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 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2323 if (unlikely(!ieee80211_sdata_running(sdata))) 2324 goto fail; 2325 2326 memset(info, 0, sizeof(*info)); 2327 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2328 IEEE80211_TX_CTL_INJECTED; 2329 2330 /* Sanity-check the length of the radiotap header */ 2331 if (!ieee80211_validate_radiotap_len(skb)) 2332 goto fail; 2333 2334 /* we now know there is a radiotap header with a length we can use */ 2335 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2336 2337 /* 2338 * fix up the pointers accounting for the radiotap 2339 * header still being in there. We are being given 2340 * a precooked IEEE80211 header so no need for 2341 * normal processing 2342 */ 2343 skb_set_mac_header(skb, len_rthdr); 2344 /* 2345 * these are just fixed to the end of the rt area since we 2346 * don't have any better information and at this point, nobody cares 2347 */ 2348 skb_set_network_header(skb, len_rthdr); 2349 skb_set_transport_header(skb, len_rthdr); 2350 2351 if (skb->len < len_rthdr + 2) 2352 goto fail; 2353 2354 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2355 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2356 2357 if (skb->len < len_rthdr + hdrlen) 2358 goto fail; 2359 2360 /* 2361 * Initialize skb->protocol if the injected frame is a data frame 2362 * carrying a rfc1042 header 2363 */ 2364 if (ieee80211_is_data(hdr->frame_control) && 2365 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2366 u8 *payload = (u8 *)hdr + hdrlen; 2367 2368 if (ether_addr_equal(payload, rfc1042_header)) 2369 skb->protocol = cpu_to_be16((payload[6] << 8) | 2370 payload[7]); 2371 } 2372 2373 rcu_read_lock(); 2374 2375 /* 2376 * We process outgoing injected frames that have a local address 2377 * we handle as though they are non-injected frames. 2378 * This code here isn't entirely correct, the local MAC address 2379 * isn't always enough to find the interface to use; for proper 2380 * VLAN support we have an nl80211-based mechanism. 2381 * 2382 * This is necessary, for example, for old hostapd versions that 2383 * don't use nl80211-based management TX/RX. 2384 */ 2385 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2386 if (!ieee80211_sdata_running(tmp_sdata)) 2387 continue; 2388 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2389 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2390 continue; 2391 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2392 sdata = tmp_sdata; 2393 break; 2394 } 2395 } 2396 2397 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2398 if (!chanctx_conf) { 2399 tmp_sdata = rcu_dereference(local->monitor_sdata); 2400 if (tmp_sdata) 2401 chanctx_conf = 2402 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2403 } 2404 2405 if (chanctx_conf) 2406 chandef = &chanctx_conf->def; 2407 else if (!local->use_chanctx) 2408 chandef = &local->_oper_chandef; 2409 else 2410 goto fail_rcu; 2411 2412 /* 2413 * Frame injection is not allowed if beaconing is not allowed 2414 * or if we need radar detection. Beaconing is usually not allowed when 2415 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2416 * Passive scan is also used in world regulatory domains where 2417 * your country is not known and as such it should be treated as 2418 * NO TX unless the channel is explicitly allowed in which case 2419 * your current regulatory domain would not have the passive scan 2420 * flag. 2421 * 2422 * Since AP mode uses monitor interfaces to inject/TX management 2423 * frames we can make AP mode the exception to this rule once it 2424 * supports radar detection as its implementation can deal with 2425 * radar detection by itself. We can do that later by adding a 2426 * monitor flag interfaces used for AP support. 2427 */ 2428 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2429 sdata->vif.type)) 2430 goto fail_rcu; 2431 2432 info->band = chandef->chan->band; 2433 2434 /* Initialize skb->priority according to frame type and TID class, 2435 * with respect to the sub interface that the frame will actually 2436 * be transmitted on. If the DONT_REORDER flag is set, the original 2437 * skb-priority is preserved to assure frames injected with this 2438 * flag are not reordered relative to each other. 2439 */ 2440 ieee80211_select_queue_80211(sdata, skb, hdr); 2441 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2442 2443 /* 2444 * Process the radiotap header. This will now take into account the 2445 * selected chandef above to accurately set injection rates and 2446 * retransmissions. 2447 */ 2448 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2449 goto fail_rcu; 2450 2451 /* remove the injection radiotap header */ 2452 skb_pull(skb, len_rthdr); 2453 2454 ieee80211_xmit(sdata, NULL, skb); 2455 rcu_read_unlock(); 2456 2457 return NETDEV_TX_OK; 2458 2459 fail_rcu: 2460 rcu_read_unlock(); 2461 fail: 2462 dev_kfree_skb(skb); 2463 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2464 } 2465 2466 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2467 { 2468 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2469 2470 return ethertype == ETH_P_TDLS && 2471 skb->len > 14 && 2472 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2473 } 2474 2475 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2476 struct sk_buff *skb, 2477 struct sta_info **sta_out) 2478 { 2479 struct sta_info *sta; 2480 2481 switch (sdata->vif.type) { 2482 case NL80211_IFTYPE_AP_VLAN: 2483 sta = rcu_dereference(sdata->u.vlan.sta); 2484 if (sta) { 2485 *sta_out = sta; 2486 return 0; 2487 } else if (sdata->wdev.use_4addr) { 2488 return -ENOLINK; 2489 } 2490 fallthrough; 2491 case NL80211_IFTYPE_AP: 2492 case NL80211_IFTYPE_OCB: 2493 case NL80211_IFTYPE_ADHOC: 2494 if (is_multicast_ether_addr(skb->data)) { 2495 *sta_out = ERR_PTR(-ENOENT); 2496 return 0; 2497 } 2498 sta = sta_info_get_bss(sdata, skb->data); 2499 break; 2500 #ifdef CONFIG_MAC80211_MESH 2501 case NL80211_IFTYPE_MESH_POINT: 2502 /* determined much later */ 2503 *sta_out = NULL; 2504 return 0; 2505 #endif 2506 case NL80211_IFTYPE_STATION: 2507 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2508 sta = sta_info_get(sdata, skb->data); 2509 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2510 if (test_sta_flag(sta, 2511 WLAN_STA_TDLS_PEER_AUTH)) { 2512 *sta_out = sta; 2513 return 0; 2514 } 2515 2516 /* 2517 * TDLS link during setup - throw out frames to 2518 * peer. Allow TDLS-setup frames to unauthorized 2519 * peers for the special case of a link teardown 2520 * after a TDLS sta is removed due to being 2521 * unreachable. 2522 */ 2523 if (!ieee80211_is_tdls_setup(skb)) 2524 return -EINVAL; 2525 } 2526 2527 } 2528 2529 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2530 if (!sta) 2531 return -ENOLINK; 2532 break; 2533 default: 2534 return -EINVAL; 2535 } 2536 2537 *sta_out = sta ?: ERR_PTR(-ENOENT); 2538 return 0; 2539 } 2540 2541 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2542 struct sk_buff *skb, 2543 u32 *info_flags, 2544 u64 *cookie) 2545 { 2546 struct sk_buff *ack_skb; 2547 u16 info_id = 0; 2548 2549 if (skb->sk) 2550 ack_skb = skb_clone_sk(skb); 2551 else 2552 ack_skb = skb_clone(skb, GFP_ATOMIC); 2553 2554 if (ack_skb) { 2555 unsigned long flags; 2556 int id; 2557 2558 spin_lock_irqsave(&local->ack_status_lock, flags); 2559 id = idr_alloc(&local->ack_status_frames, ack_skb, 2560 1, 0x2000, GFP_ATOMIC); 2561 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2562 2563 if (id >= 0) { 2564 info_id = id; 2565 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2566 if (cookie) { 2567 *cookie = ieee80211_mgmt_tx_cookie(local); 2568 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2569 } 2570 } else { 2571 kfree_skb(ack_skb); 2572 } 2573 } 2574 2575 return info_id; 2576 } 2577 2578 /** 2579 * ieee80211_build_hdr - build 802.11 header in the given frame 2580 * @sdata: virtual interface to build the header for 2581 * @skb: the skb to build the header in 2582 * @info_flags: skb flags to set 2583 * @sta: the station pointer 2584 * @ctrl_flags: info control flags to set 2585 * @cookie: cookie pointer to fill (if not %NULL) 2586 * 2587 * This function takes the skb with 802.3 header and reformats the header to 2588 * the appropriate IEEE 802.11 header based on which interface the packet is 2589 * being transmitted on. 2590 * 2591 * Note that this function also takes care of the TX status request and 2592 * potential unsharing of the SKB - this needs to be interleaved with the 2593 * header building. 2594 * 2595 * The function requires the read-side RCU lock held 2596 * 2597 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2598 */ 2599 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2600 struct sk_buff *skb, u32 info_flags, 2601 struct sta_info *sta, u32 ctrl_flags, 2602 u64 *cookie) 2603 { 2604 struct ieee80211_local *local = sdata->local; 2605 struct ieee80211_tx_info *info; 2606 int head_need; 2607 u16 ethertype, hdrlen, meshhdrlen = 0; 2608 __le16 fc; 2609 struct ieee80211_hdr hdr; 2610 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2611 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2612 const u8 *encaps_data; 2613 int encaps_len, skip_header_bytes; 2614 bool wme_sta = false, authorized = false; 2615 bool tdls_peer; 2616 bool multicast; 2617 u16 info_id = 0; 2618 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2619 enum nl80211_band band; 2620 int ret; 2621 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2622 2623 if (IS_ERR(sta)) 2624 sta = NULL; 2625 2626 #ifdef CONFIG_MAC80211_DEBUGFS 2627 if (local->force_tx_status) 2628 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2629 #endif 2630 2631 /* convert Ethernet header to proper 802.11 header (based on 2632 * operation mode) */ 2633 ethertype = (skb->data[12] << 8) | skb->data[13]; 2634 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2635 2636 if (!sdata->vif.valid_links) 2637 chanctx_conf = 2638 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2639 2640 switch (sdata->vif.type) { 2641 case NL80211_IFTYPE_AP_VLAN: 2642 if (sdata->wdev.use_4addr) { 2643 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2644 /* RA TA DA SA */ 2645 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2646 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2647 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2648 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2649 hdrlen = 30; 2650 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2651 wme_sta = sta->sta.wme; 2652 } 2653 if (!sdata->vif.valid_links) { 2654 struct ieee80211_sub_if_data *ap_sdata; 2655 2656 /* override chanctx_conf from AP (we don't have one) */ 2657 ap_sdata = container_of(sdata->bss, 2658 struct ieee80211_sub_if_data, 2659 u.ap); 2660 chanctx_conf = 2661 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2662 } 2663 if (sdata->wdev.use_4addr) 2664 break; 2665 fallthrough; 2666 case NL80211_IFTYPE_AP: 2667 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2668 /* DA BSSID SA */ 2669 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2670 2671 if (sdata->vif.valid_links && sta && !sta->sta.mlo) { 2672 struct ieee80211_link_data *link; 2673 2674 link_id = sta->deflink.link_id; 2675 link = rcu_dereference(sdata->link[link_id]); 2676 if (WARN_ON(!link)) { 2677 ret = -ENOLINK; 2678 goto free; 2679 } 2680 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2681 } else if (link_id == IEEE80211_LINK_UNSPECIFIED || 2682 (sta && sta->sta.mlo)) { 2683 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2684 } else { 2685 struct ieee80211_bss_conf *conf; 2686 2687 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2688 if (unlikely(!conf)) { 2689 ret = -ENOLINK; 2690 goto free; 2691 } 2692 2693 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2694 } 2695 2696 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2697 hdrlen = 24; 2698 break; 2699 #ifdef CONFIG_MAC80211_MESH 2700 case NL80211_IFTYPE_MESH_POINT: 2701 if (!is_multicast_ether_addr(skb->data)) { 2702 struct sta_info *next_hop; 2703 bool mpp_lookup = true; 2704 2705 mpath = mesh_path_lookup(sdata, skb->data); 2706 if (mpath) { 2707 mpp_lookup = false; 2708 next_hop = rcu_dereference(mpath->next_hop); 2709 if (!next_hop || 2710 !(mpath->flags & (MESH_PATH_ACTIVE | 2711 MESH_PATH_RESOLVING))) 2712 mpp_lookup = true; 2713 } 2714 2715 if (mpp_lookup) { 2716 mppath = mpp_path_lookup(sdata, skb->data); 2717 if (mppath) 2718 mppath->exp_time = jiffies; 2719 } 2720 2721 if (mppath && mpath) 2722 mesh_path_del(sdata, mpath->dst); 2723 } 2724 2725 /* 2726 * Use address extension if it is a packet from 2727 * another interface or if we know the destination 2728 * is being proxied by a portal (i.e. portal address 2729 * differs from proxied address) 2730 */ 2731 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2732 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2733 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2734 skb->data, skb->data + ETH_ALEN); 2735 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2736 NULL, NULL); 2737 } else { 2738 /* DS -> MBSS (802.11-2012 13.11.3.3). 2739 * For unicast with unknown forwarding information, 2740 * destination might be in the MBSS or if that fails 2741 * forwarded to another mesh gate. In either case 2742 * resolution will be handled in ieee80211_xmit(), so 2743 * leave the original DA. This also works for mcast */ 2744 const u8 *mesh_da = skb->data; 2745 2746 if (mppath) 2747 mesh_da = mppath->mpp; 2748 else if (mpath) 2749 mesh_da = mpath->dst; 2750 2751 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2752 mesh_da, sdata->vif.addr); 2753 if (is_multicast_ether_addr(mesh_da)) 2754 /* DA TA mSA AE:SA */ 2755 meshhdrlen = ieee80211_new_mesh_header( 2756 sdata, &mesh_hdr, 2757 skb->data + ETH_ALEN, NULL); 2758 else 2759 /* RA TA mDA mSA AE:DA SA */ 2760 meshhdrlen = ieee80211_new_mesh_header( 2761 sdata, &mesh_hdr, skb->data, 2762 skb->data + ETH_ALEN); 2763 2764 } 2765 2766 /* For injected frames, fill RA right away as nexthop lookup 2767 * will be skipped. 