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) 2018-2022 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 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 42 struct sk_buff *skb, int group_addr, 43 int next_frag_len) 44 { 45 int rate, mrate, erp, dur, i, shift = 0; 46 struct ieee80211_rate *txrate; 47 struct ieee80211_local *local = tx->local; 48 struct ieee80211_supported_band *sband; 49 struct ieee80211_hdr *hdr; 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 51 struct ieee80211_chanctx_conf *chanctx_conf; 52 u32 rate_flags = 0; 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 rcu_read_lock(); 59 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 60 if (chanctx_conf) { 61 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 } 64 rcu_read_unlock(); 65 66 /* uh huh? */ 67 if (WARN_ON_ONCE(tx->rate.idx < 0)) 68 return 0; 69 70 sband = local->hw.wiphy->bands[info->band]; 71 txrate = &sband->bitrates[tx->rate.idx]; 72 73 erp = txrate->flags & IEEE80211_RATE_ERP_G; 74 75 /* device is expected to do this */ 76 if (sband->band == NL80211_BAND_S1GHZ) 77 return 0; 78 79 /* 80 * data and mgmt (except PS Poll): 81 * - during CFP: 32768 82 * - during contention period: 83 * if addr1 is group address: 0 84 * if more fragments = 0 and addr1 is individual address: time to 85 * transmit one ACK plus SIFS 86 * if more fragments = 1 and addr1 is individual address: time to 87 * transmit next fragment plus 2 x ACK plus 3 x SIFS 88 * 89 * IEEE 802.11, 9.6: 90 * - control response frame (CTS or ACK) shall be transmitted using the 91 * same rate as the immediately previous frame in the frame exchange 92 * sequence, if this rate belongs to the PHY mandatory rates, or else 93 * at the highest possible rate belonging to the PHY rates in the 94 * BSSBasicRateSet 95 */ 96 hdr = (struct ieee80211_hdr *)skb->data; 97 if (ieee80211_is_ctl(hdr->frame_control)) { 98 /* TODO: These control frames are not currently sent by 99 * mac80211, but should they be implemented, this function 100 * needs to be updated to support duration field calculation. 101 * 102 * RTS: time needed to transmit pending data/mgmt frame plus 103 * one CTS frame plus one ACK frame plus 3 x SIFS 104 * CTS: duration of immediately previous RTS minus time 105 * required to transmit CTS and its SIFS 106 * ACK: 0 if immediately previous directed data/mgmt had 107 * more=0, with more=1 duration in ACK frame is duration 108 * from previous frame minus time needed to transmit ACK 109 * and its SIFS 110 * PS Poll: BIT(15) | BIT(14) | aid 111 */ 112 return 0; 113 } 114 115 /* data/mgmt */ 116 if (0 /* FIX: data/mgmt during CFP */) 117 return cpu_to_le16(32768); 118 119 if (group_addr) /* Group address as the destination - no ACK */ 120 return 0; 121 122 /* Individual destination address: 123 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 124 * CTS and ACK frames shall be transmitted using the highest rate in 125 * basic rate set that is less than or equal to the rate of the 126 * immediately previous frame and that is using the same modulation 127 * (CCK or OFDM). If no basic rate set matches with these requirements, 128 * the highest mandatory rate of the PHY that is less than or equal to 129 * the rate of the previous frame is used. 130 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 131 */ 132 rate = -1; 133 /* use lowest available if everything fails */ 134 mrate = sband->bitrates[0].bitrate; 135 for (i = 0; i < sband->n_bitrates; i++) { 136 struct ieee80211_rate *r = &sband->bitrates[i]; 137 138 if (r->bitrate > txrate->bitrate) 139 break; 140 141 if ((rate_flags & r->flags) != rate_flags) 142 continue; 143 144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 145 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 146 147 switch (sband->band) { 148 case NL80211_BAND_2GHZ: 149 case NL80211_BAND_LC: { 150 u32 flag; 151 if (tx->sdata->deflink.operating_11g_mode) 152 flag = IEEE80211_RATE_MANDATORY_G; 153 else 154 flag = IEEE80211_RATE_MANDATORY_B; 155 if (r->flags & flag) 156 mrate = r->bitrate; 157 break; 158 } 159 case NL80211_BAND_5GHZ: 160 case NL80211_BAND_6GHZ: 161 if (r->flags & IEEE80211_RATE_MANDATORY_A) 162 mrate = r->bitrate; 163 break; 164 case NL80211_BAND_S1GHZ: 165 case NL80211_BAND_60GHZ: 166 /* TODO, for now fall through */ 167 case NUM_NL80211_BANDS: 168 WARN_ON(1); 169 break; 170 } 171 } 172 if (rate == -1) { 173 /* No matching basic rate found; use highest suitable mandatory 174 * PHY rate */ 175 rate = DIV_ROUND_UP(mrate, 1 << shift); 176 } 177 178 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 179 if (ieee80211_is_data_qos(hdr->frame_control) && 180 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 181 dur = 0; 182 else 183 /* Time needed to transmit ACK 184 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 185 * to closest integer */ 186 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 187 tx->sdata->vif.bss_conf.use_short_preamble, 188 shift); 189 190 if (next_frag_len) { 191 /* Frame is fragmented: duration increases with time needed to 192 * transmit next fragment plus ACK and 2 x SIFS. */ 193 dur *= 2; /* ACK + SIFS */ 194 /* next fragment */ 195 dur += ieee80211_frame_duration(sband->band, next_frag_len, 196 txrate->bitrate, erp, 197 tx->sdata->vif.bss_conf.use_short_preamble, 198 shift); 199 } 200 201 return cpu_to_le16(dur); 202 } 203 204 /* tx handlers */ 205 static ieee80211_tx_result debug_noinline 206 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 207 { 208 struct ieee80211_local *local = tx->local; 209 struct ieee80211_if_managed *ifmgd; 210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 211 212 /* driver doesn't support power save */ 213 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 214 return TX_CONTINUE; 215 216 /* hardware does dynamic power save */ 217 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 218 return TX_CONTINUE; 219 220 /* dynamic power save disabled */ 221 if (local->hw.conf.dynamic_ps_timeout <= 0) 222 return TX_CONTINUE; 223 224 /* we are scanning, don't enable power save */ 225 if (local->scanning) 226 return TX_CONTINUE; 227 228 if (!local->ps_sdata) 229 return TX_CONTINUE; 230 231 /* No point if we're going to suspend */ 232 if (local->quiescing) 233 return TX_CONTINUE; 234 235 /* dynamic ps is supported only in managed mode */ 236 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 237 return TX_CONTINUE; 238 239 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 240 return TX_CONTINUE; 241 242 ifmgd = &tx->sdata->u.mgd; 243 244 /* 245 * Don't wakeup from power save if u-apsd is enabled, voip ac has 246 * u-apsd enabled and the frame is in voip class. This effectively 247 * means that even if all access categories have u-apsd enabled, in 248 * practise u-apsd is only used with the voip ac. This is a 249 * workaround for the case when received voip class packets do not 250 * have correct qos tag for some reason, due the network or the 251 * peer application. 252 * 253 * Note: ifmgd->uapsd_queues access is racy here. If the value is 254 * changed via debugfs, user needs to reassociate manually to have 255 * everything in sync. 256 */ 257 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 258 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 259 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 260 return TX_CONTINUE; 261 262 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 263 ieee80211_stop_queues_by_reason(&local->hw, 264 IEEE80211_MAX_QUEUE_MAP, 265 IEEE80211_QUEUE_STOP_REASON_PS, 266 false); 267 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 268 ieee80211_queue_work(&local->hw, 269 &local->dynamic_ps_disable_work); 270 } 271 272 /* Don't restart the timer if we're not disassociated */ 273 if (!ifmgd->associated) 274 return TX_CONTINUE; 275 276 mod_timer(&local->dynamic_ps_timer, jiffies + 277 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 278 279 return TX_CONTINUE; 280 } 281 282 static ieee80211_tx_result debug_noinline 283 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 284 { 285 286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 288 bool assoc = false; 289 290 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 291 return TX_CONTINUE; 292 293 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 294 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 295 !ieee80211_is_probe_req(hdr->frame_control) && 296 !ieee80211_is_any_nullfunc(hdr->frame_control)) 297 /* 298 * When software scanning only nullfunc frames (to notify 299 * the sleep state to the AP) and probe requests (for the 300 * active scan) are allowed, all other frames should not be 301 * sent and we should not get here, but if we do 302 * nonetheless, drop them to avoid sending them 303 * off-channel. See the link below and 304 * ieee80211_start_scan() for more. 305 * 306 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 307 */ 308 return TX_DROP; 309 310 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 311 return TX_CONTINUE; 312 313 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 314 return TX_CONTINUE; 315 316 if (tx->sta) 317 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 318 319 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 320 if (unlikely(!assoc && 321 ieee80211_is_data(hdr->frame_control))) { 322 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 323 sdata_info(tx->sdata, 324 "dropped data frame to not associated station %pM\n", 325 hdr->addr1); 326 #endif 327 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 328 return TX_DROP; 329 } 330 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 331 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 332 /* 333 * No associated STAs - no need to send multicast 334 * frames. 335 */ 336 return TX_DROP; 337 } 338 339 return TX_CONTINUE; 340 } 341 342 /* This function is called whenever the AP is about to exceed the maximum limit 343 * of buffered frames for power saving STAs. This situation should not really 344 * happen often during normal operation, so dropping the oldest buffered packet 345 * from each queue should be OK to make some room for new frames. */ 346 static void purge_old_ps_buffers(struct ieee80211_local *local) 347 { 348 int total = 0, purged = 0; 349 struct sk_buff *skb; 350 struct ieee80211_sub_if_data *sdata; 351 struct sta_info *sta; 352 353 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 354 struct ps_data *ps; 355 356 if (sdata->vif.type == NL80211_IFTYPE_AP) 357 ps = &sdata->u.ap.ps; 358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 359 ps = &sdata->u.mesh.ps; 360 else 361 continue; 362 363 skb = skb_dequeue(&ps->bc_buf); 364 if (skb) { 365 purged++; 366 ieee80211_free_txskb(&local->hw, skb); 367 } 368 total += skb_queue_len(&ps->bc_buf); 369 } 370 371 /* 372 * Drop one frame from each station from the lowest-priority 373 * AC that has frames at all. 374 */ 375 list_for_each_entry_rcu(sta, &local->sta_list, list) { 376 int ac; 377 378 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 379 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 380 total += skb_queue_len(&sta->ps_tx_buf[ac]); 381 if (skb) { 382 purged++; 383 ieee80211_free_txskb(&local->hw, skb); 384 break; 385 } 386 } 387 } 388 389 local->total_ps_buffered = total; 390 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 391 } 392 393 static ieee80211_tx_result 394 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 395 { 396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 398 struct ps_data *ps; 399 400 /* 401 * broadcast/multicast frame 402 * 403 * If any of the associated/peer stations is in power save mode, 404 * the frame is buffered to be sent after DTIM beacon frame. 405 * This is done either by the hardware or us. 406 */ 407 408 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 409 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 410 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 411 if (!tx->sdata->bss) 412 return TX_CONTINUE; 413 414 ps = &tx->sdata->bss->ps; 415 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 416 ps = &tx->sdata->u.mesh.ps; 417 } else { 418 return TX_CONTINUE; 419 } 420 421 422 /* no buffering for ordered frames */ 423 if (ieee80211_has_order(hdr->frame_control)) 424 return TX_CONTINUE; 425 426 if (ieee80211_is_probe_req(hdr->frame_control)) 427 return TX_CONTINUE; 428 429 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 430 info->hw_queue = tx->sdata->vif.cab_queue; 431 432 /* no stations in PS mode and no buffered packets */ 433 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 434 return TX_CONTINUE; 435 436 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 437 438 /* device releases frame after DTIM beacon */ 439 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 440 return TX_CONTINUE; 441 442 /* buffered in mac80211 */ 443 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 444 purge_old_ps_buffers(tx->local); 445 446 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 447 ps_dbg(tx->sdata, 448 "BC TX buffer full - dropping the oldest frame\n"); 449 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 450 } else 451 tx->local->total_ps_buffered++; 452 453 skb_queue_tail(&ps->bc_buf, tx->skb); 454 455 return TX_QUEUED; 456 } 457 458 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 459 struct sk_buff *skb) 460 { 461 if (!ieee80211_is_mgmt(fc)) 462 return 0; 463 464 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 465 return 0; 466 467 if (!ieee80211_is_robust_mgmt_frame(skb)) 468 return 0; 469 470 return 1; 471 } 472 473 static ieee80211_tx_result 474 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 475 { 476 struct sta_info *sta = tx->sta; 477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 479 struct ieee80211_local *local = tx->local; 480 481 if (unlikely(!sta)) 482 return TX_CONTINUE; 483 484 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 485 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 486 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 487 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 488 int ac = skb_get_queue_mapping(tx->skb); 489 490 if (ieee80211_is_mgmt(hdr->frame_control) && 491 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 492 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 493 return TX_CONTINUE; 494 } 495 496 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 497 sta->sta.addr, sta->sta.aid, ac); 498 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 499 purge_old_ps_buffers(tx->local); 500 501 /* sync with ieee80211_sta_ps_deliver_wakeup */ 502 spin_lock(&sta->ps_lock); 503 /* 504 * STA woke up the meantime and all the frames on ps_tx_buf have 505 * been queued to pending queue. No reordering can happen, go 506 * ahead and Tx the packet. 507 */ 508 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 509 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 510 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 511 spin_unlock(&sta->ps_lock); 512 return TX_CONTINUE; 513 } 514 515 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 516 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 517 ps_dbg(tx->sdata, 518 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 519 sta->sta.addr, ac); 520 ieee80211_free_txskb(&local->hw, old); 521 } else 522 tx->local->total_ps_buffered++; 523 524 info->control.jiffies = jiffies; 525 info->control.vif = &tx->sdata->vif; 526 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 527 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 528 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 529 spin_unlock(&sta->ps_lock); 530 531 if (!timer_pending(&local->sta_cleanup)) 532 mod_timer(&local->sta_cleanup, 533 round_jiffies(jiffies + 534 STA_INFO_CLEANUP_INTERVAL)); 535 536 /* 537 * We queued up some frames, so the TIM bit might 538 * need to be set, recalculate it. 539 */ 540 sta_info_recalc_tim(sta); 541 542 return TX_QUEUED; 543 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 544 ps_dbg(tx->sdata, 545 "STA %pM in PS mode, but polling/in SP -> send frame\n", 546 sta->sta.addr); 547 } 548 549 return TX_CONTINUE; 550 } 551 552 static ieee80211_tx_result debug_noinline 553 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 554 { 555 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 556 return TX_CONTINUE; 557 558 if (tx->flags & IEEE80211_TX_UNICAST) 559 return ieee80211_tx_h_unicast_ps_buf(tx); 560 else 561 return ieee80211_tx_h_multicast_ps_buf(tx); 562 } 563 564 static ieee80211_tx_result debug_noinline 565 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 566 { 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 569 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 570 if (tx->sdata->control_port_no_encrypt) 571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 572 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 573 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 574 } 575 576 return TX_CONTINUE; 577 } 578 579 static struct ieee80211_key * 580 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 581 { 582 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 enum { 585 USE_NONE, 586 USE_MGMT_KEY, 587 USE_MCAST_KEY, 588 } which_key = USE_NONE; 589 struct ieee80211_link_data *link; 590 unsigned int link_id; 591 592 if (ieee80211_is_group_privacy_action(tx->skb)) 593 which_key = USE_MCAST_KEY; 594 else if (ieee80211_is_mgmt(hdr->frame_control) && 595 is_multicast_ether_addr(hdr->addr1) && 596 ieee80211_is_robust_mgmt_frame(tx->skb)) 597 which_key = USE_MGMT_KEY; 598 else if (is_multicast_ether_addr(hdr->addr1)) 599 which_key = USE_MCAST_KEY; 600 else 601 return NULL; 602 603 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 604 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 605 link = &tx->sdata->deflink; 606 } else { 607 link = rcu_dereference(tx->sdata->link[link_id]); 608 if (!link) 609 return NULL; 610 } 611 612 switch (which_key) { 613 case USE_NONE: 614 break; 615 case USE_MGMT_KEY: 616 return rcu_dereference(link->default_mgmt_key); 617 case USE_MCAST_KEY: 618 return rcu_dereference(link->default_multicast_key); 619 } 620 621 return NULL; 622 } 623 624 static ieee80211_tx_result debug_noinline 625 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 626 { 627 struct ieee80211_key *key; 628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 629 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 630 631 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 632 tx->key = NULL; 633 return TX_CONTINUE; 634 } 635 636 if (tx->sta && 637 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 638 tx->key = key; 639 else if ((key = ieee80211_select_link_key(tx))) 640 tx->key = key; 641 else if (!is_multicast_ether_addr(hdr->addr1) && 642 (key = rcu_dereference(tx->sdata->default_unicast_key))) 643 tx->key = key; 644 else 645 tx->key = NULL; 646 647 if (tx->key) { 648 bool skip_hw = false; 649 650 /* TODO: add threshold stuff again */ 651 652 switch (tx->key->conf.cipher) { 653 case WLAN_CIPHER_SUITE_WEP40: 654 case WLAN_CIPHER_SUITE_WEP104: 655 case WLAN_CIPHER_SUITE_TKIP: 656 if (!ieee80211_is_data_present(hdr->frame_control)) 657 tx->key = NULL; 658 break; 659 case WLAN_CIPHER_SUITE_CCMP: 660 case WLAN_CIPHER_SUITE_CCMP_256: 661 case WLAN_CIPHER_SUITE_GCMP: 662 case WLAN_CIPHER_SUITE_GCMP_256: 663 if (!ieee80211_is_data_present(hdr->frame_control) && 664 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 665 tx->skb) && 666 !ieee80211_is_group_privacy_action(tx->skb)) 667 tx->key = NULL; 668 else 669 skip_hw = (tx->key->conf.flags & 670 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 671 ieee80211_is_mgmt(hdr->frame_control); 672 break; 673 case WLAN_CIPHER_SUITE_AES_CMAC: 674 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 675 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 676 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 677 if (!ieee80211_is_mgmt(hdr->frame_control)) 678 tx->key = NULL; 679 break; 680 } 681 682 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 683 !ieee80211_is_deauth(hdr->frame_control))) 684 return TX_DROP; 685 686 if (!skip_hw && tx->key && 687 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 688 info->control.hw_key = &tx->key->conf; 689 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 690 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 691 return TX_DROP; 692 } 693 694 return TX_CONTINUE; 695 } 696 697 static ieee80211_tx_result debug_noinline 698 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 699 { 700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 701 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 702 struct ieee80211_supported_band *sband; 703 u32 len; 704 struct ieee80211_tx_rate_control txrc; 705 struct ieee80211_sta_rates *ratetbl = NULL; 706 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 707 bool assoc = false; 708 709 memset(&txrc, 0, sizeof(txrc)); 710 711 sband = tx->local->hw.wiphy->bands[info->band]; 712 713 len = min_t(u32, tx->skb->len + FCS_LEN, 714 tx->local->hw.wiphy->frag_threshold); 715 716 /* set up the tx rate control struct we give the RC algo */ 717 txrc.hw = &tx->local->hw; 718 txrc.sband = sband; 719 txrc.bss_conf = &tx->sdata->vif.bss_conf; 720 txrc.skb = tx->skb; 721 txrc.reported_rate.idx = -1; 722 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 723 724 if (tx->sdata->rc_has_mcs_mask[info->band]) 725 txrc.rate_idx_mcs_mask = 726 tx->sdata->rc_rateidx_mcs_mask[info->band]; 727 728 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 729 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 730 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 731 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 732 733 /* set up RTS protection if desired */ 734 if (len > tx->local->hw.wiphy->rts_threshold) { 735 txrc.rts = true; 736 } 737 738 info->control.use_rts = txrc.rts; 739 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 740 741 /* 742 * Use short preamble if the BSS can handle it, but not for 743 * management frames unless we know the receiver can handle 744 * that -- the management frame might be to a station that 745 * just wants a probe response. 746 */ 747 if (tx->sdata->vif.bss_conf.use_short_preamble && 748 (ieee80211_is_tx_data(tx->skb) || 749 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 750 txrc.short_preamble = true; 751 752 info->control.short_preamble = txrc.short_preamble; 753 754 /* don't ask rate control when rate already injected via radiotap */ 755 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 756 return TX_CONTINUE; 757 758 if (tx->sta) 759 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 760 761 /* 762 * Lets not bother rate control if we're associated and cannot 763 * talk to the sta. This should not happen. 764 */ 765 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 766 !rate_usable_index_exists(sband, &tx->sta->sta), 767 "%s: Dropped data frame as no usable bitrate found while " 768 "scanning and associated. Target station: " 769 "%pM on %d GHz band\n", 770 tx->sdata->name, 771 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 772 info->band ? 