1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2021 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <linux/timekeeping.h> 22 #include <net/net_namespace.h> 23 #include <net/ieee80211_radiotap.h> 24 #include <net/cfg80211.h> 25 #include <net/mac80211.h> 26 #include <net/codel.h> 27 #include <net/codel_impl.h> 28 #include <asm/unaligned.h> 29 #include <net/fq_impl.h> 30 31 #include "ieee80211_i.h" 32 #include "driver-ops.h" 33 #include "led.h" 34 #include "mesh.h" 35 #include "wep.h" 36 #include "wpa.h" 37 #include "wme.h" 38 #include "rate.h" 39 40 /* misc utils */ 41 42 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 43 struct sk_buff *skb, int group_addr, 44 int next_frag_len) 45 { 46 int rate, mrate, erp, dur, i, shift = 0; 47 struct ieee80211_rate *txrate; 48 struct ieee80211_local *local = tx->local; 49 struct ieee80211_supported_band *sband; 50 struct ieee80211_hdr *hdr; 51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 52 struct ieee80211_chanctx_conf *chanctx_conf; 53 u32 rate_flags = 0; 54 55 /* assume HW handles this */ 56 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 57 return 0; 58 59 rcu_read_lock(); 60 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 61 if (chanctx_conf) { 62 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 63 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 64 } 65 rcu_read_unlock(); 66 67 /* uh huh? */ 68 if (WARN_ON_ONCE(tx->rate.idx < 0)) 69 return 0; 70 71 sband = local->hw.wiphy->bands[info->band]; 72 txrate = &sband->bitrates[tx->rate.idx]; 73 74 erp = txrate->flags & IEEE80211_RATE_ERP_G; 75 76 /* device is expected to do this */ 77 if (sband->band == NL80211_BAND_S1GHZ) 78 return 0; 79 80 /* 81 * data and mgmt (except PS Poll): 82 * - during CFP: 32768 83 * - during contention period: 84 * if addr1 is group address: 0 85 * if more fragments = 0 and addr1 is individual address: time to 86 * transmit one ACK plus SIFS 87 * if more fragments = 1 and addr1 is individual address: time to 88 * transmit next fragment plus 2 x ACK plus 3 x SIFS 89 * 90 * IEEE 802.11, 9.6: 91 * - control response frame (CTS or ACK) shall be transmitted using the 92 * same rate as the immediately previous frame in the frame exchange 93 * sequence, if this rate belongs to the PHY mandatory rates, or else 94 * at the highest possible rate belonging to the PHY rates in the 95 * BSSBasicRateSet 96 */ 97 hdr = (struct ieee80211_hdr *)skb->data; 98 if (ieee80211_is_ctl(hdr->frame_control)) { 99 /* TODO: These control frames are not currently sent by 100 * mac80211, but should they be implemented, this function 101 * needs to be updated to support duration field calculation. 102 * 103 * RTS: time needed to transmit pending data/mgmt frame plus 104 * one CTS frame plus one ACK frame plus 3 x SIFS 105 * CTS: duration of immediately previous RTS minus time 106 * required to transmit CTS and its SIFS 107 * ACK: 0 if immediately previous directed data/mgmt had 108 * more=0, with more=1 duration in ACK frame is duration 109 * from previous frame minus time needed to transmit ACK 110 * and its SIFS 111 * PS Poll: BIT(15) | BIT(14) | aid 112 */ 113 return 0; 114 } 115 116 /* data/mgmt */ 117 if (0 /* FIX: data/mgmt during CFP */) 118 return cpu_to_le16(32768); 119 120 if (group_addr) /* Group address as the destination - no ACK */ 121 return 0; 122 123 /* Individual destination address: 124 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 125 * CTS and ACK frames shall be transmitted using the highest rate in 126 * basic rate set that is less than or equal to the rate of the 127 * immediately previous frame and that is using the same modulation 128 * (CCK or OFDM). If no basic rate set matches with these requirements, 129 * the highest mandatory rate of the PHY that is less than or equal to 130 * the rate of the previous frame is used. 131 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 132 */ 133 rate = -1; 134 /* use lowest available if everything fails */ 135 mrate = sband->bitrates[0].bitrate; 136 for (i = 0; i < sband->n_bitrates; i++) { 137 struct ieee80211_rate *r = &sband->bitrates[i]; 138 139 if (r->bitrate > txrate->bitrate) 140 break; 141 142 if ((rate_flags & r->flags) != rate_flags) 143 continue; 144 145 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 146 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 147 148 switch (sband->band) { 149 case NL80211_BAND_2GHZ: { 150 u32 flag; 151 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 152 flag = IEEE80211_RATE_MANDATORY_G; 153 else 154 flag = IEEE80211_RATE_MANDATORY_B; 155 if (r->flags & flag) 156 mrate = r->bitrate; 157 break; 158 } 159 case NL80211_BAND_5GHZ: 160 case NL80211_BAND_6GHZ: 161 if (r->flags & IEEE80211_RATE_MANDATORY_A) 162 mrate = r->bitrate; 163 break; 164 case NL80211_BAND_S1GHZ: 165 case NL80211_BAND_60GHZ: 166 /* TODO, for now fall through */ 167 case NUM_NL80211_BANDS: 168 WARN_ON(1); 169 break; 170 } 171 } 172 if (rate == -1) { 173 /* No matching basic rate found; use highest suitable mandatory 174 * PHY rate */ 175 rate = DIV_ROUND_UP(mrate, 1 << shift); 176 } 177 178 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 179 if (ieee80211_is_data_qos(hdr->frame_control) && 180 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 181 dur = 0; 182 else 183 /* Time needed to transmit ACK 184 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 185 * to closest integer */ 186 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 187 tx->sdata->vif.bss_conf.use_short_preamble, 188 shift); 189 190 if (next_frag_len) { 191 /* Frame is fragmented: duration increases with time needed to 192 * transmit next fragment plus ACK and 2 x SIFS. */ 193 dur *= 2; /* ACK + SIFS */ 194 /* next fragment */ 195 dur += ieee80211_frame_duration(sband->band, next_frag_len, 196 txrate->bitrate, erp, 197 tx->sdata->vif.bss_conf.use_short_preamble, 198 shift); 199 } 200 201 return cpu_to_le16(dur); 202 } 203 204 /* tx handlers */ 205 static ieee80211_tx_result debug_noinline 206 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 207 { 208 struct ieee80211_local *local = tx->local; 209 struct ieee80211_if_managed *ifmgd; 210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 211 212 /* driver doesn't support power save */ 213 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 214 return TX_CONTINUE; 215 216 /* hardware does dynamic power save */ 217 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 218 return TX_CONTINUE; 219 220 /* dynamic power save disabled */ 221 if (local->hw.conf.dynamic_ps_timeout <= 0) 222 return TX_CONTINUE; 223 224 /* we are scanning, don't enable power save */ 225 if (local->scanning) 226 return TX_CONTINUE; 227 228 if (!local->ps_sdata) 229 return TX_CONTINUE; 230 231 /* No point if we're going to suspend */ 232 if (local->quiescing) 233 return TX_CONTINUE; 234 235 /* dynamic ps is supported only in managed mode */ 236 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 237 return TX_CONTINUE; 238 239 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 240 return TX_CONTINUE; 241 242 ifmgd = &tx->sdata->u.mgd; 243 244 /* 245 * Don't wakeup from power save if u-apsd is enabled, voip ac has 246 * u-apsd enabled and the frame is in voip class. This effectively 247 * means that even if all access categories have u-apsd enabled, in 248 * practise u-apsd is only used with the voip ac. This is a 249 * workaround for the case when received voip class packets do not 250 * have correct qos tag for some reason, due the network or the 251 * peer application. 252 * 253 * Note: ifmgd->uapsd_queues access is racy here. If the value is 254 * changed via debugfs, user needs to reassociate manually to have 255 * everything in sync. 256 */ 257 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 258 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 259 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 260 return TX_CONTINUE; 261 262 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 263 ieee80211_stop_queues_by_reason(&local->hw, 264 IEEE80211_MAX_QUEUE_MAP, 265 IEEE80211_QUEUE_STOP_REASON_PS, 266 false); 267 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 268 ieee80211_queue_work(&local->hw, 269 &local->dynamic_ps_disable_work); 270 } 271 272 /* Don't restart the timer if we're not disassociated */ 273 if (!ifmgd->associated) 274 return TX_CONTINUE; 275 276 mod_timer(&local->dynamic_ps_timer, jiffies + 277 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 278 279 return TX_CONTINUE; 280 } 281 282 static ieee80211_tx_result debug_noinline 283 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 284 { 285 286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 288 bool assoc = false; 289 290 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 291 return TX_CONTINUE; 292 293 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 294 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 295 !ieee80211_is_probe_req(hdr->frame_control) && 296 !ieee80211_is_any_nullfunc(hdr->frame_control)) 297 /* 298 * When software scanning only nullfunc frames (to notify 299 * the sleep state to the AP) and probe requests (for the 300 * active scan) are allowed, all other frames should not be 301 * sent and we should not get here, but if we do 302 * nonetheless, drop them to avoid sending them 303 * off-channel. See the link below and 304 * ieee80211_start_scan() for more. 305 * 306 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 307 */ 308 return TX_DROP; 309 310 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 311 return TX_CONTINUE; 312 313 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 314 return TX_CONTINUE; 315 316 if (tx->sta) 317 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 318 319 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 320 if (unlikely(!assoc && 321 ieee80211_is_data(hdr->frame_control))) { 322 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 323 sdata_info(tx->sdata, 324 "dropped data frame to not associated station %pM\n", 325 hdr->addr1); 326 #endif 327 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 328 return TX_DROP; 329 } 330 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 331 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 332 /* 333 * No associated STAs - no need to send multicast 334 * frames. 335 */ 336 return TX_DROP; 337 } 338 339 return TX_CONTINUE; 340 } 341 342 /* This function is called whenever the AP is about to exceed the maximum limit 343 * of buffered frames for power saving STAs. This situation should not really 344 * happen often during normal operation, so dropping the oldest buffered packet 345 * from each queue should be OK to make some room for new frames. */ 346 static void purge_old_ps_buffers(struct ieee80211_local *local) 347 { 348 int total = 0, purged = 0; 349 struct sk_buff *skb; 350 struct ieee80211_sub_if_data *sdata; 351 struct sta_info *sta; 352 353 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 354 struct ps_data *ps; 355 356 if (sdata->vif.type == NL80211_IFTYPE_AP) 357 ps = &sdata->u.ap.ps; 358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 359 ps = &sdata->u.mesh.ps; 360 else 361 continue; 362 363 skb = skb_dequeue(&ps->bc_buf); 364 if (skb) { 365 purged++; 366 ieee80211_free_txskb(&local->hw, skb); 367 } 368 total += skb_queue_len(&ps->bc_buf); 369 } 370 371 /* 372 * Drop one frame from each station from the lowest-priority 373 * AC that has frames at all. 374 */ 375 list_for_each_entry_rcu(sta, &local->sta_list, list) { 376 int ac; 377 378 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 379 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 380 total += skb_queue_len(&sta->ps_tx_buf[ac]); 381 if (skb) { 382 purged++; 383 ieee80211_free_txskb(&local->hw, skb); 384 break; 385 } 386 } 387 } 388 389 local->total_ps_buffered = total; 390 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 391 } 392 393 static ieee80211_tx_result 394 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 395 { 396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 398 struct ps_data *ps; 399 400 /* 401 * broadcast/multicast frame 402 * 403 * If any of the associated/peer stations is in power save mode, 404 * the frame is buffered to be sent after DTIM beacon frame. 405 * This is done either by the hardware or us. 406 */ 407 408 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 409 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 410 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 411 if (!tx->sdata->bss) 412 return TX_CONTINUE; 413 414 ps = &tx->sdata->bss->ps; 415 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 416 ps = &tx->sdata->u.mesh.ps; 417 } else { 418 return TX_CONTINUE; 419 } 420 421 422 /* no buffering for ordered frames */ 423 if (ieee80211_has_order(hdr->frame_control)) 424 return TX_CONTINUE; 425 426 if (ieee80211_is_probe_req(hdr->frame_control)) 427 return TX_CONTINUE; 428 429 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 430 info->hw_queue = tx->sdata->vif.cab_queue; 431 432 /* no stations in PS mode and no buffered packets */ 433 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 434 return TX_CONTINUE; 435 436 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 437 438 /* device releases frame after DTIM beacon */ 439 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 440 return TX_CONTINUE; 441 442 /* buffered in mac80211 */ 443 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 444 purge_old_ps_buffers(tx->local); 445 446 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 447 ps_dbg(tx->sdata, 448 "BC TX buffer full - dropping the oldest frame\n"); 449 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 450 } else 451 tx->local->total_ps_buffered++; 452 453 skb_queue_tail(&ps->bc_buf, tx->skb); 454 455 return TX_QUEUED; 456 } 457 458 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 459 struct sk_buff *skb) 460 { 461 if (!ieee80211_is_mgmt(fc)) 462 return 0; 463 464 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 465 return 0; 466 467 if (!ieee80211_is_robust_mgmt_frame(skb)) 468 return 0; 469 470 return 1; 471 } 472 473 static ieee80211_tx_result 474 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 475 { 476 struct sta_info *sta = tx->sta; 477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 479 struct ieee80211_local *local = tx->local; 480 481 if (unlikely(!sta)) 482 return TX_CONTINUE; 483 484 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 485 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 486 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 487 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 488 int ac = skb_get_queue_mapping(tx->skb); 489 490 if (ieee80211_is_mgmt(hdr->frame_control) && 491 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 492 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 493 return TX_CONTINUE; 494 } 495 496 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 497 sta->sta.addr, sta->sta.aid, ac); 498 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 499 purge_old_ps_buffers(tx->local); 500 501 /* sync with ieee80211_sta_ps_deliver_wakeup */ 502 spin_lock(&sta->ps_lock); 503 /* 504 * STA woke up the meantime and all the frames on ps_tx_buf have 505 * been queued to pending queue. No reordering can happen, go 506 * ahead and Tx the packet. 507 */ 508 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 509 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 510 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 511 spin_unlock(&sta->ps_lock); 512 return TX_CONTINUE; 513 } 514 515 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 516 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 517 ps_dbg(tx->sdata, 518 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 519 sta->sta.addr, ac); 520 ieee80211_free_txskb(&local->hw, old); 521 } else 522 tx->local->total_ps_buffered++; 523 524 info->control.jiffies = jiffies; 525 info->control.vif = &tx->sdata->vif; 526 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 527 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 528 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 529 spin_unlock(&sta->ps_lock); 530 531 if (!timer_pending(&local->sta_cleanup)) 532 mod_timer(&local->sta_cleanup, 533 round_jiffies(jiffies + 534 STA_INFO_CLEANUP_INTERVAL)); 535 536 /* 537 * We queued up some frames, so the TIM bit might 538 * need to be set, recalculate it. 539 */ 540 sta_info_recalc_tim(sta); 541 542 return TX_QUEUED; 543 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 544 ps_dbg(tx->sdata, 545 "STA %pM in PS mode, but polling/in SP -> send frame\n", 546 sta->sta.addr); 547 } 548 549 return TX_CONTINUE; 550 } 551 552 static ieee80211_tx_result debug_noinline 553 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 554 { 555 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 556 return TX_CONTINUE; 557 558 if (tx->flags & IEEE80211_TX_UNICAST) 559 return ieee80211_tx_h_unicast_ps_buf(tx); 560 else 561 return ieee80211_tx_h_multicast_ps_buf(tx); 562 } 563 564 static ieee80211_tx_result debug_noinline 565 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 566 { 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 569 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 570 if (tx->sdata->control_port_no_encrypt) 571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 572 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 573 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 574 } 575 576 return TX_CONTINUE; 577 } 578 579 static ieee80211_tx_result debug_noinline 580 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 581 { 582 struct ieee80211_key *key; 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 585 586 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 587 tx->key = NULL; 588 return TX_CONTINUE; 589 } 590 591 if (tx->sta && 592 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 593 tx->key = key; 594 else if (ieee80211_is_group_privacy_action(tx->skb) && 595 (key = rcu_dereference(tx->sdata->default_multicast_key))) 596 tx->key = key; 597 else if (ieee80211_is_mgmt(hdr->frame_control) && 598 is_multicast_ether_addr(hdr->addr1) && 599 ieee80211_is_robust_mgmt_frame(tx->skb) && 600 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 601 tx->key = key; 602 else if (is_multicast_ether_addr(hdr->addr1) && 603 (key = rcu_dereference(tx->sdata->default_multicast_key))) 604 tx->key = key; 605 else if (!is_multicast_ether_addr(hdr->addr1) && 606 (key = rcu_dereference(tx->sdata->default_unicast_key))) 607 tx->key = key; 608 else 609 tx->key = NULL; 610 611 if (tx->key) { 612 bool skip_hw = false; 613 614 /* TODO: add threshold stuff again */ 615 616 switch (tx->key->conf.cipher) { 617 case WLAN_CIPHER_SUITE_WEP40: 618 case WLAN_CIPHER_SUITE_WEP104: 619 case WLAN_CIPHER_SUITE_TKIP: 620 if (!ieee80211_is_data_present(hdr->frame_control)) 621 tx->key = NULL; 622 break; 623 case WLAN_CIPHER_SUITE_CCMP: 624 case WLAN_CIPHER_SUITE_CCMP_256: 625 case WLAN_CIPHER_SUITE_GCMP: 626 case WLAN_CIPHER_SUITE_GCMP_256: 627 if (!ieee80211_is_data_present(hdr->frame_control) && 628 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 629 tx->skb) && 630 !ieee80211_is_group_privacy_action(tx->skb)) 631 tx->key = NULL; 632 else 633 skip_hw = (tx->key->conf.flags & 634 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 635 ieee80211_is_mgmt(hdr->frame_control); 636 break; 637 case WLAN_CIPHER_SUITE_AES_CMAC: 638 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 640 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 641 if (!ieee80211_is_mgmt(hdr->frame_control)) 642 tx->key = NULL; 643 break; 644 } 645 646 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 647 !ieee80211_is_deauth(hdr->frame_control))) 648 return TX_DROP; 649 650 if (!skip_hw && tx->key && 651 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 652 info->control.hw_key = &tx->key->conf; 653 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 654 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 655 return TX_DROP; 656 } 657 658 return TX_CONTINUE; 659 } 660 661 static ieee80211_tx_result debug_noinline 662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 663 { 664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 665 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 666 struct ieee80211_supported_band *sband; 667 u32 len; 668 struct ieee80211_tx_rate_control txrc; 669 struct ieee80211_sta_rates *ratetbl = NULL; 670 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 671 bool assoc = false; 672 673 memset(&txrc, 0, sizeof(txrc)); 674 675 sband = tx->local->hw.wiphy->bands[info->band]; 676 677 len = min_t(u32, tx->skb->len + FCS_LEN, 678 tx->local->hw.wiphy->frag_threshold); 679 680 /* set up the tx rate control struct we give the RC algo */ 681 txrc.hw = &tx->local->hw; 682 txrc.sband = sband; 683 txrc.bss_conf = &tx->sdata->vif.bss_conf; 684 txrc.skb = tx->skb; 685 txrc.reported_rate.idx = -1; 686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 687 688 if (tx->sdata->rc_has_mcs_mask[info->band]) 689 txrc.rate_idx_mcs_mask = 690 tx->sdata->rc_rateidx_mcs_mask[info->band]; 691 692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 695 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 696 697 /* set up RTS protection if desired */ 698 if (len > tx->local->hw.wiphy->rts_threshold) { 699 txrc.rts = true; 700 } 701 702 info->control.use_rts = txrc.rts; 703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 704 705 /* 706 * Use short preamble if the BSS can handle it, but not for 707 * management frames unless we know the receiver can handle 708 * that -- the management frame might be to a station that 709 * just wants a probe response. 