1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2022 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 #include <net/gso.h> 30 31 #include "ieee80211_i.h" 32 #include "driver-ops.h" 33 #include "led.h" 34 #include "mesh.h" 35 #include "wep.h" 36 #include "wpa.h" 37 #include "wme.h" 38 #include "rate.h" 39 40 /* misc utils */ 41 42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 43 struct sk_buff *skb, int group_addr, 44 int next_frag_len) 45 { 46 int rate, mrate, erp, dur, i, shift = 0; 47 struct ieee80211_rate *txrate; 48 struct ieee80211_local *local = tx->local; 49 struct ieee80211_supported_band *sband; 50 struct ieee80211_hdr *hdr; 51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 52 struct ieee80211_chanctx_conf *chanctx_conf; 53 u32 rate_flags = 0; 54 55 /* assume HW handles this */ 56 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 57 return 0; 58 59 rcu_read_lock(); 60 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 61 if (chanctx_conf) { 62 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 63 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 64 } 65 rcu_read_unlock(); 66 67 /* uh huh? */ 68 if (WARN_ON_ONCE(tx->rate.idx < 0)) 69 return 0; 70 71 sband = local->hw.wiphy->bands[info->band]; 72 txrate = &sband->bitrates[tx->rate.idx]; 73 74 erp = txrate->flags & IEEE80211_RATE_ERP_G; 75 76 /* device is expected to do this */ 77 if (sband->band == NL80211_BAND_S1GHZ) 78 return 0; 79 80 /* 81 * data and mgmt (except PS Poll): 82 * - during CFP: 32768 83 * - during contention period: 84 * if addr1 is group address: 0 85 * if more fragments = 0 and addr1 is individual address: time to 86 * transmit one ACK plus SIFS 87 * if more fragments = 1 and addr1 is individual address: time to 88 * transmit next fragment plus 2 x ACK plus 3 x SIFS 89 * 90 * IEEE 802.11, 9.6: 91 * - control response frame (CTS or ACK) shall be transmitted using the 92 * same rate as the immediately previous frame in the frame exchange 93 * sequence, if this rate belongs to the PHY mandatory rates, or else 94 * at the highest possible rate belonging to the PHY rates in the 95 * BSSBasicRateSet 96 */ 97 hdr = (struct ieee80211_hdr *)skb->data; 98 if (ieee80211_is_ctl(hdr->frame_control)) { 99 /* TODO: These control frames are not currently sent by 100 * mac80211, but should they be implemented, this function 101 * needs to be updated to support duration field calculation. 102 * 103 * RTS: time needed to transmit pending data/mgmt frame plus 104 * one CTS frame plus one ACK frame plus 3 x SIFS 105 * CTS: duration of immediately previous RTS minus time 106 * required to transmit CTS and its SIFS 107 * ACK: 0 if immediately previous directed data/mgmt had 108 * more=0, with more=1 duration in ACK frame is duration 109 * from previous frame minus time needed to transmit ACK 110 * and its SIFS 111 * PS Poll: BIT(15) | BIT(14) | aid 112 */ 113 return 0; 114 } 115 116 /* data/mgmt */ 117 if (0 /* FIX: data/mgmt during CFP */) 118 return cpu_to_le16(32768); 119 120 if (group_addr) /* Group address as the destination - no ACK */ 121 return 0; 122 123 /* Individual destination address: 124 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 125 * CTS and ACK frames shall be transmitted using the highest rate in 126 * basic rate set that is less than or equal to the rate of the 127 * immediately previous frame and that is using the same modulation 128 * (CCK or OFDM). If no basic rate set matches with these requirements, 129 * the highest mandatory rate of the PHY that is less than or equal to 130 * the rate of the previous frame is used. 131 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 132 */ 133 rate = -1; 134 /* use lowest available if everything fails */ 135 mrate = sband->bitrates[0].bitrate; 136 for (i = 0; i < sband->n_bitrates; i++) { 137 struct ieee80211_rate *r = &sband->bitrates[i]; 138 139 if (r->bitrate > txrate->bitrate) 140 break; 141 142 if ((rate_flags & r->flags) != rate_flags) 143 continue; 144 145 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 146 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 147 148 switch (sband->band) { 149 case NL80211_BAND_2GHZ: 150 case NL80211_BAND_LC: { 151 u32 flag; 152 if (tx->sdata->deflink.operating_11g_mode) 153 flag = IEEE80211_RATE_MANDATORY_G; 154 else 155 flag = IEEE80211_RATE_MANDATORY_B; 156 if (r->flags & flag) 157 mrate = r->bitrate; 158 break; 159 } 160 case NL80211_BAND_5GHZ: 161 case NL80211_BAND_6GHZ: 162 if (r->flags & IEEE80211_RATE_MANDATORY_A) 163 mrate = r->bitrate; 164 break; 165 case NL80211_BAND_S1GHZ: 166 case NL80211_BAND_60GHZ: 167 /* TODO, for now fall through */ 168 case NUM_NL80211_BANDS: 169 WARN_ON(1); 170 break; 171 } 172 } 173 if (rate == -1) { 174 /* No matching basic rate found; use highest suitable mandatory 175 * PHY rate */ 176 rate = DIV_ROUND_UP(mrate, 1 << shift); 177 } 178 179 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 180 if (ieee80211_is_data_qos(hdr->frame_control) && 181 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 182 dur = 0; 183 else 184 /* Time needed to transmit ACK 185 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 186 * to closest integer */ 187 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 188 tx->sdata->vif.bss_conf.use_short_preamble, 189 shift); 190 191 if (next_frag_len) { 192 /* Frame is fragmented: duration increases with time needed to 193 * transmit next fragment plus ACK and 2 x SIFS. */ 194 dur *= 2; /* ACK + SIFS */ 195 /* next fragment */ 196 dur += ieee80211_frame_duration(sband->band, next_frag_len, 197 txrate->bitrate, erp, 198 tx->sdata->vif.bss_conf.use_short_preamble, 199 shift); 200 } 201 202 return cpu_to_le16(dur); 203 } 204 205 /* tx handlers */ 206 static ieee80211_tx_result debug_noinline 207 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 208 { 209 struct ieee80211_local *local = tx->local; 210 struct ieee80211_if_managed *ifmgd; 211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 wiphy_work_queue(local->hw.wiphy, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline 284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_any_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 315 return TX_CONTINUE; 316 317 if (tx->sta) 318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 319 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 321 if (unlikely(!assoc && 322 ieee80211_is_data(hdr->frame_control))) { 323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 324 sdata_info(tx->sdata, 325 "dropped data frame to not associated station %pM\n", 326 hdr->addr1); 327 #endif 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 329 return TX_DROP; 330 } 331 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 332 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 333 /* 334 * No associated STAs - no need to send multicast 335 * frames. 336 */ 337 return TX_DROP; 338 } 339 340 return TX_CONTINUE; 341 } 342 343 /* This function is called whenever the AP is about to exceed the maximum limit 344 * of buffered frames for power saving STAs. This situation should not really 345 * happen often during normal operation, so dropping the oldest buffered packet 346 * from each queue should be OK to make some room for new frames. */ 347 static void purge_old_ps_buffers(struct ieee80211_local *local) 348 { 349 int total = 0, purged = 0; 350 struct sk_buff *skb; 351 struct ieee80211_sub_if_data *sdata; 352 struct sta_info *sta; 353 354 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 355 struct ps_data *ps; 356 357 if (sdata->vif.type == NL80211_IFTYPE_AP) 358 ps = &sdata->u.ap.ps; 359 else if (ieee80211_vif_is_mesh(&sdata->vif)) 360 ps = &sdata->u.mesh.ps; 361 else 362 continue; 363 364 skb = skb_dequeue(&ps->bc_buf); 365 if (skb) { 366 purged++; 367 ieee80211_free_txskb(&local->hw, skb); 368 } 369 total += skb_queue_len(&ps->bc_buf); 370 } 371 372 /* 373 * Drop one frame from each station from the lowest-priority 374 * AC that has frames at all. 375 */ 376 list_for_each_entry_rcu(sta, &local->sta_list, list) { 377 int ac; 378 379 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 380 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 381 total += skb_queue_len(&sta->ps_tx_buf[ac]); 382 if (skb) { 383 purged++; 384 ieee80211_free_txskb(&local->hw, skb); 385 break; 386 } 387 } 388 } 389 390 local->total_ps_buffered = total; 391 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 392 } 393 394 static ieee80211_tx_result 395 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 396 { 397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 399 struct ps_data *ps; 400 401 /* 402 * broadcast/multicast frame 403 * 404 * If any of the associated/peer stations is in power save mode, 405 * the frame is buffered to be sent after DTIM beacon frame. 406 * This is done either by the hardware or us. 407 */ 408 409 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 410 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 411 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 412 if (!tx->sdata->bss) 413 return TX_CONTINUE; 414 415 ps = &tx->sdata->bss->ps; 416 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 417 ps = &tx->sdata->u.mesh.ps; 418 } else { 419 return TX_CONTINUE; 420 } 421 422 423 /* no buffering for ordered frames */ 424 if (ieee80211_has_order(hdr->frame_control)) 425 return TX_CONTINUE; 426 427 if (ieee80211_is_probe_req(hdr->frame_control)) 428 return TX_CONTINUE; 429 430 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 431 info->hw_queue = tx->sdata->vif.cab_queue; 432 433 /* no stations in PS mode and no buffered packets */ 434 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 435 return TX_CONTINUE; 436 437 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 438 439 /* device releases frame after DTIM beacon */ 440 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 441 return TX_CONTINUE; 442 443 /* buffered in mac80211 */ 444 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 445 purge_old_ps_buffers(tx->local); 446 447 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 448 ps_dbg(tx->sdata, 449 "BC TX buffer full - dropping the oldest frame\n"); 450 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 451 } else 452 tx->local->total_ps_buffered++; 453 454 skb_queue_tail(&ps->bc_buf, tx->skb); 455 456 return TX_QUEUED; 457 } 458 459 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 460 struct sk_buff *skb) 461 { 462 if (!ieee80211_is_mgmt(fc)) 463 return 0; 464 465 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 466 return 0; 467 468 if (!ieee80211_is_robust_mgmt_frame(skb)) 469 return 0; 470 471 return 1; 472 } 473 474 static ieee80211_tx_result 475 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 476 { 477 struct sta_info *sta = tx->sta; 478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 480 struct ieee80211_local *local = tx->local; 481 482 if (unlikely(!sta)) 483 return TX_CONTINUE; 484 485 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 486 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 487 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 488 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 489 int ac = skb_get_queue_mapping(tx->skb); 490 491 if (ieee80211_is_mgmt(hdr->frame_control) && 492 !ieee80211_is_bufferable_mmpdu(tx->skb)) { 493 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 494 return TX_CONTINUE; 495 } 496 497 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 498 sta->sta.addr, sta->sta.aid, ac); 499 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 500 purge_old_ps_buffers(tx->local); 501 502 /* sync with ieee80211_sta_ps_deliver_wakeup */ 503 spin_lock(&sta->ps_lock); 504 /* 505 * STA woke up the meantime and all the frames on ps_tx_buf have 506 * been queued to pending queue. No reordering can happen, go 507 * ahead and Tx the packet. 508 */ 509 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 510 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 511 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 512 spin_unlock(&sta->ps_lock); 513 return TX_CONTINUE; 514 } 515 516 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 517 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 518 ps_dbg(tx->sdata, 519 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 520 sta->sta.addr, ac); 521 ieee80211_free_txskb(&local->hw, old); 522 } else 523 tx->local->total_ps_buffered++; 524 525 info->control.jiffies = jiffies; 526 info->control.vif = &tx->sdata->vif; 527 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 528 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 529 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 530 spin_unlock(&sta->ps_lock); 531 532 if (!timer_pending(&local->sta_cleanup)) 533 mod_timer(&local->sta_cleanup, 534 round_jiffies(jiffies + 535 STA_INFO_CLEANUP_INTERVAL)); 536 537 /* 538 * We queued up some frames, so the TIM bit might 539 * need to be set, recalculate it. 540 */ 541 sta_info_recalc_tim(sta); 542 543 return TX_QUEUED; 544 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 545 ps_dbg(tx->sdata, 546 "STA %pM in PS mode, but polling/in SP -> send frame\n", 547 sta->sta.addr); 548 } 549 550 return TX_CONTINUE; 551 } 552 553 static ieee80211_tx_result debug_noinline 554 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 555 { 556 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 557 return TX_CONTINUE; 558 559 if (tx->flags & IEEE80211_TX_UNICAST) 560 return ieee80211_tx_h_unicast_ps_buf(tx); 561 else 562 return ieee80211_tx_h_multicast_ps_buf(tx); 563 } 564 565 static ieee80211_tx_result debug_noinline 566 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 567 { 568 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 569 570 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 571 if (tx->sdata->control_port_no_encrypt) 572 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 573 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 574 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 575 } 576 577 return TX_CONTINUE; 578 } 579 580 static struct ieee80211_key * 581 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 582 { 583 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 584 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 585 struct ieee80211_link_data *link; 586 unsigned int link_id; 587 588 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 589 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 590 link = &tx->sdata->deflink; 591 } else { 592 link = rcu_dereference(tx->sdata->link[link_id]); 593 if (!link) 594 return NULL; 595 } 596 597 if (ieee80211_is_group_privacy_action(tx->skb)) 598 return rcu_dereference(link->default_multicast_key); 599 else if (ieee80211_is_mgmt(hdr->frame_control) && 600 is_multicast_ether_addr(hdr->addr1) && 601 ieee80211_is_robust_mgmt_frame(tx->skb)) 602 return rcu_dereference(link->default_mgmt_key); 603 else if (is_multicast_ether_addr(hdr->addr1)) 604 return rcu_dereference(link->default_multicast_key); 605 606 return NULL; 607 } 608 609 static ieee80211_tx_result debug_noinline 610 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 611 { 612 struct ieee80211_key *key; 613 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 614 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 615 616 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 617 tx->key = NULL; 618 return TX_CONTINUE; 619 } 620 621 if (tx->sta && 622 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 623 tx->key = key; 624 else if ((key = ieee80211_select_link_key(tx))) 625 tx->key = key; 626 else if (!is_multicast_ether_addr(hdr->addr1) && 627 (key = rcu_dereference(tx->sdata->default_unicast_key))) 628 tx->key = key; 629 else 630 tx->key = NULL; 631 632 if (tx->key) { 633 bool skip_hw = false; 634 635 /* TODO: add threshold stuff again */ 636 637 switch (tx->key->conf.cipher) { 638 case WLAN_CIPHER_SUITE_WEP40: 639 case WLAN_CIPHER_SUITE_WEP104: 640 case WLAN_CIPHER_SUITE_TKIP: 641 if (!ieee80211_is_data_present(hdr->frame_control)) 642 tx->key = NULL; 643 break; 644 case WLAN_CIPHER_SUITE_CCMP: 645 case WLAN_CIPHER_SUITE_CCMP_256: 646 case WLAN_CIPHER_SUITE_GCMP: 647 case WLAN_CIPHER_SUITE_GCMP_256: 648 if (!ieee80211_is_data_present(hdr->frame_control) && 649 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 650 tx->skb) && 651 !ieee80211_is_group_privacy_action(tx->skb)) 652 tx->key = NULL; 653 else 654 skip_hw = (tx->key->conf.flags & 655 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 656 ieee80211_is_mgmt(hdr->frame_control); 657 break; 658 case WLAN_CIPHER_SUITE_AES_CMAC: 659 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 660 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 661 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 662 if (!ieee80211_is_mgmt(hdr->frame_control)) 663 tx->key = NULL; 664 break; 665 } 666 667 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 668 !ieee80211_is_deauth(hdr->frame_control))) 669 return TX_DROP; 670 671 if (!skip_hw && tx->key && 672 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 673 info->control.hw_key = &tx->key->conf; 674 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 675 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 676 return TX_DROP; 677 } 678 679 return TX_CONTINUE; 680 } 681 682 static ieee80211_tx_result debug_noinline 683 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 684 { 685 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 686 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 687 struct ieee80211_supported_band *sband; 688 u32 len; 689 struct ieee80211_tx_rate_control txrc; 690 struct ieee80211_sta_rates *ratetbl = NULL; 691 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 692 bool assoc = false; 693 694 memset(&txrc, 0, sizeof(txrc)); 695 696 sband = tx->local->hw.wiphy->bands[info->band]; 697 698 len = min_t(u32, tx->skb->len + FCS_LEN, 699 tx->local->hw.wiphy->frag_threshold); 700 701 /* set up the tx rate control struct we give the RC algo */ 702 txrc.hw = &tx->local->hw; 703 txrc.sband = sband; 704 txrc.bss_conf = &tx->sdata->vif.bss_conf; 705 txrc.skb = tx->skb; 706 txrc.reported_rate.idx = -1; 707 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 708 709 if (tx->sdata->rc_has_mcs_mask[info->band]) 710 txrc.rate_idx_mcs_mask = 711 tx->sdata->rc_rateidx_mcs_mask[info->band]; 712 713 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 714 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 715 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 716 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 717 718 /* set up RTS protection if desired */ 719 if (len > tx->local->hw.wiphy->rts_threshold) { 720 txrc.rts = true; 721 } 722 723 info->control.use_rts = txrc.rts; 724 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 725 726 /* 727 * Use short preamble if the BSS can handle it, but not for 728 * management frames unless we know the receiver can handle 729 * that -- the management frame might be to a station that 730 * just wants a probe response. 731 */ 732 if (tx->sdata->vif.bss_conf.use_short_preamble && 733 (ieee80211_is_tx_data(tx->skb) || 734 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 735 txrc.short_preamble = true; 736 737 info->control.short_preamble = txrc.short_preamble; 738 739 /* don't ask rate control when rate already injected via radiotap */ 740 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 741 return TX_CONTINUE; 742 743 if (tx->sta) 744 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 745 746 /* 747 * Lets not bother rate control if we're associated and cannot 748 * talk to the sta. This should not happen. 749 */ 750 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 751 !rate_usable_index_exists(sband, &tx->sta->sta), 752 "%s: Dropped data frame as no usable bitrate found while " 753 "scanning and associated. Target station: " 754 "%pM on %d GHz band\n", 755 tx->sdata->name, 756 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 757 info->band ? 5 : 2)) 758 return TX_DROP; 759 760 /* 761 * If we're associated with the sta at this point we know we can at 762 * least send the frame at the lowest bit rate. 763 */ 764 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 765 766 if (tx->sta && !info->control.skip_table) 767 ratetbl = rcu_dereference(tx->sta->sta.rates); 768 769 if (unlikely(info->control.rates[0].idx < 0)) { 770 if (ratetbl) { 771 struct ieee80211_tx_rate rate = { 772 .idx = ratetbl->rate[0].idx, 773 .flags = ratetbl->rate[0].flags, 774 .count = ratetbl->rate[0].count 775 }; 776 777 if (ratetbl->rate[0].idx < 0) 778 return TX_DROP; 779 780 tx->rate = rate; 781 } else { 782 return TX_DROP; 783 } 784 } else { 785 tx->rate = info->control.rates[0]; 786 } 787 788 if (txrc.reported_rate.idx < 0) { 789 txrc.reported_rate = tx->rate; 790 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 791 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 792 } else if (tx->sta) 793 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 794 795 if (ratetbl) 796 return TX_CONTINUE; 797 798 if (unlikely(!info->control.rates[0].count)) 799 info->control.rates[0].count = 1; 800 801 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 802 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 803 info->control.rates[0].count = 1; 804 805 return TX_CONTINUE; 806 } 807 808 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 809 { 810 u16 *seq = &sta->tid_seq[tid]; 811 __le16 ret = cpu_to_le16(*seq); 812 813 /* Increase the sequence number. */ 814 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 815 816 return ret; 817 } 818 819 static ieee80211_tx_result debug_noinline 820 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 821 { 822 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 823 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 824 int tid; 825 826 /* 827 * Packet injection may want to control the sequence 828 * number, if we have no matching interface then we 829 * neither assign one ourselves nor ask the driver to. 830 */ 831 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 832 return TX_CONTINUE; 833 834 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 835 return TX_CONTINUE; 836 837 if (ieee80211_hdrlen(hdr->frame_control) < 24) 838 return TX_CONTINUE; 839 840 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 841 return TX_CONTINUE; 842 843 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 844 return TX_CONTINUE; 845 846 /* SNS11 from 802.11be 10.3.2.14 */ 847 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 848 ieee80211_vif_is_mld(info->control.vif) && 849 info->control.vif->type == NL80211_IFTYPE_AP)) { 850 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 851 tx->sdata->mld_mcast_seq += 0x10; 852 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 853 return TX_CONTINUE; 854 } 855 856 /* 857 * Anything but QoS data that has a sequence number field 858 * (is long enough) gets a sequence number from the global 859 * counter. QoS data frames with a multicast destination 860 * also use the global counter (802.11-2012 9.3.2.10). 