2768 */ 2769 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2770 is_zero_ether_addr(hdr.addr1)) 2771 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2772 break; 2773 #endif 2774 case NL80211_IFTYPE_STATION: 2775 /* we already did checks when looking up the RA STA */ 2776 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2777 2778 if (tdls_peer) { 2779 /* DA SA BSSID */ 2780 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2781 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2782 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2783 hdrlen = 24; 2784 } else if (sdata->u.mgd.use_4addr && 2785 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2786 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2787 IEEE80211_FCTL_TODS); 2788 /* RA TA DA SA */ 2789 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2790 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2791 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2792 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2793 hdrlen = 30; 2794 } else { 2795 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2796 /* BSSID SA DA */ 2797 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2798 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2799 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2800 hdrlen = 24; 2801 } 2802 break; 2803 case NL80211_IFTYPE_OCB: 2804 /* DA SA BSSID */ 2805 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2806 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2807 eth_broadcast_addr(hdr.addr3); 2808 hdrlen = 24; 2809 break; 2810 case NL80211_IFTYPE_ADHOC: 2811 /* DA SA BSSID */ 2812 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2813 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2814 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2815 hdrlen = 24; 2816 break; 2817 default: 2818 ret = -EINVAL; 2819 goto free; 2820 } 2821 2822 if (!chanctx_conf) { 2823 if (!sdata->vif.valid_links) { 2824 ret = -ENOTCONN; 2825 goto free; 2826 } 2827 /* MLD transmissions must not rely on the band */ 2828 band = 0; 2829 } else { 2830 band = chanctx_conf->def.chan->band; 2831 } 2832 2833 multicast = is_multicast_ether_addr(hdr.addr1); 2834 2835 /* sta is always NULL for mesh */ 2836 if (sta) { 2837 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2838 wme_sta = sta->sta.wme; 2839 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2840 /* For mesh, the use of the QoS header is mandatory */ 2841 wme_sta = true; 2842 } 2843 2844 /* receiver does QoS (which also means we do) use it */ 2845 if (wme_sta) { 2846 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2847 hdrlen += 2; 2848 } 2849 2850 /* 2851 * Drop unicast frames to unauthorised stations unless they are 2852 * EAPOL frames from the local station. 2853 */ 2854 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2855 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2856 !multicast && !authorized && 2857 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2858 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2859 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2860 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2861 sdata->name, hdr.addr1); 2862 #endif 2863 2864 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2865 2866 ret = -EPERM; 2867 goto free; 2868 } 2869 2870 if (unlikely(!multicast && ((skb->sk && 2871 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2872 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2873 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2874 cookie); 2875 2876 /* 2877 * If the skb is shared we need to obtain our own copy. 2878 */ 2879 skb = skb_share_check(skb, GFP_ATOMIC); 2880 if (unlikely(!skb)) { 2881 ret = -ENOMEM; 2882 goto free; 2883 } 2884 2885 hdr.frame_control = fc; 2886 hdr.duration_id = 0; 2887 hdr.seq_ctrl = 0; 2888 2889 skip_header_bytes = ETH_HLEN; 2890 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2891 encaps_data = bridge_tunnel_header; 2892 encaps_len = sizeof(bridge_tunnel_header); 2893 skip_header_bytes -= 2; 2894 } else if (ethertype >= ETH_P_802_3_MIN) { 2895 encaps_data = rfc1042_header; 2896 encaps_len = sizeof(rfc1042_header); 2897 skip_header_bytes -= 2; 2898 } else { 2899 encaps_data = NULL; 2900 encaps_len = 0; 2901 } 2902 2903 skb_pull(skb, skip_header_bytes); 2904 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2905 2906 /* 2907 * So we need to modify the skb header and hence need a copy of 2908 * that. The head_need variable above doesn't, so far, include 2909 * the needed header space that we don't need right away. If we 2910 * can, then we don't reallocate right now but only after the 2911 * frame arrives at the master device (if it does...) 2912 * 2913 * If we cannot, however, then we will reallocate to include all 2914 * the ever needed space. Also, if we need to reallocate it anyway, 2915 * make it big enough for everything we may ever need. 2916 */ 2917 2918 if (head_need > 0 || skb_cloned(skb)) { 2919 head_need += IEEE80211_ENCRYPT_HEADROOM; 2920 head_need += local->tx_headroom; 2921 head_need = max_t(int, 0, head_need); 2922 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2923 ieee80211_free_txskb(&local->hw, skb); 2924 skb = NULL; 2925 return ERR_PTR(-ENOMEM); 2926 } 2927 } 2928 2929 if (encaps_data) 2930 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2931 2932 #ifdef CONFIG_MAC80211_MESH 2933 if (meshhdrlen > 0) 2934 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2935 #endif 2936 2937 if (ieee80211_is_data_qos(fc)) { 2938 __le16 *qos_control; 2939 2940 qos_control = skb_push(skb, 2); 2941 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2942 /* 2943 * Maybe we could actually set some fields here, for now just 2944 * initialise to zero to indicate no special operation. 2945 */ 2946 *qos_control = 0; 2947 } else 2948 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2949 2950 skb_reset_mac_header(skb); 2951 2952 info = IEEE80211_SKB_CB(skb); 2953 memset(info, 0, sizeof(*info)); 2954 2955 info->flags = info_flags; 2956 info->ack_frame_id = info_id; 2957 info->band = band; 2958 2959 if (likely(!cookie)) { 2960 ctrl_flags |= u32_encode_bits(link_id, 2961 IEEE80211_TX_CTRL_MLO_LINK); 2962 } else { 2963 unsigned int pre_conf_link_id; 2964 2965 /* 2966 * ctrl_flags already have been set by 2967 * ieee80211_tx_control_port(), here 2968 * we just sanity check that 2969 */ 2970 2971 pre_conf_link_id = u32_get_bits(ctrl_flags, 2972 IEEE80211_TX_CTRL_MLO_LINK); 2973 2974 if (pre_conf_link_id != link_id && 2975 link_id != IEEE80211_LINK_UNSPECIFIED) { 2976 #ifdef CPTCFG_MAC80211_VERBOSE_DEBUG 2977 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2978 sdata->name, hdr.addr1, 2979 pre_conf_link_id, link_id); 2980 #endif 2981 ret = -EINVAL; 2982 goto free; 2983 } 2984 } 2985 2986 info->control.flags = ctrl_flags; 2987 2988 return skb; 2989 free: 2990 kfree_skb(skb); 2991 return ERR_PTR(ret); 2992 } 2993 2994 /* 2995 * fast-xmit overview 2996 * 2997 * The core idea of this fast-xmit is to remove per-packet checks by checking 2998 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2999 * checks that are needed to get the sta->fast_tx pointer assigned, after which 3000 * much less work can be done per packet. For example, fragmentation must be 3001 * disabled or the fast_tx pointer will not be set. All the conditions are seen 3002 * in the code here. 3003 * 3004 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 3005 * header and other data to aid packet processing in ieee80211_xmit_fast(). 3006 * 3007 * The most difficult part of this is that when any of these assumptions 3008 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 3009 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 3010 * since the per-packet code no longer checks the conditions. This is reflected 3011 * by the calls to these functions throughout the rest of the code, and must be 3012 * maintained if any of the TX path checks change. 3013 */ 3014 3015 void ieee80211_check_fast_xmit(struct sta_info *sta) 3016 { 3017 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 3018 struct ieee80211_local *local = sta->local; 3019 struct ieee80211_sub_if_data *sdata = sta->sdata; 3020 struct ieee80211_hdr *hdr = (void *)build.hdr; 3021 struct ieee80211_chanctx_conf *chanctx_conf; 3022 __le16 fc; 3023 3024 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 3025 return; 3026 3027 /* Locking here protects both the pointer itself, and against concurrent 3028 * invocations winning data access races to, e.g., the key pointer that 3029 * is used. 3030 * Without it, the invocation of this function right after the key 3031 * pointer changes wouldn't be sufficient, as another CPU could access 3032 * the pointer, then stall, and then do the cache update after the CPU 3033 * that invalidated the key. 3034 * With the locking, such scenarios cannot happen as the check for the 3035 * key and the fast-tx assignment are done atomically, so the CPU that 3036 * modifies the key will either wait or other one will see the key 3037 * cleared/changed already. 3038 */ 3039 spin_lock_bh(&sta->lock); 3040 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3041 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3042 sdata->vif.type == NL80211_IFTYPE_STATION) 3043 goto out; 3044 3045 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3046 goto out; 3047 3048 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3049 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3050 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3051 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3052 goto out; 3053 3054 if (sdata->noack_map) 3055 goto out; 3056 3057 /* fast-xmit doesn't handle fragmentation at all */ 3058 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3059 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3060 goto out; 3061 3062 if (!sdata->vif.valid_links) { 3063 rcu_read_lock(); 3064 chanctx_conf = 3065 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3066 if (!chanctx_conf) { 3067 rcu_read_unlock(); 3068 goto out; 3069 } 3070 build.band = chanctx_conf->def.chan->band; 3071 rcu_read_unlock(); 3072 } else { 3073 /* MLD transmissions must not rely on the band */ 3074 build.band = 0; 3075 } 3076 3077 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3078 3079 switch (sdata->vif.type) { 3080 case NL80211_IFTYPE_ADHOC: 3081 /* DA SA BSSID */ 3082 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3083 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3084 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3085 build.hdr_len = 24; 3086 break; 3087 case NL80211_IFTYPE_STATION: 3088 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3089 /* DA SA BSSID */ 3090 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3091 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3092 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3093 build.hdr_len = 24; 3094 break; 3095 } 3096 3097 if (sdata->u.mgd.use_4addr) { 3098 /* non-regular ethertype cannot use the fastpath */ 3099 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3100 IEEE80211_FCTL_TODS); 3101 /* RA TA DA SA */ 3102 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3103 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3104 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3105 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3106 build.hdr_len = 30; 3107 break; 3108 } 3109 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3110 /* BSSID SA DA */ 3111 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3112 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3113 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3114 build.hdr_len = 24; 3115 break; 3116 case NL80211_IFTYPE_AP_VLAN: 3117 if (sdata->wdev.use_4addr) { 3118 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3119 IEEE80211_FCTL_TODS); 3120 /* RA TA DA SA */ 3121 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3122 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3123 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3124 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3125 build.hdr_len = 30; 3126 break; 3127 } 3128 fallthrough; 3129 case NL80211_IFTYPE_AP: 3130 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3131 /* DA BSSID SA */ 3132 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3133 if (sta->sta.mlo || !sdata->vif.valid_links) { 3134 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3135 } else { 3136 unsigned int link_id = sta->deflink.link_id; 3137 struct ieee80211_link_data *link; 3138 3139 rcu_read_lock(); 3140 link = rcu_dereference(sdata->link[link_id]); 3141 if (WARN_ON(!link)) { 3142 rcu_read_unlock(); 3143 goto out; 3144 } 3145 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3146 rcu_read_unlock(); 3147 } 3148 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3149 build.hdr_len = 24; 3150 break; 3151 default: 3152 /* not handled on fast-xmit */ 3153 goto out; 3154 } 3155 3156 if (sta->sta.wme) { 3157 build.hdr_len += 2; 3158 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3159 } 3160 3161 /* We store the key here so there's no point in using rcu_dereference() 3162 * but that's fine because the code that changes the pointers will call 3163 * this function after doing so. For a single CPU that would be enough, 3164 * for multiple see the comment above. 