710 */ 711 if (tx->sdata->vif.bss_conf.use_short_preamble && 712 (ieee80211_is_tx_data(tx->skb) || 713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 714 txrc.short_preamble = true; 715 716 info->control.short_preamble = txrc.short_preamble; 717 718 /* don't ask rate control when rate already injected via radiotap */ 719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 720 return TX_CONTINUE; 721 722 if (tx->sta) 723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 724 725 /* 726 * Lets not bother rate control if we're associated and cannot 727 * talk to the sta. This should not happen. 728 */ 729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 730 !rate_usable_index_exists(sband, &tx->sta->sta), 731 "%s: Dropped data frame as no usable bitrate found while " 732 "scanning and associated. Target station: " 733 "%pM on %d GHz band\n", 734 tx->sdata->name, 735 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 736 info->band ? 5 : 2)) 737 return TX_DROP; 738 739 /* 740 * If we're associated with the sta at this point we know we can at 741 * least send the frame at the lowest bit rate. 742 */ 743 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 744 745 if (tx->sta && !info->control.skip_table) 746 ratetbl = rcu_dereference(tx->sta->sta.rates); 747 748 if (unlikely(info->control.rates[0].idx < 0)) { 749 if (ratetbl) { 750 struct ieee80211_tx_rate rate = { 751 .idx = ratetbl->rate[0].idx, 752 .flags = ratetbl->rate[0].flags, 753 .count = ratetbl->rate[0].count 754 }; 755 756 if (ratetbl->rate[0].idx < 0) 757 return TX_DROP; 758 759 tx->rate = rate; 760 } else { 761 return TX_DROP; 762 } 763 } else { 764 tx->rate = info->control.rates[0]; 765 } 766 767 if (txrc.reported_rate.idx < 0) { 768 txrc.reported_rate = tx->rate; 769 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 770 tx->sta->tx_stats.last_rate = txrc.reported_rate; 771 } else if (tx->sta) 772 tx->sta->tx_stats.last_rate = txrc.reported_rate; 773 774 if (ratetbl) 775 return TX_CONTINUE; 776 777 if (unlikely(!info->control.rates[0].count)) 778 info->control.rates[0].count = 1; 779 780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 781 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 782 info->control.rates[0].count = 1; 783 784 return TX_CONTINUE; 785 } 786 787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 788 { 789 u16 *seq = &sta->tid_seq[tid]; 790 __le16 ret = cpu_to_le16(*seq); 791 792 /* Increase the sequence number. */ 793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 794 795 return ret; 796 } 797 798 static ieee80211_tx_result debug_noinline 799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 800 { 801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 803 int tid; 804 805 /* 806 * Packet injection may want to control the sequence 807 * number, if we have no matching interface then we 808 * neither assign one ourselves nor ask the driver to. 809 */ 810 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 811 return TX_CONTINUE; 812 813 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 814 return TX_CONTINUE; 815 816 if (ieee80211_hdrlen(hdr->frame_control) < 24) 817 return TX_CONTINUE; 818 819 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 820 return TX_CONTINUE; 821 822 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 823 return TX_CONTINUE; 824 825 /* 826 * Anything but QoS data that has a sequence number field 827 * (is long enough) gets a sequence number from the global 828 * counter. QoS data frames with a multicast destination 829 * also use the global counter (802.11-2012 9.3.2.10). 830 */ 831 if (!ieee80211_is_data_qos(hdr->frame_control) || 832 is_multicast_ether_addr(hdr->addr1)) { 833 /* driver should assign sequence number */ 834 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 835 /* for pure STA mode without beacons, we can do it */ 836 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 837 tx->sdata->sequence_number += 0x10; 838 if (tx->sta) 839 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 840 return TX_CONTINUE; 841 } 842 843 /* 844 * This should be true for injected/management frames only, for 845 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 846 * above since they are not QoS-data frames. 847 */ 848 if (!tx->sta) 849 return TX_CONTINUE; 850 851 /* include per-STA, per-TID sequence counter */ 852 tid = ieee80211_get_tid(hdr); 853 tx->sta->tx_stats.msdu[tid]++; 854 855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 856 857 return TX_CONTINUE; 858 } 859 860 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 861 struct sk_buff *skb, int hdrlen, 862 int frag_threshold) 863 { 864 struct ieee80211_local *local = tx->local; 865 struct ieee80211_tx_info *info; 866 struct sk_buff *tmp; 867 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 868 int pos = hdrlen + per_fragm; 869 int rem = skb->len - hdrlen - per_fragm; 870 871 if (WARN_ON(rem < 0)) 872 return -EINVAL; 873 874 /* first fragment was already added to queue by caller */ 875 876 while (rem) { 877 int fraglen = per_fragm; 878 879 if (fraglen > rem) 880 fraglen = rem; 881 rem -= fraglen; 882 tmp = dev_alloc_skb(local->tx_headroom + 883 frag_threshold + 884 tx->sdata->encrypt_headroom + 885 IEEE80211_ENCRYPT_TAILROOM); 886 if (!tmp) 887 return -ENOMEM; 888 889 __skb_queue_tail(&tx->skbs, tmp); 890 891 skb_reserve(tmp, 892 local->tx_headroom + tx->sdata->encrypt_headroom); 893 894 /* copy control information */ 895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 896 897 info = IEEE80211_SKB_CB(tmp); 898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 899 IEEE80211_TX_CTL_FIRST_FRAGMENT); 900 901 if (rem) 902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 903 904 skb_copy_queue_mapping(tmp, skb); 905 tmp->priority = skb->priority; 906 tmp->dev = skb->dev; 907 908 /* copy header and data */ 909 skb_put_data(tmp, skb->data, hdrlen); 910 skb_put_data(tmp, skb->data + pos, fraglen); 911 912 pos += fraglen; 913 } 914 915 /* adjust first fragment's length */ 916 skb_trim(skb, hdrlen + per_fragm); 917 return 0; 918 } 919 920 static ieee80211_tx_result debug_noinline 921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 922 { 923 struct sk_buff *skb = tx->skb; 924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 925 struct ieee80211_hdr *hdr = (void *)skb->data; 926 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 927 int hdrlen; 928 int fragnum; 929 930 /* no matter what happens, tx->skb moves to tx->skbs */ 931 __skb_queue_tail(&tx->skbs, skb); 932 tx->skb = NULL; 933 934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 935 return TX_CONTINUE; 936 937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 938 return TX_CONTINUE; 939 940 /* 941 * Warn when submitting a fragmented A-MPDU frame and drop it. 942 * This scenario is handled in ieee80211_tx_prepare but extra 943 * caution taken here as fragmented ampdu may cause Tx stop. 944 */ 945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 946 return TX_DROP; 947 948 hdrlen = ieee80211_hdrlen(hdr->frame_control); 949 950 /* internal error, why isn't DONTFRAG set? */ 951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 952 return TX_DROP; 953 954 /* 955 * Now fragment the frame. This will allocate all the fragments and 956 * chain them (using skb as the first fragment) to skb->next. 957 * During transmission, we will remove the successfully transmitted 958 * fragments from this list. When the low-level driver rejects one 959 * of the fragments then we will simply pretend to accept the skb 960 * but store it away as pending. 961 */ 962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 963 return TX_DROP; 964 965 /* update duration/seq/flags of fragments */ 966 fragnum = 0; 967 968 skb_queue_walk(&tx->skbs, skb) { 969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 970 971 hdr = (void *)skb->data; 972 info = IEEE80211_SKB_CB(skb); 973 974 if (!skb_queue_is_last(&tx->skbs, skb)) { 975 hdr->frame_control |= morefrags; 976 /* 977 * No multi-rate retries for fragmented frames, that 978 * would completely throw off the NAV at other STAs. 979 */ 980 info->control.rates[1].idx = -1; 981 info->control.rates[2].idx = -1; 982 info->control.rates[3].idx = -1; 983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 985 } else { 986 hdr->frame_control &= ~morefrags; 987 } 988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 989 fragnum++; 990 } 991 992 return TX_CONTINUE; 993 } 994 995 static ieee80211_tx_result debug_noinline 996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 997 { 998 struct sk_buff *skb; 999 int ac = -1; 1000 1001 if (!tx->sta) 1002 return TX_CONTINUE; 1003 1004 skb_queue_walk(&tx->skbs, skb) { 1005 ac = skb_get_queue_mapping(skb); 1006 tx->sta->tx_stats.bytes[ac] += skb->len; 1007 } 1008 if (ac >= 0) 1009 tx->sta->tx_stats.packets[ac]++; 1010 1011 return TX_CONTINUE; 1012 } 1013 1014 static ieee80211_tx_result debug_noinline 1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1016 { 1017 if (!tx->key) 1018 return TX_CONTINUE; 1019 1020 switch (tx->key->conf.cipher) { 1021 case WLAN_CIPHER_SUITE_WEP40: 1022 case WLAN_CIPHER_SUITE_WEP104: 1023 return ieee80211_crypto_wep_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_TKIP: 1025 return ieee80211_crypto_tkip_encrypt(tx); 1026 case WLAN_CIPHER_SUITE_CCMP: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_CCMP_256: 1030 return ieee80211_crypto_ccmp_encrypt( 1031 tx, IEEE80211_CCMP_256_MIC_LEN); 1032 case WLAN_CIPHER_SUITE_AES_CMAC: 1033 return ieee80211_crypto_aes_cmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1038 return ieee80211_crypto_aes_gmac_encrypt(tx); 1039 case WLAN_CIPHER_SUITE_GCMP: 1040 case WLAN_CIPHER_SUITE_GCMP_256: 1041 return ieee80211_crypto_gcmp_encrypt(tx); 1042 default: 1043 return ieee80211_crypto_hw_encrypt(tx); 1044 } 1045 1046 return TX_DROP; 1047 } 1048 1049 static ieee80211_tx_result debug_noinline 1050 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1051 { 1052 struct sk_buff *skb; 1053 struct ieee80211_hdr *hdr; 1054 int next_len; 1055 bool group_addr; 1056 1057 skb_queue_walk(&tx->skbs, skb) { 1058 hdr = (void *) skb->data; 1059 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1060 break; /* must not overwrite AID */ 1061 if (!skb_queue_is_last(&tx->skbs, skb)) { 1062 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1063 next_len = next->len; 1064 } else 1065 next_len = 0; 1066 group_addr = is_multicast_ether_addr(hdr->addr1); 1067 1068 hdr->duration_id = 1069 ieee80211_duration(tx, skb, group_addr, next_len); 1070 } 1071 1072 return TX_CONTINUE; 1073 } 1074 1075 /* actual transmit path */ 1076 1077 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1078 struct sk_buff *skb, 1079 struct ieee80211_tx_info *info, 1080 struct tid_ampdu_tx *tid_tx, 1081 int tid) 1082 { 1083 bool queued = false; 1084 bool reset_agg_timer = false; 1085 struct sk_buff *purge_skb = NULL; 1086 1087 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1088 info->flags |= IEEE80211_TX_CTL_AMPDU; 1089 reset_agg_timer = true; 1090 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1091 /* 1092 * nothing -- this aggregation session is being started 1093 * but that might still fail with the driver 1094 */ 1095 } else if (!tx->sta->sta.txq[tid]) { 1096 spin_lock(&tx->sta->lock); 1097 /* 1098 * Need to re-check now, because we may get here 1099 * 1100 * 1) in the window during which the setup is actually 1101 * already done, but not marked yet because not all 1102 * packets are spliced over to the driver pending 1103 * queue yet -- if this happened we acquire the lock 1104 * either before or after the splice happens, but 1105 * need to recheck which of these cases happened. 1106 * 1107 * 2) during session teardown, if the OPERATIONAL bit 1108 * was cleared due to the teardown but the pointer 1109 * hasn't been assigned NULL yet (or we loaded it 1110 * before it was assigned) -- in this case it may 1111 * now be NULL which means we should just let the 1112 * packet pass through because splicing the frames 1113 * back is already done. 1114 */ 1115 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1116 1117 if (!tid_tx) { 1118 /* do nothing, let packet pass through */ 1119 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1120 info->flags |= IEEE80211_TX_CTL_AMPDU; 1121 reset_agg_timer = true; 1122 } else { 1123 queued = true; 1124 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1125 clear_sta_flag(tx->sta, WLAN_STA_SP); 1126 ps_dbg(tx->sta->sdata, 1127 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1128 tx->sta->sta.addr, tx->sta->sta.aid); 1129 } 1130 info->control.vif = &tx->sdata->vif; 1131 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1132 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1133 __skb_queue_tail(&tid_tx->pending, skb); 1134 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1135 purge_skb = __skb_dequeue(&tid_tx->pending); 1136 } 1137 spin_unlock(&tx->sta->lock); 1138 1139 if (purge_skb) 1140 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1141 } 1142 1143 /* reset session timer */ 1144 if (reset_agg_timer) 1145 tid_tx->last_tx = jiffies; 1146 1147 return queued; 1148 } 1149 1150 static void 1151 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1152 struct sta_info *sta, 1153 struct sk_buff *skb) 1154 { 1155 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1156 u16 tid; 1157 1158 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1159 return; 1160 1161 if (!sta || !sta->sta.ht_cap.ht_supported || 1162 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1163 skb->protocol == sdata->control_port_protocol) 1164 return; 1165 1166 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1167 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1168 return; 1169 1170 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1171 } 1172 1173 /* 1174 * initialises @tx 1175 * pass %NULL for the station if unknown, a valid pointer if known 1176 * or an ERR_PTR() if the station is known not to exist 1177 */ 1178 static ieee80211_tx_result 1179 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1180 struct ieee80211_tx_data *tx, 1181 struct sta_info *sta, struct sk_buff *skb) 1182 { 1183 struct ieee80211_local *local = sdata->local; 1184 struct ieee80211_hdr *hdr; 1185 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1186 bool aggr_check = false; 1187 int tid; 1188 1189 memset(tx, 0, sizeof(*tx)); 1190 tx->skb = skb; 1191 tx->local = local; 1192 tx->sdata = sdata; 1193 __skb_queue_head_init(&tx->skbs); 1194 1195 /* 1196 * If this flag is set to true anywhere, and we get here, 1197 * we are doing the needed processing, so remove the flag 1198 * now. 1199 */ 1200 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1201 1202 hdr = (struct ieee80211_hdr *) skb->data; 1203 1204 if (likely(sta)) { 1205 if (!IS_ERR(sta)) 1206 tx->sta = sta; 1207 } else { 1208 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1209 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1210 if (!tx->sta && sdata->wdev.use_4addr) 1211 return TX_DROP; 1212 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1213 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1214 } 1215 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1216 tx->sta = sta_info_get(sdata, hdr->addr1); 1217 aggr_check = true; 1218 } 1219 } 1220 1221 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1222 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1223 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1224 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1225 struct tid_ampdu_tx *tid_tx; 1226 1227 tid = ieee80211_get_tid(hdr); 1228 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1229 if (!tid_tx && aggr_check) { 1230 ieee80211_aggr_check(sdata, tx->sta, skb); 1231 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1232 } 1233 1234 if (tid_tx) { 1235 bool queued; 1236 1237 queued = ieee80211_tx_prep_agg(tx, skb, info, 1238 tid_tx, tid); 1239 1240 if (unlikely(queued)) 1241 return TX_QUEUED; 1242 } 1243 } 1244 1245 if (is_multicast_ether_addr(hdr->addr1)) { 1246 tx->flags &= ~IEEE80211_TX_UNICAST; 1247 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1248 } else 1249 tx->flags |= IEEE80211_TX_UNICAST; 1250 1251 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1252 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1253 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1254 info->flags & IEEE80211_TX_CTL_AMPDU) 1255 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1256 } 1257 1258 if (!tx->sta) 1259 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1260 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1261 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1262 ieee80211_check_fast_xmit(tx->sta); 1263 } 1264 1265 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1266 1267 return TX_CONTINUE; 1268 } 1269 1270 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1271 struct ieee80211_vif *vif, 1272 struct sta_info *sta, 1273 struct sk_buff *skb) 1274 { 1275 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1276 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1277 struct ieee80211_txq *txq = NULL; 1278 1279 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1280 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1281 return NULL; 1282 1283 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1284 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1285 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1286 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1287 vif->type == NL80211_IFTYPE_STATION) && 1288 sta && sta->uploaded) { 1289 /* 1290 * This will be NULL if the driver didn't set the 1291 * opt-in hardware flag. 1292 */ 1293 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1294 } 1295 } else if (sta) { 1296 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1297 1298 if (!sta->uploaded) 1299 return NULL; 1300 1301 txq = sta->sta.txq[tid]; 1302 } else if (vif) { 1303 txq = vif->txq; 1304 } 1305 1306 if (!txq) 1307 return NULL; 1308 1309 return to_txq_info(txq); 1310 } 1311 1312 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1313 { 1314 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1315 } 1316 1317 static u32 codel_skb_len_func(const struct sk_buff *skb) 1318 { 1319 return skb->len; 1320 } 1321 1322 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1323 { 1324 const struct ieee80211_tx_info *info; 1325 1326 info = (const struct ieee80211_tx_info *)skb->cb; 1327 return info->control.enqueue_time; 1328 } 1329 1330 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1331 void *ctx) 1332 { 1333 struct ieee80211_local *local; 1334 struct txq_info *txqi; 1335 struct fq *fq; 1336 struct fq_flow *flow; 1337 1338 txqi = ctx; 1339 local = vif_to_sdata(txqi->txq.vif)->local; 1340 fq = &local->fq; 1341 1342 if (cvars == &txqi->def_cvars) 1343 flow = &txqi->tin.default_flow; 1344 else 1345 flow = &fq->flows[cvars - local->cvars]; 1346 1347 return fq_flow_dequeue(fq, flow); 1348 } 1349 1350 static void codel_drop_func(struct sk_buff *skb, 1351 void *ctx) 1352 { 1353 struct ieee80211_local *local; 1354 struct ieee80211_hw *hw; 1355 struct txq_info *txqi; 1356 1357 txqi = ctx; 1358 local = vif_to_sdata(txqi->txq.vif)->local; 1359 hw = &local->hw; 1360 1361 ieee80211_free_txskb(hw, skb); 1362 } 1363 1364 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1365 struct fq_tin *tin, 1366 struct fq_flow *flow) 1367 { 1368 struct ieee80211_local *local; 1369 struct txq_info *txqi; 1370 struct codel_vars *cvars; 1371 struct codel_params *cparams; 1372 struct codel_stats *cstats; 1373 1374 local = container_of(fq, struct ieee80211_local, fq); 1375 txqi = container_of(tin, struct txq_info, tin); 1376 cstats = &txqi->cstats; 1377 1378 if (txqi->txq.sta) { 1379 struct sta_info *sta = container_of(txqi->txq.sta, 1380 struct sta_info, sta); 1381 cparams = &sta->cparams; 1382 } else { 1383 cparams = &local->cparams; 1384 } 1385 1386 if (flow == &tin->default_flow) 1387 cvars = &txqi->def_cvars; 1388 else 1389 cvars = &local->cvars[flow - fq->flows]; 1390 1391 return codel_dequeue(txqi, 1392 &flow->backlog, 1393 cparams, 1394 cvars, 1395 cstats, 1396 codel_skb_len_func, 1397 codel_skb_time_func, 1398 codel_drop_func, 1399 codel_dequeue_func); 1400 } 1401 1402 static void fq_skb_free_func(struct fq *fq, 1403 struct fq_tin *tin, 1404 struct fq_flow *flow, 1405 struct sk_buff *skb) 1406 { 1407 struct ieee80211_local *local; 1408 1409 local = container_of(fq, struct ieee80211_local, fq); 1410 ieee80211_free_txskb(&local->hw, skb); 1411 } 1412 1413 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1414 struct txq_info *txqi, 1415 struct sk_buff *skb) 1416 { 1417 struct fq *fq = &local->fq; 1418 struct fq_tin *tin = &txqi->tin; 1419 u32 flow_idx = fq_flow_idx(fq, skb); 1420 1421 ieee80211_set_skb_enqueue_time(skb); 1422 1423 spin_lock_bh(&fq->lock); 1424 /* 1425 * For management frames, don't really apply