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(tx); 1066 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1067 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1068 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1069 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1070 return ieee80211_crypto_aes_gmac_encrypt(tx); 1071 case WLAN_CIPHER_SUITE_GCMP: 1072 case WLAN_CIPHER_SUITE_GCMP_256: 1073 return ieee80211_crypto_gcmp_encrypt(tx); 1074 } 1075 1076 return TX_DROP; 1077 } 1078 1079 static ieee80211_tx_result debug_noinline 1080 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1081 { 1082 struct sk_buff *skb; 1083 struct ieee80211_hdr *hdr; 1084 int next_len; 1085 bool group_addr; 1086 1087 skb_queue_walk(&tx->skbs, skb) { 1088 hdr = (void *) skb->data; 1089 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1090 break; /* must not overwrite AID */ 1091 if (!skb_queue_is_last(&tx->skbs, skb)) { 1092 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1093 next_len = next->len; 1094 } else 1095 next_len = 0; 1096 group_addr = is_multicast_ether_addr(hdr->addr1); 1097 1098 hdr->duration_id = 1099 ieee80211_duration(tx, skb, group_addr, next_len); 1100 } 1101 1102 return TX_CONTINUE; 1103 } 1104 1105 /* actual transmit path */ 1106 1107 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1108 struct sk_buff *skb, 1109 struct ieee80211_tx_info *info, 1110 struct tid_ampdu_tx *tid_tx, 1111 int tid) 1112 { 1113 bool queued = false; 1114 bool reset_agg_timer = false; 1115 struct sk_buff *purge_skb = NULL; 1116 1117 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1118 reset_agg_timer = true; 1119 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1120 /* 1121 * nothing -- this aggregation session is being started 1122 * but that might still fail with the driver 1123 */ 1124 } else if (!tx->sta->sta.txq[tid]) { 1125 spin_lock(&tx->sta->lock); 1126 /* 1127 * Need to re-check now, because we may get here 1128 * 1129 * 1) in the window during which the setup is actually 1130 * already done, but not marked yet because not all 1131 * packets are spliced over to the driver pending 1132 * queue yet -- if this happened we acquire the lock 1133 * either before or after the splice happens, but 1134 * need to recheck which of these cases happened. 1135 * 1136 * 2) during session teardown, if the OPERATIONAL bit 1137 * was cleared due to the teardown but the pointer 1138 * hasn't been assigned NULL yet (or we loaded it 1139 * before it was assigned) -- in this case it may 1140 * now be NULL which means we should just let the 1141 * packet pass through because splicing the frames 1142 * back is already done. 1143 */ 1144 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1145 1146 if (!tid_tx) { 1147 /* do nothing, let packet pass through */ 1148 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1149 reset_agg_timer = true; 1150 } else { 1151 queued = true; 1152 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1153 clear_sta_flag(tx->sta, WLAN_STA_SP); 1154 ps_dbg(tx->sta->sdata, 1155 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1156 tx->sta->sta.addr, tx->sta->sta.aid); 1157 } 1158 info->control.vif = &tx->sdata->vif; 1159 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1160 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1161 __skb_queue_tail(&tid_tx->pending, skb); 1162 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1163 purge_skb = __skb_dequeue(&tid_tx->pending); 1164 } 1165 spin_unlock(&tx->sta->lock); 1166 1167 if (purge_skb) 1168 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1169 } 1170 1171 /* reset session timer */ 1172 if (reset_agg_timer) 1173 tid_tx->last_tx = jiffies; 1174 1175 return queued; 1176 } 1177 1178 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1179 struct sta_info *sta, struct sk_buff *skb) 1180 { 1181 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1182 u16 tid; 1183 1184 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1185 return; 1186 1187 if (!sta || 1188 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1189 !sta->sta.deflink.s1g_cap.s1g) || 1190 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1191 skb->protocol == sdata->control_port_protocol) 1192 return; 1193 1194 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1195 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1196 return; 1197 1198 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1199 } 1200 1201 /* 1202 * initialises @tx 1203 * pass %NULL for the station if unknown, a valid pointer if known 1204 * or an ERR_PTR() if the station is known not to exist 1205 */ 1206 static ieee80211_tx_result 1207 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1208 struct ieee80211_tx_data *tx, 1209 struct sta_info *sta, struct sk_buff *skb) 1210 { 1211 struct ieee80211_local *local = sdata->local; 1212 struct ieee80211_hdr *hdr; 1213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1214 bool aggr_check = false; 1215 int tid; 1216 1217 memset(tx, 0, sizeof(*tx)); 1218 tx->skb = skb; 1219 tx->local = local; 1220 tx->sdata = sdata; 1221 __skb_queue_head_init(&tx->skbs); 1222 1223 /* 1224 * If this flag is set to true anywhere, and we get here, 1225 * we are doing the needed processing, so remove the flag 1226 * now. 1227 */ 1228 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1229 1230 hdr = (struct ieee80211_hdr *) skb->data; 1231 1232 if (likely(sta)) { 1233 if (!IS_ERR(sta)) 1234 tx->sta = sta; 1235 } else { 1236 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1237 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1238 if (!tx->sta && sdata->wdev.use_4addr) 1239 return TX_DROP; 1240 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1241 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1242 } 1243 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1244 tx->sta = sta_info_get(sdata, hdr->addr1); 1245 aggr_check = true; 1246 } 1247 } 1248 1249 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1250 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1251 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1252 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1253 struct tid_ampdu_tx *tid_tx; 1254 1255 tid = ieee80211_get_tid(hdr); 1256 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1257 if (!tid_tx && aggr_check) { 1258 ieee80211_aggr_check(sdata, tx->sta, skb); 1259 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1260 } 1261 1262 if (tid_tx) { 1263 bool queued; 1264 1265 queued = ieee80211_tx_prep_agg(tx, skb, info, 1266 tid_tx, tid); 1267 1268 if (unlikely(queued)) 1269 return TX_QUEUED; 1270 } 1271 } 1272 1273 if (is_multicast_ether_addr(hdr->addr1)) { 1274 tx->flags &= ~IEEE80211_TX_UNICAST; 1275 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1276 } else 1277 tx->flags |= IEEE80211_TX_UNICAST; 1278 1279 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1280 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1281 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1282 info->flags & IEEE80211_TX_CTL_AMPDU) 1283 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1284 } 1285 1286 if (!tx->sta) 1287 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1288 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1289 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1290 ieee80211_check_fast_xmit(tx->sta); 1291 } 1292 1293 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1294 1295 return TX_CONTINUE; 1296 } 1297 1298 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1299 struct ieee80211_vif *vif, 1300 struct sta_info *sta, 1301 struct sk_buff *skb) 1302 { 1303 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1304 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1305 struct ieee80211_txq *txq = NULL; 1306 1307 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1308 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1309 return NULL; 1310 1311 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1312 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1313 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1314 ieee80211_is_bufferable_mmpdu(skb) || 1315 vif->type == NL80211_IFTYPE_STATION) && 1316 sta && sta->uploaded) { 1317 /* 1318 * This will be NULL if the driver didn't set the 1319 * opt-in hardware flag. 1320 */ 1321 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1322 } 1323 } else if (sta) { 1324 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1325 1326 if (!sta->uploaded) 1327 return NULL; 1328 1329 txq = sta->sta.txq[tid]; 1330 } else { 1331 txq = vif->txq; 1332 } 1333 1334 if (!txq) 1335 return NULL; 1336 1337 return to_txq_info(txq); 1338 } 1339 1340 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1341 { 1342 struct sk_buff *next; 1343 codel_time_t now = codel_get_time(); 1344 1345 skb_list_walk_safe(skb, skb, next) 1346 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1347 } 1348 1349 static u32 codel_skb_len_func(const struct sk_buff *skb) 1350 { 1351 return skb->len; 1352 } 1353 1354 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1355 { 1356 const struct ieee80211_tx_info *info; 1357 1358 info = (const struct ieee80211_tx_info *)skb->cb; 1359 return info->control.enqueue_time; 1360 } 1361 1362 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1363 void *ctx) 1364 { 1365 struct ieee80211_local *local; 1366 struct txq_info *txqi; 1367 struct fq *fq; 1368 struct fq_flow *flow; 1369 1370 txqi = ctx; 1371 local = vif_to_sdata(txqi->txq.vif)->local; 1372 fq = &local->fq; 1373 1374 if (cvars == &txqi->def_cvars) 1375 flow = &txqi->tin.default_flow; 1376 else 1377 flow = &fq->flows[cvars - local->cvars]; 1378 1379 return fq_flow_dequeue(fq, flow); 1380 } 1381 1382 static void codel_drop_func(struct sk_buff *skb, 1383 void *ctx) 1384 { 1385 struct ieee80211_local *local; 1386 struct ieee80211_hw *hw; 1387 struct txq_info *txqi; 1388 1389 txqi = ctx; 1390 local = vif_to_sdata(txqi->txq.vif)->local; 1391 hw = &local->hw; 1392 1393 ieee80211_free_txskb(hw, skb); 1394 } 1395 1396 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1397 struct fq_tin *tin, 1398 struct fq_flow *flow) 1399 { 1400 struct ieee80211_local *local; 1401 struct txq_info *txqi; 1402 struct codel_vars *cvars; 1403 struct codel_params *cparams; 1404 struct codel_stats *cstats; 1405 1406 local = container_of(fq, struct ieee80211_local, fq); 1407 txqi = container_of(tin, struct txq_info, tin); 1408 cparams = &local->cparams; 1409 cstats = &txqi->cstats; 1410 1411 if (flow == &tin->default_flow) 1412 cvars = &txqi->def_cvars; 1413 else 1414 cvars = &local->cvars[flow - fq->flows]; 1415 1416 return codel_dequeue(txqi, 1417 &flow->backlog, 1418 cparams, 1419 cvars, 1420 cstats, 1421 codel_skb_len_func, 1422 codel_skb_time_func, 1423 codel_drop_func, 1424 codel_dequeue_func); 1425 } 1426 1427 static void fq_skb_free_func(struct fq *fq, 1428 struct fq_tin *tin, 1429 struct fq_flow *flow, 1430 struct sk_buff *skb) 1431 { 1432 struct ieee80211_local *local; 1433 1434 local = container_of(fq, struct ieee80211_local, fq); 1435 ieee80211_free_txskb(&local->hw, skb); 1436 } 1437 1438 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1439 struct txq_info *txqi, 1440 struct sk_buff *skb) 1441 { 1442 struct fq *fq = &local->fq; 1443 struct fq_tin *tin = &txqi->tin; 1444 u32 flow_idx; 1445 1446 ieee80211_set_skb_enqueue_time(skb); 1447 1448 spin_lock_bh(&fq->lock); 1449 /* 1450 * For management frames, don't really apply codel etc., 1451 * we don't want to apply any shaping or anything we just 1452 * want to simplify the driver API by having them on the 1453 * txqi. 1454 */ 1455 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1456 IEEE80211_SKB_CB(skb)->control.flags |= 1457 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1458 __skb_queue_tail(&txqi->frags, skb); 1459 } else { 1460 flow_idx = fq_flow_idx(fq, skb); 1461 fq_tin_enqueue(fq, tin, flow_idx, skb, 1462 fq_skb_free_func); 1463 } 1464 spin_unlock_bh(&fq->lock); 1465 } 1466 1467 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1468 struct fq_flow *flow, struct sk_buff *skb, 1469 void *data) 1470 { 1471 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1472 1473 return info->control.vif == data; 1474 } 1475 1476 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1477 struct ieee80211_sub_if_data *sdata) 1478 { 1479 struct fq *fq = &local->fq; 1480 struct txq_info *txqi; 1481 struct fq_tin *tin; 1482 struct ieee80211_sub_if_data *ap; 1483 1484 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1485 return; 1486 1487 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1488 1489 if (!ap->vif.txq) 1490 return; 1491 1492 txqi = to_txq_info(ap->vif.txq); 1493 tin = &txqi->tin; 1494 1495 spin_lock_bh(&fq->lock); 1496 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1497 fq_skb_free_func); 1498 spin_unlock_bh(&fq->lock); 1499 } 1500 1501 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1502 struct sta_info *sta, 1503 struct txq_info *txqi, int tid) 1504 { 1505 fq_tin_init(&txqi->tin); 1506 codel_vars_init(&txqi->def_cvars); 1507 codel_stats_init(&txqi->cstats); 1508 __skb_queue_head_init(&txqi->frags); 1509 INIT_LIST_HEAD(&txqi->schedule_order); 1510 1511 txqi->txq.vif = &sdata->vif; 1512 1513 if (!sta) { 1514 sdata->vif.txq = &txqi->txq; 1515 txqi->txq.tid = 0; 1516 txqi->txq.ac = IEEE80211_AC_BE; 1517 1518 return; 1519 } 1520 1521 if (tid == IEEE80211_NUM_TIDS) { 1522 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1523 /* Drivers need to opt in to the management MPDU TXQ */ 1524 if (!ieee80211_hw_check(&sdata->local->hw, 1525 STA_MMPDU_TXQ)) 1526 return; 1527 } else if (!ieee80211_hw_check(&sdata->local->hw, 1528 BUFF_MMPDU_TXQ)) { 1529 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1530 return; 1531 } 1532 txqi->txq.ac = IEEE80211_AC_VO; 1533 } else { 1534 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1535 } 1536 1537 txqi->txq.sta = &sta->sta; 1538 txqi->txq.tid = tid; 1539 sta->sta.txq[tid] = &txqi->txq; 1540 } 1541 1542 void ieee80211_txq_purge(struct ieee80211_local *local, 1543 struct txq_info *txqi) 1544 { 1545 struct fq *fq = &local->fq; 1546 struct fq_tin *tin = &txqi->tin; 1547 1548 spin_lock_bh(&fq->lock); 1549 fq_tin_reset(fq, tin, fq_skb_free_func); 1550 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1551 spin_unlock_bh(&fq->lock); 1552 1553 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1554 list_del_init(&txqi->schedule_order); 1555 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1556 } 1557 1558 void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx) 1559 { 1560 if (local->hw.wiphy->txq_limit) 1561 local->fq.limit = local->hw.wiphy->txq_limit; 1562 else 1563 local->hw.wiphy->txq_limit = local->fq.limit; 1564 1565 if (local->hw.wiphy->txq_memory_limit) 1566 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1567 else 1568 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1569 1570 if (local->hw.wiphy->txq_quantum) 1571 local->fq.quantum = local->hw.wiphy->txq_quantum; 1572 else 1573 local->hw.wiphy->txq_quantum = local->fq.quantum; 1574 } 1575 1576 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1577 { 1578 struct fq *fq = &local->fq; 1579 int ret; 1580 int i; 1581 bool supp_vht = false; 1582 enum nl80211_band band; 1583 1584 ret = fq_init(fq, 4096); 1585 if (ret) 1586 return ret; 1587 1588 /* 1589 * If the hardware doesn't support VHT, it is safe to limit the maximum 1590 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1591 */ 1592 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1593 struct ieee80211_supported_band *sband; 1594 1595 sband = local->hw.wiphy->bands[band]; 1596 if (!sband) 1597 continue; 1598 1599 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1600 } 1601 1602 if (!supp_vht) 1603 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1604 1605 codel_params_init(&local->cparams); 1606 local->cparams.interval = MS2TIME(100); 1607 local->cparams.target = MS2TIME(20); 1608 local->cparams.ecn = true; 1609 1610 local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1611 GFP_KERNEL); 1612 if (!local->cvars) { 1613 spin_lock_bh(&fq->lock); 1614 fq_reset(fq, fq_skb_free_func); 1615 spin_unlock_bh(&fq->lock); 1616 return -ENOMEM; 1617 } 1618 1619 for (i = 0; i < fq->flows_cnt; i++) 1620 codel_vars_init(&local->cvars[i]); 1621 1622 ieee80211_txq_set_params(local, -1); 1623 1624 return 0; 1625 } 1626 1627 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1628 { 1629 struct fq *fq = &local->fq; 1630 1631 kvfree(local->cvars); 1632 local->cvars = NULL; 1633 1634 spin_lock_bh(&fq->lock); 1635 fq_reset(fq, fq_skb_free_func); 1636 spin_unlock_bh(&fq->lock); 1637 } 1638 1639 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1640 struct ieee80211_sub_if_data *sdata, 1641 struct sta_info *sta, 1642 struct sk_buff *skb) 1643 { 1644 struct ieee80211_vif *vif; 1645 struct txq_info *txqi; 1646 1647 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1648 return false; 1649 1650 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1651 sdata = container_of(sdata->bss, 1652 struct ieee80211_sub_if_data, u.ap); 1653 1654 vif = &sdata->vif; 1655 txqi = ieee80211_get_txq(local, vif, sta, skb); 1656 1657 if (!txqi) 1658 return false; 1659 1660 ieee80211_txq_enqueue(local, txqi, skb); 1661 1662 schedule_and_wake_txq(local, txqi); 1663 1664 return true; 1665 } 1666 1667 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1668 struct ieee80211_vif *vif, 1669 struct sta_info *sta, 1670 struct sk_buff_head *skbs, 1671 bool txpending) 1672 { 1673 struct ieee80211_tx_control control = {}; 1674 struct sk_buff *skb, *tmp; 1675 unsigned long flags; 1676 1677 skb_queue_walk_safe(skbs, skb, tmp) { 1678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1679 int q = info->hw_queue; 1680 1681 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1682 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1683 __skb_unlink(skb, skbs); 1684 ieee80211_free_txskb(&local->hw, skb); 1685 continue; 1686 } 1687 #endif 1688 1689 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1690 if (local->queue_stop_reasons[q] || 1691 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1692 if (unlikely(info->flags & 1693 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1694 if (local->queue_stop_reasons[q] & 1695 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1696 /* 1697 * Drop off-channel frames if queues 1698 * are stopped for any reason other 1699 * than off-channel operation. Never 1700 * queue them. 1701 */ 1702 spin_unlock_irqrestore( 1703 &local->queue_stop_reason_lock, 1704 flags); 1705 ieee80211_purge_tx_queue(&local->hw, 1706 skbs); 1707 return true; 1708 } 1709 } else { 1710 1711 /* 1712 * Since queue is stopped, queue up frames for 1713 * later transmission from the tx-pending 1714 * tasklet when the queue is woken again. 1715 */ 1716 if (txpending) 1717 skb_queue_splice_init(skbs, 1718 &local->pending[q]); 1719 else 1720 skb_queue_splice_tail_init(skbs, 1721 &local->pending[q]); 1722 1723 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1724 flags); 1725 return false; 1726 } 1727 } 1728 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1729 1730 info->control.vif = vif; 1731 control.sta = sta ? &sta->sta : NULL; 1732 1733 __skb_unlink(skb, skbs); 1734 drv_tx(local, &control, skb); 1735 } 1736 1737 return true; 1738 } 1739 1740 /* 1741 * Returns false if the frame couldn't be transmitted but was queued instead. 