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) || !sta->uploaded) 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 rcu_read_lock(); 3104 link = rcu_dereference(sdata->link[tdls_link_id]); 3105 if (!WARN_ON_ONCE(!link)) 3106 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3107 rcu_read_unlock(); 3108 build.hdr_len = 24; 3109 break; 3110 } 3111 3112 if (sdata->u.mgd.use_4addr) { 3113 /* non-regular ethertype cannot use the fastpath */ 3114 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3115 IEEE80211_FCTL_TODS); 3116 /* RA TA DA SA */ 3117 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3118 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3119 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3120 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3121 build.hdr_len = 30; 3122 break; 3123 } 3124 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3125 /* BSSID SA DA */ 3126 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3127 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3128 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3129 build.hdr_len = 24; 3130 break; 3131 case NL80211_IFTYPE_AP_VLAN: 3132 if (sdata->wdev.use_4addr) { 3133 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3134 IEEE80211_FCTL_TODS); 3135 /* RA TA DA SA */ 3136 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3137 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3138 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3139 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3140 build.hdr_len = 30; 3141 break; 3142 } 3143 fallthrough; 3144 case NL80211_IFTYPE_AP: 3145 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3146 /* DA BSSID SA */ 3147 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3148 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3149 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3150 } else { 3151 unsigned int link_id = sta->deflink.link_id; 3152 struct ieee80211_link_data *link; 3153 3154 rcu_read_lock(); 3155 link = rcu_dereference(sdata->link[link_id]); 3156 if (WARN_ON(!link)) { 3157 rcu_read_unlock(); 3158 goto out; 3159 } 3160 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3161 rcu_read_unlock(); 3162 } 3163 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3164 build.hdr_len = 24; 3165 break; 3166 default: 3167 /* not handled on fast-xmit */ 3168 goto out; 3169 } 3170 3171 if (sta->sta.wme) { 3172 build.hdr_len += 2; 3173 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3174 } 3175 3176 /* We store the key here so there's no point in using rcu_dereference() 3177 * but that's fine because the code that changes the pointers will call 3178 * this function after doing so. For a single CPU that would be enough, 3179 * for multiple see the comment above. 3180 */ 3181 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3182 if (!build.key) 3183 build.key = rcu_access_pointer(sdata->default_unicast_key); 3184 if (build.key) { 3185 bool gen_iv, iv_spc, mmic; 3186 3187 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3188 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3189 mmic = build.key->conf.flags & 3190 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3191 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3192 3193 /* don't handle software crypto */ 3194 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3195 goto out; 3196 3197 /* Key is being removed */ 3198 if (build.key->flags & KEY_FLAG_TAINTED) 3199 goto out; 3200 3201 switch (build.key->conf.cipher) { 3202 case WLAN_CIPHER_SUITE_CCMP: 3203 case WLAN_CIPHER_SUITE_CCMP_256: 3204 if (gen_iv) 3205 build.pn_offs = build.hdr_len; 3206 if (gen_iv || iv_spc) 3207 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3208 break; 3209 case WLAN_CIPHER_SUITE_GCMP: 3210 case WLAN_CIPHER_SUITE_GCMP_256: 3211 if (gen_iv) 3212 build.pn_offs = build.hdr_len; 3213 if (gen_iv || iv_spc) 3214 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3215 break; 3216 case WLAN_CIPHER_SUITE_TKIP: 3217 /* cannot handle MMIC or IV generation in xmit-fast */ 3218 if (mmic || gen_iv) 3219 goto out; 3220 if (iv_spc) 3221 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3222 break; 3223 case WLAN_CIPHER_SUITE_WEP40: 3224 case WLAN_CIPHER_SUITE_WEP104: 3225 /* cannot handle IV generation in fast-xmit */ 3226 if (gen_iv) 3227 goto out; 3228 if (iv_spc) 3229 build.hdr_len += IEEE80211_WEP_IV_LEN; 3230 break; 3231 case WLAN_CIPHER_SUITE_AES_CMAC: 3232 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3233 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3234 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3235 WARN(1, 3236 "management cipher suite 0x%x enabled for data\n", 3237 build.key->conf.cipher); 3238 goto out; 3239 default: 3240 /* we don't know how to generate IVs for this at all */ 3241 if (WARN_ON(gen_iv)) 3242 goto out; 3243 } 3244 3245 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3246 } 3247 3248 hdr->frame_control = fc; 3249 3250 memcpy(build.hdr + build.hdr_len, 3251 rfc1042_header, sizeof(rfc1042_header)); 3252 build.hdr_len += sizeof(rfc1042_header); 3253 3254 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3255 /* if the kmemdup fails, continue w/o fast_tx */ 3256 3257 out: 3258 /* we might have raced against another call to this function */ 3259 old = rcu_dereference_protected(sta->fast_tx, 3260 lockdep_is_held(&sta->lock)); 3261 rcu_assign_pointer(sta->fast_tx, fast_tx); 3262 if (old) 3263 kfree_rcu(old, rcu_head); 3264 spin_unlock_bh(&sta->lock); 3265 } 3266 3267 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3268 { 3269 struct sta_info *sta; 3270 3271 rcu_read_lock(); 3272 list_for_each_entry_rcu(sta, &local->sta_list, list) 3273 ieee80211_check_fast_xmit(sta); 3274 rcu_read_unlock(); 3275 } 3276 3277 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3278 { 3279 struct ieee80211_local *local = sdata->local; 3280 struct sta_info *sta; 3281 3282 rcu_read_lock(); 3283 3284 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3285 if (sdata != sta->sdata && 3286 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3287 continue; 3288 ieee80211_check_fast_xmit(sta); 3289 } 3290 3291 rcu_read_unlock(); 3292 } 3293 3294 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3295 { 3296 struct ieee80211_fast_tx *fast_tx; 3297 3298 spin_lock_bh(&sta->lock); 3299 fast_tx = rcu_dereference_protected(sta->fast_tx, 3300 lockdep_is_held(&sta->lock)); 3301 RCU_INIT_POINTER(sta->fast_tx, NULL); 3302 spin_unlock_bh(&sta->lock); 3303 3304 if (fast_tx) 3305 kfree_rcu(fast_tx, rcu_head); 3306 } 3307 3308 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3309 struct sk_buff *skb, int headroom) 3310 { 3311 if (skb_headroom(skb) < headroom) { 3312 I802_DEBUG_INC(local->tx_expand_skb_head); 3313 3314 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3315 wiphy_debug(local->hw.wiphy, 3316 "failed to reallocate TX buffer\n"); 3317 return false; 3318 } 3319 } 3320 3321 return true; 3322 } 3323 3324 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3325 struct ieee80211_fast_tx *fast_tx, 3326 struct sk_buff *skb) 3327 { 3328 struct ieee80211_local *local = sdata->local; 3329 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3330 struct ieee80211_hdr *hdr; 3331 struct ethhdr *amsdu_hdr; 3332 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3333 int subframe_len = skb->len - hdr_len; 3334 void *data; 3335 u8 *qc, *h_80211_src, *h_80211_dst; 3336 const u8 *bssid; 3337 3338 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3339 return false; 3340 3341 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3342 return true; 3343 3344 if (!ieee80211_amsdu_realloc_pad(local, skb, 3345 sizeof(*amsdu_hdr) + 3346 local->hw.extra_tx_headroom)) 3347 return false; 3348 3349 data = skb_push(skb, sizeof(*amsdu_hdr)); 3350 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3351 hdr = data; 3352 amsdu_hdr = data + hdr_len; 3353 /* h_80211_src/dst is addr* field within hdr */ 3354 h_80211_src = data + fast_tx->sa_offs; 3355 h_80211_dst = data + fast_tx->da_offs; 3356 3357 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3358 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3359 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3360 3361 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3362 * fields needs to be changed to BSSID for A-MSDU frames depending 3363 * on FromDS/ToDS values. 3364 */ 3365 switch (sdata->vif.type) { 3366 case NL80211_IFTYPE_STATION: 3367 bssid = sdata->vif.cfg.ap_addr; 3368 break; 3369 case NL80211_IFTYPE_AP: 3370 case NL80211_IFTYPE_AP_VLAN: 3371 bssid = sdata->vif.addr; 3372 break; 3373 default: 3374 bssid = NULL; 3375 } 3376 3377 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3378 ether_addr_copy(h_80211_src, bssid); 3379 3380 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3381 ether_addr_copy(h_80211_dst, bssid); 3382 3383 qc = ieee80211_get_qos_ctl(hdr); 3384 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3385 3386 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3387 3388 return true; 3389 } 3390 3391 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3392 struct sta_info *sta, 3393 struct ieee80211_fast_tx *fast_tx, 3394 struct sk_buff *skb, 3395 const u8 *da, const u8 *sa) 3396 { 3397 struct ieee80211_local *local = sdata->local; 3398 struct fq *fq = &local->fq; 3399 struct fq_tin *tin; 3400 struct fq_flow *flow; 3401 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3402 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3403 struct txq_info *txqi; 3404 struct sk_buff **frag_tail, *head; 3405 int subframe_len = skb->len - ETH_ALEN; 3406 u8 max_subframes = sta->sta.max_amsdu_subframes; 3407 int max_frags = local->hw.max_tx_fragments; 3408 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3409 int orig_truesize; 3410 u32 flow_idx; 3411 __be16 len; 3412 void *data; 3413 bool ret = false; 3414 unsigned int orig_len; 3415 int n = 2, nfrags, pad = 0; 3416 u16 hdrlen; 3417 3418 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3419 return false; 3420 3421 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3422 return false; 3423 3424 if (ieee80211_vif_is_mesh(&sdata->vif)) 3425 return false; 3426 3427 if (skb_is_gso(skb)) 3428 return false; 3429 3430 if (!txq) 3431 return false; 3432 3433 txqi = to_txq_info(txq); 3434 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3435 return false; 3436 3437 if (sta->sta.cur->max_rc_amsdu_len) 3438 max_amsdu_len = min_t(int, max_amsdu_len, 3439 sta->sta.cur->max_rc_amsdu_len); 3440 3441 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3442 max_amsdu_len = min_t(int, max_amsdu_len, 3443 sta->sta.cur->max_tid_amsdu_len[tid]); 3444 3445 flow_idx = fq_flow_idx(fq, skb); 3446 3447 spin_lock_bh(&fq->lock); 3448 3449 /* TODO: Ideally aggregation should be done on dequeue to remain 3450 * responsive to environment changes. 