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) 2018-2020 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 fq_tin_enqueue(fq, tin, flow_idx, skb, 1392 fq_skb_free_func); 1393 spin_unlock_bh(&fq->lock); 1394 } 1395 1396 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1397 struct fq_flow *flow, struct sk_buff *skb, 1398 void *data) 1399 { 1400 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1401 1402 return info->control.vif == data; 1403 } 1404 1405 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1406 struct ieee80211_sub_if_data *sdata) 1407 { 1408 struct fq *fq = &local->fq; 1409 struct txq_info *txqi; 1410 struct fq_tin *tin; 1411 struct ieee80211_sub_if_data *ap; 1412 1413 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1414 return; 1415 1416 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1417 1418 if (!ap->vif.txq) 1419 return; 1420 1421 txqi = to_txq_info(ap->vif.txq); 1422 tin = &txqi->tin; 1423 1424 spin_lock_bh(&fq->lock); 1425 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1426 fq_skb_free_func); 1427 spin_unlock_bh(&fq->lock); 1428 } 1429 1430 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1431 struct sta_info *sta, 1432 struct txq_info *txqi, int tid) 1433 { 1434 fq_tin_init(&txqi->tin); 1435 codel_vars_init(&txqi->def_cvars); 1436 codel_stats_init(&txqi->cstats); 1437 __skb_queue_head_init(&txqi->frags); 1438 INIT_LIST_HEAD(&txqi->schedule_order); 1439 1440 txqi->txq.vif = &sdata->vif; 1441 1442 if (!sta) { 1443 sdata->vif.txq = &txqi->txq; 1444 txqi->txq.tid = 0; 1445 txqi->txq.ac = IEEE80211_AC_BE; 1446 1447 return; 1448 } 1449 1450 if (tid == IEEE80211_NUM_TIDS) { 1451 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1452 /* Drivers need to opt in to the management MPDU TXQ */ 1453 if (!ieee80211_hw_check(&sdata->local->hw, 1454 STA_MMPDU_TXQ)) 1455 return; 1456 } else if (!ieee80211_hw_check(&sdata->local->hw, 1457 BUFF_MMPDU_TXQ)) { 1458 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1459 return; 1460 } 1461 txqi->txq.ac = IEEE80211_AC_VO; 1462 } else { 1463 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1464 } 1465 1466 txqi->txq.sta = &sta->sta; 1467 txqi->txq.tid = tid; 1468 sta->sta.txq[tid] = &txqi->txq; 1469 } 1470 1471 void ieee80211_txq_purge(struct ieee80211_local *local, 1472 struct txq_info *txqi) 1473 { 1474 struct fq *fq = &local->fq; 1475 struct fq_tin *tin = &txqi->tin; 1476 1477 spin_lock_bh(&fq->lock); 1478 fq_tin_reset(fq, tin, fq_skb_free_func); 1479 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1480 spin_unlock_bh(&fq->lock); 1481 1482 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1483 list_del_init(&txqi->schedule_order); 1484 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1485 } 1486 1487 void ieee80211_txq_set_params(struct ieee80211_local *local) 1488 { 1489 if (local->hw.wiphy->txq_limit) 1490 local->fq.limit = local->hw.wiphy->txq_limit; 1491 else 1492 local->hw.wiphy->txq_limit = local->fq.limit; 1493 1494 if (local->hw.wiphy->txq_memory_limit) 1495 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1496 else 1497 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1498 1499 if (local->hw.wiphy->txq_quantum) 1500 local->fq.quantum = local->hw.wiphy->txq_quantum; 1501 else 1502 local->hw.wiphy->txq_quantum = local->fq.quantum; 1503 } 1504 1505 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1506 { 1507 struct fq *fq = &local->fq; 1508 int ret; 1509 int i; 1510 bool supp_vht = false; 1511 enum nl80211_band band; 1512 1513 if (!local->ops->wake_tx_queue) 1514 return 0; 1515 1516 ret = fq_init(fq, 4096); 1517 if (ret) 1518 return ret; 1519 1520 /* 1521 * If the hardware doesn't support VHT, it is safe to limit the maximum 1522 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1523 */ 1524 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1525 struct ieee80211_supported_band *sband; 1526 1527 sband = local->hw.wiphy->bands[band]; 1528 if (!sband) 1529 continue; 1530 1531 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1532 } 1533 1534 if (!supp_vht) 1535 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1536 1537 codel_params_init(&local->cparams); 1538 local->cparams.interval = MS2TIME(100); 1539 local->cparams.target = MS2TIME(20); 1540 local->cparams.ecn = true; 1541 1542 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1543 GFP_KERNEL); 1544 if (!local->cvars) { 1545 spin_lock_bh(&fq->lock); 1546 fq_reset(fq, fq_skb_free_func); 1547 spin_unlock_bh(&fq->lock); 1548 return -ENOMEM; 1549 } 1550 1551 for (i = 0; i < fq->flows_cnt; i++) 1552 codel_vars_init(&local->cvars[i]); 1553 1554 ieee80211_txq_set_params(local); 1555 1556 return 0; 1557 } 1558 1559 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1560 { 1561 struct fq *fq = &local->fq; 1562 1563 if (!local->ops->wake_tx_queue) 1564 return; 1565 1566 kfree(local->cvars); 1567 local->cvars = NULL; 1568 1569 spin_lock_bh(&fq->lock); 1570 fq_reset(fq, fq_skb_free_func); 1571 spin_unlock_bh(&fq->lock); 1572 } 1573 1574 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1575 struct ieee80211_sub_if_data *sdata, 1576 struct sta_info *sta, 1577 struct sk_buff *skb) 1578 { 1579 struct ieee80211_vif *vif; 1580 struct txq_info *txqi; 1581 1582 if (!local->ops->wake_tx_queue || 1583 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1584 return false; 1585 1586 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1587 sdata = container_of(sdata->bss, 1588 struct ieee80211_sub_if_data, u.ap); 1589 1590 vif = &sdata->vif; 1591 txqi = ieee80211_get_txq(local, vif, sta, skb); 1592 1593 if (!txqi) 1594 return false; 1595 1596 ieee80211_txq_enqueue(local, txqi, skb); 1597 1598 schedule_and_wake_txq(local, txqi); 1599 1600 return true; 1601 } 1602 1603 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1604 struct ieee80211_vif *vif, 1605 struct sta_info *sta, 1606 struct sk_buff_head *skbs, 1607 bool txpending) 1608 { 1609 struct ieee80211_tx_control control = {}; 1610 struct sk_buff *skb, *tmp; 1611 unsigned long flags; 1612 1613 skb_queue_walk_safe(skbs, skb, tmp) { 1614 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1615 int q = info->hw_queue; 1616 1617 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1618 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1619 __skb_unlink(skb, skbs); 1620 ieee80211_free_txskb(&local->hw, skb); 1621 continue; 1622 } 1623 #endif 1624 1625 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1626 if (local->queue_stop_reasons[q] || 1627 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1628 if (unlikely(info->flags & 1629 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1630 if (local->queue_stop_reasons[q] & 1631 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1632 /* 1633 * Drop off-channel frames if queues 1634 * are stopped for any reason other 1635 * than off-channel operation. Never 1636 * queue them. 1637 */ 1638 spin_unlock_irqrestore( 1639 &local->queue_stop_reason_lock, 1640 flags); 1641 ieee80211_purge_tx_queue(&local->hw, 1642 skbs); 1643 return true; 1644 } 1645 } else { 1646 1647 /* 1648 * Since queue is stopped, queue up frames for 1649 * later transmission from the tx-pending 1650 * tasklet when the queue is woken again. 1651 */ 1652 if (txpending) 1653 skb_queue_splice_init(skbs, 1654 &local->pending[q]); 1655 else 1656 skb_queue_splice_tail_init(skbs, 1657 &local->pending[q]); 1658 1659 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1660 flags); 1661 return false; 1662 } 1663 } 1664 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1665 1666 info->control.vif = vif; 1667 control.sta = sta ? &sta->sta : NULL; 1668 1669 __skb_unlink(skb, skbs); 1670 drv_tx(local, &control, skb); 1671 } 1672 1673 return true; 1674 } 1675 1676 /* 1677 * Returns false if the frame couldn't be transmitted but was queued instead. 1678 */ 1679 static bool __ieee80211_tx(struct ieee80211_local *local, 1680 struct sk_buff_head *skbs, int led_len, 1681 struct sta_info *sta, bool txpending) 1682 { 1683 struct ieee80211_tx_info *info; 1684 struct ieee80211_sub_if_data *sdata; 1685 struct ieee80211_vif *vif; 1686 struct sk_buff *skb; 1687 bool result = true; 1688 __le16 fc; 1689 1690 if (WARN_ON(skb_queue_empty(skbs))) 1691 return true; 1692 1693 skb = skb_peek(skbs); 1694 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1695 info = IEEE80211_SKB_CB(skb); 1696 sdata = vif_to_sdata(info->control.vif); 1697 if (sta && !sta->uploaded) 1698 sta = NULL; 1699 1700 switch (sdata->vif.type) { 1701 case NL80211_IFTYPE_MONITOR: 1702 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1703 vif = &sdata->vif; 1704 break; 1705 } 1706 sdata = rcu_dereference(local->monitor_sdata); 1707 if (sdata) { 1708 vif = &sdata->vif; 1709 info->hw_queue = 1710 vif->hw_queue[skb_get_queue_mapping(skb)]; 1711 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1712 ieee80211_purge_tx_queue(&local->hw, skbs); 1713 return true; 1714 } else 1715 vif = NULL; 1716 break; 1717 case NL80211_IFTYPE_AP_VLAN: 1718 sdata = container_of(sdata->bss, 1719 struct ieee80211_sub_if_data, u.ap); 1720 fallthrough; 1721 default: 1722 vif = &sdata->vif; 1723 break; 1724 } 1725 1726 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1727 1728 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1729 1730 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1731 1732 return result; 1733 } 1734 1735 /* 1736 * Invoke TX handlers, return 0 on success and non-zero if the 1737 * frame was dropped or queued. 1738 * 1739 * The handlers are split into an early and late part. The latter is everything 1740 * that can be sensitive to reordering, and will be deferred to after packets 1741 * are dequeued from the intermediate queues (when they are enabled). 1742 */ 1743 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1744 { 1745 ieee80211_tx_result res = TX_DROP; 1746 1747 #define CALL_TXH(txh) \ 1748 do { \ 1749 res = txh(tx); \ 1750 if (res != TX_CONTINUE) \ 1751 goto txh_done; \ 1752 } while (0) 1753 1754 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1755 CALL_TXH(ieee80211_tx_h_check_assoc); 1756 CALL_TXH(ieee80211_tx_h_ps_buf); 1757 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1758 CALL_TXH(ieee80211_tx_h_select_key); 1759 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1760 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1761 1762 txh_done: 1763 if (unlikely(res == TX_DROP)) { 1764 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1765 if (tx->skb) 1766 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1767 else 1768 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1769 return -1; 1770 } else if (unlikely(res == TX_QUEUED)) { 1771 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1772 return -1; 1773 } 1774 1775 return 0; 1776 } 1777 1778 /* 1779 * Late handlers can be called while the sta lock is held. Handlers that can 1780 * cause packets to be generated will cause deadlock! 1781 */ 1782 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1783 { 1784 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1785 ieee80211_tx_result res = TX_CONTINUE; 1786 1787 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1788 __skb_queue_tail(&tx->skbs, tx->skb); 1789 tx->skb = NULL; 1790 goto txh_done; 1791 } 1792 1793 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1794 CALL_TXH(ieee80211_tx_h_sequence); 1795 CALL_TXH(ieee80211_tx_h_fragment); 1796 /* handlers after fragment must be aware of tx info fragmentation! */ 1797 CALL_TXH(ieee80211_tx_h_stats); 1798 CALL_TXH(ieee80211_tx_h_encrypt); 1799 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1800 CALL_TXH(ieee80211_tx_h_calculate_duration); 1801 #undef CALL_TXH 1802 1803 txh_done: 1804 if (unlikely(res == TX_DROP)) { 1805 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1806 if (tx->skb) 1807 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1808 else 1809 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1810 return -1; 1811 } else if (unlikely(res == TX_QUEUED)) { 1812 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1813 return -1; 1814 } 1815 1816 return 0; 1817 } 1818 1819 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1820 { 1821 int r = invoke_tx_handlers_early(tx); 1822 1823 if (r) 1824 return r; 1825 return invoke_tx_handlers_late(tx); 1826 } 1827 1828 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1829 struct ieee80211_vif *vif, struct sk_buff *skb, 1830 int band, struct ieee80211_sta **sta) 1831 { 1832 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1833 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1834 struct ieee80211_tx_data tx; 1835 struct sk_buff *skb2; 1836 1837 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1838 return false; 1839 1840 info->band = band; 1841 info->control.vif = vif; 1842 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1843 1844 if (invoke_tx_handlers(&tx)) 1845 return false; 1846 1847 if (sta) { 1848 if (tx.sta) 1849 *sta = &tx.sta->sta; 1850 else 1851 *sta = NULL; 1852 } 1853 1854 /* this function isn't suitable for fragmented data frames */ 1855 skb2 = __skb_dequeue(&tx.skbs); 1856 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1857 ieee80211_free_txskb(hw, skb2); 1858 ieee80211_purge_tx_queue(hw, &tx.skbs); 1859 return false; 1860 } 1861 1862 return true; 1863 } 1864 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1865 1866 /* 1867 * Returns false if the frame couldn't be transmitted but was queued instead. 