3165 */ 3166 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3167 if (!build.key) 3168 build.key = rcu_access_pointer(sdata->default_unicast_key); 3169 if (build.key) { 3170 bool gen_iv, iv_spc, mmic; 3171 3172 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3173 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3174 mmic = build.key->conf.flags & 3175 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3176 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3177 3178 /* don't handle software crypto */ 3179 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3180 goto out; 3181 3182 /* Key is being removed */ 3183 if (build.key->flags & KEY_FLAG_TAINTED) 3184 goto out; 3185 3186 switch (build.key->conf.cipher) { 3187 case WLAN_CIPHER_SUITE_CCMP: 3188 case WLAN_CIPHER_SUITE_CCMP_256: 3189 if (gen_iv) 3190 build.pn_offs = build.hdr_len; 3191 if (gen_iv || iv_spc) 3192 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3193 break; 3194 case WLAN_CIPHER_SUITE_GCMP: 3195 case WLAN_CIPHER_SUITE_GCMP_256: 3196 if (gen_iv) 3197 build.pn_offs = build.hdr_len; 3198 if (gen_iv || iv_spc) 3199 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3200 break; 3201 case WLAN_CIPHER_SUITE_TKIP: 3202 /* cannot handle MMIC or IV generation in xmit-fast */ 3203 if (mmic || gen_iv) 3204 goto out; 3205 if (iv_spc) 3206 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3207 break; 3208 case WLAN_CIPHER_SUITE_WEP40: 3209 case WLAN_CIPHER_SUITE_WEP104: 3210 /* cannot handle IV generation in fast-xmit */ 3211 if (gen_iv) 3212 goto out; 3213 if (iv_spc) 3214 build.hdr_len += IEEE80211_WEP_IV_LEN; 3215 break; 3216 case WLAN_CIPHER_SUITE_AES_CMAC: 3217 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3218 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3219 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3220 WARN(1, 3221 "management cipher suite 0x%x enabled for data\n", 3222 build.key->conf.cipher); 3223 goto out; 3224 default: 3225 /* we don't know how to generate IVs for this at all */ 3226 if (WARN_ON(gen_iv)) 3227 goto out; 3228 } 3229 3230 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3231 } 3232 3233 hdr->frame_control = fc; 3234 3235 memcpy(build.hdr + build.hdr_len, 3236 rfc1042_header, sizeof(rfc1042_header)); 3237 build.hdr_len += sizeof(rfc1042_header); 3238 3239 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3240 /* if the kmemdup fails, continue w/o fast_tx */ 3241 3242 out: 3243 /* we might have raced against another call to this function */ 3244 old = rcu_dereference_protected(sta->fast_tx, 3245 lockdep_is_held(&sta->lock)); 3246 rcu_assign_pointer(sta->fast_tx, fast_tx); 3247 if (old) 3248 kfree_rcu(old, rcu_head); 3249 spin_unlock_bh(&sta->lock); 3250 } 3251 3252 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3253 { 3254 struct sta_info *sta; 3255 3256 rcu_read_lock(); 3257 list_for_each_entry_rcu(sta, &local->sta_list, list) 3258 ieee80211_check_fast_xmit(sta); 3259 rcu_read_unlock(); 3260 } 3261 3262 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3263 { 3264 struct ieee80211_local *local = sdata->local; 3265 struct sta_info *sta; 3266 3267 rcu_read_lock(); 3268 3269 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3270 if (sdata != sta->sdata && 3271 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3272 continue; 3273 ieee80211_check_fast_xmit(sta); 3274 } 3275 3276 rcu_read_unlock(); 3277 } 3278 3279 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3280 { 3281 struct ieee80211_fast_tx *fast_tx; 3282 3283 spin_lock_bh(&sta->lock); 3284 fast_tx = rcu_dereference_protected(sta->fast_tx, 3285 lockdep_is_held(&sta->lock)); 3286 RCU_INIT_POINTER(sta->fast_tx, NULL); 3287 spin_unlock_bh(&sta->lock); 3288 3289 if (fast_tx) 3290 kfree_rcu(fast_tx, rcu_head); 3291 } 3292 3293 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3294 struct sk_buff *skb, int headroom) 3295 { 3296 if (skb_headroom(skb) < headroom) { 3297 I802_DEBUG_INC(local->tx_expand_skb_head); 3298 3299 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3300 wiphy_debug(local->hw.wiphy, 3301 "failed to reallocate TX buffer\n"); 3302 return false; 3303 } 3304 } 3305 3306 return true; 3307 } 3308 3309 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3310 struct ieee80211_fast_tx *fast_tx, 3311 struct sk_buff *skb) 3312 { 3313 struct ieee80211_local *local = sdata->local; 3314 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3315 struct ieee80211_hdr *hdr; 3316 struct ethhdr *amsdu_hdr; 3317 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3318 int subframe_len = skb->len - hdr_len; 3319 void *data; 3320 u8 *qc, *h_80211_src, *h_80211_dst; 3321 const u8 *bssid; 3322 3323 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3324 return false; 3325 3326 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3327 return true; 3328 3329 if (!ieee80211_amsdu_realloc_pad(local, skb, 3330 sizeof(*amsdu_hdr) + 3331 local->hw.extra_tx_headroom)) 3332 return false; 3333 3334 data = skb_push(skb, sizeof(*amsdu_hdr)); 3335 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3336 hdr = data; 3337 amsdu_hdr = data + hdr_len; 3338 /* h_80211_src/dst is addr* field within hdr */ 3339 h_80211_src = data + fast_tx->sa_offs; 3340 h_80211_dst = data + fast_tx->da_offs; 3341 3342 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3343 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3344 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3345 3346 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3347 * fields needs to be changed to BSSID for A-MSDU frames depending 3348 * on FromDS/ToDS values. 3349 */ 3350 switch (sdata->vif.type) { 3351 case NL80211_IFTYPE_STATION: 3352 bssid = sdata->vif.cfg.ap_addr; 3353 break; 3354 case NL80211_IFTYPE_AP: 3355 case NL80211_IFTYPE_AP_VLAN: 3356 bssid = sdata->vif.addr; 3357 break; 3358 default: 3359 bssid = NULL; 3360 } 3361 3362 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3363 ether_addr_copy(h_80211_src, bssid); 3364 3365 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3366 ether_addr_copy(h_80211_dst, bssid); 3367 3368 qc = ieee80211_get_qos_ctl(hdr); 3369 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3370 3371 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3372 3373 return true; 3374 } 3375 3376 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3377 struct sta_info *sta, 3378 struct ieee80211_fast_tx *fast_tx, 3379 struct sk_buff *skb) 3380 { 3381 struct ieee80211_local *local = sdata->local; 3382 struct fq *fq = &local->fq; 3383 struct fq_tin *tin; 3384 struct fq_flow *flow; 3385 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3386 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3387 struct txq_info *txqi; 3388 struct sk_buff **frag_tail, *head; 3389 int subframe_len = skb->len - ETH_ALEN; 3390 u8 max_subframes = sta->sta.max_amsdu_subframes; 3391 int max_frags = local->hw.max_tx_fragments; 3392 int max_amsdu_len = sta->sta.cur->max_amsdu_len; 3393 int orig_truesize; 3394 u32 flow_idx; 3395 __be16 len; 3396 void *data; 3397 bool ret = false; 3398 unsigned int orig_len; 3399 int n = 2, nfrags, pad = 0; 3400 u16 hdrlen; 3401 3402 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3403 return false; 3404 3405 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3406 return false; 3407 3408 if (skb_is_gso(skb)) 3409 return false; 3410 3411 if (!txq) 3412 return false; 3413 3414 txqi = to_txq_info(txq); 3415 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3416 return false; 3417 3418 if (sta->sta.cur->max_rc_amsdu_len) 3419 max_amsdu_len = min_t(int, max_amsdu_len, 3420 sta->sta.cur->max_rc_amsdu_len); 3421 3422 if (sta->sta.cur->max_tid_amsdu_len[tid]) 3423 max_amsdu_len = min_t(int, max_amsdu_len, 3424 sta->sta.cur->max_tid_amsdu_len[tid]); 3425 3426 flow_idx = fq_flow_idx(fq, skb); 3427 3428 spin_lock_bh(&fq->lock); 3429 3430 /* TODO: Ideally aggregation should be done on dequeue to remain 3431 * responsive to environment changes. 3432 */ 3433 3434 tin = &txqi->tin; 3435 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3436 head = skb_peek_tail(&flow->queue); 3437 if (!head || skb_is_gso(head)) 3438 goto out; 3439 3440 orig_truesize = head->truesize; 3441 orig_len = head->len; 3442 3443 if (skb->len + head->len > max_amsdu_len) 3444 goto out; 3445 3446 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3447 nfrags += 1 + skb_shinfo(head)->nr_frags; 3448 frag_tail = &skb_shinfo(head)->frag_list; 3449 while (*frag_tail) { 3450 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3451 frag_tail = &(*frag_tail)->next; 3452 n++; 3453 } 3454 3455 if (max_subframes && n > max_subframes) 3456 goto out; 3457 3458 if (max_frags && nfrags > max_frags) 3459 goto out; 3460 3461 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3462 goto out; 3463 3464 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3465 goto out; 3466 3467 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3468 * and frag_tail should be &skb_shinfo(head)->frag_list. 3469 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3470 * Reload frag_tail to have it pointing to the correct place. 3471 */ 3472 if (n == 2) 3473 frag_tail = &skb_shinfo(head)->frag_list; 3474 3475 /* 3476 * Pad out the previous subframe to a multiple of 4 by adding the 3477 * padding to the next one, that's being added. Note that head->len 3478 * is the length of the full A-MSDU, but that works since each time 3479 * we add a new subframe we pad out the previous one to a multiple 3480 * of 4 and thus it no longer matters in the next round. 3481 */ 3482 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3483 if ((head->len - hdrlen) & 3) 3484 pad = 4 - ((head->len - hdrlen) & 3); 3485 3486 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3487 2 + pad)) 3488 goto out_recalc; 3489 3490 ret = true; 3491 data = skb_push(skb, ETH_ALEN + 2); 3492 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3493 3494 data += 2 * ETH_ALEN; 3495 len = cpu_to_be16(subframe_len); 3496 memcpy(data, &len, 2); 3497 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3498 3499 memset(skb_push(skb, pad), 0, pad); 3500 3501 head->len += skb->len; 3502 head->data_len += skb->len; 3503 *frag_tail = skb; 3504 3505 out_recalc: 3506 fq->memory_usage += head->truesize - orig_truesize; 3507 if (head->len != orig_len) { 3508 flow->backlog += head->len - orig_len; 3509 tin->backlog_bytes += head->len - orig_len; 3510 } 3511 out: 3512 spin_unlock_bh(&fq->lock); 3513 3514 return ret; 3515 } 3516 3517 /* 3518 * Can be called while the sta lock is held. Anything that can cause packets to 3519 * be generated will cause deadlock! 3520 */ 3521 static ieee80211_tx_result 3522 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3523 struct sta_info *sta, u8 pn_offs, 3524 struct ieee80211_key *key, 3525 struct ieee80211_tx_data *tx) 3526 { 3527 struct sk_buff *skb = tx->skb; 3528 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3529 struct ieee80211_hdr *hdr = (void *)skb->data; 3530 u8 tid = IEEE80211_NUM_TIDS; 3531 3532 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3533 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3534 return TX_DROP; 3535 3536 if (key) 3537 info->control.hw_key = &key->conf; 3538 3539 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3540 3541 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3542 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3543 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3544 } else { 3545 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3546 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3547 sdata->sequence_number += 0x10; 3548 } 3549 3550 if (skb_shinfo(skb)->gso_size) 3551 sta->deflink.tx_stats.msdu[tid] += 3552 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3553 else 3554 sta->deflink.tx_stats.msdu[tid]++; 3555 3556 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3557 3558 /* statistics normally done by ieee80211_tx_h_stats (but that 3559 * has to consider fragmentation, so is more complex) 3560 */ 3561 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3562 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3563 3564 if (pn_offs) { 3565 u64 pn; 3566 u8 *crypto_hdr = skb->data + pn_offs; 3567 3568 switch (key->conf.cipher) { 3569 case WLAN_CIPHER_SUITE_CCMP: 3570 case WLAN_CIPHER_SUITE_CCMP_256: 3571 case WLAN_CIPHER_SUITE_GCMP: 3572 case WLAN_CIPHER_SUITE_GCMP_256: 3573 pn = atomic64_inc_return(&key->conf.tx_pn); 3574 crypto_hdr[0] = pn; 3575 crypto_hdr[1] = pn >> 8; 3576 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3577 crypto_hdr[4] = pn >> 16; 3578 crypto_hdr[5] = pn >> 24; 3579 crypto_hdr[6] = pn >> 32; 3580 crypto_hdr[7] = pn >> 40; 3581 break; 3582 } 3583 } 3584 3585 return TX_CONTINUE; 3586 } 3587 3588 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3589 struct sta_info *sta, 3590 struct ieee80211_fast_tx *fast_tx, 3591 struct sk_buff *skb) 3592 { 3593 struct ieee80211_local *local = sdata->local; 3594 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3595 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3596 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3597 struct ethhdr eth; 3598 struct ieee80211_tx_info *info; 3599 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3600 struct ieee80211_tx_data tx; 3601 ieee80211_tx_result r; 3602 struct tid_ampdu_tx *tid_tx = NULL; 3603 u8 tid = IEEE80211_NUM_TIDS; 3604 3605 /* control port protocol needs a lot of special handling */ 3606 