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 <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 42 struct sk_buff *skb, int group_addr, 43 int next_frag_len) 44 { 45 int rate, mrate, erp, dur, i, shift = 0; 46 struct ieee80211_rate *txrate; 47 struct ieee80211_local *local = tx->local; 48 struct ieee80211_supported_band *sband; 49 struct ieee80211_hdr *hdr; 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 51 struct ieee80211_chanctx_conf *chanctx_conf; 52 u32 rate_flags = 0; 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 rcu_read_lock(); 59 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 60 if (chanctx_conf) { 61 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 } 64 rcu_read_unlock(); 65 66 /* uh huh? */ 67 if (WARN_ON_ONCE(tx->rate.idx < 0)) 68 return 0; 69 70 sband = local->hw.wiphy->bands[info->band]; 71 txrate = &sband->bitrates[tx->rate.idx]; 72 73 erp = txrate->flags & IEEE80211_RATE_ERP_G; 74 75 /* device is expected to do this */ 76 if (sband->band == NL80211_BAND_S1GHZ) 77 return 0; 78 79 /* 80 * data and mgmt (except PS Poll): 81 * - during CFP: 32768 82 * - during contention period: 83 * if addr1 is group address: 0 84 * if more fragments = 0 and addr1 is individual address: time to 85 * transmit one ACK plus SIFS 86 * if more fragments = 1 and addr1 is individual address: time to 87 * transmit next fragment plus 2 x ACK plus 3 x SIFS 88 * 89 * IEEE 802.11, 9.6: 90 * - control response frame (CTS or ACK) shall be transmitted using the 91 * same rate as the immediately previous frame in the frame exchange 92 * sequence, if this rate belongs to the PHY mandatory rates, or else 93 * at the highest possible rate belonging to the PHY rates in the 94 * BSSBasicRateSet 95 */ 96 hdr = (struct ieee80211_hdr *)skb->data; 97 if (ieee80211_is_ctl(hdr->frame_control)) { 98 /* TODO: These control frames are not currently sent by 99 * mac80211, but should they be implemented, this function 100 * needs to be updated to support duration field calculation. 101 * 102 * RTS: time needed to transmit pending data/mgmt frame plus 103 * one CTS frame plus one ACK frame plus 3 x SIFS 104 * CTS: duration of immediately previous RTS minus time 105 * required to transmit CTS and its SIFS 106 * ACK: 0 if immediately previous directed data/mgmt had 107 * more=0, with more=1 duration in ACK frame is duration 108 * from previous frame minus time needed to transmit ACK 109 * and its SIFS 110 * PS Poll: BIT(15) | BIT(14) | aid 111 */ 112 return 0; 113 } 114 115 /* data/mgmt */ 116 if (0 /* FIX: data/mgmt during CFP */) 117 return cpu_to_le16(32768); 118 119 if (group_addr) /* Group address as the destination - no ACK */ 120 return 0; 121 122 /* Individual destination address: 123 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 124 * CTS and ACK frames shall be transmitted using the highest rate in 125 * basic rate set that is less than or equal to the rate of the 126 * immediately previous frame and that is using the same modulation 127 * (CCK or OFDM). If no basic rate set matches with these requirements, 128 * the highest mandatory rate of the PHY that is less than or equal to 129 * the rate of the previous frame is used. 130 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 131 */ 132 rate = -1; 133 /* use lowest available if everything fails */ 134 mrate = sband->bitrates[0].bitrate; 135 for (i = 0; i < sband->n_bitrates; i++) { 136 struct ieee80211_rate *r = &sband->bitrates[i]; 137 138 if (r->bitrate > txrate->bitrate) 139 break; 140 141 if ((rate_flags & r->flags) != rate_flags) 142 continue; 143 144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 145 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 146 147 switch (sband->band) { 148 case NL80211_BAND_2GHZ: { 149 u32 flag; 150 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 151 flag = IEEE80211_RATE_MANDATORY_G; 152 else 153 flag = IEEE80211_RATE_MANDATORY_B; 154 if (r->flags & flag) 155 mrate = r->bitrate; 156 break; 157 } 158 case NL80211_BAND_5GHZ: 159 case NL80211_BAND_6GHZ: 160 if (r->flags & IEEE80211_RATE_MANDATORY_A) 161 mrate = r->bitrate; 162 break; 163 case NL80211_BAND_S1GHZ: 164 case NL80211_BAND_60GHZ: 165 /* TODO, for now fall through */ 166 case NUM_NL80211_BANDS: 167 WARN_ON(1); 168 break; 169 } 170 } 171 if (rate == -1) { 172 /* No matching basic rate found; use highest suitable mandatory 173 * PHY rate */ 174 rate = DIV_ROUND_UP(mrate, 1 << shift); 175 } 176 177 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 178 if (ieee80211_is_data_qos(hdr->frame_control) && 179 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 180 dur = 0; 181 else 182 /* Time needed to transmit ACK 183 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 184 * to closest integer */ 185 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 186 tx->sdata->vif.bss_conf.use_short_preamble, 187 shift); 188 189 if (next_frag_len) { 190 /* Frame is fragmented: duration increases with time needed to 191 * transmit next fragment plus ACK and 2 x SIFS. */ 192 dur *= 2; /* ACK + SIFS */ 193 /* next fragment */ 194 dur += ieee80211_frame_duration(sband->band, next_frag_len, 195 txrate->bitrate, erp, 196 tx->sdata->vif.bss_conf.use_short_preamble, 197 shift); 198 } 199 200 return cpu_to_le16(dur); 201 } 202 203 /* tx handlers */ 204 static ieee80211_tx_result debug_noinline 205 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 206 { 207 struct ieee80211_local *local = tx->local; 208 struct ieee80211_if_managed *ifmgd; 209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 210 211 /* driver doesn't support power save */ 212 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 213 return TX_CONTINUE; 214 215 /* hardware does dynamic power save */ 216 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 217 return TX_CONTINUE; 218 219 /* dynamic power save disabled */ 220 if (local->hw.conf.dynamic_ps_timeout <= 0) 221 return TX_CONTINUE; 222 223 /* we are scanning, don't enable power save */ 224 if (local->scanning) 225 return TX_CONTINUE; 226 227 if (!local->ps_sdata) 228 return TX_CONTINUE; 229 230 /* No point if we're going to suspend */ 231 if (local->quiescing) 232 return TX_CONTINUE; 233 234 /* dynamic ps is supported only in managed mode */ 235 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 236 return TX_CONTINUE; 237 238 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 239 return TX_CONTINUE; 240 241 ifmgd = &tx->sdata->u.mgd; 242 243 /* 244 * Don't wakeup from power save if u-apsd is enabled, voip ac has 245 * u-apsd enabled and the frame is in voip class. This effectively 246 * means that even if all access categories have u-apsd enabled, in 247 * practise u-apsd is only used with the voip ac. This is a 248 * workaround for the case when received voip class packets do not 249 * have correct qos tag for some reason, due the network or the 250 * peer application. 251 * 252 * Note: ifmgd->uapsd_queues access is racy here. If the value is 253 * changed via debugfs, user needs to reassociate manually to have 254 * everything in sync. 255 */ 256 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 257 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 258 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 259 return TX_CONTINUE; 260 261 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 262 ieee80211_stop_queues_by_reason(&local->hw, 263 IEEE80211_MAX_QUEUE_MAP, 264 IEEE80211_QUEUE_STOP_REASON_PS, 265 false); 266 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 267 ieee80211_queue_work(&local->hw, 268 &local->dynamic_ps_disable_work); 269 } 270 271 /* Don't restart the timer if we're not disassociated */ 272 if (!ifmgd->associated) 273 return TX_CONTINUE; 274 275 mod_timer(&local->dynamic_ps_timer, jiffies + 276 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 277 278 return TX_CONTINUE; 279 } 280 281 static ieee80211_tx_result debug_noinline 282 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 283 { 284 285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 286 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 287 bool assoc = false; 288 289 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 290 return TX_CONTINUE; 291 292 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 293 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 294 !ieee80211_is_probe_req(hdr->frame_control) && 295 !ieee80211_is_any_nullfunc(hdr->frame_control)) 296 /* 297 * When software scanning only nullfunc frames (to notify 298 * the sleep state to the AP) and probe requests (for the 299 * active scan) are allowed, all other frames should not be 300 * sent and we should not get here, but if we do 301 * nonetheless, drop them to avoid sending them 302 * off-channel. See the link below and 303 * ieee80211_start_scan() for more. 304 * 305 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 306 */ 307 return TX_DROP; 308 309 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 310 return TX_CONTINUE; 311 312 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 313 return TX_CONTINUE; 314 315 if (tx->sta) 316 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 317 318 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 319 if (unlikely(!assoc && 320 ieee80211_is_data(hdr->frame_control))) { 321 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 322 sdata_info(tx->sdata, 323 "dropped data frame to not associated station %pM\n", 324 hdr->addr1); 325 #endif 326 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 327 return TX_DROP; 328 } 329 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 330 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 331 /* 332 * No associated STAs - no need to send multicast 333 * frames. 334 */ 335 return TX_DROP; 336 } 337 338 return TX_CONTINUE; 339 } 340 341 /* This function is called whenever the AP is about to exceed the maximum limit 342 * of buffered frames for power saving STAs. This situation should not really 343 * happen often during normal operation, so dropping the oldest buffered packet 344 * from each queue should be OK to make some room for new frames. */ 345 static void purge_old_ps_buffers(struct ieee80211_local *local) 346 { 347 int total = 0, purged = 0; 348 struct sk_buff *skb; 349 struct ieee80211_sub_if_data *sdata; 350 struct sta_info *sta; 351 352 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 353 struct ps_data *ps; 354 355 if (sdata->vif.type == NL80211_IFTYPE_AP) 356 ps = &sdata->u.ap.ps; 357 else if (ieee80211_vif_is_mesh(&sdata->vif)) 358 ps = &sdata->u.mesh.ps; 359 else 360 continue; 361 362 skb = skb_dequeue(&ps->bc_buf); 363 if (skb) { 364 purged++; 365 ieee80211_free_txskb(&local->hw, skb); 366 } 367 total += skb_queue_len(&ps->bc_buf); 368 } 369 370 /* 371 * Drop one frame from each station from the lowest-priority 372 * AC that has frames at all. 373 */ 374 list_for_each_entry_rcu(sta, &local->sta_list, list) { 375 int ac; 376 377 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 378 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 379 total += skb_queue_len(&sta->ps_tx_buf[ac]); 380 if (skb) { 381 purged++; 382 ieee80211_free_txskb(&local->hw, skb); 383 break; 384 } 385 } 386 } 387 388 local->total_ps_buffered = total; 389 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 390 } 391 392 static ieee80211_tx_result 393 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 394 { 395 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 396 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 397 struct ps_data *ps; 398 399 /* 400 * broadcast/multicast frame 401 * 402 * If any of the associated/peer stations is in power save mode, 403 * the frame is buffered to be sent after DTIM beacon frame. 404 * This is done either by the hardware or us. 405 */ 406 407 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 408 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 409 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 410 if (!tx->sdata->bss) 411 return TX_CONTINUE; 412 413 ps = &tx->sdata->bss->ps; 414 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 415 ps = &tx->sdata->u.mesh.ps; 416 } else { 417 return TX_CONTINUE; 418 } 419 420 421 /* no buffering for ordered frames */ 422 if (ieee80211_has_order(hdr->frame_control)) 423 return TX_CONTINUE; 424 425 if (ieee80211_is_probe_req(hdr->frame_control)) 426 return TX_CONTINUE; 427 428 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 429 info->hw_queue = tx->sdata->vif.cab_queue; 430 431 /* no stations in PS mode and no buffered packets */ 432 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 433 return TX_CONTINUE; 434 435 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 436 437 /* device releases frame after DTIM beacon */ 438 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 439 return TX_CONTINUE; 440 441 /* buffered in mac80211 */ 442 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 443 purge_old_ps_buffers(tx->local); 444 445 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 446 ps_dbg(tx->sdata, 447 "BC TX buffer full - dropping the oldest frame\n"); 448 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 449 } else 450 tx->local->total_ps_buffered++; 451 452 skb_queue_tail(&ps->bc_buf, tx->skb); 453 454 return TX_QUEUED; 455 } 456 457 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 458 struct sk_buff *skb) 459 { 460 if (!ieee80211_is_mgmt(fc)) 461 return 0; 462 463 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 464 return 0; 465 466 if (!ieee80211_is_robust_mgmt_frame(skb)) 467 return 0; 468 469 return 1; 470 } 471 472 static ieee80211_tx_result 473 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 474 { 475 struct sta_info *sta = tx->sta; 476 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 477 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 478 struct ieee80211_local *local = tx->local; 479 480 if (unlikely(!sta)) 481 return TX_CONTINUE; 482 483 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 484 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 485 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 486 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 487 int ac = skb_get_queue_mapping(tx->skb); 488 489 if (ieee80211_is_mgmt(hdr->frame_control) && 490 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 491 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 492 return TX_CONTINUE; 493 } 494 495 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 496 sta->sta.addr, sta->sta.aid, ac); 497 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 498 purge_old_ps_buffers(tx->local); 499 500 /* sync with ieee80211_sta_ps_deliver_wakeup */ 501 spin_lock(&sta->ps_lock); 502 /* 503 * STA woke up the meantime and all the frames on ps_tx_buf have 504 * been queued to pending queue. No reordering can happen, go 505 * ahead and Tx the packet. 506 */ 507 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 508 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 509 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 510 spin_unlock(&sta->ps_lock); 511 return TX_CONTINUE; 512 } 513 514 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 515 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 516 ps_dbg(tx->sdata, 517 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 518 sta->sta.addr, ac); 519 ieee80211_free_txskb(&local->hw, old); 520 } else 521 tx->local->total_ps_buffered++; 522 523 info->control.jiffies = jiffies; 524 info->control.vif = &tx->sdata->vif; 525 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 526 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 527 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 528 spin_unlock(&sta->ps_lock); 529 530 if (!timer_pending(&local->sta_cleanup)) 531 mod_timer(&local->sta_cleanup, 532 round_jiffies(jiffies + 533 STA_INFO_CLEANUP_INTERVAL)); 534 535 /* 536 * We queued up some frames, so the TIM bit might 537 * need to be set, recalculate it. 538 */ 539 sta_info_recalc_tim(sta); 540 541 return TX_QUEUED; 542 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 543 ps_dbg(tx->sdata, 544 "STA %pM in PS mode, but polling/in SP -> send frame\n", 545 sta->sta.addr); 546 } 547 548 return TX_CONTINUE; 549 } 550 551 static ieee80211_tx_result debug_noinline 552 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 553 { 554 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 555 return TX_CONTINUE; 556 557 if (tx->flags & IEEE80211_TX_UNICAST) 558 return ieee80211_tx_h_unicast_ps_buf(tx); 559 else 560 return ieee80211_tx_h_multicast_ps_buf(tx); 561 } 562 563 static ieee80211_tx_result debug_noinline 564 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 565 { 566 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 567 568 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 569 if (tx->sdata->control_port_no_encrypt) 570 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 571 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 572 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 573 } 574 575 return TX_CONTINUE; 576 } 577 578 static ieee80211_tx_result debug_noinline 579 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 580 { 581 struct ieee80211_key *key; 582 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 583 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 584 585 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 586 tx->key = NULL; 587 return TX_CONTINUE; 588 } 589 590 if (tx->sta && 591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 592 tx->key = key; 593 else if (ieee80211_is_group_privacy_action(tx->skb) && 594 (key = rcu_dereference(tx->sdata->default_multicast_key))) 595 tx->key = key; 596 else if (ieee80211_is_mgmt(hdr->frame_control) && 597 is_multicast_ether_addr(hdr->addr1) && 598 ieee80211_is_robust_mgmt_frame(tx->skb) && 599 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 600 tx->key = key; 601 else if (is_multicast_ether_addr(hdr->addr1) && 602 (key = rcu_dereference(tx->sdata->default_multicast_key))) 603 tx->key = key; 604 else if (!is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_unicast_key))) 606 tx->key = key; 607 else 608 tx->key = NULL; 609 610 if (tx->key) { 611 bool skip_hw = false; 612 613 /* TODO: add threshold stuff again */ 614 615 switch (tx->key->conf.cipher) { 616 case WLAN_CIPHER_SUITE_WEP40: 617 case WLAN_CIPHER_SUITE_WEP104: 618 case WLAN_CIPHER_SUITE_TKIP: 619 if (!ieee80211_is_data_present(hdr->frame_control)) 620 tx->key = NULL; 621 break; 622 case WLAN_CIPHER_SUITE_CCMP: 623 case WLAN_CIPHER_SUITE_CCMP_256: 624 case WLAN_CIPHER_SUITE_GCMP: 625 case WLAN_CIPHER_SUITE_GCMP_256: 626 if (!ieee80211_is_data_present(hdr->frame_control) && 627 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 628 tx->skb) && 629 !ieee80211_is_group_privacy_action(tx->skb)) 630 tx->key = NULL; 631 else 632 skip_hw = (tx->key->conf.flags & 633 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 634 ieee80211_is_mgmt(hdr->frame_control); 635 break; 636 case WLAN_CIPHER_SUITE_AES_CMAC: 637 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 638 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 640 if (!ieee80211_is_mgmt(hdr->frame_control)) 641 tx->key = NULL; 642 break; 643 } 644 645 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 646 !ieee80211_is_deauth(hdr->frame_control))) 647 return TX_DROP; 648 649 if (!skip_hw && tx->key && 650 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 651 info->control.hw_key = &tx->key->conf; 652 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 653 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 654 return TX_DROP; 655 } 656 657 return TX_CONTINUE; 658 } 659 660 static ieee80211_tx_result debug_noinline 661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 662 { 663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 664 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 665 struct ieee80211_supported_band *sband; 666 u32 len; 667 struct ieee80211_tx_rate_control txrc; 668 struct ieee80211_sta_rates *ratetbl = NULL; 669 bool assoc = false; 670 671 memset(&txrc, 0, sizeof(txrc)); 672 673 sband = tx->local->hw.wiphy->bands[info->band]; 674 675 len = min_t(u32, tx->skb->len + FCS_LEN, 676 tx->local->hw.wiphy->frag_threshold); 677 678 /* set up the tx rate control struct we give the RC algo */ 679 txrc.hw = &tx->local->hw; 680 txrc.sband = sband; 681 txrc.bss_conf = &tx->sdata->vif.bss_conf; 682 txrc.skb = tx->skb; 683 txrc.reported_rate.idx = -1; 684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 685 686 if (tx->sdata->rc_has_mcs_mask[info->band]) 687 txrc.rate_idx_mcs_mask = 688 tx->sdata->rc_rateidx_mcs_mask[info->band]; 689 690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 693 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 694 695 /* set up RTS protection if desired */ 696 if (len > tx->local->hw.wiphy->rts_threshold) { 697 txrc.rts = true; 698 } 699 700 info->control.use_rts = txrc.rts; 701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 702 703 /* 704 * Use short preamble if the BSS can handle it, but not for 705 * management frames unless we know the receiver can handle 706 * that -- the management frame might be to a station that 707 * just wants a probe response. 