1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2025 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <linux/unaligned.h> 28 #include <net/fq_impl.h> 29 #include <net/sock.h> 30 #include <net/gso.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 44 struct sk_buff *skb, int group_addr, 45 int next_frag_len) 46 { 47 int rate, mrate, erp, dur, i; 48 struct ieee80211_rate *txrate; 49 struct ieee80211_local *local = tx->local; 50 struct ieee80211_supported_band *sband; 51 struct ieee80211_hdr *hdr; 52 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 /* uh huh? */ 59 if (WARN_ON_ONCE(tx->rate.idx < 0)) 60 return 0; 61 62 if (info->band >= NUM_NL80211_BANDS) 63 return 0; 64 65 sband = local->hw.wiphy->bands[info->band]; 66 txrate = &sband->bitrates[tx->rate.idx]; 67 68 erp = txrate->flags & IEEE80211_RATE_ERP_G; 69 70 /* device is expected to do this */ 71 if (sband->band == NL80211_BAND_S1GHZ) 72 return 0; 73 74 /* 75 * data and mgmt (except PS Poll): 76 * - during CFP: 32768 77 * - during contention period: 78 * if addr1 is group address: 0 79 * if more fragments = 0 and addr1 is individual address: time to 80 * transmit one ACK plus SIFS 81 * if more fragments = 1 and addr1 is individual address: time to 82 * transmit next fragment plus 2 x ACK plus 3 x SIFS 83 * 84 * IEEE 802.11, 9.6: 85 * - control response frame (CTS or ACK) shall be transmitted using the 86 * same rate as the immediately previous frame in the frame exchange 87 * sequence, if this rate belongs to the PHY mandatory rates, or else 88 * at the highest possible rate belonging to the PHY rates in the 89 * BSSBasicRateSet 90 */ 91 hdr = (struct ieee80211_hdr *)skb->data; 92 if (ieee80211_is_ctl(hdr->frame_control)) { 93 /* TODO: These control frames are not currently sent by 94 * mac80211, but should they be implemented, this function 95 * needs to be updated to support duration field calculation. 96 * 97 * RTS: time needed to transmit pending data/mgmt frame plus 98 * one CTS frame plus one ACK frame plus 3 x SIFS 99 * CTS: duration of immediately previous RTS minus time 100 * required to transmit CTS and its SIFS 101 * ACK: 0 if immediately previous directed data/mgmt had 102 * more=0, with more=1 duration in ACK frame is duration 103 * from previous frame minus time needed to transmit ACK 104 * and its SIFS 105 * PS Poll: BIT(15) | BIT(14) | aid 106 */ 107 return 0; 108 } 109 110 /* data/mgmt */ 111 if (0 /* FIX: data/mgmt during CFP */) 112 return cpu_to_le16(32768); 113 114 if (group_addr) /* Group address as the destination - no ACK */ 115 return 0; 116 117 /* Individual destination address: 118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 119 * CTS and ACK frames shall be transmitted using the highest rate in 120 * basic rate set that is less than or equal to the rate of the 121 * immediately previous frame and that is using the same modulation 122 * (CCK or OFDM). If no basic rate set matches with these requirements, 123 * the highest mandatory rate of the PHY that is less than or equal to 124 * the rate of the previous frame is used. 125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 126 */ 127 rate = -1; 128 /* use lowest available if everything fails */ 129 mrate = sband->bitrates[0].bitrate; 130 for (i = 0; i < sband->n_bitrates; i++) { 131 struct ieee80211_rate *r = &sband->bitrates[i]; 132 u32 flag; 133 134 if (r->bitrate > txrate->bitrate) 135 break; 136 137 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 138 rate = r->bitrate; 139 140 switch (sband->band) { 141 case NL80211_BAND_2GHZ: 142 case NL80211_BAND_LC: 143 if (tx->sdata->deflink.operating_11g_mode) 144 flag = IEEE80211_RATE_MANDATORY_G; 145 else 146 flag = IEEE80211_RATE_MANDATORY_B; 147 break; 148 case NL80211_BAND_5GHZ: 149 case NL80211_BAND_6GHZ: 150 flag = IEEE80211_RATE_MANDATORY_A; 151 break; 152 default: 153 flag = 0; 154 WARN_ON(1); 155 break; 156 } 157 158 if (r->flags & flag) 159 mrate = r->bitrate; 160 } 161 if (rate == -1) { 162 /* No matching basic rate found; use highest suitable mandatory 163 * PHY rate */ 164 rate = mrate; 165 } 166 167 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 168 if (ieee80211_is_data_qos(hdr->frame_control) && 169 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 170 dur = 0; 171 else 172 /* Time needed to transmit ACK 173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 174 * to closest integer */ 175 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 176 tx->sdata->vif.bss_conf.use_short_preamble); 177 178 if (next_frag_len) { 179 /* Frame is fragmented: duration increases with time needed to 180 * transmit next fragment plus ACK and 2 x SIFS. */ 181 dur *= 2; /* ACK + SIFS */ 182 /* next fragment */ 183 dur += ieee80211_frame_duration(sband->band, next_frag_len, 184 txrate->bitrate, erp, 185 tx->sdata->vif.bss_conf.use_short_preamble); 186 } 187 188 return cpu_to_le16(dur); 189 } 190 191 /* tx handlers */ 192 static ieee80211_tx_result debug_noinline 193 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 194 { 195 struct ieee80211_local *local = tx->local; 196 struct ieee80211_if_managed *ifmgd; 197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 198 199 /* driver doesn't support power save */ 200 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 201 return TX_CONTINUE; 202 203 /* hardware does dynamic power save */ 204 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 205 return TX_CONTINUE; 206 207 /* dynamic power save disabled */ 208 if (local->hw.conf.dynamic_ps_timeout <= 0) 209 return TX_CONTINUE; 210 211 /* we are scanning, don't enable power save */ 212 if (local->scanning) 213 return TX_CONTINUE; 214 215 if (!local->ps_sdata) 216 return TX_CONTINUE; 217 218 /* No point if we're going to suspend */ 219 if (local->quiescing) 220 return TX_CONTINUE; 221 222 /* dynamic ps is supported only in managed mode */ 223 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 224 return TX_CONTINUE; 225 226 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 227 return TX_CONTINUE; 228 229 ifmgd = &tx->sdata->u.mgd; 230 231 /* 232 * Don't wakeup from power save if u-apsd is enabled, voip ac has 233 * u-apsd enabled and the frame is in voip class. This effectively 234 * means that even if all access categories have u-apsd enabled, in 235 * practise u-apsd is only used with the voip ac. This is a 236 * workaround for the case when received voip class packets do not 237 * have correct qos tag for some reason, due the network or the 238 * peer application. 239 * 240 * Note: ifmgd->uapsd_queues access is racy here. If the value is 241 * changed via debugfs, user needs to reassociate manually to have 242 * everything in sync. 243 */ 244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 247 return TX_CONTINUE; 248 249 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 250 ieee80211_stop_queues_by_reason(&local->hw, 251 IEEE80211_MAX_QUEUE_MAP, 252 IEEE80211_QUEUE_STOP_REASON_PS, 253 false); 254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 255 wiphy_work_queue(local->hw.wiphy, 256 &local->dynamic_ps_disable_work); 257 } 258 259 /* Don't restart the timer if we're not disassociated */ 260 if (!ifmgd->associated) 261 return TX_CONTINUE; 262 263 mod_timer(&local->dynamic_ps_timer, jiffies + 264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 265 266 return TX_CONTINUE; 267 } 268 269 static ieee80211_tx_result debug_noinline 270 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 271 { 272 273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 275 bool assoc = false; 276 277 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 278 return TX_CONTINUE; 279 280 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 281 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 282 !ieee80211_is_probe_req(hdr->frame_control) && 283 !ieee80211_is_any_nullfunc(hdr->frame_control)) 284 /* 285 * When software scanning only nullfunc frames (to notify 286 * the sleep state to the AP) and probe requests (for the 287 * active scan) are allowed, all other frames should not be 288 * sent and we should not get here, but if we do 289 * nonetheless, drop them to avoid sending them 290 * off-channel. See the link below and 291 * ieee80211_start_scan() for more. 292 * 293 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 294 */ 295 return TX_DROP; 296 297 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 298 return TX_CONTINUE; 299 300 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 301 return TX_CONTINUE; 302 303 if (tx->sta) 304 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 305 306 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 307 if (unlikely(!assoc && 308 ieee80211_is_data(hdr->frame_control))) { 309 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 310 sdata_info(tx->sdata, 311 "dropped data frame to not associated station %pM\n", 312 hdr->addr1); 313 #endif 314 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 315 return TX_DROP; 316 } 317 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 318 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 319 /* 320 * No associated STAs - no need to send multicast 321 * frames. 322 */ 323 return TX_DROP; 324 } 325 326 return TX_CONTINUE; 327 } 328 329 /* This function is called whenever the AP is about to exceed the maximum limit 330 * of buffered frames for power saving STAs. This situation should not really 331 * happen often during normal operation, so dropping the oldest buffered packet 332 * from each queue should be OK to make some room for new frames. */ 333 static void purge_old_ps_buffers(struct ieee80211_local *local) 334 { 335 int total = 0, purged = 0; 336 struct sk_buff *skb; 337 struct ieee80211_sub_if_data *sdata; 338 struct sta_info *sta; 339 340 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 341 struct ps_data *ps; 342 343 if (sdata->vif.type == NL80211_IFTYPE_AP) 344 ps = &sdata->u.ap.ps; 345 else if (ieee80211_vif_is_mesh(&sdata->vif)) 346 ps = &sdata->u.mesh.ps; 347 else 348 continue; 349 350 skb = skb_dequeue(&ps->bc_buf); 351 if (skb) { 352 purged++; 353 ieee80211_free_txskb(&local->hw, skb); 354 } 355 total += skb_queue_len(&ps->bc_buf); 356 } 357 358 /* 359 * Drop one frame from each station from the lowest-priority 360 * AC that has frames at all. 361 */ 362 list_for_each_entry_rcu(sta, &local->sta_list, list) { 363 int ac; 364 365 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 366 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 367 total += skb_queue_len(&sta->ps_tx_buf[ac]); 368 if (skb) { 369 purged++; 370 ieee80211_free_txskb(&local->hw, skb); 371 break; 372 } 373 } 374 } 375 376 local->total_ps_buffered = total; 377 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 378 } 379 380 static ieee80211_tx_result 381 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 382 { 383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 384 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 385 struct ps_data *ps; 386 387 /* 388 * broadcast/multicast frame 389 * 390 * If any of the associated/peer stations is in power save mode, 391 * the frame is buffered to be sent after DTIM beacon frame. 392 * This is done either by the hardware or us. 393 */ 394 395 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 396 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 397 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 398 if (!tx->sdata->bss) 399 return TX_CONTINUE; 400 401 ps = &tx->sdata->bss->ps; 402 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 403 ps = &tx->sdata->u.mesh.ps; 404 } else { 405 return TX_CONTINUE; 406 } 407 408 409 /* no buffering for ordered frames */ 410 if (ieee80211_has_order(hdr->frame_control)) 411 return TX_CONTINUE; 412 413 if (ieee80211_is_probe_req(hdr->frame_control)) 414 return TX_CONTINUE; 415 416 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 417 info->hw_queue = tx->sdata->vif.cab_queue; 418 419 /* no stations in PS mode and no buffered packets */ 420 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 421 return TX_CONTINUE; 422 423 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 424 425 /* device releases frame after DTIM beacon */ 426 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 427 return TX_CONTINUE; 428 429 /* buffered in mac80211 */ 430 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 431 purge_old_ps_buffers(tx->local); 432 433 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 434 ps_dbg(tx->sdata, 435 "BC TX buffer full - dropping the oldest frame\n"); 436 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 437 } else 438 tx->local->total_ps_buffered++; 439 440 skb_queue_tail(&ps->bc_buf, tx->skb); 441 442 return TX_QUEUED; 443 } 444 445 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 446 struct sk_buff *skb) 447 { 448 if (!ieee80211_is_mgmt(fc)) 449 return 0; 450 451 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 452 return 0; 453 454 if (!ieee80211_is_robust_mgmt_frame(skb)) 455 return 0; 456 457 return 1; 458 } 459 460 static ieee80211_tx_result 461 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 462 { 463 struct sta_info *sta = tx->sta; 464 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 465 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 466 struct ieee80211_local *local = tx->local; 467 468 if (unlikely(!sta)) 469 return TX_CONTINUE; 470 471 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 472 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 473 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 474 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 475 int ac = skb_get_queue_mapping(tx->skb); 476 477 if (ieee80211_is_mgmt(hdr->frame_control) && 478 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 479 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 480 return TX_CONTINUE; 481 } 482 483 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 484 sta->sta.addr, sta->sta.aid, ac); 485 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 486 purge_old_ps_buffers(tx->local); 487 488 /* sync with ieee80211_sta_ps_deliver_wakeup */ 489 spin_lock(&sta->ps_lock); 490 /* 491 * STA woke up the meantime and all the frames on ps_tx_buf have 492 * been queued to pending queue. No reordering can happen, go 493 * ahead and Tx the packet. 494 */ 495 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 496 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 497 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 498 spin_unlock(&sta->ps_lock); 499 return TX_CONTINUE; 500 } 501 502 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 503 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 504 ps_dbg(tx->sdata, 505 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 506 sta->sta.addr, ac); 507 ieee80211_free_txskb(&local->hw, old); 508 } else 509 tx->local->total_ps_buffered++; 510 511 info->control.jiffies = jiffies; 512 info->control.vif = &tx->sdata->vif; 513 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 514 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 515 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 516 spin_unlock(&sta->ps_lock); 517 518 if (!timer_pending(&local->sta_cleanup)) 519 mod_timer(&local->sta_cleanup, 520 round_jiffies(jiffies + 521 STA_INFO_CLEANUP_INTERVAL)); 522 523 /* 524 * We queued up some frames, so the TIM bit might 525 * need to be set, recalculate it. 526 */ 527 sta_info_recalc_tim(sta); 528 529 return TX_QUEUED; 530 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 531 ps_dbg(tx->sdata, 532 "STA %pM in PS mode, but polling/in SP -> send frame\n", 533 sta->sta.addr); 534 } 535 536 return TX_CONTINUE; 537 } 538 539 static ieee80211_tx_result debug_noinline 540 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 541 { 542 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 543 return TX_CONTINUE; 544 545 if (tx->flags & IEEE80211_TX_UNICAST) 546 return ieee80211_tx_h_unicast_ps_buf(tx); 547 else 548 return ieee80211_tx_h_multicast_ps_buf(tx); 549 } 550 551 static ieee80211_tx_result debug_noinline 552 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 553 { 554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 555 556 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 557 if (tx->sdata->control_port_no_encrypt) 558 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 559 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 560 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 561 } 562 563 return TX_CONTINUE; 564 } 565 566 static struct ieee80211_key * 567 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 568 { 569 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 570 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 571 struct ieee80211_link_data *link; 572 unsigned int link_id; 573 574 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 575 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 576 link = &tx->sdata->deflink; 577 } else { 578 link = rcu_dereference(tx->sdata->link[link_id]); 579 if (!link) 580 return NULL; 581 } 582 583 if (ieee80211_is_group_privacy_action(tx->skb)) 584 return rcu_dereference(link->default_multicast_key); 585 else if (ieee80211_is_mgmt(hdr->frame_control) && 586 is_multicast_ether_addr(hdr->addr1) && 587 ieee80211_is_robust_mgmt_frame(tx->skb)) 588 return rcu_dereference(link->default_mgmt_key); 589 else if (is_multicast_ether_addr(hdr->addr1)) 590 return rcu_dereference(link->default_multicast_key); 591 592 return NULL; 593 } 594 595 static ieee80211_tx_result debug_noinline 596 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 597 { 598 struct ieee80211_key *key; 599 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 600 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 601 602 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 603 tx->key = NULL; 604 return TX_CONTINUE; 605 } 606 607 if (tx->sta && 608 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 609 tx->key = key; 610 else if ((key = ieee80211_select_link_key(tx))) 611 tx->key = key; 612 else if (!is_multicast_ether_addr(hdr->addr1) && 613 (key = rcu_dereference(tx->sdata->default_unicast_key))) 614 tx->key = key; 615 else 616 tx->key = NULL; 617 618 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 619 if (tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 620 info->control.hw_key = &tx->key->conf; 621 return TX_CONTINUE; 622 } 623 624 if (tx->key) { 625 bool skip_hw = false; 626 627 /* TODO: add threshold stuff again */ 628 629 switch (tx->key->conf.cipher) { 630 case WLAN_CIPHER_SUITE_WEP40: 631 case WLAN_CIPHER_SUITE_WEP104: 632 case WLAN_CIPHER_SUITE_TKIP: 633 if (!ieee80211_is_data_present(hdr->frame_control)) 634 tx->key = NULL; 635 break; 636 case WLAN_CIPHER_SUITE_CCMP: 637 case WLAN_CIPHER_SUITE_CCMP_256: 638 case WLAN_CIPHER_SUITE_GCMP: 639 case WLAN_CIPHER_SUITE_GCMP_256: 640 if (!ieee80211_is_data_present(hdr->frame_control) && 641 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 642 tx->skb) && 643 !ieee80211_is_group_privacy_action(tx->skb)) 644 tx->key = NULL; 645 else 646 skip_hw = (tx->key->conf.flags & 647 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 648 ieee80211_is_mgmt(hdr->frame_control); 649 break; 650 case WLAN_CIPHER_SUITE_AES_CMAC: 651 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 652 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 653 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 654 if (!ieee80211_is_mgmt(hdr->frame_control)) 655 tx->key = NULL; 656 break; 657 } 658 659 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 660 !ieee80211_is_deauth(hdr->frame_control)) && 661 tx->skb->protocol != tx->sdata->control_port_protocol) 662 return TX_DROP; 663 664 if (!skip_hw && tx->key && 665 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 666 info->control.hw_key = &tx->key->conf; 667 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 668 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 669 return TX_DROP; 670 } 671 672 return TX_CONTINUE; 673 } 674 675 static ieee80211_tx_result debug_noinline 676 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 677 { 678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 679 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 680 struct ieee80211_supported_band *sband; 681 u32 len; 682 struct ieee80211_tx_rate_control txrc; 683 struct ieee80211_sta_rates *ratetbl = NULL; 684 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 685 bool assoc = false; 686 687 memset(&txrc, 0, sizeof(txrc)); 688 689 if (info->band < NUM_NL80211_BANDS) 690 sband = tx->local->hw.wiphy->bands[info->band]; 691 else 692 return TX_CONTINUE; 693 694 len = min_t(u32, tx->skb->len + FCS_LEN, 695 tx->local->hw.wiphy->frag_threshold); 696 697 /* set up the tx rate control struct we give the RC algo */ 698 txrc.hw = &tx->local->hw; 699 txrc.sband = sband; 700 txrc.bss_conf = &tx->sdata->vif.bss_conf; 701 txrc.skb = tx->skb; 702 txrc.reported_rate.idx = -1; 703 704 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 705 txrc.rate_idx_mask = ~0; 706 } else { 707 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 708 709 if (tx->sdata->rc_has_mcs_mask[info->band]) 710 txrc.rate_idx_mcs_mask = 711 tx->sdata->rc_rateidx_mcs_mask[info->band]; 712 } 713 714 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 715 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 716 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 717 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 718 719 /* set up RTS protection if desired */ 720 if (len > tx->local->hw.wiphy->rts_threshold) { 721 txrc.rts = true; 722 } 723 724 info->control.use_rts = txrc.rts; 725 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 726 727 /* 728 * Use short preamble if the BSS can handle it, but not for 729 * management frames unless we know the receiver can handle 730 * that -- the management frame might be to a station that 731 * just wants a probe response. 732 */ 733 if (tx->sdata->vif.bss_conf.use_short_preamble && 734 (ieee80211_is_tx_data(tx->skb) || 735 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 736 txrc.short_preamble = true; 737 738 info->control.short_preamble = txrc.short_preamble; 739 740 /* don't ask rate control when rate already injected via radiotap */ 741 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 742 return TX_CONTINUE; 743 744 if (tx->sta) 745 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 746 747 /* 748 * Lets not bother rate control if we're associated and cannot 749 * talk to the sta. This should not happen. 750 */ 751 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 752 !rate_usable_index_exists(sband, &tx->sta->sta), 753 "%s: Dropped data frame as no usable bitrate found while " 754 "scanning and associated. Target station: " 755 "%pM on %d GHz band\n", 756 tx->sdata->name, 757 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 758 info->band ? 