1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright (C) 2018 Intel Corporation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * 14 * Transmit and frame generation functions. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/slab.h> 19 #include <linux/skbuff.h> 20 #include <linux/if_vlan.h> 21 #include <linux/etherdevice.h> 22 #include <linux/bitmap.h> 23 #include <linux/rcupdate.h> 24 #include <linux/export.h> 25 #include <net/net_namespace.h> 26 #include <net/ieee80211_radiotap.h> 27 #include <net/cfg80211.h> 28 #include <net/mac80211.h> 29 #include <net/codel.h> 30 #include <net/codel_impl.h> 31 #include <asm/unaligned.h> 32 #include <net/fq_impl.h> 33 34 #include "ieee80211_i.h" 35 #include "driver-ops.h" 36 #include "led.h" 37 #include "mesh.h" 38 #include "wep.h" 39 #include "wpa.h" 40 #include "wme.h" 41 #include "rate.h" 42 43 /* misc utils */ 44 45 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 46 { 47 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 48 49 u64_stats_update_begin(&tstats->syncp); 50 tstats->tx_packets++; 51 tstats->tx_bytes += len; 52 u64_stats_update_end(&tstats->syncp); 53 } 54 55 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 56 struct sk_buff *skb, int group_addr, 57 int next_frag_len) 58 { 59 int rate, mrate, erp, dur, i, shift = 0; 60 struct ieee80211_rate *txrate; 61 struct ieee80211_local *local = tx->local; 62 struct ieee80211_supported_band *sband; 63 struct ieee80211_hdr *hdr; 64 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 65 struct ieee80211_chanctx_conf *chanctx_conf; 66 u32 rate_flags = 0; 67 68 /* assume HW handles this */ 69 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 70 return 0; 71 72 rcu_read_lock(); 73 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 74 if (chanctx_conf) { 75 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 76 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 77 } 78 rcu_read_unlock(); 79 80 /* uh huh? */ 81 if (WARN_ON_ONCE(tx->rate.idx < 0)) 82 return 0; 83 84 sband = local->hw.wiphy->bands[info->band]; 85 txrate = &sband->bitrates[tx->rate.idx]; 86 87 erp = txrate->flags & IEEE80211_RATE_ERP_G; 88 89 /* 90 * data and mgmt (except PS Poll): 91 * - during CFP: 32768 92 * - during contention period: 93 * if addr1 is group address: 0 94 * if more fragments = 0 and addr1 is individual address: time to 95 * transmit one ACK plus SIFS 96 * if more fragments = 1 and addr1 is individual address: time to 97 * transmit next fragment plus 2 x ACK plus 3 x SIFS 98 * 99 * IEEE 802.11, 9.6: 100 * - control response frame (CTS or ACK) shall be transmitted using the 101 * same rate as the immediately previous frame in the frame exchange 102 * sequence, if this rate belongs to the PHY mandatory rates, or else 103 * at the highest possible rate belonging to the PHY rates in the 104 * BSSBasicRateSet 105 */ 106 hdr = (struct ieee80211_hdr *)skb->data; 107 if (ieee80211_is_ctl(hdr->frame_control)) { 108 /* TODO: These control frames are not currently sent by 109 * mac80211, but should they be implemented, this function 110 * needs to be updated to support duration field calculation. 111 * 112 * RTS: time needed to transmit pending data/mgmt frame plus 113 * one CTS frame plus one ACK frame plus 3 x SIFS 114 * CTS: duration of immediately previous RTS minus time 115 * required to transmit CTS and its SIFS 116 * ACK: 0 if immediately previous directed data/mgmt had 117 * more=0, with more=1 duration in ACK frame is duration 118 * from previous frame minus time needed to transmit ACK 119 * and its SIFS 120 * PS Poll: BIT(15) | BIT(14) | aid 121 */ 122 return 0; 123 } 124 125 /* data/mgmt */ 126 if (0 /* FIX: data/mgmt during CFP */) 127 return cpu_to_le16(32768); 128 129 if (group_addr) /* Group address as the destination - no ACK */ 130 return 0; 131 132 /* Individual destination address: 133 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 134 * CTS and ACK frames shall be transmitted using the highest rate in 135 * basic rate set that is less than or equal to the rate of the 136 * immediately previous frame and that is using the same modulation 137 * (CCK or OFDM). If no basic rate set matches with these requirements, 138 * the highest mandatory rate of the PHY that is less than or equal to 139 * the rate of the previous frame is used. 140 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 141 */ 142 rate = -1; 143 /* use lowest available if everything fails */ 144 mrate = sband->bitrates[0].bitrate; 145 for (i = 0; i < sband->n_bitrates; i++) { 146 struct ieee80211_rate *r = &sband->bitrates[i]; 147 148 if (r->bitrate > txrate->bitrate) 149 break; 150 151 if ((rate_flags & r->flags) != rate_flags) 152 continue; 153 154 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 155 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 156 157 switch (sband->band) { 158 case NL80211_BAND_2GHZ: { 159 u32 flag; 160 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 161 flag = IEEE80211_RATE_MANDATORY_G; 162 else 163 flag = IEEE80211_RATE_MANDATORY_B; 164 if (r->flags & flag) 165 mrate = r->bitrate; 166 break; 167 } 168 case NL80211_BAND_5GHZ: 169 if (r->flags & IEEE80211_RATE_MANDATORY_A) 170 mrate = r->bitrate; 171 break; 172 case NL80211_BAND_60GHZ: 173 /* TODO, for now fall through */ 174 case NUM_NL80211_BANDS: 175 WARN_ON(1); 176 break; 177 } 178 } 179 if (rate == -1) { 180 /* No matching basic rate found; use highest suitable mandatory 181 * PHY rate */ 182 rate = DIV_ROUND_UP(mrate, 1 << shift); 183 } 184 185 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 186 if (ieee80211_is_data_qos(hdr->frame_control) && 187 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 188 dur = 0; 189 else 190 /* Time needed to transmit ACK 191 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 192 * to closest integer */ 193 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 194 tx->sdata->vif.bss_conf.use_short_preamble, 195 shift); 196 197 if (next_frag_len) { 198 /* Frame is fragmented: duration increases with time needed to 199 * transmit next fragment plus ACK and 2 x SIFS. */ 200 dur *= 2; /* ACK + SIFS */ 201 /* next fragment */ 202 dur += ieee80211_frame_duration(sband->band, next_frag_len, 203 txrate->bitrate, erp, 204 tx->sdata->vif.bss_conf.use_short_preamble, 205 shift); 206 } 207 208 return cpu_to_le16(dur); 209 } 210 211 /* tx handlers */ 212 static ieee80211_tx_result debug_noinline 213 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 214 { 215 struct ieee80211_local *local = tx->local; 216 struct ieee80211_if_managed *ifmgd; 217 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 218 219 /* driver doesn't support power save */ 220 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 221 return TX_CONTINUE; 222 223 /* hardware does dynamic power save */ 224 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 225 return TX_CONTINUE; 226 227 /* dynamic power save disabled */ 228 if (local->hw.conf.dynamic_ps_timeout <= 0) 229 return TX_CONTINUE; 230 231 /* we are scanning, don't enable power save */ 232 if (local->scanning) 233 return TX_CONTINUE; 234 235 if (!local->ps_sdata) 236 return TX_CONTINUE; 237 238 /* No point if we're going to suspend */ 239 if (local->quiescing) 240 return TX_CONTINUE; 241 242 /* dynamic ps is supported only in managed mode */ 243 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 244 return TX_CONTINUE; 245 246 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 247 return TX_CONTINUE; 248 249 ifmgd = &tx->sdata->u.mgd; 250 251 /* 252 * Don't wakeup from power save if u-apsd is enabled, voip ac has 253 * u-apsd enabled and the frame is in voip class. This effectively 254 * means that even if all access categories have u-apsd enabled, in 255 * practise u-apsd is only used with the voip ac. This is a 256 * workaround for the case when received voip class packets do not 257 * have correct qos tag for some reason, due the network or the 258 * peer application. 259 * 260 * Note: ifmgd->uapsd_queues access is racy here. If the value is 261 * changed via debugfs, user needs to reassociate manually to have 262 * everything in sync. 263 */ 264 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 265 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 266 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 267 return TX_CONTINUE; 268 269 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 270 ieee80211_stop_queues_by_reason(&local->hw, 271 IEEE80211_MAX_QUEUE_MAP, 272 IEEE80211_QUEUE_STOP_REASON_PS, 273 false); 274 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 275 ieee80211_queue_work(&local->hw, 276 &local->dynamic_ps_disable_work); 277 } 278 279 /* Don't restart the timer if we're not disassociated */ 280 if (!ifmgd->associated) 281 return TX_CONTINUE; 282 283 mod_timer(&local->dynamic_ps_timer, jiffies + 284 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 285 286 return TX_CONTINUE; 287 } 288 289 static ieee80211_tx_result debug_noinline 290 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 291 { 292 293 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 294 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 295 bool assoc = false; 296 297 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 298 return TX_CONTINUE; 299 300 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 301 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 302 !ieee80211_is_probe_req(hdr->frame_control) && 303 !ieee80211_is_nullfunc(hdr->frame_control)) 304 /* 305 * When software scanning only nullfunc frames (to notify 306 * the sleep state to the AP) and probe requests (for the 307 * active scan) are allowed, all other frames should not be 308 * sent and we should not get here, but if we do 309 * nonetheless, drop them to avoid sending them 310 * off-channel. See the link below and 311 * ieee80211_start_scan() for more. 312 * 313 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 314 */ 315 return TX_DROP; 316 317 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 318 return TX_CONTINUE; 319 320 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 321 return TX_CONTINUE; 322 323 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 324 return TX_CONTINUE; 325 326 if (tx->sta) 327 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 328 329 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 330 if (unlikely(!assoc && 331 ieee80211_is_data(hdr->frame_control))) { 332 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 333 sdata_info(tx->sdata, 334 "dropped data frame to not associated station %pM\n", 335 hdr->addr1); 336 #endif 337 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 338 return TX_DROP; 339 } 340 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 341 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 342 /* 343 * No associated STAs - no need to send multicast 344 * frames. 345 */ 346 return TX_DROP; 347 } 348 349 return TX_CONTINUE; 350 } 351 352 /* This function is called whenever the AP is about to exceed the maximum limit 353 * of buffered frames for power saving STAs. This situation should not really 354 * happen often during normal operation, so dropping the oldest buffered packet 355 * from each queue should be OK to make some room for new frames. */ 356 static void purge_old_ps_buffers(struct ieee80211_local *local) 357 { 358 int total = 0, purged = 0; 359 struct sk_buff *skb; 360 struct ieee80211_sub_if_data *sdata; 361 struct sta_info *sta; 362 363 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 364 struct ps_data *ps; 365 366 if (sdata->vif.type == NL80211_IFTYPE_AP) 367 ps = &sdata->u.ap.ps; 368 else if (ieee80211_vif_is_mesh(&sdata->vif)) 369 ps = &sdata->u.mesh.ps; 370 else 371 continue; 372 373 skb = skb_dequeue(&ps->bc_buf); 374 if (skb) { 375 purged++; 376 ieee80211_free_txskb(&local->hw, skb); 377 } 378 total += skb_queue_len(&ps->bc_buf); 379 } 380 381 /* 382 * Drop one frame from each station from the lowest-priority 383 * AC that has frames at all. 384 */ 385 list_for_each_entry_rcu(sta, &local->sta_list, list) { 386 int ac; 387 388 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 389 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 390 total += skb_queue_len(&sta->ps_tx_buf[ac]); 391 if (skb) { 392 purged++; 393 ieee80211_free_txskb(&local->hw, skb); 394 break; 395 } 396 } 397 } 398 399 local->total_ps_buffered = total; 400 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 401 } 402 403 static ieee80211_tx_result 404 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 405 { 406 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 407 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 408 struct ps_data *ps; 409 410 /* 411 * broadcast/multicast frame 412 * 413 * If any of the associated/peer stations is in power save mode, 414 * the frame is buffered to be sent after DTIM beacon frame. 