1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2021 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 42 struct sk_buff *skb, int group_addr, 43 int next_frag_len) 44 { 45 int rate, mrate, erp, dur, i, shift = 0; 46 struct ieee80211_rate *txrate; 47 struct ieee80211_local *local = tx->local; 48 struct ieee80211_supported_band *sband; 49 struct ieee80211_hdr *hdr; 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 51 struct ieee80211_chanctx_conf *chanctx_conf; 52 u32 rate_flags = 0; 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 rcu_read_lock(); 59 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 60 if (chanctx_conf) { 61 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 } 64 rcu_read_unlock(); 65 66 /* uh huh? */ 67 if (WARN_ON_ONCE(tx->rate.idx < 0)) 68 return 0; 69 70 sband = local->hw.wiphy->bands[info->band]; 71 txrate = &sband->bitrates[tx->rate.idx]; 72 73 erp = txrate->flags & IEEE80211_RATE_ERP_G; 74 75 /* device is expected to do this */ 76 if (sband->band == NL80211_BAND_S1GHZ) 77 return 0; 78 79 /* 80 * data and mgmt (except PS Poll): 81 * - during CFP: 32768 82 * - during contention period: 83 * if addr1 is group address: 0 84 * if more fragments = 0 and addr1 is individual address: time to 85 * transmit one ACK plus SIFS 86 * if more fragments = 1 and addr1 is individual address: time to 87 * transmit next fragment plus 2 x ACK plus 3 x SIFS 88 * 89 * IEEE 802.11, 9.6: 90 * - control response frame (CTS or ACK) shall be transmitted using the 91 * same rate as the immediately previous frame in the frame exchange 92 * sequence, if this rate belongs to the PHY mandatory rates, or else 93 * at the highest possible rate belonging to the PHY rates in the 94 * BSSBasicRateSet 95 */ 96 hdr = (struct ieee80211_hdr *)skb->data; 97 if (ieee80211_is_ctl(hdr->frame_control)) { 98 /* TODO: These control frames are not currently sent by 99 * mac80211, but should they be implemented, this function 100 * needs to be updated to support duration field calculation. 101 * 102 * RTS: time needed to transmit pending data/mgmt frame plus 103 * one CTS frame plus one ACK frame plus 3 x SIFS 104 * CTS: duration of immediately previous RTS minus time 105 * required to transmit CTS and its SIFS 106 * ACK: 0 if immediately previous directed data/mgmt had 107 * more=0, with more=1 duration in ACK frame is duration 108 * from previous frame minus time needed to transmit ACK 109 * and its SIFS 110 * PS Poll: BIT(15) | BIT(14) | aid 111 */ 112 return 0; 113 } 114 115 /* data/mgmt */ 116 if (0 /* FIX: data/mgmt during CFP */) 117 return cpu_to_le16(32768); 118 119 if (group_addr) /* Group address as the destination - no ACK */ 120 return 0; 121 122 /* Individual destination address: 123 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 124 * CTS and ACK frames shall be transmitted using the highest rate in 125 * basic rate set that is less than or equal to the rate of the 126 * immediately previous frame and that is using the same modulation 127 * (CCK or OFDM). If no basic rate set matches with these requirements, 128 * the highest mandatory rate of the PHY that is less than or equal to 129 * the rate of the previous frame is used. 130 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 131 */ 132 rate = -1; 133 /* use lowest available if everything fails */ 134 mrate = sband->bitrates[0].bitrate; 135 for (i = 0; i < sband->n_bitrates; i++) { 136 struct ieee80211_rate *r = &sband->bitrates[i]; 137 138 if (r->bitrate > txrate->bitrate) 139 break; 140 141 if ((rate_flags & r->flags) != rate_flags) 142 continue; 143 144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 145 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 146 147 switch (sband->band) { 148 case NL80211_BAND_2GHZ: { 149 u32 flag; 150 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 151 flag = IEEE80211_RATE_MANDATORY_G; 152 else 153 flag = IEEE80211_RATE_MANDATORY_B; 154 if (r->flags & flag) 155 mrate = r->bitrate; 156 break; 157 } 158 case NL80211_BAND_5GHZ: 159 case NL80211_BAND_6GHZ: 160 if (r->flags & IEEE80211_RATE_MANDATORY_A) 161 mrate = r->bitrate; 162 break; 163 case NL80211_BAND_S1GHZ: 164 case NL80211_BAND_60GHZ: 165 /* TODO, for now fall through */ 166 case NUM_NL80211_BANDS: 167 WARN_ON(1); 168 break; 169 } 170 } 171 if (rate == -1) { 172 /* No matching basic rate found; use highest suitable mandatory 173 * PHY rate */ 174 rate = DIV_ROUND_UP(mrate, 1 << shift); 175 } 176 177 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 178 if (ieee80211_is_data_qos(hdr->frame_control) && 179 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 180 dur = 0; 181 else 182 /* Time needed to transmit ACK 183 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 184 * to closest integer */ 185 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 186 tx->sdata->vif.bss_conf.use_short_preamble, 187 shift); 188 189 if (next_frag_len) { 190 /* Frame is fragmented: duration increases with time needed to 191 * transmit next fragment plus ACK and 2 x SIFS. */ 192 dur *= 2; /* ACK + SIFS */ 193 /* next fragment */ 194 dur += ieee80211_frame_duration(sband->band, next_frag_len, 195 txrate->bitrate, erp, 196 tx->sdata->vif.bss_conf.use_short_preamble, 197 shift); 198 } 199 200 return cpu_to_le16(dur); 201 } 202 203 /* tx handlers */ 204 static ieee80211_tx_result debug_noinline 205 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 206 { 207 struct ieee80211_local *local = tx->local; 208 struct ieee80211_if_managed *ifmgd; 209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 210 211 /* driver doesn't support power save */ 212 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 213 return TX_CONTINUE; 214 215 /* hardware does dynamic power save */ 216 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 217 return TX_CONTINUE; 218 219 /* dynamic power save disabled */ 220 if (local->hw.conf.dynamic_ps_timeout <= 0) 221 return TX_CONTINUE; 222 223 /* we are scanning, don't enable power save */ 224 if (local->scanning) 225 return TX_CONTINUE; 226 227 if (!local->ps_sdata) 228 return TX_CONTINUE; 229 230 /* No point if we're going to suspend */ 231 if (local->quiescing) 232 return TX_CONTINUE; 233 234 /* dynamic ps is supported only in managed mode */ 235 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 236 return TX_CONTINUE; 237 238 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 239 return TX_CONTINUE; 240 241 ifmgd = &tx->sdata->u.mgd; 242 243 /* 244 * Don't wakeup from power save if u-apsd is enabled, voip ac has 245 * u-apsd enabled and the frame is in voip class. This effectively 246 * means that even if all access categories have u-apsd enabled, in 247 * practise u-apsd is only used with the voip ac. This is a 248 * workaround for the case when received voip class packets do not 249 * have correct qos tag for some reason, due the network or the 250 * peer application. 251 * 252 * Note: ifmgd->uapsd_queues access is racy here. If the value is 253 * changed via debugfs, user needs to reassociate manually to have 254 * everything in sync. 255 */ 256 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 257 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 258 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 259 return TX_CONTINUE; 260 261 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 262 ieee80211_stop_queues_by_reason(&local->hw, 263 IEEE80211_MAX_QUEUE_MAP, 264 IEEE80211_QUEUE_STOP_REASON_PS, 265 false); 266 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 267 ieee80211_queue_work(&local->hw, 268 &local->dynamic_ps_disable_work); 269 } 270 271 /* Don't restart the timer if we're not disassociated */ 272 if (!ifmgd->associated) 273 return TX_CONTINUE; 274 275 mod_timer(&local->dynamic_ps_timer, jiffies + 276 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 277 278 return TX_CONTINUE; 279 } 280 281 static ieee80211_tx_result debug_noinline 282 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 283 { 284 285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 286 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 287 bool assoc = false; 288 289 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 290 return TX_CONTINUE; 291 292 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 293 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 294 !ieee80211_is_probe_req(hdr->frame_control) && 295 !ieee80211_is_any_nullfunc(hdr->frame_control)) 296 /* 297 * When software scanning only nullfunc frames (to notify 298 * the sleep state to the AP) and probe requests (for the 299 * active scan) are allowed, all other frames should not be 300 * sent and we should not get here, but if we do 301 * nonetheless, drop them to avoid sending them 302 * off-channel. See the link below and 303 * ieee80211_start_scan() for more. 304 * 305 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 306 */ 307 return TX_DROP; 308 309 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 310 return TX_CONTINUE; 311 312 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 313 return TX_CONTINUE; 314 315 if (tx->sta) 316 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 317 318 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 319 if (unlikely(!assoc && 320 ieee80211_is_data(hdr->frame_control))) { 321 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 322 sdata_info(tx->sdata, 323 "dropped data frame to not associated station %pM\n", 324 hdr->addr1); 325 #endif 326 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 327 return TX_DROP; 328 } 329 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 330 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 331 /* 332 * No associated STAs - no need to send multicast 333 * frames. 334 */ 335 return TX_DROP; 336 } 337 338 return TX_CONTINUE; 339 } 340 341 /* This function is called whenever the AP is about to exceed the maximum limit 342 * of buffered frames for power saving STAs. This situation should not really 343 * happen often during normal operation, so dropping the oldest buffered packet 344 * from each queue should be OK to make some room for new frames. */ 345 static void purge_old_ps_buffers(struct ieee80211_local *local) 346 { 347 int total = 0, purged = 0; 348 struct sk_buff *skb; 349 struct ieee80211_sub_if_data *sdata; 350 struct sta_info *sta; 351 352 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 353 struct ps_data *ps; 354 355 if (sdata->vif.type == NL80211_IFTYPE_AP) 356 ps = &sdata->u.ap.ps; 357 else if (ieee80211_vif_is_mesh(&sdata->vif)) 358 ps = &sdata->u.mesh.ps; 359 else 360 continue; 361 362 skb = skb_dequeue(&ps->bc_buf); 363 if (skb) { 364 purged++; 365 ieee80211_free_txskb(&local->hw, skb); 366 } 367 total += skb_queue_len(&ps->bc_buf); 368 } 369 370 /* 371 * Drop one frame from each station from the lowest-priority 372 * AC that has frames at all. 373 */ 374 list_for_each_entry_rcu(sta, &local->sta_list, list) { 375 int ac; 376 377 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 378 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 379 total += skb_queue_len(&sta->ps_tx_buf[ac]); 380 if (skb) { 381 purged++; 382 ieee80211_free_txskb(&local->hw, skb); 383 break; 384 } 385 } 386 } 387 388 local->total_ps_buffered = total; 389 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 390 } 391 392 static ieee80211_tx_result 393 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 394 { 395 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 396 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 397 struct ps_data *ps; 398 399 /* 400 * broadcast/multicast frame 401 * 402 * If any of the associated/peer stations is in power save mode, 403 * the frame is buffered to be sent after DTIM beacon frame. 404 * This is done either by the hardware or us. 405 */ 406 407 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 408 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 409 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 410 if (!tx->sdata->bss) 411 return TX_CONTINUE; 412 413 ps = &tx->sdata->bss->ps; 414 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 415 ps = &tx->sdata->u.mesh.ps; 416 } else { 417 return TX_CONTINUE; 418 } 419 420 421 /* no buffering for ordered frames */ 422 if (ieee80211_has_order(hdr->frame_control)) 423 return TX_CONTINUE; 424 425 if (ieee80211_is_probe_req(hdr->frame_control)) 426 return TX_CONTINUE; 427 428 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 429 info->hw_queue = tx->sdata->vif.cab_queue; 430 431 /* no stations in PS mode and no buffered packets */ 432 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 433 return TX_CONTINUE; 434 435 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 436 437 /* device releases frame after DTIM beacon */ 438 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 439 return TX_CONTINUE; 440 441 /* buffered in mac80211 */ 442 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 443 purge_old_ps_buffers(tx->local); 444 445 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 446 ps_dbg(tx->sdata, 447 "BC TX buffer full - dropping the oldest frame\n"); 448 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 449 } else 450 tx->local->total_ps_buffered++; 451 452 skb_queue_tail(&ps->bc_buf, tx->skb); 453 454 return TX_QUEUED; 455 } 456 457 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 458 struct sk_buff *skb) 459 { 460 if (!ieee80211_is_mgmt(fc)) 461 return 0; 462 463 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 464 return 0; 465 466 if (!ieee80211_is_robust_mgmt_frame(skb)) 467 return 0; 468 469 return 1; 470 } 471 472 static ieee80211_tx_result 473 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 474 { 475 struct sta_info *sta = tx->sta; 476 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 477 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 478 struct ieee80211_local *local = tx->local; 479 480 if (unlikely(!sta)) 481 return TX_CONTINUE; 482 483 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 484 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 485 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 486 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 487 int ac = skb_get_queue_mapping(tx->skb); 488 489 if (ieee80211_is_mgmt(hdr->frame_control) && 490 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 491 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 492 return TX_CONTINUE; 493 } 494 495 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 496 sta->sta.addr, sta->sta.aid, ac); 497 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 498 purge_old_ps_buffers(tx->local); 499 500 /* sync with ieee80211_sta_ps_deliver_wakeup */ 501 spin_lock(&sta->ps_lock); 502 /* 503 * STA woke up the meantime and all the frames on ps_tx_buf have 504 * been queued to pending queue. No reordering can happen, go 505 * ahead and Tx the packet. 506 */ 507 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 508 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 509 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 510 spin_unlock(&sta->ps_lock); 511 return TX_CONTINUE; 512 } 513 514 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 515 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 516 ps_dbg(tx->sdata, 517 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 518 sta->sta.addr, ac); 519 ieee80211_free_txskb(&local->hw, old); 520 } else 521 tx->local->total_ps_buffered++; 522 523 info->control.jiffies = jiffies; 524 info->control.vif = &tx->sdata->vif; 525 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 526 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 527 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 528 spin_unlock(&sta->ps_lock); 529 530 if (!timer_pending(&local->sta_cleanup)) 531 mod_timer(&local->sta_cleanup, 532 round_jiffies(jiffies + 533 STA_INFO_CLEANUP_INTERVAL)); 534 535 /* 536 * We queued up some frames, so the TIM bit might 537 * need to be set, recalculate it. 538 */ 539 sta_info_recalc_tim(sta); 540 541 return TX_QUEUED; 542 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 543 ps_dbg(tx->sdata, 544 "STA %pM in PS mode, but polling/in SP -> send frame\n", 545 sta->sta.addr); 546 } 547 548 return TX_CONTINUE; 549 } 550 551 static ieee80211_tx_result debug_noinline 552 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 553 { 554 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 555 return TX_CONTINUE; 556 557 if (tx->flags & IEEE80211_TX_UNICAST) 558 return ieee80211_tx_h_unicast_ps_buf(tx); 559 else 560 return ieee80211_tx_h_multicast_ps_buf(tx); 561 } 562 563 static ieee80211_tx_result debug_noinline 564 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 565 { 566 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 567 568 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 569 if (tx->sdata->control_port_no_encrypt) 570 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 571 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 572 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 573 } 574 575 return TX_CONTINUE; 576 } 577 578 static ieee80211_tx_result debug_noinline 579 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 580 { 581 struct ieee80211_key *key; 582 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 583 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 584 585 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 586 tx->key = NULL; 587 return TX_CONTINUE; 588 } 589 590 if (tx->sta && 591 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 592 tx->key = key; 593 else if (ieee80211_is_group_privacy_action(tx->skb) && 594 (key = rcu_dereference(tx->sdata->default_multicast_key))) 595 tx->key = key; 596 else if (ieee80211_is_mgmt(hdr->frame_control) && 597 is_multicast_ether_addr(hdr->addr1) && 598 ieee80211_is_robust_mgmt_frame(tx->skb) && 599 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 600 tx->key = key; 601 else if (is_multicast_ether_addr(hdr->addr1) && 602 (key = rcu_dereference(tx->sdata->default_multicast_key))) 603 tx->key = key; 604 else if (!is_multicast_ether_addr(hdr->addr1) && 605 (key = rcu_dereference(tx->sdata->default_unicast_key))) 606 tx->key = key; 607 else 608 tx->key = NULL; 609 610 if (tx->key) { 611 bool skip_hw = false; 612 613 /* TODO: add threshold stuff again */ 614 615 switch (tx->key->conf.cipher) { 616 case WLAN_CIPHER_SUITE_WEP40: 617 case WLAN_CIPHER_SUITE_WEP104: 618 case WLAN_CIPHER_SUITE_TKIP: 619 if (!ieee80211_is_data_present(hdr->frame_control)) 620 tx->key = NULL; 621 break; 622 case WLAN_CIPHER_SUITE_CCMP: 623 case WLAN_CIPHER_SUITE_CCMP_256: 624 case WLAN_CIPHER_SUITE_GCMP: 625 case WLAN_CIPHER_SUITE_GCMP_256: 626 if (!ieee80211_is_data_present(hdr->frame_control) && 627 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 628 tx->skb) && 629 !ieee80211_is_group_privacy_action(tx->skb)) 630 tx->key = NULL; 631 else 632 skip_hw = (tx->key->conf.flags & 633 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 634 ieee80211_is_mgmt(hdr->frame_control); 635 break; 636 case WLAN_CIPHER_SUITE_AES_CMAC: 637 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 638 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 640 if (!ieee80211_is_mgmt(hdr->frame_control)) 641 tx->key = NULL; 642 break; 643 } 644 645 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 646 !ieee80211_is_deauth(hdr->frame_control))) 647 return TX_DROP; 648 649 if (!skip_hw && tx->key && 650 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 651 info->control.hw_key = &tx->key->conf; 652 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 653 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 654 return TX_DROP; 655 } 656 657 return TX_CONTINUE; 658 } 659 660 static ieee80211_tx_result debug_noinline 661 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 662 { 663 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 664 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 665 struct ieee80211_supported_band *sband; 666 u32 len; 667 struct ieee80211_tx_rate_control txrc; 668 struct ieee80211_sta_rates *ratetbl = NULL; 669 bool assoc = false; 670 671 memset(&txrc, 0, sizeof(txrc)); 672 673 sband = tx->local->hw.wiphy->bands[info->band]; 674 675 len = min_t(u32, tx->skb->len + FCS_LEN, 676 tx->local->hw.wiphy->frag_threshold); 677 678 /* set up the tx rate control struct we give the RC algo */ 679 txrc.hw = &tx->local->hw; 680 txrc.sband = sband; 681 txrc.bss_conf = &tx->sdata->vif.bss_conf; 682 txrc.skb = tx->skb; 683 txrc.reported_rate.idx = -1; 684 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 685 686 if (tx->sdata->rc_has_mcs_mask[info->band]) 687 txrc.rate_idx_mcs_mask = 688 tx->sdata->rc_rateidx_mcs_mask[info->band]; 689 690 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 691 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 692 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 693 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 694 695 /* set up RTS protection if desired */ 696 if (len > tx->local->hw.wiphy->rts_threshold) { 697 txrc.rts = true; 698 } 699 700 info->control.use_rts = txrc.rts; 701 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 702 703 /* 704 * Use short preamble if the BSS can handle it, but not for 705 * management frames unless we know the receiver can handle 706 * that -- the management frame might be to a station that 707 * just wants a probe response. 