5 : 2)) 759 return TX_DROP; 760 761 /* 762 * If we're associated with the sta at this point we know we can at 763 * least send the frame at the lowest bit rate. 764 */ 765 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 766 767 if (tx->sta && !info->control.skip_table) 768 ratetbl = rcu_dereference(tx->sta->sta.rates); 769 770 if (unlikely(info->control.rates[0].idx < 0)) { 771 if (ratetbl) { 772 struct ieee80211_tx_rate rate = { 773 .idx = ratetbl->rate[0].idx, 774 .flags = ratetbl->rate[0].flags, 775 .count = ratetbl->rate[0].count 776 }; 777 778 if (ratetbl->rate[0].idx < 0) 779 return TX_DROP; 780 781 tx->rate = rate; 782 } else { 783 return TX_DROP; 784 } 785 } else { 786 tx->rate = info->control.rates[0]; 787 } 788 789 if (txrc.reported_rate.idx < 0) { 790 txrc.reported_rate = tx->rate; 791 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 792 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 793 } else if (tx->sta) 794 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 795 796 if (ratetbl) 797 return TX_CONTINUE; 798 799 if (unlikely(!info->control.rates[0].count)) 800 info->control.rates[0].count = 1; 801 802 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 803 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 804 info->control.rates[0].count = 1; 805 806 return TX_CONTINUE; 807 } 808 809 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 810 { 811 u16 *seq = &sta->tid_seq[tid]; 812 __le16 ret = cpu_to_le16(*seq); 813 814 /* Increase the sequence number. */ 815 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 816 817 return ret; 818 } 819 820 static ieee80211_tx_result debug_noinline 821 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 822 { 823 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 825 int tid; 826 827 /* 828 * Packet injection may want to control the sequence 829 * number, if we have no matching interface then we 830 * neither assign one ourselves nor ask the driver to. 831 */ 832 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 833 return TX_CONTINUE; 834 835 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 836 return TX_CONTINUE; 837 838 if (ieee80211_hdrlen(hdr->frame_control) < 24) 839 return TX_CONTINUE; 840 841 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 842 return TX_CONTINUE; 843 844 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 845 return TX_CONTINUE; 846 847 /* SNS11 from 802.11be 10.3.2.14 */ 848 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 849 ieee80211_vif_is_mld(info->control.vif) && 850 info->control.vif->type == NL80211_IFTYPE_AP)) { 851 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 852 tx->sdata->mld_mcast_seq += 0x10; 853 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 854 return TX_CONTINUE; 855 } 856 857 /* 858 * Anything but QoS data that has a sequence number field 859 * (is long enough) gets a sequence number from the global 860 * counter. QoS data frames with a multicast destination 861 * also use the global counter (802.11-2012 9.3.2.10). 862 */ 863 if (!ieee80211_is_data_qos(hdr->frame_control) || 864 is_multicast_ether_addr(hdr->addr1)) { 865 /* driver should assign sequence number */ 866 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 867 /* for pure STA mode without beacons, we can do it */ 868 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 869 tx->sdata->sequence_number += 0x10; 870 if (tx->sta) 871 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 872 return TX_CONTINUE; 873 } 874 875 /* 876 * This should be true for injected/management frames only, for 877 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 878 * above since they are not QoS-data frames. 879 */ 880 if (!tx->sta) 881 return TX_CONTINUE; 882 883 /* include per-STA, per-TID sequence counter */ 884 tid = ieee80211_get_tid(hdr); 885 tx->sta->deflink.tx_stats.msdu[tid]++; 886 887 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 888 889 return TX_CONTINUE; 890 } 891 892 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 893 struct sk_buff *skb, int hdrlen, 894 int frag_threshold) 895 { 896 struct ieee80211_local *local = tx->local; 897 struct ieee80211_tx_info *info; 898 struct sk_buff *tmp; 899 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 900 int pos = hdrlen + per_fragm; 901 int rem = skb->len - hdrlen - per_fragm; 902 903 if (WARN_ON(rem < 0)) 904 return -EINVAL; 905 906 /* first fragment was already added to queue by caller */ 907 908 while (rem) { 909 int fraglen = per_fragm; 910 911 if (fraglen > rem) 912 fraglen = rem; 913 rem -= fraglen; 914 tmp = dev_alloc_skb(local->tx_headroom + 915 frag_threshold + 916 IEEE80211_ENCRYPT_HEADROOM + 917 IEEE80211_ENCRYPT_TAILROOM); 918 if (!tmp) 919 return -ENOMEM; 920 921 __skb_queue_tail(&tx->skbs, tmp); 922 923 skb_reserve(tmp, 924 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 925 926 /* copy control information */ 927 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 928 929 info = IEEE80211_SKB_CB(tmp); 930 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 931 IEEE80211_TX_CTL_FIRST_FRAGMENT); 932 933 if (rem) 934 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 935 936 skb_copy_queue_mapping(tmp, skb); 937 tmp->priority = skb->priority; 938 tmp->dev = skb->dev; 939 940 /* copy header and data */ 941 skb_put_data(tmp, skb->data, hdrlen); 942 skb_put_data(tmp, skb->data + pos, fraglen); 943 944 pos += fraglen; 945 } 946 947 /* adjust first fragment's length */ 948 skb_trim(skb, hdrlen + per_fragm); 949 return 0; 950 } 951 952 static ieee80211_tx_result debug_noinline 953 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 954 { 955 struct sk_buff *skb = tx->skb; 956 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 957 struct ieee80211_hdr *hdr = (void *)skb->data; 958 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 959 int hdrlen; 960 int fragnum; 961 962 /* no matter what happens, tx->skb moves to tx->skbs */ 963 __skb_queue_tail(&tx->skbs, skb); 964 tx->skb = NULL; 965 966 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 967 return TX_CONTINUE; 968 969 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 970 return TX_CONTINUE; 971 972 /* 973 * Warn when submitting a fragmented A-MPDU frame and drop it. 974 * This scenario is handled in ieee80211_tx_prepare but extra 975 * caution taken here as fragmented ampdu may cause Tx stop. 976 */ 977 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 978 return TX_DROP; 979 980 hdrlen = ieee80211_hdrlen(hdr->frame_control); 981 982 /* internal error, why isn't DONTFRAG set? */ 983 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 984 return TX_DROP; 985 986 /* 987 * Now fragment the frame. This will allocate all the fragments and 988 * chain them (using skb as the first fragment) to skb->next. 989 * During transmission, we will remove the successfully transmitted 990 * fragments from this list. When the low-level driver rejects one 991 * of the fragments then we will simply pretend to accept the skb 992 * but store it away as pending. 993 */ 994 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 995 return TX_DROP; 996 997 /* update duration/seq/flags of fragments */ 998 fragnum = 0; 999 1000 skb_queue_walk(&tx->skbs, skb) { 1001 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1002 1003 hdr = (void *)skb->data; 1004 info = IEEE80211_SKB_CB(skb); 1005 1006 if (!skb_queue_is_last(&tx->skbs, skb)) { 1007 hdr->frame_control |= morefrags; 1008 /* 1009 * No multi-rate retries for fragmented frames, that 1010 * would completely throw off the NAV at other STAs. 1011 */ 1012 info->control.rates[1].idx = -1; 1013 info->control.rates[2].idx = -1; 1014 info->control.rates[3].idx = -1; 1015 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1016 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1017 } else { 1018 hdr->frame_control &= ~morefrags; 1019 } 1020 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1021 fragnum++; 1022 } 1023 1024 return TX_CONTINUE; 1025 } 1026 1027 static ieee80211_tx_result debug_noinline 1028 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1029 { 1030 struct sk_buff *skb; 1031 int ac = -1; 1032 1033 if (!tx->sta) 1034 return TX_CONTINUE; 1035 1036 skb_queue_walk(&tx->skbs, skb) { 1037 ac = skb_get_queue_mapping(skb); 1038 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1039 } 1040 if (ac >= 0) 1041 tx->sta->deflink.tx_stats.packets[ac]++; 1042 1043 return TX_CONTINUE; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1048 { 1049 if (!tx->key) 1050 return TX_CONTINUE; 1051 1052 switch (tx->key->conf.cipher) { 1053 case WLAN_CIPHER_SUITE_WEP40: 1054 case WLAN_CIPHER_SUITE_WEP104: 1055 return ieee80211_crypto_wep_encrypt(tx); 1056 case WLAN_CIPHER_SUITE_TKIP: 1057 return ieee80211_crypto_tkip_encrypt(tx); 1058 case WLAN_CIPHER_SUITE_CCMP: 1059 return ieee80211_crypto_ccmp_encrypt( 1060 tx, IEEE80211_CCMP_MIC_LEN); 1061 case WLAN_CIPHER_SUITE_CCMP_256: 1062 return ieee80211_crypto_ccmp_encrypt( 1063 tx, IEEE80211_CCMP_256_MIC_LEN); 1064 case WLAN_CIPHER_SUITE_AES_CMAC: 1065 return ieee80211_crypto_aes_cmac_encrypt( 1066 tx, IEEE80211_CMAC_128_MIC_LEN); 1067 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1068 return ieee80211_crypto_aes_cmac_encrypt( 1069 tx, IEEE80211_CMAC_256_MIC_LEN); 1070 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1071 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1072 return ieee80211_crypto_aes_gmac_encrypt(tx); 1073 case WLAN_CIPHER_SUITE_GCMP: 1074 case WLAN_CIPHER_SUITE_GCMP_256: 1075 return ieee80211_crypto_gcmp_encrypt(tx); 1076 } 1077 1078 return TX_DROP; 1079 } 1080 1081 static ieee80211_tx_result debug_noinline 1082 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1083 { 1084 struct sk_buff *skb; 1085 struct ieee80211_hdr *hdr; 1086 int next_len; 1087 bool group_addr; 1088 1089 skb_queue_walk(&tx->skbs, skb) { 1090 hdr = (void *) skb->data; 1091 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1092 break; /* must not overwrite AID */ 1093 if (!skb_queue_is_last(&tx->skbs, skb)) { 1094 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1095 next_len = next->len; 1096 } else 1097 next_len = 0; 1098 group_addr = is_multicast_ether_addr(hdr->addr1); 1099 1100 hdr->duration_id = 1101 ieee80211_duration(tx, skb, group_addr, next_len); 1102 } 1103 1104 return TX_CONTINUE; 1105 } 1106 1107 /* actual transmit path */ 1108 1109 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1110 struct sk_buff *skb, 1111 struct ieee80211_tx_info *info, 1112 struct tid_ampdu_tx *tid_tx, 1113 int tid) 1114 { 1115 bool queued = false; 1116 bool reset_agg_timer = false; 1117 struct sk_buff *purge_skb = NULL; 1118 1119 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1120 reset_agg_timer = true; 1121 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1122 /* 1123 * nothing -- this aggregation session is being started 1124 * but that might still fail with the driver 1125 */ 1126 } else if (!tx->sta->sta.txq[tid]) { 1127 spin_lock(&tx->sta->lock); 1128 /* 1129 * Need to re-check now, because we may get here 1130 * 1131 * 1) in the window during which the setup is actually 1132 * already done, but not marked yet because not all 1133 * packets are spliced over to the driver pending 1134 * queue yet -- if this happened we acquire the lock 1135 * either before or after the splice happens, but 1136 * need to recheck which of these cases happened. 1137 * 1138 * 2) during session teardown, if the OPERATIONAL bit 1139 * was cleared due to the teardown but the pointer 1140 * hasn't been assigned NULL yet (or we loaded it 1141 * before it was assigned) -- in this case it may 1142 * now be NULL which means we should just let the 1143 * packet pass through because splicing the frames 1144 * back is already done. 1145 */ 1146 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1147 1148 if (!tid_tx) { 1149 /* do nothing, let packet pass through */ 1150 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1151 reset_agg_timer = true; 1152 } else { 1153 queued = true; 1154 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1155 clear_sta_flag(tx->sta, WLAN_STA_SP); 1156 ps_dbg(tx->sta->sdata, 1157 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1158 tx->sta->sta.addr, tx->sta->sta.aid); 1159 } 1160 info->control.vif = &tx->sdata->vif; 1161 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1162 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1163 __skb_queue_tail(&tid_tx->pending, skb); 1164 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1165 purge_skb = __skb_dequeue(&tid_tx->pending); 1166 } 1167 spin_unlock(&tx->sta->lock); 1168 1169 if (purge_skb) 1170 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1171 } 1172 1173 /* reset session timer */ 1174 if (reset_agg_timer) 1175 tid_tx->last_tx = jiffies; 1176 1177 return queued; 1178 } 1179 1180 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1181 struct sta_info *sta, struct sk_buff *skb) 1182 { 1183 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1184 u16 tid; 1185 1186 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1187 return; 1188 1189 if (!sta || 1190 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1191 !sta->sta.deflink.s1g_cap.s1g) || 1192 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1193 skb->protocol == sdata->control_port_protocol) 1194 return; 1195 1196 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1197 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1198 return; 1199 1200 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1201 } 1202 1203 /* 1204 * initialises @tx 1205 * pass %NULL for the station if unknown, a valid pointer if known 1206 * or an ERR_PTR() if the station is known not to exist 1207 */ 1208 static ieee80211_tx_result 1209 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1210 struct ieee80211_tx_data *tx, 1211 struct sta_info *sta, struct sk_buff *skb) 1212 { 1213 struct ieee80211_local *local = sdata->local; 1214 struct ieee80211_hdr *hdr; 1215 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1216 bool aggr_check = false; 1217 int tid; 1218 1219 memset(tx, 0, sizeof(*tx)); 1220 tx->skb = skb; 1221 tx->local = local; 1222 tx->sdata = sdata; 1223 __skb_queue_head_init(&tx->skbs); 1224 1225 /* 1226 * If this flag is set to true anywhere, and we get here, 1227 * we are doing the needed processing, so remove the flag 1228 * now. 1229 */ 1230 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1231 1232 hdr = (struct ieee80211_hdr *) skb->data; 1233 1234 if (likely(sta)) { 1235 if (!IS_ERR(sta)) 1236 tx->sta = sta; 1237 } else { 1238 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1239 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1240 if (!tx->sta && sdata->wdev.use_4addr) 1241 return TX_DROP; 1242 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1243 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1244 } 1245 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1246 tx->sta = sta_info_get(sdata, hdr->addr1); 1247 aggr_check = true; 1248 } 1249 } 1250 1251 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1252 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1253 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1254 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1255 struct tid_ampdu_tx *tid_tx; 1256 1257 tid = ieee80211_get_tid(hdr); 1258 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1259 if (!tid_tx && aggr_check) { 1260 ieee80211_aggr_check(sdata, tx->sta, skb); 1261 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1262 } 1263 1264 if (tid_tx) { 1265 bool queued; 1266 1267 queued = ieee80211_tx_prep_agg(tx, skb, info, 1268 tid_tx, tid); 1269 1270 if (unlikely(queued)) 1271 return TX_QUEUED; 1272 } 1273 } 1274 1275 if (is_multicast_ether_addr(hdr->addr1)) { 1276 tx->flags &= ~IEEE80211_TX_UNICAST; 1277 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1278 } else 1279 tx->flags |= IEEE80211_TX_UNICAST; 1280 1281 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1282 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1283 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1284 info->flags & IEEE80211_TX_CTL_AMPDU) 1285 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1286 } 1287 1288 if (!tx->sta) 1289 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1290 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1291 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1292 ieee80211_check_fast_xmit(tx->sta); 1293 } 1294 1295 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1296 1297 return TX_CONTINUE; 1298 } 1299 1300 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1301 struct ieee80211_vif *vif, 1302 struct sta_info *sta, 1303 struct sk_buff *skb) 1304 { 1305 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1306 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1307 struct ieee80211_txq *txq = NULL; 1308 1309 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1310 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1311 return NULL; 1312 1313 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1314 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1315 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1316 ieee80211_is_bufferable_mmpdu(skb) || 1317 vif->type == NL80211_IFTYPE_STATION) && 1318 sta && sta->uploaded) { 1319 /* 1320 * This will be NULL if the driver didn't set the 1321 * opt-in hardware flag. 1322 */ 1323 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1324 } 1325 } else if (sta) { 1326 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1327 1328 if (!sta->uploaded) 1329 return NULL; 1330 1331 txq = sta->sta.txq[tid]; 1332 } else { 1333 txq = vif->txq; 1334 } 1335 1336 if (!txq) 1337 return NULL; 1338 1339 return to_txq_info(txq); 1340 } 1341 1342 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1343 { 1344 struct sk_buff *next; 1345 codel_time_t now = codel_get_time(); 1346 1347 skb_list_walk_safe(skb, skb, next) 1348 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1349 } 1350 1351 static u32 codel_skb_len_func(const struct sk_buff *skb) 1352 { 1353 return skb->len; 1354 } 1355 1356 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1357 { 1358 const struct ieee80211_tx_info *info; 1359 1360 info = (const struct ieee80211_tx_info *)skb->cb; 1361 return info->control.enqueue_time; 1362 } 1363 1364 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1365 void *ctx) 1366 { 1367 struct ieee80211_local *local; 1368 struct txq_info *txqi; 1369 struct fq *fq; 1370 struct fq_flow *flow; 1371 1372 txqi = ctx; 1373 local = vif_to_sdata(txqi->txq.vif)->local; 1374 fq = &local->fq; 1375 1376 if (cvars == &txqi->def_cvars) 1377 flow = &txqi->tin.default_flow; 1378 else 1379 flow = &fq->flows[cvars - local->cvars]; 1380 1381 return fq_flow_dequeue(fq, flow); 1382 } 1383 1384 static void codel_drop_func(struct sk_buff *skb, 1385 void *ctx) 1386 { 1387 struct ieee80211_local *local; 1388 struct ieee80211_hw *hw; 1389 struct txq_info *txqi; 1390 1391 txqi = ctx; 1392 local = vif_to_sdata(txqi->txq.vif)->local; 1393 hw = &local->hw; 1394 1395 ieee80211_free_txskb(hw, skb); 1396 } 1397 1398 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1399 struct fq_tin *tin, 1400 struct fq_flow *flow) 1401 { 1402 struct ieee80211_local *local; 1403 struct txq_info *txqi; 1404 struct codel_vars *cvars; 1405 struct codel_params *cparams; 1406 struct codel_stats *cstats; 1407 1408 local = container_of(fq, struct ieee80211_local, fq); 1409 txqi = container_of(tin, struct txq_info, tin); 1410 cparams = &local->cparams; 1411 cstats = &txqi->cstats; 1412 1413 if (flow == &tin->default_flow) 1414 cvars = &txqi->def_cvars; 1415 else 1416 cvars = &local->cvars[flow - fq->flows]; 1417 1418 return codel_dequeue(txqi, 1419 &flow->backlog, 1420 cparams, 1421 cvars, 1422 cstats, 1423 codel_skb_len_func, 1424 codel_skb_time_func, 1425 codel_drop_func, 1426 codel_dequeue_func); 1427 } 1428 1429 static void fq_skb_free_func(struct fq *fq, 1430 struct fq_tin *tin, 1431 struct fq_flow *flow, 1432 struct sk_buff *skb) 1433 { 1434 struct ieee80211_local *local; 1435 1436 local = container_of(fq, struct ieee80211_local, fq); 1437 ieee80211_free_txskb(&local->hw, skb); 1438 } 1439 1440 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1441 struct txq_info *txqi, 1442 struct sk_buff *skb) 1443 { 1444 struct fq *fq = &local->fq; 1445 struct fq_tin *tin = &txqi->tin; 1446 u32 flow_idx; 1447 1448 ieee80211_set_skb_enqueue_time(skb); 1449 1450 spin_lock_bh(&fq->lock); 1451 /* 1452 * For management frames, don't really apply codel etc., 1453 * we don't want to apply any shaping or anything we just 1454 * want to simplify the driver API by having them on the 1455 * txqi. 1456 */ 1457 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1458 IEEE80211_SKB_CB(skb)->control.flags |= 1459 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1460 __skb_queue_tail(&txqi->frags, skb); 1461 } else { 1462 flow_idx = fq_flow_idx(fq, skb); 1463 fq_tin_enqueue(fq, tin, flow_idx, skb, 1464 fq_skb_free_func); 1465 } 1466 spin_unlock_bh(&fq->lock); 1467 } 1468 1469 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1470 struct fq_flow *flow, struct sk_buff *skb, 1471 void *data) 1472 { 1473 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1474 1475 return info->control.vif == data; 1476 } 1477 1478 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1479 struct ieee80211_sub_if_data *sdata) 1480 { 1481 struct fq *fq = &local->fq; 1482 struct txq_info *txqi; 1483 struct fq_tin *tin; 1484 struct ieee80211_sub_if_data *ap; 1485 1486 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1487 return; 1488 1489 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1490 1491 if (!ap->vif.txq) 1492 return; 1493 1494 txqi = to_txq_info(ap->vif.txq); 1495 tin = &txqi->tin; 1496 1497 spin_lock_bh(&fq->lock); 1498 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1499 fq_skb_free_func); 1500 spin_unlock_bh(&fq->lock); 1501 } 1502 1503 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1504 struct sta_info *sta, 1505 struct txq_info *txqi, int tid) 1506 { 1507 fq_tin_init(&txqi->tin); 1508 codel_vars_init(&txqi->def_cvars); 1509 codel_stats_init(&txqi->cstats); 1510 __skb_queue_head_init(&txqi->frags); 1511 INIT_LIST_HEAD(&txqi->schedule_order); 1512 1513 txqi->txq.vif = &sdata->vif; 1514 1515 if (!sta) { 1516 sdata->vif.txq = &txqi->txq; 1517 txqi->txq.tid = 0; 1518 txqi->txq.ac = IEEE80211_AC_BE; 1519 1520 return; 1521 } 1522 1523 if (tid == IEEE80211_NUM_TIDS) { 1524 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1525 /* Drivers need to opt in to the management MPDU TXQ */ 1526 if (!ieee80211_hw_check(&sdata->local->hw, 1527 STA_MMPDU_TXQ)) 1528 return; 1529 } else if (!ieee80211_hw_check(&sdata->local->hw, 1530 BUFF_MMPDU_TXQ)) { 1531 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1532 return; 1533 } 1534 txqi->txq.ac = IEEE80211_AC_VO; 1535 } else { 1536 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1537 } 1538 1539 txqi->txq.sta = &sta->sta; 1540 txqi->txq.tid = tid; 1541 sta->sta.txq[tid] = &txqi->txq; 1542 } 1543 1544 void ieee80211_txq_purge(struct ieee80211_local *local, 1545 struct txq_info *txqi) 1546 { 1547 struct fq *fq = &local->fq; 1548 struct fq_tin *tin = &txqi->tin; 1549 1550 spin_lock_bh(&fq->lock); 1551 fq_tin_reset(fq, tin, fq_skb_free_func); 1552 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1553 spin_unlock_bh(&fq->lock); 1554 1555 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1556 list_del_init(&txqi->schedule_order); 1557 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1558 } 1559 1560 void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx) 1561 { 1562 if (local->hw.wiphy->txq_limit) 1563 local->fq.limit = local->hw.wiphy->txq_limit; 1564 else 1565 local->hw.wiphy->txq_limit = local->fq.limit; 1566 1567 if (local->hw.wiphy->txq_memory_limit) 1568 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1569 else 1570 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1571 1572 if (local->hw.wiphy->txq_quantum) 1573 local->fq.quantum = local->hw.wiphy->txq_quantum; 1574 else 1575 local->hw.wiphy->txq_quantum = local->fq.quantum; 1576 } 1577 1578 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1579 { 1580 struct fq *fq = &local->fq; 1581 int ret; 1582 int i; 1583 bool supp_vht = false; 1584 enum nl80211_band band; 1585 1586 ret = fq_init(fq, 4096); 1587 if (ret) 1588 return ret; 1589 1590 /* 1591 * If the hardware doesn't support VHT, it is safe to limit the maximum 1592 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1593 */ 1594 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1595 struct ieee80211_supported_band *sband; 1596 1597 sband = local->hw.wiphy->bands[band]; 1598 if (!sband) 1599 continue; 1600 1601 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1602 } 1603 1604 if (!supp_vht) 1605 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1606 1607 codel_params_init(&local->cparams); 1608 local->cparams.interval = MS2TIME(100); 1609 local->cparams.target = MS2TIME(20); 1610 local->cparams.ecn = true; 1611 1612 local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1613 GFP_KERNEL); 1614 if (!local->cvars) { 1615 spin_lock_bh(&fq->lock); 1616 fq_reset(fq, fq_skb_free_func); 1617 spin_unlock_bh(&fq->lock); 1618 return -ENOMEM; 1619 } 1620 1621 for (i = 0; i < fq->flows_cnt; i++) 1622 codel_vars_init(&local->cvars[i]); 1623 1624 ieee80211_txq_set_params(local, -1); 1625 1626 return 0; 1627 } 1628 1629 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1630 { 1631 struct fq *fq = &local->fq; 1632 1633 kvfree(local->cvars); 1634 local->cvars = NULL; 1635 1636 spin_lock_bh(&fq->lock); 1637 fq_reset(fq, fq_skb_free_func); 1638 spin_unlock_bh(&fq->lock); 1639 } 1640 1641 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1642 struct ieee80211_sub_if_data *sdata, 1643 struct sta_info *sta, 1644 struct sk_buff *skb) 1645 { 1646 struct ieee80211_vif *vif; 1647 struct txq_info *txqi; 1648 1649 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1650 return false; 1651 1652 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1653 sdata = container_of(sdata->bss, 1654 struct ieee80211_sub_if_data, u.ap); 1655 1656 vif = &sdata->vif; 1657 txqi = ieee80211_get_txq(local, vif, sta, skb); 1658 1659 if (!txqi) 1660 return false; 1661 1662 ieee80211_txq_enqueue(local, txqi, skb); 1663 1664 schedule_and_wake_txq(local, txqi); 1665 1666 return true; 1667 } 1668 1669 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1670 struct ieee80211_vif *vif, 1671 struct sta_info *sta, 1672 struct sk_buff_head *skbs, 1673 bool txpending) 1674 { 1675 struct ieee80211_tx_control control = {}; 1676 struct sk_buff *skb, *tmp; 1677 unsigned long flags; 1678 1679 skb_queue_walk_safe(skbs, skb, tmp) { 1680 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1681 int q = info->hw_queue; 1682 1683 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1684 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1685 __skb_unlink(skb, skbs); 1686 ieee80211_free_txskb(&local->hw, skb); 1687 continue; 1688 } 1689 #endif 1690 1691 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1692 if (local->queue_stop_reasons[q] || 1693 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1694 if (unlikely(info->flags & 1695 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1696 if (local->queue_stop_reasons[q] & 1697 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1698 /* 1699 * Drop off-channel frames if queues 1700 * are stopped for any reason other 1701 * than off-channel operation. Never 1702 * queue them. 1703 */ 1704 spin_unlock_irqrestore( 1705 &local->queue_stop_reason_lock, 1706 flags); 1707 ieee80211_purge_tx_queue(&local->hw, 1708 skbs); 1709 return true; 1710 } 1711 } else { 1712 1713 /* 1714 * Since queue is stopped, queue up frames for 1715 * later transmission from the tx-pending 1716 * tasklet when the queue is woken again. 