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) 2018-2026 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <linux/unaligned.h> 28 #include <net/fq_impl.h> 29 #include <net/sock.h> 30 #include <net/gso.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 44 struct sk_buff *skb, int group_addr, 45 int next_frag_len) 46 { 47 int rate, mrate, erp, dur, i; 48 struct ieee80211_rate *txrate; 49 struct ieee80211_local *local = tx->local; 50 struct ieee80211_supported_band *sband; 51 struct ieee80211_hdr *hdr; 52 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 /* uh huh? */ 59 if (WARN_ON_ONCE(tx->rate.idx < 0)) 60 return 0; 61 62 if (info->band >= NUM_NL80211_BANDS) 63 return 0; 64 65 sband = local->hw.wiphy->bands[info->band]; 66 txrate = &sband->bitrates[tx->rate.idx]; 67 68 erp = txrate->flags & IEEE80211_RATE_ERP_G; 69 70 /* device is expected to do this */ 71 if (sband->band == NL80211_BAND_S1GHZ) 72 return 0; 73 74 /* 75 * data and mgmt (except PS Poll): 76 * - during CFP: 32768 77 * - during contention period: 78 * if addr1 is group address: 0 79 * if more fragments = 0 and addr1 is individual address: time to 80 * transmit one ACK plus SIFS 81 * if more fragments = 1 and addr1 is individual address: time to 82 * transmit next fragment plus 2 x ACK plus 3 x SIFS 83 * 84 * IEEE 802.11, 9.6: 85 * - control response frame (CTS or ACK) shall be transmitted using the 86 * same rate as the immediately previous frame in the frame exchange 87 * sequence, if this rate belongs to the PHY mandatory rates, or else 88 * at the highest possible rate belonging to the PHY rates in the 89 * BSSBasicRateSet 90 */ 91 hdr = (struct ieee80211_hdr *)skb->data; 92 if (ieee80211_is_ctl(hdr->frame_control)) { 93 /* TODO: These control frames are not currently sent by 94 * mac80211, but should they be implemented, this function 95 * needs to be updated to support duration field calculation. 96 * 97 * RTS: time needed to transmit pending data/mgmt frame plus 98 * one CTS frame plus one ACK frame plus 3 x SIFS 99 * CTS: duration of immediately previous RTS minus time 100 * required to transmit CTS and its SIFS 101 * ACK: 0 if immediately previous directed data/mgmt had 102 * more=0, with more=1 duration in ACK frame is duration 103 * from previous frame minus time needed to transmit ACK 104 * and its SIFS 105 * PS Poll: BIT(15) | BIT(14) | aid 106 */ 107 return 0; 108 } 109 110 /* data/mgmt */ 111 if (0 /* FIX: data/mgmt during CFP */) 112 return cpu_to_le16(32768); 113 114 if (group_addr) /* Group address as the destination - no ACK */ 115 return 0; 116 117 /* Individual destination address: 118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 119 * CTS and ACK frames shall be transmitted using the highest rate in 120 * basic rate set that is less than or equal to the rate of the 121 * immediately previous frame and that is using the same modulation 122 * (CCK or OFDM). If no basic rate set matches with these requirements, 123 * the highest mandatory rate of the PHY that is less than or equal to 124 * the rate of the previous frame is used. 125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 126 */ 127 rate = -1; 128 /* use lowest available if everything fails */ 129 mrate = sband->bitrates[0].bitrate; 130 for (i = 0; i < sband->n_bitrates; i++) { 131 struct ieee80211_rate *r = &sband->bitrates[i]; 132 u32 flag; 133 134 if (r->bitrate > txrate->bitrate) 135 break; 136 137 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 138 rate = r->bitrate; 139 140 switch (sband->band) { 141 case NL80211_BAND_2GHZ: 142 case NL80211_BAND_LC: 143 if (tx->sdata->deflink.operating_11g_mode) 144 flag = IEEE80211_RATE_MANDATORY_G; 145 else 146 flag = IEEE80211_RATE_MANDATORY_B; 147 break; 148 case NL80211_BAND_5GHZ: 149 case NL80211_BAND_6GHZ: 150 flag = IEEE80211_RATE_MANDATORY_A; 151 break; 152 default: 153 flag = 0; 154 WARN_ON(1); 155 break; 156 } 157 158 if (r->flags & flag) 159 mrate = r->bitrate; 160 } 161 if (rate == -1) { 162 /* No matching basic rate found; use highest suitable mandatory 163 * PHY rate */ 164 rate = mrate; 165 } 166 167 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 168 if (ieee80211_is_data_qos(hdr->frame_control) && 169 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 170 dur = 0; 171 else 172 /* Time needed to transmit ACK 173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 174 * to closest integer */ 175 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 176 tx->sdata->vif.bss_conf.use_short_preamble); 177 178 if (next_frag_len) { 179 /* Frame is fragmented: duration increases with time needed to 180 * transmit next fragment plus ACK and 2 x SIFS. */ 181 dur *= 2; /* ACK + SIFS */ 182 /* next fragment */ 183 dur += ieee80211_frame_duration(sband->band, next_frag_len, 184 txrate->bitrate, erp, 185 tx->sdata->vif.bss_conf.use_short_preamble); 186 } 187 188 return cpu_to_le16(dur); 189 } 190 191 /* tx handlers */ 192 static ieee80211_tx_result debug_noinline 193 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 194 { 195 struct ieee80211_local *local = tx->local; 196 struct ieee80211_if_managed *ifmgd; 197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 198 199 /* driver doesn't support power save */ 200 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 201 return TX_CONTINUE; 202 203 /* hardware does dynamic power save */ 204 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 205 return TX_CONTINUE; 206 207 /* dynamic power save disabled */ 208 if (local->hw.conf.dynamic_ps_timeout <= 0) 209 return TX_CONTINUE; 210 211 /* we are scanning, don't enable power save */ 212 if (local->scanning) 213 return TX_CONTINUE; 214 215 if (!local->ps_sdata) 216 return TX_CONTINUE; 217 218 /* No point if we're going to suspend */ 219 if (local->quiescing) 220 return TX_CONTINUE; 221 222 /* dynamic ps is supported only in managed mode */ 223 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 224 return TX_CONTINUE; 225 226 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 227 return TX_CONTINUE; 228 229 ifmgd = &tx->sdata->u.mgd; 230 231 /* 232 * Don't wakeup from power save if u-apsd is enabled, voip ac has 233 * u-apsd enabled and the frame is in voip class. This effectively 234 * means that even if all access categories have u-apsd enabled, in 235 * practise u-apsd is only used with the voip ac. This is a 236 * workaround for the case when received voip class packets do not 237 * have correct qos tag for some reason, due the network or the 238 * peer application. 239 * 240 * Note: ifmgd->uapsd_queues access is racy here. If the value is 241 * changed via debugfs, user needs to reassociate manually to have 242 * everything in sync. 243 */ 244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 247 return TX_CONTINUE; 248 249 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 250 ieee80211_stop_queues_by_reason(&local->hw, 251 IEEE80211_MAX_QUEUE_MAP, 252 IEEE80211_QUEUE_STOP_REASON_PS, 253 false); 254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 255 wiphy_work_queue(local->hw.wiphy, 256 &local->dynamic_ps_disable_work); 257 } 258 259 /* Don't restart the timer if we're not disassociated */ 260 if (!ifmgd->associated) 261 return TX_CONTINUE; 262 263 mod_timer(&local->dynamic_ps_timer, jiffies + 264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 265 266 return TX_CONTINUE; 267 } 268 269 static ieee80211_tx_result debug_noinline 270 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 271 { 272 273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 275 bool assoc = false; 276 277 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 278 return TX_CONTINUE; 279 280 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 281 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 282 !ieee80211_is_probe_req(hdr->frame_control) && 283 !ieee80211_is_any_nullfunc(hdr->frame_control)) 284 /* 285 * When software scanning only nullfunc frames (to notify 286 * the sleep state to the AP) and probe requests (for the 287 * active scan) are allowed, all other frames should not be 288 * sent and we should not get here, but if we do 289 * nonetheless, drop them to avoid sending them 290 * off-channel. See __ieee80211_start_scan() for more. 291 */ 292 return TX_DROP; 293 294 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 295 return TX_CONTINUE; 296 297 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 298 return TX_CONTINUE; 299 300 if (tx->sta) 301 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 302 303 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 304 if (unlikely(!assoc && 305 ieee80211_is_data(hdr->frame_control))) { 306 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 307 sdata_info(tx->sdata, 308 "dropped data frame to not associated station %pM\n", 309 hdr->addr1); 310 #endif 311 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 312 return TX_DROP; 313 } 314 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 315 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 316 /* 317 * No associated STAs - no need to send multicast 318 * frames. 319 */ 320 return TX_DROP; 321 } 322 323 return TX_CONTINUE; 324 } 325 326 /* This function is called whenever the AP is about to exceed the maximum limit 327 * of buffered frames for power saving STAs. This situation should not really 328 * happen often during normal operation, so dropping the oldest buffered packet 329 * from each queue should be OK to make some room for new frames. */ 330 static void purge_old_ps_buffers(struct ieee80211_local *local) 331 { 332 int total = 0, purged = 0; 333 struct sk_buff *skb; 334 struct ieee80211_sub_if_data *sdata; 335 struct sta_info *sta; 336 337 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 338 struct ps_data *ps; 339 340 if (sdata->vif.type == NL80211_IFTYPE_AP) 341 ps = &sdata->u.ap.ps; 342 else if (ieee80211_vif_is_mesh(&sdata->vif)) 343 ps = &sdata->u.mesh.ps; 344 else 345 continue; 346 347 skb = skb_dequeue(&ps->bc_buf); 348 if (skb) { 349 purged++; 350 ieee80211_free_txskb(&local->hw, skb); 351 } 352 total += skb_queue_len(&ps->bc_buf); 353 } 354 355 /* 356 * Drop one frame from each station from the lowest-priority 357 * AC that has frames at all. 358 */ 359 list_for_each_entry_rcu(sta, &local->sta_list, list) { 360 int ac; 361 362 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 363 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 364 total += skb_queue_len(&sta->ps_tx_buf[ac]); 365 if (skb) { 366 purged++; 367 ieee80211_free_txskb(&local->hw, skb); 368 break; 369 } 370 } 371 } 372 373 local->total_ps_buffered = total; 374 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 375 } 376 377 static ieee80211_tx_result 378 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 379 { 380 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 381 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 382 struct ps_data *ps; 383 384 /* 385 * broadcast/multicast frame 386 * 387 * If any of the associated/peer stations is in power save mode, 388 * the frame is buffered to be sent after DTIM beacon frame. 389 * This is done either by the hardware or us. 390 */ 391 392 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 393 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 394 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 395 if (!tx->sdata->bss) 396 return TX_CONTINUE; 397 398 ps = &tx->sdata->bss->ps; 399 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 400 ps = &tx->sdata->u.mesh.ps; 401 } else { 402 return TX_CONTINUE; 403 } 404 405 406 /* no buffering for ordered frames */ 407 if (ieee80211_has_order(hdr->frame_control)) 408 return TX_CONTINUE; 409 410 if (ieee80211_is_probe_req(hdr->frame_control)) 411 return TX_CONTINUE; 412 413 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 414 info->hw_queue = tx->sdata->vif.cab_queue; 415 416 /* no stations in PS mode and no buffered packets */ 417 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 418 return TX_CONTINUE; 419 420 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 421 422 /* device releases frame after DTIM beacon */ 423 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 424 return TX_CONTINUE; 425 426 /* buffered in mac80211 */ 427 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 428 purge_old_ps_buffers(tx->local); 429 430 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 431 ps_dbg(tx->sdata, 432 "BC TX buffer full - dropping the oldest frame\n"); 433 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 434 } else 435 tx->local->total_ps_buffered++; 436 437 skb_queue_tail(&ps->bc_buf, tx->skb); 438 439 return TX_QUEUED; 440 } 441 442 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 443 struct sk_buff *skb) 444 { 445 if (!ieee80211_is_mgmt(fc)) 446 return 0; 447 448 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 449 return 0; 450 451 if (!ieee80211_is_robust_mgmt_frame(skb)) 452 return 0; 453 454 return 1; 455 } 456 457 static ieee80211_tx_result 458 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 459 { 460 struct sta_info *sta = tx->sta; 461 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 462 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 463 struct ieee80211_local *local = tx->local; 464 465 if (unlikely(!sta)) 466 return TX_CONTINUE; 467 468 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 469 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 470 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 471 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 472 int ac = skb_get_queue_mapping(tx->skb); 473 474 if (ieee80211_is_mgmt(hdr->frame_control) && 475 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 476 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 477 return TX_CONTINUE; 478 } 479 480 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 481 sta->sta.addr, sta->sta.aid, ac); 482 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 483 purge_old_ps_buffers(tx->local); 484 485 /* sync with ieee80211_sta_ps_deliver_wakeup */ 486 spin_lock(&sta->ps_lock); 487 /* 488 * STA woke up the meantime and all the frames on ps_tx_buf have 489 * been queued to pending queue. No reordering can happen, go 490 * ahead and Tx the packet. 491 */ 492 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 493 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 494 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 495 spin_unlock(&sta->ps_lock); 496 return TX_CONTINUE; 497 } 498 499 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 500 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 501 ps_dbg(tx->sdata, 502 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 503 sta->sta.addr, ac); 504 ieee80211_free_txskb(&local->hw, old); 505 } else 506 tx->local->total_ps_buffered++; 507 508 info->control.jiffies = jiffies; 509 info->control.vif = &tx->sdata->vif; 510 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 511 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 512 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 513 spin_unlock(&sta->ps_lock); 514 515 if (!timer_pending(&local->sta_cleanup)) 516 mod_timer(&local->sta_cleanup, 517 round_jiffies(jiffies + 518 STA_INFO_CLEANUP_INTERVAL)); 519 520 /* 521 * We queued up some frames, so the TIM bit might 522 * need to be set, recalculate it. 523 */ 524 sta_info_recalc_tim(sta); 525 526 return TX_QUEUED; 527 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 528 ps_dbg(tx->sdata, 529 "STA %pM in PS mode, but polling/in SP -> send frame\n", 530 sta->sta.addr); 531 } 532 533 return TX_CONTINUE; 534 } 535 536 static ieee80211_tx_result debug_noinline 537 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 538 { 539 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 540 return TX_CONTINUE; 541 542 if (tx->flags & IEEE80211_TX_UNICAST) 543 return ieee80211_tx_h_unicast_ps_buf(tx); 544 else 545 return ieee80211_tx_h_multicast_ps_buf(tx); 546 } 547 548 static ieee80211_tx_result debug_noinline 549 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 550 { 551 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 552 553 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 554 if (tx->sdata->control_port_no_encrypt) 555 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 556 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 557 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 558 } 559 560 return TX_CONTINUE; 561 } 562 563 static struct ieee80211_key * 564 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 565 { 566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 struct ieee80211_link_data *link; 569 unsigned int link_id; 570 571 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 572 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 573 link = &tx->sdata->deflink; 574 } else { 575 link = rcu_dereference(tx->sdata->link[link_id]); 576 if (!link) 577 return NULL; 578 } 579 580 if (ieee80211_is_group_privacy_action(tx->skb)) 581 return rcu_dereference(link->default_multicast_key); 582 else if (ieee80211_is_mgmt(hdr->frame_control) && 583 is_multicast_ether_addr(hdr->addr1) && 584 ieee80211_is_robust_mgmt_frame(tx->skb)) 585 return rcu_dereference(link->default_mgmt_key); 586 else if (is_multicast_ether_addr(hdr->addr1)) 587 return rcu_dereference(link->default_multicast_key); 588 589 return NULL; 590 } 591 592 static ieee80211_tx_result debug_noinline 593 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 594 { 595 struct ieee80211_key *key; 596 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 597 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 598 599 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 600 tx->key = NULL; 601 return TX_CONTINUE; 602 } 603 604 if (tx->sta && 605 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 606 tx->key = key; 607 else if ((key = ieee80211_select_link_key(tx))) 608 tx->key = key; 609 else if (!is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_unicast_key))) 611 tx->key = key; 612 else 613 tx->key = NULL; 614 615 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 616 if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 617 info->control.hw_key = &tx->key->conf; 618 return TX_CONTINUE; 619 } 620 621 if (tx->key) { 622 bool skip_hw = false; 623 624 /* TODO: add threshold stuff again */ 625 626 switch (tx->key->conf.cipher) { 627 case WLAN_CIPHER_SUITE_WEP40: 628 case WLAN_CIPHER_SUITE_WEP104: 629 case WLAN_CIPHER_SUITE_TKIP: 630 if (!ieee80211_is_data_present(hdr->frame_control)) 631 tx->key = NULL; 632 break; 633 case WLAN_CIPHER_SUITE_CCMP: 634 case WLAN_CIPHER_SUITE_CCMP_256: 635 case WLAN_CIPHER_SUITE_GCMP: 636 case WLAN_CIPHER_SUITE_GCMP_256: 637 if (!ieee80211_is_data_present(hdr->frame_control) && 638 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 639 tx->skb) && 640 !ieee80211_is_group_privacy_action(tx->skb) && 641 !ieee80211_require_encrypted_assoc(hdr->frame_control, 642 tx->sta)) 643 tx->key = NULL; 644 else 645 skip_hw = (tx->key->conf.flags & 646 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 647 ieee80211_is_mgmt(hdr->frame_control); 648 break; 649 case WLAN_CIPHER_SUITE_AES_CMAC: 650 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 651 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 652 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 653 if (!ieee80211_is_mgmt(hdr->frame_control)) 654 tx->key = NULL; 655 break; 656 } 657 658 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 659 !ieee80211_is_deauth(hdr->frame_control)) && 660 tx->skb->protocol != tx->sdata->control_port_protocol) 661 return TX_DROP; 662 663 if (!skip_hw && tx->key && 664 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 665 info->control.hw_key = &tx->key->conf; 666 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 667 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 668 return TX_DROP; 669 } 670 671 return TX_CONTINUE; 672 } 673 674 static ieee80211_tx_result debug_noinline 675 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 676 { 677 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 678 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 679 struct ieee80211_supported_band *sband; 680 u32 len; 681 struct ieee80211_tx_rate_control txrc; 682 struct ieee80211_sta_rates *ratetbl = NULL; 683 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 684 bool assoc = false; 685 686 memset(&txrc, 0, sizeof(txrc)); 687 688 if (info->band < NUM_NL80211_BANDS) 689 sband = tx->local->hw.wiphy->bands[info->band]; 690 else 691 return TX_CONTINUE; 692 693 len = min_t(u32, tx->skb->len + FCS_LEN, 694 tx->local->hw.wiphy->frag_threshold); 695 696 /* set up the tx rate control struct we give the RC algo */ 697 txrc.hw = &tx->local->hw; 698 txrc.sband = sband; 699 txrc.bss_conf = &tx->sdata->vif.bss_conf; 700 txrc.skb = tx->skb; 701 txrc.reported_rate.idx = -1; 702 703 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 704 txrc.rate_idx_mask = ~0; 705 } else { 706 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 707 708 if (tx->sdata->rc_has_mcs_mask[info->band]) 709 txrc.rate_idx_mcs_mask = 710 tx->sdata->rc_rateidx_mcs_mask[info->band]; 711 } 712 713 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 714 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 715 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 716 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 717 718 /* set up RTS protection if desired */ 719 if (len > tx->local->hw.wiphy->rts_threshold) { 720 txrc.rts = true; 721 } 722 723 info->control.use_rts = txrc.rts; 724 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 725 726 /* 727 * Use short preamble if the BSS can handle it, but not for 728 * management frames unless we know the receiver can handle 729 * that -- the management frame might be to a station that 730 * just wants a probe response. 731 */ 732 if (tx->sdata->vif.bss_conf.use_short_preamble && 733 (ieee80211_is_tx_data(tx->skb) || 734 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 735 txrc.short_preamble = true; 736 737 info->control.short_preamble = txrc.short_preamble; 738 739 /* don't ask rate control when rate already injected via radiotap */ 740 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 741 return TX_CONTINUE; 742 743 if (tx->sta) 744 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 745 746 /* 747 * Lets not bother rate control if we're associated and cannot 748 * talk to the sta. This should not happen. 749 */ 750 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 751 !rate_usable_index_exists(sband, &tx->sta->sta), 752 "%s: Dropped data frame as no usable bitrate found while " 753 "scanning and associated. Target station: " 754 "%pM on %d GHz band\n", 755 tx->sdata->name, 756 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 757 info->band ? 5 : 2)) 758 return TX_DROP; 759 760 /* 761 * If we're associated with the sta at this point we know we can at 762 * least send the frame at the lowest bit rate. 763 */ 764 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 765 766 if (tx->sta && !info->control.skip_table) 767 ratetbl = rcu_dereference(tx->sta->sta.rates); 768 769 if (unlikely(info->control.rates[0].idx < 0)) { 770 if (ratetbl) { 771 struct ieee80211_tx_rate rate = { 772 .idx = ratetbl->rate[0].idx, 773 .flags = ratetbl->rate[0].flags, 774 .count = ratetbl->rate[0].count 775 }; 776 777 if (ratetbl->rate[0].idx < 0) 778 return TX_DROP; 779 780 tx->rate = rate; 781 } else { 782 return TX_DROP; 783 } 784 } else { 785 tx->rate = info->control.rates[0]; 786 } 787 788 if (txrc.reported_rate.idx < 0) { 789 txrc.reported_rate = tx->rate; 790 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 791 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 792 } else if (tx->sta) 793 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 794 795 if (ratetbl) 796 return TX_CONTINUE; 797 798 if (unlikely(!info->control.rates[0].count)) 799 info->control.rates[0].count = 1; 800 801 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 802 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 803 info->control.rates[0].count = 1; 804 805 return TX_CONTINUE; 806 } 807 808 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 809 { 810 u16 *seq = &sta->tid_seq[tid]; 811 __le16 ret = cpu_to_le16(*seq); 812 813 /* Increase the sequence number. */ 814 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 815 816 return ret; 817 } 818 819 static ieee80211_tx_result debug_noinline 820 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 821 { 822 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 824 int tid; 825 826 /* 827 * Packet injection may want to control the sequence 828 * number, if we have no matching interface then we 829 * neither assign one ourselves nor ask the driver to. 830 */ 831 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 832 return TX_CONTINUE; 833 834 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 835 return TX_CONTINUE; 836 837 if (ieee80211_hdrlen(hdr->frame_control) < 24) 838 return TX_CONTINUE; 839 840 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 841 return TX_CONTINUE; 842 843 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 844 return TX_CONTINUE; 845 846 /* SNS11 from 802.11be 10.3.2.14 */ 847 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 848 ieee80211_vif_is_mld(info->control.vif) && 849 info->control.vif->type == NL80211_IFTYPE_AP)) { 850 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 851 tx->sdata->mld_mcast_seq += 0x10; 852 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 853 return TX_CONTINUE; 854 } 855 856 /* 857 * Anything but QoS data that has a sequence number field 858 * (is long enough) gets a sequence number from the global 859 * counter. QoS data frames with a multicast destination 860 * also use the global counter (802.11-2012 9.3.2.10). 