1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2022 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 42 struct sk_buff *skb, int group_addr, 43 int next_frag_len) 44 { 45 int rate, mrate, erp, dur, i, shift = 0; 46 struct ieee80211_rate *txrate; 47 struct ieee80211_local *local = tx->local; 48 struct ieee80211_supported_band *sband; 49 struct ieee80211_hdr *hdr; 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 51 struct ieee80211_chanctx_conf *chanctx_conf; 52 u32 rate_flags = 0; 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 rcu_read_lock(); 59 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 60 if (chanctx_conf) { 61 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 } 64 rcu_read_unlock(); 65 66 /* uh huh? */ 67 if (WARN_ON_ONCE(tx->rate.idx < 0)) 68 return 0; 69 70 sband = local->hw.wiphy->bands[info->band]; 71 txrate = &sband->bitrates[tx->rate.idx]; 72 73 erp = txrate->flags & IEEE80211_RATE_ERP_G; 74 75 /* device is expected to do this */ 76 if (sband->band == NL80211_BAND_S1GHZ) 77 return 0; 78 79 /* 80 * data and mgmt (except PS Poll): 81 * - during CFP: 32768 82 * - during contention period: 83 * if addr1 is group address: 0 84 * if more fragments = 0 and addr1 is individual address: time to 85 * transmit one ACK plus SIFS 86 * if more fragments = 1 and addr1 is individual address: time to 87 * transmit next fragment plus 2 x ACK plus 3 x SIFS 88 * 89 * IEEE 802.11, 9.6: 90 * - control response frame (CTS or ACK) shall be transmitted using the 91 * same rate as the immediately previous frame in the frame exchange 92 * sequence, if this rate belongs to the PHY mandatory rates, or else 93 * at the highest possible rate belonging to the PHY rates in the 94 * BSSBasicRateSet 95 */ 96 hdr = (struct ieee80211_hdr *)skb->data; 97 if (ieee80211_is_ctl(hdr->frame_control)) { 98 /* TODO: These control frames are not currently sent by 99 * mac80211, but should they be implemented, this function 100 * needs to be updated to support duration field calculation. 101 * 102 * RTS: time needed to transmit pending data/mgmt frame plus 103 * one CTS frame plus one ACK frame plus 3 x SIFS 104 * CTS: duration of immediately previous RTS minus time 105 * required to transmit CTS and its SIFS 106 * ACK: 0 if immediately previous directed data/mgmt had 107 * more=0, with more=1 duration in ACK frame is duration 108 * from previous frame minus time needed to transmit ACK 109 * and its SIFS 110 * PS Poll: BIT(15) | BIT(14) | aid 111 */ 112 return 0; 113 } 114 115 /* data/mgmt */ 116 if (0 /* FIX: data/mgmt during CFP */) 117 return cpu_to_le16(32768); 118 119 if (group_addr) /* Group address as the destination - no ACK */ 120 return 0; 121 122 /* Individual destination address: 123 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 124 * CTS and ACK frames shall be transmitted using the highest rate in 125 * basic rate set that is less than or equal to the rate of the 126 * immediately previous frame and that is using the same modulation 127 * (CCK or OFDM). If no basic rate set matches with these requirements, 128 * the highest mandatory rate of the PHY that is less than or equal to 129 * the rate of the previous frame is used. 130 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 131 */ 132 rate = -1; 133 /* use lowest available if everything fails */ 134 mrate = sband->bitrates[0].bitrate; 135 for (i = 0; i < sband->n_bitrates; i++) { 136 struct ieee80211_rate *r = &sband->bitrates[i]; 137 138 if (r->bitrate > txrate->bitrate) 139 break; 140 141 if ((rate_flags & r->flags) != rate_flags) 142 continue; 143 144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 145 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 146 147 switch (sband->band) { 148 case NL80211_BAND_2GHZ: 149 case NL80211_BAND_LC: { 150 u32 flag; 151 if (tx->sdata->deflink.operating_11g_mode) 152 flag = IEEE80211_RATE_MANDATORY_G; 153 else 154 flag = IEEE80211_RATE_MANDATORY_B; 155 if (r->flags & flag) 156 mrate = r->bitrate; 157 break; 158 } 159 case NL80211_BAND_5GHZ: 160 case NL80211_BAND_6GHZ: 161 if (r->flags & IEEE80211_RATE_MANDATORY_A) 162 mrate = r->bitrate; 163 break; 164 case NL80211_BAND_S1GHZ: 165 case NL80211_BAND_60GHZ: 166 /* TODO, for now fall through */ 167 case NUM_NL80211_BANDS: 168 WARN_ON(1); 169 break; 170 } 171 } 172 if (rate == -1) { 173 /* No matching basic rate found; use highest suitable mandatory 174 * PHY rate */ 175 rate = DIV_ROUND_UP(mrate, 1 << shift); 176 } 177 178 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 179 if (ieee80211_is_data_qos(hdr->frame_control) && 180 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 181 dur = 0; 182 else 183 /* Time needed to transmit ACK 184 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 185 * to closest integer */ 186 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 187 tx->sdata->vif.bss_conf.use_short_preamble, 188 shift); 189 190 if (next_frag_len) { 191 /* Frame is fragmented: duration increases with time needed to 192 * transmit next fragment plus ACK and 2 x SIFS. */ 193 dur *= 2; /* ACK + SIFS */ 194 /* next fragment */ 195 dur += ieee80211_frame_duration(sband->band, next_frag_len, 196 txrate->bitrate, erp, 197 tx->sdata->vif.bss_conf.use_short_preamble, 198 shift); 199 } 200 201 return cpu_to_le16(dur); 202 } 203 204 /* tx handlers */ 205 static ieee80211_tx_result debug_noinline 206 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 207 { 208 struct ieee80211_local *local = tx->local; 209 struct ieee80211_if_managed *ifmgd; 210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 211 212 /* driver doesn't support power save */ 213 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 214 return TX_CONTINUE; 215 216 /* hardware does dynamic power save */ 217 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 218 return TX_CONTINUE; 219 220 /* dynamic power save disabled */ 221 if (local->hw.conf.dynamic_ps_timeout <= 0) 222 return TX_CONTINUE; 223 224 /* we are scanning, don't enable power save */ 225 if (local->scanning) 226 return TX_CONTINUE; 227 228 if (!local->ps_sdata) 229 return TX_CONTINUE; 230 231 /* No point if we're going to suspend */ 232 if (local->quiescing) 233 return TX_CONTINUE; 234 235 /* dynamic ps is supported only in managed mode */ 236 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 237 return TX_CONTINUE; 238 239 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 240 return TX_CONTINUE; 241 242 ifmgd = &tx->sdata->u.mgd; 243 244 /* 245 * Don't wakeup from power save if u-apsd is enabled, voip ac has 246 * u-apsd enabled and the frame is in voip class. This effectively 247 * means that even if all access categories have u-apsd enabled, in 248 * practise u-apsd is only used with the voip ac. This is a 249 * workaround for the case when received voip class packets do not 250 * have correct qos tag for some reason, due the network or the 251 * peer application. 252 * 253 * Note: ifmgd->uapsd_queues access is racy here. If the value is 254 * changed via debugfs, user needs to reassociate manually to have 255 * everything in sync. 256 */ 257 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 258 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 259 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 260 return TX_CONTINUE; 261 262 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 263 ieee80211_stop_queues_by_reason(&local->hw, 264 IEEE80211_MAX_QUEUE_MAP, 265 IEEE80211_QUEUE_STOP_REASON_PS, 266 false); 267 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 268 ieee80211_queue_work(&local->hw, 269 &local->dynamic_ps_disable_work); 270 } 271 272 /* Don't restart the timer if we're not disassociated */ 273 if (!ifmgd->associated) 274 return TX_CONTINUE; 275 276 mod_timer(&local->dynamic_ps_timer, jiffies + 277 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 278 279 return TX_CONTINUE; 280 } 281 282 static ieee80211_tx_result debug_noinline 283 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 284 { 285 286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 288 bool assoc = false; 289 290 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 291 return TX_CONTINUE; 292 293 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 294 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 295 !ieee80211_is_probe_req(hdr->frame_control) && 296 !ieee80211_is_any_nullfunc(hdr->frame_control)) 297 /* 298 * When software scanning only nullfunc frames (to notify 299 * the sleep state to the AP) and probe requests (for the 300 * active scan) are allowed, all other frames should not be 301 * sent and we should not get here, but if we do 302 * nonetheless, drop them to avoid sending them 303 * off-channel. See the link below and 304 * ieee80211_start_scan() for more. 305 * 306 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 307 */ 308 return TX_DROP; 309 310 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 311 return TX_CONTINUE; 312 313 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 314 return TX_CONTINUE; 315 316 if (tx->sta) 317 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 318 319 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 320 if (unlikely(!assoc && 321 ieee80211_is_data(hdr->frame_control))) { 322 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 323 sdata_info(tx->sdata, 324 "dropped data frame to not associated station %pM\n", 325 hdr->addr1); 326 #endif 327 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 328 return TX_DROP; 329 } 330 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 331 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 332 /* 333 * No associated STAs - no need to send multicast 334 * frames. 335 */ 336 return TX_DROP; 337 } 338 339 return TX_CONTINUE; 340 } 341 342 /* This function is called whenever the AP is about to exceed the maximum limit 343 * of buffered frames for power saving STAs. This situation should not really 344 * happen often during normal operation, so dropping the oldest buffered packet 345 * from each queue should be OK to make some room for new frames. */ 346 static void purge_old_ps_buffers(struct ieee80211_local *local) 347 { 348 int total = 0, purged = 0; 349 struct sk_buff *skb; 350 struct ieee80211_sub_if_data *sdata; 351 struct sta_info *sta; 352 353 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 354 struct ps_data *ps; 355 356 if (sdata->vif.type == NL80211_IFTYPE_AP) 357 ps = &sdata->u.ap.ps; 358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 359 ps = &sdata->u.mesh.ps; 360 else 361 continue; 362 363 skb = skb_dequeue(&ps->bc_buf); 364 if (skb) { 365 purged++; 366 ieee80211_free_txskb(&local->hw, skb); 367 } 368 total += skb_queue_len(&ps->bc_buf); 369 } 370 371 /* 372 * Drop one frame from each station from the lowest-priority 373 * AC that has frames at all. 374 */ 375 list_for_each_entry_rcu(sta, &local->sta_list, list) { 376 int ac; 377 378 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 379 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 380 total += skb_queue_len(&sta->ps_tx_buf[ac]); 381 if (skb) { 382 purged++; 383 ieee80211_free_txskb(&local->hw, skb); 384 break; 385 } 386 } 387 } 388 389 local->total_ps_buffered = total; 390 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 391 } 392 393 static ieee80211_tx_result 394 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 395 { 396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 398 struct ps_data *ps; 399 400 /* 401 * broadcast/multicast frame 402 * 403 * If any of the associated/peer stations is in power save mode, 404 * the frame is buffered to be sent after DTIM beacon frame. 405 * This is done either by the hardware or us. 406 */ 407 408 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 409 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 410 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 411 if (!tx->sdata->bss) 412 return TX_CONTINUE; 413 414 ps = &tx->sdata->bss->ps; 415 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 416 ps = &tx->sdata->u.mesh.ps; 417 } else { 418 return TX_CONTINUE; 419 } 420 421 422 /* no buffering for ordered frames */ 423 if (ieee80211_has_order(hdr->frame_control)) 424 return TX_CONTINUE; 425 426 if (ieee80211_is_probe_req(hdr->frame_control)) 427 return TX_CONTINUE; 428 429 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 430 info->hw_queue = tx->sdata->vif.cab_queue; 431 432 /* no stations in PS mode and no buffered packets */ 433 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 434 return TX_CONTINUE; 435 436 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 437 438 /* device releases frame after DTIM beacon */ 439 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 440 return TX_CONTINUE; 441 442 /* buffered in mac80211 */ 443 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 444 purge_old_ps_buffers(tx->local); 445 446 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 447 ps_dbg(tx->sdata, 448 "BC TX buffer full - dropping the oldest frame\n"); 449 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 450 } else 451 tx->local->total_ps_buffered++; 452 453 skb_queue_tail(&ps->bc_buf, tx->skb); 454 455 return TX_QUEUED; 456 } 457 458 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 459 struct sk_buff *skb) 460 { 461 if (!ieee80211_is_mgmt(fc)) 462 return 0; 463 464 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 465 return 0; 466 467 if (!ieee80211_is_robust_mgmt_frame(skb)) 468 return 0; 469 470 return 1; 471 } 472 473 static ieee80211_tx_result 474 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 475 { 476 struct sta_info *sta = tx->sta; 477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 479 struct ieee80211_local *local = tx->local; 480 481 if (unlikely(!sta)) 482 return TX_CONTINUE; 483 484 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 485 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 486 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 487 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 488 int ac = skb_get_queue_mapping(tx->skb); 489 490 if (ieee80211_is_mgmt(hdr->frame_control) && 491 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 492 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 493 return TX_CONTINUE; 494 } 495 496 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 497 sta->sta.addr, sta->sta.aid, ac); 498 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 499 purge_old_ps_buffers(tx->local); 500 501 /* sync with ieee80211_sta_ps_deliver_wakeup */ 502 spin_lock(&sta->ps_lock); 503 /* 504 * STA woke up the meantime and all the frames on ps_tx_buf have 505 * been queued to pending queue. No reordering can happen, go 506 * ahead and Tx the packet. 507 */ 508 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 509 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 510 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 511 spin_unlock(&sta->ps_lock); 512 return TX_CONTINUE; 513 } 514 515 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 516 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 517 ps_dbg(tx->sdata, 518 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 519 sta->sta.addr, ac); 520 ieee80211_free_txskb(&local->hw, old); 521 } else 522 tx->local->total_ps_buffered++; 523 524 info->control.jiffies = jiffies; 525 info->control.vif = &tx->sdata->vif; 526 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 527 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 528 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 529 spin_unlock(&sta->ps_lock); 530 531 if (!timer_pending(&local->sta_cleanup)) 532 mod_timer(&local->sta_cleanup, 533 round_jiffies(jiffies + 534 STA_INFO_CLEANUP_INTERVAL)); 535 536 /* 537 * We queued up some frames, so the TIM bit might 538 * need to be set, recalculate it. 539 */ 540 sta_info_recalc_tim(sta); 541 542 return TX_QUEUED; 543 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 544 ps_dbg(tx->sdata, 545 "STA %pM in PS mode, but polling/in SP -> send frame\n", 546 sta->sta.addr); 547 } 548 549 return TX_CONTINUE; 550 } 551 552 static ieee80211_tx_result debug_noinline 553 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 554 { 555 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 556 return TX_CONTINUE; 557 558 if (tx->flags & IEEE80211_TX_UNICAST) 559 return ieee80211_tx_h_unicast_ps_buf(tx); 560 else 561 return ieee80211_tx_h_multicast_ps_buf(tx); 562 } 563 564 static ieee80211_tx_result debug_noinline 565 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 566 { 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 569 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 570 if (tx->sdata->control_port_no_encrypt) 571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 572 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 573 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 574 } 575 576 return TX_CONTINUE; 577 } 578 579 static struct ieee80211_key * 580 ieee80211_select_link_key(struct ieee80211_tx_data *tx) 581 { 582 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 enum { 585 USE_NONE, 586 USE_MGMT_KEY, 587 USE_MCAST_KEY, 588 } which_key = USE_NONE; 589 struct ieee80211_link_data *link; 590 unsigned int link_id; 591 592 if (ieee80211_is_group_privacy_action(tx->skb)) 593 which_key = USE_MCAST_KEY; 594 else if (ieee80211_is_mgmt(hdr->frame_control) && 595 is_multicast_ether_addr(hdr->addr1) && 596 ieee80211_is_robust_mgmt_frame(tx->skb)) 597 which_key = USE_MGMT_KEY; 598 else if (is_multicast_ether_addr(hdr->addr1)) 599 which_key = USE_MCAST_KEY; 600 else 601 return NULL; 602 603 link_id = u32_get_bits(info->control.flags, IEEE80211_TX_CTRL_MLO_LINK); 604 if (link_id == IEEE80211_LINK_UNSPECIFIED) { 605 link = &tx->sdata->deflink; 606 } else { 607 link = rcu_dereference(tx->sdata->link[link_id]); 608 if (!link) 609 return NULL; 610 } 611 612 switch (which_key) { 613 case USE_NONE: 614 break; 615 case USE_MGMT_KEY: 616 return rcu_dereference(link->default_mgmt_key); 617 case USE_MCAST_KEY: 618 return rcu_dereference(link->default_multicast_key); 619 } 620 621 return NULL; 622 } 623 624 static ieee80211_tx_result debug_noinline 625 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 626 { 627 struct ieee80211_key *key; 628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 629 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 630 631 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 632 tx->key = NULL; 633 return TX_CONTINUE; 634 } 635 636 if (tx->sta && 637 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 638 tx->key = key; 639 else if ((key = ieee80211_select_link_key(tx))) 640 tx->key = key; 641 else if (!is_multicast_ether_addr(hdr->addr1) && 642 (key = rcu_dereference(tx->sdata->default_unicast_key))) 643 tx->key = key; 644 else 645 tx->key = NULL; 646 647 if (tx->key) { 648 bool skip_hw = false; 649 650 /* TODO: add threshold stuff again */ 651 652 switch (tx->key->conf.cipher) { 653 case WLAN_CIPHER_SUITE_WEP40: 654 case WLAN_CIPHER_SUITE_WEP104: 655 case WLAN_CIPHER_SUITE_TKIP: 656 if (!ieee80211_is_data_present(hdr->frame_control)) 657 tx->key = NULL; 658 break; 659 case WLAN_CIPHER_SUITE_CCMP: 660 case WLAN_CIPHER_SUITE_CCMP_256: 661 case WLAN_CIPHER_SUITE_GCMP: 662 case WLAN_CIPHER_SUITE_GCMP_256: 663 if (!ieee80211_is_data_present(hdr->frame_control) && 664 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 665 tx->skb) && 666 !ieee80211_is_group_privacy_action(tx->skb)) 667 tx->key = NULL; 668 else 669 skip_hw = (tx->key->conf.flags & 670 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 671 ieee80211_is_mgmt(hdr->frame_control); 672 break; 673 case WLAN_CIPHER_SUITE_AES_CMAC: 674 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 675 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 676 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 677 if (!ieee80211_is_mgmt(hdr->frame_control)) 678 tx->key = NULL; 679 break; 680 } 681 682 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 683 !ieee80211_is_deauth(hdr->frame_control))) 684 return TX_DROP; 685 686 if (!skip_hw && tx->key && 687 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 688 info->control.hw_key = &tx->key->conf; 689 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 690 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 691 return TX_DROP; 692 } 693 694 return TX_CONTINUE; 695 } 696 697 static ieee80211_tx_result debug_noinline 698 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 699 { 700 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 701 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 702 struct ieee80211_supported_band *sband; 703 u32 len; 704 struct ieee80211_tx_rate_control txrc; 705 struct ieee80211_sta_rates *ratetbl = NULL; 706 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 707 bool assoc = false; 708 709 memset(&txrc, 0, sizeof(txrc)); 710 711 sband = tx->local->hw.wiphy->bands[info->band]; 712 713 len = min_t(u32, tx->skb->len + FCS_LEN, 714 tx->local->hw.wiphy->frag_threshold); 715 716 /* set up the tx rate control struct we give the RC algo */ 717 txrc.hw = &tx->local->hw; 718 txrc.sband = sband; 719 txrc.bss_conf = &tx->sdata->vif.bss_conf; 720 txrc.skb = tx->skb; 721 txrc.reported_rate.idx = -1; 722 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 723 724 if (tx->sdata->rc_has_mcs_mask[info->band]) 725 txrc.rate_idx_mcs_mask = 726 tx->sdata->rc_rateidx_mcs_mask[info->band]; 727 728 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 729 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 730 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 731 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 732 733 /* set up RTS protection if desired */ 734 if (len > tx->local->hw.wiphy->rts_threshold) { 735 txrc.rts = true; 736 } 737 738 info->control.use_rts = txrc.rts; 739 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 740 741 /* 742 * Use short preamble if the BSS can handle it, but not for 743 * management frames unless we know the receiver can handle 744 * that -- the management frame might be to a station that 745 * just wants a probe response. 