1717 */ 1718 if (txpending) 1719 skb_queue_splice_init(skbs, 1720 &local->pending[q]); 1721 else 1722 skb_queue_splice_tail_init(skbs, 1723 &local->pending[q]); 1724 1725 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1726 flags); 1727 return false; 1728 } 1729 } 1730 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1731 1732 info->control.vif = vif; 1733 control.sta = sta ? &sta->sta : NULL; 1734 1735 __skb_unlink(skb, skbs); 1736 drv_tx(local, &control, skb); 1737 } 1738 1739 return true; 1740 } 1741 1742 /* 1743 * Returns false if the frame couldn't be transmitted but was queued instead. 1744 */ 1745 static bool __ieee80211_tx(struct ieee80211_local *local, 1746 struct sk_buff_head *skbs, struct sta_info *sta, 1747 bool txpending) 1748 { 1749 struct ieee80211_tx_info *info; 1750 struct ieee80211_sub_if_data *sdata; 1751 struct ieee80211_vif *vif; 1752 struct sk_buff *skb; 1753 bool result; 1754 1755 if (WARN_ON(skb_queue_empty(skbs))) 1756 return true; 1757 1758 skb = skb_peek(skbs); 1759 info = IEEE80211_SKB_CB(skb); 1760 sdata = vif_to_sdata(info->control.vif); 1761 if (sta && !sta->uploaded) 1762 sta = NULL; 1763 1764 switch (sdata->vif.type) { 1765 case NL80211_IFTYPE_MONITOR: 1766 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1767 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1768 vif = &sdata->vif; 1769 break; 1770 } 1771 sdata = rcu_dereference(local->monitor_sdata); 1772 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1773 vif = &sdata->vif; 1774 info->hw_queue = 1775 vif->hw_queue[skb_get_queue_mapping(skb)]; 1776 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1777 ieee80211_purge_tx_queue(&local->hw, skbs); 1778 return true; 1779 } else 1780 vif = NULL; 1781 break; 1782 case NL80211_IFTYPE_AP_VLAN: 1783 sdata = container_of(sdata->bss, 1784 struct ieee80211_sub_if_data, u.ap); 1785 fallthrough; 1786 default: 1787 vif = &sdata->vif; 1788 break; 1789 } 1790 1791 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1792 1793 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1794 1795 return result; 1796 } 1797 1798 /* 1799 * Invoke TX handlers, return 0 on success and non-zero if the 1800 * frame was dropped or queued. 1801 * 1802 * The handlers are split into an early and late part. The latter is everything 1803 * that can be sensitive to reordering, and will be deferred to after packets 1804 * are dequeued from the intermediate queues (when they are enabled). 1805 */ 1806 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1807 { 1808 ieee80211_tx_result res = TX_DROP; 1809 1810 #define CALL_TXH(txh) \ 1811 do { \ 1812 res = txh(tx); \ 1813 if (res != TX_CONTINUE) \ 1814 goto txh_done; \ 1815 } while (0) 1816 1817 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1818 CALL_TXH(ieee80211_tx_h_check_assoc); 1819 CALL_TXH(ieee80211_tx_h_ps_buf); 1820 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1821 CALL_TXH(ieee80211_tx_h_select_key); 1822 1823 txh_done: 1824 if (unlikely(res == TX_DROP)) { 1825 tx->sdata->tx_handlers_drop++; 1826 if (tx->skb) 1827 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1828 else 1829 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1830 return -1; 1831 } else if (unlikely(res == TX_QUEUED)) { 1832 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1833 return -1; 1834 } 1835 1836 return 0; 1837 } 1838 1839 /* 1840 * Late handlers can be called while the sta lock is held. Handlers that can 1841 * cause packets to be generated will cause deadlock! 1842 */ 1843 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1844 { 1845 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1846 ieee80211_tx_result res = TX_CONTINUE; 1847 1848 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1849 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1850 1851 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1852 __skb_queue_tail(&tx->skbs, tx->skb); 1853 tx->skb = NULL; 1854 goto txh_done; 1855 } 1856 1857 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1858 CALL_TXH(ieee80211_tx_h_sequence); 1859 CALL_TXH(ieee80211_tx_h_fragment); 1860 /* handlers after fragment must be aware of tx info fragmentation! */ 1861 CALL_TXH(ieee80211_tx_h_stats); 1862 CALL_TXH(ieee80211_tx_h_encrypt); 1863 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1864 CALL_TXH(ieee80211_tx_h_calculate_duration); 1865 #undef CALL_TXH 1866 1867 txh_done: 1868 if (unlikely(res == TX_DROP)) { 1869 tx->sdata->tx_handlers_drop++; 1870 if (tx->skb) 1871 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1872 else 1873 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1874 return -1; 1875 } else if (unlikely(res == TX_QUEUED)) { 1876 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1877 return -1; 1878 } 1879 1880 return 0; 1881 } 1882 1883 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1884 { 1885 int r = invoke_tx_handlers_early(tx); 1886 1887 if (r) 1888 return r; 1889 return invoke_tx_handlers_late(tx); 1890 } 1891 1892 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1893 struct ieee80211_vif *vif, struct sk_buff *skb, 1894 int band, struct ieee80211_sta **sta) 1895 { 1896 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1897 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1898 struct ieee80211_tx_data tx; 1899 struct sk_buff *skb2; 1900 1901 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1902 return false; 1903 1904 info->band = band; 1905 info->control.vif = vif; 1906 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1907 1908 if (invoke_tx_handlers(&tx)) 1909 return false; 1910 1911 if (sta) { 1912 if (tx.sta) 1913 *sta = &tx.sta->sta; 1914 else 1915 *sta = NULL; 1916 } 1917 1918 /* this function isn't suitable for fragmented data frames */ 1919 skb2 = __skb_dequeue(&tx.skbs); 1920 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1921 ieee80211_free_txskb(hw, skb2); 1922 ieee80211_purge_tx_queue(hw, &tx.skbs); 1923 return false; 1924 } 1925 1926 return true; 1927 } 1928 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1929 1930 /* 1931 * Returns false if the frame couldn't be transmitted but was queued instead. 1932 */ 1933 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1934 struct sta_info *sta, struct sk_buff *skb, 1935 bool txpending) 1936 { 1937 struct ieee80211_local *local = sdata->local; 1938 struct ieee80211_tx_data tx; 1939 ieee80211_tx_result res_prepare; 1940 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1941 bool result = true; 1942 1943 if (unlikely(skb->len < 10)) { 1944 dev_kfree_skb(skb); 1945 return true; 1946 } 1947 1948 /* initialises tx */ 1949 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1950 1951 if (unlikely(res_prepare == TX_DROP)) { 1952 ieee80211_free_txskb(&local->hw, skb); 1953 tx.sdata->tx_handlers_drop++; 1954 return true; 1955 } else if (unlikely(res_prepare == TX_QUEUED)) { 1956 return true; 1957 } 1958 1959 /* set up hw_queue value early */ 1960 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1961 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1962 info->hw_queue = 1963 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1964 1965 if (invoke_tx_handlers_early(&tx)) 1966 return true; 1967 1968 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1969 return true; 1970 1971 if (!invoke_tx_handlers_late(&tx)) 1972 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1973 1974 return result; 1975 } 1976 1977 /* device xmit handlers */ 1978 1979 enum ieee80211_encrypt { 1980 ENCRYPT_NO, 1981 ENCRYPT_MGMT, 1982 ENCRYPT_DATA, 1983 }; 1984 1985 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1986 struct sk_buff *skb, 1987 int head_need, 1988 enum ieee80211_encrypt encrypt) 1989 { 1990 struct ieee80211_local *local = sdata->local; 1991 bool enc_tailroom; 1992 int tail_need = 0; 1993 1994 enc_tailroom = encrypt == ENCRYPT_MGMT || 1995 (encrypt == ENCRYPT_DATA && 1996 sdata->crypto_tx_tailroom_needed_cnt); 1997 1998 if (enc_tailroom) { 1999 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2000 tail_need -= skb_tailroom(skb); 2001 tail_need = max_t(int, tail_need, 0); 2002 } 2003 2004 if (skb_cloned(skb) && 2005 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2006 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2007 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2008 else if (head_need || tail_need) 2009 I802_DEBUG_INC(local->tx_expand_skb_head); 2010 else 2011 return 0; 2012 2013 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2014 wiphy_debug(local->hw.wiphy, 2015 "failed to reallocate TX buffer\n"); 2016 return -ENOMEM; 2017 } 2018 2019 return 0; 2020 } 2021 2022 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2023 struct sta_info *sta, struct sk_buff *skb) 2024 { 2025 struct ieee80211_local *local = sdata->local; 2026 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2027 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2028 int headroom; 2029 enum ieee80211_encrypt encrypt; 2030 2031 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2032 encrypt = ENCRYPT_NO; 2033 else if (ieee80211_is_mgmt(hdr->frame_control)) 2034 encrypt = ENCRYPT_MGMT; 2035 else 2036 encrypt = ENCRYPT_DATA; 2037 2038 headroom = local->tx_headroom; 2039 if (encrypt != ENCRYPT_NO) 2040 headroom += IEEE80211_ENCRYPT_HEADROOM; 2041 headroom -= skb_headroom(skb); 2042 headroom = max_t(int, 0, headroom); 2043 2044 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2045 ieee80211_free_txskb(&local->hw, skb); 2046 return; 2047 } 2048 2049 /* reload after potential resize */ 2050 hdr = (struct ieee80211_hdr *) skb->data; 2051 info->control.vif = &sdata->vif; 2052 2053 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2054 if (ieee80211_is_data(hdr->frame_control) && 2055 is_unicast_ether_addr(hdr->addr1)) { 2056 if (mesh_nexthop_resolve(sdata, skb)) 2057 return; /* skb queued: don't free */ 2058 } else { 2059 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2060 } 2061 } 2062 2063 ieee80211_set_qos_hdr(sdata, skb); 2064 ieee80211_tx(sdata, sta, skb, false); 2065 } 2066 2067 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2068 { 2069 struct ieee80211_radiotap_header *rthdr = 2070 (struct ieee80211_radiotap_header *)skb->data; 2071 2072 /* check for not even having the fixed radiotap header part */ 2073 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2074 return false; /* too short to be possibly valid */ 2075 2076 /* is it a header version we can trust to find length from? */ 2077 if (unlikely(rthdr->it_version)) 2078 return false; /* only version 0 is supported */ 2079 2080 /* does the skb contain enough to deliver on the alleged length? */ 2081 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2082 return false; /* skb too short for claimed rt header extent */ 2083 2084 return true; 2085 } 2086 2087 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2088 struct net_device *dev) 2089 { 2090 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2091 struct ieee80211_radiotap_iterator iterator; 2092 struct ieee80211_radiotap_header *rthdr = 2093 (struct ieee80211_radiotap_header *) skb->data; 2094 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2095 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2096 NULL); 2097 u16 txflags; 2098 u16 rate = 0; 2099 bool rate_found = false; 2100 u8 rate_retries = 0; 2101 u16 rate_flags = 0; 2102 u8 mcs_known, mcs_flags, mcs_bw; 2103 u16 vht_known; 2104 u8 vht_mcs = 0, vht_nss = 0; 2105 int i; 2106 2107 if (!ieee80211_validate_radiotap_len(skb)) 2108 return false; 2109 2110 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2111 IEEE80211_TX_CTL_DONTFRAG; 2112 2113 /* 2114 * for every radiotap entry that is present 2115 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2116 * entries present, or -EINVAL on error) 2117 */ 2118 2119 while (!ret) { 2120 ret = ieee80211_radiotap_iterator_next(&iterator); 2121 2122 if (ret) 2123 continue; 2124 2125 /* see if this argument is something we can use */ 2126 switch (iterator.this_arg_index) { 2127 /* 2128 * You must take care when dereferencing iterator.this_arg 2129 * for multibyte types... the pointer is not aligned. Use 2130 * get_unaligned((type *)iterator.this_arg) to dereference 2131 * iterator.this_arg for type "type" safely on all arches. 2132 */ 2133 case IEEE80211_RADIOTAP_FLAGS: 2134 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2135 /* 2136 * this indicates that the skb we have been 2137 * handed has the 32-bit FCS CRC at the end... 2138 * we should react to that by snipping it off 2139 * because it will be recomputed and added 2140 * on transmission 2141 */ 2142 if (skb->len < (iterator._max_length + FCS_LEN)) 2143 return false; 2144 2145 skb_trim(skb, skb->len - FCS_LEN); 2146 } 2147 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2148 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2149 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2150 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2151 break; 2152 2153 case IEEE80211_RADIOTAP_TX_FLAGS: 2154 txflags = get_unaligned_le16(iterator.this_arg); 2155 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2156 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2157 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2158 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2159 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2160 info->control.flags |= 2161 IEEE80211_TX_CTRL_DONT_REORDER; 2162 break; 2163 2164 case IEEE80211_RADIOTAP_RATE: 2165 rate = *iterator.this_arg; 2166 rate_flags = 0; 2167 rate_found = true; 2168 break; 2169 2170 case IEEE80211_RADIOTAP_ANTENNA: 2171 /* this can appear multiple times, keep a bitmap */ 2172 info->control.antennas |= BIT(*iterator.this_arg); 2173 break; 2174 2175 case IEEE80211_RADIOTAP_DATA_RETRIES: 2176 rate_retries = *iterator.this_arg; 2177 break; 2178 2179 case IEEE80211_RADIOTAP_MCS: 2180 mcs_known = iterator.this_arg[0]; 2181 mcs_flags = iterator.this_arg[1]; 2182 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2183 break; 2184 2185 rate_found = true; 2186 rate = iterator.this_arg[2]; 2187 rate_flags = IEEE80211_TX_RC_MCS; 2188 2189 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2190 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2191 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2192 2193 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2194 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2195 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2196 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2197 2198 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2199 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2200 info->flags |= IEEE80211_TX_CTL_LDPC; 2201 2202 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2203 u8 stbc = u8_get_bits(mcs_flags, 2204 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2205 2206 info->flags |= 2207 u32_encode_bits(stbc, 2208 IEEE80211_TX_CTL_STBC); 2209 } 2210 break; 2211 2212 case IEEE80211_RADIOTAP_VHT: 2213 vht_known = get_unaligned_le16(iterator.this_arg); 2214 rate_found = true; 2215 2216 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2217 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2218 (iterator.this_arg[2] & 2219 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2220 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2221 if (vht_known & 2222 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2223 if (iterator.this_arg[3] == 1) 2224 rate_flags |= 2225 IEEE80211_TX_RC_40_MHZ_WIDTH; 2226 else if (iterator.this_arg[3] == 4) 2227 rate_flags |= 2228 IEEE80211_TX_RC_80_MHZ_WIDTH; 2229 else if (iterator.this_arg[3] == 11) 2230 rate_flags |= 2231 IEEE80211_TX_RC_160_MHZ_WIDTH; 2232 } 2233 2234 vht_mcs = iterator.this_arg[4] >> 4; 2235 if (vht_mcs > 11) 2236 vht_mcs = 0; 2237 vht_nss = iterator.this_arg[4] & 0xF; 2238 if (!vht_nss || vht_nss > 8) 2239 vht_nss = 1; 2240 break; 2241 2242 /* 2243 * Please update the file 2244 * Documentation/networking/mac80211-injection.rst 2245 * when parsing new fields here. 2246 */ 2247 2248 default: 2249 break; 2250 } 2251 } 2252 2253 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2254 return false; 2255 2256 if (rate_found) { 2257 struct ieee80211_supported_band *sband = 2258 local->hw.wiphy->bands[info->band]; 2259 2260 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2261 2262 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2263 info->control.rates[i].idx = -1; 2264 info->control.rates[i].flags = 0; 2265 info->control.rates[i].count = 0; 2266 } 2267 2268 if (rate_flags & IEEE80211_TX_RC_MCS) { 2269 /* reset antennas if not enough */ 2270 if (IEEE80211_HT_MCS_CHAINS(rate) > 2271 hweight8(info->control.antennas)) 2272 info->control.antennas = 0; 2273 2274 info->control.rates[0].idx = rate; 2275 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2276 /* reset antennas if not enough */ 2277 if (vht_nss > hweight8(info->control.antennas)) 2278 info->control.antennas = 0; 2279 2280 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2281 vht_nss); 2282 } else if (sband) { 2283 for (i = 0; i < sband->n_bitrates; i++) { 2284 if (rate * 5 != sband->bitrates[i].bitrate) 2285 continue; 2286 2287 info->control.rates[0].idx = i; 2288 break; 2289 } 2290 } 2291 2292 if (info->control.rates[0].idx < 0) 2293 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2294 2295 info->control.rates[0].flags = rate_flags; 2296 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2297 local->hw.max_rate_tries); 2298 } 2299 2300 return true; 2301 } 2302 2303 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2304 struct net_device *dev) 2305 { 2306 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2307 struct ieee80211_chanctx_conf *chanctx_conf; 2308 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2309 struct ieee80211_hdr *hdr; 2310 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2311 struct cfg80211_chan_def *chandef; 2312 u16 len_rthdr; 2313 int hdrlen; 2314 2315 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2316 if (unlikely(!ieee80211_sdata_running(sdata))) 2317 goto fail; 2318 2319 memset(info, 0, sizeof(*info)); 2320 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2321 IEEE80211_TX_CTL_INJECTED; 2322 2323 /* Sanity-check the length of the radiotap header */ 2324 if (!ieee80211_validate_radiotap_len(skb)) 2325 goto fail; 2326 2327 /* we now know there is a radiotap header with a length we can use */ 2328 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2329 2330 /* 2331 * fix up the pointers accounting for the radiotap 2332 * header still being in there. We are being given 2333 * a precooked IEEE80211 header so no need for 2334 * normal processing 2335 */ 2336 skb_set_mac_header(skb, len_rthdr); 2337 /* 2338 * these are just fixed to the end of the rt area since we 2339 * don't have any better information and at this point, nobody cares 2340 */ 2341 skb_set_network_header(skb, len_rthdr); 2342 skb_set_transport_header(skb, len_rthdr); 2343 2344 if (skb->len < len_rthdr + 2) 2345 goto fail; 2346 2347 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2348 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2349 2350 if (skb->len < len_rthdr + hdrlen) 2351 goto fail; 2352 2353 /* 2354 * Initialize skb->protocol if the injected frame is a data frame 2355 * carrying a rfc1042 header 2356 */ 2357 if (ieee80211_is_data(hdr->frame_control) && 2358 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2359 u8 *payload = (u8 *)hdr + hdrlen; 2360 2361 if (ether_addr_equal(payload, rfc1042_header)) 2362 skb->protocol = cpu_to_be16((payload[6] << 8) | 2363 payload[7]); 2364 } 2365 2366 rcu_read_lock(); 2367 2368 /* 2369 * We process outgoing injected frames that have a local address 2370 * we handle as though they are non-injected frames. 2371 * This code here isn't entirely correct, the local MAC address 2372 * isn't always enough to find the interface to use; for proper 2373 * VLAN support we have an nl80211-based mechanism. 2374 * 2375 * This is necessary, for example, for old hostapd versions that 2376 * don't use nl80211-based management TX/RX. 2377 */ 2378 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2379 if (!ieee80211_sdata_running(tmp_sdata)) 2380 continue; 2381 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2382 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2383 continue; 2384 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2385 sdata = tmp_sdata; 2386 break; 2387 } 2388 } 2389 2390 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2391 if (!chanctx_conf) { 2392 tmp_sdata = rcu_dereference(local->monitor_sdata); 2393 if (tmp_sdata) 2394 chanctx_conf = 2395 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2396 } 2397 2398 if (chanctx_conf) 2399 chandef = &chanctx_conf->def; 2400 else 2401 goto fail_rcu; 2402 2403 /* 2404 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2405 * shouldn't transmit on disabled channels. 