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) 2018-2021 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 <linux/timekeeping.h> 22 #include <net/net_namespace.h> 23 #include <net/ieee80211_radiotap.h> 24 #include <net/cfg80211.h> 25 #include <net/mac80211.h> 26 #include <net/codel.h> 27 #include <net/codel_impl.h> 28 #include <asm/unaligned.h> 29 #include <net/fq_impl.h> 30 31 #include "ieee80211_i.h" 32 #include "driver-ops.h" 33 #include "led.h" 34 #include "mesh.h" 35 #include "wep.h" 36 #include "wpa.h" 37 #include "wme.h" 38 #include "rate.h" 39 40 /* misc utils */ 41 42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 43 struct sk_buff *skb, int group_addr, 44 int next_frag_len) 45 { 46 int rate, mrate, erp, dur, i, shift = 0; 47 struct ieee80211_rate *txrate; 48 struct ieee80211_local *local = tx->local; 49 struct ieee80211_supported_band *sband; 50 struct ieee80211_hdr *hdr; 51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 52 struct ieee80211_chanctx_conf *chanctx_conf; 53 u32 rate_flags = 0; 54 55 /* assume HW handles this */ 56 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 57 return 0; 58 59 rcu_read_lock(); 60 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 61 if (chanctx_conf) { 62 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 63 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 64 } 65 rcu_read_unlock(); 66 67 /* uh huh? */ 68 if (WARN_ON_ONCE(tx->rate.idx < 0)) 69 return 0; 70 71 sband = local->hw.wiphy->bands[info->band]; 72 txrate = &sband->bitrates[tx->rate.idx]; 73 74 erp = txrate->flags & IEEE80211_RATE_ERP_G; 75 76 /* device is expected to do this */ 77 if (sband->band == NL80211_BAND_S1GHZ) 78 return 0; 79 80 /* 81 * data and mgmt (except PS Poll): 82 * - during CFP: 32768 83 * - during contention period: 84 * if addr1 is group address: 0 85 * if more fragments = 0 and addr1 is individual address: time to 86 * transmit one ACK plus SIFS 87 * if more fragments = 1 and addr1 is individual address: time to 88 * transmit next fragment plus 2 x ACK plus 3 x SIFS 89 * 90 * IEEE 802.11, 9.6: 91 * - control response frame (CTS or ACK) shall be transmitted using the 92 * same rate as the immediately previous frame in the frame exchange 93 * sequence, if this rate belongs to the PHY mandatory rates, or else 94 * at the highest possible rate belonging to the PHY rates in the 95 * BSSBasicRateSet 96 */ 97 hdr = (struct ieee80211_hdr *)skb->data; 98 if (ieee80211_is_ctl(hdr->frame_control)) { 99 /* TODO: These control frames are not currently sent by 100 * mac80211, but should they be implemented, this function 101 * needs to be updated to support duration field calculation. 102 * 103 * RTS: time needed to transmit pending data/mgmt frame plus 104 * one CTS frame plus one ACK frame plus 3 x SIFS 105 * CTS: duration of immediately previous RTS minus time 106 * required to transmit CTS and its SIFS 107 * ACK: 0 if immediately previous directed data/mgmt had 108 * more=0, with more=1 duration in ACK frame is duration 109 * from previous frame minus time needed to transmit ACK 110 * and its SIFS 111 * PS Poll: BIT(15) | BIT(14) | aid 112 */ 113 return 0; 114 } 115 116 /* data/mgmt */ 117 if (0 /* FIX: data/mgmt during CFP */) 118 return cpu_to_le16(32768); 119 120 if (group_addr) /* Group address as the destination - no ACK */ 121 return 0; 122 123 /* Individual destination address: 124 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 125 * CTS and ACK frames shall be transmitted using the highest rate in 126 * basic rate set that is less than or equal to the rate of the 127 * immediately previous frame and that is using the same modulation 128 * (CCK or OFDM). If no basic rate set matches with these requirements, 129 * the highest mandatory rate of the PHY that is less than or equal to 130 * the rate of the previous frame is used. 131 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 132 */ 133 rate = -1; 134 /* use lowest available if everything fails */ 135 mrate = sband->bitrates[0].bitrate; 136 for (i = 0; i < sband->n_bitrates; i++) { 137 struct ieee80211_rate *r = &sband->bitrates[i]; 138 139 if (r->bitrate > txrate->bitrate) 140 break; 141 142 if ((rate_flags & r->flags) != rate_flags) 143 continue; 144 145 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 146 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 147 148 switch (sband->band) { 149 case NL80211_BAND_2GHZ: { 150 u32 flag; 151 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 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 ieee80211_tx_result debug_noinline 580 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 581 { 582 struct ieee80211_key *key; 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 585 586 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 587 tx->key = NULL; 588 return TX_CONTINUE; 589 } 590 591 if (tx->sta && 592 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 593 tx->key = key; 594 else if (ieee80211_is_group_privacy_action(tx->skb) && 595 (key = rcu_dereference(tx->sdata->default_multicast_key))) 596 tx->key = key; 597 else if (ieee80211_is_mgmt(hdr->frame_control) && 598 is_multicast_ether_addr(hdr->addr1) && 599 ieee80211_is_robust_mgmt_frame(tx->skb) && 600 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 601 tx->key = key; 602 else if (is_multicast_ether_addr(hdr->addr1) && 603 (key = rcu_dereference(tx->sdata->default_multicast_key))) 604 tx->key = key; 605 else if (!is_multicast_ether_addr(hdr->addr1) && 606 (key = rcu_dereference(tx->sdata->default_unicast_key))) 607 tx->key = key; 608 else 609 tx->key = NULL; 610 611 if (tx->key) { 612 bool skip_hw = false; 613 614 /* TODO: add threshold stuff again */ 615 616 switch (tx->key->conf.cipher) { 617 case WLAN_CIPHER_SUITE_WEP40: 618 case WLAN_CIPHER_SUITE_WEP104: 619 case WLAN_CIPHER_SUITE_TKIP: 620 if (!ieee80211_is_data_present(hdr->frame_control)) 621 tx->key = NULL; 622 break; 623 case WLAN_CIPHER_SUITE_CCMP: 624 case WLAN_CIPHER_SUITE_CCMP_256: 625 case WLAN_CIPHER_SUITE_GCMP: 626 case WLAN_CIPHER_SUITE_GCMP_256: 627 if (!ieee80211_is_data_present(hdr->frame_control) && 628 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 629 tx->skb) && 630 !ieee80211_is_group_privacy_action(tx->skb)) 631 tx->key = NULL; 632 else 633 skip_hw = (tx->key->conf.flags & 634 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 635 ieee80211_is_mgmt(hdr->frame_control); 636 break; 637 case WLAN_CIPHER_SUITE_AES_CMAC: 638 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 640 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 641 if (!ieee80211_is_mgmt(hdr->frame_control)) 642 tx->key = NULL; 643 break; 644 } 645 646 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 647 !ieee80211_is_deauth(hdr->frame_control))) 648 return TX_DROP; 649 650 if (!skip_hw && tx->key && 651 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 652 info->control.hw_key = &tx->key->conf; 653 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 654 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 655 return TX_DROP; 656 } 657 658 return TX_CONTINUE; 659 } 660 661 static ieee80211_tx_result debug_noinline 662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 663 { 664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 665 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 666 struct ieee80211_supported_band *sband; 667 u32 len; 668 struct ieee80211_tx_rate_control txrc; 669 struct ieee80211_sta_rates *ratetbl = NULL; 670 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 671 bool assoc = false; 672 673 memset(&txrc, 0, sizeof(txrc)); 674 675 sband = tx->local->hw.wiphy->bands[info->band]; 676 677 len = min_t(u32, tx->skb->len + FCS_LEN, 678 tx->local->hw.wiphy->frag_threshold); 679 680 /* set up the tx rate control struct we give the RC algo */ 681 txrc.hw = &tx->local->hw; 682 txrc.sband = sband; 683 txrc.bss_conf = &tx->sdata->vif.bss_conf; 684 txrc.skb = tx->skb; 685 txrc.reported_rate.idx = -1; 686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 687 688 if (tx->sdata->rc_has_mcs_mask[info->band]) 689 txrc.rate_idx_mcs_mask = 690 tx->sdata->rc_rateidx_mcs_mask[info->band]; 691 692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 695 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 696 697 /* set up RTS protection if desired */ 698 if (len > tx->local->hw.wiphy->rts_threshold) { 699 txrc.rts = true; 700 } 701 702 info->control.use_rts = txrc.rts; 703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 704 705 /* 706 * Use short preamble if the BSS can handle it, but not for 707 * management frames unless we know the receiver can handle 708 * that -- the management frame might be to a station that 709 * just wants a probe response. 710 */ 711 if (tx->sdata->vif.bss_conf.use_short_preamble && 712 (ieee80211_is_tx_data(tx->skb) || 713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 714 txrc.short_preamble = true; 715 716 info->control.short_preamble = txrc.short_preamble; 717 718 /* don't ask rate control when rate already injected via radiotap */ 719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 720 return TX_CONTINUE; 721 722 if (tx->sta) 723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 724 725 /* 726 * Lets not bother rate control if we're associated and cannot 727 * talk to the sta. This should not happen. 728 */ 729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 730 !rate_usable_index_exists(sband, &tx->sta->sta), 731 "%s: Dropped data frame as no usable bitrate found while " 732 "scanning and associated. Target station: " 733 "%pM on %d GHz band\n", 734 tx->sdata->name, 735 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 736 info->band ? 5 : 2)) 737 return TX_DROP; 738 739 /* 740 * If we're associated with the sta at this point we know we can at 741 * least send the frame at the lowest bit rate. 742 */ 743 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 744 745 if (tx->sta && !info->control.skip_table) 746 ratetbl = rcu_dereference(tx->sta->sta.rates); 747 748 if (unlikely(info->control.rates[0].idx < 0)) { 749 if (ratetbl) { 750 struct ieee80211_tx_rate rate = { 751 .idx = ratetbl->rate[0].idx, 752 .flags = ratetbl->rate[0].flags, 753 .count = ratetbl->rate[0].count 754 }; 755 756 if (ratetbl->rate[0].idx < 0) 757 return TX_DROP; 758 759 tx->rate = rate; 760 } else { 761 return TX_DROP; 762 } 763 } else { 764 tx->rate = info->control.rates[0]; 765 } 766 767 if (txrc.reported_rate.idx < 0) { 768 txrc.reported_rate = tx->rate; 769 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 770 tx->sta->tx_stats.last_rate = txrc.reported_rate; 771 } else if (tx->sta) 772 tx->sta->tx_stats.last_rate = txrc.reported_rate; 773 774 if (ratetbl) 775 return TX_CONTINUE; 776 777 if (unlikely(!info->control.rates[0].count)) 778 info->control.rates[0].count = 1; 779 780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 781 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 782 info->control.rates[0].count = 1; 783 784 return TX_CONTINUE; 785 } 786 787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 788 { 789 u16 *seq = &sta->tid_seq[tid]; 790 __le16 ret = cpu_to_le16(*seq); 791 792 /* Increase the sequence number. */ 793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 794 795 return ret; 796 } 797 798 static ieee80211_tx_result debug_noinline 799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 800 { 801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 803 int tid; 804 805 /* 806 * Packet injection may want to control the sequence 807 * number, if we have no matching interface then we 808 * neither assign one ourselves nor ask the driver to. 809 */ 810 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 811 return TX_CONTINUE; 812 813 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 814 return TX_CONTINUE; 815 816 if (ieee80211_hdrlen(hdr->frame_control) < 24) 817 return TX_CONTINUE; 818 819 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 820 return TX_CONTINUE; 821 822 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 823 return TX_CONTINUE; 824 825 /* 826 * Anything but QoS data that has a sequence number field 827 * (is long enough) gets a sequence number from the global 828 * counter. QoS data frames with a multicast destination 829 * also use the global counter (802.11-2012 9.3.2.10). 830 */ 831 if (!ieee80211_is_data_qos(hdr->frame_control) || 832 is_multicast_ether_addr(hdr->addr1)) { 833 /* driver should assign sequence number */ 834 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 835 /* for pure STA mode without beacons, we can do it */ 836 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 837 tx->sdata->sequence_number += 0x10; 838 if (tx->sta) 839 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 840 return TX_CONTINUE; 841 } 842 843 /* 844 * This should be true for injected/management frames only, for 845 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 846 * above since they are not QoS-data frames. 847 */ 848 if (!tx->sta) 849 return TX_CONTINUE; 850 851 /* include per-STA, per-TID sequence counter */ 852 tid = ieee80211_get_tid(hdr); 853 tx->sta->tx_stats.msdu[tid]++; 854 855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 856 857 return TX_CONTINUE; 858 } 859 860 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 861 struct sk_buff *skb, int hdrlen, 862 int frag_threshold) 863 { 864 struct ieee80211_local *local = tx->local; 865 struct ieee80211_tx_info *info; 866 struct sk_buff *tmp; 867 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 868 int pos = hdrlen + per_fragm; 869 int rem = skb->len - hdrlen - per_fragm; 870 871 if (WARN_ON(rem < 0)) 872 return -EINVAL; 873 874 /* first fragment was already added to queue by caller */ 875 876 while (rem) { 877 int fraglen = per_fragm; 878 879 if (fraglen > rem) 880 fraglen = rem; 881 rem -= fraglen; 882 tmp = dev_alloc_skb(local->tx_headroom + 883 frag_threshold + 884 tx->sdata->encrypt_headroom + 885 IEEE80211_ENCRYPT_TAILROOM); 886 if (!tmp) 887 return -ENOMEM; 888 889 __skb_queue_tail(&tx->skbs, tmp); 890 891 skb_reserve(tmp, 892 local->tx_headroom + tx->sdata->encrypt_headroom); 893 894 /* copy control information */ 895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 896 897 info = IEEE80211_SKB_CB(tmp); 898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 899 IEEE80211_TX_CTL_FIRST_FRAGMENT); 900 901 if (rem) 902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 903 904 skb_copy_queue_mapping(tmp, skb); 905 tmp->priority = skb->priority; 906 tmp->dev = skb->dev; 907 908 /* copy header and data */ 909 skb_put_data(tmp, skb->data, hdrlen); 910 skb_put_data(tmp, skb->data + pos, fraglen); 911 912 pos += fraglen; 913 } 914 915 /* adjust first fragment's length */ 916 skb_trim(skb, hdrlen + per_fragm); 917 return 0; 918 } 919 920 static ieee80211_tx_result debug_noinline 921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 922 { 923 struct sk_buff *skb = tx->skb; 924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 925 struct ieee80211_hdr *hdr = (void *)skb->data; 926 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 927 int hdrlen; 928 int fragnum; 929 930 /* no matter what happens, tx->skb moves to tx->skbs */ 931 __skb_queue_tail(&tx->skbs, skb); 932 tx->skb = NULL; 933 934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 935 return TX_CONTINUE; 936 937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 938 return TX_CONTINUE; 939 940 /* 941 * Warn when submitting a fragmented A-MPDU frame and drop it. 942 * This scenario is handled in ieee80211_tx_prepare but extra 943 * caution taken here as fragmented ampdu may cause Tx stop. 944 */ 945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 946 return TX_DROP; 947 948 hdrlen = ieee80211_hdrlen(hdr->frame_control); 949 950 /* internal error, why isn't DONTFRAG set? */ 951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 952 return TX_DROP; 953 954 /* 955 * Now fragment the frame. This will allocate all the fragments and 956 * chain them (using skb as the first fragment) to skb->next. 957 * During transmission, we will remove the successfully transmitted 958 * fragments from this list. When the low-level driver rejects one 959 * of the fragments then we will simply pretend to accept the skb 960 * but store it away as pending. 961 */ 962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 963 return TX_DROP; 964 965 /* update duration/seq/flags of fragments */ 966 fragnum = 0; 967 968 skb_queue_walk(&tx->skbs, skb) { 969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 970 971 hdr = (void *)skb->data; 972 info = IEEE80211_SKB_CB(skb); 973 974 if (!skb_queue_is_last(&tx->skbs, skb)) { 975 hdr->frame_control |= morefrags; 976 /* 977 * No multi-rate retries for fragmented frames, that 978 * would completely throw off the NAV at other STAs. 979 */ 980 info->control.rates[1].idx = -1; 981 info->control.rates[2].idx = -1; 982 info->control.rates[3].idx = -1; 983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 985 } else { 986 hdr->frame_control &= ~morefrags; 987 } 988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 989 fragnum++; 990 } 991 992 return TX_CONTINUE; 993 } 994 995 static ieee80211_tx_result debug_noinline 996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 997 { 998 struct sk_buff *skb; 999 int ac = -1; 1000 1001 if (!tx->sta) 1002 return TX_CONTINUE; 1003 1004 skb_queue_walk(&tx->skbs, skb) { 1005 ac = skb_get_queue_mapping(skb); 1006 tx->sta->tx_stats.bytes[ac] += skb->len; 1007 } 1008 if (ac >= 0) 1009 tx->sta->tx_stats.packets[ac]++; 1010 1011 return TX_CONTINUE; 1012 } 1013 1014 static ieee80211_tx_result debug_noinline 1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1016 { 1017 if (!tx->key) 1018 return TX_CONTINUE; 1019 1020 switch (tx->key->conf.cipher) { 1021 case WLAN_CIPHER_SUITE_WEP40: 1022 case WLAN_CIPHER_SUITE_WEP104: 1023 return ieee80211_crypto_wep_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_TKIP: 1025 return ieee80211_crypto_tkip_encrypt(tx); 1026 case WLAN_CIPHER_SUITE_CCMP: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_CCMP_256: 1030 return ieee80211_crypto_ccmp_encrypt( 1031 tx, IEEE80211_CCMP_256_MIC_LEN); 1032 case WLAN_CIPHER_SUITE_AES_CMAC: 1033 return ieee80211_crypto_aes_cmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1038 return ieee80211_crypto_aes_gmac_encrypt(tx); 1039 case WLAN_CIPHER_SUITE_GCMP: 1040 case WLAN_CIPHER_SUITE_GCMP_256: 1041 return ieee80211_crypto_gcmp_encrypt(tx); 1042 default: 1043 return ieee80211_crypto_hw_encrypt(tx); 1044 } 1045 1046 return TX_DROP; 1047 } 1048 1049 static ieee80211_tx_result debug_noinline 1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1051 { 1052 struct sk_buff *skb; 1053 struct ieee80211_hdr *hdr; 1054 int next_len; 1055 bool group_addr; 1056 1057 skb_queue_walk(&tx->skbs, skb) { 1058 hdr = (void *) skb->data; 1059 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1060 break; /* must not overwrite AID */ 1061 if (!skb_queue_is_last(&tx->skbs, skb)) { 1062 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1063 next_len = next->len; 1064 } else 1065 next_len = 0; 1066 group_addr = is_multicast_ether_addr(hdr->addr1); 1067 1068 hdr->duration_id = 1069 ieee80211_duration(tx, skb, group_addr, next_len); 1070 } 1071 1072 return TX_CONTINUE; 1073 } 1074 1075 /* actual transmit path */ 1076 1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1078 struct sk_buff *skb, 1079 struct ieee80211_tx_info *info, 1080 struct tid_ampdu_tx *tid_tx, 1081 int tid) 1082 { 1083 bool queued = false; 1084 bool reset_agg_timer = false; 1085 struct sk_buff *purge_skb = NULL; 1086 1087 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1088 info->flags |= IEEE80211_TX_CTL_AMPDU; 1089 reset_agg_timer = true; 1090 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1091 /* 1092 * nothing -- this aggregation session is being started 1093 * but that might still fail with the driver 1094 */ 1095 } else if (!tx->sta->sta.txq[tid]) { 1096 spin_lock(&tx->sta->lock); 1097 /* 1098 * Need to re-check now, because we may get here 1099 * 1100 * 1) in the window during which the setup is actually 1101 * already done, but not marked yet because not all 1102 * packets are spliced over to the driver pending 1103 * queue yet -- if this happened we acquire the lock 1104 * either before or after the splice happens, but 1105 * need to recheck which of these cases happened. 