746 */ 747 if (tx->sdata->vif.bss_conf.use_short_preamble && 748 (ieee80211_is_tx_data(tx->skb) || 749 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 750 txrc.short_preamble = true; 751 752 info->control.short_preamble = txrc.short_preamble; 753 754 /* don't ask rate control when rate already injected via radiotap */ 755 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 756 return TX_CONTINUE; 757 758 if (tx->sta) 759 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 760 761 /* 762 * Lets not bother rate control if we're associated and cannot 763 * talk to the sta. This should not happen. 764 */ 765 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 766 !rate_usable_index_exists(sband, &tx->sta->sta), 767 "%s: Dropped data frame as no usable bitrate found while " 768 "scanning and associated. Target station: " 769 "%pM on %d GHz band\n", 770 tx->sdata->name, 771 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 772 info->band ? 5 : 2)) 773 return TX_DROP; 774 775 /* 776 * If we're associated with the sta at this point we know we can at 777 * least send the frame at the lowest bit rate. 778 */ 779 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 780 781 if (tx->sta && !info->control.skip_table) 782 ratetbl = rcu_dereference(tx->sta->sta.rates); 783 784 if (unlikely(info->control.rates[0].idx < 0)) { 785 if (ratetbl) { 786 struct ieee80211_tx_rate rate = { 787 .idx = ratetbl->rate[0].idx, 788 .flags = ratetbl->rate[0].flags, 789 .count = ratetbl->rate[0].count 790 }; 791 792 if (ratetbl->rate[0].idx < 0) 793 return TX_DROP; 794 795 tx->rate = rate; 796 } else { 797 return TX_DROP; 798 } 799 } else { 800 tx->rate = info->control.rates[0]; 801 } 802 803 if (txrc.reported_rate.idx < 0) { 804 txrc.reported_rate = tx->rate; 805 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 806 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 807 } else if (tx->sta) 808 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 809 810 if (ratetbl) 811 return TX_CONTINUE; 812 813 if (unlikely(!info->control.rates[0].count)) 814 info->control.rates[0].count = 1; 815 816 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 817 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 818 info->control.rates[0].count = 1; 819 820 return TX_CONTINUE; 821 } 822 823 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 824 { 825 u16 *seq = &sta->tid_seq[tid]; 826 __le16 ret = cpu_to_le16(*seq); 827 828 /* Increase the sequence number. */ 829 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 830 831 return ret; 832 } 833 834 static ieee80211_tx_result debug_noinline 835 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 836 { 837 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 838 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 839 int tid; 840 841 /* 842 * Packet injection may want to control the sequence 843 * number, if we have no matching interface then we 844 * neither assign one ourselves nor ask the driver to. 845 */ 846 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 847 return TX_CONTINUE; 848 849 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 850 return TX_CONTINUE; 851 852 if (ieee80211_hdrlen(hdr->frame_control) < 24) 853 return TX_CONTINUE; 854 855 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 856 return TX_CONTINUE; 857 858 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 859 return TX_CONTINUE; 860 861 /* SNS11 from 802.11be 10.3.2.14 */ 862 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 863 info->control.vif->valid_links && 864 info->control.vif->type == NL80211_IFTYPE_AP)) { 865 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 866 tx->sdata->mld_mcast_seq += 0x10; 867 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 868 return TX_CONTINUE; 869 } 870 871 /* 872 * Anything but QoS data that has a sequence number field 873 * (is long enough) gets a sequence number from the global 874 * counter. QoS data frames with a multicast destination 875 * also use the global counter (802.11-2012 9.3.2.10). 876 */ 877 if (!ieee80211_is_data_qos(hdr->frame_control) || 878 is_multicast_ether_addr(hdr->addr1)) { 879 /* driver should assign sequence number */ 880 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 881 /* for pure STA mode without beacons, we can do it */ 882 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 883 tx->sdata->sequence_number += 0x10; 884 if (tx->sta) 885 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 886 return TX_CONTINUE; 887 } 888 889 /* 890 * This should be true for injected/management frames only, for 891 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 892 * above since they are not QoS-data frames. 893 */ 894 if (!tx->sta) 895 return TX_CONTINUE; 896 897 /* include per-STA, per-TID sequence counter */ 898 tid = ieee80211_get_tid(hdr); 899 tx->sta->deflink.tx_stats.msdu[tid]++; 900 901 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 902 903 return TX_CONTINUE; 904 } 905 906 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 907 struct sk_buff *skb, int hdrlen, 908 int frag_threshold) 909 { 910 struct ieee80211_local *local = tx->local; 911 struct ieee80211_tx_info *info; 912 struct sk_buff *tmp; 913 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 914 int pos = hdrlen + per_fragm; 915 int rem = skb->len - hdrlen - per_fragm; 916 917 if (WARN_ON(rem < 0)) 918 return -EINVAL; 919 920 /* first fragment was already added to queue by caller */ 921 922 while (rem) { 923 int fraglen = per_fragm; 924 925 if (fraglen > rem) 926 fraglen = rem; 927 rem -= fraglen; 928 tmp = dev_alloc_skb(local->tx_headroom + 929 frag_threshold + 930 IEEE80211_ENCRYPT_HEADROOM + 931 IEEE80211_ENCRYPT_TAILROOM); 932 if (!tmp) 933 return -ENOMEM; 934 935 __skb_queue_tail(&tx->skbs, tmp); 936 937 skb_reserve(tmp, 938 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 939 940 /* copy control information */ 941 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 942 943 info = IEEE80211_SKB_CB(tmp); 944 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 945 IEEE80211_TX_CTL_FIRST_FRAGMENT); 946 947 if (rem) 948 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 949 950 skb_copy_queue_mapping(tmp, skb); 951 tmp->priority = skb->priority; 952 tmp->dev = skb->dev; 953 954 /* copy header and data */ 955 skb_put_data(tmp, skb->data, hdrlen); 956 skb_put_data(tmp, skb->data + pos, fraglen); 957 958 pos += fraglen; 959 } 960 961 /* adjust first fragment's length */ 962 skb_trim(skb, hdrlen + per_fragm); 963 return 0; 964 } 965 966 static ieee80211_tx_result debug_noinline 967 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 968 { 969 struct sk_buff *skb = tx->skb; 970 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 971 struct ieee80211_hdr *hdr = (void *)skb->data; 972 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 973 int hdrlen; 974 int fragnum; 975 976 /* no matter what happens, tx->skb moves to tx->skbs */ 977 __skb_queue_tail(&tx->skbs, skb); 978 tx->skb = NULL; 979 980 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 981 return TX_CONTINUE; 982 983 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 984 return TX_CONTINUE; 985 986 /* 987 * Warn when submitting a fragmented A-MPDU frame and drop it. 988 * This scenario is handled in ieee80211_tx_prepare but extra 989 * caution taken here as fragmented ampdu may cause Tx stop. 990 */ 991 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 992 return TX_DROP; 993 994 hdrlen = ieee80211_hdrlen(hdr->frame_control); 995 996 /* internal error, why isn't DONTFRAG set? */ 997 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 998 return TX_DROP; 999 1000 /* 1001 * Now fragment the frame. This will allocate all the fragments and 1002 * chain them (using skb as the first fragment) to skb->next. 1003 * During transmission, we will remove the successfully transmitted 1004 * fragments from this list. When the low-level driver rejects one 1005 * of the fragments then we will simply pretend to accept the skb 1006 * but store it away as pending. 1007 */ 1008 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 1009 return TX_DROP; 1010 1011 /* update duration/seq/flags of fragments */ 1012 fragnum = 0; 1013 1014 skb_queue_walk(&tx->skbs, skb) { 1015 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 1016 1017 hdr = (void *)skb->data; 1018 info = IEEE80211_SKB_CB(skb); 1019 1020 if (!skb_queue_is_last(&tx->skbs, skb)) { 1021 hdr->frame_control |= morefrags; 1022 /* 1023 * No multi-rate retries for fragmented frames, that 1024 * would completely throw off the NAV at other STAs. 1025 */ 1026 info->control.rates[1].idx = -1; 1027 info->control.rates[2].idx = -1; 1028 info->control.rates[3].idx = -1; 1029 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 1030 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 1031 } else { 1032 hdr->frame_control &= ~morefrags; 1033 } 1034 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 1035 fragnum++; 1036 } 1037 1038 return TX_CONTINUE; 1039 } 1040 1041 static ieee80211_tx_result debug_noinline 1042 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1043 { 1044 struct sk_buff *skb; 1045 int ac = -1; 1046 1047 if (!tx->sta) 1048 return TX_CONTINUE; 1049 1050 skb_queue_walk(&tx->skbs, skb) { 1051 ac = skb_get_queue_mapping(skb); 1052 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1053 } 1054 if (ac >= 0) 1055 tx->sta->deflink.tx_stats.packets[ac]++; 1056 1057 return TX_CONTINUE; 1058 } 1059 1060 static ieee80211_tx_result debug_noinline 1061 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1062 { 1063 if (!tx->key) 1064 return TX_CONTINUE; 1065 1066 switch (tx->key->conf.cipher) { 1067 case WLAN_CIPHER_SUITE_WEP40: 1068 case WLAN_CIPHER_SUITE_WEP104: 1069 return ieee80211_crypto_wep_encrypt(tx); 1070 case WLAN_CIPHER_SUITE_TKIP: 1071 return ieee80211_crypto_tkip_encrypt(tx); 1072 case WLAN_CIPHER_SUITE_CCMP: 1073 return ieee80211_crypto_ccmp_encrypt( 1074 tx, IEEE80211_CCMP_MIC_LEN); 1075 case WLAN_CIPHER_SUITE_CCMP_256: 1076 return ieee80211_crypto_ccmp_encrypt( 1077 tx, IEEE80211_CCMP_256_MIC_LEN); 1078 case WLAN_CIPHER_SUITE_AES_CMAC: 1079 return ieee80211_crypto_aes_cmac_encrypt(tx); 1080 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1081 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1082 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1083 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1084 return ieee80211_crypto_aes_gmac_encrypt(tx); 1085 case WLAN_CIPHER_SUITE_GCMP: 1086 case WLAN_CIPHER_SUITE_GCMP_256: 1087 return ieee80211_crypto_gcmp_encrypt(tx); 1088 } 1089 1090 return TX_DROP; 1091 } 1092 1093 static ieee80211_tx_result debug_noinline 1094 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1095 { 1096 struct sk_buff *skb; 1097 struct ieee80211_hdr *hdr; 1098 int next_len; 1099 bool group_addr; 1100 1101 skb_queue_walk(&tx->skbs, skb) { 1102 hdr = (void *) skb->data; 1103 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1104 break; /* must not overwrite AID */ 1105 if (!skb_queue_is_last(&tx->skbs, skb)) { 1106 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1107 next_len = next->len; 1108 } else 1109 next_len = 0; 1110 group_addr = is_multicast_ether_addr(hdr->addr1); 1111 1112 hdr->duration_id = 1113 ieee80211_duration(tx, skb, group_addr, next_len); 1114 } 1115 1116 return TX_CONTINUE; 1117 } 1118 1119 /* actual transmit path */ 1120 1121 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1122 struct sk_buff *skb, 1123 struct ieee80211_tx_info *info, 1124 struct tid_ampdu_tx *tid_tx, 1125 int tid) 1126 { 1127 bool queued = false; 1128 bool reset_agg_timer = false; 1129 struct sk_buff *purge_skb = NULL; 1130 1131 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1132 info->flags |= IEEE80211_TX_CTL_AMPDU; 1133 reset_agg_timer = true; 1134 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1135 /* 1136 * nothing -- this aggregation session is being started 1137 * but that might still fail with the driver 1138 */ 1139 } else if (!tx->sta->sta.txq[tid]) { 1140 spin_lock(&tx->sta->lock); 1141 /* 1142 * Need to re-check now, because we may get here 1143 * 1144 * 1) in the window during which the setup is actually 1145 * already done, but not marked yet because not all 1146 * packets are spliced over to the driver pending 1147 * queue yet -- if this happened we acquire the lock 1148 * either before or after the splice happens, but 1149 * need to recheck which of these cases happened. 1150 * 1151 * 2) during session teardown, if the OPERATIONAL bit 1152 * was cleared due to the teardown but the pointer 1153 * hasn't been assigned NULL yet (or we loaded it 1154 * before it was assigned) -- in this case it may 1155 * now be NULL which means we should just let the 1156 * packet pass through because splicing the frames 1157 * back is already done. 1158 */ 1159 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1160 1161 if (!tid_tx) { 1162 /* do nothing, let packet pass through */ 1163 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1164 info->flags |= IEEE80211_TX_CTL_AMPDU; 1165 reset_agg_timer = true; 1166 } else { 1167 queued = true; 1168 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1169 clear_sta_flag(tx->sta, WLAN_STA_SP); 1170 ps_dbg(tx->sta->sdata, 1171 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1172 tx->sta->sta.addr, tx->sta->sta.aid); 1173 } 1174 info->control.vif = &tx->sdata->vif; 1175 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1176 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1177 __skb_queue_tail(&tid_tx->pending, skb); 1178 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1179 purge_skb = __skb_dequeue(&tid_tx->pending); 1180 } 1181 spin_unlock(&tx->sta->lock); 1182 1183 if (purge_skb) 1184 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1185 } 1186 1187 /* reset session timer */ 1188 if (reset_agg_timer) 1189 tid_tx->last_tx = jiffies; 1190 1191 return queued; 1192 } 1193 1194 static void 1195 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1196 struct sta_info *sta, 1197 struct sk_buff *skb) 1198 { 1199 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1200 u16 tid; 1201 1202 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1203 return; 1204 1205 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1206 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1207 skb->protocol == sdata->control_port_protocol) 1208 return; 1209 1210 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1211 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1212 return; 1213 1214 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1215 } 1216 1217 /* 1218 * initialises @tx 1219 * pass %NULL for the station if unknown, a valid pointer if known 1220 * or an ERR_PTR() if the station is known not to exist 1221 */ 1222 static ieee80211_tx_result 1223 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1224 struct ieee80211_tx_data *tx, 1225 struct sta_info *sta, struct sk_buff *skb) 1226 { 1227 struct ieee80211_local *local = sdata->local; 1228 struct ieee80211_hdr *hdr; 1229 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1230 bool aggr_check = false; 1231 int tid; 1232 1233 memset(tx, 0, sizeof(*tx)); 1234 tx->skb = skb; 1235 tx->local = local; 1236 tx->sdata = sdata; 1237 __skb_queue_head_init(&tx->skbs); 1238 1239 /* 1240 * If this flag is set to true anywhere, and we get here, 1241 * we are doing the needed processing, so remove the flag 1242 * now. 1243 */ 1244 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1245 1246 hdr = (struct ieee80211_hdr *) skb->data; 1247 1248 if (likely(sta)) { 1249 if (!IS_ERR(sta)) 1250 tx->sta = sta; 1251 } else { 1252 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1253 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1254 if (!tx->sta && sdata->wdev.use_4addr) 1255 return TX_DROP; 1256 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1257 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1258 } 1259 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1260 tx->sta = sta_info_get(sdata, hdr->addr1); 1261 aggr_check = true; 1262 } 1263 } 1264 1265 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1266 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1267 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1268 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1269 struct tid_ampdu_tx *tid_tx; 1270 1271 tid = ieee80211_get_tid(hdr); 1272 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1273 if (!tid_tx && aggr_check) { 1274 ieee80211_aggr_check(sdata, tx->sta, skb); 1275 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1276 } 1277 1278 if (tid_tx) { 1279 bool queued; 1280 1281 queued = ieee80211_tx_prep_agg(tx, skb, info, 1282 tid_tx, tid); 1283 1284 if (unlikely(queued)) 1285 return TX_QUEUED; 1286 } 1287 } 1288 1289 if (is_multicast_ether_addr(hdr->addr1)) { 1290 tx->flags &= ~IEEE80211_TX_UNICAST; 1291 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1292 } else 1293 tx->flags |= IEEE80211_TX_UNICAST; 1294 1295 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1296 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1297 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1298 info->flags & IEEE80211_TX_CTL_AMPDU) 1299 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1300 } 1301 1302 if (!tx->sta) 1303 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1304 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1305 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1306 ieee80211_check_fast_xmit(tx->sta); 1307 } 1308 1309 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1310 1311 return TX_CONTINUE; 1312 } 1313 1314 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1315 struct ieee80211_vif *vif, 1316 struct sta_info *sta, 1317 struct sk_buff *skb) 1318 { 1319 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1320 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1321 struct ieee80211_txq *txq = NULL; 1322 1323 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1324 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1325 return NULL; 1326 1327 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1328 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1329 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1330 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1331 vif->type == NL80211_IFTYPE_STATION) && 1332 sta && sta->uploaded) { 1333 /* 1334 * This will be NULL if the driver didn't set the 1335 * opt-in hardware flag. 1336 */ 1337 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1338 } 1339 } else if (sta) { 1340 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1341 1342 if (!sta->uploaded) 1343 return NULL; 1344 1345 txq = sta->sta.txq[tid]; 1346 } else if (vif) { 1347 txq = vif->txq; 1348 } 1349 1350 if (!txq) 1351 return NULL; 1352 1353 return to_txq_info(txq); 1354 } 1355 1356 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1357 { 1358 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1359 } 1360 1361 static u32 codel_skb_len_func(const struct sk_buff *skb) 1362 { 1363 return skb->len; 1364 } 1365 1366 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1367 { 1368 const struct ieee80211_tx_info *info; 1369 1370 info = (const struct ieee80211_tx_info *)skb->cb; 1371 return info->control.enqueue_time; 1372 } 1373 1374 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1375 void *ctx) 1376 { 1377 struct ieee80211_local *local; 1378 struct txq_info *txqi; 1379 struct fq *fq; 1380 struct fq_flow *flow; 1381 1382 txqi = ctx; 1383 local = vif_to_sdata(txqi->txq.vif)->local; 1384 fq = &local->fq; 1385 1386 if (cvars == &txqi->def_cvars) 1387 flow = &txqi->tin.default_flow; 1388 else 1389 flow = &fq->flows[cvars - local->cvars]; 1390 1391 return fq_flow_dequeue(fq, flow); 1392 } 1393 1394 static void codel_drop_func(struct sk_buff *skb, 1395 void *ctx) 1396 { 1397 struct ieee80211_local *local; 1398 struct ieee80211_hw *hw; 1399 struct txq_info *txqi; 1400 1401 txqi = ctx; 1402 local = vif_to_sdata(txqi->txq.vif)->local; 1403 hw = &local->hw; 1404 1405 ieee80211_free_txskb(hw, skb); 1406 } 1407 1408 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1409 struct fq_tin *tin, 1410 struct fq_flow *flow) 1411 { 1412 struct ieee80211_local *local; 1413 struct txq_info *txqi; 1414 struct codel_vars *cvars; 1415 struct codel_params *cparams; 1416 struct codel_stats *cstats; 1417 1418 local = container_of(fq, struct ieee80211_local, fq); 1419 txqi = container_of(tin, struct txq_info, tin); 1420 cstats = &txqi->cstats; 1421 1422 if (txqi->txq.sta) { 1423 struct sta_info *sta = container_of(txqi->txq.sta, 1424 struct sta_info, sta); 1425 cparams = &sta->cparams; 1426 } else { 1427 cparams = &local->cparams; 1428 } 1429 1430 if (flow == &tin->default_flow) 1431 cvars = &txqi->def_cvars; 1432 else 1433 cvars = &local->cvars[flow - fq->flows]; 1434 1435 return codel_dequeue(txqi, 1436 &flow->backlog, 1437 cparams, 1438 cvars, 1439 cstats, 1440 codel_skb_len_func, 1441 codel_skb_time_func, 1442 codel_drop_func, 1443 codel_dequeue_func); 1444 } 1445 1446 static void fq_skb_free_func(struct fq *fq, 1447 struct fq_tin *tin, 1448 struct fq_flow *flow, 1449 struct sk_buff *skb) 1450 { 1451 struct ieee80211_local *local; 1452 1453 local = container_of(fq, struct ieee80211_local, fq); 1454 ieee80211_free_txskb(&local->hw, skb); 1455 } 1456 1457 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1458 struct txq_info *txqi, 1459 struct sk_buff *skb) 1460 { 1461 struct fq *fq = &local->fq; 1462 struct fq_tin *tin = &txqi->tin; 1463 u32 flow_idx = fq_flow_idx(fq, skb); 1464 1465 ieee80211_set_skb_enqueue_time(skb); 1466 1467 spin_lock_bh(&fq->lock); 1468 /* 1469 * For management frames, don't really apply codel etc., 1470 * we don't want to apply any shaping or anything we just 1471 * want to simplify the driver API by having them on the 1472 * txqi. 1473 */ 1474 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1475 IEEE80211_SKB_CB(skb)->control.flags |= 1476 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1477 __skb_queue_tail(&txqi->frags, skb); 1478 } else { 1479 fq_tin_enqueue(fq, tin, flow_idx, skb, 1480 fq_skb_free_func); 1481 } 1482 