2406 */ 2407 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2408 IEEE80211_CHAN_DISABLED)) 2409 goto fail_rcu; 2410 2411 /* 2412 * Frame injection is not allowed if beaconing is not allowed 2413 * or if we need radar detection. Beaconing is usually not allowed when 2414 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2415 * Passive scan is also used in world regulatory domains where 2416 * your country is not known and as such it should be treated as 2417 * NO TX unless the channel is explicitly allowed in which case 2418 * your current regulatory domain would not have the passive scan 2419 * flag. 2420 * 2421 * Since AP mode uses monitor interfaces to inject/TX management 2422 * frames we can make AP mode the exception to this rule once it 2423 * supports radar detection as its implementation can deal with 2424 * radar detection by itself. We can do that later by adding a 2425 * monitor flag interfaces used for AP support. 2426 */ 2427 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2428 sdata->vif.type)) 2429 goto fail_rcu; 2430 2431 info->band = chandef->chan->band; 2432 2433 /* Initialize skb->priority according to frame type and TID class, 2434 * with respect to the sub interface that the frame will actually 2435 * be transmitted on. If the DONT_REORDER flag is set, the original 2436 * skb-priority is preserved to assure frames injected with this 2437 * flag are not reordered relative to each other. 2438 */ 2439 ieee80211_select_queue_80211(sdata, skb, hdr); 2440 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2441 2442 /* 2443 * Process the radiotap header. This will now take into account the 2444 * selected chandef above to accurately set injection rates and 2445 * retransmissions. 2446 */ 2447 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2448 goto fail_rcu; 2449 2450 /* remove the injection radiotap header */ 2451 skb_pull(skb, len_rthdr); 2452 2453 ieee80211_xmit(sdata, NULL, skb); 2454 rcu_read_unlock(); 2455 2456 return NETDEV_TX_OK; 2457 2458 fail_rcu: 2459 rcu_read_unlock(); 2460 fail: 2461 dev_kfree_skb(skb); 2462 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2463 } 2464 2465 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2466 { 2467 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2468 2469 return ethertype == ETH_P_TDLS && 2470 skb->len > 14 && 2471 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2472 } 2473 2474 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2475 struct sk_buff *skb, 2476 struct sta_info **sta_out) 2477 { 2478 struct sta_info *sta; 2479 2480 switch (sdata->vif.type) { 2481 case NL80211_IFTYPE_AP_VLAN: 2482 sta = rcu_dereference(sdata->u.vlan.sta); 2483 if (sta) { 2484 *sta_out = sta; 2485 return 0; 2486 } else if (sdata->wdev.use_4addr) { 2487 return -ENOLINK; 2488 } 2489 fallthrough; 2490 case NL80211_IFTYPE_AP: 2491 case NL80211_IFTYPE_OCB: 2492 case NL80211_IFTYPE_ADHOC: 2493 if (is_multicast_ether_addr(skb->data)) { 2494 *sta_out = ERR_PTR(-ENOENT); 2495 return 0; 2496 } 2497 sta = sta_info_get_bss(sdata, skb->data); 2498 break; 2499 #ifdef CONFIG_MAC80211_MESH 2500 case NL80211_IFTYPE_MESH_POINT: 2501 /* determined much later */ 2502 *sta_out = NULL; 2503 return 0; 2504 #endif 2505 case NL80211_IFTYPE_STATION: 2506 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2507 sta = sta_info_get(sdata, skb->data); 2508 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2509 if (test_sta_flag(sta, 2510 WLAN_STA_TDLS_PEER_AUTH)) { 2511 *sta_out = sta; 2512 return 0; 2513 } 2514 2515 /* 2516 * TDLS link during setup - throw out frames to 2517 * peer. Allow TDLS-setup frames to unauthorized 2518 * peers for the special case of a link teardown 2519 * after a TDLS sta is removed due to being 2520 * unreachable. 2521 */ 2522 if (!ieee80211_is_tdls_setup(skb)) 2523 return -EINVAL; 2524 } 2525 2526 } 2527 2528 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2529 if (!sta) 2530 return -ENOLINK; 2531 break; 2532 default: 2533 return -EINVAL; 2534 } 2535 2536 *sta_out = sta ?: ERR_PTR(-ENOENT); 2537 return 0; 2538 } 2539 2540 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2541 struct sk_buff *skb, 2542 u32 *info_flags, 2543 u64 *cookie) 2544 { 2545 struct sk_buff *ack_skb; 2546 u16 info_id = 0; 2547 2548 if (skb->sk) 2549 ack_skb = skb_clone_sk(skb); 2550 else 2551 ack_skb = skb_clone(skb, GFP_ATOMIC); 2552 2553 if (ack_skb) { 2554 unsigned long flags; 2555 int id; 2556 2557 spin_lock_irqsave(&local->ack_status_lock, flags); 2558 id = idr_alloc(&local->ack_status_frames, ack_skb, 2559 1, 0x2000, GFP_ATOMIC); 2560 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2561 2562 if (id >= 0) { 2563 info_id = id; 2564 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2565 if (cookie) { 2566 *cookie = ieee80211_mgmt_tx_cookie(local); 2567 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2568 } 2569 } else { 2570 kfree_skb(ack_skb); 2571 } 2572 } 2573 2574 return info_id; 2575 } 2576 2577 /** 2578 * ieee80211_build_hdr - build 802.11 header in the given frame 2579 * @sdata: virtual interface to build the header for 2580 * @skb: the skb to build the header in 2581 * @info_flags: skb flags to set 2582 * @sta: the station pointer 2583 * @ctrl_flags: info control flags to set 2584 * @cookie: cookie pointer to fill (if not %NULL) 2585 * 2586 * This function takes the skb with 802.3 header and reformats the header to 2587 * the appropriate IEEE 802.11 header based on which interface the packet is 2588 * being transmitted on. 2589 * 2590 * Note that this function also takes care of the TX status request and 2591 * potential unsharing of the SKB - this needs to be interleaved with the 2592 * header building. 2593 * 2594 * The function requires the read-side RCU lock held 2595 * 2596 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2597 */ 2598 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2599 struct sk_buff *skb, u32 info_flags, 2600 struct sta_info *sta, u32 ctrl_flags, 2601 u64 *cookie) 2602 { 2603 struct ieee80211_local *local = sdata->local; 2604 struct ieee80211_tx_info *info; 2605 int head_need; 2606 u16 ethertype, hdrlen, meshhdrlen = 0; 2607 __le16 fc; 2608 struct ieee80211_hdr hdr; 2609 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2610 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2611 const u8 *encaps_data; 2612 int encaps_len, skip_header_bytes; 2613 bool wme_sta = false, authorized = false; 2614 bool tdls_peer; 2615 bool multicast; 2616 u16 info_id = 0; 2617 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2618 enum nl80211_band band; 2619 int ret; 2620 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2621 2622 if (IS_ERR(sta)) 2623 sta = NULL; 2624 2625 #ifdef CONFIG_MAC80211_DEBUGFS 2626 if (local->force_tx_status) 2627 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2628 #endif 2629 2630 /* convert Ethernet header to proper 802.11 header (based on 2631 * operation mode) */ 2632 ethertype = (skb->data[12] << 8) | skb->data[13]; 2633 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2634 2635 if (!ieee80211_vif_is_mld(&sdata->vif)) 2636 chanctx_conf = 2637 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2638 2639 switch (sdata->vif.type) { 2640 case NL80211_IFTYPE_AP_VLAN: 2641 if (sdata->wdev.use_4addr) { 2642 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2643 /* RA TA DA SA */ 2644 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2645 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2646 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2647 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2648 hdrlen = 30; 2649 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2650 wme_sta = sta->sta.wme; 2651 } 2652 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2653 struct ieee80211_sub_if_data *ap_sdata; 2654 2655 /* override chanctx_conf from AP (we don't have one) */ 2656 ap_sdata = container_of(sdata->bss, 2657 struct ieee80211_sub_if_data, 2658 u.ap); 2659 chanctx_conf = 2660 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2661 } 2662 if (sdata->wdev.use_4addr) 2663 break; 2664 fallthrough; 2665 case NL80211_IFTYPE_AP: 2666 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2667 /* DA BSSID SA */ 2668 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2669 2670 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2671 struct ieee80211_link_data *link; 2672 2673 link_id = sta->deflink.link_id; 2674 link = rcu_dereference(sdata->link[link_id]); 2675 if (WARN_ON(!link)) { 2676 ret = -ENOLINK; 2677 goto free; 2678 } 2679 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2680 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2681 (sta && sta->sta.mlo)) { 2682 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2683 } else { 2684 struct ieee80211_bss_conf *conf; 2685 2686 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2687 if (unlikely(!conf)) { 2688 ret = -ENOLINK; 2689 goto free; 2690 } 2691 2692 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2693 } 2694 2695 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2696 hdrlen = 24; 2697 break; 2698 #ifdef CONFIG_MAC80211_MESH 2699 case NL80211_IFTYPE_MESH_POINT: 2700 if (!is_multicast_ether_addr(skb->data)) { 2701 struct sta_info *next_hop; 2702 bool mpp_lookup = true; 2703 2704 mpath = mesh_path_lookup(sdata, skb->data); 2705 if (mpath) { 2706 mpp_lookup = false; 2707 next_hop = rcu_dereference(mpath->next_hop); 2708 if (!next_hop || 2709 !(mpath->flags & (MESH_PATH_ACTIVE | 2710 MESH_PATH_RESOLVING))) 2711 mpp_lookup = true; 2712 } 2713 2714 if (mpp_lookup) { 2715 mppath = mpp_path_lookup(sdata, skb->data); 2716 if (mppath) 2717 mppath->exp_time = jiffies; 2718 } 2719 2720 if (mppath && mpath) 2721 mesh_path_del(sdata, mpath->dst); 2722 } 2723 2724 /* 2725 * Use address extension if it is a packet from 2726 * another interface or if we know the destination 2727 * is being proxied by a portal (i.e. portal address 2728 * differs from proxied address) 2729 */ 2730 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2731 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2732 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2733 skb->data, skb->data + ETH_ALEN); 2734 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2735 NULL, NULL); 2736 } else { 2737 /* DS -> MBSS (802.11-2012 13.11.3.3). 2738 * For unicast with unknown forwarding information, 2739 * destination might be in the MBSS or if that fails 2740 * forwarded to another mesh gate. In either case 2741 * resolution will be handled in ieee80211_xmit(), so 2742 * leave the original DA. This also works for mcast */ 2743 const u8 *mesh_da = skb->data; 2744 2745 if (mppath) 2746 mesh_da = mppath->mpp; 2747 else if (mpath) 2748 mesh_da = mpath->dst; 2749 2750 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2751 mesh_da, sdata->vif.addr); 2752 if (is_multicast_ether_addr(mesh_da)) 2753 /* DA TA mSA AE:SA */ 2754 meshhdrlen = ieee80211_new_mesh_header( 2755 sdata, &mesh_hdr, 2756 skb->data + ETH_ALEN, NULL); 2757 else 2758 /* RA TA mDA mSA AE:DA SA */ 2759 meshhdrlen = ieee80211_new_mesh_header( 2760 sdata, &mesh_hdr, skb->data, 2761 skb->data + ETH_ALEN); 2762 2763 } 2764 2765 /* For injected frames, fill RA right away as nexthop lookup 2766 * will be skipped. 2767 */ 2768 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2769 is_zero_ether_addr(hdr.addr1)) 2770 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2771 break; 2772 #endif 2773 case NL80211_IFTYPE_STATION: 2774 /* we already did checks when looking up the RA STA */ 2775 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2776 2777 if (tdls_peer) { 2778 /* For TDLS only one link can be valid with peer STA */ 2779 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2780 struct ieee80211_link_data *link; 2781 2782 /* DA SA BSSID */ 2783 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2784 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2785 link = rcu_dereference(sdata->link[tdls_link_id]); 2786 if (WARN_ON_ONCE(!link)) { 2787 ret = -EINVAL; 2788 goto free; 2789 } 2790 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2791 hdrlen = 24; 2792 } else if (sdata->u.mgd.use_4addr && 2793 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2794 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2795 IEEE80211_FCTL_TODS); 2796 /* RA TA DA SA */ 2797 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2798 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2799 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2800 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2801 hdrlen = 30; 2802 } else { 2803 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2804 /* BSSID SA DA */ 2805 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2806 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2807 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2808 hdrlen = 24; 2809 } 2810 break; 2811 case NL80211_IFTYPE_OCB: 2812 /* DA SA BSSID */ 2813 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2814 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2815 eth_broadcast_addr(hdr.addr3); 2816 hdrlen = 24; 2817 break; 2818 case NL80211_IFTYPE_ADHOC: 2819 /* DA SA BSSID */ 2820 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2821 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2822 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2823 hdrlen = 24; 2824 break; 2825 default: 2826 ret = -EINVAL; 2827 goto free; 2828 } 2829 2830 if (!chanctx_conf) { 2831 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2832 ret = -ENOTCONN; 2833 goto free; 2834 } 2835 /* MLD transmissions must not rely on the band */ 2836 band = 0; 2837 } else { 2838 band = chanctx_conf->def.chan->band; 2839 } 2840 2841 multicast = is_multicast_ether_addr(hdr.addr1); 2842 2843 /* sta is always NULL for mesh */ 2844 if (sta) { 2845 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2846 wme_sta = sta->sta.wme; 2847 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2848 /* For mesh, the use of the QoS header is mandatory */ 2849 wme_sta = true; 2850 } 2851 2852 /* receiver does QoS (which also means we do) use it */ 2853 if (wme_sta) { 2854 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2855 hdrlen += 2; 2856 } 2857 2858 /* 2859 * Drop unicast frames to unauthorised stations unless they are 2860 * EAPOL frames from the local station. 2861 */ 2862 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2863 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2864 !multicast && !authorized && 2865 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2866 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2867 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2868 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2869 sdata->name, hdr.addr1); 2870 #endif 2871 2872 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2873 2874 ret = -EPERM; 2875 goto free; 2876 } 2877 2878 if (unlikely(!multicast && 2879 (sk_requests_wifi_status(skb->sk) || 2880 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2881 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2882 cookie); 2883 2884 /* 2885 * If the skb is shared we need to obtain our own copy. 2886 */ 2887 skb = skb_share_check(skb, GFP_ATOMIC); 2888 if (unlikely(!skb)) { 2889 ret = -ENOMEM; 2890 goto free; 2891 } 2892 2893 hdr.frame_control = fc; 2894 hdr.duration_id = 0; 2895 hdr.seq_ctrl = 0; 2896 2897 skip_header_bytes = ETH_HLEN; 2898 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2899 encaps_data = bridge_tunnel_header; 2900 encaps_len = sizeof(bridge_tunnel_header); 2901 skip_header_bytes -= 2; 2902 } else if (ethertype >= ETH_P_802_3_MIN) { 2903 encaps_data = rfc1042_header; 2904 encaps_len = sizeof(rfc1042_header); 2905 skip_header_bytes -= 2; 2906 } else { 2907 encaps_data = NULL; 2908 encaps_len = 0; 2909 } 2910 2911 skb_pull(skb, skip_header_bytes); 2912 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2913 2914 /* 2915 * So we need to modify the skb header and hence need a copy of 2916 * that. The head_need variable above doesn't, so far, include 2917 * the needed header space that we don't need right away. If we 2918 * can, then we don't reallocate right now but only after the 2919 * frame arrives at the master device (if it does...) 2920 * 2921 * If we cannot, however, then we will reallocate to include all 2922 * the ever needed space. Also, if we need to reallocate it anyway, 2923 * make it big enough for everything we may ever need. 2924 */ 2925 2926 if (head_need > 0 || skb_cloned(skb)) { 2927 head_need += IEEE80211_ENCRYPT_HEADROOM; 2928 head_need += local->tx_headroom; 2929 head_need = max_t(int, 0, head_need); 2930 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2931 ieee80211_free_txskb(&local->hw, skb); 2932 skb = NULL; 2933 return ERR_PTR(-ENOMEM); 2934 } 2935 } 2936 2937 if (encaps_data) 2938 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2939 2940 #ifdef CONFIG_MAC80211_MESH 2941 if (meshhdrlen > 0) 2942 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2943 #endif 2944 2945 if (ieee80211_is_data_qos(fc)) { 2946 __le16 *qos_control; 2947 2948 qos_control = skb_push(skb, 2); 2949 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2950 /* 2951 * Maybe we could actually set some fields here, for now just 2952 * initialise to zero to indicate no special operation. 2953 */ 2954 *qos_control = 0; 2955 } else 2956 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2957 2958 skb_reset_mac_header(skb); 2959 2960 info = IEEE80211_SKB_CB(skb); 2961 memset(info, 0, sizeof(*info)); 2962 2963 info->flags = info_flags; 2964 if (info_id) { 2965 info->status_data = info_id; 2966 info->status_data_idr = 1; 2967 } 2968 info->band = band; 2969 2970 if (likely(!cookie)) { 2971 ctrl_flags |= u32_encode_bits(link_id, 2972 IEEE80211_TX_CTRL_MLO_LINK); 2973 } else { 2974 unsigned int pre_conf_link_id; 2975 2976 /* 2977 * ctrl_flags already have been set by 2978 * ieee80211_tx_control_port(), here 2979 * we just sanity check that 2980 */ 2981 2982 pre_conf_link_id = u32_get_bits(ctrl_flags, 2983 IEEE80211_TX_CTRL_MLO_LINK); 2984 2985 if (pre_conf_link_id != link_id && 2986 link_id != IEEE80211_LINK_UNSPECIFIED) { 2987 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2988 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2989 sdata->name, hdr.addr1, 2990 pre_conf_link_id, link_id); 2991 #endif 2992 ret = -EINVAL; 2993 goto free; 2994 } 2995 } 2996 2997 info->control.flags = ctrl_flags; 2998 2999 return skb; 3000 free: 3001 kfree_skb(skb); 3002 return ERR_PTR(ret); 3003 } 3004 3005 /* 3006 * fast-xmit overview 3007 * 3008 * The core idea of this fast-xmit is to remove per-packet checks by checking 3009 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3010 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3011 * much less work can be done per packet. For example, fragmentation must be 3012 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3013 * in the code here. 3014 * 3015 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3016 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3017 * 3018 * The most difficult part of this is that when any of these assumptions 3019 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3020 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3021 * since the per-packet code no longer checks the conditions. This is reflected 3022 * by the calls to these functions throughout the rest of the code, and must be 3023 * maintained if any of the TX path checks change. 3024 */ 3025 3026 void ieee80211_check_fast_xmit(struct sta_info *sta) 3027 { 3028 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3029 struct ieee80211_local *local = sta->local; 3030 struct ieee80211_sub_if_data *sdata = sta->sdata; 3031 struct ieee80211_hdr *hdr = (void *)build.hdr; 3032 struct ieee80211_chanctx_conf *chanctx_conf; 3033 __le16 fc; 3034 3035 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3036 return; 3037 3038 if (ieee80211_vif_is_mesh(&sdata->vif)) 3039 mesh_fast_tx_flush_sta(sdata, sta); 3040 3041 /* Locking here protects both the pointer itself, and against concurrent 3042 * invocations winning data access races to, e.g., the key pointer that 3043 * is used. 3044 * Without it, the invocation of this function right after the key 3045 * pointer changes wouldn't be sufficient, as another CPU could access 3046 * the pointer, then stall, and then do the cache update after the CPU 3047 * that invalidated the key. 3048 * With the locking, such scenarios cannot happen as the check for the 3049 * key and the fast-tx assignment are done atomically, so the CPU that 3050 * modifies the key will either wait or other one will see the key 3051 * cleared/changed already. 3052 */ 3053 spin_lock_bh(&sta->lock); 3054 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3055 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3056 sdata->vif.type == NL80211_IFTYPE_STATION) 3057 goto out; 3058 3059 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3060 goto out; 3061 3062 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3063 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3064 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3065 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3066 goto out; 3067 3068 if (sdata->noack_map) 3069 goto out; 3070 3071 /* fast-xmit doesn't handle fragmentation at all */ 3072 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3073 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3074 goto out; 3075 3076 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3077 rcu_read_lock(); 3078 chanctx_conf = 3079 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3080 if (!chanctx_conf) { 3081 rcu_read_unlock(); 3082 goto out; 3083 } 3084 build.band = chanctx_conf->def.chan->band; 3085 rcu_read_unlock(); 3086 } else { 3087 /* MLD transmissions must not rely on the band */ 3088 build.band = 0; 3089 } 3090 3091 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3092 3093 switch (sdata->vif.type) { 3094 case NL80211_IFTYPE_ADHOC: 3095 /* DA SA BSSID */ 3096 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3097 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3098 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3099 build.hdr_len = 24; 3100 break; 3101 case NL80211_IFTYPE_STATION: 3102 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3103 /* For TDLS only one link can be valid with peer STA */ 3104 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3105 struct ieee80211_link_data *link; 3106 3107 /* DA SA BSSID */ 3108 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3109 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3110 rcu_read_lock(); 3111 link = rcu_dereference(sdata->link[tdls_link_id]); 3112 if (!WARN_ON_ONCE(!link)) 3113 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3114 rcu_read_unlock(); 3115 build.hdr_len = 24; 3116 break; 3117 } 3118 3119 if (sdata->u.mgd.use_4addr) { 3120 /* non-regular ethertype cannot use the fastpath */ 3121 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3122 IEEE80211_FCTL_TODS); 3123 /* RA TA DA SA */ 3124 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3125 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3126 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3127 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3128 build.hdr_len = 30; 3129 break; 3130 } 3131 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3132 /* BSSID SA DA */ 3133 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3134 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3135 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3136 build.hdr_len = 24; 3137 break; 3138 case NL80211_IFTYPE_AP_VLAN: 3139 if (sdata->wdev.use_4addr) { 3140 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3141 IEEE80211_FCTL_TODS); 3142 /* RA TA DA SA */ 3143 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3144 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3145 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3146 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3147 build.hdr_len = 30; 3148 break; 3149 } 3150 fallthrough; 3151 case NL80211_IFTYPE_AP: 3152 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3153 /* DA BSSID SA */ 3154 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3155 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3156 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3157 } else { 3158 unsigned int link_id = sta->deflink.link_id; 3159 struct ieee80211_link_data *link; 3160 3161 rcu_read_lock(); 3162 link = rcu_dereference(sdata->link[link_id]); 3163 if (WARN_ON(!link)) { 3164 rcu_read_unlock(); 3165 goto out; 3166 } 3167 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3168 rcu_read_unlock(); 3169 } 3170 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3171 build.hdr_len = 24; 3172 break; 3173 default: 3174 /* not handled on fast-xmit */ 3175 goto out; 3176 } 3177 3178 if (sta->sta.wme) { 3179 build.hdr_len += 2; 3180 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3181 } 3182 3183 /* We store the key here so there's no point in using rcu_dereference() 3184 * but that's fine because the code that changes the pointers will call 3185 * this function after doing so. For a single CPU that would be enough, 3186 * for multiple see the comment above. 