1106 * 1107 * 2) during session teardown, if the OPERATIONAL bit 1108 * was cleared due to the teardown but the pointer 1109 * hasn't been assigned NULL yet (or we loaded it 1110 * before it was assigned) -- in this case it may 1111 * now be NULL which means we should just let the 1112 * packet pass through because splicing the frames 1113 * back is already done. 1114 */ 1115 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1116 1117 if (!tid_tx) { 1118 /* do nothing, let packet pass through */ 1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1120 info->flags |= IEEE80211_TX_CTL_AMPDU; 1121 reset_agg_timer = true; 1122 } else { 1123 queued = true; 1124 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1125 clear_sta_flag(tx->sta, WLAN_STA_SP); 1126 ps_dbg(tx->sta->sdata, 1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1128 tx->sta->sta.addr, tx->sta->sta.aid); 1129 } 1130 info->control.vif = &tx->sdata->vif; 1131 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1132 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1133 __skb_queue_tail(&tid_tx->pending, skb); 1134 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1135 purge_skb = __skb_dequeue(&tid_tx->pending); 1136 } 1137 spin_unlock(&tx->sta->lock); 1138 1139 if (purge_skb) 1140 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1141 } 1142 1143 /* reset session timer */ 1144 if (reset_agg_timer) 1145 tid_tx->last_tx = jiffies; 1146 1147 return queued; 1148 } 1149 1150 /* 1151 * initialises @tx 1152 * pass %NULL for the station if unknown, a valid pointer if known 1153 * or an ERR_PTR() if the station is known not to exist 1154 */ 1155 static ieee80211_tx_result 1156 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1157 struct ieee80211_tx_data *tx, 1158 struct sta_info *sta, struct sk_buff *skb) 1159 { 1160 struct ieee80211_local *local = sdata->local; 1161 struct ieee80211_hdr *hdr; 1162 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1163 int tid; 1164 1165 memset(tx, 0, sizeof(*tx)); 1166 tx->skb = skb; 1167 tx->local = local; 1168 tx->sdata = sdata; 1169 __skb_queue_head_init(&tx->skbs); 1170 1171 /* 1172 * If this flag is set to true anywhere, and we get here, 1173 * we are doing the needed processing, so remove the flag 1174 * now. 1175 */ 1176 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1177 1178 hdr = (struct ieee80211_hdr *) skb->data; 1179 1180 if (likely(sta)) { 1181 if (!IS_ERR(sta)) 1182 tx->sta = sta; 1183 } else { 1184 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1185 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1186 if (!tx->sta && sdata->wdev.use_4addr) 1187 return TX_DROP; 1188 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1190 } 1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1192 tx->sta = sta_info_get(sdata, hdr->addr1); 1193 } 1194 1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1199 struct tid_ampdu_tx *tid_tx; 1200 1201 tid = ieee80211_get_tid(hdr); 1202 1203 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1204 if (tid_tx) { 1205 bool queued; 1206 1207 queued = ieee80211_tx_prep_agg(tx, skb, info, 1208 tid_tx, tid); 1209 1210 if (unlikely(queued)) 1211 return TX_QUEUED; 1212 } 1213 } 1214 1215 if (is_multicast_ether_addr(hdr->addr1)) { 1216 tx->flags &= ~IEEE80211_TX_UNICAST; 1217 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1218 } else 1219 tx->flags |= IEEE80211_TX_UNICAST; 1220 1221 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1222 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1223 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1224 info->flags & IEEE80211_TX_CTL_AMPDU) 1225 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1226 } 1227 1228 if (!tx->sta) 1229 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1230 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1231 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1232 ieee80211_check_fast_xmit(tx->sta); 1233 } 1234 1235 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1236 1237 return TX_CONTINUE; 1238 } 1239 1240 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1241 struct ieee80211_vif *vif, 1242 struct sta_info *sta, 1243 struct sk_buff *skb) 1244 { 1245 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1246 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1247 struct ieee80211_txq *txq = NULL; 1248 1249 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1250 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1251 return NULL; 1252 1253 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1254 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1255 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1256 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1257 vif->type == NL80211_IFTYPE_STATION) && 1258 sta && sta->uploaded) { 1259 /* 1260 * This will be NULL if the driver didn't set the 1261 * opt-in hardware flag. 1262 */ 1263 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1264 } 1265 } else if (sta) { 1266 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1267 1268 if (!sta->uploaded) 1269 return NULL; 1270 1271 txq = sta->sta.txq[tid]; 1272 } else if (vif) { 1273 txq = vif->txq; 1274 } 1275 1276 if (!txq) 1277 return NULL; 1278 1279 return to_txq_info(txq); 1280 } 1281 1282 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1283 { 1284 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1285 } 1286 1287 static u32 codel_skb_len_func(const struct sk_buff *skb) 1288 { 1289 return skb->len; 1290 } 1291 1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1293 { 1294 const struct ieee80211_tx_info *info; 1295 1296 info = (const struct ieee80211_tx_info *)skb->cb; 1297 return info->control.enqueue_time; 1298 } 1299 1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1301 void *ctx) 1302 { 1303 struct ieee80211_local *local; 1304 struct txq_info *txqi; 1305 struct fq *fq; 1306 struct fq_flow *flow; 1307 1308 txqi = ctx; 1309 local = vif_to_sdata(txqi->txq.vif)->local; 1310 fq = &local->fq; 1311 1312 if (cvars == &txqi->def_cvars) 1313 flow = &txqi->tin.default_flow; 1314 else 1315 flow = &fq->flows[cvars - local->cvars]; 1316 1317 return fq_flow_dequeue(fq, flow); 1318 } 1319 1320 static void codel_drop_func(struct sk_buff *skb, 1321 void *ctx) 1322 { 1323 struct ieee80211_local *local; 1324 struct ieee80211_hw *hw; 1325 struct txq_info *txqi; 1326 1327 txqi = ctx; 1328 local = vif_to_sdata(txqi->txq.vif)->local; 1329 hw = &local->hw; 1330 1331 ieee80211_free_txskb(hw, skb); 1332 } 1333 1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1335 struct fq_tin *tin, 1336 struct fq_flow *flow) 1337 { 1338 struct ieee80211_local *local; 1339 struct txq_info *txqi; 1340 struct codel_vars *cvars; 1341 struct codel_params *cparams; 1342 struct codel_stats *cstats; 1343 1344 local = container_of(fq, struct ieee80211_local, fq); 1345 txqi = container_of(tin, struct txq_info, tin); 1346 cstats = &txqi->cstats; 1347 1348 if (txqi->txq.sta) { 1349 struct sta_info *sta = container_of(txqi->txq.sta, 1350 struct sta_info, sta); 1351 cparams = &sta->cparams; 1352 } else { 1353 cparams = &local->cparams; 1354 } 1355 1356 if (flow == &tin->default_flow) 1357 cvars = &txqi->def_cvars; 1358 else 1359 cvars = &local->cvars[flow - fq->flows]; 1360 1361 return codel_dequeue(txqi, 1362 &flow->backlog, 1363 cparams, 1364 cvars, 1365 cstats, 1366 codel_skb_len_func, 1367 codel_skb_time_func, 1368 codel_drop_func, 1369 codel_dequeue_func); 1370 } 1371 1372 static void fq_skb_free_func(struct fq *fq, 1373 struct fq_tin *tin, 1374 struct fq_flow *flow, 1375 struct sk_buff *skb) 1376 { 1377 struct ieee80211_local *local; 1378 1379 local = container_of(fq, struct ieee80211_local, fq); 1380 ieee80211_free_txskb(&local->hw, skb); 1381 } 1382 1383 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1384 struct txq_info *txqi, 1385 struct sk_buff *skb) 1386 { 1387 struct fq *fq = &local->fq; 1388 struct fq_tin *tin = &txqi->tin; 1389 u32 flow_idx = fq_flow_idx(fq, skb); 1390 1391 ieee80211_set_skb_enqueue_time(skb); 1392 1393 spin_lock_bh(&fq->lock); 1394 /* 1395 * For management frames, don't really apply codel etc., 1396 * we don't want to apply any shaping or anything we just 1397 * want to simplify the driver API by having them on the 1398 * txqi. 1399 */ 1400 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1401 IEEE80211_SKB_CB(skb)->control.flags |= 1402 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1403 __skb_queue_tail(&txqi->frags, skb); 1404 } else { 1405 fq_tin_enqueue(fq, tin, flow_idx, skb, 1406 fq_skb_free_func); 1407 } 1408 spin_unlock_bh(&fq->lock); 1409 } 1410 1411 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1412 struct fq_flow *flow, struct sk_buff *skb, 1413 void *data) 1414 { 1415 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1416 1417 return info->control.vif == data; 1418 } 1419 1420 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1421 struct ieee80211_sub_if_data *sdata) 1422 { 1423 struct fq *fq = &local->fq; 1424 struct txq_info *txqi; 1425 struct fq_tin *tin; 1426 struct ieee80211_sub_if_data *ap; 1427 1428 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1429 return; 1430 1431 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1432 1433 if (!ap->vif.txq) 1434 return; 1435 1436 txqi = to_txq_info(ap->vif.txq); 1437 tin = &txqi->tin; 1438 1439 spin_lock_bh(&fq->lock); 1440 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1441 fq_skb_free_func); 1442 spin_unlock_bh(&fq->lock); 1443 } 1444 1445 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1446 struct sta_info *sta, 1447 struct txq_info *txqi, int tid) 1448 { 1449 fq_tin_init(&txqi->tin); 1450 codel_vars_init(&txqi->def_cvars); 1451 codel_stats_init(&txqi->cstats); 1452 __skb_queue_head_init(&txqi->frags); 1453 RB_CLEAR_NODE(&txqi->schedule_order); 1454 1455 txqi->txq.vif = &sdata->vif; 1456 1457 if (!sta) { 1458 sdata->vif.txq = &txqi->txq; 1459 txqi->txq.tid = 0; 1460 txqi->txq.ac = IEEE80211_AC_BE; 1461 1462 return; 1463 } 1464 1465 if (tid == IEEE80211_NUM_TIDS) { 1466 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1467 /* Drivers need to opt in to the management MPDU TXQ */ 1468 if (!ieee80211_hw_check(&sdata->local->hw, 1469 STA_MMPDU_TXQ)) 1470 return; 1471 } else if (!ieee80211_hw_check(&sdata->local->hw, 1472 BUFF_MMPDU_TXQ)) { 1473 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1474 return; 1475 } 1476 txqi->txq.ac = IEEE80211_AC_VO; 1477 } else { 1478 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1479 } 1480 1481 txqi->txq.sta = &sta->sta; 1482 txqi->txq.tid = tid; 1483 sta->sta.txq[tid] = &txqi->txq; 1484 } 1485 1486 void ieee80211_txq_purge(struct ieee80211_local *local, 1487 struct txq_info *txqi) 1488 { 1489 struct fq *fq = &local->fq; 1490 struct fq_tin *tin = &txqi->tin; 1491 1492 spin_lock_bh(&fq->lock); 1493 fq_tin_reset(fq, tin, fq_skb_free_func); 1494 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1495 spin_unlock_bh(&fq->lock); 1496 1497 ieee80211_unschedule_txq(&local->hw, &txqi->txq, true); 1498 } 1499 1500 void ieee80211_txq_set_params(struct ieee80211_local *local) 1501 { 1502 if (local->hw.wiphy->txq_limit) 1503 local->fq.limit = local->hw.wiphy->txq_limit; 1504 else 1505 local->hw.wiphy->txq_limit = local->fq.limit; 1506 1507 if (local->hw.wiphy->txq_memory_limit) 1508 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1509 else 1510 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1511 1512 if (local->hw.wiphy->txq_quantum) 1513 local->fq.quantum = local->hw.wiphy->txq_quantum; 1514 else 1515 local->hw.wiphy->txq_quantum = local->fq.quantum; 1516 } 1517 1518 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1519 { 1520 struct fq *fq = &local->fq; 1521 int ret; 1522 int i; 1523 bool supp_vht = false; 1524 enum nl80211_band band; 1525 1526 if (!local->ops->wake_tx_queue) 1527 return 0; 1528 1529 ret = fq_init(fq, 4096); 1530 if (ret) 1531 return ret; 1532 1533 /* 1534 * If the hardware doesn't support VHT, it is safe to limit the maximum 1535 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1536 */ 1537 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1538 struct ieee80211_supported_band *sband; 1539 1540 sband = local->hw.wiphy->bands[band]; 1541 if (!sband) 1542 continue; 1543 1544 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1545 } 1546 1547 if (!supp_vht) 1548 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1549 1550 codel_params_init(&local->cparams); 1551 local->cparams.interval = MS2TIME(100); 1552 local->cparams.target = MS2TIME(20); 1553 local->cparams.ecn = true; 1554 1555 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1556 GFP_KERNEL); 1557 if (!local->cvars) { 1558 spin_lock_bh(&fq->lock); 1559 fq_reset(fq, fq_skb_free_func); 1560 spin_unlock_bh(&fq->lock); 1561 return -ENOMEM; 1562 } 1563 1564 for (i = 0; i < fq->flows_cnt; i++) 1565 codel_vars_init(&local->cvars[i]); 1566 1567 ieee80211_txq_set_params(local); 1568 1569 return 0; 1570 } 1571 1572 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1573 { 1574 struct fq *fq = &local->fq; 1575 1576 if (!local->ops->wake_tx_queue) 1577 return; 1578 1579 kfree(local->cvars); 1580 local->cvars = NULL; 1581 1582 spin_lock_bh(&fq->lock); 1583 fq_reset(fq, fq_skb_free_func); 1584 spin_unlock_bh(&fq->lock); 1585 } 1586 1587 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1588 struct ieee80211_sub_if_data *sdata, 1589 struct sta_info *sta, 1590 struct sk_buff *skb) 1591 { 1592 struct ieee80211_vif *vif; 1593 struct txq_info *txqi; 1594 1595 if (!local->ops->wake_tx_queue || 1596 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1597 return false; 1598 1599 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1600 sdata = container_of(sdata->bss, 1601 struct ieee80211_sub_if_data, u.ap); 1602 1603 vif = &sdata->vif; 1604 txqi = ieee80211_get_txq(local, vif, sta, skb); 1605 1606 if (!txqi) 1607 return false; 1608 1609 ieee80211_txq_enqueue(local, txqi, skb); 1610 1611 schedule_and_wake_txq(local, txqi); 1612 1613 return true; 1614 } 1615 1616 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1617 struct ieee80211_vif *vif, 1618 struct sta_info *sta, 1619 struct sk_buff_head *skbs, 1620 bool txpending) 1621 { 1622 struct ieee80211_tx_control control = {}; 1623 struct sk_buff *skb, *tmp; 1624 unsigned long flags; 1625 1626 skb_queue_walk_safe(skbs, skb, tmp) { 1627 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1628 int q = info->hw_queue; 1629 1630 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1631 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1632 __skb_unlink(skb, skbs); 1633 ieee80211_free_txskb(&local->hw, skb); 1634 continue; 1635 } 1636 #endif 1637 1638 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1639 if (local->queue_stop_reasons[q] || 1640 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1641 if (unlikely(info->flags & 1642 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1643 if (local->queue_stop_reasons[q] & 1644 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1645 /* 1646 * Drop off-channel frames if queues 1647 * are stopped for any reason other 1648 * than off-channel operation. Never 1649 * queue them. 1650 */ 1651 spin_unlock_irqrestore( 1652 &local->queue_stop_reason_lock, 1653 flags); 1654 ieee80211_purge_tx_queue(&local->hw, 1655 skbs); 1656 return true; 1657 } 1658 } else { 1659 1660 /* 1661 * Since queue is stopped, queue up frames for 1662 * later transmission from the tx-pending 1663 * tasklet when the queue is woken again. 1664 */ 1665 if (txpending) 1666 skb_queue_splice_init(skbs, 1667 &local->pending[q]); 1668 else 1669 skb_queue_splice_tail_init(skbs, 1670 &local->pending[q]); 1671 1672 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1673 flags); 1674 return false; 1675 } 1676 } 1677 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1678 1679 info->control.vif = vif; 1680 control.sta = sta ? &sta->sta : NULL; 1681 1682 __skb_unlink(skb, skbs); 1683 drv_tx(local, &control, skb); 1684 } 1685 1686 return true; 1687 } 1688 1689 /* 1690 * Returns false if the frame couldn't be transmitted but was queued instead. 1691 */ 1692 static bool __ieee80211_tx(struct ieee80211_local *local, 1693 struct sk_buff_head *skbs, int led_len, 1694 struct sta_info *sta, bool txpending) 1695 { 1696 struct ieee80211_tx_info *info; 1697 struct ieee80211_sub_if_data *sdata; 1698 struct ieee80211_vif *vif; 1699 struct sk_buff *skb; 1700 bool result; 1701 __le16 fc; 1702 1703 if (WARN_ON(skb_queue_empty(skbs))) 1704 return true; 1705 1706 skb = skb_peek(skbs); 1707 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1708 info = IEEE80211_SKB_CB(skb); 1709 sdata = vif_to_sdata(info->control.vif); 1710 if (sta && !sta->uploaded) 1711 sta = NULL; 1712 1713 switch (sdata->vif.type) { 1714 case NL80211_IFTYPE_MONITOR: 1715 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1716 vif = &sdata->vif; 1717 break; 1718 } 1719 sdata = rcu_dereference(local->monitor_sdata); 1720 if (sdata) { 1721 vif = &sdata->vif; 1722 info->hw_queue = 1723 vif->hw_queue[skb_get_queue_mapping(skb)]; 1724 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1725 ieee80211_purge_tx_queue(&local->hw, skbs); 1726 return true; 1727 } else 1728 vif = NULL; 1729 break; 1730 case NL80211_IFTYPE_AP_VLAN: 1731 sdata = container_of(sdata->bss, 1732 struct ieee80211_sub_if_data, u.ap); 1733 fallthrough; 1734 default: 1735 vif = &sdata->vif; 1736 break; 1737 } 1738 1739 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1740 1741 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1742 1743 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1744 1745 return result; 1746 } 1747 1748 /* 1749 * Invoke TX handlers, return 0 on success and non-zero if the 1750 * frame was dropped or queued. 1751 * 1752 * The handlers are split into an early and late part. The latter is everything 1753 * that can be sensitive to reordering, and will be deferred to after packets 1754 * are dequeued from the intermediate queues (when they are enabled). 1755 */ 1756 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1757 { 1758 ieee80211_tx_result res = TX_DROP; 1759 1760 #define CALL_TXH(txh) \ 1761 do { \ 1762 res = txh(tx); \ 1763 if (res != TX_CONTINUE) \ 1764 goto txh_done; \ 1765 } while (0) 1766 1767 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1768 CALL_TXH(ieee80211_tx_h_check_assoc); 1769 CALL_TXH(ieee80211_tx_h_ps_buf); 1770 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1771 CALL_TXH(ieee80211_tx_h_select_key); 1772 1773 txh_done: 1774 if (unlikely(res == TX_DROP)) { 1775 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1776 if (tx->skb) 1777 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1778 else 1779 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1780 return -1; 1781 } else if (unlikely(res == TX_QUEUED)) { 1782 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1783 return -1; 1784 } 1785 1786 return 0; 1787 } 1788 1789 /* 1790 * Late handlers can be called while the sta lock is held. Handlers that can 1791 * cause packets to be generated will cause deadlock! 