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 if (info->band >= NUM_NL80211_BANDS) 63 return 0; 64 65 sband = local->hw.wiphy->bands[info->band]; 66 txrate = &sband->bitrates[tx->rate.idx]; 67 68 erp = txrate->flags & IEEE80211_RATE_ERP_G; 69 70 /* device is expected to do this */ 71 if (sband->band == NL80211_BAND_S1GHZ) 72 return 0; 73 74 /* 75 * data and mgmt (except PS Poll): 76 * - during CFP: 32768 77 * - during contention period: 78 * if addr1 is group address: 0 79 * if more fragments = 0 and addr1 is individual address: time to 80 * transmit one ACK plus SIFS 81 * if more fragments = 1 and addr1 is individual address: time to 82 * transmit next fragment plus 2 x ACK plus 3 x SIFS 83 * 84 * IEEE 802.11, 9.6: 85 * - control response frame (CTS or ACK) shall be transmitted using the 86 * same rate as the immediately previous frame in the frame exchange 87 * sequence, if this rate belongs to the PHY mandatory rates, or else 88 * at the highest possible rate belonging to the PHY rates in the 89 * BSSBasicRateSet 90 */ 91 hdr = (struct ieee80211_hdr *)skb->data; 92 if (ieee80211_is_ctl(hdr->frame_control)) { 93 /* TODO: These control frames are not currently sent by 94 * mac80211, but should they be implemented, this function 95 * needs to be updated to support duration field calculation. 96 * 97 * RTS: time needed to transmit pending data/mgmt frame plus 98 * one CTS frame plus one ACK frame plus 3 x SIFS 99 * CTS: duration of immediately previous RTS minus time 100 * required to transmit CTS and its SIFS 101 * ACK: 0 if immediately previous directed data/mgmt had 102 * more=0, with more=1 duration in ACK frame is duration 103 * from previous frame minus time needed to transmit ACK 104 * and its SIFS 105 * PS Poll: BIT(15) | BIT(14) | aid 106 */ 107 return 0; 108 } 109 110 /* data/mgmt */ 111 if (0 /* FIX: data/mgmt during CFP */) 112 return cpu_to_le16(32768); 113 114 if (group_addr) /* Group address as the destination - no ACK */ 115 return 0; 116 117 /* Individual destination address: 118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 119 * CTS and ACK frames shall be transmitted using the highest rate in 120 * basic rate set that is less than or equal to the rate of the 121 * immediately previous frame and that is using the same modulation 122 * (CCK or OFDM). If no basic rate set matches with these requirements, 123 * the highest mandatory rate of the PHY that is less than or equal to 124 * the rate of the previous frame is used. 125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 126 */ 127 rate = -1; 128 /* use lowest available if everything fails */ 129 mrate = sband->bitrates[0].bitrate; 130 for (i = 0; i < sband->n_bitrates; i++) { 131 struct ieee80211_rate *r = &sband->bitrates[i]; 132 u32 flag; 133 134 if (r->bitrate > txrate->bitrate) 135 break; 136 137 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 138 rate = r->bitrate; 139 140 switch (sband->band) { 141 case NL80211_BAND_2GHZ: 142 case NL80211_BAND_LC: 143 if (tx->sdata->deflink.operating_11g_mode) 144 flag = IEEE80211_RATE_MANDATORY_G; 145 else 146 flag = IEEE80211_RATE_MANDATORY_B; 147 break; 148 case NL80211_BAND_5GHZ: 149 case NL80211_BAND_6GHZ: 150 flag = IEEE80211_RATE_MANDATORY_A; 151 break; 152 default: 153 flag = 0; 154 WARN_ON(1); 155 break; 156 } 157 158 if (r->flags & flag) 159 mrate = r->bitrate; 160 } 161 if (rate == -1) { 162 /* No matching basic rate found; use highest suitable mandatory 163 * PHY rate */ 164 rate = mrate; 165 } 166 167 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 168 if (ieee80211_is_data_qos(hdr->frame_control) && 169 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 170 dur = 0; 171 else 172 /* Time needed to transmit ACK 173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 174 * to closest integer */ 175 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 176 tx->sdata->vif.bss_conf.use_short_preamble); 177 178 if (next_frag_len) { 179 /* Frame is fragmented: duration increases with time needed to 180 * transmit next fragment plus ACK and 2 x SIFS. */ 181 dur *= 2; /* ACK + SIFS */ 182 /* next fragment */ 183 dur += ieee80211_frame_duration(sband->band, next_frag_len, 184 txrate->bitrate, erp, 185 tx->sdata->vif.bss_conf.use_short_preamble); 186 } 187 188 return cpu_to_le16(dur); 189 } 190 191 /* tx handlers */ 192 static ieee80211_tx_result debug_noinline 193 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 194 { 195 struct ieee80211_local *local = tx->local; 196 struct ieee80211_if_managed *ifmgd; 197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 198 199 /* driver doesn't support power save */ 200 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 201 return TX_CONTINUE; 202 203 /* hardware does dynamic power save */ 204 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 205 return TX_CONTINUE; 206 207 /* dynamic power save disabled */ 208 if (local->hw.conf.dynamic_ps_timeout <= 0) 209 return TX_CONTINUE; 210 211 /* we are scanning, don't enable power save */ 212 if (local->scanning) 213 return TX_CONTINUE; 214 215 if (!local->ps_sdata) 216 return TX_CONTINUE; 217 218 /* No point if we're going to suspend */ 219 if (local->quiescing) 220 return TX_CONTINUE; 221 222 /* dynamic ps is supported only in managed mode */ 223 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 224 return TX_CONTINUE; 225 226 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 227 return TX_CONTINUE; 228 229 ifmgd = &tx->sdata->u.mgd; 230 231 /* 232 * Don't wakeup from power save if u-apsd is enabled, voip ac has 233 * u-apsd enabled and the frame is in voip class. This effectively 234 * means that even if all access categories have u-apsd enabled, in 235 * practise u-apsd is only used with the voip ac. This is a 236 * workaround for the case when received voip class packets do not 237 * have correct qos tag for some reason, due the network or the 238 * peer application. 239 * 240 * Note: ifmgd->uapsd_queues access is racy here. If the value is 241 * changed via debugfs, user needs to reassociate manually to have 242 * everything in sync. 243 */ 244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 247 return TX_CONTINUE; 248 249 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 250 ieee80211_stop_queues_by_reason(&local->hw, 251 IEEE80211_MAX_QUEUE_MAP, 252 IEEE80211_QUEUE_STOP_REASON_PS, 253 false); 254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 255 wiphy_work_queue(local->hw.wiphy, 256 &local->dynamic_ps_disable_work); 257 } 258 259 /* Don't restart the timer if we're not disassociated */ 260 if (!ifmgd->associated) 261 return TX_CONTINUE; 262 263 mod_timer(&local->dynamic_ps_timer, jiffies + 264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 265 266 return TX_CONTINUE; 267 } 268 269 static ieee80211_tx_result debug_noinline 270 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 271 { 272 273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 275 bool assoc = false; 276 277 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 278 return TX_CONTINUE; 279 280 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 281 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 282 !ieee80211_is_probe_req(hdr->frame_control) && 283 !ieee80211_is_any_nullfunc(hdr->frame_control)) 284 /* 285 * When software scanning only nullfunc frames (to notify 286 * the sleep state to the AP) and probe requests (for the 287 * active scan) are allowed, all other frames should not be 288 * sent and we should not get here, but if we do 289 * nonetheless, drop them to avoid sending them 290 * off-channel. See the link below and 291 * ieee80211_start_scan() for more. 292 * 293 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 294 */ 295 return TX_DROP; 296 297 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 298 return TX_CONTINUE; 299 300 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 301 return TX_CONTINUE; 302 303 if (tx->sta) 304 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 305 306 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 307 if (unlikely(!assoc && 308 ieee80211_is_data(hdr->frame_control))) { 309 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 310 sdata_info(tx->sdata, 311 "dropped data frame to not associated station %pM\n", 312 hdr->addr1); 313 #endif 314 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 315 return TX_DROP; 316 } 317 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 318 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 319 /* 320 * No associated STAs - no need to send multicast 321 * frames. 322 */ 323 return TX_DROP; 324 } 325 326 return TX_CONTINUE; 327 } 328 329 /* This function is called whenever the AP is about to exceed the maximum limit 330 * of buffered frames for power saving STAs. This situation should not really 331 * happen often during normal operation, so dropping the oldest buffered packet 332 * from each queue should be OK to make some room for new frames. */ 333 static void purge_old_ps_buffers(struct ieee80211_local *local) 334 { 335 int total = 0, purged = 0; 336 struct sk_buff *skb; 337 struct ieee80211_sub_if_data *sdata; 338 struct sta_info *sta; 339 340 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 341 struct ps_data *ps; 342 343 if (sdata->vif.type == NL80211_IFTYPE_AP) 344 ps = &sdata->u.ap.ps; 345 else if (ieee80211_vif_is_mesh(&sdata->vif)) 346 ps = &sdata->u.mesh.ps; 347 else 348 continue; 349 350 skb = skb_dequeue(&ps->bc_buf); 351 if (skb) { 352 purged++; 353 ieee80211_free_txskb(&local->hw, skb); 354 } 355 total += skb_queue_len(&ps->bc_buf); 356 } 357 358 /* 359 * Drop one frame from each station from the lowest-priority 360 * AC that has frames at all. 361 */ 362 list_for_each_entry_rcu(sta, &local->sta_list, list) { 363 int ac; 364 365 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 366 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 367 total += skb_queue_len(&sta->ps_tx_buf[ac]); 368 if (skb) { 369 purged++; 370 ieee80211_free_txskb(&local->hw, skb); 371 break; 372 } 373 } 374 } 375 376 local->total_ps_buffered = total; 377 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 378 } 379 380 static ieee80211_tx_result 381 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 382 { 383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 384 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 385 struct ps_data *ps; 386 387 /* 388 * broadcast/multicast frame 389 * 390 * If any of the associated/peer stations is in power save mode, 391 * the frame is buffered to be sent after DTIM beacon frame. 392 * This is done either by the hardware or us. 393 */ 394 395 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 396 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 397 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 398 if (!tx->sdata->bss) 399 return TX_CONTINUE; 400 401 ps = &tx->sdata->bss->ps; 402 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 403 ps = &tx->sdata->u.mesh.ps; 404 } else { 405 return TX_CONTINUE; 406 } 407 408 409 /* no buffering for ordered frames */ 410 if (ieee80211_has_order(hdr->frame_control)) 411 return TX_CONTINUE; 412 413 if (ieee80211_is_probe_req(hdr->frame_control)) 414 return TX_CONTINUE; 415 416 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 417 info->hw_queue = tx->sdata->vif.cab_queue; 418 419 /* no stations in PS mode and no buffered packets */ 420 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 421 return TX_CONTINUE; 422 423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 424 425 /* device releases frame after DTIM beacon */ 426 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 427 return TX_CONTINUE; 428 429 /* buffered in mac80211 */ 430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 431 purge_old_ps_buffers(tx->local); 432 433 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 434 ps_dbg(tx->sdata, 435 "BC TX buffer full - dropping the oldest frame\n"); 436 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 437 } else 438 tx->local->total_ps_buffered++; 439 440 skb_queue_tail(&ps->bc_buf, tx->skb); 441 442 return TX_QUEUED; 443 } 444 445 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 446 struct sk_buff *skb) 447 { 448 if (!ieee80211_is_mgmt(fc)) 449 return 0; 450 451 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 452 return 0; 453 454 if (!ieee80211_is_robust_mgmt_frame(skb)) 455 return 0; 456 457 return 1; 458 } 459 460 static ieee80211_tx_result 461 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 462 { 463 struct sta_info *sta = tx->sta; 464 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 465 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 466 struct ieee80211_local *local = tx->local; 467 468 if (unlikely(!sta)) 469 return TX_CONTINUE; 470 471 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 472 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 473 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 474 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 475 int ac = skb_get_queue_mapping(tx->skb); 476 477 if (ieee80211_is_mgmt(hdr->frame_control) && 478 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 479 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 480 return TX_CONTINUE; 481 } 482 483 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 484 sta->sta.addr, sta->sta.aid, ac); 485 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 486 purge_old_ps_buffers(tx->local); 487 488 /* sync with ieee80211_sta_ps_deliver_wakeup */ 489 spin_lock(&sta->ps_lock); 490 /* 491 * STA woke up the meantime and all the frames on ps_tx_buf have 492 * been queued to pending queue. No reordering can happen, go 493 * ahead and Tx the packet. 494 */ 495 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 496 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 497 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 498 spin_unlock(&sta->ps_lock); 499 return TX_CONTINUE; 500 } 501 502 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 503 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 504 ps_dbg(tx->sdata, 505 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 506 sta->sta.addr, ac); 507 ieee80211_free_txskb(&local->hw, old); 508 } else 509 tx->local->total_ps_buffered++; 510 511 info->control.jiffies = jiffies; 512 info->control.vif = &tx->sdata->vif; 513 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 514 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 515 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 516 spin_unlock(&sta->ps_lock); 517 518 if (!timer_pending(&local->sta_cleanup)) 519 mod_timer(&local->sta_cleanup, 520 round_jiffies(jiffies + 521 STA_INFO_CLEANUP_INTERVAL)); 522 523 /* 524 * We queued up some frames, so the TIM bit might 525 * need to be set, recalculate it. 526 */ 527 sta_info_recalc_tim(sta); 528 529 return TX_QUEUED; 530 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 531 ps_dbg(tx->sdata, 532 "STA %pM in PS mode, but polling/in SP -> send frame\n", 533 sta->sta.addr); 534 } 535 536 return TX_CONTINUE; 537 } 538 539 static ieee80211_tx_result debug_noinline 540 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 541 { 542 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 543 return TX_CONTINUE; 544 545 if (tx->flags & IEEE80211_TX_UNICAST) 546 return ieee80211_tx_h_unicast_ps_buf(tx); 547 else 548 return ieee80211_tx_h_multicast_ps_buf(tx); 549 } 550 551 static ieee80211_tx_result debug_noinline 552 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 553 { 554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 555 556 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 557 if (tx->sdata->control_port_no_encrypt) 558 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 559 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 560 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 561 } 562 563 return TX_CONTINUE; 564 } 565 566 static struct ieee80211_key * 567 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 568 { 569 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 570 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 571 struct ieee80211_link_data *link; 572 unsigned int link_id; 573 574 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 575 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 576 link = &tx->sdata->deflink; 577 } else { 578 link = rcu_dereference(tx->sdata->link[link_id]); 579 if (!link) 580 return NULL; 581 } 582 583 if (ieee80211_is_group_privacy_action(tx->skb)) 584 return rcu_dereference(link->default_multicast_key); 585 else if (ieee80211_is_mgmt(hdr->frame_control) && 586 is_multicast_ether_addr(hdr->addr1) && 587 ieee80211_is_robust_mgmt_frame(tx->skb)) 588 return rcu_dereference(link->default_mgmt_key); 589 else if (is_multicast_ether_addr(hdr->addr1)) 590 return rcu_dereference(link->default_multicast_key); 591 592 return NULL; 593 } 594 595 static ieee80211_tx_result debug_noinline 596 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 597 { 598 struct ieee80211_key *key; 599 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 601 602 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 603 tx->key = NULL; 604 return TX_CONTINUE; 605 } 606 607 if (tx->sta && 608 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 609 tx->key = key; 610 else if ((key = ieee80211_select_link_key(tx))) 611 tx->key = key; 612 else if (!is_multicast_ether_addr(hdr->addr1) && 613 (key = rcu_dereference(tx->sdata->default_unicast_key))) 614 tx->key = key; 615 else 616 tx->key = NULL; 617 618 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 619 if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 620 info->control.hw_key = &tx->key->conf; 621 return TX_CONTINUE; 622 } 623 624 if (tx->key) { 625 bool skip_hw = false; 626 627 /* TODO: add threshold stuff again */ 628 629 switch (tx->key->conf.cipher) { 630 case WLAN_CIPHER_SUITE_WEP40: 631 case WLAN_CIPHER_SUITE_WEP104: 632 case WLAN_CIPHER_SUITE_TKIP: 633 if (!ieee80211_is_data_present(hdr->frame_control)) 634 tx->key = NULL; 635 break; 636 case WLAN_CIPHER_SUITE_CCMP: 637 case WLAN_CIPHER_SUITE_CCMP_256: 638 case WLAN_CIPHER_SUITE_GCMP: 639 case WLAN_CIPHER_SUITE_GCMP_256: 640 if (!ieee80211_is_data_present(hdr->frame_control) && 641 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 642 tx->skb) && 643 !ieee80211_is_group_privacy_action(tx->skb) && 644 !ieee80211_require_encrypted_assoc(hdr->frame_control, 645 tx->sta)) 646 tx->key = NULL; 647 else 648 skip_hw = (tx->key->conf.flags & 649 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 650 ieee80211_is_mgmt(hdr->frame_control); 651 break; 652 case WLAN_CIPHER_SUITE_AES_CMAC: 653 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 654 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 655 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 656 if (!ieee80211_is_mgmt(hdr->frame_control)) 657 tx->key = NULL; 658 break; 659 } 660 661 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 662 !ieee80211_is_deauth(hdr->frame_control)) && 663 tx->skb->protocol != tx->sdata->control_port_protocol) 664 return TX_DROP; 665 666 if (!skip_hw && tx->key && 667 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 668 info->control.hw_key = &tx->key->conf; 669 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 670 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 671 return TX_DROP; 672 } 673 674 return TX_CONTINUE; 675 } 676 677 static ieee80211_tx_result debug_noinline 678 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 679 { 680 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 681 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 682 struct ieee80211_supported_band *sband; 683 u32 len; 684 struct ieee80211_tx_rate_control txrc; 685 struct ieee80211_sta_rates *ratetbl = NULL; 686 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 687 bool assoc = false; 688 689 memset(&txrc, 0, sizeof(txrc)); 690 691 if (info->band < NUM_NL80211_BANDS) 692 sband = tx->local->hw.wiphy->bands[info->band]; 693 else 694 return TX_CONTINUE; 695 696 len = min_t(u32, tx->skb->len + FCS_LEN, 697 tx->local->hw.wiphy->frag_threshold); 698 699 /* set up the tx rate control struct we give the RC algo */ 700 txrc.hw = &tx->local->hw; 701 txrc.sband = sband; 702 txrc.bss_conf = &tx->sdata->vif.bss_conf; 703 txrc.skb = tx->skb; 704 txrc.reported_rate.idx = -1; 705 706 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 707 txrc.rate_idx_mask = ~0; 708 } else { 709 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 710 711 if (tx->sdata->rc_has_mcs_mask[info->band]) 712 txrc.rate_idx_mcs_mask = 713 tx->sdata->rc_rateidx_mcs_mask[info->band]; 714 } 715 716 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 717 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 718 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 719 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 720 721 /* set up RTS protection if desired */ 722 if (len > tx->local->hw.wiphy->rts_threshold) { 723 txrc.rts = true; 724 } 725 726 info->control.use_rts = txrc.rts; 727 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 728 729 /* 730 * Use short preamble if the BSS can handle it, but not for 731 * management frames unless we know the receiver can handle 732 * that -- the management frame might be to a station that 733 * just wants a probe response. 734 */ 735 if (tx->sdata->vif.bss_conf.use_short_preamble && 736 (ieee80211_is_tx_data(tx->skb) || 737 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 738 txrc.short_preamble = true; 739 740 info->control.short_preamble = txrc.short_preamble; 741 742 /* don't ask rate control when rate already injected via radiotap */ 743 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 744 return TX_CONTINUE; 745 746 if (tx->sta) 747 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 748 749 /* 750 * Lets not bother rate control if we're associated and cannot 751 * talk to the sta. This should not happen. 752 */ 753 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 754 !rate_usable_index_exists(sband, &tx->sta->sta), 755 "%s: Dropped data frame as no usable bitrate found while " 756 "scanning and associated. Target station: " 757 "%pM on %d GHz band\n", 758 tx->sdata->name, 759 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 760 info->band ? 5 : 2)) 761 return TX_DROP; 762 763 /* 764 * If we're associated with the sta at this point we know we can at 765 * least send the frame at the lowest bit rate. 766 */ 767 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 768 769 if (tx->sta && !info->control.skip_table) 770 ratetbl = rcu_dereference(tx->sta->sta.rates); 771 772 if (unlikely(info->control.rates[0].idx < 0)) { 773 if (ratetbl) { 774 struct ieee80211_tx_rate rate = { 775 .idx = ratetbl->rate[0].idx, 776 .flags = ratetbl->rate[0].flags, 777 .count = ratetbl->rate[0].count 778 }; 779 780 if (ratetbl->rate[0].idx < 0) 781 return TX_DROP; 782 783 tx->rate = rate; 784 } else { 785 return TX_DROP; 786 } 787 } else { 788 tx->rate = info->control.rates[0]; 789 } 790 791 if (txrc.reported_rate.idx < 0) { 792 txrc.reported_rate = tx->rate; 793 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 794 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 795 } else if (tx->sta) 796 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 797 798 if (ratetbl) 799 return TX_CONTINUE; 800 801 if (unlikely(!info->control.rates[0].count)) 802 info->control.rates[0].count = 1; 803 804 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 805 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 806 info->control.rates[0].count = 1; 807 808 return TX_CONTINUE; 809 } 810 811 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 812 { 813 u16 *seq = &sta->tid_seq[tid]; 814 __le16 ret = cpu_to_le16(*seq); 815 816 /* Increase the sequence number. */ 817 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 818 819 return ret; 820 } 821 822 static ieee80211_tx_result debug_noinline 823 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 824 { 825 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 826 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 827 int tid; 828 829 /* 830 * Packet injection may want to control the sequence 831 * number, if we have no matching interface then we 832 * neither assign one ourselves nor ask the driver to. 833 */ 834 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 835 return TX_CONTINUE; 836 837 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 838 return TX_CONTINUE; 839 840 if (ieee80211_hdrlen(hdr->frame_control) < 24) 841 return TX_CONTINUE; 842 843 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 844 return TX_CONTINUE; 845 846 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 847 return TX_CONTINUE; 848 849 /* SNS11 from 802.11be 10.3.2.14 */ 850 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 851 ieee80211_vif_is_mld(info->control.vif) && 852 info->control.vif->type == NL80211_IFTYPE_AP)) { 853 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 854 tx->sdata->mld_mcast_seq += 0x10; 855 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 856 return TX_CONTINUE; 857 } 858 859 /* 860 * Anything but QoS data that has a sequence number field 861 * (is long enough) gets a sequence number from the global 862 * counter. QoS data frames with a multicast destination 863 * also use the global counter (802.11-2012 9.3.2.10). 