spin_unlock_bh(&fq->lock); 1483 } 1484 1485 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1486 struct fq_flow *flow, struct sk_buff *skb, 1487 void *data) 1488 { 1489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1490 1491 return info->control.vif == data; 1492 } 1493 1494 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1495 struct ieee80211_sub_if_data *sdata) 1496 { 1497 struct fq *fq = &local->fq; 1498 struct txq_info *txqi; 1499 struct fq_tin *tin; 1500 struct ieee80211_sub_if_data *ap; 1501 1502 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1503 return; 1504 1505 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1506 1507 if (!ap->vif.txq) 1508 return; 1509 1510 txqi = to_txq_info(ap->vif.txq); 1511 tin = &txqi->tin; 1512 1513 spin_lock_bh(&fq->lock); 1514 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1515 fq_skb_free_func); 1516 spin_unlock_bh(&fq->lock); 1517 } 1518 1519 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1520 struct sta_info *sta, 1521 struct txq_info *txqi, int tid) 1522 { 1523 fq_tin_init(&txqi->tin); 1524 codel_vars_init(&txqi->def_cvars); 1525 codel_stats_init(&txqi->cstats); 1526 __skb_queue_head_init(&txqi->frags); 1527 INIT_LIST_HEAD(&txqi->schedule_order); 1528 1529 txqi->txq.vif = &sdata->vif; 1530 1531 if (!sta) { 1532 sdata->vif.txq = &txqi->txq; 1533 txqi->txq.tid = 0; 1534 txqi->txq.ac = IEEE80211_AC_BE; 1535 1536 return; 1537 } 1538 1539 if (tid == IEEE80211_NUM_TIDS) { 1540 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1541 /* Drivers need to opt in to the management MPDU TXQ */ 1542 if (!ieee80211_hw_check(&sdata->local->hw, 1543 STA_MMPDU_TXQ)) 1544 return; 1545 } else if (!ieee80211_hw_check(&sdata->local->hw, 1546 BUFF_MMPDU_TXQ)) { 1547 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1548 return; 1549 } 1550 txqi->txq.ac = IEEE80211_AC_VO; 1551 } else { 1552 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1553 } 1554 1555 txqi->txq.sta = &sta->sta; 1556 txqi->txq.tid = tid; 1557 sta->sta.txq[tid] = &txqi->txq; 1558 } 1559 1560 void ieee80211_txq_purge(struct ieee80211_local *local, 1561 struct txq_info *txqi) 1562 { 1563 struct fq *fq = &local->fq; 1564 struct fq_tin *tin = &txqi->tin; 1565 1566 spin_lock_bh(&fq->lock); 1567 fq_tin_reset(fq, tin, fq_skb_free_func); 1568 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1569 spin_unlock_bh(&fq->lock); 1570 1571 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1572 list_del_init(&txqi->schedule_order); 1573 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1574 } 1575 1576 void ieee80211_txq_set_params(struct ieee80211_local *local) 1577 { 1578 if (local->hw.wiphy->txq_limit) 1579 local->fq.limit = local->hw.wiphy->txq_limit; 1580 else 1581 local->hw.wiphy->txq_limit = local->fq.limit; 1582 1583 if (local->hw.wiphy->txq_memory_limit) 1584 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1585 else 1586 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1587 1588 if (local->hw.wiphy->txq_quantum) 1589 local->fq.quantum = local->hw.wiphy->txq_quantum; 1590 else 1591 local->hw.wiphy->txq_quantum = local->fq.quantum; 1592 } 1593 1594 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1595 { 1596 struct fq *fq = &local->fq; 1597 int ret; 1598 int i; 1599 bool supp_vht = false; 1600 enum nl80211_band band; 1601 1602 if (!local->ops->wake_tx_queue) 1603 return 0; 1604 1605 ret = fq_init(fq, 4096); 1606 if (ret) 1607 return ret; 1608 1609 /* 1610 * If the hardware doesn't support VHT, it is safe to limit the maximum 1611 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1612 */ 1613 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1614 struct ieee80211_supported_band *sband; 1615 1616 sband = local->hw.wiphy->bands[band]; 1617 if (!sband) 1618 continue; 1619 1620 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1621 } 1622 1623 if (!supp_vht) 1624 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1625 1626 codel_params_init(&local->cparams); 1627 local->cparams.interval = MS2TIME(100); 1628 local->cparams.target = MS2TIME(20); 1629 local->cparams.ecn = true; 1630 1631 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1632 GFP_KERNEL); 1633 if (!local->cvars) { 1634 spin_lock_bh(&fq->lock); 1635 fq_reset(fq, fq_skb_free_func); 1636 spin_unlock_bh(&fq->lock); 1637 return -ENOMEM; 1638 } 1639 1640 for (i = 0; i < fq->flows_cnt; i++) 1641 codel_vars_init(&local->cvars[i]); 1642 1643 ieee80211_txq_set_params(local); 1644 1645 return 0; 1646 } 1647 1648 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1649 { 1650 struct fq *fq = &local->fq; 1651 1652 if (!local->ops->wake_tx_queue) 1653 return; 1654 1655 kfree(local->cvars); 1656 local->cvars = NULL; 1657 1658 spin_lock_bh(&fq->lock); 1659 fq_reset(fq, fq_skb_free_func); 1660 spin_unlock_bh(&fq->lock); 1661 } 1662 1663 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1664 struct ieee80211_sub_if_data *sdata, 1665 struct sta_info *sta, 1666 struct sk_buff *skb) 1667 { 1668 struct ieee80211_vif *vif; 1669 struct txq_info *txqi; 1670 1671 if (!local->ops->wake_tx_queue || 1672 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1673 return false; 1674 1675 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1676 sdata = container_of(sdata->bss, 1677 struct ieee80211_sub_if_data, u.ap); 1678 1679 vif = &sdata->vif; 1680 txqi = ieee80211_get_txq(local, vif, sta, skb); 1681 1682 if (!txqi) 1683 return false; 1684 1685 ieee80211_txq_enqueue(local, txqi, skb); 1686 1687 schedule_and_wake_txq(local, txqi); 1688 1689 return true; 1690 } 1691 1692 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1693 struct ieee80211_vif *vif, 1694 struct sta_info *sta, 1695 struct sk_buff_head *skbs, 1696 bool txpending) 1697 { 1698 struct ieee80211_tx_control control = {}; 1699 struct sk_buff *skb, *tmp; 1700 unsigned long flags; 1701 1702 skb_queue_walk_safe(skbs, skb, tmp) { 1703 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1704 int q = info->hw_queue; 1705 1706 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1707 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1708 __skb_unlink(skb, skbs); 1709 ieee80211_free_txskb(&local->hw, skb); 1710 continue; 1711 } 1712 #endif 1713 1714 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1715 if (local->queue_stop_reasons[q] || 1716 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1717 if (unlikely(info->flags & 1718 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1719 if (local->queue_stop_reasons[q] & 1720 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1721 /* 1722 * Drop off-channel frames if queues 1723 * are stopped for any reason other 1724 * than off-channel operation. Never 1725 * queue them. 1726 */ 1727 spin_unlock_irqrestore( 1728 &local->queue_stop_reason_lock, 1729 flags); 1730 ieee80211_purge_tx_queue(&local->hw, 1731 skbs); 1732 return true; 1733 } 1734 } else { 1735 1736 /* 1737 * Since queue is stopped, queue up frames for 1738 * later transmission from the tx-pending 1739 * tasklet when the queue is woken again. 1740 */ 1741 if (txpending) 1742 skb_queue_splice_init(skbs, 1743 &local->pending[q]); 1744 else 1745 skb_queue_splice_tail_init(skbs, 1746 &local->pending[q]); 1747 1748 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1749 flags); 1750 return false; 1751 } 1752 } 1753 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1754 1755 info->control.vif = vif; 1756 control.sta = sta ? &sta->sta : NULL; 1757 1758 __skb_unlink(skb, skbs); 1759 drv_tx(local, &control, skb); 1760 } 1761 1762 return true; 1763 } 1764 1765 /* 1766 * Returns false if the frame couldn't be transmitted but was queued instead. 1767 */ 1768 static bool __ieee80211_tx(struct ieee80211_local *local, 1769 struct sk_buff_head *skbs, struct sta_info *sta, 1770 bool txpending) 1771 { 1772 struct ieee80211_tx_info *info; 1773 struct ieee80211_sub_if_data *sdata; 1774 struct ieee80211_vif *vif; 1775 struct sk_buff *skb; 1776 bool result; 1777 1778 if (WARN_ON(skb_queue_empty(skbs))) 1779 return true; 1780 1781 skb = skb_peek(skbs); 1782 info = IEEE80211_SKB_CB(skb); 1783 sdata = vif_to_sdata(info->control.vif); 1784 if (sta && !sta->uploaded) 1785 sta = NULL; 1786 1787 switch (sdata->vif.type) { 1788 case NL80211_IFTYPE_MONITOR: 1789 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1790 vif = &sdata->vif; 1791 break; 1792 } 1793 sdata = rcu_dereference(local->monitor_sdata); 1794 if (sdata) { 1795 vif = &sdata->vif; 1796 info->hw_queue = 1797 vif->hw_queue[skb_get_queue_mapping(skb)]; 1798 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1799 ieee80211_purge_tx_queue(&local->hw, skbs); 1800 return true; 1801 } else 1802 vif = NULL; 1803 break; 1804 case NL80211_IFTYPE_AP_VLAN: 1805 sdata = container_of(sdata->bss, 1806 struct ieee80211_sub_if_data, u.ap); 1807 fallthrough; 1808 default: 1809 vif = &sdata->vif; 1810 break; 1811 } 1812 1813 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1814 1815 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1816 1817 return result; 1818 } 1819 1820 /* 1821 * Invoke TX handlers, return 0 on success and non-zero if the 1822 * frame was dropped or queued. 1823 * 1824 * The handlers are split into an early and late part. The latter is everything 1825 * that can be sensitive to reordering, and will be deferred to after packets 1826 * are dequeued from the intermediate queues (when they are enabled). 1827 */ 1828 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1829 { 1830 ieee80211_tx_result res = TX_DROP; 1831 1832 #define CALL_TXH(txh) \ 1833 do { \ 1834 res = txh(tx); \ 1835 if (res != TX_CONTINUE) \ 1836 goto txh_done; \ 1837 } while (0) 1838 1839 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1840 CALL_TXH(ieee80211_tx_h_check_assoc); 1841 CALL_TXH(ieee80211_tx_h_ps_buf); 1842 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1843 CALL_TXH(ieee80211_tx_h_select_key); 1844 1845 txh_done: 1846 if (unlikely(res == TX_DROP)) { 1847 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1848 if (tx->skb) 1849 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1850 else 1851 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1852 return -1; 1853 } else if (unlikely(res == TX_QUEUED)) { 1854 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1855 return -1; 1856 } 1857 1858 return 0; 1859 } 1860 1861 /* 1862 * Late handlers can be called while the sta lock is held. Handlers that can 1863 * cause packets to be generated will cause deadlock! 1864 */ 1865 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1866 { 1867 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1868 ieee80211_tx_result res = TX_CONTINUE; 1869 1870 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1871 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1872 1873 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1874 __skb_queue_tail(&tx->skbs, tx->skb); 1875 tx->skb = NULL; 1876 goto txh_done; 1877 } 1878 1879 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1880 CALL_TXH(ieee80211_tx_h_sequence); 1881 CALL_TXH(ieee80211_tx_h_fragment); 1882 /* handlers after fragment must be aware of tx info fragmentation! */ 1883 CALL_TXH(ieee80211_tx_h_stats); 1884 CALL_TXH(ieee80211_tx_h_encrypt); 1885 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1886 CALL_TXH(ieee80211_tx_h_calculate_duration); 1887 #undef CALL_TXH 1888 1889 txh_done: 1890 if (unlikely(res == TX_DROP)) { 1891 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1892 if (tx->skb) 1893 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1894 else 1895 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1896 return -1; 1897 } else if (unlikely(res == TX_QUEUED)) { 1898 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1899 return -1; 1900 } 1901 1902 return 0; 1903 } 1904 1905 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1906 { 1907 int r = invoke_tx_handlers_early(tx); 1908 1909 if (r) 1910 return r; 1911 return invoke_tx_handlers_late(tx); 1912 } 1913 1914 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1915 struct ieee80211_vif *vif, struct sk_buff *skb, 1916 int band, struct ieee80211_sta **sta) 1917 { 1918 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1919 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1920 struct ieee80211_tx_data tx; 1921 struct sk_buff *skb2; 1922 1923 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1924 return false; 1925 1926 info->band = band; 1927 info->control.vif = vif; 1928 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1929 1930 if (invoke_tx_handlers(&tx)) 1931 return false; 1932 1933 if (sta) { 1934 if (tx.sta) 1935 *sta = &tx.sta->sta; 1936 else 1937 *sta = NULL; 1938 } 1939 1940 /* this function isn't suitable for fragmented data frames */ 1941 skb2 = __skb_dequeue(&tx.skbs); 1942 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1943 ieee80211_free_txskb(hw, skb2); 1944 ieee80211_purge_tx_queue(hw, &tx.skbs); 1945 return false; 1946 } 1947 1948 return true; 1949 } 1950 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1951 1952 /* 1953 * Returns false if the frame couldn't be transmitted but was queued instead. 1954 */ 1955 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1956 struct sta_info *sta, struct sk_buff *skb, 1957 bool txpending) 1958 { 1959 struct ieee80211_local *local = sdata->local; 1960 struct ieee80211_tx_data tx; 1961 ieee80211_tx_result res_prepare; 1962 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1963 bool result = true; 1964 1965 if (unlikely(skb->len < 10)) { 1966 dev_kfree_skb(skb); 1967 return true; 1968 } 1969 1970 /* initialises tx */ 1971 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1972 1973 if (unlikely(res_prepare == TX_DROP)) { 1974 ieee80211_free_txskb(&local->hw, skb); 1975 return true; 1976 } else if (unlikely(res_prepare == TX_QUEUED)) { 1977 return true; 1978 } 1979 1980 /* set up hw_queue value early */ 1981 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1982 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1983 info->hw_queue = 1984 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1985 1986 if (invoke_tx_handlers_early(&tx)) 1987 return true; 1988 1989 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1990 return true; 1991 1992 if (!invoke_tx_handlers_late(&tx)) 1993 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1994 1995 return result; 1996 } 1997 1998 /* device xmit handlers */ 1999 2000 enum ieee80211_encrypt { 2001 ENCRYPT_NO, 2002 ENCRYPT_MGMT, 2003 ENCRYPT_DATA, 2004 }; 2005 2006 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 2007 struct sk_buff *skb, 2008 int head_need, 2009 enum ieee80211_encrypt encrypt) 2010 { 2011 struct ieee80211_local *local = sdata->local; 2012 bool enc_tailroom; 2013 int tail_need = 0; 2014 2015 enc_tailroom = encrypt == ENCRYPT_MGMT || 2016 (encrypt == ENCRYPT_DATA && 2017 sdata->crypto_tx_tailroom_needed_cnt); 2018 2019 if (enc_tailroom) { 2020 tail_need = IEEE80211_ENCRYPT_TAILROOM; 2021 tail_need -= skb_tailroom(skb); 2022 tail_need = max_t(int, tail_need, 0); 2023 } 2024 2025 if (skb_cloned(skb) && 2026 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 2027 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 2028 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 2029 else if (head_need || tail_need) 2030 I802_DEBUG_INC(local->tx_expand_skb_head); 2031 else 2032 return 0; 2033 2034 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 2035 wiphy_debug(local->hw.wiphy, 2036 "failed to reallocate TX buffer\n"); 2037 return -ENOMEM; 2038 } 2039 2040 return 0; 2041 } 2042 2043 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2044 struct sta_info *sta, struct sk_buff *skb) 2045 { 2046 struct ieee80211_local *local = sdata->local; 2047 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2048 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2049 int headroom; 2050 enum ieee80211_encrypt encrypt; 2051 2052 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2053 encrypt = ENCRYPT_NO; 2054 else if (ieee80211_is_mgmt(hdr->frame_control)) 2055 encrypt = ENCRYPT_MGMT; 2056 else 2057 encrypt = ENCRYPT_DATA; 2058 2059 headroom = local->tx_headroom; 2060 if (encrypt != ENCRYPT_NO) 2061 headroom += IEEE80211_ENCRYPT_HEADROOM; 2062 headroom -= skb_headroom(skb); 2063 headroom = max_t(int, 0, headroom); 2064 2065 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2066 ieee80211_free_txskb(&local->hw, skb); 2067 return; 2068 } 2069 2070 /* reload after potential resize */ 2071 hdr = (struct ieee80211_hdr *) skb->data; 2072 info->control.vif = &sdata->vif; 2073 2074 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2075 if (ieee80211_is_data(hdr->frame_control) && 2076 is_unicast_ether_addr(hdr->addr1)) { 2077 if (mesh_nexthop_resolve(sdata, skb)) 2078 return; /* skb queued: don't free */ 2079 } else { 2080 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2081 } 2082 } 2083 2084 ieee80211_set_qos_hdr(sdata, skb); 2085 ieee80211_tx(sdata, sta, skb, false); 2086 } 2087 2088 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2089 { 2090 struct ieee80211_radiotap_header *rthdr = 2091 (struct ieee80211_radiotap_header *)skb->data; 2092 2093 /* check for not even having the fixed radiotap header part */ 2094 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2095 return false; /* too short to be possibly valid */ 2096 2097 /* is it a header version we can trust to find length from? */ 2098 if (unlikely(rthdr->it_version)) 2099 return false; /* only version 0 is supported */ 2100 2101 /* does the skb contain enough to deliver on the alleged length? */ 2102 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2103 return false; /* skb too short for claimed rt header extent */ 2104 2105 return true; 2106 } 2107 2108 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2109 struct net_device *dev) 2110 { 2111 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2112 struct ieee80211_radiotap_iterator iterator; 2113 struct ieee80211_radiotap_header *rthdr = 2114 (struct ieee80211_radiotap_header *) skb->data; 2115 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2116 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2117 NULL); 2118 u16 txflags; 2119 u16 rate = 0; 2120 bool rate_found = false; 2121 u8 rate_retries = 0; 2122 u16 rate_flags = 0; 2123 u8 mcs_known, mcs_flags, mcs_bw; 2124 u16 vht_known; 2125 u8 vht_mcs = 0, vht_nss = 0; 2126 int i; 2127 2128 if (!ieee80211_validate_radiotap_len(skb)) 2129 return false; 2130 2131 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2132 IEEE80211_TX_CTL_DONTFRAG; 2133 2134 /* 2135 * for every radiotap entry that is present 2136 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2137 * entries present, or -EINVAL on error) 2138 */ 2139 2140 while (!ret) { 2141 ret = ieee80211_radiotap_iterator_next(&iterator); 2142 2143 if (ret) 2144 continue; 2145 2146 /* see if this argument is something we can use */ 2147 switch (iterator.this_arg_index) { 2148 /* 2149 * You must take care when dereferencing iterator.this_arg 2150 * for multibyte types... the pointer is not aligned. Use 2151 * get_unaligned((type *)iterator.this_arg) to dereference 2152 * iterator.this_arg for type "type" safely on all arches. 