3187 */ 3188 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3189 if (!build.key) 3190 build.key = rcu_access_pointer(sdata->default_unicast_key); 3191 if (build.key) { 3192 bool gen_iv, iv_spc, mmic; 3193 3194 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3195 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3196 mmic = build.key->conf.flags & 3197 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3198 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3199 3200 /* don't handle software crypto */ 3201 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3202 goto out; 3203 3204 /* Key is being removed */ 3205 if (build.key->flags & KEY_FLAG_TAINTED) 3206 goto out; 3207 3208 switch (build.key->conf.cipher) { 3209 case WLAN_CIPHER_SUITE_CCMP: 3210 case WLAN_CIPHER_SUITE_CCMP_256: 3211 if (gen_iv) 3212 build.pn_offs = build.hdr_len; 3213 if (gen_iv || iv_spc) 3214 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3215 break; 3216 case WLAN_CIPHER_SUITE_GCMP: 3217 case WLAN_CIPHER_SUITE_GCMP_256: 3218 if (gen_iv) 3219 build.pn_offs = build.hdr_len; 3220 if (gen_iv || iv_spc) 3221 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3222 break; 3223 case WLAN_CIPHER_SUITE_TKIP: 3224 /* cannot handle MMIC or IV generation in xmit-fast */ 3225 if (mmic || gen_iv) 3226 goto out; 3227 if (iv_spc) 3228 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3229 break; 3230 case WLAN_CIPHER_SUITE_WEP40: 3231 case WLAN_CIPHER_SUITE_WEP104: 3232 /* cannot handle IV generation in fast-xmit */ 3233 if (gen_iv) 3234 goto out; 3235 if (iv_spc) 3236 build.hdr_len += IEEE80211_WEP_IV_LEN; 3237 break; 3238 case WLAN_CIPHER_SUITE_AES_CMAC: 3239 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3240 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3241 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3242 WARN(1, 3243 "management cipher suite 0x%x enabled for data\n", 3244 build.key->conf.cipher); 3245 goto out; 3246 default: 3247 /* we don't know how to generate IVs for this at all */ 3248 if (WARN_ON(gen_iv)) 3249 goto out; 3250 } 3251 3252 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3253 } 3254 3255 hdr->frame_control = fc; 3256 3257 memcpy(build.hdr + build.hdr_len, 3258 rfc1042_header, sizeof(rfc1042_header)); 3259 build.hdr_len += sizeof(rfc1042_header); 3260 3261 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3262 /* if the kmemdup fails, continue w/o fast_tx */ 3263 3264 out: 3265 /* we might have raced against another call to this function */ 3266 old = rcu_dereference_protected(sta->fast_tx, 3267 lockdep_is_held(&sta->lock)); 3268 rcu_assign_pointer(sta->fast_tx, fast_tx); 3269 if (old) 3270 kfree_rcu(old, rcu_head); 3271 spin_unlock_bh(&sta->lock); 3272 } 3273 3274 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3275 { 3276 struct sta_info *sta; 3277 3278 rcu_read_lock(); 3279 list_for_each_entry_rcu(sta, &local->sta_list, list) 3280 ieee80211_check_fast_xmit(sta); 3281 rcu_read_unlock(); 3282 } 3283 3284 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3285 { 3286 struct ieee80211_local *local = sdata->local; 3287 struct sta_info *sta; 3288 3289 rcu_read_lock(); 3290 3291 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3292 if (sdata != sta->sdata && 3293 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3294 continue; 3295 ieee80211_check_fast_xmit(sta); 3296 } 3297 3298 rcu_read_unlock(); 3299 } 3300 3301 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3302 { 3303 struct ieee80211_fast_tx *fast_tx; 3304 3305 spin_lock_bh(&sta->lock); 3306 fast_tx = rcu_dereference_protected(sta->fast_tx, 3307 lockdep_is_held(&sta->lock)); 3308 RCU_INIT_POINTER(sta->fast_tx, NULL); 3309 spin_unlock_bh(&sta->lock); 3310 3311 if (fast_tx) 3312 kfree_rcu(fast_tx, rcu_head); 3313 } 3314 3315 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3316 struct sk_buff *skb, int headroom) 3317 { 3318 if (skb_headroom(skb) < headroom) { 3319 I802_DEBUG_INC(local->tx_expand_skb_head); 3320 3321 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3322 wiphy_debug(local->hw.wiphy, 3323 "failed to reallocate TX buffer\n"); 3324 return false; 3325 } 3326 } 3327 3328 return true; 3329 } 3330 3331 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3332 struct ieee80211_fast_tx *fast_tx, 3333 struct sk_buff *skb) 3334 { 3335 struct ieee80211_local *local = sdata->local; 3336 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3337 struct ieee80211_hdr *hdr; 3338 struct ethhdr *amsdu_hdr; 3339 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3340 int subframe_len = skb->len - hdr_len; 3341 void *data; 3342 u8 *qc, *h_80211_src, *h_80211_dst; 3343 const u8 *bssid; 3344 3345 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3346 return false; 3347 3348 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3349 return true; 3350 3351 if (!ieee80211_amsdu_realloc_pad(local, skb, 3352 sizeof(*amsdu_hdr) + 3353 local->hw.extra_tx_headroom)) 3354 return false; 3355 3356 data = skb_push(skb, sizeof(*amsdu_hdr)); 3357 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3358 hdr = data; 3359 amsdu_hdr = data + hdr_len; 3360 /* h_80211_src/dst is addr* field within hdr */ 3361 h_80211_src = data + fast_tx->sa_offs; 3362 h_80211_dst = data + fast_tx->da_offs; 3363 3364 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3365 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3366 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3367 3368 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3369 * fields needs to be changed to BSSID for A-MSDU frames depending 3370 * on FromDS/ToDS values. 3371 */ 3372 switch (sdata->vif.type) { 3373 case NL80211_IFTYPE_STATION: 3374 bssid = sdata->vif.cfg.ap_addr; 3375 break; 3376 case NL80211_IFTYPE_AP: 3377 case NL80211_IFTYPE_AP_VLAN: 3378 bssid = sdata->vif.addr; 3379 break; 3380 default: 3381 bssid = NULL; 3382 } 3383 3384 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3385 ether_addr_copy(h_80211_src, bssid); 3386 3387 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3388 ether_addr_copy(h_80211_dst, bssid); 3389 3390 qc = ieee80211_get_qos_ctl(hdr); 3391 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3392 3393 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3394 3395 return true; 3396 } 3397 3398 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3399 struct sta_info *sta, 3400 struct ieee80211_fast_tx *fast_tx, 3401 struct sk_buff *skb, 3402 const u8 *da, const u8 *sa) 3403 { 3404 struct ieee80211_local *local = sdata->local; 3405 struct fq *fq = &local->fq; 3406 struct fq_tin *tin; 3407 struct fq_flow *flow; 3408 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3409 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3410 struct txq_info *txqi; 3411 struct sk_buff **frag_tail, *head; 3412 int subframe_len = skb->len - ETH_ALEN; 3413 u8 max_subframes = sta->sta.max_amsdu_subframes; 3414 int max_frags = local->hw.max_tx_fragments; 3415 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3416 int orig_truesize; 3417 u32 flow_idx; 3418 __be16 len; 3419 void *data; 3420 bool ret = false; 3421 unsigned int orig_len; 3422 int n = 2, nfrags, pad = 0; 3423 u16 hdrlen; 3424 3425 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3426 return false; 3427 3428 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3429 return false; 3430 3431 if (ieee80211_vif_is_mesh(&sdata->vif)) 3432 return false; 3433 3434 if (skb_is_gso(skb)) 3435 return false; 3436 3437 if (!txq) 3438 return false; 3439 3440 txqi = to_txq_info(txq); 3441 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3442 return false; 3443 3444 if (sta->sta.cur->max_rc_amsdu_len) 3445 max_amsdu_len = min_t(int, max_amsdu_len, 3446 sta->sta.cur->max_rc_amsdu_len); 3447 3448 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3449 max_amsdu_len = min_t(int, max_amsdu_len, 3450 sta->sta.cur->max_tid_amsdu_len[tid]); 3451 3452 flow_idx = fq_flow_idx(fq, skb); 3453 3454 spin_lock_bh(&fq->lock); 3455 3456 /* TODO: Ideally aggregation should be done on dequeue to remain 3457 * responsive to environment changes. 3458 */ 3459 3460 tin = &txqi->tin; 3461 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3462 head = skb_peek_tail(&flow->queue); 3463 if (!head || skb_is_gso(head)) 3464 goto out; 3465 3466 orig_truesize = head->truesize; 3467 orig_len = head->len; 3468 3469 if (skb->len + head->len > max_amsdu_len) 3470 goto out; 3471 3472 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3473 nfrags += 1 + skb_shinfo(head)->nr_frags; 3474 frag_tail = &skb_shinfo(head)->frag_list; 3475 while (*frag_tail) { 3476 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3477 frag_tail = &(*frag_tail)->next; 3478 n++; 3479 } 3480 3481 if (max_subframes && n > max_subframes) 3482 goto out; 3483 3484 if (max_frags && nfrags > max_frags) 3485 goto out; 3486 3487 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3488 goto out; 3489 3490 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3491 goto out; 3492 3493 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3494 * and frag_tail should be &skb_shinfo(head)->frag_list. 3495 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3496 * Reload frag_tail to have it pointing to the correct place. 3497 */ 3498 if (n == 2) 3499 frag_tail = &skb_shinfo(head)->frag_list; 3500 3501 /* 3502 * Pad out the previous subframe to a multiple of 4 by adding the 3503 * padding to the next one, that's being added. Note that head->len 3504 * is the length of the full A-MSDU, but that works since each time 3505 * we add a new subframe we pad out the previous one to a multiple 3506 * of 4 and thus it no longer matters in the next round. 3507 */ 3508 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3509 if ((head->len - hdrlen) & 3) 3510 pad = 4 - ((head->len - hdrlen) & 3); 3511 3512 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3513 2 + pad)) 3514 goto out_recalc; 3515 3516 ret = true; 3517 data = skb_push(skb, ETH_ALEN + 2); 3518 ether_addr_copy(data, da); 3519 ether_addr_copy(data + ETH_ALEN, sa); 3520 3521 data += 2 * ETH_ALEN; 3522 len = cpu_to_be16(subframe_len); 3523 memcpy(data, &len, 2); 3524 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3525 3526 memset(skb_push(skb, pad), 0, pad); 3527 3528 head->len += skb->len; 3529 head->data_len += skb->len; 3530 *frag_tail = skb; 3531 3532 out_recalc: 3533 fq->memory_usage += head->truesize - orig_truesize; 3534 if (head->len != orig_len) { 3535 flow->backlog += head->len - orig_len; 3536 tin->backlog_bytes += head->len - orig_len; 3537 } 3538 out: 3539 spin_unlock_bh(&fq->lock); 3540 3541 return ret; 3542 } 3543 3544 /* 3545 * Can be called while the sta lock is held. Anything that can cause packets to 3546 * be generated will cause deadlock! 3547 */ 3548 static ieee80211_tx_result 3549 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3550 struct sta_info *sta, u8 pn_offs, 3551 struct ieee80211_key *key, 3552 struct ieee80211_tx_data *tx) 3553 { 3554 struct sk_buff *skb = tx->skb; 3555 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3556 struct ieee80211_hdr *hdr = (void *)skb->data; 3557 u8 tid = IEEE80211_NUM_TIDS; 3558 3559 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3560 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3561 return TX_DROP; 3562 3563 if (key) 3564 info->control.hw_key = &key->conf; 3565 3566 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3567 3568 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3569 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3570 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3571 } else { 3572 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3573 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3574 sdata->sequence_number += 0x10; 3575 } 3576 3577 if (skb_shinfo(skb)->gso_size) 3578 sta->deflink.tx_stats.msdu[tid] += 3579 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3580 else 3581 sta->deflink.tx_stats.msdu[tid]++; 3582 3583 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3584 3585 /* statistics normally done by ieee80211_tx_h_stats (but that 3586 * has to consider fragmentation, so is more complex) 3587 */ 3588 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3589 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3590 3591 if (pn_offs) { 3592 u64 pn; 3593 u8 *crypto_hdr = skb->data + pn_offs; 3594 3595 switch (key->conf.cipher) { 3596 case WLAN_CIPHER_SUITE_CCMP: 3597 case WLAN_CIPHER_SUITE_CCMP_256: 3598 case WLAN_CIPHER_SUITE_GCMP: 3599 case WLAN_CIPHER_SUITE_GCMP_256: 3600 pn = atomic64_inc_return(&key->conf.tx_pn); 3601 crypto_hdr[0] = pn; 3602 crypto_hdr[1] = pn >> 8; 3603 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3604 crypto_hdr[4] = pn >> 16; 3605 crypto_hdr[5] = pn >> 24; 3606 crypto_hdr[6] = pn >> 32; 3607 crypto_hdr[7] = pn >> 40; 3608 break; 3609 } 3610 } 3611 3612 return TX_CONTINUE; 3613 } 3614 3615 static netdev_features_t 3616 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3617 { 3618 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3619 return sdata->vif.netdev_features; 3620 3621 if (!sdata->bss) 3622 return 0; 3623 3624 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3625 return sdata->vif.netdev_features; 3626 } 3627 3628 static struct sk_buff * 3629 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3630 { 3631 if (skb_is_gso(skb)) { 3632 struct sk_buff *segs; 3633 3634 segs = skb_gso_segment(skb, features); 3635 if (!segs) 3636 return skb; 3637 if (IS_ERR(segs)) 3638 goto free; 3639 3640 consume_skb(skb); 3641 return segs; 3642 } 3643 3644 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3645 goto free; 3646 3647 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3648 int ofs = skb_checksum_start_offset(skb); 3649 3650 if (skb->encapsulation) 3651 skb_set_inner_transport_header(skb, ofs); 3652 else 3653 skb_set_transport_header(skb, ofs); 3654 3655 if (skb_csum_hwoffload_help(skb, features)) 3656 goto free; 3657 } 3658 3659 skb_mark_not_on_list(skb); 3660 return skb; 3661 3662 free: 3663 kfree_skb(skb); 3664 return NULL; 3665 } 3666 3667 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3668 struct sta_info *sta, 3669 struct ieee80211_fast_tx *fast_tx, 3670 struct sk_buff *skb, bool ampdu, 3671 const u8 *da, const u8 *sa) 3672 { 3673 struct ieee80211_local *local = sdata->local; 3674 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3675 struct ieee80211_tx_info *info; 3676 struct ieee80211_tx_data tx; 3677 ieee80211_tx_result r; 3678 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3679 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3680 3681 skb = skb_share_check(skb, GFP_ATOMIC); 3682 if (unlikely(!skb)) 3683 return; 3684 3685 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3686 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3687 return; 3688 3689 /* will not be crypto-handled beyond what we do here, so use false 3690 * as the may-encrypt argument for the resize to not account for 3691 * more room than we already have in 'extra_head' 3692 */ 3693 if (unlikely(ieee80211_skb_resize(sdata, skb, 3694 max_t(int, extra_head + hw_headroom - 3695 skb_headroom(skb), 0), 3696 ENCRYPT_NO))) 3697 goto free; 3698 3699 hdr = skb_push(skb, extra_head); 3700 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3701 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3702 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3703 3704 info = IEEE80211_SKB_CB(skb); 3705 memset(info, 0, sizeof(*info)); 3706 info->band = fast_tx->band; 3707 info->control.vif = &sdata->vif; 3708 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3709 IEEE80211_TX_CTL_DONTFRAG; 3710 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3711 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3712 IEEE80211_TX_CTRL_MLO_LINK); 3713 3714 #ifdef CONFIG_MAC80211_DEBUGFS 3715 if (local->force_tx_status) 3716 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3717 #endif 3718 3719 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3720 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3721 3722 *ieee80211_get_qos_ctl(hdr) = tid; 3723 } 3724 3725 __skb_queue_head_init(&tx.skbs); 3726 3727 tx.flags = IEEE80211_TX_UNICAST; 3728 tx.local = local; 3729 tx.sdata = sdata; 3730 tx.sta = sta; 3731 tx.key = fast_tx->key; 3732 3733 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3734 return; 3735 3736 tx.skb = skb; 3737 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3738 fast_tx->key, &tx); 3739 tx.skb = NULL; 3740 if (r == TX_DROP) { 3741 tx.sdata->tx_handlers_drop++; 3742 goto free; 3743 } 3744 3745 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3746 sdata = container_of(sdata->bss, 3747 struct ieee80211_sub_if_data, u.ap); 3748 3749 __skb_queue_tail(&tx.skbs, skb); 3750 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3751 return; 3752 3753 free: 3754 kfree_skb(skb); 3755 } 3756 3757 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3758 struct sta_info *sta, 3759 struct ieee80211_fast_tx *fast_tx, 3760 struct sk_buff *skb) 3761 { 3762 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3763 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3764 struct tid_ampdu_tx *tid_tx = NULL; 3765 struct sk_buff *next; 3766 struct ethhdr eth; 3767 u8 tid = IEEE80211_NUM_TIDS; 3768 3769 /* control port protocol needs a lot of special handling */ 3770 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3771 return false; 3772 3773 /* only RFC 1042 SNAP */ 3774 if (ethertype < ETH_P_802_3_MIN) 3775 return false; 3776 3777 /* don't handle TX status request here either */ 3778 if (sk_requests_wifi_status(skb->sk)) 3779 return false; 3780 3781 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3782 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3783 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3784 if (tid_tx) { 3785 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3786 return false; 3787 if (tid_tx->timeout) 3788 tid_tx->last_tx = jiffies; 3789 } 3790 } 3791 3792 memcpy(ð, skb->data, ETH_HLEN - 2); 3793 3794 /* after this point (skb is modified) we cannot return false */ 3795 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3796 if (!skb) 3797 return true; 3798 3799 skb_list_walk_safe(skb, skb, next) { 3800 skb_mark_not_on_list(skb); 3801 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3802 eth.h_dest, eth.h_source); 3803 } 3804 3805 return true; 3806 } 3807 3808 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3809 struct ieee80211_txq *txq) 3810 { 3811 struct ieee80211_local *local = hw_to_local(hw); 3812 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3813 struct ieee80211_hdr *hdr; 3814 struct sk_buff *skb = NULL; 3815 struct fq *fq = &local->fq; 3816 struct fq_tin *tin = &txqi->tin; 3817 struct ieee80211_tx_info *info; 3818 struct ieee80211_tx_data tx; 3819 ieee80211_tx_result r; 3820 struct ieee80211_vif *vif = txq->vif; 3821 int q = vif->hw_queue[txq->ac]; 3822 unsigned long flags; 3823 bool q_stopped; 3824 3825 WARN_ON_ONCE(softirq_count() == 0); 3826 3827 if (!ieee80211_txq_airtime_check(hw, txq)) 3828 return NULL; 3829 3830 begin: 3831 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3832 q_stopped = local->queue_stop_reasons[q]; 3833 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3834 3835 if (unlikely(q_stopped)) { 3836 /* mark for waking later */ 3837 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3838 return NULL; 3839 } 3840 3841 spin_lock_bh(&fq->lock); 3842 3843 /* Make sure fragments stay together. */ 3844 skb = __skb_dequeue(&txqi->frags); 3845 if (unlikely(skb)) { 3846 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3847 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3848 goto out; 3849 IEEE80211_SKB_CB(skb)->control.flags &= 3850 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3851 } else { 3852 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3853 goto out; 3854 3855 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3856 } 3857 3858 if (!skb) 3859 goto out; 3860 3861 spin_unlock_bh(&fq->lock); 3862 3863 hdr = (struct ieee80211_hdr *)skb->data; 3864 info = IEEE80211_SKB_CB(skb); 3865 3866 memset(&tx, 0, sizeof(tx)); 3867 __skb_queue_head_init(&tx.skbs); 3868 tx.local = local; 3869 tx.skb = skb; 3870 tx.sdata = vif_to_sdata(info->control.vif); 3871 3872 if (txq->sta) { 3873 tx.sta = container_of(txq->sta, struct sta_info, sta); 3874 /* 3875 * Drop unicast frames to unauthorised stations unless they are 3876 * injected frames or EAPOL frames from the local station. 3877 */ 3878 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3879 ieee80211_is_data(hdr->frame_control) && 3880 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3881 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3882 !is_multicast_ether_addr(hdr->addr1) && 3883 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3884 (!