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) 2018-2026 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <linux/unaligned.h> 28 #include <net/fq_impl.h> 29 #include <net/sock.h> 30 #include <net/gso.h> 31 32 #include "ieee80211_i.h" 33 #include "driver-ops.h" 34 #include "led.h" 35 #include "mesh.h" 36 #include "wep.h" 37 #include "wpa.h" 38 #include "wme.h" 39 #include "rate.h" 40 41 /* misc utils */ 42 43 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 44 struct sk_buff *skb, int group_addr, 45 int next_frag_len) 46 { 47 int rate, mrate, erp, dur, i; 48 struct ieee80211_rate *txrate; 49 struct ieee80211_local *local = tx->local; 50 struct ieee80211_supported_band *sband; 51 struct ieee80211_hdr *hdr; 52 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 /* uh huh? */ 59 if (WARN_ON_ONCE(tx->rate.idx < 0)) 60 return 0; 61 62 if (info->band >= NUM_NL80211_BANDS) 63 return 0; 64 65 sband = local->hw.wiphy->bands[info->band]; 66 txrate = &sband->bitrates[tx->rate.idx]; 67 68 erp = txrate->flags & IEEE80211_RATE_ERP_G; 69 70 /* device is expected to do this */ 71 if (sband->band == NL80211_BAND_S1GHZ) 72 return 0; 73 74 /* 75 * data and mgmt (except PS Poll): 76 * - during CFP: 32768 77 * - during contention period: 78 * if addr1 is group address: 0 79 * if more fragments = 0 and addr1 is individual address: time to 80 * transmit one ACK plus SIFS 81 * if more fragments = 1 and addr1 is individual address: time to 82 * transmit next fragment plus 2 x ACK plus 3 x SIFS 83 * 84 * IEEE 802.11, 9.6: 85 * - control response frame (CTS or ACK) shall be transmitted using the 86 * same rate as the immediately previous frame in the frame exchange 87 * sequence, if this rate belongs to the PHY mandatory rates, or else 88 * at the highest possible rate belonging to the PHY rates in the 89 * BSSBasicRateSet 90 */ 91 hdr = (struct ieee80211_hdr *)skb->data; 92 if (ieee80211_is_ctl(hdr->frame_control)) { 93 /* TODO: These control frames are not currently sent by 94 * mac80211, but should they be implemented, this function 95 * needs to be updated to support duration field calculation. 96 * 97 * RTS: time needed to transmit pending data/mgmt frame plus 98 * one CTS frame plus one ACK frame plus 3 x SIFS 99 * CTS: duration of immediately previous RTS minus time 100 * required to transmit CTS and its SIFS 101 * ACK: 0 if immediately previous directed data/mgmt had 102 * more=0, with more=1 duration in ACK frame is duration 103 * from previous frame minus time needed to transmit ACK 104 * and its SIFS 105 * PS Poll: BIT(15) | BIT(14) | aid 106 */ 107 return 0; 108 } 109 110 /* data/mgmt */ 111 if (0 /* FIX: data/mgmt during CFP */) 112 return cpu_to_le16(32768); 113 114 if (group_addr) /* Group address as the destination - no ACK */ 115 return 0; 116 117 /* Individual destination address: 118 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 119 * CTS and ACK frames shall be transmitted using the highest rate in 120 * basic rate set that is less than or equal to the rate of the 121 * immediately previous frame and that is using the same modulation 122 * (CCK or OFDM). If no basic rate set matches with these requirements, 123 * the highest mandatory rate of the PHY that is less than or equal to 124 * the rate of the previous frame is used. 125 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 126 */ 127 rate = -1; 128 /* use lowest available if everything fails */ 129 mrate = sband->bitrates[0].bitrate; 130 for (i = 0; i < sband->n_bitrates; i++) { 131 struct ieee80211_rate *r = &sband->bitrates[i]; 132 u32 flag; 133 134 if (r->bitrate > txrate->bitrate) 135 break; 136 137 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 138 rate = r->bitrate; 139 140 switch (sband->band) { 141 case NL80211_BAND_2GHZ: 142 case NL80211_BAND_LC: 143 if (tx->sdata->deflink.operating_11g_mode) 144 flag = IEEE80211_RATE_MANDATORY_G; 145 else 146 flag = IEEE80211_RATE_MANDATORY_B; 147 break; 148 case NL80211_BAND_5GHZ: 149 case NL80211_BAND_6GHZ: 150 flag = IEEE80211_RATE_MANDATORY_A; 151 break; 152 default: 153 flag = 0; 154 WARN_ON(1); 155 break; 156 } 157 158 if (r->flags & flag) 159 mrate = r->bitrate; 160 } 161 if (rate == -1) { 162 /* No matching basic rate found; use highest suitable mandatory 163 * PHY rate */ 164 rate = mrate; 165 } 166 167 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 168 if (ieee80211_is_data_qos(hdr->frame_control) && 169 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 170 dur = 0; 171 else 172 /* Time needed to transmit ACK 173 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 174 * to closest integer */ 175 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 176 tx->sdata->vif.bss_conf.use_short_preamble); 177 178 if (next_frag_len) { 179 /* Frame is fragmented: duration increases with time needed to 180 * transmit next fragment plus ACK and 2 x SIFS. */ 181 dur *= 2; /* ACK + SIFS */ 182 /* next fragment */ 183 dur += ieee80211_frame_duration(sband->band, next_frag_len, 184 txrate->bitrate, erp, 185 tx->sdata->vif.bss_conf.use_short_preamble); 186 } 187 188 return cpu_to_le16(dur); 189 } 190 191 /* tx handlers */ 192 static ieee80211_tx_result debug_noinline 193 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 194 { 195 struct ieee80211_local *local = tx->local; 196 struct ieee80211_if_managed *ifmgd; 197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 198 199 /* driver doesn't support power save */ 200 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 201 return TX_CONTINUE; 202 203 /* hardware does dynamic power save */ 204 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 205 return TX_CONTINUE; 206 207 /* dynamic power save disabled */ 208 if (local->hw.conf.dynamic_ps_timeout <= 0) 209 return TX_CONTINUE; 210 211 /* we are scanning, don't enable power save */ 212 if (local->scanning) 213 return TX_CONTINUE; 214 215 if (!local->ps_sdata) 216 return TX_CONTINUE; 217 218 /* No point if we're going to suspend */ 219 if (local->quiescing) 220 return TX_CONTINUE; 221 222 /* dynamic ps is supported only in managed mode */ 223 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 224 return TX_CONTINUE; 225 226 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 227 return TX_CONTINUE; 228 229 ifmgd = &tx->sdata->u.mgd; 230 231 /* 232 * Don't wakeup from power save if u-apsd is enabled, voip ac has 233 * u-apsd enabled and the frame is in voip class. This effectively 234 * means that even if all access categories have u-apsd enabled, in 235 * practise u-apsd is only used with the voip ac. This is a 236 * workaround for the case when received voip class packets do not 237 * have correct qos tag for some reason, due the network or the 238 * peer application. 239 * 240 * Note: ifmgd->uapsd_queues access is racy here. If the value is 241 * changed via debugfs, user needs to reassociate manually to have 242 * everything in sync. 243 */ 244 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 245 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 246 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 247 return TX_CONTINUE; 248 249 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 250 ieee80211_stop_queues_by_reason(&local->hw, 251 IEEE80211_MAX_QUEUE_MAP, 252 IEEE80211_QUEUE_STOP_REASON_PS, 253 false); 254 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 255 wiphy_work_queue(local->hw.wiphy, 256 &local->dynamic_ps_disable_work); 257 } 258 259 /* Don't restart the timer if we're not disassociated */ 260 if (!ifmgd->associated) 261 return TX_CONTINUE; 262 263 mod_timer(&local->dynamic_ps_timer, jiffies + 264 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 265 266 return TX_CONTINUE; 267 } 268 269 static ieee80211_tx_result debug_noinline 270 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 271 { 272 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 273 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 274 bool assoc = false; 275 276 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 277 return TX_CONTINUE; 278 279 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 280 return TX_CONTINUE; 281 282 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 283 return TX_CONTINUE; 284 285 if (tx->sta) 286 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 287 288 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 289 if (unlikely(!assoc && 290 ieee80211_is_data(hdr->frame_control))) { 291 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 292 sdata_info(tx->sdata, 293 "dropped data frame to not associated station %pM\n", 294 hdr->addr1); 295 #endif 296 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 297 return TX_DROP; 298 } 299 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 300 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 301 /* 302 * No associated STAs - no need to send multicast 303 * frames. 304 */ 305 return TX_DROP; 306 } 307 308 return TX_CONTINUE; 309 } 310 311 /* This function is called whenever the AP is about to exceed the maximum limit 312 * of buffered frames for power saving STAs. This situation should not really 313 * happen often during normal operation, so dropping the oldest buffered packet 314 * from each queue should be OK to make some room for new frames. */ 315 static void purge_old_ps_buffers(struct ieee80211_local *local) 316 { 317 int total = 0, purged = 0; 318 struct sk_buff *skb; 319 struct ieee80211_sub_if_data *sdata; 320 struct sta_info *sta; 321 322 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 323 struct ps_data *ps; 324 325 if (sdata->vif.type == NL80211_IFTYPE_AP) 326 ps = &sdata->u.ap.ps; 327 else if (ieee80211_vif_is_mesh(&sdata->vif)) 328 ps = &sdata->u.mesh.ps; 329 else 330 continue; 331 332 skb = skb_dequeue(&ps->bc_buf); 333 if (skb) { 334 purged++; 335 ieee80211_free_txskb(&local->hw, skb); 336 } 337 total += skb_queue_len(&ps->bc_buf); 338 } 339 340 /* 341 * Drop one frame from each station from the lowest-priority 342 * AC that has frames at all. 343 */ 344 list_for_each_entry_rcu(sta, &local->sta_list, list) { 345 int ac; 346 347 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 348 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 349 total += skb_queue_len(&sta->ps_tx_buf[ac]); 350 if (skb) { 351 purged++; 352 ieee80211_free_txskb(&local->hw, skb); 353 break; 354 } 355 } 356 } 357 358 local->total_ps_buffered = total; 359 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 360 } 361 362 static ieee80211_tx_result 363 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 364 { 365 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 366 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 367 struct ps_data *ps; 368 369 /* 370 * broadcast/multicast frame 371 * 372 * If any of the associated/peer stations is in power save mode, 373 * the frame is buffered to be sent after DTIM beacon frame. 374 * This is done either by the hardware or us. 375 */ 376 377 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 378 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 379 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 380 if (!tx->sdata->bss) 381 return TX_CONTINUE; 382 383 ps = &tx->sdata->bss->ps; 384 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 385 ps = &tx->sdata->u.mesh.ps; 386 } else { 387 return TX_CONTINUE; 388 } 389 390 391 /* no buffering for ordered frames */ 392 if (ieee80211_has_order(hdr->frame_control)) 393 return TX_CONTINUE; 394 395 if (ieee80211_is_probe_req(hdr->frame_control)) 396 return TX_CONTINUE; 397 398 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 399 info->hw_queue = tx->sdata->vif.cab_queue; 400 401 /* no stations in PS mode and no buffered packets */ 402 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 403 return TX_CONTINUE; 404 405 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 406 407 /* device releases frame after DTIM beacon */ 408 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 409 return TX_CONTINUE; 410 411 /* buffered in mac80211 */ 412 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 413 purge_old_ps_buffers(tx->local); 414 415 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 416 ps_dbg(tx->sdata, 417 "BC TX buffer full - dropping the oldest frame\n"); 418 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 419 } else 420 tx->local->total_ps_buffered++; 421 422 skb_queue_tail(&ps->bc_buf, tx->skb); 423 424 return TX_QUEUED; 425 } 426 427 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 428 struct sk_buff *skb) 429 { 430 if (!ieee80211_is_mgmt(fc)) 431 return 0; 432 433 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 434 return 0; 435 436 if (!ieee80211_is_robust_mgmt_frame(skb)) 437 return 0; 438 439 return 1; 440 } 441 442 static ieee80211_tx_result 443 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 444 { 445 struct sta_info *sta = tx->sta; 446 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 447 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 448 struct ieee80211_local *local = tx->local; 449 450 if (unlikely(!sta)) 451 return TX_CONTINUE; 452 453 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 454 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 455 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 456 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 457 int ac = skb_get_queue_mapping(tx->skb); 458 459 if (ieee80211_is_mgmt(hdr->frame_control) && 460 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 461 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 462 return TX_CONTINUE; 463 } 464 465 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 466 sta->sta.addr, sta->sta.aid, ac); 467 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 468 purge_old_ps_buffers(tx->local); 469 470 /* sync with ieee80211_sta_ps_deliver_wakeup */ 471 spin_lock(&sta->ps_lock); 472 /* 473 * STA woke up the meantime and all the frames on ps_tx_buf have 474 * been queued to pending queue. No reordering can happen, go 475 * ahead and Tx the packet. 476 */ 477 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 478 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 479 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 480 spin_unlock(&sta->ps_lock); 481 return TX_CONTINUE; 482 } 483 484 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 485 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 486 ps_dbg(tx->sdata, 487 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 488 sta->sta.addr, ac); 489 ieee80211_free_txskb(&local->hw, old); 490 } else 491 tx->local->total_ps_buffered++; 492 493 info->control.jiffies = jiffies; 494 info->control.vif = &tx->sdata->vif; 495 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 496 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 497 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 498 spin_unlock(&sta->ps_lock); 499 500 if (!timer_pending(&local->sta_cleanup)) 501 mod_timer(&local->sta_cleanup, 502 round_jiffies(jiffies + 503 STA_INFO_CLEANUP_INTERVAL)); 504 505 /* 506 * We queued up some frames, so the TIM bit might 507 * need to be set, recalculate it. 508 */ 509 sta_info_recalc_tim(sta); 510 511 return TX_QUEUED; 512 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 513 ps_dbg(tx->sdata, 514 "STA %pM in PS mode, but polling/in SP -> send frame\n", 515 sta->sta.addr); 516 } 517 518 return TX_CONTINUE; 519 } 520 521 static ieee80211_tx_result debug_noinline 522 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 523 { 524 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 525 return TX_CONTINUE; 526 527 if (tx->flags & IEEE80211_TX_UNICAST) 528 return ieee80211_tx_h_unicast_ps_buf(tx); 529 else 530 return ieee80211_tx_h_multicast_ps_buf(tx); 531 } 532 533 static ieee80211_tx_result debug_noinline 534 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 535 { 536 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 537 538 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 539 if (tx->sdata->control_port_no_encrypt) 540 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 541 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 542 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 543 } 544 545 return TX_CONTINUE; 546 } 547 548 static struct ieee80211_key * 549 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 550 { 551 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 552 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 553 struct ieee80211_link_data *link; 554 unsigned int link_id; 555 556 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 557 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 558 link = &tx->sdata->deflink; 559 } else { 560 link = rcu_dereference(tx->sdata->link[link_id]); 561 if (!link) 562 return NULL; 563 } 564 565 if (ieee80211_is_group_privacy_action(tx->skb)) 566 return rcu_dereference(link->default_multicast_key); 567 else if (ieee80211_is_mgmt(hdr->frame_control) && 568 is_multicast_ether_addr(hdr->addr1) && 569 ieee80211_is_robust_mgmt_frame(tx->skb)) 570 return rcu_dereference(link->default_mgmt_key); 571 else if (is_multicast_ether_addr(hdr->addr1)) 572 return rcu_dereference(link->default_multicast_key); 573 574 return NULL; 575 } 576 577 /* 578 * An 802.3 frame is always a data frame, so there are no 802.11 addresses to 579 * look at: with a station the pairwise key is all that can apply, without one 580 * the frame is group addressed. On an MLD the driver has to pick the group key 581 * itself, as the same frame goes out on several links that each have their own. 582 */ 583 static ieee80211_tx_result 584 ieee80211_select_key_8023(struct ieee80211_tx_data *tx) 585 { 586 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 587 588 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 589 return TX_CONTINUE; 590 591 if (tx->sta) { 592 tx->key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]); 593 if (!tx->key) 594 tx->key = rcu_dereference(tx->sdata->default_unicast_key); 595 596 if (!tx->key && test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) 597 return TX_DROP; 598 } else if (!ieee80211_vif_is_mld(&tx->sdata->vif)) { 599 tx->key = rcu_dereference(tx->sdata->deflink.default_multicast_key); 600 } 601 602 if (!tx->key) 603 return TX_CONTINUE; 604 605 if (unlikely(tx->key->flags & KEY_FLAG_TAINTED)) 606 return TX_DROP; 607 608 if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 609 info->control.hw_key = &tx->key->conf; 610 611 return TX_CONTINUE; 612 } 613 614 static ieee80211_tx_result debug_noinline 615 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 616 { 617 struct ieee80211_key *key; 618 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 619 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 620 621 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 622 return ieee80211_select_key_8023(tx); 623 624 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 625 tx->key = NULL; 626 return TX_CONTINUE; 627 } 628 629 if (tx->sta && 630 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 631 tx->key = key; 632 else if ((key = ieee80211_select_link_key(tx))) 633 tx->key = key; 634 else if (!is_multicast_ether_addr(hdr->addr1) && 635 (key = rcu_dereference(tx->sdata->default_unicast_key))) 636 tx->key = key; 637 else 638 tx->key = NULL; 639 640 if (tx->key) { 641 bool skip_hw = false; 642 643 /* TODO: add threshold stuff again */ 644 645 switch (tx->key->conf.cipher) { 646 case WLAN_CIPHER_SUITE_WEP40: 647 case WLAN_CIPHER_SUITE_WEP104: 648 case WLAN_CIPHER_SUITE_TKIP: 649 if (!ieee80211_is_data_present(hdr->frame_control)) 650 tx->key = NULL; 651 break; 652 case WLAN_CIPHER_SUITE_CCMP: 653 case WLAN_CIPHER_SUITE_CCMP_256: 654 case WLAN_CIPHER_SUITE_GCMP: 655 case WLAN_CIPHER_SUITE_GCMP_256: 656 if (!ieee80211_is_data_present(hdr->frame_control) && 657 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 658 tx->skb) && 659 !ieee80211_is_group_privacy_action(tx->skb) && 660 !ieee80211_require_encrypted_assoc(hdr->frame_control, 661 tx->sta)) 662 tx->key = NULL; 663 else 664 skip_hw = (tx->key->conf.flags & 665 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 666 ieee80211_is_mgmt(hdr->frame_control); 667 break; 668 case WLAN_CIPHER_SUITE_AES_CMAC: 669 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 670 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 671 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 672 if (!ieee80211_is_mgmt(hdr->frame_control)) 673 tx->key = NULL; 674 break; 675 } 676 677 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 678 !ieee80211_is_deauth(hdr->frame_control)) && 679 tx->skb->protocol != tx->sdata->control_port_protocol) 680 return TX_DROP; 681 682 if (!skip_hw && tx->key && 683 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 684 info->control.hw_key = &tx->key->conf; 685 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 686 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 687 return TX_DROP; 688 } 689 690 return TX_CONTINUE; 691 } 692 693 static ieee80211_tx_result debug_noinline 694 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 695 { 696 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 697 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 698 struct ieee80211_supported_band *sband; 699 u32 len; 700 struct ieee80211_tx_rate_control txrc; 701 struct ieee80211_sta_rates *ratetbl = NULL; 702 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 703 bool assoc = false; 704 705 memset(&txrc, 0, sizeof(txrc)); 706 707 if (info->band < NUM_NL80211_BANDS) 708 sband = tx->local->hw.wiphy->bands[info->band]; 709 else 710 return TX_CONTINUE; 711 712 len = min_t(u32, tx->skb->len + FCS_LEN, 713 tx->local->hw.wiphy->frag_threshold); 714 715 /* set up the tx rate control struct we give the RC algo */ 716 txrc.hw = &tx->local->hw; 717 txrc.sband = sband; 718 txrc.bss_conf = &tx->sdata->vif.bss_conf; 719 txrc.skb = tx->skb; 720 txrc.reported_rate.idx = -1; 721 722 if (unlikely(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK)) { 723 txrc.rate_idx_mask = ~0; 724 } else { 725 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 726 727 if (tx->sdata->rc_has_mcs_mask[info->band]) 728 txrc.rate_idx_mcs_mask = 729 tx->sdata->rc_rateidx_mcs_mask[info->band]; 730 } 731 732 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 733 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 734 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 735 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 736 737 /* set up RTS protection if desired */ 738 if (len > tx->local->hw.wiphy->rts_threshold) { 739 txrc.rts = true; 740 } 741 742 info->control.use_rts = txrc.rts; 743 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 744 745 /* 746 * Use short preamble if the BSS can handle it, but not for 747 * management frames unless we know the receiver can handle 748 * that -- the management frame might be to a station that 749 * just wants a probe response. 750 */ 751 if (tx->sdata->vif.bss_conf.use_short_preamble && 752 (ieee80211_is_tx_data(tx->skb) || 753 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 754 txrc.short_preamble = true; 755 756 info->control.short_preamble = txrc.short_preamble; 757 758 /* don't ask rate control when rate already injected via radiotap */ 759 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 760 return TX_CONTINUE; 761 762 if (tx->sta) 763 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 764 765 /* 766 * Lets not bother rate control if we're associated and cannot talk to 767 * the sta. This should not happen - except for frames that aren't 768 * really for the peer to start with and already ignore rates. 769 */ 770 if (!(info->control.flags & IEEE80211_TX_CTRL_DONT_USE_RATE_MASK) && 771 WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 772 !rate_usable_index_exists(sband, &tx->sta->sta), 773 "%s: Dropped data frame as no usable bitrate found while " 774 "scanning and associated. Target station: " 775 "%pM on %d GHz band\n", 776 tx->sdata->name, 777 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 778 info->band ? 