415 * This is done either by the hardware or us. 416 */ 417 418 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 419 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 420 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 421 if (!tx->sdata->bss) 422 return TX_CONTINUE; 423 424 ps = &tx->sdata->bss->ps; 425 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 426 ps = &tx->sdata->u.mesh.ps; 427 } else { 428 return TX_CONTINUE; 429 } 430 431 432 /* no buffering for ordered frames */ 433 if (ieee80211_has_order(hdr->frame_control)) 434 return TX_CONTINUE; 435 436 if (ieee80211_is_probe_req(hdr->frame_control)) 437 return TX_CONTINUE; 438 439 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 440 info->hw_queue = tx->sdata->vif.cab_queue; 441 442 /* no stations in PS mode and no buffered packets */ 443 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 444 return TX_CONTINUE; 445 446 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 447 448 /* device releases frame after DTIM beacon */ 449 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 450 return TX_CONTINUE; 451 452 /* buffered in mac80211 */ 453 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 454 purge_old_ps_buffers(tx->local); 455 456 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 457 ps_dbg(tx->sdata, 458 "BC TX buffer full - dropping the oldest frame\n"); 459 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 460 } else 461 tx->local->total_ps_buffered++; 462 463 skb_queue_tail(&ps->bc_buf, tx->skb); 464 465 return TX_QUEUED; 466 } 467 468 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 469 struct sk_buff *skb) 470 { 471 if (!ieee80211_is_mgmt(fc)) 472 return 0; 473 474 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 475 return 0; 476 477 if (!ieee80211_is_robust_mgmt_frame(skb)) 478 return 0; 479 480 return 1; 481 } 482 483 static ieee80211_tx_result 484 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 485 { 486 struct sta_info *sta = tx->sta; 487 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 488 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 489 struct ieee80211_local *local = tx->local; 490 491 if (unlikely(!sta)) 492 return TX_CONTINUE; 493 494 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 495 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 496 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 497 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 498 int ac = skb_get_queue_mapping(tx->skb); 499 500 if (ieee80211_is_mgmt(hdr->frame_control) && 501 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 502 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 503 return TX_CONTINUE; 504 } 505 506 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 507 sta->sta.addr, sta->sta.aid, ac); 508 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 509 purge_old_ps_buffers(tx->local); 510 511 /* sync with ieee80211_sta_ps_deliver_wakeup */ 512 spin_lock(&sta->ps_lock); 513 /* 514 * STA woke up the meantime and all the frames on ps_tx_buf have 515 * been queued to pending queue. No reordering can happen, go 516 * ahead and Tx the packet. 517 */ 518 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 519 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 520 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 521 spin_unlock(&sta->ps_lock); 522 return TX_CONTINUE; 523 } 524 525 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 526 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 527 ps_dbg(tx->sdata, 528 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 529 sta->sta.addr, ac); 530 ieee80211_free_txskb(&local->hw, old); 531 } else 532 tx->local->total_ps_buffered++; 533 534 info->control.jiffies = jiffies; 535 info->control.vif = &tx->sdata->vif; 536 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 537 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 538 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 539 spin_unlock(&sta->ps_lock); 540 541 if (!timer_pending(&local->sta_cleanup)) 542 mod_timer(&local->sta_cleanup, 543 round_jiffies(jiffies + 544 STA_INFO_CLEANUP_INTERVAL)); 545 546 /* 547 * We queued up some frames, so the TIM bit might 548 * need to be set, recalculate it. 549 */ 550 sta_info_recalc_tim(sta); 551 552 return TX_QUEUED; 553 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 554 ps_dbg(tx->sdata, 555 "STA %pM in PS mode, but polling/in SP -> send frame\n", 556 sta->sta.addr); 557 } 558 559 return TX_CONTINUE; 560 } 561 562 static ieee80211_tx_result debug_noinline 563 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 564 { 565 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 566 return TX_CONTINUE; 567 568 if (tx->flags & IEEE80211_TX_UNICAST) 569 return ieee80211_tx_h_unicast_ps_buf(tx); 570 else 571 return ieee80211_tx_h_multicast_ps_buf(tx); 572 } 573 574 static ieee80211_tx_result debug_noinline 575 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 576 { 577 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 578 579 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 580 if (tx->sdata->control_port_no_encrypt) 581 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 582 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 583 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 584 } 585 586 return TX_CONTINUE; 587 } 588 589 static ieee80211_tx_result debug_noinline 590 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 591 { 592 struct ieee80211_key *key; 593 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 594 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 595 596 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 597 tx->key = NULL; 598 else if (tx->sta && 599 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 600 tx->key = key; 601 else if (ieee80211_is_group_privacy_action(tx->skb) && 602 (key = rcu_dereference(tx->sdata->default_multicast_key))) 603 tx->key = key; 604 else if (ieee80211_is_mgmt(hdr->frame_control) && 605 is_multicast_ether_addr(hdr->addr1) && 606 ieee80211_is_robust_mgmt_frame(tx->skb) && 607 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 608 tx->key = key; 609 else if (is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_multicast_key))) 611 tx->key = key; 612 else if (!is_multicast_ether_addr(hdr->addr1) && 613 (key = rcu_dereference(tx->sdata->default_unicast_key))) 614 tx->key = key; 615 else 616 tx->key = NULL; 617 618 if (tx->key) { 619 bool skip_hw = false; 620 621 /* TODO: add threshold stuff again */ 622 623 switch (tx->key->conf.cipher) { 624 case WLAN_CIPHER_SUITE_WEP40: 625 case WLAN_CIPHER_SUITE_WEP104: 626 case WLAN_CIPHER_SUITE_TKIP: 627 if (!ieee80211_is_data_present(hdr->frame_control)) 628 tx->key = NULL; 629 break; 630 case WLAN_CIPHER_SUITE_CCMP: 631 case WLAN_CIPHER_SUITE_CCMP_256: 632 case WLAN_CIPHER_SUITE_GCMP: 633 case WLAN_CIPHER_SUITE_GCMP_256: 634 if (!ieee80211_is_data_present(hdr->frame_control) && 635 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 636 tx->skb) && 637 !ieee80211_is_group_privacy_action(tx->skb)) 638 tx->key = NULL; 639 else 640 skip_hw = (tx->key->conf.flags & 641 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 642 ieee80211_is_mgmt(hdr->frame_control); 643 break; 644 case WLAN_CIPHER_SUITE_AES_CMAC: 645 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 646 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 647 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 648 if (!ieee80211_is_mgmt(hdr->frame_control)) 649 tx->key = NULL; 650 break; 651 } 652 653 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 654 !ieee80211_is_deauth(hdr->frame_control))) 655 return TX_DROP; 656 657 if (!skip_hw && tx->key && 658 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 659 info->control.hw_key = &tx->key->conf; 660 } 661 662 return TX_CONTINUE; 663 } 664 665 static ieee80211_tx_result debug_noinline 666 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 667 { 668 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 669 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 670 struct ieee80211_supported_band *sband; 671 u32 len; 672 struct ieee80211_tx_rate_control txrc; 673 struct ieee80211_sta_rates *ratetbl = NULL; 674 bool assoc = false; 675 676 memset(&txrc, 0, sizeof(txrc)); 677 678 sband = tx->local->hw.wiphy->bands[info->band]; 679 680 len = min_t(u32, tx->skb->len + FCS_LEN, 681 tx->local->hw.wiphy->frag_threshold); 682 683 /* set up the tx rate control struct we give the RC algo */ 684 txrc.hw = &tx->local->hw; 685 txrc.sband = sband; 686 txrc.bss_conf = &tx->sdata->vif.bss_conf; 687 txrc.skb = tx->skb; 688 txrc.reported_rate.idx = -1; 689 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 690 691 if (tx->sdata->rc_has_mcs_mask[info->band]) 692 txrc.rate_idx_mcs_mask = 693 tx->sdata->rc_rateidx_mcs_mask[info->band]; 694 695 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 696 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 697 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 698 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 699 700 /* set up RTS protection if desired */ 701 if (len > tx->local->hw.wiphy->rts_threshold) { 702 txrc.rts = true; 703 } 704 705 info->control.use_rts = txrc.rts; 706 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 707 708 /* 709 * Use short preamble if the BSS can handle it, but not for 710 * management frames unless we know the receiver can handle 711 * that -- the management frame might be to a station that 712 * just wants a probe response. 713 */ 714 if (tx->sdata->vif.bss_conf.use_short_preamble && 715 (ieee80211_is_data(hdr->frame_control) || 716 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 717 txrc.short_preamble = true; 718 719 info->control.short_preamble = txrc.short_preamble; 720 721 /* don't ask rate control when rate already injected via radiotap */ 722 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 723 return TX_CONTINUE; 724 725 if (tx->sta) 726 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 727 728 /* 729 * Lets not bother rate control if we're associated and cannot 730 * talk to the sta. This should not happen. 731 */ 732 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 733 !rate_usable_index_exists(sband, &tx->sta->sta), 734 "%s: Dropped data frame as no usable bitrate found while " 735 "scanning and associated. Target station: " 736 "%pM on %d GHz band\n", 737 tx->sdata->name, hdr->addr1, 738 info->band ? 5 : 2)) 739 return TX_DROP; 740 741 /* 742 * If we're associated with the sta at this point we know we can at 743 * least send the frame at the lowest bit rate. 744 */ 745 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 746 747 if (tx->sta && !info->control.skip_table) 748 ratetbl = rcu_dereference(tx->sta->sta.rates); 749 750 if (unlikely(info->control.rates[0].idx < 0)) { 751 if (ratetbl) { 752 struct ieee80211_tx_rate rate = { 753 .idx = ratetbl->rate[0].idx, 754 .flags = ratetbl->rate[0].flags, 755 .count = ratetbl->rate[0].count 756 }; 757 758 if (ratetbl->rate[0].idx < 0) 759 return TX_DROP; 760 761 tx->rate = rate; 762 } else { 763 return TX_DROP; 764 } 765 } else { 766 tx->rate = info->control.rates[0]; 767 } 768 769 if (txrc.reported_rate.idx < 0) { 770 txrc.reported_rate = tx->rate; 771 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 772 tx->sta->tx_stats.last_rate = txrc.reported_rate; 773 } else if (tx->sta) 774 tx->sta->tx_stats.last_rate = txrc.reported_rate; 775 776 if (ratetbl) 777 return TX_CONTINUE; 778 779 if (unlikely(!info->control.rates[0].count)) 780 info->control.rates[0].count = 1; 781 782 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 783 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 784 info->control.rates[0].count = 1; 785 786 return TX_CONTINUE; 787 } 788 789 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 790 { 791 u16 *seq = &sta->tid_seq[tid]; 792 __le16 ret = cpu_to_le16(*seq); 793 794 /* Increase the sequence number. */ 795 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 796 797 return ret; 798 } 799 800 static ieee80211_tx_result debug_noinline 801 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 802 { 803 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 804 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 805 int tid; 806 807 /* 808 * Packet injection may want to control the sequence 809 * number, if we have no matching interface then we 810 * neither assign one ourselves nor ask the driver to. 811 */ 812 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 813 return TX_CONTINUE; 814 815 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 816 return TX_CONTINUE; 817 818 if (ieee80211_hdrlen(hdr->frame_control) < 24) 819 return TX_CONTINUE; 820 821 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 822 return TX_CONTINUE; 823 824 /* 825 * Anything but QoS data that has a sequence number field 826 * (is long enough) gets a sequence number from the global 827 * counter. QoS data frames with a multicast destination 828 * also use the global counter (802.11-2012 9.3.2.10). 829 */ 830 if (!ieee80211_is_data_qos(hdr->frame_control) || 831 is_multicast_ether_addr(hdr->addr1)) { 832 if (tx->flags & IEEE80211_TX_NO_SEQNO) 833 return TX_CONTINUE; 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->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->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->tx_stats.bytes[ac] += skb->len; 1008 } 1009 if (ac >= 0) 1010 tx->sta->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->flags |= IEEE80211_TX_INTFL_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 /* 1152 * initialises @tx 1153 * pass %NULL for the station if unknown, a valid pointer if known 1154 * or an ERR_PTR() if the station is known not to exist 1155 */ 1156 static ieee80211_tx_result 1157 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1158 struct ieee80211_tx_data *tx, 1159 struct sta_info *sta, struct sk_buff *skb) 1160 { 1161 struct ieee80211_local *local = sdata->local; 1162 struct ieee80211_hdr *hdr; 1163 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1164 int tid; 1165 1166 memset(tx, 0, sizeof(*tx)); 1167 tx->skb = skb; 1168 tx->local = local; 1169 tx->sdata = sdata; 1170 __skb_queue_head_init(&tx->skbs); 1171 1172 /* 1173 * If this flag is set to true anywhere, and we get here, 1174 * we are doing the needed processing, so remove the flag 1175 * now. 1176 */ 1177 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1178 1179 hdr = (struct ieee80211_hdr *) skb->data; 1180 1181 if (likely(sta)) { 1182 if (!IS_ERR(sta)) 1183 tx->sta = sta; 1184 } else { 1185 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1186 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1187 if (!tx->sta && sdata->wdev.use_4addr) 1188 return TX_DROP; 1189 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1190 IEEE80211_TX_CTL_INJECTED) || 1191 tx->sdata->control_port_protocol == tx->skb->protocol) { 1192 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1193 } 1194 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1195 tx->sta = sta_info_get(sdata, hdr->addr1); 1196 } 1197 1198 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1199 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1200 