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 case NL80211_BAND_LC: { 151 u32 flag; 152 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 153 flag = IEEE80211_RATE_MANDATORY_G; 154 else 155 flag = IEEE80211_RATE_MANDATORY_B; 156 if (r->flags & flag) 157 mrate = r->bitrate; 158 break; 159 } 160 case NL80211_BAND_5GHZ: 161 case NL80211_BAND_6GHZ: 162 if (r->flags & IEEE80211_RATE_MANDATORY_A) 163 mrate = r->bitrate; 164 break; 165 case NL80211_BAND_S1GHZ: 166 case NL80211_BAND_60GHZ: 167 /* TODO, for now fall through */ 168 case NUM_NL80211_BANDS: 169 WARN_ON(1); 170 break; 171 } 172 } 173 if (rate == -1) { 174 /* No matching basic rate found; use highest suitable mandatory 175 * PHY rate */ 176 rate = DIV_ROUND_UP(mrate, 1 << shift); 177 } 178 179 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 180 if (ieee80211_is_data_qos(hdr->frame_control) && 181 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 182 dur = 0; 183 else 184 /* Time needed to transmit ACK 185 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 186 * to closest integer */ 187 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 188 tx->sdata->vif.bss_conf.use_short_preamble, 189 shift); 190 191 if (next_frag_len) { 192 /* Frame is fragmented: duration increases with time needed to 193 * transmit next fragment plus ACK and 2 x SIFS. */ 194 dur *= 2; /* ACK + SIFS */ 195 /* next fragment */ 196 dur += ieee80211_frame_duration(sband->band, next_frag_len, 197 txrate->bitrate, erp, 198 tx->sdata->vif.bss_conf.use_short_preamble, 199 shift); 200 } 201 202 return cpu_to_le16(dur); 203 } 204 205 /* tx handlers */ 206 static ieee80211_tx_result debug_noinline 207 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 208 { 209 struct ieee80211_local *local = tx->local; 210 struct ieee80211_if_managed *ifmgd; 211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 212 213 /* driver doesn't support power save */ 214 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 215 return TX_CONTINUE; 216 217 /* hardware does dynamic power save */ 218 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 219 return TX_CONTINUE; 220 221 /* dynamic power save disabled */ 222 if (local->hw.conf.dynamic_ps_timeout <= 0) 223 return TX_CONTINUE; 224 225 /* we are scanning, don't enable power save */ 226 if (local->scanning) 227 return TX_CONTINUE; 228 229 if (!local->ps_sdata) 230 return TX_CONTINUE; 231 232 /* No point if we're going to suspend */ 233 if (local->quiescing) 234 return TX_CONTINUE; 235 236 /* dynamic ps is supported only in managed mode */ 237 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 238 return TX_CONTINUE; 239 240 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 241 return TX_CONTINUE; 242 243 ifmgd = &tx->sdata->u.mgd; 244 245 /* 246 * Don't wakeup from power save if u-apsd is enabled, voip ac has 247 * u-apsd enabled and the frame is in voip class. This effectively 248 * means that even if all access categories have u-apsd enabled, in 249 * practise u-apsd is only used with the voip ac. This is a 250 * workaround for the case when received voip class packets do not 251 * have correct qos tag for some reason, due the network or the 252 * peer application. 253 * 254 * Note: ifmgd->uapsd_queues access is racy here. If the value is 255 * changed via debugfs, user needs to reassociate manually to have 256 * everything in sync. 257 */ 258 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 259 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 260 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 261 return TX_CONTINUE; 262 263 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 264 ieee80211_stop_queues_by_reason(&local->hw, 265 IEEE80211_MAX_QUEUE_MAP, 266 IEEE80211_QUEUE_STOP_REASON_PS, 267 false); 268 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 269 ieee80211_queue_work(&local->hw, 270 &local->dynamic_ps_disable_work); 271 } 272 273 /* Don't restart the timer if we're not disassociated */ 274 if (!ifmgd->associated) 275 return TX_CONTINUE; 276 277 mod_timer(&local->dynamic_ps_timer, jiffies + 278 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 279 280 return TX_CONTINUE; 281 } 282 283 static ieee80211_tx_result debug_noinline 284 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 285 { 286 287 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 288 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 289 bool assoc = false; 290 291 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 292 return TX_CONTINUE; 293 294 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 295 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 296 !ieee80211_is_probe_req(hdr->frame_control) && 297 !ieee80211_is_any_nullfunc(hdr->frame_control)) 298 /* 299 * When software scanning only nullfunc frames (to notify 300 * the sleep state to the AP) and probe requests (for the 301 * active scan) are allowed, all other frames should not be 302 * sent and we should not get here, but if we do 303 * nonetheless, drop them to avoid sending them 304 * off-channel. See the link below and 305 * ieee80211_start_scan() for more. 306 * 307 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 308 */ 309 return TX_DROP; 310 311 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 312 return TX_CONTINUE; 313 314 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 315 return TX_CONTINUE; 316 317 if (tx->sta) 318 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 319 320 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 321 if (unlikely(!assoc && 322 ieee80211_is_data(hdr->frame_control))) { 323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 324 sdata_info(tx->sdata, 325 "dropped data frame to not associated station %pM\n", 326 hdr->addr1); 327 #endif 328 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 329 return TX_DROP; 330 } 331 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 332 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 333 /* 334 * No associated STAs - no need to send multicast 335 * frames. 336 */ 337 return TX_DROP; 338 } 339 340 return TX_CONTINUE; 341 } 342 343 /* This function is called whenever the AP is about to exceed the maximum limit 344 * of buffered frames for power saving STAs. This situation should not really 345 * happen often during normal operation, so dropping the oldest buffered packet 346 * from each queue should be OK to make some room for new frames. */ 347 static void purge_old_ps_buffers(struct ieee80211_local *local) 348 { 349 int total = 0, purged = 0; 350 struct sk_buff *skb; 351 struct ieee80211_sub_if_data *sdata; 352 struct sta_info *sta; 353 354 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 355 struct ps_data *ps; 356 357 if (sdata->vif.type == NL80211_IFTYPE_AP) 358 ps = &sdata->u.ap.ps; 359 else if (ieee80211_vif_is_mesh(&sdata->vif)) 360 ps = &sdata->u.mesh.ps; 361 else 362 continue; 363 364 skb = skb_dequeue(&ps->bc_buf); 365 if (skb) { 366 purged++; 367 ieee80211_free_txskb(&local->hw, skb); 368 } 369 total += skb_queue_len(&ps->bc_buf); 370 } 371 372 /* 373 * Drop one frame from each station from the lowest-priority 374 * AC that has frames at all. 375 */ 376 list_for_each_entry_rcu(sta, &local->sta_list, list) { 377 int ac; 378 379 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 380 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 381 total += skb_queue_len(&sta->ps_tx_buf[ac]); 382 if (skb) { 383 purged++; 384 ieee80211_free_txskb(&local->hw, skb); 385 break; 386 } 387 } 388 } 389 390 local->total_ps_buffered = total; 391 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 392 } 393 394 static ieee80211_tx_result 395 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 396 { 397 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 398 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 399 struct ps_data *ps; 400 401 /* 402 * broadcast/multicast frame 403 * 404 * If any of the associated/peer stations is in power save mode, 405 * the frame is buffered to be sent after DTIM beacon frame. 406 * This is done either by the hardware or us. 407 */ 408 409 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 410 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 411 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 412 if (!tx->sdata->bss) 413 return TX_CONTINUE; 414 415 ps = &tx->sdata->bss->ps; 416 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 417 ps = &tx->sdata->u.mesh.ps; 418 } else { 419 return TX_CONTINUE; 420 } 421 422 423 /* no buffering for ordered frames */ 424 if (ieee80211_has_order(hdr->frame_control)) 425 return TX_CONTINUE; 426 427 if (ieee80211_is_probe_req(hdr->frame_control)) 428 return TX_CONTINUE; 429 430 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 431 info->hw_queue = tx->sdata->vif.cab_queue; 432 433 /* no stations in PS mode and no buffered packets */ 434 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 435 return TX_CONTINUE; 436 437 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 438 439 /* device releases frame after DTIM beacon */ 440 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 441 return TX_CONTINUE; 442 443 /* buffered in mac80211 */ 444 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 445 purge_old_ps_buffers(tx->local); 446 447 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 448 ps_dbg(tx->sdata, 449 "BC TX buffer full - dropping the oldest frame\n"); 450 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 451 } else 452 tx->local->total_ps_buffered++; 453 454 skb_queue_tail(&ps->bc_buf, tx->skb); 455 456 return TX_QUEUED; 457 } 458 459 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 460 struct sk_buff *skb) 461 { 462 if (!ieee80211_is_mgmt(fc)) 463 return 0; 464 465 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 466 return 0; 467 468 if (!ieee80211_is_robust_mgmt_frame(skb)) 469 return 0; 470 471 return 1; 472 } 473 474 static ieee80211_tx_result 475 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 476 { 477 struct sta_info *sta = tx->sta; 478 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 479 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 480 struct ieee80211_local *local = tx->local; 481 482 if (unlikely(!sta)) 483 return TX_CONTINUE; 484 485 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 486 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 487 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 488 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 489 int ac = skb_get_queue_mapping(tx->skb); 490 491 if (ieee80211_is_mgmt(hdr->frame_control) && 492 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 493 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 494 return TX_CONTINUE; 495 } 496 497 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 498 sta->sta.addr, sta->sta.aid, ac); 499 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 500 purge_old_ps_buffers(tx->local); 501 502 /* sync with ieee80211_sta_ps_deliver_wakeup */ 503 spin_lock(&sta->ps_lock); 504 /* 505 * STA woke up the meantime and all the frames on ps_tx_buf have 506 * been queued to pending queue. No reordering can happen, go 507 * ahead and Tx the packet. 508 */ 509 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 510 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 511 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 512 spin_unlock(&sta->ps_lock); 513 return TX_CONTINUE; 514 } 515 516 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 517 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 518 ps_dbg(tx->sdata, 519 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 520 sta->sta.addr, ac); 521 ieee80211_free_txskb(&local->hw, old); 522 } else 523 tx->local->total_ps_buffered++; 524 525 info->control.jiffies = jiffies; 526 info->control.vif = &tx->sdata->vif; 527 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 528 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 529 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 530 spin_unlock(&sta->ps_lock); 531 532 if (!timer_pending(&local->sta_cleanup)) 533 mod_timer(&local->sta_cleanup, 534 round_jiffies(jiffies + 535 STA_INFO_CLEANUP_INTERVAL)); 536 537 /* 538 * We queued up some frames, so the TIM bit might 539 * need to be set, recalculate it. 540 */ 541 sta_info_recalc_tim(sta); 542 543 return TX_QUEUED; 544 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 545 ps_dbg(tx->sdata, 546 "STA %pM in PS mode, but polling/in SP -> send frame\n", 547 sta->sta.addr); 548 } 549 550 return TX_CONTINUE; 551 } 552 553 static ieee80211_tx_result debug_noinline 554 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 555 { 556 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 557 return TX_CONTINUE; 558 559 if (tx->flags & IEEE80211_TX_UNICAST) 560 return ieee80211_tx_h_unicast_ps_buf(tx); 561 else 562 return ieee80211_tx_h_multicast_ps_buf(tx); 563 } 564 565 static ieee80211_tx_result debug_noinline 566 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 567 { 568 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 569 570 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 571 if (tx->sdata->control_port_no_encrypt) 572 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 573 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 574 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 575 } 576 577 return TX_CONTINUE; 578 } 579 580 static ieee80211_tx_result debug_noinline 581 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 582 { 583 struct ieee80211_key *key; 584 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 585 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 586 587 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 588 tx->key = NULL; 589 return TX_CONTINUE; 590 } 591 592 if (tx->sta && 593 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 594 tx->key = key; 595 else if (ieee80211_is_group_privacy_action(tx->skb) && 596 (key = rcu_dereference(tx->sdata->default_multicast_key))) 597 tx->key = key; 598 else if (ieee80211_is_mgmt(hdr->frame_control) && 599 is_multicast_ether_addr(hdr->addr1) && 600 ieee80211_is_robust_mgmt_frame(tx->skb) && 601 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 602 tx->key = key; 603 else if (is_multicast_ether_addr(hdr->addr1) && 604 (key = rcu_dereference(tx->sdata->default_multicast_key))) 605 tx->key = key; 606 else if (!is_multicast_ether_addr(hdr->addr1) && 607 (key = rcu_dereference(tx->sdata->default_unicast_key))) 608 tx->key = key; 609 else 610 tx->key = NULL; 611 612 if (tx->key) { 613 bool skip_hw = false; 614 615 /* TODO: add threshold stuff again */ 616 617 switch (tx->key->conf.cipher) { 618 case WLAN_CIPHER_SUITE_WEP40: 619 case WLAN_CIPHER_SUITE_WEP104: 620 case WLAN_CIPHER_SUITE_TKIP: 621 if (!ieee80211_is_data_present(hdr->frame_control)) 622 tx->key = NULL; 623 break; 624 case WLAN_CIPHER_SUITE_CCMP: 625 case WLAN_CIPHER_SUITE_CCMP_256: 626 case WLAN_CIPHER_SUITE_GCMP: 627 case WLAN_CIPHER_SUITE_GCMP_256: 628 if (!ieee80211_is_data_present(hdr->frame_control) && 629 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 630 tx->skb) && 631 !ieee80211_is_group_privacy_action(tx->skb)) 632 tx->key = NULL; 633 else 634 skip_hw = (tx->key->conf.flags & 635 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 636 ieee80211_is_mgmt(hdr->frame_control); 637 break; 638 case WLAN_CIPHER_SUITE_AES_CMAC: 639 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 640 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 641 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 642 if (!ieee80211_is_mgmt(hdr->frame_control)) 643 tx->key = NULL; 644 break; 645 } 646 647 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 648 !ieee80211_is_deauth(hdr->frame_control))) 649 return TX_DROP; 650 651 if (!skip_hw && tx->key && 652 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 653 info->control.hw_key = &tx->key->conf; 654 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 655 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 656 return TX_DROP; 657 } 658 659 return TX_CONTINUE; 660 } 661 662 static ieee80211_tx_result debug_noinline 663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 664 { 665 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 666 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 667 struct ieee80211_supported_band *sband; 668 u32 len; 669 struct ieee80211_tx_rate_control txrc; 670 struct ieee80211_sta_rates *ratetbl = NULL; 671 bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 672 bool assoc = false; 673 674 memset(&txrc, 0, sizeof(txrc)); 675 676 sband = tx->local->hw.wiphy->bands[info->band]; 677 678 len = min_t(u32, tx->skb->len + FCS_LEN, 679 tx->local->hw.wiphy->frag_threshold); 680 681 /* set up the tx rate control struct we give the RC algo */ 682 txrc.hw = &tx->local->hw; 683 txrc.sband = sband; 684 txrc.bss_conf = &tx->sdata->vif.bss_conf; 685 txrc.skb = tx->skb; 686 txrc.reported_rate.idx = -1; 687 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 688 689 if (tx->sdata->rc_has_mcs_mask[info->band]) 690 txrc.rate_idx_mcs_mask = 691 tx->sdata->rc_rateidx_mcs_mask[info->band]; 692 693 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 694 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 695 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 696 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 697 698 /* set up RTS protection if desired */ 699 if (len > tx->local->hw.wiphy->rts_threshold) { 700 txrc.rts = true; 701 } 702 703 info->control.use_rts = txrc.rts; 704 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 705 706 /* 707 * Use short preamble if the BSS can handle it, but not for 708 * management frames unless we know the receiver can handle 709 * that -- the management frame might be to a station that 710 * just wants a probe response. 711 */ 712 if (tx->sdata->vif.bss_conf.use_short_preamble && 713 (ieee80211_is_tx_data(tx->skb) || 714 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 715 txrc.short_preamble = true; 716 717 info->control.short_preamble = txrc.short_preamble; 718 719 /* don't ask rate control when rate already injected via radiotap */ 720 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 721 return TX_CONTINUE; 722 723 if (tx->sta) 724 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 725 726 /* 727 * Lets not bother rate control if we're associated and cannot 728 * talk to the sta. This should not happen. 729 */ 730 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 731 !rate_usable_index_exists(sband, &tx->sta->sta), 732 "%s: Dropped data frame as no usable bitrate found while " 733 "scanning and associated. Target station: " 734 "%pM on %d GHz band\n", 735 tx->sdata->name, 736 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 737 info->band ? 5 : 2)) 738 return TX_DROP; 739 740 /* 741 * If we're associated with the sta at this point we know we can at 742 * least send the frame at the lowest bit rate. 743 */ 744 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 745 746 if (tx->sta && !info->control.skip_table) 747 ratetbl = rcu_dereference(tx->sta->sta.rates); 748 749 if (unlikely(info->control.rates[0].idx < 0)) { 750 if (ratetbl) { 751 struct ieee80211_tx_rate rate = { 752 .idx = ratetbl->rate[0].idx, 753 .flags = ratetbl->rate[0].flags, 754 .count = ratetbl->rate[0].count 755 }; 756 757 if (ratetbl->rate[0].idx < 0) 758 return TX_DROP; 759 760 tx->rate = rate; 761 } else { 762 return TX_DROP; 763 } 764 } else { 765 tx->rate = info->control.rates[0]; 766 } 767 768 if (txrc.reported_rate.idx < 0) { 769 txrc.reported_rate = tx->rate; 770 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 771 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 772 } else if (tx->sta) 773 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 774 775 if (ratetbl) 776 return TX_CONTINUE; 777 778 if (unlikely(!info->control.rates[0].count)) 779 info->control.rates[0].count = 1; 780 781 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 782 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 783 info->control.rates[0].count = 1; 784 785 return TX_CONTINUE; 786 } 787 788 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 789 { 790 u16 *seq = &sta->tid_seq[tid]; 791 __le16 ret = cpu_to_le16(*seq); 792 793 /* Increase the sequence number. */ 794 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 795 796 return ret; 797 } 798 799 static ieee80211_tx_result debug_noinline 800 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 801 { 802 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 803 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 804 int tid; 805 806 /* 807 * Packet injection may want to control the sequence 808 * number, if we have no matching interface then we 809 * neither assign one ourselves nor ask the driver to. 810 */ 811 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 812 return TX_CONTINUE; 813 814 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 815 return TX_CONTINUE; 816 817 if (ieee80211_hdrlen(hdr->frame_control) < 24) 818 return TX_CONTINUE; 819 820 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 821 return TX_CONTINUE; 822 823 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 824 return TX_CONTINUE; 825 826 /* 827 * Anything but QoS data that has a sequence number field 828 * (is long enough) gets a sequence number from the global 829 * counter. QoS data frames with a multicast destination 830 * also use the global counter (802.11-2012 9.3.2.10). 