codel etc., 1426 * we don't want to apply any shaping or anything we just 1427 * want to simplify the driver API by having them on the 1428 * txqi. 1429 */ 1430 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1431 IEEE80211_SKB_CB(skb)->control.flags |= 1432 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1433 __skb_queue_tail(&txqi->frags, skb); 1434 } else { 1435 fq_tin_enqueue(fq, tin, flow_idx, skb, 1436 fq_skb_free_func); 1437 } 1438 spin_unlock_bh(&fq->lock); 1439 } 1440 1441 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1442 struct fq_flow *flow, struct sk_buff *skb, 1443 void *data) 1444 { 1445 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1446 1447 return info->control.vif == data; 1448 } 1449 1450 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1451 struct ieee80211_sub_if_data *sdata) 1452 { 1453 struct fq *fq = &local->fq; 1454 struct txq_info *txqi; 1455 struct fq_tin *tin; 1456 struct ieee80211_sub_if_data *ap; 1457 1458 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1459 return; 1460 1461 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1462 1463 if (!ap->vif.txq) 1464 return; 1465 1466 txqi = to_txq_info(ap->vif.txq); 1467 tin = &txqi->tin; 1468 1469 spin_lock_bh(&fq->lock); 1470 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1471 fq_skb_free_func); 1472 spin_unlock_bh(&fq->lock); 1473 } 1474 1475 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1476 struct sta_info *sta, 1477 struct txq_info *txqi, int tid) 1478 { 1479 fq_tin_init(&txqi->tin); 1480 codel_vars_init(&txqi->def_cvars); 1481 codel_stats_init(&txqi->cstats); 1482 __skb_queue_head_init(&txqi->frags); 1483 RB_CLEAR_NODE(&txqi->schedule_order); 1484 1485 txqi->txq.vif = &sdata->vif; 1486 1487 if (!sta) { 1488 sdata->vif.txq = &txqi->txq; 1489 txqi->txq.tid = 0; 1490 txqi->txq.ac = IEEE80211_AC_BE; 1491 1492 return; 1493 } 1494 1495 if (tid == IEEE80211_NUM_TIDS) { 1496 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1497 /* Drivers need to opt in to the management MPDU TXQ */ 1498 if (!ieee80211_hw_check(&sdata->local->hw, 1499 STA_MMPDU_TXQ)) 1500 return; 1501 } else if (!ieee80211_hw_check(&sdata->local->hw, 1502 BUFF_MMPDU_TXQ)) { 1503 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1504 return; 1505 } 1506 txqi->txq.ac = IEEE80211_AC_VO; 1507 } else { 1508 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1509 } 1510 1511 txqi->txq.sta = &sta->sta; 1512 txqi->txq.tid = tid; 1513 sta->sta.txq[tid] = &txqi->txq; 1514 } 1515 1516 void ieee80211_txq_purge(struct ieee80211_local *local, 1517 struct txq_info *txqi) 1518 { 1519 struct fq *fq = &local->fq; 1520 struct fq_tin *tin = &txqi->tin; 1521 1522 spin_lock_bh(&fq->lock); 1523 fq_tin_reset(fq, tin, fq_skb_free_func); 1524 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1525 spin_unlock_bh(&fq->lock); 1526 1527 ieee80211_unschedule_txq(&local->hw, &txqi->txq, true); 1528 } 1529 1530 void ieee80211_txq_set_params(struct ieee80211_local *local) 1531 { 1532 if (local->hw.wiphy->txq_limit) 1533 local->fq.limit = local->hw.wiphy->txq_limit; 1534 else 1535 local->hw.wiphy->txq_limit = local->fq.limit; 1536 1537 if (local->hw.wiphy->txq_memory_limit) 1538 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1539 else 1540 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1541 1542 if (local->hw.wiphy->txq_quantum) 1543 local->fq.quantum = local->hw.wiphy->txq_quantum; 1544 else 1545 local->hw.wiphy->txq_quantum = local->fq.quantum; 1546 } 1547 1548 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1549 { 1550 struct fq *fq = &local->fq; 1551 int ret; 1552 int i; 1553 bool supp_vht = false; 1554 enum nl80211_band band; 1555 1556 if (!local->ops->wake_tx_queue) 1557 return 0; 1558 1559 ret = fq_init(fq, 4096); 1560 if (ret) 1561 return ret; 1562 1563 /* 1564 * If the hardware doesn't support VHT, it is safe to limit the maximum 1565 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1566 */ 1567 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1568 struct ieee80211_supported_band *sband; 1569 1570 sband = local->hw.wiphy->bands[band]; 1571 if (!sband) 1572 continue; 1573 1574 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1575 } 1576 1577 if (!supp_vht) 1578 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1579 1580 codel_params_init(&local->cparams); 1581 local->cparams.interval = MS2TIME(100); 1582 local->cparams.target = MS2TIME(20); 1583 local->cparams.ecn = true; 1584 1585 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1586 GFP_KERNEL); 1587 if (!local->cvars) { 1588 spin_lock_bh(&fq->lock); 1589 fq_reset(fq, fq_skb_free_func); 1590 spin_unlock_bh(&fq->lock); 1591 return -ENOMEM; 1592 } 1593 1594 for (i = 0; i < fq->flows_cnt; i++) 1595 codel_vars_init(&local->cvars[i]); 1596 1597 ieee80211_txq_set_params(local); 1598 1599 return 0; 1600 } 1601 1602 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1603 { 1604 struct fq *fq = &local->fq; 1605 1606 if (!local->ops->wake_tx_queue) 1607 return; 1608 1609 kfree(local->cvars); 1610 local->cvars = NULL; 1611 1612 spin_lock_bh(&fq->lock); 1613 fq_reset(fq, fq_skb_free_func); 1614 spin_unlock_bh(&fq->lock); 1615 } 1616 1617 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1618 struct ieee80211_sub_if_data *sdata, 1619 struct sta_info *sta, 1620 struct sk_buff *skb) 1621 { 1622 struct ieee80211_vif *vif; 1623 struct txq_info *txqi; 1624 1625 if (!local->ops->wake_tx_queue || 1626 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1627 return false; 1628 1629 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1630 sdata = container_of(sdata->bss, 1631 struct ieee80211_sub_if_data, u.ap); 1632 1633 vif = &sdata->vif; 1634 txqi = ieee80211_get_txq(local, vif, sta, skb); 1635 1636 if (!txqi) 1637 return false; 1638 1639 ieee80211_txq_enqueue(local, txqi, skb); 1640 1641 schedule_and_wake_txq(local, txqi); 1642 1643 return true; 1644 } 1645 1646 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1647 struct ieee80211_vif *vif, 1648 struct sta_info *sta, 1649 struct sk_buff_head *skbs, 1650 bool txpending) 1651 { 1652 struct ieee80211_tx_control control = {}; 1653 struct sk_buff *skb, *tmp; 1654 unsigned long flags; 1655 1656 skb_queue_walk_safe(skbs, skb, tmp) { 1657 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1658 int q = info->hw_queue; 1659 1660 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1661 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1662 __skb_unlink(skb, skbs); 1663 ieee80211_free_txskb(&local->hw, skb); 1664 continue; 1665 } 1666 #endif 1667 1668 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1669 if (local->queue_stop_reasons[q] || 1670 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1671 if (unlikely(info->flags & 1672 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1673 if (local->queue_stop_reasons[q] & 1674 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1675 /* 1676 * Drop off-channel frames if queues 1677 * are stopped for any reason other 1678 * than off-channel operation. Never 1679 * queue them. 1680 */ 1681 spin_unlock_irqrestore( 1682 &local->queue_stop_reason_lock, 1683 flags); 1684 ieee80211_purge_tx_queue(&local->hw, 1685 skbs); 1686 return true; 1687 } 1688 } else { 1689 1690 /* 1691 * Since queue is stopped, queue up frames for 1692 * later transmission from the tx-pending 1693 * tasklet when the queue is woken again. 1694 */ 1695 if (txpending) 1696 skb_queue_splice_init(skbs, 1697 &local->pending[q]); 1698 else 1699 skb_queue_splice_tail_init(skbs, 1700 &local->pending[q]); 1701 1702 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1703 flags); 1704 return false; 1705 } 1706 } 1707 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1708 1709 info->control.vif = vif; 1710 control.sta = sta ? &sta->sta : NULL; 1711 1712 __skb_unlink(skb, skbs); 1713 drv_tx(local, &control, skb); 1714 } 1715 1716 return true; 1717 } 1718 1719 /* 1720 * Returns false if the frame couldn't be transmitted but was queued instead. 1721 */ 1722 static bool __ieee80211_tx(struct ieee80211_local *local, 1723 struct sk_buff_head *skbs, int led_len, 1724 struct sta_info *sta, bool txpending) 1725 { 1726 struct ieee80211_tx_info *info; 1727 struct ieee80211_sub_if_data *sdata; 1728 struct ieee80211_vif *vif; 1729 struct sk_buff *skb; 1730 bool result; 1731 __le16 fc; 1732 1733 if (WARN_ON(skb_queue_empty(skbs))) 1734 return true; 1735 1736 skb = skb_peek(skbs); 1737 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1738 info = IEEE80211_SKB_CB(skb); 1739 sdata = vif_to_sdata(info->control.vif); 1740 if (sta && !sta->uploaded) 1741 sta = NULL; 1742 1743 switch (sdata->vif.type) { 1744 case NL80211_IFTYPE_MONITOR: 1745 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1746 vif = &sdata->vif; 1747 break; 1748 } 1749 sdata = rcu_dereference(local->monitor_sdata); 1750 if (sdata) { 1751 vif = &sdata->vif; 1752 info->hw_queue = 1753 vif->hw_queue[skb_get_queue_mapping(skb)]; 1754 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1755 ieee80211_purge_tx_queue(&local->hw, skbs); 1756 return true; 1757 } else 1758 vif = NULL; 1759 break; 1760 case NL80211_IFTYPE_AP_VLAN: 1761 sdata = container_of(sdata->bss, 1762 struct ieee80211_sub_if_data, u.ap); 1763 fallthrough; 1764 default: 1765 vif = &sdata->vif; 1766 break; 1767 } 1768 1769 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1770 1771 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1772 1773 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1774 1775 return result; 1776 } 1777 1778 /* 1779 * Invoke TX handlers, return 0 on success and non-zero if the 1780 * frame was dropped or queued. 1781 * 1782 * The handlers are split into an early and late part. The latter is everything 1783 * that can be sensitive to reordering, and will be deferred to after packets 1784 * are dequeued from the intermediate queues (when they are enabled). 1785 */ 1786 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1787 { 1788 ieee80211_tx_result res = TX_DROP; 1789 1790 #define CALL_TXH(txh) \ 1791 do { \ 1792 res = txh(tx); \ 1793 if (res != TX_CONTINUE) \ 1794 goto txh_done; \ 1795 } while (0) 1796 1797 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1798 CALL_TXH(ieee80211_tx_h_check_assoc); 1799 CALL_TXH(ieee80211_tx_h_ps_buf); 1800 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1801 CALL_TXH(ieee80211_tx_h_select_key); 1802 1803 txh_done: 1804 if (unlikely(res == TX_DROP)) { 1805 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1806 if (tx->skb) 1807 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1808 else 1809 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1810 return -1; 1811 } else if (unlikely(res == TX_QUEUED)) { 1812 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1813 return -1; 1814 } 1815 1816 return 0; 1817 } 1818 1819 /* 1820 * Late handlers can be called while the sta lock is held. Handlers that can 1821 * cause packets to be generated will cause deadlock! 1822 */ 1823 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1824 { 1825 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1826 ieee80211_tx_result res = TX_CONTINUE; 1827 1828 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1829 __skb_queue_tail(&tx->skbs, tx->skb); 1830 tx->skb = NULL; 1831 goto txh_done; 1832 } 1833 1834 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1835 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1836 1837 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1838 CALL_TXH(ieee80211_tx_h_sequence); 1839 CALL_TXH(ieee80211_tx_h_fragment); 1840 /* handlers after fragment must be aware of tx info fragmentation! */ 1841 CALL_TXH(ieee80211_tx_h_stats); 1842 CALL_TXH(ieee80211_tx_h_encrypt); 1843 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1844 CALL_TXH(ieee80211_tx_h_calculate_duration); 1845 #undef CALL_TXH 1846 1847 txh_done: 1848 if (unlikely(res == TX_DROP)) { 1849 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1850 if (tx->skb) 1851 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1852 else 1853 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1854 return -1; 1855 } else if (unlikely(res == TX_QUEUED)) { 1856 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1857 return -1; 1858 } 1859 1860 return 0; 1861 } 1862 1863 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1864 { 1865 int r = invoke_tx_handlers_early(tx); 1866 1867 if (r) 1868 return r; 1869 return invoke_tx_handlers_late(tx); 1870 } 1871 1872 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1873 struct ieee80211_vif *vif, struct sk_buff *skb, 1874 int band, struct ieee80211_sta **sta) 1875 { 1876 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1877 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1878 struct ieee80211_tx_data tx; 1879 struct sk_buff *skb2; 1880 1881 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1882 return false; 1883 1884 info->band = band; 1885 info->control.vif = vif; 1886 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1887 1888 if (invoke_tx_handlers(&tx)) 1889 return false; 1890 1891 if (sta) { 1892 if (tx.sta) 1893 *sta = &tx.sta->sta; 1894 else 1895 *sta = NULL; 1896 } 1897 1898 /* this function isn't suitable for fragmented data frames */ 1899 skb2 = __skb_dequeue(&tx.skbs); 1900 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1901 ieee80211_free_txskb(hw, skb2); 1902 ieee80211_purge_tx_queue(hw, &tx.skbs); 1903 return false; 1904 } 1905 1906 return true; 1907 } 1908 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1909 1910 /* 1911 * Returns false if the frame couldn't be transmitted but was queued instead. 1912 */ 1913 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1914 struct sta_info *sta, struct sk_buff *skb, 1915 bool txpending) 1916 { 1917 struct ieee80211_local *local = sdata->local; 1918 struct ieee80211_tx_data tx; 1919 ieee80211_tx_result res_prepare; 1920 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1921 bool result = true; 1922 int led_len; 1923 1924 if (unlikely(skb->len < 10)) { 1925 dev_kfree_skb(skb); 1926 return true; 1927 } 1928 1929 /* initialises tx */ 1930 led_len = skb->len; 1931 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1932 1933 if (unlikely(res_prepare == TX_DROP)) { 1934 ieee80211_free_txskb(&local->hw, skb); 1935 return true; 1936 } else if (unlikely(res_prepare == TX_QUEUED)) { 1937 return true; 1938 } 1939 1940 /* set up hw_queue value early */ 1941 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1942 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1943 info->hw_queue = 1944 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1945 1946 if (invoke_tx_handlers_early(&tx)) 1947 return true; 1948 1949 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1950 return true; 1951 1952 if (!invoke_tx_handlers_late(&tx)) 1953 result = __ieee80211_tx(local, &tx.skbs, led_len, 1954 tx.sta, txpending); 1955 1956 return result; 1957 } 1958 1959 /* device xmit handlers */ 1960 1961 enum ieee80211_encrypt { 1962 ENCRYPT_NO, 1963 ENCRYPT_MGMT, 1964 ENCRYPT_DATA, 1965 }; 1966 1967 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1968 struct sk_buff *skb, 1969 int head_need, 1970 enum ieee80211_encrypt encrypt) 1971 { 1972 struct ieee80211_local *local = sdata->local; 1973 bool enc_tailroom; 1974 int tail_need = 0; 1975 1976 enc_tailroom = encrypt == ENCRYPT_MGMT || 1977 (encrypt == ENCRYPT_DATA && 1978 sdata->crypto_tx_tailroom_needed_cnt); 1979 1980 if (enc_tailroom) { 1981 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1982 tail_need -= skb_tailroom(skb); 1983 tail_need = max_t(int, tail_need, 0); 1984 } 1985 1986 if (skb_cloned(skb) && 1987 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1988 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1989 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1990 else if (head_need || tail_need) 1991 I802_DEBUG_INC(local->tx_expand_skb_head); 1992 else 1993 return 0; 1994 1995 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1996 wiphy_debug(local->hw.wiphy, 1997 "failed to reallocate TX buffer\n"); 1998 return -ENOMEM; 1999 } 2000 2001 return 0; 2002 } 2003 2004 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2005 struct sta_info *sta, struct sk_buff *skb) 2006 { 2007 struct ieee80211_local *local = sdata->local; 2008 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2009 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2010 int headroom; 2011 enum ieee80211_encrypt encrypt; 2012 2013 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2014 encrypt = ENCRYPT_NO; 2015 else if (ieee80211_is_mgmt(hdr->frame_control)) 2016 encrypt = ENCRYPT_MGMT; 2017 else 2018 encrypt = ENCRYPT_DATA; 2019 2020 headroom = local->tx_headroom; 2021 if (encrypt != ENCRYPT_NO) 2022 headroom += sdata->encrypt_headroom; 2023 headroom -= skb_headroom(skb); 2024 headroom = max_t(int, 0, headroom); 2025 2026 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2027 ieee80211_free_txskb(&local->hw, skb); 2028 return; 2029 } 2030 2031 /* reload after potential resize */ 2032 hdr = (struct ieee80211_hdr *) skb->data; 2033 info->control.vif = &sdata->vif; 2034 2035 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2036 if (ieee80211_is_data(hdr->frame_control) && 2037 is_unicast_ether_addr(hdr->addr1)) { 2038 if (mesh_nexthop_resolve(sdata, skb)) 2039 return; /* skb queued: don't free */ 2040 } else { 2041 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2042 } 2043 } 2044 2045 ieee80211_set_qos_hdr(sdata, skb); 2046 ieee80211_tx(sdata, sta, skb, false); 2047 } 2048 2049 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2050 { 2051 struct ieee80211_radiotap_header *rthdr = 2052 (struct ieee80211_radiotap_header *)skb->data; 2053 2054 /* check for not even having the fixed radiotap header part */ 2055 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2056 return false; /* too short to be possibly valid */ 2057 2058 /* is it a header version we can trust to find length from? */ 2059 if (unlikely(rthdr->it_version)) 2060 return false; /* only version 0 is supported */ 2061 2062 /* does the skb contain enough to deliver on the alleged length? */ 2063 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2064 return false; /* skb too short for claimed rt header extent */ 2065 2066 return true; 2067 } 2068 2069 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2070 struct net_device *dev) 2071 { 2072 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2073 struct ieee80211_radiotap_iterator iterator; 2074 struct ieee80211_radiotap_header *rthdr = 2075 (struct ieee80211_radiotap_header *) skb->data; 2076 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2077 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2078 NULL); 2079 u16 txflags; 2080 u16 rate = 0; 2081 bool rate_found = false; 2082 u8 rate_retries = 0; 2083 u16 rate_flags = 0; 2084 u8 mcs_known, mcs_flags, mcs_bw; 2085 u16 vht_known; 2086 u8 vht_mcs = 0, vht_nss = 0; 2087 int i; 2088 2089 if (!ieee80211_validate_radiotap_len(skb)) 2090 return false; 2091 2092 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2093 IEEE80211_TX_CTL_DONTFRAG; 2094 2095 /* 2096 * for every radiotap entry that is present 2097 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2098 * entries present, or -EINVAL on error) 2099 */ 2100 2101 while (!ret) { 2102 ret = ieee80211_radiotap_iterator_next(&iterator); 2103 2104 if (ret) 2105 continue; 2106 2107 /* see if this argument is something we can use */ 2108 switch (iterator.this_arg_index) { 2109 /* 2110 * You must take care when dereferencing iterator.this_arg 2111 * for multibyte types... the pointer is not aligned. Use 2112 * get_unaligned((type *)iterator.this_arg) to dereference 2113 * iterator.this_arg for type "type" safely on all arches. 