1868 */ 1869 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1870 struct sta_info *sta, struct sk_buff *skb, 1871 bool txpending) 1872 { 1873 struct ieee80211_local *local = sdata->local; 1874 struct ieee80211_tx_data tx; 1875 ieee80211_tx_result res_prepare; 1876 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1877 bool result = true; 1878 int led_len; 1879 1880 if (unlikely(skb->len < 10)) { 1881 dev_kfree_skb(skb); 1882 return true; 1883 } 1884 1885 /* initialises tx */ 1886 led_len = skb->len; 1887 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1888 1889 if (unlikely(res_prepare == TX_DROP)) { 1890 ieee80211_free_txskb(&local->hw, skb); 1891 return true; 1892 } else if (unlikely(res_prepare == TX_QUEUED)) { 1893 return true; 1894 } 1895 1896 /* set up hw_queue value early */ 1897 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1898 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1899 info->hw_queue = 1900 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1901 1902 if (invoke_tx_handlers_early(&tx)) 1903 return true; 1904 1905 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1906 return true; 1907 1908 if (!invoke_tx_handlers_late(&tx)) 1909 result = __ieee80211_tx(local, &tx.skbs, led_len, 1910 tx.sta, txpending); 1911 1912 return result; 1913 } 1914 1915 /* device xmit handlers */ 1916 1917 enum ieee80211_encrypt { 1918 ENCRYPT_NO, 1919 ENCRYPT_MGMT, 1920 ENCRYPT_DATA, 1921 }; 1922 1923 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1924 struct sk_buff *skb, 1925 int head_need, 1926 enum ieee80211_encrypt encrypt) 1927 { 1928 struct ieee80211_local *local = sdata->local; 1929 bool enc_tailroom; 1930 int tail_need = 0; 1931 1932 enc_tailroom = encrypt == ENCRYPT_MGMT || 1933 (encrypt == ENCRYPT_DATA && 1934 sdata->crypto_tx_tailroom_needed_cnt); 1935 1936 if (enc_tailroom) { 1937 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1938 tail_need -= skb_tailroom(skb); 1939 tail_need = max_t(int, tail_need, 0); 1940 } 1941 1942 if (skb_cloned(skb) && 1943 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1944 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1945 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1946 else if (head_need || tail_need) 1947 I802_DEBUG_INC(local->tx_expand_skb_head); 1948 else 1949 return 0; 1950 1951 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1952 wiphy_debug(local->hw.wiphy, 1953 "failed to reallocate TX buffer\n"); 1954 return -ENOMEM; 1955 } 1956 1957 return 0; 1958 } 1959 1960 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1961 struct sta_info *sta, struct sk_buff *skb) 1962 { 1963 struct ieee80211_local *local = sdata->local; 1964 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1965 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1966 int headroom; 1967 enum ieee80211_encrypt encrypt; 1968 1969 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 1970 encrypt = ENCRYPT_NO; 1971 else if (ieee80211_is_mgmt(hdr->frame_control)) 1972 encrypt = ENCRYPT_MGMT; 1973 else 1974 encrypt = ENCRYPT_DATA; 1975 1976 headroom = local->tx_headroom; 1977 if (encrypt != ENCRYPT_NO) 1978 headroom += sdata->encrypt_headroom; 1979 headroom -= skb_headroom(skb); 1980 headroom = max_t(int, 0, headroom); 1981 1982 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 1983 ieee80211_free_txskb(&local->hw, skb); 1984 return; 1985 } 1986 1987 /* reload after potential resize */ 1988 hdr = (struct ieee80211_hdr *) skb->data; 1989 info->control.vif = &sdata->vif; 1990 1991 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1992 if (ieee80211_is_data(hdr->frame_control) && 1993 is_unicast_ether_addr(hdr->addr1)) { 1994 if (mesh_nexthop_resolve(sdata, skb)) 1995 return; /* skb queued: don't free */ 1996 } else { 1997 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1998 } 1999 } 2000 2001 ieee80211_set_qos_hdr(sdata, skb); 2002 ieee80211_tx(sdata, sta, skb, false); 2003 } 2004 2005 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2006 struct net_device *dev) 2007 { 2008 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2009 struct ieee80211_radiotap_iterator iterator; 2010 struct ieee80211_radiotap_header *rthdr = 2011 (struct ieee80211_radiotap_header *) skb->data; 2012 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2013 struct ieee80211_supported_band *sband = 2014 local->hw.wiphy->bands[info->band]; 2015 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2016 NULL); 2017 u16 txflags; 2018 u16 rate = 0; 2019 bool rate_found = false; 2020 u8 rate_retries = 0; 2021 u16 rate_flags = 0; 2022 u8 mcs_known, mcs_flags, mcs_bw; 2023 u16 vht_known; 2024 u8 vht_mcs = 0, vht_nss = 0; 2025 int i; 2026 2027 /* check for not even having the fixed radiotap header part */ 2028 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2029 return false; /* too short to be possibly valid */ 2030 2031 /* is it a header version we can trust to find length from? */ 2032 if (unlikely(rthdr->it_version)) 2033 return false; /* only version 0 is supported */ 2034 2035 /* does the skb contain enough to deliver on the alleged length? */ 2036 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2037 return false; /* skb too short for claimed rt header extent */ 2038 2039 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2040 IEEE80211_TX_CTL_DONTFRAG; 2041 2042 /* 2043 * for every radiotap entry that is present 2044 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2045 * entries present, or -EINVAL on error) 2046 */ 2047 2048 while (!ret) { 2049 ret = ieee80211_radiotap_iterator_next(&iterator); 2050 2051 if (ret) 2052 continue; 2053 2054 /* see if this argument is something we can use */ 2055 switch (iterator.this_arg_index) { 2056 /* 2057 * You must take care when dereferencing iterator.this_arg 2058 * for multibyte types... the pointer is not aligned. Use 2059 * get_unaligned((type *)iterator.this_arg) to dereference 2060 * iterator.this_arg for type "type" safely on all arches. 2061 */ 2062 case IEEE80211_RADIOTAP_FLAGS: 2063 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2064 /* 2065 * this indicates that the skb we have been 2066 * handed has the 32-bit FCS CRC at the end... 2067 * we should react to that by snipping it off 2068 * because it will be recomputed and added 2069 * on transmission 2070 */ 2071 if (skb->len < (iterator._max_length + FCS_LEN)) 2072 return false; 2073 2074 skb_trim(skb, skb->len - FCS_LEN); 2075 } 2076 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2077 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2078 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2079 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2080 break; 2081 2082 case IEEE80211_RADIOTAP_TX_FLAGS: 2083 txflags = get_unaligned_le16(iterator.this_arg); 2084 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2085 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2086 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2087 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2088 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2089 info->control.flags |= 2090 IEEE80211_TX_CTRL_DONT_REORDER; 2091 break; 2092 2093 case IEEE80211_RADIOTAP_RATE: 2094 rate = *iterator.this_arg; 2095 rate_flags = 0; 2096 rate_found = true; 2097 break; 2098 2099 case IEEE80211_RADIOTAP_DATA_RETRIES: 2100 rate_retries = *iterator.this_arg; 2101 break; 2102 2103 case IEEE80211_RADIOTAP_MCS: 2104 mcs_known = iterator.this_arg[0]; 2105 mcs_flags = iterator.this_arg[1]; 2106 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2107 break; 2108 2109 rate_found = true; 2110 rate = iterator.this_arg[2]; 2111 rate_flags = IEEE80211_TX_RC_MCS; 2112 2113 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2114 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2115 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2116 2117 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2118 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2119 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2120 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2121 2122 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2123 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2124 info->flags |= IEEE80211_TX_CTL_LDPC; 2125 2126 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2127 u8 stbc = u8_get_bits(mcs_flags, 2128 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2129 2130 info->flags |= 2131 u32_encode_bits(stbc, 2132 IEEE80211_TX_CTL_STBC); 2133 } 2134 break; 2135 2136 case IEEE80211_RADIOTAP_VHT: 2137 vht_known = get_unaligned_le16(iterator.this_arg); 2138 rate_found = true; 2139 2140 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2141 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2142 (iterator.this_arg[2] & 2143 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2144 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2145 if (vht_known & 2146 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2147 if (iterator.this_arg[3] == 1) 2148 rate_flags |= 2149 IEEE80211_TX_RC_40_MHZ_WIDTH; 2150 else if (iterator.this_arg[3] == 4) 2151 rate_flags |= 2152 IEEE80211_TX_RC_80_MHZ_WIDTH; 2153 else if (iterator.this_arg[3] == 11) 2154 rate_flags |= 2155 IEEE80211_TX_RC_160_MHZ_WIDTH; 2156 } 2157 2158 vht_mcs = iterator.this_arg[4] >> 4; 2159 vht_nss = iterator.this_arg[4] & 0xF; 2160 break; 2161 2162 /* 2163 * Please update the file 2164 * Documentation/networking/mac80211-injection.rst 2165 * when parsing new fields here. 2166 */ 2167 2168 default: 2169 break; 2170 } 2171 } 2172 2173 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2174 return false; 2175 2176 if (rate_found) { 2177 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2178 2179 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2180 info->control.rates[i].idx = -1; 2181 info->control.rates[i].flags = 0; 2182 info->control.rates[i].count = 0; 2183 } 2184 2185 if (rate_flags & IEEE80211_TX_RC_MCS) { 2186 info->control.rates[0].idx = rate; 2187 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2188 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2189 vht_nss); 2190 } else { 2191 for (i = 0; i < sband->n_bitrates; i++) { 2192 if (rate * 5 != sband->bitrates[i].bitrate) 2193 continue; 2194 2195 info->control.rates[0].idx = i; 2196 break; 2197 } 2198 } 2199 2200 if (info->control.rates[0].idx < 0) 2201 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2202 2203 info->control.rates[0].flags = rate_flags; 2204 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2205 local->hw.max_rate_tries); 2206 } 2207 2208 return true; 2209 } 2210 2211 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2212 struct net_device *dev) 2213 { 2214 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2215 struct ieee80211_chanctx_conf *chanctx_conf; 2216 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2217 struct ieee80211_hdr *hdr; 2218 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2219 struct cfg80211_chan_def *chandef; 2220 u16 len_rthdr; 2221 int hdrlen; 2222 2223 memset(info, 0, sizeof(*info)); 2224 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2225 IEEE80211_TX_CTL_INJECTED; 2226 2227 /* Sanity-check and process the injection radiotap header */ 2228 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2229 goto fail; 2230 2231 /* we now know there is a radiotap header with a length we can use */ 2232 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2233 2234 /* 2235 * fix up the pointers accounting for the radiotap 2236 * header still being in there. We are being given 2237 * a precooked IEEE80211 header so no need for 2238 * normal processing 2239 */ 2240 skb_set_mac_header(skb, len_rthdr); 2241 /* 2242 * these are just fixed to the end of the rt area since we 2243 * don't have any better information and at this point, nobody cares 2244 */ 2245 skb_set_network_header(skb, len_rthdr); 2246 skb_set_transport_header(skb, len_rthdr); 2247 2248 if (skb->len < len_rthdr + 2) 2249 goto fail; 2250 2251 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2252 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2253 2254 if (skb->len < len_rthdr + hdrlen) 2255 goto fail; 2256 2257 /* 2258 * Initialize skb->protocol if the injected frame is a data frame 2259 * carrying a rfc1042 header 2260 */ 2261 if (ieee80211_is_data(hdr->frame_control) && 2262 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2263 u8 *payload = (u8 *)hdr + hdrlen; 2264 2265 if (ether_addr_equal(payload, rfc1042_header)) 2266 skb->protocol = cpu_to_be16((payload[6] << 8) | 2267 payload[7]); 2268 } 2269 2270 /* Initialize skb->priority for QoS frames. If the DONT_REORDER flag 2271 * is set, stick to the default value for skb->priority to assure 2272 * frames injected with this flag are not reordered relative to each 2273 * other. 2274 */ 2275 if (ieee80211_is_data_qos(hdr->frame_control) && 2276 !(info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER)) { 2277 u8 *p = ieee80211_get_qos_ctl(hdr); 2278 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 2279 } 2280 2281 rcu_read_lock(); 2282 2283 /* 2284 * We process outgoing injected frames that have a local address 2285 * we handle as though they are non-injected frames. 2286 * This code here isn't entirely correct, the local MAC address 2287 * isn't always enough to find the interface to use; for proper 2288 * VLAN support we have an nl80211-based mechanism. 2289 * 2290 * This is necessary, for example, for old hostapd versions that 2291 * don't use nl80211-based management TX/RX. 2292 */ 2293 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2294 2295 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2296 if (!ieee80211_sdata_running(tmp_sdata)) 2297 continue; 2298 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2299 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2300 continue; 2301 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2302 sdata = tmp_sdata; 2303 break; 2304 } 2305 } 2306 2307 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2308 if (!chanctx_conf) { 2309 tmp_sdata = rcu_dereference(local->monitor_sdata); 2310 if (tmp_sdata) 2311 chanctx_conf = 2312 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2313 } 2314 2315 if (chanctx_conf) 2316 chandef = &chanctx_conf->def; 2317 else if (!local->use_chanctx) 2318 chandef = &local->_oper_chandef; 2319 else 2320 goto fail_rcu; 2321 2322 /* 2323 * Frame injection is not allowed if beaconing is not allowed 2324 * or if we need radar detection. Beaconing is usually not allowed when 2325 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2326 * Passive scan is also used in world regulatory domains where 2327 * your country is not known and as such it should be treated as 2328 * NO TX unless the channel is explicitly allowed in which case 2329 * your current regulatory domain would not have the passive scan 2330 * flag. 2331 * 2332 * Since AP mode uses monitor interfaces to inject/TX management 2333 * frames we can make AP mode the exception to this rule once it 2334 * supports radar detection as its implementation can deal with 2335 * radar detection by itself. We can do that later by adding a 2336 * monitor flag interfaces used for AP support. 2337 */ 2338 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2339 sdata->vif.type)) 2340 goto fail_rcu; 2341 2342 info->band = chandef->chan->band; 2343 2344 /* remove the injection radiotap header */ 2345 skb_pull(skb, len_rthdr); 2346 2347 ieee80211_xmit(sdata, NULL, skb); 2348 rcu_read_unlock(); 2349 2350 return NETDEV_TX_OK; 2351 2352 fail_rcu: 2353 rcu_read_unlock(); 2354 fail: 2355 dev_kfree_skb(skb); 2356 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2357 } 2358 2359 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2360 { 2361 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2362 2363 return ethertype == ETH_P_TDLS && 2364 skb->len > 14 && 2365 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2366 } 2367 2368 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2369 struct sk_buff *skb, 2370 struct sta_info **sta_out) 2371 { 2372 struct sta_info *sta; 2373 2374 switch (sdata->vif.type) { 2375 case NL80211_IFTYPE_AP_VLAN: 2376 sta = rcu_dereference(sdata->u.vlan.sta); 2377 if (sta) { 2378 *sta_out = sta; 2379 return 0; 2380 } else if (sdata->wdev.use_4addr) { 2381 return -ENOLINK; 2382 } 2383 fallthrough; 2384 case NL80211_IFTYPE_AP: 2385 case NL80211_IFTYPE_OCB: 2386 case NL80211_IFTYPE_ADHOC: 2387 if (is_multicast_ether_addr(skb->data)) { 2388 *sta_out = ERR_PTR(-ENOENT); 2389 return 0; 2390 } 2391 sta = sta_info_get_bss(sdata, skb->data); 2392 break; 2393 #ifdef CONFIG_MAC80211_MESH 2394 case NL80211_IFTYPE_MESH_POINT: 2395 /* determined much later */ 2396 *sta_out = NULL; 2397 return 0; 2398 #endif 2399 case NL80211_IFTYPE_STATION: 2400 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2401 sta = sta_info_get(sdata, skb->data); 2402 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2403 if (test_sta_flag(sta, 2404 WLAN_STA_TDLS_PEER_AUTH)) { 2405 *sta_out = sta; 2406 return 0; 2407 } 2408 2409 /* 2410 * TDLS link during setup - throw out frames to 2411 * peer. Allow TDLS-setup frames to unauthorized 2412 * peers for the special case of a link teardown 2413 * after a TDLS sta is removed due to being 2414 * unreachable. 