1742 */ 1743 static bool __ieee80211_tx(struct ieee80211_local *local, 1744 struct sk_buff_head *skbs, struct sta_info *sta, 1745 bool txpending) 1746 { 1747 struct ieee80211_tx_info *info; 1748 struct ieee80211_sub_if_data *sdata; 1749 struct ieee80211_vif *vif; 1750 struct sk_buff *skb; 1751 bool result; 1752 1753 if (WARN_ON(skb_queue_empty(skbs))) 1754 return true; 1755 1756 skb = skb_peek(skbs); 1757 info = IEEE80211_SKB_CB(skb); 1758 sdata = vif_to_sdata(info->control.vif); 1759 if (sta && !sta->uploaded) 1760 sta = NULL; 1761 1762 switch (sdata->vif.type) { 1763 case NL80211_IFTYPE_MONITOR: 1764 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1765 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1766 vif = &sdata->vif; 1767 break; 1768 } 1769 sdata = rcu_dereference(local->monitor_sdata); 1770 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1771 vif = &sdata->vif; 1772 info->hw_queue = 1773 vif->hw_queue[skb_get_queue_mapping(skb)]; 1774 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1775 ieee80211_purge_tx_queue(&local->hw, skbs); 1776 return true; 1777 } else 1778 vif = NULL; 1779 break; 1780 case NL80211_IFTYPE_AP_VLAN: 1781 sdata = container_of(sdata->bss, 1782 struct ieee80211_sub_if_data, u.ap); 1783 fallthrough; 1784 default: 1785 vif = &sdata->vif; 1786 break; 1787 } 1788 1789 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1790 1791 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1792 1793 return result; 1794 } 1795 1796 /* 1797 * Invoke TX handlers, return 0 on success and non-zero if the 1798 * frame was dropped or queued. 1799 * 1800 * The handlers are split into an early and late part. The latter is everything 1801 * that can be sensitive to reordering, and will be deferred to after packets 1802 * are dequeued from the intermediate queues (when they are enabled). 1803 */ 1804 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1805 { 1806 ieee80211_tx_result res = TX_DROP; 1807 1808 #define CALL_TXH(txh) \ 1809 do { \ 1810 res = txh(tx); \ 1811 if (res != TX_CONTINUE) \ 1812 goto txh_done; \ 1813 } while (0) 1814 1815 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1816 CALL_TXH(ieee80211_tx_h_check_assoc); 1817 CALL_TXH(ieee80211_tx_h_ps_buf); 1818 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1819 CALL_TXH(ieee80211_tx_h_select_key); 1820 1821 txh_done: 1822 if (unlikely(res == TX_DROP)) { 1823 tx->sdata->tx_handlers_drop++; 1824 if (tx->skb) 1825 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1826 else 1827 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1828 return -1; 1829 } else if (unlikely(res == TX_QUEUED)) { 1830 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1831 return -1; 1832 } 1833 1834 return 0; 1835 } 1836 1837 /* 1838 * Late handlers can be called while the sta lock is held. Handlers that can 1839 * cause packets to be generated will cause deadlock! 1840 */ 1841 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1842 { 1843 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1844 ieee80211_tx_result res = TX_CONTINUE; 1845 1846 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1847 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1848 1849 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1850 __skb_queue_tail(&tx->skbs, tx->skb); 1851 tx->skb = NULL; 1852 goto txh_done; 1853 } 1854 1855 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1856 CALL_TXH(ieee80211_tx_h_sequence); 1857 CALL_TXH(ieee80211_tx_h_fragment); 1858 /* handlers after fragment must be aware of tx info fragmentation! */ 1859 CALL_TXH(ieee80211_tx_h_stats); 1860 CALL_TXH(ieee80211_tx_h_encrypt); 1861 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1862 CALL_TXH(ieee80211_tx_h_calculate_duration); 1863 #undef CALL_TXH 1864 1865 txh_done: 1866 if (unlikely(res == TX_DROP)) { 1867 tx->sdata->tx_handlers_drop++; 1868 if (tx->skb) 1869 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1870 else 1871 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1872 return -1; 1873 } else if (unlikely(res == TX_QUEUED)) { 1874 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1875 return -1; 1876 } 1877 1878 return 0; 1879 } 1880 1881 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1882 { 1883 int r = invoke_tx_handlers_early(tx); 1884 1885 if (r) 1886 return r; 1887 return invoke_tx_handlers_late(tx); 1888 } 1889 1890 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1891 struct ieee80211_vif *vif, struct sk_buff *skb, 1892 int band, struct ieee80211_sta **sta) 1893 { 1894 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1895 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1896 struct ieee80211_tx_data tx; 1897 struct sk_buff *skb2; 1898 1899 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1900 return false; 1901 1902 info->band = band; 1903 info->control.vif = vif; 1904 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1905 1906 if (invoke_tx_handlers(&tx)) 1907 return false; 1908 1909 if (sta) { 1910 if (tx.sta) 1911 *sta = &tx.sta->sta; 1912 else 1913 *sta = NULL; 1914 } 1915 1916 /* this function isn't suitable for fragmented data frames */ 1917 skb2 = __skb_dequeue(&tx.skbs); 1918 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1919 ieee80211_free_txskb(hw, skb2); 1920 ieee80211_purge_tx_queue(hw, &tx.skbs); 1921 return false; 1922 } 1923 1924 return true; 1925 } 1926 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1927 1928 /* 1929 * Returns false if the frame couldn't be transmitted but was queued instead. 1930 */ 1931 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1932 struct sta_info *sta, struct sk_buff *skb, 1933 bool txpending) 1934 { 1935 struct ieee80211_local *local = sdata->local; 1936 struct ieee80211_tx_data tx; 1937 ieee80211_tx_result res_prepare; 1938 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1939 bool result = true; 1940 1941 if (unlikely(skb->len < 10)) { 1942 dev_kfree_skb(skb); 1943 return true; 1944 } 1945 1946 /* initialises tx */ 1947 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1948 1949 if (unlikely(res_prepare == TX_DROP)) { 1950 ieee80211_free_txskb(&local->hw, skb); 1951 tx.sdata->tx_handlers_drop++; 1952 return true; 1953 } else if (unlikely(res_prepare == TX_QUEUED)) { 1954 return true; 1955 } 1956 1957 /* set up hw_queue value early */ 1958 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1959 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1960 info->hw_queue = 1961 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1962 1963 if (invoke_tx_handlers_early(&tx)) 1964 return true; 1965 1966 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1967 return true; 1968 1969 if (!invoke_tx_handlers_late(&tx)) 1970 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1971 1972 return result; 1973 } 1974 1975 /* device xmit handlers */ 1976 1977 enum ieee80211_encrypt { 1978 ENCRYPT_NO, 1979 ENCRYPT_MGMT, 1980 ENCRYPT_DATA, 1981 }; 1982 1983 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1984 struct sk_buff *skb, 1985 int head_need, 1986 enum ieee80211_encrypt encrypt) 1987 { 1988 struct ieee80211_local *local = sdata->local; 1989 bool enc_tailroom; 1990 int tail_need = 0; 1991 1992 enc_tailroom = encrypt == ENCRYPT_MGMT || 1993 (encrypt == ENCRYPT_DATA && 1994 sdata->crypto_tx_tailroom_needed_cnt); 1995 1996 if (enc_tailroom) { 1997 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1998 tail_need -= skb_tailroom(skb); 1999 tail_need = max_t(int, tail_need, 0); 2000 } 2001 2002 if (skb_cloned(skb) && 2003 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2004 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2005 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2006 else if (head_need || tail_need) 2007 I802_DEBUG_INC(local->tx_expand_skb_head); 2008 else 2009 return 0; 2010 2011 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2012 wiphy_debug(local->hw.wiphy, 2013 "failed to reallocate TX buffer\n"); 2014 return -ENOMEM; 2015 } 2016 2017 return 0; 2018 } 2019 2020 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2021 struct sta_info *sta, struct sk_buff *skb) 2022 { 2023 struct ieee80211_local *local = sdata->local; 2024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2025 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2026 int headroom; 2027 enum ieee80211_encrypt encrypt; 2028 2029 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2030 encrypt = ENCRYPT_NO; 2031 else if (ieee80211_is_mgmt(hdr->frame_control)) 2032 encrypt = ENCRYPT_MGMT; 2033 else 2034 encrypt = ENCRYPT_DATA; 2035 2036 headroom = local->tx_headroom; 2037 if (encrypt != ENCRYPT_NO) 2038 headroom += IEEE80211_ENCRYPT_HEADROOM; 2039 headroom -= skb_headroom(skb); 2040 headroom = max_t(int, 0, headroom); 2041 2042 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2043 ieee80211_free_txskb(&local->hw, skb); 2044 return; 2045 } 2046 2047 /* reload after potential resize */ 2048 hdr = (struct ieee80211_hdr *) skb->data; 2049 info->control.vif = &sdata->vif; 2050 2051 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2052 if (ieee80211_is_data(hdr->frame_control) && 2053 is_unicast_ether_addr(hdr->addr1)) { 2054 if (mesh_nexthop_resolve(sdata, skb)) 2055 return; /* skb queued: don't free */ 2056 } else { 2057 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2058 } 2059 } 2060 2061 ieee80211_set_qos_hdr(sdata, skb); 2062 ieee80211_tx(sdata, sta, skb, false); 2063 } 2064 2065 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2066 { 2067 struct ieee80211_radiotap_header *rthdr = 2068 (struct ieee80211_radiotap_header *)skb->data; 2069 2070 /* check for not even having the fixed radiotap header part */ 2071 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2072 return false; /* too short to be possibly valid */ 2073 2074 /* is it a header version we can trust to find length from? */ 2075 if (unlikely(rthdr->it_version)) 2076 return false; /* only version 0 is supported */ 2077 2078 /* does the skb contain enough to deliver on the alleged length? */ 2079 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2080 return false; /* skb too short for claimed rt header extent */ 2081 2082 return true; 2083 } 2084 2085 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2086 struct net_device *dev) 2087 { 2088 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2089 struct ieee80211_radiotap_iterator iterator; 2090 struct ieee80211_radiotap_header *rthdr = 2091 (struct ieee80211_radiotap_header *) skb->data; 2092 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2093 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2094 NULL); 2095 u16 txflags; 2096 u16 rate = 0; 2097 bool rate_found = false; 2098 u8 rate_retries = 0; 2099 u16 rate_flags = 0; 2100 u8 mcs_known, mcs_flags, mcs_bw; 2101 u16 vht_known; 2102 u8 vht_mcs = 0, vht_nss = 0; 2103 int i; 2104 2105 if (!ieee80211_validate_radiotap_len(skb)) 2106 return false; 2107 2108 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2109 IEEE80211_TX_CTL_DONTFRAG; 2110 2111 /* 2112 * for every radiotap entry that is present 2113 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2114 * entries present, or -EINVAL on error) 2115 */ 2116 2117 while (!ret) { 2118 ret = ieee80211_radiotap_iterator_next(&iterator); 2119 2120 if (ret) 2121 continue; 2122 2123 /* see if this argument is something we can use */ 2124 switch (iterator.this_arg_index) { 2125 /* 2126 * You must take care when dereferencing iterator.this_arg 2127 * for multibyte types... the pointer is not aligned. Use 2128 * get_unaligned((type *)iterator.this_arg) to dereference 2129 * iterator.this_arg for type "type" safely on all arches. 2130 */ 2131 case IEEE80211_RADIOTAP_FLAGS: 2132 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2133 /* 2134 * this indicates that the skb we have been 2135 * handed has the 32-bit FCS CRC at the end... 2136 * we should react to that by snipping it off 2137 * because it will be recomputed and added 2138 * on transmission 2139 */ 2140 if (skb->len < (iterator._max_length + FCS_LEN)) 2141 return false; 2142 2143 skb_trim(skb, skb->len - FCS_LEN); 2144 } 2145 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2146 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2147 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2148 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2149 break; 2150 2151 case IEEE80211_RADIOTAP_TX_FLAGS: 2152 txflags = get_unaligned_le16(iterator.this_arg); 2153 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2154 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2155 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2156 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2157 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2158 info->control.flags |= 2159 IEEE80211_TX_CTRL_DONT_REORDER; 2160 break; 2161 2162 case IEEE80211_RADIOTAP_RATE: 2163 rate = *iterator.this_arg; 2164 rate_flags = 0; 2165 rate_found = true; 2166 break; 2167 2168 case IEEE80211_RADIOTAP_ANTENNA: 2169 /* this can appear multiple times, keep a bitmap */ 2170 info->control.antennas |= BIT(*iterator.this_arg); 2171 break; 2172 2173 case IEEE80211_RADIOTAP_DATA_RETRIES: 2174 rate_retries = *iterator.this_arg; 2175 break; 2176 2177 case IEEE80211_RADIOTAP_MCS: 2178 mcs_known = iterator.this_arg[0]; 2179 mcs_flags = iterator.this_arg[1]; 2180 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2181 break; 2182 2183 rate_found = true; 2184 rate = iterator.this_arg[2]; 2185 rate_flags = IEEE80211_TX_RC_MCS; 2186 2187 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2188 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2189 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2190 2191 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2192 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2193 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2194 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2195 2196 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2197 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2198 info->flags |= IEEE80211_TX_CTL_LDPC; 2199 2200 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2201 u8 stbc = u8_get_bits(mcs_flags, 2202 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2203 2204 info->flags |= 2205 u32_encode_bits(stbc, 2206 IEEE80211_TX_CTL_STBC); 2207 } 2208 break; 2209 2210 case IEEE80211_RADIOTAP_VHT: 2211 vht_known = get_unaligned_le16(iterator.this_arg); 2212 rate_found = true; 2213 2214 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2215 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2216 (iterator.this_arg[2] & 2217 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2218 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2219 if (vht_known & 2220 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2221 if (iterator.this_arg[3] == 1) 2222 rate_flags |= 2223 IEEE80211_TX_RC_40_MHZ_WIDTH; 2224 else if (iterator.this_arg[3] == 4) 2225 rate_flags |= 2226 IEEE80211_TX_RC_80_MHZ_WIDTH; 2227 else if (iterator.this_arg[3] == 11) 2228 rate_flags |= 2229 IEEE80211_TX_RC_160_MHZ_WIDTH; 2230 } 2231 2232 vht_mcs = iterator.this_arg[4] >> 4; 2233 if (vht_mcs > 11) 2234 vht_mcs = 0; 2235 vht_nss = iterator.this_arg[4] & 0xF; 2236 if (!vht_nss || vht_nss > 8) 2237 vht_nss = 1; 2238 break; 2239 2240 /* 2241 * Please update the file 2242 * Documentation/networking/mac80211-injection.rst 2243 * when parsing new fields here. 2244 */ 2245 2246 default: 2247 break; 2248 } 2249 } 2250 2251 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2252 return false; 2253 2254 if (rate_found) { 2255 struct ieee80211_supported_band *sband = 2256 local->hw.wiphy->bands[info->band]; 2257 2258 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2259 2260 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2261 info->control.rates[i].idx = -1; 2262 info->control.rates[i].flags = 0; 2263 info->control.rates[i].count = 0; 2264 } 2265 2266 if (rate_flags & IEEE80211_TX_RC_MCS) { 2267 /* reset antennas if not enough */ 2268 if (IEEE80211_HT_MCS_CHAINS(rate) > 2269 hweight8(info->control.antennas)) 2270 info->control.antennas = 0; 2271 2272 info->control.rates[0].idx = rate; 2273 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2274 /* reset antennas if not enough */ 2275 if (vht_nss > hweight8(info->control.antennas)) 2276 info->control.antennas = 0; 2277 2278 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2279 vht_nss); 2280 } else if (sband) { 2281 for (i = 0; i < sband->n_bitrates; i++) { 2282 if (rate * 5 != sband->bitrates[i].bitrate) 2283 continue; 2284 2285 info->control.rates[0].idx = i; 2286 break; 2287 } 2288 } 2289 2290 if (info->control.rates[0].idx < 0) 2291 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2292 2293 info->control.rates[0].flags = rate_flags; 2294 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2295 local->hw.max_rate_tries); 2296 } 2297 2298 return true; 2299 } 2300 2301 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2302 struct net_device *dev) 2303 { 2304 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2305 struct ieee80211_chanctx_conf *chanctx_conf; 2306 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2307 struct ieee80211_hdr *hdr; 2308 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2309 struct cfg80211_chan_def *chandef; 2310 u16 len_rthdr; 2311 int hdrlen; 2312 2313 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2314 if (unlikely(!ieee80211_sdata_running(sdata))) 2315 goto fail; 2316 2317 memset(info, 0, sizeof(*info)); 2318 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2319 IEEE80211_TX_CTL_INJECTED; 2320 2321 /* Sanity-check the length of the radiotap header */ 2322 if (!ieee80211_validate_radiotap_len(skb)) 2323 goto fail; 2324 2325 /* we now know there is a radiotap header with a length we can use */ 2326 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2327 2328 /* 2329 * fix up the pointers accounting for the radiotap 2330 * header still being in there. We are being given 2331 * a precooked IEEE80211 header so no need for 2332 * normal processing 2333 */ 2334 skb_set_mac_header(skb, len_rthdr); 2335 /* 2336 * these are just fixed to the end of the rt area since we 2337 * don't have any better information and at this point, nobody cares 2338 */ 2339 skb_set_network_header(skb, len_rthdr); 2340 skb_set_transport_header(skb, len_rthdr); 2341 2342 if (skb->len < len_rthdr + 2) 2343 goto fail; 2344 2345 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2346 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2347 2348 if (skb->len < len_rthdr + hdrlen) 2349 goto fail; 2350 2351 /* 2352 * Initialize skb->protocol if the injected frame is a data frame 2353 * carrying a rfc1042 header 2354 */ 2355 if (ieee80211_is_data(hdr->frame_control) && 2356 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2357 u8 *payload = (u8 *)hdr + hdrlen; 2358 2359 if (ether_addr_equal(payload, rfc1042_header)) 2360 skb->protocol = cpu_to_be16((payload[6] << 8) | 2361 payload[7]); 2362 } 2363 2364 rcu_read_lock(); 2365 2366 /* 2367 * We process outgoing injected frames that have a local address 2368 * we handle as though they are non-injected frames. 2369 * This code here isn't entirely correct, the local MAC address 2370 * isn't always enough to find the interface to use; for proper 2371 * VLAN support we have an nl80211-based mechanism. 2372 * 2373 * This is necessary, for example, for old hostapd versions that 2374 * don't use nl80211-based management TX/RX. 2375 */ 2376 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2377 if (!ieee80211_sdata_running(tmp_sdata)) 2378 continue; 2379 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2380 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2381 continue; 2382 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2383 sdata = tmp_sdata; 2384 break; 2385 } 2386 } 2387 2388 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2389 if (!chanctx_conf) { 2390 tmp_sdata = rcu_dereference(local->monitor_sdata); 2391 if (tmp_sdata) 2392 chanctx_conf = 2393 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2394 } 2395 2396 if (chanctx_conf) 2397 chandef = &chanctx_conf->def; 2398 else 2399 goto fail_rcu; 2400 2401 /* 2402 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2403 * shouldn't transmit on disabled channels. 