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 __ieee80211_start_scan() for more. 291 */ 292 return TX_DROP; 293 294 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 295 return TX_CONTINUE; 296 297 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 298 return TX_CONTINUE; 299 300 if (tx->sta) 301 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 302 303 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 304 if (unlikely(!assoc && 305 ieee80211_is_data(hdr->frame_control))) { 306 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 307 sdata_info(tx->sdata, 308 "dropped data frame to not associated station %pM\n", 309 hdr->addr1); 310 #endif 311 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 312 return TX_DROP; 313 } 314 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 315 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 316 /* 317 * No associated STAs - no need to send multicast 318 * frames. 319 */ 320 return TX_DROP; 321 } 322 323 return TX_CONTINUE; 324 } 325 326 /* This function is called whenever the AP is about to exceed the maximum limit 327 * of buffered frames for power saving STAs. This situation should not really 328 * happen often during normal operation, so dropping the oldest buffered packet 329 * from each queue should be OK to make some room for new frames. */ 330 static void purge_old_ps_buffers(struct ieee80211_local *local) 331 { 332 int total = 0, purged = 0; 333 struct sk_buff *skb; 334 struct ieee80211_sub_if_data *sdata; 335 struct sta_info *sta; 336 337 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 338 struct ps_data *ps; 339 340 if (sdata->vif.type == NL80211_IFTYPE_AP) 341 ps = &sdata->u.ap.ps; 342 else if (ieee80211_vif_is_mesh(&sdata->vif)) 343 ps = &sdata->u.mesh.ps; 344 else 345 continue; 346 347 skb = skb_dequeue(&ps->bc_buf); 348 if (skb) { 349 purged++; 350 ieee80211_free_txskb(&local->hw, skb); 351 } 352 total += skb_queue_len(&ps->bc_buf); 353 } 354 355 /* 356 * Drop one frame from each station from the lowest-priority 357 * AC that has frames at all. 358 */ 359 list_for_each_entry_rcu(sta, &local->sta_list, list) { 360 int ac; 361 362 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 363 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 364 total += skb_queue_len(&sta->ps_tx_buf[ac]); 365 if (skb) { 366 purged++; 367 ieee80211_free_txskb(&local->hw, skb); 368 break; 369 } 370 } 371 } 372 373 local->total_ps_buffered = total; 374 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 375 } 376 377 static ieee80211_tx_result 378 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 379 { 380 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 382 struct ps_data *ps; 383 384 /* 385 * broadcast/multicast frame 386 * 387 * If any of the associated/peer stations is in power save mode, 388 * the frame is buffered to be sent after DTIM beacon frame. 389 * This is done either by the hardware or us. 390 */ 391 392 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 393 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 394 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 395 if (!tx->sdata->bss) 396 return TX_CONTINUE; 397 398 ps = &tx->sdata->bss->ps; 399 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 400 ps = &tx->sdata->u.mesh.ps; 401 } else { 402 return TX_CONTINUE; 403 } 404 405 406 /* no buffering for ordered frames */ 407 if (ieee80211_has_order(hdr->frame_control)) 408 return TX_CONTINUE; 409 410 if (ieee80211_is_probe_req(hdr->frame_control)) 411 return TX_CONTINUE; 412 413 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 414 info->hw_queue = tx->sdata->vif.cab_queue; 415 416 /* no stations in PS mode and no buffered packets */ 417 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 418 return TX_CONTINUE; 419 420 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 421 422 /* device releases frame after DTIM beacon */ 423 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 424 return TX_CONTINUE; 425 426 /* buffered in mac80211 */ 427 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 428 purge_old_ps_buffers(tx->local); 429 430 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 431 ps_dbg(tx->sdata, 432 "BC TX buffer full - dropping the oldest frame\n"); 433 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 434 } else 435 tx->local->total_ps_buffered++; 436 437 skb_queue_tail(&ps->bc_buf, tx->skb); 438 439 return TX_QUEUED; 440 } 441 442 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 443 struct sk_buff *skb) 444 { 445 if (!ieee80211_is_mgmt(fc)) 446 return 0; 447 448 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 449 return 0; 450 451 if (!ieee80211_is_robust_mgmt_frame(skb)) 452 return 0; 453 454 return 1; 455 } 456 457 static ieee80211_tx_result 458 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 459 { 460 struct sta_info *sta = tx->sta; 461 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 463 struct ieee80211_local *local = tx->local; 464 465 if (unlikely(!sta)) 466 return TX_CONTINUE; 467 468 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 469 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 470 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 471 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 472 int ac = skb_get_queue_mapping(tx->skb); 473 474 if (ieee80211_is_mgmt(hdr->frame_control) && 475 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 476 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 477 return TX_CONTINUE; 478 } 479 480 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 481 sta->sta.addr, sta->sta.aid, ac); 482 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 483 purge_old_ps_buffers(tx->local); 484 485 /* sync with ieee80211_sta_ps_deliver_wakeup */ 486 spin_lock(&sta->ps_lock); 487 /* 488 * STA woke up the meantime and all the frames on ps_tx_buf have 489 * been queued to pending queue. No reordering can happen, go 490 * ahead and Tx the packet. 491 */ 492 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 493 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 494 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 495 spin_unlock(&sta->ps_lock); 496 return TX_CONTINUE; 497 } 498 499 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 500 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 501 ps_dbg(tx->sdata, 502 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 503 sta->sta.addr, ac); 504 ieee80211_free_txskb(&local->hw, old); 505 } else 506 tx->local->total_ps_buffered++; 507 508 info->control.jiffies = jiffies; 509 info->control.vif = &tx->sdata->vif; 510 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 511 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 512 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 513 spin_unlock(&sta->ps_lock); 514 515 if (!timer_pending(&local->sta_cleanup)) 516 mod_timer(&local->sta_cleanup, 517 round_jiffies(jiffies + 518 STA_INFO_CLEANUP_INTERVAL)); 519 520 /* 521 * We queued up some frames, so the TIM bit might 522 * need to be set, recalculate it. 523 */ 524 sta_info_recalc_tim(sta); 525 526 return TX_QUEUED; 527 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 528 ps_dbg(tx->sdata, 529 "STA %pM in PS mode, but polling/in SP -> send frame\n", 530 sta->sta.addr); 531 } 532 533 return TX_CONTINUE; 534 } 535 536 static ieee80211_tx_result debug_noinline 537 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 538 { 539 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 540 return TX_CONTINUE; 541 542 if (tx->flags & IEEE80211_TX_UNICAST) 543 return ieee80211_tx_h_unicast_ps_buf(tx); 544 else 545 return ieee80211_tx_h_multicast_ps_buf(tx); 546 } 547 548 static ieee80211_tx_result debug_noinline 549 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 550 { 551 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 552 553 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 554 if (tx->sdata->control_port_no_encrypt) 555 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 556 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 557 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 558 } 559 560 return TX_CONTINUE; 561 } 562 563 static struct ieee80211_key * 564 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 565 { 566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 struct ieee80211_link_data *link; 569 unsigned int link_id; 570 571 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 572 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 573 link = &tx->sdata->deflink; 574 } else { 575 link = rcu_dereference(tx->sdata->link[link_id]); 576 if (!link) 577 return NULL; 578 } 579 580 if (ieee80211_is_group_privacy_action(tx->skb)) 581 return rcu_dereference(link->default_multicast_key); 582 else if (ieee80211_is_mgmt(hdr->frame_control) && 583 is_multicast_ether_addr(hdr->addr1) && 584 ieee80211_is_robust_mgmt_frame(tx->skb)) 585 return rcu_dereference(link->default_mgmt_key); 586 else if (is_multicast_ether_addr(hdr->addr1)) 587 return rcu_dereference(link->default_multicast_key); 588 589 return NULL; 590 } 591 592 static ieee80211_tx_result debug_noinline 593 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 594 { 595 struct ieee80211_key *key; 596 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 597 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 598 599 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 600 tx->key = NULL; 601 return TX_CONTINUE; 602 } 603 604 if (tx->sta && 605 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 606 tx->key = key; 607 else if ((key = ieee80211_select_link_key(tx))) 608 tx->key = key; 609 else if (!is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_unicast_key))) 611 tx->key = key; 612 else 613 tx->key = NULL; 614 615 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 616 if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 617 info->control.hw_key = &tx->key->conf; 618 return TX_CONTINUE; 619 } 620 621 if (tx->key) { 622 bool skip_hw = false; 623 624 /* TODO: add threshold stuff again */ 625 626 switch (tx->key->conf.cipher) { 627 case WLAN_CIPHER_SUITE_WEP40: 628 case WLAN_CIPHER_SUITE_WEP104: 629 case WLAN_CIPHER_SUITE_TKIP: 630 if (!ieee80211_is_data_present(hdr->frame_control)) 631 tx->key = NULL; 632 break; 633 case WLAN_CIPHER_SUITE_CCMP: 634 case WLAN_CIPHER_SUITE_CCMP_256: 635 case WLAN_CIPHER_SUITE_GCMP: 636 case WLAN_CIPHER_SUITE_GCMP_256: 637 if (!ieee80211_is_data_present(hdr->frame_control) && 638 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 639 tx->skb) && 640 !ieee80211_is_group_privacy_action(tx->skb) && 641 !ieee80211_require_encrypted_assoc(hdr->frame_control, 642 tx->sta)) 643 tx->key = NULL; 644 else 645 skip_hw = (tx->key->conf.flags & 646 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 647 ieee80211_is_mgmt(hdr->frame_control); 648 break; 649 case WLAN_CIPHER_SUITE_AES_CMAC: 650 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 651 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 652 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 653 if (!ieee80211_is_mgmt(hdr->frame_control)) 654 tx->key = NULL; 655 break; 656 } 657 658 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 659 !ieee80211_is_deauth(hdr->frame_control)) && 660 tx->skb->protocol != tx->sdata->control_port_protocol) 661 return TX_DROP; 662 663 if (!skip_hw && tx->key && 664 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 665 info->control.hw_key = &tx->key->conf; 666 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 667 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 668 return TX_DROP; 669 } 670 671 return TX_CONTINUE; 672 } 673 674 static ieee80211_tx_result debug_noinline 675 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 676 { 677 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 678 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 679 struct ieee80211_supported_band *sband; 680 u32 len; 681 struct ieee80211_tx_rate_control txrc; 682 struct ieee80211_sta_rates *ratetbl = NULL; 683 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 684 bool assoc = false; 685 686 memset(&txrc, 0, sizeof(txrc)); 687 688 if (info->band < NUM_NL80211_BANDS) 689 sband = tx->local->hw.wiphy->bands[info->band]; 690 else 691 return TX_CONTINUE; 692 693 len = min_t(u32, tx->skb->len + FCS_LEN, 694 tx->local->hw.wiphy->frag_threshold); 695 696 /* set up the tx rate control struct we give the RC algo */ 697 txrc.hw = &tx->local->hw; 698 txrc.sband = sband; 699 txrc.bss_conf = &tx->sdata->vif.bss_conf; 700 txrc.skb = tx->skb; 701 txrc.reported_rate.idx = -1; 702 703 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 704 txrc.rate_idx_mask = ~0; 705 } else { 706 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 707 708 if (tx->sdata->rc_has_mcs_mask[info->band]) 709 txrc.rate_idx_mcs_mask = 710 tx->sdata->rc_rateidx_mcs_mask[info->band]; 711 } 712 713 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 714 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 715 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 716 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 717 718 /* set up RTS protection if desired */ 719 if (len > tx->local->hw.wiphy->rts_threshold) { 720 txrc.rts = true; 721 } 722 723 info->control.use_rts = txrc.rts; 724 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 725 726 /* 727 * Use short preamble if the BSS can handle it, but not for 728 * management frames unless we know the receiver can handle 729 * that -- the management frame might be to a station that 730 * just wants a probe response. 731 */ 732 if (tx->sdata->vif.bss_conf.use_short_preamble && 733 (ieee80211_is_tx_data(tx->skb) || 734 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 735 txrc.short_preamble = true; 736 737 info->control.short_preamble = txrc.short_preamble; 738 739 /* don't ask rate control when rate already injected via radiotap */ 740 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 741 return TX_CONTINUE; 742 743 if (tx->sta) 744 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 745 746 /* 747 * Lets not bother rate control if we're associated and cannot 748 * talk to the sta. This should not happen. 749 */ 750 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 751 !rate_usable_index_exists(sband, &tx->sta->sta), 752 "%s: Dropped data frame as no usable bitrate found while " 753 "scanning and associated. Target station: " 754 "%pM on %d GHz band\n", 755 tx->sdata->name, 756 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 757 info->band ? 5 : 2)) 758 return TX_DROP; 759 760 /* 761 * If we're associated with the sta at this point we know we can at 762 * least send the frame at the lowest bit rate. 763 */ 764 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 765 766 if (tx->sta && !info->control.skip_table) 767 ratetbl = rcu_dereference(tx->sta->sta.rates); 768 769 if (unlikely(info->control.rates[0].idx < 0)) { 770 if (ratetbl) { 771 struct ieee80211_tx_rate rate = { 772 .idx = ratetbl->rate[0].idx, 773 .flags = ratetbl->rate[0].flags, 774 .count = ratetbl->rate[0].count 775 }; 776 777 if (ratetbl->rate[0].idx < 0) 778 return TX_DROP; 779 780 tx->rate = rate; 781 } else { 782 return TX_DROP; 783 } 784 } else { 785 tx->rate = info->control.rates[0]; 786 } 787 788 if (txrc.reported_rate.idx < 0) { 789 txrc.reported_rate = tx->rate; 790 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 791 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 792 } else if (tx->sta) 793 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 794 795 if (ratetbl) 796 return TX_CONTINUE; 797 798 if (unlikely(!info->control.rates[0].count)) 799 info->control.rates[0].count = 1; 800 801 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 802 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 803 info->control.rates[0].count = 1; 804 805 return TX_CONTINUE; 806 } 807 808 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 809 { 810 u16 *seq = &sta->tid_seq[tid]; 811 __le16 ret = cpu_to_le16(*seq); 812 813 /* Increase the sequence number. */ 814 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 815 816 return ret; 817 } 818 819 static ieee80211_tx_result debug_noinline 820 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 821 { 822 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 824 int tid; 825 826 /* 827 * Packet injection may want to control the sequence 828 * number, if we have no matching interface then we 829 * neither assign one ourselves nor ask the driver to. 830 */ 831 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 832 return TX_CONTINUE; 833 834 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 835 return TX_CONTINUE; 836 837 if (ieee80211_hdrlen(hdr->frame_control) < 24) 838 return TX_CONTINUE; 839 840 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 841 return TX_CONTINUE; 842 843 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 844 return TX_CONTINUE; 845 846 /* SNS11 from 802.11be 10.3.2.14 */ 847 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 848 ieee80211_vif_is_mld(info->control.vif) && 849 info->control.vif->type == NL80211_IFTYPE_AP)) { 850 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 851 tx->sdata->mld_mcast_seq += 0x10; 852 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 853 return TX_CONTINUE; 854 } 855 856 /* 857 * Anything but QoS data that has a sequence number field 858 * (is long enough) gets a sequence number from the global 859 * counter. QoS data frames with a multicast destination 860 * also use the global counter (802.11-2012 9.3.2.10). 861 */ 862 if (!ieee80211_is_data_qos(hdr->frame_control) || 863 is_multicast_ether_addr(hdr->addr1)) { 864 /* driver should assign sequence number */ 865 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 866 /* for pure STA mode without beacons, we can do it */ 867 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 868 tx->sdata->sequence_number += 0x10; 869 if (tx->sta) 870 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 871 return TX_CONTINUE; 872 } 873 874 /* 875 * This should be true for injected/management frames only, for 876 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 877 * above since they are not QoS-data frames. 878 */ 879 if (!tx->sta) 880 return TX_CONTINUE; 881 882 /* include per-STA, per-TID sequence counter */ 883 tid = ieee80211_get_tid(hdr); 884 tx->sta->deflink.tx_stats.msdu[tid]++; 885 886 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 887 888 return TX_CONTINUE; 889 } 890 891 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 892 struct sk_buff *skb, int hdrlen, 893 int frag_threshold) 894 { 895 struct ieee80211_local *local = tx->local; 896 struct ieee80211_tx_info *info; 897 struct sk_buff *tmp; 898 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 899 int pos = hdrlen + per_fragm; 900 int rem = skb->len - hdrlen - per_fragm; 901 902 if (WARN_ON(rem < 0)) 903 return -EINVAL; 904 905 /* first fragment was already added to queue by caller */ 906 907 while (rem) { 908 int fraglen = per_fragm; 909 910 if (fraglen > rem) 911 fraglen = rem; 912 rem -= fraglen; 913 tmp = dev_alloc_skb(local->tx_headroom + 914 frag_threshold + 915 IEEE80211_ENCRYPT_HEADROOM + 916 IEEE80211_ENCRYPT_TAILROOM); 917 if (!tmp) 918 return -ENOMEM; 919 920 __skb_queue_tail(&tx->skbs, tmp); 921 922 skb_reserve(tmp, 923 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 924 925 /* copy control information */ 926 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 927 928 info = IEEE80211_SKB_CB(tmp); 929 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 930 IEEE80211_TX_CTL_FIRST_FRAGMENT); 931 932 if (rem) 933 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 934 935 skb_copy_queue_mapping(tmp, skb); 936 tmp->priority = skb->priority; 937 tmp->dev = skb->dev; 938 939 /* copy header and data */ 940 skb_put_data(tmp, skb->data, hdrlen); 941 skb_put_data(tmp, skb->data + pos, fraglen); 942 943 pos += fraglen; 944 } 945 946 /* adjust first fragment's length */ 947 skb_trim(skb, hdrlen + per_fragm); 948 return 0; 949 } 950 951 static ieee80211_tx_result debug_noinline 952 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 953 { 954 struct sk_buff *skb = tx->skb; 955 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 956 struct ieee80211_hdr *hdr = (void *)skb->data; 957 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 958 int hdrlen; 959 int fragnum; 960 961 /* no matter what happens, tx->skb moves to tx->skbs */ 962 __skb_queue_tail(&tx->skbs, skb); 963 tx->skb = NULL; 964 965 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 966 return TX_CONTINUE; 967 968 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 969 return TX_CONTINUE; 970 971 /* 972 * Warn when submitting a fragmented A-MPDU frame and drop it. 973 * This scenario is handled in ieee80211_tx_prepare but extra 974 * caution taken here as fragmented ampdu may cause Tx stop. 975 */ 976 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 977 return TX_DROP; 978 979 hdrlen = ieee80211_hdrlen(hdr->frame_control); 980 981 /* internal error, why isn't DONTFRAG set? */ 982 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 983 return TX_DROP; 984 985 /* 986 * Now fragment the frame. This will allocate all the fragments and 987 * chain them (using skb as the first fragment) to skb->next. 988 * During transmission, we will remove the successfully transmitted 989 * fragments from this list. When the low-level driver rejects one 990 * of the fragments then we will simply pretend to accept the skb 991 * but store it away as pending. 