1792 */ 1793 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1794 { 1795 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1796 ieee80211_tx_result res = TX_CONTINUE; 1797 1798 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1799 __skb_queue_tail(&tx->skbs, tx->skb); 1800 tx->skb = NULL; 1801 goto txh_done; 1802 } 1803 1804 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1805 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1806 1807 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1808 CALL_TXH(ieee80211_tx_h_sequence); 1809 CALL_TXH(ieee80211_tx_h_fragment); 1810 /* handlers after fragment must be aware of tx info fragmentation! */ 1811 CALL_TXH(ieee80211_tx_h_stats); 1812 CALL_TXH(ieee80211_tx_h_encrypt); 1813 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1814 CALL_TXH(ieee80211_tx_h_calculate_duration); 1815 #undef CALL_TXH 1816 1817 txh_done: 1818 if (unlikely(res == TX_DROP)) { 1819 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1820 if (tx->skb) 1821 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1822 else 1823 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1824 return -1; 1825 } else if (unlikely(res == TX_QUEUED)) { 1826 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1827 return -1; 1828 } 1829 1830 return 0; 1831 } 1832 1833 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1834 { 1835 int r = invoke_tx_handlers_early(tx); 1836 1837 if (r) 1838 return r; 1839 return invoke_tx_handlers_late(tx); 1840 } 1841 1842 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1843 struct ieee80211_vif *vif, struct sk_buff *skb, 1844 int band, struct ieee80211_sta **sta) 1845 { 1846 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1847 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1848 struct ieee80211_tx_data tx; 1849 struct sk_buff *skb2; 1850 1851 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1852 return false; 1853 1854 info->band = band; 1855 info->control.vif = vif; 1856 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1857 1858 if (invoke_tx_handlers(&tx)) 1859 return false; 1860 1861 if (sta) { 1862 if (tx.sta) 1863 *sta = &tx.sta->sta; 1864 else 1865 *sta = NULL; 1866 } 1867 1868 /* this function isn't suitable for fragmented data frames */ 1869 skb2 = __skb_dequeue(&tx.skbs); 1870 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1871 ieee80211_free_txskb(hw, skb2); 1872 ieee80211_purge_tx_queue(hw, &tx.skbs); 1873 return false; 1874 } 1875 1876 return true; 1877 } 1878 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1879 1880 /* 1881 * Returns false if the frame couldn't be transmitted but was queued instead. 1882 */ 1883 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1884 struct sta_info *sta, struct sk_buff *skb, 1885 bool txpending) 1886 { 1887 struct ieee80211_local *local = sdata->local; 1888 struct ieee80211_tx_data tx; 1889 ieee80211_tx_result res_prepare; 1890 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1891 bool result = true; 1892 int led_len; 1893 1894 if (unlikely(skb->len < 10)) { 1895 dev_kfree_skb(skb); 1896 return true; 1897 } 1898 1899 /* initialises tx */ 1900 led_len = skb->len; 1901 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1902 1903 if (unlikely(res_prepare == TX_DROP)) { 1904 ieee80211_free_txskb(&local->hw, skb); 1905 return true; 1906 } else if (unlikely(res_prepare == TX_QUEUED)) { 1907 return true; 1908 } 1909 1910 /* set up hw_queue value early */ 1911 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1912 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1913 info->hw_queue = 1914 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1915 1916 if (invoke_tx_handlers_early(&tx)) 1917 return true; 1918 1919 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1920 return true; 1921 1922 if (!invoke_tx_handlers_late(&tx)) 1923 result = __ieee80211_tx(local, &tx.skbs, led_len, 1924 tx.sta, txpending); 1925 1926 return result; 1927 } 1928 1929 /* device xmit handlers */ 1930 1931 enum ieee80211_encrypt { 1932 ENCRYPT_NO, 1933 ENCRYPT_MGMT, 1934 ENCRYPT_DATA, 1935 }; 1936 1937 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1938 struct sk_buff *skb, 1939 int head_need, 1940 enum ieee80211_encrypt encrypt) 1941 { 1942 struct ieee80211_local *local = sdata->local; 1943 bool enc_tailroom; 1944 int tail_need = 0; 1945 1946 enc_tailroom = encrypt == ENCRYPT_MGMT || 1947 (encrypt == ENCRYPT_DATA && 1948 sdata->crypto_tx_tailroom_needed_cnt); 1949 1950 if (enc_tailroom) { 1951 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1952 tail_need -= skb_tailroom(skb); 1953 tail_need = max_t(int, tail_need, 0); 1954 } 1955 1956 if (skb_cloned(skb) && 1957 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1958 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1959 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1960 else if (head_need || tail_need) 1961 I802_DEBUG_INC(local->tx_expand_skb_head); 1962 else 1963 return 0; 1964 1965 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1966 wiphy_debug(local->hw.wiphy, 1967 "failed to reallocate TX buffer\n"); 1968 return -ENOMEM; 1969 } 1970 1971 return 0; 1972 } 1973 1974 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1975 struct sta_info *sta, struct sk_buff *skb) 1976 { 1977 struct ieee80211_local *local = sdata->local; 1978 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1979 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1980 int headroom; 1981 enum ieee80211_encrypt encrypt; 1982 1983 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 1984 encrypt = ENCRYPT_NO; 1985 else if (ieee80211_is_mgmt(hdr->frame_control)) 1986 encrypt = ENCRYPT_MGMT; 1987 else 1988 encrypt = ENCRYPT_DATA; 1989 1990 headroom = local->tx_headroom; 1991 if (encrypt != ENCRYPT_NO) 1992 headroom += sdata->encrypt_headroom; 1993 headroom -= skb_headroom(skb); 1994 headroom = max_t(int, 0, headroom); 1995 1996 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 1997 ieee80211_free_txskb(&local->hw, skb); 1998 return; 1999 } 2000 2001 /* reload after potential resize */ 2002 hdr = (struct ieee80211_hdr *) skb->data; 2003 info->control.vif = &sdata->vif; 2004 2005 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2006 if (ieee80211_is_data(hdr->frame_control) && 2007 is_unicast_ether_addr(hdr->addr1)) { 2008 if (mesh_nexthop_resolve(sdata, skb)) 2009 return; /* skb queued: don't free */ 2010 } else { 2011 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2012 } 2013 } 2014 2015 ieee80211_set_qos_hdr(sdata, skb); 2016 ieee80211_tx(sdata, sta, skb, false); 2017 } 2018 2019 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2020 { 2021 struct ieee80211_radiotap_header *rthdr = 2022 (struct ieee80211_radiotap_header *)skb->data; 2023 2024 /* check for not even having the fixed radiotap header part */ 2025 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2026 return false; /* too short to be possibly valid */ 2027 2028 /* is it a header version we can trust to find length from? */ 2029 if (unlikely(rthdr->it_version)) 2030 return false; /* only version 0 is supported */ 2031 2032 /* does the skb contain enough to deliver on the alleged length? */ 2033 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2034 return false; /* skb too short for claimed rt header extent */ 2035 2036 return true; 2037 } 2038 2039 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2040 struct net_device *dev) 2041 { 2042 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2043 struct ieee80211_radiotap_iterator iterator; 2044 struct ieee80211_radiotap_header *rthdr = 2045 (struct ieee80211_radiotap_header *) skb->data; 2046 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2047 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2048 NULL); 2049 u16 txflags; 2050 u16 rate = 0; 2051 bool rate_found = false; 2052 u8 rate_retries = 0; 2053 u16 rate_flags = 0; 2054 u8 mcs_known, mcs_flags, mcs_bw; 2055 u16 vht_known; 2056 u8 vht_mcs = 0, vht_nss = 0; 2057 int i; 2058 2059 if (!ieee80211_validate_radiotap_len(skb)) 2060 return false; 2061 2062 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2063 IEEE80211_TX_CTL_DONTFRAG; 2064 2065 /* 2066 * for every radiotap entry that is present 2067 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2068 * entries present, or -EINVAL on error) 2069 */ 2070 2071 while (!ret) { 2072 ret = ieee80211_radiotap_iterator_next(&iterator); 2073 2074 if (ret) 2075 continue; 2076 2077 /* see if this argument is something we can use */ 2078 switch (iterator.this_arg_index) { 2079 /* 2080 * You must take care when dereferencing iterator.this_arg 2081 * for multibyte types... the pointer is not aligned. Use 2082 * get_unaligned((type *)iterator.this_arg) to dereference 2083 * iterator.this_arg for type "type" safely on all arches. 2084 */ 2085 case IEEE80211_RADIOTAP_FLAGS: 2086 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2087 /* 2088 * this indicates that the skb we have been 2089 * handed has the 32-bit FCS CRC at the end... 2090 * we should react to that by snipping it off 2091 * because it will be recomputed and added 2092 * on transmission 2093 */ 2094 if (skb->len < (iterator._max_length + FCS_LEN)) 2095 return false; 2096 2097 skb_trim(skb, skb->len - FCS_LEN); 2098 } 2099 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2100 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2101 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2102 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2103 break; 2104 2105 case IEEE80211_RADIOTAP_TX_FLAGS: 2106 txflags = get_unaligned_le16(iterator.this_arg); 2107 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2108 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2109 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2110 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2111 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2112 info->control.flags |= 2113 IEEE80211_TX_CTRL_DONT_REORDER; 2114 break; 2115 2116 case IEEE80211_RADIOTAP_RATE: 2117 rate = *iterator.this_arg; 2118 rate_flags = 0; 2119 rate_found = true; 2120 break; 2121 2122 case IEEE80211_RADIOTAP_DATA_RETRIES: 2123 rate_retries = *iterator.this_arg; 2124 break; 2125 2126 case IEEE80211_RADIOTAP_MCS: 2127 mcs_known = iterator.this_arg[0]; 2128 mcs_flags = iterator.this_arg[1]; 2129 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2130 break; 2131 2132 rate_found = true; 2133 rate = iterator.this_arg[2]; 2134 rate_flags = IEEE80211_TX_RC_MCS; 2135 2136 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2137 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2138 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2139 2140 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2141 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2142 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2143 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2144 2145 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2146 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2147 info->flags |= IEEE80211_TX_CTL_LDPC; 2148 2149 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2150 u8 stbc = u8_get_bits(mcs_flags, 2151 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2152 2153 info->flags |= 2154 u32_encode_bits(stbc, 2155 IEEE80211_TX_CTL_STBC); 2156 } 2157 break; 2158 2159 case IEEE80211_RADIOTAP_VHT: 2160 vht_known = get_unaligned_le16(iterator.this_arg); 2161 rate_found = true; 2162 2163 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2164 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2165 (iterator.this_arg[2] & 2166 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2167 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2168 if (vht_known & 2169 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2170 if (iterator.this_arg[3] == 1) 2171 rate_flags |= 2172 IEEE80211_TX_RC_40_MHZ_WIDTH; 2173 else if (iterator.this_arg[3] == 4) 2174 rate_flags |= 2175 IEEE80211_TX_RC_80_MHZ_WIDTH; 2176 else if (iterator.this_arg[3] == 11) 2177 rate_flags |= 2178 IEEE80211_TX_RC_160_MHZ_WIDTH; 2179 } 2180 2181 vht_mcs = iterator.this_arg[4] >> 4; 2182 vht_nss = iterator.this_arg[4] & 0xF; 2183 break; 2184 2185 /* 2186 * Please update the file 2187 * Documentation/networking/mac80211-injection.rst 2188 * when parsing new fields here. 2189 */ 2190 2191 default: 2192 break; 2193 } 2194 } 2195 2196 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2197 return false; 2198 2199 if (rate_found) { 2200 struct ieee80211_supported_band *sband = 2201 local->hw.wiphy->bands[info->band]; 2202 2203 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2204 2205 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2206 info->control.rates[i].idx = -1; 2207 info->control.rates[i].flags = 0; 2208 info->control.rates[i].count = 0; 2209 } 2210 2211 if (rate_flags & IEEE80211_TX_RC_MCS) { 2212 info->control.rates[0].idx = rate; 2213 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2214 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2215 vht_nss); 2216 } else if (sband) { 2217 for (i = 0; i < sband->n_bitrates; i++) { 2218 if (rate * 5 != sband->bitrates[i].bitrate) 2219 continue; 2220 2221 info->control.rates[0].idx = i; 2222 break; 2223 } 2224 } 2225 2226 if (info->control.rates[0].idx < 0) 2227 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2228 2229 info->control.rates[0].flags = rate_flags; 2230 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2231 local->hw.max_rate_tries); 2232 } 2233 2234 return true; 2235 } 2236 2237 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2238 struct net_device *dev) 2239 { 2240 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2241 struct ieee80211_chanctx_conf *chanctx_conf; 2242 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2243 struct ieee80211_hdr *hdr; 2244 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2245 struct cfg80211_chan_def *chandef; 2246 u16 len_rthdr; 2247 int hdrlen; 2248 2249 memset(info, 0, sizeof(*info)); 2250 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2251 IEEE80211_TX_CTL_INJECTED; 2252 2253 /* Sanity-check the length of the radiotap header */ 2254 if (!ieee80211_validate_radiotap_len(skb)) 2255 goto fail; 2256 2257 /* we now know there is a radiotap header with a length we can use */ 2258 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2259 2260 /* 2261 * fix up the pointers accounting for the radiotap 2262 * header still being in there. We are being given 2263 * a precooked IEEE80211 header so no need for 2264 * normal processing 2265 */ 2266 skb_set_mac_header(skb, len_rthdr); 2267 /* 2268 * these are just fixed to the end of the rt area since we 2269 * don't have any better information and at this point, nobody cares 2270 */ 2271 skb_set_network_header(skb, len_rthdr); 2272 skb_set_transport_header(skb, len_rthdr); 2273 2274 if (skb->len < len_rthdr + 2) 2275 goto fail; 2276 2277 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2278 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2279 2280 if (skb->len < len_rthdr + hdrlen) 2281 goto fail; 2282 2283 /* 2284 * Initialize skb->protocol if the injected frame is a data frame 2285 * carrying a rfc1042 header 2286 */ 2287 if (ieee80211_is_data(hdr->frame_control) && 2288 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2289 u8 *payload = (u8 *)hdr + hdrlen; 2290 2291 if (ether_addr_equal(payload, rfc1042_header)) 2292 skb->protocol = cpu_to_be16((payload[6] << 8) | 2293 payload[7]); 2294 } 2295 2296 rcu_read_lock(); 2297 2298 /* 2299 * We process outgoing injected frames that have a local address 2300 * we handle as though they are non-injected frames. 2301 * This code here isn't entirely correct, the local MAC address 2302 * isn't always enough to find the interface to use; for proper 2303 * VLAN support we have an nl80211-based mechanism. 2304 * 2305 * This is necessary, for example, for old hostapd versions that 2306 * don't use nl80211-based management TX/RX. 2307 */ 2308 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2309 2310 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2311 if (!ieee80211_sdata_running(tmp_sdata)) 2312 continue; 2313 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2314 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2315 continue; 2316 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2317 sdata = tmp_sdata; 2318 break; 2319 } 2320 } 2321 2322 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2323 if (!chanctx_conf) { 2324 tmp_sdata = rcu_dereference(local->monitor_sdata); 2325 if (tmp_sdata) 2326 chanctx_conf = 2327 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2328 } 2329 2330 if (chanctx_conf) 2331 chandef = &chanctx_conf->def; 2332 else if (!local->use_chanctx) 2333 chandef = &local->_oper_chandef; 2334 else 2335 goto fail_rcu; 2336 2337 /* 2338 * Frame injection is not allowed if beaconing is not allowed 2339 * or if we need radar detection. Beaconing is usually not allowed when 2340 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2341 * Passive scan is also used in world regulatory domains where 2342 * your country is not known and as such it should be treated as 2343 * NO TX unless the channel is explicitly allowed in which case 2344 * your current regulatory domain would not have the passive scan 2345 * flag. 2346 * 2347 * Since AP mode uses monitor interfaces to inject/TX management 2348 * frames we can make AP mode the exception to this rule once it 2349 * supports radar detection as its implementation can deal with 2350 * radar detection by itself. We can do that later by adding a 2351 * monitor flag interfaces used for AP support. 2352 */ 2353 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2354 sdata->vif.type)) 2355 goto fail_rcu; 2356 2357 info->band = chandef->chan->band; 2358 2359 /* Initialize skb->priority according to frame type and TID class, 2360 * with respect to the sub interface that the frame will actually 2361 * be transmitted on. If the DONT_REORDER flag is set, the original 2362 * skb-priority is preserved to assure frames injected with this 2363 * flag are not reordered relative to each other. 2364 */ 2365 ieee80211_select_queue_80211(sdata, skb, hdr); 2366 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2367 2368 /* 2369 * Process the radiotap header. This will now take into account the 2370 * selected chandef above to accurately set injection rates and 2371 * retransmissions. 2372 */ 2373 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2374 goto fail_rcu; 2375 2376 /* remove the injection radiotap header */ 2377 skb_pull(skb, len_rthdr); 2378 2379 ieee80211_xmit(sdata, NULL, skb); 2380 rcu_read_unlock(); 2381 2382 return NETDEV_TX_OK; 2383 2384 fail_rcu: 2385 rcu_read_unlock(); 2386 fail: 2387 dev_kfree_skb(skb); 2388 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2389 } 2390 2391 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2392 { 2393 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2394 2395 return ethertype == ETH_P_TDLS && 2396 skb->len > 14 && 2397 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2398 } 2399 2400 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2401 struct sk_buff *skb, 2402 struct sta_info **sta_out) 2403 { 2404 struct sta_info *sta; 2405 2406 switch (sdata->vif.type) { 2407 case NL80211_IFTYPE_AP_VLAN: 2408 sta = rcu_dereference(sdata->u.vlan.sta); 2409 if (sta) { 2410 *sta_out = sta; 2411 return 0; 2412 } else if (sdata->wdev.use_4addr) { 2413 return -ENOLINK; 2414 } 2415 fallthrough; 2416 case NL80211_IFTYPE_AP: 2417 case NL80211_IFTYPE_OCB: 2418 case NL80211_IFTYPE_ADHOC: 2419 if (is_multicast_ether_addr(skb->data)) { 2420 *sta_out = ERR_PTR(-ENOENT); 2421 return 0; 2422 } 2423 sta = sta_info_get_bss(sdata, skb->data); 2424 break; 2425 #ifdef CONFIG_MAC80211_MESH 2426 case NL80211_IFTYPE_MESH_POINT: 2427 /* determined much later */ 2428 *sta_out = NULL; 2429 return 0; 2430 #endif 2431 case NL80211_IFTYPE_STATION: 2432 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2433 sta = sta_info_get(sdata, skb->data); 2434 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2435 if (test_sta_flag(sta, 2436 WLAN_STA_TDLS_PEER_AUTH)) { 2437 *sta_out = sta; 2438 return 0; 2439 } 2440 2441 /* 2442 * TDLS link during setup - throw out frames to 2443 * peer. Allow TDLS-setup frames to unauthorized 2444 * peers for the special case of a link teardown 2445 * after a TDLS sta is removed due to being 2446 * unreachable. 