 unsigned long flags; 3817 bool q_stopped; 3818 3819 WARN_ON_ONCE(softirq_count() == 0); 3820 3821 if (!ieee80211_txq_airtime_check(hw, txq)) 3822 return NULL; 3823 3824 begin: 3825 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3826 q_stopped = local->queue_stop_reasons[q]; 3827 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3828 3829 if (unlikely(q_stopped)) { 3830 /* mark for waking later */ 3831 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3832 return NULL; 3833 } 3834 3835 spin_lock_bh(&fq->lock); 3836 3837 /* Make sure fragments stay together. */ 3838 skb = __skb_dequeue(&txqi->frags); 3839 if (unlikely(skb)) { 3840 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3841 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3842 goto out; 3843 IEEE80211_SKB_CB(skb)->control.flags &= 3844 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3845 } else { 3846 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3847 goto out; 3848 3849 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3850 } 3851 3852 if (!skb) 3853 goto out; 3854 3855 spin_unlock_bh(&fq->lock); 3856 3857 hdr = (struct ieee80211_hdr *)skb->data; 3858 info = IEEE80211_SKB_CB(skb); 3859 3860 memset(&tx, 0, sizeof(tx)); 3861 __skb_queue_head_init(&tx.skbs); 3862 tx.local = local; 3863 tx.skb = skb; 3864 tx.sdata = vif_to_sdata(info->control.vif); 3865 3866 if (txq->sta) { 3867 tx.sta = container_of(txq->sta, struct sta_info, sta); 3868 /* 3869 * Drop unicast frames to unauthorised stations unless they are 3870 * injected frames or EAPOL frames from the local station. 3871 */ 3872 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3873 ieee80211_is_data(hdr->frame_control) && 3874 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3875 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3876 !is_multicast_ether_addr(hdr->addr1) && 3877 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3878 (!(info->control.flags & 3879 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3880 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3881 NULL)))) { 3882 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3883 ieee80211_free_txskb(&local->hw, skb); 3884 goto begin; 3885 } 3886 } 3887 3888 /* 3889 * The key can be removed while the packet was queued, so need to call 3890 * this here to get the current key. 3891 */ 3892 info->control.hw_key = NULL; 3893 r = ieee80211_tx_h_select_key(&tx); 3894 if (r != TX_CONTINUE) { 3895 ieee80211_free_txskb(&local->hw, skb); 3896 goto begin; 3897 } 3898 3899 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3900 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3901 IEEE80211_TX_CTL_DONTFRAG); 3902 3903 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3904 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3905 r = ieee80211_tx_h_rate_ctrl(&tx); 3906 if (r != TX_CONTINUE) { 3907 ieee80211_free_txskb(&local->hw, skb); 3908 goto begin; 3909 } 3910 } 3911 goto encap_out; 3912 } 3913 3914 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3915 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3916 sta); 3917 u8 pn_offs = 0; 3918 3919 if (tx.key && 3920 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3921 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3922 3923 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3924 tx.key, &tx); 3925 if (r != TX_CONTINUE) { 3926 ieee80211_free_txskb(&local->hw, skb); 3927 goto begin; 3928 } 3929 } else { 3930 if (invoke_tx_handlers_late(&tx)) 3931 goto begin; 3932 3933 skb = __skb_dequeue(&tx.skbs); 3934 info = IEEE80211_SKB_CB(skb); 3935 3936 if (!skb_queue_empty(&tx.skbs)) { 3937 spin_lock_bh(&fq->lock); 3938 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3939 spin_unlock_bh(&fq->lock); 3940 } 3941 } 3942 3943 if (skb_has_frag_list(skb) && 3944 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3945 if (skb_linearize(skb)) { 3946 ieee80211_free_txskb(&local->hw, skb); 3947 goto begin; 3948 } 3949 } 3950 3951 switch (tx.sdata->vif.type) { 3952 case NL80211_IFTYPE_MONITOR: 3953 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 3954 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 3955 vif = &tx.sdata->vif; 3956 break; 3957 } 3958 tx.sdata = rcu_dereference(local->monitor_sdata); 3959 if (tx.sdata && 3960 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 3961 vif = &tx.sdata->vif; 3962 info->hw_queue = 3963 vif->hw_queue[skb_get_queue_mapping(skb)]; 3964 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3965 ieee80211_free_txskb(&local->hw, skb); 3966 goto begin; 3967 } else { 3968 info->control.vif = NULL; 3969 return skb; 3970 } 3971 break; 3972 case NL80211_IFTYPE_AP_VLAN: 3973 tx.sdata = container_of(tx.sdata->bss, 3974 struct ieee80211_sub_if_data, u.ap); 3975 fallthrough; 3976 default: 3977 vif = &tx.sdata->vif; 3978 break; 3979 } 3980 3981 encap_out: 3982 info->control.vif = vif; 3983 3984 if (tx.sta && 3985 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3986 bool ampdu = txq->ac != IEEE80211_AC_VO; 3987 u32 airtime; 3988 3989 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3990 skb->len, ampdu); 3991 if (airtime) { 3992 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3993 ieee80211_sta_update_pending_airtime(local, tx.sta, 3994 txq->ac, 3995 airtime, 3996 false); 3997 } 3998 } 3999 4000 return skb; 4001 4002 out: 4003 spin_unlock_bh(&fq->lock); 4004 4005 return skb; 4006 } 4007 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4008 4009 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4010 { 4011 struct airtime_info *air_info = &sta->airtime[ac]; 4012 4013 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4014 } 4015 4016 static void 4017 ieee80211_txq_set_active(struct txq_info *txqi) 4018 { 4019 struct sta_info *sta; 4020 4021 if (!txqi->txq.sta) 4022 return; 4023 4024 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4025 sta->airtime[txqi->txq.ac].last_active = jiffies; 4026 } 4027 4028 static bool 4029 ieee80211_txq_keep_active(struct txq_info *txqi) 4030 { 4031 struct sta_info *sta; 4032 4033 if (!txqi->txq.sta) 4034 return false; 4035 4036 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4037 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4038 return false; 4039 4040 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4041 } 4042 4043 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4044 { 4045 struct ieee80211_local *local = hw_to_local(hw); 4046 struct ieee80211_txq *ret = NULL; 4047 struct txq_info *txqi = NULL, *head = NULL; 4048 bool found_eligible_txq = false; 4049 4050 spin_lock_bh(&local->active_txq_lock[ac]); 4051 4052 if (!local->schedule_round[ac]) 4053 goto out; 4054 4055 begin: 4056 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4057 struct txq_info, 4058 schedule_order); 4059 if (!txqi) 4060 goto out; 4061 4062 if (txqi == head) { 4063 if (!found_eligible_txq) 4064 goto out; 4065 else 4066 found_eligible_txq = false; 4067 } 4068 4069 if (!head) 4070 head = txqi; 4071 4072 if (txqi->txq.sta) { 4073 struct sta_info *sta = container_of(txqi->txq.sta, 4074 struct sta_info, sta); 4075 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4076 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4077 4078 if (aql_check) 4079 found_eligible_txq = true; 4080 4081 if (deficit < 0) 4082 sta->airtime[txqi->txq.ac].deficit += 4083 sta->airtime_weight; 4084 4085 if (deficit < 0 || !aql_check) { 4086 list_move_tail(&txqi->schedule_order, 4087 &local->active_txqs[txqi->txq.ac]); 4088 goto begin; 4089 } 4090 } 4091 4092 if (txqi->schedule_round == local->schedule_round[ac]) 4093 goto out; 4094 4095 list_del_init(&txqi->schedule_order); 4096 txqi->schedule_round = local->schedule_round[ac]; 4097 ret = &txqi->txq; 4098 4099 out: 4100 spin_unlock_bh(&local->active_txq_lock[ac]); 4101 return ret; 4102 } 4103 EXPORT_SYMBOL(ieee80211_next_txq); 4104 4105 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4106 struct ieee80211_txq *txq, 4107 bool force) 4108 { 4109 struct ieee80211_local *local = hw_to_local(hw); 4110 struct txq_info *txqi = to_txq_info(txq); 4111 bool has_queue; 4112 4113 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4114 4115 has_queue = force || 4116 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4117 txq_has_queue(txq)); 4118 if (list_empty(&txqi->schedule_order) && 4119 (has_queue || ieee80211_txq_keep_active(txqi))) { 4120 /* If airtime accounting is active, always enqueue STAs at the 4121 * head of the list to ensure that they only get moved to the 4122 * back by the airtime DRR scheduler once they have a negative 4123 * deficit. A station that already has a negative deficit will 4124 * get immediately moved to the back of the list on the next 4125 * call to ieee80211_next_txq(). 