3451 */ 3452 3453 tin = &txqi->tin; 3454 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3455 head = skb_peek_tail(&flow->queue); 3456 if (!head || skb_is_gso(head)) 3457 goto out; 3458 3459 orig_truesize = head->truesize; 3460 orig_len = head->len; 3461 3462 if (skb->len + head->len > max_amsdu_len) 3463 goto out; 3464 3465 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3466 nfrags += 1 + skb_shinfo(head)->nr_frags; 3467 frag_tail = &skb_shinfo(head)->frag_list; 3468 while (*frag_tail) { 3469 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3470 frag_tail = &(*frag_tail)->next; 3471 n++; 3472 } 3473 3474 if (max_subframes && n > max_subframes) 3475 goto out; 3476 3477 if (max_frags && nfrags > max_frags) 3478 goto out; 3479 3480 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3481 goto out; 3482 3483 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3484 goto out; 3485 3486 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3487 * and frag_tail should be &skb_shinfo(head)->frag_list. 3488 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3489 * Reload frag_tail to have it pointing to the correct place. 3490 */ 3491 if (n == 2) 3492 frag_tail = &skb_shinfo(head)->frag_list; 3493 3494 /* 3495 * Pad out the previous subframe to a multiple of 4 by adding the 3496 * padding to the next one, that's being added. Note that head->len 3497 * is the length of the full A-MSDU, but that works since each time 3498 * we add a new subframe we pad out the previous one to a multiple 3499 * of 4 and thus it no longer matters in the next round. 3500 */ 3501 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3502 if ((head->len - hdrlen) & 3) 3503 pad = 4 - ((head->len - hdrlen) & 3); 3504 3505 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3506 2 + pad)) 3507 goto out_recalc; 3508 3509 ret = true; 3510 data = skb_push(skb, ETH_ALEN + 2); 3511 ether_addr_copy(data, da); 3512 ether_addr_copy(data + ETH_ALEN, sa); 3513 3514 data += 2 * ETH_ALEN; 3515 len = cpu_to_be16(subframe_len); 3516 memcpy(data, &len, 2); 3517 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3518 3519 memset(skb_push(skb, pad), 0, pad); 3520 3521 head->len += skb->len; 3522 head->data_len += skb->len; 3523 *frag_tail = skb; 3524 3525 out_recalc: 3526 fq->memory_usage += head->truesize - orig_truesize; 3527 if (head->len != orig_len) { 3528 flow->backlog += head->len - orig_len; 3529 tin->backlog_bytes += head->len - orig_len; 3530 } 3531 out: 3532 spin_unlock_bh(&fq->lock); 3533 3534 return ret; 3535 } 3536 3537 /* 3538 * Can be called while the sta lock is held. Anything that can cause packets to 3539 * be generated will cause deadlock! 3540 */ 3541 static ieee80211_tx_result 3542 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3543 struct sta_info *sta, u8 pn_offs, 3544 struct ieee80211_key *key, 3545 struct ieee80211_tx_data *tx) 3546 { 3547 struct sk_buff *skb = tx->skb; 3548 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3549 struct ieee80211_hdr *hdr = (void *)skb->data; 3550 u8 tid = IEEE80211_NUM_TIDS; 3551 3552 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3553 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3554 return TX_DROP; 3555 3556 if (key) 3557 info->control.hw_key = &key->conf; 3558 3559 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3560 3561 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3562 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3563 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3564 } else { 3565 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3566 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3567 sdata->sequence_number += 0x10; 3568 } 3569 3570 if (skb_shinfo(skb)->gso_size) 3571 sta->deflink.tx_stats.msdu[tid] += 3572 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3573 else 3574 sta->deflink.tx_stats.msdu[tid]++; 3575 3576 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3577 3578 /* statistics normally done by ieee80211_tx_h_stats (but that 3579 * has to consider fragmentation, so is more complex) 3580 */ 3581 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3582 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3583 3584 if (pn_offs) { 3585 u64 pn; 3586 u8 *crypto_hdr = skb->data + pn_offs; 3587 3588 switch (key->conf.cipher) { 3589 case WLAN_CIPHER_SUITE_CCMP: 3590 case WLAN_CIPHER_SUITE_CCMP_256: 3591 case WLAN_CIPHER_SUITE_GCMP: 3592 case WLAN_CIPHER_SUITE_GCMP_256: 3593 pn = atomic64_inc_return(&key->conf.tx_pn); 3594 crypto_hdr[0] = pn; 3595 crypto_hdr[1] = pn >> 8; 3596 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3597 crypto_hdr[4] = pn >> 16; 3598 crypto_hdr[5] = pn >> 24; 3599 crypto_hdr[6] = pn >> 32; 3600 crypto_hdr[7] = pn >> 40; 3601 break; 3602 } 3603 } 3604 3605 return TX_CONTINUE; 3606 } 3607 3608 static netdev_features_t 3609 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3610 { 3611 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3612 return sdata->vif.netdev_features; 3613 3614 if (!sdata->bss) 3615 return 0; 3616 3617 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3618 return sdata->vif.netdev_features; 3619 } 3620 3621 static struct sk_buff * 3622 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3623 { 3624 if (skb_is_gso(skb)) { 3625 struct sk_buff *segs; 3626 3627 segs = skb_gso_segment(skb, features); 3628 if (!segs) 3629 return skb; 3630 if (IS_ERR(segs)) 3631 goto free; 3632 3633 consume_skb(skb); 3634 return segs; 3635 } 3636 3637 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3638 goto free; 3639 3640 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3641 int ofs = skb_checksum_start_offset(skb); 3642 3643 if (skb->encapsulation) 3644 skb_set_inner_transport_header(skb, ofs); 3645 else 3646 skb_set_transport_header(skb, ofs); 3647 3648 if (skb_csum_hwoffload_help(skb, features)) 3649 goto free; 3650 } 3651 3652 skb_mark_not_on_list(skb); 3653 return skb; 3654 3655 free: 3656 kfree_skb(skb); 3657 return NULL; 3658 } 3659 3660 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3661 struct sta_info *sta, 3662 struct ieee80211_fast_tx *fast_tx, 3663 struct sk_buff *skb, bool ampdu, 3664 const u8 *da, const u8 *sa) 3665 { 3666 struct ieee80211_local *local = sdata->local; 3667 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3668 struct ieee80211_tx_info *info; 3669 struct ieee80211_tx_data tx; 3670 ieee80211_tx_result r; 3671 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3672 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3673 3674 skb = skb_share_check(skb, GFP_ATOMIC); 3675 if (unlikely(!skb)) 3676 return; 3677 3678 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3679 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3680 return; 3681 3682 /* will not be crypto-handled beyond what we do here, so use false 3683 * as the may-encrypt argument for the resize to not account for 3684 * more room than we already have in 'extra_head' 3685 */ 3686 if (unlikely(ieee80211_skb_resize(sdata, skb, 3687 max_t(int, extra_head + hw_headroom - 3688 skb_headroom(skb), 0), 3689 ENCRYPT_NO))) 3690 goto free; 3691 3692 hdr = skb_push(skb, extra_head); 3693 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3694 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3695 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3696 3697 info = IEEE80211_SKB_CB(skb); 3698 memset(info, 0, sizeof(*info)); 3699 info->band = fast_tx->band; 3700 info->control.vif = &sdata->vif; 3701 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3702 IEEE80211_TX_CTL_DONTFRAG; 3703 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3704 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3705 IEEE80211_TX_CTRL_MLO_LINK); 3706 3707 #ifdef CONFIG_MAC80211_DEBUGFS 3708 if (local->force_tx_status) 3709 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3710 #endif 3711 3712 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3713 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3714 3715 *ieee80211_get_qos_ctl(hdr) = tid; 3716 } 3717 3718 __skb_queue_head_init(&tx.skbs); 3719 3720 tx.flags = IEEE80211_TX_UNICAST; 3721 tx.local = local; 3722 tx.sdata = sdata; 3723 tx.sta = sta; 3724 tx.key = fast_tx->key; 3725 3726 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3727 return; 3728 3729 tx.skb = skb; 3730 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3731 fast_tx->key, &tx); 3732 tx.skb = NULL; 3733 if (r == TX_DROP) 3734 goto free; 3735 3736 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3737 sdata = container_of(sdata->bss, 3738 struct ieee80211_sub_if_data, u.ap); 3739 3740 __skb_queue_tail(&tx.skbs, skb); 3741 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3742 return; 3743 3744 free: 3745 kfree_skb(skb); 3746 } 3747 3748 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3749 struct sta_info *sta, 3750 struct ieee80211_fast_tx *fast_tx, 3751 struct sk_buff *skb) 3752 { 3753 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3754 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3755 struct tid_ampdu_tx *tid_tx = NULL; 3756 struct sk_buff *next; 3757 struct ethhdr eth; 3758 u8 tid = IEEE80211_NUM_TIDS; 3759 3760 /* control port protocol needs a lot of special handling */ 3761 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3762 return false; 3763 3764 /* only RFC 1042 SNAP */ 3765 if (ethertype < ETH_P_802_3_MIN) 3766 return false; 3767 3768 /* don't handle TX status request here either */ 3769 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3770 return false; 3771 3772 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3773 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3774 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3775 if (tid_tx) { 3776 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3777 return false; 3778 if (tid_tx->timeout) 3779 tid_tx->last_tx = jiffies; 3780 } 3781 } 3782 3783 memcpy(ð, skb->data, ETH_HLEN - 2); 3784 3785 /* after this point (skb is modified) we cannot return false */ 3786 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3787 if (!skb) 3788 return true; 3789 3790 skb_list_walk_safe(skb, skb, next) { 3791 skb_mark_not_on_list(skb); 3792 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3793 eth.h_dest, eth.h_source); 3794 } 3795 3796 return true; 3797 } 3798 3799 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3800 struct ieee80211_txq *txq) 3801 { 3802 struct ieee80211_local *local = hw_to_local(hw); 3803 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3804 struct ieee80211_hdr *hdr; 3805 struct sk_buff *skb = NULL; 3806 struct fq *fq = &local->fq; 3807 struct fq_tin *tin = &txqi->tin; 3808 struct ieee80211_tx_info *info; 3809 struct ieee80211_tx_data tx; 3810 ieee80211_tx_result r; 3811 struct ieee80211_vif *vif = txq->vif; 3812 int q = vif->hw_queue[txq->ac]; 3813 unsigned long flags; 3814 bool q_stopped; 3815 3816 WARN_ON_ONCE(softirq_count() == 0); 3817 3818 if (!ieee80211_txq_airtime_check(hw, txq)) 3819 return NULL; 3820 3821 begin: 3822 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3823 q_stopped = local->queue_stop_reasons[q]; 3824 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3825 3826 if (unlikely(q_stopped)) { 3827 /* mark for waking later */ 3828 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3829 return NULL; 3830 } 3831 3832 spin_lock_bh(&fq->lock); 3833 3834 /* Make sure fragments stay together. */ 3835 skb = __skb_dequeue(&txqi->frags); 3836 if (unlikely(skb)) { 3837 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3838 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3839 goto out; 3840 IEEE80211_SKB_CB(skb)->control.flags &= 3841 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3842 } else { 3843 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3844 goto out; 3845 3846 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3847 } 3848 3849 if (!skb) 3850 goto out; 3851 3852 spin_unlock_bh(&fq->lock); 3853 3854 hdr = (struct ieee80211_hdr *)skb->data; 3855 info = IEEE80211_SKB_CB(skb); 3856 3857 memset(&tx, 0, sizeof(tx)); 3858 __skb_queue_head_init(&tx.skbs); 3859 tx.local = local; 3860 tx.skb = skb; 3861 tx.sdata = vif_to_sdata(info->control.vif); 3862 3863 if (txq->sta) { 3864 tx.sta = container_of(txq->sta, struct sta_info, sta); 3865 /* 3866 * Drop unicast frames to unauthorised stations unless they are 3867 * injected frames or EAPOL frames from the local station. 