2415 */ 2416 if (!ieee80211_is_tdls_setup(skb)) 2417 return -EINVAL; 2418 } 2419 2420 } 2421 2422 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2423 if (!sta) 2424 return -ENOLINK; 2425 break; 2426 default: 2427 return -EINVAL; 2428 } 2429 2430 *sta_out = sta ?: ERR_PTR(-ENOENT); 2431 return 0; 2432 } 2433 2434 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2435 struct sk_buff *skb, 2436 u32 *info_flags, 2437 u64 *cookie) 2438 { 2439 struct sk_buff *ack_skb; 2440 u16 info_id = 0; 2441 2442 if (skb->sk) 2443 ack_skb = skb_clone_sk(skb); 2444 else 2445 ack_skb = skb_clone(skb, GFP_ATOMIC); 2446 2447 if (ack_skb) { 2448 unsigned long flags; 2449 int id; 2450 2451 spin_lock_irqsave(&local->ack_status_lock, flags); 2452 id = idr_alloc(&local->ack_status_frames, ack_skb, 2453 1, 0x2000, GFP_ATOMIC); 2454 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2455 2456 if (id >= 0) { 2457 info_id = id; 2458 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2459 if (cookie) { 2460 *cookie = ieee80211_mgmt_tx_cookie(local); 2461 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2462 } 2463 } else { 2464 kfree_skb(ack_skb); 2465 } 2466 } 2467 2468 return info_id; 2469 } 2470 2471 /** 2472 * ieee80211_build_hdr - build 802.11 header in the given frame 2473 * @sdata: virtual interface to build the header for 2474 * @skb: the skb to build the header in 2475 * @info_flags: skb flags to set 2476 * @sta: the station pointer 2477 * @ctrl_flags: info control flags to set 2478 * @cookie: cookie pointer to fill (if not %NULL) 2479 * 2480 * This function takes the skb with 802.3 header and reformats the header to 2481 * the appropriate IEEE 802.11 header based on which interface the packet is 2482 * being transmitted on. 2483 * 2484 * Note that this function also takes care of the TX status request and 2485 * potential unsharing of the SKB - this needs to be interleaved with the 2486 * header building. 2487 * 2488 * The function requires the read-side RCU lock held 2489 * 2490 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2491 */ 2492 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2493 struct sk_buff *skb, u32 info_flags, 2494 struct sta_info *sta, u32 ctrl_flags, 2495 u64 *cookie) 2496 { 2497 struct ieee80211_local *local = sdata->local; 2498 struct ieee80211_tx_info *info; 2499 int head_need; 2500 u16 ethertype, hdrlen, meshhdrlen = 0; 2501 __le16 fc; 2502 struct ieee80211_hdr hdr; 2503 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2504 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2505 const u8 *encaps_data; 2506 int encaps_len, skip_header_bytes; 2507 bool wme_sta = false, authorized = false; 2508 bool tdls_peer; 2509 bool multicast; 2510 u16 info_id = 0; 2511 struct ieee80211_chanctx_conf *chanctx_conf; 2512 struct ieee80211_sub_if_data *ap_sdata; 2513 enum nl80211_band band; 2514 int ret; 2515 2516 if (IS_ERR(sta)) 2517 sta = NULL; 2518 2519 #ifdef CONFIG_MAC80211_DEBUGFS 2520 if (local->force_tx_status) 2521 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2522 #endif 2523 2524 /* convert Ethernet header to proper 802.11 header (based on 2525 * operation mode) */ 2526 ethertype = (skb->data[12] << 8) | skb->data[13]; 2527 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2528 2529 switch (sdata->vif.type) { 2530 case NL80211_IFTYPE_AP_VLAN: 2531 if (sdata->wdev.use_4addr) { 2532 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2533 /* RA TA DA SA */ 2534 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2535 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2536 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2537 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2538 hdrlen = 30; 2539 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2540 wme_sta = sta->sta.wme; 2541 } 2542 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2543 u.ap); 2544 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2545 if (!chanctx_conf) { 2546 ret = -ENOTCONN; 2547 goto free; 2548 } 2549 band = chanctx_conf->def.chan->band; 2550 if (sdata->wdev.use_4addr) 2551 break; 2552 fallthrough; 2553 case NL80211_IFTYPE_AP: 2554 if (sdata->vif.type == NL80211_IFTYPE_AP) 2555 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2556 if (!chanctx_conf) { 2557 ret = -ENOTCONN; 2558 goto free; 2559 } 2560 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2561 /* DA BSSID SA */ 2562 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2563 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2564 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2565 hdrlen = 24; 2566 band = chanctx_conf->def.chan->band; 2567 break; 2568 #ifdef CONFIG_MAC80211_MESH 2569 case NL80211_IFTYPE_MESH_POINT: 2570 if (!is_multicast_ether_addr(skb->data)) { 2571 struct sta_info *next_hop; 2572 bool mpp_lookup = true; 2573 2574 mpath = mesh_path_lookup(sdata, skb->data); 2575 if (mpath) { 2576 mpp_lookup = false; 2577 next_hop = rcu_dereference(mpath->next_hop); 2578 if (!next_hop || 2579 !(mpath->flags & (MESH_PATH_ACTIVE | 2580 MESH_PATH_RESOLVING))) 2581 mpp_lookup = true; 2582 } 2583 2584 if (mpp_lookup) { 2585 mppath = mpp_path_lookup(sdata, skb->data); 2586 if (mppath) 2587 mppath->exp_time = jiffies; 2588 } 2589 2590 if (mppath && mpath) 2591 mesh_path_del(sdata, mpath->dst); 2592 } 2593 2594 /* 2595 * Use address extension if it is a packet from 2596 * another interface or if we know the destination 2597 * is being proxied by a portal (i.e. portal address 2598 * differs from proxied address) 2599 */ 2600 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2601 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2602 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2603 skb->data, skb->data + ETH_ALEN); 2604 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2605 NULL, NULL); 2606 } else { 2607 /* DS -> MBSS (802.11-2012 13.11.3.3). 2608 * For unicast with unknown forwarding information, 2609 * destination might be in the MBSS or if that fails 2610 * forwarded to another mesh gate. In either case 2611 * resolution will be handled in ieee80211_xmit(), so 2612 * leave the original DA. This also works for mcast */ 2613 const u8 *mesh_da = skb->data; 2614 2615 if (mppath) 2616 mesh_da = mppath->mpp; 2617 else if (mpath) 2618 mesh_da = mpath->dst; 2619 2620 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2621 mesh_da, sdata->vif.addr); 2622 if (is_multicast_ether_addr(mesh_da)) 2623 /* DA TA mSA AE:SA */ 2624 meshhdrlen = ieee80211_new_mesh_header( 2625 sdata, &mesh_hdr, 2626 skb->data + ETH_ALEN, NULL); 2627 else 2628 /* RA TA mDA mSA AE:DA SA */ 2629 meshhdrlen = ieee80211_new_mesh_header( 2630 sdata, &mesh_hdr, skb->data, 2631 skb->data + ETH_ALEN); 2632 2633 } 2634 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2635 if (!chanctx_conf) { 2636 ret = -ENOTCONN; 2637 goto free; 2638 } 2639 band = chanctx_conf->def.chan->band; 2640 2641 /* For injected frames, fill RA right away as nexthop lookup 2642 * will be skipped. 2643 */ 2644 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2645 is_zero_ether_addr(hdr.addr1)) 2646 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2647 break; 2648 #endif 2649 case NL80211_IFTYPE_STATION: 2650 /* we already did checks when looking up the RA STA */ 2651 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2652 2653 if (tdls_peer) { 2654 /* DA SA BSSID */ 2655 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2656 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2657 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2658 hdrlen = 24; 2659 } else if (sdata->u.mgd.use_4addr && 2660 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2661 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2662 IEEE80211_FCTL_TODS); 2663 /* RA TA DA SA */ 2664 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2665 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2666 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2667 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2668 hdrlen = 30; 2669 } else { 2670 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2671 /* BSSID SA DA */ 2672 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2673 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2674 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2675 hdrlen = 24; 2676 } 2677 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2678 if (!chanctx_conf) { 2679 ret = -ENOTCONN; 2680 goto free; 2681 } 2682 band = chanctx_conf->def.chan->band; 2683 break; 2684 case NL80211_IFTYPE_OCB: 2685 /* DA SA BSSID */ 2686 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2687 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2688 eth_broadcast_addr(hdr.addr3); 2689 hdrlen = 24; 2690 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2691 if (!chanctx_conf) { 2692 ret = -ENOTCONN; 2693 goto free; 2694 } 2695 band = chanctx_conf->def.chan->band; 2696 break; 2697 case NL80211_IFTYPE_ADHOC: 2698 /* DA SA BSSID */ 2699 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2700 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2701 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2702 hdrlen = 24; 2703 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2704 if (!chanctx_conf) { 2705 ret = -ENOTCONN; 2706 goto free; 2707 } 2708 band = chanctx_conf->def.chan->band; 2709 break; 2710 default: 2711 ret = -EINVAL; 2712 goto free; 2713 } 2714 2715 multicast = is_multicast_ether_addr(hdr.addr1); 2716 2717 /* sta is always NULL for mesh */ 2718 if (sta) { 2719 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2720 wme_sta = sta->sta.wme; 2721 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2722 /* For mesh, the use of the QoS header is mandatory */ 2723 wme_sta = true; 2724 } 2725 2726 /* receiver does QoS (which also means we do) use it */ 2727 if (wme_sta) { 2728 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2729 hdrlen += 2; 2730 } 2731 2732 /* 2733 * Drop unicast frames to unauthorised stations unless they are 2734 * EAPOL frames from the local station. 2735 */ 2736 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2737 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2738 !multicast && !authorized && 2739 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2740 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2741 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2742 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2743 sdata->name, hdr.addr1); 2744 #endif 2745 2746 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2747 2748 ret = -EPERM; 2749 goto free; 2750 } 2751 2752 if (unlikely(!multicast && ((skb->sk && 2753 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2754 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2755 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2756 cookie); 2757 2758 /* 2759 * If the skb is shared we need to obtain our own copy. 2760 */ 2761 if (skb_shared(skb)) { 2762 struct sk_buff *tmp_skb = skb; 2763 2764 /* can't happen -- skb is a clone if info_id != 0 */ 2765 WARN_ON(info_id); 2766 2767 skb = skb_clone(skb, GFP_ATOMIC); 2768 kfree_skb(tmp_skb); 2769 2770 if (!skb) { 2771 ret = -ENOMEM; 2772 goto free; 2773 } 2774 } 2775 2776 hdr.frame_control = fc; 2777 hdr.duration_id = 0; 2778 hdr.seq_ctrl = 0; 2779 2780 skip_header_bytes = ETH_HLEN; 2781 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2782 encaps_data = bridge_tunnel_header; 2783 encaps_len = sizeof(bridge_tunnel_header); 2784 skip_header_bytes -= 2; 2785 } else if (ethertype >= ETH_P_802_3_MIN) { 2786 encaps_data = rfc1042_header; 2787 encaps_len = sizeof(rfc1042_header); 2788 skip_header_bytes -= 2; 2789 } else { 2790 encaps_data = NULL; 2791 encaps_len = 0; 2792 } 2793 2794 skb_pull(skb, skip_header_bytes); 2795 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2796 2797 /* 2798 * So we need to modify the skb header and hence need a copy of 2799 * that. The head_need variable above doesn't, so far, include 2800 * the needed header space that we don't need right away. If we 2801 * can, then we don't reallocate right now but only after the 2802 * frame arrives at the master device (if it does...) 2803 * 2804 * If we cannot, however, then we will reallocate to include all 2805 * the ever needed space. Also, if we need to reallocate it anyway, 2806 * make it big enough for everything we may ever need. 2807 */ 2808 2809 if (head_need > 0 || skb_cloned(skb)) { 2810 head_need += sdata->encrypt_headroom; 2811 head_need += local->tx_headroom; 2812 head_need = max_t(int, 0, head_need); 2813 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2814 ieee80211_free_txskb(&local->hw, skb); 2815 skb = NULL; 2816 return ERR_PTR(-ENOMEM); 2817 } 2818 } 2819 2820 if (encaps_data) 2821 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2822 2823 #ifdef CONFIG_MAC80211_MESH 2824 if (meshhdrlen > 0) 2825 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2826 #endif 2827 2828 if (ieee80211_is_data_qos(fc)) { 2829 __le16 *qos_control; 2830 2831 qos_control = skb_push(skb, 2); 2832 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2833 /* 2834 * Maybe we could actually set some fields here, for now just 2835 * initialise to zero to indicate no special operation. 2836 */ 2837 *qos_control = 0; 2838 } else 2839 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2840 2841 skb_reset_mac_header(skb); 2842 2843 info = IEEE80211_SKB_CB(skb); 2844 memset(info, 0, sizeof(*info)); 2845 2846 info->flags = info_flags; 2847 info->ack_frame_id = info_id; 2848 info->band = band; 2849 info->control.flags = ctrl_flags; 2850 2851 return skb; 2852 free: 2853 kfree_skb(skb); 2854 return ERR_PTR(ret); 2855 } 2856 2857 /* 2858 * fast-xmit overview 2859 * 2860 * The core idea of this fast-xmit is to remove per-packet checks by checking 2861 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2862 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2863 * much less work can be done per packet. For example, fragmentation must be 2864 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2865 * in the code here. 2866 * 2867 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2868 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2869 * 2870 * The most difficult part of this is that when any of these assumptions 2871 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2872 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2873 * since the per-packet code no longer checks the conditions. This is reflected 2874 * by the calls to these functions throughout the rest of the code, and must be 2875 * maintained if any of the TX path checks change. 