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