3868 */ 3869 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3870 ieee80211_is_data(hdr->frame_control) && 3871 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3872 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3873 !is_multicast_ether_addr(hdr->addr1) && 3874 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3875 (!(info->control.flags & 3876 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3877 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3878 NULL)))) { 3879 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3880 ieee80211_free_txskb(&local->hw, skb); 3881 goto begin; 3882 } 3883 } 3884 3885 /* 3886 * The key can be removed while the packet was queued, so need to call 3887 * this here to get the current key. 3888 */ 3889 r = ieee80211_tx_h_select_key(&tx); 3890 if (r != TX_CONTINUE) { 3891 ieee80211_free_txskb(&local->hw, skb); 3892 goto begin; 3893 } 3894 3895 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3896 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3897 IEEE80211_TX_CTL_DONTFRAG); 3898 3899 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3900 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3901 r = ieee80211_tx_h_rate_ctrl(&tx); 3902 if (r != TX_CONTINUE) { 3903 ieee80211_free_txskb(&local->hw, skb); 3904 goto begin; 3905 } 3906 } 3907 goto encap_out; 3908 } 3909 3910 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3911 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3912 sta); 3913 u8 pn_offs = 0; 3914 3915 if (tx.key && 3916 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3917 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3918 3919 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3920 tx.key, &tx); 3921 if (r != TX_CONTINUE) { 3922 ieee80211_free_txskb(&local->hw, skb); 3923 goto begin; 3924 } 3925 } else { 3926 if (invoke_tx_handlers_late(&tx)) 3927 goto begin; 3928 3929 skb = __skb_dequeue(&tx.skbs); 3930 3931 if (!skb_queue_empty(&tx.skbs)) { 3932 spin_lock_bh(&fq->lock); 3933 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3934 spin_unlock_bh(&fq->lock); 3935 } 3936 } 3937 3938 if (skb_has_frag_list(skb) && 3939 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3940 if (skb_linearize(skb)) { 3941 ieee80211_free_txskb(&local->hw, skb); 3942 goto begin; 3943 } 3944 } 3945 3946 switch (tx.sdata->vif.type) { 3947 case NL80211_IFTYPE_MONITOR: 3948 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3949 vif = &tx.sdata->vif; 3950 break; 3951 } 3952 tx.sdata = rcu_dereference(local->monitor_sdata); 3953 if (tx.sdata) { 3954 vif = &tx.sdata->vif; 3955 info->hw_queue = 3956 vif->hw_queue[skb_get_queue_mapping(skb)]; 3957 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3958 ieee80211_free_txskb(&local->hw, skb); 3959 goto begin; 3960 } else { 3961 vif = NULL; 3962 } 3963 break; 3964 case NL80211_IFTYPE_AP_VLAN: 3965 tx.sdata = container_of(tx.sdata->bss, 3966 struct ieee80211_sub_if_data, u.ap); 3967 fallthrough; 3968 default: 3969 vif = &tx.sdata->vif; 3970 break; 3971 } 3972 3973 encap_out: 3974 IEEE80211_SKB_CB(skb)->control.vif = vif; 3975 3976 if (tx.sta && 3977 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3978 bool ampdu = txq->ac != IEEE80211_AC_VO; 3979 u32 airtime; 3980 3981 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3982 skb->len, ampdu); 3983 if (airtime) { 3984 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3985 ieee80211_sta_update_pending_airtime(local, tx.sta, 3986 txq->ac, 3987 airtime, 3988 false); 3989 } 3990 } 3991 3992 return skb; 3993 3994 out: 3995 spin_unlock_bh(&fq->lock); 3996 3997 return skb; 3998 } 3999 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4000 4001 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4002 { 4003 struct airtime_info *air_info = &sta->airtime[ac]; 4004 4005 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4006 } 4007 4008 static void 4009 ieee80211_txq_set_active(struct txq_info *txqi) 4010 { 4011 struct sta_info *sta; 4012 4013 if (!txqi->txq.sta) 4014 return; 4015 4016 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4017 sta->airtime[txqi->txq.ac].last_active = jiffies; 4018 } 4019 4020 static bool 4021 ieee80211_txq_keep_active(struct txq_info *txqi) 4022 { 4023 struct sta_info *sta; 4024 4025 if (!txqi->txq.sta) 4026 return false; 4027 4028 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4029 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4030 return false; 4031 4032 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4033 } 4034 4035 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4036 { 4037 struct ieee80211_local *local = hw_to_local(hw); 4038 struct ieee80211_txq *ret = NULL; 4039 struct txq_info *txqi = NULL, *head = NULL; 4040 bool found_eligible_txq = false; 4041 4042 spin_lock_bh(&local->active_txq_lock[ac]); 4043 4044 if (!local->schedule_round[ac]) 4045 goto out; 4046 4047 begin: 4048 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4049 struct txq_info, 4050 schedule_order); 4051 if (!txqi) 4052 goto out; 4053 4054 if (txqi == head) { 4055 if (!found_eligible_txq) 4056 goto out; 4057 else 4058 found_eligible_txq = false; 4059 } 4060 4061 if (!head) 4062 head = txqi; 4063 4064 if (txqi->txq.sta) { 4065 struct sta_info *sta = container_of(txqi->txq.sta, 4066 struct sta_info, sta); 4067 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4068 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4069 4070 if (aql_check) 4071 found_eligible_txq = true; 4072 4073 if (deficit < 0) 4074 sta->airtime[txqi->txq.ac].deficit += 4075 sta->airtime_weight; 4076 4077 if (deficit < 0 || !aql_check) { 4078 list_move_tail(&txqi->schedule_order, 4079 &local->active_txqs[txqi->txq.ac]); 4080 goto begin; 4081 } 4082 } 4083 4084 if (txqi->schedule_round == local->schedule_round[ac]) 4085 goto out; 4086 4087 list_del_init(&txqi->schedule_order); 4088 txqi->schedule_round = local->schedule_round[ac]; 4089 ret = &txqi->txq; 4090 4091 out: 4092 spin_unlock_bh(&local->active_txq_lock[ac]); 4093 return ret; 4094 } 4095 EXPORT_SYMBOL(ieee80211_next_txq); 4096 4097 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4098 struct ieee80211_txq *txq, 4099 bool force) 4100 { 4101 struct ieee80211_local *local = hw_to_local(hw); 4102 struct txq_info *txqi = to_txq_info(txq); 4103 bool has_queue; 4104 4105 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4106 4107 has_queue = force || txq_has_queue(txq); 4108 if (list_empty(&txqi->schedule_order) && 4109 (has_queue || ieee80211_txq_keep_active(txqi))) { 4110 /* If airtime accounting is active, always enqueue STAs at the 4111 * head of the list to ensure that they only get moved to the 4112 * back by the airtime DRR scheduler once they have a negative 4113 * deficit. A station that already has a negative deficit will 4114 * get immediately moved to the back of the list on the next 4115 * call to ieee80211_next_txq(). 4116 */ 4117 if (txqi->txq.sta && local->airtime_flags && has_queue && 4118 wiphy_ext_feature_isset(local->hw.wiphy, 4119 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4120 list_add(&txqi->schedule_order, 4121 &local->active_txqs[txq->ac]); 4122 else 4123 list_add_tail(&txqi->schedule_order, 4124 &local->active_txqs[txq->ac]); 4125 if (has_queue) 4126 ieee80211_txq_set_active(txqi); 4127 } 4128 4129 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4130 } 4131 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4132 4133 DEFINE_STATIC_KEY_FALSE(aql_disable); 4134 4135 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4136 struct ieee80211_txq *txq) 4137 { 4138 struct sta_info *sta; 4139 struct ieee80211_local *local = hw_to_local(hw); 4140 4141 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4142 return true; 4143 4144 if (static_branch_unlikely(&aql_disable)) 4145 return true; 4146 4147 if (!txq->sta) 4148 return true; 4149 4150 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4151 return true; 4152 4153 sta = container_of(txq->sta, struct sta_info, sta); 4154 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4155 sta->airtime[txq->ac].aql_limit_low) 4156 return true; 4157 4158 if (atomic_read(&local->aql_total_pending_airtime) < 4159 local->aql_threshold && 4160 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4161 sta->airtime[txq->ac].aql_limit_high) 4162 return true; 4163 4164 return false; 4165 } 4166 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4167 4168 static bool 4169 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4170 { 4171 unsigned int num_txq = 0; 4172 struct txq_info *txq; 4173 u32 aql_limit; 4174 4175 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4176 return true; 4177 4178 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4179 num_txq++; 4180 4181 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4182 local->aql_txq_limit_high[ac]; 4183 4184 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4185 } 4186 4187 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4188 struct ieee80211_txq *txq) 4189 { 4190 struct ieee80211_local *local = hw_to_local(hw); 4191 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4192 struct sta_info *sta; 4193 u8 ac = txq->ac; 4194 4195 spin_lock_bh(&local->active_txq_lock[ac]); 4196 4197 if (!txqi->txq.sta) 4198 goto out; 4199 4200 if (list_empty(&txqi->schedule_order)) 4201 goto out; 4202 4203 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4204 goto out; 4205 4206 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4207 schedule_order) { 4208 if (iter == txqi) 4209 break; 4210 4211 if (!iter->txq.sta) { 4212 list_move_tail(&iter->schedule_order, 4213 &local->active_txqs[ac]); 4214 continue; 4215 } 4216 sta = container_of(iter->txq.sta, struct sta_info, sta); 4217 if (ieee80211_sta_deficit(sta, ac) < 0) 4218 sta->airtime[ac].deficit += sta->airtime_weight; 4219 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4220 } 4221 4222 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4223 if (sta->airtime[ac].deficit >= 0) 4224 goto out; 4225 4226 sta->airtime[ac].deficit += sta->airtime_weight; 4227 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4228 spin_unlock_bh(&local->active_txq_lock[ac]); 4229 4230 return false; 4231 out: 4232 if (!list_empty(&txqi->schedule_order)) 4233 list_del_init(&txqi->schedule_order); 4234 spin_unlock_bh(&local->active_txq_lock[ac]); 4235 4236 return true; 4237 } 4238 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4239 4240 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4241 { 4242 struct ieee80211_local *local = hw_to_local(hw); 4243 4244 spin_lock_bh(&local->active_txq_lock[ac]); 4245 4246 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4247 local->schedule_round[ac]++; 4248 if (!local->schedule_round[ac]) 4249 local->schedule_round[ac]++; 4250 } else { 4251 local->schedule_round[ac] = 0; 4252 } 4253 4254 spin_unlock_bh(&local->active_txq_lock[ac]); 4255 } 4256 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4257 4258 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4259 struct net_device *dev, 4260 u32 info_flags, 4261 u32 ctrl_flags, 4262 u64 *cookie) 4263 { 4264 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4265 struct ieee80211_local *local = sdata->local; 4266 struct sta_info *sta; 4267 struct sk_buff *next; 4268 int len = skb->len; 4269 4270 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4271 kfree_skb(skb); 4272 return; 4273 } 4274 4275 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4276 4277 rcu_read_lock(); 4278 4279 if (ieee80211_vif_is_mesh(&sdata->vif) && 4280 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4281 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4282 goto out; 4283 4284 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4285 goto out_free; 4286 4287 if (IS_ERR(sta)) 4288 sta = NULL; 4289 4290 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4291 ieee80211_aggr_check(sdata, sta, skb); 4292 4293 if (sta) { 4294 struct ieee80211_fast_tx *fast_tx; 4295 4296 fast_tx = rcu_dereference(sta->fast_tx); 4297 4298 if (fast_tx && 4299 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4300 goto out; 4301 } 4302 4303 /* the frame could be fragmented, software-encrypted, and other 4304 * things so we cannot really handle checksum or GSO offload. 