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 <asm/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, shift = 0; 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 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 63 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 64 } 65 rcu_read_unlock(); 66 67 /* uh huh? */ 68 if (WARN_ON_ONCE(tx->rate.idx < 0)) 69 return 0; 70 71 sband = local->hw.wiphy->bands[info->band]; 72 txrate = &sband->bitrates[tx->rate.idx]; 73 74 erp = txrate->flags & IEEE80211_RATE_ERP_G; 75 76 /* device is expected to do this */ 77 if (sband->band == NL80211_BAND_S1GHZ) 78 return 0; 79 80 /* 81 * data and mgmt (except PS Poll): 82 * - during CFP: 32768 83 * - during contention period: 84 * if addr1 is group address: 0 85 * if more fragments = 0 and addr1 is individual address: time to 86 * transmit one ACK plus SIFS 87 * if more fragments = 1 and addr1 is individual address: time to 88 * transmit next fragment plus 2 x ACK plus 3 x SIFS 89 * 90 * IEEE 802.11, 9.6: 91 * - control response frame (CTS or ACK) shall be transmitted using the 92 * same rate as the immediately previous frame in the frame exchange 93 * sequence, if this rate belongs to the PHY mandatory rates, or else 94 * at the highest possible rate belonging to the PHY rates in the 95 * BSSBasicRateSet 96 */ 97 hdr = (struct ieee80211_hdr *)skb->data; 98 if (ieee80211_is_ctl(hdr->frame_control)) { 99 /* TODO: These control frames are not currently sent by 100 * mac80211, but should they be implemented, this function 101 * needs to be updated to support duration field calculation. 102 * 103 * RTS: time needed to transmit pending data/mgmt frame plus 104 * one CTS frame plus one ACK frame plus 3 x SIFS 105 * CTS: duration of immediately previous RTS minus time 106 * required to transmit CTS and its SIFS 107 * ACK: 0 if immediately previous directed data/mgmt had 108 * more=0, with more=1 duration in ACK frame is duration 109 * from previous frame minus time needed to transmit ACK 110 * and its SIFS 111 * PS Poll: BIT(15) | BIT(14) | aid 112 */ 113 return 0; 114 } 115 116 /* data/mgmt */ 117 if (0 /* FIX: data/mgmt during CFP */) 118 return cpu_to_le16(32768); 119 120 if (group_addr) /* Group address as the destination - no ACK */ 121 return 0; 122 123 /* Individual destination address: 124 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 125 * CTS and ACK frames shall be transmitted using the highest rate in 126 * basic rate set that is less than or equal to the rate of the 127 * immediately previous frame and that is using the same modulation 128 * (CCK or OFDM). If no basic rate set matches with these requirements, 129 * the highest mandatory rate of the PHY that is less than or equal to 130 * the rate of the previous frame is used. 131 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 132 */ 133 rate = -1; 134 /* use lowest available if everything fails */ 135 mrate = sband->bitrates[0].bitrate; 136 for (i = 0; i < sband->n_bitrates; i++) { 137 struct ieee80211_rate *r = &sband->bitrates[i]; 138 139 if (r->bitrate > txrate->bitrate) 140 break; 141 142 if ((rate_flags & r->flags) != rate_flags) 143 continue; 144 145 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 146 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 147 148 switch (sband->band) { 149 case NL80211_BAND_2GHZ: 150 case NL80211_BAND_LC: { 151 u32 flag; 152 if (tx->sdata->deflink.operating_11g_mode) 153 flag = IEEE80211_RATE_MANDATORY_G; 154 else 155 flag = IEEE80211_RATE_MANDATORY_B; 156 if (r->flags & flag) 157 mrate = r->bitrate; 158 break; 159 } 160 case NL80211_BAND_5GHZ: 161 case NL80211_BAND_6GHZ: 162 if (r->flags & IEEE80211_RATE_MANDATORY_A) 163 mrate = r->bitrate; 164 break; 165 case NL80211_BAND_S1GHZ: 166 case NL80211_BAND_60GHZ: 167 /* TODO, for now fall through */ 168 case NUM_NL80211_BANDS: 169 WARN_ON(1); 170 break; 171 } 172 } 173 if (rate == -1) { 174 /* No matching basic rate found; use highest suitable mandatory 175 * PHY rate */ 176 rate = DIV_ROUND_UP(mrate, 1 << shift); 177 } 178 179 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 180 if (ieee80211_is_data_qos(hdr->frame_control) && 181 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 182 dur = 0; 183 else 184 /* Time needed to transmit ACK 185 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 186 * to closest integer */ 187 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 188 tx->sdata->vif.bss_conf.use_short_preamble, 189 shift); 190 191 if (next_frag_len) { 192 /* Frame is fragmented: duration increases with time needed to 193 * transmit next fragment plus ACK and 2 x SIFS. */ 194 dur *= 2; /* ACK + SIFS */ 195 /* next fragment */ 196 dur += ieee80211_frame_duration(sband->band, next_frag_len, 197 txrate->bitrate, erp, 198 tx->sdata->vif.bss_conf.use_short_preamble, 199 shift); 200 } 201 202 return cpu_to_le16(dur); 203 } 204 205 /* tx handlers */ 206 static ieee80211_tx_result debug_noinline 207 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 208 { 209 struct ieee80211_local *local = tx->local; 210 struct ieee80211_if_managed *ifmgd; 211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 ieee80211_queue_work(&local->hw, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline 284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_any_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 315 return TX_CONTINUE; 316 317 if (tx->sta) 318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 319 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 321 if (unlikely(!assoc && 322 ieee80211_is_data(hdr->frame_control))) { 323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 324 sdata_info(tx->sdata, 325 "dropped data frame to not associated station %pM\n", 326 hdr->addr1); 327 #endif 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 329 return TX_DROP; 330 } 331 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 332 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 333 /* 334 * No associated STAs - no need to send multicast 335 * frames. 336 */ 337 return TX_DROP; 338 } 339 340 return TX_CONTINUE; 341 } 342 343 /* This function is called whenever the AP is about to exceed the maximum limit 344 * of buffered frames for power saving STAs. This situation should not really 345 * happen often during normal operation, so dropping the oldest buffered packet 346 * from each queue should be OK to make some room for new frames. */ 347 static void purge_old_ps_buffers(struct ieee80211_local *local) 348 { 349 int total = 0, purged = 0; 350 struct sk_buff *skb; 351 struct ieee80211_sub_if_data *sdata; 352 struct sta_info *sta; 353 354 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 355 struct ps_data *ps; 356 357 if (sdata->vif.type == NL80211_IFTYPE_AP) 358 ps = &sdata->u.ap.ps; 359 else if (ieee80211_vif_is_mesh(&sdata->vif)) 360 ps = &sdata->u.mesh.ps; 361 else 362 continue; 363 364 skb = skb_dequeue(&ps->bc_buf); 365 if (skb) { 366 purged++; 367 ieee80211_free_txskb(&local->hw, skb); 368 } 369 total += skb_queue_len(&ps->bc_buf); 370 } 371 372 /* 373 * Drop one frame from each station from the lowest-priority 374 * AC that has frames at all. 375 */ 376 list_for_each_entry_rcu(sta, &local->sta_list, list) { 377 int ac; 378 379 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 380 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 381 total += skb_queue_len(&sta->ps_tx_buf[ac]); 382 if (skb) { 383 purged++; 384 ieee80211_free_txskb(&local->hw, skb); 385 break; 386 } 387 } 388 } 389 390 local->total_ps_buffered = total; 391 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 392 } 393 394 static ieee80211_tx_result 395 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 396 { 397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 399 struct ps_data *ps; 400 401 /* 402 * broadcast/multicast frame 403 * 404 * If any of the associated/peer stations is in power save mode, 405 * the frame is buffered to be sent after DTIM beacon frame. 406 * This is done either by the hardware or us. 407 */ 408 409 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 410 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 411 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 412 if (!tx->sdata->bss) 413 return TX_CONTINUE; 414 415 ps = &tx->sdata->bss->ps; 416 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 417 ps = &tx->sdata->u.mesh.ps; 418 } else { 419 return TX_CONTINUE; 420 } 421 422 423 /* no buffering for ordered frames */ 424 if (ieee80211_has_order(hdr->frame_control)) 425 return TX_CONTINUE; 426 427 if (ieee80211_is_probe_req(hdr->frame_control)) 428 return TX_CONTINUE; 429 430 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 431 info->hw_queue = tx->sdata->vif.cab_queue; 432 433 /* no stations in PS mode and no buffered packets */ 434 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 435 return TX_CONTINUE; 436 437 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 438 439 /* device releases frame after DTIM beacon */ 440 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 441 return TX_CONTINUE; 442 443 /* buffered in mac80211 */ 444 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 445 purge_old_ps_buffers(tx->local); 446 447 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 448 ps_dbg(tx->sdata, 449 "BC TX buffer full - dropping the oldest frame\n"); 450 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 451 } else 452 tx->local->total_ps_buffered++; 453 454 skb_queue_tail(&ps->bc_buf, tx->skb); 455 456 return TX_QUEUED; 457 } 458 459 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 460 struct sk_buff *skb) 461 { 462 if (!ieee80211_is_mgmt(fc)) 463 return 0; 464 465 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 466 return 0; 467 468 if (!ieee80211_is_robust_mgmt_frame(skb)) 469 return 0; 470 471 return 1; 472 } 473 474 static ieee80211_tx_result 475 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 476 { 477 struct sta_info *sta = tx->sta; 478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 480 struct ieee80211_local *local = tx->local; 481 482 if (unlikely(!sta)) 483 return TX_CONTINUE; 484 485 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 486 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 487 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 488 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 489 int ac = skb_get_queue_mapping(tx->skb); 490 491 if (ieee80211_is_mgmt(hdr->frame_control) && 492 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 493 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 494 return TX_CONTINUE; 495 } 496 497 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 498 sta->sta.addr, sta->sta.aid, ac); 499 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 500 purge_old_ps_buffers(tx->local); 501 502 /* sync with ieee80211_sta_ps_deliver_wakeup */ 503 spin_lock(&sta->ps_lock); 504 /* 505 * STA woke up the meantime and all the frames on ps_tx_buf have 506 * been queued to pending queue. No reordering can happen, go 507 * ahead and Tx the packet. 508 */ 509 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 510 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 511 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 512 spin_unlock(&sta->ps_lock); 513 return TX_CONTINUE; 514 } 515 516 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 517 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 518 ps_dbg(tx->sdata, 519 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 520 sta->sta.addr, ac); 521 ieee80211_free_txskb(&local->hw, old); 522 } else 523 tx->local->total_ps_buffered++; 524 525 info->control.jiffies = jiffies; 526 info->control.vif = &tx->sdata->vif; 527 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 528 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 529 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 530 spin_unlock(&sta->ps_lock); 531 532 if (!timer_pending(&local->sta_cleanup)) 533 mod_timer(&local->sta_cleanup, 534 round_jiffies(jiffies + 535 STA_INFO_CLEANUP_INTERVAL)); 536 537 /* 538 * We queued up some frames, so the TIM bit might 539 * need to be set, recalculate it. 540 */ 541 sta_info_recalc_tim(sta); 542 543 return TX_QUEUED; 544 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 545 ps_dbg(tx->sdata, 546 "STA %pM in PS mode, but polling/in SP -> send frame\n", 547 sta->sta.addr); 548 } 549 550 return TX_CONTINUE; 551 } 552 553 static ieee80211_tx_result debug_noinline 554 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 555 { 556 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 557 return TX_CONTINUE; 558 559 if (tx->flags & IEEE80211_TX_UNICAST) 560 return ieee80211_tx_h_unicast_ps_buf(tx); 561 else 562 return ieee80211_tx_h_multicast_ps_buf(tx); 563 } 564 565 static ieee80211_tx_result debug_noinline 566 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 567 { 568 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 569 570 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 571 if (tx->sdata->control_port_no_encrypt) 572 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 573 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 574 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 575 } 576 577 return TX_CONTINUE; 578 } 579 580 static struct ieee80211_key * 581 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 582 { 583 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 584 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 585 struct ieee80211_link_data *link; 586 unsigned int link_id; 587 588 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 589 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 590 link = &tx->sdata->deflink; 591 } else { 592 link = rcu_dereference(tx->sdata->link[link_id]); 593 if (!link) 594 return NULL; 595 } 596 597 if (ieee80211_is_group_privacy_action(tx->skb)) 598 return rcu_dereference(link->default_multicast_key); 599 else if (ieee80211_is_mgmt(hdr->frame_control) && 600 is_multicast_ether_addr(hdr->addr1) && 601 ieee80211_is_robust_mgmt_frame(tx->skb)) 602 return rcu_dereference(link->default_mgmt_key); 603 else if (is_multicast_ether_addr(hdr->addr1)) 604 return rcu_dereference(link->default_multicast_key); 605 606 return NULL; 607 } 608 609 static ieee80211_tx_result debug_noinline 610 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 611 { 612 struct ieee80211_key *key; 613 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 614 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 615 616 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 617 tx->key = NULL; 618 return TX_CONTINUE; 619 } 620 621 if (tx->sta && 622 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 623 tx->key = key; 624 else if ((key = ieee80211_select_link_key(tx))) 625 tx->key = key; 626 else if (!is_multicast_ether_addr(hdr->addr1) && 627 (key = rcu_dereference(tx->sdata->default_unicast_key))) 628 tx->key = key; 629 else 630 tx->key = NULL; 631 632 if (tx->key) { 633 bool skip_hw = false; 634 635 /* TODO: add threshold stuff again */ 636 637 switch (tx->key->conf.cipher) { 638 case WLAN_CIPHER_SUITE_WEP40: 639 case WLAN_CIPHER_SUITE_WEP104: 640 case WLAN_CIPHER_SUITE_TKIP: 641 if (!ieee80211_is_data_present(hdr->frame_control)) 642 tx->key = NULL; 643 break; 644 case WLAN_CIPHER_SUITE_CCMP: 645 case WLAN_CIPHER_SUITE_CCMP_256: 646 case WLAN_CIPHER_SUITE_GCMP: 647 case WLAN_CIPHER_SUITE_GCMP_256: 648 if (!ieee80211_is_data_present(hdr->frame_control) && 649 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 650 tx->skb) && 651 !ieee80211_is_group_privacy_action(tx->skb)) 652 tx->key = NULL; 653 else 654 skip_hw = (tx->key->conf.flags & 655 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 656 ieee80211_is_mgmt(hdr->frame_control); 657 break; 658 case WLAN_CIPHER_SUITE_AES_CMAC: 659 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 660 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 661 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 662 if (!ieee80211_is_mgmt(hdr->frame_control)) 663 tx->key = NULL; 664 break; 665 } 666 667 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 668 !ieee80211_is_deauth(hdr->frame_control)) && 669 tx->skb->protocol != tx->sdata->control_port_protocol) 670 return TX_DROP; 671 672 if (!skip_hw && tx->key && 673 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 674 info->control.hw_key = &tx->key->conf; 675 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 676 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 677 return TX_DROP; 678 } 679 680 return TX_CONTINUE; 681 } 682 683 static ieee80211_tx_result debug_noinline 684 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 685 { 686 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 687 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 688 struct ieee80211_supported_band *sband; 689 u32 len; 690 struct ieee80211_tx_rate_control txrc; 691 struct ieee80211_sta_rates *ratetbl = NULL; 692 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 693 bool assoc = false; 694 695 memset(&txrc, 0, sizeof(txrc)); 696 697 sband = tx->local->hw.wiphy->bands[info->band]; 698 699 len = min_t(u32, tx->skb->len + FCS_LEN, 700 tx->local->hw.wiphy->frag_threshold); 701 702 /* set up the tx rate control struct we give the RC algo */ 703 txrc.hw = &tx->local->hw; 704 txrc.sband = sband; 705 txrc.bss_conf = &tx->sdata->vif.bss_conf; 706 txrc.skb = tx->skb; 707 txrc.reported_rate.idx = -1; 708 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 709 710 if (tx->sdata->rc_has_mcs_mask[info->band]) 711 txrc.rate_idx_mcs_mask = 712 tx->sdata->rc_rateidx_mcs_mask[info->band]; 713 714 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 715 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 716 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 717 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 718 719 /* set up RTS protection if desired */ 720 if (len > tx->local->hw.wiphy->rts_threshold) { 721 txrc.rts = true; 722 } 723 724 info->control.use_rts = txrc.rts; 725 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 726 727 /* 728 * Use short preamble if the BSS can handle it, but not for 729 * management frames unless we know the receiver can handle 730 * that -- the management frame might be to a station that 731 * just wants a probe response. 732 */ 733 if (tx->sdata->vif.bss_conf.use_short_preamble && 734 (ieee80211_is_tx_data(tx->skb) || 735 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 736 txrc.short_preamble = true; 737 738 info->control.short_preamble = txrc.short_preamble; 739 740 /* don't ask rate control when rate already injected via radiotap */ 741 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 742 return TX_CONTINUE; 743 744 if (tx->sta) 745 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 746 747 /* 748 * Lets not bother rate control if we're associated and cannot 749 * talk to the sta. This should not happen. 750 */ 751 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 752 !rate_usable_index_exists(sband, &tx->sta->sta), 753 "%s: Dropped data frame as no usable bitrate found while " 754 "scanning and associated. Target station: " 755 "%pM on %d GHz band\n", 756 tx->sdata->name, 757 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 758 info->band ? 5 : 2)) 759 return TX_DROP; 760 761 /* 762 * If we're associated with the sta at this point we know we can at 763 * least send the frame at the lowest bit rate. 764 */ 765 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 766 767 if (tx->sta && !info->control.skip_table) 768 ratetbl = rcu_dereference(tx->sta->sta.rates); 769 770 if (unlikely(info->control.rates[0].idx < 0)) { 771 if (ratetbl) { 772 struct ieee80211_tx_rate rate = { 773 .idx = ratetbl->rate[0].idx, 774 .flags = ratetbl->rate[0].flags, 775 .count = ratetbl->rate[0].count 776 }; 777 778 if (ratetbl->rate[0].idx < 0) 779 return TX_DROP; 780 781 tx->rate = rate; 782 } else { 783 return TX_DROP; 784 } 785 } else { 786 tx->rate = info->control.rates[0]; 787 } 788 789 if (txrc.reported_rate.idx < 0) { 790 txrc.reported_rate = tx->rate; 791 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 792 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 793 } else if (tx->sta) 794 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 795 796 if (ratetbl) 797 return TX_CONTINUE; 798 799 if (unlikely(!info->control.rates[0].count)) 800 info->control.rates[0].count = 1; 801 802 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 803 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 804 info->control.rates[0].count = 1; 805 806 return TX_CONTINUE; 807 } 808 809 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 810 { 811 u16 *seq = &sta->tid_seq[tid]; 812 __le16 ret = cpu_to_le16(*seq); 813 814 /* Increase the sequence number. */ 815 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 816 817 return ret; 818 } 819 820 static ieee80211_tx_result debug_noinline 821 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 822 { 823 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 825 int tid; 826 827 /* 828 * Packet injection may want to control the sequence 829 * number, if we have no matching interface then we 830 * neither assign one ourselves nor ask the driver to. 831 */ 832 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 833 return TX_CONTINUE; 834 835 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 836 return TX_CONTINUE; 837 838 if (ieee80211_hdrlen(hdr->frame_control) < 24) 839 return TX_CONTINUE; 840 841 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 842 return TX_CONTINUE; 843 844 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 845 return TX_CONTINUE; 846 847 /* SNS11 from 802.11be 10.3.2.14 */ 848 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 849 ieee80211_vif_is_mld(info->control.vif) && 850 info->control.vif->type == NL80211_IFTYPE_AP)) { 851 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 852 tx->sdata->mld_mcast_seq += 0x10; 853 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 854 return TX_CONTINUE; 855 } 856 857 /* 858 * Anything but QoS data that has a sequence number field 859 * (is long enough) gets a sequence number from the global 860 * counter. QoS data frames with a multicast destination 861 * also use the global counter (802.11-2012 9.3.2.10). 