861 */ 862 if (!ieee80211_is_data_qos(hdr->frame_control) || 863 is_multicast_ether_addr(hdr->addr1)) { 864 /* driver should assign sequence number */ 865 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 866 /* for pure STA mode without beacons, we can do it */ 867 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 868 tx->sdata->sequence_number += 0x10; 869 if (tx->sta) 870 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 871 return TX_CONTINUE; 872 } 873 874 /* 875 * This should be true for injected/management frames only, for 876 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 877 * above since they are not QoS-data frames. 878 */ 879 if (!tx->sta) 880 return TX_CONTINUE; 881 882 /* include per-STA, per-TID sequence counter */ 883 tid = ieee80211_get_tid(hdr); 884 tx->sta->deflink.tx_stats.msdu[tid]++; 885 886 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 887 888 return TX_CONTINUE; 889 } 890 891 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 892 struct sk_buff *skb, int hdrlen, 893 int frag_threshold) 894 { 895 struct ieee80211_local *local = tx->local; 896 struct ieee80211_tx_info *info; 897 struct sk_buff *tmp; 898 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 899 int pos = hdrlen + per_fragm; 900 int rem = skb->len - hdrlen - per_fragm; 901 902 if (WARN_ON(rem < 0)) 903 return -EINVAL; 904 905 /* first fragment was already added to queue by caller */ 906 907 while (rem) { 908 int fraglen = per_fragm; 909 910 if (fraglen > rem) 911 fraglen = rem; 912 rem -= fraglen; 913 tmp = dev_alloc_skb(local->tx_headroom + 914 frag_threshold + 915 IEEE80211_ENCRYPT_HEADROOM + 916 IEEE80211_ENCRYPT_TAILROOM); 917 if (!tmp) 918 return -ENOMEM; 919 920 __skb_queue_tail(&tx->skbs, tmp); 921 922 skb_reserve(tmp, 923 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 924 925 /* copy control information */ 926 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 927 928 info = IEEE80211_SKB_CB(tmp); 929 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 930 IEEE80211_TX_CTL_FIRST_FRAGMENT); 931 932 if (rem) 933 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 934 935 skb_copy_queue_mapping(tmp, skb); 936 tmp->priority = skb->priority; 937 tmp->dev = skb->dev; 938 939 /* copy header and data */ 940 skb_put_data(tmp, skb->data, hdrlen); 941 skb_put_data(tmp, skb->data + pos, fraglen); 942 943 pos += fraglen; 944 } 945 946 /* adjust first fragment's length */ 947 skb_trim(skb, hdrlen + per_fragm); 948 return 0; 949 } 950 951 static ieee80211_tx_result debug_noinline 952 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 953 { 954 struct sk_buff *skb = tx->skb; 955 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 956 struct ieee80211_hdr *hdr = (void *)skb->data; 957 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 958 int hdrlen; 959 int fragnum; 960 961 /* no matter what happens, tx->skb moves to tx->skbs */ 962 __skb_queue_tail(&tx->skbs, skb); 963 tx->skb = NULL; 964 965 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 966 return TX_CONTINUE; 967 968 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 969 return TX_CONTINUE; 970 971 /* 972 * Warn when submitting a fragmented A-MPDU frame and drop it. 973 * This scenario is handled in ieee80211_tx_prepare but extra 974 * caution taken here as fragmented ampdu may cause Tx stop. 975 */ 976 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 977 return TX_DROP; 978 979 hdrlen = ieee80211_hdrlen(hdr->frame_control); 980 981 /* internal error, why isn't DONTFRAG set? */ 982 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 983 return TX_DROP; 984 985 /* 986 * Now fragment the frame. This will allocate all the fragments and 987 * chain them (using skb as the first fragment) to skb->next. 988 * During transmission, we will remove the successfully transmitted 989 * fragments from this list. When the low-level driver rejects one 990 * of the fragments then we will simply pretend to accept the skb 991 * but store it away as pending. 992 */ 993 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 994 return TX_DROP; 995 996 /* update duration/seq/flags of fragments */ 997 fragnum = 0; 998 999 skb_queue_walk(&tx->skbs, skb) { 1000 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1001 1002 hdr = (void *)skb->data; 1003 info = IEEE80211_SKB_CB(skb); 1004 1005 if (!skb_queue_is_last(&tx->skbs, skb)) { 1006 hdr->frame_control |= morefrags; 1007 /* 1008 * No multi-rate retries for fragmented frames, that 1009 * would completely throw off the NAV at other STAs. 1010 */ 1011 info->control.rates[1].idx = -1; 1012 info->control.rates[2].idx = -1; 1013 info->control.rates[3].idx = -1; 1014 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1015 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1016 } else { 1017 hdr->frame_control &= ~morefrags; 1018 } 1019 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1020 fragnum++; 1021 } 1022 1023 return TX_CONTINUE; 1024 } 1025 1026 static ieee80211_tx_result debug_noinline 1027 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1028 { 1029 struct sk_buff *skb; 1030 int ac = -1; 1031 1032 if (!tx->sta) 1033 return TX_CONTINUE; 1034 1035 skb_queue_walk(&tx->skbs, skb) { 1036 ac = skb_get_queue_mapping(skb); 1037 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1038 } 1039 if (ac >= 0) 1040 tx->sta->deflink.tx_stats.packets[ac]++; 1041 1042 return TX_CONTINUE; 1043 } 1044 1045 static ieee80211_tx_result debug_noinline 1046 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1047 { 1048 if (!tx->key) 1049 return TX_CONTINUE; 1050 1051 switch (tx->key->conf.cipher) { 1052 case WLAN_CIPHER_SUITE_WEP40: 1053 case WLAN_CIPHER_SUITE_WEP104: 1054 return ieee80211_crypto_wep_encrypt(tx); 1055 case WLAN_CIPHER_SUITE_TKIP: 1056 return ieee80211_crypto_tkip_encrypt(tx); 1057 case WLAN_CIPHER_SUITE_CCMP: 1058 return ieee80211_crypto_ccmp_encrypt( 1059 tx, IEEE80211_CCMP_MIC_LEN); 1060 case WLAN_CIPHER_SUITE_CCMP_256: 1061 return ieee80211_crypto_ccmp_encrypt( 1062 tx, IEEE80211_CCMP_256_MIC_LEN); 1063 case WLAN_CIPHER_SUITE_AES_CMAC: 1064 return ieee80211_crypto_aes_cmac_encrypt(tx); 1065 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1066 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1067 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1068 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1069 return ieee80211_crypto_aes_gmac_encrypt(tx); 1070 case WLAN_CIPHER_SUITE_GCMP: 1071 case WLAN_CIPHER_SUITE_GCMP_256: 1072 return ieee80211_crypto_gcmp_encrypt(tx); 1073 } 1074 1075 return TX_DROP; 1076 } 1077 1078 static ieee80211_tx_result debug_noinline 1079 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1080 { 1081 struct sk_buff *skb; 1082 struct ieee80211_hdr *hdr; 1083 int next_len; 1084 bool group_addr; 1085 1086 skb_queue_walk(&tx->skbs, skb) { 1087 hdr = (void *) skb->data; 1088 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1089 break; /* must not overwrite AID */ 1090 if (!skb_queue_is_last(&tx->skbs, skb)) { 1091 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1092 next_len = next->len; 1093 } else 1094 next_len = 0; 1095 group_addr = is_multicast_ether_addr(hdr->addr1); 1096 1097 hdr->duration_id = 1098 ieee80211_duration(tx, skb, group_addr, next_len); 1099 } 1100 1101 return TX_CONTINUE; 1102 } 1103 1104 /* actual transmit path */ 1105 1106 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1107 struct sk_buff *skb, 1108 struct ieee80211_tx_info *info, 1109 struct tid_ampdu_tx *tid_tx, 1110 int tid) 1111 { 1112 bool queued = false; 1113 bool reset_agg_timer = false; 1114 struct sk_buff *purge_skb = NULL; 1115 1116 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1117 reset_agg_timer = true; 1118 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1119 /* 1120 * nothing -- this aggregation session is being started 1121 * but that might still fail with the driver 1122 */ 1123 } else if (!tx->sta->sta.txq[tid]) { 1124 spin_lock(&tx->sta->lock); 1125 /* 1126 * Need to re-check now, because we may get here 1127 * 1128 * 1) in the window during which the setup is actually 1129 * already done, but not marked yet because not all 1130 * packets are spliced over to the driver pending 1131 * queue yet -- if this happened we acquire the lock 1132 * either before or after the splice happens, but 1133 * need to recheck which of these cases happened. 1134 * 1135 * 2) during session teardown, if the OPERATIONAL bit 1136 * was cleared due to the teardown but the pointer 1137 * hasn't been assigned NULL yet (or we loaded it 1138 * before it was assigned) -- in this case it may 1139 * now be NULL which means we should just let the 1140 * packet pass through because splicing the frames 1141 * back is already done. 1142 */ 1143 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1144 1145 if (!tid_tx) { 1146 /* do nothing, let packet pass through */ 1147 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1148 reset_agg_timer = true; 1149 } else { 1150 queued = true; 1151 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1152 clear_sta_flag(tx->sta, WLAN_STA_SP); 1153 ps_dbg(tx->sta->sdata, 1154 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1155 tx->sta->sta.addr, tx->sta->sta.aid); 1156 } 1157 info->control.vif = &tx->sdata->vif; 1158 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1159 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1160 __skb_queue_tail(&tid_tx->pending, skb); 1161 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1162 purge_skb = __skb_dequeue(&tid_tx->pending); 1163 } 1164 spin_unlock(&tx->sta->lock); 1165 1166 if (purge_skb) 1167 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1168 } 1169 1170 /* reset session timer */ 1171 if (reset_agg_timer) 1172 tid_tx->last_tx = jiffies; 1173 1174 return queued; 1175 } 1176 1177 void ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1178 struct sta_info *sta, struct sk_buff *skb) 1179 { 1180 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1181 u16 tid; 1182 1183 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1184 return; 1185 1186 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1187 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1188 skb->protocol == sdata->control_port_protocol) 1189 return; 1190 1191 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1192 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1193 return; 1194 1195 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1196 } 1197 1198 /* 1199 * initialises @tx 1200 * pass %NULL for the station if unknown, a valid pointer if known 1201 * or an ERR_PTR() if the station is known not to exist 1202 */ 1203 static ieee80211_tx_result 1204 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1205 struct ieee80211_tx_data *tx, 1206 struct sta_info *sta, struct sk_buff *skb) 1207 { 1208 struct ieee80211_local *local = sdata->local; 1209 struct ieee80211_hdr *hdr; 1210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1211 bool aggr_check = false; 1212 int tid; 1213 1214 memset(tx, 0, sizeof(*tx)); 1215 tx->skb = skb; 1216 tx->local = local; 1217 tx->sdata = sdata; 1218 __skb_queue_head_init(&tx->skbs); 1219 1220 /* 1221 * If this flag is set to true anywhere, and we get here, 1222 * we are doing the needed processing, so remove the flag 1223 * now. 1224 */ 1225 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1226 1227 hdr = (struct ieee80211_hdr *) skb->data; 1228 1229 if (likely(sta)) { 1230 if (!IS_ERR(sta)) 1231 tx->sta = sta; 1232 } else { 1233 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1234 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1235 if (!tx->sta && sdata->wdev.use_4addr) 1236 return TX_DROP; 1237 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1238 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1239 } 1240 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1241 tx->sta = sta_info_get(sdata, hdr->addr1); 1242 aggr_check = true; 1243 } 1244 } 1245 1246 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1247 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1248 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1249 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1250 struct tid_ampdu_tx *tid_tx; 1251 1252 tid = ieee80211_get_tid(hdr); 1253 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1254 if (!tid_tx && aggr_check) { 1255 ieee80211_aggr_check(sdata, tx->sta, skb); 1256 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1257 } 1258 1259 if (tid_tx) { 1260 bool queued; 1261 1262 queued = ieee80211_tx_prep_agg(tx, skb, info, 1263 tid_tx, tid); 1264 1265 if (unlikely(queued)) 1266 return TX_QUEUED; 1267 } 1268 } 1269 1270 if (is_multicast_ether_addr(hdr->addr1)) { 1271 tx->flags &= ~IEEE80211_TX_UNICAST; 1272 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1273 } else 1274 tx->flags |= IEEE80211_TX_UNICAST; 1275 1276 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1277 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1278 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1279 info->flags & IEEE80211_TX_CTL_AMPDU) 1280 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1281 } 1282 1283 if (!tx->sta) 1284 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1285 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1286 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1287 ieee80211_check_fast_xmit(tx->sta); 1288 } 1289 1290 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1291 1292 return TX_CONTINUE; 1293 } 1294 1295 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1296 struct ieee80211_vif *vif, 1297 struct sta_info *sta, 1298 struct sk_buff *skb) 1299 { 1300 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1301 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1302 struct ieee80211_txq *txq = NULL; 1303 1304 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1305 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1306 return NULL; 1307 1308 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1309 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1310 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1311 ieee80211_is_bufferable_mmpdu(skb) || 1312 vif->type == NL80211_IFTYPE_STATION) && 1313 sta && sta->uploaded) { 1314 /* 1315 * This will be NULL if the driver didn't set the 1316 * opt-in hardware flag. 1317 */ 1318 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1319 } 1320 } else if (sta) { 1321 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1322 1323 if (!sta->uploaded) 1324 return NULL; 1325 1326 txq = sta->sta.txq[tid]; 1327 } else { 1328 txq = vif->txq; 1329 } 1330 1331 if (!txq) 1332 return NULL; 1333 1334 return to_txq_info(txq); 1335 } 1336 1337 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1338 { 1339 struct sk_buff *next; 1340 codel_time_t now = codel_get_time(); 1341 1342 skb_list_walk_safe(skb, skb, next) 1343 IEEE80211_SKB_CB(skb)->control.enqueue_time = now; 1344 } 1345 1346 static u32 codel_skb_len_func(const struct sk_buff *skb) 1347 { 1348 return skb->len; 1349 } 1350 1351 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1352 { 1353 const struct ieee80211_tx_info *info; 1354 1355 info = (const struct ieee80211_tx_info *)skb->cb; 1356 return info->control.enqueue_time; 1357 } 1358 1359 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1360 void *ctx) 1361 { 1362 struct ieee80211_local *local; 1363 struct txq_info *txqi; 1364 struct fq *fq; 1365 struct fq_flow *flow; 1366 1367 txqi = ctx; 1368 local = vif_to_sdata(txqi->txq.vif)->local; 1369 fq = &local->fq; 1370 1371 if (cvars == &txqi->def_cvars) 1372 flow = &txqi->tin.default_flow; 1373 else 1374 flow = &fq->flows[cvars - local->cvars]; 1375 1376 return fq_flow_dequeue(fq, flow); 1377 } 1378 1379 static void codel_drop_func(struct sk_buff *skb, 1380 void *ctx) 1381 { 1382 struct ieee80211_local *local; 1383 struct ieee80211_hw *hw; 1384 struct txq_info *txqi; 1385 1386 txqi = ctx; 1387 local = vif_to_sdata(txqi->txq.vif)->local; 1388 hw = &local->hw; 1389 1390 ieee80211_free_txskb(hw, skb); 1391 } 1392 1393 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1394 struct fq_tin *tin, 1395 struct fq_flow *flow) 1396 { 1397 struct ieee80211_local *local; 1398 struct txq_info *txqi; 1399 struct codel_vars *cvars; 1400 struct codel_params *cparams; 1401 struct codel_stats *cstats; 1402 1403 local = container_of(fq, struct ieee80211_local, fq); 1404 txqi = container_of(tin, struct txq_info, tin); 1405 cstats = &txqi->cstats; 1406 1407 if (txqi->txq.sta) { 1408 struct sta_info *sta = container_of(txqi->txq.sta, 1409 struct sta_info, sta); 1410 cparams = &sta->cparams; 1411 } else { 1412 cparams = &local->cparams; 1413 } 1414 1415 if (flow == &tin->default_flow) 1416 cvars = &txqi->def_cvars; 1417 else 1418 cvars = &local->cvars[flow - fq->flows]; 1419 1420 return codel_dequeue(txqi, 1421 &flow->backlog, 1422 cparams, 1423 cvars, 1424 cstats, 1425 codel_skb_len_func, 1426 codel_skb_time_func, 1427 codel_drop_func, 1428 codel_dequeue_func); 1429 } 1430 1431 static void fq_skb_free_func(struct fq *fq, 1432 struct fq_tin *tin, 1433 struct fq_flow *flow, 1434 struct sk_buff *skb) 1435 { 1436 struct ieee80211_local *local; 1437 1438 local = container_of(fq, struct ieee80211_local, fq); 1439 ieee80211_free_txskb(&local->hw, skb); 1440 } 1441 1442 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1443 struct txq_info *txqi, 1444 struct sk_buff *skb) 1445 { 1446 struct fq *fq = &local->fq; 1447 struct fq_tin *tin = &txqi->tin; 1448 u32 flow_idx = fq_flow_idx(fq, skb); 1449 1450 ieee80211_set_skb_enqueue_time(skb); 1451 1452 spin_lock_bh(&fq->lock); 1453 /* 1454 * For management frames, don't really apply codel etc., 1455 * we don't want to apply any shaping or anything we just 1456 * want to simplify the driver API by having them on the 1457 * txqi. 1458 */ 1459 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1460 IEEE80211_SKB_CB(skb)->control.flags |= 1461 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1462 __skb_queue_tail(&txqi->frags, skb); 1463 } else { 1464 fq_tin_enqueue(fq, tin, flow_idx, skb, 1465 fq_skb_free_func); 1466 } 1467 spin_unlock_bh(&fq->lock); 1468 } 1469 1470 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1471 struct fq_flow *flow, struct sk_buff *skb, 1472 void *data) 1473 { 1474 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1475 1476 return info->control.vif == data; 1477 } 1478 1479 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1480 struct ieee80211_sub_if_data *sdata) 1481 { 1482 struct fq *fq = &local->fq; 1483 struct txq_info *txqi; 1484 struct fq_tin *tin; 1485 struct ieee80211_sub_if_data *ap; 1486 1487 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1488 return; 1489 1490 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1491 1492 if (!ap->vif.txq) 1493 return; 1494 1495 txqi = to_txq_info(ap->vif.txq); 1496 tin = &txqi->tin; 1497 1498 spin_lock_bh(&fq->lock); 1499 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1500 fq_skb_free_func); 1501 spin_unlock_bh(&fq->lock); 1502 } 1503 1504 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1505 struct sta_info *sta, 1506 struct txq_info *txqi, int tid) 1507 { 1508 fq_tin_init(&txqi->tin); 1509 codel_vars_init(&txqi->def_cvars); 1510 codel_stats_init(&txqi->cstats); 1511 __skb_queue_head_init(&txqi->frags); 1512 INIT_LIST_HEAD(&txqi->schedule_order); 1513 1514 txqi->txq.vif = &sdata->vif; 1515 1516 if (!sta) { 1517 sdata->vif.txq = &txqi->txq; 1518 txqi->txq.tid = 0; 1519 txqi->txq.ac = IEEE80211_AC_BE; 1520 1521 return; 1522 } 1523 1524 if (tid == IEEE80211_NUM_TIDS) { 1525 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1526 /* Drivers need to opt in to the management MPDU TXQ */ 1527 if (!ieee80211_hw_check(&sdata->local->hw, 1528 STA_MMPDU_TXQ)) 1529 return; 1530 } else if (!ieee80211_hw_check(&sdata->local->hw, 1531 BUFF_MMPDU_TXQ)) { 1532 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1533 return; 1534 } 1535 txqi->txq.ac = IEEE80211_AC_VO; 1536 } else { 1537 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1538 } 1539 1540 txqi->txq.sta = &sta->sta; 1541 txqi->txq.tid = tid; 1542 sta->sta.txq[tid] = &txqi->txq; 1543 } 1544 1545 void ieee80211_txq_purge(struct ieee80211_local *local, 1546 struct txq_info *txqi) 1547 { 1548 struct fq *fq = &local->fq; 1549 struct fq_tin *tin = &txqi->tin; 1550 1551 spin_lock_bh(&fq->lock); 1552 fq_tin_reset(fq, tin, fq_skb_free_func); 1553 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1554 spin_unlock_bh(&fq->lock); 1555 1556 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1557 list_del_init(&txqi->schedule_order); 1558 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1559 } 1560 1561 void ieee80211_txq_set_params(struct ieee80211_local *local) 1562 { 1563 if (local->hw.wiphy->txq_limit) 1564 local->fq.limit = local->hw.wiphy->txq_limit; 1565 else 1566 local->hw.wiphy->txq_limit = local->fq.limit; 1567 1568 if (local->hw.wiphy->txq_memory_limit) 1569 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1570 else 1571 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1572 1573 if (local->hw.wiphy->txq_quantum) 1574 local->fq.quantum = local->hw.wiphy->txq_quantum; 1575 else 1576 local->hw.wiphy->txq_quantum = local->fq.quantum; 1577 } 1578 1579 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1580 { 1581 struct fq *fq = &local->fq; 1582 int ret; 1583 int i; 1584 bool supp_vht = false; 1585 enum nl80211_band band; 1586 1587 ret = fq_init(fq, 4096); 1588 if (ret) 1589 return ret; 1590 1591 /* 1592 * If the hardware doesn't support VHT, it is safe to limit the maximum 1593 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1594 */ 1595 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1596 struct ieee80211_supported_band *sband; 1597 1598 sband = local->hw.wiphy->bands[band]; 1599 if (!sband) 1600 continue; 1601 1602 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1603 } 1604 1605 if (!supp_vht) 1606 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1607 1608 codel_params_init(&local->cparams); 1609 local->cparams.interval = MS2TIME(100); 1610 local->cparams.target = MS2TIME(20); 1611 local->cparams.ecn = true; 1612 1613 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1614 GFP_KERNEL); 1615 if (!local->cvars) { 1616 spin_lock_bh(&fq->lock); 1617 fq_reset(fq, fq_skb_free_func); 1618 spin_unlock_bh(&fq->lock); 1619 return -ENOMEM; 1620 } 1621 1622 for (i = 0; i < fq->flows_cnt; i++) 1623 codel_vars_init(&local->cvars[i]); 1624 1625 ieee80211_txq_set_params(local); 1626 1627 return 0; 1628 } 1629 1630 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1631 { 1632 struct fq *fq = &local->fq; 1633 1634 kfree(local->cvars); 1635 local->cvars = NULL; 1636 1637 spin_lock_bh(&fq->lock); 1638 fq_reset(fq, fq_skb_free_func); 1639 spin_unlock_bh(&fq->lock); 1640 } 1641 1642 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1643 struct ieee80211_sub_if_data *sdata, 1644 struct sta_info *sta, 1645 struct sk_buff *skb) 1646 { 1647 struct ieee80211_vif *vif; 1648 struct txq_info *txqi; 1649 1650 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) 1651 return false; 1652 1653 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1654 sdata = container_of(sdata->bss, 1655 struct ieee80211_sub_if_data, u.ap); 1656 1657 vif = &sdata->vif; 1658 txqi = ieee80211_get_txq(local, vif, sta, skb); 1659 1660 if (!txqi) 1661 return false; 1662 1663 ieee80211_txq_enqueue(local, txqi, skb); 1664 1665 schedule_and_wake_txq(local, txqi); 1666 1667 return true; 1668 } 1669 1670 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1671 struct ieee80211_vif *vif, 1672 struct sta_info *sta, 1673 struct sk_buff_head *skbs, 1674 bool txpending) 1675 { 1676 struct ieee80211_tx_control control = {}; 1677 struct sk_buff *skb, *tmp; 1678 unsigned long flags; 1679 1680 skb_queue_walk_safe(skbs, skb, tmp) { 1681 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1682 int q = info->hw_queue; 1683 1684 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1685 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1686 __skb_unlink(skb, skbs); 1687 ieee80211_free_txskb(&local->hw, skb); 1688 continue; 1689 } 1690 #endif 1691 1692 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1693 if (local->queue_stop_reasons[q] || 1694 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1695 if (unlikely(info->flags & 1696 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1697 if (local->queue_stop_reasons[q] & 1698 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1699 /* 1700 * Drop off-channel frames if queues 1701 * are stopped for any reason other 1702 * than off-channel operation. Never 1703 * queue them. 1704 */ 1705 spin_unlock_irqrestore( 1706 &local->queue_stop_reason_lock, 1707 flags); 1708 ieee80211_purge_tx_queue(&local->hw, 1709 skbs); 1710 return true; 1711 } 1712 } else { 1713 1714 /* 1715 * Since queue is stopped, queue up frames for 1716 * later transmission from the tx-pending 1717 * tasklet when the queue is woken again. 