708 */ 709 if (tx->sdata->vif.bss_conf.use_short_preamble && 710 (ieee80211_is_data(hdr->frame_control) || 711 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 712 txrc.short_preamble = true; 713 714 info->control.short_preamble = txrc.short_preamble; 715 716 /* don't ask rate control when rate already injected via radiotap */ 717 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 718 return TX_CONTINUE; 719 720 if (tx->sta) 721 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 722 723 /* 724 * Lets not bother rate control if we're associated and cannot 725 * talk to the sta. This should not happen. 726 */ 727 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 728 !rate_usable_index_exists(sband, &tx->sta->sta), 729 "%s: Dropped data frame as no usable bitrate found while " 730 "scanning and associated. Target station: " 731 "%pM on %d GHz band\n", 732 tx->sdata->name, hdr->addr1, 733 info->band ? 5 : 2)) 734 return TX_DROP; 735 736 /* 737 * If we're associated with the sta at this point we know we can at 738 * least send the frame at the lowest bit rate. 739 */ 740 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 741 742 if (tx->sta && !info->control.skip_table) 743 ratetbl = rcu_dereference(tx->sta->sta.rates); 744 745 if (unlikely(info->control.rates[0].idx < 0)) { 746 if (ratetbl) { 747 struct ieee80211_tx_rate rate = { 748 .idx = ratetbl->rate[0].idx, 749 .flags = ratetbl->rate[0].flags, 750 .count = ratetbl->rate[0].count 751 }; 752 753 if (ratetbl->rate[0].idx < 0) 754 return TX_DROP; 755 756 tx->rate = rate; 757 } else { 758 return TX_DROP; 759 } 760 } else { 761 tx->rate = info->control.rates[0]; 762 } 763 764 if (txrc.reported_rate.idx < 0) { 765 txrc.reported_rate = tx->rate; 766 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 767 tx->sta->tx_stats.last_rate = txrc.reported_rate; 768 } else if (tx->sta) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 771 if (ratetbl) 772 return TX_CONTINUE; 773 774 if (unlikely(!info->control.rates[0].count)) 775 info->control.rates[0].count = 1; 776 777 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 778 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 779 info->control.rates[0].count = 1; 780 781 return TX_CONTINUE; 782 } 783 784 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 785 { 786 u16 *seq = &sta->tid_seq[tid]; 787 __le16 ret = cpu_to_le16(*seq); 788 789 /* Increase the sequence number. */ 790 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 791 792 return ret; 793 } 794 795 static ieee80211_tx_result debug_noinline 796 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 797 { 798 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 799 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 800 int tid; 801 802 /* 803 * Packet injection may want to control the sequence 804 * number, if we have no matching interface then we 805 * neither assign one ourselves nor ask the driver to. 806 */ 807 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 808 return TX_CONTINUE; 809 810 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 811 return TX_CONTINUE; 812 813 if (ieee80211_hdrlen(hdr->frame_control) < 24) 814 return TX_CONTINUE; 815 816 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 817 return TX_CONTINUE; 818 819 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 820 return TX_CONTINUE; 821 822 /* 823 * Anything but QoS data that has a sequence number field 824 * (is long enough) gets a sequence number from the global 825 * counter. QoS data frames with a multicast destination 826 * also use the global counter (802.11-2012 9.3.2.10). 827 */ 828 if (!ieee80211_is_data_qos(hdr->frame_control) || 829 is_multicast_ether_addr(hdr->addr1)) { 830 /* driver should assign sequence number */ 831 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 832 /* for pure STA mode without beacons, we can do it */ 833 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 834 tx->sdata->sequence_number += 0x10; 835 if (tx->sta) 836 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 837 return TX_CONTINUE; 838 } 839 840 /* 841 * This should be true for injected/management frames only, for 842 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 843 * above since they are not QoS-data frames. 844 */ 845 if (!tx->sta) 846 return TX_CONTINUE; 847 848 /* include per-STA, per-TID sequence counter */ 849 tid = ieee80211_get_tid(hdr); 850 tx->sta->tx_stats.msdu[tid]++; 851 852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 853 854 return TX_CONTINUE; 855 } 856 857 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 858 struct sk_buff *skb, int hdrlen, 859 int frag_threshold) 860 { 861 struct ieee80211_local *local = tx->local; 862 struct ieee80211_tx_info *info; 863 struct sk_buff *tmp; 864 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 865 int pos = hdrlen + per_fragm; 866 int rem = skb->len - hdrlen - per_fragm; 867 868 if (WARN_ON(rem < 0)) 869 return -EINVAL; 870 871 /* first fragment was already added to queue by caller */ 872 873 while (rem) { 874 int fraglen = per_fragm; 875 876 if (fraglen > rem) 877 fraglen = rem; 878 rem -= fraglen; 879 tmp = dev_alloc_skb(local->tx_headroom + 880 frag_threshold + 881 tx->sdata->encrypt_headroom + 882 IEEE80211_ENCRYPT_TAILROOM); 883 if (!tmp) 884 return -ENOMEM; 885 886 __skb_queue_tail(&tx->skbs, tmp); 887 888 skb_reserve(tmp, 889 local->tx_headroom + tx->sdata->encrypt_headroom); 890 891 /* copy control information */ 892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 893 894 info = IEEE80211_SKB_CB(tmp); 895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 896 IEEE80211_TX_CTL_FIRST_FRAGMENT); 897 898 if (rem) 899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 900 901 skb_copy_queue_mapping(tmp, skb); 902 tmp->priority = skb->priority; 903 tmp->dev = skb->dev; 904 905 /* copy header and data */ 906 skb_put_data(tmp, skb->data, hdrlen); 907 skb_put_data(tmp, skb->data + pos, fraglen); 908 909 pos += fraglen; 910 } 911 912 /* adjust first fragment's length */ 913 skb_trim(skb, hdrlen + per_fragm); 914 return 0; 915 } 916 917 static ieee80211_tx_result debug_noinline 918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 919 { 920 struct sk_buff *skb = tx->skb; 921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 922 struct ieee80211_hdr *hdr = (void *)skb->data; 923 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 924 int hdrlen; 925 int fragnum; 926 927 /* no matter what happens, tx->skb moves to tx->skbs */ 928 __skb_queue_tail(&tx->skbs, skb); 929 tx->skb = NULL; 930 931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 932 return TX_CONTINUE; 933 934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 935 return TX_CONTINUE; 936 937 /* 938 * Warn when submitting a fragmented A-MPDU frame and drop it. 939 * This scenario is handled in ieee80211_tx_prepare but extra 940 * caution taken here as fragmented ampdu may cause Tx stop. 941 */ 942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 943 return TX_DROP; 944 945 hdrlen = ieee80211_hdrlen(hdr->frame_control); 946 947 /* internal error, why isn't DONTFRAG set? */ 948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 949 return TX_DROP; 950 951 /* 952 * Now fragment the frame. This will allocate all the fragments and 953 * chain them (using skb as the first fragment) to skb->next. 954 * During transmission, we will remove the successfully transmitted 955 * fragments from this list. When the low-level driver rejects one 956 * of the fragments then we will simply pretend to accept the skb 957 * but store it away as pending. 958 */ 959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 960 return TX_DROP; 961 962 /* update duration/seq/flags of fragments */ 963 fragnum = 0; 964 965 skb_queue_walk(&tx->skbs, skb) { 966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 967 968 hdr = (void *)skb->data; 969 info = IEEE80211_SKB_CB(skb); 970 971 if (!skb_queue_is_last(&tx->skbs, skb)) { 972 hdr->frame_control |= morefrags; 973 /* 974 * No multi-rate retries for fragmented frames, that 975 * would completely throw off the NAV at other STAs. 976 */ 977 info->control.rates[1].idx = -1; 978 info->control.rates[2].idx = -1; 979 info->control.rates[3].idx = -1; 980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 982 } else { 983 hdr->frame_control &= ~morefrags; 984 } 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 986 fragnum++; 987 } 988 989 return TX_CONTINUE; 990 } 991 992 static ieee80211_tx_result debug_noinline 993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 994 { 995 struct sk_buff *skb; 996 int ac = -1; 997 998 if (!tx->sta) 999 return TX_CONTINUE; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 ac = skb_get_queue_mapping(skb); 1003 tx->sta->tx_stats.bytes[ac] += skb->len; 1004 } 1005 if (ac >= 0) 1006 tx->sta->tx_stats.packets[ac]++; 1007 1008 return TX_CONTINUE; 1009 } 1010 1011 static ieee80211_tx_result debug_noinline 1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1013 { 1014 if (!tx->key) 1015 return TX_CONTINUE; 1016 1017 switch (tx->key->conf.cipher) { 1018 case WLAN_CIPHER_SUITE_WEP40: 1019 case WLAN_CIPHER_SUITE_WEP104: 1020 return ieee80211_crypto_wep_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_TKIP: 1022 return ieee80211_crypto_tkip_encrypt(tx); 1023 case WLAN_CIPHER_SUITE_CCMP: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_CCMP_256: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_256_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_AES_CMAC: 1030 return ieee80211_crypto_aes_cmac_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1035 return ieee80211_crypto_aes_gmac_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_GCMP: 1037 case WLAN_CIPHER_SUITE_GCMP_256: 1038 return ieee80211_crypto_gcmp_encrypt(tx); 1039 default: 1040 return ieee80211_crypto_hw_encrypt(tx); 1041 } 1042 1043 return TX_DROP; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1048 { 1049 struct sk_buff *skb; 1050 struct ieee80211_hdr *hdr; 1051 int next_len; 1052 bool group_addr; 1053 1054 skb_queue_walk(&tx->skbs, skb) { 1055 hdr = (void *) skb->data; 1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1057 break; /* must not overwrite AID */ 1058 if (!skb_queue_is_last(&tx->skbs, skb)) { 1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1060 next_len = next->len; 1061 } else 1062 next_len = 0; 1063 group_addr = is_multicast_ether_addr(hdr->addr1); 1064 1065 hdr->duration_id = 1066 ieee80211_duration(tx, skb, group_addr, next_len); 1067 } 1068 1069 return TX_CONTINUE; 1070 } 1071 1072 /* actual transmit path */ 1073 1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1075 struct sk_buff *skb, 1076 struct ieee80211_tx_info *info, 1077 struct tid_ampdu_tx *tid_tx, 1078 int tid) 1079 { 1080 bool queued = false; 1081 bool reset_agg_timer = false; 1082 struct sk_buff *purge_skb = NULL; 1083 1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1085 info->flags |= IEEE80211_TX_CTL_AMPDU; 1086 reset_agg_timer = true; 1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1088 /* 1089 * nothing -- this aggregation session is being started 1090 * but that might still fail with the driver 1091 */ 1092 } else if (!tx->sta->sta.txq[tid]) { 1093 spin_lock(&tx->sta->lock); 1094 /* 1095 * Need to re-check now, because we may get here 1096 * 1097 * 1) in the window during which the setup is actually 1098 * already done, but not marked yet because not all 1099 * packets are spliced over to the driver pending 1100 * queue yet -- if this happened we acquire the lock 1101 * either before or after the splice happens, but 1102 * need to recheck which of these cases happened. 1103 * 1104 * 2) during session teardown, if the OPERATIONAL bit 1105 * was cleared due to the teardown but the pointer 1106 * hasn't been assigned NULL yet (or we loaded it 1107 * before it was assigned) -- in this case it may 1108 * now be NULL which means we should just let the 1109 * packet pass through because splicing the frames 1110 * back is already done. 1111 */ 1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1113 1114 if (!tid_tx) { 1115 /* do nothing, let packet pass through */ 1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1117 info->flags |= IEEE80211_TX_CTL_AMPDU; 1118 reset_agg_timer = true; 1119 } else { 1120 queued = true; 1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1122 clear_sta_flag(tx->sta, WLAN_STA_SP); 1123 ps_dbg(tx->sta->sdata, 1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1125 tx->sta->sta.addr, tx->sta->sta.aid); 1126 } 1127 info->control.vif = &tx->sdata->vif; 1128 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1130 __skb_queue_tail(&tid_tx->pending, skb); 1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1132 purge_skb = __skb_dequeue(&tid_tx->pending); 1133 } 1134 spin_unlock(&tx->sta->lock); 1135 1136 if (purge_skb) 1137 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1138 } 1139 1140 /* reset session timer */ 1141 if (reset_agg_timer) 1142 tid_tx->last_tx = jiffies; 1143 1144 return queued; 1145 } 1146 1147 /* 1148 * initialises @tx 1149 * pass %NULL for the station if unknown, a valid pointer if known 1150 * or an ERR_PTR() if the station is known not to exist 1151 */ 1152 static ieee80211_tx_result 1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1154 struct ieee80211_tx_data *tx, 1155 struct sta_info *sta, struct sk_buff *skb) 1156 { 1157 struct ieee80211_local *local = sdata->local; 1158 struct ieee80211_hdr *hdr; 1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1160 int tid; 1161 1162 memset(tx, 0, sizeof(*tx)); 1163 tx->skb = skb; 1164 tx->local = local; 1165 tx->sdata = sdata; 1166 __skb_queue_head_init(&tx->skbs); 1167 1168 /* 1169 * If this flag is set to true anywhere, and we get here, 1170 * we are doing the needed processing, so remove the flag 1171 * now. 1172 */ 1173 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1174 1175 hdr = (struct ieee80211_hdr *) skb->data; 1176 1177 if (likely(sta)) { 1178 if (!IS_ERR(sta)) 1179 tx->sta = sta; 1180 } else { 1181 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1182 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1183 if (!tx->sta && sdata->wdev.use_4addr) 1184 return TX_DROP; 1185 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1186 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1187 } 1188 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1189 tx->sta = sta_info_get(sdata, hdr->addr1); 1190 } 1191 1192 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1193 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1194 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1195 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1196 struct tid_ampdu_tx *tid_tx; 1197 1198 tid = ieee80211_get_tid(hdr); 1199 1200 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1201 if (tid_tx) { 1202 bool queued; 1203 1204 queued = ieee80211_tx_prep_agg(tx, skb, info, 1205 tid_tx, tid); 1206 1207 if (unlikely(queued)) 1208 return TX_QUEUED; 1209 } 1210 } 1211 1212 if (is_multicast_ether_addr(hdr->addr1)) { 1213 tx->flags &= ~IEEE80211_TX_UNICAST; 1214 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1215 } else 1216 tx->flags |= IEEE80211_TX_UNICAST; 1217 1218 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1219 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1220 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1221 info->flags & IEEE80211_TX_CTL_AMPDU) 1222 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1223 } 1224 1225 if (!tx->sta) 1226 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1227 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1229 ieee80211_check_fast_xmit(tx->sta); 1230 } 1231 1232 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1233 1234 return TX_CONTINUE; 1235 } 1236 1237 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1238 struct ieee80211_vif *vif, 1239 struct sta_info *sta, 1240 struct sk_buff *skb) 1241 { 1242 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1243 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1244 struct ieee80211_txq *txq = NULL; 1245 1246 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1247 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1248 return NULL; 1249 1250 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1251 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1252 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1253 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1254 vif->type == NL80211_IFTYPE_STATION) && 1255 sta && sta->uploaded) { 1256 /* 1257 * This will be NULL if the driver didn't set the 1258 * opt-in hardware flag. 1259 */ 1260 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1261 } 1262 } else if (sta) { 1263 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1264 1265 if (!sta->uploaded) 1266 return NULL; 1267 1268 txq = sta->sta.txq[tid]; 1269 } else if (vif) { 1270 txq = vif->txq; 1271 } 1272 1273 if (!txq) 1274 return NULL; 1275 1276 return to_txq_info(txq); 1277 } 1278 1279 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1280 { 1281 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1282 } 1283 1284 static u32 codel_skb_len_func(const struct sk_buff *skb) 1285 { 1286 return skb->len; 1287 } 1288 1289 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1290 { 1291 const struct ieee80211_tx_info *info; 1292 1293 info = (const struct ieee80211_tx_info *)skb->cb; 1294 return info->control.enqueue_time; 1295 } 1296 1297 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1298 void *ctx) 1299 { 1300 struct ieee80211_local *local; 1301 struct txq_info *txqi; 1302 struct fq *fq; 1303 struct fq_flow *flow; 1304 1305 txqi = ctx; 1306 local = vif_to_sdata(txqi->txq.vif)->local; 1307 fq = &local->fq; 1308 1309 if (cvars == &txqi->def_cvars) 1310 flow = &txqi->tin.default_flow; 1311 else 1312 flow = &fq->flows[cvars - local->cvars]; 1313 1314 return fq_flow_dequeue(fq, flow); 1315 } 1316 1317 static void codel_drop_func(struct sk_buff *skb, 1318 void *ctx) 1319 { 1320 struct ieee80211_local *local; 1321 struct ieee80211_hw *hw; 1322 struct txq_info *txqi; 1323 1324 txqi = ctx; 1325 local = vif_to_sdata(txqi->txq.vif)->local; 1326 hw = &local->hw; 1327 1328 ieee80211_free_txskb(hw, skb); 1329 } 1330 1331 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1332 struct fq_tin *tin, 1333 struct fq_flow *flow) 1334 { 1335 struct ieee80211_local *local; 1336 struct txq_info *txqi; 1337 struct codel_vars *cvars; 1338 struct codel_params *cparams; 1339 struct codel_stats *cstats; 1340 1341 local = container_of(fq, struct ieee80211_local, fq); 1342 txqi = container_of(tin, struct txq_info, tin); 1343 cstats = &txqi->cstats; 1344 1345 if (txqi->txq.sta) { 1346 struct sta_info *sta = container_of(txqi->txq.sta, 1347 struct sta_info, sta); 1348 cparams = &sta->cparams; 1349 } else { 1350 cparams = &local->cparams; 1351 } 1352 1353 if (flow == &tin->default_flow) 1354 cvars = &txqi->def_cvars; 1355 else 1356 cvars = &local->cvars[flow - fq->flows]; 1357 1358 return codel_dequeue(txqi, 1359 &flow->backlog, 1360 cparams, 1361 cvars, 1362 cstats, 1363 codel_skb_len_func, 1364 codel_skb_time_func, 1365 codel_drop_func, 1366 codel_dequeue_func); 1367 } 1368 1369 static void fq_skb_free_func(struct fq *fq, 1370 struct fq_tin *tin, 1371 struct fq_flow *flow, 1372 struct sk_buff *skb) 1373 { 1374 struct ieee80211_local *local; 1375 1376 local = container_of(fq, struct ieee80211_local, fq); 1377 ieee80211_free_txskb(&local->hw, skb); 1378 } 1379 1380 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1381 struct txq_info *txqi, 1382 struct sk_buff *skb) 1383 { 1384 struct fq *fq = &local->fq; 1385 struct fq_tin *tin = &txqi->tin; 1386 u32 flow_idx = fq_flow_idx(fq, skb); 1387 1388 ieee80211_set_skb_enqueue_time(skb); 1389 1390 spin_lock_bh(&fq->lock); 1391 /* 1392 * For management frames, don't really apply codel etc., 1393 * we don't want to apply any shaping or anything we just 1394 * want to simplify the driver API by having them on the 1395 * txqi. 1396 */ 1397 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1398 IEEE80211_SKB_CB(skb)->control.flags |= 1399 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1400 __skb_queue_tail(&txqi->frags, skb); 1401 } else { 1402 fq_tin_enqueue(fq, tin, flow_idx, skb, 1403 fq_skb_free_func); 1404 } 1405 spin_unlock_bh(&fq->lock); 1406 } 1407 1408 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1409 struct fq_flow *flow, struct sk_buff *skb, 1410 void *data) 1411 { 1412 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1413 1414 return info->control.vif == data; 1415 } 1416 1417 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1418 struct ieee80211_sub_if_data *sdata) 1419 { 1420 struct fq *fq = &local->fq; 1421 struct txq_info *txqi; 1422 struct fq_tin *tin; 1423 struct ieee80211_sub_if_data *ap; 1424 1425 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1426 return; 1427 1428 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1429 1430 if (!ap->vif.txq) 1431 return; 1432 1433 txqi = to_txq_info(ap->vif.txq); 1434 tin = &txqi->tin; 1435 1436 spin_lock_bh(&fq->lock); 1437 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1438 fq_skb_free_func); 1439 spin_unlock_bh(&fq->lock); 1440 } 1441 1442 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1443 struct sta_info *sta, 1444 struct txq_info *txqi, int tid) 1445 { 1446 fq_tin_init(&txqi->tin); 1447 codel_vars_init(&txqi->def_cvars); 1448 codel_stats_init(&txqi->cstats); 1449 __skb_queue_head_init(&txqi->frags); 1450 INIT_LIST_HEAD(&txqi->schedule_order); 1451 1452 txqi->txq.vif = &sdata->vif; 1453 1454 if (!sta) { 1455 sdata->vif.txq = &txqi->txq; 1456 txqi->txq.tid = 0; 1457 txqi->txq.ac = IEEE80211_AC_BE; 1458 1459 return; 1460 } 1461 1462 if (tid == IEEE80211_NUM_TIDS) { 1463 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1464 /* Drivers need to opt in to the management MPDU TXQ */ 1465 if (!ieee80211_hw_check(&sdata->local->hw, 1466 STA_MMPDU_TXQ)) 1467 return; 1468 } else if (!ieee80211_hw_check(&sdata->local->hw, 1469 BUFF_MMPDU_TXQ)) { 1470 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1471 return; 1472 } 1473 txqi->txq.ac = IEEE80211_AC_VO; 1474 } else { 1475 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1476 } 1477 1478 txqi->txq.sta = &sta->sta; 1479 txqi->txq.tid = tid; 1480 sta->sta.txq[tid] = &txqi->txq; 1481 } 1482 1483 void ieee80211_txq_purge(struct ieee80211_local *local, 1484 struct txq_info *txqi) 1485 { 1486 struct fq *fq = &local->fq; 1487 struct fq_tin *tin = &txqi->tin; 1488 1489 spin_lock_bh(&fq->lock); 1490 fq_tin_reset(fq, tin, fq_skb_free_func); 1491 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1492 spin_unlock_bh(&fq->lock); 1493 1494 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1495 list_del_init(&txqi->schedule_order); 1496 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1497 } 1498 1499 void ieee80211_txq_set_params(struct ieee80211_local *local) 1500 { 1501 if (local->hw.wiphy->txq_limit) 1502 local->fq.limit = local->hw.wiphy->txq_limit; 1503 else 1504 local->hw.wiphy->txq_limit = local->fq.limit; 1505 1506 if (local->hw.wiphy->txq_memory_limit) 1507 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1508 else 1509 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1510 1511 if (local->hw.wiphy->txq_quantum) 1512 local->fq.quantum = local->hw.wiphy->txq_quantum; 1513 else 1514 local->hw.wiphy->txq_quantum = local->fq.quantum; 1515 } 1516 1517 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1518 { 1519 struct fq *fq = &local->fq; 1520 int ret; 1521 int i; 1522 bool supp_vht = false; 1523 enum nl80211_band band; 1524 1525 if (!local->ops->wake_tx_queue) 1526 return 0; 1527 1528 ret = fq_init(fq, 4096); 1529 if (ret) 1530 return ret; 1531 1532 /* 1533 * If the hardware doesn't support VHT, it is safe to limit the maximum 1534 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1535 */ 1536 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1537 struct ieee80211_supported_band *sband; 1538 1539 sband = local->hw.wiphy->bands[band]; 1540 if (!sband) 1541 continue; 1542 1543 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1544 } 1545 1546 if (!supp_vht) 1547 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1548 1549 codel_params_init(&local->cparams); 1550 local->cparams.interval = MS2TIME(100); 1551 local->cparams.target = MS2TIME(20); 1552 local->cparams.ecn = true; 1553 1554 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1555 GFP_KERNEL); 1556 if (!local->cvars) { 1557 spin_lock_bh(&fq->lock); 1558 fq_reset(fq, fq_skb_free_func); 1559 spin_unlock_bh(&fq->lock); 1560 return -ENOMEM; 1561 } 1562 1563 for (i = 0; i < fq->flows_cnt; i++) 1564 codel_vars_init(&local->cvars[i]); 1565 1566 ieee80211_txq_set_params(local); 1567 1568 return 0; 1569 } 1570 1571 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1572 { 1573 struct fq *fq = &local->fq; 1574 1575 if (!local->ops->wake_tx_queue) 1576 return; 1577 1578 kfree(local->cvars); 1579 local->cvars = NULL; 1580 1581 spin_lock_bh(&fq->lock); 1582 fq_reset(fq, fq_skb_free_func); 1583 spin_unlock_bh(&fq->lock); 1584 } 1585 1586 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1587 struct ieee80211_sub_if_data *sdata, 1588 struct sta_info *sta, 1589 struct sk_buff *skb) 1590 { 1591 struct ieee80211_vif *vif; 1592 struct txq_info *txqi; 1593 1594 if (!local->ops->wake_tx_queue || 1595 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1596 return false; 1597 1598 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1599 sdata = container_of(sdata->bss, 1600 struct ieee80211_sub_if_data, u.ap); 1601 1602 vif = &sdata->vif; 1603 txqi = ieee80211_get_txq(local, vif, sta, skb); 1604 1605 if (!txqi) 1606 return false; 1607 1608 ieee80211_txq_enqueue(local, txqi, skb); 1609 1610 schedule_and_wake_txq(local, txqi); 1611 1612 return true; 1613 } 1614 1615 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1616 struct ieee80211_vif *vif, 1617 struct sta_info *sta, 1618 struct sk_buff_head *skbs, 1619 bool txpending) 1620 { 1621 struct ieee80211_tx_control control = {}; 1622 struct sk_buff *skb, *tmp; 1623 unsigned long flags; 1624 1625 skb_queue_walk_safe(skbs, skb, tmp) { 1626 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1627 int q = info->hw_queue; 1628 1629 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1630 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1631 __skb_unlink(skb, skbs); 1632 ieee80211_free_txskb(&local->hw, skb); 1633 continue; 1634 } 1635 #endif 1636 1637 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1638 if (local->queue_stop_reasons[q] || 1639 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1640 if (unlikely(info->flags & 1641 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1642 if (local->queue_stop_reasons[q] & 1643 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1644 /* 1645 * Drop off-channel frames if queues 1646 * are stopped for any reason other 1647 * than off-channel operation. Never 1648 * queue them. 1649 */ 1650 spin_unlock_irqrestore( 1651 &local->queue_stop_reason_lock, 1652 flags); 1653 ieee80211_purge_tx_queue(&local->hw, 1654 skbs); 1655 return true; 1656 } 1657 } else { 1658 1659 /* 1660 * Since queue is stopped, queue up frames for 1661 * later transmission from the tx-pending 1662 * tasklet when the queue is woken again. 1663 */ 1664 if (txpending) 1665 skb_queue_splice_init(skbs, 1666 &local->pending[q]); 1667 else 1668 skb_queue_splice_tail_init(skbs, 1669 &local->pending[q]); 1670 1671 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1672 flags); 1673 return false; 1674 } 1675 } 1676 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1677 1678 info->control.vif = vif; 1679 control.sta = sta ? &sta->sta : NULL; 1680 1681 __skb_unlink(skb, skbs); 1682 drv_tx(local, &control, skb); 1683 } 1684 1685 return true; 1686 } 1687 1688 /* 1689 * Returns false if the frame couldn't be transmitted but was queued instead. 1690 */ 1691 static bool __ieee80211_tx(struct ieee80211_local *local, 1692 struct sk_buff_head *skbs, int led_len, 1693 struct sta_info *sta, bool txpending) 1694 { 1695 struct ieee80211_tx_info *info; 1696 struct ieee80211_sub_if_data *sdata; 1697 struct ieee80211_vif *vif; 1698 struct sk_buff *skb; 1699 bool result; 1700 __le16 fc; 1701 1702 if (WARN_ON(skb_queue_empty(skbs))) 1703 return true; 1704 1705 skb = skb_peek(skbs); 1706 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1707 info = IEEE80211_SKB_CB(skb); 1708 sdata = vif_to_sdata(info->control.vif); 1709 if (sta && !sta->uploaded) 1710 sta = NULL; 1711 1712 switch (sdata->vif.type) { 1713 case NL80211_IFTYPE_MONITOR: 1714 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1715 vif = &sdata->vif; 1716 break; 1717 } 1718 sdata = rcu_dereference(local->monitor_sdata); 1719 if (sdata) { 1720 vif = &sdata->vif; 1721 info->hw_queue = 1722 vif->hw_queue[skb_get_queue_mapping(skb)]; 1723 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1724 ieee80211_purge_tx_queue(&local->hw, skbs); 1725 return true; 1726 } else 1727 vif = NULL; 1728 break; 1729 case NL80211_IFTYPE_AP_VLAN: 1730 sdata = container_of(sdata->bss, 1731 struct ieee80211_sub_if_data, u.ap); 1732 fallthrough; 1733 default: 1734 vif = &sdata->vif; 1735 break; 1736 } 1737 1738 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1739 1740 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1741 1742 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1743 1744 return result; 1745 } 1746 1747 /* 1748 * Invoke TX handlers, return 0 on success and non-zero if the 1749 * frame was dropped or queued. 1750 * 1751 * The handlers are split into an early and late part. The latter is everything 1752 * that can be sensitive to reordering, and will be deferred to after packets 1753 * are dequeued from the intermediate queues (when they are enabled). 1754 */ 1755 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1756 { 1757 ieee80211_tx_result res = TX_DROP; 1758 1759 #define CALL_TXH(txh) \ 1760 do { \ 1761 res = txh(tx); \ 1762 if (res != TX_CONTINUE) \ 1763 goto txh_done; \ 1764 } while (0) 1765 1766 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1767 CALL_TXH(ieee80211_tx_h_check_assoc); 1768 CALL_TXH(ieee80211_tx_h_ps_buf); 1769 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1770 CALL_TXH(ieee80211_tx_h_select_key); 1771 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1772 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1773 1774 txh_done: 1775 if (unlikely(res == TX_DROP)) { 1776 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1777 if (tx->skb) 1778 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1779 else 1780 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1781 return -1; 1782 } else if (unlikely(res == TX_QUEUED)) { 1783 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1784 return -1; 1785 } 1786 1787 return 0; 1788 } 1789 1790 /* 1791 * Late handlers can be called while the sta lock is held. Handlers that can 1792 * cause packets to be generated will cause deadlock! 1793 */ 1794 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1795 { 1796 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1797 ieee80211_tx_result res = TX_CONTINUE; 1798 1799 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1800 __skb_queue_tail(&tx->skbs, tx->skb); 1801 tx->skb = NULL; 1802 goto txh_done; 1803 } 1804 1805 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1806 CALL_TXH(ieee80211_tx_h_sequence); 1807 CALL_TXH(ieee80211_tx_h_fragment); 1808 /* handlers after fragment must be aware of tx info fragmentation! */ 1809 CALL_TXH(ieee80211_tx_h_stats); 1810 CALL_TXH(ieee80211_tx_h_encrypt); 1811 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1812 CALL_TXH(ieee80211_tx_h_calculate_duration); 1813 #undef CALL_TXH 1814 1815 txh_done: 1816 if (unlikely(res == TX_DROP)) { 1817 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1818 if (tx->skb) 1819 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1820 else 1821 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1822 return -1; 1823 } else if (unlikely(res == TX_QUEUED)) { 1824 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1825 return -1; 1826 } 1827 1828 return 0; 1829 } 1830 1831 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1832 { 1833 int r = invoke_tx_handlers_early(tx); 1834 1835 if (r) 1836 return r; 1837 return invoke_tx_handlers_late(tx); 1838 } 1839 1840 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1841 struct ieee80211_vif *vif, struct sk_buff *skb, 1842 int band, struct ieee80211_sta **sta) 1843 { 1844 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1845 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1846 struct ieee80211_tx_data tx; 1847 struct sk_buff *skb2; 1848 1849 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1850 return false; 1851 1852 info->band = band; 1853 info->control.vif = vif; 1854 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1855 1856 if (invoke_tx_handlers(&tx)) 1857 return false; 1858 1859 if (sta) { 1860 if (tx.sta) 1861 *sta = &tx.sta->sta; 1862 else 1863 *sta = NULL; 1864 } 1865 1866 /* this function isn't suitable for fragmented data frames */ 1867 skb2 = __skb_dequeue(&tx.skbs); 1868 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1869 ieee80211_free_txskb(hw, skb2); 1870 ieee80211_purge_tx_queue(hw, &tx.skbs); 1871 return false; 1872 } 1873 1874 return true; 1875 } 1876 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1877 1878 /* 1879 * Returns false if the frame couldn't be transmitted but was queued instead. 1880 */ 1881 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1882 struct sta_info *sta, struct sk_buff *skb, 1883 bool txpending) 1884 { 1885 struct ieee80211_local *local = sdata->local; 1886 struct ieee80211_tx_data tx; 1887 ieee80211_tx_result res_prepare; 1888 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1889 bool result = true; 1890 int led_len; 1891 1892 if (unlikely(skb->len < 10)) { 1893 dev_kfree_skb(skb); 1894 return true; 1895 } 1896 1897 /* initialises tx */ 1898 led_len = skb->len; 1899 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1900 1901 if (unlikely(res_prepare == TX_DROP)) { 1902 ieee80211_free_txskb(&local->hw, skb); 1903 return true; 1904 } else if (unlikely(res_prepare == TX_QUEUED)) { 1905 return true; 1906 } 1907 1908 /* set up hw_queue value early */ 1909 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1910 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1911 info->hw_queue = 1912 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1913 1914 if (invoke_tx_handlers_early(&tx)) 1915 return true; 1916 1917 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1918 return true; 1919 1920 if (!invoke_tx_handlers_late(&tx)) 1921 result = __ieee80211_tx(local, &tx.skbs, led_len, 1922 tx.sta, txpending); 1923 1924 return result; 1925 } 1926 1927 /* device xmit handlers */ 1928 1929 enum ieee80211_encrypt { 1930 ENCRYPT_NO, 1931 ENCRYPT_MGMT, 1932 ENCRYPT_DATA, 1933 }; 1934 1935 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1936 struct sk_buff *skb, 1937 int head_need, 1938 enum ieee80211_encrypt encrypt) 1939 { 1940 struct ieee80211_local *local = sdata->local; 1941 bool enc_tailroom; 1942 int tail_need = 0; 1943 1944 enc_tailroom = encrypt == ENCRYPT_MGMT || 1945 (encrypt == ENCRYPT_DATA && 1946 sdata->crypto_tx_tailroom_needed_cnt); 1947 1948 if (enc_tailroom) { 1949 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1950 tail_need -= skb_tailroom(skb); 1951 tail_need = max_t(int, tail_need, 0); 1952 } 1953 1954 if (skb_cloned(skb) && 1955 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1956 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1957 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1958 else if (head_need || tail_need) 1959 I802_DEBUG_INC(local->tx_expand_skb_head); 1960 else 1961 return 0; 1962 1963 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1964 wiphy_debug(local->hw.wiphy, 1965 "failed to reallocate TX buffer\n"); 1966 return -ENOMEM; 1967 } 1968 1969 return 0; 1970 } 1971 1972 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1973 struct sta_info *sta, struct sk_buff *skb) 1974 { 1975 struct ieee80211_local *local = sdata->local; 1976 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1977 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1978 int headroom; 1979 enum ieee80211_encrypt encrypt; 1980 1981 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 1982 encrypt = ENCRYPT_NO; 1983 else if (ieee80211_is_mgmt(hdr->frame_control)) 1984 encrypt = ENCRYPT_MGMT; 1985 else 1986 encrypt = ENCRYPT_DATA; 1987 1988 headroom = local->tx_headroom; 1989 if (encrypt != ENCRYPT_NO) 1990 headroom += sdata->encrypt_headroom; 1991 headroom -= skb_headroom(skb); 1992 headroom = max_t(int, 0, headroom); 1993 1994 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 1995 ieee80211_free_txskb(&local->hw, skb); 1996 return; 1997 } 1998 1999 /* reload after potential resize */ 2000 hdr = (struct ieee80211_hdr *) skb->data; 2001 info->control.vif = &sdata->vif; 2002 2003 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2004 if (ieee80211_is_data(hdr->frame_control) && 2005 is_unicast_ether_addr(hdr->addr1)) { 2006 if (mesh_nexthop_resolve(sdata, skb)) 2007 return; /* skb queued: don't free */ 2008 } else { 2009 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2010 } 2011 } 2012 2013 ieee80211_set_qos_hdr(sdata, skb); 2014 ieee80211_tx(sdata, sta, skb, false); 2015 } 2016 2017 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2018 { 2019 struct ieee80211_radiotap_header *rthdr = 2020 (struct ieee80211_radiotap_header *)skb->data; 2021 2022 /* check for not even having the fixed radiotap header part */ 2023 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2024 return false; /* too short to be possibly valid */ 2025 2026 /* is it a header version we can trust to find length from? */ 2027 if (unlikely(rthdr->it_version)) 2028 return false; /* only version 0 is supported */ 2029 2030 /* does the skb contain enough to deliver on the alleged length? */ 2031 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2032 return false; /* skb too short for claimed rt header extent */ 2033 2034 return true; 2035 } 2036 2037 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2038 struct net_device *dev) 2039 { 2040 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2041 struct ieee80211_radiotap_iterator iterator; 2042 struct ieee80211_radiotap_header *rthdr = 2043 (struct ieee80211_radiotap_header *) skb->data; 2044 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2045 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2046 NULL); 2047 u16 txflags; 2048 u16 rate = 0; 2049 bool rate_found = false; 2050 u8 rate_retries = 0; 2051 u16 rate_flags = 0; 2052 u8 mcs_known, mcs_flags, mcs_bw; 2053 u16 vht_known; 2054 u8 vht_mcs = 0, vht_nss = 0; 2055 int i; 2056 2057 if (!ieee80211_validate_radiotap_len(skb)) 2058 return false; 2059 2060 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2061 IEEE80211_TX_CTL_DONTFRAG; 2062 2063 /* 2064 * for every radiotap entry that is present 2065 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2066 * entries present, or -EINVAL on error) 2067 */ 2068 2069 while (!ret) { 2070 ret = ieee80211_radiotap_iterator_next(&iterator); 2071 2072 if (ret) 2073 continue; 2074 2075 /* see if this argument is something we can use */ 2076 switch (iterator.this_arg_index) { 2077 /* 2078 * You must take care when dereferencing iterator.this_arg 2079 * for multibyte types... the pointer is not aligned. Use 2080 * get_unaligned((type *)iterator.this_arg) to dereference 2081 * iterator.this_arg for type "type" safely on all arches. 