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 #include <net/gso.h> 30 31 #include "ieee80211_i.h" 32 #include "driver-ops.h" 33 #include "led.h" 34 #include "mesh.h" 35 #include "wep.h" 36 #include "wpa.h" 37 #include "wme.h" 38 #include "rate.h" 39 40 /* misc utils */ 41 42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 43 struct sk_buff *skb, int group_addr, 44 int next_frag_len) 45 { 46 int rate, mrate, erp, dur, i; 47 struct ieee80211_rate *txrate; 48 struct ieee80211_local *local = tx->local; 49 struct ieee80211_supported_band *sband; 50 struct ieee80211_hdr *hdr; 51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 52 struct ieee80211_chanctx_conf *chanctx_conf; 53 u32 rate_flags = 0; 54 55 /* assume HW handles this */ 56 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 57 return 0; 58 59 rcu_read_lock(); 60 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 61 if (chanctx_conf) 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 rcu_read_unlock(); 64 65 /* uh huh? */ 66 if (WARN_ON_ONCE(tx->rate.idx < 0)) 67 return 0; 68 69 sband = local->hw.wiphy->bands[info->band]; 70 txrate = &sband->bitrates[tx->rate.idx]; 71 72 erp = txrate->flags & IEEE80211_RATE_ERP_G; 73 74 /* device is expected to do this */ 75 if (sband->band == NL80211_BAND_S1GHZ) 76 return 0; 77 78 /* 79 * data and mgmt (except PS Poll): 80 * - during CFP: 32768 81 * - during contention period: 82 * if addr1 is group address: 0 83 * if more fragments = 0 and addr1 is individual address: time to 84 * transmit one ACK plus SIFS 85 * if more fragments = 1 and addr1 is individual address: time to 86 * transmit next fragment plus 2 x ACK plus 3 x SIFS 87 * 88 * IEEE 802.11, 9.6: 89 * - control response frame (CTS or ACK) shall be transmitted using the 90 * same rate as the immediately previous frame in the frame exchange 91 * sequence, if this rate belongs to the PHY mandatory rates, or else 92 * at the highest possible rate belonging to the PHY rates in the 93 * BSSBasicRateSet 94 */ 95 hdr = (struct ieee80211_hdr *)skb->data; 96 if (ieee80211_is_ctl(hdr->frame_control)) { 97 /* TODO: These control frames are not currently sent by 98 * mac80211, but should they be implemented, this function 99 * needs to be updated to support duration field calculation. 100 * 101 * RTS: time needed to transmit pending data/mgmt frame plus 102 * one CTS frame plus one ACK frame plus 3 x SIFS 103 * CTS: duration of immediately previous RTS minus time 104 * required to transmit CTS and its SIFS 105 * ACK: 0 if immediately previous directed data/mgmt had 106 * more=0, with more=1 duration in ACK frame is duration 107 * from previous frame minus time needed to transmit ACK 108 * and its SIFS 109 * PS Poll: BIT(15) | BIT(14) | aid 110 */ 111 return 0; 112 } 113 114 /* data/mgmt */ 115 if (0 /* FIX: data/mgmt during CFP */) 116 return cpu_to_le16(32768); 117 118 if (group_addr) /* Group address as the destination - no ACK */ 119 return 0; 120 121 /* Individual destination address: 122 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 123 * CTS and ACK frames shall be transmitted using the highest rate in 124 * basic rate set that is less than or equal to the rate of the 125 * immediately previous frame and that is using the same modulation 126 * (CCK or OFDM). If no basic rate set matches with these requirements, 127 * the highest mandatory rate of the PHY that is less than or equal to 128 * the rate of the previous frame is used. 129 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 130 */ 131 rate = -1; 132 /* use lowest available if everything fails */ 133 mrate = sband->bitrates[0].bitrate; 134 for (i = 0; i < sband->n_bitrates; i++) { 135 struct ieee80211_rate *r = &sband->bitrates[i]; 136 137 if (r->bitrate > txrate->bitrate) 138 break; 139 140 if ((rate_flags & r->flags) != rate_flags) 141 continue; 142 143 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 144 rate = r->bitrate; 145 146 switch (sband->band) { 147 case NL80211_BAND_2GHZ: 148 case NL80211_BAND_LC: { 149 u32 flag; 150 if (tx->sdata->deflink.operating_11g_mode) 151 flag = IEEE80211_RATE_MANDATORY_G; 152 else 153 flag = IEEE80211_RATE_MANDATORY_B; 154 if (r->flags & flag) 155 mrate = r->bitrate; 156 break; 157 } 158 case NL80211_BAND_5GHZ: 159 case NL80211_BAND_6GHZ: 160 if (r->flags & IEEE80211_RATE_MANDATORY_A) 161 mrate = r->bitrate; 162 break; 163 case NL80211_BAND_S1GHZ: 164 case NL80211_BAND_60GHZ: 165 /* TODO, for now fall through */ 166 case NUM_NL80211_BANDS: 167 WARN_ON(1); 168 break; 169 } 170 } 171 if (rate == -1) { 172 /* No matching basic rate found; use highest suitable mandatory 173 * PHY rate */ 174 rate = mrate; 175 } 176 177 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 178 if (ieee80211_is_data_qos(hdr->frame_control) && 179 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 180 dur = 0; 181 else 182 /* Time needed to transmit ACK 183 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 184 * to closest integer */ 185 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 186 tx->sdata->vif.bss_conf.use_short_preamble); 187 188 if (next_frag_len) { 189 /* Frame is fragmented: duration increases with time needed to 190 * transmit next fragment plus ACK and 2 x SIFS. */ 191 dur *= 2; /* ACK + SIFS */ 192 /* next fragment */ 193 dur += ieee80211_frame_duration(sband->band, next_frag_len, 194 txrate->bitrate, erp, 195 tx->sdata->vif.bss_conf.use_short_preamble); 196 } 197 198 return cpu_to_le16(dur); 199 } 200 201 /* tx handlers */ 202 static ieee80211_tx_result debug_noinline 203 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 204 { 205 struct ieee80211_local *local = tx->local; 206 struct ieee80211_if_managed *ifmgd; 207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 208 209 /* driver doesn't support power save */ 210 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 211 return TX_CONTINUE; 212 213 /* hardware does dynamic power save */ 214 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 215 return TX_CONTINUE; 216 217 /* dynamic power save disabled */ 218 if (local->hw.conf.dynamic_ps_timeout <= 0) 219 return TX_CONTINUE; 220 221 /* we are scanning, don't enable power save */ 222 if (local->scanning) 223 return TX_CONTINUE; 224 225 if (!local->ps_sdata) 226 return TX_CONTINUE; 227 228 /* No point if we're going to suspend */ 229 if (local->quiescing) 230 return TX_CONTINUE; 231 232 /* dynamic ps is supported only in managed mode */ 233 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 234 return TX_CONTINUE; 235 236 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 237 return TX_CONTINUE; 238 239 ifmgd = &tx->sdata->u.mgd; 240 241 /* 242 * Don't wakeup from power save if u-apsd is enabled, voip ac has 243 * u-apsd enabled and the frame is in voip class. This effectively 244 * means that even if all access categories have u-apsd enabled, in 245 * practise u-apsd is only used with the voip ac. This is a 246 * workaround for the case when received voip class packets do not 247 * have correct qos tag for some reason, due the network or the 248 * peer application. 249 * 250 * Note: ifmgd->uapsd_queues access is racy here. If the value is 251 * changed via debugfs, user needs to reassociate manually to have 252 * everything in sync. 253 */ 254 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 255 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 256 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 257 return TX_CONTINUE; 258 259 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 260 ieee80211_stop_queues_by_reason(&local->hw, 261 IEEE80211_MAX_QUEUE_MAP, 262 IEEE80211_QUEUE_STOP_REASON_PS, 263 false); 264 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 265 wiphy_work_queue(local->hw.wiphy, 266 &local->dynamic_ps_disable_work); 267 } 268 269 /* Don't restart the timer if we're not disassociated */ 270 if (!ifmgd->associated) 271 return TX_CONTINUE; 272 273 mod_timer(&local->dynamic_ps_timer, jiffies + 274 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 275 276 return TX_CONTINUE; 277 } 278 279 static ieee80211_tx_result debug_noinline 280 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 281 { 282 283 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 285 bool assoc = false; 286 287 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 288 return TX_CONTINUE; 289 290 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 291 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 292 !ieee80211_is_probe_req(hdr->frame_control) && 293 !ieee80211_is_any_nullfunc(hdr->frame_control)) 294 /* 295 * When software scanning only nullfunc frames (to notify 296 * the sleep state to the AP) and probe requests (for the 297 * active scan) are allowed, all other frames should not be 298 * sent and we should not get here, but if we do 299 * nonetheless, drop them to avoid sending them 300 * off-channel. See the link below and 301 * ieee80211_start_scan() for more. 302 * 303 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 304 */ 305 return TX_DROP; 306 307 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 308 return TX_CONTINUE; 309 310 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 311 return TX_CONTINUE; 312 313 if (tx->sta) 314 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 315 316 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 317 if (unlikely(!assoc && 318 ieee80211_is_data(hdr->frame_control))) { 319 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 320 sdata_info(tx->sdata, 321 "dropped data frame to not associated station %pM\n", 322 hdr->addr1); 323 #endif 324 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 325 return TX_DROP; 326 } 327 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 328 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 329 /* 330 * No associated STAs - no need to send multicast 331 * frames. 332 */ 333 return TX_DROP; 334 } 335 336 return TX_CONTINUE; 337 } 338 339 /* This function is called whenever the AP is about to exceed the maximum limit 340 * of buffered frames for power saving STAs. This situation should not really 341 * happen often during normal operation, so dropping the oldest buffered packet 342 * from each queue should be OK to make some room for new frames. */ 343 static void purge_old_ps_buffers(struct ieee80211_local *local) 344 { 345 int total = 0, purged = 0; 346 struct sk_buff *skb; 347 struct ieee80211_sub_if_data *sdata; 348 struct sta_info *sta; 349 350 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 351 struct ps_data *ps; 352 353 if (sdata->vif.type == NL80211_IFTYPE_AP) 354 ps = &sdata->u.ap.ps; 355 else if (ieee80211_vif_is_mesh(&sdata->vif)) 356 ps = &sdata->u.mesh.ps; 357 else 358 continue; 359 360 skb = skb_dequeue(&ps->bc_buf); 361 if (skb) { 362 purged++; 363 ieee80211_free_txskb(&local->hw, skb); 364 } 365 total += skb_queue_len(&ps->bc_buf); 366 } 367 368 /* 369 * Drop one frame from each station from the lowest-priority 370 * AC that has frames at all. 371 */ 372 list_for_each_entry_rcu(sta, &local->sta_list, list) { 373 int ac; 374 375 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 376 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 377 total += skb_queue_len(&sta->ps_tx_buf[ac]); 378 if (skb) { 379 purged++; 380 ieee80211_free_txskb(&local->hw, skb); 381 break; 382 } 383 } 384 } 385 386 local->total_ps_buffered = total; 387 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 388 } 389 390 static ieee80211_tx_result 391 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 392 { 393 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 394 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 395 struct ps_data *ps; 396 397 /* 398 * broadcast/multicast frame 399 * 400 * If any of the associated/peer stations is in power save mode, 401 * the frame is buffered to be sent after DTIM beacon frame. 402 * This is done either by the hardware or us. 403 */ 404 405 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 406 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 407 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 408 if (!tx->sdata->bss) 409 return TX_CONTINUE; 410 411 ps = &tx->sdata->bss->ps; 412 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 413 ps = &tx->sdata->u.mesh.ps; 414 } else { 415 return TX_CONTINUE; 416 } 417 418 419 /* no buffering for ordered frames */ 420 if (ieee80211_has_order(hdr->frame_control)) 421 return TX_CONTINUE; 422 423 if (ieee80211_is_probe_req(hdr->frame_control)) 424 return TX_CONTINUE; 425 426 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 427 info->hw_queue = tx->sdata->vif.cab_queue; 428 429 /* no stations in PS mode and no buffered packets */ 430 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 431 return TX_CONTINUE; 432 433 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 434 435 /* device releases frame after DTIM beacon */ 436 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 437 return TX_CONTINUE; 438 439 /* buffered in mac80211 */ 440 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 441 purge_old_ps_buffers(tx->local); 442 443 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 444 ps_dbg(tx->sdata, 445 "BC TX buffer full - dropping the oldest frame\n"); 446 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 447 } else 448 tx->local->total_ps_buffered++; 449 450 skb_queue_tail(&ps->bc_buf, tx->skb); 451 452 return TX_QUEUED; 453 } 454 455 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 456 struct sk_buff *skb) 457 { 458 if (!ieee80211_is_mgmt(fc)) 459 return 0; 460 461 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 462 return 0; 463 464 if (!ieee80211_is_robust_mgmt_frame(skb)) 465 return 0; 466 467 return 1; 468 } 469 470 static ieee80211_tx_result 471 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 472 { 473 struct sta_info *sta = tx->sta; 474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 475 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 476 struct ieee80211_local *local = tx->local; 477 478 if (unlikely(!sta)) 479 return TX_CONTINUE; 480 481 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 482 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 483 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 484 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 485 int ac = skb_get_queue_mapping(tx->skb); 486 487 if (ieee80211_is_mgmt(hdr->frame_control) && 488 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 489 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 490 return TX_CONTINUE; 491 } 492 493 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 494 sta->sta.addr, sta->sta.aid, ac); 495 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 496 purge_old_ps_buffers(tx->local); 497 498 /* sync with ieee80211_sta_ps_deliver_wakeup */ 499 spin_lock(&sta->ps_lock); 500 /* 501 * STA woke up the meantime and all the frames on ps_tx_buf have 502 * been queued to pending queue. No reordering can happen, go 503 * ahead and Tx the packet. 504 */ 505 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 506 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 507 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 508 spin_unlock(&sta->ps_lock); 509 return TX_CONTINUE; 510 } 511 512 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 513 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 514 ps_dbg(tx->sdata, 515 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 516 sta->sta.addr, ac); 517 ieee80211_free_txskb(&local->hw, old); 518 } else 519 tx->local->total_ps_buffered++; 520 521 info->control.jiffies = jiffies; 522 info->control.vif = &tx->sdata->vif; 523 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 524 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 525 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 526 spin_unlock(&sta->ps_lock); 527 528 if (!timer_pending(&local->sta_cleanup)) 529 mod_timer(&local->sta_cleanup, 530 round_jiffies(jiffies + 531 STA_INFO_CLEANUP_INTERVAL)); 532 533 /* 534 * We queued up some frames, so the TIM bit might 535 * need to be set, recalculate it. 536 */ 537 sta_info_recalc_tim(sta); 538 539 return TX_QUEUED; 540 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 541 ps_dbg(tx->sdata, 542 "STA %pM in PS mode, but polling/in SP -> send frame\n", 543 sta->sta.addr); 544 } 545 546 return TX_CONTINUE; 547 } 548 549 static ieee80211_tx_result debug_noinline 550 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 551 { 552 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 553 return TX_CONTINUE; 554 555 if (tx->flags & IEEE80211_TX_UNICAST) 556 return ieee80211_tx_h_unicast_ps_buf(tx); 557 else 558 return ieee80211_tx_h_multicast_ps_buf(tx); 559 } 560 561 static ieee80211_tx_result debug_noinline 562 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 563 { 564 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 565 566 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 567 if (tx->sdata->control_port_no_encrypt) 568 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 569 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 570 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 571 } 572 573 return TX_CONTINUE; 574 } 575 576 static struct ieee80211_key * 577 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 578 { 579 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 580 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 581 struct ieee80211_link_data *link; 582 unsigned int link_id; 583 584 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 585 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 586 link = &tx->sdata->deflink; 587 } else { 588 link = rcu_dereference(tx->sdata->link[link_id]); 589 if (!link) 590 return NULL; 591 } 592 593 if (ieee80211_is_group_privacy_action(tx->skb)) 594 return rcu_dereference(link->default_multicast_key); 595 else if (ieee80211_is_mgmt(hdr->frame_control) && 596 is_multicast_ether_addr(hdr->addr1) && 597 ieee80211_is_robust_mgmt_frame(tx->skb)) 598 return rcu_dereference(link->default_mgmt_key); 599 else if (is_multicast_ether_addr(hdr->addr1)) 600 return rcu_dereference(link->default_multicast_key); 601 602 return NULL; 603 } 604 605 static ieee80211_tx_result debug_noinline 606 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 607 { 608 struct ieee80211_key *key; 609 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 610 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 611 612 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 613 tx->key = NULL; 614 return TX_CONTINUE; 615 } 616 617 if (tx->sta && 618 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 619 tx->key = key; 620 else if ((key = ieee80211_select_link_key(tx))) 621 tx->key = key; 622 else if (!is_multicast_ether_addr(hdr->addr1) && 623 (key = rcu_dereference(tx->sdata->default_unicast_key))) 624 tx->key = key; 625 else 626 tx->key = NULL; 627 628 if (tx->key) { 629 bool skip_hw = false; 630 631 /* TODO: add threshold stuff again */ 632 633 switch (tx->key->conf.cipher) { 634 case WLAN_CIPHER_SUITE_WEP40: 635 case WLAN_CIPHER_SUITE_WEP104: 636 case WLAN_CIPHER_SUITE_TKIP: 637 if (!ieee80211_is_data_present(hdr->frame_control)) 638 tx->key = NULL; 639 break; 640 case WLAN_CIPHER_SUITE_CCMP: 641 case WLAN_CIPHER_SUITE_CCMP_256: 642 case WLAN_CIPHER_SUITE_GCMP: 643 case WLAN_CIPHER_SUITE_GCMP_256: 644 if (!ieee80211_is_data_present(hdr->frame_control) && 645 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 646 tx->skb) && 647 !ieee80211_is_group_privacy_action(tx->skb)) 648 tx->key = NULL; 649 else 650 skip_hw = (tx->key->conf.flags & 651 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 652 ieee80211_is_mgmt(hdr->frame_control); 653 break; 654 case WLAN_CIPHER_SUITE_AES_CMAC: 655 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 656 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 657 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 658 if (!ieee80211_is_mgmt(hdr->frame_control)) 659 tx->key = NULL; 660 break; 661 } 662 663 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 664 !ieee80211_is_deauth(hdr->frame_control)) && 665 tx->skb->protocol != tx->sdata->control_port_protocol) 666 return TX_DROP; 667 668 if (!skip_hw && tx->key && 669 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 670 info->control.hw_key = &tx->key->conf; 671 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 672 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 673 return TX_DROP; 674 } 675 676 return TX_CONTINUE; 677 } 678 679 static ieee80211_tx_result debug_noinline 680 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 681 { 682 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 683 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 684 struct ieee80211_supported_band *sband; 685 u32 len; 686 struct ieee80211_tx_rate_control txrc; 687 struct ieee80211_sta_rates *ratetbl = NULL; 688 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 689 bool assoc = false; 690 691 memset(&txrc, 0, sizeof(txrc)); 692 693 sband = tx->local->hw.wiphy->bands[info->band]; 694 695 len = min_t(u32, tx->skb->len + FCS_LEN, 696 tx->local->hw.wiphy->frag_threshold); 697 698 /* set up the tx rate control struct we give the RC algo */ 699 txrc.hw = &tx->local->hw; 700 txrc.sband = sband; 701 txrc.bss_conf = &tx->sdata->vif.bss_conf; 702 txrc.skb = tx->skb; 703 txrc.reported_rate.idx = -1; 704 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 705 706 if (tx->sdata->rc_has_mcs_mask[info->band]) 707 txrc.rate_idx_mcs_mask = 708 tx->sdata->rc_rateidx_mcs_mask[info->band]; 709 710 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 711 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 712 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 713 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 714 715 /* set up RTS protection if desired */ 716 if (len > tx->local->hw.wiphy->rts_threshold) { 717 txrc.rts = true; 718 } 719 720 info->control.use_rts = txrc.rts; 721 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 722 723 /* 724 * Use short preamble if the BSS can handle it, but not for 725 * management frames unless we know the receiver can handle 726 * that -- the management frame might be to a station that 727 * just wants a probe response. 728 */ 729 if (tx->sdata->vif.bss_conf.use_short_preamble && 730 (ieee80211_is_tx_data(tx->skb) || 731 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 732 txrc.short_preamble = true; 733 734 info->control.short_preamble = txrc.short_preamble; 735 736 /* don't ask rate control when rate already injected via radiotap */ 737 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 738 return TX_CONTINUE; 739 740 if (tx->sta) 741 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 742 743 /* 744 * Lets not bother rate control if we're associated and cannot 745 * talk to the sta. This should not happen. 746 */ 747 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 748 !rate_usable_index_exists(sband, &tx->sta->sta), 749 "%s: Dropped data frame as no usable bitrate found while " 750 "scanning and associated. Target station: " 751 "%pM on %d GHz band\n", 752 tx->sdata->name, 753 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 754 info->band ? 