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1201 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1202 struct tid_ampdu_tx *tid_tx; 1203 1204 tid = ieee80211_get_tid(hdr); 1205 1206 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1207 if (tid_tx) { 1208 bool queued; 1209 1210 queued = ieee80211_tx_prep_agg(tx, skb, info, 1211 tid_tx, tid); 1212 1213 if (unlikely(queued)) 1214 return TX_QUEUED; 1215 } 1216 } 1217 1218 if (is_multicast_ether_addr(hdr->addr1)) { 1219 tx->flags &= ~IEEE80211_TX_UNICAST; 1220 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1221 } else 1222 tx->flags |= IEEE80211_TX_UNICAST; 1223 1224 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1225 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1226 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1227 info->flags & IEEE80211_TX_CTL_AMPDU) 1228 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1229 } 1230 1231 if (!tx->sta) 1232 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1233 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1234 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1235 ieee80211_check_fast_xmit(tx->sta); 1236 } 1237 1238 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1239 1240 return TX_CONTINUE; 1241 } 1242 1243 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1244 struct ieee80211_vif *vif, 1245 struct sta_info *sta, 1246 struct sk_buff *skb) 1247 { 1248 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1249 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1250 struct ieee80211_txq *txq = NULL; 1251 1252 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1253 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1254 return NULL; 1255 1256 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1257 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1258 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1259 vif->type == NL80211_IFTYPE_STATION) && 1260 sta && sta->uploaded) { 1261 /* 1262 * This will be NULL if the driver didn't set the 1263 * opt-in hardware flag. 1264 */ 1265 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1266 } 1267 } else if (sta) { 1268 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1269 1270 if (!sta->uploaded) 1271 return NULL; 1272 1273 txq = sta->sta.txq[tid]; 1274 } else if (vif) { 1275 txq = vif->txq; 1276 } 1277 1278 if (!txq) 1279 return NULL; 1280 1281 return to_txq_info(txq); 1282 } 1283 1284 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1285 { 1286 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1287 } 1288 1289 static u32 codel_skb_len_func(const struct sk_buff *skb) 1290 { 1291 return skb->len; 1292 } 1293 1294 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1295 { 1296 const struct ieee80211_tx_info *info; 1297 1298 info = (const struct ieee80211_tx_info *)skb->cb; 1299 return info->control.enqueue_time; 1300 } 1301 1302 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1303 void *ctx) 1304 { 1305 struct ieee80211_local *local; 1306 struct txq_info *txqi; 1307 struct fq *fq; 1308 struct fq_flow *flow; 1309 1310 txqi = ctx; 1311 local = vif_to_sdata(txqi->txq.vif)->local; 1312 fq = &local->fq; 1313 1314 if (cvars == &txqi->def_cvars) 1315 flow = &txqi->def_flow; 1316 else 1317 flow = &fq->flows[cvars - local->cvars]; 1318 1319 return fq_flow_dequeue(fq, flow); 1320 } 1321 1322 static void codel_drop_func(struct sk_buff *skb, 1323 void *ctx) 1324 { 1325 struct ieee80211_local *local; 1326 struct ieee80211_hw *hw; 1327 struct txq_info *txqi; 1328 1329 txqi = ctx; 1330 local = vif_to_sdata(txqi->txq.vif)->local; 1331 hw = &local->hw; 1332 1333 ieee80211_free_txskb(hw, skb); 1334 } 1335 1336 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1337 struct fq_tin *tin, 1338 struct fq_flow *flow) 1339 { 1340 struct ieee80211_local *local; 1341 struct txq_info *txqi; 1342 struct codel_vars *cvars; 1343 struct codel_params *cparams; 1344 struct codel_stats *cstats; 1345 1346 local = container_of(fq, struct ieee80211_local, fq); 1347 txqi = container_of(tin, struct txq_info, tin); 1348 cstats = &txqi->cstats; 1349 1350 if (txqi->txq.sta) { 1351 struct sta_info *sta = container_of(txqi->txq.sta, 1352 struct sta_info, sta); 1353 cparams = &sta->cparams; 1354 } else { 1355 cparams = &local->cparams; 1356 } 1357 1358 if (flow == &txqi->def_flow) 1359 cvars = &txqi->def_cvars; 1360 else 1361 cvars = &local->cvars[flow - fq->flows]; 1362 1363 return codel_dequeue(txqi, 1364 &flow->backlog, 1365 cparams, 1366 cvars, 1367 cstats, 1368 codel_skb_len_func, 1369 codel_skb_time_func, 1370 codel_drop_func, 1371 codel_dequeue_func); 1372 } 1373 1374 static void fq_skb_free_func(struct fq *fq, 1375 struct fq_tin *tin, 1376 struct fq_flow *flow, 1377 struct sk_buff *skb) 1378 { 1379 struct ieee80211_local *local; 1380 1381 local = container_of(fq, struct ieee80211_local, fq); 1382 ieee80211_free_txskb(&local->hw, skb); 1383 } 1384 1385 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1386 struct fq_tin *tin, 1387 int idx, 1388 struct sk_buff *skb) 1389 { 1390 struct txq_info *txqi; 1391 1392 txqi = container_of(tin, struct txq_info, tin); 1393 return &txqi->def_flow; 1394 } 1395 1396 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1397 struct txq_info *txqi, 1398 struct sk_buff *skb) 1399 { 1400 struct fq *fq = &local->fq; 1401 struct fq_tin *tin = &txqi->tin; 1402 u32 flow_idx = fq_flow_idx(fq, skb); 1403 1404 ieee80211_set_skb_enqueue_time(skb); 1405 1406 spin_lock_bh(&fq->lock); 1407 fq_tin_enqueue(fq, tin, flow_idx, skb, 1408 fq_skb_free_func, 1409 fq_flow_get_default_func); 1410 spin_unlock_bh(&fq->lock); 1411 } 1412 1413 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1414 struct fq_flow *flow, struct sk_buff *skb, 1415 void *data) 1416 { 1417 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1418 1419 return info->control.vif == data; 1420 } 1421 1422 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1423 struct ieee80211_sub_if_data *sdata) 1424 { 1425 struct fq *fq = &local->fq; 1426 struct txq_info *txqi; 1427 struct fq_tin *tin; 1428 struct ieee80211_sub_if_data *ap; 1429 1430 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1431 return; 1432 1433 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1434 1435 if (!ap->vif.txq) 1436 return; 1437 1438 txqi = to_txq_info(ap->vif.txq); 1439 tin = &txqi->tin; 1440 1441 spin_lock_bh(&fq->lock); 1442 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1443 fq_skb_free_func); 1444 spin_unlock_bh(&fq->lock); 1445 } 1446 1447 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1448 struct sta_info *sta, 1449 struct txq_info *txqi, int tid) 1450 { 1451 fq_tin_init(&txqi->tin); 1452 fq_flow_init(&txqi->def_flow); 1453 codel_vars_init(&txqi->def_cvars); 1454 codel_stats_init(&txqi->cstats); 1455 __skb_queue_head_init(&txqi->frags); 1456 INIT_LIST_HEAD(&txqi->schedule_order); 1457 1458 txqi->txq.vif = &sdata->vif; 1459 1460 if (!sta) { 1461 sdata->vif.txq = &txqi->txq; 1462 txqi->txq.tid = 0; 1463 txqi->txq.ac = IEEE80211_AC_BE; 1464 1465 return; 1466 } 1467 1468 if (tid == IEEE80211_NUM_TIDS) { 1469 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1470 /* Drivers need to opt in to the management MPDU TXQ */ 1471 if (!ieee80211_hw_check(&sdata->local->hw, 1472 STA_MMPDU_TXQ)) 1473 return; 1474 } else if (!ieee80211_hw_check(&sdata->local->hw, 1475 BUFF_MMPDU_TXQ)) { 1476 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1477 return; 1478 } 1479 txqi->txq.ac = IEEE80211_AC_VO; 1480 } else { 1481 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1482 } 1483 1484 txqi->txq.sta = &sta->sta; 1485 txqi->txq.tid = tid; 1486 sta->sta.txq[tid] = &txqi->txq; 1487 } 1488 1489 void ieee80211_txq_purge(struct ieee80211_local *local, 1490 struct txq_info *txqi) 1491 { 1492 struct fq *fq = &local->fq; 1493 struct fq_tin *tin = &txqi->tin; 1494 1495 spin_lock_bh(&fq->lock); 1496 fq_tin_reset(fq, tin, fq_skb_free_func); 1497 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1498 spin_unlock_bh(&fq->lock); 1499 1500 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1501 list_del_init(&txqi->schedule_order); 1502 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1503 } 1504 1505 void ieee80211_txq_set_params(struct ieee80211_local *local) 1506 { 1507 if (local->hw.wiphy->txq_limit) 1508 local->fq.limit = local->hw.wiphy->txq_limit; 1509 else 1510 local->hw.wiphy->txq_limit = local->fq.limit; 1511 1512 if (local->hw.wiphy->txq_memory_limit) 1513 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1514 else 1515 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1516 1517 if (local->hw.wiphy->txq_quantum) 1518 local->fq.quantum = local->hw.wiphy->txq_quantum; 1519 else 1520 local->hw.wiphy->txq_quantum = local->fq.quantum; 1521 } 1522 1523 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1524 { 1525 struct fq *fq = &local->fq; 1526 int ret; 1527 int i; 1528 bool supp_vht = false; 1529 enum nl80211_band band; 1530 1531 if (!local->ops->wake_tx_queue) 1532 return 0; 1533 1534 ret = fq_init(fq, 4096); 1535 if (ret) 1536 return ret; 1537 1538 /* 1539 * If the hardware doesn't support VHT, it is safe to limit the maximum 1540 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1541 */ 1542 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1543 struct ieee80211_supported_band *sband; 1544 1545 sband = local->hw.wiphy->bands[band]; 1546 if (!sband) 1547 continue; 1548 1549 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1550 } 1551 1552 if (!supp_vht) 1553 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1554 1555 codel_params_init(&local->cparams); 1556 local->cparams.interval = MS2TIME(100); 1557 local->cparams.target = MS2TIME(20); 1558 local->cparams.ecn = true; 1559 1560 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1561 GFP_KERNEL); 1562 if (!local->cvars) { 1563 spin_lock_bh(&fq->lock); 1564 fq_reset(fq, fq_skb_free_func); 1565 spin_unlock_bh(&fq->lock); 1566 return -ENOMEM; 1567 } 1568 1569 for (i = 0; i < fq->flows_cnt; i++) 1570 codel_vars_init(&local->cvars[i]); 1571 1572 ieee80211_txq_set_params(local); 1573 1574 return 0; 1575 } 1576 1577 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1578 { 1579 struct fq *fq = &local->fq; 1580 1581 if (!local->ops->wake_tx_queue) 1582 return; 1583 1584 kfree(local->cvars); 1585 local->cvars = NULL; 1586 1587 spin_lock_bh(&fq->lock); 1588 fq_reset(fq, fq_skb_free_func); 1589 spin_unlock_bh(&fq->lock); 1590 } 1591 1592 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1593 struct ieee80211_sub_if_data *sdata, 1594 struct sta_info *sta, 1595 struct sk_buff *skb) 1596 { 1597 struct ieee80211_vif *vif; 1598 struct txq_info *txqi; 1599 1600 if (!local->ops->wake_tx_queue || 1601 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1602 return false; 1603 1604 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1605 sdata = container_of(sdata->bss, 1606 struct ieee80211_sub_if_data, u.ap); 1607 1608 vif = &sdata->vif; 1609 txqi = ieee80211_get_txq(local, vif, sta, skb); 1610 1611 if (!txqi) 1612 return false; 1613 1614 ieee80211_txq_enqueue(local, txqi, skb); 1615 1616 schedule_and_wake_txq(local, txqi); 1617 1618 return true; 1619 } 1620 1621 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1622 struct ieee80211_vif *vif, 1623 struct ieee80211_sta *sta, 1624 struct sk_buff_head *skbs, 1625 bool txpending) 1626 { 1627 struct ieee80211_tx_control control = {}; 1628 struct sk_buff *skb, *tmp; 1629 unsigned long flags; 1630 1631 skb_queue_walk_safe(skbs, skb, tmp) { 1632 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1633 int q = info->hw_queue; 1634 1635 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1636 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1637 __skb_unlink(skb, skbs); 1638 ieee80211_free_txskb(&local->hw, skb); 1639 continue; 1640 } 1641 #endif 1642 1643 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1644 if (local->queue_stop_reasons[q] || 1645 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1646 if (unlikely(info->flags & 1647 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1648 if (local->queue_stop_reasons[q] & 1649 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1650 /* 1651 * Drop off-channel frames if queues 1652 * are stopped for any reason other 1653 * than off-channel operation. Never 1654 * queue them. 1655 */ 1656 spin_unlock_irqrestore( 1657 &local->queue_stop_reason_lock, 1658 flags); 1659 ieee80211_purge_tx_queue(&local->hw, 1660 skbs); 1661 return true; 1662 } 1663 } else { 1664 1665 /* 1666 * Since queue is stopped, queue up frames for 1667 * later transmission from the tx-pending 1668 * tasklet when the queue is woken again. 1669 */ 1670 if (txpending) 1671 skb_queue_splice_init(skbs, 1672 &local->pending[q]); 1673 else 1674 skb_queue_splice_tail_init(skbs, 1675 &local->pending[q]); 1676 1677 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1678 flags); 1679 return false; 1680 } 1681 } 1682 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1683 1684 info->control.vif = vif; 1685 control.sta = sta; 1686 1687 __skb_unlink(skb, skbs); 1688 drv_tx(local, &control, skb); 1689 } 1690 1691 return true; 1692 } 1693 1694 /* 1695 * Returns false if the frame couldn't be transmitted but was queued instead. 