2876 */ 2877 2878 void ieee80211_check_fast_xmit(struct sta_info *sta) 2879 { 2880 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2881 struct ieee80211_local *local = sta->local; 2882 struct ieee80211_sub_if_data *sdata = sta->sdata; 2883 struct ieee80211_hdr *hdr = (void *)build.hdr; 2884 struct ieee80211_chanctx_conf *chanctx_conf; 2885 __le16 fc; 2886 2887 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2888 return; 2889 2890 /* Locking here protects both the pointer itself, and against concurrent 2891 * invocations winning data access races to, e.g., the key pointer that 2892 * is used. 2893 * Without it, the invocation of this function right after the key 2894 * pointer changes wouldn't be sufficient, as another CPU could access 2895 * the pointer, then stall, and then do the cache update after the CPU 2896 * that invalidated the key. 2897 * With the locking, such scenarios cannot happen as the check for the 2898 * key and the fast-tx assignment are done atomically, so the CPU that 2899 * modifies the key will either wait or other one will see the key 2900 * cleared/changed already. 2901 */ 2902 spin_lock_bh(&sta->lock); 2903 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2904 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2905 sdata->vif.type == NL80211_IFTYPE_STATION) 2906 goto out; 2907 2908 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2909 goto out; 2910 2911 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2912 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2913 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2914 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2915 goto out; 2916 2917 if (sdata->noack_map) 2918 goto out; 2919 2920 /* fast-xmit doesn't handle fragmentation at all */ 2921 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2922 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2923 goto out; 2924 2925 rcu_read_lock(); 2926 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2927 if (!chanctx_conf) { 2928 rcu_read_unlock(); 2929 goto out; 2930 } 2931 build.band = chanctx_conf->def.chan->band; 2932 rcu_read_unlock(); 2933 2934 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2935 2936 switch (sdata->vif.type) { 2937 case NL80211_IFTYPE_ADHOC: 2938 /* DA SA BSSID */ 2939 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2940 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2941 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2942 build.hdr_len = 24; 2943 break; 2944 case NL80211_IFTYPE_STATION: 2945 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2946 /* DA SA BSSID */ 2947 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2948 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2949 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2950 build.hdr_len = 24; 2951 break; 2952 } 2953 2954 if (sdata->u.mgd.use_4addr) { 2955 /* non-regular ethertype cannot use the fastpath */ 2956 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2957 IEEE80211_FCTL_TODS); 2958 /* RA TA DA SA */ 2959 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2960 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2961 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2962 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2963 build.hdr_len = 30; 2964 break; 2965 } 2966 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2967 /* BSSID SA DA */ 2968 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2969 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2970 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2971 build.hdr_len = 24; 2972 break; 2973 case NL80211_IFTYPE_AP_VLAN: 2974 if (sdata->wdev.use_4addr) { 2975 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2976 IEEE80211_FCTL_TODS); 2977 /* RA TA DA SA */ 2978 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2979 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2980 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2981 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2982 build.hdr_len = 30; 2983 break; 2984 } 2985 fallthrough; 2986 case NL80211_IFTYPE_AP: 2987 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2988 /* DA BSSID SA */ 2989 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2990 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2991 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2992 build.hdr_len = 24; 2993 break; 2994 default: 2995 /* not handled on fast-xmit */ 2996 goto out; 2997 } 2998 2999 if (sta->sta.wme) { 3000 build.hdr_len += 2; 3001 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3002 } 3003 3004 /* We store the key here so there's no point in using rcu_dereference() 3005 * but that's fine because the code that changes the pointers will call 3006 * this function after doing so. For a single CPU that would be enough, 3007 * for multiple see the comment above. 3008 */ 3009 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3010 if (!build.key) 3011 build.key = rcu_access_pointer(sdata->default_unicast_key); 3012 if (build.key) { 3013 bool gen_iv, iv_spc, mmic; 3014 3015 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3016 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3017 mmic = build.key->conf.flags & 3018 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3019 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3020 3021 /* don't handle software crypto */ 3022 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3023 goto out; 3024 3025 /* Key is being removed */ 3026 if (build.key->flags & KEY_FLAG_TAINTED) 3027 goto out; 3028 3029 switch (build.key->conf.cipher) { 3030 case WLAN_CIPHER_SUITE_CCMP: 3031 case WLAN_CIPHER_SUITE_CCMP_256: 3032 if (gen_iv) 3033 build.pn_offs = build.hdr_len; 3034 if (gen_iv || iv_spc) 3035 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3036 break; 3037 case WLAN_CIPHER_SUITE_GCMP: 3038 case WLAN_CIPHER_SUITE_GCMP_256: 3039 if (gen_iv) 3040 build.pn_offs = build.hdr_len; 3041 if (gen_iv || iv_spc) 3042 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3043 break; 3044 case WLAN_CIPHER_SUITE_TKIP: 3045 /* cannot handle MMIC or IV generation in xmit-fast */ 3046 if (mmic || gen_iv) 3047 goto out; 3048 if (iv_spc) 3049 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3050 break; 3051 case WLAN_CIPHER_SUITE_WEP40: 3052 case WLAN_CIPHER_SUITE_WEP104: 3053 /* cannot handle IV generation in fast-xmit */ 3054 if (gen_iv) 3055 goto out; 3056 if (iv_spc) 3057 build.hdr_len += IEEE80211_WEP_IV_LEN; 3058 break; 3059 case WLAN_CIPHER_SUITE_AES_CMAC: 3060 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3061 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3062 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3063 WARN(1, 3064 "management cipher suite 0x%x enabled for data\n", 3065 build.key->conf.cipher); 3066 goto out; 3067 default: 3068 /* we don't know how to generate IVs for this at all */ 3069 if (WARN_ON(gen_iv)) 3070 goto out; 3071 /* pure hardware keys are OK, of course */ 3072 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3073 break; 3074 /* cipher scheme might require space allocation */ 3075 if (iv_spc && 3076 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3077 goto out; 3078 if (iv_spc) 3079 build.hdr_len += build.key->conf.iv_len; 3080 } 3081 3082 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3083 } 3084 3085 hdr->frame_control = fc; 3086 3087 memcpy(build.hdr + build.hdr_len, 3088 rfc1042_header, sizeof(rfc1042_header)); 3089 build.hdr_len += sizeof(rfc1042_header); 3090 3091 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3092 /* if the kmemdup fails, continue w/o fast_tx */ 3093 if (!fast_tx) 3094 goto out; 3095 3096 out: 3097 /* we might have raced against another call to this function */ 3098 old = rcu_dereference_protected(sta->fast_tx, 3099 lockdep_is_held(&sta->lock)); 3100 rcu_assign_pointer(sta->fast_tx, fast_tx); 3101 if (old) 3102 kfree_rcu(old, rcu_head); 3103 spin_unlock_bh(&sta->lock); 3104 } 3105 3106 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3107 { 3108 struct sta_info *sta; 3109 3110 rcu_read_lock(); 3111 list_for_each_entry_rcu(sta, &local->sta_list, list) 3112 ieee80211_check_fast_xmit(sta); 3113 rcu_read_unlock(); 3114 } 3115 3116 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3117 { 3118 struct ieee80211_local *local = sdata->local; 3119 struct sta_info *sta; 3120 3121 rcu_read_lock(); 3122 3123 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3124 if (sdata != sta->sdata && 3125 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3126 continue; 3127 ieee80211_check_fast_xmit(sta); 3128 } 3129 3130 rcu_read_unlock(); 3131 } 3132 3133 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3134 { 3135 struct ieee80211_fast_tx *fast_tx; 3136 3137 spin_lock_bh(&sta->lock); 3138 fast_tx = rcu_dereference_protected(sta->fast_tx, 3139 lockdep_is_held(&sta->lock)); 3140 RCU_INIT_POINTER(sta->fast_tx, NULL); 3141 spin_unlock_bh(&sta->lock); 3142 3143 if (fast_tx) 3144 kfree_rcu(fast_tx, rcu_head); 3145 } 3146 3147 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3148 struct sk_buff *skb, int headroom) 3149 { 3150 if (skb_headroom(skb) < headroom) { 3151 I802_DEBUG_INC(local->tx_expand_skb_head); 3152 3153 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3154 wiphy_debug(local->hw.wiphy, 3155 "failed to reallocate TX buffer\n"); 3156 return false; 3157 } 3158 } 3159 3160 return true; 3161 } 3162 3163 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3164 struct ieee80211_fast_tx *fast_tx, 3165 struct sk_buff *skb) 3166 { 3167 struct ieee80211_local *local = sdata->local; 3168 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3169 struct ieee80211_hdr *hdr; 3170 struct ethhdr *amsdu_hdr; 3171 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3172 int subframe_len = skb->len - hdr_len; 3173 void *data; 3174 u8 *qc, *h_80211_src, *h_80211_dst; 3175 const u8 *bssid; 3176 3177 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3178 return false; 3179 3180 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3181 return true; 3182 3183 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3184 return false; 3185 3186 data = skb_push(skb, sizeof(*amsdu_hdr)); 3187 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3188 hdr = data; 3189 amsdu_hdr = data + hdr_len; 3190 /* h_80211_src/dst is addr* field within hdr */ 3191 h_80211_src = data + fast_tx->sa_offs; 3192 h_80211_dst = data + fast_tx->da_offs; 3193 3194 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3195 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3196 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3197 3198 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3199 * fields needs to be changed to BSSID for A-MSDU frames depending 3200 * on FromDS/ToDS values. 3201 */ 3202 switch (sdata->vif.type) { 3203 case NL80211_IFTYPE_STATION: 3204 bssid = sdata->u.mgd.bssid; 3205 break; 3206 case NL80211_IFTYPE_AP: 3207 case NL80211_IFTYPE_AP_VLAN: 3208 bssid = sdata->vif.addr; 3209 break; 3210 default: 3211 bssid = NULL; 3212 } 3213 3214 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3215 ether_addr_copy(h_80211_src, bssid); 3216 3217 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3218 ether_addr_copy(h_80211_dst, bssid); 3219 3220 qc = ieee80211_get_qos_ctl(hdr); 3221 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3222 3223 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3224 3225 return true; 3226 } 3227 3228 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3229 struct sta_info *sta, 3230 struct ieee80211_fast_tx *fast_tx, 3231 struct sk_buff *skb) 3232 { 3233 struct ieee80211_local *local = sdata->local; 3234 struct fq *fq = &local->fq; 3235 struct fq_tin *tin; 3236 struct fq_flow *flow; 3237 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3238 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3239 struct txq_info *txqi; 3240 struct sk_buff **frag_tail, *head; 3241 int subframe_len = skb->len - ETH_ALEN; 3242 u8 max_subframes = sta->sta.max_amsdu_subframes; 3243 int max_frags = local->hw.max_tx_fragments; 3244 int max_amsdu_len = sta->sta.max_amsdu_len; 3245 int orig_truesize; 3246 u32 flow_idx; 3247 __be16 len; 3248 void *data; 3249 bool ret = false; 3250 unsigned int orig_len; 3251 int n = 2, nfrags, pad = 0; 3252 u16 hdrlen; 3253 3254 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3255 return false; 3256 3257 if (skb_is_gso(skb)) 3258 return false; 3259 3260 if (!txq) 3261 return false; 3262 3263 txqi = to_txq_info(txq); 3264 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3265 return false; 3266 3267 if (sta->sta.max_rc_amsdu_len) 3268 max_amsdu_len = min_t(int, max_amsdu_len, 3269 sta->sta.max_rc_amsdu_len); 3270 3271 if (sta->sta.max_tid_amsdu_len[tid]) 3272 max_amsdu_len = min_t(int, max_amsdu_len, 3273 sta->sta.max_tid_amsdu_len[tid]); 3274 3275 flow_idx = fq_flow_idx(fq, skb); 3276 3277 spin_lock_bh(&fq->lock); 3278 3279 /* TODO: Ideally aggregation should be done on dequeue to remain 3280 * responsive to environment changes. 3281 */ 3282 3283 tin = &txqi->tin; 3284 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3285 head = skb_peek_tail(&flow->queue); 3286 if (!head || skb_is_gso(head)) 3287 goto out; 3288 3289 orig_truesize = head->truesize; 3290 orig_len = head->len; 3291 3292 if (skb->len + head->len > max_amsdu_len) 3293 goto out; 3294 3295 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3296 nfrags += 1 + skb_shinfo(head)->nr_frags; 3297 frag_tail = &skb_shinfo(head)->frag_list; 3298 while (*frag_tail) { 3299 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3300 frag_tail = &(*frag_tail)->next; 3301 n++; 3302 } 3303 3304 if (max_subframes && n > max_subframes) 3305 goto out; 3306 3307 if (max_frags && nfrags > max_frags) 3308 goto out; 3309 3310 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3311 goto out; 3312 3313 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3314 goto out; 3315 3316 /* 3317 * Pad out the previous subframe to a multiple of 4 by adding the 3318 * padding to the next one, that's being added. Note that head->len 3319 * is the length of the full A-MSDU, but that works since each time 3320 * we add a new subframe we pad out the previous one to a multiple 3321 * of 4 and thus it no longer matters in the next round. 3322 */ 3323 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3324 if ((head->len - hdrlen) & 3) 3325 pad = 4 - ((head->len - hdrlen) & 3); 3326 3327 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3328 2 + pad)) 3329 goto out_recalc; 3330 3331 ret = true; 3332 data = skb_push(skb, ETH_ALEN + 2); 3333 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3334 3335 data += 2 * ETH_ALEN; 3336 len = cpu_to_be16(subframe_len); 3337 memcpy(data, &len, 2); 3338 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3339 3340 memset(skb_push(skb, pad), 0, pad); 3341 3342 head->len += skb->len; 3343 head->data_len += skb->len; 3344 *frag_tail = skb; 3345 3346 out_recalc: 3347 fq->memory_usage += head->truesize - orig_truesize; 3348 if (head->len != orig_len) { 3349 flow->backlog += head->len - orig_len; 3350 tin->backlog_bytes += head->len - orig_len; 3351 } 3352 out: 3353 spin_unlock_bh(&fq->lock); 3354 3355 return ret; 3356 } 3357 3358 /* 3359 * Can be called while the sta lock is held. Anything that can cause packets to 3360 * be generated will cause deadlock! 