1718 */ 1719 if (txpending) 1720 skb_queue_splice_init(skbs, 1721 &local->pending[q]); 1722 else 1723 skb_queue_splice_tail_init(skbs, 1724 &local->pending[q]); 1725 1726 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1727 flags); 1728 return false; 1729 } 1730 } 1731 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1732 1733 info->control.vif = vif; 1734 control.sta = sta ? &sta->sta : NULL; 1735 1736 __skb_unlink(skb, skbs); 1737 drv_tx(local, &control, skb); 1738 } 1739 1740 return true; 1741 } 1742 1743 /* 1744 * Returns false if the frame couldn't be transmitted but was queued instead. 1745 */ 1746 static bool __ieee80211_tx(struct ieee80211_local *local, 1747 struct sk_buff_head *skbs, struct sta_info *sta, 1748 bool txpending) 1749 { 1750 struct ieee80211_tx_info *info; 1751 struct ieee80211_sub_if_data *sdata; 1752 struct ieee80211_vif *vif; 1753 struct sk_buff *skb; 1754 bool result; 1755 1756 if (WARN_ON(skb_queue_empty(skbs))) 1757 return true; 1758 1759 skb = skb_peek(skbs); 1760 info = IEEE80211_SKB_CB(skb); 1761 sdata = vif_to_sdata(info->control.vif); 1762 if (sta && !sta->uploaded) 1763 sta = NULL; 1764 1765 switch (sdata->vif.type) { 1766 case NL80211_IFTYPE_MONITOR: 1767 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1768 vif = &sdata->vif; 1769 break; 1770 } 1771 sdata = rcu_dereference(local->monitor_sdata); 1772 if (sdata) { 1773 vif = &sdata->vif; 1774 info->hw_queue = 1775 vif->hw_queue[skb_get_queue_mapping(skb)]; 1776 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1777 ieee80211_purge_tx_queue(&local->hw, skbs); 1778 return true; 1779 } else 1780 vif = NULL; 1781 break; 1782 case NL80211_IFTYPE_AP_VLAN: 1783 sdata = container_of(sdata->bss, 1784 struct ieee80211_sub_if_data, u.ap); 1785 fallthrough; 1786 default: 1787 vif = &sdata->vif; 1788 break; 1789 } 1790 1791 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1792 1793 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1794 1795 return result; 1796 } 1797 1798 /* 1799 * Invoke TX handlers, return 0 on success and non-zero if the 1800 * frame was dropped or queued. 1801 * 1802 * The handlers are split into an early and late part. The latter is everything 1803 * that can be sensitive to reordering, and will be deferred to after packets 1804 * are dequeued from the intermediate queues (when they are enabled). 1805 */ 1806 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1807 { 1808 ieee80211_tx_result res = TX_DROP; 1809 1810 #define CALL_TXH(txh) \ 1811 do { \ 1812 res = txh(tx); \ 1813 if (res != TX_CONTINUE) \ 1814 goto txh_done; \ 1815 } while (0) 1816 1817 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1818 CALL_TXH(ieee80211_tx_h_check_assoc); 1819 CALL_TXH(ieee80211_tx_h_ps_buf); 1820 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1821 CALL_TXH(ieee80211_tx_h_select_key); 1822 1823 txh_done: 1824 if (unlikely(res == TX_DROP)) { 1825 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1826 if (tx->skb) 1827 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1828 else 1829 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1830 return -1; 1831 } else if (unlikely(res == TX_QUEUED)) { 1832 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1833 return -1; 1834 } 1835 1836 return 0; 1837 } 1838 1839 /* 1840 * Late handlers can be called while the sta lock is held. Handlers that can 1841 * cause packets to be generated will cause deadlock! 1842 */ 1843 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1844 { 1845 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1846 ieee80211_tx_result res = TX_CONTINUE; 1847 1848 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1849 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1850 1851 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1852 __skb_queue_tail(&tx->skbs, tx->skb); 1853 tx->skb = NULL; 1854 goto txh_done; 1855 } 1856 1857 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1858 CALL_TXH(ieee80211_tx_h_sequence); 1859 CALL_TXH(ieee80211_tx_h_fragment); 1860 /* handlers after fragment must be aware of tx info fragmentation! */ 1861 CALL_TXH(ieee80211_tx_h_stats); 1862 CALL_TXH(ieee80211_tx_h_encrypt); 1863 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1864 CALL_TXH(ieee80211_tx_h_calculate_duration); 1865 #undef CALL_TXH 1866 1867 txh_done: 1868 if (unlikely(res == TX_DROP)) { 1869 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1870 if (tx->skb) 1871 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1872 else 1873 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1874 return -1; 1875 } else if (unlikely(res == TX_QUEUED)) { 1876 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1877 return -1; 1878 } 1879 1880 return 0; 1881 } 1882 1883 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1884 { 1885 int r = invoke_tx_handlers_early(tx); 1886 1887 if (r) 1888 return r; 1889 return invoke_tx_handlers_late(tx); 1890 } 1891 1892 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1893 struct ieee80211_vif *vif, struct sk_buff *skb, 1894 int band, struct ieee80211_sta **sta) 1895 { 1896 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1897 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1898 struct ieee80211_tx_data tx; 1899 struct sk_buff *skb2; 1900 1901 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1902 return false; 1903 1904 info->band = band; 1905 info->control.vif = vif; 1906 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1907 1908 if (invoke_tx_handlers(&tx)) 1909 return false; 1910 1911 if (sta) { 1912 if (tx.sta) 1913 *sta = &tx.sta->sta; 1914 else 1915 *sta = NULL; 1916 } 1917 1918 /* this function isn't suitable for fragmented data frames */ 1919 skb2 = __skb_dequeue(&tx.skbs); 1920 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1921 ieee80211_free_txskb(hw, skb2); 1922 ieee80211_purge_tx_queue(hw, &tx.skbs); 1923 return false; 1924 } 1925 1926 return true; 1927 } 1928 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1929 1930 /* 1931 * Returns false if the frame couldn't be transmitted but was queued instead. 1932 */ 1933 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1934 struct sta_info *sta, struct sk_buff *skb, 1935 bool txpending) 1936 { 1937 struct ieee80211_local *local = sdata->local; 1938 struct ieee80211_tx_data tx; 1939 ieee80211_tx_result res_prepare; 1940 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1941 bool result = true; 1942 1943 if (unlikely(skb->len < 10)) { 1944 dev_kfree_skb(skb); 1945 return true; 1946 } 1947 1948 /* initialises tx */ 1949 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1950 1951 if (unlikely(res_prepare == TX_DROP)) { 1952 ieee80211_free_txskb(&local->hw, skb); 1953 return true; 1954 } else if (unlikely(res_prepare == TX_QUEUED)) { 1955 return true; 1956 } 1957 1958 /* set up hw_queue value early */ 1959 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1960 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1961 info->hw_queue = 1962 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1963 1964 if (invoke_tx_handlers_early(&tx)) 1965 return true; 1966 1967 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1968 return true; 1969 1970 if (!invoke_tx_handlers_late(&tx)) 1971 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1972 1973 return result; 1974 } 1975 1976 /* device xmit handlers */ 1977 1978 enum ieee80211_encrypt { 1979 ENCRYPT_NO, 1980 ENCRYPT_MGMT, 1981 ENCRYPT_DATA, 1982 }; 1983 1984 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1985 struct sk_buff *skb, 1986 int head_need, 1987 enum ieee80211_encrypt encrypt) 1988 { 1989 struct ieee80211_local *local = sdata->local; 1990 bool enc_tailroom; 1991 int tail_need = 0; 1992 1993 enc_tailroom = encrypt == ENCRYPT_MGMT || 1994 (encrypt == ENCRYPT_DATA && 1995 sdata->crypto_tx_tailroom_needed_cnt); 1996 1997 if (enc_tailroom) { 1998 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1999 tail_need -= skb_tailroom(skb); 2000 tail_need = max_t(int, tail_need, 0); 2001 } 2002 2003 if (skb_cloned(skb) && 2004 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2005 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2006 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2007 else if (head_need || tail_need) 2008 I802_DEBUG_INC(local->tx_expand_skb_head); 2009 else 2010 return 0; 2011 2012 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2013 wiphy_debug(local->hw.wiphy, 2014 "failed to reallocate TX buffer\n"); 2015 return -ENOMEM; 2016 } 2017 2018 return 0; 2019 } 2020 2021 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2022 struct sta_info *sta, struct sk_buff *skb) 2023 { 2024 struct ieee80211_local *local = sdata->local; 2025 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2026 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2027 int headroom; 2028 enum ieee80211_encrypt encrypt; 2029 2030 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2031 encrypt = ENCRYPT_NO; 2032 else if (ieee80211_is_mgmt(hdr->frame_control)) 2033 encrypt = ENCRYPT_MGMT; 2034 else 2035 encrypt = ENCRYPT_DATA; 2036 2037 headroom = local->tx_headroom; 2038 if (encrypt != ENCRYPT_NO) 2039 headroom += IEEE80211_ENCRYPT_HEADROOM; 2040 headroom -= skb_headroom(skb); 2041 headroom = max_t(int, 0, headroom); 2042 2043 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2044 ieee80211_free_txskb(&local->hw, skb); 2045 return; 2046 } 2047 2048 /* reload after potential resize */ 2049 hdr = (struct ieee80211_hdr *) skb->data; 2050 info->control.vif = &sdata->vif; 2051 2052 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2053 if (ieee80211_is_data(hdr->frame_control) && 2054 is_unicast_ether_addr(hdr->addr1)) { 2055 if (mesh_nexthop_resolve(sdata, skb)) 2056 return; /* skb queued: don't free */ 2057 } else { 2058 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2059 } 2060 } 2061 2062 ieee80211_set_qos_hdr(sdata, skb); 2063 ieee80211_tx(sdata, sta, skb, false); 2064 } 2065 2066 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2067 { 2068 struct ieee80211_radiotap_header *rthdr = 2069 (struct ieee80211_radiotap_header *)skb->data; 2070 2071 /* check for not even having the fixed radiotap header part */ 2072 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2073 return false; /* too short to be possibly valid */ 2074 2075 /* is it a header version we can trust to find length from? */ 2076 if (unlikely(rthdr->it_version)) 2077 return false; /* only version 0 is supported */ 2078 2079 /* does the skb contain enough to deliver on the alleged length? */ 2080 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2081 return false; /* skb too short for claimed rt header extent */ 2082 2083 return true; 2084 } 2085 2086 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2087 struct net_device *dev) 2088 { 2089 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2090 struct ieee80211_radiotap_iterator iterator; 2091 struct ieee80211_radiotap_header *rthdr = 2092 (struct ieee80211_radiotap_header *) skb->data; 2093 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2094 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2095 NULL); 2096 u16 txflags; 2097 u16 rate = 0; 2098 bool rate_found = false; 2099 u8 rate_retries = 0; 2100 u16 rate_flags = 0; 2101 u8 mcs_known, mcs_flags, mcs_bw; 2102 u16 vht_known; 2103 u8 vht_mcs = 0, vht_nss = 0; 2104 int i; 2105 2106 if (!ieee80211_validate_radiotap_len(skb)) 2107 return false; 2108 2109 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2110 IEEE80211_TX_CTL_DONTFRAG; 2111 2112 /* 2113 * for every radiotap entry that is present 2114 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2115 * entries present, or -EINVAL on error) 2116 */ 2117 2118 while (!ret) { 2119 ret = ieee80211_radiotap_iterator_next(&iterator); 2120 2121 if (ret) 2122 continue; 2123 2124 /* see if this argument is something we can use */ 2125 switch (iterator.this_arg_index) { 2126 /* 2127 * You must take care when dereferencing iterator.this_arg 2128 * for multibyte types... the pointer is not aligned. Use 2129 * get_unaligned((type *)iterator.this_arg) to dereference 2130 * iterator.this_arg for type "type" safely on all arches. 2131 */ 2132 case IEEE80211_RADIOTAP_FLAGS: 2133 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2134 /* 2135 * this indicates that the skb we have been 2136 * handed has the 32-bit FCS CRC at the end... 2137 * we should react to that by snipping it off 2138 * because it will be recomputed and added 2139 * on transmission 2140 */ 2141 if (skb->len < (iterator._max_length + FCS_LEN)) 2142 return false; 2143 2144 skb_trim(skb, skb->len - FCS_LEN); 2145 } 2146 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2147 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2148 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2149 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2150 break; 2151 2152 case IEEE80211_RADIOTAP_TX_FLAGS: 2153 txflags = get_unaligned_le16(iterator.this_arg); 2154 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2155 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2156 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2157 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2158 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2159 info->control.flags |= 2160 IEEE80211_TX_CTRL_DONT_REORDER; 2161 break; 2162 2163 case IEEE80211_RADIOTAP_RATE: 2164 rate = *iterator.this_arg; 2165 rate_flags = 0; 2166 rate_found = true; 2167 break; 2168 2169 case IEEE80211_RADIOTAP_DATA_RETRIES: 2170 rate_retries = *iterator.this_arg; 2171 break; 2172 2173 case IEEE80211_RADIOTAP_MCS: 2174 mcs_known = iterator.this_arg[0]; 2175 mcs_flags = iterator.this_arg[1]; 2176 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2177 break; 2178 2179 rate_found = true; 2180 rate = iterator.this_arg[2]; 2181 rate_flags = IEEE80211_TX_RC_MCS; 2182 2183 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2184 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2185 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2186 2187 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2188 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2189 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2190 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2191 2192 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2193 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2194 info->flags |= IEEE80211_TX_CTL_LDPC; 2195 2196 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2197 u8 stbc = u8_get_bits(mcs_flags, 2198 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2199 2200 info->flags |= 2201 u32_encode_bits(stbc, 2202 IEEE80211_TX_CTL_STBC); 2203 } 2204 break; 2205 2206 case IEEE80211_RADIOTAP_VHT: 2207 vht_known = get_unaligned_le16(iterator.this_arg); 2208 rate_found = true; 2209 2210 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2211 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2212 (iterator.this_arg[2] & 2213 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2214 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2215 if (vht_known & 2216 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2217 if (iterator.this_arg[3] == 1) 2218 rate_flags |= 2219 IEEE80211_TX_RC_40_MHZ_WIDTH; 2220 else if (iterator.this_arg[3] == 4) 2221 rate_flags |= 2222 IEEE80211_TX_RC_80_MHZ_WIDTH; 2223 else if (iterator.this_arg[3] == 11) 2224 rate_flags |= 2225 IEEE80211_TX_RC_160_MHZ_WIDTH; 2226 } 2227 2228 vht_mcs = iterator.this_arg[4] >> 4; 2229 if (vht_mcs > 11) 2230 vht_mcs = 0; 2231 vht_nss = iterator.this_arg[4] & 0xF; 2232 if (!vht_nss || vht_nss > 8) 2233 vht_nss = 1; 2234 break; 2235 2236 /* 2237 * Please update the file 2238 * Documentation/networking/mac80211-injection.rst 2239 * when parsing new fields here. 2240 */ 2241 2242 default: 2243 break; 2244 } 2245 } 2246 2247 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2248 return false; 2249 2250 if (rate_found) { 2251 struct ieee80211_supported_band *sband = 2252 local->hw.wiphy->bands[info->band]; 2253 2254 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2255 2256 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2257 info->control.rates[i].idx = -1; 2258 info->control.rates[i].flags = 0; 2259 info->control.rates[i].count = 0; 2260 } 2261 2262 if (rate_flags & IEEE80211_TX_RC_MCS) { 2263 info->control.rates[0].idx = rate; 2264 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2265 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2266 vht_nss); 2267 } else if (sband) { 2268 for (i = 0; i < sband->n_bitrates; i++) { 2269 if (rate * 5 != sband->bitrates[i].bitrate) 2270 continue; 2271 2272 info->control.rates[0].idx = i; 2273 break; 2274 } 2275 } 2276 2277 if (info->control.rates[0].idx < 0) 2278 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2279 2280 info->control.rates[0].flags = rate_flags; 2281 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2282 local->hw.max_rate_tries); 2283 } 2284 2285 return true; 2286 } 2287 2288 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2289 struct net_device *dev) 2290 { 2291 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2292 struct ieee80211_chanctx_conf *chanctx_conf; 2293 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2294 struct ieee80211_hdr *hdr; 2295 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2296 struct cfg80211_chan_def *chandef; 2297 u16 len_rthdr; 2298 int hdrlen; 2299 2300 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2301 if (unlikely(!ieee80211_sdata_running(sdata))) 2302 goto fail; 2303 2304 memset(info, 0, sizeof(*info)); 2305 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2306 IEEE80211_TX_CTL_INJECTED; 2307 2308 /* Sanity-check the length of the radiotap header */ 2309 if (!ieee80211_validate_radiotap_len(skb)) 2310 goto fail; 2311 2312 /* we now know there is a radiotap header with a length we can use */ 2313 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2314 2315 /* 2316 * fix up the pointers accounting for the radiotap 2317 * header still being in there. We are being given 2318 * a precooked IEEE80211 header so no need for 2319 * normal processing 2320 */ 2321 skb_set_mac_header(skb, len_rthdr); 2322 /* 2323 * these are just fixed to the end of the rt area since we 2324 * don't have any better information and at this point, nobody cares 2325 */ 2326 skb_set_network_header(skb, len_rthdr); 2327 skb_set_transport_header(skb, len_rthdr); 2328 2329 if (skb->len < len_rthdr + 2) 2330 goto fail; 2331 2332 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2333 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2334 2335 if (skb->len < len_rthdr + hdrlen) 2336 goto fail; 2337 2338 /* 2339 * Initialize skb->protocol if the injected frame is a data frame 2340 * carrying a rfc1042 header 2341 */ 2342 if (ieee80211_is_data(hdr->frame_control) && 2343 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2344 u8 *payload = (u8 *)hdr + hdrlen; 2345 2346 if (ether_addr_equal(payload, rfc1042_header)) 2347 skb->protocol = cpu_to_be16((payload[6] << 8) | 2348 payload[7]); 2349 } 2350 2351 rcu_read_lock(); 2352 2353 /* 2354 * We process outgoing injected frames that have a local address 2355 * we handle as though they are non-injected frames. 2356 * This code here isn't entirely correct, the local MAC address 2357 * isn't always enough to find the interface to use; for proper 2358 * VLAN support we have an nl80211-based mechanism. 