708 */ 709 if (tx->sdata->vif.bss_conf.use_short_preamble && 710 (ieee80211_is_data(hdr->frame_control) || 711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 712 txrc.short_preamble = true; 713 714 info->control.short_preamble = txrc.short_preamble; 715 716 /* don't ask rate control when rate already injected via radiotap */ 717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 718 return TX_CONTINUE; 719 720 if (tx->sta) 721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 722 723 /* 724 * Lets not bother rate control if we're associated and cannot 725 * talk to the sta. This should not happen. 726 */ 727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 728 !rate_usable_index_exists(sband, &tx->sta->sta), 729 "%s: Dropped data frame as no usable bitrate found while " 730 "scanning and associated. Target station: " 731 "%pM on %d GHz band\n", 732 tx->sdata->name, hdr->addr1, 733 info->band ? 5 : 2)) 734 return TX_DROP; 735 736 /* 737 * If we're associated with the sta at this point we know we can at 738 * least send the frame at the lowest bit rate. 739 */ 740 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 741 742 if (tx->sta && !info->control.skip_table) 743 ratetbl = rcu_dereference(tx->sta->sta.rates); 744 745 if (unlikely(info->control.rates[0].idx < 0)) { 746 if (ratetbl) { 747 struct ieee80211_tx_rate rate = { 748 .idx = ratetbl->rate[0].idx, 749 .flags = ratetbl->rate[0].flags, 750 .count = ratetbl->rate[0].count 751 }; 752 753 if (ratetbl->rate[0].idx < 0) 754 return TX_DROP; 755 756 tx->rate = rate; 757 } else { 758 return TX_DROP; 759 } 760 } else { 761 tx->rate = info->control.rates[0]; 762 } 763 764 if (txrc.reported_rate.idx < 0) { 765 txrc.reported_rate = tx->rate; 766 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 767 tx->sta->tx_stats.last_rate = txrc.reported_rate; 768 } else if (tx->sta) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 771 if (ratetbl) 772 return TX_CONTINUE; 773 774 if (unlikely(!info->control.rates[0].count)) 775 info->control.rates[0].count = 1; 776 777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 778 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 779 info->control.rates[0].count = 1; 780 781 return TX_CONTINUE; 782 } 783 784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 785 { 786 u16 *seq = &sta->tid_seq[tid]; 787 __le16 ret = cpu_to_le16(*seq); 788 789 /* Increase the sequence number. */ 790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 791 792 return ret; 793 } 794 795 static ieee80211_tx_result debug_noinline 796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 797 { 798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 800 int tid; 801 802 /* 803 * Packet injection may want to control the sequence 804 * number, if we have no matching interface then we 805 * neither assign one ourselves nor ask the driver to. 806 */ 807 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 808 return TX_CONTINUE; 809 810 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 811 return TX_CONTINUE; 812 813 if (ieee80211_hdrlen(hdr->frame_control) < 24) 814 return TX_CONTINUE; 815 816 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 817 return TX_CONTINUE; 818 819 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 820 return TX_CONTINUE; 821 822 /* 823 * Anything but QoS data that has a sequence number field 824 * (is long enough) gets a sequence number from the global 825 * counter. QoS data frames with a multicast destination 826 * also use the global counter (802.11-2012 9.3.2.10). 827 */ 828 if (!ieee80211_is_data_qos(hdr->frame_control) || 829 is_multicast_ether_addr(hdr->addr1)) { 830 /* driver should assign sequence number */ 831 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 832 /* for pure STA mode without beacons, we can do it */ 833 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 834 tx->sdata->sequence_number += 0x10; 835 if (tx->sta) 836 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 837 return TX_CONTINUE; 838 } 839 840 /* 841 * This should be true for injected/management frames only, for 842 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 843 * above since they are not QoS-data frames. 844 */ 845 if (!tx->sta) 846 return TX_CONTINUE; 847 848 /* include per-STA, per-TID sequence counter */ 849 tid = ieee80211_get_tid(hdr); 850 tx->sta->tx_stats.msdu[tid]++; 851 852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 853 854 return TX_CONTINUE; 855 } 856 857 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 858 struct sk_buff *skb, int hdrlen, 859 int frag_threshold) 860 { 861 struct ieee80211_local *local = tx->local; 862 struct ieee80211_tx_info *info; 863 struct sk_buff *tmp; 864 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 865 int pos = hdrlen + per_fragm; 866 int rem = skb->len - hdrlen - per_fragm; 867 868 if (WARN_ON(rem < 0)) 869 return -EINVAL; 870 871 /* first fragment was already added to queue by caller */ 872 873 while (rem) { 874 int fraglen = per_fragm; 875 876 if (fraglen > rem) 877 fraglen = rem; 878 rem -= fraglen; 879 tmp = dev_alloc_skb(local->tx_headroom + 880 frag_threshold + 881 tx->sdata->encrypt_headroom + 882 IEEE80211_ENCRYPT_TAILROOM); 883 if (!tmp) 884 return -ENOMEM; 885 886 __skb_queue_tail(&tx->skbs, tmp); 887 888 skb_reserve(tmp, 889 local->tx_headroom + tx->sdata->encrypt_headroom); 890 891 /* copy control information */ 892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 893 894 info = IEEE80211_SKB_CB(tmp); 895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 896 IEEE80211_TX_CTL_FIRST_FRAGMENT); 897 898 if (rem) 899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 900 901 skb_copy_queue_mapping(tmp, skb); 902 tmp->priority = skb->priority; 903 tmp->dev = skb->dev; 904 905 /* copy header and data */ 906 skb_put_data(tmp, skb->data, hdrlen); 907 skb_put_data(tmp, skb->data + pos, fraglen); 908 909 pos += fraglen; 910 } 911 912 /* adjust first fragment's length */ 913 skb_trim(skb, hdrlen + per_fragm); 914 return 0; 915 } 916 917 static ieee80211_tx_result debug_noinline 918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 919 { 920 struct sk_buff *skb = tx->skb; 921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 922 struct ieee80211_hdr *hdr = (void *)skb->data; 923 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 924 int hdrlen; 925 int fragnum; 926 927 /* no matter what happens, tx->skb moves to tx->skbs */ 928 __skb_queue_tail(&tx->skbs, skb); 929 tx->skb = NULL; 930 931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 932 return TX_CONTINUE; 933 934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 935 return TX_CONTINUE; 936 937 /* 938 * Warn when submitting a fragmented A-MPDU frame and drop it. 939 * This scenario is handled in ieee80211_tx_prepare but extra 940 * caution taken here as fragmented ampdu may cause Tx stop. 941 */ 942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 943 return TX_DROP; 944 945 hdrlen = ieee80211_hdrlen(hdr->frame_control); 946 947 /* internal error, why isn't DONTFRAG set? */ 948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 949 return TX_DROP; 950 951 /* 952 * Now fragment the frame. This will allocate all the fragments and 953 * chain them (using skb as the first fragment) to skb->next. 954 * During transmission, we will remove the successfully transmitted 955 * fragments from this list. When the low-level driver rejects one 956 * of the fragments then we will simply pretend to accept the skb 957 * but store it away as pending. 958 */ 959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 960 return TX_DROP; 961 962 /* update duration/seq/flags of fragments */ 963 fragnum = 0; 964 965 skb_queue_walk(&tx->skbs, skb) { 966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 967 968 hdr = (void *)skb->data; 969 info = IEEE80211_SKB_CB(skb); 970 971 if (!skb_queue_is_last(&tx->skbs, skb)) { 972 hdr->frame_control |= morefrags; 973 /* 974 * No multi-rate retries for fragmented frames, that 975 * would completely throw off the NAV at other STAs. 976 */ 977 info->control.rates[1].idx = -1; 978 info->control.rates[2].idx = -1; 979 info->control.rates[3].idx = -1; 980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 982 } else { 983 hdr->frame_control &= ~morefrags; 984 } 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 986 fragnum++; 987 } 988 989 return TX_CONTINUE; 990 } 991 992 static ieee80211_tx_result debug_noinline 993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 994 { 995 struct sk_buff *skb; 996 int ac = -1; 997 998 if (!tx->sta) 999 return TX_CONTINUE; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 ac = skb_get_queue_mapping(skb); 1003 tx->sta->tx_stats.bytes[ac] += skb->len; 1004 } 1005 if (ac >= 0) 1006 tx->sta->tx_stats.packets[ac]++; 1007 1008 return TX_CONTINUE; 1009 } 1010 1011 static ieee80211_tx_result debug_noinline 1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1013 { 1014 if (!tx->key) 1015 return TX_CONTINUE; 1016 1017 switch (tx->key->conf.cipher) { 1018 case WLAN_CIPHER_SUITE_WEP40: 1019 case WLAN_CIPHER_SUITE_WEP104: 1020 return ieee80211_crypto_wep_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_TKIP: 1022 return ieee80211_crypto_tkip_encrypt(tx); 1023 case WLAN_CIPHER_SUITE_CCMP: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_CCMP_256: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_256_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_AES_CMAC: 1030 return ieee80211_crypto_aes_cmac_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1035 return ieee80211_crypto_aes_gmac_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_GCMP: 1037 case WLAN_CIPHER_SUITE_GCMP_256: 1038 return ieee80211_crypto_gcmp_encrypt(tx); 1039 default: 1040 return ieee80211_crypto_hw_encrypt(tx); 1041 } 1042 1043 return TX_DROP; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1048 { 1049 struct sk_buff *skb; 1050 struct ieee80211_hdr *hdr; 1051 int next_len; 1052 bool group_addr; 1053 1054 skb_queue_walk(&tx->skbs, skb) { 1055 hdr = (void *) skb->data; 1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1057 break; /* must not overwrite AID */ 1058 if (!skb_queue_is_last(&tx->skbs, skb)) { 1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1060 next_len = next->len; 1061 } else 1062 next_len = 0; 1063 group_addr = is_multicast_ether_addr(hdr->addr1); 1064 1065 hdr->duration_id = 1066 ieee80211_duration(tx, skb, group_addr, next_len); 1067 } 1068 1069 return TX_CONTINUE; 1070 } 1071 1072 /* actual transmit path */ 1073 1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1075 struct sk_buff *skb, 1076 struct ieee80211_tx_info *info, 1077 struct tid_ampdu_tx *tid_tx, 1078 int tid) 1079 { 1080 bool queued = false; 1081 bool reset_agg_timer = false; 1082 struct sk_buff *purge_skb = NULL; 1083 1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1085 info->flags |= IEEE80211_TX_CTL_AMPDU; 1086 reset_agg_timer = true; 1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1088 /* 1089 * nothing -- this aggregation session is being started 1090 * but that might still fail with the driver 1091 */ 1092 } else if (!tx->sta->sta.txq[tid]) { 1093 spin_lock(&tx->sta->lock); 1094 /* 1095 * Need to re-check now, because we may get here 1096 * 1097 * 1) in the window during which the setup is actually 1098 * already done, but not marked yet because not all 1099 * packets are spliced over to the driver pending 1100 * queue yet -- if this happened we acquire the lock 1101 * either before or after the splice happens, but 1102 * need to recheck which of these cases happened. 1103 * 1104 * 2) during session teardown, if the OPERATIONAL bit 1105 * was cleared due to the teardown but the pointer 1106 * hasn't been assigned NULL yet (or we loaded it 1107 * before it was assigned) -- in this case it may 1108 * now be NULL which means we should just let the 1109 * packet pass through because splicing the frames 1110 * back is already done. 1111 */ 1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1113 1114 if (!tid_tx) { 1115 /* do nothing, let packet pass through */ 1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1117 info->flags |= IEEE80211_TX_CTL_AMPDU; 1118 reset_agg_timer = true; 1119 } else { 1120 queued = true; 1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1122 clear_sta_flag(tx->sta, WLAN_STA_SP); 1123 ps_dbg(tx->sta->sdata, 1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1125 tx->sta->sta.addr, tx->sta->sta.aid); 1126 } 1127 info->control.vif = &tx->sdata->vif; 1128 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1130 __skb_queue_tail(&tid_tx->pending, skb); 1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1132 purge_skb = __skb_dequeue(&tid_tx->pending); 1133 } 1134 spin_unlock(&tx->sta->lock); 1135 1136 if (purge_skb) 1137 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1138 } 1139 1140 /* reset session timer */ 1141 if (reset_agg_timer) 1142 tid_tx->last_tx = jiffies; 1143 1144 return queued; 1145 } 1146 1147 /* 1148 * initialises @tx 1149 * pass %NULL for the station if unknown, a valid pointer if known 1150 * or an ERR_PTR() if the station is known not to exist 1151 */ 1152 static ieee80211_tx_result 1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1154 struct ieee80211_tx_data *tx, 1155 struct sta_info *sta, struct sk_buff *skb) 1156 { 1157 struct ieee80211_local *local = sdata->local; 1158 struct ieee80211_hdr *hdr; 1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1160 int tid; 1161 1162 memset(tx, 0, sizeof(*tx)); 1163 tx->skb = skb; 1164 tx->local = local; 1165 tx->sdata = sdata; 1166 __skb_queue_head_init(&tx->skbs); 1167 1168 /* 1169 * If this flag is set to true anywhere, and we get here, 1170 * we are doing the needed processing, so remove the flag 1171 * now. 1172 */ 1173 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1174 1175 hdr = (struct ieee80211_hdr *) skb->data; 1176 1177 if (likely(sta)) { 1178 if (!IS_ERR(sta)) 1179 tx->sta = sta; 1180 } else { 1181 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1182 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1183 if (!tx->sta && sdata->wdev.use_4addr) 1184 return TX_DROP; 1185 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1186 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1187 } 1188 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1189 tx->sta = sta_info_get(sdata, hdr->addr1); 1190 } 1191 1192 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1193 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1194 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1195 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1196 struct tid_ampdu_tx *tid_tx; 1197 1198 tid = ieee80211_get_tid(hdr); 1199 1200 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1201 if (tid_tx) { 1202 bool queued; 1203 1204 queued = ieee80211_tx_prep_agg(tx, skb, info, 1205 tid_tx, tid); 1206 1207 if (unlikely(queued)) 1208 return TX_QUEUED; 1209 } 1210 } 1211 1212 if (is_multicast_ether_addr(hdr->addr1)) { 1213 tx->flags &= ~IEEE80211_TX_UNICAST; 1214 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1215 } else 1216 tx->flags |= IEEE80211_TX_UNICAST; 1217 1218 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1219 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1220 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1221 info->flags & IEEE80211_TX_CTL_AMPDU) 1222 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1223 } 1224 1225 if (!tx->sta) 1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1227 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1229 ieee80211_check_fast_xmit(tx->sta); 1230 } 1231 1232 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1233 1234 return TX_CONTINUE; 1235 } 1236 1237 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1238 struct ieee80211_vif *vif, 1239 struct sta_info *sta, 1240 struct sk_buff *skb) 1241 { 1242 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1243 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1244 struct ieee80211_txq *txq = NULL; 1245 1246 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1247 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1248 return NULL; 1249 1250 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1251 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1252 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1253 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1254 vif->type == NL80211_IFTYPE_STATION) && 1255 sta && sta->uploaded) { 1256 /* 1257 * This will be NULL if the driver didn't set the 1258 * opt-in hardware flag. 1259 */ 1260 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1261 } 1262 } else if (sta) { 1263 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1264 1265 if (!sta->uploaded) 1266 return NULL; 1267 1268 txq = sta->sta.txq[tid]; 1269 } else if (vif) { 1270 txq = vif->txq; 1271 } 1272 1273 if (!txq) 1274 return NULL; 1275 1276 return to_txq_info(txq); 1277 } 1278 1279 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1280 { 1281 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1282 } 1283 1284 static u32 codel_skb_len_func(const struct sk_buff *skb) 1285 { 1286 return skb->len; 1287 } 1288 1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1290 { 1291 const struct ieee80211_tx_info *info; 1292 1293 info = (const struct ieee80211_tx_info *)skb->cb; 1294 return info->control.enqueue_time; 1295 } 1296 1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1298 void *ctx) 1299 { 1300 struct ieee80211_local *local; 1301 struct txq_info *txqi; 1302 struct fq *fq; 1303 struct fq_flow *flow; 1304 1305 txqi = ctx; 1306 local = vif_to_sdata(txqi->txq.vif)->local; 1307 fq = &local->fq; 1308 1309 if (cvars == &txqi->def_cvars) 1310 flow = &txqi->tin.default_flow; 1311 else 1312 flow = &fq->flows[cvars - local->cvars]; 1313 1314 return fq_flow_dequeue(fq, flow); 1315 } 1316 1317 static void codel_drop_func(struct sk_buff *skb, 1318 void *ctx) 1319 { 1320 struct ieee80211_local *local; 1321 struct ieee80211_hw *hw; 1322 struct txq_info *txqi; 1323 1324 txqi = ctx; 1325 local = vif_to_sdata(txqi->txq.vif)->local; 1326 hw = &local->hw; 1327 1328 ieee80211_free_txskb(hw, skb); 1329 } 1330 1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1332 struct fq_tin *tin, 1333 struct fq_flow *flow) 1334 { 1335 struct ieee80211_local *local; 1336 struct txq_info *txqi; 1337 struct codel_vars *cvars; 1338 struct codel_params *cparams; 1339 struct codel_stats *cstats; 1340 1341 local = container_of(fq, struct ieee80211_local, fq); 1342 txqi = container_of(tin, struct txq_info, tin); 1343 cstats = &txqi->cstats; 1344 1345 if (txqi->txq.sta) { 1346 struct sta_info *sta = container_of(txqi->txq.sta, 1347 struct sta_info, sta); 1348 cparams = &sta->cparams; 1349 } else { 1350 cparams = &local->cparams; 1351 } 1352 1353 if (flow == &tin->default_flow) 1354 cvars = &txqi->def_cvars; 1355 else 1356 cvars = &local->cvars[flow - fq->flows]; 1357 1358 return codel_dequeue(txqi, 1359 &flow->backlog, 1360 cparams, 1361 cvars, 1362 cstats, 1363 codel_skb_len_func, 1364 codel_skb_time_func, 1365 codel_drop_func, 1366 codel_dequeue_func); 1367 } 1368 1369 static void fq_skb_free_func(struct fq *fq, 1370 struct fq_tin *tin, 1371 struct fq_flow *flow, 1372 struct sk_buff *skb) 1373 { 1374 struct ieee80211_local *local; 1375 1376 local = container_of(fq, struct ieee80211_local, fq); 1377 ieee80211_free_txskb(&local->hw, skb); 1378 } 1379 1380 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1381 struct txq_info *txqi, 1382 struct sk_buff *skb) 1383 { 1384 struct fq *fq = &local->fq; 