992 */ 993 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 994 return TX_DROP; 995 996 /* update duration/seq/flags of fragments */ 997 fragnum = 0; 998 999 skb_queue_walk(&tx->skbs, skb) { 1000 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1001 1002 hdr = (void *)skb->data; 1003 info = IEEE80211_SKB_CB(skb); 1004 1005 if (!skb_queue_is_last(&tx->skbs, skb)) { 1006 hdr->frame_control |= morefrags; 1007 /* 1008 * No multi-rate retries for fragmented frames, that 1009 * would completely throw off the NAV at other STAs. 1010 */ 1011 info->control.rates[1].idx = -1; 1012 info->control.rates[2].idx = -1; 1013 info->control.rates[3].idx = -1; 1014 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1015 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1016 } else { 1017 hdr->frame_control &= ~morefrags; 1018 } 1019 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1020 fragnum++; 1021 } 1022 1023 return TX_CONTINUE; 1024 } 1025 1026 static ieee80211_tx_result debug_noinline 1027 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1028 { 1029 struct sk_buff *skb; 1030 int ac = -1; 1031 1032 if (!tx->sta) 1033 return TX_CONTINUE; 1034 1035 skb_queue_walk(&tx->skbs, skb) { 1036 ac = skb_get_queue_mapping(skb); 1037 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1038 } 1039 if (ac >= 0) 1040 tx->sta->deflink.tx_stats.packets[ac]++; 1041 1042 return TX_CONTINUE; 1043 } 1044 1045 static ieee80211_tx_result debug_noinline 1046 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1047 { 1048 if (!tx->key) 1049 return TX_CONTINUE; 1050 1051 switch (tx->key->conf.cipher) { 1052 case WLAN_CIPHER_SUITE_WEP40: 1053 case WLAN_CIPHER_SUITE_WEP104: 1054 return ieee80211_crypto_wep_encrypt(tx); 1055 case WLAN_CIPHER_SUITE_TKIP: 1056 return ieee80211_crypto_tkip_encrypt(tx); 1057 case WLAN_CIPHER_SUITE_CCMP: 1058 return ieee80211_crypto_ccmp_encrypt( 1059 tx, IEEE80211_CCMP_MIC_LEN); 1060 case WLAN_CIPHER_SUITE_CCMP_256: 1061 return ieee80211_crypto_ccmp_encrypt( 1062 tx, IEEE80211_CCMP_256_MIC_LEN); 1063 case WLAN_CIPHER_SUITE_AES_CMAC: 1064 return ieee80211_crypto_aes_cmac_encrypt( 1065 tx, IEEE80211_CMAC_128_MIC_LEN); 1066 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1067 return ieee80211_crypto_aes_cmac_encrypt( 1068 tx, IEEE80211_CMAC_256_MIC_LEN); 1069 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1070 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1071 return ieee80211_crypto_aes_gmac_encrypt(tx); 1072 case WLAN_CIPHER_SUITE_GCMP: 1073 case WLAN_CIPHER_SUITE_GCMP_256: 1074 return ieee80211_crypto_gcmp_encrypt(tx); 1075 } 1076 1077 return TX_DROP; 1078 } 1079 1080 static ieee80211_tx_result debug_noinline 1081 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1082 { 1083 struct sk_buff *skb; 1084 struct ieee80211_hdr *hdr; 1085 int next_len; 1086 bool group_addr; 1087 1088 skb_queue_walk(&tx->skbs, skb) { 1089 hdr = (void *) skb->data; 1090 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1091 break; /* must not overwrite AID */ 1092 if (!skb_queue_is_last(&tx->skbs, skb)) { 1093 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1094 next_len = next->len; 1095 } else 1096 next_len = 0; 1097 group_addr = is_multicast_ether_addr(hdr->addr1); 1098 1099 hdr->duration_id = 1100 ieee80211_duration(tx, skb, group_addr, next_len); 1101 } 1102 1103 return TX_CONTINUE; 1104 } 1105 1106 /* actual transmit path */ 1107 1108 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1109 struct sk_buff *skb, 1110 struct ieee80211_tx_info *info, 1111 struct tid_ampdu_tx *tid_tx, 1112 int tid) 1113 { 1114 bool queued = false; 1115 bool reset_agg_timer = false; 1116 struct sk_buff *purge_skb = NULL; 1117 1118 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1119 reset_agg_timer = true; 1120 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1121 /* 1122 * nothing -- this aggregation session is being started 1123 * but that might still fail with the driver 1124 */ 1125 } else if (!tx->sta->sta.txq[tid]) { 1126 spin_lock(&tx->sta->lock); 1127 /* 1128 * Need to re-check now, because we may get here 1129 * 1130 * 1) in the window during which the setup is actually 1131 * already done, but not marked yet because not all 1132 * packets are spliced over to the driver pending 1133 * queue yet -- if this happened we acquire the lock 1134 * either before or after the splice happens, but 1135 * need to recheck which of these cases happened. 1136 * 1137 * 2) during session teardown, if the OPERATIONAL bit 1138 * was cleared due to the teardown but the pointer 1139 * hasn't been assigned NULL yet (or we loaded it 1140 * before it was assigned) -- in this case it may 1141 * now be NULL which means we should just let the 1142 * packet pass through because splicing the frames 1143 * back is already done. 1144 */ 1145 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1146 1147 if (!tid_tx) { 1148 /* do nothing, let packet pass through */ 1149 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1150 reset_agg_timer = true; 1151 } else { 1152 queued = true; 1153 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1154 clear_sta_flag(tx->sta, WLAN_STA_SP); 1155 ps_dbg(tx->sta->sdata, 1156 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1157 tx->sta->sta.addr, tx->sta->sta.aid); 1158 } 1159 info->control.vif = &tx->sdata->vif; 1160 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1161 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1162 __skb_queue_tail(&tid_tx->pending, skb); 1163 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1164 purge_skb = __skb_dequeue(&tid_tx->pending); 1165 } 1166 spin_unlock(&tx->sta->lock); 1167 1168 if (purge_skb) 1169 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1170 } 1171 1172 /* reset session timer */ 1173 if (reset_agg_timer) 1174 tid_tx->last_tx = jiffies; 1175 1176 return queued; 1177 } 1178 1179 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1180 struct sta_info *sta, struct sk_buff *skb) 1181 { 1182 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1183 u16 tid; 1184 1185 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1186 return; 1187 1188 if (!sta || 1189 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1190 !sta->sta.deflink.s1g_cap.s1g) || 1191 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1192 skb->protocol == sdata->control_port_protocol) 1193 return; 1194 1195 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1196 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1197 return; 1198 1199 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1200 } 1201 1202 /* 1203 * initialises @tx 1204 * pass %NULL for the station if unknown, a valid pointer if known 1205 * or an ERR_PTR() if the station is known not to exist 1206 */ 1207 static ieee80211_tx_result 1208 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1209 struct ieee80211_tx_data *tx, 1210 struct sta_info *sta, struct sk_buff *skb) 1211 { 1212 struct ieee80211_local *local = sdata->local; 1213 struct ieee80211_hdr *hdr; 1214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1215 bool aggr_check = false; 1216 int tid; 1217 1218 memset(tx, 0, sizeof(*tx)); 1219 tx->skb = skb; 1220 tx->local = local; 1221 tx->sdata = sdata; 1222 __skb_queue_head_init(&tx->skbs); 1223 1224 /* 1225 * If this flag is set to true anywhere, and we get here, 1226 * we are doing the needed processing, so remove the flag 1227 * now. 1228 */ 1229 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1230 1231 hdr = (struct ieee80211_hdr *) skb->data; 1232 1233 if (likely(sta)) { 1234 if (!IS_ERR(sta)) 1235 tx->sta = sta; 1236 } else { 1237 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1238 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1239 if (!tx->sta && sdata->wdev.use_4addr) 1240 return TX_DROP; 1241 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1242 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1243 } 1244 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1245 tx->sta = sta_info_get(sdata, hdr->addr1); 1246 aggr_check = true; 1247 } 1248 } 1249 1250 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1251 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1252 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1253 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1254 struct tid_ampdu_tx *tid_tx; 1255 1256 tid = ieee80211_get_tid(hdr); 1257 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1258 if (!tid_tx && aggr_check) { 1259 ieee80211_aggr_check(sdata, tx->sta, skb); 1260 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1261 } 1262 1263 if (tid_tx) { 1264 bool queued; 1265 1266 queued = ieee80211_tx_prep_agg(tx, skb, info, 1267 tid_tx, tid); 1268 1269 if (unlikely(queued)) 1270 return TX_QUEUED; 1271 } 1272 } 1273 1274 if (is_multicast_ether_addr(hdr->addr1)) { 1275 tx->flags &= ~IEEE80211_TX_UNICAST; 1276 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1277 } else 1278 tx->flags |= IEEE80211_TX_UNICAST; 1279 1280 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1281 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1282 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1283 info->flags & IEEE80211_TX_CTL_AMPDU) 1284 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1285 } 1286 1287 if (!tx->sta) 1288 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1289 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1290 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1291 ieee80211_check_fast_xmit(tx->sta); 1292 } 1293 1294 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1295 1296 return TX_CONTINUE; 1297 } 1298 1299 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1300 struct ieee80211_vif *vif, 1301 struct sta_info *sta, 1302 struct sk_buff *skb) 1303 { 1304 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1305 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1306 struct ieee80211_txq *txq = NULL; 1307 1308 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1309 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1310 return NULL; 1311 1312 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1313 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1314 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1315 ieee80211_is_bufferable_mmpdu(skb) || 1316 vif->type == NL80211_IFTYPE_STATION || 1317 vif->type == NL80211_IFTYPE_NAN || 1318 vif->type == NL80211_IFTYPE_NAN_DATA) && 1319 sta && sta->uploaded) { 1320 /* 1321 * This will be NULL if the driver didn't set the 1322 * opt-in hardware flag. 1323 */ 1324 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1325 } else if ((!ieee80211_is_mgmt(hdr->frame_control) || 1326 ieee80211_is_bufferable_mmpdu(skb)) && 1327 !sta) { 1328 txq = vif->txq_mgmt; 1329 } 1330 } else if (sta) { 1331 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1332 1333 if (!sta->uploaded) 1334 return NULL; 1335 1336 txq = sta->sta.txq[tid]; 1337 } else { 1338 txq = vif->txq; 1339 } 1340 1341 if (!txq) 1342 return NULL; 1343 1344 return to_txq_info(txq); 1345 } 1346 1347 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1348 { 1349 struct sk_buff *next; 1350 codel_time_t now = codel_get_time(); 1351 1352 skb_list_walk_safe(skb, skb, next) 1353 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1354 } 1355 1356 static u32 codel_skb_len_func(const struct sk_buff *skb) 1357 { 1358 return skb->len; 1359 } 1360 1361 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1362 { 1363 const struct ieee80211_tx_info *info; 1364 1365 info = (const struct ieee80211_tx_info *)skb->cb; 1366 return info->control.enqueue_time; 1367 } 1368 1369 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1370 void *ctx) 1371 { 1372 struct ieee80211_local *local; 1373 struct txq_info *txqi; 1374 struct fq *fq; 1375 struct fq_flow *flow; 1376 1377 txqi = ctx; 1378 local = vif_to_sdata(txqi->txq.vif)->local; 1379 fq = &local->fq; 1380 1381 if (cvars == &txqi->def_cvars) 1382 flow = &txqi->tin.default_flow; 1383 else 1384 flow = &fq->flows[cvars - local->cvars]; 1385 1386 return fq_flow_dequeue(fq, flow); 1387 } 1388 1389 static void codel_drop_func(struct sk_buff *skb, 1390 void *ctx) 1391 { 1392 struct ieee80211_local *local; 1393 struct ieee80211_hw *hw; 1394 struct txq_info *txqi; 1395 1396 txqi = ctx; 1397 local = vif_to_sdata(txqi->txq.vif)->local; 1398 hw = &local->hw; 1399 1400 ieee80211_free_txskb(hw, skb); 1401 } 1402 1403 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1404 struct fq_tin *tin, 1405 struct fq_flow *flow) 1406 { 1407 struct ieee80211_local *local; 1408 struct txq_info *txqi; 1409 struct codel_vars *cvars; 1410 struct codel_params *cparams; 1411 struct codel_stats *cstats; 1412 1413 local = container_of(fq, struct ieee80211_local, fq); 1414 txqi = container_of(tin, struct txq_info, tin); 1415 cparams = &local->cparams; 1416 cstats = &txqi->cstats; 1417 1418 if (flow == &tin->default_flow) 1419 cvars = &txqi->def_cvars; 1420 else 1421 cvars = &local->cvars[flow - fq->flows]; 1422 1423 return codel_dequeue(txqi, 1424 &flow->backlog, 1425 cparams, 1426 cvars, 1427 cstats, 1428 codel_skb_len_func, 1429 codel_skb_time_func, 1430 codel_drop_func, 1431 codel_dequeue_func); 1432 } 1433 1434 static void fq_skb_free_func(struct fq *fq, 1435 struct fq_tin *tin, 1436 struct fq_flow *flow, 1437 struct sk_buff *skb) 1438 { 1439 struct ieee80211_local *local; 1440 1441 local = container_of(fq, struct ieee80211_local, fq); 1442 ieee80211_free_txskb(&local->hw, skb); 1443 } 1444 1445 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1446 struct txq_info *txqi, 1447 struct sk_buff *skb) 1448 { 1449 struct fq *fq = &local->fq; 1450 struct fq_tin *tin = &txqi->tin; 1451 u32 flow_idx; 1452 1453 ieee80211_set_skb_enqueue_time(skb); 1454 1455 spin_lock_bh(&fq->lock); 1456 /* 1457 * For management frames, don't really apply codel etc., 1458 * we don't want to apply any shaping or anything we just 1459 * want to simplify the driver API by having them on the 1460 * txqi. 1461 */ 1462 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1463 IEEE80211_SKB_CB(skb)->control.flags |= 1464 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1465 __skb_queue_tail(&txqi->frags, skb); 1466 } else { 1467 flow_idx = fq_flow_idx(fq, skb); 1468 fq_tin_enqueue(fq, tin, flow_idx, skb, 1469 fq_skb_free_func); 1470 } 1471 spin_unlock_bh(&fq->lock); 1472 } 1473 1474 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1475 struct fq_flow *flow, struct sk_buff *skb, 1476 void *data) 1477 { 1478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1479 1480 return info->control.vif == data; 1481 } 1482 1483 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1484 struct ieee80211_sub_if_data *sdata) 1485 { 1486 struct fq *fq = &local->fq; 1487 struct txq_info *txqi; 1488 struct fq_tin *tin; 1489 struct ieee80211_sub_if_data *ap; 1490 1491 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1492 return; 1493 1494 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1495 1496 if (!ap->vif.txq) 1497 return; 1498 1499 txqi = to_txq_info(ap->vif.txq); 1500 tin = &txqi->tin; 1501 1502 spin_lock_bh(&fq->lock); 1503 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1504 fq_skb_free_func); 1505 spin_unlock_bh(&fq->lock); 1506 } 1507 1508 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1509 struct sta_info *sta, 1510 struct txq_info *txqi, int tid) 1511 { 1512 fq_tin_init(&txqi->tin); 1513 codel_vars_init(&txqi->def_cvars); 1514 codel_stats_init(&txqi->cstats); 1515 __skb_queue_head_init(&txqi->frags); 1516 INIT_LIST_HEAD(&txqi->schedule_order); 1517 1518 txqi->txq.vif = &sdata->vif; 1519 1520 if (!sta) { 1521 txqi->txq.tid = tid; 1522 1523 if (tid == IEEE80211_NUM_TIDS) { 1524 sdata->vif.txq_mgmt = &txqi->txq; 1525 txqi->txq.ac = IEEE80211_AC_VO; 1526 } else { 1527 sdata->vif.txq = &txqi->txq; 1528 txqi->txq.ac = IEEE80211_AC_BE; 1529 } 1530 1531 return; 1532 } 1533 1534 if (tid == IEEE80211_NUM_TIDS) { 1535 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1536 /* Drivers need to opt in to the management MPDU TXQ */ 1537 if (!ieee80211_hw_check(&sdata->local->hw, 1538 STA_MMPDU_TXQ)) 1539 return; 1540 } else if (!ieee80211_hw_check(&sdata->local->hw, 1541 BUFF_MMPDU_TXQ)) { 1542 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1543 return; 1544 } 1545 txqi->txq.ac = IEEE80211_AC_VO; 1546 } else { 1547 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1548 } 1549 1550 txqi->txq.sta = &sta->sta; 1551 txqi->txq.tid = tid; 1552 sta->sta.txq[tid] = &txqi->txq; 1553 } 1554 1555 void ieee80211_txq_purge(struct ieee80211_local *local, 1556 struct txq_info *txqi) 1557 { 1558 struct fq *fq = &local->fq; 1559 struct fq_tin *tin = &txqi->tin; 1560 1561 spin_lock_bh(&fq->lock); 1562 fq_tin_reset(fq, tin, fq_skb_free_func); 1563 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1564 spin_unlock_bh(&fq->lock); 1565 1566 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1567 list_del_init(&txqi->schedule_order); 1568 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1569 } 1570 1571 void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx) 1572 { 1573 if (local->hw.wiphy->txq_limit) 1574 local->fq.limit = local->hw.wiphy->txq_limit; 1575 else 1576 local->hw.wiphy->txq_limit = local->fq.limit; 1577 1578 if (local->hw.wiphy->txq_memory_limit) 1579 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1580 else 1581 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1582 1583 if (local->hw.wiphy->txq_quantum) 1584 local->fq.quantum = local->hw.wiphy->txq_quantum; 1585 else 1586 local->hw.wiphy->txq_quantum = local->fq.quantum; 1587 } 1588 1589 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1590 { 1591 struct fq *fq = &local->fq; 1592 int ret; 1593 int i; 1594 bool supp_vht = false; 1595 enum nl80211_band band; 1596 1597 ret = fq_init(fq, 4096); 1598 if (ret) 1599 return ret; 1600 1601 /* 1602 * If the hardware doesn't support VHT, it is safe to limit the maximum 1603 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1604 */ 1605 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1606 struct ieee80211_supported_band *sband; 1607 1608 sband = local->hw.wiphy->bands[band]; 1609 if (!sband) 1610 continue; 1611 1612 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1613 } 1614 1615 if (!supp_vht) 1616 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1617 1618 codel_params_init(&local->cparams); 1619 local->cparams.interval = MS2TIME(100); 1620 local->cparams.target = MS2TIME(20); 1621 local->cparams.ecn = true; 1622 1623 local->cvars = kvzalloc_objs(local->cvars[0], fq->flows_cnt); 1624 if (!local->cvars) { 1625 spin_lock_bh(&fq->lock); 1626 fq_reset(fq, fq_skb_free_func); 1627 spin_unlock_bh(&fq->lock); 1628 return -ENOMEM; 1629 } 1630 1631 for (i = 0; i < fq->flows_cnt; i++) 1632 codel_vars_init(&local->cvars[i]); 1633 1634 ieee80211_txq_set_params(local, -1); 1635 1636 return 0; 1637 } 1638 1639 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1640 { 1641 struct fq *fq = &local->fq; 1642 1643 kvfree(local->cvars); 1644 local->cvars = NULL; 1645 1646 spin_lock_bh(&fq->lock); 1647 fq_reset(fq, fq_skb_free_func); 1648 spin_unlock_bh(&fq->lock); 1649 } 1650 1651 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1652 struct ieee80211_sub_if_data *sdata, 1653 struct sta_info *sta, 1654 struct sk_buff *skb) 1655 { 1656 struct ieee80211_vif *vif; 1657 struct txq_info *txqi; 1658 1659 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1660 return false; 1661 1662 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1663 sdata = container_of(sdata->bss, 1664 struct ieee80211_sub_if_data, u.ap); 1665 1666 vif = &sdata->vif; 1667 txqi = ieee80211_get_txq(local, vif, sta, skb); 1668 1669 if (!txqi) 1670 return false; 1671 1672 ieee80211_txq_enqueue(local, txqi, skb); 1673 1674 schedule_and_wake_txq(local, txqi); 1675 1676 return true; 1677 } 1678 1679 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1680 struct ieee80211_vif *vif, 1681 struct sta_info *sta, 1682 struct sk_buff_head *skbs, 1683 bool txpending) 1684 { 1685 struct ieee80211_tx_control control = {}; 1686 struct sk_buff *skb, *tmp; 1687 unsigned long flags; 1688 1689 skb_queue_walk_safe(skbs, skb, tmp) { 1690 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1691 int q = info->hw_queue; 1692 1693 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1694 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1695 __skb_unlink(skb, skbs); 1696 ieee80211_free_txskb(&local->hw, skb); 1697 continue; 1698 } 1699 #endif 1700 1701 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1702 if (local->queue_stop_reasons[q] || 1703 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1704 if (unlikely(info->flags & 1705 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1706 if (local->queue_stop_reasons[q] & 1707 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1708 /* 1709 * Drop off-channel frames if queues 1710 * are stopped for any reason other 1711 * than off-channel operation. Never 1712 * queue them. 1713 */ 1714 spin_unlock_irqrestore( 1715 &local->queue_stop_reason_lock, 1716 flags); 1717 ieee80211_purge_tx_queue(&local->hw, 1718 skbs); 1719 return true; 1720 } 1721 } else { 1722 1723 /* 1724 * Since queue is stopped, queue up frames for 1725 * later transmission from the tx-pending 1726 * tasklet when the queue is woken again. 1727 */ 1728 if (txpending) 1729 skb_queue_splice_init(skbs, 1730 &local->pending[q]); 1731 else 1732 skb_queue_splice_tail_init(skbs, 1733 &local->pending[q]); 1734 1735 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1736 flags); 1737 return false; 1738 } 1739 } 1740 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1741 1742 info->control.vif = vif; 1743 control.sta = sta ? &sta->sta : NULL; 1744 1745 __skb_unlink(skb, skbs); 1746 drv_tx(local, &control, skb); 1747 } 1748 1749 return true; 1750 } 1751 1752 /* 1753 * Returns false if the frame couldn't be transmitted but was queued instead. 1754 */ 1755 static bool __ieee80211_tx(struct ieee80211_local *local, 1756 struct sk_buff_head *skbs, struct sta_info *sta, 1757 bool txpending) 1758 { 1759 struct ieee80211_tx_info *info; 1760 struct ieee80211_sub_if_data *sdata; 1761 struct ieee80211_vif *vif; 1762 struct sk_buff *skb; 1763 bool result; 1764 1765 if (WARN_ON(skb_queue_empty(skbs))) 1766 return true; 1767 1768 skb = skb_peek(skbs); 1769 info = IEEE80211_SKB_CB(skb); 1770 sdata = vif_to_sdata(info->control.vif); 1771 if (sta && !sta->uploaded) 1772 sta = NULL; 1773 1774 switch (sdata->vif.type) { 1775 case NL80211_IFTYPE_MONITOR: 1776 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1777 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1778 vif = &sdata->vif; 1779 break; 1780 } 1781 sdata = rcu_dereference(local->monitor_sdata); 1782 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1783 vif = &sdata->vif; 1784 info->hw_queue = 1785 vif->hw_queue[skb_get_queue_mapping(skb)]; 1786 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1787 ieee80211_purge_tx_queue(&local->hw, skbs); 1788 return true; 1789 } else 1790 vif = NULL; 1791 break; 1792 case NL80211_IFTYPE_AP_VLAN: 1793 sdata = container_of(sdata->bss, 1794 struct ieee80211_sub_if_data, u.ap); 1795 fallthrough; 1796 default: 1797 vif = &sdata->vif; 1798 break; 1799 } 1800 1801 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1802 1803 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1804 1805 return result; 1806 } 1807 1808 /* 1809 * Invoke TX handlers, return 0 on success and non-zero if the 1810 * frame was dropped or queued. 1811 * 1812 * The handlers are split into an early and late part. The latter is everything 1813 * that can be sensitive to reordering, and will be deferred to after packets 1814 * are dequeued from the intermediate queues (when they are enabled). 1815 */ 1816 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1817 { 1818 ieee80211_tx_result res = TX_DROP; 1819 1820 #define CALL_TXH(txh) \ 1821 do { \ 1822 res = txh(tx); \ 1823 if (res != TX_CONTINUE) \ 1824 goto txh_done; \ 1825 } while (0) 1826 1827 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1828 CALL_TXH(ieee80211_tx_h_check_assoc); 1829 CALL_TXH(ieee80211_tx_h_ps_buf); 1830 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1831 CALL_TXH(ieee80211_tx_h_select_key); 1832 1833 txh_done: 1834 if (unlikely(res == TX_DROP)) { 1835 tx->sdata->tx_handlers_drop++; 1836 if (tx->skb) 1837 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1838 else 1839 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1840 return -1; 1841 } else if (unlikely(res == TX_QUEUED)) { 1842 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1843 return -1; 1844 } 1845 1846 return 0; 1847 } 1848 1849 /* 1850 * Late handlers can be called while the sta lock is held. Handlers that can 1851 * cause packets to be generated will cause deadlock! 