2404 */ 2405 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2406 IEEE80211_CHAN_DISABLED)) 2407 goto fail_rcu; 2408 2409 /* 2410 * Frame injection is not allowed if beaconing is not allowed 2411 * or if we need radar detection. Beaconing is usually not allowed when 2412 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2413 * Passive scan is also used in world regulatory domains where 2414 * your country is not known and as such it should be treated as 2415 * NO TX unless the channel is explicitly allowed in which case 2416 * your current regulatory domain would not have the passive scan 2417 * flag. 2418 * 2419 * Since AP mode uses monitor interfaces to inject/TX management 2420 * frames we can make AP mode the exception to this rule once it 2421 * supports radar detection as its implementation can deal with 2422 * radar detection by itself. We can do that later by adding a 2423 * monitor flag interfaces used for AP support. 2424 */ 2425 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2426 sdata->vif.type)) 2427 goto fail_rcu; 2428 2429 info->band = chandef->chan->band; 2430 2431 /* Initialize skb->priority according to frame type and TID class, 2432 * with respect to the sub interface that the frame will actually 2433 * be transmitted on. If the DONT_REORDER flag is set, the original 2434 * skb-priority is preserved to assure frames injected with this 2435 * flag are not reordered relative to each other. 2436 */ 2437 ieee80211_select_queue_80211(sdata, skb, hdr); 2438 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2439 2440 /* 2441 * Process the radiotap header. This will now take into account the 2442 * selected chandef above to accurately set injection rates and 2443 * retransmissions. 2444 */ 2445 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2446 goto fail_rcu; 2447 2448 /* remove the injection radiotap header */ 2449 skb_pull(skb, len_rthdr); 2450 2451 ieee80211_xmit(sdata, NULL, skb); 2452 rcu_read_unlock(); 2453 2454 return NETDEV_TX_OK; 2455 2456 fail_rcu: 2457 rcu_read_unlock(); 2458 fail: 2459 dev_kfree_skb(skb); 2460 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2461 } 2462 2463 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2464 { 2465 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2466 2467 return ethertype == ETH_P_TDLS && 2468 skb->len > 14 && 2469 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2470 } 2471 2472 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2473 struct sk_buff *skb, 2474 struct sta_info **sta_out) 2475 { 2476 struct sta_info *sta; 2477 2478 switch (sdata->vif.type) { 2479 case NL80211_IFTYPE_AP_VLAN: 2480 sta = rcu_dereference(sdata->u.vlan.sta); 2481 if (sta) { 2482 *sta_out = sta; 2483 return 0; 2484 } else if (sdata->wdev.use_4addr) { 2485 return -ENOLINK; 2486 } 2487 fallthrough; 2488 case NL80211_IFTYPE_AP: 2489 case NL80211_IFTYPE_OCB: 2490 case NL80211_IFTYPE_ADHOC: 2491 if (is_multicast_ether_addr(skb->data)) { 2492 *sta_out = ERR_PTR(-ENOENT); 2493 return 0; 2494 } 2495 sta = sta_info_get_bss(sdata, skb->data); 2496 break; 2497 #ifdef CONFIG_MAC80211_MESH 2498 case NL80211_IFTYPE_MESH_POINT: 2499 /* determined much later */ 2500 *sta_out = NULL; 2501 return 0; 2502 #endif 2503 case NL80211_IFTYPE_STATION: 2504 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2505 sta = sta_info_get(sdata, skb->data); 2506 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2507 if (test_sta_flag(sta, 2508 WLAN_STA_TDLS_PEER_AUTH)) { 2509 *sta_out = sta; 2510 return 0; 2511 } 2512 2513 /* 2514 * TDLS link during setup - throw out frames to 2515 * peer. Allow TDLS-setup frames to unauthorized 2516 * peers for the special case of a link teardown 2517 * after a TDLS sta is removed due to being 2518 * unreachable. 2519 */ 2520 if (!ieee80211_is_tdls_setup(skb)) 2521 return -EINVAL; 2522 } 2523 2524 } 2525 2526 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2527 if (!sta) 2528 return -ENOLINK; 2529 break; 2530 default: 2531 return -EINVAL; 2532 } 2533 2534 *sta_out = sta ?: ERR_PTR(-ENOENT); 2535 return 0; 2536 } 2537 2538 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2539 struct sk_buff *skb, 2540 u32 *info_flags, 2541 u64 *cookie) 2542 { 2543 struct sk_buff *ack_skb; 2544 u16 info_id = 0; 2545 2546 if (skb->sk) 2547 ack_skb = skb_clone_sk(skb); 2548 else 2549 ack_skb = skb_clone(skb, GFP_ATOMIC); 2550 2551 if (ack_skb) { 2552 unsigned long flags; 2553 int id; 2554 2555 spin_lock_irqsave(&local->ack_status_lock, flags); 2556 id = idr_alloc(&local->ack_status_frames, ack_skb, 2557 1, 0x2000, GFP_ATOMIC); 2558 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2559 2560 if (id >= 0) { 2561 info_id = id; 2562 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2563 if (cookie) { 2564 *cookie = ieee80211_mgmt_tx_cookie(local); 2565 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2566 } 2567 } else { 2568 kfree_skb(ack_skb); 2569 } 2570 } 2571 2572 return info_id; 2573 } 2574 2575 /** 2576 * ieee80211_build_hdr - build 802.11 header in the given frame 2577 * @sdata: virtual interface to build the header for 2578 * @skb: the skb to build the header in 2579 * @info_flags: skb flags to set 2580 * @sta: the station pointer 2581 * @ctrl_flags: info control flags to set 2582 * @cookie: cookie pointer to fill (if not %NULL) 2583 * 2584 * This function takes the skb with 802.3 header and reformats the header to 2585 * the appropriate IEEE 802.11 header based on which interface the packet is 2586 * being transmitted on. 2587 * 2588 * Note that this function also takes care of the TX status request and 2589 * potential unsharing of the SKB - this needs to be interleaved with the 2590 * header building. 2591 * 2592 * The function requires the read-side RCU lock held 2593 * 2594 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2595 */ 2596 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2597 struct sk_buff *skb, u32 info_flags, 2598 struct sta_info *sta, u32 ctrl_flags, 2599 u64 *cookie) 2600 { 2601 struct ieee80211_local *local = sdata->local; 2602 struct ieee80211_tx_info *info; 2603 int head_need; 2604 u16 ethertype, hdrlen, meshhdrlen = 0; 2605 __le16 fc; 2606 struct ieee80211_hdr hdr; 2607 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2608 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2609 const u8 *encaps_data; 2610 int encaps_len, skip_header_bytes; 2611 bool wme_sta = false, authorized = false; 2612 bool tdls_peer; 2613 bool multicast; 2614 u16 info_id = 0; 2615 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2616 enum nl80211_band band; 2617 int ret; 2618 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2619 2620 if (IS_ERR(sta)) 2621 sta = NULL; 2622 2623 #ifdef CONFIG_MAC80211_DEBUGFS 2624 if (local->force_tx_status) 2625 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2626 #endif 2627 2628 /* convert Ethernet header to proper 802.11 header (based on 2629 * operation mode) */ 2630 ethertype = (skb->data[12] << 8) | skb->data[13]; 2631 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2632 2633 if (!ieee80211_vif_is_mld(&sdata->vif)) 2634 chanctx_conf = 2635 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2636 2637 switch (sdata->vif.type) { 2638 case NL80211_IFTYPE_AP_VLAN: 2639 if (sdata->wdev.use_4addr) { 2640 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2641 /* RA TA DA SA */ 2642 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2643 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2644 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2645 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2646 hdrlen = 30; 2647 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2648 wme_sta = sta->sta.wme; 2649 } 2650 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2651 struct ieee80211_sub_if_data *ap_sdata; 2652 2653 /* override chanctx_conf from AP (we don't have one) */ 2654 ap_sdata = container_of(sdata->bss, 2655 struct ieee80211_sub_if_data, 2656 u.ap); 2657 chanctx_conf = 2658 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2659 } 2660 if (sdata->wdev.use_4addr) 2661 break; 2662 fallthrough; 2663 case NL80211_IFTYPE_AP: 2664 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2665 /* DA BSSID SA */ 2666 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2667 2668 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2669 struct ieee80211_link_data *link; 2670 2671 link_id = sta->deflink.link_id; 2672 link = rcu_dereference(sdata->link[link_id]); 2673 if (WARN_ON(!link)) { 2674 ret = -ENOLINK; 2675 goto free; 2676 } 2677 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2678 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2679 (sta && sta->sta.mlo)) { 2680 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2681 } else { 2682 struct ieee80211_bss_conf *conf; 2683 2684 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2685 if (unlikely(!conf)) { 2686 ret = -ENOLINK; 2687 goto free; 2688 } 2689 2690 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2691 } 2692 2693 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2694 hdrlen = 24; 2695 break; 2696 #ifdef CONFIG_MAC80211_MESH 2697 case NL80211_IFTYPE_MESH_POINT: 2698 if (!is_multicast_ether_addr(skb->data)) { 2699 struct sta_info *next_hop; 2700 bool mpp_lookup = true; 2701 2702 mpath = mesh_path_lookup(sdata, skb->data); 2703 if (mpath) { 2704 mpp_lookup = false; 2705 next_hop = rcu_dereference(mpath->next_hop); 2706 if (!next_hop || 2707 !(mpath->flags & (MESH_PATH_ACTIVE | 2708 MESH_PATH_RESOLVING))) 2709 mpp_lookup = true; 2710 } 2711 2712 if (mpp_lookup) { 2713 mppath = mpp_path_lookup(sdata, skb->data); 2714 if (mppath) 2715 mppath->exp_time = jiffies; 2716 } 2717 2718 if (mppath && mpath) 2719 mesh_path_del(sdata, mpath->dst); 2720 } 2721 2722 /* 2723 * Use address extension if it is a packet from 2724 * another interface or if we know the destination 2725 * is being proxied by a portal (i.e. portal address 2726 * differs from proxied address) 2727 */ 2728 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2729 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2730 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2731 skb->data, skb->data + ETH_ALEN); 2732 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2733 NULL, NULL); 2734 } else { 2735 /* DS -> MBSS (802.11-2012 13.11.3.3). 2736 * For unicast with unknown forwarding information, 2737 * destination might be in the MBSS or if that fails 2738 * forwarded to another mesh gate. In either case 2739 * resolution will be handled in ieee80211_xmit(), so 2740 * leave the original DA. This also works for mcast */ 2741 const u8 *mesh_da = skb->data; 2742 2743 if (mppath) 2744 mesh_da = mppath->mpp; 2745 else if (mpath) 2746 mesh_da = mpath->dst; 2747 2748 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2749 mesh_da, sdata->vif.addr); 2750 if (is_multicast_ether_addr(mesh_da)) 2751 /* DA TA mSA AE:SA */ 2752 meshhdrlen = ieee80211_new_mesh_header( 2753 sdata, &mesh_hdr, 2754 skb->data + ETH_ALEN, NULL); 2755 else 2756 /* RA TA mDA mSA AE:DA SA */ 2757 meshhdrlen = ieee80211_new_mesh_header( 2758 sdata, &mesh_hdr, skb->data, 2759 skb->data + ETH_ALEN); 2760 2761 } 2762 2763 /* For injected frames, fill RA right away as nexthop lookup 2764 * will be skipped. 2765 */ 2766 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2767 is_zero_ether_addr(hdr.addr1)) 2768 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2769 break; 2770 #endif 2771 case NL80211_IFTYPE_STATION: 2772 /* we already did checks when looking up the RA STA */ 2773 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2774 2775 if (tdls_peer) { 2776 /* For TDLS only one link can be valid with peer STA */ 2777 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2778 struct ieee80211_link_data *link; 2779 2780 /* DA SA BSSID */ 2781 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2782 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2783 link = rcu_dereference(sdata->link[tdls_link_id]); 2784 if (WARN_ON_ONCE(!link)) { 2785 ret = -EINVAL; 2786 goto free; 2787 } 2788 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2789 hdrlen = 24; 2790 } else if (sdata->u.mgd.use_4addr && 2791 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2792 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2793 IEEE80211_FCTL_TODS); 2794 /* RA TA DA SA */ 2795 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2796 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2797 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2798 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2799 hdrlen = 30; 2800 } else { 2801 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2802 /* BSSID SA DA */ 2803 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2804 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2805 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2806 hdrlen = 24; 2807 } 2808 break; 2809 case NL80211_IFTYPE_OCB: 2810 /* DA SA BSSID */ 2811 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2812 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2813 eth_broadcast_addr(hdr.addr3); 2814 hdrlen = 24; 2815 break; 2816 case NL80211_IFTYPE_ADHOC: 2817 /* DA SA BSSID */ 2818 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2819 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2820 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2821 hdrlen = 24; 2822 break; 2823 default: 2824 ret = -EINVAL; 2825 goto free; 2826 } 2827 2828 if (!chanctx_conf) { 2829 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2830 ret = -ENOTCONN; 2831 goto free; 2832 } 2833 /* MLD transmissions must not rely on the band */ 2834 band = 0; 2835 } else { 2836 band = chanctx_conf->def.chan->band; 2837 } 2838 2839 multicast = is_multicast_ether_addr(hdr.addr1); 2840 2841 /* sta is always NULL for mesh */ 2842 if (sta) { 2843 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2844 wme_sta = sta->sta.wme; 2845 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2846 /* For mesh, the use of the QoS header is mandatory */ 2847 wme_sta = true; 2848 } 2849 2850 /* receiver does QoS (which also means we do) use it */ 2851 if (wme_sta) { 2852 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2853 hdrlen += 2; 2854 } 2855 2856 /* 2857 * Drop unicast frames to unauthorised stations unless they are 2858 * EAPOL frames from the local station. 2859 */ 2860 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2861 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2862 !multicast && !authorized && 2863 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2864 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2865 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2866 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2867 sdata->name, hdr.addr1); 2868 #endif 2869 2870 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2871 2872 ret = -EPERM; 2873 goto free; 2874 } 2875 2876 if (unlikely(!multicast && 2877 (sk_requests_wifi_status(skb->sk) || 2878 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2879 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2880 cookie); 2881 2882 /* 2883 * If the skb is shared we need to obtain our own copy. 2884 */ 2885 skb = skb_share_check(skb, GFP_ATOMIC); 2886 if (unlikely(!skb)) { 2887 ret = -ENOMEM; 2888 goto free; 2889 } 2890 2891 hdr.frame_control = fc; 2892 hdr.duration_id = 0; 2893 hdr.seq_ctrl = 0; 2894 2895 skip_header_bytes = ETH_HLEN; 2896 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2897 encaps_data = bridge_tunnel_header; 2898 encaps_len = sizeof(bridge_tunnel_header); 2899 skip_header_bytes -= 2; 2900 } else if (ethertype >= ETH_P_802_3_MIN) { 2901 encaps_data = rfc1042_header; 2902 encaps_len = sizeof(rfc1042_header); 2903 skip_header_bytes -= 2; 2904 } else { 2905 encaps_data = NULL; 2906 encaps_len = 0; 2907 } 2908 2909 skb_pull(skb, skip_header_bytes); 2910 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2911 2912 /* 2913 * So we need to modify the skb header and hence need a copy of 2914 * that. The head_need variable above doesn't, so far, include 2915 * the needed header space that we don't need right away. If we 2916 * can, then we don't reallocate right now but only after the 2917 * frame arrives at the master device (if it does...) 2918 * 2919 * If we cannot, however, then we will reallocate to include all 2920 * the ever needed space. Also, if we need to reallocate it anyway, 2921 * make it big enough for everything we may ever need. 2922 */ 2923 2924 if (head_need > 0 || skb_cloned(skb)) { 2925 head_need += IEEE80211_ENCRYPT_HEADROOM; 2926 head_need += local->tx_headroom; 2927 head_need = max_t(int, 0, head_need); 2928 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2929 ieee80211_free_txskb(&local->hw, skb); 2930 skb = NULL; 2931 return ERR_PTR(-ENOMEM); 2932 } 2933 } 2934 2935 if (encaps_data) 2936 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2937 2938 #ifdef CONFIG_MAC80211_MESH 2939 if (meshhdrlen > 0) 2940 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2941 #endif 2942 2943 if (ieee80211_is_data_qos(fc)) { 2944 __le16 *qos_control; 2945 2946 qos_control = skb_push(skb, 2); 2947 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2948 /* 2949 * Maybe we could actually set some fields here, for now just 2950 * initialise to zero to indicate no special operation. 2951 */ 2952 *qos_control = 0; 2953 } else 2954 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2955 2956 skb_reset_mac_header(skb); 2957 2958 info = IEEE80211_SKB_CB(skb); 2959 memset(info, 0, sizeof(*info)); 2960 2961 info->flags = info_flags; 2962 if (info_id) { 2963 info->status_data = info_id; 2964 info->status_data_idr = 1; 2965 } 2966 info->band = band; 2967 2968 if (likely(!cookie)) { 2969 ctrl_flags |= u32_encode_bits(link_id, 2970 IEEE80211_TX_CTRL_MLO_LINK); 2971 } else { 2972 unsigned int pre_conf_link_id; 2973 2974 /* 2975 * ctrl_flags already have been set by 2976 * ieee80211_tx_control_port(), here 2977 * we just sanity check that 2978 */ 2979 2980 pre_conf_link_id = u32_get_bits(ctrl_flags, 2981 IEEE80211_TX_CTRL_MLO_LINK); 2982 2983 if (pre_conf_link_id != link_id && 2984 link_id != IEEE80211_LINK_UNSPECIFIED) { 2985 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2986 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2987 sdata->name, hdr.addr1, 2988 pre_conf_link_id, link_id); 2989 #endif 2990 ret = -EINVAL; 2991 goto free; 2992 } 2993 } 2994 2995 info->control.flags = ctrl_flags; 2996 2997 return skb; 2998 free: 2999 kfree_skb(skb); 3000 return ERR_PTR(ret); 3001 } 3002 3003 /* 3004 * fast-xmit overview 3005 * 3006 * The core idea of this fast-xmit is to remove per-packet checks by checking 3007 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3008 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3009 * much less work can be done per packet. For example, fragmentation must be 3010 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3011 * in the code here. 3012 * 3013 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3014 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3015 * 3016 * The most difficult part of this is that when any of these assumptions 3017 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3018 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3019 * since the per-packet code no longer checks the conditions. This is reflected 3020 * by the calls to these functions throughout the rest of the code, and must be 3021 * maintained if any of the TX path checks change. 