(info->control.flags & 3885 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3886 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3887 NULL)))) { 3888 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3889 ieee80211_free_txskb(&local->hw, skb); 3890 goto begin; 3891 } 3892 } 3893 3894 /* 3895 * The key can be removed while the packet was queued, so need to call 3896 * this here to get the current key. 3897 */ 3898 info->control.hw_key = NULL; 3899 r = ieee80211_tx_h_select_key(&tx); 3900 if (r != TX_CONTINUE) { 3901 ieee80211_free_txskb(&local->hw, skb); 3902 goto begin; 3903 } 3904 3905 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3906 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3907 IEEE80211_TX_CTL_DONTFRAG); 3908 3909 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3910 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3911 r = ieee80211_tx_h_rate_ctrl(&tx); 3912 if (r != TX_CONTINUE) { 3913 ieee80211_free_txskb(&local->hw, skb); 3914 goto begin; 3915 } 3916 } 3917 goto encap_out; 3918 } 3919 3920 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3921 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3922 sta); 3923 u8 pn_offs = 0; 3924 3925 if (tx.key && 3926 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3927 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3928 3929 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3930 tx.key, &tx); 3931 if (r != TX_CONTINUE) { 3932 ieee80211_free_txskb(&local->hw, skb); 3933 goto begin; 3934 } 3935 } else { 3936 if (invoke_tx_handlers_late(&tx)) 3937 goto begin; 3938 3939 skb = __skb_dequeue(&tx.skbs); 3940 info = IEEE80211_SKB_CB(skb); 3941 3942 if (!skb_queue_empty(&tx.skbs)) { 3943 spin_lock_bh(&fq->lock); 3944 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3945 spin_unlock_bh(&fq->lock); 3946 } 3947 } 3948 3949 if (skb_has_frag_list(skb) && 3950 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3951 if (skb_linearize(skb)) { 3952 ieee80211_free_txskb(&local->hw, skb); 3953 goto begin; 3954 } 3955 } 3956 3957 switch (tx.sdata->vif.type) { 3958 case NL80211_IFTYPE_MONITOR: 3959 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 3960 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 3961 vif = &tx.sdata->vif; 3962 break; 3963 } 3964 tx.sdata = rcu_dereference(local->monitor_sdata); 3965 if (tx.sdata && 3966 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 3967 vif = &tx.sdata->vif; 3968 info->hw_queue = 3969 vif->hw_queue[skb_get_queue_mapping(skb)]; 3970 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3971 ieee80211_free_txskb(&local->hw, skb); 3972 goto begin; 3973 } else { 3974 info->control.vif = NULL; 3975 return skb; 3976 } 3977 break; 3978 case NL80211_IFTYPE_AP_VLAN: 3979 tx.sdata = container_of(tx.sdata->bss, 3980 struct ieee80211_sub_if_data, u.ap); 3981 fallthrough; 3982 default: 3983 vif = &tx.sdata->vif; 3984 break; 3985 } 3986 3987 encap_out: 3988 info->control.vif = vif; 3989 3990 if (tx.sta && 3991 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3992 bool ampdu = txq->ac != IEEE80211_AC_VO; 3993 u32 airtime; 3994 3995 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3996 skb->len, ampdu); 3997 if (airtime) { 3998 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3999 ieee80211_sta_update_pending_airtime(local, tx.sta, 4000 txq->ac, 4001 airtime, 4002 false); 4003 } 4004 } 4005 4006 return skb; 4007 4008 out: 4009 spin_unlock_bh(&fq->lock); 4010 4011 return skb; 4012 } 4013 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4014 4015 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4016 { 4017 struct airtime_info *air_info = &sta->airtime[ac]; 4018 4019 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4020 } 4021 4022 static void 4023 ieee80211_txq_set_active(struct txq_info *txqi) 4024 { 4025 struct sta_info *sta; 4026 4027 if (!txqi->txq.sta) 4028 return; 4029 4030 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4031 sta->airtime[txqi->txq.ac].last_active = jiffies; 4032 } 4033 4034 static bool 4035 ieee80211_txq_keep_active(struct txq_info *txqi) 4036 { 4037 struct sta_info *sta; 4038 4039 if (!txqi->txq.sta) 4040 return false; 4041 4042 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4043 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4044 return false; 4045 4046 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4047 } 4048 4049 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4050 { 4051 struct ieee80211_local *local = hw_to_local(hw); 4052 struct ieee80211_txq *ret = NULL; 4053 struct txq_info *txqi = NULL, *head = NULL; 4054 bool found_eligible_txq = false; 4055 4056 spin_lock_bh(&local->active_txq_lock[ac]); 4057 4058 if (!local->schedule_round[ac]) 4059 goto out; 4060 4061 begin: 4062 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4063 struct txq_info, 4064 schedule_order); 4065 if (!txqi) 4066 goto out; 4067 4068 if (txqi == head) { 4069 if (!found_eligible_txq) 4070 goto out; 4071 else 4072 found_eligible_txq = false; 4073 } 4074 4075 if (!head) 4076 head = txqi; 4077 4078 if (txqi->txq.sta) { 4079 struct sta_info *sta = container_of(txqi->txq.sta, 4080 struct sta_info, sta); 4081 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4082 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4083 4084 if (aql_check) 4085 found_eligible_txq = true; 4086 4087 if (deficit < 0) 4088 sta->airtime[txqi->txq.ac].deficit += 4089 sta->airtime_weight; 4090 4091 if (deficit < 0 || !aql_check) { 4092 list_move_tail(&txqi->schedule_order, 4093 &local->active_txqs[txqi->txq.ac]); 4094 goto begin; 4095 } 4096 } 4097 4098 if (txqi->schedule_round == local->schedule_round[ac]) 4099 goto out; 4100 4101 list_del_init(&txqi->schedule_order); 4102 txqi->schedule_round = local->schedule_round[ac]; 4103 ret = &txqi->txq; 4104 4105 out: 4106 spin_unlock_bh(&local->active_txq_lock[ac]); 4107 return ret; 4108 } 4109 EXPORT_SYMBOL(ieee80211_next_txq); 4110 4111 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4112 struct ieee80211_txq *txq, 4113 bool force) 4114 { 4115 struct ieee80211_local *local = hw_to_local(hw); 4116 struct txq_info *txqi = to_txq_info(txq); 4117 bool has_queue; 4118 4119 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4120 4121 has_queue = force || 4122 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4123 txq_has_queue(txq)); 4124 if (list_empty(&txqi->schedule_order) && 4125 (has_queue || ieee80211_txq_keep_active(txqi))) { 4126 /* If airtime accounting is active, always enqueue STAs at the 4127 * head of the list to ensure that they only get moved to the 4128 * back by the airtime DRR scheduler once they have a negative 4129 * deficit. A station that already has a negative deficit will 4130 * get immediately moved to the back of the list on the next 4131 * call to ieee80211_next_txq(). 4132 */ 4133 if (txqi->txq.sta && local->airtime_flags && has_queue && 4134 wiphy_ext_feature_isset(local->hw.wiphy, 4135 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4136 list_add(&txqi->schedule_order, 4137 &local->active_txqs[txq->ac]); 4138 else 4139 list_add_tail(&txqi->schedule_order, 4140 &local->active_txqs[txq->ac]); 4141 if (has_queue) 4142 ieee80211_txq_set_active(txqi); 4143 } 4144 4145 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4146 } 4147 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4148 4149 DEFINE_STATIC_KEY_FALSE(aql_disable); 4150 4151 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4152 struct ieee80211_txq *txq) 4153 { 4154 struct sta_info *sta; 4155 struct ieee80211_local *local = hw_to_local(hw); 4156 4157 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4158 return true; 4159 4160 if (static_branch_unlikely(&aql_disable)) 4161 return true; 4162 4163 if (!txq->sta) 4164 return true; 4165 4166 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4167 return true; 4168 4169 sta = container_of(txq->sta, struct sta_info, sta); 4170 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4171 sta->airtime[txq->ac].aql_limit_low) 4172 return true; 4173 4174 if (atomic_read(&local->aql_total_pending_airtime) < 4175 local->aql_threshold && 4176 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4177 sta->airtime[txq->ac].aql_limit_high) 4178 return true; 4179 4180 return false; 4181 } 4182 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4183 4184 static bool 4185 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4186 { 4187 unsigned int num_txq = 0; 4188 struct txq_info *txq; 4189 u32 aql_limit; 4190 4191 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4192 return true; 4193 4194 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4195 num_txq++; 4196 4197 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4198 local->aql_txq_limit_high[ac]; 4199 4200 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4201 } 4202 4203 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4204 struct ieee80211_txq *txq) 4205 { 4206 struct ieee80211_local *local = hw_to_local(hw); 4207 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4208 struct sta_info *sta; 4209 u8 ac = txq->ac; 4210 4211 spin_lock_bh(&local->active_txq_lock[ac]); 4212 4213 if (!txqi->txq.sta) 4214 goto out; 4215 4216 if (list_empty(&txqi->schedule_order)) 4217 goto out; 4218 4219 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4220 goto out; 4221 4222 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4223 schedule_order) { 4224 if (iter == txqi) 4225 break; 4226 4227 if (!iter->txq.sta) { 4228 list_move_tail(&iter->schedule_order, 4229 &local->active_txqs[ac]); 4230 continue; 4231 } 4232 sta = container_of(iter->txq.sta, struct sta_info, sta); 4233 if (ieee80211_sta_deficit(sta, ac) < 0) 4234 sta->airtime[ac].deficit += sta->airtime_weight; 4235 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4236 } 4237 4238 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4239 if (sta->airtime[ac].deficit >= 0) 4240 goto out; 4241 4242 sta->airtime[ac].deficit += sta->airtime_weight; 4243 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4244 spin_unlock_bh(&local->active_txq_lock[ac]); 4245 4246 return false; 4247 out: 4248 if (!list_empty(&txqi->schedule_order)) 4249 list_del_init(&txqi->schedule_order); 4250 spin_unlock_bh(&local->active_txq_lock[ac]); 4251 4252 return true; 4253 } 4254 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4255 4256 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4257 { 4258 struct ieee80211_local *local = hw_to_local(hw); 4259 4260 spin_lock_bh(&local->active_txq_lock[ac]); 4261 4262 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4263 local->schedule_round[ac]++; 4264 if (!local->schedule_round[ac]) 4265 local->schedule_round[ac]++; 4266 } else { 4267 local->schedule_round[ac] = 0; 4268 } 4269 4270 spin_unlock_bh(&local->active_txq_lock[ac]); 4271 } 4272 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4273 4274 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4275 struct net_device *dev, 4276 u32 info_flags, 4277 u32 ctrl_flags, 4278 u64 *cookie) 4279 { 4280 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4281 struct ieee80211_local *local = sdata->local; 4282 struct sta_info *sta; 4283 struct sk_buff *next; 4284 int len = skb->len; 4285 4286 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4287 kfree_skb(skb); 4288 return; 4289 } 4290 4291 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4292 4293 rcu_read_lock(); 4294 4295 if (ieee80211_vif_is_mesh(&sdata->vif) && 4296 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4297 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4298 goto out; 4299 4300 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4301 goto out_free; 4302 4303 if (IS_ERR(sta)) 4304 sta = NULL; 4305 4306 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4307 ieee80211_aggr_check(sdata, sta, skb); 4308 4309 if (sta) { 4310 struct ieee80211_fast_tx *fast_tx; 4311 4312 fast_tx = rcu_dereference(sta->fast_tx); 4313 4314 if (fast_tx && 4315 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4316 goto out; 4317 } 4318 4319 /* the frame could be fragmented, software-encrypted, and other 4320 * things so we cannot really handle checksum or GSO offload. 4321 * fix it up in software before we handle anything else. 4322 */ 4323 skb = ieee80211_tx_skb_fixup(skb, 0); 4324 if (!skb) { 4325 len = 0; 4326 goto out; 4327 } 4328 4329 skb_list_walk_safe(skb, skb, next) { 4330 skb_mark_not_on_list(skb); 4331 4332 if (skb->protocol == sdata->control_port_protocol) 4333 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4334 4335 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4336 sta, ctrl_flags, cookie); 4337 if (IS_ERR(skb)) { 4338 kfree_skb_list(next); 4339 goto out; 4340 } 4341 4342 dev_sw_netstats_tx_add(dev, 1, skb->len); 4343 4344 ieee80211_xmit(sdata, sta, skb); 4345 } 4346 goto out; 4347 out_free: 4348 kfree_skb(skb); 4349 len = 0; 4350 out: 4351 if (len) 4352 ieee80211_tpt_led_trig_tx(local, len); 4353 rcu_read_unlock(); 4354 } 4355 4356 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4357 { 4358 struct ethhdr *eth; 4359 int err; 4360 4361 err = skb_ensure_writable(skb, ETH_HLEN); 4362 if (unlikely(err)) 4363 return err; 4364 4365 eth = (void *)skb->data; 4366 ether_addr_copy(eth->h_dest, sta->sta.addr); 4367 4368 return 0; 4369 } 4370 4371 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4372 struct net_device *dev) 4373 { 4374 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4375 const struct ethhdr *eth = (void *)skb->data; 4376 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4377 __be16 ethertype; 4378 4379 switch (sdata->vif.type) { 4380 case NL80211_IFTYPE_AP_VLAN: 4381 if (sdata->u.vlan.sta) 4382 return false; 4383 if (sdata->wdev.use_4addr) 4384 return false; 4385 fallthrough; 4386 case NL80211_IFTYPE_AP: 4387 /* check runtime toggle for this bss */ 4388 if (!sdata->bss->multicast_to_unicast) 4389 return false; 4390 break; 4391 default: 4392 return false; 4393 } 4394 4395 /* multicast to unicast conversion only for some payload */ 4396 ethertype = eth->h_proto; 4397 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4398 ethertype = ethvlan->h_vlan_encapsulated_proto; 4399 switch (ethertype) { 4400 case htons(ETH_P_ARP): 4401 case htons(ETH_P_IP): 4402 case htons(ETH_P_IPV6): 4403 break; 4404 default: 4405 return false; 4406 } 4407 4408 return true; 4409 } 4410 4411 static void 4412 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4413 struct sk_buff_head *queue) 4414 { 4415 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4416 struct ieee80211_local *local = sdata->local; 4417 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4418 struct sta_info *sta, *first = NULL; 4419 struct sk_buff *cloned_skb; 4420 4421 rcu_read_lock(); 4422 4423 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4424 if (sdata != sta->sdata) 4425 /* AP-VLAN mismatch */ 4426 continue; 4427 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4428 /* do not send back to source */ 4429 continue; 4430 if (!first) { 4431 first = sta; 4432 continue; 4433 } 4434 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4435 if (!cloned_skb) 4436 goto multicast; 4437 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4438 dev_kfree_skb(cloned_skb); 4439 goto multicast; 4440 } 4441 __skb_queue_tail(queue, cloned_skb); 4442 } 4443 4444 if (likely(first)) { 4445 if (unlikely(ieee80211_change_da(skb, first))) 4446 goto multicast; 4447 __skb_queue_tail(queue, skb); 4448 } else { 4449 /* no STA connected, drop */ 4450 kfree_skb(skb); 4451 skb = NULL; 4452 } 4453 4454 goto out; 4455 multicast: 4456 __skb_queue_purge(queue); 4457 __skb_queue_tail(queue, skb); 4458 out: 4459 rcu_read_unlock(); 4460 } 4461 4462 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4463 struct sk_buff *skb, u32 ctrl_flags, 4464 unsigned int link_id) 4465 { 4466 struct sk_buff *out; 4467 4468 out = skb_copy(skb, GFP_ATOMIC); 4469 if (!out) 4470 return; 4471 4472 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4473 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4474 } 4475 4476 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4477 struct sk_buff *skb) 4478 { 4479 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4480 unsigned long links = sdata->vif.active_links; 4481 unsigned int link; 4482 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4483 4484 if (hweight16(links) == 1) { 4485 ctrl_flags |= u32_encode_bits(__ffs(links), 4486 IEEE80211_TX_CTRL_MLO_LINK); 4487 4488 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4489 NULL); 4490 return; 4491 } 4492 4493 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4494 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4495 ctrl_flags = 0; 4496 } 4497 kfree_skb(skb); 4498 } 4499 4500 /** 4501 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4502 * @skb: packet to be sent 4503 * @dev: incoming interface 4504 * 4505 * On failure skb will be freed. 4506 * 4507 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4508 */ 4509 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4510 struct net_device *dev) 4511 { 4512 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4513 const struct ethhdr *eth = (void *)skb->data; 4514 4515 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4516 goto normal; 4517 4518 if (unlikely(!ieee80211_sdata_running(sdata))) { 4519 kfree_skb(skb); 4520 return NETDEV_TX_OK; 4521 } 4522 4523 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4524 struct sk_buff_head queue; 4525 4526 __skb_queue_head_init(&queue); 4527 ieee80211_convert_to_unicast(skb, dev, &queue); 4528 while ((skb = __skb_dequeue(&queue))) 4529 __ieee80211_subif_start_xmit(skb, dev, 0, 4530 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4531 NULL); 4532 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4533 ((sdata->vif.type == NL80211_IFTYPE_AP && 4534 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4535 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4536 !sdata->wdev.use_4addr))) { 4537 ieee80211_mlo_multicast_tx(dev, skb); 4538 } else { 4539 normal: 4540 __ieee80211_subif_start_xmit(skb, dev, 0, 4541 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4542 NULL); 4543 } 4544 4545 return NETDEV_TX_OK; 4546 } 4547 4548 4549 4550 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4551 struct sk_buff *skb, struct sta_info *sta, 4552 bool txpending) 4553 { 4554 struct ieee80211_local *local = sdata->local; 4555 struct ieee80211_tx_control control = {}; 4556 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4557 struct ieee80211_sta *pubsta = NULL; 4558 unsigned long flags; 4559 int q = info->hw_queue; 4560 4561 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4562 4563 if (local->queue_stop_reasons[q] || 4564 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4565 if (txpending) 4566 skb_queue_head(&local->pending[q], skb); 4567 else 4568 skb_queue_tail(&local->pending[q], skb); 4569 4570 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4571 4572 return false; 4573 } 4574 4575 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4576 4577 if (sta && sta->uploaded) 4578 pubsta = &sta->sta; 4579 4580 control.sta = pubsta; 4581 4582 drv_tx(local, &control, skb); 4583 4584 return true; 4585 } 4586 4587 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4588 struct sk_buff *skb, struct sta_info *sta, 4589 bool txpending) 4590 { 4591 struct ieee80211_local *local = sdata->local; 4592 struct sk_buff *next; 4593 bool ret = true; 4594 4595 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4596 return true; 4597 4598 skb_list_walk_safe(skb, skb, next) { 4599 skb_mark_not_on_list(skb); 4600 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4601 ret = false; 4602 } 4603 4604 return ret; 4605 } 4606 4607 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4608 struct net_device *dev, struct sta_info *sta, 4609 struct ieee80211_key *key, struct sk_buff *skb) 4610 { 4611 struct ieee80211_tx_info *info; 4612 struct ieee80211_local *local = sdata->local; 4613 struct tid_ampdu_tx *tid_tx; 4614 struct sk_buff *seg, *next; 4615 unsigned int skbs = 0, len = 0; 4616 u16 queue; 4617 u8 tid; 4618 4619 queue = ieee80211_select_queue(sdata, sta, skb); 4620 skb_set_queue_mapping(skb, queue); 4621 4622 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4623 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4624 goto out_free; 4625 4626 skb = skb_share_check(skb, GFP_ATOMIC); 4627 if (unlikely(!skb)) 4628 return; 4629 4630 ieee80211_aggr_check(sdata, sta, skb); 4631 4632 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4633 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4634 if (tid_tx) { 4635 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4636 /* fall back to non-offload slow path */ 4637 __ieee80211_subif_start_xmit(skb, dev, 0, 4638 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4639 NULL); 4640 return; 4641 } 4642 4643 if (tid_tx->timeout) 4644 tid_tx->last_tx = jiffies; 4645 } 4646 4647 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4648 if (!skb) 4649 return; 4650 4651 info = IEEE80211_SKB_CB(skb); 4652 memset(info, 0, sizeof(*info)); 4653 4654 info->hw_queue = sdata->vif.hw_queue[queue]; 4655 4656 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4657 sdata = container_of(sdata->bss, 4658 struct ieee80211_sub_if_data, u.ap); 4659 4660 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4661 info->control.vif = &sdata->vif; 4662 4663 if (key) 4664 info->control.hw_key = &key->conf; 4665 4666 skb_list_walk_safe(skb, seg, next) { 4667 skbs++; 4668 len += seg->len; 4669 if (seg != skb) 4670 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4671 } 4672 4673 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4674 info->status_data = ieee80211_store_ack_skb(local, skb, 4675 &info->flags, NULL); 4676 if (info->status_data) 4677 info->status_data_idr = 1; 4678 } 4679 4680 dev_sw_netstats_tx_add(dev, skbs, len); 4681 sta->deflink.tx_stats.packets[queue] += skbs; 4682 sta->deflink.tx_stats.bytes[queue] += len; 4683 4684 ieee80211_tpt_led_trig_tx(local, len); 4685 4686 ieee80211_tx_8023(sdata, skb, sta, false); 4687 4688 return; 4689 4690 out_free: 4691 kfree_skb(skb); 4692 } 4693 4694 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4695 struct net_device *dev) 4696 { 4697 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4698 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4699 struct ieee80211_key *key; 4700 struct sta_info *sta; 4701 4702 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4703 kfree_skb(skb); 4704 return NETDEV_TX_OK; 4705 } 4706 4707 rcu_read_lock(); 4708 4709 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4710 kfree_skb(skb); 4711 goto out; 4712 } 4713 4714 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4715 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4716 sdata->control_port_protocol == ehdr->h_proto)) 4717 goto skip_offload; 4718 4719 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4720 if (!key) 4721 key = rcu_dereference(sdata->default_unicast_key); 4722 4723 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4724 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4725 goto skip_offload; 4726 4727 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4728 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4729 goto out; 4730 4731 skip_offload: 4732 ieee80211_subif_start_xmit(skb, dev); 4733 out: 4734 rcu_read_unlock(); 4735 4736 return NETDEV_TX_OK; 4737 } 4738 4739 struct sk_buff * 4740 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4741 struct sk_buff *skb, u32 info_flags) 4742 { 4743 struct ieee80211_hdr *hdr; 4744 struct ieee80211_tx_data tx = { 4745 .local = sdata->local, 4746 .sdata = sdata, 4747 }; 4748 struct sta_info *sta; 4749 4750 rcu_read_lock(); 4751 4752 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4753 kfree_skb(skb); 4754 skb = ERR_PTR(-EINVAL); 4755 goto out; 4756 } 4757 4758 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4759 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4760 if (IS_ERR(skb)) 4761 goto out; 4762 4763 hdr = (void *)skb->data; 4764 tx.sta = sta_info_get(sdata, hdr->addr1); 4765 tx.skb = skb; 4766 4767 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4768 rcu_read_unlock(); 4769 kfree_skb(skb); 4770 return ERR_PTR(-EINVAL); 4771 } 4772 4773 out: 4774 rcu_read_unlock(); 4775 return skb; 4776 } 4777 4778 /* 4779 * ieee80211_clear_tx_pending may not be called in a context where 4780 * it is possible that it packets could come in again. 4781 */ 4782 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4783 { 4784 struct sk_buff *skb; 4785 int i; 4786 4787 for (i = 0; i < local->hw.queues; i++) { 4788 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4789 ieee80211_free_txskb(&local->hw, skb); 4790 } 4791 } 4792 4793 /* 4794 * Returns false if the frame couldn't be transmitted but was queued instead, 4795 * which in this case means re-queued -- take as an indication to stop sending 4796 * more pending frames. 