1852 */ 1853 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1854 { 1855 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1856 ieee80211_tx_result res = TX_CONTINUE; 1857 1858 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1859 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1860 1861 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1862 __skb_queue_tail(&tx->skbs, tx->skb); 1863 tx->skb = NULL; 1864 goto txh_done; 1865 } 1866 1867 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1868 CALL_TXH(ieee80211_tx_h_sequence); 1869 CALL_TXH(ieee80211_tx_h_fragment); 1870 /* handlers after fragment must be aware of tx info fragmentation! */ 1871 CALL_TXH(ieee80211_tx_h_stats); 1872 CALL_TXH(ieee80211_tx_h_encrypt); 1873 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1874 CALL_TXH(ieee80211_tx_h_calculate_duration); 1875 #undef CALL_TXH 1876 1877 txh_done: 1878 if (unlikely(res == TX_DROP)) { 1879 tx->sdata->tx_handlers_drop++; 1880 if (tx->skb) 1881 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1882 else 1883 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1884 return -1; 1885 } else if (unlikely(res == TX_QUEUED)) { 1886 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1887 return -1; 1888 } 1889 1890 return 0; 1891 } 1892 1893 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1894 { 1895 int r = invoke_tx_handlers_early(tx); 1896 1897 if (r) 1898 return r; 1899 return invoke_tx_handlers_late(tx); 1900 } 1901 1902 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1903 struct ieee80211_vif *vif, struct sk_buff *skb, 1904 int band, struct ieee80211_sta **sta) 1905 { 1906 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1907 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1908 struct ieee80211_tx_data tx; 1909 struct sk_buff *skb2; 1910 1911 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) { 1912 kfree_skb(skb); 1913 return false; 1914 } 1915 1916 info->band = band; 1917 info->control.vif = vif; 1918 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1919 1920 if (invoke_tx_handlers(&tx)) 1921 return false; 1922 1923 if (sta) { 1924 if (tx.sta) 1925 *sta = &tx.sta->sta; 1926 else 1927 *sta = NULL; 1928 } 1929 1930 /* this function isn't suitable for fragmented data frames */ 1931 skb2 = __skb_dequeue(&tx.skbs); 1932 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1933 ieee80211_free_txskb(hw, skb2); 1934 ieee80211_purge_tx_queue(hw, &tx.skbs); 1935 return false; 1936 } 1937 1938 return true; 1939 } 1940 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1941 1942 /* 1943 * Returns false if the frame couldn't be transmitted but was queued instead. 1944 */ 1945 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1946 struct sta_info *sta, struct sk_buff *skb, 1947 bool txpending) 1948 { 1949 struct ieee80211_local *local = sdata->local; 1950 struct ieee80211_tx_data tx; 1951 ieee80211_tx_result res_prepare; 1952 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1953 bool result = true; 1954 1955 if (unlikely(skb->len < 10)) { 1956 dev_kfree_skb(skb); 1957 return true; 1958 } 1959 1960 /* initialises tx */ 1961 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1962 1963 if (unlikely(res_prepare == TX_DROP)) { 1964 ieee80211_free_txskb(&local->hw, skb); 1965 tx.sdata->tx_handlers_drop++; 1966 return true; 1967 } else if (unlikely(res_prepare == TX_QUEUED)) { 1968 return true; 1969 } 1970 1971 /* set up hw_queue value early */ 1972 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1973 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1974 info->hw_queue = 1975 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1976 1977 if (invoke_tx_handlers_early(&tx)) 1978 return true; 1979 1980 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1981 return true; 1982 1983 if (!invoke_tx_handlers_late(&tx)) 1984 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1985 1986 return result; 1987 } 1988 1989 /* device xmit handlers */ 1990 1991 enum ieee80211_encrypt { 1992 ENCRYPT_NO, 1993 ENCRYPT_MGMT, 1994 ENCRYPT_DATA, 1995 }; 1996 1997 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1998 struct sk_buff *skb, 1999 int head_need, 2000 enum ieee80211_encrypt encrypt) 2001 { 2002 struct ieee80211_local *local = sdata->local; 2003 bool enc_tailroom; 2004 int tail_need = 0; 2005 2006 enc_tailroom = encrypt == ENCRYPT_MGMT || 2007 (encrypt == ENCRYPT_DATA && 2008 sdata->crypto_tx_tailroom_needed_cnt); 2009 2010 if (enc_tailroom) { 2011 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2012 tail_need -= skb_tailroom(skb); 2013 tail_need = max_t(int, tail_need, 0); 2014 } 2015 2016 if (skb_cloned(skb) && 2017 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2018 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2019 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2020 else if (head_need || tail_need) 2021 I802_DEBUG_INC(local->tx_expand_skb_head); 2022 else 2023 return 0; 2024 2025 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2026 wiphy_debug(local->hw.wiphy, 2027 "failed to reallocate TX buffer\n"); 2028 return -ENOMEM; 2029 } 2030 2031 return 0; 2032 } 2033 2034 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2035 struct sta_info *sta, struct sk_buff *skb) 2036 { 2037 struct ieee80211_local *local = sdata->local; 2038 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2039 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2040 int headroom; 2041 enum ieee80211_encrypt encrypt; 2042 2043 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2044 encrypt = ENCRYPT_NO; 2045 else if (ieee80211_is_mgmt(hdr->frame_control)) 2046 encrypt = ENCRYPT_MGMT; 2047 else 2048 encrypt = ENCRYPT_DATA; 2049 2050 headroom = local->tx_headroom; 2051 if (encrypt != ENCRYPT_NO) 2052 headroom += IEEE80211_ENCRYPT_HEADROOM; 2053 headroom -= skb_headroom(skb); 2054 headroom = max_t(int, 0, headroom); 2055 2056 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2057 ieee80211_free_txskb(&local->hw, skb); 2058 return; 2059 } 2060 2061 /* reload after potential resize */ 2062 hdr = (struct ieee80211_hdr *) skb->data; 2063 info->control.vif = &sdata->vif; 2064 2065 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2066 if (ieee80211_is_data(hdr->frame_control) && 2067 is_unicast_ether_addr(hdr->addr1)) { 2068 if (mesh_nexthop_resolve(sdata, skb)) 2069 return; /* skb queued: don't free */ 2070 } else { 2071 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2072 } 2073 } 2074 2075 ieee80211_set_qos_hdr(sdata, skb); 2076 ieee80211_tx(sdata, sta, skb, false); 2077 } 2078 2079 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2080 { 2081 struct ieee80211_radiotap_header *rthdr = 2082 (struct ieee80211_radiotap_header *)skb->data; 2083 2084 /* check for not even having the fixed radiotap header part */ 2085 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2086 return false; /* too short to be possibly valid */ 2087 2088 /* is it a header version we can trust to find length from? */ 2089 if (unlikely(rthdr->it_version)) 2090 return false; /* only version 0 is supported */ 2091 2092 /* does the skb contain enough to deliver on the alleged length? */ 2093 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2094 return false; /* skb too short for claimed rt header extent */ 2095 2096 return true; 2097 } 2098 2099 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2100 struct net_device *dev) 2101 { 2102 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2103 struct ieee80211_radiotap_iterator iterator; 2104 struct ieee80211_radiotap_header *rthdr = 2105 (struct ieee80211_radiotap_header *) skb->data; 2106 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2107 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2108 NULL); 2109 u16 txflags; 2110 u16 rate = 0; 2111 bool rate_found = false; 2112 u8 rate_retries = 0; 2113 u16 rate_flags = 0; 2114 u8 mcs_known, mcs_flags, mcs_bw; 2115 u16 vht_known; 2116 u8 vht_mcs = 0, vht_nss = 0; 2117 int i; 2118 2119 if (!ieee80211_validate_radiotap_len(skb)) 2120 return false; 2121 2122 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2123 IEEE80211_TX_CTL_DONTFRAG; 2124 2125 /* 2126 * for every radiotap entry that is present 2127 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2128 * entries present, or -EINVAL on error) 2129 */ 2130 2131 while (!ret) { 2132 ret = ieee80211_radiotap_iterator_next(&iterator); 2133 2134 if (ret) 2135 continue; 2136 2137 /* see if this argument is something we can use */ 2138 switch (iterator.this_arg_index) { 2139 /* 2140 * You must take care when dereferencing iterator.this_arg 2141 * for multibyte types... the pointer is not aligned. Use 2142 * get_unaligned((type *)iterator.this_arg) to dereference 2143 * iterator.this_arg for type "type" safely on all arches. 2144 */ 2145 case IEEE80211_RADIOTAP_FLAGS: 2146 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2147 /* 2148 * this indicates that the skb we have been 2149 * handed has the 32-bit FCS CRC at the end... 2150 * we should react to that by snipping it off 2151 * because it will be recomputed and added 2152 * on transmission 2153 */ 2154 if (skb->len < (iterator._max_length + FCS_LEN)) 2155 return false; 2156 2157 skb_trim(skb, skb->len - FCS_LEN); 2158 } 2159 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2160 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2161 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2162 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2163 break; 2164 2165 case IEEE80211_RADIOTAP_TX_FLAGS: 2166 txflags = get_unaligned_le16(iterator.this_arg); 2167 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2168 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2169 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2170 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2171 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2172 info->control.flags |= 2173 IEEE80211_TX_CTRL_DONT_REORDER; 2174 break; 2175 2176 case IEEE80211_RADIOTAP_RATE: 2177 rate = *iterator.this_arg; 2178 rate_flags = 0; 2179 rate_found = true; 2180 break; 2181 2182 case IEEE80211_RADIOTAP_ANTENNA: 2183 /* this can appear multiple times, keep a bitmap */ 2184 /* control.antennas is only a 2-bit bitmap */ 2185 if (*iterator.this_arg < 2) 2186 info->control.antennas |= BIT(*iterator.this_arg); 2187 break; 2188 2189 case IEEE80211_RADIOTAP_DATA_RETRIES: 2190 rate_retries = *iterator.this_arg; 2191 break; 2192 2193 case IEEE80211_RADIOTAP_MCS: 2194 mcs_known = iterator.this_arg[0]; 2195 mcs_flags = iterator.this_arg[1]; 2196 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2197 break; 2198 2199 rate_found = true; 2200 rate = iterator.this_arg[2]; 2201 rate_flags = IEEE80211_TX_RC_MCS; 2202 2203 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2204 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2205 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2206 2207 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2208 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2209 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2210 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2211 2212 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2213 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2214 info->flags |= IEEE80211_TX_CTL_LDPC; 2215 2216 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2217 u8 stbc = u8_get_bits(mcs_flags, 2218 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2219 2220 info->flags |= 2221 u32_encode_bits(stbc, 2222 IEEE80211_TX_CTL_STBC); 2223 } 2224 break; 2225 2226 case IEEE80211_RADIOTAP_VHT: 2227 vht_known = get_unaligned_le16(iterator.this_arg); 2228 rate_found = true; 2229 2230 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2231 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2232 (iterator.this_arg[2] & 2233 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2234 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2235 if (vht_known & 2236 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2237 if (iterator.this_arg[3] == 1) 2238 rate_flags |= 2239 IEEE80211_TX_RC_40_MHZ_WIDTH; 2240 else if (iterator.this_arg[3] == 4) 2241 rate_flags |= 2242 IEEE80211_TX_RC_80_MHZ_WIDTH; 2243 else if (iterator.this_arg[3] == 11) 2244 rate_flags |= 2245 IEEE80211_TX_RC_160_MHZ_WIDTH; 2246 } 2247 2248 vht_mcs = iterator.this_arg[4] >> 4; 2249 if (vht_mcs > 11) 2250 vht_mcs = 0; 2251 vht_nss = iterator.this_arg[4] & 0xF; 2252 if (!vht_nss || vht_nss > 8) 2253 vht_nss = 1; 2254 break; 2255 2256 /* 2257 * Please update the file 2258 * Documentation/networking/mac80211-injection.rst 2259 * when parsing new fields here. 2260 */ 2261 2262 default: 2263 break; 2264 } 2265 } 2266 2267 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2268 return false; 2269 2270 if (rate_found) { 2271 struct ieee80211_supported_band *sband = 2272 local->hw.wiphy->bands[info->band]; 2273 2274 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2275 2276 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2277 info->control.rates[i].idx = -1; 2278 info->control.rates[i].flags = 0; 2279 info->control.rates[i].count = 0; 2280 } 2281 2282 if (rate_flags & IEEE80211_TX_RC_MCS) { 2283 /* reset antennas if not enough */ 2284 if (IEEE80211_HT_MCS_CHAINS(rate) > 2285 hweight8(info->control.antennas)) 2286 info->control.antennas = 0; 2287 2288 info->control.rates[0].idx = rate; 2289 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2290 /* reset antennas if not enough */ 2291 if (vht_nss > hweight8(info->control.antennas)) 2292 info->control.antennas = 0; 2293 2294 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2295 vht_nss); 2296 } else if (sband) { 2297 for (i = 0; i < sband->n_bitrates; i++) { 2298 if (rate * 5 != sband->bitrates[i].bitrate) 2299 continue; 2300 2301 info->control.rates[0].idx = i; 2302 break; 2303 } 2304 } 2305 2306 if (info->control.rates[0].idx < 0) 2307 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2308 2309 info->control.rates[0].flags = rate_flags; 2310 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2311 local->hw.max_rate_tries); 2312 } 2313 2314 return true; 2315 } 2316 2317 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2318 struct net_device *dev) 2319 { 2320 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2321 struct ieee80211_chanctx_conf *chanctx_conf; 2322 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2323 struct ieee80211_hdr *hdr; 2324 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2325 struct cfg80211_chan_def *chandef; 2326 u16 len_rthdr; 2327 int hdrlen; 2328 2329 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2330 if (unlikely(!ieee80211_sdata_running(sdata))) 2331 goto fail; 2332 2333 memset(info, 0, sizeof(*info)); 2334 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2335 IEEE80211_TX_CTL_INJECTED; 2336 2337 /* Sanity-check the length of the radiotap header */ 2338 if (!ieee80211_validate_radiotap_len(skb)) 2339 goto fail; 2340 2341 /* we now know there is a radiotap header with a length we can use */ 2342 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2343 2344 /* 2345 * fix up the pointers accounting for the radiotap 2346 * header still being in there. We are being given 2347 * a precooked IEEE80211 header so no need for 2348 * normal processing 2349 */ 2350 skb_set_mac_header(skb, len_rthdr); 2351 /* 2352 * these are just fixed to the end of the rt area since we 2353 * don't have any better information and at this point, nobody cares 2354 */ 2355 skb_set_network_header(skb, len_rthdr); 2356 skb_set_transport_header(skb, len_rthdr); 2357 2358 if (skb->len < len_rthdr + 2) 2359 goto fail; 2360 2361 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2362 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2363 2364 if (skb->len < len_rthdr + hdrlen) 2365 goto fail; 2366 2367 /* 2368 * Initialize skb->protocol if the injected frame is a data frame 2369 * carrying a rfc1042 header 2370 */ 2371 if (ieee80211_is_data(hdr->frame_control) && 2372 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2373 u8 *payload = (u8 *)hdr + hdrlen; 2374 2375 if (ether_addr_equal(payload, rfc1042_header)) 2376 skb->protocol = cpu_to_be16((payload[6] << 8) | 2377 payload[7]); 2378 } 2379 2380 rcu_read_lock(); 2381 2382 /* 2383 * We process outgoing injected frames that have a local address 2384 * we handle as though they are non-injected frames. 2385 * This code here isn't entirely correct, the local MAC address 2386 * isn't always enough to find the interface to use; for proper 2387 * VLAN support we have an nl80211-based mechanism. 2388 * 2389 * This is necessary, for example, for old hostapd versions that 2390 * don't use nl80211-based management TX/RX. 2391 */ 2392 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2393 if (!ieee80211_sdata_running(tmp_sdata)) 2394 continue; 2395 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2396 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2397 continue; 2398 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2399 sdata = tmp_sdata; 2400 break; 2401 } 2402 } 2403 2404 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2405 if (!chanctx_conf) { 2406 tmp_sdata = rcu_dereference(local->monitor_sdata); 2407 if (tmp_sdata) 2408 chanctx_conf = 2409 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2410 } 2411 2412 if (chanctx_conf) 2413 chandef = &chanctx_conf->def; 2414 else if (local->emulate_chanctx) 2415 chandef = &local->hw.conf.chandef; 2416 else 2417 goto fail_rcu; 2418 2419 /* 2420 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2421 * shouldn't transmit on disabled channels. 2422 */ 2423 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2424 IEEE80211_CHAN_DISABLED)) 2425 goto fail_rcu; 2426 2427 /* 2428 * Frame injection is not allowed if beaconing is not allowed 2429 * or if we need radar detection. Beaconing is usually not allowed when 2430 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2431 * Passive scan is also used in world regulatory domains where 2432 * your country is not known and as such it should be treated as 2433 * NO TX unless the channel is explicitly allowed in which case 2434 * your current regulatory domain would not have the passive scan 2435 * flag. 2436 * 2437 * Since AP mode uses monitor interfaces to inject/TX management 2438 * frames we can make AP mode the exception to this rule once it 2439 * supports radar detection as its implementation can deal with 2440 * radar detection by itself. We can do that later by adding a 2441 * monitor flag interfaces used for AP support. 2442 */ 2443 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2444 sdata->vif.type)) 2445 goto fail_rcu; 2446 2447 info->band = chandef->chan->band; 2448 2449 /* Initialize skb->priority according to frame type and TID class, 2450 * with respect to the sub interface that the frame will actually 2451 * be transmitted on. If the DONT_REORDER flag is set, the original 2452 * skb-priority is preserved to assure frames injected with this 2453 * flag are not reordered relative to each other. 2454 */ 2455 ieee80211_select_queue_80211(sdata, skb, hdr); 2456 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2457 2458 /* 2459 * Process the radiotap header. This will now take into account the 2460 * selected chandef above to accurately set injection rates and 2461 * retransmissions. 2462 */ 2463 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2464 goto fail_rcu; 2465 2466 /* remove the injection radiotap header */ 2467 skb_pull(skb, len_rthdr); 2468 2469 ieee80211_xmit(sdata, NULL, skb); 2470 rcu_read_unlock(); 2471 2472 return NETDEV_TX_OK; 2473 2474 fail_rcu: 2475 rcu_read_unlock(); 2476 fail: 2477 dev_kfree_skb(skb); 2478 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2479 } 2480 2481 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2482 { 2483 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2484 2485 return ethertype == ETH_P_TDLS && 2486 skb->len > 14 && 2487 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2488 } 2489 2490 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2491 struct sk_buff *skb, 2492 struct sta_info **sta_out) 2493 { 2494 struct sta_info *sta; 2495 2496 switch (sdata->vif.type) { 2497 case NL80211_IFTYPE_AP_VLAN: 2498 sta = rcu_dereference(sdata->u.vlan.sta); 2499 if (sta) { 2500 *sta_out = sta; 2501 return 0; 2502 } else if (sdata->wdev.use_4addr) { 2503 return -ENOLINK; 2504 } 2505 fallthrough; 2506 case NL80211_IFTYPE_AP: 2507 case NL80211_IFTYPE_OCB: 2508 case NL80211_IFTYPE_ADHOC: 2509 if (is_multicast_ether_addr(skb->data)) { 2510 *sta_out = ERR_PTR(-ENOENT); 2511 return 0; 2512 } 2513 sta = sta_info_get_bss(sdata, skb->data); 2514 break; 2515 #ifdef CONFIG_MAC80211_MESH 2516 case NL80211_IFTYPE_MESH_POINT: 2517 /* determined much later */ 2518 *sta_out = NULL; 2519 return 0; 2520 #endif 2521 case NL80211_IFTYPE_STATION: 2522 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2523 sta = sta_info_get(sdata, skb->data); 2524 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2525 if (test_sta_flag(sta, 2526 WLAN_STA_TDLS_PEER_AUTH)) { 2527 *sta_out = sta; 2528 return 0; 2529 } 2530 2531 /* 2532 * TDLS link during setup - throw out frames to 2533 * peer. Allow TDLS-setup frames to unauthorized 2534 * peers for the special case of a link teardown 2535 * after a TDLS sta is removed due to being 2536 * unreachable. 2537 */ 2538 if (!ieee80211_is_tdls_setup(skb)) 2539 return -EINVAL; 2540 } 2541 2542 } 2543 2544 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2545 if (!sta) 2546 return -ENOLINK; 2547 break; 2548 case NL80211_IFTYPE_NAN_DATA: 2549 if (is_multicast_ether_addr(skb->data)) { 2550 *sta_out = ERR_PTR(-ENOENT); 2551 return 0; 2552 } 2553 sta = sta_info_get(sdata, skb->data); 2554 break; 2555 default: 2556 return -EINVAL; 2557 } 2558 2559 *sta_out = sta ?: ERR_PTR(-ENOENT); 2560 return 0; 2561 } 2562 2563 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2564 struct sk_buff *skb, 2565 u32 *info_flags, 2566 u64 *cookie) 2567 { 2568 struct sk_buff *ack_skb; 2569 u16 info_id = 0; 2570 2571 if (skb->sk) 2572 ack_skb = skb_clone_sk(skb); 2573 else 2574 ack_skb = skb_clone(skb, GFP_ATOMIC); 2575 2576 if (ack_skb) { 2577 unsigned long flags; 2578 int id; 2579 2580 spin_lock_irqsave(&local->ack_status_lock, flags); 2581 id = idr_alloc(&local->ack_status_frames, ack_skb, 2582 1, 0x2000, GFP_ATOMIC); 2583 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2584 2585 if (id >= 0) { 2586 info_id = id; 2587 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2588 if (cookie) { 2589 *cookie = ieee80211_mgmt_tx_cookie(local); 2590 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2591 } 2592 } else { 2593 kfree_skb(ack_skb); 2594 } 2595 } 2596 2597 return info_id; 2598 } 2599 2600 /** 2601 * ieee80211_build_hdr - build 802.11 header in the given frame 2602 * @sdata: virtual interface to build the header for 2603 * @skb: the skb to build the header in 2604 * @info_flags: skb flags to set 2605 * @sta: the station pointer 2606 * @ctrl_flags: info control flags to set 2607 * @cookie: cookie pointer to fill (if not %NULL) 2608 * 2609 * This function takes the skb with 802.3 header and reformats the header to 2610 * the appropriate IEEE 802.11 header based on which interface the packet is 2611 * being transmitted on. 2612 * 2613 * Note that this function also takes care of the TX status request and 2614 * potential unsharing of the SKB - this needs to be interleaved with the 2615 * header building. 