1385 struct fq_tin *tin = &txqi->tin; 1386 u32 flow_idx = fq_flow_idx(fq, skb); 1387 1388 ieee80211_set_skb_enqueue_time(skb); 1389 1390 spin_lock_bh(&fq->lock); 1391 /* 1392 * For management frames, don't really apply codel etc., 1393 * we don't want to apply any shaping or anything we just 1394 * want to simplify the driver API by having them on the 1395 * txqi. 1396 */ 1397 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1398 IEEE80211_SKB_CB(skb)->control.flags |= 1399 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1400 __skb_queue_tail(&txqi->frags, skb); 1401 } else { 1402 fq_tin_enqueue(fq, tin, flow_idx, skb, 1403 fq_skb_free_func); 1404 } 1405 spin_unlock_bh(&fq->lock); 1406 } 1407 1408 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1409 struct fq_flow *flow, struct sk_buff *skb, 1410 void *data) 1411 { 1412 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1413 1414 return info->control.vif == data; 1415 } 1416 1417 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1418 struct ieee80211_sub_if_data *sdata) 1419 { 1420 struct fq *fq = &local->fq; 1421 struct txq_info *txqi; 1422 struct fq_tin *tin; 1423 struct ieee80211_sub_if_data *ap; 1424 1425 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1426 return; 1427 1428 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1429 1430 if (!ap->vif.txq) 1431 return; 1432 1433 txqi = to_txq_info(ap->vif.txq); 1434 tin = &txqi->tin; 1435 1436 spin_lock_bh(&fq->lock); 1437 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1438 fq_skb_free_func); 1439 spin_unlock_bh(&fq->lock); 1440 } 1441 1442 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1443 struct sta_info *sta, 1444 struct txq_info *txqi, int tid) 1445 { 1446 fq_tin_init(&txqi->tin); 1447 codel_vars_init(&txqi->def_cvars); 1448 codel_stats_init(&txqi->cstats); 1449 __skb_queue_head_init(&txqi->frags); 1450 INIT_LIST_HEAD(&txqi->schedule_order); 1451 1452 txqi->txq.vif = &sdata->vif; 1453 1454 if (!sta) { 1455 sdata->vif.txq = &txqi->txq; 1456 txqi->txq.tid = 0; 1457 txqi->txq.ac = IEEE80211_AC_BE; 1458 1459 return; 1460 } 1461 1462 if (tid == IEEE80211_NUM_TIDS) { 1463 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1464 /* Drivers need to opt in to the management MPDU TXQ */ 1465 if (!ieee80211_hw_check(&sdata->local->hw, 1466 STA_MMPDU_TXQ)) 1467 return; 1468 } else if (!ieee80211_hw_check(&sdata->local->hw, 1469 BUFF_MMPDU_TXQ)) { 1470 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1471 return; 1472 } 1473 txqi->txq.ac = IEEE80211_AC_VO; 1474 } else { 1475 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1476 } 1477 1478 txqi->txq.sta = &sta->sta; 1479 txqi->txq.tid = tid; 1480 sta->sta.txq[tid] = &txqi->txq; 1481 } 1482 1483 void ieee80211_txq_purge(struct ieee80211_local *local, 1484 struct txq_info *txqi) 1485 { 1486 struct fq *fq = &local->fq; 1487 struct fq_tin *tin = &txqi->tin; 1488 1489 spin_lock_bh(&fq->lock); 1490 fq_tin_reset(fq, tin, fq_skb_free_func); 1491 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1492 spin_unlock_bh(&fq->lock); 1493 1494 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1495 list_del_init(&txqi->schedule_order); 1496 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1497 } 1498 1499 void ieee80211_txq_set_params(struct ieee80211_local *local) 1500 { 1501 if (local->hw.wiphy->txq_limit) 1502 local->fq.limit = local->hw.wiphy->txq_limit; 1503 else 1504 local->hw.wiphy->txq_limit = local->fq.limit; 1505 1506 if (local->hw.wiphy->txq_memory_limit) 1507 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1508 else 1509 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1510 1511 if (local->hw.wiphy->txq_quantum) 1512 local->fq.quantum = local->hw.wiphy->txq_quantum; 1513 else 1514 local->hw.wiphy->txq_quantum = local->fq.quantum; 1515 } 1516 1517 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1518 { 1519 struct fq *fq = &local->fq; 1520 int ret; 1521 int i; 1522 bool supp_vht = false; 1523 enum nl80211_band band; 1524 1525 if (!local->ops->wake_tx_queue) 1526 return 0; 1527 1528 ret = fq_init(fq, 4096); 1529 if (ret) 1530 return ret; 1531 1532 /* 1533 * If the hardware doesn't support VHT, it is safe to limit the maximum 1534 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1535 */ 1536 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1537 struct ieee80211_supported_band *sband; 1538 1539 sband = local->hw.wiphy->bands[band]; 1540 if (!sband) 1541 continue; 1542 1543 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1544 } 1545 1546 if (!supp_vht) 1547 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1548 1549 codel_params_init(&local->cparams); 1550 local->cparams.interval = MS2TIME(100); 1551 local->cparams.target = MS2TIME(20); 1552 local->cparams.ecn = true; 1553 1554 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1555 GFP_KERNEL); 1556 if (!local->cvars) { 1557 spin_lock_bh(&fq->lock); 1558 fq_reset(fq, fq_skb_free_func); 1559 spin_unlock_bh(&fq->lock); 1560 return -ENOMEM; 1561 } 1562 1563 for (i = 0; i < fq->flows_cnt; i++) 1564 codel_vars_init(&local->cvars[i]); 1565 1566 ieee80211_txq_set_params(local); 1567 1568 return 0; 1569 } 1570 1571 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1572 { 1573 struct fq *fq = &local->fq; 1574 1575 if (!local->ops->wake_tx_queue) 1576 return; 1577 1578 kfree(local->cvars); 1579 local->cvars = NULL; 1580 1581 spin_lock_bh(&fq->lock); 1582 fq_reset(fq, fq_skb_free_func); 1583 spin_unlock_bh(&fq->lock); 1584 } 1585 1586 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1587 struct ieee80211_sub_if_data *sdata, 1588 struct sta_info *sta, 1589 struct sk_buff *skb) 1590 { 1591 struct ieee80211_vif *vif; 1592 struct txq_info *txqi; 1593 1594 if (!local->ops->wake_tx_queue || 1595 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1596 return false; 1597 1598 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1599 sdata = container_of(sdata->bss, 1600 struct ieee80211_sub_if_data, u.ap); 1601 1602 vif = &sdata->vif; 1603 txqi = ieee80211_get_txq(local, vif, sta, skb); 1604 1605 if (!txqi) 1606 return false; 1607 1608 ieee80211_txq_enqueue(local, txqi, skb); 1609 1610 schedule_and_wake_txq(local, txqi); 1611 1612 return true; 1613 } 1614 1615 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1616 struct ieee80211_vif *vif, 1617 struct sta_info *sta, 1618 struct sk_buff_head *skbs, 1619 bool txpending) 1620 { 1621 struct ieee80211_tx_control control = {}; 1622 struct sk_buff *skb, *tmp; 1623 unsigned long flags; 1624 1625 skb_queue_walk_safe(skbs, skb, tmp) { 1626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1627 int q = info->hw_queue; 1628 1629 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1630 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1631 __skb_unlink(skb, skbs); 1632 ieee80211_free_txskb(&local->hw, skb); 1633 continue; 1634 } 1635 #endif 1636 1637 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1638 if (local->queue_stop_reasons[q] || 1639 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1640 if (unlikely(info->flags & 1641 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1642 if (local->queue_stop_reasons[q] & 1643 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1644 /* 1645 * Drop off-channel frames if queues 1646 * are stopped for any reason other 1647 * than off-channel operation. Never 1648 * queue them. 1649 */ 1650 spin_unlock_irqrestore( 1651 &local->queue_stop_reason_lock, 1652 flags); 1653 ieee80211_purge_tx_queue(&local->hw, 1654 skbs); 1655 return true; 1656 } 1657 } else { 1658 1659 /* 1660 * Since queue is stopped, queue up frames for 1661 * later transmission from the tx-pending 1662 * tasklet when the queue is woken again. 1663 */ 1664 if (txpending) 1665 skb_queue_splice_init(skbs, 1666 &local->pending[q]); 1667 else 1668 skb_queue_splice_tail_init(skbs, 1669 &local->pending[q]); 1670 1671 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1672 flags); 1673 return false; 1674 } 1675 } 1676 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1677 1678 info->control.vif = vif; 1679 control.sta = sta ? &sta->sta : NULL; 1680 1681 __skb_unlink(skb, skbs); 1682 drv_tx(local, &control, skb); 1683 } 1684 1685 return true; 1686 } 1687 1688 /* 1689 * Returns false if the frame couldn't be transmitted but was queued instead. 1690 */ 1691 static bool __ieee80211_tx(struct ieee80211_local *local, 1692 struct sk_buff_head *skbs, int led_len, 1693 struct sta_info *sta, bool txpending) 1694 { 1695 struct ieee80211_tx_info *info; 1696 struct ieee80211_sub_if_data *sdata; 1697 struct ieee80211_vif *vif; 1698 struct sk_buff *skb; 1699 bool result; 1700 __le16 fc; 1701 1702 if (WARN_ON(skb_queue_empty(skbs))) 1703 return true; 1704 1705 skb = skb_peek(skbs); 1706 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1707 info = IEEE80211_SKB_CB(skb); 1708 sdata = vif_to_sdata(info->control.vif); 1709 if (sta && !sta->uploaded) 1710 sta = NULL; 1711 1712 switch (sdata->vif.type) { 1713 case NL80211_IFTYPE_MONITOR: 1714 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1715 vif = &sdata->vif; 1716 break; 1717 } 1718 sdata = rcu_dereference(local->monitor_sdata); 1719 if (sdata) { 1720 vif = &sdata->vif; 1721 info->hw_queue = 1722 vif->hw_queue[skb_get_queue_mapping(skb)]; 1723 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1724 ieee80211_purge_tx_queue(&local->hw, skbs); 1725 return true; 1726 } else 1727 vif = NULL; 1728 break; 1729 case NL80211_IFTYPE_AP_VLAN: 1730 sdata = container_of(sdata->bss, 1731 struct ieee80211_sub_if_data, u.ap); 1732 fallthrough; 1733 default: 1734 vif = &sdata->vif; 1735 break; 1736 } 1737 1738 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1739 1740 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1741 1742 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1743 1744 return result; 1745 } 1746 1747 /* 1748 * Invoke TX handlers, return 0 on success and non-zero if the 1749 * frame was dropped or queued. 1750 * 1751 * The handlers are split into an early and late part. The latter is everything 1752 * that can be sensitive to reordering, and will be deferred to after packets 1753 * are dequeued from the intermediate queues (when they are enabled). 1754 */ 1755 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1756 { 1757 ieee80211_tx_result res = TX_DROP; 1758 1759 #define CALL_TXH(txh) \ 1760 do { \ 1761 res = txh(tx); \ 1762 if (res != TX_CONTINUE) \ 1763 goto txh_done; \ 1764 } while (0) 1765 1766 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1767 CALL_TXH(ieee80211_tx_h_check_assoc); 1768 CALL_TXH(ieee80211_tx_h_ps_buf); 1769 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1770 CALL_TXH(ieee80211_tx_h_select_key); 1771 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1772 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1773 1774 txh_done: 1775 if (unlikely(res == TX_DROP)) { 1776 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1777 if (tx->skb) 1778 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1779 else 1780 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1781 return -1; 1782 } else if (unlikely(res == TX_QUEUED)) { 1783 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1784 return -1; 1785 } 1786 1787 return 0; 1788 } 1789 1790 /* 1791 * Late handlers can be called while the sta lock is held. Handlers that can 1792 * cause packets to be generated will cause deadlock! 1793 */ 1794 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1795 { 1796 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1797 ieee80211_tx_result res = TX_CONTINUE; 1798 1799 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1800 __skb_queue_tail(&tx->skbs, tx->skb); 1801 tx->skb = NULL; 1802 goto txh_done; 1803 } 1804 1805 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1806 CALL_TXH(ieee80211_tx_h_sequence); 1807 CALL_TXH(ieee80211_tx_h_fragment); 1808 /* handlers after fragment must be aware of tx info fragmentation! */ 1809 CALL_TXH(ieee80211_tx_h_stats); 1810 CALL_TXH(ieee80211_tx_h_encrypt); 1811 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1812 CALL_TXH(ieee80211_tx_h_calculate_duration); 1813 #undef CALL_TXH 1814 1815 txh_done: 1816 if (unlikely(res == TX_DROP)) { 1817 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1818 if (tx->skb) 1819 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1820 else 1821 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1822 return -1; 1823 } else if (unlikely(res == TX_QUEUED)) { 1824 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1825 return -1; 1826 } 1827 1828 return 0; 1829 } 1830 1831 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1832 { 1833 int r = invoke_tx_handlers_early(tx); 1834 1835 if (r) 1836 return r; 1837 return invoke_tx_handlers_late(tx); 1838 } 1839 1840 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1841 struct ieee80211_vif *vif, struct sk_buff *skb, 1842 int band, struct ieee80211_sta **sta) 1843 { 1844 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1845 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1846 struct ieee80211_tx_data tx; 1847 struct sk_buff *skb2; 1848 1849 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1850 return false; 1851 1852 info->band = band; 1853 info->control.vif = vif; 1854 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1855 1856 if (invoke_tx_handlers(&tx)) 1857 return false; 1858 1859 if (sta) { 1860 if (tx.sta) 1861 *sta = &tx.sta->sta; 1862 else 1863 *sta = NULL; 1864 } 1865 1866 /* this function isn't suitable for fragmented data frames */ 1867 skb2 = __skb_dequeue(&tx.skbs); 1868 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1869 ieee80211_free_txskb(hw, skb2); 1870 ieee80211_purge_tx_queue(hw, &tx.skbs); 1871 return false; 1872 } 1873 1874 return true; 1875 } 1876 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1877 1878 /* 1879 * Returns false if the frame couldn't be transmitted but was queued instead. 1880 */ 1881 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1882 struct sta_info *sta, struct sk_buff *skb, 1883 bool txpending) 1884 { 1885 struct ieee80211_local *local = sdata->local; 1886 struct ieee80211_tx_data tx; 1887 ieee80211_tx_result res_prepare; 1888 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1889 bool result = true; 1890 int led_len; 1891 1892 if (unlikely(skb->len < 10)) { 1893 dev_kfree_skb(skb); 1894 return true; 1895 } 1896 1897 /* initialises tx */ 1898 led_len = skb->len; 1899 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1900 1901 if (unlikely(res_prepare == TX_DROP)) { 1902 ieee80211_free_txskb(&local->hw, skb); 1903 return true; 1904 } else if (unlikely(res_prepare == TX_QUEUED)) { 1905 return true; 1906 } 1907 1908 /* set up hw_queue value early */ 1909 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1910 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1911 info->hw_queue = 1912 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1913 1914 if (invoke_tx_handlers_early(&tx)) 1915 return true; 1916 1917 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1918 return true; 1919 1920 if (!invoke_tx_handlers_late(&tx)) 1921 result = __ieee80211_tx(local, &tx.skbs, led_len, 1922 tx.sta, txpending); 1923 1924 return result; 1925 } 1926 1927 /* device xmit handlers */ 1928 1929 enum ieee80211_encrypt { 1930 ENCRYPT_NO, 1931 ENCRYPT_MGMT, 1932 ENCRYPT_DATA, 1933 }; 1934 1935 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1936 struct sk_buff *skb, 1937 int head_need, 1938 enum ieee80211_encrypt encrypt) 1939 { 1940 struct ieee80211_local *local = sdata->local; 1941 bool enc_tailroom; 1942 int tail_need = 0; 1943 1944 enc_tailroom = encrypt == ENCRYPT_MGMT || 1945 (encrypt == ENCRYPT_DATA && 1946 sdata->crypto_tx_tailroom_needed_cnt); 1947 1948 if (enc_tailroom) { 1949 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1950 tail_need -= skb_tailroom(skb); 1951 tail_need = max_t(int, tail_need, 0); 1952 } 1953 1954 if (skb_cloned(skb) && 1955 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1956 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1957 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1958 else if (head_need || tail_need) 1959 I802_DEBUG_INC(local->tx_expand_skb_head); 1960 else 1961 return 0; 1962 1963 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1964 wiphy_debug(local->hw.wiphy, 1965 "failed to reallocate TX buffer\n"); 1966 return -ENOMEM; 1967 } 1968 1969 return 0; 1970 } 1971 1972 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1973 struct sta_info *sta, struct sk_buff *skb) 1974 { 1975 struct ieee80211_local *local = sdata->local; 1976 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1977 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1978 int headroom; 1979 enum ieee80211_encrypt encrypt; 1980 1981 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 1982 encrypt = ENCRYPT_NO; 1983 else if (ieee80211_is_mgmt(hdr->frame_control)) 1984 encrypt = ENCRYPT_MGMT; 1985 else 1986 encrypt = ENCRYPT_DATA; 1987 1988 headroom = local->tx_headroom; 1989 if (encrypt != ENCRYPT_NO) 1990 headroom += sdata->encrypt_headroom; 1991 headroom -= skb_headroom(skb); 1992 headroom = max_t(int, 0, headroom); 1993 1994 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 1995 ieee80211_free_txskb(&local->hw, skb); 1996 return; 1997 } 1998 1999 /* reload after potential resize */ 2000 hdr = (struct ieee80211_hdr *) skb->data; 2001 info->control.vif = &sdata->vif; 2002 2003 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2004 if (ieee80211_is_data(hdr->frame_control) && 2005 is_unicast_ether_addr(hdr->addr1)) { 2006 if (mesh_nexthop_resolve(sdata, skb)) 2007 return; /* skb queued: don't free */ 2008 } else { 2009 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2010 } 2011 } 2012 2013 ieee80211_set_qos_hdr(sdata, skb); 2014 ieee80211_tx(sdata, sta, skb, false); 2015 } 2016 2017 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2018 struct net_device *dev) 2019 { 2020 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2021 struct ieee80211_radiotap_iterator iterator; 2022 struct ieee80211_radiotap_header *rthdr = 2023 (struct ieee80211_radiotap_header *) skb->data; 2024 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2025 struct ieee80211_supported_band *sband = 2026 local->hw.wiphy->bands[info->band]; 2027 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2028 NULL); 2029 u16 txflags; 2030 u16 rate = 0; 2031 bool rate_found = false; 2032 u8 rate_retries = 0; 2033 u16 rate_flags = 0; 2034 u8 mcs_known, mcs_flags, mcs_bw; 2035 u16 vht_known; 2036 u8 vht_mcs = 0, vht_nss = 0; 2037 int i; 2038 2039 /* check for not even having the fixed radiotap header part */ 2040 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2041 return false; /* too short to be possibly valid */ 2042 2043 /* is it a header version we can trust to find length from? */ 2044 if (unlikely(rthdr->it_version)) 2045 return false; /* only version 0 is supported */ 2046 2047 /* does the skb contain enough to deliver on the alleged length? */ 2048 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2049 return false; /* skb too short for claimed rt header extent */ 2050 2051 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2052 IEEE80211_TX_CTL_DONTFRAG; 2053 2054 /* 2055 * for every radiotap entry that is present 2056 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2057 * entries present, or -EINVAL on error) 2058 */ 2059 2060 while (!ret) { 2061 ret = ieee80211_radiotap_iterator_next(&iterator); 2062 2063 if (ret) 2064 continue; 2065 2066 /* see if this argument is something we can use */ 2067 switch (iterator.this_arg_index) { 2068 /* 2069 * You must take care when dereferencing iterator.this_arg 2070 * for multibyte types... the pointer is not aligned. Use 2071 * get_unaligned((type *)iterator.this_arg) to dereference 2072 * iterator.this_arg for type "type" safely on all arches. 