5 : 2)) 779 return TX_DROP; 780 781 /* 782 * If we're associated with the sta at this point we know we can at 783 * least send the frame at the lowest bit rate. 784 */ 785 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 786 787 if (tx->sta && !info->control.skip_table) 788 ratetbl = rcu_dereference(tx->sta->sta.rates); 789 790 if (unlikely(info->control.rates[0].idx < 0)) { 791 if (ratetbl) { 792 struct ieee80211_tx_rate rate = { 793 .idx = ratetbl->rate[0].idx, 794 .flags = ratetbl->rate[0].flags, 795 .count = ratetbl->rate[0].count 796 }; 797 798 if (ratetbl->rate[0].idx < 0) 799 return TX_DROP; 800 801 tx->rate = rate; 802 } else { 803 return TX_DROP; 804 } 805 } else { 806 tx->rate = info->control.rates[0]; 807 } 808 809 if (txrc.reported_rate.idx < 0) { 810 txrc.reported_rate = tx->rate; 811 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 812 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 813 } else if (tx->sta) 814 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 815 816 if (ratetbl) 817 return TX_CONTINUE; 818 819 if (unlikely(!info->control.rates[0].count)) 820 info->control.rates[0].count = 1; 821 822 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 823 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 824 info->control.rates[0].count = 1; 825 826 return TX_CONTINUE; 827 } 828 829 static ieee80211_tx_result debug_noinline 830 ieee80211_tx_h_check_offchannel(struct ieee80211_tx_data *tx) 831 { 832 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 833 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 834 835 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 836 return TX_CONTINUE; 837 838 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 839 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 840 !ieee80211_is_probe_req(hdr->frame_control) && 841 !ieee80211_is_any_nullfunc(hdr->frame_control)) { 842 /* 843 * When software scanning only nullfunc frames (to notify 844 * the sleep state to the AP) and probe requests (for the 845 * active scan) are allowed, all other frames should not be 846 * sent and we should not get here, but if we do 847 * nonetheless, drop them to avoid sending them 848 * off-channel. See __ieee80211_start_scan() for more. 849 */ 850 return TX_DROP; 851 } 852 853 return TX_CONTINUE; 854 } 855 856 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 857 { 858 u16 *seq = &sta->tid_seq[tid]; 859 __le16 ret = cpu_to_le16(*seq); 860 861 /* Increase the sequence number. */ 862 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 863 864 return ret; 865 } 866 867 static ieee80211_tx_result debug_noinline 868 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 869 { 870 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 871 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 872 int tid; 873 874 /* 875 * Packet injection may want to control the sequence 876 * number, if we have no matching interface then we 877 * neither assign one ourselves nor ask the driver to. 878 */ 879 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 880 return TX_CONTINUE; 881 882 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 883 return TX_CONTINUE; 884 885 if (ieee80211_hdrlen(hdr->frame_control) < 24) 886 return TX_CONTINUE; 887 888 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 889 return TX_CONTINUE; 890 891 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 892 return TX_CONTINUE; 893 894 /* SNS11 from 802.11be 10.3.2.14 */ 895 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 896 ieee80211_vif_is_mld(info->control.vif) && 897 info->control.vif->type == NL80211_IFTYPE_AP)) { 898 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 899 tx->sdata->mld_mcast_seq += 0x10; 900 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 901 return TX_CONTINUE; 902 } 903 904 /* 905 * Anything but QoS data that has a sequence number field 906 * (is long enough) gets a sequence number from the global 907 * counter. QoS data frames with a multicast destination 908 * also use the global counter (802.11-2012 9.3.2.10). 909 */ 910 if (!ieee80211_is_data_qos(hdr->frame_control) || 911 is_multicast_ether_addr(hdr->addr1)) { 912 /* driver should assign sequence number */ 913 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 914 /* for pure STA mode without beacons, we can do it */ 915 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 916 tx->sdata->sequence_number += 0x10; 917 if (tx->sta) 918 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 919 return TX_CONTINUE; 920 } 921 922 /* 923 * This should be true for injected/management frames only, for 924 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 925 * above since they are not QoS-data frames. 926 */ 927 if (!tx->sta) 928 return TX_CONTINUE; 929 930 /* include per-STA, per-TID sequence counter */ 931 tid = ieee80211_get_tid(hdr); 932 tx->sta->deflink.tx_stats.msdu[tid]++; 933 934 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 935 936 return TX_CONTINUE; 937 } 938 939 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 940 struct sk_buff *skb, int hdrlen, 941 int frag_threshold) 942 { 943 struct ieee80211_local *local = tx->local; 944 struct ieee80211_tx_info *info; 945 struct sk_buff *tmp; 946 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 947 int pos = hdrlen + per_fragm; 948 int rem = skb->len - hdrlen - per_fragm; 949 950 if (WARN_ON(rem < 0)) 951 return -EINVAL; 952 953 /* first fragment was already added to queue by caller */ 954 955 while (rem) { 956 int fraglen = per_fragm; 957 958 if (fraglen > rem) 959 fraglen = rem; 960 rem -= fraglen; 961 tmp = dev_alloc_skb(local->tx_headroom + 962 frag_threshold + 963 IEEE80211_ENCRYPT_HEADROOM + 964 IEEE80211_ENCRYPT_TAILROOM); 965 if (!tmp) 966 return -ENOMEM; 967 968 __skb_queue_tail(&tx->skbs, tmp); 969 970 skb_reserve(tmp, 971 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 972 973 /* copy control information */ 974 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 975 976 info = IEEE80211_SKB_CB(tmp); 977 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 978 IEEE80211_TX_CTL_FIRST_FRAGMENT); 979 980 if (rem) 981 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 982 983 skb_copy_queue_mapping(tmp, skb); 984 tmp->priority = skb->priority; 985 tmp->dev = skb->dev; 986 987 /* copy header and data */ 988 skb_put_data(tmp, skb->data, hdrlen); 989 skb_put_data(tmp, skb->data + pos, fraglen); 990 991 pos += fraglen; 992 } 993 994 /* adjust first fragment's length */ 995 skb_trim(skb, hdrlen + per_fragm); 996 return 0; 997 } 998 999 static ieee80211_tx_result debug_noinline 1000 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 1001 { 1002 struct sk_buff *skb = tx->skb; 1003 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1004 struct ieee80211_hdr *hdr = (void *)skb->data; 1005 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 1006 int hdrlen; 1007 int fragnum; 1008 1009 /* no matter what happens, tx->skb moves to tx->skbs */ 1010 __skb_queue_tail(&tx->skbs, skb); 1011 tx->skb = NULL; 1012 1013 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 1014 return TX_CONTINUE; 1015 1016 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 1017 return TX_CONTINUE; 1018 1019 /* 1020 * Warn when submitting a fragmented A-MPDU frame and drop it. 1021 * This scenario is handled in ieee80211_tx_prepare but extra 1022 * caution taken here as fragmented ampdu may cause Tx stop. 1023 */ 1024 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 1025 return TX_DROP; 1026 1027 hdrlen = ieee80211_hdrlen(hdr->frame_control); 1028 1029 /* internal error, why isn't DONTFRAG set? */ 1030 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 1031 return TX_DROP; 1032 1033 /* 1034 * Now fragment the frame. This will allocate all the fragments and 1035 * chain them (using skb as the first fragment) to skb->next. 1036 * During transmission, we will remove the successfully transmitted 1037 * fragments from this list. When the low-level driver rejects one 1038 * of the fragments then we will simply pretend to accept the skb 1039 * but store it away as pending. 1040 */ 1041 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 1042 return TX_DROP; 1043 1044 /* update duration/seq/flags of fragments */ 1045 fragnum = 0; 1046 1047 skb_queue_walk(&tx->skbs, skb) { 1048 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1049 1050 hdr = (void *)skb->data; 1051 info = IEEE80211_SKB_CB(skb); 1052 1053 if (!skb_queue_is_last(&tx->skbs, skb)) { 1054 hdr->frame_control |= morefrags; 1055 /* 1056 * No multi-rate retries for fragmented frames, that 1057 * would completely throw off the NAV at other STAs. 1058 */ 1059 info->control.rates[1].idx = -1; 1060 info->control.rates[2].idx = -1; 1061 info->control.rates[3].idx = -1; 1062 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1063 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1064 } else { 1065 hdr->frame_control &= ~morefrags; 1066 } 1067 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1068 fragnum++; 1069 } 1070 1071 return TX_CONTINUE; 1072 } 1073 1074 static ieee80211_tx_result debug_noinline 1075 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1076 { 1077 struct sk_buff *skb; 1078 int ac = -1; 1079 1080 if (!tx->sta) 1081 return TX_CONTINUE; 1082 1083 skb_queue_walk(&tx->skbs, skb) { 1084 ac = skb_get_queue_mapping(skb); 1085 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1086 } 1087 if (ac >= 0) 1088 tx->sta->deflink.tx_stats.packets[ac]++; 1089 1090 return TX_CONTINUE; 1091 } 1092 1093 static ieee80211_tx_result debug_noinline 1094 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1095 { 1096 if (!tx->key) 1097 return TX_CONTINUE; 1098 1099 switch (tx->key->conf.cipher) { 1100 case WLAN_CIPHER_SUITE_WEP40: 1101 case WLAN_CIPHER_SUITE_WEP104: 1102 return ieee80211_crypto_wep_encrypt(tx); 1103 case WLAN_CIPHER_SUITE_TKIP: 1104 return ieee80211_crypto_tkip_encrypt(tx); 1105 case WLAN_CIPHER_SUITE_CCMP: 1106 return ieee80211_crypto_ccmp_encrypt( 1107 tx, IEEE80211_CCMP_MIC_LEN); 1108 case WLAN_CIPHER_SUITE_CCMP_256: 1109 return ieee80211_crypto_ccmp_encrypt( 1110 tx, IEEE80211_CCMP_256_MIC_LEN); 1111 case WLAN_CIPHER_SUITE_AES_CMAC: 1112 return ieee80211_crypto_aes_cmac_encrypt( 1113 tx, IEEE80211_CMAC_128_MIC_LEN); 1114 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1115 return ieee80211_crypto_aes_cmac_encrypt( 1116 tx, IEEE80211_CMAC_256_MIC_LEN); 1117 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1118 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1119 return ieee80211_crypto_aes_gmac_encrypt(tx); 1120 case WLAN_CIPHER_SUITE_GCMP: 1121 case WLAN_CIPHER_SUITE_GCMP_256: 1122 return ieee80211_crypto_gcmp_encrypt(tx); 1123 } 1124 1125 return TX_DROP; 1126 } 1127 1128 static ieee80211_tx_result debug_noinline 1129 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1130 { 1131 struct sk_buff *skb; 1132 struct ieee80211_hdr *hdr; 1133 int next_len; 1134 bool group_addr; 1135 1136 skb_queue_walk(&tx->skbs, skb) { 1137 hdr = (void *) skb->data; 1138 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1139 break; /* must not overwrite AID */ 1140 if (!skb_queue_is_last(&tx->skbs, skb)) { 1141 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1142 next_len = next->len; 1143 } else 1144 next_len = 0; 1145 group_addr = is_multicast_ether_addr(hdr->addr1); 1146 1147 hdr->duration_id = 1148 ieee80211_duration(tx, skb, group_addr, next_len); 1149 } 1150 1151 return TX_CONTINUE; 1152 } 1153 1154 /* actual transmit path */ 1155 1156 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1157 struct sk_buff *skb, 1158 struct ieee80211_tx_info *info, 1159 struct tid_ampdu_tx *tid_tx, 1160 int tid) 1161 { 1162 bool queued = false; 1163 bool reset_agg_timer = false; 1164 struct sk_buff *purge_skb = NULL; 1165 1166 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1167 reset_agg_timer = true; 1168 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1169 /* 1170 * nothing -- this aggregation session is being started 1171 * but that might still fail with the driver 1172 */ 1173 } else if (!tx->sta->sta.txq[tid]) { 1174 spin_lock(&tx->sta->lock); 1175 /* 1176 * Need to re-check now, because we may get here 1177 * 1178 * 1) in the window during which the setup is actually 1179 * already done, but not marked yet because not all 1180 * packets are spliced over to the driver pending 1181 * queue yet -- if this happened we acquire the lock 1182 * either before or after the splice happens, but 1183 * need to recheck which of these cases happened. 1184 * 1185 * 2) during session teardown, if the OPERATIONAL bit 1186 * was cleared due to the teardown but the pointer 1187 * hasn't been assigned NULL yet (or we loaded it 1188 * before it was assigned) -- in this case it may 1189 * now be NULL which means we should just let the 1190 * packet pass through because splicing the frames 1191 * back is already done. 1192 */ 1193 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1194 1195 if (!tid_tx) { 1196 /* do nothing, let packet pass through */ 1197 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1198 reset_agg_timer = true; 1199 } else { 1200 queued = true; 1201 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1202 clear_sta_flag(tx->sta, WLAN_STA_SP); 1203 ps_dbg(tx->sta->sdata, 1204 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1205 tx->sta->sta.addr, tx->sta->sta.aid); 1206 } 1207 info->control.vif = &tx->sdata->vif; 1208 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1209 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1210 __skb_queue_tail(&tid_tx->pending, skb); 1211 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1212 purge_skb = __skb_dequeue(&tid_tx->pending); 1213 } 1214 spin_unlock(&tx->sta->lock); 1215 1216 if (purge_skb) 1217 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1218 } 1219 1220 /* reset session timer */ 1221 if (reset_agg_timer) 1222 tid_tx->last_tx = jiffies; 1223 1224 return queued; 1225 } 1226 1227 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1228 struct sta_info *sta, struct sk_buff *skb) 1229 { 1230 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1231 u16 tid; 1232 1233 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1234 return; 1235 1236 if (!sta || 1237 (!sta->sta.valid_links && !sta->sta.deflink.ht_cap.ht_supported && 1238 !sta->sta.deflink.s1g_cap.s1g) || 1239 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1240 skb->protocol == sdata->control_port_protocol) 1241 return; 1242 1243 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1244 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1245 return; 1246 1247 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1248 } 1249 1250 /* 1251 * initialises @tx 1252 * pass %NULL for the station if unknown, a valid pointer if known 1253 * or an ERR_PTR() if the station is known not to exist 1254 */ 1255 static ieee80211_tx_result 1256 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1257 struct ieee80211_tx_data *tx, 1258 struct sta_info *sta, struct sk_buff *skb) 1259 { 1260 struct ieee80211_local *local = sdata->local; 1261 struct ieee80211_hdr *hdr; 1262 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1263 bool aggr_check = false; 1264 int tid; 1265 1266 memset(tx, 0, sizeof(*tx)); 1267 tx->skb = skb; 1268 tx->local = local; 1269 tx->sdata = sdata; 1270 __skb_queue_head_init(&tx->skbs); 1271 1272 /* 1273 * If this flag is set to true anywhere, and we get here, 1274 * we are doing the needed processing, so remove the flag 1275 * now. 1276 */ 1277 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1278 1279 hdr = (struct ieee80211_hdr *) skb->data; 1280 1281 if (likely(sta)) { 1282 if (!IS_ERR(sta)) 1283 tx->sta = sta; 1284 } else { 1285 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1286 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1287 if (!tx->sta && sdata->wdev.use_4addr) 1288 return TX_DROP; 1289 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1290 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1291 } 1292 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1293 tx->sta = sta_info_get(sdata, hdr->addr1); 1294 aggr_check = true; 1295 } 1296 } 1297 1298 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1299 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1300 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1301 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1302 struct tid_ampdu_tx *tid_tx; 1303 1304 tid = ieee80211_get_tid(hdr); 1305 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1306 if (!tid_tx && aggr_check) { 1307 ieee80211_aggr_check(sdata, tx->sta, skb); 1308 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1309 } 1310 1311 if (tid_tx) { 1312 bool queued; 1313 1314 queued = ieee80211_tx_prep_agg(tx, skb, info, 1315 tid_tx, tid); 1316 1317 if (unlikely(queued)) 1318 return TX_QUEUED; 1319 } 1320 } 1321 1322 if (is_multicast_ether_addr(hdr->addr1)) { 1323 tx->flags &= ~IEEE80211_TX_UNICAST; 1324 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1325 } else 1326 tx->flags |= IEEE80211_TX_UNICAST; 1327 1328 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1329 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1330 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1331 info->flags & IEEE80211_TX_CTL_AMPDU) 1332 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1333 } 1334 1335 if (!tx->sta) 1336 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1337 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1338 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1339 ieee80211_check_fast_xmit(tx->sta); 1340 } 1341 1342 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1343 1344 return TX_CONTINUE; 1345 } 1346 1347 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1348 struct ieee80211_vif *vif, 1349 struct sta_info *sta, 1350 struct sk_buff *skb) 1351 { 1352 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1353 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1354 struct ieee80211_txq *txq = NULL; 1355 1356 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1357 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1358 return NULL; 1359 1360 /* 1361 * While (re)association request/response frames are not considered 1362 * bufferable MMPDUs, use the TXQ abstraction for the transmission of 1363 * these frames. This is specifically useful for drivers that might 1364 * associate other resources with the TXQ, e.g., encryption keys etc. 1365 */ 1366 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1367 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1368 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1369 ieee80211_is_bufferable_mmpdu(skb) || 1370 ieee80211_is_assoc(hdr->frame_control) || 1371 vif->type == NL80211_IFTYPE_STATION || 1372 vif->type == NL80211_IFTYPE_NAN || 1373 vif->type == NL80211_IFTYPE_NAN_DATA) && 1374 sta && sta->uploaded) { 1375 /* 1376 * This will be NULL if the driver didn't set the 1377 * opt-in hardware flag. 1378 */ 1379 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1380 } else if ((!ieee80211_is_mgmt(hdr->frame_control) || 1381 ieee80211_is_bufferable_mmpdu(skb)) && 1382 !sta) { 1383 txq = vif->txq_mgmt; 1384 } 1385 } else if (sta) { 1386 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1387 1388 if (!sta->uploaded) 1389 return NULL; 1390 1391 txq = sta->sta.txq[tid]; 1392 } else { 1393 txq = vif->txq; 1394 } 1395 1396 if (!txq) 1397 return NULL; 1398 1399 return to_txq_info(txq); 1400 } 1401 1402 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1403 { 1404 struct sk_buff *next; 1405 codel_time_t now = codel_get_time(); 1406 1407 skb_list_walk_safe(skb, skb, next) 1408 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1409 } 1410 1411 static u32 codel_skb_len_func(const struct sk_buff *skb) 1412 { 1413 return skb->len; 1414 } 1415 1416 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1417 { 1418 const struct ieee80211_tx_info *info; 1419 1420 info = (const struct ieee80211_tx_info *)skb->cb; 1421 return info->control.enqueue_time; 1422 } 1423 1424 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1425 void *ctx) 1426 { 1427 struct ieee80211_local *local; 1428 struct txq_info *txqi; 1429 struct fq *fq; 1430 struct fq_flow *flow; 1431 1432 txqi = ctx; 1433 local = vif_to_sdata(txqi->txq.vif)->local; 1434 fq = &local->fq; 1435 1436 if (cvars == &txqi->def_cvars) 1437 flow = &txqi->tin.default_flow; 1438 else 1439 flow = &fq->flows[cvars - local->cvars]; 1440 1441 return fq_flow_dequeue(fq, flow); 1442 } 1443 1444 static void codel_drop_func(struct sk_buff *skb, 1445 void *ctx) 1446 { 1447 struct ieee80211_local *local; 1448 struct ieee80211_hw *hw; 1449 struct txq_info *txqi; 1450 1451 txqi = ctx; 1452 local = vif_to_sdata(txqi->txq.vif)->local; 1453 hw = &local->hw; 1454 1455 ieee80211_free_txskb(hw, skb); 1456 } 1457 1458 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1459 struct fq_tin *tin, 1460 struct fq_flow *flow) 1461 { 1462 struct ieee80211_local *local; 1463 struct txq_info *txqi; 1464 struct codel_vars *cvars; 1465 struct codel_params *cparams; 1466 struct codel_stats *cstats; 1467 1468 local = container_of(fq, struct ieee80211_local, fq); 1469 txqi = container_of(tin, struct txq_info, tin); 1470 cparams = &local->cparams; 1471 cstats = &txqi->cstats; 1472 1473 if (flow == &tin->default_flow) 1474 cvars = &txqi->def_cvars; 1475 else 1476 cvars = &local->cvars[flow - fq->flows]; 1477 1478 return codel_dequeue(txqi, 1479 &flow->backlog, 1480 cparams, 1481 cvars, 1482 cstats, 1483 codel_skb_len_func, 1484 codel_skb_time_func, 1485 codel_drop_func, 1486 codel_dequeue_func); 1487 } 1488 1489 static void fq_skb_free_func(struct fq *fq, 1490 struct fq_tin *tin, 1491 struct fq_flow *flow, 1492 struct sk_buff *skb) 1493 { 1494 struct ieee80211_local *local; 1495 1496 local = container_of(fq, struct ieee80211_local, fq); 1497 ieee80211_free_txskb(&local->hw, skb); 1498 } 1499 1500 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1501 struct txq_info *txqi, 1502 struct sk_buff *skb) 1503 { 1504 struct fq *fq = &local->fq; 1505 struct fq_tin *tin = &txqi->tin; 1506 u32 flow_idx; 1507 1508 ieee80211_set_skb_enqueue_time(skb); 1509 1510 spin_lock_bh(&fq->lock); 1511 /* 1512 * For management frames, don't really apply codel etc., 1513 * we don't want to apply any shaping or anything we just 1514 * want to simplify the driver API by having them on the 1515 * txqi. 1516 */ 1517 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1518 IEEE80211_SKB_CB(skb)->control.flags |= 1519 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1520 __skb_queue_tail(&txqi->frags, skb); 1521 } else { 1522 flow_idx = fq_flow_idx(fq, skb); 1523 fq_tin_enqueue(fq, tin, flow_idx, skb, 1524 fq_skb_free_func); 1525 } 1526 spin_unlock_bh(&fq->lock); 1527 } 1528 1529 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1530 struct fq_flow *flow, struct sk_buff *skb, 1531 void *data) 1532 { 1533 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1534 1535 return info->control.vif == data; 1536 } 1537 1538 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1539 struct ieee80211_sub_if_data *sdata) 1540 { 1541 struct fq *fq = &local->fq; 1542 struct txq_info *txqi; 1543 struct fq_tin *tin; 1544 struct ieee80211_sub_if_data *ap; 1545 1546 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1547 return; 1548 1549 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1550 1551 if (!ap->vif.txq) 1552 return; 1553 1554 txqi = to_txq_info(ap->vif.txq); 1555 tin = &txqi->tin; 1556 1557 spin_lock_bh(&fq->lock); 1558 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1559 fq_skb_free_func); 1560 spin_unlock_bh(&fq->lock); 1561 } 1562 1563 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1564 struct sta_info *sta, 1565 struct txq_info *txqi, int tid) 1566 { 1567 fq_tin_init(&txqi->tin); 1568 codel_vars_init(&txqi->def_cvars); 1569 codel_stats_init(&txqi->cstats); 1570 __skb_queue_head_init(&txqi->frags); 1571 INIT_LIST_HEAD(&txqi->schedule_order); 1572 1573 txqi->txq.vif = &sdata->vif; 1574 1575 if (!sta) { 1576 txqi->txq.tid = tid; 1577 1578 if (tid == IEEE80211_NUM_TIDS) { 1579 sdata->vif.txq_mgmt = &txqi->txq; 1580 txqi->txq.ac = IEEE80211_AC_VO; 1581 } else { 1582 sdata->vif.txq = &txqi->txq; 1583 txqi->txq.ac = IEEE80211_AC_BE; 1584 } 1585 1586 return; 1587 } 1588 1589 if (tid == IEEE80211_NUM_TIDS) { 1590 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1591 /* Drivers need to opt in to the management MPDU TXQ */ 1592 if (!ieee80211_hw_check(&sdata->local->hw, 1593 STA_MMPDU_TXQ)) 1594 return; 1595 } else if (!ieee80211_hw_check(&sdata->local->hw, 1596 BUFF_MMPDU_TXQ)) { 1597 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1598 return; 1599 } 1600 txqi->txq.ac = IEEE80211_AC_VO; 1601 } else { 1602 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1603 } 1604 1605 txqi->txq.sta = &sta->sta; 1606 txqi->txq.tid = tid; 1607 sta->sta.txq[tid] = &txqi->txq; 1608 } 1609 1610 void ieee80211_txq_purge(struct ieee80211_local *local, 1611 struct txq_info *txqi) 1612 { 1613 struct fq *fq = &local->fq; 1614 struct fq_tin *tin = &txqi->tin; 1615 1616 spin_lock_bh(&fq->lock); 1617 fq_tin_reset(fq, tin, fq_skb_free_func); 1618 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1619 spin_unlock_bh(&fq->lock); 1620 1621 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1622 list_del_init(&txqi->schedule_order); 1623 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1624 } 1625 1626 void ieee80211_txq_set_params(struct ieee80211_local *local, int radio_idx) 1627 { 1628 if (local->hw.wiphy->txq_limit) 1629 local->fq.limit = local->hw.wiphy->txq_limit; 1630 else 1631 local->hw.wiphy->txq_limit = local->fq.limit; 1632 1633 if (local->hw.wiphy->txq_memory_limit) 1634 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1635 else 1636 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1637 1638 if (local->hw.wiphy->txq_quantum) 1639 local->fq.quantum = local->hw.wiphy->txq_quantum; 1640 else 1641 local->hw.wiphy->txq_quantum = local->fq.quantum; 1642 } 1643 1644 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1645 { 1646 struct fq *fq = &local->fq; 1647 int ret; 1648 int i; 1649 bool supp_vht = false; 1650 enum nl80211_band band; 1651 1652 ret = fq_init(fq, 4096); 1653 if (ret) 1654 return ret; 1655 1656 /* 1657 * If the hardware doesn't support VHT, it is safe to limit the maximum 1658 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1659 */ 1660 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1661 struct ieee80211_supported_band *sband; 1662 1663 sband = local->hw.wiphy->bands[band]; 1664 if (!sband) 1665 continue; 1666 1667 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1668 } 1669 1670 if (!supp_vht) 1671 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1672 1673 codel_params_init(&local->cparams); 1674 local->cparams.interval = MS2TIME(100); 1675 local->cparams.target = MS2TIME(20); 1676 local->cparams.ecn = true; 1677 1678 local->cvars = kvzalloc_objs(local->cvars[0], fq->flows_cnt); 1679 if (!local->cvars) { 1680 spin_lock_bh(&fq->lock); 1681 fq_reset(fq, fq_skb_free_func); 1682 spin_unlock_bh(&fq->lock); 1683 return -ENOMEM; 1684 } 1685 1686 for (i = 0; i < fq->flows_cnt; i++) 1687 codel_vars_init(&local->cvars[i]); 1688 1689 ieee80211_txq_set_params(local, -1); 1690 1691 return 0; 1692 } 1693 1694 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1695 { 1696 struct fq *fq = &local->fq; 1697 1698 kvfree(local->cvars); 1699 local->cvars = NULL; 1700 1701 spin_lock_bh(&fq->lock); 1702 fq_reset(fq, fq_skb_free_func); 1703 spin_unlock_bh(&fq->lock); 1704 } 1705 1706 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1707 struct ieee80211_sub_if_data *sdata, 1708 struct sta_info *sta, 1709 struct sk_buff *skb) 1710 { 1711 struct ieee80211_vif *vif; 1712 struct txq_info *txqi; 1713 1714 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1715 return false; 1716 1717 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1718 sdata = container_of(sdata->bss, 1719 struct ieee80211_sub_if_data, u.ap); 1720 1721 vif = &sdata->vif; 1722 txqi = ieee80211_get_txq(local, vif, sta, skb); 1723 1724 if (!txqi) 1725 return false; 1726 1727 ieee80211_txq_enqueue(local, txqi, skb); 1728 1729 schedule_and_wake_txq(local, txqi); 1730 1731 return true; 1732 } 1733 1734 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1735 struct ieee80211_vif *vif, 1736 struct sta_info *sta, 1737 struct sk_buff_head *skbs, 1738 bool txpending) 1739 { 1740 struct ieee80211_tx_control control = {}; 1741 struct sk_buff *skb, *tmp; 1742 unsigned long flags; 1743 1744 skb_queue_walk_safe(skbs, skb, tmp) { 1745 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1746 int q = info->hw_queue; 1747 1748 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1749 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1750 __skb_unlink(skb, skbs); 1751 ieee80211_free_txskb(&local->hw, skb); 1752 continue; 1753 } 1754 #endif 1755 1756 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1757 if (local->queue_stop_reasons[q] || 1758 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1759 if (unlikely(info->flags & 1760 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1761 if (local->queue_stop_reasons[q] & 1762 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1763 /* 1764 * Drop off-channel frames if queues 1765 * are stopped for any reason other 1766 * than off-channel operation. Never 1767 * queue them. 1768 */ 1769 spin_unlock_irqrestore( 1770 &local->queue_stop_reason_lock, 1771 flags); 1772 ieee80211_purge_tx_queue(&local->hw, 1773 skbs); 1774 return true; 1775 } 1776 } else { 1777 1778 /* 1779 * Since queue is stopped, queue up frames for 1780 * later transmission from the tx-pending 1781 * tasklet when the queue is woken again. 