2082 */ 2083 case IEEE80211_RADIOTAP_FLAGS: 2084 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2085 /* 2086 * this indicates that the skb we have been 2087 * handed has the 32-bit FCS CRC at the end... 2088 * we should react to that by snipping it off 2089 * because it will be recomputed and added 2090 * on transmission 2091 */ 2092 if (skb->len < (iterator._max_length + FCS_LEN)) 2093 return false; 2094 2095 skb_trim(skb, skb->len - FCS_LEN); 2096 } 2097 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2098 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2099 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2100 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2101 break; 2102 2103 case IEEE80211_RADIOTAP_TX_FLAGS: 2104 txflags = get_unaligned_le16(iterator.this_arg); 2105 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2106 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2107 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2108 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2109 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2110 info->control.flags |= 2111 IEEE80211_TX_CTRL_DONT_REORDER; 2112 break; 2113 2114 case IEEE80211_RADIOTAP_RATE: 2115 rate = *iterator.this_arg; 2116 rate_flags = 0; 2117 rate_found = true; 2118 break; 2119 2120 case IEEE80211_RADIOTAP_DATA_RETRIES: 2121 rate_retries = *iterator.this_arg; 2122 break; 2123 2124 case IEEE80211_RADIOTAP_MCS: 2125 mcs_known = iterator.this_arg[0]; 2126 mcs_flags = iterator.this_arg[1]; 2127 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2128 break; 2129 2130 rate_found = true; 2131 rate = iterator.this_arg[2]; 2132 rate_flags = IEEE80211_TX_RC_MCS; 2133 2134 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2135 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2136 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2137 2138 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2139 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2140 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2141 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2142 2143 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2144 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2145 info->flags |= IEEE80211_TX_CTL_LDPC; 2146 2147 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2148 u8 stbc = u8_get_bits(mcs_flags, 2149 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2150 2151 info->flags |= 2152 u32_encode_bits(stbc, 2153 IEEE80211_TX_CTL_STBC); 2154 } 2155 break; 2156 2157 case IEEE80211_RADIOTAP_VHT: 2158 vht_known = get_unaligned_le16(iterator.this_arg); 2159 rate_found = true; 2160 2161 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2162 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2163 (iterator.this_arg[2] & 2164 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2165 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2166 if (vht_known & 2167 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2168 if (iterator.this_arg[3] == 1) 2169 rate_flags |= 2170 IEEE80211_TX_RC_40_MHZ_WIDTH; 2171 else if (iterator.this_arg[3] == 4) 2172 rate_flags |= 2173 IEEE80211_TX_RC_80_MHZ_WIDTH; 2174 else if (iterator.this_arg[3] == 11) 2175 rate_flags |= 2176 IEEE80211_TX_RC_160_MHZ_WIDTH; 2177 } 2178 2179 vht_mcs = iterator.this_arg[4] >> 4; 2180 vht_nss = iterator.this_arg[4] & 0xF; 2181 break; 2182 2183 /* 2184 * Please update the file 2185 * Documentation/networking/mac80211-injection.rst 2186 * when parsing new fields here. 2187 */ 2188 2189 default: 2190 break; 2191 } 2192 } 2193 2194 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2195 return false; 2196 2197 if (rate_found) { 2198 struct ieee80211_supported_band *sband = 2199 local->hw.wiphy->bands[info->band]; 2200 2201 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2202 2203 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2204 info->control.rates[i].idx = -1; 2205 info->control.rates[i].flags = 0; 2206 info->control.rates[i].count = 0; 2207 } 2208 2209 if (rate_flags & IEEE80211_TX_RC_MCS) { 2210 info->control.rates[0].idx = rate; 2211 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2212 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2213 vht_nss); 2214 } else if (sband) { 2215 for (i = 0; i < sband->n_bitrates; i++) { 2216 if (rate * 5 != sband->bitrates[i].bitrate) 2217 continue; 2218 2219 info->control.rates[0].idx = i; 2220 break; 2221 } 2222 } 2223 2224 if (info->control.rates[0].idx < 0) 2225 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2226 2227 info->control.rates[0].flags = rate_flags; 2228 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2229 local->hw.max_rate_tries); 2230 } 2231 2232 return true; 2233 } 2234 2235 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2236 struct net_device *dev) 2237 { 2238 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2239 struct ieee80211_chanctx_conf *chanctx_conf; 2240 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2241 struct ieee80211_hdr *hdr; 2242 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2243 struct cfg80211_chan_def *chandef; 2244 u16 len_rthdr; 2245 int hdrlen; 2246 2247 memset(info, 0, sizeof(*info)); 2248 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2249 IEEE80211_TX_CTL_INJECTED; 2250 2251 /* Sanity-check the length of the radiotap header */ 2252 if (!ieee80211_validate_radiotap_len(skb)) 2253 goto fail; 2254 2255 /* we now know there is a radiotap header with a length we can use */ 2256 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2257 2258 /* 2259 * fix up the pointers accounting for the radiotap 2260 * header still being in there. We are being given 2261 * a precooked IEEE80211 header so no need for 2262 * normal processing 2263 */ 2264 skb_set_mac_header(skb, len_rthdr); 2265 /* 2266 * these are just fixed to the end of the rt area since we 2267 * don't have any better information and at this point, nobody cares 2268 */ 2269 skb_set_network_header(skb, len_rthdr); 2270 skb_set_transport_header(skb, len_rthdr); 2271 2272 if (skb->len < len_rthdr + 2) 2273 goto fail; 2274 2275 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2276 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2277 2278 if (skb->len < len_rthdr + hdrlen) 2279 goto fail; 2280 2281 /* 2282 * Initialize skb->protocol if the injected frame is a data frame 2283 * carrying a rfc1042 header 2284 */ 2285 if (ieee80211_is_data(hdr->frame_control) && 2286 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2287 u8 *payload = (u8 *)hdr + hdrlen; 2288 2289 if (ether_addr_equal(payload, rfc1042_header)) 2290 skb->protocol = cpu_to_be16((payload[6] << 8) | 2291 payload[7]); 2292 } 2293 2294 rcu_read_lock(); 2295 2296 /* 2297 * We process outgoing injected frames that have a local address 2298 * we handle as though they are non-injected frames. 2299 * This code here isn't entirely correct, the local MAC address 2300 * isn't always enough to find the interface to use; for proper 2301 * VLAN support we have an nl80211-based mechanism. 2302 * 2303 * This is necessary, for example, for old hostapd versions that 2304 * don't use nl80211-based management TX/RX. 2305 */ 2306 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2307 2308 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2309 if (!ieee80211_sdata_running(tmp_sdata)) 2310 continue; 2311 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2312 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2313 continue; 2314 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2315 sdata = tmp_sdata; 2316 break; 2317 } 2318 } 2319 2320 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2321 if (!chanctx_conf) { 2322 tmp_sdata = rcu_dereference(local->monitor_sdata); 2323 if (tmp_sdata) 2324 chanctx_conf = 2325 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2326 } 2327 2328 if (chanctx_conf) 2329 chandef = &chanctx_conf->def; 2330 else if (!local->use_chanctx) 2331 chandef = &local->_oper_chandef; 2332 else 2333 goto fail_rcu; 2334 2335 /* 2336 * Frame injection is not allowed if beaconing is not allowed 2337 * or if we need radar detection. Beaconing is usually not allowed when 2338 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2339 * Passive scan is also used in world regulatory domains where 2340 * your country is not known and as such it should be treated as 2341 * NO TX unless the channel is explicitly allowed in which case 2342 * your current regulatory domain would not have the passive scan 2343 * flag. 2344 * 2345 * Since AP mode uses monitor interfaces to inject/TX management 2346 * frames we can make AP mode the exception to this rule once it 2347 * supports radar detection as its implementation can deal with 2348 * radar detection by itself. We can do that later by adding a 2349 * monitor flag interfaces used for AP support. 2350 */ 2351 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2352 sdata->vif.type)) 2353 goto fail_rcu; 2354 2355 info->band = chandef->chan->band; 2356 2357 /* Initialize skb->priority according to frame type and TID class, 2358 * with respect to the sub interface that the frame will actually 2359 * be transmitted on. If the DONT_REORDER flag is set, the original 2360 * skb-priority is preserved to assure frames injected with this 2361 * flag are not reordered relative to each other. 2362 */ 2363 ieee80211_select_queue_80211(sdata, skb, hdr); 2364 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2365 2366 /* 2367 * Process the radiotap header. This will now take into account the 2368 * selected chandef above to accurately set injection rates and 2369 * retransmissions. 2370 */ 2371 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2372 goto fail_rcu; 2373 2374 /* remove the injection radiotap header */ 2375 skb_pull(skb, len_rthdr); 2376 2377 ieee80211_xmit(sdata, NULL, skb); 2378 rcu_read_unlock(); 2379 2380 return NETDEV_TX_OK; 2381 2382 fail_rcu: 2383 rcu_read_unlock(); 2384 fail: 2385 dev_kfree_skb(skb); 2386 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2387 } 2388 2389 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2390 { 2391 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2392 2393 return ethertype == ETH_P_TDLS && 2394 skb->len > 14 && 2395 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2396 } 2397 2398 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2399 struct sk_buff *skb, 2400 struct sta_info **sta_out) 2401 { 2402 struct sta_info *sta; 2403 2404 switch (sdata->vif.type) { 2405 case NL80211_IFTYPE_AP_VLAN: 2406 sta = rcu_dereference(sdata->u.vlan.sta); 2407 if (sta) { 2408 *sta_out = sta; 2409 return 0; 2410 } else if (sdata->wdev.use_4addr) { 2411 return -ENOLINK; 2412 } 2413 fallthrough; 2414 case NL80211_IFTYPE_AP: 2415 case NL80211_IFTYPE_OCB: 2416 case NL80211_IFTYPE_ADHOC: 2417 if (is_multicast_ether_addr(skb->data)) { 2418 *sta_out = ERR_PTR(-ENOENT); 2419 return 0; 2420 } 2421 sta = sta_info_get_bss(sdata, skb->data); 2422 break; 2423 #ifdef CONFIG_MAC80211_MESH 2424 case NL80211_IFTYPE_MESH_POINT: 2425 /* determined much later */ 2426 *sta_out = NULL; 2427 return 0; 2428 #endif 2429 case NL80211_IFTYPE_STATION: 2430 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2431 sta = sta_info_get(sdata, skb->data); 2432 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2433 if (test_sta_flag(sta, 2434 WLAN_STA_TDLS_PEER_AUTH)) { 2435 *sta_out = sta; 2436 return 0; 2437 } 2438 2439 /* 2440 * TDLS link during setup - throw out frames to 2441 * peer. Allow TDLS-setup frames to unauthorized 2442 * peers for the special case of a link teardown 2443 * after a TDLS sta is removed due to being 2444 * unreachable. 2445 */ 2446 if (!ieee80211_is_tdls_setup(skb)) 2447 return -EINVAL; 2448 } 2449 2450 } 2451 2452 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2453 if (!sta) 2454 return -ENOLINK; 2455 break; 2456 default: 2457 return -EINVAL; 2458 } 2459 2460 *sta_out = sta ?: ERR_PTR(-ENOENT); 2461 return 0; 2462 } 2463 2464 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2465 struct sk_buff *skb, 2466 u32 *info_flags, 2467 u64 *cookie) 2468 { 2469 struct sk_buff *ack_skb; 2470 u16 info_id = 0; 2471 2472 if (skb->sk) 2473 ack_skb = skb_clone_sk(skb); 2474 else 2475 ack_skb = skb_clone(skb, GFP_ATOMIC); 2476 2477 if (ack_skb) { 2478 unsigned long flags; 2479 int id; 2480 2481 spin_lock_irqsave(&local->ack_status_lock, flags); 2482 id = idr_alloc(&local->ack_status_frames, ack_skb, 2483 1, 0x2000, GFP_ATOMIC); 2484 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2485 2486 if (id >= 0) { 2487 info_id = id; 2488 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2489 if (cookie) { 2490 *cookie = ieee80211_mgmt_tx_cookie(local); 2491 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2492 } 2493 } else { 2494 kfree_skb(ack_skb); 2495 } 2496 } 2497 2498 return info_id; 2499 } 2500 2501 /** 2502 * ieee80211_build_hdr - build 802.11 header in the given frame 2503 * @sdata: virtual interface to build the header for 2504 * @skb: the skb to build the header in 2505 * @info_flags: skb flags to set 2506 * @sta: the station pointer 2507 * @ctrl_flags: info control flags to set 2508 * @cookie: cookie pointer to fill (if not %NULL) 2509 * 2510 * This function takes the skb with 802.3 header and reformats the header to 2511 * the appropriate IEEE 802.11 header based on which interface the packet is 2512 * being transmitted on. 2513 * 2514 * Note that this function also takes care of the TX status request and 2515 * potential unsharing of the SKB - this needs to be interleaved with the 2516 * header building. 2517 * 2518 * The function requires the read-side RCU lock held 2519 * 2520 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2521 */ 2522 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2523 struct sk_buff *skb, u32 info_flags, 2524 struct sta_info *sta, u32 ctrl_flags, 2525 u64 *cookie) 2526 { 2527 struct ieee80211_local *local = sdata->local; 2528 struct ieee80211_tx_info *info; 2529 int head_need; 2530 u16 ethertype, hdrlen, meshhdrlen = 0; 2531 __le16 fc; 2532 struct ieee80211_hdr hdr; 2533 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2534 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2535 const u8 *encaps_data; 2536 int encaps_len, skip_header_bytes; 2537 bool wme_sta = false, authorized = false; 2538 bool tdls_peer; 2539 bool multicast; 2540 u16 info_id = 0; 2541 struct ieee80211_chanctx_conf *chanctx_conf; 2542 struct ieee80211_sub_if_data *ap_sdata; 2543 enum nl80211_band band; 2544 int ret; 2545 2546 if (IS_ERR(sta)) 2547 sta = NULL; 2548 2549 #ifdef CONFIG_MAC80211_DEBUGFS 2550 if (local->force_tx_status) 2551 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2552 #endif 2553 2554 /* convert Ethernet header to proper 802.11 header (based on 2555 * operation mode) */ 2556 ethertype = (skb->data[12] << 8) | skb->data[13]; 2557 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2558 2559 switch (sdata->vif.type) { 2560 case NL80211_IFTYPE_AP_VLAN: 2561 if (sdata->wdev.use_4addr) { 2562 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2563 /* RA TA DA SA */ 2564 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2565 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2566 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2567 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2568 hdrlen = 30; 2569 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2570 wme_sta = sta->sta.wme; 2571 } 2572 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2573 u.ap); 2574 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2575 if (!chanctx_conf) { 2576 ret = -ENOTCONN; 2577 goto free; 2578 } 2579 band = chanctx_conf->def.chan->band; 2580 if (sdata->wdev.use_4addr) 2581 break; 2582 fallthrough; 2583 case NL80211_IFTYPE_AP: 2584 if (sdata->vif.type == NL80211_IFTYPE_AP) 2585 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2586 if (!chanctx_conf) { 2587 ret = -ENOTCONN; 2588 goto free; 2589 } 2590 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2591 /* DA BSSID SA */ 2592 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2593 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2594 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2595 hdrlen = 24; 2596 band = chanctx_conf->def.chan->band; 2597 break; 2598 #ifdef CONFIG_MAC80211_MESH 2599 case NL80211_IFTYPE_MESH_POINT: 2600 if (!is_multicast_ether_addr(skb->data)) { 2601 struct sta_info *next_hop; 2602 bool mpp_lookup = true; 2603 2604 mpath = mesh_path_lookup(sdata, skb->data); 2605 if (mpath) { 2606 mpp_lookup = false; 2607 next_hop = rcu_dereference(mpath->next_hop); 2608 if (!next_hop || 2609 !(mpath->flags & (MESH_PATH_ACTIVE | 2610 MESH_PATH_RESOLVING))) 2611 mpp_lookup = true; 2612 } 2613 2614 if (mpp_lookup) { 2615 mppath = mpp_path_lookup(sdata, skb->data); 2616 if (mppath) 2617 mppath->exp_time = jiffies; 2618 } 2619 2620 if (mppath && mpath) 2621 mesh_path_del(sdata, mpath->dst); 2622 } 2623 2624 /* 2625 * Use address extension if it is a packet from 2626 * another interface or if we know the destination 2627 * is being proxied by a portal (i.e. portal address 2628 * differs from proxied address) 2629 */ 2630 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2631 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2632 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2633 skb->data, skb->data + ETH_ALEN); 2634 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2635 NULL, NULL); 2636 } else { 2637 /* DS -> MBSS (802.11-2012 13.11.3.3). 2638 * For unicast with unknown forwarding information, 2639 * destination might be in the MBSS or if that fails 2640 * forwarded to another mesh gate. In either case 2641 * resolution will be handled in ieee80211_xmit(), so 2642 * leave the original DA. This also works for mcast */ 2643 const u8 *mesh_da = skb->data; 2644 2645 if (mppath) 2646 mesh_da = mppath->mpp; 2647 else if (mpath) 2648 mesh_da = mpath->dst; 2649 2650 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2651 mesh_da, sdata->vif.addr); 2652 if (is_multicast_ether_addr(mesh_da)) 2653 /* DA TA mSA AE:SA */ 2654 meshhdrlen = ieee80211_new_mesh_header( 2655 sdata, &mesh_hdr, 2656 skb->data + ETH_ALEN, NULL); 2657 else 2658 /* RA TA mDA mSA AE:DA SA */ 2659 meshhdrlen = ieee80211_new_mesh_header( 2660 sdata, &mesh_hdr, skb->data, 2661 skb->data + ETH_ALEN); 2662 2663 } 2664 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2665 if (!chanctx_conf) { 2666 ret = -ENOTCONN; 2667 goto free; 2668 } 2669 band = chanctx_conf->def.chan->band; 2670 2671 /* For injected frames, fill RA right away as nexthop lookup 2672 * will be skipped. 2673 */ 2674 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2675 is_zero_ether_addr(hdr.addr1)) 2676 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2677 break; 2678 #endif 2679 case NL80211_IFTYPE_STATION: 2680 /* we already did checks when looking up the RA STA */ 2681 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2682 2683 if (tdls_peer) { 2684 /* DA SA BSSID */ 2685 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2686 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2687 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2688 hdrlen = 24; 2689 } else if (sdata->u.mgd.use_4addr && 2690 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2691 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2692 IEEE80211_FCTL_TODS); 2693 /* RA TA DA SA */ 2694 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2695 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2696 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2697 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2698 hdrlen = 30; 2699 } else { 2700 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2701 /* BSSID SA DA */ 2702 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2703 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2704 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2705 hdrlen = 24; 2706 } 2707 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2708 if (!chanctx_conf) { 2709 ret = -ENOTCONN; 2710 goto free; 2711 } 2712 band = chanctx_conf->def.chan->band; 2713 break; 2714 case NL80211_IFTYPE_OCB: 2715 /* DA SA BSSID */ 2716 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2717 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2718 eth_broadcast_addr(hdr.addr3); 2719 hdrlen = 24; 2720 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2721 if (!chanctx_conf) { 2722 ret = -ENOTCONN; 2723 goto free; 2724 } 2725 band = chanctx_conf->def.chan->band; 2726 break; 2727 case NL80211_IFTYPE_ADHOC: 2728 /* DA SA BSSID */ 2729 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2730 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2731 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2732 hdrlen = 24; 2733 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2734 if (!chanctx_conf) { 2735 ret = -ENOTCONN; 2736 goto free; 2737 } 2738 band = chanctx_conf->def.chan->band; 2739 break; 2740 default: 2741 ret = -EINVAL; 2742 goto free; 2743 } 2744 2745 multicast = is_multicast_ether_addr(hdr.addr1); 2746 2747 /* sta is always NULL for mesh */ 2748 if (sta) { 2749 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2750 wme_sta = sta->sta.wme; 2751 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2752 /* For mesh, the use of the QoS header is mandatory */ 2753 wme_sta = true; 2754 } 2755 2756 /* receiver does QoS (which also means we do) use it */ 2757 if (wme_sta) { 2758 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2759 hdrlen += 2; 2760 } 2761 2762 /* 2763 * Drop unicast frames to unauthorised stations unless they are 2764 * EAPOL frames from the local station. 