864 */ 865 if (!ieee80211_is_data_qos(hdr->frame_control) || 866 is_multicast_ether_addr(hdr->addr1)) { 867 /* driver should assign sequence number */ 868 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 869 /* for pure STA mode without beacons, we can do it */ 870 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 871 tx->sdata->sequence_number += 0x10; 872 if (tx->sta) 873 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 874 return TX_CONTINUE; 875 } 876 877 /* 878 * This should be true for injected/management frames only, for 879 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 880 * above since they are not QoS-data frames. 881 */ 882 if (!tx->sta) 883 return TX_CONTINUE; 884 885 /* include per-STA, per-TID sequence counter */ 886 tid = ieee80211_get_tid(hdr); 887 tx->sta->deflink.tx_stats.msdu[tid]++; 888 889 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 890 891 return TX_CONTINUE; 892 } 893 894 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 895 struct sk_buff *skb, int hdrlen, 896 int frag_threshold) 897 { 898 struct ieee80211_local *local = tx->local; 899 struct ieee80211_tx_info *info; 900 struct sk_buff *tmp; 901 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 902 int pos = hdrlen + per_fragm; 903 int rem = skb->len - hdrlen - per_fragm; 904 905 if (WARN_ON(rem < 0)) 906 return -EINVAL; 907 908 /* first fragment was already added to queue by caller */ 909 910 while (rem) { 911 int fraglen = per_fragm; 912 913 if (fraglen > rem) 914 fraglen = rem; 915 rem -= fraglen; 916 tmp = dev_alloc_skb(local->tx_headroom + 917 frag_threshold + 918 IEEE80211_ENCRYPT_HEADROOM + 919 IEEE80211_ENCRYPT_TAILROOM); 920 if (!tmp) 921 return -ENOMEM; 922 923 __skb_queue_tail(&tx->skbs, tmp); 924 925 skb_reserve(tmp, 926 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 927 928 /* copy control information */ 929 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 930 931 info = IEEE80211_SKB_CB(tmp); 932 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 933 IEEE80211_TX_CTL_FIRST_FRAGMENT); 934 935 if (rem) 936 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 937 938 skb_copy_queue_mapping(tmp, skb); 939 tmp->priority = skb->priority; 940 tmp->dev = skb->dev; 941 942 /* copy header and data */ 943 skb_put_data(tmp, skb->data, hdrlen); 944 skb_put_data(tmp, skb->data + pos, fraglen); 945 946 pos += fraglen; 947 } 948 949 /* adjust first fragment's length */ 950 skb_trim(skb, hdrlen + per_fragm); 951 return 0; 952 } 953 954 static ieee80211_tx_result debug_noinline 955 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 956 { 957 struct sk_buff *skb = tx->skb; 958 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 959 struct ieee80211_hdr *hdr = (void *)skb->data; 960 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 961 int hdrlen; 962 int fragnum; 963 964 /* no matter what happens, tx->skb moves to tx->skbs */ 965 __skb_queue_tail(&tx->skbs, skb); 966 tx->skb = NULL; 967 968 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 969 return TX_CONTINUE; 970 971 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 972 return TX_CONTINUE; 973 974 /* 975 * Warn when submitting a fragmented A-MPDU frame and drop it. 976 * This scenario is handled in ieee80211_tx_prepare but extra 977 * caution taken here as fragmented ampdu may cause Tx stop. 978 */ 979 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 980 return TX_DROP; 981 982 hdrlen = ieee80211_hdrlen(hdr->frame_control); 983 984 /* internal error, why isn't DONTFRAG set? */ 985 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 986 return TX_DROP; 987 988 /* 989 * Now fragment the frame. This will allocate all the fragments and 990 * chain them (using skb as the first fragment) to skb->next. 991 * During transmission, we will remove the successfully transmitted 992 * fragments from this list. When the low-level driver rejects one 993 * of the fragments then we will simply pretend to accept the skb 994 * but store it away as pending. 995 */ 996 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 997 return TX_DROP; 998 999 /* update duration/seq/flags of fragments */ 1000 fragnum = 0; 1001 1002 skb_queue_walk(&tx->skbs, skb) { 1003 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1004 1005 hdr = (void *)skb->data; 1006 info = IEEE80211_SKB_CB(skb); 1007 1008 if (!skb_queue_is_last(&tx->skbs, skb)) { 1009 hdr->frame_control |= morefrags; 1010 /* 1011 * No multi-rate retries for fragmented frames, that 1012 * would completely throw off the NAV at other STAs. 1013 */ 1014 info->control.rates[1].idx = -1; 1015 info->control.rates[2].idx = -1; 1016 info->control.rates[3].idx = -1; 1017 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1018 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1019 } else { 1020 hdr->frame_control &= ~morefrags; 1021 } 1022 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1023 fragnum++; 1024 } 1025 1026 return TX_CONTINUE; 1027 } 1028 1029 static ieee80211_tx_result debug_noinline 1030 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1031 { 1032 struct sk_buff *skb; 1033 int ac = -1; 1034 1035 if (!tx->sta) 1036 return TX_CONTINUE; 1037 1038 skb_queue_walk(&tx->skbs, skb) { 1039 ac = skb_get_queue_mapping(skb); 1040 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1041 } 1042 if (ac >= 0) 1043 tx->sta->deflink.tx_stats.packets[ac]++; 1044 1045 return TX_CONTINUE; 1046 } 1047 1048 static ieee80211_tx_result debug_noinline 1049 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1050 { 1051 if (!tx->key) 1052 return TX_CONTINUE; 1053 1054 switch (tx->key->conf.cipher) { 1055 case WLAN_CIPHER_SUITE_WEP40: 1056 case WLAN_CIPHER_SUITE_WEP104: 1057 return ieee80211_crypto_wep_encrypt(tx); 1058 case WLAN_CIPHER_SUITE_TKIP: 1059 return ieee80211_crypto_tkip_encrypt(tx); 1060 case WLAN_CIPHER_SUITE_CCMP: 1061 return ieee80211_crypto_ccmp_encrypt( 1062 tx, IEEE80211_CCMP_MIC_LEN); 1063 case WLAN_CIPHER_SUITE_CCMP_256: 1064 return ieee80211_crypto_ccmp_encrypt( 1065 tx, IEEE80211_CCMP_256_MIC_LEN); 1066 case WLAN_CIPHER_SUITE_AES_CMAC: 1067 return ieee80211_crypto_aes_cmac_encrypt( 1068 tx, IEEE80211_CMAC_128_MIC_LEN); 1069 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1070 return ieee80211_crypto_aes_cmac_encrypt( 1071 tx, IEEE80211_CMAC_256_MIC_LEN); 1072 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1073 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1074 return ieee80211_crypto_aes_gmac_encrypt(tx); 1075 case WLAN_CIPHER_SUITE_GCMP: 1076 case WLAN_CIPHER_SUITE_GCMP_256: 1077 return ieee80211_crypto_gcmp_encrypt(tx); 1078 } 1079 1080 return TX_DROP; 1081 } 1082 1083 static ieee80211_tx_result debug_noinline 1084 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1085 { 1086 struct sk_buff *skb; 1087 struct ieee80211_hdr *hdr; 1088 int next_len; 1089 bool group_addr; 1090 1091 skb_queue_walk(&tx->skbs, skb) { 1092 hdr = (void *) skb->data; 1093 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1094 break; /* must not overwrite AID */ 1095 if (!skb_queue_is_last(&tx->skbs, skb)) { 1096 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1097 next_len = next->len; 1098 } else 1099 next_len = 0; 1100 group_addr = is_multicast_ether_addr(hdr->addr1); 1101 1102 hdr->duration_id = 1103 ieee80211_duration(tx, skb, group_addr, next_len); 1104 } 1105 1106 return TX_CONTINUE; 1107 } 1108 1109 /* actual transmit path */ 1110 1111 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1112 struct sk_buff *skb, 1113 struct ieee80211_tx_info *info, 1114 struct tid_ampdu_tx *tid_tx, 1115 int tid) 1116 { 1117 bool queued = false; 1118 bool reset_agg_timer = false; 1119 struct sk_buff *purge_skb = NULL; 1120 1121 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1122 reset_agg_timer = true; 1123 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1124 /* 1125 * nothing -- this aggregation session is being started 1126 * but that might still fail with the driver 1127 */ 1128 } else if (!tx->sta->sta.txq[tid]) { 1129 spin_lock(&tx->sta->lock); 1130 /* 1131 * Need to re-check now, because we may get here 1132 * 1133 * 1) in the window during which the setup is actually 1134 * already done, but not marked yet because not all 1135 * packets are spliced over to the driver pending 1136 * queue yet -- if this happened we acquire the lock 1137 * either before or after the splice happens, but 1138 * need to recheck which of these cases happened. 1139 * 1140 * 2) during session teardown, if the OPERATIONAL bit 1141 * was cleared due to the teardown but the pointer 1142 * hasn't been assigned NULL yet (or we loaded it 1143 * before it was assigned) -- in this case it may 1144 * now be NULL which means we should just let the 1145 * packet pass through because splicing the frames 1146 * back is already done. 1147 */ 1148 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1149 1150 if (!tid_tx) { 1151 /* do nothing, let packet pass through */ 1152 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1153 reset_agg_timer = true; 1154 } else { 1155 queued = true; 1156 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1157 clear_sta_flag(tx->sta, WLAN_STA_SP); 1158 ps_dbg(tx->sta->sdata, 1159 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1160 tx->sta->sta.addr, tx->sta->sta.aid); 1161 } 1162 info->control.vif = &tx->sdata->vif; 1163 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1164 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1165 __skb_queue_tail(&tid_tx->pending, skb); 1166 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1167 purge_skb = __skb_dequeue(&tid_tx->pending); 1168 } 1169 spin_unlock(&tx->sta->lock); 1170 1171 if (purge_skb) 1172 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1173 } 1174 1175 /* reset session timer */ 1176 if (reset_agg_timer) 1177 tid_tx->last_tx = jiffies; 1178 1179 return queued; 1180 } 1181 1182 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1183 struct sta_info *sta, struct sk_buff *skb) 1184 { 1185 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1186 u16 tid; 1187 1188 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1189 return; 1190 1191 if (!sta || 1192 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1193 !sta->sta.deflink.s1g_cap.s1g) || 1194 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1195 skb->protocol == sdata->control_port_protocol) 1196 return; 1197 1198 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1199 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1200 return; 1201 1202 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1203 } 1204 1205 /* 1206 * initialises @tx 1207 * pass %NULL for the station if unknown, a valid pointer if known 1208 * or an ERR_PTR() if the station is known not to exist 1209 */ 1210 static ieee80211_tx_result 1211 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1212 struct ieee80211_tx_data *tx, 1213 struct sta_info *sta, struct sk_buff *skb) 1214 { 1215 struct ieee80211_local *local = sdata->local; 1216 struct ieee80211_hdr *hdr; 1217 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1218 bool aggr_check = false; 1219 int tid; 1220 1221 memset(tx, 0, sizeof(*tx)); 1222 tx->skb = skb; 1223 tx->local = local; 1224 tx->sdata = sdata; 1225 __skb_queue_head_init(&tx->skbs); 1226 1227 /* 1228 * If this flag is set to true anywhere, and we get here, 1229 * we are doing the needed processing, so remove the flag 1230 * now. 1231 */ 1232 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1233 1234 hdr = (struct ieee80211_hdr *) skb->data; 1235 1236 if (likely(sta)) { 1237 if (!IS_ERR(sta)) 1238 tx->sta = sta; 1239 } else { 1240 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1241 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1242 if (!tx->sta && sdata->wdev.use_4addr) 1243 return TX_DROP; 1244 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1245 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1246 } 1247 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1248 tx->sta = sta_info_get(sdata, hdr->addr1); 1249 aggr_check = true; 1250 } 1251 } 1252 1253 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1254 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1255 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1256 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1257 struct tid_ampdu_tx *tid_tx; 1258 1259 tid = ieee80211_get_tid(hdr); 1260 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1261 if (!tid_tx && aggr_check) { 1262 ieee80211_aggr_check(sdata, tx->sta, skb); 1263 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1264 } 1265 1266 if (tid_tx) { 1267 bool queued; 1268 1269 queued = ieee80211_tx_prep_agg(tx, skb, info, 1270 tid_tx, tid); 1271 1272 if (unlikely(queued)) 1273 return TX_QUEUED; 1274 } 1275 } 1276 1277 if (is_multicast_ether_addr(hdr->addr1)) { 1278 tx->flags &= ~IEEE80211_TX_UNICAST; 1279 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1280 } else 1281 tx->flags |= IEEE80211_TX_UNICAST; 1282 1283 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1284 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1285 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1286 info->flags & IEEE80211_TX_CTL_AMPDU) 1287 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1288 } 1289 1290 if (!tx->sta) 1291 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1292 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1293 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1294 ieee80211_check_fast_xmit(tx->sta); 1295 } 1296 1297 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1298 1299 return TX_CONTINUE; 1300 } 1301 1302 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1303 struct ieee80211_vif *vif, 1304 struct sta_info *sta, 1305 struct sk_buff *skb) 1306 { 1307 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1308 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1309 struct ieee80211_txq *txq = NULL; 1310 1311 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1312 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1313 return NULL; 1314 1315 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1316 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1317 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1318 ieee80211_is_bufferable_mmpdu(skb) || 1319 vif->type == NL80211_IFTYPE_STATION) && 1320 sta && sta->uploaded) { 1321 /* 1322 * This will be NULL if the driver didn't set the 1323 * opt-in hardware flag. 1324 */ 1325 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1326 } 1327 } else if (sta) { 1328 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1329 1330 if (!sta->uploaded) 1331 return NULL; 1332 1333 txq = sta->sta.txq[tid]; 1334 } else { 1335 txq = vif->txq; 1336 } 1337 1338 if (!txq) 1339 return NULL; 1340 1341 return to_txq_info(txq); 1342 } 1343 1344 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1345 { 1346 struct sk_buff *next; 1347 codel_time_t now = codel_get_time(); 1348 1349 skb_list_walk_safe(skb, skb, next) 1350 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1351 } 1352 1353 static u32 codel_skb_len_func(const struct sk_buff *skb) 1354 { 1355 return skb->len; 1356 } 1357 1358 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1359 { 1360 const struct ieee80211_tx_info *info; 1361 1362 info = (const struct ieee80211_tx_info *)skb->cb; 1363 return info->control.enqueue_time; 1364 } 1365 1366 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1367 void *ctx) 1368 { 1369 struct ieee80211_local *local; 1370 struct txq_info *txqi; 1371 struct fq *fq; 1372 struct fq_flow *flow; 1373 1374 txqi = ctx; 1375 local = vif_to_sdata(txqi->txq.vif)->local; 1376 fq = &local->fq; 1377 1378 if (cvars == &txqi->def_cvars) 1379 flow = &txqi->tin.default_flow; 1380 else 1381 flow = &fq->flows[cvars - local->cvars]; 1382 1383 return fq_flow_dequeue(fq, flow); 1384 } 1385 1386 static void codel_drop_func(struct sk_buff *skb, 1387 void *ctx) 1388 { 1389 struct ieee80211_local *local; 1390 struct ieee80211_hw *hw; 1391 struct txq_info *txqi; 1392 1393 txqi = ctx; 1394 local = vif_to_sdata(txqi->txq.vif)->local; 1395 hw = &local->hw; 1396 1397 ieee80211_free_txskb(hw, skb); 1398 } 1399 1400 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1401 struct fq_tin *tin, 1402 struct fq_flow *flow) 1403 { 1404 struct ieee80211_local *local; 1405 struct txq_info *txqi; 1406 struct codel_vars *cvars; 1407 struct codel_params *cparams; 1408 struct codel_stats *cstats; 1409 1410 local = container_of(fq, struct ieee80211_local, fq); 1411 txqi = container_of(tin, struct txq_info, tin); 1412 cparams = &local->cparams; 1413 cstats = &txqi->cstats; 1414 1415 if (flow == &tin->default_flow) 1416 cvars = &txqi->def_cvars; 1417 else 1418 cvars = &local->cvars[flow - fq->flows]; 1419 1420 return codel_dequeue(txqi, 1421 &flow->backlog, 1422 cparams, 1423 cvars, 1424 cstats, 1425 codel_skb_len_func, 1426 codel_skb_time_func, 1427 codel_drop_func, 1428 codel_dequeue_func); 1429 } 1430 1431 static void fq_skb_free_func(struct fq *fq, 1432 struct fq_tin *tin, 1433 struct fq_flow *flow, 1434 struct sk_buff *skb) 1435 { 1436 struct ieee80211_local *local; 1437 1438 local = container_of(fq, struct ieee80211_local, fq); 1439 ieee80211_free_txskb(&local->hw, skb); 1440 } 1441 1442 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1443 struct txq_info *txqi, 1444 struct sk_buff *skb) 1445 { 1446 struct fq *fq = &local->fq; 1447 struct fq_tin *tin = &txqi->tin; 1448 u32 flow_idx; 1449 1450 ieee80211_set_skb_enqueue_time(skb); 1451 1452 spin_lock_bh(&fq->lock); 1453 /* 1454 * For management frames, don't really apply codel etc., 1455 * we don't want to apply any shaping or anything we just 1456 * want to simplify the driver API by having them on the 1457 * txqi. 1458 */ 1459 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1460 IEEE80211_SKB_CB(skb)->control.flags |= 1461 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1462 __skb_queue_tail(&txqi->frags, skb); 1463 } else { 1464 flow_idx = fq_flow_idx(fq, skb); 1465 fq_tin_enqueue(fq, tin, flow_idx, skb, 1466 fq_skb_free_func); 1467 } 1468 spin_unlock_bh(&fq->lock); 1469 } 1470 1471 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1472 struct fq_flow *flow, struct sk_buff *skb, 1473 void *data) 1474 { 1475 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1476 1477 return info->control.vif == data; 1478 } 1479 1480 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1481 struct ieee80211_sub_if_data *sdata) 1482 { 1483 struct fq *fq = &local->fq; 1484 struct txq_info *txqi; 1485 struct fq_tin *tin; 1486 struct ieee80211_sub_if_data *ap; 1487 1488 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1489 return; 1490 1491 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1492 1493 if (!ap->vif.txq) 1494 return; 1495 1496 txqi = to_txq_info(ap->vif.txq); 1497 tin = &txqi->tin; 1498 1499 spin_lock_bh(&fq->lock); 1500 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1501 fq_skb_free_func); 1502 spin_unlock_bh(&fq->lock); 1503 } 1504 1505 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1506 struct sta_info *sta, 1507 struct txq_info *txqi, int tid) 1508 { 1509 fq_tin_init(&txqi->tin); 1510 codel_vars_init(&txqi->def_cvars); 1511 codel_stats_init(&txqi->cstats); 1512 __skb_queue_head_init(&txqi->frags); 1513 INIT_LIST_HEAD(&txqi->schedule_order); 1514 1515 txqi->txq.vif = &sdata->vif; 1516 1517 if (!sta) { 1518 sdata->vif.txq = &txqi->txq; 1519 txqi->txq.tid = 0; 1520 txqi->txq.ac = IEEE80211_AC_BE; 1521 1522 return; 1523 } 1524 1525 if (tid == IEEE80211_NUM_TIDS) { 1526 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1527 /* Drivers need to opt in to the management MPDU TXQ */ 1528 if (!ieee80211_hw_check(&sdata->local->hw, 1529 STA_MMPDU_TXQ)) 1530 return; 1531 } else if (!ieee80211_hw_check(&sdata->local->hw, 1532 BUFF_MMPDU_TXQ)) { 1533 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1534 return; 1535 } 1536 txqi->txq.ac = IEEE80211_AC_VO; 1537 } else { 1538 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1539 } 1540 1541 txqi->txq.sta = &sta->sta; 1542 txqi->txq.tid = tid; 1543 sta->sta.txq[tid] = &txqi->txq; 1544 } 1545 1546 void ieee80211_txq_purge(struct ieee80211_local *local, 1547 struct txq_info *txqi) 1548 { 1549 struct fq *fq = &local->fq; 1550 struct fq_tin *tin = &txqi->tin; 1551 1552 spin_lock_bh(&fq->lock); 1553 fq_tin_reset(fq, tin, fq_skb_free_func); 1554 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1555 spin_unlock_bh(&fq->lock); 1556 1557 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1558 list_del_init(&txqi->schedule_order); 1559 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1560 } 1561 1562 void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx) 1563 { 1564 if (local->hw.wiphy->txq_limit) 1565 local->fq.limit = local->hw.wiphy->txq_limit; 1566 else 1567 local->hw.wiphy->txq_limit = local->fq.limit; 1568 1569 if (local->hw.wiphy->txq_memory_limit) 1570 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1571 else 1572 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1573 1574 if (local->hw.wiphy->txq_quantum) 1575 local->fq.quantum = local->hw.wiphy->txq_quantum; 1576 else 1577 local->hw.wiphy->txq_quantum = local->fq.quantum; 1578 } 1579 1580 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1581 { 1582 struct fq *fq = &local->fq; 1583 int ret; 1584 int i; 1585 bool supp_vht = false; 1586 enum nl80211_band band; 1587 1588 ret = fq_init(fq, 4096); 1589 if (ret) 1590 return ret; 1591 1592 /* 1593 * If the hardware doesn't support VHT, it is safe to limit the maximum 1594 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1595 */ 1596 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1597 struct ieee80211_supported_band *sband; 1598 1599 sband = local->hw.wiphy->bands[band]; 1600 if (!sband) 1601 continue; 1602 1603 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1604 } 1605 1606 if (!supp_vht) 1607 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1608 1609 codel_params_init(&local->cparams); 1610 local->cparams.interval = MS2TIME(100); 1611 local->cparams.target = MS2TIME(20); 1612 local->cparams.ecn = true; 1613 1614 local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1615 GFP_KERNEL); 1616 if (!local->cvars) { 1617 spin_lock_bh(&fq->lock); 1618 fq_reset(fq, fq_skb_free_func); 1619 spin_unlock_bh(&fq->lock); 1620 return -ENOMEM; 1621 } 1622 1623 for (i = 0; i < fq->flows_cnt; i++) 1624 codel_vars_init(&local->cvars[i]); 1625 1626 ieee80211_txq_set_params(local, -1); 1627 1628 return 0; 1629 } 1630 1631 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1632 { 1633 struct fq *fq = &local->fq; 1634 1635 kvfree(local->cvars); 1636 local->cvars = NULL; 1637 1638 spin_lock_bh(&fq->lock); 1639 fq_reset(fq, fq_skb_free_func); 1640 spin_unlock_bh(&fq->lock); 1641 } 1642 1643 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1644 struct ieee80211_sub_if_data *sdata, 1645 struct sta_info *sta, 1646 struct sk_buff *skb) 1647 { 1648 struct ieee80211_vif *vif; 1649 struct txq_info *txqi; 1650 1651 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1652 return false; 1653 1654 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1655 sdata = container_of(sdata->bss, 1656 struct ieee80211_sub_if_data, u.ap); 1657 1658 vif = &sdata->vif; 1659 txqi = ieee80211_get_txq(local, vif, sta, skb); 1660 1661 if (!txqi) 1662 return false; 1663 1664 ieee80211_txq_enqueue(local, txqi, skb); 1665 1666 schedule_and_wake_txq(local, txqi); 1667 1668 return true; 1669 } 1670 1671 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1672 struct ieee80211_vif *vif, 1673 struct sta_info *sta, 1674 struct sk_buff_head *skbs, 1675 bool txpending) 1676 { 1677 struct ieee80211_tx_control control = {}; 1678 struct sk_buff *skb, *tmp; 1679 unsigned long flags; 1680 1681 skb_queue_walk_safe(skbs, skb, tmp) { 1682 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1683 int q = info->hw_queue; 1684 1685 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1686 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1687 __skb_unlink(skb, skbs); 1688 ieee80211_free_txskb(&local->hw, skb); 1689 continue; 1690 } 1691 #endif 1692 1693 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1694 if (local->queue_stop_reasons[q] || 1695 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1696 if (unlikely(info->flags & 1697 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1698 if (local->queue_stop_reasons[q] & 1699 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1700 /* 1701 * Drop off-channel frames if queues 1702 * are stopped for any reason other 1703 * than off-channel operation. Never 1704 * queue them. 1705 */ 1706 spin_unlock_irqrestore( 1707 &local->queue_stop_reason_lock, 1708 flags); 1709 ieee80211_purge_tx_queue(&local->hw, 1710 skbs); 1711 return true; 1712 } 1713 } else { 1714 1715 /* 1716 * Since queue is stopped, queue up frames for 1717 * later transmission from the tx-pending 1718 * tasklet when the queue is woken again. 