1782 */ 1783 if (txpending) 1784 skb_queue_splice_init(skbs, 1785 &local->pending[q]); 1786 else 1787 skb_queue_splice_tail_init(skbs, 1788 &local->pending[q]); 1789 1790 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1791 flags); 1792 return false; 1793 } 1794 } 1795 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1796 1797 info->control.vif = vif; 1798 control.sta = sta ? &sta->sta : NULL; 1799 1800 __skb_unlink(skb, skbs); 1801 drv_tx(local, &control, skb); 1802 } 1803 1804 return true; 1805 } 1806 1807 /* 1808 * Returns false if the frame couldn't be transmitted but was queued instead. 1809 */ 1810 static bool __ieee80211_tx(struct ieee80211_local *local, 1811 struct sk_buff_head *skbs, struct sta_info *sta, 1812 bool txpending) 1813 { 1814 struct ieee80211_tx_info *info; 1815 struct ieee80211_sub_if_data *sdata; 1816 struct ieee80211_vif *vif; 1817 struct sk_buff *skb; 1818 bool result; 1819 1820 if (WARN_ON(skb_queue_empty(skbs))) 1821 return true; 1822 1823 skb = skb_peek(skbs); 1824 info = IEEE80211_SKB_CB(skb); 1825 sdata = vif_to_sdata(info->control.vif); 1826 if (sta && !sta->uploaded) 1827 sta = NULL; 1828 1829 switch (sdata->vif.type) { 1830 case NL80211_IFTYPE_MONITOR: 1831 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 1832 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 1833 vif = &sdata->vif; 1834 break; 1835 } 1836 sdata = rcu_dereference(local->monitor_sdata); 1837 if (sdata && ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 1838 vif = &sdata->vif; 1839 info->hw_queue = 1840 vif->hw_queue[skb_get_queue_mapping(skb)]; 1841 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1842 ieee80211_purge_tx_queue(&local->hw, skbs); 1843 return true; 1844 } else 1845 vif = NULL; 1846 break; 1847 case NL80211_IFTYPE_AP_VLAN: 1848 sdata = container_of(sdata->bss, 1849 struct ieee80211_sub_if_data, u.ap); 1850 fallthrough; 1851 default: 1852 vif = &sdata->vif; 1853 break; 1854 } 1855 1856 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1857 1858 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1859 1860 return result; 1861 } 1862 1863 /* 1864 * Invoke TX handlers, return 0 on success and non-zero if the 1865 * frame was dropped or queued. 1866 * 1867 * The handlers are split into an early and late part. The latter is everything 1868 * that can be sensitive to reordering, and will be deferred to after packets 1869 * are dequeued from the intermediate queues (when they are enabled). 1870 */ 1871 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1872 { 1873 ieee80211_tx_result res = TX_DROP; 1874 1875 #define CALL_TXH(txh) \ 1876 do { \ 1877 res = txh(tx); \ 1878 if (res != TX_CONTINUE) \ 1879 goto txh_done; \ 1880 } while (0) 1881 1882 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1883 CALL_TXH(ieee80211_tx_h_check_assoc); 1884 CALL_TXH(ieee80211_tx_h_ps_buf); 1885 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1886 CALL_TXH(ieee80211_tx_h_select_key); 1887 1888 txh_done: 1889 if (unlikely(res == TX_DROP)) { 1890 tx->sdata->tx_handlers_drop++; 1891 if (tx->skb) 1892 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1893 else 1894 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1895 return -1; 1896 } else if (unlikely(res == TX_QUEUED)) { 1897 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1898 return -1; 1899 } 1900 1901 return 0; 1902 } 1903 1904 /* 1905 * Late handlers can be called while the sta lock is held. Handlers that can 1906 * cause packets to be generated will cause deadlock! 1907 */ 1908 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1909 { 1910 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1911 ieee80211_tx_result res = TX_CONTINUE; 1912 1913 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1914 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1915 1916 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1917 __skb_queue_tail(&tx->skbs, tx->skb); 1918 tx->skb = NULL; 1919 goto txh_done; 1920 } 1921 1922 CALL_TXH(ieee80211_tx_h_check_offchannel); 1923 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1924 CALL_TXH(ieee80211_tx_h_sequence); 1925 CALL_TXH(ieee80211_tx_h_fragment); 1926 /* handlers after fragment must be aware of tx info fragmentation! */ 1927 CALL_TXH(ieee80211_tx_h_stats); 1928 CALL_TXH(ieee80211_tx_h_encrypt); 1929 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1930 CALL_TXH(ieee80211_tx_h_calculate_duration); 1931 #undef CALL_TXH 1932 1933 txh_done: 1934 if (unlikely(res == TX_DROP)) { 1935 tx->sdata->tx_handlers_drop++; 1936 if (tx->skb) 1937 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1938 else 1939 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1940 return -1; 1941 } else if (unlikely(res == TX_QUEUED)) { 1942 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1943 return -1; 1944 } 1945 1946 return 0; 1947 } 1948 1949 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1950 { 1951 int r = invoke_tx_handlers_early(tx); 1952 1953 if (r) 1954 return r; 1955 return invoke_tx_handlers_late(tx); 1956 } 1957 1958 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1959 struct ieee80211_vif *vif, struct sk_buff *skb, 1960 int band, struct ieee80211_sta **sta) 1961 { 1962 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1963 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1964 struct ieee80211_tx_data tx; 1965 struct sk_buff *skb2; 1966 1967 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) { 1968 kfree_skb(skb); 1969 return false; 1970 } 1971 1972 info->band = band; 1973 info->control.vif = vif; 1974 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1975 1976 if (invoke_tx_handlers(&tx)) 1977 return false; 1978 1979 if (sta) { 1980 if (tx.sta) 1981 *sta = &tx.sta->sta; 1982 else 1983 *sta = NULL; 1984 } 1985 1986 /* this function isn't suitable for fragmented data frames */ 1987 skb2 = __skb_dequeue(&tx.skbs); 1988 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1989 ieee80211_free_txskb(hw, skb2); 1990 ieee80211_purge_tx_queue(hw, &tx.skbs); 1991 return false; 1992 } 1993 1994 return true; 1995 } 1996 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1997 1998 /* 1999 * Returns false if the frame couldn't be transmitted but was queued instead. 2000 */ 2001 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 2002 struct sta_info *sta, struct sk_buff *skb, 2003 bool txpending) 2004 { 2005 struct ieee80211_local *local = sdata->local; 2006 struct ieee80211_tx_data tx; 2007 ieee80211_tx_result res_prepare; 2008 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2009 bool result = true; 2010 2011 if (unlikely(skb->len < 10)) { 2012 dev_kfree_skb(skb); 2013 return true; 2014 } 2015 2016 /* initialises tx */ 2017 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 2018 2019 if (unlikely(res_prepare == TX_DROP)) { 2020 ieee80211_free_txskb(&local->hw, skb); 2021 tx.sdata->tx_handlers_drop++; 2022 return true; 2023 } else if (unlikely(res_prepare == TX_QUEUED)) { 2024 return true; 2025 } 2026 2027 /* set up hw_queue value early */ 2028 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 2029 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 2030 info->hw_queue = 2031 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 2032 2033 if (invoke_tx_handlers_early(&tx)) 2034 return true; 2035 2036 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 2037 return true; 2038 2039 if (!invoke_tx_handlers_late(&tx)) 2040 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 2041 2042 return result; 2043 } 2044 2045 /* device xmit handlers */ 2046 2047 enum ieee80211_encrypt { 2048 ENCRYPT_NO, 2049 ENCRYPT_MGMT, 2050 ENCRYPT_DATA, 2051 }; 2052 2053 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 2054 struct sk_buff *skb, 2055 int head_need, 2056 enum ieee80211_encrypt encrypt) 2057 { 2058 struct ieee80211_local *local = sdata->local; 2059 bool enc_tailroom; 2060 int tail_need = 0; 2061 2062 enc_tailroom = encrypt == ENCRYPT_MGMT || 2063 (encrypt == ENCRYPT_DATA && 2064 sdata->crypto_tx_tailroom_needed_cnt); 2065 2066 if (enc_tailroom) { 2067 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2068 tail_need -= skb_tailroom(skb); 2069 tail_need = max_t(int, tail_need, 0); 2070 } 2071 2072 if (skb_cloned(skb) && 2073 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2074 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2075 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2076 else if (head_need || tail_need) 2077 I802_DEBUG_INC(local->tx_expand_skb_head); 2078 else 2079 return 0; 2080 2081 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2082 wiphy_debug(local->hw.wiphy, 2083 "failed to reallocate TX buffer\n"); 2084 return -ENOMEM; 2085 } 2086 2087 return 0; 2088 } 2089 2090 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2091 struct sta_info *sta, struct sk_buff *skb) 2092 { 2093 struct ieee80211_local *local = sdata->local; 2094 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2095 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2096 int headroom; 2097 enum ieee80211_encrypt encrypt; 2098 2099 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2100 encrypt = ENCRYPT_NO; 2101 else if (ieee80211_is_mgmt(hdr->frame_control)) 2102 encrypt = ENCRYPT_MGMT; 2103 else 2104 encrypt = ENCRYPT_DATA; 2105 2106 headroom = local->tx_headroom; 2107 if (encrypt != ENCRYPT_NO) 2108 headroom += IEEE80211_ENCRYPT_HEADROOM; 2109 headroom -= skb_headroom(skb); 2110 headroom = max_t(int, 0, headroom); 2111 2112 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2113 ieee80211_free_txskb(&local->hw, skb); 2114 return; 2115 } 2116 2117 /* reload after potential resize */ 2118 hdr = (struct ieee80211_hdr *) skb->data; 2119 info->control.vif = &sdata->vif; 2120 2121 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2122 if (ieee80211_is_data(hdr->frame_control) && 2123 is_unicast_ether_addr(hdr->addr1)) { 2124 if (mesh_nexthop_resolve(sdata, skb)) 2125 return; /* skb queued: don't free */ 2126 } else { 2127 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2128 } 2129 } 2130 2131 ieee80211_set_qos_hdr(sdata, skb); 2132 ieee80211_tx(sdata, sta, skb, false); 2133 } 2134 2135 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2136 { 2137 struct ieee80211_radiotap_header *rthdr = 2138 (struct ieee80211_radiotap_header *)skb->data; 2139 2140 /* check for not even having the fixed radiotap header part */ 2141 if (unlikely(skb_headlen(skb) < sizeof(struct ieee80211_radiotap_header))) 2142 return false; /* too short to be possibly valid */ 2143 2144 /* is it a header version we can trust to find length from? */ 2145 if (unlikely(rthdr->it_version)) 2146 return false; /* only version 0 is supported */ 2147 2148 /* does the skb contain enough to deliver on the alleged length? */ 2149 if (unlikely(skb_headlen(skb) < ieee80211_get_radiotap_len(skb->data))) 2150 return false; /* skb too short for claimed rt header extent */ 2151 2152 return true; 2153 } 2154 2155 static bool ieee80211_rate_bw_usable(u16 rate_flags, 2156 const struct cfg80211_chan_def *chandef) 2157 { 2158 int width; 2159 2160 if (!chandef) 2161 return true; 2162 2163 if (rate_flags & IEEE80211_TX_RC_160_MHZ_WIDTH) 2164 width = 160; 2165 else if (rate_flags & IEEE80211_TX_RC_80_MHZ_WIDTH) 2166 width = 80; 2167 else if (rate_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 2168 width = 40; 2169 else 2170 return true; 2171 2172 return width <= cfg80211_chandef_get_width(chandef); 2173 } 2174 2175 static bool 2176 ieee80211_vht_tx_rate_supported(const struct ieee80211_sta_vht_cap *vht_cap, 2177 u8 mcs, u8 nss) 2178 { 2179 u16 map = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); 2180 2181 if (!vht_cap->vht_supported) 2182 return false; 2183 2184 switch ((map >> (2 * (nss - 1))) & 3) { 2185 case IEEE80211_VHT_MCS_SUPPORT_0_7: 2186 return mcs <= 7; 2187 case IEEE80211_VHT_MCS_SUPPORT_0_8: 2188 return mcs <= 8; 2189 case IEEE80211_VHT_MCS_SUPPORT_0_9: 2190 return mcs <= 9; 2191 default: 2192 return false; 2193 } 2194 } 2195 2196 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2197 struct net_device *dev, 2198 const struct cfg80211_chan_def *chandef, 2199 bool trim_fcs) 2200 { 2201 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2202 struct ieee80211_radiotap_iterator iterator; 2203 struct ieee80211_radiotap_header *rthdr = 2204 (struct ieee80211_radiotap_header *) skb->data; 2205 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2206 u16 txflags; 2207 u16 rate = 0; 2208 bool rate_found = false; 2209 u8 rate_retries = 0; 2210 u16 rate_flags = 0; 2211 u8 mcs_known, mcs_flags, mcs_bw; 2212 u16 vht_known; 2213 u8 vht_mcs = 0, vht_nss = 0; 2214 int ret, i; 2215 2216 if (!ieee80211_validate_radiotap_len(skb)) 2217 return false; 2218 2219 ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2220 NULL); 2221 2222 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2223 IEEE80211_TX_CTL_DONTFRAG; 2224 2225 /* 2226 * for every radiotap entry that is present 2227 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2228 * entries present, or -EINVAL on error) 2229 */ 2230 2231 while (!ret) { 2232 ret = ieee80211_radiotap_iterator_next(&iterator); 2233 2234 if (ret) 2235 continue; 2236 2237 /* see if this argument is something we can use */ 2238 switch (iterator.this_arg_index) { 2239 /* 2240 * You must take care when dereferencing iterator.this_arg 2241 * for multibyte types... the pointer is not aligned. Use 2242 * get_unaligned((type *)iterator.this_arg) to dereference 2243 * iterator.this_arg for type "type" safely on all arches. 2244 */ 2245 case IEEE80211_RADIOTAP_FLAGS: 2246 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2247 /* 2248 * this indicates that the skb we have been 2249 * handed has the 32-bit FCS CRC at the end... 2250 * we should react to that by snipping it off 2251 * because it will be recomputed and added 2252 * on transmission 2253 */ 2254 if (skb->len < (iterator._max_length + FCS_LEN)) 2255 return false; 2256 2257 if (trim_fcs) 2258 skb_trim(skb, skb->len - FCS_LEN); 2259 } 2260 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2261 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2262 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2263 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2264 break; 2265 2266 case IEEE80211_RADIOTAP_TX_FLAGS: 2267 txflags = get_unaligned_le16(iterator.this_arg); 2268 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2269 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2270 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2271 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2272 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2273 info->control.flags |= 2274 IEEE80211_TX_CTRL_DONT_REORDER; 2275 break; 2276 2277 case IEEE80211_RADIOTAP_RATE: 2278 rate = *iterator.this_arg; 2279 rate_flags = 0; 2280 rate_found = true; 2281 break; 2282 2283 case IEEE80211_RADIOTAP_ANTENNA: 2284 /* this can appear multiple times, keep a bitmap */ 2285 /* control.antennas is only a 2-bit bitmap */ 2286 if (*iterator.this_arg < 2) 2287 info->control.antennas |= BIT(*iterator.this_arg); 2288 break; 2289 2290 case IEEE80211_RADIOTAP_DATA_RETRIES: 2291 rate_retries = *iterator.this_arg; 2292 break; 2293 2294 case IEEE80211_RADIOTAP_MCS: 2295 mcs_known = iterator.this_arg[0]; 2296 mcs_flags = iterator.this_arg[1]; 2297 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2298 break; 2299 2300 rate_found = true; 2301 rate = iterator.this_arg[2]; 2302 rate_flags = IEEE80211_TX_RC_MCS; 2303 2304 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2305 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2306 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2307 2308 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2309 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2310 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2311 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2312 2313 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2314 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2315 info->flags |= IEEE80211_TX_CTL_LDPC; 2316 2317 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2318 u8 stbc = u8_get_bits(mcs_flags, 2319 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2320 2321 info->flags |= 2322 u32_encode_bits(stbc, 2323 IEEE80211_TX_CTL_STBC); 2324 } 2325 break; 2326 2327 case IEEE80211_RADIOTAP_VHT: 2328 vht_known = get_unaligned_le16(iterator.this_arg); 2329 rate_found = true; 2330 2331 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2332 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2333 (iterator.this_arg[2] & 2334 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2335 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2336 if (vht_known & 2337 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2338 if (iterator.this_arg[3] == 1) 2339 rate_flags |= 2340 IEEE80211_TX_RC_40_MHZ_WIDTH; 2341 else if (iterator.this_arg[3] == 4) 2342 rate_flags |= 2343 IEEE80211_TX_RC_80_MHZ_WIDTH; 2344 else if (iterator.this_arg[3] == 11) 2345 rate_flags |= 2346 IEEE80211_TX_RC_160_MHZ_WIDTH; 2347 } 2348 2349 vht_mcs = iterator.this_arg[4] >> 4; 2350 if (vht_mcs > 11) 2351 vht_mcs = 0; 2352 vht_nss = iterator.this_arg[4] & 0xF; 2353 if (!vht_nss || vht_nss > 8) 2354 vht_nss = 1; 2355 break; 2356 2357 /* 2358 * Please update the file 2359 * Documentation/networking/mac80211-injection.rst 2360 * when parsing new fields here. 2361 */ 2362 2363 default: 2364 break; 2365 } 2366 } 2367 2368 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2369 return false; 2370 2371 if (rate_found) { 2372 struct ieee80211_supported_band *sband = 2373 local->hw.wiphy->bands[info->band]; 2374 2375 if (!ieee80211_rate_bw_usable(rate_flags, chandef)) 2376 return false; 2377 2378 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2379 2380 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2381 info->control.rates[i].idx = -1; 2382 info->control.rates[i].flags = 0; 2383 info->control.rates[i].count = 0; 2384 } 2385 2386 if (rate_flags & IEEE80211_TX_RC_MCS) { 2387 /* reset antennas if not enough */ 2388 if (IEEE80211_HT_MCS_CHAINS(rate) > 2389 hweight8(info->control.antennas)) 2390 info->control.antennas = 0; 2391 2392 /* MCS 32 and up aren't handled, e.g. by TX status */ 2393 if (sband && sband->ht_cap.ht_supported && rate < 32 && 2394 sband->ht_cap.mcs.rx_mask[rate / 8] & BIT(rate % 8)) 2395 info->control.rates[0].idx = rate; 2396 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2397 /* reset antennas if not enough */ 2398 if (vht_nss > hweight8(info->control.antennas)) 2399 info->control.antennas = 0; 2400 2401 if (sband && 2402 ieee80211_vht_tx_rate_supported(&sband->vht_cap, 2403 vht_mcs, vht_nss)) 2404 ieee80211_rate_set_vht(info->control.rates, 2405 vht_mcs, vht_nss); 2406 } else if (sband) { 2407 for (i = 0; i < sband->n_bitrates; i++) { 2408 if (rate * 5 != sband->bitrates[i].bitrate) 2409 continue; 2410 2411 info->control.rates[0].idx = i; 2412 break; 2413 } 2414 } 2415 2416 if (info->control.rates[0].idx < 0) 2417 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2418 2419 info->control.rates[0].flags = rate_flags; 2420 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2421 local->hw.max_rate_tries); 2422 } 2423 2424 return true; 2425 } 2426 2427 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2428 struct net_device *dev) 2429 { 2430 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2431 struct ieee80211_chanctx_conf *chanctx_conf; 2432 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2433 struct ieee80211_hdr *hdr; 2434 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2435 struct cfg80211_chan_def *chandef; 2436 u16 len_rthdr; 2437 int hdrlen; 2438 2439 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2440 if (unlikely(!ieee80211_sdata_running(sdata))) 2441 goto fail; 2442 2443 memset(info, 0, sizeof(*info)); 2444 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2445 IEEE80211_TX_CTL_INJECTED; 2446 2447 /* Sanity-check the length of the radiotap header */ 2448 if (!ieee80211_validate_radiotap_len(skb)) 2449 goto fail; 2450 2451 /* we now know there is a radiotap header with a length we can use */ 2452 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2453 2454 /* 2455 * fix up the pointers accounting for the radiotap 2456 * header still being in there. We are being given 2457 * a precooked IEEE80211 header so no need for 2458 * normal processing 2459 */ 2460 skb_set_mac_header(skb, len_rthdr); 2461 /* 2462 * these are just fixed to the end of the rt area since we 2463 * don't have any better information and at this point, nobody cares 2464 */ 2465 skb_set_network_header(skb, len_rthdr); 2466 skb_set_transport_header(skb, len_rthdr); 2467 2468 if (skb_headlen(skb) < len_rthdr + 2) 2469 goto fail; 2470 2471 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2472 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2473 2474 if (skb_headlen(skb) < len_rthdr + 2475 max_t(int, hdrlen, 2476 offsetofend(struct ieee80211_hdr, addr1))) 2477 goto fail; 2478 2479 /* 2480 * Initialize skb->protocol if the injected frame is a data frame 2481 * carrying a rfc1042 header 2482 */ 2483 if (ieee80211_is_data(hdr->frame_control) && 2484 skb_headlen(skb) >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2485 u8 *payload = (u8 *)hdr + hdrlen; 2486 2487 if (ether_addr_equal(payload, rfc1042_header)) 2488 skb->protocol = cpu_to_be16((payload[6] << 8) | 2489 payload[7]); 2490 } 2491 2492 rcu_read_lock(); 2493 2494 /* 2495 * We process outgoing injected frames that have a local address 2496 * we handle as though they are non-injected frames. 2497 * This code here isn't entirely correct, the local MAC address 2498 * isn't always enough to find the interface to use; for proper 2499 * VLAN support we have an nl80211-based mechanism. 