2765 */ 2766 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2767 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2768 !multicast && !authorized && 2769 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2770 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2771 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2772 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2773 sdata->name, hdr.addr1); 2774 #endif 2775 2776 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2777 2778 ret = -EPERM; 2779 goto free; 2780 } 2781 2782 if (unlikely(!multicast && ((skb->sk && 2783 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2784 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2785 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2786 cookie); 2787 2788 /* 2789 * If the skb is shared we need to obtain our own copy. 2790 */ 2791 if (skb_shared(skb)) { 2792 struct sk_buff *tmp_skb = skb; 2793 2794 /* can't happen -- skb is a clone if info_id != 0 */ 2795 WARN_ON(info_id); 2796 2797 skb = skb_clone(skb, GFP_ATOMIC); 2798 kfree_skb(tmp_skb); 2799 2800 if (!skb) { 2801 ret = -ENOMEM; 2802 goto free; 2803 } 2804 } 2805 2806 hdr.frame_control = fc; 2807 hdr.duration_id = 0; 2808 hdr.seq_ctrl = 0; 2809 2810 skip_header_bytes = ETH_HLEN; 2811 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2812 encaps_data = bridge_tunnel_header; 2813 encaps_len = sizeof(bridge_tunnel_header); 2814 skip_header_bytes -= 2; 2815 } else if (ethertype >= ETH_P_802_3_MIN) { 2816 encaps_data = rfc1042_header; 2817 encaps_len = sizeof(rfc1042_header); 2818 skip_header_bytes -= 2; 2819 } else { 2820 encaps_data = NULL; 2821 encaps_len = 0; 2822 } 2823 2824 skb_pull(skb, skip_header_bytes); 2825 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2826 2827 /* 2828 * So we need to modify the skb header and hence need a copy of 2829 * that. The head_need variable above doesn't, so far, include 2830 * the needed header space that we don't need right away. If we 2831 * can, then we don't reallocate right now but only after the 2832 * frame arrives at the master device (if it does...) 2833 * 2834 * If we cannot, however, then we will reallocate to include all 2835 * the ever needed space. Also, if we need to reallocate it anyway, 2836 * make it big enough for everything we may ever need. 2837 */ 2838 2839 if (head_need > 0 || skb_cloned(skb)) { 2840 head_need += sdata->encrypt_headroom; 2841 head_need += local->tx_headroom; 2842 head_need = max_t(int, 0, head_need); 2843 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2844 ieee80211_free_txskb(&local->hw, skb); 2845 skb = NULL; 2846 return ERR_PTR(-ENOMEM); 2847 } 2848 } 2849 2850 if (encaps_data) 2851 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2852 2853 #ifdef CONFIG_MAC80211_MESH 2854 if (meshhdrlen > 0) 2855 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2856 #endif 2857 2858 if (ieee80211_is_data_qos(fc)) { 2859 __le16 *qos_control; 2860 2861 qos_control = skb_push(skb, 2); 2862 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2863 /* 2864 * Maybe we could actually set some fields here, for now just 2865 * initialise to zero to indicate no special operation. 2866 */ 2867 *qos_control = 0; 2868 } else 2869 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2870 2871 skb_reset_mac_header(skb); 2872 2873 info = IEEE80211_SKB_CB(skb); 2874 memset(info, 0, sizeof(*info)); 2875 2876 info->flags = info_flags; 2877 info->ack_frame_id = info_id; 2878 info->band = band; 2879 info->control.flags = ctrl_flags; 2880 2881 return skb; 2882 free: 2883 kfree_skb(skb); 2884 return ERR_PTR(ret); 2885 } 2886 2887 /* 2888 * fast-xmit overview 2889 * 2890 * The core idea of this fast-xmit is to remove per-packet checks by checking 2891 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2892 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2893 * much less work can be done per packet. For example, fragmentation must be 2894 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2895 * in the code here. 2896 * 2897 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2898 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2899 * 2900 * The most difficult part of this is that when any of these assumptions 2901 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2902 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2903 * since the per-packet code no longer checks the conditions. This is reflected 2904 * by the calls to these functions throughout the rest of the code, and must be 2905 * maintained if any of the TX path checks change. 2906 */ 2907 2908 void ieee80211_check_fast_xmit(struct sta_info *sta) 2909 { 2910 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2911 struct ieee80211_local *local = sta->local; 2912 struct ieee80211_sub_if_data *sdata = sta->sdata; 2913 struct ieee80211_hdr *hdr = (void *)build.hdr; 2914 struct ieee80211_chanctx_conf *chanctx_conf; 2915 __le16 fc; 2916 2917 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2918 return; 2919 2920 /* Locking here protects both the pointer itself, and against concurrent 2921 * invocations winning data access races to, e.g., the key pointer that 2922 * is used. 2923 * Without it, the invocation of this function right after the key 2924 * pointer changes wouldn't be sufficient, as another CPU could access 2925 * the pointer, then stall, and then do the cache update after the CPU 2926 * that invalidated the key. 2927 * With the locking, such scenarios cannot happen as the check for the 2928 * key and the fast-tx assignment are done atomically, so the CPU that 2929 * modifies the key will either wait or other one will see the key 2930 * cleared/changed already. 2931 */ 2932 spin_lock_bh(&sta->lock); 2933 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2934 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2935 sdata->vif.type == NL80211_IFTYPE_STATION) 2936 goto out; 2937 2938 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2939 goto out; 2940 2941 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2942 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2943 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2944 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2945 goto out; 2946 2947 if (sdata->noack_map) 2948 goto out; 2949 2950 /* fast-xmit doesn't handle fragmentation at all */ 2951 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2952 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2953 goto out; 2954 2955 rcu_read_lock(); 2956 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2957 if (!chanctx_conf) { 2958 rcu_read_unlock(); 2959 goto out; 2960 } 2961 build.band = chanctx_conf->def.chan->band; 2962 rcu_read_unlock(); 2963 2964 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2965 2966 switch (sdata->vif.type) { 2967 case NL80211_IFTYPE_ADHOC: 2968 /* DA SA BSSID */ 2969 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2970 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2971 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2972 build.hdr_len = 24; 2973 break; 2974 case NL80211_IFTYPE_STATION: 2975 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2976 /* DA SA BSSID */ 2977 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2978 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2979 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2980 build.hdr_len = 24; 2981 break; 2982 } 2983 2984 if (sdata->u.mgd.use_4addr) { 2985 /* non-regular ethertype cannot use the fastpath */ 2986 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2987 IEEE80211_FCTL_TODS); 2988 /* RA TA DA SA */ 2989 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2990 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2991 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2992 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2993 build.hdr_len = 30; 2994 break; 2995 } 2996 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2997 /* BSSID SA DA */ 2998 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2999 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3000 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3001 build.hdr_len = 24; 3002 break; 3003 case NL80211_IFTYPE_AP_VLAN: 3004 if (sdata->wdev.use_4addr) { 3005 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3006 IEEE80211_FCTL_TODS); 3007 /* RA TA DA SA */ 3008 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3009 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3010 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3011 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3012 build.hdr_len = 30; 3013 break; 3014 } 3015 fallthrough; 3016 case NL80211_IFTYPE_AP: 3017 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3018 /* DA BSSID SA */ 3019 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3020 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3021 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3022 build.hdr_len = 24; 3023 break; 3024 default: 3025 /* not handled on fast-xmit */ 3026 goto out; 3027 } 3028 3029 if (sta->sta.wme) { 3030 build.hdr_len += 2; 3031 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3032 } 3033 3034 /* We store the key here so there's no point in using rcu_dereference() 3035 * but that's fine because the code that changes the pointers will call 3036 * this function after doing so. For a single CPU that would be enough, 3037 * for multiple see the comment above. 3038 */ 3039 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3040 if (!build.key) 3041 build.key = rcu_access_pointer(sdata->default_unicast_key); 3042 if (build.key) { 3043 bool gen_iv, iv_spc, mmic; 3044 3045 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3046 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3047 mmic = build.key->conf.flags & 3048 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3049 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3050 3051 /* don't handle software crypto */ 3052 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3053 goto out; 3054 3055 /* Key is being removed */ 3056 if (build.key->flags & KEY_FLAG_TAINTED) 3057 goto out; 3058 3059 switch (build.key->conf.cipher) { 3060 case WLAN_CIPHER_SUITE_CCMP: 3061 case WLAN_CIPHER_SUITE_CCMP_256: 3062 if (gen_iv) 3063 build.pn_offs = build.hdr_len; 3064 if (gen_iv || iv_spc) 3065 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3066 break; 3067 case WLAN_CIPHER_SUITE_GCMP: 3068 case WLAN_CIPHER_SUITE_GCMP_256: 3069 if (gen_iv) 3070 build.pn_offs = build.hdr_len; 3071 if (gen_iv || iv_spc) 3072 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3073 break; 3074 case WLAN_CIPHER_SUITE_TKIP: 3075 /* cannot handle MMIC or IV generation in xmit-fast */ 3076 if (mmic || gen_iv) 3077 goto out; 3078 if (iv_spc) 3079 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3080 break; 3081 case WLAN_CIPHER_SUITE_WEP40: 3082 case WLAN_CIPHER_SUITE_WEP104: 3083 /* cannot handle IV generation in fast-xmit */ 3084 if (gen_iv) 3085 goto out; 3086 if (iv_spc) 3087 build.hdr_len += IEEE80211_WEP_IV_LEN; 3088 break; 3089 case WLAN_CIPHER_SUITE_AES_CMAC: 3090 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3091 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3092 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3093 WARN(1, 3094 "management cipher suite 0x%x enabled for data\n", 3095 build.key->conf.cipher); 3096 goto out; 3097 default: 3098 /* we don't know how to generate IVs for this at all */ 3099 if (WARN_ON(gen_iv)) 3100 goto out; 3101 /* pure hardware keys are OK, of course */ 3102 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3103 break; 3104 /* cipher scheme might require space allocation */ 3105 if (iv_spc && 3106 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3107 goto out; 3108 if (iv_spc) 3109 build.hdr_len += build.key->conf.iv_len; 3110 } 3111 3112 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3113 } 3114 3115 hdr->frame_control = fc; 3116 3117 memcpy(build.hdr + build.hdr_len, 3118 rfc1042_header, sizeof(rfc1042_header)); 3119 build.hdr_len += sizeof(rfc1042_header); 3120 3121 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3122 /* if the kmemdup fails, continue w/o fast_tx */ 3123 if (!fast_tx) 3124 goto out; 3125 3126 out: 3127 /* we might have raced against another call to this function */ 3128 old = rcu_dereference_protected(sta->fast_tx, 3129 lockdep_is_held(&sta->lock)); 3130 rcu_assign_pointer(sta->fast_tx, fast_tx); 3131 if (old) 3132 kfree_rcu(old, rcu_head); 3133 spin_unlock_bh(&sta->lock); 3134 } 3135 3136 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3137 { 3138 struct sta_info *sta; 3139 3140 rcu_read_lock(); 3141 list_for_each_entry_rcu(sta, &local->sta_list, list) 3142 ieee80211_check_fast_xmit(sta); 3143 rcu_read_unlock(); 3144 } 3145 3146 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3147 { 3148 struct ieee80211_local *local = sdata->local; 3149 struct sta_info *sta; 3150 3151 rcu_read_lock(); 3152 3153 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3154 if (sdata != sta->sdata && 3155 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3156 continue; 3157 ieee80211_check_fast_xmit(sta); 3158 } 3159 3160 rcu_read_unlock(); 3161 } 3162 3163 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3164 { 3165 struct ieee80211_fast_tx *fast_tx; 3166 3167 spin_lock_bh(&sta->lock); 3168 fast_tx = rcu_dereference_protected(sta->fast_tx, 3169 lockdep_is_held(&sta->lock)); 3170 RCU_INIT_POINTER(sta->fast_tx, NULL); 3171 spin_unlock_bh(&sta->lock); 3172 3173 if (fast_tx) 3174 kfree_rcu(fast_tx, rcu_head); 3175 } 3176 3177 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3178 struct sk_buff *skb, int headroom) 3179 { 3180 if (skb_headroom(skb) < headroom) { 3181 I802_DEBUG_INC(local->tx_expand_skb_head); 3182 3183 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3184 wiphy_debug(local->hw.wiphy, 3185 "failed to reallocate TX buffer\n"); 3186 return false; 3187 } 3188 } 3189 3190 return true; 3191 } 3192 3193 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3194 struct ieee80211_fast_tx *fast_tx, 3195 struct sk_buff *skb) 3196 { 3197 struct ieee80211_local *local = sdata->local; 3198 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3199 struct ieee80211_hdr *hdr; 3200 struct ethhdr *amsdu_hdr; 3201 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3202 int subframe_len = skb->len - hdr_len; 3203 void *data; 3204 u8 *qc, *h_80211_src, *h_80211_dst; 3205 const u8 *bssid; 3206 3207 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3208 return false; 3209 3210 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3211 return true; 3212 3213 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3214 return false; 3215 3216 data = skb_push(skb, sizeof(*amsdu_hdr)); 3217 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3218 hdr = data; 3219 amsdu_hdr = data + hdr_len; 3220 /* h_80211_src/dst is addr* field within hdr */ 3221 h_80211_src = data + fast_tx->sa_offs; 3222 h_80211_dst = data + fast_tx->da_offs; 3223 3224 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3225 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3226 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3227 3228 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3229 * fields needs to be changed to BSSID for A-MSDU frames depending 3230 * on FromDS/ToDS values. 3231 */ 3232 switch (sdata->vif.type) { 3233 case NL80211_IFTYPE_STATION: 3234 bssid = sdata->u.mgd.bssid; 3235 break; 3236 case NL80211_IFTYPE_AP: 3237 case NL80211_IFTYPE_AP_VLAN: 3238 bssid = sdata->vif.addr; 3239 break; 3240 default: 3241 bssid = NULL; 3242 } 3243 3244 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3245 ether_addr_copy(h_80211_src, bssid); 3246 3247 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3248 ether_addr_copy(h_80211_dst, bssid); 3249 3250 qc = ieee80211_get_qos_ctl(hdr); 3251 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3252 3253 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3254 3255 return true; 3256 } 3257 3258 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3259 struct sta_info *sta, 3260 struct ieee80211_fast_tx *fast_tx, 3261 struct sk_buff *skb) 3262 { 3263 struct ieee80211_local *local = sdata->local; 3264 struct fq *fq = &local->fq; 3265 struct fq_tin *tin; 3266 struct fq_flow *flow; 3267 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3268 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3269 struct txq_info *txqi; 3270 struct sk_buff **frag_tail, *head; 3271 int subframe_len = skb->len - ETH_ALEN; 3272 u8 max_subframes = sta->sta.max_amsdu_subframes; 3273 int max_frags = local->hw.max_tx_fragments; 3274 int max_amsdu_len = sta->sta.max_amsdu_len; 3275 int orig_truesize; 3276 u32 flow_idx; 3277 __be16 len; 3278 void *data; 3279 bool ret = false; 3280 unsigned int orig_len; 3281 int n = 2, nfrags, pad = 0; 3282 u16 hdrlen; 3283 3284 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3285 return false; 3286 3287 if (skb_is_gso(skb)) 3288 return false; 3289 3290 if (!txq) 3291 return false; 3292 3293 txqi = to_txq_info(txq); 3294 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3295 return false; 3296 3297 if (sta->sta.max_rc_amsdu_len) 3298 max_amsdu_len = min_t(int, max_amsdu_len, 3299 sta->sta.max_rc_amsdu_len); 3300 3301 if (sta->sta.max_tid_amsdu_len[tid]) 3302 max_amsdu_len = min_t(int, max_amsdu_len, 3303 sta->sta.max_tid_amsdu_len[tid]); 3304 3305 flow_idx = fq_flow_idx(fq, skb); 3306 3307 spin_lock_bh(&fq->lock); 3308 3309 /* TODO: Ideally aggregation should be done on dequeue to remain 3310 * responsive to environment changes. 3311 */ 3312 3313 tin = &txqi->tin; 3314 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3315 head = skb_peek_tail(&flow->queue); 3316 if (!head || skb_is_gso(head)) 3317 goto out; 3318 3319 orig_truesize = head->truesize; 3320 orig_len = head->len; 3321 3322 if (skb->len + head->len > max_amsdu_len) 3323 goto out; 3324 3325 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3326 nfrags += 1 + skb_shinfo(head)->nr_frags; 3327 frag_tail = &skb_shinfo(head)->frag_list; 3328 while (*frag_tail) { 3329 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3330 frag_tail = &(*frag_tail)->next; 3331 n++; 3332 } 3333 3334 if (max_subframes && n > max_subframes) 3335 goto out; 3336 3337 if (max_frags && nfrags > max_frags) 3338 goto out; 3339 3340 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3341 goto out; 3342 3343 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3344 goto out; 3345 3346 /* 3347 * Pad out the previous subframe to a multiple of 4 by adding the 3348 * padding to the next one, that's being added. Note that head->len 3349 * is the length of the full A-MSDU, but that works since each time 3350 * we add a new subframe we pad out the previous one to a multiple 3351 * of 4 and thus it no longer matters in the next round. 3352 */ 3353 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3354 if ((head->len - hdrlen) & 3) 3355 pad = 4 - ((head->len - hdrlen) & 3); 3356 3357 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3358 2 + pad)) 3359 goto out_recalc; 3360 3361 ret = true; 3362 data = skb_push(skb, ETH_ALEN + 2); 3363 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3364 3365 data += 2 * ETH_ALEN; 3366 len = cpu_to_be16(subframe_len); 3367 memcpy(data, &len, 2); 3368 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3369 3370 memset(skb_push(skb, pad), 0, pad); 3371 3372 head->len += skb->len; 3373 head->data_len += skb->len; 3374 *frag_tail = skb; 3375 3376 out_recalc: 3377 fq->memory_usage += head->truesize - orig_truesize; 3378 if (head->len != orig_len) { 3379 flow->backlog += head->len - orig_len; 3380 tin->backlog_bytes += head->len - orig_len; 3381 } 3382 out: 3383 spin_unlock_bh(&fq->lock); 3384 3385 return ret; 3386 } 3387 3388 /* 3389 * Can be called while the sta lock is held. Anything that can cause packets to 3390 * be generated will cause deadlock! 