2616 * 2617 * The function requires the read-side RCU lock held 2618 * 2619 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2620 */ 2621 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2622 struct sk_buff *skb, u32 info_flags, 2623 struct sta_info *sta, u32 ctrl_flags, 2624 u64 *cookie) 2625 { 2626 struct ieee80211_local *local = sdata->local; 2627 struct ieee80211_tx_info *info; 2628 int head_need; 2629 u16 ethertype, hdrlen, meshhdrlen = 0; 2630 __le16 fc; 2631 struct ieee80211_hdr hdr; 2632 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2633 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2634 const u8 *encaps_data; 2635 int encaps_len, skip_header_bytes; 2636 bool wme_sta = false, authorized = false; 2637 bool tdls_peer; 2638 bool multicast; 2639 u16 info_id = 0; 2640 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2641 enum nl80211_band band; 2642 int ret; 2643 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2644 2645 if (IS_ERR(sta)) 2646 sta = NULL; 2647 2648 #ifdef CONFIG_MAC80211_DEBUGFS 2649 if (local->force_tx_status) 2650 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2651 #endif 2652 2653 /* convert Ethernet header to proper 802.11 header (based on 2654 * operation mode) */ 2655 ethertype = (skb->data[12] << 8) | skb->data[13]; 2656 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2657 2658 if (!ieee80211_vif_is_mld(&sdata->vif)) 2659 chanctx_conf = 2660 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2661 2662 switch (sdata->vif.type) { 2663 case NL80211_IFTYPE_AP_VLAN: 2664 if (sdata->wdev.use_4addr) { 2665 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2666 /* RA TA DA SA */ 2667 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2668 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2669 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2670 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2671 hdrlen = 30; 2672 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2673 wme_sta = sta->sta.wme; 2674 } 2675 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2676 struct ieee80211_sub_if_data *ap_sdata; 2677 2678 /* override chanctx_conf from AP (we don't have one) */ 2679 ap_sdata = container_of(sdata->bss, 2680 struct ieee80211_sub_if_data, 2681 u.ap); 2682 chanctx_conf = 2683 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2684 } 2685 if (sdata->wdev.use_4addr) 2686 break; 2687 fallthrough; 2688 case NL80211_IFTYPE_AP: 2689 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2690 /* DA BSSID SA */ 2691 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2692 2693 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2694 struct ieee80211_link_data *link; 2695 2696 link_id = sta->deflink.link_id; 2697 link = rcu_dereference(sdata->link[link_id]); 2698 if (WARN_ON(!link)) { 2699 ret = -ENOLINK; 2700 goto free; 2701 } 2702 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2703 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2704 (sta && sta->sta.mlo)) { 2705 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2706 } else { 2707 struct ieee80211_bss_conf *conf; 2708 2709 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2710 if (unlikely(!conf)) { 2711 ret = -ENOLINK; 2712 goto free; 2713 } 2714 2715 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2716 } 2717 2718 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2719 hdrlen = 24; 2720 break; 2721 #ifdef CONFIG_MAC80211_MESH 2722 case NL80211_IFTYPE_MESH_POINT: 2723 if (!is_multicast_ether_addr(skb->data)) { 2724 struct sta_info *next_hop; 2725 bool mpp_lookup = true; 2726 2727 mpath = mesh_path_lookup(sdata, skb->data); 2728 if (mpath) { 2729 mpp_lookup = false; 2730 next_hop = rcu_dereference(mpath->next_hop); 2731 if (!next_hop || 2732 !(mpath->flags & (MESH_PATH_ACTIVE | 2733 MESH_PATH_RESOLVING))) 2734 mpp_lookup = true; 2735 } 2736 2737 if (mpp_lookup) { 2738 mppath = mpp_path_lookup(sdata, skb->data); 2739 if (mppath) 2740 mppath->exp_time = jiffies; 2741 } 2742 2743 if (mppath && mpath) 2744 mesh_path_del(sdata, mpath->dst); 2745 } 2746 2747 /* 2748 * Use address extension if it is a packet from 2749 * another interface or if we know the destination 2750 * is being proxied by a portal (i.e. portal address 2751 * differs from proxied address) 2752 */ 2753 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2754 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2755 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2756 skb->data, skb->data + ETH_ALEN); 2757 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2758 NULL, NULL); 2759 } else { 2760 /* DS -> MBSS (802.11-2012 13.11.3.3). 2761 * For unicast with unknown forwarding information, 2762 * destination might be in the MBSS or if that fails 2763 * forwarded to another mesh gate. In either case 2764 * resolution will be handled in ieee80211_xmit(), so 2765 * leave the original DA. This also works for mcast */ 2766 const u8 *mesh_da = skb->data; 2767 2768 if (mppath) 2769 mesh_da = mppath->mpp; 2770 else if (mpath) 2771 mesh_da = mpath->dst; 2772 2773 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2774 mesh_da, sdata->vif.addr); 2775 if (is_multicast_ether_addr(mesh_da)) 2776 /* DA TA mSA AE:SA */ 2777 meshhdrlen = ieee80211_new_mesh_header( 2778 sdata, &mesh_hdr, 2779 skb->data + ETH_ALEN, NULL); 2780 else 2781 /* RA TA mDA mSA AE:DA SA */ 2782 meshhdrlen = ieee80211_new_mesh_header( 2783 sdata, &mesh_hdr, skb->data, 2784 skb->data + ETH_ALEN); 2785 2786 } 2787 2788 /* For injected frames, fill RA right away as nexthop lookup 2789 * will be skipped. 2790 */ 2791 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2792 is_zero_ether_addr(hdr.addr1)) 2793 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2794 break; 2795 #endif 2796 case NL80211_IFTYPE_STATION: 2797 /* we already did checks when looking up the RA STA */ 2798 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2799 2800 if (tdls_peer) { 2801 /* For TDLS only one link can be valid with peer STA */ 2802 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2803 struct ieee80211_link_data *link; 2804 2805 /* DA SA BSSID */ 2806 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2807 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2808 link = rcu_dereference(sdata->link[tdls_link_id]); 2809 if (WARN_ON_ONCE(!link)) { 2810 ret = -EINVAL; 2811 goto free; 2812 } 2813 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2814 hdrlen = 24; 2815 } else if (sdata->u.mgd.use_4addr && 2816 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2817 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2818 IEEE80211_FCTL_TODS); 2819 /* RA TA DA SA */ 2820 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2821 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2822 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2823 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2824 hdrlen = 30; 2825 } else { 2826 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2827 /* BSSID SA DA */ 2828 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2829 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2830 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2831 hdrlen = 24; 2832 } 2833 break; 2834 case NL80211_IFTYPE_OCB: 2835 /* DA SA BSSID */ 2836 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2837 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2838 eth_broadcast_addr(hdr.addr3); 2839 hdrlen = 24; 2840 break; 2841 case NL80211_IFTYPE_ADHOC: 2842 /* DA SA BSSID */ 2843 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2844 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2845 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2846 hdrlen = 24; 2847 break; 2848 case NL80211_IFTYPE_NAN_DATA: { 2849 struct ieee80211_sub_if_data *nmi; 2850 2851 /* DA SA Cluster ID */ 2852 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2853 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2854 nmi = rcu_dereference(sdata->u.nan_data.nmi); 2855 if (!nmi) { 2856 ret = -ENOTCONN; 2857 goto free; 2858 } 2859 memcpy(hdr.addr3, nmi->wdev.u.nan.cluster_id, ETH_ALEN); 2860 hdrlen = 24; 2861 break; 2862 } 2863 default: 2864 ret = -EINVAL; 2865 goto free; 2866 } 2867 2868 if (!chanctx_conf) { 2869 if (sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 2870 /* NAN operates on multiple bands */ 2871 band = NUM_NL80211_BANDS; 2872 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 2873 ret = -ENOTCONN; 2874 goto free; 2875 } else { 2876 /* MLD transmissions must not rely on the band */ 2877 band = 0; 2878 } 2879 } else { 2880 band = chanctx_conf->def.chan->band; 2881 } 2882 2883 multicast = is_multicast_ether_addr(hdr.addr1); 2884 2885 /* sta is always NULL for mesh */ 2886 if (sta) { 2887 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2888 wme_sta = sta->sta.wme; 2889 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2890 /* For mesh, the use of the QoS header is mandatory */ 2891 wme_sta = true; 2892 } 2893 2894 /* receiver does QoS (which also means we do) use it */ 2895 if (wme_sta) { 2896 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2897 hdrlen += 2; 2898 } 2899 2900 /* 2901 * Drop unicast frames to unauthorised stations unless they are 2902 * EAPOL frames from the local station. 2903 */ 2904 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2905 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2906 !multicast && !authorized && 2907 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2908 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2909 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2910 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2911 sdata->name, hdr.addr1); 2912 #endif 2913 2914 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2915 2916 ret = -EPERM; 2917 goto free; 2918 } 2919 2920 if (unlikely(!multicast && 2921 (sk_requests_wifi_status(skb->sk) || 2922 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2923 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2924 cookie); 2925 2926 /* 2927 * If the skb is shared we need to obtain our own copy. 2928 */ 2929 skb = skb_share_check(skb, GFP_ATOMIC); 2930 if (unlikely(!skb)) { 2931 ret = -ENOMEM; 2932 goto free; 2933 } 2934 2935 hdr.frame_control = fc; 2936 hdr.duration_id = 0; 2937 hdr.seq_ctrl = 0; 2938 2939 skip_header_bytes = ETH_HLEN; 2940 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2941 encaps_data = bridge_tunnel_header; 2942 encaps_len = sizeof(bridge_tunnel_header); 2943 skip_header_bytes -= 2; 2944 } else if (ethertype >= ETH_P_802_3_MIN) { 2945 encaps_data = rfc1042_header; 2946 encaps_len = sizeof(rfc1042_header); 2947 skip_header_bytes -= 2; 2948 } else { 2949 encaps_data = NULL; 2950 encaps_len = 0; 2951 } 2952 2953 skb_pull(skb, skip_header_bytes); 2954 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2955 2956 /* 2957 * So we need to modify the skb header and hence need a copy of 2958 * that. The head_need variable above doesn't, so far, include 2959 * the needed header space that we don't need right away. If we 2960 * can, then we don't reallocate right now but only after the 2961 * frame arrives at the master device (if it does...) 2962 * 2963 * If we cannot, however, then we will reallocate to include all 2964 * the ever needed space. Also, if we need to reallocate it anyway, 2965 * make it big enough for everything we may ever need. 2966 */ 2967 2968 if (head_need > 0 || skb_cloned(skb)) { 2969 head_need += IEEE80211_ENCRYPT_HEADROOM; 2970 head_need += local->tx_headroom; 2971 head_need = max_t(int, 0, head_need); 2972 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2973 ieee80211_free_txskb(&local->hw, skb); 2974 skb = NULL; 2975 return ERR_PTR(-ENOMEM); 2976 } 2977 } 2978 2979 if (encaps_data) 2980 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2981 2982 #ifdef CONFIG_MAC80211_MESH 2983 if (meshhdrlen > 0) 2984 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2985 #endif 2986 2987 if (ieee80211_is_data_qos(fc)) { 2988 __le16 *qos_control; 2989 2990 qos_control = skb_push(skb, 2); 2991 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2992 /* 2993 * Maybe we could actually set some fields here, for now just 2994 * initialise to zero to indicate no special operation. 2995 */ 2996 *qos_control = 0; 2997 } else 2998 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2999 3000 skb_reset_mac_header(skb); 3001 3002 info = IEEE80211_SKB_CB(skb); 3003 memset(info, 0, sizeof(*info)); 3004 3005 info->flags = info_flags; 3006 if (info_id) { 3007 info->status_data = info_id; 3008 info->status_data_idr = 1; 3009 } 3010 info->band = band; 3011 3012 if (likely(!cookie)) { 3013 ctrl_flags |= u32_encode_bits(link_id, 3014 IEEE80211_TX_CTRL_MLO_LINK); 3015 } else { 3016 unsigned int pre_conf_link_id; 3017 3018 /* 3019 * ctrl_flags already have been set by 3020 * ieee80211_tx_control_port(), here 3021 * we just sanity check that 3022 */ 3023 3024 pre_conf_link_id = u32_get_bits(ctrl_flags, 3025 IEEE80211_TX_CTRL_MLO_LINK); 3026 3027 if (pre_conf_link_id != link_id && 3028 link_id != IEEE80211_LINK_UNSPECIFIED) { 3029 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 3030 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 3031 sdata->name, hdr.addr1, 3032 pre_conf_link_id, link_id); 3033 #endif 3034 ret = -EINVAL; 3035 goto free; 3036 } 3037 } 3038 3039 info->control.flags = ctrl_flags; 3040 3041 return skb; 3042 free: 3043 kfree_skb(skb); 3044 return ERR_PTR(ret); 3045 } 3046 3047 /* 3048 * fast-xmit overview 3049 * 3050 * The core idea of this fast-xmit is to remove per-packet checks by checking 3051 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3052 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3053 * much less work can be done per packet. For example, fragmentation must be 3054 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3055 * in the code here. 3056 * 3057 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3058 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3059 * 3060 * The most difficult part of this is that when any of these assumptions 3061 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3062 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3063 * since the per-packet code no longer checks the conditions. This is reflected 3064 * by the calls to these functions throughout the rest of the code, and must be 3065 * maintained if any of the TX path checks change. 3066 */ 3067 3068 void ieee80211_check_fast_xmit(struct sta_info *sta) 3069 { 3070 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3071 struct ieee80211_local *local = sta->local; 3072 struct ieee80211_sub_if_data *sdata = sta->sdata; 3073 struct ieee80211_hdr *hdr = (void *)build.hdr; 3074 struct ieee80211_chanctx_conf *chanctx_conf; 3075 __le16 fc; 3076 3077 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3078 return; 3079 3080 if (ieee80211_vif_is_mesh(&sdata->vif)) 3081 mesh_fast_tx_flush_sta(sdata, sta); 3082 3083 /* Locking here protects both the pointer itself, and against concurrent 3084 * invocations winning data access races to, e.g., the key pointer that 3085 * is used. 3086 * Without it, the invocation of this function right after the key 3087 * pointer changes wouldn't be sufficient, as another CPU could access 3088 * the pointer, then stall, and then do the cache update after the CPU 3089 * that invalidated the key. 3090 * With the locking, such scenarios cannot happen as the check for the 3091 * key and the fast-tx assignment are done atomically, so the CPU that 3092 * modifies the key will either wait or other one will see the key 3093 * cleared/changed already. 3094 */ 3095 spin_lock_bh(&sta->lock); 3096 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3097 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3098 sdata->vif.type == NL80211_IFTYPE_STATION) 3099 goto out; 3100 3101 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3102 goto out; 3103 3104 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3105 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3106 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3107 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3108 goto out; 3109 3110 if (sdata->noack_map) 3111 goto out; 3112 3113 /* fast-xmit doesn't handle fragmentation at all */ 3114 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3115 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3116 goto out; 3117 3118 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3119 rcu_read_lock(); 3120 chanctx_conf = 3121 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3122 if (!chanctx_conf) { 3123 rcu_read_unlock(); 3124 goto out; 3125 } 3126 build.band = chanctx_conf->def.chan->band; 3127 rcu_read_unlock(); 3128 } else { 3129 /* MLD transmissions must not rely on the band */ 3130 build.band = 0; 3131 } 3132 3133 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3134 3135 switch (sdata->vif.type) { 3136 case NL80211_IFTYPE_ADHOC: 3137 /* DA SA BSSID */ 3138 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3139 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3140 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3141 build.hdr_len = 24; 3142 break; 3143 case NL80211_IFTYPE_STATION: 3144 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3145 /* For TDLS only one link can be valid with peer STA */ 3146 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3147 struct ieee80211_link_data *link; 3148 3149 /* DA SA BSSID */ 3150 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3151 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3152 rcu_read_lock(); 3153 link = rcu_dereference(sdata->link[tdls_link_id]); 3154 if (!WARN_ON_ONCE(!link)) 3155 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3156 rcu_read_unlock(); 3157 build.hdr_len = 24; 3158 break; 3159 } 3160 3161 if (sdata->u.mgd.use_4addr) { 3162 /* non-regular ethertype cannot use the fastpath */ 3163 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3164 IEEE80211_FCTL_TODS); 3165 /* RA TA DA SA */ 3166 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3167 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3168 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3169 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3170 build.hdr_len = 30; 3171 break; 3172 } 3173 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3174 /* BSSID SA DA */ 3175 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3176 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3177 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3178 build.hdr_len = 24; 3179 break; 3180 case NL80211_IFTYPE_AP_VLAN: 3181 if (sdata->wdev.use_4addr) { 3182 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3183 IEEE80211_FCTL_TODS); 3184 /* RA TA DA SA */ 3185 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3186 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3187 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3188 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3189 build.hdr_len = 30; 3190 break; 3191 } 3192 fallthrough; 3193 case NL80211_IFTYPE_AP: 3194 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3195 /* DA BSSID SA */ 3196 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3197 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3198 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3199 } else { 3200 unsigned int link_id = sta->deflink.link_id; 3201 struct ieee80211_link_data *link; 3202 3203 rcu_read_lock(); 3204 link = rcu_dereference(sdata->link[link_id]); 3205 if (WARN_ON(!link)) { 3206 rcu_read_unlock(); 3207 goto out; 3208 } 3209 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3210 rcu_read_unlock(); 3211 } 3212 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3213 build.hdr_len = 24; 3214 break; 3215 default: 3216 /* not handled on fast-xmit */ 3217 goto out; 3218 } 3219 3220 if (sta->sta.wme) { 3221 build.hdr_len += 2; 3222 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3223 } 3224 3225 /* We store the key here so there's no point in using rcu_dereference() 3226 * but that's fine because the code that changes the pointers will call 3227 * this function after doing so. For a single CPU that would be enough, 3228 * for multiple see the comment above. 