861 */ 862 if (!ieee80211_is_data_qos(hdr->frame_control) || 863 is_multicast_ether_addr(hdr->addr1)) { 864 /* driver should assign sequence number */ 865 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 866 /* for pure STA mode without beacons, we can do it */ 867 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 868 tx->sdata->sequence_number += 0x10; 869 if (tx->sta) 870 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 871 return TX_CONTINUE; 872 } 873 874 /* 875 * This should be true for injected/management frames only, for 876 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 877 * above since they are not QoS-data frames. 878 */ 879 if (!tx->sta) 880 return TX_CONTINUE; 881 882 /* include per-STA, per-TID sequence counter */ 883 tid = ieee80211_get_tid(hdr); 884 tx->sta->deflink.tx_stats.msdu[tid]++; 885 886 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 887 888 return TX_CONTINUE; 889 } 890 891 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 892 struct sk_buff *skb, int hdrlen, 893 int frag_threshold) 894 { 895 struct ieee80211_local *local = tx->local; 896 struct ieee80211_tx_info *info; 897 struct sk_buff *tmp; 898 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 899 int pos = hdrlen + per_fragm; 900 int rem = skb->len - hdrlen - per_fragm; 901 902 if (WARN_ON(rem < 0)) 903 return -EINVAL; 904 905 /* first fragment was already added to queue by caller */ 906 907 while (rem) { 908 int fraglen = per_fragm; 909 910 if (fraglen > rem) 911 fraglen = rem; 912 rem -= fraglen; 913 tmp = dev_alloc_skb(local->tx_headroom + 914 frag_threshold + 915 IEEE80211_ENCRYPT_HEADROOM + 916 IEEE80211_ENCRYPT_TAILROOM); 917 if (!tmp) 918 return -ENOMEM; 919 920 __skb_queue_tail(&tx->skbs, tmp); 921 922 skb_reserve(tmp, 923 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 924 925 /* copy control information */ 926 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 927 928 info = IEEE80211_SKB_CB(tmp); 929 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 930 IEEE80211_TX_CTL_FIRST_FRAGMENT); 931 932 if (rem) 933 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 934 935 skb_copy_queue_mapping(tmp, skb); 936 tmp->priority = skb->priority; 937 tmp->dev = skb->dev; 938 939 /* copy header and data */ 940 skb_put_data(tmp, skb->data, hdrlen); 941 skb_put_data(tmp, skb->data + pos, fraglen); 942 943 pos += fraglen; 944 } 945 946 /* adjust first fragment's length */ 947 skb_trim(skb, hdrlen + per_fragm); 948 return 0; 949 } 950 951 static ieee80211_tx_result debug_noinline 952 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 953 { 954 struct sk_buff *skb = tx->skb; 955 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 956 struct ieee80211_hdr *hdr = (void *)skb->data; 957 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 958 int hdrlen; 959 int fragnum; 960 961 /* no matter what happens, tx->skb moves to tx->skbs */ 962 __skb_queue_tail(&tx->skbs, skb); 963 tx->skb = NULL; 964 965 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 966 return TX_CONTINUE; 967 968 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 969 return TX_CONTINUE; 970 971 /* 972 * Warn when submitting a fragmented A-MPDU frame and drop it. 973 * This scenario is handled in ieee80211_tx_prepare but extra 974 * caution taken here as fragmented ampdu may cause Tx stop. 975 */ 976 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 977 return TX_DROP; 978 979 hdrlen = ieee80211_hdrlen(hdr->frame_control); 980 981 /* internal error, why isn't DONTFRAG set? */ 982 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 983 return TX_DROP; 984 985 /* 986 * Now fragment the frame. This will allocate all the fragments and 987 * chain them (using skb as the first fragment) to skb->next. 988 * During transmission, we will remove the successfully transmitted 989 * fragments from this list. When the low-level driver rejects one 990 * of the fragments then we will simply pretend to accept the skb 991 * but store it away as pending. 992 */ 993 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 994 return TX_DROP; 995 996 /* update duration/seq/flags of fragments */ 997 fragnum = 0; 998 999 skb_queue_walk(&tx->skbs, skb) { 1000 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1001 1002 hdr = (void *)skb->data; 1003 info = IEEE80211_SKB_CB(skb); 1004 1005 if (!skb_queue_is_last(&tx->skbs, skb)) { 1006 hdr->frame_control |= morefrags; 1007 /* 1008 * No multi-rate retries for fragmented frames, that 1009 * would completely throw off the NAV at other STAs. 1010 */ 1011 info->control.rates[1].idx = -1; 1012 info->control.rates[2].idx = -1; 1013 info->control.rates[3].idx = -1; 1014 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1015 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1016 } else { 1017 hdr->frame_control &= ~morefrags; 1018 } 1019 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1020 fragnum++; 1021 } 1022 1023 return TX_CONTINUE; 1024 } 1025 1026 static ieee80211_tx_result debug_noinline 1027 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1028 { 1029 struct sk_buff *skb; 1030 int ac = -1; 1031 1032 if (!tx->sta) 1033 return TX_CONTINUE; 1034 1035 skb_queue_walk(&tx->skbs, skb) { 1036 ac = skb_get_queue_mapping(skb); 1037 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1038 } 1039 if (ac >= 0) 1040 tx->sta->deflink.tx_stats.packets[ac]++; 1041 1042 return TX_CONTINUE; 1043 } 1044 1045 static ieee80211_tx_result debug_noinline 1046 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1047 { 1048 if (!tx->key) 1049 return TX_CONTINUE; 1050 1051 switch (tx->key->conf.cipher) { 1052 case WLAN_CIPHER_SUITE_WEP40: 1053 case WLAN_CIPHER_SUITE_WEP104: 1054 return ieee80211_crypto_wep_encrypt(tx); 1055 case WLAN_CIPHER_SUITE_TKIP: 1056 return ieee80211_crypto_tkip_encrypt(tx); 1057 case WLAN_CIPHER_SUITE_CCMP: 1058 return ieee80211_crypto_ccmp_encrypt( 1059 tx, IEEE80211_CCMP_MIC_LEN); 1060 case WLAN_CIPHER_SUITE_CCMP_256: 1061 return ieee80211_crypto_ccmp_encrypt( 1062 tx, IEEE80211_CCMP_256_MIC_LEN); 1063 case WLAN_CIPHER_SUITE_AES_CMAC: 1064 return ieee80211_crypto_aes_cmac_encrypt( 1065 tx, IEEE80211_CMAC_128_MIC_LEN); 1066 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1067 return ieee80211_crypto_aes_cmac_encrypt( 1068 tx, IEEE80211_CMAC_256_MIC_LEN); 1069 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1070 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1071 return ieee80211_crypto_aes_gmac_encrypt(tx); 1072 case WLAN_CIPHER_SUITE_GCMP: 1073 case WLAN_CIPHER_SUITE_GCMP_256: 1074 return ieee80211_crypto_gcmp_encrypt(tx); 1075 } 1076 1077 return TX_DROP; 1078 } 1079 1080 static ieee80211_tx_result debug_noinline 1081 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1082 { 1083 struct sk_buff *skb; 1084 struct ieee80211_hdr *hdr; 1085 int next_len; 1086 bool group_addr; 1087 1088 skb_queue_walk(&tx->skbs, skb) { 1089 hdr = (void *) skb->data; 1090 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1091 break; /* must not overwrite AID */ 1092 if (!skb_queue_is_last(&tx->skbs, skb)) { 1093 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1094 next_len = next->len; 1095 } else 1096 next_len = 0; 1097 group_addr = is_multicast_ether_addr(hdr->addr1); 1098 1099 hdr->duration_id = 1100 ieee80211_duration(tx, skb, group_addr, next_len); 1101 } 1102 1103 return TX_CONTINUE; 1104 } 1105 1106 /* actual transmit path */ 1107 1108 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1109 struct sk_buff *skb, 1110 struct ieee80211_tx_info *info, 1111 struct tid_ampdu_tx *tid_tx, 1112 int tid) 1113 { 1114 bool queued = false; 1115 bool reset_agg_timer = false; 1116 struct sk_buff *purge_skb = NULL; 1117 1118 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1119 reset_agg_timer = true; 1120 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1121 /* 1122 * nothing -- this aggregation session is being started 1123 * but that might still fail with the driver 1124 */ 1125 } else if (!tx->sta->sta.txq[tid]) { 1126 spin_lock(&tx->sta->lock); 1127 /* 1128 * Need to re-check now, because we may get here 1129 * 1130 * 1) in the window during which the setup is actually 1131 * already done, but not marked yet because not all 1132 * packets are spliced over to the driver pending 1133 * queue yet -- if this happened we acquire the lock 1134 * either before or after the splice happens, but 1135 * need to recheck which of these cases happened. 1136 * 1137 * 2) during session teardown, if the OPERATIONAL bit 1138 * was cleared due to the teardown but the pointer 1139 * hasn't been assigned NULL yet (or we loaded it 1140 * before it was assigned) -- in this case it may 1141 * now be NULL which means we should just let the 1142 * packet pass through because splicing the frames 1143 * back is already done. 1144 */ 1145 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1146 1147 if (!tid_tx) { 1148 /* do nothing, let packet pass through */ 1149 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1150 reset_agg_timer = true; 1151 } else { 1152 queued = true; 1153 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1154 clear_sta_flag(tx->sta, WLAN_STA_SP); 1155 ps_dbg(tx->sta->sdata, 1156 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1157 tx->sta->sta.addr, tx->sta->sta.aid); 1158 } 1159 info->control.vif = &tx->sdata->vif; 1160 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1161 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1162 __skb_queue_tail(&tid_tx->pending, skb); 1163 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1164 purge_skb = __skb_dequeue(&tid_tx->pending); 1165 } 1166 spin_unlock(&tx->sta->lock); 1167 1168 if (purge_skb) 1169 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1170 } 1171 1172 /* reset session timer */ 1173 if (reset_agg_timer) 1174 tid_tx->last_tx = jiffies; 1175 1176 return queued; 1177 } 1178 1179 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1180 struct sta_info *sta, struct sk_buff *skb) 1181 { 1182 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1183 u16 tid; 1184 1185 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1186 return; 1187 1188 if (!sta || 1189 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1190 !sta->sta.deflink.s1g_cap.s1g) || 1191 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1192 skb->protocol == sdata->control_port_protocol) 1193 return; 1194 1195 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1196 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1197 return; 1198 1199 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1200 } 1201 1202 /* 1203 * initialises @tx 1204 * pass %NULL for the station if unknown, a valid pointer if known 1205 * or an ERR_PTR() if the station is known not to exist 1206 */ 1207 static ieee80211_tx_result 1208 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1209 struct ieee80211_tx_data *tx, 1210 struct sta_info *sta, struct sk_buff *skb) 1211 { 1212 struct ieee80211_local *local = sdata->local; 1213 struct ieee80211_hdr *hdr; 1214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1215 bool aggr_check = false; 1216 int tid; 1217 1218 memset(tx, 0, sizeof(*tx)); 1219 tx->skb = skb; 1220 tx->local = local; 1221 tx->sdata = sdata; 1222 __skb_queue_head_init(&tx->skbs); 1223 1224 /* 1225 * If this flag is set to true anywhere, and we get here, 1226 * we are doing the needed processing, so remove the flag 1227 * now. 1228 */ 1229 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1230 1231 hdr = (struct ieee80211_hdr *) skb->data; 1232 1233 if (likely(sta)) { 1234 if (!IS_ERR(sta)) 1235 tx->sta = sta; 1236 } else { 1237 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1238 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1239 if (!tx->sta && sdata->wdev.use_4addr) 1240 return TX_DROP; 1241 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1242 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1243 } 1244 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1245 tx->sta = sta_info_get(sdata, hdr->addr1); 1246 aggr_check = true; 1247 } 1248 } 1249 1250 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1251 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1252 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1253 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1254 struct tid_ampdu_tx *tid_tx; 1255 1256 tid = ieee80211_get_tid(hdr); 1257 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1258 if (!tid_tx && aggr_check) { 1259 ieee80211_aggr_check(sdata, tx->sta, skb); 1260 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1261 } 1262 1263 if (tid_tx) { 1264 bool queued; 1265 1266 queued = ieee80211_tx_prep_agg(tx, skb, info, 1267 tid_tx, tid); 1268 1269 if (unlikely(queued)) 1270 return TX_QUEUED; 1271 } 1272 } 1273 1274 if (is_multicast_ether_addr(hdr->addr1)) { 1275 tx->flags &= ~IEEE80211_TX_UNICAST; 1276 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1277 } else 1278 tx->flags |= IEEE80211_TX_UNICAST; 1279 1280 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1281 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1282 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1283 info->flags & IEEE80211_TX_CTL_AMPDU) 1284 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1285 } 1286 1287 if (!tx->sta) 1288 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1289 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1290 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1291 ieee80211_check_fast_xmit(tx->sta); 1292 } 1293 1294 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1295 1296 return TX_CONTINUE; 1297 } 1298 1299 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1300 struct ieee80211_vif *vif, 1301 struct sta_info *sta, 1302 struct sk_buff *skb) 1303 { 1304 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1305 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1306 struct ieee80211_txq *txq = NULL; 1307 1308 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1309 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1310 return NULL; 1311 1312 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1313 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1314 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1315 ieee80211_is_bufferable_mmpdu(skb) || 1316 vif->type == NL80211_IFTYPE_STATION || 1317 vif->type == NL80211_IFTYPE_NAN || 1318 vif->type == NL80211_IFTYPE_NAN_DATA) && 1319 sta && sta->uploaded) { 1320 /* 1321 * This will be NULL if the driver didn't set the 1322 * opt-in hardware flag. 1323 */ 1324 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1325 } else if ((!ieee80211_is_mgmt(hdr->frame_control) || 1326 ieee80211_is_bufferable_mmpdu(skb)) && 1327 !sta) { 1328 txq = vif->txq_mgmt; 1329 } 1330 } else if (sta) { 1331 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1332 1333 if (!sta->uploaded) 1334 return NULL; 1335 1336 txq = sta->sta.txq[tid]; 1337 } else { 1338 txq = vif->txq; 1339 } 1340 1341 if (!txq) 1342 return NULL; 1343 1344 return to_txq_info(txq); 1345 } 1346 1347 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1348 { 1349 struct sk_buff *next; 1350 codel_time_t now = codel_get_time(); 1351 1352 skb_list_walk_safe(skb, skb, next) 1353 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1354 } 1355 1356 static u32 codel_skb_len_func(const struct sk_buff *skb) 1357 { 1358 return skb->len; 1359 } 1360 1361 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1362 { 1363 const struct ieee80211_tx_info *info; 1364 1365 info = (const struct ieee80211_tx_info *)skb->cb; 1366 return info->control.enqueue_time; 1367 } 1368 1369 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1370 void *ctx) 1371 { 1372 struct ieee80211_local *local; 1373 struct txq_info *txqi; 1374 struct fq *fq; 1375 struct fq_flow *flow; 1376 1377 txqi = ctx; 1378 local = vif_to_sdata(txqi->txq.vif)->local; 1379 fq = &local->fq; 1380 1381 if (cvars == &txqi->def_cvars) 1382 flow = &txqi->tin.default_flow; 1383 else 1384 flow = &fq->flows[cvars - local->cvars]; 1385 1386 return fq_flow_dequeue(fq, flow); 1387 } 1388 1389 static void codel_drop_func(struct sk_buff *skb, 1390 void *ctx) 1391 { 1392 struct ieee80211_local *local; 1393 struct ieee80211_hw *hw; 1394 struct txq_info *txqi; 1395 1396 txqi = ctx; 1397 local = vif_to_sdata(txqi->txq.vif)->local; 1398 hw = &local->hw; 1399 1400 ieee80211_free_txskb(hw, skb); 1401 } 1402 1403 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1404 struct fq_tin *tin, 1405 struct fq_flow *flow) 1406 { 1407 struct ieee80211_local *local; 1408 struct txq_info *txqi; 1409 struct codel_vars *cvars; 1410 struct codel_params *cparams; 1411 struct codel_stats *cstats; 1412 1413 local = container_of(fq, struct ieee80211_local, fq); 1414 txqi = container_of(tin, struct txq_info, tin); 1415 cparams = &local->cparams; 1416 cstats = &txqi->cstats; 1417 1418 if (flow == &tin->default_flow) 1419 cvars = &txqi->def_cvars; 1420 else 1421 cvars = &local->cvars[flow - fq->flows]; 1422 1423 return codel_dequeue(txqi, 1424 &flow->backlog, 1425 cparams, 1426 cvars, 1427 cstats, 1428 codel_skb_len_func, 1429 codel_skb_time_func, 1430 codel_drop_func, 1431 codel_dequeue_func); 1432 } 1433 1434 static void fq_skb_free_func(struct fq *fq, 1435 struct fq_tin *tin, 1436 struct fq_flow *flow, 1437 struct sk_buff *skb) 1438 { 1439 struct ieee80211_local *local; 1440 1441 local = container_of(fq, struct ieee80211_local, fq); 1442 ieee80211_free_txskb(&local->hw, skb); 1443 } 1444 1445 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1446 struct txq_info *txqi, 1447 struct sk_buff *skb) 1448 { 1449 struct fq *fq = &local->fq; 1450 struct fq_tin *tin = &txqi->tin; 1451 u32 flow_idx; 1452 1453 ieee80211_set_skb_enqueue_time(skb); 1454 1455 spin_lock_bh(&fq->lock); 1456 /* 1457 * For management frames, don't really apply codel etc., 1458 * we don't want to apply any shaping or anything we just 1459 * want to simplify the driver API by having them on the 1460 * txqi. 1461 */ 1462 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1463 IEEE80211_SKB_CB(skb)->control.flags |= 1464 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1465 __skb_queue_tail(&txqi->frags, skb); 1466 } else { 1467 flow_idx = fq_flow_idx(fq, skb); 1468 fq_tin_enqueue(fq, tin, flow_idx, skb, 1469 fq_skb_free_func); 1470 } 1471 spin_unlock_bh(&fq->lock); 1472 } 1473 1474 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1475 struct fq_flow *flow, struct sk_buff *skb, 1476 void *data) 1477 { 1478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1479 1480 return info->control.vif == data; 1481 } 1482 1483 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1484 struct ieee80211_sub_if_data *sdata) 1485 { 1486 struct fq *fq = &local->fq; 1487 struct txq_info *txqi; 1488 struct fq_tin *tin; 1489 struct ieee80211_sub_if_data *ap; 1490 1491 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1492 return; 1493 1494 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1495 1496 if (!ap->vif.txq) 1497 return; 1498 1499 txqi = to_txq_info(ap->vif.txq); 1500 tin = &txqi->tin; 1501 1502 spin_lock_bh(&fq->lock); 1503 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1504 fq_skb_free_func); 1505 spin_unlock_bh(&fq->lock); 1506 } 1507 1508 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1509 struct sta_info *sta, 1510 struct txq_info *txqi, int tid) 1511 { 1512 fq_tin_init(&txqi->tin); 1513 codel_vars_init(&txqi->def_cvars); 1514 codel_stats_init(&txqi->cstats); 1515 __skb_queue_head_init(&txqi->frags); 1516 INIT_LIST_HEAD(&txqi->schedule_order); 1517 1518 txqi->txq.vif = &sdata->vif; 1519 1520 if (!sta) { 1521 txqi->txq.tid = tid; 1522 1523 if (tid == IEEE80211_NUM_TIDS) { 1524 sdata->vif.txq_mgmt = &txqi->txq; 1525 txqi->txq.ac = IEEE80211_AC_VO; 1526 } else { 1527 sdata->vif.txq = &txqi->txq; 1528 txqi->txq.ac = IEEE80211_AC_BE; 1529 } 1530 1531 return; 1532 } 1533 1534 if (tid == IEEE80211_NUM_TIDS) { 1535 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1536 /* Drivers need to opt in to the management MPDU TXQ */ 1537 if (!ieee80211_hw_check(&sdata->local->hw, 1538 STA_MMPDU_TXQ)) 1539 return; 1540 } else if (!ieee80211_hw_check(&sdata->local->hw, 1541 BUFF_MMPDU_TXQ)) { 1542 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1543 return; 1544 } 1545 txqi->txq.ac = IEEE80211_AC_VO; 1546 } else { 1547 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1548 } 1549 1550 txqi->txq.sta = &sta->sta; 1551 txqi->txq.tid = tid; 1552 sta->sta.txq[tid] = &txqi->txq; 1553 } 1554 1555 void ieee80211_txq_purge(struct ieee80211_local *local, 1556 struct txq_info *txqi) 1557 { 1558 struct fq *fq = &local->fq; 1559 struct fq_tin *tin = &txqi->tin; 1560 1561 spin_lock_bh(&fq->lock); 1562 fq_tin_reset(fq, tin, fq_skb_free_func); 1563 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1564 spin_unlock_bh(&fq->lock); 1565 1566 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1567 list_del_init(&txqi->schedule_order); 1568 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1569 } 1570 1571 void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx) 1572 { 1573 if (local->hw.wiphy->txq_limit) 1574 local->fq.limit = local->hw.wiphy->txq_limit; 1575 else 1576 local->hw.wiphy->txq_limit = local->fq.limit; 1577 1578 if (local->hw.wiphy->txq_memory_limit) 1579 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1580 else 1581 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1582 1583 if (local->hw.wiphy->txq_quantum) 1584 local->fq.quantum = local->hw.wiphy->txq_quantum; 1585 else 1586 local->hw.wiphy->txq_quantum = local->fq.quantum; 1587 } 1588 1589 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1590 { 1591 struct fq *fq = &local->fq; 1592 int ret; 1593 int i; 1594 bool supp_vht = false; 1595 enum nl80211_band band; 1596 1597 ret = fq_init(fq, 4096); 1598 if (ret) 1599 return ret; 1600 1601 /* 1602 * If the hardware doesn't support VHT, it is safe to limit the maximum 1603 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1604 */ 1605 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1606 struct ieee80211_supported_band *sband; 1607 1608 sband = local->hw.wiphy->bands[band]; 1609 if (!sband) 1610 continue; 1611 1612 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1613 } 1614 1615 if (!supp_vht) 1616 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1617 1618 codel_params_init(&local->cparams); 1619 local->cparams.interval = MS2TIME(100); 1620 local->cparams.target = MS2TIME(20); 1621 local->cparams.ecn = true; 1622 1623 local->cvars = kvzalloc_objs(local->cvars[0], fq->flows_cnt); 1624 if (!local->cvars) { 1625 spin_lock_bh(&fq->lock); 1626 fq_reset(fq, fq_skb_free_func); 1627 spin_unlock_bh(&fq->lock); 1628 return -ENOMEM; 1629 } 1630 1631 for (i = 0; i < fq->flows_cnt; i++) 1632 codel_vars_init(&local->cvars[i]); 1633 1634 ieee80211_txq_set_params(local, -1); 1635 1636 return 0; 1637 } 1638 1639 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1640 { 1641 struct fq *fq = &local->fq; 1642 1643 kvfree(local->cvars); 1644 local->cvars = NULL; 1645 1646 spin_lock_bh(&fq->lock); 1647 fq_reset(fq, fq_skb_free_func); 1648 spin_unlock_bh(&fq->lock); 1649 } 1650 1651 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1652 struct ieee80211_sub_if_data *sdata, 1653 struct sta_info *sta, 1654 struct sk_buff *skb) 1655 { 1656 struct ieee80211_vif *vif; 1657 struct txq_info *txqi; 1658 1659 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1660 return false; 1661 1662 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1663 sdata = container_of(sdata->bss, 1664 struct ieee80211_sub_if_data, u.ap); 1665 1666 vif = &sdata->vif; 1667 txqi = ieee80211_get_txq(local, vif, sta, skb); 1668 1669 if (!txqi) 1670 return false; 1671 1672 ieee80211_txq_enqueue(local, txqi, skb); 1673 1674 schedule_and_wake_txq(local, txqi); 1675 1676 return true; 1677 } 1678 1679 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1680 struct ieee80211_vif *vif, 1681 struct sta_info *sta, 1682 struct sk_buff_head *skbs, 1683 bool txpending) 1684 { 1685 struct ieee80211_tx_control control = {}; 1686 struct sk_buff *skb, *tmp; 1687 unsigned long flags; 1688 1689 skb_queue_walk_safe(skbs, skb, tmp) { 1690 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1691 int q = info->hw_queue; 1692 1693 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1694 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1695 __skb_unlink(skb, skbs); 1696 ieee80211_free_txskb(&local->hw, skb); 1697 continue; 1698 } 1699 #endif 1700 1701 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1702 if (local->queue_stop_reasons[q] || 1703 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1704 if (unlikely(info->flags & 1705 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1706 if (local->queue_stop_reasons[q] & 1707 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1708 /* 1709 * Drop off-channel frames if queues 1710 * are stopped for any reason other 1711 * than off-channel operation. Never 1712 * queue them. 1713 */ 1714 spin_unlock_irqrestore( 1715 &local->queue_stop_reason_lock, 1716 flags); 1717 ieee80211_purge_tx_queue(&local->hw, 1718 skbs); 1719 return true; 1720 } 1721 } else { 1722 1723 /* 1724 * Since queue is stopped, queue up frames for 1725 * later transmission from the tx-pending 1726 * tasklet when the queue is woken again. 