3022 */ 3023 3024 void ieee80211_check_fast_xmit(struct sta_info *sta) 3025 { 3026 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3027 struct ieee80211_local *local = sta->local; 3028 struct ieee80211_sub_if_data *sdata = sta->sdata; 3029 struct ieee80211_hdr *hdr = (void *)build.hdr; 3030 struct ieee80211_chanctx_conf *chanctx_conf; 3031 __le16 fc; 3032 3033 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3034 return; 3035 3036 if (ieee80211_vif_is_mesh(&sdata->vif)) 3037 mesh_fast_tx_flush_sta(sdata, sta); 3038 3039 /* Locking here protects both the pointer itself, and against concurrent 3040 * invocations winning data access races to, e.g., the key pointer that 3041 * is used. 3042 * Without it, the invocation of this function right after the key 3043 * pointer changes wouldn't be sufficient, as another CPU could access 3044 * the pointer, then stall, and then do the cache update after the CPU 3045 * that invalidated the key. 3046 * With the locking, such scenarios cannot happen as the check for the 3047 * key and the fast-tx assignment are done atomically, so the CPU that 3048 * modifies the key will either wait or other one will see the key 3049 * cleared/changed already. 3050 */ 3051 spin_lock_bh(&sta->lock); 3052 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3053 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3054 sdata->vif.type == NL80211_IFTYPE_STATION) 3055 goto out; 3056 3057 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3058 goto out; 3059 3060 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3061 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3062 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3063 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3064 goto out; 3065 3066 if (sdata->noack_map) 3067 goto out; 3068 3069 /* fast-xmit doesn't handle fragmentation at all */ 3070 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3071 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3072 goto out; 3073 3074 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3075 rcu_read_lock(); 3076 chanctx_conf = 3077 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3078 if (!chanctx_conf) { 3079 rcu_read_unlock(); 3080 goto out; 3081 } 3082 build.band = chanctx_conf->def.chan->band; 3083 rcu_read_unlock(); 3084 } else { 3085 /* MLD transmissions must not rely on the band */ 3086 build.band = 0; 3087 } 3088 3089 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3090 3091 switch (sdata->vif.type) { 3092 case NL80211_IFTYPE_ADHOC: 3093 /* DA SA BSSID */ 3094 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3095 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3096 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3097 build.hdr_len = 24; 3098 break; 3099 case NL80211_IFTYPE_STATION: 3100 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3101 /* For TDLS only one link can be valid with peer STA */ 3102 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3103 struct ieee80211_link_data *link; 3104 3105 /* DA SA BSSID */ 3106 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3107 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3108 rcu_read_lock(); 3109 link = rcu_dereference(sdata->link[tdls_link_id]); 3110 if (!WARN_ON_ONCE(!link)) 3111 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3112 rcu_read_unlock(); 3113 build.hdr_len = 24; 3114 break; 3115 } 3116 3117 if (sdata->u.mgd.use_4addr) { 3118 /* non-regular ethertype cannot use the fastpath */ 3119 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3120 IEEE80211_FCTL_TODS); 3121 /* RA TA DA SA */ 3122 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3123 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3124 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3125 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3126 build.hdr_len = 30; 3127 break; 3128 } 3129 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3130 /* BSSID SA DA */ 3131 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3132 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3133 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3134 build.hdr_len = 24; 3135 break; 3136 case NL80211_IFTYPE_AP_VLAN: 3137 if (sdata->wdev.use_4addr) { 3138 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3139 IEEE80211_FCTL_TODS); 3140 /* RA TA DA SA */ 3141 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3142 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3143 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3144 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3145 build.hdr_len = 30; 3146 break; 3147 } 3148 fallthrough; 3149 case NL80211_IFTYPE_AP: 3150 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3151 /* DA BSSID SA */ 3152 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3153 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3154 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3155 } else { 3156 unsigned int link_id = sta->deflink.link_id; 3157 struct ieee80211_link_data *link; 3158 3159 rcu_read_lock(); 3160 link = rcu_dereference(sdata->link[link_id]); 3161 if (WARN_ON(!link)) { 3162 rcu_read_unlock(); 3163 goto out; 3164 } 3165 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3166 rcu_read_unlock(); 3167 } 3168 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3169 build.hdr_len = 24; 3170 break; 3171 default: 3172 /* not handled on fast-xmit */ 3173 goto out; 3174 } 3175 3176 if (sta->sta.wme) { 3177 build.hdr_len += 2; 3178 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3179 } 3180 3181 /* We store the key here so there's no point in using rcu_dereference() 3182 * but that's fine because the code that changes the pointers will call 3183 * this function after doing so. For a single CPU that would be enough, 3184 * for multiple see the comment above. 3185 */ 3186 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3187 if (!build.key) 3188 build.key = rcu_access_pointer(sdata->default_unicast_key); 3189 if (build.key) { 3190 bool gen_iv, iv_spc, mmic; 3191 3192 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3193 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3194 mmic = build.key->conf.flags & 3195 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3196 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3197 3198 /* don't handle software crypto */ 3199 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3200 goto out; 3201 3202 /* Key is being removed */ 3203 if (build.key->flags & KEY_FLAG_TAINTED) 3204 goto out; 3205 3206 switch (build.key->conf.cipher) { 3207 case WLAN_CIPHER_SUITE_CCMP: 3208 case WLAN_CIPHER_SUITE_CCMP_256: 3209 if (gen_iv) 3210 build.pn_offs = build.hdr_len; 3211 if (gen_iv || iv_spc) 3212 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3213 break; 3214 case WLAN_CIPHER_SUITE_GCMP: 3215 case WLAN_CIPHER_SUITE_GCMP_256: 3216 if (gen_iv) 3217 build.pn_offs = build.hdr_len; 3218 if (gen_iv || iv_spc) 3219 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3220 break; 3221 case WLAN_CIPHER_SUITE_TKIP: 3222 /* cannot handle MMIC or IV generation in xmit-fast */ 3223 if (mmic || gen_iv) 3224 goto out; 3225 if (iv_spc) 3226 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3227 break; 3228 case WLAN_CIPHER_SUITE_WEP40: 3229 case WLAN_CIPHER_SUITE_WEP104: 3230 /* cannot handle IV generation in fast-xmit */ 3231 if (gen_iv) 3232 goto out; 3233 if (iv_spc) 3234 build.hdr_len += IEEE80211_WEP_IV_LEN; 3235 break; 3236 case WLAN_CIPHER_SUITE_AES_CMAC: 3237 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3238 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3239 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3240 WARN(1, 3241 "management cipher suite 0x%x enabled for data\n", 3242 build.key->conf.cipher); 3243 goto out; 3244 default: 3245 /* we don't know how to generate IVs for this at all */ 3246 if (WARN_ON(gen_iv)) 3247 goto out; 3248 } 3249 3250 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3251 } 3252 3253 hdr->frame_control = fc; 3254 3255 memcpy(build.hdr + build.hdr_len, 3256 rfc1042_header, sizeof(rfc1042_header)); 3257 build.hdr_len += sizeof(rfc1042_header); 3258 3259 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3260 /* if the kmemdup fails, continue w/o fast_tx */ 3261 3262 out: 3263 /* we might have raced against another call to this function */ 3264 old = rcu_dereference_protected(sta->fast_tx, 3265 lockdep_is_held(&sta->lock)); 3266 rcu_assign_pointer(sta->fast_tx, fast_tx); 3267 if (old) 3268 kfree_rcu(old, rcu_head); 3269 spin_unlock_bh(&sta->lock); 3270 } 3271 3272 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3273 { 3274 struct sta_info *sta; 3275 3276 rcu_read_lock(); 3277 list_for_each_entry_rcu(sta, &local->sta_list, list) 3278 ieee80211_check_fast_xmit(sta); 3279 rcu_read_unlock(); 3280 } 3281 3282 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3283 { 3284 struct ieee80211_local *local = sdata->local; 3285 struct sta_info *sta; 3286 3287 rcu_read_lock(); 3288 3289 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3290 if (sdata != sta->sdata && 3291 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3292 continue; 3293 ieee80211_check_fast_xmit(sta); 3294 } 3295 3296 rcu_read_unlock(); 3297 } 3298 3299 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3300 { 3301 struct ieee80211_fast_tx *fast_tx; 3302 3303 spin_lock_bh(&sta->lock); 3304 fast_tx = rcu_dereference_protected(sta->fast_tx, 3305 lockdep_is_held(&sta->lock)); 3306 RCU_INIT_POINTER(sta->fast_tx, NULL); 3307 spin_unlock_bh(&sta->lock); 3308 3309 if (fast_tx) 3310 kfree_rcu(fast_tx, rcu_head); 3311 } 3312 3313 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3314 struct sk_buff *skb, int headroom) 3315 { 3316 if (skb_headroom(skb) < headroom) { 3317 I802_DEBUG_INC(local->tx_expand_skb_head); 3318 3319 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3320 wiphy_debug(local->hw.wiphy, 3321 "failed to reallocate TX buffer\n"); 3322 return false; 3323 } 3324 } 3325 3326 return true; 3327 } 3328 3329 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3330 struct ieee80211_fast_tx *fast_tx, 3331 struct sk_buff *skb) 3332 { 3333 struct ieee80211_local *local = sdata->local; 3334 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3335 struct ieee80211_hdr *hdr; 3336 struct ethhdr *amsdu_hdr; 3337 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3338 int subframe_len = skb->len - hdr_len; 3339 void *data; 3340 u8 *qc, *h_80211_src, *h_80211_dst; 3341 const u8 *bssid; 3342 3343 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3344 return false; 3345 3346 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3347 return true; 3348 3349 if (!ieee80211_amsdu_realloc_pad(local, skb, 3350 sizeof(*amsdu_hdr) + 3351 local->hw.extra_tx_headroom)) 3352 return false; 3353 3354 data = skb_push(skb, sizeof(*amsdu_hdr)); 3355 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3356 hdr = data; 3357 amsdu_hdr = data + hdr_len; 3358 /* h_80211_src/dst is addr* field within hdr */ 3359 h_80211_src = data + fast_tx->sa_offs; 3360 h_80211_dst = data + fast_tx->da_offs; 3361 3362 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3363 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3364 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3365 3366 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3367 * fields needs to be changed to BSSID for A-MSDU frames depending 3368 * on FromDS/ToDS values. 3369 */ 3370 switch (sdata->vif.type) { 3371 case NL80211_IFTYPE_STATION: 3372 bssid = sdata->vif.cfg.ap_addr; 3373 break; 3374 case NL80211_IFTYPE_AP: 3375 case NL80211_IFTYPE_AP_VLAN: 3376 bssid = sdata->vif.addr; 3377 break; 3378 default: 3379 bssid = NULL; 3380 } 3381 3382 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3383 ether_addr_copy(h_80211_src, bssid); 3384 3385 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3386 ether_addr_copy(h_80211_dst, bssid); 3387 3388 qc = ieee80211_get_qos_ctl(hdr); 3389 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3390 3391 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3392 3393 return true; 3394 } 3395 3396 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3397 struct sta_info *sta, 3398 struct ieee80211_fast_tx *fast_tx, 3399 struct sk_buff *skb, 3400 const u8 *da, const u8 *sa) 3401 { 3402 struct ieee80211_local *local = sdata->local; 3403 struct fq *fq = &local->fq; 3404 struct fq_tin *tin; 3405 struct fq_flow *flow; 3406 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3407 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3408 struct txq_info *txqi; 3409 struct sk_buff **frag_tail, *head; 3410 int subframe_len = skb->len - ETH_ALEN; 3411 u8 max_subframes = sta->sta.max_amsdu_subframes; 3412 int max_frags = local->hw.max_tx_fragments; 3413 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3414 int orig_truesize; 3415 u32 flow_idx; 3416 __be16 len; 3417 void *data; 3418 bool ret = false; 3419 unsigned int orig_len; 3420 int n = 2, nfrags, pad = 0; 3421 u16 hdrlen; 3422 3423 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3424 return false; 3425 3426 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3427 return false; 3428 3429 if (ieee80211_vif_is_mesh(&sdata->vif)) 3430 return false; 3431 3432 if (skb_is_gso(skb)) 3433 return false; 3434 3435 if (!txq) 3436 return false; 3437 3438 txqi = to_txq_info(txq); 3439 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3440 return false; 3441 3442 if (sta->sta.cur->max_rc_amsdu_len) 3443 max_amsdu_len = min_t(int, max_amsdu_len, 3444 sta->sta.cur->max_rc_amsdu_len); 3445 3446 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3447 max_amsdu_len = min_t(int, max_amsdu_len, 3448 sta->sta.cur->max_tid_amsdu_len[tid]); 3449 3450 flow_idx = fq_flow_idx(fq, skb); 3451 3452 spin_lock_bh(&fq->lock); 3453 3454 /* TODO: Ideally aggregation should be done on dequeue to remain 3455 * responsive to environment changes. 3456 */ 3457 3458 tin = &txqi->tin; 3459 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3460 head = skb_peek_tail(&flow->queue); 3461 if (!head || skb_is_gso(head)) 3462 goto out; 3463 3464 orig_truesize = head->truesize; 3465 orig_len = head->len; 3466 3467 if (skb->len + head->len > max_amsdu_len) 3468 goto out; 3469 3470 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3471 nfrags += 1 + skb_shinfo(head)->nr_frags; 3472 frag_tail = &skb_shinfo(head)->frag_list; 3473 while (*frag_tail) { 3474 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3475 frag_tail = &(*frag_tail)->next; 3476 n++; 3477 } 3478 3479 if (max_subframes && n > max_subframes) 3480 goto out; 3481 3482 if (max_frags && nfrags > max_frags) 3483 goto out; 3484 3485 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3486 goto out; 3487 3488 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3489 goto out; 3490 3491 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3492 * and frag_tail should be &skb_shinfo(head)->frag_list. 3493 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3494 * Reload frag_tail to have it pointing to the correct place. 3495 */ 3496 if (n == 2) 3497 frag_tail = &skb_shinfo(head)->frag_list; 3498 3499 /* 3500 * Pad out the previous subframe to a multiple of 4 by adding the 3501 * padding to the next one, that's being added. Note that head->len 3502 * is the length of the full A-MSDU, but that works since each time 3503 * we add a new subframe we pad out the previous one to a multiple 3504 * of 4 and thus it no longer matters in the next round. 3505 */ 3506 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3507 if ((head->len - hdrlen) & 3) 3508 pad = 4 - ((head->len - hdrlen) & 3); 3509 3510 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3511 2 + pad)) 3512 goto out_recalc; 3513 3514 ret = true; 3515 data = skb_push(skb, ETH_ALEN + 2); 3516 ether_addr_copy(data, da); 3517 ether_addr_copy(data + ETH_ALEN, sa); 3518 3519 data += 2 * ETH_ALEN; 3520 len = cpu_to_be16(subframe_len); 3521 memcpy(data, &len, 2); 3522 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3523 3524 memset(skb_push(skb, pad), 0, pad); 3525 3526 head->len += skb->len; 3527 head->data_len += skb->len; 3528 *frag_tail = skb; 3529 3530 out_recalc: 3531 fq->memory_usage += head->truesize - orig_truesize; 3532 if (head->len != orig_len) { 3533 flow->backlog += head->len - orig_len; 3534 tin->backlog_bytes += head->len - orig_len; 3535 } 3536 out: 3537 spin_unlock_bh(&fq->lock); 3538 3539 return ret; 3540 } 3541 3542 /* 3543 * Can be called while the sta lock is held. Anything that can cause packets to 3544 * be generated will cause deadlock! 3545 */ 3546 static ieee80211_tx_result 3547 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3548 struct sta_info *sta, u8 pn_offs, 3549 struct ieee80211_key *key, 3550 struct ieee80211_tx_data *tx) 3551 { 3552 struct sk_buff *skb = tx->skb; 3553 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3554 struct ieee80211_hdr *hdr = (void *)skb->data; 3555 u8 tid = IEEE80211_NUM_TIDS; 3556 3557 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3558 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3559 return TX_DROP; 3560 3561 if (key) 3562 info->control.hw_key = &key->conf; 3563 3564 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3565 3566 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3567 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3568 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3569 } else { 3570 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3571 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3572 sdata->sequence_number += 0x10; 3573 } 3574 3575 if (skb_shinfo(skb)->gso_size) 3576 sta->deflink.tx_stats.msdu[tid] += 3577 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3578 else 3579 sta->deflink.tx_stats.msdu[tid]++; 3580 3581 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3582 3583 /* statistics normally done by ieee80211_tx_h_stats (but that 3584 * has to consider fragmentation, so is more complex) 3585 */ 3586 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3587 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3588 3589 if (pn_offs) { 3590 u64 pn; 3591 u8 *crypto_hdr = skb->data + pn_offs; 3592 3593 switch (key->conf.cipher) { 3594 case WLAN_CIPHER_SUITE_CCMP: 3595 case WLAN_CIPHER_SUITE_CCMP_256: 3596 case WLAN_CIPHER_SUITE_GCMP: 3597 case WLAN_CIPHER_SUITE_GCMP_256: 3598 pn = atomic64_inc_return(&key->conf.tx_pn); 3599 crypto_hdr[0] = pn; 3600 crypto_hdr[1] = pn >> 8; 3601 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3602 crypto_hdr[4] = pn >> 16; 3603 crypto_hdr[5] = pn >> 24; 3604 crypto_hdr[6] = pn >> 32; 3605 crypto_hdr[7] = pn >> 40; 3606 break; 3607 } 3608 } 3609 3610 return TX_CONTINUE; 3611 } 3612 3613 static netdev_features_t 3614 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3615 { 3616 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3617 return sdata->vif.netdev_features; 3618 3619 if (!sdata->bss) 3620 return 0; 3621 3622 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3623 return sdata->vif.netdev_features; 3624 } 3625 3626 static struct sk_buff * 3627 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3628 { 3629 if (skb_is_gso(skb)) { 3630 struct sk_buff *segs; 3631 3632 segs = skb_gso_segment(skb, features); 3633 if (!segs) 3634 return skb; 3635 if (IS_ERR(segs)) 3636 goto free; 3637 3638 consume_skb(skb); 3639 return segs; 3640 } 3641 3642 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3643 goto free; 3644 3645 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3646 int ofs = skb_checksum_start_offset(skb); 3647 3648 if (skb->encapsulation) 3649 skb_set_inner_transport_header(skb, ofs); 3650 else 3651 skb_set_transport_header(skb, ofs); 3652 3653 if (skb_csum_hwoffload_help(skb, features)) 3654 goto free; 3655 } 3656 3657 skb_mark_not_on_list(skb); 3658 return skb; 3659 3660 free: 3661 kfree_skb(skb); 3662 return NULL; 3663 } 3664 3665 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3666 struct sta_info *sta, 3667 struct ieee80211_fast_tx *fast_tx, 3668 struct sk_buff *skb, bool ampdu, 3669 const u8 *da, const u8 *sa) 3670 { 3671 struct ieee80211_local *local = sdata->local; 3672 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3673 struct ieee80211_tx_info *info; 3674 struct ieee80211_tx_data tx; 3675 ieee80211_tx_result r; 3676 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3677 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3678 3679 