5 : 2)) 773 return TX_DROP; 774 775 /* 776 * If we're associated with the sta at this point we know we can at 777 * least send the frame at the lowest bit rate. 778 */ 779 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 780 781 if (tx->sta && !info->control.skip_table) 782 ratetbl = rcu_dereference(tx->sta->sta.rates); 783 784 if (unlikely(info->control.rates[0].idx < 0)) { 785 if (ratetbl) { 786 struct ieee80211_tx_rate rate = { 787 .idx = ratetbl->rate[0].idx, 788 .flags = ratetbl->rate[0].flags, 789 .count = ratetbl->rate[0].count 790 }; 791 792 if (ratetbl->rate[0].idx < 0) 793 return TX_DROP; 794 795 tx->rate = rate; 796 } else { 797 return TX_DROP; 798 } 799 } else { 800 tx->rate = info->control.rates[0]; 801 } 802 803 if (txrc.reported_rate.idx < 0) { 804 txrc.reported_rate = tx->rate; 805 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 806 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 807 } else if (tx->sta) 808 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 809 810 if (ratetbl) 811 return TX_CONTINUE; 812 813 if (unlikely(!info->control.rates[0].count)) 814 info->control.rates[0].count = 1; 815 816 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 817 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 818 info->control.rates[0].count = 1; 819 820 return TX_CONTINUE; 821 } 822 823 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 824 { 825 u16 *seq = &sta->tid_seq[tid]; 826 __le16 ret = cpu_to_le16(*seq); 827 828 /* Increase the sequence number. */ 829 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 830 831 return ret; 832 } 833 834 static ieee80211_tx_result debug_noinline 835 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 836 { 837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 838 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 839 int tid; 840 841 /* 842 * Packet injection may want to control the sequence 843 * number, if we have no matching interface then we 844 * neither assign one ourselves nor ask the driver to. 845 */ 846 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 847 return TX_CONTINUE; 848 849 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 850 return TX_CONTINUE; 851 852 if (ieee80211_hdrlen(hdr->frame_control) < 24) 853 return TX_CONTINUE; 854 855 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 856 return TX_CONTINUE; 857 858 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 859 return TX_CONTINUE; 860 861 /* SNS11 from 802.11be 10.3.2.14 */ 862 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 863 info->control.vif->valid_links && 864 info->control.vif->type == NL80211_IFTYPE_AP)) { 865 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 866 tx->sdata->mld_mcast_seq += 0x10; 867 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 868 return TX_CONTINUE; 869 } 870 871 /* 872 * Anything but QoS data that has a sequence number field 873 * (is long enough) gets a sequence number from the global 874 * counter. QoS data frames with a multicast destination 875 * also use the global counter (802.11-2012 9.3.2.10). 876 */ 877 if (!ieee80211_is_data_qos(hdr->frame_control) || 878 is_multicast_ether_addr(hdr->addr1)) { 879 /* driver should assign sequence number */ 880 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 881 /* for pure STA mode without beacons, we can do it */ 882 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 883 tx->sdata->sequence_number += 0x10; 884 if (tx->sta) 885 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 886 return TX_CONTINUE; 887 } 888 889 /* 890 * This should be true for injected/management frames only, for 891 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 892 * above since they are not QoS-data frames. 893 */ 894 if (!tx->sta) 895 return TX_CONTINUE; 896 897 /* include per-STA, per-TID sequence counter */ 898 tid = ieee80211_get_tid(hdr); 899 tx->sta->deflink.tx_stats.msdu[tid]++; 900 901 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 902 903 return TX_CONTINUE; 904 } 905 906 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 907 struct sk_buff *skb, int hdrlen, 908 int frag_threshold) 909 { 910 struct ieee80211_local *local = tx->local; 911 struct ieee80211_tx_info *info; 912 struct sk_buff *tmp; 913 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 914 int pos = hdrlen + per_fragm; 915 int rem = skb->len - hdrlen - per_fragm; 916 917 if (WARN_ON(rem < 0)) 918 return -EINVAL; 919 920 /* first fragment was already added to queue by caller */ 921 922 while (rem) { 923 int fraglen = per_fragm; 924 925 if (fraglen > rem) 926 fraglen = rem; 927 rem -= fraglen; 928 tmp = dev_alloc_skb(local->tx_headroom + 929 frag_threshold + 930 IEEE80211_ENCRYPT_HEADROOM + 931 IEEE80211_ENCRYPT_TAILROOM); 932 if (!tmp) 933 return -ENOMEM; 934 935 __skb_queue_tail(&tx->skbs, tmp); 936 937 skb_reserve(tmp, 938 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 939 940 /* copy control information */ 941 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 942 943 info = IEEE80211_SKB_CB(tmp); 944 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 945 IEEE80211_TX_CTL_FIRST_FRAGMENT); 946 947 if (rem) 948 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 949 950 skb_copy_queue_mapping(tmp, skb); 951 tmp->priority = skb->priority; 952 tmp->dev = skb->dev; 953 954 /* copy header and data */ 955 skb_put_data(tmp, skb->data, hdrlen); 956 skb_put_data(tmp, skb->data + pos, fraglen); 957 958 pos += fraglen; 959 } 960 961 /* adjust first fragment's length */ 962 skb_trim(skb, hdrlen + per_fragm); 963 return 0; 964 } 965 966 static ieee80211_tx_result debug_noinline 967 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 968 { 969 struct sk_buff *skb = tx->skb; 970 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 971 struct ieee80211_hdr *hdr = (void *)skb->data; 972 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 973 int hdrlen; 974 int fragnum; 975 976 /* no matter what happens, tx->skb moves to tx->skbs */ 977 __skb_queue_tail(&tx->skbs, skb); 978 tx->skb = NULL; 979 980 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 981 return TX_CONTINUE; 982 983 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 984 return TX_CONTINUE; 985 986 /* 987 * Warn when submitting a fragmented A-MPDU frame and drop it. 988 * This scenario is handled in ieee80211_tx_prepare but extra 989 * caution taken here as fragmented ampdu may cause Tx stop. 990 */ 991 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 992 return TX_DROP; 993 994 hdrlen = ieee80211_hdrlen(hdr->frame_control); 995 996 /* internal error, why isn't DONTFRAG set? */ 997 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 998 return TX_DROP; 999 1000 /* 1001 * Now fragment the frame. This will allocate all the fragments and 1002 * chain them (using skb as the first fragment) to skb->next. 1003 * During transmission, we will remove the successfully transmitted 1004 * fragments from this list. When the low-level driver rejects one 1005 * of the fragments then we will simply pretend to accept the skb 1006 * but store it away as pending. 1007 */ 1008 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 1009 return TX_DROP; 1010 1011 /* update duration/seq/flags of fragments */ 1012 fragnum = 0; 1013 1014 skb_queue_walk(&tx->skbs, skb) { 1015 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1016 1017 hdr = (void *)skb->data; 1018 info = IEEE80211_SKB_CB(skb); 1019 1020 if (!skb_queue_is_last(&tx->skbs, skb)) { 1021 hdr->frame_control |= morefrags; 1022 /* 1023 * No multi-rate retries for fragmented frames, that 1024 * would completely throw off the NAV at other STAs. 1025 */ 1026 info->control.rates[1].idx = -1; 1027 info->control.rates[2].idx = -1; 1028 info->control.rates[3].idx = -1; 1029 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1030 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1031 } else { 1032 hdr->frame_control &= ~morefrags; 1033 } 1034 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1035 fragnum++; 1036 } 1037 1038 return TX_CONTINUE; 1039 } 1040 1041 static ieee80211_tx_result debug_noinline 1042 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1043 { 1044 struct sk_buff *skb; 1045 int ac = -1; 1046 1047 if (!tx->sta) 1048 return TX_CONTINUE; 1049 1050 skb_queue_walk(&tx->skbs, skb) { 1051 ac = skb_get_queue_mapping(skb); 1052 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1053 } 1054 if (ac >= 0) 1055 tx->sta->deflink.tx_stats.packets[ac]++; 1056 1057 return TX_CONTINUE; 1058 } 1059 1060 static ieee80211_tx_result debug_noinline 1061 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1062 { 1063 if (!tx->key) 1064 return TX_CONTINUE; 1065 1066 switch (tx->key->conf.cipher) { 1067 case WLAN_CIPHER_SUITE_WEP40: 1068 case WLAN_CIPHER_SUITE_WEP104: 1069 return ieee80211_crypto_wep_encrypt(tx); 1070 case WLAN_CIPHER_SUITE_TKIP: 1071 return ieee80211_crypto_tkip_encrypt(tx); 1072 case WLAN_CIPHER_SUITE_CCMP: 1073 return ieee80211_crypto_ccmp_encrypt( 1074 tx, IEEE80211_CCMP_MIC_LEN); 1075 case WLAN_CIPHER_SUITE_CCMP_256: 1076 return ieee80211_crypto_ccmp_encrypt( 1077 tx, IEEE80211_CCMP_256_MIC_LEN); 1078 case WLAN_CIPHER_SUITE_AES_CMAC: 1079 return ieee80211_crypto_aes_cmac_encrypt(tx); 1080 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1081 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1082 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1083 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1084 return ieee80211_crypto_aes_gmac_encrypt(tx); 1085 case WLAN_CIPHER_SUITE_GCMP: 1086 case WLAN_CIPHER_SUITE_GCMP_256: 1087 return ieee80211_crypto_gcmp_encrypt(tx); 1088 } 1089 1090 return TX_DROP; 1091 } 1092 1093 static ieee80211_tx_result debug_noinline 1094 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1095 { 1096 struct sk_buff *skb; 1097 struct ieee80211_hdr *hdr; 1098 int next_len; 1099 bool group_addr; 1100 1101 skb_queue_walk(&tx->skbs, skb) { 1102 hdr = (void *) skb->data; 1103 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1104 break; /* must not overwrite AID */ 1105 if (!skb_queue_is_last(&tx->skbs, skb)) { 1106 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1107 next_len = next->len; 1108 } else 1109 next_len = 0; 1110 group_addr = is_multicast_ether_addr(hdr->addr1); 1111 1112 hdr->duration_id = 1113 ieee80211_duration(tx, skb, group_addr, next_len); 1114 } 1115 1116 return TX_CONTINUE; 1117 } 1118 1119 /* actual transmit path */ 1120 1121 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1122 struct sk_buff *skb, 1123 struct ieee80211_tx_info *info, 1124 struct tid_ampdu_tx *tid_tx, 1125 int tid) 1126 { 1127 bool queued = false; 1128 bool reset_agg_timer = false; 1129 struct sk_buff *purge_skb = NULL; 1130 1131 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1132 reset_agg_timer = true; 1133 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1134 /* 1135 * nothing -- this aggregation session is being started 1136 * but that might still fail with the driver 1137 */ 1138 } else if (!tx->sta->sta.txq[tid]) { 1139 spin_lock(&tx->sta->lock); 1140 /* 1141 * Need to re-check now, because we may get here 1142 * 1143 * 1) in the window during which the setup is actually 1144 * already done, but not marked yet because not all 1145 * packets are spliced over to the driver pending 1146 * queue yet -- if this happened we acquire the lock 1147 * either before or after the splice happens, but 1148 * need to recheck which of these cases happened. 1149 * 1150 * 2) during session teardown, if the OPERATIONAL bit 1151 * was cleared due to the teardown but the pointer 1152 * hasn't been assigned NULL yet (or we loaded it 1153 * before it was assigned) -- in this case it may 1154 * now be NULL which means we should just let the 1155 * packet pass through because splicing the frames 1156 * back is already done. 1157 */ 1158 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1159 1160 if (!tid_tx) { 1161 /* do nothing, let packet pass through */ 1162 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1163 reset_agg_timer = true; 1164 } else { 1165 queued = true; 1166 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1167 clear_sta_flag(tx->sta, WLAN_STA_SP); 1168 ps_dbg(tx->sta->sdata, 1169 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1170 tx->sta->sta.addr, tx->sta->sta.aid); 1171 } 1172 info->control.vif = &tx->sdata->vif; 1173 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1174 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1175 __skb_queue_tail(&tid_tx->pending, skb); 1176 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1177 purge_skb = __skb_dequeue(&tid_tx->pending); 1178 } 1179 spin_unlock(&tx->sta->lock); 1180 1181 if (purge_skb) 1182 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1183 } 1184 1185 /* reset session timer */ 1186 if (reset_agg_timer) 1187 tid_tx->last_tx = jiffies; 1188 1189 return queued; 1190 } 1191 1192 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1193 struct sta_info *sta, struct sk_buff *skb) 1194 { 1195 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1196 u16 tid; 1197 1198 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1199 return; 1200 1201 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1202 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1203 skb->protocol == sdata->control_port_protocol) 1204 return; 1205 1206 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1207 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1208 return; 1209 1210 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1211 } 1212 1213 /* 1214 * initialises @tx 1215 * pass %NULL for the station if unknown, a valid pointer if known 1216 * or an ERR_PTR() if the station is known not to exist 1217 */ 1218 static ieee80211_tx_result 1219 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1220 struct ieee80211_tx_data *tx, 1221 struct sta_info *sta, struct sk_buff *skb) 1222 { 1223 struct ieee80211_local *local = sdata->local; 1224 struct ieee80211_hdr *hdr; 1225 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1226 bool aggr_check = false; 1227 int tid; 1228 1229 memset(tx, 0, sizeof(*tx)); 1230 tx->skb = skb; 1231 tx->local = local; 1232 tx->sdata = sdata; 1233 __skb_queue_head_init(&tx->skbs); 1234 1235 /* 1236 * If this flag is set to true anywhere, and we get here, 1237 * we are doing the needed processing, so remove the flag 1238 * now. 1239 */ 1240 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1241 1242 hdr = (struct ieee80211_hdr *) skb->data; 1243 1244 if (likely(sta)) { 1245 if (!IS_ERR(sta)) 1246 tx->sta = sta; 1247 } else { 1248 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1249 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1250 if (!tx->sta && sdata->wdev.use_4addr) 1251 return TX_DROP; 1252 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1253 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1254 } 1255 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1256 tx->sta = sta_info_get(sdata, hdr->addr1); 1257 aggr_check = true; 1258 } 1259 } 1260 1261 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1262 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1263 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1264 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1265 struct tid_ampdu_tx *tid_tx; 1266 1267 tid = ieee80211_get_tid(hdr); 1268 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1269 if (!tid_tx && aggr_check) { 1270 ieee80211_aggr_check(sdata, tx->sta, skb); 1271 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1272 } 1273 1274 if (tid_tx) { 1275 bool queued; 1276 1277 queued = ieee80211_tx_prep_agg(tx, skb, info, 1278 tid_tx, tid); 1279 1280 if (unlikely(queued)) 1281 return TX_QUEUED; 1282 } 1283 } 1284 1285 if (is_multicast_ether_addr(hdr->addr1)) { 1286 tx->flags &= ~IEEE80211_TX_UNICAST; 1287 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1288 } else 1289 tx->flags |= IEEE80211_TX_UNICAST; 1290 1291 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1292 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1293 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1294 info->flags & IEEE80211_TX_CTL_AMPDU) 1295 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1296 } 1297 1298 if (!tx->sta) 1299 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1300 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1301 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1302 ieee80211_check_fast_xmit(tx->sta); 1303 } 1304 1305 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1306 1307 return TX_CONTINUE; 1308 } 1309 1310 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1311 struct ieee80211_vif *vif, 1312 struct sta_info *sta, 1313 struct sk_buff *skb) 1314 { 1315 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1316 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1317 struct ieee80211_txq *txq = NULL; 1318 1319 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1320 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1321 return NULL; 1322 1323 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1324 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1325 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1326 ieee80211_is_bufferable_mmpdu(skb) || 1327 vif->type == NL80211_IFTYPE_STATION) && 1328 sta && sta->uploaded) { 1329 /* 1330 * This will be NULL if the driver didn't set the 1331 * opt-in hardware flag. 1332 */ 1333 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1334 } 1335 } else if (sta) { 1336 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1337 1338 if (!sta->uploaded) 1339 return NULL; 1340 1341 txq = sta->sta.txq[tid]; 1342 } else { 1343 txq = vif->txq; 1344 } 1345 1346 if (!txq) 1347 return NULL; 1348 1349 return to_txq_info(txq); 1350 } 1351 1352 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1353 { 1354 struct sk_buff *next; 1355 codel_time_t now = codel_get_time(); 1356 1357 skb_list_walk_safe(skb, skb, next) 1358 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1359 } 1360 1361 static u32 codel_skb_len_func(const struct sk_buff *skb) 1362 { 1363 return skb->len; 1364 } 1365 1366 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1367 { 1368 const struct ieee80211_tx_info *info; 1369 1370 info = (const struct ieee80211_tx_info *)skb->cb; 1371 return info->control.enqueue_time; 1372 } 1373 1374 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1375 void *ctx) 1376 { 1377 struct ieee80211_local *local; 1378 struct txq_info *txqi; 1379 struct fq *fq; 1380 struct fq_flow *flow; 1381 1382 txqi = ctx; 1383 local = vif_to_sdata(txqi->txq.vif)->local; 1384 fq = &local->fq; 1385 1386 if (cvars == &txqi->def_cvars) 1387 flow = &txqi->tin.default_flow; 1388 else 1389 flow = &fq->flows[cvars - local->cvars]; 1390 1391 return fq_flow_dequeue(fq, flow); 1392 } 1393 1394 static void codel_drop_func(struct sk_buff *skb, 1395 void *ctx) 1396 { 1397 struct ieee80211_local *local; 1398 struct ieee80211_hw *hw; 1399 struct txq_info *txqi; 1400 1401 txqi = ctx; 1402 local = vif_to_sdata(txqi->txq.vif)->local; 1403 hw = &local->hw; 1404 1405 ieee80211_free_txskb(hw, skb); 1406 } 1407 1408 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1409 struct fq_tin *tin, 1410 struct fq_flow *flow) 1411 { 1412 struct ieee80211_local *local; 1413 struct txq_info *txqi; 1414 struct codel_vars *cvars; 1415 struct codel_params *cparams; 1416 struct codel_stats *cstats; 1417 1418 local = container_of(fq, struct ieee80211_local, fq); 1419 txqi = container_of(tin, struct txq_info, tin); 1420 cstats = &txqi->cstats; 1421 1422 if (txqi->txq.sta) { 1423 struct sta_info *sta = container_of(txqi->txq.sta, 1424 struct sta_info, sta); 1425 cparams = &sta->cparams; 1426 } else { 1427 cparams = &local->cparams; 1428 } 1429 1430 if (flow == &tin->default_flow) 1431 cvars = &txqi->def_cvars; 1432 else 1433 cvars = &local->cvars[flow - fq->flows]; 1434 1435 return codel_dequeue(txqi, 1436 &flow->backlog, 1437 cparams, 1438 cvars, 1439 cstats, 1440 codel_skb_len_func, 1441 codel_skb_time_func, 1442 codel_drop_func, 1443 codel_dequeue_func); 1444 } 1445 1446 static void fq_skb_free_func(struct fq *fq, 1447 struct fq_tin *tin, 1448 struct fq_flow *flow, 1449 struct sk_buff *skb) 1450 { 1451 struct ieee80211_local *local; 1452 1453 local = container_of(fq, struct ieee80211_local, fq); 1454 ieee80211_free_txskb(&local->hw, skb); 1455 } 1456 1457 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1458 struct txq_info *txqi, 1459 struct sk_buff *skb) 1460 { 1461 struct fq *fq = &local->fq; 1462 struct fq_tin *tin = &txqi->tin; 1463 u32 flow_idx = fq_flow_idx(fq, skb); 1464 1465 ieee80211_set_skb_enqueue_time(skb); 1466 1467 spin_lock_bh(&fq->lock); 1468 /* 1469 * For management frames, don't really apply codel etc., 1470 * we don't want to apply any shaping or anything we just 1471 * want to simplify the driver API by having them on the 1472 * txqi. 1473 */ 1474 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1475 IEEE80211_SKB_CB(skb)->control.flags |= 1476 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1477 __skb_queue_tail(&txqi->frags, skb); 1478 } else { 1479 fq_tin_enqueue(fq, tin, flow_idx, skb, 1480 fq_skb_free_func); 1481 } 1482 spin_unlock_bh(&fq->lock); 1483 } 1484 1485 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1486 struct fq_flow *flow, struct sk_buff *skb, 1487 void *data) 1488 { 1489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1490 1491 return info->control.vif == data; 1492 } 1493 1494 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1495 struct ieee80211_sub_if_data *sdata) 1496 { 1497 struct fq *fq = &local->fq; 1498 struct txq_info *txqi; 1499 struct fq_tin *tin; 1500 struct ieee80211_sub_if_data *ap; 1501 1502 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1503 return; 1504 1505 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1506 1507 if (!ap->vif.txq) 1508 return; 1509 1510 txqi = to_txq_info(ap->vif.txq); 1511 tin = &txqi->tin; 1512 1513 spin_lock_bh(&fq->lock); 1514 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1515 fq_skb_free_func); 1516 spin_unlock_bh(&fq->lock); 1517 } 1518 1519 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1520 struct sta_info *sta, 1521 struct txq_info *txqi, int tid) 1522 { 1523 fq_tin_init(&txqi->tin); 1524 codel_vars_init(&txqi->def_cvars); 1525 codel_stats_init(&txqi->cstats); 1526 __skb_queue_head_init(&txqi->frags); 1527 INIT_LIST_HEAD(&txqi->schedule_order); 1528 1529 txqi->txq.vif = &sdata->vif; 1530 1531 if (!sta) { 1532 sdata->vif.txq = &txqi->txq; 1533 txqi->txq.tid = 0; 1534 txqi->txq.ac = IEEE80211_AC_BE; 1535 1536 return; 1537 } 1538 1539 if (tid == IEEE80211_NUM_TIDS) { 1540 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1541 /* Drivers need to opt in to the management MPDU TXQ */ 1542 if (!ieee80211_hw_check(&sdata->local->hw, 1543 