1727 */ 1728 if (txpending) 1729 skb_queue_splice_init(skbs, 1730 &local->pending[q]); 1731 else 1732 skb_queue_splice_tail_init(skbs, 1733 &local->pending[q]); 1734 1735 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1736 flags); 1737 return false; 1738 } 1739 } 1740 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1741 1742 info->control.vif = vif; 1743 control.sta = sta ? &sta->sta : NULL; 1744 1745 __skb_unlink(skb, skbs); 1746 drv_tx(local, &control, skb); 1747 } 1748 1749 return true; 1750 } 1751 1752 /* 1753 * Returns false if the frame couldn't be transmitted but was queued instead. 1754 */ 1755 static bool __ieee80211_tx(struct ieee80211_local *local, 1756 struct sk_buff_head *skbs, struct sta_info *sta, 1757 bool txpending) 1758 { 1759 struct ieee80211_tx_info *info; 1760 struct ieee80211_sub_if_data *sdata; 1761 struct ieee80211_vif *vif; 1762 struct sk_buff *skb; 1763 bool result; 1764 1765 if (WARN_ON(skb_queue_empty(skbs))) 1766 return true; 1767 1768 skb = skb_peek(skbs); 1769 info = IEEE80211_SKB_CB(skb); 1770 sdata = vif_to_sdata(info->control.vif); 1771 if (sta && !sta->uploaded) 1772 sta = NULL; 1773 1774 switch (sdata->vif.type) { 1775 case NL80211_IFTYPE_MONITOR: 1776 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1777 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1778 vif = &sdata->vif; 1779 break; 1780 } 1781 sdata = rcu_dereference(local->monitor_sdata); 1782 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1783 vif = &sdata->vif; 1784 info->hw_queue = 1785 vif->hw_queue[skb_get_queue_mapping(skb)]; 1786 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1787 ieee80211_purge_tx_queue(&local->hw, skbs); 1788 return true; 1789 } else 1790 vif = NULL; 1791 break; 1792 case NL80211_IFTYPE_AP_VLAN: 1793 sdata = container_of(sdata->bss, 1794 struct ieee80211_sub_if_data, u.ap); 1795 fallthrough; 1796 default: 1797 vif = &sdata->vif; 1798 break; 1799 } 1800 1801 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1802 1803 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1804 1805 return result; 1806 } 1807 1808 /* 1809 * Invoke TX handlers, return 0 on success and non-zero if the 1810 * frame was dropped or queued. 1811 * 1812 * The handlers are split into an early and late part. The latter is everything 1813 * that can be sensitive to reordering, and will be deferred to after packets 1814 * are dequeued from the intermediate queues (when they are enabled). 1815 */ 1816 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1817 { 1818 ieee80211_tx_result res = TX_DROP; 1819 1820 #define CALL_TXH(txh) \ 1821 do { \ 1822 res = txh(tx); \ 1823 if (res != TX_CONTINUE) \ 1824 goto txh_done; \ 1825 } while (0) 1826 1827 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1828 CALL_TXH(ieee80211_tx_h_check_assoc); 1829 CALL_TXH(ieee80211_tx_h_ps_buf); 1830 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1831 CALL_TXH(ieee80211_tx_h_select_key); 1832 1833 txh_done: 1834 if (unlikely(res == TX_DROP)) { 1835 tx->sdata->tx_handlers_drop++; 1836 if (tx->skb) 1837 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1838 else 1839 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1840 return -1; 1841 } else if (unlikely(res == TX_QUEUED)) { 1842 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1843 return -1; 1844 } 1845 1846 return 0; 1847 } 1848 1849 /* 1850 * Late handlers can be called while the sta lock is held. Handlers that can 1851 * cause packets to be generated will cause deadlock! 1852 */ 1853 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1854 { 1855 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1856 ieee80211_tx_result res = TX_CONTINUE; 1857 1858 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1859 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1860 1861 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1862 __skb_queue_tail(&tx->skbs, tx->skb); 1863 tx->skb = NULL; 1864 goto txh_done; 1865 } 1866 1867 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1868 CALL_TXH(ieee80211_tx_h_sequence); 1869 CALL_TXH(ieee80211_tx_h_fragment); 1870 /* handlers after fragment must be aware of tx info fragmentation! */ 1871 CALL_TXH(ieee80211_tx_h_stats); 1872 CALL_TXH(ieee80211_tx_h_encrypt); 1873 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1874 CALL_TXH(ieee80211_tx_h_calculate_duration); 1875 #undef CALL_TXH 1876 1877 txh_done: 1878 if (unlikely(res == TX_DROP)) { 1879 tx->sdata->tx_handlers_drop++; 1880 if (tx->skb) 1881 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1882 else 1883 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1884 return -1; 1885 } else if (unlikely(res == TX_QUEUED)) { 1886 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1887 return -1; 1888 } 1889 1890 return 0; 1891 } 1892 1893 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1894 { 1895 int r = invoke_tx_handlers_early(tx); 1896 1897 if (r) 1898 return r; 1899 return invoke_tx_handlers_late(tx); 1900 } 1901 1902 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1903 struct ieee80211_vif *vif, struct sk_buff *skb, 1904 int band, struct ieee80211_sta **sta) 1905 { 1906 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1907 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1908 struct ieee80211_tx_data tx; 1909 struct sk_buff *skb2; 1910 1911 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) { 1912 kfree_skb(skb); 1913 return false; 1914 } 1915 1916 info->band = band; 1917 info->control.vif = vif; 1918 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1919 1920 if (invoke_tx_handlers(&tx)) 1921 return false; 1922 1923 if (sta) { 1924 if (tx.sta) 1925 *sta = &tx.sta->sta; 1926 else 1927 *sta = NULL; 1928 } 1929 1930 /* this function isn't suitable for fragmented data frames */ 1931 skb2 = __skb_dequeue(&tx.skbs); 1932 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1933 ieee80211_free_txskb(hw, skb2); 1934 ieee80211_purge_tx_queue(hw, &tx.skbs); 1935 return false; 1936 } 1937 1938 return true; 1939 } 1940 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1941 1942 /* 1943 * Returns false if the frame couldn't be transmitted but was queued instead. 1944 */ 1945 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1946 struct sta_info *sta, struct sk_buff *skb, 1947 bool txpending) 1948 { 1949 struct ieee80211_local *local = sdata->local; 1950 struct ieee80211_tx_data tx; 1951 ieee80211_tx_result res_prepare; 1952 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1953 bool result = true; 1954 1955 if (unlikely(skb->len < 10)) { 1956 dev_kfree_skb(skb); 1957 return true; 1958 } 1959 1960 /* initialises tx */ 1961 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1962 1963 if (unlikely(res_prepare == TX_DROP)) { 1964 ieee80211_free_txskb(&local->hw, skb); 1965 tx.sdata->tx_handlers_drop++; 1966 return true; 1967 } else if (unlikely(res_prepare == TX_QUEUED)) { 1968 return true; 1969 } 1970 1971 /* set up hw_queue value early */ 1972 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1973 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1974 info->hw_queue = 1975 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1976 1977 if (invoke_tx_handlers_early(&tx)) 1978 return true; 1979 1980 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1981 return true; 1982 1983 if (!invoke_tx_handlers_late(&tx)) 1984 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1985 1986 return result; 1987 } 1988 1989 /* device xmit handlers */ 1990 1991 enum ieee80211_encrypt { 1992 ENCRYPT_NO, 1993 ENCRYPT_MGMT, 1994 ENCRYPT_DATA, 1995 }; 1996 1997 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1998 struct sk_buff *skb, 1999 int head_need, 2000 enum ieee80211_encrypt encrypt) 2001 { 2002 struct ieee80211_local *local = sdata->local; 2003 bool enc_tailroom; 2004 int tail_need = 0; 2005 2006 enc_tailroom = encrypt == ENCRYPT_MGMT || 2007 (encrypt == ENCRYPT_DATA && 2008 sdata->crypto_tx_tailroom_needed_cnt); 2009 2010 if (enc_tailroom) { 2011 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2012 tail_need -= skb_tailroom(skb); 2013 tail_need = max_t(int, tail_need, 0); 2014 } 2015 2016 if (skb_cloned(skb) && 2017 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2018 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2019 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2020 else if (head_need || tail_need) 2021 I802_DEBUG_INC(local->tx_expand_skb_head); 2022 else 2023 return 0; 2024 2025 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2026 wiphy_debug(local->hw.wiphy, 2027 "failed to reallocate TX buffer\n"); 2028 return -ENOMEM; 2029 } 2030 2031 return 0; 2032 } 2033 2034 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2035 struct sta_info *sta, struct sk_buff *skb) 2036 { 2037 struct ieee80211_local *local = sdata->local; 2038 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2039 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2040 int headroom; 2041 enum ieee80211_encrypt encrypt; 2042 2043 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2044 encrypt = ENCRYPT_NO; 2045 else if (ieee80211_is_mgmt(hdr->frame_control)) 2046 encrypt = ENCRYPT_MGMT; 2047 else 2048 encrypt = ENCRYPT_DATA; 2049 2050 headroom = local->tx_headroom; 2051 if (encrypt != ENCRYPT_NO) 2052 headroom += IEEE80211_ENCRYPT_HEADROOM; 2053 headroom -= skb_headroom(skb); 2054 headroom = max_t(int, 0, headroom); 2055 2056 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2057 ieee80211_free_txskb(&local->hw, skb); 2058 return; 2059 } 2060 2061 /* reload after potential resize */ 2062 hdr = (struct ieee80211_hdr *) skb->data; 2063 info->control.vif = &sdata->vif; 2064 2065 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2066 if (ieee80211_is_data(hdr->frame_control) && 2067 is_unicast_ether_addr(hdr->addr1)) { 2068 if (mesh_nexthop_resolve(sdata, skb)) 2069 return; /* skb queued: don't free */ 2070 } else { 2071 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2072 } 2073 } 2074 2075 ieee80211_set_qos_hdr(sdata, skb); 2076 ieee80211_tx(sdata, sta, skb, false); 2077 } 2078 2079 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2080 { 2081 struct ieee80211_radiotap_header *rthdr = 2082 (struct ieee80211_radiotap_header *)skb->data; 2083 2084 /* check for not even having the fixed radiotap header part */ 2085 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2086 return false; /* too short to be possibly valid */ 2087 2088 /* is it a header version we can trust to find length from? */ 2089 if (unlikely(rthdr->it_version)) 2090 return false; /* only version 0 is supported */ 2091 2092 /* does the skb contain enough to deliver on the alleged length? */ 2093 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2094 return false; /* skb too short for claimed rt header extent */ 2095 2096 return true; 2097 } 2098 2099 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2100 struct net_device *dev) 2101 { 2102 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2103 struct ieee80211_radiotap_iterator iterator; 2104 struct ieee80211_radiotap_header *rthdr = 2105 (struct ieee80211_radiotap_header *) skb->data; 2106 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2107 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2108 NULL); 2109 u16 txflags; 2110 u16 rate = 0; 2111 bool rate_found = false; 2112 u8 rate_retries = 0; 2113 u16 rate_flags = 0; 2114 u8 mcs_known, mcs_flags, mcs_bw; 2115 u16 vht_known; 2116 u8 vht_mcs = 0, vht_nss = 0; 2117 int i; 2118 2119 if (!ieee80211_validate_radiotap_len(skb)) 2120 return false; 2121 2122 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2123 IEEE80211_TX_CTL_DONTFRAG; 2124 2125 /* 2126 * for every radiotap entry that is present 2127 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2128 * entries present, or -EINVAL on error) 2129 */ 2130 2131 while (!ret) { 2132 ret = ieee80211_radiotap_iterator_next(&iterator); 2133 2134 if (ret) 2135 continue; 2136 2137 /* see if this argument is something we can use */ 2138 switch (iterator.this_arg_index) { 2139 /* 2140 * You must take care when dereferencing iterator.this_arg 2141 * for multibyte types... the pointer is not aligned. Use 2142 * get_unaligned((type *)iterator.this_arg) to dereference 2143 * iterator.this_arg for type "type" safely on all arches. 2144 */ 2145 case IEEE80211_RADIOTAP_FLAGS: 2146 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2147 /* 2148 * this indicates that the skb we have been 2149 * handed has the 32-bit FCS CRC at the end... 2150 * we should react to that by snipping it off 2151 * because it will be recomputed and added 2152 * on transmission 2153 */ 2154 if (skb->len < (iterator._max_length + FCS_LEN)) 2155 return false; 2156 2157 skb_trim(skb, skb->len - FCS_LEN); 2158 } 2159 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2160 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2161 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2162 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2163 break; 2164 2165 case IEEE80211_RADIOTAP_TX_FLAGS: 2166 txflags = get_unaligned_le16(iterator.this_arg); 2167 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2168 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2169 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2170 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2171 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2172 info->control.flags |= 2173 IEEE80211_TX_CTRL_DONT_REORDER; 2174 break; 2175 2176 case IEEE80211_RADIOTAP_RATE: 2177 rate = *iterator.this_arg; 2178 rate_flags = 0; 2179 rate_found = true; 2180 break; 2181 2182 case IEEE80211_RADIOTAP_ANTENNA: 2183 /* this can appear multiple times, keep a bitmap */ 2184 /* control.antennas is only a 2-bit bitmap */ 2185 if (*iterator.this_arg < 2) 2186 info->control.antennas |= BIT(*iterator.this_arg); 2187 break; 2188 2189 case IEEE80211_RADIOTAP_DATA_RETRIES: 2190 rate_retries = *iterator.this_arg; 2191 break; 2192 2193 case IEEE80211_RADIOTAP_MCS: 2194 mcs_known = iterator.this_arg[0]; 2195 mcs_flags = iterator.this_arg[1]; 2196 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2197 break; 2198 2199 rate_found = true; 2200 rate = iterator.this_arg[2]; 2201 rate_flags = IEEE80211_TX_RC_MCS; 2202 2203 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2204 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2205 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2206 2207 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2208 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2209 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2210 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2211 2212 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2213 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2214 info->flags |= IEEE80211_TX_CTL_LDPC; 2215 2216 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2217 u8 stbc = u8_get_bits(mcs_flags, 2218 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2219 2220 info->flags |= 2221 u32_encode_bits(stbc, 2222 IEEE80211_TX_CTL_STBC); 2223 } 2224 break; 2225 2226 case IEEE80211_RADIOTAP_VHT: 2227 vht_known = get_unaligned_le16(iterator.this_arg); 2228 rate_found = true; 2229 2230 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2231 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2232 (iterator.this_arg[2] & 2233 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2234 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2235 if (vht_known & 2236 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2237 if (iterator.this_arg[3] == 1) 2238 rate_flags |= 2239 IEEE80211_TX_RC_40_MHZ_WIDTH; 2240 else if (iterator.this_arg[3] == 4) 2241 rate_flags |= 2242 IEEE80211_TX_RC_80_MHZ_WIDTH; 2243 else if (iterator.this_arg[3] == 11) 2244 rate_flags |= 2245 IEEE80211_TX_RC_160_MHZ_WIDTH; 2246 } 2247 2248 vht_mcs = iterator.this_arg[4] >> 4; 2249 if (vht_mcs > 11) 2250 vht_mcs = 0; 2251 vht_nss = iterator.this_arg[4] & 0xF; 2252 if (!vht_nss || vht_nss > 8) 2253 vht_nss = 1; 2254 break; 2255 2256 /* 2257 * Please update the file 2258 * Documentation/networking/mac80211-injection.rst 2259 * when parsing new fields here. 2260 */ 2261 2262 default: 2263 break; 2264 } 2265 } 2266 2267 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2268 return false; 2269 2270 if (rate_found) { 2271 struct ieee80211_supported_band *sband = 2272 local->hw.wiphy->bands[info->band]; 2273 2274 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2275 2276 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2277 info->control.rates[i].idx = -1; 2278 info->control.rates[i].flags = 0; 2279 info->control.rates[i].count = 0; 2280 } 2281 2282 if (rate_flags & IEEE80211_TX_RC_MCS) { 2283 /* reset antennas if not enough */ 2284 if (IEEE80211_HT_MCS_CHAINS(rate) > 2285 hweight8(info->control.antennas)) 2286 info->control.antennas = 0; 2287 2288 info->control.rates[0].idx = rate; 2289 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2290 /* reset antennas if not enough */ 2291 if (vht_nss > hweight8(info->control.antennas)) 2292 info->control.antennas = 0; 2293 2294 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2295 vht_nss); 2296 } else if (sband) { 2297 for (i = 0; i < sband->n_bitrates; i++) { 2298 if (rate * 5 != sband->bitrates[i].bitrate) 2299 continue; 2300 2301 info->control.rates[0].idx = i; 2302 break; 2303 } 2304 } 2305 2306 if (info->control.rates[0].idx < 0) 2307 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2308 2309 info->control.rates[0].flags = rate_flags; 2310 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2311 local->hw.max_rate_tries); 2312 } 2313 2314 return true; 2315 } 2316 2317 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2318 struct net_device *dev) 2319 { 2320 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2321 struct ieee80211_chanctx_conf *chanctx_conf; 2322 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2323 struct ieee80211_hdr *hdr; 2324 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2325 struct cfg80211_chan_def *chandef; 2326 u16 len_rthdr; 2327 int hdrlen; 2328 2329 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2330 if (unlikely(!ieee80211_sdata_running(sdata))) 2331 goto fail; 2332 2333 memset(info, 0, sizeof(*info)); 2334 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2335 IEEE80211_TX_CTL_INJECTED; 2336 2337 /* Sanity-check the length of the radiotap header */ 2338 if (!ieee80211_validate_radiotap_len(skb)) 2339 goto fail; 2340 2341 /* we now know there is a radiotap header with a length we can use */ 2342 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2343 2344 /* 2345 * fix up the pointers accounting for the radiotap 2346 * header still being in there. We are being given 2347 * a precooked IEEE80211 header so no need for 2348 * normal processing 2349 */ 2350 skb_set_mac_header(skb, len_rthdr); 2351 /* 2352 * these are just fixed to the end of the rt area since we 2353 * don't have any better information and at this point, nobody cares 2354 */ 2355 skb_set_network_header(skb, len_rthdr); 2356 skb_set_transport_header(skb, len_rthdr); 2357 2358 if (skb->len < len_rthdr + 2) 2359 goto fail; 2360 2361 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2362 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2363 2364 if (skb->len < len_rthdr + hdrlen) 2365 goto fail; 2366 2367 /* 2368 * Initialize skb->protocol if the injected frame is a data frame 2369 * carrying a rfc1042 header 2370 */ 2371 if (ieee80211_is_data(hdr->frame_control) && 2372 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2373 u8 *payload = (u8 *)hdr + hdrlen; 2374 2375 if (ether_addr_equal(payload, rfc1042_header)) 2376 skb->protocol = cpu_to_be16((payload[6] << 8) | 2377 payload[7]); 2378 } 2379 2380 rcu_read_lock(); 2381 2382 /* 2383 * We process outgoing injected frames that have a local address 2384 * we handle as though they are non-injected frames. 2385 * This code here isn't entirely correct, the local MAC address 2386 * isn't always enough to find the interface to use; for proper 2387 * VLAN support we have an nl80211-based mechanism. 2388 * 2389 * This is necessary, for example, for old hostapd versions that 2390 * don't use nl80211-based management TX/RX. 2391 */ 2392 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2393 if (!ieee80211_sdata_running(tmp_sdata)) 2394 continue; 2395 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2396 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2397 continue; 2398 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2399 sdata = tmp_sdata; 2400 break; 2401 } 2402 } 2403 2404 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2405 if (!chanctx_conf) { 2406 tmp_sdata = rcu_dereference(local->monitor_sdata); 2407 if (tmp_sdata) 2408 chanctx_conf = 2409 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2410 } 2411 2412 if (!chanctx_conf) { 2413 struct ieee80211_chanctx *ctx; 2414 bool first = true; 2415 2416 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) { 2417 if (!first) 2418 goto fail_rcu; 2419 chanctx_conf = &ctx->conf; 2420 first = false; 2421 } 2422 } 2423 2424 if (chanctx_conf) 2425 chandef = &chanctx_conf->def; 2426 else 2427 goto fail_rcu; 2428 2429 /* 2430 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2431 * shouldn't transmit on disabled channels. 2432 */ 2433 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2434 IEEE80211_CHAN_DISABLED)) 2435 goto fail_rcu; 2436 2437 /* 2438 * Frame injection is not allowed if beaconing is not allowed 2439 * or if we need radar detection. Beaconing is usually not allowed when 2440 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2441 * Passive scan is also used in world regulatory domains where 2442 * your country is not known and as such it should be treated as 2443 * NO TX unless the channel is explicitly allowed in which case 2444 * your current regulatory domain would not have the passive scan 2445 * flag. 2446 * 2447 * Since AP mode uses monitor interfaces to inject/TX management 2448 * frames we can make AP mode the exception to this rule once it 2449 * supports radar detection as its implementation can deal with 2450 * radar detection by itself. We can do that later by adding a 2451 * monitor flag interfaces used for AP support. 2452 */ 2453 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2454 sdata->vif.type)) 2455 goto fail_rcu; 2456 2457 info->band = chandef->chan->band; 2458 2459 /* Initialize skb->priority according to frame type and TID class, 2460 * with respect to the sub interface that the frame will actually 2461 * be transmitted on. If the DONT_REORDER flag is set, the original 2462 * skb-priority is preserved to assure frames injected with this 2463 * flag are not reordered relative to each other. 