skb = skb_share_check(skb, GFP_ATOMIC); 3680 if (unlikely(!skb)) 3681 return; 3682 3683 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3684 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3685 return; 3686 3687 /* will not be crypto-handled beyond what we do here, so use false 3688 * as the may-encrypt argument for the resize to not account for 3689 * more room than we already have in 'extra_head' 3690 */ 3691 if (unlikely(ieee80211_skb_resize(sdata, skb, 3692 max_t(int, extra_head + hw_headroom - 3693 skb_headroom(skb), 0), 3694 ENCRYPT_NO))) 3695 goto free; 3696 3697 hdr = skb_push(skb, extra_head); 3698 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3699 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3700 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3701 3702 info = IEEE80211_SKB_CB(skb); 3703 memset(info, 0, sizeof(*info)); 3704 info->band = fast_tx->band; 3705 info->control.vif = &sdata->vif; 3706 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3707 IEEE80211_TX_CTL_DONTFRAG; 3708 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3709 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3710 IEEE80211_TX_CTRL_MLO_LINK); 3711 3712 #ifdef CONFIG_MAC80211_DEBUGFS 3713 if (local->force_tx_status) 3714 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3715 #endif 3716 3717 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3718 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3719 3720 *ieee80211_get_qos_ctl(hdr) = tid; 3721 } 3722 3723 __skb_queue_head_init(&tx.skbs); 3724 3725 tx.flags = IEEE80211_TX_UNICAST; 3726 tx.local = local; 3727 tx.sdata = sdata; 3728 tx.sta = sta; 3729 tx.key = fast_tx->key; 3730 3731 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3732 return; 3733 3734 tx.skb = skb; 3735 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3736 fast_tx->key, &tx); 3737 tx.skb = NULL; 3738 if (r == TX_DROP) { 3739 tx.sdata->tx_handlers_drop++; 3740 goto free; 3741 } 3742 3743 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3744 sdata = container_of(sdata->bss, 3745 struct ieee80211_sub_if_data, u.ap); 3746 3747 __skb_queue_tail(&tx.skbs, skb); 3748 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3749 return; 3750 3751 free: 3752 kfree_skb(skb); 3753 } 3754 3755 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3756 struct sta_info *sta, 3757 struct ieee80211_fast_tx *fast_tx, 3758 struct sk_buff *skb) 3759 { 3760 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3761 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3762 struct tid_ampdu_tx *tid_tx = NULL; 3763 struct sk_buff *next; 3764 struct ethhdr eth; 3765 u8 tid = IEEE80211_NUM_TIDS; 3766 3767 /* control port protocol needs a lot of special handling */ 3768 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3769 return false; 3770 3771 /* only RFC 1042 SNAP */ 3772 if (ethertype < ETH_P_802_3_MIN) 3773 return false; 3774 3775 /* don't handle TX status request here either */ 3776 if (sk_requests_wifi_status(skb->sk)) 3777 return false; 3778 3779 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3780 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3781 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3782 if (tid_tx) { 3783 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3784 return false; 3785 if (tid_tx->timeout) 3786 tid_tx->last_tx = jiffies; 3787 } 3788 } 3789 3790 memcpy(ð, skb->data, ETH_HLEN - 2); 3791 3792 /* after this point (skb is modified) we cannot return false */ 3793 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3794 if (!skb) 3795 return true; 3796 3797 skb_list_walk_safe(skb, skb, next) { 3798 skb_mark_not_on_list(skb); 3799 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3800 eth.h_dest, eth.h_source); 3801 } 3802 3803 return true; 3804 } 3805 3806 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3807 struct ieee80211_txq *txq) 3808 { 3809 struct ieee80211_local *local = hw_to_local(hw); 3810 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3811 struct ieee80211_hdr *hdr; 3812 struct sk_buff *skb = NULL; 3813 struct fq *fq = &local->fq; 3814 struct fq_tin *tin = &txqi->tin; 3815 struct ieee80211_tx_info *info; 3816 struct ieee80211_tx_data tx; 3817 ieee80211_tx_result r; 3818 struct ieee80211_vif *vif = txq->vif; 3819 int q = vif->hw_queue[txq->ac]; 3820 unsigned long flags; 3821 bool q_stopped; 3822 3823 WARN_ON_ONCE(softirq_count() == 0); 3824 3825 if (!ieee80211_txq_airtime_check(hw, txq)) 3826 return NULL; 3827 3828 begin: 3829 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3830 q_stopped = local->queue_stop_reasons[q]; 3831 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3832 3833 if (unlikely(q_stopped)) { 3834 /* mark for waking later */ 3835 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3836 return NULL; 3837 } 3838 3839 spin_lock_bh(&fq->lock); 3840 3841 /* Make sure fragments stay together. */ 3842 skb = __skb_dequeue(&txqi->frags); 3843 if (unlikely(skb)) { 3844 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3845 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3846 goto out; 3847 IEEE80211_SKB_CB(skb)->control.flags &= 3848 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3849 } else { 3850 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3851 goto out; 3852 3853 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3854 } 3855 3856 if (!skb) 3857 goto out; 3858 3859 spin_unlock_bh(&fq->lock); 3860 3861 hdr = (struct ieee80211_hdr *)skb->data; 3862 info = IEEE80211_SKB_CB(skb); 3863 3864 memset(&tx, 0, sizeof(tx)); 3865 __skb_queue_head_init(&tx.skbs); 3866 tx.local = local; 3867 tx.skb = skb; 3868 tx.sdata = vif_to_sdata(info->control.vif); 3869 3870 if (txq->sta) { 3871 tx.sta = container_of(txq->sta, struct sta_info, sta); 3872 /* 3873 * Drop unicast frames to unauthorised stations unless they are 3874 * injected frames or EAPOL frames from the local station. 3875 */ 3876 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3877 ieee80211_is_data(hdr->frame_control) && 3878 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3879 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3880 !is_multicast_ether_addr(hdr->addr1) && 3881 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3882 (!(info->control.flags & 3883 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3884 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3885 NULL)))) { 3886 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3887 ieee80211_free_txskb(&local->hw, skb); 3888 goto begin; 3889 } 3890 } 3891 3892 /* 3893 * The key can be removed while the packet was queued, so need to call 3894 * this here to get the current key. 3895 */ 3896 info->control.hw_key = NULL; 3897 r = ieee80211_tx_h_select_key(&tx); 3898 if (r != TX_CONTINUE) { 3899 ieee80211_free_txskb(&local->hw, skb); 3900 goto begin; 3901 } 3902 3903 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3904 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3905 IEEE80211_TX_CTL_DONTFRAG); 3906 3907 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3908 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3909 r = ieee80211_tx_h_rate_ctrl(&tx); 3910 if (r != TX_CONTINUE) { 3911 ieee80211_free_txskb(&local->hw, skb); 3912 goto begin; 3913 } 3914 } 3915 goto encap_out; 3916 } 3917 3918 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3919 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3920 sta); 3921 u8 pn_offs = 0; 3922 3923 if (tx.key && 3924 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3925 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3926 3927 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3928 tx.key, &tx); 3929 if (r != TX_CONTINUE) { 3930 ieee80211_free_txskb(&local->hw, skb); 3931 goto begin; 3932 } 3933 } else { 3934 if (invoke_tx_handlers_late(&tx)) 3935 goto begin; 3936 3937 skb = __skb_dequeue(&tx.skbs); 3938 info = IEEE80211_SKB_CB(skb); 3939 3940 if (!skb_queue_empty(&tx.skbs)) { 3941 spin_lock_bh(&fq->lock); 3942 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3943 spin_unlock_bh(&fq->lock); 3944 } 3945 } 3946 3947 if (skb_has_frag_list(skb) && 3948 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3949 if (skb_linearize(skb)) { 3950 ieee80211_free_txskb(&local->hw, skb); 3951 goto begin; 3952 } 3953 } 3954 3955 switch (tx.sdata->vif.type) { 3956 case NL80211_IFTYPE_MONITOR: 3957 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 3958 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 3959 vif = &tx.sdata->vif; 3960 break; 3961 } 3962 tx.sdata = rcu_dereference(local->monitor_sdata); 3963 if (tx.sdata && 3964 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 3965 vif = &tx.sdata->vif; 3966 info->hw_queue = 3967 vif->hw_queue[skb_get_queue_mapping(skb)]; 3968 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3969 ieee80211_free_txskb(&local->hw, skb); 3970 goto begin; 3971 } else { 3972 info->control.vif = NULL; 3973 return skb; 3974 } 3975 break; 3976 case NL80211_IFTYPE_AP_VLAN: 3977 tx.sdata = container_of(tx.sdata->bss, 3978 struct ieee80211_sub_if_data, u.ap); 3979 fallthrough; 3980 default: 3981 vif = &tx.sdata->vif; 3982 break; 3983 } 3984 3985 encap_out: 3986 info->control.vif = vif; 3987 3988 if (tx.sta && 3989 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3990 bool ampdu = txq->ac != IEEE80211_AC_VO; 3991 u32 airtime; 3992 3993 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3994 skb->len, ampdu); 3995 if (airtime) { 3996 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3997 ieee80211_sta_update_pending_airtime(local, tx.sta, 3998 txq->ac, 3999 airtime, 4000 false); 4001 } 4002 } 4003 4004 return skb; 4005 4006 out: 4007 spin_unlock_bh(&fq->lock); 4008 4009 return skb; 4010 } 4011 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4012 4013 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4014 { 4015 struct airtime_info *air_info = &sta->airtime[ac]; 4016 4017 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4018 } 4019 4020 static void 4021 ieee80211_txq_set_active(struct txq_info *txqi) 4022 { 4023 struct sta_info *sta; 4024 4025 if (!txqi->txq.sta) 4026 return; 4027 4028 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4029 sta->airtime[txqi->txq.ac].last_active = jiffies; 4030 } 4031 4032 static bool 4033 ieee80211_txq_keep_active(struct txq_info *txqi) 4034 { 4035 struct sta_info *sta; 4036 4037 if (!txqi->txq.sta) 4038 return false; 4039 4040 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4041 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4042 return false; 4043 4044 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4045 } 4046 4047 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4048 { 4049 struct ieee80211_local *local = hw_to_local(hw); 4050 struct ieee80211_txq *ret = NULL; 4051 struct txq_info *txqi = NULL, *head = NULL; 4052 bool found_eligible_txq = false; 4053 4054 spin_lock_bh(&local->active_txq_lock[ac]); 4055 4056 if (!local->schedule_round[ac]) 4057 goto out; 4058 4059 begin: 4060 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4061 struct txq_info, 4062 schedule_order); 4063 if (!txqi) 4064 goto out; 4065 4066 if (txqi == head) { 4067 if (!found_eligible_txq) 4068 goto out; 4069 else 4070 found_eligible_txq = false; 4071 } 4072 4073 if (!head) 4074 head = txqi; 4075 4076 if (txqi->txq.sta) { 4077 struct sta_info *sta = container_of(txqi->txq.sta, 4078 struct sta_info, sta); 4079 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4080 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4081 4082 if (aql_check) 4083 found_eligible_txq = true; 4084 4085 if (deficit < 0) 4086 sta->airtime[txqi->txq.ac].deficit += 4087 sta->airtime_weight; 4088 4089 if (deficit < 0 || !aql_check) { 4090 list_move_tail(&txqi->schedule_order, 4091 &local->active_txqs[txqi->txq.ac]); 4092 goto begin; 4093 } 4094 } 4095 4096 if (txqi->schedule_round == local->schedule_round[ac]) 4097 goto out; 4098 4099 list_del_init(&txqi->schedule_order); 4100 txqi->schedule_round = local->schedule_round[ac]; 4101 ret = &txqi->txq; 4102 4103 out: 4104 spin_unlock_bh(&local->active_txq_lock[ac]); 4105 return ret; 4106 } 4107 EXPORT_SYMBOL(ieee80211_next_txq); 4108 4109 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4110 struct ieee80211_txq *txq, 4111 bool force) 4112 { 4113 struct ieee80211_local *local = hw_to_local(hw); 4114 struct txq_info *txqi = to_txq_info(txq); 4115 bool has_queue; 4116 4117 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4118 4119 has_queue = force || 4120 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4121 txq_has_queue(txq)); 4122 if (list_empty(&txqi->schedule_order) && 4123 (has_queue || ieee80211_txq_keep_active(txqi))) { 4124 /* If airtime accounting is active, always enqueue STAs at the 4125 * head of the list to ensure that they only get moved to the 4126 * back by the airtime DRR scheduler once they have a negative 4127 * deficit. A station that already has a negative deficit will 4128 * get immediately moved to the back of the list on the next 4129 * call to ieee80211_next_txq(). 4130 */ 4131 if (txqi->txq.sta && local->airtime_flags && has_queue && 4132 wiphy_ext_feature_isset(local->hw.wiphy, 4133 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4134 list_add(&txqi->schedule_order, 4135 &local->active_txqs[txq->ac]); 4136 else 4137 list_add_tail(&txqi->schedule_order, 4138 &local->active_txqs[txq->ac]); 4139 if (has_queue) 4140 ieee80211_txq_set_active(txqi); 4141 } 4142 4143 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4144 } 4145 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4146 4147 DEFINE_STATIC_KEY_FALSE(aql_disable); 4148 4149 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4150 struct ieee80211_txq *txq) 4151 { 4152 struct sta_info *sta; 4153 struct ieee80211_local *local = hw_to_local(hw); 4154 4155 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4156 return true; 4157 4158 if (static_branch_unlikely(&aql_disable)) 4159 return true; 4160 4161 if (!txq->sta) 4162 return true; 4163 4164 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4165 return true; 4166 4167 sta = container_of(txq->sta, struct sta_info, sta); 4168 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4169 sta->airtime[txq->ac].aql_limit_low) 4170 return true; 4171 4172 if (atomic_read(&local->aql_total_pending_airtime) < 4173 local->aql_threshold && 4174 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4175 sta->airtime[txq->ac].aql_limit_high) 4176 return true; 4177 4178 return false; 4179 } 4180 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4181 4182 static bool 4183 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4184 { 4185 unsigned int num_txq = 0; 4186 struct txq_info *txq; 4187 u32 aql_limit; 4188 4189 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4190 return true; 4191 4192 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4193 num_txq++; 4194 4195 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4196 local->aql_txq_limit_high[ac]; 4197 4198 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4199 } 4200 4201 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4202 struct ieee80211_txq *txq) 4203 { 4204 struct ieee80211_local *local = hw_to_local(hw); 4205 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4206 struct sta_info *sta; 4207 u8 ac = txq->ac; 4208 4209 spin_lock_bh(&local->active_txq_lock[ac]); 4210 4211 if (!txqi->txq.sta) 4212 goto out; 4213 4214 if (list_empty(&txqi->schedule_order)) 4215 goto out; 4216 4217 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4218 goto out; 4219 4220 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4221 schedule_order) { 4222 if (iter == txqi) 4223 break; 4224 4225 if (!iter->txq.sta) { 4226 list_move_tail(&iter->schedule_order, 4227 &local->active_txqs[ac]); 4228 continue; 4229 } 4230 sta = container_of(iter->txq.sta, struct sta_info, sta); 4231 if (ieee80211_sta_deficit(sta, ac) < 0) 4232 sta->airtime[ac].deficit += sta->airtime_weight; 4233 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4234 } 4235 4236 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4237 if (sta->airtime[ac].deficit >= 0) 4238 goto out; 4239 4240 sta->airtime[ac].deficit += sta->airtime_weight; 4241 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4242 spin_unlock_bh(&local->active_txq_lock[ac]); 4243 4244 return false; 4245 out: 4246 if (!list_empty(&txqi->schedule_order)) 4247 list_del_init(&txqi->schedule_order); 4248 spin_unlock_bh(&local->active_txq_lock[ac]); 4249 4250 return true; 4251 } 4252 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4253 4254 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4255 { 4256 struct ieee80211_local *local = hw_to_local(hw); 4257 4258 spin_lock_bh(&local->active_txq_lock[ac]); 4259 4260 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4261 local->schedule_round[ac]++; 4262 if (!local->schedule_round[ac]) 4263 local->schedule_round[ac]++; 4264 } else { 4265 local->schedule_round[ac] = 0; 4266 } 4267 4268 spin_unlock_bh(&local->active_txq_lock[ac]); 4269 } 4270 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4271 4272 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4273 struct net_device *dev, 4274 u32 info_flags, 4275 u32 ctrl_flags, 4276 u64 *cookie) 4277 { 4278 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4279 struct ieee80211_local *local = sdata->local; 4280 struct sta_info *sta; 4281 struct sk_buff *next; 4282 int len = skb->len; 4283 4284 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4285 kfree_skb(skb); 4286 return; 4287 } 4288 4289 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4290 4291 rcu_read_lock(); 4292 4293 if (ieee80211_vif_is_mesh(&sdata->vif) && 4294 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4295 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4296 goto out; 4297 4298 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4299 goto out_free; 4300 4301 if (IS_ERR(sta)) 4302 sta = NULL; 4303 4304 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4305 ieee80211_aggr_check(sdata, sta, skb); 4306 4307 if (sta) { 4308 struct ieee80211_fast_tx *fast_tx; 4309 4310 fast_tx = rcu_dereference(sta->fast_tx); 4311 4312 if (fast_tx && 4313 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4314 goto out; 4315 } 4316 4317 /* the frame could be fragmented, software-encrypted, and other 4318 * things so we cannot really handle checksum or GSO offload. 