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) 2018-2024 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/gso.h> 30 31 #include "ieee80211_i.h" 32 #include "driver-ops.h" 33 #include "led.h" 34 #include "mesh.h" 35 #include "wep.h" 36 #include "wpa.h" 37 #include "wme.h" 38 #include "rate.h" 39 40 /* misc utils */ 41 42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 43 struct sk_buff *skb, int group_addr, 44 int next_frag_len) 45 { 46 int rate, mrate, erp, dur, i; 47 struct ieee80211_rate *txrate; 48 struct ieee80211_local *local = tx->local; 49 struct ieee80211_supported_band *sband; 50 struct ieee80211_hdr *hdr; 51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 52 struct ieee80211_chanctx_conf *chanctx_conf; 53 u32 rate_flags = 0; 54 55 /* assume HW handles this */ 56 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 57 return 0; 58 59 rcu_read_lock(); 60 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 61 if (chanctx_conf) 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 rcu_read_unlock(); 64 65 /* uh huh? */ 66 if (WARN_ON_ONCE(tx->rate.idx < 0)) 67 return 0; 68 69 sband = local->hw.wiphy->bands[info->band]; 70 txrate = &sband->bitrates[tx->rate.idx]; 71 72 erp = txrate->flags & IEEE80211_RATE_ERP_G; 73 74 /* device is expected to do this */ 75 if (sband->band == NL80211_BAND_S1GHZ) 76 return 0; 77 78 /* 79 * data and mgmt (except PS Poll): 80 * - during CFP: 32768 81 * - during contention period: 82 * if addr1 is group address: 0 83 * if more fragments = 0 and addr1 is individual address: time to 84 * transmit one ACK plus SIFS 85 * if more fragments = 1 and addr1 is individual address: time to 86 * transmit next fragment plus 2 x ACK plus 3 x SIFS 87 * 88 * IEEE 802.11, 9.6: 89 * - control response frame (CTS or ACK) shall be transmitted using the 90 * same rate as the immediately previous frame in the frame exchange 91 * sequence, if this rate belongs to the PHY mandatory rates, or else 92 * at the highest possible rate belonging to the PHY rates in the 93 * BSSBasicRateSet 94 */ 95 hdr = (struct ieee80211_hdr *)skb->data; 96 if (ieee80211_is_ctl(hdr->frame_control)) { 97 /* TODO: These control frames are not currently sent by 98 * mac80211, but should they be implemented, this function 99 * needs to be updated to support duration field calculation. 100 * 101 * RTS: time needed to transmit pending data/mgmt frame plus 102 * one CTS frame plus one ACK frame plus 3 x SIFS 103 * CTS: duration of immediately previous RTS minus time 104 * required to transmit CTS and its SIFS 105 * ACK: 0 if immediately previous directed data/mgmt had 106 * more=0, with more=1 duration in ACK frame is duration 107 * from previous frame minus time needed to transmit ACK 108 * and its SIFS 109 * PS Poll: BIT(15) | BIT(14) | aid 110 */ 111 return 0; 112 } 113 114 /* data/mgmt */ 115 if (0 /* FIX: data/mgmt during CFP */) 116 return cpu_to_le16(32768); 117 118 if (group_addr) /* Group address as the destination - no ACK */ 119 return 0; 120 121 /* Individual destination address: 122 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 123 * CTS and ACK frames shall be transmitted using the highest rate in 124 * basic rate set that is less than or equal to the rate of the 125 * immediately previous frame and that is using the same modulation 126 * (CCK or OFDM). If no basic rate set matches with these requirements, 127 * the highest mandatory rate of the PHY that is less than or equal to 128 * the rate of the previous frame is used. 129 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 130 */ 131 rate = -1; 132 /* use lowest available if everything fails */ 133 mrate = sband->bitrates[0].bitrate; 134 for (i = 0; i < sband->n_bitrates; i++) { 135 struct ieee80211_rate *r = &sband->bitrates[i]; 136 u32 flag; 137 138 if (r->bitrate > txrate->bitrate) 139 break; 140 141 if ((rate_flags & r->flags) != rate_flags) 142 continue; 143 144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 145 rate = r->bitrate; 146 147 switch (sband->band) { 148 case NL80211_BAND_2GHZ: 149 case NL80211_BAND_LC: 150 if (tx->sdata->deflink.operating_11g_mode) 151 flag = IEEE80211_RATE_MANDATORY_G; 152 else 153 flag = IEEE80211_RATE_MANDATORY_B; 154 break; 155 case NL80211_BAND_5GHZ: 156 case NL80211_BAND_6GHZ: 157 flag = IEEE80211_RATE_MANDATORY_A; 158 break; 159 default: 160 flag = 0; 161 WARN_ON(1); 162 break; 163 } 164 165 if (r->flags & flag) 166 mrate = r->bitrate; 167 } 168 if (rate == -1) { 169 /* No matching basic rate found; use highest suitable mandatory 170 * PHY rate */ 171 rate = mrate; 172 } 173 174 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 175 if (ieee80211_is_data_qos(hdr->frame_control) && 176 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 177 dur = 0; 178 else 179 /* Time needed to transmit ACK 180 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 181 * to closest integer */ 182 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 183 tx->sdata->vif.bss_conf.use_short_preamble); 184 185 if (next_frag_len) { 186 /* Frame is fragmented: duration increases with time needed to 187 * transmit next fragment plus ACK and 2 x SIFS. */ 188 dur *= 2; /* ACK + SIFS */ 189 /* next fragment */ 190 dur += ieee80211_frame_duration(sband->band, next_frag_len, 191 txrate->bitrate, erp, 192 tx->sdata->vif.bss_conf.use_short_preamble); 193 } 194 195 return cpu_to_le16(dur); 196 } 197 198 /* tx handlers */ 199 static ieee80211_tx_result debug_noinline 200 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 201 { 202 struct ieee80211_local *local = tx->local; 203 struct ieee80211_if_managed *ifmgd; 204 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 205 206 /* driver doesn't support power save */ 207 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 208 return TX_CONTINUE; 209 210 /* hardware does dynamic power save */ 211 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 212 return TX_CONTINUE; 213 214 /* dynamic power save disabled */ 215 if (local->hw.conf.dynamic_ps_timeout <= 0) 216 return TX_CONTINUE; 217 218 /* we are scanning, don't enable power save */ 219 if (local->scanning) 220 return TX_CONTINUE; 221 222 if (!local->ps_sdata) 223 return TX_CONTINUE; 224 225 /* No point if we're going to suspend */ 226 if (local->quiescing) 227 return TX_CONTINUE; 228 229 /* dynamic ps is supported only in managed mode */ 230 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 231 return TX_CONTINUE; 232 233 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 234 return TX_CONTINUE; 235 236 ifmgd = &tx->sdata->u.mgd; 237 238 /* 239 * Don't wakeup from power save if u-apsd is enabled, voip ac has 240 * u-apsd enabled and the frame is in voip class. This effectively 241 * means that even if all access categories have u-apsd enabled, in 242 * practise u-apsd is only used with the voip ac. This is a 243 * workaround for the case when received voip class packets do not 244 * have correct qos tag for some reason, due the network or the 245 * peer application. 246 * 247 * Note: ifmgd->uapsd_queues access is racy here. If the value is 248 * changed via debugfs, user needs to reassociate manually to have 249 * everything in sync. 250 */ 251 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 252 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 253 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 254 return TX_CONTINUE; 255 256 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 257 ieee80211_stop_queues_by_reason(&local->hw, 258 IEEE80211_MAX_QUEUE_MAP, 259 IEEE80211_QUEUE_STOP_REASON_PS, 260 false); 261 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 262 wiphy_work_queue(local->hw.wiphy, 263 &local->dynamic_ps_disable_work); 264 } 265 266 /* Don't restart the timer if we're not disassociated */ 267 if (!ifmgd->associated) 268 return TX_CONTINUE; 269 270 mod_timer(&local->dynamic_ps_timer, jiffies + 271 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 272 273 return TX_CONTINUE; 274 } 275 276 static ieee80211_tx_result debug_noinline 277 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 278 { 279 280 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 281 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 282 bool assoc = false; 283 284 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 285 return TX_CONTINUE; 286 287 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 288 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 289 !ieee80211_is_probe_req(hdr->frame_control) && 290 !ieee80211_is_any_nullfunc(hdr->frame_control)) 291 /* 292 * When software scanning only nullfunc frames (to notify 293 * the sleep state to the AP) and probe requests (for the 294 * active scan) are allowed, all other frames should not be 295 * sent and we should not get here, but if we do 296 * nonetheless, drop them to avoid sending them 297 * off-channel. See the link below and 298 * ieee80211_start_scan() for more. 299 * 300 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 301 */ 302 return TX_DROP; 303 304 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 305 return TX_CONTINUE; 306 307 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 308 return TX_CONTINUE; 309 310 if (tx->sta) 311 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 312 313 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 314 if (unlikely(!assoc && 315 ieee80211_is_data(hdr->frame_control))) { 316 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 317 sdata_info(tx->sdata, 318 "dropped data frame to not associated station %pM\n", 319 hdr->addr1); 320 #endif 321 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 322 return TX_DROP; 323 } 324 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 325 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 326 /* 327 * No associated STAs - no need to send multicast 328 * frames. 329 */ 330 return TX_DROP; 331 } 332 333 return TX_CONTINUE; 334 } 335 336 /* This function is called whenever the AP is about to exceed the maximum limit 337 * of buffered frames for power saving STAs. This situation should not really 338 * happen often during normal operation, so dropping the oldest buffered packet 339 * from each queue should be OK to make some room for new frames. */ 340 static void purge_old_ps_buffers(struct ieee80211_local *local) 341 { 342 int total = 0, purged = 0; 343 struct sk_buff *skb; 344 struct ieee80211_sub_if_data *sdata; 345 struct sta_info *sta; 346 347 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 348 struct ps_data *ps; 349 350 if (sdata->vif.type == NL80211_IFTYPE_AP) 351 ps = &sdata->u.ap.ps; 352 else if (ieee80211_vif_is_mesh(&sdata->vif)) 353 ps = &sdata->u.mesh.ps; 354 else 355 continue; 356 357 skb = skb_dequeue(&ps->bc_buf); 358 if (skb) { 359 purged++; 360 ieee80211_free_txskb(&local->hw, skb); 361 } 362 total += skb_queue_len(&ps->bc_buf); 363 } 364 365 /* 366 * Drop one frame from each station from the lowest-priority 367 * AC that has frames at all. 368 */ 369 list_for_each_entry_rcu(sta, &local->sta_list, list) { 370 int ac; 371 372 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 373 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 374 total += skb_queue_len(&sta->ps_tx_buf[ac]); 375 if (skb) { 376 purged++; 377 ieee80211_free_txskb(&local->hw, skb); 378 break; 379 } 380 } 381 } 382 383 local->total_ps_buffered = total; 384 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 385 } 386 387 static ieee80211_tx_result 388 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 389 { 390 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 391 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 392 struct ps_data *ps; 393 394 /* 395 * broadcast/multicast frame 396 * 397 * If any of the associated/peer stations is in power save mode, 398 * the frame is buffered to be sent after DTIM beacon frame. 399 * This is done either by the hardware or us. 400 */ 401 402 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 403 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 404 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 405 if (!tx->sdata->bss) 406 return TX_CONTINUE; 407 408 ps = &tx->sdata->bss->ps; 409 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 410 ps = &tx->sdata->u.mesh.ps; 411 } else { 412 return TX_CONTINUE; 413 } 414 415 416 /* no buffering for ordered frames */ 417 if (ieee80211_has_order(hdr->frame_control)) 418 return TX_CONTINUE; 419 420 if (ieee80211_is_probe_req(hdr->frame_control)) 421 return TX_CONTINUE; 422 423 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 424 info->hw_queue = tx->sdata->vif.cab_queue; 425 426 /* no stations in PS mode and no buffered packets */ 427 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 428 return TX_CONTINUE; 429 430 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 431 432 /* device releases frame after DTIM beacon */ 433 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 434 return TX_CONTINUE; 435 436 /* buffered in mac80211 */ 437 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 438 purge_old_ps_buffers(tx->local); 439 440 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 441 ps_dbg(tx->sdata, 442 "BC TX buffer full - dropping the oldest frame\n"); 443 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 444 } else 445 tx->local->total_ps_buffered++; 446 447 skb_queue_tail(&ps->bc_buf, tx->skb); 448 449 return TX_QUEUED; 450 } 451 452 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 453 struct sk_buff *skb) 454 { 455 if (!ieee80211_is_mgmt(fc)) 456 return 0; 457 458 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 459 return 0; 460 461 if (!ieee80211_is_robust_mgmt_frame(skb)) 462 return 0; 463 464 return 1; 465 } 466 467 static ieee80211_tx_result 468 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 469 { 470 struct sta_info *sta = tx->sta; 471 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 472 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 473 struct ieee80211_local *local = tx->local; 474 475 if (unlikely(!sta)) 476 return TX_CONTINUE; 477 478 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 479 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 480 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 481 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 482 int ac = skb_get_queue_mapping(tx->skb); 483 484 if (ieee80211_is_mgmt(hdr->frame_control) && 485 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 486 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 487 return TX_CONTINUE; 488 } 489 490 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 491 sta->sta.addr, sta->sta.aid, ac); 492 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 493 purge_old_ps_buffers(tx->local); 494 495 /* sync with ieee80211_sta_ps_deliver_wakeup */ 496 spin_lock(&sta->ps_lock); 497 /* 498 * STA woke up the meantime and all the frames on ps_tx_buf have 499 * been queued to pending queue. No reordering can happen, go 500 * ahead and Tx the packet. 501 */ 502 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 503 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 504 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 505 spin_unlock(&sta->ps_lock); 506 return TX_CONTINUE; 507 } 508 509 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 510 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 511 ps_dbg(tx->sdata, 512 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 513 sta->sta.addr, ac); 514 ieee80211_free_txskb(&local->hw, old); 515 } else 516 tx->local->total_ps_buffered++; 517 518 info->control.jiffies = jiffies; 519 info->control.vif = &tx->sdata->vif; 520 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 521 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 522 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 523 spin_unlock(&sta->ps_lock); 524 525 if (!timer_pending(&local->sta_cleanup)) 526 mod_timer(&local->sta_cleanup, 527 round_jiffies(jiffies + 528 STA_INFO_CLEANUP_INTERVAL)); 529 530 /* 531 * We queued up some frames, so the TIM bit might 532 * need to be set, recalculate it. 533 */ 534 sta_info_recalc_tim(sta); 535 536 return TX_QUEUED; 537 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 538 ps_dbg(tx->sdata, 539 "STA %pM in PS mode, but polling/in SP -> send frame\n", 540 sta->sta.addr); 541 } 542 543 return TX_CONTINUE; 544 } 545 546 static ieee80211_tx_result debug_noinline 547 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 548 { 549 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 550 return TX_CONTINUE; 551 552 if (tx->flags & IEEE80211_TX_UNICAST) 553 return ieee80211_tx_h_unicast_ps_buf(tx); 554 else 555 return ieee80211_tx_h_multicast_ps_buf(tx); 556 } 557 558 static ieee80211_tx_result debug_noinline 559 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 560 { 561 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 562 563 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 564 if (tx->sdata->control_port_no_encrypt) 565 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 566 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 567 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 568 } 569 570 return TX_CONTINUE; 571 } 572 573 static struct ieee80211_key * 574 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 575 { 576 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 578 struct ieee80211_link_data *link; 579 unsigned int link_id; 580 581 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 582 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 583 link = &tx->sdata->deflink; 584 } else { 585 link = rcu_dereference(tx->sdata->link[link_id]); 586 if (!link) 587 return NULL; 588 } 589 590 if (ieee80211_is_group_privacy_action(tx->skb)) 591 return rcu_dereference(link->default_multicast_key); 592 else if (ieee80211_is_mgmt(hdr->frame_control) && 593 is_multicast_ether_addr(hdr->addr1) && 594 ieee80211_is_robust_mgmt_frame(tx->skb)) 595 return rcu_dereference(link->default_mgmt_key); 596 else if (is_multicast_ether_addr(hdr->addr1)) 597 return rcu_dereference(link->default_multicast_key); 598 599 return NULL; 600 } 601 602 static ieee80211_tx_result debug_noinline 603 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 604 { 605 struct ieee80211_key *key; 606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 607 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 608 609 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 610 tx->key = NULL; 611 return TX_CONTINUE; 612 } 613 614 if (tx->sta && 615 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 616 tx->key = key; 617 else if ((key = ieee80211_select_link_key(tx))) 618 tx->key = key; 619 else if (!is_multicast_ether_addr(hdr->addr1) && 620 (key = rcu_dereference(tx->sdata->default_unicast_key))) 621 tx->key = key; 622 else 623 tx->key = NULL; 624 625 if (tx->key) { 626 bool skip_hw = false; 627 628 /* TODO: add threshold stuff again */ 629 630 switch (tx->key->conf.cipher) { 631 case WLAN_CIPHER_SUITE_WEP40: 632 case WLAN_CIPHER_SUITE_WEP104: 633 case WLAN_CIPHER_SUITE_TKIP: 634 if (!ieee80211_is_data_present(hdr->frame_control)) 635 tx->key = NULL; 636 break; 637 case WLAN_CIPHER_SUITE_CCMP: 638 case WLAN_CIPHER_SUITE_CCMP_256: 639 case WLAN_CIPHER_SUITE_GCMP: 640 case WLAN_CIPHER_SUITE_GCMP_256: 641 if (!ieee80211_is_data_present(hdr->frame_control) && 642 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 643 tx->skb) && 644 !ieee80211_is_group_privacy_action(tx->skb)) 645 tx->key = NULL; 646 else 647 skip_hw = (tx->key->conf.flags & 648 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 649 ieee80211_is_mgmt(hdr->frame_control); 650 break; 651 case WLAN_CIPHER_SUITE_AES_CMAC: 652 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 653 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 654 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 655 if (!ieee80211_is_mgmt(hdr->frame_control)) 656 tx->key = NULL; 657 break; 658 } 659 660 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 661 !ieee80211_is_deauth(hdr->frame_control)) && 662 tx->skb->protocol != tx->sdata->control_port_protocol) 663 return TX_DROP; 664 665 if (!skip_hw && tx->key && 666 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 667 info->control.hw_key = &tx->key->conf; 668 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 669 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 670 return TX_DROP; 671 } 672 673 return TX_CONTINUE; 674 } 675 676 static ieee80211_tx_result debug_noinline 677 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 678 { 679 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 680 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 681 struct ieee80211_supported_band *sband; 682 u32 len; 683 struct ieee80211_tx_rate_control txrc; 684 struct ieee80211_sta_rates *ratetbl = NULL; 685 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 686 bool assoc = false; 687 688 memset(&txrc, 0, sizeof(txrc)); 689 690 sband = tx->local->hw.wiphy->bands[info->band]; 691 692 len = min_t(u32, tx->skb->len + FCS_LEN, 693 tx->local->hw.wiphy->frag_threshold); 694 695 /* set up the tx rate control struct we give the RC algo */ 696 txrc.hw = &tx->local->hw; 697 txrc.sband = sband; 698 txrc.bss_conf = &tx->sdata->vif.bss_conf; 699 txrc.skb = tx->skb; 700 txrc.reported_rate.idx = -1; 701 702 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 703 txrc.rate_idx_mask = ~0; 704 } else { 705 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 706 707 if (tx->sdata->rc_has_mcs_mask[info->band]) 708 txrc.rate_idx_mcs_mask = 709 tx->sdata->rc_rateidx_mcs_mask[info->band]; 710 } 711 712 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 713 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 714 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 715 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 716 717 /* set up RTS protection if desired */ 718 if (len > tx->local->hw.wiphy->rts_threshold) { 719 txrc.rts = true; 720 } 721 722 info->control.use_rts = txrc.rts; 723 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 724 725 /* 726 * Use short preamble if the BSS can handle it, but not for 727 * management frames unless we know the receiver can handle 728 * that -- the management frame might be to a station that 729 * just wants a probe response. 