5 : 2)) 755 return TX_DROP; 756 757 /* 758 * If we're associated with the sta at this point we know we can at 759 * least send the frame at the lowest bit rate. 760 */ 761 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 762 763 if (tx->sta && !info->control.skip_table) 764 ratetbl = rcu_dereference(tx->sta->sta.rates); 765 766 if (unlikely(info->control.rates[0].idx < 0)) { 767 if (ratetbl) { 768 struct ieee80211_tx_rate rate = { 769 .idx = ratetbl->rate[0].idx, 770 .flags = ratetbl->rate[0].flags, 771 .count = ratetbl->rate[0].count 772 }; 773 774 if (ratetbl->rate[0].idx < 0) 775 return TX_DROP; 776 777 tx->rate = rate; 778 } else { 779 return TX_DROP; 780 } 781 } else { 782 tx->rate = info->control.rates[0]; 783 } 784 785 if (txrc.reported_rate.idx < 0) { 786 txrc.reported_rate = tx->rate; 787 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 788 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 789 } else if (tx->sta) 790 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 791 792 if (ratetbl) 793 return TX_CONTINUE; 794 795 if (unlikely(!info->control.rates[0].count)) 796 info->control.rates[0].count = 1; 797 798 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 799 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 800 info->control.rates[0].count = 1; 801 802 return TX_CONTINUE; 803 } 804 805 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 806 { 807 u16 *seq = &sta->tid_seq[tid]; 808 __le16 ret = cpu_to_le16(*seq); 809 810 /* Increase the sequence number. */ 811 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 812 813 return ret; 814 } 815 816 static ieee80211_tx_result debug_noinline 817 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 818 { 819 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 820 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 821 int tid; 822 823 /* 824 * Packet injection may want to control the sequence 825 * number, if we have no matching interface then we 826 * neither assign one ourselves nor ask the driver to. 827 */ 828 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 829 return TX_CONTINUE; 830 831 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 832 return TX_CONTINUE; 833 834 if (ieee80211_hdrlen(hdr->frame_control) < 24) 835 return TX_CONTINUE; 836 837 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 838 return TX_CONTINUE; 839 840 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 841 return TX_CONTINUE; 842 843 /* SNS11 from 802.11be 10.3.2.14 */ 844 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 845 ieee80211_vif_is_mld(info->control.vif) && 846 info->control.vif->type == NL80211_IFTYPE_AP)) { 847 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 848 tx->sdata->mld_mcast_seq += 0x10; 849 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 850 return TX_CONTINUE; 851 } 852 853 /* 854 * Anything but QoS data that has a sequence number field 855 * (is long enough) gets a sequence number from the global 856 * counter. QoS data frames with a multicast destination 857 * also use the global counter (802.11-2012 9.3.2.10). 858 */ 859 if (!ieee80211_is_data_qos(hdr->frame_control) || 860 is_multicast_ether_addr(hdr->addr1)) { 861 /* driver should assign sequence number */ 862 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 863 /* for pure STA mode without beacons, we can do it */ 864 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 865 tx->sdata->sequence_number += 0x10; 866 if (tx->sta) 867 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 868 return TX_CONTINUE; 869 } 870 871 /* 872 * This should be true for injected/management frames only, for 873 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 874 * above since they are not QoS-data frames. 875 */ 876 if (!tx->sta) 877 return TX_CONTINUE; 878 879 /* include per-STA, per-TID sequence counter */ 880 tid = ieee80211_get_tid(hdr); 881 tx->sta->deflink.tx_stats.msdu[tid]++; 882 883 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 884 885 return TX_CONTINUE; 886 } 887 888 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 889 struct sk_buff *skb, int hdrlen, 890 int frag_threshold) 891 { 892 struct ieee80211_local *local = tx->local; 893 struct ieee80211_tx_info *info; 894 struct sk_buff *tmp; 895 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 896 int pos = hdrlen + per_fragm; 897 int rem = skb->len - hdrlen - per_fragm; 898 899 if (WARN_ON(rem < 0)) 900 return -EINVAL; 901 902 /* first fragment was already added to queue by caller */ 903 904 while (rem) { 905 int fraglen = per_fragm; 906 907 if (fraglen > rem) 908 fraglen = rem; 909 rem -= fraglen; 910 tmp = dev_alloc_skb(local->tx_headroom + 911 frag_threshold + 912 IEEE80211_ENCRYPT_HEADROOM + 913 IEEE80211_ENCRYPT_TAILROOM); 914 if (!tmp) 915 return -ENOMEM; 916 917 __skb_queue_tail(&tx->skbs, tmp); 918 919 skb_reserve(tmp, 920 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 921 922 /* copy control information */ 923 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 924 925 info = IEEE80211_SKB_CB(tmp); 926 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 927 IEEE80211_TX_CTL_FIRST_FRAGMENT); 928 929 if (rem) 930 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 931 932 skb_copy_queue_mapping(tmp, skb); 933 tmp->priority = skb->priority; 934 tmp->dev = skb->dev; 935 936 /* copy header and data */ 937 skb_put_data(tmp, skb->data, hdrlen); 938 skb_put_data(tmp, skb->data + pos, fraglen); 939 940 pos += fraglen; 941 } 942 943 /* adjust first fragment's length */ 944 skb_trim(skb, hdrlen + per_fragm); 945 return 0; 946 } 947 948 static ieee80211_tx_result debug_noinline 949 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 950 { 951 struct sk_buff *skb = tx->skb; 952 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 953 struct ieee80211_hdr *hdr = (void *)skb->data; 954 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 955 int hdrlen; 956 int fragnum; 957 958 /* no matter what happens, tx->skb moves to tx->skbs */ 959 __skb_queue_tail(&tx->skbs, skb); 960 tx->skb = NULL; 961 962 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 963 return TX_CONTINUE; 964 965 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 966 return TX_CONTINUE; 967 968 /* 969 * Warn when submitting a fragmented A-MPDU frame and drop it. 970 * This scenario is handled in ieee80211_tx_prepare but extra 971 * caution taken here as fragmented ampdu may cause Tx stop. 972 */ 973 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 974 return TX_DROP; 975 976 hdrlen = ieee80211_hdrlen(hdr->frame_control); 977 978 /* internal error, why isn't DONTFRAG set? */ 979 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 980 return TX_DROP; 981 982 /* 983 * Now fragment the frame. This will allocate all the fragments and 984 * chain them (using skb as the first fragment) to skb->next. 985 * During transmission, we will remove the successfully transmitted 986 * fragments from this list. When the low-level driver rejects one 987 * of the fragments then we will simply pretend to accept the skb 988 * but store it away as pending. 989 */ 990 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 991 return TX_DROP; 992 993 /* update duration/seq/flags of fragments */ 994 fragnum = 0; 995 996 skb_queue_walk(&tx->skbs, skb) { 997 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 998 999 hdr = (void *)skb->data; 1000 info = IEEE80211_SKB_CB(skb); 1001 1002 if (!skb_queue_is_last(&tx->skbs, skb)) { 1003 hdr->frame_control |= morefrags; 1004 /* 1005 * No multi-rate retries for fragmented frames, that 1006 * would completely throw off the NAV at other STAs. 1007 */ 1008 info->control.rates[1].idx = -1; 1009 info->control.rates[2].idx = -1; 1010 info->control.rates[3].idx = -1; 1011 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1012 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1013 } else { 1014 hdr->frame_control &= ~morefrags; 1015 } 1016 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1017 fragnum++; 1018 } 1019 1020 return TX_CONTINUE; 1021 } 1022 1023 static ieee80211_tx_result debug_noinline 1024 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1025 { 1026 struct sk_buff *skb; 1027 int ac = -1; 1028 1029 if (!tx->sta) 1030 return TX_CONTINUE; 1031 1032 skb_queue_walk(&tx->skbs, skb) { 1033 ac = skb_get_queue_mapping(skb); 1034 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1035 } 1036 if (ac >= 0) 1037 tx->sta->deflink.tx_stats.packets[ac]++; 1038 1039 return TX_CONTINUE; 1040 } 1041 1042 static ieee80211_tx_result debug_noinline 1043 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1044 { 1045 if (!tx->key) 1046 return TX_CONTINUE; 1047 1048 switch (tx->key->conf.cipher) { 1049 case WLAN_CIPHER_SUITE_WEP40: 1050 case WLAN_CIPHER_SUITE_WEP104: 1051 return ieee80211_crypto_wep_encrypt(tx); 1052 case WLAN_CIPHER_SUITE_TKIP: 1053 return ieee80211_crypto_tkip_encrypt(tx); 1054 case WLAN_CIPHER_SUITE_CCMP: 1055 return ieee80211_crypto_ccmp_encrypt( 1056 tx, IEEE80211_CCMP_MIC_LEN); 1057 case WLAN_CIPHER_SUITE_CCMP_256: 1058 return ieee80211_crypto_ccmp_encrypt( 1059 tx, IEEE80211_CCMP_256_MIC_LEN); 1060 case WLAN_CIPHER_SUITE_AES_CMAC: 1061 return ieee80211_crypto_aes_cmac_encrypt(tx); 1062 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1063 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1064 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1065 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1066 return ieee80211_crypto_aes_gmac_encrypt(tx); 1067 case WLAN_CIPHER_SUITE_GCMP: 1068 case WLAN_CIPHER_SUITE_GCMP_256: 1069 return ieee80211_crypto_gcmp_encrypt(tx); 1070 } 1071 1072 return TX_DROP; 1073 } 1074 1075 static ieee80211_tx_result debug_noinline 1076 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1077 { 1078 struct sk_buff *skb; 1079 struct ieee80211_hdr *hdr; 1080 int next_len; 1081 bool group_addr; 1082 1083 skb_queue_walk(&tx->skbs, skb) { 1084 hdr = (void *) skb->data; 1085 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1086 break; /* must not overwrite AID */ 1087 if (!skb_queue_is_last(&tx->skbs, skb)) { 1088 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1089 next_len = next->len; 1090 } else 1091 next_len = 0; 1092 group_addr = is_multicast_ether_addr(hdr->addr1); 1093 1094 hdr->duration_id = 1095 ieee80211_duration(tx, skb, group_addr, next_len); 1096 } 1097 1098 return TX_CONTINUE; 1099 } 1100 1101 /* actual transmit path */ 1102 1103 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1104 struct sk_buff *skb, 1105 struct ieee80211_tx_info *info, 1106 struct tid_ampdu_tx *tid_tx, 1107 int tid) 1108 { 1109 bool queued = false; 1110 bool reset_agg_timer = false; 1111 struct sk_buff *purge_skb = NULL; 1112 1113 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1114 reset_agg_timer = true; 1115 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1116 /* 1117 * nothing -- this aggregation session is being started 1118 * but that might still fail with the driver 1119 */ 1120 } else if (!tx->sta->sta.txq[tid]) { 1121 spin_lock(&tx->sta->lock); 1122 /* 1123 * Need to re-check now, because we may get here 1124 * 1125 * 1) in the window during which the setup is actually 1126 * already done, but not marked yet because not all 1127 * packets are spliced over to the driver pending 1128 * queue yet -- if this happened we acquire the lock 1129 * either before or after the splice happens, but 1130 * need to recheck which of these cases happened. 1131 * 1132 * 2) during session teardown, if the OPERATIONAL bit 1133 * was cleared due to the teardown but the pointer 1134 * hasn't been assigned NULL yet (or we loaded it 1135 * before it was assigned) -- in this case it may 1136 * now be NULL which means we should just let the 1137 * packet pass through because splicing the frames 1138 * back is already done. 1139 */ 1140 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1141 1142 if (!tid_tx) { 1143 /* do nothing, let packet pass through */ 1144 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1145 reset_agg_timer = true; 1146 } else { 1147 queued = true; 1148 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1149 clear_sta_flag(tx->sta, WLAN_STA_SP); 1150 ps_dbg(tx->sta->sdata, 1151 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1152 tx->sta->sta.addr, tx->sta->sta.aid); 1153 } 1154 info->control.vif = &tx->sdata->vif; 1155 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1156 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1157 __skb_queue_tail(&tid_tx->pending, skb); 1158 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1159 purge_skb = __skb_dequeue(&tid_tx->pending); 1160 } 1161 spin_unlock(&tx->sta->lock); 1162 1163 if (purge_skb) 1164 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1165 } 1166 1167 /* reset session timer */ 1168 if (reset_agg_timer) 1169 tid_tx->last_tx = jiffies; 1170 1171 return queued; 1172 } 1173 1174 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1175 struct sta_info *sta, struct sk_buff *skb) 1176 { 1177 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1178 u16 tid; 1179 1180 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1181 return; 1182 1183 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1184 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1185 skb->protocol == sdata->control_port_protocol) 1186 return; 1187 1188 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1189 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1190 return; 1191 1192 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1193 } 1194 1195 /* 1196 * initialises @tx 1197 * pass %NULL for the station if unknown, a valid pointer if known 1198 * or an ERR_PTR() if the station is known not to exist 1199 */ 1200 static ieee80211_tx_result 1201 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1202 struct ieee80211_tx_data *tx, 1203 struct sta_info *sta, struct sk_buff *skb) 1204 { 1205 struct ieee80211_local *local = sdata->local; 1206 struct ieee80211_hdr *hdr; 1207 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1208 bool aggr_check = false; 1209 int tid; 1210 1211 memset(tx, 0, sizeof(*tx)); 1212 tx->skb = skb; 1213 tx->local = local; 1214 tx->sdata = sdata; 1215 __skb_queue_head_init(&tx->skbs); 1216 1217 /* 1218 * If this flag is set to true anywhere, and we get here, 1219 * we are doing the needed processing, so remove the flag 1220 * now. 1221 */ 1222 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1223 1224 hdr = (struct ieee80211_hdr *) skb->data; 1225 1226 if (likely(sta)) { 1227 if (!IS_ERR(sta)) 1228 tx->sta = sta; 1229 } else { 1230 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1231 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1232 if (!tx->sta && sdata->wdev.use_4addr) 1233 return TX_DROP; 1234 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1235 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1236 } 1237 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1238 tx->sta = sta_info_get(sdata, hdr->addr1); 1239 aggr_check = true; 1240 } 1241 } 1242 1243 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1244 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1245 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1246 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1247 struct tid_ampdu_tx *tid_tx; 1248 1249 tid = ieee80211_get_tid(hdr); 1250 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1251 if (!tid_tx && aggr_check) { 1252 ieee80211_aggr_check(sdata, tx->sta, skb); 1253 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1254 } 1255 1256 if (tid_tx) { 1257 bool queued; 1258 1259 queued = ieee80211_tx_prep_agg(tx, skb, info, 1260 tid_tx, tid); 1261 1262 if (unlikely(queued)) 1263 return TX_QUEUED; 1264 } 1265 } 1266 1267 if (is_multicast_ether_addr(hdr->addr1)) { 1268 tx->flags &= ~IEEE80211_TX_UNICAST; 1269 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1270 } else 1271 tx->flags |= IEEE80211_TX_UNICAST; 1272 1273 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1274 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1275 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1276 info->flags & IEEE80211_TX_CTL_AMPDU) 1277 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1278 } 1279 1280 if (!tx->sta) 1281 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1282 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1283 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1284 ieee80211_check_fast_xmit(tx->sta); 1285 } 1286 1287 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1288 1289 return TX_CONTINUE; 1290 } 1291 1292 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1293 struct ieee80211_vif *vif, 1294 struct sta_info *sta, 1295 struct sk_buff *skb) 1296 { 1297 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1298 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1299 struct ieee80211_txq *txq = NULL; 1300 1301 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1302 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1303 return NULL; 1304 1305 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1306 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1307 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1308 ieee80211_is_bufferable_mmpdu(skb) || 1309 vif->type == NL80211_IFTYPE_STATION) && 1310 sta && sta->uploaded) { 1311 /* 1312 * This will be NULL if the driver didn't set the 1313 * opt-in hardware flag. 1314 */ 1315 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1316 } 1317 } else if (sta) { 1318 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1319 1320 if (!sta->uploaded) 1321 return NULL; 1322 1323 txq = sta->sta.txq[tid]; 1324 } else { 1325 txq = vif->txq; 1326 } 1327 1328 if (!txq) 1329 return NULL; 1330 1331 return to_txq_info(txq); 1332 } 1333 1334 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1335 { 1336 struct sk_buff *next; 1337 codel_time_t now = codel_get_time(); 1338 1339 skb_list_walk_safe(skb, skb, next) 1340 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1341 } 1342 1343 static u32 codel_skb_len_func(const struct sk_buff *skb) 1344 { 1345 return skb->len; 1346 } 1347 1348 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1349 { 1350 const struct ieee80211_tx_info *info; 1351 1352 info = (const struct ieee80211_tx_info *)skb->cb; 1353 return info->control.enqueue_time; 1354 } 1355 1356 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1357 void *ctx) 1358 { 1359 struct ieee80211_local *local; 1360 struct txq_info *txqi; 1361 struct fq *fq; 1362 struct fq_flow *flow; 1363 1364 txqi = ctx; 1365 local = vif_to_sdata(txqi->txq.vif)->local; 1366 fq = &local->fq; 1367 1368 if (cvars == &txqi->def_cvars) 1369 flow = &txqi->tin.default_flow; 1370 else 1371 flow = &fq->flows[cvars - local->cvars]; 1372 1373 return fq_flow_dequeue(fq, flow); 1374 } 1375 1376 static void codel_drop_func(struct sk_buff *skb, 1377 void *ctx) 1378 { 1379 struct ieee80211_local *local; 1380 struct ieee80211_hw *hw; 1381 struct txq_info *txqi; 1382 1383 txqi = ctx; 1384 local = vif_to_sdata(txqi->txq.vif)->local; 1385 hw = &local->hw; 1386 1387 ieee80211_free_txskb(hw, skb); 1388 } 1389 1390 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1391 struct fq_tin *tin, 1392 struct fq_flow *flow) 1393 { 1394 struct ieee80211_local *local; 1395 struct txq_info *txqi; 1396 struct codel_vars *cvars; 1397 struct codel_params *cparams; 1398 struct codel_stats *cstats; 1399 1400 local = container_of(fq, struct ieee80211_local, fq); 1401 txqi = container_of(tin, struct txq_info, tin); 1402 cstats = &txqi->cstats; 1403 1404 if (txqi->txq.sta) { 1405 struct sta_info *sta = container_of(txqi->txq.sta, 1406 struct sta_info, sta); 1407 cparams = &sta->cparams; 1408 } else { 1409 cparams = &local->cparams; 1410 } 1411 1412 if (flow == &tin->default_flow) 1413 cvars = &txqi->def_cvars; 1414 else 1415 cvars = &local->cvars[flow - fq->flows]; 1416 1417 return codel_dequeue(txqi, 1418 &flow->backlog, 1419 cparams, 1420 cvars, 1421 cstats, 1422 codel_skb_len_func, 1423 codel_skb_time_func, 1424 codel_drop_func, 1425 codel_dequeue_func); 1426 } 1427 1428 static void fq_skb_free_func(struct fq *fq, 1429 struct fq_tin *tin, 1430 struct fq_flow *flow, 1431 struct sk_buff *skb) 1432 { 1433 struct ieee80211_local *local; 1434 1435 local = container_of(fq, struct ieee80211_local, fq); 1436 ieee80211_free_txskb(&local->hw, skb); 1437 } 1438 1439 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1440 struct txq_info *txqi, 1441 struct sk_buff *skb) 1442 { 1443 struct fq *fq = &local->fq; 1444 struct fq_tin *tin = &txqi->tin; 1445 u32 flow_idx = fq_flow_idx(fq, skb); 1446 1447 ieee80211_set_skb_enqueue_time(skb); 1448 1449 spin_lock_bh(&fq->lock); 1450 /* 1451 * For management frames, don't really apply codel etc., 1452 * we don't want to apply any shaping or anything we just 1453 * want to simplify the driver API by having them on the 1454 * txqi. 1455 */ 1456 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1457 IEEE80211_SKB_CB(skb)->control.flags |= 1458 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1459 __skb_queue_tail(&txqi->frags, skb); 1460 } else { 1461 fq_tin_enqueue(fq, tin, flow_idx, skb, 1462 fq_skb_free_func); 1463 } 1464 spin_unlock_bh(&fq->lock); 1465 } 1466 1467 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1468 struct fq_flow *flow, struct sk_buff *skb, 1469 void *data) 1470 { 1471 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1472 1473 return info->control.vif == data; 1474 } 1475 1476 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1477 struct ieee80211_sub_if_data *sdata) 1478 { 1479 struct fq *fq = &local->fq; 1480 struct txq_info *txqi; 1481 struct fq_tin *tin; 1482 struct ieee80211_sub_if_data *ap; 1483 1484 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1485 return; 1486 1487 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1488 1489 if (!ap->vif.txq) 1490 return; 1491 1492 txqi = to_txq_info(ap->vif.txq); 1493 tin = &txqi->tin; 1494 1495 spin_lock_bh(&fq->lock); 1496 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1497 fq_skb_free_func); 1498 spin_unlock_bh(&fq->lock); 1499 } 1500 1501 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1502 struct sta_info *sta, 1503 struct txq_info *txqi, int tid) 1504 { 1505 fq_tin_init(&txqi->tin); 1506 codel_vars_init(&txqi->def_cvars); 1507 codel_stats_init(&txqi->cstats); 1508 __skb_queue_head_init(&txqi->frags); 1509 INIT_LIST_HEAD(&txqi->schedule_order); 1510 1511 txqi->txq.vif = &sdata->vif; 1512 1513 if (!sta) { 1514 sdata->vif.txq = &txqi->txq; 1515 txqi->txq.tid = 0; 1516 txqi->txq.ac = IEEE80211_AC_BE; 1517 1518 return; 1519 } 1520 1521 if (tid == IEEE80211_NUM_TIDS) { 1522 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1523 /* Drivers need to opt in to the management MPDU TXQ */ 1524 if (!ieee80211_hw_check(&sdata->local->hw, 1525 STA_MMPDU_TXQ)) 1526 return; 1527 } else if (!ieee80211_hw_check(&sdata->local->hw, 1528 BUFF_MMPDU_TXQ)) { 1529 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1530 return; 1531 } 1532 txqi->txq.ac = IEEE80211_AC_VO; 1533 } else { 1534 