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3607 return false; 3608 3609 /* only RFC 1042 SNAP */ 3610 if (ethertype < ETH_P_802_3_MIN) 3611 return false; 3612 3613 /* don't handle TX status request here either */ 3614 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3615 return false; 3616 3617 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3618 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3619 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3620 if (tid_tx) { 3621 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3622 return false; 3623 if (tid_tx->timeout) 3624 tid_tx->last_tx = jiffies; 3625 } 3626 } 3627 3628 /* after this point (skb is modified) we cannot return false */ 3629 3630 skb = skb_share_check(skb, GFP_ATOMIC); 3631 if (unlikely(!skb)) 3632 return true; 3633 3634 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3635 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3636 return true; 3637 3638 /* will not be crypto-handled beyond what we do here, so use false 3639 * as the may-encrypt argument for the resize to not account for 3640 * more room than we already have in 'extra_head' 3641 */ 3642 if (unlikely(ieee80211_skb_resize(sdata, skb, 3643 max_t(int, extra_head + hw_headroom - 3644 skb_headroom(skb), 0), 3645 ENCRYPT_NO))) { 3646 kfree_skb(skb); 3647 return true; 3648 } 3649 3650 memcpy(ð, skb->data, ETH_HLEN - 2); 3651 hdr = skb_push(skb, extra_head); 3652 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3653 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3654 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3655 3656 info = IEEE80211_SKB_CB(skb); 3657 memset(info, 0, sizeof(*info)); 3658 info->band = fast_tx->band; 3659 info->control.vif = &sdata->vif; 3660 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3661 IEEE80211_TX_CTL_DONTFRAG | 3662 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3663 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3664 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3665 IEEE80211_TX_CTRL_MLO_LINK); 3666 3667 #ifdef CONFIG_MAC80211_DEBUGFS 3668 if (local->force_tx_status) 3669 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3670 #endif 3671 3672 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3673 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3674 *ieee80211_get_qos_ctl(hdr) = tid; 3675 } 3676 3677 __skb_queue_head_init(&tx.skbs); 3678 3679 tx.flags = IEEE80211_TX_UNICAST; 3680 tx.local = local; 3681 tx.sdata = sdata; 3682 tx.sta = sta; 3683 tx.key = fast_tx->key; 3684 3685 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3686 return true; 3687 3688 tx.skb = skb; 3689 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3690 fast_tx->key, &tx); 3691 tx.skb = NULL; 3692 if (r == TX_DROP) { 3693 kfree_skb(skb); 3694 return true; 3695 } 3696 3697 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3698 sdata = container_of(sdata->bss, 3699 struct ieee80211_sub_if_data, u.ap); 3700 3701 __skb_queue_tail(&tx.skbs, skb); 3702 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3703 return true; 3704 } 3705 3706 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3707 struct ieee80211_txq *txq) 3708 { 3709 struct ieee80211_local *local = hw_to_local(hw); 3710 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3711 struct ieee80211_hdr *hdr; 3712 struct sk_buff *skb = NULL; 3713 struct fq *fq = &local->fq; 3714 struct fq_tin *tin = &txqi->tin; 3715 struct ieee80211_tx_info *info; 3716 struct ieee80211_tx_data tx; 3717 ieee80211_tx_result r; 3718 struct ieee80211_vif *vif = txq->vif; 3719 3720 WARN_ON_ONCE(softirq_count() == 0); 3721 3722 if (!ieee80211_txq_airtime_check(hw, txq)) 3723 return NULL; 3724 3725 begin: 3726 spin_lock_bh(&fq->lock); 3727 3728 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3729 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3730 goto out; 3731 3732 if (vif->txqs_stopped[txq->ac]) { 3733 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3734 goto out; 3735 } 3736 3737 /* Make sure fragments stay together. */ 3738 skb = __skb_dequeue(&txqi->frags); 3739 if (unlikely(skb)) { 3740 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3741 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3742 goto out; 3743 IEEE80211_SKB_CB(skb)->control.flags &= 3744 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3745 } else { 3746 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3747 } 3748 3749 if (!skb) 3750 goto out; 3751 3752 spin_unlock_bh(&fq->lock); 3753 3754 hdr = (struct ieee80211_hdr *)skb->data; 3755 info = IEEE80211_SKB_CB(skb); 3756 3757 memset(&tx, 0, sizeof(tx)); 3758 __skb_queue_head_init(&tx.skbs); 3759 tx.local = local; 3760 tx.skb = skb; 3761 tx.sdata = vif_to_sdata(info->control.vif); 3762 3763 if (txq->sta) { 3764 tx.sta = container_of(txq->sta, struct sta_info, sta); 3765 /* 3766 * Drop unicast frames to unauthorised stations unless they are 3767 * injected frames or EAPOL frames from the local station. 3768 */ 3769 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3770 ieee80211_is_data(hdr->frame_control) && 3771 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3772 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3773 !is_multicast_ether_addr(hdr->addr1) && 3774 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3775 (!(info->control.flags & 3776 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3777 !ieee80211_is_our_addr(tx.sdata, hdr->addr2, 3778 NULL)))) { 3779 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3780 ieee80211_free_txskb(&local->hw, skb); 3781 goto begin; 3782 } 3783 } 3784 3785 /* 3786 * The key can be removed while the packet was queued, so need to call 3787 * this here to get the current key. 3788 */ 3789 r = ieee80211_tx_h_select_key(&tx); 3790 if (r != TX_CONTINUE) { 3791 ieee80211_free_txskb(&local->hw, skb); 3792 goto begin; 3793 } 3794 3795 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3796 info->flags |= IEEE80211_TX_CTL_AMPDU; 3797 else 3798 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3799 3800 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3801 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3802 r = ieee80211_tx_h_rate_ctrl(&tx); 3803 if (r != TX_CONTINUE) { 3804 ieee80211_free_txskb(&local->hw, skb); 3805 goto begin; 3806 } 3807 } 3808 goto encap_out; 3809 } 3810 3811 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3812 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3813 sta); 3814 u8 pn_offs = 0; 3815 3816 if (tx.key && 3817 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3818 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3819 3820 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3821 tx.key, &tx); 3822 if (r != TX_CONTINUE) { 3823 ieee80211_free_txskb(&local->hw, skb); 3824 goto begin; 3825 } 3826 } else { 3827 if (invoke_tx_handlers_late(&tx)) 3828 goto begin; 3829 3830 skb = __skb_dequeue(&tx.skbs); 3831 3832 if (!skb_queue_empty(&tx.skbs)) { 3833 spin_lock_bh(&fq->lock); 3834 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3835 spin_unlock_bh(&fq->lock); 3836 } 3837 } 3838 3839 if (skb_has_frag_list(skb) && 3840 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3841 if (skb_linearize(skb)) { 3842 ieee80211_free_txskb(&local->hw, skb); 3843 goto begin; 3844 } 3845 } 3846 3847 switch (tx.sdata->vif.type) { 3848 case NL80211_IFTYPE_MONITOR: 3849 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3850 vif = &tx.sdata->vif; 3851 break; 3852 } 3853 tx.sdata = rcu_dereference(local->monitor_sdata); 3854 if (tx.sdata) { 3855 vif = &tx.sdata->vif; 3856 info->hw_queue = 3857 vif->hw_queue[skb_get_queue_mapping(skb)]; 3858 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3859 ieee80211_free_txskb(&local->hw, skb); 3860 goto begin; 3861 } else { 3862 vif = NULL; 3863 } 3864 break; 3865 case NL80211_IFTYPE_AP_VLAN: 3866 tx.sdata = container_of(tx.sdata->bss, 3867 struct ieee80211_sub_if_data, u.ap); 3868 fallthrough; 3869 default: 3870 vif = &tx.sdata->vif; 3871 break; 3872 } 3873 3874 encap_out: 3875 IEEE80211_SKB_CB(skb)->control.vif = vif; 3876 3877 if (tx.sta && 3878 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3879 bool ampdu = txq->ac != IEEE80211_AC_VO; 3880 u32 airtime; 3881 3882 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3883 skb->len, ampdu); 3884 if (airtime) { 3885 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3886 ieee80211_sta_update_pending_airtime(local, tx.sta, 3887 txq->ac, 3888 airtime, 3889 false); 3890 } 3891 } 3892 3893 return skb; 3894 3895 out: 3896 spin_unlock_bh(&fq->lock); 3897 3898 return skb; 3899 } 3900 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3901 3902 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3903 { 3904 struct airtime_info *air_info = &sta->airtime[ac]; 3905 3906 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3907 } 3908 3909 static void 3910 ieee80211_txq_set_active(struct txq_info *txqi) 3911 { 3912 struct sta_info *sta; 3913 3914 if (!txqi->txq.sta) 3915 return; 3916 3917 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3918 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 3919 } 3920 3921 static bool 3922 ieee80211_txq_keep_active(struct txq_info *txqi) 3923 { 3924 struct sta_info *sta; 3925 u32 diff; 3926 3927 if (!txqi->txq.sta) 3928 return false; 3929 3930 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3931 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 3932 return false; 3933 3934 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 3935 3936 return diff <= AIRTIME_ACTIVE_DURATION; 3937 } 3938 3939 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3940 { 3941 struct ieee80211_local *local = hw_to_local(hw); 3942 struct ieee80211_txq *ret = NULL; 3943 struct txq_info *txqi = NULL, *head = NULL; 3944 bool found_eligible_txq = false; 3945 3946 spin_lock_bh(&local->active_txq_lock[ac]); 3947 3948 if (!local->schedule_round[ac]) 3949 goto out; 3950 3951 begin: 3952 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3953 struct txq_info, 3954 schedule_order); 3955 if (!txqi) 3956 goto out; 3957 3958 if (txqi == head) { 3959 if (!found_eligible_txq) 3960 goto out; 3961 else 3962 found_eligible_txq = false; 3963 } 3964 3965 if (!head) 3966 head = txqi; 3967 3968 if (txqi->txq.sta) { 3969 struct sta_info *sta = container_of(txqi->txq.sta, 3970 struct sta_info, sta); 3971 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3972 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 3973 3974 if (aql_check) 3975 found_eligible_txq = true; 3976 3977 if (deficit < 0) 3978 sta->airtime[txqi->txq.ac].deficit += 3979 sta->airtime_weight; 3980 3981 if (deficit < 0 || !aql_check) { 3982 list_move_tail(&txqi->schedule_order, 3983 &local->active_txqs[txqi->txq.ac]); 3984 goto begin; 3985 } 3986 } 3987 3988 if (txqi->schedule_round == local->schedule_round[ac]) 3989 goto out; 3990 3991 list_del_init(&txqi->schedule_order); 3992 txqi->schedule_round = local->schedule_round[ac]; 3993 ret = &txqi->txq; 3994 3995 out: 3996 spin_unlock_bh(&local->active_txq_lock[ac]); 3997 return ret; 3998 } 3999 EXPORT_SYMBOL(ieee80211_next_txq); 4000 4001 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 4002 struct ieee80211_txq *txq, 4003 bool force) 4004 { 4005 struct ieee80211_local *local = hw_to_local(hw); 4006 struct txq_info *txqi = to_txq_info(txq); 4007 bool has_queue; 4008 4009 spin_lock_bh(&local->active_txq_lock[txq->ac]); 4010 4011 has_queue = force || txq_has_queue(txq); 4012 if (list_empty(&txqi->schedule_order) && 4013 (has_queue || ieee80211_txq_keep_active(txqi))) { 4014 /* If airtime accounting is active, always enqueue STAs at the 4015 * head of the list to ensure that they only get moved to the 4016 * back by the airtime DRR scheduler once they have a negative 4017 * deficit. A station that already has a negative deficit will 4018 * get immediately moved to the back of the list on the next 4019 * call to ieee80211_next_txq(). 