2464 */ 2465 ieee80211_select_queue_80211(sdata, skb, hdr); 2466 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2467 2468 /* 2469 * Process the radiotap header. This will now take into account the 2470 * selected chandef above to accurately set injection rates and 2471 * retransmissions. 2472 */ 2473 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2474 goto fail_rcu; 2475 2476 /* remove the injection radiotap header */ 2477 skb_pull(skb, len_rthdr); 2478 2479 ieee80211_xmit(sdata, NULL, skb); 2480 rcu_read_unlock(); 2481 2482 return NETDEV_TX_OK; 2483 2484 fail_rcu: 2485 rcu_read_unlock(); 2486 fail: 2487 dev_kfree_skb(skb); 2488 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2489 } 2490 2491 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2492 { 2493 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2494 2495 return ethertype == ETH_P_TDLS && 2496 skb->len > 14 && 2497 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2498 } 2499 2500 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2501 struct sk_buff *skb, 2502 struct sta_info **sta_out) 2503 { 2504 struct sta_info *sta; 2505 2506 switch (sdata->vif.type) { 2507 case NL80211_IFTYPE_AP_VLAN: 2508 sta = rcu_dereference(sdata->u.vlan.sta); 2509 if (sta) { 2510 *sta_out = sta; 2511 return 0; 2512 } else if (sdata->wdev.use_4addr) { 2513 return -ENOLINK; 2514 } 2515 fallthrough; 2516 case NL80211_IFTYPE_AP: 2517 case NL80211_IFTYPE_OCB: 2518 case NL80211_IFTYPE_ADHOC: 2519 if (is_multicast_ether_addr(skb->data)) { 2520 *sta_out = ERR_PTR(-ENOENT); 2521 return 0; 2522 } 2523 sta = sta_info_get_bss(sdata, skb->data); 2524 break; 2525 #ifdef CONFIG_MAC80211_MESH 2526 case NL80211_IFTYPE_MESH_POINT: 2527 /* determined much later */ 2528 *sta_out = NULL; 2529 return 0; 2530 #endif 2531 case NL80211_IFTYPE_STATION: 2532 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2533 sta = sta_info_get(sdata, skb->data); 2534 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2535 if (test_sta_flag(sta, 2536 WLAN_STA_TDLS_PEER_AUTH)) { 2537 *sta_out = sta; 2538 return 0; 2539 } 2540 2541 /* 2542 * TDLS link during setup - throw out frames to 2543 * peer. Allow TDLS-setup frames to unauthorized 2544 * peers for the special case of a link teardown 2545 * after a TDLS sta is removed due to being 2546 * unreachable. 2547 */ 2548 if (!ieee80211_is_tdls_setup(skb)) 2549 return -EINVAL; 2550 } 2551 2552 } 2553 2554 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2555 if (!sta) 2556 return -ENOLINK; 2557 break; 2558 case NL80211_IFTYPE_NAN_DATA: 2559 if (is_multicast_ether_addr(skb->data)) { 2560 *sta_out = ERR_PTR(-ENOENT); 2561 return 0; 2562 } 2563 sta = sta_info_get(sdata, skb->data); 2564 break; 2565 default: 2566 return -EINVAL; 2567 } 2568 2569 *sta_out = sta ?: ERR_PTR(-ENOENT); 2570 return 0; 2571 } 2572 2573 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2574 struct sk_buff *skb, 2575 u32 *info_flags, 2576 u64 *cookie) 2577 { 2578 struct sk_buff *ack_skb; 2579 u16 info_id = 0; 2580 2581 if (skb->sk) 2582 ack_skb = skb_clone_sk(skb); 2583 else 2584 ack_skb = skb_clone(skb, GFP_ATOMIC); 2585 2586 if (ack_skb) { 2587 unsigned long flags; 2588 int id; 2589 2590 spin_lock_irqsave(&local->ack_status_lock, flags); 2591 id = idr_alloc(&local->ack_status_frames, ack_skb, 2592 1, 0x2000, GFP_ATOMIC); 2593 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2594 2595 if (id >= 0) { 2596 info_id = id; 2597 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2598 if (cookie) { 2599 *cookie = ieee80211_mgmt_tx_cookie(local); 2600 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2601 } 2602 } else { 2603 kfree_skb(ack_skb); 2604 } 2605 } 2606 2607 return info_id; 2608 } 2609 2610 /** 2611 * ieee80211_build_hdr - build 802.11 header in the given frame 2612 * @sdata: virtual interface to build the header for 2613 * @skb: the skb to build the header in 2614 * @info_flags: skb flags to set 2615 * @sta: the station pointer 2616 * @ctrl_flags: info control flags to set 2617 * @cookie: cookie pointer to fill (if not %NULL) 2618 * 2619 * This function takes the skb with 802.3 header and reformats the header to 2620 * the appropriate IEEE 802.11 header based on which interface the packet is 2621 * being transmitted on. 2622 * 2623 * Note that this function also takes care of the TX status request and 2624 * potential unsharing of the SKB - this needs to be interleaved with the 2625 * header building. 2626 * 2627 * The function requires the read-side RCU lock held 2628 * 2629 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2630 */ 2631 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2632 struct sk_buff *skb, u32 info_flags, 2633 struct sta_info *sta, u32 ctrl_flags, 2634 u64 *cookie) 2635 { 2636 struct ieee80211_local *local = sdata->local; 2637 struct ieee80211_tx_info *info; 2638 int head_need; 2639 u16 ethertype, hdrlen, meshhdrlen = 0; 2640 __le16 fc; 2641 struct ieee80211_hdr hdr; 2642 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2643 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2644 const u8 *encaps_data; 2645 int encaps_len, skip_header_bytes; 2646 bool wme_sta = false, authorized = false; 2647 bool tdls_peer; 2648 bool multicast; 2649 u16 info_id = 0; 2650 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2651 enum nl80211_band band; 2652 int ret; 2653 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2654 2655 if (IS_ERR(sta)) 2656 sta = NULL; 2657 2658 #ifdef CONFIG_MAC80211_DEBUGFS 2659 if (local->force_tx_status) 2660 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2661 #endif 2662 2663 /* convert Ethernet header to proper 802.11 header (based on 2664 * operation mode) */ 2665 ethertype = (skb->data[12] << 8) | skb->data[13]; 2666 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2667 2668 if (!ieee80211_vif_is_mld(&sdata->vif)) 2669 chanctx_conf = 2670 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2671 2672 switch (sdata->vif.type) { 2673 case NL80211_IFTYPE_AP_VLAN: 2674 if (sdata->wdev.use_4addr) { 2675 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2676 /* RA TA DA SA */ 2677 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2678 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2679 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2680 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2681 hdrlen = 30; 2682 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2683 wme_sta = sta->sta.wme; 2684 } 2685 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2686 struct ieee80211_sub_if_data *ap_sdata; 2687 2688 /* override chanctx_conf from AP (we don't have one) */ 2689 ap_sdata = container_of(sdata->bss, 2690 struct ieee80211_sub_if_data, 2691 u.ap); 2692 chanctx_conf = 2693 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2694 } 2695 if (sdata->wdev.use_4addr) 2696 break; 2697 fallthrough; 2698 case NL80211_IFTYPE_AP: 2699 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2700 /* DA BSSID SA */ 2701 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2702 2703 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2704 struct ieee80211_link_data *link; 2705 2706 link_id = sta->deflink.link_id; 2707 link = rcu_dereference(sdata->link[link_id]); 2708 if (WARN_ON(!link)) { 2709 ret = -ENOLINK; 2710 goto free; 2711 } 2712 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2713 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2714 (sta && sta->sta.mlo)) { 2715 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2716 } else { 2717 struct ieee80211_bss_conf *conf; 2718 2719 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2720 if (unlikely(!conf)) { 2721 ret = -ENOLINK; 2722 goto free; 2723 } 2724 2725 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2726 } 2727 2728 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2729 hdrlen = 24; 2730 break; 2731 #ifdef CONFIG_MAC80211_MESH 2732 case NL80211_IFTYPE_MESH_POINT: 2733 if (!is_multicast_ether_addr(skb->data)) { 2734 struct sta_info *next_hop; 2735 bool mpp_lookup = true; 2736 2737 mpath = mesh_path_lookup(sdata, skb->data); 2738 if (mpath) { 2739 mpp_lookup = false; 2740 next_hop = rcu_dereference(mpath->next_hop); 2741 if (!next_hop || 2742 !(mpath->flags & (MESH_PATH_ACTIVE | 2743 MESH_PATH_RESOLVING))) 2744 mpp_lookup = true; 2745 } 2746 2747 if (mpp_lookup) { 2748 mppath = mpp_path_lookup(sdata, skb->data); 2749 if (mppath) 2750 mppath->exp_time = jiffies; 2751 } 2752 2753 if (mppath && mpath) 2754 mesh_path_del(sdata, mpath->dst); 2755 } 2756 2757 /* 2758 * Use address extension if it is a packet from 2759 * another interface or if we know the destination 2760 * is being proxied by a portal (i.e. portal address 2761 * differs from proxied address) 2762 */ 2763 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2764 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2765 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2766 skb->data, skb->data + ETH_ALEN); 2767 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2768 NULL, NULL); 2769 } else { 2770 /* DS -> MBSS (802.11-2012 13.11.3.3). 2771 * For unicast with unknown forwarding information, 2772 * destination might be in the MBSS or if that fails 2773 * forwarded to another mesh gate. In either case 2774 * resolution will be handled in ieee80211_xmit(), so 2775 * leave the original DA. This also works for mcast */ 2776 const u8 *mesh_da = skb->data; 2777 2778 if (mppath) 2779 mesh_da = mppath->mpp; 2780 else if (mpath) 2781 mesh_da = mpath->dst; 2782 2783 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2784 mesh_da, sdata->vif.addr); 2785 if (is_multicast_ether_addr(mesh_da)) 2786 /* DA TA mSA AE:SA */ 2787 meshhdrlen = ieee80211_new_mesh_header( 2788 sdata, &mesh_hdr, 2789 skb->data + ETH_ALEN, NULL); 2790 else 2791 /* RA TA mDA mSA AE:DA SA */ 2792 meshhdrlen = ieee80211_new_mesh_header( 2793 sdata, &mesh_hdr, skb->data, 2794 skb->data + ETH_ALEN); 2795 2796 } 2797 2798 /* For injected frames, fill RA right away as nexthop lookup 2799 * will be skipped. 2800 */ 2801 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2802 is_zero_ether_addr(hdr.addr1)) 2803 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2804 break; 2805 #endif 2806 case NL80211_IFTYPE_STATION: 2807 /* we already did checks when looking up the RA STA */ 2808 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2809 2810 if (tdls_peer) { 2811 /* For TDLS only one link can be valid with peer STA */ 2812 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2813 struct ieee80211_link_data *link; 2814 2815 /* DA SA BSSID */ 2816 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2817 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2818 link = rcu_dereference(sdata->link[tdls_link_id]); 2819 if (WARN_ON_ONCE(!link)) { 2820 ret = -EINVAL; 2821 goto free; 2822 } 2823 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2824 hdrlen = 24; 2825 } else if (sdata->u.mgd.use_4addr && 2826 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2827 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2828 IEEE80211_FCTL_TODS); 2829 /* RA TA DA SA */ 2830 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2831 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2832 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2833 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2834 hdrlen = 30; 2835 } else { 2836 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2837 /* BSSID SA DA */ 2838 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2839 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2840 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2841 hdrlen = 24; 2842 } 2843 break; 2844 case NL80211_IFTYPE_OCB: 2845 /* DA SA BSSID */ 2846 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2847 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2848 eth_broadcast_addr(hdr.addr3); 2849 hdrlen = 24; 2850 break; 2851 case NL80211_IFTYPE_ADHOC: 2852 /* DA SA BSSID */ 2853 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2854 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2855 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2856 hdrlen = 24; 2857 break; 2858 case NL80211_IFTYPE_NAN_DATA: { 2859 struct ieee80211_sub_if_data *nmi; 2860 2861 /* DA SA Cluster ID */ 2862 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2863 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2864 nmi = rcu_dereference(sdata->u.nan_data.nmi); 2865 if (!nmi) { 2866 ret = -ENOTCONN; 2867 goto free; 2868 } 2869 memcpy(hdr.addr3, nmi->u.nan.conf.cluster_id, ETH_ALEN); 2870 hdrlen = 24; 2871 break; 2872 } 2873 default: 2874 ret = -EINVAL; 2875 goto free; 2876 } 2877 2878 if (!chanctx_conf) { 2879 if (sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 2880 /* NAN operates on multiple bands */ 2881 band = NUM_NL80211_BANDS; 2882 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 2883 ret = -ENOTCONN; 2884 goto free; 2885 } else { 2886 /* MLD transmissions must not rely on the band */ 2887 band = 0; 2888 } 2889 } else { 2890 band = chanctx_conf->def.chan->band; 2891 } 2892 2893 multicast = is_multicast_ether_addr(hdr.addr1); 2894 2895 /* sta is always NULL for mesh */ 2896 if (sta) { 2897 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2898 wme_sta = sta->sta.wme; 2899 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2900 /* For mesh, the use of the QoS header is mandatory */ 2901 wme_sta = true; 2902 } 2903 2904 /* receiver does QoS (which also means we do) use it */ 2905 if (wme_sta) { 2906 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2907 hdrlen += 2; 2908 } 2909 2910 /* 2911 * Drop unicast frames to unauthorised stations unless they are 2912 * EAPOL frames from the local station. 2913 */ 2914 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2915 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2916 !multicast && !authorized && 2917 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2918 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2919 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2920 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2921 sdata->name, hdr.addr1); 2922 #endif 2923 2924 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2925 2926 ret = -EPERM; 2927 goto free; 2928 } 2929 2930 if (unlikely(!multicast && 2931 (sk_requests_wifi_status(skb->sk) || 2932 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2933 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2934 cookie); 2935 2936 /* 2937 * If the skb is shared we need to obtain our own copy. 2938 */ 2939 skb = skb_share_check(skb, GFP_ATOMIC); 2940 if (unlikely(!skb)) { 2941 ret = -ENOMEM; 2942 goto free; 2943 } 2944 2945 hdr.frame_control = fc; 2946 hdr.duration_id = 0; 2947 hdr.seq_ctrl = 0; 2948 2949 skip_header_bytes = ETH_HLEN; 2950 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2951 encaps_data = bridge_tunnel_header; 2952 encaps_len = sizeof(bridge_tunnel_header); 2953 skip_header_bytes -= 2; 2954 } else if (ethertype >= ETH_P_802_3_MIN) { 2955 encaps_data = rfc1042_header; 2956 encaps_len = sizeof(rfc1042_header); 2957 skip_header_bytes -= 2; 2958 } else { 2959 encaps_data = NULL; 2960 encaps_len = 0; 2961 } 2962 2963 skb_pull(skb, skip_header_bytes); 2964 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2965 2966 /* 2967 * So we need to modify the skb header and hence need a copy of 2968 * that. The head_need variable above doesn't, so far, include 2969 * the needed header space that we don't need right away. If we 2970 * can, then we don't reallocate right now but only after the 2971 * frame arrives at the master device (if it does...) 2972 * 2973 * If we cannot, however, then we will reallocate to include all 2974 * the ever needed space. Also, if we need to reallocate it anyway, 2975 * make it big enough for everything we may ever need. 2976 */ 2977 2978 if (head_need > 0 || skb_cloned(skb)) { 2979 head_need += IEEE80211_ENCRYPT_HEADROOM; 2980 head_need += local->tx_headroom; 2981 head_need = max_t(int, 0, head_need); 2982 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2983 ieee80211_free_txskb(&local->hw, skb); 2984 skb = NULL; 2985 return ERR_PTR(-ENOMEM); 2986 } 2987 } 2988 2989 if (encaps_data) 2990 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2991 2992 #ifdef CONFIG_MAC80211_MESH 2993 if (meshhdrlen > 0) 2994 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2995 #endif 2996 2997 if (ieee80211_is_data_qos(fc)) { 2998 __le16 *qos_control; 2999 3000 qos_control = skb_push(skb, 2); 3001 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 3002 /* 3003 * Maybe we could actually set some fields here, for now just 3004 * initialise to zero to indicate no special operation. 3005 */ 3006 *qos_control = 0; 3007 } else 3008 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 3009 3010 skb_reset_mac_header(skb); 3011 3012 info = IEEE80211_SKB_CB(skb); 3013 memset(info, 0, sizeof(*info)); 3014 3015 info->flags = info_flags; 3016 if (info_id) { 3017 info->status_data = info_id; 3018 info->status_data_idr = 1; 3019 } 3020 info->band = band; 3021 3022 if (likely(!cookie)) { 3023 ctrl_flags |= u32_encode_bits(link_id, 3024 IEEE80211_TX_CTRL_MLO_LINK); 3025 } else { 3026 unsigned int pre_conf_link_id; 3027 3028 /* 3029 * ctrl_flags already have been set by 3030 * ieee80211_tx_control_port(), here 3031 * we just sanity check that 3032 */ 3033 3034 pre_conf_link_id = u32_get_bits(ctrl_flags, 3035 IEEE80211_TX_CTRL_MLO_LINK); 3036 3037 if (pre_conf_link_id != link_id && 3038 link_id != IEEE80211_LINK_UNSPECIFIED) { 3039 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 3040 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 3041 sdata->name, hdr.addr1, 3042 pre_conf_link_id, link_id); 3043 #endif 3044 ret = -EINVAL; 3045 goto free; 3046 } 3047 } 3048 3049 info->control.flags = ctrl_flags; 3050 3051 return skb; 3052 free: 3053 kfree_skb(skb); 3054 return ERR_PTR(ret); 3055 } 3056 3057 /* 3058 * fast-xmit overview 3059 * 3060 * The core idea of this fast-xmit is to remove per-packet checks by checking 3061 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3062 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3063 * much less work can be done per packet. For example, fragmentation must be 3064 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3065 * in the code here. 3066 * 3067 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3068 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3069 * 3070 * The most difficult part of this is that when any of these assumptions 3071 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3072 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3073 * since the per-packet code no longer checks the conditions. This is reflected 3074 * by the calls to these functions throughout the rest of the code, and must be 3075 * maintained if any of the TX path checks change. 3076 */ 3077 3078 void ieee80211_check_fast_xmit(struct sta_info *sta) 3079 { 3080 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3081 struct ieee80211_local *local = sta->local; 3082 struct ieee80211_sub_if_data *sdata = sta->sdata; 3083 struct ieee80211_hdr *hdr = (void *)build.hdr; 3084 struct ieee80211_chanctx_conf *chanctx_conf; 3085 __le16 fc; 3086 3087 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3088 return; 3089 3090 if (ieee80211_vif_is_mesh(&sdata->vif)) 3091 mesh_fast_tx_flush_sta(sdata, sta); 3092 3093 /* Locking here protects both the pointer itself, and against concurrent 3094 * invocations winning data access races to, e.g., the key pointer that 3095 * is used. 3096 * Without it, the invocation of this function right after the key 3097 * pointer changes wouldn't be sufficient, as another CPU could access 3098 * the pointer, then stall, and then do the cache update after the CPU 3099 * that invalidated the key. 3100 * With the locking, such scenarios cannot happen as the check for the 3101 * key and the fast-tx assignment are done atomically, so the CPU that 3102 * modifies the key will either wait or other one will see the key 3103 * cleared/changed already. 3104 */ 3105 spin_lock_bh(&sta->lock); 3106 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3107 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3108 sdata->vif.type == NL80211_IFTYPE_STATION) 3109 goto out; 3110 3111 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3112 goto out; 3113 3114 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3115 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3116 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3117 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3118 goto out; 3119 3120 if (sdata->noack_map) 3121 goto out; 3122 3123 /* fast-xmit doesn't handle fragmentation at all */ 3124 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3125 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3126 goto out; 3127 3128 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3129 rcu_read_lock(); 3130 chanctx_conf = 3131 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3132 if (!chanctx_conf) { 3133 rcu_read_unlock(); 3134 goto out; 3135 } 3136 build.band = chanctx_conf->def.chan->band; 3137 rcu_read_unlock(); 3138 } else { 3139 /* MLD transmissions must not rely on the band */ 3140 build.band = 0; 3141 } 3142 3143 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3144 3145 switch (sdata->vif.type) { 3146 case NL80211_IFTYPE_ADHOC: 3147 /* DA SA BSSID */ 3148 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3149 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3150 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3151 build.hdr_len = 24; 3152 break; 3153 case NL80211_IFTYPE_STATION: 3154 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3155 /* For TDLS only one link can be valid with peer STA */ 3156 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3157 struct ieee80211_link_data *link; 3158 3159 /* DA SA BSSID */ 3160 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3161 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3162 rcu_read_lock(); 3163 link = rcu_dereference(sdata->link[tdls_link_id]); 3164 if (!WARN_ON_ONCE(!link)) 3165 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3166 rcu_read_unlock(); 3167 build.hdr_len = 24; 3168 break; 3169 } 3170 3171 if (sdata->u.mgd.use_4addr) { 3172 /* non-regular ethertype cannot use the fastpath */ 3173 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3174 IEEE80211_FCTL_TODS); 3175 /* RA TA DA SA */ 3176 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3177 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3178 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3179 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3180 build.hdr_len = 30; 3181 break; 3182 } 3183 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3184 /* BSSID SA DA */ 3185 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3186 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3187 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3188 build.hdr_len = 24; 3189 break; 3190 case NL80211_IFTYPE_AP_VLAN: 3191 if (sdata->wdev.use_4addr) { 3192 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3193 IEEE80211_FCTL_TODS); 3194 /* RA TA DA SA */ 3195 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3196 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3197 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3198 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3199 build.hdr_len = 30; 3200 break; 3201 } 3202 fallthrough; 3203 case NL80211_IFTYPE_AP: 3204 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3205 /* DA BSSID SA */ 3206 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3207 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3208 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3209 } else { 3210 unsigned int link_id = sta->deflink.link_id; 3211 struct ieee80211_link_data *link; 3212 3213 rcu_read_lock(); 3214 link = rcu_dereference(sdata->link[link_id]); 3215 if (WARN_ON(!link)) { 3216 rcu_read_unlock(); 3217 goto out; 3218 } 3219 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3220 rcu_read_unlock(); 3221 } 3222 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3223 build.hdr_len = 24; 3224 break; 3225 default: 3226 /* not handled on fast-xmit */ 3227 goto out; 3228 } 3229 3230 if (sta->sta.wme) { 3231 build.hdr_len += 2; 3232 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3233 } 3234 3235 /* We store the key here so there's no point in using rcu_dereference() 3236 * but that's fine because the code that changes the pointers will call 3237 * this function after doing so. For a single CPU that would be enough, 3238 * for multiple see the comment above. 