4305 * fix it up in software before we handle anything else. 4306 */ 4307 skb = ieee80211_tx_skb_fixup(skb, 0); 4308 if (!skb) { 4309 len = 0; 4310 goto out; 4311 } 4312 4313 skb_list_walk_safe(skb, skb, next) { 4314 skb_mark_not_on_list(skb); 4315 4316 if (skb->protocol == sdata->control_port_protocol) 4317 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4318 4319 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4320 sta, ctrl_flags, cookie); 4321 if (IS_ERR(skb)) { 4322 kfree_skb_list(next); 4323 goto out; 4324 } 4325 4326 dev_sw_netstats_tx_add(dev, 1, skb->len); 4327 4328 ieee80211_xmit(sdata, sta, skb); 4329 } 4330 goto out; 4331 out_free: 4332 kfree_skb(skb); 4333 len = 0; 4334 out: 4335 if (len) 4336 ieee80211_tpt_led_trig_tx(local, len); 4337 rcu_read_unlock(); 4338 } 4339 4340 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4341 { 4342 struct ethhdr *eth; 4343 int err; 4344 4345 err = skb_ensure_writable(skb, ETH_HLEN); 4346 if (unlikely(err)) 4347 return err; 4348 4349 eth = (void *)skb->data; 4350 ether_addr_copy(eth->h_dest, sta->sta.addr); 4351 4352 return 0; 4353 } 4354 4355 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4356 struct net_device *dev) 4357 { 4358 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4359 const struct ethhdr *eth = (void *)skb->data; 4360 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4361 __be16 ethertype; 4362 4363 switch (sdata->vif.type) { 4364 case NL80211_IFTYPE_AP_VLAN: 4365 if (sdata->u.vlan.sta) 4366 return false; 4367 if (sdata->wdev.use_4addr) 4368 return false; 4369 fallthrough; 4370 case NL80211_IFTYPE_AP: 4371 /* check runtime toggle for this bss */ 4372 if (!sdata->bss->multicast_to_unicast) 4373 return false; 4374 break; 4375 default: 4376 return false; 4377 } 4378 4379 /* multicast to unicast conversion only for some payload */ 4380 ethertype = eth->h_proto; 4381 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4382 ethertype = ethvlan->h_vlan_encapsulated_proto; 4383 switch (ethertype) { 4384 case htons(ETH_P_ARP): 4385 case htons(ETH_P_IP): 4386 case htons(ETH_P_IPV6): 4387 break; 4388 default: 4389 return false; 4390 } 4391 4392 return true; 4393 } 4394 4395 static void 4396 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4397 struct sk_buff_head *queue) 4398 { 4399 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4400 struct ieee80211_local *local = sdata->local; 4401 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4402 struct sta_info *sta, *first = NULL; 4403 struct sk_buff *cloned_skb; 4404 4405 rcu_read_lock(); 4406 4407 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4408 if (sdata != sta->sdata) 4409 /* AP-VLAN mismatch */ 4410 continue; 4411 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4412 /* do not send back to source */ 4413 continue; 4414 if (!first) { 4415 first = sta; 4416 continue; 4417 } 4418 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4419 if (!cloned_skb) 4420 goto multicast; 4421 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4422 dev_kfree_skb(cloned_skb); 4423 goto multicast; 4424 } 4425 __skb_queue_tail(queue, cloned_skb); 4426 } 4427 4428 if (likely(first)) { 4429 if (unlikely(ieee80211_change_da(skb, first))) 4430 goto multicast; 4431 __skb_queue_tail(queue, skb); 4432 } else { 4433 /* no STA connected, drop */ 4434 kfree_skb(skb); 4435 skb = NULL; 4436 } 4437 4438 goto out; 4439 multicast: 4440 __skb_queue_purge(queue); 4441 __skb_queue_tail(queue, skb); 4442 out: 4443 rcu_read_unlock(); 4444 } 4445 4446 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4447 struct sk_buff *skb, u32 ctrl_flags, 4448 unsigned int link_id) 4449 { 4450 struct sk_buff *out; 4451 4452 out = skb_copy(skb, GFP_ATOMIC); 4453 if (!out) 4454 return; 4455 4456 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4457 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4458 } 4459 4460 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4461 struct sk_buff *skb) 4462 { 4463 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4464 unsigned long links = sdata->vif.active_links; 4465 unsigned int link; 4466 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4467 4468 if (hweight16(links) == 1) { 4469 ctrl_flags |= u32_encode_bits(__ffs(links), 4470 IEEE80211_TX_CTRL_MLO_LINK); 4471 4472 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4473 NULL); 4474 return; 4475 } 4476 4477 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4478 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4479 ctrl_flags = 0; 4480 } 4481 kfree_skb(skb); 4482 } 4483 4484 /** 4485 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4486 * @skb: packet to be sent 4487 * @dev: incoming interface 4488 * 4489 * On failure skb will be freed. 4490 * 4491 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4492 */ 4493 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4494 struct net_device *dev) 4495 { 4496 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4497 const struct ethhdr *eth = (void *)skb->data; 4498 4499 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4500 goto normal; 4501 4502 if (unlikely(!ieee80211_sdata_running(sdata))) { 4503 kfree_skb(skb); 4504 return NETDEV_TX_OK; 4505 } 4506 4507 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4508 struct sk_buff_head queue; 4509 4510 __skb_queue_head_init(&queue); 4511 ieee80211_convert_to_unicast(skb, dev, &queue); 4512 while ((skb = __skb_dequeue(&queue))) 4513 __ieee80211_subif_start_xmit(skb, dev, 0, 4514 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4515 NULL); 4516 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4517 sdata->vif.type == NL80211_IFTYPE_AP && 4518 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4519 ieee80211_mlo_multicast_tx(dev, skb); 4520 } else { 4521 normal: 4522 __ieee80211_subif_start_xmit(skb, dev, 0, 4523 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4524 NULL); 4525 } 4526 4527 return NETDEV_TX_OK; 4528 } 4529 4530 4531 4532 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4533 struct sk_buff *skb, struct sta_info *sta, 4534 bool txpending) 4535 { 4536 struct ieee80211_local *local = sdata->local; 4537 struct ieee80211_tx_control control = {}; 4538 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4539 struct ieee80211_sta *pubsta = NULL; 4540 unsigned long flags; 4541 int q = info->hw_queue; 4542 4543 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4544 4545 if (local->queue_stop_reasons[q] || 4546 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4547 if (txpending) 4548 skb_queue_head(&local->pending[q], skb); 4549 else 4550 skb_queue_tail(&local->pending[q], skb); 4551 4552 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4553 4554 return false; 4555 } 4556 4557 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4558 4559 if (sta && sta->uploaded) 4560 pubsta = &sta->sta; 4561 4562 control.sta = pubsta; 4563 4564 drv_tx(local, &control, skb); 4565 4566 return true; 4567 } 4568 4569 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4570 struct sk_buff *skb, struct sta_info *sta, 4571 bool txpending) 4572 { 4573 struct ieee80211_local *local = sdata->local; 4574 struct sk_buff *next; 4575 bool ret = true; 4576 4577 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4578 return true; 4579 4580 skb_list_walk_safe(skb, skb, next) { 4581 skb_mark_not_on_list(skb); 4582 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4583 ret = false; 4584 } 4585 4586 return ret; 4587 } 4588 4589 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4590 struct net_device *dev, struct sta_info *sta, 4591 struct ieee80211_key *key, struct sk_buff *skb) 4592 { 4593 struct ieee80211_tx_info *info; 4594 struct ieee80211_local *local = sdata->local; 4595 struct tid_ampdu_tx *tid_tx; 4596 struct sk_buff *seg, *next; 4597 unsigned int skbs = 0, len = 0; 4598 u16 queue; 4599 u8 tid; 4600 4601 queue = ieee80211_select_queue(sdata, sta, skb); 4602 skb_set_queue_mapping(skb, queue); 4603 4604 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4605 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4606 goto out_free; 4607 4608 skb = skb_share_check(skb, GFP_ATOMIC); 4609 if (unlikely(!skb)) 4610 return; 4611 4612 ieee80211_aggr_check(sdata, sta, skb); 4613 4614 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4615 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4616 if (tid_tx) { 4617 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4618 /* fall back to non-offload slow path */ 4619 __ieee80211_subif_start_xmit(skb, dev, 0, 4620 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4621 NULL); 4622 return; 4623 } 4624 4625 if (tid_tx->timeout) 4626 tid_tx->last_tx = jiffies; 4627 } 4628 4629 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4630 if (!skb) 4631 return; 4632 4633 info = IEEE80211_SKB_CB(skb); 4634 memset(info, 0, sizeof(*info)); 4635 4636 info->hw_queue = sdata->vif.hw_queue[queue]; 4637 4638 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4639 sdata = container_of(sdata->bss, 4640 struct ieee80211_sub_if_data, u.ap); 4641 4642 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4643 info->control.vif = &sdata->vif; 4644 4645 if (key) 4646 info->control.hw_key = &key->conf; 4647 4648 skb_list_walk_safe(skb, seg, next) { 4649 skbs++; 4650 len += seg->len; 4651 if (seg != skb) 4652 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4653 } 4654 4655 if (unlikely(skb->sk && 4656 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 4657 info->status_data = ieee80211_store_ack_skb(local, skb, 4658 &info->flags, NULL); 4659 if (info->status_data) 4660 info->status_data_idr = 1; 4661 } 4662 4663 dev_sw_netstats_tx_add(dev, skbs, len); 4664 sta->deflink.tx_stats.packets[queue] += skbs; 4665 sta->deflink.tx_stats.bytes[queue] += len; 4666 4667 