4797 */ 4798 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4799 struct sk_buff *skb) 4800 { 4801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4802 struct ieee80211_sub_if_data *sdata; 4803 struct sta_info *sta; 4804 struct ieee80211_hdr *hdr; 4805 bool result; 4806 struct ieee80211_chanctx_conf *chanctx_conf; 4807 4808 sdata = vif_to_sdata(info->control.vif); 4809 4810 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4811 /* update band only for non-MLD */ 4812 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4813 chanctx_conf = 4814 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4815 if (unlikely(!chanctx_conf)) { 4816 dev_kfree_skb(skb); 4817 return true; 4818 } 4819 info->band = chanctx_conf->def.chan->band; 4820 } 4821 result = ieee80211_tx(sdata, NULL, skb, true); 4822 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4823 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4824 dev_kfree_skb(skb); 4825 return true; 4826 } 4827 4828 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4829 sta = NULL; 4830 4831 result = ieee80211_tx_8023(sdata, skb, sta, true); 4832 } else { 4833 struct sk_buff_head skbs; 4834 4835 __skb_queue_head_init(&skbs); 4836 __skb_queue_tail(&skbs, skb); 4837 4838 hdr = (struct ieee80211_hdr *)skb->data; 4839 sta = sta_info_get(sdata, hdr->addr1); 4840 4841 result = __ieee80211_tx(local, &skbs, sta, true); 4842 } 4843 4844 return result; 4845 } 4846 4847 /* 4848 * Transmit all pending packets. Called from tasklet. 4849 */ 4850 void ieee80211_tx_pending(struct tasklet_struct *t) 4851 { 4852 struct ieee80211_local *local = from_tasklet(local, t, 4853 tx_pending_tasklet); 4854 unsigned long flags; 4855 int i; 4856 bool txok; 4857 4858 rcu_read_lock(); 4859 4860 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4861 for (i = 0; i < local->hw.queues; i++) { 4862 /* 4863 * If queue is stopped by something other than due to pending 4864 * frames, or we have no pending frames, proceed to next queue. 4865 */ 4866 if (local->queue_stop_reasons[i] || 4867 skb_queue_empty(&local->pending[i])) 4868 continue; 4869 4870 while (!skb_queue_empty(&local->pending[i])) { 4871 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4872 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4873 4874 if (WARN_ON(!info->control.vif)) { 4875 ieee80211_free_txskb(&local->hw, skb); 4876 continue; 4877 } 4878 4879 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4880 flags); 4881 4882 txok = ieee80211_tx_pending_skb(local, skb); 4883 spin_lock_irqsave(&local->queue_stop_reason_lock, 4884 flags); 4885 if (!txok) 4886 break; 4887 } 4888 } 4889 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4890 4891 rcu_read_unlock(); 4892 } 4893 4894 /* functions for drivers to get certain frames */ 4895 4896 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 4897 struct sk_buff *skb, 4898 bool mcast_traffic) 4899 { 4900 int i, n1 = 0, n2; 4901 4902 /* 4903 * Find largest even number N1 so that bits numbered 1 through 4904 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4905 * (N2 + 1) x 8 through 2007 are 0. 4906 */ 4907 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4908 if (ps->tim[i]) { 4909 n1 = i & 0xfe; 4910 break; 4911 } 4912 } 4913 n2 = n1; 4914 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4915 if (ps->tim[i]) { 4916 n2 = i; 4917 break; 4918 } 4919 } 4920 4921 /* Bitmap control */ 4922 skb_put_u8(skb, n1 | mcast_traffic); 4923 /* Part Virt Bitmap */ 4924 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4925 } 4926 4927 /* 4928 * mac80211 currently supports encoding using block bitmap mode, non 4929 * inversed. The current implementation supports up to 1600 AIDs. 4930 * 4931 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 4932 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 4933 * describes 8 AIDs and the presence of a subblock is determined by 4934 * the block bitmap. 4935 */ 4936 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 4937 struct sk_buff *skb, 4938 bool mcast_traffic) 4939 { 4940 int blk; 4941 4942 /* 4943 * Emit a bitmap control block with a page slice number of 31 and a 4944 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 4945 * that the entire page (2048 bits) indicated by the page index 4946 * is encoded in the partial virtual bitmap. 4947 */ 4948 skb_put_u8(skb, mcast_traffic | (31 << 1)); 4949 4950 /* Emit an encoded block for each non-zero sub-block */ 4951 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 4952 u8 blk_bmap = 0; 4953 int sblk; 4954 4955 for (sblk = 0; sblk < 8; sblk++) { 4956 int sblk_idx = blk * 8 + sblk; 4957 4958 /* 4959 * If the current subblock is non-zero, increase the 4960 * number of subblocks to emit for the current block. 4961 */ 4962 if (ps->tim[sblk_idx]) 4963 blk_bmap |= BIT(sblk); 4964 } 4965 4966 /* If the current block contains no non-zero sublocks */ 4967 if (!blk_bmap) 4968 continue; 4969 4970 /* 4971 * Emit a block control byte for the current encoded block 4972 * with an encoding mode of block bitmap (0x0), not inverse 4973 * (0x0) and the current block offset (5 bits) 4974 */ 4975 skb_put_u8(skb, blk << 3); 4976 4977 /* 4978 * Emit the block bitmap for the current encoded block which 4979 * contains the present subblocks. 4980 */ 4981 skb_put_u8(skb, blk_bmap); 4982 4983 /* Emit the present subblocks */ 4984 for (sblk = 0; sblk < 8; sblk++) { 4985 int sblk_idx = blk * 8 + sblk; 4986 4987 if (!(blk_bmap & BIT(sblk))) 4988 continue; 4989 4990 skb_put_u8(skb, ps->tim[sblk_idx]); 4991 } 4992 } 4993 } 4994 4995 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4996 struct ieee80211_link_data *link, 4997 struct ps_data *ps, struct sk_buff *skb, 4998 bool is_template) 4999 { 5000 struct element *tim; 5001 bool mcast_traffic = false, have_bits = false; 5002 struct ieee80211_bss_conf *link_conf = link->conf; 5003 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5004 5005 /* Generate bitmap for TIM only if there are any STAs in power save 5006 * mode. */ 5007 if (atomic_read(&ps->num_sta_ps) > 0) 5008 /* in the hope that this is faster than 5009 * checking byte-for-byte */ 5010 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5011 IEEE80211_MAX_AID + 1); 5012 5013 if (!is_template) { 5014 if (ps->dtim_count == 0) 5015 ps->dtim_count = link_conf->dtim_period - 1; 5016 else 5017 ps->dtim_count--; 5018 } 5019 5020 /* Length is set after parsing the AID bitmap */ 5021 tim = skb_put(skb, sizeof(struct element)); 5022 tim->id = WLAN_EID_TIM; 5023 skb_put_u8(skb, ps->dtim_count); 5024 skb_put_u8(skb, link_conf->dtim_period); 5025 5026 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5027 mcast_traffic = true; 5028 5029 ps->dtim_bc_mc = mcast_traffic; 5030 5031 if (have_bits) { 5032 if (s1g) 5033 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, 5034 mcast_traffic); 5035 else 5036 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5037 } else { 5038 /* 5039 * If there is no buffered unicast traffic for an S1G 5040 * interface, we can exclude the bitmap control. This is in 5041 * contrast to other phy types as they do include the bitmap 5042 * control and pvb even when there is no buffered traffic. 5043 */ 5044 if (!s1g) { 5045 /* Bitmap control */ 5046 skb_put_u8(skb, mcast_traffic); 5047 /* Part Virt Bitmap */ 5048 skb_put_u8(skb, 0); 5049 } 5050 } 5051 5052 tim->datalen = skb_tail_pointer(skb) - tim->data; 5053 } 5054 5055 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5056 struct ieee80211_link_data *link, 5057 struct ps_data *ps, struct sk_buff *skb, 5058 bool is_template) 5059 { 5060 struct ieee80211_local *local = sdata->local; 5061 5062 /* 5063 * Not very nice, but we want to allow the driver to call 5064 * ieee80211_beacon_get() as a response to the set_tim() 5065 * callback. That, however, is already invoked under the 5066 * sta_lock to guarantee consistent and race-free update 5067 * of the tim bitmap in mac80211 and the driver. 5068 */ 5069 if (local->tim_in_locked_section) { 5070 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5071 } else { 5072 spin_lock_bh(&local->tim_lock); 5073 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5074 spin_unlock_bh(&local->tim_lock); 5075 } 5076 5077 return 0; 5078 } 5079 5080 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5081 struct beacon_data *beacon, 5082 struct ieee80211_link_data *link) 5083 { 5084 u8 *beacon_data, count, max_count = 1; 5085 struct probe_resp *resp; 5086 size_t beacon_data_len; 5087 u16 *bcn_offsets; 5088 int i; 5089 5090 switch (sdata->vif.type) { 5091 case NL80211_IFTYPE_AP: 5092 beacon_data = beacon->tail; 5093 beacon_data_len = beacon->tail_len; 5094 break; 5095 case NL80211_IFTYPE_ADHOC: 5096 beacon_data = beacon->head; 5097 beacon_data_len = beacon->head_len; 5098 break; 5099 case NL80211_IFTYPE_MESH_POINT: 5100 beacon_data = beacon->head; 5101 beacon_data_len = beacon->head_len; 5102 break; 5103 default: 5104 return; 5105 } 5106 5107 resp = rcu_dereference(link->u.ap.probe_resp); 5108 5109 bcn_offsets = beacon->cntdwn_counter_offsets; 5110 count = beacon->cntdwn_current_counter; 5111 if (link->conf->csa_active) 5112 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5113 5114 for (i = 0; i < max_count; ++i) { 5115 if (bcn_offsets[i]) { 5116 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5117 return; 5118 beacon_data[bcn_offsets[i]] = count; 5119 } 5120 5121 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5122 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5123 5124 resp->data[resp_offsets[i]] = count; 5125 } 5126 } 5127 } 5128 5129 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5130 struct beacon_data *beacon) 5131 { 5132 if (beacon->cntdwn_current_counter == 1) { 5133 /* 5134 * Channel switch handling is done by a worker thread while 5135 * beacons get pulled from hardware timers. It's therefore 5136 * possible that software threads are slow enough to not be 5137 * able to complete CSA handling in a single beacon interval, 5138 * in which case we get here. There isn't much to do about 5139 * it, other than letting the user know that the AP isn't 5140 * behaving correctly. 5141 */ 5142 link_err_once(link, 5143 "beacon TX faster than countdown (channel/color switch) completion\n"); 5144 return 0; 5145 } 5146 5147 beacon->cntdwn_current_counter--; 5148 5149 return beacon->cntdwn_current_counter; 5150 } 5151 5152 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5153 { 5154 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5155 struct ieee80211_link_data *link; 5156 struct beacon_data *beacon = NULL; 5157 u8 count = 0; 5158 5159 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5160 return 0; 5161 5162 rcu_read_lock(); 5163 5164 link = rcu_dereference(sdata->link[link_id]); 5165 if (!link) 5166 goto unlock; 5167 5168 if (sdata->vif.type == NL80211_IFTYPE_AP) 5169 beacon = rcu_dereference(link->u.ap.beacon); 5170 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5171 beacon = rcu_dereference(sdata->u.ibss.presp); 5172 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5173 beacon = rcu_dereference(sdata->u.mesh.beacon); 5174 5175 if (!beacon) 5176 goto unlock; 5177 5178 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5179 5180 unlock: 5181 rcu_read_unlock(); 5182 return count; 5183 } 5184 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5185 5186 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5187 { 5188 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5189 struct beacon_data *beacon = NULL; 5190 5191 rcu_read_lock(); 5192 5193 if (sdata->vif.type == NL80211_IFTYPE_AP) 5194 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5195 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5196 beacon = rcu_dereference(sdata->u.ibss.presp); 5197 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5198 beacon = rcu_dereference(sdata->u.mesh.beacon); 5199 5200 if (!beacon) 5201 goto unlock; 5202 5203 if (counter < beacon->cntdwn_current_counter) 5204 beacon->cntdwn_current_counter = counter; 5205 5206 unlock: 5207 rcu_read_unlock(); 5208 } 5209 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5210 5211 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5212 unsigned int link_id) 5213 { 5214 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5215 struct ieee80211_link_data *link; 5216 struct beacon_data *beacon = NULL; 5217 u8 *beacon_data; 5218 size_t beacon_data_len; 5219 int ret = false; 5220 5221 if (!ieee80211_sdata_running(sdata)) 5222 return false; 5223 5224 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5225 return 0; 5226 5227 rcu_read_lock(); 5228 5229 link = rcu_dereference(sdata->link[link_id]); 5230 if (!link) 5231 goto out; 5232 5233 if (vif->type == NL80211_IFTYPE_AP) { 5234 beacon = rcu_dereference(link->u.ap.beacon); 5235 if (WARN_ON(!beacon || !beacon->tail)) 5236 goto out; 5237 beacon_data = beacon->tail; 5238 beacon_data_len = beacon->tail_len; 5239 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5240 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5241 5242 beacon = rcu_dereference(ifibss->presp); 5243 if (!beacon) 5244 goto out; 5245 5246 beacon_data = beacon->head; 5247 beacon_data_len = beacon->head_len; 5248 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5249 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5250 5251 beacon = rcu_dereference(ifmsh->beacon); 5252 if (!beacon) 5253 goto out; 5254 5255 beacon_data = beacon->head; 5256 beacon_data_len = beacon->head_len; 5257 } else { 5258 WARN_ON(1); 5259 goto out; 5260 } 5261 5262 if (!beacon->cntdwn_counter_offsets[0]) 5263 goto out; 5264 5265 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5266 goto out; 5267 5268 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5269 ret = true; 5270 5271 out: 5272 rcu_read_unlock(); 5273 5274 return ret; 5275 } 5276 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5277 5278 static int ieee80211_beacon_protect(struct sk_buff *skb, 5279 struct ieee80211_local *local, 5280 struct ieee80211_sub_if_data *sdata, 5281 struct ieee80211_link_data *link) 5282 { 5283 ieee80211_tx_result res; 5284 struct ieee80211_tx_data tx; 5285 struct sk_buff *check_skb; 5286 5287 memset(&tx, 0, sizeof(tx)); 5288 tx.key = rcu_dereference(link->default_beacon_key); 5289 if (!tx.key) 5290 return 0; 5291 5292 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5293 tx.key = NULL; 5294 return -EINVAL; 5295 } 5296 5297 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5298 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5299 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5300 5301 tx.local = local; 5302 tx.sdata = sdata; 5303 __skb_queue_head_init(&tx.skbs); 5304 __skb_queue_tail(&tx.skbs, skb); 5305 res = ieee80211_tx_h_encrypt(&tx); 5306 check_skb = __skb_dequeue(&tx.skbs); 5307 /* we may crash after this, but it'd be a bug in crypto */ 5308 WARN_ON(check_skb != skb); 5309 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5310 return -EINVAL; 5311 5312 return 0; 5313 } 5314 5315 static void 5316 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5317 struct ieee80211_vif *vif, 5318 struct ieee80211_link_data *link, 5319 struct ieee80211_mutable_offsets *offs, 5320 struct beacon_data *beacon, 5321 struct sk_buff *skb, 5322 struct ieee80211_chanctx_conf *chanctx_conf, 5323 u16 csa_off_base) 5324 { 5325 struct ieee80211_local *local = hw_to_local(hw); 5326 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5327 struct ieee80211_tx_info *info; 5328 enum nl80211_band band; 5329 struct ieee80211_tx_rate_control txrc; 5330 5331 /* CSA offsets */ 5332 if (offs && beacon) { 5333 u16 i; 5334 5335 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5336 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5337 5338 if (!csa_off) 5339 continue; 5340 5341 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5342 } 5343 } 5344 5345 band = chanctx_conf->def.chan->band; 5346 info = IEEE80211_SKB_CB(skb); 5347 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5348 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5349 info->band = band; 5350 5351 memset(&txrc, 0, sizeof(txrc)); 5352 txrc.hw = hw; 5353 txrc.sband = local->hw.wiphy->bands[band]; 5354 txrc.bss_conf = link->conf; 5355 txrc.skb = skb; 5356 txrc.reported_rate.idx = -1; 5357 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5358 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5359 else 5360 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5361 txrc.bss = true; 5362 rate_control_get_rate(sdata, NULL, &txrc); 5363 5364 info->control.vif = vif; 5365 info->control.flags |= u32_encode_bits(link->link_id, 5366 IEEE80211_TX_CTRL_MLO_LINK); 5367 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5368 IEEE80211_TX_CTL_ASSIGN_SEQ | 5369 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5370 } 5371 5372 static void 5373 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5374 u8 i) 5375 { 5376 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5377 i > beacon->mbssid_ies->cnt) 5378 return; 5379 5380 if (i < beacon->mbssid_ies->cnt) { 5381 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5382 beacon->mbssid_ies->elem[i].len); 5383 5384 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5385 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5386 beacon->rnr_ies->elem[i].len); 5387 5388 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5389 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5390 beacon->rnr_ies->elem[i].len); 5391 } 5392 return; 5393 } 5394 5395 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5396 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5397 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5398 beacon->mbssid_ies->elem[i].len); 5399 } 5400 5401 static struct sk_buff * 5402 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5403 struct ieee80211_vif *vif, 5404 struct ieee80211_link_data *link, 5405 struct ieee80211_mutable_offsets *offs, 5406 bool is_template, 5407 struct beacon_data *beacon, 5408 struct ieee80211_chanctx_conf *chanctx_conf, 5409 u8 ema_index) 5410 { 5411 struct ieee80211_local *local = hw_to_local(hw); 5412 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5413 struct ieee80211_if_ap *ap = &sdata->u.ap; 5414 struct sk_buff *skb = NULL; 5415 u16 csa_off_base = 0; 5416 int mbssid_len; 5417 5418 if (beacon->cntdwn_counter_offsets[0]) { 5419 if (!is_template) 5420 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5421 5422 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5423 } 5424 5425 /* headroom, head length, 5426 * tail length, maximum TIM length and multiple BSSID length 5427 */ 5428 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5429 beacon->rnr_ies, 5430 ema_index); 5431 5432 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5433 beacon->tail_len + 256 + 5434 local->hw.extra_beacon_tailroom + mbssid_len); 5435 if (!skb) 5436 return NULL; 5437 5438 skb_reserve(skb, local->tx_headroom); 5439 skb_put_data(skb, beacon->head, beacon->head_len); 5440 5441 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5442 5443 if (offs) { 5444 offs->tim_offset = beacon->head_len; 5445 offs->tim_length = skb->len - beacon->head_len; 5446 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5447 5448 if (mbssid_len) { 5449 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5450 offs->mbssid_off = skb->len - mbssid_len; 5451 } 5452 5453 /* for AP the csa offsets are from tail */ 5454 csa_off_base = skb->len; 5455 } 5456 5457 if (beacon->tail) 5458 skb_put_data(skb, beacon->tail, beacon->tail_len); 5459 5460 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5461 dev_kfree_skb(skb); 5462 return NULL; 5463 } 5464 5465 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5466 chanctx_conf, csa_off_base); 5467 return skb; 5468 } 5469 5470 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5471 struct ieee80211_link_data *link) 5472 { 5473 struct ps_data *ps = &sdata->u.ap.ps; 5474 5475 if (ps->sb_count == 0) 5476 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5477 else 5478 ps->sb_count--; 5479 5480 return ps->sb_count == 0; 5481 } 5482 5483 static struct sk_buff * 5484 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5485 struct ieee80211_vif *vif, 5486 struct ieee80211_link_data *link, 5487 struct ieee80211_chanctx_conf *chanctx_conf, 5488 struct s1g_short_beacon_data *sb, 5489 bool is_template) 5490 { 5491 struct ieee80211_local *local = hw_to_local(hw); 5492 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5493 struct ieee80211_if_ap *ap = &sdata->u.ap; 5494 struct sk_buff *skb; 5495 5496 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5497 sb->short_tail_len + 256 + 5498 local->hw.extra_beacon_tailroom); 5499 if (!skb) 5500 return NULL; 5501 5502 skb_reserve(skb, local->tx_headroom); 5503 skb_put_data(skb, sb->short_head, sb->short_head_len); 5504 5505 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5506 5507 if (sb->short_tail) 5508 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5509 5510 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5511 chanctx_conf, 0); 5512 return skb; 5513 } 5514 5515 static struct sk_buff * 5516 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5517 struct ieee80211_link_data *link, 5518 struct ieee80211_mutable_offsets *offs, 5519 bool is_template, struct beacon_data *beacon, 5520 struct ieee80211_chanctx_conf *chanctx_conf, 5521 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5522 { 5523 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5524 5525 if (!sdata->vif.cfg.s1g || !s1g_sb || 5526 ieee80211_s1g_need_long_beacon(sdata, link)) 5527 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5528 is_template, beacon, 5529 chanctx_conf, ema_index); 5530 5531 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5532 s1g_sb, is_template); 5533 } 5534 5535 static struct ieee80211_ema_beacons * 5536 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5537 struct ieee80211_vif *vif, 5538 struct ieee80211_link_data *link, 5539 struct ieee80211_mutable_offsets *offs, 5540 bool is_template, struct beacon_data *beacon, 5541 struct ieee80211_chanctx_conf *chanctx_conf) 5542 { 5543 struct ieee80211_ema_beacons *ema = NULL; 5544 5545 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5546 return NULL; 5547 5548 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5549 GFP_ATOMIC); 5550 if (!ema) 5551 return NULL; 5552 5553 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5554 ema->bcn[ema->cnt].skb = 5555 ieee80211_beacon_get_ap(hw, vif, link, 5556 &ema->bcn[ema->cnt].offs, 5557 is_template, beacon, 5558 chanctx_conf, ema->cnt, NULL); 5559 if (!ema->bcn[ema->cnt].skb) 5560 break; 5561 } 5562 5563 if (ema->cnt == beacon->mbssid_ies->cnt) 5564 return ema; 5565 5566 ieee80211_beacon_free_ema_list(ema); 5567 return NULL; 5568 } 5569 5570 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5571 5572 static struct sk_buff * 5573 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5574 struct ieee80211_vif *vif, 5575 struct ieee80211_mutable_offsets *offs, 5576 bool is_template, 5577 unsigned int link_id, 5578 int ema_index, 5579 struct ieee80211_ema_beacons **ema_beacons) 5580 { 5581 struct ieee80211_local *local = hw_to_local(hw); 5582 struct beacon_data *beacon = NULL; 5583 struct sk_buff *skb = NULL; 5584 struct ieee80211_sub_if_data *sdata = NULL; 5585 struct ieee80211_chanctx_conf *chanctx_conf; 5586 struct ieee80211_link_data *link; 5587 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5588 5589 rcu_read_lock(); 5590 5591 sdata = vif_to_sdata(vif); 5592 link = rcu_dereference(sdata->link[link_id]); 5593 if (!link) 5594 goto out; 5595 chanctx_conf = 5596 rcu_dereference(link->conf->chanctx_conf); 5597 5598 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5599 goto out; 5600 5601 if (offs) 5602 memset(offs, 0, sizeof(*offs)); 5603 5604 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5605 beacon = rcu_dereference(link->u.ap.beacon); 5606 if (!beacon) 5607 goto out; 5608 5609 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5610 s1g_short_bcn = 5611 rcu_dereference(link->u.ap.s1g_short_beacon); 5612 if (!s1g_short_bcn) 5613 goto out; 5614 } 5615 5616 if (ema_beacons) { 5617 *ema_beacons = 5618 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5619 offs, 5620 is_template, 5621 beacon, 5622 chanctx_conf); 5623 } else { 5624 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5625 if (ema_index >= beacon->mbssid_ies->cnt) 5626 goto out; /* End of MBSSID elements */ 5627 5628 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5629 ema_index = beacon->mbssid_ies->cnt; 5630 } else { 5631 ema_index = 0; 5632 } 5633 5634 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5635 is_template, beacon, 5636 chanctx_conf, ema_index, 5637 s1g_short_bcn); 5638 } 5639 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5640 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5641 struct ieee80211_hdr *hdr; 5642 5643 beacon = rcu_dereference(ifibss->presp); 5644 if (!beacon) 5645 goto out; 5646 5647 if (beacon->cntdwn_counter_offsets[0]) { 5648 if (!is_template) 5649 __ieee80211_beacon_update_cntdwn(link, beacon); 5650 5651 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5652 } 5653 5654 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5655 local->hw.extra_beacon_tailroom); 5656 if (!skb) 5657 goto out; 5658 skb_reserve(skb, local->tx_headroom); 5659 skb_put_data(skb, beacon->head, beacon->head_len); 5660 5661 hdr = (struct ieee80211_hdr *) skb->data; 5662 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5663 IEEE80211_STYPE_BEACON); 5664 5665 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5666 chanctx_conf, 0); 5667 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5668 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5669 5670 beacon = rcu_dereference(ifmsh->beacon); 5671 if (!beacon) 5672 goto out; 5673 5674 if (beacon->cntdwn_counter_offsets[0]) { 5675 if (!is_template) 5676 /* TODO: For mesh csa_counter is in TU, so 5677 * decrementing it by one isn't correct, but 5678 * for now we leave it consistent with overall 5679 * mac80211's behavior. 