862 */ 863 if (!ieee80211_is_data_qos(hdr->frame_control) || 864 is_multicast_ether_addr(hdr->addr1)) { 865 /* driver should assign sequence number */ 866 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 867 /* for pure STA mode without beacons, we can do it */ 868 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 869 tx->sdata->sequence_number += 0x10; 870 if (tx->sta) 871 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 872 return TX_CONTINUE; 873 } 874 875 /* 876 * This should be true for injected/management frames only, for 877 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 878 * above since they are not QoS-data frames. 879 */ 880 if (!tx->sta) 881 return TX_CONTINUE; 882 883 /* include per-STA, per-TID sequence counter */ 884 tid = ieee80211_get_tid(hdr); 885 tx->sta->deflink.tx_stats.msdu[tid]++; 886 887 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 888 889 return TX_CONTINUE; 890 } 891 892 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 893 struct sk_buff *skb, int hdrlen, 894 int frag_threshold) 895 { 896 struct ieee80211_local *local = tx->local; 897 struct ieee80211_tx_info *info; 898 struct sk_buff *tmp; 899 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 900 int pos = hdrlen + per_fragm; 901 int rem = skb->len - hdrlen - per_fragm; 902 903 if (WARN_ON(rem < 0)) 904 return -EINVAL; 905 906 /* first fragment was already added to queue by caller */ 907 908 while (rem) { 909 int fraglen = per_fragm; 910 911 if (fraglen > rem) 912 fraglen = rem; 913 rem -= fraglen; 914 tmp = dev_alloc_skb(local->tx_headroom + 915 frag_threshold + 916 IEEE80211_ENCRYPT_HEADROOM + 917 IEEE80211_ENCRYPT_TAILROOM); 918 if (!tmp) 919 return -ENOMEM; 920 921 __skb_queue_tail(&tx->skbs, tmp); 922 923 skb_reserve(tmp, 924 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 925 926 /* copy control information */ 927 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 928 929 info = IEEE80211_SKB_CB(tmp); 930 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 931 IEEE80211_TX_CTL_FIRST_FRAGMENT); 932 933 if (rem) 934 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 935 936 skb_copy_queue_mapping(tmp, skb); 937 tmp->priority = skb->priority; 938 tmp->dev = skb->dev; 939 940 /* copy header and data */ 941 skb_put_data(tmp, skb->data, hdrlen); 942 skb_put_data(tmp, skb->data + pos, fraglen); 943 944 pos += fraglen; 945 } 946 947 /* adjust first fragment's length */ 948 skb_trim(skb, hdrlen + per_fragm); 949 return 0; 950 } 951 952 static ieee80211_tx_result debug_noinline 953 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 954 { 955 struct sk_buff *skb = tx->skb; 956 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 957 struct ieee80211_hdr *hdr = (void *)skb->data; 958 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 959 int hdrlen; 960 int fragnum; 961 962 /* no matter what happens, tx->skb moves to tx->skbs */ 963 __skb_queue_tail(&tx->skbs, skb); 964 tx->skb = NULL; 965 966 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 967 return TX_CONTINUE; 968 969 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 970 return TX_CONTINUE; 971 972 /* 973 * Warn when submitting a fragmented A-MPDU frame and drop it. 974 * This scenario is handled in ieee80211_tx_prepare but extra 975 * caution taken here as fragmented ampdu may cause Tx stop. 976 */ 977 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 978 return TX_DROP; 979 980 hdrlen = ieee80211_hdrlen(hdr->frame_control); 981 982 /* internal error, why isn't DONTFRAG set? */ 983 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 984 return TX_DROP; 985 986 /* 987 * Now fragment the frame. This will allocate all the fragments and 988 * chain them (using skb as the first fragment) to skb->next. 989 * During transmission, we will remove the successfully transmitted 990 * fragments from this list. When the low-level driver rejects one 991 * of the fragments then we will simply pretend to accept the skb 992 * but store it away as pending. 993 */ 994 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 995 return TX_DROP; 996 997 /* update duration/seq/flags of fragments */ 998 fragnum = 0; 999 1000 skb_queue_walk(&tx->skbs, skb) { 1001 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1002 1003 hdr = (void *)skb->data; 1004 info = IEEE80211_SKB_CB(skb); 1005 1006 if (!skb_queue_is_last(&tx->skbs, skb)) { 1007 hdr->frame_control |= morefrags; 1008 /* 1009 * No multi-rate retries for fragmented frames, that 1010 * would completely throw off the NAV at other STAs. 1011 */ 1012 info->control.rates[1].idx = -1; 1013 info->control.rates[2].idx = -1; 1014 info->control.rates[3].idx = -1; 1015 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1016 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1017 } else { 1018 hdr->frame_control &= ~morefrags; 1019 } 1020 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1021 fragnum++; 1022 } 1023 1024 return TX_CONTINUE; 1025 } 1026 1027 static ieee80211_tx_result debug_noinline 1028 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1029 { 1030 struct sk_buff *skb; 1031 int ac = -1; 1032 1033 if (!tx->sta) 1034 return TX_CONTINUE; 1035 1036 skb_queue_walk(&tx->skbs, skb) { 1037 ac = skb_get_queue_mapping(skb); 1038 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1039 } 1040 if (ac >= 0) 1041 tx->sta->deflink.tx_stats.packets[ac]++; 1042 1043 return TX_CONTINUE; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1048 { 1049 if (!tx->key) 1050 return TX_CONTINUE; 1051 1052 switch (tx->key->conf.cipher) { 1053 case WLAN_CIPHER_SUITE_WEP40: 1054 case WLAN_CIPHER_SUITE_WEP104: 1055 return ieee80211_crypto_wep_encrypt(tx); 1056 case WLAN_CIPHER_SUITE_TKIP: 1057 return ieee80211_crypto_tkip_encrypt(tx); 1058 case WLAN_CIPHER_SUITE_CCMP: 1059 return ieee80211_crypto_ccmp_encrypt( 1060 tx, IEEE80211_CCMP_MIC_LEN); 1061 case WLAN_CIPHER_SUITE_CCMP_256: 1062 return ieee80211_crypto_ccmp_encrypt( 1063 tx, IEEE80211_CCMP_256_MIC_LEN); 1064 case WLAN_CIPHER_SUITE_AES_CMAC: 1065 return ieee80211_crypto_aes_cmac_encrypt(tx); 1066 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1067 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1068 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1069 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1070 return ieee80211_crypto_aes_gmac_encrypt(tx); 1071 case WLAN_CIPHER_SUITE_GCMP: 1072 case WLAN_CIPHER_SUITE_GCMP_256: 1073 return ieee80211_crypto_gcmp_encrypt(tx); 1074 } 1075 1076 return TX_DROP; 1077 } 1078 1079 static ieee80211_tx_result debug_noinline 1080 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1081 { 1082 struct sk_buff *skb; 1083 struct ieee80211_hdr *hdr; 1084 int next_len; 1085 bool group_addr; 1086 1087 skb_queue_walk(&tx->skbs, skb) { 1088 hdr = (void *) skb->data; 1089 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1090 break; /* must not overwrite AID */ 1091 if (!skb_queue_is_last(&tx->skbs, skb)) { 1092 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1093 next_len = next->len; 1094 } else 1095 next_len = 0; 1096 group_addr = is_multicast_ether_addr(hdr->addr1); 1097 1098 hdr->duration_id = 1099 ieee80211_duration(tx, skb, group_addr, next_len); 1100 } 1101 1102 return TX_CONTINUE; 1103 } 1104 1105 /* actual transmit path */ 1106 1107 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1108 struct sk_buff *skb, 1109 struct ieee80211_tx_info *info, 1110 struct tid_ampdu_tx *tid_tx, 1111 int tid) 1112 { 1113 bool queued = false; 1114 bool reset_agg_timer = false; 1115 struct sk_buff *purge_skb = NULL; 1116 1117 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1118 reset_agg_timer = true; 1119 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1120 /* 1121 * nothing -- this aggregation session is being started 1122 * but that might still fail with the driver 1123 */ 1124 } else if (!tx->sta->sta.txq[tid]) { 1125 spin_lock(&tx->sta->lock); 1126 /* 1127 * Need to re-check now, because we may get here 1128 * 1129 * 1) in the window during which the setup is actually 1130 * already done, but not marked yet because not all 1131 * packets are spliced over to the driver pending 1132 * queue yet -- if this happened we acquire the lock 1133 * either before or after the splice happens, but 1134 * need to recheck which of these cases happened. 1135 * 1136 * 2) during session teardown, if the OPERATIONAL bit 1137 * was cleared due to the teardown but the pointer 1138 * hasn't been assigned NULL yet (or we loaded it 1139 * before it was assigned) -- in this case it may 1140 * now be NULL which means we should just let the 1141 * packet pass through because splicing the frames 1142 * back is already done. 1143 */ 1144 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1145 1146 if (!tid_tx) { 1147 /* do nothing, let packet pass through */ 1148 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1149 reset_agg_timer = true; 1150 } else { 1151 queued = true; 1152 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1153 clear_sta_flag(tx->sta, WLAN_STA_SP); 1154 ps_dbg(tx->sta->sdata, 1155 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1156 tx->sta->sta.addr, tx->sta->sta.aid); 1157 } 1158 info->control.vif = &tx->sdata->vif; 1159 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1160 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1161 __skb_queue_tail(&tid_tx->pending, skb); 1162 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1163 purge_skb = __skb_dequeue(&tid_tx->pending); 1164 } 1165 spin_unlock(&tx->sta->lock); 1166 1167 if (purge_skb) 1168 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1169 } 1170 1171 /* reset session timer */ 1172 if (reset_agg_timer) 1173 tid_tx->last_tx = jiffies; 1174 1175 return queued; 1176 } 1177 1178 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1179 struct sta_info *sta, struct sk_buff *skb) 1180 { 1181 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1182 u16 tid; 1183 1184 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1185 return; 1186 1187 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1188 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1189 skb->protocol == sdata->control_port_protocol) 1190 return; 1191 1192 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1193 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1194 return; 1195 1196 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1197 } 1198 1199 /* 1200 * initialises @tx 1201 * pass %NULL for the station if unknown, a valid pointer if known 1202 * or an ERR_PTR() if the station is known not to exist 1203 */ 1204 static ieee80211_tx_result 1205 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1206 struct ieee80211_tx_data *tx, 1207 struct sta_info *sta, struct sk_buff *skb) 1208 { 1209 struct ieee80211_local *local = sdata->local; 1210 struct ieee80211_hdr *hdr; 1211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1212 bool aggr_check = false; 1213 int tid; 1214 1215 memset(tx, 0, sizeof(*tx)); 1216 tx->skb = skb; 1217 tx->local = local; 1218 tx->sdata = sdata; 1219 __skb_queue_head_init(&tx->skbs); 1220 1221 /* 1222 * If this flag is set to true anywhere, and we get here, 1223 * we are doing the needed processing, so remove the flag 1224 * now. 1225 */ 1226 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1227 1228 hdr = (struct ieee80211_hdr *) skb->data; 1229 1230 if (likely(sta)) { 1231 if (!IS_ERR(sta)) 1232 tx->sta = sta; 1233 } else { 1234 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1235 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1236 if (!tx->sta && sdata->wdev.use_4addr) 1237 return TX_DROP; 1238 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1239 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1240 } 1241 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1242 tx->sta = sta_info_get(sdata, hdr->addr1); 1243 aggr_check = true; 1244 } 1245 } 1246 1247 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1248 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1249 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1250 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1251 struct tid_ampdu_tx *tid_tx; 1252 1253 tid = ieee80211_get_tid(hdr); 1254 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1255 if (!tid_tx && aggr_check) { 1256 ieee80211_aggr_check(sdata, tx->sta, skb); 1257 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1258 } 1259 1260 if (tid_tx) { 1261 bool queued; 1262 1263 queued = ieee80211_tx_prep_agg(tx, skb, info, 1264 tid_tx, tid); 1265 1266 if (unlikely(queued)) 1267 return TX_QUEUED; 1268 } 1269 } 1270 1271 if (is_multicast_ether_addr(hdr->addr1)) { 1272 tx->flags &= ~IEEE80211_TX_UNICAST; 1273 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1274 } else 1275 tx->flags |= IEEE80211_TX_UNICAST; 1276 1277 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1278 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1279 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1280 info->flags & IEEE80211_TX_CTL_AMPDU) 1281 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1282 } 1283 1284 if (!tx->sta) 1285 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1286 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1287 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1288 ieee80211_check_fast_xmit(tx->sta); 1289 } 1290 1291 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1292 1293 return TX_CONTINUE; 1294 } 1295 1296 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1297 struct ieee80211_vif *vif, 1298 struct sta_info *sta, 1299 struct sk_buff *skb) 1300 { 1301 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1302 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1303 struct ieee80211_txq *txq = NULL; 1304 1305 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1306 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1307 return NULL; 1308 1309 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1310 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1311 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1312 ieee80211_is_bufferable_mmpdu(skb) || 1313 vif->type == NL80211_IFTYPE_STATION) && 1314 sta && sta->uploaded) { 1315 /* 1316 * This will be NULL if the driver didn't set the 1317 * opt-in hardware flag. 1318 */ 1319 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1320 } 1321 } else if (sta) { 1322 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1323 1324 if (!sta->uploaded) 1325 return NULL; 1326 1327 txq = sta->sta.txq[tid]; 1328 } else { 1329 txq = vif->txq; 1330 } 1331 1332 if (!txq) 1333 return NULL; 1334 1335 return to_txq_info(txq); 1336 } 1337 1338 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1339 { 1340 struct sk_buff *next; 1341 codel_time_t now = codel_get_time(); 1342 1343 skb_list_walk_safe(skb, skb, next) 1344 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1345 } 1346 1347 static u32 codel_skb_len_func(const struct sk_buff *skb) 1348 { 1349 return skb->len; 1350 } 1351 1352 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1353 { 1354 const struct ieee80211_tx_info *info; 1355 1356 info = (const struct ieee80211_tx_info *)skb->cb; 1357 return info->control.enqueue_time; 1358 } 1359 1360 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1361 void *ctx) 1362 { 1363 struct ieee80211_local *local; 1364 struct txq_info *txqi; 1365 struct fq *fq; 1366 struct fq_flow *flow; 1367 1368 txqi = ctx; 1369 local = vif_to_sdata(txqi->txq.vif)->local; 1370 fq = &local->fq; 1371 1372 if (cvars == &txqi->def_cvars) 1373 flow = &txqi->tin.default_flow; 1374 else 1375 flow = &fq->flows[cvars - local->cvars]; 1376 1377 return fq_flow_dequeue(fq, flow); 1378 } 1379 1380 static void codel_drop_func(struct sk_buff *skb, 1381 void *ctx) 1382 { 1383 struct ieee80211_local *local; 1384 struct ieee80211_hw *hw; 1385 struct txq_info *txqi; 1386 1387 txqi = ctx; 1388 local = vif_to_sdata(txqi->txq.vif)->local; 1389 hw = &local->hw; 1390 1391 ieee80211_free_txskb(hw, skb); 1392 } 1393 1394 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1395 struct fq_tin *tin, 1396 struct fq_flow *flow) 1397 { 1398 struct ieee80211_local *local; 1399 struct txq_info *txqi; 1400 struct codel_vars *cvars; 1401 struct codel_params *cparams; 1402 struct codel_stats *cstats; 1403 1404 local = container_of(fq, struct ieee80211_local, fq); 1405 txqi = container_of(tin, struct txq_info, tin); 1406 cstats = &txqi->cstats; 1407 1408 if (txqi->txq.sta) { 1409 struct sta_info *sta = container_of(txqi->txq.sta, 1410 struct sta_info, sta); 1411 cparams = &sta->cparams; 1412 } else { 1413 cparams = &local->cparams; 1414 } 1415 1416 if (flow == &tin->default_flow) 1417 cvars = &txqi->def_cvars; 1418 else 1419 cvars = &local->cvars[flow - fq->flows]; 1420 1421 return codel_dequeue(txqi, 1422 &flow->backlog, 1423 cparams, 1424 cvars, 1425 cstats, 1426 codel_skb_len_func, 1427 codel_skb_time_func, 1428 codel_drop_func, 1429 codel_dequeue_func); 1430 } 1431 1432 static void fq_skb_free_func(struct fq *fq, 1433 struct fq_tin *tin, 1434 struct fq_flow *flow, 1435 struct sk_buff *skb) 1436 { 1437 struct ieee80211_local *local; 1438 1439 local = container_of(fq, struct ieee80211_local, fq); 1440 ieee80211_free_txskb(&local->hw, skb); 1441 } 1442 1443 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1444 struct txq_info *txqi, 1445 struct sk_buff *skb) 1446 { 1447 struct fq *fq = &local->fq; 1448 struct fq_tin *tin = &txqi->tin; 1449 u32 flow_idx = fq_flow_idx(fq, skb); 1450 1451 ieee80211_set_skb_enqueue_time(skb); 1452 1453 spin_lock_bh(&fq->lock); 1454 /* 1455 * For management frames, don't really apply codel etc., 1456 * we don't want to apply any shaping or anything we just 1457 * want to simplify the driver API by having them on the 1458 * txqi. 1459 */ 1460 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1461 IEEE80211_SKB_CB(skb)->control.flags |= 1462 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1463 __skb_queue_tail(&txqi->frags, skb); 1464 } else { 1465 fq_tin_enqueue(fq, tin, flow_idx, skb, 1466 fq_skb_free_func); 1467 } 1468 spin_unlock_bh(&fq->lock); 1469 } 1470 1471 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1472 struct fq_flow *flow, struct sk_buff *skb, 1473 void *data) 1474 { 1475 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1476 1477 return info->control.vif == data; 1478 } 1479 1480 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1481 struct ieee80211_sub_if_data *sdata) 1482 { 1483 struct fq *fq = &local->fq; 1484 struct txq_info *txqi; 1485 struct fq_tin *tin; 1486 struct ieee80211_sub_if_data *ap; 1487 1488 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1489 return; 1490 1491 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1492 1493 if (!ap->vif.txq) 1494 return; 1495 1496 txqi = to_txq_info(ap->vif.txq); 1497 tin = &txqi->tin; 1498 1499 spin_lock_bh(&fq->lock); 1500 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1501 fq_skb_free_func); 1502 spin_unlock_bh(&fq->lock); 1503 } 1504 1505 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1506 struct sta_info *sta, 1507 struct txq_info *txqi, int tid) 1508 { 1509 fq_tin_init(&txqi->tin); 1510 codel_vars_init(&txqi->def_cvars); 1511 codel_stats_init(&txqi->cstats); 1512 __skb_queue_head_init(&txqi->frags); 1513 INIT_LIST_HEAD(&txqi->schedule_order); 1514 1515 txqi->txq.vif = &sdata->vif; 1516 1517 if (!sta) { 1518 sdata->vif.txq = &txqi->txq; 1519 txqi->txq.tid = 0; 1520 txqi->txq.ac = IEEE80211_AC_BE; 1521 1522 return; 1523 } 1524 1525 if (tid == IEEE80211_NUM_TIDS) { 1526 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1527 /* Drivers need to opt in to the management MPDU TXQ */ 1528 if (!ieee80211_hw_check(&sdata->local->hw, 1529 STA_MMPDU_TXQ)) 1530 return; 1531 } else if (!ieee80211_hw_check(&sdata->local->hw, 1532 BUFF_MMPDU_TXQ)) { 1533 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1534 return; 1535 } 1536 txqi->txq.ac = IEEE80211_AC_VO; 1537 } else { 1538 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1539 } 1540 1541 txqi->txq.sta = &sta->sta; 1542 txqi->txq.tid = tid; 1543 sta->sta.txq[tid] = &txqi->txq; 1544 } 1545 1546 void ieee80211_txq_purge(struct ieee80211_local *local, 1547 struct txq_info *txqi) 1548 { 1549 struct fq *fq = &local->fq; 1550 struct fq_tin *tin = &txqi->tin; 1551 1552 spin_lock_bh(&fq->lock); 1553 fq_tin_reset(fq, tin, fq_skb_free_func); 1554 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1555 spin_unlock_bh(&fq->lock); 1556 1557 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1558 list_del_init(&txqi->schedule_order); 1559 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1560 } 1561 1562 void ieee80211_txq_set_params(struct ieee80211_local *local) 1563 { 1564 if (local->hw.wiphy->txq_limit) 1565 local->fq.limit = local->hw.wiphy->txq_limit; 1566 else 1567 local->hw.wiphy->txq_limit = local->fq.limit; 1568 1569 if (local->hw.wiphy->txq_memory_limit) 1570 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1571 else 1572 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1573 1574 if (local->hw.wiphy->txq_quantum) 1575 local->fq.quantum = local->hw.wiphy->txq_quantum; 1576 else 1577 local->hw.wiphy->txq_quantum = local->fq.quantum; 1578 } 1579 1580 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1581 { 1582 struct fq *fq = &local->fq; 1583 int ret; 1584 int i; 1585 bool supp_vht = false; 1586 enum nl80211_band band; 1587 1588 ret = fq_init(fq, 4096); 1589 if (ret) 1590 return ret; 1591 1592 /* 1593 * If the hardware doesn't support VHT, it is safe to limit the maximum 1594 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1595 */ 1596 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1597 struct ieee80211_supported_band *sband; 1598 1599 sband = local->hw.wiphy->bands[band]; 1600 if (!sband) 1601 continue; 1602 1603 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1604 } 1605 1606 if (!supp_vht) 1607 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1608 1609 codel_params_init(&local->cparams); 1610 local->cparams.interval = MS2TIME(100); 1611 local->cparams.target = MS2TIME(20); 1612 local->cparams.ecn = true; 1613 1614 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1615 GFP_KERNEL); 1616 if (!local->cvars) { 1617 spin_lock_bh(&fq->lock); 1618 fq_reset(fq, fq_skb_free_func); 1619 spin_unlock_bh(&fq->lock); 1620 return -ENOMEM; 1621 } 1622 1623 for (i = 0; i < fq->flows_cnt; i++) 1624 codel_vars_init(&local->cvars[i]); 1625 1626 ieee80211_txq_set_params(local); 1627 1628 return 0; 1629 } 1630 1631 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1632 { 1633 struct fq *fq = &local->fq; 1634 1635 kfree(local->cvars); 1636 local->cvars = NULL; 1637 1638 spin_lock_bh(&fq->lock); 1639 fq_reset(fq, fq_skb_free_func); 1640 spin_unlock_bh(&fq->lock); 1641 } 1642 1643 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1644 struct ieee80211_sub_if_data *sdata, 1645 struct sta_info *sta, 1646 struct sk_buff *skb) 1647 { 1648 struct ieee80211_vif *vif; 1649 struct txq_info *txqi; 1650 1651 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1652 return false; 1653 1654 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1655 sdata = container_of(sdata->bss, 1656 struct ieee80211_sub_if_data, u.ap); 1657 1658 vif = &sdata->vif; 1659 txqi = ieee80211_get_txq(local, vif, sta, skb); 1660 1661 if (!txqi) 1662 return false; 1663 1664 ieee80211_txq_enqueue(local, txqi, skb); 1665 1666 schedule_and_wake_txq(local, txqi); 1667 1668 return true; 1669 } 1670 1671 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1672 struct ieee80211_vif *vif, 1673 struct sta_info *sta, 1674 struct sk_buff_head *skbs, 1675 bool txpending) 1676 { 1677 struct ieee80211_tx_control control = {}; 1678 struct sk_buff *skb, *tmp; 1679 unsigned long flags; 1680 1681 skb_queue_walk_safe(skbs, skb, tmp) { 1682 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1683 int q = info->hw_queue; 1684 1685 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1686 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1687 __skb_unlink(skb, skbs); 1688 ieee80211_free_txskb(&local->hw, skb); 1689 continue; 1690 } 1691 #endif 1692 1693 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1694 if (local->queue_stop_reasons[q] || 1695 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1696 if (unlikely(info->flags & 1697 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1698 if (local->queue_stop_reasons[q] & 1699 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1700 /* 1701 * Drop off-channel frames if queues 1702 * are stopped for any reason other 1703 * than off-channel operation. Never 1704 * queue them. 1705 */ 1706 spin_unlock_irqrestore( 1707 &local->queue_stop_reason_lock, 1708 flags); 1709 ieee80211_purge_tx_queue(&local->hw, 1710 skbs); 1711 return true; 1712 } 1713 } else { 1714 1715 /* 1716 * Since queue is stopped, queue up frames for 1717 * later transmission from the tx-pending 1718 * tasklet when the queue is woken again. 