2073 */ 2074 case IEEE80211_RADIOTAP_FLAGS: 2075 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2076 /* 2077 * this indicates that the skb we have been 2078 * handed has the 32-bit FCS CRC at the end... 2079 * we should react to that by snipping it off 2080 * because it will be recomputed and added 2081 * on transmission 2082 */ 2083 if (skb->len < (iterator._max_length + FCS_LEN)) 2084 return false; 2085 2086 skb_trim(skb, skb->len - FCS_LEN); 2087 } 2088 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2089 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2090 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2091 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2092 break; 2093 2094 case IEEE80211_RADIOTAP_TX_FLAGS: 2095 txflags = get_unaligned_le16(iterator.this_arg); 2096 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2097 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2098 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2099 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2100 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2101 info->control.flags |= 2102 IEEE80211_TX_CTRL_DONT_REORDER; 2103 break; 2104 2105 case IEEE80211_RADIOTAP_RATE: 2106 rate = *iterator.this_arg; 2107 rate_flags = 0; 2108 rate_found = true; 2109 break; 2110 2111 case IEEE80211_RADIOTAP_DATA_RETRIES: 2112 rate_retries = *iterator.this_arg; 2113 break; 2114 2115 case IEEE80211_RADIOTAP_MCS: 2116 mcs_known = iterator.this_arg[0]; 2117 mcs_flags = iterator.this_arg[1]; 2118 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2119 break; 2120 2121 rate_found = true; 2122 rate = iterator.this_arg[2]; 2123 rate_flags = IEEE80211_TX_RC_MCS; 2124 2125 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2126 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2127 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2128 2129 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2130 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2131 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2132 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2133 2134 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2135 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2136 info->flags |= IEEE80211_TX_CTL_LDPC; 2137 2138 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2139 u8 stbc = u8_get_bits(mcs_flags, 2140 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2141 2142 info->flags |= 2143 u32_encode_bits(stbc, 2144 IEEE80211_TX_CTL_STBC); 2145 } 2146 break; 2147 2148 case IEEE80211_RADIOTAP_VHT: 2149 vht_known = get_unaligned_le16(iterator.this_arg); 2150 rate_found = true; 2151 2152 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2153 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2154 (iterator.this_arg[2] & 2155 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2156 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2157 if (vht_known & 2158 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2159 if (iterator.this_arg[3] == 1) 2160 rate_flags |= 2161 IEEE80211_TX_RC_40_MHZ_WIDTH; 2162 else if (iterator.this_arg[3] == 4) 2163 rate_flags |= 2164 IEEE80211_TX_RC_80_MHZ_WIDTH; 2165 else if (iterator.this_arg[3] == 11) 2166 rate_flags |= 2167 IEEE80211_TX_RC_160_MHZ_WIDTH; 2168 } 2169 2170 vht_mcs = iterator.this_arg[4] >> 4; 2171 vht_nss = iterator.this_arg[4] & 0xF; 2172 break; 2173 2174 /* 2175 * Please update the file 2176 * Documentation/networking/mac80211-injection.rst 2177 * when parsing new fields here. 2178 */ 2179 2180 default: 2181 break; 2182 } 2183 } 2184 2185 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2186 return false; 2187 2188 if (rate_found) { 2189 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2190 2191 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2192 info->control.rates[i].idx = -1; 2193 info->control.rates[i].flags = 0; 2194 info->control.rates[i].count = 0; 2195 } 2196 2197 if (rate_flags & IEEE80211_TX_RC_MCS) { 2198 info->control.rates[0].idx = rate; 2199 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2200 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2201 vht_nss); 2202 } else { 2203 for (i = 0; i < sband->n_bitrates; i++) { 2204 if (rate * 5 != sband->bitrates[i].bitrate) 2205 continue; 2206 2207 info->control.rates[0].idx = i; 2208 break; 2209 } 2210 } 2211 2212 if (info->control.rates[0].idx < 0) 2213 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2214 2215 info->control.rates[0].flags = rate_flags; 2216 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2217 local->hw.max_rate_tries); 2218 } 2219 2220 return true; 2221 } 2222 2223 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2224 struct net_device *dev) 2225 { 2226 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2227 struct ieee80211_chanctx_conf *chanctx_conf; 2228 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2229 struct ieee80211_hdr *hdr; 2230 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2231 struct cfg80211_chan_def *chandef; 2232 u16 len_rthdr; 2233 int hdrlen; 2234 2235 memset(info, 0, sizeof(*info)); 2236 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2237 IEEE80211_TX_CTL_INJECTED; 2238 2239 /* Sanity-check and process the injection radiotap header */ 2240 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2241 goto fail; 2242 2243 /* we now know there is a radiotap header with a length we can use */ 2244 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2245 2246 /* 2247 * fix up the pointers accounting for the radiotap 2248 * header still being in there. We are being given 2249 * a precooked IEEE80211 header so no need for 2250 * normal processing 2251 */ 2252 skb_set_mac_header(skb, len_rthdr); 2253 /* 2254 * these are just fixed to the end of the rt area since we 2255 * don't have any better information and at this point, nobody cares 2256 */ 2257 skb_set_network_header(skb, len_rthdr); 2258 skb_set_transport_header(skb, len_rthdr); 2259 2260 if (skb->len < len_rthdr + 2) 2261 goto fail; 2262 2263 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2264 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2265 2266 if (skb->len < len_rthdr + hdrlen) 2267 goto fail; 2268 2269 /* 2270 * Initialize skb->protocol if the injected frame is a data frame 2271 * carrying a rfc1042 header 2272 */ 2273 if (ieee80211_is_data(hdr->frame_control) && 2274 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2275 u8 *payload = (u8 *)hdr + hdrlen; 2276 2277 if (ether_addr_equal(payload, rfc1042_header)) 2278 skb->protocol = cpu_to_be16((payload[6] << 8) | 2279 payload[7]); 2280 } 2281 2282 rcu_read_lock(); 2283 2284 /* 2285 * We process outgoing injected frames that have a local address 2286 * we handle as though they are non-injected frames. 2287 * This code here isn't entirely correct, the local MAC address 2288 * isn't always enough to find the interface to use; for proper 2289 * VLAN support we have an nl80211-based mechanism. 2290 * 2291 * This is necessary, for example, for old hostapd versions that 2292 * don't use nl80211-based management TX/RX. 2293 */ 2294 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2295 2296 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2297 if (!ieee80211_sdata_running(tmp_sdata)) 2298 continue; 2299 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2300 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2301 continue; 2302 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2303 sdata = tmp_sdata; 2304 break; 2305 } 2306 } 2307 2308 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2309 if (!chanctx_conf) { 2310 tmp_sdata = rcu_dereference(local->monitor_sdata); 2311 if (tmp_sdata) 2312 chanctx_conf = 2313 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2314 } 2315 2316 if (chanctx_conf) 2317 chandef = &chanctx_conf->def; 2318 else if (!local->use_chanctx) 2319 chandef = &local->_oper_chandef; 2320 else 2321 goto fail_rcu; 2322 2323 /* 2324 * Frame injection is not allowed if beaconing is not allowed 2325 * or if we need radar detection. Beaconing is usually not allowed when 2326 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2327 * Passive scan is also used in world regulatory domains where 2328 * your country is not known and as such it should be treated as 2329 * NO TX unless the channel is explicitly allowed in which case 2330 * your current regulatory domain would not have the passive scan 2331 * flag. 2332 * 2333 * Since AP mode uses monitor interfaces to inject/TX management 2334 * frames we can make AP mode the exception to this rule once it 2335 * supports radar detection as its implementation can deal with 2336 * radar detection by itself. We can do that later by adding a 2337 * monitor flag interfaces used for AP support. 2338 */ 2339 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2340 sdata->vif.type)) 2341 goto fail_rcu; 2342 2343 info->band = chandef->chan->band; 2344 2345 /* Initialize skb->priority according to frame type and TID class, 2346 * with respect to the sub interface that the frame will actually 2347 * be transmitted on. If the DONT_REORDER flag is set, the original 2348 * skb-priority is preserved to assure frames injected with this 2349 * flag are not reordered relative to each other. 2350 */ 2351 ieee80211_select_queue_80211(sdata, skb, hdr); 2352 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2353 2354 /* remove the injection radiotap header */ 2355 skb_pull(skb, len_rthdr); 2356 2357 ieee80211_xmit(sdata, NULL, skb); 2358 rcu_read_unlock(); 2359 2360 return NETDEV_TX_OK; 2361 2362 fail_rcu: 2363 rcu_read_unlock(); 2364 fail: 2365 dev_kfree_skb(skb); 2366 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2367 } 2368 2369 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2370 { 2371 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2372 2373 return ethertype == ETH_P_TDLS && 2374 skb->len > 14 && 2375 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2376 } 2377 2378 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2379 struct sk_buff *skb, 2380 struct sta_info **sta_out) 2381 { 2382 struct sta_info *sta; 2383 2384 switch (sdata->vif.type) { 2385 case NL80211_IFTYPE_AP_VLAN: 2386 sta = rcu_dereference(sdata->u.vlan.sta); 2387 if (sta) { 2388 *sta_out = sta; 2389 return 0; 2390 } else if (sdata->wdev.use_4addr) { 2391 return -ENOLINK; 2392 } 2393 fallthrough; 2394 case NL80211_IFTYPE_AP: 2395 case NL80211_IFTYPE_OCB: 2396 case NL80211_IFTYPE_ADHOC: 2397 if (is_multicast_ether_addr(skb->data)) { 2398 *sta_out = ERR_PTR(-ENOENT); 2399 return 0; 2400 } 2401 sta = sta_info_get_bss(sdata, skb->data); 2402 break; 2403 #ifdef CONFIG_MAC80211_MESH 2404 case NL80211_IFTYPE_MESH_POINT: 2405 /* determined much later */ 2406 *sta_out = NULL; 2407 return 0; 2408 #endif 2409 case NL80211_IFTYPE_STATION: 2410 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2411 sta = sta_info_get(sdata, skb->data); 2412 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2413 if (test_sta_flag(sta, 2414 WLAN_STA_TDLS_PEER_AUTH)) { 2415 *sta_out = sta; 2416 return 0; 2417 } 2418 2419 /* 2420 * TDLS link during setup - throw out frames to 2421 * peer. Allow TDLS-setup frames to unauthorized 2422 * peers for the special case of a link teardown 2423 * after a TDLS sta is removed due to being 2424 * unreachable. 2425 */ 2426 if (!ieee80211_is_tdls_setup(skb)) 2427 return -EINVAL; 2428 } 2429 2430 } 2431 2432 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2433 if (!sta) 2434 return -ENOLINK; 2435 break; 2436 default: 2437 return -EINVAL; 2438 } 2439 2440 *sta_out = sta ?: ERR_PTR(-ENOENT); 2441 return 0; 2442 } 2443 2444 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2445 struct sk_buff *skb, 2446 u32 *info_flags, 2447 u64 *cookie) 2448 { 2449 struct sk_buff *ack_skb; 2450 u16 info_id = 0; 2451 2452 if (skb->sk) 2453 ack_skb = skb_clone_sk(skb); 2454 else 2455 ack_skb = skb_clone(skb, GFP_ATOMIC); 2456 2457 if (ack_skb) { 2458 unsigned long flags; 2459 int id; 2460 2461 spin_lock_irqsave(&local->ack_status_lock, flags); 2462 id = idr_alloc(&local->ack_status_frames, ack_skb, 2463 1, 0x2000, GFP_ATOMIC); 2464 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2465 2466 if (id >= 0) { 2467 info_id = id; 2468 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2469 if (cookie) { 2470 *cookie = ieee80211_mgmt_tx_cookie(local); 2471 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2472 } 2473 } else { 2474 kfree_skb(ack_skb); 2475 } 2476 } 2477 2478 return info_id; 2479 } 2480 2481 /** 2482 * ieee80211_build_hdr - build 802.11 header in the given frame 2483 * @sdata: virtual interface to build the header for 2484 * @skb: the skb to build the header in 2485 * @info_flags: skb flags to set 2486 * @sta: the station pointer 2487 * @ctrl_flags: info control flags to set 2488 * @cookie: cookie pointer to fill (if not %NULL) 2489 * 2490 * This function takes the skb with 802.3 header and reformats the header to 2491 * the appropriate IEEE 802.11 header based on which interface the packet is 2492 * being transmitted on. 2493 * 2494 * Note that this function also takes care of the TX status request and 2495 * potential unsharing of the SKB - this needs to be interleaved with the 2496 * header building. 2497 * 2498 * The function requires the read-side RCU lock held 2499 * 2500 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2501 */ 2502 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2503 struct sk_buff *skb, u32 info_flags, 2504 struct sta_info *sta, u32 ctrl_flags, 2505 u64 *cookie) 2506 { 2507 struct ieee80211_local *local = sdata->local; 2508 struct ieee80211_tx_info *info; 2509 int head_need; 2510 u16 ethertype, hdrlen, meshhdrlen = 0; 2511 __le16 fc; 2512 struct ieee80211_hdr hdr; 2513 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2514 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2515 const u8 *encaps_data; 2516 int encaps_len, skip_header_bytes; 2517 bool wme_sta = false, authorized = false; 2518 bool tdls_peer; 2519 bool multicast; 2520 u16 info_id = 0; 2521 struct ieee80211_chanctx_conf *chanctx_conf; 2522 struct ieee80211_sub_if_data *ap_sdata; 2523 enum nl80211_band band; 2524 int ret; 2525 2526 if (IS_ERR(sta)) 2527 sta = NULL; 2528 2529 #ifdef CONFIG_MAC80211_DEBUGFS 2530 if (local->force_tx_status) 2531 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2532 #endif 2533 2534 /* convert Ethernet header to proper 802.11 header (based on 2535 * operation mode) */ 2536 ethertype = (skb->data[12] << 8) | skb->data[13]; 2537 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2538 2539 switch (sdata->vif.type) { 2540 case NL80211_IFTYPE_AP_VLAN: 2541 if (sdata->wdev.use_4addr) { 2542 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2543 /* RA TA DA SA */ 2544 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2545 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2546 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2547 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2548 hdrlen = 30; 2549 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2550 wme_sta = sta->sta.wme; 2551 } 2552 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2553 u.ap); 2554 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2555 if (!chanctx_conf) { 2556 ret = -ENOTCONN; 2557 goto free; 2558 } 2559 band = chanctx_conf->def.chan->band; 2560 if (sdata->wdev.use_4addr) 2561 break; 2562 fallthrough; 2563 case NL80211_IFTYPE_AP: 2564 if (sdata->vif.type == NL80211_IFTYPE_AP) 2565 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2566 if (!chanctx_conf) { 2567 ret = -ENOTCONN; 2568 goto free; 2569 } 2570 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2571 /* DA BSSID SA */ 2572 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2573 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2574 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2575 hdrlen = 24; 2576 band = chanctx_conf->def.chan->band; 2577 break; 2578 #ifdef CONFIG_MAC80211_MESH 2579 case NL80211_IFTYPE_MESH_POINT: 2580 if (!is_multicast_ether_addr(skb->data)) { 2581 struct sta_info *next_hop; 2582 bool mpp_lookup = true; 2583 2584 mpath = mesh_path_lookup(sdata, skb->data); 2585 if (mpath) { 2586 mpp_lookup = false; 2587 next_hop = rcu_dereference(mpath->next_hop); 2588 if (!next_hop || 2589 !(mpath->flags & (MESH_PATH_ACTIVE | 2590 MESH_PATH_RESOLVING))) 2591 mpp_lookup = true; 2592 } 2593 2594 if (mpp_lookup) { 2595 mppath = mpp_path_lookup(sdata, skb->data); 2596 if (mppath) 2597 mppath->exp_time = jiffies; 2598 } 2599 2600 if (mppath && mpath) 2601 mesh_path_del(sdata, mpath->dst); 2602 } 2603 2604 /* 2605 * Use address extension if it is a packet from 2606 * another interface or if we know the destination 2607 * is being proxied by a portal (i.e. portal address 2608 * differs from proxied address) 2609 */ 2610 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2611 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2612 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2613 skb->data, skb->data + ETH_ALEN); 2614 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2615 NULL, NULL); 2616 } else { 2617 /* DS -> MBSS (802.11-2012 13.11.3.3). 2618 * For unicast with unknown forwarding information, 2619 * destination might be in the MBSS or if that fails 2620 * forwarded to another mesh gate. In either case 2621 * resolution will be handled in ieee80211_xmit(), so 2622 * leave the original DA. This also works for mcast */ 2623 const u8 *mesh_da = skb->data; 2624 2625 if (mppath) 2626 mesh_da = mppath->mpp; 2627 else if (mpath) 2628 mesh_da = mpath->dst; 2629 2630 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2631 mesh_da, sdata->vif.addr); 2632 if (is_multicast_ether_addr(mesh_da)) 2633 /* DA TA mSA AE:SA */ 2634 meshhdrlen = ieee80211_new_mesh_header( 2635 sdata, &mesh_hdr, 2636 skb->data + ETH_ALEN, NULL); 2637 else 2638 /* RA TA mDA mSA AE:DA SA */ 2639 meshhdrlen = ieee80211_new_mesh_header( 2640 sdata, &mesh_hdr, skb->data, 2641 skb->data + ETH_ALEN); 2642 2643 } 2644 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2645 if (!chanctx_conf) { 2646 ret = -ENOTCONN; 2647 goto free; 2648 } 2649 band = chanctx_conf->def.chan->band; 2650 2651 /* For injected frames, fill RA right away as nexthop lookup 2652 * will be skipped. 2653 */ 2654 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2655 is_zero_ether_addr(hdr.addr1)) 2656 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2657 break; 2658 #endif 2659 case NL80211_IFTYPE_STATION: 2660 /* we already did checks when looking up the RA STA */ 2661 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2662 2663 if (tdls_peer) { 2664 /* DA SA BSSID */ 2665 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2666 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2667 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2668 hdrlen = 24; 2669 } else if (sdata->u.mgd.use_4addr && 2670 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2671 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2672 IEEE80211_FCTL_TODS); 2673 /* RA TA DA SA */ 2674 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2675 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2676 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2677 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2678 hdrlen = 30; 2679 } else { 2680 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2681 /* BSSID SA DA */ 2682 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2683 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2684 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2685 hdrlen = 24; 2686 } 2687 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2688 if (!chanctx_conf) { 2689 ret = -ENOTCONN; 2690 goto free; 2691 } 2692 band = chanctx_conf->def.chan->band; 2693 break; 2694 case NL80211_IFTYPE_OCB: 2695 /* DA SA BSSID */ 2696 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2697 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2698 eth_broadcast_addr(hdr.addr3); 2699 hdrlen = 24; 2700 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2701 if (!chanctx_conf) { 2702 ret = -ENOTCONN; 2703 goto free; 2704 } 2705 band = chanctx_conf->def.chan->band; 2706 break; 2707 case NL80211_IFTYPE_ADHOC: 2708 /* DA SA BSSID */ 2709 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2710 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2711 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2712 hdrlen = 24; 2713 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2714 if (!chanctx_conf) { 2715 ret = -ENOTCONN; 2716 goto free; 2717 } 2718 band = chanctx_conf->def.chan->band; 2719 break; 2720 default: 2721 ret = -EINVAL; 2722 goto free; 2723 } 2724 2725 multicast = is_multicast_ether_addr(hdr.addr1); 2726 2727 /* sta is always NULL for mesh */ 2728 if (sta) { 2729 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2730 wme_sta = sta->sta.wme; 2731 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2732 /* For mesh, the use of the QoS header is mandatory */ 2733 wme_sta = true; 2734 } 2735 2736 /* receiver does QoS (which also means we do) use it */ 2737 if (wme_sta) { 2738 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2739 hdrlen += 2; 2740 } 2741 2742 /* 2743 * Drop unicast frames to unauthorised stations unless they are 2744 * EAPOL frames from the local station. 