2359 * 2360 * This is necessary, for example, for old hostapd versions that 2361 * don't use nl80211-based management TX/RX. 2362 */ 2363 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2364 if (!ieee80211_sdata_running(tmp_sdata)) 2365 continue; 2366 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2367 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2368 continue; 2369 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2370 sdata = tmp_sdata; 2371 break; 2372 } 2373 } 2374 2375 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2376 if (!chanctx_conf) { 2377 tmp_sdata = rcu_dereference(local->monitor_sdata); 2378 if (tmp_sdata) 2379 chanctx_conf = 2380 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2381 } 2382 2383 if (chanctx_conf) 2384 chandef = &chanctx_conf->def; 2385 else if (!local->use_chanctx) 2386 chandef = &local->_oper_chandef; 2387 else 2388 goto fail_rcu; 2389 2390 /* 2391 * Frame injection is not allowed if beaconing is not allowed 2392 * or if we need radar detection. Beaconing is usually not allowed when 2393 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2394 * Passive scan is also used in world regulatory domains where 2395 * your country is not known and as such it should be treated as 2396 * NO TX unless the channel is explicitly allowed in which case 2397 * your current regulatory domain would not have the passive scan 2398 * flag. 2399 * 2400 * Since AP mode uses monitor interfaces to inject/TX management 2401 * frames we can make AP mode the exception to this rule once it 2402 * supports radar detection as its implementation can deal with 2403 * radar detection by itself. We can do that later by adding a 2404 * monitor flag interfaces used for AP support. 2405 */ 2406 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2407 sdata->vif.type)) 2408 goto fail_rcu; 2409 2410 info->band = chandef->chan->band; 2411 2412 /* Initialize skb->priority according to frame type and TID class, 2413 * with respect to the sub interface that the frame will actually 2414 * be transmitted on. If the DONT_REORDER flag is set, the original 2415 * skb-priority is preserved to assure frames injected with this 2416 * flag are not reordered relative to each other. 2417 */ 2418 ieee80211_select_queue_80211(sdata, skb, hdr); 2419 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2420 2421 /* 2422 * Process the radiotap header. This will now take into account the 2423 * selected chandef above to accurately set injection rates and 2424 * retransmissions. 2425 */ 2426 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2427 goto fail_rcu; 2428 2429 /* remove the injection radiotap header */ 2430 skb_pull(skb, len_rthdr); 2431 2432 ieee80211_xmit(sdata, NULL, skb); 2433 rcu_read_unlock(); 2434 2435 return NETDEV_TX_OK; 2436 2437 fail_rcu: 2438 rcu_read_unlock(); 2439 fail: 2440 dev_kfree_skb(skb); 2441 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2442 } 2443 2444 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2445 { 2446 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2447 2448 return ethertype == ETH_P_TDLS && 2449 skb->len > 14 && 2450 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2451 } 2452 2453 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2454 struct sk_buff *skb, 2455 struct sta_info **sta_out) 2456 { 2457 struct sta_info *sta; 2458 2459 switch (sdata->vif.type) { 2460 case NL80211_IFTYPE_AP_VLAN: 2461 sta = rcu_dereference(sdata->u.vlan.sta); 2462 if (sta) { 2463 *sta_out = sta; 2464 return 0; 2465 } else if (sdata->wdev.use_4addr) { 2466 return -ENOLINK; 2467 } 2468 fallthrough; 2469 case NL80211_IFTYPE_AP: 2470 case NL80211_IFTYPE_OCB: 2471 case NL80211_IFTYPE_ADHOC: 2472 if (is_multicast_ether_addr(skb->data)) { 2473 *sta_out = ERR_PTR(-ENOENT); 2474 return 0; 2475 } 2476 sta = sta_info_get_bss(sdata, skb->data); 2477 break; 2478 #ifdef CONFIG_MAC80211_MESH 2479 case NL80211_IFTYPE_MESH_POINT: 2480 /* determined much later */ 2481 *sta_out = NULL; 2482 return 0; 2483 #endif 2484 case NL80211_IFTYPE_STATION: 2485 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2486 sta = sta_info_get(sdata, skb->data); 2487 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2488 if (test_sta_flag(sta, 2489 WLAN_STA_TDLS_PEER_AUTH)) { 2490 *sta_out = sta; 2491 return 0; 2492 } 2493 2494 /* 2495 * TDLS link during setup - throw out frames to 2496 * peer. Allow TDLS-setup frames to unauthorized 2497 * peers for the special case of a link teardown 2498 * after a TDLS sta is removed due to being 2499 * unreachable. 2500 */ 2501 if (!ieee80211_is_tdls_setup(skb)) 2502 return -EINVAL; 2503 } 2504 2505 } 2506 2507 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2508 if (!sta) 2509 return -ENOLINK; 2510 break; 2511 default: 2512 return -EINVAL; 2513 } 2514 2515 *sta_out = sta ?: ERR_PTR(-ENOENT); 2516 return 0; 2517 } 2518 2519 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2520 struct sk_buff *skb, 2521 u32 *info_flags, 2522 u64 *cookie) 2523 { 2524 struct sk_buff *ack_skb; 2525 u16 info_id = 0; 2526 2527 if (skb->sk) 2528 ack_skb = skb_clone_sk(skb); 2529 else 2530 ack_skb = skb_clone(skb, GFP_ATOMIC); 2531 2532 if (ack_skb) { 2533 unsigned long flags; 2534 int id; 2535 2536 spin_lock_irqsave(&local->ack_status_lock, flags); 2537 id = idr_alloc(&local->ack_status_frames, ack_skb, 2538 1, 0x2000, GFP_ATOMIC); 2539 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2540 2541 if (id >= 0) { 2542 info_id = id; 2543 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2544 if (cookie) { 2545 *cookie = ieee80211_mgmt_tx_cookie(local); 2546 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2547 } 2548 } else { 2549 kfree_skb(ack_skb); 2550 } 2551 } 2552 2553 return info_id; 2554 } 2555 2556 /** 2557 * ieee80211_build_hdr - build 802.11 header in the given frame 2558 * @sdata: virtual interface to build the header for 2559 * @skb: the skb to build the header in 2560 * @info_flags: skb flags to set 2561 * @sta: the station pointer 2562 * @ctrl_flags: info control flags to set 2563 * @cookie: cookie pointer to fill (if not %NULL) 2564 * 2565 * This function takes the skb with 802.3 header and reformats the header to 2566 * the appropriate IEEE 802.11 header based on which interface the packet is 2567 * being transmitted on. 2568 * 2569 * Note that this function also takes care of the TX status request and 2570 * potential unsharing of the SKB - this needs to be interleaved with the 2571 * header building. 2572 * 2573 * The function requires the read-side RCU lock held 2574 * 2575 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2576 */ 2577 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2578 struct sk_buff *skb, u32 info_flags, 2579 struct sta_info *sta, u32 ctrl_flags, 2580 u64 *cookie) 2581 { 2582 struct ieee80211_local *local = sdata->local; 2583 struct ieee80211_tx_info *info; 2584 int head_need; 2585 u16 ethertype, hdrlen, meshhdrlen = 0; 2586 __le16 fc; 2587 struct ieee80211_hdr hdr; 2588 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2589 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2590 const u8 *encaps_data; 2591 int encaps_len, skip_header_bytes; 2592 bool wme_sta = false, authorized = false; 2593 bool tdls_peer; 2594 bool multicast; 2595 u16 info_id = 0; 2596 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2597 enum nl80211_band band; 2598 int ret; 2599 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2600 2601 if (IS_ERR(sta)) 2602 sta = NULL; 2603 2604 #ifdef CONFIG_MAC80211_DEBUGFS 2605 if (local->force_tx_status) 2606 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2607 #endif 2608 2609 /* convert Ethernet header to proper 802.11 header (based on 2610 * operation mode) */ 2611 ethertype = (skb->data[12] << 8) | skb->data[13]; 2612 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2613 2614 if (!ieee80211_vif_is_mld(&sdata->vif)) 2615 chanctx_conf = 2616 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2617 2618 switch (sdata->vif.type) { 2619 case NL80211_IFTYPE_AP_VLAN: 2620 if (sdata->wdev.use_4addr) { 2621 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2622 /* RA TA DA SA */ 2623 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2624 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2625 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2626 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2627 hdrlen = 30; 2628 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2629 wme_sta = sta->sta.wme; 2630 } 2631 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2632 struct ieee80211_sub_if_data *ap_sdata; 2633 2634 /* override chanctx_conf from AP (we don't have one) */ 2635 ap_sdata = container_of(sdata->bss, 2636 struct ieee80211_sub_if_data, 2637 u.ap); 2638 chanctx_conf = 2639 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2640 } 2641 if (sdata->wdev.use_4addr) 2642 break; 2643 fallthrough; 2644 case NL80211_IFTYPE_AP: 2645 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2646 /* DA BSSID SA */ 2647 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2648 2649 if (ieee80211_vif_is_mld(&sdata->vif) && sta && !sta->sta.mlo) { 2650 struct ieee80211_link_data *link; 2651 2652 link_id = sta->deflink.link_id; 2653 link = rcu_dereference(sdata->link[link_id]); 2654 if (WARN_ON(!link)) { 2655 ret = -ENOLINK; 2656 goto free; 2657 } 2658 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2659 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2660 (sta && sta->sta.mlo)) { 2661 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2662 } else { 2663 struct ieee80211_bss_conf *conf; 2664 2665 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2666 if (unlikely(!conf)) { 2667 ret = -ENOLINK; 2668 goto free; 2669 } 2670 2671 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2672 } 2673 2674 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2675 hdrlen = 24; 2676 break; 2677 #ifdef CONFIG_MAC80211_MESH 2678 case NL80211_IFTYPE_MESH_POINT: 2679 if (!is_multicast_ether_addr(skb->data)) { 2680 struct sta_info *next_hop; 2681 bool mpp_lookup = true; 2682 2683 mpath = mesh_path_lookup(sdata, skb->data); 2684 if (mpath) { 2685 mpp_lookup = false; 2686 next_hop = rcu_dereference(mpath->next_hop); 2687 if (!next_hop || 2688 !(mpath->flags & (MESH_PATH_ACTIVE | 2689 MESH_PATH_RESOLVING))) 2690 mpp_lookup = true; 2691 } 2692 2693 if (mpp_lookup) { 2694 mppath = mpp_path_lookup(sdata, skb->data); 2695 if (mppath) 2696 mppath->exp_time = jiffies; 2697 } 2698 2699 if (mppath && mpath) 2700 mesh_path_del(sdata, mpath->dst); 2701 } 2702 2703 /* 2704 * Use address extension if it is a packet from 2705 * another interface or if we know the destination 2706 * is being proxied by a portal (i.e. portal address 2707 * differs from proxied address) 2708 */ 2709 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2710 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2711 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2712 skb->data, skb->data + ETH_ALEN); 2713 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2714 NULL, NULL); 2715 } else { 2716 /* DS -> MBSS (802.11-2012 13.11.3.3). 2717 * For unicast with unknown forwarding information, 2718 * destination might be in the MBSS or if that fails 2719 * forwarded to another mesh gate. In either case 2720 * resolution will be handled in ieee80211_xmit(), so 2721 * leave the original DA. This also works for mcast */ 2722 const u8 *mesh_da = skb->data; 2723 2724 if (mppath) 2725 mesh_da = mppath->mpp; 2726 else if (mpath) 2727 mesh_da = mpath->dst; 2728 2729 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2730 mesh_da, sdata->vif.addr); 2731 if (is_multicast_ether_addr(mesh_da)) 2732 /* DA TA mSA AE:SA */ 2733 meshhdrlen = ieee80211_new_mesh_header( 2734 sdata, &mesh_hdr, 2735 skb->data + ETH_ALEN, NULL); 2736 else 2737 /* RA TA mDA mSA AE:DA SA */ 2738 meshhdrlen = ieee80211_new_mesh_header( 2739 sdata, &mesh_hdr, skb->data, 2740 skb->data + ETH_ALEN); 2741 2742 } 2743 2744 /* For injected frames, fill RA right away as nexthop lookup 2745 * will be skipped. 2746 */ 2747 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2748 is_zero_ether_addr(hdr.addr1)) 2749 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2750 break; 2751 #endif 2752 case NL80211_IFTYPE_STATION: 2753 /* we already did checks when looking up the RA STA */ 2754 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2755 2756 if (tdls_peer) { 2757 /* For TDLS only one link can be valid with peer STA */ 2758 int tdls_link_id = sta->sta.valid_links ? 2759 __ffs(sta->sta.valid_links) : 0; 2760 struct ieee80211_link_data *link; 2761 2762 /* DA SA BSSID */ 2763 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2764 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2765 link = rcu_dereference(sdata->link[tdls_link_id]); 2766 if (WARN_ON_ONCE(!link)) { 2767 ret = -EINVAL; 2768 goto free; 2769 } 2770 memcpy(hdr.addr3, link->u.mgd.bssid, ETH_ALEN); 2771 hdrlen = 24; 2772 } else if (sdata->u.mgd.use_4addr && 2773 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2774 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2775 IEEE80211_FCTL_TODS); 2776 /* RA TA DA SA */ 2777 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2778 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2779 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2780 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2781 hdrlen = 30; 2782 } else { 2783 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2784 /* BSSID SA DA */ 2785 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2786 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2787 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2788 hdrlen = 24; 2789 } 2790 break; 2791 case NL80211_IFTYPE_OCB: 2792 /* DA SA BSSID */ 2793 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2794 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2795 eth_broadcast_addr(hdr.addr3); 2796 hdrlen = 24; 2797 break; 2798 case NL80211_IFTYPE_ADHOC: 2799 /* DA SA BSSID */ 2800 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2801 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2802 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2803 hdrlen = 24; 2804 break; 2805 default: 2806 ret = -EINVAL; 2807 goto free; 2808 } 2809 2810 if (!chanctx_conf) { 2811 if (!ieee80211_vif_is_mld(&sdata->vif)) { 2812 ret = -ENOTCONN; 2813 goto free; 2814 } 2815 /* MLD transmissions must not rely on the band */ 2816 band = 0; 2817 } else { 2818 band = chanctx_conf->def.chan->band; 2819 } 2820 2821 multicast = is_multicast_ether_addr(hdr.addr1); 2822 2823 /* sta is always NULL for mesh */ 2824 if (sta) { 2825 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2826 wme_sta = sta->sta.wme; 2827 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2828 /* For mesh, the use of the QoS header is mandatory */ 2829 wme_sta = true; 2830 } 2831 2832 /* receiver does QoS (which also means we do) use it */ 2833 if (wme_sta) { 2834 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2835 hdrlen += 2; 2836 } 2837 2838 /* 2839 * Drop unicast frames to unauthorised stations unless they are 2840 * EAPOL frames from the local station. 2841 */ 2842 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2843 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2844 !multicast && !authorized && 2845 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2846 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2847 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2848 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2849 sdata->name, hdr.addr1); 2850 #endif 2851 2852 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2853 2854 ret = -EPERM; 2855 goto free; 2856 } 2857 2858 if (unlikely(!multicast && 2859 ((skb->sk && 2860 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2861 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2862 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2863 cookie); 2864 2865 /* 2866 * If the skb is shared we need to obtain our own copy. 2867 */ 2868 skb = skb_share_check(skb, GFP_ATOMIC); 2869 if (unlikely(!skb)) { 2870 ret = -ENOMEM; 2871 goto free; 2872 } 2873 2874 hdr.frame_control = fc; 2875 hdr.duration_id = 0; 2876 hdr.seq_ctrl = 0; 2877 2878 skip_header_bytes = ETH_HLEN; 2879 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2880 encaps_data = bridge_tunnel_header; 2881 encaps_len = sizeof(bridge_tunnel_header); 2882 skip_header_bytes -= 2; 2883 } else if (ethertype >= ETH_P_802_3_MIN) { 2884 encaps_data = rfc1042_header; 2885 encaps_len = sizeof(rfc1042_header); 2886 skip_header_bytes -= 2; 2887 } else { 2888 encaps_data = NULL; 2889 encaps_len = 0; 2890 } 2891 2892 skb_pull(skb, skip_header_bytes); 2893 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2894 2895 /* 2896 * So we need to modify the skb header and hence need a copy of 2897 * that. The head_need variable above doesn't, so far, include 2898 * the needed header space that we don't need right away. If we 2899 * can, then we don't reallocate right now but only after the 2900 * frame arrives at the master device (if it does...) 2901 * 2902 * If we cannot, however, then we will reallocate to include all 2903 * the ever needed space. Also, if we need to reallocate it anyway, 2904 * make it big enough for everything we may ever need. 2905 */ 2906 2907 if (head_need > 0 || skb_cloned(skb)) { 2908 head_need += IEEE80211_ENCRYPT_HEADROOM; 2909 head_need += local->tx_headroom; 2910 head_need = max_t(int, 0, head_need); 2911 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2912 ieee80211_free_txskb(&local->hw, skb); 2913 skb = NULL; 2914 return ERR_PTR(-ENOMEM); 2915 } 2916 } 2917 2918 if (encaps_data) 2919 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2920 2921 #ifdef CONFIG_MAC80211_MESH 2922 if (meshhdrlen > 0) 2923 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2924 #endif 2925 2926 if (ieee80211_is_data_qos(fc)) { 2927 __le16 *qos_control; 2928 2929 qos_control = skb_push(skb, 2); 2930 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2931 /* 2932 * Maybe we could actually set some fields here, for now just 2933 * initialise to zero to indicate no special operation. 2934 */ 2935 *qos_control = 0; 2936 } else 2937 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2938 2939 skb_reset_mac_header(skb); 2940 2941 info = IEEE80211_SKB_CB(skb); 2942 memset(info, 0, sizeof(*info)); 2943 2944 info->flags = info_flags; 2945 if (info_id) { 2946 info->status_data = info_id; 2947 info->status_data_idr = 1; 2948 } 2949 info->band = band; 2950 2951 if (likely(!cookie)) { 2952 ctrl_flags |= u32_encode_bits(link_id, 2953 IEEE80211_TX_CTRL_MLO_LINK); 2954 } else { 2955 unsigned int pre_conf_link_id; 2956 2957 /* 2958 * ctrl_flags already have been set by 2959 * ieee80211_tx_control_port(), here 2960 * we just sanity check that 2961 */ 2962 2963 pre_conf_link_id = u32_get_bits(ctrl_flags, 2964 IEEE80211_TX_CTRL_MLO_LINK); 2965 2966 if (pre_conf_link_id != link_id && 2967 link_id != IEEE80211_LINK_UNSPECIFIED) { 2968 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2969 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2970 sdata->name, hdr.addr1, 2971 pre_conf_link_id, link_id); 2972 #endif 2973 ret = -EINVAL; 2974 goto free; 2975 } 2976 } 2977 2978 info->control.flags = ctrl_flags; 2979 2980 return skb; 2981 free: 2982 kfree_skb(skb); 2983 return ERR_PTR(ret); 2984 } 2985 2986 /* 2987 * fast-xmit overview 2988 * 2989 * The core idea of this fast-xmit is to remove per-packet checks by checking 2990 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2991 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2992 * much less work can be done per packet. For example, fragmentation must be 2993 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2994 * in the code here. 2995 * 2996 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2997 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2998 * 2999 * The most difficult part of this is that when any of these assumptions 3000 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3001 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3002 * since the per-packet code no longer checks the conditions. This is reflected 3003 * by the calls to these functions throughout the rest of the code, and must be 3004 * maintained if any of the TX path checks change. 3005 */ 3006 3007 void ieee80211_check_fast_xmit(struct sta_info *sta) 3008 { 3009 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3010 struct ieee80211_local *local = sta->local; 3011 struct ieee80211_sub_if_data *sdata = sta->sdata; 3012 struct ieee80211_hdr *hdr = (void *)build.hdr; 3013 struct ieee80211_chanctx_conf *chanctx_conf; 3014 __le16 fc; 3015 3016 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3017 return; 3018 3019 if (ieee80211_vif_is_mesh(&sdata->vif)) 3020 mesh_fast_tx_flush_sta(sdata, sta); 3021 3022 /* Locking here protects both the pointer itself, and against concurrent 3023 * invocations winning data access races to, e.g., the key pointer that 3024 * is used. 3025 * Without it, the invocation of this function right after the key 3026 * pointer changes wouldn't be sufficient, as another CPU could access 3027 * the pointer, then stall, and then do the cache update after the CPU 3028 * that invalidated the key. 3029 * With the locking, such scenarios cannot happen as the check for the 3030 * key and the fast-tx assignment are done atomically, so the CPU that 3031 * modifies the key will either wait or other one will see the key 3032 * cleared/changed already. 3033 */ 3034 spin_lock_bh(&sta->lock); 3035 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3036 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3037 sdata->vif.type == NL80211_IFTYPE_STATION) 3038 goto out; 3039 3040 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3041 goto out; 3042 3043 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3044 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3045 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3046 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3047 goto out; 3048 3049 if (sdata->noack_map) 3050 goto out; 3051 3052 /* fast-xmit doesn't handle fragmentation at all */ 3053 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3054 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3055 goto out; 3056 3057 if (!ieee80211_vif_is_mld(&sdata->vif)) { 3058 rcu_read_lock(); 3059 chanctx_conf = 3060 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3061 if (!chanctx_conf) { 3062 rcu_read_unlock(); 3063 goto out; 3064 } 3065 build.band = chanctx_conf->def.chan->band; 3066 rcu_read_unlock(); 3067 } else { 3068 /* MLD transmissions must not rely on the band */ 3069 build.band = 0; 3070 } 3071 3072 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3073 3074 switch (sdata->vif.type) { 3075 case NL80211_IFTYPE_ADHOC: 3076 /* DA SA BSSID */ 3077 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3078 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3079 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3080 build.hdr_len = 24; 3081 break; 3082 case NL80211_IFTYPE_STATION: 3083 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3084 /* For TDLS only one link can be valid with peer STA */ 3085 int tdls_link_id = sta->sta.valid_links ? 