831 */ 832 if (!ieee80211_is_data_qos(hdr->frame_control) || 833 is_multicast_ether_addr(hdr->addr1)) { 834 /* driver should assign sequence number */ 835 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 836 /* for pure STA mode without beacons, we can do it */ 837 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 838 tx->sdata->sequence_number += 0x10; 839 if (tx->sta) 840 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 841 return TX_CONTINUE; 842 } 843 844 /* 845 * This should be true for injected/management frames only, for 846 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 847 * above since they are not QoS-data frames. 848 */ 849 if (!tx->sta) 850 return TX_CONTINUE; 851 852 /* include per-STA, per-TID sequence counter */ 853 tid = ieee80211_get_tid(hdr); 854 tx->sta->deflink.tx_stats.msdu[tid]++; 855 856 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 857 858 return TX_CONTINUE; 859 } 860 861 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 862 struct sk_buff *skb, int hdrlen, 863 int frag_threshold) 864 { 865 struct ieee80211_local *local = tx->local; 866 struct ieee80211_tx_info *info; 867 struct sk_buff *tmp; 868 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 869 int pos = hdrlen + per_fragm; 870 int rem = skb->len - hdrlen - per_fragm; 871 872 if (WARN_ON(rem < 0)) 873 return -EINVAL; 874 875 /* first fragment was already added to queue by caller */ 876 877 while (rem) { 878 int fraglen = per_fragm; 879 880 if (fraglen > rem) 881 fraglen = rem; 882 rem -= fraglen; 883 tmp = dev_alloc_skb(local->tx_headroom + 884 frag_threshold + 885 tx->sdata->encrypt_headroom + 886 IEEE80211_ENCRYPT_TAILROOM); 887 if (!tmp) 888 return -ENOMEM; 889 890 __skb_queue_tail(&tx->skbs, tmp); 891 892 skb_reserve(tmp, 893 local->tx_headroom + tx->sdata->encrypt_headroom); 894 895 /* copy control information */ 896 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 897 898 info = IEEE80211_SKB_CB(tmp); 899 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 900 IEEE80211_TX_CTL_FIRST_FRAGMENT); 901 902 if (rem) 903 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 904 905 skb_copy_queue_mapping(tmp, skb); 906 tmp->priority = skb->priority; 907 tmp->dev = skb->dev; 908 909 /* copy header and data */ 910 skb_put_data(tmp, skb->data, hdrlen); 911 skb_put_data(tmp, skb->data + pos, fraglen); 912 913 pos += fraglen; 914 } 915 916 /* adjust first fragment's length */ 917 skb_trim(skb, hdrlen + per_fragm); 918 return 0; 919 } 920 921 static ieee80211_tx_result debug_noinline 922 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 923 { 924 struct sk_buff *skb = tx->skb; 925 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 926 struct ieee80211_hdr *hdr = (void *)skb->data; 927 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 928 int hdrlen; 929 int fragnum; 930 931 /* no matter what happens, tx->skb moves to tx->skbs */ 932 __skb_queue_tail(&tx->skbs, skb); 933 tx->skb = NULL; 934 935 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 936 return TX_CONTINUE; 937 938 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 939 return TX_CONTINUE; 940 941 /* 942 * Warn when submitting a fragmented A-MPDU frame and drop it. 943 * This scenario is handled in ieee80211_tx_prepare but extra 944 * caution taken here as fragmented ampdu may cause Tx stop. 945 */ 946 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 947 return TX_DROP; 948 949 hdrlen = ieee80211_hdrlen(hdr->frame_control); 950 951 /* internal error, why isn't DONTFRAG set? */ 952 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 953 return TX_DROP; 954 955 /* 956 * Now fragment the frame. This will allocate all the fragments and 957 * chain them (using skb as the first fragment) to skb->next. 958 * During transmission, we will remove the successfully transmitted 959 * fragments from this list. When the low-level driver rejects one 960 * of the fragments then we will simply pretend to accept the skb 961 * but store it away as pending. 962 */ 963 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 964 return TX_DROP; 965 966 /* update duration/seq/flags of fragments */ 967 fragnum = 0; 968 969 skb_queue_walk(&tx->skbs, skb) { 970 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 971 972 hdr = (void *)skb->data; 973 info = IEEE80211_SKB_CB(skb); 974 975 if (!skb_queue_is_last(&tx->skbs, skb)) { 976 hdr->frame_control |= morefrags; 977 /* 978 * No multi-rate retries for fragmented frames, that 979 * would completely throw off the NAV at other STAs. 980 */ 981 info->control.rates[1].idx = -1; 982 info->control.rates[2].idx = -1; 983 info->control.rates[3].idx = -1; 984 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 985 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 986 } else { 987 hdr->frame_control &= ~morefrags; 988 } 989 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 990 fragnum++; 991 } 992 993 return TX_CONTINUE; 994 } 995 996 static ieee80211_tx_result debug_noinline 997 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 998 { 999 struct sk_buff *skb; 1000 int ac = -1; 1001 1002 if (!tx->sta) 1003 return TX_CONTINUE; 1004 1005 skb_queue_walk(&tx->skbs, skb) { 1006 ac = skb_get_queue_mapping(skb); 1007 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1008 } 1009 if (ac >= 0) 1010 tx->sta->deflink.tx_stats.packets[ac]++; 1011 1012 return TX_CONTINUE; 1013 } 1014 1015 static ieee80211_tx_result debug_noinline 1016 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1017 { 1018 if (!tx->key) 1019 return TX_CONTINUE; 1020 1021 switch (tx->key->conf.cipher) { 1022 case WLAN_CIPHER_SUITE_WEP40: 1023 case WLAN_CIPHER_SUITE_WEP104: 1024 return ieee80211_crypto_wep_encrypt(tx); 1025 case WLAN_CIPHER_SUITE_TKIP: 1026 return ieee80211_crypto_tkip_encrypt(tx); 1027 case WLAN_CIPHER_SUITE_CCMP: 1028 return ieee80211_crypto_ccmp_encrypt( 1029 tx, IEEE80211_CCMP_MIC_LEN); 1030 case WLAN_CIPHER_SUITE_CCMP_256: 1031 return ieee80211_crypto_ccmp_encrypt( 1032 tx, IEEE80211_CCMP_256_MIC_LEN); 1033 case WLAN_CIPHER_SUITE_AES_CMAC: 1034 return ieee80211_crypto_aes_cmac_encrypt(tx); 1035 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1036 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1038 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1039 return ieee80211_crypto_aes_gmac_encrypt(tx); 1040 case WLAN_CIPHER_SUITE_GCMP: 1041 case WLAN_CIPHER_SUITE_GCMP_256: 1042 return ieee80211_crypto_gcmp_encrypt(tx); 1043 default: 1044 return ieee80211_crypto_hw_encrypt(tx); 1045 } 1046 1047 return TX_DROP; 1048 } 1049 1050 static ieee80211_tx_result debug_noinline 1051 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1052 { 1053 struct sk_buff *skb; 1054 struct ieee80211_hdr *hdr; 1055 int next_len; 1056 bool group_addr; 1057 1058 skb_queue_walk(&tx->skbs, skb) { 1059 hdr = (void *) skb->data; 1060 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1061 break; /* must not overwrite AID */ 1062 if (!skb_queue_is_last(&tx->skbs, skb)) { 1063 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1064 next_len = next->len; 1065 } else 1066 next_len = 0; 1067 group_addr = is_multicast_ether_addr(hdr->addr1); 1068 1069 hdr->duration_id = 1070 ieee80211_duration(tx, skb, group_addr, next_len); 1071 } 1072 1073 return TX_CONTINUE; 1074 } 1075 1076 /* actual transmit path */ 1077 1078 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1079 struct sk_buff *skb, 1080 struct ieee80211_tx_info *info, 1081 struct tid_ampdu_tx *tid_tx, 1082 int tid) 1083 { 1084 bool queued = false; 1085 bool reset_agg_timer = false; 1086 struct sk_buff *purge_skb = NULL; 1087 1088 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1089 info->flags |= IEEE80211_TX_CTL_AMPDU; 1090 reset_agg_timer = true; 1091 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1092 /* 1093 * nothing -- this aggregation session is being started 1094 * but that might still fail with the driver 1095 */ 1096 } else if (!tx->sta->sta.txq[tid]) { 1097 spin_lock(&tx->sta->lock); 1098 /* 1099 * Need to re-check now, because we may get here 1100 * 1101 * 1) in the window during which the setup is actually 1102 * already done, but not marked yet because not all 1103 * packets are spliced over to the driver pending 1104 * queue yet -- if this happened we acquire the lock 1105 * either before or after the splice happens, but 1106 * need to recheck which of these cases happened. 1107 * 1108 * 2) during session teardown, if the OPERATIONAL bit 1109 * was cleared due to the teardown but the pointer 1110 * hasn't been assigned NULL yet (or we loaded it 1111 * before it was assigned) -- in this case it may 1112 * now be NULL which means we should just let the 1113 * packet pass through because splicing the frames 1114 * back is already done. 1115 */ 1116 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1117 1118 if (!tid_tx) { 1119 /* do nothing, let packet pass through */ 1120 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1121 info->flags |= IEEE80211_TX_CTL_AMPDU; 1122 reset_agg_timer = true; 1123 } else { 1124 queued = true; 1125 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1126 clear_sta_flag(tx->sta, WLAN_STA_SP); 1127 ps_dbg(tx->sta->sdata, 1128 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1129 tx->sta->sta.addr, tx->sta->sta.aid); 1130 } 1131 info->control.vif = &tx->sdata->vif; 1132 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1133 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1134 __skb_queue_tail(&tid_tx->pending, skb); 1135 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1136 purge_skb = __skb_dequeue(&tid_tx->pending); 1137 } 1138 spin_unlock(&tx->sta->lock); 1139 1140 if (purge_skb) 1141 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1142 } 1143 1144 /* reset session timer */ 1145 if (reset_agg_timer) 1146 tid_tx->last_tx = jiffies; 1147 1148 return queued; 1149 } 1150 1151 static void 1152 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1153 struct sta_info *sta, 1154 struct sk_buff *skb) 1155 { 1156 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1157 u16 tid; 1158 1159 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1160 return; 1161 1162 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1163 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1164 skb->protocol == sdata->control_port_protocol) 1165 return; 1166 1167 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1168 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1169 return; 1170 1171 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1172 } 1173 1174 /* 1175 * initialises @tx 1176 * pass %NULL for the station if unknown, a valid pointer if known 1177 * or an ERR_PTR() if the station is known not to exist 1178 */ 1179 static ieee80211_tx_result 1180 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1181 struct ieee80211_tx_data *tx, 1182 struct sta_info *sta, struct sk_buff *skb) 1183 { 1184 struct ieee80211_local *local = sdata->local; 1185 struct ieee80211_hdr *hdr; 1186 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1187 bool aggr_check = false; 1188 int tid; 1189 1190 memset(tx, 0, sizeof(*tx)); 1191 tx->skb = skb; 1192 tx->local = local; 1193 tx->sdata = sdata; 1194 __skb_queue_head_init(&tx->skbs); 1195 1196 /* 1197 * If this flag is set to true anywhere, and we get here, 1198 * we are doing the needed processing, so remove the flag 1199 * now. 1200 */ 1201 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1202 1203 hdr = (struct ieee80211_hdr *) skb->data; 1204 1205 if (likely(sta)) { 1206 if (!IS_ERR(sta)) 1207 tx->sta = sta; 1208 } else { 1209 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1210 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1211 if (!tx->sta && sdata->wdev.use_4addr) 1212 return TX_DROP; 1213 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1214 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1215 } 1216 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1217 tx->sta = sta_info_get(sdata, hdr->addr1); 1218 aggr_check = true; 1219 } 1220 } 1221 1222 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1223 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1224 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1225 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1226 struct tid_ampdu_tx *tid_tx; 1227 1228 tid = ieee80211_get_tid(hdr); 1229 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1230 if (!tid_tx && aggr_check) { 1231 ieee80211_aggr_check(sdata, tx->sta, skb); 1232 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1233 } 1234 1235 if (tid_tx) { 1236 bool queued; 1237 1238 queued = ieee80211_tx_prep_agg(tx, skb, info, 1239 tid_tx, tid); 1240 1241 if (unlikely(queued)) 1242 return TX_QUEUED; 1243 } 1244 } 1245 1246 if (is_multicast_ether_addr(hdr->addr1)) { 1247 tx->flags &= ~IEEE80211_TX_UNICAST; 1248 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1249 } else 1250 tx->flags |= IEEE80211_TX_UNICAST; 1251 1252 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1253 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1254 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1255 info->flags & IEEE80211_TX_CTL_AMPDU) 1256 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1257 } 1258 1259 if (!tx->sta) 1260 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1261 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1262 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1263 ieee80211_check_fast_xmit(tx->sta); 1264 } 1265 1266 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1267 1268 return TX_CONTINUE; 1269 } 1270 1271 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1272 struct ieee80211_vif *vif, 1273 struct sta_info *sta, 1274 struct sk_buff *skb) 1275 { 1276 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1277 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1278 struct ieee80211_txq *txq = NULL; 1279 1280 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1281 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1282 return NULL; 1283 1284 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1285 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1286 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1287 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1288 vif->type == NL80211_IFTYPE_STATION) && 1289 sta && sta->uploaded) { 1290 /* 1291 * This will be NULL if the driver didn't set the 1292 * opt-in hardware flag. 1293 */ 1294 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1295 } 1296 } else if (sta) { 1297 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1298 1299 if (!sta->uploaded) 1300 return NULL; 1301 1302 txq = sta->sta.txq[tid]; 1303 } else if (vif) { 1304 txq = vif->txq; 1305 } 1306 1307 if (!txq) 1308 return NULL; 1309 1310 return to_txq_info(txq); 1311 } 1312 1313 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1314 { 1315 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1316 } 1317 1318 static u32 codel_skb_len_func(const struct sk_buff *skb) 1319 { 1320 return skb->len; 1321 } 1322 1323 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1324 { 1325 const struct ieee80211_tx_info *info; 1326 1327 info = (const struct ieee80211_tx_info *)skb->cb; 1328 return info->control.enqueue_time; 1329 } 1330 1331 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1332 void *ctx) 1333 { 1334 struct ieee80211_local *local; 1335 struct txq_info *txqi; 1336 struct fq *fq; 1337 struct fq_flow *flow; 1338 1339 txqi = ctx; 1340 local = vif_to_sdata(txqi->txq.vif)->local; 1341 fq = &local->fq; 1342 1343 if (cvars == &txqi->def_cvars) 1344 flow = &txqi->tin.default_flow; 1345 else 1346 flow = &fq->flows[cvars - local->cvars]; 1347 1348 return fq_flow_dequeue(fq, flow); 1349 } 1350 1351 static void codel_drop_func(struct sk_buff *skb, 1352 void *ctx) 1353 { 1354 struct ieee80211_local *local; 1355 struct ieee80211_hw *hw; 1356 struct txq_info *txqi; 1357 1358 txqi = ctx; 1359 local = vif_to_sdata(txqi->txq.vif)->local; 1360 hw = &local->hw; 1361 1362 ieee80211_free_txskb(hw, skb); 1363 } 1364 1365 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1366 struct fq_tin *tin, 1367 struct fq_flow *flow) 1368 { 1369 struct ieee80211_local *local; 1370 struct txq_info *txqi; 1371 struct codel_vars *cvars; 1372 struct codel_params *cparams; 1373 struct codel_stats *cstats; 1374 1375 local = container_of(fq, struct ieee80211_local, fq); 1376 txqi = container_of(tin, struct txq_info, tin); 1377 cstats = &txqi->cstats; 1378 1379 if (txqi->txq.sta) { 1380 struct sta_info *sta = container_of(txqi->txq.sta, 1381 struct sta_info, sta); 1382 cparams = &sta->cparams; 1383 } else { 1384 cparams = &local->cparams; 1385 } 1386 1387 if (flow == &tin->default_flow) 1388 cvars = &txqi->def_cvars; 1389 else 1390 cvars = &local->cvars[flow - fq->flows]; 1391 1392 return codel_dequeue(txqi, 1393 &flow->backlog, 1394 cparams, 1395 cvars, 1396 cstats, 1397 codel_skb_len_func, 1398 codel_skb_time_func, 1399 codel_drop_func, 1400 codel_dequeue_func); 1401 } 1402 1403 static void fq_skb_free_func(struct fq *fq, 1404 struct fq_tin *tin, 1405 struct fq_flow *flow, 1406 struct sk_buff *skb) 1407 { 1408 struct ieee80211_local *local; 1409 1410 local = container_of(fq, struct ieee80211_local, fq); 1411 ieee80211_free_txskb(&local->hw, skb); 1412 } 1413 1414 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1415 struct txq_info *txqi, 1416 struct sk_buff *skb) 1417 { 1418 struct fq *fq = &local->fq; 1419 struct fq_tin *tin = &txqi->tin; 1420 u32 flow_idx = fq_flow_idx(fq, skb); 1421 1422 ieee80211_set_skb_enqueue_time(skb); 1423 1424 spin_lock_bh(&fq->lock); 1425 /* 1426 * For management frames, don't really apply codel etc., 1427 * we don't want to apply any shaping or anything we just 1428 * want to simplify the driver API by having them on the 1429 * txqi. 1430 */ 1431 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1432 IEEE80211_SKB_CB(skb)->control.flags |= 1433 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1434 __skb_queue_tail(&txqi->frags, skb); 1435 } else { 1436 fq_tin_enqueue(fq, tin, flow_idx, skb, 1437 fq_skb_free_func); 1438 } 1439 spin_unlock_bh(&fq->lock); 1440 } 1441 1442 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1443 struct fq_flow *flow, struct sk_buff *skb, 1444 void *data) 1445 { 1446 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1447 1448 return info->control.vif == data; 1449 } 1450 1451 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1452 struct ieee80211_sub_if_data *sdata) 1453 { 1454 struct fq *fq = &local->fq; 1455 struct txq_info *txqi; 1456 struct fq_tin *tin; 1457 struct ieee80211_sub_if_data *ap; 1458 1459 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1460 return; 1461 1462 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1463 1464 if (!ap->vif.txq) 1465 return; 1466 1467 txqi = to_txq_info(ap->vif.txq); 1468 tin = &txqi->tin; 1469 1470 spin_lock_bh(&fq->lock); 1471 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1472 fq_skb_free_func); 1473 spin_unlock_bh(&fq->lock); 1474 } 1475 1476 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1477 struct sta_info *sta, 1478 struct txq_info *txqi, int tid) 1479 { 1480 fq_tin_init(&txqi->tin); 1481 codel_vars_init(&txqi->def_cvars); 1482 codel_stats_init(&txqi->cstats); 1483 __skb_queue_head_init(&txqi->frags); 1484 RB_CLEAR_NODE(&txqi->schedule_order); 1485 1486 txqi->txq.vif = &sdata->vif; 1487 1488 if (!sta) { 1489 sdata->vif.txq = &txqi->txq; 1490 txqi->txq.tid = 0; 1491 txqi->txq.ac = IEEE80211_AC_BE; 1492 1493 return; 1494 } 1495 1496 if (tid == IEEE80211_NUM_TIDS) { 1497 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1498 /* Drivers need to opt in to the management MPDU TXQ */ 1499 if (!ieee80211_hw_check(&sdata->local->hw, 1500 STA_MMPDU_TXQ)) 1501 return; 1502 } else if (!ieee80211_hw_check(&sdata->local->hw, 1503 BUFF_MMPDU_TXQ)) { 1504 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1505 return; 1506 } 1507 txqi->txq.ac = IEEE80211_AC_VO; 1508 } else { 1509 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1510 } 1511 1512 txqi->txq.sta = &sta->sta; 1513 txqi->txq.tid = tid; 1514 sta->sta.txq[tid] = &txqi->txq; 1515 } 1516 1517 void ieee80211_txq_purge(struct ieee80211_local *local, 1518 struct txq_info *txqi) 1519 { 1520 struct fq *fq = &local->fq; 1521 struct fq_tin *tin = &txqi->tin; 1522 1523 spin_lock_bh(&fq->lock); 1524 fq_tin_reset(fq, tin, fq_skb_free_func); 1525 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1526 spin_unlock_bh(&fq->lock); 1527 1528 ieee80211_unschedule_txq(&local->hw, &txqi->txq, true); 1529 } 1530 1531 void ieee80211_txq_set_params(struct ieee80211_local *local) 1532 { 1533 if (local->hw.wiphy->txq_limit) 1534 local->fq.limit = local->hw.wiphy->txq_limit; 1535 else 1536 local->hw.wiphy->txq_limit = local->fq.limit; 1537 1538 if (local->hw.wiphy->txq_memory_limit) 1539 