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1535 } 1536 1537 txqi->txq.sta = &sta->sta; 1538 txqi->txq.tid = tid; 1539 sta->sta.txq[tid] = &txqi->txq; 1540 } 1541 1542 void ieee80211_txq_purge(struct ieee80211_local *local, 1543 struct txq_info *txqi) 1544 { 1545 struct fq *fq = &local->fq; 1546 struct fq_tin *tin = &txqi->tin; 1547 1548 spin_lock_bh(&fq->lock); 1549 fq_tin_reset(fq, tin, fq_skb_free_func); 1550 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1551 spin_unlock_bh(&fq->lock); 1552 1553 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1554 list_del_init(&txqi->schedule_order); 1555 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1556 } 1557 1558 void ieee80211_txq_set_params(struct ieee80211_local *local) 1559 { 1560 if (local->hw.wiphy->txq_limit) 1561 local->fq.limit = local->hw.wiphy->txq_limit; 1562 else 1563 local->hw.wiphy->txq_limit = local->fq.limit; 1564 1565 if (local->hw.wiphy->txq_memory_limit) 1566 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1567 else 1568 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1569 1570 if (local->hw.wiphy->txq_quantum) 1571 local->fq.quantum = local->hw.wiphy->txq_quantum; 1572 else 1573 local->hw.wiphy->txq_quantum = local->fq.quantum; 1574 } 1575 1576 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1577 { 1578 struct fq *fq = &local->fq; 1579 int ret; 1580 int i; 1581 bool supp_vht = false; 1582 enum nl80211_band band; 1583 1584 ret = fq_init(fq, 4096); 1585 if (ret) 1586 return ret; 1587 1588 /* 1589 * If the hardware doesn't support VHT, it is safe to limit the maximum 1590 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1591 */ 1592 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1593 struct ieee80211_supported_band *sband; 1594 1595 sband = local->hw.wiphy->bands[band]; 1596 if (!sband) 1597 continue; 1598 1599 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1600 } 1601 1602 if (!supp_vht) 1603 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1604 1605 codel_params_init(&local->cparams); 1606 local->cparams.interval = MS2TIME(100); 1607 local->cparams.target = MS2TIME(20); 1608 local->cparams.ecn = true; 1609 1610 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1611 GFP_KERNEL); 1612 if (!local->cvars) { 1613 spin_lock_bh(&fq->lock); 1614 fq_reset(fq, fq_skb_free_func); 1615 spin_unlock_bh(&fq->lock); 1616 return -ENOMEM; 1617 } 1618 1619 for (i = 0; i < fq->flows_cnt; i++) 1620 codel_vars_init(&local->cvars[i]); 1621 1622 ieee80211_txq_set_params(local); 1623 1624 return 0; 1625 } 1626 1627 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1628 { 1629 struct fq *fq = &local->fq; 1630 1631 kfree(local->cvars); 1632 local->cvars = NULL; 1633 1634 spin_lock_bh(&fq->lock); 1635 fq_reset(fq, fq_skb_free_func); 1636 spin_unlock_bh(&fq->lock); 1637 } 1638 1639 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1640 struct ieee80211_sub_if_data *sdata, 1641 struct sta_info *sta, 1642 struct sk_buff *skb) 1643 { 1644 struct ieee80211_vif *vif; 1645 struct txq_info *txqi; 1646 1647 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1648 return false; 1649 1650 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1651 sdata = container_of(sdata->bss, 1652 struct ieee80211_sub_if_data, u.ap); 1653 1654 vif = &sdata->vif; 1655 txqi = ieee80211_get_txq(local, vif, sta, skb); 1656 1657 if (!txqi) 1658 return false; 1659 1660 ieee80211_txq_enqueue(local, txqi, skb); 1661 1662 schedule_and_wake_txq(local, txqi); 1663 1664 return true; 1665 } 1666 1667 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1668 struct ieee80211_vif *vif, 1669 struct sta_info *sta, 1670 struct sk_buff_head *skbs, 1671 bool txpending) 1672 { 1673 struct ieee80211_tx_control control = {}; 1674 struct sk_buff *skb, *tmp; 1675 unsigned long flags; 1676 1677 skb_queue_walk_safe(skbs, skb, tmp) { 1678 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1679 int q = info->hw_queue; 1680 1681 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1682 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1683 __skb_unlink(skb, skbs); 1684 ieee80211_free_txskb(&local->hw, skb); 1685 continue; 1686 } 1687 #endif 1688 1689 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1690 if (local->queue_stop_reasons[q] || 1691 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1692 if (unlikely(info->flags & 1693 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1694 if (local->queue_stop_reasons[q] & 1695 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1696 /* 1697 * Drop off-channel frames if queues 1698 * are stopped for any reason other 1699 * than off-channel operation. Never 1700 * queue them. 1701 */ 1702 spin_unlock_irqrestore( 1703 &local->queue_stop_reason_lock, 1704 flags); 1705 ieee80211_purge_tx_queue(&local->hw, 1706 skbs); 1707 return true; 1708 } 1709 } else { 1710 1711 /* 1712 * Since queue is stopped, queue up frames for 1713 * later transmission from the tx-pending 1714 * tasklet when the queue is woken again. 1715 */ 1716 if (txpending) 1717 skb_queue_splice_init(skbs, 1718 &local->pending[q]); 1719 else 1720 skb_queue_splice_tail_init(skbs, 1721 &local->pending[q]); 1722 1723 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1724 flags); 1725 return false; 1726 } 1727 } 1728 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1729 1730 info->control.vif = vif; 1731 control.sta = sta ? &sta->sta : NULL; 1732 1733 __skb_unlink(skb, skbs); 1734 drv_tx(local, &control, skb); 1735 } 1736 1737 return true; 1738 } 1739 1740 /* 1741 * Returns false if the frame couldn't be transmitted but was queued instead. 1742 */ 1743 static bool __ieee80211_tx(struct ieee80211_local *local, 1744 struct sk_buff_head *skbs, struct sta_info *sta, 1745 bool txpending) 1746 { 1747 struct ieee80211_tx_info *info; 1748 struct ieee80211_sub_if_data *sdata; 1749 struct ieee80211_vif *vif; 1750 struct sk_buff *skb; 1751 bool result; 1752 1753 if (WARN_ON(skb_queue_empty(skbs))) 1754 return true; 1755 1756 skb = skb_peek(skbs); 1757 info = IEEE80211_SKB_CB(skb); 1758 sdata = vif_to_sdata(info->control.vif); 1759 if (sta && !sta->uploaded) 1760 sta = NULL; 1761 1762 switch (sdata->vif.type) { 1763 case NL80211_IFTYPE_MONITOR: 1764 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1765 vif = &sdata->vif; 1766 break; 1767 } 1768 sdata = rcu_dereference(local->monitor_sdata); 1769 if (sdata) { 1770 vif = &sdata->vif; 1771 info->hw_queue = 1772 vif->hw_queue[skb_get_queue_mapping(skb)]; 1773 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1774 ieee80211_purge_tx_queue(&local->hw, skbs); 1775 return true; 1776 } else 1777 vif = NULL; 1778 break; 1779 case NL80211_IFTYPE_AP_VLAN: 1780 sdata = container_of(sdata->bss, 1781 struct ieee80211_sub_if_data, u.ap); 1782 fallthrough; 1783 default: 1784 vif = &sdata->vif; 1785 break; 1786 } 1787 1788 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1789 1790 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1791 1792 return result; 1793 } 1794 1795 /* 1796 * Invoke TX handlers, return 0 on success and non-zero if the 1797 * frame was dropped or queued. 1798 * 1799 * The handlers are split into an early and late part. The latter is everything 1800 * that can be sensitive to reordering, and will be deferred to after packets 1801 * are dequeued from the intermediate queues (when they are enabled). 1802 */ 1803 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1804 { 1805 ieee80211_tx_result res = TX_DROP; 1806 1807 #define CALL_TXH(txh) \ 1808 do { \ 1809 res = txh(tx); \ 1810 if (res != TX_CONTINUE) \ 1811 goto txh_done; \ 1812 } while (0) 1813 1814 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1815 CALL_TXH(ieee80211_tx_h_check_assoc); 1816 CALL_TXH(ieee80211_tx_h_ps_buf); 1817 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1818 CALL_TXH(ieee80211_tx_h_select_key); 1819 1820 txh_done: 1821 if (unlikely(res == TX_DROP)) { 1822 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1823 if (tx->skb) 1824 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1825 else 1826 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1827 return -1; 1828 } else if (unlikely(res == TX_QUEUED)) { 1829 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1830 return -1; 1831 } 1832 1833 return 0; 1834 } 1835 1836 /* 1837 * Late handlers can be called while the sta lock is held. Handlers that can 1838 * cause packets to be generated will cause deadlock! 1839 */ 1840 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1841 { 1842 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1843 ieee80211_tx_result res = TX_CONTINUE; 1844 1845 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1846 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1847 1848 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1849 __skb_queue_tail(&tx->skbs, tx->skb); 1850 tx->skb = NULL; 1851 goto txh_done; 1852 } 1853 1854 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1855 CALL_TXH(ieee80211_tx_h_sequence); 1856 CALL_TXH(ieee80211_tx_h_fragment); 1857 /* handlers after fragment must be aware of tx info fragmentation! */ 1858 CALL_TXH(ieee80211_tx_h_stats); 1859 CALL_TXH(ieee80211_tx_h_encrypt); 1860 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1861 CALL_TXH(ieee80211_tx_h_calculate_duration); 1862 #undef CALL_TXH 1863 1864 txh_done: 1865 if (unlikely(res == TX_DROP)) { 1866 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1867 if (tx->skb) 1868 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1869 else 1870 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1871 return -1; 1872 } else if (unlikely(res == TX_QUEUED)) { 1873 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1874 return -1; 1875 } 1876 1877 return 0; 1878 } 1879 1880 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1881 { 1882 int r = invoke_tx_handlers_early(tx); 1883 1884 if (r) 1885 return r; 1886 return invoke_tx_handlers_late(tx); 1887 } 1888 1889 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1890 struct ieee80211_vif *vif, struct sk_buff *skb, 1891 int band, struct ieee80211_sta **sta) 1892 { 1893 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1894 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1895 struct ieee80211_tx_data tx; 1896 struct sk_buff *skb2; 1897 1898 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1899 return false; 1900 1901 info->band = band; 1902 info->control.vif = vif; 1903 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1904 1905 if (invoke_tx_handlers(&tx)) 1906 return false; 1907 1908 if (sta) { 1909 if (tx.sta) 1910 *sta = &tx.sta->sta; 1911 else 1912 *sta = NULL; 1913 } 1914 1915 /* this function isn't suitable for fragmented data frames */ 1916 skb2 = __skb_dequeue(&tx.skbs); 1917 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1918 ieee80211_free_txskb(hw, skb2); 1919 ieee80211_purge_tx_queue(hw, &tx.skbs); 1920 return false; 1921 } 1922 1923 return true; 1924 } 1925 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1926 1927 /* 1928 * Returns false if the frame couldn't be transmitted but was queued instead. 1929 */ 1930 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1931 struct sta_info *sta, struct sk_buff *skb, 1932 bool txpending) 1933 { 1934 struct ieee80211_local *local = sdata->local; 1935 struct ieee80211_tx_data tx; 1936 ieee80211_tx_result res_prepare; 1937 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1938 bool result = true; 1939 1940 if (unlikely(skb->len < 10)) { 1941 dev_kfree_skb(skb); 1942 return true; 1943 } 1944 1945 /* initialises tx */ 1946 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1947 1948 if (unlikely(res_prepare == TX_DROP)) { 1949 ieee80211_free_txskb(&local->hw, skb); 1950 return true; 1951 } else if (unlikely(res_prepare == TX_QUEUED)) { 1952 return true; 1953 } 1954 1955 /* set up hw_queue value early */ 1956 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1957 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1958 info->hw_queue = 1959 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1960 1961 if (invoke_tx_handlers_early(&tx)) 1962 return true; 1963 1964 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1965 return true; 1966 1967 if (!invoke_tx_handlers_late(&tx)) 1968 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1969 1970 return result; 1971 } 1972 1973 /* device xmit handlers */ 1974 1975 enum ieee80211_encrypt { 1976 ENCRYPT_NO, 1977 ENCRYPT_MGMT, 1978 ENCRYPT_DATA, 1979 }; 1980 1981 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1982 struct sk_buff *skb, 1983 int head_need, 1984 enum ieee80211_encrypt encrypt) 1985 { 1986 struct ieee80211_local *local = sdata->local; 1987 bool enc_tailroom; 1988 int tail_need = 0; 1989 1990 enc_tailroom = encrypt == ENCRYPT_MGMT || 1991 (encrypt == ENCRYPT_DATA && 1992 sdata->crypto_tx_tailroom_needed_cnt); 1993 1994 if (enc_tailroom) { 1995 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1996 tail_need -= skb_tailroom(skb); 1997 tail_need = max_t(int, tail_need, 0); 1998 } 1999 2000 if (skb_cloned(skb) && 2001 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2002 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2003 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2004 else if (head_need || tail_need) 2005 I802_DEBUG_INC(local->tx_expand_skb_head); 2006 else 2007 return 0; 2008 2009 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2010 wiphy_debug(local->hw.wiphy, 2011 "failed to reallocate TX buffer\n"); 2012 return -ENOMEM; 2013 } 2014 2015 return 0; 2016 } 2017 2018 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2019 struct sta_info *sta, struct sk_buff *skb) 2020 { 2021 struct ieee80211_local *local = sdata->local; 2022 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2023 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2024 int headroom; 2025 enum ieee80211_encrypt encrypt; 2026 2027 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2028 encrypt = ENCRYPT_NO; 2029 else if (ieee80211_is_mgmt(hdr->frame_control)) 2030 encrypt = ENCRYPT_MGMT; 2031 else 2032 encrypt = ENCRYPT_DATA; 2033 2034 headroom = local->tx_headroom; 2035 if (encrypt != ENCRYPT_NO) 2036 headroom += IEEE80211_ENCRYPT_HEADROOM; 2037 headroom -= skb_headroom(skb); 2038 headroom = max_t(int, 0, headroom); 2039 2040 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2041 ieee80211_free_txskb(&local->hw, skb); 2042 return; 2043 } 2044 2045 /* reload after potential resize */ 2046 hdr = (struct ieee80211_hdr *) skb->data; 2047 info->control.vif = &sdata->vif; 2048 2049 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2050 if (ieee80211_is_data(hdr->frame_control) && 2051 is_unicast_ether_addr(hdr->addr1)) { 2052 if (mesh_nexthop_resolve(sdata, skb)) 2053 return; /* skb queued: don't free */ 2054 } else { 2055 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2056 } 2057 } 2058 2059 ieee80211_set_qos_hdr(sdata, skb); 2060 ieee80211_tx(sdata, sta, skb, false); 2061 } 2062 2063 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2064 { 2065 struct ieee80211_radiotap_header *rthdr = 2066 (struct ieee80211_radiotap_header *)skb->data; 2067 2068 /* check for not even having the fixed radiotap header part */ 2069 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2070 return false; /* too short to be possibly valid */ 2071 2072 /* is it a header version we can trust to find length from? */ 2073 if (unlikely(rthdr->it_version)) 2074 return false; /* only version 0 is supported */ 2075 2076 /* does the skb contain enough to deliver on the alleged length? */ 2077 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2078 return false; /* skb too short for claimed rt header extent */ 2079 2080 return true; 2081 } 2082 2083 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2084 struct net_device *dev) 2085 { 2086 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2087 struct ieee80211_radiotap_iterator iterator; 2088 struct ieee80211_radiotap_header *rthdr = 2089 (struct ieee80211_radiotap_header *) skb->data; 2090 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2091 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2092 NULL); 2093 u16 txflags; 2094 u16 rate = 0; 2095 bool rate_found = false; 2096 u8 rate_retries = 0; 2097 u16 rate_flags = 0; 2098 u8 mcs_known, mcs_flags, mcs_bw; 2099 u16 vht_known; 2100 u8 vht_mcs = 0, vht_nss = 0; 2101 int i; 2102 2103 if (!ieee80211_validate_radiotap_len(skb)) 2104 return false; 2105 2106 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2107 IEEE80211_TX_CTL_DONTFRAG; 2108 2109 /* 2110 * for every radiotap entry that is present 2111 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2112 * entries present, or -EINVAL on error) 2113 */ 2114 2115 while (!ret) { 2116 ret = ieee80211_radiotap_iterator_next(&iterator); 2117 2118 if (ret) 2119 continue; 2120 2121 /* see if this argument is something we can use */ 2122 switch (iterator.this_arg_index) { 2123 /* 2124 * You must take care when dereferencing iterator.this_arg 2125 * for multibyte types... the pointer is not aligned. Use 2126 * get_unaligned((type *)iterator.this_arg) to dereference 2127 * iterator.this_arg for type "type" safely on all arches. 2128 */ 2129 case IEEE80211_RADIOTAP_FLAGS: 2130 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2131 /* 2132 * this indicates that the skb we have been 2133 * handed has the 32-bit FCS CRC at the end... 2134 * we should react to that by snipping it off 2135 * because it will be recomputed and added 2136 * on transmission 2137 */ 2138 if (skb->len < (iterator._max_length + FCS_LEN)) 2139 return false; 2140 2141 skb_trim(skb, skb->len - FCS_LEN); 2142 } 2143 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2144 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2145 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2146 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2147 break; 2148 2149 case IEEE80211_RADIOTAP_TX_FLAGS: 2150 txflags = get_unaligned_le16(iterator.this_arg); 2151 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2152 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2153 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2154 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2155 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2156 info->control.flags |= 2157 IEEE80211_TX_CTRL_DONT_REORDER; 2158 break; 2159 2160 case IEEE80211_RADIOTAP_RATE: 2161 rate = *iterator.this_arg; 2162 rate_flags = 0; 2163 rate_found = true; 2164 break; 2165 2166 case IEEE80211_RADIOTAP_ANTENNA: 2167 /* this can appear multiple times, keep a bitmap */ 2168 info->control.antennas |= BIT(*iterator.this_arg); 2169 break; 2170 2171 case IEEE80211_RADIOTAP_DATA_RETRIES: 2172 rate_retries = *iterator.this_arg; 2173 break; 2174 2175 case IEEE80211_RADIOTAP_MCS: 2176 mcs_known = iterator.this_arg[0]; 2177 mcs_flags = iterator.this_arg[1]; 2178 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2179 break; 2180 2181 rate_found = true; 2182 rate = iterator.this_arg[2]; 2183 rate_flags = IEEE80211_TX_RC_MCS; 2184 2185 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2186 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2187 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2188 2189 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2190 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2191 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2192 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2193 2194 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2195 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2196 info->flags |= IEEE80211_TX_CTL_LDPC; 2197 2198 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2199 u8 stbc = u8_get_bits(mcs_flags, 2200 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2201 2202 info->flags |= 2203 u32_encode_bits(stbc, 2204 IEEE80211_TX_CTL_STBC); 2205 } 2206 break; 2207 2208 case IEEE80211_RADIOTAP_VHT: 2209 vht_known = get_unaligned_le16(iterator.this_arg); 2210 rate_found = true; 2211 2212 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2213 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2214 (iterator.this_arg[2] & 2215 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2216 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2217 if (vht_known & 2218 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2219 if (iterator.this_arg[3] == 1) 2220 rate_flags |= 2221 IEEE80211_TX_RC_40_MHZ_WIDTH; 2222 else if (iterator.this_arg[3] == 4) 2223 rate_flags |= 2224 IEEE80211_TX_RC_80_MHZ_WIDTH; 2225 else if (iterator.this_arg[3] == 11) 2226 rate_flags |= 2227 IEEE80211_TX_RC_160_MHZ_WIDTH; 2228 } 2229 2230 vht_mcs = iterator.this_arg[4] >> 4; 2231 if (vht_mcs > 11) 2232 vht_mcs = 0; 2233 vht_nss = iterator.this_arg[4] & 0xF; 2234 if (!vht_nss || vht_nss > 8) 2235 vht_nss = 1; 2236 break; 2237 2238 /* 2239 * Please update the file 2240 * Documentation/networking/mac80211-injection.rst 2241 * when parsing new fields here. 2242 */ 2243 2244 default: 2245 break; 2246 } 2247 } 2248 2249 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2250 return false; 2251 2252 if (rate_found) { 2253 struct ieee80211_supported_band *sband = 2254 local->hw.wiphy->bands[info->band]; 2255 2256 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2257 2258 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2259 info->control.rates[i].idx = -1; 2260 info->control.rates[i].flags = 0; 2261 info->control.rates[i].count = 0; 2262 } 2263 2264 if (rate_flags & IEEE80211_TX_RC_MCS) { 2265 /* reset antennas if not enough */ 2266 if (IEEE80211_HT_MCS_CHAINS(rate) > 2267 hweight8(info->control.antennas)) 2268 info->control.antennas = 0; 2269 2270 info->control.rates[0].idx = rate; 2271 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2272 /* reset antennas if not enough */ 2273 if (vht_nss > hweight8(info->control.antennas)) 2274 info->control.antennas = 0; 2275 2276 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2277 vht_nss); 2278 } else if (sband) { 2279 for (i = 0; i < sband->n_bitrates; i++) { 2280 if (rate * 5 != sband->bitrates[i].bitrate) 2281 continue; 2282 2283 info->control.rates[0].idx = i; 2284 break; 2285 } 2286 } 2287 2288 if (info->control.rates[0].idx < 0) 2289 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2290 2291 info->control.rates[0].flags = rate_flags; 2292 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2293 local->hw.max_rate_tries); 2294 } 2295 2296 return true; 2297 } 2298 2299 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2300 struct net_device *dev) 2301 { 2302 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2303 struct ieee80211_chanctx_conf *chanctx_conf; 2304 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2305 struct ieee80211_hdr *hdr; 2306 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2307 struct cfg80211_chan_def *chandef; 2308 u16 len_rthdr; 2309 int hdrlen; 2310 2311 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2312 if (unlikely(!ieee80211_sdata_running(sdata))) 2313 goto fail; 2314 2315 memset(info, 0, sizeof(*info)); 2316 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2317 IEEE80211_TX_CTL_INJECTED; 2318 2319 /* Sanity-check the length of the radiotap header */ 2320 if (!ieee80211_validate_radiotap_len(skb)) 2321 goto fail; 2322 2323 /* we now know there is a radiotap header with a length we can use */ 2324 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2325 2326 /* 2327 * fix up the pointers accounting for the radiotap 2328 * header still being in there. We are being given 2329 * a precooked IEEE80211 header so no need for 2330 * normal processing 2331 */ 2332 skb_set_mac_header(skb, len_rthdr); 2333 /* 2334 * these are just fixed to the end of the rt area since we 2335 * don't have any better information and at this point, nobody cares 2336 */ 2337 skb_set_network_header(skb, len_rthdr); 2338 skb_set_transport_header(skb, len_rthdr); 2339 2340 if (skb->len < len_rthdr + 2) 2341 goto fail; 2342 2343 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2344 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2345 2346 if (skb->len < len_rthdr + hdrlen) 2347 goto fail; 2348 2349 /* 2350 * Initialize skb->protocol if the injected frame is a data frame 2351 * carrying a rfc1042 header 2352 */ 2353 if (ieee80211_is_data(hdr->frame_control) && 2354 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2355 u8 *payload = (u8 *)hdr + hdrlen; 2356 2357 if (ether_addr_equal(payload, rfc1042_header)) 2358 skb->protocol = cpu_to_be16((payload[6] << 8) | 2359 payload[7]); 2360 } 2361 2362 rcu_read_lock(); 2363 2364 /* 2365 * We process outgoing injected frames that have a local address 2366 * we handle as though they are non-injected frames. 