4020 */ 4021 if (txqi->txq.sta && local->airtime_flags && has_queue && 4022 wiphy_ext_feature_isset(local->hw.wiphy, 4023 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 4024 list_add(&txqi->schedule_order, 4025 &local->active_txqs[txq->ac]); 4026 else 4027 list_add_tail(&txqi->schedule_order, 4028 &local->active_txqs[txq->ac]); 4029 if (has_queue) 4030 ieee80211_txq_set_active(txqi); 4031 } 4032 4033 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 4034 } 4035 EXPORT_SYMBOL(__ieee80211_schedule_txq); 4036 4037 DEFINE_STATIC_KEY_FALSE(aql_disable); 4038 4039 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4040 struct ieee80211_txq *txq) 4041 { 4042 struct sta_info *sta; 4043 struct ieee80211_local *local = hw_to_local(hw); 4044 4045 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4046 return true; 4047 4048 if (static_branch_unlikely(&aql_disable)) 4049 return true; 4050 4051 if (!txq->sta) 4052 return true; 4053 4054 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4055 return true; 4056 4057 sta = container_of(txq->sta, struct sta_info, sta); 4058 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4059 sta->airtime[txq->ac].aql_limit_low) 4060 return true; 4061 4062 if (atomic_read(&local->aql_total_pending_airtime) < 4063 local->aql_threshold && 4064 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4065 sta->airtime[txq->ac].aql_limit_high) 4066 return true; 4067 4068 return false; 4069 } 4070 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4071 4072 static bool 4073 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4074 { 4075 unsigned int num_txq = 0; 4076 struct txq_info *txq; 4077 u32 aql_limit; 4078 4079 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4080 return true; 4081 4082 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4083 num_txq++; 4084 4085 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4086 local->aql_txq_limit_high[ac]; 4087 4088 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4089 } 4090 4091 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4092 struct ieee80211_txq *txq) 4093 { 4094 struct ieee80211_local *local = hw_to_local(hw); 4095 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4096 struct sta_info *sta; 4097 u8 ac = txq->ac; 4098 4099 spin_lock_bh(&local->active_txq_lock[ac]); 4100 4101 if (!txqi->txq.sta) 4102 goto out; 4103 4104 if (list_empty(&txqi->schedule_order)) 4105 goto out; 4106 4107 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4108 goto out; 4109 4110 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4111 schedule_order) { 4112 if (iter == txqi) 4113 break; 4114 4115 if (!iter->txq.sta) { 4116 list_move_tail(&iter->schedule_order, 4117 &local->active_txqs[ac]); 4118 continue; 4119 } 4120 sta = container_of(iter->txq.sta, struct sta_info, sta); 4121 if (ieee80211_sta_deficit(sta, ac) < 0) 4122 sta->airtime[ac].deficit += sta->airtime_weight; 4123 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4124 } 4125 4126 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4127 if (sta->airtime[ac].deficit >= 0) 4128 goto out; 4129 4130 sta->airtime[ac].deficit += sta->airtime_weight; 4131 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4132 spin_unlock_bh(&local->active_txq_lock[ac]); 4133 4134 return false; 4135 out: 4136 if (!list_empty(&txqi->schedule_order)) 4137 list_del_init(&txqi->schedule_order); 4138 spin_unlock_bh(&local->active_txq_lock[ac]); 4139 4140 return true; 4141 } 4142 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4143 4144 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4145 { 4146 struct ieee80211_local *local = hw_to_local(hw); 4147 4148 spin_lock_bh(&local->active_txq_lock[ac]); 4149 4150 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4151 local->schedule_round[ac]++; 4152 if (!local->schedule_round[ac]) 4153 local->schedule_round[ac]++; 4154 } else { 4155 local->schedule_round[ac] = 0; 4156 } 4157 4158 spin_unlock_bh(&local->active_txq_lock[ac]); 4159 } 4160 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4161 4162 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4163 struct net_device *dev, 4164 u32 info_flags, 4165 u32 ctrl_flags, 4166 u64 *cookie) 4167 { 4168 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4169 struct ieee80211_local *local = sdata->local; 4170 struct sta_info *sta; 4171 struct sk_buff *next; 4172 int len = skb->len; 4173 4174 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4175 kfree_skb(skb); 4176 return; 4177 } 4178 4179 rcu_read_lock(); 4180 4181 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4182 goto out_free; 4183 4184 if (IS_ERR(sta)) 4185 sta = NULL; 4186 4187 if (local->ops->wake_tx_queue) { 4188 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4189 skb_set_queue_mapping(skb, queue); 4190 skb_get_hash(skb); 4191 } 4192 4193 ieee80211_aggr_check(sdata, sta, skb); 4194 4195 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4196 4197 if (sta) { 4198 struct ieee80211_fast_tx *fast_tx; 4199 4200 fast_tx = rcu_dereference(sta->fast_tx); 4201 4202 if (fast_tx && 4203 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4204 goto out; 4205 } 4206 4207 if (skb_is_gso(skb)) { 4208 struct sk_buff *segs; 4209 4210 segs = skb_gso_segment(skb, 0); 4211 if (IS_ERR(segs)) { 4212 goto out_free; 4213 } else if (segs) { 4214 consume_skb(skb); 4215 skb = segs; 4216 } 4217 } else { 4218 /* we cannot process non-linear frames on this path */ 4219 if (skb_linearize(skb)) 4220 goto out_free; 4221 4222 /* the frame could be fragmented, software-encrypted, and other 4223 * things so we cannot really handle checksum offload with it - 4224 * fix it up in software before we handle anything else. 4225 */ 4226 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4227 skb_set_transport_header(skb, 4228 skb_checksum_start_offset(skb)); 4229 if (skb_checksum_help(skb)) 4230 goto out_free; 4231 } 4232 } 4233 4234 skb_list_walk_safe(skb, skb, next) { 4235 skb_mark_not_on_list(skb); 4236 4237 if (skb->protocol == sdata->control_port_protocol) 4238 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4239 4240 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4241 sta, ctrl_flags, cookie); 4242 if (IS_ERR(skb)) { 4243 kfree_skb_list(next); 4244 goto out; 4245 } 4246 4247 dev_sw_netstats_tx_add(dev, 1, skb->len); 4248 4249 ieee80211_xmit(sdata, sta, skb); 4250 } 4251 goto out; 4252 out_free: 4253 kfree_skb(skb); 4254 len = 0; 4255 out: 4256 if (len) 4257 ieee80211_tpt_led_trig_tx(local, len); 4258 rcu_read_unlock(); 4259 } 4260 4261 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4262 { 4263 struct ethhdr *eth; 4264 int err; 4265 4266 err = skb_ensure_writable(skb, ETH_HLEN); 4267 if (unlikely(err)) 4268 return err; 4269 4270 eth = (void *)skb->data; 4271 ether_addr_copy(eth->h_dest, sta->sta.addr); 4272 4273 return 0; 4274 } 4275 4276 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4277 struct net_device *dev) 4278 { 4279 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4280 const struct ethhdr *eth = (void *)skb->data; 4281 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4282 __be16 ethertype; 4283 4284 switch (sdata->vif.type) { 4285 case NL80211_IFTYPE_AP_VLAN: 4286 if (sdata->u.vlan.sta) 4287 return false; 4288 if (sdata->wdev.use_4addr) 4289 return false; 4290 fallthrough; 4291 case NL80211_IFTYPE_AP: 4292 /* check runtime toggle for this bss */ 4293 if (!sdata->bss->multicast_to_unicast) 4294 return false; 4295 break; 4296 default: 4297 return false; 4298 } 4299 4300 /* multicast to unicast conversion only for some payload */ 4301 ethertype = eth->h_proto; 4302 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4303 ethertype = ethvlan->h_vlan_encapsulated_proto; 4304 switch (ethertype) { 4305 case htons(ETH_P_ARP): 4306 case htons(ETH_P_IP): 4307 case htons(ETH_P_IPV6): 4308 break; 4309 default: 4310 return false; 4311 } 4312 4313 return true; 4314 } 4315 4316 static void 4317 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4318 struct sk_buff_head *queue) 4319 { 4320 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4321 struct ieee80211_local *local = sdata->local; 4322 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4323 struct sta_info *sta, *first = NULL; 4324 struct sk_buff *cloned_skb; 4325 4326 rcu_read_lock(); 4327 4328 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4329 if (sdata != sta->sdata) 4330 /* AP-VLAN mismatch */ 4331 continue; 4332 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4333 /* do not send back to source */ 4334 continue; 4335 if (!first) { 4336 first = sta; 4337 continue; 4338 } 4339 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4340 if (!cloned_skb) 4341 goto multicast; 4342 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4343 dev_kfree_skb(cloned_skb); 4344 goto multicast; 4345 } 4346 __skb_queue_tail(queue, cloned_skb); 4347 } 4348 4349 if (likely(first)) { 4350 if (unlikely(ieee80211_change_da(skb, first))) 4351 goto multicast; 4352 __skb_queue_tail(queue, skb); 4353 } else { 4354 /* no STA connected, drop */ 4355 kfree_skb(skb); 4356 skb = NULL; 4357 } 4358 4359 goto out; 4360 multicast: 4361 __skb_queue_purge(queue); 4362 __skb_queue_tail(queue, skb); 4363 out: 4364 rcu_read_unlock(); 4365 } 4366 4367 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4368 struct sk_buff *skb, u32 ctrl_flags, 4369 unsigned int link_id) 4370 { 4371 struct sk_buff *out; 4372 4373 out = skb_copy(skb, GFP_ATOMIC); 4374 if (!out) 4375 return; 4376 4377 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4378 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4379 } 4380 4381 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4382 struct sk_buff *skb) 4383 { 4384 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4385 unsigned long links = sdata->vif.valid_links; 4386 unsigned int link; 4387 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4388 4389 if (hweight16(links) == 1) { 4390 ctrl_flags |= u32_encode_bits(ffs(links) - 1, 4391 IEEE80211_TX_CTRL_MLO_LINK); 4392 4393 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4394 NULL); 4395 return; 4396 } 4397 4398 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4399 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4400 ctrl_flags = 0; 4401 } 4402 kfree_skb(skb); 4403 } 4404 4405 /** 4406 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4407 * @skb: packet to be sent 4408 * @dev: incoming interface 4409 * 4410 * On failure skb will be freed. 4411 */ 4412 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4413 struct net_device *dev) 4414 { 4415 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4416 const struct ethhdr *eth = (void *)skb->data; 4417 4418 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4419 goto normal; 4420 4421 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4422 struct sk_buff_head queue; 4423 4424 __skb_queue_head_init(&queue); 4425 ieee80211_convert_to_unicast(skb, dev, &queue); 4426 while ((skb = __skb_dequeue(&queue))) 4427 __ieee80211_subif_start_xmit(skb, dev, 0, 4428 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4429 NULL); 4430 } else if (sdata->vif.valid_links && 4431 sdata->vif.type == NL80211_IFTYPE_AP && 4432 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4433 ieee80211_mlo_multicast_tx(dev, skb); 4434 } else { 4435 normal: 4436 __ieee80211_subif_start_xmit(skb, dev, 0, 4437 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4438 NULL); 4439 } 4440 4441 return NETDEV_TX_OK; 4442 } 4443 4444 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4445 struct sk_buff *skb, struct sta_info *sta, 4446 bool txpending) 4447 { 4448 struct ieee80211_local *local = sdata->local; 4449 struct ieee80211_tx_control control = {}; 4450 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4451 struct ieee80211_sta *pubsta = NULL; 4452 unsigned long flags; 4453 int q = info->hw_queue; 4454 4455 if (sta) 4456 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4457 4458 ieee80211_tpt_led_trig_tx(local, skb->len); 4459 4460 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4461 return true; 4462 4463 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4464 4465 if (local->queue_stop_reasons[q] || 4466 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4467 if (txpending) 4468 skb_queue_head(&local->pending[q], skb); 4469 else 4470 skb_queue_tail(&local->pending[q], skb); 4471 4472 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4473 4474 return false; 4475 } 4476 4477 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4478 4479 if (sta && sta->uploaded) 4480 pubsta = &sta->sta; 4481 4482 control.sta = pubsta; 4483 4484 drv_tx(local, &control, skb); 4485 4486 return true; 4487 } 4488 4489 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4490 struct net_device *dev, struct sta_info *sta, 4491 struct ieee80211_key *key, struct sk_buff *skb) 4492 { 4493 struct ieee80211_tx_info *info; 4494 struct ieee80211_local *local = sdata->local; 4495 struct tid_ampdu_tx *tid_tx; 4496 u8 tid; 4497 4498 if (local->ops->wake_tx_queue) { 4499 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4500 skb_set_queue_mapping(skb, queue); 4501 skb_get_hash(skb); 4502 } 4503 4504 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4505 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4506 goto out_free; 4507 4508 skb = skb_share_check(skb, GFP_ATOMIC); 4509 if (unlikely(!skb)) 4510 return; 4511 4512 info = IEEE80211_SKB_CB(skb); 4513 memset(info, 0, sizeof(*info)); 4514 4515 ieee80211_aggr_check(sdata, sta, skb); 4516 4517 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4518 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4519 if (tid_tx) { 4520 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4521 /* fall back to non-offload slow path */ 4522 __ieee80211_subif_start_xmit(skb, dev, 0, 4523 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4524 NULL); 4525 return; 4526 } 4527 4528 info->flags |= IEEE80211_TX_CTL_AMPDU; 4529 if (tid_tx->timeout) 4530 tid_tx->last_tx = jiffies; 4531 } 4532 4533 if (unlikely(skb->sk && 4534 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4535 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4536 &info->flags, NULL); 4537 4538 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4539 4540 dev_sw_netstats_tx_add(dev, 1, skb->len); 4541 4542 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4543 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 4544 4545 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4546 sdata = container_of(sdata->bss, 4547 struct ieee80211_sub_if_data, u.ap); 4548 4549 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4550 info->control.vif = &sdata->vif; 4551 4552 if (key) 4553 info->control.hw_key = &key->conf; 4554 4555 ieee80211_tx_8023(sdata, skb, sta, false); 4556 4557 return; 4558 4559 out_free: 4560 kfree_skb(skb); 4561 } 4562 4563 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4564 struct net_device *dev) 4565 { 4566 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4567 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4568 struct ieee80211_key *key; 4569 struct sta_info *sta; 4570 4571 if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { 4572 kfree_skb(skb); 4573 return NETDEV_TX_OK; 4574 } 4575 4576 rcu_read_lock(); 4577 4578 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4579 kfree_skb(skb); 4580 goto out; 4581 } 4582 4583 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4584 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4585 sdata->control_port_protocol == ehdr->h_proto)) 4586 goto skip_offload; 4587 4588 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4589 if (!key) 4590 key = rcu_dereference(sdata->default_unicast_key); 4591 4592 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4593 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4594 goto skip_offload; 4595 4596 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4597 goto out; 4598 4599 skip_offload: 4600 ieee80211_subif_start_xmit(skb, dev); 4601 out: 4602 rcu_read_unlock(); 4603 4604 return NETDEV_TX_OK; 4605 } 4606 4607 struct sk_buff * 4608 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4609 struct sk_buff *skb, u32 info_flags) 4610 { 4611 struct ieee80211_hdr *hdr; 4612 struct ieee80211_tx_data tx = { 4613 .local = sdata->local, 4614 .sdata = sdata, 4615 }; 4616 struct sta_info *sta; 4617 4618 rcu_read_lock(); 4619 4620 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4621 kfree_skb(skb); 4622 skb = ERR_PTR(-EINVAL); 4623 goto out; 4624 } 4625 4626 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4627 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4628 if (IS_ERR(skb)) 4629 goto out; 4630 4631 hdr = (void *)skb->data; 4632 tx.sta = sta_info_get(sdata, hdr->addr1); 4633 tx.skb = skb; 4634 4635 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4636 rcu_read_unlock(); 4637 kfree_skb(skb); 4638 return ERR_PTR(-EINVAL); 4639 } 4640 4641 out: 4642 rcu_read_unlock(); 4643 return skb; 4644 } 4645 4646 /* 4647 * ieee80211_clear_tx_pending may not be called in a context where 4648 * it is possible that it packets could come in again. 