2114 */ 2115 case IEEE80211_RADIOTAP_FLAGS: 2116 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2117 /* 2118 * this indicates that the skb we have been 2119 * handed has the 32-bit FCS CRC at the end... 2120 * we should react to that by snipping it off 2121 * because it will be recomputed and added 2122 * on transmission 2123 */ 2124 if (skb->len < (iterator._max_length + FCS_LEN)) 2125 return false; 2126 2127 skb_trim(skb, skb->len - FCS_LEN); 2128 } 2129 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2130 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2131 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2132 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2133 break; 2134 2135 case IEEE80211_RADIOTAP_TX_FLAGS: 2136 txflags = get_unaligned_le16(iterator.this_arg); 2137 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2138 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2139 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2140 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2141 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2142 info->control.flags |= 2143 IEEE80211_TX_CTRL_DONT_REORDER; 2144 break; 2145 2146 case IEEE80211_RADIOTAP_RATE: 2147 rate = *iterator.this_arg; 2148 rate_flags = 0; 2149 rate_found = true; 2150 break; 2151 2152 case IEEE80211_RADIOTAP_DATA_RETRIES: 2153 rate_retries = *iterator.this_arg; 2154 break; 2155 2156 case IEEE80211_RADIOTAP_MCS: 2157 mcs_known = iterator.this_arg[0]; 2158 mcs_flags = iterator.this_arg[1]; 2159 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2160 break; 2161 2162 rate_found = true; 2163 rate = iterator.this_arg[2]; 2164 rate_flags = IEEE80211_TX_RC_MCS; 2165 2166 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2167 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2168 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2169 2170 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2171 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2172 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2173 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2174 2175 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2176 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2177 info->flags |= IEEE80211_TX_CTL_LDPC; 2178 2179 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2180 u8 stbc = u8_get_bits(mcs_flags, 2181 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2182 2183 info->flags |= 2184 u32_encode_bits(stbc, 2185 IEEE80211_TX_CTL_STBC); 2186 } 2187 break; 2188 2189 case IEEE80211_RADIOTAP_VHT: 2190 vht_known = get_unaligned_le16(iterator.this_arg); 2191 rate_found = true; 2192 2193 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2194 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2195 (iterator.this_arg[2] & 2196 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2197 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2198 if (vht_known & 2199 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2200 if (iterator.this_arg[3] == 1) 2201 rate_flags |= 2202 IEEE80211_TX_RC_40_MHZ_WIDTH; 2203 else if (iterator.this_arg[3] == 4) 2204 rate_flags |= 2205 IEEE80211_TX_RC_80_MHZ_WIDTH; 2206 else if (iterator.this_arg[3] == 11) 2207 rate_flags |= 2208 IEEE80211_TX_RC_160_MHZ_WIDTH; 2209 } 2210 2211 vht_mcs = iterator.this_arg[4] >> 4; 2212 vht_nss = iterator.this_arg[4] & 0xF; 2213 break; 2214 2215 /* 2216 * Please update the file 2217 * Documentation/networking/mac80211-injection.rst 2218 * when parsing new fields here. 2219 */ 2220 2221 default: 2222 break; 2223 } 2224 } 2225 2226 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2227 return false; 2228 2229 if (rate_found) { 2230 struct ieee80211_supported_band *sband = 2231 local->hw.wiphy->bands[info->band]; 2232 2233 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2234 2235 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2236 info->control.rates[i].idx = -1; 2237 info->control.rates[i].flags = 0; 2238 info->control.rates[i].count = 0; 2239 } 2240 2241 if (rate_flags & IEEE80211_TX_RC_MCS) { 2242 info->control.rates[0].idx = rate; 2243 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2244 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2245 vht_nss); 2246 } else if (sband) { 2247 for (i = 0; i < sband->n_bitrates; i++) { 2248 if (rate * 5 != sband->bitrates[i].bitrate) 2249 continue; 2250 2251 info->control.rates[0].idx = i; 2252 break; 2253 } 2254 } 2255 2256 if (info->control.rates[0].idx < 0) 2257 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2258 2259 info->control.rates[0].flags = rate_flags; 2260 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2261 local->hw.max_rate_tries); 2262 } 2263 2264 return true; 2265 } 2266 2267 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2268 struct net_device *dev) 2269 { 2270 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2271 struct ieee80211_chanctx_conf *chanctx_conf; 2272 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2273 struct ieee80211_hdr *hdr; 2274 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2275 struct cfg80211_chan_def *chandef; 2276 u16 len_rthdr; 2277 int hdrlen; 2278 2279 memset(info, 0, sizeof(*info)); 2280 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2281 IEEE80211_TX_CTL_INJECTED; 2282 2283 /* Sanity-check the length of the radiotap header */ 2284 if (!ieee80211_validate_radiotap_len(skb)) 2285 goto fail; 2286 2287 /* we now know there is a radiotap header with a length we can use */ 2288 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2289 2290 /* 2291 * fix up the pointers accounting for the radiotap 2292 * header still being in there. We are being given 2293 * a precooked IEEE80211 header so no need for 2294 * normal processing 2295 */ 2296 skb_set_mac_header(skb, len_rthdr); 2297 /* 2298 * these are just fixed to the end of the rt area since we 2299 * don't have any better information and at this point, nobody cares 2300 */ 2301 skb_set_network_header(skb, len_rthdr); 2302 skb_set_transport_header(skb, len_rthdr); 2303 2304 if (skb->len < len_rthdr + 2) 2305 goto fail; 2306 2307 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2308 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2309 2310 if (skb->len < len_rthdr + hdrlen) 2311 goto fail; 2312 2313 /* 2314 * Initialize skb->protocol if the injected frame is a data frame 2315 * carrying a rfc1042 header 2316 */ 2317 if (ieee80211_is_data(hdr->frame_control) && 2318 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2319 u8 *payload = (u8 *)hdr + hdrlen; 2320 2321 if (ether_addr_equal(payload, rfc1042_header)) 2322 skb->protocol = cpu_to_be16((payload[6] << 8) | 2323 payload[7]); 2324 } 2325 2326 rcu_read_lock(); 2327 2328 /* 2329 * We process outgoing injected frames that have a local address 2330 * we handle as though they are non-injected frames. 2331 * This code here isn't entirely correct, the local MAC address 2332 * isn't always enough to find the interface to use; for proper 2333 * VLAN support we have an nl80211-based mechanism. 2334 * 2335 * This is necessary, for example, for old hostapd versions that 2336 * don't use nl80211-based management TX/RX. 2337 */ 2338 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2339 2340 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2341 if (!ieee80211_sdata_running(tmp_sdata)) 2342 continue; 2343 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2344 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2345 continue; 2346 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2347 sdata = tmp_sdata; 2348 break; 2349 } 2350 } 2351 2352 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2353 if (!chanctx_conf) { 2354 tmp_sdata = rcu_dereference(local->monitor_sdata); 2355 if (tmp_sdata) 2356 chanctx_conf = 2357 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2358 } 2359 2360 if (chanctx_conf) 2361 chandef = &chanctx_conf->def; 2362 else if (!local->use_chanctx) 2363 chandef = &local->_oper_chandef; 2364 else 2365 goto fail_rcu; 2366 2367 /* 2368 * Frame injection is not allowed if beaconing is not allowed 2369 * or if we need radar detection. Beaconing is usually not allowed when 2370 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2371 * Passive scan is also used in world regulatory domains where 2372 * your country is not known and as such it should be treated as 2373 * NO TX unless the channel is explicitly allowed in which case 2374 * your current regulatory domain would not have the passive scan 2375 * flag. 2376 * 2377 * Since AP mode uses monitor interfaces to inject/TX management 2378 * frames we can make AP mode the exception to this rule once it 2379 * supports radar detection as its implementation can deal with 2380 * radar detection by itself. We can do that later by adding a 2381 * monitor flag interfaces used for AP support. 2382 */ 2383 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2384 sdata->vif.type)) 2385 goto fail_rcu; 2386 2387 info->band = chandef->chan->band; 2388 2389 /* Initialize skb->priority according to frame type and TID class, 2390 * with respect to the sub interface that the frame will actually 2391 * be transmitted on. If the DONT_REORDER flag is set, the original 2392 * skb-priority is preserved to assure frames injected with this 2393 * flag are not reordered relative to each other. 2394 */ 2395 ieee80211_select_queue_80211(sdata, skb, hdr); 2396 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2397 2398 /* 2399 * Process the radiotap header. This will now take into account the 2400 * selected chandef above to accurately set injection rates and 2401 * retransmissions. 2402 */ 2403 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2404 goto fail_rcu; 2405 2406 /* remove the injection radiotap header */ 2407 skb_pull(skb, len_rthdr); 2408 2409 ieee80211_xmit(sdata, NULL, skb); 2410 rcu_read_unlock(); 2411 2412 return NETDEV_TX_OK; 2413 2414 fail_rcu: 2415 rcu_read_unlock(); 2416 fail: 2417 dev_kfree_skb(skb); 2418 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2419 } 2420 2421 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2422 { 2423 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2424 2425 return ethertype == ETH_P_TDLS && 2426 skb->len > 14 && 2427 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2428 } 2429 2430 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2431 struct sk_buff *skb, 2432 struct sta_info **sta_out) 2433 { 2434 struct sta_info *sta; 2435 2436 switch (sdata->vif.type) { 2437 case NL80211_IFTYPE_AP_VLAN: 2438 sta = rcu_dereference(sdata->u.vlan.sta); 2439 if (sta) { 2440 *sta_out = sta; 2441 return 0; 2442 } else if (sdata->wdev.use_4addr) { 2443 return -ENOLINK; 2444 } 2445 fallthrough; 2446 case NL80211_IFTYPE_AP: 2447 case NL80211_IFTYPE_OCB: 2448 case NL80211_IFTYPE_ADHOC: 2449 if (is_multicast_ether_addr(skb->data)) { 2450 *sta_out = ERR_PTR(-ENOENT); 2451 return 0; 2452 } 2453 sta = sta_info_get_bss(sdata, skb->data); 2454 break; 2455 #ifdef CONFIG_MAC80211_MESH 2456 case NL80211_IFTYPE_MESH_POINT: 2457 /* determined much later */ 2458 *sta_out = NULL; 2459 return 0; 2460 #endif 2461 case NL80211_IFTYPE_STATION: 2462 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2463 sta = sta_info_get(sdata, skb->data); 2464 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2465 if (test_sta_flag(sta, 2466 WLAN_STA_TDLS_PEER_AUTH)) { 2467 *sta_out = sta; 2468 return 0; 2469 } 2470 2471 /* 2472 * TDLS link during setup - throw out frames to 2473 * peer. Allow TDLS-setup frames to unauthorized 2474 * peers for the special case of a link teardown 2475 * after a TDLS sta is removed due to being 2476 * unreachable. 2477 */ 2478 if (!ieee80211_is_tdls_setup(skb)) 2479 return -EINVAL; 2480 } 2481 2482 } 2483 2484 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2485 if (!sta) 2486 return -ENOLINK; 2487 break; 2488 default: 2489 return -EINVAL; 2490 } 2491 2492 *sta_out = sta ?: ERR_PTR(-ENOENT); 2493 return 0; 2494 } 2495 2496 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2497 struct sk_buff *skb, 2498 u32 *info_flags, 2499 u64 *cookie) 2500 { 2501 struct sk_buff *ack_skb; 2502 u16 info_id = 0; 2503 2504 if (skb->sk) 2505 ack_skb = skb_clone_sk(skb); 2506 else 2507 ack_skb = skb_clone(skb, GFP_ATOMIC); 2508 2509 if (ack_skb) { 2510 unsigned long flags; 2511 int id; 2512 2513 spin_lock_irqsave(&local->ack_status_lock, flags); 2514 id = idr_alloc(&local->ack_status_frames, ack_skb, 2515 1, 0x2000, GFP_ATOMIC); 2516 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2517 2518 if (id >= 0) { 2519 info_id = id; 2520 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2521 if (cookie) { 2522 *cookie = ieee80211_mgmt_tx_cookie(local); 2523 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2524 } 2525 } else { 2526 kfree_skb(ack_skb); 2527 } 2528 } 2529 2530 return info_id; 2531 } 2532 2533 /** 2534 * ieee80211_build_hdr - build 802.11 header in the given frame 2535 * @sdata: virtual interface to build the header for 2536 * @skb: the skb to build the header in 2537 * @info_flags: skb flags to set 2538 * @sta: the station pointer 2539 * @ctrl_flags: info control flags to set 2540 * @cookie: cookie pointer to fill (if not %NULL) 2541 * 2542 * This function takes the skb with 802.3 header and reformats the header to 2543 * the appropriate IEEE 802.11 header based on which interface the packet is 2544 * being transmitted on. 2545 * 2546 * Note that this function also takes care of the TX status request and 2547 * potential unsharing of the SKB - this needs to be interleaved with the 2548 * header building. 2549 * 2550 * The function requires the read-side RCU lock held 2551 * 2552 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2553 */ 2554 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2555 struct sk_buff *skb, u32 info_flags, 2556 struct sta_info *sta, u32 ctrl_flags, 2557 u64 *cookie) 2558 { 2559 struct ieee80211_local *local = sdata->local; 2560 struct ieee80211_tx_info *info; 2561 int head_need; 2562 u16 ethertype, hdrlen, meshhdrlen = 0; 2563 __le16 fc; 2564 struct ieee80211_hdr hdr; 2565 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2566 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2567 const u8 *encaps_data; 2568 int encaps_len, skip_header_bytes; 2569 bool wme_sta = false, authorized = false; 2570 bool tdls_peer; 2571 bool multicast; 2572 u16 info_id = 0; 2573 struct ieee80211_chanctx_conf *chanctx_conf; 2574 struct ieee80211_sub_if_data *ap_sdata; 2575 enum nl80211_band band; 2576 int ret; 2577 2578 if (IS_ERR(sta)) 2579 sta = NULL; 2580 2581 #ifdef CONFIG_MAC80211_DEBUGFS 2582 if (local->force_tx_status) 2583 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2584 #endif 2585 2586 /* convert Ethernet header to proper 802.11 header (based on 2587 * operation mode) */ 2588 ethertype = (skb->data[12] << 8) | skb->data[13]; 2589 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2590 2591 switch (sdata->vif.type) { 2592 case NL80211_IFTYPE_AP_VLAN: 2593 if (sdata->wdev.use_4addr) { 2594 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2595 /* RA TA DA SA */ 2596 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2597 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2598 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2599 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2600 hdrlen = 30; 2601 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2602 wme_sta = sta->sta.wme; 2603 } 2604 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2605 u.ap); 2606 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2607 if (!chanctx_conf) { 2608 ret = -ENOTCONN; 2609 goto free; 2610 } 2611 band = chanctx_conf->def.chan->band; 2612 if (sdata->wdev.use_4addr) 2613 break; 2614 fallthrough; 2615 case NL80211_IFTYPE_AP: 2616 if (sdata->vif.type == NL80211_IFTYPE_AP) 2617 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2618 if (!chanctx_conf) { 2619 ret = -ENOTCONN; 2620 goto free; 2621 } 2622 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2623 /* DA BSSID SA */ 2624 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2625 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2626 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2627 hdrlen = 24; 2628 band = chanctx_conf->def.chan->band; 2629 break; 2630 #ifdef CONFIG_MAC80211_MESH 2631 case NL80211_IFTYPE_MESH_POINT: 2632 if (!is_multicast_ether_addr(skb->data)) { 2633 struct sta_info *next_hop; 2634 bool mpp_lookup = true; 2635 2636 mpath = mesh_path_lookup(sdata, skb->data); 2637 if (mpath) { 2638 mpp_lookup = false; 2639 next_hop = rcu_dereference(mpath->next_hop); 2640 if (!next_hop || 2641 !(mpath->flags & (MESH_PATH_ACTIVE | 2642 MESH_PATH_RESOLVING))) 2643 mpp_lookup = true; 2644 } 2645 2646 if (mpp_lookup) { 2647 mppath = mpp_path_lookup(sdata, skb->data); 2648 if (mppath) 2649 mppath->exp_time = jiffies; 2650 } 2651 2652 if (mppath && mpath) 2653 mesh_path_del(sdata, mpath->dst); 2654 } 2655 2656 /* 2657 * Use address extension if it is a packet from 2658 * another interface or if we know the destination 2659 * is being proxied by a portal (i.e. portal address 2660 * differs from proxied address) 2661 */ 2662 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2663 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2664 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2665 skb->data, skb->data + ETH_ALEN); 2666 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2667 NULL, NULL); 2668 } else { 2669 /* DS -> MBSS (802.11-2012 13.11.3.3). 2670 * For unicast with unknown forwarding information, 2671 * destination might be in the MBSS or if that fails 2672 * forwarded to another mesh gate. In either case 2673 * resolution will be handled in ieee80211_xmit(), so 2674 * leave the original DA. This also works for mcast */ 2675 const u8 *mesh_da = skb->data; 2676 2677 if (mppath) 2678 mesh_da = mppath->mpp; 2679 else if (mpath) 2680 mesh_da = mpath->dst; 2681 2682 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2683 mesh_da, sdata->vif.addr); 2684 if (is_multicast_ether_addr(mesh_da)) 2685 /* DA TA mSA AE:SA */ 2686 meshhdrlen = ieee80211_new_mesh_header( 2687 sdata, &mesh_hdr, 2688 skb->data + ETH_ALEN, NULL); 2689 else 2690 /* RA TA mDA mSA AE:DA SA */ 2691 meshhdrlen = ieee80211_new_mesh_header( 2692 sdata, &mesh_hdr, skb->data, 2693 skb->data + ETH_ALEN); 2694 2695 } 2696 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2697 if (!chanctx_conf) { 2698 ret = -ENOTCONN; 2699 goto free; 2700 } 2701 band = chanctx_conf->def.chan->band; 2702 2703 /* For injected frames, fill RA right away as nexthop lookup 2704 * will be skipped. 2705 */ 2706 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2707 is_zero_ether_addr(hdr.addr1)) 2708 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2709 break; 2710 #endif 2711 case NL80211_IFTYPE_STATION: 2712 /* we already did checks when looking up the RA STA */ 2713 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2714 2715 if (tdls_peer) { 2716 /* DA SA BSSID */ 2717 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2718 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2719 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2720 hdrlen = 24; 2721 } else if (sdata->u.mgd.use_4addr && 2722 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2723 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2724 IEEE80211_FCTL_TODS); 2725 /* RA TA DA SA */ 2726 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2727 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2728 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2729 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2730 hdrlen = 30; 2731 } else { 2732 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2733 /* BSSID SA DA */ 2734 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2735 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2736 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2737 hdrlen = 24; 2738 } 2739 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2740 if (!chanctx_conf) { 2741 ret = -ENOTCONN; 2742 goto free; 2743 } 2744 band = chanctx_conf->def.chan->band; 2745 break; 2746 case NL80211_IFTYPE_OCB: 2747 /* DA SA BSSID */ 2748 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2749 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2750 eth_broadcast_addr(hdr.addr3); 2751 hdrlen = 24; 2752 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2753 if (!chanctx_conf) { 2754 ret = -ENOTCONN; 2755 goto free; 2756 } 2757 band = chanctx_conf->def.chan->band; 2758 break; 2759 case NL80211_IFTYPE_ADHOC: 2760 /* DA SA BSSID */ 2761 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2762 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2763 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2764 hdrlen = 24; 2765 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2766 if (!chanctx_conf) { 2767 ret = -ENOTCONN; 2768 goto free; 2769 } 2770 band = chanctx_conf->def.chan->band; 2771 break; 2772 default: 2773 ret = -EINVAL; 2774 goto free; 2775 } 2776 2777 multicast = is_multicast_ether_addr(hdr.addr1); 2778 2779 /* sta is always NULL for mesh */ 2780 if (sta) { 2781 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2782 wme_sta = sta->sta.wme; 2783 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2784 /* For mesh, the use of the QoS header is mandatory */ 2785 wme_sta = true; 2786 } 2787 2788 /* receiver does QoS (which also means we do) use it */ 2789 if (wme_sta) { 2790 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2791 hdrlen += 2; 2792 } 2793 2794 /* 2795 * Drop unicast frames to unauthorised stations unless they are 2796 * EAPOL frames from the local station. 