2500 * 2501 * This is necessary, for example, for old hostapd versions that 2502 * don't use nl80211-based management TX/RX. 2503 */ 2504 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2505 if (!ieee80211_sdata_running(tmp_sdata)) 2506 continue; 2507 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2508 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2509 continue; 2510 if (hdrlen >= offsetofend(struct ieee80211_hdr, addr2) && 2511 ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2512 sdata = tmp_sdata; 2513 break; 2514 } 2515 } 2516 2517 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2518 if (!chanctx_conf) { 2519 tmp_sdata = rcu_dereference(local->monitor_sdata); 2520 if (tmp_sdata) 2521 chanctx_conf = 2522 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2523 } 2524 2525 if (!chanctx_conf) { 2526 struct ieee80211_chanctx *ctx; 2527 bool first = true; 2528 2529 list_for_each_entry_rcu(ctx, &local->chanctx_list, list) { 2530 if (!first) 2531 goto fail_rcu; 2532 chanctx_conf = &ctx->conf; 2533 first = false; 2534 } 2535 } 2536 2537 if (chanctx_conf) 2538 chandef = &chanctx_conf->def; 2539 else 2540 goto fail_rcu; 2541 2542 /* 2543 * If driver/HW supports IEEE80211_CHAN_CAN_MONITOR we still 2544 * shouldn't transmit on disabled channels. 2545 */ 2546 if (!cfg80211_chandef_usable(local->hw.wiphy, chandef, 2547 IEEE80211_CHAN_DISABLED)) 2548 goto fail_rcu; 2549 2550 /* 2551 * Frame injection is not allowed if beaconing is not allowed 2552 * or if we need radar detection. Beaconing is usually not allowed when 2553 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2554 * Passive scan is also used in world regulatory domains where 2555 * your country is not known and as such it should be treated as 2556 * NO TX unless the channel is explicitly allowed in which case 2557 * your current regulatory domain would not have the passive scan 2558 * flag. 2559 * 2560 * Since AP mode uses monitor interfaces to inject/TX management 2561 * frames we can make AP mode the exception to this rule once it 2562 * supports radar detection as its implementation can deal with 2563 * radar detection by itself. We can do that later by adding a 2564 * monitor flag interfaces used for AP support. 2565 */ 2566 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2567 sdata->vif.type)) 2568 goto fail_rcu; 2569 2570 info->band = chandef->chan->band; 2571 2572 /* Initialize skb->priority according to frame type and TID class, 2573 * with respect to the sub interface that the frame will actually 2574 * be transmitted on. If the DONT_REORDER flag is set, the original 2575 * skb-priority is preserved to assure frames injected with this 2576 * flag are not reordered relative to each other. 2577 */ 2578 ieee80211_select_queue_80211(sdata, skb, hdr); 2579 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2580 2581 /* 2582 * Process the radiotap header. This will now take into account the 2583 * selected chandef above to accurately set injection rates and 2584 * retransmissions. 2585 */ 2586 if (!ieee80211_parse_tx_radiotap(skb, dev, chandef, true)) 2587 goto fail_rcu; 2588 2589 /* remove the injection radiotap header */ 2590 skb_pull(skb, len_rthdr); 2591 2592 ieee80211_xmit(sdata, NULL, skb); 2593 rcu_read_unlock(); 2594 2595 return NETDEV_TX_OK; 2596 2597 fail_rcu: 2598 rcu_read_unlock(); 2599 fail: 2600 dev_kfree_skb(skb); 2601 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2602 } 2603 2604 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2605 { 2606 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2607 2608 return ethertype == ETH_P_TDLS && 2609 skb_headlen(skb) > 14 && 2610 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2611 } 2612 2613 /* 2614 * Returns an error if the frame should be dropped, otherwise 2615 * the *sta_out pointer is filled: 2616 * - valid sta pointer: frame goes to that station 2617 * - NULL: frame will be unicast to a yet unknown station 2618 * - ERR_PTR(-ENOENT): frame will be group addressed 2619 */ 2620 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2621 struct sk_buff *skb, 2622 struct sta_info **sta_out, bool bss) 2623 { 2624 struct sta_info *sta; 2625 2626 switch (sdata->vif.type) { 2627 case NL80211_IFTYPE_AP_VLAN: 2628 sta = rcu_dereference(sdata->u.vlan.sta); 2629 if (sta) { 2630 *sta_out = sta; 2631 return 0; 2632 } else if (sdata->wdev.use_4addr) { 2633 return -ENOLINK; 2634 } 2635 fallthrough; 2636 case NL80211_IFTYPE_AP: 2637 case NL80211_IFTYPE_OCB: 2638 case NL80211_IFTYPE_ADHOC: 2639 if (is_multicast_ether_addr(skb->data)) { 2640 *sta_out = ERR_PTR(-ENOENT); 2641 return 0; 2642 } 2643 if (bss) 2644 sta = sta_info_get_bss(sdata, skb->data); 2645 else 2646 sta = sta_info_get(sdata, skb->data); 2647 break; 2648 #ifdef CONFIG_MAC80211_MESH 2649 case NL80211_IFTYPE_MESH_POINT: 2650 if (is_multicast_ether_addr(skb->data)) { 2651 *sta_out = ERR_PTR(-ENOENT); 2652 return 0; 2653 } 2654 /* determined much later */ 2655 *sta_out = NULL; 2656 return 0; 2657 #endif 2658 case NL80211_IFTYPE_STATION: 2659 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2660 sta = sta_info_get(sdata, skb->data); 2661 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2662 if (test_sta_flag(sta, 2663 WLAN_STA_TDLS_PEER_AUTH)) { 2664 *sta_out = sta; 2665 return 0; 2666 } 2667 2668 /* 2669 * TDLS link during setup - throw out frames to 2670 * peer. Allow TDLS-setup frames to unauthorized 2671 * peers for the special case of a link teardown 2672 * after a TDLS sta is removed due to being 2673 * unreachable. 2674 */ 2675 if (!ieee80211_is_tdls_setup(skb)) 2676 return -EINVAL; 2677 } 2678 2679 } 2680 2681 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2682 if (!sta) 2683 return -ENOLINK; 2684 break; 2685 case NL80211_IFTYPE_NAN_DATA: 2686 if (is_multicast_ether_addr(skb->data)) { 2687 *sta_out = ERR_PTR(-ENOENT); 2688 return 0; 2689 } 2690 sta = sta_info_get(sdata, skb->data); 2691 break; 2692 default: 2693 return -EINVAL; 2694 } 2695 2696 *sta_out = sta; 2697 return 0; 2698 } 2699 2700 static void ieee80211_store_ack_skb(struct ieee80211_local *local, 2701 struct sk_buff *skb, u64 cookie) 2702 { 2703 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2704 struct sk_buff *ack_skb; 2705 2706 if (skb->sk) 2707 ack_skb = skb_clone_sk(skb); 2708 else 2709 ack_skb = skb_clone(skb, GFP_ATOMIC); 2710 2711 if (ack_skb) { 2712 unsigned long flags; 2713 int id; 2714 2715 spin_lock_irqsave(&local->ack_status_lock, flags); 2716 id = idr_alloc(&local->ack_status_frames, ack_skb, 2717 1, 0x2000, GFP_ATOMIC); 2718 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2719 2720 if (id >= 0) { 2721 info->status_data = id; 2722 info->status_data_idr = 1; 2723 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2724 if (cookie) 2725 IEEE80211_SKB_CB(ack_skb)->ack.cookie = cookie; 2726 } else { 2727 kfree_skb(ack_skb); 2728 } 2729 } 2730 } 2731 2732 static int ieee80211_ap_tx_addr_get(struct ieee80211_sub_if_data *sdata, 2733 struct sta_info *sta, u8 *addr, u8 *link_id) 2734 { 2735 struct ieee80211_link_data *link; 2736 2737 if (!ieee80211_vif_is_mld(&sdata->vif) || sta->sta.mlo) { 2738 memcpy(addr, sdata->vif.addr, ETH_ALEN); 2739 return 0; 2740 } 2741 2742 guard(rcu)(); 2743 2744 link = rcu_dereference(sdata->link[sta->deflink.link_id]); 2745 if (WARN_ON(!link)) 2746 return -ENOLINK; 2747 2748 memcpy(addr, link->conf->addr, ETH_ALEN); 2749 if (link_id) 2750 *link_id = sta->deflink.link_id; 2751 2752 return 0; 2753 } 2754 2755 /** 2756 * ieee80211_build_hdr - build 802.11 header in the given frame 2757 * @sdata: virtual interface to build the header for 2758 * @skb: the skb to build the header in 2759 * @sta: the station pointer 2760 * 2761 * This function takes the skb with 802.3 header and reformats the header to 2762 * the appropriate IEEE 802.11 header based on which interface the packet is 2763 * being transmitted on. 2764 * 2765 * Note that this function also takes care of the TX status request. The skb 2766 * must not be shared, and its TX info must already be initialised - this 2767 * function only fills in what it determines itself. 2768 * 2769 * The function requires the read-side RCU lock held 2770 * 2771 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2772 */ 2773 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2774 struct sk_buff *skb, 2775 struct sta_info *sta) 2776 { 2777 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2778 struct ieee80211_local *local = sdata->local; 2779 int head_need; 2780 u16 ethertype, hdrlen, meshhdrlen = 0; 2781 __le16 fc; 2782 struct ieee80211_hdr hdr; 2783 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2784 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2785 const u8 *encaps_data; 2786 int encaps_len, skip_header_bytes; 2787 bool wme_sta = false, authorized = false; 2788 bool tdls_peer; 2789 bool multicast; 2790 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2791 enum nl80211_band band; 2792 int ret; 2793 u8 link_id = u32_get_bits(info->control.flags, 2794 IEEE80211_TX_CTRL_MLO_LINK); 2795 2796 if (IS_ERR(sta)) 2797 sta = NULL; 2798 2799 #ifdef CONFIG_MAC80211_DEBUGFS 2800 if (local->force_tx_status) 2801 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2802 #endif 2803 2804 /* convert Ethernet header to proper 802.11 header (based on 2805 * operation mode) */ 2806 ethertype = (skb->data[12] << 8) | skb->data[13]; 2807 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2808 2809 if (!ieee80211_vif_is_mld(&sdata->vif)) 2810 chanctx_conf = 2811 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2812 2813 switch (sdata->vif.type) { 2814 case NL80211_IFTYPE_AP_VLAN: 2815 if (sdata->wdev.use_4addr) { 2816 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2817 /* RA TA DA SA */ 2818 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2819 ret = ieee80211_ap_tx_addr_get(sdata, sta, hdr.addr2, 2820 &link_id); 2821 if (ret) 2822 goto free; 2823 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2824 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2825 hdrlen = 30; 2826 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2827 wme_sta = sta->sta.wme; 2828 } 2829 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2830 struct ieee80211_sub_if_data *ap_sdata; 2831 2832 /* override chanctx_conf from AP (we don't have one) */ 2833 ap_sdata = container_of(sdata->bss, 2834 struct ieee80211_sub_if_data, 2835 u.ap); 2836 chanctx_conf = 2837 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2838 } 2839 if (sdata->wdev.use_4addr) 2840 break; 2841 fallthrough; 2842 case NL80211_IFTYPE_AP: 2843 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2844 /* DA BSSID SA */ 2845 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2846 2847 if (sta) { 2848 ret = ieee80211_ap_tx_addr_get(sdata, sta, hdr.addr2, 2849 &link_id); 2850 if (ret) 2851 goto free; 2852 } else if (link_id == IEEE80211_LINK_UNSPECIFIED) { 2853 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2854 } else { 2855 struct ieee80211_bss_conf *conf; 2856 2857 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2858 if (unlikely(!conf)) { 2859 ret = -ENOLINK; 2860 goto free; 2861 } 2862 2863 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2864 } 2865 2866 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2867 hdrlen = 24; 2868 break; 2869 #ifdef CONFIG_MAC80211_MESH 2870 case NL80211_IFTYPE_MESH_POINT: 2871 if (!is_multicast_ether_addr(skb->data)) { 2872 struct sta_info *next_hop; 2873 bool mpp_lookup = true; 2874 2875 mpath = mesh_path_lookup(sdata, skb->data); 2876 if (mpath) { 2877 mpp_lookup = false; 2878 next_hop = rcu_dereference(mpath->next_hop); 2879 if (!next_hop || 2880 !(mpath->flags & (MESH_PATH_ACTIVE | 2881 MESH_PATH_RESOLVING))) 2882 mpp_lookup = true; 2883 } 2884 2885 if (mpp_lookup) { 2886 mppath = mpp_path_lookup(sdata, skb->data); 2887 if (mppath) 2888 mppath->exp_time = jiffies; 2889 } 2890 2891 if (mppath && mpath) 2892 mesh_path_del(sdata, mpath->dst); 2893 } 2894 2895 /* 2896 * Use address extension if it is a packet from 2897 * another interface or if we know the destination 2898 * is being proxied by a portal (i.e. portal address 2899 * differs from proxied address) 2900 */ 2901 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2902 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2903 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2904 skb->data, skb->data + ETH_ALEN); 2905 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2906 NULL, NULL); 2907 } else { 2908 /* DS -> MBSS (802.11-2012 13.11.3.3). 2909 * For unicast with unknown forwarding information, 2910 * destination might be in the MBSS or if that fails 2911 * forwarded to another mesh gate. In either case 2912 * resolution will be handled in ieee80211_xmit(), so 2913 * leave the original DA. This also works for mcast */ 2914 const u8 *mesh_da = skb->data; 2915 2916 if (mppath) 2917 mesh_da = mppath->mpp; 2918 else if (mpath) 2919 mesh_da = mpath->dst; 2920 2921 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2922 mesh_da, sdata->vif.addr); 2923 if (is_multicast_ether_addr(mesh_da)) 2924 /* DA TA mSA AE:SA */ 2925 meshhdrlen = ieee80211_new_mesh_header( 2926 sdata, &mesh_hdr, 2927 skb->data + ETH_ALEN, NULL); 2928 else 2929 /* RA TA mDA mSA AE:DA SA */ 2930 meshhdrlen = ieee80211_new_mesh_header( 2931 sdata, &mesh_hdr, skb->data, 2932 skb->data + ETH_ALEN); 2933 2934 } 2935 2936 /* For injected frames, fill RA right away as nexthop lookup 2937 * will be skipped. 2938 */ 2939 if ((info->control.flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2940 is_zero_ether_addr(hdr.addr1)) 2941 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2942 break; 2943 #endif 2944 case NL80211_IFTYPE_STATION: 2945 /* we already did checks when looking up the RA STA */ 2946 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2947 2948 if (tdls_peer) { 2949 /* For TDLS only one link can be valid with peer STA */ 2950 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 2951 struct ieee80211_link_data *link; 2952 2953 /* DA SA BSSID */ 2954 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2955 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2956 link = rcu_dereference(sdata->link[tdls_link_id]); 2957 if (WARN_ON_ONCE(!link)) { 2958 ret = -EINVAL; 2959 goto free; 2960 } 2961 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2962 hdrlen = 24; 2963 } else if (sdata->u.mgd.use_4addr && 2964 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2965 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2966 IEEE80211_FCTL_TODS); 2967 /* RA TA DA SA */ 2968 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2969 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2970 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2971 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2972 hdrlen = 30; 2973 } else { 2974 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2975 /* BSSID SA DA */ 2976 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2977 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2978 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2979 hdrlen = 24; 2980 } 2981 break; 2982 case NL80211_IFTYPE_OCB: 2983 /* DA SA BSSID */ 2984 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2985 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2986 eth_broadcast_addr(hdr.addr3); 2987 hdrlen = 24; 2988 break; 2989 case NL80211_IFTYPE_ADHOC: 2990 /* DA SA BSSID */ 2991 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2992 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2993 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2994 hdrlen = 24; 2995 break; 2996 case NL80211_IFTYPE_NAN_DATA: { 2997 struct ieee80211_sub_if_data *nmi; 2998 2999 /* DA SA Cluster ID */ 3000 memcpy(hdr.addr1, skb->data, ETH_ALEN); 3001 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 3002 nmi = rcu_dereference(sdata->u.nan_data.nmi); 3003 if (!nmi) { 3004 ret = -ENOTCONN; 3005 goto free; 3006 } 3007 memcpy(hdr.addr3, nmi->u.nan.conf.cluster_id, ETH_ALEN); 3008 hdrlen = 24; 3009 break; 3010 } 3011 default: 3012 ret = -EINVAL; 3013 goto free; 3014 } 3015 3016 if (!chanctx_conf) { 3017 if (sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 3018 /* NAN operates on multiple bands */ 3019 band = NUM_NL80211_BANDS; 3020 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 3021 ret = -ENOTCONN; 3022 goto free; 3023 } else { 3024 /* MLD transmissions must not rely on the band */ 3025 band = 0; 3026 } 3027 } else { 3028 band = chanctx_conf->def.chan->band; 3029 } 3030 3031 multicast = is_multicast_ether_addr(hdr.addr1); 3032 3033 /* sta is always NULL for mesh */ 3034 if (sta) { 3035 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 3036 wme_sta = sta->sta.wme; 3037 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 3038 /* For mesh, the use of the QoS header is mandatory */ 3039 wme_sta = true; 3040 } 3041 3042 /* receiver does QoS (which also means we do) use it */ 3043 if (wme_sta) { 3044 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3045 hdrlen += 2; 3046 } 3047 3048 /* 3049 * Drop unicast frames to unauthorised stations unless they are 3050 * EAPOL frames from the local station. 3051 */ 3052 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 3053 (sdata->vif.type != NL80211_IFTYPE_OCB) && 3054 !multicast && !authorized && 3055 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 3056 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 3057 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 3058 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 3059 sdata->name, hdr.addr1); 3060 #endif 3061 3062 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3063 3064 ret = -EPERM; 3065 goto free; 3066 } 3067 3068 hdr.frame_control = fc; 3069 hdr.duration_id = 0; 3070 hdr.seq_ctrl = 0; 3071 3072 skip_header_bytes = ETH_HLEN; 3073 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 3074 encaps_data = bridge_tunnel_header; 3075 encaps_len = sizeof(bridge_tunnel_header); 3076 skip_header_bytes -= 2; 3077 } else if (ethertype >= ETH_P_802_3_MIN) { 3078 encaps_data = rfc1042_header; 3079 encaps_len = sizeof(rfc1042_header); 3080 skip_header_bytes -= 2; 3081 } else { 3082 encaps_data = NULL; 3083 encaps_len = 0; 3084 } 3085 3086 skb_pull(skb, skip_header_bytes); 3087 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 3088 3089 /* 3090 * So we need to modify the skb header and hence need a copy of 3091 * that. The head_need variable above doesn't, so far, include 3092 * the needed header space that we don't need right away. If we 3093 * can, then we don't reallocate right now but only after the 3094 * frame arrives at the master device (if it does...) 3095 * 3096 * If we cannot, however, then we will reallocate to include all 3097 * the ever needed space. Also, if we need to reallocate it anyway, 3098 * make it big enough for everything we may ever need. 3099 */ 3100 3101 if (head_need > 0 || skb_cloned(skb)) { 3102 head_need += IEEE80211_ENCRYPT_HEADROOM; 3103 head_need += local->tx_headroom; 3104 head_need = max_t(int, 0, head_need); 3105 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 3106 ret = -ENOMEM; 3107 goto free; 3108 } 3109 } 3110 3111 if (encaps_data) 3112 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 3113 3114 #ifdef CONFIG_MAC80211_MESH 3115 if (meshhdrlen > 0) 3116 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 3117 #endif 3118 3119 if (ieee80211_is_data_qos(fc)) { 3120 __le16 *qos_control; 3121 3122 qos_control = skb_push(skb, 2); 3123 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 3124 /* 3125 * Maybe we could actually set some fields here, for now just 3126 * initialise to zero to indicate no special operation. 3127 */ 3128 *qos_control = 0; 3129 } else 3130 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 3131 3132 skb_reset_mac_header(skb); 3133 3134 info->band = band; 3135 3136 info->control.flags = 3137 u32_replace_bits(info->control.flags, link_id, 3138 IEEE80211_TX_CTRL_MLO_LINK); 3139 return skb; 3140 free: 3141 ieee80211_free_txskb(&local->hw, skb); 3142 return ERR_PTR(ret); 3143 } 3144 3145 /* 3146 * fast-xmit overview 3147 * 3148 * The core idea of this fast-xmit is to remove per-packet checks by checking 3149 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 3150 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3151 * much less work can be done per packet. For example, fragmentation must be 3152 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3153 * in the code here. 3154 * 3155 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3156 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3157 * 3158 * The most difficult part of this is that when any of these assumptions 3159 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3160 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3161 * since the per-packet code no longer checks the conditions. This is reflected 3162 * by the calls to these functions throughout the rest of the code, and must be 3163 * maintained if any of the TX path checks change. 3164 */ 3165 3166 void ieee80211_check_fast_xmit(struct sta_info *sta) 3167 { 3168 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3169 struct ieee80211_local *local = sta->local; 3170 struct ieee80211_sub_if_data *sdata = sta->sdata; 3171 struct ieee80211_hdr *hdr = (void *)build.hdr; 3172 struct ieee80211_chanctx_conf *chanctx_conf; 3173 __le16 fc; 3174 3175 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3176 return; 3177 3178 if (ieee80211_vif_is_mesh(&sdata->vif)) 3179 mesh_fast_tx_flush_sta(sdata, sta); 3180 3181 /* Locking here protects both the pointer itself, and against concurrent 3182 * invocations winning data access races to, e.g., the key pointer that 3183 * is used. 3184 * Without it, the invocation of this function right after the key 3185 * pointer changes wouldn't be sufficient, as another CPU could access 3186 * the pointer, then stall, and then do the cache update after the CPU 3187 * that invalidated the key. 3188 * With the locking, such scenarios cannot happen as the check for the 3189 * key and the fast-tx assignment are done atomically, so the CPU that 3190 * modifies the key will either wait or other one will see the key 3191 * cleared/changed already. 3192 */ 3193 spin_lock_bh(&sta->lock); 3194 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3195 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3196 sdata->vif.type == NL80211_IFTYPE_STATION) 3197 goto out; 3198 3199 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded) 3200 goto out; 3201 3202 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3203 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3204 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3205 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3206 goto out; 3207 3208 if (sdata->noack_map) 3209 goto out; 3210 3211 /* fast-xmit doesn't handle fragmentation at all */ 3212 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3213 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3214 goto out; 3215 3216 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3217 rcu_read_lock(); 3218 chanctx_conf = 3219 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3220 if (!chanctx_conf) { 3221 rcu_read_unlock(); 3222 goto out; 3223 } 3224 build.band = chanctx_conf->def.chan->band; 3225 rcu_read_unlock(); 3226 } else { 3227 /* MLD transmissions must not rely on the band */ 3228 build.band = 0; 3229 } 3230 3231 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3232 3233 switch (sdata->vif.type) { 3234 case NL80211_IFTYPE_ADHOC: 3235 /* DA SA BSSID */ 3236 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3237 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3238 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3239 build.hdr_len = 24; 3240 break; 3241 case NL80211_IFTYPE_STATION: 3242 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3243 /* For TDLS only one link can be valid with peer STA */ 3244 int tdls_link_id = ieee80211_tdls_sta_link_id(sta); 3245 struct ieee80211_link_data *link; 3246 3247 /* DA SA BSSID */ 3248 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3249 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3250 rcu_read_lock(); 3251 link = rcu_dereference(sdata->link[tdls_link_id]); 3252 if (!WARN_ON_ONCE(!link)) 3253 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3254 rcu_read_unlock(); 3255 build.hdr_len = 24; 3256 break; 3257 } 3258 3259 if (sdata->u.mgd.use_4addr) { 3260 /* non-regular ethertype cannot use the fastpath */ 3261 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3262 IEEE80211_FCTL_TODS); 3263 /* RA TA DA SA */ 3264 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3265 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3266 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3267 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3268 build.hdr_len = 30; 3269 break; 3270 } 3271 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3272 /* BSSID SA DA */ 3273 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3274 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3275 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3276 build.hdr_len = 24; 3277 break; 3278 case NL80211_IFTYPE_AP_VLAN: 3279 if (sdata->wdev.use_4addr) { 3280 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3281 IEEE80211_FCTL_TODS); 3282 /* RA TA DA SA */ 3283 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3284 if (ieee80211_ap_tx_addr_get(sdata, sta, hdr->addr2, 3285 NULL)) 3286 goto out; 3287 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3288 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3289 build.hdr_len = 30; 3290 break; 3291 } 3292 fallthrough; 3293 case NL80211_IFTYPE_AP: 3294 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3295 /* DA BSSID SA */ 3296 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3297 if (ieee80211_ap_tx_addr_get(sdata, sta, hdr->addr2, NULL)) 3298 goto out; 3299 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3300 build.hdr_len = 24; 3301 break; 3302 default: 3303 /* not handled on fast-xmit */ 3304 goto out; 3305 } 3306 3307 if (sta->sta.wme) { 3308 build.hdr_len += 2; 3309 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3310 } 3311 3312 /* We store the key here so there's no point in using rcu_dereference() 3313 * but that's fine because the code that changes the pointers will call 3314 * this function after doing so. For a single CPU that would be enough, 3315 * for multiple see the comment above. 