2153 */ 2154 case IEEE80211_RADIOTAP_FLAGS: 2155 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2156 /* 2157 * this indicates that the skb we have been 2158 * handed has the 32-bit FCS CRC at the end... 2159 * we should react to that by snipping it off 2160 * because it will be recomputed and added 2161 * on transmission 2162 */ 2163 if (skb->len < (iterator._max_length + FCS_LEN)) 2164 return false; 2165 2166 skb_trim(skb, skb->len - FCS_LEN); 2167 } 2168 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2169 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2170 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2171 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2172 break; 2173 2174 case IEEE80211_RADIOTAP_TX_FLAGS: 2175 txflags = get_unaligned_le16(iterator.this_arg); 2176 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2177 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2178 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2179 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2180 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2181 info->control.flags |= 2182 IEEE80211_TX_CTRL_DONT_REORDER; 2183 break; 2184 2185 case IEEE80211_RADIOTAP_RATE: 2186 rate = *iterator.this_arg; 2187 rate_flags = 0; 2188 rate_found = true; 2189 break; 2190 2191 case IEEE80211_RADIOTAP_DATA_RETRIES: 2192 rate_retries = *iterator.this_arg; 2193 break; 2194 2195 case IEEE80211_RADIOTAP_MCS: 2196 mcs_known = iterator.this_arg[0]; 2197 mcs_flags = iterator.this_arg[1]; 2198 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2199 break; 2200 2201 rate_found = true; 2202 rate = iterator.this_arg[2]; 2203 rate_flags = IEEE80211_TX_RC_MCS; 2204 2205 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2206 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2207 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2208 2209 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2210 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2211 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2212 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2213 2214 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2215 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2216 info->flags |= IEEE80211_TX_CTL_LDPC; 2217 2218 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2219 u8 stbc = u8_get_bits(mcs_flags, 2220 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2221 2222 info->flags |= 2223 u32_encode_bits(stbc, 2224 IEEE80211_TX_CTL_STBC); 2225 } 2226 break; 2227 2228 case IEEE80211_RADIOTAP_VHT: 2229 vht_known = get_unaligned_le16(iterator.this_arg); 2230 rate_found = true; 2231 2232 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2233 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2234 (iterator.this_arg[2] & 2235 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2236 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2237 if (vht_known & 2238 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2239 if (iterator.this_arg[3] == 1) 2240 rate_flags |= 2241 IEEE80211_TX_RC_40_MHZ_WIDTH; 2242 else if (iterator.this_arg[3] == 4) 2243 rate_flags |= 2244 IEEE80211_TX_RC_80_MHZ_WIDTH; 2245 else if (iterator.this_arg[3] == 11) 2246 rate_flags |= 2247 IEEE80211_TX_RC_160_MHZ_WIDTH; 2248 } 2249 2250 vht_mcs = iterator.this_arg[4] >> 4; 2251 if (vht_mcs > 11) 2252 vht_mcs = 0; 2253 vht_nss = iterator.this_arg[4] & 0xF; 2254 if (!vht_nss || vht_nss > 8) 2255 vht_nss = 1; 2256 break; 2257 2258 /* 2259 * Please update the file 2260 * Documentation/networking/mac80211-injection.rst 2261 * when parsing new fields here. 2262 */ 2263 2264 default: 2265 break; 2266 } 2267 } 2268 2269 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2270 return false; 2271 2272 if (rate_found) { 2273 struct ieee80211_supported_band *sband = 2274 local->hw.wiphy->bands[info->band]; 2275 2276 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2277 2278 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2279 info->control.rates[i].idx = -1; 2280 info->control.rates[i].flags = 0; 2281 info->control.rates[i].count = 0; 2282 } 2283 2284 if (rate_flags & IEEE80211_TX_RC_MCS) { 2285 info->control.rates[0].idx = rate; 2286 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2287 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2288 vht_nss); 2289 } else if (sband) { 2290 for (i = 0; i < sband->n_bitrates; i++) { 2291 if (rate * 5 != sband->bitrates[i].bitrate) 2292 continue; 2293 2294 info->control.rates[0].idx = i; 2295 break; 2296 } 2297 } 2298 2299 if (info->control.rates[0].idx < 0) 2300 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2301 2302 info->control.rates[0].flags = rate_flags; 2303 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2304 local->hw.max_rate_tries); 2305 } 2306 2307 return true; 2308 } 2309 2310 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2311 struct net_device *dev) 2312 { 2313 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2314 struct ieee80211_chanctx_conf *chanctx_conf; 2315 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2316 struct ieee80211_hdr *hdr; 2317 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2318 struct cfg80211_chan_def *chandef; 2319 u16 len_rthdr; 2320 int hdrlen; 2321 2322 memset(info, 0, sizeof(*info)); 2323 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2324 IEEE80211_TX_CTL_INJECTED; 2325 2326 /* Sanity-check the length of the radiotap header */ 2327 if (!ieee80211_validate_radiotap_len(skb)) 2328 goto fail; 2329 2330 /* we now know there is a radiotap header with a length we can use */ 2331 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2332 2333 /* 2334 * fix up the pointers accounting for the radiotap 2335 * header still being in there. We are being given 2336 * a precooked IEEE80211 header so no need for 2337 * normal processing 2338 */ 2339 skb_set_mac_header(skb, len_rthdr); 2340 /* 2341 * these are just fixed to the end of the rt area since we 2342 * don't have any better information and at this point, nobody cares 2343 */ 2344 skb_set_network_header(skb, len_rthdr); 2345 skb_set_transport_header(skb, len_rthdr); 2346 2347 if (skb->len < len_rthdr + 2) 2348 goto fail; 2349 2350 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2351 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2352 2353 if (skb->len < len_rthdr + hdrlen) 2354 goto fail; 2355 2356 /* 2357 * Initialize skb->protocol if the injected frame is a data frame 2358 * carrying a rfc1042 header 2359 */ 2360 if (ieee80211_is_data(hdr->frame_control) && 2361 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2362 u8 *payload = (u8 *)hdr + hdrlen; 2363 2364 if (ether_addr_equal(payload, rfc1042_header)) 2365 skb->protocol = cpu_to_be16((payload[6] << 8) | 2366 payload[7]); 2367 } 2368 2369 rcu_read_lock(); 2370 2371 /* 2372 * We process outgoing injected frames that have a local address 2373 * we handle as though they are non-injected frames. 2374 * This code here isn't entirely correct, the local MAC address 2375 * isn't always enough to find the interface to use; for proper 2376 * VLAN support we have an nl80211-based mechanism. 2377 * 2378 * This is necessary, for example, for old hostapd versions that 2379 * don't use nl80211-based management TX/RX. 2380 */ 2381 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2382 2383 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2384 if (!ieee80211_sdata_running(tmp_sdata)) 2385 continue; 2386 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2387 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2388 continue; 2389 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2390 sdata = tmp_sdata; 2391 break; 2392 } 2393 } 2394 2395 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2396 if (!chanctx_conf) { 2397 tmp_sdata = rcu_dereference(local->monitor_sdata); 2398 if (tmp_sdata) 2399 chanctx_conf = 2400 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2401 } 2402 2403 if (chanctx_conf) 2404 chandef = &chanctx_conf->def; 2405 else if (!local->use_chanctx) 2406 chandef = &local->_oper_chandef; 2407 else 2408 goto fail_rcu; 2409 2410 /* 2411 * Frame injection is not allowed if beaconing is not allowed 2412 * or if we need radar detection. Beaconing is usually not allowed when 2413 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2414 * Passive scan is also used in world regulatory domains where 2415 * your country is not known and as such it should be treated as 2416 * NO TX unless the channel is explicitly allowed in which case 2417 * your current regulatory domain would not have the passive scan 2418 * flag. 2419 * 2420 * Since AP mode uses monitor interfaces to inject/TX management 2421 * frames we can make AP mode the exception to this rule once it 2422 * supports radar detection as its implementation can deal with 2423 * radar detection by itself. We can do that later by adding a 2424 * monitor flag interfaces used for AP support. 2425 */ 2426 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2427 sdata->vif.type)) 2428 goto fail_rcu; 2429 2430 info->band = chandef->chan->band; 2431 2432 /* Initialize skb->priority according to frame type and TID class, 2433 * with respect to the sub interface that the frame will actually 2434 * be transmitted on. If the DONT_REORDER flag is set, the original 2435 * skb-priority is preserved to assure frames injected with this 2436 * flag are not reordered relative to each other. 2437 */ 2438 ieee80211_select_queue_80211(sdata, skb, hdr); 2439 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2440 2441 /* 2442 * Process the radiotap header. This will now take into account the 2443 * selected chandef above to accurately set injection rates and 2444 * retransmissions. 2445 */ 2446 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2447 goto fail_rcu; 2448 2449 /* remove the injection radiotap header */ 2450 skb_pull(skb, len_rthdr); 2451 2452 ieee80211_xmit(sdata, NULL, skb); 2453 rcu_read_unlock(); 2454 2455 return NETDEV_TX_OK; 2456 2457 fail_rcu: 2458 rcu_read_unlock(); 2459 fail: 2460 dev_kfree_skb(skb); 2461 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2462 } 2463 2464 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2465 { 2466 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2467 2468 return ethertype == ETH_P_TDLS && 2469 skb->len > 14 && 2470 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2471 } 2472 2473 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2474 struct sk_buff *skb, 2475 struct sta_info **sta_out) 2476 { 2477 struct sta_info *sta; 2478 2479 switch (sdata->vif.type) { 2480 case NL80211_IFTYPE_AP_VLAN: 2481 sta = rcu_dereference(sdata->u.vlan.sta); 2482 if (sta) { 2483 *sta_out = sta; 2484 return 0; 2485 } else if (sdata->wdev.use_4addr) { 2486 return -ENOLINK; 2487 } 2488 fallthrough; 2489 case NL80211_IFTYPE_AP: 2490 case NL80211_IFTYPE_OCB: 2491 case NL80211_IFTYPE_ADHOC: 2492 if (is_multicast_ether_addr(skb->data)) { 2493 *sta_out = ERR_PTR(-ENOENT); 2494 return 0; 2495 } 2496 sta = sta_info_get_bss(sdata, skb->data); 2497 break; 2498 #ifdef CONFIG_MAC80211_MESH 2499 case NL80211_IFTYPE_MESH_POINT: 2500 /* determined much later */ 2501 *sta_out = NULL; 2502 return 0; 2503 #endif 2504 case NL80211_IFTYPE_STATION: 2505 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2506 sta = sta_info_get(sdata, skb->data); 2507 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2508 if (test_sta_flag(sta, 2509 WLAN_STA_TDLS_PEER_AUTH)) { 2510 *sta_out = sta; 2511 return 0; 2512 } 2513 2514 /* 2515 * TDLS link during setup - throw out frames to 2516 * peer. Allow TDLS-setup frames to unauthorized 2517 * peers for the special case of a link teardown 2518 * after a TDLS sta is removed due to being 2519 * unreachable. 2520 */ 2521 if (!ieee80211_is_tdls_setup(skb)) 2522 return -EINVAL; 2523 } 2524 2525 } 2526 2527 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2528 if (!sta) 2529 return -ENOLINK; 2530 break; 2531 default: 2532 return -EINVAL; 2533 } 2534 2535 *sta_out = sta ?: ERR_PTR(-ENOENT); 2536 return 0; 2537 } 2538 2539 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2540 struct sk_buff *skb, 2541 u32 *info_flags, 2542 u64 *cookie) 2543 { 2544 struct sk_buff *ack_skb; 2545 u16 info_id = 0; 2546 2547 if (skb->sk) 2548 ack_skb = skb_clone_sk(skb); 2549 else 2550 ack_skb = skb_clone(skb, GFP_ATOMIC); 2551 2552 if (ack_skb) { 2553 unsigned long flags; 2554 int id; 2555 2556 spin_lock_irqsave(&local->ack_status_lock, flags); 2557 id = idr_alloc(&local->ack_status_frames, ack_skb, 2558 1, 0x2000, GFP_ATOMIC); 2559 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2560 2561 if (id >= 0) { 2562 info_id = id; 2563 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2564 if (cookie) { 2565 *cookie = ieee80211_mgmt_tx_cookie(local); 2566 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2567 } 2568 } else { 2569 kfree_skb(ack_skb); 2570 } 2571 } 2572 2573 return info_id; 2574 } 2575 2576 /** 2577 * ieee80211_build_hdr - build 802.11 header in the given frame 2578 * @sdata: virtual interface to build the header for 2579 * @skb: the skb to build the header in 2580 * @info_flags: skb flags to set 2581 * @sta: the station pointer 2582 * @ctrl_flags: info control flags to set 2583 * @cookie: cookie pointer to fill (if not %NULL) 2584 * 2585 * This function takes the skb with 802.3 header and reformats the header to 2586 * the appropriate IEEE 802.11 header based on which interface the packet is 2587 * being transmitted on. 2588 * 2589 * Note that this function also takes care of the TX status request and 2590 * potential unsharing of the SKB - this needs to be interleaved with the 2591 * header building. 2592 * 2593 * The function requires the read-side RCU lock held 2594 * 2595 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2596 */ 2597 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2598 struct sk_buff *skb, u32 info_flags, 2599 struct sta_info *sta, u32 ctrl_flags, 2600 u64 *cookie) 2601 { 2602 struct ieee80211_local *local = sdata->local; 2603 struct ieee80211_tx_info *info; 2604 int head_need; 2605 u16 ethertype, hdrlen, meshhdrlen = 0; 2606 __le16 fc; 2607 struct ieee80211_hdr hdr; 2608 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2609 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2610 const u8 *encaps_data; 2611 int encaps_len, skip_header_bytes; 2612 bool wme_sta = false, authorized = false; 2613 bool tdls_peer; 2614 bool multicast; 2615 u16 info_id = 0; 2616 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2617 enum nl80211_band band; 2618 int ret; 2619 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2620 2621 if (IS_ERR(sta)) 2622 sta = NULL; 2623 2624 #ifdef CONFIG_MAC80211_DEBUGFS 2625 if (local->force_tx_status) 2626 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2627 #endif 2628 2629 /* convert Ethernet header to proper 802.11 header (based on 2630 * operation mode) */ 2631 ethertype = (skb->data[12] << 8) | skb->data[13]; 2632 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2633 2634 if (!sdata->vif.valid_links) 2635 chanctx_conf = 2636 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2637 2638 switch (sdata->vif.type) { 2639 case NL80211_IFTYPE_AP_VLAN: 2640 if (sdata->wdev.use_4addr) { 2641 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2642 /* RA TA DA SA */ 2643 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2644 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2645 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2646 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2647 hdrlen = 30; 2648 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2649 wme_sta = sta->sta.wme; 2650 } 2651 if (!sdata->vif.valid_links) { 2652 struct ieee80211_sub_if_data *ap_sdata; 2653 2654 /* override chanctx_conf from AP (we don't have one) */ 2655 ap_sdata = container_of(sdata->bss, 2656 struct ieee80211_sub_if_data, 2657 u.ap); 2658 chanctx_conf = 2659 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2660 } 2661 if (sdata->wdev.use_4addr) 2662 break; 2663 fallthrough; 2664 case NL80211_IFTYPE_AP: 2665 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2666 /* DA BSSID SA */ 2667 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2668 2669 if (sdata->vif.valid_links && sta && !sta->sta.mlo) { 2670 struct ieee80211_link_data *link; 2671 2672 link_id = sta->deflink.link_id; 2673 link = rcu_dereference(sdata->link[link_id]); 2674 if (WARN_ON(!link)) { 2675 ret = -ENOLINK; 2676 goto free; 2677 } 2678 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2679 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2680 (sta && sta->sta.mlo)) { 2681 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2682 } else { 2683 struct ieee80211_bss_conf *conf; 2684 2685 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2686 if (unlikely(!conf)) { 2687 ret = -ENOLINK; 2688 goto free; 2689 } 2690 2691 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2692 } 2693 2694 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2695 hdrlen = 24; 2696 break; 2697 #ifdef CONFIG_MAC80211_MESH 2698 case NL80211_IFTYPE_MESH_POINT: 2699 if (!is_multicast_ether_addr(skb->data)) { 2700 struct sta_info *next_hop; 2701 bool mpp_lookup = true; 2702 2703 mpath = mesh_path_lookup(sdata, skb->data); 2704 if (mpath) { 2705 mpp_lookup = false; 2706 next_hop = rcu_dereference(mpath->next_hop); 2707 if (!next_hop || 2708 !(mpath->flags & (MESH_PATH_ACTIVE | 2709 MESH_PATH_RESOLVING))) 2710 mpp_lookup = true; 2711 } 2712 2713 if (mpp_lookup) { 2714 mppath = mpp_path_lookup(sdata, skb->data); 2715 if (mppath) 2716 mppath->exp_time = jiffies; 2717 } 2718 2719 if (mppath && mpath) 2720 mesh_path_del(sdata, mpath->dst); 2721 } 2722 2723 /* 2724 * Use address extension if it is a packet from 2725 * another interface or if we know the destination 2726 * is being proxied by a portal (i.e. portal address 2727 * differs from proxied address) 2728 */ 2729 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2730 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2731 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2732 skb->data, skb->data + ETH_ALEN); 2733 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2734 NULL, NULL); 2735 } else { 2736 /* DS -> MBSS (802.11-2012 13.11.3.3). 2737 * For unicast with unknown forwarding information, 2738 * destination might be in the MBSS or if that fails 2739 * forwarded to another mesh gate. In either case 2740 * resolution will be handled in ieee80211_xmit(), so 2741 * leave the original DA. This also works for mcast */ 2742 const u8 *mesh_da = skb->data; 2743 2744 if (mppath) 2745 mesh_da = mppath->mpp; 2746 else if (mpath) 2747 mesh_da = mpath->dst; 2748 2749 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2750 mesh_da, sdata->vif.addr); 2751 if (is_multicast_ether_addr(mesh_da)) 2752 /* DA TA mSA AE:SA */ 2753 meshhdrlen = ieee80211_new_mesh_header( 2754 sdata, &mesh_hdr, 2755 skb->data + ETH_ALEN, NULL); 2756 else 2757 /* RA TA mDA mSA AE:DA SA */ 2758 meshhdrlen = ieee80211_new_mesh_header( 2759 sdata, &mesh_hdr, skb->data, 2760 skb->data + ETH_ALEN); 2761 2762 } 2763 2764 /* For injected frames, fill RA right away as nexthop lookup 2765 * will be skipped. 2766 */ 2767 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2768 is_zero_ether_addr(hdr.addr1)) 2769 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2770 break; 2771 #endif 2772 case NL80211_IFTYPE_STATION: 2773 /* we already did checks when looking up the RA STA */ 2774 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2775 2776 if (tdls_peer) { 2777 /* DA SA BSSID */ 2778 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2779 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2780 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2781 hdrlen = 24; 2782 } else if (sdata->u.mgd.use_4addr && 2783 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2784 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2785 IEEE80211_FCTL_TODS); 2786 /* RA TA DA SA */ 2787 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2788 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2789 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2790 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2791 hdrlen = 30; 2792 } else { 2793 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2794 /* BSSID SA DA */ 2795 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2796 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2797 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2798 hdrlen = 24; 2799 } 2800 break; 2801 case NL80211_IFTYPE_OCB: 2802 /* DA SA BSSID */ 2803 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2804 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2805 eth_broadcast_addr(hdr.addr3); 2806 hdrlen = 24; 2807 break; 2808 case NL80211_IFTYPE_ADHOC: 2809 /* DA SA BSSID */ 2810 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2811 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2812 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2813 hdrlen = 24; 2814 break; 2815 default: 2816 ret = -EINVAL; 2817 goto free; 2818 } 2819 2820 if (!chanctx_conf) { 2821 if (!sdata->vif.valid_links) { 2822 ret = -ENOTCONN; 2823 goto free; 2824 } 2825 /* MLD transmissions must not rely on the band */ 2826 band = 0; 2827 } else { 2828 band = chanctx_conf->def.chan->band; 2829 } 2830 2831 multicast = is_multicast_ether_addr(hdr.addr1); 2832 2833 /* sta is always NULL for mesh */ 2834 if (sta) { 2835 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2836 wme_sta = sta->sta.wme; 2837 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2838 /* For mesh, the use of the QoS header is mandatory */ 2839 wme_sta = true; 2840 } 2841 2842 /* receiver does QoS (which also means we do) use it */ 2843 if (wme_sta) { 2844 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2845 hdrlen += 2; 2846 } 2847 2848 /* 2849 * Drop unicast frames to unauthorised stations unless they are 2850 * EAPOL frames from the local station. 2851 */ 2852 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2853 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2854 !multicast && !authorized && 2855 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2856 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2857 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2858 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2859 sdata->name, hdr.addr1); 2860 #endif 2861 2862 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2863 2864 ret = -EPERM; 2865 goto free; 2866 } 2867 2868 if (unlikely(!multicast && ((skb->sk && 2869 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2870 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2871 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2872 cookie); 2873 2874 /* 2875 * If the skb is shared we need to obtain our own copy. 2876 */ 2877 skb = skb_share_check(skb, GFP_ATOMIC); 2878 if (unlikely(!skb)) { 2879 ret = -ENOMEM; 2880 goto free; 2881 } 2882 2883 hdr.frame_control = fc; 2884 hdr.duration_id = 0; 2885 hdr.seq_ctrl = 0; 2886 2887 skip_header_bytes = ETH_HLEN; 2888 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2889 encaps_data = bridge_tunnel_header; 2890 encaps_len = sizeof(bridge_tunnel_header); 2891 skip_header_bytes -= 2; 2892 } else if (ethertype >= ETH_P_802_3_MIN) { 2893 encaps_data = rfc1042_header; 2894 encaps_len = sizeof(rfc1042_header); 2895 skip_header_bytes -= 2; 2896 } else { 2897 encaps_data = NULL; 2898 encaps_len = 0; 2899 } 2900 2901 skb_pull(skb, skip_header_bytes); 2902 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2903 2904 /* 2905 * So we need to modify the skb header and hence need a copy of 2906 * that. The head_need variable above doesn't, so far, include 2907 * the needed header space that we don't need right away. If we 2908 * can, then we don't reallocate right now but only after the 2909 * frame arrives at the master device (if it does...) 2910 * 2911 * If we cannot, however, then we will reallocate to include all 2912 * the ever needed space. Also, if we need to reallocate it anyway, 2913 * make it big enough for everything we may ever need. 2914 */ 2915 2916 if (head_need > 0 || skb_cloned(skb)) { 2917 head_need += IEEE80211_ENCRYPT_HEADROOM; 2918 head_need += local->tx_headroom; 2919 head_need = max_t(int, 0, head_need); 2920 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2921 ieee80211_free_txskb(&local->hw, skb); 2922 skb = NULL; 2923 return ERR_PTR(-ENOMEM); 2924 } 2925 } 2926 2927 if (encaps_data) 2928 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2929 2930 #ifdef CONFIG_MAC80211_MESH 2931 if (meshhdrlen > 0) 2932 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2933 #endif 2934 2935 if (ieee80211_is_data_qos(fc)) { 2936 __le16 *qos_control; 2937 2938 qos_control = skb_push(skb, 2); 2939 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2940 /* 2941 * Maybe we could actually set some fields here, for now just 2942 * initialise to zero to indicate no special operation. 