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1540 else 1541 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1542 1543 if (local->hw.wiphy->txq_quantum) 1544 local->fq.quantum = local->hw.wiphy->txq_quantum; 1545 else 1546 local->hw.wiphy->txq_quantum = local->fq.quantum; 1547 } 1548 1549 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1550 { 1551 struct fq *fq = &local->fq; 1552 int ret; 1553 int i; 1554 bool supp_vht = false; 1555 enum nl80211_band band; 1556 1557 if (!local->ops->wake_tx_queue) 1558 return 0; 1559 1560 ret = fq_init(fq, 4096); 1561 if (ret) 1562 return ret; 1563 1564 /* 1565 * If the hardware doesn't support VHT, it is safe to limit the maximum 1566 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1567 */ 1568 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1569 struct ieee80211_supported_band *sband; 1570 1571 sband = local->hw.wiphy->bands[band]; 1572 if (!sband) 1573 continue; 1574 1575 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1576 } 1577 1578 if (!supp_vht) 1579 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1580 1581 codel_params_init(&local->cparams); 1582 local->cparams.interval = MS2TIME(100); 1583 local->cparams.target = MS2TIME(20); 1584 local->cparams.ecn = true; 1585 1586 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1587 GFP_KERNEL); 1588 if (!local->cvars) { 1589 spin_lock_bh(&fq->lock); 1590 fq_reset(fq, fq_skb_free_func); 1591 spin_unlock_bh(&fq->lock); 1592 return -ENOMEM; 1593 } 1594 1595 for (i = 0; i < fq->flows_cnt; i++) 1596 codel_vars_init(&local->cvars[i]); 1597 1598 ieee80211_txq_set_params(local); 1599 1600 return 0; 1601 } 1602 1603 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1604 { 1605 struct fq *fq = &local->fq; 1606 1607 if (!local->ops->wake_tx_queue) 1608 return; 1609 1610 kfree(local->cvars); 1611 local->cvars = NULL; 1612 1613 spin_lock_bh(&fq->lock); 1614 fq_reset(fq, fq_skb_free_func); 1615 spin_unlock_bh(&fq->lock); 1616 } 1617 1618 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1619 struct ieee80211_sub_if_data *sdata, 1620 struct sta_info *sta, 1621 struct sk_buff *skb) 1622 { 1623 struct ieee80211_vif *vif; 1624 struct txq_info *txqi; 1625 1626 if (!local->ops->wake_tx_queue || 1627 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1628 return false; 1629 1630 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1631 sdata = container_of(sdata->bss, 1632 struct ieee80211_sub_if_data, u.ap); 1633 1634 vif = &sdata->vif; 1635 txqi = ieee80211_get_txq(local, vif, sta, skb); 1636 1637 if (!txqi) 1638 return false; 1639 1640 ieee80211_txq_enqueue(local, txqi, skb); 1641 1642 schedule_and_wake_txq(local, txqi); 1643 1644 return true; 1645 } 1646 1647 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1648 struct ieee80211_vif *vif, 1649 struct sta_info *sta, 1650 struct sk_buff_head *skbs, 1651 bool txpending) 1652 { 1653 struct ieee80211_tx_control control = {}; 1654 struct sk_buff *skb, *tmp; 1655 unsigned long flags; 1656 1657 skb_queue_walk_safe(skbs, skb, tmp) { 1658 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1659 int q = info->hw_queue; 1660 1661 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1662 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1663 __skb_unlink(skb, skbs); 1664 ieee80211_free_txskb(&local->hw, skb); 1665 continue; 1666 } 1667 #endif 1668 1669 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1670 if (local->queue_stop_reasons[q] || 1671 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1672 if (unlikely(info->flags & 1673 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1674 if (local->queue_stop_reasons[q] & 1675 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1676 /* 1677 * Drop off-channel frames if queues 1678 * are stopped for any reason other 1679 * than off-channel operation. Never 1680 * queue them. 1681 */ 1682 spin_unlock_irqrestore( 1683 &local->queue_stop_reason_lock, 1684 flags); 1685 ieee80211_purge_tx_queue(&local->hw, 1686 skbs); 1687 return true; 1688 } 1689 } else { 1690 1691 /* 1692 * Since queue is stopped, queue up frames for 1693 * later transmission from the tx-pending 1694 * tasklet when the queue is woken again. 1695 */ 1696 if (txpending) 1697 skb_queue_splice_init(skbs, 1698 &local->pending[q]); 1699 else 1700 skb_queue_splice_tail_init(skbs, 1701 &local->pending[q]); 1702 1703 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1704 flags); 1705 return false; 1706 } 1707 } 1708 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1709 1710 info->control.vif = vif; 1711 control.sta = sta ? &sta->sta : NULL; 1712 1713 __skb_unlink(skb, skbs); 1714 drv_tx(local, &control, skb); 1715 } 1716 1717 return true; 1718 } 1719 1720 /* 1721 * Returns false if the frame couldn't be transmitted but was queued instead. 1722 */ 1723 static bool __ieee80211_tx(struct ieee80211_local *local, 1724 struct sk_buff_head *skbs, struct sta_info *sta, 1725 bool txpending) 1726 { 1727 struct ieee80211_tx_info *info; 1728 struct ieee80211_sub_if_data *sdata; 1729 struct ieee80211_vif *vif; 1730 struct sk_buff *skb; 1731 bool result; 1732 1733 if (WARN_ON(skb_queue_empty(skbs))) 1734 return true; 1735 1736 skb = skb_peek(skbs); 1737 info = IEEE80211_SKB_CB(skb); 1738 sdata = vif_to_sdata(info->control.vif); 1739 if (sta && !sta->uploaded) 1740 sta = NULL; 1741 1742 switch (sdata->vif.type) { 1743 case NL80211_IFTYPE_MONITOR: 1744 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1745 vif = &sdata->vif; 1746 break; 1747 } 1748 sdata = rcu_dereference(local->monitor_sdata); 1749 if (sdata) { 1750 vif = &sdata->vif; 1751 info->hw_queue = 1752 vif->hw_queue[skb_get_queue_mapping(skb)]; 1753 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1754 ieee80211_purge_tx_queue(&local->hw, skbs); 1755 return true; 1756 } else 1757 vif = NULL; 1758 break; 1759 case NL80211_IFTYPE_AP_VLAN: 1760 sdata = container_of(sdata->bss, 1761 struct ieee80211_sub_if_data, u.ap); 1762 fallthrough; 1763 default: 1764 vif = &sdata->vif; 1765 break; 1766 } 1767 1768 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1769 1770 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1771 1772 return result; 1773 } 1774 1775 /* 1776 * Invoke TX handlers, return 0 on success and non-zero if the 1777 * frame was dropped or queued. 1778 * 1779 * The handlers are split into an early and late part. The latter is everything 1780 * that can be sensitive to reordering, and will be deferred to after packets 1781 * are dequeued from the intermediate queues (when they are enabled). 1782 */ 1783 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1784 { 1785 ieee80211_tx_result res = TX_DROP; 1786 1787 #define CALL_TXH(txh) \ 1788 do { \ 1789 res = txh(tx); \ 1790 if (res != TX_CONTINUE) \ 1791 goto txh_done; \ 1792 } while (0) 1793 1794 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1795 CALL_TXH(ieee80211_tx_h_check_assoc); 1796 CALL_TXH(ieee80211_tx_h_ps_buf); 1797 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1798 CALL_TXH(ieee80211_tx_h_select_key); 1799 1800 txh_done: 1801 if (unlikely(res == TX_DROP)) { 1802 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1803 if (tx->skb) 1804 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1805 else 1806 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1807 return -1; 1808 } else if (unlikely(res == TX_QUEUED)) { 1809 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1810 return -1; 1811 } 1812 1813 return 0; 1814 } 1815 1816 /* 1817 * Late handlers can be called while the sta lock is held. Handlers that can 1818 * cause packets to be generated will cause deadlock! 1819 */ 1820 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1821 { 1822 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1823 ieee80211_tx_result res = TX_CONTINUE; 1824 1825 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1826 CALL_TXH(ieee80211_tx_h_rate_ctrl); 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 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1835 CALL_TXH(ieee80211_tx_h_sequence); 1836 CALL_TXH(ieee80211_tx_h_fragment); 1837 /* handlers after fragment must be aware of tx info fragmentation! */ 1838 CALL_TXH(ieee80211_tx_h_stats); 1839 CALL_TXH(ieee80211_tx_h_encrypt); 1840 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1841 CALL_TXH(ieee80211_tx_h_calculate_duration); 1842 #undef CALL_TXH 1843 1844 txh_done: 1845 if (unlikely(res == TX_DROP)) { 1846 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1847 if (tx->skb) 1848 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1849 else 1850 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1851 return -1; 1852 } else if (unlikely(res == TX_QUEUED)) { 1853 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1854 return -1; 1855 } 1856 1857 return 0; 1858 } 1859 1860 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1861 { 1862 int r = invoke_tx_handlers_early(tx); 1863 1864 if (r) 1865 return r; 1866 return invoke_tx_handlers_late(tx); 1867 } 1868 1869 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1870 struct ieee80211_vif *vif, struct sk_buff *skb, 1871 int band, struct ieee80211_sta **sta) 1872 { 1873 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1874 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1875 struct ieee80211_tx_data tx; 1876 struct sk_buff *skb2; 1877 1878 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1879 return false; 1880 1881 info->band = band; 1882 info->control.vif = vif; 1883 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1884 1885 if (invoke_tx_handlers(&tx)) 1886 return false; 1887 1888 if (sta) { 1889 if (tx.sta) 1890 *sta = &tx.sta->sta; 1891 else 1892 *sta = NULL; 1893 } 1894 1895 /* this function isn't suitable for fragmented data frames */ 1896 skb2 = __skb_dequeue(&tx.skbs); 1897 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1898 ieee80211_free_txskb(hw, skb2); 1899 ieee80211_purge_tx_queue(hw, &tx.skbs); 1900 return false; 1901 } 1902 1903 return true; 1904 } 1905 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1906 1907 /* 1908 * Returns false if the frame couldn't be transmitted but was queued instead. 1909 */ 1910 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1911 struct sta_info *sta, struct sk_buff *skb, 1912 bool txpending) 1913 { 1914 struct ieee80211_local *local = sdata->local; 1915 struct ieee80211_tx_data tx; 1916 ieee80211_tx_result res_prepare; 1917 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1918 bool result = true; 1919 1920 if (unlikely(skb->len < 10)) { 1921 dev_kfree_skb(skb); 1922 return true; 1923 } 1924 1925 /* initialises tx */ 1926 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1927 1928 if (unlikely(res_prepare == TX_DROP)) { 1929 ieee80211_free_txskb(&local->hw, skb); 1930 return true; 1931 } else if (unlikely(res_prepare == TX_QUEUED)) { 1932 return true; 1933 } 1934 1935 /* set up hw_queue value early */ 1936 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1937 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1938 info->hw_queue = 1939 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1940 1941 if (invoke_tx_handlers_early(&tx)) 1942 return true; 1943 1944 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1945 return true; 1946 1947 if (!invoke_tx_handlers_late(&tx)) 1948 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1949 1950 return result; 1951 } 1952 1953 /* device xmit handlers */ 1954 1955 enum ieee80211_encrypt { 1956 ENCRYPT_NO, 1957 ENCRYPT_MGMT, 1958 ENCRYPT_DATA, 1959 }; 1960 1961 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1962 struct sk_buff *skb, 1963 int head_need, 1964 enum ieee80211_encrypt encrypt) 1965 { 1966 struct ieee80211_local *local = sdata->local; 1967 bool enc_tailroom; 1968 int tail_need = 0; 1969 1970 enc_tailroom = encrypt == ENCRYPT_MGMT || 1971 (encrypt == ENCRYPT_DATA && 1972 sdata->crypto_tx_tailroom_needed_cnt); 1973 1974 if (enc_tailroom) { 1975 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1976 tail_need -= skb_tailroom(skb); 1977 tail_need = max_t(int, tail_need, 0); 1978 } 1979 1980 if (skb_cloned(skb) && 1981 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1982 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1983 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1984 else if (head_need || tail_need) 1985 I802_DEBUG_INC(local->tx_expand_skb_head); 1986 else 1987 return 0; 1988 1989 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1990 wiphy_debug(local->hw.wiphy, 1991 "failed to reallocate TX buffer\n"); 1992 return -ENOMEM; 1993 } 1994 1995 return 0; 1996 } 1997 1998 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1999 struct sta_info *sta, struct sk_buff *skb) 2000 { 2001 struct ieee80211_local *local = sdata->local; 2002 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2003 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2004 int headroom; 2005 enum ieee80211_encrypt encrypt; 2006 2007 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2008 encrypt = ENCRYPT_NO; 2009 else if (ieee80211_is_mgmt(hdr->frame_control)) 2010 encrypt = ENCRYPT_MGMT; 2011 else 2012 encrypt = ENCRYPT_DATA; 2013 2014 headroom = local->tx_headroom; 2015 if (encrypt != ENCRYPT_NO) 2016 headroom += sdata->encrypt_headroom; 2017 headroom -= skb_headroom(skb); 2018 headroom = max_t(int, 0, headroom); 2019 2020 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2021 ieee80211_free_txskb(&local->hw, skb); 2022 return; 2023 } 2024 2025 /* reload after potential resize */ 2026 hdr = (struct ieee80211_hdr *) skb->data; 2027 info->control.vif = &sdata->vif; 2028 2029 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2030 if (ieee80211_is_data(hdr->frame_control) && 2031 is_unicast_ether_addr(hdr->addr1)) { 2032 if (mesh_nexthop_resolve(sdata, skb)) 2033 return; /* skb queued: don't free */ 2034 } else { 2035 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2036 } 2037 } 2038 2039 ieee80211_set_qos_hdr(sdata, skb); 2040 ieee80211_tx(sdata, sta, skb, false); 2041 } 2042 2043 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2044 { 2045 struct ieee80211_radiotap_header *rthdr = 2046 (struct ieee80211_radiotap_header *)skb->data; 2047 2048 /* check for not even having the fixed radiotap header part */ 2049 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2050 return false; /* too short to be possibly valid */ 2051 2052 /* is it a header version we can trust to find length from? */ 2053 if (unlikely(rthdr->it_version)) 2054 return false; /* only version 0 is supported */ 2055 2056 /* does the skb contain enough to deliver on the alleged length? */ 2057 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2058 return false; /* skb too short for claimed rt header extent */ 2059 2060 return true; 2061 } 2062 2063 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2064 struct net_device *dev) 2065 { 2066 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2067 struct ieee80211_radiotap_iterator iterator; 2068 struct ieee80211_radiotap_header *rthdr = 2069 (struct ieee80211_radiotap_header *) skb->data; 2070 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2071 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2072 NULL); 2073 u16 txflags; 2074 u16 rate = 0; 2075 bool rate_found = false; 2076 u8 rate_retries = 0; 2077 u16 rate_flags = 0; 2078 u8 mcs_known, mcs_flags, mcs_bw; 2079 u16 vht_known; 2080 u8 vht_mcs = 0, vht_nss = 0; 2081 int i; 2082 2083 if (!ieee80211_validate_radiotap_len(skb)) 2084 return false; 2085 2086 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2087 IEEE80211_TX_CTL_DONTFRAG; 2088 2089 /* 2090 * for every radiotap entry that is present 2091 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2092 * entries present, or -EINVAL on error) 2093 */ 2094 2095 while (!ret) { 2096 ret = ieee80211_radiotap_iterator_next(&iterator); 2097 2098 if (ret) 2099 continue; 2100 2101 /* see if this argument is something we can use */ 2102 switch (iterator.this_arg_index) { 2103 /* 2104 * You must take care when dereferencing iterator.this_arg 2105 * for multibyte types... the pointer is not aligned. Use 2106 * get_unaligned((type *)iterator.this_arg) to dereference 2107 * iterator.this_arg for type "type" safely on all arches. 2108 */ 2109 case IEEE80211_RADIOTAP_FLAGS: 2110 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2111 /* 2112 * this indicates that the skb we have been 2113 * handed has the 32-bit FCS CRC at the end... 2114 * we should react to that by snipping it off 2115 * because it will be recomputed and added 2116 * on transmission 2117 */ 2118 if (skb->len < (iterator._max_length + FCS_LEN)) 2119 return false; 2120 2121 skb_trim(skb, skb->len - FCS_LEN); 2122 } 2123 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2124 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2125 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2126 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2127 break; 2128 2129 case IEEE80211_RADIOTAP_TX_FLAGS: 2130 txflags = get_unaligned_le16(iterator.this_arg); 2131 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2132 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2133 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2134 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2135 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2136 info->control.flags |= 2137 IEEE80211_TX_CTRL_DONT_REORDER; 2138 break; 2139 2140 case IEEE80211_RADIOTAP_RATE: 2141 rate = *iterator.this_arg; 2142 rate_flags = 0; 2143 rate_found = true; 2144 break; 2145 2146 case IEEE80211_RADIOTAP_DATA_RETRIES: 2147 rate_retries = *iterator.this_arg; 2148 break; 2149 2150 case IEEE80211_RADIOTAP_MCS: 2151 mcs_known = iterator.this_arg[0]; 2152 mcs_flags = iterator.this_arg[1]; 2153 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2154 break; 2155 2156 rate_found = true; 2157 rate = iterator.this_arg[2]; 2158 rate_flags = IEEE80211_TX_RC_MCS; 2159 2160 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2161 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2162 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2163 2164 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2165 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2166 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2167 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2168 2169 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2170 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2171 info->flags |= IEEE80211_TX_CTL_LDPC; 2172 2173 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2174 u8 stbc = u8_get_bits(mcs_flags, 2175 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2176 2177 info->flags |= 2178 u32_encode_bits(stbc, 2179 IEEE80211_TX_CTL_STBC); 2180 } 2181 break; 2182 2183 case IEEE80211_RADIOTAP_VHT: 2184 vht_known = get_unaligned_le16(iterator.this_arg); 2185 rate_found = true; 2186 2187 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2188 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2189 (iterator.this_arg[2] & 2190 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2191 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2192 if (vht_known & 2193 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2194 if (iterator.this_arg[3] == 1) 2195 rate_flags |= 2196 IEEE80211_TX_RC_40_MHZ_WIDTH; 2197 else if (iterator.this_arg[3] == 4) 2198 rate_flags |= 2199 IEEE80211_TX_RC_80_MHZ_WIDTH; 2200 else if (iterator.this_arg[3] == 11) 2201 rate_flags |= 2202 IEEE80211_TX_RC_160_MHZ_WIDTH; 2203 } 2204 2205 vht_mcs = iterator.this_arg[4] >> 4; 2206 if (vht_mcs > 11) 2207 vht_mcs = 0; 2208 vht_nss = iterator.this_arg[4] & 0xF; 2209 if (!vht_nss || vht_nss > 8) 2210 vht_nss = 1; 2211 break; 2212 2213 /* 2214 * Please update the file 2215 * Documentation/networking/mac80211-injection.rst 2216 * when parsing new fields here. 2217 */ 2218 2219 default: 2220 break; 2221 } 2222 } 2223 2224 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2225 return false; 2226 2227 if (rate_found) { 2228 struct ieee80211_supported_band *sband = 2229 local->hw.wiphy->bands[info->band]; 2230 2231 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2232 2233 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2234 info->control.rates[i].idx = -1; 2235 info->control.rates[i].flags = 0; 2236 info->control.rates[i].count = 0; 2237 } 2238 2239 if (rate_flags & IEEE80211_TX_RC_MCS) { 2240 info->control.rates[0].idx = rate; 2241 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2242 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2243 vht_nss); 2244 } else if (sband) { 2245 for (i = 0; i < sband->n_bitrates; i++) { 2246 if (rate * 5 != sband->bitrates[i].bitrate) 2247 continue; 2248 2249 info->control.rates[0].idx = i; 2250 break; 2251 } 2252 } 2253 2254 if (info->control.rates[0].idx < 0) 2255 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2256 2257 info->control.rates[0].flags = rate_flags; 2258 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2259 local->hw.max_rate_tries); 2260 } 2261 2262 return true; 2263 } 2264 2265 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2266 struct net_device *dev) 2267 { 2268 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2269 struct ieee80211_chanctx_conf *chanctx_conf; 2270 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2271 struct ieee80211_hdr *hdr; 2272 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2273 struct cfg80211_chan_def *chandef; 2274 u16 len_rthdr; 2275 int hdrlen; 2276 2277 memset(info, 0, sizeof(*info)); 2278 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2279 IEEE80211_TX_CTL_INJECTED; 2280 2281 /* Sanity-check the length of the radiotap header */ 2282 if (!ieee80211_validate_radiotap_len(skb)) 2283 goto fail; 2284 2285 /* we now know there is a radiotap header with a length we can use */ 2286 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2287 2288 /* 2289 * fix up the pointers accounting for the radiotap 2290 * header still being in there. We are being given 2291 * a precooked IEEE80211 header so no need for 2292 * normal processing 2293 */ 2294 skb_set_mac_header(skb, len_rthdr); 2295 /* 2296 * these are just fixed to the end of the rt area since we 2297 * don't have any better information and at this point, nobody cares 2298 */ 2299 skb_set_network_header(skb, len_rthdr); 2300 skb_set_transport_header(skb, len_rthdr); 2301 2302 if (skb->len < len_rthdr + 2) 2303 goto fail; 2304 2305 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2306 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2307 2308 if (skb->len < len_rthdr + hdrlen) 2309 goto fail; 2310 2311 /* 2312 * Initialize skb->protocol if the injected frame is a data frame 2313 * carrying a rfc1042 header 2314 */ 2315 if (ieee80211_is_data(hdr->frame_control) && 2316 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2317 u8 *payload = (u8 *)hdr + hdrlen; 2318 2319 if (ether_addr_equal(payload, rfc1042_header)) 2320 skb->protocol = cpu_to_be16((payload[6] << 8) | 2321 payload[7]); 2322 } 2323 2324 rcu_read_lock(); 2325 2326 /* 2327 * We process outgoing injected frames that have a local address 2328 * we handle as though they are non-injected frames. 