730 */ 731 if (tx->sdata->vif.bss_conf.use_short_preamble && 732 (ieee80211_is_tx_data(tx->skb) || 733 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 734 txrc.short_preamble = true; 735 736 info->control.short_preamble = txrc.short_preamble; 737 738 /* don't ask rate control when rate already injected via radiotap */ 739 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 740 return TX_CONTINUE; 741 742 if (tx->sta) 743 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 744 745 /* 746 * Lets not bother rate control if we're associated and cannot 747 * talk to the sta. This should not happen. 748 */ 749 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 750 !rate_usable_index_exists(sband, &tx->sta->sta), 751 "%s: Dropped data frame as no usable bitrate found while " 752 "scanning and associated. Target station: " 753 "%pM on %d GHz band\n", 754 tx->sdata->name, 755 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 756 info->band ? 5 : 2)) 757 return TX_DROP; 758 759 /* 760 * If we're associated with the sta at this point we know we can at 761 * least send the frame at the lowest bit rate. 762 */ 763 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 764 765 if (tx->sta && !info->control.skip_table) 766 ratetbl = rcu_dereference(tx->sta->sta.rates); 767 768 if (unlikely(info->control.rates[0].idx < 0)) { 769 if (ratetbl) { 770 struct ieee80211_tx_rate rate = { 771 .idx = ratetbl->rate[0].idx, 772 .flags = ratetbl->rate[0].flags, 773 .count = ratetbl->rate[0].count 774 }; 775 776 if (ratetbl->rate[0].idx < 0) 777 return TX_DROP; 778 779 tx->rate = rate; 780 } else { 781 return TX_DROP; 782 } 783 } else { 784 tx->rate = info->control.rates[0]; 785 } 786 787 if (txrc.reported_rate.idx < 0) { 788 txrc.reported_rate = tx->rate; 789 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 790 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 791 } else if (tx->sta) 792 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 793 794 if (ratetbl) 795 return TX_CONTINUE; 796 797 if (unlikely(!info->control.rates[0].count)) 798 info->control.rates[0].count = 1; 799 800 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 801 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 802 info->control.rates[0].count = 1; 803 804 return TX_CONTINUE; 805 } 806 807 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 808 { 809 u16 *seq = &sta->tid_seq[tid]; 810 __le16 ret = cpu_to_le16(*seq); 811 812 /* Increase the sequence number. */ 813 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 814 815 return ret; 816 } 817 818 static ieee80211_tx_result debug_noinline 819 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 820 { 821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 822 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 823 int tid; 824 825 /* 826 * Packet injection may want to control the sequence 827 * number, if we have no matching interface then we 828 * neither assign one ourselves nor ask the driver to. 829 */ 830 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 831 return TX_CONTINUE; 832 833 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 834 return TX_CONTINUE; 835 836 if (ieee80211_hdrlen(hdr->frame_control) < 24) 837 return TX_CONTINUE; 838 839 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 840 return TX_CONTINUE; 841 842 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 843 return TX_CONTINUE; 844 845 /* SNS11 from 802.11be 10.3.2.14 */ 846 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 847 ieee80211_vif_is_mld(info->control.vif) && 848 info->control.vif->type == NL80211_IFTYPE_AP)) { 849 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 850 tx->sdata->mld_mcast_seq += 0x10; 851 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 852 return TX_CONTINUE; 853 } 854 855 /* 856 * Anything but QoS data that has a sequence number field 857 * (is long enough) gets a sequence number from the global 858 * counter. QoS data frames with a multicast destination 859 * also use the global counter (802.11-2012 9.3.2.10). 860 */ 861 if (!ieee80211_is_data_qos(hdr->frame_control) || 862 is_multicast_ether_addr(hdr->addr1)) { 863 /* driver should assign sequence number */ 864 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 865 /* for pure STA mode without beacons, we can do it */ 866 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 867 tx->sdata->sequence_number += 0x10; 868 if (tx->sta) 869 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 870 return TX_CONTINUE; 871 } 872 873 /* 874 * This should be true for injected/management frames only, for 875 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 876 * above since they are not QoS-data frames. 877 */ 878 if (!tx->sta) 879 return TX_CONTINUE; 880 881 /* include per-STA, per-TID sequence counter */ 882 tid = ieee80211_get_tid(hdr); 883 tx->sta->deflink.tx_stats.msdu[tid]++; 884 885 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 886 887 return TX_CONTINUE; 888 } 889 890 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 891 struct sk_buff *skb, int hdrlen, 892 int frag_threshold) 893 { 894 struct ieee80211_local *local = tx->local; 895 struct ieee80211_tx_info *info; 896 struct sk_buff *tmp; 897 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 898 int pos = hdrlen + per_fragm; 899 int rem = skb->len - hdrlen - per_fragm; 900 901 if (WARN_ON(rem < 0)) 902 return -EINVAL; 903 904 /* first fragment was already added to queue by caller */ 905 906 while (rem) { 907 int fraglen = per_fragm; 908 909 if (fraglen > rem) 910 fraglen = rem; 911 rem -= fraglen; 912 tmp = dev_alloc_skb(local->tx_headroom + 913 frag_threshold + 914 IEEE80211_ENCRYPT_HEADROOM + 915 IEEE80211_ENCRYPT_TAILROOM); 916 if (!tmp) 917 return -ENOMEM; 918 919 __skb_queue_tail(&tx->skbs, tmp); 920 921 skb_reserve(tmp, 922 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 923 924 /* copy control information */ 925 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 926 927 info = IEEE80211_SKB_CB(tmp); 928 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 929 IEEE80211_TX_CTL_FIRST_FRAGMENT); 930 931 if (rem) 932 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 933 934 skb_copy_queue_mapping(tmp, skb); 935 tmp->priority = skb->priority; 936 tmp->dev = skb->dev; 937 938 /* copy header and data */ 939 skb_put_data(tmp, skb->data, hdrlen); 940 skb_put_data(tmp, skb->data + pos, fraglen); 941 942 pos += fraglen; 943 } 944 945 /* adjust first fragment's length */ 946 skb_trim(skb, hdrlen + per_fragm); 947 return 0; 948 } 949 950 static ieee80211_tx_result debug_noinline 951 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 952 { 953 struct sk_buff *skb = tx->skb; 954 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 955 struct ieee80211_hdr *hdr = (void *)skb->data; 956 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 957 int hdrlen; 958 int fragnum; 959 960 /* no matter what happens, tx->skb moves to tx->skbs */ 961 __skb_queue_tail(&tx->skbs, skb); 962 tx->skb = NULL; 963 964 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 965 return TX_CONTINUE; 966 967 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 968 return TX_CONTINUE; 969 970 /* 971 * Warn when submitting a fragmented A-MPDU frame and drop it. 972 * This scenario is handled in ieee80211_tx_prepare but extra 973 * caution taken here as fragmented ampdu may cause Tx stop. 974 */ 975 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 976 return TX_DROP; 977 978 hdrlen = ieee80211_hdrlen(hdr->frame_control); 979 980 /* internal error, why isn't DONTFRAG set? */ 981 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 982 return TX_DROP; 983 984 /* 985 * Now fragment the frame. This will allocate all the fragments and 986 * chain them (using skb as the first fragment) to skb->next. 987 * During transmission, we will remove the successfully transmitted 988 * fragments from this list. When the low-level driver rejects one 989 * of the fragments then we will simply pretend to accept the skb 990 * but store it away as pending. 991 */ 992 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 993 return TX_DROP; 994 995 /* update duration/seq/flags of fragments */ 996 fragnum = 0; 997 998 skb_queue_walk(&tx->skbs, skb) { 999 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1000 1001 hdr = (void *)skb->data; 1002 info = IEEE80211_SKB_CB(skb); 1003 1004 if (!skb_queue_is_last(&tx->skbs, skb)) { 1005 hdr->frame_control |= morefrags; 1006 /* 1007 * No multi-rate retries for fragmented frames, that 1008 * would completely throw off the NAV at other STAs. 1009 */ 1010 info->control.rates[1].idx = -1; 1011 info->control.rates[2].idx = -1; 1012 info->control.rates[3].idx = -1; 1013 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1014 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1015 } else { 1016 hdr->frame_control &= ~morefrags; 1017 } 1018 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1019 fragnum++; 1020 } 1021 1022 return TX_CONTINUE; 1023 } 1024 1025 static ieee80211_tx_result debug_noinline 1026 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1027 { 1028 struct sk_buff *skb; 1029 int ac = -1; 1030 1031 if (!tx->sta) 1032 return TX_CONTINUE; 1033 1034 skb_queue_walk(&tx->skbs, skb) { 1035 ac = skb_get_queue_mapping(skb); 1036 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1037 } 1038 if (ac >= 0) 1039 tx->sta->deflink.tx_stats.packets[ac]++; 1040 1041 return TX_CONTINUE; 1042 } 1043 1044 static ieee80211_tx_result debug_noinline 1045 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1046 { 1047 if (!tx->key) 1048 return TX_CONTINUE; 1049 1050 switch (tx->key->conf.cipher) { 1051 case WLAN_CIPHER_SUITE_WEP40: 1052 case WLAN_CIPHER_SUITE_WEP104: 1053 return ieee80211_crypto_wep_encrypt(tx); 1054 case WLAN_CIPHER_SUITE_TKIP: 1055 return ieee80211_crypto_tkip_encrypt(tx); 1056 case WLAN_CIPHER_SUITE_CCMP: 1057 return ieee80211_crypto_ccmp_encrypt( 1058 tx, IEEE80211_CCMP_MIC_LEN); 1059 case WLAN_CIPHER_SUITE_CCMP_256: 1060 return ieee80211_crypto_ccmp_encrypt( 1061 tx, IEEE80211_CCMP_256_MIC_LEN); 1062 case WLAN_CIPHER_SUITE_AES_CMAC: 1063 return ieee80211_crypto_aes_cmac_encrypt(tx); 1064 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1065 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1066 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1067 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1068 return ieee80211_crypto_aes_gmac_encrypt(tx); 1069 case WLAN_CIPHER_SUITE_GCMP: 1070 case WLAN_CIPHER_SUITE_GCMP_256: 1071 return ieee80211_crypto_gcmp_encrypt(tx); 1072 } 1073 1074 return TX_DROP; 1075 } 1076 1077 static ieee80211_tx_result debug_noinline 1078 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1079 { 1080 struct sk_buff *skb; 1081 struct ieee80211_hdr *hdr; 1082 int next_len; 1083 bool group_addr; 1084 1085 skb_queue_walk(&tx->skbs, skb) { 1086 hdr = (void *) skb->data; 1087 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1088 break; /* must not overwrite AID */ 1089 if (!skb_queue_is_last(&tx->skbs, skb)) { 1090 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1091 next_len = next->len; 1092 } else 1093 next_len = 0; 1094 group_addr = is_multicast_ether_addr(hdr->addr1); 1095 1096 hdr->duration_id = 1097 ieee80211_duration(tx, skb, group_addr, next_len); 1098 } 1099 1100 return TX_CONTINUE; 1101 } 1102 1103 /* actual transmit path */ 1104 1105 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1106 struct sk_buff *skb, 1107 struct ieee80211_tx_info *info, 1108 struct tid_ampdu_tx *tid_tx, 1109 int tid) 1110 { 1111 bool queued = false; 1112 bool reset_agg_timer = false; 1113 struct sk_buff *purge_skb = NULL; 1114 1115 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1116 reset_agg_timer = true; 1117 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1118 /* 1119 * nothing -- this aggregation session is being started 1120 * but that might still fail with the driver 1121 */ 1122 } else if (!tx->sta->sta.txq[tid]) { 1123 spin_lock(&tx->sta->lock); 1124 /* 1125 * Need to re-check now, because we may get here 1126 * 1127 * 1) in the window during which the setup is actually 1128 * already done, but not marked yet because not all 1129 * packets are spliced over to the driver pending 1130 * queue yet -- if this happened we acquire the lock 1131 * either before or after the splice happens, but 1132 * need to recheck which of these cases happened. 1133 * 1134 * 2) during session teardown, if the OPERATIONAL bit 1135 * was cleared due to the teardown but the pointer 1136 * hasn't been assigned NULL yet (or we loaded it 1137 * before it was assigned) -- in this case it may 1138 * now be NULL which means we should just let the 1139 * packet pass through because splicing the frames 1140 * back is already done. 1141 */ 1142 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1143 1144 if (!tid_tx) { 1145 /* do nothing, let packet pass through */ 1146 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1147 reset_agg_timer = true; 1148 } else { 1149 queued = true; 1150 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1151 clear_sta_flag(tx->sta, WLAN_STA_SP); 1152 ps_dbg(tx->sta->sdata, 1153 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1154 tx->sta->sta.addr, tx->sta->sta.aid); 1155 } 1156 info->control.vif = &tx->sdata->vif; 1157 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1158 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1159 __skb_queue_tail(&tid_tx->pending, skb); 1160 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1161 purge_skb = __skb_dequeue(&tid_tx->pending); 1162 } 1163 spin_unlock(&tx->sta->lock); 1164 1165 if (purge_skb) 1166 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1167 } 1168 1169 /* reset session timer */ 1170 if (reset_agg_timer) 1171 tid_tx->last_tx = jiffies; 1172 1173 return queued; 1174 } 1175 1176 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1177 struct sta_info *sta, struct sk_buff *skb) 1178 { 1179 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1180 u16 tid; 1181 1182 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1183 return; 1184 1185 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1186 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1187 skb->protocol == sdata->control_port_protocol) 1188 return; 1189 1190 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1191 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1192 return; 1193 1194 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1195 } 1196 1197 /* 1198 * initialises @tx 1199 * pass %NULL for the station if unknown, a valid pointer if known 1200 * or an ERR_PTR() if the station is known not to exist 1201 */ 1202 static ieee80211_tx_result 1203 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1204 struct ieee80211_tx_data *tx, 1205 struct sta_info *sta, struct sk_buff *skb) 1206 { 1207 struct ieee80211_local *local = sdata->local; 1208 struct ieee80211_hdr *hdr; 1209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1210 bool aggr_check = false; 1211 int tid; 1212 1213 memset(tx, 0, sizeof(*tx)); 1214 tx->skb = skb; 1215 tx->local = local; 1216 tx->sdata = sdata; 1217 __skb_queue_head_init(&tx->skbs); 1218 1219 /* 1220 * If this flag is set to true anywhere, and we get here, 1221 * we are doing the needed processing, so remove the flag 1222 * now. 1223 */ 1224 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1225 1226 hdr = (struct ieee80211_hdr *) skb->data; 1227 1228 if (likely(sta)) { 1229 if (!IS_ERR(sta)) 1230 tx->sta = sta; 1231 } else { 1232 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1233 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1234 if (!tx->sta && sdata->wdev.use_4addr) 1235 return TX_DROP; 1236 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1237 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1238 } 1239 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1240 tx->sta = sta_info_get(sdata, hdr->addr1); 1241 aggr_check = true; 1242 } 1243 } 1244 1245 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1246 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1247 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1248 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1249 struct tid_ampdu_tx *tid_tx; 1250 1251 tid = ieee80211_get_tid(hdr); 1252 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1253 if (!tid_tx && aggr_check) { 1254 ieee80211_aggr_check(sdata, tx->sta, skb); 1255 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1256 } 1257 1258 if (tid_tx) { 1259 bool queued; 1260 1261 queued = ieee80211_tx_prep_agg(tx, skb, info, 1262 tid_tx, tid); 1263 1264 if (unlikely(queued)) 1265 return TX_QUEUED; 1266 } 1267 } 1268 1269 if (is_multicast_ether_addr(hdr->addr1)) { 1270 tx->flags &= ~IEEE80211_TX_UNICAST; 1271 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1272 } else 1273 tx->flags |= IEEE80211_TX_UNICAST; 1274 1275 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1276 