3316 */ 3317 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3318 if (!build.key) 3319 build.key = rcu_access_pointer(sdata->default_unicast_key); 3320 if (build.key) { 3321 bool gen_iv, iv_spc, mmic; 3322 3323 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3324 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3325 mmic = build.key->conf.flags & 3326 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3327 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3328 3329 /* don't handle software crypto */ 3330 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3331 goto out; 3332 3333 /* Key is being removed */ 3334 if (build.key->flags & KEY_FLAG_TAINTED) 3335 goto out; 3336 3337 switch (build.key->conf.cipher) { 3338 case WLAN_CIPHER_SUITE_CCMP: 3339 case WLAN_CIPHER_SUITE_CCMP_256: 3340 if (gen_iv) 3341 build.pn_offs = build.hdr_len; 3342 if (gen_iv || iv_spc) 3343 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3344 break; 3345 case WLAN_CIPHER_SUITE_GCMP: 3346 case WLAN_CIPHER_SUITE_GCMP_256: 3347 if (gen_iv) 3348 build.pn_offs = build.hdr_len; 3349 if (gen_iv || iv_spc) 3350 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3351 break; 3352 case WLAN_CIPHER_SUITE_TKIP: 3353 /* cannot handle MMIC or IV generation in xmit-fast */ 3354 if (mmic || gen_iv) 3355 goto out; 3356 if (iv_spc) 3357 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3358 break; 3359 case WLAN_CIPHER_SUITE_WEP40: 3360 case WLAN_CIPHER_SUITE_WEP104: 3361 /* cannot handle IV generation in fast-xmit */ 3362 if (gen_iv) 3363 goto out; 3364 if (iv_spc) 3365 build.hdr_len += IEEE80211_WEP_IV_LEN; 3366 break; 3367 case WLAN_CIPHER_SUITE_AES_CMAC: 3368 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3369 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3370 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3371 WARN(1, 3372 "management cipher suite 0x%x enabled for data\n", 3373 build.key->conf.cipher); 3374 goto out; 3375 default: 3376 /* we don't know how to generate IVs for this at all */ 3377 if (WARN_ON(gen_iv)) 3378 goto out; 3379 } 3380 3381 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3382 } 3383 3384 hdr->frame_control = fc; 3385 3386 memcpy(build.hdr + build.hdr_len, 3387 rfc1042_header, sizeof(rfc1042_header)); 3388 build.hdr_len += sizeof(rfc1042_header); 3389 3390 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3391 /* if the kmemdup fails, continue w/o fast_tx */ 3392 3393 out: 3394 /* we might have raced against another call to this function */ 3395 old = rcu_dereference_protected(sta->fast_tx, 3396 lockdep_is_held(&sta->lock)); 3397 rcu_assign_pointer(sta->fast_tx, fast_tx); 3398 if (old) 3399 kfree_rcu(old, rcu_head); 3400 spin_unlock_bh(&sta->lock); 3401 } 3402 3403 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3404 { 3405 struct sta_info *sta; 3406 3407 rcu_read_lock(); 3408 list_for_each_entry_rcu(sta, &local->sta_list, list) 3409 ieee80211_check_fast_xmit(sta); 3410 rcu_read_unlock(); 3411 } 3412 3413 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3414 { 3415 struct ieee80211_local *local = sdata->local; 3416 struct sta_info *sta; 3417 3418 rcu_read_lock(); 3419 3420 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3421 if (sdata != sta->sdata && 3422 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3423 continue; 3424 ieee80211_check_fast_xmit(sta); 3425 } 3426 3427 rcu_read_unlock(); 3428 } 3429 3430 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3431 { 3432 struct ieee80211_fast_tx *fast_tx; 3433 3434 spin_lock_bh(&sta->lock); 3435 fast_tx = rcu_dereference_protected(sta->fast_tx, 3436 lockdep_is_held(&sta->lock)); 3437 RCU_INIT_POINTER(sta->fast_tx, NULL); 3438 spin_unlock_bh(&sta->lock); 3439 3440 if (fast_tx) 3441 kfree_rcu(fast_tx, rcu_head); 3442 } 3443 3444 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3445 struct sk_buff *skb, int headroom) 3446 { 3447 if (skb_headroom(skb) < headroom) { 3448 I802_DEBUG_INC(local->tx_expand_skb_head); 3449 3450 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3451 wiphy_debug(local->hw.wiphy, 3452 "failed to reallocate TX buffer\n"); 3453 return false; 3454 } 3455 } 3456 3457 return true; 3458 } 3459 3460 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3461 struct ieee80211_fast_tx *fast_tx, 3462 struct sk_buff *skb) 3463 { 3464 struct ieee80211_local *local = sdata->local; 3465 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3466 struct ieee80211_hdr *hdr; 3467 struct ethhdr *amsdu_hdr; 3468 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3469 int subframe_len = skb->len - hdr_len; 3470 void *data; 3471 u8 *qc, *h_80211_src, *h_80211_dst; 3472 const u8 *bssid; 3473 3474 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3475 return false; 3476 3477 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3478 return true; 3479 3480 if (!ieee80211_amsdu_realloc_pad(local, skb, 3481 sizeof(*amsdu_hdr) + 3482 local->hw.extra_tx_headroom)) 3483 return false; 3484 3485 data = skb_push(skb, sizeof(*amsdu_hdr)); 3486 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3487 hdr = data; 3488 amsdu_hdr = data + hdr_len; 3489 /* h_80211_src/dst is addr* field within hdr */ 3490 h_80211_src = data + fast_tx->sa_offs; 3491 h_80211_dst = data + fast_tx->da_offs; 3492 3493 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3494 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3495 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3496 3497 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3498 * fields needs to be changed to BSSID for A-MSDU frames depending 3499 * on FromDS/ToDS values. 3500 */ 3501 switch (sdata->vif.type) { 3502 case NL80211_IFTYPE_STATION: 3503 bssid = sdata->vif.cfg.ap_addr; 3504 break; 3505 case NL80211_IFTYPE_AP: 3506 case NL80211_IFTYPE_AP_VLAN: 3507 bssid = sdata->vif.addr; 3508 break; 3509 default: 3510 bssid = NULL; 3511 } 3512 3513 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3514 ether_addr_copy(h_80211_src, bssid); 3515 3516 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3517 ether_addr_copy(h_80211_dst, bssid); 3518 3519 qc = ieee80211_get_qos_ctl(hdr); 3520 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3521 3522 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3523 3524 return true; 3525 } 3526 3527 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3528 struct sta_info *sta, 3529 struct ieee80211_fast_tx *fast_tx, 3530 struct sk_buff *skb, 3531 const u8 *da, const u8 *sa) 3532 { 3533 struct ieee80211_local *local = sdata->local; 3534 struct fq *fq = &local->fq; 3535 struct fq_tin *tin; 3536 struct fq_flow *flow; 3537 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3538 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3539 struct txq_info *txqi; 3540 struct sk_buff **frag_tail, *head; 3541 int subframe_len = skb->len - ETH_ALEN; 3542 u8 max_subframes = sta->sta.max_amsdu_subframes; 3543 int max_frags = local->hw.max_tx_fragments; 3544 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3545 int orig_truesize; 3546 u32 flow_idx; 3547 __be16 len; 3548 void *data; 3549 bool ret = false; 3550 unsigned int orig_len; 3551 int n = 2, nfrags, pad = 0; 3552 u16 hdrlen; 3553 3554 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3555 return false; 3556 3557 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3558 return false; 3559 3560 if (ieee80211_vif_is_mesh(&sdata->vif)) 3561 return false; 3562 3563 if (skb_is_gso(skb)) 3564 return false; 3565 3566 if (!txq) 3567 return false; 3568 3569 txqi = to_txq_info(txq); 3570 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3571 return false; 3572 3573 if (sta->sta.cur->max_rc_amsdu_len) 3574 max_amsdu_len = min_t(int, max_amsdu_len, 3575 sta->sta.cur->max_rc_amsdu_len); 3576 3577 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3578 max_amsdu_len = min_t(int, max_amsdu_len, 3579 sta->sta.cur->max_tid_amsdu_len[tid]); 3580 3581 flow_idx = fq_flow_idx(fq, skb); 3582 3583 spin_lock_bh(&fq->lock); 3584 3585 /* TODO: Ideally aggregation should be done on dequeue to remain 3586 * responsive to environment changes. 3587 */ 3588 3589 tin = &txqi->tin; 3590 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3591 head = skb_peek_tail(&flow->queue); 3592 if (!head || skb_is_gso(head)) 3593 goto out; 3594 3595 orig_truesize = head->truesize; 3596 orig_len = head->len; 3597 3598 if (skb->len + head->len > max_amsdu_len) 3599 goto out; 3600 3601 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3602 nfrags += 1 + skb_shinfo(head)->nr_frags; 3603 frag_tail = &skb_shinfo(head)->frag_list; 3604 while (*frag_tail) { 3605 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3606 frag_tail = &(*frag_tail)->next; 3607 n++; 3608 } 3609 3610 if (max_subframes && n > max_subframes) 3611 goto out; 3612 3613 if (max_frags && nfrags > max_frags) 3614 goto out; 3615 3616 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3617 goto out; 3618 3619 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3620 goto out; 3621 3622 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3623 * and frag_tail should be &skb_shinfo(head)->frag_list. 3624 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3625 * Reload frag_tail to have it pointing to the correct place. 3626 */ 3627 if (n == 2) 3628 frag_tail = &skb_shinfo(head)->frag_list; 3629 3630 /* 3631 * Pad out the previous subframe to a multiple of 4 by adding the 3632 * padding to the next one, that's being added. Note that head->len 3633 * is the length of the full A-MSDU, but that works since each time 3634 * we add a new subframe we pad out the previous one to a multiple 3635 * of 4 and thus it no longer matters in the next round. 3636 */ 3637 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3638 if ((head->len - hdrlen) & 3) 3639 pad = 4 - ((head->len - hdrlen) & 3); 3640 3641 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3642 2 + pad)) 3643 goto out_recalc; 3644 3645 ret = true; 3646 data = skb_push(skb, ETH_ALEN + 2); 3647 ether_addr_copy(data, da); 3648 ether_addr_copy(data + ETH_ALEN, sa); 3649 3650 data += 2 * ETH_ALEN; 3651 len = cpu_to_be16(subframe_len); 3652 memcpy(data, &len, 2); 3653 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3654 3655 memset(skb_push(skb, pad), 0, pad); 3656 3657 head->len += skb->len; 3658 head->data_len += skb->len; 3659 *frag_tail = skb; 3660 3661 out_recalc: 3662 fq->memory_usage += head->truesize - orig_truesize; 3663 if (head->len != orig_len) { 3664 flow->backlog += head->len - orig_len; 3665 tin->backlog_bytes += head->len - orig_len; 3666 } 3667 out: 3668 spin_unlock_bh(&fq->lock); 3669 3670 return ret; 3671 } 3672 3673 /* 3674 * Can be called while the sta lock is held. Anything that can cause packets to 3675 * be generated will cause deadlock! 3676 */ 3677 static ieee80211_tx_result 3678 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3679 struct sta_info *sta, u8 pn_offs, 3680 struct ieee80211_key *key, 3681 struct ieee80211_tx_data *tx) 3682 { 3683 struct sk_buff *skb = tx->skb; 3684 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3685 struct ieee80211_hdr *hdr = (void *)skb->data; 3686 u8 tid = IEEE80211_NUM_TIDS; 3687 3688 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3689 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3690 return TX_DROP; 3691 3692 if (key) 3693 info->control.hw_key = &key->conf; 3694 3695 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3696 3697 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3698 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3699 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3700 } else { 3701 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3702 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3703 sdata->sequence_number += 0x10; 3704 } 3705 3706 if (skb_shinfo(skb)->gso_size) 3707 sta->deflink.tx_stats.msdu[tid] += 3708 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3709 else 3710 sta->deflink.tx_stats.msdu[tid]++; 3711 3712 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3713 3714 /* statistics normally done by ieee80211_tx_h_stats (but that 3715 * has to consider fragmentation, so is more complex) 3716 */ 3717 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3718 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3719 3720 if (pn_offs) { 3721 u64 pn; 3722 u8 *crypto_hdr = skb->data + pn_offs; 3723 3724 switch (key->conf.cipher) { 3725 case WLAN_CIPHER_SUITE_CCMP: 3726 case WLAN_CIPHER_SUITE_CCMP_256: 3727 case WLAN_CIPHER_SUITE_GCMP: 3728 case WLAN_CIPHER_SUITE_GCMP_256: 3729 pn = atomic64_inc_return(&key->conf.tx_pn); 3730 crypto_hdr[0] = pn; 3731 crypto_hdr[1] = pn >> 8; 3732 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3733 crypto_hdr[4] = pn >> 16; 3734 crypto_hdr[5] = pn >> 24; 3735 crypto_hdr[6] = pn >> 32; 3736 crypto_hdr[7] = pn >> 40; 3737 break; 3738 } 3739 } 3740 3741 return TX_CONTINUE; 3742 } 3743 3744 static netdev_features_t 3745 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3746 { 3747 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3748 return sdata->vif.netdev_features; 3749 3750 if (!sdata->bss) 3751 return 0; 3752 3753 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3754 return sdata->vif.netdev_features; 3755 } 3756 3757 static struct sk_buff * 3758 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3759 { 3760 if (skb_is_gso(skb)) { 3761 struct sk_buff *segs; 3762 3763 segs = skb_gso_segment(skb, features); 3764 if (!segs) 3765 return skb; 3766 if (IS_ERR(segs)) 3767 goto free; 3768 3769 consume_skb(skb); 3770 return segs; 3771 } 3772 3773 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3774 goto free; 3775 3776 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3777 int ofs = skb_checksum_start_offset(skb); 3778 3779 if (skb->encapsulation) 3780 skb_set_inner_transport_header(skb, ofs); 3781 else 3782 skb_set_transport_header(skb, ofs); 3783 3784 if (skb_csum_hwoffload_help(skb, features)) 3785 goto free; 3786 } 3787 3788 skb_mark_not_on_list(skb); 3789 return skb; 3790 3791 free: 3792 kfree_skb(skb); 3793 return NULL; 3794 } 3795 3796 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3797 struct sta_info *sta, 3798 struct ieee80211_fast_tx *fast_tx, 3799 struct sk_buff *skb, bool ampdu, 3800 const u8 *da, const u8 *sa) 3801 { 3802 struct ieee80211_local *local = sdata->local; 3803 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3804 struct ieee80211_tx_info *info; 3805 struct ieee80211_tx_data tx; 3806 ieee80211_tx_result r; 3807 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3808 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3809 3810 skb = skb_share_check(skb, GFP_ATOMIC); 3811 if (unlikely(!skb)) 3812 return; 3813 3814 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3815 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3816 return; 3817 3818 /* will not be crypto-handled beyond what we do here, so use false 3819 * as the may-encrypt argument for the resize to not account for 3820 * more room than we already have in 'extra_head' 3821 */ 3822 if (unlikely(ieee80211_skb_resize(sdata, skb, 3823 max_t(int, extra_head + hw_headroom - 3824 skb_headroom(skb), 0), 3825 ENCRYPT_NO))) 3826 goto free; 3827 3828 hdr = skb_push(skb, extra_head); 3829 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3830 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3831 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3832 3833 info = IEEE80211_SKB_CB(skb); 3834 memset(info, 0, sizeof(*info)); 3835 info->band = fast_tx->band; 3836 info->control.vif = &sdata->vif; 3837 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3838 IEEE80211_TX_CTL_DONTFRAG; 3839 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3840 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3841 IEEE80211_TX_CTRL_MLO_LINK); 3842 3843 #ifdef CONFIG_MAC80211_DEBUGFS 3844 if (local->force_tx_status) 3845 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3846 #endif 3847 3848 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3849 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3850 3851 *ieee80211_get_qos_ctl(hdr) = tid; 3852 } 3853 3854 __skb_queue_head_init(&tx.skbs); 3855 3856 tx.flags = IEEE80211_TX_UNICAST; 3857 tx.local = local; 3858 tx.sdata = sdata; 3859 tx.sta = sta; 3860 tx.key = fast_tx->key; 3861 3862 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3863 return; 3864 3865 tx.skb = skb; 3866 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3867 fast_tx->key, &tx); 3868 tx.skb = NULL; 3869 if (r == TX_DROP) { 3870 tx.sdata->tx_handlers_drop++; 3871 goto free; 3872 } 3873 3874 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3875 sdata = container_of(sdata->bss, 3876 struct ieee80211_sub_if_data, u.ap); 3877 3878 __skb_queue_tail(&tx.skbs, skb); 3879 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3880 return; 3881 3882 free: 3883 kfree_skb(skb); 3884 } 3885 3886 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3887 struct sta_info *sta, 3888 struct ieee80211_fast_tx *fast_tx, 3889 struct sk_buff *skb) 3890 { 3891 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3892 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3893 struct tid_ampdu_tx *tid_tx = NULL; 3894 struct sk_buff *next; 3895 struct ethhdr eth; 3896 u8 tid = IEEE80211_NUM_TIDS; 3897 3898 /* control port protocol needs a lot of special handling */ 3899 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3900 return false; 3901 3902 /* only RFC 1042 SNAP */ 3903 if (ethertype < ETH_P_802_3_MIN) 3904 return false; 3905 3906 /* don't handle TX status request here either */ 3907 if (sk_requests_wifi_status(skb->sk)) 3908 return false; 3909 3910 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3911 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3912 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3913 if (tid_tx) { 3914 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3915 return false; 3916 if (tid_tx->timeout) 3917 tid_tx->last_tx = jiffies; 3918 } 3919 } 3920 3921 memcpy(ð, skb->data, ETH_HLEN - 2); 3922 3923 /* after this point (skb is modified) we cannot return false */ 3924 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3925 if (!skb) 3926 return true; 3927 3928 skb_list_walk_safe(skb, skb, next) { 3929 skb_mark_not_on_list(skb); 3930 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3931 eth.h_dest, eth.h_source); 3932 } 3933 3934 return true; 3935 } 3936 3937 static bool ieee80211_drop_unauth_port(struct ieee80211_tx_data *tx) 3938 { 3939 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 3940 struct ieee80211_hdr *hdr; 3941 3942 if (likely(test_sta_flag(tx->sta, WLAN_STA_AUTHORIZED))) 3943 return false; 3944 3945 if (info->flags & IEEE80211_TX_CTL_INJECTED) 3946 return false; 3947 3948 if (ieee80211_vif_is_mesh(&tx->sdata->vif) || 3949 tx->sdata->vif.type == NL80211_IFTYPE_OCB) 3950 return false; 3951 3952 /* no need to check forwarding here */ 3953 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 3954 return !(info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO); 3955 3956 hdr = (struct ieee80211_hdr *)tx->skb->data; 3957 3958 if (!ieee80211_is_data_present(hdr->frame_control) || 3959 is_multicast_ether_addr(hdr->addr1)) 3960 return false; 3961 3962 if ((info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) && 3963 ieee80211_is_our_addr(tx->sdata, hdr->addr2, NULL)) 3964 return false; 3965 3966 return true; 3967 } 3968 3969 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3970 struct ieee80211_txq *txq) 3971 { 3972 struct ieee80211_local *local = hw_to_local(hw); 3973 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3974 struct ieee80211_hdr *hdr; 3975 struct sk_buff *skb = NULL; 3976 struct fq *fq = &local->fq; 3977 struct fq_tin *tin = &txqi->tin; 3978 struct ieee80211_tx_info *info; 3979 struct ieee80211_tx_data tx; 3980 ieee80211_tx_result r; 3981 struct ieee80211_vif *vif = txq->vif; 3982 int q = vif->hw_queue[txq->ac]; 3983 unsigned long flags; 3984 bool q_stopped; 3985 3986 WARN_ON_ONCE(softirq_count() == 0); 3987 3988 if (!ieee80211_txq_airtime_check(hw, txq)) 3989 return NULL; 3990 3991 begin: 3992 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3993 q_stopped = local->queue_stop_reasons[q]; 3994 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3995 3996 if (unlikely(q_stopped)) { 3997 /* mark for waking later */ 3998 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3999 return NULL; 4000 } 4001 4002 spin_lock_bh(&fq->lock); 4003 4004 /* Make sure fragments stay together. */ 4005 skb = __skb_dequeue(&txqi->frags); 4006 if (unlikely(skb)) { 4007 if (!(IEEE80211_SKB_CB(skb)->control.flags & 4008 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 4009 goto out; 4010 IEEE80211_SKB_CB(skb)->control.flags &= 4011 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 4012 } else { 4013 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 4014 goto out; 4015 4016 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 4017 } 4018 4019 if (!skb) 4020 goto out; 4021 4022 spin_unlock_bh(&fq->lock); 4023 4024 hdr = (struct ieee80211_hdr *)skb->data; 4025 info = IEEE80211_SKB_CB(skb); 4026 4027 memset(&tx, 0, sizeof(tx)); 4028 __skb_queue_head_init(&tx.skbs); 4029 tx.local = local; 4030 tx.skb = skb; 4031 tx.sdata = vif_to_sdata(info->control.vif); 4032 4033 if (txq->sta) { 4034 tx.sta = container_of(txq->sta, struct sta_info, sta); 4035 4036 if (unlikely(ieee80211_drop_unauth_port(&tx))) { 4037 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 4038 ieee80211_free_txskb(&local->hw, skb); 4039 goto begin; 4040 } 4041 } 4042 4043 /* 4044 * The key can be removed while the packet was queued, so need to call 4045 * this here to get the current key. 4046 */ 4047 info->control.hw_key = NULL; 4048 r = ieee80211_tx_h_select_key(&tx); 4049 if (r != TX_CONTINUE) { 4050 ieee80211_free_txskb(&local->hw, skb); 4051 goto begin; 4052 } 4053 4054 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 4055 info->flags |= (IEEE80211_TX_CTL_AMPDU | 4056 IEEE80211_TX_CTL_DONTFRAG); 4057 4058 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4059 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 4060 r = ieee80211_tx_h_rate_ctrl(&tx); 4061 if (r != TX_CONTINUE) { 4062 ieee80211_free_txskb(&local->hw, skb); 4063 goto begin; 4064 } 4065 } 4066 goto encap_out; 4067 } 4068 4069 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 4070 struct sta_info *sta = container_of(txq->sta, struct sta_info, 4071 sta); 4072 u8 pn_offs = 0; 4073 4074 if (tx.key && 4075 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 4076 pn_offs = ieee80211_hdrlen(hdr->frame_control); 4077 4078 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 4079 tx.key, &tx); 4080 if (r != TX_CONTINUE) { 4081 ieee80211_free_txskb(&local->hw, skb); 4082 goto begin; 4083 } 4084 } else { 4085 if (invoke_tx_handlers_late(&tx)) 4086 goto begin; 4087 4088 skb = __skb_dequeue(&tx.skbs); 4089 info = IEEE80211_SKB_CB(skb); 4090 4091 if (!skb_queue_empty(&tx.skbs)) { 4092 spin_lock_bh(&fq->lock); 4093 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 4094 spin_unlock_bh(&fq->lock); 4095 } 4096 } 4097 4098 if (skb_has_frag_list(skb) && 4099 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 4100 if (skb_linearize(skb)) { 4101 ieee80211_free_txskb(&local->hw, skb); 4102 goto begin; 4103 } 4104 } 4105 4106 switch (tx.sdata->vif.type) { 4107 case NL80211_IFTYPE_MONITOR: 4108 if ((tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) || 4109 ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) { 4110 vif = &tx.sdata->vif; 4111 break; 4112 } 4113 tx.sdata = rcu_dereference(local->monitor_sdata); 4114 if (tx.sdata && 4115 ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) { 4116 vif = &tx.sdata->vif; 4117 info->hw_queue = 4118 vif->hw_queue[skb_get_queue_mapping(skb)]; 4119 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 4120 ieee80211_free_txskb(&local->hw, skb); 4121 goto begin; 4122 } else { 4123 info->control.vif = NULL; 4124 return skb; 4125 } 4126 break; 4127 case NL80211_IFTYPE_AP_VLAN: 4128 tx.sdata = container_of(tx.sdata->bss, 4129 struct ieee80211_sub_if_data, u.ap); 4130 fallthrough; 4131 default: 4132 vif = &tx.sdata->vif; 4133 break; 4134 } 4135 4136 encap_out: 4137 info->control.vif = vif; 4138 4139 if (wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 4140 bool ampdu = txq->sta && txq->ac != IEEE80211_AC_VO; 4141 u32 airtime; 4142 4143 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 4144 skb->len, ampdu); 4145 if (!airtime) 4146 return skb; 4147 4148 airtime = ieee80211_info_set_tx_time_est(info, airtime); 4149 info->tx_time_mc = !tx.sta; 4150 ieee80211_sta_update_pending_airtime(local, tx.sta, txq->ac, 4151 airtime, false, 4152 info->tx_time_mc); 4153 } 4154 4155 return skb; 4156 4157 out: 4158 spin_unlock_bh(&fq->lock); 4159 4160 return skb; 4161 } 4162 EXPORT_SYMBOL(ieee80211_tx_dequeue); 4163 4164 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 4165 { 4166 struct airtime_info *air_info = &sta->airtime[ac]; 4167 4168 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 4169 } 4170 4171 static void 4172 ieee80211_txq_set_active(struct txq_info *txqi) 4173 { 4174 struct sta_info *sta; 4175 4176 if (!txqi->txq.sta) 4177 return; 4178 4179 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4180 sta->airtime[txqi->txq.ac].last_active = jiffies; 4181 } 4182 4183 static bool 4184 ieee80211_txq_keep_active(struct txq_info *txqi) 4185 { 4186 struct sta_info *sta; 4187 4188 if (!txqi->txq.sta) 4189 return false; 4190 4191 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4192 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4193 return false; 4194 4195 return ieee80211_sta_keep_active(sta, txqi->txq.ac); 4196 } 4197 4198 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4199 { 4200 struct ieee80211_local *local = hw_to_local(hw); 4201 struct ieee80211_txq *ret = NULL; 4202 struct txq_info *txqi = NULL, *head = NULL; 4203 bool found_eligible_txq = false; 4204 bool aql_check; 4205 4206 spin_lock_bh(&local->active_txq_lock[ac]); 4207 4208 if (!local->schedule_open[ac]) 4209 goto out; 4210 4211 begin: 4212 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4213 struct txq_info, 4214 schedule_order); 4215 if (!txqi) 4216 goto out; 4217 4218 if (txqi == head) { 4219 if (!found_eligible_txq) 4220 goto out; 4221 else 4222 found_eligible_txq = false; 4223 } 4224 4225 if (!head) 4226 head = txqi; 4227 4228 aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4229 if (aql_check) 4230 found_eligible_txq = true; 4231 4232 if (txqi->txq.sta) { 4233 struct sta_info *sta = container_of(txqi->txq.sta, 4234 struct sta_info, sta); 4235 4236 if (ieee80211_sta_deficit(sta, txqi->txq.ac) < 0) { 4237 sta->airtime[txqi->txq.ac].deficit += 4238 sta->airtime_weight; 4239 4240 aql_check = false; 4241 } 4242 } 4243 4244 if (!aql_check) { 4245 list_move_tail(&txqi->schedule_order, 4246 &local->active_txqs[txqi->txq.ac]); 4247 goto begin; 4248 } 4249 4250 if (txqi->schedule_round == local->schedule_round[ac]) 4251 goto out; 4252 4253 list_del_init(&txqi->schedule_order); 4254 txqi->schedule_round = local->schedule_round[ac]; 4255 ret = &txqi->txq; 4256 4257 out: 4258 spin_unlock_bh(&local->active_txq_lock[ac]); 4259 return ret; 4260 } 4261 EXPORT_SYMBOL(ieee80211_next_txq); 4262 4263 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4264 struct ieee80211_txq *txq, 4265 bool force) 4266 { 4267 struct ieee80211_local *local = hw_to_local(hw); 4268 struct txq_info *txqi = to_txq_info(txq); 4269 bool has_queue; 4270 4271 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4272 4273 has_queue = force || 4274 (!test_bit(IEEE80211_TXQ_STOP, &txqi->flags) && 4275 txq_has_queue(txq)); 4276 if (list_empty(&txqi->schedule_order) && 4277 (has_queue || ieee80211_txq_keep_active(txqi))) { 4278 /* If airtime accounting is active, always enqueue STAs at the 4279 * head of the list to ensure that they only get moved to the 4280 * back by the airtime DRR scheduler once they have a negative 4281 * deficit. A station that already has a negative deficit will 4282 * get immediately moved to the back of the list on the next 4283 * call to ieee80211_next_txq(). 