3391 */ 3392 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3393 struct sta_info *sta, u8 pn_offs, 3394 struct ieee80211_key *key, 3395 struct sk_buff *skb) 3396 { 3397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3398 struct ieee80211_hdr *hdr = (void *)skb->data; 3399 u8 tid = IEEE80211_NUM_TIDS; 3400 3401 if (key) 3402 info->control.hw_key = &key->conf; 3403 3404 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3405 3406 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3407 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3408 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3409 } else { 3410 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3411 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3412 sdata->sequence_number += 0x10; 3413 } 3414 3415 if (skb_shinfo(skb)->gso_size) 3416 sta->tx_stats.msdu[tid] += 3417 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3418 else 3419 sta->tx_stats.msdu[tid]++; 3420 3421 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3422 3423 /* statistics normally done by ieee80211_tx_h_stats (but that 3424 * has to consider fragmentation, so is more complex) 3425 */ 3426 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3427 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3428 3429 if (pn_offs) { 3430 u64 pn; 3431 u8 *crypto_hdr = skb->data + pn_offs; 3432 3433 switch (key->conf.cipher) { 3434 case WLAN_CIPHER_SUITE_CCMP: 3435 case WLAN_CIPHER_SUITE_CCMP_256: 3436 case WLAN_CIPHER_SUITE_GCMP: 3437 case WLAN_CIPHER_SUITE_GCMP_256: 3438 pn = atomic64_inc_return(&key->conf.tx_pn); 3439 crypto_hdr[0] = pn; 3440 crypto_hdr[1] = pn >> 8; 3441 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3442 crypto_hdr[4] = pn >> 16; 3443 crypto_hdr[5] = pn >> 24; 3444 crypto_hdr[6] = pn >> 32; 3445 crypto_hdr[7] = pn >> 40; 3446 break; 3447 } 3448 } 3449 } 3450 3451 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3452 struct sta_info *sta, 3453 struct ieee80211_fast_tx *fast_tx, 3454 struct sk_buff *skb) 3455 { 3456 struct ieee80211_local *local = sdata->local; 3457 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3458 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3459 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3460 struct ethhdr eth; 3461 struct ieee80211_tx_info *info; 3462 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3463 struct ieee80211_tx_data tx; 3464 ieee80211_tx_result r; 3465 struct tid_ampdu_tx *tid_tx = NULL; 3466 u8 tid = IEEE80211_NUM_TIDS; 3467 3468 /* control port protocol needs a lot of special handling */ 3469 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3470 return false; 3471 3472 /* only RFC 1042 SNAP */ 3473 if (ethertype < ETH_P_802_3_MIN) 3474 return false; 3475 3476 /* don't handle TX status request here either */ 3477 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3478 return false; 3479 3480 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3481 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3482 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3483 if (tid_tx) { 3484 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3485 return false; 3486 if (tid_tx->timeout) 3487 tid_tx->last_tx = jiffies; 3488 } 3489 } 3490 3491 /* after this point (skb is modified) we cannot return false */ 3492 3493 if (skb_shared(skb)) { 3494 struct sk_buff *tmp_skb = skb; 3495 3496 skb = skb_clone(skb, GFP_ATOMIC); 3497 kfree_skb(tmp_skb); 3498 3499 if (!skb) 3500 return true; 3501 } 3502 3503 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3504 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3505 return true; 3506 3507 /* will not be crypto-handled beyond what we do here, so use false 3508 * as the may-encrypt argument for the resize to not account for 3509 * more room than we already have in 'extra_head' 3510 */ 3511 if (unlikely(ieee80211_skb_resize(sdata, skb, 3512 max_t(int, extra_head + hw_headroom - 3513 skb_headroom(skb), 0), 3514 ENCRYPT_NO))) { 3515 kfree_skb(skb); 3516 return true; 3517 } 3518 3519 memcpy(ð, skb->data, ETH_HLEN - 2); 3520 hdr = skb_push(skb, extra_head); 3521 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3522 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3523 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3524 3525 info = IEEE80211_SKB_CB(skb); 3526 memset(info, 0, sizeof(*info)); 3527 info->band = fast_tx->band; 3528 info->control.vif = &sdata->vif; 3529 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3530 IEEE80211_TX_CTL_DONTFRAG | 3531 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3532 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3533 3534 #ifdef CONFIG_MAC80211_DEBUGFS 3535 if (local->force_tx_status) 3536 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3537 #endif 3538 3539 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3540 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3541 *ieee80211_get_qos_ctl(hdr) = tid; 3542 } 3543 3544 __skb_queue_head_init(&tx.skbs); 3545 3546 tx.flags = IEEE80211_TX_UNICAST; 3547 tx.local = local; 3548 tx.sdata = sdata; 3549 tx.sta = sta; 3550 tx.key = fast_tx->key; 3551 3552 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3553 tx.skb = skb; 3554 r = ieee80211_tx_h_rate_ctrl(&tx); 3555 skb = tx.skb; 3556 tx.skb = NULL; 3557 3558 if (r != TX_CONTINUE) { 3559 if (r != TX_QUEUED) 3560 kfree_skb(skb); 3561 return true; 3562 } 3563 } 3564 3565 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3566 return true; 3567 3568 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3569 fast_tx->key, skb); 3570 3571 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3572 sdata = container_of(sdata->bss, 3573 struct ieee80211_sub_if_data, u.ap); 3574 3575 __skb_queue_tail(&tx.skbs, skb); 3576 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3577 return true; 3578 } 3579 3580 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3581 struct ieee80211_txq *txq) 3582 { 3583 struct ieee80211_local *local = hw_to_local(hw); 3584 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3585 struct ieee80211_hdr *hdr; 3586 struct sk_buff *skb = NULL; 3587 struct fq *fq = &local->fq; 3588 struct fq_tin *tin = &txqi->tin; 3589 struct ieee80211_tx_info *info; 3590 struct ieee80211_tx_data tx; 3591 ieee80211_tx_result r; 3592 struct ieee80211_vif *vif = txq->vif; 3593 3594 WARN_ON_ONCE(softirq_count() == 0); 3595 3596 if (!ieee80211_txq_airtime_check(hw, txq)) 3597 return NULL; 3598 3599 begin: 3600 spin_lock_bh(&fq->lock); 3601 3602 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3603 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3604 goto out; 3605 3606 if (vif->txqs_stopped[txq->ac]) { 3607 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3608 goto out; 3609 } 3610 3611 /* Make sure fragments stay together. */ 3612 skb = __skb_dequeue(&txqi->frags); 3613 if (unlikely(skb)) { 3614 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3615 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3616 goto out; 3617 IEEE80211_SKB_CB(skb)->control.flags &= 3618 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3619 } else { 3620 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3621 } 3622 3623 if (!skb) 3624 goto out; 3625 3626 spin_unlock_bh(&fq->lock); 3627 3628 hdr = (struct ieee80211_hdr *)skb->data; 3629 info = IEEE80211_SKB_CB(skb); 3630 3631 memset(&tx, 0, sizeof(tx)); 3632 __skb_queue_head_init(&tx.skbs); 3633 tx.local = local; 3634 tx.skb = skb; 3635 tx.sdata = vif_to_sdata(info->control.vif); 3636 3637 if (txq->sta) { 3638 tx.sta = container_of(txq->sta, struct sta_info, sta); 3639 /* 3640 * Drop unicast frames to unauthorised stations unless they are 3641 * injected frames or EAPOL frames from the local station. 3642 */ 3643 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3644 ieee80211_is_data(hdr->frame_control) && 3645 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3646 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3647 !is_multicast_ether_addr(hdr->addr1) && 3648 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3649 (!(info->control.flags & 3650 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3651 !ether_addr_equal(tx.sdata->vif.addr, 3652 hdr->addr2)))) { 3653 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3654 ieee80211_free_txskb(&local->hw, skb); 3655 goto begin; 3656 } 3657 } 3658 3659 /* 3660 * The key can be removed while the packet was queued, so need to call 3661 * this here to get the current key. 3662 */ 3663 r = ieee80211_tx_h_select_key(&tx); 3664 if (r != TX_CONTINUE) { 3665 ieee80211_free_txskb(&local->hw, skb); 3666 goto begin; 3667 } 3668 3669 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3670 info->flags |= IEEE80211_TX_CTL_AMPDU; 3671 else 3672 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3673 3674 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 3675 goto encap_out; 3676 3677 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3678 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3679 sta); 3680 u8 pn_offs = 0; 3681 3682 if (tx.key && 3683 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3684 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3685 3686 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3687 tx.key, skb); 3688 } else { 3689 if (invoke_tx_handlers_late(&tx)) 3690 goto begin; 3691 3692 skb = __skb_dequeue(&tx.skbs); 3693 3694 if (!skb_queue_empty(&tx.skbs)) { 3695 spin_lock_bh(&fq->lock); 3696 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3697 spin_unlock_bh(&fq->lock); 3698 } 3699 } 3700 3701 if (skb_has_frag_list(skb) && 3702 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3703 if (skb_linearize(skb)) { 3704 ieee80211_free_txskb(&local->hw, skb); 3705 goto begin; 3706 } 3707 } 3708 3709 switch (tx.sdata->vif.type) { 3710 case NL80211_IFTYPE_MONITOR: 3711 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3712 vif = &tx.sdata->vif; 3713 break; 3714 } 3715 tx.sdata = rcu_dereference(local->monitor_sdata); 3716 if (tx.sdata) { 3717 vif = &tx.sdata->vif; 3718 info->hw_queue = 3719 vif->hw_queue[skb_get_queue_mapping(skb)]; 3720 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3721 ieee80211_free_txskb(&local->hw, skb); 3722 goto begin; 3723 } else { 3724 vif = NULL; 3725 } 3726 break; 3727 case NL80211_IFTYPE_AP_VLAN: 3728 tx.sdata = container_of(tx.sdata->bss, 3729 struct ieee80211_sub_if_data, u.ap); 3730 fallthrough; 3731 default: 3732 vif = &tx.sdata->vif; 3733 break; 3734 } 3735 3736 encap_out: 3737 IEEE80211_SKB_CB(skb)->control.vif = vif; 3738 3739 if (vif && 3740 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3741 bool ampdu = txq->ac != IEEE80211_AC_VO; 3742 u32 airtime; 3743 3744 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3745 skb->len, ampdu); 3746 if (airtime) { 3747 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3748 ieee80211_sta_update_pending_airtime(local, tx.sta, 3749 txq->ac, 3750 airtime, 3751 false); 3752 } 3753 } 3754 3755 return skb; 3756 3757 out: 3758 spin_unlock_bh(&fq->lock); 3759 3760 return skb; 3761 } 3762 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3763 3764 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3765 { 3766 struct ieee80211_local *local = hw_to_local(hw); 3767 struct ieee80211_txq *ret = NULL; 3768 struct txq_info *txqi = NULL, *head = NULL; 3769 bool found_eligible_txq = false; 3770 3771 spin_lock_bh(&local->active_txq_lock[ac]); 3772 3773 begin: 3774 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3775 struct txq_info, 3776 schedule_order); 3777 if (!txqi) 3778 goto out; 3779 3780 if (txqi == head) { 3781 if (!found_eligible_txq) 3782 goto out; 3783 else 3784 found_eligible_txq = false; 3785 } 3786 3787 if (!head) 3788 head = txqi; 3789 3790 if (txqi->txq.sta) { 3791 struct sta_info *sta = container_of(txqi->txq.sta, 3792 struct sta_info, sta); 3793 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3794 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3795 3796 if (aql_check) 3797 found_eligible_txq = true; 3798 3799 if (deficit < 0) 3800 sta->airtime[txqi->txq.ac].deficit += 3801 sta->airtime_weight; 3802 3803 if (deficit < 0 || !aql_check) { 3804 list_move_tail(&txqi->schedule_order, 3805 &local->active_txqs[txqi->txq.ac]); 3806 goto begin; 3807 } 3808 } 3809 3810 3811 if (txqi->schedule_round == local->schedule_round[ac]) 3812 goto out; 3813 3814 list_del_init(&txqi->schedule_order); 3815 txqi->schedule_round = local->schedule_round[ac]; 3816 ret = &txqi->txq; 3817 3818 out: 3819 spin_unlock_bh(&local->active_txq_lock[ac]); 3820 return ret; 3821 } 3822 EXPORT_SYMBOL(ieee80211_next_txq); 3823 3824 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3825 struct ieee80211_txq *txq, 3826 bool force) 3827 { 3828 struct ieee80211_local *local = hw_to_local(hw); 3829 struct txq_info *txqi = to_txq_info(txq); 3830 3831 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3832 3833 if (list_empty(&txqi->schedule_order) && 3834 (force || !skb_queue_empty(&txqi->frags) || 3835 txqi->tin.backlog_packets)) { 3836 /* If airtime accounting is active, always enqueue STAs at the 3837 * head of the list to ensure that they only get moved to the 3838 * back by the airtime DRR scheduler once they have a negative 3839 * deficit. A station that already has a negative deficit will 3840 * get immediately moved to the back of the list on the next 3841 * call to ieee80211_next_txq(). 3842 */ 3843 if (txqi->txq.sta && local->airtime_flags && 3844 wiphy_ext_feature_isset(local->hw.wiphy, 3845 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3846 list_add(&txqi->schedule_order, 3847 &local->active_txqs[txq->ac]); 3848 else 3849 list_add_tail(&txqi->schedule_order, 3850 &local->active_txqs[txq->ac]); 3851 } 3852 3853 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3854 } 3855 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3856 3857 DEFINE_STATIC_KEY_FALSE(aql_disable); 3858 3859 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3860 struct ieee80211_txq *txq) 3861 { 3862 struct sta_info *sta; 3863 struct ieee80211_local *local = hw_to_local(hw); 3864 3865 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3866 return true; 3867 3868 if (static_branch_unlikely(&aql_disable)) 3869 return true; 3870 3871 if (!txq->sta) 3872 return true; 3873 3874 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 3875 return true; 3876 3877 sta = container_of(txq->sta, struct sta_info, sta); 3878 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3879 sta->airtime[txq->ac].aql_limit_low) 3880 return true; 3881 3882 if (atomic_read(&local->aql_total_pending_airtime) < 3883 local->aql_threshold && 3884 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3885 sta->airtime[txq->ac].aql_limit_high) 3886 return true; 3887 3888 return false; 3889 } 3890 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3891 3892 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3893 struct ieee80211_txq *txq) 3894 { 3895 struct ieee80211_local *local = hw_to_local(hw); 3896 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3897 struct sta_info *sta; 3898 u8 ac = txq->ac; 3899 3900 spin_lock_bh(&local->active_txq_lock[ac]); 3901 3902 if (!txqi->txq.sta) 3903 goto out; 3904 3905 if (list_empty(&txqi->schedule_order)) 3906 goto out; 3907 3908 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3909 schedule_order) { 3910 if (iter == txqi) 3911 break; 3912 3913 if (!iter->txq.sta) { 3914 list_move_tail(&iter->schedule_order, 3915 &local->active_txqs[ac]); 3916 continue; 3917 } 3918 sta = container_of(iter->txq.sta, struct sta_info, sta); 3919 if (sta->airtime[ac].deficit < 0) 3920 sta->airtime[ac].deficit += sta->airtime_weight; 3921 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3922 } 3923 3924 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3925 if (sta->airtime[ac].deficit >= 0) 3926 goto out; 3927 3928 sta->airtime[ac].deficit += sta->airtime_weight; 3929 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3930 spin_unlock_bh(&local->active_txq_lock[ac]); 3931 3932 return false; 3933 out: 3934 if (!list_empty(&txqi->schedule_order)) 3935 list_del_init(&txqi->schedule_order); 3936 spin_unlock_bh(&local->active_txq_lock[ac]); 3937 3938 return true; 3939 } 3940 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3941 3942 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3943 { 3944 struct ieee80211_local *local = hw_to_local(hw); 3945 3946 spin_lock_bh(&local->active_txq_lock[ac]); 3947 local->schedule_round[ac]++; 3948 spin_unlock_bh(&local->active_txq_lock[ac]); 3949 } 3950 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3951 3952 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3953 struct net_device *dev, 3954 u32 info_flags, 3955 u32 ctrl_flags, 3956 u64 *cookie) 3957 { 3958 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3959 struct ieee80211_local *local = sdata->local; 3960 struct sta_info *sta; 3961 struct sk_buff *next; 3962 3963 if (unlikely(skb->len < ETH_HLEN)) { 3964 kfree_skb(skb); 3965 return; 3966 } 3967 3968 rcu_read_lock(); 3969 3970 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3971 goto out_free; 3972 3973 if (IS_ERR(sta)) 3974 sta = NULL; 3975 3976 if (local->ops->wake_tx_queue) { 3977 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3978 skb_set_queue_mapping(skb, queue); 3979 skb_get_hash(skb); 3980 } 3981 3982 if (sta) { 3983 struct ieee80211_fast_tx *fast_tx; 3984 3985 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3986 3987 fast_tx = rcu_dereference(sta->fast_tx); 3988 3989 if (fast_tx && 3990 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3991 goto out; 3992 } 3993 3994 if (skb_is_gso(skb)) { 3995 struct sk_buff *segs; 3996 3997 segs = skb_gso_segment(skb, 0); 3998 if (IS_ERR(segs)) { 3999 goto out_free; 4000 } else if (segs) { 4001 consume_skb(skb); 4002 skb = segs; 4003 } 4004 } else { 4005 /* we cannot process non-linear frames on this path */ 4006 if (skb_linearize(skb)) { 4007 kfree_skb(skb); 4008 goto out; 4009 } 4010 4011 /* the frame could be fragmented, software-encrypted, and other 4012 * things so we cannot really handle checksum offload with it - 4013 * fix it up in software before we handle anything else. 4014 */ 4015 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4016 skb_set_transport_header(skb, 4017 skb_checksum_start_offset(skb)); 4018 if (skb_checksum_help(skb)) 4019 goto out_free; 4020 } 4021 } 4022 4023 skb_list_walk_safe(skb, skb, next) { 4024 skb_mark_not_on_list(skb); 4025 4026 if (skb->protocol == sdata->control_port_protocol) 4027 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4028 4029 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4030 sta, ctrl_flags, cookie); 4031 if (IS_ERR(skb)) { 4032 kfree_skb_list(next); 4033 goto out; 4034 } 4035 4036 dev_sw_netstats_tx_add(dev, 1, skb->len); 4037 4038 ieee80211_xmit(sdata, sta, skb); 4039 } 4040 goto out; 4041 out_free: 4042 kfree_skb(skb); 4043 out: 4044 rcu_read_unlock(); 4045 } 4046 4047 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4048 { 4049 struct ethhdr *eth; 4050 int err; 4051 4052 err = skb_ensure_writable(skb, ETH_HLEN); 4053 if (unlikely(err)) 4054 return err; 4055 4056 eth = (void *)skb->data; 4057 ether_addr_copy(eth->h_dest, sta->sta.addr); 4058 4059 return 0; 4060 } 4061 4062 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4063 struct net_device *dev) 4064 { 4065 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4066 const struct ethhdr *eth = (void *)skb->data; 4067 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4068 __be16 ethertype; 4069 4070 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4071 return false; 4072 4073 switch (sdata->vif.type) { 4074 case NL80211_IFTYPE_AP_VLAN: 4075 if (sdata->u.vlan.sta) 4076 return false; 4077 if (sdata->wdev.use_4addr) 4078 return false; 4079 fallthrough; 4080 case NL80211_IFTYPE_AP: 4081 /* check runtime toggle for this bss */ 4082 if (!sdata->bss->multicast_to_unicast) 4083 return false; 4084 break; 4085 default: 4086 return false; 4087 } 4088 4089 /* multicast to unicast conversion only for some payload */ 4090 ethertype = eth->h_proto; 4091 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4092 ethertype = ethvlan->h_vlan_encapsulated_proto; 4093 switch (ethertype) { 4094 case htons(ETH_P_ARP): 4095 case htons(ETH_P_IP): 4096 case htons(ETH_P_IPV6): 4097 break; 4098 default: 4099 return false; 4100 } 4101 4102 return true; 4103 } 4104 4105 static void 4106 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4107 struct sk_buff_head *queue) 4108 { 4109 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4110 struct ieee80211_local *local = sdata->local; 4111 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4112 struct sta_info *sta, *first = NULL; 4113 struct sk_buff *cloned_skb; 4114 4115 rcu_read_lock(); 4116 4117 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4118 if (sdata != sta->sdata) 4119 /* AP-VLAN mismatch */ 4120 continue; 4121 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4122 /* do not send back to source */ 4123 continue; 4124 if (!first) { 4125 first = sta; 4126 continue; 4127 } 4128 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4129 if (!cloned_skb) 4130 goto multicast; 4131 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4132 dev_kfree_skb(cloned_skb); 4133 goto multicast; 4134 } 4135 __skb_queue_tail(queue, cloned_skb); 4136 } 4137 4138 if (likely(first)) { 4139 if (unlikely(ieee80211_change_da(skb, first))) 4140 goto multicast; 4141 __skb_queue_tail(queue, skb); 4142 } else { 4143 /* no STA connected, drop */ 4144 kfree_skb(skb); 4145 skb = NULL; 4146 } 4147 4148 goto out; 4149 multicast: 4150 __skb_queue_purge(queue); 4151 __skb_queue_tail(queue, skb); 4152 out: 4153 rcu_read_unlock(); 4154 } 4155 4156 /** 4157 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4158 * @skb: packet to be sent 4159 * @dev: incoming interface 4160 * 4161 * On failure skb will be freed. 