3086 __ffs(sta->sta.valid_links) : 0; 3087 struct ieee80211_link_data *link; 3088 3089 /* DA SA BSSID */ 3090 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3091 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3092 link = rcu_dereference(sdata->link[tdls_link_id]); 3093 if (WARN_ON_ONCE(!link)) 3094 break; 3095 memcpy(hdr->addr3, link->u.mgd.bssid, ETH_ALEN); 3096 build.hdr_len = 24; 3097 break; 3098 } 3099 3100 if (sdata->u.mgd.use_4addr) { 3101 /* non-regular ethertype cannot use the fastpath */ 3102 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3103 IEEE80211_FCTL_TODS); 3104 /* RA TA DA SA */ 3105 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3106 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3107 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3108 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3109 build.hdr_len = 30; 3110 break; 3111 } 3112 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3113 /* BSSID SA DA */ 3114 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3115 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3116 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3117 build.hdr_len = 24; 3118 break; 3119 case NL80211_IFTYPE_AP_VLAN: 3120 if (sdata->wdev.use_4addr) { 3121 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3122 IEEE80211_FCTL_TODS); 3123 /* RA TA DA SA */ 3124 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3125 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3126 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3127 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3128 build.hdr_len = 30; 3129 break; 3130 } 3131 fallthrough; 3132 case NL80211_IFTYPE_AP: 3133 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3134 /* DA BSSID SA */ 3135 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3136 if (sta->sta.mlo || !ieee80211_vif_is_mld(&sdata->vif)) { 3137 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3138 } else { 3139 unsigned int link_id = sta->deflink.link_id; 3140 struct ieee80211_link_data *link; 3141 3142 rcu_read_lock(); 3143 link = rcu_dereference(sdata->link[link_id]); 3144 if (WARN_ON(!link)) { 3145 rcu_read_unlock(); 3146 goto out; 3147 } 3148 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3149 rcu_read_unlock(); 3150 } 3151 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3152 build.hdr_len = 24; 3153 break; 3154 default: 3155 /* not handled on fast-xmit */ 3156 goto out; 3157 } 3158 3159 if (sta->sta.wme) { 3160 build.hdr_len += 2; 3161 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3162 } 3163 3164 /* We store the key here so there's no point in using rcu_dereference() 3165 * but that's fine because the code that changes the pointers will call 3166 * this function after doing so. For a single CPU that would be enough, 3167 * for multiple see the comment above. 3168 */ 3169 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3170 if (!build.key) 3171 build.key = rcu_access_pointer(sdata->default_unicast_key); 3172 if (build.key) { 3173 bool gen_iv, iv_spc, mmic; 3174 3175 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3176 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3177 mmic = build.key->conf.flags & 3178 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3179 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3180 3181 /* don't handle software crypto */ 3182 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3183 goto out; 3184 3185 /* Key is being removed */ 3186 if (build.key->flags & KEY_FLAG_TAINTED) 3187 goto out; 3188 3189 switch (build.key->conf.cipher) { 3190 case WLAN_CIPHER_SUITE_CCMP: 3191 case WLAN_CIPHER_SUITE_CCMP_256: 3192 if (gen_iv) 3193 build.pn_offs = build.hdr_len; 3194 if (gen_iv || iv_spc) 3195 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3196 break; 3197 case WLAN_CIPHER_SUITE_GCMP: 3198 case WLAN_CIPHER_SUITE_GCMP_256: 3199 if (gen_iv) 3200 build.pn_offs = build.hdr_len; 3201 if (gen_iv || iv_spc) 3202 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3203 break; 3204 case WLAN_CIPHER_SUITE_TKIP: 3205 /* cannot handle MMIC or IV generation in xmit-fast */ 3206 if (mmic || gen_iv) 3207 goto out; 3208 if (iv_spc) 3209 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3210 break; 3211 case WLAN_CIPHER_SUITE_WEP40: 3212 case WLAN_CIPHER_SUITE_WEP104: 3213 /* cannot handle IV generation in fast-xmit */ 3214 if (gen_iv) 3215 goto out; 3216 if (iv_spc) 3217 build.hdr_len += IEEE80211_WEP_IV_LEN; 3218 break; 3219 case WLAN_CIPHER_SUITE_AES_CMAC: 3220 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3221 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3222 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3223 WARN(1, 3224 "management cipher suite 0x%x enabled for data\n", 3225 build.key->conf.cipher); 3226 goto out; 3227 default: 3228 /* we don't know how to generate IVs for this at all */ 3229 if (WARN_ON(gen_iv)) 3230 goto out; 3231 } 3232 3233 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3234 } 3235 3236 hdr->frame_control = fc; 3237 3238 memcpy(build.hdr + build.hdr_len, 3239 rfc1042_header, sizeof(rfc1042_header)); 3240 build.hdr_len += sizeof(rfc1042_header); 3241 3242 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3243 /* if the kmemdup fails, continue w/o fast_tx */ 3244 3245 out: 3246 /* we might have raced against another call to this function */ 3247 old = rcu_dereference_protected(sta->fast_tx, 3248 lockdep_is_held(&sta->lock)); 3249 rcu_assign_pointer(sta->fast_tx, fast_tx); 3250 if (old) 3251 kfree_rcu(old, rcu_head); 3252 spin_unlock_bh(&sta->lock); 3253 } 3254 3255 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3256 { 3257 struct sta_info *sta; 3258 3259 rcu_read_lock(); 3260 list_for_each_entry_rcu(sta, &local->sta_list, list) 3261 ieee80211_check_fast_xmit(sta); 3262 rcu_read_unlock(); 3263 } 3264 3265 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3266 { 3267 struct ieee80211_local *local = sdata->local; 3268 struct sta_info *sta; 3269 3270 rcu_read_lock(); 3271 3272 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3273 if (sdata != sta->sdata && 3274 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3275 continue; 3276 ieee80211_check_fast_xmit(sta); 3277 } 3278 3279 rcu_read_unlock(); 3280 } 3281 3282 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3283 { 3284 struct ieee80211_fast_tx *fast_tx; 3285 3286 spin_lock_bh(&sta->lock); 3287 fast_tx = rcu_dereference_protected(sta->fast_tx, 3288 lockdep_is_held(&sta->lock)); 3289 RCU_INIT_POINTER(sta->fast_tx, NULL); 3290 spin_unlock_bh(&sta->lock); 3291 3292 if (fast_tx) 3293 kfree_rcu(fast_tx, rcu_head); 3294 } 3295 3296 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3297 struct sk_buff *skb, int headroom) 3298 { 3299 if (skb_headroom(skb) < headroom) { 3300 I802_DEBUG_INC(local->tx_expand_skb_head); 3301 3302 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3303 wiphy_debug(local->hw.wiphy, 3304 "failed to reallocate TX buffer\n"); 3305 return false; 3306 } 3307 } 3308 3309 return true; 3310 } 3311 3312 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3313 struct ieee80211_fast_tx *fast_tx, 3314 struct sk_buff *skb) 3315 { 3316 struct ieee80211_local *local = sdata->local; 3317 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3318 struct ieee80211_hdr *hdr; 3319 struct ethhdr *amsdu_hdr; 3320 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3321 int subframe_len = skb->len - hdr_len; 3322 void *data; 3323 u8 *qc, *h_80211_src, *h_80211_dst; 3324 const u8 *bssid; 3325 3326 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3327 return false; 3328 3329 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3330 return true; 3331 3332 if (!ieee80211_amsdu_realloc_pad(local, skb, 3333 sizeof(*amsdu_hdr) + 3334 local->hw.extra_tx_headroom)) 3335 return false; 3336 3337 data = skb_push(skb, sizeof(*amsdu_hdr)); 3338 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3339 hdr = data; 3340 amsdu_hdr = data + hdr_len; 3341 /* h_80211_src/dst is addr* field within hdr */ 3342 h_80211_src = data + fast_tx->sa_offs; 3343 h_80211_dst = data + fast_tx->da_offs; 3344 3345 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3346 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3347 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3348 3349 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3350 * fields needs to be changed to BSSID for A-MSDU frames depending 3351 * on FromDS/ToDS values. 3352 */ 3353 switch (sdata->vif.type) { 3354 case NL80211_IFTYPE_STATION: 3355 bssid = sdata->vif.cfg.ap_addr; 3356 break; 3357 case NL80211_IFTYPE_AP: 3358 case NL80211_IFTYPE_AP_VLAN: 3359 bssid = sdata->vif.addr; 3360 break; 3361 default: 3362 bssid = NULL; 3363 } 3364 3365 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3366 ether_addr_copy(h_80211_src, bssid); 3367 3368 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3369 ether_addr_copy(h_80211_dst, bssid); 3370 3371 qc = ieee80211_get_qos_ctl(hdr); 3372 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3373 3374 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3375 3376 return true; 3377 } 3378 3379 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3380 struct sta_info *sta, 3381 struct ieee80211_fast_tx *fast_tx, 3382 struct sk_buff *skb, 3383 const u8 *da, const u8 *sa) 3384 { 3385 struct ieee80211_local *local = sdata->local; 3386 struct fq *fq = &local->fq; 3387 struct fq_tin *tin; 3388 struct fq_flow *flow; 3389 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3390 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3391 struct txq_info *txqi; 3392 struct sk_buff **frag_tail, *head; 3393 int subframe_len = skb->len - ETH_ALEN; 3394 u8 max_subframes = sta->sta.max_amsdu_subframes; 3395 int max_frags = local->hw.max_tx_fragments; 3396 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3397 int orig_truesize; 3398 u32 flow_idx; 3399 __be16 len; 3400 void *data; 3401 bool ret = false; 3402 unsigned int orig_len; 3403 int n = 2, nfrags, pad = 0; 3404 u16 hdrlen; 3405 3406 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3407 return false; 3408 3409 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3410 return false; 3411 3412 if (ieee80211_vif_is_mesh(&sdata->vif)) 3413 return false; 3414 3415 if (skb_is_gso(skb)) 3416 return false; 3417 3418 if (!txq) 3419 return false; 3420 3421 txqi = to_txq_info(txq); 3422 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3423 return false; 3424 3425 if (sta->sta.cur->max_rc_amsdu_len) 3426 max_amsdu_len = min_t(int, max_amsdu_len, 3427 sta->sta.cur->max_rc_amsdu_len); 3428 3429 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3430 max_amsdu_len = min_t(int, max_amsdu_len, 3431 sta->sta.cur->max_tid_amsdu_len[tid]); 3432 3433 flow_idx = fq_flow_idx(fq, skb); 3434 3435 spin_lock_bh(&fq->lock); 3436 3437 /* TODO: Ideally aggregation should be done on dequeue to remain 3438 * responsive to environment changes. 3439 */ 3440 3441 tin = &txqi->tin; 3442 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3443 head = skb_peek_tail(&flow->queue); 3444 if (!head || skb_is_gso(head)) 3445 goto out; 3446 3447 orig_truesize = head->truesize; 3448 orig_len = head->len; 3449 3450 if (skb->len + head->len > max_amsdu_len) 3451 goto out; 3452 3453 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3454 nfrags += 1 + skb_shinfo(head)->nr_frags; 3455 frag_tail = &skb_shinfo(head)->frag_list; 3456 while (*frag_tail) { 3457 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3458 frag_tail = &(*frag_tail)->next; 3459 n++; 3460 } 3461 3462 if (max_subframes && n > max_subframes) 3463 goto out; 3464 3465 if (max_frags && nfrags > max_frags) 3466 goto out; 3467 3468 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3469 goto out; 3470 3471 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3472 goto out; 3473 3474 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3475 * and frag_tail should be &skb_shinfo(head)->frag_list. 3476 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3477 * Reload frag_tail to have it pointing to the correct place. 3478 */ 3479 if (n == 2) 3480 frag_tail = &skb_shinfo(head)->frag_list; 3481 3482 /* 3483 * Pad out the previous subframe to a multiple of 4 by adding the 3484 * padding to the next one, that's being added. Note that head->len 3485 * is the length of the full A-MSDU, but that works since each time 3486 * we add a new subframe we pad out the previous one to a multiple 3487 * of 4 and thus it no longer matters in the next round. 3488 */ 3489 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3490 if ((head->len - hdrlen) & 3) 3491 pad = 4 - ((head->len - hdrlen) & 3); 3492 3493 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3494 2 + pad)) 3495 goto out_recalc; 3496 3497 ret = true; 3498 data = skb_push(skb, ETH_ALEN + 2); 3499 ether_addr_copy(data, da); 3500 ether_addr_copy(data + ETH_ALEN, sa); 3501 3502 data += 2 * ETH_ALEN; 3503 len = cpu_to_be16(subframe_len); 3504 memcpy(data, &len, 2); 3505 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3506 3507 memset(skb_push(skb, pad), 0, pad); 3508 3509 head->len += skb->len; 3510 head->data_len += skb->len; 3511 *frag_tail = skb; 3512 3513 out_recalc: 3514 fq->memory_usage += head->truesize - orig_truesize; 3515 if (head->len != orig_len) { 3516 flow->backlog += head->len - orig_len; 3517 tin->backlog_bytes += head->len - orig_len; 3518 } 3519 out: 3520 spin_unlock_bh(&fq->lock); 3521 3522 return ret; 3523 } 3524 3525 /* 3526 * Can be called while the sta lock is held. Anything that can cause packets to 3527 * be generated will cause deadlock! 3528 */ 3529 static ieee80211_tx_result 3530 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3531 struct sta_info *sta, u8 pn_offs, 3532 struct ieee80211_key *key, 3533 struct ieee80211_tx_data *tx) 3534 { 3535 struct sk_buff *skb = tx->skb; 3536 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3537 struct ieee80211_hdr *hdr = (void *)skb->data; 3538 u8 tid = IEEE80211_NUM_TIDS; 3539 3540 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3541 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3542 return TX_DROP; 3543 3544 if (key) 3545 info->control.hw_key = &key->conf; 3546 3547 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3548 3549 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3550 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3551 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3552 } else { 3553 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3554 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3555 sdata->sequence_number += 0x10; 3556 } 3557 3558 if (skb_shinfo(skb)->gso_size) 3559 sta->deflink.tx_stats.msdu[tid] += 3560 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3561 else 3562 sta->deflink.tx_stats.msdu[tid]++; 3563 3564 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3565 3566 /* statistics normally done by ieee80211_tx_h_stats (but that 3567 * has to consider fragmentation, so is more complex) 3568 */ 3569 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3570 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3571 3572 if (pn_offs) { 3573 u64 pn; 3574 u8 *crypto_hdr = skb->data + pn_offs; 3575 3576 switch (key->conf.cipher) { 3577 case WLAN_CIPHER_SUITE_CCMP: 3578 case WLAN_CIPHER_SUITE_CCMP_256: 3579 case WLAN_CIPHER_SUITE_GCMP: 3580 case WLAN_CIPHER_SUITE_GCMP_256: 3581 pn = atomic64_inc_return(&key->conf.tx_pn); 3582 crypto_hdr[0] = pn; 3583 crypto_hdr[1] = pn >> 8; 3584 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3585 crypto_hdr[4] = pn >> 16; 3586 crypto_hdr[5] = pn >> 24; 3587 crypto_hdr[6] = pn >> 32; 3588 crypto_hdr[7] = pn >> 40; 3589 break; 3590 } 3591 } 3592 3593 return TX_CONTINUE; 3594 } 3595 3596 static netdev_features_t 3597 ieee80211_sdata_netdev_features(struct ieee80211_sub_if_data *sdata) 3598 { 3599 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN) 3600 return sdata->vif.netdev_features; 3601 3602 if (!sdata->bss) 3603 return 0; 3604 3605 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 3606 return sdata->vif.netdev_features; 3607 } 3608 3609 static struct sk_buff * 3610 ieee80211_tx_skb_fixup(struct sk_buff *skb, netdev_features_t features) 3611 { 3612 if (skb_is_gso(skb)) { 3613 struct sk_buff *segs; 3614 3615 segs = skb_gso_segment(skb, features); 3616 if (!segs) 3617 return skb; 3618 if (IS_ERR(segs)) 3619 goto free; 3620 3621 consume_skb(skb); 3622 return segs; 3623 } 3624 3625 if (skb_needs_linearize(skb, features) && __skb_linearize(skb)) 3626 goto free; 3627 3628 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3629 int ofs = skb_checksum_start_offset(skb); 3630 3631 if (skb->encapsulation) 3632 skb_set_inner_transport_header(skb, ofs); 3633 else 3634 skb_set_transport_header(skb, ofs); 3635 3636 if (skb_csum_hwoffload_help(skb, features)) 3637 goto free; 3638 } 3639 3640 skb_mark_not_on_list(skb); 3641 return skb; 3642 3643 free: 3644 kfree_skb(skb); 3645 return NULL; 3646 } 3647 3648 void __ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3649 struct sta_info *sta, 3650 struct ieee80211_fast_tx *fast_tx, 3651 struct sk_buff *skb, bool ampdu, 3652 const u8 *da, const u8 *sa) 3653 { 3654 struct ieee80211_local *local = sdata->local; 3655 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3656 struct ieee80211_tx_info *info; 3657 struct ieee80211_tx_data tx; 3658 ieee80211_tx_result r; 3659 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3660 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3661 3662 skb = skb_share_check(skb, GFP_ATOMIC); 3663 if (unlikely(!skb)) 3664 return; 3665 3666 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3667 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb, da, sa)) 3668 return; 3669 3670 /* will not be crypto-handled beyond what we do here, so use false 3671 * as the may-encrypt argument for the resize to not account for 3672 * more room than we already have in 'extra_head' 3673 */ 3674 if (unlikely(ieee80211_skb_resize(sdata, skb, 3675 max_t(int, extra_head + hw_headroom - 3676 skb_headroom(skb), 0), 3677 ENCRYPT_NO))) 3678 goto free; 3679 3680 hdr = skb_push(skb, extra_head); 3681 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3682 memcpy(skb->data + fast_tx->da_offs, da, ETH_ALEN); 3683 memcpy(skb->data + fast_tx->sa_offs, sa, ETH_ALEN); 3684 3685 info = IEEE80211_SKB_CB(skb); 3686 memset(info, 0, sizeof(*info)); 3687 info->band = fast_tx->band; 3688 info->control.vif = &sdata->vif; 3689 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3690 IEEE80211_TX_CTL_DONTFRAG; 3691 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3692 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3693 IEEE80211_TX_CTRL_MLO_LINK); 3694 3695 #ifdef CONFIG_MAC80211_DEBUGFS 3696 if (local->force_tx_status) 3697 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3698 #endif 3699 3700 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3701 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3702 3703 *ieee80211_get_qos_ctl(hdr) = tid; 3704 } 3705 3706 __skb_queue_head_init(&tx.skbs); 3707 3708 tx.flags = IEEE80211_TX_UNICAST; 3709 tx.local = local; 3710 tx.sdata = sdata; 3711 tx.sta = sta; 3712 tx.key = fast_tx->key; 3713 3714 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3715 return; 3716 3717 tx.skb = skb; 3718 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3719 fast_tx->key, &tx); 3720 tx.skb = NULL; 3721 if (r == TX_DROP) 3722 goto free; 3723 3724 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3725 sdata = container_of(sdata->bss, 3726 struct ieee80211_sub_if_data, u.ap); 3727 3728 __skb_queue_tail(&tx.skbs, skb); 3729 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3730 return; 3731 3732 free: 3733 kfree_skb(skb); 3734 } 3735 3736 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3737 struct sta_info *sta, 3738 struct ieee80211_fast_tx *fast_tx, 3739 struct sk_buff *skb) 3740 { 3741 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3742 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3743 struct tid_ampdu_tx *tid_tx = NULL; 3744 struct sk_buff *next; 3745 struct ethhdr eth; 3746 u8 tid = IEEE80211_NUM_TIDS; 3747 3748 /* control port protocol needs a lot of special handling */ 3749 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3750 return false; 3751 3752 /* only RFC 1042 SNAP */ 3753 if (ethertype < ETH_P_802_3_MIN) 3754 return false; 3755 3756 /* don't handle TX status request here either */ 3757 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3758 return false; 3759 3760 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3761 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3762 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3763 if (tid_tx) { 3764 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3765 return false; 3766 if (tid_tx->timeout) 3767 tid_tx->last_tx = jiffies; 3768 } 3769 } 3770 3771 memcpy(ð, skb->data, ETH_HLEN - 2); 3772 3773 /* after this point (skb is modified) we cannot return false */ 3774 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 3775 if (!skb) 3776 return true; 3777 3778 skb_list_walk_safe(skb, skb, next) { 3779 skb_mark_not_on_list(skb); 3780 __ieee80211_xmit_fast(sdata, sta, fast_tx, skb, tid_tx, 3781 eth.h_dest, eth.h_source); 3782 } 3783 3784 return true; 3785 } 3786 3787 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3788 struct ieee80211_txq *txq) 3789 { 3790 struct ieee80211_local *local = hw_to_local(hw); 3791 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3792 struct ieee80211_hdr *hdr; 3793 struct sk_buff *skb = NULL; 3794 struct fq *fq = &local->fq; 3795 struct fq_tin *tin = &txqi->tin; 3796 struct ieee80211_tx_info *info; 3797 struct ieee80211_tx_data tx; 3798 ieee80211_tx_result r; 3799 struct ieee80211_vif *vif = txq->vif; 3800 int q = vif->hw_queue[txq->ac]; 3801 unsigned long flags; 3802 bool q_stopped; 3803 3804 WARN_ON_ONCE(softirq_count() == 0); 3805 3806 if (!ieee80211_txq_airtime_check(hw, txq)) 3807 return NULL; 3808 3809 begin: 3810 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3811 q_stopped = local->queue_stop_reasons[q]; 3812 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3813 3814 if (unlikely(q_stopped)) { 3815 /* mark for waking later */ 3816 set_bit(IEEE80211_TXQ_DIRTY, &txqi->flags); 3817 return NULL; 3818 } 3819 3820 spin_lock_bh(&fq->lock); 3821 3822 /* Make sure fragments stay together. */ 3823 skb = __skb_dequeue(&txqi->frags); 3824 if (unlikely(skb)) { 3825 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3826 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3827 goto out; 3828 IEEE80211_SKB_CB(skb)->control.flags &= 3829 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3830 } else { 3831 if (unlikely(test_bit(IEEE80211_TXQ_STOP, &txqi->flags))) 3832 goto out; 3833 3834 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3835 } 3836 3837 if (!skb) 3838 goto out; 3839 3840 spin_unlock_bh(&fq->lock); 3841 3842 hdr = (struct ieee80211_hdr *)skb->data; 3843 info = IEEE80211_SKB_CB(skb); 3844 3845 memset(&tx, 0, sizeof(tx)); 3846 __skb_queue_head_init(&tx.skbs); 3847 tx.local = local; 3848 tx.skb = skb; 3849 tx.sdata = vif_to_sdata(info->control.vif); 3850 3851 if (txq->sta) { 3852 tx.sta = container_of(txq->sta, struct sta_info, sta); 3853 /* 3854 * Drop unicast frames to unauthorised stations unless they are 3855 * injected frames or EAPOL frames from the local station. 