1719 */ 1720 if (txpending) 1721 skb_queue_splice_init(skbs, 1722 &local->pending[q]); 1723 else 1724 skb_queue_splice_tail_init(skbs, 1725 &local->pending[q]); 1726 1727 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1728 flags); 1729 return false; 1730 } 1731 } 1732 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1733 1734 info->control.vif = vif; 1735 control.sta = sta ? &sta->sta : NULL; 1736 1737 __skb_unlink(skb, skbs); 1738 drv_tx(local, &control, skb); 1739 } 1740 1741 return true; 1742 } 1743 1744 /* 1745 * Returns false if the frame couldn't be transmitted but was queued instead. 1746 */ 1747 static bool __ieee80211_tx(struct ieee80211_local *local, 1748 struct sk_buff_head *skbs, struct sta_info *sta, 1749 bool txpending) 1750 { 1751 struct ieee80211_tx_info *info; 1752 struct ieee80211_sub_if_data *sdata; 1753 struct ieee80211_vif *vif; 1754 struct sk_buff *skb; 1755 bool result; 1756 1757 if (WARN_ON(skb_queue_empty(skbs))) 1758 return true; 1759 1760 skb = skb_peek(skbs); 1761 info = IEEE80211_SKB_CB(skb); 1762 sdata = vif_to_sdata(info->control.vif); 1763 if (sta && !sta->uploaded) 1764 sta = NULL; 1765 1766 switch (sdata->vif.type) { 1767 case NL80211_IFTYPE_MONITOR: 1768 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1769 vif = &sdata->vif; 1770 break; 1771 } 1772 sdata = rcu_dereference(local->monitor_sdata); 1773 if (sdata) { 1774 vif = &sdata->vif; 1775 info->hw_queue = 1776 vif->hw_queue[skb_get_queue_mapping(skb)]; 1777 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1778 ieee80211_purge_tx_queue(&local->hw, skbs); 1779 return true; 1780 } else 1781 vif = NULL; 1782 break; 1783 case NL80211_IFTYPE_AP_VLAN: 1784 sdata = container_of(sdata->bss, 1785 struct ieee80211_sub_if_data, u.ap); 1786 fallthrough; 1787 default: 1788 vif = &sdata->vif; 1789 break; 1790 } 1791 1792 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1793 1794 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1795 1796 return result; 1797 } 1798 1799 /* 1800 * Invoke TX handlers, return 0 on success and non-zero if the 1801 * frame was dropped or queued. 1802 * 1803 * The handlers are split into an early and late part. The latter is everything 1804 * that can be sensitive to reordering, and will be deferred to after packets 1805 * are dequeued from the intermediate queues (when they are enabled). 1806 */ 1807 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1808 { 1809 ieee80211_tx_result res = TX_DROP; 1810 1811 #define CALL_TXH(txh) \ 1812 do { \ 1813 res = txh(tx); \ 1814 if (res != TX_CONTINUE) \ 1815 goto txh_done; \ 1816 } while (0) 1817 1818 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1819 CALL_TXH(ieee80211_tx_h_check_assoc); 1820 CALL_TXH(ieee80211_tx_h_ps_buf); 1821 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1822 CALL_TXH(ieee80211_tx_h_select_key); 1823 1824 txh_done: 1825 if (unlikely(res == TX_DROP)) { 1826 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1827 if (tx->skb) 1828 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1829 else 1830 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1831 return -1; 1832 } else if (unlikely(res == TX_QUEUED)) { 1833 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1834 return -1; 1835 } 1836 1837 return 0; 1838 } 1839 1840 /* 1841 * Late handlers can be called while the sta lock is held. Handlers that can 1842 * cause packets to be generated will cause deadlock! 1843 */ 1844 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1845 { 1846 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1847 ieee80211_tx_result res = TX_CONTINUE; 1848 1849 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1850 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1851 1852 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1853 __skb_queue_tail(&tx->skbs, tx->skb); 1854 tx->skb = NULL; 1855 goto txh_done; 1856 } 1857 1858 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1859 CALL_TXH(ieee80211_tx_h_sequence); 1860 CALL_TXH(ieee80211_tx_h_fragment); 1861 /* handlers after fragment must be aware of tx info fragmentation! */ 1862 CALL_TXH(ieee80211_tx_h_stats); 1863 CALL_TXH(ieee80211_tx_h_encrypt); 1864 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1865 CALL_TXH(ieee80211_tx_h_calculate_duration); 1866 #undef CALL_TXH 1867 1868 txh_done: 1869 if (unlikely(res == TX_DROP)) { 1870 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1871 if (tx->skb) 1872 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1873 else 1874 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1875 return -1; 1876 } else if (unlikely(res == TX_QUEUED)) { 1877 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1878 return -1; 1879 } 1880 1881 return 0; 1882 } 1883 1884 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1885 { 1886 int r = invoke_tx_handlers_early(tx); 1887 1888 if (r) 1889 return r; 1890 return invoke_tx_handlers_late(tx); 1891 } 1892 1893 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1894 struct ieee80211_vif *vif, struct sk_buff *skb, 1895 int band, struct ieee80211_sta **sta) 1896 { 1897 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1898 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1899 struct ieee80211_tx_data tx; 1900 struct sk_buff *skb2; 1901 1902 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1903 return false; 1904 1905 info->band = band; 1906 info->control.vif = vif; 1907 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1908 1909 if (invoke_tx_handlers(&tx)) 1910 return false; 1911 1912 if (sta) { 1913 if (tx.sta) 1914 *sta = &tx.sta->sta; 1915 else 1916 *sta = NULL; 1917 } 1918 1919 /* this function isn't suitable for fragmented data frames */ 1920 skb2 = __skb_dequeue(&tx.skbs); 1921 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1922 ieee80211_free_txskb(hw, skb2); 1923 ieee80211_purge_tx_queue(hw, &tx.skbs); 1924 return false; 1925 } 1926 1927 return true; 1928 } 1929 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1930 1931 /* 1932 * Returns false if the frame couldn't be transmitted but was queued instead. 1933 */ 1934 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1935 struct sta_info *sta, struct sk_buff *skb, 1936 bool txpending) 1937 { 1938 struct ieee80211_local *local = sdata->local; 1939 struct ieee80211_tx_data tx; 1940 ieee80211_tx_result res_prepare; 1941 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1942 bool result = true; 1943 1944 if (unlikely(skb->len < 10)) { 1945 dev_kfree_skb(skb); 1946 return true; 1947 } 1948 1949 /* initialises tx */ 1950 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1951 1952 if (unlikely(res_prepare == TX_DROP)) { 1953 ieee80211_free_txskb(&local->hw, skb); 1954 return true; 1955 } else if (unlikely(res_prepare == TX_QUEUED)) { 1956 return true; 1957 } 1958 1959 /* set up hw_queue value early */ 1960 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1961 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1962 info->hw_queue = 1963 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1964 1965 if (invoke_tx_handlers_early(&tx)) 1966 return true; 1967 1968 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1969 return true; 1970 1971 if (!invoke_tx_handlers_late(&tx)) 1972 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1973 1974 return result; 1975 } 1976 1977 /* device xmit handlers */ 1978 1979 enum ieee80211_encrypt { 1980 ENCRYPT_NO, 1981 ENCRYPT_MGMT, 1982 ENCRYPT_DATA, 1983 }; 1984 1985 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1986 struct sk_buff *skb, 1987 int head_need, 1988 enum ieee80211_encrypt encrypt) 1989 { 1990 struct ieee80211_local *local = sdata->local; 1991 bool enc_tailroom; 1992 int tail_need = 0; 1993 1994 enc_tailroom = encrypt == ENCRYPT_MGMT || 1995 (encrypt == ENCRYPT_DATA && 1996 sdata->crypto_tx_tailroom_needed_cnt); 1997 1998 if (enc_tailroom) { 1999 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2000 tail_need -= skb_tailroom(skb); 2001 tail_need = max_t(int, tail_need, 0); 2002 } 2003 2004 if (skb_cloned(skb) && 2005 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2006 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2007 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2008 else if (head_need || tail_need) 2009 I802_DEBUG_INC(local->tx_expand_skb_head); 2010 else 2011 return 0; 2012 2013 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2014 wiphy_debug(local->hw.wiphy, 2015 "failed to reallocate TX buffer\n"); 2016 return -ENOMEM; 2017 } 2018 2019 return 0; 2020 } 2021 2022 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2023 struct sta_info *sta, struct sk_buff *skb) 2024 { 2025 struct ieee80211_local *local = sdata->local; 2026 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2027 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2028 int headroom; 2029 enum ieee80211_encrypt encrypt; 2030 2031 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2032 encrypt = ENCRYPT_NO; 2033 else if (ieee80211_is_mgmt(hdr->frame_control)) 2034 encrypt = ENCRYPT_MGMT; 2035 else 2036 encrypt = ENCRYPT_DATA; 2037 2038 headroom = local->tx_headroom; 2039 if (encrypt != ENCRYPT_NO) 2040 headroom += IEEE80211_ENCRYPT_HEADROOM; 2041 headroom -= skb_headroom(skb); 2042 headroom = max_t(int, 0, headroom); 2043 2044 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2045 ieee80211_free_txskb(&local->hw, skb); 2046 return; 2047 } 2048 2049 /* reload after potential resize */ 2050 hdr = (struct ieee80211_hdr *) skb->data; 2051 info->control.vif = &sdata->vif; 2052 2053 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2054 if (ieee80211_is_data(hdr->frame_control) && 2055 is_unicast_ether_addr(hdr->addr1)) { 2056 if (mesh_nexthop_resolve(sdata, skb)) 2057 return; /* skb queued: don't free */ 2058 } else { 2059 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2060 } 2061 } 2062 2063 ieee80211_set_qos_hdr(sdata, skb); 2064 ieee80211_tx(sdata, sta, skb, false); 2065 } 2066 2067 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2068 { 2069 struct ieee80211_radiotap_header *rthdr = 2070 (struct ieee80211_radiotap_header *)skb->data; 2071 2072 /* check for not even having the fixed radiotap header part */ 2073 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2074 return false; /* too short to be possibly valid */ 2075 2076 /* is it a header version we can trust to find length from? */ 2077 if (unlikely(rthdr->it_version)) 2078 return false; /* only version 0 is supported */ 2079 2080 /* does the skb contain enough to deliver on the alleged length? */ 2081 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2082 return false; /* skb too short for claimed rt header extent */ 2083 2084 return true; 2085 } 2086 2087 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2088 struct net_device *dev) 2089 { 2090 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2091 struct ieee80211_radiotap_iterator iterator; 2092 struct ieee80211_radiotap_header *rthdr = 2093 (struct ieee80211_radiotap_header *) skb->data; 2094 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2095 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2096 NULL); 2097 u16 txflags; 2098 u16 rate = 0; 2099 bool rate_found = false; 2100 u8 rate_retries = 0; 2101 u16 rate_flags = 0; 2102 u8 mcs_known, mcs_flags, mcs_bw; 2103 u16 vht_known; 2104 u8 vht_mcs = 0, vht_nss = 0; 2105 int i; 2106 2107 if (!ieee80211_validate_radiotap_len(skb)) 2108 return false; 2109 2110 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2111 IEEE80211_TX_CTL_DONTFRAG; 2112 2113 /* 2114 * for every radiotap entry that is present 2115 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2116 * entries present, or -EINVAL on error) 2117 */ 2118 2119 while (!ret) { 2120 ret = ieee80211_radiotap_iterator_next(&iterator); 2121 2122 if (ret) 2123 continue; 2124 2125 /* see if this argument is something we can use */ 2126 switch (iterator.this_arg_index) { 2127 /* 2128 * You must take care when dereferencing iterator.this_arg 2129 * for multibyte types... the pointer is not aligned. Use 2130 * get_unaligned((type *)iterator.this_arg) to dereference 2131 * iterator.this_arg for type "type" safely on all arches. 2132 */ 2133 case IEEE80211_RADIOTAP_FLAGS: 2134 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2135 /* 2136 * this indicates that the skb we have been 2137 * handed has the 32-bit FCS CRC at the end... 2138 * we should react to that by snipping it off 2139 * because it will be recomputed and added 2140 * on transmission 2141 */ 2142 if (skb->len < (iterator._max_length + FCS_LEN)) 2143 return false; 2144 2145 skb_trim(skb, skb->len - FCS_LEN); 2146 } 2147 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2148 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2149 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2150 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2151 break; 2152 2153 case IEEE80211_RADIOTAP_TX_FLAGS: 2154 txflags = get_unaligned_le16(iterator.this_arg); 2155 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2156 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2157 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2158 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2159 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2160 info->control.flags |= 2161 IEEE80211_TX_CTRL_DONT_REORDER; 2162 break; 2163 2164 case IEEE80211_RADIOTAP_RATE: 2165 rate = *iterator.this_arg; 2166 rate_flags = 0; 2167 rate_found = true; 2168 break; 2169 2170 case IEEE80211_RADIOTAP_DATA_RETRIES: 2171 rate_retries = *iterator.this_arg; 2172 break; 2173 2174 case IEEE80211_RADIOTAP_MCS: 2175 mcs_known = iterator.this_arg[0]; 2176 mcs_flags = iterator.this_arg[1]; 2177 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2178 break; 2179 2180 rate_found = true; 2181 rate = iterator.this_arg[2]; 2182 rate_flags = IEEE80211_TX_RC_MCS; 2183 2184 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2185 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2186 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2187 2188 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2189 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2190 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2191 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2192 2193 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2194 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2195 info->flags |= IEEE80211_TX_CTL_LDPC; 2196 2197 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2198 u8 stbc = u8_get_bits(mcs_flags, 2199 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2200 2201 info->flags |= 2202 u32_encode_bits(stbc, 2203 IEEE80211_TX_CTL_STBC); 2204 } 2205 break; 2206 2207 case IEEE80211_RADIOTAP_VHT: 2208 vht_known = get_unaligned_le16(iterator.this_arg); 2209 rate_found = true; 2210 2211 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2212 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2213 (iterator.this_arg[2] & 2214 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2215 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2216 if (vht_known & 2217 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2218 if (iterator.this_arg[3] == 1) 2219 rate_flags |= 2220 IEEE80211_TX_RC_40_MHZ_WIDTH; 2221 else if (iterator.this_arg[3] == 4) 2222 rate_flags |= 2223 IEEE80211_TX_RC_80_MHZ_WIDTH; 2224 else if (iterator.this_arg[3] == 11) 2225 rate_flags |= 2226 IEEE80211_TX_RC_160_MHZ_WIDTH; 2227 } 2228 2229 vht_mcs = iterator.this_arg[4] >> 4; 2230 if (vht_mcs > 11) 2231 vht_mcs = 0; 2232 vht_nss = iterator.this_arg[4] & 0xF; 2233 if (!vht_nss || vht_nss > 8) 2234 vht_nss = 1; 2235 break; 2236 2237 /* 2238 * Please update the file 2239 * Documentation/networking/mac80211-injection.rst 2240 * when parsing new fields here. 2241 */ 2242 2243 default: 2244 break; 2245 } 2246 } 2247 2248 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2249 return false; 2250 2251 if (rate_found) { 2252 struct ieee80211_supported_band *sband = 2253 local->hw.wiphy->bands[info->band]; 2254 2255 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2256 2257 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2258 info->control.rates[i].idx = -1; 2259 info->control.rates[i].flags = 0; 2260 info->control.rates[i].count = 0; 2261 } 2262 2263 if (rate_flags & IEEE80211_TX_RC_MCS) { 2264 info->control.rates[0].idx = rate; 2265 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2266 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2267 vht_nss); 2268 } else if (sband) { 2269 for (i = 0; i < sband->n_bitrates; i++) { 2270 if (rate * 5 != sband->bitrates[i].bitrate) 2271 continue; 2272 2273 info->control.rates[0].idx = i; 2274 break; 2275 } 2276 } 2277 2278 if (info->control.rates[0].idx < 0) 2279 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2280 2281 info->control.rates[0].flags = rate_flags; 2282 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2283 local->hw.max_rate_tries); 2284 } 2285 2286 return true; 2287 } 2288 2289 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2290 struct net_device *dev) 2291 { 2292 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2293 struct ieee80211_chanctx_conf *chanctx_conf; 2294 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2295 struct ieee80211_hdr *hdr; 2296 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2297 struct cfg80211_chan_def *chandef; 2298 u16 len_rthdr; 2299 int hdrlen; 2300 2301 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2302 if (unlikely(!ieee80211_sdata_running(sdata))) 2303 goto fail; 2304 2305 memset(info, 0, sizeof(*info)); 2306 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2307 IEEE80211_TX_CTL_INJECTED; 2308 2309 /* Sanity-check the length of the radiotap header */ 2310 if (!ieee80211_validate_radiotap_len(skb)) 2311 goto fail; 2312 2313 /* we now know there is a radiotap header with a length we can use */ 2314 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2315 2316 /* 2317 * fix up the pointers accounting for the radiotap 2318 * header still being in there. We are being given 2319 * a precooked IEEE80211 header so no need for 2320 * normal processing 2321 */ 2322 skb_set_mac_header(skb, len_rthdr); 2323 /* 2324 * these are just fixed to the end of the rt area since we 2325 * don't have any better information and at this point, nobody cares 2326 */ 2327 skb_set_network_header(skb, len_rthdr); 2328 skb_set_transport_header(skb, len_rthdr); 2329 2330 if (skb->len < len_rthdr + 2) 2331 goto fail; 2332 2333 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2334 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2335 2336 if (skb->len < len_rthdr + hdrlen) 2337 goto fail; 2338 2339 /* 2340 * Initialize skb->protocol if the injected frame is a data frame 2341 * carrying a rfc1042 header 2342 */ 2343 if (ieee80211_is_data(hdr->frame_control) && 2344 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2345 u8 *payload = (u8 *)hdr + hdrlen; 2346 2347 if (ether_addr_equal(payload, rfc1042_header)) 2348 skb->protocol = cpu_to_be16((payload[6] << 8) | 2349 payload[7]); 2350 } 2351 2352 rcu_read_lock(); 2353 2354 /* 2355 * We process outgoing injected frames that have a local address 2356 * we handle as though they are non-injected frames. 2357 * This code here isn't entirely correct, the local MAC address 2358 * isn't always enough to find the interface to use; for proper 2359 * VLAN support we have an nl80211-based mechanism. 2360 * 2361 * This is necessary, for example, for old hostapd versions that 2362 * don't use nl80211-based management TX/RX. 2363 */ 2364 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2365 if (!ieee80211_sdata_running(tmp_sdata)) 2366 continue; 2367 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2368 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2369 continue; 2370 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2371 sdata = tmp_sdata; 2372 break; 2373 } 2374 } 2375 2376 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2377 if (!chanctx_conf) { 2378 tmp_sdata = rcu_dereference(local->monitor_sdata); 2379 if (tmp_sdata) 2380 chanctx_conf = 2381 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2382 } 2383 2384 if (chanctx_conf) 2385 chandef = &chanctx_conf->def; 2386 else if (!local->use_chanctx) 2387 chandef = &local->_oper_chandef; 2388 else 2389 goto fail_rcu; 2390 2391 /* 2392 * Frame injection is not allowed if beaconing is not allowed 2393 * or if we need radar detection. Beaconing is usually not allowed when 2394 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2395 * Passive scan is also used in world regulatory domains where 2396 * your country is not known and as such it should be treated as 2397 * NO TX unless the channel is explicitly allowed in which case 2398 * your current regulatory domain would not have the passive scan 2399 * flag. 2400 * 2401 * Since AP mode uses monitor interfaces to inject/TX management 2402 * frames we can make AP mode the exception to this rule once it 2403 * supports radar detection as its implementation can deal with 2404 * radar detection by itself. We can do that later by adding a 2405 * monitor flag interfaces used for AP support. 