2367 * This code here isn't entirely correct, the local MAC address 2368 * isn't always enough to find the interface to use; for proper 2369 * VLAN support we have an nl80211-based mechanism. 2370 * 2371 * This is necessary, for example, for old hostapd versions that 2372 * don't use nl80211-based management TX/RX. 2373 */ 2374 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2375 if (!ieee80211_sdata_running(tmp_sdata)) 2376 continue; 2377 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2378 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2379 continue; 2380 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2381 sdata = tmp_sdata; 2382 break; 2383 } 2384 } 2385 2386 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2387 if (!chanctx_conf) { 2388 tmp_sdata = rcu_dereference(local->monitor_sdata); 2389 if (tmp_sdata) 2390 chanctx_conf = 2391 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2392 } 2393 2394 if (chanctx_conf) 2395 chandef = &chanctx_conf->def; 2396 else if (!local->use_chanctx) 2397 chandef = &local->_oper_chandef; 2398 else 2399 goto fail_rcu; 2400 2401 /* 2402 * Frame injection is not allowed if beaconing is not allowed 2403 * or if we need radar detection. Beaconing is usually not allowed when 2404 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2405 * Passive scan is also used in world regulatory domains where 2406 * your country is not known and as such it should be treated as 2407 * NO TX unless the channel is explicitly allowed in which case 2408 * your current regulatory domain would not have the passive scan 2409 * flag. 2410 * 2411 * Since AP mode uses monitor interfaces to inject/TX management 2412 * frames we can make AP mode the exception to this rule once it 2413 * supports radar detection as its implementation can deal with 2414 * radar detection by itself. We can do that later by adding a 2415 * monitor flag interfaces used for AP support. 2416 */ 2417 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2418 sdata->vif.type)) 2419 goto fail_rcu; 2420 2421 info->band = chandef->chan->band; 2422 2423 /* Initialize skb->priority according to frame type and TID class, 2424 * with respect to the sub interface that the frame will actually 2425 * be transmitted on. If the DONT_REORDER flag is set, the original 2426 * skb-priority is preserved to assure frames injected with this 2427 * flag are not reordered relative to each other. 2428 */ 2429 ieee80211_select_queue_80211(sdata, skb, hdr); 2430 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2431 2432 /* 2433 * Process the radiotap header. This will now take into account the 2434 * selected chandef above to accurately set injection rates and 2435 * retransmissions. 2436 */ 2437 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2438 goto fail_rcu; 2439 2440 /* remove the injection radiotap header */ 2441 skb_pull(skb, len_rthdr); 2442 2443 ieee80211_xmit(sdata, NULL, skb); 2444 rcu_read_unlock(); 2445 2446 return NETDEV_TX_OK; 2447 2448 fail_rcu: 2449 rcu_read_unlock(); 2450 fail: 2451 dev_kfree_skb(skb); 2452 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2453 } 2454 2455 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2456 { 2457 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2458 2459 return ethertype == ETH_P_TDLS && 2460 skb->len > 14 && 2461 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2462 } 2463 2464 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2465 struct sk_buff *skb, 2466 struct sta_info **sta_out) 2467 { 2468 struct sta_info *sta; 2469 2470 switch (sdata->vif.type) { 2471 case NL80211_IFTYPE_AP_VLAN: 2472 sta = rcu_dereference(sdata->u.vlan.sta); 2473 if (sta) { 2474 *sta_out = sta; 2475 return 0; 2476 } else if (sdata->wdev.use_4addr) { 2477 return -ENOLINK; 2478 } 2479 fallthrough; 2480 case NL80211_IFTYPE_AP: 2481 case NL80211_IFTYPE_OCB: 2482 case NL80211_IFTYPE_ADHOC: 2483 if (is_multicast_ether_addr(skb->data)) { 2484 *sta_out = ERR_PTR(-ENOENT); 2485 return 0; 2486 } 2487 sta = sta_info_get_bss(sdata, skb->data); 2488 break; 2489 #ifdef CONFIG_MAC80211_MESH 2490 case NL80211_IFTYPE_MESH_POINT: 2491 /* determined much later */ 2492 *sta_out = NULL; 2493 return 0; 2494 #endif 2495 case NL80211_IFTYPE_STATION: 2496 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2497 sta = sta_info_get(sdata, skb->data); 2498 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2499 if (test_sta_flag(sta, 2500 WLAN_STA_TDLS_PEER_AUTH)) { 2501 *sta_out = sta; 2502 return 0; 2503 } 2504 2505 /* 2506 * TDLS link during setup - throw out frames to 2507 * peer. Allow TDLS-setup frames to unauthorized 2508 * peers for the special case of a link teardown 2509 * after a TDLS sta is removed due to being 2510 * unreachable. 2511 */ 2512 if (!ieee80211_is_tdls_setup(skb)) 2513 return -EINVAL; 2514 } 2515 2516 } 2517 2518 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2519 if (!sta) 2520 return -ENOLINK; 2521 break; 2522 default: 2523 return -EINVAL; 2524 } 2525 2526 *sta_out = sta ?: ERR_PTR(-ENOENT); 2527 return 0; 2528 } 2529 2530 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2531 struct sk_buff *skb, 2532 u32 *info_flags, 2533 u64 *cookie) 2534 { 2535 struct sk_buff *ack_skb; 2536 u16 info_id = 0; 2537 2538 if (skb->sk) 2539 ack_skb = skb_clone_sk(skb); 2540 else 2541 ack_skb = skb_clone(skb, GFP_ATOMIC); 2542 2543 if (ack_skb) { 2544 unsigned long flags; 2545 int id; 2546 2547 spin_lock_irqsave(&local->ack_status_lock, flags); 2548 id = idr_alloc(&local->ack_status_frames, ack_skb, 2549 1, 0x2000, GFP_ATOMIC); 2550 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2551 2552 if (id >= 0) { 2553 info_id = id; 2554 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2555 if (cookie) { 2556 *cookie = ieee80211_mgmt_tx_cookie(local); 2557 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2558 } 2559 } else { 2560 kfree_skb(ack_skb); 2561 } 2562 } 2563 2564 return info_id; 2565 } 2566 2567 /** 2568 * ieee80211_build_hdr - build 802.11 header in the given frame 2569 * @sdata: virtual interface to build the header for 2570 * @skb: the skb to build the header in 2571 * @info_flags: skb flags to set 2572 * @sta: the station pointer 2573 * @ctrl_flags: info control flags to set 2574 * @cookie: cookie pointer to fill (if not %NULL) 2575 * 2576 * This function takes the skb with 802.3 header and reformats the header to 2577 * the appropriate IEEE 802.11 header based on which interface the packet is 2578 * being transmitted on. 2579 * 2580 * Note that this function also takes care of the TX status request and 2581 * potential unsharing of the SKB - this needs to be interleaved with the 2582 * header building. 2583 * 2584 * The function requires the read-side RCU lock held 2585 * 2586 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2587 */ 2588 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2589 struct sk_buff *skb, u32 info_flags, 2590 struct sta_info *sta, u32 ctrl_flags, 2591 u64 *cookie) 2592 { 2593 struct ieee80211_local *local = sdata->local; 2594 struct ieee80211_tx_info *info; 2595 int head_need; 2596 u16 ethertype, hdrlen, meshhdrlen = 0; 2597 __le16 fc; 2598 struct ieee80211_hdr hdr; 2599 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2600 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2601 const u8 *encaps_data; 2602 int encaps_len, skip_header_bytes; 2603 bool wme_sta = false, authorized = false; 2604 bool tdls_peer; 2605 bool multicast; 2606 u16 info_id = 0; 2607 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2608 enum nl80211_band band; 2609 int ret; 2610 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2611 2612 if (IS_ERR(sta)) 2613 sta = NULL; 2614 2615 #ifdef CONFIG_MAC80211_DEBUGFS 2616 if (local->force_tx_status) 2617 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2618 #endif 2619 2620 /* convert Ethernet header to proper 802.11 header (based on 2621 * operation mode) */ 2622 ethertype = (skb->data[12] << 8) | skb->data[13]; 2623 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2624 2625 if (!ieee80211_vif_is_mld(&sdata->vif)) 2626 chanctx_conf = 2627 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2628 2629 switch (sdata->vif.type) { 2630 case NL80211_IFTYPE_AP_VLAN: 2631 if (sdata->wdev.use_4addr) { 2632 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2633 /* RA TA DA SA */ 2634 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2635 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2636 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2637 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2638 hdrlen = 30; 2639 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2640 wme_sta = sta->sta.wme; 2641 } 2642 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2643 struct ieee80211_sub_if_data *ap_sdata; 2644 2645 /* override chanctx_conf from AP (we don't have one) */ 2646 ap_sdata = container_of(sdata->bss, 2647 struct ieee80211_sub_if_data, 2648 u.ap); 2649 chanctx_conf = 2650 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2651 } 2652 if (sdata->wdev.use_4addr) 2653 break; 2654 fallthrough; 2655 case NL80211_IFTYPE_AP: 2656 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2657 /* DA BSSID SA */ 2658 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2659 2660 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2661 struct ieee80211_link_data *link; 2662 2663 link_id = sta->deflink.link_id; 2664 link = rcu_dereference(sdata->link[link_id]); 2665 if (WARN_ON(!link)) { 2666 ret = -ENOLINK; 2667 goto free; 2668 } 2669 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2670 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2671 (sta && sta->sta.mlo)) { 2672 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2673 } else { 2674 struct ieee80211_bss_conf *conf; 2675 2676 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2677 if (unlikely(!conf)) { 2678 ret = -ENOLINK; 2679 goto free; 2680 } 2681 2682 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2683 } 2684 2685 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2686 hdrlen = 24; 2687 break; 2688 #ifdef CONFIG_MAC80211_MESH 2689 case NL80211_IFTYPE_MESH_POINT: 2690 if (!is_multicast_ether_addr(skb->data)) { 2691 struct sta_info *next_hop; 2692 bool mpp_lookup = true; 2693 2694 mpath = mesh_path_lookup(sdata, skb->data); 2695 if (mpath) { 2696 mpp_lookup = false; 2697 next_hop = rcu_dereference(mpath->next_hop); 2698 if (!next_hop || 2699 !(mpath->flags & (MESH_PATH_ACTIVE | 2700 MESH_PATH_RESOLVING))) 2701 mpp_lookup = true; 2702 } 2703 2704 if (mpp_lookup) { 2705 mppath = mpp_path_lookup(sdata, skb->data); 2706 if (mppath) 2707 mppath->exp_time = jiffies; 2708 } 2709 2710 if (mppath && mpath) 2711 mesh_path_del(sdata, mpath->dst); 2712 } 2713 2714 /* 2715 * Use address extension if it is a packet from 2716 * another interface or if we know the destination 2717 * is being proxied by a portal (i.e. portal address 2718 * differs from proxied address) 2719 */ 2720 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2721 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2722 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2723 skb->data, skb->data + ETH_ALEN); 2724 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2725 NULL, NULL); 2726 } else { 2727 /* DS -> MBSS (802.11-2012 13.11.3.3). 2728 * For unicast with unknown forwarding information, 2729 * destination might be in the MBSS or if that fails 2730 * forwarded to another mesh gate. In either case 2731 * resolution will be handled in ieee80211_xmit(), so 2732 * leave the original DA. This also works for mcast */ 2733 const u8 *mesh_da = skb->data; 2734 2735 if (mppath) 2736 mesh_da = mppath->mpp; 2737 else if (mpath) 2738 mesh_da = mpath->dst; 2739 2740 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2741 mesh_da, sdata->vif.addr); 2742 if (is_multicast_ether_addr(mesh_da)) 2743 /* DA TA mSA AE:SA */ 2744 meshhdrlen = ieee80211_new_mesh_header( 2745 sdata, &mesh_hdr, 2746 skb->data + ETH_ALEN, NULL); 2747 else 2748 /* RA TA mDA mSA AE:DA SA */ 2749 meshhdrlen = ieee80211_new_mesh_header( 2750 sdata, &mesh_hdr, skb->data, 2751 skb->data + ETH_ALEN); 2752 2753 } 2754 2755 /* For injected frames, fill RA right away as nexthop lookup 2756 * will be skipped. 2757 */ 2758 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2759 is_zero_ether_addr(hdr.addr1)) 2760 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2761 break; 2762 #endif 2763 case NL80211_IFTYPE_STATION: 2764 /* we already did checks when looking up the RA STA */ 2765 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2766 2767 if (tdls_peer) { 2768 /* For TDLS only one link can be valid with peer STA */ 2769 int tdls_link_id = sta->sta.valid_links ? 2770 __ffs(sta->sta.valid_links) : 0; 2771 struct ieee80211_link_data *link; 2772 2773 /* DA SA BSSID */ 2774 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2775 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2776 link = rcu_dereference(sdata->link[tdls_link_id]); 2777 if (WARN_ON_ONCE(!link)) { 2778 ret = -EINVAL; 2779 goto free; 2780 } 2781 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2782 hdrlen = 24; 2783 } else if (sdata->u.mgd.use_4addr && 2784 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2785 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2786 IEEE80211_FCTL_TODS); 2787 /* RA TA DA SA */ 2788 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2789 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2790 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2791 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2792 hdrlen = 30; 2793 } else { 2794 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2795 /* BSSID SA DA */ 2796 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2797 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2798 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2799 hdrlen = 24; 2800 } 2801 break; 2802 case NL80211_IFTYPE_OCB: 2803 /* DA SA BSSID */ 2804 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2805 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2806 eth_broadcast_addr(hdr.addr3); 2807 hdrlen = 24; 2808 break; 2809 case NL80211_IFTYPE_ADHOC: 2810 /* DA SA BSSID */ 2811 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2812 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2813 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2814 hdrlen = 24; 2815 break; 2816 default: 2817 ret = -EINVAL; 2818 goto free; 2819 } 2820 2821 if (!chanctx_conf) { 2822 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2823 ret = -ENOTCONN; 2824 goto free; 2825 } 2826 /* MLD transmissions must not rely on the band */ 2827 band = 0; 2828 } else { 2829 band = chanctx_conf->def.chan->band; 2830 } 2831 2832 multicast = is_multicast_ether_addr(hdr.addr1); 2833 2834 /* sta is always NULL for mesh */ 2835 if (sta) { 2836 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2837 wme_sta = sta->sta.wme; 2838 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2839 /* For mesh, the use of the QoS header is mandatory */ 2840 wme_sta = true; 2841 } 2842 2843 /* receiver does QoS (which also means we do) use it */ 2844 if (wme_sta) { 2845 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2846 hdrlen += 2; 2847 } 2848 2849 /* 2850 * Drop unicast frames to unauthorised stations unless they are 2851 * EAPOL frames from the local station. 2852 */ 2853 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2854 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2855 !multicast && !authorized && 2856 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2857 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2858 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2859 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2860 sdata->name, hdr.addr1); 2861 #endif 2862 2863 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2864 2865 ret = -EPERM; 2866 goto free; 2867 } 2868 2869 if (unlikely(!multicast && 2870 ((skb->sk && 2871 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2872 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2873 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2874 cookie); 2875 2876 /* 2877 * If the skb is shared we need to obtain our own copy. 2878 */ 2879 skb = skb_share_check(skb, GFP_ATOMIC); 2880 if (unlikely(!skb)) { 2881 ret = -ENOMEM; 2882 goto free; 2883 } 2884 2885 hdr.frame_control = fc; 2886 hdr.duration_id = 0; 2887 hdr.seq_ctrl = 0; 2888 2889 skip_header_bytes = ETH_HLEN; 2890 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2891 encaps_data = bridge_tunnel_header; 2892 encaps_len = sizeof(bridge_tunnel_header); 2893 skip_header_bytes -= 2; 2894 } else if (ethertype >= ETH_P_802_3_MIN) { 2895 encaps_data = rfc1042_header; 2896 encaps_len = sizeof(rfc1042_header); 2897 skip_header_bytes -= 2; 2898 } else { 2899 encaps_data = NULL; 2900 encaps_len = 0; 2901 } 2902 2903 skb_pull(skb, skip_header_bytes); 2904 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2905 2906 /* 2907 * So we need to modify the skb header and hence need a copy of 2908 * that. The head_need variable above doesn't, so far, include 2909 * the needed header space that we don't need right away. If we 2910 * can, then we don't reallocate right now but only after the 2911 * frame arrives at the master device (if it does...) 2912 * 2913 * If we cannot, however, then we will reallocate to include all 2914 * the ever needed space. Also, if we need to reallocate it anyway, 2915 * make it big enough for everything we may ever need. 2916 */ 2917 2918 if (head_need > 0 || skb_cloned(skb)) { 2919 head_need += IEEE80211_ENCRYPT_HEADROOM; 2920 head_need += local->tx_headroom; 2921 head_need = max_t(int, 0, head_need); 2922 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2923 ieee80211_free_txskb(&local->hw, skb); 2924 skb = NULL; 2925 return ERR_PTR(-ENOMEM); 2926 } 2927 } 2928 2929 if (encaps_data) 2930 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2931 2932 #ifdef CONFIG_MAC80211_MESH 2933 if (meshhdrlen > 0) 2934 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2935 #endif 2936 2937 if (ieee80211_is_data_qos(fc)) { 2938 __le16 *qos_control; 2939 2940 qos_control = skb_push(skb, 2); 2941 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2942 /* 2943 * Maybe we could actually set some fields here, for now just 2944 * initialise to zero to indicate no special operation. 2945 */ 2946 *qos_control = 0; 2947 } else 2948 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2949 2950 skb_reset_mac_header(skb); 2951 2952 info = IEEE80211_SKB_CB(skb); 2953 memset(info, 0, sizeof(*info)); 2954 2955 info->flags = info_flags; 2956 if (info_id) { 2957 info->status_data = info_id; 2958 info->status_data_idr = 1; 2959 } 2960 info->band = band; 2961 2962 if (likely(!cookie)) { 2963 ctrl_flags |= u32_encode_bits(link_id, 2964 IEEE80211_TX_CTRL_MLO_LINK); 2965 } else { 2966 unsigned int pre_conf_link_id; 2967 2968 /* 2969 * ctrl_flags already have been set by 2970 * ieee80211_tx_control_port(), here 2971 * we just sanity check that 2972 */ 2973 2974 pre_conf_link_id = u32_get_bits(ctrl_flags, 2975 IEEE80211_TX_CTRL_MLO_LINK); 2976 2977 if (pre_conf_link_id != link_id && 2978 link_id != IEEE80211_LINK_UNSPECIFIED) { 2979 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2980 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2981 sdata->name, hdr.addr1, 2982 pre_conf_link_id, link_id); 2983 #endif 2984 ret = -EINVAL; 2985 goto free; 2986 } 2987 } 2988 2989 info->control.flags = ctrl_flags; 2990 2991 return skb; 2992 free: 2993 kfree_skb(skb); 2994 return ERR_PTR(ret); 2995 } 2996 2997 /* 2998 * fast-xmit overview 2999 * 3000 * The core idea of this fast-xmit is to remove per-packet checks by checking 3001 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3002 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3003 * much less work can be done per packet. For example, fragmentation must be 3004 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3005 * in the code here. 3006 * 3007 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3008 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3009 * 3010 * The most difficult part of this is that when any of these assumptions 3011 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3012 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3013 * since the per-packet code no longer checks the conditions. This is reflected 3014 * by the calls to these functions throughout the rest of the code, and must be 3015 * maintained if any of the TX path checks change. 3016 */ 3017 3018 void ieee80211_check_fast_xmit(struct sta_info *sta) 3019 { 3020 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3021 struct ieee80211_local *local = sta->local; 3022 struct ieee80211_sub_if_data *sdata = sta->sdata; 3023 struct ieee80211_hdr *hdr = (void *)build.hdr; 3024 struct ieee80211_chanctx_conf *chanctx_conf; 3025 __le16 fc; 3026 3027 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3028 return; 3029 3030 if (ieee80211_vif_is_mesh(&sdata->vif)) 3031 mesh_fast_tx_flush_sta(sdata, sta); 3032 3033 /* Locking here protects both the pointer itself, and against concurrent 3034 * invocations winning data access races to, e.g., the key pointer that 3035 * is used. 3036 * Without it, the invocation of this function right after the key 3037 * pointer changes wouldn't be sufficient, as another CPU could access 3038 * the pointer, then stall, and then do the cache update after the CPU 3039 * that invalidated the key. 3040 * With the locking, such scenarios cannot happen as the check for the 3041 * key and the fast-tx assignment are done atomically, so the CPU that 3042 * modifies the key will either wait or other one will see the key 3043 * cleared/changed already. 