3361 */ 3362 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3363 struct sta_info *sta, u8 pn_offs, 3364 struct ieee80211_key *key, 3365 struct sk_buff *skb) 3366 { 3367 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3368 struct ieee80211_hdr *hdr = (void *)skb->data; 3369 u8 tid = IEEE80211_NUM_TIDS; 3370 3371 if (key) 3372 info->control.hw_key = &key->conf; 3373 3374 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3375 3376 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3377 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3378 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3379 } else { 3380 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3381 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3382 sdata->sequence_number += 0x10; 3383 } 3384 3385 if (skb_shinfo(skb)->gso_size) 3386 sta->tx_stats.msdu[tid] += 3387 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3388 else 3389 sta->tx_stats.msdu[tid]++; 3390 3391 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3392 3393 /* statistics normally done by ieee80211_tx_h_stats (but that 3394 * has to consider fragmentation, so is more complex) 3395 */ 3396 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3397 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3398 3399 if (pn_offs) { 3400 u64 pn; 3401 u8 *crypto_hdr = skb->data + pn_offs; 3402 3403 switch (key->conf.cipher) { 3404 case WLAN_CIPHER_SUITE_CCMP: 3405 case WLAN_CIPHER_SUITE_CCMP_256: 3406 case WLAN_CIPHER_SUITE_GCMP: 3407 case WLAN_CIPHER_SUITE_GCMP_256: 3408 pn = atomic64_inc_return(&key->conf.tx_pn); 3409 crypto_hdr[0] = pn; 3410 crypto_hdr[1] = pn >> 8; 3411 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3412 crypto_hdr[4] = pn >> 16; 3413 crypto_hdr[5] = pn >> 24; 3414 crypto_hdr[6] = pn >> 32; 3415 crypto_hdr[7] = pn >> 40; 3416 break; 3417 } 3418 } 3419 } 3420 3421 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3422 struct sta_info *sta, 3423 struct ieee80211_fast_tx *fast_tx, 3424 struct sk_buff *skb) 3425 { 3426 struct ieee80211_local *local = sdata->local; 3427 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3428 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3429 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3430 struct ethhdr eth; 3431 struct ieee80211_tx_info *info; 3432 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3433 struct ieee80211_tx_data tx; 3434 ieee80211_tx_result r; 3435 struct tid_ampdu_tx *tid_tx = NULL; 3436 u8 tid = IEEE80211_NUM_TIDS; 3437 3438 /* control port protocol needs a lot of special handling */ 3439 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3440 return false; 3441 3442 /* only RFC 1042 SNAP */ 3443 if (ethertype < ETH_P_802_3_MIN) 3444 return false; 3445 3446 /* don't handle TX status request here either */ 3447 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3448 return false; 3449 3450 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3451 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3452 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3453 if (tid_tx) { 3454 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3455 return false; 3456 if (tid_tx->timeout) 3457 tid_tx->last_tx = jiffies; 3458 } 3459 } 3460 3461 /* after this point (skb is modified) we cannot return false */ 3462 3463 if (skb_shared(skb)) { 3464 struct sk_buff *tmp_skb = skb; 3465 3466 skb = skb_clone(skb, GFP_ATOMIC); 3467 kfree_skb(tmp_skb); 3468 3469 if (!skb) 3470 return true; 3471 } 3472 3473 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3474 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3475 return true; 3476 3477 /* will not be crypto-handled beyond what we do here, so use false 3478 * as the may-encrypt argument for the resize to not account for 3479 * more room than we already have in 'extra_head' 3480 */ 3481 if (unlikely(ieee80211_skb_resize(sdata, skb, 3482 max_t(int, extra_head + hw_headroom - 3483 skb_headroom(skb), 0), 3484 ENCRYPT_NO))) { 3485 kfree_skb(skb); 3486 return true; 3487 } 3488 3489 memcpy(ð, skb->data, ETH_HLEN - 2); 3490 hdr = skb_push(skb, extra_head); 3491 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3492 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3493 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3494 3495 info = IEEE80211_SKB_CB(skb); 3496 memset(info, 0, sizeof(*info)); 3497 info->band = fast_tx->band; 3498 info->control.vif = &sdata->vif; 3499 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3500 IEEE80211_TX_CTL_DONTFRAG | 3501 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3502 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3503 3504 #ifdef CONFIG_MAC80211_DEBUGFS 3505 if (local->force_tx_status) 3506 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3507 #endif 3508 3509 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3510 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3511 *ieee80211_get_qos_ctl(hdr) = tid; 3512 } 3513 3514 __skb_queue_head_init(&tx.skbs); 3515 3516 tx.flags = IEEE80211_TX_UNICAST; 3517 tx.local = local; 3518 tx.sdata = sdata; 3519 tx.sta = sta; 3520 tx.key = fast_tx->key; 3521 3522 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3523 tx.skb = skb; 3524 r = ieee80211_tx_h_rate_ctrl(&tx); 3525 skb = tx.skb; 3526 tx.skb = NULL; 3527 3528 if (r != TX_CONTINUE) { 3529 if (r != TX_QUEUED) 3530 kfree_skb(skb); 3531 return true; 3532 } 3533 } 3534 3535 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3536 return true; 3537 3538 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3539 fast_tx->key, skb); 3540 3541 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3542 sdata = container_of(sdata->bss, 3543 struct ieee80211_sub_if_data, u.ap); 3544 3545 __skb_queue_tail(&tx.skbs, skb); 3546 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3547 return true; 3548 } 3549 3550 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3551 struct ieee80211_txq *txq) 3552 { 3553 struct ieee80211_local *local = hw_to_local(hw); 3554 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3555 struct ieee80211_hdr *hdr; 3556 struct sk_buff *skb = NULL; 3557 struct fq *fq = &local->fq; 3558 struct fq_tin *tin = &txqi->tin; 3559 struct ieee80211_tx_info *info; 3560 struct ieee80211_tx_data tx; 3561 ieee80211_tx_result r; 3562 struct ieee80211_vif *vif = txq->vif; 3563 3564 WARN_ON_ONCE(softirq_count() == 0); 3565 3566 if (!ieee80211_txq_airtime_check(hw, txq)) 3567 return NULL; 3568 3569 begin: 3570 spin_lock_bh(&fq->lock); 3571 3572 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3573 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3574 goto out; 3575 3576 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3577 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3578 goto out; 3579 } 3580 3581 /* Make sure fragments stay together. */ 3582 skb = __skb_dequeue(&txqi->frags); 3583 if (skb) 3584 goto out; 3585 3586 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3587 if (!skb) 3588 goto out; 3589 3590 spin_unlock_bh(&fq->lock); 3591 3592 hdr = (struct ieee80211_hdr *)skb->data; 3593 info = IEEE80211_SKB_CB(skb); 3594 3595 memset(&tx, 0, sizeof(tx)); 3596 __skb_queue_head_init(&tx.skbs); 3597 tx.local = local; 3598 tx.skb = skb; 3599 tx.sdata = vif_to_sdata(info->control.vif); 3600 3601 if (txq->sta) { 3602 tx.sta = container_of(txq->sta, struct sta_info, sta); 3603 /* 3604 * Drop unicast frames to unauthorised stations unless they are 3605 * injected frames or EAPOL frames from the local station. 3606 */ 3607 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3608 ieee80211_is_data(hdr->frame_control) && 3609 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3610 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3611 !is_multicast_ether_addr(hdr->addr1) && 3612 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3613 (!(info->control.flags & 3614 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3615 !ether_addr_equal(tx.sdata->vif.addr, 3616 hdr->addr2)))) { 3617 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3618 ieee80211_free_txskb(&local->hw, skb); 3619 goto begin; 3620 } 3621 } 3622 3623 /* 3624 * The key can be removed while the packet was queued, so need to call 3625 * this here to get the current key. 3626 */ 3627 r = ieee80211_tx_h_select_key(&tx); 3628 if (r != TX_CONTINUE) { 3629 ieee80211_free_txskb(&local->hw, skb); 3630 goto begin; 3631 } 3632 3633 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3634 info->flags |= IEEE80211_TX_CTL_AMPDU; 3635 else 3636 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3637 3638 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 3639 goto encap_out; 3640 3641 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3642 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3643 sta); 3644 u8 pn_offs = 0; 3645 3646 if (tx.key && 3647 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3648 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3649 3650 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3651 tx.key, skb); 3652 } else { 3653 if (invoke_tx_handlers_late(&tx)) 3654 goto begin; 3655 3656 skb = __skb_dequeue(&tx.skbs); 3657 3658 if (!skb_queue_empty(&tx.skbs)) { 3659 spin_lock_bh(&fq->lock); 3660 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3661 spin_unlock_bh(&fq->lock); 3662 } 3663 } 3664 3665 if (skb_has_frag_list(skb) && 3666 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3667 if (skb_linearize(skb)) { 3668 ieee80211_free_txskb(&local->hw, skb); 3669 goto begin; 3670 } 3671 } 3672 3673 switch (tx.sdata->vif.type) { 3674 case NL80211_IFTYPE_MONITOR: 3675 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3676 vif = &tx.sdata->vif; 3677 break; 3678 } 3679 tx.sdata = rcu_dereference(local->monitor_sdata); 3680 if (tx.sdata) { 3681 vif = &tx.sdata->vif; 3682 info->hw_queue = 3683 vif->hw_queue[skb_get_queue_mapping(skb)]; 3684 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3685 ieee80211_free_txskb(&local->hw, skb); 3686 goto begin; 3687 } else { 3688 vif = NULL; 3689 } 3690 break; 3691 case NL80211_IFTYPE_AP_VLAN: 3692 tx.sdata = container_of(tx.sdata->bss, 3693 struct ieee80211_sub_if_data, u.ap); 3694 fallthrough; 3695 default: 3696 vif = &tx.sdata->vif; 3697 break; 3698 } 3699 3700 encap_out: 3701 IEEE80211_SKB_CB(skb)->control.vif = vif; 3702 3703 if (vif && 3704 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3705 bool ampdu = txq->ac != IEEE80211_AC_VO; 3706 u32 airtime; 3707 3708 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3709 skb->len, ampdu); 3710 if (airtime) { 3711 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3712 ieee80211_sta_update_pending_airtime(local, tx.sta, 3713 txq->ac, 3714 airtime, 3715 false); 3716 } 3717 } 3718 3719 return skb; 3720 3721 out: 3722 spin_unlock_bh(&fq->lock); 3723 3724 return skb; 3725 } 3726 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3727 3728 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3729 { 3730 struct ieee80211_local *local = hw_to_local(hw); 3731 struct ieee80211_txq *ret = NULL; 3732 struct txq_info *txqi = NULL, *head = NULL; 3733 bool found_eligible_txq = false; 3734 3735 spin_lock_bh(&local->active_txq_lock[ac]); 3736 3737 begin: 3738 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3739 struct txq_info, 3740 schedule_order); 3741 if (!txqi) 3742 goto out; 3743 3744 if (txqi == head) { 3745 if (!found_eligible_txq) 3746 goto out; 3747 else 3748 found_eligible_txq = false; 3749 } 3750 3751 if (!head) 3752 head = txqi; 3753 3754 if (txqi->txq.sta) { 3755 struct sta_info *sta = container_of(txqi->txq.sta, 3756 struct sta_info, sta); 3757 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3758 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3759 3760 if (aql_check) 3761 found_eligible_txq = true; 3762 3763 if (deficit < 0) 3764 sta->airtime[txqi->txq.ac].deficit += 3765 sta->airtime_weight; 3766 3767 if (deficit < 0 || !aql_check) { 3768 list_move_tail(&txqi->schedule_order, 3769 &local->active_txqs[txqi->txq.ac]); 3770 goto begin; 3771 } 3772 } 3773 3774 3775 if (txqi->schedule_round == local->schedule_round[ac]) 3776 goto out; 3777 3778 list_del_init(&txqi->schedule_order); 3779 txqi->schedule_round = local->schedule_round[ac]; 3780 ret = &txqi->txq; 3781 3782 out: 3783 spin_unlock_bh(&local->active_txq_lock[ac]); 3784 return ret; 3785 } 3786 EXPORT_SYMBOL(ieee80211_next_txq); 3787 3788 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3789 struct ieee80211_txq *txq, 3790 bool force) 3791 { 3792 struct ieee80211_local *local = hw_to_local(hw); 3793 struct txq_info *txqi = to_txq_info(txq); 3794 3795 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3796 3797 if (list_empty(&txqi->schedule_order) && 3798 (force || !skb_queue_empty(&txqi->frags) || 3799 txqi->tin.backlog_packets)) { 3800 /* If airtime accounting is active, always enqueue STAs at the 3801 * head of the list to ensure that they only get moved to the 3802 * back by the airtime DRR scheduler once they have a negative 3803 * deficit. A station that already has a negative deficit will 3804 * get immediately moved to the back of the list on the next 3805 * call to ieee80211_next_txq(). 