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1277 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1278 info->flags & IEEE80211_TX_CTL_AMPDU) 1279 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1280 } 1281 1282 if (!tx->sta) 1283 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1284 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1285 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1286 ieee80211_check_fast_xmit(tx->sta); 1287 } 1288 1289 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1290 1291 return TX_CONTINUE; 1292 } 1293 1294 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1295 struct ieee80211_vif *vif, 1296 struct sta_info *sta, 1297 struct sk_buff *skb) 1298 { 1299 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1300 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1301 struct ieee80211_txq *txq = NULL; 1302 1303 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1304 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1305 return NULL; 1306 1307 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1308 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1309 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1310 ieee80211_is_bufferable_mmpdu(skb) || 1311 vif->type == NL80211_IFTYPE_STATION) && 1312 sta && sta->uploaded) { 1313 /* 1314 * This will be NULL if the driver didn't set the 1315 * opt-in hardware flag. 1316 */ 1317 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1318 } 1319 } else if (sta) { 1320 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1321 1322 if (!sta->uploaded) 1323 return NULL; 1324 1325 txq = sta->sta.txq[tid]; 1326 } else { 1327 txq = vif->txq; 1328 } 1329 1330 if (!txq) 1331 return NULL; 1332 1333 return to_txq_info(txq); 1334 } 1335 1336 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1337 { 1338 struct sk_buff *next; 1339 codel_time_t now = codel_get_time(); 1340 1341 skb_list_walk_safe(skb, skb, next) 1342 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1343 } 1344 1345 static u32 codel_skb_len_func(const struct sk_buff *skb) 1346 { 1347 return skb->len; 1348 } 1349 1350 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1351 { 1352 const struct ieee80211_tx_info *info; 1353 1354 info = (const struct ieee80211_tx_info *)skb->cb; 1355 return info->control.enqueue_time; 1356 } 1357 1358 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1359 void *ctx) 1360 { 1361 struct ieee80211_local *local; 1362 struct txq_info *txqi; 1363 struct fq *fq; 1364 struct fq_flow *flow; 1365 1366 txqi = ctx; 1367 local = vif_to_sdata(txqi->txq.vif)->local; 1368 fq = &local->fq; 1369 1370 if (cvars == &txqi->def_cvars) 1371 flow = &txqi->tin.default_flow; 1372 else 1373 flow = &fq->flows[cvars - local->cvars]; 1374 1375 return fq_flow_dequeue(fq, flow); 1376 } 1377 1378 static void codel_drop_func(struct sk_buff *skb, 1379 void *ctx) 1380 { 1381 struct ieee80211_local *local; 1382 struct ieee80211_hw *hw; 1383 struct txq_info *txqi; 1384 1385 txqi = ctx; 1386 local = vif_to_sdata(txqi->txq.vif)->local; 1387 hw = &local->hw; 1388 1389 ieee80211_free_txskb(hw, skb); 1390 } 1391 1392 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1393 struct fq_tin *tin, 1394 struct fq_flow *flow) 1395 { 1396 struct ieee80211_local *local; 1397 struct txq_info *txqi; 1398 struct codel_vars *cvars; 1399 struct codel_params *cparams; 1400 struct codel_stats *cstats; 1401 1402 local = container_of(fq, struct ieee80211_local, fq); 1403 txqi = container_of(tin, struct txq_info, tin); 1404 cstats = &txqi->cstats; 1405 1406 if (txqi->txq.sta) { 1407 struct sta_info *sta = container_of(txqi->txq.sta, 1408 struct sta_info, sta); 1409 cparams = &sta->cparams; 1410 } else { 1411 cparams = &local->cparams; 1412 } 1413 1414 if (flow == &tin->default_flow) 1415 cvars = &txqi->def_cvars; 1416 else 1417 cvars = &local->cvars[flow - fq->flows]; 1418 1419 return codel_dequeue(txqi, 1420 &flow->backlog, 1421 cparams, 1422 cvars, 1423 cstats, 1424 codel_skb_len_func, 1425 codel_skb_time_func, 1426 codel_drop_func, 1427 codel_dequeue_func); 1428 } 1429 1430 static void fq_skb_free_func(struct fq *fq, 1431 struct fq_tin *tin, 1432 struct fq_flow *flow, 1433 struct sk_buff *skb) 1434 { 1435 struct ieee80211_local *local; 1436 1437 local = container_of(fq, struct ieee80211_local, fq); 1438 ieee80211_free_txskb(&local->hw, skb); 1439 } 1440 1441 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1442 struct txq_info *txqi, 1443 struct sk_buff *skb) 1444 { 1445 struct fq *fq = &local->fq; 1446 struct fq_tin *tin = &txqi->tin; 1447 u32 flow_idx = fq_flow_idx(fq, skb); 1448 1449 ieee80211_set_skb_enqueue_time(skb); 1450 1451 spin_lock_bh(&fq->lock); 1452 /* 1453 * For management frames, don't really apply codel etc., 1454 * we don't want to apply any shaping or anything we just 1455 * want to simplify the driver API by having them on the 1456 * txqi. 1457 */ 1458 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1459 IEEE80211_SKB_CB(skb)->control.flags |= 1460 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1461 __skb_queue_tail(&txqi->frags, skb); 1462 } else { 1463 fq_tin_enqueue(fq, tin, flow_idx, skb, 1464 fq_skb_free_func); 1465 } 1466 spin_unlock_bh(&fq->lock); 1467 } 1468 1469 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1470 struct fq_flow *flow, struct sk_buff *skb, 1471 void *data) 1472 { 1473 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1474 1475 return info->control.vif == data; 1476 } 1477 1478 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1479 struct ieee80211_sub_if_data *sdata) 1480 { 1481 struct fq *fq = &local->fq; 1482 struct txq_info *txqi; 1483 struct fq_tin *tin; 1484 struct ieee80211_sub_if_data *ap; 1485 1486 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1487 return; 1488 1489 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1490 1491 if (!ap->vif.txq) 1492 return; 1493 1494 txqi = to_txq_info(ap->vif.txq); 1495 tin = &txqi->tin; 1496 1497 spin_lock_bh(&fq->lock); 1498 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1499 fq_skb_free_func); 1500 spin_unlock_bh(&fq->lock); 1501 } 1502 1503 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1504 struct sta_info *sta, 1505 struct txq_info *txqi, int tid) 1506 { 1507 fq_tin_init(&txqi->tin); 1508 codel_vars_init(&txqi->def_cvars); 1509 codel_stats_init(&txqi->cstats); 1510 __skb_queue_head_init(&txqi->frags); 1511 INIT_LIST_HEAD(&txqi->schedule_order); 1512 1513 txqi->txq.vif = &sdata->vif; 1514 1515 if (!sta) { 1516 sdata->vif.txq = &txqi->txq; 1517 txqi->txq.tid = 0; 1518 txqi->txq.ac = IEEE80211_AC_BE; 1519 1520 return; 1521 } 1522 1523 if (tid == IEEE80211_NUM_TIDS) { 1524 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1525 /* Drivers need to opt in to the management MPDU TXQ */ 1526 if (!ieee80211_hw_check(&sdata->local->hw, 1527 STA_MMPDU_TXQ)) 1528 return; 1529 } else if (!ieee80211_hw_check(&sdata->local->hw, 1530 BUFF_MMPDU_TXQ)) { 1531 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1532 return; 1533 } 1534 txqi->txq.ac = IEEE80211_AC_VO; 1535 } else { 1536 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1537 } 1538 1539 txqi->txq.sta = &sta->sta; 1540 txqi->txq.tid = tid; 1541 sta->sta.txq[tid] = &txqi->txq; 1542 } 1543 1544 void ieee80211_txq_purge(struct ieee80211_local *local, 1545 struct txq_info *txqi) 1546 { 1547 struct fq *fq = &local->fq; 1548 struct fq_tin *tin = &txqi->tin; 1549 1550 spin_lock_bh(&fq->lock); 1551 fq_tin_reset(fq, tin, fq_skb_free_func); 1552 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1553 spin_unlock_bh(&fq->lock); 1554 1555 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1556 list_del_init(&txqi->schedule_order); 1557 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1558 } 1559 1560 void ieee80211_txq_set_params(struct ieee80211_local *local) 1561 { 1562 if (local->hw.wiphy->txq_limit) 1563 local->fq.limit = local->hw.wiphy->txq_limit; 1564 else 1565 local->hw.wiphy->txq_limit = local->fq.limit; 1566 1567 if (local->hw.wiphy->txq_memory_limit) 1568 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1569 else 1570 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1571 1572 if (local->hw.wiphy->txq_quantum) 1573 local->fq.quantum = local->hw.wiphy->txq_quantum; 1574 else 1575 local->hw.wiphy->txq_quantum = local->fq.quantum; 1576 } 1577 1578 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1579 { 1580 struct fq *fq = &local->fq; 1581 int ret; 1582 int i; 1583 bool supp_vht = false; 1584 enum nl80211_band band; 1585 1586 ret = fq_init(fq, 4096); 1587 if (ret) 1588 return ret; 1589 1590 /* 1591 * If the hardware doesn't support VHT, it is safe to limit the maximum 1592 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1593 */ 1594 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1595 struct ieee80211_supported_band *sband; 1596 1597 sband = local->hw.wiphy->bands[band]; 1598 if (!sband) 1599 continue; 1600 1601 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1602 } 1603 1604 if (!supp_vht) 1605 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1606 1607 codel_params_init(&local->cparams); 1608 local->cparams.interval = MS2TIME(100); 1609 local->cparams.target = MS2TIME(20); 1610 local->cparams.ecn = true; 1611 1612 local->cvars = kvcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1613 GFP_KERNEL); 1614 if (!local->cvars) { 1615 spin_lock_bh(&fq->lock); 1616 fq_reset(fq, fq_skb_free_func); 1617 spin_unlock_bh(&fq->lock); 1618 return -ENOMEM; 1619 } 1620 1621 for (i = 0; i < fq->flows_cnt; i++) 1622 codel_vars_init(&local->cvars[i]); 1623 1624 ieee80211_txq_set_params(local); 1625 1626 return 0; 1627 } 1628 1629 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1630 { 1631 struct fq *fq = &local->fq; 1632 1633 kvfree(local->cvars); 1634 local->cvars = NULL; 1635 1636 spin_lock_bh(&fq->lock); 1637 fq_reset(fq, fq_skb_free_func); 1638 spin_unlock_bh(&fq->lock); 1639 } 1640 1641 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1642 struct ieee80211_sub_if_data *sdata, 1643 struct sta_info *sta, 1644 struct sk_buff *skb) 1645 { 1646 struct ieee80211_vif *vif; 1647 struct txq_info *txqi; 1648 1649 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1650 return false; 1651 1652 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1653 sdata = container_of(sdata->bss, 1654 struct ieee80211_sub_if_data, u.ap); 1655 1656 vif = &sdata->vif; 1657 txqi = ieee80211_get_txq(local, vif, sta, skb); 1658 1659 if (!txqi) 1660 return false; 1661 1662 ieee80211_txq_enqueue(local, txqi, skb); 1663 1664 schedule_and_wake_txq(local, txqi); 1665 1666 return true; 1667 } 1668 1669 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1670 struct ieee80211_vif *vif, 1671 struct sta_info *sta, 1672 struct sk_buff_head *skbs, 1673 bool txpending) 1674 { 1675 struct ieee80211_tx_control control = {}; 1676 struct sk_buff *skb, *tmp; 1677 unsigned long flags; 1678 1679 skb_queue_walk_safe(skbs, skb, tmp) { 1680 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1681 int q = info->hw_queue; 1682 1683 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1684 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1685 __skb_unlink(skb, skbs); 1686 ieee80211_free_txskb(&local->hw, skb); 1687 continue; 1688 } 1689 #endif 1690 1691 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1692 if (local->queue_stop_reasons[q] || 1693 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1694 if (unlikely(info->flags & 1695 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1696 if (local->queue_stop_reasons[q] & 1697 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1698 /* 1699 * Drop off-channel frames if queues 1700 * are stopped for any reason other 1701 * than off-channel operation. Never 1702 * queue them. 1703 */ 1704 spin_unlock_irqrestore( 1705 &local->queue_stop_reason_lock, 1706 flags); 1707 ieee80211_purge_tx_queue(&local->hw, 1708 skbs); 1709 return true; 1710 } 1711 } else { 1712 1713 /* 1714 * Since queue is stopped, queue up frames for 1715 * later transmission from the tx-pending 1716 * tasklet when the queue is woken again. 1717 */ 1718 if (txpending) 1719 skb_queue_splice_init(skbs, 1720 &local->pending[q]); 1721 else 1722 skb_queue_splice_tail_init(skbs, 1723 &local->pending[q]); 1724 1725 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1726 flags); 1727 return false; 1728 } 1729 } 1730 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1731 1732 info->control.vif = vif; 1733 control.sta = sta ? &sta->sta : NULL; 1734 1735 __skb_unlink(skb, skbs); 1736 drv_tx(local, &control, skb); 1737 } 1738 1739 return true; 1740 } 1741 1742 /* 1743 * Returns false if the frame couldn't be transmitted but was queued instead. 1744 */ 1745 static bool __ieee80211_tx(struct ieee80211_local *local, 1746 struct sk_buff_head *skbs, struct sta_info *sta, 1747 bool txpending) 1748 { 1749 struct ieee80211_tx_info *info; 1750 struct ieee80211_sub_if_data *sdata; 1751 struct ieee80211_vif *vif; 1752 struct sk_buff *skb; 1753 bool result; 1754 1755 if (WARN_ON(skb_queue_empty(skbs))) 1756 return true; 1757 1758 skb = skb_peek(skbs); 1759 info = IEEE80211_SKB_CB(skb); 1760 sdata = vif_to_sdata(info->control.vif); 1761 if (sta && !sta->uploaded) 1762 sta = NULL; 1763 1764 switch (sdata->vif.type) { 1765 case NL80211_IFTYPE_MONITOR: 1766 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1767 vif = &sdata->vif; 1768 break; 1769 } 1770 sdata = rcu_dereference(local->monitor_sdata); 1771 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1772 vif = &sdata->vif; 1773 info->hw_queue = 1774 vif->hw_queue[skb_get_queue_mapping(skb)]; 1775 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1776 ieee80211_purge_tx_queue(&local->hw, skbs); 1777 return true; 1778 } else 1779 vif = NULL; 1780 break; 1781 case NL80211_IFTYPE_AP_VLAN: 1782 sdata = container_of(sdata->bss, 1783 struct ieee80211_sub_if_data, u.ap); 1784 fallthrough; 1785 default: 1786 vif = &sdata->vif; 1787 break; 1788 } 1789 1790 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1791 1792 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1793 1794 return result; 1795 } 1796 1797 /* 1798 * Invoke TX handlers, return 0 on success and non-zero if the 1799 * frame was dropped or queued. 1800 * 1801 * The handlers are split into an early and late part. The latter is everything 1802 * that can be sensitive to reordering, and will be deferred to after packets 1803 * are dequeued from the intermediate queues (when they are enabled). 1804 */ 1805 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1806 { 1807 ieee80211_tx_result res = TX_DROP; 1808 1809 #define CALL_TXH(txh) \ 1810 do { \ 1811 res = txh(tx); \ 1812 if (res != TX_CONTINUE) \ 1813 goto txh_done; \ 1814 } while (0) 1815 1816 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1817 CALL_TXH(ieee80211_tx_h_check_assoc); 1818 CALL_TXH(ieee80211_tx_h_ps_buf); 1819 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1820 CALL_TXH(ieee80211_tx_h_select_key); 1821 1822 txh_done: 1823 if (unlikely(res == TX_DROP)) { 1824 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1825 if (tx->skb) 1826 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1827 else 1828 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1829 return -1; 1830 } else if (unlikely(res == TX_QUEUED)) { 1831 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1832 return -1; 1833 } 1834 1835 return 0; 1836 } 1837 1838 /* 1839 * Late handlers can be called while the sta lock is held. Handlers that can 1840 * cause packets to be generated will cause deadlock! 1841 */ 1842 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1843 { 1844 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1845 ieee80211_tx_result res = TX_CONTINUE; 1846 1847 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1848 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1849 1850 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1851 __skb_queue_tail(&tx->skbs, tx->skb); 1852 tx->skb = NULL; 1853 goto txh_done; 1854 } 1855 1856 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1857 CALL_TXH(ieee80211_tx_h_sequence); 1858 CALL_TXH(ieee80211_tx_h_fragment); 1859 /* handlers after fragment must be aware of tx info fragmentation! */ 1860 CALL_TXH(ieee80211_tx_h_stats); 1861 CALL_TXH(ieee80211_tx_h_encrypt); 1862 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1863 CALL_TXH(ieee80211_tx_h_calculate_duration); 1864 #undef CALL_TXH 1865 1866 txh_done: 1867 if (unlikely(res == TX_DROP)) { 1868 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1869 if (tx->skb) 1870 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1871 else 1872 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1873 return -1; 1874 } else if (unlikely(res == TX_QUEUED)) { 1875 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1876 return -1; 1877 } 1878 1879 return 0; 1880 } 1881 1882 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1883 { 1884 int r = invoke_tx_handlers_early(tx); 1885 1886 if (r) 1887 return r; 1888 return invoke_tx_handlers_late(tx); 1889 } 1890 1891 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1892 struct ieee80211_vif *vif, struct sk_buff *skb, 1893 int band, struct ieee80211_sta **sta) 1894 { 1895 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1896 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1897 struct ieee80211_tx_data tx; 1898 struct sk_buff *skb2; 1899 1900 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1901 return false; 1902 1903 info->band = band; 1904 info->control.vif = vif; 1905 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1906 1907 if (invoke_tx_handlers(&tx)) 1908 return false; 1909 1910 if (sta) { 1911 if (tx.sta) 1912 *sta = &tx.sta->sta; 1913 else 1914 *sta = NULL; 1915 } 1916 1917 /* this function isn't suitable for fragmented data frames */ 1918 skb2 = __skb_dequeue(&tx.skbs); 1919 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1920 ieee80211_free_txskb(hw, skb2); 1921 ieee80211_purge_tx_queue(hw, &tx.skbs); 1922 return false; 1923 } 1924 1925 return true; 1926 } 1927 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1928 1929 /* 1930 * Returns false if the frame couldn't be transmitted but was queued instead. 