2329 * This code here isn't entirely correct, the local MAC address 2330 * isn't always enough to find the interface to use; for proper 2331 * VLAN support we have an nl80211-based mechanism. 2332 * 2333 * This is necessary, for example, for old hostapd versions that 2334 * don't use nl80211-based management TX/RX. 2335 */ 2336 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2337 2338 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2339 if (!ieee80211_sdata_running(tmp_sdata)) 2340 continue; 2341 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2342 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2343 continue; 2344 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2345 sdata = tmp_sdata; 2346 break; 2347 } 2348 } 2349 2350 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2351 if (!chanctx_conf) { 2352 tmp_sdata = rcu_dereference(local->monitor_sdata); 2353 if (tmp_sdata) 2354 chanctx_conf = 2355 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2356 } 2357 2358 if (chanctx_conf) 2359 chandef = &chanctx_conf->def; 2360 else if (!local->use_chanctx) 2361 chandef = &local->_oper_chandef; 2362 else 2363 goto fail_rcu; 2364 2365 /* 2366 * Frame injection is not allowed if beaconing is not allowed 2367 * or if we need radar detection. Beaconing is usually not allowed when 2368 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2369 * Passive scan is also used in world regulatory domains where 2370 * your country is not known and as such it should be treated as 2371 * NO TX unless the channel is explicitly allowed in which case 2372 * your current regulatory domain would not have the passive scan 2373 * flag. 2374 * 2375 * Since AP mode uses monitor interfaces to inject/TX management 2376 * frames we can make AP mode the exception to this rule once it 2377 * supports radar detection as its implementation can deal with 2378 * radar detection by itself. We can do that later by adding a 2379 * monitor flag interfaces used for AP support. 2380 */ 2381 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2382 sdata->vif.type)) 2383 goto fail_rcu; 2384 2385 info->band = chandef->chan->band; 2386 2387 /* Initialize skb->priority according to frame type and TID class, 2388 * with respect to the sub interface that the frame will actually 2389 * be transmitted on. If the DONT_REORDER flag is set, the original 2390 * skb-priority is preserved to assure frames injected with this 2391 * flag are not reordered relative to each other. 2392 */ 2393 ieee80211_select_queue_80211(sdata, skb, hdr); 2394 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2395 2396 /* 2397 * Process the radiotap header. This will now take into account the 2398 * selected chandef above to accurately set injection rates and 2399 * retransmissions. 2400 */ 2401 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2402 goto fail_rcu; 2403 2404 /* remove the injection radiotap header */ 2405 skb_pull(skb, len_rthdr); 2406 2407 ieee80211_xmit(sdata, NULL, skb); 2408 rcu_read_unlock(); 2409 2410 return NETDEV_TX_OK; 2411 2412 fail_rcu: 2413 rcu_read_unlock(); 2414 fail: 2415 dev_kfree_skb(skb); 2416 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2417 } 2418 2419 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2420 { 2421 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2422 2423 return ethertype == ETH_P_TDLS && 2424 skb->len > 14 && 2425 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2426 } 2427 2428 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2429 struct sk_buff *skb, 2430 struct sta_info **sta_out) 2431 { 2432 struct sta_info *sta; 2433 2434 switch (sdata->vif.type) { 2435 case NL80211_IFTYPE_AP_VLAN: 2436 sta = rcu_dereference(sdata->u.vlan.sta); 2437 if (sta) { 2438 *sta_out = sta; 2439 return 0; 2440 } else if (sdata->wdev.use_4addr) { 2441 return -ENOLINK; 2442 } 2443 fallthrough; 2444 case NL80211_IFTYPE_AP: 2445 case NL80211_IFTYPE_OCB: 2446 case NL80211_IFTYPE_ADHOC: 2447 if (is_multicast_ether_addr(skb->data)) { 2448 *sta_out = ERR_PTR(-ENOENT); 2449 return 0; 2450 } 2451 sta = sta_info_get_bss(sdata, skb->data); 2452 break; 2453 #ifdef CONFIG_MAC80211_MESH 2454 case NL80211_IFTYPE_MESH_POINT: 2455 /* determined much later */ 2456 *sta_out = NULL; 2457 return 0; 2458 #endif 2459 case NL80211_IFTYPE_STATION: 2460 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2461 sta = sta_info_get(sdata, skb->data); 2462 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2463 if (test_sta_flag(sta, 2464 WLAN_STA_TDLS_PEER_AUTH)) { 2465 *sta_out = sta; 2466 return 0; 2467 } 2468 2469 /* 2470 * TDLS link during setup - throw out frames to 2471 * peer. Allow TDLS-setup frames to unauthorized 2472 * peers for the special case of a link teardown 2473 * after a TDLS sta is removed due to being 2474 * unreachable. 2475 */ 2476 if (!ieee80211_is_tdls_setup(skb)) 2477 return -EINVAL; 2478 } 2479 2480 } 2481 2482 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2483 if (!sta) 2484 return -ENOLINK; 2485 break; 2486 default: 2487 return -EINVAL; 2488 } 2489 2490 *sta_out = sta ?: ERR_PTR(-ENOENT); 2491 return 0; 2492 } 2493 2494 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2495 struct sk_buff *skb, 2496 u32 *info_flags, 2497 u64 *cookie) 2498 { 2499 struct sk_buff *ack_skb; 2500 u16 info_id = 0; 2501 2502 if (skb->sk) 2503 ack_skb = skb_clone_sk(skb); 2504 else 2505 ack_skb = skb_clone(skb, GFP_ATOMIC); 2506 2507 if (ack_skb) { 2508 unsigned long flags; 2509 int id; 2510 2511 spin_lock_irqsave(&local->ack_status_lock, flags); 2512 id = idr_alloc(&local->ack_status_frames, ack_skb, 2513 1, 0x2000, GFP_ATOMIC); 2514 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2515 2516 if (id >= 0) { 2517 info_id = id; 2518 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2519 if (cookie) { 2520 *cookie = ieee80211_mgmt_tx_cookie(local); 2521 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2522 } 2523 } else { 2524 kfree_skb(ack_skb); 2525 } 2526 } 2527 2528 return info_id; 2529 } 2530 2531 /** 2532 * ieee80211_build_hdr - build 802.11 header in the given frame 2533 * @sdata: virtual interface to build the header for 2534 * @skb: the skb to build the header in 2535 * @info_flags: skb flags to set 2536 * @sta: the station pointer 2537 * @ctrl_flags: info control flags to set 2538 * @cookie: cookie pointer to fill (if not %NULL) 2539 * 2540 * This function takes the skb with 802.3 header and reformats the header to 2541 * the appropriate IEEE 802.11 header based on which interface the packet is 2542 * being transmitted on. 2543 * 2544 * Note that this function also takes care of the TX status request and 2545 * potential unsharing of the SKB - this needs to be interleaved with the 2546 * header building. 2547 * 2548 * The function requires the read-side RCU lock held 2549 * 2550 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2551 */ 2552 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2553 struct sk_buff *skb, u32 info_flags, 2554 struct sta_info *sta, u32 ctrl_flags, 2555 u64 *cookie) 2556 { 2557 struct ieee80211_local *local = sdata->local; 2558 struct ieee80211_tx_info *info; 2559 int head_need; 2560 u16 ethertype, hdrlen, meshhdrlen = 0; 2561 __le16 fc; 2562 struct ieee80211_hdr hdr; 2563 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2564 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2565 const u8 *encaps_data; 2566 int encaps_len, skip_header_bytes; 2567 bool wme_sta = false, authorized = false; 2568 bool tdls_peer; 2569 bool multicast; 2570 u16 info_id = 0; 2571 struct ieee80211_chanctx_conf *chanctx_conf; 2572 struct ieee80211_sub_if_data *ap_sdata; 2573 enum nl80211_band band; 2574 int ret; 2575 2576 if (IS_ERR(sta)) 2577 sta = NULL; 2578 2579 #ifdef CONFIG_MAC80211_DEBUGFS 2580 if (local->force_tx_status) 2581 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2582 #endif 2583 2584 /* convert Ethernet header to proper 802.11 header (based on 2585 * operation mode) */ 2586 ethertype = (skb->data[12] << 8) | skb->data[13]; 2587 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2588 2589 switch (sdata->vif.type) { 2590 case NL80211_IFTYPE_AP_VLAN: 2591 if (sdata->wdev.use_4addr) { 2592 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2593 /* RA TA DA SA */ 2594 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2595 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2596 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2597 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2598 hdrlen = 30; 2599 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2600 wme_sta = sta->sta.wme; 2601 } 2602 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2603 u.ap); 2604 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2605 if (!chanctx_conf) { 2606 ret = -ENOTCONN; 2607 goto free; 2608 } 2609 band = chanctx_conf->def.chan->band; 2610 if (sdata->wdev.use_4addr) 2611 break; 2612 fallthrough; 2613 case NL80211_IFTYPE_AP: 2614 if (sdata->vif.type == NL80211_IFTYPE_AP) 2615 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2616 if (!chanctx_conf) { 2617 ret = -ENOTCONN; 2618 goto free; 2619 } 2620 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2621 /* DA BSSID SA */ 2622 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2623 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2624 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2625 hdrlen = 24; 2626 band = chanctx_conf->def.chan->band; 2627 break; 2628 #ifdef CONFIG_MAC80211_MESH 2629 case NL80211_IFTYPE_MESH_POINT: 2630 if (!is_multicast_ether_addr(skb->data)) { 2631 struct sta_info *next_hop; 2632 bool mpp_lookup = true; 2633 2634 mpath = mesh_path_lookup(sdata, skb->data); 2635 if (mpath) { 2636 mpp_lookup = false; 2637 next_hop = rcu_dereference(mpath->next_hop); 2638 if (!next_hop || 2639 !(mpath->flags & (MESH_PATH_ACTIVE | 2640 MESH_PATH_RESOLVING))) 2641 mpp_lookup = true; 2642 } 2643 2644 if (mpp_lookup) { 2645 mppath = mpp_path_lookup(sdata, skb->data); 2646 if (mppath) 2647 mppath->exp_time = jiffies; 2648 } 2649 2650 if (mppath && mpath) 2651 mesh_path_del(sdata, mpath->dst); 2652 } 2653 2654 /* 2655 * Use address extension if it is a packet from 2656 * another interface or if we know the destination 2657 * is being proxied by a portal (i.e. portal address 2658 * differs from proxied address) 2659 */ 2660 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2661 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2662 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2663 skb->data, skb->data + ETH_ALEN); 2664 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2665 NULL, NULL); 2666 } else { 2667 /* DS -> MBSS (802.11-2012 13.11.3.3). 2668 * For unicast with unknown forwarding information, 2669 * destination might be in the MBSS or if that fails 2670 * forwarded to another mesh gate. In either case 2671 * resolution will be handled in ieee80211_xmit(), so 2672 * leave the original DA. This also works for mcast */ 2673 const u8 *mesh_da = skb->data; 2674 2675 if (mppath) 2676 mesh_da = mppath->mpp; 2677 else if (mpath) 2678 mesh_da = mpath->dst; 2679 2680 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2681 mesh_da, sdata->vif.addr); 2682 if (is_multicast_ether_addr(mesh_da)) 2683 /* DA TA mSA AE:SA */ 2684 meshhdrlen = ieee80211_new_mesh_header( 2685 sdata, &mesh_hdr, 2686 skb->data + ETH_ALEN, NULL); 2687 else 2688 /* RA TA mDA mSA AE:DA SA */ 2689 meshhdrlen = ieee80211_new_mesh_header( 2690 sdata, &mesh_hdr, skb->data, 2691 skb->data + ETH_ALEN); 2692 2693 } 2694 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2695 if (!chanctx_conf) { 2696 ret = -ENOTCONN; 2697 goto free; 2698 } 2699 band = chanctx_conf->def.chan->band; 2700 2701 /* For injected frames, fill RA right away as nexthop lookup 2702 * will be skipped. 2703 */ 2704 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2705 is_zero_ether_addr(hdr.addr1)) 2706 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2707 break; 2708 #endif 2709 case NL80211_IFTYPE_STATION: 2710 /* we already did checks when looking up the RA STA */ 2711 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2712 2713 if (tdls_peer) { 2714 /* DA SA BSSID */ 2715 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2716 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2717 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2718 hdrlen = 24; 2719 } else if (sdata->u.mgd.use_4addr && 2720 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2721 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2722 IEEE80211_FCTL_TODS); 2723 /* RA TA DA SA */ 2724 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2725 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2726 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2727 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2728 hdrlen = 30; 2729 } else { 2730 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2731 /* BSSID SA DA */ 2732 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2733 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2734 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2735 hdrlen = 24; 2736 } 2737 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2738 if (!chanctx_conf) { 2739 ret = -ENOTCONN; 2740 goto free; 2741 } 2742 band = chanctx_conf->def.chan->band; 2743 break; 2744 case NL80211_IFTYPE_OCB: 2745 /* DA SA BSSID */ 2746 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2747 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2748 eth_broadcast_addr(hdr.addr3); 2749 hdrlen = 24; 2750 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2751 if (!chanctx_conf) { 2752 ret = -ENOTCONN; 2753 goto free; 2754 } 2755 band = chanctx_conf->def.chan->band; 2756 break; 2757 case NL80211_IFTYPE_ADHOC: 2758 /* DA SA BSSID */ 2759 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2760 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2761 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2762 hdrlen = 24; 2763 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2764 if (!chanctx_conf) { 2765 ret = -ENOTCONN; 2766 goto free; 2767 } 2768 band = chanctx_conf->def.chan->band; 2769 break; 2770 default: 2771 ret = -EINVAL; 2772 goto free; 2773 } 2774 2775 multicast = is_multicast_ether_addr(hdr.addr1); 2776 2777 /* sta is always NULL for mesh */ 2778 if (sta) { 2779 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2780 wme_sta = sta->sta.wme; 2781 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2782 /* For mesh, the use of the QoS header is mandatory */ 2783 wme_sta = true; 2784 } 2785 2786 /* receiver does QoS (which also means we do) use it */ 2787 if (wme_sta) { 2788 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2789 hdrlen += 2; 2790 } 2791 2792 /* 2793 * Drop unicast frames to unauthorised stations unless they are 2794 * EAPOL frames from the local station. 2795 */ 2796 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2797 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2798 !multicast && !authorized && 2799 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2800 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2801 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2802 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2803 sdata->name, hdr.addr1); 2804 #endif 2805 2806 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2807 2808 ret = -EPERM; 2809 goto free; 2810 } 2811 2812 if (unlikely(!multicast && ((skb->sk && 2813 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2814 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2815 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2816 cookie); 2817 2818 /* 2819 * If the skb is shared we need to obtain our own copy. 2820 */ 2821 skb = skb_share_check(skb, GFP_ATOMIC); 2822 if (unlikely(!skb)) { 2823 ret = -ENOMEM; 2824 goto free; 2825 } 2826 2827 hdr.frame_control = fc; 2828 hdr.duration_id = 0; 2829 hdr.seq_ctrl = 0; 2830 2831 skip_header_bytes = ETH_HLEN; 2832 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2833 encaps_data = bridge_tunnel_header; 2834 encaps_len = sizeof(bridge_tunnel_header); 2835 skip_header_bytes -= 2; 2836 } else if (ethertype >= ETH_P_802_3_MIN) { 2837 encaps_data = rfc1042_header; 2838 encaps_len = sizeof(rfc1042_header); 2839 skip_header_bytes -= 2; 2840 } else { 2841 encaps_data = NULL; 2842 encaps_len = 0; 2843 } 2844 2845 skb_pull(skb, skip_header_bytes); 2846 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2847 2848 /* 2849 * So we need to modify the skb header and hence need a copy of 2850 * that. The head_need variable above doesn't, so far, include 2851 * the needed header space that we don't need right away. If we 2852 * can, then we don't reallocate right now but only after the 2853 * frame arrives at the master device (if it does...) 2854 * 2855 * If we cannot, however, then we will reallocate to include all 2856 * the ever needed space. Also, if we need to reallocate it anyway, 2857 * make it big enough for everything we may ever need. 2858 */ 2859 2860 if (head_need > 0 || skb_cloned(skb)) { 2861 head_need += sdata->encrypt_headroom; 2862 head_need += local->tx_headroom; 2863 head_need = max_t(int, 0, head_need); 2864 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2865 ieee80211_free_txskb(&local->hw, skb); 2866 skb = NULL; 2867 return ERR_PTR(-ENOMEM); 2868 } 2869 } 2870 2871 if (encaps_data) 2872 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2873 2874 #ifdef CONFIG_MAC80211_MESH 2875 if (meshhdrlen > 0) 2876 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2877 #endif 2878 2879 if (ieee80211_is_data_qos(fc)) { 2880 __le16 *qos_control; 2881 2882 qos_control = skb_push(skb, 2); 2883 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2884 /* 2885 * Maybe we could actually set some fields here, for now just 2886 * initialise to zero to indicate no special operation. 2887 */ 2888 *qos_control = 0; 2889 } else 2890 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2891 2892 skb_reset_mac_header(skb); 2893 2894 info = IEEE80211_SKB_CB(skb); 2895 memset(info, 0, sizeof(*info)); 2896 2897 info->flags = info_flags; 2898 info->ack_frame_id = info_id; 2899 info->band = band; 2900 info->control.flags = ctrl_flags; 2901 2902 return skb; 2903 free: 2904 kfree_skb(skb); 2905 return ERR_PTR(ret); 2906 } 2907 2908 /* 2909 * fast-xmit overview 2910 * 2911 * The core idea of this fast-xmit is to remove per-packet checks by checking 2912 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2913 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2914 * much less work can be done per packet. For example, fragmentation must be 2915 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2916 * in the code here. 2917 * 2918 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2919 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2920 * 2921 * The most difficult part of this is that when any of these assumptions 2922 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2923 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2924 * since the per-packet code no longer checks the conditions. This is reflected 2925 * by the calls to these functions throughout the rest of the code, and must be 2926 * maintained if any of the TX path checks change. 