1696 */ 1697 static bool __ieee80211_tx(struct ieee80211_local *local, 1698 struct sk_buff_head *skbs, int led_len, 1699 struct sta_info *sta, bool txpending) 1700 { 1701 struct ieee80211_tx_info *info; 1702 struct ieee80211_sub_if_data *sdata; 1703 struct ieee80211_vif *vif; 1704 struct ieee80211_sta *pubsta; 1705 struct sk_buff *skb; 1706 bool result = true; 1707 __le16 fc; 1708 1709 if (WARN_ON(skb_queue_empty(skbs))) 1710 return true; 1711 1712 skb = skb_peek(skbs); 1713 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1714 info = IEEE80211_SKB_CB(skb); 1715 sdata = vif_to_sdata(info->control.vif); 1716 if (sta && !sta->uploaded) 1717 sta = NULL; 1718 1719 if (sta) 1720 pubsta = &sta->sta; 1721 else 1722 pubsta = NULL; 1723 1724 switch (sdata->vif.type) { 1725 case NL80211_IFTYPE_MONITOR: 1726 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1727 vif = &sdata->vif; 1728 break; 1729 } 1730 sdata = rcu_dereference(local->monitor_sdata); 1731 if (sdata) { 1732 vif = &sdata->vif; 1733 info->hw_queue = 1734 vif->hw_queue[skb_get_queue_mapping(skb)]; 1735 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1736 ieee80211_purge_tx_queue(&local->hw, skbs); 1737 return true; 1738 } else 1739 vif = NULL; 1740 break; 1741 case NL80211_IFTYPE_AP_VLAN: 1742 sdata = container_of(sdata->bss, 1743 struct ieee80211_sub_if_data, u.ap); 1744 /* fall through */ 1745 default: 1746 vif = &sdata->vif; 1747 break; 1748 } 1749 1750 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1751 txpending); 1752 1753 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1754 1755 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1756 1757 return result; 1758 } 1759 1760 /* 1761 * Invoke TX handlers, return 0 on success and non-zero if the 1762 * frame was dropped or queued. 1763 * 1764 * The handlers are split into an early and late part. The latter is everything 1765 * that can be sensitive to reordering, and will be deferred to after packets 1766 * are dequeued from the intermediate queues (when they are enabled). 1767 */ 1768 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1769 { 1770 ieee80211_tx_result res = TX_DROP; 1771 1772 #define CALL_TXH(txh) \ 1773 do { \ 1774 res = txh(tx); \ 1775 if (res != TX_CONTINUE) \ 1776 goto txh_done; \ 1777 } while (0) 1778 1779 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1780 CALL_TXH(ieee80211_tx_h_check_assoc); 1781 CALL_TXH(ieee80211_tx_h_ps_buf); 1782 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1783 CALL_TXH(ieee80211_tx_h_select_key); 1784 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1785 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1786 1787 txh_done: 1788 if (unlikely(res == TX_DROP)) { 1789 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1790 if (tx->skb) 1791 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1792 else 1793 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1794 return -1; 1795 } else if (unlikely(res == TX_QUEUED)) { 1796 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1797 return -1; 1798 } 1799 1800 return 0; 1801 } 1802 1803 /* 1804 * Late handlers can be called while the sta lock is held. Handlers that can 1805 * cause packets to be generated will cause deadlock! 1806 */ 1807 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1808 { 1809 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1810 ieee80211_tx_result res = TX_CONTINUE; 1811 1812 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1813 __skb_queue_tail(&tx->skbs, tx->skb); 1814 tx->skb = NULL; 1815 goto txh_done; 1816 } 1817 1818 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1819 CALL_TXH(ieee80211_tx_h_sequence); 1820 CALL_TXH(ieee80211_tx_h_fragment); 1821 /* handlers after fragment must be aware of tx info fragmentation! */ 1822 CALL_TXH(ieee80211_tx_h_stats); 1823 CALL_TXH(ieee80211_tx_h_encrypt); 1824 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1825 CALL_TXH(ieee80211_tx_h_calculate_duration); 1826 #undef CALL_TXH 1827 1828 txh_done: 1829 if (unlikely(res == TX_DROP)) { 1830 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1831 if (tx->skb) 1832 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1833 else 1834 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1835 return -1; 1836 } else if (unlikely(res == TX_QUEUED)) { 1837 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1838 return -1; 1839 } 1840 1841 return 0; 1842 } 1843 1844 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1845 { 1846 int r = invoke_tx_handlers_early(tx); 1847 1848 if (r) 1849 return r; 1850 return invoke_tx_handlers_late(tx); 1851 } 1852 1853 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1854 struct ieee80211_vif *vif, struct sk_buff *skb, 1855 int band, struct ieee80211_sta **sta) 1856 { 1857 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1858 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1859 struct ieee80211_tx_data tx; 1860 struct sk_buff *skb2; 1861 1862 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1863 return false; 1864 1865 info->band = band; 1866 info->control.vif = vif; 1867 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1868 1869 if (invoke_tx_handlers(&tx)) 1870 return false; 1871 1872 if (sta) { 1873 if (tx.sta) 1874 *sta = &tx.sta->sta; 1875 else 1876 *sta = NULL; 1877 } 1878 1879 /* this function isn't suitable for fragmented data frames */ 1880 skb2 = __skb_dequeue(&tx.skbs); 1881 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1882 ieee80211_free_txskb(hw, skb2); 1883 ieee80211_purge_tx_queue(hw, &tx.skbs); 1884 return false; 1885 } 1886 1887 return true; 1888 } 1889 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1890 1891 /* 1892 * Returns false if the frame couldn't be transmitted but was queued instead. 1893 */ 1894 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1895 struct sta_info *sta, struct sk_buff *skb, 1896 bool txpending, u32 txdata_flags) 1897 { 1898 struct ieee80211_local *local = sdata->local; 1899 struct ieee80211_tx_data tx; 1900 ieee80211_tx_result res_prepare; 1901 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1902 bool result = true; 1903 int led_len; 1904 1905 if (unlikely(skb->len < 10)) { 1906 dev_kfree_skb(skb); 1907 return true; 1908 } 1909 1910 /* initialises tx */ 1911 led_len = skb->len; 1912 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1913 1914 tx.flags |= txdata_flags; 1915 1916 if (unlikely(res_prepare == TX_DROP)) { 1917 ieee80211_free_txskb(&local->hw, skb); 1918 return true; 1919 } else if (unlikely(res_prepare == TX_QUEUED)) { 1920 return true; 1921 } 1922 1923 /* set up hw_queue value early */ 1924 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1925 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1926 info->hw_queue = 1927 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1928 1929 if (invoke_tx_handlers_early(&tx)) 1930 return true; 1931 1932 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1933 return true; 1934 1935 if (!invoke_tx_handlers_late(&tx)) 1936 result = __ieee80211_tx(local, &tx.skbs, led_len, 1937 tx.sta, txpending); 1938 1939 return result; 1940 } 1941 1942 /* device xmit handlers */ 1943 1944 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1945 struct sk_buff *skb, 1946 int head_need, bool may_encrypt) 1947 { 1948 struct ieee80211_local *local = sdata->local; 1949 struct ieee80211_hdr *hdr; 1950 bool enc_tailroom; 1951 int tail_need = 0; 1952 1953 hdr = (struct ieee80211_hdr *) skb->data; 1954 enc_tailroom = may_encrypt && 1955 (sdata->crypto_tx_tailroom_needed_cnt || 1956 ieee80211_is_mgmt(hdr->frame_control)); 1957 1958 if (enc_tailroom) { 1959 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1960 tail_need -= skb_tailroom(skb); 1961 tail_need = max_t(int, tail_need, 0); 1962 } 1963 1964 if (skb_cloned(skb) && 1965 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1966 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1967 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1968 else if (head_need || tail_need) 1969 I802_DEBUG_INC(local->tx_expand_skb_head); 1970 else 1971 return 0; 1972 1973 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1974 wiphy_debug(local->hw.wiphy, 1975 "failed to reallocate TX buffer\n"); 1976 return -ENOMEM; 1977 } 1978 1979 return 0; 1980 } 1981 1982 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1983 struct sta_info *sta, struct sk_buff *skb, 1984 u32 txdata_flags) 1985 { 1986 struct ieee80211_local *local = sdata->local; 1987 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1988 struct ieee80211_hdr *hdr; 1989 int headroom; 1990 bool may_encrypt; 1991 1992 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1993 1994 headroom = local->tx_headroom; 1995 if (may_encrypt) 1996 headroom += sdata->encrypt_headroom; 1997 headroom -= skb_headroom(skb); 1998 headroom = max_t(int, 0, headroom); 1999 2000 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 2001 ieee80211_free_txskb(&local->hw, skb); 2002 return; 2003 } 2004 2005 hdr = (struct ieee80211_hdr *) skb->data; 2006 info->control.vif = &sdata->vif; 2007 2008 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2009 if (ieee80211_is_data(hdr->frame_control) && 2010 is_unicast_ether_addr(hdr->addr1)) { 2011 if (mesh_nexthop_resolve(sdata, skb)) 2012 return; /* skb queued: don't free */ 2013 } else { 2014 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2015 } 2016 } 2017 2018 ieee80211_set_qos_hdr(sdata, skb); 2019 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 2020 } 2021 2022 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 2023 struct sk_buff *skb) 2024 { 2025 struct ieee80211_radiotap_iterator iterator; 2026 struct ieee80211_radiotap_header *rthdr = 2027 (struct ieee80211_radiotap_header *) skb->data; 2028 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2029 struct ieee80211_supported_band *sband = 2030 local->hw.wiphy->bands[info->band]; 2031 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2032 NULL); 2033 u16 txflags; 2034 u16 rate = 0; 2035 bool rate_found = false; 2036 u8 rate_retries = 0; 2037 u16 rate_flags = 0; 2038 u8 mcs_known, mcs_flags, mcs_bw; 2039 u16 vht_known; 2040 u8 vht_mcs = 0, vht_nss = 0; 2041 int i; 2042 2043 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2044 IEEE80211_TX_CTL_DONTFRAG; 2045 2046 /* 2047 * for every radiotap entry that is present 2048 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2049 * entries present, or -EINVAL on error) 2050 */ 2051 2052 while (!ret) { 2053 ret = ieee80211_radiotap_iterator_next(&iterator); 2054 2055 if (ret) 2056 continue; 2057 2058 /* see if this argument is something we can use */ 2059 switch (iterator.this_arg_index) { 2060 /* 2061 * You must take care when dereferencing iterator.this_arg 2062 * for multibyte types... the pointer is not aligned. Use 2063 * get_unaligned((type *)iterator.this_arg) to dereference 2064 * iterator.this_arg for type "type" safely on all arches. 2065 */ 2066 case IEEE80211_RADIOTAP_FLAGS: 2067 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2068 /* 2069 * this indicates that the skb we have been 2070 * handed has the 32-bit FCS CRC at the end... 2071 * we should react to that by snipping it off 2072 * because it will be recomputed and added 2073 * on transmission 2074 */ 2075 if (skb->len < (iterator._max_length + FCS_LEN)) 2076 return false; 2077 2078 skb_trim(skb, skb->len - FCS_LEN); 2079 } 2080 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2081 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2082 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2083 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2084 break; 2085 2086 case IEEE80211_RADIOTAP_TX_FLAGS: 2087 txflags = get_unaligned_le16(iterator.this_arg); 2088 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2089 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2090 break; 2091 2092 case IEEE80211_RADIOTAP_RATE: 2093 rate = *iterator.this_arg; 2094 rate_flags = 0; 2095 rate_found = true; 2096 break; 2097 2098 case IEEE80211_RADIOTAP_DATA_RETRIES: 2099 rate_retries = *iterator.this_arg; 2100 break; 2101 2102 case IEEE80211_RADIOTAP_MCS: 2103 mcs_known = iterator.this_arg[0]; 2104 mcs_flags = iterator.this_arg[1]; 2105 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2106 break; 2107 2108 rate_found = true; 2109 rate = iterator.this_arg[2]; 2110 rate_flags = IEEE80211_TX_RC_MCS; 2111 2112 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2113 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2114 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2115 2116 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2117 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2118 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2119 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2120 break; 2121 2122 case IEEE80211_RADIOTAP_VHT: 2123 vht_known = get_unaligned_le16(iterator.this_arg); 2124 rate_found = true; 2125 2126 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2127 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2128 (iterator.this_arg[2] & 2129 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2130 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2131 if (vht_known & 2132 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2133 if (iterator.this_arg[3] == 1) 2134 rate_flags |= 2135 IEEE80211_TX_RC_40_MHZ_WIDTH; 2136 else if (iterator.this_arg[3] == 4) 2137 rate_flags |= 2138 IEEE80211_TX_RC_80_MHZ_WIDTH; 2139 else if (iterator.this_arg[3] == 11) 2140 rate_flags |= 2141 IEEE80211_TX_RC_160_MHZ_WIDTH; 2142 } 2143 2144 vht_mcs = iterator.this_arg[4] >> 4; 2145 vht_nss = iterator.this_arg[4] & 0xF; 2146 break; 2147 2148 /* 2149 * Please update the file 2150 * Documentation/networking/mac80211-injection.txt 2151 * when parsing new fields here. 2152 */ 2153 2154 default: 2155 break; 2156 } 2157 } 2158 2159 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2160 return false; 2161 2162 if (rate_found) { 2163 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2164 2165 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2166 info->control.rates[i].idx = -1; 2167 info->control.rates[i].flags = 0; 2168 info->control.rates[i].count = 0; 2169 } 2170 2171 if (rate_flags & IEEE80211_TX_RC_MCS) { 2172 info->control.rates[0].idx = rate; 2173 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2174 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2175 vht_nss); 2176 } else { 2177 for (i = 0; i < sband->n_bitrates; i++) { 2178 if (rate * 5 != sband->bitrates[i].bitrate) 2179 continue; 2180 2181 info->control.rates[0].idx = i; 2182 break; 2183 } 2184 } 2185 2186 if (info->control.rates[0].idx < 0) 2187 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2188 2189 info->control.rates[0].flags = rate_flags; 2190 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2191 