ieee80211_tpt_led_trig_tx(local, len); 4668 4669 ieee80211_tx_8023(sdata, skb, sta, false); 4670 4671 return; 4672 4673 out_free: 4674 kfree_skb(skb); 4675 } 4676 4677 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4678 struct net_device *dev) 4679 { 4680 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4681 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4682 struct ieee80211_key *key; 4683 struct sta_info *sta; 4684 4685 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4686 kfree_skb(skb); 4687 return NETDEV_TX_OK; 4688 } 4689 4690 rcu_read_lock(); 4691 4692 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4693 kfree_skb(skb); 4694 goto out; 4695 } 4696 4697 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4698 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4699 sdata->control_port_protocol == ehdr->h_proto)) 4700 goto skip_offload; 4701 4702 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4703 if (!key) 4704 key = rcu_dereference(sdata->default_unicast_key); 4705 4706 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4707 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4708 goto skip_offload; 4709 4710 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4711 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4712 goto out; 4713 4714 skip_offload: 4715 ieee80211_subif_start_xmit(skb, dev); 4716 out: 4717 rcu_read_unlock(); 4718 4719 return NETDEV_TX_OK; 4720 } 4721 4722 struct sk_buff * 4723 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4724 struct sk_buff *skb, u32 info_flags) 4725 { 4726 struct ieee80211_hdr *hdr; 4727 struct ieee80211_tx_data tx = { 4728 .local = sdata->local, 4729 .sdata = sdata, 4730 }; 4731 struct sta_info *sta; 4732 4733 rcu_read_lock(); 4734 4735 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4736 kfree_skb(skb); 4737 skb = ERR_PTR(-EINVAL); 4738 goto out; 4739 } 4740 4741 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4742 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4743 if (IS_ERR(skb)) 4744 goto out; 4745 4746 hdr = (void *)skb->data; 4747 tx.sta = sta_info_get(sdata, hdr->addr1); 4748 tx.skb = skb; 4749 4750 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4751 rcu_read_unlock(); 4752 kfree_skb(skb); 4753 return ERR_PTR(-EINVAL); 4754 } 4755 4756 out: 4757 rcu_read_unlock(); 4758 return skb; 4759 } 4760 4761 /* 4762 * ieee80211_clear_tx_pending may not be called in a context where 4763 * it is possible that it packets could come in again. 4764 */ 4765 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4766 { 4767 struct sk_buff *skb; 4768 int i; 4769 4770 for (i = 0; i < local->hw.queues; i++) { 4771 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4772 ieee80211_free_txskb(&local->hw, skb); 4773 } 4774 } 4775 4776 /* 4777 * Returns false if the frame couldn't be transmitted but was queued instead, 4778 * which in this case means re-queued -- take as an indication to stop sending 4779 * more pending frames. 4780 */ 4781 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4782 struct sk_buff *skb) 4783 { 4784 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4785 struct ieee80211_sub_if_data *sdata; 4786 struct sta_info *sta; 4787 struct ieee80211_hdr *hdr; 4788 bool result; 4789 struct ieee80211_chanctx_conf *chanctx_conf; 4790 4791 sdata = vif_to_sdata(info->control.vif); 4792 4793 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4794 /* update band only for non-MLD */ 4795 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4796 chanctx_conf = 4797 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4798 if (unlikely(!chanctx_conf)) { 4799 dev_kfree_skb(skb); 4800 return true; 4801 } 4802 info->band = chanctx_conf->def.chan->band; 4803 } 4804 result = ieee80211_tx(sdata, NULL, skb, true); 4805 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4806 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4807 dev_kfree_skb(skb); 4808 return true; 4809 } 4810 4811 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4812 sta = NULL; 4813 4814 result = ieee80211_tx_8023(sdata, skb, sta, true); 4815 } else { 4816 struct sk_buff_head skbs; 4817 4818 __skb_queue_head_init(&skbs); 4819 __skb_queue_tail(&skbs, skb); 4820 4821 hdr = (struct ieee80211_hdr *)skb->data; 4822 sta = sta_info_get(sdata, hdr->addr1); 4823 4824 result = __ieee80211_tx(local, &skbs, sta, true); 4825 } 4826 4827 return result; 4828 } 4829 4830 /* 4831 * Transmit all pending packets. Called from tasklet. 4832 */ 4833 void ieee80211_tx_pending(struct tasklet_struct *t) 4834 { 4835 struct ieee80211_local *local = from_tasklet(local, t, 4836 tx_pending_tasklet); 4837 unsigned long flags; 4838 int i; 4839 bool txok; 4840 4841 rcu_read_lock(); 4842 4843 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4844 for (i = 0; i < local->hw.queues; i++) { 4845 /* 4846 * If queue is stopped by something other than due to pending 4847 * frames, or we have no pending frames, proceed to next queue. 4848 */ 4849 if (local->queue_stop_reasons[i] || 4850 skb_queue_empty(&local->pending[i])) 4851 continue; 4852 4853 while (!skb_queue_empty(&local->pending[i])) { 4854 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4855 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4856 4857 if (WARN_ON(!info->control.vif)) { 4858 ieee80211_free_txskb(&local->hw, skb); 4859 continue; 4860 } 4861 4862 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4863 flags); 4864 4865 txok = ieee80211_tx_pending_skb(local, skb); 4866 spin_lock_irqsave(&local->queue_stop_reason_lock, 4867 flags); 4868 if (!txok) 4869 break; 4870 } 4871 } 4872 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4873 4874 rcu_read_unlock(); 4875 } 4876 4877 /* functions for drivers to get certain frames */ 4878 4879 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4880 struct ieee80211_link_data *link, 4881 struct ps_data *ps, struct sk_buff *skb, 4882 bool is_template) 4883 { 4884 u8 *pos, *tim; 4885 int aid0 = 0; 4886 int i, have_bits = 0, n1, n2; 4887 struct ieee80211_bss_conf *link_conf = link->conf; 4888 4889 /* Generate bitmap for TIM only if there are any STAs in power save 4890 * mode. */ 4891 if (atomic_read(&ps->num_sta_ps) > 0) 4892 /* in the hope that this is faster than 4893 * checking byte-for-byte */ 4894 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4895 IEEE80211_MAX_AID+1); 4896 if (!is_template) { 4897 if (ps->dtim_count == 0) 4898 ps->dtim_count = link_conf->dtim_period - 1; 4899 else 4900 ps->dtim_count--; 4901 } 4902 4903 tim = pos = skb_put(skb, 5); 4904 *pos++ = WLAN_EID_TIM; 4905 *pos++ = 3; 4906 *pos++ = ps->dtim_count; 4907 *pos++ = link_conf->dtim_period; 4908 4909 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4910 aid0 = 1; 4911 4912 ps->dtim_bc_mc = aid0 == 1; 4913 4914 if (have_bits) { 4915 /* Find largest even number N1 so that bits numbered 1 through 4916 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4917 * (N2 + 1) x 8 through 2007 are 0. */ 4918 n1 = 0; 4919 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4920 if (ps->tim[i]) { 4921 n1 = i & 0xfe; 4922 break; 4923 } 4924 } 4925 n2 = n1; 4926 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4927 if (ps->tim[i]) { 4928 n2 = i; 4929 break; 4930 } 4931 } 4932 4933 /* Bitmap control */ 4934 *pos++ = n1 | aid0; 4935 /* Part Virt Bitmap */ 4936 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4937 4938 tim[1] = n2 - n1 + 4; 4939 } else { 4940 *pos++ = aid0; /* Bitmap control */ 4941 4942 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4943 tim[1] = 4; 4944 /* Part Virt Bitmap */ 4945 skb_put_u8(skb, 0); 4946 } 4947 } 4948 } 4949 4950 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4951 struct ieee80211_link_data *link, 4952 struct ps_data *ps, struct sk_buff *skb, 4953 bool is_template) 4954 { 4955 struct ieee80211_local *local = sdata->local; 4956 4957 /* 4958 * Not very nice, but we want to allow the driver to call 4959 * ieee80211_beacon_get() as a response to the set_tim() 4960 * callback. That, however, is already invoked under the 4961 * sta_lock to guarantee consistent and race-free update 4962 * of the tim bitmap in mac80211 and the driver. 4963 */ 4964 if (local->tim_in_locked_section) { 4965 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4966 } else { 4967 spin_lock_bh(&local->tim_lock); 4968 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4969 spin_unlock_bh(&local->tim_lock); 4970 } 4971 4972 return 0; 4973 } 4974 4975 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4976 struct beacon_data *beacon, 4977 struct ieee80211_link_data *link) 4978 { 4979 u8 *beacon_data, count, max_count = 1; 4980 struct probe_resp *resp; 4981 size_t beacon_data_len; 4982 u16 *bcn_offsets; 4983 int i; 4984 4985 switch (sdata->vif.type) { 4986 case NL80211_IFTYPE_AP: 4987 beacon_data = beacon->tail; 4988 beacon_data_len = beacon->tail_len; 4989 break; 4990 case NL80211_IFTYPE_ADHOC: 4991 beacon_data = beacon->head; 4992 beacon_data_len = beacon->head_len; 4993 break; 4994 case NL80211_IFTYPE_MESH_POINT: 4995 beacon_data = beacon->head; 4996 beacon_data_len = beacon->head_len; 4997 break; 4998 default: 4999 return; 5000 } 5001 5002 resp = rcu_dereference(link->u.ap.probe_resp); 5003 5004 bcn_offsets = beacon->cntdwn_counter_offsets; 5005 count = beacon->cntdwn_current_counter; 5006 if (link->conf->csa_active) 5007 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5008 5009 for (i = 0; i < max_count; ++i) { 5010 if (bcn_offsets[i]) { 5011 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5012 return; 5013 beacon_data[bcn_offsets[i]] = count; 5014 } 5015 5016 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5017 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5018 5019 resp->data[resp_offsets[i]] = count; 5020 } 5021 } 5022 } 5023 5024 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 5025 { 5026 beacon->cntdwn_current_counter--; 5027 5028 /* the counter should never reach 0 */ 5029 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 5030 5031 return beacon->cntdwn_current_counter; 5032 } 5033 5034 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 5035 { 5036 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5037 struct beacon_data *beacon = NULL; 5038 u8 count = 0; 5039 5040 rcu_read_lock(); 5041 5042 if (sdata->vif.type == NL80211_IFTYPE_AP) 5043 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5044 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5045 beacon = rcu_dereference(sdata->u.ibss.presp); 5046 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5047 beacon = rcu_dereference(sdata->u.mesh.beacon); 5048 5049 if (!beacon) 5050 goto unlock; 5051 5052 count = __ieee80211_beacon_update_cntdwn(beacon); 5053 5054 unlock: 5055 rcu_read_unlock(); 5056 return count; 5057 } 5058 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5059 5060 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5061 { 5062 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5063 struct beacon_data *beacon = NULL; 5064 5065 rcu_read_lock(); 5066 5067 if (sdata->vif.type == NL80211_IFTYPE_AP) 5068 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5069 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5070 beacon = rcu_dereference(sdata->u.ibss.presp); 5071 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5072 beacon = rcu_dereference(sdata->u.mesh.beacon); 