4126 */ 4127 if (txqi->txq.sta && local->airtime_flags && has_queue && 4128 wiphy_ext_feature_isset(local->hw.wiphy, 4129 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4130 list_add(&txqi->schedule_order, 4131 &local->active_txqs[txq->ac]); 4132 else 4133 list_add_tail(&txqi->schedule_order, 4134 &local->active_txqs[txq->ac]); 4135 if (has_queue) 4136 ieee80211_txq_set_active(txqi); 4137 } 4138 4139 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4140 } 4141 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4142 4143 DEFINE_STATIC_KEY_FALSE(aql_disable); 4144 4145 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4146 struct ieee80211_txq *txq) 4147 { 4148 struct sta_info *sta; 4149 struct ieee80211_local *local = hw_to_local(hw); 4150 4151 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4152 return true; 4153 4154 if (static_branch_unlikely(&aql_disable)) 4155 return true; 4156 4157 if (!txq->sta) 4158 return true; 4159 4160 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4161 return true; 4162 4163 sta = container_of(txq->sta, struct sta_info, sta); 4164 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4165 sta->airtime[txq->ac].aql_limit_low) 4166 return true; 4167 4168 if (atomic_read(&local->aql_total_pending_airtime) < 4169 local->aql_threshold && 4170 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4171 sta->airtime[txq->ac].aql_limit_high) 4172 return true; 4173 4174 return false; 4175 } 4176 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4177 4178 static bool 4179 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4180 { 4181 unsigned int num_txq = 0; 4182 struct txq_info *txq; 4183 u32 aql_limit; 4184 4185 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4186 return true; 4187 4188 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4189 num_txq++; 4190 4191 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4192 local->aql_txq_limit_high[ac]; 4193 4194 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4195 } 4196 4197 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4198 struct ieee80211_txq *txq) 4199 { 4200 struct ieee80211_local *local = hw_to_local(hw); 4201 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4202 struct sta_info *sta; 4203 u8 ac = txq->ac; 4204 4205 spin_lock_bh(&local->active_txq_lock[ac]); 4206 4207 if (!txqi->txq.sta) 4208 goto out; 4209 4210 if (list_empty(&txqi->schedule_order)) 4211 goto out; 4212 4213 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4214 goto out; 4215 4216 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4217 schedule_order) { 4218 if (iter == txqi) 4219 break; 4220 4221 if (!iter->txq.sta) { 4222 list_move_tail(&iter->schedule_order, 4223 &local->active_txqs[ac]); 4224 continue; 4225 } 4226 sta = container_of(iter->txq.sta, struct sta_info, sta); 4227 if (ieee80211_sta_deficit(sta, ac) < 0) 4228 sta->airtime[ac].deficit += sta->airtime_weight; 4229 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4230 } 4231 4232 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4233 if (sta->airtime[ac].deficit >= 0) 4234 goto out; 4235 4236 sta->airtime[ac].deficit += sta->airtime_weight; 4237 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4238 spin_unlock_bh(&local->active_txq_lock[ac]); 4239 4240 return false; 4241 out: 4242 if (!list_empty(&txqi->schedule_order)) 4243 list_del_init(&txqi->schedule_order); 4244 spin_unlock_bh(&local->active_txq_lock[ac]); 4245 4246 return true; 4247 } 4248 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4249 4250 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4251 { 4252 struct ieee80211_local *local = hw_to_local(hw); 4253 4254 spin_lock_bh(&local->active_txq_lock[ac]); 4255 4256 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4257 local->schedule_round[ac]++; 4258 if (!local->schedule_round[ac]) 4259 local->schedule_round[ac]++; 4260 } else { 4261 local->schedule_round[ac] = 0; 4262 } 4263 4264 spin_unlock_bh(&local->active_txq_lock[ac]); 4265 } 4266 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4267 4268 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4269 struct net_device *dev, 4270 u32 info_flags, 4271 u32 ctrl_flags, 4272 u64 *cookie) 4273 { 4274 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4275 struct ieee80211_local *local = sdata->local; 4276 struct sta_info *sta; 4277 struct sk_buff *next; 4278 int len = skb->len; 4279 4280 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4281 kfree_skb(skb); 4282 return; 4283 } 4284 4285 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4286 4287 rcu_read_lock(); 4288 4289 if (ieee80211_vif_is_mesh(&sdata->vif) && 4290 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4291 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4292 goto out; 4293 4294 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4295 goto out_free; 4296 4297 if (IS_ERR(sta)) 4298 sta = NULL; 4299 4300 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4301 ieee80211_aggr_check(sdata, sta, skb); 4302 4303 if (sta) { 4304 struct ieee80211_fast_tx *fast_tx; 4305 4306 fast_tx = rcu_dereference(sta->fast_tx); 4307 4308 if (fast_tx && 4309 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4310 goto out; 4311 } 4312 4313 /* the frame could be fragmented, software-encrypted, and other 4314 * things so we cannot really handle checksum or GSO offload. 4315 * fix it up in software before we handle anything else. 4316 */ 4317 skb = ieee80211_tx_skb_fixup(skb, 0); 4318 if (!skb) { 4319 len = 0; 4320 goto out; 4321 } 4322 4323 skb_list_walk_safe(skb, skb, next) { 4324 skb_mark_not_on_list(skb); 4325 4326 if (skb->protocol == sdata->control_port_protocol) 4327 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4328 4329 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4330 sta, ctrl_flags, cookie); 4331 if (IS_ERR(skb)) { 4332 kfree_skb_list(next); 4333 goto out; 4334 } 4335 4336 dev_sw_netstats_tx_add(dev, 1, skb->len); 4337 4338 ieee80211_xmit(sdata, sta, skb); 4339 } 4340 goto out; 4341 out_free: 4342 kfree_skb(skb); 4343 len = 0; 4344 out: 4345 if (len) 4346 ieee80211_tpt_led_trig_tx(local, len); 4347 rcu_read_unlock(); 4348 } 4349 4350 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4351 { 4352 struct ethhdr *eth; 4353 int err; 4354 4355 err = skb_ensure_writable(skb, ETH_HLEN); 4356 if (unlikely(err)) 4357 return err; 4358 4359 eth = (void *)skb->data; 4360 ether_addr_copy(eth->h_dest, sta->sta.addr); 4361 4362 return 0; 4363 } 4364 4365 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4366 struct net_device *dev) 4367 { 4368 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4369 const struct ethhdr *eth = (void *)skb->data; 4370 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4371 __be16 ethertype; 4372 4373 switch (sdata->vif.type) { 4374 case NL80211_IFTYPE_AP_VLAN: 4375 if (sdata->u.vlan.sta) 4376 return false; 4377 if (sdata->wdev.use_4addr) 4378 return false; 4379 fallthrough; 4380 case NL80211_IFTYPE_AP: 4381 /* check runtime toggle for this bss */ 4382 if (!sdata->bss->multicast_to_unicast) 4383 return false; 4384 break; 4385 default: 4386 return false; 4387 } 4388 4389 /* multicast to unicast conversion only for some payload */ 4390 ethertype = eth->h_proto; 4391 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4392 ethertype = ethvlan->h_vlan_encapsulated_proto; 4393 switch (ethertype) { 4394 case htons(ETH_P_ARP): 4395 case htons(ETH_P_IP): 4396 case htons(ETH_P_IPV6): 4397 break; 4398 default: 4399 return false; 4400 } 4401 4402 return true; 4403 } 4404 4405 static void 4406 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4407 struct sk_buff_head *queue) 4408 { 4409 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4410 struct ieee80211_local *local = sdata->local; 4411 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4412 struct sta_info *sta, *first = NULL; 4413 struct sk_buff *cloned_skb; 4414 4415 rcu_read_lock(); 4416 4417 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4418 if (sdata != sta->sdata) 4419 /* AP-VLAN mismatch */ 4420 continue; 4421 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4422 /* do not send back to source */ 4423 continue; 4424 if (!first) { 4425 first = sta; 4426 continue; 4427 } 4428 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4429 if (!cloned_skb) 4430 goto multicast; 4431 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4432 dev_kfree_skb(cloned_skb); 4433 goto multicast; 4434 } 4435 __skb_queue_tail(queue, cloned_skb); 4436 } 4437 4438 if (likely(first)) { 4439 if (unlikely(ieee80211_change_da(skb, first))) 4440 goto multicast; 4441 __skb_queue_tail(queue, skb); 4442 } else { 4443 /* no STA connected, drop */ 4444 kfree_skb(skb); 4445 skb = NULL; 4446 } 4447 4448 goto out; 4449 multicast: 4450 __skb_queue_purge(queue); 4451 __skb_queue_tail(queue, skb); 4452 out: 4453 rcu_read_unlock(); 4454 } 4455 4456 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4457 struct sk_buff *skb, u32 ctrl_flags, 4458 unsigned int link_id) 4459 { 4460 struct sk_buff *out; 4461 4462 out = skb_copy(skb, GFP_ATOMIC); 4463 if (!out) 4464 return; 4465 4466 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4467 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4468 } 4469 4470 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4471 struct sk_buff *skb) 4472 { 4473 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4474 unsigned long links = sdata->vif.active_links; 4475 unsigned int link; 4476 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4477 4478 if (hweight16(links) == 1) { 4479 ctrl_flags |= u32_encode_bits(__ffs(links), 4480 IEEE80211_TX_CTRL_MLO_LINK); 4481 4482 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4483 NULL); 4484 return; 4485 } 4486 4487 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4488 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4489 ctrl_flags = 0; 4490 } 4491 kfree_skb(skb); 4492 } 4493 4494 /** 4495 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4496 * @skb: packet to be sent 4497 * @dev: incoming interface 4498 * 4499 * On failure skb will be freed. 