4649 */ 4650 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4651 { 4652 struct sk_buff *skb; 4653 int i; 4654 4655 for (i = 0; i < local->hw.queues; i++) { 4656 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4657 ieee80211_free_txskb(&local->hw, skb); 4658 } 4659 } 4660 4661 /* 4662 * Returns false if the frame couldn't be transmitted but was queued instead, 4663 * which in this case means re-queued -- take as an indication to stop sending 4664 * more pending frames. 4665 */ 4666 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4667 struct sk_buff *skb) 4668 { 4669 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4670 struct ieee80211_sub_if_data *sdata; 4671 struct sta_info *sta; 4672 struct ieee80211_hdr *hdr; 4673 bool result; 4674 struct ieee80211_chanctx_conf *chanctx_conf; 4675 4676 sdata = vif_to_sdata(info->control.vif); 4677 4678 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4679 /* update band only for non-MLD */ 4680 if (!sdata->vif.valid_links) { 4681 chanctx_conf = 4682 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4683 if (unlikely(!chanctx_conf)) { 4684 dev_kfree_skb(skb); 4685 return true; 4686 } 4687 info->band = chanctx_conf->def.chan->band; 4688 } 4689 result = ieee80211_tx(sdata, NULL, skb, true); 4690 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4691 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4692 dev_kfree_skb(skb); 4693 return true; 4694 } 4695 4696 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4697 sta = NULL; 4698 4699 result = ieee80211_tx_8023(sdata, skb, sta, true); 4700 } else { 4701 struct sk_buff_head skbs; 4702 4703 __skb_queue_head_init(&skbs); 4704 __skb_queue_tail(&skbs, skb); 4705 4706 hdr = (struct ieee80211_hdr *)skb->data; 4707 sta = sta_info_get(sdata, hdr->addr1); 4708 4709 result = __ieee80211_tx(local, &skbs, sta, true); 4710 } 4711 4712 return result; 4713 } 4714 4715 /* 4716 * Transmit all pending packets. Called from tasklet. 4717 */ 4718 void ieee80211_tx_pending(struct tasklet_struct *t) 4719 { 4720 struct ieee80211_local *local = from_tasklet(local, t, 4721 tx_pending_tasklet); 4722 unsigned long flags; 4723 int i; 4724 bool txok; 4725 4726 rcu_read_lock(); 4727 4728 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4729 for (i = 0; i < local->hw.queues; i++) { 4730 /* 4731 * If queue is stopped by something other than due to pending 4732 * frames, or we have no pending frames, proceed to next queue. 4733 */ 4734 if (local->queue_stop_reasons[i] || 4735 skb_queue_empty(&local->pending[i])) 4736 continue; 4737 4738 while (!skb_queue_empty(&local->pending[i])) { 4739 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4740 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4741 4742 if (WARN_ON(!info->control.vif)) { 4743 ieee80211_free_txskb(&local->hw, skb); 4744 continue; 4745 } 4746 4747 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4748 flags); 4749 4750 txok = ieee80211_tx_pending_skb(local, skb); 4751 spin_lock_irqsave(&local->queue_stop_reason_lock, 4752 flags); 4753 if (!txok) 4754 break; 4755 } 4756 4757 if (skb_queue_empty(&local->pending[i])) 4758 ieee80211_propagate_queue_wake(local, i); 4759 } 4760 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4761 4762 rcu_read_unlock(); 4763 } 4764 4765 /* functions for drivers to get certain frames */ 4766 4767 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4768 struct ieee80211_link_data *link, 4769 struct ps_data *ps, struct sk_buff *skb, 4770 bool is_template) 4771 { 4772 u8 *pos, *tim; 4773 int aid0 = 0; 4774 int i, have_bits = 0, n1, n2; 4775 struct ieee80211_bss_conf *link_conf = link->conf; 4776 4777 /* Generate bitmap for TIM only if there are any STAs in power save 4778 * mode. */ 4779 if (atomic_read(&ps->num_sta_ps) > 0) 4780 /* in the hope that this is faster than 4781 * checking byte-for-byte */ 4782 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4783 IEEE80211_MAX_AID+1); 4784 if (!is_template) { 4785 if (ps->dtim_count == 0) 4786 ps->dtim_count = link_conf->dtim_period - 1; 4787 else 4788 ps->dtim_count--; 4789 } 4790 4791 tim = pos = skb_put(skb, 6); 4792 *pos++ = WLAN_EID_TIM; 4793 *pos++ = 4; 4794 *pos++ = ps->dtim_count; 4795 *pos++ = link_conf->dtim_period; 4796 4797 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4798 aid0 = 1; 4799 4800 ps->dtim_bc_mc = aid0 == 1; 4801 4802 if (have_bits) { 4803 /* Find largest even number N1 so that bits numbered 1 through 4804 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4805 * (N2 + 1) x 8 through 2007 are 0. */ 4806 n1 = 0; 4807 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4808 if (ps->tim[i]) { 4809 n1 = i & 0xfe; 4810 break; 4811 } 4812 } 4813 n2 = n1; 4814 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4815 if (ps->tim[i]) { 4816 n2 = i; 4817 break; 4818 } 4819 } 4820 4821 /* Bitmap control */ 4822 *pos++ = n1 | aid0; 4823 /* Part Virt Bitmap */ 4824 skb_put(skb, n2 - n1); 4825 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4826 4827 tim[1] = n2 - n1 + 4; 4828 } else { 4829 *pos++ = aid0; /* Bitmap control */ 4830 *pos++ = 0; /* Part Virt Bitmap */ 4831 } 4832 } 4833 4834 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4835 struct ieee80211_link_data *link, 4836 struct ps_data *ps, struct sk_buff *skb, 4837 bool is_template) 4838 { 4839 struct ieee80211_local *local = sdata->local; 4840 4841 /* 4842 * Not very nice, but we want to allow the driver to call 4843 * ieee80211_beacon_get() as a response to the set_tim() 4844 * callback. That, however, is already invoked under the 4845 * sta_lock to guarantee consistent and race-free update 4846 * of the tim bitmap in mac80211 and the driver. 4847 */ 4848 if (local->tim_in_locked_section) { 4849 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4850 } else { 4851 spin_lock_bh(&local->tim_lock); 4852 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4853 spin_unlock_bh(&local->tim_lock); 4854 } 4855 4856 return 0; 4857 } 4858 4859 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4860 struct beacon_data *beacon, 4861 struct ieee80211_link_data *link) 4862 { 4863 u8 *beacon_data, count, max_count = 1; 4864 struct probe_resp *resp; 4865 size_t beacon_data_len; 4866 u16 *bcn_offsets; 4867 int i; 4868 4869 switch (sdata->vif.type) { 4870 case NL80211_IFTYPE_AP: 4871 beacon_data = beacon->tail; 4872 beacon_data_len = beacon->tail_len; 4873 break; 4874 case NL80211_IFTYPE_ADHOC: 4875 beacon_data = beacon->head; 4876 beacon_data_len = beacon->head_len; 4877 break; 4878 case NL80211_IFTYPE_MESH_POINT: 4879 beacon_data = beacon->head; 4880 beacon_data_len = beacon->head_len; 4881 break; 4882 default: 4883 return; 4884 } 4885 4886 resp = rcu_dereference(link->u.ap.probe_resp); 4887 4888 bcn_offsets = beacon->cntdwn_counter_offsets; 4889 count = beacon->cntdwn_current_counter; 4890 if (link->conf->csa_active) 4891 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4892 4893 for (i = 0; i < max_count; ++i) { 4894 if (bcn_offsets[i]) { 4895 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 4896 return; 4897 beacon_data[bcn_offsets[i]] = count; 4898 } 4899 4900 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4901 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4902 4903 resp->data[resp_offsets[i]] = count; 4904 } 4905 } 4906 } 4907 4908 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4909 { 4910 beacon->cntdwn_current_counter--; 4911 4912 /* the counter should never reach 0 */ 4913 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4914 4915 return beacon->cntdwn_current_counter; 4916 } 4917 4918 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4919 { 4920 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4921 struct beacon_data *beacon = NULL; 4922 u8 count = 0; 4923 4924 rcu_read_lock(); 4925 4926 if (sdata->vif.type == NL80211_IFTYPE_AP) 4927 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4928 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4929 beacon = rcu_dereference(sdata->u.ibss.presp); 4930 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4931 beacon = rcu_dereference(sdata->u.mesh.beacon); 4932 4933 if (!beacon) 4934 goto unlock; 4935 4936 count = __ieee80211_beacon_update_cntdwn(beacon); 4937 4938 unlock: 4939 rcu_read_unlock(); 4940 return count; 4941 } 4942 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4943 4944 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4945 { 4946 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4947 struct beacon_data *beacon = NULL; 4948 4949 rcu_read_lock(); 4950 4951 if (sdata->vif.type == NL80211_IFTYPE_AP) 4952 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4953 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4954 beacon = rcu_dereference(sdata->u.ibss.presp); 4955 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4956 beacon = rcu_dereference(sdata->u.mesh.beacon); 4957 4958 if (!beacon) 4959 goto unlock; 4960 4961 if (counter < beacon->cntdwn_current_counter) 4962 beacon->cntdwn_current_counter = counter; 4963 4964 unlock: 4965 rcu_read_unlock(); 4966 } 4967 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4968 4969 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4970 { 4971 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4972 struct beacon_data *beacon = NULL; 4973 u8 *beacon_data; 4974 size_t beacon_data_len; 4975 int ret = false; 4976 4977 if (!ieee80211_sdata_running(sdata)) 4978 return false; 4979 4980 rcu_read_lock(); 4981 if (vif->type == NL80211_IFTYPE_AP) { 4982 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4983 if (WARN_ON(!beacon || !beacon->tail)) 4984 goto out; 4985 beacon_data = beacon->tail; 4986 beacon_data_len = beacon->tail_len; 4987 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4988 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4989 4990 beacon = rcu_dereference(ifibss->presp); 4991 if (!beacon) 4992 goto out; 4993 4994 beacon_data = beacon->head; 4995 beacon_data_len = beacon->head_len; 4996 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4997 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4998 4999 beacon = rcu_dereference(ifmsh->beacon); 5000 if (!beacon) 5001 goto out; 5002 5003 beacon_data = beacon->head; 5004 beacon_data_len = beacon->head_len; 5005 } else { 5006 WARN_ON(1); 5007 goto out; 5008 } 5009 5010 if (!beacon->cntdwn_counter_offsets[0]) 5011 goto out; 5012 5013 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 5014 goto out; 5015 5016 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 5017 ret = true; 5018 5019 out: 5020 rcu_read_unlock(); 5021 5022 return ret; 5023 } 5024 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 5025 5026 static int ieee80211_beacon_protect(struct sk_buff *skb, 5027 struct ieee80211_local *local, 5028 struct ieee80211_sub_if_data *sdata, 5029 struct ieee80211_link_data *link) 5030 { 5031 ieee80211_tx_result res; 5032 struct ieee80211_tx_data tx; 5033 struct sk_buff *check_skb; 5034 5035 memset(&tx, 0, sizeof(tx)); 5036 tx.key = rcu_dereference(link->default_beacon_key); 5037 if (!tx.key) 5038 return 0; 5039 tx.local = local; 5040 tx.sdata = sdata; 5041 __skb_queue_head_init(&tx.skbs); 5042 __skb_queue_tail(&tx.skbs, skb); 5043 res = ieee80211_tx_h_encrypt(&tx); 5044 check_skb = __skb_dequeue(&tx.skbs); 5045 /* we may crash after this, but it'd be a bug in crypto */ 5046 WARN_ON(check_skb != skb); 5047 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5048 return -EINVAL; 5049 5050 return 0; 5051 } 5052 5053 static void 5054 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5055 struct ieee80211_vif *vif, 5056 struct ieee80211_link_data *link, 5057 struct ieee80211_mutable_offsets *offs, 5058 struct beacon_data *beacon, 5059 struct sk_buff *skb, 5060 struct ieee80211_chanctx_conf *chanctx_conf, 5061 u16 csa_off_base) 5062 { 5063 struct ieee80211_local *local = hw_to_local(hw); 