2927 */ 2928 2929 void ieee80211_check_fast_xmit(struct sta_info *sta) 2930 { 2931 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2932 struct ieee80211_local *local = sta->local; 2933 struct ieee80211_sub_if_data *sdata = sta->sdata; 2934 struct ieee80211_hdr *hdr = (void *)build.hdr; 2935 struct ieee80211_chanctx_conf *chanctx_conf; 2936 __le16 fc; 2937 2938 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2939 return; 2940 2941 /* Locking here protects both the pointer itself, and against concurrent 2942 * invocations winning data access races to, e.g., the key pointer that 2943 * is used. 2944 * Without it, the invocation of this function right after the key 2945 * pointer changes wouldn't be sufficient, as another CPU could access 2946 * the pointer, then stall, and then do the cache update after the CPU 2947 * that invalidated the key. 2948 * With the locking, such scenarios cannot happen as the check for the 2949 * key and the fast-tx assignment are done atomically, so the CPU that 2950 * modifies the key will either wait or other one will see the key 2951 * cleared/changed already. 2952 */ 2953 spin_lock_bh(&sta->lock); 2954 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2955 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2956 sdata->vif.type == NL80211_IFTYPE_STATION) 2957 goto out; 2958 2959 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2960 goto out; 2961 2962 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2963 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2964 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2965 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2966 goto out; 2967 2968 if (sdata->noack_map) 2969 goto out; 2970 2971 /* fast-xmit doesn't handle fragmentation at all */ 2972 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2973 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2974 goto out; 2975 2976 rcu_read_lock(); 2977 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2978 if (!chanctx_conf) { 2979 rcu_read_unlock(); 2980 goto out; 2981 } 2982 build.band = chanctx_conf->def.chan->band; 2983 rcu_read_unlock(); 2984 2985 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2986 2987 switch (sdata->vif.type) { 2988 case NL80211_IFTYPE_ADHOC: 2989 /* DA SA BSSID */ 2990 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2991 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2992 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2993 build.hdr_len = 24; 2994 break; 2995 case NL80211_IFTYPE_STATION: 2996 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2997 /* DA SA BSSID */ 2998 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2999 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3000 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 3001 build.hdr_len = 24; 3002 break; 3003 } 3004 3005 if (sdata->u.mgd.use_4addr) { 3006 /* non-regular ethertype cannot use the fastpath */ 3007 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3008 IEEE80211_FCTL_TODS); 3009 /* RA TA DA SA */ 3010 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 3011 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3012 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3013 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3014 build.hdr_len = 30; 3015 break; 3016 } 3017 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3018 /* BSSID SA DA */ 3019 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 3020 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3021 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3022 build.hdr_len = 24; 3023 break; 3024 case NL80211_IFTYPE_AP_VLAN: 3025 if (sdata->wdev.use_4addr) { 3026 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3027 IEEE80211_FCTL_TODS); 3028 /* RA TA DA SA */ 3029 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3030 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3031 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3032 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3033 build.hdr_len = 30; 3034 break; 3035 } 3036 fallthrough; 3037 case NL80211_IFTYPE_AP: 3038 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3039 /* DA BSSID SA */ 3040 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3041 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3042 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3043 build.hdr_len = 24; 3044 break; 3045 default: 3046 /* not handled on fast-xmit */ 3047 goto out; 3048 } 3049 3050 if (sta->sta.wme) { 3051 build.hdr_len += 2; 3052 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3053 } 3054 3055 /* We store the key here so there's no point in using rcu_dereference() 3056 * but that's fine because the code that changes the pointers will call 3057 * this function after doing so. For a single CPU that would be enough, 3058 * for multiple see the comment above. 3059 */ 3060 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3061 if (!build.key) 3062 build.key = rcu_access_pointer(sdata->default_unicast_key); 3063 if (build.key) { 3064 bool gen_iv, iv_spc, mmic; 3065 3066 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3067 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3068 mmic = build.key->conf.flags & 3069 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3070 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3071 3072 /* don't handle software crypto */ 3073 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3074 goto out; 3075 3076 /* Key is being removed */ 3077 if (build.key->flags & KEY_FLAG_TAINTED) 3078 goto out; 3079 3080 switch (build.key->conf.cipher) { 3081 case WLAN_CIPHER_SUITE_CCMP: 3082 case WLAN_CIPHER_SUITE_CCMP_256: 3083 if (gen_iv) 3084 build.pn_offs = build.hdr_len; 3085 if (gen_iv || iv_spc) 3086 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3087 break; 3088 case WLAN_CIPHER_SUITE_GCMP: 3089 case WLAN_CIPHER_SUITE_GCMP_256: 3090 if (gen_iv) 3091 build.pn_offs = build.hdr_len; 3092 if (gen_iv || iv_spc) 3093 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3094 break; 3095 case WLAN_CIPHER_SUITE_TKIP: 3096 /* cannot handle MMIC or IV generation in xmit-fast */ 3097 if (mmic || gen_iv) 3098 goto out; 3099 if (iv_spc) 3100 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3101 break; 3102 case WLAN_CIPHER_SUITE_WEP40: 3103 case WLAN_CIPHER_SUITE_WEP104: 3104 /* cannot handle IV generation in fast-xmit */ 3105 if (gen_iv) 3106 goto out; 3107 if (iv_spc) 3108 build.hdr_len += IEEE80211_WEP_IV_LEN; 3109 break; 3110 case WLAN_CIPHER_SUITE_AES_CMAC: 3111 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3112 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3113 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3114 WARN(1, 3115 "management cipher suite 0x%x enabled for data\n", 3116 build.key->conf.cipher); 3117 goto out; 3118 default: 3119 /* we don't know how to generate IVs for this at all */ 3120 if (WARN_ON(gen_iv)) 3121 goto out; 3122 /* pure hardware keys are OK, of course */ 3123 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3124 break; 3125 /* cipher scheme might require space allocation */ 3126 if (iv_spc && 3127 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3128 goto out; 3129 if (iv_spc) 3130 build.hdr_len += build.key->conf.iv_len; 3131 } 3132 3133 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3134 } 3135 3136 hdr->frame_control = fc; 3137 3138 memcpy(build.hdr + build.hdr_len, 3139 rfc1042_header, sizeof(rfc1042_header)); 3140 build.hdr_len += sizeof(rfc1042_header); 3141 3142 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3143 /* if the kmemdup fails, continue w/o fast_tx */ 3144 3145 out: 3146 /* we might have raced against another call to this function */ 3147 old = rcu_dereference_protected(sta->fast_tx, 3148 lockdep_is_held(&sta->lock)); 3149 rcu_assign_pointer(sta->fast_tx, fast_tx); 3150 if (old) 3151 kfree_rcu(old, rcu_head); 3152 spin_unlock_bh(&sta->lock); 3153 } 3154 3155 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3156 { 3157 struct sta_info *sta; 3158 3159 rcu_read_lock(); 3160 list_for_each_entry_rcu(sta, &local->sta_list, list) 3161 ieee80211_check_fast_xmit(sta); 3162 rcu_read_unlock(); 3163 } 3164 3165 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3166 { 3167 struct ieee80211_local *local = sdata->local; 3168 struct sta_info *sta; 3169 3170 rcu_read_lock(); 3171 3172 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3173 if (sdata != sta->sdata && 3174 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3175 continue; 3176 ieee80211_check_fast_xmit(sta); 3177 } 3178 3179 rcu_read_unlock(); 3180 } 3181 3182 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3183 { 3184 struct ieee80211_fast_tx *fast_tx; 3185 3186 spin_lock_bh(&sta->lock); 3187 fast_tx = rcu_dereference_protected(sta->fast_tx, 3188 lockdep_is_held(&sta->lock)); 3189 RCU_INIT_POINTER(sta->fast_tx, NULL); 3190 spin_unlock_bh(&sta->lock); 3191 3192 if (fast_tx) 3193 kfree_rcu(fast_tx, rcu_head); 3194 } 3195 3196 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3197 struct sk_buff *skb, int headroom) 3198 { 3199 if (skb_headroom(skb) < headroom) { 3200 I802_DEBUG_INC(local->tx_expand_skb_head); 3201 3202 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3203 wiphy_debug(local->hw.wiphy, 3204 "failed to reallocate TX buffer\n"); 3205 return false; 3206 } 3207 } 3208 3209 return true; 3210 } 3211 3212 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3213 struct ieee80211_fast_tx *fast_tx, 3214 struct sk_buff *skb) 3215 { 3216 struct ieee80211_local *local = sdata->local; 3217 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3218 struct ieee80211_hdr *hdr; 3219 struct ethhdr *amsdu_hdr; 3220 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3221 int subframe_len = skb->len - hdr_len; 3222 void *data; 3223 u8 *qc, *h_80211_src, *h_80211_dst; 3224 const u8 *bssid; 3225 3226 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3227 return false; 3228 3229 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3230 return true; 3231 3232 if (!ieee80211_amsdu_realloc_pad(local, skb, 3233 sizeof(*amsdu_hdr) + 3234 local->hw.extra_tx_headroom)) 3235 return false; 3236 3237 data = skb_push(skb, sizeof(*amsdu_hdr)); 3238 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3239 hdr = data; 3240 amsdu_hdr = data + hdr_len; 3241 /* h_80211_src/dst is addr* field within hdr */ 3242 h_80211_src = data + fast_tx->sa_offs; 3243 h_80211_dst = data + fast_tx->da_offs; 3244 3245 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3246 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3247 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3248 3249 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3250 * fields needs to be changed to BSSID for A-MSDU frames depending 3251 * on FromDS/ToDS values. 3252 */ 3253 switch (sdata->vif.type) { 3254 case NL80211_IFTYPE_STATION: 3255 bssid = sdata->u.mgd.bssid; 3256 break; 3257 case NL80211_IFTYPE_AP: 3258 case NL80211_IFTYPE_AP_VLAN: 3259 bssid = sdata->vif.addr; 3260 break; 3261 default: 3262 bssid = NULL; 3263 } 3264 3265 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3266 ether_addr_copy(h_80211_src, bssid); 3267 3268 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3269 ether_addr_copy(h_80211_dst, bssid); 3270 3271 qc = ieee80211_get_qos_ctl(hdr); 3272 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3273 3274 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3275 3276 return true; 3277 } 3278 3279 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3280 struct sta_info *sta, 3281 struct ieee80211_fast_tx *fast_tx, 3282 struct sk_buff *skb) 3283 { 3284 struct ieee80211_local *local = sdata->local; 3285 struct fq *fq = &local->fq; 3286 struct fq_tin *tin; 3287 struct fq_flow *flow; 3288 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3289 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3290 struct txq_info *txqi; 3291 struct sk_buff **frag_tail, *head; 3292 int subframe_len = skb->len - ETH_ALEN; 3293 u8 max_subframes = sta->sta.max_amsdu_subframes; 3294 int max_frags = local->hw.max_tx_fragments; 3295 int max_amsdu_len = sta->sta.max_amsdu_len; 3296 int orig_truesize; 3297 u32 flow_idx; 3298 __be16 len; 3299 void *data; 3300 bool ret = false; 3301 unsigned int orig_len; 3302 int n = 2, nfrags, pad = 0; 3303 u16 hdrlen; 3304 3305 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3306 return false; 3307 3308 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3309 return false; 3310 3311 if (skb_is_gso(skb)) 3312 return false; 3313 3314 if (!txq) 3315 return false; 3316 3317 txqi = to_txq_info(txq); 3318 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3319 return false; 3320 3321 if (sta->sta.max_rc_amsdu_len) 3322 max_amsdu_len = min_t(int, max_amsdu_len, 3323 sta->sta.max_rc_amsdu_len); 3324 3325 if (sta->sta.max_tid_amsdu_len[tid]) 3326 max_amsdu_len = min_t(int, max_amsdu_len, 3327 sta->sta.max_tid_amsdu_len[tid]); 3328 3329 flow_idx = fq_flow_idx(fq, skb); 3330 3331 spin_lock_bh(&fq->lock); 3332 3333 /* TODO: Ideally aggregation should be done on dequeue to remain 3334 * responsive to environment changes. 3335 */ 3336 3337 tin = &txqi->tin; 3338 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3339 head = skb_peek_tail(&flow->queue); 3340 if (!head || skb_is_gso(head)) 3341 goto out; 3342 3343 orig_truesize = head->truesize; 3344 orig_len = head->len; 3345 3346 if (skb->len + head->len > max_amsdu_len) 3347 goto out; 3348 3349 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3350 nfrags += 1 + skb_shinfo(head)->nr_frags; 3351 frag_tail = &skb_shinfo(head)->frag_list; 3352 while (*frag_tail) { 3353 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3354 frag_tail = &(*frag_tail)->next; 3355 n++; 3356 } 3357 3358 if (max_subframes && n > max_subframes) 3359 goto out; 3360 3361 if (max_frags && nfrags > max_frags) 3362 goto out; 3363 3364 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3365 goto out; 3366 3367 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3368 goto out; 3369 3370 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3371 * and frag_tail should be &skb_shinfo(head)->frag_list. 3372 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3373 * Reload frag_tail to have it pointing to the correct place. 3374 */ 3375 if (n == 2) 3376 frag_tail = &skb_shinfo(head)->frag_list; 3377 3378 /* 3379 * Pad out the previous subframe to a multiple of 4 by adding the 3380 * padding to the next one, that's being added. Note that head->len 3381 * is the length of the full A-MSDU, but that works since each time 3382 * we add a new subframe we pad out the previous one to a multiple 3383 * of 4 and thus it no longer matters in the next round. 3384 */ 3385 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3386 if ((head->len - hdrlen) & 3) 3387 pad = 4 - ((head->len - hdrlen) & 3); 3388 3389 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3390 2 + pad)) 3391 goto out_recalc; 3392 3393 ret = true; 3394 data = skb_push(skb, ETH_ALEN + 2); 3395 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3396 3397 data += 2 * ETH_ALEN; 3398 len = cpu_to_be16(subframe_len); 3399 memcpy(data, &len, 2); 3400 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3401 3402 memset(skb_push(skb, pad), 0, pad); 3403 3404 head->len += skb->len; 3405 head->data_len += skb->len; 3406 *frag_tail = skb; 3407 3408 out_recalc: 3409 fq->memory_usage += head->truesize - orig_truesize; 3410 if (head->len != orig_len) { 3411 flow->backlog += head->len - orig_len; 3412 tin->backlog_bytes += head->len - orig_len; 3413 } 3414 out: 3415 spin_unlock_bh(&fq->lock); 3416 3417 return ret; 3418 } 3419 3420 /* 3421 * Can be called while the sta lock is held. Anything that can cause packets to 3422 * be generated will cause deadlock! 3423 */ 3424 static ieee80211_tx_result 3425 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3426 struct sta_info *sta, u8 pn_offs, 3427 struct ieee80211_key *key, 3428 struct ieee80211_tx_data *tx) 3429 { 3430 struct sk_buff *skb = tx->skb; 3431 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3432 struct ieee80211_hdr *hdr = (void *)skb->data; 3433 u8 tid = IEEE80211_NUM_TIDS; 3434 3435 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3436 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3437 return TX_DROP; 3438 3439 if (key) 3440 info->control.hw_key = &key->conf; 3441 3442 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3443 3444 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3445 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3446 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3447 } else { 3448 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3449 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3450 sdata->sequence_number += 0x10; 3451 } 3452 3453 if (skb_shinfo(skb)->gso_size) 3454 sta->deflink.tx_stats.msdu[tid] += 3455 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3456 else 3457 sta->deflink.tx_stats.msdu[tid]++; 3458 3459 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3460 3461 /* statistics normally done by ieee80211_tx_h_stats (but that 3462 * has to consider fragmentation, so is more complex) 3463 */ 3464 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3465 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3466 3467 if (pn_offs) { 3468 u64 pn; 3469 u8 *crypto_hdr = skb->data + pn_offs; 3470 3471 switch (key->conf.cipher) { 3472 case WLAN_CIPHER_SUITE_CCMP: 3473 case WLAN_CIPHER_SUITE_CCMP_256: 3474 case WLAN_CIPHER_SUITE_GCMP: 3475 case WLAN_CIPHER_SUITE_GCMP_256: 3476 pn = atomic64_inc_return(&key->conf.tx_pn); 3477 crypto_hdr[0] = pn; 3478 crypto_hdr[1] = pn >> 8; 3479 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3480 crypto_hdr[4] = pn >> 16; 3481 crypto_hdr[5] = pn >> 24; 3482 crypto_hdr[6] = pn >> 32; 3483 crypto_hdr[7] = pn >> 40; 3484 break; 3485 } 3486 } 3487 3488 return TX_CONTINUE; 3489 } 3490 3491 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3492 struct sta_info *sta, 3493 struct ieee80211_fast_tx *fast_tx, 3494 struct sk_buff *skb) 3495 { 3496 struct ieee80211_local *local = sdata->local; 3497 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3498 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3499 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3500 struct ethhdr eth; 3501 struct ieee80211_tx_info *info; 3502 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3503 struct ieee80211_tx_data tx; 3504 ieee80211_tx_result r; 3505 struct tid_ampdu_tx *tid_tx = NULL; 3506 u8 tid = IEEE80211_NUM_TIDS; 3507 3508 /* control port protocol needs a lot of special handling */ 3509 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3510 return false; 3511 3512 /* only RFC 1042 SNAP */ 3513 if (ethertype < ETH_P_802_3_MIN) 3514 return false; 3515 3516 /* don't handle TX status request here either */ 3517 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3518 return false; 3519 3520 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3521 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3522 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3523 if (tid_tx) { 3524 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3525 return false; 3526 if (tid_tx->timeout) 3527 tid_tx->last_tx = jiffies; 3528 } 3529 } 3530 3531 /* after this point (skb is modified) we cannot return false */ 3532 3533 skb = skb_share_check(skb, GFP_ATOMIC); 3534 if (unlikely(!skb)) 3535 return true; 3536 3537 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3538 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3539 return true; 3540 3541 /* will not be crypto-handled beyond what we do here, so use false 3542 * as the may-encrypt argument for the resize to not account for 3543 * more room than we already have in 'extra_head' 3544 */ 3545 if (unlikely(ieee80211_skb_resize(sdata, skb, 3546 max_t(int, extra_head + hw_headroom - 3547 skb_headroom(skb), 0), 3548 ENCRYPT_NO))) { 3549 kfree_skb(skb); 3550 return true; 3551 } 3552 3553 memcpy(ð, skb->data, ETH_HLEN - 2); 3554 hdr = skb_push(skb, extra_head); 3555 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3556 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3557 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3558 3559 info = IEEE80211_SKB_CB(skb); 3560 memset(info, 0, sizeof(*info)); 3561 info->band = fast_tx->band; 3562 info->control.vif = &sdata->vif; 3563 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3564 IEEE80211_TX_CTL_DONTFRAG | 3565 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3566 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3567 3568 #ifdef CONFIG_MAC80211_DEBUGFS 3569 if (local->force_tx_status) 3570 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3571 #endif 3572 3573 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3574 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3575 *ieee80211_get_qos_ctl(hdr) = tid; 3576 } 3577 3578 __skb_queue_head_init(&tx.skbs); 3579 3580 tx.flags = IEEE80211_TX_UNICAST; 3581 tx.local = local; 3582 tx.sdata = sdata; 3583 tx.sta = sta; 3584 tx.key = fast_tx->key; 3585 3586 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3587 return true; 3588 3589 tx.skb = skb; 3590 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3591 fast_tx->key, &tx); 3592 tx.skb = NULL; 3593 if (r == TX_DROP) { 3594 kfree_skb(skb); 3595 return true; 3596 } 3597 3598 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3599 sdata = container_of(sdata->bss, 3600 struct ieee80211_sub_if_data, u.ap); 3601 3602 __skb_queue_tail(&tx.skbs, skb); 3603 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3604 return true; 3605 } 3606 3607 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3608 struct ieee80211_txq *txq) 3609 { 3610 struct ieee80211_local *local = hw_to_local(hw); 3611 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3612 struct ieee80211_hdr *hdr; 3613 struct sk_buff *skb = NULL; 3614 struct fq *fq = &local->fq; 3615 struct fq_tin *tin = &txqi->tin; 3616 struct ieee80211_tx_info *info; 3617 struct ieee80211_tx_data tx; 3618 ieee80211_tx_result r; 3619 struct ieee80211_vif *vif = txq->vif; 3620 3621 WARN_ON_ONCE(softirq_count() == 0); 3622 3623 if (!ieee80211_txq_airtime_check(hw, txq)) 3624 return NULL; 3625 3626 begin: 3627 spin_lock_bh(&fq->lock); 3628 3629 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3630 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3631 goto out; 3632 3633 if (vif->txqs_stopped[txq->ac]) { 3634 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3635 goto out; 3636 } 3637 3638 /* Make sure fragments stay together. */ 3639 skb = __skb_dequeue(&txqi->frags); 3640 if (unlikely(skb)) { 3641 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3642 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3643 goto out; 3644 IEEE80211_SKB_CB(skb)->control.flags &= 3645 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3646 } else { 3647 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3648 } 3649 3650 if (!skb) 3651 goto out; 3652 3653 spin_unlock_bh(&fq->lock); 3654 3655 hdr = (struct ieee80211_hdr *)skb->data; 3656 info = IEEE80211_SKB_CB(skb); 3657 3658 memset(&tx, 0, sizeof(tx)); 3659 __skb_queue_head_init(&tx.skbs); 3660 tx.local = local; 3661 tx.skb = skb; 3662 tx.sdata = vif_to_sdata(info->control.vif); 3663 3664 if (txq->sta) { 3665 tx.sta = container_of(txq->sta, struct sta_info, sta); 3666 /* 3667 * Drop unicast frames to unauthorised stations unless they are 3668 * injected frames or EAPOL frames from the local station. 