local->hw.max_rate_tries); 2192 } 2193 2194 /* 2195 * remove the radiotap header 2196 * iterator->_max_length was sanity-checked against 2197 * skb->len by iterator init 2198 */ 2199 skb_pull(skb, iterator._max_length); 2200 2201 return true; 2202 } 2203 2204 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2205 struct net_device *dev) 2206 { 2207 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2208 struct ieee80211_chanctx_conf *chanctx_conf; 2209 struct ieee80211_radiotap_header *prthdr = 2210 (struct ieee80211_radiotap_header *)skb->data; 2211 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2212 struct ieee80211_hdr *hdr; 2213 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2214 struct cfg80211_chan_def *chandef; 2215 u16 len_rthdr; 2216 int hdrlen; 2217 2218 /* check for not even having the fixed radiotap header part */ 2219 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2220 goto fail; /* too short to be possibly valid */ 2221 2222 /* is it a header version we can trust to find length from? */ 2223 if (unlikely(prthdr->it_version)) 2224 goto fail; /* only version 0 is supported */ 2225 2226 /* then there must be a radiotap header with a length we can use */ 2227 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2228 2229 /* does the skb contain enough to deliver on the alleged length? */ 2230 if (unlikely(skb->len < len_rthdr)) 2231 goto fail; /* skb too short for claimed rt header extent */ 2232 2233 /* 2234 * fix up the pointers accounting for the radiotap 2235 * header still being in there. We are being given 2236 * a precooked IEEE80211 header so no need for 2237 * normal processing 2238 */ 2239 skb_set_mac_header(skb, len_rthdr); 2240 /* 2241 * these are just fixed to the end of the rt area since we 2242 * don't have any better information and at this point, nobody cares 2243 */ 2244 skb_set_network_header(skb, len_rthdr); 2245 skb_set_transport_header(skb, len_rthdr); 2246 2247 if (skb->len < len_rthdr + 2) 2248 goto fail; 2249 2250 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2251 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2252 2253 if (skb->len < len_rthdr + hdrlen) 2254 goto fail; 2255 2256 /* 2257 * Initialize skb->protocol if the injected frame is a data frame 2258 * carrying a rfc1042 header 2259 */ 2260 if (ieee80211_is_data(hdr->frame_control) && 2261 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2262 u8 *payload = (u8 *)hdr + hdrlen; 2263 2264 if (ether_addr_equal(payload, rfc1042_header)) 2265 skb->protocol = cpu_to_be16((payload[6] << 8) | 2266 payload[7]); 2267 } 2268 2269 memset(info, 0, sizeof(*info)); 2270 2271 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2272 IEEE80211_TX_CTL_INJECTED; 2273 2274 rcu_read_lock(); 2275 2276 /* 2277 * We process outgoing injected frames that have a local address 2278 * we handle as though they are non-injected frames. 2279 * This code here isn't entirely correct, the local MAC address 2280 * isn't always enough to find the interface to use; for proper 2281 * VLAN/WDS support we will need a different mechanism (which 2282 * likely isn't going to be monitor interfaces). 2283 */ 2284 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2285 2286 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2287 if (!ieee80211_sdata_running(tmp_sdata)) 2288 continue; 2289 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2290 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2291 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2292 continue; 2293 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2294 sdata = tmp_sdata; 2295 break; 2296 } 2297 } 2298 2299 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2300 if (!chanctx_conf) { 2301 tmp_sdata = rcu_dereference(local->monitor_sdata); 2302 if (tmp_sdata) 2303 chanctx_conf = 2304 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2305 } 2306 2307 if (chanctx_conf) 2308 chandef = &chanctx_conf->def; 2309 else if (!local->use_chanctx) 2310 chandef = &local->_oper_chandef; 2311 else 2312 goto fail_rcu; 2313 2314 /* 2315 * Frame injection is not allowed if beaconing is not allowed 2316 * or if we need radar detection. Beaconing is usually not allowed when 2317 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2318 * Passive scan is also used in world regulatory domains where 2319 * your country is not known and as such it should be treated as 2320 * NO TX unless the channel is explicitly allowed in which case 2321 * your current regulatory domain would not have the passive scan 2322 * flag. 2323 * 2324 * Since AP mode uses monitor interfaces to inject/TX management 2325 * frames we can make AP mode the exception to this rule once it 2326 * supports radar detection as its implementation can deal with 2327 * radar detection by itself. We can do that later by adding a 2328 * monitor flag interfaces used for AP support. 2329 */ 2330 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2331 sdata->vif.type)) 2332 goto fail_rcu; 2333 2334 info->band = chandef->chan->band; 2335 2336 /* process and remove the injection radiotap header */ 2337 if (!ieee80211_parse_tx_radiotap(local, skb)) 2338 goto fail_rcu; 2339 2340 ieee80211_xmit(sdata, NULL, skb, 0); 2341 rcu_read_unlock(); 2342 2343 return NETDEV_TX_OK; 2344 2345 fail_rcu: 2346 rcu_read_unlock(); 2347 fail: 2348 dev_kfree_skb(skb); 2349 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2350 } 2351 2352 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2353 { 2354 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2355 2356 return ethertype == ETH_P_TDLS && 2357 skb->len > 14 && 2358 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2359 } 2360 2361 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2362 struct sk_buff *skb, 2363 struct sta_info **sta_out) 2364 { 2365 struct sta_info *sta; 2366 2367 switch (sdata->vif.type) { 2368 case NL80211_IFTYPE_AP_VLAN: 2369 sta = rcu_dereference(sdata->u.vlan.sta); 2370 if (sta) { 2371 *sta_out = sta; 2372 return 0; 2373 } else if (sdata->wdev.use_4addr) { 2374 return -ENOLINK; 2375 } 2376 /* fall through */ 2377 case NL80211_IFTYPE_AP: 2378 case NL80211_IFTYPE_OCB: 2379 case NL80211_IFTYPE_ADHOC: 2380 if (is_multicast_ether_addr(skb->data)) { 2381 *sta_out = ERR_PTR(-ENOENT); 2382 return 0; 2383 } 2384 sta = sta_info_get_bss(sdata, skb->data); 2385 break; 2386 case NL80211_IFTYPE_WDS: 2387 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2388 break; 2389 #ifdef CONFIG_MAC80211_MESH 2390 case NL80211_IFTYPE_MESH_POINT: 2391 /* determined much later */ 2392 *sta_out = NULL; 2393 return 0; 2394 #endif 2395 case NL80211_IFTYPE_STATION: 2396 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2397 sta = sta_info_get(sdata, skb->data); 2398 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2399 if (test_sta_flag(sta, 2400 WLAN_STA_TDLS_PEER_AUTH)) { 2401 *sta_out = sta; 2402 return 0; 2403 } 2404 2405 /* 2406 * TDLS link during setup - throw out frames to 2407 * peer. Allow TDLS-setup frames to unauthorized 2408 * peers for the special case of a link teardown 2409 * after a TDLS sta is removed due to being 2410 * unreachable. 2411 */ 2412 if (!ieee80211_is_tdls_setup(skb)) 2413 return -EINVAL; 2414 } 2415 2416 } 2417 2418 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2419 if (!sta) 2420 return -ENOLINK; 2421 break; 2422 default: 2423 return -EINVAL; 2424 } 2425 2426 *sta_out = sta ?: ERR_PTR(-ENOENT); 2427 return 0; 2428 } 2429 2430 /** 2431 * ieee80211_build_hdr - build 802.11 header in the given frame 2432 * @sdata: virtual interface to build the header for 2433 * @skb: the skb to build the header in 2434 * @info_flags: skb flags to set 2435 * @ctrl_flags: info control flags to set 2436 * 2437 * This function takes the skb with 802.3 header and reformats the header to 2438 * the appropriate IEEE 802.11 header based on which interface the packet is 2439 * being transmitted on. 2440 * 2441 * Note that this function also takes care of the TX status request and 2442 * potential unsharing of the SKB - this needs to be interleaved with the 2443 * header building. 2444 * 2445 * The function requires the read-side RCU lock held 2446 * 2447 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2448 */ 2449 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2450 struct sk_buff *skb, u32 info_flags, 2451 struct sta_info *sta, u32 ctrl_flags) 2452 { 2453 struct ieee80211_local *local = sdata->local; 2454 struct ieee80211_tx_info *info; 2455 int head_need; 2456 u16 ethertype, hdrlen, meshhdrlen = 0; 2457 __le16 fc; 2458 struct ieee80211_hdr hdr; 2459 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2460 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2461 const u8 *encaps_data; 2462 int encaps_len, skip_header_bytes; 2463 bool wme_sta = false, authorized = false; 2464 bool tdls_peer; 2465 bool multicast; 2466 u16 info_id = 0; 2467 struct ieee80211_chanctx_conf *chanctx_conf; 2468 struct ieee80211_sub_if_data *ap_sdata; 2469 enum nl80211_band band; 2470 int ret; 2471 2472 if (IS_ERR(sta)) 2473 sta = NULL; 2474 2475 #ifdef CONFIG_MAC80211_DEBUGFS 2476 if (local->force_tx_status) 2477 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2478 #endif 2479 2480 /* convert Ethernet header to proper 802.11 header (based on 2481 * operation mode) */ 2482 ethertype = (skb->data[12] << 8) | skb->data[13]; 2483 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2484 2485 switch (sdata->vif.type) { 2486 case NL80211_IFTYPE_AP_VLAN: 2487 if (sdata->wdev.use_4addr) { 2488 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2489 /* RA TA DA SA */ 2490 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2491 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2492 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2493 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2494 hdrlen = 30; 2495 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2496 wme_sta = sta->sta.wme; 2497 } 2498 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2499 u.ap); 2500 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2501 if (!chanctx_conf) { 2502 ret = -ENOTCONN; 2503 goto free; 2504 } 2505 band = chanctx_conf->def.chan->band; 2506 if (sdata->wdev.use_4addr) 2507 break; 2508 /* fall through */ 2509 case NL80211_IFTYPE_AP: 2510 if (sdata->vif.type == NL80211_IFTYPE_AP) 2511 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2512 if (!chanctx_conf) { 2513 ret = -ENOTCONN; 2514 goto free; 2515 } 2516 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2517 /* DA BSSID SA */ 2518 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2519 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2520 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2521 hdrlen = 24; 2522 band = chanctx_conf->def.chan->band; 2523 break; 2524 case NL80211_IFTYPE_WDS: 2525 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2526 /* RA TA DA SA */ 2527 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2528 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2529 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2530 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2531 hdrlen = 30; 2532 /* 2533 * This is the exception! WDS style interfaces are prohibited 2534 * when channel contexts are in used so this must be valid 2535 */ 2536 band = local->hw.conf.chandef.chan->band; 2537 break; 2538 #ifdef CONFIG_MAC80211_MESH 2539 case NL80211_IFTYPE_MESH_POINT: 2540 if (!is_multicast_ether_addr(skb->data)) { 2541 struct sta_info *next_hop; 2542 bool mpp_lookup = true; 2543 2544 mpath = mesh_path_lookup(sdata, skb->data); 2545 if (mpath) { 2546 mpp_lookup = false; 2547 next_hop = rcu_dereference(mpath->next_hop); 2548 if (!next_hop || 2549 !(mpath->flags & (MESH_PATH_ACTIVE | 2550 MESH_PATH_RESOLVING))) 2551 mpp_lookup = true; 2552 } 2553 2554 if (mpp_lookup) { 2555 mppath = mpp_path_lookup(sdata, skb->data); 2556 if (mppath) 2557 mppath->exp_time = jiffies; 2558 } 2559 2560 if (mppath && mpath) 2561 mesh_path_del(sdata, mpath->dst); 2562 } 2563 2564 /* 2565 * Use address extension if it is a packet from 2566 * another interface or if we know the destination 2567 * is being proxied by a portal (i.e. portal address 2568 * differs from proxied address) 2569 */ 2570 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2571 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2572 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2573 skb->data, skb->data + ETH_ALEN); 2574 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2575 NULL, NULL); 2576 } else { 2577 /* DS -> MBSS (802.11-2012 13.11.3.3). 