2797 */ 2798 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2799 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2800 !multicast && !authorized && 2801 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2802 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2803 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2804 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2805 sdata->name, hdr.addr1); 2806 #endif 2807 2808 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2809 2810 ret = -EPERM; 2811 goto free; 2812 } 2813 2814 if (unlikely(!multicast && ((skb->sk && 2815 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2816 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2817 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2818 cookie); 2819 2820 /* 2821 * If the skb is shared we need to obtain our own copy. 2822 */ 2823 if (skb_shared(skb)) { 2824 struct sk_buff *tmp_skb = skb; 2825 2826 /* can't happen -- skb is a clone if info_id != 0 */ 2827 WARN_ON(info_id); 2828 2829 skb = skb_clone(skb, GFP_ATOMIC); 2830 kfree_skb(tmp_skb); 2831 2832 if (!skb) { 2833 ret = -ENOMEM; 2834 goto free; 2835 } 2836 } 2837 2838 hdr.frame_control = fc; 2839 hdr.duration_id = 0; 2840 hdr.seq_ctrl = 0; 2841 2842 skip_header_bytes = ETH_HLEN; 2843 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2844 encaps_data = bridge_tunnel_header; 2845 encaps_len = sizeof(bridge_tunnel_header); 2846 skip_header_bytes -= 2; 2847 } else if (ethertype >= ETH_P_802_3_MIN) { 2848 encaps_data = rfc1042_header; 2849 encaps_len = sizeof(rfc1042_header); 2850 skip_header_bytes -= 2; 2851 } else { 2852 encaps_data = NULL; 2853 encaps_len = 0; 2854 } 2855 2856 skb_pull(skb, skip_header_bytes); 2857 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2858 2859 /* 2860 * So we need to modify the skb header and hence need a copy of 2861 * that. The head_need variable above doesn't, so far, include 2862 * the needed header space that we don't need right away. If we 2863 * can, then we don't reallocate right now but only after the 2864 * frame arrives at the master device (if it does...) 2865 * 2866 * If we cannot, however, then we will reallocate to include all 2867 * the ever needed space. Also, if we need to reallocate it anyway, 2868 * make it big enough for everything we may ever need. 2869 */ 2870 2871 if (head_need > 0 || skb_cloned(skb)) { 2872 head_need += sdata->encrypt_headroom; 2873 head_need += local->tx_headroom; 2874 head_need = max_t(int, 0, head_need); 2875 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2876 ieee80211_free_txskb(&local->hw, skb); 2877 skb = NULL; 2878 return ERR_PTR(-ENOMEM); 2879 } 2880 } 2881 2882 if (encaps_data) 2883 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2884 2885 #ifdef CONFIG_MAC80211_MESH 2886 if (meshhdrlen > 0) 2887 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2888 #endif 2889 2890 if (ieee80211_is_data_qos(fc)) { 2891 __le16 *qos_control; 2892 2893 qos_control = skb_push(skb, 2); 2894 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2895 /* 2896 * Maybe we could actually set some fields here, for now just 2897 * initialise to zero to indicate no special operation. 2898 */ 2899 *qos_control = 0; 2900 } else 2901 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2902 2903 skb_reset_mac_header(skb); 2904 2905 info = IEEE80211_SKB_CB(skb); 2906 memset(info, 0, sizeof(*info)); 2907 2908 info->flags = info_flags; 2909 info->ack_frame_id = info_id; 2910 info->band = band; 2911 info->control.flags = ctrl_flags; 2912 2913 return skb; 2914 free: 2915 kfree_skb(skb); 2916 return ERR_PTR(ret); 2917 } 2918 2919 /* 2920 * fast-xmit overview 2921 * 2922 * The core idea of this fast-xmit is to remove per-packet checks by checking 2923 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2924 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2925 * much less work can be done per packet. For example, fragmentation must be 2926 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2927 * in the code here. 2928 * 2929 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2930 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2931 * 2932 * The most difficult part of this is that when any of these assumptions 2933 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2934 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2935 * since the per-packet code no longer checks the conditions. This is reflected 2936 * by the calls to these functions throughout the rest of the code, and must be 2937 * maintained if any of the TX path checks change. 2938 */ 2939 2940 void ieee80211_check_fast_xmit(struct sta_info *sta) 2941 { 2942 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2943 struct ieee80211_local *local = sta->local; 2944 struct ieee80211_sub_if_data *sdata = sta->sdata; 2945 struct ieee80211_hdr *hdr = (void *)build.hdr; 2946 struct ieee80211_chanctx_conf *chanctx_conf; 2947 __le16 fc; 2948 2949 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2950 return; 2951 2952 /* Locking here protects both the pointer itself, and against concurrent 2953 * invocations winning data access races to, e.g., the key pointer that 2954 * is used. 2955 * Without it, the invocation of this function right after the key 2956 * pointer changes wouldn't be sufficient, as another CPU could access 2957 * the pointer, then stall, and then do the cache update after the CPU 2958 * that invalidated the key. 2959 * With the locking, such scenarios cannot happen as the check for the 2960 * key and the fast-tx assignment are done atomically, so the CPU that 2961 * modifies the key will either wait or other one will see the key 2962 * cleared/changed already. 2963 */ 2964 spin_lock_bh(&sta->lock); 2965 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2966 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2967 sdata->vif.type == NL80211_IFTYPE_STATION) 2968 goto out; 2969 2970 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2971 goto out; 2972 2973 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2974 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2975 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2976 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2977 goto out; 2978 2979 if (sdata->noack_map) 2980 goto out; 2981 2982 /* fast-xmit doesn't handle fragmentation at all */ 2983 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2984 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2985 goto out; 2986 2987 rcu_read_lock(); 2988 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2989 if (!chanctx_conf) { 2990 rcu_read_unlock(); 2991 goto out; 2992 } 2993 build.band = chanctx_conf->def.chan->band; 2994 rcu_read_unlock(); 2995 2996 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2997 2998 switch (sdata->vif.type) { 2999 case NL80211_IFTYPE_ADHOC: 3000 /* DA SA BSSID */ 3001 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3002 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3003 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3004 build.hdr_len = 24; 3005 break; 3006 case NL80211_IFTYPE_STATION: 3007 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3008 /* DA SA BSSID */ 3009 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3010 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3011 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 3012 build.hdr_len = 24; 3013 break; 3014 } 3015 3016 if (sdata->u.mgd.use_4addr) { 3017 /* non-regular ethertype cannot use the fastpath */ 3018 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3019 IEEE80211_FCTL_TODS); 3020 /* RA TA DA SA */ 3021 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 3022 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3023 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3024 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3025 build.hdr_len = 30; 3026 break; 3027 } 3028 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3029 /* BSSID SA DA */ 3030 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 3031 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3032 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3033 build.hdr_len = 24; 3034 break; 3035 case NL80211_IFTYPE_AP_VLAN: 3036 if (sdata->wdev.use_4addr) { 3037 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3038 IEEE80211_FCTL_TODS); 3039 /* RA TA DA SA */ 3040 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3041 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3042 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3043 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3044 build.hdr_len = 30; 3045 break; 3046 } 3047 fallthrough; 3048 case NL80211_IFTYPE_AP: 3049 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3050 /* DA BSSID SA */ 3051 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3052 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3053 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3054 build.hdr_len = 24; 3055 break; 3056 default: 3057 /* not handled on fast-xmit */ 3058 goto out; 3059 } 3060 3061 if (sta->sta.wme) { 3062 build.hdr_len += 2; 3063 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3064 } 3065 3066 /* We store the key here so there's no point in using rcu_dereference() 3067 * but that's fine because the code that changes the pointers will call 3068 * this function after doing so. For a single CPU that would be enough, 3069 * for multiple see the comment above. 3070 */ 3071 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3072 if (!build.key) 3073 build.key = rcu_access_pointer(sdata->default_unicast_key); 3074 if (build.key) { 3075 bool gen_iv, iv_spc, mmic; 3076 3077 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3078 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3079 mmic = build.key->conf.flags & 3080 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3081 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3082 3083 /* don't handle software crypto */ 3084 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3085 goto out; 3086 3087 /* Key is being removed */ 3088 if (build.key->flags & KEY_FLAG_TAINTED) 3089 goto out; 3090 3091 switch (build.key->conf.cipher) { 3092 case WLAN_CIPHER_SUITE_CCMP: 3093 case WLAN_CIPHER_SUITE_CCMP_256: 3094 if (gen_iv) 3095 build.pn_offs = build.hdr_len; 3096 if (gen_iv || iv_spc) 3097 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3098 break; 3099 case WLAN_CIPHER_SUITE_GCMP: 3100 case WLAN_CIPHER_SUITE_GCMP_256: 3101 if (gen_iv) 3102 build.pn_offs = build.hdr_len; 3103 if (gen_iv || iv_spc) 3104 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3105 break; 3106 case WLAN_CIPHER_SUITE_TKIP: 3107 /* cannot handle MMIC or IV generation in xmit-fast */ 3108 if (mmic || gen_iv) 3109 goto out; 3110 if (iv_spc) 3111 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3112 break; 3113 case WLAN_CIPHER_SUITE_WEP40: 3114 case WLAN_CIPHER_SUITE_WEP104: 3115 /* cannot handle IV generation in fast-xmit */ 3116 if (gen_iv) 3117 goto out; 3118 if (iv_spc) 3119 build.hdr_len += IEEE80211_WEP_IV_LEN; 3120 break; 3121 case WLAN_CIPHER_SUITE_AES_CMAC: 3122 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3123 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3124 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3125 WARN(1, 3126 "management cipher suite 0x%x enabled for data\n", 3127 build.key->conf.cipher); 3128 goto out; 3129 default: 3130 /* we don't know how to generate IVs for this at all */ 3131 if (WARN_ON(gen_iv)) 3132 goto out; 3133 /* pure hardware keys are OK, of course */ 3134 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3135 break; 3136 /* cipher scheme might require space allocation */ 3137 if (iv_spc && 3138 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3139 goto out; 3140 if (iv_spc) 3141 build.hdr_len += build.key->conf.iv_len; 3142 } 3143 3144 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3145 } 3146 3147 hdr->frame_control = fc; 3148 3149 memcpy(build.hdr + build.hdr_len, 3150 rfc1042_header, sizeof(rfc1042_header)); 3151 build.hdr_len += sizeof(rfc1042_header); 3152 3153 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3154 /* if the kmemdup fails, continue w/o fast_tx */ 3155 if (!fast_tx) 3156 goto out; 3157 3158 out: 3159 /* we might have raced against another call to this function */ 3160 old = rcu_dereference_protected(sta->fast_tx, 3161 lockdep_is_held(&sta->lock)); 3162 rcu_assign_pointer(sta->fast_tx, fast_tx); 3163 if (old) 3164 kfree_rcu(old, rcu_head); 3165 spin_unlock_bh(&sta->lock); 3166 } 3167 3168 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3169 { 3170 struct sta_info *sta; 3171 3172 rcu_read_lock(); 3173 list_for_each_entry_rcu(sta, &local->sta_list, list) 3174 ieee80211_check_fast_xmit(sta); 3175 rcu_read_unlock(); 3176 } 3177 3178 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3179 { 3180 struct ieee80211_local *local = sdata->local; 3181 struct sta_info *sta; 3182 3183 rcu_read_lock(); 3184 3185 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3186 if (sdata != sta->sdata && 3187 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3188 continue; 3189 ieee80211_check_fast_xmit(sta); 3190 } 3191 3192 rcu_read_unlock(); 3193 } 3194 3195 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3196 { 3197 struct ieee80211_fast_tx *fast_tx; 3198 3199 spin_lock_bh(&sta->lock); 3200 fast_tx = rcu_dereference_protected(sta->fast_tx, 3201 lockdep_is_held(&sta->lock)); 3202 RCU_INIT_POINTER(sta->fast_tx, NULL); 3203 spin_unlock_bh(&sta->lock); 3204 3205 if (fast_tx) 3206 kfree_rcu(fast_tx, rcu_head); 3207 } 3208 3209 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3210 struct sk_buff *skb, int headroom) 3211 { 3212 if (skb_headroom(skb) < headroom) { 3213 I802_DEBUG_INC(local->tx_expand_skb_head); 3214 3215 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3216 wiphy_debug(local->hw.wiphy, 3217 "failed to reallocate TX buffer\n"); 3218 return false; 3219 } 3220 } 3221 3222 return true; 3223 } 3224 3225 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3226 struct ieee80211_fast_tx *fast_tx, 3227 struct sk_buff *skb) 3228 { 3229 struct ieee80211_local *local = sdata->local; 3230 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3231 struct ieee80211_hdr *hdr; 3232 struct ethhdr *amsdu_hdr; 3233 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3234 int subframe_len = skb->len - hdr_len; 3235 void *data; 3236 u8 *qc, *h_80211_src, *h_80211_dst; 3237 const u8 *bssid; 3238 3239 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3240 return false; 3241 3242 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3243 return true; 3244 3245 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3246 return false; 3247 3248 data = skb_push(skb, sizeof(*amsdu_hdr)); 3249 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3250 hdr = data; 3251 amsdu_hdr = data + hdr_len; 3252 /* h_80211_src/dst is addr* field within hdr */ 3253 h_80211_src = data + fast_tx->sa_offs; 3254 h_80211_dst = data + fast_tx->da_offs; 3255 3256 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3257 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3258 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3259 3260 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3261 * fields needs to be changed to BSSID for A-MSDU frames depending 3262 * on FromDS/ToDS values. 3263 */ 3264 switch (sdata->vif.type) { 3265 case NL80211_IFTYPE_STATION: 3266 bssid = sdata->u.mgd.bssid; 3267 break; 3268 case NL80211_IFTYPE_AP: 3269 case NL80211_IFTYPE_AP_VLAN: 3270 bssid = sdata->vif.addr; 3271 break; 3272 default: 3273 bssid = NULL; 3274 } 3275 3276 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3277 ether_addr_copy(h_80211_src, bssid); 3278 3279 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3280 ether_addr_copy(h_80211_dst, bssid); 3281 3282 qc = ieee80211_get_qos_ctl(hdr); 3283 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3284 3285 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3286 3287 return true; 3288 } 3289 3290 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3291 struct sta_info *sta, 3292 struct ieee80211_fast_tx *fast_tx, 3293 struct sk_buff *skb) 3294 { 3295 struct ieee80211_local *local = sdata->local; 3296 struct fq *fq = &local->fq; 3297 struct fq_tin *tin; 3298 struct fq_flow *flow; 3299 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3300 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3301 struct txq_info *txqi; 3302 struct sk_buff **frag_tail, *head; 3303 int subframe_len = skb->len - ETH_ALEN; 3304 u8 max_subframes = sta->sta.max_amsdu_subframes; 3305 int max_frags = local->hw.max_tx_fragments; 3306 int max_amsdu_len = sta->sta.max_amsdu_len; 3307 int orig_truesize; 3308 u32 flow_idx; 3309 __be16 len; 3310 void *data; 3311 bool ret = false; 3312 unsigned int orig_len; 3313 int n = 2, nfrags, pad = 0; 3314 u16 hdrlen; 3315 3316 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3317 return false; 3318 3319 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3320 return false; 3321 3322 if (skb_is_gso(skb)) 3323 return false; 3324 3325 if (!txq) 3326 return false; 3327 3328 txqi = to_txq_info(txq); 3329 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3330 return false; 3331 3332 if (sta->sta.max_rc_amsdu_len) 3333 max_amsdu_len = min_t(int, max_amsdu_len, 3334 sta->sta.max_rc_amsdu_len); 3335 3336 if (sta->sta.max_tid_amsdu_len[tid]) 3337 max_amsdu_len = min_t(int, max_amsdu_len, 3338 sta->sta.max_tid_amsdu_len[tid]); 3339 3340 flow_idx = fq_flow_idx(fq, skb); 3341 3342 spin_lock_bh(&fq->lock); 3343 3344 /* TODO: Ideally aggregation should be done on dequeue to remain 3345 * responsive to environment changes. 3346 */ 3347 3348 tin = &txqi->tin; 3349 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3350 head = skb_peek_tail(&flow->queue); 3351 if (!head || skb_is_gso(head)) 3352 goto out; 3353 3354 orig_truesize = head->truesize; 3355 orig_len = head->len; 3356 3357 if (skb->len + head->len > max_amsdu_len) 3358 goto out; 3359 3360 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3361 nfrags += 1 + skb_shinfo(head)->nr_frags; 3362 frag_tail = &skb_shinfo(head)->frag_list; 3363 while (*frag_tail) { 3364 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3365 frag_tail = &(*frag_tail)->next; 3366 n++; 3367 } 3368 3369 if (max_subframes && n > max_subframes) 3370 goto out; 3371 3372 if (max_frags && nfrags > max_frags) 3373 goto out; 3374 3375 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3376 goto out; 3377 3378 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3379 goto out; 3380 3381 /* 3382 * Pad out the previous subframe to a multiple of 4 by adding the 3383 * padding to the next one, that's being added. Note that head->len 3384 * is the length of the full A-MSDU, but that works since each time 3385 * we add a new subframe we pad out the previous one to a multiple 3386 * of 4 and thus it no longer matters in the next round. 3387 */ 3388 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3389 if ((head->len - hdrlen) & 3) 3390 pad = 4 - ((head->len - hdrlen) & 3); 3391 3392 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3393 2 + pad)) 3394 goto out_recalc; 3395 3396 ret = true; 3397 data = skb_push(skb, ETH_ALEN + 2); 3398 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3399 3400 data += 2 * ETH_ALEN; 3401 len = cpu_to_be16(subframe_len); 3402 memcpy(data, &len, 2); 3403 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3404 3405 memset(skb_push(skb, pad), 0, pad); 3406 3407 head->len += skb->len; 3408 head->data_len += skb->len; 3409 *frag_tail = skb; 3410 3411 out_recalc: 3412 fq->memory_usage += head->truesize - orig_truesize; 3413 if (head->len != orig_len) { 3414 flow->backlog += head->len - orig_len; 3415 tin->backlog_bytes += head->len - orig_len; 3416 } 3417 out: 3418 spin_unlock_bh(&fq->lock); 3419 3420 return ret; 3421 } 3422 3423 /* 3424 * Can be called while the sta lock is held. Anything that can cause packets to 3425 * be generated will cause deadlock! 