4284 */ 4285 if (txqi->txq.sta && local->airtime_flags && has_queue && 4286 wiphy_ext_feature_isset(local->hw.wiphy, 4287 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4288 list_add(&txqi->schedule_order, 4289 &local->active_txqs[txq->ac]); 4290 else 4291 list_add_tail(&txqi->schedule_order, 4292 &local->active_txqs[txq->ac]); 4293 if (has_queue) 4294 ieee80211_txq_set_active(txqi); 4295 } 4296 4297 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4298 } 4299 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4300 4301 DEFINE_STATIC_KEY_FALSE(aql_disable); 4302 4303 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4304 struct ieee80211_txq *txq) 4305 { 4306 struct sta_info *sta; 4307 struct ieee80211_local *local = hw_to_local(hw); 4308 4309 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4310 return true; 4311 4312 if (static_branch_unlikely(&aql_disable)) 4313 return true; 4314 4315 if (!txq->sta) 4316 return atomic_read(&local->aql_mc_pending_airtime) < 4317 local->aql_txq_limit_mc; 4318 4319 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4320 return true; 4321 4322 sta = container_of(txq->sta, struct sta_info, sta); 4323 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4324 sta->airtime[txq->ac].aql_limit_low) 4325 return true; 4326 4327 if (atomic_read(&local->aql_total_pending_airtime) < 4328 local->aql_threshold && 4329 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4330 sta->airtime[txq->ac].aql_limit_high) 4331 return true; 4332 4333 return false; 4334 } 4335 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4336 4337 u32 ieee80211_txq_aql_pending(struct ieee80211_hw *hw, 4338 struct ieee80211_txq *txq) 4339 { 4340 struct ieee80211_local *local = hw_to_local(hw); 4341 struct sta_info *sta; 4342 4343 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4344 return 0; 4345 4346 if (!txq->sta) 4347 return atomic_read(&local->aql_mc_pending_airtime); 4348 4349 sta = container_of(txq->sta, struct sta_info, sta); 4350 4351 return atomic_read(&sta->airtime[txq->ac].aql_tx_pending); 4352 } 4353 EXPORT_SYMBOL(ieee80211_txq_aql_pending); 4354 4355 static bool 4356 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4357 { 4358 unsigned int num_txq = 0; 4359 struct txq_info *txq; 4360 u32 aql_limit; 4361 4362 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4363 return true; 4364 4365 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4366 num_txq++; 4367 4368 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4369 local->aql_txq_limit_high[ac]; 4370 4371 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4372 } 4373 4374 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4375 struct ieee80211_txq *txq) 4376 { 4377 struct ieee80211_local *local = hw_to_local(hw); 4378 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4379 struct sta_info *sta; 4380 u8 ac = txq->ac; 4381 4382 spin_lock_bh(&local->active_txq_lock[ac]); 4383 4384 if (list_empty(&txqi->schedule_order)) 4385 goto out; 4386 4387 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4388 goto out; 4389 4390 if (!txqi->txq.sta) 4391 goto out; 4392 4393 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4394 schedule_order) { 4395 if (iter == txqi) 4396 break; 4397 4398 if (!iter->txq.sta) { 4399 list_move_tail(&iter->schedule_order, 4400 &local->active_txqs[ac]); 4401 continue; 4402 } 4403 sta = container_of(iter->txq.sta, struct sta_info, sta); 4404 if (ieee80211_sta_deficit(sta, ac) < 0) 4405 sta->airtime[ac].deficit += sta->airtime_weight; 4406 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4407 } 4408 4409 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4410 if (sta->airtime[ac].deficit >= 0) 4411 goto out; 4412 4413 sta->airtime[ac].deficit += sta->airtime_weight; 4414 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4415 spin_unlock_bh(&local->active_txq_lock[ac]); 4416 4417 return false; 4418 out: 4419 if (!list_empty(&txqi->schedule_order)) 4420 list_del_init(&txqi->schedule_order); 4421 spin_unlock_bh(&local->active_txq_lock[ac]); 4422 4423 return true; 4424 } 4425 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4426 4427 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4428 { 4429 struct ieee80211_local *local = hw_to_local(hw); 4430 4431 spin_lock_bh(&local->active_txq_lock[ac]); 4432 4433 local->schedule_open[ac] = 4434 ieee80211_txq_schedule_airtime_check(local, ac); 4435 if (local->schedule_open[ac]) { 4436 local->schedule_round[ac]++; 4437 if (!local->schedule_round[ac]) 4438 local->schedule_round[ac]++; 4439 } 4440 4441 spin_unlock_bh(&local->active_txq_lock[ac]); 4442 } 4443 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4444 4445 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4446 struct net_device *dev, 4447 u32 info_flags, 4448 u32 ctrl_flags) 4449 { 4450 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4451 struct ieee80211_local *local = sdata->local; 4452 struct ieee80211_tx_info *info; 4453 struct sta_info *sta; 4454 struct sk_buff *next; 4455 bool group_addressed; 4456 int len = skb->len; 4457 4458 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4459 kfree_skb(skb); 4460 return; 4461 } 4462 4463 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4464 4465 rcu_read_lock(); 4466 4467 if (ieee80211_vif_is_mesh(&sdata->vif) && 4468 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4469 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4470 goto out; 4471 4472 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, 4473 skb->protocol == sdata->control_port_protocol)) 4474 goto out_free; 4475 4476 group_addressed = IS_ERR(sta); 4477 if (IS_ERR(sta)) 4478 sta = NULL; 4479 4480 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4481 ieee80211_aggr_check(sdata, sta, skb); 4482 4483 if (sta) { 4484 struct ieee80211_fast_tx *fast_tx; 4485 4486 fast_tx = rcu_dereference(sta->fast_tx); 4487 4488 if (fast_tx && 4489 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4490 goto out; 4491 } 4492 4493 /* the frame could be fragmented, software-encrypted, and other 4494 * things so we cannot really handle checksum or GSO offload. 4495 * fix it up in software before we handle anything else. 4496 */ 4497 skb = ieee80211_tx_skb_fixup(skb, 0); 4498 if (!skb) { 4499 len = 0; 4500 goto out; 4501 } 4502 4503 skb_list_walk_safe(skb, skb, next) { 4504 skb_mark_not_on_list(skb); 4505 4506 if (skb->protocol == sdata->control_port_protocol) 4507 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4508 4509 skb = skb_share_check(skb, GFP_ATOMIC); 4510 if (unlikely(!skb)) { 4511 kfree_skb_list(next); 4512 goto out; 4513 } 4514 4515 info = IEEE80211_SKB_CB(skb); 4516 memset(info, 0, sizeof(*info)); 4517 info->flags = info_flags; 4518 info->control.flags = ctrl_flags; 4519 4520 if (unlikely(!group_addressed && 4521 sk_requests_wifi_status(skb->sk))) 4522 ieee80211_store_ack_skb(local, skb, 0); 4523 4524 skb = ieee80211_build_hdr(sdata, skb, sta); 4525 if (IS_ERR(skb)) { 4526 kfree_skb_list(next); 4527 goto out; 4528 } 4529 4530 dev_sw_netstats_tx_add(dev, 1, skb->len); 4531 4532 ieee80211_xmit(sdata, sta, skb); 4533 } 4534 goto out; 4535 out_free: 4536 kfree_skb(skb); 4537 len = 0; 4538 out: 4539 if (len) 4540 ieee80211_tpt_led_trig_tx(local, len); 4541 rcu_read_unlock(); 4542 } 4543 4544 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4545 { 4546 struct ethhdr *eth; 4547 int err; 4548 4549 err = skb_ensure_writable(skb, ETH_HLEN); 4550 if (unlikely(err)) 4551 return err; 4552 4553 eth = (void *)skb->data; 4554 ether_addr_copy(eth->h_dest, sta->sta.addr); 4555 4556 return 0; 4557 } 4558 4559 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4560 struct net_device *dev) 4561 { 4562 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4563 const struct ethhdr *eth = (void *)skb->data; 4564 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4565 __be16 ethertype; 4566 4567 switch (sdata->vif.type) { 4568 case NL80211_IFTYPE_AP_VLAN: 4569 if (sdata->u.vlan.sta) 4570 return false; 4571 if (sdata->wdev.use_4addr) 4572 return false; 4573 fallthrough; 4574 case NL80211_IFTYPE_AP: 4575 /* check runtime toggle for this bss */ 4576 if (!sdata->bss->multicast_to_unicast) 4577 return false; 4578 break; 4579 default: 4580 return false; 4581 } 4582 4583 /* multicast to unicast conversion only for some payload */ 4584 ethertype = eth->h_proto; 4585 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4586 ethertype = ethvlan->h_vlan_encapsulated_proto; 4587 switch (ethertype) { 4588 case htons(ETH_P_ARP): 4589 case htons(ETH_P_IP): 4590 case htons(ETH_P_IPV6): 4591 break; 4592 default: 4593 return false; 4594 } 4595 4596 return true; 4597 } 4598 4599 static void 4600 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4601 struct sk_buff_head *queue) 4602 { 4603 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4604 struct ieee80211_local *local = sdata->local; 4605 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4606 struct sta_info *sta, *first = NULL; 4607 struct sk_buff *cloned_skb; 4608 4609 rcu_read_lock(); 4610 4611 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4612 if (sdata != sta->sdata) 4613 /* AP-VLAN mismatch */ 4614 continue; 4615 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4616 /* do not send back to source */ 4617 continue; 4618 if (!first) { 4619 first = sta; 4620 continue; 4621 } 4622 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4623 if (!cloned_skb) 4624 goto multicast; 4625 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4626 dev_kfree_skb(cloned_skb); 4627 goto multicast; 4628 } 4629 __skb_queue_tail(queue, cloned_skb); 4630 } 4631 4632 if (likely(first)) { 4633 if (unlikely(ieee80211_change_da(skb, first))) 4634 goto multicast; 4635 __skb_queue_tail(queue, skb); 4636 } else { 4637 /* no STA connected, drop */ 4638 kfree_skb(skb); 4639 skb = NULL; 4640 } 4641 4642 goto out; 4643 multicast: 4644 __skb_queue_purge(queue); 4645 __skb_queue_tail(queue, skb); 4646 out: 4647 rcu_read_unlock(); 4648 } 4649 4650 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4651 struct sk_buff *skb, u32 ctrl_flags, 4652 unsigned int link_id) 4653 { 4654 struct sk_buff *out; 4655 4656 out = skb_copy(skb, GFP_ATOMIC); 4657 if (!out) 4658 return; 4659 4660 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4661 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags); 4662 } 4663 4664 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4665 struct sk_buff *skb) 4666 { 4667 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4668 unsigned long links = sdata->vif.active_links; 4669 unsigned int link; 4670 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4671 4672 if (hweight16(links) == 1) { 4673 ctrl_flags |= u32_encode_bits(__ffs(links), 4674 IEEE80211_TX_CTRL_MLO_LINK); 4675 4676 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags); 4677 return; 4678 } 4679 4680 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4681 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4682 ctrl_flags = 0; 4683 } 4684 kfree_skb(skb); 4685 } 4686 4687 /** 4688 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4689 * @skb: packet to be sent 4690 * @dev: incoming interface 4691 * 4692 * On failure skb will be freed. 4693 * 4694 * Returns: the netdev TX status (but really only %NETDEV_TX_OK) 4695 */ 4696 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4697 struct net_device *dev) 4698 { 4699 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4700 const struct ethhdr *eth = (void *)skb->data; 4701 4702 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4703 goto normal; 4704 4705 if (unlikely(!ieee80211_sdata_running(sdata))) { 4706 kfree_skb(skb); 4707 return NETDEV_TX_OK; 4708 } 4709 4710 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4711 struct sk_buff_head queue; 4712 4713 __skb_queue_head_init(&queue); 4714 ieee80211_convert_to_unicast(skb, dev, &queue); 4715 while ((skb = __skb_dequeue(&queue))) 4716 __ieee80211_subif_start_xmit(skb, dev, 0, 4717 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC); 4718 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4719 ((sdata->vif.type == NL80211_IFTYPE_AP && 4720 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) || 4721 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4722 !sdata->wdev.use_4addr))) { 4723 ieee80211_mlo_multicast_tx(dev, skb); 4724 } else { 4725 normal: 4726 __ieee80211_subif_start_xmit(skb, dev, 0, 4727 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC); 4728 } 4729 4730 return NETDEV_TX_OK; 4731 } 4732 4733 4734 4735 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4736 struct sk_buff *skb, struct sta_info *sta, 4737 bool txpending) 4738 { 4739 struct ieee80211_local *local = sdata->local; 4740 struct ieee80211_tx_control control = {}; 4741 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4742 struct ieee80211_sta *pubsta = NULL; 4743 unsigned long flags; 4744 int q = info->hw_queue; 4745 4746 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4747 4748 if (local->queue_stop_reasons[q] || 4749 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4750 if (txpending) 4751 skb_queue_head(&local->pending[q], skb); 4752 else 4753 skb_queue_tail(&local->pending[q], skb); 4754 4755 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4756 4757 return false; 4758 } 4759 4760 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4761 4762 if (sta && sta->uploaded) 4763 pubsta = &sta->sta; 4764 4765 control.sta = pubsta; 4766 4767 drv_tx(local, &control, skb); 4768 4769 return true; 4770 } 4771 4772 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4773 struct sk_buff *skb, struct sta_info *sta, 4774 bool txpending) 4775 { 4776 struct ieee80211_local *local = sdata->local; 4777 struct sk_buff *next; 4778 bool ret = true; 4779 4780 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4781 return true; 4782 4783 skb_list_walk_safe(skb, skb, next) { 4784 skb_mark_not_on_list(skb); 4785 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4786 ret = false; 4787 } 4788 4789 return ret; 4790 } 4791 4792 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4793 struct net_device *dev, struct sta_info *sta, 4794 struct ieee80211_key *key, struct sk_buff *skb) 4795 { 4796 struct ieee80211_tx_info *info; 4797 struct ieee80211_local *local = sdata->local; 4798 struct ieee80211_chanctx_conf *chanctx_conf; 4799 struct tid_ampdu_tx *tid_tx = NULL; 4800 struct sk_buff *seg, *next; 4801 unsigned int skbs = 0, len = 0; 4802 u16 queue; 4803 u8 tid; 4804 4805 queue = ieee80211_select_queue(sdata, sta, skb); 4806 skb_set_queue_mapping(skb, queue); 4807 4808 skb = skb_share_check(skb, GFP_ATOMIC); 4809 if (unlikely(!skb)) 4810 return; 4811 4812 ieee80211_aggr_check(sdata, sta, skb); 4813 4814 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4815 4816 if (sta) 4817 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4818 if (tid_tx) { 4819 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4820 /* fall back to non-offload slow path */ 4821 __ieee80211_subif_start_xmit(skb, dev, 0, 4822 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC); 4823 return; 4824 } 4825 4826 if (tid_tx->timeout) 4827 tid_tx->last_tx = jiffies; 4828 } 4829 4830 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4831 if (!skb) 4832 return; 4833 4834 info = IEEE80211_SKB_CB(skb); 4835 memset(info, 0, sizeof(*info)); 4836 4837 info->hw_queue = sdata->vif.hw_queue[queue]; 4838 4839 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4840 sdata = container_of(sdata->bss, 4841 struct ieee80211_sub_if_data, u.ap); 4842 4843 /* MLD transmissions must not rely on the band */ 4844 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4845 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4846 if (unlikely(!chanctx_conf)) { 4847 kfree_skb_list(skb); 4848 return; 4849 } 4850 info->band = chanctx_conf->def.chan->band; 4851 } 4852 4853 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4854 info->control.vif = &sdata->vif; 4855 4856 if (key) 4857 info->control.hw_key = &key->conf; 4858 4859 skb_list_walk_safe(skb, seg, next) { 4860 skbs++; 4861 len += seg->len; 4862 if (seg != skb) 4863 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4864 } 4865 4866 if (unlikely(sk_requests_wifi_status(skb->sk))) 4867 ieee80211_store_ack_skb(local, skb, 0); 4868 4869 dev_sw_netstats_tx_add(dev, skbs, len); 4870 4871 if (sta) { 4872 sta->deflink.tx_stats.packets[queue] += skbs; 4873 sta->deflink.tx_stats.bytes[queue] += len; 4874 } 4875 4876 ieee80211_tpt_led_trig_tx(local, len); 4877 4878 ieee80211_tx_8023(sdata, skb, sta, false); 4879 } 4880 4881 static bool ieee80211_check_mcast_offload(struct ieee80211_sub_if_data *sdata, 4882 struct sk_buff *skb) 4883 { 4884 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4885 4886 if ((ieee80211_vif_is_mld(&sdata->vif) && 4887 (sdata->vif.type == NL80211_IFTYPE_AP && 4888 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX))) || 4889 (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && 4890 !sdata->wdev.use_4addr)) 4891 return false; 4892 4893 if (!is_multicast_ether_addr(skb->data) || 4894 !(sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_MCAST) || 4895 sdata->control_port_protocol == ehdr->h_proto) 4896 return false; 4897 4898 return true; 4899 } 4900 4901 static void __ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4902 struct net_device *dev) 4903 { 4904 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4905 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4906 struct ieee80211_link_data *link; 4907 struct ieee80211_key *key; 4908 struct sta_info *sta; 4909 4910 rcu_read_lock(); 4911 4912 if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) 4913 goto skip_offload; 4914 4915 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, false)) { 4916 kfree_skb(skb); 4917 goto out; 4918 } 4919 4920 /* 4921 * If STA is invalid, use the multicast offload path when applicable. 4922 * In AP mode, drop the frame if there are no associated stations; 4923 * otherwise use the default link and multicast key for transmission. 4924 */ 4925 if (unlikely(IS_ERR_OR_NULL(sta) && 4926 ieee80211_check_mcast_offload(sdata, skb))) { 4927 sta = NULL; 4928 if (ieee80211_vif_get_num_mcast_if(sdata) <= 0) { 4929 /* No associated STAs - no need to send multicast frames. */ 4930 kfree_skb(skb); 4931 goto out; 4932 } 4933 link = &sdata->deflink; 4934 key = rcu_dereference(link->default_multicast_key); 4935 } else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4936 !test_sta_flag(sta, WLAN_STA_AUTHORIZED))) { 4937 goto skip_offload; 4938 } else { 4939 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4940 if (!key) 4941 key = rcu_dereference(sdata->default_unicast_key); 4942 } 4943 4944 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4945 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4946 goto skip_offload; 4947 4948 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4949 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4950 goto out; 4951 4952 skip_offload: 4953 ieee80211_subif_start_xmit(skb, dev); 4954 out: 4955 rcu_read_unlock(); 4956 } 4957 4958 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4959 struct net_device *dev) 4960 { 4961 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4962 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4963 4964 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4965 kfree_skb(skb); 4966 return NETDEV_TX_OK; 4967 } 4968 4969 if (unlikely(is_multicast_ether_addr(ehdr->h_dest) && 4970 ieee80211_multicast_to_unicast(skb, dev))) { 4971 struct sk_buff_head queue; 4972 4973 __skb_queue_head_init(&queue); 4974 ieee80211_convert_to_unicast(skb, dev, &queue); 4975 while ((skb = __skb_dequeue(&queue))) 4976 __ieee80211_subif_start_xmit_8023(skb, dev); 4977 } else { 4978 __ieee80211_subif_start_xmit_8023(skb, dev); 4979 } 4980 4981 return NETDEV_TX_OK; 4982 } 4983 4984 struct sk_buff * 4985 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4986 struct sk_buff *skb, u32 info_flags) 4987 { 4988 struct ieee80211_hdr *hdr; 4989 struct ieee80211_tx_data tx = { 4990 .local = sdata->local, 4991 .sdata = sdata, 4992 }; 4993 struct ieee80211_tx_info *info; 4994 struct sta_info *sta; 4995 4996 rcu_read_lock(); 4997 4998 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, false)) { 4999 kfree_skb(skb); 5000 skb = ERR_PTR(-EINVAL); 5001 goto out; 5002 } 5003 5004 info = IEEE80211_SKB_CB(skb); 5005 memset(info, 0, sizeof(*info)); 5006 info->flags = info_flags; 5007 info->control.flags = IEEE80211_TX_CTRL_MLO_LINK_UNSPEC; 5008 5009 skb = ieee80211_build_hdr(sdata, skb, sta); 5010 if (IS_ERR(skb)) 5011 goto out; 5012 5013 hdr = (void *)skb->data; 5014 tx.sta = sta_info_get(sdata, hdr->addr1); 5015 tx.skb = skb; 5016 5017 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 5018 rcu_read_unlock(); 5019 kfree_skb(skb); 5020 return ERR_PTR(-EINVAL); 5021 } 5022 5023 out: 5024 rcu_read_unlock(); 5025 return skb; 5026 } 5027 5028 /* 5029 * ieee80211_clear_tx_pending may not be called in a context where 5030 * it is possible that it packets could come in again. 5031 */ 5032 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 5033 { 5034 struct sk_buff *skb; 5035 int i; 5036 5037 for (i = 0; i < local->hw.queues; i++) { 5038 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 5039 ieee80211_free_txskb(&local->hw, skb); 5040 } 5041 } 5042 5043 /* 5044 * Returns false if the frame couldn't be transmitted but was queued instead, 5045 * which in this case means re-queued -- take as an indication to stop sending 5046 * more pending frames. 