4500 * 4501 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4502 */ 4503 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4504 struct net_device *dev) 4505 { 4506 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4507 const struct ethhdr *eth = (void *)skb->data; 4508 4509 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4510 goto normal; 4511 4512 if (unlikely(!ieee80211_sdata_running(sdata))) { 4513 kfree_skb(skb); 4514 return NETDEV_TX_OK; 4515 } 4516 4517 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4518 struct sk_buff_head queue; 4519 4520 __skb_queue_head_init(&queue); 4521 ieee80211_convert_to_unicast(skb, dev, &queue); 4522 while ((skb = __skb_dequeue(&queue))) 4523 __ieee80211_subif_start_xmit(skb, dev, 0, 4524 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4525 NULL); 4526 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4527 ((sdata->vif.type == NL80211_IFTYPE_AP && 4528 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4529 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4530 !sdata->wdev.use_4addr))) { 4531 ieee80211_mlo_multicast_tx(dev, skb); 4532 } else { 4533 normal: 4534 __ieee80211_subif_start_xmit(skb, dev, 0, 4535 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4536 NULL); 4537 } 4538 4539 return NETDEV_TX_OK; 4540 } 4541 4542 4543 4544 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4545 struct sk_buff *skb, struct sta_info *sta, 4546 bool txpending) 4547 { 4548 struct ieee80211_local *local = sdata->local; 4549 struct ieee80211_tx_control control = {}; 4550 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4551 struct ieee80211_sta *pubsta = NULL; 4552 unsigned long flags; 4553 int q = info->hw_queue; 4554 4555 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4556 4557 if (local->queue_stop_reasons[q] || 4558 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4559 if (txpending) 4560 skb_queue_head(&local->pending[q], skb); 4561 else 4562 skb_queue_tail(&local->pending[q], skb); 4563 4564 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4565 4566 return false; 4567 } 4568 4569 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4570 4571 if (sta && sta->uploaded) 4572 pubsta = &sta->sta; 4573 4574 control.sta = pubsta; 4575 4576 drv_tx(local, &control, skb); 4577 4578 return true; 4579 } 4580 4581 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4582 struct sk_buff *skb, struct sta_info *sta, 4583 bool txpending) 4584 { 4585 struct ieee80211_local *local = sdata->local; 4586 struct sk_buff *next; 4587 bool ret = true; 4588 4589 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4590 return true; 4591 4592 skb_list_walk_safe(skb, skb, next) { 4593 skb_mark_not_on_list(skb); 4594 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4595 ret = false; 4596 } 4597 4598 return ret; 4599 } 4600 4601 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4602 struct net_device *dev, struct sta_info *sta, 4603 struct ieee80211_key *key, struct sk_buff *skb) 4604 { 4605 struct ieee80211_tx_info *info; 4606 struct ieee80211_local *local = sdata->local; 4607 struct tid_ampdu_tx *tid_tx; 4608 struct sk_buff *seg, *next; 4609 unsigned int skbs = 0, len = 0; 4610 u16 queue; 4611 u8 tid; 4612 4613 queue = ieee80211_select_queue(sdata, sta, skb); 4614 skb_set_queue_mapping(skb, queue); 4615 4616 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4617 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4618 goto out_free; 4619 4620 skb = skb_share_check(skb, GFP_ATOMIC); 4621 if (unlikely(!skb)) 4622 return; 4623 4624 ieee80211_aggr_check(sdata, sta, skb); 4625 4626 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4627 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4628 if (tid_tx) { 4629 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4630 /* fall back to non-offload slow path */ 4631 __ieee80211_subif_start_xmit(skb, dev, 0, 4632 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4633 NULL); 4634 return; 4635 } 4636 4637 if (tid_tx->timeout) 4638 tid_tx->last_tx = jiffies; 4639 } 4640 4641 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4642 if (!skb) 4643 return; 4644 4645 info = IEEE80211_SKB_CB(skb); 4646 memset(info, 0, sizeof(*info)); 4647 4648 info->hw_queue = sdata->vif.hw_queue[queue]; 4649 4650 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4651 sdata = container_of(sdata->bss, 4652 struct ieee80211_sub_if_data, u.ap); 4653 4654 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4655 info->control.vif = &sdata->vif; 4656 4657 if (key) 4658 info->control.hw_key = &key->conf; 4659 4660 skb_list_walk_safe(skb, seg, next) { 4661 skbs++; 4662 len += seg->len; 4663 if (seg != skb) 4664 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4665 } 4666 4667 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4668 info->status_data = ieee80211_store_ack_skb(local, skb, 4669 &info->flags, NULL); 4670 if (info->status_data) 4671 info->status_data_idr = 1; 4672 } 4673 4674 dev_sw_netstats_tx_add(dev, skbs, len); 4675 sta->deflink.tx_stats.packets[queue] += skbs; 4676 sta->deflink.tx_stats.bytes[queue] += len; 4677 4678 ieee80211_tpt_led_trig_tx(local, len); 4679 4680 ieee80211_tx_8023(sdata, skb, sta, false); 4681 4682 return; 4683 4684 out_free: 4685 kfree_skb(skb); 4686 } 4687 4688 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4689 struct net_device *dev) 4690 { 4691 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4692 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4693 struct ieee80211_key *key; 4694 struct sta_info *sta; 4695 4696 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4697 kfree_skb(skb); 4698 return NETDEV_TX_OK; 4699 } 4700 4701 rcu_read_lock(); 4702 4703 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4704 kfree_skb(skb); 4705 goto out; 4706 } 4707 4708 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4709 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4710 sdata->control_port_protocol == ehdr->h_proto)) 4711 goto skip_offload; 4712 4713 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4714 if (!key) 4715 key = rcu_dereference(sdata->default_unicast_key); 4716 4717 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4718 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4719 goto skip_offload; 4720 4721 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4722 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4723 goto out; 4724 4725 skip_offload: 4726 ieee80211_subif_start_xmit(skb, dev); 4727 out: 4728 rcu_read_unlock(); 4729 4730 return NETDEV_TX_OK; 4731 } 4732 4733 struct sk_buff * 4734 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4735 struct sk_buff *skb, u32 info_flags) 4736 { 4737 struct ieee80211_hdr *hdr; 4738 struct ieee80211_tx_data tx = { 4739 .local = sdata->local, 4740 .sdata = sdata, 4741 }; 4742 struct sta_info *sta; 4743 4744 rcu_read_lock(); 4745 4746 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4747 kfree_skb(skb); 4748 skb = ERR_PTR(-EINVAL); 4749 goto out; 4750 } 4751 4752 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4753 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4754 if (IS_ERR(skb)) 4755 goto out; 4756 4757 hdr = (void *)skb->data; 4758 tx.sta = sta_info_get(sdata, hdr->addr1); 4759 tx.skb = skb; 4760 4761 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4762 rcu_read_unlock(); 4763 kfree_skb(skb); 4764 return ERR_PTR(-EINVAL); 4765 } 4766 4767 out: 4768 rcu_read_unlock(); 4769 return skb; 4770 } 4771 4772 /* 4773 * ieee80211_clear_tx_pending may not be called in a context where 4774 * it is possible that it packets could come in again. 4775 */ 4776 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4777 { 4778 struct sk_buff *skb; 4779 int i; 4780 4781 for (i = 0; i < local->hw.queues; i++) { 4782 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4783 ieee80211_free_txskb(&local->hw, skb); 4784 } 4785 } 4786 4787 /* 4788 * Returns false if the frame couldn't be transmitted but was queued instead, 4789 * which in this case means re-queued -- take as an indication to stop sending 4790 * more pending frames. 4791 */ 4792 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4793 struct sk_buff *skb) 4794 { 4795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4796 struct ieee80211_sub_if_data *sdata; 4797 struct sta_info *sta; 4798 struct ieee80211_hdr *hdr; 4799 bool result; 4800 struct ieee80211_chanctx_conf *chanctx_conf; 4801 4802 sdata = vif_to_sdata(info->control.vif); 4803 4804 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4805 /* update band only for non-MLD */ 4806 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4807 chanctx_conf = 4808 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4809 if (unlikely(!chanctx_conf)) { 4810 dev_kfree_skb(skb); 4811 return true; 4812 } 4813 info->band = chanctx_conf->def.chan->band; 4814 } 4815 result = ieee80211_tx(sdata, NULL, skb, true); 4816 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4817 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4818 dev_kfree_skb(skb); 4819 return true; 4820 } 4821 4822 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4823 sta = NULL; 4824 4825 result = ieee80211_tx_8023(sdata, skb, sta, true); 4826 } else { 4827 struct sk_buff_head skbs; 4828 4829 __skb_queue_head_init(&skbs); 4830 __skb_queue_tail(&skbs, skb); 4831 4832 hdr = (struct ieee80211_hdr *)skb->data; 4833 sta = sta_info_get(sdata, hdr->addr1); 4834 4835 result = __ieee80211_tx(local, &skbs, sta, true); 4836 } 4837 4838 return result; 4839 } 4840 4841 /* 4842 * Transmit all pending packets. Called from tasklet. 