STA_MMPDU_TXQ)) 1544 return; 1545 } else if (!ieee80211_hw_check(&sdata->local->hw, 1546 BUFF_MMPDU_TXQ)) { 1547 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1548 return; 1549 } 1550 txqi->txq.ac = IEEE80211_AC_VO; 1551 } else { 1552 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1553 } 1554 1555 txqi->txq.sta = &sta->sta; 1556 txqi->txq.tid = tid; 1557 sta->sta.txq[tid] = &txqi->txq; 1558 } 1559 1560 void ieee80211_txq_purge(struct ieee80211_local *local, 1561 struct txq_info *txqi) 1562 { 1563 struct fq *fq = &local->fq; 1564 struct fq_tin *tin = &txqi->tin; 1565 1566 spin_lock_bh(&fq->lock); 1567 fq_tin_reset(fq, tin, fq_skb_free_func); 1568 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1569 spin_unlock_bh(&fq->lock); 1570 1571 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1572 list_del_init(&txqi->schedule_order); 1573 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1574 } 1575 1576 void ieee80211_txq_set_params(struct ieee80211_local *local) 1577 { 1578 if (local->hw.wiphy->txq_limit) 1579 local->fq.limit = local->hw.wiphy->txq_limit; 1580 else 1581 local->hw.wiphy->txq_limit = local->fq.limit; 1582 1583 if (local->hw.wiphy->txq_memory_limit) 1584 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1585 else 1586 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1587 1588 if (local->hw.wiphy->txq_quantum) 1589 local->fq.quantum = local->hw.wiphy->txq_quantum; 1590 else 1591 local->hw.wiphy->txq_quantum = local->fq.quantum; 1592 } 1593 1594 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1595 { 1596 struct fq *fq = &local->fq; 1597 int ret; 1598 int i; 1599 bool supp_vht = false; 1600 enum nl80211_band band; 1601 1602 ret = fq_init(fq, 4096); 1603 if (ret) 1604 return ret; 1605 1606 /* 1607 * If the hardware doesn't support VHT, it is safe to limit the maximum 1608 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1609 */ 1610 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1611 struct ieee80211_supported_band *sband; 1612 1613 sband = local->hw.wiphy->bands[band]; 1614 if (!sband) 1615 continue; 1616 1617 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1618 } 1619 1620 if (!supp_vht) 1621 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1622 1623 codel_params_init(&local->cparams); 1624 local->cparams.interval = MS2TIME(100); 1625 local->cparams.target = MS2TIME(20); 1626 local->cparams.ecn = true; 1627 1628 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1629 GFP_KERNEL); 1630 if (!local->cvars) { 1631 spin_lock_bh(&fq->lock); 1632 fq_reset(fq, fq_skb_free_func); 1633 spin_unlock_bh(&fq->lock); 1634 return -ENOMEM; 1635 } 1636 1637 for (i = 0; i < fq->flows_cnt; i++) 1638 codel_vars_init(&local->cvars[i]); 1639 1640 ieee80211_txq_set_params(local); 1641 1642 return 0; 1643 } 1644 1645 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1646 { 1647 struct fq *fq = &local->fq; 1648 1649 kfree(local->cvars); 1650 local->cvars = NULL; 1651 1652 spin_lock_bh(&fq->lock); 1653 fq_reset(fq, fq_skb_free_func); 1654 spin_unlock_bh(&fq->lock); 1655 } 1656 1657 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1658 struct ieee80211_sub_if_data *sdata, 1659 struct sta_info *sta, 1660 struct sk_buff *skb) 1661 { 1662 struct ieee80211_vif *vif; 1663 struct txq_info *txqi; 1664 1665 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1666 return false; 1667 1668 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1669 sdata = container_of(sdata->bss, 1670 struct ieee80211_sub_if_data, u.ap); 1671 1672 vif = &sdata->vif; 1673 txqi = ieee80211_get_txq(local, vif, sta, skb); 1674 1675 if (!txqi) 1676 return false; 1677 1678 ieee80211_txq_enqueue(local, txqi, skb); 1679 1680 schedule_and_wake_txq(local, txqi); 1681 1682 return true; 1683 } 1684 1685 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1686 struct ieee80211_vif *vif, 1687 struct sta_info *sta, 1688 struct sk_buff_head *skbs, 1689 bool txpending) 1690 { 1691 struct ieee80211_tx_control control = {}; 1692 struct sk_buff *skb, *tmp; 1693 unsigned long flags; 1694 1695 skb_queue_walk_safe(skbs, skb, tmp) { 1696 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1697 int q = info->hw_queue; 1698 1699 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1700 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1701 __skb_unlink(skb, skbs); 1702 ieee80211_free_txskb(&local->hw, skb); 1703 continue; 1704 } 1705 #endif 1706 1707 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1708 if (local->queue_stop_reasons[q] || 1709 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1710 if (unlikely(info->flags & 1711 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1712 if (local->queue_stop_reasons[q] & 1713 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1714 /* 1715 * Drop off-channel frames if queues 1716 * are stopped for any reason other 1717 * than off-channel operation. Never 1718 * queue them. 1719 */ 1720 spin_unlock_irqrestore( 1721 &local->queue_stop_reason_lock, 1722 flags); 1723 ieee80211_purge_tx_queue(&local->hw, 1724 skbs); 1725 return true; 1726 } 1727 } else { 1728 1729 /* 1730 * Since queue is stopped, queue up frames for 1731 * later transmission from the tx-pending 1732 * tasklet when the queue is woken again. 1733 */ 1734 if (txpending) 1735 skb_queue_splice_init(skbs, 1736 &local->pending[q]); 1737 else 1738 skb_queue_splice_tail_init(skbs, 1739 &local->pending[q]); 1740 1741 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1742 flags); 1743 return false; 1744 } 1745 } 1746 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1747 1748 info->control.vif = vif; 1749 control.sta = sta ? &sta->sta : NULL; 1750 1751 __skb_unlink(skb, skbs); 1752 drv_tx(local, &control, skb); 1753 } 1754 1755 return true; 1756 } 1757 1758 /* 1759 * Returns false if the frame couldn't be transmitted but was queued instead. 1760 */ 1761 static bool __ieee80211_tx(struct ieee80211_local *local, 1762 struct sk_buff_head *skbs, struct sta_info *sta, 1763 bool txpending) 1764 { 1765 struct ieee80211_tx_info *info; 1766 struct ieee80211_sub_if_data *sdata; 1767 struct ieee80211_vif *vif; 1768 struct sk_buff *skb; 1769 bool result; 1770 1771 if (WARN_ON(skb_queue_empty(skbs))) 1772 return true; 1773 1774 skb = skb_peek(skbs); 1775 info = IEEE80211_SKB_CB(skb); 1776 sdata = vif_to_sdata(info->control.vif); 1777 if (sta && !sta->uploaded) 1778 sta = NULL; 1779 1780 switch (sdata->vif.type) { 1781 case NL80211_IFTYPE_MONITOR: 1782 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1783 vif = &sdata->vif; 1784 break; 1785 } 1786 sdata = rcu_dereference(local->monitor_sdata); 1787 if (sdata) { 1788 vif = &sdata->vif; 1789 info->hw_queue = 1790 vif->hw_queue[skb_get_queue_mapping(skb)]; 1791 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1792 ieee80211_purge_tx_queue(&local->hw, skbs); 1793 return true; 1794 } else 1795 vif = NULL; 1796 break; 1797 case NL80211_IFTYPE_AP_VLAN: 1798 sdata = container_of(sdata->bss, 1799 struct ieee80211_sub_if_data, u.ap); 1800 fallthrough; 1801 default: 1802 vif = &sdata->vif; 1803 break; 1804 } 1805 1806 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1807 1808 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1809 1810 return result; 1811 } 1812 1813 /* 1814 * Invoke TX handlers, return 0 on success and non-zero if the 1815 * frame was dropped or queued. 1816 * 1817 * The handlers are split into an early and late part. The latter is everything 1818 * that can be sensitive to reordering, and will be deferred to after packets 1819 * are dequeued from the intermediate queues (when they are enabled). 1820 */ 1821 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1822 { 1823 ieee80211_tx_result res = TX_DROP; 1824 1825 #define CALL_TXH(txh) \ 1826 do { \ 1827 res = txh(tx); \ 1828 if (res != TX_CONTINUE) \ 1829 goto txh_done; \ 1830 } while (0) 1831 1832 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1833 CALL_TXH(ieee80211_tx_h_check_assoc); 1834 CALL_TXH(ieee80211_tx_h_ps_buf); 1835 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1836 CALL_TXH(ieee80211_tx_h_select_key); 1837 1838 txh_done: 1839 if (unlikely(res == TX_DROP)) { 1840 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1841 if (tx->skb) 1842 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1843 else 1844 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1845 return -1; 1846 } else if (unlikely(res == TX_QUEUED)) { 1847 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1848 return -1; 1849 } 1850 1851 return 0; 1852 } 1853 1854 /* 1855 * Late handlers can be called while the sta lock is held. Handlers that can 1856 * cause packets to be generated will cause deadlock! 1857 */ 1858 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1859 { 1860 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1861 ieee80211_tx_result res = TX_CONTINUE; 1862 1863 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1864 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1865 1866 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1867 __skb_queue_tail(&tx->skbs, tx->skb); 1868 tx->skb = NULL; 1869 goto txh_done; 1870 } 1871 1872 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1873 CALL_TXH(ieee80211_tx_h_sequence); 1874 CALL_TXH(ieee80211_tx_h_fragment); 1875 /* handlers after fragment must be aware of tx info fragmentation! */ 1876 CALL_TXH(ieee80211_tx_h_stats); 1877 CALL_TXH(ieee80211_tx_h_encrypt); 1878 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1879 CALL_TXH(ieee80211_tx_h_calculate_duration); 1880 #undef CALL_TXH 1881 1882 txh_done: 1883 if (unlikely(res == TX_DROP)) { 1884 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1885 if (tx->skb) 1886 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1887 else 1888 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1889 return -1; 1890 } else if (unlikely(res == TX_QUEUED)) { 1891 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1892 return -1; 1893 } 1894 1895 return 0; 1896 } 1897 1898 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1899 { 1900 int r = invoke_tx_handlers_early(tx); 1901 1902 if (r) 1903 return r; 1904 return invoke_tx_handlers_late(tx); 1905 } 1906 1907 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1908 struct ieee80211_vif *vif, struct sk_buff *skb, 1909 int band, struct ieee80211_sta **sta) 1910 { 1911 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1912 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1913 struct ieee80211_tx_data tx; 1914 struct sk_buff *skb2; 1915 1916 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1917 return false; 1918 1919 info->band = band; 1920 info->control.vif = vif; 1921 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1922 1923 if (invoke_tx_handlers(&tx)) 1924 return false; 1925 1926 if (sta) { 1927 if (tx.sta) 1928 *sta = &tx.sta->sta; 1929 else 1930 *sta = NULL; 1931 } 1932 1933 /* this function isn't suitable for fragmented data frames */ 1934 skb2 = __skb_dequeue(&tx.skbs); 1935 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1936 ieee80211_free_txskb(hw, skb2); 1937 ieee80211_purge_tx_queue(hw, &tx.skbs); 1938 return false; 1939 } 1940 1941 return true; 1942 } 1943 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1944 1945 /* 1946 * Returns false if the frame couldn't be transmitted but was queued instead. 1947 */ 1948 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1949 struct sta_info *sta, struct sk_buff *skb, 1950 bool txpending) 1951 { 1952 struct ieee80211_local *local = sdata->local; 1953 struct ieee80211_tx_data tx; 1954 ieee80211_tx_result res_prepare; 1955 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1956 bool result = true; 1957 1958 if (unlikely(skb->len < 10)) { 1959 dev_kfree_skb(skb); 1960 return true; 1961 } 1962 1963 /* initialises tx */ 1964 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1965 1966 if (unlikely(res_prepare == TX_DROP)) { 1967 ieee80211_free_txskb(&local->hw, skb); 1968 return true; 1969 } else if (unlikely(res_prepare == TX_QUEUED)) { 1970 return true; 1971 } 1972 1973 /* set up hw_queue value early */ 1974 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1975 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1976 info->hw_queue = 1977 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1978 1979 if (invoke_tx_handlers_early(&tx)) 1980 return true; 1981 1982 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1983 return true; 1984 1985 if (!invoke_tx_handlers_late(&tx)) 1986 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1987 1988 return result; 1989 } 1990 1991 /* device xmit handlers */ 1992 1993 enum ieee80211_encrypt { 1994 ENCRYPT_NO, 1995 ENCRYPT_MGMT, 1996 ENCRYPT_DATA, 1997 }; 1998 1999 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 2000 struct sk_buff *skb, 2001 int head_need, 2002 enum ieee80211_encrypt encrypt) 2003 { 2004 struct ieee80211_local *local = sdata->local; 2005 bool enc_tailroom; 2006 int tail_need = 0; 2007 2008 enc_tailroom = encrypt == ENCRYPT_MGMT || 2009 (encrypt == ENCRYPT_DATA && 2010 sdata->crypto_tx_tailroom_needed_cnt); 2011 2012 if (enc_tailroom) { 2013 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2014 tail_need -= skb_tailroom(skb); 2015 tail_need = max_t(int, tail_need, 0); 2016 } 2017 2018 if (skb_cloned(skb) && 2019 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2020 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2021 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2022 else if (head_need || tail_need) 2023 I802_DEBUG_INC(local->tx_expand_skb_head); 2024 else 2025 return 0; 2026 2027 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2028 wiphy_debug(local->hw.wiphy, 2029 "failed to reallocate TX buffer\n"); 2030 return -ENOMEM; 2031 } 2032 2033 return 0; 2034 } 2035 2036 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2037 struct sta_info *sta, struct sk_buff *skb) 2038 { 2039 struct ieee80211_local *local = sdata->local; 2040 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2041 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2042 int headroom; 2043 enum ieee80211_encrypt encrypt; 2044 2045 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2046 encrypt = ENCRYPT_NO; 2047 else if (ieee80211_is_mgmt(hdr->frame_control)) 2048 encrypt = ENCRYPT_MGMT; 2049 else 2050 encrypt = ENCRYPT_DATA; 2051 2052 headroom = local->tx_headroom; 2053 if (encrypt != ENCRYPT_NO) 2054 headroom += IEEE80211_ENCRYPT_HEADROOM; 2055 headroom -= skb_headroom(skb); 2056 headroom = max_t(int, 0, headroom); 2057 2058 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2059 ieee80211_free_txskb(&local->hw, skb); 2060 return; 2061 } 2062 2063 /* reload after potential resize */ 2064 hdr = (struct ieee80211_hdr *) skb->data; 2065 info->control.vif = &sdata->vif; 2066 2067 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2068 if (ieee80211_is_data(hdr->frame_control) && 2069 is_unicast_ether_addr(hdr->addr1)) { 2070 if (mesh_nexthop_resolve(sdata, skb)) 2071 return; /* skb queued: don't free */ 2072 } else { 2073 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2074 } 2075 } 2076 2077 ieee80211_set_qos_hdr(sdata, skb); 2078 ieee80211_tx(sdata, sta, skb, false); 2079 } 2080 2081 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2082 { 2083 struct ieee80211_radiotap_header *rthdr = 2084 (struct ieee80211_radiotap_header *)skb->data; 2085 2086 /* check for not even having the fixed radiotap header part */ 2087 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2088 return false; /* too short to be possibly valid */ 2089 2090 /* is it a header version we can trust to find length from? */ 2091 if (unlikely(rthdr->it_version)) 2092 return false; /* only version 0 is supported */ 2093 2094 /* does the skb contain enough to deliver on the alleged length? */ 2095 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2096 return false; /* skb too short for claimed rt header extent */ 2097 2098 return true; 2099 } 2100 2101 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2102 struct net_device *dev) 2103 { 2104 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2105 struct ieee80211_radiotap_iterator iterator; 2106 struct ieee80211_radiotap_header *rthdr = 2107 (struct ieee80211_radiotap_header *) skb->data; 2108 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2109 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2110 NULL); 2111 u16 txflags; 2112 u16 rate = 0; 2113 bool rate_found = false; 2114 u8 rate_retries = 0; 2115 u16 rate_flags = 0; 2116 u8 mcs_known, mcs_flags, mcs_bw; 2117 u16 vht_known; 2118 u8 vht_mcs = 0, vht_nss = 0; 2119 int i; 2120 2121 if (!ieee80211_validate_radiotap_len(skb)) 2122 return false; 2123 2124 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2125 IEEE80211_TX_CTL_DONTFRAG; 2126 2127 /* 2128 * for every radiotap entry that is present 2129 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2130 * entries present, or -EINVAL on error) 2131 */ 2132 2133 while (!ret) { 2134 ret = ieee80211_radiotap_iterator_next(&iterator); 2135 2136 if (ret) 2137 continue; 2138 2139 /* see if this argument is something we can use */ 2140 switch (iterator.this_arg_index) { 2141 /* 2142 * You must take care when dereferencing iterator.this_arg 2143 * for multibyte types... the pointer is not aligned. Use 2144 * get_unaligned((type *)iterator.this_arg) to dereference 2145 * iterator.this_arg for type "type" safely on all arches. 2146 */ 2147 case IEEE80211_RADIOTAP_FLAGS: 2148 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2149 /* 2150 * this indicates that the skb we have been 2151 * handed has the 32-bit FCS CRC at the end... 2152 * we should react to that by snipping it off 2153 * because it will be recomputed and added 2154 * on transmission 2155 */ 2156 if (skb->len < (iterator._max_length + FCS_LEN)) 2157 return false; 2158 2159 skb_trim(skb, skb->len - FCS_LEN); 2160 } 2161 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2162 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2163 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2164 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2165 break; 2166 2167 case IEEE80211_RADIOTAP_TX_FLAGS: 2168 txflags = get_unaligned_le16(iterator.this_arg); 2169 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2170 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2171 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2172 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2173 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2174 info->control.flags |= 2175 IEEE80211_TX_CTRL_DONT_REORDER; 2176 break; 2177 2178 case IEEE80211_RADIOTAP_RATE: 2179 rate = *iterator.this_arg; 2180 rate_flags = 0; 2181 rate_found = true; 2182 break; 2183 2184 case IEEE80211_RADIOTAP_DATA_RETRIES: 2185 rate_retries = *iterator.this_arg; 2186 break; 2187 2188 case IEEE80211_RADIOTAP_MCS: 2189 mcs_known = iterator.this_arg[0]; 2190 mcs_flags = iterator.this_arg[1]; 2191 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2192 break; 2193 2194 rate_found = true; 2195 rate = iterator.this_arg[2]; 2196 rate_flags = IEEE80211_TX_RC_MCS; 2197 2198 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2199 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2200 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2201 2202 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2203 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2204 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2205 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2206 2207 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2208 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2209 info->flags |= IEEE80211_TX_CTL_LDPC; 2210 2211 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2212 u8 stbc = u8_get_bits(mcs_flags, 2213 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2214 2215 info->flags |= 2216 u32_encode_bits(stbc, 2217 IEEE80211_TX_CTL_STBC); 2218 } 2219 break; 2220 2221 case IEEE80211_RADIOTAP_VHT: 2222 vht_known = get_unaligned_le16(iterator.this_arg); 2223 rate_found = true; 2224 2225 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2226 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2227 (iterator.this_arg[2] & 2228 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2229 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2230 if (vht_known & 2231 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2232 if (iterator.this_arg[3] == 1) 2233 rate_flags |= 2234 IEEE80211_TX_RC_40_MHZ_WIDTH; 2235 else if (iterator.this_arg[3] == 4) 2236 rate_flags |= 2237 IEEE80211_TX_RC_80_MHZ_WIDTH; 2238 else if (iterator.this_arg[3] == 11) 2239 rate_flags |= 2240 IEEE80211_TX_RC_160_MHZ_WIDTH; 2241 } 2242 2243 vht_mcs = iterator.this_arg[4] >> 4; 2244 if (vht_mcs > 11) 2245 vht_mcs = 0; 2246 vht_nss = iterator.this_arg[4] & 0xF; 2247 if (!vht_nss || vht_nss > 8) 2248 vht_nss = 1; 2249 break; 2250 2251 /* 2252 * Please update the file 2253 * Documentation/networking/mac80211-injection.rst 2254 * when parsing new fields here. 2255 */ 2256 2257 default: 2258 break; 2259 } 2260 } 2261 2262 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2263 return false; 2264 2265 if (rate_found) { 2266 struct ieee80211_supported_band *sband = 2267 local->hw.wiphy->bands[info->band]; 2268 2269 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2270 2271 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2272 info->control.rates[i].idx = -1; 2273 info->control.rates[i].flags = 0; 2274 info->control.rates[i].count = 0; 2275 } 2276 2277 if (rate_flags & IEEE80211_TX_RC_MCS) { 2278 info->control.rates[0].idx = rate; 2279 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2280 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2281 vht_nss); 2282 } else if (sband) { 2283 for (i = 0; i < sband->n_bitrates; i++) { 2284 if (rate * 5 != sband->bitrates[i].bitrate) 2285 continue; 2286 2287 info->control.rates[0].idx = i; 2288 break; 2289 } 2290 } 2291 2292 if (info->control.rates[0].idx < 0) 2293 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2294 2295 info->control.rates[0].flags = rate_flags; 2296 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2297 local->hw.max_rate_tries); 2298 } 2299 2300 return true; 2301 } 2302 2303 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2304 struct net_device *dev) 2305 { 2306 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2307 struct ieee80211_chanctx_conf *chanctx_conf; 2308 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2309 struct ieee80211_hdr *hdr; 2310 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2311 struct cfg80211_chan_def *chandef; 2312 u16 len_rthdr; 2313 int hdrlen; 2314 2315 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2316 if (unlikely(!ieee80211_sdata_running(sdata))) 2317 goto fail; 2318 2319 memset(info, 0, sizeof(*info)); 2320 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2321 IEEE80211_TX_CTL_INJECTED; 2322 2323 /* Sanity-check the length of the radiotap header */ 2324 if (!ieee80211_validate_radiotap_len(skb)) 2325 goto fail; 2326 2327 /* we now know there is a radiotap header with a length we can use */ 2328 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2329 2330 /* 2331 * fix up the pointers accounting for the radiotap 2332 * header still being in there. We are being given 2333 * a precooked IEEE80211 header so no need for 2334 * normal processing 2335 */ 2336 skb_set_mac_header(skb, len_rthdr); 2337 /* 2338 * these are just fixed to the end of the rt area since we 2339 * don't have any better information and at this point, nobody cares 2340 */ 2341 skb_set_network_header(skb, len_rthdr); 2342 skb_set_transport_header(skb, len_rthdr); 2343 2344 if (skb->len < len_rthdr + 2) 2345 goto fail; 2346 2347 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2348 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2349 2350 if (skb->len < len_rthdr + hdrlen) 2351 goto fail; 2352 2353 /* 2354 * Initialize skb->protocol if the injected frame is a data frame 2355 * carrying a rfc1042 header 2356 */ 2357 if (ieee80211_is_data(hdr->frame_control) && 2358 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2359 u8 *payload = (u8 *)hdr + hdrlen; 2360 2361 if (ether_addr_equal(payload, rfc1042_header)) 2362 skb->protocol = cpu_to_be16((payload[6] << 8) | 2363 payload[7]); 2364 } 2365 2366 rcu_read_lock(); 2367 2368 /* 2369 * We process outgoing injected frames that have a local address 2370 * we handle as though they are non-injected frames. 