5064 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5065 struct ieee80211_tx_info *info; 5066 enum nl80211_band band; 5067 struct ieee80211_tx_rate_control txrc; 5068 5069 /* CSA offsets */ 5070 if (offs && beacon) { 5071 u16 i; 5072 5073 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5074 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5075 5076 if (!csa_off) 5077 continue; 5078 5079 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5080 } 5081 } 5082 5083 band = chanctx_conf->def.chan->band; 5084 info = IEEE80211_SKB_CB(skb); 5085 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5086 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5087 info->band = band; 5088 5089 memset(&txrc, 0, sizeof(txrc)); 5090 txrc.hw = hw; 5091 txrc.sband = local->hw.wiphy->bands[band]; 5092 txrc.bss_conf = link->conf; 5093 txrc.skb = skb; 5094 txrc.reported_rate.idx = -1; 5095 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5096 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5097 else 5098 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5099 txrc.bss = true; 5100 rate_control_get_rate(sdata, NULL, &txrc); 5101 5102 info->control.vif = vif; 5103 info->control.flags |= u32_encode_bits(link->link_id, 5104 IEEE80211_TX_CTRL_MLO_LINK); 5105 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5106 IEEE80211_TX_CTL_ASSIGN_SEQ | 5107 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5108 } 5109 5110 static void 5111 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon) 5112 { 5113 int i; 5114 5115 if (!beacon->mbssid_ies) 5116 return; 5117 5118 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5119 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5120 beacon->mbssid_ies->elem[i].len); 5121 } 5122 5123 static struct sk_buff * 5124 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5125 struct ieee80211_vif *vif, 5126 struct ieee80211_link_data *link, 5127 struct ieee80211_mutable_offsets *offs, 5128 bool is_template, 5129 struct beacon_data *beacon, 5130 struct ieee80211_chanctx_conf *chanctx_conf) 5131 { 5132 struct ieee80211_local *local = hw_to_local(hw); 5133 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5134 struct ieee80211_if_ap *ap = &sdata->u.ap; 5135 struct sk_buff *skb = NULL; 5136 u16 csa_off_base = 0; 5137 int mbssid_len; 5138 5139 if (beacon->cntdwn_counter_offsets[0]) { 5140 if (!is_template) 5141 ieee80211_beacon_update_cntdwn(vif); 5142 5143 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5144 } 5145 5146 /* headroom, head length, 5147 * tail length, maximum TIM length and multiple BSSID length 5148 */ 5149 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies); 5150 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5151 beacon->tail_len + 256 + 5152 local->hw.extra_beacon_tailroom + mbssid_len); 5153 if (!skb) 5154 return NULL; 5155 5156 skb_reserve(skb, local->tx_headroom); 5157 skb_put_data(skb, beacon->head, beacon->head_len); 5158 5159 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5160 5161 if (offs) { 5162 offs->tim_offset = beacon->head_len; 5163 offs->tim_length = skb->len - beacon->head_len; 5164 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5165 5166 if (mbssid_len) { 5167 ieee80211_beacon_add_mbssid(skb, beacon); 5168 offs->mbssid_off = skb->len - mbssid_len; 5169 } 5170 5171 /* for AP the csa offsets are from tail */ 5172 csa_off_base = skb->len; 5173 } 5174 5175 if (beacon->tail) 5176 skb_put_data(skb, beacon->tail, beacon->tail_len); 5177 5178 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5179 return NULL; 5180 5181 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5182 chanctx_conf, csa_off_base); 5183 return skb; 5184 } 5185 5186 static struct sk_buff * 5187 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5188 struct ieee80211_vif *vif, 5189 struct ieee80211_mutable_offsets *offs, 5190 bool is_template, 5191 unsigned int link_id) 5192 { 5193 struct ieee80211_local *local = hw_to_local(hw); 5194 struct beacon_data *beacon = NULL; 5195 struct sk_buff *skb = NULL; 5196 struct ieee80211_sub_if_data *sdata = NULL; 5197 struct ieee80211_chanctx_conf *chanctx_conf; 5198 struct ieee80211_link_data *link; 5199 5200 rcu_read_lock(); 5201 5202 sdata = vif_to_sdata(vif); 5203 link = rcu_dereference(sdata->link[link_id]); 5204 if (!link) 5205 goto out; 5206 chanctx_conf = 5207 rcu_dereference(link->conf->chanctx_conf); 5208 5209 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5210 goto out; 5211 5212 if (offs) 5213 memset(offs, 0, sizeof(*offs)); 5214 5215 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5216 beacon = rcu_dereference(link->u.ap.beacon); 5217 if (!beacon) 5218 goto out; 5219 5220 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template, 5221 beacon, chanctx_conf); 5222 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5223 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5224 struct ieee80211_hdr *hdr; 5225 5226 beacon = rcu_dereference(ifibss->presp); 5227 if (!beacon) 5228 goto out; 5229 5230 if (beacon->cntdwn_counter_offsets[0]) { 5231 if (!is_template) 5232 __ieee80211_beacon_update_cntdwn(beacon); 5233 5234 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5235 } 5236 5237 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5238 local->hw.extra_beacon_tailroom); 5239 if (!skb) 5240 goto out; 5241 skb_reserve(skb, local->tx_headroom); 5242 skb_put_data(skb, beacon->head, beacon->head_len); 5243 5244 hdr = (struct ieee80211_hdr *) skb->data; 5245 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5246 IEEE80211_STYPE_BEACON); 5247 5248 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5249 chanctx_conf, 0); 5250 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5251 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5252 5253 beacon = rcu_dereference(ifmsh->beacon); 5254 if (!beacon) 5255 goto out; 5256 5257 if (beacon->cntdwn_counter_offsets[0]) { 5258 if (!is_template) 5259 /* TODO: For mesh csa_counter is in TU, so 5260 * decrementing it by one isn't correct, but 5261 * for now we leave it consistent with overall 5262 * mac80211's behavior. 5263 */ 5264 __ieee80211_beacon_update_cntdwn(beacon); 5265 5266 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5267 } 5268 5269 if (ifmsh->sync_ops) 5270 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5271 5272 skb = dev_alloc_skb(local->tx_headroom + 5273 beacon->head_len + 5274 256 + /* TIM IE */ 5275 beacon->tail_len + 5276 local->hw.extra_beacon_tailroom); 5277 if (!skb) 5278 goto out; 5279 skb_reserve(skb, local->tx_headroom); 5280 skb_put_data(skb, beacon->head, beacon->head_len); 5281 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5282 is_template); 5283 5284 if (offs) { 5285 offs->tim_offset = beacon->head_len; 5286 offs->tim_length = skb->len - beacon->head_len; 5287 } 5288 5289 skb_put_data(skb, beacon->tail, beacon->tail_len); 5290 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5291 chanctx_conf, 0); 5292 } else { 5293 WARN_ON(1); 5294 goto out; 5295 } 5296 5297 out: 5298 rcu_read_unlock(); 5299 return skb; 5300 5301 } 5302 5303 struct sk_buff * 5304 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5305 struct ieee80211_vif *vif, 5306 struct ieee80211_mutable_offsets *offs, 5307 unsigned int link_id) 5308 { 5309 return __ieee80211_beacon_get(hw, vif, offs, true, link_id); 5310 } 5311 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5312 5313 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5314 struct ieee80211_vif *vif, 5315 u16 *tim_offset, u16 *tim_length, 5316 unsigned int link_id) 5317 { 5318 struct ieee80211_mutable_offsets offs = {}; 5319 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5320 link_id); 5321 struct sk_buff *copy; 5322 int shift; 5323 5324 if (!bcn) 5325 return bcn; 5326 5327 if (tim_offset) 5328 *tim_offset = offs.tim_offset; 5329 5330 if (tim_length) 5331 *tim_length = offs.tim_length; 5332 5333 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5334 !hw_to_local(hw)->monitors) 5335 return bcn; 5336 5337 /* send a copy to monitor interfaces */ 5338 copy = skb_copy(bcn, GFP_ATOMIC); 5339 if (!copy) 5340 return bcn; 5341 5342 shift = ieee80211_vif_get_shift(vif); 5343 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5344 5345 return bcn; 5346 } 5347 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5348 5349 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5350 struct ieee80211_vif *vif) 5351 { 5352 struct sk_buff *skb = NULL; 5353 struct probe_resp *presp = NULL; 5354 struct ieee80211_hdr *hdr; 5355 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5356 5357 if (sdata->vif.type != NL80211_IFTYPE_AP) 5358 return NULL; 5359 5360 rcu_read_lock(); 5361 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5362 if (!presp) 5363 goto out; 5364 5365 skb = dev_alloc_skb(presp->len); 5366 if (!skb) 5367 goto out; 5368 5369 skb_put_data(skb, presp->data, presp->len); 5370 5371 hdr = (struct ieee80211_hdr *) skb->data; 5372 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5373 5374 out: 5375 rcu_read_unlock(); 5376 return skb; 5377 } 5378 EXPORT_SYMBOL(ieee80211_proberesp_get); 5379 5380 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5381 struct ieee80211_vif *vif) 5382 { 5383 struct sk_buff *skb = NULL; 5384 struct fils_discovery_data *tmpl = NULL; 5385 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5386 5387 if (sdata->vif.type != NL80211_IFTYPE_AP) 5388 return NULL; 5389 5390 rcu_read_lock(); 5391 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5392 if (!tmpl) { 5393 rcu_read_unlock(); 5394 return NULL; 5395 } 5396 5397 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5398 if (skb) { 5399 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5400 skb_put_data(skb, tmpl->data, tmpl->len); 5401 } 5402 5403 rcu_read_unlock(); 5404 return skb; 5405 } 5406 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5407 5408 struct sk_buff * 5409 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5410 struct ieee80211_vif *vif) 5411 { 5412 struct sk_buff *skb = NULL; 5413 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5414 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5415 5416 if (sdata->vif.type != NL80211_IFTYPE_AP) 5417 return NULL; 5418 5419 rcu_read_lock(); 5420 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5421 if (!tmpl) { 5422 rcu_read_unlock(); 5423 return NULL; 5424 } 5425 5426 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5427 if (skb) { 5428 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5429 skb_put_data(skb, tmpl->data, tmpl->len); 5430 } 5431 5432 rcu_read_unlock(); 5433 return skb; 5434 } 5435 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5436 5437 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5438 struct ieee80211_vif *vif) 5439 { 5440 struct ieee80211_sub_if_data *sdata; 5441 struct ieee80211_pspoll *pspoll; 5442 struct ieee80211_local *local; 5443 struct sk_buff *skb; 5444 5445 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5446 return NULL; 5447 5448 sdata = vif_to_sdata(vif); 5449 local = sdata->local; 5450 5451 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5452 if (!skb) 5453 return NULL; 5454 5455 skb_reserve(skb, local->hw.extra_tx_headroom); 5456 5457 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5458 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5459 IEEE80211_STYPE_PSPOLL); 5460 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5461 5462 /* aid in PS-Poll has its two MSBs each set to 1 */ 5463 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5464 5465 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5466 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5467 5468 return skb; 5469 } 5470 EXPORT_SYMBOL(ieee80211_pspoll_get); 5471 5472 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5473 struct ieee80211_vif *vif, 5474 int link_id, bool qos_ok) 5475 { 5476 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5477 struct ieee80211_local *local = sdata->local; 5478 struct ieee80211_link_data *link = NULL; 5479 struct ieee80211_hdr_3addr *nullfunc; 5480 struct sk_buff *skb; 5481 bool qos = false; 5482 5483 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5484 return NULL; 5485 5486 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5487 sizeof(*nullfunc) + 2); 5488 if (!skb) 5489 return NULL; 5490 5491 rcu_read_lock(); 5492 if (qos_ok) { 5493 struct sta_info *sta; 5494 5495 sta = sta_info_get(sdata, vif->cfg.ap_addr); 5496 qos = sta && sta->sta.wme; 5497 } 5498 5499 if (link_id >= 0) { 5500 link = rcu_dereference(sdata->link[link_id]); 5501 if (WARN_ON_ONCE(!link)) { 5502 rcu_read_unlock(); 5503 kfree_skb(skb); 5504 return NULL; 5505 } 5506 } 5507 5508 skb_reserve(skb, local->hw.extra_tx_headroom); 5509 5510 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5511 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5512 IEEE80211_STYPE_NULLFUNC | 5513 IEEE80211_FCTL_TODS); 5514 if (qos) { 5515 __le16 qoshdr = cpu_to_le16(7); 5516 5517 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5518 IEEE80211_STYPE_NULLFUNC) != 5519 IEEE80211_STYPE_QOS_NULLFUNC); 5520 nullfunc->frame_control |= 5521 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5522 skb->priority = 7; 5523 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5524 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5525 } 5526 5527 if (link) { 5528 memcpy(nullfunc->addr1, link->conf->bssid, ETH_ALEN); 5529 memcpy(nullfunc->addr2, link->conf->addr, ETH_ALEN); 5530 memcpy(nullfunc->addr3, link->conf->bssid, ETH_ALEN); 5531 } else { 5532 memcpy(nullfunc->addr1, vif->cfg.ap_addr, ETH_ALEN); 5533 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5534 