5680 */ 5681 __ieee80211_beacon_update_cntdwn(link, beacon); 5682 5683 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5684 } 5685 5686 if (ifmsh->sync_ops) 5687 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5688 5689 skb = dev_alloc_skb(local->tx_headroom + 5690 beacon->head_len + 5691 256 + /* TIM IE */ 5692 beacon->tail_len + 5693 local->hw.extra_beacon_tailroom); 5694 if (!skb) 5695 goto out; 5696 skb_reserve(skb, local->tx_headroom); 5697 skb_put_data(skb, beacon->head, beacon->head_len); 5698 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5699 is_template); 5700 5701 if (offs) { 5702 offs->tim_offset = beacon->head_len; 5703 offs->tim_length = skb->len - beacon->head_len; 5704 } 5705 5706 skb_put_data(skb, beacon->tail, beacon->tail_len); 5707 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5708 chanctx_conf, 0); 5709 } else { 5710 WARN_ON(1); 5711 goto out; 5712 } 5713 5714 out: 5715 rcu_read_unlock(); 5716 return skb; 5717 5718 } 5719 5720 struct sk_buff * 5721 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5722 struct ieee80211_vif *vif, 5723 struct ieee80211_mutable_offsets *offs, 5724 unsigned int link_id) 5725 { 5726 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5727 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5728 } 5729 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5730 5731 struct sk_buff * 5732 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5733 struct ieee80211_vif *vif, 5734 struct ieee80211_mutable_offsets *offs, 5735 unsigned int link_id, u8 ema_index) 5736 { 5737 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5738 NULL); 5739 } 5740 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5741 5742 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5743 { 5744 u8 i; 5745 5746 if (!ema_beacons) 5747 return; 5748 5749 for (i = 0; i < ema_beacons->cnt; i++) 5750 kfree_skb(ema_beacons->bcn[i].skb); 5751 5752 kfree(ema_beacons); 5753 } 5754 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5755 5756 struct ieee80211_ema_beacons * 5757 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5758 struct ieee80211_vif *vif, 5759 unsigned int link_id) 5760 { 5761 struct ieee80211_ema_beacons *ema_beacons = NULL; 5762 5763 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5764 &ema_beacons)); 5765 5766 return ema_beacons; 5767 } 5768 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5769 5770 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5771 struct ieee80211_vif *vif, 5772 u16 *tim_offset, u16 *tim_length, 5773 unsigned int link_id) 5774 { 5775 struct ieee80211_mutable_offsets offs = {}; 5776 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5777 link_id, 5778 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5779 NULL); 5780 struct sk_buff *copy; 5781 5782 if (!bcn) 5783 return bcn; 5784 5785 if (tim_offset) 5786 *tim_offset = offs.tim_offset; 5787 5788 if (tim_length) 5789 *tim_length = offs.tim_length; 5790 5791 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5792 !hw_to_local(hw)->monitors) 5793 return bcn; 5794 5795 /* send a copy to monitor interfaces */ 5796 copy = skb_copy(bcn, GFP_ATOMIC); 5797 if (!copy) 5798 return bcn; 5799 5800 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 5801 5802 return bcn; 5803 } 5804 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5805 5806 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5807 struct ieee80211_vif *vif) 5808 { 5809 struct sk_buff *skb = NULL; 5810 struct probe_resp *presp = NULL; 5811 struct ieee80211_hdr *hdr; 5812 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5813 5814 if (sdata->vif.type != NL80211_IFTYPE_AP) 5815 return NULL; 5816 5817 rcu_read_lock(); 5818 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5819 if (!presp) 5820 goto out; 5821 5822 skb = dev_alloc_skb(presp->len); 5823 if (!skb) 5824 goto out; 5825 5826 skb_put_data(skb, presp->data, presp->len); 5827 5828 hdr = (struct ieee80211_hdr *) skb->data; 5829 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5830 5831 out: 5832 rcu_read_unlock(); 5833 return skb; 5834 } 5835 EXPORT_SYMBOL(ieee80211_proberesp_get); 5836 5837 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5838 struct ieee80211_vif *vif) 5839 { 5840 struct sk_buff *skb = NULL; 5841 struct fils_discovery_data *tmpl = NULL; 5842 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5843 5844 if (sdata->vif.type != NL80211_IFTYPE_AP) 5845 return NULL; 5846 5847 rcu_read_lock(); 5848 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5849 if (!tmpl) { 5850 rcu_read_unlock(); 5851 return NULL; 5852 } 5853 5854 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5855 if (skb) { 5856 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5857 skb_put_data(skb, tmpl->data, tmpl->len); 5858 } 5859 5860 rcu_read_unlock(); 5861 return skb; 5862 } 5863 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5864 5865 struct sk_buff * 5866 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5867 struct ieee80211_vif *vif) 5868 { 5869 struct sk_buff *skb = NULL; 5870 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5871 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5872 5873 if (sdata->vif.type != NL80211_IFTYPE_AP) 5874 return NULL; 5875 5876 rcu_read_lock(); 5877 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5878 if (!tmpl) { 5879 rcu_read_unlock(); 5880 return NULL; 5881 } 5882 5883 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5884 if (skb) { 5885 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5886 skb_put_data(skb, tmpl->data, tmpl->len); 5887 } 5888 5889 rcu_read_unlock(); 5890 return skb; 5891 } 5892 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5893 5894 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5895 struct ieee80211_vif *vif) 5896 { 5897 struct ieee80211_sub_if_data *sdata; 5898 struct ieee80211_pspoll *pspoll; 5899 struct ieee80211_local *local; 5900 struct sk_buff *skb; 5901 5902 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5903 return NULL; 5904 5905 sdata = vif_to_sdata(vif); 5906 local = sdata->local; 5907 5908 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5909 if (!skb) 5910 return NULL; 5911 5912 skb_reserve(skb, local->hw.extra_tx_headroom); 5913 5914 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5915 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5916 IEEE80211_STYPE_PSPOLL); 5917 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5918 5919 /* aid in PS-Poll has its two MSBs each set to 1 */ 5920 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5921 5922 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5923 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5924 5925 return skb; 5926 } 5927 EXPORT_SYMBOL(ieee80211_pspoll_get); 5928 5929 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5930 struct ieee80211_vif *vif, 5931 int link_id, bool qos_ok) 5932 { 5933 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5934 struct ieee80211_local *local = sdata->local; 5935 struct ieee80211_link_data *link = NULL; 5936 struct ieee80211_hdr_3addr *nullfunc; 5937 struct sk_buff *skb; 5938 bool qos = false; 5939 5940 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5941 return NULL; 5942 5943 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5944 sizeof(*nullfunc) + 2); 5945 if (!skb) 5946 return NULL; 5947 5948 rcu_read_lock(); 5949 if (qos_ok) { 5950 struct sta_info *sta; 5951 5952 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5953 qos = sta && sta->sta.wme; 5954 } 5955 5956 if (link_id >= 0) { 5957 link = rcu_dereference(sdata->link[link_id]); 5958 if (WARN_ON_ONCE(!link)) { 5959 rcu_read_unlock(); 5960 kfree_skb(skb); 5961 return NULL; 5962 } 5963 } 5964 5965 skb_reserve(skb, local->hw.extra_tx_headroom); 5966 5967 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5968 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5969 IEEE80211_STYPE_NULLFUNC | 5970 IEEE80211_FCTL_TODS); 5971 if (qos) { 5972 __le16 qoshdr = cpu_to_le16(7); 5973 5974 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5975 IEEE80211_STYPE_NULLFUNC) != 5976 IEEE80211_STYPE_QOS_NULLFUNC); 5977 nullfunc->frame_control |= 5978 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5979 skb->priority = 7; 5980 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5981 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5982 } 5983 5984 if (link) { 5985 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5986 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5987 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5988 } else { 5989 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5990 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5991 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5992 } 5993 rcu_read_unlock(); 5994 5995 return skb; 5996 } 5997 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5998 5999 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 6000 const u8 *src_addr, 6001 const u8 *ssid, size_t ssid_len, 6002 size_t tailroom) 6003 { 6004 struct ieee80211_local *local = hw_to_local(hw); 6005 struct ieee80211_hdr_3addr *hdr; 6006 struct sk_buff *skb; 6007 size_t ie_ssid_len; 6008 u8 *pos; 6009 6010 ie_ssid_len = 2 + ssid_len; 6011 6012 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6013 ie_ssid_len + tailroom); 6014 if (!skb) 6015 return NULL; 6016 6017 skb_reserve(skb, local->hw.extra_tx_headroom); 6018 6019 hdr = skb_put_zero(skb, sizeof(*hdr)); 6020 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6021 IEEE80211_STYPE_PROBE_REQ); 6022 eth_broadcast_addr(hdr->addr1); 6023 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6024 eth_broadcast_addr(hdr->addr3); 6025 6026 pos = skb_put(skb, ie_ssid_len); 6027 *pos++ = WLAN_EID_SSID; 6028 *pos++ = ssid_len; 6029 if (ssid_len) 6030 memcpy(pos, ssid, ssid_len); 6031 pos += ssid_len; 6032 6033 return skb; 6034 } 6035 EXPORT_SYMBOL(ieee80211_probereq_get); 6036 6037 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6038 const void *frame, size_t frame_len, 6039 const struct ieee80211_tx_info *frame_txctl, 6040 struct ieee80211_rts *rts) 6041 { 6042 const struct ieee80211_hdr *hdr = frame; 6043 6044 rts->frame_control = 6045 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6046 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6047 frame_txctl); 6048 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6049 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6050 } 6051 EXPORT_SYMBOL(ieee80211_rts_get); 6052 6053 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6054 const void *frame, size_t frame_len, 6055 const struct ieee80211_tx_info *frame_txctl, 6056 struct ieee80211_cts *cts) 6057 { 6058 const struct ieee80211_hdr *hdr = frame; 6059 6060 cts->frame_control = 6061 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6062 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6063 frame_len, frame_txctl); 6064 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6065 } 6066 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6067 6068 struct sk_buff * 6069 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6070 struct ieee80211_vif *vif) 6071 { 6072 struct ieee80211_local *local = hw_to_local(hw); 6073 struct sk_buff *skb = NULL; 6074 struct ieee80211_tx_data tx; 6075 struct ieee80211_sub_if_data *sdata; 6076 struct ps_data *ps; 6077 struct ieee80211_tx_info *info; 6078 struct ieee80211_chanctx_conf *chanctx_conf; 6079 6080 sdata = vif_to_sdata(vif); 6081 6082 rcu_read_lock(); 6083 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6084 6085 if (!chanctx_conf) 6086 goto out; 6087 6088 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6089 struct beacon_data *beacon = 6090 rcu_dereference(sdata->deflink.u.ap.beacon); 6091 6092 if (!beacon || !beacon->head) 6093 goto out; 6094 6095 ps = &sdata->u.ap.ps; 6096 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6097 ps = &sdata->u.mesh.ps; 6098 } else { 6099 goto out; 6100 } 6101 6102 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6103 goto out; /* send buffered bc/mc only after DTIM beacon */ 6104 6105 while (1) { 6106 skb = skb_dequeue(&ps->bc_buf); 6107 if (!skb) 6108 goto out; 6109 local->total_ps_buffered--; 6110 6111 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6112 struct ieee80211_hdr *hdr = 6113 (struct ieee80211_hdr *) skb->data; 6114 /* more buffered multicast/broadcast frames ==> set 6115 * MoreData flag in IEEE 802.11 header to inform PS 6116 * STAs */ 6117 hdr->frame_control |= 6118 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6119 } 6120 6121 if (sdata->vif.type == NL80211_IFTYPE_AP) 6122 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6123 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6124 break; 6125 ieee80211_free_txskb(hw, skb); 6126 } 6127 6128 info = IEEE80211_SKB_CB(skb); 6129 6130 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6131 info->band = chanctx_conf->def.chan->band; 6132 6133 if (invoke_tx_handlers(&tx)) 6134 skb = NULL; 6135 out: 6136 rcu_read_unlock(); 6137 6138 return skb; 6139 } 6140 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6141 6142 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6143 { 6144 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6145 struct ieee80211_sub_if_data *sdata = sta->sdata; 6146 struct ieee80211_local *local = sdata->local; 6147 int ret; 6148 u32 queues; 6149 6150 lockdep_assert_wiphy(local->hw.wiphy); 6151 6152 /* only some cases are supported right now */ 6153 switch (sdata->vif.type) { 6154 case NL80211_IFTYPE_STATION: 6155 case NL80211_IFTYPE_AP: 6156 case NL80211_IFTYPE_AP_VLAN: 6157 break; 6158 default: 6159 WARN_ON(1); 6160 return -EINVAL; 6161 } 6162 6163 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6164 return -EINVAL; 6165 6166 if (sta->reserved_tid == tid) { 6167 ret = 0; 6168 goto out; 6169 } 6170 6171 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6172 sdata_err(sdata, "TID reservation already active\n"); 6173 ret = -EALREADY; 6174 goto out; 6175 } 6176 6177 ieee80211_stop_vif_queues(sdata->local, sdata, 6178 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6179 6180 synchronize_net(); 6181 6182 /* Tear down BA sessions so we stop aggregating on this TID */ 6183 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6184 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6185 __ieee80211_stop_tx_ba_session(sta, tid, 6186 AGG_STOP_LOCAL_REQUEST); 6187 } 6188 6189 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6190 __ieee80211_flush_queues(local, sdata, queues, false); 6191 6192 sta->reserved_tid = tid; 6193 6194 ieee80211_wake_vif_queues(local, sdata, 6195 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6196 6197 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6198 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6199 6200 ret = 0; 6201 out: 6202 return ret; 6203 } 6204 EXPORT_SYMBOL(ieee80211_reserve_tid); 6205 6206 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6207 { 6208 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6209 struct ieee80211_sub_if_data *sdata = sta->sdata; 6210 6211 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6212 6213 /* only some cases are supported right now */ 6214 switch (sdata->vif.type) { 6215 case NL80211_IFTYPE_STATION: 6216 case NL80211_IFTYPE_AP: 6217 case NL80211_IFTYPE_AP_VLAN: 6218 break; 6219 default: 6220 WARN_ON(1); 6221 return; 6222 } 6223 6224 if (tid != sta->reserved_tid) { 6225 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6226 return; 6227 } 6228 6229 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6230 } 6231 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6232 6233 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6234 struct sk_buff *skb, int tid, int link_id, 6235 enum nl80211_band band) 6236 { 6237 const struct ieee80211_hdr *hdr = (void *)skb->data; 6238 int ac = ieee80211_ac_from_tid(tid); 6239 unsigned int link; 6240 6241 skb_reset_mac_header(skb); 6242 skb_set_queue_mapping(skb, ac); 6243 skb->priority = tid; 6244 6245 skb->dev = sdata->dev; 6246 6247 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6248 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6249 IEEE80211_LINK_UNSPECIFIED)); 6250 6251 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6252 link = 0; 6253 } else if (link_id >= 0) { 6254 link = link_id; 6255 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6256 /* address from the MLD */ 6257 link = IEEE80211_LINK_UNSPECIFIED; 6258 } else { 6259 /* otherwise must be addressed from a link */ 6260 rcu_read_lock(); 6261 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6262 struct ieee80211_bss_conf *link_conf; 6263 6264 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6265 if (!link_conf) 6266 continue; 6267 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6268 break; 6269 } 6270 rcu_read_unlock(); 6271 6272 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6273 link = ffs(sdata->vif.active_links) - 1; 6274 } 6275 6276 IEEE80211_SKB_CB(skb)->control.flags |= 6277 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6278 6279 /* 6280 * The other path calling ieee80211_xmit is from the tasklet, 6281 * and while we can handle concurrent transmissions locking 6282 * requirements are that we do not come into tx with bhs on. 6283 */ 6284 local_bh_disable(); 6285 IEEE80211_SKB_CB(skb)->band = band; 6286 ieee80211_xmit(sdata, NULL, skb); 6287 local_bh_enable(); 6288 } 6289 6290 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6291 struct sk_buff *skb, int tid, int link_id) 6292 { 6293 struct ieee80211_chanctx_conf *chanctx_conf; 6294 enum nl80211_band band; 6295 6296 rcu_read_lock(); 6297 if (sdata->vif.type == NL80211_IFTYPE_NAN) { 6298 band = NUM_NL80211_BANDS; 6299 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6300 WARN_ON(link_id >= 0); 6301 chanctx_conf = 6302 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6303 if (WARN_ON(!chanctx_conf)) { 6304 rcu_read_unlock(); 6305 kfree_skb(skb); 6306 return; 6307 } 6308 band = chanctx_conf->def.chan->band; 6309 } else { 6310 WARN_ON(link_id >= 0 && 6311 !(sdata->vif.active_links & BIT(link_id))); 6312 /* MLD transmissions must not rely on the band */ 6313 band = 0; 6314 } 6315 6316 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6317 rcu_read_unlock(); 6318 } 6319 6320 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6321 const u8 *buf, size_t len, 6322 const u8 *dest, __be16 proto, bool unencrypted, 6323 int link_id, u64 *cookie) 6324 { 6325 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6326 struct ieee80211_local *local = sdata->local; 6327 struct sta_info *sta; 6328 struct sk_buff *skb; 6329 struct ethhdr *ehdr; 6330 u32 ctrl_flags = 0; 6331 u32 flags = 0; 6332 int err; 6333 6334 /* mutex lock is only needed for incrementing the cookie counter */ 6335 lockdep_assert_wiphy(local->hw.wiphy); 6336 6337 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6338 * or Pre-Authentication 6339 */ 6340 if (proto != sdata->control_port_protocol && 6341 proto != cpu_to_be16(ETH_P_PREAUTH)) 6342 return -EINVAL; 6343 6344 if (proto == sdata->control_port_protocol) 6345 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6346 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6347 6348 if (unencrypted) 6349 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6350 6351 if (cookie) 6352 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6353 6354 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6355 6356 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6357 sizeof(struct ethhdr) + len); 6358 if (!skb) 6359 return -ENOMEM; 6360 6361 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6362 6363 skb_put_data(skb, buf, len); 6364 6365 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6366 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6367 6368 /* we may override the SA for MLO STA later */ 6369 if (link_id < 0) { 6370 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6371 IEEE80211_TX_CTRL_MLO_LINK); 6372 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6373 } else { 6374 struct ieee80211_bss_conf *link_conf; 6375 6376 ctrl_flags |= u32_encode_bits(link_id, 6377 IEEE80211_TX_CTRL_MLO_LINK); 6378 6379 rcu_read_lock(); 6380 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6381 if (!link_conf) { 6382 dev_kfree_skb(skb); 6383 rcu_read_unlock(); 6384 return -ENOLINK; 6385 } 6386 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6387 rcu_read_unlock(); 6388 } 6389 6390 ehdr->h_proto = proto; 6391 6392 skb->dev = dev; 6393 skb->protocol = proto; 6394 skb_reset_network_header(skb); 6395 skb_reset_mac_header(skb); 6396 6397 if (local->hw.queues < IEEE80211_NUM_ACS) 6398 goto start_xmit; 6399 6400 /* update QoS header to prioritize control port frames if possible, 6401 * prioritization also happens for control port frames send over 6402 * AF_PACKET 6403 */ 6404 rcu_read_lock(); 6405 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6406 if (err) { 6407 dev_kfree_skb(skb); 6408 rcu_read_unlock(); 6409 return err; 6410 } 6411 6412 if (!IS_ERR(sta)) { 6413 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6414 6415 skb_set_queue_mapping(skb, queue); 6416 6417 /* 6418 * for MLO STA, the SA should be the AP MLD address, but 6419 * the link ID has been selected already 6420 */ 6421 if (sta && sta->sta.mlo) 6422 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6423 } 6424 rcu_read_unlock(); 6425 6426 start_xmit: 6427 local_bh_disable(); 6428 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6429 local_bh_enable(); 6430 6431 return 0; 6432 } 6433 6434 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6435 const u8 *buf, size_t len) 6436 { 6437 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6438 struct ieee80211_local *local = sdata->local; 6439 struct sk_buff *skb; 6440 6441 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6442 30 + /* header size */ 6443 18); /* 11s header size */ 6444 if (!skb) 6445 return -ENOMEM; 6446 6447 skb_reserve(skb, local->hw.extra_tx_headroom); 6448 skb_put_data(skb, buf, len); 6449 6450 skb->dev = dev; 6451 skb->protocol = htons(ETH_P_802_3); 6452 skb_reset_network_header(skb); 6453 skb_reset_mac_header(skb); 6454 6455 local_bh_disable(); 6456 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6457 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6458 NULL); 6459 local_bh_enable(); 6460 6461 return 0; 6462 } 6463