2406 */ 2407 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2408 sdata->vif.type)) 2409 goto fail_rcu; 2410 2411 info->band = chandef->chan->band; 2412 2413 /* Initialize skb->priority according to frame type and TID class, 2414 * with respect to the sub interface that the frame will actually 2415 * be transmitted on. If the DONT_REORDER flag is set, the original 2416 * skb-priority is preserved to assure frames injected with this 2417 * flag are not reordered relative to each other. 2418 */ 2419 ieee80211_select_queue_80211(sdata, skb, hdr); 2420 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2421 2422 /* 2423 * Process the radiotap header. This will now take into account the 2424 * selected chandef above to accurately set injection rates and 2425 * retransmissions. 2426 */ 2427 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2428 goto fail_rcu; 2429 2430 /* remove the injection radiotap header */ 2431 skb_pull(skb, len_rthdr); 2432 2433 ieee80211_xmit(sdata, NULL, skb); 2434 rcu_read_unlock(); 2435 2436 return NETDEV_TX_OK; 2437 2438 fail_rcu: 2439 rcu_read_unlock(); 2440 fail: 2441 dev_kfree_skb(skb); 2442 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2443 } 2444 2445 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2446 { 2447 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2448 2449 return ethertype == ETH_P_TDLS && 2450 skb->len > 14 && 2451 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2452 } 2453 2454 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2455 struct sk_buff *skb, 2456 struct sta_info **sta_out) 2457 { 2458 struct sta_info *sta; 2459 2460 switch (sdata->vif.type) { 2461 case NL80211_IFTYPE_AP_VLAN: 2462 sta = rcu_dereference(sdata->u.vlan.sta); 2463 if (sta) { 2464 *sta_out = sta; 2465 return 0; 2466 } else if (sdata->wdev.use_4addr) { 2467 return -ENOLINK; 2468 } 2469 fallthrough; 2470 case NL80211_IFTYPE_AP: 2471 case NL80211_IFTYPE_OCB: 2472 case NL80211_IFTYPE_ADHOC: 2473 if (is_multicast_ether_addr(skb->data)) { 2474 *sta_out = ERR_PTR(-ENOENT); 2475 return 0; 2476 } 2477 sta = sta_info_get_bss(sdata, skb->data); 2478 break; 2479 #ifdef CONFIG_MAC80211_MESH 2480 case NL80211_IFTYPE_MESH_POINT: 2481 /* determined much later */ 2482 *sta_out = NULL; 2483 return 0; 2484 #endif 2485 case NL80211_IFTYPE_STATION: 2486 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2487 sta = sta_info_get(sdata, skb->data); 2488 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2489 if (test_sta_flag(sta, 2490 WLAN_STA_TDLS_PEER_AUTH)) { 2491 *sta_out = sta; 2492 return 0; 2493 } 2494 2495 /* 2496 * TDLS link during setup - throw out frames to 2497 * peer. Allow TDLS-setup frames to unauthorized 2498 * peers for the special case of a link teardown 2499 * after a TDLS sta is removed due to being 2500 * unreachable. 2501 */ 2502 if (!ieee80211_is_tdls_setup(skb)) 2503 return -EINVAL; 2504 } 2505 2506 } 2507 2508 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2509 if (!sta) 2510 return -ENOLINK; 2511 break; 2512 default: 2513 return -EINVAL; 2514 } 2515 2516 *sta_out = sta ?: ERR_PTR(-ENOENT); 2517 return 0; 2518 } 2519 2520 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2521 struct sk_buff *skb, 2522 u32 *info_flags, 2523 u64 *cookie) 2524 { 2525 struct sk_buff *ack_skb; 2526 u16 info_id = 0; 2527 2528 if (skb->sk) 2529 ack_skb = skb_clone_sk(skb); 2530 else 2531 ack_skb = skb_clone(skb, GFP_ATOMIC); 2532 2533 if (ack_skb) { 2534 unsigned long flags; 2535 int id; 2536 2537 spin_lock_irqsave(&local->ack_status_lock, flags); 2538 id = idr_alloc(&local->ack_status_frames, ack_skb, 2539 1, 0x2000, GFP_ATOMIC); 2540 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2541 2542 if (id >= 0) { 2543 info_id = id; 2544 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2545 if (cookie) { 2546 *cookie = ieee80211_mgmt_tx_cookie(local); 2547 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2548 } 2549 } else { 2550 kfree_skb(ack_skb); 2551 } 2552 } 2553 2554 return info_id; 2555 } 2556 2557 /** 2558 * ieee80211_build_hdr - build 802.11 header in the given frame 2559 * @sdata: virtual interface to build the header for 2560 * @skb: the skb to build the header in 2561 * @info_flags: skb flags to set 2562 * @sta: the station pointer 2563 * @ctrl_flags: info control flags to set 2564 * @cookie: cookie pointer to fill (if not %NULL) 2565 * 2566 * This function takes the skb with 802.3 header and reformats the header to 2567 * the appropriate IEEE 802.11 header based on which interface the packet is 2568 * being transmitted on. 2569 * 2570 * Note that this function also takes care of the TX status request and 2571 * potential unsharing of the SKB - this needs to be interleaved with the 2572 * header building. 2573 * 2574 * The function requires the read-side RCU lock held 2575 * 2576 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2577 */ 2578 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2579 struct sk_buff *skb, u32 info_flags, 2580 struct sta_info *sta, u32 ctrl_flags, 2581 u64 *cookie) 2582 { 2583 struct ieee80211_local *local = sdata->local; 2584 struct ieee80211_tx_info *info; 2585 int head_need; 2586 u16 ethertype, hdrlen, meshhdrlen = 0; 2587 __le16 fc; 2588 struct ieee80211_hdr hdr; 2589 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2590 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2591 const u8 *encaps_data; 2592 int encaps_len, skip_header_bytes; 2593 bool wme_sta = false, authorized = false; 2594 bool tdls_peer; 2595 bool multicast; 2596 u16 info_id = 0; 2597 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2598 enum nl80211_band band; 2599 int ret; 2600 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2601 2602 if (IS_ERR(sta)) 2603 sta = NULL; 2604 2605 #ifdef CONFIG_MAC80211_DEBUGFS 2606 if (local->force_tx_status) 2607 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2608 #endif 2609 2610 /* convert Ethernet header to proper 802.11 header (based on 2611 * operation mode) */ 2612 ethertype = (skb->data[12] << 8) | skb->data[13]; 2613 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2614 2615 if (!ieee80211_vif_is_mld(&sdata->vif)) 2616 chanctx_conf = 2617 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2618 2619 switch (sdata->vif.type) { 2620 case NL80211_IFTYPE_AP_VLAN: 2621 if (sdata->wdev.use_4addr) { 2622 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2623 /* RA TA DA SA */ 2624 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2625 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2626 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2627 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2628 hdrlen = 30; 2629 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2630 wme_sta = sta->sta.wme; 2631 } 2632 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2633 struct ieee80211_sub_if_data *ap_sdata; 2634 2635 /* override chanctx_conf from AP (we don't have one) */ 2636 ap_sdata = container_of(sdata->bss, 2637 struct ieee80211_sub_if_data, 2638 u.ap); 2639 chanctx_conf = 2640 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2641 } 2642 if (sdata->wdev.use_4addr) 2643 break; 2644 fallthrough; 2645 case NL80211_IFTYPE_AP: 2646 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2647 /* DA BSSID SA */ 2648 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2649 2650 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2651 struct ieee80211_link_data *link; 2652 2653 link_id = sta->deflink.link_id; 2654 link = rcu_dereference(sdata->link[link_id]); 2655 if (WARN_ON(!link)) { 2656 ret = -ENOLINK; 2657 goto free; 2658 } 2659 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2660 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2661 (sta && sta->sta.mlo)) { 2662 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2663 } else { 2664 struct ieee80211_bss_conf *conf; 2665 2666 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2667 if (unlikely(!conf)) { 2668 ret = -ENOLINK; 2669 goto free; 2670 } 2671 2672 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2673 } 2674 2675 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2676 hdrlen = 24; 2677 break; 2678 #ifdef CONFIG_MAC80211_MESH 2679 case NL80211_IFTYPE_MESH_POINT: 2680 if (!is_multicast_ether_addr(skb->data)) { 2681 struct sta_info *next_hop; 2682 bool mpp_lookup = true; 2683 2684 mpath = mesh_path_lookup(sdata, skb->data); 2685 if (mpath) { 2686 mpp_lookup = false; 2687 next_hop = rcu_dereference(mpath->next_hop); 2688 if (!next_hop || 2689 !(mpath->flags & (MESH_PATH_ACTIVE | 2690 MESH_PATH_RESOLVING))) 2691 mpp_lookup = true; 2692 } 2693 2694 if (mpp_lookup) { 2695 mppath = mpp_path_lookup(sdata, skb->data); 2696 if (mppath) 2697 mppath->exp_time = jiffies; 2698 } 2699 2700 if (mppath && mpath) 2701 mesh_path_del(sdata, mpath->dst); 2702 } 2703 2704 /* 2705 * Use address extension if it is a packet from 2706 * another interface or if we know the destination 2707 * is being proxied by a portal (i.e. portal address 2708 * differs from proxied address) 2709 */ 2710 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2711 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2712 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2713 skb->data, skb->data + ETH_ALEN); 2714 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2715 NULL, NULL); 2716 } else { 2717 /* DS -> MBSS (802.11-2012 13.11.3.3). 2718 * For unicast with unknown forwarding information, 2719 * destination might be in the MBSS or if that fails 2720 * forwarded to another mesh gate. In either case 2721 * resolution will be handled in ieee80211_xmit(), so 2722 * leave the original DA. This also works for mcast */ 2723 const u8 *mesh_da = skb->data; 2724 2725 if (mppath) 2726 mesh_da = mppath->mpp; 2727 else if (mpath) 2728 mesh_da = mpath->dst; 2729 2730 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2731 mesh_da, sdata->vif.addr); 2732 if (is_multicast_ether_addr(mesh_da)) 2733 /* DA TA mSA AE:SA */ 2734 meshhdrlen = ieee80211_new_mesh_header( 2735 sdata, &mesh_hdr, 2736 skb->data + ETH_ALEN, NULL); 2737 else 2738 /* RA TA mDA mSA AE:DA SA */ 2739 meshhdrlen = ieee80211_new_mesh_header( 2740 sdata, &mesh_hdr, skb->data, 2741 skb->data + ETH_ALEN); 2742 2743 } 2744 2745 /* For injected frames, fill RA right away as nexthop lookup 2746 * will be skipped. 2747 */ 2748 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2749 is_zero_ether_addr(hdr.addr1)) 2750 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2751 break; 2752 #endif 2753 case NL80211_IFTYPE_STATION: 2754 /* we already did checks when looking up the RA STA */ 2755 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2756 2757 if (tdls_peer) { 2758 /* For TDLS only one link can be valid with peer STA */ 2759 int tdls_link_id = sta->sta.valid_links ? 2760 __ffs(sta->sta.valid_links) : 0; 2761 struct ieee80211_link_data *link; 2762 2763 /* DA SA BSSID */ 2764 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2765 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2766 link = rcu_dereference(sdata->link[tdls_link_id]); 2767 if (WARN_ON_ONCE(!link)) { 2768 ret = -EINVAL; 2769 goto free; 2770 } 2771 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2772 hdrlen = 24; 2773 } else if (sdata->u.mgd.use_4addr && 2774 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2775 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2776 IEEE80211_FCTL_TODS); 2777 /* RA TA DA SA */ 2778 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2779 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2780 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2781 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2782 hdrlen = 30; 2783 } else { 2784 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2785 /* BSSID SA DA */ 2786 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2787 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2788 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2789 hdrlen = 24; 2790 } 2791 break; 2792 case NL80211_IFTYPE_OCB: 2793 /* DA SA BSSID */ 2794 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2795 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2796 eth_broadcast_addr(hdr.addr3); 2797 hdrlen = 24; 2798 break; 2799 case NL80211_IFTYPE_ADHOC: 2800 /* DA SA BSSID */ 2801 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2802 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2803 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2804 hdrlen = 24; 2805 break; 2806 default: 2807 ret = -EINVAL; 2808 goto free; 2809 } 2810 2811 if (!chanctx_conf) { 2812 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2813 ret = -ENOTCONN; 2814 goto free; 2815 } 2816 /* MLD transmissions must not rely on the band */ 2817 band = 0; 2818 } else { 2819 band = chanctx_conf->def.chan->band; 2820 } 2821 2822 multicast = is_multicast_ether_addr(hdr.addr1); 2823 2824 /* sta is always NULL for mesh */ 2825 if (sta) { 2826 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2827 wme_sta = sta->sta.wme; 2828 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2829 /* For mesh, the use of the QoS header is mandatory */ 2830 wme_sta = true; 2831 } 2832 2833 /* receiver does QoS (which also means we do) use it */ 2834 if (wme_sta) { 2835 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2836 hdrlen += 2; 2837 } 2838 2839 /* 2840 * Drop unicast frames to unauthorised stations unless they are 2841 * EAPOL frames from the local station. 2842 */ 2843 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2844 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2845 !multicast && !authorized && 2846 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2847 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2848 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2849 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2850 sdata->name, hdr.addr1); 2851 #endif 2852 2853 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2854 2855 ret = -EPERM; 2856 goto free; 2857 } 2858 2859 if (unlikely(!multicast && ((skb->sk && 2860 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2861 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2862 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2863 cookie); 2864 2865 /* 2866 * If the skb is shared we need to obtain our own copy. 2867 */ 2868 skb = skb_share_check(skb, GFP_ATOMIC); 2869 if (unlikely(!skb)) { 2870 ret = -ENOMEM; 2871 goto free; 2872 } 2873 2874 hdr.frame_control = fc; 2875 hdr.duration_id = 0; 2876 hdr.seq_ctrl = 0; 2877 2878 skip_header_bytes = ETH_HLEN; 2879 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2880 encaps_data = bridge_tunnel_header; 2881 encaps_len = sizeof(bridge_tunnel_header); 2882 skip_header_bytes -= 2; 2883 } else if (ethertype >= ETH_P_802_3_MIN) { 2884 encaps_data = rfc1042_header; 2885 encaps_len = sizeof(rfc1042_header); 2886 skip_header_bytes -= 2; 2887 } else { 2888 encaps_data = NULL; 2889 encaps_len = 0; 2890 } 2891 2892 skb_pull(skb, skip_header_bytes); 2893 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2894 2895 /* 2896 * So we need to modify the skb header and hence need a copy of 2897 * that. The head_need variable above doesn't, so far, include 2898 * the needed header space that we don't need right away. If we 2899 * can, then we don't reallocate right now but only after the 2900 * frame arrives at the master device (if it does...) 2901 * 2902 * If we cannot, however, then we will reallocate to include all 2903 * the ever needed space. Also, if we need to reallocate it anyway, 2904 * make it big enough for everything we may ever need. 2905 */ 2906 2907 if (head_need > 0 || skb_cloned(skb)) { 2908 head_need += IEEE80211_ENCRYPT_HEADROOM; 2909 head_need += local->tx_headroom; 2910 head_need = max_t(int, 0, head_need); 2911 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2912 ieee80211_free_txskb(&local->hw, skb); 2913 skb = NULL; 2914 return ERR_PTR(-ENOMEM); 2915 } 2916 } 2917 2918 if (encaps_data) 2919 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2920 2921 #ifdef CONFIG_MAC80211_MESH 2922 if (meshhdrlen > 0) 2923 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2924 #endif 2925 2926 if (ieee80211_is_data_qos(fc)) { 2927 __le16 *qos_control; 2928 2929 qos_control = skb_push(skb, 2); 2930 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2931 /* 2932 * Maybe we could actually set some fields here, for now just 2933 * initialise to zero to indicate no special operation. 2934 */ 2935 *qos_control = 0; 2936 } else 2937 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2938 2939 skb_reset_mac_header(skb); 2940 2941 info = IEEE80211_SKB_CB(skb); 2942 memset(info, 0, sizeof(*info)); 2943 2944 info->flags = info_flags; 2945 info->ack_frame_id = info_id; 2946 info->band = band; 2947 2948 if (likely(!cookie)) { 2949 ctrl_flags |= u32_encode_bits(link_id, 2950 IEEE80211_TX_CTRL_MLO_LINK); 2951 } else { 2952 unsigned int pre_conf_link_id; 2953 2954 /* 2955 * ctrl_flags already have been set by 2956 * ieee80211_tx_control_port(), here 2957 * we just sanity check that 2958 */ 2959 2960 pre_conf_link_id = u32_get_bits(ctrl_flags, 2961 IEEE80211_TX_CTRL_MLO_LINK); 2962 2963 if (pre_conf_link_id != link_id && 2964 link_id != IEEE80211_LINK_UNSPECIFIED) { 2965 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2966 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2967 sdata->name, hdr.addr1, 2968 pre_conf_link_id, link_id); 2969 #endif 2970 ret = -EINVAL; 2971 goto free; 2972 } 2973 } 2974 2975 info->control.flags = ctrl_flags; 2976 2977 return skb; 2978 free: 2979 kfree_skb(skb); 2980 return ERR_PTR(ret); 2981 } 2982 2983 /* 2984 * fast-xmit overview 2985 * 2986 * The core idea of this fast-xmit is to remove per-packet checks by checking 2987 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2988 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2989 * much less work can be done per packet. For example, fragmentation must be 2990 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2991 * in the code here. 2992 * 2993 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2994 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2995 * 2996 * The most difficult part of this is that when any of these assumptions 2997 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2998 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2999 * since the per-packet code no longer checks the conditions. This is reflected 3000 * by the calls to these functions throughout the rest of the code, and must be 3001 * maintained if any of the TX path checks change. 3002 */ 3003 3004 void ieee80211_check_fast_xmit(struct sta_info *sta) 3005 { 3006 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3007 struct ieee80211_local *local = sta->local; 3008 struct ieee80211_sub_if_data *sdata = sta->sdata; 3009 struct ieee80211_hdr *hdr = (void *)build.hdr; 3010 struct ieee80211_chanctx_conf *chanctx_conf; 3011 __le16 fc; 3012 3013 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3014 return; 3015 3016 if (ieee80211_vif_is_mesh(&sdata->vif)) 3017 mesh_fast_tx_flush_sta(sdata, sta); 3018 3019 /* Locking here protects both the pointer itself, and against concurrent 3020 * invocations winning data access races to, e.g., the key pointer that 3021 * is used. 3022 * Without it, the invocation of this function right after the key 3023 * pointer changes wouldn't be sufficient, as another CPU could access 3024 * the pointer, then stall, and then do the cache update after the CPU 3025 * that invalidated the key. 3026 * With the locking, such scenarios cannot happen as the check for the 3027 * key and the fast-tx assignment are done atomically, so the CPU that 3028 * modifies the key will either wait or other one will see the key 3029 * cleared/changed already. 3030 */ 3031 spin_lock_bh(&sta->lock); 3032 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3033 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3034 sdata->vif.type == NL80211_IFTYPE_STATION) 3035 goto out; 3036 3037 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3038 goto out; 3039 3040 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3041 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3042 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3043 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3044 goto out; 3045 3046 if (sdata->noack_map) 3047 goto out; 3048 3049 /* fast-xmit doesn't handle fragmentation at all */ 3050 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3051 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3052 goto out; 3053 3054 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3055 rcu_read_lock(); 3056 chanctx_conf = 3057 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3058 if (!chanctx_conf) { 3059 rcu_read_unlock(); 3060 goto out; 3061 } 3062 build.band = chanctx_conf->def.chan->band; 3063 rcu_read_unlock(); 3064 } else { 3065 /* MLD transmissions must not rely on the band */ 3066 build.band = 0; 3067 } 3068 3069 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3070 3071 switch (sdata->vif.type) { 3072 case NL80211_IFTYPE_ADHOC: 3073 /* DA SA BSSID */ 3074 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3075 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3076 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3077 build.hdr_len = 24; 3078 break; 3079 case NL80211_IFTYPE_STATION: 3080 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3081 /* For TDLS only one link can be valid with peer STA */ 3082 int tdls_link_id = sta->sta.valid_links ? 