1931 */ 1932 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1933 struct sta_info *sta, struct sk_buff *skb, 1934 bool txpending) 1935 { 1936 struct ieee80211_local *local = sdata->local; 1937 struct ieee80211_tx_data tx; 1938 ieee80211_tx_result res_prepare; 1939 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1940 bool result = true; 1941 1942 if (unlikely(skb->len < 10)) { 1943 dev_kfree_skb(skb); 1944 return true; 1945 } 1946 1947 /* initialises tx */ 1948 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1949 1950 if (unlikely(res_prepare == TX_DROP)) { 1951 ieee80211_free_txskb(&local->hw, skb); 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 ((skb->sk && 2878 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2879 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2880 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2881 cookie); 2882 2883 /* 2884 * If the skb is shared we need to obtain our own copy. 2885 */ 2886 skb = skb_share_check(skb, GFP_ATOMIC); 2887 if (unlikely(!skb)) { 2888 ret = -ENOMEM; 2889 goto free; 2890 } 2891 2892 hdr.frame_control = fc; 2893 hdr.duration_id = 0; 2894 hdr.seq_ctrl = 0; 2895 2896 skip_header_bytes = ETH_HLEN; 2897 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2898 encaps_data = bridge_tunnel_header; 2899 encaps_len = sizeof(bridge_tunnel_header); 2900 skip_header_bytes -= 2; 2901 } else if (ethertype >= ETH_P_802_3_MIN) { 2902 encaps_data = rfc1042_header; 2903 encaps_len = sizeof(rfc1042_header); 2904 skip_header_bytes -= 2; 2905 } else { 2906 encaps_data = NULL; 2907 encaps_len = 0; 2908 } 2909 2910 skb_pull(skb, skip_header_bytes); 2911 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2912 2913 /* 2914 * So we need to modify the skb header and hence need a copy of 2915 * that. The head_need variable above doesn't, so far, include 2916 * the needed header space that we don't need right away. If we 2917 * can, then we don't reallocate right now but only after the 2918 * frame arrives at the master device (if it does...) 2919 * 2920 * If we cannot, however, then we will reallocate to include all 2921 * the ever needed space. Also, if we need to reallocate it anyway, 2922 * make it big enough for everything we may ever need. 2923 */ 2924 2925 if (head_need > 0 || skb_cloned(skb)) { 2926 head_need += IEEE80211_ENCRYPT_HEADROOM; 2927 head_need += local->tx_headroom; 2928 head_need = max_t(int, 0, head_need); 2929 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2930 ieee80211_free_txskb(&local->hw, skb); 2931 skb = NULL; 2932 return ERR_PTR(-ENOMEM); 2933 } 2934 } 2935 2936 if (encaps_data) 2937 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2938 2939 #ifdef CONFIG_MAC80211_MESH 2940 if (meshhdrlen > 0) 2941 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2942 #endif 2943 2944 if (ieee80211_is_data_qos(fc)) { 2945 __le16 *qos_control; 2946 2947 qos_control = skb_push(skb, 2); 2948 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2949 /* 2950 * Maybe we could actually set some fields here, for now just 2951 * initialise to zero to indicate no special operation. 2952 */ 2953 *qos_control = 0; 2954 } else 2955 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2956 2957 skb_reset_mac_header(skb); 2958 2959 info = IEEE80211_SKB_CB(skb); 2960 memset(info, 0, sizeof(*info)); 2961 2962 info->flags = info_flags; 2963 if (info_id) { 2964 info->status_data = info_id; 2965 info->status_data_idr = 1; 2966 } 2967 info->band = band; 2968 2969 if (likely(!cookie)) { 2970 ctrl_flags |= u32_encode_bits(link_id, 2971 IEEE80211_TX_CTRL_MLO_LINK); 2972 } else { 2973 unsigned int pre_conf_link_id; 2974 2975 /* 2976 * ctrl_flags already have been set by 2977 * ieee80211_tx_control_port(), here 2978 * we just sanity check that 2979 */ 2980 2981 pre_conf_link_id = u32_get_bits(ctrl_flags, 2982 IEEE80211_TX_CTRL_MLO_LINK); 2983 2984 if (pre_conf_link_id != link_id && 2985 link_id != IEEE80211_LINK_UNSPECIFIED) { 2986 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2987 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2988 sdata->name, hdr.addr1, 2989 pre_conf_link_id, link_id); 2990 #endif 2991 ret = -EINVAL; 2992 goto free; 2993 } 2994 } 2995 2996 info->control.flags = ctrl_flags; 2997 2998 return skb; 2999 free: 3000 kfree_skb(skb); 3001 return ERR_PTR(ret); 3002 } 3003 3004 /* 3005 * fast-xmit overview 3006 * 3007 * The core idea of this fast-xmit is to remove per-packet checks by checking 3008 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3009 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3010 * much less work can be done per packet. For example, fragmentation must be 3011 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3012 * in the code here. 3013 * 3014 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3015 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3016 * 3017 * The most difficult part of this is that when any of these assumptions 3018 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3019 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3020 * since the per-packet code no longer checks the conditions. This is reflected 3021 * by the calls to these functions throughout the rest of the code, and must be 3022 * maintained if any of the TX path checks change. 3023 */ 3024 3025 void ieee80211_check_fast_xmit(struct sta_info *sta) 3026 { 3027 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3028 struct ieee80211_local *local = sta->local; 3029 struct ieee80211_sub_if_data *sdata = sta->sdata; 3030 struct ieee80211_hdr *hdr = (void *)build.hdr; 3031 struct ieee80211_chanctx_conf *chanctx_conf; 3032 __le16 fc; 3033 3034 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3035 return; 3036 3037 if (ieee80211_vif_is_mesh(&sdata->vif)) 3038 mesh_fast_tx_flush_sta(sdata, sta); 3039 3040 /* Locking here protects both the pointer itself, and against concurrent 3041 * invocations winning data access races to, e.g., the key pointer that 3042 * is used. 3043 * Without it, the invocation of this function right after the key 3044 * pointer changes wouldn't be sufficient, as another CPU could access 3045 * the pointer, then stall, and then do the cache update after the CPU 3046 * that invalidated the key. 3047 * With the locking, such scenarios cannot happen as the check for the 3048 * key and the fast-tx assignment are done atomically, so the CPU that 3049 * modifies the key will either wait or other one will see the key 3050 * cleared/changed already. 3051 */ 3052 spin_lock_bh(&sta->lock); 3053 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3054 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3055 sdata->vif.type == NL80211_IFTYPE_STATION) 3056 goto out; 3057 3058 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3059 goto out; 3060 3061 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3062 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3063 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3064 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3065 goto out; 3066 3067 if (sdata->noack_map) 3068 goto out; 3069 3070 /* fast-xmit doesn't handle fragmentation at all */ 3071 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3072 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3073 goto out; 3074 3075 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3076 rcu_read_lock(); 3077 chanctx_conf = 3078 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3079 if (!chanctx_conf) { 3080 rcu_read_unlock(); 3081 goto out; 3082 } 3083 build.band = chanctx_conf->def.chan->band; 3084 rcu_read_unlock(); 3085 } else { 3086 /* MLD transmissions must not rely on the band */ 3087 build.band = 0; 3088 } 3089 3090 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3091 3092 switch (sdata->vif.type) { 3093 case NL80211_IFTYPE_ADHOC: 3094 /* DA SA BSSID */ 3095 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3096 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3097 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3098 build.hdr_len = 24; 3099 break; 3100 case NL80211_IFTYPE_STATION: 3101 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3102 /* For TDLS only one link can be valid with peer STA */ 3103 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3104 struct ieee80211_link_data *link; 3105 3106 /* DA SA BSSID */ 3107 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3108 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3109 rcu_read_lock(); 3110 link = rcu_dereference(sdata->link[tdls_link_id]); 3111 if (!WARN_ON_ONCE(!link)) 3112 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3113 rcu_read_unlock(); 3114 build.hdr_len = 24; 3115 break; 3116 } 3117 3118 if (sdata->u.mgd.use_4addr) { 3119 /* non-regular ethertype cannot use the fastpath */ 3120 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3121 IEEE80211_FCTL_TODS); 3122 /* RA TA DA SA */ 3123 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3124 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3125 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3126 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3127 build.hdr_len = 30; 3128 break; 3129 } 3130 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3131 /* BSSID SA DA */ 3132 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3133 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3134 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3135 build.hdr_len = 24; 3136 break; 3137 case NL80211_IFTYPE_AP_VLAN: 3138 if (sdata->wdev.use_4addr) { 3139 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3140 IEEE80211_FCTL_TODS); 3141 /* RA TA DA SA */ 3142 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3143 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3144 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3145 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3146 build.hdr_len = 30; 3147 break; 3148 } 3149 fallthrough; 3150 case NL80211_IFTYPE_AP: 3151 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3152 /* DA BSSID SA */ 3153 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3154 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3155 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3156 } else { 3157 unsigned int link_id = sta->deflink.link_id; 3158 struct ieee80211_link_data *link; 3159 3160 rcu_read_lock(); 3161 link = rcu_dereference(sdata->link[link_id]); 3162 if (WARN_ON(!link)) { 3163 rcu_read_unlock(); 3164 goto out; 3165 } 3166 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3167 rcu_read_unlock(); 3168 } 3169 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3170 build.hdr_len = 24; 3171 break; 3172 default: 3173 /* not handled on fast-xmit */ 3174 goto out; 3175 } 3176 3177 if (sta->sta.wme) { 3178 build.hdr_len += 2; 3179 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3180 } 3181 3182 /* We store the key here so there's no point in using rcu_dereference() 3183 * but that's fine because the code that changes the pointers will call 3184 * this function after doing so. For a single CPU that would be enough, 3185 * for multiple see the comment above. 3186 */ 3187 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3188 if (!build.key) 3189 build.key = rcu_access_pointer(sdata->default_unicast_key); 3190 if (build.key) { 3191 bool gen_iv, iv_spc, mmic; 3192 3193 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3194 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3195 mmic = build.key->conf.flags & 3196 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3197 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3198 3199 /* don't handle software crypto */ 3200 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3201 goto out; 3202 3203 /* Key is being removed */ 3204 if (build.key->flags & KEY_FLAG_TAINTED) 3205 goto out; 3206 3207 switch (build.key->conf.cipher) { 3208 case WLAN_CIPHER_SUITE_CCMP: 3209 case WLAN_CIPHER_SUITE_CCMP_256: 3210 if (gen_iv) 3211 build.pn_offs = build.hdr_len; 3212 if (gen_iv || iv_spc) 3213 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3214 break; 3215 case WLAN_CIPHER_SUITE_GCMP: 3216 case WLAN_CIPHER_SUITE_GCMP_256: 3217 if (gen_iv) 3218 build.pn_offs = build.hdr_len; 3219 if (gen_iv || iv_spc) 3220 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3221 break; 3222 case WLAN_CIPHER_SUITE_TKIP: 3223 /* cannot handle MMIC or IV generation in xmit-fast */ 3224 if (mmic || gen_iv) 3225 goto out; 3226 if (iv_spc) 3227 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3228 break; 3229 case WLAN_CIPHER_SUITE_WEP40: 3230 case WLAN_CIPHER_SUITE_WEP104: 3231 /* cannot handle IV generation in fast-xmit */ 3232 if (gen_iv) 3233 goto out; 3234 if (iv_spc) 3235 build.hdr_len += IEEE80211_WEP_IV_LEN; 3236 break; 3237 case WLAN_CIPHER_SUITE_AES_CMAC: 3238 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3239 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3240 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3241 WARN(1, 3242 "management cipher suite 0x%x enabled for data\n", 3243 build.key->conf.cipher); 3244 goto out; 3245 default: 3246 /* we don't know how to generate IVs for this at all */ 3247 if (WARN_ON(gen_iv)) 3248 goto out; 3249 } 3250 3251 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3252 } 3253 3254 hdr->frame_control = fc; 3255 3256 memcpy(build.hdr + build.hdr_len, 3257 rfc1042_header, sizeof(rfc1042_header)); 3258 build.hdr_len += sizeof(rfc1042_header); 3259 3260 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3261 /* if the kmemdup fails, continue w/o fast_tx */ 3262 3263 out: 3264 /* we might have raced against another call to this function */ 3265 old = rcu_dereference_protected(sta->fast_tx, 3266 lockdep_is_held(&sta->lock)); 3267 rcu_assign_pointer(sta->fast_tx, fast_tx); 3268 if (old) 3269 kfree_rcu(old, rcu_head); 3270 spin_unlock_bh(&sta->lock); 3271 } 3272 3273 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3274 { 3275 struct sta_info *sta; 3276 3277 rcu_read_lock(); 3278 list_for_each_entry_rcu(sta, &local->sta_list, list) 3279 ieee80211_check_fast_xmit(sta); 3280 rcu_read_unlock(); 3281 } 3282 3283 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3284 { 3285 struct ieee80211_local *local = sdata->local; 3286 struct sta_info *sta; 3287 3288 rcu_read_lock(); 3289 3290 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3291 if (sdata != sta->sdata && 3292 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3293 continue; 3294 ieee80211_check_fast_xmit(sta); 3295 } 3296 3297 rcu_read_unlock(); 3298 } 3299 3300 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3301 { 3302 struct ieee80211_fast_tx *fast_tx; 3303 3304 spin_lock_bh(&sta->lock); 3305 fast_tx = rcu_dereference_protected(sta->fast_tx, 3306 lockdep_is_held(&sta->lock)); 3307 RCU_INIT_POINTER(sta->fast_tx, NULL); 3308 spin_unlock_bh(&sta->lock); 3309 3310 if (fast_tx) 3311 kfree_rcu(fast_tx, rcu_head); 3312 } 3313 3314 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3315 struct sk_buff *skb, int headroom) 3316 { 3317 if (skb_headroom(skb) < headroom) { 3318 I802_DEBUG_INC(local->tx_expand_skb_head); 3319 3320 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3321 wiphy_debug(local->hw.wiphy, 3322 "failed to reallocate TX buffer\n"); 3323 return false; 3324 } 3325 } 3326 3327 return true; 3328 } 3329 3330 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3331 struct ieee80211_fast_tx *fast_tx, 3332 struct sk_buff *skb) 3333 { 3334 struct ieee80211_local *local = sdata->local; 3335 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3336 struct ieee80211_hdr *hdr; 3337 struct ethhdr *amsdu_hdr; 3338 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3339 int subframe_len = skb->len - hdr_len; 3340 void *data; 3341 u8 *qc, *h_80211_src, *h_80211_dst; 3342 const u8 *bssid; 3343 3344 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3345 return false; 3346 3347 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3348 return true; 3349 3350 if (!ieee80211_amsdu_realloc_pad(local, skb, 3351 sizeof(*amsdu_hdr) + 3352 local->hw.extra_tx_headroom)) 3353 return false; 3354 3355 data = skb_push(skb, sizeof(*amsdu_hdr)); 3356 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3357 hdr = data; 3358 amsdu_hdr = data + hdr_len; 3359 /* h_80211_src/dst is addr* field within hdr */ 3360 h_80211_src = data + fast_tx->sa_offs; 3361 h_80211_dst = data + fast_tx->da_offs; 3362 3363 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3364 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3365 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3366 3367 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3368 * fields needs to be changed to BSSID for A-MSDU frames depending 3369 * on FromDS/ToDS values. 3370 */ 3371 switch (sdata->vif.type) { 3372 case NL80211_IFTYPE_STATION: 3373 bssid = sdata->vif.cfg.ap_addr; 3374 break; 3375 case NL80211_IFTYPE_AP: 3376 case NL80211_IFTYPE_AP_VLAN: 3377 bssid = sdata->vif.addr; 3378 break; 3379 default: 3380 bssid = NULL; 3381 } 3382 3383 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3384 ether_addr_copy(h_80211_src, bssid); 3385 3386 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3387 ether_addr_copy(h_80211_dst, bssid); 3388 3389 qc = ieee80211_get_qos_ctl(hdr); 3390 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3391 3392 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3393 3394 return true; 3395 } 3396 3397 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3398 struct sta_info *sta, 3399 struct ieee80211_fast_tx *fast_tx, 3400 struct sk_buff *skb, 3401 const u8 *da, const u8 *sa) 3402 { 3403 struct ieee80211_local *local = sdata->local; 3404 struct fq *fq = &local->fq; 3405 struct fq_tin *tin; 3406 struct fq_flow *flow; 3407 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3408 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3409 struct txq_info *txqi; 3410 struct sk_buff **frag_tail, *head; 3411 int subframe_len = skb->len - ETH_ALEN; 3412 u8 max_subframes = sta->sta.max_amsdu_subframes; 3413 int max_frags = local->hw.max_tx_fragments; 3414 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3415 int orig_truesize; 3416 u32 flow_idx; 3417 __be16 len; 3418 void *data; 3419 bool ret = false; 3420 unsigned int orig_len; 3421 int n = 2, nfrags, pad = 0; 3422 u16 hdrlen; 3423 3424 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3425 return false; 3426 3427 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3428 return false; 3429 3430 if (ieee80211_vif_is_mesh(&sdata->vif)) 3431 return false; 3432 3433 if (skb_is_gso(skb)) 3434 return false; 3435 3436 if (!txq) 3437 return false; 3438 3439 txqi = to_txq_info(txq); 3440 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3441 return false; 3442 3443 if (sta->sta.cur->max_rc_amsdu_len) 3444 max_amsdu_len = min_t(int, max_amsdu_len, 3445 sta->sta.cur->max_rc_amsdu_len); 3446 3447 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3448 max_amsdu_len = min_t(int, max_amsdu_len, 3449 sta->sta.cur->max_tid_amsdu_len[tid]); 3450 3451 flow_idx = fq_flow_idx(fq, skb); 3452 3453 spin_lock_bh(&fq->lock); 3454 3455 /* TODO: Ideally aggregation should be done on dequeue to remain 3456 * responsive to environment changes. 3457 */ 3458 3459 tin = &txqi->tin; 3460 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3461 head = skb_peek_tail(&flow->queue); 3462 if (!head || skb_is_gso(head)) 3463 goto out; 3464 3465 orig_truesize = head->truesize; 3466 orig_len = head->len; 3467 3468 if (skb->len + head->len > max_amsdu_len) 3469 goto out; 3470 3471 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3472 nfrags += 1 + skb_shinfo(head)->nr_frags; 3473 frag_tail = &skb_shinfo(head)->frag_list; 3474 while (*frag_tail) { 3475 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3476 frag_tail = &(*frag_tail)->next; 3477 n++; 3478 } 3479 3480 if (max_subframes && n > max_subframes) 3481 goto out; 3482 3483 if (max_frags && nfrags > max_frags) 3484 goto out; 3485 3486 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3487 goto out; 3488 3489 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3490 goto out; 3491 3492 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3493 * and frag_tail should be &skb_shinfo(head)->frag_list. 3494 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3495 * Reload frag_tail to have it pointing to the correct place. 3496 */ 3497 if (n == 2) 3498 frag_tail = &skb_shinfo(head)->frag_list; 3499 3500 /* 3501 * Pad out the previous subframe to a multiple of 4 by adding the 3502 * padding to the next one, that's being added. Note that head->len 3503 * is the length of the full A-MSDU, but that works since each time 3504 * we add a new subframe we pad out the previous one to a multiple 3505 * of 4 and thus it no longer matters in the next round. 