3669 */ 3670 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3671 ieee80211_is_data(hdr->frame_control) && 3672 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3673 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3674 !is_multicast_ether_addr(hdr->addr1) && 3675 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3676 (!(info->control.flags & 3677 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3678 !ether_addr_equal(tx.sdata->vif.addr, 3679 hdr->addr2)))) { 3680 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3681 ieee80211_free_txskb(&local->hw, skb); 3682 goto begin; 3683 } 3684 } 3685 3686 /* 3687 * The key can be removed while the packet was queued, so need to call 3688 * this here to get the current key. 3689 */ 3690 r = ieee80211_tx_h_select_key(&tx); 3691 if (r != TX_CONTINUE) { 3692 ieee80211_free_txskb(&local->hw, skb); 3693 goto begin; 3694 } 3695 3696 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3697 info->flags |= IEEE80211_TX_CTL_AMPDU; 3698 else 3699 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3700 3701 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3702 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3703 r = ieee80211_tx_h_rate_ctrl(&tx); 3704 if (r != TX_CONTINUE) { 3705 ieee80211_free_txskb(&local->hw, skb); 3706 goto begin; 3707 } 3708 } 3709 goto encap_out; 3710 } 3711 3712 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3713 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3714 sta); 3715 u8 pn_offs = 0; 3716 3717 if (tx.key && 3718 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3719 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3720 3721 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3722 tx.key, &tx); 3723 if (r != TX_CONTINUE) { 3724 ieee80211_free_txskb(&local->hw, skb); 3725 goto begin; 3726 } 3727 } else { 3728 if (invoke_tx_handlers_late(&tx)) 3729 goto begin; 3730 3731 skb = __skb_dequeue(&tx.skbs); 3732 3733 if (!skb_queue_empty(&tx.skbs)) { 3734 spin_lock_bh(&fq->lock); 3735 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3736 spin_unlock_bh(&fq->lock); 3737 } 3738 } 3739 3740 if (skb_has_frag_list(skb) && 3741 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3742 if (skb_linearize(skb)) { 3743 ieee80211_free_txskb(&local->hw, skb); 3744 goto begin; 3745 } 3746 } 3747 3748 switch (tx.sdata->vif.type) { 3749 case NL80211_IFTYPE_MONITOR: 3750 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3751 vif = &tx.sdata->vif; 3752 break; 3753 } 3754 tx.sdata = rcu_dereference(local->monitor_sdata); 3755 if (tx.sdata) { 3756 vif = &tx.sdata->vif; 3757 info->hw_queue = 3758 vif->hw_queue[skb_get_queue_mapping(skb)]; 3759 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3760 ieee80211_free_txskb(&local->hw, skb); 3761 goto begin; 3762 } else { 3763 vif = NULL; 3764 } 3765 break; 3766 case NL80211_IFTYPE_AP_VLAN: 3767 tx.sdata = container_of(tx.sdata->bss, 3768 struct ieee80211_sub_if_data, u.ap); 3769 fallthrough; 3770 default: 3771 vif = &tx.sdata->vif; 3772 break; 3773 } 3774 3775 encap_out: 3776 IEEE80211_SKB_CB(skb)->control.vif = vif; 3777 3778 if (vif && 3779 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3780 bool ampdu = txq->ac != IEEE80211_AC_VO; 3781 u32 airtime; 3782 3783 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3784 skb->len, ampdu); 3785 if (airtime) { 3786 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3787 ieee80211_sta_update_pending_airtime(local, tx.sta, 3788 txq->ac, 3789 airtime, 3790 false); 3791 } 3792 } 3793 3794 return skb; 3795 3796 out: 3797 spin_unlock_bh(&fq->lock); 3798 3799 return skb; 3800 } 3801 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3802 3803 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3804 { 3805 struct ieee80211_local *local = hw_to_local(hw); 3806 struct airtime_sched_info *air_sched; 3807 u64 now = ktime_get_coarse_boottime_ns(); 3808 struct ieee80211_txq *ret = NULL; 3809 struct airtime_info *air_info; 3810 struct txq_info *txqi = NULL; 3811 struct rb_node *node; 3812 bool first = false; 3813 3814 air_sched = &local->airtime[ac]; 3815 spin_lock_bh(&air_sched->lock); 3816 3817 node = air_sched->schedule_pos; 3818 3819 begin: 3820 if (!node) { 3821 node = rb_first_cached(&air_sched->active_txqs); 3822 first = true; 3823 } else { 3824 node = rb_next(node); 3825 } 3826 3827 if (!node) 3828 goto out; 3829 3830 txqi = container_of(node, struct txq_info, schedule_order); 3831 air_info = to_airtime_info(&txqi->txq); 3832 3833 if (air_info->v_t > air_sched->v_t && 3834 (!first || !airtime_catchup_v_t(air_sched, air_info->v_t, now))) 3835 goto out; 3836 3837 if (!ieee80211_txq_airtime_check(hw, &txqi->txq)) { 3838 first = false; 3839 goto begin; 3840 } 3841 3842 air_sched->schedule_pos = node; 3843 air_sched->last_schedule_activity = now; 3844 ret = &txqi->txq; 3845 out: 3846 spin_unlock_bh(&air_sched->lock); 3847 return ret; 3848 } 3849 EXPORT_SYMBOL(ieee80211_next_txq); 3850 3851 static void __ieee80211_insert_txq(struct rb_root_cached *root, 3852 struct txq_info *txqi) 3853 { 3854 struct rb_node **new = &root->rb_root.rb_node; 3855 struct airtime_info *old_air, *new_air; 3856 struct rb_node *parent = NULL; 3857 struct txq_info *__txqi; 3858 bool leftmost = true; 3859 3860 while (*new) { 3861 parent = *new; 3862 __txqi = rb_entry(parent, struct txq_info, schedule_order); 3863 old_air = to_airtime_info(&__txqi->txq); 3864 new_air = to_airtime_info(&txqi->txq); 3865 3866 if (new_air->v_t <= old_air->v_t) { 3867 new = &parent->rb_left; 3868 } else { 3869 new = &parent->rb_right; 3870 leftmost = false; 3871 } 3872 } 3873 3874 rb_link_node(&txqi->schedule_order, parent, new); 3875 rb_insert_color_cached(&txqi->schedule_order, root, leftmost); 3876 } 3877 3878 void ieee80211_resort_txq(struct ieee80211_hw *hw, 3879 struct ieee80211_txq *txq) 3880 { 3881 struct airtime_info *air_info = to_airtime_info(txq); 3882 struct ieee80211_local *local = hw_to_local(hw); 3883 struct txq_info *txqi = to_txq_info(txq); 3884 struct airtime_sched_info *air_sched; 3885 3886 air_sched = &local->airtime[txq->ac]; 3887 3888 lockdep_assert_held(&air_sched->lock); 3889 3890 if (!RB_EMPTY_NODE(&txqi->schedule_order)) { 3891 struct airtime_info *a_prev = NULL, *a_next = NULL; 3892 struct txq_info *t_prev, *t_next; 3893 struct rb_node *n_prev, *n_next; 3894 3895 /* Erasing a node can cause an expensive rebalancing operation, 3896 * so we check the previous and next nodes first and only remove 3897 * and re-insert if the current node is not already in the 3898 * correct position. 3899 */ 3900 if ((n_prev = rb_prev(&txqi->schedule_order)) != NULL) { 3901 t_prev = container_of(n_prev, struct txq_info, 3902 schedule_order); 3903 a_prev = to_airtime_info(&t_prev->txq); 3904 } 3905 3906 if ((n_next = rb_next(&txqi->schedule_order)) != NULL) { 3907 t_next = container_of(n_next, struct txq_info, 3908 schedule_order); 3909 a_next = to_airtime_info(&t_next->txq); 3910 } 3911 3912 if ((!a_prev || a_prev->v_t <= air_info->v_t) && 3913 (!a_next || a_next->v_t > air_info->v_t)) 3914 return; 3915 3916 if (air_sched->schedule_pos == &txqi->schedule_order) 3917 air_sched->schedule_pos = n_prev; 3918 3919 rb_erase_cached(&txqi->schedule_order, 3920 &air_sched->active_txqs); 3921 RB_CLEAR_NODE(&txqi->schedule_order); 3922 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 3923 } 3924 } 3925 3926 void ieee80211_update_airtime_weight(struct ieee80211_local *local, 3927 struct airtime_sched_info *air_sched, 3928 u64 now, bool force) 3929 { 3930 struct airtime_info *air_info, *tmp; 3931 u64 weight_sum = 0; 3932 3933 if (unlikely(!now)) 3934 now = ktime_get_coarse_boottime_ns(); 3935 3936 lockdep_assert_held(&air_sched->lock); 3937 3938 if (!force && (air_sched->last_weight_update < 3939 now - AIRTIME_ACTIVE_DURATION)) 3940 return; 3941 3942 list_for_each_entry_safe(air_info, tmp, 3943 &air_sched->active_list, list) { 3944 if (airtime_is_active(air_info, now)) 3945 weight_sum += air_info->weight; 3946 else 3947 list_del_init(&air_info->list); 3948 } 3949 airtime_weight_sum_set(air_sched, weight_sum); 3950 air_sched->last_weight_update = now; 3951 } 3952 3953 void ieee80211_schedule_txq(struct ieee80211_hw *hw, 3954 struct ieee80211_txq *txq) 3955 __acquires(txq_lock) __releases(txq_lock) 3956 { 3957 struct ieee80211_local *local = hw_to_local(hw); 3958 struct txq_info *txqi = to_txq_info(txq); 3959 struct airtime_sched_info *air_sched; 3960 u64 now = ktime_get_coarse_boottime_ns(); 3961 struct airtime_info *air_info; 3962 u8 ac = txq->ac; 3963 bool was_active; 3964 3965 air_sched = &local->airtime[ac]; 3966 air_info = to_airtime_info(txq); 3967 3968 spin_lock_bh(&air_sched->lock); 3969 was_active = airtime_is_active(air_info, now); 3970 airtime_set_active(air_sched, air_info, now); 3971 3972 if (!RB_EMPTY_NODE(&txqi->schedule_order)) 3973 goto out; 3974 3975 /* If the station has been inactive for a while, catch up its v_t so it 3976 * doesn't get indefinite priority; see comment above the definition of 3977 * AIRTIME_MAX_BEHIND. 3978 */ 3979 if ((!was_active && air_info->v_t < air_sched->v_t) || 3980 air_info->v_t < air_sched->v_t - AIRTIME_MAX_BEHIND) 3981 air_info->v_t = air_sched->v_t; 3982 3983 ieee80211_update_airtime_weight(local, air_sched, now, !was_active); 3984 __ieee80211_insert_txq(&air_sched->active_txqs, txqi); 3985 3986 out: 3987 spin_unlock_bh(&air_sched->lock); 3988 } 3989 EXPORT_SYMBOL(ieee80211_schedule_txq); 3990 3991 static void __ieee80211_unschedule_txq(struct ieee80211_hw *hw, 3992 struct ieee80211_txq *txq, 3993 bool purge) 3994 { 3995 struct ieee80211_local *local = hw_to_local(hw); 3996 struct txq_info *txqi = to_txq_info(txq); 3997 struct airtime_sched_info *air_sched; 3998 struct airtime_info *air_info; 3999 4000 air_sched = &local->airtime[txq->ac]; 4001 air_info = to_airtime_info(&txqi->txq); 4002 4003 lockdep_assert_held(&air_sched->lock); 4004 4005 if (purge) { 4006 list_del_init(&air_info->list); 4007 ieee80211_update_airtime_weight(local, air_sched, 0, true); 4008 } 4009 4010 if (RB_EMPTY_NODE(&txqi->schedule_order)) 4011 return; 4012 4013 if (air_sched->schedule_pos == &txqi->schedule_order) 4014 air_sched->schedule_pos = rb_prev(&txqi->schedule_order); 4015 4016 if (!purge) 4017 airtime_set_active(air_sched, air_info, 4018 ktime_get_coarse_boottime_ns()); 4019 4020 rb_erase_cached(&txqi->schedule_order, 4021 &air_sched->active_txqs); 4022 RB_CLEAR_NODE(&txqi->schedule_order); 4023 } 4024 4025 void ieee80211_unschedule_txq(struct ieee80211_hw *hw, 4026 struct ieee80211_txq *txq, 4027 bool purge) 4028 __acquires(txq_lock) __releases(txq_lock) 4029 { 4030 struct ieee80211_local *local = hw_to_local(hw); 4031 4032 spin_lock_bh(&local->airtime[txq->ac].lock); 4033 __ieee80211_unschedule_txq(hw, txq, purge); 4034 spin_unlock_bh(&local->airtime[txq->ac].lock); 4035 } 4036 4037 void ieee80211_return_txq(struct ieee80211_hw *hw, 4038 struct ieee80211_txq *txq, bool force) 4039 { 4040 struct ieee80211_local *local = hw_to_local(hw); 4041 struct txq_info *txqi = to_txq_info(txq); 4042 4043 spin_lock_bh(&local->airtime[txq->ac].lock); 4044 4045 if (!RB_EMPTY_NODE(&txqi->schedule_order) && !force && 4046 !txq_has_queue(txq)) 4047 __ieee80211_unschedule_txq(hw, txq, false); 4048 4049 spin_unlock_bh(&local->airtime[txq->ac].lock); 4050 } 4051 EXPORT_SYMBOL(ieee80211_return_txq); 4052 4053 DEFINE_STATIC_KEY_FALSE(aql_disable); 4054 4055 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4056 struct ieee80211_txq *txq) 4057 { 4058 struct airtime_info *air_info = to_airtime_info(txq); 4059 struct ieee80211_local *local = hw_to_local(hw); 4060 4061 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4062 return true; 4063 4064 if (static_branch_unlikely(&aql_disable)) 4065 return true; 4066 4067 if (!txq->sta) 4068 return true; 4069 4070 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4071 return true; 4072 4073 if (atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_low) 4074 return true; 4075 4076 if (atomic_read(&local->aql_total_pending_airtime) < 4077 local->aql_threshold && 4078 atomic_read(&air_info->aql_tx_pending) < air_info->aql_limit_high) 4079 return true; 4080 4081 return false; 4082 } 4083 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4084 4085 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4086 struct ieee80211_txq *txq) 4087 { 4088 struct txq_info *first_txqi = NULL, *txqi = to_txq_info(txq); 4089 struct ieee80211_local *local = hw_to_local(hw); 4090 struct airtime_sched_info *air_sched; 4091 struct airtime_info *air_info; 4092 struct rb_node *node = NULL; 4093 bool ret = false; 4094 u64 now; 4095 4096 4097 if (!ieee80211_txq_airtime_check(hw, txq)) 4098 return false; 4099 4100 air_sched = &local->airtime[txq->ac]; 4101 spin_lock_bh(&air_sched->lock); 4102 4103 if (RB_EMPTY_NODE(&txqi->schedule_order)) 4104 goto out; 4105 4106 now = ktime_get_coarse_boottime_ns(); 4107 4108 /* Like in ieee80211_next_txq(), make sure the first station in the 4109 * scheduling order is eligible for transmission to avoid starvation. 4110 */ 4111 node = rb_first_cached(&air_sched->active_txqs); 4112 if (node) { 4113 first_txqi = container_of(node, struct txq_info, 4114 schedule_order); 4115 air_info = to_airtime_info(&first_txqi->txq); 4116 4117 if (air_sched->v_t < air_info->v_t) 4118 airtime_catchup_v_t(air_sched, air_info->v_t, now); 4119 } 4120 4121 air_info = to_airtime_info(&txqi->txq); 4122 if (air_info->v_t <= air_sched->v_t) { 4123 air_sched->last_schedule_activity = now; 4124 ret = true; 4125 } 4126 4127 out: 4128 spin_unlock_bh(&air_sched->lock); 4129 return ret; 4130 } 4131 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4132 4133 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4134 { 4135 struct ieee80211_local *local = hw_to_local(hw); 4136 struct airtime_sched_info *air_sched = &local->airtime[ac]; 4137 4138 spin_lock_bh(&air_sched->lock); 4139 air_sched->schedule_pos = NULL; 4140 spin_unlock_bh(&air_sched->lock); 4141 } 4142 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4143 4144 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4145 struct net_device *dev, 4146 u32 info_flags, 4147 u32 ctrl_flags, 4148 u64 *cookie) 4149 { 4150 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4151 struct ieee80211_local *local = sdata->local; 4152 struct sta_info *sta; 4153 struct sk_buff *next; 4154 int len = skb->len; 4155 4156 if (unlikely(skb->len < ETH_HLEN)) { 4157 kfree_skb(skb); 4158 return; 4159 } 4160 4161 rcu_read_lock(); 4162 4163 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4164 goto out_free; 4165 4166 if (IS_ERR(sta)) 4167 sta = NULL; 4168 4169 if (local->ops->wake_tx_queue) { 4170 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4171 skb_set_queue_mapping(skb, queue); 4172 skb_get_hash(skb); 4173 } 4174 4175 ieee80211_aggr_check(sdata, sta, skb); 4176 4177 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4178 4179 if (sta) { 4180 struct ieee80211_fast_tx *fast_tx; 4181 4182 fast_tx = rcu_dereference(sta->fast_tx); 4183 4184 if (fast_tx && 4185 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4186 goto out; 4187 } 4188 4189 if (skb_is_gso(skb)) { 4190 struct sk_buff *segs; 4191 4192 segs = skb_gso_segment(skb, 0); 4193 if (IS_ERR(segs)) { 4194 goto out_free; 4195 } else if (segs) { 4196 consume_skb(skb); 4197 skb = segs; 4198 } 4199 } else { 4200 /* we cannot process non-linear frames on this path */ 4201 if (skb_linearize(skb)) 4202 goto out_free; 4203 4204 /* the frame could be fragmented, software-encrypted, and other 4205 * things so we cannot really handle checksum offload with it - 4206 * fix it up in software before we handle anything else. 4207 */ 4208 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4209 skb_set_transport_header(skb, 4210 skb_checksum_start_offset(skb)); 4211 if (skb_checksum_help(skb)) 4212 goto out_free; 4213 } 4214 } 4215 4216 skb_list_walk_safe(skb, skb, next) { 4217 skb_mark_not_on_list(skb); 4218 4219 if (skb->protocol == sdata->control_port_protocol) 4220 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4221 4222 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4223 sta, ctrl_flags, cookie); 4224 if (IS_ERR(skb)) { 4225 kfree_skb_list(next); 4226 goto out; 4227 } 4228 4229 dev_sw_netstats_tx_add(dev, 1, skb->len); 4230 4231 ieee80211_xmit(sdata, sta, skb); 4232 } 4233 goto out; 4234 out_free: 4235 kfree_skb(skb); 4236 len = 0; 4237 out: 4238 if (len) 4239 ieee80211_tpt_led_trig_tx(local, len); 4240 rcu_read_unlock(); 4241 } 4242 4243 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4244 { 4245 struct ethhdr *eth; 4246 int err; 4247 4248 err = skb_ensure_writable(skb, ETH_HLEN); 4249 if (unlikely(err)) 4250 return err; 4251 4252 eth = (void *)skb->data; 4253 ether_addr_copy(eth->h_dest, sta->sta.addr); 4254 4255 return 0; 4256 } 4257 4258 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4259 struct net_device *dev) 4260 { 4261 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4262 const struct ethhdr *eth = (void *)skb->data; 4263 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4264 __be16 ethertype; 4265 4266 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4267 return false; 4268 4269 switch (sdata->vif.type) { 4270 case NL80211_IFTYPE_AP_VLAN: 4271 if (sdata->u.vlan.sta) 4272 return false; 4273 if (sdata->wdev.use_4addr) 4274 return false; 4275 fallthrough; 4276 case NL80211_IFTYPE_AP: 4277 /* check runtime toggle for this bss */ 4278 if (!sdata->bss->multicast_to_unicast) 4279 return false; 4280 break; 4281 default: 4282 return false; 4283 } 4284 4285 /* multicast to unicast conversion only for some payload */ 4286 ethertype = eth->h_proto; 4287 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4288 ethertype = ethvlan->h_vlan_encapsulated_proto; 4289 switch (ethertype) { 4290 case htons(ETH_P_ARP): 4291 case htons(ETH_P_IP): 4292 case htons(ETH_P_IPV6): 4293 break; 4294 default: 4295 return false; 4296 } 4297 4298 return true; 4299 } 4300 4301 static void 4302 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4303 struct sk_buff_head *queue) 4304 { 4305 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4306 struct ieee80211_local *local = sdata->local; 4307 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4308 struct sta_info *sta, *first = NULL; 4309 struct sk_buff *cloned_skb; 4310 4311 rcu_read_lock(); 4312 4313 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4314 if (sdata != sta->sdata) 4315 /* AP-VLAN mismatch */ 4316 continue; 4317 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4318 /* do not send back to source */ 4319 continue; 4320 if (!first) { 4321 first = sta; 4322 continue; 4323 } 4324 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4325 if (!cloned_skb) 4326 goto multicast; 4327 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4328 dev_kfree_skb(cloned_skb); 4329 goto multicast; 4330 } 4331 __skb_queue_tail(queue, cloned_skb); 4332 } 4333 4334 if (likely(first)) { 4335 if (unlikely(ieee80211_change_da(skb, first))) 4336 goto multicast; 4337 __skb_queue_tail(queue, skb); 4338 } else { 4339 /* no STA connected, drop */ 4340 kfree_skb(skb); 4341 skb = NULL; 4342 } 4343 4344 goto out; 4345 multicast: 4346 __skb_queue_purge(queue); 4347 __skb_queue_tail(queue, skb); 4348 out: 4349 rcu_read_unlock(); 4350 } 4351 4352 /** 4353 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4354 * @skb: packet to be sent 4355 * @dev: incoming interface 4356 * 4357 * On failure skb will be freed. 