3856 */ 3857 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3858 ieee80211_is_data(hdr->frame_control) && 3859 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3860 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3861 !is_multicast_ether_addr(hdr->addr1) && 3862 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3863 (!(info->control.flags & 3864 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3865 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3866 NULL)))) { 3867 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3868 ieee80211_free_txskb(&local->hw, skb); 3869 goto begin; 3870 } 3871 } 3872 3873 /* 3874 * The key can be removed while the packet was queued, so need to call 3875 * this here to get the current key. 3876 */ 3877 r = ieee80211_tx_h_select_key(&tx); 3878 if (r != TX_CONTINUE) { 3879 ieee80211_free_txskb(&local->hw, skb); 3880 goto begin; 3881 } 3882 3883 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3884 info->flags |= (IEEE80211_TX_CTL_AMPDU | 3885 IEEE80211_TX_CTL_DONTFRAG); 3886 3887 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3888 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3889 r = ieee80211_tx_h_rate_ctrl(&tx); 3890 if (r != TX_CONTINUE) { 3891 ieee80211_free_txskb(&local->hw, skb); 3892 goto begin; 3893 } 3894 } 3895 goto encap_out; 3896 } 3897 3898 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3899 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3900 sta); 3901 u8 pn_offs = 0; 3902 3903 if (tx.key && 3904 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3905 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3906 3907 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3908 tx.key, &tx); 3909 if (r != TX_CONTINUE) { 3910 ieee80211_free_txskb(&local->hw, skb); 3911 goto begin; 3912 } 3913 } else { 3914 if (invoke_tx_handlers_late(&tx)) 3915 goto begin; 3916 3917 skb = __skb_dequeue(&tx.skbs); 3918 3919 if (!skb_queue_empty(&tx.skbs)) { 3920 spin_lock_bh(&fq->lock); 3921 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3922 spin_unlock_bh(&fq->lock); 3923 } 3924 } 3925 3926 if (skb_has_frag_list(skb) && 3927 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3928 if (skb_linearize(skb)) { 3929 ieee80211_free_txskb(&local->hw, skb); 3930 goto begin; 3931 } 3932 } 3933 3934 switch (tx.sdata->vif.type) { 3935 case NL80211_IFTYPE_MONITOR: 3936 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3937 vif = &tx.sdata->vif; 3938 break; 3939 } 3940 tx.sdata = rcu_dereference(local->monitor_sdata); 3941 if (tx.sdata) { 3942 vif = &tx.sdata->vif; 3943 info->hw_queue = 3944 vif->hw_queue[skb_get_queue_mapping(skb)]; 3945 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3946 ieee80211_free_txskb(&local->hw, skb); 3947 goto begin; 3948 } else { 3949 vif = NULL; 3950 } 3951 break; 3952 case NL80211_IFTYPE_AP_VLAN: 3953 tx.sdata = container_of(tx.sdata->bss, 3954 struct ieee80211_sub_if_data, u.ap); 3955 fallthrough; 3956 default: 3957 vif = &tx.sdata->vif; 3958 break; 3959 } 3960 3961 encap_out: 3962 IEEE80211_SKB_CB(skb)->control.vif = vif; 3963 3964 if (tx.sta && 3965 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3966 bool ampdu = txq->ac != IEEE80211_AC_VO; 3967 u32 airtime; 3968 3969 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3970 skb->len, ampdu); 3971 if (airtime) { 3972 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3973 ieee80211_sta_update_pending_airtime(local, tx.sta, 3974 txq->ac, 3975 airtime, 3976 false); 3977 } 3978 } 3979 3980 return skb; 3981 3982 out: 3983 spin_unlock_bh(&fq->lock); 3984 3985 return skb; 3986 } 3987 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3988 3989 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3990 { 3991 struct airtime_info *air_info = &sta->airtime[ac]; 3992 3993 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3994 } 3995 3996 static void 3997 ieee80211_txq_set_active(struct txq_info *txqi) 3998 { 3999 struct sta_info *sta; 4000 4001 if (!txqi->txq.sta) 4002 return; 4003 4004 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4005 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 4006 } 4007 4008 static bool 4009 ieee80211_txq_keep_active(struct txq_info *txqi) 4010 { 4011 struct sta_info *sta; 4012 u32 diff; 4013 4014 if (!txqi->txq.sta) 4015 return false; 4016 4017 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4018 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 4019 return false; 4020 4021 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 4022 4023 return diff <= AIRTIME_ACTIVE_DURATION; 4024 } 4025 4026 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 4027 { 4028 struct ieee80211_local *local = hw_to_local(hw); 4029 struct ieee80211_txq *ret = NULL; 4030 struct txq_info *txqi = NULL, *head = NULL; 4031 bool found_eligible_txq = false; 4032 4033 spin_lock_bh(&local->active_txq_lock[ac]); 4034 4035 if (!local->schedule_round[ac]) 4036 goto out; 4037 4038 begin: 4039 txqi = list_first_entry_or_null(&local->active_txqs[ac], 4040 struct txq_info, 4041 schedule_order); 4042 if (!txqi) 4043 goto out; 4044 4045 if (txqi == head) { 4046 if (!found_eligible_txq) 4047 goto out; 4048 else 4049 found_eligible_txq = false; 4050 } 4051 4052 if (!head) 4053 head = txqi; 4054 4055 if (txqi->txq.sta) { 4056 struct sta_info *sta = container_of(txqi->txq.sta, 4057 struct sta_info, sta); 4058 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 4059 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 4060 4061 if (aql_check) 4062 found_eligible_txq = true; 4063 4064 if (deficit < 0) 4065 sta->airtime[txqi->txq.ac].deficit += 4066 sta->airtime_weight; 4067 4068 if (deficit < 0 || !aql_check) { 4069 list_move_tail(&txqi->schedule_order, 4070 &local->active_txqs[txqi->txq.ac]); 4071 goto begin; 4072 } 4073 } 4074 4075 if (txqi->schedule_round == local->schedule_round[ac]) 4076 goto out; 4077 4078 list_del_init(&txqi->schedule_order); 4079 txqi->schedule_round = local->schedule_round[ac]; 4080 ret = &txqi->txq; 4081 4082 out: 4083 spin_unlock_bh(&local->active_txq_lock[ac]); 4084 return ret; 4085 } 4086 EXPORT_SYMBOL(ieee80211_next_txq); 4087 4088 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4089 struct ieee80211_txq *txq, 4090 bool force) 4091 { 4092 struct ieee80211_local *local = hw_to_local(hw); 4093 struct txq_info *txqi = to_txq_info(txq); 4094 bool has_queue; 4095 4096 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4097 4098 has_queue = force || txq_has_queue(txq); 4099 if (list_empty(&txqi->schedule_order) && 4100 (has_queue || ieee80211_txq_keep_active(txqi))) { 4101 /* If airtime accounting is active, always enqueue STAs at the 4102 * head of the list to ensure that they only get moved to the 4103 * back by the airtime DRR scheduler once they have a negative 4104 * deficit. A station that already has a negative deficit will 4105 * get immediately moved to the back of the list on the next 4106 * call to ieee80211_next_txq(). 4107 */ 4108 if (txqi->txq.sta && local->airtime_flags && has_queue && 4109 wiphy_ext_feature_isset(local->hw.wiphy, 4110 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4111 list_add(&txqi->schedule_order, 4112 &local->active_txqs[txq->ac]); 4113 else 4114 list_add_tail(&txqi->schedule_order, 4115 &local->active_txqs[txq->ac]); 4116 if (has_queue) 4117 ieee80211_txq_set_active(txqi); 4118 } 4119 4120 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4121 } 4122 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4123 4124 DEFINE_STATIC_KEY_FALSE(aql_disable); 4125 4126 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4127 struct ieee80211_txq *txq) 4128 { 4129 struct sta_info *sta; 4130 struct ieee80211_local *local = hw_to_local(hw); 4131 4132 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4133 return true; 4134 4135 if (static_branch_unlikely(&aql_disable)) 4136 return true; 4137 4138 if (!txq->sta) 4139 return true; 4140 4141 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4142 return true; 4143 4144 sta = container_of(txq->sta, struct sta_info, sta); 4145 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4146 sta->airtime[txq->ac].aql_limit_low) 4147 return true; 4148 4149 if (atomic_read(&local->aql_total_pending_airtime) < 4150 local->aql_threshold && 4151 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4152 sta->airtime[txq->ac].aql_limit_high) 4153 return true; 4154 4155 return false; 4156 } 4157 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4158 4159 static bool 4160 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4161 { 4162 unsigned int num_txq = 0; 4163 struct txq_info *txq; 4164 u32 aql_limit; 4165 4166 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4167 return true; 4168 4169 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4170 num_txq++; 4171 4172 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4173 local->aql_txq_limit_high[ac]; 4174 4175 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4176 } 4177 4178 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4179 struct ieee80211_txq *txq) 4180 { 4181 struct ieee80211_local *local = hw_to_local(hw); 4182 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4183 struct sta_info *sta; 4184 u8 ac = txq->ac; 4185 4186 spin_lock_bh(&local->active_txq_lock[ac]); 4187 4188 if (!txqi->txq.sta) 4189 goto out; 4190 4191 if (list_empty(&txqi->schedule_order)) 4192 goto out; 4193 4194 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4195 goto out; 4196 4197 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4198 schedule_order) { 4199 if (iter == txqi) 4200 break; 4201 4202 if (!iter->txq.sta) { 4203 list_move_tail(&iter->schedule_order, 4204 &local->active_txqs[ac]); 4205 continue; 4206 } 4207 sta = container_of(iter->txq.sta, struct sta_info, sta); 4208 if (ieee80211_sta_deficit(sta, ac) < 0) 4209 sta->airtime[ac].deficit += sta->airtime_weight; 4210 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4211 } 4212 4213 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4214 if (sta->airtime[ac].deficit >= 0) 4215 goto out; 4216 4217 sta->airtime[ac].deficit += sta->airtime_weight; 4218 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4219 spin_unlock_bh(&local->active_txq_lock[ac]); 4220 4221 return false; 4222 out: 4223 if (!list_empty(&txqi->schedule_order)) 4224 list_del_init(&txqi->schedule_order); 4225 spin_unlock_bh(&local->active_txq_lock[ac]); 4226 4227 return true; 4228 } 4229 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4230 4231 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4232 { 4233 struct ieee80211_local *local = hw_to_local(hw); 4234 4235 spin_lock_bh(&local->active_txq_lock[ac]); 4236 4237 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4238 local->schedule_round[ac]++; 4239 if (!local->schedule_round[ac]) 4240 local->schedule_round[ac]++; 4241 } else { 4242 local->schedule_round[ac] = 0; 4243 } 4244 4245 spin_unlock_bh(&local->active_txq_lock[ac]); 4246 } 4247 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4248 4249 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4250 struct net_device *dev, 4251 u32 info_flags, 4252 u32 ctrl_flags, 4253 u64 *cookie) 4254 { 4255 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4256 struct ieee80211_local *local = sdata->local; 4257 struct sta_info *sta; 4258 struct sk_buff *next; 4259 int len = skb->len; 4260 4261 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4262 kfree_skb(skb); 4263 return; 4264 } 4265 4266 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4267 4268 rcu_read_lock(); 4269 4270 if (ieee80211_vif_is_mesh(&sdata->vif) && 4271 ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT) && 4272 ieee80211_mesh_xmit_fast(sdata, skb, ctrl_flags)) 4273 goto out; 4274 4275 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4276 goto out_free; 4277 4278 if (IS_ERR(sta)) 4279 sta = NULL; 4280 4281 skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, sta, skb)); 4282 ieee80211_aggr_check(sdata, sta, skb); 4283 4284 if (sta) { 4285 struct ieee80211_fast_tx *fast_tx; 4286 4287 fast_tx = rcu_dereference(sta->fast_tx); 4288 4289 if (fast_tx && 4290 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4291 goto out; 4292 } 4293 4294 /* the frame could be fragmented, software-encrypted, and other 4295 * things so we cannot really handle checksum or GSO offload. 4296 * fix it up in software before we handle anything else. 4297 */ 4298 skb = ieee80211_tx_skb_fixup(skb, 0); 4299 if (!skb) { 4300 len = 0; 4301 goto out; 4302 } 4303 4304 skb_list_walk_safe(skb, skb, next) { 4305 skb_mark_not_on_list(skb); 4306 4307 if (skb->protocol == sdata->control_port_protocol) 4308 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4309 4310 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4311 sta, ctrl_flags, cookie); 4312 if (IS_ERR(skb)) { 4313 kfree_skb_list(next); 4314 goto out; 4315 } 4316 4317 dev_sw_netstats_tx_add(dev, 1, skb->len); 4318 4319 ieee80211_xmit(sdata, sta, skb); 4320 } 4321 goto out; 4322 out_free: 4323 kfree_skb(skb); 4324 len = 0; 4325 out: 4326 if (len) 4327 ieee80211_tpt_led_trig_tx(local, len); 4328 rcu_read_unlock(); 4329 } 4330 4331 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4332 { 4333 struct ethhdr *eth; 4334 int err; 4335 4336 err = skb_ensure_writable(skb, ETH_HLEN); 4337 if (unlikely(err)) 4338 return err; 4339 4340 eth = (void *)skb->data; 4341 ether_addr_copy(eth->h_dest, sta->sta.addr); 4342 4343 return 0; 4344 } 4345 4346 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4347 struct net_device *dev) 4348 { 4349 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4350 const struct ethhdr *eth = (void *)skb->data; 4351 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4352 __be16 ethertype; 4353 4354 switch (sdata->vif.type) { 4355 case NL80211_IFTYPE_AP_VLAN: 4356 if (sdata->u.vlan.sta) 4357 return false; 4358 if (sdata->wdev.use_4addr) 4359 return false; 4360 fallthrough; 4361 case NL80211_IFTYPE_AP: 4362 /* check runtime toggle for this bss */ 4363 if (!sdata->bss->multicast_to_unicast) 4364 return false; 4365 break; 4366 default: 4367 return false; 4368 } 4369 4370 /* multicast to unicast conversion only for some payload */ 4371 ethertype = eth->h_proto; 4372 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4373 ethertype = ethvlan->h_vlan_encapsulated_proto; 4374 switch (ethertype) { 4375 case htons(ETH_P_ARP): 4376 case htons(ETH_P_IP): 4377 case htons(ETH_P_IPV6): 4378 break; 4379 default: 4380 return false; 4381 } 4382 4383 return true; 4384 } 4385 4386 static void 4387 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4388 struct sk_buff_head *queue) 4389 { 4390 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4391 struct ieee80211_local *local = sdata->local; 4392 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4393 struct sta_info *sta, *first = NULL; 4394 struct sk_buff *cloned_skb; 4395 4396 rcu_read_lock(); 4397 4398 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4399 if (sdata != sta->sdata) 4400 /* AP-VLAN mismatch */ 4401 continue; 4402 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4403 /* do not send back to source */ 4404 continue; 4405 if (!first) { 4406 first = sta; 4407 continue; 4408 } 4409 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4410 if (!cloned_skb) 4411 goto multicast; 4412 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4413 dev_kfree_skb(cloned_skb); 4414 goto multicast; 4415 } 4416 __skb_queue_tail(queue, cloned_skb); 4417 } 4418 4419 if (likely(first)) { 4420 if (unlikely(ieee80211_change_da(skb, first))) 4421 goto multicast; 4422 __skb_queue_tail(queue, skb); 4423 } else { 4424 /* no STA connected, drop */ 4425 kfree_skb(skb); 4426 skb = NULL; 4427 } 4428 4429 goto out; 4430 multicast: 4431 __skb_queue_purge(queue); 4432 __skb_queue_tail(queue, skb); 4433 out: 4434 rcu_read_unlock(); 4435 } 4436 4437 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4438 struct sk_buff *skb, u32 ctrl_flags, 4439 unsigned int link_id) 4440 { 4441 struct sk_buff *out; 4442 4443 out = skb_copy(skb, GFP_ATOMIC); 4444 if (!out) 4445 return; 4446 4447 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4448 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4449 } 4450 4451 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4452 struct sk_buff *skb) 4453 { 4454 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4455 unsigned long links = sdata->vif.active_links; 4456 unsigned int link; 4457 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4458 4459 if (hweight16(links) == 1) { 4460 ctrl_flags |= u32_encode_bits(__ffs(links), 4461 IEEE80211_TX_CTRL_MLO_LINK); 4462 4463 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4464 NULL); 4465 return; 4466 } 4467 4468 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4469 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4470 ctrl_flags = 0; 4471 } 4472 kfree_skb(skb); 4473 } 4474 4475 /** 4476 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4477 * @skb: packet to be sent 4478 * @dev: incoming interface 4479 * 4480 * On failure skb will be freed. 4481 */ 4482 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4483 struct net_device *dev) 4484 { 4485 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4486 const struct ethhdr *eth = (void *)skb->data; 4487 4488 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4489 goto normal; 4490 4491 if (unlikely(!ieee80211_sdata_running(sdata))) { 4492 kfree_skb(skb); 4493 return NETDEV_TX_OK; 4494 } 4495 4496 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4497 struct sk_buff_head queue; 4498 4499 __skb_queue_head_init(&queue); 4500 ieee80211_convert_to_unicast(skb, dev, &queue); 4501 while ((skb = __skb_dequeue(&queue))) 4502 __ieee80211_subif_start_xmit(skb, dev, 0, 4503 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4504 NULL); 4505 } else if (ieee80211_vif_is_mld(&sdata->vif) && 4506 sdata->vif.type == NL80211_IFTYPE_AP && 4507 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4508 ieee80211_mlo_multicast_tx(dev, skb); 4509 } else { 4510 normal: 4511 __ieee80211_subif_start_xmit(skb, dev, 0, 4512 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4513 NULL); 4514 } 4515 4516 return NETDEV_TX_OK; 4517 } 4518 4519 4520 4521 static bool __ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4522 struct sk_buff *skb, struct sta_info *sta, 4523 bool txpending) 4524 { 4525 struct ieee80211_local *local = sdata->local; 4526 struct ieee80211_tx_control control = {}; 4527 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4528 struct ieee80211_sta *pubsta = NULL; 4529 unsigned long flags; 4530 int q = info->hw_queue; 4531 4532 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4533 4534 if (local->queue_stop_reasons[q] || 4535 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4536 if (txpending) 4537 skb_queue_head(&local->pending[q], skb); 4538 else 4539 skb_queue_tail(&local->pending[q], skb); 4540 4541 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4542 4543 return false; 4544 } 4545 4546 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4547 4548 if (sta && sta->uploaded) 4549 pubsta = &sta->sta; 4550 4551 control.sta = pubsta; 4552 4553 drv_tx(local, &control, skb); 4554 4555 return true; 4556 } 4557 4558 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4559 struct sk_buff *skb, struct sta_info *sta, 4560 bool txpending) 4561 { 4562 struct ieee80211_local *local = sdata->local; 4563 struct sk_buff *next; 4564 bool ret = true; 4565 4566 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4567 return true; 4568 4569 skb_list_walk_safe(skb, skb, next) { 4570 skb_mark_not_on_list(skb); 4571 if (!__ieee80211_tx_8023(sdata, skb, sta, txpending)) 4572 ret = false; 4573 } 4574 4575 return ret; 4576 } 4577 4578 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4579 struct net_device *dev, struct sta_info *sta, 4580 struct ieee80211_key *key, struct sk_buff *skb) 4581 { 4582 struct ieee80211_tx_info *info; 4583 struct ieee80211_local *local = sdata->local; 4584 struct tid_ampdu_tx *tid_tx; 4585 struct sk_buff *seg, *next; 4586 unsigned int skbs = 0, len = 0; 4587 u16 queue; 4588 u8 tid; 4589 4590 queue = ieee80211_select_queue(sdata, sta, skb); 4591 skb_set_queue_mapping(skb, queue); 4592 4593 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4594 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4595 goto out_free; 4596 4597 skb = skb_share_check(skb, GFP_ATOMIC); 4598 if (unlikely(!skb)) 4599 return; 4600 4601 ieee80211_aggr_check(sdata, sta, skb); 4602 4603 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4604 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4605 if (tid_tx) { 4606 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4607 /* fall back to non-offload slow path */ 4608 __ieee80211_subif_start_xmit(skb, dev, 0, 4609 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4610 NULL); 4611 return; 4612 } 4613 4614 if (tid_tx->timeout) 4615 tid_tx->last_tx = jiffies; 4616 } 4617 4618 skb = ieee80211_tx_skb_fixup(skb, ieee80211_sdata_netdev_features(sdata)); 4619 if (!skb) 4620 return; 4621 4622 info = IEEE80211_SKB_CB(skb); 4623 memset(info, 0, sizeof(*info)); 4624 4625 info->hw_queue = sdata->vif.hw_queue[queue]; 4626 4627 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4628 sdata = container_of(sdata->bss, 4629 struct ieee80211_sub_if_data, u.ap); 4630 4631 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4632 info->control.vif = &sdata->vif; 4633 4634 if (key) 4635 info->control.hw_key = &key->conf; 4636 4637 skb_list_walk_safe(skb, seg, next) { 4638 skbs++; 4639 len += seg->len; 4640 if (seg != skb) 4641 memcpy(IEEE80211_SKB_CB(seg), info, sizeof(*info)); 4642 } 4643 4644 if (unlikely(skb->sk && 4645 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 4646 info->status_data = ieee80211_store_ack_skb(local, skb, 4647 &info->flags, NULL); 4648 if (info->status_data) 4649 info->status_data_idr = 1; 4650 } 4651 4652 dev_sw_netstats_tx_add(dev, skbs, len); 4653 sta->deflink.tx_stats.packets[queue] += skbs; 4654 sta->deflink.tx_stats.bytes[queue] += len; 4655 4656 ieee80211_tpt_led_trig_tx(local, len); 4657 4658 ieee80211_tx_8023(sdata, skb, sta, false); 4659 4660 return; 4661 4662 out_free: 4663 kfree_skb(skb); 4664 } 4665 4666 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4667 struct net_device *dev) 4668 { 4669 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4670 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4671 struct ieee80211_key *key; 4672 struct sta_info *sta; 4673 4674 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4675 kfree_skb(skb); 4676 return NETDEV_TX_OK; 4677 } 4678 4679 rcu_read_lock(); 4680 4681 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4682 kfree_skb(skb); 4683 goto out; 4684 } 4685 4686 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4687 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4688 sdata->control_port_protocol == ehdr->h_proto)) 4689 goto skip_offload; 4690 4691 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4692 if (!key) 4693 key = rcu_dereference(sdata->default_unicast_key); 4694 4695 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4696 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4697 goto skip_offload; 4698 4699 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4700 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4701 goto out; 4702 4703 skip_offload: 4704 ieee80211_subif_start_xmit(skb, dev); 4705 out: 4706 rcu_read_unlock(); 4707 4708 return NETDEV_TX_OK; 4709 } 4710 4711 struct sk_buff * 4712 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4713 struct sk_buff *skb, u32 info_flags) 4714 { 4715 struct ieee80211_hdr *hdr; 4716 struct ieee80211_tx_data tx = { 4717 .local = sdata->local, 4718 .sdata = sdata, 4719 }; 4720 struct sta_info *sta; 4721 4722 rcu_read_lock(); 4723 4724 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4725 kfree_skb(skb); 4726 skb = ERR_PTR(-EINVAL); 4727 goto out; 4728 } 4729 4730 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4731 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4732 if (IS_ERR(skb)) 4733 goto out; 4734 4735 hdr = (void *)skb->data; 4736 tx.sta = sta_info_get(sdata, hdr->addr1); 4737 tx.skb = skb; 4738 4739 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4740 rcu_read_unlock(); 4741 kfree_skb(skb); 4742 return ERR_PTR(-EINVAL); 4743 } 4744 4745 out: 4746 rcu_read_unlock(); 4747 return skb; 4748 } 4749 4750 /* 4751 * ieee80211_clear_tx_pending may not be called in a context where 4752 * it is possible that it packets could come in again. 