3506 */ 3507 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3508 if ((head->len - hdrlen) & 3) 3509 pad = 4 - ((head->len - hdrlen) & 3); 3510 3511 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3512 2 + pad)) 3513 goto out_recalc; 3514 3515 ret = true; 3516 data = skb_push(skb, ETH_ALEN + 2); 3517 ether_addr_copy(data, da); 3518 ether_addr_copy(data + ETH_ALEN, sa); 3519 3520 data += 2 * ETH_ALEN; 3521 len = cpu_to_be16(subframe_len); 3522 memcpy(data, &len, 2); 3523 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3524 3525 memset(skb_push(skb, pad), 0, pad); 3526 3527 head->len += skb->len; 3528 head->data_len += skb->len; 3529 *frag_tail = skb; 3530 3531 out_recalc: 3532 fq->memory_usage += head->truesize - orig_truesize; 3533 if (head->len != orig_len) { 3534 flow->backlog += head->len - orig_len; 3535 tin->backlog_bytes += head->len - orig_len; 3536 } 3537 out: 3538 spin_unlock_bh(&fq->lock); 3539 3540 return ret; 3541 } 3542 3543 /* 3544 * Can be called while the sta lock is held. Anything that can cause packets to 3545 * be generated will cause deadlock! 3546 */ 3547 static ieee80211_tx_result 3548 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3549 struct sta_info *sta, u8 pn_offs, 3550 struct ieee80211_key *key, 3551 struct ieee80211_tx_data *tx) 3552 { 3553 struct sk_buff *skb = tx->skb; 3554 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3555 struct ieee80211_hdr *hdr = (void *)skb->data; 3556 u8 tid = IEEE80211_NUM_TIDS; 3557 3558 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3559 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3560 return TX_DROP; 3561 3562 if (key) 3563 info->control.hw_key = &key->conf; 3564 3565 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3566 3567 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3568 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3569 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3570 } else { 3571 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3572 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3573 sdata->sequence_number += 0x10; 3574 } 3575 3576 if (skb_shinfo(skb)->gso_size) 3577 sta->deflink.tx_stats.msdu[tid] += 3578 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3579 else 3580 sta->deflink.tx_stats.msdu[tid]++; 3581 3582 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3583 3584 /* statistics normally done by ieee80211_tx_h_stats (but that 3585 * has to consider fragmentation, so is more complex) 3586 */ 3587 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3588 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3589 3590 if (pn_offs) { 3591 u64 pn; 3592 u8 *crypto_hdr = skb->data + pn_offs; 3593 3594 switch (key->conf.cipher) { 3595 case WLAN_CIPHER_SUITE_CCMP: 3596 case WLAN_CIPHER_SUITE_CCMP_256: 3597 case WLAN_CIPHER_SUITE_GCMP: 3598 case WLAN_CIPHER_SUITE_GCMP_256: 3599 pn = atomic64_inc_return(&key->conf.tx_pn); 3600 crypto_hdr[0] = pn; 3601 crypto_hdr[1] = pn >> 8; 3602 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3603 crypto_hdr[4] = pn >> 16; 3604 crypto_hdr[5] = pn >> 24; 3605 crypto_hdr[6] = pn >> 32; 3606 crypto_hdr[7] = pn >> 40; 3607 break; 3608 } 3609 } 3610 3611 return TX_CONTINUE; 3612 } 3613 3614 static netdev_features_t 3615 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3616 { 3617 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3618 return sdata->vif.netdev_features; 3619 3620 if (!sdata->bss) 3621 return 0; 3622 3623 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3624 return sdata->vif.netdev_features; 3625 } 3626 3627 static struct sk_buff * 3628 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3629 { 3630 if (skb_is_gso(skb)) { 3631 struct sk_buff *segs; 3632 3633 segs = skb_gso_segment(skb, features); 3634 if (!segs) 3635 return skb; 3636 if (IS_ERR(segs)) 3637 goto free; 3638 3639 consume_skb(skb); 3640 return segs; 3641 } 3642 3643 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3644 goto free; 3645 3646 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3647 int ofs = skb_checksum_start_offset(skb); 3648 3649 if (skb->encapsulation) 3650 skb_set_inner_transport_header(skb, ofs); 3651 else 3652 skb_set_transport_header(skb, ofs); 3653 3654 if (skb_csum_hwoffload_help(skb, features)) 3655 goto free; 3656 } 3657 3658 skb_mark_not_on_list(skb); 3659 return skb; 3660 3661 free: 3662 kfree_skb(skb); 3663 return NULL; 3664 } 3665 3666 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3667 struct sta_info *sta, 3668 struct ieee80211_fast_tx *fast_tx, 3669 struct sk_buff *skb, bool ampdu, 3670 const u8 *da, const u8 *sa) 3671 { 3672 struct ieee80211_local *local = sdata->local; 3673 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3674 struct ieee80211_tx_info *info; 3675 struct ieee80211_tx_data tx; 3676 ieee80211_tx_result r; 3677 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3678 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3679 3680 skb = skb_share_check(skb, GFP_ATOMIC); 3681 if (unlikely(!skb)) 3682 return; 3683 3684 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3685 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3686 return; 3687 3688 /* will not be crypto-handled beyond what we do here, so use false 3689 * as the may-encrypt argument for the resize to not account for 3690 * more room than we already have in 'extra_head' 3691 */ 3692 if (unlikely(ieee80211_skb_resize(sdata, skb, 3693 max_t(int, extra_head + hw_headroom - 3694 skb_headroom(skb), 0), 3695 ENCRYPT_NO))) 3696 goto free; 3697 3698 hdr = skb_push(skb, extra_head); 3699 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3700 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3701 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3702 3703 info = IEEE80211_SKB_CB(skb); 3704 memset(info, 0, sizeof(*info)); 3705 info->band = fast_tx->band; 3706 info->control.vif = &sdata->vif; 3707 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3708 IEEE80211_TX_CTL_DONTFRAG; 3709 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3710 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3711 IEEE80211_TX_CTRL_MLO_LINK); 3712 3713 #ifdef CONFIG_MAC80211_DEBUGFS 3714 if (local->force_tx_status) 3715 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3716 #endif 3717 3718 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3719 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3720 3721 *ieee80211_get_qos_ctl(hdr) = tid; 3722 } 3723 3724 __skb_queue_head_init(&tx.skbs); 3725 3726 tx.flags = IEEE80211_TX_UNICAST; 3727 tx.local = local; 3728 tx.sdata = sdata; 3729 tx.sta = sta; 3730 tx.key = fast_tx->key; 3731 3732 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3733 return; 3734 3735 tx.skb = skb; 3736 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3737 fast_tx->key, &tx); 3738 tx.skb = NULL; 3739 if (r == TX_DROP) 3740 goto free; 3741 3742 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3743 sdata = container_of(sdata->bss, 3744 struct ieee80211_sub_if_data, u.ap); 3745 3746 __skb_queue_tail(&tx.skbs, skb); 3747 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3748 return; 3749 3750 free: 3751 kfree_skb(skb); 3752 } 3753 3754 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3755 struct sta_info *sta, 3756 struct ieee80211_fast_tx *fast_tx, 3757 struct sk_buff *skb) 3758 { 3759 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3760 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3761 struct tid_ampdu_tx *tid_tx = NULL; 3762 struct sk_buff *next; 3763 struct ethhdr eth; 3764 u8 tid = IEEE80211_NUM_TIDS; 3765 3766 /* control port protocol needs a lot of special handling */ 3767 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3768 return false; 3769 3770 /* only RFC 1042 SNAP */ 3771 if (ethertype < ETH_P_802_3_MIN) 3772 return false; 3773 3774 /* don't handle TX status request here either */ 3775 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3776 return false; 3777 3778 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3779 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3780 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3781 if (tid_tx) { 3782 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3783 return false; 3784 if (tid_tx->timeout) 3785 tid_tx->last_tx = jiffies; 3786 } 3787 } 3788 3789 memcpy(ð, skb->data, ETH_HLEN - 2); 3790 3791 /* after this point (skb is modified) we cannot return false */ 3792 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3793 if (!skb) 3794 return true; 3795 3796 skb_list_walk_safe(skb, skb, next) { 3797 skb_mark_not_on_list(skb); 3798 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3799 eth.h_dest, eth.h_source); 3800 } 3801 3802 return true; 3803 } 3804 3805 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3806 struct ieee80211_txq *txq) 3807 { 3808 struct ieee80211_local *local = hw_to_local(hw); 3809 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3810 struct ieee80211_hdr *hdr; 3811 struct sk_buff *skb = NULL; 3812 struct fq *fq = &local->fq; 3813 struct fq_tin *tin = &txqi->tin; 3814 struct ieee80211_tx_info *info; 3815 struct ieee80211_tx_data tx; 3816 ieee80211_tx_result r; 3817 struct ieee80211_vif *vif = txq->vif; 3818 int q = vif->hw_queue[txq->ac]; 3819 unsigned long flags; 3820 bool q_stopped; 3821 3822 WARN_ON_ONCE(softirq_count() == 0); 3823 3824 if (!ieee80211_txq_airtime_check(hw, txq)) 3825 return NULL; 3826 3827 begin: 3828 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3829 q_stopped = local->queue_stop_reasons[q]; 3830 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3831 3832 if (unlikely(q_stopped)) { 3833 /* mark for waking later */ 3834 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3835 return NULL; 3836 } 3837 3838 spin_lock_bh(&fq->lock); 3839 3840 /* Make sure fragments stay together. */ 3841 skb = __skb_dequeue(&txqi->frags); 3842 if (unlikely(skb)) { 3843 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3844 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3845 goto out; 3846 IEEE80211_SKB_CB(skb)->control.flags &= 3847 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3848 } else { 3849 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3850 goto out; 3851 3852 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3853 } 3854 3855 if (!skb) 3856 goto out; 3857 3858 spin_unlock_bh(&fq->lock); 3859 3860 hdr = (struct ieee80211_hdr *)skb->data; 3861 info = IEEE80211_SKB_CB(skb); 3862 3863 memset(&tx, 0, sizeof(tx)); 3864 __skb_queue_head_init(&tx.skbs); 3865 tx.local = local; 3866 tx.skb = skb; 3867 tx.sdata = vif_to_sdata(info->control.vif); 3868 3869 if (txq->sta) { 3870 tx.sta = container_of(txq->sta, struct sta_info, sta); 3871 /* 3872 * Drop unicast frames to unauthorised stations unless they are 3873 * injected frames or EAPOL frames from the local station. 3874 */ 3875 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3876 ieee80211_is_data(hdr->frame_control) && 3877 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3878 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3879 !is_multicast_ether_addr(hdr->addr1) && 3880 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3881 (!(info->control.flags & 3882 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3883 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3884 NULL)))) { 3885 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3886 ieee80211_free_txskb(&local->hw, skb); 3887 goto begin; 3888 } 3889 } 3890 3891 /* 3892 * The key can be removed while the packet was queued, so need to call 3893 * this here to get the current key. 3894 */ 3895 r = ieee80211_tx_h_select_key(&tx); 3896 if (r != TX_CONTINUE) { 3897 ieee80211_free_txskb(&local->hw, skb); 3898 goto begin; 3899 } 3900 3901 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3902 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3903 IEEE80211_TX_CTL_DONTFRAG); 3904 3905 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3906 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3907 r = ieee80211_tx_h_rate_ctrl(&tx); 3908 if (r != TX_CONTINUE) { 3909 ieee80211_free_txskb(&local->hw, skb); 3910 goto begin; 3911 } 3912 } 3913 goto encap_out; 3914 } 3915 3916 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3917 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3918 sta); 3919 u8 pn_offs = 0; 3920 3921 if (tx.key && 3922 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3923 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3924 3925 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3926 tx.key, &tx); 3927 if (r != TX_CONTINUE) { 3928 ieee80211_free_txskb(&local->hw, skb); 3929 goto begin; 3930 } 3931 } else { 3932 if (invoke_tx_handlers_late(&tx)) 3933 goto begin; 3934 3935 skb = __skb_dequeue(&tx.skbs); 3936 info = IEEE80211_SKB_CB(skb); 3937 3938 if (!skb_queue_empty(&tx.skbs)) { 3939 spin_lock_bh(&fq->lock); 3940 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3941 spin_unlock_bh(&fq->lock); 3942 } 3943 } 3944 3945 if (skb_has_frag_list(skb) && 3946 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3947 if (skb_linearize(skb)) { 3948 ieee80211_free_txskb(&local->hw, skb); 3949 goto begin; 3950 } 3951 } 3952 3953 switch (tx.sdata->vif.type) { 3954 case NL80211_IFTYPE_MONITOR: 3955 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3956 vif = &tx.sdata->vif; 3957 break; 3958 } 3959 tx.sdata = rcu_dereference(local->monitor_sdata); 3960 if (tx.sdata && 3961 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 3962 vif = &tx.sdata->vif; 3963 info->hw_queue = 3964 vif->hw_queue[skb_get_queue_mapping(skb)]; 3965 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3966 ieee80211_free_txskb(&local->hw, skb); 3967 goto begin; 3968 } else { 3969 info->control.vif = NULL; 3970 return skb; 3971 } 3972 break; 3973 case NL80211_IFTYPE_AP_VLAN: 3974 tx.sdata = container_of(tx.sdata->bss, 3975 struct ieee80211_sub_if_data, u.ap); 3976 fallthrough; 3977 default: 3978 vif = &tx.sdata->vif; 3979 break; 3980 } 3981 3982 encap_out: 3983 info->control.vif = vif; 3984 3985 if (tx.sta && 3986 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3987 bool ampdu = txq->ac != IEEE80211_AC_VO; 3988 u32 airtime; 3989 3990 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3991 skb->len, ampdu); 3992 if (airtime) { 3993 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3994 ieee80211_sta_update_pending_airtime(local, tx.sta, 3995 txq->ac, 3996 airtime, 3997 false); 3998 } 3999 } 4000 4001 return skb; 4002 4003 out: 4004 spin_unlock_bh(&fq->lock); 4005 4006 return skb; 4007 } 4008 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4009 4010 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4011 { 4012 struct airtime_info *air_info = &sta->airtime[ac]; 4013 4014 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4015 } 4016 4017 static void 4018 ieee80211_txq_set_active(struct txq_info *txqi) 4019 { 4020 struct sta_info *sta; 4021 4022 if (!txqi->txq.sta) 4023 return; 4024 4025 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4026 sta->airtime[txqi->txq.ac].last_active = jiffies; 4027 } 4028 4029 static bool 4030 ieee80211_txq_keep_active(struct txq_info *txqi) 4031 { 4032 struct sta_info *sta; 4033 4034 if (!txqi->txq.sta) 4035 return false; 4036 4037 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4038 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4039 return false; 4040 4041 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4042 } 4043 4044 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4045 { 4046 struct ieee80211_local *local = hw_to_local(hw); 4047 struct ieee80211_txq *ret = NULL; 4048 struct txq_info *txqi = NULL, *head = NULL; 4049 bool found_eligible_txq = false; 4050 4051 spin_lock_bh(&local->active_txq_lock[ac]); 4052 4053 if (!local->schedule_round[ac]) 4054 goto out; 4055 4056 begin: 4057 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4058 struct txq_info, 4059 schedule_order); 4060 if (!txqi) 4061 goto out; 4062 4063 if (txqi == head) { 4064 if (!found_eligible_txq) 4065 goto out; 4066 else 4067 found_eligible_txq = false; 4068 } 4069 4070 if (!head) 4071 head = txqi; 4072 4073 if (txqi->txq.sta) { 4074 struct sta_info *sta = container_of(txqi->txq.sta, 4075 struct sta_info, sta); 4076 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4077 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4078 4079 if (aql_check) 4080 found_eligible_txq = true; 4081 4082 if (deficit < 0) 4083 sta->airtime[txqi->txq.ac].deficit += 4084 sta->airtime_weight; 4085 4086 if (deficit < 0 || !aql_check) { 4087 list_move_tail(&txqi->schedule_order, 4088 &local->active_txqs[txqi->txq.ac]); 4089 goto begin; 4090 } 4091 } 4092 4093 if (txqi->schedule_round == local->schedule_round[ac]) 4094 goto out; 4095 4096 list_del_init(&txqi->schedule_order); 4097 txqi->schedule_round = local->schedule_round[ac]; 4098 ret = &txqi->txq; 4099 4100 out: 4101 spin_unlock_bh(&local->active_txq_lock[ac]); 4102 return ret; 4103 } 4104 EXPORT_SYMBOL(ieee80211_next_txq); 4105 4106 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4107 struct ieee80211_txq *txq, 4108 bool force) 4109 { 4110 struct ieee80211_local *local = hw_to_local(hw); 4111 struct txq_info *txqi = to_txq_info(txq); 4112 bool has_queue; 4113 4114 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4115 4116 has_queue = force || txq_has_queue(txq); 4117 if (list_empty(&txqi->schedule_order) && 4118 (has_queue || ieee80211_txq_keep_active(txqi))) { 4119 /* If airtime accounting is active, always enqueue STAs at the 4120 * head of the list to ensure that they only get moved to the 4121 * back by the airtime DRR scheduler once they have a negative 4122 * deficit. A station that already has a negative deficit will 4123 * get immediately moved to the back of the list on the next 4124 * call to ieee80211_next_txq(). 