4319 * fix it up in software before we handle anything else. 4320 */ 4321 skb = ieee80211_tx_skb_fixup(skb, 0); 4322 if (!skb) { 4323 len = 0; 4324 goto out; 4325 } 4326 4327 skb_list_walk_safe(skb, skb, next) { 4328 skb_mark_not_on_list(skb); 4329 4330 if (skb->protocol == sdata->control_port_protocol) 4331 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4332 4333 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4334 sta, ctrl_flags, cookie); 4335 if (IS_ERR(skb)) { 4336 kfree_skb_list(next); 4337 goto out; 4338 } 4339 4340 dev_sw_netstats_tx_add(dev, 1, skb->len); 4341 4342 ieee80211_xmit(sdata, sta, skb); 4343 } 4344 goto out; 4345 out_free: 4346 kfree_skb(skb); 4347 len = 0; 4348 out: 4349 if (len) 4350 ieee80211_tpt_led_trig_tx(local, len); 4351 rcu_read_unlock(); 4352 } 4353 4354 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4355 { 4356 struct ethhdr *eth; 4357 int err; 4358 4359 err = skb_ensure_writable(skb, ETH_HLEN); 4360 if (unlikely(err)) 4361 return err; 4362 4363 eth = (void *)skb->data; 4364 ether_addr_copy(eth->h_dest, sta->sta.addr); 4365 4366 return 0; 4367 } 4368 4369 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4370 struct net_device *dev) 4371 { 4372 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4373 const struct ethhdr *eth = (void *)skb->data; 4374 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4375 __be16 ethertype; 4376 4377 switch (sdata->vif.type) { 4378 case NL80211_IFTYPE_AP_VLAN: 4379 if (sdata->u.vlan.sta) 4380 return false; 4381 if (sdata->wdev.use_4addr) 4382 return false; 4383 fallthrough; 4384 case NL80211_IFTYPE_AP: 4385 /* check runtime toggle for this bss */ 4386 if (!sdata->bss->multicast_to_unicast) 4387 return false; 4388 break; 4389 default: 4390 return false; 4391 } 4392 4393 /* multicast to unicast conversion only for some payload */ 4394 ethertype = eth->h_proto; 4395 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4396 ethertype = ethvlan->h_vlan_encapsulated_proto; 4397 switch (ethertype) { 4398 case htons(ETH_P_ARP): 4399 case htons(ETH_P_IP): 4400 case htons(ETH_P_IPV6): 4401 break; 4402 default: 4403 return false; 4404 } 4405 4406 return true; 4407 } 4408 4409 static void 4410 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4411 struct sk_buff_head *queue) 4412 { 4413 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4414 struct ieee80211_local *local = sdata->local; 4415 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4416 struct sta_info *sta, *first = NULL; 4417 struct sk_buff *cloned_skb; 4418 4419 rcu_read_lock(); 4420 4421 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4422 if (sdata != sta->sdata) 4423 /* AP-VLAN mismatch */ 4424 continue; 4425 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4426 /* do not send back to source */ 4427 continue; 4428 if (!first) { 4429 first = sta; 4430 continue; 4431 } 4432 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4433 if (!cloned_skb) 4434 goto multicast; 4435 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4436 dev_kfree_skb(cloned_skb); 4437 goto multicast; 4438 } 4439 __skb_queue_tail(queue, cloned_skb); 4440 } 4441 4442 if (likely(first)) { 4443 if (unlikely(ieee80211_change_da(skb, first))) 4444 goto multicast; 4445 __skb_queue_tail(queue, skb); 4446 } else { 4447 /* no STA connected, drop */ 4448 kfree_skb(skb); 4449 skb = NULL; 4450 } 4451 4452 goto out; 4453 multicast: 4454 __skb_queue_purge(queue); 4455 __skb_queue_tail(queue, skb); 4456 out: 4457 rcu_read_unlock(); 4458 } 4459 4460 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4461 struct sk_buff *skb, u32 ctrl_flags, 4462 unsigned int link_id) 4463 { 4464 struct sk_buff *out; 4465 4466 out = skb_copy(skb, GFP_ATOMIC); 4467 if (!out) 4468 return; 4469 4470 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4471 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4472 } 4473 4474 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4475 struct sk_buff *skb) 4476 { 4477 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4478 unsigned long links = sdata->vif.active_links; 4479 unsigned int link; 4480 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4481 4482 if (hweight16(links) == 1) { 4483 ctrl_flags |= u32_encode_bits(__ffs(links), 4484 IEEE80211_TX_CTRL_MLO_LINK); 4485 4486 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4487 NULL); 4488 return; 4489 } 4490 4491 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4492 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4493 ctrl_flags = 0; 4494 } 4495 kfree_skb(skb); 4496 } 4497 4498 /** 4499 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4500 * @skb: packet to be sent 4501 * @dev: incoming interface 4502 * 4503 * On failure skb will be freed. 4504 * 4505 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4506 */ 4507 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4508 struct net_device *dev) 4509 { 4510 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4511 const struct ethhdr *eth = (void *)skb->data; 4512 4513 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4514 goto normal; 4515 4516 if (unlikely(!ieee80211_sdata_running(sdata))) { 4517 kfree_skb(skb); 4518 return NETDEV_TX_OK; 4519 } 4520 4521 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4522 struct sk_buff_head queue; 4523 4524 __skb_queue_head_init(&queue); 4525 ieee80211_convert_to_unicast(skb, dev, &queue); 4526 while ((skb = __skb_dequeue(&queue))) 4527 __ieee80211_subif_start_xmit(skb, dev, 0, 4528 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4529 NULL); 4530 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4531 ((sdata->vif.type == NL80211_IFTYPE_AP && 4532 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4533 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4534 !sdata->wdev.use_4addr))) { 4535 ieee80211_mlo_multicast_tx(dev, skb); 4536 } else { 4537 normal: 4538 __ieee80211_subif_start_xmit(skb, dev, 0, 4539 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4540 NULL); 4541 } 4542 4543 return NETDEV_TX_OK; 4544 } 4545 4546 4547 4548 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4549 struct sk_buff *skb, struct sta_info *sta, 4550 bool txpending) 4551 { 4552 struct ieee80211_local *local = sdata->local; 4553 struct ieee80211_tx_control control = {}; 4554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4555 struct ieee80211_sta *pubsta = NULL; 4556 unsigned long flags; 4557 int q = info->hw_queue; 4558 4559 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4560 4561 if (local->queue_stop_reasons[q] || 4562 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4563 if (txpending) 4564 skb_queue_head(&local->pending[q], skb); 4565 else 4566 skb_queue_tail(&local->pending[q], skb); 4567 4568 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4569 4570 return false; 4571 } 4572 4573 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4574 4575 if (sta && sta->uploaded) 4576 pubsta = &sta->sta; 4577 4578 control.sta = pubsta; 4579 4580 drv_tx(local, &control, skb); 4581 4582 return true; 4583 } 4584 4585 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4586 struct sk_buff *skb, struct sta_info *sta, 4587 bool txpending) 4588 { 4589 struct ieee80211_local *local = sdata->local; 4590 struct sk_buff *next; 4591 bool ret = true; 4592 4593 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4594 return true; 4595 4596 skb_list_walk_safe(skb, skb, next) { 4597 skb_mark_not_on_list(skb); 4598 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4599 ret = false; 4600 } 4601 4602 return ret; 4603 } 4604 4605 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4606 struct net_device *dev, struct sta_info *sta, 4607 struct ieee80211_key *key, struct sk_buff *skb) 4608 { 4609 struct ieee80211_tx_info *info; 4610 struct ieee80211_local *local = sdata->local; 4611 struct tid_ampdu_tx *tid_tx; 4612 struct sk_buff *seg, *next; 4613 unsigned int skbs = 0, len = 0; 4614 u16 queue; 4615 u8 tid; 4616 4617 queue = ieee80211_select_queue(sdata, sta, skb); 4618 skb_set_queue_mapping(skb, queue); 4619 4620 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4621 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4622 goto out_free; 4623 4624 skb = skb_share_check(skb, GFP_ATOMIC); 4625 if (unlikely(!skb)) 4626 return; 4627 4628 ieee80211_aggr_check(sdata, sta, skb); 4629 4630 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4631 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4632 if (tid_tx) { 4633 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4634 /* fall back to non-offload slow path */ 4635 __ieee80211_subif_start_xmit(skb, dev, 0, 4636 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4637 NULL); 4638 return; 4639 } 4640 4641 if (tid_tx->timeout) 4642 tid_tx->last_tx = jiffies; 4643 } 4644 4645 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4646 if (!skb) 4647 return; 4648 4649 info = IEEE80211_SKB_CB(skb); 4650 memset(info, 0, sizeof(*info)); 4651 4652 info->hw_queue = sdata->vif.hw_queue[queue]; 4653 4654 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4655 sdata = container_of(sdata->bss, 4656 struct ieee80211_sub_if_data, u.ap); 4657 4658 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4659 info->control.vif = &sdata->vif; 4660 4661 if (key) 4662 info->control.hw_key = &key->conf; 4663 4664 skb_list_walk_safe(skb, seg, next) { 4665 skbs++; 4666 len += seg->len; 4667 if (seg != skb) 4668 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4669 } 4670 4671 if (unlikely(sk_requests_wifi_status(skb->sk))) { 4672 info->status_data = ieee80211_store_ack_skb(local, skb, 4673 &info->flags, NULL); 4674 if (info->status_data) 4675 info->status_data_idr = 1; 4676 } 4677 4678 dev_sw_netstats_tx_add(dev, skbs, len); 4679 sta->deflink.tx_stats.packets[queue] += skbs; 4680 sta->deflink.tx_stats.bytes[queue] += len; 4681 4682 ieee80211_tpt_led_trig_tx(local, len); 4683 4684 ieee80211_tx_8023(sdata, skb, sta, false); 4685 4686 return; 4687 4688 out_free: 4689 kfree_skb(skb); 4690 } 4691 4692 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4693 struct net_device *dev) 4694 { 4695 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4696 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4697 struct ieee80211_key *key; 4698 struct sta_info *sta; 4699 4700 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4701 kfree_skb(skb); 4702 return NETDEV_TX_OK; 4703 } 4704 4705 rcu_read_lock(); 4706 4707 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4708 kfree_skb(skb); 4709 goto out; 4710 } 4711 4712 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4713 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4714 sdata->control_port_protocol == ehdr->h_proto)) 4715 goto skip_offload; 4716 4717 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4718 if (!key) 4719 key = rcu_dereference(sdata->default_unicast_key); 4720 4721 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4722 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4723 goto skip_offload; 4724 4725 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4726 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4727 goto out; 4728 4729 skip_offload: 4730 ieee80211_subif_start_xmit(skb, dev); 4731 out: 4732 rcu_read_unlock(); 4733 4734 return NETDEV_TX_OK; 4735 } 4736 4737 struct sk_buff * 4738 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4739 struct sk_buff *skb, u32 info_flags) 4740 { 4741 struct ieee80211_hdr *hdr; 4742 struct ieee80211_tx_data tx = { 4743 .local = sdata->local, 4744 .sdata = sdata, 4745 }; 4746 struct sta_info *sta; 4747 4748 rcu_read_lock(); 4749 4750 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4751 kfree_skb(skb); 4752 skb = ERR_PTR(-EINVAL); 4753 goto out; 4754 } 4755 4756 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4757 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4758 if (IS_ERR(skb)) 4759 goto out; 4760 4761 hdr = (void *)skb->data; 4762 tx.sta = sta_info_get(sdata, hdr->addr1); 4763 tx.skb = skb; 4764 4765 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4766 rcu_read_unlock(); 4767 kfree_skb(skb); 4768 return ERR_PTR(-EINVAL); 4769 } 4770 4771 out: 4772 rcu_read_unlock(); 4773 return skb; 4774 } 4775 4776 /* 4777 * ieee80211_clear_tx_pending may not be called in a context where 4778 * it is possible that it packets could come in again. 4779 */ 4780 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4781 { 4782 struct sk_buff *skb; 4783 int i; 4784 4785 for (i = 0; i < local->hw.queues; i++) { 4786 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4787 ieee80211_free_txskb(&local->hw, skb); 4788 } 4789 } 4790 4791 /* 4792 * Returns false if the frame couldn't be transmitted but was queued instead, 4793 * which in this case means re-queued -- take as an indication to stop sending 4794 * more pending frames. 4795 */ 4796 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4797 struct sk_buff *skb) 4798 { 4799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4800 struct ieee80211_sub_if_data *sdata; 4801 struct sta_info *sta; 4802 struct ieee80211_hdr *hdr; 4803 bool result; 4804 struct ieee80211_chanctx_conf *chanctx_conf; 4805 4806 sdata = vif_to_sdata(info->control.vif); 4807 4808 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4809 /* update band only for non-MLD */ 4810 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4811 chanctx_conf = 4812 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4813 if (unlikely(!chanctx_conf)) { 4814 dev_kfree_skb(skb); 4815 return true; 4816 } 4817 info->band = chanctx_conf->def.chan->band; 4818 } 4819 result = ieee80211_tx(sdata, NULL, skb, true); 4820 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4821 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4822 dev_kfree_skb(skb); 4823 return true; 4824 } 4825 4826 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4827 sta = NULL; 4828 4829 result = ieee80211_tx_8023(sdata, skb, sta, true); 4830 } else { 4831 struct sk_buff_head skbs; 4832 4833 __skb_queue_head_init(&skbs); 4834 __skb_queue_tail(&skbs, skb); 4835 4836 hdr = (struct ieee80211_hdr *)skb->data; 4837 sta = sta_info_get(sdata, hdr->addr1); 4838 4839 result = __ieee80211_tx(local, &skbs, sta, true); 4840 } 4841 4842 return result; 4843 } 4844 4845 /* 4846 * Transmit all pending packets. Called from tasklet. 4847 */ 4848 void ieee80211_tx_pending(struct tasklet_struct *t) 4849 { 4850 struct ieee80211_local *local = from_tasklet(local, t, 4851 tx_pending_tasklet); 4852 unsigned long flags; 4853 int i; 4854 bool txok; 4855 4856 rcu_read_lock(); 4857 4858 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4859 for (i = 0; i < local->hw.queues; i++) { 4860 /* 4861 * If queue is stopped by something other than due to pending 4862 * frames, or we have no pending frames, proceed to next queue. 4863 */ 4864 if (local->queue_stop_reasons[i] || 4865 skb_queue_empty(&local->pending[i])) 4866 continue; 4867 4868 while (!skb_queue_empty(&local->pending[i])) { 4869 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4870 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4871 4872 if (WARN_ON(!info->control.vif)) { 4873 ieee80211_free_txskb(&local->hw, skb); 4874 continue; 4875 } 4876 4877 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4878 flags); 4879 4880 txok = ieee80211_tx_pending_skb(local, skb); 4881 spin_lock_irqsave(&local->queue_stop_reason_lock, 4882 flags); 4883 if (!txok) 4884 break; 4885 } 4886 } 4887 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4888 4889 rcu_read_unlock(); 4890 } 4891 4892 /* functions for drivers to get certain frames */ 4893 4894 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 4895 struct sk_buff *skb, 4896 bool mcast_traffic) 4897 { 4898 int i, n1 = 0, n2; 4899 4900 /* 4901 * Find largest even number N1 so that bits numbered 1 through 4902 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4903 * (N2 + 1) x 8 through 2007 are 0. 4904 */ 4905 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4906 if (ps->tim[i]) { 4907 n1 = i & 0xfe; 4908 break; 4909 } 4910 } 4911 n2 = n1; 4912 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4913 if (ps->tim[i]) { 4914 n2 = i; 4915 break; 4916 } 4917 } 4918 4919 /* Bitmap control */ 4920 skb_put_u8(skb, n1 | mcast_traffic); 4921 /* Part Virt Bitmap */ 4922 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4923 } 4924 4925 /* 4926 * mac80211 currently supports encoding using block bitmap mode, non 4927 * inversed. The current implementation supports up to 1600 AIDs. 4928 * 4929 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 4930 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 4931 * describes 8 AIDs and the presence of a subblock is determined by 4932 * the block bitmap. 4933 */ 4934 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 4935 struct sk_buff *skb, 4936 bool mcast_traffic) 4937 { 4938 int blk; 4939 4940 /* 4941 * Emit a bitmap control block with a page slice number of 31 and a 4942 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 4943 * that the entire page (2048 bits) indicated by the page index 4944 * is encoded in the partial virtual bitmap. 4945 */ 4946 skb_put_u8(skb, mcast_traffic | (31 << 1)); 4947 4948 /* Emit an encoded block for each non-zero sub-block */ 4949 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 4950 u8 blk_bmap = 0; 4951 int sblk; 4952 4953 for (sblk = 0; sblk < 8; sblk++) { 4954 int sblk_idx = blk * 8 + sblk; 4955 4956 /* 4957 * If the current subblock is non-zero, increase the 4958 * number of subblocks to emit for the current block. 4959 */ 4960 if (ps->tim[sblk_idx]) 4961 blk_bmap |= BIT(sblk); 4962 } 4963 4964 /* If the current block contains no non-zero sublocks */ 4965 if (!blk_bmap) 4966 continue; 4967 4968 /* 4969 * Emit a block control byte for the current encoded block 4970 * with an encoding mode of block bitmap (0x0), not inverse 4971 * (0x0) and the current block offset (5 bits) 4972 */ 4973 skb_put_u8(skb, blk << 3); 4974 4975 /* 4976 * Emit the block bitmap for the current encoded block which 4977 * contains the present subblocks. 4978 */ 4979 skb_put_u8(skb, blk_bmap); 4980 4981 /* Emit the present subblocks */ 4982 for (sblk = 0; sblk < 8; sblk++) { 4983 int sblk_idx = blk * 8 + sblk; 4984 4985 if (!(blk_bmap & BIT(sblk))) 4986 continue; 4987 4988 skb_put_u8(skb, ps->tim[sblk_idx]); 4989 } 4990 } 4991 } 4992 4993 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4994 struct ieee80211_link_data *link, 4995 struct ps_data *ps, struct sk_buff *skb, 4996 bool is_template) 4997 { 4998 struct element *tim; 4999 bool mcast_traffic = false, have_bits = false; 5000 struct ieee80211_bss_conf *link_conf = link->conf; 5001 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5002 5003 /* Generate bitmap for TIM only if there are any STAs in power save 5004 * mode. */ 5005 if (atomic_read(&ps->num_sta_ps) > 0) 5006 /* in the hope that this is faster than 5007 * checking byte-for-byte */ 5008 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5009 IEEE80211_MAX_AID + 1); 5010 5011 if (!is_template) { 5012 if (ps->dtim_count == 0) 5013 ps->dtim_count = link_conf->dtim_period - 1; 5014 else 5015 ps->dtim_count--; 5016 } 5017 5018 /* Length is set after parsing the AID bitmap */ 5019 tim = skb_put(skb, sizeof(struct element)); 5020 tim->id = WLAN_EID_TIM; 5021 skb_put_u8(skb, ps->dtim_count); 5022 skb_put_u8(skb, link_conf->dtim_period); 5023 5024 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5025 mcast_traffic = true; 5026 5027 ps->dtim_bc_mc = mcast_traffic; 5028 5029 if (have_bits) { 5030 if (s1g) 5031 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, 5032 mcast_traffic); 5033 else 5034 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5035 } else { 5036 /* 5037 * If there is no buffered unicast traffic for an S1G 5038 * interface, we can exclude the bitmap control. This is in 5039 * contrast to other phy types as they do include the bitmap 5040 * control and pvb even when there is no buffered traffic. 5041 */ 5042 if (!s1g) { 5043 /* Bitmap control */ 5044 skb_put_u8(skb, mcast_traffic); 5045 /* Part Virt Bitmap */ 5046 skb_put_u8(skb, 0); 5047 } 5048 } 5049 5050 tim->datalen = skb_tail_pointer(skb) - tim->data; 5051 } 5052 5053 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5054 struct ieee80211_link_data *link, 5055 struct ps_data *ps, struct sk_buff *skb, 5056 bool is_template) 5057 { 5058 struct ieee80211_local *local = sdata->local; 5059 5060 /* 5061 * Not very nice, but we want to allow the driver to call 5062 * ieee80211_beacon_get() as a response to the set_tim() 5063 * callback. That, however, is already invoked under the 5064 * sta_lock to guarantee consistent and race-free update 5065 * of the tim bitmap in mac80211 and the driver. 