2447 */ 2448 if (!ieee80211_is_tdls_setup(skb)) 2449 return -EINVAL; 2450 } 2451 2452 } 2453 2454 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2455 if (!sta) 2456 return -ENOLINK; 2457 break; 2458 default: 2459 return -EINVAL; 2460 } 2461 2462 *sta_out = sta ?: ERR_PTR(-ENOENT); 2463 return 0; 2464 } 2465 2466 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2467 struct sk_buff *skb, 2468 u32 *info_flags, 2469 u64 *cookie) 2470 { 2471 struct sk_buff *ack_skb; 2472 u16 info_id = 0; 2473 2474 if (skb->sk) 2475 ack_skb = skb_clone_sk(skb); 2476 else 2477 ack_skb = skb_clone(skb, GFP_ATOMIC); 2478 2479 if (ack_skb) { 2480 unsigned long flags; 2481 int id; 2482 2483 spin_lock_irqsave(&local->ack_status_lock, flags); 2484 id = idr_alloc(&local->ack_status_frames, ack_skb, 2485 1, 0x2000, GFP_ATOMIC); 2486 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2487 2488 if (id >= 0) { 2489 info_id = id; 2490 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2491 if (cookie) { 2492 *cookie = ieee80211_mgmt_tx_cookie(local); 2493 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2494 } 2495 } else { 2496 kfree_skb(ack_skb); 2497 } 2498 } 2499 2500 return info_id; 2501 } 2502 2503 /** 2504 * ieee80211_build_hdr - build 802.11 header in the given frame 2505 * @sdata: virtual interface to build the header for 2506 * @skb: the skb to build the header in 2507 * @info_flags: skb flags to set 2508 * @sta: the station pointer 2509 * @ctrl_flags: info control flags to set 2510 * @cookie: cookie pointer to fill (if not %NULL) 2511 * 2512 * This function takes the skb with 802.3 header and reformats the header to 2513 * the appropriate IEEE 802.11 header based on which interface the packet is 2514 * being transmitted on. 2515 * 2516 * Note that this function also takes care of the TX status request and 2517 * potential unsharing of the SKB - this needs to be interleaved with the 2518 * header building. 2519 * 2520 * The function requires the read-side RCU lock held 2521 * 2522 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2523 */ 2524 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2525 struct sk_buff *skb, u32 info_flags, 2526 struct sta_info *sta, u32 ctrl_flags, 2527 u64 *cookie) 2528 { 2529 struct ieee80211_local *local = sdata->local; 2530 struct ieee80211_tx_info *info; 2531 int head_need; 2532 u16 ethertype, hdrlen, meshhdrlen = 0; 2533 __le16 fc; 2534 struct ieee80211_hdr hdr; 2535 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2536 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2537 const u8 *encaps_data; 2538 int encaps_len, skip_header_bytes; 2539 bool wme_sta = false, authorized = false; 2540 bool tdls_peer; 2541 bool multicast; 2542 u16 info_id = 0; 2543 struct ieee80211_chanctx_conf *chanctx_conf; 2544 struct ieee80211_sub_if_data *ap_sdata; 2545 enum nl80211_band band; 2546 int ret; 2547 2548 if (IS_ERR(sta)) 2549 sta = NULL; 2550 2551 #ifdef CONFIG_MAC80211_DEBUGFS 2552 if (local->force_tx_status) 2553 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2554 #endif 2555 2556 /* convert Ethernet header to proper 802.11 header (based on 2557 * operation mode) */ 2558 ethertype = (skb->data[12] << 8) | skb->data[13]; 2559 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2560 2561 switch (sdata->vif.type) { 2562 case NL80211_IFTYPE_AP_VLAN: 2563 if (sdata->wdev.use_4addr) { 2564 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2565 /* RA TA DA SA */ 2566 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2567 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2568 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2569 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2570 hdrlen = 30; 2571 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2572 wme_sta = sta->sta.wme; 2573 } 2574 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2575 u.ap); 2576 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2577 if (!chanctx_conf) { 2578 ret = -ENOTCONN; 2579 goto free; 2580 } 2581 band = chanctx_conf->def.chan->band; 2582 if (sdata->wdev.use_4addr) 2583 break; 2584 fallthrough; 2585 case NL80211_IFTYPE_AP: 2586 if (sdata->vif.type == NL80211_IFTYPE_AP) 2587 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2588 if (!chanctx_conf) { 2589 ret = -ENOTCONN; 2590 goto free; 2591 } 2592 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2593 /* DA BSSID SA */ 2594 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2595 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2596 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2597 hdrlen = 24; 2598 band = chanctx_conf->def.chan->band; 2599 break; 2600 #ifdef CONFIG_MAC80211_MESH 2601 case NL80211_IFTYPE_MESH_POINT: 2602 if (!is_multicast_ether_addr(skb->data)) { 2603 struct sta_info *next_hop; 2604 bool mpp_lookup = true; 2605 2606 mpath = mesh_path_lookup(sdata, skb->data); 2607 if (mpath) { 2608 mpp_lookup = false; 2609 next_hop = rcu_dereference(mpath->next_hop); 2610 if (!next_hop || 2611 !(mpath->flags & (MESH_PATH_ACTIVE | 2612 MESH_PATH_RESOLVING))) 2613 mpp_lookup = true; 2614 } 2615 2616 if (mpp_lookup) { 2617 mppath = mpp_path_lookup(sdata, skb->data); 2618 if (mppath) 2619 mppath->exp_time = jiffies; 2620 } 2621 2622 if (mppath && mpath) 2623 mesh_path_del(sdata, mpath->dst); 2624 } 2625 2626 /* 2627 * Use address extension if it is a packet from 2628 * another interface or if we know the destination 2629 * is being proxied by a portal (i.e. portal address 2630 * differs from proxied address) 2631 */ 2632 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2633 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2634 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2635 skb->data, skb->data + ETH_ALEN); 2636 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2637 NULL, NULL); 2638 } else { 2639 /* DS -> MBSS (802.11-2012 13.11.3.3). 2640 * For unicast with unknown forwarding information, 2641 * destination might be in the MBSS or if that fails 2642 * forwarded to another mesh gate. In either case 2643 * resolution will be handled in ieee80211_xmit(), so 2644 * leave the original DA. This also works for mcast */ 2645 const u8 *mesh_da = skb->data; 2646 2647 if (mppath) 2648 mesh_da = mppath->mpp; 2649 else if (mpath) 2650 mesh_da = mpath->dst; 2651 2652 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2653 mesh_da, sdata->vif.addr); 2654 if (is_multicast_ether_addr(mesh_da)) 2655 /* DA TA mSA AE:SA */ 2656 meshhdrlen = ieee80211_new_mesh_header( 2657 sdata, &mesh_hdr, 2658 skb->data + ETH_ALEN, NULL); 2659 else 2660 /* RA TA mDA mSA AE:DA SA */ 2661 meshhdrlen = ieee80211_new_mesh_header( 2662 sdata, &mesh_hdr, skb->data, 2663 skb->data + ETH_ALEN); 2664 2665 } 2666 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2667 if (!chanctx_conf) { 2668 ret = -ENOTCONN; 2669 goto free; 2670 } 2671 band = chanctx_conf->def.chan->band; 2672 2673 /* For injected frames, fill RA right away as nexthop lookup 2674 * will be skipped. 2675 */ 2676 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2677 is_zero_ether_addr(hdr.addr1)) 2678 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2679 break; 2680 #endif 2681 case NL80211_IFTYPE_STATION: 2682 /* we already did checks when looking up the RA STA */ 2683 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2684 2685 if (tdls_peer) { 2686 /* DA SA BSSID */ 2687 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2688 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2689 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2690 hdrlen = 24; 2691 } else if (sdata->u.mgd.use_4addr && 2692 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2693 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2694 IEEE80211_FCTL_TODS); 2695 /* RA TA DA SA */ 2696 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2697 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2698 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2699 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2700 hdrlen = 30; 2701 } else { 2702 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2703 /* BSSID SA DA */ 2704 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2705 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2706 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2707 hdrlen = 24; 2708 } 2709 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2710 if (!chanctx_conf) { 2711 ret = -ENOTCONN; 2712 goto free; 2713 } 2714 band = chanctx_conf->def.chan->band; 2715 break; 2716 case NL80211_IFTYPE_OCB: 2717 /* DA SA BSSID */ 2718 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2719 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2720 eth_broadcast_addr(hdr.addr3); 2721 hdrlen = 24; 2722 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2723 if (!chanctx_conf) { 2724 ret = -ENOTCONN; 2725 goto free; 2726 } 2727 band = chanctx_conf->def.chan->band; 2728 break; 2729 case NL80211_IFTYPE_ADHOC: 2730 /* DA SA BSSID */ 2731 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2732 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2733 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2734 hdrlen = 24; 2735 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2736 if (!chanctx_conf) { 2737 ret = -ENOTCONN; 2738 goto free; 2739 } 2740 band = chanctx_conf->def.chan->band; 2741 break; 2742 default: 2743 ret = -EINVAL; 2744 goto free; 2745 } 2746 2747 multicast = is_multicast_ether_addr(hdr.addr1); 2748 2749 /* sta is always NULL for mesh */ 2750 if (sta) { 2751 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2752 wme_sta = sta->sta.wme; 2753 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2754 /* For mesh, the use of the QoS header is mandatory */ 2755 wme_sta = true; 2756 } 2757 2758 /* receiver does QoS (which also means we do) use it */ 2759 if (wme_sta) { 2760 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2761 hdrlen += 2; 2762 } 2763 2764 /* 2765 * Drop unicast frames to unauthorised stations unless they are 2766 * EAPOL frames from the local station. 2767 */ 2768 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2769 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2770 !multicast && !authorized && 2771 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2772 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2773 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2774 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2775 sdata->name, hdr.addr1); 2776 #endif 2777 2778 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2779 2780 ret = -EPERM; 2781 goto free; 2782 } 2783 2784 if (unlikely(!multicast && ((skb->sk && 2785 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2786 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2787 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2788 cookie); 2789 2790 /* 2791 * If the skb is shared we need to obtain our own copy. 2792 */ 2793 if (skb_shared(skb)) { 2794 struct sk_buff *tmp_skb = skb; 2795 2796 /* can't happen -- skb is a clone if info_id != 0 */ 2797 WARN_ON(info_id); 2798 2799 skb = skb_clone(skb, GFP_ATOMIC); 2800 kfree_skb(tmp_skb); 2801 2802 if (!skb) { 2803 ret = -ENOMEM; 2804 goto free; 2805 } 2806 } 2807 2808 hdr.frame_control = fc; 2809 hdr.duration_id = 0; 2810 hdr.seq_ctrl = 0; 2811 2812 skip_header_bytes = ETH_HLEN; 2813 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2814 encaps_data = bridge_tunnel_header; 2815 encaps_len = sizeof(bridge_tunnel_header); 2816 skip_header_bytes -= 2; 2817 } else if (ethertype >= ETH_P_802_3_MIN) { 2818 encaps_data = rfc1042_header; 2819 encaps_len = sizeof(rfc1042_header); 2820 skip_header_bytes -= 2; 2821 } else { 2822 encaps_data = NULL; 2823 encaps_len = 0; 2824 } 2825 2826 skb_pull(skb, skip_header_bytes); 2827 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2828 2829 /* 2830 * So we need to modify the skb header and hence need a copy of 2831 * that. The head_need variable above doesn't, so far, include 2832 * the needed header space that we don't need right away. If we 2833 * can, then we don't reallocate right now but only after the 2834 * frame arrives at the master device (if it does...) 2835 * 2836 * If we cannot, however, then we will reallocate to include all 2837 * the ever needed space. Also, if we need to reallocate it anyway, 2838 * make it big enough for everything we may ever need. 2839 */ 2840 2841 if (head_need > 0 || skb_cloned(skb)) { 2842 head_need += sdata->encrypt_headroom; 2843 head_need += local->tx_headroom; 2844 head_need = max_t(int, 0, head_need); 2845 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2846 ieee80211_free_txskb(&local->hw, skb); 2847 skb = NULL; 2848 return ERR_PTR(-ENOMEM); 2849 } 2850 } 2851 2852 if (encaps_data) 2853 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2854 2855 #ifdef CONFIG_MAC80211_MESH 2856 if (meshhdrlen > 0) 2857 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2858 #endif 2859 2860 if (ieee80211_is_data_qos(fc)) { 2861 __le16 *qos_control; 2862 2863 qos_control = skb_push(skb, 2); 2864 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2865 /* 2866 * Maybe we could actually set some fields here, for now just 2867 * initialise to zero to indicate no special operation. 2868 */ 2869 *qos_control = 0; 2870 } else 2871 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2872 2873 skb_reset_mac_header(skb); 2874 2875 info = IEEE80211_SKB_CB(skb); 2876 memset(info, 0, sizeof(*info)); 2877 2878 info->flags = info_flags; 2879 info->ack_frame_id = info_id; 2880 info->band = band; 2881 info->control.flags = ctrl_flags; 2882 2883 return skb; 2884 free: 2885 kfree_skb(skb); 2886 return ERR_PTR(ret); 2887 } 2888 2889 /* 2890 * fast-xmit overview 2891 * 2892 * The core idea of this fast-xmit is to remove per-packet checks by checking 2893 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2894 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2895 * much less work can be done per packet. For example, fragmentation must be 2896 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2897 * in the code here. 2898 * 2899 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2900 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2901 * 2902 * The most difficult part of this is that when any of these assumptions 2903 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2904 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2905 * since the per-packet code no longer checks the conditions. This is reflected 2906 * by the calls to these functions throughout the rest of the code, and must be 2907 * maintained if any of the TX path checks change. 2908 */ 2909 2910 void ieee80211_check_fast_xmit(struct sta_info *sta) 2911 { 2912 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2913 struct ieee80211_local *local = sta->local; 2914 struct ieee80211_sub_if_data *sdata = sta->sdata; 2915 struct ieee80211_hdr *hdr = (void *)build.hdr; 2916 struct ieee80211_chanctx_conf *chanctx_conf; 2917 __le16 fc; 2918 2919 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2920 return; 2921 2922 /* Locking here protects both the pointer itself, and against concurrent 2923 * invocations winning data access races to, e.g., the key pointer that 2924 * is used. 2925 * Without it, the invocation of this function right after the key 2926 * pointer changes wouldn't be sufficient, as another CPU could access 2927 * the pointer, then stall, and then do the cache update after the CPU 2928 * that invalidated the key. 2929 * With the locking, such scenarios cannot happen as the check for the 2930 * key and the fast-tx assignment are done atomically, so the CPU that 2931 * modifies the key will either wait or other one will see the key 2932 * cleared/changed already. 2933 */ 2934 spin_lock_bh(&sta->lock); 2935 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2936 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2937 sdata->vif.type == NL80211_IFTYPE_STATION) 2938 goto out; 2939 2940 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2941 goto out; 2942 2943 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2944 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2945 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2946 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2947 goto out; 2948 2949 if (sdata->noack_map) 2950 goto out; 2951 2952 /* fast-xmit doesn't handle fragmentation at all */ 2953 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2954 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2955 goto out; 2956 2957 rcu_read_lock(); 2958 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2959 if (!chanctx_conf) { 2960 rcu_read_unlock(); 2961 goto out; 2962 } 2963 build.band = chanctx_conf->def.chan->band; 2964 rcu_read_unlock(); 2965 2966 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2967 2968 switch (sdata->vif.type) { 2969 case NL80211_IFTYPE_ADHOC: 2970 /* DA SA BSSID */ 2971 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2972 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2973 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2974 build.hdr_len = 24; 2975 break; 2976 case NL80211_IFTYPE_STATION: 2977 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2978 /* DA SA BSSID */ 2979 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2980 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2981 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2982 build.hdr_len = 24; 2983 break; 2984 } 2985 2986 if (sdata->u.mgd.use_4addr) { 2987 /* non-regular ethertype cannot use the fastpath */ 2988 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2989 IEEE80211_FCTL_TODS); 2990 /* RA TA DA SA */ 2991 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2992 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2993 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2994 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2995 build.hdr_len = 30; 2996 break; 2997 } 2998 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2999 /* BSSID SA DA */ 3000 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 3001 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3002 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3003 build.hdr_len = 24; 3004 break; 3005 case NL80211_IFTYPE_AP_VLAN: 3006 if (sdata->wdev.use_4addr) { 3007 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3008 IEEE80211_FCTL_TODS); 3009 /* RA TA DA SA */ 3010 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3011 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3012 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3013 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3014 build.hdr_len = 30; 3015 break; 3016 } 3017 fallthrough; 3018 case NL80211_IFTYPE_AP: 3019 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3020 /* DA BSSID SA */ 3021 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3022 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3023 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3024 build.hdr_len = 24; 3025 break; 3026 default: 3027 /* not handled on fast-xmit */ 3028 goto out; 3029 } 3030 3031 if (sta->sta.wme) { 3032 build.hdr_len += 2; 3033 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3034 } 3035 3036 /* We store the key here so there's no point in using rcu_dereference() 3037 * but that's fine because the code that changes the pointers will call 3038 * this function after doing so. For a single CPU that would be enough, 3039 * for multiple see the comment above. 