2943 */ 2944 *qos_control = 0; 2945 } else 2946 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2947 2948 skb_reset_mac_header(skb); 2949 2950 info = IEEE80211_SKB_CB(skb); 2951 memset(info, 0, sizeof(*info)); 2952 2953 info->flags = info_flags; 2954 info->ack_frame_id = info_id; 2955 info->band = band; 2956 2957 if (likely(!cookie)) { 2958 ctrl_flags |= u32_encode_bits(link_id, 2959 IEEE80211_TX_CTRL_MLO_LINK); 2960 } else { 2961 unsigned int pre_conf_link_id; 2962 2963 /* 2964 * ctrl_flags already have been set by 2965 * ieee80211_tx_control_port(), here 2966 * we just sanity check that 2967 */ 2968 2969 pre_conf_link_id = u32_get_bits(ctrl_flags, 2970 IEEE80211_TX_CTRL_MLO_LINK); 2971 2972 if (pre_conf_link_id != link_id && 2973 link_id != IEEE80211_LINK_UNSPECIFIED) { 2974 #ifdef CPTCFG_MAC80211_VERBOSE_DEBUG 2975 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2976 sdata->name, hdr.addr1, 2977 pre_conf_link_id, link_id); 2978 #endif 2979 ret = -EINVAL; 2980 goto free; 2981 } 2982 } 2983 2984 info->control.flags = ctrl_flags; 2985 2986 return skb; 2987 free: 2988 kfree_skb(skb); 2989 return ERR_PTR(ret); 2990 } 2991 2992 /* 2993 * fast-xmit overview 2994 * 2995 * The core idea of this fast-xmit is to remove per-packet checks by checking 2996 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2997 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2998 * much less work can be done per packet. For example, fragmentation must be 2999 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3000 * in the code here. 3001 * 3002 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3003 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3004 * 3005 * The most difficult part of this is that when any of these assumptions 3006 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3007 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3008 * since the per-packet code no longer checks the conditions. This is reflected 3009 * by the calls to these functions throughout the rest of the code, and must be 3010 * maintained if any of the TX path checks change. 3011 */ 3012 3013 void ieee80211_check_fast_xmit(struct sta_info *sta) 3014 { 3015 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3016 struct ieee80211_local *local = sta->local; 3017 struct ieee80211_sub_if_data *sdata = sta->sdata; 3018 struct ieee80211_hdr *hdr = (void *)build.hdr; 3019 struct ieee80211_chanctx_conf *chanctx_conf; 3020 __le16 fc; 3021 3022 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3023 return; 3024 3025 /* Locking here protects both the pointer itself, and against concurrent 3026 * invocations winning data access races to, e.g., the key pointer that 3027 * is used. 3028 * Without it, the invocation of this function right after the key 3029 * pointer changes wouldn't be sufficient, as another CPU could access 3030 * the pointer, then stall, and then do the cache update after the CPU 3031 * that invalidated the key. 3032 * With the locking, such scenarios cannot happen as the check for the 3033 * key and the fast-tx assignment are done atomically, so the CPU that 3034 * modifies the key will either wait or other one will see the key 3035 * cleared/changed already. 3036 */ 3037 spin_lock_bh(&sta->lock); 3038 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3039 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3040 sdata->vif.type == NL80211_IFTYPE_STATION) 3041 goto out; 3042 3043 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3044 goto out; 3045 3046 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3047 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3048 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3049 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3050 goto out; 3051 3052 if (sdata->noack_map) 3053 goto out; 3054 3055 /* fast-xmit doesn't handle fragmentation at all */ 3056 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3057 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3058 goto out; 3059 3060 if (!sdata->vif.valid_links) { 3061 rcu_read_lock(); 3062 chanctx_conf = 3063 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3064 if (!chanctx_conf) { 3065 rcu_read_unlock(); 3066 goto out; 3067 } 3068 build.band = chanctx_conf->def.chan->band; 3069 rcu_read_unlock(); 3070 } else { 3071 /* MLD transmissions must not rely on the band */ 3072 build.band = 0; 3073 } 3074 3075 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3076 3077 switch (sdata->vif.type) { 3078 case NL80211_IFTYPE_ADHOC: 3079 /* DA SA BSSID */ 3080 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3081 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3082 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3083 build.hdr_len = 24; 3084 break; 3085 case NL80211_IFTYPE_STATION: 3086 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3087 /* DA SA BSSID */ 3088 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3089 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3090 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3091 build.hdr_len = 24; 3092 break; 3093 } 3094 3095 if (sdata->u.mgd.use_4addr) { 3096 /* non-regular ethertype cannot use the fastpath */ 3097 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3098 IEEE80211_FCTL_TODS); 3099 /* RA TA DA SA */ 3100 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3101 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3102 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3103 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3104 build.hdr_len = 30; 3105 break; 3106 } 3107 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3108 /* BSSID SA DA */ 3109 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3110 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3111 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3112 build.hdr_len = 24; 3113 break; 3114 case NL80211_IFTYPE_AP_VLAN: 3115 if (sdata->wdev.use_4addr) { 3116 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3117 IEEE80211_FCTL_TODS); 3118 /* RA TA DA SA */ 3119 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3120 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3121 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3122 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3123 build.hdr_len = 30; 3124 break; 3125 } 3126 fallthrough; 3127 case NL80211_IFTYPE_AP: 3128 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3129 /* DA BSSID SA */ 3130 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3131 if (sta->sta.mlo || !sdata->vif.valid_links) { 3132 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3133 } else { 3134 unsigned int link_id = sta->deflink.link_id; 3135 struct ieee80211_link_data *link; 3136 3137 rcu_read_lock(); 3138 link = rcu_dereference(sdata->link[link_id]); 3139 if (WARN_ON(!link)) { 3140 rcu_read_unlock(); 3141 goto out; 3142 } 3143 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3144 rcu_read_unlock(); 3145 } 3146 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3147 build.hdr_len = 24; 3148 break; 3149 default: 3150 /* not handled on fast-xmit */ 3151 goto out; 3152 } 3153 3154 if (sta->sta.wme) { 3155 build.hdr_len += 2; 3156 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3157 } 3158 3159 /* We store the key here so there's no point in using rcu_dereference() 3160 * but that's fine because the code that changes the pointers will call 3161 * this function after doing so. For a single CPU that would be enough, 3162 * for multiple see the comment above. 3163 */ 3164 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3165 if (!build.key) 3166 build.key = rcu_access_pointer(sdata->default_unicast_key); 3167 if (build.key) { 3168 bool gen_iv, iv_spc, mmic; 3169 3170 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3171 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3172 mmic = build.key->conf.flags & 3173 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3174 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3175 3176 /* don't handle software crypto */ 3177 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3178 goto out; 3179 3180 /* Key is being removed */ 3181 if (build.key->flags & KEY_FLAG_TAINTED) 3182 goto out; 3183 3184 switch (build.key->conf.cipher) { 3185 case WLAN_CIPHER_SUITE_CCMP: 3186 case WLAN_CIPHER_SUITE_CCMP_256: 3187 if (gen_iv) 3188 build.pn_offs = build.hdr_len; 3189 if (gen_iv || iv_spc) 3190 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3191 break; 3192 case WLAN_CIPHER_SUITE_GCMP: 3193 case WLAN_CIPHER_SUITE_GCMP_256: 3194 if (gen_iv) 3195 build.pn_offs = build.hdr_len; 3196 if (gen_iv || iv_spc) 3197 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3198 break; 3199 case WLAN_CIPHER_SUITE_TKIP: 3200 /* cannot handle MMIC or IV generation in xmit-fast */ 3201 if (mmic || gen_iv) 3202 goto out; 3203 if (iv_spc) 3204 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3205 break; 3206 case WLAN_CIPHER_SUITE_WEP40: 3207 case WLAN_CIPHER_SUITE_WEP104: 3208 /* cannot handle IV generation in fast-xmit */ 3209 if (gen_iv) 3210 goto out; 3211 if (iv_spc) 3212 build.hdr_len += IEEE80211_WEP_IV_LEN; 3213 break; 3214 case WLAN_CIPHER_SUITE_AES_CMAC: 3215 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3216 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3217 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3218 WARN(1, 3219 "management cipher suite 0x%x enabled for data\n", 3220 build.key->conf.cipher); 3221 goto out; 3222 default: 3223 /* we don't know how to generate IVs for this at all */ 3224 if (WARN_ON(gen_iv)) 3225 goto out; 3226 } 3227 3228 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3229 } 3230 3231 hdr->frame_control = fc; 3232 3233 memcpy(build.hdr + build.hdr_len, 3234 rfc1042_header, sizeof(rfc1042_header)); 3235 build.hdr_len += sizeof(rfc1042_header); 3236 3237 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3238 /* if the kmemdup fails, continue w/o fast_tx */ 3239 3240 out: 3241 /* we might have raced against another call to this function */ 3242 old = rcu_dereference_protected(sta->fast_tx, 3243 lockdep_is_held(&sta->lock)); 3244 rcu_assign_pointer(sta->fast_tx, fast_tx); 3245 if (old) 3246 kfree_rcu(old, rcu_head); 3247 spin_unlock_bh(&sta->lock); 3248 } 3249 3250 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3251 { 3252 struct sta_info *sta; 3253 3254 rcu_read_lock(); 3255 list_for_each_entry_rcu(sta, &local->sta_list, list) 3256 ieee80211_check_fast_xmit(sta); 3257 rcu_read_unlock(); 3258 } 3259 3260 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3261 { 3262 struct ieee80211_local *local = sdata->local; 3263 struct sta_info *sta; 3264 3265 rcu_read_lock(); 3266 3267 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3268 if (sdata != sta->sdata && 3269 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3270 continue; 3271 ieee80211_check_fast_xmit(sta); 3272 } 3273 3274 rcu_read_unlock(); 3275 } 3276 3277 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3278 { 3279 struct ieee80211_fast_tx *fast_tx; 3280 3281 spin_lock_bh(&sta->lock); 3282 fast_tx = rcu_dereference_protected(sta->fast_tx, 3283 lockdep_is_held(&sta->lock)); 3284 RCU_INIT_POINTER(sta->fast_tx, NULL); 3285 spin_unlock_bh(&sta->lock); 3286 3287 if (fast_tx) 3288 kfree_rcu(fast_tx, rcu_head); 3289 } 3290 3291 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3292 struct sk_buff *skb, int headroom) 3293 { 3294 if (skb_headroom(skb) < headroom) { 3295 I802_DEBUG_INC(local->tx_expand_skb_head); 3296 3297 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3298 wiphy_debug(local->hw.wiphy, 3299 "failed to reallocate TX buffer\n"); 3300 return false; 3301 } 3302 } 3303 3304 return true; 3305 } 3306 3307 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3308 struct ieee80211_fast_tx *fast_tx, 3309 struct sk_buff *skb) 3310 { 3311 struct ieee80211_local *local = sdata->local; 3312 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3313 struct ieee80211_hdr *hdr; 3314 struct ethhdr *amsdu_hdr; 3315 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3316 int subframe_len = skb->len - hdr_len; 3317 void *data; 3318 u8 *qc, *h_80211_src, *h_80211_dst; 3319 const u8 *bssid; 3320 3321 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3322 return false; 3323 3324 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3325 return true; 3326 3327 if (!ieee80211_amsdu_realloc_pad(local, skb, 3328 sizeof(*amsdu_hdr) + 3329 local->hw.extra_tx_headroom)) 3330 return false; 3331 3332 data = skb_push(skb, sizeof(*amsdu_hdr)); 3333 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3334 hdr = data; 3335 amsdu_hdr = data + hdr_len; 3336 /* h_80211_src/dst is addr* field within hdr */ 3337 h_80211_src = data + fast_tx->sa_offs; 3338 h_80211_dst = data + fast_tx->da_offs; 3339 3340 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3341 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3342 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3343 3344 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3345 * fields needs to be changed to BSSID for A-MSDU frames depending 3346 * on FromDS/ToDS values. 3347 */ 3348 switch (sdata->vif.type) { 3349 case NL80211_IFTYPE_STATION: 3350 bssid = sdata->vif.cfg.ap_addr; 3351 break; 3352 case NL80211_IFTYPE_AP: 3353 case NL80211_IFTYPE_AP_VLAN: 3354 bssid = sdata->vif.addr; 3355 break; 3356 default: 3357 bssid = NULL; 3358 } 3359 3360 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3361 ether_addr_copy(h_80211_src, bssid); 3362 3363 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3364 ether_addr_copy(h_80211_dst, bssid); 3365 3366 qc = ieee80211_get_qos_ctl(hdr); 3367 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3368 3369 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3370 3371 return true; 3372 } 3373 3374 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3375 struct sta_info *sta, 3376 struct ieee80211_fast_tx *fast_tx, 3377 struct sk_buff *skb) 3378 { 3379 struct ieee80211_local *local = sdata->local; 3380 struct fq *fq = &local->fq; 3381 struct fq_tin *tin; 3382 struct fq_flow *flow; 3383 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3384 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3385 struct txq_info *txqi; 3386 struct sk_buff **frag_tail, *head; 3387 int subframe_len = skb->len - ETH_ALEN; 3388 u8 max_subframes = sta->sta.max_amsdu_subframes; 3389 int max_frags = local->hw.max_tx_fragments; 3390 int max_amsdu_len = sta->sta.max_amsdu_len; 3391 int orig_truesize; 3392 u32 flow_idx; 3393 __be16 len; 3394 void *data; 3395 bool ret = false; 3396 unsigned int orig_len; 3397 int n = 2, nfrags, pad = 0; 3398 u16 hdrlen; 3399 3400 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3401 return false; 3402 3403 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3404 return false; 3405 3406 if (skb_is_gso(skb)) 3407 return false; 3408 3409 if (!txq) 3410 return false; 3411 3412 txqi = to_txq_info(txq); 3413 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3414 return false; 3415 3416 if (sta->sta.max_rc_amsdu_len) 3417 max_amsdu_len = min_t(int, max_amsdu_len, 3418 sta->sta.max_rc_amsdu_len); 3419 3420 if (sta->sta.max_tid_amsdu_len[tid]) 3421 max_amsdu_len = min_t(int, max_amsdu_len, 3422 sta->sta.max_tid_amsdu_len[tid]); 3423 3424 flow_idx = fq_flow_idx(fq, skb); 3425 3426 spin_lock_bh(&fq->lock); 3427 3428 /* TODO: Ideally aggregation should be done on dequeue to remain 3429 * responsive to environment changes. 3430 */ 3431 3432 tin = &txqi->tin; 3433 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3434 head = skb_peek_tail(&flow->queue); 3435 if (!head || skb_is_gso(head)) 3436 goto out; 3437 3438 orig_truesize = head->truesize; 3439 orig_len = head->len; 3440 3441 if (skb->len + head->len > max_amsdu_len) 3442 goto out; 3443 3444 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3445 nfrags += 1 + skb_shinfo(head)->nr_frags; 3446 frag_tail = &skb_shinfo(head)->frag_list; 3447 while (*frag_tail) { 3448 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3449 frag_tail = &(*frag_tail)->next; 3450 n++; 3451 } 3452 3453 if (max_subframes && n > max_subframes) 3454 goto out; 3455 3456 if (max_frags && nfrags > max_frags) 3457 goto out; 3458 3459 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3460 goto out; 3461 3462 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3463 goto out; 3464 3465 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3466 * and frag_tail should be &skb_shinfo(head)->frag_list. 3467 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3468 * Reload frag_tail to have it pointing to the correct place. 3469 */ 3470 if (n == 2) 3471 frag_tail = &skb_shinfo(head)->frag_list; 3472 3473 /* 3474 * Pad out the previous subframe to a multiple of 4 by adding the 3475 * padding to the next one, that's being added. Note that head->len 3476 * is the length of the full A-MSDU, but that works since each time 3477 * we add a new subframe we pad out the previous one to a multiple 3478 * of 4 and thus it no longer matters in the next round. 3479 */ 3480 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3481 if ((head->len - hdrlen) & 3) 3482 pad = 4 - ((head->len - hdrlen) & 3); 3483 3484 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3485 2 + pad)) 3486 goto out_recalc; 3487 3488 ret = true; 3489 data = skb_push(skb, ETH_ALEN + 2); 3490 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3491 3492 data += 2 * ETH_ALEN; 3493 len = cpu_to_be16(subframe_len); 3494 memcpy(data, &len, 2); 3495 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3496 3497 memset(skb_push(skb, pad), 0, pad); 3498 3499 head->len += skb->len; 3500 head->data_len += skb->len; 3501 *frag_tail = skb; 3502 3503 out_recalc: 3504 fq->memory_usage += head->truesize - orig_truesize; 3505 if (head->len != orig_len) { 3506 flow->backlog += head->len - orig_len; 3507 tin->backlog_bytes += head->len - orig_len; 3508 } 3509 out: 3510 spin_unlock_bh(&fq->lock); 3511 3512 return ret; 3513 } 3514 3515 /* 3516 * Can be called while the sta lock is held. Anything that can cause packets to 3517 * be generated will cause deadlock! 3518 */ 3519 static ieee80211_tx_result 3520 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3521 struct sta_info *sta, u8 pn_offs, 3522 struct ieee80211_key *key, 3523 struct ieee80211_tx_data *tx) 3524 { 3525 struct sk_buff *skb = tx->skb; 3526 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3527 struct ieee80211_hdr *hdr = (void *)skb->data; 3528 u8 tid = IEEE80211_NUM_TIDS; 3529 3530 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3531 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3532 return TX_DROP; 3533 3534 if (key) 3535 info->control.hw_key = &key->conf; 3536 3537 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3538 3539 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3540 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3541 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3542 } else { 3543 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3544 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3545 sdata->sequence_number += 0x10; 3546 } 3547 3548 if (skb_shinfo(skb)->gso_size) 3549 sta->deflink.tx_stats.msdu[tid] += 3550 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3551 else 3552 sta->deflink.tx_stats.msdu[tid]++; 3553 3554 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3555 3556 /* statistics normally done by ieee80211_tx_h_stats (but that 3557 * has to consider fragmentation, so is more complex) 3558 */ 3559 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3560 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3561 3562 if (pn_offs) { 3563 u64 pn; 3564 u8 *crypto_hdr = skb->data + pn_offs; 3565 3566 switch (key->conf.cipher) { 3567 case WLAN_CIPHER_SUITE_CCMP: 3568 case WLAN_CIPHER_SUITE_CCMP_256: 3569 case WLAN_CIPHER_SUITE_GCMP: 3570 case WLAN_CIPHER_SUITE_GCMP_256: 3571 pn = atomic64_inc_return(&key->conf.tx_pn); 3572 crypto_hdr[0] = pn; 3573 crypto_hdr[1] = pn >> 8; 3574 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3575 crypto_hdr[4] = pn >> 16; 3576 crypto_hdr[5] = pn >> 24; 3577 crypto_hdr[6] = pn >> 32; 3578 crypto_hdr[7] = pn >> 40; 3579 break; 3580 } 3581 } 3582 3583 return TX_CONTINUE; 3584 } 3585 3586 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3587 struct sta_info *sta, 3588 struct ieee80211_fast_tx *fast_tx, 3589 struct sk_buff *skb) 3590 { 3591 struct ieee80211_local *local = sdata->local; 3592 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3593 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3594 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3595 struct ethhdr eth; 3596 struct ieee80211_tx_info *info; 3597 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3598 struct ieee80211_tx_data tx; 3599 ieee80211_tx_result r; 3600 struct tid_ampdu_tx *tid_tx = NULL; 3601 u8 tid = IEEE80211_NUM_TIDS; 3602 3603 /* control port protocol needs a lot of special handling */ 3604 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3605 return false; 3606 3607 /* only RFC 1042 SNAP */ 3608 if (ethertype < ETH_P_802_3_MIN) 3609 return false; 3610 3611 /* don't handle TX status request here either */ 3612 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3613 return false; 3614 3615 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3616 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3617 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3618 if (tid_tx) { 3619 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3620 return false; 3621 if (tid_tx->timeout) 3622 tid_tx->last_tx = jiffies; 3623 } 3624 } 3625 3626 /* after this point (skb is modified) we cannot return false */ 3627 3628 skb = skb_share_check(skb, GFP_ATOMIC); 3629 if (unlikely(!skb)) 3630 return true; 3631 3632 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3633 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3634 return true; 3635 3636 /* will not be crypto-handled beyond what we do here, so use false 3637 * as the may-encrypt argument for the resize to not account for 3638 * more room than we already have in 'extra_head' 3639 */ 3640 if (unlikely(ieee80211_skb_resize(sdata, skb, 3641 max_t(int, extra_head + hw_headroom - 3642 skb_headroom(skb), 0), 3643 