3426 */ 3427 static ieee80211_tx_result 3428 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3429 struct sta_info *sta, u8 pn_offs, 3430 struct ieee80211_key *key, 3431 struct ieee80211_tx_data *tx) 3432 { 3433 struct sk_buff *skb = tx->skb; 3434 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3435 struct ieee80211_hdr *hdr = (void *)skb->data; 3436 u8 tid = IEEE80211_NUM_TIDS; 3437 3438 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3439 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3440 return TX_DROP; 3441 3442 if (key) 3443 info->control.hw_key = &key->conf; 3444 3445 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3446 3447 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3448 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3449 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3450 } else { 3451 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3452 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3453 sdata->sequence_number += 0x10; 3454 } 3455 3456 if (skb_shinfo(skb)->gso_size) 3457 sta->tx_stats.msdu[tid] += 3458 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3459 else 3460 sta->tx_stats.msdu[tid]++; 3461 3462 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3463 3464 /* statistics normally done by ieee80211_tx_h_stats (but that 3465 * has to consider fragmentation, so is more complex) 3466 */ 3467 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3468 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3469 3470 if (pn_offs) { 3471 u64 pn; 3472 u8 *crypto_hdr = skb->data + pn_offs; 3473 3474 switch (key->conf.cipher) { 3475 case WLAN_CIPHER_SUITE_CCMP: 3476 case WLAN_CIPHER_SUITE_CCMP_256: 3477 case WLAN_CIPHER_SUITE_GCMP: 3478 case WLAN_CIPHER_SUITE_GCMP_256: 3479 pn = atomic64_inc_return(&key->conf.tx_pn); 3480 crypto_hdr[0] = pn; 3481 crypto_hdr[1] = pn >> 8; 3482 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3483 crypto_hdr[4] = pn >> 16; 3484 crypto_hdr[5] = pn >> 24; 3485 crypto_hdr[6] = pn >> 32; 3486 crypto_hdr[7] = pn >> 40; 3487 break; 3488 } 3489 } 3490 3491 return TX_CONTINUE; 3492 } 3493 3494 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3495 struct sta_info *sta, 3496 struct ieee80211_fast_tx *fast_tx, 3497 struct sk_buff *skb) 3498 { 3499 struct ieee80211_local *local = sdata->local; 3500 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3501 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3502 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3503 struct ethhdr eth; 3504 struct ieee80211_tx_info *info; 3505 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3506 struct ieee80211_tx_data tx; 3507 ieee80211_tx_result r; 3508 struct tid_ampdu_tx *tid_tx = NULL; 3509 u8 tid = IEEE80211_NUM_TIDS; 3510 3511 /* control port protocol needs a lot of special handling */ 3512 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3513 return false; 3514 3515 /* only RFC 1042 SNAP */ 3516 if (ethertype < ETH_P_802_3_MIN) 3517 return false; 3518 3519 /* don't handle TX status request here either */ 3520 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3521 return false; 3522 3523 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3524 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3525 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3526 if (tid_tx) { 3527 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3528 return false; 3529 if (tid_tx->timeout) 3530 tid_tx->last_tx = jiffies; 3531 } 3532 } 3533 3534 /* after this point (skb is modified) we cannot return false */ 3535 3536 if (skb_shared(skb)) { 3537 struct sk_buff *tmp_skb = skb; 3538 3539 skb = skb_clone(skb, GFP_ATOMIC); 3540 kfree_skb(tmp_skb); 3541 3542 if (!skb) 3543 return true; 3544 } 3545 3546 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3547 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3548 return true; 3549 3550 /* will not be crypto-handled beyond what we do here, so use false 3551 * as the may-encrypt argument for the resize to not account for 3552 * more room than we already have in 'extra_head' 3553 */ 3554 if (unlikely(ieee80211_skb_resize(sdata, skb, 3555 max_t(int, extra_head + hw_headroom - 3556 skb_headroom(skb), 0), 3557 ENCRYPT_NO))) { 3558 kfree_skb(skb); 3559 return true; 3560 } 3561 3562 memcpy(ð, skb->data, ETH_HLEN - 2); 3563 hdr = skb_push(skb, extra_head); 3564 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3565 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3566 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3567 3568 info = IEEE80211_SKB_CB(skb); 3569 memset(info, 0, sizeof(*info)); 3570 info->band = fast_tx->band; 3571 info->control.vif = &sdata->vif; 3572 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3573 IEEE80211_TX_CTL_DONTFRAG | 3574 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3575 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3576 3577 #ifdef CONFIG_MAC80211_DEBUGFS 3578 if (local->force_tx_status) 3579 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3580 #endif 3581 3582 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3583 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3584 *ieee80211_get_qos_ctl(hdr) = tid; 3585 } 3586 3587 __skb_queue_head_init(&tx.skbs); 3588 3589 tx.flags = IEEE80211_TX_UNICAST; 3590 tx.local = local; 3591 tx.sdata = sdata; 3592 tx.sta = sta; 3593 tx.key = fast_tx->key; 3594 3595 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3596 return true; 3597 3598 tx.skb = skb; 3599 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3600 fast_tx->key, &tx); 3601 tx.skb = NULL; 3602 if (r == TX_DROP) { 3603 kfree_skb(skb); 3604 return true; 3605 } 3606 3607 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3608 sdata = container_of(sdata->bss, 3609 struct ieee80211_sub_if_data, u.ap); 3610 3611 __skb_queue_tail(&tx.skbs, skb); 3612 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3613 return true; 3614 } 3615 3616 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3617 struct ieee80211_txq *txq) 3618 { 3619 struct ieee80211_local *local = hw_to_local(hw); 3620 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3621 struct ieee80211_hdr *hdr; 3622 struct sk_buff *skb = NULL; 3623 struct fq *fq = &local->fq; 3624 struct fq_tin *tin = &txqi->tin; 3625 struct ieee80211_tx_info *info; 3626 struct ieee80211_tx_data tx; 3627 ieee80211_tx_result r; 3628 struct ieee80211_vif *vif = txq->vif; 3629 3630 WARN_ON_ONCE(softirq_count() == 0); 3631 3632 if (!ieee80211_txq_airtime_check(hw, txq)) 3633 return NULL; 3634 3635 begin: 3636 spin_lock_bh(&fq->lock); 3637 3638 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3639 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3640 goto out; 3641 3642 if (vif->txqs_stopped[txq->ac]) { 3643 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3644 goto out; 3645 } 3646 3647 /* Make sure fragments stay together. */ 3648 skb = __skb_dequeue(&txqi->frags); 3649 if (unlikely(skb)) { 3650 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3651 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3652 goto out; 3653 IEEE80211_SKB_CB(skb)->control.flags &= 3654 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3655 } else { 3656 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3657 } 3658 3659 if (!skb) 3660 goto out; 3661 3662 spin_unlock_bh(&fq->lock); 3663 3664 hdr = (struct ieee80211_hdr *)skb->data; 3665 info = IEEE80211_SKB_CB(skb); 3666 3667 memset(&tx, 0, sizeof(tx)); 3668 __skb_queue_head_init(&tx.skbs); 3669 tx.local = local; 3670 tx.skb = skb; 3671 tx.sdata = vif_to_sdata(info->control.vif); 3672 3673 if (txq->sta) { 3674 tx.sta = container_of(txq->sta, struct sta_info, sta); 3675 /* 3676 * Drop unicast frames to unauthorised stations unless they are 3677 * injected frames or EAPOL frames from the local station. 3678 */ 3679 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3680 ieee80211_is_data(hdr->frame_control) && 3681 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3682 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3683 !is_multicast_ether_addr(hdr->addr1) && 3684 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3685 (!(info->control.flags & 3686 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3687 !ether_addr_equal(tx.sdata->vif.addr, 3688 hdr->addr2)))) { 3689 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3690 ieee80211_free_txskb(&local->hw, skb); 3691 goto begin; 3692 } 3693 } 3694 3695 /* 3696 * The key can be removed while the packet was queued, so need to call 3697 * this here to get the current key. 3698 */ 3699 r = ieee80211_tx_h_select_key(&tx); 3700 if (r != TX_CONTINUE) { 3701 ieee80211_free_txskb(&local->hw, skb); 3702 goto begin; 3703 } 3704 3705 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3706 info->flags |= IEEE80211_TX_CTL_AMPDU; 3707 else 3708 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3709 3710 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3711 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3712 r = ieee80211_tx_h_rate_ctrl(&tx); 3713 if (r != TX_CONTINUE) { 3714 ieee80211_free_txskb(&local->hw, skb); 3715 goto begin; 3716 } 3717 } 3718 goto encap_out; 3719 } 3720 3721 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3722 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3723 sta); 3724 u8 pn_offs = 0; 3725 3726 if (tx.key && 3727 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3728 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3729 3730 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3731 tx.key, &tx); 3732 if (r != TX_CONTINUE) { 3733 ieee80211_free_txskb(&local->hw, skb); 3734 goto begin; 3735 } 3736 } else { 3737 if (invoke_tx_handlers_late(&tx)) 3738 goto begin; 3739 3740 skb = __skb_dequeue(&tx.skbs); 3741 3742 if (!skb_queue_empty(&tx.skbs)) { 3743 spin_lock_bh(&fq->lock); 3744 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3745 spin_unlock_bh(&fq->lock); 3746 } 3747 } 3748 3749 if (skb_has_frag_list(skb) && 3750 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3751 if (skb_linearize(skb)) { 3752 ieee80211_free_txskb(&local->hw, skb); 3753 goto begin; 3754 } 3755 } 3756 3757 switch (tx.sdata->vif.type) { 3758 case NL80211_IFTYPE_MONITOR: 3759 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3760 vif = &tx.sdata->vif; 3761 break; 3762 } 3763 tx.sdata = rcu_dereference(local->monitor_sdata); 3764 if (tx.sdata) { 3765 vif = &tx.sdata->vif; 3766 info->hw_queue = 3767 vif->hw_queue[skb_get_queue_mapping(skb)]; 3768 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3769 ieee80211_free_txskb(&local->hw, skb); 3770 goto begin; 3771 } else { 3772 vif = NULL; 3773 } 3774 break; 3775 case NL80211_IFTYPE_AP_VLAN: 3776 tx.sdata = container_of(tx.sdata->bss, 3777 struct ieee80211_sub_if_data, u.ap); 3778 fallthrough; 3779 default: 3780 vif = &tx.sdata->vif; 3781 break; 3782 } 3783 3784 encap_out: 3785 IEEE80211_SKB_CB(skb)->control.vif = vif; 3786 3787 if (vif && 3788 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3789 bool ampdu = txq->ac != IEEE80211_AC_VO; 3790 u32 airtime; 3791 3792 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3793 skb->len, ampdu); 3794 if (airtime) { 3795 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3796 ieee80211_sta_update_pending_airtime(local, tx.sta, 3797 txq->ac, 3798 airtime, 3799 false); 3800 } 3801 } 3802 3803 return skb; 3804 3805 out: 3806 spin_unlock_bh(&fq->lock); 3807 3808 return skb; 3809 } 3810 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3811 3812 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3813 { 3814 struct ieee80211_local *local = hw_to_local(hw); 3815 struct airtime_sched_info *air_sched; 3816 u64 now = ktime_get_boottime_ns(); 3817 struct ieee80211_txq *ret = NULL; 3818 struct airtime_info *air_info; 3819 struct txq_info *txqi = NULL; 3820 struct rb_node *node; 3821 bool first = false; 3822 3823 air_sched = &local->airtime[ac]; 3824 spin_lock_bh(&air_sched->lock); 3825 3826 node = air_sched->schedule_pos; 3827 3828 begin: 3829 if (!node) { 3830 node = rb_first_cached(&air_sched->active_txqs); 3831 first = true; 3832 } else { 3833 node = rb_next(node); 3834 } 3835 3836 if (!node) 3837 goto out; 3838 3839 txqi = container_of(node, struct txq_info, schedule_order); 3840 air_info = to_airtime_info(&txqi->txq); 3841 3842 if (air_info->v_t > air_sched->v_t && 3843 (!first || !airtime_catchup_v_t(air_sched, air_info->v_t, now))) 3844 goto out; 3845 3846 if (!ieee80211_txq_airtime_check(hw, &txqi->txq)) { 3847 first = false; 3848 goto begin; 3849 } 3850 3851 air_sched->schedule_pos = node; 3852 air_sched->last_schedule_activity = now; 3853 ret = &txqi->txq; 3854 out: 3855 spin_unlock_bh(&air_sched->lock); 3856 return ret; 3857 } 3858 EXPORT_SYMBOL(ieee80211_next_txq); 3859 3860 static void __ieee80211_insert_txq(struct rb_root_cached *root, 3861 struct txq_info *txqi) 3862 { 3863 struct rb_node **new = &root->rb_root.rb_node; 3864 struct airtime_info *old_air, *new_air; 3865 struct rb_node *parent = NULL; 3866 struct txq_info *__txqi; 3867 bool leftmost = true; 3868 3869 while (*new) { 3870 parent = *new; 3871 __txqi = rb_entry(parent, struct txq_info, schedule_order); 3872 old_air = to_airtime_info(&__txqi->txq); 3873 new_air = to_airtime_info(&txqi->txq); 3874 3875 if (new_air->v_t <= old_air->v_t) { 3876 new = &parent->rb_left; 3877 } else { 3878 new = &parent->rb_right; 3879 leftmost = false; 3880 } 3881 } 3882 3883 rb_link_node(&txqi->schedule_order, parent, new); 3884 rb_insert_color_cached(&txqi->schedule_order, root, leftmost); 3885 } 3886 3887 void ieee80211_resort_txq(struct ieee80211_hw *hw, 3888 struct ieee80211_txq *txq) 3889 { 3890 struct airtime_info *air_info = to_airtime_info(txq); 3891 struct ieee80211_local *local = hw_to_local(hw); 3892 struct txq_info *txqi = to_txq_info(txq); 3893 struct airtime_sched_info *air_sched; 3894 3895 air_sched = &local->airtime[txq->ac]; 3896 3897 lockdep_assert_held(&air_sched->lock); 3898 3899 if (!RB_EMPTY_NODE(&txqi->schedule_order)) { 3900 struct airtime_info *a_prev = NULL, *a_next = NULL; 3901 struct txq_info *t_prev, *t_next; 3902 struct rb_node *n_prev, *n_next; 3903 3904 /* Erasing a node can cause an expensive rebalancing operation, 3905 * so we check the previous and next nodes first and only remove 3906 * and re-insert if the current node is not already in the 3907 * correct position. 3908 */ 3909 if ((n_prev = rb_prev(&txqi->schedule_order)) != NULL) { 3910 t_prev = container_of(n_prev, struct txq_info, 3911 schedule_order); 3912 a_prev = to_airtime_info(&t_prev->txq); 3913 } 3914 3915 if ((n_next = rb_next(&txqi->schedule_order)) != NULL) { 3916 t_next = container_of(n_next, struct txq_info, 3917 schedule_order); 3918 a_next = to_airtime_info(&t_next->txq); 3919 } 3920 3921 if ((!a_prev || a_prev->v_t <= air_info->v_t) && 3922 (!a_next || a_next->v_t > air_info->v_t)) 3923 return; 3924 3925 if (air_sched->schedule_pos == &txqi->schedule_order) 3926 air_sched->schedule_pos = n_prev; 3927 3928 rb_erase_cached(&txqi->schedule_order, 3929 &air_sched->active_txqs); 3930 RB_CLEAR_NODE(&txqi->schedule_order); 3931 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 3932 } 3933 } 3934 3935 void ieee80211_update_airtime_weight(struct ieee80211_local *local, 3936 struct airtime_sched_info *air_sched, 3937 u64 now, bool force) 3938 { 3939 struct airtime_info *air_info, *tmp; 3940 u64 weight_sum = 0; 3941 3942 if (unlikely(!now)) 3943 now = ktime_get_boottime_ns(); 3944 3945 lockdep_assert_held(&air_sched->lock); 3946 3947 if (!force && (air_sched->last_weight_update < 3948 now - AIRTIME_ACTIVE_DURATION)) 3949 return; 3950 3951 list_for_each_entry_safe(air_info, tmp, 3952 &air_sched->active_list, list) { 3953 if (airtime_is_active(air_info, now)) 3954 weight_sum += air_info->weight; 3955 else 3956 list_del_init(&air_info->list); 3957 } 3958 airtime_weight_sum_set(air_sched, weight_sum); 3959 air_sched->last_weight_update = now; 3960 } 3961 3962 void ieee80211_schedule_txq(struct ieee80211_hw *hw, 3963 struct ieee80211_txq *txq) 3964 __acquires(txq_lock) __releases(txq_lock) 3965 { 3966 struct ieee80211_local *local = hw_to_local(hw); 3967 struct txq_info *txqi = to_txq_info(txq); 3968 struct airtime_sched_info *air_sched; 3969 u64 now = ktime_get_boottime_ns(); 3970 struct airtime_info *air_info; 3971 u8 ac = txq->ac; 3972 bool was_active; 3973 3974 air_sched = &local->airtime[ac]; 3975 air_info = to_airtime_info(txq); 3976 3977 spin_lock_bh(&air_sched->lock); 3978 was_active = airtime_is_active(air_info, now); 3979 airtime_set_active(air_sched, air_info, now); 3980 3981 if (!RB_EMPTY_NODE(&txqi->schedule_order)) 3982 goto out; 3983 3984 /* If the station has been inactive for a while, catch up its v_t so it 3985 * doesn't get indefinite priority; see comment above the definition of 3986 * AIRTIME_MAX_BEHIND. 3987 */ 3988 if ((!was_active && air_info->v_t < air_sched->v_t) || 3989 air_info->v_t < air_sched->v_t - AIRTIME_MAX_BEHIND) 3990 air_info->v_t = air_sched->v_t; 3991 3992 ieee80211_update_airtime_weight(local, air_sched, now, !was_active); 3993 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 3994 3995 out: 3996 spin_unlock_bh(&air_sched->lock); 3997 } 3998 EXPORT_SYMBOL(ieee80211_schedule_txq); 3999 4000 static void __ieee80211_unschedule_txq(struct ieee80211_hw *hw, 4001 struct ieee80211_txq *txq, 4002 bool purge) 4003 { 4004 struct ieee80211_local *local = hw_to_local(hw); 4005 struct txq_info *txqi = to_txq_info(txq); 4006 struct airtime_sched_info *air_sched; 4007 struct airtime_info *air_info; 4008 4009 air_sched = &local->airtime[txq->ac]; 4010 air_info = to_airtime_info(&txqi->txq); 4011 4012 lockdep_assert_held(&air_sched->lock); 4013 4014 if (purge) { 4015 list_del_init(&air_info->list); 4016 ieee80211_update_airtime_weight(local, air_sched, 0, true); 4017 } 4018 4019 if (RB_EMPTY_NODE(&txqi->schedule_order)) 4020 return; 4021 4022 if (air_sched->schedule_pos == &txqi->schedule_order) 4023 air_sched->schedule_pos = rb_prev(&txqi->schedule_order); 4024 4025 if (!purge) 4026 airtime_set_active(air_sched, air_info, 4027 ktime_get_boottime_ns()); 4028 4029 rb_erase_cached(&txqi->schedule_order, 4030 &air_sched->active_txqs); 4031 RB_CLEAR_NODE(&txqi->schedule_order); 4032 } 4033 4034 void ieee80211_unschedule_txq(struct ieee80211_hw *hw, 4035 struct ieee80211_txq *txq, 4036 bool purge) 4037 __acquires(txq_lock) __releases(txq_lock) 4038 { 4039 struct ieee80211_local *local = hw_to_local(hw); 4040 4041 spin_lock_bh(&local->airtime[txq->ac].lock); 4042 __ieee80211_unschedule_txq(hw, txq, purge); 4043 spin_unlock_bh(&local->airtime[txq->ac].lock); 4044 } 4045 4046 void ieee80211_return_txq(struct ieee80211_hw *hw, 4047 struct ieee80211_txq *txq, bool force) 4048 { 4049 struct ieee80211_local *local = hw_to_local(hw); 4050 struct txq_info *txqi = to_txq_info(txq); 4051 4052 spin_lock_bh(&local->airtime[txq->ac].lock); 4053 4054 if (!RB_EMPTY_NODE(&txqi->schedule_order) && !force && 4055 !txq_has_queue(txq)) 4056 __ieee80211_unschedule_txq(hw, txq, false); 4057 4058 spin_unlock_bh(&local->airtime[txq->ac].lock); 4059 } 4060 EXPORT_SYMBOL(ieee80211_return_txq); 4061 4062 DEFINE_STATIC_KEY_FALSE(aql_disable); 4063 4064 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4065 struct ieee80211_txq *txq) 4066 { 4067 struct airtime_info *air_info = to_airtime_info(txq); 4068 struct ieee80211_local *local = hw_to_local(hw); 4069 4070 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4071 return true; 4072 4073 if (static_branch_unlikely(&aql_disable)) 4074 return true; 4075 4076 if (!txq->sta) 4077 return true; 4078 4079 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4080 return true; 4081 4082 if (atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_low) 4083 return true; 4084 4085 if (atomic_read(&local->aql_total_pending_airtime) < 4086 local->aql_threshold && 4087 atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_high) 4088 return true; 4089 4090 return false; 4091 } 4092 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4093 4094 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4095 struct ieee80211_txq *txq) 4096 { 4097 struct txq_info *first_txqi = NULL, *txqi = to_txq_info(txq); 4098 struct ieee80211_local *local = hw_to_local(hw); 4099 struct airtime_sched_info *air_sched; 4100 struct airtime_info *air_info; 4101 struct rb_node *node = NULL; 4102 bool ret = false; 4103 u64 now; 4104 4105 4106 if (!ieee80211_txq_airtime_check(hw, txq)) 4107 return false; 4108 4109 air_sched = &local->airtime[txq->ac]; 4110 spin_lock_bh(&air_sched->lock); 4111 4112 if (RB_EMPTY_NODE(&txqi->schedule_order)) 4113 goto out; 4114 4115 now = ktime_get_boottime_ns(); 4116 4117 /* Like in ieee80211_next_txq(), make sure the first station in the 4118 * scheduling order is eligible for transmission to avoid starvation. 