4843 */ 4844 void ieee80211_tx_pending(struct tasklet_struct *t) 4845 { 4846 struct ieee80211_local *local = from_tasklet(local, t, 4847 tx_pending_tasklet); 4848 unsigned long flags; 4849 int i; 4850 bool txok; 4851 4852 rcu_read_lock(); 4853 4854 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4855 for (i = 0; i < local->hw.queues; i++) { 4856 /* 4857 * If queue is stopped by something other than due to pending 4858 * frames, or we have no pending frames, proceed to next queue. 4859 */ 4860 if (local->queue_stop_reasons[i] || 4861 skb_queue_empty(&local->pending[i])) 4862 continue; 4863 4864 while (!skb_queue_empty(&local->pending[i])) { 4865 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4866 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4867 4868 if (WARN_ON(!info->control.vif)) { 4869 ieee80211_free_txskb(&local->hw, skb); 4870 continue; 4871 } 4872 4873 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4874 flags); 4875 4876 txok = ieee80211_tx_pending_skb(local, skb); 4877 spin_lock_irqsave(&local->queue_stop_reason_lock, 4878 flags); 4879 if (!txok) 4880 break; 4881 } 4882 } 4883 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4884 4885 rcu_read_unlock(); 4886 } 4887 4888 /* functions for drivers to get certain frames */ 4889 4890 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 4891 struct sk_buff *skb, 4892 bool mcast_traffic) 4893 { 4894 int i, n1 = 0, n2; 4895 4896 /* 4897 * Find largest even number N1 so that bits numbered 1 through 4898 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4899 * (N2 + 1) x 8 through 2007 are 0. 4900 */ 4901 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4902 if (ps->tim[i]) { 4903 n1 = i & 0xfe; 4904 break; 4905 } 4906 } 4907 n2 = n1; 4908 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4909 if (ps->tim[i]) { 4910 n2 = i; 4911 break; 4912 } 4913 } 4914 4915 /* Bitmap control */ 4916 skb_put_u8(skb, n1 | mcast_traffic); 4917 /* Part Virt Bitmap */ 4918 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4919 } 4920 4921 /* 4922 * mac80211 currently supports encoding using block bitmap mode, non 4923 * inversed. The current implementation supports up to 1600 AIDs. 4924 * 4925 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 4926 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 4927 * describes 8 AIDs and the presence of a subblock is determined by 4928 * the block bitmap. 4929 */ 4930 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 4931 struct sk_buff *skb, 4932 bool mcast_traffic) 4933 { 4934 int blk; 4935 4936 /* 4937 * Emit a bitmap control block with a page slice number of 31 and a 4938 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 4939 * that the entire page (2048 bits) indicated by the page index 4940 * is encoded in the partial virtual bitmap. 4941 */ 4942 skb_put_u8(skb, mcast_traffic | (31 << 1)); 4943 4944 /* Emit an encoded block for each non-zero sub-block */ 4945 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 4946 u8 blk_bmap = 0; 4947 int sblk; 4948 4949 for (sblk = 0; sblk < 8; sblk++) { 4950 int sblk_idx = blk * 8 + sblk; 4951 4952 /* 4953 * If the current subblock is non-zero, increase the 4954 * number of subblocks to emit for the current block. 4955 */ 4956 if (ps->tim[sblk_idx]) 4957 blk_bmap |= BIT(sblk); 4958 } 4959 4960 /* If the current block contains no non-zero sublocks */ 4961 if (!blk_bmap) 4962 continue; 4963 4964 /* 4965 * Emit a block control byte for the current encoded block 4966 * with an encoding mode of block bitmap (0x0), not inverse 4967 * (0x0) and the current block offset (5 bits) 4968 */ 4969 skb_put_u8(skb, blk << 3); 4970 4971 /* 4972 * Emit the block bitmap for the current encoded block which 4973 * contains the present subblocks. 4974 */ 4975 skb_put_u8(skb, blk_bmap); 4976 4977 /* Emit the present subblocks */ 4978 for (sblk = 0; sblk < 8; sblk++) { 4979 int sblk_idx = blk * 8 + sblk; 4980 4981 if (!(blk_bmap & BIT(sblk))) 4982 continue; 4983 4984 skb_put_u8(skb, ps->tim[sblk_idx]); 4985 } 4986 } 4987 } 4988 4989 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4990 struct ieee80211_link_data *link, 4991 struct ps_data *ps, struct sk_buff *skb, 4992 bool is_template) 4993 { 4994 struct element *tim; 4995 bool mcast_traffic = false, have_bits = false; 4996 struct ieee80211_bss_conf *link_conf = link->conf; 4997 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 4998 4999 /* Generate bitmap for TIM only if there are any STAs in power save 5000 * mode. */ 5001 if (atomic_read(&ps->num_sta_ps) > 0) 5002 /* in the hope that this is faster than 5003 * checking byte-for-byte */ 5004 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5005 IEEE80211_MAX_AID + 1); 5006 5007 if (!is_template) { 5008 if (ps->dtim_count == 0) 5009 ps->dtim_count = link_conf->dtim_period - 1; 5010 else 5011 ps->dtim_count--; 5012 } 5013 5014 /* Length is set after parsing the AID bitmap */ 5015 tim = skb_put(skb, sizeof(struct element)); 5016 tim->id = WLAN_EID_TIM; 5017 skb_put_u8(skb, ps->dtim_count); 5018 skb_put_u8(skb, link_conf->dtim_period); 5019 5020 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5021 mcast_traffic = true; 5022 5023 ps->dtim_bc_mc = mcast_traffic; 5024 5025 if (have_bits) { 5026 if (s1g) 5027 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, 5028 mcast_traffic); 5029 else 5030 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5031 } else { 5032 /* 5033 * If there is no buffered unicast traffic for an S1G 5034 * interface, we can exclude the bitmap control. This is in 5035 * contrast to other phy types as they do include the bitmap 5036 * control and pvb even when there is no buffered traffic. 5037 */ 5038 if (!s1g) { 5039 /* Bitmap control */ 5040 skb_put_u8(skb, mcast_traffic); 5041 /* Part Virt Bitmap */ 5042 skb_put_u8(skb, 0); 5043 } 5044 } 5045 5046 tim->datalen = skb_tail_pointer(skb) - tim->data; 5047 } 5048 5049 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5050 struct ieee80211_link_data *link, 5051 struct ps_data *ps, struct sk_buff *skb, 5052 bool is_template) 5053 { 5054 struct ieee80211_local *local = sdata->local; 5055 5056 /* 5057 * Not very nice, but we want to allow the driver to call 5058 * ieee80211_beacon_get() as a response to the set_tim() 5059 * callback. That, however, is already invoked under the 5060 * sta_lock to guarantee consistent and race-free update 5061 * of the tim bitmap in mac80211 and the driver. 5062 */ 5063 if (local->tim_in_locked_section) { 5064 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5065 } else { 5066 spin_lock_bh(&local->tim_lock); 5067 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5068 spin_unlock_bh(&local->tim_lock); 5069 } 5070 5071 return 0; 5072 } 5073 5074 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5075 struct beacon_data *beacon, 5076 struct ieee80211_link_data *link) 5077 { 5078 u8 *beacon_data, count, max_count = 1; 5079 struct probe_resp *resp; 5080 size_t beacon_data_len; 5081 u16 *bcn_offsets; 5082 int i; 5083 5084 switch (sdata->vif.type) { 5085 case NL80211_IFTYPE_AP: 5086 beacon_data = beacon->tail; 5087 beacon_data_len = beacon->tail_len; 5088 break; 5089 case NL80211_IFTYPE_ADHOC: 5090 beacon_data = beacon->head; 5091 beacon_data_len = beacon->head_len; 5092 break; 5093 case NL80211_IFTYPE_MESH_POINT: 5094 beacon_data = beacon->head; 5095 beacon_data_len = beacon->head_len; 5096 break; 5097 default: 5098 return; 5099 } 5100 5101 resp = rcu_dereference(link->u.ap.probe_resp); 5102 5103 bcn_offsets = beacon->cntdwn_counter_offsets; 5104 count = beacon->cntdwn_current_counter; 5105 if (link->conf->csa_active) 5106 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5107 5108 for (i = 0; i < max_count; ++i) { 5109 if (bcn_offsets[i]) { 5110 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5111 return; 5112 beacon_data[bcn_offsets[i]] = count; 5113 } 5114 5115 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5116 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5117 5118 resp->data[resp_offsets[i]] = count; 5119 } 5120 } 5121 } 5122 5123 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5124 struct beacon_data *beacon) 5125 { 5126 if (beacon->cntdwn_current_counter == 1) { 5127 /* 5128 * Channel switch handling is done by a worker thread while 5129 * beacons get pulled from hardware timers. It's therefore 5130 * possible that software threads are slow enough to not be 5131 * able to complete CSA handling in a single beacon interval, 5132 * in which case we get here. There isn't much to do about 5133 * it, other than letting the user know that the AP isn't 5134 * behaving correctly. 