4125 */ 4126 if (txqi->txq.sta && local->airtime_flags && has_queue && 4127 wiphy_ext_feature_isset(local->hw.wiphy, 4128 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4129 list_add(&txqi->schedule_order, 4130 &local->active_txqs[txq->ac]); 4131 else 4132 list_add_tail(&txqi->schedule_order, 4133 &local->active_txqs[txq->ac]); 4134 if (has_queue) 4135 ieee80211_txq_set_active(txqi); 4136 } 4137 4138 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4139 } 4140 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4141 4142 DEFINE_STATIC_KEY_FALSE(aql_disable); 4143 4144 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4145 struct ieee80211_txq *txq) 4146 { 4147 struct sta_info *sta; 4148 struct ieee80211_local *local = hw_to_local(hw); 4149 4150 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4151 return true; 4152 4153 if (static_branch_unlikely(&aql_disable)) 4154 return true; 4155 4156 if (!txq->sta) 4157 return true; 4158 4159 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4160 return true; 4161 4162 sta = container_of(txq->sta, struct sta_info, sta); 4163 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4164 sta->airtime[txq->ac].aql_limit_low) 4165 return true; 4166 4167 if (atomic_read(&local->aql_total_pending_airtime) < 4168 local->aql_threshold && 4169 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4170 sta->airtime[txq->ac].aql_limit_high) 4171 return true; 4172 4173 return false; 4174 } 4175 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4176 4177 static bool 4178 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4179 { 4180 unsigned int num_txq = 0; 4181 struct txq_info *txq; 4182 u32 aql_limit; 4183 4184 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4185 return true; 4186 4187 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4188 num_txq++; 4189 4190 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4191 local->aql_txq_limit_high[ac]; 4192 4193 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4194 } 4195 4196 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4197 struct ieee80211_txq *txq) 4198 { 4199 struct ieee80211_local *local = hw_to_local(hw); 4200 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4201 struct sta_info *sta; 4202 u8 ac = txq->ac; 4203 4204 spin_lock_bh(&local->active_txq_lock[ac]); 4205 4206 if (!txqi->txq.sta) 4207 goto out; 4208 4209 if (list_empty(&txqi->schedule_order)) 4210 goto out; 4211 4212 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4213 goto out; 4214 4215 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4216 schedule_order) { 4217 if (iter == txqi) 4218 break; 4219 4220 if (!iter->txq.sta) { 4221 list_move_tail(&iter->schedule_order, 4222 &local->active_txqs[ac]); 4223 continue; 4224 } 4225 sta = container_of(iter->txq.sta, struct sta_info, sta); 4226 if (ieee80211_sta_deficit(sta, ac) < 0) 4227 sta->airtime[ac].deficit += sta->airtime_weight; 4228 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4229 } 4230 4231 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4232 if (sta->airtime[ac].deficit >= 0) 4233 goto out; 4234 4235 sta->airtime[ac].deficit += sta->airtime_weight; 4236 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4237 spin_unlock_bh(&local->active_txq_lock[ac]); 4238 4239 return false; 4240 out: 4241 if (!list_empty(&txqi->schedule_order)) 4242 list_del_init(&txqi->schedule_order); 4243 spin_unlock_bh(&local->active_txq_lock[ac]); 4244 4245 return true; 4246 } 4247 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4248 4249 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4250 { 4251 struct ieee80211_local *local = hw_to_local(hw); 4252 4253 spin_lock_bh(&local->active_txq_lock[ac]); 4254 4255 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4256 local->schedule_round[ac]++; 4257 if (!local->schedule_round[ac]) 4258 local->schedule_round[ac]++; 4259 } else { 4260 local->schedule_round[ac] = 0; 4261 } 4262 4263 spin_unlock_bh(&local->active_txq_lock[ac]); 4264 } 4265 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4266 4267 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4268 struct net_device *dev, 4269 u32 info_flags, 4270 u32 ctrl_flags, 4271 u64 *cookie) 4272 { 4273 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4274 struct ieee80211_local *local = sdata->local; 4275 struct sta_info *sta; 4276 struct sk_buff *next; 4277 int len = skb->len; 4278 4279 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4280 kfree_skb(skb); 4281 return; 4282 } 4283 4284 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4285 4286 rcu_read_lock(); 4287 4288 if (ieee80211_vif_is_mesh(&sdata->vif) && 4289 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4290 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4291 goto out; 4292 4293 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4294 goto out_free; 4295 4296 if (IS_ERR(sta)) 4297 sta = NULL; 4298 4299 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4300 ieee80211_aggr_check(sdata, sta, skb); 4301 4302 if (sta) { 4303 struct ieee80211_fast_tx *fast_tx; 4304 4305 fast_tx = rcu_dereference(sta->fast_tx); 4306 4307 if (fast_tx && 4308 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4309 goto out; 4310 } 4311 4312 /* the frame could be fragmented, software-encrypted, and other 4313 * things so we cannot really handle checksum or GSO offload. 4314 * fix it up in software before we handle anything else. 4315 */ 4316 skb = ieee80211_tx_skb_fixup(skb, 0); 4317 if (!skb) { 4318 len = 0; 4319 goto out; 4320 } 4321 4322 skb_list_walk_safe(skb, skb, next) { 4323 skb_mark_not_on_list(skb); 4324 4325 if (skb->protocol == sdata->control_port_protocol) 4326 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4327 4328 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4329 sta, ctrl_flags, cookie); 4330 if (IS_ERR(skb)) { 4331 kfree_skb_list(next); 4332 goto out; 4333 } 4334 4335 dev_sw_netstats_tx_add(dev, 1, skb->len); 4336 4337 ieee80211_xmit(sdata, sta, skb); 4338 } 4339 goto out; 4340 out_free: 4341 kfree_skb(skb); 4342 len = 0; 4343 out: 4344 if (len) 4345 ieee80211_tpt_led_trig_tx(local, len); 4346 rcu_read_unlock(); 4347 } 4348 4349 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4350 { 4351 struct ethhdr *eth; 4352 int err; 4353 4354 err = skb_ensure_writable(skb, ETH_HLEN); 4355 if (unlikely(err)) 4356 return err; 4357 4358 eth = (void *)skb->data; 4359 ether_addr_copy(eth->h_dest, sta->sta.addr); 4360 4361 return 0; 4362 } 4363 4364 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4365 struct net_device *dev) 4366 { 4367 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4368 const struct ethhdr *eth = (void *)skb->data; 4369 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4370 __be16 ethertype; 4371 4372 switch (sdata->vif.type) { 4373 case NL80211_IFTYPE_AP_VLAN: 4374 if (sdata->u.vlan.sta) 4375 return false; 4376 if (sdata->wdev.use_4addr) 4377 return false; 4378 fallthrough; 4379 case NL80211_IFTYPE_AP: 4380 /* check runtime toggle for this bss */ 4381 if (!sdata->bss->multicast_to_unicast) 4382 return false; 4383 break; 4384 default: 4385 return false; 4386 } 4387 4388 /* multicast to unicast conversion only for some payload */ 4389 ethertype = eth->h_proto; 4390 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4391 ethertype = ethvlan->h_vlan_encapsulated_proto; 4392 switch (ethertype) { 4393 case htons(ETH_P_ARP): 4394 case htons(ETH_P_IP): 4395 case htons(ETH_P_IPV6): 4396 break; 4397 default: 4398 return false; 4399 } 4400 4401 return true; 4402 } 4403 4404 static void 4405 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4406 struct sk_buff_head *queue) 4407 { 4408 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4409 struct ieee80211_local *local = sdata->local; 4410 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4411 struct sta_info *sta, *first = NULL; 4412 struct sk_buff *cloned_skb; 4413 4414 rcu_read_lock(); 4415 4416 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4417 if (sdata != sta->sdata) 4418 /* AP-VLAN mismatch */ 4419 continue; 4420 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4421 /* do not send back to source */ 4422 continue; 4423 if (!first) { 4424 first = sta; 4425 continue; 4426 } 4427 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4428 if (!cloned_skb) 4429 goto multicast; 4430 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4431 dev_kfree_skb(cloned_skb); 4432 goto multicast; 4433 } 4434 __skb_queue_tail(queue, cloned_skb); 4435 } 4436 4437 if (likely(first)) { 4438 if (unlikely(ieee80211_change_da(skb, first))) 4439 goto multicast; 4440 __skb_queue_tail(queue, skb); 4441 } else { 4442 /* no STA connected, drop */ 4443 kfree_skb(skb); 4444 skb = NULL; 4445 } 4446 4447 goto out; 4448 multicast: 4449 __skb_queue_purge(queue); 4450 __skb_queue_tail(queue, skb); 4451 out: 4452 rcu_read_unlock(); 4453 } 4454 4455 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4456 struct sk_buff *skb, u32 ctrl_flags, 4457 unsigned int link_id) 4458 { 4459 struct sk_buff *out; 4460 4461 out = skb_copy(skb, GFP_ATOMIC); 4462 if (!out) 4463 return; 4464 4465 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4466 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4467 } 4468 4469 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4470 struct sk_buff *skb) 4471 { 4472 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4473 unsigned long links = sdata->vif.active_links; 4474 unsigned int link; 4475 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4476 4477 if (hweight16(links) == 1) { 4478 ctrl_flags |= u32_encode_bits(__ffs(links), 4479 IEEE80211_TX_CTRL_MLO_LINK); 4480 4481 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4482 NULL); 4483 return; 4484 } 4485 4486 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4487 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4488 ctrl_flags = 0; 4489 } 4490 kfree_skb(skb); 4491 } 4492 4493 /** 4494 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4495 * @skb: packet to be sent 4496 * @dev: incoming interface 4497 * 4498 * On failure skb will be freed. 4499 * 4500 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4501 */ 4502 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4503 struct net_device *dev) 4504 { 4505 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4506 const struct ethhdr *eth = (void *)skb->data; 4507 4508 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4509 goto normal; 4510 4511 if (unlikely(!ieee80211_sdata_running(sdata))) { 4512 kfree_skb(skb); 4513 return NETDEV_TX_OK; 4514 } 4515 4516 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4517 struct sk_buff_head queue; 4518 4519 __skb_queue_head_init(&queue); 4520 ieee80211_convert_to_unicast(skb, dev, &queue); 4521 while ((skb = __skb_dequeue(&queue))) 4522 __ieee80211_subif_start_xmit(skb, dev, 0, 4523 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4524 NULL); 4525 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4526 sdata->vif.type == NL80211_IFTYPE_AP && 4527 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4528 ieee80211_mlo_multicast_tx(dev, skb); 4529 } else { 4530 normal: 4531 __ieee80211_subif_start_xmit(skb, dev, 0, 4532 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4533 NULL); 4534 } 4535 4536 return NETDEV_TX_OK; 4537 } 4538 4539 4540 4541 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4542 struct sk_buff *skb, struct sta_info *sta, 4543 bool txpending) 4544 { 4545 struct ieee80211_local *local = sdata->local; 4546 struct ieee80211_tx_control control = {}; 4547 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4548 struct ieee80211_sta *pubsta = NULL; 4549 unsigned long flags; 4550 int q = info->hw_queue; 4551 4552 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4553 4554 if (local->queue_stop_reasons[q] || 4555 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4556 if (txpending) 4557 skb_queue_head(&local->pending[q], skb); 4558 else 4559 skb_queue_tail(&local->pending[q], skb); 4560 4561 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4562 4563 return false; 4564 } 4565 4566 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4567 4568 if (sta && sta->uploaded) 4569 pubsta = &sta->sta; 4570 4571 control.sta = pubsta; 4572 4573 drv_tx(local, &control, skb); 4574 4575 return true; 4576 } 4577 4578 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4579 struct sk_buff *skb, struct sta_info *sta, 4580 bool txpending) 4581 { 4582 struct ieee80211_local *local = sdata->local; 4583 struct sk_buff *next; 4584 bool ret = true; 4585 4586 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4587 return true; 4588 4589 skb_list_walk_safe(skb, skb, next) { 4590 skb_mark_not_on_list(skb); 4591 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4592 ret = false; 4593 } 4594 4595 return ret; 4596 } 4597 4598 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4599 struct net_device *dev, struct sta_info *sta, 4600 struct ieee80211_key *key, struct sk_buff *skb) 4601 { 4602 struct ieee80211_tx_info *info; 4603 struct ieee80211_local *local = sdata->local; 4604 struct tid_ampdu_tx *tid_tx; 4605 struct sk_buff *seg, *next; 4606 unsigned int skbs = 0, len = 0; 4607 u16 queue; 4608 u8 tid; 4609 4610 queue = ieee80211_select_queue(sdata, sta, skb); 4611 skb_set_queue_mapping(skb, queue); 4612 4613 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4614 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4615 goto out_free; 4616 4617 skb = skb_share_check(skb, GFP_ATOMIC); 4618 if (unlikely(!skb)) 4619 return; 4620 4621 ieee80211_aggr_check(sdata, sta, skb); 4622 4623 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4624 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4625 if (tid_tx) { 4626 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4627 /* fall back to non-offload slow path */ 4628 __ieee80211_subif_start_xmit(skb, dev, 0, 4629 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4630 NULL); 4631 return; 4632 } 4633 4634 if (tid_tx->timeout) 4635 tid_tx->last_tx = jiffies; 4636 } 4637 4638 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4639 if (!skb) 4640 return; 4641 4642 info = IEEE80211_SKB_CB(skb); 4643 memset(info, 0, sizeof(*info)); 4644 4645 info->hw_queue = sdata->vif.hw_queue[queue]; 4646 4647 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4648 sdata = container_of(sdata->bss, 4649 struct ieee80211_sub_if_data, u.ap); 4650 4651 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4652 info->control.vif = &sdata->vif; 4653 4654 if (key) 4655 info->control.hw_key = &key->conf; 4656 4657 skb_list_walk_safe(skb, seg, next) { 4658 skbs++; 4659 len += seg->len; 4660 if (seg != skb) 4661 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4662 } 4663 4664 if (unlikely(skb->sk && 4665 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 4666 info->status_data = ieee80211_store_ack_skb(local, skb, 4667 &info->flags, NULL); 4668 if (info->status_data) 4669 info->status_data_idr = 1; 4670 } 4671 4672 dev_sw_netstats_tx_add(dev, skbs, len); 4673 sta->deflink.tx_stats.packets[queue] += skbs; 4674 sta->deflink.tx_stats.bytes[queue] += len; 4675 4676 ieee80211_tpt_led_trig_tx(local, len); 4677 4678 ieee80211_tx_8023(sdata, skb, sta, false); 4679 4680 return; 4681 4682 out_free: 4683 kfree_skb(skb); 4684 } 4685 4686 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4687 struct net_device *dev) 4688 { 4689 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4690 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4691 struct ieee80211_key *key; 4692 struct sta_info *sta; 4693 4694 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4695 kfree_skb(skb); 4696 return NETDEV_TX_OK; 4697 } 4698 4699 rcu_read_lock(); 4700 4701 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4702 kfree_skb(skb); 4703 goto out; 4704 } 4705 4706 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4707 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4708 sdata->control_port_protocol == ehdr->h_proto)) 4709 goto skip_offload; 4710 4711 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4712 if (!key) 4713 key = rcu_dereference(sdata->default_unicast_key); 4714 4715 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4716 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4717 goto skip_offload; 4718 4719 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4720 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4721 goto out; 4722 4723 skip_offload: 4724 ieee80211_subif_start_xmit(skb, dev); 4725 out: 4726 rcu_read_unlock(); 4727 4728 return NETDEV_TX_OK; 4729 } 4730 4731 struct sk_buff * 4732 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4733 struct sk_buff *skb, u32 info_flags) 4734 { 4735 struct ieee80211_hdr *hdr; 4736 struct ieee80211_tx_data tx = { 4737 .local = sdata->local, 4738 .sdata = sdata, 4739 }; 4740 struct sta_info *sta; 4741 4742 rcu_read_lock(); 4743 4744 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4745 kfree_skb(skb); 4746 skb = ERR_PTR(-EINVAL); 4747 goto out; 4748 } 4749 4750 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4751 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4752 if (IS_ERR(skb)) 4753 goto out; 4754 4755 hdr = (void *)skb->data; 4756 tx.sta = sta_info_get(sdata, hdr->addr1); 4757 tx.skb = skb; 4758 4759 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4760 rcu_read_unlock(); 4761 kfree_skb(skb); 4762 return ERR_PTR(-EINVAL); 4763 } 4764 4765 out: 4766 rcu_read_unlock(); 4767 return skb; 4768 } 4769 4770 /* 4771 * ieee80211_clear_tx_pending may not be called in a context where 4772 * it is possible that it packets could come in again. 4773 */ 4774 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4775 { 4776 struct sk_buff *skb; 4777 int i; 4778 4779 for (i = 0; i < local->hw.queues; i++) { 4780 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4781 ieee80211_free_txskb(&local->hw, skb); 4782 } 4783 } 4784 4785 /* 4786 * Returns false if the frame couldn't be transmitted but was queued instead, 4787 * which in this case means re-queued -- take as an indication to stop sending 4788 * more pending frames. 4789 */ 4790 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4791 struct sk_buff *skb) 4792 { 4793 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4794 struct ieee80211_sub_if_data *sdata; 4795 struct sta_info *sta; 4796 struct ieee80211_hdr *hdr; 4797 bool result; 4798 struct ieee80211_chanctx_conf *chanctx_conf; 4799 4800 sdata = vif_to_sdata(info->control.vif); 4801 4802 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4803 /* update band only for non-MLD */ 4804 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4805 chanctx_conf = 4806 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4807 if (unlikely(!chanctx_conf)) { 4808 dev_kfree_skb(skb); 4809 return true; 4810 } 4811 info->band = chanctx_conf->def.chan->band; 4812 } 4813 result = ieee80211_tx(sdata, NULL, skb, true); 4814 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4815 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4816 dev_kfree_skb(skb); 4817 return true; 4818 } 4819 4820 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4821 sta = NULL; 4822 4823 result = ieee80211_tx_8023(sdata, skb, sta, true); 4824 } else { 4825 struct sk_buff_head skbs; 4826 4827 __skb_queue_head_init(&skbs); 4828 __skb_queue_tail(&skbs, skb); 4829 4830 hdr = (struct ieee80211_hdr *)skb->data; 4831 sta = sta_info_get(sdata, hdr->addr1); 4832 4833 result = __ieee80211_tx(local, &skbs, sta, true); 4834 } 4835 4836 return result; 4837 } 4838 4839 /* 4840 * Transmit all pending packets. Called from tasklet. 4841 */ 4842 void ieee80211_tx_pending(struct tasklet_struct *t) 4843 { 4844 struct ieee80211_local *local = from_tasklet(local, t, 4845 tx_pending_tasklet); 4846 unsigned long flags; 4847 int i; 4848 bool txok; 4849 4850 rcu_read_lock(); 4851 4852 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4853 for (i = 0; i < local->hw.queues; i++) { 4854 /* 4855 * If queue is stopped by something other than due to pending 4856 * frames, or we have no pending frames, proceed to next queue. 