2371 * This code here isn't entirely correct, the local MAC address 2372 * isn't always enough to find the interface to use; for proper 2373 * VLAN support we have an nl80211-based mechanism. 2374 * 2375 * This is necessary, for example, for old hostapd versions that 2376 * don't use nl80211-based management TX/RX. 2377 */ 2378 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2379 if (!ieee80211_sdata_running(tmp_sdata)) 2380 continue; 2381 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2382 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2383 continue; 2384 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2385 sdata = tmp_sdata; 2386 break; 2387 } 2388 } 2389 2390 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2391 if (!chanctx_conf) { 2392 tmp_sdata = rcu_dereference(local->monitor_sdata); 2393 if (tmp_sdata) 2394 chanctx_conf = 2395 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2396 } 2397 2398 if (chanctx_conf) 2399 chandef = &chanctx_conf->def; 2400 else if (!local->use_chanctx) 2401 chandef = &local->_oper_chandef; 2402 else 2403 goto fail_rcu; 2404 2405 /* 2406 * Frame injection is not allowed if beaconing is not allowed 2407 * or if we need radar detection. Beaconing is usually not allowed when 2408 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2409 * Passive scan is also used in world regulatory domains where 2410 * your country is not known and as such it should be treated as 2411 * NO TX unless the channel is explicitly allowed in which case 2412 * your current regulatory domain would not have the passive scan 2413 * flag. 2414 * 2415 * Since AP mode uses monitor interfaces to inject/TX management 2416 * frames we can make AP mode the exception to this rule once it 2417 * supports radar detection as its implementation can deal with 2418 * radar detection by itself. We can do that later by adding a 2419 * monitor flag interfaces used for AP support. 2420 */ 2421 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2422 sdata->vif.type)) 2423 goto fail_rcu; 2424 2425 info->band = chandef->chan->band; 2426 2427 /* Initialize skb->priority according to frame type and TID class, 2428 * with respect to the sub interface that the frame will actually 2429 * be transmitted on. If the DONT_REORDER flag is set, the original 2430 * skb-priority is preserved to assure frames injected with this 2431 * flag are not reordered relative to each other. 2432 */ 2433 ieee80211_select_queue_80211(sdata, skb, hdr); 2434 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2435 2436 /* 2437 * Process the radiotap header. This will now take into account the 2438 * selected chandef above to accurately set injection rates and 2439 * retransmissions. 2440 */ 2441 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2442 goto fail_rcu; 2443 2444 /* remove the injection radiotap header */ 2445 skb_pull(skb, len_rthdr); 2446 2447 ieee80211_xmit(sdata, NULL, skb); 2448 rcu_read_unlock(); 2449 2450 return NETDEV_TX_OK; 2451 2452 fail_rcu: 2453 rcu_read_unlock(); 2454 fail: 2455 dev_kfree_skb(skb); 2456 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2457 } 2458 2459 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2460 { 2461 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2462 2463 return ethertype == ETH_P_TDLS && 2464 skb->len > 14 && 2465 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2466 } 2467 2468 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2469 struct sk_buff *skb, 2470 struct sta_info **sta_out) 2471 { 2472 struct sta_info *sta; 2473 2474 switch (sdata->vif.type) { 2475 case NL80211_IFTYPE_AP_VLAN: 2476 sta = rcu_dereference(sdata->u.vlan.sta); 2477 if (sta) { 2478 *sta_out = sta; 2479 return 0; 2480 } else if (sdata->wdev.use_4addr) { 2481 return -ENOLINK; 2482 } 2483 fallthrough; 2484 case NL80211_IFTYPE_AP: 2485 case NL80211_IFTYPE_OCB: 2486 case NL80211_IFTYPE_ADHOC: 2487 if (is_multicast_ether_addr(skb->data)) { 2488 *sta_out = ERR_PTR(-ENOENT); 2489 return 0; 2490 } 2491 sta = sta_info_get_bss(sdata, skb->data); 2492 break; 2493 #ifdef CONFIG_MAC80211_MESH 2494 case NL80211_IFTYPE_MESH_POINT: 2495 /* determined much later */ 2496 *sta_out = NULL; 2497 return 0; 2498 #endif 2499 case NL80211_IFTYPE_STATION: 2500 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2501 sta = sta_info_get(sdata, skb->data); 2502 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2503 if (test_sta_flag(sta, 2504 WLAN_STA_TDLS_PEER_AUTH)) { 2505 *sta_out = sta; 2506 return 0; 2507 } 2508 2509 /* 2510 * TDLS link during setup - throw out frames to 2511 * peer. Allow TDLS-setup frames to unauthorized 2512 * peers for the special case of a link teardown 2513 * after a TDLS sta is removed due to being 2514 * unreachable. 2515 */ 2516 if (!ieee80211_is_tdls_setup(skb)) 2517 return -EINVAL; 2518 } 2519 2520 } 2521 2522 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2523 if (!sta) 2524 return -ENOLINK; 2525 break; 2526 default: 2527 return -EINVAL; 2528 } 2529 2530 *sta_out = sta ?: ERR_PTR(-ENOENT); 2531 return 0; 2532 } 2533 2534 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2535 struct sk_buff *skb, 2536 u32 *info_flags, 2537 u64 *cookie) 2538 { 2539 struct sk_buff *ack_skb; 2540 u16 info_id = 0; 2541 2542 if (skb->sk) 2543 ack_skb = skb_clone_sk(skb); 2544 else 2545 ack_skb = skb_clone(skb, GFP_ATOMIC); 2546 2547 if (ack_skb) { 2548 unsigned long flags; 2549 int id; 2550 2551 spin_lock_irqsave(&local->ack_status_lock, flags); 2552 id = idr_alloc(&local->ack_status_frames, ack_skb, 2553 1, 0x2000, GFP_ATOMIC); 2554 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2555 2556 if (id >= 0) { 2557 info_id = id; 2558 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2559 if (cookie) { 2560 *cookie = ieee80211_mgmt_tx_cookie(local); 2561 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2562 } 2563 } else { 2564 kfree_skb(ack_skb); 2565 } 2566 } 2567 2568 return info_id; 2569 } 2570 2571 /** 2572 * ieee80211_build_hdr - build 802.11 header in the given frame 2573 * @sdata: virtual interface to build the header for 2574 * @skb: the skb to build the header in 2575 * @info_flags: skb flags to set 2576 * @sta: the station pointer 2577 * @ctrl_flags: info control flags to set 2578 * @cookie: cookie pointer to fill (if not %NULL) 2579 * 2580 * This function takes the skb with 802.3 header and reformats the header to 2581 * the appropriate IEEE 802.11 header based on which interface the packet is 2582 * being transmitted on. 2583 * 2584 * Note that this function also takes care of the TX status request and 2585 * potential unsharing of the SKB - this needs to be interleaved with the 2586 * header building. 2587 * 2588 * The function requires the read-side RCU lock held 2589 * 2590 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2591 */ 2592 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2593 struct sk_buff *skb, u32 info_flags, 2594 struct sta_info *sta, u32 ctrl_flags, 2595 u64 *cookie) 2596 { 2597 struct ieee80211_local *local = sdata->local; 2598 struct ieee80211_tx_info *info; 2599 int head_need; 2600 u16 ethertype, hdrlen, meshhdrlen = 0; 2601 __le16 fc; 2602 struct ieee80211_hdr hdr; 2603 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2604 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2605 const u8 *encaps_data; 2606 int encaps_len, skip_header_bytes; 2607 bool wme_sta = false, authorized = false; 2608 bool tdls_peer; 2609 bool multicast; 2610 u16 info_id = 0; 2611 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2612 enum nl80211_band band; 2613 int ret; 2614 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2615 2616 if (IS_ERR(sta)) 2617 sta = NULL; 2618 2619 #ifdef CONFIG_MAC80211_DEBUGFS 2620 if (local->force_tx_status) 2621 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2622 #endif 2623 2624 /* convert Ethernet header to proper 802.11 header (based on 2625 * operation mode) */ 2626 ethertype = (skb->data[12] << 8) | skb->data[13]; 2627 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2628 2629 if (!sdata->vif.valid_links) 2630 chanctx_conf = 2631 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2632 2633 switch (sdata->vif.type) { 2634 case NL80211_IFTYPE_AP_VLAN: 2635 if (sdata->wdev.use_4addr) { 2636 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2637 /* RA TA DA SA */ 2638 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2639 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2640 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2641 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2642 hdrlen = 30; 2643 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2644 wme_sta = sta->sta.wme; 2645 } 2646 if (!sdata->vif.valid_links) { 2647 struct ieee80211_sub_if_data *ap_sdata; 2648 2649 /* override chanctx_conf from AP (we don't have one) */ 2650 ap_sdata = container_of(sdata->bss, 2651 struct ieee80211_sub_if_data, 2652 u.ap); 2653 chanctx_conf = 2654 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2655 } 2656 if (sdata->wdev.use_4addr) 2657 break; 2658 fallthrough; 2659 case NL80211_IFTYPE_AP: 2660 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2661 /* DA BSSID SA */ 2662 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2663 2664 if (sdata->vif.valid_links && sta && !sta->sta.mlo) { 2665 struct ieee80211_link_data *link; 2666 2667 link_id = sta->deflink.link_id; 2668 link = rcu_dereference(sdata->link[link_id]); 2669 if (WARN_ON(!link)) { 2670 ret = -ENOLINK; 2671 goto free; 2672 } 2673 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2674 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2675 (sta && sta->sta.mlo)) { 2676 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2677 } else { 2678 struct ieee80211_bss_conf *conf; 2679 2680 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2681 if (unlikely(!conf)) { 2682 ret = -ENOLINK; 2683 goto free; 2684 } 2685 2686 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2687 } 2688 2689 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2690 hdrlen = 24; 2691 break; 2692 #ifdef CONFIG_MAC80211_MESH 2693 case NL80211_IFTYPE_MESH_POINT: 2694 if (!is_multicast_ether_addr(skb->data)) { 2695 struct sta_info *next_hop; 2696 bool mpp_lookup = true; 2697 2698 mpath = mesh_path_lookup(sdata, skb->data); 2699 if (mpath) { 2700 mpp_lookup = false; 2701 next_hop = rcu_dereference(mpath->next_hop); 2702 if (!next_hop || 2703 !(mpath->flags & (MESH_PATH_ACTIVE | 2704 MESH_PATH_RESOLVING))) 2705 mpp_lookup = true; 2706 } 2707 2708 if (mpp_lookup) { 2709 mppath = mpp_path_lookup(sdata, skb->data); 2710 if (mppath) 2711 mppath->exp_time = jiffies; 2712 } 2713 2714 if (mppath && mpath) 2715 mesh_path_del(sdata, mpath->dst); 2716 } 2717 2718 /* 2719 * Use address extension if it is a packet from 2720 * another interface or if we know the destination 2721 * is being proxied by a portal (i.e. portal address 2722 * differs from proxied address) 2723 */ 2724 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2725 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2726 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2727 skb->data, skb->data + ETH_ALEN); 2728 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2729 NULL, NULL); 2730 } else { 2731 /* DS -> MBSS (802.11-2012 13.11.3.3). 2732 * For unicast with unknown forwarding information, 2733 * destination might be in the MBSS or if that fails 2734 * forwarded to another mesh gate. In either case 2735 * resolution will be handled in ieee80211_xmit(), so 2736 * leave the original DA. This also works for mcast */ 2737 const u8 *mesh_da = skb->data; 2738 2739 if (mppath) 2740 mesh_da = mppath->mpp; 2741 else if (mpath) 2742 mesh_da = mpath->dst; 2743 2744 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2745 mesh_da, sdata->vif.addr); 2746 if (is_multicast_ether_addr(mesh_da)) 2747 /* DA TA mSA AE:SA */ 2748 meshhdrlen = ieee80211_new_mesh_header( 2749 sdata, &mesh_hdr, 2750 skb->data + ETH_ALEN, NULL); 2751 else 2752 /* RA TA mDA mSA AE:DA SA */ 2753 meshhdrlen = ieee80211_new_mesh_header( 2754 sdata, &mesh_hdr, skb->data, 2755 skb->data + ETH_ALEN); 2756 2757 } 2758 2759 /* For injected frames, fill RA right away as nexthop lookup 2760 * will be skipped. 2761 */ 2762 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2763 is_zero_ether_addr(hdr.addr1)) 2764 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2765 break; 2766 #endif 2767 case NL80211_IFTYPE_STATION: 2768 /* we already did checks when looking up the RA STA */ 2769 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2770 2771 if (tdls_peer) { 2772 /* DA SA BSSID */ 2773 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2774 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2775 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2776 hdrlen = 24; 2777 } else if (sdata->u.mgd.use_4addr && 2778 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2779 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2780 IEEE80211_FCTL_TODS); 2781 /* RA TA DA SA */ 2782 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2783 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2784 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2785 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2786 hdrlen = 30; 2787 } else { 2788 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2789 /* BSSID SA DA */ 2790 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2791 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2792 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2793 hdrlen = 24; 2794 } 2795 break; 2796 case NL80211_IFTYPE_OCB: 2797 /* DA SA BSSID */ 2798 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2799 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2800 eth_broadcast_addr(hdr.addr3); 2801 hdrlen = 24; 2802 break; 2803 case NL80211_IFTYPE_ADHOC: 2804 /* DA SA BSSID */ 2805 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2806 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2807 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2808 hdrlen = 24; 2809 break; 2810 default: 2811 ret = -EINVAL; 2812 goto free; 2813 } 2814 2815 if (!chanctx_conf) { 2816 if (!sdata->vif.valid_links) { 2817 ret = -ENOTCONN; 2818 goto free; 2819 } 2820 /* MLD transmissions must not rely on the band */ 2821 band = 0; 2822 } else { 2823 band = chanctx_conf->def.chan->band; 2824 } 2825 2826 multicast = is_multicast_ether_addr(hdr.addr1); 2827 2828 /* sta is always NULL for mesh */ 2829 if (sta) { 2830 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2831 wme_sta = sta->sta.wme; 2832 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2833 /* For mesh, the use of the QoS header is mandatory */ 2834 wme_sta = true; 2835 } 2836 2837 /* receiver does QoS (which also means we do) use it */ 2838 if (wme_sta) { 2839 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2840 hdrlen += 2; 2841 } 2842 2843 /* 2844 * Drop unicast frames to unauthorised stations unless they are 2845 * EAPOL frames from the local station. 2846 */ 2847 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2848 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2849 !multicast && !authorized && 2850 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2851 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2852 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2853 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2854 sdata->name, hdr.addr1); 2855 #endif 2856 2857 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2858 2859 ret = -EPERM; 2860 goto free; 2861 } 2862 2863 if (unlikely(!multicast && ((skb->sk && 2864 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2865 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2866 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2867 cookie); 2868 2869 /* 2870 * If the skb is shared we need to obtain our own copy. 2871 */ 2872 skb = skb_share_check(skb, GFP_ATOMIC); 2873 if (unlikely(!skb)) { 2874 ret = -ENOMEM; 2875 goto free; 2876 } 2877 2878 hdr.frame_control = fc; 2879 hdr.duration_id = 0; 2880 hdr.seq_ctrl = 0; 2881 2882 skip_header_bytes = ETH_HLEN; 2883 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2884 encaps_data = bridge_tunnel_header; 2885 encaps_len = sizeof(bridge_tunnel_header); 2886 skip_header_bytes -= 2; 2887 } else if (ethertype >= ETH_P_802_3_MIN) { 2888 encaps_data = rfc1042_header; 2889 encaps_len = sizeof(rfc1042_header); 2890 skip_header_bytes -= 2; 2891 } else { 2892 encaps_data = NULL; 2893 encaps_len = 0; 2894 } 2895 2896 skb_pull(skb, skip_header_bytes); 2897 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2898 2899 /* 2900 * So we need to modify the skb header and hence need a copy of 2901 * that. The head_need variable above doesn't, so far, include 2902 * the needed header space that we don't need right away. If we 2903 * can, then we don't reallocate right now but only after the 2904 * frame arrives at the master device (if it does...) 2905 * 2906 * If we cannot, however, then we will reallocate to include all 2907 * the ever needed space. Also, if we need to reallocate it anyway, 2908 * make it big enough for everything we may ever need. 2909 */ 2910 2911 if (head_need > 0 || skb_cloned(skb)) { 2912 head_need += IEEE80211_ENCRYPT_HEADROOM; 2913 head_need += local->tx_headroom; 2914 head_need = max_t(int, 0, head_need); 2915 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2916 ieee80211_free_txskb(&local->hw, skb); 2917 skb = NULL; 2918 return ERR_PTR(-ENOMEM); 2919 } 2920 } 2921 2922 if (encaps_data) 2923 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2924 2925 #ifdef CONFIG_MAC80211_MESH 2926 if (meshhdrlen > 0) 2927 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2928 #endif 2929 2930 if (ieee80211_is_data_qos(fc)) { 2931 __le16 *qos_control; 2932 2933 qos_control = skb_push(skb, 2); 2934 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2935 /* 2936 * Maybe we could actually set some fields here, for now just 2937 * initialise to zero to indicate no special operation. 2938 */ 2939 *qos_control = 0; 2940 } else 2941 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2942 2943 skb_reset_mac_header(skb); 2944 2945 info = IEEE80211_SKB_CB(skb); 2946 memset(info, 0, sizeof(*info)); 2947 2948 info->flags = info_flags; 2949 info->ack_frame_id = info_id; 2950 info->band = band; 2951 2952 if (likely(!cookie)) { 2953 ctrl_flags |= u32_encode_bits(link_id, 2954 IEEE80211_TX_CTRL_MLO_LINK); 2955 } else { 2956 unsigned int pre_conf_link_id; 2957 2958 /* 2959 * ctrl_flags already have been set by 2960 * ieee80211_tx_control_port(), here 2961 * we just sanity check that 2962 */ 2963 2964 pre_conf_link_id = u32_get_bits(ctrl_flags, 2965 IEEE80211_TX_CTRL_MLO_LINK); 2966 2967 if (pre_conf_link_id != link_id && 2968 link_id != IEEE80211_LINK_UNSPECIFIED) { 2969 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2970 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2971 sdata->name, hdr.addr1, 2972 pre_conf_link_id, link_id); 2973 #endif 2974 ret = -EINVAL; 2975 goto free; 2976 } 2977 } 2978 2979 info->control.flags = ctrl_flags; 2980 2981 return skb; 2982 free: 2983 kfree_skb(skb); 2984 return ERR_PTR(ret); 2985 } 2986 2987 /* 2988 * fast-xmit overview 2989 * 2990 * The core idea of this fast-xmit is to remove per-packet checks by checking 2991 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2992 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2993 * much less work can be done per packet. For example, fragmentation must be 2994 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2995 * in the code here. 2996 * 2997 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2998 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2999 * 3000 * The most difficult part of this is that when any of these assumptions 3001 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3002 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3003 * since the per-packet code no longer checks the conditions. This is reflected 3004 * by the calls to these functions throughout the rest of the code, and must be 3005 * maintained if any of the TX path checks change. 3006 */ 3007 3008 void ieee80211_check_fast_xmit(struct sta_info *sta) 3009 { 3010 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3011 struct ieee80211_local *local = sta->local; 3012 struct ieee80211_sub_if_data *sdata = sta->sdata; 3013 struct ieee80211_hdr *hdr = (void *)build.hdr; 3014 struct ieee80211_chanctx_conf *chanctx_conf; 3015 __le16 fc; 3016 3017 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3018 return; 3019 3020 if (ieee80211_vif_is_mesh(&sdata->vif)) 3021 mesh_fast_tx_flush_sta(sdata, sta); 3022 3023 /* Locking here protects both the pointer itself, and against concurrent 3024 * invocations winning data access races to, e.g., the key pointer that 3025 * is used. 3026 * Without it, the invocation of this function right after the key 3027 * pointer changes wouldn't be sufficient, as another CPU could access 3028 * the pointer, then stall, and then do the cache update after the CPU 3029 * that invalidated the key. 3030 * With the locking, such scenarios cannot happen as the check for the 3031 * key and the fast-tx assignment are done atomically, so the CPU that 3032 * modifies the key will either wait or other one will see the key 3033 * cleared/changed already. 