2745 */ 2746 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2747 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2748 !multicast && !authorized && 2749 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2750 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2751 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2752 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2753 sdata->name, hdr.addr1); 2754 #endif 2755 2756 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2757 2758 ret = -EPERM; 2759 goto free; 2760 } 2761 2762 if (unlikely(!multicast && ((skb->sk && 2763 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2764 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2765 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2766 cookie); 2767 2768 /* 2769 * If the skb is shared we need to obtain our own copy. 2770 */ 2771 if (skb_shared(skb)) { 2772 struct sk_buff *tmp_skb = skb; 2773 2774 /* can't happen -- skb is a clone if info_id != 0 */ 2775 WARN_ON(info_id); 2776 2777 skb = skb_clone(skb, GFP_ATOMIC); 2778 kfree_skb(tmp_skb); 2779 2780 if (!skb) { 2781 ret = -ENOMEM; 2782 goto free; 2783 } 2784 } 2785 2786 hdr.frame_control = fc; 2787 hdr.duration_id = 0; 2788 hdr.seq_ctrl = 0; 2789 2790 skip_header_bytes = ETH_HLEN; 2791 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2792 encaps_data = bridge_tunnel_header; 2793 encaps_len = sizeof(bridge_tunnel_header); 2794 skip_header_bytes -= 2; 2795 } else if (ethertype >= ETH_P_802_3_MIN) { 2796 encaps_data = rfc1042_header; 2797 encaps_len = sizeof(rfc1042_header); 2798 skip_header_bytes -= 2; 2799 } else { 2800 encaps_data = NULL; 2801 encaps_len = 0; 2802 } 2803 2804 skb_pull(skb, skip_header_bytes); 2805 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2806 2807 /* 2808 * So we need to modify the skb header and hence need a copy of 2809 * that. The head_need variable above doesn't, so far, include 2810 * the needed header space that we don't need right away. If we 2811 * can, then we don't reallocate right now but only after the 2812 * frame arrives at the master device (if it does...) 2813 * 2814 * If we cannot, however, then we will reallocate to include all 2815 * the ever needed space. Also, if we need to reallocate it anyway, 2816 * make it big enough for everything we may ever need. 2817 */ 2818 2819 if (head_need > 0 || skb_cloned(skb)) { 2820 head_need += sdata->encrypt_headroom; 2821 head_need += local->tx_headroom; 2822 head_need = max_t(int, 0, head_need); 2823 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2824 ieee80211_free_txskb(&local->hw, skb); 2825 skb = NULL; 2826 return ERR_PTR(-ENOMEM); 2827 } 2828 } 2829 2830 if (encaps_data) 2831 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2832 2833 #ifdef CONFIG_MAC80211_MESH 2834 if (meshhdrlen > 0) 2835 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2836 #endif 2837 2838 if (ieee80211_is_data_qos(fc)) { 2839 __le16 *qos_control; 2840 2841 qos_control = skb_push(skb, 2); 2842 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2843 /* 2844 * Maybe we could actually set some fields here, for now just 2845 * initialise to zero to indicate no special operation. 2846 */ 2847 *qos_control = 0; 2848 } else 2849 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2850 2851 skb_reset_mac_header(skb); 2852 2853 info = IEEE80211_SKB_CB(skb); 2854 memset(info, 0, sizeof(*info)); 2855 2856 info->flags = info_flags; 2857 info->ack_frame_id = info_id; 2858 info->band = band; 2859 info->control.flags = ctrl_flags; 2860 2861 return skb; 2862 free: 2863 kfree_skb(skb); 2864 return ERR_PTR(ret); 2865 } 2866 2867 /* 2868 * fast-xmit overview 2869 * 2870 * The core idea of this fast-xmit is to remove per-packet checks by checking 2871 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2872 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2873 * much less work can be done per packet. For example, fragmentation must be 2874 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2875 * in the code here. 2876 * 2877 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2878 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2879 * 2880 * The most difficult part of this is that when any of these assumptions 2881 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2882 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2883 * since the per-packet code no longer checks the conditions. This is reflected 2884 * by the calls to these functions throughout the rest of the code, and must be 2885 * maintained if any of the TX path checks change. 2886 */ 2887 2888 void ieee80211_check_fast_xmit(struct sta_info *sta) 2889 { 2890 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2891 struct ieee80211_local *local = sta->local; 2892 struct ieee80211_sub_if_data *sdata = sta->sdata; 2893 struct ieee80211_hdr *hdr = (void *)build.hdr; 2894 struct ieee80211_chanctx_conf *chanctx_conf; 2895 __le16 fc; 2896 2897 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2898 return; 2899 2900 /* Locking here protects both the pointer itself, and against concurrent 2901 * invocations winning data access races to, e.g., the key pointer that 2902 * is used. 2903 * Without it, the invocation of this function right after the key 2904 * pointer changes wouldn't be sufficient, as another CPU could access 2905 * the pointer, then stall, and then do the cache update after the CPU 2906 * that invalidated the key. 2907 * With the locking, such scenarios cannot happen as the check for the 2908 * key and the fast-tx assignment are done atomically, so the CPU that 2909 * modifies the key will either wait or other one will see the key 2910 * cleared/changed already. 2911 */ 2912 spin_lock_bh(&sta->lock); 2913 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2914 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2915 sdata->vif.type == NL80211_IFTYPE_STATION) 2916 goto out; 2917 2918 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2919 goto out; 2920 2921 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2922 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2923 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2924 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2925 goto out; 2926 2927 if (sdata->noack_map) 2928 goto out; 2929 2930 /* fast-xmit doesn't handle fragmentation at all */ 2931 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2932 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2933 goto out; 2934 2935 rcu_read_lock(); 2936 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2937 if (!chanctx_conf) { 2938 rcu_read_unlock(); 2939 goto out; 2940 } 2941 build.band = chanctx_conf->def.chan->band; 2942 rcu_read_unlock(); 2943 2944 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2945 2946 switch (sdata->vif.type) { 2947 case NL80211_IFTYPE_ADHOC: 2948 /* DA SA BSSID */ 2949 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2950 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2951 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2952 build.hdr_len = 24; 2953 break; 2954 case NL80211_IFTYPE_STATION: 2955 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2956 /* DA SA BSSID */ 2957 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2958 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2959 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2960 build.hdr_len = 24; 2961 break; 2962 } 2963 2964 if (sdata->u.mgd.use_4addr) { 2965 /* non-regular ethertype cannot use the fastpath */ 2966 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2967 IEEE80211_FCTL_TODS); 2968 /* RA TA DA SA */ 2969 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2970 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2971 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2972 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2973 build.hdr_len = 30; 2974 break; 2975 } 2976 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2977 /* BSSID SA DA */ 2978 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2979 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2980 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2981 build.hdr_len = 24; 2982 break; 2983 case NL80211_IFTYPE_AP_VLAN: 2984 if (sdata->wdev.use_4addr) { 2985 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2986 IEEE80211_FCTL_TODS); 2987 /* RA TA DA SA */ 2988 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2989 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2990 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2991 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2992 build.hdr_len = 30; 2993 break; 2994 } 2995 fallthrough; 2996 case NL80211_IFTYPE_AP: 2997 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2998 /* DA BSSID SA */ 2999 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3000 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3001 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3002 build.hdr_len = 24; 3003 break; 3004 default: 3005 /* not handled on fast-xmit */ 3006 goto out; 3007 } 3008 3009 if (sta->sta.wme) { 3010 build.hdr_len += 2; 3011 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3012 } 3013 3014 /* We store the key here so there's no point in using rcu_dereference() 3015 * but that's fine because the code that changes the pointers will call 3016 * this function after doing so. For a single CPU that would be enough, 3017 * for multiple see the comment above. 3018 */ 3019 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3020 if (!build.key) 3021 build.key = rcu_access_pointer(sdata->default_unicast_key); 3022 if (build.key) { 3023 bool gen_iv, iv_spc, mmic; 3024 3025 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3026 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3027 mmic = build.key->conf.flags & 3028 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3029 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3030 3031 /* don't handle software crypto */ 3032 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3033 goto out; 3034 3035 /* Key is being removed */ 3036 if (build.key->flags & KEY_FLAG_TAINTED) 3037 goto out; 3038 3039 switch (build.key->conf.cipher) { 3040 case WLAN_CIPHER_SUITE_CCMP: 3041 case WLAN_CIPHER_SUITE_CCMP_256: 3042 if (gen_iv) 3043 build.pn_offs = build.hdr_len; 3044 if (gen_iv || iv_spc) 3045 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3046 break; 3047 case WLAN_CIPHER_SUITE_GCMP: 3048 case WLAN_CIPHER_SUITE_GCMP_256: 3049 if (gen_iv) 3050 build.pn_offs = build.hdr_len; 3051 if (gen_iv || iv_spc) 3052 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3053 break; 3054 case WLAN_CIPHER_SUITE_TKIP: 3055 /* cannot handle MMIC or IV generation in xmit-fast */ 3056 if (mmic || gen_iv) 3057 goto out; 3058 if (iv_spc) 3059 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3060 break; 3061 case WLAN_CIPHER_SUITE_WEP40: 3062 case WLAN_CIPHER_SUITE_WEP104: 3063 /* cannot handle IV generation in fast-xmit */ 3064 if (gen_iv) 3065 goto out; 3066 if (iv_spc) 3067 build.hdr_len += IEEE80211_WEP_IV_LEN; 3068 break; 3069 case WLAN_CIPHER_SUITE_AES_CMAC: 3070 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3071 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3072 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3073 WARN(1, 3074 "management cipher suite 0x%x enabled for data\n", 3075 build.key->conf.cipher); 3076 goto out; 3077 default: 3078 /* we don't know how to generate IVs for this at all */ 3079 if (WARN_ON(gen_iv)) 3080 goto out; 3081 /* pure hardware keys are OK, of course */ 3082 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3083 break; 3084 /* cipher scheme might require space allocation */ 3085 if (iv_spc && 3086 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3087 goto out; 3088 if (iv_spc) 3089 build.hdr_len += build.key->conf.iv_len; 3090 } 3091 3092 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3093 } 3094 3095 hdr->frame_control = fc; 3096 3097 memcpy(build.hdr + build.hdr_len, 3098 rfc1042_header, sizeof(rfc1042_header)); 3099 build.hdr_len += sizeof(rfc1042_header); 3100 3101 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3102 /* if the kmemdup fails, continue w/o fast_tx */ 3103 if (!fast_tx) 3104 goto out; 3105 3106 out: 3107 /* we might have raced against another call to this function */ 3108 old = rcu_dereference_protected(sta->fast_tx, 3109 lockdep_is_held(&sta->lock)); 3110 rcu_assign_pointer(sta->fast_tx, fast_tx); 3111 if (old) 3112 kfree_rcu(old, rcu_head); 3113 spin_unlock_bh(&sta->lock); 3114 } 3115 3116 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3117 { 3118 struct sta_info *sta; 3119 3120 rcu_read_lock(); 3121 list_for_each_entry_rcu(sta, &local->sta_list, list) 3122 ieee80211_check_fast_xmit(sta); 3123 rcu_read_unlock(); 3124 } 3125 3126 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3127 { 3128 struct ieee80211_local *local = sdata->local; 3129 struct sta_info *sta; 3130 3131 rcu_read_lock(); 3132 3133 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3134 if (sdata != sta->sdata && 3135 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3136 continue; 3137 ieee80211_check_fast_xmit(sta); 3138 } 3139 3140 rcu_read_unlock(); 3141 } 3142 3143 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3144 { 3145 struct ieee80211_fast_tx *fast_tx; 3146 3147 spin_lock_bh(&sta->lock); 3148 fast_tx = rcu_dereference_protected(sta->fast_tx, 3149 lockdep_is_held(&sta->lock)); 3150 RCU_INIT_POINTER(sta->fast_tx, NULL); 3151 spin_unlock_bh(&sta->lock); 3152 3153 if (fast_tx) 3154 kfree_rcu(fast_tx, rcu_head); 3155 } 3156 3157 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3158 struct sk_buff *skb, int headroom) 3159 { 3160 if (skb_headroom(skb) < headroom) { 3161 I802_DEBUG_INC(local->tx_expand_skb_head); 3162 3163 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3164 wiphy_debug(local->hw.wiphy, 3165 "failed to reallocate TX buffer\n"); 3166 return false; 3167 } 3168 } 3169 3170 return true; 3171 } 3172 3173 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3174 struct ieee80211_fast_tx *fast_tx, 3175 struct sk_buff *skb) 3176 { 3177 struct ieee80211_local *local = sdata->local; 3178 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3179 struct ieee80211_hdr *hdr; 3180 struct ethhdr *amsdu_hdr; 3181 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3182 int subframe_len = skb->len - hdr_len; 3183 void *data; 3184 u8 *qc, *h_80211_src, *h_80211_dst; 3185 const u8 *bssid; 3186 3187 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3188 return false; 3189 3190 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3191 return true; 3192 3193 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3194 return false; 3195 3196 data = skb_push(skb, sizeof(*amsdu_hdr)); 3197 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3198 hdr = data; 3199 amsdu_hdr = data + hdr_len; 3200 /* h_80211_src/dst is addr* field within hdr */ 3201 h_80211_src = data + fast_tx->sa_offs; 3202 h_80211_dst = data + fast_tx->da_offs; 3203 3204 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3205 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3206 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3207 3208 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3209 * fields needs to be changed to BSSID for A-MSDU frames depending 3210 * on FromDS/ToDS values. 3211 */ 3212 switch (sdata->vif.type) { 3213 case NL80211_IFTYPE_STATION: 3214 bssid = sdata->u.mgd.bssid; 3215 break; 3216 case NL80211_IFTYPE_AP: 3217 case NL80211_IFTYPE_AP_VLAN: 3218 bssid = sdata->vif.addr; 3219 break; 3220 default: 3221 bssid = NULL; 3222 } 3223 3224 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3225 ether_addr_copy(h_80211_src, bssid); 3226 3227 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3228 ether_addr_copy(h_80211_dst, bssid); 3229 3230 qc = ieee80211_get_qos_ctl(hdr); 3231 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3232 3233 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3234 3235 return true; 3236 } 3237 3238 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3239 struct sta_info *sta, 3240 struct ieee80211_fast_tx *fast_tx, 3241 struct sk_buff *skb) 3242 { 3243 struct ieee80211_local *local = sdata->local; 3244 struct fq *fq = &local->fq; 3245 struct fq_tin *tin; 3246 struct fq_flow *flow; 3247 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3248 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3249 struct txq_info *txqi; 3250 struct sk_buff **frag_tail, *head; 3251 int subframe_len = skb->len - ETH_ALEN; 3252 u8 max_subframes = sta->sta.max_amsdu_subframes; 3253 int max_frags = local->hw.max_tx_fragments; 3254 int max_amsdu_len = sta->sta.max_amsdu_len; 3255 int orig_truesize; 3256 u32 flow_idx; 3257 __be16 len; 3258 void *data; 3259 bool ret = false; 3260 unsigned int orig_len; 3261 int n = 2, nfrags, pad = 0; 3262 u16 hdrlen; 3263 3264 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3265 return false; 3266 3267 if (skb_is_gso(skb)) 3268 return false; 3269 3270 if (!txq) 3271 return false; 3272 3273 txqi = to_txq_info(txq); 3274 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3275 return false; 3276 3277 if (sta->sta.max_rc_amsdu_len) 3278 max_amsdu_len = min_t(int, max_amsdu_len, 3279 sta->sta.max_rc_amsdu_len); 3280 3281 if (sta->sta.max_tid_amsdu_len[tid]) 3282 max_amsdu_len = min_t(int, max_amsdu_len, 3283 sta->sta.max_tid_amsdu_len[tid]); 3284 3285 flow_idx = fq_flow_idx(fq, skb); 3286 3287 spin_lock_bh(&fq->lock); 3288 3289 /* TODO: Ideally aggregation should be done on dequeue to remain 3290 * responsive to environment changes. 3291 */ 3292 3293 tin = &txqi->tin; 3294 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3295 head = skb_peek_tail(&flow->queue); 3296 if (!head || skb_is_gso(head)) 3297 goto out; 3298 3299 orig_truesize = head->truesize; 3300 orig_len = head->len; 3301 3302 if (skb->len + head->len > max_amsdu_len) 3303 goto out; 3304 3305 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3306 nfrags += 1 + skb_shinfo(head)->nr_frags; 3307 frag_tail = &skb_shinfo(head)->frag_list; 3308 while (*frag_tail) { 3309 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3310 frag_tail = &(*frag_tail)->next; 3311 n++; 3312 } 3313 3314 if (max_subframes && n > max_subframes) 3315 goto out; 3316 3317 if (max_frags && nfrags > max_frags) 3318 goto out; 3319 3320 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3321 goto out; 3322 3323 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3324 goto out; 3325 3326 /* 3327 * Pad out the previous subframe to a multiple of 4 by adding the 3328 * padding to the next one, that's being added. Note that head->len 3329 * is the length of the full A-MSDU, but that works since each time 3330 * we add a new subframe we pad out the previous one to a multiple 3331 * of 4 and thus it no longer matters in the next round. 3332 */ 3333 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3334 if ((head->len - hdrlen) & 3) 3335 pad = 4 - ((head->len - hdrlen) & 3); 3336 3337 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3338 2 + pad)) 3339 goto out_recalc; 3340 3341 ret = true; 3342 data = skb_push(skb, ETH_ALEN + 2); 3343 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3344 3345 data += 2 * ETH_ALEN; 3346 len = cpu_to_be16(subframe_len); 3347 memcpy(data, &len, 2); 3348 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3349 3350 memset(skb_push(skb, pad), 0, pad); 3351 3352 head->len += skb->len; 3353 head->data_len += skb->len; 3354 *frag_tail = skb; 3355 3356 out_recalc: 3357 fq->memory_usage += head->truesize - orig_truesize; 3358 if (head->len != orig_len) { 3359 flow->backlog += head->len - orig_len; 3360 tin->backlog_bytes += head->len - orig_len; 3361 } 3362 out: 3363 spin_unlock_bh(&fq->lock); 3364 3365 return ret; 3366 } 3367 3368 /* 3369 * Can be called while the sta lock is held. Anything that can cause packets to 3370 * be generated will cause deadlock! 