3806 */ 3807 if (txqi->txq.sta && local->airtime_flags && 3808 wiphy_ext_feature_isset(local->hw.wiphy, 3809 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3810 list_add(&txqi->schedule_order, 3811 &local->active_txqs[txq->ac]); 3812 else 3813 list_add_tail(&txqi->schedule_order, 3814 &local->active_txqs[txq->ac]); 3815 } 3816 3817 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3818 } 3819 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3820 3821 DEFINE_STATIC_KEY_FALSE(aql_disable); 3822 3823 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3824 struct ieee80211_txq *txq) 3825 { 3826 struct sta_info *sta; 3827 struct ieee80211_local *local = hw_to_local(hw); 3828 3829 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3830 return true; 3831 3832 if (static_branch_unlikely(&aql_disable)) 3833 return true; 3834 3835 if (!txq->sta) 3836 return true; 3837 3838 sta = container_of(txq->sta, struct sta_info, sta); 3839 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3840 sta->airtime[txq->ac].aql_limit_low) 3841 return true; 3842 3843 if (atomic_read(&local->aql_total_pending_airtime) < 3844 local->aql_threshold && 3845 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3846 sta->airtime[txq->ac].aql_limit_high) 3847 return true; 3848 3849 return false; 3850 } 3851 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3852 3853 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3854 struct ieee80211_txq *txq) 3855 { 3856 struct ieee80211_local *local = hw_to_local(hw); 3857 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3858 struct sta_info *sta; 3859 u8 ac = txq->ac; 3860 3861 spin_lock_bh(&local->active_txq_lock[ac]); 3862 3863 if (!txqi->txq.sta) 3864 goto out; 3865 3866 if (list_empty(&txqi->schedule_order)) 3867 goto out; 3868 3869 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3870 schedule_order) { 3871 if (iter == txqi) 3872 break; 3873 3874 if (!iter->txq.sta) { 3875 list_move_tail(&iter->schedule_order, 3876 &local->active_txqs[ac]); 3877 continue; 3878 } 3879 sta = container_of(iter->txq.sta, struct sta_info, sta); 3880 if (sta->airtime[ac].deficit < 0) 3881 sta->airtime[ac].deficit += sta->airtime_weight; 3882 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3883 } 3884 3885 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3886 if (sta->airtime[ac].deficit >= 0) 3887 goto out; 3888 3889 sta->airtime[ac].deficit += sta->airtime_weight; 3890 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3891 spin_unlock_bh(&local->active_txq_lock[ac]); 3892 3893 return false; 3894 out: 3895 if (!list_empty(&txqi->schedule_order)) 3896 list_del_init(&txqi->schedule_order); 3897 spin_unlock_bh(&local->active_txq_lock[ac]); 3898 3899 return true; 3900 } 3901 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3902 3903 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3904 { 3905 struct ieee80211_local *local = hw_to_local(hw); 3906 3907 spin_lock_bh(&local->active_txq_lock[ac]); 3908 local->schedule_round[ac]++; 3909 spin_unlock_bh(&local->active_txq_lock[ac]); 3910 } 3911 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3912 3913 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3914 struct net_device *dev, 3915 u32 info_flags, 3916 u32 ctrl_flags, 3917 u64 *cookie) 3918 { 3919 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3920 struct ieee80211_local *local = sdata->local; 3921 struct sta_info *sta; 3922 struct sk_buff *next; 3923 3924 if (unlikely(skb->len < ETH_HLEN)) { 3925 kfree_skb(skb); 3926 return; 3927 } 3928 3929 rcu_read_lock(); 3930 3931 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3932 goto out_free; 3933 3934 if (IS_ERR(sta)) 3935 sta = NULL; 3936 3937 if (local->ops->wake_tx_queue) { 3938 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3939 skb_set_queue_mapping(skb, queue); 3940 skb_get_hash(skb); 3941 } 3942 3943 if (sta) { 3944 struct ieee80211_fast_tx *fast_tx; 3945 3946 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3947 3948 fast_tx = rcu_dereference(sta->fast_tx); 3949 3950 if (fast_tx && 3951 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3952 goto out; 3953 } 3954 3955 if (skb_is_gso(skb)) { 3956 struct sk_buff *segs; 3957 3958 segs = skb_gso_segment(skb, 0); 3959 if (IS_ERR(segs)) { 3960 goto out_free; 3961 } else if (segs) { 3962 consume_skb(skb); 3963 skb = segs; 3964 } 3965 } else { 3966 /* we cannot process non-linear frames on this path */ 3967 if (skb_linearize(skb)) { 3968 kfree_skb(skb); 3969 goto out; 3970 } 3971 3972 /* the frame could be fragmented, software-encrypted, and other 3973 * things so we cannot really handle checksum offload with it - 3974 * fix it up in software before we handle anything else. 3975 */ 3976 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3977 skb_set_transport_header(skb, 3978 skb_checksum_start_offset(skb)); 3979 if (skb_checksum_help(skb)) 3980 goto out_free; 3981 } 3982 } 3983 3984 skb_list_walk_safe(skb, skb, next) { 3985 skb_mark_not_on_list(skb); 3986 3987 if (skb->protocol == sdata->control_port_protocol) 3988 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 3989 3990 skb = ieee80211_build_hdr(sdata, skb, info_flags, 3991 sta, ctrl_flags, cookie); 3992 if (IS_ERR(skb)) { 3993 kfree_skb_list(next); 3994 goto out; 3995 } 3996 3997 dev_sw_netstats_tx_add(dev, 1, skb->len); 3998 3999 ieee80211_xmit(sdata, sta, skb); 4000 } 4001 goto out; 4002 out_free: 4003 kfree_skb(skb); 4004 out: 4005 rcu_read_unlock(); 4006 } 4007 4008 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4009 { 4010 struct ethhdr *eth; 4011 int err; 4012 4013 err = skb_ensure_writable(skb, ETH_HLEN); 4014 if (unlikely(err)) 4015 return err; 4016 4017 eth = (void *)skb->data; 4018 ether_addr_copy(eth->h_dest, sta->sta.addr); 4019 4020 return 0; 4021 } 4022 4023 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4024 struct net_device *dev) 4025 { 4026 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4027 const struct ethhdr *eth = (void *)skb->data; 4028 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4029 __be16 ethertype; 4030 4031 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4032 return false; 4033 4034 switch (sdata->vif.type) { 4035 case NL80211_IFTYPE_AP_VLAN: 4036 if (sdata->u.vlan.sta) 4037 return false; 4038 if (sdata->wdev.use_4addr) 4039 return false; 4040 fallthrough; 4041 case NL80211_IFTYPE_AP: 4042 /* check runtime toggle for this bss */ 4043 if (!sdata->bss->multicast_to_unicast) 4044 return false; 4045 break; 4046 default: 4047 return false; 4048 } 4049 4050 /* multicast to unicast conversion only for some payload */ 4051 ethertype = eth->h_proto; 4052 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4053 ethertype = ethvlan->h_vlan_encapsulated_proto; 4054 switch (ethertype) { 4055 case htons(ETH_P_ARP): 4056 case htons(ETH_P_IP): 4057 case htons(ETH_P_IPV6): 4058 break; 4059 default: 4060 return false; 4061 } 4062 4063 return true; 4064 } 4065 4066 static void 4067 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4068 struct sk_buff_head *queue) 4069 { 4070 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4071 struct ieee80211_local *local = sdata->local; 4072 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4073 struct sta_info *sta, *first = NULL; 4074 struct sk_buff *cloned_skb; 4075 4076 rcu_read_lock(); 4077 4078 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4079 if (sdata != sta->sdata) 4080 /* AP-VLAN mismatch */ 4081 continue; 4082 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4083 /* do not send back to source */ 4084 continue; 4085 if (!first) { 4086 first = sta; 4087 continue; 4088 } 4089 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4090 if (!cloned_skb) 4091 goto multicast; 4092 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4093 dev_kfree_skb(cloned_skb); 4094 goto multicast; 4095 } 4096 __skb_queue_tail(queue, cloned_skb); 4097 } 4098 4099 if (likely(first)) { 4100 if (unlikely(ieee80211_change_da(skb, first))) 4101 goto multicast; 4102 __skb_queue_tail(queue, skb); 4103 } else { 4104 /* no STA connected, drop */ 4105 kfree_skb(skb); 4106 skb = NULL; 4107 } 4108 4109 goto out; 4110 multicast: 4111 __skb_queue_purge(queue); 4112 __skb_queue_tail(queue, skb); 4113 out: 4114 rcu_read_unlock(); 4115 } 4116 4117 /** 4118 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4119 * @skb: packet to be sent 4120 * @dev: incoming interface 4121 * 4122 * On failure skb will be freed. 4123 */ 4124 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4125 struct net_device *dev) 4126 { 4127 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4128 struct sk_buff_head queue; 4129 4130 __skb_queue_head_init(&queue); 4131 ieee80211_convert_to_unicast(skb, dev, &queue); 4132 while ((skb = __skb_dequeue(&queue))) 4133 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4134 } else { 4135 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4136 } 4137 4138 return NETDEV_TX_OK; 4139 } 4140 4141 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4142 struct sk_buff *skb, int led_len, 4143 struct sta_info *sta, 4144 bool txpending) 4145 { 4146 struct ieee80211_local *local = sdata->local; 4147 struct ieee80211_tx_control control = {}; 4148 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4149 struct ieee80211_sta *pubsta = NULL; 4150 unsigned long flags; 4151 int q = info->hw_queue; 4152 4153 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4154 return true; 4155 4156 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4157 4158 if (local->queue_stop_reasons[q] || 4159 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4160 if (txpending) 4161 skb_queue_head(&local->pending[q], skb); 4162 else 4163 skb_queue_tail(&local->pending[q], skb); 4164 4165 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4166 4167 return false; 4168 } 4169 4170 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4171 4172 if (sta && sta->uploaded) 4173 pubsta = &sta->sta; 4174 4175 control.sta = pubsta; 4176 4177 drv_tx(local, &control, skb); 4178 4179 return true; 4180 } 4181 4182 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4183 struct net_device *dev, struct sta_info *sta, 4184 struct ieee80211_key *key, struct sk_buff *skb) 4185 { 4186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4187 struct ieee80211_local *local = sdata->local; 4188 struct tid_ampdu_tx *tid_tx; 4189 u8 tid; 4190 4191 if (local->ops->wake_tx_queue) { 4192 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4193 skb_set_queue_mapping(skb, queue); 4194 skb_get_hash(skb); 4195 } 4196 4197 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4198 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4199 goto out_free; 4200 4201 memset(info, 0, sizeof(*info)); 4202 4203 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4204 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4205 if (tid_tx) { 4206 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4207 /* fall back to non-offload slow path */ 4208 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4209 return; 4210 } 4211 4212 info->flags |= IEEE80211_TX_CTL_AMPDU; 4213 if (tid_tx->timeout) 4214 tid_tx->last_tx = jiffies; 4215 } 4216 4217 if (unlikely(skb->sk && 4218 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4219 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4220 &info->flags, NULL); 4221 4222 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4223 4224 dev_sw_netstats_tx_add(dev, 1, skb->len); 4225 4226 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4227 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4228 4229 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4230 sdata = container_of(sdata->bss, 4231 struct ieee80211_sub_if_data, u.ap); 4232 4233 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4234 info->control.vif = &sdata->vif; 4235 4236 if (key) 4237 info->control.hw_key = &key->conf; 4238 4239 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4240 4241 return; 4242 4243 out_free: 4244 kfree_skb(skb); 4245 } 4246 4247 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4248 struct net_device *dev) 4249 { 4250 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4251 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4252 struct ieee80211_key *key; 4253 struct sta_info *sta; 4254 4255 if (unlikely(skb->len < ETH_HLEN)) { 4256 kfree_skb(skb); 4257 return NETDEV_TX_OK; 4258 } 4259 4260 rcu_read_lock(); 4261 4262 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4263 kfree_skb(skb); 4264 goto out; 4265 } 4266 4267 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4268 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4269 sdata->control_port_protocol == ehdr->h_proto)) 4270 goto skip_offload; 4271 4272 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4273 if (!key) 4274 key = rcu_dereference(sdata->default_unicast_key); 4275 4276 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4277 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4278 goto skip_offload; 4279 4280 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4281 goto out; 4282 4283 skip_offload: 4284 ieee80211_subif_start_xmit(skb, dev); 4285 out: 4286 rcu_read_unlock(); 4287 4288 return NETDEV_TX_OK; 4289 } 4290 4291 struct sk_buff * 4292 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4293 struct sk_buff *skb, u32 info_flags) 4294 { 4295 struct ieee80211_hdr *hdr; 4296 struct ieee80211_tx_data tx = { 4297 .local = sdata->local, 4298 .sdata = sdata, 4299 }; 4300 struct sta_info *sta; 4301 4302 rcu_read_lock(); 4303 4304 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4305 kfree_skb(skb); 4306 skb = ERR_PTR(-EINVAL); 4307 goto out; 4308 } 4309 4310 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4311 if (IS_ERR(skb)) 4312 goto out; 4313 4314 hdr = (void *)skb->data; 4315 tx.sta = sta_info_get(sdata, hdr->addr1); 4316 tx.skb = skb; 4317 4318 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4319 rcu_read_unlock(); 4320 kfree_skb(skb); 4321 return ERR_PTR(-EINVAL); 4322 } 4323 4324 out: 4325 rcu_read_unlock(); 4326 return skb; 4327 } 4328 4329 /* 4330 * ieee80211_clear_tx_pending may not be called in a context where 4331 * it is possible that it packets could come in again. 4332 */ 4333 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4334 { 4335 struct sk_buff *skb; 4336 int i; 4337 4338 for (i = 0; i < local->hw.queues; i++) { 4339 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4340 ieee80211_free_txskb(&local->hw, skb); 4341 } 4342 } 4343 4344 /* 4345 * Returns false if the frame couldn't be transmitted but was queued instead, 4346 * which in this case means re-queued -- take as an indication to stop sending 4347 * more pending frames. 4348 */ 4349 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4350 struct sk_buff *skb) 4351 { 4352 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4353 struct ieee80211_sub_if_data *sdata; 4354 struct sta_info *sta; 4355 struct ieee80211_hdr *hdr; 4356 bool result; 4357 struct ieee80211_chanctx_conf *chanctx_conf; 4358 4359 sdata = vif_to_sdata(info->control.vif); 4360 4361 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4362 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4363 if (unlikely(!chanctx_conf)) { 4364 dev_kfree_skb(skb); 4365 return true; 4366 } 4367 info->band = chanctx_conf->def.chan->band; 4368 result = ieee80211_tx(sdata, NULL, skb, true); 4369 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4370 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4371 dev_kfree_skb(skb); 4372 return true; 4373 } 4374 4375 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4376 sta = NULL; 4377 4378 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4379 } else { 4380 struct sk_buff_head skbs; 4381 4382 __skb_queue_head_init(&skbs); 4383 __skb_queue_tail(&skbs, skb); 4384 4385 hdr = (struct ieee80211_hdr *)skb->data; 4386 sta = sta_info_get(sdata, hdr->addr1); 4387 4388 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4389 } 4390 4391 return result; 4392 } 4393 4394 /* 4395 * Transmit all pending packets. Called from tasklet. 4396 */ 4397 void ieee80211_tx_pending(struct tasklet_struct *t) 4398 { 4399 struct ieee80211_local *local = from_tasklet(local, t, 4400 tx_pending_tasklet); 4401 unsigned long flags; 4402 int i; 4403 bool txok; 4404 4405 rcu_read_lock(); 4406 4407 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4408 for (i = 0; i < local->hw.queues; i++) { 4409 /* 4410 * If queue is stopped by something other than due to pending 4411 * frames, or we have no pending frames, proceed to next queue. 