3229 */ 3230 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3231 if (!build.key) 3232 build.key = rcu_access_pointer(sdata->default_unicast_key); 3233 if (build.key) { 3234 bool gen_iv, iv_spc, mmic; 3235 3236 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3237 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3238 mmic = build.key->conf.flags & 3239 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3240 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3241 3242 /* don't handle software crypto */ 3243 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3244 goto out; 3245 3246 /* Key is being removed */ 3247 if (build.key->flags & KEY_FLAG_TAINTED) 3248 goto out; 3249 3250 switch (build.key->conf.cipher) { 3251 case WLAN_CIPHER_SUITE_CCMP: 3252 case WLAN_CIPHER_SUITE_CCMP_256: 3253 if (gen_iv) 3254 build.pn_offs = build.hdr_len; 3255 if (gen_iv || iv_spc) 3256 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3257 break; 3258 case WLAN_CIPHER_SUITE_GCMP: 3259 case WLAN_CIPHER_SUITE_GCMP_256: 3260 if (gen_iv) 3261 build.pn_offs = build.hdr_len; 3262 if (gen_iv || iv_spc) 3263 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3264 break; 3265 case WLAN_CIPHER_SUITE_TKIP: 3266 /* cannot handle MMIC or IV generation in xmit-fast */ 3267 if (mmic || gen_iv) 3268 goto out; 3269 if (iv_spc) 3270 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3271 break; 3272 case WLAN_CIPHER_SUITE_WEP40: 3273 case WLAN_CIPHER_SUITE_WEP104: 3274 /* cannot handle IV generation in fast-xmit */ 3275 if (gen_iv) 3276 goto out; 3277 if (iv_spc) 3278 build.hdr_len += IEEE80211_WEP_IV_LEN; 3279 break; 3280 case WLAN_CIPHER_SUITE_AES_CMAC: 3281 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3282 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3283 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3284 WARN(1, 3285 "management cipher suite 0x%x enabled for data\n", 3286 build.key->conf.cipher); 3287 goto out; 3288 default: 3289 /* we don't know how to generate IVs for this at all */ 3290 if (WARN_ON(gen_iv)) 3291 goto out; 3292 } 3293 3294 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3295 } 3296 3297 hdr->frame_control = fc; 3298 3299 memcpy(build.hdr + build.hdr_len, 3300 rfc1042_header, sizeof(rfc1042_header)); 3301 build.hdr_len += sizeof(rfc1042_header); 3302 3303 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3304 /* if the kmemdup fails, continue w/o fast_tx */ 3305 3306 out: 3307 /* we might have raced against another call to this function */ 3308 old = rcu_dereference_protected(sta->fast_tx, 3309 lockdep_is_held(&sta->lock)); 3310 rcu_assign_pointer(sta->fast_tx, fast_tx); 3311 if (old) 3312 kfree_rcu(old, rcu_head); 3313 spin_unlock_bh(&sta->lock); 3314 } 3315 3316 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3317 { 3318 struct sta_info *sta; 3319 3320 rcu_read_lock(); 3321 list_for_each_entry_rcu(sta, &local->sta_list, list) 3322 ieee80211_check_fast_xmit(sta); 3323 rcu_read_unlock(); 3324 } 3325 3326 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3327 { 3328 struct ieee80211_local *local = sdata->local; 3329 struct sta_info *sta; 3330 3331 rcu_read_lock(); 3332 3333 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3334 if (sdata != sta->sdata && 3335 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3336 continue; 3337 ieee80211_check_fast_xmit(sta); 3338 } 3339 3340 rcu_read_unlock(); 3341 } 3342 3343 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3344 { 3345 struct ieee80211_fast_tx *fast_tx; 3346 3347 spin_lock_bh(&sta->lock); 3348 fast_tx = rcu_dereference_protected(sta->fast_tx, 3349 lockdep_is_held(&sta->lock)); 3350 RCU_INIT_POINTER(sta->fast_tx, NULL); 3351 spin_unlock_bh(&sta->lock); 3352 3353 if (fast_tx) 3354 kfree_rcu(fast_tx, rcu_head); 3355 } 3356 3357 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3358 struct sk_buff *skb, int headroom) 3359 { 3360 if (skb_headroom(skb) < headroom) { 3361 I802_DEBUG_INC(local->tx_expand_skb_head); 3362 3363 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3364 wiphy_debug(local->hw.wiphy, 3365 "failed to reallocate TX buffer\n"); 3366 return false; 3367 } 3368 } 3369 3370 return true; 3371 } 3372 3373 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3374 struct ieee80211_fast_tx *fast_tx, 3375 struct sk_buff *skb) 3376 { 3377 struct ieee80211_local *local = sdata->local; 3378 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3379 struct ieee80211_hdr *hdr; 3380 struct ethhdr *amsdu_hdr; 3381 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3382 int subframe_len = skb->len - hdr_len; 3383 void *data; 3384 u8 *qc, *h_80211_src, *h_80211_dst; 3385 const u8 *bssid; 3386 3387 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3388 return false; 3389 3390 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3391 return true; 3392 3393 if (!ieee80211_amsdu_realloc_pad(local, skb, 3394 sizeof(*amsdu_hdr) + 3395 local->hw.extra_tx_headroom)) 3396 return false; 3397 3398 data = skb_push(skb, sizeof(*amsdu_hdr)); 3399 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3400 hdr = data; 3401 amsdu_hdr = data + hdr_len; 3402 /* h_80211_src/dst is addr* field within hdr */ 3403 h_80211_src = data + fast_tx->sa_offs; 3404 h_80211_dst = data + fast_tx->da_offs; 3405 3406 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3407 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3408 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3409 3410 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3411 * fields needs to be changed to BSSID for A-MSDU frames depending 3412 * on FromDS/ToDS values. 3413 */ 3414 switch (sdata->vif.type) { 3415 case NL80211_IFTYPE_STATION: 3416 bssid = sdata->vif.cfg.ap_addr; 3417 break; 3418 case NL80211_IFTYPE_AP: 3419 case NL80211_IFTYPE_AP_VLAN: 3420 bssid = sdata->vif.addr; 3421 break; 3422 default: 3423 bssid = NULL; 3424 } 3425 3426 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3427 ether_addr_copy(h_80211_src, bssid); 3428 3429 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3430 ether_addr_copy(h_80211_dst, bssid); 3431 3432 qc = ieee80211_get_qos_ctl(hdr); 3433 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3434 3435 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3436 3437 return true; 3438 } 3439 3440 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3441 struct sta_info *sta, 3442 struct ieee80211_fast_tx *fast_tx, 3443 struct sk_buff *skb, 3444 const u8 *da, const u8 *sa) 3445 { 3446 struct ieee80211_local *local = sdata->local; 3447 struct fq *fq = &local->fq; 3448 struct fq_tin *tin; 3449 struct fq_flow *flow; 3450 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3451 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3452 struct txq_info *txqi; 3453 struct sk_buff **frag_tail, *head; 3454 int subframe_len = skb->len - ETH_ALEN; 3455 u8 max_subframes = sta->sta.max_amsdu_subframes; 3456 int max_frags = local->hw.max_tx_fragments; 3457 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3458 int orig_truesize; 3459 u32 flow_idx; 3460 __be16 len; 3461 void *data; 3462 bool ret = false; 3463 unsigned int orig_len; 3464 int n = 2, nfrags, pad = 0; 3465 u16 hdrlen; 3466 3467 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3468 return false; 3469 3470 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3471 return false; 3472 3473 if (ieee80211_vif_is_mesh(&sdata->vif)) 3474 return false; 3475 3476 if (skb_is_gso(skb)) 3477 return false; 3478 3479 if (!txq) 3480 return false; 3481 3482 txqi = to_txq_info(txq); 3483 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3484 return false; 3485 3486 if (sta->sta.cur->max_rc_amsdu_len) 3487 max_amsdu_len = min_t(int, max_amsdu_len, 3488 sta->sta.cur->max_rc_amsdu_len); 3489 3490 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3491 max_amsdu_len = min_t(int, max_amsdu_len, 3492 sta->sta.cur->max_tid_amsdu_len[tid]); 3493 3494 flow_idx = fq_flow_idx(fq, skb); 3495 3496 spin_lock_bh(&fq->lock); 3497 3498 /* TODO: Ideally aggregation should be done on dequeue to remain 3499 * responsive to environment changes. 3500 */ 3501 3502 tin = &txqi->tin; 3503 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3504 head = skb_peek_tail(&flow->queue); 3505 if (!head || skb_is_gso(head)) 3506 goto out; 3507 3508 orig_truesize = head->truesize; 3509 orig_len = head->len; 3510 3511 if (skb->len + head->len > max_amsdu_len) 3512 goto out; 3513 3514 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3515 nfrags += 1 + skb_shinfo(head)->nr_frags; 3516 frag_tail = &skb_shinfo(head)->frag_list; 3517 while (*frag_tail) { 3518 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3519 frag_tail = &(*frag_tail)->next; 3520 n++; 3521 } 3522 3523 if (max_subframes && n > max_subframes) 3524 goto out; 3525 3526 if (max_frags && nfrags > max_frags) 3527 goto out; 3528 3529 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3530 goto out; 3531 3532 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3533 goto out; 3534 3535 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3536 * and frag_tail should be &skb_shinfo(head)->frag_list. 3537 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3538 * Reload frag_tail to have it pointing to the correct place. 3539 */ 3540 if (n == 2) 3541 frag_tail = &skb_shinfo(head)->frag_list; 3542 3543 /* 3544 * Pad out the previous subframe to a multiple of 4 by adding the 3545 * padding to the next one, that's being added. Note that head->len 3546 * is the length of the full A-MSDU, but that works since each time 3547 * we add a new subframe we pad out the previous one to a multiple 3548 * of 4 and thus it no longer matters in the next round. 3549 */ 3550 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3551 if ((head->len - hdrlen) & 3) 3552 pad = 4 - ((head->len - hdrlen) & 3); 3553 3554 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3555 2 + pad)) 3556 goto out_recalc; 3557 3558 ret = true; 3559 data = skb_push(skb, ETH_ALEN + 2); 3560 ether_addr_copy(data, da); 3561 ether_addr_copy(data + ETH_ALEN, sa); 3562 3563 data += 2 * ETH_ALEN; 3564 len = cpu_to_be16(subframe_len); 3565 memcpy(data, &len, 2); 3566 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3567 3568 memset(skb_push(skb, pad), 0, pad); 3569 3570 head->len += skb->len; 3571 head->data_len += skb->len; 3572 *frag_tail = skb; 3573 3574 out_recalc: 3575 fq->memory_usage += head->truesize - orig_truesize; 3576 if (head->len != orig_len) { 3577 flow->backlog += head->len - orig_len; 3578 tin->backlog_bytes += head->len - orig_len; 3579 } 3580 out: 3581 spin_unlock_bh(&fq->lock); 3582 3583 return ret; 3584 } 3585 3586 /* 3587 * Can be called while the sta lock is held. Anything that can cause packets to 3588 * be generated will cause deadlock! 3589 */ 3590 static ieee80211_tx_result 3591 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3592 struct sta_info *sta, u8 pn_offs, 3593 struct ieee80211_key *key, 3594 struct ieee80211_tx_data *tx) 3595 { 3596 struct sk_buff *skb = tx->skb; 3597 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3598 struct ieee80211_hdr *hdr = (void *)skb->data; 3599 u8 tid = IEEE80211_NUM_TIDS; 3600 3601 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3602 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3603 return TX_DROP; 3604 3605 if (key) 3606 info->control.hw_key = &key->conf; 3607 3608 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3609 3610 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3611 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3612 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3613 } else { 3614 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3615 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3616 sdata->sequence_number += 0x10; 3617 } 3618 3619 if (skb_shinfo(skb)->gso_size) 3620 sta->deflink.tx_stats.msdu[tid] += 3621 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3622 else 3623 sta->deflink.tx_stats.msdu[tid]++; 3624 3625 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3626 3627 /* statistics normally done by ieee80211_tx_h_stats (but that 3628 * has to consider fragmentation, so is more complex) 3629 */ 3630 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3631 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3632 3633 if (pn_offs) { 3634 u64 pn; 3635 u8 *crypto_hdr = skb->data + pn_offs; 3636 3637 switch (key->conf.cipher) { 3638 case WLAN_CIPHER_SUITE_CCMP: 3639 case WLAN_CIPHER_SUITE_CCMP_256: 3640 case WLAN_CIPHER_SUITE_GCMP: 3641 case WLAN_CIPHER_SUITE_GCMP_256: 3642 pn = atomic64_inc_return(&key->conf.tx_pn); 3643 crypto_hdr[0] = pn; 3644 crypto_hdr[1] = pn >> 8; 3645 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3646 crypto_hdr[4] = pn >> 16; 3647 crypto_hdr[5] = pn >> 24; 3648 crypto_hdr[6] = pn >> 32; 3649 crypto_hdr[7] = pn >> 40; 3650 break; 3651 } 3652 } 3653 3654 return TX_CONTINUE; 3655 } 3656 3657 static netdev_features_t 3658 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3659 { 3660 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3661 return sdata->vif.netdev_features; 3662 3663 if (!sdata->bss) 3664 return 0; 3665 3666 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3667 return sdata->vif.netdev_features; 3668 } 3669 3670 static struct sk_buff * 3671 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3672 { 3673 if (skb_is_gso(skb)) { 3674 struct sk_buff *segs; 3675 3676 segs = skb_gso_segment(skb, features); 3677 if (!segs) 3678 return skb; 3679 if (IS_ERR(segs)) 3680 goto free; 3681 3682 consume_skb(skb); 3683 return segs; 3684 } 3685 3686 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3687 goto free; 3688 3689 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3690 int ofs = skb_checksum_start_offset(skb); 3691 3692 if (skb->encapsulation) 3693 skb_set_inner_transport_header(skb, ofs); 3694 else 3695 skb_set_transport_header(skb, ofs); 3696 3697 if (skb_csum_hwoffload_help(skb, features)) 3698 goto free; 3699 } 3700 3701 skb_mark_not_on_list(skb); 3702 return skb; 3703 3704 free: 3705 kfree_skb(skb); 3706 return NULL; 3707 } 3708 3709 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3710 struct sta_info *sta, 3711 struct ieee80211_fast_tx *fast_tx, 3712 struct sk_buff *skb, bool ampdu, 3713 const u8 *da, const u8 *sa) 3714 { 3715 struct ieee80211_local *local = sdata->local; 3716 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3717 struct ieee80211_tx_info *info; 3718 struct ieee80211_tx_data tx; 3719 ieee80211_tx_result r; 3720 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3721 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3722 3723 skb = skb_share_check(skb, GFP_ATOMIC); 3724 if (unlikely(!skb)) 3725 return; 3726 3727 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3728 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3729 return; 3730 3731 /* will not be crypto-handled beyond what we do here, so use false 3732 * as the may-encrypt argument for the resize to not account for 3733 * more room than we already have in 'extra_head' 3734 */ 3735 if (unlikely(ieee80211_skb_resize(sdata, skb, 3736 max_t(int, extra_head + hw_headroom - 3737 skb_headroom(skb), 0), 3738 ENCRYPT_NO))) 3739 goto free; 3740 3741 hdr = skb_push(skb, extra_head); 3742 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3743 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3744 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3745 3746 info = IEEE80211_SKB_CB(skb); 3747 memset(info, 0, sizeof(*info)); 3748 info->band = fast_tx->band; 3749 info->control.vif = &sdata->vif; 3750 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3751 IEEE80211_TX_CTL_DONTFRAG; 3752 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3753 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3754 IEEE80211_TX_CTRL_MLO_LINK); 3755 3756 #ifdef CONFIG_MAC80211_DEBUGFS 3757 if (local->force_tx_status) 3758 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3759 #endif 3760 3761 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3762 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3763 3764 *ieee80211_get_qos_ctl(hdr) = tid; 3765 } 3766 3767 __skb_queue_head_init(&tx.skbs); 3768 3769 tx.flags = IEEE80211_TX_UNICAST; 3770 tx.local = local; 3771 tx.sdata = sdata; 3772 tx.sta = sta; 3773 tx.key = fast_tx->key; 3774 3775 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3776 return; 3777 3778 tx.skb = skb; 3779 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3780 fast_tx->key, &tx); 3781 tx.skb = NULL; 3782 if (r == TX_DROP) { 3783 tx.sdata->tx_handlers_drop++; 3784 goto free; 3785 } 3786 3787 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3788 sdata = container_of(sdata->bss, 3789 struct ieee80211_sub_if_data, u.ap); 3790 3791 __skb_queue_tail(&tx.skbs, skb); 3792 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3793 return; 3794 3795 free: 3796 kfree_skb(skb); 3797 } 3798 3799 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3800 struct sta_info *sta, 3801 struct ieee80211_fast_tx *fast_tx, 3802 struct sk_buff *skb) 3803 { 3804 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3805 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3806 struct tid_ampdu_tx *tid_tx = NULL; 3807 struct sk_buff *next; 3808 struct ethhdr eth; 3809 u8 tid = IEEE80211_NUM_TIDS; 3810 3811 /* control port protocol needs a lot of special handling */ 3812 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3813 return false; 3814 3815 /* only RFC 1042 SNAP */ 3816 if (ethertype < ETH_P_802_3_MIN) 3817 return false; 3818 3819 /* don't handle TX status request here either */ 3820 if (sk_requests_wifi_status(skb->sk)) 3821 return false; 3822 3823 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3824 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3825 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3826 if (tid_tx) { 3827 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3828 return false; 3829 if (tid_tx->timeout) 3830 tid_tx->last_tx = jiffies; 3831 } 3832 } 3833 3834 memcpy(ð, skb->data, ETH_HLEN - 2); 3835 3836 /* after this point (skb is modified) we cannot return false */ 3837 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3838 if (!skb) 3839 return true; 3840 3841 skb_list_walk_safe(skb, skb, next) { 3842 skb_mark_not_on_list(skb); 3843 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3844 eth.h_dest, eth.h_source); 3845 } 3846 3847 return true; 3848 } 3849 3850 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3851 struct ieee80211_txq *txq) 3852 { 3853 struct ieee80211_local *local = hw_to_local(hw); 3854 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3855 struct ieee80211_hdr *hdr; 3856 struct sk_buff *skb = NULL; 3857 struct fq *fq = &local->fq; 3858 struct fq_tin *tin = &txqi->tin; 3859 struct ieee80211_tx_info *info; 3860 struct ieee80211_tx_data tx; 3861 ieee80211_tx_result r; 3862 struct ieee80211_vif *vif = txq->vif; 3863 int q = vif->hw_queue[txq->ac]; 3864 unsigned long flags; 3865 bool q_stopped; 3866 3867 WARN_ON_ONCE(softirq_count() == 0); 3868 3869 if (!ieee80211_txq_airtime_check(hw, txq)) 3870 return NULL; 3871 3872 begin: 3873 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3874 q_stopped = local->queue_stop_reasons[q]; 3875 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3876 3877 if (unlikely(q_stopped)) { 3878 /* mark for waking later */ 3879 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3880 return NULL; 3881 } 3882 3883 spin_lock_bh(&fq->lock); 3884 3885 /* Make sure fragments stay together. */ 3886 skb = __skb_dequeue(&txqi->frags); 3887 if (unlikely(skb)) { 3888 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3889 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3890 goto out; 3891 IEEE80211_SKB_CB(skb)->control.flags &= 3892 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3893 } else { 3894 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3895 goto out; 3896 3897 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3898 } 3899 3900 if (!skb) 3901 goto out; 3902 3903 spin_unlock_bh(&fq->lock); 3904 3905 hdr = (struct ieee80211_hdr *)skb->data; 3906 info = IEEE80211_SKB_CB(skb); 3907 3908 memset(&tx, 0, sizeof(tx)); 3909 __skb_queue_head_init(&tx.skbs); 3910 tx.local = local; 3911 tx.skb = skb; 3912 tx.sdata = vif_to_sdata(info->control.vif); 3913 3914 if (txq->sta) { 3915 tx.sta = container_of(txq->sta, struct sta_info, sta); 3916 /* 3917 * Drop unicast frames to unauthorised stations unless they are 3918 * injected frames or EAPOL frames from the local station. 3919 */ 3920 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3921 ieee80211_is_data(hdr->frame_control) && 3922 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3923 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3924 !is_multicast_ether_addr(hdr->addr1) && 3925 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3926 (!(info->control.flags & 3927 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3928 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3929 NULL)))) { 3930 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3931 ieee80211_free_txskb(&local->hw, skb); 3932 goto begin; 3933 } 3934 } 3935 3936 /* 3937 * The key can be removed while the packet was queued, so need to call 3938 * this here to get the current key. 3939 */ 3940 info->control.hw_key = NULL; 3941 r = ieee80211_tx_h_select_key(&tx); 3942 if (r != TX_CONTINUE) { 3943 ieee80211_free_txskb(&local->hw, skb); 3944 goto begin; 3945 } 3946 3947 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3948 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3949 IEEE80211_TX_CTL_DONTFRAG); 3950 3951 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3952 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3953 r = ieee80211_tx_h_rate_ctrl(&tx); 3954 if (r != TX_CONTINUE) { 3955 ieee80211_free_txskb(&local->hw, skb); 3956 goto begin; 3957 } 3958 } 3959 goto encap_out; 3960 } 3961 3962 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3963 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3964 sta); 3965 u8 pn_offs = 0; 3966 3967 if (tx.key && 3968 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3969 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3970 3971 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3972 tx.key, &tx); 3973 if (r != TX_CONTINUE) { 3974 ieee80211_free_txskb(&local->hw, skb); 3975 goto begin; 3976 } 3977 } else { 3978 if (invoke_tx_handlers_late(&tx)) 3979 goto begin; 3980 3981 skb = __skb_dequeue(&tx.skbs); 3982 info = IEEE80211_SKB_CB(skb); 3983 3984 if (!skb_queue_empty(&tx.skbs)) { 3985 spin_lock_bh(&fq->lock); 3986 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3987 spin_unlock_bh(&fq->lock); 3988 } 3989 } 3990 3991 if (skb_has_frag_list(skb) && 3992 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3993 if (skb_linearize(skb)) { 3994 ieee80211_free_txskb(&local->hw, skb); 3995 goto begin; 3996 } 3997 } 3998 3999 switch (tx.sdata->vif.type) { 4000 case NL80211_IFTYPE_MONITOR: 4001 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 4002 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 4003 vif = &tx.sdata->vif; 4004 break; 4005 } 4006 tx.sdata = rcu_dereference(local->monitor_sdata); 4007 if (tx.sdata && 4008 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 4009 vif = &tx.sdata->vif; 4010 info->hw_queue = 4011 vif->hw_queue[skb_get_queue_mapping(skb)]; 4012 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 4013 ieee80211_free_txskb(&local->hw, skb); 4014 goto begin; 4015 } else { 4016 info->control.vif = NULL; 4017 return skb; 4018 } 4019 break; 4020 case NL80211_IFTYPE_AP_VLAN: 4021 tx.sdata = container_of(tx.sdata->bss, 4022 struct ieee80211_sub_if_data, u.ap); 4023 fallthrough; 4024 default: 4025 vif = &tx.sdata->vif; 4026 break; 4027 } 4028 4029 encap_out: 4030 info->control.vif = vif; 4031 4032 if (tx.sta && 4033 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 4034 bool ampdu = txq->ac != IEEE80211_AC_VO; 4035 u32 airtime; 4036 4037 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 4038 skb->len, ampdu); 4039 if (airtime) { 4040 airtime = ieee80211_info_set_tx_time_est(info, airtime); 4041 ieee80211_sta_update_pending_airtime(local, tx.sta, 4042 txq->ac, 4043 airtime, 4044 false); 4045 } 4046 } 4047 4048 return skb; 4049 4050 out: 4051 spin_unlock_bh(&fq->lock); 4052 4053 return skb; 4054 } 4055 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4056 4057 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4058 { 4059 struct airtime_info *air_info = &sta->airtime[ac]; 4060 4061 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4062 } 4063 4064 static void 4065 ieee80211_txq_set_active(struct txq_info *txqi) 4066 { 4067 struct sta_info *sta; 4068 4069 if (!txqi->txq.sta) 4070 return; 4071 4072 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4073 sta->airtime[txqi->txq.ac].last_active = jiffies; 4074 } 4075 4076 static bool 4077 ieee80211_txq_keep_active(struct txq_info *txqi) 4078 { 4079 struct sta_info *sta; 4080 4081 if (!txqi->txq.sta) 4082 return false; 4083 4084 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4085 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4086 return false; 4087 4088 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4089 } 4090 4091 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4092 { 4093 struct ieee80211_local *local = hw_to_local(hw); 4094 struct ieee80211_txq *ret = NULL; 4095 struct txq_info *txqi = NULL, *head = NULL; 4096 bool found_eligible_txq = false; 4097 4098 spin_lock_bh(&local->active_txq_lock[ac]); 4099 4100 if (!local->schedule_round[ac]) 4101 goto out; 4102 4103 begin: 4104 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4105 struct txq_info, 4106 schedule_order); 4107 if (!txqi) 4108 goto out; 4109 4110 if (txqi == head) { 4111 if (!found_eligible_txq) 4112 goto out; 4113 else 4114 found_eligible_txq = false; 4115 } 4116 4117 if (!head) 4118 head = txqi; 4119 4120 if (txqi->txq.sta) { 4121 struct sta_info *sta = container_of(txqi->txq.sta, 4122 struct sta_info, sta); 4123 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4124 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4125 4126 if (aql_check) 4127 found_eligible_txq = true; 4128 4129 if (deficit < 0) 4130 sta->airtime[txqi->txq.ac].deficit += 4131 sta->airtime_weight; 4132 4133 if (deficit < 0 || !aql_check) { 4134 list_move_tail(&txqi->schedule_order, 4135 &local->active_txqs[txqi->txq.ac]); 4136 goto begin; 4137 } 4138 } 4139 4140 if (txqi->schedule_round == local->schedule_round[ac]) 4141 goto out; 4142 4143 list_del_init(&txqi->schedule_order); 4144 txqi->schedule_round = local->schedule_round[ac]; 4145 ret = &txqi->txq; 4146 4147 out: 4148 spin_unlock_bh(&local->active_txq_lock[ac]); 4149 return ret; 4150 } 4151 EXPORT_SYMBOL(ieee80211_next_txq); 4152 4153 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4154 struct ieee80211_txq *txq, 4155 bool force) 4156 { 4157 struct ieee80211_local *local = hw_to_local(hw); 4158 struct txq_info *txqi = to_txq_info(txq); 4159 bool has_queue; 4160 4161 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4162 4163 has_queue = force || 4164 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4165 txq_has_queue(txq)); 4166 if (list_empty(&txqi->schedule_order) && 4167 (has_queue || ieee80211_txq_keep_active(txqi))) { 4168 /* If airtime accounting is active, always enqueue STAs at the 4169 * head of the list to ensure that they only get moved to the 4170 * back by the airtime DRR scheduler once they have a negative 4171 * deficit. A station that already has a negative deficit will 4172 * get immediately moved to the back of the list on the next 4173 * call to ieee80211_next_txq(). 