3034 */ 3035 spin_lock_bh(&sta->lock); 3036 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3037 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3038 sdata->vif.type == NL80211_IFTYPE_STATION) 3039 goto out; 3040 3041 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3042 goto out; 3043 3044 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3045 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3046 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3047 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3048 goto out; 3049 3050 if (sdata->noack_map) 3051 goto out; 3052 3053 /* fast-xmit doesn't handle fragmentation at all */ 3054 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3055 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3056 goto out; 3057 3058 if (!sdata->vif.valid_links) { 3059 rcu_read_lock(); 3060 chanctx_conf = 3061 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3062 if (!chanctx_conf) { 3063 rcu_read_unlock(); 3064 goto out; 3065 } 3066 build.band = chanctx_conf->def.chan->band; 3067 rcu_read_unlock(); 3068 } else { 3069 /* MLD transmissions must not rely on the band */ 3070 build.band = 0; 3071 } 3072 3073 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3074 3075 switch (sdata->vif.type) { 3076 case NL80211_IFTYPE_ADHOC: 3077 /* DA SA BSSID */ 3078 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3079 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3080 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3081 build.hdr_len = 24; 3082 break; 3083 case NL80211_IFTYPE_STATION: 3084 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3085 /* DA SA BSSID */ 3086 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3087 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3088 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3089 build.hdr_len = 24; 3090 break; 3091 } 3092 3093 if (sdata->u.mgd.use_4addr) { 3094 /* non-regular ethertype cannot use the fastpath */ 3095 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3096 IEEE80211_FCTL_TODS); 3097 /* RA TA DA SA */ 3098 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3099 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3100 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3101 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3102 build.hdr_len = 30; 3103 break; 3104 } 3105 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3106 /* BSSID SA DA */ 3107 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3108 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3109 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3110 build.hdr_len = 24; 3111 break; 3112 case NL80211_IFTYPE_AP_VLAN: 3113 if (sdata->wdev.use_4addr) { 3114 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3115 IEEE80211_FCTL_TODS); 3116 /* RA TA DA SA */ 3117 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3118 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3119 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3120 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3121 build.hdr_len = 30; 3122 break; 3123 } 3124 fallthrough; 3125 case NL80211_IFTYPE_AP: 3126 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3127 /* DA BSSID SA */ 3128 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3129 if (sta->sta.mlo || !sdata->vif.valid_links) { 3130 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3131 } else { 3132 unsigned int link_id = sta->deflink.link_id; 3133 struct ieee80211_link_data *link; 3134 3135 rcu_read_lock(); 3136 link = rcu_dereference(sdata->link[link_id]); 3137 if (WARN_ON(!link)) { 3138 rcu_read_unlock(); 3139 goto out; 3140 } 3141 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3142 rcu_read_unlock(); 3143 } 3144 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3145 build.hdr_len = 24; 3146 break; 3147 default: 3148 /* not handled on fast-xmit */ 3149 goto out; 3150 } 3151 3152 if (sta->sta.wme) { 3153 build.hdr_len += 2; 3154 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3155 } 3156 3157 /* We store the key here so there's no point in using rcu_dereference() 3158 * but that's fine because the code that changes the pointers will call 3159 * this function after doing so. For a single CPU that would be enough, 3160 * for multiple see the comment above. 3161 */ 3162 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3163 if (!build.key) 3164 build.key = rcu_access_pointer(sdata->default_unicast_key); 3165 if (build.key) { 3166 bool gen_iv, iv_spc, mmic; 3167 3168 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3169 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3170 mmic = build.key->conf.flags & 3171 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3172 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3173 3174 /* don't handle software crypto */ 3175 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3176 goto out; 3177 3178 /* Key is being removed */ 3179 if (build.key->flags & KEY_FLAG_TAINTED) 3180 goto out; 3181 3182 switch (build.key->conf.cipher) { 3183 case WLAN_CIPHER_SUITE_CCMP: 3184 case WLAN_CIPHER_SUITE_CCMP_256: 3185 if (gen_iv) 3186 build.pn_offs = build.hdr_len; 3187 if (gen_iv || iv_spc) 3188 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3189 break; 3190 case WLAN_CIPHER_SUITE_GCMP: 3191 case WLAN_CIPHER_SUITE_GCMP_256: 3192 if (gen_iv) 3193 build.pn_offs = build.hdr_len; 3194 if (gen_iv || iv_spc) 3195 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3196 break; 3197 case WLAN_CIPHER_SUITE_TKIP: 3198 /* cannot handle MMIC or IV generation in xmit-fast */ 3199 if (mmic || gen_iv) 3200 goto out; 3201 if (iv_spc) 3202 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3203 break; 3204 case WLAN_CIPHER_SUITE_WEP40: 3205 case WLAN_CIPHER_SUITE_WEP104: 3206 /* cannot handle IV generation in fast-xmit */ 3207 if (gen_iv) 3208 goto out; 3209 if (iv_spc) 3210 build.hdr_len += IEEE80211_WEP_IV_LEN; 3211 break; 3212 case WLAN_CIPHER_SUITE_AES_CMAC: 3213 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3214 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3215 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3216 WARN(1, 3217 "management cipher suite 0x%x enabled for data\n", 3218 build.key->conf.cipher); 3219 goto out; 3220 default: 3221 /* we don't know how to generate IVs for this at all */ 3222 if (WARN_ON(gen_iv)) 3223 goto out; 3224 } 3225 3226 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3227 } 3228 3229 hdr->frame_control = fc; 3230 3231 memcpy(build.hdr + build.hdr_len, 3232 rfc1042_header, sizeof(rfc1042_header)); 3233 build.hdr_len += sizeof(rfc1042_header); 3234 3235 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3236 /* if the kmemdup fails, continue w/o fast_tx */ 3237 3238 out: 3239 /* we might have raced against another call to this function */ 3240 old = rcu_dereference_protected(sta->fast_tx, 3241 lockdep_is_held(&sta->lock)); 3242 rcu_assign_pointer(sta->fast_tx, fast_tx); 3243 if (old) 3244 kfree_rcu(old, rcu_head); 3245 spin_unlock_bh(&sta->lock); 3246 } 3247 3248 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3249 { 3250 struct sta_info *sta; 3251 3252 rcu_read_lock(); 3253 list_for_each_entry_rcu(sta, &local->sta_list, list) 3254 ieee80211_check_fast_xmit(sta); 3255 rcu_read_unlock(); 3256 } 3257 3258 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3259 { 3260 struct ieee80211_local *local = sdata->local; 3261 struct sta_info *sta; 3262 3263 rcu_read_lock(); 3264 3265 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3266 if (sdata != sta->sdata && 3267 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3268 continue; 3269 ieee80211_check_fast_xmit(sta); 3270 } 3271 3272 rcu_read_unlock(); 3273 } 3274 3275 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3276 { 3277 struct ieee80211_fast_tx *fast_tx; 3278 3279 spin_lock_bh(&sta->lock); 3280 fast_tx = rcu_dereference_protected(sta->fast_tx, 3281 lockdep_is_held(&sta->lock)); 3282 RCU_INIT_POINTER(sta->fast_tx, NULL); 3283 spin_unlock_bh(&sta->lock); 3284 3285 if (fast_tx) 3286 kfree_rcu(fast_tx, rcu_head); 3287 } 3288 3289 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3290 struct sk_buff *skb, int headroom) 3291 { 3292 if (skb_headroom(skb) < headroom) { 3293 I802_DEBUG_INC(local->tx_expand_skb_head); 3294 3295 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3296 wiphy_debug(local->hw.wiphy, 3297 "failed to reallocate TX buffer\n"); 3298 return false; 3299 } 3300 } 3301 3302 return true; 3303 } 3304 3305 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3306 struct ieee80211_fast_tx *fast_tx, 3307 struct sk_buff *skb) 3308 { 3309 struct ieee80211_local *local = sdata->local; 3310 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3311 struct ieee80211_hdr *hdr; 3312 struct ethhdr *amsdu_hdr; 3313 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3314 int subframe_len = skb->len - hdr_len; 3315 void *data; 3316 u8 *qc, *h_80211_src, *h_80211_dst; 3317 const u8 *bssid; 3318 3319 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3320 return false; 3321 3322 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3323 return true; 3324 3325 if (!ieee80211_amsdu_realloc_pad(local, skb, 3326 sizeof(*amsdu_hdr) + 3327 local->hw.extra_tx_headroom)) 3328 return false; 3329 3330 data = skb_push(skb, sizeof(*amsdu_hdr)); 3331 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3332 hdr = data; 3333 amsdu_hdr = data + hdr_len; 3334 /* h_80211_src/dst is addr* field within hdr */ 3335 h_80211_src = data + fast_tx->sa_offs; 3336 h_80211_dst = data + fast_tx->da_offs; 3337 3338 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3339 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3340 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3341 3342 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3343 * fields needs to be changed to BSSID for A-MSDU frames depending 3344 * on FromDS/ToDS values. 3345 */ 3346 switch (sdata->vif.type) { 3347 case NL80211_IFTYPE_STATION: 3348 bssid = sdata->vif.cfg.ap_addr; 3349 break; 3350 case NL80211_IFTYPE_AP: 3351 case NL80211_IFTYPE_AP_VLAN: 3352 bssid = sdata->vif.addr; 3353 break; 3354 default: 3355 bssid = NULL; 3356 } 3357 3358 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3359 ether_addr_copy(h_80211_src, bssid); 3360 3361 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3362 ether_addr_copy(h_80211_dst, bssid); 3363 3364 qc = ieee80211_get_qos_ctl(hdr); 3365 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3366 3367 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3368 3369 return true; 3370 } 3371 3372 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3373 struct sta_info *sta, 3374 struct ieee80211_fast_tx *fast_tx, 3375 struct sk_buff *skb, 3376 const u8 *da, const u8 *sa) 3377 { 3378 struct ieee80211_local *local = sdata->local; 3379 struct fq *fq = &local->fq; 3380 struct fq_tin *tin; 3381 struct fq_flow *flow; 3382 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3383 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3384 struct txq_info *txqi; 3385 struct sk_buff **frag_tail, *head; 3386 int subframe_len = skb->len - ETH_ALEN; 3387 u8 max_subframes = sta->sta.max_amsdu_subframes; 3388 int max_frags = local->hw.max_tx_fragments; 3389 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3390 int orig_truesize; 3391 u32 flow_idx; 3392 __be16 len; 3393 void *data; 3394 bool ret = false; 3395 unsigned int orig_len; 3396 int n = 2, nfrags, pad = 0; 3397 u16 hdrlen; 3398 3399 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3400 return false; 3401 3402 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3403 return false; 3404 3405 if (ieee80211_vif_is_mesh(&sdata->vif)) 3406 return false; 3407 3408 if (skb_is_gso(skb)) 3409 return false; 3410 3411 if (!txq) 3412 return false; 3413 3414 txqi = to_txq_info(txq); 3415 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3416 return false; 3417 3418 if (sta->sta.cur->max_rc_amsdu_len) 3419 max_amsdu_len = min_t(int, max_amsdu_len, 3420 sta->sta.cur->max_rc_amsdu_len); 3421 3422 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3423 max_amsdu_len = min_t(int, max_amsdu_len, 3424 sta->sta.cur->max_tid_amsdu_len[tid]); 3425 3426 flow_idx = fq_flow_idx(fq, skb); 3427 3428 spin_lock_bh(&fq->lock); 3429 3430 /* TODO: Ideally aggregation should be done on dequeue to remain 3431 * responsive to environment changes. 3432 */ 3433 3434 tin = &txqi->tin; 3435 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3436 head = skb_peek_tail(&flow->queue); 3437 if (!head || skb_is_gso(head)) 3438 goto out; 3439 3440 orig_truesize = head->truesize; 3441 orig_len = head->len; 3442 3443 if (skb->len + head->len > max_amsdu_len) 3444 goto out; 3445 3446 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3447 nfrags += 1 + skb_shinfo(head)->nr_frags; 3448 frag_tail = &skb_shinfo(head)->frag_list; 3449 while (*frag_tail) { 3450 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3451 frag_tail = &(*frag_tail)->next; 3452 n++; 3453 } 3454 3455 if (max_subframes && n > max_subframes) 3456 goto out; 3457 3458 if (max_frags && nfrags > max_frags) 3459 goto out; 3460 3461 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3462 goto out; 3463 3464 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3465 goto out; 3466 3467 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3468 * and frag_tail should be &skb_shinfo(head)->frag_list. 3469 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3470 * Reload frag_tail to have it pointing to the correct place. 3471 */ 3472 if (n == 2) 3473 frag_tail = &skb_shinfo(head)->frag_list; 3474 3475 /* 3476 * Pad out the previous subframe to a multiple of 4 by adding the 3477 * padding to the next one, that's being added. Note that head->len 3478 * is the length of the full A-MSDU, but that works since each time 3479 * we add a new subframe we pad out the previous one to a multiple 3480 * of 4 and thus it no longer matters in the next round. 3481 */ 3482 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3483 if ((head->len - hdrlen) & 3) 3484 pad = 4 - ((head->len - hdrlen) & 3); 3485 3486 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3487 2 + pad)) 3488 goto out_recalc; 3489 3490 ret = true; 3491 data = skb_push(skb, ETH_ALEN + 2); 3492 ether_addr_copy(data, da); 3493 ether_addr_copy(data + ETH_ALEN, sa); 3494 3495 data += 2 * ETH_ALEN; 3496 len = cpu_to_be16(subframe_len); 3497 memcpy(data, &len, 2); 3498 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3499 3500 memset(skb_push(skb, pad), 0, pad); 3501 3502 head->len += skb->len; 3503 head->data_len += skb->len; 3504 *frag_tail = skb; 3505 3506 out_recalc: 3507 fq->memory_usage += head->truesize - orig_truesize; 3508 if (head->len != orig_len) { 3509 flow->backlog += head->len - orig_len; 3510 tin->backlog_bytes += head->len - orig_len; 3511 } 3512 out: 3513 spin_unlock_bh(&fq->lock); 3514 3515 return ret; 3516 } 3517 3518 /* 3519 * Can be called while the sta lock is held. Anything that can cause packets to 3520 * be generated will cause deadlock! 3521 */ 3522 static ieee80211_tx_result 3523 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3524 struct sta_info *sta, u8 pn_offs, 3525 struct ieee80211_key *key, 3526 struct ieee80211_tx_data *tx) 3527 { 3528 struct sk_buff *skb = tx->skb; 3529 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3530 struct ieee80211_hdr *hdr = (void *)skb->data; 3531 u8 tid = IEEE80211_NUM_TIDS; 3532 3533 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3534 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3535 return TX_DROP; 3536 3537 if (key) 3538 info->control.hw_key = &key->conf; 3539 3540 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3541 3542 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3543 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3544 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3545 } else { 3546 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3547 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3548 sdata->sequence_number += 0x10; 3549 } 3550 3551 if (skb_shinfo(skb)->gso_size) 3552 sta->deflink.tx_stats.msdu[tid] += 3553 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3554 else 3555 sta->deflink.tx_stats.msdu[tid]++; 3556 3557 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3558 3559 /* statistics normally done by ieee80211_tx_h_stats (but that 3560 * has to consider fragmentation, so is more complex) 3561 */ 3562 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3563 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3564 3565 if (pn_offs) { 3566 u64 pn; 3567 u8 *crypto_hdr = skb->data + pn_offs; 3568 3569 switch (key->conf.cipher) { 3570 case WLAN_CIPHER_SUITE_CCMP: 3571 case WLAN_CIPHER_SUITE_CCMP_256: 3572 case WLAN_CIPHER_SUITE_GCMP: 3573 case WLAN_CIPHER_SUITE_GCMP_256: 3574 pn = atomic64_inc_return(&key->conf.tx_pn); 3575 crypto_hdr[0] = pn; 3576 crypto_hdr[1] = pn >> 8; 3577 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3578 crypto_hdr[4] = pn >> 16; 3579 crypto_hdr[5] = pn >> 24; 3580 crypto_hdr[6] = pn >> 32; 3581 crypto_hdr[7] = pn >> 40; 3582 break; 3583 } 3584 } 3585 3586 return TX_CONTINUE; 3587 } 3588 3589 static netdev_features_t 3590 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3591 { 3592 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3593 return sdata->vif.netdev_features; 3594 3595 if (!sdata->bss) 3596 return 0; 3597 3598 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3599 return sdata->vif.netdev_features; 3600 } 3601 3602 static struct sk_buff * 3603 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3604 { 3605 if (skb_is_gso(skb)) { 3606 struct sk_buff *segs; 3607 3608 segs = skb_gso_segment(skb, features); 3609 if (!segs) 3610 return skb; 3611 if (IS_ERR(segs)) 3612 goto free; 3613 3614 consume_skb(skb); 3615 return segs; 3616 } 3617 3618 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3619 goto free; 3620 3621 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3622 int ofs = skb_checksum_start_offset(skb); 3623 3624 if (skb->encapsulation) 3625 skb_set_inner_transport_header(skb, ofs); 3626 else 3627 skb_set_transport_header(skb, ofs); 3628 3629 if (skb_csum_hwoffload_help(skb, features)) 3630 goto free; 3631 } 3632 3633 skb_mark_not_on_list(skb); 3634 return skb; 3635 3636 free: 3637 kfree_skb(skb); 3638 return NULL; 3639 } 3640 3641 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3642 struct sta_info *sta, 3643 struct ieee80211_fast_tx *fast_tx, 3644 struct sk_buff *skb, bool ampdu, 3645 const u8 *da, const u8 *sa) 3646 { 3647 struct ieee80211_local *local = sdata->local; 3648 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3649 struct ieee80211_tx_info *info; 3650 struct ieee80211_tx_data tx; 3651 ieee80211_tx_result r; 3652 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3653 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3654 3655 skb = skb_share_check(skb, GFP_ATOMIC); 3656 if (unlikely(!skb)) 3657 return; 3658 3659 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3660 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3661 return; 3662 3663 /* will not be crypto-handled beyond what we do here, so use false 3664 * as the may-encrypt argument for the resize to not account for 3665 * more room than we already have in 'extra_head' 3666 */ 3667 if (unlikely(ieee80211_skb_resize(sdata, skb, 3668 max_t(int, extra_head + hw_headroom - 3669 skb_headroom(skb), 0), 3670 ENCRYPT_NO))) 3671 goto free; 3672 3673 hdr = skb_push(skb, extra_head); 3674 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3675 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3676 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3677 3678 info = IEEE80211_SKB_CB(skb); 3679 memset(info, 0, sizeof(*info)); 3680 info->band = fast_tx->band; 3681 info->control.vif = &sdata->vif; 3682 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3683 IEEE80211_TX_CTL_DONTFRAG; 3684 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3685 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3686 IEEE80211_TX_CTRL_MLO_LINK); 3687 3688 #ifdef CONFIG_MAC80211_DEBUGFS 3689 if (local->force_tx_status) 3690 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3691 #endif 3692 3693 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3694 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3695 3696 *ieee80211_get_qos_ctl(hdr) = tid; 3697 } 3698 3699 __skb_queue_head_init(&tx.skbs); 3700 3701 tx.flags = IEEE80211_TX_UNICAST; 3702 tx.local = local; 3703 tx.sdata = sdata; 3704 tx.sta = sta; 3705 tx.key = fast_tx->key; 3706 3707 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3708 return; 3709 3710 tx.skb = skb; 3711 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3712 fast_tx->key, &tx); 3713 tx.skb = NULL; 3714 if (r == TX_DROP) 3715 goto free; 3716 3717 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3718 sdata = container_of(sdata->bss, 3719 struct ieee80211_sub_if_data, u.ap); 3720 3721 __skb_queue_tail(&tx.skbs, skb); 3722 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3723 return; 3724 3725 free: 3726 kfree_skb(skb); 3727 } 3728 3729 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3730 struct sta_info *sta, 3731 struct ieee80211_fast_tx *fast_tx, 3732 struct sk_buff *skb) 3733 { 3734 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3735 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3736 struct tid_ampdu_tx *tid_tx = NULL; 3737 struct sk_buff *next; 3738 struct ethhdr eth; 3739 u8 tid = IEEE80211_NUM_TIDS; 3740 3741 /* control port protocol needs a lot of special handling */ 3742 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3743 return false; 3744 3745 /* only RFC 1042 SNAP */ 3746 if (ethertype < ETH_P_802_3_MIN) 3747 return false; 3748 3749 /* don't handle TX status request here either */ 3750 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3751 return false; 3752 3753 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3754 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3755 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3756 if (tid_tx) { 3757 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3758 return false; 3759 if (tid_tx->timeout) 3760 tid_tx->last_tx = jiffies; 3761 } 3762 } 3763 3764 memcpy(ð, skb->data, ETH_HLEN - 2); 3765 3766 /* after this point (skb is modified) we cannot return false */ 3767 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3768 if (!skb) 3769 return true; 3770 3771 skb_list_walk_safe(skb, skb, next) { 3772 skb_mark_not_on_list(skb); 3773 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3774 eth.h_dest, eth.h_source); 3775 } 3776 3777 return true; 3778 } 3779 3780 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3781 struct ieee80211_txq *txq) 3782 { 3783 struct ieee80211_local *local = hw_to_local(hw); 3784 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3785 struct ieee80211_hdr *hdr; 3786 struct sk_buff *skb = NULL; 3787 struct fq *fq = &local->fq; 3788 struct fq_tin *tin = &txqi->tin; 3789 struct ieee80211_tx_info *info; 3790 struct ieee80211_tx_data tx; 3791 ieee80211_tx_result r; 3792 struct ieee80211_vif *vif = txq->vif; 3793 int q = vif->hw_queue[txq->ac]; 3794 unsigned long flags; 3795 bool q_stopped; 3796 3797 WARN_ON_ONCE(softirq_count() == 0); 3798 3799 if (!ieee80211_txq_airtime_check(hw, txq)) 3800 return NULL; 3801 3802 begin: 3803 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3804 q_stopped = local->queue_stop_reasons[q]; 3805 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3806 3807 if (unlikely(q_stopped)) { 3808 /* mark for waking later */ 3809 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3810 return NULL; 3811 } 3812 3813 spin_lock_bh(&fq->lock); 3814 3815 /* Make sure fragments stay together. */ 3816 skb = __skb_dequeue(&txqi->frags); 3817 if (unlikely(skb)) { 3818 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3819 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3820 goto out; 3821 IEEE80211_SKB_CB(skb)->control.flags &= 3822 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3823 } else { 3824 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3825 goto out; 3826 3827 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3828 } 3829 3830 if (!skb) 3831 goto out; 3832 3833 spin_unlock_bh(&fq->lock); 3834 3835 hdr = (struct ieee80211_hdr *)skb->data; 3836 info = IEEE80211_SKB_CB(skb); 3837 3838 memset(&tx, 0, sizeof(tx)); 3839 __skb_queue_head_init(&tx.skbs); 3840 tx.local = local; 3841 tx.skb = skb; 3842 tx.sdata = vif_to_sdata(info->control.vif); 3843 3844 if (txq->sta) { 3845 tx.sta = container_of(txq->sta, struct sta_info, sta); 3846 /* 3847 * Drop unicast frames to unauthorised stations unless they are 3848 * injected frames or EAPOL frames from the local station. 