4857 */ 4858 if (local->queue_stop_reasons[i] || 4859 skb_queue_empty(&local->pending[i])) 4860 continue; 4861 4862 while (!skb_queue_empty(&local->pending[i])) { 4863 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4864 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4865 4866 if (WARN_ON(!info->control.vif)) { 4867 ieee80211_free_txskb(&local->hw, skb); 4868 continue; 4869 } 4870 4871 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4872 flags); 4873 4874 txok = ieee80211_tx_pending_skb(local, skb); 4875 spin_lock_irqsave(&local->queue_stop_reason_lock, 4876 flags); 4877 if (!txok) 4878 break; 4879 } 4880 } 4881 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4882 4883 rcu_read_unlock(); 4884 } 4885 4886 /* functions for drivers to get certain frames */ 4887 4888 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4889 struct ieee80211_link_data *link, 4890 struct ps_data *ps, struct sk_buff *skb, 4891 bool is_template) 4892 { 4893 u8 *pos, *tim; 4894 int aid0 = 0; 4895 int i, have_bits = 0, n1, n2; 4896 struct ieee80211_bss_conf *link_conf = link->conf; 4897 4898 /* Generate bitmap for TIM only if there are any STAs in power save 4899 * mode. */ 4900 if (atomic_read(&ps->num_sta_ps) > 0) 4901 /* in the hope that this is faster than 4902 * checking byte-for-byte */ 4903 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4904 IEEE80211_MAX_AID+1); 4905 if (!is_template) { 4906 if (ps->dtim_count == 0) 4907 ps->dtim_count = link_conf->dtim_period - 1; 4908 else 4909 ps->dtim_count--; 4910 } 4911 4912 tim = pos = skb_put(skb, 5); 4913 *pos++ = WLAN_EID_TIM; 4914 *pos++ = 3; 4915 *pos++ = ps->dtim_count; 4916 *pos++ = link_conf->dtim_period; 4917 4918 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4919 aid0 = 1; 4920 4921 ps->dtim_bc_mc = aid0 == 1; 4922 4923 if (have_bits) { 4924 /* Find largest even number N1 so that bits numbered 1 through 4925 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4926 * (N2 + 1) x 8 through 2007 are 0. */ 4927 n1 = 0; 4928 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4929 if (ps->tim[i]) { 4930 n1 = i & 0xfe; 4931 break; 4932 } 4933 } 4934 n2 = n1; 4935 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4936 if (ps->tim[i]) { 4937 n2 = i; 4938 break; 4939 } 4940 } 4941 4942 /* Bitmap control */ 4943 *pos++ = n1 | aid0; 4944 /* Part Virt Bitmap */ 4945 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4946 4947 tim[1] = n2 - n1 + 4; 4948 } else { 4949 *pos++ = aid0; /* Bitmap control */ 4950 4951 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4952 tim[1] = 4; 4953 /* Part Virt Bitmap */ 4954 skb_put_u8(skb, 0); 4955 } 4956 } 4957 } 4958 4959 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4960 struct ieee80211_link_data *link, 4961 struct ps_data *ps, struct sk_buff *skb, 4962 bool is_template) 4963 { 4964 struct ieee80211_local *local = sdata->local; 4965 4966 /* 4967 * Not very nice, but we want to allow the driver to call 4968 * ieee80211_beacon_get() as a response to the set_tim() 4969 * callback. That, however, is already invoked under the 4970 * sta_lock to guarantee consistent and race-free update 4971 * of the tim bitmap in mac80211 and the driver. 4972 */ 4973 if (local->tim_in_locked_section) { 4974 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4975 } else { 4976 spin_lock_bh(&local->tim_lock); 4977 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4978 spin_unlock_bh(&local->tim_lock); 4979 } 4980 4981 return 0; 4982 } 4983 4984 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4985 struct beacon_data *beacon, 4986 struct ieee80211_link_data *link) 4987 { 4988 u8 *beacon_data, count, max_count = 1; 4989 struct probe_resp *resp; 4990 size_t beacon_data_len; 4991 u16 *bcn_offsets; 4992 int i; 4993 4994 switch (sdata->vif.type) { 4995 case NL80211_IFTYPE_AP: 4996 beacon_data = beacon->tail; 4997 beacon_data_len = beacon->tail_len; 4998 break; 4999 case NL80211_IFTYPE_ADHOC: 5000 beacon_data = beacon->head; 5001 beacon_data_len = beacon->head_len; 5002 break; 5003 case NL80211_IFTYPE_MESH_POINT: 5004 beacon_data = beacon->head; 5005 beacon_data_len = beacon->head_len; 5006 break; 5007 default: 5008 return; 5009 } 5010 5011 resp = rcu_dereference(link->u.ap.probe_resp); 5012 5013 bcn_offsets = beacon->cntdwn_counter_offsets; 5014 count = beacon->cntdwn_current_counter; 5015 if (link->conf->csa_active) 5016 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5017 5018 for (i = 0; i < max_count; ++i) { 5019 if (bcn_offsets[i]) { 5020 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5021 return; 5022 beacon_data[bcn_offsets[i]] = count; 5023 } 5024 5025 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5026 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5027 5028 resp->data[resp_offsets[i]] = count; 5029 } 5030 } 5031 } 5032 5033 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 5034 { 5035 beacon->cntdwn_current_counter--; 5036 5037 /* the counter should never reach 0 */ 5038 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 5039 5040 return beacon->cntdwn_current_counter; 5041 } 5042 5043 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5044 { 5045 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5046 struct ieee80211_link_data *link; 5047 struct beacon_data *beacon = NULL; 5048 u8 count = 0; 5049 5050 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5051 return 0; 5052 5053 rcu_read_lock(); 5054 5055 link = rcu_dereference(sdata->link[link_id]); 5056 if (!link) 5057 goto unlock; 5058 5059 if (sdata->vif.type == NL80211_IFTYPE_AP) 5060 beacon = rcu_dereference(link->u.ap.beacon); 5061 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5062 beacon = rcu_dereference(sdata->u.ibss.presp); 5063 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5064 beacon = rcu_dereference(sdata->u.mesh.beacon); 5065 5066 if (!beacon) 5067 goto unlock; 5068 5069 count = __ieee80211_beacon_update_cntdwn(beacon); 5070 5071 unlock: 5072 rcu_read_unlock(); 5073 return count; 5074 } 5075 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5076 5077 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5078 { 5079 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5080 struct beacon_data *beacon = NULL; 5081 5082 rcu_read_lock(); 5083 5084 if (sdata->vif.type == NL80211_IFTYPE_AP) 5085 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5086 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5087 beacon = rcu_dereference(sdata->u.ibss.presp); 5088 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5089 beacon = rcu_dereference(sdata->u.mesh.beacon); 5090 5091 if (!beacon) 5092 goto unlock; 5093 5094 if (counter < beacon->cntdwn_current_counter) 5095 beacon->cntdwn_current_counter = counter; 5096 5097 unlock: 5098 rcu_read_unlock(); 5099 } 5100 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5101 5102 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5103 unsigned int link_id) 5104 { 5105 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5106 struct ieee80211_link_data *link; 5107 struct beacon_data *beacon = NULL; 5108 u8 *beacon_data; 5109 size_t beacon_data_len; 5110 int ret = false; 5111 5112 if (!ieee80211_sdata_running(sdata)) 5113 return false; 5114 5115 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5116 return 0; 5117 5118 rcu_read_lock(); 5119 5120 link = rcu_dereference(sdata->link[link_id]); 5121 if (!link) 5122 goto out; 5123 5124 if (vif->type == NL80211_IFTYPE_AP) { 5125 beacon = rcu_dereference(link->u.ap.beacon); 5126 if (WARN_ON(!beacon || !beacon->tail)) 5127 goto out; 5128 beacon_data = beacon->tail; 5129 beacon_data_len = beacon->tail_len; 5130 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5131 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5132 5133 beacon = rcu_dereference(ifibss->presp); 5134 if (!beacon) 5135 goto out; 5136 5137 beacon_data = beacon->head; 5138 beacon_data_len = beacon->head_len; 5139 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5140 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5141 5142 beacon = rcu_dereference(ifmsh->beacon); 5143 if (!beacon) 5144 goto out; 5145 5146 beacon_data = beacon->head; 5147 beacon_data_len = beacon->head_len; 5148 } else { 5149 WARN_ON(1); 5150 goto out; 5151 } 5152 5153 if (!beacon->cntdwn_counter_offsets[0]) 5154 goto out; 5155 5156 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5157 goto out; 5158 5159 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5160 ret = true; 5161 5162 out: 5163 rcu_read_unlock(); 5164 5165 return ret; 5166 } 5167 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5168 5169 static int ieee80211_beacon_protect(struct sk_buff *skb, 5170 struct ieee80211_local *local, 5171 struct ieee80211_sub_if_data *sdata, 5172 struct ieee80211_link_data *link) 5173 { 5174 ieee80211_tx_result res; 5175 struct ieee80211_tx_data tx; 5176 struct sk_buff *check_skb; 5177 5178 memset(&tx, 0, sizeof(tx)); 5179 tx.key = rcu_dereference(link->default_beacon_key); 5180 if (!tx.key) 5181 return 0; 5182 5183 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5184 tx.key = NULL; 5185 return -EINVAL; 5186 } 5187 5188 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5189 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5190 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5191 5192 tx.local = local; 5193 tx.sdata = sdata; 5194 __skb_queue_head_init(&tx.skbs); 5195 __skb_queue_tail(&tx.skbs, skb); 5196 res = ieee80211_tx_h_encrypt(&tx); 5197 check_skb = __skb_dequeue(&tx.skbs); 5198 /* we may crash after this, but it'd be a bug in crypto */ 5199 WARN_ON(check_skb != skb); 5200 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5201 return -EINVAL; 5202 5203 return 0; 5204 } 5205 5206 static void 5207 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5208 struct ieee80211_vif *vif, 5209 struct ieee80211_link_data *link, 5210 struct ieee80211_mutable_offsets *offs, 5211 struct beacon_data *beacon, 5212 struct sk_buff *skb, 5213 struct ieee80211_chanctx_conf *chanctx_conf, 5214 u16 csa_off_base) 5215 { 5216 struct ieee80211_local *local = hw_to_local(hw); 5217 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5218 struct ieee80211_tx_info *info; 5219 enum nl80211_band band; 5220 struct ieee80211_tx_rate_control txrc; 5221 5222 /* CSA offsets */ 5223 if (offs && beacon) { 5224 u16 i; 5225 5226 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5227 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5228 5229 if (!csa_off) 5230 continue; 5231 5232 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5233 } 5234 } 5235 5236 band = chanctx_conf->def.chan->band; 5237 info = IEEE80211_SKB_CB(skb); 5238 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5239 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5240 info->band = band; 5241 5242 memset(&txrc, 0, sizeof(txrc)); 5243 txrc.hw = hw; 5244 txrc.sband = local->hw.wiphy->bands[band]; 5245 txrc.bss_conf = link->conf; 5246 txrc.skb = skb; 5247 txrc.reported_rate.idx = -1; 5248 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5249 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5250 else 5251 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5252 txrc.bss = true; 5253 rate_control_get_rate(sdata, NULL, &txrc); 5254 5255 info->control.vif = vif; 5256 info->control.flags |= u32_encode_bits(link->link_id, 5257 IEEE80211_TX_CTRL_MLO_LINK); 5258 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5259 IEEE80211_TX_CTL_ASSIGN_SEQ | 5260 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5261 } 5262 5263 static void 5264 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5265 u8 i) 5266 { 5267 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5268 i > beacon->mbssid_ies->cnt) 5269 return; 5270 5271 if (i < beacon->mbssid_ies->cnt) { 5272 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5273 beacon->mbssid_ies->elem[i].len); 5274 5275 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5276 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5277 beacon->rnr_ies->elem[i].len); 5278 5279 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5280 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5281 beacon->rnr_ies->elem[i].len); 5282 } 5283 return; 5284 } 5285 5286 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5287 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5288 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5289 beacon->mbssid_ies->elem[i].len); 5290 } 5291 5292 static struct sk_buff * 5293 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5294 struct ieee80211_vif *vif, 5295 struct ieee80211_link_data *link, 5296 struct ieee80211_mutable_offsets *offs, 5297 bool is_template, 5298 struct beacon_data *beacon, 5299 struct ieee80211_chanctx_conf *chanctx_conf, 5300 u8 ema_index) 5301 { 5302 struct ieee80211_local *local = hw_to_local(hw); 5303 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5304 struct ieee80211_if_ap *ap = &sdata->u.ap; 5305 struct sk_buff *skb = NULL; 5306 u16 csa_off_base = 0; 5307 int mbssid_len; 5308 5309 if (beacon->cntdwn_counter_offsets[0]) { 5310 if (!is_template) 5311 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5312 5313 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5314 } 5315 5316 /* headroom, head length, 5317 * tail length, maximum TIM length and multiple BSSID length 5318 */ 5319 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5320 beacon->rnr_ies, 5321 ema_index); 5322 5323 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5324 beacon->tail_len + 256 + 5325 local->hw.extra_beacon_tailroom + mbssid_len); 5326 if (!skb) 5327 return NULL; 5328 5329 skb_reserve(skb, local->tx_headroom); 5330 skb_put_data(skb, beacon->head, beacon->head_len); 5331 5332 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5333 5334 if (offs) { 5335 offs->tim_offset = beacon->head_len; 5336 offs->tim_length = skb->len - beacon->head_len; 5337 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5338 5339 if (mbssid_len) { 5340 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5341 offs->mbssid_off = skb->len - mbssid_len; 5342 } 5343 5344 /* for AP the csa offsets are from tail */ 5345 csa_off_base = skb->len; 5346 } 5347 5348 if (beacon->tail) 5349 skb_put_data(skb, beacon->tail, beacon->tail_len); 5350 5351 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5352 dev_kfree_skb(skb); 5353 return NULL; 5354 } 5355 5356 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5357 chanctx_conf, csa_off_base); 5358 return skb; 5359 } 5360 5361 static struct ieee80211_ema_beacons * 5362 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5363 struct ieee80211_vif *vif, 5364 struct ieee80211_link_data *link, 5365 struct ieee80211_mutable_offsets *offs, 5366 bool is_template, struct beacon_data *beacon, 5367 struct ieee80211_chanctx_conf *chanctx_conf) 5368 { 5369 struct ieee80211_ema_beacons *ema = NULL; 5370 5371 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5372 return NULL; 5373 5374 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5375 GFP_ATOMIC); 5376 if (!ema) 5377 return NULL; 5378 5379 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5380 ema->bcn[ema->cnt].skb = 5381 ieee80211_beacon_get_ap(hw, vif, link, 5382 &ema->bcn[ema->cnt].offs, 5383 is_template, beacon, 5384 chanctx_conf, ema->cnt); 5385 if (!ema->bcn[ema->cnt].skb) 5386 break; 5387 } 5388 5389 if (ema->cnt == beacon->mbssid_ies->cnt) 5390 return ema; 5391 5392 ieee80211_beacon_free_ema_list(ema); 5393 return NULL; 5394 } 5395 5396 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5397 5398 static struct sk_buff * 5399 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5400 struct ieee80211_vif *vif, 5401 struct ieee80211_mutable_offsets *offs, 5402 bool is_template, 5403 unsigned int link_id, 5404 int ema_index, 5405 struct ieee80211_ema_beacons **ema_beacons) 5406 { 5407 struct ieee80211_local *local = hw_to_local(hw); 5408 struct beacon_data *beacon = NULL; 5409 struct sk_buff *skb = NULL; 5410 struct ieee80211_sub_if_data *sdata = NULL; 5411 struct ieee80211_chanctx_conf *chanctx_conf; 5412 struct ieee80211_link_data *link; 5413 5414 rcu_read_lock(); 5415 5416 sdata = vif_to_sdata(vif); 5417 link = rcu_dereference(sdata->link[link_id]); 5418 if (!link) 5419 goto out; 5420 chanctx_conf = 5421 rcu_dereference(link->conf->chanctx_conf); 5422 5423 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5424 goto out; 5425 5426 if (offs) 5427 memset(offs, 0, sizeof(*offs)); 5428 5429 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5430 beacon = rcu_dereference(link->u.ap.beacon); 5431 if (!beacon) 5432 goto out; 5433 5434 if (ema_beacons) { 5435 *ema_beacons = 5436 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5437 offs, 5438 is_template, 5439 beacon, 5440 chanctx_conf); 5441 } else { 5442 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5443 if (ema_index >= beacon->mbssid_ies->cnt) 5444 goto out; /* End of MBSSID elements */ 5445 5446 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5447 ema_index = beacon->mbssid_ies->cnt; 5448 } else { 5449 ema_index = 0; 5450 } 5451 5452 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5453 is_template, beacon, 5454 chanctx_conf, 5455 ema_index); 5456 } 5457 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5458 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5459 struct ieee80211_hdr *hdr; 5460 5461 beacon = rcu_dereference(ifibss->presp); 5462 if (!beacon) 5463 goto out; 5464 5465 if (beacon->cntdwn_counter_offsets[0]) { 5466 if (!is_template) 5467 __ieee80211_beacon_update_cntdwn(beacon); 5468 5469 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5470 } 5471 5472 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5473 local->hw.extra_beacon_tailroom); 5474 if (!skb) 5475 goto out; 5476 skb_reserve(skb, local->tx_headroom); 5477 skb_put_data(skb, beacon->head, beacon->head_len); 5478 5479 hdr = (struct ieee80211_hdr *) skb->data; 5480 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5481 IEEE80211_STYPE_BEACON); 5482 5483 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5484 chanctx_conf, 0); 5485 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5486 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5487 5488 beacon = rcu_dereference(ifmsh->beacon); 5489 if (!beacon) 5490 goto out; 5491 5492 if (beacon->cntdwn_counter_offsets[0]) { 5493 if (!is_template) 5494 /* TODO: For mesh csa_counter is in TU, so 5495 * decrementing it by one isn't correct, but 5496 * for now we leave it consistent with overall 5497 * mac80211's behavior. 