4119 */ 4120 node = rb_first_cached(&air_sched->active_txqs); 4121 if (node) { 4122 first_txqi = container_of(node, struct txq_info, 4123 schedule_order); 4124 air_info = to_airtime_info(&first_txqi->txq); 4125 4126 if (air_sched->v_t < air_info->v_t) 4127 airtime_catchup_v_t(air_sched, air_info->v_t, now); 4128 } 4129 4130 air_info = to_airtime_info(&txqi->txq); 4131 if (air_info->v_t <= air_sched->v_t) { 4132 air_sched->last_schedule_activity = now; 4133 ret = true; 4134 } 4135 4136 out: 4137 spin_unlock_bh(&air_sched->lock); 4138 return ret; 4139 } 4140 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4141 4142 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4143 { 4144 struct ieee80211_local *local = hw_to_local(hw); 4145 struct airtime_sched_info *air_sched = &local->airtime[ac]; 4146 4147 spin_lock_bh(&air_sched->lock); 4148 air_sched->schedule_pos = NULL; 4149 spin_unlock_bh(&air_sched->lock); 4150 } 4151 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4152 4153 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4154 struct net_device *dev, 4155 u32 info_flags, 4156 u32 ctrl_flags, 4157 u64 *cookie) 4158 { 4159 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4160 struct ieee80211_local *local = sdata->local; 4161 struct sta_info *sta; 4162 struct sk_buff *next; 4163 4164 if (unlikely(skb->len < ETH_HLEN)) { 4165 kfree_skb(skb); 4166 return; 4167 } 4168 4169 rcu_read_lock(); 4170 4171 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4172 goto out_free; 4173 4174 if (IS_ERR(sta)) 4175 sta = NULL; 4176 4177 if (local->ops->wake_tx_queue) { 4178 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4179 skb_set_queue_mapping(skb, queue); 4180 skb_get_hash(skb); 4181 } 4182 4183 ieee80211_aggr_check(sdata, sta, skb); 4184 4185 if (sta) { 4186 struct ieee80211_fast_tx *fast_tx; 4187 4188 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4189 4190 fast_tx = rcu_dereference(sta->fast_tx); 4191 4192 if (fast_tx && 4193 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4194 goto out; 4195 } 4196 4197 if (skb_is_gso(skb)) { 4198 struct sk_buff *segs; 4199 4200 segs = skb_gso_segment(skb, 0); 4201 if (IS_ERR(segs)) { 4202 goto out_free; 4203 } else if (segs) { 4204 consume_skb(skb); 4205 skb = segs; 4206 } 4207 } else { 4208 /* we cannot process non-linear frames on this path */ 4209 if (skb_linearize(skb)) { 4210 kfree_skb(skb); 4211 goto out; 4212 } 4213 4214 /* the frame could be fragmented, software-encrypted, and other 4215 * things so we cannot really handle checksum offload with it - 4216 * fix it up in software before we handle anything else. 4217 */ 4218 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4219 skb_set_transport_header(skb, 4220 skb_checksum_start_offset(skb)); 4221 if (skb_checksum_help(skb)) 4222 goto out_free; 4223 } 4224 } 4225 4226 skb_list_walk_safe(skb, skb, next) { 4227 skb_mark_not_on_list(skb); 4228 4229 if (skb->protocol == sdata->control_port_protocol) 4230 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4231 4232 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4233 sta, ctrl_flags, cookie); 4234 if (IS_ERR(skb)) { 4235 kfree_skb_list(next); 4236 goto out; 4237 } 4238 4239 dev_sw_netstats_tx_add(dev, 1, skb->len); 4240 4241 ieee80211_xmit(sdata, sta, skb); 4242 } 4243 goto out; 4244 out_free: 4245 kfree_skb(skb); 4246 out: 4247 rcu_read_unlock(); 4248 } 4249 4250 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4251 { 4252 struct ethhdr *eth; 4253 int err; 4254 4255 err = skb_ensure_writable(skb, ETH_HLEN); 4256 if (unlikely(err)) 4257 return err; 4258 4259 eth = (void *)skb->data; 4260 ether_addr_copy(eth->h_dest, sta->sta.addr); 4261 4262 return 0; 4263 } 4264 4265 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4266 struct net_device *dev) 4267 { 4268 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4269 const struct ethhdr *eth = (void *)skb->data; 4270 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4271 __be16 ethertype; 4272 4273 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4274 return false; 4275 4276 switch (sdata->vif.type) { 4277 case NL80211_IFTYPE_AP_VLAN: 4278 if (sdata->u.vlan.sta) 4279 return false; 4280 if (sdata->wdev.use_4addr) 4281 return false; 4282 fallthrough; 4283 case NL80211_IFTYPE_AP: 4284 /* check runtime toggle for this bss */ 4285 if (!sdata->bss->multicast_to_unicast) 4286 return false; 4287 break; 4288 default: 4289 return false; 4290 } 4291 4292 /* multicast to unicast conversion only for some payload */ 4293 ethertype = eth->h_proto; 4294 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4295 ethertype = ethvlan->h_vlan_encapsulated_proto; 4296 switch (ethertype) { 4297 case htons(ETH_P_ARP): 4298 case htons(ETH_P_IP): 4299 case htons(ETH_P_IPV6): 4300 break; 4301 default: 4302 return false; 4303 } 4304 4305 return true; 4306 } 4307 4308 static void 4309 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4310 struct sk_buff_head *queue) 4311 { 4312 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4313 struct ieee80211_local *local = sdata->local; 4314 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4315 struct sta_info *sta, *first = NULL; 4316 struct sk_buff *cloned_skb; 4317 4318 rcu_read_lock(); 4319 4320 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4321 if (sdata != sta->sdata) 4322 /* AP-VLAN mismatch */ 4323 continue; 4324 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4325 /* do not send back to source */ 4326 continue; 4327 if (!first) { 4328 first = sta; 4329 continue; 4330 } 4331 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4332 if (!cloned_skb) 4333 goto multicast; 4334 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4335 dev_kfree_skb(cloned_skb); 4336 goto multicast; 4337 } 4338 __skb_queue_tail(queue, cloned_skb); 4339 } 4340 4341 if (likely(first)) { 4342 if (unlikely(ieee80211_change_da(skb, first))) 4343 goto multicast; 4344 __skb_queue_tail(queue, skb); 4345 } else { 4346 /* no STA connected, drop */ 4347 kfree_skb(skb); 4348 skb = NULL; 4349 } 4350 4351 goto out; 4352 multicast: 4353 __skb_queue_purge(queue); 4354 __skb_queue_tail(queue, skb); 4355 out: 4356 rcu_read_unlock(); 4357 } 4358 4359 /** 4360 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4361 * @skb: packet to be sent 4362 * @dev: incoming interface 4363 * 4364 * On failure skb will be freed. 4365 */ 4366 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4367 struct net_device *dev) 4368 { 4369 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4370 struct sk_buff_head queue; 4371 4372 __skb_queue_head_init(&queue); 4373 ieee80211_convert_to_unicast(skb, dev, &queue); 4374 while ((skb = __skb_dequeue(&queue))) 4375 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4376 } else { 4377 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4378 } 4379 4380 return NETDEV_TX_OK; 4381 } 4382 4383 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4384 struct sk_buff *skb, int led_len, 4385 struct sta_info *sta, 4386 bool txpending) 4387 { 4388 struct ieee80211_local *local = sdata->local; 4389 struct ieee80211_tx_control control = {}; 4390 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4391 struct ieee80211_sta *pubsta = NULL; 4392 unsigned long flags; 4393 int q = info->hw_queue; 4394 4395 if (sta) 4396 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4397 4398 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4399 return true; 4400 4401 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4402 4403 if (local->queue_stop_reasons[q] || 4404 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4405 if (txpending) 4406 skb_queue_head(&local->pending[q], skb); 4407 else 4408 skb_queue_tail(&local->pending[q], skb); 4409 4410 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4411 4412 return false; 4413 } 4414 4415 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4416 4417 if (sta && sta->uploaded) 4418 pubsta = &sta->sta; 4419 4420 control.sta = pubsta; 4421 4422 drv_tx(local, &control, skb); 4423 4424 return true; 4425 } 4426 4427 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4428 struct net_device *dev, struct sta_info *sta, 4429 struct ieee80211_key *key, struct sk_buff *skb) 4430 { 4431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4432 struct ieee80211_local *local = sdata->local; 4433 struct tid_ampdu_tx *tid_tx; 4434 u8 tid; 4435 4436 if (local->ops->wake_tx_queue) { 4437 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4438 skb_set_queue_mapping(skb, queue); 4439 skb_get_hash(skb); 4440 } 4441 4442 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4443 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4444 goto out_free; 4445 4446 memset(info, 0, sizeof(*info)); 4447 4448 ieee80211_aggr_check(sdata, sta, skb); 4449 4450 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4451 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4452 if (tid_tx) { 4453 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4454 /* fall back to non-offload slow path */ 4455 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4456 return; 4457 } 4458 4459 info->flags |= IEEE80211_TX_CTL_AMPDU; 4460 if (tid_tx->timeout) 4461 tid_tx->last_tx = jiffies; 4462 } 4463 4464 if (unlikely(skb->sk && 4465 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4466 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4467 &info->flags, NULL); 4468 4469 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4470 4471 dev_sw_netstats_tx_add(dev, 1, skb->len); 4472 4473 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4474 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4475 4476 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4477 sdata = container_of(sdata->bss, 4478 struct ieee80211_sub_if_data, u.ap); 4479 4480 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4481 info->control.vif = &sdata->vif; 4482 4483 if (key) 4484 info->control.hw_key = &key->conf; 4485 4486 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4487 4488 return; 4489 4490 out_free: 4491 kfree_skb(skb); 4492 } 4493 4494 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4495 struct net_device *dev) 4496 { 4497 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4498 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4499 struct ieee80211_key *key; 4500 struct sta_info *sta; 4501 4502 if (unlikely(skb->len < ETH_HLEN)) { 4503 kfree_skb(skb); 4504 return NETDEV_TX_OK; 4505 } 4506 4507 rcu_read_lock(); 4508 4509 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4510 kfree_skb(skb); 4511 goto out; 4512 } 4513 4514 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4515 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4516 sdata->control_port_protocol == ehdr->h_proto)) 4517 goto skip_offload; 4518 4519 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4520 if (!key) 4521 key = rcu_dereference(sdata->default_unicast_key); 4522 4523 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4524 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4525 goto skip_offload; 4526 4527 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4528 goto out; 4529 4530 skip_offload: 4531 ieee80211_subif_start_xmit(skb, dev); 4532 out: 4533 rcu_read_unlock(); 4534 4535 return NETDEV_TX_OK; 4536 } 4537 4538 struct sk_buff * 4539 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4540 struct sk_buff *skb, u32 info_flags) 4541 { 4542 struct ieee80211_hdr *hdr; 4543 struct ieee80211_tx_data tx = { 4544 .local = sdata->local, 4545 .sdata = sdata, 4546 }; 4547 struct sta_info *sta; 4548 4549 rcu_read_lock(); 4550 4551 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4552 kfree_skb(skb); 4553 skb = ERR_PTR(-EINVAL); 4554 goto out; 4555 } 4556 4557 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4558 if (IS_ERR(skb)) 4559 goto out; 4560 4561 hdr = (void *)skb->data; 4562 tx.sta = sta_info_get(sdata, hdr->addr1); 4563 tx.skb = skb; 4564 4565 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4566 rcu_read_unlock(); 4567 kfree_skb(skb); 4568 return ERR_PTR(-EINVAL); 4569 } 4570 4571 out: 4572 rcu_read_unlock(); 4573 return skb; 4574 } 4575 4576 /* 4577 * ieee80211_clear_tx_pending may not be called in a context where 4578 * it is possible that it packets could come in again. 4579 */ 4580 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4581 { 4582 struct sk_buff *skb; 4583 int i; 4584 4585 for (i = 0; i < local->hw.queues; i++) { 4586 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4587 ieee80211_free_txskb(&local->hw, skb); 4588 } 4589 } 4590 4591 /* 4592 * Returns false if the frame couldn't be transmitted but was queued instead, 4593 * which in this case means re-queued -- take as an indication to stop sending 4594 * more pending frames. 4595 */ 4596 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4597 struct sk_buff *skb) 4598 { 4599 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4600 struct ieee80211_sub_if_data *sdata; 4601 struct sta_info *sta; 4602 struct ieee80211_hdr *hdr; 4603 bool result; 4604 struct ieee80211_chanctx_conf *chanctx_conf; 4605 4606 sdata = vif_to_sdata(info->control.vif); 4607 4608 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4609 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4610 if (unlikely(!chanctx_conf)) { 4611 dev_kfree_skb(skb); 4612 return true; 4613 } 4614 info->band = chanctx_conf->def.chan->band; 4615 result = ieee80211_tx(sdata, NULL, skb, true); 4616 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4617 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4618 dev_kfree_skb(skb); 4619 return true; 4620 } 4621 4622 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4623 sta = NULL; 4624 4625 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4626 } else { 4627 struct sk_buff_head skbs; 4628 4629 __skb_queue_head_init(&skbs); 4630 __skb_queue_tail(&skbs, skb); 4631 4632 hdr = (struct ieee80211_hdr *)skb->data; 4633 sta = sta_info_get(sdata, hdr->addr1); 4634 4635 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4636 } 4637 4638 return result; 4639 } 4640 4641 /* 4642 * Transmit all pending packets. Called from tasklet. 4643 */ 4644 void ieee80211_tx_pending(struct tasklet_struct *t) 4645 { 4646 struct ieee80211_local *local = from_tasklet(local, t, 4647 tx_pending_tasklet); 4648 unsigned long flags; 4649 int i; 4650 bool txok; 4651 4652 rcu_read_lock(); 4653 4654 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4655 for (i = 0; i < local->hw.queues; i++) { 4656 /* 4657 * If queue is stopped by something other than due to pending 4658 * frames, or we have no pending frames, proceed to next queue. 4659 */ 4660 if (local->queue_stop_reasons[i] || 4661 skb_queue_empty(&local->pending[i])) 4662 continue; 4663 4664 while (!skb_queue_empty(&local->pending[i])) { 4665 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4666 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4667 4668 if (WARN_ON(!info->control.vif)) { 4669 ieee80211_free_txskb(&local->hw, skb); 4670 continue; 4671 } 4672 4673 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4674 flags); 4675 4676 txok = ieee80211_tx_pending_skb(local, skb); 4677 spin_lock_irqsave(&local->queue_stop_reason_lock, 4678 flags); 4679 if (!txok) 4680 break; 4681 } 4682 4683 if (skb_queue_empty(&local->pending[i])) 4684 ieee80211_propagate_queue_wake(local, i); 4685 } 4686 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4687 4688 rcu_read_unlock(); 4689 } 4690 4691 /* functions for drivers to get certain frames */ 4692 4693 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4694 struct ps_data *ps, struct sk_buff *skb, 4695 bool is_template) 4696 { 4697 u8 *pos, *tim; 4698 int aid0 = 0; 4699 int i, have_bits = 0, n1, n2; 4700 4701 /* Generate bitmap for TIM only if there are any STAs in power save 4702 * mode. */ 4703 if (atomic_read(&ps->num_sta_ps) > 0) 4704 /* in the hope that this is faster than 4705 * checking byte-for-byte */ 4706 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4707 IEEE80211_MAX_AID+1); 4708 if (!is_template) { 4709 if (ps->dtim_count == 0) 4710 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4711 else 4712 ps->dtim_count--; 4713 } 4714 4715 tim = pos = skb_put(skb, 6); 4716 *pos++ = WLAN_EID_TIM; 4717 *pos++ = 4; 4718 *pos++ = ps->dtim_count; 4719 *pos++ = sdata->vif.bss_conf.dtim_period; 4720 4721 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4722 aid0 = 1; 4723 4724 ps->dtim_bc_mc = aid0 == 1; 4725 4726 if (have_bits) { 4727 /* Find largest even number N1 so that bits numbered 1 through 4728 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4729 * (N2 + 1) x 8 through 2007 are 0. */ 4730 n1 = 0; 4731 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4732 if (ps->tim[i]) { 4733 n1 = i & 0xfe; 4734 break; 4735 } 4736 } 4737 n2 = n1; 4738 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4739 if (ps->tim[i]) { 4740 n2 = i; 4741 break; 4742 } 4743 } 4744 4745 /* Bitmap control */ 4746 *pos++ = n1 | aid0; 4747 /* Part Virt Bitmap */ 4748 skb_put(skb, n2 - n1); 4749 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4750 4751 tim[1] = n2 - n1 + 4; 4752 } else { 4753 *pos++ = aid0; /* Bitmap control */ 4754 *pos++ = 0; /* Part Virt Bitmap */ 4755 } 4756 } 4757 4758 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4759 struct ps_data *ps, struct sk_buff *skb, 4760 bool is_template) 4761 { 4762 struct ieee80211_local *local = sdata->local; 4763 4764 /* 4765 * Not very nice, but we want to allow the driver to call 4766 * ieee80211_beacon_get() as a response to the set_tim() 4767 * callback. That, however, is already invoked under the 4768 * sta_lock to guarantee consistent and race-free update 4769 * of the tim bitmap in mac80211 and the driver. 4770 */ 4771 if (local->tim_in_locked_section) { 4772 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4773 } else { 4774 spin_lock_bh(&local->tim_lock); 4775 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4776 spin_unlock_bh(&local->tim_lock); 4777 } 4778 4779 return 0; 4780 } 4781 4782 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4783 struct beacon_data *beacon) 4784 { 4785 struct probe_resp *resp; 4786 u8 *beacon_data; 4787 size_t beacon_data_len; 4788 int i; 4789 u8 count = beacon->cntdwn_current_counter; 4790 4791 switch (sdata->vif.type) { 4792 case NL80211_IFTYPE_AP: 4793 beacon_data = beacon->tail; 4794 beacon_data_len = beacon->tail_len; 4795 break; 4796 case NL80211_IFTYPE_ADHOC: 4797 beacon_data = beacon->head; 4798 beacon_data_len = beacon->head_len; 4799 break; 4800 case NL80211_IFTYPE_MESH_POINT: 4801 beacon_data = beacon->head; 4802 beacon_data_len = beacon->head_len; 4803 break; 4804 default: 4805 return; 4806 } 4807 4808 rcu_read_lock(); 4809 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4810 resp = rcu_dereference(sdata->u.ap.probe_resp); 4811 4812 if (beacon->cntdwn_counter_offsets[i]) { 4813 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4814 beacon_data_len)) { 4815 rcu_read_unlock(); 4816 return; 4817 } 4818 4819 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4820 } 4821 4822 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4823 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4824 } 4825 rcu_read_unlock(); 4826 } 4827 4828 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4829 { 4830 beacon->cntdwn_current_counter--; 4831 4832 /* the counter should never reach 0 */ 4833 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4834 4835 return beacon->cntdwn_current_counter; 4836 } 4837 4838 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4839 { 4840 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4841 struct beacon_data *beacon = NULL; 4842 u8 count = 0; 4843 4844 rcu_read_lock(); 4845 4846 if (sdata->vif.type == NL80211_IFTYPE_AP) 4847 beacon = rcu_dereference(sdata->u.ap.beacon); 4848 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4849 beacon = rcu_dereference(sdata->u.ibss.presp); 4850 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4851 beacon = rcu_dereference(sdata->u.mesh.beacon); 4852 4853 if (!beacon) 4854 goto unlock; 4855 4856 count = __ieee80211_beacon_update_cntdwn(beacon); 4857 4858 unlock: 4859 rcu_read_unlock(); 4860 return count; 4861 } 4862 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4863 4864 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4865 { 4866 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4867 struct beacon_data *beacon = NULL; 4868 4869 rcu_read_lock(); 4870 4871 if (sdata->vif.type == NL80211_IFTYPE_AP) 4872 beacon = rcu_dereference(sdata->u.ap.beacon); 4873 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4874 beacon = rcu_dereference(sdata->u.ibss.presp); 4875 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4876 beacon = rcu_dereference(sdata->u.mesh.beacon); 4877 4878 if (!beacon) 4879 goto unlock; 4880 4881 if (counter < beacon->cntdwn_current_counter) 4882 beacon->cntdwn_current_counter = counter; 4883 4884 unlock: 4885 rcu_read_unlock(); 4886 } 4887 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4888 4889 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4890 { 4891 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4892 struct beacon_data *beacon = NULL; 4893 u8 *beacon_data; 4894 size_t beacon_data_len; 4895 int ret = false; 4896 4897 if (!ieee80211_sdata_running(sdata)) 4898 return false; 4899 4900 rcu_read_lock(); 4901 if (vif->type == NL80211_IFTYPE_AP) { 4902 struct ieee80211_if_ap *ap = &sdata->u.ap; 4903 4904 beacon = rcu_dereference(ap->beacon); 4905 if (WARN_ON(!beacon || !beacon->tail)) 4906 goto out; 4907 beacon_data = beacon->tail; 4908 beacon_data_len = beacon->tail_len; 4909 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4910 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4911 4912 beacon = rcu_dereference(ifibss->presp); 4913 if (!beacon) 4914 goto out; 4915 4916 beacon_data = beacon->head; 4917 beacon_data_len = beacon->head_len; 4918 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4919 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4920 4921 beacon = rcu_dereference(ifmsh->beacon); 4922 if (!beacon) 4923 goto out; 4924 4925 beacon_data = beacon->head; 4926 beacon_data_len = beacon->head_len; 4927 } else { 4928 WARN_ON(1); 4929 goto out; 4930 } 4931 4932 if (!beacon->cntdwn_counter_offsets[0]) 4933 goto out; 4934 4935 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4936 goto out; 4937 4938 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4939 ret = true; 4940 4941 out: 4942 rcu_read_unlock(); 4943 4944 return ret; 4945 } 4946 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4947 4948 static int ieee80211_beacon_protect(struct sk_buff *skb, 4949 struct ieee80211_local *local, 4950 struct ieee80211_sub_if_data *sdata) 4951 { 4952 ieee80211_tx_result res; 4953 struct ieee80211_tx_data tx; 4954 struct sk_buff *check_skb; 4955 4956 memset(&tx, 0, sizeof(tx)); 4957 tx.key = rcu_dereference(sdata->default_beacon_key); 4958 if (!tx.key) 4959 return 0; 4960 tx.local = local; 4961 tx.sdata = sdata; 4962 __skb_queue_head_init(&tx.skbs); 4963 __skb_queue_tail(&tx.skbs, skb); 4964 res = ieee80211_tx_h_encrypt(&tx); 4965 check_skb = __skb_dequeue(&tx.skbs); 4966 /* we may crash after this, but it'd be a bug in crypto */ 4967 WARN_ON(check_skb != skb); 4968 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4969 return -EINVAL; 4970 4971 return 0; 4972 } 4973 4974 static struct sk_buff * 4975 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4976 struct ieee80211_vif *vif, 4977 struct ieee80211_mutable_offsets *offs, 4978 bool is_template) 4979 { 4980 struct ieee80211_local *local = hw_to_local(hw); 4981 struct beacon_data *beacon = NULL; 4982 struct sk_buff *skb = NULL; 4983 struct ieee80211_tx_info *info; 4984 struct ieee80211_sub_if_data *sdata = NULL; 4985 enum nl80211_band band; 4986 struct ieee80211_tx_rate_control txrc; 4987 struct ieee80211_chanctx_conf *chanctx_conf; 4988 int csa_off_base = 0; 4989 4990 rcu_read_lock(); 4991 4992 sdata = vif_to_sdata(vif); 4993 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4994 4995 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4996 goto out; 4997 4998 if (offs) 4999 memset(offs, 0, sizeof(*offs)); 5000 5001 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5002 struct ieee80211_if_ap *ap = &sdata->u.ap; 5003 5004 beacon = rcu_dereference(ap->beacon); 5005 if (beacon) { 5006 if (beacon->cntdwn_counter_offsets[0]) { 5007 if (!is_template) 5008 ieee80211_beacon_update_cntdwn(vif); 5009 5010 ieee80211_set_beacon_cntdwn(sdata, beacon); 5011 } 5012 5013 /* 5014 * headroom, head length, 5015 * tail length and maximum TIM length 5016 */ 5017 skb = dev_alloc_skb(local->tx_headroom + 5018 beacon->head_len + 5019 beacon->tail_len + 256 + 5020 local->hw.extra_beacon_tailroom); 5021 if (!skb) 5022 goto out; 5023 5024 skb_reserve(skb, local->tx_headroom); 5025 skb_put_data(skb, beacon->head, beacon->head_len); 5026 5027 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 5028 is_template); 5029 5030 if (offs) { 5031 offs->tim_offset = beacon->head_len; 5032 offs->tim_length = skb->len - beacon->head_len; 5033 5034 /* for AP the csa offsets are from tail */ 5035 csa_off_base = skb->len; 5036 } 5037 5038 if (beacon->tail) 5039 skb_put_data(skb, beacon->tail, 5040 beacon->tail_len); 5041 5042 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 5043 goto out; 5044 } else 5045 goto out; 5046 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5047 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5048 struct ieee80211_hdr *hdr; 5049 5050 beacon = rcu_dereference(ifibss->presp); 5051 if (!beacon) 5052 goto out; 5053 5054 if (beacon->cntdwn_counter_offsets[0]) { 5055 if (!is_template) 5056 __ieee80211_beacon_update_cntdwn(beacon); 5057 5058 ieee80211_set_beacon_cntdwn(sdata, beacon); 5059 } 5060 5061 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5062 local->hw.extra_beacon_tailroom); 5063 if (!skb) 5064 goto out; 5065 skb_reserve(skb, local->tx_headroom); 5066 skb_put_data(skb, beacon->head, beacon->head_len); 5067 5068 hdr = (struct ieee80211_hdr *) skb->data; 5069 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5070 IEEE80211_STYPE_BEACON); 5071 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5072 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5073 5074 beacon = rcu_dereference(ifmsh->beacon); 5075 if (!beacon) 5076 goto out; 5077 5078 if (beacon->cntdwn_counter_offsets[0]) { 5079 if (!is_template) 5080 /* TODO: For mesh csa_counter is in TU, so 5081 * decrementing it by one isn't correct, but 5082 * for now we leave it consistent with overall 5083 * mac80211's behavior. 