3083 __ffs(sta->sta.valid_links) : 0; 3084 struct ieee80211_link_data *link; 3085 3086 /* DA SA BSSID */ 3087 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3088 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3089 rcu_read_lock(); 3090 link = rcu_dereference(sdata->link[tdls_link_id]); 3091 if (!WARN_ON_ONCE(!link)) 3092 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3093 rcu_read_unlock(); 3094 build.hdr_len = 24; 3095 break; 3096 } 3097 3098 if (sdata->u.mgd.use_4addr) { 3099 /* non-regular ethertype cannot use the fastpath */ 3100 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3101 IEEE80211_FCTL_TODS); 3102 /* RA TA DA SA */ 3103 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3104 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3105 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3106 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3107 build.hdr_len = 30; 3108 break; 3109 } 3110 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3111 /* BSSID SA DA */ 3112 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3113 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3114 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3115 build.hdr_len = 24; 3116 break; 3117 case NL80211_IFTYPE_AP_VLAN: 3118 if (sdata->wdev.use_4addr) { 3119 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3120 IEEE80211_FCTL_TODS); 3121 /* RA TA DA SA */ 3122 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3123 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3124 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3125 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3126 build.hdr_len = 30; 3127 break; 3128 } 3129 fallthrough; 3130 case NL80211_IFTYPE_AP: 3131 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3132 /* DA BSSID SA */ 3133 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3134 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3135 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3136 } else { 3137 unsigned int link_id = sta->deflink.link_id; 3138 struct ieee80211_link_data *link; 3139 3140 rcu_read_lock(); 3141 link = rcu_dereference(sdata->link[link_id]); 3142 if (WARN_ON(!link)) { 3143 rcu_read_unlock(); 3144 goto out; 3145 } 3146 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3147 rcu_read_unlock(); 3148 } 3149 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3150 build.hdr_len = 24; 3151 break; 3152 default: 3153 /* not handled on fast-xmit */ 3154 goto out; 3155 } 3156 3157 if (sta->sta.wme) { 3158 build.hdr_len += 2; 3159 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3160 } 3161 3162 /* We store the key here so there's no point in using rcu_dereference() 3163 * but that's fine because the code that changes the pointers will call 3164 * this function after doing so. For a single CPU that would be enough, 3165 * for multiple see the comment above. 3166 */ 3167 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3168 if (!build.key) 3169 build.key = rcu_access_pointer(sdata->default_unicast_key); 3170 if (build.key) { 3171 bool gen_iv, iv_spc, mmic; 3172 3173 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3174 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3175 mmic = build.key->conf.flags & 3176 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3177 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3178 3179 /* don't handle software crypto */ 3180 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3181 goto out; 3182 3183 /* Key is being removed */ 3184 if (build.key->flags & KEY_FLAG_TAINTED) 3185 goto out; 3186 3187 switch (build.key->conf.cipher) { 3188 case WLAN_CIPHER_SUITE_CCMP: 3189 case WLAN_CIPHER_SUITE_CCMP_256: 3190 if (gen_iv) 3191 build.pn_offs = build.hdr_len; 3192 if (gen_iv || iv_spc) 3193 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3194 break; 3195 case WLAN_CIPHER_SUITE_GCMP: 3196 case WLAN_CIPHER_SUITE_GCMP_256: 3197 if (gen_iv) 3198 build.pn_offs = build.hdr_len; 3199 if (gen_iv || iv_spc) 3200 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3201 break; 3202 case WLAN_CIPHER_SUITE_TKIP: 3203 /* cannot handle MMIC or IV generation in xmit-fast */ 3204 if (mmic || gen_iv) 3205 goto out; 3206 if (iv_spc) 3207 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3208 break; 3209 case WLAN_CIPHER_SUITE_WEP40: 3210 case WLAN_CIPHER_SUITE_WEP104: 3211 /* cannot handle IV generation in fast-xmit */ 3212 if (gen_iv) 3213 goto out; 3214 if (iv_spc) 3215 build.hdr_len += IEEE80211_WEP_IV_LEN; 3216 break; 3217 case WLAN_CIPHER_SUITE_AES_CMAC: 3218 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3219 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3220 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3221 WARN(1, 3222 "management cipher suite 0x%x enabled for data\n", 3223 build.key->conf.cipher); 3224 goto out; 3225 default: 3226 /* we don't know how to generate IVs for this at all */ 3227 if (WARN_ON(gen_iv)) 3228 goto out; 3229 } 3230 3231 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3232 } 3233 3234 hdr->frame_control = fc; 3235 3236 memcpy(build.hdr + build.hdr_len, 3237 rfc1042_header, sizeof(rfc1042_header)); 3238 build.hdr_len += sizeof(rfc1042_header); 3239 3240 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3241 /* if the kmemdup fails, continue w/o fast_tx */ 3242 3243 out: 3244 /* we might have raced against another call to this function */ 3245 old = rcu_dereference_protected(sta->fast_tx, 3246 lockdep_is_held(&sta->lock)); 3247 rcu_assign_pointer(sta->fast_tx, fast_tx); 3248 if (old) 3249 kfree_rcu(old, rcu_head); 3250 spin_unlock_bh(&sta->lock); 3251 } 3252 3253 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3254 { 3255 struct sta_info *sta; 3256 3257 rcu_read_lock(); 3258 list_for_each_entry_rcu(sta, &local->sta_list, list) 3259 ieee80211_check_fast_xmit(sta); 3260 rcu_read_unlock(); 3261 } 3262 3263 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3264 { 3265 struct ieee80211_local *local = sdata->local; 3266 struct sta_info *sta; 3267 3268 rcu_read_lock(); 3269 3270 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3271 if (sdata != sta->sdata && 3272 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3273 continue; 3274 ieee80211_check_fast_xmit(sta); 3275 } 3276 3277 rcu_read_unlock(); 3278 } 3279 3280 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3281 { 3282 struct ieee80211_fast_tx *fast_tx; 3283 3284 spin_lock_bh(&sta->lock); 3285 fast_tx = rcu_dereference_protected(sta->fast_tx, 3286 lockdep_is_held(&sta->lock)); 3287 RCU_INIT_POINTER(sta->fast_tx, NULL); 3288 spin_unlock_bh(&sta->lock); 3289 3290 if (fast_tx) 3291 kfree_rcu(fast_tx, rcu_head); 3292 } 3293 3294 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3295 struct sk_buff *skb, int headroom) 3296 { 3297 if (skb_headroom(skb) < headroom) { 3298 I802_DEBUG_INC(local->tx_expand_skb_head); 3299 3300 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3301 wiphy_debug(local->hw.wiphy, 3302 "failed to reallocate TX buffer\n"); 3303 return false; 3304 } 3305 } 3306 3307 return true; 3308 } 3309 3310 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3311 struct ieee80211_fast_tx *fast_tx, 3312 struct sk_buff *skb) 3313 { 3314 struct ieee80211_local *local = sdata->local; 3315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3316 struct ieee80211_hdr *hdr; 3317 struct ethhdr *amsdu_hdr; 3318 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3319 int subframe_len = skb->len - hdr_len; 3320 void *data; 3321 u8 *qc, *h_80211_src, *h_80211_dst; 3322 const u8 *bssid; 3323 3324 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3325 return false; 3326 3327 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3328 return true; 3329 3330 if (!ieee80211_amsdu_realloc_pad(local, skb, 3331 sizeof(*amsdu_hdr) + 3332 local->hw.extra_tx_headroom)) 3333 return false; 3334 3335 data = skb_push(skb, sizeof(*amsdu_hdr)); 3336 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3337 hdr = data; 3338 amsdu_hdr = data + hdr_len; 3339 /* h_80211_src/dst is addr* field within hdr */ 3340 h_80211_src = data + fast_tx->sa_offs; 3341 h_80211_dst = data + fast_tx->da_offs; 3342 3343 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3344 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3345 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3346 3347 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3348 * fields needs to be changed to BSSID for A-MSDU frames depending 3349 * on FromDS/ToDS values. 3350 */ 3351 switch (sdata->vif.type) { 3352 case NL80211_IFTYPE_STATION: 3353 bssid = sdata->vif.cfg.ap_addr; 3354 break; 3355 case NL80211_IFTYPE_AP: 3356 case NL80211_IFTYPE_AP_VLAN: 3357 bssid = sdata->vif.addr; 3358 break; 3359 default: 3360 bssid = NULL; 3361 } 3362 3363 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3364 ether_addr_copy(h_80211_src, bssid); 3365 3366 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3367 ether_addr_copy(h_80211_dst, bssid); 3368 3369 qc = ieee80211_get_qos_ctl(hdr); 3370 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3371 3372 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3373 3374 return true; 3375 } 3376 3377 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3378 struct sta_info *sta, 3379 struct ieee80211_fast_tx *fast_tx, 3380 struct sk_buff *skb, 3381 const u8 *da, const u8 *sa) 3382 { 3383 struct ieee80211_local *local = sdata->local; 3384 struct fq *fq = &local->fq; 3385 struct fq_tin *tin; 3386 struct fq_flow *flow; 3387 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3388 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3389 struct txq_info *txqi; 3390 struct sk_buff **frag_tail, *head; 3391 int subframe_len = skb->len - ETH_ALEN; 3392 u8 max_subframes = sta->sta.max_amsdu_subframes; 3393 int max_frags = local->hw.max_tx_fragments; 3394 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3395 int orig_truesize; 3396 u32 flow_idx; 3397 __be16 len; 3398 void *data; 3399 bool ret = false; 3400 unsigned int orig_len; 3401 int n = 2, nfrags, pad = 0; 3402 u16 hdrlen; 3403 3404 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3405 return false; 3406 3407 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3408 return false; 3409 3410 if (ieee80211_vif_is_mesh(&sdata->vif)) 3411 return false; 3412 3413 if (skb_is_gso(skb)) 3414 return false; 3415 3416 if (!txq) 3417 return false; 3418 3419 txqi = to_txq_info(txq); 3420 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3421 return false; 3422 3423 if (sta->sta.cur->max_rc_amsdu_len) 3424 max_amsdu_len = min_t(int, max_amsdu_len, 3425 sta->sta.cur->max_rc_amsdu_len); 3426 3427 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3428 max_amsdu_len = min_t(int, max_amsdu_len, 3429 sta->sta.cur->max_tid_amsdu_len[tid]); 3430 3431 flow_idx = fq_flow_idx(fq, skb); 3432 3433 spin_lock_bh(&fq->lock); 3434 3435 /* TODO: Ideally aggregation should be done on dequeue to remain 3436 * responsive to environment changes. 3437 */ 3438 3439 tin = &txqi->tin; 3440 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3441 head = skb_peek_tail(&flow->queue); 3442 if (!head || skb_is_gso(head)) 3443 goto out; 3444 3445 orig_truesize = head->truesize; 3446 orig_len = head->len; 3447 3448 if (skb->len + head->len > max_amsdu_len) 3449 goto out; 3450 3451 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3452 nfrags += 1 + skb_shinfo(head)->nr_frags; 3453 frag_tail = &skb_shinfo(head)->frag_list; 3454 while (*frag_tail) { 3455 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3456 frag_tail = &(*frag_tail)->next; 3457 n++; 3458 } 3459 3460 if (max_subframes && n > max_subframes) 3461 goto out; 3462 3463 if (max_frags && nfrags > max_frags) 3464 goto out; 3465 3466 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3467 goto out; 3468 3469 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3470 goto out; 3471 3472 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3473 * and frag_tail should be &skb_shinfo(head)->frag_list. 3474 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3475 * Reload frag_tail to have it pointing to the correct place. 3476 */ 3477 if (n == 2) 3478 frag_tail = &skb_shinfo(head)->frag_list; 3479 3480 /* 3481 * Pad out the previous subframe to a multiple of 4 by adding the 3482 * padding to the next one, that's being added. Note that head->len 3483 * is the length of the full A-MSDU, but that works since each time 3484 * we add a new subframe we pad out the previous one to a multiple 3485 * of 4 and thus it no longer matters in the next round. 3486 */ 3487 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3488 if ((head->len - hdrlen) & 3) 3489 pad = 4 - ((head->len - hdrlen) & 3); 3490 3491 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3492 2 + pad)) 3493 goto out_recalc; 3494 3495 ret = true; 3496 data = skb_push(skb, ETH_ALEN + 2); 3497 ether_addr_copy(data, da); 3498 ether_addr_copy(data + ETH_ALEN, sa); 3499 3500 data += 2 * ETH_ALEN; 3501 len = cpu_to_be16(subframe_len); 3502 memcpy(data, &len, 2); 3503 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3504 3505 memset(skb_push(skb, pad), 0, pad); 3506 3507 head->len += skb->len; 3508 head->data_len += skb->len; 3509 *frag_tail = skb; 3510 3511 out_recalc: 3512 fq->memory_usage += head->truesize - orig_truesize; 3513 if (head->len != orig_len) { 3514 flow->backlog += head->len - orig_len; 3515 tin->backlog_bytes += head->len - orig_len; 3516 } 3517 out: 3518 spin_unlock_bh(&fq->lock); 3519 3520 return ret; 3521 } 3522 3523 /* 3524 * Can be called while the sta lock is held. Anything that can cause packets to 3525 * be generated will cause deadlock! 3526 */ 3527 static ieee80211_tx_result 3528 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3529 struct sta_info *sta, u8 pn_offs, 3530 struct ieee80211_key *key, 3531 struct ieee80211_tx_data *tx) 3532 { 3533 struct sk_buff *skb = tx->skb; 3534 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3535 struct ieee80211_hdr *hdr = (void *)skb->data; 3536 u8 tid = IEEE80211_NUM_TIDS; 3537 3538 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3539 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3540 return TX_DROP; 3541 3542 if (key) 3543 info->control.hw_key = &key->conf; 3544 3545 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3546 3547 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3548 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3549 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3550 } else { 3551 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3552 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3553 sdata->sequence_number += 0x10; 3554 } 3555 3556 if (skb_shinfo(skb)->gso_size) 3557 sta->deflink.tx_stats.msdu[tid] += 3558 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3559 else 3560 sta->deflink.tx_stats.msdu[tid]++; 3561 3562 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3563 3564 /* statistics normally done by ieee80211_tx_h_stats (but that 3565 * has to consider fragmentation, so is more complex) 3566 */ 3567 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3568 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3569 3570 if (pn_offs) { 3571 u64 pn; 3572 u8 *crypto_hdr = skb->data + pn_offs; 3573 3574 switch (key->conf.cipher) { 3575 case WLAN_CIPHER_SUITE_CCMP: 3576 case WLAN_CIPHER_SUITE_CCMP_256: 3577 case WLAN_CIPHER_SUITE_GCMP: 3578 case WLAN_CIPHER_SUITE_GCMP_256: 3579 pn = atomic64_inc_return(&key->conf.tx_pn); 3580 crypto_hdr[0] = pn; 3581 crypto_hdr[1] = pn >> 8; 3582 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3583 crypto_hdr[4] = pn >> 16; 3584 crypto_hdr[5] = pn >> 24; 3585 crypto_hdr[6] = pn >> 32; 3586 crypto_hdr[7] = pn >> 40; 3587 break; 3588 } 3589 } 3590 3591 return TX_CONTINUE; 3592 } 3593 3594 static netdev_features_t 3595 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3596 { 3597 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3598 return sdata->vif.netdev_features; 3599 3600 if (!sdata->bss) 3601 return 0; 3602 3603 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3604 return sdata->vif.netdev_features; 3605 } 3606 3607 static struct sk_buff * 3608 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3609 { 3610 if (skb_is_gso(skb)) { 3611 struct sk_buff *segs; 3612 3613 segs = skb_gso_segment(skb, features); 3614 if (!segs) 3615 return skb; 3616 if (IS_ERR(segs)) 3617 goto free; 3618 3619 consume_skb(skb); 3620 return segs; 3621 } 3622 3623 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3624 goto free; 3625 3626 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3627 int ofs = skb_checksum_start_offset(skb); 3628 3629 if (skb->encapsulation) 3630 skb_set_inner_transport_header(skb, ofs); 3631 else 3632 skb_set_transport_header(skb, ofs); 3633 3634 if (skb_csum_hwoffload_help(skb, features)) 3635 goto free; 3636 } 3637 3638 skb_mark_not_on_list(skb); 3639 return skb; 3640 3641 free: 3642 kfree_skb(skb); 3643 return NULL; 3644 } 3645 3646 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3647 struct sta_info *sta, 3648 struct ieee80211_fast_tx *fast_tx, 3649 struct sk_buff *skb, bool ampdu, 3650 const u8 *da, const u8 *sa) 3651 { 3652 struct ieee80211_local *local = sdata->local; 3653 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3654 struct ieee80211_tx_info *info; 3655 struct ieee80211_tx_data tx; 3656 ieee80211_tx_result r; 3657 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3658 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3659 3660 skb = skb_share_check(skb, GFP_ATOMIC); 3661 if (unlikely(!skb)) 3662 return; 3663 3664 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3665 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3666 return; 3667 3668 /* will not be crypto-handled beyond what we do here, so use false 3669 * as the may-encrypt argument for the resize to not account for 3670 * more room than we already have in 'extra_head' 3671 */ 3672 if (unlikely(ieee80211_skb_resize(sdata, skb, 3673 max_t(int, extra_head + hw_headroom - 3674 skb_headroom(skb), 0), 3675 ENCRYPT_NO))) 3676 goto free; 3677 3678 hdr = skb_push(skb, extra_head); 3679 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3680 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3681 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3682 3683 info = IEEE80211_SKB_CB(skb); 3684 memset(info, 0, sizeof(*info)); 3685 info->band = fast_tx->band; 3686 info->control.vif = &sdata->vif; 3687 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3688 IEEE80211_TX_CTL_DONTFRAG; 3689 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3690 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3691 IEEE80211_TX_CTRL_MLO_LINK); 3692 3693 #ifdef CONFIG_MAC80211_DEBUGFS 3694 if (local->force_tx_status) 3695 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3696 #endif 3697 3698 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3699 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3700 3701 *ieee80211_get_qos_ctl(hdr) = tid; 3702 } 3703 3704 __skb_queue_head_init(&tx.skbs); 3705 3706 tx.flags = IEEE80211_TX_UNICAST; 3707 tx.local = local; 3708 tx.sdata = sdata; 3709 tx.sta = sta; 3710 tx.key = fast_tx->key; 3711 3712 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3713 return; 3714 3715 tx.skb = skb; 3716 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3717 fast_tx->key, &tx); 3718 tx.skb = NULL; 3719 if (r == TX_DROP) 3720 goto free; 3721 3722 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3723 sdata = container_of(sdata->bss, 3724 struct ieee80211_sub_if_data, u.ap); 3725 3726 __skb_queue_tail(&tx.skbs, skb); 3727 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3728 return; 3729 3730 free: 3731 kfree_skb(skb); 3732 } 3733 3734 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3735 struct sta_info *sta, 3736 struct ieee80211_fast_tx *fast_tx, 3737 struct sk_buff *skb) 3738 { 3739 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3740 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3741 struct tid_ampdu_tx *tid_tx = NULL; 3742 struct sk_buff *next; 3743 struct ethhdr eth; 3744 u8 tid = IEEE80211_NUM_TIDS; 3745 3746 /* control port protocol needs a lot of special handling */ 3747 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3748 return false; 3749 3750 /* only RFC 1042 SNAP */ 3751 if (ethertype < ETH_P_802_3_MIN) 3752 return false; 3753 3754 /* don't handle TX status request here either */ 3755 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3756 return false; 3757 3758 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3759 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3760 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3761 if (tid_tx) { 3762 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3763 return false; 3764 if (tid_tx->timeout) 3765 tid_tx->last_tx = jiffies; 3766 } 3767 } 3768 3769 memcpy(ð, skb->data, ETH_HLEN - 2); 3770 3771 /* after this point (skb is modified) we cannot return false */ 3772 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3773 if (!skb) 3774 return true; 3775 3776 skb_list_walk_safe(skb, skb, next) { 3777 skb_mark_not_on_list(skb); 3778 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3779 eth.h_dest, eth.h_source); 3780 } 3781 3782 return true; 3783 } 3784 3785 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3786 struct ieee80211_txq *txq) 3787 { 3788 struct ieee80211_local *local = hw_to_local(hw); 3789 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3790 struct ieee80211_hdr *hdr; 3791 struct sk_buff *skb = NULL; 3792 struct fq *fq = &local->fq; 3793 struct fq_tin *tin = &txqi->tin; 3794 struct ieee80211_tx_info *info; 3795 struct ieee80211_tx_data tx; 3796 ieee80211_tx_result r; 3797 struct ieee80211_vif *vif = txq->vif; 3798 int q = vif->hw_queue[txq->ac]; 3799 unsigned long flags; 3800 bool q_stopped; 3801 3802 WARN_ON_ONCE(softirq_count() == 0); 3803 3804 if (!ieee80211_txq_airtime_check(hw, txq)) 3805 return NULL; 3806 3807 begin: 3808 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3809 q_stopped = local->queue_stop_reasons[q]; 3810 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3811 3812 if (unlikely(q_stopped)) { 3813 /* mark for waking later */ 3814 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3815 return NULL; 3816 } 3817 3818 spin_lock_bh(&fq->lock); 3819 3820 /* Make sure fragments stay together. */ 3821 skb = __skb_dequeue(&txqi->frags); 3822 if (unlikely(skb)) { 3823 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3824 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3825 goto out; 3826 IEEE80211_SKB_CB(skb)->control.flags &= 3827 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3828 } else { 3829 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3830 goto out; 3831 3832 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3833 } 3834 3835 if (!skb) 3836 goto out; 3837 3838 spin_unlock_bh(&fq->lock); 3839 3840 hdr = (struct ieee80211_hdr *)skb->data; 3841 info = IEEE80211_SKB_CB(skb); 3842 3843 memset(&tx, 0, sizeof(tx)); 3844 __skb_queue_head_init(&tx.skbs); 3845 tx.local = local; 3846 tx.skb = skb; 3847 tx.sdata = vif_to_sdata(info->control.vif); 3848 3849 if (txq->sta) { 3850 tx.sta = container_of(txq->sta, struct sta_info, sta); 3851 /* 3852 * Drop unicast frames to unauthorised stations unless they are 3853 * injected frames or EAPOL frames from the local station. 