1719 */ 1720 if (txpending) 1721 skb_queue_splice_init(skbs, 1722 &local->pending[q]); 1723 else 1724 skb_queue_splice_tail_init(skbs, 1725 &local->pending[q]); 1726 1727 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1728 flags); 1729 return false; 1730 } 1731 } 1732 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1733 1734 info->control.vif = vif; 1735 control.sta = sta ? &sta->sta : NULL; 1736 1737 __skb_unlink(skb, skbs); 1738 drv_tx(local, &control, skb); 1739 } 1740 1741 return true; 1742 } 1743 1744 /* 1745 * Returns false if the frame couldn't be transmitted but was queued instead. 1746 */ 1747 static bool __ieee80211_tx(struct ieee80211_local *local, 1748 struct sk_buff_head *skbs, struct sta_info *sta, 1749 bool txpending) 1750 { 1751 struct ieee80211_tx_info *info; 1752 struct ieee80211_sub_if_data *sdata; 1753 struct ieee80211_vif *vif; 1754 struct sk_buff *skb; 1755 bool result; 1756 1757 if (WARN_ON(skb_queue_empty(skbs))) 1758 return true; 1759 1760 skb = skb_peek(skbs); 1761 info = IEEE80211_SKB_CB(skb); 1762 sdata = vif_to_sdata(info->control.vif); 1763 if (sta && !sta->uploaded) 1764 sta = NULL; 1765 1766 switch (sdata->vif.type) { 1767 case NL80211_IFTYPE_MONITOR: 1768 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1769 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1770 vif = &sdata->vif; 1771 break; 1772 } 1773 sdata = rcu_dereference(local->monitor_sdata); 1774 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1775 vif = &sdata->vif; 1776 info->hw_queue = 1777 vif->hw_queue[skb_get_queue_mapping(skb)]; 1778 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1779 ieee80211_purge_tx_queue(&local->hw, skbs); 1780 return true; 1781 } else 1782 vif = NULL; 1783 break; 1784 case NL80211_IFTYPE_AP_VLAN: 1785 sdata = container_of(sdata->bss, 1786 struct ieee80211_sub_if_data, u.ap); 1787 fallthrough; 1788 default: 1789 vif = &sdata->vif; 1790 break; 1791 } 1792 1793 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1794 1795 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1796 1797 return result; 1798 } 1799 1800 /* 1801 * Invoke TX handlers, return 0 on success and non-zero if the 1802 * frame was dropped or queued. 1803 * 1804 * The handlers are split into an early and late part. The latter is everything 1805 * that can be sensitive to reordering, and will be deferred to after packets 1806 * are dequeued from the intermediate queues (when they are enabled). 1807 */ 1808 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1809 { 1810 ieee80211_tx_result res = TX_DROP; 1811 1812 #define CALL_TXH(txh) \ 1813 do { \ 1814 res = txh(tx); \ 1815 if (res != TX_CONTINUE) \ 1816 goto txh_done; \ 1817 } while (0) 1818 1819 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1820 CALL_TXH(ieee80211_tx_h_check_assoc); 1821 CALL_TXH(ieee80211_tx_h_ps_buf); 1822 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1823 CALL_TXH(ieee80211_tx_h_select_key); 1824 1825 txh_done: 1826 if (unlikely(res == TX_DROP)) { 1827 tx->sdata->tx_handlers_drop++; 1828 if (tx->skb) 1829 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1830 else 1831 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1832 return -1; 1833 } else if (unlikely(res == TX_QUEUED)) { 1834 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1835 return -1; 1836 } 1837 1838 return 0; 1839 } 1840 1841 /* 1842 * Late handlers can be called while the sta lock is held. Handlers that can 1843 * cause packets to be generated will cause deadlock! 1844 */ 1845 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1846 { 1847 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1848 ieee80211_tx_result res = TX_CONTINUE; 1849 1850 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1851 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1852 1853 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1854 __skb_queue_tail(&tx->skbs, tx->skb); 1855 tx->skb = NULL; 1856 goto txh_done; 1857 } 1858 1859 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1860 CALL_TXH(ieee80211_tx_h_sequence); 1861 CALL_TXH(ieee80211_tx_h_fragment); 1862 /* handlers after fragment must be aware of tx info fragmentation! */ 1863 CALL_TXH(ieee80211_tx_h_stats); 1864 CALL_TXH(ieee80211_tx_h_encrypt); 1865 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1866 CALL_TXH(ieee80211_tx_h_calculate_duration); 1867 #undef CALL_TXH 1868 1869 txh_done: 1870 if (unlikely(res == TX_DROP)) { 1871 tx->sdata->tx_handlers_drop++; 1872 if (tx->skb) 1873 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1874 else 1875 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1876 return -1; 1877 } else if (unlikely(res == TX_QUEUED)) { 1878 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1879 return -1; 1880 } 1881 1882 return 0; 1883 } 1884 1885 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1886 { 1887 int r = invoke_tx_handlers_early(tx); 1888 1889 if (r) 1890 return r; 1891 return invoke_tx_handlers_late(tx); 1892 } 1893 1894 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1895 struct ieee80211_vif *vif, struct sk_buff *skb, 1896 int band, struct ieee80211_sta **sta) 1897 { 1898 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1899 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1900 struct ieee80211_tx_data tx; 1901 struct sk_buff *skb2; 1902 1903 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1904 return false; 1905 1906 info->band = band; 1907 info->control.vif = vif; 1908 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1909 1910 if (invoke_tx_handlers(&tx)) 1911 return false; 1912 1913 if (sta) { 1914 if (tx.sta) 1915 *sta = &tx.sta->sta; 1916 else 1917 *sta = NULL; 1918 } 1919 1920 /* this function isn't suitable for fragmented data frames */ 1921 skb2 = __skb_dequeue(&tx.skbs); 1922 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1923 ieee80211_free_txskb(hw, skb2); 1924 ieee80211_purge_tx_queue(hw, &tx.skbs); 1925 return false; 1926 } 1927 1928 return true; 1929 } 1930 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1931 1932 /* 1933 * Returns false if the frame couldn't be transmitted but was queued instead. 1934 */ 1935 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1936 struct sta_info *sta, struct sk_buff *skb, 1937 bool txpending) 1938 { 1939 struct ieee80211_local *local = sdata->local; 1940 struct ieee80211_tx_data tx; 1941 ieee80211_tx_result res_prepare; 1942 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1943 bool result = true; 1944 1945 if (unlikely(skb->len < 10)) { 1946 dev_kfree_skb(skb); 1947 return true; 1948 } 1949 1950 /* initialises tx */ 1951 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1952 1953 if (unlikely(res_prepare == TX_DROP)) { 1954 ieee80211_free_txskb(&local->hw, skb); 1955 tx.sdata->tx_handlers_drop++; 1956 return true; 1957 } else if (unlikely(res_prepare == TX_QUEUED)) { 1958 return true; 1959 } 1960 1961 /* set up hw_queue value early */ 1962 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1963 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1964 info->hw_queue = 1965 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1966 1967 if (invoke_tx_handlers_early(&tx)) 1968 return true; 1969 1970 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1971 return true; 1972 1973 if (!invoke_tx_handlers_late(&tx)) 1974 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1975 1976 return result; 1977 } 1978 1979 /* device xmit handlers */ 1980 1981 enum ieee80211_encrypt { 1982 ENCRYPT_NO, 1983 ENCRYPT_MGMT, 1984 ENCRYPT_DATA, 1985 }; 1986 1987 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1988 struct sk_buff *skb, 1989 int head_need, 1990 enum ieee80211_encrypt encrypt) 1991 { 1992 struct ieee80211_local *local = sdata->local; 1993 bool enc_tailroom; 1994 int tail_need = 0; 1995 1996 enc_tailroom = encrypt == ENCRYPT_MGMT || 1997 (encrypt == ENCRYPT_DATA && 1998 sdata->crypto_tx_tailroom_needed_cnt); 1999 2000 if (enc_tailroom) { 2001 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2002 tail_need -= skb_tailroom(skb); 2003 tail_need = max_t(int, tail_need, 0); 2004 } 2005 2006 if (skb_cloned(skb) && 2007 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2008 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2009 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2010 else if (head_need || tail_need) 2011 I802_DEBUG_INC(local->tx_expand_skb_head); 2012 else 2013 return 0; 2014 2015 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2016 wiphy_debug(local->hw.wiphy, 2017 "failed to reallocate TX buffer\n"); 2018 return -ENOMEM; 2019 } 2020 2021 return 0; 2022 } 2023 2024 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2025 struct sta_info *sta, struct sk_buff *skb) 2026 { 2027 struct ieee80211_local *local = sdata->local; 2028 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2029 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2030 int headroom; 2031 enum ieee80211_encrypt encrypt; 2032 2033 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2034 encrypt = ENCRYPT_NO; 2035 else if (ieee80211_is_mgmt(hdr->frame_control)) 2036 encrypt = ENCRYPT_MGMT; 2037 else 2038 encrypt = ENCRYPT_DATA; 2039 2040 headroom = local->tx_headroom; 2041 if (encrypt != ENCRYPT_NO) 2042 headroom += IEEE80211_ENCRYPT_HEADROOM; 2043 headroom -= skb_headroom(skb); 2044 headroom = max_t(int, 0, headroom); 2045 2046 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2047 ieee80211_free_txskb(&local->hw, skb); 2048 return; 2049 } 2050 2051 /* reload after potential resize */ 2052 hdr = (struct ieee80211_hdr *) skb->data; 2053 info->control.vif = &sdata->vif; 2054 2055 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2056 if (ieee80211_is_data(hdr->frame_control) && 2057 is_unicast_ether_addr(hdr->addr1)) { 2058 if (mesh_nexthop_resolve(sdata, skb)) 2059 return; /* skb queued: don't free */ 2060 } else { 2061 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2062 } 2063 } 2064 2065 ieee80211_set_qos_hdr(sdata, skb); 2066 ieee80211_tx(sdata, sta, skb, false); 2067 } 2068 2069 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2070 { 2071 struct ieee80211_radiotap_header *rthdr = 2072 (struct ieee80211_radiotap_header *)skb->data; 2073 2074 /* check for not even having the fixed radiotap header part */ 2075 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2076 return false; /* too short to be possibly valid */ 2077 2078 /* is it a header version we can trust to find length from? */ 2079 if (unlikely(rthdr->it_version)) 2080 return false; /* only version 0 is supported */ 2081 2082 /* does the skb contain enough to deliver on the alleged length? */ 2083 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2084 return false; /* skb too short for claimed rt header extent */ 2085 2086 return true; 2087 } 2088 2089 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2090 struct net_device *dev) 2091 { 2092 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2093 struct ieee80211_radiotap_iterator iterator; 2094 struct ieee80211_radiotap_header *rthdr = 2095 (struct ieee80211_radiotap_header *) skb->data; 2096 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2097 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2098 NULL); 2099 u16 txflags; 2100 u16 rate = 0; 2101 bool rate_found = false; 2102 u8 rate_retries = 0; 2103 u16 rate_flags = 0; 2104 u8 mcs_known, mcs_flags, mcs_bw; 2105 u16 vht_known; 2106 u8 vht_mcs = 0, vht_nss = 0; 2107 int i; 2108 2109 if (!ieee80211_validate_radiotap_len(skb)) 2110 return false; 2111 2112 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2113 IEEE80211_TX_CTL_DONTFRAG; 2114 2115 /* 2116 * for every radiotap entry that is present 2117 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2118 * entries present, or -EINVAL on error) 2119 */ 2120 2121 while (!ret) { 2122 ret = ieee80211_radiotap_iterator_next(&iterator); 2123 2124 if (ret) 2125 continue; 2126 2127 /* see if this argument is something we can use */ 2128 switch (iterator.this_arg_index) { 2129 /* 2130 * You must take care when dereferencing iterator.this_arg 2131 * for multibyte types... the pointer is not aligned. Use 2132 * get_unaligned((type *)iterator.this_arg) to dereference 2133 * iterator.this_arg for type "type" safely on all arches. 2134 */ 2135 case IEEE80211_RADIOTAP_FLAGS: 2136 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2137 /* 2138 * this indicates that the skb we have been 2139 * handed has the 32-bit FCS CRC at the end... 2140 * we should react to that by snipping it off 2141 * because it will be recomputed and added 2142 * on transmission 2143 */ 2144 if (skb->len < (iterator._max_length + FCS_LEN)) 2145 return false; 2146 2147 skb_trim(skb, skb->len - FCS_LEN); 2148 } 2149 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2150 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2151 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2152 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2153 break; 2154 2155 case IEEE80211_RADIOTAP_TX_FLAGS: 2156 txflags = get_unaligned_le16(iterator.this_arg); 2157 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2158 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2159 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2160 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2161 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2162 info->control.flags |= 2163 IEEE80211_TX_CTRL_DONT_REORDER; 2164 break; 2165 2166 case IEEE80211_RADIOTAP_RATE: 2167 rate = *iterator.this_arg; 2168 rate_flags = 0; 2169 rate_found = true; 2170 break; 2171 2172 case IEEE80211_RADIOTAP_ANTENNA: 2173 /* this can appear multiple times, keep a bitmap */ 2174 info->control.antennas |= BIT(*iterator.this_arg); 2175 break; 2176 2177 case IEEE80211_RADIOTAP_DATA_RETRIES: 2178 rate_retries = *iterator.this_arg; 2179 break; 2180 2181 case IEEE80211_RADIOTAP_MCS: 2182 mcs_known = iterator.this_arg[0]; 2183 mcs_flags = iterator.this_arg[1]; 2184 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2185 break; 2186 2187 rate_found = true; 2188 rate = iterator.this_arg[2]; 2189 rate_flags = IEEE80211_TX_RC_MCS; 2190 2191 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2192 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2193 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2194 2195 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2196 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2197 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2198 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2199 2200 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2201 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2202 info->flags |= IEEE80211_TX_CTL_LDPC; 2203 2204 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2205 u8 stbc = u8_get_bits(mcs_flags, 2206 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2207 2208 info->flags |= 2209 u32_encode_bits(stbc, 2210 IEEE80211_TX_CTL_STBC); 2211 } 2212 break; 2213 2214 case IEEE80211_RADIOTAP_VHT: 2215 vht_known = get_unaligned_le16(iterator.this_arg); 2216 rate_found = true; 2217 2218 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2219 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2220 (iterator.this_arg[2] & 2221 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2222 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2223 if (vht_known & 2224 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2225 if (iterator.this_arg[3] == 1) 2226 rate_flags |= 2227 IEEE80211_TX_RC_40_MHZ_WIDTH; 2228 else if (iterator.this_arg[3] == 4) 2229 rate_flags |= 2230 IEEE80211_TX_RC_80_MHZ_WIDTH; 2231 else if (iterator.this_arg[3] == 11) 2232 rate_flags |= 2233 IEEE80211_TX_RC_160_MHZ_WIDTH; 2234 } 2235 2236 vht_mcs = iterator.this_arg[4] >> 4; 2237 if (vht_mcs > 11) 2238 vht_mcs = 0; 2239 vht_nss = iterator.this_arg[4] & 0xF; 2240 if (!vht_nss || vht_nss > 8) 2241 vht_nss = 1; 2242 break; 2243 2244 /* 2245 * Please update the file 2246 * Documentation/networking/mac80211-injection.rst 2247 * when parsing new fields here. 2248 */ 2249 2250 default: 2251 break; 2252 } 2253 } 2254 2255 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2256 return false; 2257 2258 if (rate_found) { 2259 struct ieee80211_supported_band *sband = 2260 local->hw.wiphy->bands[info->band]; 2261 2262 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2263 2264 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2265 info->control.rates[i].idx = -1; 2266 info->control.rates[i].flags = 0; 2267 info->control.rates[i].count = 0; 2268 } 2269 2270 if (rate_flags & IEEE80211_TX_RC_MCS) { 2271 /* reset antennas if not enough */ 2272 if (IEEE80211_HT_MCS_CHAINS(rate) > 2273 hweight8(info->control.antennas)) 2274 info->control.antennas = 0; 2275 2276 info->control.rates[0].idx = rate; 2277 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2278 /* reset antennas if not enough */ 2279 if (vht_nss > hweight8(info->control.antennas)) 2280 info->control.antennas = 0; 2281 2282 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2283 vht_nss); 2284 } else if (sband) { 2285 for (i = 0; i < sband->n_bitrates; i++) { 2286 if (rate * 5 != sband->bitrates[i].bitrate) 2287 continue; 2288 2289 info->control.rates[0].idx = i; 2290 break; 2291 } 2292 } 2293 2294 if (info->control.rates[0].idx < 0) 2295 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2296 2297 info->control.rates[0].flags = rate_flags; 2298 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2299 local->hw.max_rate_tries); 2300 } 2301 2302 return true; 2303 } 2304 2305 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2306 struct net_device *dev) 2307 { 2308 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2309 struct ieee80211_chanctx_conf *chanctx_conf; 2310 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2311 struct ieee80211_hdr *hdr; 2312 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2313 struct cfg80211_chan_def *chandef; 2314 u16 len_rthdr; 2315 int hdrlen; 2316 2317 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2318 if (unlikely(!ieee80211_sdata_running(sdata))) 2319 goto fail; 2320 2321 memset(info, 0, sizeof(*info)); 2322 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2323 IEEE80211_TX_CTL_INJECTED; 2324 2325 /* Sanity-check the length of the radiotap header */ 2326 if (!ieee80211_validate_radiotap_len(skb)) 2327 goto fail; 2328 2329 /* we now know there is a radiotap header with a length we can use */ 2330 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2331 2332 /* 2333 * fix up the pointers accounting for the radiotap 2334 * header still being in there. We are being given 2335 * a precooked IEEE80211 header so no need for 2336 * normal processing 2337 */ 2338 skb_set_mac_header(skb, len_rthdr); 2339 /* 2340 * these are just fixed to the end of the rt area since we 2341 * don't have any better information and at this point, nobody cares 2342 */ 2343 skb_set_network_header(skb, len_rthdr); 2344 skb_set_transport_header(skb, len_rthdr); 2345 2346 if (skb->len < len_rthdr + 2) 2347 goto fail; 2348 2349 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2350 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2351 2352 if (skb->len < len_rthdr + hdrlen) 2353 goto fail; 2354 2355 /* 2356 * Initialize skb->protocol if the injected frame is a data frame 2357 * carrying a rfc1042 header 2358 */ 2359 if (ieee80211_is_data(hdr->frame_control) && 2360 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2361 u8 *payload = (u8 *)hdr + hdrlen; 2362 2363 if (ether_addr_equal(payload, rfc1042_header)) 2364 skb->protocol = cpu_to_be16((payload[6] << 8) | 2365 payload[7]); 2366 } 2367 2368 rcu_read_lock(); 2369 2370 /* 2371 * We process outgoing injected frames that have a local address 2372 * we handle as though they are non-injected frames. 2373 * This code here isn't entirely correct, the local MAC address 2374 * isn't always enough to find the interface to use; for proper 2375 * VLAN support we have an nl80211-based mechanism. 2376 * 2377 * This is necessary, for example, for old hostapd versions that 2378 * don't use nl80211-based management TX/RX. 2379 */ 2380 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2381 if (!ieee80211_sdata_running(tmp_sdata)) 2382 continue; 2383 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2384 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2385 continue; 2386 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2387 sdata = tmp_sdata; 2388 break; 2389 } 2390 } 2391 2392 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2393 if (!chanctx_conf) { 2394 tmp_sdata = rcu_dereference(local->monitor_sdata); 2395 if (tmp_sdata) 2396 chanctx_conf = 2397 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2398 } 2399 2400 if (chanctx_conf) 2401 chandef = &chanctx_conf->def; 2402 else if (local->emulate_chanctx) 2403 chandef = &local->hw.conf.chandef; 2404 else 2405 goto fail_rcu; 2406 2407 /* 2408 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2409 * shouldn't transmit on disabled channels. 