2578 * For unicast with unknown forwarding information, 2579 * destination might be in the MBSS or if that fails 2580 * forwarded to another mesh gate. In either case 2581 * resolution will be handled in ieee80211_xmit(), so 2582 * leave the original DA. This also works for mcast */ 2583 const u8 *mesh_da = skb->data; 2584 2585 if (mppath) 2586 mesh_da = mppath->mpp; 2587 else if (mpath) 2588 mesh_da = mpath->dst; 2589 2590 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2591 mesh_da, sdata->vif.addr); 2592 if (is_multicast_ether_addr(mesh_da)) 2593 /* DA TA mSA AE:SA */ 2594 meshhdrlen = ieee80211_new_mesh_header( 2595 sdata, &mesh_hdr, 2596 skb->data + ETH_ALEN, NULL); 2597 else 2598 /* RA TA mDA mSA AE:DA SA */ 2599 meshhdrlen = ieee80211_new_mesh_header( 2600 sdata, &mesh_hdr, skb->data, 2601 skb->data + ETH_ALEN); 2602 2603 } 2604 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2605 if (!chanctx_conf) { 2606 ret = -ENOTCONN; 2607 goto free; 2608 } 2609 band = chanctx_conf->def.chan->band; 2610 break; 2611 #endif 2612 case NL80211_IFTYPE_STATION: 2613 /* we already did checks when looking up the RA STA */ 2614 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2615 2616 if (tdls_peer) { 2617 /* DA SA BSSID */ 2618 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2619 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2620 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2621 hdrlen = 24; 2622 } else if (sdata->u.mgd.use_4addr && 2623 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2624 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2625 IEEE80211_FCTL_TODS); 2626 /* RA TA DA SA */ 2627 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2628 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2629 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2630 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2631 hdrlen = 30; 2632 } else { 2633 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2634 /* BSSID SA DA */ 2635 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2636 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2637 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2638 hdrlen = 24; 2639 } 2640 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2641 if (!chanctx_conf) { 2642 ret = -ENOTCONN; 2643 goto free; 2644 } 2645 band = chanctx_conf->def.chan->band; 2646 break; 2647 case NL80211_IFTYPE_OCB: 2648 /* DA SA BSSID */ 2649 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2650 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2651 eth_broadcast_addr(hdr.addr3); 2652 hdrlen = 24; 2653 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2654 if (!chanctx_conf) { 2655 ret = -ENOTCONN; 2656 goto free; 2657 } 2658 band = chanctx_conf->def.chan->band; 2659 break; 2660 case NL80211_IFTYPE_ADHOC: 2661 /* DA SA BSSID */ 2662 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2663 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2664 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2665 hdrlen = 24; 2666 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2667 if (!chanctx_conf) { 2668 ret = -ENOTCONN; 2669 goto free; 2670 } 2671 band = chanctx_conf->def.chan->band; 2672 break; 2673 default: 2674 ret = -EINVAL; 2675 goto free; 2676 } 2677 2678 multicast = is_multicast_ether_addr(hdr.addr1); 2679 2680 /* sta is always NULL for mesh */ 2681 if (sta) { 2682 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2683 wme_sta = sta->sta.wme; 2684 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2685 /* For mesh, the use of the QoS header is mandatory */ 2686 wme_sta = true; 2687 } 2688 2689 /* receiver does QoS (which also means we do) use it */ 2690 if (wme_sta) { 2691 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2692 hdrlen += 2; 2693 } 2694 2695 /* 2696 * Drop unicast frames to unauthorised stations unless they are 2697 * EAPOL frames from the local station. 2698 */ 2699 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2700 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2701 !multicast && !authorized && 2702 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2703 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2704 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2705 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2706 sdata->name, hdr.addr1); 2707 #endif 2708 2709 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2710 2711 ret = -EPERM; 2712 goto free; 2713 } 2714 2715 if (unlikely(!multicast && skb->sk && 2716 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2717 struct sk_buff *ack_skb = skb_clone_sk(skb); 2718 2719 if (ack_skb) { 2720 unsigned long flags; 2721 int id; 2722 2723 spin_lock_irqsave(&local->ack_status_lock, flags); 2724 id = idr_alloc(&local->ack_status_frames, ack_skb, 2725 1, 0x10000, GFP_ATOMIC); 2726 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2727 2728 if (id >= 0) { 2729 info_id = id; 2730 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2731 } else { 2732 kfree_skb(ack_skb); 2733 } 2734 } 2735 } 2736 2737 /* 2738 * If the skb is shared we need to obtain our own copy. 2739 */ 2740 if (skb_shared(skb)) { 2741 struct sk_buff *tmp_skb = skb; 2742 2743 /* can't happen -- skb is a clone if info_id != 0 */ 2744 WARN_ON(info_id); 2745 2746 skb = skb_clone(skb, GFP_ATOMIC); 2747 kfree_skb(tmp_skb); 2748 2749 if (!skb) { 2750 ret = -ENOMEM; 2751 goto free; 2752 } 2753 } 2754 2755 hdr.frame_control = fc; 2756 hdr.duration_id = 0; 2757 hdr.seq_ctrl = 0; 2758 2759 skip_header_bytes = ETH_HLEN; 2760 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2761 encaps_data = bridge_tunnel_header; 2762 encaps_len = sizeof(bridge_tunnel_header); 2763 skip_header_bytes -= 2; 2764 } else if (ethertype >= ETH_P_802_3_MIN) { 2765 encaps_data = rfc1042_header; 2766 encaps_len = sizeof(rfc1042_header); 2767 skip_header_bytes -= 2; 2768 } else { 2769 encaps_data = NULL; 2770 encaps_len = 0; 2771 } 2772 2773 skb_pull(skb, skip_header_bytes); 2774 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2775 2776 /* 2777 * So we need to modify the skb header and hence need a copy of 2778 * that. The head_need variable above doesn't, so far, include 2779 * the needed header space that we don't need right away. If we 2780 * can, then we don't reallocate right now but only after the 2781 * frame arrives at the master device (if it does...) 2782 * 2783 * If we cannot, however, then we will reallocate to include all 2784 * the ever needed space. Also, if we need to reallocate it anyway, 2785 * make it big enough for everything we may ever need. 2786 */ 2787 2788 if (head_need > 0 || skb_cloned(skb)) { 2789 head_need += sdata->encrypt_headroom; 2790 head_need += local->tx_headroom; 2791 head_need = max_t(int, 0, head_need); 2792 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2793 ieee80211_free_txskb(&local->hw, skb); 2794 skb = NULL; 2795 return ERR_PTR(-ENOMEM); 2796 } 2797 } 2798 2799 if (encaps_data) 2800 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2801 2802 #ifdef CONFIG_MAC80211_MESH 2803 if (meshhdrlen > 0) 2804 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2805 #endif 2806 2807 if (ieee80211_is_data_qos(fc)) { 2808 __le16 *qos_control; 2809 2810 qos_control = skb_push(skb, 2); 2811 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2812 /* 2813 * Maybe we could actually set some fields here, for now just 2814 * initialise to zero to indicate no special operation. 2815 */ 2816 *qos_control = 0; 2817 } else 2818 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2819 2820 skb_reset_mac_header(skb); 2821 2822 info = IEEE80211_SKB_CB(skb); 2823 memset(info, 0, sizeof(*info)); 2824 2825 info->flags = info_flags; 2826 info->ack_frame_id = info_id; 2827 info->band = band; 2828 info->control.flags = ctrl_flags; 2829 2830 return skb; 2831 free: 2832 kfree_skb(skb); 2833 return ERR_PTR(ret); 2834 } 2835 2836 /* 2837 * fast-xmit overview 2838 * 2839 * The core idea of this fast-xmit is to remove per-packet checks by checking 2840 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2841 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2842 * much less work can be done per packet. For example, fragmentation must be 2843 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2844 * in the code here. 2845 * 2846 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2847 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2848 * 2849 * The most difficult part of this is that when any of these assumptions 2850 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2851 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2852 * since the per-packet code no longer checks the conditions. This is reflected 2853 * by the calls to these functions throughout the rest of the code, and must be 2854 * maintained if any of the TX path checks change. 2855 */ 2856 2857 void ieee80211_check_fast_xmit(struct sta_info *sta) 2858 { 2859 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2860 struct ieee80211_local *local = sta->local; 2861 struct ieee80211_sub_if_data *sdata = sta->sdata; 2862 struct ieee80211_hdr *hdr = (void *)build.hdr; 2863 struct ieee80211_chanctx_conf *chanctx_conf; 2864 __le16 fc; 2865 2866 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2867 return; 2868 2869 /* Locking here protects both the pointer itself, and against concurrent 2870 * invocations winning data access races to, e.g., the key pointer that 2871 * is used. 2872 * Without it, the invocation of this function right after the key 2873 * pointer changes wouldn't be sufficient, as another CPU could access 2874 * the pointer, then stall, and then do the cache update after the CPU 2875 * that invalidated the key. 2876 * With the locking, such scenarios cannot happen as the check for the 2877 * key and the fast-tx assignment are done atomically, so the CPU that 2878 * modifies the key will either wait or other one will see the key 2879 * cleared/changed already. 2880 */ 2881 spin_lock_bh(&sta->lock); 2882 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2883 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2884 sdata->vif.type == NL80211_IFTYPE_STATION) 2885 goto out; 2886 2887 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2888 goto out; 2889 2890 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2891 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2892 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2893 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2894 goto out; 2895 2896 if (sdata->noack_map) 2897 goto out; 2898 2899 /* fast-xmit doesn't handle fragmentation at all */ 2900 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2901 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2902 goto out; 2903 2904 rcu_read_lock(); 2905 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2906 if (!chanctx_conf) { 2907 rcu_read_unlock(); 2908 goto out; 2909 } 2910 build.band = chanctx_conf->def.chan->band; 2911 rcu_read_unlock(); 2912 2913 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2914 2915 switch (sdata->vif.type) { 2916 case NL80211_IFTYPE_ADHOC: 2917 /* DA SA BSSID */ 2918 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2919 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2920 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2921 build.hdr_len = 24; 2922 break; 2923 case NL80211_IFTYPE_STATION: 2924 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2925 /* DA SA BSSID */ 2926 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2927 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2928 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2929 build.hdr_len = 24; 2930 break; 2931 } 2932 2933 if (sdata->u.mgd.use_4addr) { 2934 /* non-regular ethertype cannot use the fastpath */ 2935 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2936 IEEE80211_FCTL_TODS); 2937 /* RA TA DA SA */ 2938 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2939 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2940 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2941 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2942 build.hdr_len = 30; 2943 break; 2944 } 2945 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2946 /* BSSID SA DA */ 2947 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2948 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2949 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2950 build.hdr_len = 24; 2951 break; 2952 case NL80211_IFTYPE_AP_VLAN: 2953 if (sdata->wdev.use_4addr) { 2954 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2955 IEEE80211_FCTL_TODS); 2956 /* RA TA DA SA */ 2957 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2958 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2959 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2960 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2961 build.hdr_len = 30; 2962 break; 2963 } 2964 /* fall through */ 2965 case NL80211_IFTYPE_AP: 2966 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2967 /* DA BSSID SA */ 2968 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2969 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2970 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2971 build.hdr_len = 24; 2972 break; 2973 default: 2974 /* not handled on fast-xmit */ 2975 goto out; 2976 } 2977 2978 if (sta->sta.wme) { 2979 build.hdr_len += 2; 2980 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2981 } 2982 2983 /* We store the key here so there's no point in using rcu_dereference() 2984 * but that's fine because the code that changes the pointers will call 2985 * this function after doing so. For a single CPU that would be enough, 2986 * for multiple see the comment above. 