3854 */ 3855 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3856 ieee80211_is_data(hdr->frame_control) && 3857 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3858 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3859 !is_multicast_ether_addr(hdr->addr1) && 3860 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3861 (!(info->control.flags & 3862 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3863 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3864 NULL)))) { 3865 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3866 ieee80211_free_txskb(&local->hw, skb); 3867 goto begin; 3868 } 3869 } 3870 3871 /* 3872 * The key can be removed while the packet was queued, so need to call 3873 * this here to get the current key. 3874 */ 3875 r = ieee80211_tx_h_select_key(&tx); 3876 if (r != TX_CONTINUE) { 3877 ieee80211_free_txskb(&local->hw, skb); 3878 goto begin; 3879 } 3880 3881 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3882 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3883 IEEE80211_TX_CTL_DONTFRAG); 3884 3885 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3886 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3887 r = ieee80211_tx_h_rate_ctrl(&tx); 3888 if (r != TX_CONTINUE) { 3889 ieee80211_free_txskb(&local->hw, skb); 3890 goto begin; 3891 } 3892 } 3893 goto encap_out; 3894 } 3895 3896 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3897 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3898 sta); 3899 u8 pn_offs = 0; 3900 3901 if (tx.key && 3902 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3903 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3904 3905 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3906 tx.key, &tx); 3907 if (r != TX_CONTINUE) { 3908 ieee80211_free_txskb(&local->hw, skb); 3909 goto begin; 3910 } 3911 } else { 3912 if (invoke_tx_handlers_late(&tx)) 3913 goto begin; 3914 3915 skb = __skb_dequeue(&tx.skbs); 3916 info = IEEE80211_SKB_CB(skb); 3917 3918 if (!skb_queue_empty(&tx.skbs)) { 3919 spin_lock_bh(&fq->lock); 3920 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3921 spin_unlock_bh(&fq->lock); 3922 } 3923 } 3924 3925 if (skb_has_frag_list(skb) && 3926 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3927 if (skb_linearize(skb)) { 3928 ieee80211_free_txskb(&local->hw, skb); 3929 goto begin; 3930 } 3931 } 3932 3933 switch (tx.sdata->vif.type) { 3934 case NL80211_IFTYPE_MONITOR: 3935 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3936 vif = &tx.sdata->vif; 3937 break; 3938 } 3939 tx.sdata = rcu_dereference(local->monitor_sdata); 3940 if (tx.sdata) { 3941 vif = &tx.sdata->vif; 3942 info->hw_queue = 3943 vif->hw_queue[skb_get_queue_mapping(skb)]; 3944 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3945 ieee80211_free_txskb(&local->hw, skb); 3946 goto begin; 3947 } else { 3948 vif = NULL; 3949 } 3950 break; 3951 case NL80211_IFTYPE_AP_VLAN: 3952 tx.sdata = container_of(tx.sdata->bss, 3953 struct ieee80211_sub_if_data, u.ap); 3954 fallthrough; 3955 default: 3956 vif = &tx.sdata->vif; 3957 break; 3958 } 3959 3960 encap_out: 3961 info->control.vif = vif; 3962 3963 if (tx.sta && 3964 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3965 bool ampdu = txq->ac != IEEE80211_AC_VO; 3966 u32 airtime; 3967 3968 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3969 skb->len, ampdu); 3970 if (airtime) { 3971 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3972 ieee80211_sta_update_pending_airtime(local, tx.sta, 3973 txq->ac, 3974 airtime, 3975 false); 3976 } 3977 } 3978 3979 return skb; 3980 3981 out: 3982 spin_unlock_bh(&fq->lock); 3983 3984 return skb; 3985 } 3986 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3987 3988 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3989 { 3990 struct airtime_info *air_info = &sta->airtime[ac]; 3991 3992 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3993 } 3994 3995 static void 3996 ieee80211_txq_set_active(struct txq_info *txqi) 3997 { 3998 struct sta_info *sta; 3999 4000 if (!txqi->txq.sta) 4001 return; 4002 4003 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4004 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 4005 } 4006 4007 static bool 4008 ieee80211_txq_keep_active(struct txq_info *txqi) 4009 { 4010 struct sta_info *sta; 4011 u32 diff; 4012 4013 if (!txqi->txq.sta) 4014 return false; 4015 4016 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4017 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4018 return false; 4019 4020 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 4021 4022 return diff <= AIRTIME_ACTIVE_DURATION; 4023 } 4024 4025 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4026 { 4027 struct ieee80211_local *local = hw_to_local(hw); 4028 struct ieee80211_txq *ret = NULL; 4029 struct txq_info *txqi = NULL, *head = NULL; 4030 bool found_eligible_txq = false; 4031 4032 spin_lock_bh(&local->active_txq_lock[ac]); 4033 4034 if (!local->schedule_round[ac]) 4035 goto out; 4036 4037 begin: 4038 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4039 struct txq_info, 4040 schedule_order); 4041 if (!txqi) 4042 goto out; 4043 4044 if (txqi == head) { 4045 if (!found_eligible_txq) 4046 goto out; 4047 else 4048 found_eligible_txq = false; 4049 } 4050 4051 if (!head) 4052 head = txqi; 4053 4054 if (txqi->txq.sta) { 4055 struct sta_info *sta = container_of(txqi->txq.sta, 4056 struct sta_info, sta); 4057 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4058 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4059 4060 if (aql_check) 4061 found_eligible_txq = true; 4062 4063 if (deficit < 0) 4064 sta->airtime[txqi->txq.ac].deficit += 4065 sta->airtime_weight; 4066 4067 if (deficit < 0 || !aql_check) { 4068 list_move_tail(&txqi->schedule_order, 4069 &local->active_txqs[txqi->txq.ac]); 4070 goto begin; 4071 } 4072 } 4073 4074 if (txqi->schedule_round == local->schedule_round[ac]) 4075 goto out; 4076 4077 list_del_init(&txqi->schedule_order); 4078 txqi->schedule_round = local->schedule_round[ac]; 4079 ret = &txqi->txq; 4080 4081 out: 4082 spin_unlock_bh(&local->active_txq_lock[ac]); 4083 return ret; 4084 } 4085 EXPORT_SYMBOL(ieee80211_next_txq); 4086 4087 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4088 struct ieee80211_txq *txq, 4089 bool force) 4090 { 4091 struct ieee80211_local *local = hw_to_local(hw); 4092 struct txq_info *txqi = to_txq_info(txq); 4093 bool has_queue; 4094 4095 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4096 4097 has_queue = force || txq_has_queue(txq); 4098 if (list_empty(&txqi->schedule_order) && 4099 (has_queue || ieee80211_txq_keep_active(txqi))) { 4100 /* If airtime accounting is active, always enqueue STAs at the 4101 * head of the list to ensure that they only get moved to the 4102 * back by the airtime DRR scheduler once they have a negative 4103 * deficit. A station that already has a negative deficit will 4104 * get immediately moved to the back of the list on the next 4105 * call to ieee80211_next_txq(). 4106 */ 4107 if (txqi->txq.sta && local->airtime_flags && has_queue && 4108 wiphy_ext_feature_isset(local->hw.wiphy, 4109 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4110 list_add(&txqi->schedule_order, 4111 &local->active_txqs[txq->ac]); 4112 else 4113 list_add_tail(&txqi->schedule_order, 4114 &local->active_txqs[txq->ac]); 4115 if (has_queue) 4116 ieee80211_txq_set_active(txqi); 4117 } 4118 4119 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4120 } 4121 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4122 4123 DEFINE_STATIC_KEY_FALSE(aql_disable); 4124 4125 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4126 struct ieee80211_txq *txq) 4127 { 4128 struct sta_info *sta; 4129 struct ieee80211_local *local = hw_to_local(hw); 4130 4131 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4132 return true; 4133 4134 if (static_branch_unlikely(&aql_disable)) 4135 return true; 4136 4137 if (!txq->sta) 4138 return true; 4139 4140 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4141 return true; 4142 4143 sta = container_of(txq->sta, struct sta_info, sta); 4144 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4145 sta->airtime[txq->ac].aql_limit_low) 4146 return true; 4147 4148 if (atomic_read(&local->aql_total_pending_airtime) < 4149 local->aql_threshold && 4150 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4151 sta->airtime[txq->ac].aql_limit_high) 4152 return true; 4153 4154 return false; 4155 } 4156 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4157 4158 static bool 4159 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4160 { 4161 unsigned int num_txq = 0; 4162 struct txq_info *txq; 4163 u32 aql_limit; 4164 4165 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4166 return true; 4167 4168 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4169 num_txq++; 4170 4171 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4172 local->aql_txq_limit_high[ac]; 4173 4174 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4175 } 4176 4177 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4178 struct ieee80211_txq *txq) 4179 { 4180 struct ieee80211_local *local = hw_to_local(hw); 4181 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4182 struct sta_info *sta; 4183 u8 ac = txq->ac; 4184 4185 spin_lock_bh(&local->active_txq_lock[ac]); 4186 4187 if (!txqi->txq.sta) 4188 goto out; 4189 4190 if (list_empty(&txqi->schedule_order)) 4191 goto out; 4192 4193 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4194 goto out; 4195 4196 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4197 schedule_order) { 4198 if (iter == txqi) 4199 break; 4200 4201 if (!iter->txq.sta) { 4202 list_move_tail(&iter->schedule_order, 4203 &local->active_txqs[ac]); 4204 continue; 4205 } 4206 sta = container_of(iter->txq.sta, struct sta_info, sta); 4207 if (ieee80211_sta_deficit(sta, ac) < 0) 4208 sta->airtime[ac].deficit += sta->airtime_weight; 4209 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4210 } 4211 4212 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4213 if (sta->airtime[ac].deficit >= 0) 4214 goto out; 4215 4216 sta->airtime[ac].deficit += sta->airtime_weight; 4217 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4218 spin_unlock_bh(&local->active_txq_lock[ac]); 4219 4220 return false; 4221 out: 4222 if (!list_empty(&txqi->schedule_order)) 4223 list_del_init(&txqi->schedule_order); 4224 spin_unlock_bh(&local->active_txq_lock[ac]); 4225 4226 return true; 4227 } 4228 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4229 4230 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4231 { 4232 struct ieee80211_local *local = hw_to_local(hw); 4233 4234 spin_lock_bh(&local->active_txq_lock[ac]); 4235 4236 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4237 local->schedule_round[ac]++; 4238 if (!local->schedule_round[ac]) 4239 local->schedule_round[ac]++; 4240 } else { 4241 local->schedule_round[ac] = 0; 4242 } 4243 4244 spin_unlock_bh(&local->active_txq_lock[ac]); 4245 } 4246 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4247 4248 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4249 struct net_device *dev, 4250 u32 info_flags, 4251 u32 ctrl_flags, 4252 u64 *cookie) 4253 { 4254 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4255 struct ieee80211_local *local = sdata->local; 4256 struct sta_info *sta; 4257 struct sk_buff *next; 4258 int len = skb->len; 4259 4260 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4261 kfree_skb(skb); 4262 return; 4263 } 4264 4265 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4266 4267 rcu_read_lock(); 4268 4269 if (ieee80211_vif_is_mesh(&sdata->vif) && 4270 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4271 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4272 goto out; 4273 4274 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4275 goto out_free; 4276 4277 if (IS_ERR(sta)) 4278 sta = NULL; 4279 4280 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4281 ieee80211_aggr_check(sdata, sta, skb); 4282 4283 if (sta) { 4284 struct ieee80211_fast_tx *fast_tx; 4285 4286 fast_tx = rcu_dereference(sta->fast_tx); 4287 4288 if (fast_tx && 4289 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4290 goto out; 4291 } 4292 4293 /* the frame could be fragmented, software-encrypted, and other 4294 * things so we cannot really handle checksum or GSO offload. 4295 * fix it up in software before we handle anything else. 4296 */ 4297 skb = ieee80211_tx_skb_fixup(skb, 0); 4298 if (!skb) { 4299 len = 0; 4300 goto out; 4301 } 4302 4303 skb_list_walk_safe(skb, skb, next) { 4304 skb_mark_not_on_list(skb); 4305 4306 if (skb->protocol == sdata->control_port_protocol) 4307 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4308 4309 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4310 sta, ctrl_flags, cookie); 4311 if (IS_ERR(skb)) { 4312 kfree_skb_list(next); 4313 goto out; 4314 } 4315 4316 dev_sw_netstats_tx_add(dev, 1, skb->len); 4317 4318 ieee80211_xmit(sdata, sta, skb); 4319 } 4320 goto out; 4321 out_free: 4322 kfree_skb(skb); 4323 len = 0; 4324 out: 4325 if (len) 4326 ieee80211_tpt_led_trig_tx(local, len); 4327 rcu_read_unlock(); 4328 } 4329 4330 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4331 { 4332 struct ethhdr *eth; 4333 int err; 4334 4335 err = skb_ensure_writable(skb, ETH_HLEN); 4336 if (unlikely(err)) 4337 return err; 4338 4339 eth = (void *)skb->data; 4340 ether_addr_copy(eth->h_dest, sta->sta.addr); 4341 4342 return 0; 4343 } 4344 4345 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4346 struct net_device *dev) 4347 { 4348 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4349 const struct ethhdr *eth = (void *)skb->data; 4350 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4351 __be16 ethertype; 4352 4353 switch (sdata->vif.type) { 4354 case NL80211_IFTYPE_AP_VLAN: 4355 if (sdata->u.vlan.sta) 4356 return false; 4357 if (sdata->wdev.use_4addr) 4358 return false; 4359 fallthrough; 4360 case NL80211_IFTYPE_AP: 4361 /* check runtime toggle for this bss */ 4362 if (!sdata->bss->multicast_to_unicast) 4363 return false; 4364 break; 4365 default: 4366 return false; 4367 } 4368 4369 /* multicast to unicast conversion only for some payload */ 4370 ethertype = eth->h_proto; 4371 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4372 ethertype = ethvlan->h_vlan_encapsulated_proto; 4373 switch (ethertype) { 4374 case htons(ETH_P_ARP): 4375 case htons(ETH_P_IP): 4376 case htons(ETH_P_IPV6): 4377 break; 4378 default: 4379 return false; 4380 } 4381 4382 return true; 4383 } 4384 4385 static void 4386 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4387 struct sk_buff_head *queue) 4388 { 4389 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4390 struct ieee80211_local *local = sdata->local; 4391 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4392 struct sta_info *sta, *first = NULL; 4393 struct sk_buff *cloned_skb; 4394 4395 rcu_read_lock(); 4396 4397 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4398 if (sdata != sta->sdata) 4399 /* AP-VLAN mismatch */ 4400 continue; 4401 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4402 /* do not send back to source */ 4403 continue; 4404 if (!first) { 4405 first = sta; 4406 continue; 4407 } 4408 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4409 if (!cloned_skb) 4410 goto multicast; 4411 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4412 dev_kfree_skb(cloned_skb); 4413 goto multicast; 4414 } 4415 __skb_queue_tail(queue, cloned_skb); 4416 } 4417 4418 if (likely(first)) { 4419 if (unlikely(ieee80211_change_da(skb, first))) 4420 goto multicast; 4421 __skb_queue_tail(queue, skb); 4422 } else { 4423 /* no STA connected, drop */ 4424 kfree_skb(skb); 4425 skb = NULL; 4426 } 4427 4428 goto out; 4429 multicast: 4430 __skb_queue_purge(queue); 4431 __skb_queue_tail(queue, skb); 4432 out: 4433 rcu_read_unlock(); 4434 } 4435 4436 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4437 struct sk_buff *skb, u32 ctrl_flags, 4438 unsigned int link_id) 4439 { 4440 struct sk_buff *out; 4441 4442 out = skb_copy(skb, GFP_ATOMIC); 4443 if (!out) 4444 return; 4445 4446 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4447 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4448 } 4449 4450 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4451 struct sk_buff *skb) 4452 { 4453 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4454 unsigned long links = sdata->vif.active_links; 4455 unsigned int link; 4456 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4457 4458 if (hweight16(links) == 1) { 4459 ctrl_flags |= u32_encode_bits(__ffs(links), 4460 IEEE80211_TX_CTRL_MLO_LINK); 4461 4462 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4463 NULL); 4464 return; 4465 } 4466 4467 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4468 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4469 ctrl_flags = 0; 4470 } 4471 kfree_skb(skb); 4472 } 4473 4474 /** 4475 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4476 * @skb: packet to be sent 4477 * @dev: incoming interface 4478 * 4479 * On failure skb will be freed. 4480 */ 4481 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4482 struct net_device *dev) 4483 { 4484 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4485 const struct ethhdr *eth = (void *)skb->data; 4486 4487 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4488 goto normal; 4489 4490 if (unlikely(!ieee80211_sdata_running(sdata))) { 4491 kfree_skb(skb); 4492 return NETDEV_TX_OK; 4493 } 4494 4495 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4496 struct sk_buff_head queue; 4497 4498 __skb_queue_head_init(&queue); 4499 ieee80211_convert_to_unicast(skb, dev, &queue); 4500 while ((skb = __skb_dequeue(&queue))) 4501 __ieee80211_subif_start_xmit(skb, dev, 0, 4502 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4503 NULL); 4504 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4505 sdata->vif.type == NL80211_IFTYPE_AP && 4506 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4507 ieee80211_mlo_multicast_tx(dev, skb); 4508 } else { 4509 normal: 4510 __ieee80211_subif_start_xmit(skb, dev, 0, 4511 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4512 NULL); 4513 } 4514 4515 return NETDEV_TX_OK; 4516 } 4517 4518 4519 4520 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4521 struct sk_buff *skb, struct sta_info *sta, 4522 bool txpending) 4523 { 4524 struct ieee80211_local *local = sdata->local; 4525 struct ieee80211_tx_control control = {}; 4526 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4527 struct ieee80211_sta *pubsta = NULL; 4528 unsigned long flags; 4529 int q = info->hw_queue; 4530 4531 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4532 4533 if (local->queue_stop_reasons[q] || 4534 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4535 if (txpending) 4536 skb_queue_head(&local->pending[q], skb); 4537 else 4538 skb_queue_tail(&local->pending[q], skb); 4539 4540 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4541 4542 return false; 4543 } 4544 4545 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4546 4547 if (sta && sta->uploaded) 4548 pubsta = &sta->sta; 4549 4550 control.sta = pubsta; 4551 4552 drv_tx(local, &control, skb); 4553 4554 return true; 4555 } 4556 4557 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4558 struct sk_buff *skb, struct sta_info *sta, 4559 bool txpending) 4560 { 4561 struct ieee80211_local *local = sdata->local; 4562 struct sk_buff *next; 4563 bool ret = true; 4564 4565 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4566 return true; 4567 4568 skb_list_walk_safe(skb, skb, next) { 4569 skb_mark_not_on_list(skb); 4570 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4571 ret = false; 4572 } 4573 4574 return ret; 4575 } 4576 4577 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4578 struct net_device *dev, struct sta_info *sta, 4579 struct ieee80211_key *key, struct sk_buff *skb) 4580 { 4581 struct ieee80211_tx_info *info; 4582 struct ieee80211_local *local = sdata->local; 4583 struct tid_ampdu_tx *tid_tx; 4584 struct sk_buff *seg, *next; 4585 unsigned int skbs = 0, len = 0; 4586 u16 queue; 4587 u8 tid; 4588 4589 queue = ieee80211_select_queue(sdata, sta, skb); 4590 skb_set_queue_mapping(skb, queue); 4591 4592 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4593 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4594 goto out_free; 4595 4596 skb = skb_share_check(skb, GFP_ATOMIC); 4597 if (unlikely(!skb)) 4598 return; 4599 4600 ieee80211_aggr_check(sdata, sta, skb); 4601 4602 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4603 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4604 if (tid_tx) { 4605 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4606 /* fall back to non-offload slow path */ 4607 __ieee80211_subif_start_xmit(skb, dev, 0, 4608 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4609 NULL); 4610 return; 4611 } 4612 4613 if (tid_tx->timeout) 4614 tid_tx->last_tx = jiffies; 4615 } 4616 4617 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4618 if (!skb) 4619 return; 4620 4621 info = IEEE80211_SKB_CB(skb); 4622 memset(info, 0, sizeof(*info)); 4623 4624 info->hw_queue = sdata->vif.hw_queue[queue]; 4625 4626 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4627 sdata = container_of(sdata->bss, 4628 struct ieee80211_sub_if_data, u.ap); 4629 4630 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4631 info->control.vif = &sdata->vif; 4632 4633 if (key) 4634 info->control.hw_key = &key->conf; 4635 4636 skb_list_walk_safe(skb, seg, next) { 4637 skbs++; 4638 len += seg->len; 4639 if (seg != skb) 4640 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4641 } 4642 4643 if (unlikely(skb->sk && 4644 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4645 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4646 &info->flags, NULL); 4647 4648 dev_sw_netstats_tx_add(dev, skbs, len); 4649 sta->deflink.tx_stats.packets[queue] += skbs; 4650 sta->deflink.tx_stats.bytes[queue] += len; 4651 4652 ieee80211_tpt_led_trig_tx(local, len); 4653 4654 ieee80211_tx_8023(sdata, skb, sta, false); 4655 4656 return; 4657 4658 out_free: 4659 kfree_skb(skb); 4660 } 4661 4662 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4663 struct net_device *dev) 4664 { 4665 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4666 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4667 struct ieee80211_key *key; 4668 struct sta_info *sta; 4669 4670 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4671 kfree_skb(skb); 4672 return NETDEV_TX_OK; 4673 } 4674 4675 rcu_read_lock(); 4676 4677 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4678 kfree_skb(skb); 4679 goto out; 4680 } 4681 4682 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4683 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4684 sdata->control_port_protocol == ehdr->h_proto)) 4685 goto skip_offload; 4686 4687 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4688 if (!key) 4689 key = rcu_dereference(sdata->default_unicast_key); 4690 4691 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4692 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4693 goto skip_offload; 4694 4695 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4696 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4697 goto out; 4698 4699 skip_offload: 4700 ieee80211_subif_start_xmit(skb, dev); 4701 out: 4702 rcu_read_unlock(); 4703 4704 return NETDEV_TX_OK; 4705 } 4706 4707 struct sk_buff * 4708 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4709 struct sk_buff *skb, u32 info_flags) 4710 { 4711 struct ieee80211_hdr *hdr; 4712 struct ieee80211_tx_data tx = { 4713 .local = sdata->local, 4714 .sdata = sdata, 4715 }; 4716 struct sta_info *sta; 4717 4718 rcu_read_lock(); 4719 4720 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4721 kfree_skb(skb); 4722 skb = ERR_PTR(-EINVAL); 4723 goto out; 4724 } 4725 4726 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4727 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4728 if (IS_ERR(skb)) 4729 goto out; 4730 4731 hdr = (void *)skb->data; 4732 tx.sta = sta_info_get(sdata, hdr->addr1); 4733 tx.skb = skb; 4734 4735 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4736 rcu_read_unlock(); 4737 kfree_skb(skb); 4738 return ERR_PTR(-EINVAL); 4739 } 4740 4741 out: 4742 rcu_read_unlock(); 4743 return skb; 4744 } 4745 4746 /* 4747 * ieee80211_clear_tx_pending may not be called in a context where 4748 * it is possible that it packets could come in again. 