2410 */ 2411 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2412 IEEE80211_CHAN_DISABLED)) 2413 goto fail_rcu; 2414 2415 /* 2416 * Frame injection is not allowed if beaconing is not allowed 2417 * or if we need radar detection. Beaconing is usually not allowed when 2418 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2419 * Passive scan is also used in world regulatory domains where 2420 * your country is not known and as such it should be treated as 2421 * NO TX unless the channel is explicitly allowed in which case 2422 * your current regulatory domain would not have the passive scan 2423 * flag. 2424 * 2425 * Since AP mode uses monitor interfaces to inject/TX management 2426 * frames we can make AP mode the exception to this rule once it 2427 * supports radar detection as its implementation can deal with 2428 * radar detection by itself. We can do that later by adding a 2429 * monitor flag interfaces used for AP support. 2430 */ 2431 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2432 sdata->vif.type)) 2433 goto fail_rcu; 2434 2435 info->band = chandef->chan->band; 2436 2437 /* Initialize skb->priority according to frame type and TID class, 2438 * with respect to the sub interface that the frame will actually 2439 * be transmitted on. If the DONT_REORDER flag is set, the original 2440 * skb-priority is preserved to assure frames injected with this 2441 * flag are not reordered relative to each other. 2442 */ 2443 ieee80211_select_queue_80211(sdata, skb, hdr); 2444 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2445 2446 /* 2447 * Process the radiotap header. This will now take into account the 2448 * selected chandef above to accurately set injection rates and 2449 * retransmissions. 2450 */ 2451 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2452 goto fail_rcu; 2453 2454 /* remove the injection radiotap header */ 2455 skb_pull(skb, len_rthdr); 2456 2457 ieee80211_xmit(sdata, NULL, skb); 2458 rcu_read_unlock(); 2459 2460 return NETDEV_TX_OK; 2461 2462 fail_rcu: 2463 rcu_read_unlock(); 2464 fail: 2465 dev_kfree_skb(skb); 2466 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2467 } 2468 2469 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2470 { 2471 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2472 2473 return ethertype == ETH_P_TDLS && 2474 skb->len > 14 && 2475 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2476 } 2477 2478 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2479 struct sk_buff *skb, 2480 struct sta_info **sta_out) 2481 { 2482 struct sta_info *sta; 2483 2484 switch (sdata->vif.type) { 2485 case NL80211_IFTYPE_AP_VLAN: 2486 sta = rcu_dereference(sdata->u.vlan.sta); 2487 if (sta) { 2488 *sta_out = sta; 2489 return 0; 2490 } else if (sdata->wdev.use_4addr) { 2491 return -ENOLINK; 2492 } 2493 fallthrough; 2494 case NL80211_IFTYPE_AP: 2495 case NL80211_IFTYPE_OCB: 2496 case NL80211_IFTYPE_ADHOC: 2497 if (is_multicast_ether_addr(skb->data)) { 2498 *sta_out = ERR_PTR(-ENOENT); 2499 return 0; 2500 } 2501 sta = sta_info_get_bss(sdata, skb->data); 2502 break; 2503 #ifdef CONFIG_MAC80211_MESH 2504 case NL80211_IFTYPE_MESH_POINT: 2505 /* determined much later */ 2506 *sta_out = NULL; 2507 return 0; 2508 #endif 2509 case NL80211_IFTYPE_STATION: 2510 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2511 sta = sta_info_get(sdata, skb->data); 2512 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2513 if (test_sta_flag(sta, 2514 WLAN_STA_TDLS_PEER_AUTH)) { 2515 *sta_out = sta; 2516 return 0; 2517 } 2518 2519 /* 2520 * TDLS link during setup - throw out frames to 2521 * peer. Allow TDLS-setup frames to unauthorized 2522 * peers for the special case of a link teardown 2523 * after a TDLS sta is removed due to being 2524 * unreachable. 2525 */ 2526 if (!ieee80211_is_tdls_setup(skb)) 2527 return -EINVAL; 2528 } 2529 2530 } 2531 2532 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2533 if (!sta) 2534 return -ENOLINK; 2535 break; 2536 default: 2537 return -EINVAL; 2538 } 2539 2540 *sta_out = sta ?: ERR_PTR(-ENOENT); 2541 return 0; 2542 } 2543 2544 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2545 struct sk_buff *skb, 2546 u32 *info_flags, 2547 u64 *cookie) 2548 { 2549 struct sk_buff *ack_skb; 2550 u16 info_id = 0; 2551 2552 if (skb->sk) 2553 ack_skb = skb_clone_sk(skb); 2554 else 2555 ack_skb = skb_clone(skb, GFP_ATOMIC); 2556 2557 if (ack_skb) { 2558 unsigned long flags; 2559 int id; 2560 2561 spin_lock_irqsave(&local->ack_status_lock, flags); 2562 id = idr_alloc(&local->ack_status_frames, ack_skb, 2563 1, 0x2000, GFP_ATOMIC); 2564 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2565 2566 if (id >= 0) { 2567 info_id = id; 2568 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2569 if (cookie) { 2570 *cookie = ieee80211_mgmt_tx_cookie(local); 2571 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2572 } 2573 } else { 2574 kfree_skb(ack_skb); 2575 } 2576 } 2577 2578 return info_id; 2579 } 2580 2581 /** 2582 * ieee80211_build_hdr - build 802.11 header in the given frame 2583 * @sdata: virtual interface to build the header for 2584 * @skb: the skb to build the header in 2585 * @info_flags: skb flags to set 2586 * @sta: the station pointer 2587 * @ctrl_flags: info control flags to set 2588 * @cookie: cookie pointer to fill (if not %NULL) 2589 * 2590 * This function takes the skb with 802.3 header and reformats the header to 2591 * the appropriate IEEE 802.11 header based on which interface the packet is 2592 * being transmitted on. 2593 * 2594 * Note that this function also takes care of the TX status request and 2595 * potential unsharing of the SKB - this needs to be interleaved with the 2596 * header building. 2597 * 2598 * The function requires the read-side RCU lock held 2599 * 2600 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2601 */ 2602 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2603 struct sk_buff *skb, u32 info_flags, 2604 struct sta_info *sta, u32 ctrl_flags, 2605 u64 *cookie) 2606 { 2607 struct ieee80211_local *local = sdata->local; 2608 struct ieee80211_tx_info *info; 2609 int head_need; 2610 u16 ethertype, hdrlen, meshhdrlen = 0; 2611 __le16 fc; 2612 struct ieee80211_hdr hdr; 2613 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2614 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2615 const u8 *encaps_data; 2616 int encaps_len, skip_header_bytes; 2617 bool wme_sta = false, authorized = false; 2618 bool tdls_peer; 2619 bool multicast; 2620 u16 info_id = 0; 2621 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2622 enum nl80211_band band; 2623 int ret; 2624 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2625 2626 if (IS_ERR(sta)) 2627 sta = NULL; 2628 2629 #ifdef CONFIG_MAC80211_DEBUGFS 2630 if (local->force_tx_status) 2631 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2632 #endif 2633 2634 /* convert Ethernet header to proper 802.11 header (based on 2635 * operation mode) */ 2636 ethertype = (skb->data[12] << 8) | skb->data[13]; 2637 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2638 2639 if (!ieee80211_vif_is_mld(&sdata->vif)) 2640 chanctx_conf = 2641 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2642 2643 switch (sdata->vif.type) { 2644 case NL80211_IFTYPE_AP_VLAN: 2645 if (sdata->wdev.use_4addr) { 2646 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2647 /* RA TA DA SA */ 2648 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2649 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2650 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2651 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2652 hdrlen = 30; 2653 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2654 wme_sta = sta->sta.wme; 2655 } 2656 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2657 struct ieee80211_sub_if_data *ap_sdata; 2658 2659 /* override chanctx_conf from AP (we don't have one) */ 2660 ap_sdata = container_of(sdata->bss, 2661 struct ieee80211_sub_if_data, 2662 u.ap); 2663 chanctx_conf = 2664 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2665 } 2666 if (sdata->wdev.use_4addr) 2667 break; 2668 fallthrough; 2669 case NL80211_IFTYPE_AP: 2670 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2671 /* DA BSSID SA */ 2672 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2673 2674 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2675 struct ieee80211_link_data *link; 2676 2677 link_id = sta->deflink.link_id; 2678 link = rcu_dereference(sdata->link[link_id]); 2679 if (WARN_ON(!link)) { 2680 ret = -ENOLINK; 2681 goto free; 2682 } 2683 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2684 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2685 (sta && sta->sta.mlo)) { 2686 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2687 } else { 2688 struct ieee80211_bss_conf *conf; 2689 2690 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2691 if (unlikely(!conf)) { 2692 ret = -ENOLINK; 2693 goto free; 2694 } 2695 2696 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2697 } 2698 2699 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2700 hdrlen = 24; 2701 break; 2702 #ifdef CONFIG_MAC80211_MESH 2703 case NL80211_IFTYPE_MESH_POINT: 2704 if (!is_multicast_ether_addr(skb->data)) { 2705 struct sta_info *next_hop; 2706 bool mpp_lookup = true; 2707 2708 mpath = mesh_path_lookup(sdata, skb->data); 2709 if (mpath) { 2710 mpp_lookup = false; 2711 next_hop = rcu_dereference(mpath->next_hop); 2712 if (!next_hop || 2713 !(mpath->flags & (MESH_PATH_ACTIVE | 2714 MESH_PATH_RESOLVING))) 2715 mpp_lookup = true; 2716 } 2717 2718 if (mpp_lookup) { 2719 mppath = mpp_path_lookup(sdata, skb->data); 2720 if (mppath) 2721 mppath->exp_time = jiffies; 2722 } 2723 2724 if (mppath && mpath) 2725 mesh_path_del(sdata, mpath->dst); 2726 } 2727 2728 /* 2729 * Use address extension if it is a packet from 2730 * another interface or if we know the destination 2731 * is being proxied by a portal (i.e. portal address 2732 * differs from proxied address) 2733 */ 2734 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2735 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2736 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2737 skb->data, skb->data + ETH_ALEN); 2738 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2739 NULL, NULL); 2740 } else { 2741 /* DS -> MBSS (802.11-2012 13.11.3.3). 2742 * For unicast with unknown forwarding information, 2743 * destination might be in the MBSS or if that fails 2744 * forwarded to another mesh gate. In either case 2745 * resolution will be handled in ieee80211_xmit(), so 2746 * leave the original DA. This also works for mcast */ 2747 const u8 *mesh_da = skb->data; 2748 2749 if (mppath) 2750 mesh_da = mppath->mpp; 2751 else if (mpath) 2752 mesh_da = mpath->dst; 2753 2754 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2755 mesh_da, sdata->vif.addr); 2756 if (is_multicast_ether_addr(mesh_da)) 2757 /* DA TA mSA AE:SA */ 2758 meshhdrlen = ieee80211_new_mesh_header( 2759 sdata, &mesh_hdr, 2760 skb->data + ETH_ALEN, NULL); 2761 else 2762 /* RA TA mDA mSA AE:DA SA */ 2763 meshhdrlen = ieee80211_new_mesh_header( 2764 sdata, &mesh_hdr, skb->data, 2765 skb->data + ETH_ALEN); 2766 2767 } 2768 2769 /* For injected frames, fill RA right away as nexthop lookup 2770 * will be skipped. 2771 */ 2772 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2773 is_zero_ether_addr(hdr.addr1)) 2774 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2775 break; 2776 #endif 2777 case NL80211_IFTYPE_STATION: 2778 /* we already did checks when looking up the RA STA */ 2779 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2780 2781 if (tdls_peer) { 2782 /* For TDLS only one link can be valid with peer STA */ 2783 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2784 struct ieee80211_link_data *link; 2785 2786 /* DA SA BSSID */ 2787 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2788 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2789 link = rcu_dereference(sdata->link[tdls_link_id]); 2790 if (WARN_ON_ONCE(!link)) { 2791 ret = -EINVAL; 2792 goto free; 2793 } 2794 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2795 hdrlen = 24; 2796 } else if (sdata->u.mgd.use_4addr && 2797 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2798 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2799 IEEE80211_FCTL_TODS); 2800 /* RA TA DA SA */ 2801 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2802 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2803 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2804 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2805 hdrlen = 30; 2806 } else { 2807 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2808 /* BSSID SA DA */ 2809 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2810 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2811 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2812 hdrlen = 24; 2813 } 2814 break; 2815 case NL80211_IFTYPE_OCB: 2816 /* DA SA BSSID */ 2817 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2818 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2819 eth_broadcast_addr(hdr.addr3); 2820 hdrlen = 24; 2821 break; 2822 case NL80211_IFTYPE_ADHOC: 2823 /* DA SA BSSID */ 2824 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2825 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2826 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2827 hdrlen = 24; 2828 break; 2829 default: 2830 ret = -EINVAL; 2831 goto free; 2832 } 2833 2834 if (!chanctx_conf) { 2835 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2836 ret = -ENOTCONN; 2837 goto free; 2838 } 2839 /* MLD transmissions must not rely on the band */ 2840 band = 0; 2841 } else { 2842 band = chanctx_conf->def.chan->band; 2843 } 2844 2845 multicast = is_multicast_ether_addr(hdr.addr1); 2846 2847 /* sta is always NULL for mesh */ 2848 if (sta) { 2849 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2850 wme_sta = sta->sta.wme; 2851 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2852 /* For mesh, the use of the QoS header is mandatory */ 2853 wme_sta = true; 2854 } 2855 2856 /* receiver does QoS (which also means we do) use it */ 2857 if (wme_sta) { 2858 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2859 hdrlen += 2; 2860 } 2861 2862 /* 2863 * Drop unicast frames to unauthorised stations unless they are 2864 * EAPOL frames from the local station. 2865 */ 2866 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2867 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2868 !multicast && !authorized && 2869 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2870 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2871 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2872 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2873 sdata->name, hdr.addr1); 2874 #endif 2875 2876 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2877 2878 ret = -EPERM; 2879 goto free; 2880 } 2881 2882 if (unlikely(!multicast && 2883 (sk_requests_wifi_status(skb->sk) || 2884 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2885 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2886 cookie); 2887 2888 /* 2889 * If the skb is shared we need to obtain our own copy. 2890 */ 2891 skb = skb_share_check(skb, GFP_ATOMIC); 2892 if (unlikely(!skb)) { 2893 ret = -ENOMEM; 2894 goto free; 2895 } 2896 2897 hdr.frame_control = fc; 2898 hdr.duration_id = 0; 2899 hdr.seq_ctrl = 0; 2900 2901 skip_header_bytes = ETH_HLEN; 2902 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2903 encaps_data = bridge_tunnel_header; 2904 encaps_len = sizeof(bridge_tunnel_header); 2905 skip_header_bytes -= 2; 2906 } else if (ethertype >= ETH_P_802_3_MIN) { 2907 encaps_data = rfc1042_header; 2908 encaps_len = sizeof(rfc1042_header); 2909 skip_header_bytes -= 2; 2910 } else { 2911 encaps_data = NULL; 2912 encaps_len = 0; 2913 } 2914 2915 skb_pull(skb, skip_header_bytes); 2916 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2917 2918 /* 2919 * So we need to modify the skb header and hence need a copy of 2920 * that. The head_need variable above doesn't, so far, include 2921 * the needed header space that we don't need right away. If we 2922 * can, then we don't reallocate right now but only after the 2923 * frame arrives at the master device (if it does...) 2924 * 2925 * If we cannot, however, then we will reallocate to include all 2926 * the ever needed space. Also, if we need to reallocate it anyway, 2927 * make it big enough for everything we may ever need. 2928 */ 2929 2930 if (head_need > 0 || skb_cloned(skb)) { 2931 head_need += IEEE80211_ENCRYPT_HEADROOM; 2932 head_need += local->tx_headroom; 2933 head_need = max_t(int, 0, head_need); 2934 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2935 ieee80211_free_txskb(&local->hw, skb); 2936 skb = NULL; 2937 return ERR_PTR(-ENOMEM); 2938 } 2939 } 2940 2941 if (encaps_data) 2942 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2943 2944 #ifdef CONFIG_MAC80211_MESH 2945 if (meshhdrlen > 0) 2946 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2947 #endif 2948 2949 if (ieee80211_is_data_qos(fc)) { 2950 __le16 *qos_control; 2951 2952 qos_control = skb_push(skb, 2); 2953 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2954 /* 2955 * Maybe we could actually set some fields here, for now just 2956 * initialise to zero to indicate no special operation. 2957 */ 2958 *qos_control = 0; 2959 } else 2960 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2961 2962 skb_reset_mac_header(skb); 2963 2964 info = IEEE80211_SKB_CB(skb); 2965 memset(info, 0, sizeof(*info)); 2966 2967 info->flags = info_flags; 2968 if (info_id) { 2969 info->status_data = info_id; 2970 info->status_data_idr = 1; 2971 } 2972 info->band = band; 2973 2974 if (likely(!cookie)) { 2975 ctrl_flags |= u32_encode_bits(link_id, 2976 IEEE80211_TX_CTRL_MLO_LINK); 2977 } else { 2978 unsigned int pre_conf_link_id; 2979 2980 /* 2981 * ctrl_flags already have been set by 2982 * ieee80211_tx_control_port(), here 2983 * we just sanity check that 2984 */ 2985 2986 pre_conf_link_id = u32_get_bits(ctrl_flags, 2987 IEEE80211_TX_CTRL_MLO_LINK); 2988 2989 if (pre_conf_link_id != link_id && 2990 link_id != IEEE80211_LINK_UNSPECIFIED) { 2991 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2992 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2993 sdata->name, hdr.addr1, 2994 pre_conf_link_id, link_id); 2995 #endif 2996 ret = -EINVAL; 2997 goto free; 2998 } 2999 } 3000 3001 info->control.flags = ctrl_flags; 3002 3003 return skb; 3004 free: 3005 kfree_skb(skb); 3006 return ERR_PTR(ret); 3007 } 3008 3009 /* 3010 * fast-xmit overview 3011 * 3012 * The core idea of this fast-xmit is to remove per-packet checks by checking 3013 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3014 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3015 * much less work can be done per packet. For example, fragmentation must be 3016 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3017 * in the code here. 3018 * 3019 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3020 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3021 * 3022 * The most difficult part of this is that when any of these assumptions 3023 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3024 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3025 * since the per-packet code no longer checks the conditions. This is reflected 3026 * by the calls to these functions throughout the rest of the code, and must be 3027 * maintained if any of the TX path checks change. 3028 */ 3029 3030 void ieee80211_check_fast_xmit(struct sta_info *sta) 3031 { 3032 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3033 struct ieee80211_local *local = sta->local; 3034 struct ieee80211_sub_if_data *sdata = sta->sdata; 3035 struct ieee80211_hdr *hdr = (void *)build.hdr; 3036 struct ieee80211_chanctx_conf *chanctx_conf; 3037 __le16 fc; 3038 3039 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3040 return; 3041 3042 if (ieee80211_vif_is_mesh(&sdata->vif)) 3043 mesh_fast_tx_flush_sta(sdata, sta); 3044 3045 /* Locking here protects both the pointer itself, and against concurrent 3046 * invocations winning data access races to, e.g., the key pointer that 3047 * is used. 3048 * Without it, the invocation of this function right after the key 3049 * pointer changes wouldn't be sufficient, as another CPU could access 3050 * the pointer, then stall, and then do the cache update after the CPU 3051 * that invalidated the key. 3052 * With the locking, such scenarios cannot happen as the check for the 3053 * key and the fast-tx assignment are done atomically, so the CPU that 3054 * modifies the key will either wait or other one will see the key 3055 * cleared/changed already. 3056 */ 3057 spin_lock_bh(&sta->lock); 3058 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3059 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3060 sdata->vif.type == NL80211_IFTYPE_STATION) 3061 goto out; 3062 3063 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3064 goto out; 3065 3066 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3067 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3068 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3069 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3070 goto out; 3071 3072 if (sdata->noack_map) 3073 goto out; 3074 3075 /* fast-xmit doesn't handle fragmentation at all */ 3076 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3077 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3078 goto out; 3079 3080 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3081 rcu_read_lock(); 3082 chanctx_conf = 3083 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3084 if (!chanctx_conf) { 3085 rcu_read_unlock(); 3086 goto out; 3087 } 3088 build.band = chanctx_conf->def.chan->band; 3089 rcu_read_unlock(); 3090 } else { 3091 /* MLD transmissions must not rely on the band */ 3092 build.band = 0; 3093 } 3094 3095 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3096 3097 switch (sdata->vif.type) { 3098 case NL80211_IFTYPE_ADHOC: 3099 /* DA SA BSSID */ 3100 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3101 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3102 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3103 build.hdr_len = 24; 3104 break; 3105 case NL80211_IFTYPE_STATION: 3106 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3107 /* For TDLS only one link can be valid with peer STA */ 3108 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3109 struct ieee80211_link_data *link; 3110 3111 /* DA SA BSSID */ 3112 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3113 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3114 rcu_read_lock(); 3115 link = rcu_dereference(sdata->link[tdls_link_id]); 3116 if (!WARN_ON_ONCE(!link)) 3117 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3118 rcu_read_unlock(); 3119 build.hdr_len = 24; 3120 break; 3121 } 3122 3123 if (sdata->u.mgd.use_4addr) { 3124 /* non-regular ethertype cannot use the fastpath */ 3125 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3126 IEEE80211_FCTL_TODS); 3127 /* RA TA DA SA */ 3128 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3129 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3130 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3131 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3132 build.hdr_len = 30; 3133 break; 3134 } 3135 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3136 /* BSSID SA DA */ 3137 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3138 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3139 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3140 build.hdr_len = 24; 3141 break; 3142 case NL80211_IFTYPE_AP_VLAN: 3143 if (sdata->wdev.use_4addr) { 3144 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3145 IEEE80211_FCTL_TODS); 3146 /* RA TA DA SA */ 3147 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3148 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3149 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3150 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3151 build.hdr_len = 30; 3152 break; 3153 } 3154 fallthrough; 3155 case NL80211_IFTYPE_AP: 3156 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3157 /* DA BSSID SA */ 3158 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3159 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3160 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3161 } else { 3162 unsigned int link_id = sta->deflink.link_id; 3163 struct ieee80211_link_data *link; 3164 3165 rcu_read_lock(); 3166 link = rcu_dereference(sdata->link[link_id]); 3167 if (WARN_ON(!link)) { 3168 rcu_read_unlock(); 3169 goto out; 3170 } 3171 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3172 rcu_read_unlock(); 3173 } 3174 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3175 build.hdr_len = 24; 3176 break; 3177 default: 3178 /* not handled on fast-xmit */ 3179 goto out; 3180 } 3181 3182 if (sta->sta.wme) { 3183 build.hdr_len += 2; 3184 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3185 } 3186 3187 /* We store the key here so there's no point in using rcu_dereference() 3188 * but that's fine because the code that changes the pointers will call 3189 * this function after doing so. For a single CPU that would be enough, 3190 * for multiple see the comment above. 