3040 */ 3041 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3042 if (!build.key) 3043 build.key = rcu_access_pointer(sdata->default_unicast_key); 3044 if (build.key) { 3045 bool gen_iv, iv_spc, mmic; 3046 3047 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3048 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3049 mmic = build.key->conf.flags & 3050 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3051 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3052 3053 /* don't handle software crypto */ 3054 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3055 goto out; 3056 3057 /* Key is being removed */ 3058 if (build.key->flags & KEY_FLAG_TAINTED) 3059 goto out; 3060 3061 switch (build.key->conf.cipher) { 3062 case WLAN_CIPHER_SUITE_CCMP: 3063 case WLAN_CIPHER_SUITE_CCMP_256: 3064 if (gen_iv) 3065 build.pn_offs = build.hdr_len; 3066 if (gen_iv || iv_spc) 3067 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3068 break; 3069 case WLAN_CIPHER_SUITE_GCMP: 3070 case WLAN_CIPHER_SUITE_GCMP_256: 3071 if (gen_iv) 3072 build.pn_offs = build.hdr_len; 3073 if (gen_iv || iv_spc) 3074 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3075 break; 3076 case WLAN_CIPHER_SUITE_TKIP: 3077 /* cannot handle MMIC or IV generation in xmit-fast */ 3078 if (mmic || gen_iv) 3079 goto out; 3080 if (iv_spc) 3081 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3082 break; 3083 case WLAN_CIPHER_SUITE_WEP40: 3084 case WLAN_CIPHER_SUITE_WEP104: 3085 /* cannot handle IV generation in fast-xmit */ 3086 if (gen_iv) 3087 goto out; 3088 if (iv_spc) 3089 build.hdr_len += IEEE80211_WEP_IV_LEN; 3090 break; 3091 case WLAN_CIPHER_SUITE_AES_CMAC: 3092 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3093 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3094 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3095 WARN(1, 3096 "management cipher suite 0x%x enabled for data\n", 3097 build.key->conf.cipher); 3098 goto out; 3099 default: 3100 /* we don't know how to generate IVs for this at all */ 3101 if (WARN_ON(gen_iv)) 3102 goto out; 3103 /* pure hardware keys are OK, of course */ 3104 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3105 break; 3106 /* cipher scheme might require space allocation */ 3107 if (iv_spc && 3108 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3109 goto out; 3110 if (iv_spc) 3111 build.hdr_len += build.key->conf.iv_len; 3112 } 3113 3114 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3115 } 3116 3117 hdr->frame_control = fc; 3118 3119 memcpy(build.hdr + build.hdr_len, 3120 rfc1042_header, sizeof(rfc1042_header)); 3121 build.hdr_len += sizeof(rfc1042_header); 3122 3123 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3124 /* if the kmemdup fails, continue w/o fast_tx */ 3125 if (!fast_tx) 3126 goto out; 3127 3128 out: 3129 /* we might have raced against another call to this function */ 3130 old = rcu_dereference_protected(sta->fast_tx, 3131 lockdep_is_held(&sta->lock)); 3132 rcu_assign_pointer(sta->fast_tx, fast_tx); 3133 if (old) 3134 kfree_rcu(old, rcu_head); 3135 spin_unlock_bh(&sta->lock); 3136 } 3137 3138 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3139 { 3140 struct sta_info *sta; 3141 3142 rcu_read_lock(); 3143 list_for_each_entry_rcu(sta, &local->sta_list, list) 3144 ieee80211_check_fast_xmit(sta); 3145 rcu_read_unlock(); 3146 } 3147 3148 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3149 { 3150 struct ieee80211_local *local = sdata->local; 3151 struct sta_info *sta; 3152 3153 rcu_read_lock(); 3154 3155 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3156 if (sdata != sta->sdata && 3157 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3158 continue; 3159 ieee80211_check_fast_xmit(sta); 3160 } 3161 3162 rcu_read_unlock(); 3163 } 3164 3165 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3166 { 3167 struct ieee80211_fast_tx *fast_tx; 3168 3169 spin_lock_bh(&sta->lock); 3170 fast_tx = rcu_dereference_protected(sta->fast_tx, 3171 lockdep_is_held(&sta->lock)); 3172 RCU_INIT_POINTER(sta->fast_tx, NULL); 3173 spin_unlock_bh(&sta->lock); 3174 3175 if (fast_tx) 3176 kfree_rcu(fast_tx, rcu_head); 3177 } 3178 3179 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3180 struct sk_buff *skb, int headroom) 3181 { 3182 if (skb_headroom(skb) < headroom) { 3183 I802_DEBUG_INC(local->tx_expand_skb_head); 3184 3185 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3186 wiphy_debug(local->hw.wiphy, 3187 "failed to reallocate TX buffer\n"); 3188 return false; 3189 } 3190 } 3191 3192 return true; 3193 } 3194 3195 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3196 struct ieee80211_fast_tx *fast_tx, 3197 struct sk_buff *skb) 3198 { 3199 struct ieee80211_local *local = sdata->local; 3200 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3201 struct ieee80211_hdr *hdr; 3202 struct ethhdr *amsdu_hdr; 3203 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3204 int subframe_len = skb->len - hdr_len; 3205 void *data; 3206 u8 *qc, *h_80211_src, *h_80211_dst; 3207 const u8 *bssid; 3208 3209 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3210 return false; 3211 3212 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3213 return true; 3214 3215 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3216 return false; 3217 3218 data = skb_push(skb, sizeof(*amsdu_hdr)); 3219 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3220 hdr = data; 3221 amsdu_hdr = data + hdr_len; 3222 /* h_80211_src/dst is addr* field within hdr */ 3223 h_80211_src = data + fast_tx->sa_offs; 3224 h_80211_dst = data + fast_tx->da_offs; 3225 3226 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3227 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3228 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3229 3230 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3231 * fields needs to be changed to BSSID for A-MSDU frames depending 3232 * on FromDS/ToDS values. 3233 */ 3234 switch (sdata->vif.type) { 3235 case NL80211_IFTYPE_STATION: 3236 bssid = sdata->u.mgd.bssid; 3237 break; 3238 case NL80211_IFTYPE_AP: 3239 case NL80211_IFTYPE_AP_VLAN: 3240 bssid = sdata->vif.addr; 3241 break; 3242 default: 3243 bssid = NULL; 3244 } 3245 3246 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3247 ether_addr_copy(h_80211_src, bssid); 3248 3249 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3250 ether_addr_copy(h_80211_dst, bssid); 3251 3252 qc = ieee80211_get_qos_ctl(hdr); 3253 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3254 3255 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3256 3257 return true; 3258 } 3259 3260 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3261 struct sta_info *sta, 3262 struct ieee80211_fast_tx *fast_tx, 3263 struct sk_buff *skb) 3264 { 3265 struct ieee80211_local *local = sdata->local; 3266 struct fq *fq = &local->fq; 3267 struct fq_tin *tin; 3268 struct fq_flow *flow; 3269 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3270 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3271 struct txq_info *txqi; 3272 struct sk_buff **frag_tail, *head; 3273 int subframe_len = skb->len - ETH_ALEN; 3274 u8 max_subframes = sta->sta.max_amsdu_subframes; 3275 int max_frags = local->hw.max_tx_fragments; 3276 int max_amsdu_len = sta->sta.max_amsdu_len; 3277 int orig_truesize; 3278 u32 flow_idx; 3279 __be16 len; 3280 void *data; 3281 bool ret = false; 3282 unsigned int orig_len; 3283 int n = 2, nfrags, pad = 0; 3284 u16 hdrlen; 3285 3286 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3287 return false; 3288 3289 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3290 return false; 3291 3292 if (skb_is_gso(skb)) 3293 return false; 3294 3295 if (!txq) 3296 return false; 3297 3298 txqi = to_txq_info(txq); 3299 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3300 return false; 3301 3302 if (sta->sta.max_rc_amsdu_len) 3303 max_amsdu_len = min_t(int, max_amsdu_len, 3304 sta->sta.max_rc_amsdu_len); 3305 3306 if (sta->sta.max_tid_amsdu_len[tid]) 3307 max_amsdu_len = min_t(int, max_amsdu_len, 3308 sta->sta.max_tid_amsdu_len[tid]); 3309 3310 flow_idx = fq_flow_idx(fq, skb); 3311 3312 spin_lock_bh(&fq->lock); 3313 3314 /* TODO: Ideally aggregation should be done on dequeue to remain 3315 * responsive to environment changes. 3316 */ 3317 3318 tin = &txqi->tin; 3319 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3320 head = skb_peek_tail(&flow->queue); 3321 if (!head || skb_is_gso(head)) 3322 goto out; 3323 3324 orig_truesize = head->truesize; 3325 orig_len = head->len; 3326 3327 if (skb->len + head->len > max_amsdu_len) 3328 goto out; 3329 3330 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3331 nfrags += 1 + skb_shinfo(head)->nr_frags; 3332 frag_tail = &skb_shinfo(head)->frag_list; 3333 while (*frag_tail) { 3334 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3335 frag_tail = &(*frag_tail)->next; 3336 n++; 3337 } 3338 3339 if (max_subframes && n > max_subframes) 3340 goto out; 3341 3342 if (max_frags && nfrags > max_frags) 3343 goto out; 3344 3345 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3346 goto out; 3347 3348 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3349 goto out; 3350 3351 /* 3352 * Pad out the previous subframe to a multiple of 4 by adding the 3353 * padding to the next one, that's being added. Note that head->len 3354 * is the length of the full A-MSDU, but that works since each time 3355 * we add a new subframe we pad out the previous one to a multiple 3356 * of 4 and thus it no longer matters in the next round. 3357 */ 3358 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3359 if ((head->len - hdrlen) & 3) 3360 pad = 4 - ((head->len - hdrlen) & 3); 3361 3362 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3363 2 + pad)) 3364 goto out_recalc; 3365 3366 ret = true; 3367 data = skb_push(skb, ETH_ALEN + 2); 3368 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3369 3370 data += 2 * ETH_ALEN; 3371 len = cpu_to_be16(subframe_len); 3372 memcpy(data, &len, 2); 3373 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3374 3375 memset(skb_push(skb, pad), 0, pad); 3376 3377 head->len += skb->len; 3378 head->data_len += skb->len; 3379 *frag_tail = skb; 3380 3381 out_recalc: 3382 fq->memory_usage += head->truesize - orig_truesize; 3383 if (head->len != orig_len) { 3384 flow->backlog += head->len - orig_len; 3385 tin->backlog_bytes += head->len - orig_len; 3386 } 3387 out: 3388 spin_unlock_bh(&fq->lock); 3389 3390 return ret; 3391 } 3392 3393 /* 3394 * Can be called while the sta lock is held. Anything that can cause packets to 3395 * be generated will cause deadlock! 3396 */ 3397 static ieee80211_tx_result 3398 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3399 struct sta_info *sta, u8 pn_offs, 3400 struct ieee80211_key *key, 3401 struct ieee80211_tx_data *tx) 3402 { 3403 struct sk_buff *skb = tx->skb; 3404 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3405 struct ieee80211_hdr *hdr = (void *)skb->data; 3406 u8 tid = IEEE80211_NUM_TIDS; 3407 3408 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3409 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3410 return TX_DROP; 3411 3412 if (key) 3413 info->control.hw_key = &key->conf; 3414 3415 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3416 3417 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3418 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3419 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3420 } else { 3421 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3422 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3423 sdata->sequence_number += 0x10; 3424 } 3425 3426 if (skb_shinfo(skb)->gso_size) 3427 sta->tx_stats.msdu[tid] += 3428 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3429 else 3430 sta->tx_stats.msdu[tid]++; 3431 3432 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3433 3434 /* statistics normally done by ieee80211_tx_h_stats (but that 3435 * has to consider fragmentation, so is more complex) 3436 */ 3437 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3438 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3439 3440 if (pn_offs) { 3441 u64 pn; 3442 u8 *crypto_hdr = skb->data + pn_offs; 3443 3444 switch (key->conf.cipher) { 3445 case WLAN_CIPHER_SUITE_CCMP: 3446 case WLAN_CIPHER_SUITE_CCMP_256: 3447 case WLAN_CIPHER_SUITE_GCMP: 3448 case WLAN_CIPHER_SUITE_GCMP_256: 3449 pn = atomic64_inc_return(&key->conf.tx_pn); 3450 crypto_hdr[0] = pn; 3451 crypto_hdr[1] = pn >> 8; 3452 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3453 crypto_hdr[4] = pn >> 16; 3454 crypto_hdr[5] = pn >> 24; 3455 crypto_hdr[6] = pn >> 32; 3456 crypto_hdr[7] = pn >> 40; 3457 break; 3458 } 3459 } 3460 3461 return TX_CONTINUE; 3462 } 3463 3464 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3465 struct sta_info *sta, 3466 struct ieee80211_fast_tx *fast_tx, 3467 struct sk_buff *skb) 3468 { 3469 struct ieee80211_local *local = sdata->local; 3470 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3471 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3472 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3473 struct ethhdr eth; 3474 struct ieee80211_tx_info *info; 3475 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3476 struct ieee80211_tx_data tx; 3477 ieee80211_tx_result r; 3478 struct tid_ampdu_tx *tid_tx = NULL; 3479 u8 tid = IEEE80211_NUM_TIDS; 3480 3481 /* control port protocol needs a lot of special handling */ 3482 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3483 return false; 3484 3485 /* only RFC 1042 SNAP */ 3486 if (ethertype < ETH_P_802_3_MIN) 3487 return false; 3488 3489 /* don't handle TX status request here either */ 3490 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3491 return false; 3492 3493 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3494 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3495 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3496 if (tid_tx) { 3497 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3498 return false; 3499 if (tid_tx->timeout) 3500 tid_tx->last_tx = jiffies; 3501 } 3502 } 3503 3504 /* after this point (skb is modified) we cannot return false */ 3505 3506 if (skb_shared(skb)) { 3507 struct sk_buff *tmp_skb = skb; 3508 3509 skb = skb_clone(skb, GFP_ATOMIC); 3510 kfree_skb(tmp_skb); 3511 3512 if (!skb) 3513 return true; 3514 } 3515 3516 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3517 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3518 return true; 3519 3520 /* will not be crypto-handled beyond what we do here, so use false 3521 * as the may-encrypt argument for the resize to not account for 3522 * more room than we already have in 'extra_head' 3523 */ 3524 if (unlikely(ieee80211_skb_resize(sdata, skb, 3525 max_t(int, extra_head + hw_headroom - 3526 skb_headroom(skb), 0), 3527 ENCRYPT_NO))) { 3528 kfree_skb(skb); 3529 return true; 3530 } 3531 3532 memcpy(ð, skb->data, ETH_HLEN - 2); 3533 hdr = skb_push(skb, extra_head); 3534 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3535 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3536 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3537 3538 info = IEEE80211_SKB_CB(skb); 3539 memset(info, 0, sizeof(*info)); 3540 info->band = fast_tx->band; 3541 info->control.vif = &sdata->vif; 3542 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3543 IEEE80211_TX_CTL_DONTFRAG | 3544 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3545 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3546 3547 #ifdef CONFIG_MAC80211_DEBUGFS 3548 if (local->force_tx_status) 3549 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3550 #endif 3551 3552 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3553 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3554 *ieee80211_get_qos_ctl(hdr) = tid; 3555 } 3556 3557 __skb_queue_head_init(&tx.skbs); 3558 3559 tx.flags = IEEE80211_TX_UNICAST; 3560 tx.local = local; 3561 tx.sdata = sdata; 3562 tx.sta = sta; 3563 tx.key = fast_tx->key; 3564 3565 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3566 return true; 3567 3568 tx.skb = skb; 3569 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3570 fast_tx->key, &tx); 3571 tx.skb = NULL; 3572 if (r == TX_DROP) { 3573 kfree_skb(skb); 3574 return true; 3575 } 3576 3577 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3578 sdata = container_of(sdata->bss, 3579 struct ieee80211_sub_if_data, u.ap); 3580 3581 __skb_queue_tail(&tx.skbs, skb); 3582 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3583 return true; 3584 } 3585 3586 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3587 struct ieee80211_txq *txq) 3588 { 3589 struct ieee80211_local *local = hw_to_local(hw); 3590 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3591 struct ieee80211_hdr *hdr; 3592 struct sk_buff *skb = NULL; 3593 struct fq *fq = &local->fq; 3594 struct fq_tin *tin = &txqi->tin; 3595 struct ieee80211_tx_info *info; 3596 struct ieee80211_tx_data tx; 3597 ieee80211_tx_result r; 3598 struct ieee80211_vif *vif = txq->vif; 3599 3600 WARN_ON_ONCE(softirq_count() == 0); 3601 3602 if (!ieee80211_txq_airtime_check(hw, txq)) 3603 return NULL; 3604 3605 begin: 3606 spin_lock_bh(&fq->lock); 3607 3608 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3609 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3610 goto out; 3611 3612 if (vif->txqs_stopped[txq->ac]) { 3613 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3614 goto out; 3615 } 3616 3617 /* Make sure fragments stay together. */ 3618 skb = __skb_dequeue(&txqi->frags); 3619 if (unlikely(skb)) { 3620 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3621 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3622 goto out; 3623 IEEE80211_SKB_CB(skb)->control.flags &= 3624 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3625 } else { 3626 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3627 } 3628 3629 if (!skb) 3630 goto out; 3631 3632 spin_unlock_bh(&fq->lock); 3633 3634 hdr = (struct ieee80211_hdr *)skb->data; 3635 info = IEEE80211_SKB_CB(skb); 3636 3637 memset(&tx, 0, sizeof(tx)); 3638 __skb_queue_head_init(&tx.skbs); 3639 tx.local = local; 3640 tx.skb = skb; 3641 tx.sdata = vif_to_sdata(info->control.vif); 3642 3643 if (txq->sta) { 3644 tx.sta = container_of(txq->sta, struct sta_info, sta); 3645 /* 3646 * Drop unicast frames to unauthorised stations unless they are 3647 * injected frames or EAPOL frames from the local station. 3648 */ 3649 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3650 ieee80211_is_data(hdr->frame_control) && 3651 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3652 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3653 !is_multicast_ether_addr(hdr->addr1) && 3654 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3655 (!