3239 */ 3240 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3241 if (!build.key) 3242 build.key = rcu_access_pointer(sdata->default_unicast_key); 3243 if (build.key) { 3244 bool gen_iv, iv_spc, mmic; 3245 3246 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3247 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3248 mmic = build.key->conf.flags & 3249 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3250 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3251 3252 /* don't handle software crypto */ 3253 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3254 goto out; 3255 3256 /* Key is being removed */ 3257 if (build.key->flags & KEY_FLAG_TAINTED) 3258 goto out; 3259 3260 switch (build.key->conf.cipher) { 3261 case WLAN_CIPHER_SUITE_CCMP: 3262 case WLAN_CIPHER_SUITE_CCMP_256: 3263 if (gen_iv) 3264 build.pn_offs = build.hdr_len; 3265 if (gen_iv || iv_spc) 3266 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3267 break; 3268 case WLAN_CIPHER_SUITE_GCMP: 3269 case WLAN_CIPHER_SUITE_GCMP_256: 3270 if (gen_iv) 3271 build.pn_offs = build.hdr_len; 3272 if (gen_iv || iv_spc) 3273 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3274 break; 3275 case WLAN_CIPHER_SUITE_TKIP: 3276 /* cannot handle MMIC or IV generation in xmit-fast */ 3277 if (mmic || gen_iv) 3278 goto out; 3279 if (iv_spc) 3280 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3281 break; 3282 case WLAN_CIPHER_SUITE_WEP40: 3283 case WLAN_CIPHER_SUITE_WEP104: 3284 /* cannot handle IV generation in fast-xmit */ 3285 if (gen_iv) 3286 goto out; 3287 if (iv_spc) 3288 build.hdr_len += IEEE80211_WEP_IV_LEN; 3289 break; 3290 case WLAN_CIPHER_SUITE_AES_CMAC: 3291 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3292 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3293 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3294 WARN(1, 3295 "management cipher suite 0x%x enabled for data\n", 3296 build.key->conf.cipher); 3297 goto out; 3298 default: 3299 /* we don't know how to generate IVs for this at all */ 3300 if (WARN_ON(gen_iv)) 3301 goto out; 3302 } 3303 3304 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3305 } 3306 3307 hdr->frame_control = fc; 3308 3309 memcpy(build.hdr + build.hdr_len, 3310 rfc1042_header, sizeof(rfc1042_header)); 3311 build.hdr_len += sizeof(rfc1042_header); 3312 3313 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3314 /* if the kmemdup fails, continue w/o fast_tx */ 3315 3316 out: 3317 /* we might have raced against another call to this function */ 3318 old = rcu_dereference_protected(sta->fast_tx, 3319 lockdep_is_held(&sta->lock)); 3320 rcu_assign_pointer(sta->fast_tx, fast_tx); 3321 if (old) 3322 kfree_rcu(old, rcu_head); 3323 spin_unlock_bh(&sta->lock); 3324 } 3325 3326 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3327 { 3328 struct sta_info *sta; 3329 3330 rcu_read_lock(); 3331 list_for_each_entry_rcu(sta, &local->sta_list, list) 3332 ieee80211_check_fast_xmit(sta); 3333 rcu_read_unlock(); 3334 } 3335 3336 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3337 { 3338 struct ieee80211_local *local = sdata->local; 3339 struct sta_info *sta; 3340 3341 rcu_read_lock(); 3342 3343 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3344 if (sdata != sta->sdata && 3345 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3346 continue; 3347 ieee80211_check_fast_xmit(sta); 3348 } 3349 3350 rcu_read_unlock(); 3351 } 3352 3353 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3354 { 3355 struct ieee80211_fast_tx *fast_tx; 3356 3357 spin_lock_bh(&sta->lock); 3358 fast_tx = rcu_dereference_protected(sta->fast_tx, 3359 lockdep_is_held(&sta->lock)); 3360 RCU_INIT_POINTER(sta->fast_tx, NULL); 3361 spin_unlock_bh(&sta->lock); 3362 3363 if (fast_tx) 3364 kfree_rcu(fast_tx, rcu_head); 3365 } 3366 3367 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3368 struct sk_buff *skb, int headroom) 3369 { 3370 if (skb_headroom(skb) < headroom) { 3371 I802_DEBUG_INC(local->tx_expand_skb_head); 3372 3373 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3374 wiphy_debug(local->hw.wiphy, 3375 "failed to reallocate TX buffer\n"); 3376 return false; 3377 } 3378 } 3379 3380 return true; 3381 } 3382 3383 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3384 struct ieee80211_fast_tx *fast_tx, 3385 struct sk_buff *skb) 3386 { 3387 struct ieee80211_local *local = sdata->local; 3388 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3389 struct ieee80211_hdr *hdr; 3390 struct ethhdr *amsdu_hdr; 3391 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3392 int subframe_len = skb->len - hdr_len; 3393 void *data; 3394 u8 *qc, *h_80211_src, *h_80211_dst; 3395 const u8 *bssid; 3396 3397 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3398 return false; 3399 3400 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3401 return true; 3402 3403 if (!ieee80211_amsdu_realloc_pad(local, skb, 3404 sizeof(*amsdu_hdr) + 3405 local->hw.extra_tx_headroom)) 3406 return false; 3407 3408 data = skb_push(skb, sizeof(*amsdu_hdr)); 3409 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3410 hdr = data; 3411 amsdu_hdr = data + hdr_len; 3412 /* h_80211_src/dst is addr* field within hdr */ 3413 h_80211_src = data + fast_tx->sa_offs; 3414 h_80211_dst = data + fast_tx->da_offs; 3415 3416 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3417 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3418 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3419 3420 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3421 * fields needs to be changed to BSSID for A-MSDU frames depending 3422 * on FromDS/ToDS values. 3423 */ 3424 switch (sdata->vif.type) { 3425 case NL80211_IFTYPE_STATION: 3426 bssid = sdata->vif.cfg.ap_addr; 3427 break; 3428 case NL80211_IFTYPE_AP: 3429 case NL80211_IFTYPE_AP_VLAN: 3430 bssid = sdata->vif.addr; 3431 break; 3432 default: 3433 bssid = NULL; 3434 } 3435 3436 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3437 ether_addr_copy(h_80211_src, bssid); 3438 3439 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3440 ether_addr_copy(h_80211_dst, bssid); 3441 3442 qc = ieee80211_get_qos_ctl(hdr); 3443 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3444 3445 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3446 3447 return true; 3448 } 3449 3450 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3451 struct sta_info *sta, 3452 struct ieee80211_fast_tx *fast_tx, 3453 struct sk_buff *skb, 3454 const u8 *da, const u8 *sa) 3455 { 3456 struct ieee80211_local *local = sdata->local; 3457 struct fq *fq = &local->fq; 3458 struct fq_tin *tin; 3459 struct fq_flow *flow; 3460 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3461 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3462 struct txq_info *txqi; 3463 struct sk_buff **frag_tail, *head; 3464 int subframe_len = skb->len - ETH_ALEN; 3465 u8 max_subframes = sta->sta.max_amsdu_subframes; 3466 int max_frags = local->hw.max_tx_fragments; 3467 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3468 int orig_truesize; 3469 u32 flow_idx; 3470 __be16 len; 3471 void *data; 3472 bool ret = false; 3473 unsigned int orig_len; 3474 int n = 2, nfrags, pad = 0; 3475 u16 hdrlen; 3476 3477 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3478 return false; 3479 3480 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3481 return false; 3482 3483 if (ieee80211_vif_is_mesh(&sdata->vif)) 3484 return false; 3485 3486 if (skb_is_gso(skb)) 3487 return false; 3488 3489 if (!txq) 3490 return false; 3491 3492 txqi = to_txq_info(txq); 3493 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3494 return false; 3495 3496 if (sta->sta.cur->max_rc_amsdu_len) 3497 max_amsdu_len = min_t(int, max_amsdu_len, 3498 sta->sta.cur->max_rc_amsdu_len); 3499 3500 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3501 max_amsdu_len = min_t(int, max_amsdu_len, 3502 sta->sta.cur->max_tid_amsdu_len[tid]); 3503 3504 flow_idx = fq_flow_idx(fq, skb); 3505 3506 spin_lock_bh(&fq->lock); 3507 3508 /* TODO: Ideally aggregation should be done on dequeue to remain 3509 * responsive to environment changes. 3510 */ 3511 3512 tin = &txqi->tin; 3513 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3514 head = skb_peek_tail(&flow->queue); 3515 if (!head || skb_is_gso(head)) 3516 goto out; 3517 3518 orig_truesize = head->truesize; 3519 orig_len = head->len; 3520 3521 if (skb->len + head->len > max_amsdu_len) 3522 goto out; 3523 3524 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3525 nfrags += 1 + skb_shinfo(head)->nr_frags; 3526 frag_tail = &skb_shinfo(head)->frag_list; 3527 while (*frag_tail) { 3528 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3529 frag_tail = &(*frag_tail)->next; 3530 n++; 3531 } 3532 3533 if (max_subframes && n > max_subframes) 3534 goto out; 3535 3536 if (max_frags && nfrags > max_frags) 3537 goto out; 3538 3539 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3540 goto out; 3541 3542 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3543 goto out; 3544 3545 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3546 * and frag_tail should be &skb_shinfo(head)->frag_list. 3547 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3548 * Reload frag_tail to have it pointing to the correct place. 3549 */ 3550 if (n == 2) 3551 frag_tail = &skb_shinfo(head)->frag_list; 3552 3553 /* 3554 * Pad out the previous subframe to a multiple of 4 by adding the 3555 * padding to the next one, that's being added. Note that head->len 3556 * is the length of the full A-MSDU, but that works since each time 3557 * we add a new subframe we pad out the previous one to a multiple 3558 * of 4 and thus it no longer matters in the next round. 3559 */ 3560 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3561 if ((head->len - hdrlen) & 3) 3562 pad = 4 - ((head->len - hdrlen) & 3); 3563 3564 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3565 2 + pad)) 3566 goto out_recalc; 3567 3568 ret = true; 3569 data = skb_push(skb, ETH_ALEN + 2); 3570 ether_addr_copy(data, da); 3571 ether_addr_copy(data + ETH_ALEN, sa); 3572 3573 data += 2 * ETH_ALEN; 3574 len = cpu_to_be16(subframe_len); 3575 memcpy(data, &len, 2); 3576 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3577 3578 memset(skb_push(skb, pad), 0, pad); 3579 3580 head->len += skb->len; 3581 head->data_len += skb->len; 3582 *frag_tail = skb; 3583 3584 out_recalc: 3585 fq->memory_usage += head->truesize - orig_truesize; 3586 if (head->len != orig_len) { 3587 flow->backlog += head->len - orig_len; 3588 tin->backlog_bytes += head->len - orig_len; 3589 } 3590 out: 3591 spin_unlock_bh(&fq->lock); 3592 3593 return ret; 3594 } 3595 3596 /* 3597 * Can be called while the sta lock is held. Anything that can cause packets to 3598 * be generated will cause deadlock! 3599 */ 3600 static ieee80211_tx_result 3601 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3602 struct sta_info *sta, u8 pn_offs, 3603 struct ieee80211_key *key, 3604 struct ieee80211_tx_data *tx) 3605 { 3606 struct sk_buff *skb = tx->skb; 3607 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3608 struct ieee80211_hdr *hdr = (void *)skb->data; 3609 u8 tid = IEEE80211_NUM_TIDS; 3610 3611 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3612 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3613 return TX_DROP; 3614 3615 if (key) 3616 info->control.hw_key = &key->conf; 3617 3618 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3619 3620 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3621 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3622 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3623 } else { 3624 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3625 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3626 sdata->sequence_number += 0x10; 3627 } 3628 3629 if (skb_shinfo(skb)->gso_size) 3630 sta->deflink.tx_stats.msdu[tid] += 3631 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3632 else 3633 sta->deflink.tx_stats.msdu[tid]++; 3634 3635 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3636 3637 /* statistics normally done by ieee80211_tx_h_stats (but that 3638 * has to consider fragmentation, so is more complex) 3639 */ 3640 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3641 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3642 3643 if (pn_offs) { 3644 u64 pn; 3645 u8 *crypto_hdr = skb->data + pn_offs; 3646 3647 switch (key->conf.cipher) { 3648 case WLAN_CIPHER_SUITE_CCMP: 3649 case WLAN_CIPHER_SUITE_CCMP_256: 3650 case WLAN_CIPHER_SUITE_GCMP: 3651 case WLAN_CIPHER_SUITE_GCMP_256: 3652 pn = atomic64_inc_return(&key->conf.tx_pn); 3653 crypto_hdr[0] = pn; 3654 crypto_hdr[1] = pn >> 8; 3655 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3656 crypto_hdr[4] = pn >> 16; 3657 crypto_hdr[5] = pn >> 24; 3658 crypto_hdr[6] = pn >> 32; 3659 crypto_hdr[7] = pn >> 40; 3660 break; 3661 } 3662 } 3663 3664 return TX_CONTINUE; 3665 } 3666 3667 static netdev_features_t 3668 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3669 { 3670 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3671 return sdata->vif.netdev_features; 3672 3673 if (!sdata->bss) 3674 return 0; 3675 3676 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3677 return sdata->vif.netdev_features; 3678 } 3679 3680 static struct sk_buff * 3681 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3682 { 3683 if (skb_is_gso(skb)) { 3684 struct sk_buff *segs; 3685 3686 segs = skb_gso_segment(skb, features); 3687 if (!segs) 3688 return skb; 3689 if (IS_ERR(segs)) 3690 goto free; 3691 3692 consume_skb(skb); 3693 return segs; 3694 } 3695 3696 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3697 goto free; 3698 3699 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3700 int ofs = skb_checksum_start_offset(skb); 3701 3702 if (skb->encapsulation) 3703 skb_set_inner_transport_header(skb, ofs); 3704 else 3705 skb_set_transport_header(skb, ofs); 3706 3707 if (skb_csum_hwoffload_help(skb, features)) 3708 goto free; 3709 } 3710 3711 skb_mark_not_on_list(skb); 3712 return skb; 3713 3714 free: 3715 kfree_skb(skb); 3716 return NULL; 3717 } 3718 3719 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3720 struct sta_info *sta, 3721 struct ieee80211_fast_tx *fast_tx, 3722 struct sk_buff *skb, bool ampdu, 3723 const u8 *da, const u8 *sa) 3724 { 3725 struct ieee80211_local *local = sdata->local; 3726 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3727 struct ieee80211_tx_info *info; 3728 struct ieee80211_tx_data tx; 3729 ieee80211_tx_result r; 3730 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3731 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3732 3733 skb = skb_share_check(skb, GFP_ATOMIC); 3734 if (unlikely(!skb)) 3735 return; 3736 3737 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3738 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3739 return; 3740 3741 /* will not be crypto-handled beyond what we do here, so use false 3742 * as the may-encrypt argument for the resize to not account for 3743 * more room than we already have in 'extra_head' 3744 */ 3745 if (unlikely(ieee80211_skb_resize(sdata, skb, 3746 max_t(int, extra_head + hw_headroom - 3747 skb_headroom(skb), 0), 3748 ENCRYPT_NO))) 3749 goto free; 3750 3751 hdr = skb_push(skb, extra_head); 3752 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3753 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3754 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3755 3756 info = IEEE80211_SKB_CB(skb); 3757 memset(info, 0, sizeof(*info)); 3758 info->band = fast_tx->band; 3759 info->control.vif = &sdata->vif; 3760 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3761 IEEE80211_TX_CTL_DONTFRAG; 3762 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3763 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3764 IEEE80211_TX_CTRL_MLO_LINK); 3765 3766 #ifdef CONFIG_MAC80211_DEBUGFS 3767 if (local->force_tx_status) 3768 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3769 #endif 3770 3771 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3772 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3773 3774 *ieee80211_get_qos_ctl(hdr) = tid; 3775 } 3776 3777 __skb_queue_head_init(&tx.skbs); 3778 3779 tx.flags = IEEE80211_TX_UNICAST; 3780 tx.local = local; 3781 tx.sdata = sdata; 3782 tx.sta = sta; 3783 tx.key = fast_tx->key; 3784 3785 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3786 return; 3787 3788 tx.skb = skb; 3789 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3790 fast_tx->key, &tx); 3791 tx.skb = NULL; 3792 if (r == TX_DROP) { 3793 tx.sdata->tx_handlers_drop++; 3794 goto free; 3795 } 3796 3797 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3798 sdata = container_of(sdata->bss, 3799 struct ieee80211_sub_if_data, u.ap); 3800 3801 __skb_queue_tail(&tx.skbs, skb); 3802 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3803 return; 3804 3805 free: 3806 kfree_skb(skb); 3807 } 3808 3809 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3810 struct sta_info *sta, 3811 struct ieee80211_fast_tx *fast_tx, 3812 struct sk_buff *skb) 3813 { 3814 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3815 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3816 struct tid_ampdu_tx *tid_tx = NULL; 3817 struct sk_buff *next; 3818 struct ethhdr eth; 3819 u8 tid = IEEE80211_NUM_TIDS; 3820 3821 /* control port protocol needs a lot of special handling */ 3822 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3823 return false; 3824 3825 /* only RFC 1042 SNAP */ 3826 if (ethertype < ETH_P_802_3_MIN) 3827 return false; 3828 3829 /* don't handle TX status request here either */ 3830 if (sk_requests_wifi_status(skb->sk)) 3831 return false; 3832 3833 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3834 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3835 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3836 if (tid_tx) { 3837 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3838 return false; 3839 if (tid_tx->timeout) 3840 tid_tx->last_tx = jiffies; 3841 } 3842 } 3843 3844 memcpy(ð, skb->data, ETH_HLEN - 2); 3845 3846 /* after this point (skb is modified) we cannot return false */ 3847 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3848 if (!skb) 3849 return true; 3850 3851 skb_list_walk_safe(skb, skb, next) { 3852 skb_mark_not_on_list(skb); 3853 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3854 eth.h_dest, eth.h_source); 3855 } 3856 3857 return true; 3858 } 3859 3860 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3861 struct ieee80211_txq *txq) 3862 { 3863 struct ieee80211_local *local = hw_to_local(hw); 3864 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3865 struct ieee80211_hdr *hdr; 3866 struct sk_buff *skb = NULL; 3867 struct fq *fq = &local->fq; 3868 struct fq_tin *tin = &txqi->tin; 3869 struct ieee80211_tx_info *info; 3870 struct ieee80211_tx_data tx; 3871 ieee80211_tx_result r; 3872 struct ieee80211_vif *vif = txq->vif; 3873 int q = vif->hw_queue[txq->ac]; 3874 unsigned long flags; 3875 bool q_stopped; 3876 3877 WARN_ON_ONCE(softirq_count() == 0); 3878 3879 if (!ieee80211_txq_airtime_check(hw, txq)) 3880 return NULL; 3881 3882 begin: 3883 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3884 q_stopped = local->queue_stop_reasons[q]; 3885 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3886 3887 if (unlikely(q_stopped)) { 3888 /* mark for waking later */ 3889 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3890 return NULL; 3891 } 3892 3893 spin_lock_bh(&fq->lock); 3894 3895 /* Make sure fragments stay together. */ 3896 skb = __skb_dequeue(&txqi->frags); 3897 if (unlikely(skb)) { 3898 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3899 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3900 goto out; 3901 IEEE80211_SKB_CB(skb)->control.flags &= 3902 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3903 } else { 3904 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3905 goto out; 3906 3907 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3908 } 3909 3910 if (!skb) 3911 goto out; 3912 3913 spin_unlock_bh(&fq->lock); 3914 3915 hdr = (struct ieee80211_hdr *)skb->data; 3916 info = IEEE80211_SKB_CB(skb); 3917 3918 memset(&tx, 0, sizeof(tx)); 3919 __skb_queue_head_init(&tx.skbs); 3920 tx.local = local; 3921 tx.skb = skb; 3922 tx.sdata = vif_to_sdata(info->control.vif); 3923 3924 if (txq->sta) { 3925 tx.sta = container_of(txq->sta, struct sta_info, sta); 3926 /* 3927 * Drop unicast frames to unauthorised stations unless they are 3928 * injected frames or EAPOL frames from the local station. 3929 */ 3930 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3931 ieee80211_is_data_present(hdr->frame_control) && 3932 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3933 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3934 !is_multicast_ether_addr(hdr->addr1) && 3935 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3936 (!(info->control.flags & 3937 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3938 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3939 NULL)))) { 3940 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3941 ieee80211_free_txskb(&local->hw, skb); 3942 goto begin; 3943 } 3944 } 3945 3946 /* 3947 * The key can be removed while the packet was queued, so need to call 3948 * this here to get the current key. 3949 */ 3950 info->control.hw_key = NULL; 3951 r = ieee80211_tx_h_select_key(&tx); 3952 if (r != TX_CONTINUE) { 3953 ieee80211_free_txskb(&local->hw, skb); 3954 goto begin; 3955 } 3956 3957 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3958 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3959 IEEE80211_TX_CTL_DONTFRAG); 3960 3961 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3962 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3963 r = ieee80211_tx_h_rate_ctrl(&tx); 3964 if (r != TX_CONTINUE) { 3965 ieee80211_free_txskb(&local->hw, skb); 3966 goto begin; 3967 } 3968 } 3969 goto encap_out; 3970 } 3971 3972 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3973 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3974 sta); 3975 u8 pn_offs = 0; 3976 3977 if (tx.key && 3978 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3979 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3980 3981 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3982 tx.key, &tx); 3983 if (r != TX_CONTINUE) { 3984 ieee80211_free_txskb(&local->hw, skb); 3985 goto begin; 3986 } 3987 } else { 3988 if (invoke_tx_handlers_late(&tx)) 3989 goto begin; 3990 3991 skb = __skb_dequeue(&tx.skbs); 3992 info = IEEE80211_SKB_CB(skb); 3993 3994 if (!skb_queue_empty(&tx.skbs)) { 3995 spin_lock_bh(&fq->lock); 3996 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3997 spin_unlock_bh(&fq->lock); 3998 } 3999 } 4000 4001 if (skb_has_frag_list(skb) && 4002 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 4003 if (skb_linearize(skb)) { 4004 ieee80211_free_txskb(&local->hw, skb); 4005 goto begin; 4006 } 4007 } 4008 4009 switch (tx.sdata->vif.type) { 4010 case NL80211_IFTYPE_MONITOR: 4011 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 4012 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 4013 vif = &tx.sdata->vif; 4014 break; 4015 } 4016 tx.sdata = rcu_dereference(local->monitor_sdata); 4017 if (tx.sdata && 4018 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 4019 vif = &tx.sdata->vif; 4020 info->hw_queue = 4021 vif->hw_queue[skb_get_queue_mapping(skb)]; 4022 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 4023 ieee80211_free_txskb(&local->hw, skb); 4024 goto begin; 4025 } else { 4026 info->control.vif = NULL; 4027 return skb; 4028 } 4029 break; 4030 case NL80211_IFTYPE_AP_VLAN: 4031 tx.sdata = container_of(tx.sdata->bss, 4032 struct ieee80211_sub_if_data, u.ap); 4033 fallthrough; 4034 default: 4035 vif = &tx.sdata->vif; 4036 break; 4037 } 4038 4039 encap_out: 4040 info->control.vif = vif; 4041 4042 if (tx.sta && 4043 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 4044 bool ampdu = txq->ac != IEEE80211_AC_VO; 4045 u32 airtime; 4046 4047 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 4048 skb->len, ampdu); 4049 if (airtime) { 4050 airtime = ieee80211_info_set_tx_time_est(info, airtime); 4051 ieee80211_sta_update_pending_airtime(local, tx.sta, 4052 txq->ac, 4053 airtime, 4054 false); 4055 } 4056 } 4057 4058 return skb; 4059 4060 out: 4061 spin_unlock_bh(&fq->lock); 4062 4063 return skb; 4064 } 4065 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4066 4067 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4068 { 4069 struct airtime_info *air_info = &sta->airtime[ac]; 4070 4071 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4072 } 4073 4074 static void 4075 ieee80211_txq_set_active(struct txq_info *txqi) 4076 { 4077 struct sta_info *sta; 4078 4079 if (!txqi->txq.sta) 4080 return; 4081 4082 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4083 sta->airtime[txqi->txq.ac].last_active = jiffies; 4084 } 4085 4086 static bool 4087 ieee80211_txq_keep_active(struct txq_info *txqi) 4088 { 4089 struct sta_info *sta; 4090 4091 if (!txqi->txq.sta) 4092 return false; 4093 4094 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4095 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4096 return false; 4097 4098 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4099 } 4100 4101 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4102 { 4103 struct ieee80211_local *local = hw_to_local(hw); 4104 struct ieee80211_txq *ret = NULL; 4105 struct txq_info *txqi = NULL, *head = NULL; 4106 bool found_eligible_txq = false; 4107 4108 spin_lock_bh(&local->active_txq_lock[ac]); 4109 4110 if (!local->schedule_round[ac]) 4111 goto out; 4112 4113 begin: 4114 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4115 struct txq_info, 4116 schedule_order); 4117 if (!txqi) 4118 goto out; 4119 4120 if (txqi == head) { 4121 if (!found_eligible_txq) 4122 goto out; 4123 else 4124 found_eligible_txq = false; 4125 } 4126 4127 if (!head) 4128 head = txqi; 4129 4130 if (txqi->txq.sta) { 4131 struct sta_info *sta = container_of(txqi->txq.sta, 4132 struct sta_info, sta); 4133 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4134 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4135 4136 if (aql_check) 4137 found_eligible_txq = true; 4138 4139 if (deficit < 0) 4140 sta->airtime[txqi->txq.ac].deficit += 4141 sta->airtime_weight; 4142 4143 if (deficit < 0 || !aql_check) { 4144 list_move_tail(&txqi->schedule_order, 4145 &local->active_txqs[txqi->txq.ac]); 4146 goto begin; 4147 } 4148 } 4149 4150 if (txqi->schedule_round == local->schedule_round[ac]) 4151 goto out; 4152 4153 list_del_init(&txqi->schedule_order); 4154 txqi->schedule_round = local->schedule_round[ac]; 4155 ret = &txqi->txq; 4156 4157 out: 4158 spin_unlock_bh(&local->active_txq_lock[ac]); 4159 return ret; 4160 } 4161 EXPORT_SYMBOL(ieee80211_next_txq); 4162 4163 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4164 struct ieee80211_txq *txq, 4165 bool force) 4166 { 4167 struct ieee80211_local *local = hw_to_local(hw); 4168 struct txq_info *txqi = to_txq_info(txq); 4169 bool has_queue; 4170 4171 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4172 4173 has_queue = force || 4174 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4175 txq_has_queue(txq)); 4176 if (list_empty(&txqi->schedule_order) && 4177 (has_queue || ieee80211_txq_keep_active(txqi))) { 4178 /* If airtime accounting is active, always enqueue STAs at the 4179 * head of the list to ensure that they only get moved to the 4180 * back by the airtime DRR scheduler once they have a negative 4181 * deficit. A station that already has a negative deficit will 4182 * get immediately moved to the back of the list on the next 4183 * call to ieee80211_next_txq(). 