4174 */ 4175 if (txqi->txq.sta && local->airtime_flags && has_queue && 4176 wiphy_ext_feature_isset(local->hw.wiphy, 4177 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4178 list_add(&txqi->schedule_order, 4179 &local->active_txqs[txq->ac]); 4180 else 4181 list_add_tail(&txqi->schedule_order, 4182 &local->active_txqs[txq->ac]); 4183 if (has_queue) 4184 ieee80211_txq_set_active(txqi); 4185 } 4186 4187 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4188 } 4189 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4190 4191 DEFINE_STATIC_KEY_FALSE(aql_disable); 4192 4193 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4194 struct ieee80211_txq *txq) 4195 { 4196 struct sta_info *sta; 4197 struct ieee80211_local *local = hw_to_local(hw); 4198 4199 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4200 return true; 4201 4202 if (static_branch_unlikely(&aql_disable)) 4203 return true; 4204 4205 if (!txq->sta) 4206 return true; 4207 4208 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4209 return true; 4210 4211 sta = container_of(txq->sta, struct sta_info, sta); 4212 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4213 sta->airtime[txq->ac].aql_limit_low) 4214 return true; 4215 4216 if (atomic_read(&local->aql_total_pending_airtime) < 4217 local->aql_threshold && 4218 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4219 sta->airtime[txq->ac].aql_limit_high) 4220 return true; 4221 4222 return false; 4223 } 4224 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4225 4226 static bool 4227 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4228 { 4229 unsigned int num_txq = 0; 4230 struct txq_info *txq; 4231 u32 aql_limit; 4232 4233 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4234 return true; 4235 4236 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4237 num_txq++; 4238 4239 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4240 local->aql_txq_limit_high[ac]; 4241 4242 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4243 } 4244 4245 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4246 struct ieee80211_txq *txq) 4247 { 4248 struct ieee80211_local *local = hw_to_local(hw); 4249 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4250 struct sta_info *sta; 4251 u8 ac = txq->ac; 4252 4253 spin_lock_bh(&local->active_txq_lock[ac]); 4254 4255 if (!txqi->txq.sta) 4256 goto out; 4257 4258 if (list_empty(&txqi->schedule_order)) 4259 goto out; 4260 4261 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4262 goto out; 4263 4264 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4265 schedule_order) { 4266 if (iter == txqi) 4267 break; 4268 4269 if (!iter->txq.sta) { 4270 list_move_tail(&iter->schedule_order, 4271 &local->active_txqs[ac]); 4272 continue; 4273 } 4274 sta = container_of(iter->txq.sta, struct sta_info, sta); 4275 if (ieee80211_sta_deficit(sta, ac) < 0) 4276 sta->airtime[ac].deficit += sta->airtime_weight; 4277 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4278 } 4279 4280 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4281 if (sta->airtime[ac].deficit >= 0) 4282 goto out; 4283 4284 sta->airtime[ac].deficit += sta->airtime_weight; 4285 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4286 spin_unlock_bh(&local->active_txq_lock[ac]); 4287 4288 return false; 4289 out: 4290 if (!list_empty(&txqi->schedule_order)) 4291 list_del_init(&txqi->schedule_order); 4292 spin_unlock_bh(&local->active_txq_lock[ac]); 4293 4294 return true; 4295 } 4296 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4297 4298 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4299 { 4300 struct ieee80211_local *local = hw_to_local(hw); 4301 4302 spin_lock_bh(&local->active_txq_lock[ac]); 4303 4304 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4305 local->schedule_round[ac]++; 4306 if (!local->schedule_round[ac]) 4307 local->schedule_round[ac]++; 4308 } else { 4309 local->schedule_round[ac] = 0; 4310 } 4311 4312 spin_unlock_bh(&local->active_txq_lock[ac]); 4313 } 4314 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4315 4316 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4317 struct net_device *dev, 4318 u32 info_flags, 4319 u32 ctrl_flags, 4320 u64 *cookie) 4321 { 4322 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4323 struct ieee80211_local *local = sdata->local; 4324 struct sta_info *sta; 4325 struct sk_buff *next; 4326 int len = skb->len; 4327 4328 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4329 kfree_skb(skb); 4330 return; 4331 } 4332 4333 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4334 4335 rcu_read_lock(); 4336 4337 if (ieee80211_vif_is_mesh(&sdata->vif) && 4338 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4339 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4340 goto out; 4341 4342 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4343 goto out_free; 4344 4345 if (IS_ERR(sta)) 4346 sta = NULL; 4347 4348 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4349 ieee80211_aggr_check(sdata, sta, skb); 4350 4351 if (sta) { 4352 struct ieee80211_fast_tx *fast_tx; 4353 4354 fast_tx = rcu_dereference(sta->fast_tx); 4355 4356 if (fast_tx && 4357 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4358 goto out; 4359 } 4360 4361 /* the frame could be fragmented, software-encrypted, and other 4362 * things so we cannot really handle checksum or GSO offload. 4363 * fix it up in software before we handle anything else. 4364 */ 4365 skb = ieee80211_tx_skb_fixup(skb, 0); 4366 if (!skb) { 4367 len = 0; 4368 goto out; 4369 } 4370 4371 skb_list_walk_safe(skb, skb, next) { 4372 skb_mark_not_on_list(skb); 4373 4374 if (skb->protocol == sdata->control_port_protocol) 4375 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4376 4377 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4378 sta, ctrl_flags, cookie); 4379 if (IS_ERR(skb)) { 4380 kfree_skb_list(next); 4381 goto out; 4382 } 4383 4384 dev_sw_netstats_tx_add(dev, 1, skb->len); 4385 4386 ieee80211_xmit(sdata, sta, skb); 4387 } 4388 goto out; 4389 out_free: 4390 kfree_skb(skb); 4391 len = 0; 4392 out: 4393 if (len) 4394 ieee80211_tpt_led_trig_tx(local, len); 4395 rcu_read_unlock(); 4396 } 4397 4398 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4399 { 4400 struct ethhdr *eth; 4401 int err; 4402 4403 err = skb_ensure_writable(skb, ETH_HLEN); 4404 if (unlikely(err)) 4405 return err; 4406 4407 eth = (void *)skb->data; 4408 ether_addr_copy(eth->h_dest, sta->sta.addr); 4409 4410 return 0; 4411 } 4412 4413 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4414 struct net_device *dev) 4415 { 4416 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4417 const struct ethhdr *eth = (void *)skb->data; 4418 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4419 __be16 ethertype; 4420 4421 switch (sdata->vif.type) { 4422 case NL80211_IFTYPE_AP_VLAN: 4423 if (sdata->u.vlan.sta) 4424 return false; 4425 if (sdata->wdev.use_4addr) 4426 return false; 4427 fallthrough; 4428 case NL80211_IFTYPE_AP: 4429 /* check runtime toggle for this bss */ 4430 if (!sdata->bss->multicast_to_unicast) 4431 return false; 4432 break; 4433 default: 4434 return false; 4435 } 4436 4437 /* multicast to unicast conversion only for some payload */ 4438 ethertype = eth->h_proto; 4439 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4440 ethertype = ethvlan->h_vlan_encapsulated_proto; 4441 switch (ethertype) { 4442 case htons(ETH_P_ARP): 4443 case htons(ETH_P_IP): 4444 case htons(ETH_P_IPV6): 4445 break; 4446 default: 4447 return false; 4448 } 4449 4450 return true; 4451 } 4452 4453 static void 4454 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4455 struct sk_buff_head *queue) 4456 { 4457 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4458 struct ieee80211_local *local = sdata->local; 4459 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4460 struct sta_info *sta, *first = NULL; 4461 struct sk_buff *cloned_skb; 4462 4463 rcu_read_lock(); 4464 4465 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4466 if (sdata != sta->sdata) 4467 /* AP-VLAN mismatch */ 4468 continue; 4469 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4470 /* do not send back to source */ 4471 continue; 4472 if (!first) { 4473 first = sta; 4474 continue; 4475 } 4476 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4477 if (!cloned_skb) 4478 goto multicast; 4479 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4480 dev_kfree_skb(cloned_skb); 4481 goto multicast; 4482 } 4483 __skb_queue_tail(queue, cloned_skb); 4484 } 4485 4486 if (likely(first)) { 4487 if (unlikely(ieee80211_change_da(skb, first))) 4488 goto multicast; 4489 __skb_queue_tail(queue, skb); 4490 } else { 4491 /* no STA connected, drop */ 4492 kfree_skb(skb); 4493 skb = NULL; 4494 } 4495 4496 goto out; 4497 multicast: 4498 __skb_queue_purge(queue); 4499 __skb_queue_tail(queue, skb); 4500 out: 4501 rcu_read_unlock(); 4502 } 4503 4504 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4505 struct sk_buff *skb, u32 ctrl_flags, 4506 unsigned int link_id) 4507 { 4508 struct sk_buff *out; 4509 4510 out = skb_copy(skb, GFP_ATOMIC); 4511 if (!out) 4512 return; 4513 4514 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4515 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4516 } 4517 4518 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4519 struct sk_buff *skb) 4520 { 4521 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4522 unsigned long links = sdata->vif.active_links; 4523 unsigned int link; 4524 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4525 4526 if (hweight16(links) == 1) { 4527 ctrl_flags |= u32_encode_bits(__ffs(links), 4528 IEEE80211_TX_CTRL_MLO_LINK); 4529 4530 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4531 NULL); 4532 return; 4533 } 4534 4535 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4536 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4537 ctrl_flags = 0; 4538 } 4539 kfree_skb(skb); 4540 } 4541 4542 /** 4543 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4544 * @skb: packet to be sent 4545 * @dev: incoming interface 4546 * 4547 * On failure skb will be freed. 4548 * 4549 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4550 */ 4551 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4552 struct net_device *dev) 4553 { 4554 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4555 const struct ethhdr *eth = (void *)skb->data; 4556 4557 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4558 goto normal; 4559 4560 if (unlikely(!ieee80211_sdata_running(sdata))) { 4561 kfree_skb(skb); 4562 return NETDEV_TX_OK; 4563 } 4564 4565 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4566 struct sk_buff_head queue; 4567 4568 __skb_queue_head_init(&queue); 4569 ieee80211_convert_to_unicast(skb, dev, &queue); 4570 while ((skb = __skb_dequeue(&queue))) 4571 __ieee80211_subif_start_xmit(skb, dev, 0, 4572 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4573 NULL); 4574 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4575 ((sdata->vif.type == NL80211_IFTYPE_AP && 4576 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4577 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4578 !sdata->wdev.use_4addr))) { 4579 ieee80211_mlo_multicast_tx(dev, skb); 4580 } else { 4581 normal: 4582 __ieee80211_subif_start_xmit(skb, dev, 0, 4583 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4584 NULL); 4585 } 4586 4587 return NETDEV_TX_OK; 4588 } 4589 4590 4591 4592 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4593 struct sk_buff *skb, struct sta_info *sta, 4594 bool txpending) 4595 { 4596 struct ieee80211_local *local = sdata->local; 4597 struct ieee80211_tx_control control = {}; 4598 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4599 struct ieee80211_sta *pubsta = NULL; 4600 unsigned long flags; 4601 int q = info->hw_queue; 4602 4603 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4604 4605 if (local->queue_stop_reasons[q] || 4606 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4607 if (txpending) 4608 skb_queue_head(&local->pending[q], skb); 4609 else 4610 skb_queue_tail(&local->pending[q], skb); 4611 4612 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4613 4614 return false; 4615 } 4616 4617 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4618 4619 if (sta && sta->uploaded) 4620 pubsta = &sta->sta; 4621 4622 control.sta = pubsta; 4623 4624 drv_tx(local, &control, skb); 4625 4626 return true; 4627 } 4628 4629 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4630 struct sk_buff *skb, struct sta_info *sta, 4631 bool txpending) 4632 { 4633 struct ieee80211_local *local = sdata->local; 4634 struct sk_buff *next; 4635 bool ret = true; 4636 4637 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4638 return true; 4639 4640 skb_list_walk_safe(skb, skb, next) { 4641 skb_mark_not_on_list(skb); 4642 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4643 ret = false; 4644 } 4645 4646 return ret; 4647 } 4648 4649 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4650 struct net_device *dev, struct sta_info *sta, 4651 struct ieee80211_key *key, struct sk_buff *skb) 4652 { 4653 struct ieee80211_tx_info *info; 4654 struct ieee80211_local *local = sdata->local; 4655 struct tid_ampdu_tx *tid_tx; 4656 struct sk_buff *seg, *next; 4657 unsigned int skbs = 0, len = 0; 4658 u16 queue; 4659 u8 tid; 4660 4661 queue = ieee80211_select_queue(sdata, sta, skb); 4662 skb_set_queue_mapping(skb, queue); 4663 4664 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4665 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4666 goto out_free; 4667 4668 skb = skb_share_check(skb, GFP_ATOMIC); 4669 if (unlikely(!skb)) 4670 return; 4671 4672 ieee80211_aggr_check(sdata, sta, skb); 4673 4674 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4675 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4676 if (tid_tx) { 4677 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4678 /* fall back to non-offload slow path */ 4679 __ieee80211_subif_start_xmit(skb, dev, 0, 4680 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4681 NULL); 4682 return; 4683 } 4684 4685 if (tid_tx->timeout) 4686 tid_tx->last_tx = jiffies; 4687 } 4688 4689 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4690 if (!skb) 4691 return; 4692 4693 info = IEEE80211_SKB_CB(skb); 4694 memset(info, 0, sizeof(*info)); 4695 4696 info->hw_queue = sdata->vif.hw_queue[queue]; 4697 4698 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4699 sdata = container_of(sdata->bss, 4700 struct ieee80211_sub_if_data, u.ap); 4701 4702 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4703 info->control.vif = &sdata->vif; 4704 4705 if (key) 4706 info->control.hw_key = &key->conf; 4707 4708 skb_list_walk_safe(skb, seg, next) { 4709 skbs++; 4710 len += seg->len; 4711 if (seg != skb) 4712 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4713 } 4714 4715 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4716 info->status_data = ieee80211_store_ack_skb(local, skb, 4717 &info->flags, NULL); 4718 if (info->status_data) 4719 info->status_data_idr = 1; 4720 } 4721 4722 dev_sw_netstats_tx_add(dev, skbs, len); 4723 sta->deflink.tx_stats.packets[queue] += skbs; 4724 sta->deflink.tx_stats.bytes[queue] += len; 4725 4726 ieee80211_tpt_led_trig_tx(local, len); 4727 4728 ieee80211_tx_8023(sdata, skb, sta, false); 4729 4730 return; 4731 4732 out_free: 4733 kfree_skb(skb); 4734 } 4735 4736 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4737 struct net_device *dev) 4738 { 4739 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4740 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4741 struct ieee80211_key *key; 4742 struct sta_info *sta; 4743 4744 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4745 kfree_skb(skb); 4746 return NETDEV_TX_OK; 4747 } 4748 4749 rcu_read_lock(); 4750 4751 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4752 kfree_skb(skb); 4753 goto out; 4754 } 4755 4756 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4757 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4758 sdata->control_port_protocol == ehdr->h_proto)) 4759 goto skip_offload; 4760 4761 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4762 if (!key) 4763 key = rcu_dereference(sdata->default_unicast_key); 4764 4765 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4766 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4767 goto skip_offload; 4768 4769 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4770 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4771 goto out; 4772 4773 skip_offload: 4774 ieee80211_subif_start_xmit(skb, dev); 4775 out: 4776 rcu_read_unlock(); 4777 4778 return NETDEV_TX_OK; 4779 } 4780 4781 struct sk_buff * 4782 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4783 struct sk_buff *skb, u32 info_flags) 4784 { 4785 struct ieee80211_hdr *hdr; 4786 struct ieee80211_tx_data tx = { 4787 .local = sdata->local, 4788 .sdata = sdata, 4789 }; 4790 struct sta_info *sta; 4791 4792 rcu_read_lock(); 4793 4794 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4795 kfree_skb(skb); 4796 skb = ERR_PTR(-EINVAL); 4797 goto out; 4798 } 4799 4800 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4801 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4802 if (IS_ERR(skb)) 4803 goto out; 4804 4805 hdr = (void *)skb->data; 4806 tx.sta = sta_info_get(sdata, hdr->addr1); 4807 tx.skb = skb; 4808 4809 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4810 rcu_read_unlock(); 4811 kfree_skb(skb); 4812 return ERR_PTR(-EINVAL); 4813 } 4814 4815 out: 4816 rcu_read_unlock(); 4817 return skb; 4818 } 4819 4820 /* 4821 * ieee80211_clear_tx_pending may not be called in a context where 4822 * it is possible that it packets could come in again. 4823 */ 4824 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4825 { 4826 struct sk_buff *skb; 4827 int i; 4828 4829 for (i = 0; i < local->hw.queues; i++) { 4830 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4831 ieee80211_free_txskb(&local->hw, skb); 4832 } 4833 } 4834 4835 /* 4836 * Returns false if the frame couldn't be transmitted but was queued instead, 4837 * which in this case means re-queued -- take as an indication to stop sending 4838 * more pending frames. 4839 */ 4840 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4841 struct sk_buff *skb) 4842 { 4843 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4844 struct ieee80211_sub_if_data *sdata; 4845 struct sta_info *sta; 4846 struct ieee80211_hdr *hdr; 4847 bool result; 4848 struct ieee80211_chanctx_conf *chanctx_conf; 4849 4850 sdata = vif_to_sdata(info->control.vif); 4851 4852 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4853 /* update band only for non-MLD */ 4854 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4855 chanctx_conf = 4856 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4857 if (unlikely(!chanctx_conf)) { 4858 dev_kfree_skb(skb); 4859 return true; 4860 } 4861 info->band = chanctx_conf->def.chan->band; 4862 } 4863 result = ieee80211_tx(sdata, NULL, skb, true); 4864 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4865 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4866 dev_kfree_skb(skb); 4867 return true; 4868 } 4869 4870 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4871 sta = NULL; 4872 4873 result = ieee80211_tx_8023(sdata, skb, sta, true); 4874 } else { 4875 struct sk_buff_head skbs; 4876 4877 __skb_queue_head_init(&skbs); 4878 __skb_queue_tail(&skbs, skb); 4879 4880 hdr = (struct ieee80211_hdr *)skb->data; 4881 sta = sta_info_get(sdata, hdr->addr1); 4882 4883 result = __ieee80211_tx(local, &skbs, sta, true); 4884 } 4885 4886 return result; 4887 } 4888 4889 /* 4890 * Transmit all pending packets. Called from tasklet. 4891 */ 4892 void ieee80211_tx_pending(struct tasklet_struct *t) 4893 { 4894 struct ieee80211_local *local = from_tasklet(local, t, 4895 tx_pending_tasklet); 4896 unsigned long flags; 4897 int i; 4898 bool txok; 4899 4900 rcu_read_lock(); 4901 4902 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4903 for (i = 0; i < local->hw.queues; i++) { 4904 /* 4905 * If queue is stopped by something other than due to pending 4906 * frames, or we have no pending frames, proceed to next queue. 4907 */ 4908 if (local->queue_stop_reasons[i] || 4909 skb_queue_empty(&local->pending[i])) 4910 continue; 4911 4912 while (!skb_queue_empty(&local->pending[i])) { 4913 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4915 4916 if (WARN_ON(!info->control.vif)) { 4917 ieee80211_free_txskb(&local->hw, skb); 4918 continue; 4919 } 4920 4921 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4922 flags); 4923 4924 txok = ieee80211_tx_pending_skb(local, skb); 4925 spin_lock_irqsave(&local->queue_stop_reason_lock, 4926 flags); 4927 if (!txok) 4928 break; 4929 } 4930 } 4931 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4932 4933 rcu_read_unlock(); 4934 } 4935 4936 /* functions for drivers to get certain frames */ 4937 4938 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 4939 struct sk_buff *skb, 4940 bool mcast_traffic) 4941 { 4942 int i, n1 = 0, n2; 4943 4944 /* 4945 * Find largest even number N1 so that bits numbered 1 through 4946 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4947 * (N2 + 1) x 8 through 2007 are 0. 