4162 */ 4163 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4164 struct net_device *dev) 4165 { 4166 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4167 struct sk_buff_head queue; 4168 4169 __skb_queue_head_init(&queue); 4170 ieee80211_convert_to_unicast(skb, dev, &queue); 4171 while ((skb = __skb_dequeue(&queue))) 4172 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4173 } else { 4174 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4175 } 4176 4177 return NETDEV_TX_OK; 4178 } 4179 4180 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4181 struct sk_buff *skb, int led_len, 4182 struct sta_info *sta, 4183 bool txpending) 4184 { 4185 struct ieee80211_local *local = sdata->local; 4186 struct ieee80211_tx_control control = {}; 4187 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4188 struct ieee80211_sta *pubsta = NULL; 4189 unsigned long flags; 4190 int q = info->hw_queue; 4191 4192 if (sta) 4193 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4194 4195 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4196 return true; 4197 4198 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4199 4200 if (local->queue_stop_reasons[q] || 4201 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4202 if (txpending) 4203 skb_queue_head(&local->pending[q], skb); 4204 else 4205 skb_queue_tail(&local->pending[q], skb); 4206 4207 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4208 4209 return false; 4210 } 4211 4212 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4213 4214 if (sta && sta->uploaded) 4215 pubsta = &sta->sta; 4216 4217 control.sta = pubsta; 4218 4219 drv_tx(local, &control, skb); 4220 4221 return true; 4222 } 4223 4224 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4225 struct net_device *dev, struct sta_info *sta, 4226 struct ieee80211_key *key, struct sk_buff *skb) 4227 { 4228 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4229 struct ieee80211_local *local = sdata->local; 4230 struct tid_ampdu_tx *tid_tx; 4231 u8 tid; 4232 4233 if (local->ops->wake_tx_queue) { 4234 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4235 skb_set_queue_mapping(skb, queue); 4236 skb_get_hash(skb); 4237 } 4238 4239 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4240 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4241 goto out_free; 4242 4243 memset(info, 0, sizeof(*info)); 4244 4245 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4246 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4247 if (tid_tx) { 4248 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4249 /* fall back to non-offload slow path */ 4250 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4251 return; 4252 } 4253 4254 info->flags |= IEEE80211_TX_CTL_AMPDU; 4255 if (tid_tx->timeout) 4256 tid_tx->last_tx = jiffies; 4257 } 4258 4259 if (unlikely(skb->sk && 4260 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4261 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4262 &info->flags, NULL); 4263 4264 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4265 4266 dev_sw_netstats_tx_add(dev, 1, skb->len); 4267 4268 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4269 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4270 4271 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4272 sdata = container_of(sdata->bss, 4273 struct ieee80211_sub_if_data, u.ap); 4274 4275 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4276 info->control.vif = &sdata->vif; 4277 4278 if (key) 4279 info->control.hw_key = &key->conf; 4280 4281 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4282 4283 return; 4284 4285 out_free: 4286 kfree_skb(skb); 4287 } 4288 4289 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4290 struct net_device *dev) 4291 { 4292 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4293 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4294 struct ieee80211_key *key; 4295 struct sta_info *sta; 4296 4297 if (unlikely(skb->len < ETH_HLEN)) { 4298 kfree_skb(skb); 4299 return NETDEV_TX_OK; 4300 } 4301 4302 rcu_read_lock(); 4303 4304 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4305 kfree_skb(skb); 4306 goto out; 4307 } 4308 4309 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4310 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4311 sdata->control_port_protocol == ehdr->h_proto)) 4312 goto skip_offload; 4313 4314 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4315 if (!key) 4316 key = rcu_dereference(sdata->default_unicast_key); 4317 4318 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4319 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4320 goto skip_offload; 4321 4322 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4323 goto out; 4324 4325 skip_offload: 4326 ieee80211_subif_start_xmit(skb, dev); 4327 out: 4328 rcu_read_unlock(); 4329 4330 return NETDEV_TX_OK; 4331 } 4332 4333 struct sk_buff * 4334 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4335 struct sk_buff *skb, u32 info_flags) 4336 { 4337 struct ieee80211_hdr *hdr; 4338 struct ieee80211_tx_data tx = { 4339 .local = sdata->local, 4340 .sdata = sdata, 4341 }; 4342 struct sta_info *sta; 4343 4344 rcu_read_lock(); 4345 4346 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4347 kfree_skb(skb); 4348 skb = ERR_PTR(-EINVAL); 4349 goto out; 4350 } 4351 4352 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4353 if (IS_ERR(skb)) 4354 goto out; 4355 4356 hdr = (void *)skb->data; 4357 tx.sta = sta_info_get(sdata, hdr->addr1); 4358 tx.skb = skb; 4359 4360 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4361 rcu_read_unlock(); 4362 kfree_skb(skb); 4363 return ERR_PTR(-EINVAL); 4364 } 4365 4366 out: 4367 rcu_read_unlock(); 4368 return skb; 4369 } 4370 4371 /* 4372 * ieee80211_clear_tx_pending may not be called in a context where 4373 * it is possible that it packets could come in again. 4374 */ 4375 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4376 { 4377 struct sk_buff *skb; 4378 int i; 4379 4380 for (i = 0; i < local->hw.queues; i++) { 4381 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4382 ieee80211_free_txskb(&local->hw, skb); 4383 } 4384 } 4385 4386 /* 4387 * Returns false if the frame couldn't be transmitted but was queued instead, 4388 * which in this case means re-queued -- take as an indication to stop sending 4389 * more pending frames. 4390 */ 4391 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4392 struct sk_buff *skb) 4393 { 4394 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4395 struct ieee80211_sub_if_data *sdata; 4396 struct sta_info *sta; 4397 struct ieee80211_hdr *hdr; 4398 bool result; 4399 struct ieee80211_chanctx_conf *chanctx_conf; 4400 4401 sdata = vif_to_sdata(info->control.vif); 4402 4403 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4404 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4405 if (unlikely(!chanctx_conf)) { 4406 dev_kfree_skb(skb); 4407 return true; 4408 } 4409 info->band = chanctx_conf->def.chan->band; 4410 result = ieee80211_tx(sdata, NULL, skb, true); 4411 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4412 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4413 dev_kfree_skb(skb); 4414 return true; 4415 } 4416 4417 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4418 sta = NULL; 4419 4420 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4421 } else { 4422 struct sk_buff_head skbs; 4423 4424 __skb_queue_head_init(&skbs); 4425 __skb_queue_tail(&skbs, skb); 4426 4427 hdr = (struct ieee80211_hdr *)skb->data; 4428 sta = sta_info_get(sdata, hdr->addr1); 4429 4430 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4431 } 4432 4433 return result; 4434 } 4435 4436 /* 4437 * Transmit all pending packets. Called from tasklet. 4438 */ 4439 void ieee80211_tx_pending(struct tasklet_struct *t) 4440 { 4441 struct ieee80211_local *local = from_tasklet(local, t, 4442 tx_pending_tasklet); 4443 unsigned long flags; 4444 int i; 4445 bool txok; 4446 4447 rcu_read_lock(); 4448 4449 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4450 for (i = 0; i < local->hw.queues; i++) { 4451 /* 4452 * If queue is stopped by something other than due to pending 4453 * frames, or we have no pending frames, proceed to next queue. 4454 */ 4455 if (local->queue_stop_reasons[i] || 4456 skb_queue_empty(&local->pending[i])) 4457 continue; 4458 4459 while (!skb_queue_empty(&local->pending[i])) { 4460 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4461 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4462 4463 if (WARN_ON(!info->control.vif)) { 4464 ieee80211_free_txskb(&local->hw, skb); 4465 continue; 4466 } 4467 4468 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4469 flags); 4470 4471 txok = ieee80211_tx_pending_skb(local, skb); 4472 spin_lock_irqsave(&local->queue_stop_reason_lock, 4473 flags); 4474 if (!txok) 4475 break; 4476 } 4477 4478 if (skb_queue_empty(&local->pending[i])) 4479 ieee80211_propagate_queue_wake(local, i); 4480 } 4481 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4482 4483 rcu_read_unlock(); 4484 } 4485 4486 /* functions for drivers to get certain frames */ 4487 4488 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4489 struct ps_data *ps, struct sk_buff *skb, 4490 bool is_template) 4491 { 4492 u8 *pos, *tim; 4493 int aid0 = 0; 4494 int i, have_bits = 0, n1, n2; 4495 4496 /* Generate bitmap for TIM only if there are any STAs in power save 4497 * mode. */ 4498 if (atomic_read(&ps->num_sta_ps) > 0) 4499 /* in the hope that this is faster than 4500 * checking byte-for-byte */ 4501 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4502 IEEE80211_MAX_AID+1); 4503 if (!is_template) { 4504 if (ps->dtim_count == 0) 4505 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4506 else 4507 ps->dtim_count--; 4508 } 4509 4510 tim = pos = skb_put(skb, 6); 4511 *pos++ = WLAN_EID_TIM; 4512 *pos++ = 4; 4513 *pos++ = ps->dtim_count; 4514 *pos++ = sdata->vif.bss_conf.dtim_period; 4515 4516 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4517 aid0 = 1; 4518 4519 ps->dtim_bc_mc = aid0 == 1; 4520 4521 if (have_bits) { 4522 /* Find largest even number N1 so that bits numbered 1 through 4523 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4524 * (N2 + 1) x 8 through 2007 are 0. */ 4525 n1 = 0; 4526 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4527 if (ps->tim[i]) { 4528 n1 = i & 0xfe; 4529 break; 4530 } 4531 } 4532 n2 = n1; 4533 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4534 if (ps->tim[i]) { 4535 n2 = i; 4536 break; 4537 } 4538 } 4539 4540 /* Bitmap control */ 4541 *pos++ = n1 | aid0; 4542 /* Part Virt Bitmap */ 4543 skb_put(skb, n2 - n1); 4544 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4545 4546 tim[1] = n2 - n1 + 4; 4547 } else { 4548 *pos++ = aid0; /* Bitmap control */ 4549 *pos++ = 0; /* Part Virt Bitmap */ 4550 } 4551 } 4552 4553 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4554 struct ps_data *ps, struct sk_buff *skb, 4555 bool is_template) 4556 { 4557 struct ieee80211_local *local = sdata->local; 4558 4559 /* 4560 * Not very nice, but we want to allow the driver to call 4561 * ieee80211_beacon_get() as a response to the set_tim() 4562 * callback. That, however, is already invoked under the 4563 * sta_lock to guarantee consistent and race-free update 4564 * of the tim bitmap in mac80211 and the driver. 4565 */ 4566 if (local->tim_in_locked_section) { 4567 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4568 } else { 4569 spin_lock_bh(&local->tim_lock); 4570 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4571 spin_unlock_bh(&local->tim_lock); 4572 } 4573 4574 return 0; 4575 } 4576 4577 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4578 struct beacon_data *beacon) 4579 { 4580 struct probe_resp *resp; 4581 u8 *beacon_data; 4582 size_t beacon_data_len; 4583 int i; 4584 u8 count = beacon->cntdwn_current_counter; 4585 4586 switch (sdata->vif.type) { 4587 case NL80211_IFTYPE_AP: 4588 beacon_data = beacon->tail; 4589 beacon_data_len = beacon->tail_len; 4590 break; 4591 case NL80211_IFTYPE_ADHOC: 4592 beacon_data = beacon->head; 4593 beacon_data_len = beacon->head_len; 4594 break; 4595 case NL80211_IFTYPE_MESH_POINT: 4596 beacon_data = beacon->head; 4597 beacon_data_len = beacon->head_len; 4598 break; 4599 default: 4600 return; 4601 } 4602 4603 rcu_read_lock(); 4604 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4605 resp = rcu_dereference(sdata->u.ap.probe_resp); 4606 4607 if (beacon->cntdwn_counter_offsets[i]) { 4608 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4609 beacon_data_len)) { 4610 rcu_read_unlock(); 4611 return; 4612 } 4613 4614 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4615 } 4616 4617 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4618 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4619 } 4620 rcu_read_unlock(); 4621 } 4622 4623 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4624 { 4625 beacon->cntdwn_current_counter--; 4626 4627 /* the counter should never reach 0 */ 4628 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4629 4630 return beacon->cntdwn_current_counter; 4631 } 4632 4633 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4634 { 4635 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4636 struct beacon_data *beacon = NULL; 4637 u8 count = 0; 4638 4639 rcu_read_lock(); 4640 4641 if (sdata->vif.type == NL80211_IFTYPE_AP) 4642 beacon = rcu_dereference(sdata->u.ap.beacon); 4643 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4644 beacon = rcu_dereference(sdata->u.ibss.presp); 4645 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4646 beacon = rcu_dereference(sdata->u.mesh.beacon); 4647 4648 if (!beacon) 4649 goto unlock; 4650 4651 count = __ieee80211_beacon_update_cntdwn(beacon); 4652 4653 unlock: 4654 rcu_read_unlock(); 4655 return count; 4656 } 4657 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4658 4659 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4660 { 4661 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4662 struct beacon_data *beacon = NULL; 4663 4664 rcu_read_lock(); 4665 4666 if (sdata->vif.type == NL80211_IFTYPE_AP) 4667 beacon = rcu_dereference(sdata->u.ap.beacon); 4668 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4669 beacon = rcu_dereference(sdata->u.ibss.presp); 4670 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4671 beacon = rcu_dereference(sdata->u.mesh.beacon); 4672 4673 if (!beacon) 4674 goto unlock; 4675 4676 if (counter < beacon->cntdwn_current_counter) 4677 beacon->cntdwn_current_counter = counter; 4678 4679 unlock: 4680 rcu_read_unlock(); 4681 } 4682 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4683 4684 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4685 { 4686 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4687 struct beacon_data *beacon = NULL; 4688 u8 *beacon_data; 4689 size_t beacon_data_len; 4690 int ret = false; 4691 4692 if (!ieee80211_sdata_running(sdata)) 4693 return false; 4694 4695 rcu_read_lock(); 4696 if (vif->type == NL80211_IFTYPE_AP) { 4697 struct ieee80211_if_ap *ap = &sdata->u.ap; 4698 4699 beacon = rcu_dereference(ap->beacon); 4700 if (WARN_ON(!beacon || !beacon->tail)) 4701 goto out; 4702 beacon_data = beacon->tail; 4703 beacon_data_len = beacon->tail_len; 4704 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4705 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4706 4707 beacon = rcu_dereference(ifibss->presp); 4708 if (!beacon) 4709 goto out; 4710 4711 beacon_data = beacon->head; 4712 beacon_data_len = beacon->head_len; 4713 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4714 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4715 4716 beacon = rcu_dereference(ifmsh->beacon); 4717 if (!beacon) 4718 goto out; 4719 4720 beacon_data = beacon->head; 4721 beacon_data_len = beacon->head_len; 4722 } else { 4723 WARN_ON(1); 4724 goto out; 4725 } 4726 4727 if (!beacon->cntdwn_counter_offsets[0]) 4728 goto out; 4729 4730 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4731 goto out; 4732 4733 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4734 ret = true; 4735 4736 out: 4737 rcu_read_unlock(); 4738 4739 return ret; 4740 } 4741 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4742 4743 static int ieee80211_beacon_protect(struct sk_buff *skb, 4744 struct ieee80211_local *local, 4745 struct ieee80211_sub_if_data *sdata) 4746 { 4747 ieee80211_tx_result res; 4748 struct ieee80211_tx_data tx; 4749 struct sk_buff *check_skb; 4750 4751 memset(&tx, 0, sizeof(tx)); 4752 tx.key = rcu_dereference(sdata->default_beacon_key); 4753 if (!tx.key) 4754 return 0; 4755 tx.local = local; 4756 tx.sdata = sdata; 4757 __skb_queue_head_init(&tx.skbs); 4758 __skb_queue_tail(&tx.skbs, skb); 4759 res = ieee80211_tx_h_encrypt(&tx); 4760 check_skb = __skb_dequeue(&tx.skbs); 4761 /* we may crash after this, but it'd be a bug in crypto */ 4762 WARN_ON(check_skb != skb); 4763 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4764 return -EINVAL; 4765 4766 return 0; 4767 } 4768 4769 static struct sk_buff * 4770 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4771 struct ieee80211_vif *vif, 4772 struct ieee80211_mutable_offsets *offs, 4773 bool is_template) 4774 { 4775 struct ieee80211_local *local = hw_to_local(hw); 4776 struct beacon_data *beacon = NULL; 4777 struct sk_buff *skb = NULL; 4778 struct ieee80211_tx_info *info; 4779 struct ieee80211_sub_if_data *sdata = NULL; 4780 enum nl80211_band band; 4781 struct ieee80211_tx_rate_control txrc; 4782 struct ieee80211_chanctx_conf *chanctx_conf; 4783 int csa_off_base = 0; 4784 4785 rcu_read_lock(); 4786 4787 sdata = vif_to_sdata(vif); 4788 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4789 4790 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4791 goto out; 4792 4793 if (offs) 4794 memset(offs, 0, sizeof(*offs)); 4795 4796 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4797 struct ieee80211_if_ap *ap = &sdata->u.ap; 4798 4799 beacon = rcu_dereference(ap->beacon); 4800 if (beacon) { 4801 if (beacon->cntdwn_counter_offsets[0]) { 4802 if (!is_template) 4803 ieee80211_beacon_update_cntdwn(vif); 4804 4805 ieee80211_set_beacon_cntdwn(sdata, beacon); 4806 } 4807 4808 /* 4809 * headroom, head length, 4810 * tail length and maximum TIM length 4811 */ 4812 skb = dev_alloc_skb(local->tx_headroom + 4813 beacon->head_len + 4814 beacon->tail_len + 256 + 4815 local->hw.extra_beacon_tailroom); 4816 if (!skb) 4817 goto out; 4818 4819 skb_reserve(skb, local->tx_headroom); 4820 skb_put_data(skb, beacon->head, beacon->head_len); 4821 4822 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4823 is_template); 4824 4825 if (offs) { 4826 offs->tim_offset = beacon->head_len; 4827 offs->tim_length = skb->len - beacon->head_len; 4828 4829 /* for AP the csa offsets are from tail */ 4830 csa_off_base = skb->len; 4831 } 4832 4833 if (beacon->tail) 4834 skb_put_data(skb, beacon->tail, 4835 beacon->tail_len); 4836 4837 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4838 goto out; 4839 } else 4840 goto out; 4841 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4842 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4843 struct ieee80211_hdr *hdr; 4844 4845 beacon = rcu_dereference(ifibss->presp); 4846 if (!beacon) 4847 goto out; 4848 4849 if (beacon->cntdwn_counter_offsets[0]) { 4850 if (!is_template) 4851 __ieee80211_beacon_update_cntdwn(beacon); 4852 4853 ieee80211_set_beacon_cntdwn(sdata, beacon); 4854 } 4855 4856 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4857 local->hw.extra_beacon_tailroom); 4858 if (!skb) 4859 goto out; 4860 skb_reserve(skb, local->tx_headroom); 4861 skb_put_data(skb, beacon->head, beacon->head_len); 4862 4863 hdr = (struct ieee80211_hdr *) skb->data; 4864 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4865 IEEE80211_STYPE_BEACON); 4866 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4867 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4868 4869 beacon = rcu_dereference(ifmsh->beacon); 4870 if (!beacon) 4871 goto out; 4872 4873 if (beacon->cntdwn_counter_offsets[0]) { 4874 if (!is_template) 4875 /* TODO: For mesh csa_counter is in TU, so 4876 * decrementing it by one isn't correct, but 4877 * for now we leave it consistent with overall 4878 * mac80211's behavior. 