5135 */ 5136 link_err_once(link, 5137 "beacon TX faster than countdown (channel/color switch) completion\n"); 5138 return 0; 5139 } 5140 5141 beacon->cntdwn_current_counter--; 5142 5143 return beacon->cntdwn_current_counter; 5144 } 5145 5146 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5147 { 5148 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5149 struct ieee80211_link_data *link; 5150 struct beacon_data *beacon = NULL; 5151 u8 count = 0; 5152 5153 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5154 return 0; 5155 5156 rcu_read_lock(); 5157 5158 link = rcu_dereference(sdata->link[link_id]); 5159 if (!link) 5160 goto unlock; 5161 5162 if (sdata->vif.type == NL80211_IFTYPE_AP) 5163 beacon = rcu_dereference(link->u.ap.beacon); 5164 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5165 beacon = rcu_dereference(sdata->u.ibss.presp); 5166 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5167 beacon = rcu_dereference(sdata->u.mesh.beacon); 5168 5169 if (!beacon) 5170 goto unlock; 5171 5172 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5173 5174 unlock: 5175 rcu_read_unlock(); 5176 return count; 5177 } 5178 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5179 5180 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5181 { 5182 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5183 struct beacon_data *beacon = NULL; 5184 5185 rcu_read_lock(); 5186 5187 if (sdata->vif.type == NL80211_IFTYPE_AP) 5188 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5189 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5190 beacon = rcu_dereference(sdata->u.ibss.presp); 5191 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5192 beacon = rcu_dereference(sdata->u.mesh.beacon); 5193 5194 if (!beacon) 5195 goto unlock; 5196 5197 if (counter < beacon->cntdwn_current_counter) 5198 beacon->cntdwn_current_counter = counter; 5199 5200 unlock: 5201 rcu_read_unlock(); 5202 } 5203 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5204 5205 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5206 unsigned int link_id) 5207 { 5208 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5209 struct ieee80211_link_data *link; 5210 struct beacon_data *beacon = NULL; 5211 u8 *beacon_data; 5212 size_t beacon_data_len; 5213 int ret = false; 5214 5215 if (!ieee80211_sdata_running(sdata)) 5216 return false; 5217 5218 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5219 return 0; 5220 5221 rcu_read_lock(); 5222 5223 link = rcu_dereference(sdata->link[link_id]); 5224 if (!link) 5225 goto out; 5226 5227 if (vif->type == NL80211_IFTYPE_AP) { 5228 beacon = rcu_dereference(link->u.ap.beacon); 5229 if (WARN_ON(!beacon || !beacon->tail)) 5230 goto out; 5231 beacon_data = beacon->tail; 5232 beacon_data_len = beacon->tail_len; 5233 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5234 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5235 5236 beacon = rcu_dereference(ifibss->presp); 5237 if (!beacon) 5238 goto out; 5239 5240 beacon_data = beacon->head; 5241 beacon_data_len = beacon->head_len; 5242 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5243 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5244 5245 beacon = rcu_dereference(ifmsh->beacon); 5246 if (!beacon) 5247 goto out; 5248 5249 beacon_data = beacon->head; 5250 beacon_data_len = beacon->head_len; 5251 } else { 5252 WARN_ON(1); 5253 goto out; 5254 } 5255 5256 if (!beacon->cntdwn_counter_offsets[0]) 5257 goto out; 5258 5259 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5260 goto out; 5261 5262 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5263 ret = true; 5264 5265 out: 5266 rcu_read_unlock(); 5267 5268 return ret; 5269 } 5270 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5271 5272 static int ieee80211_beacon_protect(struct sk_buff *skb, 5273 struct ieee80211_local *local, 5274 struct ieee80211_sub_if_data *sdata, 5275 struct ieee80211_link_data *link) 5276 { 5277 ieee80211_tx_result res; 5278 struct ieee80211_tx_data tx; 5279 struct sk_buff *check_skb; 5280 5281 memset(&tx, 0, sizeof(tx)); 5282 tx.key = rcu_dereference(link->default_beacon_key); 5283 if (!tx.key) 5284 return 0; 5285 5286 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5287 tx.key = NULL; 5288 return -EINVAL; 5289 } 5290 5291 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5292 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5293 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5294 5295 tx.local = local; 5296 tx.sdata = sdata; 5297 __skb_queue_head_init(&tx.skbs); 5298 __skb_queue_tail(&tx.skbs, skb); 5299 res = ieee80211_tx_h_encrypt(&tx); 5300 check_skb = __skb_dequeue(&tx.skbs); 5301 /* we may crash after this, but it'd be a bug in crypto */ 5302 WARN_ON(check_skb != skb); 5303 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5304 return -EINVAL; 5305 5306 return 0; 5307 } 5308 5309 static void 5310 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5311 struct ieee80211_vif *vif, 5312 struct ieee80211_link_data *link, 5313 struct ieee80211_mutable_offsets *offs, 5314 struct beacon_data *beacon, 5315 struct sk_buff *skb, 5316 struct ieee80211_chanctx_conf *chanctx_conf, 5317 u16 csa_off_base) 5318 { 5319 struct ieee80211_local *local = hw_to_local(hw); 5320 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5321 struct ieee80211_tx_info *info; 5322 enum nl80211_band band; 5323 struct ieee80211_tx_rate_control txrc; 5324 5325 /* CSA offsets */ 5326 if (offs && beacon) { 5327 u16 i; 5328 5329 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5330 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5331 5332 if (!csa_off) 5333 continue; 5334 5335 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5336 } 5337 } 5338 5339 band = chanctx_conf->def.chan->band; 5340 info = IEEE80211_SKB_CB(skb); 5341 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5342 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5343 info->band = band; 5344 5345 memset(&txrc, 0, sizeof(txrc)); 5346 txrc.hw = hw; 5347 txrc.sband = local->hw.wiphy->bands[band]; 5348 txrc.bss_conf = link->conf; 5349 txrc.skb = skb; 5350 txrc.reported_rate.idx = -1; 5351 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5352 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5353 else 5354 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5355 txrc.bss = true; 5356 rate_control_get_rate(sdata, NULL, &txrc); 5357 5358 info->control.vif = vif; 5359 info->control.flags |= u32_encode_bits(link->link_id, 5360 IEEE80211_TX_CTRL_MLO_LINK); 5361 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5362 IEEE80211_TX_CTL_ASSIGN_SEQ | 5363 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5364 } 5365 5366 static void 5367 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5368 u8 i) 5369 { 5370 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5371 i > beacon->mbssid_ies->cnt) 5372 return; 5373 5374 if (i < beacon->mbssid_ies->cnt) { 5375 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5376 beacon->mbssid_ies->elem[i].len); 5377 5378 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5379 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5380 beacon->rnr_ies->elem[i].len); 5381 5382 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5383 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5384 beacon->rnr_ies->elem[i].len); 5385 } 5386 return; 5387 } 5388 5389 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5390 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5391 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5392 beacon->mbssid_ies->elem[i].len); 5393 } 5394 5395 static struct sk_buff * 5396 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5397 struct ieee80211_vif *vif, 5398 struct ieee80211_link_data *link, 5399 struct ieee80211_mutable_offsets *offs, 5400 bool is_template, 5401 struct beacon_data *beacon, 5402 struct ieee80211_chanctx_conf *chanctx_conf, 5403 u8 ema_index) 5404 { 5405 struct ieee80211_local *local = hw_to_local(hw); 5406 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5407 struct ieee80211_if_ap *ap = &sdata->u.ap; 5408 struct sk_buff *skb = NULL; 5409 u16 csa_off_base = 0; 5410 int mbssid_len; 5411 5412 if (beacon->cntdwn_counter_offsets[0]) { 5413 if (!is_template) 5414 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5415 5416 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5417 } 5418 5419 /* headroom, head length, 5420 * tail length, maximum TIM length and multiple BSSID length 5421 */ 5422 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5423 beacon->rnr_ies, 5424 ema_index); 5425 5426 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5427 beacon->tail_len + 256 + 5428 local->hw.extra_beacon_tailroom + mbssid_len); 5429 if (!skb) 5430 return NULL; 5431 5432 skb_reserve(skb, local->tx_headroom); 5433 skb_put_data(skb, beacon->head, beacon->head_len); 5434 5435 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5436 5437 if (offs) { 5438 offs->tim_offset = beacon->head_len; 5439 offs->tim_length = skb->len - beacon->head_len; 5440 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5441 5442 if (mbssid_len) { 5443 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5444 offs->mbssid_off = skb->len - mbssid_len; 5445 } 5446 5447 /* for AP the csa offsets are from tail */ 5448 csa_off_base = skb->len; 5449 } 5450 5451 if (beacon->tail) 5452 skb_put_data(skb, beacon->tail, beacon->tail_len); 5453 5454 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5455 dev_kfree_skb(skb); 5456 return NULL; 5457 } 5458 5459 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5460 chanctx_conf, csa_off_base); 5461 return skb; 5462 } 5463 5464 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5465 struct ieee80211_link_data *link) 5466 { 5467 struct ps_data *ps = &sdata->u.ap.ps; 5468 5469 if (ps->sb_count == 0) 5470 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5471 else 5472 ps->sb_count--; 5473 5474 return ps->sb_count == 0; 5475 } 5476 5477 static struct sk_buff * 5478 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5479 