3044 */ 3045 spin_lock_bh(&sta->lock); 3046 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3047 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3048 sdata->vif.type == NL80211_IFTYPE_STATION) 3049 goto out; 3050 3051 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3052 goto out; 3053 3054 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3055 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3056 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3057 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3058 goto out; 3059 3060 if (sdata->noack_map) 3061 goto out; 3062 3063 /* fast-xmit doesn't handle fragmentation at all */ 3064 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3065 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3066 goto out; 3067 3068 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3069 rcu_read_lock(); 3070 chanctx_conf = 3071 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3072 if (!chanctx_conf) { 3073 rcu_read_unlock(); 3074 goto out; 3075 } 3076 build.band = chanctx_conf->def.chan->band; 3077 rcu_read_unlock(); 3078 } else { 3079 /* MLD transmissions must not rely on the band */ 3080 build.band = 0; 3081 } 3082 3083 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3084 3085 switch (sdata->vif.type) { 3086 case NL80211_IFTYPE_ADHOC: 3087 /* DA SA BSSID */ 3088 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3089 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3090 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3091 build.hdr_len = 24; 3092 break; 3093 case NL80211_IFTYPE_STATION: 3094 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3095 /* For TDLS only one link can be valid with peer STA */ 3096 int tdls_link_id = sta->sta.valid_links ? 3097 __ffs(sta->sta.valid_links) : 0; 3098 struct ieee80211_link_data *link; 3099 3100 /* DA SA BSSID */ 3101 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3102 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3103 link = rcu_dereference(sdata->link[tdls_link_id]); 3104 if (WARN_ON_ONCE(!link)) 3105 break; 3106 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3107 build.hdr_len = 24; 3108 break; 3109 } 3110 3111 if (sdata->u.mgd.use_4addr) { 3112 /* non-regular ethertype cannot use the fastpath */ 3113 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3114 IEEE80211_FCTL_TODS); 3115 /* RA TA DA SA */ 3116 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3117 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3118 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3119 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3120 build.hdr_len = 30; 3121 break; 3122 } 3123 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3124 /* BSSID SA DA */ 3125 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3126 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3127 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3128 build.hdr_len = 24; 3129 break; 3130 case NL80211_IFTYPE_AP_VLAN: 3131 if (sdata->wdev.use_4addr) { 3132 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3133 IEEE80211_FCTL_TODS); 3134 /* RA TA DA SA */ 3135 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3136 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3137 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3138 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3139 build.hdr_len = 30; 3140 break; 3141 } 3142 fallthrough; 3143 case NL80211_IFTYPE_AP: 3144 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3145 /* DA BSSID SA */ 3146 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3147 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3148 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3149 } else { 3150 unsigned int link_id = sta->deflink.link_id; 3151 struct ieee80211_link_data *link; 3152 3153 rcu_read_lock(); 3154 link = rcu_dereference(sdata->link[link_id]); 3155 if (WARN_ON(!link)) { 3156 rcu_read_unlock(); 3157 goto out; 3158 } 3159 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3160 rcu_read_unlock(); 3161 } 3162 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3163 build.hdr_len = 24; 3164 break; 3165 default: 3166 /* not handled on fast-xmit */ 3167 goto out; 3168 } 3169 3170 if (sta->sta.wme) { 3171 build.hdr_len += 2; 3172 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3173 } 3174 3175 /* We store the key here so there's no point in using rcu_dereference() 3176 * but that's fine because the code that changes the pointers will call 3177 * this function after doing so. For a single CPU that would be enough, 3178 * for multiple see the comment above. 3179 */ 3180 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3181 if (!build.key) 3182 build.key = rcu_access_pointer(sdata->default_unicast_key); 3183 if (build.key) { 3184 bool gen_iv, iv_spc, mmic; 3185 3186 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3187 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3188 mmic = build.key->conf.flags & 3189 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3190 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3191 3192 /* don't handle software crypto */ 3193 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3194 goto out; 3195 3196 /* Key is being removed */ 3197 if (build.key->flags & KEY_FLAG_TAINTED) 3198 goto out; 3199 3200 switch (build.key->conf.cipher) { 3201 case WLAN_CIPHER_SUITE_CCMP: 3202 case WLAN_CIPHER_SUITE_CCMP_256: 3203 if (gen_iv) 3204 build.pn_offs = build.hdr_len; 3205 if (gen_iv || iv_spc) 3206 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3207 break; 3208 case WLAN_CIPHER_SUITE_GCMP: 3209 case WLAN_CIPHER_SUITE_GCMP_256: 3210 if (gen_iv) 3211 build.pn_offs = build.hdr_len; 3212 if (gen_iv || iv_spc) 3213 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3214 break; 3215 case WLAN_CIPHER_SUITE_TKIP: 3216 /* cannot handle MMIC or IV generation in xmit-fast */ 3217 if (mmic || gen_iv) 3218 goto out; 3219 if (iv_spc) 3220 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3221 break; 3222 case WLAN_CIPHER_SUITE_WEP40: 3223 case WLAN_CIPHER_SUITE_WEP104: 3224 /* cannot handle IV generation in fast-xmit */ 3225 if (gen_iv) 3226 goto out; 3227 if (iv_spc) 3228 build.hdr_len += IEEE80211_WEP_IV_LEN; 3229 break; 3230 case WLAN_CIPHER_SUITE_AES_CMAC: 3231 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3232 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3233 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3234 WARN(1, 3235 "management cipher suite 0x%x enabled for data\n", 3236 build.key->conf.cipher); 3237 goto out; 3238 default: 3239 /* we don't know how to generate IVs for this at all */ 3240 if (WARN_ON(gen_iv)) 3241 goto out; 3242 } 3243 3244 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3245 } 3246 3247 hdr->frame_control = fc; 3248 3249 memcpy(build.hdr + build.hdr_len, 3250 rfc1042_header, sizeof(rfc1042_header)); 3251 build.hdr_len += sizeof(rfc1042_header); 3252 3253 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3254 /* if the kmemdup fails, continue w/o fast_tx */ 3255 3256 out: 3257 /* we might have raced against another call to this function */ 3258 old = rcu_dereference_protected(sta->fast_tx, 3259 lockdep_is_held(&sta->lock)); 3260 rcu_assign_pointer(sta->fast_tx, fast_tx); 3261 if (old) 3262 kfree_rcu(old, rcu_head); 3263 spin_unlock_bh(&sta->lock); 3264 } 3265 3266 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3267 { 3268 struct sta_info *sta; 3269 3270 rcu_read_lock(); 3271 list_for_each_entry_rcu(sta, &local->sta_list, list) 3272 ieee80211_check_fast_xmit(sta); 3273 rcu_read_unlock(); 3274 } 3275 3276 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3277 { 3278 struct ieee80211_local *local = sdata->local; 3279 struct sta_info *sta; 3280 3281 rcu_read_lock(); 3282 3283 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3284 if (sdata != sta->sdata && 3285 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3286 continue; 3287 ieee80211_check_fast_xmit(sta); 3288 } 3289 3290 rcu_read_unlock(); 3291 } 3292 3293 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3294 { 3295 struct ieee80211_fast_tx *fast_tx; 3296 3297 spin_lock_bh(&sta->lock); 3298 fast_tx = rcu_dereference_protected(sta->fast_tx, 3299 lockdep_is_held(&sta->lock)); 3300 RCU_INIT_POINTER(sta->fast_tx, NULL); 3301 spin_unlock_bh(&sta->lock); 3302 3303 if (fast_tx) 3304 kfree_rcu(fast_tx, rcu_head); 3305 } 3306 3307 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3308 struct sk_buff *skb, int headroom) 3309 { 3310 if (skb_headroom(skb) < headroom) { 3311 I802_DEBUG_INC(local->tx_expand_skb_head); 3312 3313 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3314 wiphy_debug(local->hw.wiphy, 3315 "failed to reallocate TX buffer\n"); 3316 return false; 3317 } 3318 } 3319 3320 return true; 3321 } 3322 3323 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3324 struct ieee80211_fast_tx *fast_tx, 3325 struct sk_buff *skb) 3326 { 3327 struct ieee80211_local *local = sdata->local; 3328 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3329 struct ieee80211_hdr *hdr; 3330 struct ethhdr *amsdu_hdr; 3331 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3332 int subframe_len = skb->len - hdr_len; 3333 void *data; 3334 u8 *qc, *h_80211_src, *h_80211_dst; 3335 const u8 *bssid; 3336 3337 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3338 return false; 3339 3340 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3341 return true; 3342 3343 if (!ieee80211_amsdu_realloc_pad(local, skb, 3344 sizeof(*amsdu_hdr) + 3345 local->hw.extra_tx_headroom)) 3346 return false; 3347 3348 data = skb_push(skb, sizeof(*amsdu_hdr)); 3349 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3350 hdr = data; 3351 amsdu_hdr = data + hdr_len; 3352 /* h_80211_src/dst is addr* field within hdr */ 3353 h_80211_src = data + fast_tx->sa_offs; 3354 h_80211_dst = data + fast_tx->da_offs; 3355 3356 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3357 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3358 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3359 3360 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3361 * fields needs to be changed to BSSID for A-MSDU frames depending 3362 * on FromDS/ToDS values. 3363 */ 3364 switch (sdata->vif.type) { 3365 case NL80211_IFTYPE_STATION: 3366 bssid = sdata->vif.cfg.ap_addr; 3367 break; 3368 case NL80211_IFTYPE_AP: 3369 case NL80211_IFTYPE_AP_VLAN: 3370 bssid = sdata->vif.addr; 3371 break; 3372 default: 3373 bssid = NULL; 3374 } 3375 3376 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3377 ether_addr_copy(h_80211_src, bssid); 3378 3379 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3380 ether_addr_copy(h_80211_dst, bssid); 3381 3382 qc = ieee80211_get_qos_ctl(hdr); 3383 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3384 3385 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3386 3387 return true; 3388 } 3389 3390 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3391 struct sta_info *sta, 3392 struct ieee80211_fast_tx *fast_tx, 3393 struct sk_buff *skb, 3394 const u8 *da, const u8 *sa) 3395 { 3396 struct ieee80211_local *local = sdata->local; 3397 struct fq *fq = &local->fq; 3398 struct fq_tin *tin; 3399 struct fq_flow *flow; 3400 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3401 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3402 struct txq_info *txqi; 3403 struct sk_buff **frag_tail, *head; 3404 int subframe_len = skb->len - ETH_ALEN; 3405 u8 max_subframes = sta->sta.max_amsdu_subframes; 3406 int max_frags = local->hw.max_tx_fragments; 3407 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3408 int orig_truesize; 3409 u32 flow_idx; 3410 __be16 len; 3411 void *data; 3412 bool ret = false; 3413 unsigned int orig_len; 3414 int n = 2, nfrags, pad = 0; 3415 u16 hdrlen; 3416 3417 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3418 return false; 3419 3420 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3421 return false; 3422 3423 if (ieee80211_vif_is_mesh(&sdata->vif)) 3424 return false; 3425 3426 if (skb_is_gso(skb)) 3427 return false; 3428 3429 if (!txq) 3430 return false; 3431 3432 txqi = to_txq_info(txq); 3433 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3434 return false; 3435 3436 if (sta->sta.cur->max_rc_amsdu_len) 3437 max_amsdu_len = min_t(int, max_amsdu_len, 3438 sta->sta.cur->max_rc_amsdu_len); 3439 3440 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3441 max_amsdu_len = min_t(int, max_amsdu_len, 3442 sta->sta.cur->max_tid_amsdu_len[tid]); 3443 3444 flow_idx = fq_flow_idx(fq, skb); 3445 3446 spin_lock_bh(&fq->lock); 3447 3448 /* TODO: Ideally aggregation should be done on dequeue to remain 3449 * responsive to environment changes. 3450 */ 3451 3452 tin = &txqi->tin; 3453 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3454 head = skb_peek_tail(&flow->queue); 3455 if (!head || skb_is_gso(head)) 3456 goto out; 3457 3458 orig_truesize = head->truesize; 3459 orig_len = head->len; 3460 3461 if (skb->len + head->len > max_amsdu_len) 3462 goto out; 3463 3464 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3465 nfrags += 1 + skb_shinfo(head)->nr_frags; 3466 frag_tail = &skb_shinfo(head)->frag_list; 3467 while (*frag_tail) { 3468 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3469 frag_tail = &(*frag_tail)->next; 3470 n++; 3471 } 3472 3473 if (max_subframes && n > max_subframes) 3474 goto out; 3475 3476 if (max_frags && nfrags > max_frags) 3477 goto out; 3478 3479 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3480 goto out; 3481 3482 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3483 goto out; 3484 3485 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3486 * and frag_tail should be &skb_shinfo(head)->frag_list. 3487 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3488 * Reload frag_tail to have it pointing to the correct place. 3489 */ 3490 if (n == 2) 3491 frag_tail = &skb_shinfo(head)->frag_list; 3492 3493 /* 3494 * Pad out the previous subframe to a multiple of 4 by adding the 3495 * padding to the next one, that's being added. Note that head->len 3496 * is the length of the full A-MSDU, but that works since each time 3497 * we add a new subframe we pad out the previous one to a multiple 3498 * of 4 and thus it no longer matters in the next round. 3499 */ 3500 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3501 if ((head->len - hdrlen) & 3) 3502 pad = 4 - ((head->len - hdrlen) & 3); 3503 3504 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3505 2 + pad)) 3506 goto out_recalc; 3507 3508 ret = true; 3509 data = skb_push(skb, ETH_ALEN + 2); 3510 ether_addr_copy(data, da); 3511 ether_addr_copy(data + ETH_ALEN, sa); 3512 3513 data += 2 * ETH_ALEN; 3514 len = cpu_to_be16(subframe_len); 3515 memcpy(data, &len, 2); 3516 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3517 3518 memset(skb_push(skb, pad), 0, pad); 3519 3520 head->len += skb->len; 3521 head->data_len += skb->len; 3522 *frag_tail = skb; 3523 3524 out_recalc: 3525 fq->memory_usage += head->truesize - orig_truesize; 3526 if (head->len != orig_len) { 3527 flow->backlog += head->len - orig_len; 3528 tin->backlog_bytes += head->len - orig_len; 3529 } 3530 out: 3531 spin_unlock_bh(&fq->lock); 3532 3533 return ret; 3534 } 3535 3536 /* 3537 * Can be called while the sta lock is held. Anything that can cause packets to 3538 * be generated will cause deadlock! 3539 */ 3540 static ieee80211_tx_result 3541 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3542 struct sta_info *sta, u8 pn_offs, 3543 struct ieee80211_key *key, 3544 struct ieee80211_tx_data *tx) 3545 { 3546 struct sk_buff *skb = tx->skb; 3547 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3548 struct ieee80211_hdr *hdr = (void *)skb->data; 3549 u8 tid = IEEE80211_NUM_TIDS; 3550 3551 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3552 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3553 return TX_DROP; 3554 3555 if (key) 3556 info->control.hw_key = &key->conf; 3557 3558 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3559 3560 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3561 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3562 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3563 } else { 3564 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3565 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3566 sdata->sequence_number += 0x10; 3567 } 3568 3569 if (skb_shinfo(skb)->gso_size) 3570 sta->deflink.tx_stats.msdu[tid] += 3571 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3572 else 3573 sta->deflink.tx_stats.msdu[tid]++; 3574 3575 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3576 3577 /* statistics normally done by ieee80211_tx_h_stats (but that 3578 * has to consider fragmentation, so is more complex) 3579 */ 3580 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3581 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3582 3583 if (pn_offs) { 3584 u64 pn; 3585 u8 *crypto_hdr = skb->data + pn_offs; 3586 3587 switch (key->conf.cipher) { 3588 case WLAN_CIPHER_SUITE_CCMP: 3589 case WLAN_CIPHER_SUITE_CCMP_256: 3590 case WLAN_CIPHER_SUITE_GCMP: 3591 case WLAN_CIPHER_SUITE_GCMP_256: 3592 pn = atomic64_inc_return(&key->conf.tx_pn); 3593 crypto_hdr[0] = pn; 3594 crypto_hdr[1] = pn >> 8; 3595 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3596 crypto_hdr[4] = pn >> 16; 3597 crypto_hdr[5] = pn >> 24; 3598 crypto_hdr[6] = pn >> 32; 3599 crypto_hdr[7] = pn >> 40; 3600 break; 3601 } 3602 } 3603 3604 return TX_CONTINUE; 3605 } 3606 3607 static netdev_features_t 3608 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3609 { 3610 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3611 return sdata->vif.netdev_features; 3612 3613 if (!sdata->bss) 3614 return 0; 3615 3616 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3617 return sdata->vif.netdev_features; 3618 } 3619 3620 static struct sk_buff * 3621 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3622 { 3623 if (skb_is_gso(skb)) { 3624 struct sk_buff *segs; 3625 3626 segs = skb_gso_segment(skb, features); 3627 if (!segs) 3628 return skb; 3629 if (IS_ERR(segs)) 3630 goto free; 3631 3632 consume_skb(skb); 3633 return segs; 3634 } 3635 3636 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3637 goto free; 3638 3639 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3640 int ofs = skb_checksum_start_offset(skb); 3641 3642 if (skb->encapsulation) 3643 skb_set_inner_transport_header(skb, ofs); 3644 else 3645 skb_set_transport_header(skb, ofs); 3646 3647 if (skb_csum_hwoffload_help(skb, features)) 3648 goto free; 3649 } 3650 3651 skb_mark_not_on_list(skb); 3652 return skb; 3653 3654 free: 3655 kfree_skb(skb); 3656 return NULL; 3657 } 3658 3659 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3660 struct sta_info *sta, 3661 struct ieee80211_fast_tx *fast_tx, 3662 struct sk_buff *skb, bool ampdu, 3663 const u8 *da, const u8 *sa) 3664 { 3665 struct ieee80211_local *local = sdata->local; 3666 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3667 struct ieee80211_tx_info *info; 3668 struct ieee80211_tx_data tx; 3669 ieee80211_tx_result r; 3670 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3671 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3672 3673 skb = skb_share_check(skb, GFP_ATOMIC); 3674 if (unlikely(!skb)) 3675 return; 3676 3677 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3678 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3679 return; 3680 3681 /* will not be crypto-handled beyond what we do here, so use false 3682 * as the may-encrypt argument for the resize to not account for 3683 * more room than we already have in 'extra_head' 3684 */ 3685 if (unlikely(ieee80211_skb_resize(sdata, skb, 3686 max_t(int, extra_head + hw_headroom - 3687 skb_headroom(skb), 0), 3688 ENCRYPT_NO))) 3689 goto free; 3690 3691 hdr = skb_push(skb, extra_head); 3692 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3693 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3694 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3695 3696 info = IEEE80211_SKB_CB(skb); 3697 memset(info, 0, sizeof(*info)); 3698 info->band = fast_tx->band; 3699 info->control.vif = &sdata->vif; 3700 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3701 IEEE80211_TX_CTL_DONTFRAG; 3702 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3703 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3704 IEEE80211_TX_CTRL_MLO_LINK); 3705 3706 #ifdef CONFIG_MAC80211_DEBUGFS 3707 if (local->force_tx_status) 3708 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3709 #endif 3710 3711 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3712 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3713 3714 *ieee80211_get_qos_ctl(hdr) = tid; 3715 } 3716 3717 __skb_queue_head_init(&tx.skbs); 3718 3719 tx.flags = IEEE80211_TX_UNICAST; 3720 tx.local = local; 3721 tx.sdata = sdata; 3722 tx.sta = sta; 3723 tx.key = fast_tx->key; 3724 3725 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3726 return; 3727 3728 tx.skb = skb; 3729 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3730 fast_tx->key, &tx); 3731 tx.skb = NULL; 3732 if (r == TX_DROP) 3733 goto free; 3734 3735 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3736 sdata = container_of(sdata->bss, 3737 struct ieee80211_sub_if_data, u.ap); 3738 3739 __skb_queue_tail(&tx.skbs, skb); 3740 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3741 return; 3742 3743 free: 3744 kfree_skb(skb); 3745 } 3746 3747 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3748 struct sta_info *sta, 3749 struct ieee80211_fast_tx *fast_tx, 3750 struct sk_buff *skb) 3751 { 3752 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3753 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3754 struct tid_ampdu_tx *tid_tx = NULL; 3755 struct sk_buff *next; 3756 struct ethhdr eth; 3757 u8 tid = IEEE80211_NUM_TIDS; 3758 3759 /* control port protocol needs a lot of special handling */ 3760 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3761 return false; 3762 3763 /* only RFC 1042 SNAP */ 3764 if (ethertype < ETH_P_802_3_MIN) 3765 return false; 3766 3767 /* don't handle TX status request here either */ 3768 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3769 return false; 3770 3771 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3772 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3773 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3774 if (tid_tx) { 3775 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3776 return false; 3777 if (tid_tx->timeout) 3778 tid_tx->last_tx = jiffies; 3779 } 3780 } 3781 3782 memcpy(ð, skb->data, ETH_HLEN - 2); 3783 3784 /* after this point (skb is modified) we cannot return false */ 3785 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3786 if (!skb) 3787 return true; 3788 3789 skb_list_walk_safe(skb, skb, next) { 3790 skb_mark_not_on_list(skb); 3791 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3792 eth.h_dest, eth.h_source); 3793 } 3794 3795 return true; 3796 } 3797 3798 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3799 struct ieee80211_txq *txq) 3800 { 3801 struct ieee80211_local *local = hw_to_local(hw); 3802 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3803 struct ieee80211_hdr *hdr; 3804 struct sk_buff *skb = NULL; 3805 struct fq *fq = &local->fq; 3806 struct fq_tin *tin = &txqi->tin; 3807 struct ieee80211_tx_info *info; 3808 struct ieee80211_tx_data tx; 3809 ieee80211_tx_result r; 3810 struct ieee80211_vif *vif = txq->vif; 3811 int q = vif->hw_queue[txq->ac]; 3812 unsigned long flags; 3813 bool q_stopped; 3814 3815 WARN_ON_ONCE(softirq_count() == 0); 3816 3817 if (!ieee80211_txq_airtime_check(hw, txq)) 3818 return NULL; 3819 3820 begin: 3821 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3822 q_stopped = local->queue_stop_reasons[q]; 3823 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3824 3825 if (unlikely(q_stopped)) { 3826 /* mark for waking later */ 3827 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3828 return NULL; 3829 } 3830 3831 spin_lock_bh(&fq->lock); 3832 3833 /* Make sure fragments stay together. */ 3834 skb = __skb_dequeue(&txqi->frags); 3835 if (unlikely(skb)) { 3836 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3837 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3838 goto out; 3839 IEEE80211_SKB_CB(skb)->control.flags &= 3840 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3841 } else { 3842 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3843 goto out; 3844 3845 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3846 } 3847 3848 if (!skb) 3849 goto out; 3850 3851 spin_unlock_bh(&fq->lock); 3852 3853 hdr = (struct ieee80211_hdr *)skb->data; 3854 info = IEEE80211_SKB_CB(skb); 3855 3856 memset(&tx, 0, sizeof(tx)); 3857 __skb_queue_head_init(&tx.skbs); 3858 tx.local = local; 3859 tx.skb = skb; 3860 tx.sdata = vif_to_sdata(info->control.vif); 3861 3862 if (txq->sta) { 3863 tx.sta = container_of(txq->sta, struct sta_info, sta); 3864 /* 3865 * Drop unicast frames to unauthorised stations unless they are 3866 * injected frames or EAPOL frames from the local station. 