3191 */ 3192 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3193 if (!build.key) 3194 build.key = rcu_access_pointer(sdata->default_unicast_key); 3195 if (build.key) { 3196 bool gen_iv, iv_spc, mmic; 3197 3198 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3199 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3200 mmic = build.key->conf.flags & 3201 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3202 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3203 3204 /* don't handle software crypto */ 3205 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3206 goto out; 3207 3208 /* Key is being removed */ 3209 if (build.key->flags & KEY_FLAG_TAINTED) 3210 goto out; 3211 3212 switch (build.key->conf.cipher) { 3213 case WLAN_CIPHER_SUITE_CCMP: 3214 case WLAN_CIPHER_SUITE_CCMP_256: 3215 if (gen_iv) 3216 build.pn_offs = build.hdr_len; 3217 if (gen_iv || iv_spc) 3218 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3219 break; 3220 case WLAN_CIPHER_SUITE_GCMP: 3221 case WLAN_CIPHER_SUITE_GCMP_256: 3222 if (gen_iv) 3223 build.pn_offs = build.hdr_len; 3224 if (gen_iv || iv_spc) 3225 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3226 break; 3227 case WLAN_CIPHER_SUITE_TKIP: 3228 /* cannot handle MMIC or IV generation in xmit-fast */ 3229 if (mmic || gen_iv) 3230 goto out; 3231 if (iv_spc) 3232 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3233 break; 3234 case WLAN_CIPHER_SUITE_WEP40: 3235 case WLAN_CIPHER_SUITE_WEP104: 3236 /* cannot handle IV generation in fast-xmit */ 3237 if (gen_iv) 3238 goto out; 3239 if (iv_spc) 3240 build.hdr_len += IEEE80211_WEP_IV_LEN; 3241 break; 3242 case WLAN_CIPHER_SUITE_AES_CMAC: 3243 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3244 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3245 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3246 WARN(1, 3247 "management cipher suite 0x%x enabled for data\n", 3248 build.key->conf.cipher); 3249 goto out; 3250 default: 3251 /* we don't know how to generate IVs for this at all */ 3252 if (WARN_ON(gen_iv)) 3253 goto out; 3254 } 3255 3256 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3257 } 3258 3259 hdr->frame_control = fc; 3260 3261 memcpy(build.hdr + build.hdr_len, 3262 rfc1042_header, sizeof(rfc1042_header)); 3263 build.hdr_len += sizeof(rfc1042_header); 3264 3265 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3266 /* if the kmemdup fails, continue w/o fast_tx */ 3267 3268 out: 3269 /* we might have raced against another call to this function */ 3270 old = rcu_dereference_protected(sta->fast_tx, 3271 lockdep_is_held(&sta->lock)); 3272 rcu_assign_pointer(sta->fast_tx, fast_tx); 3273 if (old) 3274 kfree_rcu(old, rcu_head); 3275 spin_unlock_bh(&sta->lock); 3276 } 3277 3278 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3279 { 3280 struct sta_info *sta; 3281 3282 rcu_read_lock(); 3283 list_for_each_entry_rcu(sta, &local->sta_list, list) 3284 ieee80211_check_fast_xmit(sta); 3285 rcu_read_unlock(); 3286 } 3287 3288 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3289 { 3290 struct ieee80211_local *local = sdata->local; 3291 struct sta_info *sta; 3292 3293 rcu_read_lock(); 3294 3295 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3296 if (sdata != sta->sdata && 3297 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3298 continue; 3299 ieee80211_check_fast_xmit(sta); 3300 } 3301 3302 rcu_read_unlock(); 3303 } 3304 3305 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3306 { 3307 struct ieee80211_fast_tx *fast_tx; 3308 3309 spin_lock_bh(&sta->lock); 3310 fast_tx = rcu_dereference_protected(sta->fast_tx, 3311 lockdep_is_held(&sta->lock)); 3312 RCU_INIT_POINTER(sta->fast_tx, NULL); 3313 spin_unlock_bh(&sta->lock); 3314 3315 if (fast_tx) 3316 kfree_rcu(fast_tx, rcu_head); 3317 } 3318 3319 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3320 struct sk_buff *skb, int headroom) 3321 { 3322 if (skb_headroom(skb) < headroom) { 3323 I802_DEBUG_INC(local->tx_expand_skb_head); 3324 3325 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3326 wiphy_debug(local->hw.wiphy, 3327 "failed to reallocate TX buffer\n"); 3328 return false; 3329 } 3330 } 3331 3332 return true; 3333 } 3334 3335 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3336 struct ieee80211_fast_tx *fast_tx, 3337 struct sk_buff *skb) 3338 { 3339 struct ieee80211_local *local = sdata->local; 3340 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3341 struct ieee80211_hdr *hdr; 3342 struct ethhdr *amsdu_hdr; 3343 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3344 int subframe_len = skb->len - hdr_len; 3345 void *data; 3346 u8 *qc, *h_80211_src, *h_80211_dst; 3347 const u8 *bssid; 3348 3349 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3350 return false; 3351 3352 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3353 return true; 3354 3355 if (!ieee80211_amsdu_realloc_pad(local, skb, 3356 sizeof(*amsdu_hdr) + 3357 local->hw.extra_tx_headroom)) 3358 return false; 3359 3360 data = skb_push(skb, sizeof(*amsdu_hdr)); 3361 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3362 hdr = data; 3363 amsdu_hdr = data + hdr_len; 3364 /* h_80211_src/dst is addr* field within hdr */ 3365 h_80211_src = data + fast_tx->sa_offs; 3366 h_80211_dst = data + fast_tx->da_offs; 3367 3368 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3369 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3370 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3371 3372 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3373 * fields needs to be changed to BSSID for A-MSDU frames depending 3374 * on FromDS/ToDS values. 3375 */ 3376 switch (sdata->vif.type) { 3377 case NL80211_IFTYPE_STATION: 3378 bssid = sdata->vif.cfg.ap_addr; 3379 break; 3380 case NL80211_IFTYPE_AP: 3381 case NL80211_IFTYPE_AP_VLAN: 3382 bssid = sdata->vif.addr; 3383 break; 3384 default: 3385 bssid = NULL; 3386 } 3387 3388 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3389 ether_addr_copy(h_80211_src, bssid); 3390 3391 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3392 ether_addr_copy(h_80211_dst, bssid); 3393 3394 qc = ieee80211_get_qos_ctl(hdr); 3395 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3396 3397 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3398 3399 return true; 3400 } 3401 3402 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3403 struct sta_info *sta, 3404 struct ieee80211_fast_tx *fast_tx, 3405 struct sk_buff *skb, 3406 const u8 *da, const u8 *sa) 3407 { 3408 struct ieee80211_local *local = sdata->local; 3409 struct fq *fq = &local->fq; 3410 struct fq_tin *tin; 3411 struct fq_flow *flow; 3412 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3413 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3414 struct txq_info *txqi; 3415 struct sk_buff **frag_tail, *head; 3416 int subframe_len = skb->len - ETH_ALEN; 3417 u8 max_subframes = sta->sta.max_amsdu_subframes; 3418 int max_frags = local->hw.max_tx_fragments; 3419 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3420 int orig_truesize; 3421 u32 flow_idx; 3422 __be16 len; 3423 void *data; 3424 bool ret = false; 3425 unsigned int orig_len; 3426 int n = 2, nfrags, pad = 0; 3427 u16 hdrlen; 3428 3429 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3430 return false; 3431 3432 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3433 return false; 3434 3435 if (ieee80211_vif_is_mesh(&sdata->vif)) 3436 return false; 3437 3438 if (skb_is_gso(skb)) 3439 return false; 3440 3441 if (!txq) 3442 return false; 3443 3444 txqi = to_txq_info(txq); 3445 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3446 return false; 3447 3448 if (sta->sta.cur->max_rc_amsdu_len) 3449 max_amsdu_len = min_t(int, max_amsdu_len, 3450 sta->sta.cur->max_rc_amsdu_len); 3451 3452 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3453 max_amsdu_len = min_t(int, max_amsdu_len, 3454 sta->sta.cur->max_tid_amsdu_len[tid]); 3455 3456 flow_idx = fq_flow_idx(fq, skb); 3457 3458 spin_lock_bh(&fq->lock); 3459 3460 /* TODO: Ideally aggregation should be done on dequeue to remain 3461 * responsive to environment changes. 3462 */ 3463 3464 tin = &txqi->tin; 3465 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3466 head = skb_peek_tail(&flow->queue); 3467 if (!head || skb_is_gso(head)) 3468 goto out; 3469 3470 orig_truesize = head->truesize; 3471 orig_len = head->len; 3472 3473 if (skb->len + head->len > max_amsdu_len) 3474 goto out; 3475 3476 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3477 nfrags += 1 + skb_shinfo(head)->nr_frags; 3478 frag_tail = &skb_shinfo(head)->frag_list; 3479 while (*frag_tail) { 3480 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3481 frag_tail = &(*frag_tail)->next; 3482 n++; 3483 } 3484 3485 if (max_subframes && n > max_subframes) 3486 goto out; 3487 3488 if (max_frags && nfrags > max_frags) 3489 goto out; 3490 3491 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3492 goto out; 3493 3494 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3495 goto out; 3496 3497 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3498 * and frag_tail should be &skb_shinfo(head)->frag_list. 3499 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3500 * Reload frag_tail to have it pointing to the correct place. 3501 */ 3502 if (n == 2) 3503 frag_tail = &skb_shinfo(head)->frag_list; 3504 3505 /* 3506 * Pad out the previous subframe to a multiple of 4 by adding the 3507 * padding to the next one, that's being added. Note that head->len 3508 * is the length of the full A-MSDU, but that works since each time 3509 * we add a new subframe we pad out the previous one to a multiple 3510 * of 4 and thus it no longer matters in the next round. 3511 */ 3512 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3513 if ((head->len - hdrlen) & 3) 3514 pad = 4 - ((head->len - hdrlen) & 3); 3515 3516 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3517 2 + pad)) 3518 goto out_recalc; 3519 3520 ret = true; 3521 data = skb_push(skb, ETH_ALEN + 2); 3522 ether_addr_copy(data, da); 3523 ether_addr_copy(data + ETH_ALEN, sa); 3524 3525 data += 2 * ETH_ALEN; 3526 len = cpu_to_be16(subframe_len); 3527 memcpy(data, &len, 2); 3528 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3529 3530 memset(skb_push(skb, pad), 0, pad); 3531 3532 head->len += skb->len; 3533 head->data_len += skb->len; 3534 *frag_tail = skb; 3535 3536 out_recalc: 3537 fq->memory_usage += head->truesize - orig_truesize; 3538 if (head->len != orig_len) { 3539 flow->backlog += head->len - orig_len; 3540 tin->backlog_bytes += head->len - orig_len; 3541 } 3542 out: 3543 spin_unlock_bh(&fq->lock); 3544 3545 return ret; 3546 } 3547 3548 /* 3549 * Can be called while the sta lock is held. Anything that can cause packets to 3550 * be generated will cause deadlock! 3551 */ 3552 static ieee80211_tx_result 3553 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3554 struct sta_info *sta, u8 pn_offs, 3555 struct ieee80211_key *key, 3556 struct ieee80211_tx_data *tx) 3557 { 3558 struct sk_buff *skb = tx->skb; 3559 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3560 struct ieee80211_hdr *hdr = (void *)skb->data; 3561 u8 tid = IEEE80211_NUM_TIDS; 3562 3563 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3564 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3565 return TX_DROP; 3566 3567 if (key) 3568 info->control.hw_key = &key->conf; 3569 3570 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3571 3572 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3573 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3574 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3575 } else { 3576 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3577 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3578 sdata->sequence_number += 0x10; 3579 } 3580 3581 if (skb_shinfo(skb)->gso_size) 3582 sta->deflink.tx_stats.msdu[tid] += 3583 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3584 else 3585 sta->deflink.tx_stats.msdu[tid]++; 3586 3587 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3588 3589 /* statistics normally done by ieee80211_tx_h_stats (but that 3590 * has to consider fragmentation, so is more complex) 3591 */ 3592 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3593 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3594 3595 if (pn_offs) { 3596 u64 pn; 3597 u8 *crypto_hdr = skb->data + pn_offs; 3598 3599 switch (key->conf.cipher) { 3600 case WLAN_CIPHER_SUITE_CCMP: 3601 case WLAN_CIPHER_SUITE_CCMP_256: 3602 case WLAN_CIPHER_SUITE_GCMP: 3603 case WLAN_CIPHER_SUITE_GCMP_256: 3604 pn = atomic64_inc_return(&key->conf.tx_pn); 3605 crypto_hdr[0] = pn; 3606 crypto_hdr[1] = pn >> 8; 3607 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3608 crypto_hdr[4] = pn >> 16; 3609 crypto_hdr[5] = pn >> 24; 3610 crypto_hdr[6] = pn >> 32; 3611 crypto_hdr[7] = pn >> 40; 3612 break; 3613 } 3614 } 3615 3616 return TX_CONTINUE; 3617 } 3618 3619 static netdev_features_t 3620 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3621 { 3622 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3623 return sdata->vif.netdev_features; 3624 3625 if (!sdata->bss) 3626 return 0; 3627 3628 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3629 return sdata->vif.netdev_features; 3630 } 3631 3632 static struct sk_buff * 3633 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3634 { 3635 if (skb_is_gso(skb)) { 3636 struct sk_buff *segs; 3637 3638 segs = skb_gso_segment(skb, features); 3639 if (!segs) 3640 return skb; 3641 if (IS_ERR(segs)) 3642 goto free; 3643 3644 consume_skb(skb); 3645 return segs; 3646 } 3647 3648 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3649 goto free; 3650 3651 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3652 int ofs = skb_checksum_start_offset(skb); 3653 3654 if (skb->encapsulation) 3655 skb_set_inner_transport_header(skb, ofs); 3656 else 3657 skb_set_transport_header(skb, ofs); 3658 3659 if (skb_csum_hwoffload_help(skb, features)) 3660 goto free; 3661 } 3662 3663 skb_mark_not_on_list(skb); 3664 return skb; 3665 3666 free: 3667 kfree_skb(skb); 3668 return NULL; 3669 } 3670 3671 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3672 struct sta_info *sta, 3673 struct ieee80211_fast_tx *fast_tx, 3674 struct sk_buff *skb, bool ampdu, 3675 const u8 *da, const u8 *sa) 3676 { 3677 struct ieee80211_local *local = sdata->local; 3678 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3679 struct ieee80211_tx_info *info; 3680 struct ieee80211_tx_data tx; 3681 ieee80211_tx_result r; 3682 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3683 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3684 3685 skb = skb_share_check(skb, GFP_ATOMIC); 3686 if (unlikely(!skb)) 3687 return; 3688 3689 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3690 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3691 return; 3692 3693 /* will not be crypto-handled beyond what we do here, so use false 3694 * as the may-encrypt argument for the resize to not account for 3695 * more room than we already have in 'extra_head' 3696 */ 3697 if (unlikely(ieee80211_skb_resize(sdata, skb, 3698 max_t(int, extra_head + hw_headroom - 3699 skb_headroom(skb), 0), 3700 ENCRYPT_NO))) 3701 goto free; 3702 3703 hdr = skb_push(skb, extra_head); 3704 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3705 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3706 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3707 3708 info = IEEE80211_SKB_CB(skb); 3709 memset(info, 0, sizeof(*info)); 3710 info->band = fast_tx->band; 3711 info->control.vif = &sdata->vif; 3712 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3713 IEEE80211_TX_CTL_DONTFRAG; 3714 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3715 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3716 IEEE80211_TX_CTRL_MLO_LINK); 3717 3718 #ifdef CONFIG_MAC80211_DEBUGFS 3719 if (local->force_tx_status) 3720 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3721 #endif 3722 3723 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3724 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3725 3726 *ieee80211_get_qos_ctl(hdr) = tid; 3727 } 3728 3729 __skb_queue_head_init(&tx.skbs); 3730 3731 tx.flags = IEEE80211_TX_UNICAST; 3732 tx.local = local; 3733 tx.sdata = sdata; 3734 tx.sta = sta; 3735 tx.key = fast_tx->key; 3736 3737 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3738 return; 3739 3740 tx.skb = skb; 3741 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3742 fast_tx->key, &tx); 3743 tx.skb = NULL; 3744 if (r == TX_DROP) { 3745 tx.sdata->tx_handlers_drop++; 3746 goto free; 3747 } 3748 3749 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3750 sdata = container_of(sdata->bss, 3751 struct ieee80211_sub_if_data, u.ap); 3752 3753 __skb_queue_tail(&tx.skbs, skb); 3754 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3755 return; 3756 3757 free: 3758 kfree_skb(skb); 3759 } 3760 3761 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3762 struct sta_info *sta, 3763 struct ieee80211_fast_tx *fast_tx, 3764 struct sk_buff *skb) 3765 { 3766 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3767 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3768 struct tid_ampdu_tx *tid_tx = NULL; 3769 struct sk_buff *next; 3770 struct ethhdr eth; 3771 u8 tid = IEEE80211_NUM_TIDS; 3772 3773 /* control port protocol needs a lot of special handling */ 3774 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3775 return false; 3776 3777 /* only RFC 1042 SNAP */ 3778 if (ethertype < ETH_P_802_3_MIN) 3779 return false; 3780 3781 /* don't handle TX status request here either */ 3782 if (sk_requests_wifi_status(skb->sk)) 3783 return false; 3784 3785 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3786 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3787 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3788 if (tid_tx) { 3789 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3790 return false; 3791 if (tid_tx->timeout) 3792 tid_tx->last_tx = jiffies; 3793 } 3794 } 3795 3796 memcpy(ð, skb->data, ETH_HLEN - 2); 3797 3798 /* after this point (skb is modified) we cannot return false */ 3799 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3800 if (!skb) 3801 return true; 3802 3803 skb_list_walk_safe(skb, skb, next) { 3804 skb_mark_not_on_list(skb); 3805 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3806 eth.h_dest, eth.h_source); 3807 } 3808 3809 return true; 3810 } 3811 3812 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3813 struct ieee80211_txq *txq) 3814 { 3815 struct ieee80211_local *local = hw_to_local(hw); 3816 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3817 struct ieee80211_hdr *hdr; 3818 struct sk_buff *skb = NULL; 3819 struct fq *fq = &local->fq; 3820 struct fq_tin *tin = &txqi->tin; 3821 struct ieee80211_tx_info *info; 3822 struct ieee80211_tx_data tx; 3823 ieee80211_tx_result r; 3824 struct ieee80211_vif *vif = txq->vif; 3825 int q = vif->hw_queue[txq->ac]; 3826 unsigned long flags; 3827 bool q_stopped; 3828 3829 WARN_ON_ONCE(softirq_count() == 0); 3830 3831 if (!ieee80211_txq_airtime_check(hw, txq)) 3832 return NULL; 3833 3834 begin: 3835 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3836 q_stopped = local->queue_stop_reasons[q]; 3837 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3838 3839 if (unlikely(q_stopped)) { 3840 /* mark for waking later */ 3841 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3842 return NULL; 3843 } 3844 3845 spin_lock_bh(&fq->lock); 3846 3847 /* Make sure fragments stay together. */ 3848 skb = __skb_dequeue(&txqi->frags); 3849 if (unlikely(skb)) { 3850 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3851 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3852 goto out; 3853 IEEE80211_SKB_CB(skb)->control.flags &= 3854 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3855 } else { 3856 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3857 goto out; 3858 3859 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3860 } 3861 3862 if (!skb) 3863 goto out; 3864 3865 spin_unlock_bh(&fq->lock); 3866 3867 hdr = (struct ieee80211_hdr *)skb->data; 3868 info = IEEE80211_SKB_CB(skb); 3869 3870 memset(&tx, 0, sizeof(tx)); 3871 __skb_queue_head_init(&tx.skbs); 3872 tx.local = local; 3873 tx.skb = skb; 3874 tx.sdata = vif_to_sdata(info->control.vif); 3875 3876 if (txq->sta) { 3877 tx.sta = container_of(txq->sta, struct sta_info, sta); 3878 /* 3879 * Drop unicast frames to unauthorised stations unless they are 3880 * injected frames or EAPOL frames from the local station. 3881 */ 3882 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3883 ieee80211_is_data(hdr->frame_control) && 3884 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3885 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3886 !is_multicast_ether_addr(hdr->addr1) && 3887 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3888 (!