5073 5074 if (!beacon) 5075 goto unlock; 5076 5077 if (counter < beacon->cntdwn_current_counter) 5078 beacon->cntdwn_current_counter = counter; 5079 5080 unlock: 5081 rcu_read_unlock(); 5082 } 5083 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5084 5085 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 5086 { 5087 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5088 struct beacon_data *beacon = NULL; 5089 u8 *beacon_data; 5090 size_t beacon_data_len; 5091 int ret = false; 5092 5093 if (!ieee80211_sdata_running(sdata)) 5094 return false; 5095 5096 rcu_read_lock(); 5097 if (vif->type == NL80211_IFTYPE_AP) { 5098 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5099 if (WARN_ON(!beacon || !beacon->tail)) 5100 goto out; 5101 beacon_data = beacon->tail; 5102 beacon_data_len = beacon->tail_len; 5103 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5104 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5105 5106 beacon = rcu_dereference(ifibss->presp); 5107 if (!beacon) 5108 goto out; 5109 5110 beacon_data = beacon->head; 5111 beacon_data_len = beacon->head_len; 5112 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5113 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5114 5115 beacon = rcu_dereference(ifmsh->beacon); 5116 if (!beacon) 5117 goto out; 5118 5119 beacon_data = beacon->head; 5120 beacon_data_len = beacon->head_len; 5121 } else { 5122 WARN_ON(1); 5123 goto out; 5124 } 5125 5126 if (!beacon->cntdwn_counter_offsets[0]) 5127 goto out; 5128 5129 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5130 goto out; 5131 5132 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5133 ret = true; 5134 5135 out: 5136 rcu_read_unlock(); 5137 5138 return ret; 5139 } 5140 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5141 5142 static int ieee80211_beacon_protect(struct sk_buff *skb, 5143 struct ieee80211_local *local, 5144 struct ieee80211_sub_if_data *sdata, 5145 struct ieee80211_link_data *link) 5146 { 5147 ieee80211_tx_result res; 5148 struct ieee80211_tx_data tx; 5149 struct sk_buff *check_skb; 5150 5151 memset(&tx, 0, sizeof(tx)); 5152 tx.key = rcu_dereference(link->default_beacon_key); 5153 if (!tx.key) 5154 return 0; 5155 5156 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5157 tx.key = NULL; 5158 return -EINVAL; 5159 } 5160 5161 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5162 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5163 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5164 5165 tx.local = local; 5166 tx.sdata = sdata; 5167 __skb_queue_head_init(&tx.skbs); 5168 __skb_queue_tail(&tx.skbs, skb); 5169 res = ieee80211_tx_h_encrypt(&tx); 5170 check_skb = __skb_dequeue(&tx.skbs); 5171 /* we may crash after this, but it'd be a bug in crypto */ 5172 WARN_ON(check_skb != skb); 5173 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5174 return -EINVAL; 5175 5176 return 0; 5177 } 5178 5179 static void 5180 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5181 struct ieee80211_vif *vif, 5182 struct ieee80211_link_data *link, 5183 struct ieee80211_mutable_offsets *offs, 5184 struct beacon_data *beacon, 5185 struct sk_buff *skb, 5186 struct ieee80211_chanctx_conf *chanctx_conf, 5187 u16 csa_off_base) 5188 { 5189 struct ieee80211_local *local = hw_to_local(hw); 5190 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5191 struct ieee80211_tx_info *info; 5192 enum nl80211_band band; 5193 struct ieee80211_tx_rate_control txrc; 5194 5195 /* CSA offsets */ 5196 if (offs && beacon) { 5197 u16 i; 5198 5199 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5200 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5201 5202 if (!csa_off) 5203 continue; 5204 5205 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5206 } 5207 } 5208 5209 band = chanctx_conf->def.chan->band; 5210 info = IEEE80211_SKB_CB(skb); 5211 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5212 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5213 info->band = band; 5214 5215 memset(&txrc, 0, sizeof(txrc)); 5216 txrc.hw = hw; 5217 txrc.sband = local->hw.wiphy->bands[band]; 5218 txrc.bss_conf = link->conf; 5219 txrc.skb = skb; 5220 txrc.reported_rate.idx = -1; 5221 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5222 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5223 else 5224 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5225 txrc.bss = true; 5226 rate_control_get_rate(sdata, NULL, &txrc); 5227 5228 info->control.vif = vif; 5229 info->control.flags |= u32_encode_bits(link->link_id, 5230 IEEE80211_TX_CTRL_MLO_LINK); 5231 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5232 IEEE80211_TX_CTL_ASSIGN_SEQ | 5233 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5234 } 5235 5236 static void 5237 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5238 u8 i) 5239 { 5240 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5241 i > beacon->mbssid_ies->cnt) 5242 return; 5243 5244 if (i < beacon->mbssid_ies->cnt) { 5245 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5246 beacon->mbssid_ies->elem[i].len); 5247 5248 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5249 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5250 beacon->rnr_ies->elem[i].len); 5251 5252 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5253 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5254 beacon->rnr_ies->elem[i].len); 5255 } 5256 return; 5257 } 5258 5259 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5260 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5261 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5262 beacon->mbssid_ies->elem[i].len); 5263 } 5264 5265 static struct sk_buff * 5266 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5267 struct ieee80211_vif *vif, 5268 struct ieee80211_link_data *link, 5269 struct ieee80211_mutable_offsets *offs, 5270 bool is_template, 5271 struct beacon_data *beacon, 5272 struct ieee80211_chanctx_conf *chanctx_conf, 5273 u8 ema_index) 5274 { 5275 struct ieee80211_local *local = hw_to_local(hw); 5276 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5277 struct ieee80211_if_ap *ap = &sdata->u.ap; 5278 struct sk_buff *skb = NULL; 5279 u16 csa_off_base = 0; 5280 int mbssid_len; 5281 5282 if (beacon->cntdwn_counter_offsets[0]) { 5283 if (!is_template) 5284 ieee80211_beacon_update_cntdwn(vif); 5285 5286 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5287 } 5288 5289 /* headroom, head length, 5290 * tail length, maximum TIM length and multiple BSSID length 5291 */ 5292 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5293 beacon->rnr_ies, 5294 ema_index); 5295 5296 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5297 beacon->tail_len + 256 + 5298 local->hw.extra_beacon_tailroom + mbssid_len); 5299 if (!skb) 5300 return NULL; 5301 5302 skb_reserve(skb, local->tx_headroom); 5303 skb_put_data(skb, beacon->head, beacon->head_len); 5304 5305 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5306 5307 if (offs) { 5308 offs->tim_offset = beacon->head_len; 5309 offs->tim_length = skb->len - beacon->head_len; 5310 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5311 5312 if (mbssid_len) { 5313 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5314 offs->mbssid_off = skb->len - mbssid_len; 5315 } 5316 5317 /* for AP the csa offsets are from tail */ 5318 csa_off_base = skb->len; 5319 } 5320 5321 if (beacon->tail) 5322 skb_put_data(skb, beacon->tail, beacon->tail_len); 5323 5324 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5325 return NULL; 5326 5327 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5328 chanctx_conf, csa_off_base); 5329 return skb; 5330 } 5331 5332 static struct ieee80211_ema_beacons * 5333 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5334 struct ieee80211_vif *vif, 5335 struct ieee80211_link_data *link, 5336 struct ieee80211_mutable_offsets *offs, 5337 bool is_template, struct beacon_data *beacon, 5338 struct ieee80211_chanctx_conf *chanctx_conf) 5339 { 5340 struct ieee80211_ema_beacons *ema = NULL; 5341 5342 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5343 return NULL; 5344 5345 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5346 GFP_ATOMIC); 5347 if (!ema) 5348 return NULL; 5349 5350 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5351 ema->bcn[ema->cnt].skb = 5352 ieee80211_beacon_get_ap(hw, vif, link, 5353 &ema->bcn[ema->cnt].offs, 5354 is_template, beacon, 5355 chanctx_conf, ema->cnt); 5356 if (!ema->bcn[ema->cnt].skb) 5357 break; 5358 } 5359 5360 if (ema->cnt == beacon->mbssid_ies->cnt) 5361 return ema; 5362 5363 ieee80211_beacon_free_ema_list(ema); 5364 return NULL; 5365 } 5366 5367 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5368 5369 static struct sk_buff * 5370 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5371 struct ieee80211_vif *vif, 5372 struct ieee80211_mutable_offsets *offs, 5373 bool is_template, 5374 unsigned int link_id, 5375 int ema_index, 5376 struct ieee80211_ema_beacons **ema_beacons) 5377 { 5378 struct ieee80211_local *local = hw_to_local(hw); 5379 struct beacon_data *beacon = NULL; 5380 struct sk_buff *skb = NULL; 5381 struct ieee80211_sub_if_data *sdata = NULL; 5382 struct ieee80211_chanctx_conf *chanctx_conf; 5383 struct ieee80211_link_data *link; 5384 5385 rcu_read_lock(); 5386 5387 sdata = vif_to_sdata(vif); 5388 link = rcu_dereference(sdata->link[link_id]); 5389 if (!link) 5390 goto out; 5391 chanctx_conf = 5392 rcu_dereference(link->conf->chanctx_conf); 5393 5394 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5395 goto out; 5396 5397 if (offs) 5398 memset(offs, 0, sizeof(*offs)); 5399 5400 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5401 beacon = rcu_dereference(link->u.ap.beacon); 5402 if (!beacon) 5403 goto out; 5404 5405 if (ema_beacons) { 5406 *ema_beacons = 5407 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5408 offs, 5409 is_template, 5410 beacon, 5411 chanctx_conf); 5412 } else { 5413 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5414 if (ema_index >= beacon->mbssid_ies->cnt) 5415 goto out; /* End of MBSSID elements */ 5416 5417 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5418 ema_index = beacon->mbssid_ies->cnt; 5419 } else { 5420 ema_index = 0; 5421 } 5422 5423 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5424 is_template, beacon, 5425 chanctx_conf, 5426 ema_index); 5427 } 5428 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5429 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5430 struct ieee80211_hdr *hdr; 5431 5432 beacon = rcu_dereference(ifibss->presp); 5433 if (!beacon) 5434 goto out; 5435 5436 if (beacon->cntdwn_counter_offsets[0]) { 5437 if (!is_template) 5438 __ieee80211_beacon_update_cntdwn(beacon); 5439 5440 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5441 } 5442 5443 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5444 local->hw.extra_beacon_tailroom); 5445 if (!skb) 5446 goto out; 5447 skb_reserve(skb, local->tx_headroom); 5448 skb_put_data(skb, beacon->head, beacon->head_len); 5449 5450 hdr = (struct ieee80211_hdr *) skb->data; 5451 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5452 IEEE80211_STYPE_BEACON); 5453 5454 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5455 chanctx_conf, 0); 5456 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5457 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5458 5459 beacon = rcu_dereference(ifmsh->beacon); 5460 if (!beacon) 5461 goto out; 5462 5463 if (beacon->cntdwn_counter_offsets[0]) { 5464 if (!is_template) 5465 /* TODO: For mesh csa_counter is in TU, so 5466 * decrementing it by one isn't correct, but 5467 * for now we leave it consistent with overall 5468 * mac80211's behavior. 