3849 */ 3850 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3851 ieee80211_is_data(hdr->frame_control) && 3852 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3853 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3854 !is_multicast_ether_addr(hdr->addr1) && 3855 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3856 (!(info->control.flags & 3857 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3858 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3859 NULL)))) { 3860 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3861 ieee80211_free_txskb(&local->hw, skb); 3862 goto begin; 3863 } 3864 } 3865 3866 /* 3867 * The key can be removed while the packet was queued, so need to call 3868 * this here to get the current key. 3869 */ 3870 r = ieee80211_tx_h_select_key(&tx); 3871 if (r != TX_CONTINUE) { 3872 ieee80211_free_txskb(&local->hw, skb); 3873 goto begin; 3874 } 3875 3876 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3877 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3878 IEEE80211_TX_CTL_DONTFRAG); 3879 3880 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3881 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3882 r = ieee80211_tx_h_rate_ctrl(&tx); 3883 if (r != TX_CONTINUE) { 3884 ieee80211_free_txskb(&local->hw, skb); 3885 goto begin; 3886 } 3887 } 3888 goto encap_out; 3889 } 3890 3891 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3892 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3893 sta); 3894 u8 pn_offs = 0; 3895 3896 if (tx.key && 3897 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3898 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3899 3900 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3901 tx.key, &tx); 3902 if (r != TX_CONTINUE) { 3903 ieee80211_free_txskb(&local->hw, skb); 3904 goto begin; 3905 } 3906 } else { 3907 if (invoke_tx_handlers_late(&tx)) 3908 goto begin; 3909 3910 skb = __skb_dequeue(&tx.skbs); 3911 3912 if (!skb_queue_empty(&tx.skbs)) { 3913 spin_lock_bh(&fq->lock); 3914 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3915 spin_unlock_bh(&fq->lock); 3916 } 3917 } 3918 3919 if (skb_has_frag_list(skb) && 3920 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3921 if (skb_linearize(skb)) { 3922 ieee80211_free_txskb(&local->hw, skb); 3923 goto begin; 3924 } 3925 } 3926 3927 switch (tx.sdata->vif.type) { 3928 case NL80211_IFTYPE_MONITOR: 3929 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3930 vif = &tx.sdata->vif; 3931 break; 3932 } 3933 tx.sdata = rcu_dereference(local->monitor_sdata); 3934 if (tx.sdata) { 3935 vif = &tx.sdata->vif; 3936 info->hw_queue = 3937 vif->hw_queue[skb_get_queue_mapping(skb)]; 3938 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3939 ieee80211_free_txskb(&local->hw, skb); 3940 goto begin; 3941 } else { 3942 vif = NULL; 3943 } 3944 break; 3945 case NL80211_IFTYPE_AP_VLAN: 3946 tx.sdata = container_of(tx.sdata->bss, 3947 struct ieee80211_sub_if_data, u.ap); 3948 fallthrough; 3949 default: 3950 vif = &tx.sdata->vif; 3951 break; 3952 } 3953 3954 encap_out: 3955 IEEE80211_SKB_CB(skb)->control.vif = vif; 3956 3957 if (tx.sta && 3958 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3959 bool ampdu = txq->ac != IEEE80211_AC_VO; 3960 u32 airtime; 3961 3962 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3963 skb->len, ampdu); 3964 if (airtime) { 3965 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3966 ieee80211_sta_update_pending_airtime(local, tx.sta, 3967 txq->ac, 3968 airtime, 3969 false); 3970 } 3971 } 3972 3973 return skb; 3974 3975 out: 3976 spin_unlock_bh(&fq->lock); 3977 3978 return skb; 3979 } 3980 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3981 3982 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3983 { 3984 struct airtime_info *air_info = &sta->airtime[ac]; 3985 3986 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3987 } 3988 3989 static void 3990 ieee80211_txq_set_active(struct txq_info *txqi) 3991 { 3992 struct sta_info *sta; 3993 3994 if (!txqi->txq.sta) 3995 return; 3996 3997 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3998 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 3999 } 4000 4001 static bool 4002 ieee80211_txq_keep_active(struct txq_info *txqi) 4003 { 4004 struct sta_info *sta; 4005 u32 diff; 4006 4007 if (!txqi->txq.sta) 4008 return false; 4009 4010 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4011 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4012 return false; 4013 4014 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 4015 4016 return diff <= AIRTIME_ACTIVE_DURATION; 4017 } 4018 4019 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4020 { 4021 struct ieee80211_local *local = hw_to_local(hw); 4022 struct ieee80211_txq *ret = NULL; 4023 struct txq_info *txqi = NULL, *head = NULL; 4024 bool found_eligible_txq = false; 4025 4026 spin_lock_bh(&local->active_txq_lock[ac]); 4027 4028 if (!local->schedule_round[ac]) 4029 goto out; 4030 4031 begin: 4032 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4033 struct txq_info, 4034 schedule_order); 4035 if (!txqi) 4036 goto out; 4037 4038 if (txqi == head) { 4039 if (!found_eligible_txq) 4040 goto out; 4041 else 4042 found_eligible_txq = false; 4043 } 4044 4045 if (!head) 4046 head = txqi; 4047 4048 if (txqi->txq.sta) { 4049 struct sta_info *sta = container_of(txqi->txq.sta, 4050 struct sta_info, sta); 4051 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4052 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4053 4054 if (aql_check) 4055 found_eligible_txq = true; 4056 4057 if (deficit < 0) 4058 sta->airtime[txqi->txq.ac].deficit += 4059 sta->airtime_weight; 4060 4061 if (deficit < 0 || !aql_check) { 4062 list_move_tail(&txqi->schedule_order, 4063 &local->active_txqs[txqi->txq.ac]); 4064 goto begin; 4065 } 4066 } 4067 4068 if (txqi->schedule_round == local->schedule_round[ac]) 4069 goto out; 4070 4071 list_del_init(&txqi->schedule_order); 4072 txqi->schedule_round = local->schedule_round[ac]; 4073 ret = &txqi->txq; 4074 4075 out: 4076 spin_unlock_bh(&local->active_txq_lock[ac]); 4077 return ret; 4078 } 4079 EXPORT_SYMBOL(ieee80211_next_txq); 4080 4081 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4082 struct ieee80211_txq *txq, 4083 bool force) 4084 { 4085 struct ieee80211_local *local = hw_to_local(hw); 4086 struct txq_info *txqi = to_txq_info(txq); 4087 bool has_queue; 4088 4089 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4090 4091 has_queue = force || txq_has_queue(txq); 4092 if (list_empty(&txqi->schedule_order) && 4093 (has_queue || ieee80211_txq_keep_active(txqi))) { 4094 /* If airtime accounting is active, always enqueue STAs at the 4095 * head of the list to ensure that they only get moved to the 4096 * back by the airtime DRR scheduler once they have a negative 4097 * deficit. A station that already has a negative deficit will 4098 * get immediately moved to the back of the list on the next 4099 * call to ieee80211_next_txq(). 4100 */ 4101 if (txqi->txq.sta && local->airtime_flags && has_queue && 4102 wiphy_ext_feature_isset(local->hw.wiphy, 4103 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4104 list_add(&txqi->schedule_order, 4105 &local->active_txqs[txq->ac]); 4106 else 4107 list_add_tail(&txqi->schedule_order, 4108 &local->active_txqs[txq->ac]); 4109 if (has_queue) 4110 ieee80211_txq_set_active(txqi); 4111 } 4112 4113 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4114 } 4115 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4116 4117 DEFINE_STATIC_KEY_FALSE(aql_disable); 4118 4119 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4120 struct ieee80211_txq *txq) 4121 { 4122 struct sta_info *sta; 4123 struct ieee80211_local *local = hw_to_local(hw); 4124 4125 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4126 return true; 4127 4128 if (static_branch_unlikely(&aql_disable)) 4129 return true; 4130 4131 if (!txq->sta) 4132 return true; 4133 4134 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4135 return true; 4136 4137 sta = container_of(txq->sta, struct sta_info, sta); 4138 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4139 sta->airtime[txq->ac].aql_limit_low) 4140 return true; 4141 4142 if (atomic_read(&local->aql_total_pending_airtime) < 4143 local->aql_threshold && 4144 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4145 sta->airtime[txq->ac].aql_limit_high) 4146 return true; 4147 4148 return false; 4149 } 4150 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4151 4152 static bool 4153 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4154 { 4155 unsigned int num_txq = 0; 4156 struct txq_info *txq; 4157 u32 aql_limit; 4158 4159 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4160 return true; 4161 4162 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4163 num_txq++; 4164 4165 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4166 local->aql_txq_limit_high[ac]; 4167 4168 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4169 } 4170 4171 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4172 struct ieee80211_txq *txq) 4173 { 4174 struct ieee80211_local *local = hw_to_local(hw); 4175 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4176 struct sta_info *sta; 4177 u8 ac = txq->ac; 4178 4179 spin_lock_bh(&local->active_txq_lock[ac]); 4180 4181 if (!txqi->txq.sta) 4182 goto out; 4183 4184 if (list_empty(&txqi->schedule_order)) 4185 goto out; 4186 4187 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4188 goto out; 4189 4190 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4191 schedule_order) { 4192 if (iter == txqi) 4193 break; 4194 4195 if (!iter->txq.sta) { 4196 list_move_tail(&iter->schedule_order, 4197 &local->active_txqs[ac]); 4198 continue; 4199 } 4200 sta = container_of(iter->txq.sta, struct sta_info, sta); 4201 if (ieee80211_sta_deficit(sta, ac) < 0) 4202 sta->airtime[ac].deficit += sta->airtime_weight; 4203 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4204 } 4205 4206 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4207 if (sta->airtime[ac].deficit >= 0) 4208 goto out; 4209 4210 sta->airtime[ac].deficit += sta->airtime_weight; 4211 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4212 spin_unlock_bh(&local->active_txq_lock[ac]); 4213 4214 return false; 4215 out: 4216 if (!list_empty(&txqi->schedule_order)) 4217 list_del_init(&txqi->schedule_order); 4218 spin_unlock_bh(&local->active_txq_lock[ac]); 4219 4220 return true; 4221 } 4222 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4223 4224 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4225 { 4226 struct ieee80211_local *local = hw_to_local(hw); 4227 4228 spin_lock_bh(&local->active_txq_lock[ac]); 4229 4230 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4231 local->schedule_round[ac]++; 4232 if (!local->schedule_round[ac]) 4233 local->schedule_round[ac]++; 4234 } else { 4235 local->schedule_round[ac] = 0; 4236 } 4237 4238 spin_unlock_bh(&local->active_txq_lock[ac]); 4239 } 4240 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4241 4242 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4243 struct net_device *dev, 4244 u32 info_flags, 4245 u32 ctrl_flags, 4246 u64 *cookie) 4247 { 4248 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4249 struct ieee80211_local *local = sdata->local; 4250 struct sta_info *sta; 4251 struct sk_buff *next; 4252 int len = skb->len; 4253 4254 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4255 kfree_skb(skb); 4256 return; 4257 } 4258 4259 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4260 4261 rcu_read_lock(); 4262 4263 if (ieee80211_vif_is_mesh(&sdata->vif) && 4264 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4265 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4266 goto out; 4267 4268 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4269 goto out_free; 4270 4271 if (IS_ERR(sta)) 4272 sta = NULL; 4273 4274 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4275 ieee80211_aggr_check(sdata, sta, skb); 4276 4277 if (sta) { 4278 struct ieee80211_fast_tx *fast_tx; 4279 4280 fast_tx = rcu_dereference(sta->fast_tx); 4281 4282 if (fast_tx && 4283 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4284 goto out; 4285 } 4286 4287 /* the frame could be fragmented, software-encrypted, and other 4288 * things so we cannot really handle checksum or GSO offload. 4289 * fix it up in software before we handle anything else. 4290 */ 4291 skb = ieee80211_tx_skb_fixup(skb, 0); 4292 if (!skb) { 4293 len = 0; 4294 goto out; 4295 } 4296 4297 skb_list_walk_safe(skb, skb, next) { 4298 skb_mark_not_on_list(skb); 4299 4300 if (skb->protocol == sdata->control_port_protocol) 4301 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4302 4303 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4304 sta, ctrl_flags, cookie); 4305 if (IS_ERR(skb)) { 4306 kfree_skb_list(next); 4307 goto out; 4308 } 4309 4310 dev_sw_netstats_tx_add(dev, 1, skb->len); 4311 4312 ieee80211_xmit(sdata, sta, skb); 4313 } 4314 goto out; 4315 out_free: 4316 kfree_skb(skb); 4317 len = 0; 4318 out: 4319 if (len) 4320 ieee80211_tpt_led_trig_tx(local, len); 4321 rcu_read_unlock(); 4322 } 4323 4324 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4325 { 4326 struct ethhdr *eth; 4327 int err; 4328 4329 err = skb_ensure_writable(skb, ETH_HLEN); 4330 if (unlikely(err)) 4331 return err; 4332 4333 eth = (void *)skb->data; 4334 ether_addr_copy(eth->h_dest, sta->sta.addr); 4335 4336 return 0; 4337 } 4338 4339 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4340 struct net_device *dev) 4341 { 4342 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4343 const struct ethhdr *eth = (void *)skb->data; 4344 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4345 __be16 ethertype; 4346 4347 switch (sdata->vif.type) { 4348 case NL80211_IFTYPE_AP_VLAN: 4349 if (sdata->u.vlan.sta) 4350 return false; 4351 if (sdata->wdev.use_4addr) 4352 return false; 4353 fallthrough; 4354 case NL80211_IFTYPE_AP: 4355 /* check runtime toggle for this bss */ 4356 if (!sdata->bss->multicast_to_unicast) 4357 return false; 4358 break; 4359 default: 4360 return false; 4361 } 4362 4363 /* multicast to unicast conversion only for some payload */ 4364 ethertype = eth->h_proto; 4365 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4366 ethertype = ethvlan->h_vlan_encapsulated_proto; 4367 switch (ethertype) { 4368 case htons(ETH_P_ARP): 4369 case htons(ETH_P_IP): 4370 case htons(ETH_P_IPV6): 4371 break; 4372 default: 4373 return false; 4374 } 4375 4376 return true; 4377 } 4378 4379 static void 4380 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4381 struct sk_buff_head *queue) 4382 { 4383 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4384 struct ieee80211_local *local = sdata->local; 4385 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4386 struct sta_info *sta, *first = NULL; 4387 struct sk_buff *cloned_skb; 4388 4389 rcu_read_lock(); 4390 4391 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4392 if (sdata != sta->sdata) 4393 /* AP-VLAN mismatch */ 4394 continue; 4395 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4396 /* do not send back to source */ 4397 continue; 4398 if (!first) { 4399 first = sta; 4400 continue; 4401 } 4402 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4403 if (!cloned_skb) 4404 goto multicast; 4405 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4406 dev_kfree_skb(cloned_skb); 4407 goto multicast; 4408 } 4409 __skb_queue_tail(queue, cloned_skb); 4410 } 4411 4412 if (likely(first)) { 4413 if (unlikely(ieee80211_change_da(skb, first))) 4414 goto multicast; 4415 __skb_queue_tail(queue, skb); 4416 } else { 4417 /* no STA connected, drop */ 4418 kfree_skb(skb); 4419 skb = NULL; 4420 } 4421 4422 goto out; 4423 multicast: 4424 __skb_queue_purge(queue); 4425 __skb_queue_tail(queue, skb); 4426 out: 4427 rcu_read_unlock(); 4428 } 4429 4430 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4431 struct sk_buff *skb, u32 ctrl_flags, 4432 unsigned int link_id) 4433 { 4434 struct sk_buff *out; 4435 4436 out = skb_copy(skb, GFP_ATOMIC); 4437 if (!out) 4438 return; 4439 4440 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4441 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4442 } 4443 4444 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4445 struct sk_buff *skb) 4446 { 4447 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4448 unsigned long links = sdata->vif.valid_links; 4449 unsigned int link; 4450 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4451 4452 if (hweight16(links) == 1) { 4453 ctrl_flags |= u32_encode_bits(__ffs(links), 4454 IEEE80211_TX_CTRL_MLO_LINK); 4455 4456 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4457 NULL); 4458 return; 4459 } 4460 4461 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4462 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4463 ctrl_flags = 0; 4464 } 4465 kfree_skb(skb); 4466 } 4467 4468 /** 4469 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4470 * @skb: packet to be sent 4471 * @dev: incoming interface 4472 * 4473 * On failure skb will be freed. 4474 */ 4475 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4476 struct net_device *dev) 4477 { 4478 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4479 const struct ethhdr *eth = (void *)skb->data; 4480 4481 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4482 goto normal; 4483 4484 if (unlikely(!ieee80211_sdata_running(sdata))) { 4485 kfree_skb(skb); 4486 return NETDEV_TX_OK; 4487 } 4488 4489 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4490 struct sk_buff_head queue; 4491 4492 __skb_queue_head_init(&queue); 4493 ieee80211_convert_to_unicast(skb, dev, &queue); 4494 while ((skb = __skb_dequeue(&queue))) 4495 __ieee80211_subif_start_xmit(skb, dev, 0, 4496 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4497 NULL); 4498 } else if (sdata->vif.valid_links && 4499 sdata->vif.type == NL80211_IFTYPE_AP && 4500 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4501 ieee80211_mlo_multicast_tx(dev, skb); 4502 } else { 4503 normal: 4504 __ieee80211_subif_start_xmit(skb, dev, 0, 4505 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4506 NULL); 4507 } 4508 4509 return NETDEV_TX_OK; 4510 } 4511 4512 4513 4514 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4515 struct sk_buff *skb, struct sta_info *sta, 4516 bool txpending) 4517 { 4518 struct ieee80211_local *local = sdata->local; 4519 struct ieee80211_tx_control control = {}; 4520 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4521 struct ieee80211_sta *pubsta = NULL; 4522 unsigned long flags; 4523 int q = info->hw_queue; 4524 4525 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4526 4527 if (local->queue_stop_reasons[q] || 4528 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4529 if (txpending) 4530 skb_queue_head(&local->pending[q], skb); 4531 else 4532 skb_queue_tail(&local->pending[q], skb); 4533 4534 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4535 4536 return false; 4537 } 4538 4539 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4540 4541 if (sta && sta->uploaded) 4542 pubsta = &sta->sta; 4543 4544 control.sta = pubsta; 4545 4546 drv_tx(local, &control, skb); 4547 4548 return true; 4549 } 4550 4551 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4552 struct sk_buff *skb, struct sta_info *sta, 4553 bool txpending) 4554 { 4555 struct ieee80211_local *local = sdata->local; 4556 struct sk_buff *next; 4557 bool ret = true; 4558 4559 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4560 return true; 4561 4562 skb_list_walk_safe(skb, skb, next) { 4563 skb_mark_not_on_list(skb); 4564 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4565 ret = false; 4566 } 4567 4568 return ret; 4569 } 4570 4571 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4572 struct net_device *dev, struct sta_info *sta, 4573 struct ieee80211_key *key, struct sk_buff *skb) 4574 { 4575 struct ieee80211_tx_info *info; 4576 struct ieee80211_local *local = sdata->local; 4577 struct tid_ampdu_tx *tid_tx; 4578 struct sk_buff *seg, *next; 4579 unsigned int skbs = 0, len = 0; 4580 u16 queue; 4581 u8 tid; 4582 4583 queue = ieee80211_select_queue(sdata, sta, skb); 4584 skb_set_queue_mapping(skb, queue); 4585 4586 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4587 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4588 goto out_free; 4589 4590 skb = skb_share_check(skb, GFP_ATOMIC); 4591 if (unlikely(!skb)) 4592 return; 4593 4594 ieee80211_aggr_check(sdata, sta, skb); 4595 4596 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4597 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4598 if (tid_tx) { 4599 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4600 /* fall back to non-offload slow path */ 4601 __ieee80211_subif_start_xmit(skb, dev, 0, 4602 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4603 NULL); 4604 return; 4605 } 4606 4607 if (tid_tx->timeout) 4608 tid_tx->last_tx = jiffies; 4609 } 4610 4611 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4612 if (!skb) 4613 return; 4614 4615 info = IEEE80211_SKB_CB(skb); 4616 memset(info, 0, sizeof(*info)); 4617 4618 info->hw_queue = sdata->vif.hw_queue[queue]; 4619 4620 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4621 sdata = container_of(sdata->bss, 4622 struct ieee80211_sub_if_data, u.ap); 4623 4624 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4625 info->control.vif = &sdata->vif; 4626 4627 if (key) 4628 info->control.hw_key = &key->conf; 4629 4630 skb_list_walk_safe(skb, seg, next) { 4631 skbs++; 4632 len += seg->len; 4633 if (seg != skb) 4634 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4635 } 4636 4637 if (unlikely(skb->sk && 4638 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4639 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4640 &info->flags, NULL); 4641 4642 dev_sw_netstats_tx_add(dev, skbs, len); 4643 sta->deflink.tx_stats.packets[queue] += skbs; 4644 sta->deflink.tx_stats.bytes[queue] += len; 4645 4646 ieee80211_tpt_led_trig_tx(local, len); 4647 4648 ieee80211_tx_8023(sdata, skb, sta, false); 4649 4650 return; 4651 4652 out_free: 4653 kfree_skb(skb); 4654 } 4655 4656 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4657 struct net_device *dev) 4658 { 4659 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4660 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4661 struct ieee80211_key *key; 4662 struct sta_info *sta; 4663 4664 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4665 kfree_skb(skb); 4666 return NETDEV_TX_OK; 4667 } 4668 4669 rcu_read_lock(); 4670 4671 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4672 kfree_skb(skb); 4673 goto out; 4674 } 4675 4676 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4677 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4678 sdata->control_port_protocol == ehdr->h_proto)) 4679 goto skip_offload; 4680 4681 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4682 if (!key) 4683 key = rcu_dereference(sdata->default_unicast_key); 4684 4685 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4686 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4687 goto skip_offload; 4688 4689 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4690 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4691 goto out; 4692 4693 skip_offload: 4694 ieee80211_subif_start_xmit(skb, dev); 4695 out: 4696 rcu_read_unlock(); 4697 4698 return NETDEV_TX_OK; 4699 } 4700 4701 struct sk_buff * 4702 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4703 struct sk_buff *skb, u32 info_flags) 4704 { 4705 struct ieee80211_hdr *hdr; 4706 struct ieee80211_tx_data tx = { 4707 .local = sdata->local, 4708 .sdata = sdata, 4709 }; 4710 struct sta_info *sta; 4711 4712 rcu_read_lock(); 4713 4714 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4715 kfree_skb(skb); 4716 skb = ERR_PTR(-EINVAL); 4717 goto out; 4718 } 4719 4720 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4721 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4722 if (IS_ERR(skb)) 4723 goto out; 4724 4725 hdr = (void *)skb->data; 4726 tx.sta = sta_info_get(sdata, hdr->addr1); 4727 tx.skb = skb; 4728 4729 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4730 rcu_read_unlock(); 4731 kfree_skb(skb); 4732 return ERR_PTR(-EINVAL); 4733 } 4734 4735 out: 4736 rcu_read_unlock(); 4737 return skb; 4738 } 4739 4740 /* 4741 * ieee80211_clear_tx_pending may not be called in a context where 4742 * it is possible that it packets could come in again. 