struct ieee80211_vif *vif, 5480 struct ieee80211_link_data *link, 5481 struct ieee80211_chanctx_conf *chanctx_conf, 5482 struct s1g_short_beacon_data *sb, 5483 bool is_template) 5484 { 5485 struct ieee80211_local *local = hw_to_local(hw); 5486 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5487 struct ieee80211_if_ap *ap = &sdata->u.ap; 5488 struct sk_buff *skb; 5489 5490 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5491 sb->short_tail_len + 256 + 5492 local->hw.extra_beacon_tailroom); 5493 if (!skb) 5494 return NULL; 5495 5496 skb_reserve(skb, local->tx_headroom); 5497 skb_put_data(skb, sb->short_head, sb->short_head_len); 5498 5499 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5500 5501 if (sb->short_tail) 5502 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5503 5504 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5505 chanctx_conf, 0); 5506 return skb; 5507 } 5508 5509 static struct sk_buff * 5510 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5511 struct ieee80211_link_data *link, 5512 struct ieee80211_mutable_offsets *offs, 5513 bool is_template, struct beacon_data *beacon, 5514 struct ieee80211_chanctx_conf *chanctx_conf, 5515 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5516 { 5517 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5518 5519 if (!sdata->vif.cfg.s1g || !s1g_sb || 5520 ieee80211_s1g_need_long_beacon(sdata, link)) 5521 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5522 is_template, beacon, 5523 chanctx_conf, ema_index); 5524 5525 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5526 s1g_sb, is_template); 5527 } 5528 5529 static struct ieee80211_ema_beacons * 5530 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5531 struct ieee80211_vif *vif, 5532 struct ieee80211_link_data *link, 5533 struct ieee80211_mutable_offsets *offs, 5534 bool is_template, struct beacon_data *beacon, 5535 struct ieee80211_chanctx_conf *chanctx_conf) 5536 { 5537 struct ieee80211_ema_beacons *ema = NULL; 5538 5539 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5540 return NULL; 5541 5542 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5543 GFP_ATOMIC); 5544 if (!ema) 5545 return NULL; 5546 5547 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5548 ema->bcn[ema->cnt].skb = 5549 ieee80211_beacon_get_ap(hw, vif, link, 5550 &ema->bcn[ema->cnt].offs, 5551 is_template, beacon, 5552 chanctx_conf, ema->cnt, NULL); 5553 if (!ema->bcn[ema->cnt].skb) 5554 break; 5555 } 5556 5557 if (ema->cnt == beacon->mbssid_ies->cnt) 5558 return ema; 5559 5560 ieee80211_beacon_free_ema_list(ema); 5561 return NULL; 5562 } 5563 5564 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5565 5566 static struct sk_buff * 5567 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5568 struct ieee80211_vif *vif, 5569 struct ieee80211_mutable_offsets *offs, 5570 bool is_template, 5571 unsigned int link_id, 5572 int ema_index, 5573 struct ieee80211_ema_beacons **ema_beacons) 5574 { 5575 struct ieee80211_local *local = hw_to_local(hw); 5576 struct beacon_data *beacon = NULL; 5577 struct sk_buff *skb = NULL; 5578 struct ieee80211_sub_if_data *sdata = NULL; 5579 struct ieee80211_chanctx_conf *chanctx_conf; 5580 struct ieee80211_link_data *link; 5581 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5582 5583 rcu_read_lock(); 5584 5585 sdata = vif_to_sdata(vif); 5586 link = rcu_dereference(sdata->link[link_id]); 5587 if (!link) 5588 goto out; 5589 chanctx_conf = 5590 rcu_dereference(link->conf->chanctx_conf); 5591 5592 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5593 goto out; 5594 5595 if (offs) 5596 memset(offs, 0, sizeof(*offs)); 5597 5598 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5599 beacon = rcu_dereference(link->u.ap.beacon); 5600 if (!beacon) 5601 goto out; 5602 5603 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5604 s1g_short_bcn = 5605 rcu_dereference(link->u.ap.s1g_short_beacon); 5606 if (!s1g_short_bcn) 5607 goto out; 5608 } 5609 5610 if (ema_beacons) { 5611 *ema_beacons = 5612 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5613 offs, 5614 is_template, 5615 beacon, 5616 chanctx_conf); 5617 } else { 5618 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5619 if (ema_index >= beacon->mbssid_ies->cnt) 5620 goto out; /* End of MBSSID elements */ 5621 5622 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5623 ema_index = beacon->mbssid_ies->cnt; 5624 } else { 5625 ema_index = 0; 5626 } 5627 5628 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5629 is_template, beacon, 5630 chanctx_conf, ema_index, 5631 s1g_short_bcn); 5632 } 5633 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5634 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5635 struct ieee80211_hdr *hdr; 5636 5637 beacon = rcu_dereference(ifibss->presp); 5638 if (!beacon) 5639 goto out; 5640 5641 if (beacon->cntdwn_counter_offsets[0]) { 5642 if (!is_template) 5643 __ieee80211_beacon_update_cntdwn(link, beacon); 5644 5645 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5646 } 5647 5648 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5649 local->hw.extra_beacon_tailroom); 5650 if (!skb) 5651 goto out; 5652 skb_reserve(skb, local->tx_headroom); 5653 skb_put_data(skb, beacon->head, beacon->head_len); 5654 5655 hdr = (struct ieee80211_hdr *) skb->data; 5656 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5657 IEEE80211_STYPE_BEACON); 5658 5659 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5660 chanctx_conf, 0); 5661 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5662 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5663 5664 beacon = rcu_dereference(ifmsh->beacon); 5665 if (!beacon) 5666 goto out; 5667 5668 if (beacon->cntdwn_counter_offsets[0]) { 5669 if (!is_template) 5670 /* TODO: For mesh csa_counter is in TU, so 5671 * decrementing it by one isn't correct, but 5672 * for now we leave it consistent with overall 5673 * mac80211's behavior. 5674 */ 5675 __ieee80211_beacon_update_cntdwn(link, beacon); 5676 5677 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5678 } 5679 5680 if (ifmsh->sync_ops) 5681 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5682 5683 skb = dev_alloc_skb(local->tx_headroom + 5684 beacon->head_len + 5685 256 + /* TIM IE */ 5686 beacon->tail_len + 5687 local->hw.extra_beacon_tailroom); 5688 if (!skb) 5689 goto out; 5690 skb_reserve(skb, local->tx_headroom); 5691 skb_put_data(skb, beacon->head, beacon->head_len); 5692 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5693 is_template); 5694 5695 if (offs) { 5696 offs->tim_offset = beacon->head_len; 5697 offs->tim_length = skb->len - beacon->head_len; 5698 } 5699 5700 skb_put_data(skb, beacon->tail, beacon->tail_len); 5701 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5702 chanctx_conf, 0); 5703 } else { 5704 WARN_ON(1); 5705 goto out; 5706 } 5707 5708 out: 5709 rcu_read_unlock(); 5710 return skb; 5711 5712 } 5713 5714 struct sk_buff * 5715 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5716 struct ieee80211_vif *vif, 5717 struct ieee80211_mutable_offsets *offs, 5718 unsigned int link_id) 5719 { 5720 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5721 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5722 } 5723 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5724 5725 struct sk_buff * 5726 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5727 struct ieee80211_vif *vif, 5728 struct ieee80211_mutable_offsets *offs, 5729 unsigned int link_id, u8 ema_index) 5730 { 5731 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5732 NULL); 5733 } 5734 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5735 5736 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5737 { 5738 u8 i; 5739 5740 if (!ema_beacons) 5741 return; 5742 5743 for (i = 0; i < ema_beacons->cnt; i++) 5744 kfree_skb(ema_beacons->bcn[i].skb); 5745 5746 kfree(ema_beacons); 5747 } 5748 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5749 5750 struct ieee80211_ema_beacons * 5751 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5752 struct ieee80211_vif *vif, 5753 unsigned int link_id) 5754 { 5755 struct ieee80211_ema_beacons *ema_beacons = NULL; 5756 5757 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5758 &ema_beacons)); 5759 5760 return ema_beacons; 5761 } 5762 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5763 5764 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5765 struct ieee80211_vif *vif, 5766 u16 *tim_offset, u16 *tim_length, 5767 unsigned int link_id) 5768 { 5769 struct ieee80211_mutable_offsets offs = {}; 5770 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5771 link_id, 5772 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5773 NULL); 5774 struct sk_buff *copy; 5775 5776 if (!bcn) 5777 return bcn; 5778 5779 if (tim_offset) 5780 *tim_offset = offs.tim_offset; 5781 5782 if (tim_length) 5783 *tim_length = offs.tim_length; 5784 5785 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5786 !hw_to_local(hw)->monitors) 5787 return bcn; 5788 5789 /* send a copy to monitor interfaces */ 5790 copy = skb_copy(bcn, GFP_ATOMIC); 5791 if (!copy) 5792 return bcn; 5793 5794 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 5795 5796 return bcn; 5797 } 5798 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5799 5800 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5801 struct ieee80211_vif *vif) 5802 { 5803 struct sk_buff *skb = NULL; 5804 