4879 */ 4880 __ieee80211_beacon_update_cntdwn(beacon); 4881 4882 ieee80211_set_beacon_cntdwn(sdata, beacon); 4883 } 4884 4885 if (ifmsh->sync_ops) 4886 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4887 4888 skb = dev_alloc_skb(local->tx_headroom + 4889 beacon->head_len + 4890 256 + /* TIM IE */ 4891 beacon->tail_len + 4892 local->hw.extra_beacon_tailroom); 4893 if (!skb) 4894 goto out; 4895 skb_reserve(skb, local->tx_headroom); 4896 skb_put_data(skb, beacon->head, beacon->head_len); 4897 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4898 4899 if (offs) { 4900 offs->tim_offset = beacon->head_len; 4901 offs->tim_length = skb->len - beacon->head_len; 4902 } 4903 4904 skb_put_data(skb, beacon->tail, beacon->tail_len); 4905 } else { 4906 WARN_ON(1); 4907 goto out; 4908 } 4909 4910 /* CSA offsets */ 4911 if (offs && beacon) { 4912 int i; 4913 4914 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4915 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 4916 4917 if (!csa_off) 4918 continue; 4919 4920 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 4921 } 4922 } 4923 4924 band = chanctx_conf->def.chan->band; 4925 4926 info = IEEE80211_SKB_CB(skb); 4927 4928 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4929 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4930 info->band = band; 4931 4932 memset(&txrc, 0, sizeof(txrc)); 4933 txrc.hw = hw; 4934 txrc.sband = local->hw.wiphy->bands[band]; 4935 txrc.bss_conf = &sdata->vif.bss_conf; 4936 txrc.skb = skb; 4937 txrc.reported_rate.idx = -1; 4938 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4939 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4940 else 4941 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4942 txrc.bss = true; 4943 rate_control_get_rate(sdata, NULL, &txrc); 4944 4945 info->control.vif = vif; 4946 4947 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4948 IEEE80211_TX_CTL_ASSIGN_SEQ | 4949 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4950 out: 4951 rcu_read_unlock(); 4952 return skb; 4953 4954 } 4955 4956 struct sk_buff * 4957 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4958 struct ieee80211_vif *vif, 4959 struct ieee80211_mutable_offsets *offs) 4960 { 4961 return __ieee80211_beacon_get(hw, vif, offs, true); 4962 } 4963 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4964 4965 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4966 struct ieee80211_vif *vif, 4967 u16 *tim_offset, u16 *tim_length) 4968 { 4969 struct ieee80211_mutable_offsets offs = {}; 4970 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4971 struct sk_buff *copy; 4972 struct ieee80211_supported_band *sband; 4973 int shift; 4974 4975 if (!bcn) 4976 return bcn; 4977 4978 if (tim_offset) 4979 *tim_offset = offs.tim_offset; 4980 4981 if (tim_length) 4982 *tim_length = offs.tim_length; 4983 4984 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4985 !hw_to_local(hw)->monitors) 4986 return bcn; 4987 4988 /* send a copy to monitor interfaces */ 4989 copy = skb_copy(bcn, GFP_ATOMIC); 4990 if (!copy) 4991 return bcn; 4992 4993 shift = ieee80211_vif_get_shift(vif); 4994 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4995 if (!sband) 4996 return bcn; 4997 4998 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4999 NULL); 5000 5001 return bcn; 5002 } 5003 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5004 5005 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5006 struct ieee80211_vif *vif) 5007 { 5008 struct ieee80211_if_ap *ap = NULL; 5009 struct sk_buff *skb = NULL; 5010 struct probe_resp *presp = NULL; 5011 struct ieee80211_hdr *hdr; 5012 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5013 5014 if (sdata->vif.type != NL80211_IFTYPE_AP) 5015 return NULL; 5016 5017 rcu_read_lock(); 5018 5019 ap = &sdata->u.ap; 5020 presp = rcu_dereference(ap->probe_resp); 5021 if (!presp) 5022 goto out; 5023 5024 skb = dev_alloc_skb(presp->len); 5025 if (!skb) 5026 goto out; 5027 5028 skb_put_data(skb, presp->data, presp->len); 5029 5030 hdr = (struct ieee80211_hdr *) skb->data; 5031 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5032 5033 out: 5034 rcu_read_unlock(); 5035 return skb; 5036 } 5037 EXPORT_SYMBOL(ieee80211_proberesp_get); 5038 5039 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5040 struct ieee80211_vif *vif) 5041 { 5042 struct sk_buff *skb = NULL; 5043 struct fils_discovery_data *tmpl = NULL; 5044 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5045 5046 if (sdata->vif.type != NL80211_IFTYPE_AP) 5047 return NULL; 5048 5049 rcu_read_lock(); 5050 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5051 if (!tmpl) { 5052 rcu_read_unlock(); 5053 return NULL; 5054 } 5055 5056 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5057 if (skb) { 5058 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5059 skb_put_data(skb, tmpl->data, tmpl->len); 5060 } 5061 5062 rcu_read_unlock(); 5063 return skb; 5064 } 5065 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5066 5067 struct sk_buff * 5068 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5069 struct ieee80211_vif *vif) 5070 { 5071 struct sk_buff *skb = NULL; 5072 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5073 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5074 5075 if (sdata->vif.type != NL80211_IFTYPE_AP) 5076 return NULL; 5077 5078 rcu_read_lock(); 5079 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5080 if (!tmpl) { 5081 rcu_read_unlock(); 5082 return NULL; 5083 } 5084 5085 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5086 if (skb) { 5087 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5088 skb_put_data(skb, tmpl->data, tmpl->len); 5089 } 5090 5091 rcu_read_unlock(); 5092 return skb; 5093 } 5094 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5095 5096 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5097 struct ieee80211_vif *vif) 5098 { 5099 struct ieee80211_sub_if_data *sdata; 5100 struct ieee80211_if_managed *ifmgd; 5101 struct ieee80211_pspoll *pspoll; 5102 struct ieee80211_local *local; 5103 struct sk_buff *skb; 5104 5105 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5106 return NULL; 5107 5108 sdata = vif_to_sdata(vif); 5109 ifmgd = &sdata->u.mgd; 5110 local = sdata->local; 5111 5112 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5113 if (!skb) 5114 return NULL; 5115 5116 skb_reserve(skb, local->hw.extra_tx_headroom); 5117 5118 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5119 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5120 IEEE80211_STYPE_PSPOLL); 5121 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5122 5123 /* aid in PS-Poll has its two MSBs each set to 1 */ 5124 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5125 5126 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5127 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5128 5129 return skb; 5130 } 5131 EXPORT_SYMBOL(ieee80211_pspoll_get); 5132 5133 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5134 struct ieee80211_vif *vif, 5135 bool qos_ok) 5136 { 5137 struct ieee80211_hdr_3addr *nullfunc; 5138 struct ieee80211_sub_if_data *sdata; 5139 struct ieee80211_if_managed *ifmgd; 5140 struct ieee80211_local *local; 5141 struct sk_buff *skb; 5142 bool qos = false; 5143 5144 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5145 return NULL; 5146 5147 sdata = vif_to_sdata(vif); 5148 ifmgd = &sdata->u.mgd; 5149 local = sdata->local; 5150 5151 if (qos_ok) { 5152 struct sta_info *sta; 5153 5154 rcu_read_lock(); 5155 sta = sta_info_get(sdata, ifmgd->bssid); 5156 qos = sta && sta->sta.wme; 5157 rcu_read_unlock(); 5158 } 5159 5160 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5161 sizeof(*nullfunc) + 2); 5162 if (!skb) 5163 return NULL; 5164 5165 skb_reserve(skb, local->hw.extra_tx_headroom); 5166 5167 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5168 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5169 IEEE80211_STYPE_NULLFUNC | 5170 IEEE80211_FCTL_TODS); 5171 if (qos) { 5172 __le16 qoshdr = cpu_to_le16(7); 5173 5174 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5175 IEEE80211_STYPE_NULLFUNC) != 5176 IEEE80211_STYPE_QOS_NULLFUNC); 5177 nullfunc->frame_control |= 5178 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5179 skb->priority = 7; 5180 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5181 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5182 } 5183 5184 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5185 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5186 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5187 5188 return skb; 5189 } 5190 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5191 5192 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5193 const u8 *src_addr, 5194 const u8 *ssid, size_t ssid_len, 5195 size_t tailroom) 5196 { 5197 struct ieee80211_local *local = hw_to_local(hw); 5198 struct ieee80211_hdr_3addr *hdr; 5199 struct sk_buff *skb; 5200 size_t ie_ssid_len; 5201 u8 *pos; 5202 5203 ie_ssid_len = 2 + ssid_len; 5204 5205 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5206 ie_ssid_len + tailroom); 5207 if (!skb) 5208 return NULL; 5209 5210 skb_reserve(skb, local->hw.extra_tx_headroom); 5211 5212 hdr = skb_put_zero(skb, sizeof(*hdr)); 5213 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5214 IEEE80211_STYPE_PROBE_REQ); 5215 eth_broadcast_addr(hdr->addr1); 5216 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5217 eth_broadcast_addr(hdr->addr3); 5218 5219 pos = skb_put(skb, ie_ssid_len); 5220 *pos++ = WLAN_EID_SSID; 5221 *pos++ = ssid_len; 5222 if (ssid_len) 5223 memcpy(pos, ssid, ssid_len); 5224 pos += ssid_len; 5225 5226 return skb; 5227 } 5228 EXPORT_SYMBOL(ieee80211_probereq_get); 5229 5230 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5231 const void *frame, size_t frame_len, 5232 const struct ieee80211_tx_info *frame_txctl, 5233 struct ieee80211_rts *rts) 5234 { 5235 const struct ieee80211_hdr *hdr = frame; 5236 5237 rts->frame_control = 5238 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5239 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5240 frame_txctl); 5241 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5242 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5243 } 5244 EXPORT_SYMBOL(ieee80211_rts_get); 5245 5246 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5247 const void *frame, size_t frame_len, 5248 const struct ieee80211_tx_info *frame_txctl, 5249 struct ieee80211_cts *cts) 5250 { 5251 const struct ieee80211_hdr *hdr = frame; 5252 5253 cts->frame_control = 5254 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5255 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5256 frame_len, frame_txctl); 5257 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5258 } 5259 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5260 5261 struct sk_buff * 5262 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5263 struct ieee80211_vif *vif) 5264 { 5265 struct ieee80211_local *local = hw_to_local(hw); 5266 struct sk_buff *skb = NULL; 5267 struct ieee80211_tx_data tx; 5268 struct ieee80211_sub_if_data *sdata; 5269 struct ps_data *ps; 5270 struct ieee80211_tx_info *info; 5271 struct ieee80211_chanctx_conf *chanctx_conf; 5272 5273 sdata = vif_to_sdata(vif); 5274 5275 rcu_read_lock(); 5276 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5277 5278 if (!chanctx_conf) 5279 goto out; 5280 5281 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5282 struct beacon_data *beacon = 5283 rcu_dereference(sdata->u.ap.beacon); 5284 5285 if (!beacon || !beacon->head) 5286 goto out; 5287 5288 ps = &sdata->u.ap.ps; 5289 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5290 ps = &sdata->u.mesh.ps; 5291 } else { 5292 goto out; 5293 } 5294 5295 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5296 goto out; /* send buffered bc/mc only after DTIM beacon */ 5297 5298 while (1) { 5299 skb = skb_dequeue(&ps->bc_buf); 5300 if (!skb) 5301 goto out; 5302 local->total_ps_buffered--; 5303 5304 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5305 struct ieee80211_hdr *hdr = 5306 (struct ieee80211_hdr *) skb->data; 5307 /* more buffered multicast/broadcast frames ==> set 5308 * MoreData flag in IEEE 802.11 header to inform PS 5309 * STAs */ 5310 hdr->frame_control |= 5311 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5312 } 5313 5314 if (sdata->vif.type == NL80211_IFTYPE_AP) 5315 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5316 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5317 break; 5318 ieee80211_free_txskb(hw, skb); 5319 } 5320 5321 info = IEEE80211_SKB_CB(skb); 5322 5323 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5324 info->band = chanctx_conf->def.chan->band; 5325 5326 if (invoke_tx_handlers(&tx)) 5327 skb = NULL; 5328 out: 5329 rcu_read_unlock(); 5330 5331 return skb; 5332 } 5333 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5334 5335 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5336 { 5337 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5338 struct ieee80211_sub_if_data *sdata = sta->sdata; 5339 struct ieee80211_local *local = sdata->local; 5340 int ret; 5341 u32 queues; 5342 5343 lockdep_assert_held(&local->sta_mtx); 5344 5345 /* only some cases are supported right now */ 5346 switch (sdata->vif.type) { 5347 case NL80211_IFTYPE_STATION: 5348 case NL80211_IFTYPE_AP: 5349 case NL80211_IFTYPE_AP_VLAN: 5350 break; 5351 default: 5352 WARN_ON(1); 5353 return -EINVAL; 5354 } 5355 5356 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5357 return -EINVAL; 5358 5359 if (sta->reserved_tid == tid) { 5360 ret = 0; 5361 goto out; 5362 } 5363 5364 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5365 sdata_err(sdata, "TID reservation already active\n"); 5366 ret = -EALREADY; 5367 goto out; 5368 } 5369 5370 ieee80211_stop_vif_queues(sdata->local, sdata, 5371 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5372 5373 synchronize_net(); 5374 5375 /* Tear down BA sessions so we stop aggregating on this TID */ 5376 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5377 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5378 __ieee80211_stop_tx_ba_session(sta, tid, 5379 AGG_STOP_LOCAL_REQUEST); 5380 } 5381 5382 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5383 __ieee80211_flush_queues(local, sdata, queues, false); 5384 5385 sta->reserved_tid = tid; 5386 5387 ieee80211_wake_vif_queues(local, sdata, 5388 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5389 5390 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5391 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5392 5393 ret = 0; 5394 out: 5395 return ret; 5396 } 5397 EXPORT_SYMBOL(ieee80211_reserve_tid); 5398 5399 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5400 { 5401 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5402 struct ieee80211_sub_if_data *sdata = sta->sdata; 5403 5404 lockdep_assert_held(&sdata->local->sta_mtx); 5405 5406 /* only some cases are supported right now */ 5407 switch (sdata->vif.type) { 5408 case NL80211_IFTYPE_STATION: 5409 case NL80211_IFTYPE_AP: 5410 case NL80211_IFTYPE_AP_VLAN: 5411 break; 5412 default: 5413 WARN_ON(1); 5414 return; 5415 } 5416 5417 if (tid != sta->reserved_tid) { 5418 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5419 return; 5420 } 5421 5422 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5423 } 5424 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5425 5426 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5427 struct sk_buff *skb, int tid, 5428 enum nl80211_band band) 5429 { 5430 int ac = ieee80211_ac_from_tid(tid); 5431 5432 skb_reset_mac_header(skb); 5433 skb_set_queue_mapping(skb, ac); 5434 skb->priority = tid; 5435 5436 skb->dev = sdata->dev; 5437 5438 /* 5439 * The other path calling ieee80211_xmit is from the tasklet, 5440 * and while we can handle concurrent transmissions locking 5441 * requirements are that we do not come into tx with bhs on. 5442 */ 5443 local_bh_disable(); 5444 IEEE80211_SKB_CB(skb)->band = band; 5445 ieee80211_xmit(sdata, NULL, skb); 5446 local_bh_enable(); 5447 } 5448 5449 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5450 const u8 *buf, size_t len, 5451 const u8 *dest, __be16 proto, bool unencrypted, 5452 u64 *cookie) 5453 { 5454 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5455 struct ieee80211_local *local = sdata->local; 5456 struct sta_info *sta; 5457 struct sk_buff *skb; 5458 struct ethhdr *ehdr; 5459 u32 ctrl_flags = 0; 5460 u32 flags = 0; 5461 5462 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5463 * or Pre-Authentication 5464 */ 5465 if (proto != sdata->control_port_protocol && 5466 proto != cpu_to_be16(ETH_P_PREAUTH)) 5467 return -EINVAL; 5468 5469 if (proto == sdata->control_port_protocol) 5470 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5471 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5472 5473 if (unencrypted) 5474 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5475 5476 if (cookie) 5477 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5478 5479 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5480 5481 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5482 sizeof(struct ethhdr) + len); 5483 if (!skb) 5484 return -ENOMEM; 5485 5486 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5487 5488 skb_put_data(skb, buf, len); 5489 5490 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5491 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5492 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5493 ehdr->h_proto = proto; 5494 5495 skb->dev = dev; 5496 skb->protocol = proto; 5497 skb_reset_network_header(skb); 5498 skb_reset_mac_header(skb); 5499 5500 /* update QoS header to prioritize control port frames if possible, 5501 * priorization also happens for control port frames send over 5502 * AF_PACKET 5503 */ 5504 rcu_read_lock(); 5505 5506 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5507 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5508 5509 skb_set_queue_mapping(skb, queue); 5510 skb_get_hash(skb); 5511 } 5512 5513 rcu_read_unlock(); 5514 5515 /* mutex lock is only needed for incrementing the cookie counter */ 5516 mutex_lock(&local->mtx); 5517 5518 local_bh_disable(); 5519 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5520 local_bh_enable(); 5521 5522 mutex_unlock(&local->mtx); 5523 5524 return 0; 5525 } 5526 5527 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5528 const u8 *buf, size_t len) 5529 { 5530 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5531 struct ieee80211_local *local = sdata->local; 5532 struct sk_buff *skb; 5533 5534 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5535 30 + /* header size */ 5536 18); /* 11s header size */ 5537 if (!skb) 5538 return -ENOMEM; 5539 5540 skb_reserve(skb, local->hw.extra_tx_headroom); 5541 skb_put_data(skb, buf, len); 5542 5543 skb->dev = dev; 5544 skb->protocol = htons(ETH_P_802_3); 5545 skb_reset_network_header(skb); 5546 skb_reset_mac_header(skb); 5547 5548 local_bh_disable(); 5549 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5550 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5551 NULL); 5552 local_bh_enable(); 5553 5554 return 0; 5555 } 5556