4184 */ 4185 if (txqi->txq.sta && local->airtime_flags && has_queue && 4186 wiphy_ext_feature_isset(local->hw.wiphy, 4187 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4188 list_add(&txqi->schedule_order, 4189 &local->active_txqs[txq->ac]); 4190 else 4191 list_add_tail(&txqi->schedule_order, 4192 &local->active_txqs[txq->ac]); 4193 if (has_queue) 4194 ieee80211_txq_set_active(txqi); 4195 } 4196 4197 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4198 } 4199 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4200 4201 DEFINE_STATIC_KEY_FALSE(aql_disable); 4202 4203 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4204 struct ieee80211_txq *txq) 4205 { 4206 struct sta_info *sta; 4207 struct ieee80211_local *local = hw_to_local(hw); 4208 4209 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4210 return true; 4211 4212 if (static_branch_unlikely(&aql_disable)) 4213 return true; 4214 4215 if (!txq->sta) 4216 return true; 4217 4218 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4219 return true; 4220 4221 sta = container_of(txq->sta, struct sta_info, sta); 4222 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4223 sta->airtime[txq->ac].aql_limit_low) 4224 return true; 4225 4226 if (atomic_read(&local->aql_total_pending_airtime) < 4227 local->aql_threshold && 4228 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4229 sta->airtime[txq->ac].aql_limit_high) 4230 return true; 4231 4232 return false; 4233 } 4234 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4235 4236 static bool 4237 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4238 { 4239 unsigned int num_txq = 0; 4240 struct txq_info *txq; 4241 u32 aql_limit; 4242 4243 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4244 return true; 4245 4246 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4247 num_txq++; 4248 4249 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4250 local->aql_txq_limit_high[ac]; 4251 4252 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4253 } 4254 4255 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4256 struct ieee80211_txq *txq) 4257 { 4258 struct ieee80211_local *local = hw_to_local(hw); 4259 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4260 struct sta_info *sta; 4261 u8 ac = txq->ac; 4262 4263 spin_lock_bh(&local->active_txq_lock[ac]); 4264 4265 if (!txqi->txq.sta) 4266 goto out; 4267 4268 if (list_empty(&txqi->schedule_order)) 4269 goto out; 4270 4271 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4272 goto out; 4273 4274 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4275 schedule_order) { 4276 if (iter == txqi) 4277 break; 4278 4279 if (!iter->txq.sta) { 4280 list_move_tail(&iter->schedule_order, 4281 &local->active_txqs[ac]); 4282 continue; 4283 } 4284 sta = container_of(iter->txq.sta, struct sta_info, sta); 4285 if (ieee80211_sta_deficit(sta, ac) < 0) 4286 sta->airtime[ac].deficit += sta->airtime_weight; 4287 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4288 } 4289 4290 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4291 if (sta->airtime[ac].deficit >= 0) 4292 goto out; 4293 4294 sta->airtime[ac].deficit += sta->airtime_weight; 4295 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4296 spin_unlock_bh(&local->active_txq_lock[ac]); 4297 4298 return false; 4299 out: 4300 if (!list_empty(&txqi->schedule_order)) 4301 list_del_init(&txqi->schedule_order); 4302 spin_unlock_bh(&local->active_txq_lock[ac]); 4303 4304 return true; 4305 } 4306 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4307 4308 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4309 { 4310 struct ieee80211_local *local = hw_to_local(hw); 4311 4312 spin_lock_bh(&local->active_txq_lock[ac]); 4313 4314 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4315 local->schedule_round[ac]++; 4316 if (!local->schedule_round[ac]) 4317 local->schedule_round[ac]++; 4318 } else { 4319 local->schedule_round[ac] = 0; 4320 } 4321 4322 spin_unlock_bh(&local->active_txq_lock[ac]); 4323 } 4324 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4325 4326 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4327 struct net_device *dev, 4328 u32 info_flags, 4329 u32 ctrl_flags, 4330 u64 *cookie) 4331 { 4332 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4333 struct ieee80211_local *local = sdata->local; 4334 struct sta_info *sta; 4335 struct sk_buff *next; 4336 int len = skb->len; 4337 4338 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4339 kfree_skb(skb); 4340 return; 4341 } 4342 4343 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4344 4345 rcu_read_lock(); 4346 4347 if (ieee80211_vif_is_mesh(&sdata->vif) && 4348 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4349 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4350 goto out; 4351 4352 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4353 goto out_free; 4354 4355 if (IS_ERR(sta)) 4356 sta = NULL; 4357 4358 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4359 ieee80211_aggr_check(sdata, sta, skb); 4360 4361 if (sta) { 4362 struct ieee80211_fast_tx *fast_tx; 4363 4364 fast_tx = rcu_dereference(sta->fast_tx); 4365 4366 if (fast_tx && 4367 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4368 goto out; 4369 } 4370 4371 /* the frame could be fragmented, software-encrypted, and other 4372 * things so we cannot really handle checksum or GSO offload. 4373 * fix it up in software before we handle anything else. 4374 */ 4375 skb = ieee80211_tx_skb_fixup(skb, 0); 4376 if (!skb) { 4377 len = 0; 4378 goto out; 4379 } 4380 4381 skb_list_walk_safe(skb, skb, next) { 4382 skb_mark_not_on_list(skb); 4383 4384 if (skb->protocol == sdata->control_port_protocol) 4385 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4386 4387 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4388 sta, ctrl_flags, cookie); 4389 if (IS_ERR(skb)) { 4390 kfree_skb_list(next); 4391 goto out; 4392 } 4393 4394 dev_sw_netstats_tx_add(dev, 1, skb->len); 4395 4396 ieee80211_xmit(sdata, sta, skb); 4397 } 4398 goto out; 4399 out_free: 4400 kfree_skb(skb); 4401 len = 0; 4402 out: 4403 if (len) 4404 ieee80211_tpt_led_trig_tx(local, len); 4405 rcu_read_unlock(); 4406 } 4407 4408 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4409 { 4410 struct ethhdr *eth; 4411 int err; 4412 4413 err = skb_ensure_writable(skb, ETH_HLEN); 4414 if (unlikely(err)) 4415 return err; 4416 4417 eth = (void *)skb->data; 4418 ether_addr_copy(eth->h_dest, sta->sta.addr); 4419 4420 return 0; 4421 } 4422 4423 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4424 struct net_device *dev) 4425 { 4426 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4427 const struct ethhdr *eth = (void *)skb->data; 4428 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4429 __be16 ethertype; 4430 4431 switch (sdata->vif.type) { 4432 case NL80211_IFTYPE_AP_VLAN: 4433 if (sdata->u.vlan.sta) 4434 return false; 4435 if (sdata->wdev.use_4addr) 4436 return false; 4437 fallthrough; 4438 case NL80211_IFTYPE_AP: 4439 /* check runtime toggle for this bss */ 4440 if (!sdata->bss->multicast_to_unicast) 4441 return false; 4442 break; 4443 default: 4444 return false; 4445 } 4446 4447 /* multicast to unicast conversion only for some payload */ 4448 ethertype = eth->h_proto; 4449 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4450 ethertype = ethvlan->h_vlan_encapsulated_proto; 4451 switch (ethertype) { 4452 case htons(ETH_P_ARP): 4453 case htons(ETH_P_IP): 4454 case htons(ETH_P_IPV6): 4455 break; 4456 default: 4457 return false; 4458 } 4459 4460 return true; 4461 } 4462 4463 static void 4464 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4465 struct sk_buff_head *queue) 4466 { 4467 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4468 struct ieee80211_local *local = sdata->local; 4469 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4470 struct sta_info *sta, *first = NULL; 4471 struct sk_buff *cloned_skb; 4472 4473 rcu_read_lock(); 4474 4475 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4476 if (sdata != sta->sdata) 4477 /* AP-VLAN mismatch */ 4478 continue; 4479 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4480 /* do not send back to source */ 4481 continue; 4482 if (!first) { 4483 first = sta; 4484 continue; 4485 } 4486 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4487 if (!cloned_skb) 4488 goto multicast; 4489 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4490 dev_kfree_skb(cloned_skb); 4491 goto multicast; 4492 } 4493 __skb_queue_tail(queue, cloned_skb); 4494 } 4495 4496 if (likely(first)) { 4497 if (unlikely(ieee80211_change_da(skb, first))) 4498 goto multicast; 4499 __skb_queue_tail(queue, skb); 4500 } else { 4501 /* no STA connected, drop */ 4502 kfree_skb(skb); 4503 skb = NULL; 4504 } 4505 4506 goto out; 4507 multicast: 4508 __skb_queue_purge(queue); 4509 __skb_queue_tail(queue, skb); 4510 out: 4511 rcu_read_unlock(); 4512 } 4513 4514 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4515 struct sk_buff *skb, u32 ctrl_flags, 4516 unsigned int link_id) 4517 { 4518 struct sk_buff *out; 4519 4520 out = skb_copy(skb, GFP_ATOMIC); 4521 if (!out) 4522 return; 4523 4524 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4525 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4526 } 4527 4528 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4529 struct sk_buff *skb) 4530 { 4531 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4532 unsigned long links = sdata->vif.active_links; 4533 unsigned int link; 4534 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4535 4536 if (hweight16(links) == 1) { 4537 ctrl_flags |= u32_encode_bits(__ffs(links), 4538 IEEE80211_TX_CTRL_MLO_LINK); 4539 4540 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4541 NULL); 4542 return; 4543 } 4544 4545 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4546 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4547 ctrl_flags = 0; 4548 } 4549 kfree_skb(skb); 4550 } 4551 4552 /** 4553 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4554 * @skb: packet to be sent 4555 * @dev: incoming interface 4556 * 4557 * On failure skb will be freed. 4558 * 4559 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4560 */ 4561 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4562 struct net_device *dev) 4563 { 4564 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4565 const struct ethhdr *eth = (void *)skb->data; 4566 4567 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4568 goto normal; 4569 4570 if (unlikely(!ieee80211_sdata_running(sdata))) { 4571 kfree_skb(skb); 4572 return NETDEV_TX_OK; 4573 } 4574 4575 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4576 struct sk_buff_head queue; 4577 4578 __skb_queue_head_init(&queue); 4579 ieee80211_convert_to_unicast(skb, dev, &queue); 4580 while ((skb = __skb_dequeue(&queue))) 4581 __ieee80211_subif_start_xmit(skb, dev, 0, 4582 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4583 NULL); 4584 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4585 ((sdata->vif.type == NL80211_IFTYPE_AP && 4586 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4587 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4588 !sdata->wdev.use_4addr))) { 4589 ieee80211_mlo_multicast_tx(dev, skb); 4590 } else { 4591 normal: 4592 __ieee80211_subif_start_xmit(skb, dev, 0, 4593 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4594 NULL); 4595 } 4596 4597 return NETDEV_TX_OK; 4598 } 4599 4600 4601 4602 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4603 struct sk_buff *skb, struct sta_info *sta, 4604 bool txpending) 4605 { 4606 struct ieee80211_local *local = sdata->local; 4607 struct ieee80211_tx_control control = {}; 4608 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4609 struct ieee80211_sta *pubsta = NULL; 4610 unsigned long flags; 4611 int q = info->hw_queue; 4612 4613 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4614 4615 if (local->queue_stop_reasons[q] || 4616 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4617 if (txpending) 4618 skb_queue_head(&local->pending[q], skb); 4619 else 4620 skb_queue_tail(&local->pending[q], skb); 4621 4622 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4623 4624 return false; 4625 } 4626 4627 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4628 4629 if (sta && sta->uploaded) 4630 pubsta = &sta->sta; 4631 4632 control.sta = pubsta; 4633 4634 drv_tx(local, &control, skb); 4635 4636 return true; 4637 } 4638 4639 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4640 struct sk_buff *skb, struct sta_info *sta, 4641 bool txpending) 4642 { 4643 struct ieee80211_local *local = sdata->local; 4644 struct sk_buff *next; 4645 bool ret = true; 4646 4647 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4648 return true; 4649 4650 skb_list_walk_safe(skb, skb, next) { 4651 skb_mark_not_on_list(skb); 4652 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4653 ret = false; 4654 } 4655 4656 return ret; 4657 } 4658 4659 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4660 struct net_device *dev, struct sta_info *sta, 4661 struct ieee80211_key *key, struct sk_buff *skb) 4662 { 4663 struct ieee80211_tx_info *info; 4664 struct ieee80211_local *local = sdata->local; 4665 struct tid_ampdu_tx *tid_tx = NULL; 4666 struct sk_buff *seg, *next; 4667 unsigned int skbs = 0, len = 0; 4668 u16 queue; 4669 u8 tid; 4670 4671 queue = ieee80211_select_queue(sdata, sta, skb); 4672 skb_set_queue_mapping(skb, queue); 4673 4674 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4675 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4676 goto out_free; 4677 4678 skb = skb_share_check(skb, GFP_ATOMIC); 4679 if (unlikely(!skb)) 4680 return; 4681 4682 ieee80211_aggr_check(sdata, sta, skb); 4683 4684 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4685 4686 if (sta) 4687 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4688 if (tid_tx) { 4689 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4690 /* fall back to non-offload slow path */ 4691 __ieee80211_subif_start_xmit(skb, dev, 0, 4692 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4693 NULL); 4694 return; 4695 } 4696 4697 if (tid_tx->timeout) 4698 tid_tx->last_tx = jiffies; 4699 } 4700 4701 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4702 if (!skb) 4703 return; 4704 4705 info = IEEE80211_SKB_CB(skb); 4706 memset(info, 0, sizeof(*info)); 4707 4708 info->hw_queue = sdata->vif.hw_queue[queue]; 4709 4710 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4711 sdata = container_of(sdata->bss, 4712 struct ieee80211_sub_if_data, u.ap); 4713 4714 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4715 info->control.vif = &sdata->vif; 4716 4717 if (key) 4718 info->control.hw_key = &key->conf; 4719 4720 skb_list_walk_safe(skb, seg, next) { 4721 skbs++; 4722 len += seg->len; 4723 if (seg != skb) 4724 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4725 } 4726 4727 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4728 info->status_data = ieee80211_store_ack_skb(local, skb, 4729 &info->flags, NULL); 4730 if (info->status_data) 4731 info->status_data_idr = 1; 4732 } 4733 4734 dev_sw_netstats_tx_add(dev, skbs, len); 4735 4736 if (sta) { 4737 sta->deflink.tx_stats.packets[queue] += skbs; 4738 sta->deflink.tx_stats.bytes[queue] += len; 4739 } 4740 4741 ieee80211_tpt_led_trig_tx(local, len); 4742 4743 ieee80211_tx_8023(sdata, skb, sta, false); 4744 4745 return; 4746 4747 out_free: 4748 kfree_skb(skb); 4749 } 4750 4751 static bool ieee80211_check_mcast_offload(struct ieee80211_sub_if_data *sdata, 4752 struct sk_buff *skb) 4753 { 4754 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4755 4756 if ((ieee80211_vif_is_mld(&sdata->vif) && 4757 (sdata->vif.type == NL80211_IFTYPE_AP && 4758 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX))) || 4759 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4760 !sdata->wdev.use_4addr)) 4761 return false; 4762 4763 if (!is_multicast_ether_addr(skb->data) || 4764 !(sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_MCAST) || 4765 sdata->control_port_protocol == ehdr->h_proto) 4766 return false; 4767 4768 return true; 4769 } 4770 4771 static void __ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4772 struct net_device *dev) 4773 { 4774 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4775 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4776 struct ieee80211_link_data *link; 4777 struct ieee80211_key *key; 4778 struct sta_info *sta; 4779 4780 rcu_read_lock(); 4781 4782 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4783 kfree_skb(skb); 4784 goto out; 4785 } 4786 4787 /* 4788 * If STA is invalid, use the multicast offload path when applicable. 4789 * In AP mode, drop the frame if there are no associated stations; 4790 * otherwise use the default link and multicast key for transmission. 4791 */ 4792 if (unlikely(IS_ERR_OR_NULL(sta) && 4793 ieee80211_check_mcast_offload(sdata, skb))) { 4794 sta = NULL; 4795 if (ieee80211_vif_get_num_mcast_if(sdata) <= 0) { 4796 /* No associated STAs - no need to send multicast frames. */ 4797 kfree_skb(skb); 4798 goto out; 4799 } 4800 link = &sdata->deflink; 4801 key = rcu_dereference(link->default_multicast_key); 4802 } else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4803 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4804 sdata->control_port_protocol == ehdr->h_proto)) { 4805 goto skip_offload; 4806 } else { 4807 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4808 if (!key) 4809 key = rcu_dereference(sdata->default_unicast_key); 4810 } 4811 4812 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4813 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4814 goto skip_offload; 4815 4816 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4817 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4818 goto out; 4819 4820 skip_offload: 4821 ieee80211_subif_start_xmit(skb, dev); 4822 out: 4823 rcu_read_unlock(); 4824 } 4825 4826 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4827 struct net_device *dev) 4828 { 4829 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4830 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4831 4832 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4833 kfree_skb(skb); 4834 return NETDEV_TX_OK; 4835 } 4836 4837 if (unlikely(is_multicast_ether_addr(ehdr->h_dest) && 4838 ieee80211_multicast_to_unicast(skb, dev))) { 4839 struct sk_buff_head queue; 4840 4841 __skb_queue_head_init(&queue); 4842 ieee80211_convert_to_unicast(skb, dev, &queue); 4843 while ((skb = __skb_dequeue(&queue))) 4844 __ieee80211_subif_start_xmit_8023(skb, dev); 4845 } else { 4846 __ieee80211_subif_start_xmit_8023(skb, dev); 4847 } 4848 4849 return NETDEV_TX_OK; 4850 } 4851 4852 struct sk_buff * 4853 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4854 struct sk_buff *skb, u32 info_flags) 4855 { 4856 struct ieee80211_hdr *hdr; 4857 struct ieee80211_tx_data tx = { 4858 .local = sdata->local, 4859 .sdata = sdata, 4860 }; 4861 struct sta_info *sta; 4862 4863 rcu_read_lock(); 4864 4865 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4866 kfree_skb(skb); 4867 skb = ERR_PTR(-EINVAL); 4868 goto out; 4869 } 4870 4871 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4872 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4873 if (IS_ERR(skb)) 4874 goto out; 4875 4876 hdr = (void *)skb->data; 4877 tx.sta = sta_info_get(sdata, hdr->addr1); 4878 tx.skb = skb; 4879 4880 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4881 rcu_read_unlock(); 4882 kfree_skb(skb); 4883 return ERR_PTR(-EINVAL); 4884 } 4885 4886 out: 4887 rcu_read_unlock(); 4888 return skb; 4889 } 4890 4891 /* 4892 * ieee80211_clear_tx_pending may not be called in a context where 4893 * it is possible that it packets could come in again. 4894 */ 4895 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4896 { 4897 struct sk_buff *skb; 4898 int i; 4899 4900 for (i = 0; i < local->hw.queues; i++) { 4901 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4902 ieee80211_free_txskb(&local->hw, skb); 4903 } 4904 } 4905 4906 /* 4907 * Returns false if the frame couldn't be transmitted but was queued instead, 4908 * which in this case means re-queued -- take as an indication to stop sending 4909 * more pending frames. 4910 */ 4911 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4912 struct sk_buff *skb) 4913 { 4914 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4915 struct ieee80211_sub_if_data *sdata; 4916 struct sta_info *sta; 4917 struct ieee80211_hdr *hdr; 4918 bool result; 4919 struct ieee80211_chanctx_conf *chanctx_conf; 4920 4921 sdata = vif_to_sdata(info->control.vif); 4922 4923 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4924 /* update band only for non-MLD */ 4925 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4926 chanctx_conf = 4927 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4928 if (unlikely(!chanctx_conf)) { 4929 dev_kfree_skb(skb); 4930 return true; 4931 } 4932 info->band = chanctx_conf->def.chan->band; 4933 } 4934 result = ieee80211_tx(sdata, NULL, skb, true); 4935 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4936 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4937 dev_kfree_skb(skb); 4938 return true; 4939 } 4940 4941 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4942 sta = NULL; 4943 4944 result = ieee80211_tx_8023(sdata, skb, sta, true); 4945 } else { 4946 struct sk_buff_head skbs; 4947 4948 __skb_queue_head_init(&skbs); 4949 __skb_queue_tail(&skbs, skb); 4950 4951 hdr = (struct ieee80211_hdr *)skb->data; 4952 sta = sta_info_get(sdata, hdr->addr1); 4953 4954 result = __ieee80211_tx(local, &skbs, sta, true); 4955 } 4956 4957 return result; 4958 } 4959 4960 /* 4961 * Transmit all pending packets. Called from tasklet. 