3371 */ 3372 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3373 struct sta_info *sta, u8 pn_offs, 3374 struct ieee80211_key *key, 3375 struct sk_buff *skb) 3376 { 3377 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3378 struct ieee80211_hdr *hdr = (void *)skb->data; 3379 u8 tid = IEEE80211_NUM_TIDS; 3380 3381 if (key) 3382 info->control.hw_key = &key->conf; 3383 3384 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3385 3386 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3387 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3388 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3389 } else { 3390 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3391 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3392 sdata->sequence_number += 0x10; 3393 } 3394 3395 if (skb_shinfo(skb)->gso_size) 3396 sta->tx_stats.msdu[tid] += 3397 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3398 else 3399 sta->tx_stats.msdu[tid]++; 3400 3401 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3402 3403 /* statistics normally done by ieee80211_tx_h_stats (but that 3404 * has to consider fragmentation, so is more complex) 3405 */ 3406 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3407 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3408 3409 if (pn_offs) { 3410 u64 pn; 3411 u8 *crypto_hdr = skb->data + pn_offs; 3412 3413 switch (key->conf.cipher) { 3414 case WLAN_CIPHER_SUITE_CCMP: 3415 case WLAN_CIPHER_SUITE_CCMP_256: 3416 case WLAN_CIPHER_SUITE_GCMP: 3417 case WLAN_CIPHER_SUITE_GCMP_256: 3418 pn = atomic64_inc_return(&key->conf.tx_pn); 3419 crypto_hdr[0] = pn; 3420 crypto_hdr[1] = pn >> 8; 3421 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3422 crypto_hdr[4] = pn >> 16; 3423 crypto_hdr[5] = pn >> 24; 3424 crypto_hdr[6] = pn >> 32; 3425 crypto_hdr[7] = pn >> 40; 3426 break; 3427 } 3428 } 3429 } 3430 3431 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3432 struct sta_info *sta, 3433 struct ieee80211_fast_tx *fast_tx, 3434 struct sk_buff *skb) 3435 { 3436 struct ieee80211_local *local = sdata->local; 3437 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3438 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3439 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3440 struct ethhdr eth; 3441 struct ieee80211_tx_info *info; 3442 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3443 struct ieee80211_tx_data tx; 3444 ieee80211_tx_result r; 3445 struct tid_ampdu_tx *tid_tx = NULL; 3446 u8 tid = IEEE80211_NUM_TIDS; 3447 3448 /* control port protocol needs a lot of special handling */ 3449 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3450 return false; 3451 3452 /* only RFC 1042 SNAP */ 3453 if (ethertype < ETH_P_802_3_MIN) 3454 return false; 3455 3456 /* don't handle TX status request here either */ 3457 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3458 return false; 3459 3460 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3461 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3462 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3463 if (tid_tx) { 3464 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3465 return false; 3466 if (tid_tx->timeout) 3467 tid_tx->last_tx = jiffies; 3468 } 3469 } 3470 3471 /* after this point (skb is modified) we cannot return false */ 3472 3473 if (skb_shared(skb)) { 3474 struct sk_buff *tmp_skb = skb; 3475 3476 skb = skb_clone(skb, GFP_ATOMIC); 3477 kfree_skb(tmp_skb); 3478 3479 if (!skb) 3480 return true; 3481 } 3482 3483 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3484 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3485 return true; 3486 3487 /* will not be crypto-handled beyond what we do here, so use false 3488 * as the may-encrypt argument for the resize to not account for 3489 * more room than we already have in 'extra_head' 3490 */ 3491 if (unlikely(ieee80211_skb_resize(sdata, skb, 3492 max_t(int, extra_head + hw_headroom - 3493 skb_headroom(skb), 0), 3494 ENCRYPT_NO))) { 3495 kfree_skb(skb); 3496 return true; 3497 } 3498 3499 memcpy(ð, skb->data, ETH_HLEN - 2); 3500 hdr = skb_push(skb, extra_head); 3501 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3502 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3503 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3504 3505 info = IEEE80211_SKB_CB(skb); 3506 memset(info, 0, sizeof(*info)); 3507 info->band = fast_tx->band; 3508 info->control.vif = &sdata->vif; 3509 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3510 IEEE80211_TX_CTL_DONTFRAG | 3511 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3512 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3513 3514 #ifdef CONFIG_MAC80211_DEBUGFS 3515 if (local->force_tx_status) 3516 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3517 #endif 3518 3519 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3520 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3521 *ieee80211_get_qos_ctl(hdr) = tid; 3522 } 3523 3524 __skb_queue_head_init(&tx.skbs); 3525 3526 tx.flags = IEEE80211_TX_UNICAST; 3527 tx.local = local; 3528 tx.sdata = sdata; 3529 tx.sta = sta; 3530 tx.key = fast_tx->key; 3531 3532 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3533 tx.skb = skb; 3534 r = ieee80211_tx_h_rate_ctrl(&tx); 3535 skb = tx.skb; 3536 tx.skb = NULL; 3537 3538 if (r != TX_CONTINUE) { 3539 if (r != TX_QUEUED) 3540 kfree_skb(skb); 3541 return true; 3542 } 3543 } 3544 3545 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3546 return true; 3547 3548 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3549 fast_tx->key, skb); 3550 3551 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3552 sdata = container_of(sdata->bss, 3553 struct ieee80211_sub_if_data, u.ap); 3554 3555 __skb_queue_tail(&tx.skbs, skb); 3556 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3557 return true; 3558 } 3559 3560 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3561 struct ieee80211_txq *txq) 3562 { 3563 struct ieee80211_local *local = hw_to_local(hw); 3564 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3565 struct ieee80211_hdr *hdr; 3566 struct sk_buff *skb = NULL; 3567 struct fq *fq = &local->fq; 3568 struct fq_tin *tin = &txqi->tin; 3569 struct ieee80211_tx_info *info; 3570 struct ieee80211_tx_data tx; 3571 ieee80211_tx_result r; 3572 struct ieee80211_vif *vif = txq->vif; 3573 3574 WARN_ON_ONCE(softirq_count() == 0); 3575 3576 if (!ieee80211_txq_airtime_check(hw, txq)) 3577 return NULL; 3578 3579 begin: 3580 spin_lock_bh(&fq->lock); 3581 3582 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3583 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3584 goto out; 3585 3586 if (vif->txqs_stopped[txq->ac]) { 3587 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3588 goto out; 3589 } 3590 3591 /* Make sure fragments stay together. */ 3592 skb = __skb_dequeue(&txqi->frags); 3593 if (unlikely(skb)) { 3594 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3595 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3596 goto out; 3597 IEEE80211_SKB_CB(skb)->control.flags &= 3598 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3599 } else { 3600 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3601 } 3602 3603 if (!skb) 3604 goto out; 3605 3606 spin_unlock_bh(&fq->lock); 3607 3608 hdr = (struct ieee80211_hdr *)skb->data; 3609 info = IEEE80211_SKB_CB(skb); 3610 3611 memset(&tx, 0, sizeof(tx)); 3612 __skb_queue_head_init(&tx.skbs); 3613 tx.local = local; 3614 tx.skb = skb; 3615 tx.sdata = vif_to_sdata(info->control.vif); 3616 3617 if (txq->sta) { 3618 tx.sta = container_of(txq->sta, struct sta_info, sta); 3619 /* 3620 * Drop unicast frames to unauthorised stations unless they are 3621 * injected frames or EAPOL frames from the local station. 3622 */ 3623 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3624 ieee80211_is_data(hdr->frame_control) && 3625 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3626 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3627 !is_multicast_ether_addr(hdr->addr1) && 3628 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3629 (!(info->control.flags & 3630 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3631 !ether_addr_equal(tx.sdata->vif.addr, 3632 hdr->addr2)))) { 3633 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3634 ieee80211_free_txskb(&local->hw, skb); 3635 goto begin; 3636 } 3637 } 3638 3639 /* 3640 * The key can be removed while the packet was queued, so need to call 3641 * this here to get the current key. 3642 */ 3643 r = ieee80211_tx_h_select_key(&tx); 3644 if (r != TX_CONTINUE) { 3645 ieee80211_free_txskb(&local->hw, skb); 3646 goto begin; 3647 } 3648 3649 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3650 info->flags |= IEEE80211_TX_CTL_AMPDU; 3651 else 3652 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3653 3654 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 3655 goto encap_out; 3656 3657 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3658 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3659 sta); 3660 u8 pn_offs = 0; 3661 3662 if (tx.key && 3663 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3664 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3665 3666 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3667 tx.key, skb); 3668 } else { 3669 if (invoke_tx_handlers_late(&tx)) 3670 goto begin; 3671 3672 skb = __skb_dequeue(&tx.skbs); 3673 3674 if (!skb_queue_empty(&tx.skbs)) { 3675 spin_lock_bh(&fq->lock); 3676 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3677 spin_unlock_bh(&fq->lock); 3678 } 3679 } 3680 3681 if (skb_has_frag_list(skb) && 3682 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3683 if (skb_linearize(skb)) { 3684 ieee80211_free_txskb(&local->hw, skb); 3685 goto begin; 3686 } 3687 } 3688 3689 switch (tx.sdata->vif.type) { 3690 case NL80211_IFTYPE_MONITOR: 3691 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3692 vif = &tx.sdata->vif; 3693 break; 3694 } 3695 tx.sdata = rcu_dereference(local->monitor_sdata); 3696 if (tx.sdata) { 3697 vif = &tx.sdata->vif; 3698 info->hw_queue = 3699 vif->hw_queue[skb_get_queue_mapping(skb)]; 3700 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3701 ieee80211_free_txskb(&local->hw, skb); 3702 goto begin; 3703 } else { 3704 vif = NULL; 3705 } 3706 break; 3707 case NL80211_IFTYPE_AP_VLAN: 3708 tx.sdata = container_of(tx.sdata->bss, 3709 struct ieee80211_sub_if_data, u.ap); 3710 fallthrough; 3711 default: 3712 vif = &tx.sdata->vif; 3713 break; 3714 } 3715 3716 encap_out: 3717 IEEE80211_SKB_CB(skb)->control.vif = vif; 3718 3719 if (vif && 3720 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3721 bool ampdu = txq->ac != IEEE80211_AC_VO; 3722 u32 airtime; 3723 3724 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3725 skb->len, ampdu); 3726 if (airtime) { 3727 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3728 ieee80211_sta_update_pending_airtime(local, tx.sta, 3729 txq->ac, 3730 airtime, 3731 false); 3732 } 3733 } 3734 3735 return skb; 3736 3737 out: 3738 spin_unlock_bh(&fq->lock); 3739 3740 return skb; 3741 } 3742 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3743 3744 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3745 { 3746 struct ieee80211_local *local = hw_to_local(hw); 3747 struct ieee80211_txq *ret = NULL; 3748 struct txq_info *txqi = NULL, *head = NULL; 3749 bool found_eligible_txq = false; 3750 3751 spin_lock_bh(&local->active_txq_lock[ac]); 3752 3753 begin: 3754 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3755 struct txq_info, 3756 schedule_order); 3757 if (!txqi) 3758 goto out; 3759 3760 if (txqi == head) { 3761 if (!found_eligible_txq) 3762 goto out; 3763 else 3764 found_eligible_txq = false; 3765 } 3766 3767 if (!head) 3768 head = txqi; 3769 3770 if (txqi->txq.sta) { 3771 struct sta_info *sta = container_of(txqi->txq.sta, 3772 struct sta_info, sta); 3773 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3774 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3775 3776 if (aql_check) 3777 found_eligible_txq = true; 3778 3779 if (deficit < 0) 3780 sta->airtime[txqi->txq.ac].deficit += 3781 sta->airtime_weight; 3782 3783 if (deficit < 0 || !aql_check) { 3784 list_move_tail(&txqi->schedule_order, 3785 &local->active_txqs[txqi->txq.ac]); 3786 goto begin; 3787 } 3788 } 3789 3790 3791 if (txqi->schedule_round == local->schedule_round[ac]) 3792 goto out; 3793 3794 list_del_init(&txqi->schedule_order); 3795 txqi->schedule_round = local->schedule_round[ac]; 3796 ret = &txqi->txq; 3797 3798 out: 3799 spin_unlock_bh(&local->active_txq_lock[ac]); 3800 return ret; 3801 } 3802 EXPORT_SYMBOL(ieee80211_next_txq); 3803 3804 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3805 struct ieee80211_txq *txq, 3806 bool force) 3807 { 3808 struct ieee80211_local *local = hw_to_local(hw); 3809 struct txq_info *txqi = to_txq_info(txq); 3810 3811 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3812 3813 if (list_empty(&txqi->schedule_order) && 3814 (force || !skb_queue_empty(&txqi->frags) || 3815 txqi->tin.backlog_packets)) { 3816 /* If airtime accounting is active, always enqueue STAs at the 3817 * head of the list to ensure that they only get moved to the 3818 * back by the airtime DRR scheduler once they have a negative 3819 * deficit. A station that already has a negative deficit will 3820 * get immediately moved to the back of the list on the next 3821 * call to ieee80211_next_txq(). 3822 */ 3823 if (txqi->txq.sta && local->airtime_flags && 3824 wiphy_ext_feature_isset(local->hw.wiphy, 3825 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3826 list_add(&txqi->schedule_order, 3827 &local->active_txqs[txq->ac]); 3828 else 3829 list_add_tail(&txqi->schedule_order, 3830 &local->active_txqs[txq->ac]); 3831 } 3832 3833 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3834 } 3835 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3836 3837 DEFINE_STATIC_KEY_FALSE(aql_disable); 3838 3839 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3840 struct ieee80211_txq *txq) 3841 { 3842 struct sta_info *sta; 3843 struct ieee80211_local *local = hw_to_local(hw); 3844 3845 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3846 return true; 3847 3848 if (static_branch_unlikely(&aql_disable)) 3849 return true; 3850 3851 if (!txq->sta) 3852 return true; 3853 3854 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 3855 return true; 3856 3857 sta = container_of(txq->sta, struct sta_info, sta); 3858 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3859 sta->airtime[txq->ac].aql_limit_low) 3860 return true; 3861 3862 if (atomic_read(&local->aql_total_pending_airtime) < 3863 local->aql_threshold && 3864 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3865 sta->airtime[txq->ac].aql_limit_high) 3866 return true; 3867 3868 return false; 3869 } 3870 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3871 3872 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3873 struct ieee80211_txq *txq) 3874 { 3875 struct ieee80211_local *local = hw_to_local(hw); 3876 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3877 struct sta_info *sta; 3878 u8 ac = txq->ac; 3879 3880 spin_lock_bh(&local->active_txq_lock[ac]); 3881 3882 if (!txqi->txq.sta) 3883 goto out; 3884 3885 if (list_empty(&txqi->schedule_order)) 3886 goto out; 3887 3888 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3889 schedule_order) { 3890 if (iter == txqi) 3891 break; 3892 3893 if (!iter->txq.sta) { 3894 list_move_tail(&iter->schedule_order, 3895 &local->active_txqs[ac]); 3896 continue; 3897 } 3898 sta = container_of(iter->txq.sta, struct sta_info, sta); 3899 if (sta->airtime[ac].deficit < 0) 3900 sta->airtime[ac].deficit += sta->airtime_weight; 3901 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3902 } 3903 3904 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3905 if (sta->airtime[ac].deficit >= 0) 3906 goto out; 3907 3908 sta->airtime[ac].deficit += sta->airtime_weight; 3909 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3910 spin_unlock_bh(&local->active_txq_lock[ac]); 3911 3912 return false; 3913 out: 3914 if (!list_empty(&txqi->schedule_order)) 3915 list_del_init(&txqi->schedule_order); 3916 spin_unlock_bh(&local->active_txq_lock[ac]); 3917 3918 return true; 3919 } 3920 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3921 3922 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3923 { 3924 struct ieee80211_local *local = hw_to_local(hw); 3925 3926 spin_lock_bh(&local->active_txq_lock[ac]); 3927 local->schedule_round[ac]++; 3928 spin_unlock_bh(&local->active_txq_lock[ac]); 3929 } 3930 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3931 3932 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3933 struct net_device *dev, 3934 u32 info_flags, 3935 u32 ctrl_flags, 3936 u64 *cookie) 3937 { 3938 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3939 struct ieee80211_local *local = sdata->local; 3940 struct sta_info *sta; 3941 struct sk_buff *next; 3942 3943 if (unlikely(skb->len < ETH_HLEN)) { 3944 kfree_skb(skb); 3945 return; 3946 } 3947 3948 rcu_read_lock(); 3949 3950 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3951 goto out_free; 3952 3953 if (IS_ERR(sta)) 3954 sta = NULL; 3955 3956 if (local->ops->wake_tx_queue) { 3957 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3958 skb_set_queue_mapping(skb, queue); 3959 skb_get_hash(skb); 3960 } 3961 3962 if (sta) { 3963 struct ieee80211_fast_tx *fast_tx; 3964 3965 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3966 3967 fast_tx = rcu_dereference(sta->fast_tx); 3968 3969 if (fast_tx && 3970 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3971 goto out; 3972 } 3973 3974 if (skb_is_gso(skb)) { 3975 struct sk_buff *segs; 3976 3977 segs = skb_gso_segment(skb, 0); 3978 if (IS_ERR(segs)) { 3979 goto out_free; 3980 } else if (segs) { 3981 consume_skb(skb); 3982 skb = segs; 3983 } 3984 } else { 3985 /* we cannot process non-linear frames on this path */ 3986 if (skb_linearize(skb)) { 3987 kfree_skb(skb); 3988 goto out; 3989 } 3990 3991 /* the frame could be fragmented, software-encrypted, and other 3992 * things so we cannot really handle checksum offload with it - 3993 * fix it up in software before we handle anything else. 3994 */ 3995 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3996 skb_set_transport_header(skb, 3997 skb_checksum_start_offset(skb)); 3998 if (skb_checksum_help(skb)) 3999 goto out_free; 4000 } 4001 } 4002 4003 skb_list_walk_safe(skb, skb, next) { 4004 skb_mark_not_on_list(skb); 4005 4006 if (skb->protocol == sdata->control_port_protocol) 4007 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4008 4009 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4010 sta, ctrl_flags, cookie); 4011 if (IS_ERR(skb)) { 4012 kfree_skb_list(next); 4013 goto out; 4014 } 4015 4016 dev_sw_netstats_tx_add(dev, 1, skb->len); 4017 4018 ieee80211_xmit(sdata, sta, skb); 4019 } 4020 goto out; 4021 out_free: 4022 kfree_skb(skb); 4023 out: 4024 rcu_read_unlock(); 4025 } 4026 4027 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4028 { 4029 struct ethhdr *eth; 4030 int err; 4031 4032 err = skb_ensure_writable(skb, ETH_HLEN); 4033 if (unlikely(err)) 4034 return err; 4035 4036 eth = (void *)skb->data; 4037 ether_addr_copy(eth->h_dest, sta->sta.addr); 4038 4039 return 0; 4040 } 4041 4042 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4043 struct net_device *dev) 4044 { 4045 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4046 const struct ethhdr *eth = (void *)skb->data; 4047 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4048 __be16 ethertype; 4049 4050 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4051 return false; 4052 4053 switch (sdata->vif.type) { 4054 case NL80211_IFTYPE_AP_VLAN: 4055 if (sdata->u.vlan.sta) 4056 return false; 4057 if (sdata->wdev.use_4addr) 4058 return false; 4059 fallthrough; 4060 case NL80211_IFTYPE_AP: 4061 /* check runtime toggle for this bss */ 4062 if (!sdata->bss->multicast_to_unicast) 4063 return false; 4064 break; 4065 default: 4066 return false; 4067 } 4068 4069 /* multicast to unicast conversion only for some payload */ 4070 ethertype = eth->h_proto; 4071 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4072 ethertype = ethvlan->h_vlan_encapsulated_proto; 4073 switch (ethertype) { 4074 case htons(ETH_P_ARP): 4075 case htons(ETH_P_IP): 4076 case htons(ETH_P_IPV6): 4077 break; 4078 default: 4079 return false; 4080 } 4081 4082 return true; 4083 } 4084 4085 static void 4086 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4087 struct sk_buff_head *queue) 4088 { 4089 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4090 struct ieee80211_local *local = sdata->local; 4091 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4092 struct sta_info *sta, *first = NULL; 4093 struct sk_buff *cloned_skb; 4094 4095 rcu_read_lock(); 4096 4097 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4098 if (sdata != sta->sdata) 4099 /* AP-VLAN mismatch */ 4100 continue; 4101 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4102 /* do not send back to source */ 4103 continue; 4104 if (!first) { 4105 first = sta; 4106 continue; 4107 } 4108 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4109 if (!cloned_skb) 4110 goto multicast; 4111 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4112 dev_kfree_skb(cloned_skb); 4113 goto multicast; 4114 } 4115 __skb_queue_tail(queue, cloned_skb); 4116 } 4117 4118 if (likely(first)) { 4119 if (unlikely(ieee80211_change_da(skb, first))) 4120 goto multicast; 4121 __skb_queue_tail(queue, skb); 4122 } else { 4123 /* no STA connected, drop */ 4124 kfree_skb(skb); 4125 skb = NULL; 4126 } 4127 4128 goto out; 4129 multicast: 4130 __skb_queue_purge(queue); 4131 __skb_queue_tail(queue, skb); 4132 out: 4133 rcu_read_unlock(); 4134 } 4135 4136 /** 4137 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4138 * @skb: packet to be sent 4139 * @dev: incoming interface 4140 * 4141 * On failure skb will be freed. 