3867 */ 3868 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3869 ieee80211_is_data(hdr->frame_control) && 3870 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3871 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3872 !is_multicast_ether_addr(hdr->addr1) && 3873 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3874 (!(info->control.flags & 3875 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3876 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3877 NULL)))) { 3878 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3879 ieee80211_free_txskb(&local->hw, skb); 3880 goto begin; 3881 } 3882 } 3883 3884 /* 3885 * The key can be removed while the packet was queued, so need to call 3886 * this here to get the current key. 3887 */ 3888 r = ieee80211_tx_h_select_key(&tx); 3889 if (r != TX_CONTINUE) { 3890 ieee80211_free_txskb(&local->hw, skb); 3891 goto begin; 3892 } 3893 3894 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3895 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3896 IEEE80211_TX_CTL_DONTFRAG); 3897 3898 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3899 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3900 r = ieee80211_tx_h_rate_ctrl(&tx); 3901 if (r != TX_CONTINUE) { 3902 ieee80211_free_txskb(&local->hw, skb); 3903 goto begin; 3904 } 3905 } 3906 goto encap_out; 3907 } 3908 3909 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3910 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3911 sta); 3912 u8 pn_offs = 0; 3913 3914 if (tx.key && 3915 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3916 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3917 3918 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3919 tx.key, &tx); 3920 if (r != TX_CONTINUE) { 3921 ieee80211_free_txskb(&local->hw, skb); 3922 goto begin; 3923 } 3924 } else { 3925 if (invoke_tx_handlers_late(&tx)) 3926 goto begin; 3927 3928 skb = __skb_dequeue(&tx.skbs); 3929 3930 if (!skb_queue_empty(&tx.skbs)) { 3931 spin_lock_bh(&fq->lock); 3932 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3933 spin_unlock_bh(&fq->lock); 3934 } 3935 } 3936 3937 if (skb_has_frag_list(skb) && 3938 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3939 if (skb_linearize(skb)) { 3940 ieee80211_free_txskb(&local->hw, skb); 3941 goto begin; 3942 } 3943 } 3944 3945 switch (tx.sdata->vif.type) { 3946 case NL80211_IFTYPE_MONITOR: 3947 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3948 vif = &tx.sdata->vif; 3949 break; 3950 } 3951 tx.sdata = rcu_dereference(local->monitor_sdata); 3952 if (tx.sdata) { 3953 vif = &tx.sdata->vif; 3954 info->hw_queue = 3955 vif->hw_queue[skb_get_queue_mapping(skb)]; 3956 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3957 ieee80211_free_txskb(&local->hw, skb); 3958 goto begin; 3959 } else { 3960 vif = NULL; 3961 } 3962 break; 3963 case NL80211_IFTYPE_AP_VLAN: 3964 tx.sdata = container_of(tx.sdata->bss, 3965 struct ieee80211_sub_if_data, u.ap); 3966 fallthrough; 3967 default: 3968 vif = &tx.sdata->vif; 3969 break; 3970 } 3971 3972 encap_out: 3973 IEEE80211_SKB_CB(skb)->control.vif = vif; 3974 3975 if (tx.sta && 3976 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3977 bool ampdu = txq->ac != IEEE80211_AC_VO; 3978 u32 airtime; 3979 3980 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3981 skb->len, ampdu); 3982 if (airtime) { 3983 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3984 ieee80211_sta_update_pending_airtime(local, tx.sta, 3985 txq->ac, 3986 airtime, 3987 false); 3988 } 3989 } 3990 3991 return skb; 3992 3993 out: 3994 spin_unlock_bh(&fq->lock); 3995 3996 return skb; 3997 } 3998 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3999 4000 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4001 { 4002 struct airtime_info *air_info = &sta->airtime[ac]; 4003 4004 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4005 } 4006 4007 static void 4008 ieee80211_txq_set_active(struct txq_info *txqi) 4009 { 4010 struct sta_info *sta; 4011 4012 if (!txqi->txq.sta) 4013 return; 4014 4015 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4016 sta->airtime[txqi->txq.ac].last_active = jiffies; 4017 } 4018 4019 static bool 4020 ieee80211_txq_keep_active(struct txq_info *txqi) 4021 { 4022 struct sta_info *sta; 4023 4024 if (!txqi->txq.sta) 4025 return false; 4026 4027 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4028 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4029 return false; 4030 4031 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4032 } 4033 4034 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4035 { 4036 struct ieee80211_local *local = hw_to_local(hw); 4037 struct ieee80211_txq *ret = NULL; 4038 struct txq_info *txqi = NULL, *head = NULL; 4039 bool found_eligible_txq = false; 4040 4041 spin_lock_bh(&local->active_txq_lock[ac]); 4042 4043 if (!local->schedule_round[ac]) 4044 goto out; 4045 4046 begin: 4047 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4048 struct txq_info, 4049 schedule_order); 4050 if (!txqi) 4051 goto out; 4052 4053 if (txqi == head) { 4054 if (!found_eligible_txq) 4055 goto out; 4056 else 4057 found_eligible_txq = false; 4058 } 4059 4060 if (!head) 4061 head = txqi; 4062 4063 if (txqi->txq.sta) { 4064 struct sta_info *sta = container_of(txqi->txq.sta, 4065 struct sta_info, sta); 4066 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4067 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4068 4069 if (aql_check) 4070 found_eligible_txq = true; 4071 4072 if (deficit < 0) 4073 sta->airtime[txqi->txq.ac].deficit += 4074 sta->airtime_weight; 4075 4076 if (deficit < 0 || !aql_check) { 4077 list_move_tail(&txqi->schedule_order, 4078 &local->active_txqs[txqi->txq.ac]); 4079 goto begin; 4080 } 4081 } 4082 4083 if (txqi->schedule_round == local->schedule_round[ac]) 4084 goto out; 4085 4086 list_del_init(&txqi->schedule_order); 4087 txqi->schedule_round = local->schedule_round[ac]; 4088 ret = &txqi->txq; 4089 4090 out: 4091 spin_unlock_bh(&local->active_txq_lock[ac]); 4092 return ret; 4093 } 4094 EXPORT_SYMBOL(ieee80211_next_txq); 4095 4096 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4097 struct ieee80211_txq *txq, 4098 bool force) 4099 { 4100 struct ieee80211_local *local = hw_to_local(hw); 4101 struct txq_info *txqi = to_txq_info(txq); 4102 bool has_queue; 4103 4104 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4105 4106 has_queue = force || txq_has_queue(txq); 4107 if (list_empty(&txqi->schedule_order) && 4108 (has_queue || ieee80211_txq_keep_active(txqi))) { 4109 /* If airtime accounting is active, always enqueue STAs at the 4110 * head of the list to ensure that they only get moved to the 4111 * back by the airtime DRR scheduler once they have a negative 4112 * deficit. A station that already has a negative deficit will 4113 * get immediately moved to the back of the list on the next 4114 * call to ieee80211_next_txq(). 4115 */ 4116 if (txqi->txq.sta && local->airtime_flags && has_queue && 4117 wiphy_ext_feature_isset(local->hw.wiphy, 4118 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4119 list_add(&txqi->schedule_order, 4120 &local->active_txqs[txq->ac]); 4121 else 4122 list_add_tail(&txqi->schedule_order, 4123 &local->active_txqs[txq->ac]); 4124 if (has_queue) 4125 ieee80211_txq_set_active(txqi); 4126 } 4127 4128 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4129 } 4130 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4131 4132 DEFINE_STATIC_KEY_FALSE(aql_disable); 4133 4134 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4135 struct ieee80211_txq *txq) 4136 { 4137 struct sta_info *sta; 4138 struct ieee80211_local *local = hw_to_local(hw); 4139 4140 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4141 return true; 4142 4143 if (static_branch_unlikely(&aql_disable)) 4144 return true; 4145 4146 if (!txq->sta) 4147 return true; 4148 4149 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4150 return true; 4151 4152 sta = container_of(txq->sta, struct sta_info, sta); 4153 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4154 sta->airtime[txq->ac].aql_limit_low) 4155 return true; 4156 4157 if (atomic_read(&local->aql_total_pending_airtime) < 4158 local->aql_threshold && 4159 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4160 sta->airtime[txq->ac].aql_limit_high) 4161 return true; 4162 4163 return false; 4164 } 4165 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4166 4167 static bool 4168 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4169 { 4170 unsigned int num_txq = 0; 4171 struct txq_info *txq; 4172 u32 aql_limit; 4173 4174 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4175 return true; 4176 4177 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4178 num_txq++; 4179 4180 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4181 local->aql_txq_limit_high[ac]; 4182 4183 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4184 } 4185 4186 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4187 struct ieee80211_txq *txq) 4188 { 4189 struct ieee80211_local *local = hw_to_local(hw); 4190 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4191 struct sta_info *sta; 4192 u8 ac = txq->ac; 4193 4194 spin_lock_bh(&local->active_txq_lock[ac]); 4195 4196 if (!txqi->txq.sta) 4197 goto out; 4198 4199 if (list_empty(&txqi->schedule_order)) 4200 goto out; 4201 4202 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4203 goto out; 4204 4205 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4206 schedule_order) { 4207 if (iter == txqi) 4208 break; 4209 4210 if (!iter->txq.sta) { 4211 list_move_tail(&iter->schedule_order, 4212 &local->active_txqs[ac]); 4213 continue; 4214 } 4215 sta = container_of(iter->txq.sta, struct sta_info, sta); 4216 if (ieee80211_sta_deficit(sta, ac) < 0) 4217 sta->airtime[ac].deficit += sta->airtime_weight; 4218 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4219 } 4220 4221 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4222 if (sta->airtime[ac].deficit >= 0) 4223 goto out; 4224 4225 sta->airtime[ac].deficit += sta->airtime_weight; 4226 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4227 spin_unlock_bh(&local->active_txq_lock[ac]); 4228 4229 return false; 4230 out: 4231 if (!list_empty(&txqi->schedule_order)) 4232 list_del_init(&txqi->schedule_order); 4233 spin_unlock_bh(&local->active_txq_lock[ac]); 4234 4235 return true; 4236 } 4237 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4238 4239 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4240 { 4241 struct ieee80211_local *local = hw_to_local(hw); 4242 4243 spin_lock_bh(&local->active_txq_lock[ac]); 4244 4245 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4246 local->schedule_round[ac]++; 4247 if (!local->schedule_round[ac]) 4248 local->schedule_round[ac]++; 4249 } else { 4250 local->schedule_round[ac] = 0; 4251 } 4252 4253 spin_unlock_bh(&local->active_txq_lock[ac]); 4254 } 4255 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4256 4257 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4258 struct net_device *dev, 4259 u32 info_flags, 4260 u32 ctrl_flags, 4261 u64 *cookie) 4262 { 4263 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4264 struct ieee80211_local *local = sdata->local; 4265 struct sta_info *sta; 4266 struct sk_buff *next; 4267 int len = skb->len; 4268 4269 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4270 kfree_skb(skb); 4271 return; 4272 } 4273 4274 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4275 4276 rcu_read_lock(); 4277 4278 if (ieee80211_vif_is_mesh(&sdata->vif) && 4279 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4280 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4281 goto out; 4282 4283 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4284 goto out_free; 4285 4286 if (IS_ERR(sta)) 4287 sta = NULL; 4288 4289 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4290 ieee80211_aggr_check(sdata, sta, skb); 4291 4292 if (sta) { 4293 struct ieee80211_fast_tx *fast_tx; 4294 4295 fast_tx = rcu_dereference(sta->fast_tx); 4296 4297 if (fast_tx && 4298 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4299 goto out; 4300 } 4301 4302 /* the frame could be fragmented, software-encrypted, and other 4303 * things so we cannot really handle checksum or GSO offload. 4304 * fix it up in software before we handle anything else. 4305 */ 4306 skb = ieee80211_tx_skb_fixup(skb, 0); 4307 if (!skb) { 4308 len = 0; 4309 goto out; 4310 } 4311 4312 skb_list_walk_safe(skb, skb, next) { 4313 skb_mark_not_on_list(skb); 4314 4315 if (skb->protocol == sdata->control_port_protocol) 4316 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4317 4318 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4319 sta, ctrl_flags, cookie); 4320 if (IS_ERR(skb)) { 4321 kfree_skb_list(next); 4322 goto out; 4323 } 4324 4325 dev_sw_netstats_tx_add(dev, 1, skb->len); 4326 4327 ieee80211_xmit(sdata, sta, skb); 4328 } 4329 goto out; 4330 out_free: 4331 kfree_skb(skb); 4332 len = 0; 4333 out: 4334 if (len) 4335 ieee80211_tpt_led_trig_tx(local, len); 4336 rcu_read_unlock(); 4337 } 4338 4339 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4340 { 4341 struct ethhdr *eth; 4342 int err; 4343 4344 err = skb_ensure_writable(skb, ETH_HLEN); 4345 if (unlikely(err)) 4346 return err; 4347 4348 eth = (void *)skb->data; 4349 ether_addr_copy(eth->h_dest, sta->sta.addr); 4350 4351 return 0; 4352 } 4353 4354 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4355 struct net_device *dev) 4356 { 4357 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4358 const struct ethhdr *eth = (void *)skb->data; 4359 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4360 __be16 ethertype; 4361 4362 switch (sdata->vif.type) { 4363 case NL80211_IFTYPE_AP_VLAN: 4364 if (sdata->u.vlan.sta) 4365 return false; 4366 if (sdata->wdev.use_4addr) 4367 return false; 4368 fallthrough; 4369 case NL80211_IFTYPE_AP: 4370 /* check runtime toggle for this bss */ 4371 if (!sdata->bss->multicast_to_unicast) 4372 return false; 4373 break; 4374 default: 4375 return false; 4376 } 4377 4378 /* multicast to unicast conversion only for some payload */ 4379 ethertype = eth->h_proto; 4380 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4381 ethertype = ethvlan->h_vlan_encapsulated_proto; 4382 switch (ethertype) { 4383 case htons(ETH_P_ARP): 4384 case htons(ETH_P_IP): 4385 case htons(ETH_P_IPV6): 4386 break; 4387 default: 4388 return false; 4389 } 4390 4391 return true; 4392 } 4393 4394 static void 4395 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4396 struct sk_buff_head *queue) 4397 { 4398 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4399 struct ieee80211_local *local = sdata->local; 4400 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4401 struct sta_info *sta, *first = NULL; 4402 struct sk_buff *cloned_skb; 4403 4404 rcu_read_lock(); 4405 4406 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4407 if (sdata != sta->sdata) 4408 /* AP-VLAN mismatch */ 4409 continue; 4410 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4411 /* do not send back to source */ 4412 continue; 4413 if (!first) { 4414 first = sta; 4415 continue; 4416 } 4417 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4418 if (!cloned_skb) 4419 goto multicast; 4420 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4421 dev_kfree_skb(cloned_skb); 4422 goto multicast; 4423 } 4424 __skb_queue_tail(queue, cloned_skb); 4425 } 4426 4427 if (likely(first)) { 4428 if (unlikely(ieee80211_change_da(skb, first))) 4429 goto multicast; 4430 __skb_queue_tail(queue, skb); 4431 } else { 4432 /* no STA connected, drop */ 4433 kfree_skb(skb); 4434 skb = NULL; 4435 } 4436 4437 goto out; 4438 multicast: 4439 __skb_queue_purge(queue); 4440 __skb_queue_tail(queue, skb); 4441 out: 4442 rcu_read_unlock(); 4443 } 4444 4445 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4446 struct sk_buff *skb, u32 ctrl_flags, 4447 unsigned int link_id) 4448 { 4449 struct sk_buff *out; 4450 4451 out = skb_copy(skb, GFP_ATOMIC); 4452 if (!out) 4453 return; 4454 4455 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4456 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4457 } 4458 4459 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4460 struct sk_buff *skb) 4461 { 4462 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4463 unsigned long links = sdata->vif.active_links; 4464 unsigned int link; 4465 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4466 4467 if (hweight16(links) == 1) { 4468 ctrl_flags |= u32_encode_bits(__ffs(links), 4469 IEEE80211_TX_CTRL_MLO_LINK); 4470 4471 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4472 NULL); 4473 return; 4474 } 4475 4476 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4477 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4478 ctrl_flags = 0; 4479 } 4480 kfree_skb(skb); 4481 } 4482 4483 /** 4484 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4485 * @skb: packet to be sent 4486 * @dev: incoming interface 4487 * 4488 * On failure skb will be freed. 4489 * 4490 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4491 */ 4492 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4493 struct net_device *dev) 4494 { 4495 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4496 const struct ethhdr *eth = (void *)skb->data; 4497 4498 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4499 goto normal; 4500 4501 if (unlikely(!ieee80211_sdata_running(sdata))) { 4502 kfree_skb(skb); 4503 return NETDEV_TX_OK; 4504 } 4505 4506 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4507 struct sk_buff_head queue; 4508 4509 __skb_queue_head_init(&queue); 4510 ieee80211_convert_to_unicast(skb, dev, &queue); 4511 while ((skb = __skb_dequeue(&queue))) 4512 __ieee80211_subif_start_xmit(skb, dev, 0, 4513 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4514 NULL); 4515 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4516 sdata->vif.type == NL80211_IFTYPE_AP && 4517 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4518 ieee80211_mlo_multicast_tx(dev, skb); 4519 } else { 4520 normal: 4521 __ieee80211_subif_start_xmit(skb, dev, 0, 4522 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4523 NULL); 4524 } 4525 4526 return NETDEV_TX_OK; 4527 } 4528 4529 4530 4531 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4532 struct sk_buff *skb, struct sta_info *sta, 4533 bool txpending) 4534 { 4535 struct ieee80211_local *local = sdata->local; 4536 struct ieee80211_tx_control control = {}; 4537 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4538 struct ieee80211_sta *pubsta = NULL; 4539 unsigned long flags; 4540 int q = info->hw_queue; 4541 4542 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4543 4544 if (local->queue_stop_reasons[q] || 4545 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4546 if (txpending) 4547 skb_queue_head(&local->pending[q], skb); 4548 else 4549 skb_queue_tail(&local->pending[q], skb); 4550 4551 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4552 4553 return false; 4554 } 4555 4556 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4557 4558 if (sta && sta->uploaded) 4559 pubsta = &sta->sta; 4560 4561 control.sta = pubsta; 4562 4563 drv_tx(local, &control, skb); 4564 4565 return true; 4566 } 4567 4568 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4569 struct sk_buff *skb, struct sta_info *sta, 4570 bool txpending) 4571 { 4572 struct ieee80211_local *local = sdata->local; 4573 struct sk_buff *next; 4574 bool ret = true; 4575 4576 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4577 return true; 4578 4579 skb_list_walk_safe(skb, skb, next) { 4580 skb_mark_not_on_list(skb); 4581 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4582 ret = false; 4583 } 4584 4585 return ret; 4586 } 4587 4588 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4589 struct net_device *dev, struct sta_info *sta, 4590 struct ieee80211_key *key, struct sk_buff *skb) 4591 { 4592 struct ieee80211_tx_info *info; 4593 struct ieee80211_local *local = sdata->local; 4594 struct tid_ampdu_tx *tid_tx; 4595 struct sk_buff *seg, *next; 4596 unsigned int skbs = 0, len = 0; 4597 u16 queue; 4598 u8 tid; 4599 4600 queue = ieee80211_select_queue(sdata, sta, skb); 4601 skb_set_queue_mapping(skb, queue); 4602 4603 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4604 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4605 goto out_free; 4606 4607 skb = skb_share_check(skb, GFP_ATOMIC); 4608 if (unlikely(!skb)) 4609 return; 4610 4611 ieee80211_aggr_check(sdata, sta, skb); 4612 4613 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4614 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4615 if (tid_tx) { 4616 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4617 /* fall back to non-offload slow path */ 4618 __ieee80211_subif_start_xmit(skb, dev, 0, 4619 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4620 NULL); 4621 return; 4622 } 4623 4624 if (tid_tx->timeout) 4625 tid_tx->last_tx = jiffies; 4626 } 4627 4628 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4629 if (!skb) 4630 return; 4631 4632 info = IEEE80211_SKB_CB(skb); 4633 memset(info, 0, sizeof(*info)); 4634 4635 info->hw_queue = sdata->vif.hw_queue[queue]; 4636 4637 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4638 sdata = container_of(sdata->bss, 4639 struct ieee80211_sub_if_data, u.ap); 4640 4641 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4642 info->control.vif = &sdata->vif; 4643 4644 if (key) 4645 info->control.hw_key = &key->conf; 4646 4647 skb_list_walk_safe(skb, seg, next) { 4648 skbs++; 4649 len += seg->len; 4650 if (seg != skb) 4651 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4652 } 4653 4654 if (unlikely(skb->sk && 4655 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 4656 info->status_data = ieee80211_store_ack_skb(local, skb, 4657 &info->flags, NULL); 4658 if (info->status_data) 4659 info->status_data_idr = 1; 4660 } 4661 4662 dev_sw_netstats_tx_add(dev, skbs, len); 4663 sta->deflink.tx_stats.packets[queue] += skbs; 4664 sta->deflink.tx_stats.bytes[queue] += len; 4665 4666 ieee80211_tpt_led_trig_tx(local, len); 4667 4668 ieee80211_tx_8023(sdata, skb, sta, false); 4669 4670 return; 4671 4672 out_free: 4673 kfree_skb(skb); 4674 } 4675 4676 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4677 struct net_device *dev) 4678 { 4679 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4680 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4681 struct ieee80211_key *key; 4682 struct sta_info *sta; 4683 4684 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4685 kfree_skb(skb); 4686 return NETDEV_TX_OK; 4687 } 4688 4689 rcu_read_lock(); 4690 4691 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4692 kfree_skb(skb); 4693 goto out; 4694 } 4695 4696 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4697 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4698 sdata->control_port_protocol == ehdr->h_proto)) 4699 goto skip_offload; 4700 4701 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4702 if (!key) 4703 key = rcu_dereference(sdata->default_unicast_key); 4704 4705 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4706 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4707 goto skip_offload; 4708 4709 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4710 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4711 goto out; 4712 4713 skip_offload: 4714 ieee80211_subif_start_xmit(skb, dev); 4715 out: 4716 rcu_read_unlock(); 4717 4718 return NETDEV_TX_OK; 4719 } 4720 4721 struct sk_buff * 4722 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4723 struct sk_buff *skb, u32 info_flags) 4724 { 4725 struct ieee80211_hdr *hdr; 4726 struct ieee80211_tx_data tx = { 4727 .local = sdata->local, 4728 .sdata = sdata, 4729 }; 4730 struct sta_info *sta; 4731 4732 rcu_read_lock(); 4733 4734 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4735 kfree_skb(skb); 4736 skb = ERR_PTR(-EINVAL); 4737 goto out; 4738 } 4739 4740 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4741 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4742 if (IS_ERR(skb)) 4743 goto out; 4744 4745 hdr = (void *)skb->data; 4746 tx.sta = sta_info_get(sdata, hdr->addr1); 4747 tx.skb = skb; 4748 4749 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4750 rcu_read_unlock(); 4751 kfree_skb(skb); 4752 return ERR_PTR(-EINVAL); 4753 } 4754 4755 out: 4756 rcu_read_unlock(); 4757 return skb; 4758 } 4759 4760 /* 4761 * ieee80211_clear_tx_pending may not be called in a context where 4762 * it is possible that it packets could come in again. 