4948 */ 4949 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4950 if (ps->tim[i]) { 4951 n1 = i & 0xfe; 4952 break; 4953 } 4954 } 4955 n2 = n1; 4956 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4957 if (ps->tim[i]) { 4958 n2 = i; 4959 break; 4960 } 4961 } 4962 4963 /* Bitmap control */ 4964 skb_put_u8(skb, n1 | mcast_traffic); 4965 /* Part Virt Bitmap */ 4966 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4967 } 4968 4969 /* 4970 * mac80211 currently supports encoding using block bitmap mode, non 4971 * inversed. The current implementation supports up to 1600 AIDs. 4972 * 4973 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 4974 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 4975 * describes 8 AIDs and the presence of a subblock is determined by 4976 * the block bitmap. 4977 */ 4978 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 4979 struct sk_buff *skb, 4980 bool mcast_traffic) 4981 { 4982 int blk; 4983 4984 /* 4985 * Emit a bitmap control block with a page slice number of 31 and a 4986 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 4987 * that the entire page (2048 bits) indicated by the page index 4988 * is encoded in the partial virtual bitmap. 4989 */ 4990 skb_put_u8(skb, mcast_traffic | (31 << 1)); 4991 4992 /* Emit an encoded block for each non-zero sub-block */ 4993 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 4994 u8 blk_bmap = 0; 4995 int sblk; 4996 4997 for (sblk = 0; sblk < 8; sblk++) { 4998 int sblk_idx = blk * 8 + sblk; 4999 5000 /* 5001 * If the current subblock is non-zero, increase the 5002 * number of subblocks to emit for the current block. 5003 */ 5004 if (ps->tim[sblk_idx]) 5005 blk_bmap |= BIT(sblk); 5006 } 5007 5008 /* If the current block contains no non-zero sublocks */ 5009 if (!blk_bmap) 5010 continue; 5011 5012 /* 5013 * Emit a block control byte for the current encoded block 5014 * with an encoding mode of block bitmap (0x0), not inverse 5015 * (0x0) and the current block offset (5 bits) 5016 */ 5017 skb_put_u8(skb, blk << 3); 5018 5019 /* 5020 * Emit the block bitmap for the current encoded block which 5021 * contains the present subblocks. 5022 */ 5023 skb_put_u8(skb, blk_bmap); 5024 5025 /* Emit the present subblocks */ 5026 for (sblk = 0; sblk < 8; sblk++) { 5027 int sblk_idx = blk * 8 + sblk; 5028 5029 if (!(blk_bmap & BIT(sblk))) 5030 continue; 5031 5032 skb_put_u8(skb, ps->tim[sblk_idx]); 5033 } 5034 } 5035 } 5036 5037 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5038 struct ieee80211_link_data *link, 5039 struct ps_data *ps, struct sk_buff *skb, 5040 bool is_template) 5041 { 5042 struct element *tim; 5043 bool mcast_traffic = false, have_bits = false; 5044 struct ieee80211_bss_conf *link_conf = link->conf; 5045 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5046 5047 /* Generate bitmap for TIM only if there are any STAs in power save 5048 * mode. */ 5049 if (atomic_read(&ps->num_sta_ps) > 0) 5050 /* in the hope that this is faster than 5051 * checking byte-for-byte */ 5052 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5053 IEEE80211_MAX_AID + 1); 5054 5055 if (!is_template) { 5056 if (ps->dtim_count == 0) 5057 ps->dtim_count = link_conf->dtim_period - 1; 5058 else 5059 ps->dtim_count--; 5060 } 5061 5062 /* Length is set after parsing the AID bitmap */ 5063 tim = skb_put(skb, sizeof(struct element)); 5064 tim->id = WLAN_EID_TIM; 5065 skb_put_u8(skb, ps->dtim_count); 5066 skb_put_u8(skb, link_conf->dtim_period); 5067 5068 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5069 mcast_traffic = true; 5070 5071 ps->dtim_bc_mc = mcast_traffic; 5072 5073 if (have_bits) { 5074 if (s1g) 5075 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, 5076 mcast_traffic); 5077 else 5078 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5079 } else { 5080 /* 5081 * If there is no buffered unicast traffic for an S1G 5082 * interface, we can exclude the bitmap control. This is in 5083 * contrast to other phy types as they do include the bitmap 5084 * control and pvb even when there is no buffered traffic. 5085 */ 5086 if (!s1g) { 5087 /* Bitmap control */ 5088 skb_put_u8(skb, mcast_traffic); 5089 /* Part Virt Bitmap */ 5090 skb_put_u8(skb, 0); 5091 } 5092 } 5093 5094 tim->datalen = skb_tail_pointer(skb) - tim->data; 5095 } 5096 5097 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5098 struct ieee80211_link_data *link, 5099 struct ps_data *ps, struct sk_buff *skb, 5100 bool is_template) 5101 { 5102 struct ieee80211_local *local = sdata->local; 5103 5104 /* 5105 * Not very nice, but we want to allow the driver to call 5106 * ieee80211_beacon_get() as a response to the set_tim() 5107 * callback. That, however, is already invoked under the 5108 * sta_lock to guarantee consistent and race-free update 5109 * of the tim bitmap in mac80211 and the driver. 5110 */ 5111 if (local->tim_in_locked_section) { 5112 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5113 } else { 5114 spin_lock_bh(&local->tim_lock); 5115 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5116 spin_unlock_bh(&local->tim_lock); 5117 } 5118 5119 return 0; 5120 } 5121 5122 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5123 struct beacon_data *beacon, 5124 struct ieee80211_link_data *link) 5125 { 5126 u8 *beacon_data, count, max_count = 1; 5127 struct probe_resp *resp; 5128 size_t beacon_data_len; 5129 u16 *bcn_offsets; 5130 int i; 5131 5132 switch (sdata->vif.type) { 5133 case NL80211_IFTYPE_AP: 5134 beacon_data = beacon->tail; 5135 beacon_data_len = beacon->tail_len; 5136 break; 5137 case NL80211_IFTYPE_ADHOC: 5138 beacon_data = beacon->head; 5139 beacon_data_len = beacon->head_len; 5140 break; 5141 case NL80211_IFTYPE_MESH_POINT: 5142 beacon_data = beacon->head; 5143 beacon_data_len = beacon->head_len; 5144 break; 5145 default: 5146 return; 5147 } 5148 5149 resp = rcu_dereference(link->u.ap.probe_resp); 5150 5151 bcn_offsets = beacon->cntdwn_counter_offsets; 5152 count = beacon->cntdwn_current_counter; 5153 if (link->conf->csa_active) 5154 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5155 5156 for (i = 0; i < max_count; ++i) { 5157 if (bcn_offsets[i]) { 5158 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5159 return; 5160 beacon_data[bcn_offsets[i]] = count; 5161 } 5162 5163 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5164 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5165 5166 resp->data[resp_offsets[i]] = count; 5167 } 5168 } 5169 } 5170 5171 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5172 struct beacon_data *beacon) 5173 { 5174 if (beacon->cntdwn_current_counter == 1) { 5175 /* 5176 * Channel switch handling is done by a worker thread while 5177 * beacons get pulled from hardware timers. It's therefore 5178 * possible that software threads are slow enough to not be 5179 * able to complete CSA handling in a single beacon interval, 5180 * in which case we get here. There isn't much to do about 5181 * it, other than letting the user know that the AP isn't 5182 * behaving correctly. 5183 */ 5184 link_err_once(link, 5185 "beacon TX faster than countdown (channel/color switch) completion\n"); 5186 return 0; 5187 } 5188 5189 beacon->cntdwn_current_counter--; 5190 5191 return beacon->cntdwn_current_counter; 5192 } 5193 5194 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5195 { 5196 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5197 struct ieee80211_link_data *link; 5198 struct beacon_data *beacon = NULL; 5199 u8 count = 0; 5200 5201 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5202 return 0; 5203 5204 rcu_read_lock(); 5205 5206 link = rcu_dereference(sdata->link[link_id]); 5207 if (!link) 5208 goto unlock; 5209 5210 if (sdata->vif.type == NL80211_IFTYPE_AP) 5211 beacon = rcu_dereference(link->u.ap.beacon); 5212 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5213 beacon = rcu_dereference(sdata->u.ibss.presp); 5214 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5215 beacon = rcu_dereference(sdata->u.mesh.beacon); 5216 5217 if (!beacon) 5218 goto unlock; 5219 5220 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5221 5222 unlock: 5223 rcu_read_unlock(); 5224 return count; 5225 } 5226 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5227 5228 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5229 { 5230 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5231 struct beacon_data *beacon = NULL; 5232 5233 rcu_read_lock(); 5234 5235 if (sdata->vif.type == NL80211_IFTYPE_AP) 5236 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5237 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5238 beacon = rcu_dereference(sdata->u.ibss.presp); 5239 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5240 beacon = rcu_dereference(sdata->u.mesh.beacon); 5241 5242 if (!beacon) 5243 goto unlock; 5244 5245 if (counter < beacon->cntdwn_current_counter) 5246 beacon->cntdwn_current_counter = counter; 5247 5248 unlock: 5249 rcu_read_unlock(); 5250 } 5251 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5252 5253 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5254 unsigned int link_id) 5255 { 5256 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5257 struct ieee80211_link_data *link; 5258 struct beacon_data *beacon = NULL; 5259 u8 *beacon_data; 5260 size_t beacon_data_len; 5261 int ret = false; 5262 5263 if (!ieee80211_sdata_running(sdata)) 5264 return false; 5265 5266 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5267 return 0; 5268 5269 rcu_read_lock(); 5270 5271 link = rcu_dereference(sdata->link[link_id]); 5272 if (!link) 5273 goto out; 5274 5275 if (vif->type == NL80211_IFTYPE_AP) { 5276 beacon = rcu_dereference(link->u.ap.beacon); 5277 if (WARN_ON(!beacon || !beacon->tail)) 5278 goto out; 5279 beacon_data = beacon->tail; 5280 beacon_data_len = beacon->tail_len; 5281 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5282 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5283 5284 beacon = rcu_dereference(ifibss->presp); 5285 if (!beacon) 5286 goto out; 5287 5288 beacon_data = beacon->head; 5289 beacon_data_len = beacon->head_len; 5290 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5291 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5292 5293 beacon = rcu_dereference(ifmsh->beacon); 5294 if (!beacon) 5295 goto out; 5296 5297 beacon_data = beacon->head; 5298 beacon_data_len = beacon->head_len; 5299 } else { 5300 WARN_ON(1); 5301 goto out; 5302 } 5303 5304 if (!beacon->cntdwn_counter_offsets[0]) 5305 goto out; 5306 5307 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5308 goto out; 5309 5310 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5311 ret = true; 5312 5313 out: 5314 rcu_read_unlock(); 5315 5316 return ret; 5317 } 5318 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5319 5320 static int ieee80211_beacon_protect(struct sk_buff *skb, 5321 struct ieee80211_local *local, 5322 struct ieee80211_sub_if_data *sdata, 5323 struct ieee80211_link_data *link) 5324 { 5325 ieee80211_tx_result res; 5326 struct ieee80211_tx_data tx; 5327 struct sk_buff *check_skb; 5328 5329 memset(&tx, 0, sizeof(tx)); 5330 tx.key = rcu_dereference(link->default_beacon_key); 5331 if (!tx.key) 5332 return 0; 5333 5334 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5335 tx.key = NULL; 5336 return -EINVAL; 5337 } 5338 5339 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5340 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5341 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5342 5343 tx.local = local; 5344 tx.sdata = sdata; 5345 __skb_queue_head_init(&tx.skbs); 5346 __skb_queue_tail(&tx.skbs, skb); 5347 res = ieee80211_tx_h_encrypt(&tx); 5348 check_skb = __skb_dequeue(&tx.skbs); 5349 /* we may crash after this, but it'd be a bug in crypto */ 5350 WARN_ON(check_skb != skb); 5351 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5352 return -EINVAL; 5353 5354 return 0; 5355 } 5356 5357 int ieee80211_encrypt_tx_skb(struct sk_buff *skb) 5358 { 5359 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5360 struct ieee80211_sub_if_data *sdata; 5361 struct sk_buff *check_skb; 5362 struct ieee80211_tx_data tx; 5363 ieee80211_tx_result res; 5364 5365 if (!info->control.hw_key) 5366 return 0; 5367 5368 memset(&tx, 0, sizeof(tx)); 5369 tx.key = container_of(info->control.hw_key, struct ieee80211_key, conf); 5370 /* NULL it out now so we do full SW crypto */ 5371 info->control.hw_key = NULL; 5372 __skb_queue_head_init(&tx.skbs); 5373 __skb_queue_tail(&tx.skbs, skb); 5374 5375 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5376 tx.sdata = sdata; 5377 tx.local = sdata->local; 5378 res = ieee80211_tx_h_encrypt(&tx); 5379 check_skb = __skb_dequeue(&tx.skbs); 5380 /* we may crash after this, but it'd be a bug in crypto */ 5381 WARN_ON(check_skb != skb); 5382 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5383 return -EINVAL; 5384 5385 return 0; 5386 } 5387 EXPORT_SYMBOL_GPL(ieee80211_encrypt_tx_skb); 5388 5389 static void 5390 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5391 struct ieee80211_vif *vif, 5392 struct ieee80211_link_data *link, 5393 struct ieee80211_mutable_offsets *offs, 5394 struct beacon_data *beacon, 5395 struct sk_buff *skb, 5396 struct ieee80211_chanctx_conf *chanctx_conf, 5397 u16 csa_off_base) 5398 { 5399 struct ieee80211_local *local = hw_to_local(hw); 5400 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5401 struct ieee80211_tx_info *info; 5402 enum nl80211_band band; 5403 struct ieee80211_tx_rate_control txrc; 5404 5405 /* CSA offsets */ 5406 if (offs && beacon) { 5407 u16 i; 5408 5409 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5410 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5411 5412 if (!csa_off) 5413 continue; 5414 5415 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5416 } 5417 } 5418 5419 band = chanctx_conf->def.chan->band; 5420 info = IEEE80211_SKB_CB(skb); 5421 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5422 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5423 info->band = band; 5424 5425 memset(&txrc, 0, sizeof(txrc)); 5426 txrc.hw = hw; 5427 txrc.sband = local->hw.wiphy->bands[band]; 5428 txrc.bss_conf = link->conf; 5429 txrc.skb = skb; 5430 txrc.reported_rate.idx = -1; 5431 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5432 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5433 else 5434 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5435 txrc.bss = true; 5436 rate_control_get_rate(sdata, NULL, &txrc); 5437 5438 info->control.vif = vif; 5439 info->control.flags |= u32_encode_bits(link->link_id, 5440 IEEE80211_TX_CTRL_MLO_LINK); 5441 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5442 IEEE80211_TX_CTL_ASSIGN_SEQ | 5443 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5444 } 5445 5446 static void 5447 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5448 u8 i) 5449 { 5450 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5451 i > beacon->mbssid_ies->cnt) 5452 return; 5453 5454 if (i < beacon->mbssid_ies->cnt) { 5455 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5456 beacon->mbssid_ies->elem[i].len); 5457 5458 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5459 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5460 beacon->rnr_ies->elem[i].len); 5461 5462 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5463 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5464 beacon->rnr_ies->elem[i].len); 5465 } 5466 return; 5467 } 5468 5469 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5470 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5471 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5472 beacon->mbssid_ies->elem[i].len); 5473 } 5474 5475 static struct sk_buff * 5476 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5477 struct ieee80211_vif *vif, 5478 struct ieee80211_link_data *link, 5479 struct ieee80211_mutable_offsets *offs, 5480 bool is_template, 5481 struct beacon_data *beacon, 5482 struct ieee80211_chanctx_conf *chanctx_conf, 5483 u8 ema_index) 5484 { 5485 struct ieee80211_local *local = hw_to_local(hw); 5486 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5487 struct ieee80211_if_ap *ap = &sdata->u.ap; 5488 struct sk_buff *skb = NULL; 5489 u16 csa_off_base = 0; 5490 int mbssid_len; 5491 5492 if (beacon->cntdwn_counter_offsets[0]) { 5493 if (!is_template) 5494 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5495 5496 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5497 } 5498 5499 /* headroom, head length, 5500 * tail length, maximum TIM length and multiple BSSID length 5501 */ 5502 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5503 beacon->rnr_ies, 5504 ema_index); 5505 5506 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5507 beacon->tail_len + 256 + 5508 local->hw.extra_beacon_tailroom + mbssid_len); 5509 if (!skb) 5510 return NULL; 5511 5512 skb_reserve(skb, local->tx_headroom); 5513 skb_put_data(skb, beacon->head, beacon->head_len); 5514 5515 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5516 5517 if (offs) { 5518 offs->tim_offset = beacon->head_len; 5519 offs->tim_length = skb->len - beacon->head_len; 5520 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5521 5522 if (mbssid_len) { 5523 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5524 offs->mbssid_off = skb->len - mbssid_len; 5525 } 5526 5527 /* for AP the csa offsets are from tail */ 5528 csa_off_base = skb->len; 5529 } 5530 5531 if (beacon->tail) 5532 skb_put_data(skb, beacon->tail, beacon->tail_len); 5533 5534 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5535 dev_kfree_skb(skb); 5536 return NULL; 5537 } 5538 5539 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5540 chanctx_conf, csa_off_base); 5541 return skb; 5542 } 5543 5544 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5545 struct ieee80211_link_data *link) 5546 { 5547 struct ps_data *ps = &sdata->u.ap.ps; 5548 5549 if (ps->sb_count == 0) 5550 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5551 else 5552 ps->sb_count--; 5553 5554 return ps->sb_count == 0; 5555 } 5556 5557 static struct sk_buff * 5558 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5559 struct ieee80211_vif *vif, 5560 struct ieee80211_link_data *link, 5561 struct ieee80211_chanctx_conf *chanctx_conf, 5562 struct s1g_short_beacon_data *sb, 5563 bool is_template) 5564 { 5565 struct ieee80211_local *local = hw_to_local(hw); 5566 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5567 struct ieee80211_if_ap *ap = &sdata->u.ap; 5568 struct sk_buff *skb; 5569 5570 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5571 sb->short_tail_len + 256 + 5572 local->hw.extra_beacon_tailroom); 5573 if (!skb) 5574 return NULL; 5575 5576 skb_reserve(skb, local->tx_headroom); 5577 skb_put_data(skb, sb->short_head, sb->short_head_len); 5578 5579 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5580 5581 if (sb->short_tail) 5582 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5583 5584 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5585 chanctx_conf, 0); 5586 return skb; 5587 } 5588 5589 static struct sk_buff * 5590 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5591 struct ieee80211_link_data *link, 5592 struct ieee80211_mutable_offsets *offs, 5593 bool is_template, struct beacon_data *beacon, 5594 struct ieee80211_chanctx_conf *chanctx_conf, 5595 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5596 { 5597 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5598 5599 if (!sdata->vif.cfg.s1g || !s1g_sb || 5600 ieee80211_s1g_need_long_beacon(sdata, link)) 5601 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5602 is_template, beacon, 5603 chanctx_conf, ema_index); 5604 5605 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5606 s1g_sb, is_template); 5607 } 5608 5609 static struct ieee80211_ema_beacons * 5610 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5611 struct ieee80211_vif *vif, 5612 struct ieee80211_link_data *link, 5613 struct ieee80211_mutable_offsets *offs, 5614 bool is_template, struct beacon_data *beacon, 5615 struct ieee80211_chanctx_conf *chanctx_conf) 5616 { 5617 struct ieee80211_ema_beacons *ema = NULL; 5618 5619 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5620 return NULL; 5621 5622 ema = kzalloc_flex(*ema, bcn, beacon->mbssid_ies->cnt, GFP_ATOMIC); 5623 if (!ema) 5624 return NULL; 5625 5626 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5627 ema->bcn[ema->cnt].skb = 5628 ieee80211_beacon_get_ap(hw, vif, link, 5629 &ema->bcn[ema->cnt].offs, 5630 is_template, beacon, 5631 chanctx_conf, ema->cnt, NULL); 5632 if (!ema->bcn[ema->cnt].skb) 5633 break; 5634 } 5635 5636 if (ema->cnt == beacon->mbssid_ies->cnt) 5637 return ema; 5638 5639 ieee80211_beacon_free_ema_list(ema); 5640 return NULL; 5641 } 5642 5643 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5644 5645 static struct sk_buff * 5646 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5647 struct ieee80211_vif *vif, 5648 struct ieee80211_mutable_offsets *offs, 5649 bool is_template, 5650 unsigned int link_id, 5651 int ema_index, 5652 struct ieee80211_ema_beacons **ema_beacons) 5653 { 5654 struct ieee80211_local *local = hw_to_local(hw); 5655 struct beacon_data *beacon = NULL; 5656 struct sk_buff *skb = NULL; 5657 struct ieee80211_sub_if_data *sdata = NULL; 5658 struct ieee80211_chanctx_conf *chanctx_conf; 5659 struct ieee80211_link_data *link; 5660 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5661 5662 rcu_read_lock(); 5663 5664 sdata = vif_to_sdata(vif); 5665 link = rcu_dereference(sdata->link[link_id]); 5666 if (!link) 5667 goto out; 5668 chanctx_conf = 5669 rcu_dereference(link->conf->chanctx_conf); 5670 5671 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5672 goto out; 5673 5674 if (offs) 5675 memset(offs, 0, sizeof(*offs)); 5676 5677 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5678 beacon = rcu_dereference(link->u.ap.beacon); 5679 if (!beacon) 5680 goto out; 5681 5682 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5683 s1g_short_bcn = 5684 rcu_dereference(link->u.ap.s1g_short_beacon); 5685 if (!s1g_short_bcn) 5686 goto out; 5687 } 5688 5689 if (ema_beacons) { 5690 *ema_beacons = 5691 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5692 offs, 5693 is_template, 5694 beacon, 5695 chanctx_conf); 5696 } else { 5697 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5698 if (ema_index >= beacon->mbssid_ies->cnt) 5699 goto out; /* End of MBSSID elements */ 5700 5701 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5702 ema_index = beacon->mbssid_ies->cnt; 5703 } else { 5704 ema_index = 0; 5705 } 5706 5707 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5708 is_template, beacon, 5709 chanctx_conf, ema_index, 5710 s1g_short_bcn); 5711 } 5712 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5713 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5714 struct ieee80211_hdr *hdr; 5715 5716 beacon = rcu_dereference(ifibss->presp); 5717 if (!beacon) 5718 goto out; 5719 5720 if (beacon->cntdwn_counter_offsets[0]) { 5721 if (!is_template) 5722 __ieee80211_beacon_update_cntdwn(link, beacon); 5723 5724 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5725 } 5726 5727 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5728 local->hw.extra_beacon_tailroom); 5729 if (!skb) 5730 goto out; 5731 skb_reserve(skb, local->tx_headroom); 5732 skb_put_data(skb, beacon->head, beacon->head_len); 5733 5734 hdr = (struct ieee80211_hdr *) skb->data; 5735 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5736 IEEE80211_STYPE_BEACON); 5737 5738 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5739 chanctx_conf, 0); 5740 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5741 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5742 5743 beacon = rcu_dereference(ifmsh->beacon); 5744 if (!beacon) 5745 goto out; 5746 5747 if (beacon->cntdwn_counter_offsets[0]) { 5748 if (!is_template) 5749 /* TODO: For mesh csa_counter is in TU, so 5750 * decrementing it by one isn't correct, but 5751 * for now we leave it consistent with overall 5752 * mac80211's behavior. 