4743 */ 4744 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4745 { 4746 struct sk_buff *skb; 4747 int i; 4748 4749 for (i = 0; i < local->hw.queues; i++) { 4750 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4751 ieee80211_free_txskb(&local->hw, skb); 4752 } 4753 } 4754 4755 /* 4756 * Returns false if the frame couldn't be transmitted but was queued instead, 4757 * which in this case means re-queued -- take as an indication to stop sending 4758 * more pending frames. 4759 */ 4760 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4761 struct sk_buff *skb) 4762 { 4763 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4764 struct ieee80211_sub_if_data *sdata; 4765 struct sta_info *sta; 4766 struct ieee80211_hdr *hdr; 4767 bool result; 4768 struct ieee80211_chanctx_conf *chanctx_conf; 4769 4770 sdata = vif_to_sdata(info->control.vif); 4771 4772 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4773 /* update band only for non-MLD */ 4774 if (!sdata->vif.valid_links) { 4775 chanctx_conf = 4776 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4777 if (unlikely(!chanctx_conf)) { 4778 dev_kfree_skb(skb); 4779 return true; 4780 } 4781 info->band = chanctx_conf->def.chan->band; 4782 } 4783 result = ieee80211_tx(sdata, NULL, skb, true); 4784 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4785 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4786 dev_kfree_skb(skb); 4787 return true; 4788 } 4789 4790 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4791 sta = NULL; 4792 4793 result = ieee80211_tx_8023(sdata, skb, sta, true); 4794 } else { 4795 struct sk_buff_head skbs; 4796 4797 __skb_queue_head_init(&skbs); 4798 __skb_queue_tail(&skbs, skb); 4799 4800 hdr = (struct ieee80211_hdr *)skb->data; 4801 sta = sta_info_get(sdata, hdr->addr1); 4802 4803 result = __ieee80211_tx(local, &skbs, sta, true); 4804 } 4805 4806 return result; 4807 } 4808 4809 /* 4810 * Transmit all pending packets. Called from tasklet. 4811 */ 4812 void ieee80211_tx_pending(struct tasklet_struct *t) 4813 { 4814 struct ieee80211_local *local = from_tasklet(local, t, 4815 tx_pending_tasklet); 4816 unsigned long flags; 4817 int i; 4818 bool txok; 4819 4820 rcu_read_lock(); 4821 4822 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4823 for (i = 0; i < local->hw.queues; i++) { 4824 /* 4825 * If queue is stopped by something other than due to pending 4826 * frames, or we have no pending frames, proceed to next queue. 4827 */ 4828 if (local->queue_stop_reasons[i] || 4829 skb_queue_empty(&local->pending[i])) 4830 continue; 4831 4832 while (!skb_queue_empty(&local->pending[i])) { 4833 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4834 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4835 4836 if (WARN_ON(!info->control.vif)) { 4837 ieee80211_free_txskb(&local->hw, skb); 4838 continue; 4839 } 4840 4841 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4842 flags); 4843 4844 txok = ieee80211_tx_pending_skb(local, skb); 4845 spin_lock_irqsave(&local->queue_stop_reason_lock, 4846 flags); 4847 if (!txok) 4848 break; 4849 } 4850 } 4851 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4852 4853 rcu_read_unlock(); 4854 } 4855 4856 /* functions for drivers to get certain frames */ 4857 4858 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4859 struct ieee80211_link_data *link, 4860 struct ps_data *ps, struct sk_buff *skb, 4861 bool is_template) 4862 { 4863 u8 *pos, *tim; 4864 int aid0 = 0; 4865 int i, have_bits = 0, n1, n2; 4866 struct ieee80211_bss_conf *link_conf = link->conf; 4867 4868 /* Generate bitmap for TIM only if there are any STAs in power save 4869 * mode. */ 4870 if (atomic_read(&ps->num_sta_ps) > 0) 4871 /* in the hope that this is faster than 4872 * checking byte-for-byte */ 4873 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4874 IEEE80211_MAX_AID+1); 4875 if (!is_template) { 4876 if (ps->dtim_count == 0) 4877 ps->dtim_count = link_conf->dtim_period - 1; 4878 else 4879 ps->dtim_count--; 4880 } 4881 4882 tim = pos = skb_put(skb, 5); 4883 *pos++ = WLAN_EID_TIM; 4884 *pos++ = 3; 4885 *pos++ = ps->dtim_count; 4886 *pos++ = link_conf->dtim_period; 4887 4888 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4889 aid0 = 1; 4890 4891 ps->dtim_bc_mc = aid0 == 1; 4892 4893 if (have_bits) { 4894 /* Find largest even number N1 so that bits numbered 1 through 4895 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4896 * (N2 + 1) x 8 through 2007 are 0. */ 4897 n1 = 0; 4898 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4899 if (ps->tim[i]) { 4900 n1 = i & 0xfe; 4901 break; 4902 } 4903 } 4904 n2 = n1; 4905 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4906 if (ps->tim[i]) { 4907 n2 = i; 4908 break; 4909 } 4910 } 4911 4912 /* Bitmap control */ 4913 *pos++ = n1 | aid0; 4914 /* Part Virt Bitmap */ 4915 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4916 4917 tim[1] = n2 - n1 + 4; 4918 } else { 4919 *pos++ = aid0; /* Bitmap control */ 4920 4921 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4922 tim[1] = 4; 4923 /* Part Virt Bitmap */ 4924 skb_put_u8(skb, 0); 4925 } 4926 } 4927 } 4928 4929 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4930 struct ieee80211_link_data *link, 4931 struct ps_data *ps, struct sk_buff *skb, 4932 bool is_template) 4933 { 4934 struct ieee80211_local *local = sdata->local; 4935 4936 /* 4937 * Not very nice, but we want to allow the driver to call 4938 * ieee80211_beacon_get() as a response to the set_tim() 4939 * callback. That, however, is already invoked under the 4940 * sta_lock to guarantee consistent and race-free update 4941 * of the tim bitmap in mac80211 and the driver. 4942 */ 4943 if (local->tim_in_locked_section) { 4944 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4945 } else { 4946 spin_lock_bh(&local->tim_lock); 4947 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4948 spin_unlock_bh(&local->tim_lock); 4949 } 4950 4951 return 0; 4952 } 4953 4954 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4955 struct beacon_data *beacon, 4956 struct ieee80211_link_data *link) 4957 { 4958 u8 *beacon_data, count, max_count = 1; 4959 struct probe_resp *resp; 4960 size_t beacon_data_len; 4961 u16 *bcn_offsets; 4962 int i; 4963 4964 switch (sdata->vif.type) { 4965 case NL80211_IFTYPE_AP: 4966 beacon_data = beacon->tail; 4967 beacon_data_len = beacon->tail_len; 4968 break; 4969 case NL80211_IFTYPE_ADHOC: 4970 beacon_data = beacon->head; 4971 beacon_data_len = beacon->head_len; 4972 break; 4973 case NL80211_IFTYPE_MESH_POINT: 4974 beacon_data = beacon->head; 4975 beacon_data_len = beacon->head_len; 4976 break; 4977 default: 4978 return; 4979 } 4980 4981 resp = rcu_dereference(link->u.ap.probe_resp); 4982 4983 bcn_offsets = beacon->cntdwn_counter_offsets; 4984 count = beacon->cntdwn_current_counter; 4985 if (link->conf->csa_active) 4986 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4987 4988 for (i = 0; i < max_count; ++i) { 4989 if (bcn_offsets[i]) { 4990 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 4991 return; 4992 beacon_data[bcn_offsets[i]] = count; 4993 } 4994 4995 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4996 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4997 4998 resp->data[resp_offsets[i]] = count; 4999 } 5000 } 5001 } 5002 5003 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 5004 { 5005 beacon->cntdwn_current_counter--; 5006 5007 /* the counter should never reach 0 */ 5008 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 5009 5010 return beacon->cntdwn_current_counter; 5011 } 5012 5013 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 5014 { 5015 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5016 struct beacon_data *beacon = NULL; 5017 u8 count = 0; 5018 5019 rcu_read_lock(); 5020 5021 if (sdata->vif.type == NL80211_IFTYPE_AP) 5022 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5023 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5024 beacon = rcu_dereference(sdata->u.ibss.presp); 5025 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5026 beacon = rcu_dereference(sdata->u.mesh.beacon); 5027 5028 if (!beacon) 5029 goto unlock; 5030 5031 count = __ieee80211_beacon_update_cntdwn(beacon); 5032 5033 unlock: 5034 rcu_read_unlock(); 5035 return count; 5036 } 5037 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5038 5039 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5040 { 5041 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5042 struct beacon_data *beacon = NULL; 5043 5044 rcu_read_lock(); 5045 5046 if (sdata->vif.type == NL80211_IFTYPE_AP) 5047 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5048 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5049 beacon = rcu_dereference(sdata->u.ibss.presp); 5050 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5051 beacon = rcu_dereference(sdata->u.mesh.beacon); 5052 5053 if (!beacon) 5054 goto unlock; 5055 5056 if (counter < beacon->cntdwn_current_counter) 5057 beacon->cntdwn_current_counter = counter; 5058 5059 unlock: 5060 rcu_read_unlock(); 5061 } 5062 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5063 5064 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 5065 { 5066 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5067 struct beacon_data *beacon = NULL; 5068 u8 *beacon_data; 5069 size_t beacon_data_len; 5070 int ret = false; 5071 5072 if (!ieee80211_sdata_running(sdata)) 5073 return false; 5074 5075 rcu_read_lock(); 5076 if (vif->type == NL80211_IFTYPE_AP) { 5077 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5078 if (WARN_ON(!beacon || !beacon->tail)) 5079 goto out; 5080 beacon_data = beacon->tail; 5081 beacon_data_len = beacon->tail_len; 5082 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5083 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5084 5085 beacon = rcu_dereference(ifibss->presp); 5086 if (!beacon) 5087 goto out; 5088 5089 beacon_data = beacon->head; 5090 beacon_data_len = beacon->head_len; 5091 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5092 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5093 5094 beacon = rcu_dereference(ifmsh->beacon); 5095 if (!beacon) 5096 goto out; 5097 5098 beacon_data = beacon->head; 5099 beacon_data_len = beacon->head_len; 5100 } else { 5101 WARN_ON(1); 5102 goto out; 5103 } 5104 5105 if (!beacon->cntdwn_counter_offsets[0]) 5106 goto out; 5107 5108 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5109 goto out; 5110 5111 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5112 ret = true; 5113 5114 out: 5115 rcu_read_unlock(); 5116 5117 return ret; 5118 } 5119 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5120 5121 static int ieee80211_beacon_protect(struct sk_buff *skb, 5122 struct ieee80211_local *local, 5123 struct ieee80211_sub_if_data *sdata, 5124 struct ieee80211_link_data *link) 5125 { 5126 ieee80211_tx_result res; 5127 struct ieee80211_tx_data tx; 5128 struct sk_buff *check_skb; 5129 5130 memset(&tx, 0, sizeof(tx)); 5131 tx.key = rcu_dereference(link->default_beacon_key); 5132 if (!tx.key) 5133 return 0; 5134 5135 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5136 tx.key = NULL; 5137 return -EINVAL; 5138 } 5139 5140 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5141 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5142 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5143 5144 tx.local = local; 5145 tx.sdata = sdata; 5146 __skb_queue_head_init(&tx.skbs); 5147 __skb_queue_tail(&tx.skbs, skb); 5148 res = ieee80211_tx_h_encrypt(&tx); 5149 check_skb = __skb_dequeue(&tx.skbs); 5150 /* we may crash after this, but it'd be a bug in crypto */ 5151 WARN_ON(check_skb != skb); 5152 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5153 return -EINVAL; 5154 5155 return 0; 5156 } 5157 5158 static void 5159 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5160 struct ieee80211_vif *vif, 5161 struct ieee80211_link_data *link, 5162 struct ieee80211_mutable_offsets *offs, 5163 struct beacon_data *beacon, 5164 struct sk_buff *skb, 5165 struct ieee80211_chanctx_conf *chanctx_conf, 5166 u16 csa_off_base) 5167 { 5168 struct ieee80211_local *local = hw_to_local(hw); 5169 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5170 struct ieee80211_tx_info *info; 5171 enum nl80211_band band; 5172 struct ieee80211_tx_rate_control txrc; 5173 5174 /* CSA offsets */ 5175 if (offs && beacon) { 5176 u16 i; 5177 5178 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5179 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5180 5181 if (!csa_off) 5182 continue; 5183 5184 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5185 } 5186 } 5187 5188 band = chanctx_conf->def.chan->band; 5189 info = IEEE80211_SKB_CB(skb); 5190 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5191 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5192 info->band = band; 5193 5194 memset(&txrc, 0, sizeof(txrc)); 5195 txrc.hw = hw; 5196 txrc.sband = local->hw.wiphy->bands[band]; 5197 txrc.bss_conf = link->conf; 5198 txrc.skb = skb; 5199 txrc.reported_rate.idx = -1; 5200 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5201 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5202 else 5203 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5204 txrc.bss = true; 5205 rate_control_get_rate(sdata, NULL, &txrc); 5206 5207 info->control.vif = vif; 5208 info->control.flags |= u32_encode_bits(link->link_id, 5209 IEEE80211_TX_CTRL_MLO_LINK); 5210 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5211 IEEE80211_TX_CTL_ASSIGN_SEQ | 5212 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5213 } 5214 5215 static void 5216 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5217 u8 i) 5218 { 5219 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5220 i > beacon->mbssid_ies->cnt) 5221 return; 5222 5223 if (i < beacon->mbssid_ies->cnt) { 5224 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5225 beacon->mbssid_ies->elem[i].len); 5226 5227 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5228 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5229 beacon->rnr_ies->elem[i].len); 5230 5231 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5232 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5233 beacon->rnr_ies->elem[i].len); 5234 } 5235 return; 5236 } 5237 5238 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5239 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5240 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5241 beacon->mbssid_ies->elem[i].len); 5242 } 5243 5244 static struct sk_buff * 5245 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5246 struct ieee80211_vif *vif, 5247 struct ieee80211_link_data *link, 5248 struct ieee80211_mutable_offsets *offs, 5249 bool is_template, 5250 struct beacon_data *beacon, 5251 struct ieee80211_chanctx_conf *chanctx_conf, 5252 u8 ema_index) 5253 { 5254 struct ieee80211_local *local = hw_to_local(hw); 5255 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5256 struct ieee80211_if_ap *ap = &sdata->u.ap; 5257 struct sk_buff *skb = NULL; 5258 u16 csa_off_base = 0; 5259 int mbssid_len; 5260 5261 if (beacon->cntdwn_counter_offsets[0]) { 5262 if (!is_template) 5263 ieee80211_beacon_update_cntdwn(vif); 5264 5265 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5266 } 5267 5268 /* headroom, head length, 5269 * tail length, maximum TIM length and multiple BSSID length 5270 */ 5271 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5272 beacon->rnr_ies, 5273 ema_index); 5274 5275 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5276 beacon->tail_len + 256 + 5277 local->hw.extra_beacon_tailroom + mbssid_len); 5278 if (!skb) 5279 return NULL; 5280 5281 skb_reserve(skb, local->tx_headroom); 5282 skb_put_data(skb, beacon->head, beacon->head_len); 5283 5284 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5285 5286 if (offs) { 5287 offs->tim_offset = beacon->head_len; 5288 offs->tim_length = skb->len - beacon->head_len; 5289 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5290 5291 if (mbssid_len) { 5292 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5293 offs->mbssid_off = skb->len - mbssid_len; 5294 } 5295 5296 /* for AP the csa offsets are from tail */ 5297 csa_off_base = skb->len; 5298 } 5299 5300 if (beacon->tail) 5301 skb_put_data(skb, beacon->tail, beacon->tail_len); 5302 5303 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5304 return NULL; 5305 5306 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5307 chanctx_conf, csa_off_base); 5308 return skb; 5309 } 5310 5311 static struct ieee80211_ema_beacons * 5312 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5313 struct ieee80211_vif *vif, 5314 struct ieee80211_link_data *link, 5315 struct ieee80211_mutable_offsets *offs, 5316 bool is_template, struct beacon_data *beacon, 5317 struct ieee80211_chanctx_conf *chanctx_conf) 5318 { 5319 struct ieee80211_ema_beacons *ema = NULL; 5320 5321 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5322 return NULL; 5323 5324 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5325 GFP_ATOMIC); 5326 if (!ema) 5327 return NULL; 5328 5329 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5330 ema->bcn[ema->cnt].skb = 5331 ieee80211_beacon_get_ap(hw, vif, link, 5332 &ema->bcn[ema->cnt].offs, 5333 is_template, beacon, 5334 chanctx_conf, ema->cnt); 5335 if (!ema->bcn[ema->cnt].skb) 5336 break; 5337 } 5338 5339 if (ema->cnt == beacon->mbssid_ies->cnt) 5340 return ema; 5341 5342 ieee80211_beacon_free_ema_list(ema); 5343 return NULL; 5344 } 5345 5346 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5347 5348 static struct sk_buff * 5349 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5350 struct ieee80211_vif *vif, 5351 struct ieee80211_mutable_offsets *offs, 5352 bool is_template, 5353 unsigned int link_id, 5354 int ema_index, 5355 struct ieee80211_ema_beacons **ema_beacons) 5356 { 5357 struct ieee80211_local *local = hw_to_local(hw); 5358 struct beacon_data *beacon = NULL; 5359 struct sk_buff *skb = NULL; 5360 struct ieee80211_sub_if_data *sdata = NULL; 5361 struct ieee80211_chanctx_conf *chanctx_conf; 5362 struct ieee80211_link_data *link; 5363 5364 rcu_read_lock(); 5365 5366 sdata = vif_to_sdata(vif); 5367 link = rcu_dereference(sdata->link[link_id]); 5368 if (!link) 5369 goto out; 5370 chanctx_conf = 5371 rcu_dereference(link->conf->chanctx_conf); 5372 5373 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5374 goto out; 5375 5376 if (offs) 5377 memset(offs, 0, sizeof(*offs)); 5378 5379 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5380 beacon = rcu_dereference(link->u.ap.beacon); 5381 if (!beacon) 5382 goto out; 5383 5384 if (ema_beacons) { 5385 *ema_beacons = 5386 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5387 offs, 5388 is_template, 5389 beacon, 5390 chanctx_conf); 5391 } else { 5392 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5393 if (ema_index >= beacon->mbssid_ies->cnt) 5394 goto out; /* End of MBSSID elements */ 5395 5396 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5397 ema_index = beacon->mbssid_ies->cnt; 5398 } else { 5399 ema_index = 0; 5400 } 5401 5402 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5403 is_template, beacon, 5404 chanctx_conf, 5405 ema_index); 5406 } 5407 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5408 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5409 struct ieee80211_hdr *hdr; 5410 5411 beacon = rcu_dereference(ifibss->presp); 5412 if (!beacon) 5413 goto out; 5414 5415 if (beacon->cntdwn_counter_offsets[0]) { 5416 if (!is_template) 5417 __ieee80211_beacon_update_cntdwn(beacon); 5418 5419 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5420 } 5421 5422 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5423 local->hw.extra_beacon_tailroom); 5424 if (!skb) 5425 goto out; 5426 skb_reserve(skb, local->tx_headroom); 5427 skb_put_data(skb, beacon->head, beacon->head_len); 5428 5429 hdr = (struct ieee80211_hdr *) skb->data; 5430 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5431 IEEE80211_STYPE_BEACON); 5432 5433 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5434 chanctx_conf, 0); 5435 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5436 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5437 5438 beacon = rcu_dereference(ifmsh->beacon); 5439 if (!beacon) 5440 goto out; 5441 5442 if (beacon->cntdwn_counter_offsets[0]) { 5443 if (!is_template) 5444 /* TODO: For mesh csa_counter is in TU, so 5445 * decrementing it by one isn't correct, but 5446 * for now we leave it consistent with overall 5447 * mac80211's behavior. 