(info->control.flags & 3656 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3657 !ether_addr_equal(tx.sdata->vif.addr, 3658 hdr->addr2)))) { 3659 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3660 ieee80211_free_txskb(&local->hw, skb); 3661 goto begin; 3662 } 3663 } 3664 3665 /* 3666 * The key can be removed while the packet was queued, so need to call 3667 * this here to get the current key. 3668 */ 3669 r = ieee80211_tx_h_select_key(&tx); 3670 if (r != TX_CONTINUE) { 3671 ieee80211_free_txskb(&local->hw, skb); 3672 goto begin; 3673 } 3674 3675 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3676 info->flags |= IEEE80211_TX_CTL_AMPDU; 3677 else 3678 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3679 3680 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3681 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3682 r = ieee80211_tx_h_rate_ctrl(&tx); 3683 if (r != TX_CONTINUE) { 3684 ieee80211_free_txskb(&local->hw, skb); 3685 goto begin; 3686 } 3687 } 3688 goto encap_out; 3689 } 3690 3691 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3692 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3693 sta); 3694 u8 pn_offs = 0; 3695 3696 if (tx.key && 3697 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3698 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3699 3700 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3701 tx.key, &tx); 3702 if (r != TX_CONTINUE) { 3703 ieee80211_free_txskb(&local->hw, skb); 3704 goto begin; 3705 } 3706 } else { 3707 if (invoke_tx_handlers_late(&tx)) 3708 goto begin; 3709 3710 skb = __skb_dequeue(&tx.skbs); 3711 3712 if (!skb_queue_empty(&tx.skbs)) { 3713 spin_lock_bh(&fq->lock); 3714 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3715 spin_unlock_bh(&fq->lock); 3716 } 3717 } 3718 3719 if (skb_has_frag_list(skb) && 3720 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3721 if (skb_linearize(skb)) { 3722 ieee80211_free_txskb(&local->hw, skb); 3723 goto begin; 3724 } 3725 } 3726 3727 switch (tx.sdata->vif.type) { 3728 case NL80211_IFTYPE_MONITOR: 3729 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3730 vif = &tx.sdata->vif; 3731 break; 3732 } 3733 tx.sdata = rcu_dereference(local->monitor_sdata); 3734 if (tx.sdata) { 3735 vif = &tx.sdata->vif; 3736 info->hw_queue = 3737 vif->hw_queue[skb_get_queue_mapping(skb)]; 3738 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3739 ieee80211_free_txskb(&local->hw, skb); 3740 goto begin; 3741 } else { 3742 vif = NULL; 3743 } 3744 break; 3745 case NL80211_IFTYPE_AP_VLAN: 3746 tx.sdata = container_of(tx.sdata->bss, 3747 struct ieee80211_sub_if_data, u.ap); 3748 fallthrough; 3749 default: 3750 vif = &tx.sdata->vif; 3751 break; 3752 } 3753 3754 encap_out: 3755 IEEE80211_SKB_CB(skb)->control.vif = vif; 3756 3757 if (vif && 3758 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3759 bool ampdu = txq->ac != IEEE80211_AC_VO; 3760 u32 airtime; 3761 3762 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3763 skb->len, ampdu); 3764 if (airtime) { 3765 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3766 ieee80211_sta_update_pending_airtime(local, tx.sta, 3767 txq->ac, 3768 airtime, 3769 false); 3770 } 3771 } 3772 3773 return skb; 3774 3775 out: 3776 spin_unlock_bh(&fq->lock); 3777 3778 return skb; 3779 } 3780 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3781 3782 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3783 { 3784 struct ieee80211_local *local = hw_to_local(hw); 3785 struct airtime_sched_info *air_sched; 3786 u64 now = ktime_get_boottime_ns(); 3787 struct ieee80211_txq *ret = NULL; 3788 struct airtime_info *air_info; 3789 struct txq_info *txqi = NULL; 3790 struct rb_node *node; 3791 bool first = false; 3792 3793 air_sched = &local->airtime[ac]; 3794 spin_lock_bh(&air_sched->lock); 3795 3796 node = air_sched->schedule_pos; 3797 3798 begin: 3799 if (!node) { 3800 node = rb_first_cached(&air_sched->active_txqs); 3801 first = true; 3802 } else { 3803 node = rb_next(node); 3804 } 3805 3806 if (!node) 3807 goto out; 3808 3809 txqi = container_of(node, struct txq_info, schedule_order); 3810 air_info = to_airtime_info(&txqi->txq); 3811 3812 if (air_info->v_t > air_sched->v_t && 3813 (!first || !airtime_catchup_v_t(air_sched, air_info->v_t, now))) 3814 goto out; 3815 3816 if (!ieee80211_txq_airtime_check(hw, &txqi->txq)) { 3817 first = false; 3818 goto begin; 3819 } 3820 3821 air_sched->schedule_pos = node; 3822 air_sched->last_schedule_activity = now; 3823 ret = &txqi->txq; 3824 out: 3825 spin_unlock_bh(&air_sched->lock); 3826 return ret; 3827 } 3828 EXPORT_SYMBOL(ieee80211_next_txq); 3829 3830 static void __ieee80211_insert_txq(struct rb_root_cached *root, 3831 struct txq_info *txqi) 3832 { 3833 struct rb_node **new = &root->rb_root.rb_node; 3834 struct airtime_info *old_air, *new_air; 3835 struct rb_node *parent = NULL; 3836 struct txq_info *__txqi; 3837 bool leftmost = true; 3838 3839 while (*new) { 3840 parent = *new; 3841 __txqi = rb_entry(parent, struct txq_info, schedule_order); 3842 old_air = to_airtime_info(&__txqi->txq); 3843 new_air = to_airtime_info(&txqi->txq); 3844 3845 if (new_air->v_t <= old_air->v_t) { 3846 new = &parent->rb_left; 3847 } else { 3848 new = &parent->rb_right; 3849 leftmost = false; 3850 } 3851 } 3852 3853 rb_link_node(&txqi->schedule_order, parent, new); 3854 rb_insert_color_cached(&txqi->schedule_order, root, leftmost); 3855 } 3856 3857 void ieee80211_resort_txq(struct ieee80211_hw *hw, 3858 struct ieee80211_txq *txq) 3859 { 3860 struct airtime_info *air_info = to_airtime_info(txq); 3861 struct ieee80211_local *local = hw_to_local(hw); 3862 struct txq_info *txqi = to_txq_info(txq); 3863 struct airtime_sched_info *air_sched; 3864 3865 air_sched = &local->airtime[txq->ac]; 3866 3867 lockdep_assert_held(&air_sched->lock); 3868 3869 if (!RB_EMPTY_NODE(&txqi->schedule_order)) { 3870 struct airtime_info *a_prev = NULL, *a_next = NULL; 3871 struct txq_info *t_prev, *t_next; 3872 struct rb_node *n_prev, *n_next; 3873 3874 /* Erasing a node can cause an expensive rebalancing operation, 3875 * so we check the previous and next nodes first and only remove 3876 * and re-insert if the current node is not already in the 3877 * correct position. 3878 */ 3879 if ((n_prev = rb_prev(&txqi->schedule_order)) != NULL) { 3880 t_prev = container_of(n_prev, struct txq_info, 3881 schedule_order); 3882 a_prev = to_airtime_info(&t_prev->txq); 3883 } 3884 3885 if ((n_next = rb_next(&txqi->schedule_order)) != NULL) { 3886 t_next = container_of(n_next, struct txq_info, 3887 schedule_order); 3888 a_next = to_airtime_info(&t_next->txq); 3889 } 3890 3891 if ((!a_prev || a_prev->v_t <= air_info->v_t) && 3892 (!a_next || a_next->v_t > air_info->v_t)) 3893 return; 3894 3895 if (air_sched->schedule_pos == &txqi->schedule_order) 3896 air_sched->schedule_pos = n_prev; 3897 3898 rb_erase_cached(&txqi->schedule_order, 3899 &air_sched->active_txqs); 3900 RB_CLEAR_NODE(&txqi->schedule_order); 3901 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 3902 } 3903 } 3904 3905 void ieee80211_update_airtime_weight(struct ieee80211_local *local, 3906 struct airtime_sched_info *air_sched, 3907 u64 now, bool force) 3908 { 3909 struct airtime_info *air_info, *tmp; 3910 u64 weight_sum = 0; 3911 3912 if (unlikely(!now)) 3913 now = ktime_get_boottime_ns(); 3914 3915 lockdep_assert_held(&air_sched->lock); 3916 3917 if (!force && (air_sched->last_weight_update < 3918 now - AIRTIME_ACTIVE_DURATION)) 3919 return; 3920 3921 list_for_each_entry_safe(air_info, tmp, 3922 &air_sched->active_list, list) { 3923 if (airtime_is_active(air_info, now)) 3924 weight_sum += air_info->weight; 3925 else 3926 list_del_init(&air_info->list); 3927 } 3928 airtime_weight_sum_set(air_sched, weight_sum); 3929 air_sched->last_weight_update = now; 3930 } 3931 3932 void ieee80211_schedule_txq(struct ieee80211_hw *hw, 3933 struct ieee80211_txq *txq) 3934 __acquires(txq_lock) __releases(txq_lock) 3935 { 3936 struct ieee80211_local *local = hw_to_local(hw); 3937 struct txq_info *txqi = to_txq_info(txq); 3938 struct airtime_sched_info *air_sched; 3939 u64 now = ktime_get_boottime_ns(); 3940 struct airtime_info *air_info; 3941 u8 ac = txq->ac; 3942 bool was_active; 3943 3944 air_sched = &local->airtime[ac]; 3945 air_info = to_airtime_info(txq); 3946 3947 spin_lock_bh(&air_sched->lock); 3948 was_active = airtime_is_active(air_info, now); 3949 airtime_set_active(air_sched, air_info, now); 3950 3951 if (!RB_EMPTY_NODE(&txqi->schedule_order)) 3952 goto out; 3953 3954 /* If the station has been inactive for a while, catch up its v_t so it 3955 * doesn't get indefinite priority; see comment above the definition of 3956 * AIRTIME_MAX_BEHIND. 3957 */ 3958 if ((!was_active && air_info->v_t < air_sched->v_t) || 3959 air_info->v_t < air_sched->v_t - AIRTIME_MAX_BEHIND) 3960 air_info->v_t = air_sched->v_t; 3961 3962 ieee80211_update_airtime_weight(local, air_sched, now, !was_active); 3963 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 3964 3965 out: 3966 spin_unlock_bh(&air_sched->lock); 3967 } 3968 EXPORT_SYMBOL(ieee80211_schedule_txq); 3969 3970 static void __ieee80211_unschedule_txq(struct ieee80211_hw *hw, 3971 struct ieee80211_txq *txq, 3972 bool purge) 3973 { 3974 struct ieee80211_local *local = hw_to_local(hw); 3975 struct txq_info *txqi = to_txq_info(txq); 3976 struct airtime_sched_info *air_sched; 3977 struct airtime_info *air_info; 3978 3979 air_sched = &local->airtime[txq->ac]; 3980 air_info = to_airtime_info(&txqi->txq); 3981 3982 lockdep_assert_held(&air_sched->lock); 3983 3984 if (purge) { 3985 list_del_init(&air_info->list); 3986 ieee80211_update_airtime_weight(local, air_sched, 0, true); 3987 } 3988 3989 if (RB_EMPTY_NODE(&txqi->schedule_order)) 3990 return; 3991 3992 if (air_sched->schedule_pos == &txqi->schedule_order) 3993 air_sched->schedule_pos = rb_prev(&txqi->schedule_order); 3994 3995 if (!purge) 3996 airtime_set_active(air_sched, air_info, 3997 ktime_get_boottime_ns()); 3998 3999 rb_erase_cached(&txqi->schedule_order, 4000 &air_sched->active_txqs); 4001 RB_CLEAR_NODE(&txqi->schedule_order); 4002 } 4003 4004 void ieee80211_unschedule_txq(struct ieee80211_hw *hw, 4005 struct ieee80211_txq *txq, 4006 bool purge) 4007 __acquires(txq_lock) __releases(txq_lock) 4008 { 4009 struct ieee80211_local *local = hw_to_local(hw); 4010 4011 spin_lock_bh(&local->airtime[txq->ac].lock); 4012 __ieee80211_unschedule_txq(hw, txq, purge); 4013 spin_unlock_bh(&local->airtime[txq->ac].lock); 4014 } 4015 4016 void ieee80211_return_txq(struct ieee80211_hw *hw, 4017 struct ieee80211_txq *txq, bool force) 4018 { 4019 struct ieee80211_local *local = hw_to_local(hw); 4020 struct txq_info *txqi = to_txq_info(txq); 4021 4022 spin_lock_bh(&local->airtime[txq->ac].lock); 4023 4024 if (!RB_EMPTY_NODE(&txqi->schedule_order) && !force && 4025 !txq_has_queue(txq)) 4026 __ieee80211_unschedule_txq(hw, txq, false); 4027 4028 spin_unlock_bh(&local->airtime[txq->ac].lock); 4029 } 4030 EXPORT_SYMBOL(ieee80211_return_txq); 4031 4032 DEFINE_STATIC_KEY_FALSE(aql_disable); 4033 4034 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4035 struct ieee80211_txq *txq) 4036 { 4037 struct airtime_info *air_info = to_airtime_info(txq); 4038 struct ieee80211_local *local = hw_to_local(hw); 4039 4040 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4041 return true; 4042 4043 if (static_branch_unlikely(&aql_disable)) 4044 return true; 4045 4046 if (!txq->sta) 4047 return true; 4048 4049 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4050 return true; 4051 4052 if (atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_low) 4053 return true; 4054 4055 if (atomic_read(&local->aql_total_pending_airtime) < 4056 local->aql_threshold && 4057 atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_high) 4058 return true; 4059 4060 return false; 4061 } 4062 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4063 4064 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4065 struct ieee80211_txq *txq) 4066 { 4067 struct txq_info *first_txqi = NULL, *txqi = to_txq_info(txq); 4068 struct ieee80211_local *local = hw_to_local(hw); 4069 struct airtime_sched_info *air_sched; 4070 struct airtime_info *air_info; 4071 struct rb_node *node = NULL; 4072 bool ret = false; 4073 u64 now; 4074 4075 4076 if (!ieee80211_txq_airtime_check(hw, txq)) 4077 return false; 4078 4079 air_sched = &local->airtime[txq->ac]; 4080 spin_lock_bh(&air_sched->lock); 4081 4082 if (RB_EMPTY_NODE(&txqi->schedule_order)) 4083 goto out; 4084 4085 now = ktime_get_boottime_ns(); 4086 4087 /* Like in ieee80211_next_txq(), make sure the first station in the 4088 * scheduling order is eligible for transmission to avoid starvation. 4089 */ 4090 node = rb_first_cached(&air_sched->active_txqs); 4091 if (node) { 4092 first_txqi = container_of(node, struct txq_info, 4093 schedule_order); 4094 air_info = to_airtime_info(&first_txqi->txq); 4095 4096 if (air_sched->v_t < air_info->v_t) 4097 airtime_catchup_v_t(air_sched, air_info->v_t, now); 4098 } 4099 4100 air_info = to_airtime_info(&txqi->txq); 4101 if (air_info->v_t <= air_sched->v_t) { 4102 air_sched->last_schedule_activity = now; 4103 ret = true; 4104 } 4105 4106 out: 4107 spin_unlock_bh(&air_sched->lock); 4108 return ret; 4109 } 4110 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4111 4112 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4113 { 4114 struct ieee80211_local *local = hw_to_local(hw); 4115 struct airtime_sched_info *air_sched = &local->airtime[ac]; 4116 4117 spin_lock_bh(&air_sched->lock); 4118 air_sched->schedule_pos = NULL; 4119 spin_unlock_bh(&air_sched->lock); 4120 } 4121 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4122 4123 static void 4124 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 4125 struct sta_info *sta, 4126 struct sk_buff *skb) 4127 { 4128 struct rate_control_ref *ref = sdata->local->rate_ctrl; 4129 u16 tid; 4130 4131 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 4132 return; 4133 4134 if (!sta || !sta->sta.ht_cap.ht_supported || 4135 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 4136 skb->protocol == sdata->control_port_protocol) 4137 return; 4138 4139 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 4140 if (likely(sta->ampdu_mlme.tid_tx[tid])) 4141 return; 4142 4143 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 4144 } 4145 4146 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4147 struct net_device *dev, 4148 u32 info_flags, 4149 u32 ctrl_flags, 4150 u64 *cookie) 4151 { 4152 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4153 struct ieee80211_local *local = sdata->local; 4154 struct sta_info *sta; 4155 struct sk_buff *next; 4156 4157 if (unlikely(skb->len < ETH_HLEN)) { 4158 kfree_skb(skb); 4159 return; 4160 } 4161 4162 rcu_read_lock(); 4163 4164 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4165 goto out_free; 4166 4167 if (IS_ERR(sta)) 4168 sta = NULL; 4169 4170 if (local->ops->wake_tx_queue) { 4171 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4172 skb_set_queue_mapping(skb, queue); 4173 skb_get_hash(skb); 4174 } 4175 4176 ieee80211_aggr_check(sdata, sta, skb); 4177 4178 if (sta) { 4179 struct ieee80211_fast_tx *fast_tx; 4180 4181 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4182 4183 fast_tx = rcu_dereference(sta->fast_tx); 4184 4185 if (fast_tx && 4186 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4187 goto out; 4188 } 4189 4190 if (skb_is_gso(skb)) { 4191 struct sk_buff *segs; 4192 4193 segs = skb_gso_segment(skb, 0); 4194 if (IS_ERR(segs)) { 4195 goto out_free; 4196 } else if (segs) { 4197 consume_skb(skb); 4198 skb = segs; 4199 } 4200 } else { 4201 /* we cannot process non-linear frames on this path */ 4202 if (skb_linearize(skb)) { 4203 kfree_skb(skb); 4204 goto out; 4205 } 4206 4207 /* the frame could be fragmented, software-encrypted, and other 4208 * things so we cannot really handle checksum offload with it - 4209 * fix it up in software before we handle anything else. 4210 */ 4211 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4212 skb_set_transport_header(skb, 4213 skb_checksum_start_offset(skb)); 4214 if (skb_checksum_help(skb)) 4215 goto out_free; 4216 } 4217 } 4218 4219 skb_list_walk_safe(skb, skb, next) { 4220 skb_mark_not_on_list(skb); 4221 4222 if (skb->protocol == sdata->control_port_protocol) 4223 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4224 4225 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4226 sta, ctrl_flags, cookie); 4227 if (IS_ERR(skb)) { 4228 kfree_skb_list(next); 4229 goto out; 4230 } 4231 4232 dev_sw_netstats_tx_add(dev, 1, skb->len); 4233 4234 ieee80211_xmit(sdata, sta, skb); 4235 } 4236 goto out; 4237 out_free: 4238 kfree_skb(skb); 4239 out: 4240 rcu_read_unlock(); 4241 } 4242 4243 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4244 { 4245 struct ethhdr *eth; 4246 int err; 4247 4248 err = skb_ensure_writable(skb, ETH_HLEN); 4249 if (unlikely(err)) 4250 return err; 4251 4252 eth = (void *)skb->data; 4253 ether_addr_copy(eth->h_dest, sta->sta.addr); 4254 4255 return 0; 4256 } 4257 4258 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4259 struct net_device *dev) 4260 { 4261 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4262 const struct ethhdr *eth = (void *)skb->data; 4263 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4264 __be16 ethertype; 4265 4266 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4267 return false; 4268 4269 switch (sdata->vif.type) { 4270 case NL80211_IFTYPE_AP_VLAN: 4271 if (sdata->u.vlan.sta) 4272 return false; 4273 if (sdata->wdev.use_4addr) 4274 return false; 4275 fallthrough; 4276 case NL80211_IFTYPE_AP: 4277 /* check runtime toggle for this bss */ 4278 if (!sdata->bss->multicast_to_unicast) 4279 return false; 4280 break; 4281 default: 4282 return false; 4283 } 4284 4285 /* multicast to unicast conversion only for some payload */ 4286 ethertype = eth->h_proto; 4287 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4288 ethertype = ethvlan->h_vlan_encapsulated_proto; 4289 switch (ethertype) { 4290 case htons(ETH_P_ARP): 4291 case htons(ETH_P_IP): 4292 case htons(ETH_P_IPV6): 4293 break; 4294 default: 4295 return false; 4296 } 4297 4298 return true; 4299 } 4300 4301 static void 4302 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4303 struct sk_buff_head *queue) 4304 { 4305 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4306 struct ieee80211_local *local = sdata->local; 4307 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4308 struct sta_info *sta, *first = NULL; 4309 struct sk_buff *cloned_skb; 4310 4311 rcu_read_lock(); 4312 4313 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4314 if (sdata != sta->sdata) 4315 /* AP-VLAN mismatch */ 4316 continue; 4317 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4318 /* do not send back to source */ 4319 continue; 4320 if (!first) { 4321 first = sta; 4322 continue; 4323 } 4324 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4325 if (!cloned_skb) 4326 goto multicast; 4327 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4328 dev_kfree_skb(cloned_skb); 4329 goto multicast; 4330 } 4331 __skb_queue_tail(queue, cloned_skb); 4332 } 4333 4334 if (likely(first)) { 4335 if (unlikely(ieee80211_change_da(skb, first))) 4336 goto multicast; 4337 __skb_queue_tail(queue, skb); 4338 } else { 4339 /* no STA connected, drop */ 4340 kfree_skb(skb); 4341 skb = NULL; 4342 } 4343 4344 goto out; 4345 multicast: 4346 __skb_queue_purge(queue); 4347 __skb_queue_tail(queue, skb); 4348 out: 4349 rcu_read_unlock(); 4350 } 4351 4352 /** 4353 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4354 * @skb: packet to be sent 4355 * @dev: incoming interface 4356 * 4357 * On failure skb will be freed. 