4749 */ 4750 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4751 { 4752 struct sk_buff *skb; 4753 int i; 4754 4755 for (i = 0; i < local->hw.queues; i++) { 4756 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4757 ieee80211_free_txskb(&local->hw, skb); 4758 } 4759 } 4760 4761 /* 4762 * Returns false if the frame couldn't be transmitted but was queued instead, 4763 * which in this case means re-queued -- take as an indication to stop sending 4764 * more pending frames. 4765 */ 4766 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4767 struct sk_buff *skb) 4768 { 4769 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4770 struct ieee80211_sub_if_data *sdata; 4771 struct sta_info *sta; 4772 struct ieee80211_hdr *hdr; 4773 bool result; 4774 struct ieee80211_chanctx_conf *chanctx_conf; 4775 4776 sdata = vif_to_sdata(info->control.vif); 4777 4778 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4779 /* update band only for non-MLD */ 4780 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4781 chanctx_conf = 4782 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4783 if (unlikely(!chanctx_conf)) { 4784 dev_kfree_skb(skb); 4785 return true; 4786 } 4787 info->band = chanctx_conf->def.chan->band; 4788 } 4789 result = ieee80211_tx(sdata, NULL, skb, true); 4790 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4791 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4792 dev_kfree_skb(skb); 4793 return true; 4794 } 4795 4796 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4797 sta = NULL; 4798 4799 result = ieee80211_tx_8023(sdata, skb, sta, true); 4800 } else { 4801 struct sk_buff_head skbs; 4802 4803 __skb_queue_head_init(&skbs); 4804 __skb_queue_tail(&skbs, skb); 4805 4806 hdr = (struct ieee80211_hdr *)skb->data; 4807 sta = sta_info_get(sdata, hdr->addr1); 4808 4809 result = __ieee80211_tx(local, &skbs, sta, true); 4810 } 4811 4812 return result; 4813 } 4814 4815 /* 4816 * Transmit all pending packets. Called from tasklet. 4817 */ 4818 void ieee80211_tx_pending(struct tasklet_struct *t) 4819 { 4820 struct ieee80211_local *local = from_tasklet(local, t, 4821 tx_pending_tasklet); 4822 unsigned long flags; 4823 int i; 4824 bool txok; 4825 4826 rcu_read_lock(); 4827 4828 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4829 for (i = 0; i < local->hw.queues; i++) { 4830 /* 4831 * If queue is stopped by something other than due to pending 4832 * frames, or we have no pending frames, proceed to next queue. 4833 */ 4834 if (local->queue_stop_reasons[i] || 4835 skb_queue_empty(&local->pending[i])) 4836 continue; 4837 4838 while (!skb_queue_empty(&local->pending[i])) { 4839 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4840 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4841 4842 if (WARN_ON(!info->control.vif)) { 4843 ieee80211_free_txskb(&local->hw, skb); 4844 continue; 4845 } 4846 4847 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4848 flags); 4849 4850 txok = ieee80211_tx_pending_skb(local, skb); 4851 spin_lock_irqsave(&local->queue_stop_reason_lock, 4852 flags); 4853 if (!txok) 4854 break; 4855 } 4856 } 4857 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4858 4859 rcu_read_unlock(); 4860 } 4861 4862 /* functions for drivers to get certain frames */ 4863 4864 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4865 struct ieee80211_link_data *link, 4866 struct ps_data *ps, struct sk_buff *skb, 4867 bool is_template) 4868 { 4869 u8 *pos, *tim; 4870 int aid0 = 0; 4871 int i, have_bits = 0, n1, n2; 4872 struct ieee80211_bss_conf *link_conf = link->conf; 4873 4874 /* Generate bitmap for TIM only if there are any STAs in power save 4875 * mode. */ 4876 if (atomic_read(&ps->num_sta_ps) > 0) 4877 /* in the hope that this is faster than 4878 * checking byte-for-byte */ 4879 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4880 IEEE80211_MAX_AID+1); 4881 if (!is_template) { 4882 if (ps->dtim_count == 0) 4883 ps->dtim_count = link_conf->dtim_period - 1; 4884 else 4885 ps->dtim_count--; 4886 } 4887 4888 tim = pos = skb_put(skb, 5); 4889 *pos++ = WLAN_EID_TIM; 4890 *pos++ = 3; 4891 *pos++ = ps->dtim_count; 4892 *pos++ = link_conf->dtim_period; 4893 4894 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4895 aid0 = 1; 4896 4897 ps->dtim_bc_mc = aid0 == 1; 4898 4899 if (have_bits) { 4900 /* Find largest even number N1 so that bits numbered 1 through 4901 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4902 * (N2 + 1) x 8 through 2007 are 0. */ 4903 n1 = 0; 4904 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4905 if (ps->tim[i]) { 4906 n1 = i & 0xfe; 4907 break; 4908 } 4909 } 4910 n2 = n1; 4911 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4912 if (ps->tim[i]) { 4913 n2 = i; 4914 break; 4915 } 4916 } 4917 4918 /* Bitmap control */ 4919 *pos++ = n1 | aid0; 4920 /* Part Virt Bitmap */ 4921 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4922 4923 tim[1] = n2 - n1 + 4; 4924 } else { 4925 *pos++ = aid0; /* Bitmap control */ 4926 4927 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4928 tim[1] = 4; 4929 /* Part Virt Bitmap */ 4930 skb_put_u8(skb, 0); 4931 } 4932 } 4933 } 4934 4935 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4936 struct ieee80211_link_data *link, 4937 struct ps_data *ps, struct sk_buff *skb, 4938 bool is_template) 4939 { 4940 struct ieee80211_local *local = sdata->local; 4941 4942 /* 4943 * Not very nice, but we want to allow the driver to call 4944 * ieee80211_beacon_get() as a response to the set_tim() 4945 * callback. That, however, is already invoked under the 4946 * sta_lock to guarantee consistent and race-free update 4947 * of the tim bitmap in mac80211 and the driver. 4948 */ 4949 if (local->tim_in_locked_section) { 4950 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4951 } else { 4952 spin_lock_bh(&local->tim_lock); 4953 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4954 spin_unlock_bh(&local->tim_lock); 4955 } 4956 4957 return 0; 4958 } 4959 4960 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4961 struct beacon_data *beacon, 4962 struct ieee80211_link_data *link) 4963 { 4964 u8 *beacon_data, count, max_count = 1; 4965 struct probe_resp *resp; 4966 size_t beacon_data_len; 4967 u16 *bcn_offsets; 4968 int i; 4969 4970 switch (sdata->vif.type) { 4971 case NL80211_IFTYPE_AP: 4972 beacon_data = beacon->tail; 4973 beacon_data_len = beacon->tail_len; 4974 break; 4975 case NL80211_IFTYPE_ADHOC: 4976 beacon_data = beacon->head; 4977 beacon_data_len = beacon->head_len; 4978 break; 4979 case NL80211_IFTYPE_MESH_POINT: 4980 beacon_data = beacon->head; 4981 beacon_data_len = beacon->head_len; 4982 break; 4983 default: 4984 return; 4985 } 4986 4987 resp = rcu_dereference(link->u.ap.probe_resp); 4988 4989 bcn_offsets = beacon->cntdwn_counter_offsets; 4990 count = beacon->cntdwn_current_counter; 4991 if (link->conf->csa_active) 4992 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4993 4994 for (i = 0; i < max_count; ++i) { 4995 if (bcn_offsets[i]) { 4996 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 4997 return; 4998 beacon_data[bcn_offsets[i]] = count; 4999 } 5000 5001 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5002 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5003 5004 resp->data[resp_offsets[i]] = count; 5005 } 5006 } 5007 } 5008 5009 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 5010 { 5011 beacon->cntdwn_current_counter--; 5012 5013 /* the counter should never reach 0 */ 5014 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 5015 5016 return beacon->cntdwn_current_counter; 5017 } 5018 5019 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 5020 { 5021 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5022 struct beacon_data *beacon = NULL; 5023 u8 count = 0; 5024 5025 rcu_read_lock(); 5026 5027 if (sdata->vif.type == NL80211_IFTYPE_AP) 5028 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5029 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5030 beacon = rcu_dereference(sdata->u.ibss.presp); 5031 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5032 beacon = rcu_dereference(sdata->u.mesh.beacon); 5033 5034 if (!beacon) 5035 goto unlock; 5036 5037 count = __ieee80211_beacon_update_cntdwn(beacon); 5038 5039 unlock: 5040 rcu_read_unlock(); 5041 return count; 5042 } 5043 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5044 5045 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5046 { 5047 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5048 struct beacon_data *beacon = NULL; 5049 5050 rcu_read_lock(); 5051 5052 if (sdata->vif.type == NL80211_IFTYPE_AP) 5053 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5054 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5055 beacon = rcu_dereference(sdata->u.ibss.presp); 5056 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5057 beacon = rcu_dereference(sdata->u.mesh.beacon); 5058 5059 if (!beacon) 5060 goto unlock; 5061 5062 if (counter < beacon->cntdwn_current_counter) 5063 beacon->cntdwn_current_counter = counter; 5064 5065 unlock: 5066 rcu_read_unlock(); 5067 } 5068 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5069 5070 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 5071 { 5072 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5073 struct beacon_data *beacon = NULL; 5074 u8 *beacon_data; 5075 size_t beacon_data_len; 5076 int ret = false; 5077 5078 if (!ieee80211_sdata_running(sdata)) 5079 return false; 5080 5081 rcu_read_lock(); 5082 if (vif->type == NL80211_IFTYPE_AP) { 5083 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5084 if (WARN_ON(!beacon || !beacon->tail)) 5085 goto out; 5086 beacon_data = beacon->tail; 5087 beacon_data_len = beacon->tail_len; 5088 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5089 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5090 5091 beacon = rcu_dereference(ifibss->presp); 5092 if (!beacon) 5093 goto out; 5094 5095 beacon_data = beacon->head; 5096 beacon_data_len = beacon->head_len; 5097 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5098 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5099 5100 beacon = rcu_dereference(ifmsh->beacon); 5101 if (!beacon) 5102 goto out; 5103 5104 beacon_data = beacon->head; 5105 beacon_data_len = beacon->head_len; 5106 } else { 5107 WARN_ON(1); 5108 goto out; 5109 } 5110 5111 if (!beacon->cntdwn_counter_offsets[0]) 5112 goto out; 5113 5114 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5115 goto out; 5116 5117 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5118 ret = true; 5119 5120 out: 5121 rcu_read_unlock(); 5122 5123 return ret; 5124 } 5125 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5126 5127 static int ieee80211_beacon_protect(struct sk_buff *skb, 5128 struct ieee80211_local *local, 5129 struct ieee80211_sub_if_data *sdata, 5130 struct ieee80211_link_data *link) 5131 { 5132 ieee80211_tx_result res; 5133 struct ieee80211_tx_data tx; 5134 struct sk_buff *check_skb; 5135 5136 memset(&tx, 0, sizeof(tx)); 5137 tx.key = rcu_dereference(link->default_beacon_key); 5138 if (!tx.key) 5139 return 0; 5140 5141 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5142 tx.key = NULL; 5143 return -EINVAL; 5144 } 5145 5146 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5147 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5148 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5149 5150 tx.local = local; 5151 tx.sdata = sdata; 5152 __skb_queue_head_init(&tx.skbs); 5153 __skb_queue_tail(&tx.skbs, skb); 5154 res = ieee80211_tx_h_encrypt(&tx); 5155 check_skb = __skb_dequeue(&tx.skbs); 5156 /* we may crash after this, but it'd be a bug in crypto */ 5157 WARN_ON(check_skb != skb); 5158 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5159 return -EINVAL; 5160 5161 return 0; 5162 } 5163 5164 static void 5165 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5166 struct ieee80211_vif *vif, 5167 struct ieee80211_link_data *link, 5168 struct ieee80211_mutable_offsets *offs, 5169 struct beacon_data *beacon, 5170 struct sk_buff *skb, 5171 struct ieee80211_chanctx_conf *chanctx_conf, 5172 u16 csa_off_base) 5173 { 5174 struct ieee80211_local *local = hw_to_local(hw); 5175 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5176 struct ieee80211_tx_info *info; 5177 enum nl80211_band band; 5178 struct ieee80211_tx_rate_control txrc; 5179 5180 /* CSA offsets */ 5181 if (offs && beacon) { 5182 u16 i; 5183 5184 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5185 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5186 5187 if (!csa_off) 5188 continue; 5189 5190 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5191 } 5192 } 5193 5194 band = chanctx_conf->def.chan->band; 5195 info = IEEE80211_SKB_CB(skb); 5196 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5197 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5198 info->band = band; 5199 5200 memset(&txrc, 0, sizeof(txrc)); 5201 txrc.hw = hw; 5202 txrc.sband = local->hw.wiphy->bands[band]; 5203 txrc.bss_conf = link->conf; 5204 txrc.skb = skb; 5205 txrc.reported_rate.idx = -1; 5206 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5207 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5208 else 5209 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5210 txrc.bss = true; 5211 rate_control_get_rate(sdata, NULL, &txrc); 5212 5213 info->control.vif = vif; 5214 info->control.flags |= u32_encode_bits(link->link_id, 5215 IEEE80211_TX_CTRL_MLO_LINK); 5216 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5217 IEEE80211_TX_CTL_ASSIGN_SEQ | 5218 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5219 } 5220 5221 static void 5222 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5223 u8 i) 5224 { 5225 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5226 i > beacon->mbssid_ies->cnt) 5227 return; 5228 5229 if (i < beacon->mbssid_ies->cnt) { 5230 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5231 beacon->mbssid_ies->elem[i].len); 5232 5233 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5234 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5235 beacon->rnr_ies->elem[i].len); 5236 5237 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5238 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5239 beacon->rnr_ies->elem[i].len); 5240 } 5241 return; 5242 } 5243 5244 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5245 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5246 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5247 beacon->mbssid_ies->elem[i].len); 5248 } 5249 5250 static struct sk_buff * 5251 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5252 struct ieee80211_vif *vif, 5253 struct ieee80211_link_data *link, 5254 struct ieee80211_mutable_offsets *offs, 5255 bool is_template, 5256 struct beacon_data *beacon, 5257 struct ieee80211_chanctx_conf *chanctx_conf, 5258 u8 ema_index) 5259 { 5260 struct ieee80211_local *local = hw_to_local(hw); 5261 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5262 struct ieee80211_if_ap *ap = &sdata->u.ap; 5263 struct sk_buff *skb = NULL; 5264 u16 csa_off_base = 0; 5265 int mbssid_len; 5266 5267 if (beacon->cntdwn_counter_offsets[0]) { 5268 if (!is_template) 5269 ieee80211_beacon_update_cntdwn(vif); 5270 5271 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5272 } 5273 5274 /* headroom, head length, 5275 * tail length, maximum TIM length and multiple BSSID length 5276 */ 5277 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5278 beacon->rnr_ies, 5279 ema_index); 5280 5281 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5282 beacon->tail_len + 256 + 5283 local->hw.extra_beacon_tailroom + mbssid_len); 5284 if (!skb) 5285 return NULL; 5286 5287 skb_reserve(skb, local->tx_headroom); 5288 skb_put_data(skb, beacon->head, beacon->head_len); 5289 5290 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5291 5292 if (offs) { 5293 offs->tim_offset = beacon->head_len; 5294 offs->tim_length = skb->len - beacon->head_len; 5295 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5296 5297 if (mbssid_len) { 5298 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5299 offs->mbssid_off = skb->len - mbssid_len; 5300 } 5301 5302 /* for AP the csa offsets are from tail */ 5303 csa_off_base = skb->len; 5304 } 5305 5306 if (beacon->tail) 5307 skb_put_data(skb, beacon->tail, beacon->tail_len); 5308 5309 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5310 return NULL; 5311 5312 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5313 chanctx_conf, csa_off_base); 5314 return skb; 5315 } 5316 5317 static struct ieee80211_ema_beacons * 5318 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5319 struct ieee80211_vif *vif, 5320 struct ieee80211_link_data *link, 5321 struct ieee80211_mutable_offsets *offs, 5322 bool is_template, struct beacon_data *beacon, 5323 struct ieee80211_chanctx_conf *chanctx_conf) 5324 { 5325 struct ieee80211_ema_beacons *ema = NULL; 5326 5327 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5328 return NULL; 5329 5330 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5331 GFP_ATOMIC); 5332 if (!ema) 5333 return NULL; 5334 5335 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5336 ema->bcn[ema->cnt].skb = 5337 ieee80211_beacon_get_ap(hw, vif, link, 5338 &ema->bcn[ema->cnt].offs, 5339 is_template, beacon, 5340 chanctx_conf, ema->cnt); 5341 if (!ema->bcn[ema->cnt].skb) 5342 break; 5343 } 5344 5345 if (ema->cnt == beacon->mbssid_ies->cnt) 5346 return ema; 5347 5348 ieee80211_beacon_free_ema_list(ema); 5349 return NULL; 5350 } 5351 5352 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5353 5354 static struct sk_buff * 5355 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5356 struct ieee80211_vif *vif, 5357 struct ieee80211_mutable_offsets *offs, 5358 bool is_template, 5359 unsigned int link_id, 5360 int ema_index, 5361 struct ieee80211_ema_beacons **ema_beacons) 5362 { 5363 struct ieee80211_local *local = hw_to_local(hw); 5364 struct beacon_data *beacon = NULL; 5365 struct sk_buff *skb = NULL; 5366 struct ieee80211_sub_if_data *sdata = NULL; 5367 struct ieee80211_chanctx_conf *chanctx_conf; 5368 struct ieee80211_link_data *link; 5369 5370 rcu_read_lock(); 5371 5372 sdata = vif_to_sdata(vif); 5373 link = rcu_dereference(sdata->link[link_id]); 5374 if (!link) 5375 goto out; 5376 chanctx_conf = 5377 rcu_dereference(link->conf->chanctx_conf); 5378 5379 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5380 goto out; 5381 5382 if (offs) 5383 memset(offs, 0, sizeof(*offs)); 5384 5385 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5386 beacon = rcu_dereference(link->u.ap.beacon); 5387 if (!beacon) 5388 goto out; 5389 5390 if (ema_beacons) { 5391 *ema_beacons = 5392 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5393 offs, 5394 is_template, 5395 beacon, 5396 chanctx_conf); 5397 } else { 5398 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5399 if (ema_index >= beacon->mbssid_ies->cnt) 5400 goto out; /* End of MBSSID elements */ 5401 5402 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5403 ema_index = beacon->mbssid_ies->cnt; 5404 } else { 5405 ema_index = 0; 5406 } 5407 5408 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5409 is_template, beacon, 5410 chanctx_conf, 5411 ema_index); 5412 } 5413 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5414 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5415 struct ieee80211_hdr *hdr; 5416 5417 beacon = rcu_dereference(ifibss->presp); 5418 if (!beacon) 5419 goto out; 5420 5421 if (beacon->cntdwn_counter_offsets[0]) { 5422 if (!is_template) 5423 __ieee80211_beacon_update_cntdwn(beacon); 5424 5425 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5426 } 5427 5428 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5429 local->hw.extra_beacon_tailroom); 5430 if (!skb) 5431 goto out; 5432 skb_reserve(skb, local->tx_headroom); 5433 skb_put_data(skb, beacon->head, beacon->head_len); 5434 5435 hdr = (struct ieee80211_hdr *) skb->data; 5436 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5437 IEEE80211_STYPE_BEACON); 5438 5439 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5440 chanctx_conf, 0); 5441 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5442 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5443 5444 beacon = rcu_dereference(ifmsh->beacon); 5445 if (!beacon) 5446 goto out; 5447 5448 if (beacon->cntdwn_counter_offsets[0]) { 5449 if (!is_template) 5450 /* TODO: For mesh csa_counter is in TU, so 5451 * decrementing it by one isn't correct, but 5452 * for now we leave it consistent with overall 5453 * mac80211's behavior. 