4142 */ 4143 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4144 struct net_device *dev) 4145 { 4146 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4147 struct sk_buff_head queue; 4148 4149 __skb_queue_head_init(&queue); 4150 ieee80211_convert_to_unicast(skb, dev, &queue); 4151 while ((skb = __skb_dequeue(&queue))) 4152 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4153 } else { 4154 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4155 } 4156 4157 return NETDEV_TX_OK; 4158 } 4159 4160 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4161 struct sk_buff *skb, int led_len, 4162 struct sta_info *sta, 4163 bool txpending) 4164 { 4165 struct ieee80211_local *local = sdata->local; 4166 struct ieee80211_tx_control control = {}; 4167 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4168 struct ieee80211_sta *pubsta = NULL; 4169 unsigned long flags; 4170 int q = info->hw_queue; 4171 4172 if (sta) 4173 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4174 4175 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4176 return true; 4177 4178 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4179 4180 if (local->queue_stop_reasons[q] || 4181 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4182 if (txpending) 4183 skb_queue_head(&local->pending[q], skb); 4184 else 4185 skb_queue_tail(&local->pending[q], skb); 4186 4187 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4188 4189 return false; 4190 } 4191 4192 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4193 4194 if (sta && sta->uploaded) 4195 pubsta = &sta->sta; 4196 4197 control.sta = pubsta; 4198 4199 drv_tx(local, &control, skb); 4200 4201 return true; 4202 } 4203 4204 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4205 struct net_device *dev, struct sta_info *sta, 4206 struct ieee80211_key *key, struct sk_buff *skb) 4207 { 4208 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4209 struct ieee80211_local *local = sdata->local; 4210 struct tid_ampdu_tx *tid_tx; 4211 u8 tid; 4212 4213 if (local->ops->wake_tx_queue) { 4214 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4215 skb_set_queue_mapping(skb, queue); 4216 skb_get_hash(skb); 4217 } 4218 4219 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4220 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4221 goto out_free; 4222 4223 memset(info, 0, sizeof(*info)); 4224 4225 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4226 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4227 if (tid_tx) { 4228 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4229 /* fall back to non-offload slow path */ 4230 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4231 return; 4232 } 4233 4234 info->flags |= IEEE80211_TX_CTL_AMPDU; 4235 if (tid_tx->timeout) 4236 tid_tx->last_tx = jiffies; 4237 } 4238 4239 if (unlikely(skb->sk && 4240 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4241 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4242 &info->flags, NULL); 4243 4244 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4245 4246 dev_sw_netstats_tx_add(dev, 1, skb->len); 4247 4248 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4249 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4250 4251 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4252 sdata = container_of(sdata->bss, 4253 struct ieee80211_sub_if_data, u.ap); 4254 4255 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4256 info->control.vif = &sdata->vif; 4257 4258 if (key) 4259 info->control.hw_key = &key->conf; 4260 4261 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4262 4263 return; 4264 4265 out_free: 4266 kfree_skb(skb); 4267 } 4268 4269 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4270 struct net_device *dev) 4271 { 4272 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4273 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4274 struct ieee80211_key *key; 4275 struct sta_info *sta; 4276 4277 if (unlikely(skb->len < ETH_HLEN)) { 4278 kfree_skb(skb); 4279 return NETDEV_TX_OK; 4280 } 4281 4282 rcu_read_lock(); 4283 4284 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4285 kfree_skb(skb); 4286 goto out; 4287 } 4288 4289 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4290 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4291 sdata->control_port_protocol == ehdr->h_proto)) 4292 goto skip_offload; 4293 4294 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4295 if (!key) 4296 key = rcu_dereference(sdata->default_unicast_key); 4297 4298 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4299 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4300 goto skip_offload; 4301 4302 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4303 goto out; 4304 4305 skip_offload: 4306 ieee80211_subif_start_xmit(skb, dev); 4307 out: 4308 rcu_read_unlock(); 4309 4310 return NETDEV_TX_OK; 4311 } 4312 4313 struct sk_buff * 4314 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4315 struct sk_buff *skb, u32 info_flags) 4316 { 4317 struct ieee80211_hdr *hdr; 4318 struct ieee80211_tx_data tx = { 4319 .local = sdata->local, 4320 .sdata = sdata, 4321 }; 4322 struct sta_info *sta; 4323 4324 rcu_read_lock(); 4325 4326 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4327 kfree_skb(skb); 4328 skb = ERR_PTR(-EINVAL); 4329 goto out; 4330 } 4331 4332 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4333 if (IS_ERR(skb)) 4334 goto out; 4335 4336 hdr = (void *)skb->data; 4337 tx.sta = sta_info_get(sdata, hdr->addr1); 4338 tx.skb = skb; 4339 4340 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4341 rcu_read_unlock(); 4342 kfree_skb(skb); 4343 return ERR_PTR(-EINVAL); 4344 } 4345 4346 out: 4347 rcu_read_unlock(); 4348 return skb; 4349 } 4350 4351 /* 4352 * ieee80211_clear_tx_pending may not be called in a context where 4353 * it is possible that it packets could come in again. 4354 */ 4355 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4356 { 4357 struct sk_buff *skb; 4358 int i; 4359 4360 for (i = 0; i < local->hw.queues; i++) { 4361 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4362 ieee80211_free_txskb(&local->hw, skb); 4363 } 4364 } 4365 4366 /* 4367 * Returns false if the frame couldn't be transmitted but was queued instead, 4368 * which in this case means re-queued -- take as an indication to stop sending 4369 * more pending frames. 4370 */ 4371 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4372 struct sk_buff *skb) 4373 { 4374 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4375 struct ieee80211_sub_if_data *sdata; 4376 struct sta_info *sta; 4377 struct ieee80211_hdr *hdr; 4378 bool result; 4379 struct ieee80211_chanctx_conf *chanctx_conf; 4380 4381 sdata = vif_to_sdata(info->control.vif); 4382 4383 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4384 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4385 if (unlikely(!chanctx_conf)) { 4386 dev_kfree_skb(skb); 4387 return true; 4388 } 4389 info->band = chanctx_conf->def.chan->band; 4390 result = ieee80211_tx(sdata, NULL, skb, true); 4391 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4392 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4393 dev_kfree_skb(skb); 4394 return true; 4395 } 4396 4397 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4398 sta = NULL; 4399 4400 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4401 } else { 4402 struct sk_buff_head skbs; 4403 4404 __skb_queue_head_init(&skbs); 4405 __skb_queue_tail(&skbs, skb); 4406 4407 hdr = (struct ieee80211_hdr *)skb->data; 4408 sta = sta_info_get(sdata, hdr->addr1); 4409 4410 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4411 } 4412 4413 return result; 4414 } 4415 4416 /* 4417 * Transmit all pending packets. Called from tasklet. 4418 */ 4419 void ieee80211_tx_pending(struct tasklet_struct *t) 4420 { 4421 struct ieee80211_local *local = from_tasklet(local, t, 4422 tx_pending_tasklet); 4423 unsigned long flags; 4424 int i; 4425 bool txok; 4426 4427 rcu_read_lock(); 4428 4429 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4430 for (i = 0; i < local->hw.queues; i++) { 4431 /* 4432 * If queue is stopped by something other than due to pending 4433 * frames, or we have no pending frames, proceed to next queue. 4434 */ 4435 if (local->queue_stop_reasons[i] || 4436 skb_queue_empty(&local->pending[i])) 4437 continue; 4438 4439 while (!skb_queue_empty(&local->pending[i])) { 4440 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4441 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4442 4443 if (WARN_ON(!info->control.vif)) { 4444 ieee80211_free_txskb(&local->hw, skb); 4445 continue; 4446 } 4447 4448 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4449 flags); 4450 4451 txok = ieee80211_tx_pending_skb(local, skb); 4452 spin_lock_irqsave(&local->queue_stop_reason_lock, 4453 flags); 4454 if (!txok) 4455 break; 4456 } 4457 4458 if (skb_queue_empty(&local->pending[i])) 4459 ieee80211_propagate_queue_wake(local, i); 4460 } 4461 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4462 4463 rcu_read_unlock(); 4464 } 4465 4466 /* functions for drivers to get certain frames */ 4467 4468 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4469 struct ps_data *ps, struct sk_buff *skb, 4470 bool is_template) 4471 { 4472 u8 *pos, *tim; 4473 int aid0 = 0; 4474 int i, have_bits = 0, n1, n2; 4475 4476 /* Generate bitmap for TIM only if there are any STAs in power save 4477 * mode. */ 4478 if (atomic_read(&ps->num_sta_ps) > 0) 4479 /* in the hope that this is faster than 4480 * checking byte-for-byte */ 4481 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4482 IEEE80211_MAX_AID+1); 4483 if (!is_template) { 4484 if (ps->dtim_count == 0) 4485 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4486 else 4487 ps->dtim_count--; 4488 } 4489 4490 tim = pos = skb_put(skb, 6); 4491 *pos++ = WLAN_EID_TIM; 4492 *pos++ = 4; 4493 *pos++ = ps->dtim_count; 4494 *pos++ = sdata->vif.bss_conf.dtim_period; 4495 4496 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4497 aid0 = 1; 4498 4499 ps->dtim_bc_mc = aid0 == 1; 4500 4501 if (have_bits) { 4502 /* Find largest even number N1 so that bits numbered 1 through 4503 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4504 * (N2 + 1) x 8 through 2007 are 0. */ 4505 n1 = 0; 4506 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4507 if (ps->tim[i]) { 4508 n1 = i & 0xfe; 4509 break; 4510 } 4511 } 4512 n2 = n1; 4513 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4514 if (ps->tim[i]) { 4515 n2 = i; 4516 break; 4517 } 4518 } 4519 4520 /* Bitmap control */ 4521 *pos++ = n1 | aid0; 4522 /* Part Virt Bitmap */ 4523 skb_put(skb, n2 - n1); 4524 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4525 4526 tim[1] = n2 - n1 + 4; 4527 } else { 4528 *pos++ = aid0; /* Bitmap control */ 4529 *pos++ = 0; /* Part Virt Bitmap */ 4530 } 4531 } 4532 4533 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4534 struct ps_data *ps, struct sk_buff *skb, 4535 bool is_template) 4536 { 4537 struct ieee80211_local *local = sdata->local; 4538 4539 /* 4540 * Not very nice, but we want to allow the driver to call 4541 * ieee80211_beacon_get() as a response to the set_tim() 4542 * callback. That, however, is already invoked under the 4543 * sta_lock to guarantee consistent and race-free update 4544 * of the tim bitmap in mac80211 and the driver. 4545 */ 4546 if (local->tim_in_locked_section) { 4547 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4548 } else { 4549 spin_lock_bh(&local->tim_lock); 4550 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4551 spin_unlock_bh(&local->tim_lock); 4552 } 4553 4554 return 0; 4555 } 4556 4557 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4558 struct beacon_data *beacon) 4559 { 4560 struct probe_resp *resp; 4561 u8 *beacon_data; 4562 size_t beacon_data_len; 4563 int i; 4564 u8 count = beacon->cntdwn_current_counter; 4565 4566 switch (sdata->vif.type) { 4567 case NL80211_IFTYPE_AP: 4568 beacon_data = beacon->tail; 4569 beacon_data_len = beacon->tail_len; 4570 break; 4571 case NL80211_IFTYPE_ADHOC: 4572 beacon_data = beacon->head; 4573 beacon_data_len = beacon->head_len; 4574 break; 4575 case NL80211_IFTYPE_MESH_POINT: 4576 beacon_data = beacon->head; 4577 beacon_data_len = beacon->head_len; 4578 break; 4579 default: 4580 return; 4581 } 4582 4583 rcu_read_lock(); 4584 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4585 resp = rcu_dereference(sdata->u.ap.probe_resp); 4586 4587 if (beacon->cntdwn_counter_offsets[i]) { 4588 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4589 beacon_data_len)) { 4590 rcu_read_unlock(); 4591 return; 4592 } 4593 4594 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4595 } 4596 4597 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4598 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4599 } 4600 rcu_read_unlock(); 4601 } 4602 4603 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4604 { 4605 beacon->cntdwn_current_counter--; 4606 4607 /* the counter should never reach 0 */ 4608 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4609 4610 return beacon->cntdwn_current_counter; 4611 } 4612 4613 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4614 { 4615 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4616 struct beacon_data *beacon = NULL; 4617 u8 count = 0; 4618 4619 rcu_read_lock(); 4620 4621 if (sdata->vif.type == NL80211_IFTYPE_AP) 4622 beacon = rcu_dereference(sdata->u.ap.beacon); 4623 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4624 beacon = rcu_dereference(sdata->u.ibss.presp); 4625 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4626 beacon = rcu_dereference(sdata->u.mesh.beacon); 4627 4628 if (!beacon) 4629 goto unlock; 4630 4631 count = __ieee80211_beacon_update_cntdwn(beacon); 4632 4633 unlock: 4634 rcu_read_unlock(); 4635 return count; 4636 } 4637 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4638 4639 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4640 { 4641 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4642 struct beacon_data *beacon = NULL; 4643 4644 rcu_read_lock(); 4645 4646 if (sdata->vif.type == NL80211_IFTYPE_AP) 4647 beacon = rcu_dereference(sdata->u.ap.beacon); 4648 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4649 beacon = rcu_dereference(sdata->u.ibss.presp); 4650 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4651 beacon = rcu_dereference(sdata->u.mesh.beacon); 4652 4653 if (!beacon) 4654 goto unlock; 4655 4656 if (counter < beacon->cntdwn_current_counter) 4657 beacon->cntdwn_current_counter = counter; 4658 4659 unlock: 4660 rcu_read_unlock(); 4661 } 4662 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4663 4664 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4665 { 4666 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4667 struct beacon_data *beacon = NULL; 4668 u8 *beacon_data; 4669 size_t beacon_data_len; 4670 int ret = false; 4671 4672 if (!ieee80211_sdata_running(sdata)) 4673 return false; 4674 4675 rcu_read_lock(); 4676 if (vif->type == NL80211_IFTYPE_AP) { 4677 struct ieee80211_if_ap *ap = &sdata->u.ap; 4678 4679 beacon = rcu_dereference(ap->beacon); 4680 if (WARN_ON(!beacon || !beacon->tail)) 4681 goto out; 4682 beacon_data = beacon->tail; 4683 beacon_data_len = beacon->tail_len; 4684 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4685 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4686 4687 beacon = rcu_dereference(ifibss->presp); 4688 if (!beacon) 4689 goto out; 4690 4691 beacon_data = beacon->head; 4692 beacon_data_len = beacon->head_len; 4693 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4694 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4695 4696 beacon = rcu_dereference(ifmsh->beacon); 4697 if (!beacon) 4698 goto out; 4699 4700 beacon_data = beacon->head; 4701 beacon_data_len = beacon->head_len; 4702 } else { 4703 WARN_ON(1); 4704 goto out; 4705 } 4706 4707 if (!beacon->cntdwn_counter_offsets[0]) 4708 goto out; 4709 4710 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4711 goto out; 4712 4713 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4714 ret = true; 4715 4716 out: 4717 rcu_read_unlock(); 4718 4719 return ret; 4720 } 4721 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4722 4723 static int ieee80211_beacon_protect(struct sk_buff *skb, 4724 struct ieee80211_local *local, 4725 struct ieee80211_sub_if_data *sdata) 4726 { 4727 ieee80211_tx_result res; 4728 struct ieee80211_tx_data tx; 4729 struct sk_buff *check_skb; 4730 4731 memset(&tx, 0, sizeof(tx)); 4732 tx.key = rcu_dereference(sdata->default_beacon_key); 4733 if (!tx.key) 4734 return 0; 4735 tx.local = local; 4736 tx.sdata = sdata; 4737 __skb_queue_head_init(&tx.skbs); 4738 __skb_queue_tail(&tx.skbs, skb); 4739 res = ieee80211_tx_h_encrypt(&tx); 4740 check_skb = __skb_dequeue(&tx.skbs); 4741 /* we may crash after this, but it'd be a bug in crypto */ 4742 WARN_ON(check_skb != skb); 4743 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4744 return -EINVAL; 4745 4746 return 0; 4747 } 4748 4749 static struct sk_buff * 4750 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4751 struct ieee80211_vif *vif, 4752 struct ieee80211_mutable_offsets *offs, 4753 bool is_template) 4754 { 4755 struct ieee80211_local *local = hw_to_local(hw); 4756 struct beacon_data *beacon = NULL; 4757 struct sk_buff *skb = NULL; 4758 struct ieee80211_tx_info *info; 4759 struct ieee80211_sub_if_data *sdata = NULL; 4760 enum nl80211_band band; 4761 struct ieee80211_tx_rate_control txrc; 4762 struct ieee80211_chanctx_conf *chanctx_conf; 4763 int csa_off_base = 0; 4764 4765 rcu_read_lock(); 4766 4767 sdata = vif_to_sdata(vif); 4768 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4769 4770 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4771 goto out; 4772 4773 if (offs) 4774 memset(offs, 0, sizeof(*offs)); 4775 4776 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4777 struct ieee80211_if_ap *ap = &sdata->u.ap; 4778 4779 beacon = rcu_dereference(ap->beacon); 4780 if (beacon) { 4781 if (beacon->cntdwn_counter_offsets[0]) { 4782 if (!is_template) 4783 ieee80211_beacon_update_cntdwn(vif); 4784 4785 ieee80211_set_beacon_cntdwn(sdata, beacon); 4786 } 4787 4788 /* 4789 * headroom, head length, 4790 * tail length and maximum TIM length 4791 */ 4792 skb = dev_alloc_skb(local->tx_headroom + 4793 beacon->head_len + 4794 beacon->tail_len + 256 + 4795 local->hw.extra_beacon_tailroom); 4796 if (!skb) 4797 goto out; 4798 4799 skb_reserve(skb, local->tx_headroom); 4800 skb_put_data(skb, beacon->head, beacon->head_len); 4801 4802 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4803 is_template); 4804 4805 if (offs) { 4806 offs->tim_offset = beacon->head_len; 4807 offs->tim_length = skb->len - beacon->head_len; 4808 4809 /* for AP the csa offsets are from tail */ 4810 csa_off_base = skb->len; 4811 } 4812 4813 if (beacon->tail) 4814 skb_put_data(skb, beacon->tail, 4815 beacon->tail_len); 4816 4817 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4818 goto out; 4819 } else 4820 goto out; 4821 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4822 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4823 struct ieee80211_hdr *hdr; 4824 4825 beacon = rcu_dereference(ifibss->presp); 4826 if (!beacon) 4827 goto out; 4828 4829 if (beacon->cntdwn_counter_offsets[0]) { 4830 if (!is_template) 4831 __ieee80211_beacon_update_cntdwn(beacon); 4832 4833 ieee80211_set_beacon_cntdwn(sdata, beacon); 4834 } 4835 4836 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4837 local->hw.extra_beacon_tailroom); 4838 if (!skb) 4839 goto out; 4840 skb_reserve(skb, local->tx_headroom); 4841 skb_put_data(skb, beacon->head, beacon->head_len); 4842 4843 hdr = (struct ieee80211_hdr *) skb->data; 4844 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4845 IEEE80211_STYPE_BEACON); 4846 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4847 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4848 4849 beacon = rcu_dereference(ifmsh->beacon); 4850 if (!beacon) 4851 goto out; 4852 4853 if (beacon->cntdwn_counter_offsets[0]) { 4854 if (!is_template) 4855 /* TODO: For mesh csa_counter is in TU, so 4856 * decrementing it by one isn't correct, but 4857 * for now we leave it consistent with overall 4858 * mac80211's behavior. 