5448 */ 5449 __ieee80211_beacon_update_cntdwn(beacon); 5450 5451 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5452 } 5453 5454 if (ifmsh->sync_ops) 5455 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5456 5457 skb = dev_alloc_skb(local->tx_headroom + 5458 beacon->head_len + 5459 256 + /* TIM IE */ 5460 beacon->tail_len + 5461 local->hw.extra_beacon_tailroom); 5462 if (!skb) 5463 goto out; 5464 skb_reserve(skb, local->tx_headroom); 5465 skb_put_data(skb, beacon->head, beacon->head_len); 5466 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5467 is_template); 5468 5469 if (offs) { 5470 offs->tim_offset = beacon->head_len; 5471 offs->tim_length = skb->len - beacon->head_len; 5472 } 5473 5474 skb_put_data(skb, beacon->tail, beacon->tail_len); 5475 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5476 chanctx_conf, 0); 5477 } else { 5478 WARN_ON(1); 5479 goto out; 5480 } 5481 5482 out: 5483 rcu_read_unlock(); 5484 return skb; 5485 5486 } 5487 5488 struct sk_buff * 5489 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5490 struct ieee80211_vif *vif, 5491 struct ieee80211_mutable_offsets *offs, 5492 unsigned int link_id) 5493 { 5494 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5495 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5496 } 5497 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5498 5499 struct sk_buff * 5500 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5501 struct ieee80211_vif *vif, 5502 struct ieee80211_mutable_offsets *offs, 5503 unsigned int link_id, u8 ema_index) 5504 { 5505 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5506 NULL); 5507 } 5508 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5509 5510 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5511 { 5512 u8 i; 5513 5514 if (!ema_beacons) 5515 return; 5516 5517 for (i = 0; i < ema_beacons->cnt; i++) 5518 kfree_skb(ema_beacons->bcn[i].skb); 5519 5520 kfree(ema_beacons); 5521 } 5522 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5523 5524 struct ieee80211_ema_beacons * 5525 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5526 struct ieee80211_vif *vif, 5527 unsigned int link_id) 5528 { 5529 struct ieee80211_ema_beacons *ema_beacons = NULL; 5530 5531 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, false, link_id, 0, 5532 &ema_beacons)); 5533 5534 return ema_beacons; 5535 } 5536 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5537 5538 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5539 struct ieee80211_vif *vif, 5540 u16 *tim_offset, u16 *tim_length, 5541 unsigned int link_id) 5542 { 5543 struct ieee80211_mutable_offsets offs = {}; 5544 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5545 link_id, 5546 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5547 NULL); 5548 struct sk_buff *copy; 5549 int shift; 5550 5551 if (!bcn) 5552 return bcn; 5553 5554 if (tim_offset) 5555 *tim_offset = offs.tim_offset; 5556 5557 if (tim_length) 5558 *tim_length = offs.tim_length; 5559 5560 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5561 !hw_to_local(hw)->monitors) 5562 return bcn; 5563 5564 /* send a copy to monitor interfaces */ 5565 copy = skb_copy(bcn, GFP_ATOMIC); 5566 if (!copy) 5567 return bcn; 5568 5569 shift = ieee80211_vif_get_shift(vif); 5570 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5571 5572 return bcn; 5573 } 5574 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5575 5576 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5577 struct ieee80211_vif *vif) 5578 { 5579 struct sk_buff *skb = NULL; 5580 struct probe_resp *presp = NULL; 5581 struct ieee80211_hdr *hdr; 5582 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5583 5584 if (sdata->vif.type != NL80211_IFTYPE_AP) 5585 return NULL; 5586 5587 rcu_read_lock(); 5588 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5589 if (!presp) 5590 goto out; 5591 5592 skb = dev_alloc_skb(presp->len); 5593 if (!skb) 5594 goto out; 5595 5596 skb_put_data(skb, presp->data, presp->len); 5597 5598 hdr = (struct ieee80211_hdr *) skb->data; 5599 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5600 5601 out: 5602 rcu_read_unlock(); 5603 return skb; 5604 } 5605 EXPORT_SYMBOL(ieee80211_proberesp_get); 5606 5607 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5608 struct ieee80211_vif *vif) 5609 { 5610 struct sk_buff *skb = NULL; 5611 struct fils_discovery_data *tmpl = NULL; 5612 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5613 5614 if (sdata->vif.type != NL80211_IFTYPE_AP) 5615 return NULL; 5616 5617 rcu_read_lock(); 5618 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5619 if (!tmpl) { 5620 rcu_read_unlock(); 5621 return NULL; 5622 } 5623 5624 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5625 if (skb) { 5626 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5627 skb_put_data(skb, tmpl->data, tmpl->len); 5628 } 5629 5630 rcu_read_unlock(); 5631 return skb; 5632 } 5633 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5634 5635 struct sk_buff * 5636 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5637 struct ieee80211_vif *vif) 5638 { 5639 struct sk_buff *skb = NULL; 5640 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5641 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5642 5643 if (sdata->vif.type != NL80211_IFTYPE_AP) 5644 return NULL; 5645 5646 rcu_read_lock(); 5647 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5648 if (!tmpl) { 5649 rcu_read_unlock(); 5650 return NULL; 5651 } 5652 5653 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5654 if (skb) { 5655 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5656 skb_put_data(skb, tmpl->data, tmpl->len); 5657 } 5658 5659 rcu_read_unlock(); 5660 return skb; 5661 } 5662 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5663 5664 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5665 struct ieee80211_vif *vif) 5666 { 5667 struct ieee80211_sub_if_data *sdata; 5668 struct ieee80211_pspoll *pspoll; 5669 struct ieee80211_local *local; 5670 struct sk_buff *skb; 5671 5672 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5673 return NULL; 5674 5675 sdata = vif_to_sdata(vif); 5676 local = sdata->local; 5677 5678 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5679 if (!skb) 5680 return NULL; 5681 5682 skb_reserve(skb, local->hw.extra_tx_headroom); 5683 5684 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5685 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5686 IEEE80211_STYPE_PSPOLL); 5687 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5688 5689 /* aid in PS-Poll has its two MSBs each set to 1 */ 5690 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5691 5692 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5693 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5694 5695 return skb; 5696 } 5697 EXPORT_SYMBOL(ieee80211_pspoll_get); 5698 5699 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5700 struct ieee80211_vif *vif, 5701 int link_id, bool qos_ok) 5702 { 5703 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5704 struct ieee80211_local *local = sdata->local; 5705 struct ieee80211_link_data *link = NULL; 5706 struct ieee80211_hdr_3addr *nullfunc; 5707 struct sk_buff *skb; 5708 bool qos = false; 5709 5710 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5711 return NULL; 5712 5713 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5714 sizeof(*nullfunc) + 2); 5715 if (!skb) 5716 return NULL; 5717 5718 rcu_read_lock(); 5719 if (qos_ok) { 5720 struct sta_info *sta; 5721 5722 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5723 qos = sta && sta->sta.wme; 5724 } 5725 5726 if (link_id >= 0) { 5727 link = rcu_dereference(sdata->link[link_id]); 5728 if (WARN_ON_ONCE(!link)) { 5729 rcu_read_unlock(); 5730 kfree_skb(skb); 5731 return NULL; 5732 } 5733 } 5734 5735 skb_reserve(skb, local->hw.extra_tx_headroom); 5736 5737 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5738 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5739 IEEE80211_STYPE_NULLFUNC | 5740 IEEE80211_FCTL_TODS); 5741 if (qos) { 5742 __le16 qoshdr = cpu_to_le16(7); 5743 5744 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5745 IEEE80211_STYPE_NULLFUNC) != 5746 IEEE80211_STYPE_QOS_NULLFUNC); 5747 nullfunc->frame_control |= 5748 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5749 skb->priority = 7; 5750 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5751 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5752 } 5753 5754 if (link) { 5755 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5756 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5757 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5758 } else { 5759 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5760 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5761 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5762 } 5763 rcu_read_unlock(); 5764 5765 return skb; 5766 } 5767 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5768 5769 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5770 const u8 *src_addr, 5771 const u8 *ssid, size_t ssid_len, 5772 size_t tailroom) 5773 { 5774 struct ieee80211_local *local = hw_to_local(hw); 5775 struct ieee80211_hdr_3addr *hdr; 5776 struct sk_buff *skb; 5777 size_t ie_ssid_len; 5778 u8 *pos; 5779 5780 ie_ssid_len = 2 + ssid_len; 5781 5782 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5783 ie_ssid_len + tailroom); 5784 if (!skb) 5785 return NULL; 5786 5787 skb_reserve(skb, local->hw.extra_tx_headroom); 5788 5789 hdr = skb_put_zero(skb, sizeof(*hdr)); 5790 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5791 IEEE80211_STYPE_PROBE_REQ); 5792 eth_broadcast_addr(hdr->addr1); 5793 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5794 eth_broadcast_addr(hdr->addr3); 5795 5796 pos = skb_put(skb, ie_ssid_len); 5797 *pos++ = WLAN_EID_SSID; 5798 *pos++ = ssid_len; 5799 if (ssid_len) 5800 memcpy(pos, ssid, ssid_len); 5801 pos += ssid_len; 5802 5803 return skb; 5804 } 5805 EXPORT_SYMBOL(ieee80211_probereq_get); 5806 5807 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5808 const void *frame, size_t frame_len, 5809 const struct ieee80211_tx_info *frame_txctl, 5810 struct ieee80211_rts *rts) 5811 { 5812 const struct ieee80211_hdr *hdr = frame; 5813 5814 rts->frame_control = 5815 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5816 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5817 frame_txctl); 5818 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5819 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5820 } 5821 EXPORT_SYMBOL(ieee80211_rts_get); 5822 5823 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5824 const void *frame, size_t frame_len, 5825 const struct ieee80211_tx_info *frame_txctl, 5826 struct ieee80211_cts *cts) 5827 { 5828 const struct ieee80211_hdr *hdr = frame; 5829 5830 cts->frame_control = 5831 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5832 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5833 frame_len, frame_txctl); 5834 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5835 } 5836 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5837 5838 struct sk_buff * 5839 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5840 struct ieee80211_vif *vif) 5841 { 5842 struct ieee80211_local *local = hw_to_local(hw); 5843 struct sk_buff *skb = NULL; 5844 struct ieee80211_tx_data tx; 5845 struct ieee80211_sub_if_data *sdata; 5846 struct ps_data *ps; 5847 struct ieee80211_tx_info *info; 5848 struct ieee80211_chanctx_conf *chanctx_conf; 5849 5850 sdata = vif_to_sdata(vif); 5851 5852 rcu_read_lock(); 5853 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5854 5855 if (!chanctx_conf) 5856 goto out; 5857 5858 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5859 struct beacon_data *beacon = 5860 rcu_dereference(sdata->deflink.u.ap.beacon); 5861 5862 if (!beacon || !beacon->head) 5863 goto out; 5864 5865 ps = &sdata->u.ap.ps; 5866 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5867 ps = &sdata->u.mesh.ps; 5868 } else { 5869 goto out; 5870 } 5871 5872 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5873 goto out; /* send buffered bc/mc only after DTIM beacon */ 5874 5875 while (1) { 5876 skb = skb_dequeue(&ps->bc_buf); 5877 if (!skb) 5878 goto out; 5879 local->total_ps_buffered--; 5880 5881 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5882 struct ieee80211_hdr *hdr = 5883 (struct ieee80211_hdr *) skb->data; 5884 /* more buffered multicast/broadcast frames ==> set 5885 * MoreData flag in IEEE 802.11 header to inform PS 5886 * STAs */ 5887 hdr->frame_control |= 5888 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5889 } 5890 5891 if (sdata->vif.type == NL80211_IFTYPE_AP) 5892 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5893 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5894 break; 5895 ieee80211_free_txskb(hw, skb); 5896 } 5897 5898 info = IEEE80211_SKB_CB(skb); 5899 5900 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5901 info->band = chanctx_conf->def.chan->band; 5902 5903 if (invoke_tx_handlers(&tx)) 5904 skb = NULL; 5905 out: 5906 rcu_read_unlock(); 5907 5908 return skb; 5909 } 5910 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5911 5912 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5913 { 5914 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5915 struct ieee80211_sub_if_data *sdata = sta->sdata; 5916 struct ieee80211_local *local = sdata->local; 5917 int ret; 5918 u32 queues; 5919 5920 lockdep_assert_held(&local->sta_mtx); 5921 5922 /* only some cases are supported right now */ 5923 switch (sdata->vif.type) { 5924 case NL80211_IFTYPE_STATION: 5925 case NL80211_IFTYPE_AP: 5926 case NL80211_IFTYPE_AP_VLAN: 5927 break; 5928 default: 5929 WARN_ON(1); 5930 return -EINVAL; 5931 } 5932 5933 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5934 return -EINVAL; 5935 5936 if (sta->reserved_tid == tid) { 5937 ret = 0; 5938 goto out; 5939 } 5940 5941 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5942 sdata_err(sdata, "TID reservation already active\n"); 5943 ret = -EALREADY; 5944 goto out; 5945 } 5946 5947 ieee80211_stop_vif_queues(sdata->local, sdata, 5948 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5949 5950 synchronize_net(); 5951 5952 /* Tear down BA sessions so we stop aggregating on this TID */ 5953 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5954 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5955 __ieee80211_stop_tx_ba_session(sta, tid, 5956 AGG_STOP_LOCAL_REQUEST); 5957 } 5958 5959 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5960 __ieee80211_flush_queues(local, sdata, queues, false); 5961 5962 sta->reserved_tid = tid; 5963 5964 ieee80211_wake_vif_queues(local, sdata, 5965 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5966 5967 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5968 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5969 5970 ret = 0; 5971 out: 5972 return ret; 5973 } 5974 EXPORT_SYMBOL(ieee80211_reserve_tid); 5975 5976 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5977 { 5978 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5979 struct ieee80211_sub_if_data *sdata = sta->sdata; 5980 5981 lockdep_assert_held(&sdata->local->sta_mtx); 5982 5983 /* only some cases are supported right now */ 5984 switch (sdata->vif.type) { 5985 case NL80211_IFTYPE_STATION: 5986 case NL80211_IFTYPE_AP: 5987 case NL80211_IFTYPE_AP_VLAN: 5988 break; 5989 default: 5990 WARN_ON(1); 5991 return; 5992 } 5993 5994 if (tid != sta->reserved_tid) { 5995 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5996 return; 5997 } 5998 5999 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6000 } 6001 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6002 6003 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6004 struct sk_buff *skb, int tid, int link_id, 6005 enum nl80211_band band) 6006 { 6007 const struct ieee80211_hdr *hdr = (void *)skb->data; 6008 int ac = ieee80211_ac_from_tid(tid); 6009 unsigned int link; 6010 6011 skb_reset_mac_header(skb); 6012 skb_set_queue_mapping(skb, ac); 6013 skb->priority = tid; 6014 6015 skb->dev = sdata->dev; 6016 6017 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6018 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6019 IEEE80211_LINK_UNSPECIFIED)); 6020 6021 if (!sdata->vif.valid_links) { 6022 link = 0; 6023 } else if (link_id >= 0) { 6024 link = link_id; 6025 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6026 /* address from the MLD */ 6027 link = IEEE80211_LINK_UNSPECIFIED; 6028 } else { 6029 /* otherwise must be addressed from a link */ 6030 rcu_read_lock(); 6031 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6032 struct ieee80211_bss_conf *link_conf; 6033 6034 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6035 if (!link_conf) 6036 continue; 6037 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6038 break; 6039 } 6040 rcu_read_unlock(); 6041 6042 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6043 link = ffs(sdata->vif.valid_links) - 1; 6044 } 6045 6046 IEEE80211_SKB_CB(skb)->control.flags |= 6047 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6048 6049 /* 6050 * The other path calling ieee80211_xmit is from the tasklet, 6051 * and while we can handle concurrent transmissions locking 6052 * requirements are that we do not come into tx with bhs on. 6053 */ 6054 local_bh_disable(); 6055 IEEE80211_SKB_CB(skb)->band = band; 6056 ieee80211_xmit(sdata, NULL, skb); 6057 local_bh_enable(); 6058 } 6059 6060 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6061 struct sk_buff *skb, int tid, int link_id) 6062 { 6063 struct ieee80211_chanctx_conf *chanctx_conf; 6064 enum nl80211_band band; 6065 6066 rcu_read_lock(); 6067 if (!sdata->vif.valid_links) { 6068 WARN_ON(link_id >= 0); 6069 chanctx_conf = 6070 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6071 if (WARN_ON(!chanctx_conf)) { 6072 rcu_read_unlock(); 6073 kfree_skb(skb); 6074 return; 6075 } 6076 band = chanctx_conf->def.chan->band; 6077 } else { 6078 WARN_ON(link_id >= 0 && 6079 !(sdata->vif.valid_links & BIT(link_id))); 6080 /* MLD transmissions must not rely on the band */ 6081 band = 0; 6082 } 6083 6084 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6085 rcu_read_unlock(); 6086 } 6087 6088 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6089 const u8 *buf, size_t len, 6090 const u8 *dest, __be16 proto, bool unencrypted, 6091 int link_id, u64 *cookie) 6092 { 6093 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6094 struct ieee80211_local *local = sdata->local; 6095 struct sta_info *sta; 6096 struct sk_buff *skb; 6097 struct ethhdr *ehdr; 6098 u32 ctrl_flags = 0; 6099 u32 flags = 0; 6100 int err; 6101 6102 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6103 * or Pre-Authentication 6104 */ 6105 if (proto != sdata->control_port_protocol && 6106 proto != cpu_to_be16(ETH_P_PREAUTH)) 6107 return -EINVAL; 6108 6109 if (proto == sdata->control_port_protocol) 6110 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6111 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6112 6113 if (unencrypted) 6114 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6115 6116 if (cookie) 6117 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6118 6119 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6120 6121 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6122 sizeof(struct ethhdr) + len); 6123 if (!skb) 6124 return -ENOMEM; 6125 6126 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6127 6128 skb_put_data(skb, buf, len); 6129 6130 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6131 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6132 6133 /* we may override the SA for MLO STA later */ 6134 if (link_id < 0) { 6135 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6136 IEEE80211_TX_CTRL_MLO_LINK); 6137 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6138 } else { 6139 struct ieee80211_bss_conf *link_conf; 6140 6141 ctrl_flags |= u32_encode_bits(link_id, 6142 IEEE80211_TX_CTRL_MLO_LINK); 6143 6144 rcu_read_lock(); 6145 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6146 if (!link_conf) { 6147 dev_kfree_skb(skb); 6148 rcu_read_unlock(); 6149 return -ENOLINK; 6150 } 6151 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6152 rcu_read_unlock(); 6153 } 6154 6155 ehdr->h_proto = proto; 6156 6157 skb->dev = dev; 6158 skb->protocol = proto; 6159 skb_reset_network_header(skb); 6160 skb_reset_mac_header(skb); 6161 6162 if (local->hw.queues < IEEE80211_NUM_ACS) 6163 goto start_xmit; 6164 6165 /* update QoS header to prioritize control port frames if possible, 6166 * priorization also happens for control port frames send over 6167 * AF_PACKET 6168 */ 6169 rcu_read_lock(); 6170 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6171 if (err) { 6172 dev_kfree_skb(skb); 6173 rcu_read_unlock(); 6174 return err; 6175 } 6176 6177 if (!IS_ERR(sta)) { 6178 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6179 6180 skb_set_queue_mapping(skb, queue); 6181 6182 /* 6183 * for MLO STA, the SA should be the AP MLD address, but 6184 * the link ID has been selected already 6185 */ 6186 if (sta && sta->sta.mlo) 6187 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6188 } 6189 rcu_read_unlock(); 6190 6191 start_xmit: 6192 /* mutex lock is only needed for incrementing the cookie counter */ 6193 mutex_lock(&local->mtx); 6194 6195 local_bh_disable(); 6196 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6197 local_bh_enable(); 6198 6199 mutex_unlock(&local->mtx); 6200 6201 return 0; 6202 } 6203 6204 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6205 const u8 *buf, size_t len) 6206 { 6207 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6208 struct ieee80211_local *local = sdata->local; 6209 struct sk_buff *skb; 6210 6211 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6212 30 + /* header size */ 6213 18); /* 11s header size */ 6214 if (!skb) 6215 return -ENOMEM; 6216 6217 skb_reserve(skb, local->hw.extra_tx_headroom); 6218 skb_put_data(skb, buf, len); 6219 6220 skb->dev = dev; 6221 skb->protocol = htons(ETH_P_802_3); 6222 skb_reset_network_header(skb); 6223 skb_reset_mac_header(skb); 6224 6225 local_bh_disable(); 6226 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6227 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6228 NULL); 6229 local_bh_enable(); 6230 6231 return 0; 6232 } 6233