5469 */ 5470 __ieee80211_beacon_update_cntdwn(beacon); 5471 5472 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5473 } 5474 5475 if (ifmsh->sync_ops) 5476 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5477 5478 skb = dev_alloc_skb(local->tx_headroom + 5479 beacon->head_len + 5480 256 + /* TIM IE */ 5481 beacon->tail_len + 5482 local->hw.extra_beacon_tailroom); 5483 if (!skb) 5484 goto out; 5485 skb_reserve(skb, local->tx_headroom); 5486 skb_put_data(skb, beacon->head, beacon->head_len); 5487 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5488 is_template); 5489 5490 if (offs) { 5491 offs->tim_offset = beacon->head_len; 5492 offs->tim_length = skb->len - beacon->head_len; 5493 } 5494 5495 skb_put_data(skb, beacon->tail, beacon->tail_len); 5496 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5497 chanctx_conf, 0); 5498 } else { 5499 WARN_ON(1); 5500 goto out; 5501 } 5502 5503 out: 5504 rcu_read_unlock(); 5505 return skb; 5506 5507 } 5508 5509 struct sk_buff * 5510 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5511 struct ieee80211_vif *vif, 5512 struct ieee80211_mutable_offsets *offs, 5513 unsigned int link_id) 5514 { 5515 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5516 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5517 } 5518 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5519 5520 struct sk_buff * 5521 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5522 struct ieee80211_vif *vif, 5523 struct ieee80211_mutable_offsets *offs, 5524 unsigned int link_id, u8 ema_index) 5525 { 5526 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5527 NULL); 5528 } 5529 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5530 5531 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5532 { 5533 u8 i; 5534 5535 if (!ema_beacons) 5536 return; 5537 5538 for (i = 0; i < ema_beacons->cnt; i++) 5539 kfree_skb(ema_beacons->bcn[i].skb); 5540 5541 kfree(ema_beacons); 5542 } 5543 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5544 5545 struct ieee80211_ema_beacons * 5546 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5547 struct ieee80211_vif *vif, 5548 unsigned int link_id) 5549 { 5550 struct ieee80211_ema_beacons *ema_beacons = NULL; 5551 5552 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5553 &ema_beacons)); 5554 5555 return ema_beacons; 5556 } 5557 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5558 5559 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5560 struct ieee80211_vif *vif, 5561 u16 *tim_offset, u16 *tim_length, 5562 unsigned int link_id) 5563 { 5564 struct ieee80211_mutable_offsets offs = {}; 5565 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5566 link_id, 5567 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5568 NULL); 5569 struct sk_buff *copy; 5570 5571 if (!bcn) 5572 return bcn; 5573 5574 if (tim_offset) 5575 *tim_offset = offs.tim_offset; 5576 5577 if (tim_length) 5578 *tim_length = offs.tim_length; 5579 5580 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5581 !hw_to_local(hw)->monitors) 5582 return bcn; 5583 5584 /* send a copy to monitor interfaces */ 5585 copy = skb_copy(bcn, GFP_ATOMIC); 5586 if (!copy) 5587 return bcn; 5588 5589 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, false, NULL); 5590 5591 return bcn; 5592 } 5593 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5594 5595 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5596 struct ieee80211_vif *vif) 5597 { 5598 struct sk_buff *skb = NULL; 5599 struct probe_resp *presp = NULL; 5600 struct ieee80211_hdr *hdr; 5601 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5602 5603 if (sdata->vif.type != NL80211_IFTYPE_AP) 5604 return NULL; 5605 5606 rcu_read_lock(); 5607 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5608 if (!presp) 5609 goto out; 5610 5611 skb = dev_alloc_skb(presp->len); 5612 if (!skb) 5613 goto out; 5614 5615 skb_put_data(skb, presp->data, presp->len); 5616 5617 hdr = (struct ieee80211_hdr *) skb->data; 5618 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5619 5620 out: 5621 rcu_read_unlock(); 5622 return skb; 5623 } 5624 EXPORT_SYMBOL(ieee80211_proberesp_get); 5625 5626 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5627 struct ieee80211_vif *vif) 5628 { 5629 struct sk_buff *skb = NULL; 5630 struct fils_discovery_data *tmpl = NULL; 5631 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5632 5633 if (sdata->vif.type != NL80211_IFTYPE_AP) 5634 return NULL; 5635 5636 rcu_read_lock(); 5637 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5638 if (!tmpl) { 5639 rcu_read_unlock(); 5640 return NULL; 5641 } 5642 5643 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5644 if (skb) { 5645 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5646 skb_put_data(skb, tmpl->data, tmpl->len); 5647 } 5648 5649 rcu_read_unlock(); 5650 return skb; 5651 } 5652 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5653 5654 struct sk_buff * 5655 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5656 struct ieee80211_vif *vif) 5657 { 5658 struct sk_buff *skb = NULL; 5659 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5660 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5661 5662 if (sdata->vif.type != NL80211_IFTYPE_AP) 5663 return NULL; 5664 5665 rcu_read_lock(); 5666 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5667 if (!tmpl) { 5668 rcu_read_unlock(); 5669 return NULL; 5670 } 5671 5672 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5673 if (skb) { 5674 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5675 skb_put_data(skb, tmpl->data, tmpl->len); 5676 } 5677 5678 rcu_read_unlock(); 5679 return skb; 5680 } 5681 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5682 5683 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5684 struct ieee80211_vif *vif) 5685 { 5686 struct ieee80211_sub_if_data *sdata; 5687 struct ieee80211_pspoll *pspoll; 5688 struct ieee80211_local *local; 5689 struct sk_buff *skb; 5690 5691 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5692 return NULL; 5693 5694 sdata = vif_to_sdata(vif); 5695 local = sdata->local; 5696 5697 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5698 if (!skb) 5699 return NULL; 5700 5701 skb_reserve(skb, local->hw.extra_tx_headroom); 5702 5703 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5704 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5705 IEEE80211_STYPE_PSPOLL); 5706 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5707 5708 /* aid in PS-Poll has its two MSBs each set to 1 */ 5709 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5710 5711 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5712 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5713 5714 return skb; 5715 } 5716 EXPORT_SYMBOL(ieee80211_pspoll_get); 5717 5718 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5719 struct ieee80211_vif *vif, 5720 int link_id, bool qos_ok) 5721 { 5722 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5723 struct ieee80211_local *local = sdata->local; 5724 struct ieee80211_link_data *link = NULL; 5725 struct ieee80211_hdr_3addr *nullfunc; 5726 struct sk_buff *skb; 5727 bool qos = false; 5728 5729 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5730 return NULL; 5731 5732 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5733 sizeof(*nullfunc) + 2); 5734 if (!skb) 5735 return NULL; 5736 5737 rcu_read_lock(); 5738 if (qos_ok) { 5739 struct sta_info *sta; 5740 5741 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5742 qos = sta && sta->sta.wme; 5743 } 5744 5745 if (link_id >= 0) { 5746 link = rcu_dereference(sdata->link[link_id]); 5747 if (WARN_ON_ONCE(!link)) { 5748 rcu_read_unlock(); 5749 kfree_skb(skb); 5750 return NULL; 5751 } 5752 } 5753 5754 skb_reserve(skb, local->hw.extra_tx_headroom); 5755 5756 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5757 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5758 IEEE80211_STYPE_NULLFUNC | 5759 IEEE80211_FCTL_TODS); 5760 if (qos) { 5761 __le16 qoshdr = cpu_to_le16(7); 5762 5763 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5764 IEEE80211_STYPE_NULLFUNC) != 5765 IEEE80211_STYPE_QOS_NULLFUNC); 5766 nullfunc->frame_control |= 5767 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5768 skb->priority = 7; 5769 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5770 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5771 } 5772 5773 if (link) { 5774 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5775 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5776 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5777 } else { 5778 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5779 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5780 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5781 } 5782 rcu_read_unlock(); 5783 5784 return skb; 5785 } 5786 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5787 5788 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5789 const u8 *src_addr, 5790 const u8 *ssid, size_t ssid_len, 5791 size_t tailroom) 5792 { 5793 struct ieee80211_local *local = hw_to_local(hw); 5794 struct ieee80211_hdr_3addr *hdr; 5795 struct sk_buff *skb; 5796 size_t ie_ssid_len; 5797 u8 *pos; 5798 5799 ie_ssid_len = 2 + ssid_len; 5800 5801 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5802 ie_ssid_len + tailroom); 5803 if (!skb) 5804 return NULL; 5805 5806 skb_reserve(skb, local->hw.extra_tx_headroom); 5807 5808 hdr = skb_put_zero(skb, sizeof(*hdr)); 5809 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5810 IEEE80211_STYPE_PROBE_REQ); 5811 eth_broadcast_addr(hdr->addr1); 5812 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5813 eth_broadcast_addr(hdr->addr3); 5814 5815 pos = skb_put(skb, ie_ssid_len); 5816 *pos++ = WLAN_EID_SSID; 5817 *pos++ = ssid_len; 5818 if (ssid_len) 5819 memcpy(pos, ssid, ssid_len); 5820 pos += ssid_len; 5821 5822 return skb; 5823 } 5824 EXPORT_SYMBOL(ieee80211_probereq_get); 5825 5826 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5827 const void *frame, size_t frame_len, 5828 const struct ieee80211_tx_info *frame_txctl, 5829 struct ieee80211_rts *rts) 5830 { 5831 const struct ieee80211_hdr *hdr = frame; 5832 5833 rts->frame_control = 5834 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5835 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5836 frame_txctl); 5837 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5838 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5839 } 5840 EXPORT_SYMBOL(ieee80211_rts_get); 5841 5842 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5843 const void *frame, size_t frame_len, 5844 const struct ieee80211_tx_info *frame_txctl, 5845 struct ieee80211_cts *cts) 5846 { 5847 const struct ieee80211_hdr *hdr = frame; 5848 5849 cts->frame_control = 5850 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5851 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5852 frame_len, frame_txctl); 5853 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5854 } 5855 