4358 */ 4359 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4360 struct net_device *dev) 4361 { 4362 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4363 struct sk_buff_head queue; 4364 4365 __skb_queue_head_init(&queue); 4366 ieee80211_convert_to_unicast(skb, dev, &queue); 4367 while ((skb = __skb_dequeue(&queue))) 4368 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4369 } else { 4370 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4371 } 4372 4373 return NETDEV_TX_OK; 4374 } 4375 4376 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4377 struct sk_buff *skb, int led_len, 4378 struct sta_info *sta, 4379 bool txpending) 4380 { 4381 struct ieee80211_local *local = sdata->local; 4382 struct ieee80211_tx_control control = {}; 4383 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4384 struct ieee80211_sta *pubsta = NULL; 4385 unsigned long flags; 4386 int q = info->hw_queue; 4387 4388 if (sta) 4389 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4390 4391 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4392 return true; 4393 4394 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4395 4396 if (local->queue_stop_reasons[q] || 4397 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4398 if (txpending) 4399 skb_queue_head(&local->pending[q], skb); 4400 else 4401 skb_queue_tail(&local->pending[q], skb); 4402 4403 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4404 4405 return false; 4406 } 4407 4408 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4409 4410 if (sta && sta->uploaded) 4411 pubsta = &sta->sta; 4412 4413 control.sta = pubsta; 4414 4415 drv_tx(local, &control, skb); 4416 4417 return true; 4418 } 4419 4420 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4421 struct net_device *dev, struct sta_info *sta, 4422 struct ieee80211_key *key, struct sk_buff *skb) 4423 { 4424 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4425 struct ieee80211_local *local = sdata->local; 4426 struct tid_ampdu_tx *tid_tx; 4427 u8 tid; 4428 4429 if (local->ops->wake_tx_queue) { 4430 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4431 skb_set_queue_mapping(skb, queue); 4432 skb_get_hash(skb); 4433 } 4434 4435 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4436 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4437 goto out_free; 4438 4439 memset(info, 0, sizeof(*info)); 4440 4441 ieee80211_aggr_check(sdata, sta, skb); 4442 4443 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4444 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4445 if (tid_tx) { 4446 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4447 /* fall back to non-offload slow path */ 4448 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4449 return; 4450 } 4451 4452 info->flags |= IEEE80211_TX_CTL_AMPDU; 4453 if (tid_tx->timeout) 4454 tid_tx->last_tx = jiffies; 4455 } 4456 4457 if (unlikely(skb->sk && 4458 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4459 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4460 &info->flags, NULL); 4461 4462 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4463 4464 dev_sw_netstats_tx_add(dev, 1, skb->len); 4465 4466 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4467 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4468 4469 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4470 sdata = container_of(sdata->bss, 4471 struct ieee80211_sub_if_data, u.ap); 4472 4473 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4474 info->control.vif = &sdata->vif; 4475 4476 if (key) 4477 info->control.hw_key = &key->conf; 4478 4479 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4480 4481 return; 4482 4483 out_free: 4484 kfree_skb(skb); 4485 } 4486 4487 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4488 struct net_device *dev) 4489 { 4490 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4491 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4492 struct ieee80211_key *key; 4493 struct sta_info *sta; 4494 4495 if (unlikely(skb->len < ETH_HLEN)) { 4496 kfree_skb(skb); 4497 return NETDEV_TX_OK; 4498 } 4499 4500 rcu_read_lock(); 4501 4502 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4503 kfree_skb(skb); 4504 goto out; 4505 } 4506 4507 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4508 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4509 sdata->control_port_protocol == ehdr->h_proto)) 4510 goto skip_offload; 4511 4512 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4513 if (!key) 4514 key = rcu_dereference(sdata->default_unicast_key); 4515 4516 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4517 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4518 goto skip_offload; 4519 4520 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4521 goto out; 4522 4523 skip_offload: 4524 ieee80211_subif_start_xmit(skb, dev); 4525 out: 4526 rcu_read_unlock(); 4527 4528 return NETDEV_TX_OK; 4529 } 4530 4531 struct sk_buff * 4532 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4533 struct sk_buff *skb, u32 info_flags) 4534 { 4535 struct ieee80211_hdr *hdr; 4536 struct ieee80211_tx_data tx = { 4537 .local = sdata->local, 4538 .sdata = sdata, 4539 }; 4540 struct sta_info *sta; 4541 4542 rcu_read_lock(); 4543 4544 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4545 kfree_skb(skb); 4546 skb = ERR_PTR(-EINVAL); 4547 goto out; 4548 } 4549 4550 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4551 if (IS_ERR(skb)) 4552 goto out; 4553 4554 hdr = (void *)skb->data; 4555 tx.sta = sta_info_get(sdata, hdr->addr1); 4556 tx.skb = skb; 4557 4558 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4559 rcu_read_unlock(); 4560 kfree_skb(skb); 4561 return ERR_PTR(-EINVAL); 4562 } 4563 4564 out: 4565 rcu_read_unlock(); 4566 return skb; 4567 } 4568 4569 /* 4570 * ieee80211_clear_tx_pending may not be called in a context where 4571 * it is possible that it packets could come in again. 4572 */ 4573 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4574 { 4575 struct sk_buff *skb; 4576 int i; 4577 4578 for (i = 0; i < local->hw.queues; i++) { 4579 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4580 ieee80211_free_txskb(&local->hw, skb); 4581 } 4582 } 4583 4584 /* 4585 * Returns false if the frame couldn't be transmitted but was queued instead, 4586 * which in this case means re-queued -- take as an indication to stop sending 4587 * more pending frames. 4588 */ 4589 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4590 struct sk_buff *skb) 4591 { 4592 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4593 struct ieee80211_sub_if_data *sdata; 4594 struct sta_info *sta; 4595 struct ieee80211_hdr *hdr; 4596 bool result; 4597 struct ieee80211_chanctx_conf *chanctx_conf; 4598 4599 sdata = vif_to_sdata(info->control.vif); 4600 4601 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4602 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4603 if (unlikely(!chanctx_conf)) { 4604 dev_kfree_skb(skb); 4605 return true; 4606 } 4607 info->band = chanctx_conf->def.chan->band; 4608 result = ieee80211_tx(sdata, NULL, skb, true); 4609 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4610 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4611 dev_kfree_skb(skb); 4612 return true; 4613 } 4614 4615 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4616 sta = NULL; 4617 4618 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4619 } else { 4620 struct sk_buff_head skbs; 4621 4622 __skb_queue_head_init(&skbs); 4623 __skb_queue_tail(&skbs, skb); 4624 4625 hdr = (struct ieee80211_hdr *)skb->data; 4626 sta = sta_info_get(sdata, hdr->addr1); 4627 4628 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4629 } 4630 4631 return result; 4632 } 4633 4634 /* 4635 * Transmit all pending packets. Called from tasklet. 4636 */ 4637 void ieee80211_tx_pending(struct tasklet_struct *t) 4638 { 4639 struct ieee80211_local *local = from_tasklet(local, t, 4640 tx_pending_tasklet); 4641 unsigned long flags; 4642 int i; 4643 bool txok; 4644 4645 rcu_read_lock(); 4646 4647 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4648 for (i = 0; i < local->hw.queues; i++) { 4649 /* 4650 * If queue is stopped by something other than due to pending 4651 * frames, or we have no pending frames, proceed to next queue. 4652 */ 4653 if (local->queue_stop_reasons[i] || 4654 skb_queue_empty(&local->pending[i])) 4655 continue; 4656 4657 while (!skb_queue_empty(&local->pending[i])) { 4658 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4659 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4660 4661 if (WARN_ON(!info->control.vif)) { 4662 ieee80211_free_txskb(&local->hw, skb); 4663 continue; 4664 } 4665 4666 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4667 flags); 4668 4669 txok = ieee80211_tx_pending_skb(local, skb); 4670 spin_lock_irqsave(&local->queue_stop_reason_lock, 4671 flags); 4672 if (!txok) 4673 break; 4674 } 4675 4676 if (skb_queue_empty(&local->pending[i])) 4677 ieee80211_propagate_queue_wake(local, i); 4678 } 4679 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4680 4681 rcu_read_unlock(); 4682 } 4683 4684 /* functions for drivers to get certain frames */ 4685 4686 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4687 struct ps_data *ps, struct sk_buff *skb, 4688 bool is_template) 4689 { 4690 u8 *pos, *tim; 4691 int aid0 = 0; 4692 int i, have_bits = 0, n1, n2; 4693 4694 /* Generate bitmap for TIM only if there are any STAs in power save 4695 * mode. */ 4696 if (atomic_read(&ps->num_sta_ps) > 0) 4697 /* in the hope that this is faster than 4698 * checking byte-for-byte */ 4699 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4700 IEEE80211_MAX_AID+1); 4701 if (!is_template) { 4702 if (ps->dtim_count == 0) 4703 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4704 else 4705 ps->dtim_count--; 4706 } 4707 4708 tim = pos = skb_put(skb, 6); 4709 *pos++ = WLAN_EID_TIM; 4710 *pos++ = 4; 4711 *pos++ = ps->dtim_count; 4712 *pos++ = sdata->vif.bss_conf.dtim_period; 4713 4714 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4715 aid0 = 1; 4716 4717 ps->dtim_bc_mc = aid0 == 1; 4718 4719 if (have_bits) { 4720 /* Find largest even number N1 so that bits numbered 1 through 4721 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4722 * (N2 + 1) x 8 through 2007 are 0. */ 4723 n1 = 0; 4724 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4725 if (ps->tim[i]) { 4726 n1 = i & 0xfe; 4727 break; 4728 } 4729 } 4730 n2 = n1; 4731 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4732 if (ps->tim[i]) { 4733 n2 = i; 4734 break; 4735 } 4736 } 4737 4738 /* Bitmap control */ 4739 *pos++ = n1 | aid0; 4740 /* Part Virt Bitmap */ 4741 skb_put(skb, n2 - n1); 4742 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4743 4744 tim[1] = n2 - n1 + 4; 4745 } else { 4746 *pos++ = aid0; /* Bitmap control */ 4747 *pos++ = 0; /* Part Virt Bitmap */ 4748 } 4749 } 4750 4751 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4752 struct ps_data *ps, struct sk_buff *skb, 4753 bool is_template) 4754 { 4755 struct ieee80211_local *local = sdata->local; 4756 4757 /* 4758 * Not very nice, but we want to allow the driver to call 4759 * ieee80211_beacon_get() as a response to the set_tim() 4760 * callback. That, however, is already invoked under the 4761 * sta_lock to guarantee consistent and race-free update 4762 * of the tim bitmap in mac80211 and the driver. 4763 */ 4764 if (local->tim_in_locked_section) { 4765 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4766 } else { 4767 spin_lock_bh(&local->tim_lock); 4768 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4769 spin_unlock_bh(&local->tim_lock); 4770 } 4771 4772 return 0; 4773 } 4774 4775 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4776 struct beacon_data *beacon) 4777 { 4778 struct probe_resp *resp; 4779 u8 *beacon_data; 4780 size_t beacon_data_len; 4781 int i; 4782 u8 count = beacon->cntdwn_current_counter; 4783 4784 switch (sdata->vif.type) { 4785 case NL80211_IFTYPE_AP: 4786 beacon_data = beacon->tail; 4787 beacon_data_len = beacon->tail_len; 4788 break; 4789 case NL80211_IFTYPE_ADHOC: 4790 beacon_data = beacon->head; 4791 beacon_data_len = beacon->head_len; 4792 break; 4793 case NL80211_IFTYPE_MESH_POINT: 4794 beacon_data = beacon->head; 4795 beacon_data_len = beacon->head_len; 4796 break; 4797 default: 4798 return; 4799 } 4800 4801 rcu_read_lock(); 4802 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4803 resp = rcu_dereference(sdata->u.ap.probe_resp); 4804 4805 if (beacon->cntdwn_counter_offsets[i]) { 4806 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4807 beacon_data_len)) { 4808 rcu_read_unlock(); 4809 return; 4810 } 4811 4812 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4813 } 4814 4815 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4816 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4817 } 4818 rcu_read_unlock(); 4819 } 4820 4821 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4822 { 4823 beacon->cntdwn_current_counter--; 4824 4825 /* the counter should never reach 0 */ 4826 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4827 4828 return beacon->cntdwn_current_counter; 4829 } 4830 4831 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4832 { 4833 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4834 struct beacon_data *beacon = NULL; 4835 u8 count = 0; 4836 4837 rcu_read_lock(); 4838 4839 if (sdata->vif.type == NL80211_IFTYPE_AP) 4840 beacon = rcu_dereference(sdata->u.ap.beacon); 4841 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4842 beacon = rcu_dereference(sdata->u.ibss.presp); 4843 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4844 beacon = rcu_dereference(sdata->u.mesh.beacon); 4845 4846 if (!beacon) 4847 goto unlock; 4848 4849 count = __ieee80211_beacon_update_cntdwn(beacon); 4850 4851 unlock: 4852 rcu_read_unlock(); 4853 return count; 4854 } 4855 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4856 4857 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4858 { 4859 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4860 struct beacon_data *beacon = NULL; 4861 4862 rcu_read_lock(); 4863 4864 if (sdata->vif.type == NL80211_IFTYPE_AP) 4865 beacon = rcu_dereference(sdata->u.ap.beacon); 4866 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4867 beacon = rcu_dereference(sdata->u.ibss.presp); 4868 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4869 beacon = rcu_dereference(sdata->u.mesh.beacon); 4870 4871 if (!beacon) 4872 goto unlock; 4873 4874 if (counter < beacon->cntdwn_current_counter) 4875 beacon->cntdwn_current_counter = counter; 4876 4877 unlock: 4878 rcu_read_unlock(); 4879 } 4880 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4881 4882 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4883 { 4884 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4885 struct beacon_data *beacon = NULL; 4886 u8 *beacon_data; 4887 size_t beacon_data_len; 4888 int ret = false; 4889 4890 if (!ieee80211_sdata_running(sdata)) 4891 return false; 4892 4893 rcu_read_lock(); 4894 if (vif->type == NL80211_IFTYPE_AP) { 4895 struct ieee80211_if_ap *ap = &sdata->u.ap; 4896 4897 beacon = rcu_dereference(ap->beacon); 4898 if (WARN_ON(!beacon || !beacon->tail)) 4899 goto out; 4900 beacon_data = beacon->tail; 4901 beacon_data_len = beacon->tail_len; 4902 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4903 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4904 4905 beacon = rcu_dereference(ifibss->presp); 4906 if (!beacon) 4907 goto out; 4908 4909 beacon_data = beacon->head; 4910 beacon_data_len = beacon->head_len; 4911 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4912 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4913 4914 beacon = rcu_dereference(ifmsh->beacon); 4915 if (!beacon) 4916 goto out; 4917 4918 beacon_data = beacon->head; 4919 beacon_data_len = beacon->head_len; 4920 } else { 4921 WARN_ON(1); 4922 goto out; 4923 } 4924 4925 if (!beacon->cntdwn_counter_offsets[0]) 4926 goto out; 4927 4928 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4929 goto out; 4930 4931 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4932 ret = true; 4933 4934 out: 4935 rcu_read_unlock(); 4936 4937 return ret; 4938 } 4939 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4940 4941 static int ieee80211_beacon_protect(struct sk_buff *skb, 4942 struct ieee80211_local *local, 4943 struct ieee80211_sub_if_data *sdata) 4944 { 4945 ieee80211_tx_result res; 4946 struct ieee80211_tx_data tx; 4947 struct sk_buff *check_skb; 4948 4949 memset(&tx, 0, sizeof(tx)); 4950 tx.key = rcu_dereference(sdata->default_beacon_key); 4951 if (!tx.key) 4952 return 0; 4953 tx.local = local; 4954 tx.sdata = sdata; 4955 __skb_queue_head_init(&tx.skbs); 4956 __skb_queue_tail(&tx.skbs, skb); 4957 res = ieee80211_tx_h_encrypt(&tx); 4958 check_skb = __skb_dequeue(&tx.skbs); 4959 /* we may crash after this, but it'd be a bug in crypto */ 4960 WARN_ON(check_skb != skb); 4961 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4962 return -EINVAL; 4963 4964 return 0; 4965 } 4966 4967 static struct sk_buff * 4968 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4969 struct ieee80211_vif *vif, 4970 struct ieee80211_mutable_offsets *offs, 4971 bool is_template) 4972 { 4973 struct ieee80211_local *local = hw_to_local(hw); 4974 struct beacon_data *beacon = NULL; 4975 struct sk_buff *skb = NULL; 4976 struct ieee80211_tx_info *info; 4977 struct ieee80211_sub_if_data *sdata = NULL; 4978 enum nl80211_band band; 4979 struct ieee80211_tx_rate_control txrc; 4980 struct ieee80211_chanctx_conf *chanctx_conf; 4981 int csa_off_base = 0; 4982 4983 rcu_read_lock(); 4984 4985 sdata = vif_to_sdata(vif); 4986 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4987 4988 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4989 goto out; 4990 4991 if (offs) 4992 memset(offs, 0, sizeof(*offs)); 4993 4994 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4995 struct ieee80211_if_ap *ap = &sdata->u.ap; 4996 4997 beacon = rcu_dereference(ap->beacon); 4998 if (beacon) { 4999 if (beacon->cntdwn_counter_offsets[0]) { 5000 if (!is_template) 5001 ieee80211_beacon_update_cntdwn(vif); 5002 5003 ieee80211_set_beacon_cntdwn(sdata, beacon); 5004 } 5005 5006 /* 5007 * headroom, head length, 5008 * tail length and maximum TIM length 5009 */ 5010 skb = dev_alloc_skb(local->tx_headroom + 5011 beacon->head_len + 5012 beacon->tail_len + 256 + 5013 local->hw.extra_beacon_tailroom); 5014 if (!skb) 5015 goto out; 5016 5017 skb_reserve(skb, local->tx_headroom); 5018 skb_put_data(skb, beacon->head, beacon->head_len); 5019 5020 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 5021 is_template); 5022 5023 if (offs) { 5024 offs->tim_offset = beacon->head_len; 5025 offs->tim_length = skb->len - beacon->head_len; 5026 5027 /* for AP the csa offsets are from tail */ 5028 csa_off_base = skb->len; 5029 } 5030 5031 if (beacon->tail) 5032 skb_put_data(skb, beacon->tail, 5033 beacon->tail_len); 5034 5035 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 5036 goto out; 5037 } else 5038 goto out; 5039 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5040 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5041 struct ieee80211_hdr *hdr; 5042 5043 beacon = rcu_dereference(ifibss->presp); 5044 if (!beacon) 5045 goto out; 5046 5047 if (beacon->cntdwn_counter_offsets[0]) { 5048 if (!is_template) 5049 __ieee80211_beacon_update_cntdwn(beacon); 5050 5051 ieee80211_set_beacon_cntdwn(sdata, beacon); 5052 } 5053 5054 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5055 local->hw.extra_beacon_tailroom); 5056 if (!skb) 5057 goto out; 5058 skb_reserve(skb, local->tx_headroom); 5059 skb_put_data(skb, beacon->head, beacon->head_len); 5060 5061 hdr = (struct ieee80211_hdr *) skb->data; 5062 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5063 IEEE80211_STYPE_BEACON); 5064 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5065 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5066 5067 beacon = rcu_dereference(ifmsh->beacon); 5068 if (!beacon) 5069 goto out; 5070 5071 if (beacon->cntdwn_counter_offsets[0]) { 5072 if (!is_template) 5073 /* TODO: For mesh csa_counter is in TU, so 5074 * decrementing it by one isn't correct, but 5075 * for now we leave it consistent with overall 5076 * mac80211's behavior. 