5047 */ 5048 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 5049 struct sk_buff *skb) 5050 { 5051 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5052 struct ieee80211_sub_if_data *sdata; 5053 struct sta_info *sta; 5054 struct ieee80211_hdr *hdr; 5055 bool result; 5056 struct ieee80211_chanctx_conf *chanctx_conf; 5057 5058 sdata = vif_to_sdata(info->control.vif); 5059 5060 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 5061 /* update band only for non-MLD */ 5062 if (!ieee80211_vif_is_mld(&sdata->vif)) { 5063 chanctx_conf = 5064 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5065 if (unlikely(!chanctx_conf)) { 5066 dev_kfree_skb(skb); 5067 return true; 5068 } 5069 info->band = chanctx_conf->def.chan->band; 5070 } 5071 result = ieee80211_tx(sdata, NULL, skb, true); 5072 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 5073 if (ieee80211_lookup_ra_sta(sdata, skb, &sta, true)) { 5074 dev_kfree_skb(skb); 5075 return true; 5076 } 5077 5078 if (IS_ERR(sta) || (sta && !sta->uploaded)) 5079 sta = NULL; 5080 5081 result = ieee80211_tx_8023(sdata, skb, sta, true); 5082 } else { 5083 struct sk_buff_head skbs; 5084 5085 __skb_queue_head_init(&skbs); 5086 __skb_queue_tail(&skbs, skb); 5087 5088 hdr = (struct ieee80211_hdr *)skb->data; 5089 sta = sta_info_get(sdata, hdr->addr1); 5090 5091 result = __ieee80211_tx(local, &skbs, sta, true); 5092 } 5093 5094 return result; 5095 } 5096 5097 /* 5098 * Transmit all pending packets. Called from tasklet. 5099 */ 5100 void ieee80211_tx_pending(struct tasklet_struct *t) 5101 { 5102 struct ieee80211_local *local = from_tasklet(local, t, 5103 tx_pending_tasklet); 5104 unsigned long flags; 5105 int i; 5106 bool txok; 5107 5108 rcu_read_lock(); 5109 5110 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 5111 for (i = 0; i < local->hw.queues; i++) { 5112 /* 5113 * If queue is stopped by something other than due to pending 5114 * frames, or we have no pending frames, proceed to next queue. 5115 */ 5116 if (local->queue_stop_reasons[i] || 5117 skb_queue_empty(&local->pending[i])) 5118 continue; 5119 5120 while (!skb_queue_empty(&local->pending[i])) { 5121 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 5122 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5123 5124 if (WARN_ON(!info->control.vif)) { 5125 ieee80211_free_txskb(&local->hw, skb); 5126 continue; 5127 } 5128 5129 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 5130 flags); 5131 5132 txok = ieee80211_tx_pending_skb(local, skb); 5133 spin_lock_irqsave(&local->queue_stop_reason_lock, 5134 flags); 5135 if (!txok) 5136 break; 5137 } 5138 } 5139 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 5140 5141 rcu_read_unlock(); 5142 } 5143 5144 /* functions for drivers to get certain frames */ 5145 5146 static void ieee80211_beacon_add_tim_pvb(struct ps_data *ps, 5147 struct sk_buff *skb, 5148 bool mcast_traffic) 5149 { 5150 int i, n1 = 0, n2; 5151 5152 /* 5153 * Find largest even number N1 so that bits numbered 1 through 5154 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 5155 * (N2 + 1) x 8 through 2007 are 0. 5156 */ 5157 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 5158 if (ps->tim[i]) { 5159 n1 = i & 0xfe; 5160 break; 5161 } 5162 } 5163 n2 = n1; 5164 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 5165 if (ps->tim[i]) { 5166 n2 = i; 5167 break; 5168 } 5169 } 5170 5171 /* Bitmap control */ 5172 skb_put_u8(skb, n1 | mcast_traffic); 5173 /* Part Virt Bitmap */ 5174 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 5175 } 5176 5177 /* 5178 * mac80211 currently supports encoding using block bitmap mode, non 5179 * inversed. The current implementation supports up to 1600 AIDs. 5180 * 5181 * Block bitmap encoding breaks down the AID bitmap into blocks of 64 5182 * AIDs. Each block contains between 0 and 8 subblocks. Each subblock 5183 * describes 8 AIDs and the presence of a subblock is determined by 5184 * the block bitmap. 5185 */ 5186 static void ieee80211_s1g_beacon_add_tim_pvb(struct ps_data *ps, 5187 struct sk_buff *skb, 5188 bool mcast_traffic, 5189 bool ucast_traffic) 5190 { 5191 int blk; 5192 5193 /* 5194 * if no unicast and multicast traffic don't emit a bitmap control 5195 * or pvb 5196 */ 5197 if (!mcast_traffic && !ucast_traffic) 5198 return; 5199 5200 /* 5201 * Emit a bitmap control block with a page slice number of 31 and a 5202 * page index of 0 which indicates as per IEEE80211-2024 9.4.2.5.1 5203 * that the entire page (2048 bits) indicated by the page index 5204 * is encoded in the partial virtual bitmap. 5205 */ 5206 skb_put_u8(skb, mcast_traffic | (31 << 1)); 5207 5208 /* If there's no unicast traffic we don't need to include a PVB. */ 5209 if (!ucast_traffic) 5210 return; 5211 5212 /* Emit an encoded block for each non-zero sub-block */ 5213 for (blk = 0; blk < IEEE80211_MAX_SUPPORTED_S1G_TIM_BLOCKS; blk++) { 5214 u8 blk_bmap = 0; 5215 int sblk; 5216 5217 for (sblk = 0; sblk < 8; sblk++) { 5218 int sblk_idx = blk * 8 + sblk; 5219 5220 /* 5221 * If the current subblock is non-zero, increase the 5222 * number of subblocks to emit for the current block. 5223 */ 5224 if (ps->tim[sblk_idx]) 5225 blk_bmap |= BIT(sblk); 5226 } 5227 5228 /* If the current block contains no non-zero sublocks */ 5229 if (!blk_bmap) 5230 continue; 5231 5232 /* 5233 * Emit a block control byte for the current encoded block 5234 * with an encoding mode of block bitmap (0x0), not inverse 5235 * (0x0) and the current block offset (5 bits) 5236 */ 5237 skb_put_u8(skb, blk << 3); 5238 5239 /* 5240 * Emit the block bitmap for the current encoded block which 5241 * contains the present subblocks. 5242 */ 5243 skb_put_u8(skb, blk_bmap); 5244 5245 /* Emit the present subblocks */ 5246 for (sblk = 0; sblk < 8; sblk++) { 5247 int sblk_idx = blk * 8 + sblk; 5248 5249 if (!(blk_bmap & BIT(sblk))) 5250 continue; 5251 5252 skb_put_u8(skb, ps->tim[sblk_idx]); 5253 } 5254 } 5255 } 5256 5257 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5258 struct ieee80211_link_data *link, 5259 struct ps_data *ps, struct sk_buff *skb, 5260 bool is_template) 5261 { 5262 struct element *tim; 5263 bool mcast_traffic = false, have_bits = false; 5264 struct ieee80211_bss_conf *link_conf = link->conf; 5265 bool s1g = ieee80211_get_link_sband(link)->band == NL80211_BAND_S1GHZ; 5266 5267 /* Generate bitmap for TIM only if there are any STAs in power save 5268 * mode. */ 5269 if (atomic_read(&ps->num_sta_ps) > 0) 5270 /* in the hope that this is faster than 5271 * checking byte-for-byte */ 5272 have_bits = !bitmap_empty((unsigned long *)ps->tim, 5273 IEEE80211_MAX_AID + 1); 5274 5275 if (!is_template) { 5276 if (ps->dtim_count == 0) 5277 ps->dtim_count = link_conf->dtim_period - 1; 5278 else 5279 ps->dtim_count--; 5280 } 5281 5282 /* Length is set after parsing the AID bitmap */ 5283 tim = skb_put(skb, sizeof(struct element)); 5284 tim->id = WLAN_EID_TIM; 5285 skb_put_u8(skb, ps->dtim_count); 5286 skb_put_u8(skb, link_conf->dtim_period); 5287 5288 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 5289 mcast_traffic = true; 5290 5291 ps->dtim_bc_mc = mcast_traffic; 5292 5293 if (s1g) { 5294 ieee80211_s1g_beacon_add_tim_pvb(ps, skb, mcast_traffic, 5295 have_bits); 5296 } else if (have_bits) { 5297 ieee80211_beacon_add_tim_pvb(ps, skb, mcast_traffic); 5298 } else { 5299 /* Bitmap control */ 5300 skb_put_u8(skb, mcast_traffic); 5301 /* Part Virt Bitmap */ 5302 skb_put_u8(skb, 0); 5303 } 5304 5305 tim->datalen = skb_tail_pointer(skb) - tim->data; 5306 } 5307 5308 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 5309 struct ieee80211_link_data *link, 5310 struct ps_data *ps, struct sk_buff *skb, 5311 bool is_template) 5312 { 5313 struct ieee80211_local *local = sdata->local; 5314 5315 /* 5316 * Not very nice, but we want to allow the driver to call 5317 * ieee80211_beacon_get() as a response to the set_tim() 5318 * callback. That, however, is already invoked under the 5319 * sta_lock to guarantee consistent and race-free update 5320 * of the tim bitmap in mac80211 and the driver. 5321 */ 5322 if (local->tim_in_locked_section) { 5323 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5324 } else { 5325 spin_lock_bh(&local->tim_lock); 5326 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 5327 spin_unlock_bh(&local->tim_lock); 5328 } 5329 5330 return 0; 5331 } 5332 5333 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 5334 struct beacon_data *beacon, 5335 struct ieee80211_link_data *link) 5336 { 5337 u8 *beacon_data, count, max_count = 1; 5338 struct probe_resp *resp; 5339 size_t beacon_data_len; 5340 u16 *bcn_offsets; 5341 int i; 5342 5343 switch (sdata->vif.type) { 5344 case NL80211_IFTYPE_AP: 5345 beacon_data = beacon->tail; 5346 beacon_data_len = beacon->tail_len; 5347 break; 5348 case NL80211_IFTYPE_ADHOC: 5349 beacon_data = beacon->head; 5350 beacon_data_len = beacon->head_len; 5351 break; 5352 case NL80211_IFTYPE_MESH_POINT: 5353 beacon_data = beacon->head; 5354 beacon_data_len = beacon->head_len; 5355 break; 5356 default: 5357 return; 5358 } 5359 5360 resp = rcu_dereference(link->u.ap.probe_resp); 5361 5362 bcn_offsets = beacon->cntdwn_counter_offsets; 5363 count = beacon->cntdwn_current_counter; 5364 if (link->conf->csa_active) 5365 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 5366 5367 for (i = 0; i < max_count; ++i) { 5368 if (bcn_offsets[i]) { 5369 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5370 return; 5371 beacon_data[bcn_offsets[i]] = count; 5372 } 5373 5374 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5375 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5376 5377 if (resp_offsets[i]) 5378 resp->data[resp_offsets[i]] = count; 5379 } 5380 } 5381 } 5382 5383 static u8 __ieee80211_beacon_update_cntdwn(struct ieee80211_link_data *link, 5384 struct beacon_data *beacon) 5385 { 5386 if (beacon->cntdwn_current_counter == 1) { 5387 /* 5388 * Channel switch handling is done by a worker thread while 5389 * beacons get pulled from hardware timers. It's therefore 5390 * possible that software threads are slow enough to not be 5391 * able to complete CSA handling in a single beacon interval, 5392 * in which case we get here. There isn't much to do about 5393 * it, other than letting the user know that the AP isn't 5394 * behaving correctly. 5395 */ 5396 link_err_once(link, 5397 "beacon TX faster than countdown (channel/color switch) completion\n"); 5398 return 0; 5399 } 5400 5401 beacon->cntdwn_current_counter--; 5402 5403 return beacon->cntdwn_current_counter; 5404 } 5405 5406 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif, unsigned int link_id) 5407 { 5408 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5409 struct ieee80211_link_data *link; 5410 struct beacon_data *beacon = NULL; 5411 u8 count = 0; 5412 5413 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5414 return 0; 5415 5416 rcu_read_lock(); 5417 5418 link = rcu_dereference(sdata->link[link_id]); 5419 if (!link) 5420 goto unlock; 5421 5422 if (sdata->vif.type == NL80211_IFTYPE_AP) 5423 beacon = rcu_dereference(link->u.ap.beacon); 5424 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5425 beacon = rcu_dereference(sdata->u.ibss.presp); 5426 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5427 beacon = rcu_dereference(sdata->u.mesh.beacon); 5428 5429 if (!beacon) 5430 goto unlock; 5431 5432 count = __ieee80211_beacon_update_cntdwn(link, beacon); 5433 5434 unlock: 5435 rcu_read_unlock(); 5436 return count; 5437 } 5438 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5439 5440 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5441 { 5442 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5443 struct beacon_data *beacon = NULL; 5444 5445 rcu_read_lock(); 5446 5447 if (sdata->vif.type == NL80211_IFTYPE_AP) 5448 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5449 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5450 beacon = rcu_dereference(sdata->u.ibss.presp); 5451 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5452 beacon = rcu_dereference(sdata->u.mesh.beacon); 5453 5454 if (!beacon) 5455 goto unlock; 5456 5457 if (counter < beacon->cntdwn_current_counter) 5458 beacon->cntdwn_current_counter = counter; 5459 5460 unlock: 5461 rcu_read_unlock(); 5462 } 5463 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5464 5465 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif, 5466 unsigned int link_id) 5467 { 5468 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5469 struct ieee80211_link_data *link; 5470 struct beacon_data *beacon = NULL; 5471 u8 *beacon_data; 5472 size_t beacon_data_len; 5473 int ret = false; 5474 5475 if (!ieee80211_sdata_running(sdata)) 5476 return false; 5477 5478 if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS)) 5479 return 0; 5480 5481 rcu_read_lock(); 5482 5483 link = rcu_dereference(sdata->link[link_id]); 5484 if (!link) 5485 goto out; 5486 5487 if (vif->type == NL80211_IFTYPE_AP) { 5488 beacon = rcu_dereference(link->u.ap.beacon); 5489 if (WARN_ON(!beacon || !beacon->tail)) 5490 goto out; 5491 beacon_data = beacon->tail; 5492 beacon_data_len = beacon->tail_len; 5493 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5494 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5495 5496 beacon = rcu_dereference(ifibss->presp); 5497 if (!beacon) 5498 goto out; 5499 5500 beacon_data = beacon->head; 5501 beacon_data_len = beacon->head_len; 5502 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5503 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5504 5505 beacon = rcu_dereference(ifmsh->beacon); 5506 if (!beacon) 5507 goto out; 5508 5509 beacon_data = beacon->head; 5510 beacon_data_len = beacon->head_len; 5511 } else { 5512 WARN_ON(1); 5513 goto out; 5514 } 5515 5516 if (!beacon->cntdwn_counter_offsets[0]) 5517 goto out; 5518 5519 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5520 goto out; 5521 5522 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5523 ret = true; 5524 5525 out: 5526 rcu_read_unlock(); 5527 5528 return ret; 5529 } 5530 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5531 5532 static int ieee80211_beacon_protect(struct sk_buff *skb, 5533 struct ieee80211_local *local, 5534 struct ieee80211_sub_if_data *sdata, 5535 struct ieee80211_link_data *link) 5536 { 5537 ieee80211_tx_result res; 5538 struct ieee80211_tx_data tx; 5539 struct sk_buff *check_skb; 5540 5541 memset(&tx, 0, sizeof(tx)); 5542 tx.key = rcu_dereference(link->default_beacon_key); 5543 if (!tx.key) 5544 return 0; 5545 5546 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5547 tx.key = NULL; 5548 return -EINVAL; 5549 } 5550 5551 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5552 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5553 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5554 5555 tx.local = local; 5556 tx.sdata = sdata; 5557 __skb_queue_head_init(&tx.skbs); 5558 __skb_queue_tail(&tx.skbs, skb); 5559 res = ieee80211_tx_h_encrypt(&tx); 5560 check_skb = __skb_dequeue(&tx.skbs); 5561 /* we may crash after this, but it'd be a bug in crypto */ 5562 WARN_ON(check_skb != skb); 5563 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5564 return -EINVAL; 5565 5566 return 0; 5567 } 5568 5569 int ieee80211_encrypt_tx_skb(struct sk_buff *skb) 5570 { 5571 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 5572 struct ieee80211_sub_if_data *sdata = NULL; 5573 struct sk_buff *check_skb; 5574 struct ieee80211_tx_data tx; 5575 ieee80211_tx_result res; 5576 5577 if (!info->control.hw_key) 5578 return 0; 5579 5580 memset(&tx, 0, sizeof(tx)); 5581 tx.key = container_of(info->control.hw_key, struct ieee80211_key, conf); 5582 /* NULL it out now so we do full SW crypto */ 5583 info->control.hw_key = NULL; 5584 __skb_queue_head_init(&tx.skbs); 5585 __skb_queue_tail(&tx.skbs, skb); 5586 5587 if (skb->dev) 5588 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5589 else if (info->control.vif) 5590 sdata = vif_to_sdata(info->control.vif); 5591 5592 if (WARN_ON(!sdata)) 5593 return -EINVAL; 5594 5595 tx.sdata = sdata; 5596 tx.local = sdata->local; 5597 res = ieee80211_tx_h_encrypt(&tx); 5598 check_skb = __skb_dequeue(&tx.skbs); 5599 /* we may crash after this, but it'd be a bug in crypto */ 5600 WARN_ON(check_skb != skb); 5601 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5602 return -EINVAL; 5603 5604 return 0; 5605 } 5606 EXPORT_SYMBOL_GPL(ieee80211_encrypt_tx_skb); 5607 5608 static void 5609 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5610 struct ieee80211_vif *vif, 5611 struct ieee80211_link_data *link, 5612 struct ieee80211_mutable_offsets *offs, 5613 struct beacon_data *beacon, 5614 struct sk_buff *skb, 5615 struct ieee80211_chanctx_conf *chanctx_conf, 5616 u16 csa_off_base) 5617 { 5618 struct ieee80211_local *local = hw_to_local(hw); 5619 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5620 struct ieee80211_tx_info *info; 5621 enum nl80211_band band; 5622 struct ieee80211_tx_rate_control txrc; 5623 5624 /* CSA offsets */ 5625 if (offs && beacon) { 5626 u16 i; 5627 5628 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5629 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5630 5631 if (!csa_off) 5632 continue; 5633 5634 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5635 } 5636 } 5637 5638 band = chanctx_conf->def.chan->band; 5639 info = IEEE80211_SKB_CB(skb); 5640 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5641 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5642 info->band = band; 5643 5644 memset(&txrc, 0, sizeof(txrc)); 5645 txrc.hw = hw; 5646 txrc.sband = local->hw.wiphy->bands[band]; 5647 txrc.bss_conf = link->conf; 5648 txrc.skb = skb; 5649 txrc.reported_rate.idx = -1; 5650 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5651 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5652 else 5653 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5654 txrc.bss = true; 5655 rate_control_get_rate(sdata, NULL, &txrc); 5656 5657 info->control.vif = vif; 5658 info->control.flags |= u32_encode_bits(link->link_id, 5659 IEEE80211_TX_CTRL_MLO_LINK); 5660 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5661 IEEE80211_TX_CTL_ASSIGN_SEQ | 5662 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5663 } 5664 5665 static void 5666 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5667 u8 i) 5668 { 5669 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5670 i > beacon->mbssid_ies->cnt) 5671 return; 5672 5673 if (i < beacon->mbssid_ies->cnt) { 5674 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5675 beacon->mbssid_ies->elem[i].len); 5676 5677 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5678 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5679 beacon->rnr_ies->elem[i].len); 5680 5681 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5682 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5683 beacon->rnr_ies->elem[i].len); 5684 } 5685 return; 5686 } 5687 5688 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5689 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5690 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5691 beacon->mbssid_ies->elem[i].len); 5692 } 5693 5694 static struct sk_buff * 5695 __ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5696 struct ieee80211_vif *vif, 5697 struct ieee80211_link_data *link, 5698 struct ieee80211_mutable_offsets *offs, 5699 bool is_template, 5700 struct beacon_data *beacon, 5701 struct ieee80211_chanctx_conf *chanctx_conf, 5702 u8 ema_index) 5703 { 5704 struct ieee80211_local *local = hw_to_local(hw); 5705 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5706 struct ieee80211_if_ap *ap = &sdata->u.ap; 5707 struct sk_buff *skb = NULL; 5708 u16 csa_off_base = 0; 5709 int mbssid_len; 5710 5711 if (beacon->cntdwn_counter_offsets[0]) { 5712 if (!is_template) 5713 ieee80211_beacon_update_cntdwn(vif, link->link_id); 5714 5715 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5716 } 5717 5718 /* headroom, head length, 5719 * tail length, maximum TIM length and multiple BSSID length 5720 */ 5721 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5722 beacon->rnr_ies, 5723 ema_index); 5724 5725 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5726 beacon->tail_len + 256 + 5727 local->hw.extra_beacon_tailroom + mbssid_len + 5728 IEEE80211_ENCRYPT_TAILROOM); 5729 if (!skb) 5730 return NULL; 5731 5732 skb_reserve(skb, local->tx_headroom); 5733 skb_put_data(skb, beacon->head, beacon->head_len); 5734 5735 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5736 5737 if (offs) { 5738 offs->tim_offset = beacon->head_len; 5739 offs->tim_length = skb->len - beacon->head_len; 5740 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5741 5742 if (mbssid_len) { 5743 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5744 offs->mbssid_off = skb->len - mbssid_len; 5745 } 5746 5747 /* for AP the csa offsets are from tail */ 5748 csa_off_base = skb->len; 5749 } 5750 5751 if (beacon->tail) 5752 skb_put_data(skb, beacon->tail, beacon->tail_len); 5753 5754 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) { 5755 dev_kfree_skb(skb); 5756 return NULL; 5757 } 5758 5759 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5760 chanctx_conf, csa_off_base); 5761 return skb; 5762 } 5763 5764 static bool ieee80211_s1g_need_long_beacon(struct ieee80211_sub_if_data *sdata, 5765 struct ieee80211_link_data *link) 5766 { 5767 struct ps_data *ps = &sdata->u.ap.ps; 5768 5769 if (ps->sb_count == 0) 5770 ps->sb_count = link->conf->s1g_long_beacon_period - 1; 5771 else 5772 ps->sb_count--; 5773 5774 return ps->sb_count == 0; 5775 } 5776 5777 static struct sk_buff * 5778 ieee80211_s1g_short_beacon_get(struct ieee80211_hw *hw, 5779 struct ieee80211_vif *vif, 5780 struct ieee80211_link_data *link, 5781 struct ieee80211_chanctx_conf *chanctx_conf, 5782 struct s1g_short_beacon_data *sb, 5783 bool is_template) 5784 { 5785 struct ieee80211_local *local = hw_to_local(hw); 5786 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5787 struct ieee80211_if_ap *ap = &sdata->u.ap; 5788 struct sk_buff *skb; 5789 5790 skb = dev_alloc_skb(local->tx_headroom + sb->short_head_len + 5791 sb->short_tail_len + 256 + 5792 local->hw.extra_beacon_tailroom); 5793 if (!skb) 5794 return NULL; 5795 5796 skb_reserve(skb, local->tx_headroom); 5797 skb_put_data(skb, sb->short_head, sb->short_head_len); 5798 5799 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5800 5801 if (sb->short_tail) 5802 skb_put_data(skb, sb->short_tail, sb->short_tail_len); 5803 5804 ieee80211_beacon_get_finish(hw, vif, link, NULL, NULL, skb, 5805 chanctx_conf, 0); 5806 return skb; 5807 } 5808 5809 static struct sk_buff * 5810 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5811 struct ieee80211_link_data *link, 5812 struct ieee80211_mutable_offsets *offs, 5813 bool is_template, struct beacon_data *beacon, 5814 struct ieee80211_chanctx_conf *chanctx_conf, 5815 u8 ema_index, struct s1g_short_beacon_data *s1g_sb) 5816 { 5817 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5818 5819 if (!sdata->vif.cfg.s1g || !s1g_sb || 5820 ieee80211_s1g_need_long_beacon(sdata, link)) 5821 return __ieee80211_beacon_get_ap(hw, vif, link, offs, 5822 is_template, beacon, 5823 chanctx_conf, ema_index); 5824 5825 return ieee80211_s1g_short_beacon_get(hw, vif, link, chanctx_conf, 5826 s1g_sb, is_template); 5827 } 5828 5829 static struct ieee80211_ema_beacons * 5830 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5831 struct ieee80211_vif *vif, 5832 struct ieee80211_link_data *link, 5833 struct ieee80211_mutable_offsets *offs, 5834 bool is_template, struct beacon_data *beacon, 5835 struct ieee80211_chanctx_conf *chanctx_conf) 5836 { 5837 struct ieee80211_ema_beacons *ema = NULL; 5838 5839 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5840 return NULL; 5841 5842 ema = kzalloc_flex(*ema, bcn, beacon->mbssid_ies->cnt, GFP_ATOMIC); 5843 if (!ema) 5844 return NULL; 5845 5846 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5847 ema->bcn[ema->cnt].skb = 5848 ieee80211_beacon_get_ap(hw, vif, link, 5849 &ema->bcn[ema->cnt].offs, 5850 is_template, beacon, 5851 chanctx_conf, ema->cnt, NULL); 5852 if (!ema->bcn[ema->cnt].skb) 5853 break; 5854 } 5855 5856 if (ema->cnt == beacon->mbssid_ies->cnt) 5857 return ema; 5858 5859 ieee80211_beacon_free_ema_list(ema); 5860 return NULL; 5861 } 5862 5863 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5864 5865 static struct sk_buff * 5866 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5867 struct ieee80211_vif *vif, 5868 struct ieee80211_mutable_offsets *offs, 5869 bool is_template, 5870 unsigned int link_id, 5871 int ema_index, 5872 struct ieee80211_ema_beacons **ema_beacons) 5873 { 5874 struct ieee80211_local *local = hw_to_local(hw); 5875 struct beacon_data *beacon = NULL; 5876 struct sk_buff *skb = NULL; 5877 struct ieee80211_sub_if_data *sdata = NULL; 5878 struct ieee80211_chanctx_conf *chanctx_conf; 5879 struct ieee80211_link_data *link; 5880 struct s1g_short_beacon_data *s1g_short_bcn = NULL; 5881 5882 rcu_read_lock(); 5883 5884 sdata = vif_to_sdata(vif); 5885 link = rcu_dereference(sdata->link[link_id]); 5886 if (!link) 5887 goto out; 5888 chanctx_conf = 5889 rcu_dereference(link->conf->chanctx_conf); 5890 5891 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5892 goto out; 5893 5894 if (offs) 5895 memset(offs, 0, sizeof(*offs)); 5896 5897 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5898 beacon = rcu_dereference(link->u.ap.beacon); 5899 if (!beacon) 5900 goto out; 5901 5902 if (vif->cfg.s1g && link->u.ap.s1g_short_beacon) { 5903 s1g_short_bcn = 5904 rcu_dereference(link->u.ap.s1g_short_beacon); 5905 if (!s1g_short_bcn) 5906 goto out; 5907 } 5908 5909 if (ema_beacons) { 5910 *ema_beacons = 5911 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5912 offs, 5913 is_template, 5914 beacon, 5915 chanctx_conf); 5916 } else { 5917 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5918 if (ema_index >= beacon->mbssid_ies->cnt) 5919 goto out; /* End of MBSSID elements */ 5920 5921 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5922 ema_index = beacon->mbssid_ies->cnt; 5923 } else { 5924 ema_index = 0; 5925 } 5926 5927 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5928 is_template, beacon, 5929 chanctx_conf, ema_index, 5930 s1g_short_bcn); 5931 } 5932 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5933 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5934 struct ieee80211_hdr *hdr; 5935 5936 beacon = rcu_dereference(ifibss->presp); 5937 if (!beacon) 5938 goto out; 5939 5940 if (beacon->cntdwn_counter_offsets[0]) { 5941 if (!is_template) 5942 __ieee80211_beacon_update_cntdwn(link, beacon); 5943 5944 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5945 } 5946 5947 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5948 local->hw.extra_beacon_tailroom); 5949 if (!skb) 5950 goto out; 5951 skb_reserve(skb, local->tx_headroom); 5952 skb_put_data(skb, beacon->head, beacon->head_len); 5953 5954 hdr = (struct ieee80211_hdr *) skb->data; 5955 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5956 IEEE80211_STYPE_BEACON); 5957 5958 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5959 chanctx_conf, 0); 5960 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5961 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5962 5963 beacon = rcu_dereference(ifmsh->beacon); 5964 if (!beacon) 5965 goto out; 5966 5967 if (beacon->cntdwn_counter_offsets[0]) { 5968 if (!is_template) 5969 /* TODO: For mesh csa_counter is in TU, so 5970 * decrementing it by one isn't correct, but 5971 * for now we leave it consistent with overall 5972 * mac80211's behavior. 