2987 */ 2988 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2989 if (!build.key) 2990 build.key = rcu_access_pointer(sdata->default_unicast_key); 2991 if (build.key) { 2992 bool gen_iv, iv_spc, mmic; 2993 2994 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2995 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2996 mmic = build.key->conf.flags & 2997 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 2998 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 2999 3000 /* don't handle software crypto */ 3001 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3002 goto out; 3003 3004 /* Key is being removed */ 3005 if (build.key->flags & KEY_FLAG_TAINTED) 3006 goto out; 3007 3008 switch (build.key->conf.cipher) { 3009 case WLAN_CIPHER_SUITE_CCMP: 3010 case WLAN_CIPHER_SUITE_CCMP_256: 3011 if (gen_iv) 3012 build.pn_offs = build.hdr_len; 3013 if (gen_iv || iv_spc) 3014 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3015 break; 3016 case WLAN_CIPHER_SUITE_GCMP: 3017 case WLAN_CIPHER_SUITE_GCMP_256: 3018 if (gen_iv) 3019 build.pn_offs = build.hdr_len; 3020 if (gen_iv || iv_spc) 3021 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3022 break; 3023 case WLAN_CIPHER_SUITE_TKIP: 3024 /* cannot handle MMIC or IV generation in xmit-fast */ 3025 if (mmic || gen_iv) 3026 goto out; 3027 if (iv_spc) 3028 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3029 break; 3030 case WLAN_CIPHER_SUITE_WEP40: 3031 case WLAN_CIPHER_SUITE_WEP104: 3032 /* cannot handle IV generation in fast-xmit */ 3033 if (gen_iv) 3034 goto out; 3035 if (iv_spc) 3036 build.hdr_len += IEEE80211_WEP_IV_LEN; 3037 break; 3038 case WLAN_CIPHER_SUITE_AES_CMAC: 3039 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3040 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3041 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3042 WARN(1, 3043 "management cipher suite 0x%x enabled for data\n", 3044 build.key->conf.cipher); 3045 goto out; 3046 default: 3047 /* we don't know how to generate IVs for this at all */ 3048 if (WARN_ON(gen_iv)) 3049 goto out; 3050 /* pure hardware keys are OK, of course */ 3051 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3052 break; 3053 /* cipher scheme might require space allocation */ 3054 if (iv_spc && 3055 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3056 goto out; 3057 if (iv_spc) 3058 build.hdr_len += build.key->conf.iv_len; 3059 } 3060 3061 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3062 } 3063 3064 hdr->frame_control = fc; 3065 3066 memcpy(build.hdr + build.hdr_len, 3067 rfc1042_header, sizeof(rfc1042_header)); 3068 build.hdr_len += sizeof(rfc1042_header); 3069 3070 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3071 /* if the kmemdup fails, continue w/o fast_tx */ 3072 if (!fast_tx) 3073 goto out; 3074 3075 out: 3076 /* we might have raced against another call to this function */ 3077 old = rcu_dereference_protected(sta->fast_tx, 3078 lockdep_is_held(&sta->lock)); 3079 rcu_assign_pointer(sta->fast_tx, fast_tx); 3080 if (old) 3081 kfree_rcu(old, rcu_head); 3082 spin_unlock_bh(&sta->lock); 3083 } 3084 3085 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3086 { 3087 struct sta_info *sta; 3088 3089 rcu_read_lock(); 3090 list_for_each_entry_rcu(sta, &local->sta_list, list) 3091 ieee80211_check_fast_xmit(sta); 3092 rcu_read_unlock(); 3093 } 3094 3095 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3096 { 3097 struct ieee80211_local *local = sdata->local; 3098 struct sta_info *sta; 3099 3100 rcu_read_lock(); 3101 3102 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3103 if (sdata != sta->sdata && 3104 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3105 continue; 3106 ieee80211_check_fast_xmit(sta); 3107 } 3108 3109 rcu_read_unlock(); 3110 } 3111 3112 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3113 { 3114 struct ieee80211_fast_tx *fast_tx; 3115 3116 spin_lock_bh(&sta->lock); 3117 fast_tx = rcu_dereference_protected(sta->fast_tx, 3118 lockdep_is_held(&sta->lock)); 3119 RCU_INIT_POINTER(sta->fast_tx, NULL); 3120 spin_unlock_bh(&sta->lock); 3121 3122 if (fast_tx) 3123 kfree_rcu(fast_tx, rcu_head); 3124 } 3125 3126 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3127 struct sk_buff *skb, int headroom) 3128 { 3129 if (skb_headroom(skb) < headroom) { 3130 I802_DEBUG_INC(local->tx_expand_skb_head); 3131 3132 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3133 wiphy_debug(local->hw.wiphy, 3134 "failed to reallocate TX buffer\n"); 3135 return false; 3136 } 3137 } 3138 3139 return true; 3140 } 3141 3142 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3143 struct ieee80211_fast_tx *fast_tx, 3144 struct sk_buff *skb) 3145 { 3146 struct ieee80211_local *local = sdata->local; 3147 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3148 struct ieee80211_hdr *hdr; 3149 struct ethhdr *amsdu_hdr; 3150 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3151 int subframe_len = skb->len - hdr_len; 3152 void *data; 3153 u8 *qc, *h_80211_src, *h_80211_dst; 3154 const u8 *bssid; 3155 3156 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3157 return false; 3158 3159 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3160 return true; 3161 3162 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3163 return false; 3164 3165 data = skb_push(skb, sizeof(*amsdu_hdr)); 3166 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3167 hdr = data; 3168 amsdu_hdr = data + hdr_len; 3169 /* h_80211_src/dst is addr* field within hdr */ 3170 h_80211_src = data + fast_tx->sa_offs; 3171 h_80211_dst = data + fast_tx->da_offs; 3172 3173 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3174 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3175 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3176 3177 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3178 * fields needs to be changed to BSSID for A-MSDU frames depending 3179 * on FromDS/ToDS values. 3180 */ 3181 switch (sdata->vif.type) { 3182 case NL80211_IFTYPE_STATION: 3183 bssid = sdata->u.mgd.bssid; 3184 break; 3185 case NL80211_IFTYPE_AP: 3186 case NL80211_IFTYPE_AP_VLAN: 3187 bssid = sdata->vif.addr; 3188 break; 3189 default: 3190 bssid = NULL; 3191 } 3192 3193 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3194 ether_addr_copy(h_80211_src, bssid); 3195 3196 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3197 ether_addr_copy(h_80211_dst, bssid); 3198 3199 qc = ieee80211_get_qos_ctl(hdr); 3200 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3201 3202 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3203 3204 return true; 3205 } 3206 3207 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3208 struct sta_info *sta, 3209 struct ieee80211_fast_tx *fast_tx, 3210 struct sk_buff *skb) 3211 { 3212 struct ieee80211_local *local = sdata->local; 3213 struct fq *fq = &local->fq; 3214 struct fq_tin *tin; 3215 struct fq_flow *flow; 3216 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3217 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3218 struct txq_info *txqi; 3219 struct sk_buff **frag_tail, *head; 3220 int subframe_len = skb->len - ETH_ALEN; 3221 u8 max_subframes = sta->sta.max_amsdu_subframes; 3222 int max_frags = local->hw.max_tx_fragments; 3223 int max_amsdu_len = sta->sta.max_amsdu_len; 3224 u32 flow_idx; 3225 __be16 len; 3226 void *data; 3227 bool ret = false; 3228 unsigned int orig_len; 3229 int n = 2, nfrags, pad = 0; 3230 u16 hdrlen; 3231 3232 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3233 return false; 3234 3235 if (skb_is_gso(skb)) 3236 return false; 3237 3238 if (!txq) 3239 return false; 3240 3241 txqi = to_txq_info(txq); 3242 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3243 return false; 3244 3245 if (sta->sta.max_rc_amsdu_len) 3246 max_amsdu_len = min_t(int, max_amsdu_len, 3247 sta->sta.max_rc_amsdu_len); 3248 3249 if (sta->sta.max_tid_amsdu_len[tid]) 3250 max_amsdu_len = min_t(int, max_amsdu_len, 3251 sta->sta.max_tid_amsdu_len[tid]); 3252 3253 flow_idx = fq_flow_idx(fq, skb); 3254 3255 spin_lock_bh(&fq->lock); 3256 3257 /* TODO: Ideally aggregation should be done on dequeue to remain 3258 * responsive to environment changes. 3259 */ 3260 3261 tin = &txqi->tin; 3262 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3263 fq_flow_get_default_func); 3264 head = skb_peek_tail(&flow->queue); 3265 if (!head || skb_is_gso(head)) 3266 goto out; 3267 3268 orig_len = head->len; 3269 3270 if (skb->len + head->len > max_amsdu_len) 3271 goto out; 3272 3273 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3274 nfrags += 1 + skb_shinfo(head)->nr_frags; 3275 frag_tail = &skb_shinfo(head)->frag_list; 3276 while (*frag_tail) { 3277 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3278 frag_tail = &(*frag_tail)->next; 3279 n++; 3280 } 3281 3282 if (max_subframes && n > max_subframes) 3283 goto out; 3284 3285 if (max_frags && nfrags > max_frags) 3286 goto out; 3287 3288 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3289 goto out; 3290 3291 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3292 goto out; 3293 3294 /* 3295 * Pad out the previous subframe to a multiple of 4 by adding the 3296 * padding to the next one, that's being added. Note that head->len 3297 * is the length of the full A-MSDU, but that works since each time 3298 * we add a new subframe we pad out the previous one to a multiple 3299 * of 4 and thus it no longer matters in the next round. 3300 */ 3301 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3302 if ((head->len - hdrlen) & 3) 3303 pad = 4 - ((head->len - hdrlen) & 3); 3304 3305 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3306 2 + pad)) 3307 goto out_recalc; 3308 3309 ret = true; 3310 data = skb_push(skb, ETH_ALEN + 2); 3311 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3312 3313 data += 2 * ETH_ALEN; 3314 len = cpu_to_be16(subframe_len); 3315 memcpy(data, &len, 2); 3316 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3317 3318 memset(skb_push(skb, pad), 0, pad); 3319 3320 head->len += skb->len; 3321 head->data_len += skb->len; 3322 *frag_tail = skb; 3323 3324 out_recalc: 3325 if (head->len != orig_len) { 3326 flow->backlog += head->len - orig_len; 3327 tin->backlog_bytes += head->len - orig_len; 3328 3329 fq_recalc_backlog(fq, tin, flow); 3330 } 3331 out: 3332 spin_unlock_bh(&fq->lock); 3333 3334 return ret; 3335 } 3336 3337 /* 3338 * Can be called while the sta lock is held. Anything that can cause packets to 3339 * be generated will cause deadlock! 3340 */ 3341 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3342 struct sta_info *sta, u8 pn_offs, 3343 struct ieee80211_key *key, 3344 struct sk_buff *skb) 3345 { 3346 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3347 struct ieee80211_hdr *hdr = (void *)skb->data; 3348 u8 tid = IEEE80211_NUM_TIDS; 3349 3350 if (key) 3351 info->control.hw_key = &key->conf; 3352 3353 ieee80211_tx_stats(skb->dev, skb->len); 3354 3355 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3356 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3357 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3358 } else { 3359 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3360 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3361 sdata->sequence_number += 0x10; 3362 } 3363 3364 if (skb_shinfo(skb)->gso_size) 3365 sta->tx_stats.msdu[tid] += 3366 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3367 else 3368 sta->tx_stats.msdu[tid]++; 3369 3370 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3371 3372 /* statistics normally done by ieee80211_tx_h_stats (but that 3373 * has to consider fragmentation, so is more complex) 3374 */ 3375 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3376 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3377 3378 if (pn_offs) { 3379 u64 pn; 3380 u8 *crypto_hdr = skb->data + pn_offs; 3381 3382 switch (key->conf.cipher) { 3383 case WLAN_CIPHER_SUITE_CCMP: 3384 case WLAN_CIPHER_SUITE_CCMP_256: 3385 case WLAN_CIPHER_SUITE_GCMP: 3386 case WLAN_CIPHER_SUITE_GCMP_256: 3387 pn = atomic64_inc_return(&key->conf.tx_pn); 3388 crypto_hdr[0] = pn; 3389 crypto_hdr[1] = pn >> 8; 3390 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3391 crypto_hdr[4] = pn >> 16; 3392 crypto_hdr[5] = pn >> 24; 3393 crypto_hdr[6] = pn >> 32; 3394 crypto_hdr[7] = pn >> 40; 3395 break; 3396 } 3397 } 3398 } 3399 3400 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3401 struct sta_info *sta, 3402 struct ieee80211_fast_tx *fast_tx, 3403 struct sk_buff *skb) 3404 { 3405 struct ieee80211_local *local = sdata->local; 3406 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3407 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3408 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3409 struct ethhdr eth; 3410 struct ieee80211_tx_info *info; 3411 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3412 struct ieee80211_tx_data tx; 3413 ieee80211_tx_result r; 3414 struct tid_ampdu_tx *tid_tx = NULL; 3415 u8 tid = IEEE80211_NUM_TIDS; 3416 3417 /* control port protocol needs a lot of special handling */ 3418 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3419 return false; 3420 3421 /* only RFC 1042 SNAP */ 3422 if (ethertype < ETH_P_802_3_MIN) 3423 return false; 3424 3425 /* don't handle TX status request here either */ 3426 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3427 return false; 3428 3429 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3430 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3431 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3432 if (tid_tx) { 3433 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3434 return false; 3435 if (tid_tx->timeout) 3436 tid_tx->last_tx = jiffies; 3437 } 3438 } 3439 3440 /* after this point (skb is modified) we cannot return false */ 3441 3442 if (skb_shared(skb)) { 3443 struct sk_buff *tmp_skb = skb; 3444 3445 skb = skb_clone(skb, GFP_ATOMIC); 3446 kfree_skb(tmp_skb); 3447 3448 if (!skb) 3449 return true; 3450 } 3451 3452 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3453 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3454 return true; 3455 3456 /* will not be crypto-handled beyond what we do here, so use false 3457 * as the may-encrypt argument for the resize to not account for 3458 * more room than we already have in 'extra_head' 3459 */ 3460 if (unlikely(ieee80211_skb_resize(sdata, skb, 3461 max_t(int, extra_head + hw_headroom - 3462 skb_headroom(skb), 0), 3463 false))) { 3464 kfree_skb(skb); 3465 return true; 3466 } 3467 3468 memcpy(ð, skb->data, ETH_HLEN - 2); 3469 hdr = skb_push(skb, extra_head); 3470 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3471 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3472 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3473 3474 info = IEEE80211_SKB_CB(skb); 3475 memset(info, 0, sizeof(*info)); 3476 info->band = fast_tx->band; 3477 info->control.vif = &sdata->vif; 3478 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3479 IEEE80211_TX_CTL_DONTFRAG | 3480 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3481 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3482 3483 #ifdef CONFIG_MAC80211_DEBUGFS 3484 if (local->force_tx_status) 3485 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3486 #endif 3487 3488 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3489 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3490 *ieee80211_get_qos_ctl(hdr) = tid; 3491 } 3492 3493 __skb_queue_head_init(&tx.skbs); 3494 3495 tx.flags = IEEE80211_TX_UNICAST; 3496 tx.local = local; 3497 tx.sdata = sdata; 3498 tx.sta = sta; 3499 tx.key = fast_tx->key; 3500 3501 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3502 tx.skb = skb; 3503 r = ieee80211_tx_h_rate_ctrl(&tx); 3504 skb = tx.skb; 3505 tx.skb = NULL; 3506 3507 if (r != TX_CONTINUE) { 3508 if (r != TX_QUEUED) 3509 kfree_skb(skb); 3510 return true; 3511 } 3512 } 3513 3514 