5077 */ 5078 __ieee80211_beacon_update_cntdwn(beacon); 5079 5080 ieee80211_set_beacon_cntdwn(sdata, beacon); 5081 } 5082 5083 if (ifmsh->sync_ops) 5084 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5085 5086 skb = dev_alloc_skb(local->tx_headroom + 5087 beacon->head_len + 5088 256 + /* TIM IE */ 5089 beacon->tail_len + 5090 local->hw.extra_beacon_tailroom); 5091 if (!skb) 5092 goto out; 5093 skb_reserve(skb, local->tx_headroom); 5094 skb_put_data(skb, beacon->head, beacon->head_len); 5095 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 5096 5097 if (offs) { 5098 offs->tim_offset = beacon->head_len; 5099 offs->tim_length = skb->len - beacon->head_len; 5100 } 5101 5102 skb_put_data(skb, beacon->tail, beacon->tail_len); 5103 } else { 5104 WARN_ON(1); 5105 goto out; 5106 } 5107 5108 /* CSA offsets */ 5109 if (offs && beacon) { 5110 int i; 5111 5112 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5113 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5114 5115 if (!csa_off) 5116 continue; 5117 5118 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5119 } 5120 } 5121 5122 band = chanctx_conf->def.chan->band; 5123 5124 info = IEEE80211_SKB_CB(skb); 5125 5126 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5127 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5128 info->band = band; 5129 5130 memset(&txrc, 0, sizeof(txrc)); 5131 txrc.hw = hw; 5132 txrc.sband = local->hw.wiphy->bands[band]; 5133 txrc.bss_conf = &sdata->vif.bss_conf; 5134 txrc.skb = skb; 5135 txrc.reported_rate.idx = -1; 5136 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5137 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5138 else 5139 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5140 txrc.bss = true; 5141 rate_control_get_rate(sdata, NULL, &txrc); 5142 5143 info->control.vif = vif; 5144 5145 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5146 IEEE80211_TX_CTL_ASSIGN_SEQ | 5147 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5148 out: 5149 rcu_read_unlock(); 5150 return skb; 5151 5152 } 5153 5154 struct sk_buff * 5155 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5156 struct ieee80211_vif *vif, 5157 struct ieee80211_mutable_offsets *offs) 5158 { 5159 return __ieee80211_beacon_get(hw, vif, offs, true); 5160 } 5161 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5162 5163 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5164 struct ieee80211_vif *vif, 5165 u16 *tim_offset, u16 *tim_length) 5166 { 5167 struct ieee80211_mutable_offsets offs = {}; 5168 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 5169 struct sk_buff *copy; 5170 struct ieee80211_supported_band *sband; 5171 int shift; 5172 5173 if (!bcn) 5174 return bcn; 5175 5176 if (tim_offset) 5177 *tim_offset = offs.tim_offset; 5178 5179 if (tim_length) 5180 *tim_length = offs.tim_length; 5181 5182 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5183 !hw_to_local(hw)->monitors) 5184 return bcn; 5185 5186 /* send a copy to monitor interfaces */ 5187 copy = skb_copy(bcn, GFP_ATOMIC); 5188 if (!copy) 5189 return bcn; 5190 5191 shift = ieee80211_vif_get_shift(vif); 5192 sband = ieee80211_get_sband(vif_to_sdata(vif)); 5193 if (!sband) 5194 return bcn; 5195 5196 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 5197 NULL); 5198 5199 return bcn; 5200 } 5201 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5202 5203 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5204 struct ieee80211_vif *vif) 5205 { 5206 struct ieee80211_if_ap *ap = NULL; 5207 struct sk_buff *skb = NULL; 5208 struct probe_resp *presp = NULL; 5209 struct ieee80211_hdr *hdr; 5210 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5211 5212 if (sdata->vif.type != NL80211_IFTYPE_AP) 5213 return NULL; 5214 5215 rcu_read_lock(); 5216 5217 ap = &sdata->u.ap; 5218 presp = rcu_dereference(ap->probe_resp); 5219 if (!presp) 5220 goto out; 5221 5222 skb = dev_alloc_skb(presp->len); 5223 if (!skb) 5224 goto out; 5225 5226 skb_put_data(skb, presp->data, presp->len); 5227 5228 hdr = (struct ieee80211_hdr *) skb->data; 5229 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5230 5231 out: 5232 rcu_read_unlock(); 5233 return skb; 5234 } 5235 EXPORT_SYMBOL(ieee80211_proberesp_get); 5236 5237 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5238 struct ieee80211_vif *vif) 5239 { 5240 struct sk_buff *skb = NULL; 5241 struct fils_discovery_data *tmpl = NULL; 5242 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5243 5244 if (sdata->vif.type != NL80211_IFTYPE_AP) 5245 return NULL; 5246 5247 rcu_read_lock(); 5248 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5249 if (!tmpl) { 5250 rcu_read_unlock(); 5251 return NULL; 5252 } 5253 5254 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5255 if (skb) { 5256 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5257 skb_put_data(skb, tmpl->data, tmpl->len); 5258 } 5259 5260 rcu_read_unlock(); 5261 return skb; 5262 } 5263 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5264 5265 struct sk_buff * 5266 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5267 struct ieee80211_vif *vif) 5268 { 5269 struct sk_buff *skb = NULL; 5270 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5271 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5272 5273 if (sdata->vif.type != NL80211_IFTYPE_AP) 5274 return NULL; 5275 5276 rcu_read_lock(); 5277 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5278 if (!tmpl) { 5279 rcu_read_unlock(); 5280 return NULL; 5281 } 5282 5283 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5284 if (skb) { 5285 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5286 skb_put_data(skb, tmpl->data, tmpl->len); 5287 } 5288 5289 rcu_read_unlock(); 5290 return skb; 5291 } 5292 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5293 5294 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5295 struct ieee80211_vif *vif) 5296 { 5297 struct ieee80211_sub_if_data *sdata; 5298 struct ieee80211_if_managed *ifmgd; 5299 struct ieee80211_pspoll *pspoll; 5300 struct ieee80211_local *local; 5301 struct sk_buff *skb; 5302 5303 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5304 return NULL; 5305 5306 sdata = vif_to_sdata(vif); 5307 ifmgd = &sdata->u.mgd; 5308 local = sdata->local; 5309 5310 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5311 if (!skb) 5312 return NULL; 5313 5314 skb_reserve(skb, local->hw.extra_tx_headroom); 5315 5316 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5317 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5318 IEEE80211_STYPE_PSPOLL); 5319 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5320 5321 /* aid in PS-Poll has its two MSBs each set to 1 */ 5322 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5323 5324 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5325 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5326 5327 return skb; 5328 } 5329 EXPORT_SYMBOL(ieee80211_pspoll_get); 5330 5331 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5332 struct ieee80211_vif *vif, 5333 bool qos_ok) 5334 { 5335 struct ieee80211_hdr_3addr *nullfunc; 5336 struct ieee80211_sub_if_data *sdata; 5337 struct ieee80211_if_managed *ifmgd; 5338 struct ieee80211_local *local; 5339 struct sk_buff *skb; 5340 bool qos = false; 5341 5342 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5343 return NULL; 5344 5345 sdata = vif_to_sdata(vif); 5346 ifmgd = &sdata->u.mgd; 5347 local = sdata->local; 5348 5349 if (qos_ok) { 5350 struct sta_info *sta; 5351 5352 rcu_read_lock(); 5353 sta = sta_info_get(sdata, ifmgd->bssid); 5354 qos = sta && sta->sta.wme; 5355 rcu_read_unlock(); 5356 } 5357 5358 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5359 sizeof(*nullfunc) + 2); 5360 if (!skb) 5361 return NULL; 5362 5363 skb_reserve(skb, local->hw.extra_tx_headroom); 5364 5365 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5366 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5367 IEEE80211_STYPE_NULLFUNC | 5368 IEEE80211_FCTL_TODS); 5369 if (qos) { 5370 __le16 qoshdr = cpu_to_le16(7); 5371 5372 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5373 IEEE80211_STYPE_NULLFUNC) != 5374 IEEE80211_STYPE_QOS_NULLFUNC); 5375 nullfunc->frame_control |= 5376 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5377 skb->priority = 7; 5378 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5379 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5380 } 5381 5382 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5383 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5384 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5385 5386 return skb; 5387 } 5388 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5389 5390 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5391 const u8 *src_addr, 5392 const u8 *ssid, size_t ssid_len, 5393 size_t tailroom) 5394 { 5395 struct ieee80211_local *local = hw_to_local(hw); 5396 struct ieee80211_hdr_3addr *hdr; 5397 struct sk_buff *skb; 5398 size_t ie_ssid_len; 5399 u8 *pos; 5400 5401 ie_ssid_len = 2 + ssid_len; 5402 5403 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5404 ie_ssid_len + tailroom); 5405 if (!skb) 5406 return NULL; 5407 5408 skb_reserve(skb, local->hw.extra_tx_headroom); 5409 5410 hdr = skb_put_zero(skb, sizeof(*hdr)); 5411 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5412 IEEE80211_STYPE_PROBE_REQ); 5413 eth_broadcast_addr(hdr->addr1); 5414 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5415 eth_broadcast_addr(hdr->addr3); 5416 5417 pos = skb_put(skb, ie_ssid_len); 5418 *pos++ = WLAN_EID_SSID; 5419 *pos++ = ssid_len; 5420 if (ssid_len) 5421 memcpy(pos, ssid, ssid_len); 5422 pos += ssid_len; 5423 5424 return skb; 5425 } 5426 EXPORT_SYMBOL(ieee80211_probereq_get); 5427 5428 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5429 const void *frame, size_t frame_len, 5430 const struct ieee80211_tx_info *frame_txctl, 5431 struct ieee80211_rts *rts) 5432 { 5433 const struct ieee80211_hdr *hdr = frame; 5434 5435 rts->frame_control = 5436 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5437 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5438 frame_txctl); 5439 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5440 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5441 } 5442 EXPORT_SYMBOL(ieee80211_rts_get); 5443 5444 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5445 const void *frame, size_t frame_len, 5446 const struct ieee80211_tx_info *frame_txctl, 5447 struct ieee80211_cts *cts) 5448 { 5449 const struct ieee80211_hdr *hdr = frame; 5450 5451 cts->frame_control = 5452 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5453 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5454 frame_len, frame_txctl); 5455 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5456 } 5457 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5458 5459 struct sk_buff * 5460 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5461 struct ieee80211_vif *vif) 5462 { 5463 struct ieee80211_local *local = hw_to_local(hw); 5464 struct sk_buff *skb = NULL; 5465 struct ieee80211_tx_data tx; 5466 struct ieee80211_sub_if_data *sdata; 5467 struct ps_data *ps; 5468 struct ieee80211_tx_info *info; 5469 struct ieee80211_chanctx_conf *chanctx_conf; 5470 5471 sdata = vif_to_sdata(vif); 5472 5473 rcu_read_lock(); 5474 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5475 5476 if (!chanctx_conf) 5477 goto out; 5478 5479 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5480 struct beacon_data *beacon = 5481 rcu_dereference(sdata->u.ap.beacon); 5482 5483 if (!beacon || !beacon->head) 5484 goto out; 5485 5486 ps = &sdata->u.ap.ps; 5487 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5488 ps = &sdata->u.mesh.ps; 5489 } else { 5490 goto out; 5491 } 5492 5493 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5494 goto out; /* send buffered bc/mc only after DTIM beacon */ 5495 5496 while (1) { 5497 skb = skb_dequeue(&ps->bc_buf); 5498 if (!skb) 5499 goto out; 5500 local->total_ps_buffered--; 5501 5502 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5503 struct ieee80211_hdr *hdr = 5504 (struct ieee80211_hdr *) skb->data; 5505 /* more buffered multicast/broadcast frames ==> set 5506 * MoreData flag in IEEE 802.11 header to inform PS 5507 * STAs */ 5508 hdr->frame_control |= 5509 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5510 } 5511 5512 if (sdata->vif.type == NL80211_IFTYPE_AP) 5513 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5514 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5515 break; 5516 ieee80211_free_txskb(hw, skb); 5517 } 5518 5519 info = IEEE80211_SKB_CB(skb); 5520 5521 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5522 info->band = chanctx_conf->def.chan->band; 5523 5524 if (invoke_tx_handlers(&tx)) 5525 skb = NULL; 5526 out: 5527 rcu_read_unlock(); 5528 5529 return skb; 5530 } 5531 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5532 5533 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5534 { 5535 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5536 struct ieee80211_sub_if_data *sdata = sta->sdata; 5537 struct ieee80211_local *local = sdata->local; 5538 int ret; 5539 u32 queues; 5540 5541 lockdep_assert_held(&local->sta_mtx); 5542 5543 /* only some cases are supported right now */ 5544 switch (sdata->vif.type) { 5545 case NL80211_IFTYPE_STATION: 5546 case NL80211_IFTYPE_AP: 5547 case NL80211_IFTYPE_AP_VLAN: 5548 break; 5549 default: 5550 WARN_ON(1); 5551 return -EINVAL; 5552 } 5553 5554 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5555 return -EINVAL; 5556 5557 if (sta->reserved_tid == tid) { 5558 ret = 0; 5559 goto out; 5560 } 5561 5562 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5563 sdata_err(sdata, "TID reservation already active\n"); 5564 ret = -EALREADY; 5565 goto out; 5566 } 5567 5568 ieee80211_stop_vif_queues(sdata->local, sdata, 5569 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5570 5571 synchronize_net(); 5572 5573 /* Tear down BA sessions so we stop aggregating on this TID */ 5574 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5575 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5576 __ieee80211_stop_tx_ba_session(sta, tid, 5577 AGG_STOP_LOCAL_REQUEST); 5578 } 5579 5580 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5581 __ieee80211_flush_queues(local, sdata, queues, false); 5582 5583 sta->reserved_tid = tid; 5584 5585 ieee80211_wake_vif_queues(local, sdata, 5586 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5587 5588 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5589 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5590 5591 ret = 0; 5592 out: 5593 return ret; 5594 } 5595 EXPORT_SYMBOL(ieee80211_reserve_tid); 5596 5597 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5598 { 5599 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5600 struct ieee80211_sub_if_data *sdata = sta->sdata; 5601 5602 lockdep_assert_held(&sdata->local->sta_mtx); 5603 5604 /* only some cases are supported right now */ 5605 switch (sdata->vif.type) { 5606 case NL80211_IFTYPE_STATION: 5607 case NL80211_IFTYPE_AP: 5608 case NL80211_IFTYPE_AP_VLAN: 5609 break; 5610 default: 5611 WARN_ON(1); 5612 return; 5613 } 5614 5615 if (tid != sta->reserved_tid) { 5616 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5617 return; 5618 } 5619 5620 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5621 } 5622 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5623 5624 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5625 struct sk_buff *skb, int tid, 5626 enum nl80211_band band) 5627 { 5628 int ac = ieee80211_ac_from_tid(tid); 5629 5630 skb_reset_mac_header(skb); 5631 skb_set_queue_mapping(skb, ac); 5632 skb->priority = tid; 5633 5634 skb->dev = sdata->dev; 5635 5636 /* 5637 * The other path calling ieee80211_xmit is from the tasklet, 5638 * and while we can handle concurrent transmissions locking 5639 * requirements are that we do not come into tx with bhs on. 5640 */ 5641 local_bh_disable(); 5642 IEEE80211_SKB_CB(skb)->band = band; 5643 ieee80211_xmit(sdata, NULL, skb); 5644 local_bh_enable(); 5645 } 5646 5647 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5648 const u8 *buf, size_t len, 5649 const u8 *dest, __be16 proto, bool unencrypted, 5650 u64 *cookie) 5651 { 5652 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5653 struct ieee80211_local *local = sdata->local; 5654 struct sta_info *sta; 5655 struct sk_buff *skb; 5656 struct ethhdr *ehdr; 5657 u32 ctrl_flags = 0; 5658 u32 flags = 0; 5659 5660 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5661 * or Pre-Authentication 5662 */ 5663 if (proto != sdata->control_port_protocol && 5664 proto != cpu_to_be16(ETH_P_PREAUTH)) 5665 return -EINVAL; 5666 5667 if (proto == sdata->control_port_protocol) 5668 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5669 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5670 5671 if (unencrypted) 5672 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5673 5674 if (cookie) 5675 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5676 5677 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5678 5679 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5680 sizeof(struct ethhdr) + len); 5681 if (!skb) 5682 return -ENOMEM; 5683 5684 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5685 5686 skb_put_data(skb, buf, len); 5687 5688 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5689 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5690 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5691 ehdr->h_proto = proto; 5692 5693 skb->dev = dev; 5694 skb->protocol = proto; 5695 skb_reset_network_header(skb); 5696 skb_reset_mac_header(skb); 5697 5698 /* update QoS header to prioritize control port frames if possible, 5699 * priorization also happens for control port frames send over 5700 * AF_PACKET 5701 */ 5702 rcu_read_lock(); 5703 5704 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5705 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5706 5707 skb_set_queue_mapping(skb, queue); 5708 skb_get_hash(skb); 5709 } 5710 5711 rcu_read_unlock(); 5712 5713 /* mutex lock is only needed for incrementing the cookie counter */ 5714 mutex_lock(&local->mtx); 5715 5716 local_bh_disable(); 5717 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5718 local_bh_enable(); 5719 5720 mutex_unlock(&local->mtx); 5721 5722 return 0; 5723 } 5724 5725 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5726 const u8 *buf, size_t len) 5727 { 5728 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5729 struct ieee80211_local *local = sdata->local; 5730 struct sk_buff *skb; 5731 5732 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5733 30 + /* header size */ 5734 18); /* 11s header size */ 5735 if (!skb) 5736 return -ENOMEM; 5737 5738 skb_reserve(skb, local->hw.extra_tx_headroom); 5739 skb_put_data(skb, buf, len); 5740 5741 skb->dev = dev; 5742 skb->protocol = htons(ETH_P_802_3); 5743 skb_reset_network_header(skb); 5744 skb_reset_mac_header(skb); 5745 5746 local_bh_disable(); 5747 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5748 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5749 NULL); 5750 local_bh_enable(); 5751 5752 return 0; 5753 } 5754