4412 */ 4413 if (local->queue_stop_reasons[i] || 4414 skb_queue_empty(&local->pending[i])) 4415 continue; 4416 4417 while (!skb_queue_empty(&local->pending[i])) { 4418 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4419 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4420 4421 if (WARN_ON(!info->control.vif)) { 4422 ieee80211_free_txskb(&local->hw, skb); 4423 continue; 4424 } 4425 4426 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4427 flags); 4428 4429 txok = ieee80211_tx_pending_skb(local, skb); 4430 spin_lock_irqsave(&local->queue_stop_reason_lock, 4431 flags); 4432 if (!txok) 4433 break; 4434 } 4435 4436 if (skb_queue_empty(&local->pending[i])) 4437 ieee80211_propagate_queue_wake(local, i); 4438 } 4439 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4440 4441 rcu_read_unlock(); 4442 } 4443 4444 /* functions for drivers to get certain frames */ 4445 4446 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4447 struct ps_data *ps, struct sk_buff *skb, 4448 bool is_template) 4449 { 4450 u8 *pos, *tim; 4451 int aid0 = 0; 4452 int i, have_bits = 0, n1, n2; 4453 4454 /* Generate bitmap for TIM only if there are any STAs in power save 4455 * mode. */ 4456 if (atomic_read(&ps->num_sta_ps) > 0) 4457 /* in the hope that this is faster than 4458 * checking byte-for-byte */ 4459 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4460 IEEE80211_MAX_AID+1); 4461 if (!is_template) { 4462 if (ps->dtim_count == 0) 4463 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4464 else 4465 ps->dtim_count--; 4466 } 4467 4468 tim = pos = skb_put(skb, 6); 4469 *pos++ = WLAN_EID_TIM; 4470 *pos++ = 4; 4471 *pos++ = ps->dtim_count; 4472 *pos++ = sdata->vif.bss_conf.dtim_period; 4473 4474 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4475 aid0 = 1; 4476 4477 ps->dtim_bc_mc = aid0 == 1; 4478 4479 if (have_bits) { 4480 /* Find largest even number N1 so that bits numbered 1 through 4481 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4482 * (N2 + 1) x 8 through 2007 are 0. */ 4483 n1 = 0; 4484 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4485 if (ps->tim[i]) { 4486 n1 = i & 0xfe; 4487 break; 4488 } 4489 } 4490 n2 = n1; 4491 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4492 if (ps->tim[i]) { 4493 n2 = i; 4494 break; 4495 } 4496 } 4497 4498 /* Bitmap control */ 4499 *pos++ = n1 | aid0; 4500 /* Part Virt Bitmap */ 4501 skb_put(skb, n2 - n1); 4502 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4503 4504 tim[1] = n2 - n1 + 4; 4505 } else { 4506 *pos++ = aid0; /* Bitmap control */ 4507 *pos++ = 0; /* Part Virt Bitmap */ 4508 } 4509 } 4510 4511 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4512 struct ps_data *ps, struct sk_buff *skb, 4513 bool is_template) 4514 { 4515 struct ieee80211_local *local = sdata->local; 4516 4517 /* 4518 * Not very nice, but we want to allow the driver to call 4519 * ieee80211_beacon_get() as a response to the set_tim() 4520 * callback. That, however, is already invoked under the 4521 * sta_lock to guarantee consistent and race-free update 4522 * of the tim bitmap in mac80211 and the driver. 4523 */ 4524 if (local->tim_in_locked_section) { 4525 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4526 } else { 4527 spin_lock_bh(&local->tim_lock); 4528 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4529 spin_unlock_bh(&local->tim_lock); 4530 } 4531 4532 return 0; 4533 } 4534 4535 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4536 struct beacon_data *beacon) 4537 { 4538 struct probe_resp *resp; 4539 u8 *beacon_data; 4540 size_t beacon_data_len; 4541 int i; 4542 u8 count = beacon->cntdwn_current_counter; 4543 4544 switch (sdata->vif.type) { 4545 case NL80211_IFTYPE_AP: 4546 beacon_data = beacon->tail; 4547 beacon_data_len = beacon->tail_len; 4548 break; 4549 case NL80211_IFTYPE_ADHOC: 4550 beacon_data = beacon->head; 4551 beacon_data_len = beacon->head_len; 4552 break; 4553 case NL80211_IFTYPE_MESH_POINT: 4554 beacon_data = beacon->head; 4555 beacon_data_len = beacon->head_len; 4556 break; 4557 default: 4558 return; 4559 } 4560 4561 rcu_read_lock(); 4562 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4563 resp = rcu_dereference(sdata->u.ap.probe_resp); 4564 4565 if (beacon->cntdwn_counter_offsets[i]) { 4566 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4567 beacon_data_len)) { 4568 rcu_read_unlock(); 4569 return; 4570 } 4571 4572 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4573 } 4574 4575 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4576 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4577 } 4578 rcu_read_unlock(); 4579 } 4580 4581 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4582 { 4583 beacon->cntdwn_current_counter--; 4584 4585 /* the counter should never reach 0 */ 4586 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4587 4588 return beacon->cntdwn_current_counter; 4589 } 4590 4591 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4592 { 4593 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4594 struct beacon_data *beacon = NULL; 4595 u8 count = 0; 4596 4597 rcu_read_lock(); 4598 4599 if (sdata->vif.type == NL80211_IFTYPE_AP) 4600 beacon = rcu_dereference(sdata->u.ap.beacon); 4601 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4602 beacon = rcu_dereference(sdata->u.ibss.presp); 4603 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4604 beacon = rcu_dereference(sdata->u.mesh.beacon); 4605 4606 if (!beacon) 4607 goto unlock; 4608 4609 count = __ieee80211_beacon_update_cntdwn(beacon); 4610 4611 unlock: 4612 rcu_read_unlock(); 4613 return count; 4614 } 4615 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4616 4617 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4618 { 4619 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4620 struct beacon_data *beacon = NULL; 4621 4622 rcu_read_lock(); 4623 4624 if (sdata->vif.type == NL80211_IFTYPE_AP) 4625 beacon = rcu_dereference(sdata->u.ap.beacon); 4626 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4627 beacon = rcu_dereference(sdata->u.ibss.presp); 4628 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4629 beacon = rcu_dereference(sdata->u.mesh.beacon); 4630 4631 if (!beacon) 4632 goto unlock; 4633 4634 if (counter < beacon->cntdwn_current_counter) 4635 beacon->cntdwn_current_counter = counter; 4636 4637 unlock: 4638 rcu_read_unlock(); 4639 } 4640 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4641 4642 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4643 { 4644 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4645 struct beacon_data *beacon = NULL; 4646 u8 *beacon_data; 4647 size_t beacon_data_len; 4648 int ret = false; 4649 4650 if (!ieee80211_sdata_running(sdata)) 4651 return false; 4652 4653 rcu_read_lock(); 4654 if (vif->type == NL80211_IFTYPE_AP) { 4655 struct ieee80211_if_ap *ap = &sdata->u.ap; 4656 4657 beacon = rcu_dereference(ap->beacon); 4658 if (WARN_ON(!beacon || !beacon->tail)) 4659 goto out; 4660 beacon_data = beacon->tail; 4661 beacon_data_len = beacon->tail_len; 4662 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4663 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4664 4665 beacon = rcu_dereference(ifibss->presp); 4666 if (!beacon) 4667 goto out; 4668 4669 beacon_data = beacon->head; 4670 beacon_data_len = beacon->head_len; 4671 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4672 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4673 4674 beacon = rcu_dereference(ifmsh->beacon); 4675 if (!beacon) 4676 goto out; 4677 4678 beacon_data = beacon->head; 4679 beacon_data_len = beacon->head_len; 4680 } else { 4681 WARN_ON(1); 4682 goto out; 4683 } 4684 4685 if (!beacon->cntdwn_counter_offsets[0]) 4686 goto out; 4687 4688 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4689 goto out; 4690 4691 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4692 ret = true; 4693 4694 out: 4695 rcu_read_unlock(); 4696 4697 return ret; 4698 } 4699 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4700 4701 static int ieee80211_beacon_protect(struct sk_buff *skb, 4702 struct ieee80211_local *local, 4703 struct ieee80211_sub_if_data *sdata) 4704 { 4705 ieee80211_tx_result res; 4706 struct ieee80211_tx_data tx; 4707 struct sk_buff *check_skb; 4708 4709 memset(&tx, 0, sizeof(tx)); 4710 tx.key = rcu_dereference(sdata->default_beacon_key); 4711 if (!tx.key) 4712 return 0; 4713 tx.local = local; 4714 tx.sdata = sdata; 4715 __skb_queue_head_init(&tx.skbs); 4716 __skb_queue_tail(&tx.skbs, skb); 4717 res = ieee80211_tx_h_encrypt(&tx); 4718 check_skb = __skb_dequeue(&tx.skbs); 4719 /* we may crash after this, but it'd be a bug in crypto */ 4720 WARN_ON(check_skb != skb); 4721 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4722 return -EINVAL; 4723 4724 return 0; 4725 } 4726 4727 static struct sk_buff * 4728 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4729 struct ieee80211_vif *vif, 4730 struct ieee80211_mutable_offsets *offs, 4731 bool is_template) 4732 { 4733 struct ieee80211_local *local = hw_to_local(hw); 4734 struct beacon_data *beacon = NULL; 4735 struct sk_buff *skb = NULL; 4736 struct ieee80211_tx_info *info; 4737 struct ieee80211_sub_if_data *sdata = NULL; 4738 enum nl80211_band band; 4739 struct ieee80211_tx_rate_control txrc; 4740 struct ieee80211_chanctx_conf *chanctx_conf; 4741 int csa_off_base = 0; 4742 4743 rcu_read_lock(); 4744 4745 sdata = vif_to_sdata(vif); 4746 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4747 4748 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4749 goto out; 4750 4751 if (offs) 4752 memset(offs, 0, sizeof(*offs)); 4753 4754 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4755 struct ieee80211_if_ap *ap = &sdata->u.ap; 4756 4757 beacon = rcu_dereference(ap->beacon); 4758 if (beacon) { 4759 if (beacon->cntdwn_counter_offsets[0]) { 4760 if (!is_template) 4761 ieee80211_beacon_update_cntdwn(vif); 4762 4763 ieee80211_set_beacon_cntdwn(sdata, beacon); 4764 } 4765 4766 /* 4767 * headroom, head length, 4768 * tail length and maximum TIM length 4769 */ 4770 skb = dev_alloc_skb(local->tx_headroom + 4771 beacon->head_len + 4772 beacon->tail_len + 256 + 4773 local->hw.extra_beacon_tailroom); 4774 if (!skb) 4775 goto out; 4776 4777 skb_reserve(skb, local->tx_headroom); 4778 skb_put_data(skb, beacon->head, beacon->head_len); 4779 4780 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4781 is_template); 4782 4783 if (offs) { 4784 offs->tim_offset = beacon->head_len; 4785 offs->tim_length = skb->len - beacon->head_len; 4786 4787 /* for AP the csa offsets are from tail */ 4788 csa_off_base = skb->len; 4789 } 4790 4791 if (beacon->tail) 4792 skb_put_data(skb, beacon->tail, 4793 beacon->tail_len); 4794 4795 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4796 goto out; 4797 } else 4798 goto out; 4799 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4800 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4801 struct ieee80211_hdr *hdr; 4802 4803 beacon = rcu_dereference(ifibss->presp); 4804 if (!beacon) 4805 goto out; 4806 4807 if (beacon->cntdwn_counter_offsets[0]) { 4808 if (!is_template) 4809 __ieee80211_beacon_update_cntdwn(beacon); 4810 4811 ieee80211_set_beacon_cntdwn(sdata, beacon); 4812 } 4813 4814 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4815 local->hw.extra_beacon_tailroom); 4816 if (!skb) 4817 goto out; 4818 skb_reserve(skb, local->tx_headroom); 4819 skb_put_data(skb, beacon->head, beacon->head_len); 4820 4821 hdr = (struct ieee80211_hdr *) skb->data; 4822 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4823 IEEE80211_STYPE_BEACON); 4824 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4825 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4826 4827 beacon = rcu_dereference(ifmsh->beacon); 4828 if (!beacon) 4829 goto out; 4830 4831 if (beacon->cntdwn_counter_offsets[0]) { 4832 if (!is_template) 4833 /* TODO: For mesh csa_counter is in TU, so 4834 * decrementing it by one isn't correct, but 4835 * for now we leave it consistent with overall 4836 * mac80211's behavior. 4837 */ 4838 __ieee80211_beacon_update_cntdwn(beacon); 4839 4840 ieee80211_set_beacon_cntdwn(sdata, beacon); 4841 } 4842 4843 if (ifmsh->sync_ops) 4844 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4845 4846 skb = dev_alloc_skb(local->tx_headroom + 4847 beacon->head_len + 4848 256 + /* TIM IE */ 4849 beacon->tail_len + 4850 local->hw.extra_beacon_tailroom); 4851 if (!skb) 4852 goto out; 4853 skb_reserve(skb, local->tx_headroom); 4854 skb_put_data(skb, beacon->head, beacon->head_len); 4855 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4856 4857 if (offs) { 4858 offs->tim_offset = beacon->head_len; 4859 offs->tim_length = skb->len - beacon->head_len; 4860 } 4861 4862 skb_put_data(skb, beacon->tail, beacon->tail_len); 4863 } else { 4864 WARN_ON(1); 4865 goto out; 4866 } 4867 4868 /* CSA offsets */ 4869 if (offs && beacon) { 4870 int i; 4871 4872 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4873 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 4874 4875 if (!csa_off) 4876 continue; 4877 4878 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 4879 } 4880 } 4881 4882 band = chanctx_conf->def.chan->band; 4883 4884 info = IEEE80211_SKB_CB(skb); 4885 4886 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4887 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4888 info->band = band; 4889 4890 memset(&txrc, 0, sizeof(txrc)); 4891 txrc.hw = hw; 4892 txrc.sband = local->hw.wiphy->bands[band]; 4893 txrc.bss_conf = &sdata->vif.bss_conf; 4894 txrc.skb = skb; 4895 txrc.reported_rate.idx = -1; 4896 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4897 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4898 else 4899 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4900 txrc.bss = true; 4901 rate_control_get_rate(sdata, NULL, &txrc); 4902 4903 info->control.vif = vif; 4904 4905 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4906 IEEE80211_TX_CTL_ASSIGN_SEQ | 4907 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4908 out: 4909 rcu_read_unlock(); 4910 return skb; 4911 4912 } 4913 4914 struct sk_buff * 4915 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4916 struct ieee80211_vif *vif, 4917 struct ieee80211_mutable_offsets *offs) 4918 { 4919 return __ieee80211_beacon_get(hw, vif, offs, true); 4920 } 4921 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4922 4923 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4924 struct ieee80211_vif *vif, 4925 u16 *tim_offset, u16 *tim_length) 4926 { 4927 struct ieee80211_mutable_offsets offs = {}; 4928 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4929 struct sk_buff *copy; 4930 struct ieee80211_supported_band *sband; 4931 int shift; 4932 4933 if (!bcn) 4934 return bcn; 4935 4936 if (tim_offset) 4937 *tim_offset = offs.tim_offset; 4938 4939 if (tim_length) 4940 *tim_length = offs.tim_length; 4941 4942 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4943 !hw_to_local(hw)->monitors) 4944 return bcn; 4945 4946 /* send a copy to monitor interfaces */ 4947 copy = skb_copy(bcn, GFP_ATOMIC); 4948 if (!copy) 4949 return bcn; 4950 4951 shift = ieee80211_vif_get_shift(vif); 4952 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4953 if (!sband) 4954 return bcn; 4955 4956 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4957 NULL); 4958 4959 return bcn; 4960 } 4961 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4962 4963 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4964 struct ieee80211_vif *vif) 4965 { 4966 struct ieee80211_if_ap *ap = NULL; 4967 struct sk_buff *skb = NULL; 4968 struct probe_resp *presp = NULL; 4969 struct ieee80211_hdr *hdr; 4970 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4971 4972 if (sdata->vif.type != NL80211_IFTYPE_AP) 4973 return NULL; 4974 4975 rcu_read_lock(); 4976 4977 ap = &sdata->u.ap; 4978 presp = rcu_dereference(ap->probe_resp); 4979 if (!presp) 4980 goto out; 4981 4982 skb = dev_alloc_skb(presp->len); 4983 if (!skb) 4984 goto out; 4985 4986 