4962 */ 4963 void ieee80211_tx_pending(struct tasklet_struct *t) 4964 { 4965 struct ieee80211_local *local = from_tasklet(local, t, 4966 tx_pending_tasklet); 4967 unsigned long flags; 4968 int i; 4969 bool txok; 4970 4971 rcu_read_lock(); 4972 4973 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4974 for (i = 0; i < local->hw.queues; i++) { 4975 /* 4976 * If queue is stopped by something other than due to pending 4977 * frames, or we have no pending frames, proceed to next queue. 4978 */ 4979 if (local->queue_stop_reasons[i] || 4980 skb_queue_empty(&local->pending[i])) 4981 continue; 4982 4983 while (!skb_queue_empty(&local->pending[i])) { 4984 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4985 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4986 4987 if (WARN_ON(!info->control.vif)) { 4988 ieee80211_free_txskb(&local->hw, skb); 4989 continue; 4990 } 4991 4992 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4993 flags); 4994 4995 txok = ieee80211_tx_pending_skb(local, skb); 4996 spin_lock_irqsave(&local->queue_stop_reason_lock, 4997 flags); 4998 if (!txok) 4999 break; 5000 } 5001 } 5002 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 5003 5004 rcu_read_unlock(); 5005 } 5006 5007 /* functions for drivers to get certain frames */ 5008 5009 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 5010 struct sk_buff *skb, 5011 bool mcast_traffic) 5012 { 5013 int i, n1 = 0, n2; 5014 5015 /* 5016 * Find largest even number N1 so that bits numbered 1 through 5017 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 5018 * (N2 + 1) x 8 through 2007 are 0. 5019 */ 5020 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 5021 if (ps->tim[i]) { 5022 n1 = i & 0xfe; 5023 break; 5024 } 5025 } 5026 n2 = n1; 5027 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 5028 if (ps->tim[i]) { 5029 n2 = i; 5030 break; 5031 } 5032 } 5033 5034 /* Bitmap control */ 5035 skb_put_u8(skb, n1 | mcast_traffic); 5036 /* Part Virt Bitmap */ 5037 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 5038 } 5039 5040 /* 5041 * mac80211 currently supports encoding using block bitmap mode, non 5042 * inversed. The current implementation supports up to 1600 AIDs. 5043 * 5044 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 5045 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 5046 * describes 8 AIDs and the presence of a subblock is determined by 5047 * the block bitmap. 5048 */ 5049 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 5050 struct sk_buff *skb, 5051 bool mcast_traffic) 5052 { 5053 int blk; 5054 5055 /* 5056 * Emit a bitmap control block with a page slice number of 31 and a 5057 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 5058 * that the entire page (2048 bits) indicated by the page index 5059 * is encoded in the partial virtual bitmap. 5060 */ 5061 skb_put_u8(skb, mcast_traffic | (31 << 1)); 5062 5063 /* Emit an encoded block for each non-zero sub-block */ 5064 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 5065 u8 blk_bmap = 0; 5066 int sblk; 5067 5068 for (sblk = 0; sblk < 8; sblk++) { 5069 int sblk_idx = blk * 8 + sblk; 5070 5071 /* 5072 * If the current subblock is non-zero, increase the 5073 * number of subblocks to emit for the current block. 5074 */ 5075 if (ps->tim[sblk_idx]) 5076 blk_bmap |= BIT(sblk); 5077 } 5078 5079 /* If the current block contains no non-zero sublocks */ 5080 if (!blk_bmap) 5081 continue; 5082 5083 /* 5084 * Emit a block control byte for the current encoded block 5085 * with an encoding mode of block bitmap (0x0), not inverse 5086 * (0x0) and the current block offset (5 bits) 5087 */ 5088 skb_put_u8(skb, blk << 3); 5089 5090 /* 5091 * Emit the block bitmap for the current encoded block which 5092 * contains the present subblocks. 5093 */ 5094 skb_put_u8(skb, blk_bmap); 5095 5096 /* Emit the present subblocks */ 5097 for (sblk = 0; sblk < 8; sblk++) { 5098 int sblk_idx = blk * 8 + sblk; 5099 5100 if (!(blk_bmap & BIT(sblk))) 5101 continue; 5102 5103 skb_put_u8(skb, ps->tim[sblk_idx]); 5104 } 5105 } 5106 } 5107 5108 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5109 struct ieee80211_link_data *link, 5110 struct ps_data *ps, struct sk_buff *skb, 5111 bool is_template) 5112 { 5113 struct element *tim; 5114 bool mcast_traffic = false, have_bits = false; 5115 struct ieee80211_bss_conf *link_conf = link->conf; 5116 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5117 5118 /* Generate bitmap for TIM only if there are any STAs in power save 5119 * mode. */ 5120 if (atomic_read(&ps->num_sta_ps) > 0) 5121 /* in the hope that this is faster than 5122 * checking byte-for-byte */ 5123 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5124 IEEE80211_MAX_AID + 1); 5125 5126 if (!is_template) { 5127 if (ps->dtim_count == 0) 5128 ps->dtim_count = link_conf->dtim_period - 1; 5129 else 5130 ps->dtim_count--; 5131 } 5132 5133 /* Length is set after parsing the AID bitmap */ 5134 tim = skb_put(skb, sizeof(struct element)); 5135 tim->id = WLAN_EID_TIM; 5136 skb_put_u8(skb, ps->dtim_count); 5137 skb_put_u8(skb, link_conf->dtim_period); 5138 5139 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5140 mcast_traffic = true; 5141 5142 ps->dtim_bc_mc = mcast_traffic; 5143 5144 if (have_bits) { 5145 if (s1g) 5146 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, 5147 mcast_traffic); 5148 else 5149 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5150 } else { 5151 /* 5152 * If there is no buffered unicast traffic for an S1G 5153 * interface, we can exclude the bitmap control. This is in 5154 * contrast to other phy types as they do include the bitmap 5155 * control and pvb even when there is no buffered traffic. 5156 */ 5157 if (!s1g) { 5158 /* Bitmap control */ 5159 skb_put_u8(skb, mcast_traffic); 5160 /* Part Virt Bitmap */ 5161 skb_put_u8(skb, 0); 5162 } 5163 } 5164 5165 tim->datalen = skb_tail_pointer(skb) - tim->data; 5166 } 5167 5168 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5169 struct ieee80211_link_data *link, 5170 struct ps_data *ps, struct sk_buff *skb, 5171 bool is_template) 5172 { 5173 struct ieee80211_local *local = sdata->local; 5174 5175 /* 5176 * Not very nice, but we want to allow the driver to call 5177 * ieee80211_beacon_get() as a response to the set_tim() 5178 * callback. That, however, is already invoked under the 5179 * sta_lock to guarantee consistent and race-free update 5180 * of the tim bitmap in mac80211 and the driver. 5181 */ 5182 if (local->tim_in_locked_section) { 5183 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5184 } else { 5185 spin_lock_bh(&local->tim_lock); 5186 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5187 spin_unlock_bh(&local->tim_lock); 5188 } 5189 5190 return 0; 5191 } 5192 5193 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5194 struct beacon_data *beacon, 5195 struct ieee80211_link_data *link) 5196 { 5197 u8 *beacon_data, count, max_count = 1; 5198 struct probe_resp *resp; 5199 size_t beacon_data_len; 5200 u16 *bcn_offsets; 5201 int i; 5202 5203 switch (sdata->vif.type) { 5204 case NL80211_IFTYPE_AP: 5205 beacon_data = beacon->tail; 5206 beacon_data_len = beacon->tail_len; 5207 break; 5208 case NL80211_IFTYPE_ADHOC: 5209 beacon_data = beacon->head; 5210 beacon_data_len = beacon->head_len; 5211 break; 5212 case NL80211_IFTYPE_MESH_POINT: 5213 beacon_data = beacon->head; 5214 beacon_data_len = beacon->head_len; 5215 break; 5216 default: 5217 return; 5218 } 5219 5220 resp = rcu_dereference(link->u.ap.probe_resp); 5221 5222 bcn_offsets = beacon->cntdwn_counter_offsets; 5223 count = beacon->cntdwn_current_counter; 5224 if (link->conf->csa_active) 5225 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5226 5227 for (i = 0; i < max_count; ++i) { 5228 if (bcn_offsets[i]) { 5229 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5230 return; 5231 beacon_data[bcn_offsets[i]] = count; 5232 } 5233 5234 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5235 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5236 5237 resp->data[resp_offsets[i]] = count; 5238 } 5239 } 5240 } 5241 5242 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5243 struct beacon_data *beacon) 5244 { 5245 if (beacon->cntdwn_current_counter == 1) { 5246 /* 5247 * Channel switch handling is done by a worker thread while 5248 * beacons get pulled from hardware timers. It's therefore 5249 * possible that software threads are slow enough to not be 5250 * able to complete CSA handling in a single beacon interval, 5251 * in which case we get here. There isn't much to do about 5252 * it, other than letting the user know that the AP isn't 5253 * behaving correctly. 5254 */ 5255 link_err_once(link, 5256 "beacon TX faster than countdown (channel/color switch) completion\n"); 5257 return 0; 5258 } 5259 5260 beacon->cntdwn_current_counter--; 5261 5262 return beacon->cntdwn_current_counter; 5263 } 5264 5265 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5266 { 5267 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5268 struct ieee80211_link_data *link; 5269 struct beacon_data *beacon = NULL; 5270 u8 count = 0; 5271 5272 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5273 return 0; 5274 5275 rcu_read_lock(); 5276 5277 link = rcu_dereference(sdata->link[link_id]); 5278 if (!link) 5279 goto unlock; 5280 5281 if (sdata->vif.type == NL80211_IFTYPE_AP) 5282 beacon = rcu_dereference(link->u.ap.beacon); 5283 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5284 beacon = rcu_dereference(sdata->u.ibss.presp); 5285 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5286 beacon = rcu_dereference(sdata->u.mesh.beacon); 5287 5288 if (!beacon) 5289 goto unlock; 5290 5291 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5292 5293 unlock: 5294 rcu_read_unlock(); 5295 return count; 5296 } 5297 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5298 5299 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5300 { 5301 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5302 struct beacon_data *beacon = NULL; 5303 5304 rcu_read_lock(); 5305 5306 if (sdata->vif.type == NL80211_IFTYPE_AP) 5307 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5308 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5309 beacon = rcu_dereference(sdata->u.ibss.presp); 5310 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5311 beacon = rcu_dereference(sdata->u.mesh.beacon); 5312 5313 if (!beacon) 5314 goto unlock; 5315 5316 if (counter < beacon->cntdwn_current_counter) 5317 beacon->cntdwn_current_counter = counter; 5318 5319 unlock: 5320 rcu_read_unlock(); 5321 } 5322 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5323 5324 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5325 unsigned int link_id) 5326 { 5327 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5328 struct ieee80211_link_data *link; 5329 struct beacon_data *beacon = NULL; 5330 u8 *beacon_data; 5331 size_t beacon_data_len; 5332 int ret = false; 5333 5334 if (!ieee80211_sdata_running(sdata)) 5335 return false; 5336 5337 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5338 return 0; 5339 5340 rcu_read_lock(); 5341 5342 link = rcu_dereference(sdata->link[link_id]); 5343 if (!link) 5344 goto out; 5345 5346 if (vif->type == NL80211_IFTYPE_AP) { 5347 beacon = rcu_dereference(link->u.ap.beacon); 5348 if (WARN_ON(!beacon || !beacon->tail)) 5349 goto out; 5350 beacon_data = beacon->tail; 5351 beacon_data_len = beacon->tail_len; 5352 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5353 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5354 5355 beacon = rcu_dereference(ifibss->presp); 5356 if (!beacon) 5357 goto out; 5358 5359 beacon_data = beacon->head; 5360 beacon_data_len = beacon->head_len; 5361 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5362 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5363 5364 beacon = rcu_dereference(ifmsh->beacon); 5365 if (!beacon) 5366 goto out; 5367 5368 beacon_data = beacon->head; 5369 beacon_data_len = beacon->head_len; 5370 } else { 5371 WARN_ON(1); 5372 goto out; 5373 } 5374 5375 if (!beacon->cntdwn_counter_offsets[0]) 5376 goto out; 5377 5378 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5379 goto out; 5380 5381 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5382 ret = true; 5383 5384 out: 5385 rcu_read_unlock(); 5386 5387 return ret; 5388 } 5389 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5390 5391 static int ieee80211_beacon_protect(struct sk_buff *skb, 5392 struct ieee80211_local *local, 5393 struct ieee80211_sub_if_data *sdata, 5394 struct ieee80211_link_data *link) 5395 { 5396 ieee80211_tx_result res; 5397 struct ieee80211_tx_data tx; 5398 struct sk_buff *check_skb; 5399 5400 memset(&tx, 0, sizeof(tx)); 5401 tx.key = rcu_dereference(link->default_beacon_key); 5402 if (!tx.key) 5403 return 0; 5404 5405 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5406 tx.key = NULL; 5407 return -EINVAL; 5408 } 5409 5410 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5411 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5412 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5413 5414 tx.local = local; 5415 tx.sdata = sdata; 5416 __skb_queue_head_init(&tx.skbs); 5417 __skb_queue_tail(&tx.skbs, skb); 5418 res = ieee80211_tx_h_encrypt(&tx); 5419 check_skb = __skb_dequeue(&tx.skbs); 5420 /* we may crash after this, but it'd be a bug in crypto */ 5421 WARN_ON(check_skb != skb); 5422 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5423 return -EINVAL; 5424 5425 return 0; 5426 } 5427 5428 int ieee80211_encrypt_tx_skb(struct sk_buff *skb) 5429 { 5430 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5431 struct ieee80211_sub_if_data *sdata = NULL; 5432 struct sk_buff *check_skb; 5433 struct ieee80211_tx_data tx; 5434 ieee80211_tx_result res; 5435 5436 if (!info->control.hw_key) 5437 return 0; 5438 5439 memset(&tx, 0, sizeof(tx)); 5440 tx.key = container_of(info->control.hw_key, struct ieee80211_key, conf); 5441 /* NULL it out now so we do full SW crypto */ 5442 info->control.hw_key = NULL; 5443 __skb_queue_head_init(&tx.skbs); 5444 __skb_queue_tail(&tx.skbs, skb); 5445 5446 if (skb->dev) 5447 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5448 else if (info->control.vif) 5449 sdata = vif_to_sdata(info->control.vif); 5450 5451 if (WARN_ON(!sdata)) 5452 return -EINVAL; 5453 5454 tx.sdata = sdata; 5455 tx.local = sdata->local; 5456 res = ieee80211_tx_h_encrypt(&tx); 5457 check_skb = __skb_dequeue(&tx.skbs); 5458 /* we may crash after this, but it'd be a bug in crypto */ 5459 WARN_ON(check_skb != skb); 5460 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5461 return -EINVAL; 5462 5463 return 0; 5464 } 5465 EXPORT_SYMBOL_GPL(ieee80211_encrypt_tx_skb); 5466 5467 static void 5468 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5469 struct ieee80211_vif *vif, 5470 struct ieee80211_link_data *link, 5471 struct ieee80211_mutable_offsets *offs, 5472 struct beacon_data *beacon, 5473 struct sk_buff *skb, 5474 struct ieee80211_chanctx_conf *chanctx_conf, 5475 u16 csa_off_base) 5476 { 5477 struct ieee80211_local *local = hw_to_local(hw); 5478 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5479 struct ieee80211_tx_info *info; 5480 enum nl80211_band band; 5481 struct ieee80211_tx_rate_control txrc; 5482 5483 /* CSA offsets */ 5484 if (offs && beacon) { 5485 u16 i; 5486 5487 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5488 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5489 5490 if (!csa_off) 5491 continue; 5492 5493 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5494 } 5495 } 5496 5497 band = chanctx_conf->def.chan->band; 5498 info = IEEE80211_SKB_CB(skb); 5499 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5500 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5501 info->band = band; 5502 5503 memset(&txrc, 0, sizeof(txrc)); 5504 txrc.hw = hw; 5505 txrc.sband = local->hw.wiphy->bands[band]; 5506 txrc.bss_conf = link->conf; 5507 txrc.skb = skb; 5508 txrc.reported_rate.idx = -1; 5509 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5510 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5511 else 5512 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5513 txrc.bss = true; 5514 rate_control_get_rate(sdata, NULL, &txrc); 5515 5516 info->control.vif = vif; 5517 info->control.flags |= u32_encode_bits(link->link_id, 5518 IEEE80211_TX_CTRL_MLO_LINK); 5519 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5520 IEEE80211_TX_CTL_ASSIGN_SEQ | 5521 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5522 } 5523 5524 static void 5525 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5526 u8 i) 5527 { 5528 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5529 i > beacon->mbssid_ies->cnt) 5530 return; 5531 5532 if (i < beacon->mbssid_ies->cnt) { 5533 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5534 beacon->mbssid_ies->elem[i].len); 5535 5536 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5537 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5538 beacon->rnr_ies->elem[i].len); 5539 5540 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5541 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5542 beacon->rnr_ies->elem[i].len); 5543 } 5544 return; 5545 } 5546 5547 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5548 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5549 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5550 beacon->mbssid_ies->elem[i].len); 5551 } 5552 5553 static struct sk_buff * 5554 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5555 struct ieee80211_vif *vif, 5556 struct ieee80211_link_data *link, 5557 struct ieee80211_mutable_offsets *offs, 5558 bool is_template, 5559 struct beacon_data *beacon, 5560 struct ieee80211_chanctx_conf *chanctx_conf, 5561 u8 ema_index) 5562 { 5563 struct ieee80211_local *local = hw_to_local(hw); 5564 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5565 struct ieee80211_if_ap *ap = &sdata->u.ap; 5566 struct sk_buff *skb = NULL; 5567 u16 csa_off_base = 0; 5568 int mbssid_len; 5569 5570 if (beacon->cntdwn_counter_offsets[0]) { 5571 if (!is_template) 5572 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5573 5574 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5575 } 5576 5577 /* headroom, head length, 5578 * tail length, maximum TIM length and multiple BSSID length 5579 */ 5580 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5581 beacon->rnr_ies, 5582 ema_index); 5583 5584 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5585 beacon->tail_len + 256 + 5586 local->hw.extra_beacon_tailroom + mbssid_len); 5587 if (!skb) 5588 return NULL; 5589 5590 skb_reserve(skb, local->tx_headroom); 5591 skb_put_data(skb, beacon->head, beacon->head_len); 5592 5593 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5594 5595 if (offs) { 5596 offs->tim_offset = beacon->head_len; 5597 offs->tim_length = skb->len - beacon->head_len; 5598 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5599 5600 if (mbssid_len) { 5601 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5602 offs->mbssid_off = skb->len - mbssid_len; 5603 } 5604 5605 /* for AP the csa offsets are from tail */ 5606 csa_off_base = skb->len; 5607 } 5608 5609 if (beacon->tail) 5610 skb_put_data(skb, beacon->tail, beacon->tail_len); 5611 5612 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5613 dev_kfree_skb(skb); 5614 return NULL; 5615 } 5616 5617 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5618 chanctx_conf, csa_off_base); 5619 return skb; 5620 } 5621 5622 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5623 struct ieee80211_link_data *link) 5624 { 5625 struct ps_data *ps = &sdata->u.ap.ps; 5626 5627 if (ps->sb_count == 0) 5628 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5629 else 5630 ps->sb_count--; 5631 5632 return ps->sb_count == 0; 5633 } 5634 5635 static struct sk_buff * 5636 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5637 struct ieee80211_vif *vif, 5638 struct ieee80211_link_data *link, 5639 struct ieee80211_chanctx_conf *chanctx_conf, 5640 struct s1g_short_beacon_data *sb, 5641 bool is_template) 5642 { 5643 struct ieee80211_local *local = hw_to_local(hw); 5644 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5645 struct ieee80211_if_ap *ap = &sdata->u.ap; 5646 struct sk_buff *skb; 5647 5648 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5649 sb->short_tail_len + 256 + 5650 local->hw.extra_beacon_tailroom); 5651 if (!skb) 5652 return NULL; 5653 5654 skb_reserve(skb, local->tx_headroom); 5655 skb_put_data(skb, sb->short_head, sb->short_head_len); 5656 5657 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5658 5659 if (sb->short_tail) 5660 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5661 5662 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5663 chanctx_conf, 0); 5664 return skb; 5665 } 5666 5667 static struct sk_buff * 5668 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5669 struct ieee80211_link_data *link, 5670 struct ieee80211_mutable_offsets *offs, 5671 bool is_template, struct beacon_data *beacon, 5672 struct ieee80211_chanctx_conf *chanctx_conf, 5673 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5674 { 5675 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5676 5677 if (!sdata->vif.cfg.s1g || !s1g_sb || 5678 ieee80211_s1g_need_long_beacon(sdata, link)) 5679 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5680 is_template, beacon, 5681 chanctx_conf, ema_index); 5682 5683 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5684 s1g_sb, is_template); 5685 } 5686 5687 static struct ieee80211_ema_beacons * 5688 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5689 struct ieee80211_vif *vif, 5690 struct ieee80211_link_data *link, 5691 struct ieee80211_mutable_offsets *offs, 5692 bool is_template, struct beacon_data *beacon, 5693 struct ieee80211_chanctx_conf *chanctx_conf) 5694 { 5695 struct ieee80211_ema_beacons *ema = NULL; 5696 5697 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5698 return NULL; 5699 5700 ema = kzalloc_flex(*ema, bcn, beacon->mbssid_ies->cnt, GFP_ATOMIC); 5701 if (!ema) 5702 return NULL; 5703 5704 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5705 ema->bcn[ema->cnt].skb = 5706 ieee80211_beacon_get_ap(hw, vif, link, 5707 &ema->bcn[ema->cnt].offs, 5708 is_template, beacon, 5709 chanctx_conf, ema->cnt, NULL); 5710 if (!ema->bcn[ema->cnt].skb) 5711 break; 5712 } 5713 5714 if (ema->cnt == beacon->mbssid_ies->cnt) 5715 return ema; 5716 5717 ieee80211_beacon_free_ema_list(ema); 5718 return NULL; 5719 } 5720 5721 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5722 5723 static struct sk_buff * 5724 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5725 struct ieee80211_vif *vif, 5726 struct ieee80211_mutable_offsets *offs, 5727 bool is_template, 5728 unsigned int link_id, 5729 int ema_index, 5730 struct ieee80211_ema_beacons **ema_beacons) 5731 { 5732 struct ieee80211_local *local = hw_to_local(hw); 5733 struct beacon_data *beacon = NULL; 5734 struct sk_buff *skb = NULL; 5735 struct ieee80211_sub_if_data *sdata = NULL; 5736 struct ieee80211_chanctx_conf *chanctx_conf; 5737 struct ieee80211_link_data *link; 5738 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5739 5740 rcu_read_lock(); 5741 5742 sdata = vif_to_sdata(vif); 5743 link = rcu_dereference(sdata->link[link_id]); 5744 if (!link) 5745 goto out; 5746 chanctx_conf = 5747 rcu_dereference(link->conf->chanctx_conf); 5748 5749 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5750 goto out; 5751 5752 if (offs) 5753 memset(offs, 0, sizeof(*offs)); 5754 5755 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5756 beacon = rcu_dereference(link->u.ap.beacon); 5757 if (!beacon) 5758 goto out; 5759 5760 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5761 s1g_short_bcn = 5762 rcu_dereference(link->u.ap.s1g_short_beacon); 5763 if (!s1g_short_bcn) 5764 goto out; 5765 } 5766 5767 if (ema_beacons) { 5768 *ema_beacons = 5769 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5770 offs, 5771 is_template, 5772 beacon, 5773 chanctx_conf); 5774 } else { 5775 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5776 if (ema_index >= beacon->mbssid_ies->cnt) 5777 goto out; /* End of MBSSID elements */ 5778 5779 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5780 ema_index = beacon->mbssid_ies->cnt; 5781 } else { 5782 ema_index = 0; 5783 } 5784 5785 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5786 is_template, beacon, 5787 chanctx_conf, ema_index, 5788 s1g_short_bcn); 5789 } 5790 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5791 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5792 struct ieee80211_hdr *hdr; 5793 5794 beacon = rcu_dereference(ifibss->presp); 5795 if (!beacon) 5796 goto out; 5797 5798 if (beacon->cntdwn_counter_offsets[0]) { 5799 if (!is_template) 5800 __ieee80211_beacon_update_cntdwn(link, beacon); 5801 5802 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5803 } 5804 5805 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5806 local->hw.extra_beacon_tailroom); 5807 if (!skb) 5808 goto out; 5809 skb_reserve(skb, local->tx_headroom); 5810 skb_put_data(skb, beacon->head, beacon->head_len); 5811 5812 hdr = (struct ieee80211_hdr *) skb->data; 5813 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5814 IEEE80211_STYPE_BEACON); 5815 5816 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5817 chanctx_conf, 0); 5818 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5819 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5820 5821 beacon = rcu_dereference(ifmsh->beacon); 5822 if (!beacon) 5823 goto out; 5824 5825 if (beacon->cntdwn_counter_offsets[0]) { 5826 if (!is_template) 5827 /* TODO: For mesh csa_counter is in TU, so 5828 * decrementing it by one isn't correct, but 5829 * for now we leave it consistent with overall 5830 * mac80211's behavior. 