4859 */ 4860 __ieee80211_beacon_update_cntdwn(beacon); 4861 4862 ieee80211_set_beacon_cntdwn(sdata, beacon); 4863 } 4864 4865 if (ifmsh->sync_ops) 4866 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4867 4868 skb = dev_alloc_skb(local->tx_headroom + 4869 beacon->head_len + 4870 256 + /* TIM IE */ 4871 beacon->tail_len + 4872 local->hw.extra_beacon_tailroom); 4873 if (!skb) 4874 goto out; 4875 skb_reserve(skb, local->tx_headroom); 4876 skb_put_data(skb, beacon->head, beacon->head_len); 4877 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4878 4879 if (offs) { 4880 offs->tim_offset = beacon->head_len; 4881 offs->tim_length = skb->len - beacon->head_len; 4882 } 4883 4884 skb_put_data(skb, beacon->tail, beacon->tail_len); 4885 } else { 4886 WARN_ON(1); 4887 goto out; 4888 } 4889 4890 /* CSA offsets */ 4891 if (offs && beacon) { 4892 int i; 4893 4894 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4895 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 4896 4897 if (!csa_off) 4898 continue; 4899 4900 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 4901 } 4902 } 4903 4904 band = chanctx_conf->def.chan->band; 4905 4906 info = IEEE80211_SKB_CB(skb); 4907 4908 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4909 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4910 info->band = band; 4911 4912 memset(&txrc, 0, sizeof(txrc)); 4913 txrc.hw = hw; 4914 txrc.sband = local->hw.wiphy->bands[band]; 4915 txrc.bss_conf = &sdata->vif.bss_conf; 4916 txrc.skb = skb; 4917 txrc.reported_rate.idx = -1; 4918 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4919 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4920 else 4921 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4922 txrc.bss = true; 4923 rate_control_get_rate(sdata, NULL, &txrc); 4924 4925 info->control.vif = vif; 4926 4927 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4928 IEEE80211_TX_CTL_ASSIGN_SEQ | 4929 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4930 out: 4931 rcu_read_unlock(); 4932 return skb; 4933 4934 } 4935 4936 struct sk_buff * 4937 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4938 struct ieee80211_vif *vif, 4939 struct ieee80211_mutable_offsets *offs) 4940 { 4941 return __ieee80211_beacon_get(hw, vif, offs, true); 4942 } 4943 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4944 4945 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4946 struct ieee80211_vif *vif, 4947 u16 *tim_offset, u16 *tim_length) 4948 { 4949 struct ieee80211_mutable_offsets offs = {}; 4950 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4951 struct sk_buff *copy; 4952 struct ieee80211_supported_band *sband; 4953 int shift; 4954 4955 if (!bcn) 4956 return bcn; 4957 4958 if (tim_offset) 4959 *tim_offset = offs.tim_offset; 4960 4961 if (tim_length) 4962 *tim_length = offs.tim_length; 4963 4964 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4965 !hw_to_local(hw)->monitors) 4966 return bcn; 4967 4968 /* send a copy to monitor interfaces */ 4969 copy = skb_copy(bcn, GFP_ATOMIC); 4970 if (!copy) 4971 return bcn; 4972 4973 shift = ieee80211_vif_get_shift(vif); 4974 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4975 if (!sband) 4976 return bcn; 4977 4978 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4979 NULL); 4980 4981 return bcn; 4982 } 4983 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4984 4985 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4986 struct ieee80211_vif *vif) 4987 { 4988 struct ieee80211_if_ap *ap = NULL; 4989 struct sk_buff *skb = NULL; 4990 struct probe_resp *presp = NULL; 4991 struct ieee80211_hdr *hdr; 4992 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4993 4994 if (sdata->vif.type != NL80211_IFTYPE_AP) 4995 return NULL; 4996 4997 rcu_read_lock(); 4998 4999 ap = &sdata->u.ap; 5000 presp = rcu_dereference(ap->probe_resp); 5001 if (!presp) 5002 goto out; 5003 5004 skb = dev_alloc_skb(presp->len); 5005 if (!skb) 5006 goto out; 5007 5008 skb_put_data(skb, presp->data, presp->len); 5009 5010 hdr = (struct ieee80211_hdr *) skb->data; 5011 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5012 5013 out: 5014 rcu_read_unlock(); 5015 return skb; 5016 } 5017 EXPORT_SYMBOL(ieee80211_proberesp_get); 5018 5019 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5020 struct ieee80211_vif *vif) 5021 { 5022 struct sk_buff *skb = NULL; 5023 struct fils_discovery_data *tmpl = NULL; 5024 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5025 5026 if (sdata->vif.type != NL80211_IFTYPE_AP) 5027 return NULL; 5028 5029 rcu_read_lock(); 5030 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5031 if (!tmpl) { 5032 rcu_read_unlock(); 5033 return NULL; 5034 } 5035 5036 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5037 if (skb) { 5038 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5039 skb_put_data(skb, tmpl->data, tmpl->len); 5040 } 5041 5042 rcu_read_unlock(); 5043 return skb; 5044 } 5045 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5046 5047 struct sk_buff * 5048 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5049 struct ieee80211_vif *vif) 5050 { 5051 struct sk_buff *skb = NULL; 5052 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5053 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5054 5055 if (sdata->vif.type != NL80211_IFTYPE_AP) 5056 return NULL; 5057 5058 rcu_read_lock(); 5059 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5060 if (!tmpl) { 5061 rcu_read_unlock(); 5062 return NULL; 5063 } 5064 5065 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5066 if (skb) { 5067 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5068 skb_put_data(skb, tmpl->data, tmpl->len); 5069 } 5070 5071 rcu_read_unlock(); 5072 return skb; 5073 } 5074 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5075 5076 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5077 struct ieee80211_vif *vif) 5078 { 5079 struct ieee80211_sub_if_data *sdata; 5080 struct ieee80211_if_managed *ifmgd; 5081 struct ieee80211_pspoll *pspoll; 5082 struct ieee80211_local *local; 5083 struct sk_buff *skb; 5084 5085 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5086 return NULL; 5087 5088 sdata = vif_to_sdata(vif); 5089 ifmgd = &sdata->u.mgd; 5090 local = sdata->local; 5091 5092 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5093 if (!skb) 5094 return NULL; 5095 5096 skb_reserve(skb, local->hw.extra_tx_headroom); 5097 5098 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5099 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5100 IEEE80211_STYPE_PSPOLL); 5101 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5102 5103 /* aid in PS-Poll has its two MSBs each set to 1 */ 5104 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5105 5106 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5107 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5108 5109 return skb; 5110 } 5111 EXPORT_SYMBOL(ieee80211_pspoll_get); 5112 5113 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5114 struct ieee80211_vif *vif, 5115 bool qos_ok) 5116 { 5117 struct ieee80211_hdr_3addr *nullfunc; 5118 struct ieee80211_sub_if_data *sdata; 5119 struct ieee80211_if_managed *ifmgd; 5120 struct ieee80211_local *local; 5121 struct sk_buff *skb; 5122 bool qos = false; 5123 5124 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5125 return NULL; 5126 5127 sdata = vif_to_sdata(vif); 5128 ifmgd = &sdata->u.mgd; 5129 local = sdata->local; 5130 5131 if (qos_ok) { 5132 struct sta_info *sta; 5133 5134 rcu_read_lock(); 5135 sta = sta_info_get(sdata, ifmgd->bssid); 5136 qos = sta && sta->sta.wme; 5137 rcu_read_unlock(); 5138 } 5139 5140 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5141 sizeof(*nullfunc) + 2); 5142 if (!skb) 5143 return NULL; 5144 5145 skb_reserve(skb, local->hw.extra_tx_headroom); 5146 5147 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5148 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5149 IEEE80211_STYPE_NULLFUNC | 5150 IEEE80211_FCTL_TODS); 5151 if (qos) { 5152 __le16 qoshdr = cpu_to_le16(7); 5153 5154 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5155 IEEE80211_STYPE_NULLFUNC) != 5156 IEEE80211_STYPE_QOS_NULLFUNC); 5157 nullfunc->frame_control |= 5158 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5159 skb->priority = 7; 5160 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5161 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5162 } 5163 5164 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5165 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5166 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5167 5168 return skb; 5169 } 5170 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5171 5172 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5173 const u8 *src_addr, 5174 const u8 *ssid, size_t ssid_len, 5175 size_t tailroom) 5176 { 5177 struct ieee80211_local *local = hw_to_local(hw); 5178 struct ieee80211_hdr_3addr *hdr; 5179 struct sk_buff *skb; 5180 size_t ie_ssid_len; 5181 u8 *pos; 5182 5183 ie_ssid_len = 2 + ssid_len; 5184 5185 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5186 ie_ssid_len + tailroom); 5187 if (!skb) 5188 return NULL; 5189 5190 skb_reserve(skb, local->hw.extra_tx_headroom); 5191 5192 hdr = skb_put_zero(skb, sizeof(*hdr)); 5193 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5194 IEEE80211_STYPE_PROBE_REQ); 5195 eth_broadcast_addr(hdr->addr1); 5196 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5197 eth_broadcast_addr(hdr->addr3); 5198 5199 pos = skb_put(skb, ie_ssid_len); 5200 *pos++ = WLAN_EID_SSID; 5201 *pos++ = ssid_len; 5202 if (ssid_len) 5203 memcpy(pos, ssid, ssid_len); 5204 pos += ssid_len; 5205 5206 return skb; 5207 } 5208 EXPORT_SYMBOL(ieee80211_probereq_get); 5209 5210 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5211 const void *frame, size_t frame_len, 5212 const struct ieee80211_tx_info *frame_txctl, 5213 struct ieee80211_rts *rts) 5214 { 5215 const struct ieee80211_hdr *hdr = frame; 5216 5217 rts->frame_control = 5218 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5219 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5220 frame_txctl); 5221 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5222 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5223 } 5224 EXPORT_SYMBOL(ieee80211_rts_get); 5225 5226 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5227 const void *frame, size_t frame_len, 5228 const struct ieee80211_tx_info *frame_txctl, 5229 struct ieee80211_cts *cts) 5230 { 5231 const struct ieee80211_hdr *hdr = frame; 5232 5233 cts->frame_control = 5234 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5235 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5236 frame_len, frame_txctl); 5237 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5238 } 5239 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5240 5241 struct sk_buff * 5242 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5243 struct ieee80211_vif *vif) 5244 { 5245 struct ieee80211_local *local = hw_to_local(hw); 5246 struct sk_buff *skb = NULL; 5247 struct ieee80211_tx_data tx; 5248 struct ieee80211_sub_if_data *sdata; 5249 struct ps_data *ps; 5250 struct ieee80211_tx_info *info; 5251 struct ieee80211_chanctx_conf *chanctx_conf; 5252 5253 sdata = vif_to_sdata(vif); 5254 5255 rcu_read_lock(); 5256 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5257 5258 if (!chanctx_conf) 5259 goto out; 5260 5261 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5262 struct beacon_data *beacon = 5263 rcu_dereference(sdata->u.ap.beacon); 5264 5265 if (!beacon || !beacon->head) 5266 goto out; 5267 5268 ps = &sdata->u.ap.ps; 5269 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5270 ps = &sdata->u.mesh.ps; 5271 } else { 5272 goto out; 5273 } 5274 5275 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5276 goto out; /* send buffered bc/mc only after DTIM beacon */ 5277 5278 while (1) { 5279 skb = skb_dequeue(&ps->bc_buf); 5280 if (!skb) 5281 goto out; 5282 local->total_ps_buffered--; 5283 5284 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5285 struct ieee80211_hdr *hdr = 5286 (struct ieee80211_hdr *) skb->data; 5287 /* more buffered multicast/broadcast frames ==> set 5288 * MoreData flag in IEEE 802.11 header to inform PS 5289 * STAs */ 5290 hdr->frame_control |= 5291 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5292 } 5293 5294 if (sdata->vif.type == NL80211_IFTYPE_AP) 5295 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5296 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5297 break; 5298 ieee80211_free_txskb(hw, skb); 5299 } 5300 5301 info = IEEE80211_SKB_CB(skb); 5302 5303 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5304 info->band = chanctx_conf->def.chan->band; 5305 5306 if (invoke_tx_handlers(&tx)) 5307 skb = NULL; 5308 out: 5309 rcu_read_unlock(); 5310 5311 return skb; 5312 } 5313 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5314 5315 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5316 { 5317 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5318 struct ieee80211_sub_if_data *sdata = sta->sdata; 5319 struct ieee80211_local *local = sdata->local; 5320 int ret; 5321 u32 queues; 5322 5323 lockdep_assert_held(&local->sta_mtx); 5324 5325 /* only some cases are supported right now */ 5326 switch (sdata->vif.type) { 5327 case NL80211_IFTYPE_STATION: 5328 case NL80211_IFTYPE_AP: 5329 case NL80211_IFTYPE_AP_VLAN: 5330 break; 5331 default: 5332 WARN_ON(1); 5333 return -EINVAL; 5334 } 5335 5336 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5337 return -EINVAL; 5338 5339 if (sta->reserved_tid == tid) { 5340 ret = 0; 5341 goto out; 5342 } 5343 5344 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5345 sdata_err(sdata, "TID reservation already active\n"); 5346 ret = -EALREADY; 5347 goto out; 5348 } 5349 5350 ieee80211_stop_vif_queues(sdata->local, sdata, 5351 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5352 5353 synchronize_net(); 5354 5355 /* Tear down BA sessions so we stop aggregating on this TID */ 5356 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5357 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5358 __ieee80211_stop_tx_ba_session(sta, tid, 5359 AGG_STOP_LOCAL_REQUEST); 5360 } 5361 5362 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5363 __ieee80211_flush_queues(local, sdata, queues, false); 5364 5365 sta->reserved_tid = tid; 5366 5367 ieee80211_wake_vif_queues(local, sdata, 5368 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5369 5370 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5371 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5372 5373 ret = 0; 5374 out: 5375 return ret; 5376 } 5377 EXPORT_SYMBOL(ieee80211_reserve_tid); 5378 5379 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5380 { 5381 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5382 struct ieee80211_sub_if_data *sdata = sta->sdata; 5383 5384 lockdep_assert_held(&sdata->local->sta_mtx); 5385 5386 /* only some cases are supported right now */ 5387 switch (sdata->vif.type) { 5388 case NL80211_IFTYPE_STATION: 5389 case NL80211_IFTYPE_AP: 5390 case NL80211_IFTYPE_AP_VLAN: 5391 break; 5392 default: 5393 WARN_ON(1); 5394 return; 5395 } 5396 5397 if (tid != sta->reserved_tid) { 5398 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5399 return; 5400 } 5401 5402 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5403 } 5404 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5405 5406 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5407 struct sk_buff *skb, int tid, 5408 enum nl80211_band band) 5409 { 5410 int ac = ieee80211_ac_from_tid(tid); 5411 5412 skb_reset_mac_header(skb); 5413 skb_set_queue_mapping(skb, ac); 5414 skb->priority = tid; 5415 5416 skb->dev = sdata->dev; 5417 5418 /* 5419 * The other path calling ieee80211_xmit is from the tasklet, 5420 * and while we can handle concurrent transmissions locking 5421 * requirements are that we do not come into tx with bhs on. 5422 */ 5423 local_bh_disable(); 5424 IEEE80211_SKB_CB(skb)->band = band; 5425 ieee80211_xmit(sdata, NULL, skb); 5426 local_bh_enable(); 5427 } 5428 5429 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5430 const u8 *buf, size_t len, 5431 const u8 *dest, __be16 proto, bool unencrypted, 5432 u64 *cookie) 5433 { 5434 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5435 struct ieee80211_local *local = sdata->local; 5436 struct sta_info *sta; 5437 struct sk_buff *skb; 5438 struct ethhdr *ehdr; 5439 u32 ctrl_flags = 0; 5440 u32 flags = 0; 5441 5442 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5443 * or Pre-Authentication 5444 */ 5445 if (proto != sdata->control_port_protocol && 5446 proto != cpu_to_be16(ETH_P_PREAUTH)) 5447 return -EINVAL; 5448 5449 if (proto == sdata->control_port_protocol) 5450 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5451 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5452 5453 if (unencrypted) 5454 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5455 5456 if (cookie) 5457 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5458 5459 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5460 5461 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5462 sizeof(struct ethhdr) + len); 5463 if (!skb) 5464 return -ENOMEM; 5465 5466 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5467 5468 skb_put_data(skb, buf, len); 5469 5470 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5471 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5472 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5473 ehdr->h_proto = proto; 5474 5475 skb->dev = dev; 5476 skb->protocol = proto; 5477 skb_reset_network_header(skb); 5478 skb_reset_mac_header(skb); 5479 5480 /* update QoS header to prioritize control port frames if possible, 5481 * priorization also happens for control port frames send over 5482 * AF_PACKET 5483 */ 5484 rcu_read_lock(); 5485 5486 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5487 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5488 5489 skb_set_queue_mapping(skb, queue); 5490 skb_get_hash(skb); 5491 } 5492 5493 rcu_read_unlock(); 5494 5495 /* mutex lock is only needed for incrementing the cookie counter */ 5496 mutex_lock(&local->mtx); 5497 5498 local_bh_disable(); 5499 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5500 local_bh_enable(); 5501 5502 mutex_unlock(&local->mtx); 5503 5504 return 0; 5505 } 5506 5507 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5508 const u8 *buf, size_t len) 5509 { 5510 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5511 struct ieee80211_local *local = sdata->local; 5512 struct sk_buff *skb; 5513 5514 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5515 30 + /* header size */ 5516 18); /* 11s header size */ 5517 if (!skb) 5518 return -ENOMEM; 5519 5520 skb_reserve(skb, local->hw.extra_tx_headroom); 5521 skb_put_data(skb, buf, len); 5522 5523 skb->dev = dev; 5524 skb->protocol = htons(ETH_P_802_3); 5525 skb_reset_network_header(skb); 5526 skb_reset_mac_header(skb); 5527 5528 local_bh_disable(); 5529 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5530 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5531 NULL); 5532 local_bh_enable(); 5533 5534 return 0; 5535 } 5536