(info->control.flags & 3889 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3890 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3891 NULL)))) { 3892 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3893 ieee80211_free_txskb(&local->hw, skb); 3894 goto begin; 3895 } 3896 } 3897 3898 /* 3899 * The key can be removed while the packet was queued, so need to call 3900 * this here to get the current key. 3901 */ 3902 info->control.hw_key = NULL; 3903 r = ieee80211_tx_h_select_key(&tx); 3904 if (r != TX_CONTINUE) { 3905 ieee80211_free_txskb(&local->hw, skb); 3906 goto begin; 3907 } 3908 3909 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3910 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3911 IEEE80211_TX_CTL_DONTFRAG); 3912 3913 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3914 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3915 r = ieee80211_tx_h_rate_ctrl(&tx); 3916 if (r != TX_CONTINUE) { 3917 ieee80211_free_txskb(&local->hw, skb); 3918 goto begin; 3919 } 3920 } 3921 goto encap_out; 3922 } 3923 3924 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3925 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3926 sta); 3927 u8 pn_offs = 0; 3928 3929 if (tx.key && 3930 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3931 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3932 3933 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3934 tx.key, &tx); 3935 if (r != TX_CONTINUE) { 3936 ieee80211_free_txskb(&local->hw, skb); 3937 goto begin; 3938 } 3939 } else { 3940 if (invoke_tx_handlers_late(&tx)) 3941 goto begin; 3942 3943 skb = __skb_dequeue(&tx.skbs); 3944 info = IEEE80211_SKB_CB(skb); 3945 3946 if (!skb_queue_empty(&tx.skbs)) { 3947 spin_lock_bh(&fq->lock); 3948 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3949 spin_unlock_bh(&fq->lock); 3950 } 3951 } 3952 3953 if (skb_has_frag_list(skb) && 3954 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3955 if (skb_linearize(skb)) { 3956 ieee80211_free_txskb(&local->hw, skb); 3957 goto begin; 3958 } 3959 } 3960 3961 switch (tx.sdata->vif.type) { 3962 case NL80211_IFTYPE_MONITOR: 3963 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 3964 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 3965 vif = &tx.sdata->vif; 3966 break; 3967 } 3968 tx.sdata = rcu_dereference(local->monitor_sdata); 3969 if (tx.sdata && 3970 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 3971 vif = &tx.sdata->vif; 3972 info->hw_queue = 3973 vif->hw_queue[skb_get_queue_mapping(skb)]; 3974 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3975 ieee80211_free_txskb(&local->hw, skb); 3976 goto begin; 3977 } else { 3978 info->control.vif = NULL; 3979 return skb; 3980 } 3981 break; 3982 case NL80211_IFTYPE_AP_VLAN: 3983 tx.sdata = container_of(tx.sdata->bss, 3984 struct ieee80211_sub_if_data, u.ap); 3985 fallthrough; 3986 default: 3987 vif = &tx.sdata->vif; 3988 break; 3989 } 3990 3991 encap_out: 3992 info->control.vif = vif; 3993 3994 if (tx.sta && 3995 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3996 bool ampdu = txq->ac != IEEE80211_AC_VO; 3997 u32 airtime; 3998 3999 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 4000 skb->len, ampdu); 4001 if (airtime) { 4002 airtime = ieee80211_info_set_tx_time_est(info, airtime); 4003 ieee80211_sta_update_pending_airtime(local, tx.sta, 4004 txq->ac, 4005 airtime, 4006 false); 4007 } 4008 } 4009 4010 return skb; 4011 4012 out: 4013 spin_unlock_bh(&fq->lock); 4014 4015 return skb; 4016 } 4017 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4018 4019 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4020 { 4021 struct airtime_info *air_info = &sta->airtime[ac]; 4022 4023 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4024 } 4025 4026 static void 4027 ieee80211_txq_set_active(struct txq_info *txqi) 4028 { 4029 struct sta_info *sta; 4030 4031 if (!txqi->txq.sta) 4032 return; 4033 4034 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4035 sta->airtime[txqi->txq.ac].last_active = jiffies; 4036 } 4037 4038 static bool 4039 ieee80211_txq_keep_active(struct txq_info *txqi) 4040 { 4041 struct sta_info *sta; 4042 4043 if (!txqi->txq.sta) 4044 return false; 4045 4046 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4047 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4048 return false; 4049 4050 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4051 } 4052 4053 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4054 { 4055 struct ieee80211_local *local = hw_to_local(hw); 4056 struct ieee80211_txq *ret = NULL; 4057 struct txq_info *txqi = NULL, *head = NULL; 4058 bool found_eligible_txq = false; 4059 4060 spin_lock_bh(&local->active_txq_lock[ac]); 4061 4062 if (!local->schedule_round[ac]) 4063 goto out; 4064 4065 begin: 4066 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4067 struct txq_info, 4068 schedule_order); 4069 if (!txqi) 4070 goto out; 4071 4072 if (txqi == head) { 4073 if (!found_eligible_txq) 4074 goto out; 4075 else 4076 found_eligible_txq = false; 4077 } 4078 4079 if (!head) 4080 head = txqi; 4081 4082 if (txqi->txq.sta) { 4083 struct sta_info *sta = container_of(txqi->txq.sta, 4084 struct sta_info, sta); 4085 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4086 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4087 4088 if (aql_check) 4089 found_eligible_txq = true; 4090 4091 if (deficit < 0) 4092 sta->airtime[txqi->txq.ac].deficit += 4093 sta->airtime_weight; 4094 4095 if (deficit < 0 || !aql_check) { 4096 list_move_tail(&txqi->schedule_order, 4097 &local->active_txqs[txqi->txq.ac]); 4098 goto begin; 4099 } 4100 } 4101 4102 if (txqi->schedule_round == local->schedule_round[ac]) 4103 goto out; 4104 4105 list_del_init(&txqi->schedule_order); 4106 txqi->schedule_round = local->schedule_round[ac]; 4107 ret = &txqi->txq; 4108 4109 out: 4110 spin_unlock_bh(&local->active_txq_lock[ac]); 4111 return ret; 4112 } 4113 EXPORT_SYMBOL(ieee80211_next_txq); 4114 4115 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4116 struct ieee80211_txq *txq, 4117 bool force) 4118 { 4119 struct ieee80211_local *local = hw_to_local(hw); 4120 struct txq_info *txqi = to_txq_info(txq); 4121 bool has_queue; 4122 4123 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4124 4125 has_queue = force || 4126 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4127 txq_has_queue(txq)); 4128 if (list_empty(&txqi->schedule_order) && 4129 (has_queue || ieee80211_txq_keep_active(txqi))) { 4130 /* If airtime accounting is active, always enqueue STAs at the 4131 * head of the list to ensure that they only get moved to the 4132 * back by the airtime DRR scheduler once they have a negative 4133 * deficit. A station that already has a negative deficit will 4134 * get immediately moved to the back of the list on the next 4135 * call to ieee80211_next_txq(). 4136 */ 4137 if (txqi->txq.sta && local->airtime_flags && has_queue && 4138 wiphy_ext_feature_isset(local->hw.wiphy, 4139 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4140 list_add(&txqi->schedule_order, 4141 &local->active_txqs[txq->ac]); 4142 else 4143 list_add_tail(&txqi->schedule_order, 4144 &local->active_txqs[txq->ac]); 4145 if (has_queue) 4146 ieee80211_txq_set_active(txqi); 4147 } 4148 4149 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4150 } 4151 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4152 4153 DEFINE_STATIC_KEY_FALSE(aql_disable); 4154 4155 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4156 struct ieee80211_txq *txq) 4157 { 4158 struct sta_info *sta; 4159 struct ieee80211_local *local = hw_to_local(hw); 4160 4161 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4162 return true; 4163 4164 if (static_branch_unlikely(&aql_disable)) 4165 return true; 4166 4167 if (!txq->sta) 4168 return true; 4169 4170 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4171 return true; 4172 4173 sta = container_of(txq->sta, struct sta_info, sta); 4174 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4175 sta->airtime[txq->ac].aql_limit_low) 4176 return true; 4177 4178 if (atomic_read(&local->aql_total_pending_airtime) < 4179 local->aql_threshold && 4180 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4181 sta->airtime[txq->ac].aql_limit_high) 4182 return true; 4183 4184 return false; 4185 } 4186 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4187 4188 static bool 4189 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4190 { 4191 unsigned int num_txq = 0; 4192 struct txq_info *txq; 4193 u32 aql_limit; 4194 4195 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4196 return true; 4197 4198 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4199 num_txq++; 4200 4201 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4202 local->aql_txq_limit_high[ac]; 4203 4204 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4205 } 4206 4207 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4208 struct ieee80211_txq *txq) 4209 { 4210 struct ieee80211_local *local = hw_to_local(hw); 4211 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4212 struct sta_info *sta; 4213 u8 ac = txq->ac; 4214 4215 spin_lock_bh(&local->active_txq_lock[ac]); 4216 4217 if (!txqi->txq.sta) 4218 goto out; 4219 4220 if (list_empty(&txqi->schedule_order)) 4221 goto out; 4222 4223 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4224 goto out; 4225 4226 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4227 schedule_order) { 4228 if (iter == txqi) 4229 break; 4230 4231 if (!iter->txq.sta) { 4232 list_move_tail(&iter->schedule_order, 4233 &local->active_txqs[ac]); 4234 continue; 4235 } 4236 sta = container_of(iter->txq.sta, struct sta_info, sta); 4237 if (ieee80211_sta_deficit(sta, ac) < 0) 4238 sta->airtime[ac].deficit += sta->airtime_weight; 4239 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4240 } 4241 4242 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4243 if (sta->airtime[ac].deficit >= 0) 4244 goto out; 4245 4246 sta->airtime[ac].deficit += sta->airtime_weight; 4247 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4248 spin_unlock_bh(&local->active_txq_lock[ac]); 4249 4250 return false; 4251 out: 4252 if (!list_empty(&txqi->schedule_order)) 4253 list_del_init(&txqi->schedule_order); 4254 spin_unlock_bh(&local->active_txq_lock[ac]); 4255 4256 return true; 4257 } 4258 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4259 4260 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4261 { 4262 struct ieee80211_local *local = hw_to_local(hw); 4263 4264 spin_lock_bh(&local->active_txq_lock[ac]); 4265 4266 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4267 local->schedule_round[ac]++; 4268 if (!local->schedule_round[ac]) 4269 local->schedule_round[ac]++; 4270 } else { 4271 local->schedule_round[ac] = 0; 4272 } 4273 4274 spin_unlock_bh(&local->active_txq_lock[ac]); 4275 } 4276 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4277 4278 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4279 struct net_device *dev, 4280 u32 info_flags, 4281 u32 ctrl_flags, 4282 u64 *cookie) 4283 { 4284 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4285 struct ieee80211_local *local = sdata->local; 4286 struct sta_info *sta; 4287 struct sk_buff *next; 4288 int len = skb->len; 4289 4290 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4291 kfree_skb(skb); 4292 return; 4293 } 4294 4295 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4296 4297 rcu_read_lock(); 4298 4299 if (ieee80211_vif_is_mesh(&sdata->vif) && 4300 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4301 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4302 goto out; 4303 4304 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4305 goto out_free; 4306 4307 if (IS_ERR(sta)) 4308 sta = NULL; 4309 4310 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4311 ieee80211_aggr_check(sdata, sta, skb); 4312 4313 if (sta) { 4314 struct ieee80211_fast_tx *fast_tx; 4315 4316 fast_tx = rcu_dereference(sta->fast_tx); 4317 4318 if (fast_tx && 4319 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4320 goto out; 4321 } 4322 4323 /* the frame could be fragmented, software-encrypted, and other 4324 * things so we cannot really handle checksum or GSO offload. 4325 * fix it up in software before we handle anything else. 4326 */ 4327 skb = ieee80211_tx_skb_fixup(skb, 0); 4328 if (!skb) { 4329 len = 0; 4330 goto out; 4331 } 4332 4333 skb_list_walk_safe(skb, skb, next) { 4334 skb_mark_not_on_list(skb); 4335 4336 if (skb->protocol == sdata->control_port_protocol) 4337 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4338 4339 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4340 sta, ctrl_flags, cookie); 4341 if (IS_ERR(skb)) { 4342 kfree_skb_list(next); 4343 goto out; 4344 } 4345 4346 dev_sw_netstats_tx_add(dev, 1, skb->len); 4347 4348 ieee80211_xmit(sdata, sta, skb); 4349 } 4350 goto out; 4351 out_free: 4352 kfree_skb(skb); 4353 len = 0; 4354 out: 4355 if (len) 4356 ieee80211_tpt_led_trig_tx(local, len); 4357 rcu_read_unlock(); 4358 } 4359 4360 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4361 { 4362 struct ethhdr *eth; 4363 int err; 4364 4365 err = skb_ensure_writable(skb, ETH_HLEN); 4366 if (unlikely(err)) 4367 return err; 4368 4369 eth = (void *)skb->data; 4370 ether_addr_copy(eth->h_dest, sta->sta.addr); 4371 4372 return 0; 4373 } 4374 4375 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4376 struct net_device *dev) 4377 { 4378 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4379 const struct ethhdr *eth = (void *)skb->data; 4380 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4381 __be16 ethertype; 4382 4383 switch (sdata->vif.type) { 4384 case NL80211_IFTYPE_AP_VLAN: 4385 if (sdata->u.vlan.sta) 4386 return false; 4387 if (sdata->wdev.use_4addr) 4388 return false; 4389 fallthrough; 4390 case NL80211_IFTYPE_AP: 4391 /* check runtime toggle for this bss */ 4392 if (!sdata->bss->multicast_to_unicast) 4393 return false; 4394 break; 4395 default: 4396 return false; 4397 } 4398 4399 /* multicast to unicast conversion only for some payload */ 4400 ethertype = eth->h_proto; 4401 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4402 ethertype = ethvlan->h_vlan_encapsulated_proto; 4403 switch (ethertype) { 4404 case htons(ETH_P_ARP): 4405 case htons(ETH_P_IP): 4406 case htons(ETH_P_IPV6): 4407 break; 4408 default: 4409 return false; 4410 } 4411 4412 return true; 4413 } 4414 4415 static void 4416 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4417 struct sk_buff_head *queue) 4418 { 4419 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4420 struct ieee80211_local *local = sdata->local; 4421 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4422 struct sta_info *sta, *first = NULL; 4423 struct sk_buff *cloned_skb; 4424 4425 rcu_read_lock(); 4426 4427 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4428 if (sdata != sta->sdata) 4429 /* AP-VLAN mismatch */ 4430 continue; 4431 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4432 /* do not send back to source */ 4433 continue; 4434 if (!first) { 4435 first = sta; 4436 continue; 4437 } 4438 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4439 if (!cloned_skb) 4440 goto multicast; 4441 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4442 dev_kfree_skb(cloned_skb); 4443 goto multicast; 4444 } 4445 __skb_queue_tail(queue, cloned_skb); 4446 } 4447 4448 if (likely(first)) { 4449 if (unlikely(ieee80211_change_da(skb, first))) 4450 goto multicast; 4451 __skb_queue_tail(queue, skb); 4452 } else { 4453 /* no STA connected, drop */ 4454 kfree_skb(skb); 4455 skb = NULL; 4456 } 4457 4458 goto out; 4459 multicast: 4460 __skb_queue_purge(queue); 4461 __skb_queue_tail(queue, skb); 4462 out: 4463 rcu_read_unlock(); 4464 } 4465 4466 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4467 struct sk_buff *skb, u32 ctrl_flags, 4468 unsigned int link_id) 4469 { 4470 struct sk_buff *out; 4471 4472 out = skb_copy(skb, GFP_ATOMIC); 4473 if (!out) 4474 return; 4475 4476 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4477 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4478 } 4479 4480 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4481 struct sk_buff *skb) 4482 { 4483 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4484 unsigned long links = sdata->vif.active_links; 4485 unsigned int link; 4486 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4487 4488 if (hweight16(links) == 1) { 4489 ctrl_flags |= u32_encode_bits(__ffs(links), 4490 IEEE80211_TX_CTRL_MLO_LINK); 4491 4492 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4493 NULL); 4494 return; 4495 } 4496 4497 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4498 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4499 ctrl_flags = 0; 4500 } 4501 kfree_skb(skb); 4502 } 4503 4504 /** 4505 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4506 * @skb: packet to be sent 4507 * @dev: incoming interface 4508 * 4509 * On failure skb will be freed. 4510 * 4511 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4512 */ 4513 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4514 struct net_device *dev) 4515 { 4516 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4517 const struct ethhdr *eth = (void *)skb->data; 4518 4519 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4520 goto normal; 4521 4522 if (unlikely(!ieee80211_sdata_running(sdata))) { 4523 kfree_skb(skb); 4524 return NETDEV_TX_OK; 4525 } 4526 4527 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4528 struct sk_buff_head queue; 4529 4530 __skb_queue_head_init(&queue); 4531 ieee80211_convert_to_unicast(skb, dev, &queue); 4532 while ((skb = __skb_dequeue(&queue))) 4533 __ieee80211_subif_start_xmit(skb, dev, 0, 4534 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4535 NULL); 4536 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4537 ((sdata->vif.type == NL80211_IFTYPE_AP && 4538 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4539 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4540 !sdata->wdev.use_4addr))) { 4541 ieee80211_mlo_multicast_tx(dev, skb); 4542 } else { 4543 normal: 4544 __ieee80211_subif_start_xmit(skb, dev, 0, 4545 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4546 NULL); 4547 } 4548 4549 return NETDEV_TX_OK; 4550 } 4551 4552 4553 4554 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4555 struct sk_buff *skb, struct sta_info *sta, 4556 bool txpending) 4557 { 4558 struct ieee80211_local *local = sdata->local; 4559 struct ieee80211_tx_control control = {}; 4560 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4561 struct ieee80211_sta *pubsta = NULL; 4562 unsigned long flags; 4563 int q = info->hw_queue; 4564 4565 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4566 4567 if (local->queue_stop_reasons[q] || 4568 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4569 if (txpending) 4570 skb_queue_head(&local->pending[q], skb); 4571 else 4572 skb_queue_tail(&local->pending[q], skb); 4573 4574 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4575 4576 return false; 4577 } 4578 4579 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4580 4581 if (sta && sta->uploaded) 4582 pubsta = &sta->sta; 4583 4584 control.sta = pubsta; 4585 4586 drv_tx(local, &control, skb); 4587 4588 return true; 4589 } 4590 4591 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4592 struct sk_buff *skb, struct sta_info *sta, 4593 bool txpending) 4594 { 4595 struct ieee80211_local *local = sdata->local; 4596 struct sk_buff *next; 4597 bool ret = true; 4598 4599 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4600 return true; 4601 4602 skb_list_walk_safe(skb, skb, next) { 4603 skb_mark_not_on_list(skb); 4604 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4605 ret = false; 4606 } 4607 4608 return ret; 4609 } 4610 4611 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4612 struct net_device *dev, struct sta_info *sta, 4613 struct ieee80211_key *key, struct sk_buff *skb) 4614 { 4615 struct ieee80211_tx_info *info; 4616 struct ieee80211_local *local = sdata->local; 4617 struct tid_ampdu_tx *tid_tx; 4618 struct sk_buff *seg, *next; 4619 unsigned int skbs = 0, len = 0; 4620 u16 queue; 4621 u8 tid; 4622 4623 queue = ieee80211_select_queue(sdata, sta, skb); 4624 skb_set_queue_mapping(skb, queue); 4625 4626 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4627 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4628 goto out_free; 4629 4630 skb = skb_share_check(skb, GFP_ATOMIC); 4631 if (unlikely(!skb)) 4632 return; 4633 4634 ieee80211_aggr_check(sdata, sta, skb); 4635 4636 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4637 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4638 if (tid_tx) { 4639 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4640 /* fall back to non-offload slow path */ 4641 __ieee80211_subif_start_xmit(skb, dev, 0, 4642 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4643 NULL); 4644 return; 4645 } 4646 4647 if (tid_tx->timeout) 4648 tid_tx->last_tx = jiffies; 4649 } 4650 4651 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4652 if (!skb) 4653 return; 4654 4655 info = IEEE80211_SKB_CB(skb); 4656 memset(info, 0, sizeof(*info)); 4657 4658 info->hw_queue = sdata->vif.hw_queue[queue]; 4659 4660 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4661 sdata = container_of(sdata->bss, 4662 struct ieee80211_sub_if_data, u.ap); 4663 4664 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4665 info->control.vif = &sdata->vif; 4666 4667 if (key) 4668 info->control.hw_key = &key->conf; 4669 4670 skb_list_walk_safe(skb, seg, next) { 4671 skbs++; 4672 len += seg->len; 4673 if (seg != skb) 4674 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4675 } 4676 4677 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4678 info->status_data = ieee80211_store_ack_skb(local, skb, 4679 &info->flags, NULL); 4680 if (info->status_data) 4681 info->status_data_idr = 1; 4682 } 4683 4684 dev_sw_netstats_tx_add(dev, skbs, len); 4685 sta->deflink.tx_stats.packets[queue] += skbs; 4686 sta->deflink.tx_stats.bytes[queue] += len; 4687 4688 ieee80211_tpt_led_trig_tx(local, len); 4689 4690 ieee80211_tx_8023(sdata, skb, sta, false); 4691 4692 return; 4693 4694 out_free: 4695 kfree_skb(skb); 4696 } 4697 4698 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4699 struct net_device *dev) 4700 { 4701 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4702 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4703 struct ieee80211_key *key; 4704 struct sta_info *sta; 4705 4706 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4707 kfree_skb(skb); 4708 return NETDEV_TX_OK; 4709 } 4710 4711 rcu_read_lock(); 4712 4713 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4714 kfree_skb(skb); 4715 goto out; 4716 } 4717 4718 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4719 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4720 sdata->control_port_protocol == ehdr->h_proto)) 4721 goto skip_offload; 4722 4723 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4724 if (!key) 4725 key = rcu_dereference(sdata->default_unicast_key); 4726 4727 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4728 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4729 goto skip_offload; 4730 4731 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4732 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4733 goto out; 4734 4735 skip_offload: 4736 ieee80211_subif_start_xmit(skb, dev); 4737 out: 4738 rcu_read_unlock(); 4739 4740 return NETDEV_TX_OK; 4741 } 4742 4743 struct sk_buff * 4744 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4745 struct sk_buff *skb, u32 info_flags) 4746 { 4747 struct ieee80211_hdr *hdr; 4748 struct ieee80211_tx_data tx = { 4749 .local = sdata->local, 4750 .sdata = sdata, 4751 }; 4752 struct sta_info *sta; 4753 4754 rcu_read_lock(); 4755 4756 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4757 kfree_skb(skb); 4758 skb = ERR_PTR(-EINVAL); 4759 goto out; 4760 } 4761 4762 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4763 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4764 if (IS_ERR(skb)) 4765 goto out; 4766 4767 hdr = (void *)skb->data; 4768 tx.sta = sta_info_get(sdata, hdr->addr1); 4769 tx.skb = skb; 4770 4771 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4772 rcu_read_unlock(); 4773 kfree_skb(skb); 4774 return ERR_PTR(-EINVAL); 4775 } 4776 4777 out: 4778 rcu_read_unlock(); 4779 return skb; 4780 } 4781 4782 /* 4783 * ieee80211_clear_tx_pending may not be called in a context where 4784 * it is possible that it packets could come in again. 4785 */ 4786 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4787 { 4788 struct sk_buff *skb; 4789 int i; 4790 4791 for (i = 0; i < local->hw.queues; i++) { 4792 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4793 ieee80211_free_txskb(&local->hw, skb); 4794 } 4795 } 4796 4797 /* 4798 * Returns false if the frame couldn't be transmitted but was queued instead, 4799 * which in this case means re-queued -- take as an indication to stop sending 4800 * more pending frames. 