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5856 5857 struct sk_buff * 5858 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5859 struct ieee80211_vif *vif) 5860 { 5861 struct ieee80211_local *local = hw_to_local(hw); 5862 struct sk_buff *skb = NULL; 5863 struct ieee80211_tx_data tx; 5864 struct ieee80211_sub_if_data *sdata; 5865 struct ps_data *ps; 5866 struct ieee80211_tx_info *info; 5867 struct ieee80211_chanctx_conf *chanctx_conf; 5868 5869 sdata = vif_to_sdata(vif); 5870 5871 rcu_read_lock(); 5872 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5873 5874 if (!chanctx_conf) 5875 goto out; 5876 5877 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5878 struct beacon_data *beacon = 5879 rcu_dereference(sdata->deflink.u.ap.beacon); 5880 5881 if (!beacon || !beacon->head) 5882 goto out; 5883 5884 ps = &sdata->u.ap.ps; 5885 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5886 ps = &sdata->u.mesh.ps; 5887 } else { 5888 goto out; 5889 } 5890 5891 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5892 goto out; /* send buffered bc/mc only after DTIM beacon */ 5893 5894 while (1) { 5895 skb = skb_dequeue(&ps->bc_buf); 5896 if (!skb) 5897 goto out; 5898 local->total_ps_buffered--; 5899 5900 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5901 struct ieee80211_hdr *hdr = 5902 (struct ieee80211_hdr *) skb->data; 5903 /* more buffered multicast/broadcast frames ==> set 5904 * MoreData flag in IEEE 802.11 header to inform PS 5905 * STAs */ 5906 hdr->frame_control |= 5907 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5908 } 5909 5910 if (sdata->vif.type == NL80211_IFTYPE_AP) 5911 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5912 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5913 break; 5914 ieee80211_free_txskb(hw, skb); 5915 } 5916 5917 info = IEEE80211_SKB_CB(skb); 5918 5919 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5920 info->band = chanctx_conf->def.chan->band; 5921 5922 if (invoke_tx_handlers(&tx)) 5923 skb = NULL; 5924 out: 5925 rcu_read_unlock(); 5926 5927 return skb; 5928 } 5929 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5930 5931 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5932 { 5933 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5934 struct ieee80211_sub_if_data *sdata = sta->sdata; 5935 struct ieee80211_local *local = sdata->local; 5936 int ret; 5937 u32 queues; 5938 5939 lockdep_assert_wiphy(local->hw.wiphy); 5940 5941 /* only some cases are supported right now */ 5942 switch (sdata->vif.type) { 5943 case NL80211_IFTYPE_STATION: 5944 case NL80211_IFTYPE_AP: 5945 case NL80211_IFTYPE_AP_VLAN: 5946 break; 5947 default: 5948 WARN_ON(1); 5949 return -EINVAL; 5950 } 5951 5952 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5953 return -EINVAL; 5954 5955 if (sta->reserved_tid == tid) { 5956 ret = 0; 5957 goto out; 5958 } 5959 5960 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5961 sdata_err(sdata, "TID reservation already active\n"); 5962 ret = -EALREADY; 5963 goto out; 5964 } 5965 5966 ieee80211_stop_vif_queues(sdata->local, sdata, 5967 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5968 5969 synchronize_net(); 5970 5971 /* Tear down BA sessions so we stop aggregating on this TID */ 5972 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5973 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5974 __ieee80211_stop_tx_ba_session(sta, tid, 5975 AGG_STOP_LOCAL_REQUEST); 5976 } 5977 5978 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5979 __ieee80211_flush_queues(local, sdata, queues, false); 5980 5981 sta->reserved_tid = tid; 5982 5983 ieee80211_wake_vif_queues(local, sdata, 5984 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5985 5986 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5987 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5988 5989 ret = 0; 5990 out: 5991 return ret; 5992 } 5993 EXPORT_SYMBOL(ieee80211_reserve_tid); 5994 5995 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5996 { 5997 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5998 struct ieee80211_sub_if_data *sdata = sta->sdata; 5999 6000 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6001 6002 /* only some cases are supported right now */ 6003 switch (sdata->vif.type) { 6004 case NL80211_IFTYPE_STATION: 6005 case NL80211_IFTYPE_AP: 6006 case NL80211_IFTYPE_AP_VLAN: 6007 break; 6008 default: 6009 WARN_ON(1); 6010 return; 6011 } 6012 6013 if (tid != sta->reserved_tid) { 6014 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6015 return; 6016 } 6017 6018 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6019 } 6020 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6021 6022 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6023 struct sk_buff *skb, int tid, int link_id, 6024 enum nl80211_band band) 6025 { 6026 const struct ieee80211_hdr *hdr = (void *)skb->data; 6027 int ac = ieee80211_ac_from_tid(tid); 6028 unsigned int link; 6029 6030 skb_reset_mac_header(skb); 6031 skb_set_queue_mapping(skb, ac); 6032 skb->priority = tid; 6033 6034 skb->dev = sdata->dev; 6035 6036 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6037 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6038 IEEE80211_LINK_UNSPECIFIED)); 6039 6040 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6041 link = 0; 6042 } else if (link_id >= 0) { 6043 link = link_id; 6044 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6045 /* address from the MLD */ 6046 link = IEEE80211_LINK_UNSPECIFIED; 6047 } else { 6048 /* otherwise must be addressed from a link */ 6049 rcu_read_lock(); 6050 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6051 struct ieee80211_bss_conf *link_conf; 6052 6053 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6054 if (!link_conf) 6055 continue; 6056 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6057 break; 6058 } 6059 rcu_read_unlock(); 6060 6061 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6062 link = ffs(sdata->vif.active_links) - 1; 6063 } 6064 6065 IEEE80211_SKB_CB(skb)->control.flags |= 6066 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6067 6068 /* 6069 * The other path calling ieee80211_xmit is from the tasklet, 6070 * and while we can handle concurrent transmissions locking 6071 * requirements are that we do not come into tx with bhs on. 6072 */ 6073 local_bh_disable(); 6074 IEEE80211_SKB_CB(skb)->band = band; 6075 ieee80211_xmit(sdata, NULL, skb); 6076 local_bh_enable(); 6077 } 6078 6079 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6080 struct sk_buff *skb, int tid, int link_id) 6081 { 6082 struct ieee80211_chanctx_conf *chanctx_conf; 6083 enum nl80211_band band; 6084 6085 rcu_read_lock(); 6086 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6087 WARN_ON(link_id >= 0); 6088 chanctx_conf = 6089 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6090 if (WARN_ON(!chanctx_conf)) { 6091 rcu_read_unlock(); 6092 kfree_skb(skb); 6093 return; 6094 } 6095 band = chanctx_conf->def.chan->band; 6096 } else { 6097 WARN_ON(link_id >= 0 && 6098 !(sdata->vif.active_links & BIT(link_id))); 6099 /* MLD transmissions must not rely on the band */ 6100 band = 0; 6101 } 6102 6103 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6104 rcu_read_unlock(); 6105 } 6106 6107 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6108 const u8 *buf, size_t len, 6109 const u8 *dest, __be16 proto, bool unencrypted, 6110 int link_id, u64 *cookie) 6111 { 6112 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6113 struct ieee80211_local *local = sdata->local; 6114 struct sta_info *sta; 6115 struct sk_buff *skb; 6116 struct ethhdr *ehdr; 6117 u32 ctrl_flags = 0; 6118 u32 flags = 0; 6119 int err; 6120 6121 /* mutex lock is only needed for incrementing the cookie counter */ 6122 lockdep_assert_wiphy(local->hw.wiphy); 6123 6124 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6125 * or Pre-Authentication 6126 */ 6127 if (proto != sdata->control_port_protocol && 6128 proto != cpu_to_be16(ETH_P_PREAUTH)) 6129 return -EINVAL; 6130 6131 if (proto == sdata->control_port_protocol) 6132 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6133 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6134 6135 if (unencrypted) 6136 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6137 6138 if (cookie) 6139 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6140 6141 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6142 6143 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6144 sizeof(struct ethhdr) + len); 6145 if (!skb) 6146 return -ENOMEM; 6147 6148 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6149 6150 skb_put_data(skb, buf, len); 6151 6152 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6153 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6154 6155 /* we may override the SA for MLO STA later */ 6156 if (link_id < 0) { 6157 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6158 IEEE80211_TX_CTRL_MLO_LINK); 6159 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6160 } else { 6161 struct ieee80211_bss_conf *link_conf; 6162 6163 ctrl_flags |= u32_encode_bits(link_id, 6164 IEEE80211_TX_CTRL_MLO_LINK); 6165 6166 rcu_read_lock(); 6167 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6168 if (!link_conf) { 6169 dev_kfree_skb(skb); 6170 rcu_read_unlock(); 6171 return -ENOLINK; 6172 } 6173 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6174 rcu_read_unlock(); 6175 } 6176 6177 ehdr->h_proto = proto; 6178 6179 skb->dev = dev; 6180 skb->protocol = proto; 6181 skb_reset_network_header(skb); 6182 skb_reset_mac_header(skb); 6183 6184 if (local->hw.queues < IEEE80211_NUM_ACS) 6185 goto start_xmit; 6186 6187 /* update QoS header to prioritize control port frames if possible, 6188 * priorization also happens for control port frames send over 6189 * AF_PACKET 6190 */ 6191 rcu_read_lock(); 6192 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6193 if (err) { 6194 dev_kfree_skb(skb); 6195 rcu_read_unlock(); 6196 return err; 6197 } 6198 6199 if (!IS_ERR(sta)) { 6200 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6201 6202 skb_set_queue_mapping(skb, queue); 6203 6204 /* 6205 * for MLO STA, the SA should be the AP MLD address, but 6206 * the link ID has been selected already 6207 */ 6208 if (sta && sta->sta.mlo) 6209 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6210 } 6211 rcu_read_unlock(); 6212 6213 start_xmit: 6214 local_bh_disable(); 6215 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6216 local_bh_enable(); 6217 6218 return 0; 6219 } 6220 6221 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6222 const u8 *buf, size_t len) 6223 { 6224 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6225 struct ieee80211_local *local = sdata->local; 6226 struct sk_buff *skb; 6227 6228 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6229 30 + /* header size */ 6230 18); /* 11s header size */ 6231 if (!skb) 6232 return -ENOMEM; 6233 6234 skb_reserve(skb, local->hw.extra_tx_headroom); 6235 skb_put_data(skb, buf, len); 6236 6237 skb->dev = dev; 6238 skb->protocol = htons(ETH_P_802_3); 6239 skb_reset_network_header(skb); 6240 skb_reset_mac_header(skb); 6241 6242 local_bh_disable(); 6243 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6244 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6245 NULL); 6246 local_bh_enable(); 6247 6248 return 0; 6249 } 6250