5973 */ 5974 __ieee80211_beacon_update_cntdwn(link, beacon); 5975 5976 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5977 } 5978 5979 if (ifmsh->sync_ops) 5980 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5981 5982 skb = dev_alloc_skb(local->tx_headroom + 5983 beacon->head_len + 5984 256 + /* TIM IE */ 5985 beacon->tail_len + 5986 local->hw.extra_beacon_tailroom); 5987 if (!skb) 5988 goto out; 5989 skb_reserve(skb, local->tx_headroom); 5990 skb_put_data(skb, beacon->head, beacon->head_len); 5991 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5992 is_template); 5993 5994 if (offs) { 5995 offs->tim_offset = beacon->head_len; 5996 offs->tim_length = skb->len - beacon->head_len; 5997 } 5998 5999 skb_put_data(skb, beacon->tail, beacon->tail_len); 6000 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 6001 chanctx_conf, 0); 6002 } else { 6003 WARN_ON(1); 6004 goto out; 6005 } 6006 6007 out: 6008 rcu_read_unlock(); 6009 return skb; 6010 6011 } 6012 6013 struct sk_buff * 6014 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 6015 struct ieee80211_vif *vif, 6016 struct ieee80211_mutable_offsets *offs, 6017 unsigned int link_id) 6018 { 6019 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 6020 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 6021 } 6022 EXPORT_SYMBOL(ieee80211_beacon_get_template); 6023 6024 struct sk_buff * 6025 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 6026 struct ieee80211_vif *vif, 6027 struct ieee80211_mutable_offsets *offs, 6028 unsigned int link_id, u8 ema_index) 6029 { 6030 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 6031 NULL); 6032 } 6033 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 6034 6035 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 6036 { 6037 u8 i; 6038 6039 if (!ema_beacons) 6040 return; 6041 6042 for (i = 0; i < ema_beacons->cnt; i++) 6043 kfree_skb(ema_beacons->bcn[i].skb); 6044 6045 kfree(ema_beacons); 6046 } 6047 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 6048 6049 struct ieee80211_ema_beacons * 6050 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 6051 struct ieee80211_vif *vif, 6052 unsigned int link_id) 6053 { 6054 struct ieee80211_ema_beacons *ema_beacons = NULL; 6055 6056 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 6057 &ema_beacons)); 6058 6059 return ema_beacons; 6060 } 6061 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 6062 6063 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 6064 struct ieee80211_vif *vif, 6065 u16 *tim_offset, u16 *tim_length, 6066 unsigned int link_id) 6067 { 6068 struct ieee80211_mutable_offsets offs = {}; 6069 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 6070 link_id, 6071 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 6072 NULL); 6073 struct sk_buff *copy; 6074 6075 if (!bcn) 6076 return bcn; 6077 6078 if (tim_offset) 6079 *tim_offset = offs.tim_offset; 6080 6081 if (tim_length) 6082 *tim_length = offs.tim_length; 6083 6084 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 6085 !hw_to_local(hw)->monitors) 6086 return bcn; 6087 6088 /* send a copy to monitor interfaces */ 6089 copy = skb_copy(bcn, GFP_ATOMIC); 6090 if (!copy) 6091 return bcn; 6092 6093 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, NULL); 6094 6095 return bcn; 6096 } 6097 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 6098 6099 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 6100 struct ieee80211_vif *vif) 6101 { 6102 struct sk_buff *skb = NULL; 6103 struct probe_resp *presp = NULL; 6104 struct ieee80211_hdr *hdr; 6105 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6106 6107 if (sdata->vif.type != NL80211_IFTYPE_AP) 6108 return NULL; 6109 6110 rcu_read_lock(); 6111 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 6112 if (!presp) 6113 goto out; 6114 6115 skb = dev_alloc_skb(presp->len); 6116 if (!skb) 6117 goto out; 6118 6119 skb_put_data(skb, presp->data, presp->len); 6120 6121 hdr = (struct ieee80211_hdr *) skb->data; 6122 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 6123 6124 out: 6125 rcu_read_unlock(); 6126 return skb; 6127 } 6128 EXPORT_SYMBOL(ieee80211_proberesp_get); 6129 6130 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 6131 struct ieee80211_vif *vif, 6132 unsigned int link_id) 6133 { 6134 struct sk_buff *skb = NULL; 6135 struct fils_discovery_data *tmpl = NULL; 6136 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6137 struct ieee80211_link_data *link; 6138 6139 if (sdata->vif.type != NL80211_IFTYPE_AP) 6140 return NULL; 6141 6142 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6143 return NULL; 6144 6145 guard(rcu)(); 6146 link = rcu_dereference(sdata->link[link_id]); 6147 if (!link) 6148 return NULL; 6149 6150 tmpl = rcu_dereference(link->u.ap.fils_discovery); 6151 if (!tmpl) 6152 return NULL; 6153 6154 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6155 if (skb) { 6156 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6157 skb_put_data(skb, tmpl->data, tmpl->len); 6158 } 6159 6160 return skb; 6161 } 6162 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 6163 6164 struct sk_buff * 6165 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 6166 struct ieee80211_vif *vif, 6167 unsigned int link_id) 6168 { 6169 struct sk_buff *skb = NULL; 6170 struct unsol_bcast_probe_resp_data *tmpl = NULL; 6171 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6172 struct ieee80211_link_data *link; 6173 6174 if (sdata->vif.type != NL80211_IFTYPE_AP) 6175 return NULL; 6176 6177 if (link_id >= IEEE80211_MLD_MAX_NUM_LINKS) 6178 return NULL; 6179 6180 guard(rcu)(); 6181 link = rcu_dereference(sdata->link[link_id]); 6182 if (!link) 6183 return NULL; 6184 6185 tmpl = rcu_dereference(link->u.ap.unsol_bcast_probe_resp); 6186 if (!tmpl) 6187 return NULL; 6188 6189 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 6190 if (skb) { 6191 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 6192 skb_put_data(skb, tmpl->data, tmpl->len); 6193 } 6194 6195 return skb; 6196 } 6197 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 6198 6199 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 6200 struct ieee80211_vif *vif) 6201 { 6202 struct ieee80211_sub_if_data *sdata; 6203 struct ieee80211_pspoll *pspoll; 6204 struct ieee80211_local *local; 6205 struct sk_buff *skb; 6206 6207 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6208 return NULL; 6209 6210 sdata = vif_to_sdata(vif); 6211 local = sdata->local; 6212 6213 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 6214 if (!skb) 6215 return NULL; 6216 6217 skb_reserve(skb, local->hw.extra_tx_headroom); 6218 6219 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 6220 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 6221 IEEE80211_STYPE_PSPOLL); 6222 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 6223 6224 /* aid in PS-Poll has its two MSBs each set to 1 */ 6225 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 6226 6227 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 6228 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 6229 6230 return skb; 6231 } 6232 EXPORT_SYMBOL(ieee80211_pspoll_get); 6233 6234 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 6235 struct ieee80211_vif *vif, 6236 int link_id, bool qos_ok) 6237 { 6238 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 6239 struct ieee80211_local *local = sdata->local; 6240 struct ieee80211_link_data *link = NULL; 6241 struct ieee80211_hdr_3addr *nullfunc; 6242 struct sk_buff *skb; 6243 bool qos = false; 6244 6245 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 6246 return NULL; 6247 6248 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6249 sizeof(*nullfunc) + 2); 6250 if (!skb) 6251 return NULL; 6252 6253 rcu_read_lock(); 6254 if (qos_ok) { 6255 struct sta_info *sta; 6256 6257 sta = sta_info_get(sdata, vif->cfg.ap_addr); 6258 qos = sta && sta->sta.wme; 6259 } 6260 6261 if (link_id >= 0) { 6262 link = rcu_dereference(sdata->link[link_id]); 6263 if (WARN_ON_ONCE(!link)) { 6264 rcu_read_unlock(); 6265 kfree_skb(skb); 6266 return NULL; 6267 } 6268 } 6269 6270 skb_reserve(skb, local->hw.extra_tx_headroom); 6271 6272 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 6273 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 6274 IEEE80211_STYPE_NULLFUNC | 6275 IEEE80211_FCTL_TODS); 6276 if (qos) { 6277 __le16 qoshdr = cpu_to_le16(7); 6278 6279 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 6280 IEEE80211_STYPE_NULLFUNC) != 6281 IEEE80211_STYPE_QOS_NULLFUNC); 6282 nullfunc->frame_control |= 6283 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 6284 skb->priority = 7; 6285 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 6286 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 6287 } 6288 6289 if (link) { 6290 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 6291 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 6292 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 6293 } else { 6294 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 6295 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 6296 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 6297 } 6298 rcu_read_unlock(); 6299 6300 return skb; 6301 } 6302 EXPORT_SYMBOL(ieee80211_nullfunc_get); 6303 6304 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 6305 const u8 *src_addr, 6306 const u8 *ssid, size_t ssid_len, 6307 size_t tailroom) 6308 { 6309 struct ieee80211_local *local = hw_to_local(hw); 6310 struct ieee80211_hdr_3addr *hdr; 6311 struct sk_buff *skb; 6312 size_t ie_ssid_len; 6313 u8 *pos; 6314 6315 ie_ssid_len = 2 + ssid_len; 6316 6317 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 6318 ie_ssid_len + tailroom); 6319 if (!skb) 6320 return NULL; 6321 6322 skb_reserve(skb, local->hw.extra_tx_headroom); 6323 6324 hdr = skb_put_zero(skb, sizeof(*hdr)); 6325 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 6326 IEEE80211_STYPE_PROBE_REQ); 6327 eth_broadcast_addr(hdr->addr1); 6328 memcpy(hdr->addr2, src_addr, ETH_ALEN); 6329 eth_broadcast_addr(hdr->addr3); 6330 6331 pos = skb_put(skb, ie_ssid_len); 6332 *pos++ = WLAN_EID_SSID; 6333 *pos++ = ssid_len; 6334 if (ssid_len) 6335 memcpy(pos, ssid, ssid_len); 6336 pos += ssid_len; 6337 6338 return skb; 6339 } 6340 EXPORT_SYMBOL(ieee80211_probereq_get); 6341 6342 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6343 const void *frame, size_t frame_len, 6344 const struct ieee80211_tx_info *frame_txctl, 6345 struct ieee80211_rts *rts) 6346 { 6347 const struct ieee80211_hdr *hdr = frame; 6348 6349 rts->frame_control = 6350 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 6351 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 6352 frame_txctl); 6353 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 6354 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 6355 } 6356 EXPORT_SYMBOL(ieee80211_rts_get); 6357 6358 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 6359 const void *frame, size_t frame_len, 6360 const struct ieee80211_tx_info *frame_txctl, 6361 struct ieee80211_cts *cts) 6362 { 6363 const struct ieee80211_hdr *hdr = frame; 6364 6365 cts->frame_control = 6366 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 6367 cts->duration = ieee80211_ctstoself_duration(hw, vif, 6368 frame_len, frame_txctl); 6369 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 6370 } 6371 EXPORT_SYMBOL(ieee80211_ctstoself_get); 6372 6373 struct sk_buff * 6374 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 6375 struct ieee80211_vif *vif) 6376 { 6377 struct ieee80211_local *local = hw_to_local(hw); 6378 struct sk_buff *skb = NULL; 6379 struct ieee80211_tx_data tx; 6380 struct ieee80211_sub_if_data *sdata; 6381 struct ps_data *ps; 6382 struct ieee80211_tx_info *info; 6383 struct ieee80211_chanctx_conf *chanctx_conf; 6384 6385 sdata = vif_to_sdata(vif); 6386 6387 rcu_read_lock(); 6388 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6389 6390 if (!chanctx_conf) 6391 goto out; 6392 6393 if (sdata->vif.type == NL80211_IFTYPE_AP) { 6394 struct beacon_data *beacon = 6395 rcu_dereference(sdata->deflink.u.ap.beacon); 6396 6397 if (!beacon || !beacon->head) 6398 goto out; 6399 6400 ps = &sdata->u.ap.ps; 6401 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 6402 ps = &sdata->u.mesh.ps; 6403 } else { 6404 goto out; 6405 } 6406 6407 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 6408 goto out; /* send buffered bc/mc only after DTIM beacon */ 6409 6410 while (1) { 6411 skb = skb_dequeue(&ps->bc_buf); 6412 if (!skb) 6413 goto out; 6414 local->total_ps_buffered--; 6415 6416 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 6417 struct ieee80211_hdr *hdr = 6418 (struct ieee80211_hdr *) skb->data; 6419 /* more buffered multicast/broadcast frames ==> set 6420 * MoreData flag in IEEE 802.11 header to inform PS 6421 * STAs */ 6422 hdr->frame_control |= 6423 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 6424 } 6425 6426 if (sdata->vif.type == NL80211_IFTYPE_AP) 6427 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 6428 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 6429 break; 6430 ieee80211_free_txskb(hw, skb); 6431 } 6432 6433 info = IEEE80211_SKB_CB(skb); 6434 6435 tx.flags |= IEEE80211_TX_PS_BUFFERED; 6436 info->band = chanctx_conf->def.chan->band; 6437 6438 if (invoke_tx_handlers(&tx)) 6439 skb = NULL; 6440 out: 6441 rcu_read_unlock(); 6442 6443 return skb; 6444 } 6445 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 6446 6447 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6448 { 6449 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6450 struct ieee80211_sub_if_data *sdata = sta->sdata; 6451 struct ieee80211_local *local = sdata->local; 6452 int ret; 6453 u32 queues; 6454 6455 lockdep_assert_wiphy(local->hw.wiphy); 6456 6457 /* only some cases are supported right now */ 6458 switch (sdata->vif.type) { 6459 case NL80211_IFTYPE_STATION: 6460 case NL80211_IFTYPE_AP: 6461 case NL80211_IFTYPE_AP_VLAN: 6462 break; 6463 default: 6464 WARN_ON(1); 6465 return -EINVAL; 6466 } 6467 6468 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 6469 return -EINVAL; 6470 6471 if (sta->reserved_tid == tid) { 6472 ret = 0; 6473 goto out; 6474 } 6475 6476 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 6477 sdata_err(sdata, "TID reservation already active\n"); 6478 ret = -EALREADY; 6479 goto out; 6480 } 6481 6482 ieee80211_stop_vif_queues(sdata->local, sdata, 6483 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6484 6485 synchronize_net(); 6486 6487 /* Tear down BA sessions so we stop aggregating on this TID */ 6488 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 6489 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 6490 __ieee80211_stop_tx_ba_session(sta, tid, 6491 AGG_STOP_LOCAL_REQUEST); 6492 } 6493 6494 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 6495 __ieee80211_flush_queues(local, sdata, queues, false); 6496 6497 sta->reserved_tid = tid; 6498 6499 ieee80211_wake_vif_queues(local, sdata, 6500 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 6501 6502 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 6503 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 6504 6505 ret = 0; 6506 out: 6507 return ret; 6508 } 6509 EXPORT_SYMBOL(ieee80211_reserve_tid); 6510 6511 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 6512 { 6513 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 6514 struct ieee80211_sub_if_data *sdata = sta->sdata; 6515 6516 lockdep_assert_wiphy(sdata->local->hw.wiphy); 6517 6518 /* only some cases are supported right now */ 6519 switch (sdata->vif.type) { 6520 case NL80211_IFTYPE_STATION: 6521 case NL80211_IFTYPE_AP: 6522 case NL80211_IFTYPE_AP_VLAN: 6523 break; 6524 default: 6525 WARN_ON(1); 6526 return; 6527 } 6528 6529 if (tid != sta->reserved_tid) { 6530 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6531 return; 6532 } 6533 6534 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6535 } 6536 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6537 6538 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6539 struct sk_buff *skb, struct sta_info *sta, 6540 int tid, int link_id, 6541 enum nl80211_band band) 6542 { 6543 const struct ieee80211_hdr *hdr = (void *)skb->data; 6544 int ac = ieee80211_ac_from_tid(tid); 6545 unsigned int link; 6546 6547 skb_reset_mac_header(skb); 6548 skb_set_queue_mapping(skb, ac); 6549 skb->priority = tid; 6550 6551 skb->dev = sdata->dev; 6552 6553 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6554 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6555 IEEE80211_LINK_UNSPECIFIED)); 6556 6557 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6558 link = 0; 6559 } else if (link_id >= 0) { 6560 link = link_id; 6561 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6562 /* address from the MLD */ 6563 link = IEEE80211_LINK_UNSPECIFIED; 6564 } else { 6565 /* otherwise must be addressed from a link */ 6566 rcu_read_lock(); 6567 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6568 struct ieee80211_bss_conf *link_conf; 6569 6570 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6571 if (!link_conf) 6572 continue; 6573 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6574 break; 6575 } 6576 rcu_read_unlock(); 6577 6578 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6579 link = ffs(sdata->vif.active_links) - 1; 6580 } 6581 6582 IEEE80211_SKB_CB(skb)->control.flags |= 6583 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6584 6585 /* 6586 * The other path calling ieee80211_xmit is from the tasklet, 6587 * and while we can handle concurrent transmissions locking 6588 * requirements are that we do not come into tx with bhs on. 6589 */ 6590 local_bh_disable(); 6591 IEEE80211_SKB_CB(skb)->band = band; 6592 ieee80211_xmit(sdata, sta, skb); 6593 local_bh_enable(); 6594 } 6595 6596 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6597 struct sk_buff *skb, struct sta_info *sta, 6598 int tid, int link_id) 6599 { 6600 struct ieee80211_chanctx_conf *chanctx_conf; 6601 enum nl80211_band band; 6602 6603 rcu_read_lock(); 6604 if (sdata->vif.type == NL80211_IFTYPE_NAN || 6605 sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 6606 band = NUM_NL80211_BANDS; 6607 } else if (!ieee80211_vif_is_mld(&sdata->vif)) { 6608 WARN_ON(link_id >= 0); 6609 chanctx_conf = 6610 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6611 if (WARN_ON(!chanctx_conf)) { 6612 rcu_read_unlock(); 6613 ieee80211_free_txskb(&sdata->local->hw, skb); 6614 return; 6615 } 6616 band = chanctx_conf->def.chan->band; 6617 } else { 6618 WARN_ON(link_id >= 0 && 6619 !(sdata->vif.active_links & BIT(link_id))); 6620 /* MLD transmissions must not rely on the band */ 6621 band = 0; 6622 } 6623 6624 __ieee80211_tx_skb_tid_band(sdata, skb, sta, tid, link_id, band); 6625 rcu_read_unlock(); 6626 } 6627 6628 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6629 const u8 *buf, size_t len, 6630 const u8 *dest, __be16 proto, bool unencrypted, 6631 int link_id, u64 cookie) 6632 { 6633 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6634 struct ieee80211_local *local = sdata->local; 6635 struct ieee80211_tx_info *info; 6636 bool group_addressed; 6637 struct sta_info *sta; 6638 struct sk_buff *skb; 6639 struct ethhdr *ehdr; 6640 u32 ctrl_flags = 0; 6641 u32 flags = 0; 6642 int err; 6643 6644 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6645 * or Pre-Authentication 6646 */ 6647 if (proto != sdata->control_port_protocol && 6648 proto != cpu_to_be16(ETH_P_PREAUTH)) 6649 return -EINVAL; 6650 6651 if (proto == sdata->control_port_protocol) 6652 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6653 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6654 6655 if (unencrypted) 6656 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6657 6658 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6659 6660 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6661 sizeof(struct ethhdr) + len); 6662 if (!skb) 6663 return -ENOMEM; 6664 6665 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6666 6667 skb_put_data(skb, buf, len); 6668 6669 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6670 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6671 6672 /* we may override the SA for MLO STA later */ 6673 if (link_id < 0) { 6674 link_id = IEEE80211_LINK_UNSPECIFIED; 6675 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6676 } else { 6677 struct ieee80211_bss_conf *link_conf; 6678 6679 rcu_read_lock(); 6680 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6681 if (!link_conf) { 6682 dev_kfree_skb(skb); 6683 rcu_read_unlock(); 6684 return -ENOLINK; 6685 } 6686 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6687 rcu_read_unlock(); 6688 } 6689 6690 ehdr->h_proto = proto; 6691 6692 skb->dev = dev; 6693 skb->protocol = proto; 6694 skb_reset_network_header(skb); 6695 skb_reset_mac_header(skb); 6696 6697 /* update QoS header to prioritize control port frames if possible, 6698 * prioritization also happens for control port frames send over 6699 * AF_PACKET 6700 */ 6701 rcu_read_lock(); 6702 6703 /* do_stop() synchronizes RCU before the interface type can change */ 6704 if (!ieee80211_sdata_running(sdata)) { 6705 dev_kfree_skb(skb); 6706 rcu_read_unlock(); 6707 return -ENETDOWN; 6708 } 6709 6710 err = ieee80211_lookup_ra_sta(sdata, skb, &sta, true); 6711 if (err) { 6712 dev_kfree_skb(skb); 6713 rcu_read_unlock(); 6714 return err; 6715 } 6716 6717 group_addressed = IS_ERR(sta); 6718 if (IS_ERR(sta)) 6719 sta = NULL; 6720 6721 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 6722 6723 /* 6724 * for MLO STA, the SA should be the AP MLD address, but 6725 * the link ID has been selected already 6726 */ 6727 if (sta && sta->sta.mlo) 6728 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6729 6730 info = IEEE80211_SKB_CB(skb); 6731 memset(info, 0, sizeof(*info)); 6732 info->flags = flags; 6733 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 6734 info->control.flags = ctrl_flags; 6735 6736 if (!group_addressed) 6737 ieee80211_store_ack_skb(local, skb, cookie); 6738 6739 skb = ieee80211_build_hdr(sdata, skb, sta); 6740 if (IS_ERR(skb)) { 6741 rcu_read_unlock(); 6742 return PTR_ERR(skb); 6743 } 6744 6745 if (link_id != u32_get_bits(info->control.flags, 6746 IEEE80211_TX_CTRL_MLO_LINK)) { 6747 ieee80211_free_txskb(&local->hw, skb); 6748 rcu_read_unlock(); 6749 return -EINVAL; 6750 } 6751 6752 local_bh_disable(); 6753 dev_sw_netstats_tx_add(dev, 1, skb->len); 6754 ieee80211_tpt_led_trig_tx(local, skb->len); 6755 ieee80211_xmit(sdata, sta, skb); 6756 local_bh_enable(); 6757 rcu_read_unlock(); 6758 6759 return 0; 6760 } 6761 6762 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6763 const u8 *buf, size_t len) 6764 { 6765 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6766 struct ieee80211_local *local = sdata->local; 6767 struct sk_buff *skb; 6768 6769 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6770 30 + /* header size */ 6771 18); /* 11s header size */ 6772 if (!skb) 6773 return -ENOMEM; 6774 6775 skb_reserve(skb, local->hw.extra_tx_headroom); 6776 skb_put_data(skb, buf, len); 6777 6778 skb->dev = dev; 6779 skb->protocol = htons(ETH_P_802_3); 6780 skb_reset_network_header(skb); 6781 skb_reset_mac_header(skb); 6782 6783 local_bh_disable(); 6784 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6785 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP); 6786 local_bh_enable(); 6787 6788 return 0; 6789 } 6790