5753 */ 5754 __ieee80211_beacon_update_cntdwn(link, beacon); 5755 5756 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5757 } 5758 5759 if (ifmsh->sync_ops) 5760 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5761 5762 skb = dev_alloc_skb(local->tx_headroom + 5763 beacon->head_len + 5764 256 + /* TIM IE */ 5765 beacon->tail_len + 5766 local->hw.extra_beacon_tailroom); 5767 if (!skb) 5768 goto out; 5769 skb_reserve(skb, local->tx_headroom); 5770 skb_put_data(skb, beacon->head, beacon->head_len); 5771 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5772 is_template); 5773 5774 if (offs) { 5775 offs->tim_offset = beacon->head_len; 5776 offs->tim_length = skb->len - beacon->head_len; 5777 } 5778 5779 skb_put_data(skb, beacon->tail, beacon->tail_len); 5780 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5781 chanctx_conf, 0); 5782 } else { 5783 WARN_ON(1); 5784 goto out; 5785 } 5786 5787 out: 5788 rcu_read_unlock(); 5789 return skb; 5790 5791 } 5792 5793 struct sk_buff * 5794 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5795 struct ieee80211_vif *vif, 5796 struct ieee80211_mutable_offsets *offs, 5797 unsigned int link_id) 5798 { 5799 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5800 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5801 } 5802 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5803 5804 struct sk_buff * 5805 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5806 struct ieee80211_vif *vif, 5807 struct ieee80211_mutable_offsets *offs, 5808 unsigned int link_id, u8 ema_index) 5809 { 5810 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5811 NULL); 5812 } 5813 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5814 5815 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5816 { 5817 u8 i; 5818 5819 if (!ema_beacons) 5820 return; 5821 5822 for (i = 0; i < ema_beacons->cnt; i++) 5823 kfree_skb(ema_beacons->bcn[i].skb); 5824 5825 kfree(ema_beacons); 5826 } 5827 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5828 5829 struct ieee80211_ema_beacons * 5830 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5831 struct ieee80211_vif *vif, 5832 unsigned int link_id) 5833 { 5834 struct ieee80211_ema_beacons *ema_beacons = NULL; 5835 5836 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5837 &ema_beacons)); 5838 5839 return ema_beacons; 5840 } 5841 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5842 5843 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5844 struct ieee80211_vif *vif, 5845 u16 *tim_offset, u16 *tim_length, 5846 unsigned int link_id) 5847 { 5848 struct ieee80211_mutable_offsets offs = {}; 5849 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5850 link_id, 5851 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5852 NULL); 5853 struct sk_buff *copy; 5854 5855 if (!bcn) 5856 return bcn; 5857 5858 if (tim_offset) 5859 *tim_offset = offs.tim_offset; 5860 5861 if (tim_length) 5862 *tim_length = offs.tim_length; 5863 5864 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5865 !hw_to_local(hw)->monitors) 5866 return bcn; 5867 5868 /* send a copy to monitor interfaces */ 5869 copy = skb_copy(bcn, GFP_ATOMIC); 5870 if (!copy) 5871 return bcn; 5872 5873 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 5874 5875 return bcn; 5876 } 5877 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5878 5879 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5880 struct ieee80211_vif *vif) 5881 { 5882 struct sk_buff *skb = NULL; 5883 struct probe_resp *presp = NULL; 5884 struct ieee80211_hdr *hdr; 5885 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5886 5887 if (sdata->vif.type != NL80211_IFTYPE_AP) 5888 return NULL; 5889 5890 rcu_read_lock(); 5891 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5892 if (!presp) 5893 goto out; 5894 5895 skb = dev_alloc_skb(presp->len); 5896 if (!skb) 5897 goto out; 5898 5899 skb_put_data(skb, presp->data, presp->len); 5900 5901 hdr = (struct ieee80211_hdr *) skb->data; 5902 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5903 5904 out: 5905 rcu_read_unlock(); 5906 return skb; 5907 } 5908 EXPORT_SYMBOL(ieee80211_proberesp_get); 5909 5910 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5911 struct ieee80211_vif *vif, 5912 unsigned int link_id) 5913 { 5914 struct sk_buff *skb = NULL; 5915 struct fils_discovery_data *tmpl = NULL; 5916 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5917 struct ieee80211_link_data *link; 5918 5919 if (sdata->vif.type != NL80211_IFTYPE_AP) 5920 return NULL; 5921 5922 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 5923 return NULL; 5924 5925 guard(rcu)(); 5926 link = rcu_dereference(sdata->link[link_id]); 5927 if (!link) 5928 return NULL; 5929 5930 tmpl = rcu_dereference(link->u.ap.fils_discovery); 5931 if (!tmpl) 5932 return NULL; 5933 5934 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5935 if (skb) { 5936 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5937 skb_put_data(skb, tmpl->data, tmpl->len); 5938 } 5939 5940 return skb; 5941 } 5942 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5943 5944 struct sk_buff * 5945 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5946 struct ieee80211_vif *vif, 5947 unsigned int link_id) 5948 { 5949 struct sk_buff *skb = NULL; 5950 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5951 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5952 struct ieee80211_link_data *link; 5953 5954 if (sdata->vif.type != NL80211_IFTYPE_AP) 5955 return NULL; 5956 5957 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 5958 return NULL; 5959 5960 guard(rcu)(); 5961 link = rcu_dereference(sdata->link[link_id]); 5962 if (!link) 5963 return NULL; 5964 5965 tmpl = rcu_dereference(link->u.ap.unsol_bcast_probe_resp); 5966 if (!tmpl) 5967 return NULL; 5968 5969 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5970 if (skb) { 5971 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5972 skb_put_data(skb, tmpl->data, tmpl->len); 5973 } 5974 5975 return skb; 5976 } 5977 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5978 5979 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5980 struct ieee80211_vif *vif) 5981 { 5982 struct ieee80211_sub_if_data *sdata; 5983 struct ieee80211_pspoll *pspoll; 5984 struct ieee80211_local *local; 5985 struct sk_buff *skb; 5986 5987 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5988 return NULL; 5989 5990 sdata = vif_to_sdata(vif); 5991 local = sdata->local; 5992 5993 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5994 if (!skb) 5995 return NULL; 5996 5997 skb_reserve(skb, local->hw.extra_tx_headroom); 5998 5999 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 6000 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 6001 IEEE80211_STYPE_PSPOLL); 6002 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 6003 6004 /* aid in PS-Poll has its two MSBs each set to 1 */ 6005 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 6006 6007 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 6008 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 6009 6010 return skb; 6011 } 6012 EXPORT_SYMBOL(ieee80211_pspoll_get); 6013 6014 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 6015 struct ieee80211_vif *vif, 6016 int link_id, bool qos_ok) 6017 { 6018 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6019 struct ieee80211_local *local = sdata->local; 6020 struct ieee80211_link_data *link = NULL; 6021 struct ieee80211_hdr_3addr *nullfunc; 6022 struct sk_buff *skb; 6023 bool qos = false; 6024 6025 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6026 return NULL; 6027 6028 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6029 sizeof(*nullfunc) + 2); 6030 if (!skb) 6031 return NULL; 6032 6033 rcu_read_lock(); 6034 if (qos_ok) { 6035 struct sta_info *sta; 6036 6037 sta = sta_info_get(sdata, vif->cfg.ap_addr); 6038 qos = sta && sta->sta.wme; 6039 } 6040 6041 if (link_id >= 0) { 6042 link = rcu_dereference(sdata->link[link_id]); 6043 if (WARN_ON_ONCE(!link)) { 6044 rcu_read_unlock(); 6045 kfree_skb(skb); 6046 return NULL; 6047 } 6048 } 6049 6050 skb_reserve(skb, local->hw.extra_tx_headroom); 6051 6052 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 6053 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 6054 IEEE80211_STYPE_NULLFUNC | 6055 IEEE80211_FCTL_TODS); 6056 if (qos) { 6057 __le16 qoshdr = cpu_to_le16(7); 6058 6059 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 6060 IEEE80211_STYPE_NULLFUNC) != 6061 IEEE80211_STYPE_QOS_NULLFUNC); 6062 nullfunc->frame_control |= 6063 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 6064 skb->priority = 7; 6065 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 6066 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 6067 } 6068 6069 if (link) { 6070 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 6071 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 6072 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 6073 } else { 6074 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 6075 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 6076 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 6077 } 6078 rcu_read_unlock(); 6079 6080 return skb; 6081 } 6082 EXPORT_SYMBOL(ieee80211_nullfunc_get); 6083 6084 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 6085 const u8 *src_addr, 6086 const u8 *ssid, size_t ssid_len, 6087 size_t tailroom) 6088 { 6089 struct ieee80211_local *local = hw_to_local(hw); 6090 struct ieee80211_hdr_3addr *hdr; 6091 struct sk_buff *skb; 6092 size_t ie_ssid_len; 6093 u8 *pos; 6094 6095 ie_ssid_len = 2 + ssid_len; 6096 6097 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6098 ie_ssid_len + tailroom); 6099 if (!skb) 6100 return NULL; 6101 6102 skb_reserve(skb, local->hw.extra_tx_headroom); 6103 6104 hdr = skb_put_zero(skb, sizeof(*hdr)); 6105 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6106 IEEE80211_STYPE_PROBE_REQ); 6107 eth_broadcast_addr(hdr->addr1); 6108 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6109 eth_broadcast_addr(hdr->addr3); 6110 6111 pos = skb_put(skb, ie_ssid_len); 6112 *pos++ = WLAN_EID_SSID; 6113 *pos++ = ssid_len; 6114 if (ssid_len) 6115 memcpy(pos, ssid, ssid_len); 6116 pos += ssid_len; 6117 6118 return skb; 6119 } 6120 EXPORT_SYMBOL(ieee80211_probereq_get); 6121 6122 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6123 const void *frame, size_t frame_len, 6124 const struct ieee80211_tx_info *frame_txctl, 6125 struct ieee80211_rts *rts) 6126 { 6127 const struct ieee80211_hdr *hdr = frame; 6128 6129 rts->frame_control = 6130 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6131 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6132 frame_txctl); 6133 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6134 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6135 } 6136 EXPORT_SYMBOL(ieee80211_rts_get); 6137 6138 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6139 const void *frame, size_t frame_len, 6140 const struct ieee80211_tx_info *frame_txctl, 6141 struct ieee80211_cts *cts) 6142 { 6143 const struct ieee80211_hdr *hdr = frame; 6144 6145 cts->frame_control = 6146 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6147 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6148 frame_len, frame_txctl); 6149 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6150 } 6151 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6152 6153 struct sk_buff * 6154 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6155 struct ieee80211_vif *vif) 6156 { 6157 struct ieee80211_local *local = hw_to_local(hw); 6158 struct sk_buff *skb = NULL; 6159 struct ieee80211_tx_data tx; 6160 struct ieee80211_sub_if_data *sdata; 6161 struct ps_data *ps; 6162 struct ieee80211_tx_info *info; 6163 struct ieee80211_chanctx_conf *chanctx_conf; 6164 6165 sdata = vif_to_sdata(vif); 6166 6167 rcu_read_lock(); 6168 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6169 6170 if (!chanctx_conf) 6171 goto out; 6172 6173 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6174 struct beacon_data *beacon = 6175 rcu_dereference(sdata->deflink.u.ap.beacon); 6176 6177 if (!beacon || !beacon->head) 6178 goto out; 6179 6180 ps = &sdata->u.ap.ps; 6181 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6182 ps = &sdata->u.mesh.ps; 6183 } else { 6184 goto out; 6185 } 6186 6187 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6188 goto out; /* send buffered bc/mc only after DTIM beacon */ 6189 6190 while (1) { 6191 skb = skb_dequeue(&ps->bc_buf); 6192 if (!skb) 6193 goto out; 6194 local->total_ps_buffered--; 6195 6196 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6197 struct ieee80211_hdr *hdr = 6198 (struct ieee80211_hdr *) skb->data; 6199 /* more buffered multicast/broadcast frames ==> set 6200 * MoreData flag in IEEE 802.11 header to inform PS 6201 * STAs */ 6202 hdr->frame_control |= 6203 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6204 } 6205 6206 if (sdata->vif.type == NL80211_IFTYPE_AP) 6207 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6208 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6209 break; 6210 ieee80211_free_txskb(hw, skb); 6211 } 6212 6213 info = IEEE80211_SKB_CB(skb); 6214 6215 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6216 info->band = chanctx_conf->def.chan->band; 6217 6218 if (invoke_tx_handlers(&tx)) 6219 skb = NULL; 6220 out: 6221 rcu_read_unlock(); 6222 6223 return skb; 6224 } 6225 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6226 6227 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6228 { 6229 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6230 struct ieee80211_sub_if_data *sdata = sta->sdata; 6231 struct ieee80211_local *local = sdata->local; 6232 int ret; 6233 u32 queues; 6234 6235 lockdep_assert_wiphy(local->hw.wiphy); 6236 6237 /* only some cases are supported right now */ 6238 switch (sdata->vif.type) { 6239 case NL80211_IFTYPE_STATION: 6240 case NL80211_IFTYPE_AP: 6241 case NL80211_IFTYPE_AP_VLAN: 6242 break; 6243 default: 6244 WARN_ON(1); 6245 return -EINVAL; 6246 } 6247 6248 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6249 return -EINVAL; 6250 6251 if (sta->reserved_tid == tid) { 6252 ret = 0; 6253 goto out; 6254 } 6255 6256 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6257 sdata_err(sdata, "TID reservation already active\n"); 6258 ret = -EALREADY; 6259 goto out; 6260 } 6261 6262 ieee80211_stop_vif_queues(sdata->local, sdata, 6263 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6264 6265 synchronize_net(); 6266 6267 /* Tear down BA sessions so we stop aggregating on this TID */ 6268 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6269 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6270 __ieee80211_stop_tx_ba_session(sta, tid, 6271 AGG_STOP_LOCAL_REQUEST); 6272 } 6273 6274 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6275 __ieee80211_flush_queues(local, sdata, queues, false); 6276 6277 sta->reserved_tid = tid; 6278 6279 ieee80211_wake_vif_queues(local, sdata, 6280 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6281 6282 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6283 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6284 6285 ret = 0; 6286 out: 6287 return ret; 6288 } 6289 EXPORT_SYMBOL(ieee80211_reserve_tid); 6290 6291 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6292 { 6293 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6294 struct ieee80211_sub_if_data *sdata = sta->sdata; 6295 6296 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6297 6298 /* only some cases are supported right now */ 6299 switch (sdata->vif.type) { 6300 case NL80211_IFTYPE_STATION: 6301 case NL80211_IFTYPE_AP: 6302 case NL80211_IFTYPE_AP_VLAN: 6303 break; 6304 default: 6305 WARN_ON(1); 6306 return; 6307 } 6308 6309 if (tid != sta->reserved_tid) { 6310 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6311 return; 6312 } 6313 6314 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6315 } 6316 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6317 6318 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6319 struct sk_buff *skb, int tid, int link_id, 6320 enum nl80211_band band) 6321 { 6322 const struct ieee80211_hdr *hdr = (void *)skb->data; 6323 int ac = ieee80211_ac_from_tid(tid); 6324 unsigned int link; 6325 6326 skb_reset_mac_header(skb); 6327 skb_set_queue_mapping(skb, ac); 6328 skb->priority = tid; 6329 6330 skb->dev = sdata->dev; 6331 6332 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6333 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6334 IEEE80211_LINK_UNSPECIFIED)); 6335 6336 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6337 link = 0; 6338 } else if (link_id >= 0) { 6339 link = link_id; 6340 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6341 /* address from the MLD */ 6342 link = IEEE80211_LINK_UNSPECIFIED; 6343 } else { 6344 /* otherwise must be addressed from a link */ 6345 rcu_read_lock(); 6346 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6347 struct ieee80211_bss_conf *link_conf; 6348 6349 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6350 if (!link_conf) 6351 continue; 6352 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6353 break; 6354 } 6355 rcu_read_unlock(); 6356 6357 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6358 link = ffs(sdata->vif.active_links) - 1; 6359 } 6360 6361 IEEE80211_SKB_CB(skb)->control.flags |= 6362 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6363 6364 /* 6365 * The other path calling ieee80211_xmit is from the tasklet, 6366 * and while we can handle concurrent transmissions locking 6367 * requirements are that we do not come into tx with bhs on. 6368 */ 6369 local_bh_disable(); 6370 IEEE80211_SKB_CB(skb)->band = band; 6371 ieee80211_xmit(sdata, NULL, skb); 6372 local_bh_enable(); 6373 } 6374 6375 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6376 struct sk_buff *skb, int tid, int link_id) 6377 { 6378 struct ieee80211_chanctx_conf *chanctx_conf; 6379 enum nl80211_band band; 6380 6381 rcu_read_lock(); 6382 if (sdata->vif.type == NL80211_IFTYPE_NAN) { 6383 band = NUM_NL80211_BANDS; 6384 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6385 WARN_ON(link_id >= 0); 6386 chanctx_conf = 6387 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6388 if (WARN_ON(!chanctx_conf)) { 6389 rcu_read_unlock(); 6390 kfree_skb(skb); 6391 return; 6392 } 6393 band = chanctx_conf->def.chan->band; 6394 } else { 6395 WARN_ON(link_id >= 0 && 6396 !(sdata->vif.active_links & BIT(link_id))); 6397 /* MLD transmissions must not rely on the band */ 6398 band = 0; 6399 } 6400 6401 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6402 rcu_read_unlock(); 6403 } 6404 6405 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6406 const u8 *buf, size_t len, 6407 const u8 *dest, __be16 proto, bool unencrypted, 6408 int link_id, u64 *cookie) 6409 { 6410 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6411 struct ieee80211_local *local = sdata->local; 6412 struct sta_info *sta; 6413 struct sk_buff *skb; 6414 struct ethhdr *ehdr; 6415 u32 ctrl_flags = 0; 6416 u32 flags = 0; 6417 int err; 6418 6419 /* mutex lock is only needed for incrementing the cookie counter */ 6420 lockdep_assert_wiphy(local->hw.wiphy); 6421 6422 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6423 * or Pre-Authentication 6424 */ 6425 if (proto != sdata->control_port_protocol && 6426 proto != cpu_to_be16(ETH_P_PREAUTH)) 6427 return -EINVAL; 6428 6429 if (proto == sdata->control_port_protocol) 6430 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6431 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6432 6433 if (unencrypted) 6434 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6435 6436 if (cookie) 6437 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6438 6439 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6440 6441 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6442 sizeof(struct ethhdr) + len); 6443 if (!skb) 6444 return -ENOMEM; 6445 6446 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6447 6448 skb_put_data(skb, buf, len); 6449 6450 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6451 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6452 6453 /* we may override the SA for MLO STA later */ 6454 if (link_id < 0) { 6455 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6456 IEEE80211_TX_CTRL_MLO_LINK); 6457 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6458 } else { 6459 struct ieee80211_bss_conf *link_conf; 6460 6461 ctrl_flags |= u32_encode_bits(link_id, 6462 IEEE80211_TX_CTRL_MLO_LINK); 6463 6464 rcu_read_lock(); 6465 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6466 if (!link_conf) { 6467 dev_kfree_skb(skb); 6468 rcu_read_unlock(); 6469 return -ENOLINK; 6470 } 6471 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6472 rcu_read_unlock(); 6473 } 6474 6475 ehdr->h_proto = proto; 6476 6477 skb->dev = dev; 6478 skb->protocol = proto; 6479 skb_reset_network_header(skb); 6480 skb_reset_mac_header(skb); 6481 6482 if (local->hw.queues < IEEE80211_NUM_ACS) 6483 goto start_xmit; 6484 6485 /* update QoS header to prioritize control port frames if possible, 6486 * prioritization also happens for control port frames send over 6487 * AF_PACKET 6488 */ 6489 rcu_read_lock(); 6490 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6491 if (err) { 6492 dev_kfree_skb(skb); 6493 rcu_read_unlock(); 6494 return err; 6495 } 6496 6497 if (!IS_ERR(sta)) { 6498 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6499 6500 skb_set_queue_mapping(skb, queue); 6501 6502 /* 6503 * for MLO STA, the SA should be the AP MLD address, but 6504 * the link ID has been selected already 6505 */ 6506 if (sta && sta->sta.mlo) 6507 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6508 } 6509 rcu_read_unlock(); 6510 6511 start_xmit: 6512 local_bh_disable(); 6513 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6514 local_bh_enable(); 6515 6516 return 0; 6517 } 6518 6519 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6520 const u8 *buf, size_t len) 6521 { 6522 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6523 struct ieee80211_local *local = sdata->local; 6524 struct sk_buff *skb; 6525 6526 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6527 30 + /* header size */ 6528 18); /* 11s header size */ 6529 if (!skb) 6530 return -ENOMEM; 6531 6532 skb_reserve(skb, local->hw.extra_tx_headroom); 6533 skb_put_data(skb, buf, len); 6534 6535 skb->dev = dev; 6536 skb->protocol = htons(ETH_P_802_3); 6537 skb_reset_network_header(skb); 6538 skb_reset_mac_header(skb); 6539 6540 local_bh_disable(); 6541 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6542 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6543 NULL); 6544 local_bh_enable(); 6545 6546 return 0; 6547 } 6548