memcpy(nullfunc->addr3, vif->cfg.ap_addr, ETH_ALEN); 5535 } 5536 rcu_read_unlock(); 5537 5538 return skb; 5539 } 5540 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5541 5542 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5543 const u8 *src_addr, 5544 const u8 *ssid, size_t ssid_len, 5545 size_t tailroom) 5546 { 5547 struct ieee80211_local *local = hw_to_local(hw); 5548 struct ieee80211_hdr_3addr *hdr; 5549 struct sk_buff *skb; 5550 size_t ie_ssid_len; 5551 u8 *pos; 5552 5553 ie_ssid_len = 2 + ssid_len; 5554 5555 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5556 ie_ssid_len + tailroom); 5557 if (!skb) 5558 return NULL; 5559 5560 skb_reserve(skb, local->hw.extra_tx_headroom); 5561 5562 hdr = skb_put_zero(skb, sizeof(*hdr)); 5563 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5564 IEEE80211_STYPE_PROBE_REQ); 5565 eth_broadcast_addr(hdr->addr1); 5566 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5567 eth_broadcast_addr(hdr->addr3); 5568 5569 pos = skb_put(skb, ie_ssid_len); 5570 *pos++ = WLAN_EID_SSID; 5571 *pos++ = ssid_len; 5572 if (ssid_len) 5573 memcpy(pos, ssid, ssid_len); 5574 pos += ssid_len; 5575 5576 return skb; 5577 } 5578 EXPORT_SYMBOL(ieee80211_probereq_get); 5579 5580 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5581 const void *frame, size_t frame_len, 5582 const struct ieee80211_tx_info *frame_txctl, 5583 struct ieee80211_rts *rts) 5584 { 5585 const struct ieee80211_hdr *hdr = frame; 5586 5587 rts->frame_control = 5588 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5589 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5590 frame_txctl); 5591 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5592 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5593 } 5594 EXPORT_SYMBOL(ieee80211_rts_get); 5595 5596 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5597 const void *frame, size_t frame_len, 5598 const struct ieee80211_tx_info *frame_txctl, 5599 struct ieee80211_cts *cts) 5600 { 5601 const struct ieee80211_hdr *hdr = frame; 5602 5603 cts->frame_control = 5604 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5605 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5606 frame_len, frame_txctl); 5607 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5608 } 5609 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5610 5611 struct sk_buff * 5612 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5613 struct ieee80211_vif *vif) 5614 { 5615 struct ieee80211_local *local = hw_to_local(hw); 5616 struct sk_buff *skb = NULL; 5617 struct ieee80211_tx_data tx; 5618 struct ieee80211_sub_if_data *sdata; 5619 struct ps_data *ps; 5620 struct ieee80211_tx_info *info; 5621 struct ieee80211_chanctx_conf *chanctx_conf; 5622 5623 sdata = vif_to_sdata(vif); 5624 5625 rcu_read_lock(); 5626 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5627 5628 if (!chanctx_conf) 5629 goto out; 5630 5631 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5632 struct beacon_data *beacon = 5633 rcu_dereference(sdata->deflink.u.ap.beacon); 5634 5635 if (!beacon || !beacon->head) 5636 goto out; 5637 5638 ps = &sdata->u.ap.ps; 5639 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5640 ps = &sdata->u.mesh.ps; 5641 } else { 5642 goto out; 5643 } 5644 5645 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5646 goto out; /* send buffered bc/mc only after DTIM beacon */ 5647 5648 while (1) { 5649 skb = skb_dequeue(&ps->bc_buf); 5650 if (!skb) 5651 goto out; 5652 local->total_ps_buffered--; 5653 5654 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5655 struct ieee80211_hdr *hdr = 5656 (struct ieee80211_hdr *) skb->data; 5657 /* more buffered multicast/broadcast frames ==> set 5658 * MoreData flag in IEEE 802.11 header to inform PS 5659 * STAs */ 5660 hdr->frame_control |= 5661 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5662 } 5663 5664 if (sdata->vif.type == NL80211_IFTYPE_AP) 5665 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5666 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5667 break; 5668 ieee80211_free_txskb(hw, skb); 5669 } 5670 5671 info = IEEE80211_SKB_CB(skb); 5672 5673 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5674 info->band = chanctx_conf->def.chan->band; 5675 5676 if (invoke_tx_handlers(&tx)) 5677 skb = NULL; 5678 out: 5679 rcu_read_unlock(); 5680 5681 return skb; 5682 } 5683 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5684 5685 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5686 { 5687 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5688 struct ieee80211_sub_if_data *sdata = sta->sdata; 5689 struct ieee80211_local *local = sdata->local; 5690 int ret; 5691 u32 queues; 5692 5693 lockdep_assert_held(&local->sta_mtx); 5694 5695 /* only some cases are supported right now */ 5696 switch (sdata->vif.type) { 5697 case NL80211_IFTYPE_STATION: 5698 case NL80211_IFTYPE_AP: 5699 case NL80211_IFTYPE_AP_VLAN: 5700 break; 5701 default: 5702 WARN_ON(1); 5703 return -EINVAL; 5704 } 5705 5706 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5707 return -EINVAL; 5708 5709 if (sta->reserved_tid == tid) { 5710 ret = 0; 5711 goto out; 5712 } 5713 5714 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5715 sdata_err(sdata, "TID reservation already active\n"); 5716 ret = -EALREADY; 5717 goto out; 5718 } 5719 5720 ieee80211_stop_vif_queues(sdata->local, sdata, 5721 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5722 5723 synchronize_net(); 5724 5725 /* Tear down BA sessions so we stop aggregating on this TID */ 5726 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5727 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5728 __ieee80211_stop_tx_ba_session(sta, tid, 5729 AGG_STOP_LOCAL_REQUEST); 5730 } 5731 5732 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5733 __ieee80211_flush_queues(local, sdata, queues, false); 5734 5735 sta->reserved_tid = tid; 5736 5737 ieee80211_wake_vif_queues(local, sdata, 5738 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5739 5740 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5741 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5742 5743 ret = 0; 5744 out: 5745 return ret; 5746 } 5747 EXPORT_SYMBOL(ieee80211_reserve_tid); 5748 5749 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5750 { 5751 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5752 struct ieee80211_sub_if_data *sdata = sta->sdata; 5753 5754 lockdep_assert_held(&sdata->local->sta_mtx); 5755 5756 /* only some cases are supported right now */ 5757 switch (sdata->vif.type) { 5758 case NL80211_IFTYPE_STATION: 5759 case NL80211_IFTYPE_AP: 5760 case NL80211_IFTYPE_AP_VLAN: 5761 break; 5762 default: 5763 WARN_ON(1); 5764 return; 5765 } 5766 5767 if (tid != sta->reserved_tid) { 5768 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5769 return; 5770 } 5771 5772 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5773 } 5774 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5775 5776 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5777 struct sk_buff *skb, int tid, int link_id, 5778 enum nl80211_band band) 5779 { 5780 const struct ieee80211_hdr *hdr = (void *)skb->data; 5781 int ac = ieee80211_ac_from_tid(tid); 5782 unsigned int link; 5783 5784 skb_reset_mac_header(skb); 5785 skb_set_queue_mapping(skb, ac); 5786 skb->priority = tid; 5787 5788 skb->dev = sdata->dev; 5789 5790 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 5791 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 5792 IEEE80211_LINK_UNSPECIFIED)); 5793 5794 if (!sdata->vif.valid_links) { 5795 link = 0; 5796 } else if (link_id >= 0) { 5797 link = link_id; 5798 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 5799 /* address from the MLD */ 5800 link = IEEE80211_LINK_UNSPECIFIED; 5801 } else { 5802 /* otherwise must be addressed from a link */ 5803 rcu_read_lock(); 5804 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 5805 struct ieee80211_bss_conf *link_conf; 5806 5807 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 5808 if (!link_conf) 5809 continue; 5810 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 5811 break; 5812 } 5813 rcu_read_unlock(); 5814 5815 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 5816 link = ffs(sdata->vif.valid_links) - 1; 5817 } 5818 5819 IEEE80211_SKB_CB(skb)->control.flags |= 5820 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 5821 5822 /* 5823 * The other path calling ieee80211_xmit is from the tasklet, 5824 * and while we can handle concurrent transmissions locking 5825 * requirements are that we do not come into tx with bhs on. 5826 */ 5827 local_bh_disable(); 5828 IEEE80211_SKB_CB(skb)->band = band; 5829 ieee80211_xmit(sdata, NULL, skb); 5830 local_bh_enable(); 5831 } 5832 5833 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 5834 struct sk_buff *skb, int tid, int link_id) 5835 { 5836 struct ieee80211_chanctx_conf *chanctx_conf; 5837 enum nl80211_band band; 5838 5839 rcu_read_lock(); 5840 if (!sdata->vif.valid_links) { 5841 WARN_ON(link_id >= 0); 5842 chanctx_conf = 5843 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5844 if (WARN_ON(!chanctx_conf)) { 5845 rcu_read_unlock(); 5846 kfree_skb(skb); 5847 return; 5848 } 5849 band = chanctx_conf->def.chan->band; 5850 } else { 5851 WARN_ON(link_id >= 0 && 5852 !(sdata->vif.valid_links & BIT(link_id))); 5853 /* MLD transmissions must not rely on the band */ 5854 band = 0; 5855 } 5856 5857 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 5858 rcu_read_unlock(); 5859 } 5860 5861 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5862 const u8 *buf, size_t len, 5863 const u8 *dest, __be16 proto, bool unencrypted, 5864 int link_id, u64 *cookie) 5865 { 5866 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5867 struct ieee80211_local *local = sdata->local; 5868 struct sta_info *sta; 5869 struct sk_buff *skb; 5870 struct ethhdr *ehdr; 5871 u32 ctrl_flags = 0; 5872 u32 flags = 0; 5873 int err; 5874 5875 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5876 * or Pre-Authentication 5877 */ 5878 if (proto != sdata->control_port_protocol && 5879 proto != cpu_to_be16(ETH_P_PREAUTH)) 5880 return -EINVAL; 5881 5882 if (proto == sdata->control_port_protocol) 5883 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5884 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5885 5886 if (unencrypted) 5887 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5888 5889 if (cookie) 5890 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5891 5892 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5893 5894 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5895 sizeof(struct ethhdr) + len); 5896 if (!skb) 5897 return -ENOMEM; 5898 5899 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5900 5901 skb_put_data(skb, buf, len); 5902 5903 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5904 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5905 5906 /* we may override the SA for MLO STA later */ 5907 if (link_id < 0) { 5908 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 5909 IEEE80211_TX_CTRL_MLO_LINK); 5910 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5911 } else { 5912 struct ieee80211_bss_conf *link_conf; 5913 5914 ctrl_flags |= u32_encode_bits(link_id, 5915 IEEE80211_TX_CTRL_MLO_LINK); 5916 5917 rcu_read_lock(); 5918 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 5919 if (!link_conf) { 5920 dev_kfree_skb(skb); 5921 rcu_read_unlock(); 5922 return -ENOLINK; 5923 } 5924 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 5925 rcu_read_unlock(); 5926 } 5927 5928 ehdr->h_proto = proto; 5929 5930 skb->dev = dev; 5931 skb->protocol = proto; 5932 skb_reset_network_header(skb); 5933 skb_reset_mac_header(skb); 5934 5935 if (local->hw.queues < IEEE80211_NUM_ACS) 5936 goto start_xmit; 5937 5938 /* update QoS header to prioritize control port frames if possible, 5939 * priorization also happens for control port frames send over 5940 * AF_PACKET 5941 */ 5942 rcu_read_lock(); 5943 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 5944 if (err) { 5945 dev_kfree_skb(skb); 5946 rcu_read_unlock(); 5947 return err; 5948 } 5949 5950 if (!IS_ERR(sta)) { 5951 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5952 5953 skb_set_queue_mapping(skb, queue); 5954 skb_get_hash(skb); 5955 5956 /* 5957 * for MLO STA, the SA should be the AP MLD address, but 5958 * the link ID has been selected already 5959 */ 5960 if (sta && sta->sta.mlo) 5961 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5962 } 5963 rcu_read_unlock(); 5964 5965 start_xmit: 5966 /* mutex lock is only needed for incrementing the cookie counter */ 5967 mutex_lock(&local->mtx); 5968 5969 local_bh_disable(); 5970 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5971 local_bh_enable(); 5972 5973 mutex_unlock(&local->mtx); 5974 5975 return 0; 5976 } 5977 5978 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5979 const u8 *buf, size_t len) 5980 { 5981 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5982 struct ieee80211_local *local = sdata->local; 5983 struct sk_buff *skb; 5984 5985 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5986 30 + /* header size */ 5987 18); /* 11s header size */ 5988 if (!skb) 5989 return -ENOMEM; 5990 5991 skb_reserve(skb, local->hw.extra_tx_headroom); 5992 skb_put_data(skb, buf, len); 5993 5994 skb->dev = dev; 5995 skb->protocol = htons(ETH_P_802_3); 5996 skb_reset_network_header(skb); 5997 skb_reset_mac_header(skb); 5998 5999 local_bh_disable(); 6000 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 6001 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 6002 NULL); 6003 local_bh_enable(); 6004 6005 return 0; 6006 } 6007