4358 */ 4359 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4360 struct net_device *dev) 4361 { 4362 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4363 struct sk_buff_head queue; 4364 4365 __skb_queue_head_init(&queue); 4366 ieee80211_convert_to_unicast(skb, dev, &queue); 4367 while ((skb = __skb_dequeue(&queue))) 4368 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4369 } else { 4370 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4371 } 4372 4373 return NETDEV_TX_OK; 4374 } 4375 4376 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4377 struct sk_buff *skb, struct sta_info *sta, 4378 bool txpending) 4379 { 4380 struct ieee80211_local *local = sdata->local; 4381 struct ieee80211_tx_control control = {}; 4382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4383 struct ieee80211_sta *pubsta = NULL; 4384 unsigned long flags; 4385 int q = info->hw_queue; 4386 4387 if (sta) 4388 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4389 4390 ieee80211_tpt_led_trig_tx(local, skb->len); 4391 4392 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4393 return true; 4394 4395 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4396 4397 if (local->queue_stop_reasons[q] || 4398 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4399 if (txpending) 4400 skb_queue_head(&local->pending[q], skb); 4401 else 4402 skb_queue_tail(&local->pending[q], skb); 4403 4404 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4405 4406 return false; 4407 } 4408 4409 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4410 4411 if (sta && sta->uploaded) 4412 pubsta = &sta->sta; 4413 4414 control.sta = pubsta; 4415 4416 drv_tx(local, &control, skb); 4417 4418 return true; 4419 } 4420 4421 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4422 struct net_device *dev, struct sta_info *sta, 4423 struct ieee80211_key *key, struct sk_buff *skb) 4424 { 4425 struct ieee80211_tx_info *info; 4426 struct ieee80211_local *local = sdata->local; 4427 struct tid_ampdu_tx *tid_tx; 4428 u8 tid; 4429 4430 if (local->ops->wake_tx_queue) { 4431 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4432 skb_set_queue_mapping(skb, queue); 4433 skb_get_hash(skb); 4434 } 4435 4436 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4437 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4438 goto out_free; 4439 4440 skb = skb_share_check(skb, GFP_ATOMIC); 4441 if (unlikely(!skb)) 4442 return; 4443 4444 info = IEEE80211_SKB_CB(skb); 4445 memset(info, 0, sizeof(*info)); 4446 4447 ieee80211_aggr_check(sdata, sta, skb); 4448 4449 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4450 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4451 if (tid_tx) { 4452 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4453 /* fall back to non-offload slow path */ 4454 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4455 return; 4456 } 4457 4458 info->flags |= IEEE80211_TX_CTL_AMPDU; 4459 if (tid_tx->timeout) 4460 tid_tx->last_tx = jiffies; 4461 } 4462 4463 if (unlikely(skb->sk && 4464 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4465 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4466 &info->flags, NULL); 4467 4468 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4469 4470 dev_sw_netstats_tx_add(dev, 1, skb->len); 4471 4472 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4473 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 4474 4475 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4476 sdata = container_of(sdata->bss, 4477 struct ieee80211_sub_if_data, u.ap); 4478 4479 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4480 info->control.vif = &sdata->vif; 4481 4482 if (key) 4483 info->control.hw_key = &key->conf; 4484 4485 ieee80211_tx_8023(sdata, skb, sta, false); 4486 4487 return; 4488 4489 out_free: 4490 kfree_skb(skb); 4491 } 4492 4493 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4494 struct net_device *dev) 4495 { 4496 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4497 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4498 struct ieee80211_key *key; 4499 struct sta_info *sta; 4500 4501 if (unlikely(skb->len < ETH_HLEN)) { 4502 kfree_skb(skb); 4503 return NETDEV_TX_OK; 4504 } 4505 4506 rcu_read_lock(); 4507 4508 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4509 kfree_skb(skb); 4510 goto out; 4511 } 4512 4513 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4514 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4515 sdata->control_port_protocol == ehdr->h_proto)) 4516 goto skip_offload; 4517 4518 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4519 if (!key) 4520 key = rcu_dereference(sdata->default_unicast_key); 4521 4522 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4523 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4524 goto skip_offload; 4525 4526 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4527 goto out; 4528 4529 skip_offload: 4530 ieee80211_subif_start_xmit(skb, dev); 4531 out: 4532 rcu_read_unlock(); 4533 4534 return NETDEV_TX_OK; 4535 } 4536 4537 struct sk_buff * 4538 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4539 struct sk_buff *skb, u32 info_flags) 4540 { 4541 struct ieee80211_hdr *hdr; 4542 struct ieee80211_tx_data tx = { 4543 .local = sdata->local, 4544 .sdata = sdata, 4545 }; 4546 struct sta_info *sta; 4547 4548 rcu_read_lock(); 4549 4550 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4551 kfree_skb(skb); 4552 skb = ERR_PTR(-EINVAL); 4553 goto out; 4554 } 4555 4556 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4557 if (IS_ERR(skb)) 4558 goto out; 4559 4560 hdr = (void *)skb->data; 4561 tx.sta = sta_info_get(sdata, hdr->addr1); 4562 tx.skb = skb; 4563 4564 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4565 rcu_read_unlock(); 4566 kfree_skb(skb); 4567 return ERR_PTR(-EINVAL); 4568 } 4569 4570 out: 4571 rcu_read_unlock(); 4572 return skb; 4573 } 4574 4575 /* 4576 * ieee80211_clear_tx_pending may not be called in a context where 4577 * it is possible that it packets could come in again. 4578 */ 4579 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4580 { 4581 struct sk_buff *skb; 4582 int i; 4583 4584 for (i = 0; i < local->hw.queues; i++) { 4585 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4586 ieee80211_free_txskb(&local->hw, skb); 4587 } 4588 } 4589 4590 /* 4591 * Returns false if the frame couldn't be transmitted but was queued instead, 4592 * which in this case means re-queued -- take as an indication to stop sending 4593 * more pending frames. 4594 */ 4595 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4596 struct sk_buff *skb) 4597 { 4598 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4599 struct ieee80211_sub_if_data *sdata; 4600 struct sta_info *sta; 4601 struct ieee80211_hdr *hdr; 4602 bool result; 4603 struct ieee80211_chanctx_conf *chanctx_conf; 4604 4605 sdata = vif_to_sdata(info->control.vif); 4606 4607 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4608 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4609 if (unlikely(!chanctx_conf)) { 4610 dev_kfree_skb(skb); 4611 return true; 4612 } 4613 info->band = chanctx_conf->def.chan->band; 4614 result = ieee80211_tx(sdata, NULL, skb, true); 4615 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4616 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4617 dev_kfree_skb(skb); 4618 return true; 4619 } 4620 4621 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4622 sta = NULL; 4623 4624 result = ieee80211_tx_8023(sdata, skb, sta, true); 4625 } else { 4626 struct sk_buff_head skbs; 4627 4628 __skb_queue_head_init(&skbs); 4629 __skb_queue_tail(&skbs, skb); 4630 4631 hdr = (struct ieee80211_hdr *)skb->data; 4632 sta = sta_info_get(sdata, hdr->addr1); 4633 4634 result = __ieee80211_tx(local, &skbs, sta, true); 4635 } 4636 4637 return result; 4638 } 4639 4640 /* 4641 * Transmit all pending packets. Called from tasklet. 4642 */ 4643 void ieee80211_tx_pending(struct tasklet_struct *t) 4644 { 4645 struct ieee80211_local *local = from_tasklet(local, t, 4646 tx_pending_tasklet); 4647 unsigned long flags; 4648 int i; 4649 bool txok; 4650 4651 rcu_read_lock(); 4652 4653 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4654 for (i = 0; i < local->hw.queues; i++) { 4655 /* 4656 * If queue is stopped by something other than due to pending 4657 * frames, or we have no pending frames, proceed to next queue. 4658 */ 4659 if (local->queue_stop_reasons[i] || 4660 skb_queue_empty(&local->pending[i])) 4661 continue; 4662 4663 while (!skb_queue_empty(&local->pending[i])) { 4664 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4665 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4666 4667 if (WARN_ON(!info->control.vif)) { 4668 ieee80211_free_txskb(&local->hw, skb); 4669 continue; 4670 } 4671 4672 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4673 flags); 4674 4675 txok = ieee80211_tx_pending_skb(local, skb); 4676 spin_lock_irqsave(&local->queue_stop_reason_lock, 4677 flags); 4678 if (!txok) 4679 break; 4680 } 4681 4682 if (skb_queue_empty(&local->pending[i])) 4683 ieee80211_propagate_queue_wake(local, i); 4684 } 4685 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4686 4687 rcu_read_unlock(); 4688 } 4689 4690 /* functions for drivers to get certain frames */ 4691 4692 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4693 struct ps_data *ps, struct sk_buff *skb, 4694 bool is_template) 4695 { 4696 u8 *pos, *tim; 4697 int aid0 = 0; 4698 int i, have_bits = 0, n1, n2; 4699 4700 /* Generate bitmap for TIM only if there are any STAs in power save 4701 * mode. */ 4702 if (atomic_read(&ps->num_sta_ps) > 0) 4703 /* in the hope that this is faster than 4704 * checking byte-for-byte */ 4705 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4706 IEEE80211_MAX_AID+1); 4707 if (!is_template) { 4708 if (ps->dtim_count == 0) 4709 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4710 else 4711 ps->dtim_count--; 4712 } 4713 4714 tim = pos = skb_put(skb, 6); 4715 *pos++ = WLAN_EID_TIM; 4716 *pos++ = 4; 4717 *pos++ = ps->dtim_count; 4718 *pos++ = sdata->vif.bss_conf.dtim_period; 4719 4720 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4721 aid0 = 1; 4722 4723 ps->dtim_bc_mc = aid0 == 1; 4724 4725 if (have_bits) { 4726 /* Find largest even number N1 so that bits numbered 1 through 4727 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4728 * (N2 + 1) x 8 through 2007 are 0. */ 4729 n1 = 0; 4730 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4731 if (ps->tim[i]) { 4732 n1 = i & 0xfe; 4733 break; 4734 } 4735 } 4736 n2 = n1; 4737 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4738 if (ps->tim[i]) { 4739 n2 = i; 4740 break; 4741 } 4742 } 4743 4744 /* Bitmap control */ 4745 *pos++ = n1 | aid0; 4746 /* Part Virt Bitmap */ 4747 skb_put(skb, n2 - n1); 4748 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4749 4750 tim[1] = n2 - n1 + 4; 4751 } else { 4752 *pos++ = aid0; /* Bitmap control */ 4753 *pos++ = 0; /* Part Virt Bitmap */ 4754 } 4755 } 4756 4757 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4758 struct ps_data *ps, struct sk_buff *skb, 4759 bool is_template) 4760 { 4761 struct ieee80211_local *local = sdata->local; 4762 4763 /* 4764 * Not very nice, but we want to allow the driver to call 4765 * ieee80211_beacon_get() as a response to the set_tim() 4766 * callback. That, however, is already invoked under the 4767 * sta_lock to guarantee consistent and race-free update 4768 * of the tim bitmap in mac80211 and the driver. 4769 */ 4770 if (local->tim_in_locked_section) { 4771 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4772 } else { 4773 spin_lock_bh(&local->tim_lock); 4774 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4775 spin_unlock_bh(&local->tim_lock); 4776 } 4777 4778 return 0; 4779 } 4780 4781 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4782 struct beacon_data *beacon) 4783 { 4784 u8 *beacon_data, count, max_count = 1; 4785 struct probe_resp *resp; 4786 size_t beacon_data_len; 4787 u16 *bcn_offsets; 4788 int i; 4789 4790 switch (sdata->vif.type) { 4791 case NL80211_IFTYPE_AP: 4792 beacon_data = beacon->tail; 4793 beacon_data_len = beacon->tail_len; 4794 break; 4795 case NL80211_IFTYPE_ADHOC: 4796 beacon_data = beacon->head; 4797 beacon_data_len = beacon->head_len; 4798 break; 4799 case NL80211_IFTYPE_MESH_POINT: 4800 beacon_data = beacon->head; 4801 beacon_data_len = beacon->head_len; 4802 break; 4803 default: 4804 return; 4805 } 4806 4807 rcu_read_lock(); 4808 resp = rcu_dereference(sdata->u.ap.probe_resp); 4809 4810 bcn_offsets = beacon->cntdwn_counter_offsets; 4811 count = beacon->cntdwn_current_counter; 4812 if (sdata->vif.csa_active) 4813 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4814 4815 for (i = 0; i < max_count; ++i) { 4816 if (bcn_offsets[i]) { 4817 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) { 4818 rcu_read_unlock(); 4819 return; 4820 } 4821 beacon_data[bcn_offsets[i]] = count; 4822 } 4823 4824 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4825 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4826 4827 resp->data[resp_offsets[i]] = count; 4828 } 4829 } 4830 rcu_read_unlock(); 4831 } 4832 4833 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4834 { 4835 beacon->cntdwn_current_counter--; 4836 4837 /* the counter should never reach 0 */ 4838 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4839 4840 return beacon->cntdwn_current_counter; 4841 } 4842 4843 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4844 { 4845 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4846 struct beacon_data *beacon = NULL; 4847 u8 count = 0; 4848 4849 rcu_read_lock(); 4850 4851 if (sdata->vif.type == NL80211_IFTYPE_AP) 4852 beacon = rcu_dereference(sdata->u.ap.beacon); 4853 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4854 beacon = rcu_dereference(sdata->u.ibss.presp); 4855 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4856 beacon = rcu_dereference(sdata->u.mesh.beacon); 4857 4858 if (!beacon) 4859 goto unlock; 4860 4861 count = __ieee80211_beacon_update_cntdwn(beacon); 4862 4863 unlock: 4864 rcu_read_unlock(); 4865 return count; 4866 } 4867 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4868 4869 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4870 { 4871 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4872 struct beacon_data *beacon = NULL; 4873 4874 rcu_read_lock(); 4875 4876 if (sdata->vif.type == NL80211_IFTYPE_AP) 4877 beacon = rcu_dereference(sdata->u.ap.beacon); 4878 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4879 beacon = rcu_dereference(sdata->u.ibss.presp); 4880 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4881 beacon = rcu_dereference(sdata->u.mesh.beacon); 4882 4883 if (!beacon) 4884 goto unlock; 4885 4886 if (counter < beacon->cntdwn_current_counter) 4887 beacon->cntdwn_current_counter = counter; 4888 4889 unlock: 4890 rcu_read_unlock(); 4891 } 4892 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4893 4894 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4895 { 4896 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4897 struct beacon_data *beacon = NULL; 4898 u8 *beacon_data; 4899 size_t beacon_data_len; 4900 int ret = false; 4901 4902 if (!ieee80211_sdata_running(sdata)) 4903 return false; 4904 4905 rcu_read_lock(); 4906 if (vif->type == NL80211_IFTYPE_AP) { 4907 struct ieee80211_if_ap *ap = &sdata->u.ap; 4908 4909 beacon = rcu_dereference(ap->beacon); 4910 if (WARN_ON(!beacon || !beacon->tail)) 4911 goto out; 4912 beacon_data = beacon->tail; 4913 beacon_data_len = beacon->tail_len; 4914 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4915 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4916 4917 beacon = rcu_dereference(ifibss->presp); 4918 if (!beacon) 4919 goto out; 4920 4921 beacon_data = beacon->head; 4922 beacon_data_len = beacon->head_len; 4923 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4924 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4925 4926 beacon = rcu_dereference(ifmsh->beacon); 4927 if (!beacon) 4928 goto out; 4929 4930 beacon_data = beacon->head; 4931 beacon_data_len = beacon->head_len; 4932 } else { 4933 WARN_ON(1); 4934 goto out; 4935 } 4936 4937 if (!beacon->cntdwn_counter_offsets[0]) 4938 goto out; 4939 4940 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4941 goto out; 4942 4943 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4944 ret = true; 4945 4946 out: 4947 rcu_read_unlock(); 4948 4949 return ret; 4950 } 4951 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4952 4953 static int ieee80211_beacon_protect(struct sk_buff *skb, 4954 struct ieee80211_local *local, 4955 struct ieee80211_sub_if_data *sdata) 4956 { 4957 ieee80211_tx_result res; 4958 struct ieee80211_tx_data tx; 4959 struct sk_buff *check_skb; 4960 4961 memset(&tx, 0, sizeof(tx)); 4962 tx.key = rcu_dereference(sdata->default_beacon_key); 4963 if (!tx.key) 4964 return 0; 4965 tx.local = local; 4966 tx.sdata = sdata; 4967 __skb_queue_head_init(&tx.skbs); 4968 __skb_queue_tail(&tx.skbs, skb); 4969 res = ieee80211_tx_h_encrypt(&tx); 4970 check_skb = __skb_dequeue(&tx.skbs); 4971 /* we may crash after this, but it'd be a bug in crypto */ 4972 WARN_ON(check_skb != skb); 4973 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4974 return -EINVAL; 4975 4976 return 0; 4977 } 4978 4979 static void 4980 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 4981 struct ieee80211_vif *vif, 4982 struct ieee80211_mutable_offsets *offs, 4983 struct beacon_data *beacon, 4984 struct sk_buff *skb, 4985 struct ieee80211_chanctx_conf *chanctx_conf, 4986 u16 csa_off_base) 4987 { 4988 struct ieee80211_local *local = hw_to_local(hw); 4989 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4990 struct ieee80211_tx_info *info; 4991 enum nl80211_band band; 4992 struct ieee80211_tx_rate_control txrc; 4993 4994 /* CSA offsets */ 4995 if (offs && beacon) { 4996 u16 i; 4997 4998 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4999 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5000 5001 if (!csa_off) 5002 continue; 5003 5004 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5005 } 5006 } 5007 5008 band = chanctx_conf->def.chan->band; 5009 info = IEEE80211_SKB_CB(skb); 5010 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5011 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5012 info->band = band; 5013 5014 memset(&txrc, 0, sizeof(txrc)); 5015 txrc.hw = hw; 5016 txrc.sband = local->hw.wiphy->bands[band]; 5017 txrc.bss_conf = &sdata->vif.bss_conf; 5018 txrc.skb = skb; 5019 txrc.reported_rate.idx = -1; 5020 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5021 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5022 else 5023 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5024 txrc.bss = true; 5025 rate_control_get_rate(sdata, NULL, &txrc); 5026 5027 info->control.vif = vif; 5028 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5029 IEEE80211_TX_CTL_ASSIGN_SEQ | 5030 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5031 } 5032 5033 static void 5034 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon) 5035 { 5036 int i; 5037 5038 if (!beacon->mbssid_ies) 5039 return; 5040 5041 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5042 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5043 beacon->mbssid_ies->elem[i].len); 5044 } 5045 5046 static struct sk_buff * 5047 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5048 struct ieee80211_vif *vif, 5049 struct ieee80211_mutable_offsets *offs, 5050 bool is_template, 5051 struct beacon_data *beacon, 5052 struct ieee80211_chanctx_conf *chanctx_conf) 5053 { 5054 struct ieee80211_local *local = hw_to_local(hw); 5055 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5056 struct ieee80211_if_ap *ap = &sdata->u.ap; 5057 struct sk_buff *skb = NULL; 5058 u16 csa_off_base = 0; 5059 int mbssid_len; 5060 5061 if (beacon->cntdwn_counter_offsets[0]) { 5062 if (!is_template) 5063 ieee80211_beacon_update_cntdwn(vif); 5064 5065 ieee80211_set_beacon_cntdwn(sdata, beacon); 5066 } 5067 5068 /* headroom, head length, 5069 * tail length, maximum TIM length and multiple BSSID length 5070 */ 5071 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies); 5072 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5073 beacon->tail_len + 256 + 5074 local->hw.extra_beacon_tailroom + mbssid_len); 5075 if (!skb) 5076 return NULL; 5077 5078 skb_reserve(skb, local->tx_headroom); 5079 skb_put_data(skb, beacon->head, beacon->head_len); 5080 5081 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, is_template); 5082 5083 if (offs) { 5084 offs->tim_offset = beacon->head_len; 5085 offs->tim_length = skb->len - beacon->head_len; 5086 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5087 5088 if (mbssid_len) { 5089 ieee80211_beacon_add_mbssid(skb, beacon); 5090 offs->mbssid_off = skb->len - mbssid_len; 5091 } 5092 5093 /* for AP the csa offsets are from tail */ 5094 csa_off_base = skb->len; 5095 } 5096 5097 if (beacon->tail) 5098 skb_put_data(skb, beacon->tail, beacon->tail_len); 5099 5100 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 5101 return NULL; 5102 5103 ieee80211_beacon_get_finish(hw, vif, offs, beacon, skb, chanctx_conf, 5104 csa_off_base); 5105 return skb; 5106 } 5107 5108 static struct sk_buff * 5109 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5110 struct ieee80211_vif *vif, 5111 struct ieee80211_mutable_offsets *offs, 5112 bool is_template) 5113 { 5114 struct ieee80211_local *local = hw_to_local(hw); 5115 struct beacon_data *beacon = NULL; 5116 struct sk_buff *skb = NULL; 5117 struct ieee80211_sub_if_data *sdata = NULL; 5118 struct ieee80211_chanctx_conf *chanctx_conf; 5119 5120 rcu_read_lock(); 5121 5122 sdata = vif_to_sdata(vif); 5123 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5124 5125 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5126 goto out; 5127 5128 if (offs) 5129 memset(offs, 0, sizeof(*offs)); 5130 5131 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5132 struct ieee80211_if_ap *ap = &sdata->u.ap; 5133 5134 beacon = rcu_dereference(ap->beacon); 5135 if (!beacon) 5136 goto out; 5137 5138 skb = ieee80211_beacon_get_ap(hw, vif, offs, is_template, 5139 beacon, chanctx_conf); 5140 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5141 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5142 struct ieee80211_hdr *hdr; 5143 5144 beacon = rcu_dereference(ifibss->presp); 5145 if (!beacon) 5146 goto out; 5147 5148 if (beacon->cntdwn_counter_offsets[0]) { 5149 if (!is_template) 5150 __ieee80211_beacon_update_cntdwn(beacon); 5151 5152 ieee80211_set_beacon_cntdwn(sdata, beacon); 5153 } 5154 5155 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5156 local->hw.extra_beacon_tailroom); 5157 if (!skb) 5158 goto out; 5159 skb_reserve(skb, local->tx_headroom); 5160 skb_put_data(skb, beacon->head, beacon->head_len); 5161 5162 hdr = (struct ieee80211_hdr *) skb->data; 5163 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5164 IEEE80211_STYPE_BEACON); 5165 5166 ieee80211_beacon_get_finish(hw, vif, offs, beacon, skb, 5167 chanctx_conf, 0); 5168 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5169 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5170 5171 beacon = rcu_dereference(ifmsh->beacon); 5172 if (!beacon) 5173 goto out; 5174 5175 if (beacon->cntdwn_counter_offsets[0]) { 5176 if (!is_template) 5177 /* TODO: For mesh csa_counter is in TU, so 5178 * decrementing it by one isn't correct, but 5179 * for now we leave it consistent with overall 5180 * mac80211's behavior. 