skb_put_data(skb, presp->data, presp->len); 4987 4988 hdr = (struct ieee80211_hdr *) skb->data; 4989 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4990 4991 out: 4992 rcu_read_unlock(); 4993 return skb; 4994 } 4995 EXPORT_SYMBOL(ieee80211_proberesp_get); 4996 4997 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 4998 struct ieee80211_vif *vif) 4999 { 5000 struct sk_buff *skb = NULL; 5001 struct fils_discovery_data *tmpl = NULL; 5002 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5003 5004 if (sdata->vif.type != NL80211_IFTYPE_AP) 5005 return NULL; 5006 5007 rcu_read_lock(); 5008 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5009 if (!tmpl) { 5010 rcu_read_unlock(); 5011 return NULL; 5012 } 5013 5014 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5015 if (skb) { 5016 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5017 skb_put_data(skb, tmpl->data, tmpl->len); 5018 } 5019 5020 rcu_read_unlock(); 5021 return skb; 5022 } 5023 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5024 5025 struct sk_buff * 5026 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5027 struct ieee80211_vif *vif) 5028 { 5029 struct sk_buff *skb = NULL; 5030 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5031 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5032 5033 if (sdata->vif.type != NL80211_IFTYPE_AP) 5034 return NULL; 5035 5036 rcu_read_lock(); 5037 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5038 if (!tmpl) { 5039 rcu_read_unlock(); 5040 return NULL; 5041 } 5042 5043 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5044 if (skb) { 5045 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5046 skb_put_data(skb, tmpl->data, tmpl->len); 5047 } 5048 5049 rcu_read_unlock(); 5050 return skb; 5051 } 5052 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5053 5054 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5055 struct ieee80211_vif *vif) 5056 { 5057 struct ieee80211_sub_if_data *sdata; 5058 struct ieee80211_if_managed *ifmgd; 5059 struct ieee80211_pspoll *pspoll; 5060 struct ieee80211_local *local; 5061 struct sk_buff *skb; 5062 5063 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5064 return NULL; 5065 5066 sdata = vif_to_sdata(vif); 5067 ifmgd = &sdata->u.mgd; 5068 local = sdata->local; 5069 5070 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5071 if (!skb) 5072 return NULL; 5073 5074 skb_reserve(skb, local->hw.extra_tx_headroom); 5075 5076 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5077 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5078 IEEE80211_STYPE_PSPOLL); 5079 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5080 5081 /* aid in PS-Poll has its two MSBs each set to 1 */ 5082 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5083 5084 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5085 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5086 5087 return skb; 5088 } 5089 EXPORT_SYMBOL(ieee80211_pspoll_get); 5090 5091 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5092 struct ieee80211_vif *vif, 5093 bool qos_ok) 5094 { 5095 struct ieee80211_hdr_3addr *nullfunc; 5096 struct ieee80211_sub_if_data *sdata; 5097 struct ieee80211_if_managed *ifmgd; 5098 struct ieee80211_local *local; 5099 struct sk_buff *skb; 5100 bool qos = false; 5101 5102 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5103 return NULL; 5104 5105 sdata = vif_to_sdata(vif); 5106 ifmgd = &sdata->u.mgd; 5107 local = sdata->local; 5108 5109 if (qos_ok) { 5110 struct sta_info *sta; 5111 5112 rcu_read_lock(); 5113 sta = sta_info_get(sdata, ifmgd->bssid); 5114 qos = sta && sta->sta.wme; 5115 rcu_read_unlock(); 5116 } 5117 5118 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5119 sizeof(*nullfunc) + 2); 5120 if (!skb) 5121 return NULL; 5122 5123 skb_reserve(skb, local->hw.extra_tx_headroom); 5124 5125 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5126 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5127 IEEE80211_STYPE_NULLFUNC | 5128 IEEE80211_FCTL_TODS); 5129 if (qos) { 5130 __le16 qoshdr = cpu_to_le16(7); 5131 5132 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5133 IEEE80211_STYPE_NULLFUNC) != 5134 IEEE80211_STYPE_QOS_NULLFUNC); 5135 nullfunc->frame_control |= 5136 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5137 skb->priority = 7; 5138 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5139 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5140 } 5141 5142 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5143 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5144 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5145 5146 return skb; 5147 } 5148 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5149 5150 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5151 const u8 *src_addr, 5152 const u8 *ssid, size_t ssid_len, 5153 size_t tailroom) 5154 { 5155 struct ieee80211_local *local = hw_to_local(hw); 5156 struct ieee80211_hdr_3addr *hdr; 5157 struct sk_buff *skb; 5158 size_t ie_ssid_len; 5159 u8 *pos; 5160 5161 ie_ssid_len = 2 + ssid_len; 5162 5163 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5164 ie_ssid_len + tailroom); 5165 if (!skb) 5166 return NULL; 5167 5168 skb_reserve(skb, local->hw.extra_tx_headroom); 5169 5170 hdr = skb_put_zero(skb, sizeof(*hdr)); 5171 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5172 IEEE80211_STYPE_PROBE_REQ); 5173 eth_broadcast_addr(hdr->addr1); 5174 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5175 eth_broadcast_addr(hdr->addr3); 5176 5177 pos = skb_put(skb, ie_ssid_len); 5178 *pos++ = WLAN_EID_SSID; 5179 *pos++ = ssid_len; 5180 if (ssid_len) 5181 memcpy(pos, ssid, ssid_len); 5182 pos += ssid_len; 5183 5184 return skb; 5185 } 5186 EXPORT_SYMBOL(ieee80211_probereq_get); 5187 5188 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5189 const void *frame, size_t frame_len, 5190 const struct ieee80211_tx_info *frame_txctl, 5191 struct ieee80211_rts *rts) 5192 { 5193 const struct ieee80211_hdr *hdr = frame; 5194 5195 rts->frame_control = 5196 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5197 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5198 frame_txctl); 5199 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5200 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5201 } 5202 EXPORT_SYMBOL(ieee80211_rts_get); 5203 5204 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5205 const void *frame, size_t frame_len, 5206 const struct ieee80211_tx_info *frame_txctl, 5207 struct ieee80211_cts *cts) 5208 { 5209 const struct ieee80211_hdr *hdr = frame; 5210 5211 cts->frame_control = 5212 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5213 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5214 frame_len, frame_txctl); 5215 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5216 } 5217 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5218 5219 struct sk_buff * 5220 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5221 struct ieee80211_vif *vif) 5222 { 5223 struct ieee80211_local *local = hw_to_local(hw); 5224 struct sk_buff *skb = NULL; 5225 struct ieee80211_tx_data tx; 5226 struct ieee80211_sub_if_data *sdata; 5227 struct ps_data *ps; 5228 struct ieee80211_tx_info *info; 5229 struct ieee80211_chanctx_conf *chanctx_conf; 5230 5231 sdata = vif_to_sdata(vif); 5232 5233 rcu_read_lock(); 5234 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5235 5236 if (!chanctx_conf) 5237 goto out; 5238 5239 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5240 struct beacon_data *beacon = 5241 rcu_dereference(sdata->u.ap.beacon); 5242 5243 if (!beacon || !beacon->head) 5244 goto out; 5245 5246 ps = &sdata->u.ap.ps; 5247 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5248 ps = &sdata->u.mesh.ps; 5249 } else { 5250 goto out; 5251 } 5252 5253 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5254 goto out; /* send buffered bc/mc only after DTIM beacon */ 5255 5256 while (1) { 5257 skb = skb_dequeue(&ps->bc_buf); 5258 if (!skb) 5259 goto out; 5260 local->total_ps_buffered--; 5261 5262 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5263 struct ieee80211_hdr *hdr = 5264 (struct ieee80211_hdr *) skb->data; 5265 /* more buffered multicast/broadcast frames ==> set 5266 * MoreData flag in IEEE 802.11 header to inform PS 5267 * STAs */ 5268 hdr->frame_control |= 5269 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5270 } 5271 5272 if (sdata->vif.type == NL80211_IFTYPE_AP) 5273 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5274 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5275 break; 5276 ieee80211_free_txskb(hw, skb); 5277 } 5278 5279 info = IEEE80211_SKB_CB(skb); 5280 5281 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5282 info->band = chanctx_conf->def.chan->band; 5283 5284 if (invoke_tx_handlers(&tx)) 5285 skb = NULL; 5286 out: 5287 rcu_read_unlock(); 5288 5289 return skb; 5290 } 5291 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5292 5293 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5294 { 5295 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5296 struct ieee80211_sub_if_data *sdata = sta->sdata; 5297 struct ieee80211_local *local = sdata->local; 5298 int ret; 5299 u32 queues; 5300 5301 lockdep_assert_held(&local->sta_mtx); 5302 5303 /* only some cases are supported right now */ 5304 switch (sdata->vif.type) { 5305 case NL80211_IFTYPE_STATION: 5306 case NL80211_IFTYPE_AP: 5307 case NL80211_IFTYPE_AP_VLAN: 5308 break; 5309 default: 5310 WARN_ON(1); 5311 return -EINVAL; 5312 } 5313 5314 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5315 return -EINVAL; 5316 5317 if (sta->reserved_tid == tid) { 5318 ret = 0; 5319 goto out; 5320 } 5321 5322 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5323 sdata_err(sdata, "TID reservation already active\n"); 5324 ret = -EALREADY; 5325 goto out; 5326 } 5327 5328 ieee80211_stop_vif_queues(sdata->local, sdata, 5329 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5330 5331 synchronize_net(); 5332 5333 /* Tear down BA sessions so we stop aggregating on this TID */ 5334 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5335 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5336 __ieee80211_stop_tx_ba_session(sta, tid, 5337 AGG_STOP_LOCAL_REQUEST); 5338 } 5339 5340 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5341 __ieee80211_flush_queues(local, sdata, queues, false); 5342 5343 sta->reserved_tid = tid; 5344 5345 ieee80211_wake_vif_queues(local, sdata, 5346 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5347 5348 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5349 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5350 5351 ret = 0; 5352 out: 5353 return ret; 5354 } 5355 EXPORT_SYMBOL(ieee80211_reserve_tid); 5356 5357 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5358 { 5359 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5360 struct ieee80211_sub_if_data *sdata = sta->sdata; 5361 5362 lockdep_assert_held(&sdata->local->sta_mtx); 5363 5364 /* only some cases are supported right now */ 5365 switch (sdata->vif.type) { 5366 case NL80211_IFTYPE_STATION: 5367 case NL80211_IFTYPE_AP: 5368 case NL80211_IFTYPE_AP_VLAN: 5369 break; 5370 default: 5371 WARN_ON(1); 5372 return; 5373 } 5374 5375 if (tid != sta->reserved_tid) { 5376 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5377 return; 5378 } 5379 5380 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5381 } 5382 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5383 5384 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5385 struct sk_buff *skb, int tid, 5386 enum nl80211_band band) 5387 { 5388 int ac = ieee80211_ac_from_tid(tid); 5389 5390 skb_reset_mac_header(skb); 5391 skb_set_queue_mapping(skb, ac); 5392 skb->priority = tid; 5393 5394 skb->dev = sdata->dev; 5395 5396 /* 5397 * The other path calling ieee80211_xmit is from the tasklet, 5398 * and while we can handle concurrent transmissions locking 5399 * requirements are that we do not come into tx with bhs on. 5400 */ 5401 local_bh_disable(); 5402 IEEE80211_SKB_CB(skb)->band = band; 5403 ieee80211_xmit(sdata, NULL, skb); 5404 local_bh_enable(); 5405 } 5406 5407 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5408 const u8 *buf, size_t len, 5409 const u8 *dest, __be16 proto, bool unencrypted, 5410 u64 *cookie) 5411 { 5412 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5413 struct ieee80211_local *local = sdata->local; 5414 struct sta_info *sta; 5415 struct sk_buff *skb; 5416 struct ethhdr *ehdr; 5417 u32 ctrl_flags = 0; 5418 u32 flags = 0; 5419 5420 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5421 * or Pre-Authentication 5422 */ 5423 if (proto != sdata->control_port_protocol && 5424 proto != cpu_to_be16(ETH_P_PREAUTH)) 5425 return -EINVAL; 5426 5427 if (proto == sdata->control_port_protocol) 5428 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5429 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5430 5431 if (unencrypted) 5432 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5433 5434 if (cookie) 5435 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5436 5437 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5438 5439 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5440 sizeof(struct ethhdr) + len); 5441 if (!skb) 5442 return -ENOMEM; 5443 5444 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5445 5446 skb_put_data(skb, buf, len); 5447 5448 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5449 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5450 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5451 ehdr->h_proto = proto; 5452 5453 skb->dev = dev; 5454 skb->protocol = proto; 5455 skb_reset_network_header(skb); 5456 skb_reset_mac_header(skb); 5457 5458 /* update QoS header to prioritize control port frames if possible, 5459 * priorization also happens for control port frames send over 5460 * AF_PACKET 5461 */ 5462 rcu_read_lock(); 5463 5464 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5465 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5466 5467 skb_set_queue_mapping(skb, queue); 5468 skb_get_hash(skb); 5469 } 5470 5471 rcu_read_unlock(); 5472 5473 /* mutex lock is only needed for incrementing the cookie counter */ 5474 mutex_lock(&local->mtx); 5475 5476 local_bh_disable(); 5477 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5478 local_bh_enable(); 5479 5480 mutex_unlock(&local->mtx); 5481 5482 return 0; 5483 } 5484 5485 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5486 const u8 *buf, size_t len) 5487 { 5488 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5489 struct ieee80211_local *local = sdata->local; 5490 struct sk_buff *skb; 5491 5492 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5493 30 + /* header size */ 5494 18); /* 11s header size */ 5495 if (!skb) 5496 return -ENOMEM; 5497 5498 skb_reserve(skb, local->hw.extra_tx_headroom); 5499 skb_put_data(skb, buf, len); 5500 5501 skb->dev = dev; 5502 skb->protocol = htons(ETH_P_802_3); 5503 skb_reset_network_header(skb); 5504 skb_reset_mac_header(skb); 5505 5506 local_bh_disable(); 5507 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5508 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5509 NULL); 5510 local_bh_enable(); 5511 5512 return 0; 5513 } 5514