4763 */ 4764 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4765 { 4766 struct sk_buff *skb; 4767 int i; 4768 4769 for (i = 0; i < local->hw.queues; i++) { 4770 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4771 ieee80211_free_txskb(&local->hw, skb); 4772 } 4773 } 4774 4775 /* 4776 * Returns false if the frame couldn't be transmitted but was queued instead, 4777 * which in this case means re-queued -- take as an indication to stop sending 4778 * more pending frames. 4779 */ 4780 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4781 struct sk_buff *skb) 4782 { 4783 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4784 struct ieee80211_sub_if_data *sdata; 4785 struct sta_info *sta; 4786 struct ieee80211_hdr *hdr; 4787 bool result; 4788 struct ieee80211_chanctx_conf *chanctx_conf; 4789 4790 sdata = vif_to_sdata(info->control.vif); 4791 4792 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4793 /* update band only for non-MLD */ 4794 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4795 chanctx_conf = 4796 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4797 if (unlikely(!chanctx_conf)) { 4798 dev_kfree_skb(skb); 4799 return true; 4800 } 4801 info->band = chanctx_conf->def.chan->band; 4802 } 4803 result = ieee80211_tx(sdata, NULL, skb, true); 4804 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4805 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4806 dev_kfree_skb(skb); 4807 return true; 4808 } 4809 4810 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4811 sta = NULL; 4812 4813 result = ieee80211_tx_8023(sdata, skb, sta, true); 4814 } else { 4815 struct sk_buff_head skbs; 4816 4817 __skb_queue_head_init(&skbs); 4818 __skb_queue_tail(&skbs, skb); 4819 4820 hdr = (struct ieee80211_hdr *)skb->data; 4821 sta = sta_info_get(sdata, hdr->addr1); 4822 4823 result = __ieee80211_tx(local, &skbs, sta, true); 4824 } 4825 4826 return result; 4827 } 4828 4829 /* 4830 * Transmit all pending packets. Called from tasklet. 4831 */ 4832 void ieee80211_tx_pending(struct tasklet_struct *t) 4833 { 4834 struct ieee80211_local *local = from_tasklet(local, t, 4835 tx_pending_tasklet); 4836 unsigned long flags; 4837 int i; 4838 bool txok; 4839 4840 rcu_read_lock(); 4841 4842 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4843 for (i = 0; i < local->hw.queues; i++) { 4844 /* 4845 * If queue is stopped by something other than due to pending 4846 * frames, or we have no pending frames, proceed to next queue. 4847 */ 4848 if (local->queue_stop_reasons[i] || 4849 skb_queue_empty(&local->pending[i])) 4850 continue; 4851 4852 while (!skb_queue_empty(&local->pending[i])) { 4853 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4854 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4855 4856 if (WARN_ON(!info->control.vif)) { 4857 ieee80211_free_txskb(&local->hw, skb); 4858 continue; 4859 } 4860 4861 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4862 flags); 4863 4864 txok = ieee80211_tx_pending_skb(local, skb); 4865 spin_lock_irqsave(&local->queue_stop_reason_lock, 4866 flags); 4867 if (!txok) 4868 break; 4869 } 4870 } 4871 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4872 4873 rcu_read_unlock(); 4874 } 4875 4876 /* functions for drivers to get certain frames */ 4877 4878 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4879 struct ieee80211_link_data *link, 4880 struct ps_data *ps, struct sk_buff *skb, 4881 bool is_template) 4882 { 4883 u8 *pos, *tim; 4884 int aid0 = 0; 4885 int i, have_bits = 0, n1, n2; 4886 struct ieee80211_bss_conf *link_conf = link->conf; 4887 4888 /* Generate bitmap for TIM only if there are any STAs in power save 4889 * mode. */ 4890 if (atomic_read(&ps->num_sta_ps) > 0) 4891 /* in the hope that this is faster than 4892 * checking byte-for-byte */ 4893 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4894 IEEE80211_MAX_AID+1); 4895 if (!is_template) { 4896 if (ps->dtim_count == 0) 4897 ps->dtim_count = link_conf->dtim_period - 1; 4898 else 4899 ps->dtim_count--; 4900 } 4901 4902 tim = pos = skb_put(skb, 5); 4903 *pos++ = WLAN_EID_TIM; 4904 *pos++ = 3; 4905 *pos++ = ps->dtim_count; 4906 *pos++ = link_conf->dtim_period; 4907 4908 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4909 aid0 = 1; 4910 4911 ps->dtim_bc_mc = aid0 == 1; 4912 4913 if (have_bits) { 4914 /* Find largest even number N1 so that bits numbered 1 through 4915 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4916 * (N2 + 1) x 8 through 2007 are 0. */ 4917 n1 = 0; 4918 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4919 if (ps->tim[i]) { 4920 n1 = i & 0xfe; 4921 break; 4922 } 4923 } 4924 n2 = n1; 4925 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4926 if (ps->tim[i]) { 4927 n2 = i; 4928 break; 4929 } 4930 } 4931 4932 /* Bitmap control */ 4933 *pos++ = n1 | aid0; 4934 /* Part Virt Bitmap */ 4935 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4936 4937 tim[1] = n2 - n1 + 4; 4938 } else { 4939 *pos++ = aid0; /* Bitmap control */ 4940 4941 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4942 tim[1] = 4; 4943 /* Part Virt Bitmap */ 4944 skb_put_u8(skb, 0); 4945 } 4946 } 4947 } 4948 4949 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4950 struct ieee80211_link_data *link, 4951 struct ps_data *ps, struct sk_buff *skb, 4952 bool is_template) 4953 { 4954 struct ieee80211_local *local = sdata->local; 4955 4956 /* 4957 * Not very nice, but we want to allow the driver to call 4958 * ieee80211_beacon_get() as a response to the set_tim() 4959 * callback. That, however, is already invoked under the 4960 * sta_lock to guarantee consistent and race-free update 4961 * of the tim bitmap in mac80211 and the driver. 4962 */ 4963 if (local->tim_in_locked_section) { 4964 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4965 } else { 4966 spin_lock_bh(&local->tim_lock); 4967 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4968 spin_unlock_bh(&local->tim_lock); 4969 } 4970 4971 return 0; 4972 } 4973 4974 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4975 struct beacon_data *beacon, 4976 struct ieee80211_link_data *link) 4977 { 4978 u8 *beacon_data, count, max_count = 1; 4979 struct probe_resp *resp; 4980 size_t beacon_data_len; 4981 u16 *bcn_offsets; 4982 int i; 4983 4984 switch (sdata->vif.type) { 4985 case NL80211_IFTYPE_AP: 4986 beacon_data = beacon->tail; 4987 beacon_data_len = beacon->tail_len; 4988 break; 4989 case NL80211_IFTYPE_ADHOC: 4990 beacon_data = beacon->head; 4991 beacon_data_len = beacon->head_len; 4992 break; 4993 case NL80211_IFTYPE_MESH_POINT: 4994 beacon_data = beacon->head; 4995 beacon_data_len = beacon->head_len; 4996 break; 4997 default: 4998 return; 4999 } 5000 5001 resp = rcu_dereference(link->u.ap.probe_resp); 5002 5003 bcn_offsets = beacon->cntdwn_counter_offsets; 5004 count = beacon->cntdwn_current_counter; 5005 if (link->conf->csa_active) 5006 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5007 5008 for (i = 0; i < max_count; ++i) { 5009 if (bcn_offsets[i]) { 5010 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5011 return; 5012 beacon_data[bcn_offsets[i]] = count; 5013 } 5014 5015 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5016 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5017 5018 resp->data[resp_offsets[i]] = count; 5019 } 5020 } 5021 } 5022 5023 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 5024 { 5025 beacon->cntdwn_current_counter--; 5026 5027 /* the counter should never reach 0 */ 5028 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 5029 5030 return beacon->cntdwn_current_counter; 5031 } 5032 5033 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 5034 { 5035 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5036 struct beacon_data *beacon = NULL; 5037 u8 count = 0; 5038 5039 rcu_read_lock(); 5040 5041 if (sdata->vif.type == NL80211_IFTYPE_AP) 5042 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5043 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5044 beacon = rcu_dereference(sdata->u.ibss.presp); 5045 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5046 beacon = rcu_dereference(sdata->u.mesh.beacon); 5047 5048 if (!beacon) 5049 goto unlock; 5050 5051 count = __ieee80211_beacon_update_cntdwn(beacon); 5052 5053 unlock: 5054 rcu_read_unlock(); 5055 return count; 5056 } 5057 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5058 5059 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5060 { 5061 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5062 struct beacon_data *beacon = NULL; 5063 5064 rcu_read_lock(); 5065 5066 if (sdata->vif.type == NL80211_IFTYPE_AP) 5067 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5068 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5069 beacon = rcu_dereference(sdata->u.ibss.presp); 5070 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5071 beacon = rcu_dereference(sdata->u.mesh.beacon); 5072 5073 if (!beacon) 5074 goto unlock; 5075 5076 if (counter < beacon->cntdwn_current_counter) 5077 beacon->cntdwn_current_counter = counter; 5078 5079 unlock: 5080 rcu_read_unlock(); 5081 } 5082 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5083 5084 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 5085 { 5086 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5087 struct beacon_data *beacon = NULL; 5088 u8 *beacon_data; 5089 size_t beacon_data_len; 5090 int ret = false; 5091 5092 if (!ieee80211_sdata_running(sdata)) 5093 return false; 5094 5095 rcu_read_lock(); 5096 if (vif->type == NL80211_IFTYPE_AP) { 5097 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5098 if (WARN_ON(!beacon || !beacon->tail)) 5099 goto out; 5100 beacon_data = beacon->tail; 5101 beacon_data_len = beacon->tail_len; 5102 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5103 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5104 5105 beacon = rcu_dereference(ifibss->presp); 5106 if (!beacon) 5107 goto out; 5108 5109 beacon_data = beacon->head; 5110 beacon_data_len = beacon->head_len; 5111 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5112 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5113 5114 beacon = rcu_dereference(ifmsh->beacon); 5115 if (!beacon) 5116 goto out; 5117 5118 beacon_data = beacon->head; 5119 beacon_data_len = beacon->head_len; 5120 } else { 5121 WARN_ON(1); 5122 goto out; 5123 } 5124 5125 if (!beacon->cntdwn_counter_offsets[0]) 5126 goto out; 5127 5128 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5129 goto out; 5130 5131 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5132 ret = true; 5133 5134 out: 5135 rcu_read_unlock(); 5136 5137 return ret; 5138 } 5139 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5140 5141 static int ieee80211_beacon_protect(struct sk_buff *skb, 5142 struct ieee80211_local *local, 5143 struct ieee80211_sub_if_data *sdata, 5144 struct ieee80211_link_data *link) 5145 { 5146 ieee80211_tx_result res; 5147 struct ieee80211_tx_data tx; 5148 struct sk_buff *check_skb; 5149 5150 memset(&tx, 0, sizeof(tx)); 5151 tx.key = rcu_dereference(link->default_beacon_key); 5152 if (!tx.key) 5153 return 0; 5154 5155 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5156 tx.key = NULL; 5157 return -EINVAL; 5158 } 5159 5160 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5161 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5162 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5163 5164 tx.local = local; 5165 tx.sdata = sdata; 5166 __skb_queue_head_init(&tx.skbs); 5167 __skb_queue_tail(&tx.skbs, skb); 5168 res = ieee80211_tx_h_encrypt(&tx); 5169 check_skb = __skb_dequeue(&tx.skbs); 5170 /* we may crash after this, but it'd be a bug in crypto */ 5171 WARN_ON(check_skb != skb); 5172 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5173 return -EINVAL; 5174 5175 return 0; 5176 } 5177 5178 static void 5179 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5180 struct ieee80211_vif *vif, 5181 struct ieee80211_link_data *link, 5182 struct ieee80211_mutable_offsets *offs, 5183 struct beacon_data *beacon, 5184 struct sk_buff *skb, 5185 struct ieee80211_chanctx_conf *chanctx_conf, 5186 u16 csa_off_base) 5187 { 5188 struct ieee80211_local *local = hw_to_local(hw); 5189 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5190 struct ieee80211_tx_info *info; 5191 enum nl80211_band band; 5192 struct ieee80211_tx_rate_control txrc; 5193 5194 /* CSA offsets */ 5195 if (offs && beacon) { 5196 u16 i; 5197 5198 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5199 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5200 5201 if (!csa_off) 5202 continue; 5203 5204 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5205 } 5206 } 5207 5208 band = chanctx_conf->def.chan->band; 5209 info = IEEE80211_SKB_CB(skb); 5210 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5211 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5212 info->band = band; 5213 5214 memset(&txrc, 0, sizeof(txrc)); 5215 txrc.hw = hw; 5216 txrc.sband = local->hw.wiphy->bands[band]; 5217 txrc.bss_conf = link->conf; 5218 txrc.skb = skb; 5219 txrc.reported_rate.idx = -1; 5220 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5221 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5222 else 5223 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5224 txrc.bss = true; 5225 rate_control_get_rate(sdata, NULL, &txrc); 5226 5227 info->control.vif = vif; 5228 info->control.flags |= u32_encode_bits(link->link_id, 5229 IEEE80211_TX_CTRL_MLO_LINK); 5230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5231 IEEE80211_TX_CTL_ASSIGN_SEQ | 5232 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5233 } 5234 5235 static void 5236 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5237 u8 i) 5238 { 5239 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5240 i > beacon->mbssid_ies->cnt) 5241 return; 5242 5243 if (i < beacon->mbssid_ies->cnt) { 5244 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5245 beacon->mbssid_ies->elem[i].len); 5246 5247 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5248 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5249 beacon->rnr_ies->elem[i].len); 5250 5251 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5252 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5253 beacon->rnr_ies->elem[i].len); 5254 } 5255 return; 5256 } 5257 5258 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5259 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5260 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5261 beacon->mbssid_ies->elem[i].len); 5262 } 5263 5264 static struct sk_buff * 5265 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5266 struct ieee80211_vif *vif, 5267 struct ieee80211_link_data *link, 5268 struct ieee80211_mutable_offsets *offs, 5269 bool is_template, 5270 struct beacon_data *beacon, 5271 struct ieee80211_chanctx_conf *chanctx_conf, 5272 u8 ema_index) 5273 { 5274 struct ieee80211_local *local = hw_to_local(hw); 5275 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5276 struct ieee80211_if_ap *ap = &sdata->u.ap; 5277 struct sk_buff *skb = NULL; 5278 u16 csa_off_base = 0; 5279 int mbssid_len; 5280 5281 if (beacon->cntdwn_counter_offsets[0]) { 5282 if (!is_template) 5283 ieee80211_beacon_update_cntdwn(vif); 5284 5285 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5286 } 5287 5288 /* headroom, head length, 5289 * tail length, maximum TIM length and multiple BSSID length 5290 */ 5291 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5292 beacon->rnr_ies, 5293 ema_index); 5294 5295 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5296 beacon->tail_len + 256 + 5297 local->hw.extra_beacon_tailroom + mbssid_len); 5298 if (!skb) 5299 return NULL; 5300 5301 skb_reserve(skb, local->tx_headroom); 5302 skb_put_data(skb, beacon->head, beacon->head_len); 5303 5304 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5305 5306 if (offs) { 5307 offs->tim_offset = beacon->head_len; 5308 offs->tim_length = skb->len - beacon->head_len; 5309 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5310 5311 if (mbssid_len) { 5312 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5313 offs->mbssid_off = skb->len - mbssid_len; 5314 } 5315 5316 /* for AP the csa offsets are from tail */ 5317 csa_off_base = skb->len; 5318 } 5319 5320 if (beacon->tail) 5321 skb_put_data(skb, beacon->tail, beacon->tail_len); 5322 5323 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5324 return NULL; 5325 5326 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5327 chanctx_conf, csa_off_base); 5328 return skb; 5329 } 5330 5331 static struct ieee80211_ema_beacons * 5332 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5333 struct ieee80211_vif *vif, 5334 struct ieee80211_link_data *link, 5335 struct ieee80211_mutable_offsets *offs, 5336 bool is_template, struct beacon_data *beacon, 5337 struct ieee80211_chanctx_conf *chanctx_conf) 5338 { 5339 struct ieee80211_ema_beacons *ema = NULL; 5340 5341 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5342 return NULL; 5343 5344 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5345 GFP_ATOMIC); 5346 if (!ema) 5347 return NULL; 5348 5349 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5350 ema->bcn[ema->cnt].skb = 5351 ieee80211_beacon_get_ap(hw, vif, link, 5352 &ema->bcn[ema->cnt].offs, 5353 is_template, beacon, 5354 chanctx_conf, ema->cnt); 5355 if (!ema->bcn[ema->cnt].skb) 5356 break; 5357 } 5358 5359 if (ema->cnt == beacon->mbssid_ies->cnt) 5360 return ema; 5361 5362 ieee80211_beacon_free_ema_list(ema); 5363 return NULL; 5364 } 5365 5366 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5367 5368 static struct sk_buff * 5369 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5370 struct ieee80211_vif *vif, 5371 struct ieee80211_mutable_offsets *offs, 5372 bool is_template, 5373 unsigned int link_id, 5374 int ema_index, 5375 struct ieee80211_ema_beacons **ema_beacons) 5376 { 5377 struct ieee80211_local *local = hw_to_local(hw); 5378 struct beacon_data *beacon = NULL; 5379 struct sk_buff *skb = NULL; 5380 struct ieee80211_sub_if_data *sdata = NULL; 5381 struct ieee80211_chanctx_conf *chanctx_conf; 5382 struct ieee80211_link_data *link; 5383 5384 rcu_read_lock(); 5385 5386 sdata = vif_to_sdata(vif); 5387 link = rcu_dereference(sdata->link[link_id]); 5388 if (!link) 5389 goto out; 5390 chanctx_conf = 5391 rcu_dereference(link->conf->chanctx_conf); 5392 5393 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5394 goto out; 5395 5396 if (offs) 5397 memset(offs, 0, sizeof(*offs)); 5398 5399 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5400 beacon = rcu_dereference(link->u.ap.beacon); 5401 if (!beacon) 5402 goto out; 5403 5404 if (ema_beacons) { 5405 *ema_beacons = 5406 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5407 offs, 5408 is_template, 5409 beacon, 5410 chanctx_conf); 5411 } else { 5412 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5413 if (ema_index >= beacon->mbssid_ies->cnt) 5414 goto out; /* End of MBSSID elements */ 5415 5416 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5417 ema_index = beacon->mbssid_ies->cnt; 5418 } else { 5419 ema_index = 0; 5420 } 5421 5422 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5423 is_template, beacon, 5424 chanctx_conf, 5425 ema_index); 5426 } 5427 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5428 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5429 struct ieee80211_hdr *hdr; 5430 5431 beacon = rcu_dereference(ifibss->presp); 5432 if (!beacon) 5433 goto out; 5434 5435 if (beacon->cntdwn_counter_offsets[0]) { 5436 if (!is_template) 5437 __ieee80211_beacon_update_cntdwn(beacon); 5438 5439 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5440 } 5441 5442 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5443 local->hw.extra_beacon_tailroom); 5444 if (!skb) 5445 goto out; 5446 skb_reserve(skb, local->tx_headroom); 5447 skb_put_data(skb, beacon->head, beacon->head_len); 5448 5449 hdr = (struct ieee80211_hdr *) skb->data; 5450 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5451 IEEE80211_STYPE_BEACON); 5452 5453 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5454 chanctx_conf, 0); 5455 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5456 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5457 5458 beacon = rcu_dereference(ifmsh->beacon); 5459 if (!beacon) 5460 goto out; 5461 5462 if (beacon->cntdwn_counter_offsets[0]) { 5463 if (!is_template) 5464 /* TODO: For mesh csa_counter is in TU, so 5465 * decrementing it by one isn't correct, but 5466 * for now we leave it consistent with overall 5467 * mac80211's behavior. 