5831 */ 5832 __ieee80211_beacon_update_cntdwn(link, beacon); 5833 5834 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5835 } 5836 5837 if (ifmsh->sync_ops) 5838 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5839 5840 skb = dev_alloc_skb(local->tx_headroom + 5841 beacon->head_len + 5842 256 + /* TIM IE */ 5843 beacon->tail_len + 5844 local->hw.extra_beacon_tailroom); 5845 if (!skb) 5846 goto out; 5847 skb_reserve(skb, local->tx_headroom); 5848 skb_put_data(skb, beacon->head, beacon->head_len); 5849 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5850 is_template); 5851 5852 if (offs) { 5853 offs->tim_offset = beacon->head_len; 5854 offs->tim_length = skb->len - beacon->head_len; 5855 } 5856 5857 skb_put_data(skb, beacon->tail, beacon->tail_len); 5858 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5859 chanctx_conf, 0); 5860 } else { 5861 WARN_ON(1); 5862 goto out; 5863 } 5864 5865 out: 5866 rcu_read_unlock(); 5867 return skb; 5868 5869 } 5870 5871 struct sk_buff * 5872 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5873 struct ieee80211_vif *vif, 5874 struct ieee80211_mutable_offsets *offs, 5875 unsigned int link_id) 5876 { 5877 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5878 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5879 } 5880 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5881 5882 struct sk_buff * 5883 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5884 struct ieee80211_vif *vif, 5885 struct ieee80211_mutable_offsets *offs, 5886 unsigned int link_id, u8 ema_index) 5887 { 5888 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5889 NULL); 5890 } 5891 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5892 5893 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5894 { 5895 u8 i; 5896 5897 if (!ema_beacons) 5898 return; 5899 5900 for (i = 0; i < ema_beacons->cnt; i++) 5901 kfree_skb(ema_beacons->bcn[i].skb); 5902 5903 kfree(ema_beacons); 5904 } 5905 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5906 5907 struct ieee80211_ema_beacons * 5908 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5909 struct ieee80211_vif *vif, 5910 unsigned int link_id) 5911 { 5912 struct ieee80211_ema_beacons *ema_beacons = NULL; 5913 5914 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5915 &ema_beacons)); 5916 5917 return ema_beacons; 5918 } 5919 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5920 5921 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5922 struct ieee80211_vif *vif, 5923 u16 *tim_offset, u16 *tim_length, 5924 unsigned int link_id) 5925 { 5926 struct ieee80211_mutable_offsets offs = {}; 5927 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5928 link_id, 5929 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5930 NULL); 5931 struct sk_buff *copy; 5932 5933 if (!bcn) 5934 return bcn; 5935 5936 if (tim_offset) 5937 *tim_offset = offs.tim_offset; 5938 5939 if (tim_length) 5940 *tim_length = offs.tim_length; 5941 5942 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5943 !hw_to_local(hw)->monitors) 5944 return bcn; 5945 5946 /* send a copy to monitor interfaces */ 5947 copy = skb_copy(bcn, GFP_ATOMIC); 5948 if (!copy) 5949 return bcn; 5950 5951 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 5952 5953 return bcn; 5954 } 5955 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5956 5957 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5958 struct ieee80211_vif *vif) 5959 { 5960 struct sk_buff *skb = NULL; 5961 struct probe_resp *presp = NULL; 5962 struct ieee80211_hdr *hdr; 5963 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5964 5965 if (sdata->vif.type != NL80211_IFTYPE_AP) 5966 return NULL; 5967 5968 rcu_read_lock(); 5969 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5970 if (!presp) 5971 goto out; 5972 5973 skb = dev_alloc_skb(presp->len); 5974 if (!skb) 5975 goto out; 5976 5977 skb_put_data(skb, presp->data, presp->len); 5978 5979 hdr = (struct ieee80211_hdr *) skb->data; 5980 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5981 5982 out: 5983 rcu_read_unlock(); 5984 return skb; 5985 } 5986 EXPORT_SYMBOL(ieee80211_proberesp_get); 5987 5988 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5989 struct ieee80211_vif *vif, 5990 unsigned int link_id) 5991 { 5992 struct sk_buff *skb = NULL; 5993 struct fils_discovery_data *tmpl = NULL; 5994 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5995 struct ieee80211_link_data *link; 5996 5997 if (sdata->vif.type != NL80211_IFTYPE_AP) 5998 return NULL; 5999 6000 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6001 return NULL; 6002 6003 guard(rcu)(); 6004 link = rcu_dereference(sdata->link[link_id]); 6005 if (!link) 6006 return NULL; 6007 6008 tmpl = rcu_dereference(link->u.ap.fils_discovery); 6009 if (!tmpl) 6010 return NULL; 6011 6012 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6013 if (skb) { 6014 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6015 skb_put_data(skb, tmpl->data, tmpl->len); 6016 } 6017 6018 return skb; 6019 } 6020 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 6021 6022 struct sk_buff * 6023 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 6024 struct ieee80211_vif *vif, 6025 unsigned int link_id) 6026 { 6027 struct sk_buff *skb = NULL; 6028 struct unsol_bcast_probe_resp_data *tmpl = NULL; 6029 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6030 struct ieee80211_link_data *link; 6031 6032 if (sdata->vif.type != NL80211_IFTYPE_AP) 6033 return NULL; 6034 6035 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6036 return NULL; 6037 6038 guard(rcu)(); 6039 link = rcu_dereference(sdata->link[link_id]); 6040 if (!link) 6041 return NULL; 6042 6043 tmpl = rcu_dereference(link->u.ap.unsol_bcast_probe_resp); 6044 if (!tmpl) 6045 return NULL; 6046 6047 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6048 if (skb) { 6049 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6050 skb_put_data(skb, tmpl->data, tmpl->len); 6051 } 6052 6053 return skb; 6054 } 6055 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 6056 6057 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 6058 struct ieee80211_vif *vif) 6059 { 6060 struct ieee80211_sub_if_data *sdata; 6061 struct ieee80211_pspoll *pspoll; 6062 struct ieee80211_local *local; 6063 struct sk_buff *skb; 6064 6065 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6066 return NULL; 6067 6068 sdata = vif_to_sdata(vif); 6069 local = sdata->local; 6070 6071 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 6072 if (!skb) 6073 return NULL; 6074 6075 skb_reserve(skb, local->hw.extra_tx_headroom); 6076 6077 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 6078 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 6079 IEEE80211_STYPE_PSPOLL); 6080 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 6081 6082 /* aid in PS-Poll has its two MSBs each set to 1 */ 6083 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 6084 6085 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 6086 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 6087 6088 return skb; 6089 } 6090 EXPORT_SYMBOL(ieee80211_pspoll_get); 6091 6092 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 6093 struct ieee80211_vif *vif, 6094 int link_id, bool qos_ok) 6095 { 6096 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6097 struct ieee80211_local *local = sdata->local; 6098 struct ieee80211_link_data *link = NULL; 6099 struct ieee80211_hdr_3addr *nullfunc; 6100 struct sk_buff *skb; 6101 bool qos = false; 6102 6103 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6104 return NULL; 6105 6106 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6107 sizeof(*nullfunc) + 2); 6108 if (!skb) 6109 return NULL; 6110 6111 rcu_read_lock(); 6112 if (qos_ok) { 6113 struct sta_info *sta; 6114 6115 sta = sta_info_get(sdata, vif->cfg.ap_addr); 6116 qos = sta && sta->sta.wme; 6117 } 6118 6119 if (link_id >= 0) { 6120 link = rcu_dereference(sdata->link[link_id]); 6121 if (WARN_ON_ONCE(!link)) { 6122 rcu_read_unlock(); 6123 kfree_skb(skb); 6124 return NULL; 6125 } 6126 } 6127 6128 skb_reserve(skb, local->hw.extra_tx_headroom); 6129 6130 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 6131 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 6132 IEEE80211_STYPE_NULLFUNC | 6133 IEEE80211_FCTL_TODS); 6134 if (qos) { 6135 __le16 qoshdr = cpu_to_le16(7); 6136 6137 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 6138 IEEE80211_STYPE_NULLFUNC) != 6139 IEEE80211_STYPE_QOS_NULLFUNC); 6140 nullfunc->frame_control |= 6141 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 6142 skb->priority = 7; 6143 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 6144 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 6145 } 6146 6147 if (link) { 6148 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 6149 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 6150 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 6151 } else { 6152 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 6153 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 6154 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 6155 } 6156 rcu_read_unlock(); 6157 6158 return skb; 6159 } 6160 EXPORT_SYMBOL(ieee80211_nullfunc_get); 6161 6162 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 6163 const u8 *src_addr, 6164 const u8 *ssid, size_t ssid_len, 6165 size_t tailroom) 6166 { 6167 struct ieee80211_local *local = hw_to_local(hw); 6168 struct ieee80211_hdr_3addr *hdr; 6169 struct sk_buff *skb; 6170 size_t ie_ssid_len; 6171 u8 *pos; 6172 6173 ie_ssid_len = 2 + ssid_len; 6174 6175 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6176 ie_ssid_len + tailroom); 6177 if (!skb) 6178 return NULL; 6179 6180 skb_reserve(skb, local->hw.extra_tx_headroom); 6181 6182 hdr = skb_put_zero(skb, sizeof(*hdr)); 6183 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6184 IEEE80211_STYPE_PROBE_REQ); 6185 eth_broadcast_addr(hdr->addr1); 6186 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6187 eth_broadcast_addr(hdr->addr3); 6188 6189 pos = skb_put(skb, ie_ssid_len); 6190 *pos++ = WLAN_EID_SSID; 6191 *pos++ = ssid_len; 6192 if (ssid_len) 6193 memcpy(pos, ssid, ssid_len); 6194 pos += ssid_len; 6195 6196 return skb; 6197 } 6198 EXPORT_SYMBOL(ieee80211_probereq_get); 6199 6200 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6201 const void *frame, size_t frame_len, 6202 const struct ieee80211_tx_info *frame_txctl, 6203 struct ieee80211_rts *rts) 6204 { 6205 const struct ieee80211_hdr *hdr = frame; 6206 6207 rts->frame_control = 6208 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6209 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6210 frame_txctl); 6211 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6212 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6213 } 6214 EXPORT_SYMBOL(ieee80211_rts_get); 6215 6216 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6217 const void *frame, size_t frame_len, 6218 const struct ieee80211_tx_info *frame_txctl, 6219 struct ieee80211_cts *cts) 6220 { 6221 const struct ieee80211_hdr *hdr = frame; 6222 6223 cts->frame_control = 6224 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6225 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6226 frame_len, frame_txctl); 6227 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6228 } 6229 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6230 6231 struct sk_buff * 6232 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6233 struct ieee80211_vif *vif) 6234 { 6235 struct ieee80211_local *local = hw_to_local(hw); 6236 struct sk_buff *skb = NULL; 6237 struct ieee80211_tx_data tx; 6238 struct ieee80211_sub_if_data *sdata; 6239 struct ps_data *ps; 6240 struct ieee80211_tx_info *info; 6241 struct ieee80211_chanctx_conf *chanctx_conf; 6242 6243 sdata = vif_to_sdata(vif); 6244 6245 rcu_read_lock(); 6246 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6247 6248 if (!chanctx_conf) 6249 goto out; 6250 6251 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6252 struct beacon_data *beacon = 6253 rcu_dereference(sdata->deflink.u.ap.beacon); 6254 6255 if (!beacon || !beacon->head) 6256 goto out; 6257 6258 ps = &sdata->u.ap.ps; 6259 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6260 ps = &sdata->u.mesh.ps; 6261 } else { 6262 goto out; 6263 } 6264 6265 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6266 goto out; /* send buffered bc/mc only after DTIM beacon */ 6267 6268 while (1) { 6269 skb = skb_dequeue(&ps->bc_buf); 6270 if (!skb) 6271 goto out; 6272 local->total_ps_buffered--; 6273 6274 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6275 struct ieee80211_hdr *hdr = 6276 (struct ieee80211_hdr *) skb->data; 6277 /* more buffered multicast/broadcast frames ==> set 6278 * MoreData flag in IEEE 802.11 header to inform PS 6279 * STAs */ 6280 hdr->frame_control |= 6281 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6282 } 6283 6284 if (sdata->vif.type == NL80211_IFTYPE_AP) 6285 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6286 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6287 break; 6288 ieee80211_free_txskb(hw, skb); 6289 } 6290 6291 info = IEEE80211_SKB_CB(skb); 6292 6293 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6294 info->band = chanctx_conf->def.chan->band; 6295 6296 if (invoke_tx_handlers(&tx)) 6297 skb = NULL; 6298 out: 6299 rcu_read_unlock(); 6300 6301 return skb; 6302 } 6303 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6304 6305 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6306 { 6307 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6308 struct ieee80211_sub_if_data *sdata = sta->sdata; 6309 struct ieee80211_local *local = sdata->local; 6310 int ret; 6311 u32 queues; 6312 6313 lockdep_assert_wiphy(local->hw.wiphy); 6314 6315 /* only some cases are supported right now */ 6316 switch (sdata->vif.type) { 6317 case NL80211_IFTYPE_STATION: 6318 case NL80211_IFTYPE_AP: 6319 case NL80211_IFTYPE_AP_VLAN: 6320 break; 6321 default: 6322 WARN_ON(1); 6323 return -EINVAL; 6324 } 6325 6326 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6327 return -EINVAL; 6328 6329 if (sta->reserved_tid == tid) { 6330 ret = 0; 6331 goto out; 6332 } 6333 6334 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6335 sdata_err(sdata, "TID reservation already active\n"); 6336 ret = -EALREADY; 6337 goto out; 6338 } 6339 6340 ieee80211_stop_vif_queues(sdata->local, sdata, 6341 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6342 6343 synchronize_net(); 6344 6345 /* Tear down BA sessions so we stop aggregating on this TID */ 6346 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6347 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6348 __ieee80211_stop_tx_ba_session(sta, tid, 6349 AGG_STOP_LOCAL_REQUEST); 6350 } 6351 6352 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6353 __ieee80211_flush_queues(local, sdata, queues, false); 6354 6355 sta->reserved_tid = tid; 6356 6357 ieee80211_wake_vif_queues(local, sdata, 6358 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6359 6360 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6361 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6362 6363 ret = 0; 6364 out: 6365 return ret; 6366 } 6367 EXPORT_SYMBOL(ieee80211_reserve_tid); 6368 6369 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6370 { 6371 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6372 struct ieee80211_sub_if_data *sdata = sta->sdata; 6373 6374 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6375 6376 /* only some cases are supported right now */ 6377 switch (sdata->vif.type) { 6378 case NL80211_IFTYPE_STATION: 6379 case NL80211_IFTYPE_AP: 6380 case NL80211_IFTYPE_AP_VLAN: 6381 break; 6382 default: 6383 WARN_ON(1); 6384 return; 6385 } 6386 6387 if (tid != sta->reserved_tid) { 6388 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6389 return; 6390 } 6391 6392 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6393 } 6394 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6395 6396 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6397 struct sk_buff *skb, int tid, int link_id, 6398 enum nl80211_band band) 6399 { 6400 const struct ieee80211_hdr *hdr = (void *)skb->data; 6401 int ac = ieee80211_ac_from_tid(tid); 6402 unsigned int link; 6403 6404 skb_reset_mac_header(skb); 6405 skb_set_queue_mapping(skb, ac); 6406 skb->priority = tid; 6407 6408 skb->dev = sdata->dev; 6409 6410 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6411 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6412 IEEE80211_LINK_UNSPECIFIED)); 6413 6414 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6415 link = 0; 6416 } else if (link_id >= 0) { 6417 link = link_id; 6418 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6419 /* address from the MLD */ 6420 link = IEEE80211_LINK_UNSPECIFIED; 6421 } else { 6422 /* otherwise must be addressed from a link */ 6423 rcu_read_lock(); 6424 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6425 struct ieee80211_bss_conf *link_conf; 6426 6427 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6428 if (!link_conf) 6429 continue; 6430 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6431 break; 6432 } 6433 rcu_read_unlock(); 6434 6435 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6436 link = ffs(sdata->vif.active_links) - 1; 6437 } 6438 6439 IEEE80211_SKB_CB(skb)->control.flags |= 6440 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6441 6442 /* 6443 * The other path calling ieee80211_xmit is from the tasklet, 6444 * and while we can handle concurrent transmissions locking 6445 * requirements are that we do not come into tx with bhs on. 6446 */ 6447 local_bh_disable(); 6448 IEEE80211_SKB_CB(skb)->band = band; 6449 ieee80211_xmit(sdata, NULL, skb); 6450 local_bh_enable(); 6451 } 6452 6453 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6454 struct sk_buff *skb, int tid, int link_id) 6455 { 6456 struct ieee80211_chanctx_conf *chanctx_conf; 6457 enum nl80211_band band; 6458 6459 rcu_read_lock(); 6460 if (sdata->vif.type == NL80211_IFTYPE_NAN || 6461 sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 6462 band = NUM_NL80211_BANDS; 6463 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6464 WARN_ON(link_id >= 0); 6465 chanctx_conf = 6466 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6467 if (WARN_ON(!chanctx_conf)) { 6468 rcu_read_unlock(); 6469 kfree_skb(skb); 6470 return; 6471 } 6472 band = chanctx_conf->def.chan->band; 6473 } else { 6474 WARN_ON(link_id >= 0 && 6475 !(sdata->vif.active_links & BIT(link_id))); 6476 /* MLD transmissions must not rely on the band */ 6477 band = 0; 6478 } 6479 6480 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6481 rcu_read_unlock(); 6482 } 6483 6484 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6485 const u8 *buf, size_t len, 6486 const u8 *dest, __be16 proto, bool unencrypted, 6487 int link_id, u64 *cookie) 6488 { 6489 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6490 struct ieee80211_local *local = sdata->local; 6491 struct sta_info *sta; 6492 struct sk_buff *skb; 6493 struct ethhdr *ehdr; 6494 u32 ctrl_flags = 0; 6495 u32 flags = 0; 6496 int err; 6497 6498 /* mutex lock is only needed for incrementing the cookie counter */ 6499 lockdep_assert_wiphy(local->hw.wiphy); 6500 6501 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6502 * or Pre-Authentication 6503 */ 6504 if (proto != sdata->control_port_protocol && 6505 proto != cpu_to_be16(ETH_P_PREAUTH)) 6506 return -EINVAL; 6507 6508 if (proto == sdata->control_port_protocol) 6509 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6510 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6511 6512 if (unencrypted) 6513 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6514 6515 if (cookie) 6516 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6517 6518 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6519 6520 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6521 sizeof(struct ethhdr) + len); 6522 if (!skb) 6523 return -ENOMEM; 6524 6525 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6526 6527 skb_put_data(skb, buf, len); 6528 6529 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6530 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6531 6532 /* we may override the SA for MLO STA later */ 6533 if (link_id < 0) { 6534 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6535 IEEE80211_TX_CTRL_MLO_LINK); 6536 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6537 } else { 6538 struct ieee80211_bss_conf *link_conf; 6539 6540 ctrl_flags |= u32_encode_bits(link_id, 6541 IEEE80211_TX_CTRL_MLO_LINK); 6542 6543 rcu_read_lock(); 6544 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6545 if (!link_conf) { 6546 dev_kfree_skb(skb); 6547 rcu_read_unlock(); 6548 return -ENOLINK; 6549 } 6550 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6551 rcu_read_unlock(); 6552 } 6553 6554 ehdr->h_proto = proto; 6555 6556 skb->dev = dev; 6557 skb->protocol = proto; 6558 skb_reset_network_header(skb); 6559 skb_reset_mac_header(skb); 6560 6561 if (local->hw.queues < IEEE80211_NUM_ACS) 6562 goto start_xmit; 6563 6564 /* update QoS header to prioritize control port frames if possible, 6565 * prioritization also happens for control port frames send over 6566 * AF_PACKET 6567 */ 6568 rcu_read_lock(); 6569 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6570 if (err) { 6571 dev_kfree_skb(skb); 6572 rcu_read_unlock(); 6573 return err; 6574 } 6575 6576 if (!IS_ERR(sta)) { 6577 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6578 6579 skb_set_queue_mapping(skb, queue); 6580 6581 /* 6582 * for MLO STA, the SA should be the AP MLD address, but 6583 * the link ID has been selected already 6584 */ 6585 if (sta && sta->sta.mlo) 6586 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6587 } 6588 rcu_read_unlock(); 6589 6590 start_xmit: 6591 local_bh_disable(); 6592 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6593 local_bh_enable(); 6594 6595 return 0; 6596 } 6597 6598 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6599 const u8 *buf, size_t len) 6600 { 6601 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6602 struct ieee80211_local *local = sdata->local; 6603 struct sk_buff *skb; 6604 6605 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6606 30 + /* header size */ 6607 18); /* 11s header size */ 6608 if (!skb) 6609 return -ENOMEM; 6610 6611 skb_reserve(skb, local->hw.extra_tx_headroom); 6612 skb_put_data(skb, buf, len); 6613 6614 skb->dev = dev; 6615 skb->protocol = htons(ETH_P_802_3); 6616 skb_reset_network_header(skb); 6617 skb_reset_mac_header(skb); 6618 6619 local_bh_disable(); 6620 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6621 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6622 NULL); 6623 local_bh_enable(); 6624 6625 return 0; 6626 } 6627