ENCRYPT_NO))) { 3644 kfree_skb(skb); 3645 return true; 3646 } 3647 3648 memcpy(ð, skb->data, ETH_HLEN - 2); 3649 hdr = skb_push(skb, extra_head); 3650 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3651 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3652 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3653 3654 info = IEEE80211_SKB_CB(skb); 3655 memset(info, 0, sizeof(*info)); 3656 info->band = fast_tx->band; 3657 info->control.vif = &sdata->vif; 3658 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3659 IEEE80211_TX_CTL_DONTFRAG | 3660 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3661 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3662 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3663 IEEE80211_TX_CTRL_MLO_LINK); 3664 3665 #ifdef CONFIG_MAC80211_DEBUGFS 3666 if (local->force_tx_status) 3667 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3668 #endif 3669 3670 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3671 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3672 *ieee80211_get_qos_ctl(hdr) = tid; 3673 } 3674 3675 __skb_queue_head_init(&tx.skbs); 3676 3677 tx.flags = IEEE80211_TX_UNICAST; 3678 tx.local = local; 3679 tx.sdata = sdata; 3680 tx.sta = sta; 3681 tx.key = fast_tx->key; 3682 3683 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3684 return true; 3685 3686 tx.skb = skb; 3687 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3688 fast_tx->key, &tx); 3689 tx.skb = NULL; 3690 if (r == TX_DROP) { 3691 kfree_skb(skb); 3692 return true; 3693 } 3694 3695 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3696 sdata = container_of(sdata->bss, 3697 struct ieee80211_sub_if_data, u.ap); 3698 3699 __skb_queue_tail(&tx.skbs, skb); 3700 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3701 return true; 3702 } 3703 3704 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3705 struct ieee80211_txq *txq) 3706 { 3707 struct ieee80211_local *local = hw_to_local(hw); 3708 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3709 struct ieee80211_hdr *hdr; 3710 struct sk_buff *skb = NULL; 3711 struct fq *fq = &local->fq; 3712 struct fq_tin *tin = &txqi->tin; 3713 struct ieee80211_tx_info *info; 3714 struct ieee80211_tx_data tx; 3715 ieee80211_tx_result r; 3716 struct ieee80211_vif *vif = txq->vif; 3717 3718 WARN_ON_ONCE(softirq_count() == 0); 3719 3720 if (!ieee80211_txq_airtime_check(hw, txq)) 3721 return NULL; 3722 3723 begin: 3724 spin_lock_bh(&fq->lock); 3725 3726 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3727 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3728 goto out; 3729 3730 if (vif->txqs_stopped[txq->ac]) { 3731 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3732 goto out; 3733 } 3734 3735 /* Make sure fragments stay together. */ 3736 skb = __skb_dequeue(&txqi->frags); 3737 if (unlikely(skb)) { 3738 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3739 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3740 goto out; 3741 IEEE80211_SKB_CB(skb)->control.flags &= 3742 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3743 } else { 3744 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3745 } 3746 3747 if (!skb) 3748 goto out; 3749 3750 spin_unlock_bh(&fq->lock); 3751 3752 hdr = (struct ieee80211_hdr *)skb->data; 3753 info = IEEE80211_SKB_CB(skb); 3754 3755 memset(&tx, 0, sizeof(tx)); 3756 __skb_queue_head_init(&tx.skbs); 3757 tx.local = local; 3758 tx.skb = skb; 3759 tx.sdata = vif_to_sdata(info->control.vif); 3760 3761 if (txq->sta) { 3762 tx.sta = container_of(txq->sta, struct sta_info, sta); 3763 /* 3764 * Drop unicast frames to unauthorised stations unless they are 3765 * injected frames or EAPOL frames from the local station. 3766 */ 3767 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3768 ieee80211_is_data(hdr->frame_control) && 3769 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3770 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3771 !is_multicast_ether_addr(hdr->addr1) && 3772 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3773 (!(info->control.flags & 3774 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3775 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3776 NULL)))) { 3777 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3778 ieee80211_free_txskb(&local->hw, skb); 3779 goto begin; 3780 } 3781 } 3782 3783 /* 3784 * The key can be removed while the packet was queued, so need to call 3785 * this here to get the current key. 3786 */ 3787 r = ieee80211_tx_h_select_key(&tx); 3788 if (r != TX_CONTINUE) { 3789 ieee80211_free_txskb(&local->hw, skb); 3790 goto begin; 3791 } 3792 3793 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3794 info->flags |= IEEE80211_TX_CTL_AMPDU; 3795 else 3796 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3797 3798 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3799 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3800 r = ieee80211_tx_h_rate_ctrl(&tx); 3801 if (r != TX_CONTINUE) { 3802 ieee80211_free_txskb(&local->hw, skb); 3803 goto begin; 3804 } 3805 } 3806 goto encap_out; 3807 } 3808 3809 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3810 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3811 sta); 3812 u8 pn_offs = 0; 3813 3814 if (tx.key && 3815 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3816 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3817 3818 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3819 tx.key, &tx); 3820 if (r != TX_CONTINUE) { 3821 ieee80211_free_txskb(&local->hw, skb); 3822 goto begin; 3823 } 3824 } else { 3825 if (invoke_tx_handlers_late(&tx)) 3826 goto begin; 3827 3828 skb = __skb_dequeue(&tx.skbs); 3829 3830 if (!skb_queue_empty(&tx.skbs)) { 3831 spin_lock_bh(&fq->lock); 3832 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3833 spin_unlock_bh(&fq->lock); 3834 } 3835 } 3836 3837 if (skb_has_frag_list(skb) && 3838 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3839 if (skb_linearize(skb)) { 3840 ieee80211_free_txskb(&local->hw, skb); 3841 goto begin; 3842 } 3843 } 3844 3845 switch (tx.sdata->vif.type) { 3846 case NL80211_IFTYPE_MONITOR: 3847 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3848 vif = &tx.sdata->vif; 3849 break; 3850 } 3851 tx.sdata = rcu_dereference(local->monitor_sdata); 3852 if (tx.sdata) { 3853 vif = &tx.sdata->vif; 3854 info->hw_queue = 3855 vif->hw_queue[skb_get_queue_mapping(skb)]; 3856 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3857 ieee80211_free_txskb(&local->hw, skb); 3858 goto begin; 3859 } else { 3860 vif = NULL; 3861 } 3862 break; 3863 case NL80211_IFTYPE_AP_VLAN: 3864 tx.sdata = container_of(tx.sdata->bss, 3865 struct ieee80211_sub_if_data, u.ap); 3866 fallthrough; 3867 default: 3868 vif = &tx.sdata->vif; 3869 break; 3870 } 3871 3872 encap_out: 3873 IEEE80211_SKB_CB(skb)->control.vif = vif; 3874 3875 if (tx.sta && 3876 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3877 bool ampdu = txq->ac != IEEE80211_AC_VO; 3878 u32 airtime; 3879 3880 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3881 skb->len, ampdu); 3882 if (airtime) { 3883 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3884 ieee80211_sta_update_pending_airtime(local, tx.sta, 3885 txq->ac, 3886 airtime, 3887 false); 3888 } 3889 } 3890 3891 return skb; 3892 3893 out: 3894 spin_unlock_bh(&fq->lock); 3895 3896 return skb; 3897 } 3898 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3899 3900 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3901 { 3902 struct airtime_info *air_info = &sta->airtime[ac]; 3903 3904 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3905 } 3906 3907 static void 3908 ieee80211_txq_set_active(struct txq_info *txqi) 3909 { 3910 struct sta_info *sta; 3911 3912 if (!txqi->txq.sta) 3913 return; 3914 3915 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3916 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 3917 } 3918 3919 static bool 3920 ieee80211_txq_keep_active(struct txq_info *txqi) 3921 { 3922 struct sta_info *sta; 3923 u32 diff; 3924 3925 if (!txqi->txq.sta) 3926 return false; 3927 3928 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3929 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 3930 return false; 3931 3932 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 3933 3934 return diff <= AIRTIME_ACTIVE_DURATION; 3935 } 3936 3937 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3938 { 3939 struct ieee80211_local *local = hw_to_local(hw); 3940 struct ieee80211_txq *ret = NULL; 3941 struct txq_info *txqi = NULL, *head = NULL; 3942 bool found_eligible_txq = false; 3943 3944 spin_lock_bh(&local->active_txq_lock[ac]); 3945 3946 if (!local->schedule_round[ac]) 3947 goto out; 3948 3949 begin: 3950 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3951 struct txq_info, 3952 schedule_order); 3953 if (!txqi) 3954 goto out; 3955 3956 if (txqi == head) { 3957 if (!found_eligible_txq) 3958 goto out; 3959 else 3960 found_eligible_txq = false; 3961 } 3962 3963 if (!head) 3964 head = txqi; 3965 3966 if (txqi->txq.sta) { 3967 struct sta_info *sta = container_of(txqi->txq.sta, 3968 struct sta_info, sta); 3969 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3970 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 3971 3972 if (aql_check) 3973 found_eligible_txq = true; 3974 3975 if (deficit < 0) 3976 sta->airtime[txqi->txq.ac].deficit += 3977 sta->airtime_weight; 3978 3979 if (deficit < 0 || !aql_check) { 3980 list_move_tail(&txqi->schedule_order, 3981 &local->active_txqs[txqi->txq.ac]); 3982 goto begin; 3983 } 3984 } 3985 3986 if (txqi->schedule_round == local->schedule_round[ac]) 3987 goto out; 3988 3989 list_del_init(&txqi->schedule_order); 3990 txqi->schedule_round = local->schedule_round[ac]; 3991 ret = &txqi->txq; 3992 3993 out: 3994 spin_unlock_bh(&local->active_txq_lock[ac]); 3995 return ret; 3996 } 3997 EXPORT_SYMBOL(ieee80211_next_txq); 3998 3999 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4000 struct ieee80211_txq *txq, 4001 bool force) 4002 { 4003 struct ieee80211_local *local = hw_to_local(hw); 4004 struct txq_info *txqi = to_txq_info(txq); 4005 bool has_queue; 4006 4007 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4008 4009 has_queue = force || txq_has_queue(txq); 4010 if (list_empty(&txqi->schedule_order) && 4011 (has_queue || ieee80211_txq_keep_active(txqi))) { 4012 /* If airtime accounting is active, always enqueue STAs at the 4013 * head of the list to ensure that they only get moved to the 4014 * back by the airtime DRR scheduler once they have a negative 4015 * deficit. A station that already has a negative deficit will 4016 * get immediately moved to the back of the list on the next 4017 * call to ieee80211_next_txq(). 4018 */ 4019 if (txqi->txq.sta && local->airtime_flags && has_queue && 4020 wiphy_ext_feature_isset(local->hw.wiphy, 4021 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4022 list_add(&txqi->schedule_order, 4023 &local->active_txqs[txq->ac]); 4024 else 4025 list_add_tail(&txqi->schedule_order, 4026 &local->active_txqs[txq->ac]); 4027 if (has_queue) 4028 ieee80211_txq_set_active(txqi); 4029 } 4030 4031 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4032 } 4033 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4034 4035 DEFINE_STATIC_KEY_FALSE(aql_disable); 4036 4037 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4038 struct ieee80211_txq *txq) 4039 { 4040 struct sta_info *sta; 4041 struct ieee80211_local *local = hw_to_local(hw); 4042 4043 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4044 return true; 4045 4046 if (static_branch_unlikely(&aql_disable)) 4047 return true; 4048 4049 if (!txq->sta) 4050 return true; 4051 4052 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4053 return true; 4054 4055 sta = container_of(txq->sta, struct sta_info, sta); 4056 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4057 sta->airtime[txq->ac].aql_limit_low) 4058 return true; 4059 4060 if (atomic_read(&local->aql_total_pending_airtime) < 4061 local->aql_threshold && 4062 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4063 sta->airtime[txq->ac].aql_limit_high) 4064 return true; 4065 4066 return false; 4067 } 4068 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4069 4070 static bool 4071 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4072 { 4073 unsigned int num_txq = 0; 4074 struct txq_info *txq; 4075 u32 aql_limit; 4076 4077 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4078 return true; 4079 4080 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4081 num_txq++; 4082 4083 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4084 local->aql_txq_limit_high[ac]; 4085 4086 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4087 } 4088 4089 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4090 struct ieee80211_txq *txq) 4091 { 4092 struct ieee80211_local *local = hw_to_local(hw); 4093 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4094 struct sta_info *sta; 4095 u8 ac = txq->ac; 4096 4097 spin_lock_bh(&local->active_txq_lock[ac]); 4098 4099 if (!txqi->txq.sta) 4100 goto out; 4101 4102 if (list_empty(&txqi->schedule_order)) 4103 goto out; 4104 4105 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4106 goto out; 4107 4108 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4109 schedule_order) { 4110 if (iter == txqi) 4111 break; 4112 4113 if (!iter->txq.sta) { 4114 list_move_tail(&iter->schedule_order, 4115 &local->active_txqs[ac]); 4116 continue; 4117 } 4118 sta = container_of(iter->txq.sta, struct sta_info, sta); 4119 if (ieee80211_sta_deficit(sta, ac) < 0) 4120 sta->airtime[ac].deficit += sta->airtime_weight; 4121 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4122 } 4123 4124 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4125 if (sta->airtime[ac].deficit >= 0) 4126 goto out; 4127 4128 sta->airtime[ac].deficit += sta->airtime_weight; 4129 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4130 spin_unlock_bh(&local->active_txq_lock[ac]); 4131 4132 return false; 4133 out: 4134 if (!list_empty(&txqi->schedule_order)) 4135 list_del_init(&txqi->schedule_order); 4136 spin_unlock_bh(&local->active_txq_lock[ac]); 4137 4138 return true; 4139 } 4140 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4141 4142 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4143 { 4144 struct ieee80211_local *local = hw_to_local(hw); 4145 4146 spin_lock_bh(&local->active_txq_lock[ac]); 4147 4148 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4149 local->schedule_round[ac]++; 4150 if (!local->schedule_round[ac]) 4151 local->schedule_round[ac]++; 4152 } else { 4153 local->schedule_round[ac] = 0; 4154 } 4155 4156 spin_unlock_bh(&local->active_txq_lock[ac]); 4157 } 4158 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4159 4160 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4161 struct net_device *dev, 4162 u32 info_flags, 4163 u32 ctrl_flags, 4164 u64 *cookie) 4165 { 4166 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4167 struct ieee80211_local *local = sdata->local; 4168 struct sta_info *sta; 4169 struct sk_buff *next; 4170 int len = skb->len; 4171 4172 if (unlikely(skb->len < ETH_HLEN)) { 4173 kfree_skb(skb); 4174 return; 4175 } 4176 4177 rcu_read_lock(); 4178 4179 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4180 goto out_free; 4181 4182 if (IS_ERR(sta)) 4183 sta = NULL; 4184 4185 if (local->ops->wake_tx_queue) { 4186 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4187 skb_set_queue_mapping(skb, queue); 4188 skb_get_hash(skb); 4189 } 4190 4191 ieee80211_aggr_check(sdata, sta, skb); 4192 4193 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4194 4195 if (sta) { 4196 struct ieee80211_fast_tx *fast_tx; 4197 4198 fast_tx = rcu_dereference(sta->fast_tx); 4199 4200 if (fast_tx && 4201 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4202 goto out; 4203 } 4204 4205 if (skb_is_gso(skb)) { 4206 struct sk_buff *segs; 4207 4208 segs = skb_gso_segment(skb, 0); 4209 if (IS_ERR(segs)) { 4210 goto out_free; 4211 } else if (segs) { 4212 consume_skb(skb); 4213 skb = segs; 4214 } 4215 } else { 4216 /* we cannot process non-linear frames on this path */ 4217 if (skb_linearize(skb)) 4218 goto out_free; 4219 4220 /* the frame could be fragmented, software-encrypted, and other 4221 * things so we cannot really handle checksum offload with it - 4222 * fix it up in software before we handle anything else. 4223 */ 4224 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4225 skb_set_transport_header(skb, 4226 skb_checksum_start_offset(skb)); 4227 if (skb_checksum_help(skb)) 4228 goto out_free; 4229 } 4230 } 4231 4232 skb_list_walk_safe(skb, skb, next) { 4233 skb_mark_not_on_list(skb); 4234 4235 if (skb->protocol == sdata->control_port_protocol) 4236 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4237 4238 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4239 sta, ctrl_flags, cookie); 4240 if (IS_ERR(skb)) { 4241 kfree_skb_list(next); 4242 goto out; 4243 } 4244 4245 dev_sw_netstats_tx_add(dev, 1, skb->len); 4246 4247 ieee80211_xmit(sdata, sta, skb); 4248 } 4249 goto out; 4250 out_free: 4251 kfree_skb(skb); 4252 len = 0; 4253 out: 4254 if (len) 4255 ieee80211_tpt_led_trig_tx(local, len); 4256 rcu_read_unlock(); 4257 } 4258 4259 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4260 { 4261 struct ethhdr *eth; 4262 int err; 4263 4264 err = skb_ensure_writable(skb, ETH_HLEN); 4265 if (unlikely(err)) 4266 return err; 4267 4268 eth = (void *)skb->data; 4269 ether_addr_copy(eth->h_dest, sta->sta.addr); 4270 4271 return 0; 4272 } 4273 4274 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4275 struct net_device *dev) 4276 { 4277 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4278 const struct ethhdr *eth = (void *)skb->data; 4279 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4280 __be16 ethertype; 4281 4282 switch (sdata->vif.type) { 4283 case NL80211_IFTYPE_AP_VLAN: 4284 if (sdata->u.vlan.sta) 4285 return false; 4286 if (sdata->wdev.use_4addr) 4287 return false; 4288 fallthrough; 4289 case NL80211_IFTYPE_AP: 4290 /* check runtime toggle for this bss */ 4291 if (!sdata->bss->multicast_to_unicast) 4292 return false; 4293 break; 4294 default: 4295 return false; 4296 } 4297 4298 /* multicast to unicast conversion only for some payload */ 4299 ethertype = eth->h_proto; 4300 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4301 ethertype = ethvlan->h_vlan_encapsulated_proto; 4302 switch (ethertype) { 4303 case htons(ETH_P_ARP): 4304 case htons(ETH_P_IP): 4305 case htons(ETH_P_IPV6): 4306 break; 4307 default: 4308 return false; 4309 } 4310 4311 return true; 4312 } 4313 4314 static void 4315 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4316 struct sk_buff_head *queue) 4317 { 4318 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4319 struct ieee80211_local *local = sdata->local; 4320 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4321 struct sta_info *sta, *first = NULL; 4322 struct sk_buff *cloned_skb; 4323 4324 rcu_read_lock(); 4325 4326 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4327 if (sdata != sta->sdata) 4328 /* AP-VLAN mismatch */ 4329 continue; 4330 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4331 /* do not send back to source */ 4332 continue; 4333 if (!first) { 4334 first = sta; 4335 continue; 4336 } 4337 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4338 if (!cloned_skb) 4339 goto multicast; 4340 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4341 dev_kfree_skb(cloned_skb); 4342 goto multicast; 4343 } 4344 __skb_queue_tail(queue, cloned_skb); 4345 } 4346 4347 if (likely(first)) { 4348 if (unlikely(ieee80211_change_da(skb, first))) 4349 goto multicast; 4350 __skb_queue_tail(queue, skb); 4351 } else { 4352 /* no STA connected, drop */ 4353 kfree_skb(skb); 4354 skb = NULL; 4355 } 4356 4357 goto out; 4358 multicast: 4359 __skb_queue_purge(queue); 4360 __skb_queue_tail(queue, skb); 4361 out: 4362 rcu_read_unlock(); 4363 } 4364 4365 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4366 struct sk_buff *skb, u32 ctrl_flags, 4367 unsigned int link_id) 4368 { 4369 struct sk_buff *out; 4370 4371 out = skb_copy(skb, GFP_ATOMIC); 4372 if (!out) 4373 return; 4374 4375 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4376 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4377 } 4378 4379 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4380 struct sk_buff *skb) 4381 { 4382 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4383 unsigned long links = sdata->vif.valid_links; 4384 unsigned int link; 4385 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4386 4387 if (hweight16(links) == 1) { 4388 ctrl_flags |= u32_encode_bits(ffs(links) - 1, 4389 IEEE80211_TX_CTRL_MLO_LINK); 4390 4391 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4392 NULL); 4393 return; 4394 } 4395 4396 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4397 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4398 ctrl_flags = 0; 4399 } 4400 kfree_skb(skb); 4401 } 4402 4403 /** 4404 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4405 * @skb: packet to be sent 4406 * @dev: incoming interface 4407 * 4408 * On failure skb will be freed. 