4801 */ 4802 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4803 struct sk_buff *skb) 4804 { 4805 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4806 struct ieee80211_sub_if_data *sdata; 4807 struct sta_info *sta; 4808 struct ieee80211_hdr *hdr; 4809 bool result; 4810 struct ieee80211_chanctx_conf *chanctx_conf; 4811 4812 sdata = vif_to_sdata(info->control.vif); 4813 4814 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4815 /* update band only for non-MLD */ 4816 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4817 chanctx_conf = 4818 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4819 if (unlikely(!chanctx_conf)) { 4820 dev_kfree_skb(skb); 4821 return true; 4822 } 4823 info->band = chanctx_conf->def.chan->band; 4824 } 4825 result = ieee80211_tx(sdata, NULL, skb, true); 4826 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4827 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4828 dev_kfree_skb(skb); 4829 return true; 4830 } 4831 4832 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4833 sta = NULL; 4834 4835 result = ieee80211_tx_8023(sdata, skb, sta, true); 4836 } else { 4837 struct sk_buff_head skbs; 4838 4839 __skb_queue_head_init(&skbs); 4840 __skb_queue_tail(&skbs, skb); 4841 4842 hdr = (struct ieee80211_hdr *)skb->data; 4843 sta = sta_info_get(sdata, hdr->addr1); 4844 4845 result = __ieee80211_tx(local, &skbs, sta, true); 4846 } 4847 4848 return result; 4849 } 4850 4851 /* 4852 * Transmit all pending packets. Called from tasklet. 4853 */ 4854 void ieee80211_tx_pending(struct tasklet_struct *t) 4855 { 4856 struct ieee80211_local *local = from_tasklet(local, t, 4857 tx_pending_tasklet); 4858 unsigned long flags; 4859 int i; 4860 bool txok; 4861 4862 rcu_read_lock(); 4863 4864 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4865 for (i = 0; i < local->hw.queues; i++) { 4866 /* 4867 * If queue is stopped by something other than due to pending 4868 * frames, or we have no pending frames, proceed to next queue. 4869 */ 4870 if (local->queue_stop_reasons[i] || 4871 skb_queue_empty(&local->pending[i])) 4872 continue; 4873 4874 while (!skb_queue_empty(&local->pending[i])) { 4875 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4876 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4877 4878 if (WARN_ON(!info->control.vif)) { 4879 ieee80211_free_txskb(&local->hw, skb); 4880 continue; 4881 } 4882 4883 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4884 flags); 4885 4886 txok = ieee80211_tx_pending_skb(local, skb); 4887 spin_lock_irqsave(&local->queue_stop_reason_lock, 4888 flags); 4889 if (!txok) 4890 break; 4891 } 4892 } 4893 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4894 4895 rcu_read_unlock(); 4896 } 4897 4898 /* functions for drivers to get certain frames */ 4899 4900 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 4901 struct sk_buff *skb, 4902 bool mcast_traffic) 4903 { 4904 int i, n1 = 0, n2; 4905 4906 /* 4907 * Find largest even number N1 so that bits numbered 1 through 4908 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4909 * (N2 + 1) x 8 through 2007 are 0. 4910 */ 4911 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4912 if (ps->tim[i]) { 4913 n1 = i & 0xfe; 4914 break; 4915 } 4916 } 4917 n2 = n1; 4918 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4919 if (ps->tim[i]) { 4920 n2 = i; 4921 break; 4922 } 4923 } 4924 4925 /* Bitmap control */ 4926 skb_put_u8(skb, n1 | mcast_traffic); 4927 /* Part Virt Bitmap */ 4928 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4929 } 4930 4931 /* 4932 * mac80211 currently supports encoding using block bitmap mode, non 4933 * inversed. The current implementation supports up to 1600 AIDs. 4934 * 4935 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 4936 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 4937 * describes 8 AIDs and the presence of a subblock is determined by 4938 * the block bitmap. 4939 */ 4940 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 4941 struct sk_buff *skb, 4942 bool mcast_traffic) 4943 { 4944 int blk; 4945 4946 /* 4947 * Emit a bitmap control block with a page slice number of 31 and a 4948 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 4949 * that the entire page (2048 bits) indicated by the page index 4950 * is encoded in the partial virtual bitmap. 4951 */ 4952 skb_put_u8(skb, mcast_traffic | (31 << 1)); 4953 4954 /* Emit an encoded block for each non-zero sub-block */ 4955 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 4956 u8 blk_bmap = 0; 4957 int sblk; 4958 4959 for (sblk = 0; sblk < 8; sblk++) { 4960 int sblk_idx = blk * 8 + sblk; 4961 4962 /* 4963 * If the current subblock is non-zero, increase the 4964 * number of subblocks to emit for the current block. 4965 */ 4966 if (ps->tim[sblk_idx]) 4967 blk_bmap |= BIT(sblk); 4968 } 4969 4970 /* If the current block contains no non-zero sublocks */ 4971 if (!blk_bmap) 4972 continue; 4973 4974 /* 4975 * Emit a block control byte for the current encoded block 4976 * with an encoding mode of block bitmap (0x0), not inverse 4977 * (0x0) and the current block offset (5 bits) 4978 */ 4979 skb_put_u8(skb, blk << 3); 4980 4981 /* 4982 * Emit the block bitmap for the current encoded block which 4983 * contains the present subblocks. 4984 */ 4985 skb_put_u8(skb, blk_bmap); 4986 4987 /* Emit the present subblocks */ 4988 for (sblk = 0; sblk < 8; sblk++) { 4989 int sblk_idx = blk * 8 + sblk; 4990 4991 if (!(blk_bmap & BIT(sblk))) 4992 continue; 4993 4994 skb_put_u8(skb, ps->tim[sblk_idx]); 4995 } 4996 } 4997 } 4998 4999 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5000 struct ieee80211_link_data *link, 5001 struct ps_data *ps, struct sk_buff *skb, 5002 bool is_template) 5003 { 5004 struct element *tim; 5005 bool mcast_traffic = false, have_bits = false; 5006 struct ieee80211_bss_conf *link_conf = link->conf; 5007 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5008 5009 /* Generate bitmap for TIM only if there are any STAs in power save 5010 * mode. */ 5011 if (atomic_read(&ps->num_sta_ps) > 0) 5012 /* in the hope that this is faster than 5013 * checking byte-for-byte */ 5014 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5015 IEEE80211_MAX_AID + 1); 5016 5017 if (!is_template) { 5018 if (ps->dtim_count == 0) 5019 ps->dtim_count = link_conf->dtim_period - 1; 5020 else 5021 ps->dtim_count--; 5022 } 5023 5024 /* Length is set after parsing the AID bitmap */ 5025 tim = skb_put(skb, sizeof(struct element)); 5026 tim->id = WLAN_EID_TIM; 5027 skb_put_u8(skb, ps->dtim_count); 5028 skb_put_u8(skb, link_conf->dtim_period); 5029 5030 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5031 mcast_traffic = true; 5032 5033 ps->dtim_bc_mc = mcast_traffic; 5034 5035 if (have_bits) { 5036 if (s1g) 5037 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, 5038 mcast_traffic); 5039 else 5040 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5041 } else { 5042 /* 5043 * If there is no buffered unicast traffic for an S1G 5044 * interface, we can exclude the bitmap control. This is in 5045 * contrast to other phy types as they do include the bitmap 5046 * control and pvb even when there is no buffered traffic. 5047 */ 5048 if (!s1g) { 5049 /* Bitmap control */ 5050 skb_put_u8(skb, mcast_traffic); 5051 /* Part Virt Bitmap */ 5052 skb_put_u8(skb, 0); 5053 } 5054 } 5055 5056 tim->datalen = skb_tail_pointer(skb) - tim->data; 5057 } 5058 5059 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5060 struct ieee80211_link_data *link, 5061 struct ps_data *ps, struct sk_buff *skb, 5062 bool is_template) 5063 { 5064 struct ieee80211_local *local = sdata->local; 5065 5066 /* 5067 * Not very nice, but we want to allow the driver to call 5068 * ieee80211_beacon_get() as a response to the set_tim() 5069 * callback. That, however, is already invoked under the 5070 * sta_lock to guarantee consistent and race-free update 5071 * of the tim bitmap in mac80211 and the driver. 5072 */ 5073 if (local->tim_in_locked_section) { 5074 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5075 } else { 5076 spin_lock_bh(&local->tim_lock); 5077 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5078 spin_unlock_bh(&local->tim_lock); 5079 } 5080 5081 return 0; 5082 } 5083 5084 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5085 struct beacon_data *beacon, 5086 struct ieee80211_link_data *link) 5087 { 5088 u8 *beacon_data, count, max_count = 1; 5089 struct probe_resp *resp; 5090 size_t beacon_data_len; 5091 u16 *bcn_offsets; 5092 int i; 5093 5094 switch (sdata->vif.type) { 5095 case NL80211_IFTYPE_AP: 5096 beacon_data = beacon->tail; 5097 beacon_data_len = beacon->tail_len; 5098 break; 5099 case NL80211_IFTYPE_ADHOC: 5100 beacon_data = beacon->head; 5101 beacon_data_len = beacon->head_len; 5102 break; 5103 case NL80211_IFTYPE_MESH_POINT: 5104 beacon_data = beacon->head; 5105 beacon_data_len = beacon->head_len; 5106 break; 5107 default: 5108 return; 5109 } 5110 5111 resp = rcu_dereference(link->u.ap.probe_resp); 5112 5113 bcn_offsets = beacon->cntdwn_counter_offsets; 5114 count = beacon->cntdwn_current_counter; 5115 if (link->conf->csa_active) 5116 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5117 5118 for (i = 0; i < max_count; ++i) { 5119 if (bcn_offsets[i]) { 5120 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5121 return; 5122 beacon_data[bcn_offsets[i]] = count; 5123 } 5124 5125 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5126 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5127 5128 resp->data[resp_offsets[i]] = count; 5129 } 5130 } 5131 } 5132 5133 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5134 struct beacon_data *beacon) 5135 { 5136 if (beacon->cntdwn_current_counter == 1) { 5137 /* 5138 * Channel switch handling is done by a worker thread while 5139 * beacons get pulled from hardware timers. It's therefore 5140 * possible that software threads are slow enough to not be 5141 * able to complete CSA handling in a single beacon interval, 5142 * in which case we get here. There isn't much to do about 5143 * it, other than letting the user know that the AP isn't 5144 * behaving correctly. 5145 */ 5146 link_err_once(link, 5147 "beacon TX faster than countdown (channel/color switch) completion\n"); 5148 return 0; 5149 } 5150 5151 beacon->cntdwn_current_counter--; 5152 5153 return beacon->cntdwn_current_counter; 5154 } 5155 5156 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5157 { 5158 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5159 struct ieee80211_link_data *link; 5160 struct beacon_data *beacon = NULL; 5161 u8 count = 0; 5162 5163 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5164 return 0; 5165 5166 rcu_read_lock(); 5167 5168 link = rcu_dereference(sdata->link[link_id]); 5169 if (!link) 5170 goto unlock; 5171 5172 if (sdata->vif.type == NL80211_IFTYPE_AP) 5173 beacon = rcu_dereference(link->u.ap.beacon); 5174 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5175 beacon = rcu_dereference(sdata->u.ibss.presp); 5176 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5177 beacon = rcu_dereference(sdata->u.mesh.beacon); 5178 5179 if (!beacon) 5180 goto unlock; 5181 5182 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5183 5184 unlock: 5185 rcu_read_unlock(); 5186 return count; 5187 } 5188 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5189 5190 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5191 { 5192 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5193 struct beacon_data *beacon = NULL; 5194 5195 rcu_read_lock(); 5196 5197 if (sdata->vif.type == NL80211_IFTYPE_AP) 5198 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5199 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5200 beacon = rcu_dereference(sdata->u.ibss.presp); 5201 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5202 beacon = rcu_dereference(sdata->u.mesh.beacon); 5203 5204 if (!beacon) 5205 goto unlock; 5206 5207 if (counter < beacon->cntdwn_current_counter) 5208 beacon->cntdwn_current_counter = counter; 5209 5210 unlock: 5211 rcu_read_unlock(); 5212 } 5213 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5214 5215 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5216 unsigned int link_id) 5217 { 5218 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5219 struct ieee80211_link_data *link; 5220 struct beacon_data *beacon = NULL; 5221 u8 *beacon_data; 5222 size_t beacon_data_len; 5223 int ret = false; 5224 5225 if (!ieee80211_sdata_running(sdata)) 5226 return false; 5227 5228 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5229 return 0; 5230 5231 rcu_read_lock(); 5232 5233 link = rcu_dereference(sdata->link[link_id]); 5234 if (!link) 5235 goto out; 5236 5237 if (vif->type == NL80211_IFTYPE_AP) { 5238 beacon = rcu_dereference(link->u.ap.beacon); 5239 if (WARN_ON(!beacon || !beacon->tail)) 5240 goto out; 5241 beacon_data = beacon->tail; 5242 beacon_data_len = beacon->tail_len; 5243 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5244 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5245 5246 beacon = rcu_dereference(ifibss->presp); 5247 if (!beacon) 5248 goto out; 5249 5250 beacon_data = beacon->head; 5251 beacon_data_len = beacon->head_len; 5252 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5253 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5254 5255 beacon = rcu_dereference(ifmsh->beacon); 5256 if (!beacon) 5257 goto out; 5258 5259 beacon_data = beacon->head; 5260 beacon_data_len = beacon->head_len; 5261 } else { 5262 WARN_ON(1); 5263 goto out; 5264 } 5265 5266 if (!beacon->cntdwn_counter_offsets[0]) 5267 goto out; 5268 5269 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5270 goto out; 5271 5272 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5273 ret = true; 5274 5275 out: 5276 rcu_read_unlock(); 5277 5278 return ret; 5279 } 5280 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5281 5282 static int ieee80211_beacon_protect(struct sk_buff *skb, 5283 struct ieee80211_local *local, 5284 struct ieee80211_sub_if_data *sdata, 5285 struct ieee80211_link_data *link) 5286 { 5287 ieee80211_tx_result res; 5288 struct ieee80211_tx_data tx; 5289 struct sk_buff *check_skb; 5290 5291 memset(&tx, 0, sizeof(tx)); 5292 tx.key = rcu_dereference(link->default_beacon_key); 5293 if (!tx.key) 5294 return 0; 5295 5296 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5297 tx.key = NULL; 5298 return -EINVAL; 5299 } 5300 5301 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5302 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5303 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5304 5305 tx.local = local; 5306 tx.sdata = sdata; 5307 __skb_queue_head_init(&tx.skbs); 5308 __skb_queue_tail(&tx.skbs, skb); 5309 res = ieee80211_tx_h_encrypt(&tx); 5310 check_skb = __skb_dequeue(&tx.skbs); 5311 /* we may crash after this, but it'd be a bug in crypto */ 5312 WARN_ON(check_skb != skb); 5313 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5314 return -EINVAL; 5315 5316 return 0; 5317 } 5318 5319 static void 5320 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5321 struct ieee80211_vif *vif, 5322 struct ieee80211_link_data *link, 5323 struct ieee80211_mutable_offsets *offs, 5324 struct beacon_data *beacon, 5325 struct sk_buff *skb, 5326 struct ieee80211_chanctx_conf *chanctx_conf, 5327 u16 csa_off_base) 5328 { 5329 struct ieee80211_local *local = hw_to_local(hw); 5330 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5331 struct ieee80211_tx_info *info; 5332 enum nl80211_band band; 5333 struct ieee80211_tx_rate_control txrc; 5334 5335 /* CSA offsets */ 5336 if (offs && beacon) { 5337 u16 i; 5338 5339 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5340 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5341 5342 if (!csa_off) 5343 continue; 5344 5345 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5346 } 5347 } 5348 5349 band = chanctx_conf->def.chan->band; 5350 info = IEEE80211_SKB_CB(skb); 5351 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5352 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5353 info->band = band; 5354 5355 memset(&txrc, 0, sizeof(txrc)); 5356 txrc.hw = hw; 5357 txrc.sband = local->hw.wiphy->bands[band]; 5358 txrc.bss_conf = link->conf; 5359 txrc.skb = skb; 5360 txrc.reported_rate.idx = -1; 5361 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5362 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5363 else 5364 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5365 txrc.bss = true; 5366 rate_control_get_rate(sdata, NULL, &txrc); 5367 5368 info->control.vif = vif; 5369 info->control.flags |= u32_encode_bits(link->link_id, 5370 IEEE80211_TX_CTRL_MLO_LINK); 5371 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5372 IEEE80211_TX_CTL_ASSIGN_SEQ | 5373 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5374 } 5375 5376 static void 5377 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5378 u8 i) 5379 { 5380 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5381 i > beacon->mbssid_ies->cnt) 5382 return; 5383 5384 if (i < beacon->mbssid_ies->cnt) { 5385 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5386 beacon->mbssid_ies->elem[i].len); 5387 5388 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5389 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5390 beacon->rnr_ies->elem[i].len); 5391 5392 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5393 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5394 beacon->rnr_ies->elem[i].len); 5395 } 5396 return; 5397 } 5398 5399 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5400 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5401 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5402 beacon->mbssid_ies->elem[i].len); 5403 } 5404 5405 static struct sk_buff * 5406 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5407 struct ieee80211_vif *vif, 5408 struct ieee80211_link_data *link, 5409 struct ieee80211_mutable_offsets *offs, 5410 bool is_template, 5411 struct beacon_data *beacon, 5412 struct ieee80211_chanctx_conf *chanctx_conf, 5413 u8 ema_index) 5414 { 5415 struct ieee80211_local *local = hw_to_local(hw); 5416 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5417 struct ieee80211_if_ap *ap = &sdata->u.ap; 5418 struct sk_buff *skb = NULL; 5419 u16 csa_off_base = 0; 5420 int mbssid_len; 5421 5422 if (beacon->cntdwn_counter_offsets[0]) { 5423 if (!is_template) 5424 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5425 5426 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5427 } 5428 5429 /* headroom, head length, 5430 * tail length, maximum TIM length and multiple BSSID length 5431 */ 5432 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5433 beacon->rnr_ies, 5434 ema_index); 5435 5436 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5437 beacon->tail_len + 256 + 5438 local->hw.extra_beacon_tailroom + mbssid_len); 5439 if (!skb) 5440 return NULL; 5441 5442 skb_reserve(skb, local->tx_headroom); 5443 skb_put_data(skb, beacon->head, beacon->head_len); 5444 5445 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5446 5447 if (offs) { 5448 offs->tim_offset = beacon->head_len; 5449 offs->tim_length = skb->len - beacon->head_len; 5450 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5451 5452 if (mbssid_len) { 5453 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5454 offs->mbssid_off = skb->len - mbssid_len; 5455 } 5456 5457 /* for AP the csa offsets are from tail */ 5458 csa_off_base = skb->len; 5459 } 5460 5461 if (beacon->tail) 5462 skb_put_data(skb, beacon->tail, beacon->tail_len); 5463 5464 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5465 dev_kfree_skb(skb); 5466 return NULL; 5467 } 5468 5469 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5470 chanctx_conf, csa_off_base); 5471 return skb; 5472 } 5473 5474 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5475 struct ieee80211_link_data *link) 5476 { 5477 struct ps_data *ps = &sdata->u.ap.ps; 5478 5479 if (ps->sb_count == 0) 5480 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5481 else 5482 ps->sb_count--; 5483 5484 return ps->sb_count == 0; 5485 } 5486 5487 static struct sk_buff * 5488 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5489 struct ieee80211_vif *vif, 5490 struct ieee80211_link_data *link, 5491 struct ieee80211_chanctx_conf *chanctx_conf, 5492 struct s1g_short_beacon_data *sb, 5493 bool is_template) 5494 { 5495 struct ieee80211_local *local = hw_to_local(hw); 5496 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5497 struct ieee80211_if_ap *ap = &sdata->u.ap; 5498 struct sk_buff *skb; 5499 5500 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5501 sb->short_tail_len + 256 + 5502 local->hw.extra_beacon_tailroom); 5503 if (!skb) 5504 return NULL; 5505 5506 skb_reserve(skb, local->tx_headroom); 5507 skb_put_data(skb, sb->short_head, sb->short_head_len); 5508 5509 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5510 5511 if (sb->short_tail) 5512 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5513 5514 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5515 chanctx_conf, 0); 5516 return skb; 5517 } 5518 5519 static struct sk_buff * 5520 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5521 struct ieee80211_link_data *link, 5522 struct ieee80211_mutable_offsets *offs, 5523 bool is_template, struct beacon_data *beacon, 5524 struct ieee80211_chanctx_conf *chanctx_conf, 5525 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5526 { 5527 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5528 5529 if (!sdata->vif.cfg.s1g || !s1g_sb || 5530 ieee80211_s1g_need_long_beacon(sdata, link)) 5531 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5532 is_template, beacon, 5533 chanctx_conf, ema_index); 5534 5535 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5536 s1g_sb, is_template); 5537 } 5538 5539 static struct ieee80211_ema_beacons * 5540 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5541 struct ieee80211_vif *vif, 5542 struct ieee80211_link_data *link, 5543 struct ieee80211_mutable_offsets *offs, 5544 bool is_template, struct beacon_data *beacon, 5545 struct ieee80211_chanctx_conf *chanctx_conf) 5546 { 5547 struct ieee80211_ema_beacons *ema = NULL; 5548 5549 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5550 return NULL; 5551 5552 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5553 GFP_ATOMIC); 5554 if (!ema) 5555 return NULL; 5556 5557 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5558 ema->bcn[ema->cnt].skb = 5559 ieee80211_beacon_get_ap(hw, vif, link, 5560 &ema->bcn[ema->cnt].offs, 5561 is_template, beacon, 5562 chanctx_conf, ema->cnt, NULL); 5563 if (!ema->bcn[ema->cnt].skb) 5564 break; 5565 } 5566 5567 if (ema->cnt == beacon->mbssid_ies->cnt) 5568 return ema; 5569 5570 ieee80211_beacon_free_ema_list(ema); 5571 return NULL; 5572 } 5573 5574 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5575 5576 static struct sk_buff * 5577 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5578 struct ieee80211_vif *vif, 5579 struct ieee80211_mutable_offsets *offs, 5580 bool is_template, 5581 unsigned int link_id, 5582 int ema_index, 5583 struct ieee80211_ema_beacons **ema_beacons) 5584 { 5585 struct ieee80211_local *local = hw_to_local(hw); 5586 struct beacon_data *beacon = NULL; 5587 struct sk_buff *skb = NULL; 5588 struct ieee80211_sub_if_data *sdata = NULL; 5589 struct ieee80211_chanctx_conf *chanctx_conf; 5590 struct ieee80211_link_data *link; 5591 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5592 5593 rcu_read_lock(); 5594 5595 sdata = vif_to_sdata(vif); 5596 link = rcu_dereference(sdata->link[link_id]); 5597 if (!link) 5598 goto out; 5599 chanctx_conf = 5600 rcu_dereference(link->conf->chanctx_conf); 5601 5602 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5603 goto out; 5604 5605 if (offs) 5606 memset(offs, 0, sizeof(*offs)); 5607 5608 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5609 beacon = rcu_dereference(link->u.ap.beacon); 5610 if (!beacon) 5611 goto out; 5612 5613 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5614 s1g_short_bcn = 5615 rcu_dereference(link->u.ap.s1g_short_beacon); 5616 if (!s1g_short_bcn) 5617 goto out; 5618 } 5619 5620 if (ema_beacons) { 5621 *ema_beacons = 5622 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5623 offs, 5624 is_template, 5625 beacon, 5626 chanctx_conf); 5627 } else { 5628 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5629 if (ema_index >= beacon->mbssid_ies->cnt) 5630 goto out; /* End of MBSSID elements */ 5631 5632 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5633 ema_index = beacon->mbssid_ies->cnt; 5634 } else { 5635 ema_index = 0; 5636 } 5637 5638 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5639 is_template, beacon, 5640 chanctx_conf, ema_index, 5641 s1g_short_bcn); 5642 } 5643 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5644 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5645 struct ieee80211_hdr *hdr; 5646 5647 beacon = rcu_dereference(ifibss->presp); 5648 if (!beacon) 5649 goto out; 5650 5651 if (beacon->cntdwn_counter_offsets[0]) { 5652 if (!is_template) 5653 __ieee80211_beacon_update_cntdwn(link, beacon); 5654 5655 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5656 } 5657 5658 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5659 local->hw.extra_beacon_tailroom); 5660 if (!skb) 5661 goto out; 5662 skb_reserve(skb, local->tx_headroom); 5663 skb_put_data(skb, beacon->head, beacon->head_len); 5664 5665 hdr = (struct ieee80211_hdr *) skb->data; 5666 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5667 IEEE80211_STYPE_BEACON); 5668 5669 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5670 chanctx_conf, 0); 5671 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5672 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5673 5674 beacon = rcu_dereference(ifmsh->beacon); 5675 if (!beacon) 5676 goto out; 5677 5678 if (beacon->cntdwn_counter_offsets[0]) { 5679 if (!is_template) 5680 /* TODO: For mesh csa_counter is in TU, so 5681 * decrementing it by one isn't correct, but 5682 * for now we leave it consistent with overall 5683 * mac80211's behavior. 