5181 */ 5182 __ieee80211_beacon_update_cntdwn(beacon); 5183 5184 ieee80211_set_beacon_cntdwn(sdata, beacon); 5185 } 5186 5187 if (ifmsh->sync_ops) 5188 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5189 5190 skb = dev_alloc_skb(local->tx_headroom + 5191 beacon->head_len + 5192 256 + /* TIM IE */ 5193 beacon->tail_len + 5194 local->hw.extra_beacon_tailroom); 5195 if (!skb) 5196 goto out; 5197 skb_reserve(skb, local->tx_headroom); 5198 skb_put_data(skb, beacon->head, beacon->head_len); 5199 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 5200 5201 if (offs) { 5202 offs->tim_offset = beacon->head_len; 5203 offs->tim_length = skb->len - beacon->head_len; 5204 } 5205 5206 skb_put_data(skb, beacon->tail, beacon->tail_len); 5207 ieee80211_beacon_get_finish(hw, vif, offs, beacon, skb, 5208 chanctx_conf, 0); 5209 } else { 5210 WARN_ON(1); 5211 goto out; 5212 } 5213 5214 out: 5215 rcu_read_unlock(); 5216 return skb; 5217 5218 } 5219 5220 struct sk_buff * 5221 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5222 struct ieee80211_vif *vif, 5223 struct ieee80211_mutable_offsets *offs) 5224 { 5225 return __ieee80211_beacon_get(hw, vif, offs, true); 5226 } 5227 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5228 5229 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5230 struct ieee80211_vif *vif, 5231 u16 *tim_offset, u16 *tim_length) 5232 { 5233 struct ieee80211_mutable_offsets offs = {}; 5234 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 5235 struct sk_buff *copy; 5236 struct ieee80211_supported_band *sband; 5237 int shift; 5238 5239 if (!bcn) 5240 return bcn; 5241 5242 if (tim_offset) 5243 *tim_offset = offs.tim_offset; 5244 5245 if (tim_length) 5246 *tim_length = offs.tim_length; 5247 5248 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5249 !hw_to_local(hw)->monitors) 5250 return bcn; 5251 5252 /* send a copy to monitor interfaces */ 5253 copy = skb_copy(bcn, GFP_ATOMIC); 5254 if (!copy) 5255 return bcn; 5256 5257 shift = ieee80211_vif_get_shift(vif); 5258 sband = ieee80211_get_sband(vif_to_sdata(vif)); 5259 if (!sband) 5260 return bcn; 5261 5262 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 5263 NULL); 5264 5265 return bcn; 5266 } 5267 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5268 5269 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5270 struct ieee80211_vif *vif) 5271 { 5272 struct ieee80211_if_ap *ap = NULL; 5273 struct sk_buff *skb = NULL; 5274 struct probe_resp *presp = NULL; 5275 struct ieee80211_hdr *hdr; 5276 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5277 5278 if (sdata->vif.type != NL80211_IFTYPE_AP) 5279 return NULL; 5280 5281 rcu_read_lock(); 5282 5283 ap = &sdata->u.ap; 5284 presp = rcu_dereference(ap->probe_resp); 5285 if (!presp) 5286 goto out; 5287 5288 skb = dev_alloc_skb(presp->len); 5289 if (!skb) 5290 goto out; 5291 5292 skb_put_data(skb, presp->data, presp->len); 5293 5294 hdr = (struct ieee80211_hdr *) skb->data; 5295 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5296 5297 out: 5298 rcu_read_unlock(); 5299 return skb; 5300 } 5301 EXPORT_SYMBOL(ieee80211_proberesp_get); 5302 5303 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5304 struct ieee80211_vif *vif) 5305 { 5306 struct sk_buff *skb = NULL; 5307 struct fils_discovery_data *tmpl = NULL; 5308 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5309 5310 if (sdata->vif.type != NL80211_IFTYPE_AP) 5311 return NULL; 5312 5313 rcu_read_lock(); 5314 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5315 if (!tmpl) { 5316 rcu_read_unlock(); 5317 return NULL; 5318 } 5319 5320 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5321 if (skb) { 5322 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5323 skb_put_data(skb, tmpl->data, tmpl->len); 5324 } 5325 5326 rcu_read_unlock(); 5327 return skb; 5328 } 5329 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5330 5331 struct sk_buff * 5332 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5333 struct ieee80211_vif *vif) 5334 { 5335 struct sk_buff *skb = NULL; 5336 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5337 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5338 5339 if (sdata->vif.type != NL80211_IFTYPE_AP) 5340 return NULL; 5341 5342 rcu_read_lock(); 5343 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5344 if (!tmpl) { 5345 rcu_read_unlock(); 5346 return NULL; 5347 } 5348 5349 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5350 if (skb) { 5351 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5352 skb_put_data(skb, tmpl->data, tmpl->len); 5353 } 5354 5355 rcu_read_unlock(); 5356 return skb; 5357 } 5358 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5359 5360 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5361 struct ieee80211_vif *vif) 5362 { 5363 struct ieee80211_sub_if_data *sdata; 5364 struct ieee80211_if_managed *ifmgd; 5365 struct ieee80211_pspoll *pspoll; 5366 struct ieee80211_local *local; 5367 struct sk_buff *skb; 5368 5369 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5370 return NULL; 5371 5372 sdata = vif_to_sdata(vif); 5373 ifmgd = &sdata->u.mgd; 5374 local = sdata->local; 5375 5376 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5377 if (!skb) 5378 return NULL; 5379 5380 skb_reserve(skb, local->hw.extra_tx_headroom); 5381 5382 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5383 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5384 IEEE80211_STYPE_PSPOLL); 5385 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5386 5387 /* aid in PS-Poll has its two MSBs each set to 1 */ 5388 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5389 5390 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5391 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5392 5393 return skb; 5394 } 5395 EXPORT_SYMBOL(ieee80211_pspoll_get); 5396 5397 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5398 struct ieee80211_vif *vif, 5399 bool qos_ok) 5400 { 5401 struct ieee80211_hdr_3addr *nullfunc; 5402 struct ieee80211_sub_if_data *sdata; 5403 struct ieee80211_if_managed *ifmgd; 5404 struct ieee80211_local *local; 5405 struct sk_buff *skb; 5406 bool qos = false; 5407 5408 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5409 return NULL; 5410 5411 sdata = vif_to_sdata(vif); 5412 ifmgd = &sdata->u.mgd; 5413 local = sdata->local; 5414 5415 if (qos_ok) { 5416 struct sta_info *sta; 5417 5418 rcu_read_lock(); 5419 sta = sta_info_get(sdata, ifmgd->bssid); 5420 qos = sta && sta->sta.wme; 5421 rcu_read_unlock(); 5422 } 5423 5424 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5425 sizeof(*nullfunc) + 2); 5426 if (!skb) 5427 return NULL; 5428 5429 skb_reserve(skb, local->hw.extra_tx_headroom); 5430 5431 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5432 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5433 IEEE80211_STYPE_NULLFUNC | 5434 IEEE80211_FCTL_TODS); 5435 if (qos) { 5436 __le16 qoshdr = cpu_to_le16(7); 5437 5438 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5439 IEEE80211_STYPE_NULLFUNC) != 5440 IEEE80211_STYPE_QOS_NULLFUNC); 5441 nullfunc->frame_control |= 5442 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5443 skb->priority = 7; 5444 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5445 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5446 } 5447 5448 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5449 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5450 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5451 5452 return skb; 5453 } 5454 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5455 5456 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5457 const u8 *src_addr, 5458 const u8 *ssid, size_t ssid_len, 5459 size_t tailroom) 5460 { 5461 struct ieee80211_local *local = hw_to_local(hw); 5462 struct ieee80211_hdr_3addr *hdr; 5463 struct sk_buff *skb; 5464 size_t ie_ssid_len; 5465 u8 *pos; 5466 5467 ie_ssid_len = 2 + ssid_len; 5468 5469 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5470 ie_ssid_len + tailroom); 5471 if (!skb) 5472 return NULL; 5473 5474 skb_reserve(skb, local->hw.extra_tx_headroom); 5475 5476 hdr = skb_put_zero(skb, sizeof(*hdr)); 5477 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5478 IEEE80211_STYPE_PROBE_REQ); 5479 eth_broadcast_addr(hdr->addr1); 5480 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5481 eth_broadcast_addr(hdr->addr3); 5482 5483 pos = skb_put(skb, ie_ssid_len); 5484 *pos++ = WLAN_EID_SSID; 5485 *pos++ = ssid_len; 5486 if (ssid_len) 5487 memcpy(pos, ssid, ssid_len); 5488 pos += ssid_len; 5489 5490 return skb; 5491 } 5492 EXPORT_SYMBOL(ieee80211_probereq_get); 5493 5494 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5495 const void *frame, size_t frame_len, 5496 const struct ieee80211_tx_info *frame_txctl, 5497 struct ieee80211_rts *rts) 5498 { 5499 const struct ieee80211_hdr *hdr = frame; 5500 5501 rts->frame_control = 5502 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5503 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5504 frame_txctl); 5505 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5506 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5507 } 5508 EXPORT_SYMBOL(ieee80211_rts_get); 5509 5510 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5511 const void *frame, size_t frame_len, 5512 const struct ieee80211_tx_info *frame_txctl, 5513 struct ieee80211_cts *cts) 5514 { 5515 const struct ieee80211_hdr *hdr = frame; 5516 5517 cts->frame_control = 5518 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5519 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5520 frame_len, frame_txctl); 5521 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5522 } 5523 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5524 5525 struct sk_buff * 5526 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5527 struct ieee80211_vif *vif) 5528 { 5529 struct ieee80211_local *local = hw_to_local(hw); 5530 struct sk_buff *skb = NULL; 5531 struct ieee80211_tx_data tx; 5532 struct ieee80211_sub_if_data *sdata; 5533 struct ps_data *ps; 5534 struct ieee80211_tx_info *info; 5535 struct ieee80211_chanctx_conf *chanctx_conf; 5536 5537 sdata = vif_to_sdata(vif); 5538 5539 rcu_read_lock(); 5540 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5541 5542 if (!chanctx_conf) 5543 goto out; 5544 5545 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5546 struct beacon_data *beacon = 5547 rcu_dereference(sdata->u.ap.beacon); 5548 5549 if (!beacon || !beacon->head) 5550 goto out; 5551 5552 ps = &sdata->u.ap.ps; 5553 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5554 ps = &sdata->u.mesh.ps; 5555 } else { 5556 goto out; 5557 } 5558 5559 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5560 goto out; /* send buffered bc/mc only after DTIM beacon */ 5561 5562 while (1) { 5563 skb = skb_dequeue(&ps->bc_buf); 5564 if (!skb) 5565 goto out; 5566 local->total_ps_buffered--; 5567 5568 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5569 struct ieee80211_hdr *hdr = 5570 (struct ieee80211_hdr *) skb->data; 5571 /* more buffered multicast/broadcast frames ==> set 5572 * MoreData flag in IEEE 802.11 header to inform PS 5573 * STAs */ 5574 hdr->frame_control |= 5575 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5576 } 5577 5578 if (sdata->vif.type == NL80211_IFTYPE_AP) 5579 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5580 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5581 break; 5582 ieee80211_free_txskb(hw, skb); 5583 } 5584 5585 info = IEEE80211_SKB_CB(skb); 5586 5587 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5588 info->band = chanctx_conf->def.chan->band; 5589 5590 if (invoke_tx_handlers(&tx)) 5591 skb = NULL; 5592 out: 5593 rcu_read_unlock(); 5594 5595 return skb; 5596 } 5597 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5598 5599 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5600 { 5601 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5602 struct ieee80211_sub_if_data *sdata = sta->sdata; 5603 struct ieee80211_local *local = sdata->local; 5604 int ret; 5605 u32 queues; 5606 5607 lockdep_assert_held(&local->sta_mtx); 5608 5609 /* only some cases are supported right now */ 5610 switch (sdata->vif.type) { 5611 case NL80211_IFTYPE_STATION: 5612 case NL80211_IFTYPE_AP: 5613 case NL80211_IFTYPE_AP_VLAN: 5614 break; 5615 default: 5616 WARN_ON(1); 5617 return -EINVAL; 5618 } 5619 5620 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5621 return -EINVAL; 5622 5623 if (sta->reserved_tid == tid) { 5624 ret = 0; 5625 goto out; 5626 } 5627 5628 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5629 sdata_err(sdata, "TID reservation already active\n"); 5630 ret = -EALREADY; 5631 goto out; 5632 } 5633 5634 ieee80211_stop_vif_queues(sdata->local, sdata, 5635 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5636 5637 synchronize_net(); 5638 5639 /* Tear down BA sessions so we stop aggregating on this TID */ 5640 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5641 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5642 __ieee80211_stop_tx_ba_session(sta, tid, 5643 AGG_STOP_LOCAL_REQUEST); 5644 } 5645 5646 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5647 __ieee80211_flush_queues(local, sdata, queues, false); 5648 5649 sta->reserved_tid = tid; 5650 5651 ieee80211_wake_vif_queues(local, sdata, 5652 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5653 5654 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5655 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5656 5657 ret = 0; 5658 out: 5659 return ret; 5660 } 5661 EXPORT_SYMBOL(ieee80211_reserve_tid); 5662 5663 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5664 { 5665 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5666 struct ieee80211_sub_if_data *sdata = sta->sdata; 5667 5668 lockdep_assert_held(&sdata->local->sta_mtx); 5669 5670 /* only some cases are supported right now */ 5671 switch (sdata->vif.type) { 5672 case NL80211_IFTYPE_STATION: 5673 case NL80211_IFTYPE_AP: 5674 case NL80211_IFTYPE_AP_VLAN: 5675 break; 5676 default: 5677 WARN_ON(1); 5678 return; 5679 } 5680 5681 if (tid != sta->reserved_tid) { 5682 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5683 return; 5684 } 5685 5686 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5687 } 5688 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5689 5690 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5691 struct sk_buff *skb, int tid, 5692 enum nl80211_band band) 5693 { 5694 int ac = ieee80211_ac_from_tid(tid); 5695 5696 skb_reset_mac_header(skb); 5697 skb_set_queue_mapping(skb, ac); 5698 skb->priority = tid; 5699 5700 skb->dev = sdata->dev; 5701 5702 /* 5703 * The other path calling ieee80211_xmit is from the tasklet, 5704 * and while we can handle concurrent transmissions locking 5705 * requirements are that we do not come into tx with bhs on. 5706 */ 5707 local_bh_disable(); 5708 IEEE80211_SKB_CB(skb)->band = band; 5709 ieee80211_xmit(sdata, NULL, skb); 5710 local_bh_enable(); 5711 } 5712 5713 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5714 const u8 *buf, size_t len, 5715 const u8 *dest, __be16 proto, bool unencrypted, 5716 u64 *cookie) 5717 { 5718 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5719 struct ieee80211_local *local = sdata->local; 5720 struct sta_info *sta; 5721 struct sk_buff *skb; 5722 struct ethhdr *ehdr; 5723 u32 ctrl_flags = 0; 5724 u32 flags = 0; 5725 5726 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5727 * or Pre-Authentication 5728 */ 5729 if (proto != sdata->control_port_protocol && 5730 proto != cpu_to_be16(ETH_P_PREAUTH)) 5731 return -EINVAL; 5732 5733 if (proto == sdata->control_port_protocol) 5734 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5735 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5736 5737 if (unencrypted) 5738 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5739 5740 if (cookie) 5741 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5742 5743 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5744 5745 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5746 sizeof(struct ethhdr) + len); 5747 if (!skb) 5748 return -ENOMEM; 5749 5750 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5751 5752 skb_put_data(skb, buf, len); 5753 5754 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5755 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5756 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5757 ehdr->h_proto = proto; 5758 5759 skb->dev = dev; 5760 skb->protocol = proto; 5761 skb_reset_network_header(skb); 5762 skb_reset_mac_header(skb); 5763 5764 /* update QoS header to prioritize control port frames if possible, 5765 * priorization also happens for control port frames send over 5766 * AF_PACKET 5767 */ 5768 rcu_read_lock(); 5769 5770 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5771 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5772 5773 skb_set_queue_mapping(skb, queue); 5774 skb_get_hash(skb); 5775 } 5776 5777 rcu_read_unlock(); 5778 5779 /* mutex lock is only needed for incrementing the cookie counter */ 5780 mutex_lock(&local->mtx); 5781 5782 local_bh_disable(); 5783 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5784 local_bh_enable(); 5785 5786 mutex_unlock(&local->mtx); 5787 5788 return 0; 5789 } 5790 5791 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5792 const u8 *buf, size_t len) 5793 { 5794 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5795 struct ieee80211_local *local = sdata->local; 5796 struct sk_buff *skb; 5797 5798 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5799 30 + /* header size */ 5800 18); /* 11s header size */ 5801 if (!skb) 5802 return -ENOMEM; 5803 5804 skb_reserve(skb, local->hw.extra_tx_headroom); 5805 skb_put_data(skb, buf, len); 5806 5807 skb->dev = dev; 5808 skb->protocol = htons(ETH_P_802_3); 5809 skb_reset_network_header(skb); 5810 skb_reset_mac_header(skb); 5811 5812 local_bh_disable(); 5813 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5814 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5815 NULL); 5816 local_bh_enable(); 5817 5818 return 0; 5819 } 5820