5454 */ 5455 __ieee80211_beacon_update_cntdwn(beacon); 5456 5457 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5458 } 5459 5460 if (ifmsh->sync_ops) 5461 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5462 5463 skb = dev_alloc_skb(local->tx_headroom + 5464 beacon->head_len + 5465 256 + /* TIM IE */ 5466 beacon->tail_len + 5467 local->hw.extra_beacon_tailroom); 5468 if (!skb) 5469 goto out; 5470 skb_reserve(skb, local->tx_headroom); 5471 skb_put_data(skb, beacon->head, beacon->head_len); 5472 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5473 is_template); 5474 5475 if (offs) { 5476 offs->tim_offset = beacon->head_len; 5477 offs->tim_length = skb->len - beacon->head_len; 5478 } 5479 5480 skb_put_data(skb, beacon->tail, beacon->tail_len); 5481 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5482 chanctx_conf, 0); 5483 } else { 5484 WARN_ON(1); 5485 goto out; 5486 } 5487 5488 out: 5489 rcu_read_unlock(); 5490 return skb; 5491 5492 } 5493 5494 struct sk_buff * 5495 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5496 struct ieee80211_vif *vif, 5497 struct ieee80211_mutable_offsets *offs, 5498 unsigned int link_id) 5499 { 5500 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5501 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5502 } 5503 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5504 5505 struct sk_buff * 5506 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5507 struct ieee80211_vif *vif, 5508 struct ieee80211_mutable_offsets *offs, 5509 unsigned int link_id, u8 ema_index) 5510 { 5511 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5512 NULL); 5513 } 5514 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5515 5516 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5517 { 5518 u8 i; 5519 5520 if (!ema_beacons) 5521 return; 5522 5523 for (i = 0; i < ema_beacons->cnt; i++) 5524 kfree_skb(ema_beacons->bcn[i].skb); 5525 5526 kfree(ema_beacons); 5527 } 5528 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5529 5530 struct ieee80211_ema_beacons * 5531 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5532 struct ieee80211_vif *vif, 5533 unsigned int link_id) 5534 { 5535 struct ieee80211_ema_beacons *ema_beacons = NULL; 5536 5537 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5538 &ema_beacons)); 5539 5540 return ema_beacons; 5541 } 5542 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5543 5544 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5545 struct ieee80211_vif *vif, 5546 u16 *tim_offset, u16 *tim_length, 5547 unsigned int link_id) 5548 { 5549 struct ieee80211_mutable_offsets offs = {}; 5550 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5551 link_id, 5552 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5553 NULL); 5554 struct sk_buff *copy; 5555 int shift; 5556 5557 if (!bcn) 5558 return bcn; 5559 5560 if (tim_offset) 5561 *tim_offset = offs.tim_offset; 5562 5563 if (tim_length) 5564 *tim_length = offs.tim_length; 5565 5566 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5567 !hw_to_local(hw)->monitors) 5568 return bcn; 5569 5570 /* send a copy to monitor interfaces */ 5571 copy = skb_copy(bcn, GFP_ATOMIC); 5572 if (!copy) 5573 return bcn; 5574 5575 shift = ieee80211_vif_get_shift(vif); 5576 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5577 5578 return bcn; 5579 } 5580 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5581 5582 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5583 struct ieee80211_vif *vif) 5584 { 5585 struct sk_buff *skb = NULL; 5586 struct probe_resp *presp = NULL; 5587 struct ieee80211_hdr *hdr; 5588 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5589 5590 if (sdata->vif.type != NL80211_IFTYPE_AP) 5591 return NULL; 5592 5593 rcu_read_lock(); 5594 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5595 if (!presp) 5596 goto out; 5597 5598 skb = dev_alloc_skb(presp->len); 5599 if (!skb) 5600 goto out; 5601 5602 skb_put_data(skb, presp->data, presp->len); 5603 5604 hdr = (struct ieee80211_hdr *) skb->data; 5605 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5606 5607 out: 5608 rcu_read_unlock(); 5609 return skb; 5610 } 5611 EXPORT_SYMBOL(ieee80211_proberesp_get); 5612 5613 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5614 struct ieee80211_vif *vif) 5615 { 5616 struct sk_buff *skb = NULL; 5617 struct fils_discovery_data *tmpl = NULL; 5618 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5619 5620 if (sdata->vif.type != NL80211_IFTYPE_AP) 5621 return NULL; 5622 5623 rcu_read_lock(); 5624 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5625 if (!tmpl) { 5626 rcu_read_unlock(); 5627 return NULL; 5628 } 5629 5630 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5631 if (skb) { 5632 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5633 skb_put_data(skb, tmpl->data, tmpl->len); 5634 } 5635 5636 rcu_read_unlock(); 5637 return skb; 5638 } 5639 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5640 5641 struct sk_buff * 5642 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5643 struct ieee80211_vif *vif) 5644 { 5645 struct sk_buff *skb = NULL; 5646 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5647 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5648 5649 if (sdata->vif.type != NL80211_IFTYPE_AP) 5650 return NULL; 5651 5652 rcu_read_lock(); 5653 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5654 if (!tmpl) { 5655 rcu_read_unlock(); 5656 return NULL; 5657 } 5658 5659 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5660 if (skb) { 5661 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5662 skb_put_data(skb, tmpl->data, tmpl->len); 5663 } 5664 5665 rcu_read_unlock(); 5666 return skb; 5667 } 5668 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5669 5670 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5671 struct ieee80211_vif *vif) 5672 { 5673 struct ieee80211_sub_if_data *sdata; 5674 struct ieee80211_pspoll *pspoll; 5675 struct ieee80211_local *local; 5676 struct sk_buff *skb; 5677 5678 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5679 return NULL; 5680 5681 sdata = vif_to_sdata(vif); 5682 local = sdata->local; 5683 5684 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5685 if (!skb) 5686 return NULL; 5687 5688 skb_reserve(skb, local->hw.extra_tx_headroom); 5689 5690 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5691 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5692 IEEE80211_STYPE_PSPOLL); 5693 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5694 5695 /* aid in PS-Poll has its two MSBs each set to 1 */ 5696 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5697 5698 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5699 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5700 5701 return skb; 5702 } 5703 EXPORT_SYMBOL(ieee80211_pspoll_get); 5704 5705 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5706 struct ieee80211_vif *vif, 5707 int link_id, bool qos_ok) 5708 { 5709 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5710 struct ieee80211_local *local = sdata->local; 5711 struct ieee80211_link_data *link = NULL; 5712 struct ieee80211_hdr_3addr *nullfunc; 5713 struct sk_buff *skb; 5714 bool qos = false; 5715 5716 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5717 return NULL; 5718 5719 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5720 sizeof(*nullfunc) + 2); 5721 if (!skb) 5722 return NULL; 5723 5724 rcu_read_lock(); 5725 if (qos_ok) { 5726 struct sta_info *sta; 5727 5728 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5729 qos = sta && sta->sta.wme; 5730 } 5731 5732 if (link_id >= 0) { 5733 link = rcu_dereference(sdata->link[link_id]); 5734 if (WARN_ON_ONCE(!link)) { 5735 rcu_read_unlock(); 5736 kfree_skb(skb); 5737 return NULL; 5738 } 5739 } 5740 5741 skb_reserve(skb, local->hw.extra_tx_headroom); 5742 5743 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5744 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5745 IEEE80211_STYPE_NULLFUNC | 5746 IEEE80211_FCTL_TODS); 5747 if (qos) { 5748 __le16 qoshdr = cpu_to_le16(7); 5749 5750 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5751 IEEE80211_STYPE_NULLFUNC) != 5752 IEEE80211_STYPE_QOS_NULLFUNC); 5753 nullfunc->frame_control |= 5754 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5755 skb->priority = 7; 5756 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5757 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5758 } 5759 5760 if (link) { 5761 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5762 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5763 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5764 } else { 5765 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5766 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5767 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5768 } 5769 rcu_read_unlock(); 5770 5771 return skb; 5772 } 5773 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5774 5775 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5776 const u8 *src_addr, 5777 const u8 *ssid, size_t ssid_len, 5778 size_t tailroom) 5779 { 5780 struct ieee80211_local *local = hw_to_local(hw); 5781 struct ieee80211_hdr_3addr *hdr; 5782 struct sk_buff *skb; 5783 size_t ie_ssid_len; 5784 u8 *pos; 5785 5786 ie_ssid_len = 2 + ssid_len; 5787 5788 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5789 ie_ssid_len + tailroom); 5790 if (!skb) 5791 return NULL; 5792 5793 skb_reserve(skb, local->hw.extra_tx_headroom); 5794 5795 hdr = skb_put_zero(skb, sizeof(*hdr)); 5796 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5797 IEEE80211_STYPE_PROBE_REQ); 5798 eth_broadcast_addr(hdr->addr1); 5799 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5800 eth_broadcast_addr(hdr->addr3); 5801 5802 pos = skb_put(skb, ie_ssid_len); 5803 *pos++ = WLAN_EID_SSID; 5804 *pos++ = ssid_len; 5805 if (ssid_len) 5806 memcpy(pos, ssid, ssid_len); 5807 pos += ssid_len; 5808 5809 return skb; 5810 } 5811 EXPORT_SYMBOL(ieee80211_probereq_get); 5812 5813 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5814 const void *frame, size_t frame_len, 5815 const struct ieee80211_tx_info *frame_txctl, 5816 struct ieee80211_rts *rts) 5817 { 5818 const struct ieee80211_hdr *hdr = frame; 5819 5820 rts->frame_control = 5821 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5822 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5823 frame_txctl); 5824 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5825 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5826 } 5827 EXPORT_SYMBOL(ieee80211_rts_get); 5828 5829 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5830 const void *frame, size_t frame_len, 5831 const struct ieee80211_tx_info *frame_txctl, 5832 struct ieee80211_cts *cts) 5833 { 5834 const struct ieee80211_hdr *hdr = frame; 5835 5836 cts->frame_control = 5837 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5838 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5839 frame_len, frame_txctl); 5840 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5841 } 5842 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5843 5844 struct sk_buff * 5845 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5846 struct ieee80211_vif *vif) 5847 { 5848 struct ieee80211_local *local = hw_to_local(hw); 5849 struct sk_buff *skb = NULL; 5850 struct ieee80211_tx_data tx; 5851 struct ieee80211_sub_if_data *sdata; 5852 struct ps_data *ps; 5853 struct ieee80211_tx_info *info; 5854 struct ieee80211_chanctx_conf *chanctx_conf; 5855 5856 sdata = vif_to_sdata(vif); 5857 5858 rcu_read_lock(); 5859 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5860 5861 if (!chanctx_conf) 5862 goto out; 5863 5864 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5865 struct beacon_data *beacon = 5866 rcu_dereference(sdata->deflink.u.ap.beacon); 5867 5868 if (!beacon || !beacon->head) 5869 goto out; 5870 5871 ps = &sdata->u.ap.ps; 5872 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5873 ps = &sdata->u.mesh.ps; 5874 } else { 5875 goto out; 5876 } 5877 5878 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5879 goto out; /* send buffered bc/mc only after DTIM beacon */ 5880 5881 while (1) { 5882 skb = skb_dequeue(&ps->bc_buf); 5883 if (!skb) 5884 goto out; 5885 local->total_ps_buffered--; 5886 5887 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5888 struct ieee80211_hdr *hdr = 5889 (struct ieee80211_hdr *) skb->data; 5890 /* more buffered multicast/broadcast frames ==> set 5891 * MoreData flag in IEEE 802.11 header to inform PS 5892 * STAs */ 5893 hdr->frame_control |= 5894 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5895 } 5896 5897 if (sdata->vif.type == NL80211_IFTYPE_AP) 5898 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5899 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5900 break; 5901 ieee80211_free_txskb(hw, skb); 5902 } 5903 5904 info = IEEE80211_SKB_CB(skb); 5905 5906 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5907 info->band = chanctx_conf->def.chan->band; 5908 5909 if (invoke_tx_handlers(&tx)) 5910 skb = NULL; 5911 out: 5912 rcu_read_unlock(); 5913 5914 return skb; 5915 } 5916 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5917 5918 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5919 { 5920 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5921 struct ieee80211_sub_if_data *sdata = sta->sdata; 5922 struct ieee80211_local *local = sdata->local; 5923 int ret; 5924 u32 queues; 5925 5926 lockdep_assert_held(&local->sta_mtx); 5927 5928 /* only some cases are supported right now */ 5929 switch (sdata->vif.type) { 5930 case NL80211_IFTYPE_STATION: 5931 case NL80211_IFTYPE_AP: 5932 case NL80211_IFTYPE_AP_VLAN: 5933 break; 5934 default: 5935 WARN_ON(1); 5936 return -EINVAL; 5937 } 5938 5939 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5940 return -EINVAL; 5941 5942 if (sta->reserved_tid == tid) { 5943 ret = 0; 5944 goto out; 5945 } 5946 5947 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5948 sdata_err(sdata, "TID reservation already active\n"); 5949 ret = -EALREADY; 5950 goto out; 5951 } 5952 5953 ieee80211_stop_vif_queues(sdata->local, sdata, 5954 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5955 5956 synchronize_net(); 5957 5958 /* Tear down BA sessions so we stop aggregating on this TID */ 5959 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5960 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5961 __ieee80211_stop_tx_ba_session(sta, tid, 5962 AGG_STOP_LOCAL_REQUEST); 5963 } 5964 5965 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5966 __ieee80211_flush_queues(local, sdata, queues, false); 5967 5968 sta->reserved_tid = tid; 5969 5970 ieee80211_wake_vif_queues(local, sdata, 5971 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5972 5973 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5974 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5975 5976 ret = 0; 5977 out: 5978 return ret; 5979 } 5980 EXPORT_SYMBOL(ieee80211_reserve_tid); 5981 5982 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5983 { 5984 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5985 struct ieee80211_sub_if_data *sdata = sta->sdata; 5986 5987 lockdep_assert_held(&sdata->local->sta_mtx); 5988 5989 /* only some cases are supported right now */ 5990 switch (sdata->vif.type) { 5991 case NL80211_IFTYPE_STATION: 5992 case NL80211_IFTYPE_AP: 5993 case NL80211_IFTYPE_AP_VLAN: 5994 break; 5995 default: 5996 WARN_ON(1); 5997 return; 5998 } 5999 6000 if (tid != sta->reserved_tid) { 6001 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6002 return; 6003 } 6004 6005 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6006 } 6007 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6008 6009 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6010 struct sk_buff *skb, int tid, int link_id, 6011 enum nl80211_band band) 6012 { 6013 const struct ieee80211_hdr *hdr = (void *)skb->data; 6014 int ac = ieee80211_ac_from_tid(tid); 6015 unsigned int link; 6016 6017 skb_reset_mac_header(skb); 6018 skb_set_queue_mapping(skb, ac); 6019 skb->priority = tid; 6020 6021 skb->dev = sdata->dev; 6022 6023 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6024 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6025 IEEE80211_LINK_UNSPECIFIED)); 6026 6027 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6028 link = 0; 6029 } else if (link_id >= 0) { 6030 link = link_id; 6031 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6032 /* address from the MLD */ 6033 link = IEEE80211_LINK_UNSPECIFIED; 6034 } else { 6035 /* otherwise must be addressed from a link */ 6036 rcu_read_lock(); 6037 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6038 struct ieee80211_bss_conf *link_conf; 6039 6040 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6041 if (!link_conf) 6042 continue; 6043 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6044 break; 6045 } 6046 rcu_read_unlock(); 6047 6048 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6049 link = ffs(sdata->vif.active_links) - 1; 6050 } 6051 6052 IEEE80211_SKB_CB(skb)->control.flags |= 6053 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6054 6055 /* 6056 * The other path calling ieee80211_xmit is from the tasklet, 6057 * and while we can handle concurrent transmissions locking 6058 * requirements are that we do not come into tx with bhs on. 6059 */ 6060 local_bh_disable(); 6061 IEEE80211_SKB_CB(skb)->band = band; 6062 ieee80211_xmit(sdata, NULL, skb); 6063 local_bh_enable(); 6064 } 6065 6066 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6067 struct sk_buff *skb, int tid, int link_id) 6068 { 6069 struct ieee80211_chanctx_conf *chanctx_conf; 6070 enum nl80211_band band; 6071 6072 rcu_read_lock(); 6073 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6074 WARN_ON(link_id >= 0); 6075 chanctx_conf = 6076 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6077 if (WARN_ON(!chanctx_conf)) { 6078 rcu_read_unlock(); 6079 kfree_skb(skb); 6080 return; 6081 } 6082 band = chanctx_conf->def.chan->band; 6083 } else { 6084 WARN_ON(link_id >= 0 && 6085 !(sdata->vif.active_links & BIT(link_id))); 6086 /* MLD transmissions must not rely on the band */ 6087 band = 0; 6088 } 6089 6090 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6091 rcu_read_unlock(); 6092 } 6093 6094 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6095 const u8 *buf, size_t len, 6096 const u8 *dest, __be16 proto, bool unencrypted, 6097 int link_id, u64 *cookie) 6098 { 6099 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6100 struct ieee80211_local *local = sdata->local; 6101 struct sta_info *sta; 6102 struct sk_buff *skb; 6103 struct ethhdr *ehdr; 6104 u32 ctrl_flags = 0; 6105 u32 flags = 0; 6106 int err; 6107 6108 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6109 * or Pre-Authentication 6110 */ 6111 if (proto != sdata->control_port_protocol && 6112 proto != cpu_to_be16(ETH_P_PREAUTH)) 6113 return -EINVAL; 6114 6115 if (proto == sdata->control_port_protocol) 6116 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6117 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6118 6119 if (unencrypted) 6120 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6121 6122 if (cookie) 6123 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6124 6125 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6126 6127 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6128 sizeof(struct ethhdr) + len); 6129 if (!skb) 6130 return -ENOMEM; 6131 6132 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6133 6134 skb_put_data(skb, buf, len); 6135 6136 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6137 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6138 6139 /* we may override the SA for MLO STA later */ 6140 if (link_id < 0) { 6141 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6142 IEEE80211_TX_CTRL_MLO_LINK); 6143 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6144 } else { 6145 struct ieee80211_bss_conf *link_conf; 6146 6147 ctrl_flags |= u32_encode_bits(link_id, 6148 IEEE80211_TX_CTRL_MLO_LINK); 6149 6150 rcu_read_lock(); 6151 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6152 if (!link_conf) { 6153 dev_kfree_skb(skb); 6154 rcu_read_unlock(); 6155 return -ENOLINK; 6156 } 6157 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6158 rcu_read_unlock(); 6159 } 6160 6161 ehdr->h_proto = proto; 6162 6163 skb->dev = dev; 6164 skb->protocol = proto; 6165 skb_reset_network_header(skb); 6166 skb_reset_mac_header(skb); 6167 6168 if (local->hw.queues < IEEE80211_NUM_ACS) 6169 goto start_xmit; 6170 6171 /* update QoS header to prioritize control port frames if possible, 6172 * priorization also happens for control port frames send over 6173 * AF_PACKET 6174 */ 6175 rcu_read_lock(); 6176 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6177 if (err) { 6178 dev_kfree_skb(skb); 6179 rcu_read_unlock(); 6180 return err; 6181 } 6182 6183 if (!IS_ERR(sta)) { 6184 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6185 6186 skb_set_queue_mapping(skb, queue); 6187 6188 /* 6189 * for MLO STA, the SA should be the AP MLD address, but 6190 * the link ID has been selected already 6191 */ 6192 if (sta && sta->sta.mlo) 6193 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6194 } 6195 rcu_read_unlock(); 6196 6197 start_xmit: 6198 /* mutex lock is only needed for incrementing the cookie counter */ 6199 mutex_lock(&local->mtx); 6200 6201 local_bh_disable(); 6202 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6203 local_bh_enable(); 6204 6205 mutex_unlock(&local->mtx); 6206 6207 return 0; 6208 } 6209 6210 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6211 const u8 *buf, size_t len) 6212 { 6213 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6214 struct ieee80211_local *local = sdata->local; 6215 struct sk_buff *skb; 6216 6217 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6218 30 + /* header size */ 6219 18); /* 11s header size */ 6220 if (!skb) 6221 return -ENOMEM; 6222 6223 skb_reserve(skb, local->hw.extra_tx_headroom); 6224 skb_put_data(skb, buf, len); 6225 6226 skb->dev = dev; 6227 skb->protocol = htons(ETH_P_802_3); 6228 skb_reset_network_header(skb); 6229 skb_reset_mac_header(skb); 6230 6231 local_bh_disable(); 6232 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6233 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6234 NULL); 6235 local_bh_enable(); 6236 6237 return 0; 6238 } 6239