5066 */ 5067 if (local->tim_in_locked_section) { 5068 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5069 } else { 5070 spin_lock_bh(&local->tim_lock); 5071 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5072 spin_unlock_bh(&local->tim_lock); 5073 } 5074 5075 return 0; 5076 } 5077 5078 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5079 struct beacon_data *beacon, 5080 struct ieee80211_link_data *link) 5081 { 5082 u8 *beacon_data, count, max_count = 1; 5083 struct probe_resp *resp; 5084 size_t beacon_data_len; 5085 u16 *bcn_offsets; 5086 int i; 5087 5088 switch (sdata->vif.type) { 5089 case NL80211_IFTYPE_AP: 5090 beacon_data = beacon->tail; 5091 beacon_data_len = beacon->tail_len; 5092 break; 5093 case NL80211_IFTYPE_ADHOC: 5094 beacon_data = beacon->head; 5095 beacon_data_len = beacon->head_len; 5096 break; 5097 case NL80211_IFTYPE_MESH_POINT: 5098 beacon_data = beacon->head; 5099 beacon_data_len = beacon->head_len; 5100 break; 5101 default: 5102 return; 5103 } 5104 5105 resp = rcu_dereference(link->u.ap.probe_resp); 5106 5107 bcn_offsets = beacon->cntdwn_counter_offsets; 5108 count = beacon->cntdwn_current_counter; 5109 if (link->conf->csa_active) 5110 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5111 5112 for (i = 0; i < max_count; ++i) { 5113 if (bcn_offsets[i]) { 5114 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5115 return; 5116 beacon_data[bcn_offsets[i]] = count; 5117 } 5118 5119 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5120 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5121 5122 resp->data[resp_offsets[i]] = count; 5123 } 5124 } 5125 } 5126 5127 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5128 struct beacon_data *beacon) 5129 { 5130 if (beacon->cntdwn_current_counter == 1) { 5131 /* 5132 * Channel switch handling is done by a worker thread while 5133 * beacons get pulled from hardware timers. It's therefore 5134 * possible that software threads are slow enough to not be 5135 * able to complete CSA handling in a single beacon interval, 5136 * in which case we get here. There isn't much to do about 5137 * it, other than letting the user know that the AP isn't 5138 * behaving correctly. 5139 */ 5140 link_err_once(link, 5141 "beacon TX faster than countdown (channel/color switch) completion\n"); 5142 return 0; 5143 } 5144 5145 beacon->cntdwn_current_counter--; 5146 5147 return beacon->cntdwn_current_counter; 5148 } 5149 5150 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5151 { 5152 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5153 struct ieee80211_link_data *link; 5154 struct beacon_data *beacon = NULL; 5155 u8 count = 0; 5156 5157 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5158 return 0; 5159 5160 rcu_read_lock(); 5161 5162 link = rcu_dereference(sdata->link[link_id]); 5163 if (!link) 5164 goto unlock; 5165 5166 if (sdata->vif.type == NL80211_IFTYPE_AP) 5167 beacon = rcu_dereference(link->u.ap.beacon); 5168 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5169 beacon = rcu_dereference(sdata->u.ibss.presp); 5170 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5171 beacon = rcu_dereference(sdata->u.mesh.beacon); 5172 5173 if (!beacon) 5174 goto unlock; 5175 5176 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5177 5178 unlock: 5179 rcu_read_unlock(); 5180 return count; 5181 } 5182 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5183 5184 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5185 { 5186 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5187 struct beacon_data *beacon = NULL; 5188 5189 rcu_read_lock(); 5190 5191 if (sdata->vif.type == NL80211_IFTYPE_AP) 5192 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5193 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5194 beacon = rcu_dereference(sdata->u.ibss.presp); 5195 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5196 beacon = rcu_dereference(sdata->u.mesh.beacon); 5197 5198 if (!beacon) 5199 goto unlock; 5200 5201 if (counter < beacon->cntdwn_current_counter) 5202 beacon->cntdwn_current_counter = counter; 5203 5204 unlock: 5205 rcu_read_unlock(); 5206 } 5207 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5208 5209 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5210 unsigned int link_id) 5211 { 5212 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5213 struct ieee80211_link_data *link; 5214 struct beacon_data *beacon = NULL; 5215 u8 *beacon_data; 5216 size_t beacon_data_len; 5217 int ret = false; 5218 5219 if (!ieee80211_sdata_running(sdata)) 5220 return false; 5221 5222 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5223 return 0; 5224 5225 rcu_read_lock(); 5226 5227 link = rcu_dereference(sdata->link[link_id]); 5228 if (!link) 5229 goto out; 5230 5231 if (vif->type == NL80211_IFTYPE_AP) { 5232 beacon = rcu_dereference(link->u.ap.beacon); 5233 if (WARN_ON(!beacon || !beacon->tail)) 5234 goto out; 5235 beacon_data = beacon->tail; 5236 beacon_data_len = beacon->tail_len; 5237 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5238 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5239 5240 beacon = rcu_dereference(ifibss->presp); 5241 if (!beacon) 5242 goto out; 5243 5244 beacon_data = beacon->head; 5245 beacon_data_len = beacon->head_len; 5246 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5247 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5248 5249 beacon = rcu_dereference(ifmsh->beacon); 5250 if (!beacon) 5251 goto out; 5252 5253 beacon_data = beacon->head; 5254 beacon_data_len = beacon->head_len; 5255 } else { 5256 WARN_ON(1); 5257 goto out; 5258 } 5259 5260 if (!beacon->cntdwn_counter_offsets[0]) 5261 goto out; 5262 5263 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5264 goto out; 5265 5266 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5267 ret = true; 5268 5269 out: 5270 rcu_read_unlock(); 5271 5272 return ret; 5273 } 5274 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5275 5276 static int ieee80211_beacon_protect(struct sk_buff *skb, 5277 struct ieee80211_local *local, 5278 struct ieee80211_sub_if_data *sdata, 5279 struct ieee80211_link_data *link) 5280 { 5281 ieee80211_tx_result res; 5282 struct ieee80211_tx_data tx; 5283 struct sk_buff *check_skb; 5284 5285 memset(&tx, 0, sizeof(tx)); 5286 tx.key = rcu_dereference(link->default_beacon_key); 5287 if (!tx.key) 5288 return 0; 5289 5290 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5291 tx.key = NULL; 5292 return -EINVAL; 5293 } 5294 5295 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5296 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5297 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5298 5299 tx.local = local; 5300 tx.sdata = sdata; 5301 __skb_queue_head_init(&tx.skbs); 5302 __skb_queue_tail(&tx.skbs, skb); 5303 res = ieee80211_tx_h_encrypt(&tx); 5304 check_skb = __skb_dequeue(&tx.skbs); 5305 /* we may crash after this, but it'd be a bug in crypto */ 5306 WARN_ON(check_skb != skb); 5307 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5308 return -EINVAL; 5309 5310 return 0; 5311 } 5312 5313 static void 5314 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5315 struct ieee80211_vif *vif, 5316 struct ieee80211_link_data *link, 5317 struct ieee80211_mutable_offsets *offs, 5318 struct beacon_data *beacon, 5319 struct sk_buff *skb, 5320 struct ieee80211_chanctx_conf *chanctx_conf, 5321 u16 csa_off_base) 5322 { 5323 struct ieee80211_local *local = hw_to_local(hw); 5324 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5325 struct ieee80211_tx_info *info; 5326 enum nl80211_band band; 5327 struct ieee80211_tx_rate_control txrc; 5328 5329 /* CSA offsets */ 5330 if (offs && beacon) { 5331 u16 i; 5332 5333 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5334 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5335 5336 if (!csa_off) 5337 continue; 5338 5339 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5340 } 5341 } 5342 5343 band = chanctx_conf->def.chan->band; 5344 info = IEEE80211_SKB_CB(skb); 5345 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5346 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5347 info->band = band; 5348 5349 memset(&txrc, 0, sizeof(txrc)); 5350 txrc.hw = hw; 5351 txrc.sband = local->hw.wiphy->bands[band]; 5352 txrc.bss_conf = link->conf; 5353 txrc.skb = skb; 5354 txrc.reported_rate.idx = -1; 5355 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5356 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5357 else 5358 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5359 txrc.bss = true; 5360 rate_control_get_rate(sdata, NULL, &txrc); 5361 5362 info->control.vif = vif; 5363 info->control.flags |= u32_encode_bits(link->link_id, 5364 IEEE80211_TX_CTRL_MLO_LINK); 5365 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5366 IEEE80211_TX_CTL_ASSIGN_SEQ | 5367 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5368 } 5369 5370 static void 5371 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5372 u8 i) 5373 { 5374 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5375 i > beacon->mbssid_ies->cnt) 5376 return; 5377 5378 if (i < beacon->mbssid_ies->cnt) { 5379 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5380 beacon->mbssid_ies->elem[i].len); 5381 5382 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5383 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5384 beacon->rnr_ies->elem[i].len); 5385 5386 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5387 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5388 beacon->rnr_ies->elem[i].len); 5389 } 5390 return; 5391 } 5392 5393 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5394 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5395 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5396 beacon->mbssid_ies->elem[i].len); 5397 } 5398 5399 static struct sk_buff * 5400 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5401 struct ieee80211_vif *vif, 5402 struct ieee80211_link_data *link, 5403 struct ieee80211_mutable_offsets *offs, 5404 bool is_template, 5405 struct beacon_data *beacon, 5406 struct ieee80211_chanctx_conf *chanctx_conf, 5407 u8 ema_index) 5408 { 5409 struct ieee80211_local *local = hw_to_local(hw); 5410 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5411 struct ieee80211_if_ap *ap = &sdata->u.ap; 5412 struct sk_buff *skb = NULL; 5413 u16 csa_off_base = 0; 5414 int mbssid_len; 5415 5416 if (beacon->cntdwn_counter_offsets[0]) { 5417 if (!is_template) 5418 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5419 5420 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5421 } 5422 5423 /* headroom, head length, 5424 * tail length, maximum TIM length and multiple BSSID length 5425 */ 5426 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5427 beacon->rnr_ies, 5428 ema_index); 5429 5430 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5431 beacon->tail_len + 256 + 5432 local->hw.extra_beacon_tailroom + mbssid_len); 5433 if (!skb) 5434 return NULL; 5435 5436 skb_reserve(skb, local->tx_headroom); 5437 skb_put_data(skb, beacon->head, beacon->head_len); 5438 5439 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5440 5441 if (offs) { 5442 offs->tim_offset = beacon->head_len; 5443 offs->tim_length = skb->len - beacon->head_len; 5444 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5445 5446 if (mbssid_len) { 5447 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5448 offs->mbssid_off = skb->len - mbssid_len; 5449 } 5450 5451 /* for AP the csa offsets are from tail */ 5452 csa_off_base = skb->len; 5453 } 5454 5455 if (beacon->tail) 5456 skb_put_data(skb, beacon->tail, beacon->tail_len); 5457 5458 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5459 dev_kfree_skb(skb); 5460 return NULL; 5461 } 5462 5463 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5464 chanctx_conf, csa_off_base); 5465 return skb; 5466 } 5467 5468 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5469 struct ieee80211_link_data *link) 5470 { 5471 struct ps_data *ps = &sdata->u.ap.ps; 5472 5473 if (ps->sb_count == 0) 5474 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5475 else 5476 ps->sb_count--; 5477 5478 return ps->sb_count == 0; 5479 } 5480 5481 static struct sk_buff * 5482 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5483 struct ieee80211_vif *vif, 5484 struct ieee80211_link_data *link, 5485 struct ieee80211_chanctx_conf *chanctx_conf, 5486 struct s1g_short_beacon_data *sb, 5487 bool is_template) 5488 { 5489 struct ieee80211_local *local = hw_to_local(hw); 5490 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5491 struct ieee80211_if_ap *ap = &sdata->u.ap; 5492 struct sk_buff *skb; 5493 5494 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5495 sb->short_tail_len + 256 + 5496 local->hw.extra_beacon_tailroom); 5497 if (!skb) 5498 return NULL; 5499 5500 skb_reserve(skb, local->tx_headroom); 5501 skb_put_data(skb, sb->short_head, sb->short_head_len); 5502 5503 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5504 5505 if (sb->short_tail) 5506 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5507 5508 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5509 chanctx_conf, 0); 5510 return skb; 5511 } 5512 5513 static struct sk_buff * 5514 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5515 struct ieee80211_link_data *link, 5516 struct ieee80211_mutable_offsets *offs, 5517 bool is_template, struct beacon_data *beacon, 5518 struct ieee80211_chanctx_conf *chanctx_conf, 5519 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5520 { 5521 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5522 5523 if (!sdata->vif.cfg.s1g || !s1g_sb || 5524 ieee80211_s1g_need_long_beacon(sdata, link)) 5525 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5526 is_template, beacon, 5527 chanctx_conf, ema_index); 5528 5529 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5530 s1g_sb, is_template); 5531 } 5532 5533 static struct ieee80211_ema_beacons * 5534 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5535 struct ieee80211_vif *vif, 5536 struct ieee80211_link_data *link, 5537 struct ieee80211_mutable_offsets *offs, 5538 bool is_template, struct beacon_data *beacon, 5539 struct ieee80211_chanctx_conf *chanctx_conf) 5540 { 5541 struct ieee80211_ema_beacons *ema = NULL; 5542 5543 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5544 return NULL; 5545 5546 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5547 GFP_ATOMIC); 5548 if (!ema) 5549 return NULL; 5550 5551 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5552 ema->bcn[ema->cnt].skb = 5553 ieee80211_beacon_get_ap(hw, vif, link, 5554 &ema->bcn[ema->cnt].offs, 5555 is_template, beacon, 5556 chanctx_conf, ema->cnt, NULL); 5557 if (!ema->bcn[ema->cnt].skb) 5558 break; 5559 } 5560 5561 if (ema->cnt == beacon->mbssid_ies->cnt) 5562 return ema; 5563 5564 ieee80211_beacon_free_ema_list(ema); 5565 return NULL; 5566 } 5567 5568 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5569 5570 static struct sk_buff * 5571 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5572 struct ieee80211_vif *vif, 5573 struct ieee80211_mutable_offsets *offs, 5574 bool is_template, 5575 unsigned int link_id, 5576 int ema_index, 5577 struct ieee80211_ema_beacons **ema_beacons) 5578 { 5579 struct ieee80211_local *local = hw_to_local(hw); 5580 struct beacon_data *beacon = NULL; 5581 struct sk_buff *skb = NULL; 5582 struct ieee80211_sub_if_data *sdata = NULL; 5583 struct ieee80211_chanctx_conf *chanctx_conf; 5584 struct ieee80211_link_data *link; 5585 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5586 5587 rcu_read_lock(); 5588 5589 sdata = vif_to_sdata(vif); 5590 link = rcu_dereference(sdata->link[link_id]); 5591 if (!link) 5592 goto out; 5593 chanctx_conf = 5594 rcu_dereference(link->conf->chanctx_conf); 5595 5596 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5597 goto out; 5598 5599 if (offs) 5600 memset(offs, 0, sizeof(*offs)); 5601 5602 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5603 beacon = rcu_dereference(link->u.ap.beacon); 5604 if (!beacon) 5605 goto out; 5606 5607 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5608 s1g_short_bcn = 5609 rcu_dereference(link->u.ap.s1g_short_beacon); 5610 if (!s1g_short_bcn) 5611 goto out; 5612 } 5613 5614 if (ema_beacons) { 5615 *ema_beacons = 5616 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5617 offs, 5618 is_template, 5619 beacon, 5620 chanctx_conf); 5621 } else { 5622 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5623 if (ema_index >= beacon->mbssid_ies->cnt) 5624 goto out; /* End of MBSSID elements */ 5625 5626 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5627 ema_index = beacon->mbssid_ies->cnt; 5628 } else { 5629 ema_index = 0; 5630 } 5631 5632 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5633 is_template, beacon, 5634 chanctx_conf, ema_index, 5635 s1g_short_bcn); 5636 } 5637 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5638 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5639 struct ieee80211_hdr *hdr; 5640 5641 beacon = rcu_dereference(ifibss->presp); 5642 if (!beacon) 5643 goto out; 5644 5645 if (beacon->cntdwn_counter_offsets[0]) { 5646 if (!is_template) 5647 __ieee80211_beacon_update_cntdwn(link, beacon); 5648 5649 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5650 } 5651 5652 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5653 local->hw.extra_beacon_tailroom); 5654 if (!skb) 5655 goto out; 5656 skb_reserve(skb, local->tx_headroom); 5657 skb_put_data(skb, beacon->head, beacon->head_len); 5658 5659 hdr = (struct ieee80211_hdr *) skb->data; 5660 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5661 IEEE80211_STYPE_BEACON); 5662 5663 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5664 chanctx_conf, 0); 5665 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5666 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5667 5668 beacon = rcu_dereference(ifmsh->beacon); 5669 if (!beacon) 5670 goto out; 5671 5672 if (beacon->cntdwn_counter_offsets[0]) { 5673 if (!is_template) 5674 /* TODO: For mesh csa_counter is in TU, so 5675 * decrementing it by one isn't correct, but 5676 * for now we leave it consistent with overall 5677 * mac80211's behavior. 