struct probe_resp *presp = NULL; 5805 struct ieee80211_hdr *hdr; 5806 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5807 5808 if (sdata->vif.type != NL80211_IFTYPE_AP) 5809 return NULL; 5810 5811 rcu_read_lock(); 5812 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5813 if (!presp) 5814 goto out; 5815 5816 skb = dev_alloc_skb(presp->len); 5817 if (!skb) 5818 goto out; 5819 5820 skb_put_data(skb, presp->data, presp->len); 5821 5822 hdr = (struct ieee80211_hdr *) skb->data; 5823 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5824 5825 out: 5826 rcu_read_unlock(); 5827 return skb; 5828 } 5829 EXPORT_SYMBOL(ieee80211_proberesp_get); 5830 5831 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5832 struct ieee80211_vif *vif) 5833 { 5834 struct sk_buff *skb = NULL; 5835 struct fils_discovery_data *tmpl = NULL; 5836 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5837 5838 if (sdata->vif.type != NL80211_IFTYPE_AP) 5839 return NULL; 5840 5841 rcu_read_lock(); 5842 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5843 if (!tmpl) { 5844 rcu_read_unlock(); 5845 return NULL; 5846 } 5847 5848 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5849 if (skb) { 5850 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5851 skb_put_data(skb, tmpl->data, tmpl->len); 5852 } 5853 5854 rcu_read_unlock(); 5855 return skb; 5856 } 5857 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5858 5859 struct sk_buff * 5860 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5861 struct ieee80211_vif *vif) 5862 { 5863 struct sk_buff *skb = NULL; 5864 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5865 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5866 5867 if (sdata->vif.type != NL80211_IFTYPE_AP) 5868 return NULL; 5869 5870 rcu_read_lock(); 5871 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5872 if (!tmpl) { 5873 rcu_read_unlock(); 5874 return NULL; 5875 } 5876 5877 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5878 if (skb) { 5879 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5880 skb_put_data(skb, tmpl->data, tmpl->len); 5881 } 5882 5883 rcu_read_unlock(); 5884 return skb; 5885 } 5886 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5887 5888 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5889 struct ieee80211_vif *vif) 5890 { 5891 struct ieee80211_sub_if_data *sdata; 5892 struct ieee80211_pspoll *pspoll; 5893 struct ieee80211_local *local; 5894 struct sk_buff *skb; 5895 5896 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5897 return NULL; 5898 5899 sdata = vif_to_sdata(vif); 5900 local = sdata->local; 5901 5902 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5903 if (!skb) 5904 return NULL; 5905 5906 skb_reserve(skb, local->hw.extra_tx_headroom); 5907 5908 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5909 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5910 IEEE80211_STYPE_PSPOLL); 5911 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5912 5913 /* aid in PS-Poll has its two MSBs each set to 1 */ 5914 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5915 5916 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5917 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5918 5919 return skb; 5920 } 5921 EXPORT_SYMBOL(ieee80211_pspoll_get); 5922 5923 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5924 struct ieee80211_vif *vif, 5925 int link_id, bool qos_ok) 5926 { 5927 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5928 struct ieee80211_local *local = sdata->local; 5929 struct ieee80211_link_data *link = NULL; 5930 struct ieee80211_hdr_3addr *nullfunc; 5931 struct sk_buff *skb; 5932 bool qos = false; 5933 5934 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5935 return NULL; 5936 5937 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5938 sizeof(*nullfunc) + 2); 5939 if (!skb) 5940 return NULL; 5941 5942 rcu_read_lock(); 5943 if (qos_ok) { 5944 struct sta_info *sta; 5945 5946 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5947 qos = sta && sta->sta.wme; 5948 } 5949 5950 if (link_id >= 0) { 5951 link = rcu_dereference(sdata->link[link_id]); 5952 if (WARN_ON_ONCE(!link)) { 5953 rcu_read_unlock(); 5954 kfree_skb(skb); 5955 return NULL; 5956 } 5957 } 5958 5959 skb_reserve(skb, local->hw.extra_tx_headroom); 5960 5961 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5962 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5963 IEEE80211_STYPE_NULLFUNC | 5964 IEEE80211_FCTL_TODS); 5965 if (qos) { 5966 __le16 qoshdr = cpu_to_le16(7); 5967 5968 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5969 IEEE80211_STYPE_NULLFUNC) != 5970 IEEE80211_STYPE_QOS_NULLFUNC); 5971 nullfunc->frame_control |= 5972 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5973 skb->priority = 7; 5974 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5975 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5976 } 5977 5978 if (link) { 5979 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5980 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5981 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5982 } else { 5983 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5984 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5985 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5986 } 5987 rcu_read_unlock(); 5988 5989 return skb; 5990 } 5991 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5992 5993 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5994 const u8 *src_addr, 5995 const u8 *ssid, size_t ssid_len, 5996 size_t tailroom) 5997 { 5998 struct ieee80211_local *local = hw_to_local(hw); 5999 struct ieee80211_hdr_3addr *hdr; 6000 struct sk_buff *skb; 6001 size_t ie_ssid_len; 6002 u8 *pos; 6003 6004 ie_ssid_len = 2 + ssid_len; 6005 6006 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6007 ie_ssid_len + tailroom); 6008 if (!skb) 6009 return NULL; 6010 6011 skb_reserve(skb, local->hw.extra_tx_headroom); 6012 6013 hdr = skb_put_zero(skb, sizeof(*hdr)); 6014 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6015 IEEE80211_STYPE_PROBE_REQ); 6016 eth_broadcast_addr(hdr->addr1); 6017 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6018 eth_broadcast_addr(hdr->addr3); 6019 6020 pos = skb_put(skb, ie_ssid_len); 6021 *pos++ = WLAN_EID_SSID; 6022 *pos++ = ssid_len; 6023 if (ssid_len) 6024 memcpy(pos, ssid, ssid_len); 6025 pos += ssid_len; 6026 6027 return skb; 6028 } 6029 EXPORT_SYMBOL(ieee80211_probereq_get); 6030 6031 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6032 const void *frame, size_t frame_len, 6033 const struct ieee80211_tx_info *frame_txctl, 6034 struct ieee80211_rts *rts) 6035 { 6036 const struct ieee80211_hdr *hdr = frame; 6037 6038 rts->frame_control = 6039 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6040 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6041 frame_txctl); 6042 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6043 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6044 } 6045 EXPORT_SYMBOL(ieee80211_rts_get); 6046 6047 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6048 const void *frame, size_t frame_len, 6049 const struct ieee80211_tx_info *frame_txctl, 6050 struct ieee80211_cts *cts) 6051 { 6052 const struct ieee80211_hdr *hdr = frame; 6053 6054 cts->frame_control = 6055 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6056 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6057 frame_len, frame_txctl); 6058 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6059 } 6060 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6061 6062 struct sk_buff * 6063 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6064 struct ieee80211_vif *vif) 6065 { 6066 struct ieee80211_local *local = hw_to_local(hw); 6067 struct sk_buff *skb = NULL; 6068 struct ieee80211_tx_data tx; 6069 struct ieee80211_sub_if_data *sdata; 6070 struct ps_data *ps; 6071 struct ieee80211_tx_info *info; 6072 struct ieee80211_chanctx_conf *chanctx_conf; 6073 6074 sdata = vif_to_sdata(vif); 6075 6076 rcu_read_lock(); 6077 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6078 6079 if (!chanctx_conf) 6080 goto out; 6081 6082 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6083 struct beacon_data *beacon = 6084 rcu_dereference(sdata->deflink.u.ap.beacon); 6085 6086 if (!beacon || !beacon->head) 6087 goto out; 6088 6089 ps = &sdata->u.ap.ps; 6090 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6091 ps = &sdata->u.mesh.ps; 6092 } else { 6093 goto out; 6094 } 6095 6096 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6097 goto out; /* send buffered bc/mc only after DTIM beacon */ 6098 6099 while (1) { 6100 skb = skb_dequeue(&ps->bc_buf); 6101 if (!skb) 6102 goto out; 6103 local->total_ps_buffered--; 6104 6105 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6106 struct ieee80211_hdr *hdr = 6107 (struct ieee80211_hdr *) skb->data; 6108 /* more buffered multicast/broadcast frames ==> set 6109 * MoreData flag in IEEE 802.11 header to inform PS 6110 * STAs */ 6111 hdr->frame_control |= 6112 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6113 } 6114 6115 if (sdata->vif.type == NL80211_IFTYPE_AP) 6116 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6117 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6118 break; 6119 ieee80211_free_txskb(hw, skb); 6120 } 6121 6122 info = IEEE80211_SKB_CB(skb); 6123 6124 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6125 info->band = chanctx_conf->def.chan->band; 6126 6127 if (invoke_tx_handlers(&tx)) 6128 skb = NULL; 6129 out: 6130 rcu_read_unlock(); 6131 6132 return skb; 6133 } 6134 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6135 6136 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6137 { 6138 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6139 struct ieee80211_sub_if_data *sdata = sta->sdata; 6140 struct ieee80211_local *local = sdata->local; 6141 int ret; 6142 u32 queues; 6143 6144 lockdep_assert_wiphy(local->hw.wiphy); 6145 6146 /* only some cases are supported right now */ 6147 switch (sdata->vif.type) { 6148 case NL80211_IFTYPE_STATION: 6149 case NL80211_IFTYPE_AP: 6150 case NL80211_IFTYPE_AP_VLAN: 6151 break; 6152 default: 6153 WARN_ON(1); 6154 return -EINVAL; 6155 } 6156 6157 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6158 return -EINVAL; 6159 6160 if (sta->reserved_tid == tid) { 6161 ret = 0; 6162 goto out; 6163 } 6164 6165 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6166 sdata_err(sdata, "TID reservation already active\n"); 6167 ret = -EALREADY; 6168 goto out; 6169 } 6170 6171 ieee80211_stop_vif_queues(sdata->local, sdata, 6172 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6173 6174 synchronize_net(); 6175 6176 /* Tear down BA sessions so we stop aggregating on this TID */ 6177 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6178 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6179 __ieee80211_stop_tx_ba_session(sta, tid, 6180 AGG_STOP_LOCAL_REQUEST); 6181 } 6182 6183 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6184 __ieee80211_flush_queues(local, sdata, queues, false); 6185 6186 sta->reserved_tid = tid; 6187 6188 ieee80211_wake_vif_queues(local, sdata, 6189 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6190 6191 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6192 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6193 6194 ret = 0; 6195 out: 6196 return ret; 6197 } 6198 EXPORT_SYMBOL(ieee80211_reserve_tid); 6199 6200 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6201 { 6202 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6203 struct ieee80211_sub_if_data *sdata = sta->sdata; 6204 6205 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6206 6207 /* only some cases are supported right now */ 6208 switch (sdata->vif.type) { 6209 case NL80211_IFTYPE_STATION: 6210 case NL80211_IFTYPE_AP: 6211 case NL80211_IFTYPE_AP_VLAN: 6212 break; 6213 default: 6214 WARN_ON(1); 6215 return; 6216 } 6217 6218 if (tid != sta->reserved_tid) { 6219 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6220 return; 6221 } 6222 6223 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6224 } 6225 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6226 6227 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6228 struct sk_buff *skb, int tid, int link_id, 6229 enum nl80211_band band) 6230 { 6231 const struct ieee80211_hdr *hdr = (void *)skb->data; 6232 int ac = ieee80211_ac_from_tid(tid); 6233 unsigned int link; 6234 6235 skb_reset_mac_header(skb); 6236 skb_set_queue_mapping(skb, ac); 6237 skb->priority = tid; 6238 6239 skb->dev = sdata->dev; 6240 6241 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6242 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6243 IEEE80211_LINK_UNSPECIFIED)); 6244 6245 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6246 link = 0; 6247 } else if (link_id >= 0) { 6248 link = link_id; 6249 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6250 /* address from the MLD */ 6251 link = IEEE80211_LINK_UNSPECIFIED; 6252 } else { 6253 /* otherwise must be addressed from a link */ 6254 rcu_read_lock(); 6255 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6256 struct ieee80211_bss_conf *link_conf; 6257 6258 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6259 if (!link_conf) 6260 continue; 6261 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6262 break; 6263 } 6264 rcu_read_unlock(); 6265 6266 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6267 link = ffs(sdata->vif.active_links) - 1; 6268 } 6269 6270 IEEE80211_SKB_CB(skb)->control.flags |= 6271 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6272 6273 /* 6274 * The other path calling ieee80211_xmit is from the tasklet, 6275 * and while we can handle concurrent transmissions locking 6276 * requirements are that we do not come into tx with bhs on. 6277 */ 6278 local_bh_disable(); 6279 IEEE80211_SKB_CB(skb)->band = band; 6280 ieee80211_xmit(sdata, NULL, skb); 6281 local_bh_enable(); 6282 } 6283 6284 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6285 struct sk_buff *skb, int tid, int link_id) 6286 { 6287 struct ieee80211_chanctx_conf *chanctx_conf; 6288 enum nl80211_band band; 6289 6290 rcu_read_lock(); 6291 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6292 WARN_ON(link_id >= 0); 6293 chanctx_conf = 6294 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6295 if (WARN_ON(!chanctx_conf)) { 6296 rcu_read_unlock(); 6297 kfree_skb(skb); 6298 return; 6299 } 6300 band = chanctx_conf->def.chan->band; 6301 } else { 6302 WARN_ON(link_id >= 0 && 6303 !(sdata->vif.active_links & BIT(link_id))); 6304 /* MLD transmissions must not rely on the band */ 6305 band = 0; 6306 } 6307 6308 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6309 rcu_read_unlock(); 6310 } 6311 6312 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6313 const u8 *buf, size_t len, 6314 const u8 *dest, __be16 proto, bool unencrypted, 6315 int link_id, u64 *cookie) 6316 { 6317 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6318 struct ieee80211_local *local = sdata->local; 6319 struct sta_info *sta; 6320 struct sk_buff *skb; 6321 struct ethhdr *ehdr; 6322 u32 ctrl_flags = 0; 6323 u32 flags = 0; 6324 int err; 6325 6326 /* mutex lock is only needed for incrementing the cookie counter */ 6327 lockdep_assert_wiphy(local->hw.wiphy); 6328 6329 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6330 * or Pre-Authentication 6331 */ 6332 if (proto != sdata->control_port_protocol && 6333 proto != cpu_to_be16(ETH_P_PREAUTH)) 6334 return -EINVAL; 6335 6336 if (proto == sdata->control_port_protocol) 6337 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6338 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6339 6340 if (unencrypted) 6341 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6342 6343 if (cookie) 6344 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6345 6346 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6347 6348 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6349 sizeof(struct ethhdr) + len); 6350 if (!skb) 6351 return -ENOMEM; 6352 6353 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6354 6355 skb_put_data(skb, buf, len); 6356 6357 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6358 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6359 6360 /* we may override the SA for MLO STA later */ 6361 if (link_id < 0) { 6362 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6363 IEEE80211_TX_CTRL_MLO_LINK); 6364 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6365 } else { 6366 struct ieee80211_bss_conf *link_conf; 6367 6368 ctrl_flags |= u32_encode_bits(link_id, 6369 IEEE80211_TX_CTRL_MLO_LINK); 6370 6371 rcu_read_lock(); 6372 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6373 if (!link_conf) { 6374 dev_kfree_skb(skb); 6375 rcu_read_unlock(); 6376 return -ENOLINK; 6377 } 6378 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6379 rcu_read_unlock(); 6380 } 6381 6382 ehdr->h_proto = proto; 6383 6384 skb->dev = dev; 6385 skb->protocol = proto; 6386 skb_reset_network_header(skb); 6387 skb_reset_mac_header(skb); 6388 6389 if (local->hw.queues < IEEE80211_NUM_ACS) 6390 goto start_xmit; 6391 6392 /* update QoS header to prioritize control port frames if possible, 6393 * prioritization also happens for control port frames send over 6394 * AF_PACKET 6395 */ 6396 rcu_read_lock(); 6397 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6398 if (err) { 6399 dev_kfree_skb(skb); 6400 rcu_read_unlock(); 6401 return err; 6402 } 6403 6404 if (!IS_ERR(sta)) { 6405 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6406 6407 skb_set_queue_mapping(skb, queue); 6408 6409 /* 6410 * for MLO STA, the SA should be the AP MLD address, but 6411 * the link ID has been selected already 6412 */ 6413 if (sta && sta->sta.mlo) 6414 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6415 } 6416 rcu_read_unlock(); 6417 6418 start_xmit: 6419 local_bh_disable(); 6420 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6421 local_bh_enable(); 6422 6423 return 0; 6424 } 6425 6426 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6427 const u8 *buf, size_t len) 6428 { 6429 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6430 struct ieee80211_local *local = sdata->local; 6431 struct sk_buff *skb; 6432 6433 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6434 30 + /* header size */ 6435 18); /* 11s header size */ 6436 if (!skb) 6437 return -ENOMEM; 6438 6439 skb_reserve(skb, local->hw.extra_tx_headroom); 6440 skb_put_data(skb, buf, len); 6441 6442 skb->dev = dev; 6443 skb->protocol = htons(ETH_P_802_3); 6444 skb_reset_network_header(skb); 6445 skb_reset_mac_header(skb); 6446 6447 local_bh_disable(); 6448 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6449 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6450 NULL); 6451 local_bh_enable(); 6452 6453 return 0; 6454 } 6455