5684 */ 5685 __ieee80211_beacon_update_cntdwn(link, beacon); 5686 5687 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5688 } 5689 5690 if (ifmsh->sync_ops) 5691 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5692 5693 skb = dev_alloc_skb(local->tx_headroom + 5694 beacon->head_len + 5695 256 + /* TIM IE */ 5696 beacon->tail_len + 5697 local->hw.extra_beacon_tailroom); 5698 if (!skb) 5699 goto out; 5700 skb_reserve(skb, local->tx_headroom); 5701 skb_put_data(skb, beacon->head, beacon->head_len); 5702 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5703 is_template); 5704 5705 if (offs) { 5706 offs->tim_offset = beacon->head_len; 5707 offs->tim_length = skb->len - beacon->head_len; 5708 } 5709 5710 skb_put_data(skb, beacon->tail, beacon->tail_len); 5711 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5712 chanctx_conf, 0); 5713 } else { 5714 WARN_ON(1); 5715 goto out; 5716 } 5717 5718 out: 5719 rcu_read_unlock(); 5720 return skb; 5721 5722 } 5723 5724 struct sk_buff * 5725 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5726 struct ieee80211_vif *vif, 5727 struct ieee80211_mutable_offsets *offs, 5728 unsigned int link_id) 5729 { 5730 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5731 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5732 } 5733 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5734 5735 struct sk_buff * 5736 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5737 struct ieee80211_vif *vif, 5738 struct ieee80211_mutable_offsets *offs, 5739 unsigned int link_id, u8 ema_index) 5740 { 5741 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5742 NULL); 5743 } 5744 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5745 5746 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5747 { 5748 u8 i; 5749 5750 if (!ema_beacons) 5751 return; 5752 5753 for (i = 0; i < ema_beacons->cnt; i++) 5754 kfree_skb(ema_beacons->bcn[i].skb); 5755 5756 kfree(ema_beacons); 5757 } 5758 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5759 5760 struct ieee80211_ema_beacons * 5761 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5762 struct ieee80211_vif *vif, 5763 unsigned int link_id) 5764 { 5765 struct ieee80211_ema_beacons *ema_beacons = NULL; 5766 5767 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5768 &ema_beacons)); 5769 5770 return ema_beacons; 5771 } 5772 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5773 5774 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5775 struct ieee80211_vif *vif, 5776 u16 *tim_offset, u16 *tim_length, 5777 unsigned int link_id) 5778 { 5779 struct ieee80211_mutable_offsets offs = {}; 5780 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5781 link_id, 5782 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5783 NULL); 5784 struct sk_buff *copy; 5785 5786 if (!bcn) 5787 return bcn; 5788 5789 if (tim_offset) 5790 *tim_offset = offs.tim_offset; 5791 5792 if (tim_length) 5793 *tim_length = offs.tim_length; 5794 5795 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5796 !hw_to_local(hw)->monitors) 5797 return bcn; 5798 5799 /* send a copy to monitor interfaces */ 5800 copy = skb_copy(bcn, GFP_ATOMIC); 5801 if (!copy) 5802 return bcn; 5803 5804 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 5805 5806 return bcn; 5807 } 5808 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5809 5810 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5811 struct ieee80211_vif *vif) 5812 { 5813 struct sk_buff *skb = NULL; 5814 struct probe_resp *presp = NULL; 5815 struct ieee80211_hdr *hdr; 5816 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5817 5818 if (sdata->vif.type != NL80211_IFTYPE_AP) 5819 return NULL; 5820 5821 rcu_read_lock(); 5822 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5823 if (!presp) 5824 goto out; 5825 5826 skb = dev_alloc_skb(presp->len); 5827 if (!skb) 5828 goto out; 5829 5830 skb_put_data(skb, presp->data, presp->len); 5831 5832 hdr = (struct ieee80211_hdr *) skb->data; 5833 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5834 5835 out: 5836 rcu_read_unlock(); 5837 return skb; 5838 } 5839 EXPORT_SYMBOL(ieee80211_proberesp_get); 5840 5841 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5842 struct ieee80211_vif *vif) 5843 { 5844 struct sk_buff *skb = NULL; 5845 struct fils_discovery_data *tmpl = NULL; 5846 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5847 5848 if (sdata->vif.type != NL80211_IFTYPE_AP) 5849 return NULL; 5850 5851 rcu_read_lock(); 5852 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5853 if (!tmpl) { 5854 rcu_read_unlock(); 5855 return NULL; 5856 } 5857 5858 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5859 if (skb) { 5860 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5861 skb_put_data(skb, tmpl->data, tmpl->len); 5862 } 5863 5864 rcu_read_unlock(); 5865 return skb; 5866 } 5867 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5868 5869 struct sk_buff * 5870 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5871 struct ieee80211_vif *vif) 5872 { 5873 struct sk_buff *skb = NULL; 5874 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5875 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5876 5877 if (sdata->vif.type != NL80211_IFTYPE_AP) 5878 return NULL; 5879 5880 rcu_read_lock(); 5881 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5882 if (!tmpl) { 5883 rcu_read_unlock(); 5884 return NULL; 5885 } 5886 5887 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5888 if (skb) { 5889 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5890 skb_put_data(skb, tmpl->data, tmpl->len); 5891 } 5892 5893 rcu_read_unlock(); 5894 return skb; 5895 } 5896 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5897 5898 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5899 struct ieee80211_vif *vif) 5900 { 5901 struct ieee80211_sub_if_data *sdata; 5902 struct ieee80211_pspoll *pspoll; 5903 struct ieee80211_local *local; 5904 struct sk_buff *skb; 5905 5906 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5907 return NULL; 5908 5909 sdata = vif_to_sdata(vif); 5910 local = sdata->local; 5911 5912 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5913 if (!skb) 5914 return NULL; 5915 5916 skb_reserve(skb, local->hw.extra_tx_headroom); 5917 5918 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5919 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5920 IEEE80211_STYPE_PSPOLL); 5921 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5922 5923 /* aid in PS-Poll has its two MSBs each set to 1 */ 5924 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5925 5926 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5927 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5928 5929 return skb; 5930 } 5931 EXPORT_SYMBOL(ieee80211_pspoll_get); 5932 5933 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5934 struct ieee80211_vif *vif, 5935 int link_id, bool qos_ok) 5936 { 5937 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5938 struct ieee80211_local *local = sdata->local; 5939 struct ieee80211_link_data *link = NULL; 5940 struct ieee80211_hdr_3addr *nullfunc; 5941 struct sk_buff *skb; 5942 bool qos = false; 5943 5944 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5945 return NULL; 5946 5947 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5948 sizeof(*nullfunc) + 2); 5949 if (!skb) 5950 return NULL; 5951 5952 rcu_read_lock(); 5953 if (qos_ok) { 5954 struct sta_info *sta; 5955 5956 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5957 qos = sta && sta->sta.wme; 5958 } 5959 5960 if (link_id >= 0) { 5961 link = rcu_dereference(sdata->link[link_id]); 5962 if (WARN_ON_ONCE(!link)) { 5963 rcu_read_unlock(); 5964 kfree_skb(skb); 5965 return NULL; 5966 } 5967 } 5968 5969 skb_reserve(skb, local->hw.extra_tx_headroom); 5970 5971 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5972 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5973 IEEE80211_STYPE_NULLFUNC | 5974 IEEE80211_FCTL_TODS); 5975 if (qos) { 5976 __le16 qoshdr = cpu_to_le16(7); 5977 5978 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5979 IEEE80211_STYPE_NULLFUNC) != 5980 IEEE80211_STYPE_QOS_NULLFUNC); 5981 nullfunc->frame_control |= 5982 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5983 skb->priority = 7; 5984 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5985 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5986 } 5987 5988 if (link) { 5989 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5990 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5991 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5992 } else { 5993 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5994 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5995 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5996 } 5997 rcu_read_unlock(); 5998 5999 return skb; 6000 } 6001 EXPORT_SYMBOL(ieee80211_nullfunc_get); 6002 6003 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 6004 const u8 *src_addr, 6005 const u8 *ssid, size_t ssid_len, 6006 size_t tailroom) 6007 { 6008 struct ieee80211_local *local = hw_to_local(hw); 6009 struct ieee80211_hdr_3addr *hdr; 6010 struct sk_buff *skb; 6011 size_t ie_ssid_len; 6012 u8 *pos; 6013 6014 ie_ssid_len = 2 + ssid_len; 6015 6016 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6017 ie_ssid_len + tailroom); 6018 if (!skb) 6019 return NULL; 6020 6021 skb_reserve(skb, local->hw.extra_tx_headroom); 6022 6023 hdr = skb_put_zero(skb, sizeof(*hdr)); 6024 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6025 IEEE80211_STYPE_PROBE_REQ); 6026 eth_broadcast_addr(hdr->addr1); 6027 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6028 eth_broadcast_addr(hdr->addr3); 6029 6030 pos = skb_put(skb, ie_ssid_len); 6031 *pos++ = WLAN_EID_SSID; 6032 *pos++ = ssid_len; 6033 if (ssid_len) 6034 memcpy(pos, ssid, ssid_len); 6035 pos += ssid_len; 6036 6037 return skb; 6038 } 6039 EXPORT_SYMBOL(ieee80211_probereq_get); 6040 6041 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6042 const void *frame, size_t frame_len, 6043 const struct ieee80211_tx_info *frame_txctl, 6044 struct ieee80211_rts *rts) 6045 { 6046 const struct ieee80211_hdr *hdr = frame; 6047 6048 rts->frame_control = 6049 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6050 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6051 frame_txctl); 6052 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6053 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6054 } 6055 EXPORT_SYMBOL(ieee80211_rts_get); 6056 6057 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6058 const void *frame, size_t frame_len, 6059 const struct ieee80211_tx_info *frame_txctl, 6060 struct ieee80211_cts *cts) 6061 { 6062 const struct ieee80211_hdr *hdr = frame; 6063 6064 cts->frame_control = 6065 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6066 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6067 frame_len, frame_txctl); 6068 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6069 } 6070 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6071 6072 struct sk_buff * 6073 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6074 struct ieee80211_vif *vif) 6075 { 6076 struct ieee80211_local *local = hw_to_local(hw); 6077 struct sk_buff *skb = NULL; 6078 struct ieee80211_tx_data tx; 6079 struct ieee80211_sub_if_data *sdata; 6080 struct ps_data *ps; 6081 struct ieee80211_tx_info *info; 6082 struct ieee80211_chanctx_conf *chanctx_conf; 6083 6084 sdata = vif_to_sdata(vif); 6085 6086 rcu_read_lock(); 6087 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6088 6089 if (!chanctx_conf) 6090 goto out; 6091 6092 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6093 struct beacon_data *beacon = 6094 rcu_dereference(sdata->deflink.u.ap.beacon); 6095 6096 if (!beacon || !beacon->head) 6097 goto out; 6098 6099 ps = &sdata->u.ap.ps; 6100 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6101 ps = &sdata->u.mesh.ps; 6102 } else { 6103 goto out; 6104 } 6105 6106 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6107 goto out; /* send buffered bc/mc only after DTIM beacon */ 6108 6109 while (1) { 6110 skb = skb_dequeue(&ps->bc_buf); 6111 if (!skb) 6112 goto out; 6113 local->total_ps_buffered--; 6114 6115 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6116 struct ieee80211_hdr *hdr = 6117 (struct ieee80211_hdr *) skb->data; 6118 /* more buffered multicast/broadcast frames ==> set 6119 * MoreData flag in IEEE 802.11 header to inform PS 6120 * STAs */ 6121 hdr->frame_control |= 6122 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6123 } 6124 6125 if (sdata->vif.type == NL80211_IFTYPE_AP) 6126 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6127 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6128 break; 6129 ieee80211_free_txskb(hw, skb); 6130 } 6131 6132 info = IEEE80211_SKB_CB(skb); 6133 6134 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6135 info->band = chanctx_conf->def.chan->band; 6136 6137 if (invoke_tx_handlers(&tx)) 6138 skb = NULL; 6139 out: 6140 rcu_read_unlock(); 6141 6142 return skb; 6143 } 6144 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6145 6146 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6147 { 6148 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6149 struct ieee80211_sub_if_data *sdata = sta->sdata; 6150 struct ieee80211_local *local = sdata->local; 6151 int ret; 6152 u32 queues; 6153 6154 lockdep_assert_wiphy(local->hw.wiphy); 6155 6156 /* only some cases are supported right now */ 6157 switch (sdata->vif.type) { 6158 case NL80211_IFTYPE_STATION: 6159 case NL80211_IFTYPE_AP: 6160 case NL80211_IFTYPE_AP_VLAN: 6161 break; 6162 default: 6163 WARN_ON(1); 6164 return -EINVAL; 6165 } 6166 6167 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6168 return -EINVAL; 6169 6170 if (sta->reserved_tid == tid) { 6171 ret = 0; 6172 goto out; 6173 } 6174 6175 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6176 sdata_err(sdata, "TID reservation already active\n"); 6177 ret = -EALREADY; 6178 goto out; 6179 } 6180 6181 ieee80211_stop_vif_queues(sdata->local, sdata, 6182 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6183 6184 synchronize_net(); 6185 6186 /* Tear down BA sessions so we stop aggregating on this TID */ 6187 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6188 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6189 __ieee80211_stop_tx_ba_session(sta, tid, 6190 AGG_STOP_LOCAL_REQUEST); 6191 } 6192 6193 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6194 __ieee80211_flush_queues(local, sdata, queues, false); 6195 6196 sta->reserved_tid = tid; 6197 6198 ieee80211_wake_vif_queues(local, sdata, 6199 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6200 6201 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6202 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6203 6204 ret = 0; 6205 out: 6206 return ret; 6207 } 6208 EXPORT_SYMBOL(ieee80211_reserve_tid); 6209 6210 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6211 { 6212 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6213 struct ieee80211_sub_if_data *sdata = sta->sdata; 6214 6215 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6216 6217 /* only some cases are supported right now */ 6218 switch (sdata->vif.type) { 6219 case NL80211_IFTYPE_STATION: 6220 case NL80211_IFTYPE_AP: 6221 case NL80211_IFTYPE_AP_VLAN: 6222 break; 6223 default: 6224 WARN_ON(1); 6225 return; 6226 } 6227 6228 if (tid != sta->reserved_tid) { 6229 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6230 return; 6231 } 6232 6233 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6234 } 6235 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6236 6237 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6238 struct sk_buff *skb, int tid, int link_id, 6239 enum nl80211_band band) 6240 { 6241 const struct ieee80211_hdr *hdr = (void *)skb->data; 6242 int ac = ieee80211_ac_from_tid(tid); 6243 unsigned int link; 6244 6245 skb_reset_mac_header(skb); 6246 skb_set_queue_mapping(skb, ac); 6247 skb->priority = tid; 6248 6249 skb->dev = sdata->dev; 6250 6251 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6252 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6253 IEEE80211_LINK_UNSPECIFIED)); 6254 6255 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6256 link = 0; 6257 } else if (link_id >= 0) { 6258 link = link_id; 6259 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6260 /* address from the MLD */ 6261 link = IEEE80211_LINK_UNSPECIFIED; 6262 } else { 6263 /* otherwise must be addressed from a link */ 6264 rcu_read_lock(); 6265 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6266 struct ieee80211_bss_conf *link_conf; 6267 6268 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6269 if (!link_conf) 6270 continue; 6271 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6272 break; 6273 } 6274 rcu_read_unlock(); 6275 6276 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6277 link = ffs(sdata->vif.active_links) - 1; 6278 } 6279 6280 IEEE80211_SKB_CB(skb)->control.flags |= 6281 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6282 6283 /* 6284 * The other path calling ieee80211_xmit is from the tasklet, 6285 * and while we can handle concurrent transmissions locking 6286 * requirements are that we do not come into tx with bhs on. 6287 */ 6288 local_bh_disable(); 6289 IEEE80211_SKB_CB(skb)->band = band; 6290 ieee80211_xmit(sdata, NULL, skb); 6291 local_bh_enable(); 6292 } 6293 6294 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6295 struct sk_buff *skb, int tid, int link_id) 6296 { 6297 struct ieee80211_chanctx_conf *chanctx_conf; 6298 enum nl80211_band band; 6299 6300 rcu_read_lock(); 6301 if (sdata->vif.type == NL80211_IFTYPE_NAN) { 6302 band = NUM_NL80211_BANDS; 6303 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6304 WARN_ON(link_id >= 0); 6305 chanctx_conf = 6306 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6307 if (WARN_ON(!chanctx_conf)) { 6308 rcu_read_unlock(); 6309 kfree_skb(skb); 6310 return; 6311 } 6312 band = chanctx_conf->def.chan->band; 6313 } else { 6314 WARN_ON(link_id >= 0 && 6315 !(sdata->vif.active_links & BIT(link_id))); 6316 /* MLD transmissions must not rely on the band */ 6317 band = 0; 6318 } 6319 6320 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6321 rcu_read_unlock(); 6322 } 6323 6324 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6325 const u8 *buf, size_t len, 6326 const u8 *dest, __be16 proto, bool unencrypted, 6327 int link_id, u64 *cookie) 6328 { 6329 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6330 struct ieee80211_local *local = sdata->local; 6331 struct sta_info *sta; 6332 struct sk_buff *skb; 6333 struct ethhdr *ehdr; 6334 u32 ctrl_flags = 0; 6335 u32 flags = 0; 6336 int err; 6337 6338 /* mutex lock is only needed for incrementing the cookie counter */ 6339 lockdep_assert_wiphy(local->hw.wiphy); 6340 6341 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6342 * or Pre-Authentication 6343 */ 6344 if (proto != sdata->control_port_protocol && 6345 proto != cpu_to_be16(ETH_P_PREAUTH)) 6346 return -EINVAL; 6347 6348 if (proto == sdata->control_port_protocol) 6349 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6350 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6351 6352 if (unencrypted) 6353 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6354 6355 if (cookie) 6356 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6357 6358 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6359 6360 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6361 sizeof(struct ethhdr) + len); 6362 if (!skb) 6363 return -ENOMEM; 6364 6365 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6366 6367 skb_put_data(skb, buf, len); 6368 6369 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6370 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6371 6372 /* we may override the SA for MLO STA later */ 6373 if (link_id < 0) { 6374 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6375 IEEE80211_TX_CTRL_MLO_LINK); 6376 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6377 } else { 6378 struct ieee80211_bss_conf *link_conf; 6379 6380 ctrl_flags |= u32_encode_bits(link_id, 6381 IEEE80211_TX_CTRL_MLO_LINK); 6382 6383 rcu_read_lock(); 6384 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6385 if (!link_conf) { 6386 dev_kfree_skb(skb); 6387 rcu_read_unlock(); 6388 return -ENOLINK; 6389 } 6390 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6391 rcu_read_unlock(); 6392 } 6393 6394 ehdr->h_proto = proto; 6395 6396 skb->dev = dev; 6397 skb->protocol = proto; 6398 skb_reset_network_header(skb); 6399 skb_reset_mac_header(skb); 6400 6401 if (local->hw.queues < IEEE80211_NUM_ACS) 6402 goto start_xmit; 6403 6404 /* update QoS header to prioritize control port frames if possible, 6405 * prioritization also happens for control port frames send over 6406 * AF_PACKET 6407 */ 6408 rcu_read_lock(); 6409 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6410 if (err) { 6411 dev_kfree_skb(skb); 6412 rcu_read_unlock(); 6413 return err; 6414 } 6415 6416 if (!IS_ERR(sta)) { 6417 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6418 6419 skb_set_queue_mapping(skb, queue); 6420 6421 /* 6422 * for MLO STA, the SA should be the AP MLD address, but 6423 * the link ID has been selected already 6424 */ 6425 if (sta && sta->sta.mlo) 6426 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6427 } 6428 rcu_read_unlock(); 6429 6430 start_xmit: 6431 local_bh_disable(); 6432 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6433 local_bh_enable(); 6434 6435 return 0; 6436 } 6437 6438 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6439 const u8 *buf, size_t len) 6440 { 6441 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6442 struct ieee80211_local *local = sdata->local; 6443 struct sk_buff *skb; 6444 6445 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6446 30 + /* header size */ 6447 18); /* 11s header size */ 6448 if (!skb) 6449 return -ENOMEM; 6450 6451 skb_reserve(skb, local->hw.extra_tx_headroom); 6452 skb_put_data(skb, buf, len); 6453 6454 skb->dev = dev; 6455 skb->protocol = htons(ETH_P_802_3); 6456 skb_reset_network_header(skb); 6457 skb_reset_mac_header(skb); 6458 6459 local_bh_disable(); 6460 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6461 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6462 NULL); 6463 local_bh_enable(); 6464 6465 return 0; 6466 } 6467