4753 */ 4754 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4755 { 4756 struct sk_buff *skb; 4757 int i; 4758 4759 for (i = 0; i < local->hw.queues; i++) { 4760 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4761 ieee80211_free_txskb(&local->hw, skb); 4762 } 4763 } 4764 4765 /* 4766 * Returns false if the frame couldn't be transmitted but was queued instead, 4767 * which in this case means re-queued -- take as an indication to stop sending 4768 * more pending frames. 4769 */ 4770 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4771 struct sk_buff *skb) 4772 { 4773 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4774 struct ieee80211_sub_if_data *sdata; 4775 struct sta_info *sta; 4776 struct ieee80211_hdr *hdr; 4777 bool result; 4778 struct ieee80211_chanctx_conf *chanctx_conf; 4779 4780 sdata = vif_to_sdata(info->control.vif); 4781 4782 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4783 /* update band only for non-MLD */ 4784 if (!ieee80211_vif_is_mld(&sdata->vif)) { 4785 chanctx_conf = 4786 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4787 if (unlikely(!chanctx_conf)) { 4788 dev_kfree_skb(skb); 4789 return true; 4790 } 4791 info->band = chanctx_conf->def.chan->band; 4792 } 4793 result = ieee80211_tx(sdata, NULL, skb, true); 4794 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4795 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4796 dev_kfree_skb(skb); 4797 return true; 4798 } 4799 4800 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4801 sta = NULL; 4802 4803 result = ieee80211_tx_8023(sdata, skb, sta, true); 4804 } else { 4805 struct sk_buff_head skbs; 4806 4807 __skb_queue_head_init(&skbs); 4808 __skb_queue_tail(&skbs, skb); 4809 4810 hdr = (struct ieee80211_hdr *)skb->data; 4811 sta = sta_info_get(sdata, hdr->addr1); 4812 4813 result = __ieee80211_tx(local, &skbs, sta, true); 4814 } 4815 4816 return result; 4817 } 4818 4819 /* 4820 * Transmit all pending packets. Called from tasklet. 4821 */ 4822 void ieee80211_tx_pending(struct tasklet_struct *t) 4823 { 4824 struct ieee80211_local *local = from_tasklet(local, t, 4825 tx_pending_tasklet); 4826 unsigned long flags; 4827 int i; 4828 bool txok; 4829 4830 rcu_read_lock(); 4831 4832 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4833 for (i = 0; i < local->hw.queues; i++) { 4834 /* 4835 * If queue is stopped by something other than due to pending 4836 * frames, or we have no pending frames, proceed to next queue. 4837 */ 4838 if (local->queue_stop_reasons[i] || 4839 skb_queue_empty(&local->pending[i])) 4840 continue; 4841 4842 while (!skb_queue_empty(&local->pending[i])) { 4843 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4844 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4845 4846 if (WARN_ON(!info->control.vif)) { 4847 ieee80211_free_txskb(&local->hw, skb); 4848 continue; 4849 } 4850 4851 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4852 flags); 4853 4854 txok = ieee80211_tx_pending_skb(local, skb); 4855 spin_lock_irqsave(&local->queue_stop_reason_lock, 4856 flags); 4857 if (!txok) 4858 break; 4859 } 4860 } 4861 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4862 4863 rcu_read_unlock(); 4864 } 4865 4866 /* functions for drivers to get certain frames */ 4867 4868 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4869 struct ieee80211_link_data *link, 4870 struct ps_data *ps, struct sk_buff *skb, 4871 bool is_template) 4872 { 4873 u8 *pos, *tim; 4874 int aid0 = 0; 4875 int i, have_bits = 0, n1, n2; 4876 struct ieee80211_bss_conf *link_conf = link->conf; 4877 4878 /* Generate bitmap for TIM only if there are any STAs in power save 4879 * mode. */ 4880 if (atomic_read(&ps->num_sta_ps) > 0) 4881 /* in the hope that this is faster than 4882 * checking byte-for-byte */ 4883 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4884 IEEE80211_MAX_AID+1); 4885 if (!is_template) { 4886 if (ps->dtim_count == 0) 4887 ps->dtim_count = link_conf->dtim_period - 1; 4888 else 4889 ps->dtim_count--; 4890 } 4891 4892 tim = pos = skb_put(skb, 5); 4893 *pos++ = WLAN_EID_TIM; 4894 *pos++ = 3; 4895 *pos++ = ps->dtim_count; 4896 *pos++ = link_conf->dtim_period; 4897 4898 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4899 aid0 = 1; 4900 4901 ps->dtim_bc_mc = aid0 == 1; 4902 4903 if (have_bits) { 4904 /* Find largest even number N1 so that bits numbered 1 through 4905 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4906 * (N2 + 1) x 8 through 2007 are 0. */ 4907 n1 = 0; 4908 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4909 if (ps->tim[i]) { 4910 n1 = i & 0xfe; 4911 break; 4912 } 4913 } 4914 n2 = n1; 4915 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4916 if (ps->tim[i]) { 4917 n2 = i; 4918 break; 4919 } 4920 } 4921 4922 /* Bitmap control */ 4923 *pos++ = n1 | aid0; 4924 /* Part Virt Bitmap */ 4925 skb_put_data(skb, ps->tim + n1, n2 - n1 + 1); 4926 4927 tim[1] = n2 - n1 + 4; 4928 } else { 4929 *pos++ = aid0; /* Bitmap control */ 4930 4931 if (ieee80211_get_link_sband(link)->band != NL80211_BAND_S1GHZ) { 4932 tim[1] = 4; 4933 /* Part Virt Bitmap */ 4934 skb_put_u8(skb, 0); 4935 } 4936 } 4937 } 4938 4939 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4940 struct ieee80211_link_data *link, 4941 struct ps_data *ps, struct sk_buff *skb, 4942 bool is_template) 4943 { 4944 struct ieee80211_local *local = sdata->local; 4945 4946 /* 4947 * Not very nice, but we want to allow the driver to call 4948 * ieee80211_beacon_get() as a response to the set_tim() 4949 * callback. That, however, is already invoked under the 4950 * sta_lock to guarantee consistent and race-free update 4951 * of the tim bitmap in mac80211 and the driver. 4952 */ 4953 if (local->tim_in_locked_section) { 4954 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4955 } else { 4956 spin_lock_bh(&local->tim_lock); 4957 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4958 spin_unlock_bh(&local->tim_lock); 4959 } 4960 4961 return 0; 4962 } 4963 4964 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4965 struct beacon_data *beacon, 4966 struct ieee80211_link_data *link) 4967 { 4968 u8 *beacon_data, count, max_count = 1; 4969 struct probe_resp *resp; 4970 size_t beacon_data_len; 4971 u16 *bcn_offsets; 4972 int i; 4973 4974 switch (sdata->vif.type) { 4975 case NL80211_IFTYPE_AP: 4976 beacon_data = beacon->tail; 4977 beacon_data_len = beacon->tail_len; 4978 break; 4979 case NL80211_IFTYPE_ADHOC: 4980 beacon_data = beacon->head; 4981 beacon_data_len = beacon->head_len; 4982 break; 4983 case NL80211_IFTYPE_MESH_POINT: 4984 beacon_data = beacon->head; 4985 beacon_data_len = beacon->head_len; 4986 break; 4987 default: 4988 return; 4989 } 4990 4991 resp = rcu_dereference(link->u.ap.probe_resp); 4992 4993 bcn_offsets = beacon->cntdwn_counter_offsets; 4994 count = beacon->cntdwn_current_counter; 4995 if (link->conf->csa_active) 4996 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4997 4998 for (i = 0; i < max_count; ++i) { 4999 if (bcn_offsets[i]) { 5000 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 5001 return; 5002 beacon_data[bcn_offsets[i]] = count; 5003 } 5004 5005 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 5006 u16 *resp_offsets = resp->cntdwn_counter_offsets; 5007 5008 resp->data[resp_offsets[i]] = count; 5009 } 5010 } 5011 } 5012 5013 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 5014 { 5015 beacon->cntdwn_current_counter--; 5016 5017 /* the counter should never reach 0 */ 5018 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 5019 5020 return beacon->cntdwn_current_counter; 5021 } 5022 5023 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 5024 { 5025 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5026 struct beacon_data *beacon = NULL; 5027 u8 count = 0; 5028 5029 rcu_read_lock(); 5030 5031 if (sdata->vif.type == NL80211_IFTYPE_AP) 5032 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5033 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5034 beacon = rcu_dereference(sdata->u.ibss.presp); 5035 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5036 beacon = rcu_dereference(sdata->u.mesh.beacon); 5037 5038 if (!beacon) 5039 goto unlock; 5040 5041 count = __ieee80211_beacon_update_cntdwn(beacon); 5042 5043 unlock: 5044 rcu_read_unlock(); 5045 return count; 5046 } 5047 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 5048 5049 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 5050 { 5051 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5052 struct beacon_data *beacon = NULL; 5053 5054 rcu_read_lock(); 5055 5056 if (sdata->vif.type == NL80211_IFTYPE_AP) 5057 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5058 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 5059 beacon = rcu_dereference(sdata->u.ibss.presp); 5060 else if (ieee80211_vif_is_mesh(&sdata->vif)) 5061 beacon = rcu_dereference(sdata->u.mesh.beacon); 5062 5063 if (!beacon) 5064 goto unlock; 5065 5066 if (counter < beacon->cntdwn_current_counter) 5067 beacon->cntdwn_current_counter = counter; 5068 5069 unlock: 5070 rcu_read_unlock(); 5071 } 5072 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 5073 5074 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 5075 { 5076 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5077 struct beacon_data *beacon = NULL; 5078 u8 *beacon_data; 5079 size_t beacon_data_len; 5080 int ret = false; 5081 5082 if (!ieee80211_sdata_running(sdata)) 5083 return false; 5084 5085 rcu_read_lock(); 5086 if (vif->type == NL80211_IFTYPE_AP) { 5087 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 5088 if (WARN_ON(!beacon || !beacon->tail)) 5089 goto out; 5090 beacon_data = beacon->tail; 5091 beacon_data_len = beacon->tail_len; 5092 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 5093 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5094 5095 beacon = rcu_dereference(ifibss->presp); 5096 if (!beacon) 5097 goto out; 5098 5099 beacon_data = beacon->head; 5100 beacon_data_len = beacon->head_len; 5101 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 5102 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5103 5104 beacon = rcu_dereference(ifmsh->beacon); 5105 if (!beacon) 5106 goto out; 5107 5108 beacon_data = beacon->head; 5109 beacon_data_len = beacon->head_len; 5110 } else { 5111 WARN_ON(1); 5112 goto out; 5113 } 5114 5115 if (!beacon->cntdwn_counter_offsets[0]) 5116 goto out; 5117 5118 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5119 goto out; 5120 5121 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5122 ret = true; 5123 5124 out: 5125 rcu_read_unlock(); 5126 5127 return ret; 5128 } 5129 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5130 5131 static int ieee80211_beacon_protect(struct sk_buff *skb, 5132 struct ieee80211_local *local, 5133 struct ieee80211_sub_if_data *sdata, 5134 struct ieee80211_link_data *link) 5135 { 5136 ieee80211_tx_result res; 5137 struct ieee80211_tx_data tx; 5138 struct sk_buff *check_skb; 5139 5140 memset(&tx, 0, sizeof(tx)); 5141 tx.key = rcu_dereference(link->default_beacon_key); 5142 if (!tx.key) 5143 return 0; 5144 5145 if (unlikely(tx.key->flags & KEY_FLAG_TAINTED)) { 5146 tx.key = NULL; 5147 return -EINVAL; 5148 } 5149 5150 if (!(tx.key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && 5151 tx.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 5152 IEEE80211_SKB_CB(skb)->control.hw_key = &tx.key->conf; 5153 5154 tx.local = local; 5155 tx.sdata = sdata; 5156 __skb_queue_head_init(&tx.skbs); 5157 __skb_queue_tail(&tx.skbs, skb); 5158 res = ieee80211_tx_h_encrypt(&tx); 5159 check_skb = __skb_dequeue(&tx.skbs); 5160 /* we may crash after this, but it'd be a bug in crypto */ 5161 WARN_ON(check_skb != skb); 5162 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5163 return -EINVAL; 5164 5165 return 0; 5166 } 5167 5168 static void 5169 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5170 struct ieee80211_vif *vif, 5171 struct ieee80211_link_data *link, 5172 struct ieee80211_mutable_offsets *offs, 5173 struct beacon_data *beacon, 5174 struct sk_buff *skb, 5175 struct ieee80211_chanctx_conf *chanctx_conf, 5176 u16 csa_off_base) 5177 { 5178 struct ieee80211_local *local = hw_to_local(hw); 5179 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5180 struct ieee80211_tx_info *info; 5181 enum nl80211_band band; 5182 struct ieee80211_tx_rate_control txrc; 5183 5184 /* CSA offsets */ 5185 if (offs && beacon) { 5186 u16 i; 5187 5188 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5189 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5190 5191 if (!csa_off) 5192 continue; 5193 5194 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5195 } 5196 } 5197 5198 band = chanctx_conf->def.chan->band; 5199 info = IEEE80211_SKB_CB(skb); 5200 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5201 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5202 info->band = band; 5203 5204 memset(&txrc, 0, sizeof(txrc)); 5205 txrc.hw = hw; 5206 txrc.sband = local->hw.wiphy->bands[band]; 5207 txrc.bss_conf = link->conf; 5208 txrc.skb = skb; 5209 txrc.reported_rate.idx = -1; 5210 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5211 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5212 else 5213 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5214 txrc.bss = true; 5215 rate_control_get_rate(sdata, NULL, &txrc); 5216 5217 info->control.vif = vif; 5218 info->control.flags |= u32_encode_bits(link->link_id, 5219 IEEE80211_TX_CTRL_MLO_LINK); 5220 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5221 IEEE80211_TX_CTL_ASSIGN_SEQ | 5222 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5223 } 5224 5225 static void 5226 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon, 5227 u8 i) 5228 { 5229 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt || 5230 i > beacon->mbssid_ies->cnt) 5231 return; 5232 5233 if (i < beacon->mbssid_ies->cnt) { 5234 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5235 beacon->mbssid_ies->elem[i].len); 5236 5237 if (beacon->rnr_ies && beacon->rnr_ies->cnt) { 5238 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5239 beacon->rnr_ies->elem[i].len); 5240 5241 for (i = beacon->mbssid_ies->cnt; i < beacon->rnr_ies->cnt; i++) 5242 skb_put_data(skb, beacon->rnr_ies->elem[i].data, 5243 beacon->rnr_ies->elem[i].len); 5244 } 5245 return; 5246 } 5247 5248 /* i == beacon->mbssid_ies->cnt, include all MBSSID elements */ 5249 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5250 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5251 beacon->mbssid_ies->elem[i].len); 5252 } 5253 5254 static struct sk_buff * 5255 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5256 struct ieee80211_vif *vif, 5257 struct ieee80211_link_data *link, 5258 struct ieee80211_mutable_offsets *offs, 5259 bool is_template, 5260 struct beacon_data *beacon, 5261 struct ieee80211_chanctx_conf *chanctx_conf, 5262 u8 ema_index) 5263 { 5264 struct ieee80211_local *local = hw_to_local(hw); 5265 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5266 struct ieee80211_if_ap *ap = &sdata->u.ap; 5267 struct sk_buff *skb = NULL; 5268 u16 csa_off_base = 0; 5269 int mbssid_len; 5270 5271 if (beacon->cntdwn_counter_offsets[0]) { 5272 if (!is_template) 5273 ieee80211_beacon_update_cntdwn(vif); 5274 5275 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5276 } 5277 5278 /* headroom, head length, 5279 * tail length, maximum TIM length and multiple BSSID length 5280 */ 5281 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies, 5282 beacon->rnr_ies, 5283 ema_index); 5284 5285 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5286 beacon->tail_len + 256 + 5287 local->hw.extra_beacon_tailroom + mbssid_len); 5288 if (!skb) 5289 return NULL; 5290 5291 skb_reserve(skb, local->tx_headroom); 5292 skb_put_data(skb, beacon->head, beacon->head_len); 5293 5294 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5295 5296 if (offs) { 5297 offs->tim_offset = beacon->head_len; 5298 offs->tim_length = skb->len - beacon->head_len; 5299 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5300 5301 if (mbssid_len) { 5302 ieee80211_beacon_add_mbssid(skb, beacon, ema_index); 5303 offs->mbssid_off = skb->len - mbssid_len; 5304 } 5305 5306 /* for AP the csa offsets are from tail */ 5307 csa_off_base = skb->len; 5308 } 5309 5310 if (beacon->tail) 5311 skb_put_data(skb, beacon->tail, beacon->tail_len); 5312 5313 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5314 return NULL; 5315 5316 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5317 chanctx_conf, csa_off_base); 5318 return skb; 5319 } 5320 5321 static struct ieee80211_ema_beacons * 5322 ieee80211_beacon_get_ap_ema_list(struct ieee80211_hw *hw, 5323 struct ieee80211_vif *vif, 5324 struct ieee80211_link_data *link, 5325 struct ieee80211_mutable_offsets *offs, 5326 bool is_template, struct beacon_data *beacon, 5327 struct ieee80211_chanctx_conf *chanctx_conf) 5328 { 5329 struct ieee80211_ema_beacons *ema = NULL; 5330 5331 if (!beacon->mbssid_ies || !beacon->mbssid_ies->cnt) 5332 return NULL; 5333 5334 ema = kzalloc(struct_size(ema, bcn, beacon->mbssid_ies->cnt), 5335 GFP_ATOMIC); 5336 if (!ema) 5337 return NULL; 5338 5339 for (ema->cnt = 0; ema->cnt < beacon->mbssid_ies->cnt; ema->cnt++) { 5340 ema->bcn[ema->cnt].skb = 5341 ieee80211_beacon_get_ap(hw, vif, link, 5342 &ema->bcn[ema->cnt].offs, 5343 is_template, beacon, 5344 chanctx_conf, ema->cnt); 5345 if (!ema->bcn[ema->cnt].skb) 5346 break; 5347 } 5348 5349 if (ema->cnt == beacon->mbssid_ies->cnt) 5350 return ema; 5351 5352 ieee80211_beacon_free_ema_list(ema); 5353 return NULL; 5354 } 5355 5356 #define IEEE80211_INCLUDE_ALL_MBSSID_ELEMS -1 5357 5358 static struct sk_buff * 5359 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5360 struct ieee80211_vif *vif, 5361 struct ieee80211_mutable_offsets *offs, 5362 bool is_template, 5363 unsigned int link_id, 5364 int ema_index, 5365 struct ieee80211_ema_beacons **ema_beacons) 5366 { 5367 struct ieee80211_local *local = hw_to_local(hw); 5368 struct beacon_data *beacon = NULL; 5369 struct sk_buff *skb = NULL; 5370 struct ieee80211_sub_if_data *sdata = NULL; 5371 struct ieee80211_chanctx_conf *chanctx_conf; 5372 struct ieee80211_link_data *link; 5373 5374 rcu_read_lock(); 5375 5376 sdata = vif_to_sdata(vif); 5377 link = rcu_dereference(sdata->link[link_id]); 5378 if (!link) 5379 goto out; 5380 chanctx_conf = 5381 rcu_dereference(link->conf->chanctx_conf); 5382 5383 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5384 goto out; 5385 5386 if (offs) 5387 memset(offs, 0, sizeof(*offs)); 5388 5389 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5390 beacon = rcu_dereference(link->u.ap.beacon); 5391 if (!beacon) 5392 goto out; 5393 5394 if (ema_beacons) { 5395 *ema_beacons = 5396 ieee80211_beacon_get_ap_ema_list(hw, vif, link, 5397 offs, 5398 is_template, 5399 beacon, 5400 chanctx_conf); 5401 } else { 5402 if (beacon->mbssid_ies && beacon->mbssid_ies->cnt) { 5403 if (ema_index >= beacon->mbssid_ies->cnt) 5404 goto out; /* End of MBSSID elements */ 5405 5406 if (ema_index <= IEEE80211_INCLUDE_ALL_MBSSID_ELEMS) 5407 ema_index = beacon->mbssid_ies->cnt; 5408 } else { 5409 ema_index = 0; 5410 } 5411 5412 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, 5413 is_template, beacon, 5414 chanctx_conf, 5415 ema_index); 5416 } 5417 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5418 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5419 struct ieee80211_hdr *hdr; 5420 5421 beacon = rcu_dereference(ifibss->presp); 5422 if (!beacon) 5423 goto out; 5424 5425 if (beacon->cntdwn_counter_offsets[0]) { 5426 if (!is_template) 5427 __ieee80211_beacon_update_cntdwn(beacon); 5428 5429 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5430 } 5431 5432 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5433 local->hw.extra_beacon_tailroom); 5434 if (!skb) 5435 goto out; 5436 skb_reserve(skb, local->tx_headroom); 5437 skb_put_data(skb, beacon->head, beacon->head_len); 5438 5439 hdr = (struct ieee80211_hdr *) skb->data; 5440 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5441 IEEE80211_STYPE_BEACON); 5442 5443 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5444 chanctx_conf, 0); 5445 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5446 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5447 5448 beacon = rcu_dereference(ifmsh->beacon); 5449 if (!beacon) 5450 goto out; 5451 5452 if (beacon->cntdwn_counter_offsets[0]) { 5453 if (!is_template) 5454 /* TODO: For mesh csa_counter is in TU, so 5455 * decrementing it by one isn't correct, but 5456 * for now we leave it consistent with overall 5457 * mac80211's behavior. 