5468 */ 5469 __ieee80211_beacon_update_cntdwn(beacon); 5470 5471 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5472 } 5473 5474 if (ifmsh->sync_ops) 5475 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5476 5477 skb = dev_alloc_skb(local->tx_headroom + 5478 beacon->head_len + 5479 256 + /* TIM IE */ 5480 beacon->tail_len + 5481 local->hw.extra_beacon_tailroom); 5482 if (!skb) 5483 goto out; 5484 skb_reserve(skb, local->tx_headroom); 5485 skb_put_data(skb, beacon->head, beacon->head_len); 5486 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5487 is_template); 5488 5489 if (offs) { 5490 offs->tim_offset = beacon->head_len; 5491 offs->tim_length = skb->len - beacon->head_len; 5492 } 5493 5494 skb_put_data(skb, beacon->tail, beacon->tail_len); 5495 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5496 chanctx_conf, 0); 5497 } else { 5498 WARN_ON(1); 5499 goto out; 5500 } 5501 5502 out: 5503 rcu_read_unlock(); 5504 return skb; 5505 5506 } 5507 5508 struct sk_buff * 5509 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5510 struct ieee80211_vif *vif, 5511 struct ieee80211_mutable_offsets *offs, 5512 unsigned int link_id) 5513 { 5514 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5515 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5516 } 5517 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5518 5519 struct sk_buff * 5520 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5521 struct ieee80211_vif *vif, 5522 struct ieee80211_mutable_offsets *offs, 5523 unsigned int link_id, u8 ema_index) 5524 { 5525 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5526 NULL); 5527 } 5528 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5529 5530 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5531 { 5532 u8 i; 5533 5534 if (!ema_beacons) 5535 return; 5536 5537 for (i = 0; i < ema_beacons->cnt; i++) 5538 kfree_skb(ema_beacons->bcn[i].skb); 5539 5540 kfree(ema_beacons); 5541 } 5542 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5543 5544 struct ieee80211_ema_beacons * 5545 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5546 struct ieee80211_vif *vif, 5547 unsigned int link_id) 5548 { 5549 struct ieee80211_ema_beacons *ema_beacons = NULL; 5550 5551 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5552 &ema_beacons)); 5553 5554 return ema_beacons; 5555 } 5556 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5557 5558 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5559 struct ieee80211_vif *vif, 5560 u16 *tim_offset, u16 *tim_length, 5561 unsigned int link_id) 5562 { 5563 struct ieee80211_mutable_offsets offs = {}; 5564 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5565 link_id, 5566 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5567 NULL); 5568 struct sk_buff *copy; 5569 5570 if (!bcn) 5571 return bcn; 5572 5573 if (tim_offset) 5574 *tim_offset = offs.tim_offset; 5575 5576 if (tim_length) 5577 *tim_length = offs.tim_length; 5578 5579 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5580 !hw_to_local(hw)->monitors) 5581 return bcn; 5582 5583 /* send a copy to monitor interfaces */ 5584 copy = skb_copy(bcn, GFP_ATOMIC); 5585 if (!copy) 5586 return bcn; 5587 5588 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, false, NULL); 5589 5590 return bcn; 5591 } 5592 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5593 5594 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5595 struct ieee80211_vif *vif) 5596 { 5597 struct sk_buff *skb = NULL; 5598 struct probe_resp *presp = NULL; 5599 struct ieee80211_hdr *hdr; 5600 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5601 5602 if (sdata->vif.type != NL80211_IFTYPE_AP) 5603 return NULL; 5604 5605 rcu_read_lock(); 5606 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5607 if (!presp) 5608 goto out; 5609 5610 skb = dev_alloc_skb(presp->len); 5611 if (!skb) 5612 goto out; 5613 5614 skb_put_data(skb, presp->data, presp->len); 5615 5616 hdr = (struct ieee80211_hdr *) skb->data; 5617 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5618 5619 out: 5620 rcu_read_unlock(); 5621 return skb; 5622 } 5623 EXPORT_SYMBOL(ieee80211_proberesp_get); 5624 5625 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5626 struct ieee80211_vif *vif) 5627 { 5628 struct sk_buff *skb = NULL; 5629 struct fils_discovery_data *tmpl = NULL; 5630 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5631 5632 if (sdata->vif.type != NL80211_IFTYPE_AP) 5633 return NULL; 5634 5635 rcu_read_lock(); 5636 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5637 if (!tmpl) { 5638 rcu_read_unlock(); 5639 return NULL; 5640 } 5641 5642 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5643 if (skb) { 5644 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5645 skb_put_data(skb, tmpl->data, tmpl->len); 5646 } 5647 5648 rcu_read_unlock(); 5649 return skb; 5650 } 5651 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5652 5653 struct sk_buff * 5654 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5655 struct ieee80211_vif *vif) 5656 { 5657 struct sk_buff *skb = NULL; 5658 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5659 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5660 5661 if (sdata->vif.type != NL80211_IFTYPE_AP) 5662 return NULL; 5663 5664 rcu_read_lock(); 5665 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5666 if (!tmpl) { 5667 rcu_read_unlock(); 5668 return NULL; 5669 } 5670 5671 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5672 if (skb) { 5673 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5674 skb_put_data(skb, tmpl->data, tmpl->len); 5675 } 5676 5677 rcu_read_unlock(); 5678 return skb; 5679 } 5680 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5681 5682 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5683 struct ieee80211_vif *vif) 5684 { 5685 struct ieee80211_sub_if_data *sdata; 5686 struct ieee80211_pspoll *pspoll; 5687 struct ieee80211_local *local; 5688 struct sk_buff *skb; 5689 5690 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5691 return NULL; 5692 5693 sdata = vif_to_sdata(vif); 5694 local = sdata->local; 5695 5696 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5697 if (!skb) 5698 return NULL; 5699 5700 skb_reserve(skb, local->hw.extra_tx_headroom); 5701 5702 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5703 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5704 IEEE80211_STYPE_PSPOLL); 5705 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5706 5707 /* aid in PS-Poll has its two MSBs each set to 1 */ 5708 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5709 5710 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5711 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5712 5713 return skb; 5714 } 5715 EXPORT_SYMBOL(ieee80211_pspoll_get); 5716 5717 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5718 struct ieee80211_vif *vif, 5719 int link_id, bool qos_ok) 5720 { 5721 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5722 struct ieee80211_local *local = sdata->local; 5723 struct ieee80211_link_data *link = NULL; 5724 struct ieee80211_hdr_3addr *nullfunc; 5725 struct sk_buff *skb; 5726 bool qos = false; 5727 5728 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5729 return NULL; 5730 5731 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5732 sizeof(*nullfunc) + 2); 5733 if (!skb) 5734 return NULL; 5735 5736 rcu_read_lock(); 5737 if (qos_ok) { 5738 struct sta_info *sta; 5739 5740 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5741 qos = sta && sta->sta.wme; 5742 } 5743 5744 if (link_id >= 0) { 5745 link = rcu_dereference(sdata->link[link_id]); 5746 if (WARN_ON_ONCE(!link)) { 5747 rcu_read_unlock(); 5748 kfree_skb(skb); 5749 return NULL; 5750 } 5751 } 5752 5753 skb_reserve(skb, local->hw.extra_tx_headroom); 5754 5755 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5756 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5757 IEEE80211_STYPE_NULLFUNC | 5758 IEEE80211_FCTL_TODS); 5759 if (qos) { 5760 __le16 qoshdr = cpu_to_le16(7); 5761 5762 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5763 IEEE80211_STYPE_NULLFUNC) != 5764 IEEE80211_STYPE_QOS_NULLFUNC); 5765 nullfunc->frame_control |= 5766 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5767 skb->priority = 7; 5768 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5769 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5770 } 5771 5772 if (link) { 5773 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5774 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5775 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5776 } else { 5777 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5778 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5779 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5780 } 5781 rcu_read_unlock(); 5782 5783 return skb; 5784 } 5785 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5786 5787 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5788 const u8 *src_addr, 5789 const u8 *ssid, size_t ssid_len, 5790 size_t tailroom) 5791 { 5792 struct ieee80211_local *local = hw_to_local(hw); 5793 struct ieee80211_hdr_3addr *hdr; 5794 struct sk_buff *skb; 5795 size_t ie_ssid_len; 5796 u8 *pos; 5797 5798 ie_ssid_len = 2 + ssid_len; 5799 5800 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5801 ie_ssid_len + tailroom); 5802 if (!skb) 5803 return NULL; 5804 5805 skb_reserve(skb, local->hw.extra_tx_headroom); 5806 5807 hdr = skb_put_zero(skb, sizeof(*hdr)); 5808 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5809 IEEE80211_STYPE_PROBE_REQ); 5810 eth_broadcast_addr(hdr->addr1); 5811 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5812 eth_broadcast_addr(hdr->addr3); 5813 5814 pos = skb_put(skb, ie_ssid_len); 5815 *pos++ = WLAN_EID_SSID; 5816 *pos++ = ssid_len; 5817 if (ssid_len) 5818 memcpy(pos, ssid, ssid_len); 5819 pos += ssid_len; 5820 5821 return skb; 5822 } 5823 EXPORT_SYMBOL(ieee80211_probereq_get); 5824 5825 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5826 const void *frame, size_t frame_len, 5827 const struct ieee80211_tx_info *frame_txctl, 5828 struct ieee80211_rts *rts) 5829 { 5830 const struct ieee80211_hdr *hdr = frame; 5831 5832 rts->frame_control = 5833 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5834 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5835 frame_txctl); 5836 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5837 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5838 } 5839 EXPORT_SYMBOL(ieee80211_rts_get); 5840 5841 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5842 const void *frame, size_t frame_len, 5843 const struct ieee80211_tx_info *frame_txctl, 5844 struct ieee80211_cts *cts) 5845 { 5846 const struct ieee80211_hdr *hdr = frame; 5847 5848 cts->frame_control = 5849 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5850 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5851 frame_len, frame_txctl); 5852 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5853 } 5854 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5855 5856 struct sk_buff * 5857 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5858 struct ieee80211_vif *vif) 5859 { 5860 struct ieee80211_local *local = hw_to_local(hw); 5861 struct sk_buff *skb = NULL; 5862 struct ieee80211_tx_data tx; 5863 struct ieee80211_sub_if_data *sdata; 5864 struct ps_data *ps; 5865 struct ieee80211_tx_info *info; 5866 struct ieee80211_chanctx_conf *chanctx_conf; 5867 5868 sdata = vif_to_sdata(vif); 5869 5870 rcu_read_lock(); 5871 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5872 5873 if (!chanctx_conf) 5874 goto out; 5875 5876 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5877 struct beacon_data *beacon = 5878 rcu_dereference(sdata->deflink.u.ap.beacon); 5879 5880 if (!beacon || !beacon->head) 5881 goto out; 5882 5883 ps = &sdata->u.ap.ps; 5884 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5885 ps = &sdata->u.mesh.ps; 5886 } else { 5887 goto out; 5888 } 5889 5890 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5891 goto out; /* send buffered bc/mc only after DTIM beacon */ 5892 5893 while (1) { 5894 skb = skb_dequeue(&ps->bc_buf); 5895 if (!skb) 5896 goto out; 5897 local->total_ps_buffered--; 5898 5899 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5900 struct ieee80211_hdr *hdr = 5901 (struct ieee80211_hdr *) skb->data; 5902 /* more buffered multicast/broadcast frames ==> set 5903 * MoreData flag in IEEE 802.11 header to inform PS 5904 * STAs */ 5905 hdr->frame_control |= 5906 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5907 } 5908 5909 if (sdata->vif.type == NL80211_IFTYPE_AP) 5910 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5911 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5912 break; 5913 ieee80211_free_txskb(hw, skb); 5914 } 5915 5916 info = IEEE80211_SKB_CB(skb); 5917 5918 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5919 info->band = chanctx_conf->def.chan->band; 5920 5921 if (invoke_tx_handlers(&tx)) 5922 skb = NULL; 5923 out: 5924 rcu_read_unlock(); 5925 5926 return skb; 5927 } 5928 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5929 5930 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5931 { 5932 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5933 struct ieee80211_sub_if_data *sdata = sta->sdata; 5934 struct ieee80211_local *local = sdata->local; 5935 int ret; 5936 u32 queues; 5937 5938 lockdep_assert_wiphy(local->hw.wiphy); 5939 5940 /* only some cases are supported right now */ 5941 switch (sdata->vif.type) { 5942 case NL80211_IFTYPE_STATION: 5943 case NL80211_IFTYPE_AP: 5944 case NL80211_IFTYPE_AP_VLAN: 5945 break; 5946 default: 5947 WARN_ON(1); 5948 return -EINVAL; 5949 } 5950 5951 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5952 return -EINVAL; 5953 5954 if (sta->reserved_tid == tid) { 5955 ret = 0; 5956 goto out; 5957 } 5958 5959 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5960 sdata_err(sdata, "TID reservation already active\n"); 5961 ret = -EALREADY; 5962 goto out; 5963 } 5964 5965 ieee80211_stop_vif_queues(sdata->local, sdata, 5966 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5967 5968 synchronize_net(); 5969 5970 /* Tear down BA sessions so we stop aggregating on this TID */ 5971 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5972 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5973 __ieee80211_stop_tx_ba_session(sta, tid, 5974 AGG_STOP_LOCAL_REQUEST); 5975 } 5976 5977 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5978 __ieee80211_flush_queues(local, sdata, queues, false); 5979 5980 sta->reserved_tid = tid; 5981 5982 ieee80211_wake_vif_queues(local, sdata, 5983 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5984 5985 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5986 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5987 5988 ret = 0; 5989 out: 5990 return ret; 5991 } 5992 EXPORT_SYMBOL(ieee80211_reserve_tid); 5993 5994 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5995 { 5996 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5997 struct ieee80211_sub_if_data *sdata = sta->sdata; 5998 5999 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6000 6001 /* only some cases are supported right now */ 6002 switch (sdata->vif.type) { 6003 case NL80211_IFTYPE_STATION: 6004 case NL80211_IFTYPE_AP: 6005 case NL80211_IFTYPE_AP_VLAN: 6006 break; 6007 default: 6008 WARN_ON(1); 6009 return; 6010 } 6011 6012 if (tid != sta->reserved_tid) { 6013 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6014 return; 6015 } 6016 6017 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6018 } 6019 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6020 6021 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6022 struct sk_buff *skb, int tid, int link_id, 6023 enum nl80211_band band) 6024 { 6025 const struct ieee80211_hdr *hdr = (void *)skb->data; 6026 int ac = ieee80211_ac_from_tid(tid); 6027 unsigned int link; 6028 6029 skb_reset_mac_header(skb); 6030 skb_set_queue_mapping(skb, ac); 6031 skb->priority = tid; 6032 6033 skb->dev = sdata->dev; 6034 6035 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6036 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6037 IEEE80211_LINK_UNSPECIFIED)); 6038 6039 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6040 link = 0; 6041 } else if (link_id >= 0) { 6042 link = link_id; 6043 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6044 /* address from the MLD */ 6045 link = IEEE80211_LINK_UNSPECIFIED; 6046 } else { 6047 /* otherwise must be addressed from a link */ 6048 rcu_read_lock(); 6049 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6050 struct ieee80211_bss_conf *link_conf; 6051 6052 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6053 if (!link_conf) 6054 continue; 6055 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6056 break; 6057 } 6058 rcu_read_unlock(); 6059 6060 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6061 link = ffs(sdata->vif.active_links) - 1; 6062 } 6063 6064 IEEE80211_SKB_CB(skb)->control.flags |= 6065 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6066 6067 /* 6068 * The other path calling ieee80211_xmit is from the tasklet, 6069 * and while we can handle concurrent transmissions locking 6070 * requirements are that we do not come into tx with bhs on. 6071 */ 6072 local_bh_disable(); 6073 IEEE80211_SKB_CB(skb)->band = band; 6074 ieee80211_xmit(sdata, NULL, skb); 6075 local_bh_enable(); 6076 } 6077 6078 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6079 struct sk_buff *skb, int tid, int link_id) 6080 { 6081 struct ieee80211_chanctx_conf *chanctx_conf; 6082 enum nl80211_band band; 6083 6084 rcu_read_lock(); 6085 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6086 WARN_ON(link_id >= 0); 6087 chanctx_conf = 6088 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6089 if (WARN_ON(!chanctx_conf)) { 6090 rcu_read_unlock(); 6091 kfree_skb(skb); 6092 return; 6093 } 6094 band = chanctx_conf->def.chan->band; 6095 } else { 6096 WARN_ON(link_id >= 0 && 6097 !(sdata->vif.active_links & BIT(link_id))); 6098 /* MLD transmissions must not rely on the band */ 6099 band = 0; 6100 } 6101 6102 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6103 rcu_read_unlock(); 6104 } 6105 6106 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6107 const u8 *buf, size_t len, 6108 const u8 *dest, __be16 proto, bool unencrypted, 6109 int link_id, u64 *cookie) 6110 { 6111 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6112 struct ieee80211_local *local = sdata->local; 6113 struct sta_info *sta; 6114 struct sk_buff *skb; 6115 struct ethhdr *ehdr; 6116 u32 ctrl_flags = 0; 6117 u32 flags = 0; 6118 int err; 6119 6120 /* mutex lock is only needed for incrementing the cookie counter */ 6121 lockdep_assert_wiphy(local->hw.wiphy); 6122 6123 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6124 * or Pre-Authentication 6125 */ 6126 if (proto != sdata->control_port_protocol && 6127 proto != cpu_to_be16(ETH_P_PREAUTH)) 6128 return -EINVAL; 6129 6130 if (proto == sdata->control_port_protocol) 6131 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6132 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6133 6134 if (unencrypted) 6135 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6136 6137 if (cookie) 6138 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6139 6140 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6141 6142 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6143 sizeof(struct ethhdr) + len); 6144 if (!skb) 6145 return -ENOMEM; 6146 6147 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6148 6149 skb_put_data(skb, buf, len); 6150 6151 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6152 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6153 6154 /* we may override the SA for MLO STA later */ 6155 if (link_id < 0) { 6156 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6157 IEEE80211_TX_CTRL_MLO_LINK); 6158 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6159 } else { 6160 struct ieee80211_bss_conf *link_conf; 6161 6162 ctrl_flags |= u32_encode_bits(link_id, 6163 IEEE80211_TX_CTRL_MLO_LINK); 6164 6165 rcu_read_lock(); 6166 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6167 if (!link_conf) { 6168 dev_kfree_skb(skb); 6169 rcu_read_unlock(); 6170 return -ENOLINK; 6171 } 6172 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6173 rcu_read_unlock(); 6174 } 6175 6176 ehdr->h_proto = proto; 6177 6178 skb->dev = dev; 6179 skb->protocol = proto; 6180 skb_reset_network_header(skb); 6181 skb_reset_mac_header(skb); 6182 6183 if (local->hw.queues < IEEE80211_NUM_ACS) 6184 goto start_xmit; 6185 6186 /* update QoS header to prioritize control port frames if possible, 6187 * priorization also happens for control port frames send over 6188 * AF_PACKET 6189 */ 6190 rcu_read_lock(); 6191 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6192 if (err) { 6193 dev_kfree_skb(skb); 6194 rcu_read_unlock(); 6195 return err; 6196 } 6197 6198 if (!IS_ERR(sta)) { 6199 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6200 6201 skb_set_queue_mapping(skb, queue); 6202 6203 /* 6204 * for MLO STA, the SA should be the AP MLD address, but 6205 * the link ID has been selected already 6206 */ 6207 if (sta && sta->sta.mlo) 6208 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6209 } 6210 rcu_read_unlock(); 6211 6212 start_xmit: 6213 local_bh_disable(); 6214 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6215 local_bh_enable(); 6216 6217 return 0; 6218 } 6219 6220 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6221 const u8 *buf, size_t len) 6222 { 6223 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6224 struct ieee80211_local *local = sdata->local; 6225 struct sk_buff *skb; 6226 6227 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6228 30 + /* header size */ 6229 18); /* 11s header size */ 6230 if (!skb) 6231 return -ENOMEM; 6232 6233 skb_reserve(skb, local->hw.extra_tx_headroom); 6234 skb_put_data(skb, buf, len); 6235 6236 skb->dev = dev; 6237 skb->protocol = htons(ETH_P_802_3); 6238 skb_reset_network_header(skb); 6239 skb_reset_mac_header(skb); 6240 6241 local_bh_disable(); 6242 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6243 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6244 NULL); 6245 local_bh_enable(); 6246 6247 return 0; 6248 } 6249