4409 */ 4410 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4411 struct net_device *dev) 4412 { 4413 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4414 const struct ethhdr *eth = (void *)skb->data; 4415 4416 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4417 goto normal; 4418 4419 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4420 struct sk_buff_head queue; 4421 4422 __skb_queue_head_init(&queue); 4423 ieee80211_convert_to_unicast(skb, dev, &queue); 4424 while ((skb = __skb_dequeue(&queue))) 4425 __ieee80211_subif_start_xmit(skb, dev, 0, 4426 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4427 NULL); 4428 } else if (sdata->vif.valid_links && 4429 sdata->vif.type == NL80211_IFTYPE_AP && 4430 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4431 ieee80211_mlo_multicast_tx(dev, skb); 4432 } else { 4433 normal: 4434 __ieee80211_subif_start_xmit(skb, dev, 0, 4435 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4436 NULL); 4437 } 4438 4439 return NETDEV_TX_OK; 4440 } 4441 4442 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4443 struct sk_buff *skb, struct sta_info *sta, 4444 bool txpending) 4445 { 4446 struct ieee80211_local *local = sdata->local; 4447 struct ieee80211_tx_control control = {}; 4448 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4449 struct ieee80211_sta *pubsta = NULL; 4450 unsigned long flags; 4451 int q = info->hw_queue; 4452 4453 if (sta) 4454 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4455 4456 ieee80211_tpt_led_trig_tx(local, skb->len); 4457 4458 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4459 return true; 4460 4461 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4462 4463 if (local->queue_stop_reasons[q] || 4464 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4465 if (txpending) 4466 skb_queue_head(&local->pending[q], skb); 4467 else 4468 skb_queue_tail(&local->pending[q], skb); 4469 4470 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4471 4472 return false; 4473 } 4474 4475 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4476 4477 if (sta && sta->uploaded) 4478 pubsta = &sta->sta; 4479 4480 control.sta = pubsta; 4481 4482 drv_tx(local, &control, skb); 4483 4484 return true; 4485 } 4486 4487 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4488 struct net_device *dev, struct sta_info *sta, 4489 struct ieee80211_key *key, struct sk_buff *skb) 4490 { 4491 struct ieee80211_tx_info *info; 4492 struct ieee80211_local *local = sdata->local; 4493 struct tid_ampdu_tx *tid_tx; 4494 u8 tid; 4495 4496 if (local->ops->wake_tx_queue) { 4497 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4498 skb_set_queue_mapping(skb, queue); 4499 skb_get_hash(skb); 4500 } 4501 4502 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4503 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4504 goto out_free; 4505 4506 skb = skb_share_check(skb, GFP_ATOMIC); 4507 if (unlikely(!skb)) 4508 return; 4509 4510 info = IEEE80211_SKB_CB(skb); 4511 memset(info, 0, sizeof(*info)); 4512 4513 ieee80211_aggr_check(sdata, sta, skb); 4514 4515 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4516 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4517 if (tid_tx) { 4518 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4519 /* fall back to non-offload slow path */ 4520 __ieee80211_subif_start_xmit(skb, dev, 0, 4521 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4522 NULL); 4523 return; 4524 } 4525 4526 info->flags |= IEEE80211_TX_CTL_AMPDU; 4527 if (tid_tx->timeout) 4528 tid_tx->last_tx = jiffies; 4529 } 4530 4531 if (unlikely(skb->sk && 4532 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4533 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4534 &info->flags, NULL); 4535 4536 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4537 4538 dev_sw_netstats_tx_add(dev, 1, skb->len); 4539 4540 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4541 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 4542 4543 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4544 sdata = container_of(sdata->bss, 4545 struct ieee80211_sub_if_data, u.ap); 4546 4547 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4548 info->control.vif = &sdata->vif; 4549 4550 if (key) 4551 info->control.hw_key = &key->conf; 4552 4553 ieee80211_tx_8023(sdata, skb, sta, false); 4554 4555 return; 4556 4557 out_free: 4558 kfree_skb(skb); 4559 } 4560 4561 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4562 struct net_device *dev) 4563 { 4564 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4565 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4566 struct ieee80211_key *key; 4567 struct sta_info *sta; 4568 4569 if (unlikely(skb->len < ETH_HLEN)) { 4570 kfree_skb(skb); 4571 return NETDEV_TX_OK; 4572 } 4573 4574 rcu_read_lock(); 4575 4576 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4577 kfree_skb(skb); 4578 goto out; 4579 } 4580 4581 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4582 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4583 sdata->control_port_protocol == ehdr->h_proto)) 4584 goto skip_offload; 4585 4586 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4587 if (!key) 4588 key = rcu_dereference(sdata->default_unicast_key); 4589 4590 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4591 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4592 goto skip_offload; 4593 4594 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4595 goto out; 4596 4597 skip_offload: 4598 ieee80211_subif_start_xmit(skb, dev); 4599 out: 4600 rcu_read_unlock(); 4601 4602 return NETDEV_TX_OK; 4603 } 4604 4605 struct sk_buff * 4606 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4607 struct sk_buff *skb, u32 info_flags) 4608 { 4609 struct ieee80211_hdr *hdr; 4610 struct ieee80211_tx_data tx = { 4611 .local = sdata->local, 4612 .sdata = sdata, 4613 }; 4614 struct sta_info *sta; 4615 4616 rcu_read_lock(); 4617 4618 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4619 kfree_skb(skb); 4620 skb = ERR_PTR(-EINVAL); 4621 goto out; 4622 } 4623 4624 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4625 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4626 if (IS_ERR(skb)) 4627 goto out; 4628 4629 hdr = (void *)skb->data; 4630 tx.sta = sta_info_get(sdata, hdr->addr1); 4631 tx.skb = skb; 4632 4633 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4634 rcu_read_unlock(); 4635 kfree_skb(skb); 4636 return ERR_PTR(-EINVAL); 4637 } 4638 4639 out: 4640 rcu_read_unlock(); 4641 return skb; 4642 } 4643 4644 /* 4645 * ieee80211_clear_tx_pending may not be called in a context where 4646 * it is possible that it packets could come in again. 4647 */ 4648 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4649 { 4650 struct sk_buff *skb; 4651 int i; 4652 4653 for (i = 0; i < local->hw.queues; i++) { 4654 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4655 ieee80211_free_txskb(&local->hw, skb); 4656 } 4657 } 4658 4659 /* 4660 * Returns false if the frame couldn't be transmitted but was queued instead, 4661 * which in this case means re-queued -- take as an indication to stop sending 4662 * more pending frames. 4663 */ 4664 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4665 struct sk_buff *skb) 4666 { 4667 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4668 struct ieee80211_sub_if_data *sdata; 4669 struct sta_info *sta; 4670 struct ieee80211_hdr *hdr; 4671 bool result; 4672 struct ieee80211_chanctx_conf *chanctx_conf; 4673 4674 sdata = vif_to_sdata(info->control.vif); 4675 4676 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4677 /* update band only for non-MLD */ 4678 if (!sdata->vif.valid_links) { 4679 chanctx_conf = 4680 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4681 if (unlikely(!chanctx_conf)) { 4682 dev_kfree_skb(skb); 4683 return true; 4684 } 4685 info->band = chanctx_conf->def.chan->band; 4686 } 4687 result = ieee80211_tx(sdata, NULL, skb, true); 4688 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4689 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4690 dev_kfree_skb(skb); 4691 return true; 4692 } 4693 4694 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4695 sta = NULL; 4696 4697 result = ieee80211_tx_8023(sdata, skb, sta, true); 4698 } else { 4699 struct sk_buff_head skbs; 4700 4701 __skb_queue_head_init(&skbs); 4702 __skb_queue_tail(&skbs, skb); 4703 4704 hdr = (struct ieee80211_hdr *)skb->data; 4705 sta = sta_info_get(sdata, hdr->addr1); 4706 4707 result = __ieee80211_tx(local, &skbs, sta, true); 4708 } 4709 4710 return result; 4711 } 4712 4713 /* 4714 * Transmit all pending packets. Called from tasklet. 4715 */ 4716 void ieee80211_tx_pending(struct tasklet_struct *t) 4717 { 4718 struct ieee80211_local *local = from_tasklet(local, t, 4719 tx_pending_tasklet); 4720 unsigned long flags; 4721 int i; 4722 bool txok; 4723 4724 rcu_read_lock(); 4725 4726 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4727 for (i = 0; i < local->hw.queues; i++) { 4728 /* 4729 * If queue is stopped by something other than due to pending 4730 * frames, or we have no pending frames, proceed to next queue. 4731 */ 4732 if (local->queue_stop_reasons[i] || 4733 skb_queue_empty(&local->pending[i])) 4734 continue; 4735 4736 while (!skb_queue_empty(&local->pending[i])) { 4737 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4738 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4739 4740 if (WARN_ON(!info->control.vif)) { 4741 ieee80211_free_txskb(&local->hw, skb); 4742 continue; 4743 } 4744 4745 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4746 flags); 4747 4748 txok = ieee80211_tx_pending_skb(local, skb); 4749 spin_lock_irqsave(&local->queue_stop_reason_lock, 4750 flags); 4751 if (!txok) 4752 break; 4753 } 4754 4755 if (skb_queue_empty(&local->pending[i])) 4756 ieee80211_propagate_queue_wake(local, i); 4757 } 4758 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4759 4760 rcu_read_unlock(); 4761 } 4762 4763 /* functions for drivers to get certain frames */ 4764 4765 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4766 struct ieee80211_link_data *link, 4767 struct ps_data *ps, struct sk_buff *skb, 4768 bool is_template) 4769 { 4770 u8 *pos, *tim; 4771 int aid0 = 0; 4772 int i, have_bits = 0, n1, n2; 4773 struct ieee80211_bss_conf *link_conf = link->conf; 4774 4775 /* Generate bitmap for TIM only if there are any STAs in power save 4776 * mode. */ 4777 if (atomic_read(&ps->num_sta_ps) > 0) 4778 /* in the hope that this is faster than 4779 * checking byte-for-byte */ 4780 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4781 IEEE80211_MAX_AID+1); 4782 if (!is_template) { 4783 if (ps->dtim_count == 0) 4784 ps->dtim_count = link_conf->dtim_period - 1; 4785 else 4786 ps->dtim_count--; 4787 } 4788 4789 tim = pos = skb_put(skb, 6); 4790 *pos++ = WLAN_EID_TIM; 4791 *pos++ = 4; 4792 *pos++ = ps->dtim_count; 4793 *pos++ = link_conf->dtim_period; 4794 4795 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4796 aid0 = 1; 4797 4798 ps->dtim_bc_mc = aid0 == 1; 4799 4800 if (have_bits) { 4801 /* Find largest even number N1 so that bits numbered 1 through 4802 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4803 * (N2 + 1) x 8 through 2007 are 0. */ 4804 n1 = 0; 4805 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4806 if (ps->tim[i]) { 4807 n1 = i & 0xfe; 4808 break; 4809 } 4810 } 4811 n2 = n1; 4812 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4813 if (ps->tim[i]) { 4814 n2 = i; 4815 break; 4816 } 4817 } 4818 4819 /* Bitmap control */ 4820 *pos++ = n1 | aid0; 4821 /* Part Virt Bitmap */ 4822 skb_put(skb, n2 - n1); 4823 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4824 4825 tim[1] = n2 - n1 + 4; 4826 } else { 4827 *pos++ = aid0; /* Bitmap control */ 4828 *pos++ = 0; /* Part Virt Bitmap */ 4829 } 4830 } 4831 4832 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4833 struct ieee80211_link_data *link, 4834 struct ps_data *ps, struct sk_buff *skb, 4835 bool is_template) 4836 { 4837 struct ieee80211_local *local = sdata->local; 4838 4839 /* 4840 * Not very nice, but we want to allow the driver to call 4841 * ieee80211_beacon_get() as a response to the set_tim() 4842 * callback. That, however, is already invoked under the 4843 * sta_lock to guarantee consistent and race-free update 4844 * of the tim bitmap in mac80211 and the driver. 4845 */ 4846 if (local->tim_in_locked_section) { 4847 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4848 } else { 4849 spin_lock_bh(&local->tim_lock); 4850 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4851 spin_unlock_bh(&local->tim_lock); 4852 } 4853 4854 return 0; 4855 } 4856 4857 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4858 struct beacon_data *beacon, 4859 struct ieee80211_link_data *link) 4860 { 4861 u8 *beacon_data, count, max_count = 1; 4862 struct probe_resp *resp; 4863 size_t beacon_data_len; 4864 u16 *bcn_offsets; 4865 int i; 4866 4867 switch (sdata->vif.type) { 4868 case NL80211_IFTYPE_AP: 4869 beacon_data = beacon->tail; 4870 beacon_data_len = beacon->tail_len; 4871 break; 4872 case NL80211_IFTYPE_ADHOC: 4873 beacon_data = beacon->head; 4874 beacon_data_len = beacon->head_len; 4875 break; 4876 case NL80211_IFTYPE_MESH_POINT: 4877 beacon_data = beacon->head; 4878 beacon_data_len = beacon->head_len; 4879 break; 4880 default: 4881 return; 4882 } 4883 4884 resp = rcu_dereference(link->u.ap.probe_resp); 4885 4886 bcn_offsets = beacon->cntdwn_counter_offsets; 4887 count = beacon->cntdwn_current_counter; 4888 if (link->conf->csa_active) 4889 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4890 4891 for (i = 0; i < max_count; ++i) { 4892 if (bcn_offsets[i]) { 4893 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 4894 return; 4895 beacon_data[bcn_offsets[i]] = count; 4896 } 4897 4898 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4899 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4900 4901 resp->data[resp_offsets[i]] = count; 4902 } 4903 } 4904 } 4905 4906 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4907 { 4908 beacon->cntdwn_current_counter--; 4909 4910 /* the counter should never reach 0 */ 4911 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4912 4913 return beacon->cntdwn_current_counter; 4914 } 4915 4916 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4917 { 4918 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4919 struct beacon_data *beacon = NULL; 4920 u8 count = 0; 4921 4922 rcu_read_lock(); 4923 4924 if (sdata->vif.type == NL80211_IFTYPE_AP) 4925 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4926 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4927 beacon = rcu_dereference(sdata->u.ibss.presp); 4928 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4929 beacon = rcu_dereference(sdata->u.mesh.beacon); 4930 4931 if (!beacon) 4932 goto unlock; 4933 4934 count = __ieee80211_beacon_update_cntdwn(beacon); 4935 4936 unlock: 4937 rcu_read_unlock(); 4938 return count; 4939 } 4940 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4941 4942 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4943 { 4944 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4945 struct beacon_data *beacon = NULL; 4946 4947 rcu_read_lock(); 4948 4949 if (sdata->vif.type == NL80211_IFTYPE_AP) 4950 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4951 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4952 beacon = rcu_dereference(sdata->u.ibss.presp); 4953 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4954 beacon = rcu_dereference(sdata->u.mesh.beacon); 4955 4956 if (!beacon) 4957 goto unlock; 4958 4959 if (counter < beacon->cntdwn_current_counter) 4960 beacon->cntdwn_current_counter = counter; 4961 4962 unlock: 4963 rcu_read_unlock(); 4964 } 4965 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4966 4967 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4968 { 4969 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4970 struct beacon_data *beacon = NULL; 4971 u8 *beacon_data; 4972 size_t beacon_data_len; 4973 int ret = false; 4974 4975 if (!ieee80211_sdata_running(sdata)) 4976 return false; 4977 4978 rcu_read_lock(); 4979 if (vif->type == NL80211_IFTYPE_AP) { 4980 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4981 if (WARN_ON(!beacon || !beacon->tail)) 4982 goto out; 4983 beacon_data = beacon->tail; 4984 beacon_data_len = beacon->tail_len; 4985 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4986 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4987 4988 beacon = rcu_dereference(ifibss->presp); 4989 if (!beacon) 4990 goto out; 4991 4992 beacon_data = beacon->head; 4993 beacon_data_len = beacon->head_len; 4994 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4995 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4996 4997 beacon = rcu_dereference(ifmsh->beacon); 4998 if (!beacon) 4999 goto out; 5000 5001 beacon_data = beacon->head; 5002 beacon_data_len = beacon->head_len; 5003 } else { 5004 WARN_ON(1); 5005 goto out; 5006 } 5007 5008 if (!beacon->cntdwn_counter_offsets[0]) 5009 goto out; 5010 5011 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5012 goto out; 5013 5014 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5015 ret = true; 5016 5017 out: 5018 rcu_read_unlock(); 5019 5020 return ret; 5021 } 5022 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5023 5024 static int ieee80211_beacon_protect(struct sk_buff *skb, 5025 struct ieee80211_local *local, 5026 struct ieee80211_sub_if_data *sdata, 5027 struct ieee80211_link_data *link) 5028 { 5029 ieee80211_tx_result res; 5030 struct ieee80211_tx_data tx; 5031 struct sk_buff *check_skb; 5032 5033 memset(&tx, 0, sizeof(tx)); 5034 tx.key = rcu_dereference(link->default_beacon_key); 5035 if (!tx.key) 5036 return 0; 5037 tx.local = local; 5038 tx.sdata = sdata; 5039 __skb_queue_head_init(&tx.skbs); 5040 __skb_queue_tail(&tx.skbs, skb); 5041 res = ieee80211_tx_h_encrypt(&tx); 5042 check_skb = __skb_dequeue(&tx.skbs); 5043 /* we may crash after this, but it'd be a bug in crypto */ 5044 WARN_ON(check_skb != skb); 5045 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5046 return -EINVAL; 5047 5048 return 0; 5049 } 5050 5051 static void 5052 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5053 struct ieee80211_vif *vif, 5054 struct ieee80211_link_data *link, 5055 struct ieee80211_mutable_offsets *offs, 5056 struct beacon_data *beacon, 5057 struct sk_buff *skb, 5058 struct ieee80211_chanctx_conf *chanctx_conf, 5059 u16 csa_off_base) 5060 { 5061 struct ieee80211_local *local = hw_to_local(hw); 5062 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5063 struct ieee80211_tx_info *info; 5064 enum nl80211_band band; 5065 struct ieee80211_tx_rate_control txrc; 5066 5067 /* CSA offsets */ 5068 if (offs && beacon) { 5069 u16 i; 5070 5071 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5072 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5073 5074 if (!csa_off) 5075 continue; 5076 5077 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5078 } 5079 } 5080 5081 band = chanctx_conf->def.chan->band; 5082 info = IEEE80211_SKB_CB(skb); 5083 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5084 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5085 info->band = band; 5086 5087 memset(&txrc, 0, sizeof(txrc)); 5088 txrc.hw = hw; 5089 txrc.sband = local->hw.wiphy->bands[band]; 5090 txrc.bss_conf = link->conf; 5091 txrc.skb = skb; 5092 txrc.reported_rate.idx = -1; 5093 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5094 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5095 else 5096 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5097 txrc.bss = true; 5098 rate_control_get_rate(sdata, NULL, &txrc); 5099 5100 info->control.vif = vif; 5101 info->control.flags |= u32_encode_bits(link->link_id, 5102 IEEE80211_TX_CTRL_MLO_LINK); 5103 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5104 IEEE80211_TX_CTL_ASSIGN_SEQ | 5105 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5106 } 5107 5108 static void 5109 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon) 5110 { 5111 int i; 5112 5113 if (!beacon->mbssid_ies) 5114 return; 5115 5116 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5117 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5118 beacon->mbssid_ies->elem[i].len); 5119 } 5120 5121 static struct sk_buff * 5122 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5123 struct ieee80211_vif *vif, 5124 struct ieee80211_link_data *link, 5125 struct ieee80211_mutable_offsets *offs, 5126 bool is_template, 5127 struct beacon_data *beacon, 5128 struct ieee80211_chanctx_conf *chanctx_conf) 5129 { 5130 struct ieee80211_local *local = hw_to_local(hw); 5131 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5132 struct ieee80211_if_ap *ap = &sdata->u.ap; 5133 struct sk_buff *skb = NULL; 5134 u16 csa_off_base = 0; 5135 int mbssid_len; 5136 5137 if (beacon->cntdwn_counter_offsets[0]) { 5138 if (!is_template) 5139 ieee80211_beacon_update_cntdwn(vif); 5140 5141 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5142 } 5143 5144 /* headroom, head length, 5145 * tail length, maximum TIM length and multiple BSSID length 5146 */ 5147 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies); 5148 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5149 beacon->tail_len + 256 + 5150 local->hw.extra_beacon_tailroom + mbssid_len); 5151 if (!skb) 5152 return NULL; 5153 5154 skb_reserve(skb, local->tx_headroom); 5155 skb_put_data(skb, beacon->head, beacon->head_len); 5156 5157 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5158 5159 if (offs) { 5160 offs->tim_offset = beacon->head_len; 5161 offs->tim_length = skb->len - beacon->head_len; 5162 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5163 5164 if (mbssid_len) { 5165 ieee80211_beacon_add_mbssid(skb, beacon); 5166 offs->mbssid_off = skb->len - mbssid_len; 5167 } 5168 5169 /* for AP the csa offsets are from tail */ 5170 csa_off_base = skb->len; 5171 } 5172 5173 if (beacon->tail) 5174 skb_put_data(skb, beacon->tail, beacon->tail_len); 5175 5176 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5177 return NULL; 5178 5179 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5180 chanctx_conf, csa_off_base); 5181 return skb; 5182 } 5183 5184 static struct sk_buff * 5185 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5186 struct ieee80211_vif *vif, 5187 struct ieee80211_mutable_offsets *offs, 5188 bool is_template, 5189 unsigned int link_id) 5190 { 5191 struct ieee80211_local *local = hw_to_local(hw); 5192 struct beacon_data *beacon = NULL; 5193 struct sk_buff *skb = NULL; 5194 struct ieee80211_sub_if_data *sdata = NULL; 5195 struct ieee80211_chanctx_conf *chanctx_conf; 5196 struct ieee80211_link_data *link; 5197 5198 rcu_read_lock(); 5199 5200 sdata = vif_to_sdata(vif); 5201 link = rcu_dereference(sdata->link[link_id]); 5202 if (!link) 5203 goto out; 5204 chanctx_conf = 5205 rcu_dereference(link->conf->chanctx_conf); 5206 5207 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5208 goto out; 5209 5210 if (offs) 5211 memset(offs, 0, sizeof(*offs)); 5212 5213 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5214 beacon = rcu_dereference(link->u.ap.beacon); 5215 if (!beacon) 5216 goto out; 5217 5218 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template, 5219 beacon, chanctx_conf); 5220 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5221 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5222 struct ieee80211_hdr *hdr; 5223 5224 beacon = rcu_dereference(ifibss->presp); 5225 if (!beacon) 5226 goto out; 5227 5228 if (beacon->cntdwn_counter_offsets[0]) { 5229 if (!is_template) 5230 __ieee80211_beacon_update_cntdwn(beacon); 5231 5232 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5233 } 5234 5235 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5236 local->hw.extra_beacon_tailroom); 5237 if (!skb) 5238 goto out; 5239 skb_reserve(skb, local->tx_headroom); 5240 skb_put_data(skb, beacon->head, beacon->head_len); 5241 5242 hdr = (struct ieee80211_hdr *) skb->data; 5243 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5244 IEEE80211_STYPE_BEACON); 5245 5246 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5247 chanctx_conf, 0); 5248 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5249 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5250 5251 beacon = rcu_dereference(ifmsh->beacon); 5252 if (!beacon) 5253 goto out; 5254 5255 if (beacon->cntdwn_counter_offsets[0]) { 5256 if (!is_template) 5257 /* TODO: For mesh csa_counter is in TU, so 5258 * decrementing it by one isn't correct, but 5259 * for now we leave it consistent with overall 5260 * mac80211's behavior. 