5458 */ 5459 __ieee80211_beacon_update_cntdwn(beacon); 5460 5461 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5462 } 5463 5464 if (ifmsh->sync_ops) 5465 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5466 5467 skb = dev_alloc_skb(local->tx_headroom + 5468 beacon->head_len + 5469 256 + /* TIM IE */ 5470 beacon->tail_len + 5471 local->hw.extra_beacon_tailroom); 5472 if (!skb) 5473 goto out; 5474 skb_reserve(skb, local->tx_headroom); 5475 skb_put_data(skb, beacon->head, beacon->head_len); 5476 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5477 is_template); 5478 5479 if (offs) { 5480 offs->tim_offset = beacon->head_len; 5481 offs->tim_length = skb->len - beacon->head_len; 5482 } 5483 5484 skb_put_data(skb, beacon->tail, beacon->tail_len); 5485 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5486 chanctx_conf, 0); 5487 } else { 5488 WARN_ON(1); 5489 goto out; 5490 } 5491 5492 out: 5493 rcu_read_unlock(); 5494 return skb; 5495 5496 } 5497 5498 struct sk_buff * 5499 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5500 struct ieee80211_vif *vif, 5501 struct ieee80211_mutable_offsets *offs, 5502 unsigned int link_id) 5503 { 5504 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, 5505 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, NULL); 5506 } 5507 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5508 5509 struct sk_buff * 5510 ieee80211_beacon_get_template_ema_index(struct ieee80211_hw *hw, 5511 struct ieee80211_vif *vif, 5512 struct ieee80211_mutable_offsets *offs, 5513 unsigned int link_id, u8 ema_index) 5514 { 5515 return __ieee80211_beacon_get(hw, vif, offs, true, link_id, ema_index, 5516 NULL); 5517 } 5518 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_index); 5519 5520 void ieee80211_beacon_free_ema_list(struct ieee80211_ema_beacons *ema_beacons) 5521 { 5522 u8 i; 5523 5524 if (!ema_beacons) 5525 return; 5526 5527 for (i = 0; i < ema_beacons->cnt; i++) 5528 kfree_skb(ema_beacons->bcn[i].skb); 5529 5530 kfree(ema_beacons); 5531 } 5532 EXPORT_SYMBOL(ieee80211_beacon_free_ema_list); 5533 5534 struct ieee80211_ema_beacons * 5535 ieee80211_beacon_get_template_ema_list(struct ieee80211_hw *hw, 5536 struct ieee80211_vif *vif, 5537 unsigned int link_id) 5538 { 5539 struct ieee80211_ema_beacons *ema_beacons = NULL; 5540 5541 WARN_ON(__ieee80211_beacon_get(hw, vif, NULL, true, link_id, 0, 5542 &ema_beacons)); 5543 5544 return ema_beacons; 5545 } 5546 EXPORT_SYMBOL(ieee80211_beacon_get_template_ema_list); 5547 5548 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5549 struct ieee80211_vif *vif, 5550 u16 *tim_offset, u16 *tim_length, 5551 unsigned int link_id) 5552 { 5553 struct ieee80211_mutable_offsets offs = {}; 5554 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5555 link_id, 5556 IEEE80211_INCLUDE_ALL_MBSSID_ELEMS, 5557 NULL); 5558 struct sk_buff *copy; 5559 int shift; 5560 5561 if (!bcn) 5562 return bcn; 5563 5564 if (tim_offset) 5565 *tim_offset = offs.tim_offset; 5566 5567 if (tim_length) 5568 *tim_length = offs.tim_length; 5569 5570 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5571 !hw_to_local(hw)->monitors) 5572 return bcn; 5573 5574 /* send a copy to monitor interfaces */ 5575 copy = skb_copy(bcn, GFP_ATOMIC); 5576 if (!copy) 5577 return bcn; 5578 5579 shift = ieee80211_vif_get_shift(vif); 5580 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5581 5582 return bcn; 5583 } 5584 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5585 5586 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5587 struct ieee80211_vif *vif) 5588 { 5589 struct sk_buff *skb = NULL; 5590 struct probe_resp *presp = NULL; 5591 struct ieee80211_hdr *hdr; 5592 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5593 5594 if (sdata->vif.type != NL80211_IFTYPE_AP) 5595 return NULL; 5596 5597 rcu_read_lock(); 5598 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5599 if (!presp) 5600 goto out; 5601 5602 skb = dev_alloc_skb(presp->len); 5603 if (!skb) 5604 goto out; 5605 5606 skb_put_data(skb, presp->data, presp->len); 5607 5608 hdr = (struct ieee80211_hdr *) skb->data; 5609 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5610 5611 out: 5612 rcu_read_unlock(); 5613 return skb; 5614 } 5615 EXPORT_SYMBOL(ieee80211_proberesp_get); 5616 5617 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5618 struct ieee80211_vif *vif) 5619 { 5620 struct sk_buff *skb = NULL; 5621 struct fils_discovery_data *tmpl = NULL; 5622 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5623 5624 if (sdata->vif.type != NL80211_IFTYPE_AP) 5625 return NULL; 5626 5627 rcu_read_lock(); 5628 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5629 if (!tmpl) { 5630 rcu_read_unlock(); 5631 return NULL; 5632 } 5633 5634 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5635 if (skb) { 5636 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5637 skb_put_data(skb, tmpl->data, tmpl->len); 5638 } 5639 5640 rcu_read_unlock(); 5641 return skb; 5642 } 5643 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5644 5645 struct sk_buff * 5646 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5647 struct ieee80211_vif *vif) 5648 { 5649 struct sk_buff *skb = NULL; 5650 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5651 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5652 5653 if (sdata->vif.type != NL80211_IFTYPE_AP) 5654 return NULL; 5655 5656 rcu_read_lock(); 5657 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5658 if (!tmpl) { 5659 rcu_read_unlock(); 5660 return NULL; 5661 } 5662 5663 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5664 if (skb) { 5665 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5666 skb_put_data(skb, tmpl->data, tmpl->len); 5667 } 5668 5669 rcu_read_unlock(); 5670 return skb; 5671 } 5672 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5673 5674 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5675 struct ieee80211_vif *vif) 5676 { 5677 struct ieee80211_sub_if_data *sdata; 5678 struct ieee80211_pspoll *pspoll; 5679 struct ieee80211_local *local; 5680 struct sk_buff *skb; 5681 5682 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5683 return NULL; 5684 5685 sdata = vif_to_sdata(vif); 5686 local = sdata->local; 5687 5688 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5689 if (!skb) 5690 return NULL; 5691 5692 skb_reserve(skb, local->hw.extra_tx_headroom); 5693 5694 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5695 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5696 IEEE80211_STYPE_PSPOLL); 5697 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5698 5699 /* aid in PS-Poll has its two MSBs each set to 1 */ 5700 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5701 5702 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5703 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5704 5705 return skb; 5706 } 5707 EXPORT_SYMBOL(ieee80211_pspoll_get); 5708 5709 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5710 struct ieee80211_vif *vif, 5711 int link_id, bool qos_ok) 5712 { 5713 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5714 struct ieee80211_local *local = sdata->local; 5715 struct ieee80211_link_data *link = NULL; 5716 struct ieee80211_hdr_3addr *nullfunc; 5717 struct sk_buff *skb; 5718 bool qos = false; 5719 5720 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5721 return NULL; 5722 5723 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5724 sizeof(*nullfunc) + 2); 5725 if (!skb) 5726 return NULL; 5727 5728 rcu_read_lock(); 5729 if (qos_ok) { 5730 struct sta_info *sta; 5731 5732 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5733 qos = sta && sta->sta.wme; 5734 } 5735 5736 if (link_id >= 0) { 5737 link = rcu_dereference(sdata->link[link_id]); 5738 if (WARN_ON_ONCE(!link)) { 5739 rcu_read_unlock(); 5740 kfree_skb(skb); 5741 return NULL; 5742 } 5743 } 5744 5745 skb_reserve(skb, local->hw.extra_tx_headroom); 5746 5747 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5748 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5749 IEEE80211_STYPE_NULLFUNC | 5750 IEEE80211_FCTL_TODS); 5751 if (qos) { 5752 __le16 qoshdr = cpu_to_le16(7); 5753 5754 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5755 IEEE80211_STYPE_NULLFUNC) != 5756 IEEE80211_STYPE_QOS_NULLFUNC); 5757 nullfunc->frame_control |= 5758 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5759 skb->priority = 7; 5760 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5761 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5762 } 5763 5764 if (link) { 5765 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5766 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5767 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5768 } else { 5769 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5770 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5771 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5772 } 5773 rcu_read_unlock(); 5774 5775 return skb; 5776 } 5777 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5778 5779 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5780 const u8 *src_addr, 5781 const u8 *ssid, size_t ssid_len, 5782 size_t tailroom) 5783 { 5784 struct ieee80211_local *local = hw_to_local(hw); 5785 struct ieee80211_hdr_3addr *hdr; 5786 struct sk_buff *skb; 5787 size_t ie_ssid_len; 5788 u8 *pos; 5789 5790 ie_ssid_len = 2 + ssid_len; 5791 5792 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5793 ie_ssid_len + tailroom); 5794 if (!skb) 5795 return NULL; 5796 5797 skb_reserve(skb, local->hw.extra_tx_headroom); 5798 5799 hdr = skb_put_zero(skb, sizeof(*hdr)); 5800 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5801 IEEE80211_STYPE_PROBE_REQ); 5802 eth_broadcast_addr(hdr->addr1); 5803 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5804 eth_broadcast_addr(hdr->addr3); 5805 5806 pos = skb_put(skb, ie_ssid_len); 5807 *pos++ = WLAN_EID_SSID; 5808 *pos++ = ssid_len; 5809 if (ssid_len) 5810 memcpy(pos, ssid, ssid_len); 5811 pos += ssid_len; 5812 5813 return skb; 5814 } 5815 EXPORT_SYMBOL(ieee80211_probereq_get); 5816 5817 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5818 const void *frame, size_t frame_len, 5819 const struct ieee80211_tx_info *frame_txctl, 5820 struct ieee80211_rts *rts) 5821 { 5822 const struct ieee80211_hdr *hdr = frame; 5823 5824 rts->frame_control = 5825 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5826 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5827 frame_txctl); 5828 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5829 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5830 } 5831 EXPORT_SYMBOL(ieee80211_rts_get); 5832 5833 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5834 const void *frame, size_t frame_len, 5835 const struct ieee80211_tx_info *frame_txctl, 5836 struct ieee80211_cts *cts) 5837 { 5838 const struct ieee80211_hdr *hdr = frame; 5839 5840 cts->frame_control = 5841 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5842 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5843 frame_len, frame_txctl); 5844 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5845 } 5846 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5847 5848 struct sk_buff * 5849 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5850 struct ieee80211_vif *vif) 5851 { 5852 struct ieee80211_local *local = hw_to_local(hw); 5853 struct sk_buff *skb = NULL; 5854 struct ieee80211_tx_data tx; 5855 struct ieee80211_sub_if_data *sdata; 5856 struct ps_data *ps; 5857 struct ieee80211_tx_info *info; 5858 struct ieee80211_chanctx_conf *chanctx_conf; 5859 5860 sdata = vif_to_sdata(vif); 5861 5862 rcu_read_lock(); 5863 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5864 5865 if (!chanctx_conf) 5866 goto out; 5867 5868 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5869 struct beacon_data *beacon = 5870 rcu_dereference(sdata->deflink.u.ap.beacon); 5871 5872 if (!beacon || !beacon->head) 5873 goto out; 5874 5875 ps = &sdata->u.ap.ps; 5876 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5877 ps = &sdata->u.mesh.ps; 5878 } else { 5879 goto out; 5880 } 5881 5882 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5883 goto out; /* send buffered bc/mc only after DTIM beacon */ 5884 5885 while (1) { 5886 skb = skb_dequeue(&ps->bc_buf); 5887 if (!skb) 5888 goto out; 5889 local->total_ps_buffered--; 5890 5891 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5892 struct ieee80211_hdr *hdr = 5893 (struct ieee80211_hdr *) skb->data; 5894 /* more buffered multicast/broadcast frames ==> set 5895 * MoreData flag in IEEE 802.11 header to inform PS 5896 * STAs */ 5897 hdr->frame_control |= 5898 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5899 } 5900 5901 if (sdata->vif.type == NL80211_IFTYPE_AP) 5902 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5903 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5904 break; 5905 ieee80211_free_txskb(hw, skb); 5906 } 5907 5908 info = IEEE80211_SKB_CB(skb); 5909 5910 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5911 info->band = chanctx_conf->def.chan->band; 5912 5913 if (invoke_tx_handlers(&tx)) 5914 skb = NULL; 5915 out: 5916 rcu_read_unlock(); 5917 5918 return skb; 5919 } 5920 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5921 5922 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5923 { 5924 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5925 struct ieee80211_sub_if_data *sdata = sta->sdata; 5926 struct ieee80211_local *local = sdata->local; 5927 int ret; 5928 u32 queues; 5929 5930 lockdep_assert_wiphy(local->hw.wiphy); 5931 5932 /* only some cases are supported right now */ 5933 switch (sdata->vif.type) { 5934 case NL80211_IFTYPE_STATION: 5935 case NL80211_IFTYPE_AP: 5936 case NL80211_IFTYPE_AP_VLAN: 5937 break; 5938 default: 5939 WARN_ON(1); 5940 return -EINVAL; 5941 } 5942 5943 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5944 return -EINVAL; 5945 5946 if (sta->reserved_tid == tid) { 5947 ret = 0; 5948 goto out; 5949 } 5950 5951 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5952 sdata_err(sdata, "TID reservation already active\n"); 5953 ret = -EALREADY; 5954 goto out; 5955 } 5956 5957 ieee80211_stop_vif_queues(sdata->local, sdata, 5958 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5959 5960 synchronize_net(); 5961 5962 /* Tear down BA sessions so we stop aggregating on this TID */ 5963 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5964 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5965 __ieee80211_stop_tx_ba_session(sta, tid, 5966 AGG_STOP_LOCAL_REQUEST); 5967 } 5968 5969 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5970 __ieee80211_flush_queues(local, sdata, queues, false); 5971 5972 sta->reserved_tid = tid; 5973 5974 ieee80211_wake_vif_queues(local, sdata, 5975 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5976 5977 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5978 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5979 5980 ret = 0; 5981 out: 5982 return ret; 5983 } 5984 EXPORT_SYMBOL(ieee80211_reserve_tid); 5985 5986 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5987 { 5988 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5989 struct ieee80211_sub_if_data *sdata = sta->sdata; 5990 5991 lockdep_assert_wiphy(sdata->local->hw.wiphy); 5992 5993 /* only some cases are supported right now */ 5994 switch (sdata->vif.type) { 5995 case NL80211_IFTYPE_STATION: 5996 case NL80211_IFTYPE_AP: 5997 case NL80211_IFTYPE_AP_VLAN: 5998 break; 5999 default: 6000 WARN_ON(1); 6001 return; 6002 } 6003 6004 if (tid != sta->reserved_tid) { 6005 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 6006 return; 6007 } 6008 6009 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 6010 } 6011 EXPORT_SYMBOL(ieee80211_unreserve_tid); 6012 6013 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 6014 struct sk_buff *skb, int tid, int link_id, 6015 enum nl80211_band band) 6016 { 6017 const struct ieee80211_hdr *hdr = (void *)skb->data; 6018 int ac = ieee80211_ac_from_tid(tid); 6019 unsigned int link; 6020 6021 skb_reset_mac_header(skb); 6022 skb_set_queue_mapping(skb, ac); 6023 skb->priority = tid; 6024 6025 skb->dev = sdata->dev; 6026 6027 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 6028 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 6029 IEEE80211_LINK_UNSPECIFIED)); 6030 6031 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6032 link = 0; 6033 } else if (link_id >= 0) { 6034 link = link_id; 6035 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 6036 /* address from the MLD */ 6037 link = IEEE80211_LINK_UNSPECIFIED; 6038 } else { 6039 /* otherwise must be addressed from a link */ 6040 rcu_read_lock(); 6041 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 6042 struct ieee80211_bss_conf *link_conf; 6043 6044 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 6045 if (!link_conf) 6046 continue; 6047 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 6048 break; 6049 } 6050 rcu_read_unlock(); 6051 6052 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 6053 link = ffs(sdata->vif.active_links) - 1; 6054 } 6055 6056 IEEE80211_SKB_CB(skb)->control.flags |= 6057 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 6058 6059 /* 6060 * The other path calling ieee80211_xmit is from the tasklet, 6061 * and while we can handle concurrent transmissions locking 6062 * requirements are that we do not come into tx with bhs on. 6063 */ 6064 local_bh_disable(); 6065 IEEE80211_SKB_CB(skb)->band = band; 6066 ieee80211_xmit(sdata, NULL, skb); 6067 local_bh_enable(); 6068 } 6069 6070 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 6071 struct sk_buff *skb, int tid, int link_id) 6072 { 6073 struct ieee80211_chanctx_conf *chanctx_conf; 6074 enum nl80211_band band; 6075 6076 rcu_read_lock(); 6077 if (!ieee80211_vif_is_mld(&sdata->vif)) { 6078 WARN_ON(link_id >= 0); 6079 chanctx_conf = 6080 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 6081 if (WARN_ON(!chanctx_conf)) { 6082 rcu_read_unlock(); 6083 kfree_skb(skb); 6084 return; 6085 } 6086 band = chanctx_conf->def.chan->band; 6087 } else { 6088 WARN_ON(link_id >= 0 && 6089 !(sdata->vif.active_links & BIT(link_id))); 6090 /* MLD transmissions must not rely on the band */ 6091 band = 0; 6092 } 6093 6094 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 6095 rcu_read_unlock(); 6096 } 6097 6098 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 6099 const u8 *buf, size_t len, 6100 const u8 *dest, __be16 proto, bool unencrypted, 6101 int link_id, u64 *cookie) 6102 { 6103 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6104 struct ieee80211_local *local = sdata->local; 6105 struct sta_info *sta; 6106 struct sk_buff *skb; 6107 struct ethhdr *ehdr; 6108 u32 ctrl_flags = 0; 6109 u32 flags = 0; 6110 int err; 6111 6112 /* mutex lock is only needed for incrementing the cookie counter */ 6113 lockdep_assert_wiphy(local->hw.wiphy); 6114 6115 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 6116 * or Pre-Authentication 6117 */ 6118 if (proto != sdata->control_port_protocol && 6119 proto != cpu_to_be16(ETH_P_PREAUTH)) 6120 return -EINVAL; 6121 6122 if (proto == sdata->control_port_protocol) 6123 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 6124 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 6125 6126 if (unencrypted) 6127 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 6128 6129 if (cookie) 6130 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 6131 6132 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 6133 6134 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 6135 sizeof(struct ethhdr) + len); 6136 if (!skb) 6137 return -ENOMEM; 6138 6139 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 6140 6141 skb_put_data(skb, buf, len); 6142 6143 ehdr = skb_push(skb, sizeof(struct ethhdr)); 6144 memcpy(ehdr->h_dest, dest, ETH_ALEN); 6145 6146 /* we may override the SA for MLO STA later */ 6147 if (link_id < 0) { 6148 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 6149 IEEE80211_TX_CTRL_MLO_LINK); 6150 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6151 } else { 6152 struct ieee80211_bss_conf *link_conf; 6153 6154 ctrl_flags |= u32_encode_bits(link_id, 6155 IEEE80211_TX_CTRL_MLO_LINK); 6156 6157 rcu_read_lock(); 6158 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 6159 if (!link_conf) { 6160 dev_kfree_skb(skb); 6161 rcu_read_unlock(); 6162 return -ENOLINK; 6163 } 6164 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 6165 rcu_read_unlock(); 6166 } 6167 6168 ehdr->h_proto = proto; 6169 6170 skb->dev = dev; 6171 skb->protocol = proto; 6172 skb_reset_network_header(skb); 6173 skb_reset_mac_header(skb); 6174 6175 if (local->hw.queues < IEEE80211_NUM_ACS) 6176 goto start_xmit; 6177 6178 /* update QoS header to prioritize control port frames if possible, 6179 * priorization also happens for control port frames send over 6180 * AF_PACKET 6181 */ 6182 rcu_read_lock(); 6183 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 6184 if (err) { 6185 dev_kfree_skb(skb); 6186 rcu_read_unlock(); 6187 return err; 6188 } 6189 6190 if (!IS_ERR(sta)) { 6191 u16 queue = ieee80211_select_queue(sdata, sta, skb); 6192 6193 skb_set_queue_mapping(skb, queue); 6194 6195 /* 6196 * for MLO STA, the SA should be the AP MLD address, but 6197 * the link ID has been selected already 6198 */ 6199 if (sta && sta->sta.mlo) 6200 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 6201 } 6202 rcu_read_unlock(); 6203 6204 start_xmit: 6205 local_bh_disable(); 6206 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 6207 local_bh_enable(); 6208 6209 return 0; 6210 } 6211 6212 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 6213 const u8 *buf, size_t len) 6214 { 6215 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 6216 struct ieee80211_local *local = sdata->local; 6217 struct sk_buff *skb; 6218 6219 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 6220 30 + /* header size */ 6221 18); /* 11s header size */ 6222 if (!skb) 6223 return -ENOMEM; 6224 6225 skb_reserve(skb, local->hw.extra_tx_headroom); 6226 skb_put_data(skb, buf, len); 6227 6228 skb->dev = dev; 6229 skb->protocol = htons(ETH_P_802_3); 6230 skb_reset_network_header(skb); 6231 skb_reset_mac_header(skb); 6232 6233 local_bh_disable(); 6234 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6235 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6236 NULL); 6237 local_bh_enable(); 6238 6239 return 0; 6240 } 6241