5678 */ 5679 __ieee80211_beacon_update_cntdwn(link, beacon); 5680 5681 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5682 } 5683 5684 if (ifmsh->sync_ops) 5685 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5686 5687 skb = dev_alloc_skb(local->tx_headroom + 5688 beacon->head_len + 5689 256 + /* TIM IE */ 5690 beacon->tail_len + 5691 local->hw.extra_beacon_tailroom); 5692 if (!skb) 5693 goto out; 5694 skb_reserve(skb, local->tx_headroom); 5695 skb_put_data(skb, beacon->head, beacon->head_len); 5696 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5697 is_template); 5698 5699 if (offs) { 5700 offs->tim_offset = beacon->head_len; 5701 offs->tim_length = skb->len - beacon->head_len; 5702 } 5703 5704 skb_put_data(skb, beacon->tail, beacon->tail_len); 5705 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5706 chanctx_conf, 0); 5707 } else { 5708 WARN_ON(1); 5709 goto out; 5710 } 5711 5712 out: 5713 rcu_read_unlock(); 5714 return skb; 5715 5716 } 5717 5718 struct sk_buff * 5719 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5720 struct ieee80211_vif *vif, 5721 struct ieee80211_mutable_offsets *offs, 5722 unsigned int link_id) 5723 { 5724 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5725 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5726 } 5727 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5728 5729 struct sk_buff * 5730 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5731 struct ieee80211_vif *vif, 5732 struct ieee80211_mutable_offsets *offs, 5733 unsigned int link_id, u8 ema_index) 5734 { 5735 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5736 NULL); 5737 } 5738 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5739 5740 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5741 { 5742 u8 i; 5743 5744 if (!ema_beacons) 5745 return; 5746 5747 for (i = 0; i < ema_beacons->cnt; i++) 5748 kfree_skb(ema_beacons->bcn[i].skb); 5749 5750 kfree(ema_beacons); 5751 } 5752 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5753 5754 struct ieee80211_ema_beacons * 5755 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5756 struct ieee80211_vif *vif, 5757 unsigned int link_id) 5758 { 5759 struct ieee80211_ema_beacons *ema_beacons = NULL; 5760 5761 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5762 &ema_beacons)); 5763 5764 return ema_beacons; 5765 } 5766 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5767 5768 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5769 struct ieee80211_vif *vif, 5770 u16 *tim_offset, u16 *tim_length, 5771 unsigned int link_id) 5772 { 5773 struct ieee80211_mutable_offsets offs = {}; 5774 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5775 link_id, 5776 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5777 NULL); 5778 struct sk_buff *copy; 5779 5780 if (!bcn) 5781 return bcn; 5782 5783 if (tim_offset) 5784 *tim_offset = offs.tim_offset; 5785 5786 if (tim_length) 5787 *tim_length = offs.tim_length; 5788 5789 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5790 !hw_to_local(hw)->monitors) 5791 return bcn; 5792 5793 /* send a copy to monitor interfaces */ 5794 copy = skb_copy(bcn, GFP_ATOMIC); 5795 if (!copy) 5796 return bcn; 5797 5798 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 5799 5800 return bcn; 5801 } 5802 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5803 5804 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5805 struct ieee80211_vif *vif) 5806 { 5807 struct sk_buff *skb = NULL; 5808 struct probe_resp *presp = NULL; 5809 struct ieee80211_hdr *hdr; 5810 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5811 5812 if (sdata->vif.type != NL80211_IFTYPE_AP) 5813 return NULL; 5814 5815 rcu_read_lock(); 5816 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5817 if (!presp) 5818 goto out; 5819 5820 skb = dev_alloc_skb(presp->len); 5821 if (!skb) 5822 goto out; 5823 5824 skb_put_data(skb, presp->data, presp->len); 5825 5826 hdr = (struct ieee80211_hdr *) skb->data; 5827 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5828 5829 out: 5830 rcu_read_unlock(); 5831 return skb; 5832 } 5833 EXPORT_SYMBOL(ieee80211_proberesp_get); 5834 5835 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5836 struct ieee80211_vif *vif) 5837 { 5838 struct sk_buff *skb = NULL; 5839 struct fils_discovery_data *tmpl = NULL; 5840 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5841 5842 if (sdata->vif.type != NL80211_IFTYPE_AP) 5843 return NULL; 5844 5845 rcu_read_lock(); 5846 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5847 if (!tmpl) { 5848 rcu_read_unlock(); 5849 return NULL; 5850 } 5851 5852 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5853 if (skb) { 5854 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5855 skb_put_data(skb, tmpl->data, tmpl->len); 5856 } 5857 5858 rcu_read_unlock(); 5859 return skb; 5860 } 5861 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5862 5863 struct sk_buff * 5864 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5865 struct ieee80211_vif *vif) 5866 { 5867 struct sk_buff *skb = NULL; 5868 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5869 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5870 5871 if (sdata->vif.type != NL80211_IFTYPE_AP) 5872 return NULL; 5873 5874 rcu_read_lock(); 5875 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5876 if (!tmpl) { 5877 rcu_read_unlock(); 5878 return NULL; 5879 } 5880 5881 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5882 if (skb) { 5883 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5884 skb_put_data(skb, tmpl->data, tmpl->len); 5885 } 5886 5887 rcu_read_unlock(); 5888 return skb; 5889 } 5890 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5891 5892 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5893 struct ieee80211_vif *vif) 5894 { 5895 struct ieee80211_sub_if_data *sdata; 5896 struct ieee80211_pspoll *pspoll; 5897 struct ieee80211_local *local; 5898 struct sk_buff *skb; 5899 5900 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5901 return NULL; 5902 5903 sdata = vif_to_sdata(vif); 5904 local = sdata->local; 5905 5906 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5907 if (!skb) 5908 return NULL; 5909 5910 skb_reserve(skb, local->hw.extra_tx_headroom); 5911 5912 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5913 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5914 IEEE80211_STYPE_PSPOLL); 5915 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5916 5917 /* aid in PS-Poll has its two MSBs each set to 1 */ 5918 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5919 5920 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5921 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5922 5923 return skb; 5924 } 5925 EXPORT_SYMBOL(ieee80211_pspoll_get); 5926 5927 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5928 struct ieee80211_vif *vif, 5929 int link_id, bool qos_ok) 5930 { 5931 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5932 struct ieee80211_local *local = sdata->local; 5933 struct ieee80211_link_data *link = NULL; 5934 struct ieee80211_hdr_3addr *nullfunc; 5935 struct sk_buff *skb; 5936 bool qos = false; 5937 5938 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5939 return NULL; 5940 5941 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5942 sizeof(*nullfunc) + 2); 5943 if (!skb) 5944 return NULL; 5945 5946 rcu_read_lock(); 5947 if (qos_ok) { 5948 struct sta_info *sta; 5949 5950 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5951 qos = sta && sta->sta.wme; 5952 } 5953 5954 if (link_id >= 0) { 5955 link = rcu_dereference(sdata->link[link_id]); 5956 if (WARN_ON_ONCE(!link)) { 5957 rcu_read_unlock(); 5958 kfree_skb(skb); 5959 return NULL; 5960 } 5961 } 5962 5963 skb_reserve(skb, local->hw.extra_tx_headroom); 5964 5965 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5966 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5967 IEEE80211_STYPE_NULLFUNC | 5968 IEEE80211_FCTL_TODS); 5969 if (qos) { 5970 __le16 qoshdr = cpu_to_le16(7); 5971 5972 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5973 IEEE80211_STYPE_NULLFUNC) != 5974 IEEE80211_STYPE_QOS_NULLFUNC); 5975 nullfunc->frame_control |= 5976 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5977 skb->priority = 7; 5978 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5979 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5980 } 5981 5982 if (link) { 5983 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5984 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5985 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5986 } else { 5987 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5988 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5989 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5990 } 5991 rcu_read_unlock(); 5992 5993 return skb; 5994 } 5995 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5996 5997 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5998 const u8 *src_addr, 5999 const u8 *ssid, size_t ssid_len, 6000 size_t tailroom) 6001 { 6002 struct ieee80211_local *local = hw_to_local(hw); 6003 struct ieee80211_hdr_3addr *hdr; 6004 struct sk_buff *skb; 6005 size_t ie_ssid_len; 6006 u8 *pos; 6007 6008 ie_ssid_len = 2 + ssid_len; 6009 6010 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6011 ie_ssid_len + tailroom); 6012 if (!skb) 6013 return NULL; 6014 6015 skb_reserve(skb, local->hw.extra_tx_headroom); 6016 6017 hdr = skb_put_zero(skb, sizeof(*hdr)); 6018 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6019 IEEE80211_STYPE_PROBE_REQ); 6020 eth_broadcast_addr(hdr->addr1); 6021 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6022 eth_broadcast_addr(hdr->addr3); 6023 6024 pos = skb_put(skb, ie_ssid_len); 6025 *pos++ = WLAN_EID_SSID; 6026 *pos++ = ssid_len; 6027 if (ssid_len) 6028 memcpy(pos, ssid, ssid_len); 6029 pos += ssid_len; 6030 6031 return skb; 6032 } 6033 EXPORT_SYMBOL(ieee80211_probereq_get); 6034 6035 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6036 const void *frame, size_t frame_len, 6037 const struct ieee80211_tx_info *frame_txctl, 6038 struct ieee80211_rts *rts) 6039 { 6040 const struct ieee80211_hdr *hdr = frame; 6041 6042 rts->frame_control = 6043 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6044 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6045 frame_txctl); 6046 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6047 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6048 } 6049 EXPORT_SYMBOL(ieee80211_rts_get); 6050 6051 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6052 const void *frame, size_t frame_len, 6053 const struct ieee80211_tx_info *frame_txctl, 6054 struct ieee80211_cts *cts) 6055 { 6056 const struct ieee80211_hdr *hdr = frame; 6057 6058 cts->frame_control = 6059 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6060 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6061 frame_len, frame_txctl); 6062 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6063 } 6064 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6065 6066 struct sk_buff * 6067 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6068 struct ieee80211_vif *vif) 6069 { 6070 struct ieee80211_local *local = hw_to_local(hw); 6071 struct sk_buff *skb = NULL; 6072 struct ieee80211_tx_data tx; 6073 struct ieee80211_sub_if_data *sdata; 6074 struct ps_data *ps; 6075 struct ieee80211_tx_info *info; 6076 struct ieee80211_chanctx_conf *chanctx_conf; 6077 6078 sdata = vif_to_sdata(vif); 6079 6080 rcu_read_lock(); 6081 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6082 6083 if (!chanctx_conf) 6084 goto out; 6085 6086 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6087 struct beacon_data *beacon = 6088 rcu_dereference(sdata->deflink.u.ap.beacon); 6089 6090 if (!beacon || !beacon->head) 6091 goto out; 6092 6093 ps = &sdata->u.ap.ps; 6094 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6095 ps = &sdata->u.mesh.ps; 6096 } else { 6097 goto out; 6098 } 6099 6100 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6101 goto out; /* send buffered bc/mc only after DTIM beacon */ 6102 6103 while (1) { 6104 skb = skb_dequeue(&ps->bc_buf); 6105 if (!skb) 6106 goto out; 6107 local->total_ps_buffered--; 6108 6109 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6110 struct ieee80211_hdr *hdr = 6111 (struct ieee80211_hdr *) skb->data; 6112 /* more buffered multicast/broadcast frames ==> set 6113 * MoreData flag in IEEE 802.11 header to inform PS 6114 * STAs */ 6115 hdr->frame_control |= 6116 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6117 } 6118 6119 if (sdata->vif.type == NL80211_IFTYPE_AP) 6120 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6121 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6122 break; 6123 ieee80211_free_txskb(hw, skb); 6124 } 6125 6126 info = IEEE80211_SKB_CB(skb); 6127 6128 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6129 info->band = chanctx_conf->def.chan->band; 6130 6131 if (invoke_tx_handlers(&tx)) 6132 skb = NULL; 6133 out: 6134 rcu_read_unlock(); 6135 6136 return skb; 6137 } 6138 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6139 6140 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6141 { 6142 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6143 struct ieee80211_sub_if_data *sdata = sta->sdata; 6144 struct ieee80211_local *local = sdata->local; 6145 int ret; 6146 u32 queues; 6147 6148 lockdep_assert_wiphy(local->hw.wiphy); 6149 6150 /* only some cases are supported right now */ 6151 switch (sdata->vif.type) { 6152 case NL80211_IFTYPE_STATION: 6153 case NL80211_IFTYPE_AP: 6154 case NL80211_IFTYPE_AP_VLAN: 6155 break; 6156 default: 6157 WARN_ON(1); 6158 return -EINVAL; 6159 } 6160 6161 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6162 return -EINVAL; 6163 6164 if (sta->reserved_tid == tid) { 6165 ret = 0; 6166 goto out; 6167 } 6168 6169 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6170 sdata_err(sdata, "TID reservation already active\n"); 6171 ret = -EALREADY; 6172 goto out; 6173 } 6174 6175 ieee80211_stop_vif_queues(sdata->local, sdata, 6176 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6177 6178 synchronize_net(); 6179 6180 /* Tear down BA sessions so we stop aggregating on this TID */ 6181 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6182 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6183 __ieee80211_stop_tx_ba_session(sta, tid, 6184 AGG_STOP_LOCAL_REQUEST); 6185 } 6186 6187 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6188 __ieee80211_flush_queues(local, sdata, queues, false); 6189 6190 sta->reserved_tid = tid; 6191 6192 ieee80211_wake_vif_queues(local, sdata, 6193 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6194 6195 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6196 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6197 6198 ret = 0; 6199 out: 6200 return ret; 6201 } 6202 EXPORT_SYMBOL(ieee80211_reserve_tid); 6203 6204 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6205 { 6206 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6207 struct ieee80211_sub_if_data *sdata = sta->sdata; 6208 6209 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6210 6211 /* only some cases are supported right now */ 6212 switch (sdata->vif.type) { 6213 case NL80211_IFTYPE_STATION: 6214 case NL80211_IFTYPE_AP: 6215 case NL80211_IFTYPE_AP_VLAN: 6216 break; 6217 default: 6218 WARN_ON(1); 6219 return; 6220 } 6221 6222 if (tid != sta->reserved_tid) { 6223 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6224 return; 6225 } 6226 6227 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6228 } 6229 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6230 6231 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6232 struct sk_buff *skb, int tid, int link_id, 6233 enum nl80211_band band) 6234 { 6235 const struct ieee80211_hdr *hdr = (void *)skb->data; 6236 int ac = ieee80211_ac_from_tid(tid); 6237 unsigned int link; 6238 6239 skb_reset_mac_header(skb); 6240 skb_set_queue_mapping(skb, ac); 6241 skb->priority = tid; 6242 6243 skb->dev = sdata->dev; 6244 6245 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6246 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6247 IEEE80211_LINK_UNSPECIFIED)); 6248 6249 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6250 link = 0; 6251 } else if (link_id >= 0) { 6252 link = link_id; 6253 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6254 /* address from the MLD */ 6255 link = IEEE80211_LINK_UNSPECIFIED; 6256 } else { 6257 /* otherwise must be addressed from a link */ 6258 rcu_read_lock(); 6259 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6260 struct ieee80211_bss_conf *link_conf; 6261 6262 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6263 if (!link_conf) 6264 continue; 6265 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6266 break; 6267 } 6268 rcu_read_unlock(); 6269 6270 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6271 link = ffs(sdata->vif.active_links) - 1; 6272 } 6273 6274 IEEE80211_SKB_CB(skb)->control.flags |= 6275 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6276 6277 /* 6278 * The other path calling ieee80211_xmit is from the tasklet, 6279 * and while we can handle concurrent transmissions locking 6280 * requirements are that we do not come into tx with bhs on. 6281 */ 6282 local_bh_disable(); 6283 IEEE80211_SKB_CB(skb)->band = band; 6284 ieee80211_xmit(sdata, NULL, skb); 6285 local_bh_enable(); 6286 } 6287 6288 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6289 struct sk_buff *skb, int tid, int link_id) 6290 { 6291 struct ieee80211_chanctx_conf *chanctx_conf; 6292 enum nl80211_band band; 6293 6294 rcu_read_lock(); 6295 if (sdata->vif.type == NL80211_IFTYPE_NAN) { 6296 band = NUM_NL80211_BANDS; 6297 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6298 WARN_ON(link_id >= 0); 6299 chanctx_conf = 6300 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6301 if (WARN_ON(!chanctx_conf)) { 6302 rcu_read_unlock(); 6303 kfree_skb(skb); 6304 return; 6305 } 6306 band = chanctx_conf->def.chan->band; 6307 } else { 6308 WARN_ON(link_id >= 0 && 6309 !(sdata->vif.active_links & BIT(link_id))); 6310 /* MLD transmissions must not rely on the band */ 6311 band = 0; 6312 } 6313 6314 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6315 rcu_read_unlock(); 6316 } 6317 6318 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6319 const u8 *buf, size_t len, 6320 const u8 *dest, __be16 proto, bool unencrypted, 6321 int link_id, u64 *cookie) 6322 { 6323 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6324 struct ieee80211_local *local = sdata->local; 6325 struct sta_info *sta; 6326 struct sk_buff *skb; 6327 struct ethhdr *ehdr; 6328 u32 ctrl_flags = 0; 6329 u32 flags = 0; 6330 int err; 6331 6332 /* mutex lock is only needed for incrementing the cookie counter */ 6333 lockdep_assert_wiphy(local->hw.wiphy); 6334 6335 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6336 * or Pre-Authentication 6337 */ 6338 if (proto != sdata->control_port_protocol && 6339 proto != cpu_to_be16(ETH_P_PREAUTH)) 6340 return -EINVAL; 6341 6342 if (proto == sdata->control_port_protocol) 6343 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6344 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6345 6346 if (unencrypted) 6347 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6348 6349 if (cookie) 6350 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6351 6352 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6353 6354 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6355 sizeof(struct ethhdr) + len); 6356 if (!skb) 6357 return -ENOMEM; 6358 6359 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6360 6361 skb_put_data(skb, buf, len); 6362 6363 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6364 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6365 6366 /* we may override the SA for MLO STA later */ 6367 if (link_id < 0) { 6368 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6369 IEEE80211_TX_CTRL_MLO_LINK); 6370 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6371 } else { 6372 struct ieee80211_bss_conf *link_conf; 6373 6374 ctrl_flags |= u32_encode_bits(link_id, 6375 IEEE80211_TX_CTRL_MLO_LINK); 6376 6377 rcu_read_lock(); 6378 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6379 if (!link_conf) { 6380 dev_kfree_skb(skb); 6381 rcu_read_unlock(); 6382 return -ENOLINK; 6383 } 6384 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6385 rcu_read_unlock(); 6386 } 6387 6388 ehdr->h_proto = proto; 6389 6390 skb->dev = dev; 6391 skb->protocol = proto; 6392 skb_reset_network_header(skb); 6393 skb_reset_mac_header(skb); 6394 6395 if (local->hw.queues < IEEE80211_NUM_ACS) 6396 goto start_xmit; 6397 6398 /* update QoS header to prioritize control port frames if possible, 6399 * prioritization also happens for control port frames send over 6400 * AF_PACKET 6401 */ 6402 rcu_read_lock(); 6403 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6404 if (err) { 6405 dev_kfree_skb(skb); 6406 rcu_read_unlock(); 6407 return err; 6408 } 6409 6410 if (!IS_ERR(sta)) { 6411 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6412 6413 skb_set_queue_mapping(skb, queue); 6414 6415 /* 6416 * for MLO STA, the SA should be the AP MLD address, but 6417 * the link ID has been selected already 6418 */ 6419 if (sta && sta->sta.mlo) 6420 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6421 } 6422 rcu_read_unlock(); 6423 6424 start_xmit: 6425 local_bh_disable(); 6426 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6427 local_bh_enable(); 6428 6429 return 0; 6430 } 6431 6432 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6433 const u8 *buf, size_t len) 6434 { 6435 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6436 struct ieee80211_local *local = sdata->local; 6437 struct sk_buff *skb; 6438 6439 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6440 30 + /* header size */ 6441 18); /* 11s header size */ 6442 if (!skb) 6443 return -ENOMEM; 6444 6445 skb_reserve(skb, local->hw.extra_tx_headroom); 6446 skb_put_data(skb, buf, len); 6447 6448 skb->dev = dev; 6449 skb->protocol = htons(ETH_P_802_3); 6450 skb_reset_network_header(skb); 6451 skb_reset_mac_header(skb); 6452 6453 local_bh_disable(); 6454 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6455 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6456 NULL); 6457 local_bh_enable(); 6458 6459 return 0; 6460 } 6461