5261 */ 5262 __ieee80211_beacon_update_cntdwn(beacon); 5263 5264 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5265 } 5266 5267 if (ifmsh->sync_ops) 5268 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5269 5270 skb = dev_alloc_skb(local->tx_headroom + 5271 beacon->head_len + 5272 256 + /* TIM IE */ 5273 beacon->tail_len + 5274 local->hw.extra_beacon_tailroom); 5275 if (!skb) 5276 goto out; 5277 skb_reserve(skb, local->tx_headroom); 5278 skb_put_data(skb, beacon->head, beacon->head_len); 5279 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5280 is_template); 5281 5282 if (offs) { 5283 offs->tim_offset = beacon->head_len; 5284 offs->tim_length = skb->len - beacon->head_len; 5285 } 5286 5287 skb_put_data(skb, beacon->tail, beacon->tail_len); 5288 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5289 chanctx_conf, 0); 5290 } else { 5291 WARN_ON(1); 5292 goto out; 5293 } 5294 5295 out: 5296 rcu_read_unlock(); 5297 return skb; 5298 5299 } 5300 5301 struct sk_buff * 5302 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5303 struct ieee80211_vif *vif, 5304 struct ieee80211_mutable_offsets *offs, 5305 unsigned int link_id) 5306 { 5307 return __ieee80211_beacon_get(hw, vif, offs, true, link_id); 5308 } 5309 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5310 5311 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5312 struct ieee80211_vif *vif, 5313 u16 *tim_offset, u16 *tim_length, 5314 unsigned int link_id) 5315 { 5316 struct ieee80211_mutable_offsets offs = {}; 5317 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5318 link_id); 5319 struct sk_buff *copy; 5320 int shift; 5321 5322 if (!bcn) 5323 return bcn; 5324 5325 if (tim_offset) 5326 *tim_offset = offs.tim_offset; 5327 5328 if (tim_length) 5329 *tim_length = offs.tim_length; 5330 5331 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5332 !hw_to_local(hw)->monitors) 5333 return bcn; 5334 5335 /* send a copy to monitor interfaces */ 5336 copy = skb_copy(bcn, GFP_ATOMIC); 5337 if (!copy) 5338 return bcn; 5339 5340 shift = ieee80211_vif_get_shift(vif); 5341 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5342 5343 return bcn; 5344 } 5345 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5346 5347 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5348 struct ieee80211_vif *vif) 5349 { 5350 struct sk_buff *skb = NULL; 5351 struct probe_resp *presp = NULL; 5352 struct ieee80211_hdr *hdr; 5353 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5354 5355 if (sdata->vif.type != NL80211_IFTYPE_AP) 5356 return NULL; 5357 5358 rcu_read_lock(); 5359 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5360 if (!presp) 5361 goto out; 5362 5363 skb = dev_alloc_skb(presp->len); 5364 if (!skb) 5365 goto out; 5366 5367 skb_put_data(skb, presp->data, presp->len); 5368 5369 hdr = (struct ieee80211_hdr *) skb->data; 5370 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5371 5372 out: 5373 rcu_read_unlock(); 5374 return skb; 5375 } 5376 EXPORT_SYMBOL(ieee80211_proberesp_get); 5377 5378 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5379 struct ieee80211_vif *vif) 5380 { 5381 struct sk_buff *skb = NULL; 5382 struct fils_discovery_data *tmpl = NULL; 5383 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5384 5385 if (sdata->vif.type != NL80211_IFTYPE_AP) 5386 return NULL; 5387 5388 rcu_read_lock(); 5389 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5390 if (!tmpl) { 5391 rcu_read_unlock(); 5392 return NULL; 5393 } 5394 5395 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5396 if (skb) { 5397 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5398 skb_put_data(skb, tmpl->data, tmpl->len); 5399 } 5400 5401 rcu_read_unlock(); 5402 return skb; 5403 } 5404 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5405 5406 struct sk_buff * 5407 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5408 struct ieee80211_vif *vif) 5409 { 5410 struct sk_buff *skb = NULL; 5411 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5412 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5413 5414 if (sdata->vif.type != NL80211_IFTYPE_AP) 5415 return NULL; 5416 5417 rcu_read_lock(); 5418 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5419 if (!tmpl) { 5420 rcu_read_unlock(); 5421 return NULL; 5422 } 5423 5424 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5425 if (skb) { 5426 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5427 skb_put_data(skb, tmpl->data, tmpl->len); 5428 } 5429 5430 rcu_read_unlock(); 5431 return skb; 5432 } 5433 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5434 5435 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5436 struct ieee80211_vif *vif) 5437 { 5438 struct ieee80211_sub_if_data *sdata; 5439 struct ieee80211_pspoll *pspoll; 5440 struct ieee80211_local *local; 5441 struct sk_buff *skb; 5442 5443 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5444 return NULL; 5445 5446 sdata = vif_to_sdata(vif); 5447 local = sdata->local; 5448 5449 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5450 if (!skb) 5451 return NULL; 5452 5453 skb_reserve(skb, local->hw.extra_tx_headroom); 5454 5455 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5456 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5457 IEEE80211_STYPE_PSPOLL); 5458 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5459 5460 /* aid in PS-Poll has its two MSBs each set to 1 */ 5461 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5462 5463 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5464 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5465 5466 return skb; 5467 } 5468 EXPORT_SYMBOL(ieee80211_pspoll_get); 5469 5470 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5471 struct ieee80211_vif *vif, 5472 bool qos_ok) 5473 { 5474 struct ieee80211_hdr_3addr *nullfunc; 5475 struct ieee80211_sub_if_data *sdata; 5476 struct ieee80211_local *local; 5477 struct sk_buff *skb; 5478 bool qos = false; 5479 5480 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5481 return NULL; 5482 5483 sdata = vif_to_sdata(vif); 5484 local = sdata->local; 5485 5486 if (qos_ok) { 5487 struct sta_info *sta; 5488 5489 rcu_read_lock(); 5490 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 5491 qos = sta && sta->sta.wme; 5492 rcu_read_unlock(); 5493 } 5494 5495 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5496 sizeof(*nullfunc) + 2); 5497 if (!skb) 5498 return NULL; 5499 5500 skb_reserve(skb, local->hw.extra_tx_headroom); 5501 5502 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5503 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5504 IEEE80211_STYPE_NULLFUNC | 5505 IEEE80211_FCTL_TODS); 5506 if (qos) { 5507 __le16 qoshdr = cpu_to_le16(7); 5508 5509 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5510 IEEE80211_STYPE_NULLFUNC) != 5511 IEEE80211_STYPE_QOS_NULLFUNC); 5512 nullfunc->frame_control |= 5513 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5514 skb->priority = 7; 5515 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5516 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5517 } 5518 5519 memcpy(nullfunc->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5520 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5521 memcpy(nullfunc->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5522 5523 return skb; 5524 } 5525 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5526 5527 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5528 const u8 *src_addr, 5529 const u8 *ssid, size_t ssid_len, 5530 size_t tailroom) 5531 { 5532 struct ieee80211_local *local = hw_to_local(hw); 5533 struct ieee80211_hdr_3addr *hdr; 5534 struct sk_buff *skb; 5535 size_t ie_ssid_len; 5536 u8 *pos; 5537 5538 ie_ssid_len = 2 + ssid_len; 5539 5540 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5541 ie_ssid_len + tailroom); 5542 if (!skb) 5543 return NULL; 5544 5545 skb_reserve(skb, local->hw.extra_tx_headroom); 5546 5547 hdr = skb_put_zero(skb, sizeof(*hdr)); 5548 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5549 IEEE80211_STYPE_PROBE_REQ); 5550 eth_broadcast_addr(hdr->addr1); 5551 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5552 eth_broadcast_addr(hdr->addr3); 5553 5554 pos = skb_put(skb, ie_ssid_len); 5555 *pos++ = WLAN_EID_SSID; 5556 *pos++ = ssid_len; 5557 if (ssid_len) 5558 memcpy(pos, ssid, ssid_len); 5559 pos += ssid_len; 5560 5561 return skb; 5562 } 5563 EXPORT_SYMBOL(ieee80211_probereq_get); 5564 5565 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5566 const void *frame, size_t frame_len, 5567 const struct ieee80211_tx_info *frame_txctl, 5568 struct ieee80211_rts *rts) 5569 { 5570 const struct ieee80211_hdr *hdr = frame; 5571 5572 rts->frame_control = 5573 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5574 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5575 frame_txctl); 5576 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5577 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5578 } 5579 EXPORT_SYMBOL(ieee80211_rts_get); 5580 5581 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5582 const void *frame, size_t frame_len, 5583 const struct ieee80211_tx_info *frame_txctl, 5584 struct ieee80211_cts *cts) 5585 { 5586 const struct ieee80211_hdr *hdr = frame; 5587 5588 cts->frame_control = 5589 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5590 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5591 frame_len, frame_txctl); 5592 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5593 } 5594 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5595 5596 struct sk_buff * 5597 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5598 struct ieee80211_vif *vif) 5599 { 5600 struct ieee80211_local *local = hw_to_local(hw); 5601 struct sk_buff *skb = NULL; 5602 struct ieee80211_tx_data tx; 5603 struct ieee80211_sub_if_data *sdata; 5604 struct ps_data *ps; 5605 struct ieee80211_tx_info *info; 5606 struct ieee80211_chanctx_conf *chanctx_conf; 5607 5608 sdata = vif_to_sdata(vif); 5609 5610 rcu_read_lock(); 5611 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5612 5613 if (!chanctx_conf) 5614 goto out; 5615 5616 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5617 struct beacon_data *beacon = 5618 rcu_dereference(sdata->deflink.u.ap.beacon); 5619 5620 if (!beacon || !beacon->head) 5621 goto out; 5622 5623 ps = &sdata->u.ap.ps; 5624 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5625 ps = &sdata->u.mesh.ps; 5626 } else { 5627 goto out; 5628 } 5629 5630 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5631 goto out; /* send buffered bc/mc only after DTIM beacon */ 5632 5633 while (1) { 5634 skb = skb_dequeue(&ps->bc_buf); 5635 if (!skb) 5636 goto out; 5637 local->total_ps_buffered--; 5638 5639 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5640 struct ieee80211_hdr *hdr = 5641 (struct ieee80211_hdr *) skb->data; 5642 /* more buffered multicast/broadcast frames ==> set 5643 * MoreData flag in IEEE 802.11 header to inform PS 5644 * STAs */ 5645 hdr->frame_control |= 5646 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5647 } 5648 5649 if (sdata->vif.type == NL80211_IFTYPE_AP) 5650 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5651 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5652 break; 5653 ieee80211_free_txskb(hw, skb); 5654 } 5655 5656 info = IEEE80211_SKB_CB(skb); 5657 5658 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5659 info->band = chanctx_conf->def.chan->band; 5660 5661 if (invoke_tx_handlers(&tx)) 5662 skb = NULL; 5663 out: 5664 rcu_read_unlock(); 5665 5666 return skb; 5667 } 5668 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5669 5670 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5671 { 5672 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5673 struct ieee80211_sub_if_data *sdata = sta->sdata; 5674 struct ieee80211_local *local = sdata->local; 5675 int ret; 5676 u32 queues; 5677 5678 lockdep_assert_held(&local->sta_mtx); 5679 5680 /* only some cases are supported right now */ 5681 switch (sdata->vif.type) { 5682 case NL80211_IFTYPE_STATION: 5683 case NL80211_IFTYPE_AP: 5684 case NL80211_IFTYPE_AP_VLAN: 5685 break; 5686 default: 5687 WARN_ON(1); 5688 return -EINVAL; 5689 } 5690 5691 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5692 return -EINVAL; 5693 5694 if (sta->reserved_tid == tid) { 5695 ret = 0; 5696 goto out; 5697 } 5698 5699 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5700 sdata_err(sdata, "TID reservation already active\n"); 5701 ret = -EALREADY; 5702 goto out; 5703 } 5704 5705 ieee80211_stop_vif_queues(sdata->local, sdata, 5706 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5707 5708 synchronize_net(); 5709 5710 /* Tear down BA sessions so we stop aggregating on this TID */ 5711 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5712 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5713 __ieee80211_stop_tx_ba_session(sta, tid, 5714 AGG_STOP_LOCAL_REQUEST); 5715 } 5716 5717 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5718 __ieee80211_flush_queues(local, sdata, queues, false); 5719 5720 sta->reserved_tid = tid; 5721 5722 ieee80211_wake_vif_queues(local, sdata, 5723 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5724 5725 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5726 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5727 5728 ret = 0; 5729 out: 5730 return ret; 5731 } 5732 EXPORT_SYMBOL(ieee80211_reserve_tid); 5733 5734 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5735 { 5736 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5737 struct ieee80211_sub_if_data *sdata = sta->sdata; 5738 5739 lockdep_assert_held(&sdata->local->sta_mtx); 5740 5741 /* only some cases are supported right now */ 5742 switch (sdata->vif.type) { 5743 case NL80211_IFTYPE_STATION: 5744 case NL80211_IFTYPE_AP: 5745 case NL80211_IFTYPE_AP_VLAN: 5746 break; 5747 default: 5748 WARN_ON(1); 5749 return; 5750 } 5751 5752 if (tid != sta->reserved_tid) { 5753 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5754 return; 5755 } 5756 5757 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5758 } 5759 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5760 5761 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5762 struct sk_buff *skb, int tid, int link_id, 5763 enum nl80211_band band) 5764 { 5765 const struct ieee80211_hdr *hdr = (void *)skb->data; 5766 int ac = ieee80211_ac_from_tid(tid); 5767 unsigned int link; 5768 5769 skb_reset_mac_header(skb); 5770 skb_set_queue_mapping(skb, ac); 5771 skb->priority = tid; 5772 5773 skb->dev = sdata->dev; 5774 5775 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 5776 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 5777 IEEE80211_LINK_UNSPECIFIED)); 5778 5779 if (!sdata->vif.valid_links) { 5780 link = 0; 5781 } else if (link_id >= 0) { 5782 link = link_id; 5783 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 5784 /* address from the MLD */ 5785 link = IEEE80211_LINK_UNSPECIFIED; 5786 } else { 5787 /* otherwise must be addressed from a link */ 5788 rcu_read_lock(); 5789 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 5790 struct ieee80211_bss_conf *link_conf; 5791 5792 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 5793 if (!link_conf) 5794 continue; 5795 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 5796 break; 5797 } 5798 rcu_read_unlock(); 5799 5800 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 5801 link = ffs(sdata->vif.valid_links) - 1; 5802 } 5803 5804 IEEE80211_SKB_CB(skb)->control.flags |= 5805 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 5806 5807 /* 5808 * The other path calling ieee80211_xmit is from the tasklet, 5809 * and while we can handle concurrent transmissions locking 5810 * requirements are that we do not come into tx with bhs on. 5811 */ 5812 local_bh_disable(); 5813 IEEE80211_SKB_CB(skb)->band = band; 5814 ieee80211_xmit(sdata, NULL, skb); 5815 local_bh_enable(); 5816 } 5817 5818 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 5819 struct sk_buff *skb, int tid, int link_id) 5820 { 5821 struct ieee80211_chanctx_conf *chanctx_conf; 5822 enum nl80211_band band; 5823 5824 rcu_read_lock(); 5825 if (!sdata->vif.valid_links) { 5826 WARN_ON(link_id >= 0); 5827 chanctx_conf = 5828 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5829 if (WARN_ON(!chanctx_conf)) { 5830 rcu_read_unlock(); 5831 kfree_skb(skb); 5832 return; 5833 } 5834 band = chanctx_conf->def.chan->band; 5835 } else { 5836 WARN_ON(link_id >= 0 && 5837 !(sdata->vif.valid_links & BIT(link_id))); 5838 /* MLD transmissions must not rely on the band */ 5839 band = 0; 5840 } 5841 5842 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 5843 rcu_read_unlock(); 5844 } 5845 5846 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5847 const u8 *buf, size_t len, 5848 const u8 *dest, __be16 proto, bool unencrypted, 5849 int link_id, u64 *cookie) 5850 { 5851 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5852 struct ieee80211_local *local = sdata->local; 5853 struct sta_info *sta; 5854 struct sk_buff *skb; 5855 struct ethhdr *ehdr; 5856 u32 ctrl_flags = 0; 5857 u32 flags = 0; 5858 int err; 5859 5860 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5861 * or Pre-Authentication 5862 */ 5863 if (proto != sdata->control_port_protocol && 5864 proto != cpu_to_be16(ETH_P_PREAUTH)) 5865 return -EINVAL; 5866 5867 if (proto == sdata->control_port_protocol) 5868 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5869 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5870 5871 if (unencrypted) 5872 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5873 5874 if (cookie) 5875 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5876 5877 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5878 5879 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5880 sizeof(struct ethhdr) + len); 5881 if (!skb) 5882 return -ENOMEM; 5883 5884 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5885 5886 skb_put_data(skb, buf, len); 5887 5888 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5889 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5890 5891 /* we may override the SA for MLO STA later */ 5892 if (link_id < 0) { 5893 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 5894 IEEE80211_TX_CTRL_MLO_LINK); 5895 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5896 } else { 5897 struct ieee80211_bss_conf *link_conf; 5898 5899 ctrl_flags |= u32_encode_bits(link_id, 5900 IEEE80211_TX_CTRL_MLO_LINK); 5901 5902 rcu_read_lock(); 5903 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 5904 if (!link_conf) { 5905 dev_kfree_skb(skb); 5906 rcu_read_unlock(); 5907 return -ENOLINK; 5908 } 5909 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 5910 rcu_read_unlock(); 5911 } 5912 5913 ehdr->h_proto = proto; 5914 5915 skb->dev = dev; 5916 skb->protocol = proto; 5917 skb_reset_network_header(skb); 5918 skb_reset_mac_header(skb); 5919 5920 /* update QoS header to prioritize control port frames if possible, 5921 * priorization also happens for control port frames send over 5922 * AF_PACKET 5923 */ 5924 rcu_read_lock(); 5925 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 5926 if (err) { 5927 dev_kfree_skb(skb); 5928 rcu_read_unlock(); 5929 return err; 5930 } 5931 5932 if (!IS_ERR(sta)) { 5933 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5934 5935 skb_set_queue_mapping(skb, queue); 5936 skb_get_hash(skb); 5937 5938 /* 5939 * for MLO STA, the SA should be the AP MLD address, but 5940 * the link ID has been selected already 5941 */ 5942 if (sta && sta->sta.mlo) 5943 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5944 } 5945 rcu_read_unlock(); 5946 5947 /* mutex lock is only needed for incrementing the cookie counter */ 5948 mutex_lock(&local->mtx); 5949 5950 local_bh_disable(); 5951 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5952 local_bh_enable(); 5953 5954 mutex_unlock(&local->mtx); 5955 5956 return 0; 5957 } 5958 5959 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5960 const u8 *buf, size_t len) 5961 { 5962 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5963 struct ieee80211_local *local = sdata->local; 5964 struct sk_buff *skb; 5965 5966 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5967 30 + /* header size */ 5968 18); /* 11s header size */ 5969 if (!skb) 5970 return -ENOMEM; 5971 5972 skb_reserve(skb, local->hw.extra_tx_headroom); 5973 skb_put_data(skb, buf, len); 5974 5975 skb->dev = dev; 5976 skb->protocol = htons(ETH_P_802_3); 5977 skb_reset_network_header(skb); 5978 skb_reset_mac_header(skb); 5979 5980 local_bh_disable(); 5981 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5982 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5983 NULL); 5984 local_bh_enable(); 5985 5986 return 0; 5987 } 5988