5084 */ 5085 __ieee80211_beacon_update_cntdwn(beacon); 5086 5087 ieee80211_set_beacon_cntdwn(sdata, beacon); 5088 } 5089 5090 if (ifmsh->sync_ops) 5091 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5092 5093 skb = dev_alloc_skb(local->tx_headroom + 5094 beacon->head_len + 5095 256 + /* TIM IE */ 5096 beacon->tail_len + 5097 local->hw.extra_beacon_tailroom); 5098 if (!skb) 5099 goto out; 5100 skb_reserve(skb, local->tx_headroom); 5101 skb_put_data(skb, beacon->head, beacon->head_len); 5102 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 5103 5104 if (offs) { 5105 offs->tim_offset = beacon->head_len; 5106 offs->tim_length = skb->len - beacon->head_len; 5107 } 5108 5109 skb_put_data(skb, beacon->tail, beacon->tail_len); 5110 } else { 5111 WARN_ON(1); 5112 goto out; 5113 } 5114 5115 /* CSA offsets */ 5116 if (offs && beacon) { 5117 int i; 5118 5119 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5120 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5121 5122 if (!csa_off) 5123 continue; 5124 5125 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5126 } 5127 } 5128 5129 band = chanctx_conf->def.chan->band; 5130 5131 info = IEEE80211_SKB_CB(skb); 5132 5133 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5134 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5135 info->band = band; 5136 5137 memset(&txrc, 0, sizeof(txrc)); 5138 txrc.hw = hw; 5139 txrc.sband = local->hw.wiphy->bands[band]; 5140 txrc.bss_conf = &sdata->vif.bss_conf; 5141 txrc.skb = skb; 5142 txrc.reported_rate.idx = -1; 5143 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5144 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5145 else 5146 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5147 txrc.bss = true; 5148 rate_control_get_rate(sdata, NULL, &txrc); 5149 5150 info->control.vif = vif; 5151 5152 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5153 IEEE80211_TX_CTL_ASSIGN_SEQ | 5154 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5155 out: 5156 rcu_read_unlock(); 5157 return skb; 5158 5159 } 5160 5161 struct sk_buff * 5162 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5163 struct ieee80211_vif *vif, 5164 struct ieee80211_mutable_offsets *offs) 5165 { 5166 return __ieee80211_beacon_get(hw, vif, offs, true); 5167 } 5168 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5169 5170 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5171 struct ieee80211_vif *vif, 5172 u16 *tim_offset, u16 *tim_length) 5173 { 5174 struct ieee80211_mutable_offsets offs = {}; 5175 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 5176 struct sk_buff *copy; 5177 struct ieee80211_supported_band *sband; 5178 int shift; 5179 5180 if (!bcn) 5181 return bcn; 5182 5183 if (tim_offset) 5184 *tim_offset = offs.tim_offset; 5185 5186 if (tim_length) 5187 *tim_length = offs.tim_length; 5188 5189 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5190 !hw_to_local(hw)->monitors) 5191 return bcn; 5192 5193 /* send a copy to monitor interfaces */ 5194 copy = skb_copy(bcn, GFP_ATOMIC); 5195 if (!copy) 5196 return bcn; 5197 5198 shift = ieee80211_vif_get_shift(vif); 5199 sband = ieee80211_get_sband(vif_to_sdata(vif)); 5200 if (!sband) 5201 return bcn; 5202 5203 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 5204 NULL); 5205 5206 return bcn; 5207 } 5208 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5209 5210 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5211 struct ieee80211_vif *vif) 5212 { 5213 struct ieee80211_if_ap *ap = NULL; 5214 struct sk_buff *skb = NULL; 5215 struct probe_resp *presp = NULL; 5216 struct ieee80211_hdr *hdr; 5217 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5218 5219 if (sdata->vif.type != NL80211_IFTYPE_AP) 5220 return NULL; 5221 5222 rcu_read_lock(); 5223 5224 ap = &sdata->u.ap; 5225 presp = rcu_dereference(ap->probe_resp); 5226 if (!presp) 5227 goto out; 5228 5229 skb = dev_alloc_skb(presp->len); 5230 if (!skb) 5231 goto out; 5232 5233 skb_put_data(skb, presp->data, presp->len); 5234 5235 hdr = (struct ieee80211_hdr *) skb->data; 5236 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5237 5238 out: 5239 rcu_read_unlock(); 5240 return skb; 5241 } 5242 EXPORT_SYMBOL(ieee80211_proberesp_get); 5243 5244 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5245 struct ieee80211_vif *vif) 5246 { 5247 struct sk_buff *skb = NULL; 5248 struct fils_discovery_data *tmpl = NULL; 5249 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5250 5251 if (sdata->vif.type != NL80211_IFTYPE_AP) 5252 return NULL; 5253 5254 rcu_read_lock(); 5255 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5256 if (!tmpl) { 5257 rcu_read_unlock(); 5258 return NULL; 5259 } 5260 5261 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5262 if (skb) { 5263 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5264 skb_put_data(skb, tmpl->data, tmpl->len); 5265 } 5266 5267 rcu_read_unlock(); 5268 return skb; 5269 } 5270 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5271 5272 struct sk_buff * 5273 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5274 struct ieee80211_vif *vif) 5275 { 5276 struct sk_buff *skb = NULL; 5277 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5278 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5279 5280 if (sdata->vif.type != NL80211_IFTYPE_AP) 5281 return NULL; 5282 5283 rcu_read_lock(); 5284 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5285 if (!tmpl) { 5286 rcu_read_unlock(); 5287 return NULL; 5288 } 5289 5290 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5291 if (skb) { 5292 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5293 skb_put_data(skb, tmpl->data, tmpl->len); 5294 } 5295 5296 rcu_read_unlock(); 5297 return skb; 5298 } 5299 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5300 5301 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5302 struct ieee80211_vif *vif) 5303 { 5304 struct ieee80211_sub_if_data *sdata; 5305 struct ieee80211_if_managed *ifmgd; 5306 struct ieee80211_pspoll *pspoll; 5307 struct ieee80211_local *local; 5308 struct sk_buff *skb; 5309 5310 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5311 return NULL; 5312 5313 sdata = vif_to_sdata(vif); 5314 ifmgd = &sdata->u.mgd; 5315 local = sdata->local; 5316 5317 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5318 if (!skb) 5319 return NULL; 5320 5321 skb_reserve(skb, local->hw.extra_tx_headroom); 5322 5323 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5324 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5325 IEEE80211_STYPE_PSPOLL); 5326 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5327 5328 /* aid in PS-Poll has its two MSBs each set to 1 */ 5329 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5330 5331 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5332 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5333 5334 return skb; 5335 } 5336 EXPORT_SYMBOL(ieee80211_pspoll_get); 5337 5338 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5339 struct ieee80211_vif *vif, 5340 bool qos_ok) 5341 { 5342 struct ieee80211_hdr_3addr *nullfunc; 5343 struct ieee80211_sub_if_data *sdata; 5344 struct ieee80211_if_managed *ifmgd; 5345 struct ieee80211_local *local; 5346 struct sk_buff *skb; 5347 bool qos = false; 5348 5349 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5350 return NULL; 5351 5352 sdata = vif_to_sdata(vif); 5353 ifmgd = &sdata->u.mgd; 5354 local = sdata->local; 5355 5356 if (qos_ok) { 5357 struct sta_info *sta; 5358 5359 rcu_read_lock(); 5360 sta = sta_info_get(sdata, ifmgd->bssid); 5361 qos = sta && sta->sta.wme; 5362 rcu_read_unlock(); 5363 } 5364 5365 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5366 sizeof(*nullfunc) + 2); 5367 if (!skb) 5368 return NULL; 5369 5370 skb_reserve(skb, local->hw.extra_tx_headroom); 5371 5372 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5373 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5374 IEEE80211_STYPE_NULLFUNC | 5375 IEEE80211_FCTL_TODS); 5376 if (qos) { 5377 __le16 qoshdr = cpu_to_le16(7); 5378 5379 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5380 IEEE80211_STYPE_NULLFUNC) != 5381 IEEE80211_STYPE_QOS_NULLFUNC); 5382 nullfunc->frame_control |= 5383 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5384 skb->priority = 7; 5385 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5386 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5387 } 5388 5389 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5390 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5391 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5392 5393 return skb; 5394 } 5395 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5396 5397 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5398 const u8 *src_addr, 5399 const u8 *ssid, size_t ssid_len, 5400 size_t tailroom) 5401 { 5402 struct ieee80211_local *local = hw_to_local(hw); 5403 struct ieee80211_hdr_3addr *hdr; 5404 struct sk_buff *skb; 5405 size_t ie_ssid_len; 5406 u8 *pos; 5407 5408 ie_ssid_len = 2 + ssid_len; 5409 5410 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5411 ie_ssid_len + tailroom); 5412 if (!skb) 5413 return NULL; 5414 5415 skb_reserve(skb, local->hw.extra_tx_headroom); 5416 5417 hdr = skb_put_zero(skb, sizeof(*hdr)); 5418 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5419 IEEE80211_STYPE_PROBE_REQ); 5420 eth_broadcast_addr(hdr->addr1); 5421 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5422 eth_broadcast_addr(hdr->addr3); 5423 5424 pos = skb_put(skb, ie_ssid_len); 5425 *pos++ = WLAN_EID_SSID; 5426 *pos++ = ssid_len; 5427 if (ssid_len) 5428 memcpy(pos, ssid, ssid_len); 5429 pos += ssid_len; 5430 5431 return skb; 5432 } 5433 EXPORT_SYMBOL(ieee80211_probereq_get); 5434 5435 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5436 const void *frame, size_t frame_len, 5437 const struct ieee80211_tx_info *frame_txctl, 5438 struct ieee80211_rts *rts) 5439 { 5440 const struct ieee80211_hdr *hdr = frame; 5441 5442 rts->frame_control = 5443 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5444 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5445 frame_txctl); 5446 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5447 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5448 } 5449 EXPORT_SYMBOL(ieee80211_rts_get); 5450 5451 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5452 const void *frame, size_t frame_len, 5453 const struct ieee80211_tx_info *frame_txctl, 5454 struct ieee80211_cts *cts) 5455 { 5456 const struct ieee80211_hdr *hdr = frame; 5457 5458 cts->frame_control = 5459 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5460 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5461 frame_len, frame_txctl); 5462 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5463 } 5464 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5465 5466 struct sk_buff * 5467 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5468 struct ieee80211_vif *vif) 5469 { 5470 struct ieee80211_local *local = hw_to_local(hw); 5471 struct sk_buff *skb = NULL; 5472 struct ieee80211_tx_data tx; 5473 struct ieee80211_sub_if_data *sdata; 5474 struct ps_data *ps; 5475 struct ieee80211_tx_info *info; 5476 struct ieee80211_chanctx_conf *chanctx_conf; 5477 5478 sdata = vif_to_sdata(vif); 5479 5480 rcu_read_lock(); 5481 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5482 5483 if (!chanctx_conf) 5484 goto out; 5485 5486 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5487 struct beacon_data *beacon = 5488 rcu_dereference(sdata->u.ap.beacon); 5489 5490 if (!beacon || !beacon->head) 5491 goto out; 5492 5493 ps = &sdata->u.ap.ps; 5494 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5495 ps = &sdata->u.mesh.ps; 5496 } else { 5497 goto out; 5498 } 5499 5500 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5501 goto out; /* send buffered bc/mc only after DTIM beacon */ 5502 5503 while (1) { 5504 skb = skb_dequeue(&ps->bc_buf); 5505 if (!skb) 5506 goto out; 5507 local->total_ps_buffered--; 5508 5509 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5510 struct ieee80211_hdr *hdr = 5511 (struct ieee80211_hdr *) skb->data; 5512 /* more buffered multicast/broadcast frames ==> set 5513 * MoreData flag in IEEE 802.11 header to inform PS 5514 * STAs */ 5515 hdr->frame_control |= 5516 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5517 } 5518 5519 if (sdata->vif.type == NL80211_IFTYPE_AP) 5520 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5521 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5522 break; 5523 ieee80211_free_txskb(hw, skb); 5524 } 5525 5526 info = IEEE80211_SKB_CB(skb); 5527 5528 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5529 info->band = chanctx_conf->def.chan->band; 5530 5531 if (invoke_tx_handlers(&tx)) 5532 skb = NULL; 5533 out: 5534 rcu_read_unlock(); 5535 5536 return skb; 5537 } 5538 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5539 5540 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5541 { 5542 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5543 struct ieee80211_sub_if_data *sdata = sta->sdata; 5544 struct ieee80211_local *local = sdata->local; 5545 int ret; 5546 u32 queues; 5547 5548 lockdep_assert_held(&local->sta_mtx); 5549 5550 /* only some cases are supported right now */ 5551 switch (sdata->vif.type) { 5552 case NL80211_IFTYPE_STATION: 5553 case NL80211_IFTYPE_AP: 5554 case NL80211_IFTYPE_AP_VLAN: 5555 break; 5556 default: 5557 WARN_ON(1); 5558 return -EINVAL; 5559 } 5560 5561 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5562 return -EINVAL; 5563 5564 if (sta->reserved_tid == tid) { 5565 ret = 0; 5566 goto out; 5567 } 5568 5569 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5570 sdata_err(sdata, "TID reservation already active\n"); 5571 ret = -EALREADY; 5572 goto out; 5573 } 5574 5575 ieee80211_stop_vif_queues(sdata->local, sdata, 5576 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5577 5578 synchronize_net(); 5579 5580 /* Tear down BA sessions so we stop aggregating on this TID */ 5581 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5582 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5583 __ieee80211_stop_tx_ba_session(sta, tid, 5584 AGG_STOP_LOCAL_REQUEST); 5585 } 5586 5587 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5588 __ieee80211_flush_queues(local, sdata, queues, false); 5589 5590 sta->reserved_tid = tid; 5591 5592 ieee80211_wake_vif_queues(local, sdata, 5593 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5594 5595 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5596 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5597 5598 ret = 0; 5599 out: 5600 return ret; 5601 } 5602 EXPORT_SYMBOL(ieee80211_reserve_tid); 5603 5604 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5605 { 5606 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5607 struct ieee80211_sub_if_data *sdata = sta->sdata; 5608 5609 lockdep_assert_held(&sdata->local->sta_mtx); 5610 5611 /* only some cases are supported right now */ 5612 switch (sdata->vif.type) { 5613 case NL80211_IFTYPE_STATION: 5614 case NL80211_IFTYPE_AP: 5615 case NL80211_IFTYPE_AP_VLAN: 5616 break; 5617 default: 5618 WARN_ON(1); 5619 return; 5620 } 5621 5622 if (tid != sta->reserved_tid) { 5623 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5624 return; 5625 } 5626 5627 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5628 } 5629 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5630 5631 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5632 struct sk_buff *skb, int tid, 5633 enum nl80211_band band) 5634 { 5635 int ac = ieee80211_ac_from_tid(tid); 5636 5637 skb_reset_mac_header(skb); 5638 skb_set_queue_mapping(skb, ac); 5639 skb->priority = tid; 5640 5641 skb->dev = sdata->dev; 5642 5643 /* 5644 * The other path calling ieee80211_xmit is from the tasklet, 5645 * and while we can handle concurrent transmissions locking 5646 * requirements are that we do not come into tx with bhs on. 5647 */ 5648 local_bh_disable(); 5649 IEEE80211_SKB_CB(skb)->band = band; 5650 ieee80211_xmit(sdata, NULL, skb); 5651 local_bh_enable(); 5652 } 5653 5654 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5655 const u8 *buf, size_t len, 5656 const u8 *dest, __be16 proto, bool unencrypted, 5657 u64 *cookie) 5658 { 5659 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5660 struct ieee80211_local *local = sdata->local; 5661 struct sta_info *sta; 5662 struct sk_buff *skb; 5663 struct ethhdr *ehdr; 5664 u32 ctrl_flags = 0; 5665 u32 flags = 0; 5666 5667 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5668 * or Pre-Authentication 5669 */ 5670 if (proto != sdata->control_port_protocol && 5671 proto != cpu_to_be16(ETH_P_PREAUTH)) 5672 return -EINVAL; 5673 5674 if (proto == sdata->control_port_protocol) 5675 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5676 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5677 5678 if (unencrypted) 5679 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5680 5681 if (cookie) 5682 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5683 5684 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5685 5686 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5687 sizeof(struct ethhdr) + len); 5688 if (!skb) 5689 return -ENOMEM; 5690 5691 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5692 5693 skb_put_data(skb, buf, len); 5694 5695 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5696 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5697 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5698 ehdr->h_proto = proto; 5699 5700 skb->dev = dev; 5701 skb->protocol = proto; 5702 skb_reset_network_header(skb); 5703 skb_reset_mac_header(skb); 5704 5705 /* update QoS header to prioritize control port frames if possible, 5706 * priorization also happens for control port frames send over 5707 * AF_PACKET 5708 */ 5709 rcu_read_lock(); 5710 5711 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5712 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5713 5714 skb_set_queue_mapping(skb, queue); 5715 skb_get_hash(skb); 5716 } 5717 5718 rcu_read_unlock(); 5719 5720 /* mutex lock is only needed for incrementing the cookie counter */ 5721 mutex_lock(&local->mtx); 5722 5723 local_bh_disable(); 5724 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5725 local_bh_enable(); 5726 5727 mutex_unlock(&local->mtx); 5728 5729 return 0; 5730 } 5731 5732 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5733 const u8 *buf, size_t len) 5734 { 5735 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5736 struct ieee80211_local *local = sdata->local; 5737 struct sk_buff *skb; 5738 5739 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5740 30 + /* header size */ 5741 18); /* 11s header size */ 5742 if (!skb) 5743 return -ENOMEM; 5744 5745 skb_reserve(skb, local->hw.extra_tx_headroom); 5746 skb_put_data(skb, buf, len); 5747 5748 skb->dev = dev; 5749 skb->protocol = htons(ETH_P_802_3); 5750 skb_reset_network_header(skb); 5751 skb_reset_mac_header(skb); 5752 5753 local_bh_disable(); 5754 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5755 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5756 NULL); 5757 local_bh_enable(); 5758 5759 return 0; 5760 } 5761