5498 */ 5499 __ieee80211_beacon_update_cntdwn(beacon); 5500 5501 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5502 } 5503 5504 if (ifmsh->sync_ops) 5505 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5506 5507 skb = dev_alloc_skb(local->tx_headroom + 5508 beacon->head_len + 5509 256 + /* TIM IE */ 5510 beacon->tail_len + 5511 local->hw.extra_beacon_tailroom); 5512 if (!skb) 5513 goto out; 5514 skb_reserve(skb, local->tx_headroom); 5515 skb_put_data(skb, beacon->head, beacon->head_len); 5516 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5517 is_template); 5518 5519 if (offs) { 5520 offs->tim_offset = beacon->head_len; 5521 offs->tim_length = skb->len - beacon->head_len; 5522 } 5523 5524 skb_put_data(skb, beacon->tail, beacon->tail_len); 5525 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5526 chanctx_conf, 0); 5527 } else { 5528 WARN_ON(1); 5529 goto out; 5530 } 5531 5532 out: 5533 rcu_read_unlock(); 5534 return skb; 5535 5536 } 5537 5538 struct sk_buff * 5539 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5540 struct ieee80211_vif *vif, 5541 struct ieee80211_mutable_offsets *offs, 5542 unsigned int link_id) 5543 { 5544 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5545 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5546 } 5547 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5548 5549 struct sk_buff * 5550 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5551 struct ieee80211_vif *vif, 5552 struct ieee80211_mutable_offsets *offs, 5553 unsigned int link_id, u8 ema_index) 5554 { 5555 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5556 NULL); 5557 } 5558 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5559 5560 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5561 { 5562 u8 i; 5563 5564 if (!ema_beacons) 5565 return; 5566 5567 for (i = 0; i < ema_beacons->cnt; i++) 5568 kfree_skb(ema_beacons->bcn[i].skb); 5569 5570 kfree(ema_beacons); 5571 } 5572 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5573 5574 struct ieee80211_ema_beacons * 5575 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5576 struct ieee80211_vif *vif, 5577 unsigned int link_id) 5578 { 5579 struct ieee80211_ema_beacons *ema_beacons = NULL; 5580 5581 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5582 &ema_beacons)); 5583 5584 return ema_beacons; 5585 } 5586 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5587 5588 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5589 struct ieee80211_vif *vif, 5590 u16 *tim_offset, u16 *tim_length, 5591 unsigned int link_id) 5592 { 5593 struct ieee80211_mutable_offsets offs = {}; 5594 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5595 link_id, 5596 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5597 NULL); 5598 struct sk_buff *copy; 5599 5600 if (!bcn) 5601 return bcn; 5602 5603 if (tim_offset) 5604 *tim_offset = offs.tim_offset; 5605 5606 if (tim_length) 5607 *tim_length = offs.tim_length; 5608 5609 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5610 !hw_to_local(hw)->monitors) 5611 return bcn; 5612 5613 /* send a copy to monitor interfaces */ 5614 copy = skb_copy(bcn, GFP_ATOMIC); 5615 if (!copy) 5616 return bcn; 5617 5618 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, false, NULL); 5619 5620 return bcn; 5621 } 5622 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5623 5624 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5625 struct ieee80211_vif *vif) 5626 { 5627 struct sk_buff *skb = NULL; 5628 struct probe_resp *presp = NULL; 5629 struct ieee80211_hdr *hdr; 5630 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5631 5632 if (sdata->vif.type != NL80211_IFTYPE_AP) 5633 return NULL; 5634 5635 rcu_read_lock(); 5636 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5637 if (!presp) 5638 goto out; 5639 5640 skb = dev_alloc_skb(presp->len); 5641 if (!skb) 5642 goto out; 5643 5644 skb_put_data(skb, presp->data, presp->len); 5645 5646 hdr = (struct ieee80211_hdr *) skb->data; 5647 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5648 5649 out: 5650 rcu_read_unlock(); 5651 return skb; 5652 } 5653 EXPORT_SYMBOL(ieee80211_proberesp_get); 5654 5655 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5656 struct ieee80211_vif *vif) 5657 { 5658 struct sk_buff *skb = NULL; 5659 struct fils_discovery_data *tmpl = NULL; 5660 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5661 5662 if (sdata->vif.type != NL80211_IFTYPE_AP) 5663 return NULL; 5664 5665 rcu_read_lock(); 5666 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5667 if (!tmpl) { 5668 rcu_read_unlock(); 5669 return NULL; 5670 } 5671 5672 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5673 if (skb) { 5674 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5675 skb_put_data(skb, tmpl->data, tmpl->len); 5676 } 5677 5678 rcu_read_unlock(); 5679 return skb; 5680 } 5681 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5682 5683 struct sk_buff * 5684 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5685 struct ieee80211_vif *vif) 5686 { 5687 struct sk_buff *skb = NULL; 5688 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5689 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5690 5691 if (sdata->vif.type != NL80211_IFTYPE_AP) 5692 return NULL; 5693 5694 rcu_read_lock(); 5695 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5696 if (!tmpl) { 5697 rcu_read_unlock(); 5698 return NULL; 5699 } 5700 5701 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5702 if (skb) { 5703 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5704 skb_put_data(skb, tmpl->data, tmpl->len); 5705 } 5706 5707 rcu_read_unlock(); 5708 return skb; 5709 } 5710 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5711 5712 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5713 struct ieee80211_vif *vif) 5714 { 5715 struct ieee80211_sub_if_data *sdata; 5716 struct ieee80211_pspoll *pspoll; 5717 struct ieee80211_local *local; 5718 struct sk_buff *skb; 5719 5720 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5721 return NULL; 5722 5723 sdata = vif_to_sdata(vif); 5724 local = sdata->local; 5725 5726 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5727 if (!skb) 5728 return NULL; 5729 5730 skb_reserve(skb, local->hw.extra_tx_headroom); 5731 5732 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5733 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5734 IEEE80211_STYPE_PSPOLL); 5735 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5736 5737 /* aid in PS-Poll has its two MSBs each set to 1 */ 5738 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5739 5740 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5741 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5742 5743 return skb; 5744 } 5745 EXPORT_SYMBOL(ieee80211_pspoll_get); 5746 5747 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5748 struct ieee80211_vif *vif, 5749 int link_id, bool qos_ok) 5750 { 5751 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5752 struct ieee80211_local *local = sdata->local; 5753 struct ieee80211_link_data *link = NULL; 5754 struct ieee80211_hdr_3addr *nullfunc; 5755 struct sk_buff *skb; 5756 bool qos = false; 5757 5758 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5759 return NULL; 5760 5761 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5762 sizeof(*nullfunc) + 2); 5763 if (!skb) 5764 return NULL; 5765 5766 rcu_read_lock(); 5767 if (qos_ok) { 5768 struct sta_info *sta; 5769 5770 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5771 qos = sta && sta->sta.wme; 5772 } 5773 5774 if (link_id >= 0) { 5775 link = rcu_dereference(sdata->link[link_id]); 5776 if (WARN_ON_ONCE(!link)) { 5777 rcu_read_unlock(); 5778 kfree_skb(skb); 5779 return NULL; 5780 } 5781 } 5782 5783 skb_reserve(skb, local->hw.extra_tx_headroom); 5784 5785 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5786 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5787 IEEE80211_STYPE_NULLFUNC | 5788 IEEE80211_FCTL_TODS); 5789 if (qos) { 5790 __le16 qoshdr = cpu_to_le16(7); 5791 5792 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5793 IEEE80211_STYPE_NULLFUNC) != 5794 IEEE80211_STYPE_QOS_NULLFUNC); 5795 nullfunc->frame_control |= 5796 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5797 skb->priority = 7; 5798 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5799 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5800 } 5801 5802 if (link) { 5803 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5804 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5805 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5806 } else { 5807 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5808 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5809 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5810 } 5811 rcu_read_unlock(); 5812 5813 return skb; 5814 } 5815 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5816 5817 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5818 const u8 *src_addr, 5819 const u8 *ssid, size_t ssid_len, 5820 size_t tailroom) 5821 { 5822 struct ieee80211_local *local = hw_to_local(hw); 5823 struct ieee80211_hdr_3addr *hdr; 5824 struct sk_buff *skb; 5825 size_t ie_ssid_len; 5826 u8 *pos; 5827 5828 ie_ssid_len = 2 + ssid_len; 5829 5830 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5831 ie_ssid_len + tailroom); 5832 if (!skb) 5833 return NULL; 5834 5835 skb_reserve(skb, local->hw.extra_tx_headroom); 5836 5837 hdr = skb_put_zero(skb, sizeof(*hdr)); 5838 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5839 IEEE80211_STYPE_PROBE_REQ); 5840 eth_broadcast_addr(hdr->addr1); 5841 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5842 eth_broadcast_addr(hdr->addr3); 5843 5844 pos = skb_put(skb, ie_ssid_len); 5845 *pos++ = WLAN_EID_SSID; 5846 *pos++ = ssid_len; 5847 if (ssid_len) 5848 memcpy(pos, ssid, ssid_len); 5849 pos += ssid_len; 5850 5851 return skb; 5852 } 5853 EXPORT_SYMBOL(ieee80211_probereq_get); 5854 5855 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5856 const void *frame, size_t frame_len, 5857 const struct ieee80211_tx_info *frame_txctl, 5858 struct ieee80211_rts *rts) 5859 { 5860 const struct ieee80211_hdr *hdr = frame; 5861 5862 rts->frame_control = 5863 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5864 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5865 frame_txctl); 5866 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5867 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5868 } 5869 EXPORT_SYMBOL(ieee80211_rts_get); 5870 5871 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5872 const void *frame, size_t frame_len, 5873 const struct ieee80211_tx_info *frame_txctl, 5874 struct ieee80211_cts *cts) 5875 { 5876 const struct ieee80211_hdr *hdr = frame; 5877 5878 cts->frame_control = 5879 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5880 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5881 frame_len, frame_txctl); 5882 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5883 } 5884 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5885 5886 struct sk_buff * 5887 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5888 struct ieee80211_vif *vif) 5889 { 5890 struct ieee80211_local *local = hw_to_local(hw); 5891 struct sk_buff *skb = NULL; 5892 struct ieee80211_tx_data tx; 5893 struct ieee80211_sub_if_data *sdata; 5894 struct ps_data *ps; 5895 struct ieee80211_tx_info *info; 5896 struct ieee80211_chanctx_conf *chanctx_conf; 5897 5898 sdata = vif_to_sdata(vif); 5899 5900 rcu_read_lock(); 5901 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5902 5903 if (!chanctx_conf) 5904 goto out; 5905 5906 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5907 struct beacon_data *beacon = 5908 rcu_dereference(sdata->deflink.u.ap.beacon); 5909 5910 if (!beacon || !beacon->head) 5911 goto out; 5912 5913 ps = &sdata->u.ap.ps; 5914 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5915 ps = &sdata->u.mesh.ps; 5916 } else { 5917 goto out; 5918 } 5919 5920 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5921 goto out; /* send buffered bc/mc only after DTIM beacon */ 5922 5923 while (1) { 5924 skb = skb_dequeue(&ps->bc_buf); 5925 if (!skb) 5926 goto out; 5927 local->total_ps_buffered--; 5928 5929 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5930 struct ieee80211_hdr *hdr = 5931 (struct ieee80211_hdr *) skb->data; 5932 /* more buffered multicast/broadcast frames ==> set 5933 * MoreData flag in IEEE 802.11 header to inform PS 5934 * STAs */ 5935 hdr->frame_control |= 5936 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5937 } 5938 5939 if (sdata->vif.type == NL80211_IFTYPE_AP) 5940 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5941 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5942 break; 5943 ieee80211_free_txskb(hw, skb); 5944 } 5945 5946 info = IEEE80211_SKB_CB(skb); 5947 5948 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5949 info->band = chanctx_conf->def.chan->band; 5950 5951 if (invoke_tx_handlers(&tx)) 5952 skb = NULL; 5953 out: 5954 rcu_read_unlock(); 5955 5956 return skb; 5957 } 5958 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5959 5960 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5961 { 5962 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5963 struct ieee80211_sub_if_data *sdata = sta->sdata; 5964 struct ieee80211_local *local = sdata->local; 5965 int ret; 5966 u32 queues; 5967 5968 lockdep_assert_wiphy(local->hw.wiphy); 5969 5970 /* only some cases are supported right now */ 5971 switch (sdata->vif.type) { 5972 case NL80211_IFTYPE_STATION: 5973 case NL80211_IFTYPE_AP: 5974 case NL80211_IFTYPE_AP_VLAN: 5975 break; 5976 default: 5977 WARN_ON(1); 5978 return -EINVAL; 5979 } 5980 5981 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5982 return -EINVAL; 5983 5984 if (sta->reserved_tid == tid) { 5985 ret = 0; 5986 goto out; 5987 } 5988 5989 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5990 sdata_err(sdata, "TID reservation already active\n"); 5991 ret = -EALREADY; 5992 goto out; 5993 } 5994 5995 ieee80211_stop_vif_queues(sdata->local, sdata, 5996 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5997 5998 synchronize_net(); 5999 6000 /* Tear down BA sessions so we stop aggregating on this TID */ 6001 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6002 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6003 __ieee80211_stop_tx_ba_session(sta, tid, 6004 AGG_STOP_LOCAL_REQUEST); 6005 } 6006 6007 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6008 __ieee80211_flush_queues(local, sdata, queues, false); 6009 6010 sta->reserved_tid = tid; 6011 6012 ieee80211_wake_vif_queues(local, sdata, 6013 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6014 6015 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6016 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6017 6018 ret = 0; 6019 out: 6020 return ret; 6021 } 6022 EXPORT_SYMBOL(ieee80211_reserve_tid); 6023 6024 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6025 { 6026 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6027 struct ieee80211_sub_if_data *sdata = sta->sdata; 6028 6029 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6030 6031 /* only some cases are supported right now */ 6032 switch (sdata->vif.type) { 6033 case NL80211_IFTYPE_STATION: 6034 case NL80211_IFTYPE_AP: 6035 case NL80211_IFTYPE_AP_VLAN: 6036 break; 6037 default: 6038 WARN_ON(1); 6039 return; 6040 } 6041 6042 if (tid != sta->reserved_tid) { 6043 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6044 return; 6045 } 6046 6047 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6048 } 6049 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6050 6051 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6052 struct sk_buff *skb, int tid, int link_id, 6053 enum nl80211_band band) 6054 { 6055 const struct ieee80211_hdr *hdr = (void *)skb->data; 6056 int ac = ieee80211_ac_from_tid(tid); 6057 unsigned int link; 6058 6059 skb_reset_mac_header(skb); 6060 skb_set_queue_mapping(skb, ac); 6061 skb->priority = tid; 6062 6063 skb->dev = sdata->dev; 6064 6065 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6066 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6067 IEEE80211_LINK_UNSPECIFIED)); 6068 6069 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6070 link = 0; 6071 } else if (link_id >= 0) { 6072 link = link_id; 6073 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6074 /* address from the MLD */ 6075 link = IEEE80211_LINK_UNSPECIFIED; 6076 } else { 6077 /* otherwise must be addressed from a link */ 6078 rcu_read_lock(); 6079 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6080 struct ieee80211_bss_conf *link_conf; 6081 6082 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6083 if (!link_conf) 6084 continue; 6085 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6086 break; 6087 } 6088 rcu_read_unlock(); 6089 6090 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6091 link = ffs(sdata->vif.active_links) - 1; 6092 } 6093 6094 IEEE80211_SKB_CB(skb)->control.flags |= 6095 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6096 6097 /* 6098 * The other path calling ieee80211_xmit is from the tasklet, 6099 * and while we can handle concurrent transmissions locking 6100 * requirements are that we do not come into tx with bhs on. 6101 */ 6102 local_bh_disable(); 6103 IEEE80211_SKB_CB(skb)->band = band; 6104 ieee80211_xmit(sdata, NULL, skb); 6105 local_bh_enable(); 6106 } 6107 6108 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6109 struct sk_buff *skb, int tid, int link_id) 6110 { 6111 struct ieee80211_chanctx_conf *chanctx_conf; 6112 enum nl80211_band band; 6113 6114 rcu_read_lock(); 6115 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6116 WARN_ON(link_id >= 0); 6117 chanctx_conf = 6118 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6119 if (WARN_ON(!chanctx_conf)) { 6120 rcu_read_unlock(); 6121 kfree_skb(skb); 6122 return; 6123 } 6124 band = chanctx_conf->def.chan->band; 6125 } else { 6126 WARN_ON(link_id >= 0 && 6127 !(sdata->vif.active_links & BIT(link_id))); 6128 /* MLD transmissions must not rely on the band */ 6129 band = 0; 6130 } 6131 6132 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6133 rcu_read_unlock(); 6134 } 6135 6136 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6137 const u8 *buf, size_t len, 6138 const u8 *dest, __be16 proto, bool unencrypted, 6139 int link_id, u64 *cookie) 6140 { 6141 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6142 struct ieee80211_local *local = sdata->local; 6143 struct sta_info *sta; 6144 struct sk_buff *skb; 6145 struct ethhdr *ehdr; 6146 u32 ctrl_flags = 0; 6147 u32 flags = 0; 6148 int err; 6149 6150 /* mutex lock is only needed for incrementing the cookie counter */ 6151 lockdep_assert_wiphy(local->hw.wiphy); 6152 6153 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6154 * or Pre-Authentication 6155 */ 6156 if (proto != sdata->control_port_protocol && 6157 proto != cpu_to_be16(ETH_P_PREAUTH)) 6158 return -EINVAL; 6159 6160 if (proto == sdata->control_port_protocol) 6161 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6162 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6163 6164 if (unencrypted) 6165 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6166 6167 if (cookie) 6168 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6169 6170 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6171 6172 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6173 sizeof(struct ethhdr) + len); 6174 if (!skb) 6175 return -ENOMEM; 6176 6177 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6178 6179 skb_put_data(skb, buf, len); 6180 6181 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6182 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6183 6184 /* we may override the SA for MLO STA later */ 6185 if (link_id < 0) { 6186 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6187 IEEE80211_TX_CTRL_MLO_LINK); 6188 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6189 } else { 6190 struct ieee80211_bss_conf *link_conf; 6191 6192 ctrl_flags |= u32_encode_bits(link_id, 6193 IEEE80211_TX_CTRL_MLO_LINK); 6194 6195 rcu_read_lock(); 6196 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6197 if (!link_conf) { 6198 dev_kfree_skb(skb); 6199 rcu_read_unlock(); 6200 return -ENOLINK; 6201 } 6202 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6203 rcu_read_unlock(); 6204 } 6205 6206 ehdr->h_proto = proto; 6207 6208 skb->dev = dev; 6209 skb->protocol = proto; 6210 skb_reset_network_header(skb); 6211 skb_reset_mac_header(skb); 6212 6213 if (local->hw.queues < IEEE80211_NUM_ACS) 6214 goto start_xmit; 6215 6216 /* update QoS header to prioritize control port frames if possible, 6217 * priorization also happens for control port frames send over 6218 * AF_PACKET 6219 */ 6220 rcu_read_lock(); 6221 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6222 if (err) { 6223 dev_kfree_skb(skb); 6224 rcu_read_unlock(); 6225 return err; 6226 } 6227 6228 if (!IS_ERR(sta)) { 6229 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6230 6231 skb_set_queue_mapping(skb, queue); 6232 6233 /* 6234 * for MLO STA, the SA should be the AP MLD address, but 6235 * the link ID has been selected already 6236 */ 6237 if (sta && sta->sta.mlo) 6238 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6239 } 6240 rcu_read_unlock(); 6241 6242 start_xmit: 6243 local_bh_disable(); 6244 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6245 local_bh_enable(); 6246 6247 return 0; 6248 } 6249 6250 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6251 const u8 *buf, size_t len) 6252 { 6253 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6254 struct ieee80211_local *local = sdata->local; 6255 struct sk_buff *skb; 6256 6257 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6258 30 + /* header size */ 6259 18); /* 11s header size */ 6260 if (!skb) 6261 return -ENOMEM; 6262 6263 skb_reserve(skb, local->hw.extra_tx_headroom); 6264 skb_put_data(skb, buf, len); 6265 6266 skb->dev = dev; 6267 skb->protocol = htons(ETH_P_802_3); 6268 skb_reset_network_header(skb); 6269 skb_reset_mac_header(skb); 6270 6271 local_bh_disable(); 6272 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6273 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6274 NULL); 6275 local_bh_enable(); 6276 6277 return 0; 6278 } 6279