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3515 return true; 3516 3517 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3518 fast_tx->key, skb); 3519 3520 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3521 sdata = container_of(sdata->bss, 3522 struct ieee80211_sub_if_data, u.ap); 3523 3524 __skb_queue_tail(&tx.skbs, skb); 3525 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3526 return true; 3527 } 3528 3529 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3530 struct ieee80211_txq *txq) 3531 { 3532 struct ieee80211_local *local = hw_to_local(hw); 3533 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3534 struct ieee80211_hdr *hdr; 3535 struct sk_buff *skb = NULL; 3536 struct fq *fq = &local->fq; 3537 struct fq_tin *tin = &txqi->tin; 3538 struct ieee80211_tx_info *info; 3539 struct ieee80211_tx_data tx; 3540 ieee80211_tx_result r; 3541 struct ieee80211_vif *vif = txq->vif; 3542 3543 begin: 3544 spin_lock_bh(&fq->lock); 3545 3546 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3547 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3548 goto out; 3549 3550 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3551 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3552 goto out; 3553 } 3554 3555 /* Make sure fragments stay together. */ 3556 skb = __skb_dequeue(&txqi->frags); 3557 if (skb) 3558 goto out; 3559 3560 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3561 if (!skb) 3562 goto out; 3563 3564 spin_unlock_bh(&fq->lock); 3565 3566 hdr = (struct ieee80211_hdr *)skb->data; 3567 info = IEEE80211_SKB_CB(skb); 3568 3569 memset(&tx, 0, sizeof(tx)); 3570 __skb_queue_head_init(&tx.skbs); 3571 tx.local = local; 3572 tx.skb = skb; 3573 tx.sdata = vif_to_sdata(info->control.vif); 3574 3575 if (txq->sta) 3576 tx.sta = container_of(txq->sta, struct sta_info, sta); 3577 3578 /* 3579 * The key can be removed while the packet was queued, so need to call 3580 * this here to get the current key. 3581 */ 3582 r = ieee80211_tx_h_select_key(&tx); 3583 if (r != TX_CONTINUE) { 3584 ieee80211_free_txskb(&local->hw, skb); 3585 goto begin; 3586 } 3587 3588 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3589 info->flags |= IEEE80211_TX_CTL_AMPDU; 3590 else 3591 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3592 3593 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3594 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3595 sta); 3596 u8 pn_offs = 0; 3597 3598 if (tx.key && 3599 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3600 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3601 3602 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3603 tx.key, skb); 3604 } else { 3605 if (invoke_tx_handlers_late(&tx)) 3606 goto begin; 3607 3608 skb = __skb_dequeue(&tx.skbs); 3609 3610 if (!skb_queue_empty(&tx.skbs)) { 3611 spin_lock_bh(&fq->lock); 3612 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3613 spin_unlock_bh(&fq->lock); 3614 } 3615 } 3616 3617 if (skb_has_frag_list(skb) && 3618 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3619 if (skb_linearize(skb)) { 3620 ieee80211_free_txskb(&local->hw, skb); 3621 goto begin; 3622 } 3623 } 3624 3625 switch (tx.sdata->vif.type) { 3626 case NL80211_IFTYPE_MONITOR: 3627 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3628 vif = &tx.sdata->vif; 3629 break; 3630 } 3631 tx.sdata = rcu_dereference(local->monitor_sdata); 3632 if (tx.sdata) { 3633 vif = &tx.sdata->vif; 3634 info->hw_queue = 3635 vif->hw_queue[skb_get_queue_mapping(skb)]; 3636 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3637 ieee80211_free_txskb(&local->hw, skb); 3638 goto begin; 3639 } else { 3640 vif = NULL; 3641 } 3642 break; 3643 case NL80211_IFTYPE_AP_VLAN: 3644 tx.sdata = container_of(tx.sdata->bss, 3645 struct ieee80211_sub_if_data, u.ap); 3646 /* fall through */ 3647 default: 3648 vif = &tx.sdata->vif; 3649 break; 3650 } 3651 3652 IEEE80211_SKB_CB(skb)->control.vif = vif; 3653 return skb; 3654 3655 out: 3656 spin_unlock_bh(&fq->lock); 3657 3658 return skb; 3659 } 3660 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3661 3662 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3663 { 3664 struct ieee80211_local *local = hw_to_local(hw); 3665 struct txq_info *txqi = NULL; 3666 3667 lockdep_assert_held(&local->active_txq_lock[ac]); 3668 3669 begin: 3670 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3671 struct txq_info, 3672 schedule_order); 3673 if (!txqi) 3674 return NULL; 3675 3676 if (txqi->txq.sta) { 3677 struct sta_info *sta = container_of(txqi->txq.sta, 3678 struct sta_info, sta); 3679 3680 if (sta->airtime[txqi->txq.ac].deficit < 0) { 3681 sta->airtime[txqi->txq.ac].deficit += 3682 sta->airtime_weight; 3683 list_move_tail(&txqi->schedule_order, 3684 &local->active_txqs[txqi->txq.ac]); 3685 goto begin; 3686 } 3687 } 3688 3689 3690 if (txqi->schedule_round == local->schedule_round[ac]) 3691 return NULL; 3692 3693 list_del_init(&txqi->schedule_order); 3694 txqi->schedule_round = local->schedule_round[ac]; 3695 return &txqi->txq; 3696 } 3697 EXPORT_SYMBOL(ieee80211_next_txq); 3698 3699 void ieee80211_return_txq(struct ieee80211_hw *hw, 3700 struct ieee80211_txq *txq) 3701 { 3702 struct ieee80211_local *local = hw_to_local(hw); 3703 struct txq_info *txqi = to_txq_info(txq); 3704 3705 lockdep_assert_held(&local->active_txq_lock[txq->ac]); 3706 3707 if (list_empty(&txqi->schedule_order) && 3708 (!skb_queue_empty(&txqi->frags) || txqi->tin.backlog_packets)) { 3709 /* If airtime accounting is active, always enqueue STAs at the 3710 * head of the list to ensure that they only get moved to the 3711 * back by the airtime DRR scheduler once they have a negative 3712 * deficit. A station that already has a negative deficit will 3713 * get immediately moved to the back of the list on the next 3714 * call to ieee80211_next_txq(). 3715 */ 3716 if (txqi->txq.sta && 3717 wiphy_ext_feature_isset(local->hw.wiphy, 3718 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3719 list_add(&txqi->schedule_order, 3720 &local->active_txqs[txq->ac]); 3721 else 3722 list_add_tail(&txqi->schedule_order, 3723 &local->active_txqs[txq->ac]); 3724 } 3725 } 3726 EXPORT_SYMBOL(ieee80211_return_txq); 3727 3728 void ieee80211_schedule_txq(struct ieee80211_hw *hw, 3729 struct ieee80211_txq *txq) 3730 __acquires(txq_lock) __releases(txq_lock) 3731 { 3732 struct ieee80211_local *local = hw_to_local(hw); 3733 3734 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3735 ieee80211_return_txq(hw, txq); 3736 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3737 } 3738 EXPORT_SYMBOL(ieee80211_schedule_txq); 3739 3740 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3741 struct ieee80211_txq *txq) 3742 { 3743 struct ieee80211_local *local = hw_to_local(hw); 3744 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3745 struct sta_info *sta; 3746 u8 ac = txq->ac; 3747 3748 lockdep_assert_held(&local->active_txq_lock[ac]); 3749 3750 if (!txqi->txq.sta) 3751 goto out; 3752 3753 if (list_empty(&txqi->schedule_order)) 3754 goto out; 3755 3756 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3757 schedule_order) { 3758 if (iter == txqi) 3759 break; 3760 3761 if (!iter->txq.sta) { 3762 list_move_tail(&iter->schedule_order, 3763 &local->active_txqs[ac]); 3764 continue; 3765 } 3766 sta = container_of(iter->txq.sta, struct sta_info, sta); 3767 if (sta->airtime[ac].deficit < 0) 3768 sta->airtime[ac].deficit += sta->airtime_weight; 3769 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3770 } 3771 3772 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3773 if (sta->airtime[ac].deficit >= 0) 3774 goto out; 3775 3776 sta->airtime[ac].deficit += sta->airtime_weight; 3777 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3778 3779 return false; 3780 out: 3781 if (!list_empty(&txqi->schedule_order)) 3782 list_del_init(&txqi->schedule_order); 3783 3784 return true; 3785 } 3786 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3787 3788 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3789 __acquires(txq_lock) 3790 { 3791 struct ieee80211_local *local = hw_to_local(hw); 3792 3793 spin_lock_bh(&local->active_txq_lock[ac]); 3794 local->schedule_round[ac]++; 3795 } 3796 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3797 3798 void ieee80211_txq_schedule_end(struct ieee80211_hw *hw, u8 ac) 3799 __releases(txq_lock) 3800 { 3801 struct ieee80211_local *local = hw_to_local(hw); 3802 3803 spin_unlock_bh(&local->active_txq_lock[ac]); 3804 } 3805 EXPORT_SYMBOL(ieee80211_txq_schedule_end); 3806 3807 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3808 struct net_device *dev, 3809 u32 info_flags, 3810 u32 ctrl_flags) 3811 { 3812 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3813 struct ieee80211_local *local = sdata->local; 3814 struct sta_info *sta; 3815 struct sk_buff *next; 3816 3817 if (unlikely(skb->len < ETH_HLEN)) { 3818 kfree_skb(skb); 3819 return; 3820 } 3821 3822 rcu_read_lock(); 3823 3824 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3825 goto out_free; 3826 3827 if (IS_ERR(sta)) 3828 sta = NULL; 3829 3830 if (local->ops->wake_tx_queue) { 3831 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3832 skb_set_queue_mapping(skb, queue); 3833 } 3834 3835 if (sta) { 3836 struct ieee80211_fast_tx *fast_tx; 3837 3838 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3839 3840 fast_tx = rcu_dereference(sta->fast_tx); 3841 3842 if (fast_tx && 3843 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3844 goto out; 3845 } 3846 3847 if (skb_is_gso(skb)) { 3848 struct sk_buff *segs; 3849 3850 segs = skb_gso_segment(skb, 0); 3851 if (IS_ERR(segs)) { 3852 goto out_free; 3853 } else if (segs) { 3854 consume_skb(skb); 3855 skb = segs; 3856 } 3857 } else { 3858 /* we cannot process non-linear frames on this path */ 3859 if (skb_linearize(skb)) { 3860 kfree_skb(skb); 3861 goto out; 3862 } 3863 3864 /* the frame could be fragmented, software-encrypted, and other 3865 * things so we cannot really handle checksum offload with it - 3866 * fix it up in software before we handle anything else. 3867 */ 3868 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3869 skb_set_transport_header(skb, 3870 skb_checksum_start_offset(skb)); 3871 if (skb_checksum_help(skb)) 3872 goto out_free; 3873 } 3874 } 3875 3876 next = skb; 3877 while (next) { 3878 skb = next; 3879 next = skb->next; 3880 3881 skb->prev = NULL; 3882 skb->next = NULL; 3883 3884 skb = ieee80211_build_hdr(sdata, skb, info_flags, 3885 sta, ctrl_flags); 3886 if (IS_ERR(skb)) 3887 goto out; 3888 3889 ieee80211_tx_stats(dev, skb->len); 3890 3891 ieee80211_xmit(sdata, sta, skb, 0); 3892 } 3893 goto out; 3894 out_free: 3895 kfree_skb(skb); 3896 out: 3897 rcu_read_unlock(); 3898 } 3899 3900 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3901 { 3902 struct ethhdr *eth; 3903 int err; 3904 3905 err = skb_ensure_writable(skb, ETH_HLEN); 3906 if (unlikely(err)) 3907 return err; 3908 3909 eth = (void *)skb->data; 3910 ether_addr_copy(eth->h_dest, sta->sta.addr); 3911 3912 return 0; 3913 } 3914 3915 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3916 struct net_device *dev) 3917 { 3918 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3919 const struct ethhdr *eth = (void *)skb->data; 3920 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3921 __be16 ethertype; 3922 3923 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3924 return false; 3925 3926 switch (sdata->vif.type) { 3927 case NL80211_IFTYPE_AP_VLAN: 3928 if (sdata->u.vlan.sta) 3929 return false; 3930 if (sdata->wdev.use_4addr) 3931 return false; 3932 /* fall through */ 3933 case NL80211_IFTYPE_AP: 3934 /* check runtime toggle for this bss */ 3935 if (!sdata->bss->multicast_to_unicast) 3936 return false; 3937 break; 3938 default: 3939 return false; 3940 } 3941 3942 /* multicast to unicast conversion only for some payload */ 3943 ethertype = eth->h_proto; 3944 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3945 ethertype = ethvlan->h_vlan_encapsulated_proto; 3946 switch (ethertype) { 3947 case htons(ETH_P_ARP): 3948 case htons(ETH_P_IP): 3949 case htons(ETH_P_IPV6): 3950 break; 3951 default: 3952 return false; 3953 } 3954 3955 return true; 3956 } 3957 3958 static void 3959 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3960 struct sk_buff_head *queue) 3961 { 3962 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3963 struct ieee80211_local *local = sdata->local; 3964 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3965 struct sta_info *sta, *first = NULL; 3966 struct sk_buff *cloned_skb; 3967 3968 rcu_read_lock(); 3969 3970 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3971 if (sdata != sta->sdata) 3972 /* AP-VLAN mismatch */ 3973 continue; 3974 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3975 /* do not send back to source */ 3976 continue; 3977 if (!first) { 3978 first = sta; 3979 continue; 3980 } 3981 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3982 if (!cloned_skb) 3983 goto multicast; 3984 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3985 dev_kfree_skb(cloned_skb); 3986 goto multicast; 3987 } 3988 __skb_queue_tail(queue, cloned_skb); 3989 } 3990 3991 if (likely(first)) { 3992 if (unlikely(ieee80211_change_da(skb, first))) 3993 goto multicast; 3994 __skb_queue_tail(queue, skb); 3995 } else { 3996 /* no STA connected, drop */ 3997 kfree_skb(skb); 3998 skb = NULL; 3999 } 4000 4001 goto out; 4002 multicast: 4003 __skb_queue_purge(queue); 4004 __skb_queue_tail(queue, skb); 4005 out: 4006 rcu_read_unlock(); 4007 } 4008 4009 /** 4010 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4011 * @skb: packet to be sent 4012 * @dev: incoming interface 4013 * 4014 * On failure skb will be freed. 4015 */ 4016 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4017 struct net_device *dev) 4018 { 4019 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4020 struct sk_buff_head queue; 4021 4022 __skb_queue_head_init(&queue); 4023 ieee80211_convert_to_unicast(skb, dev, &queue); 4024 while ((skb = __skb_dequeue(&queue))) 4025 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4026 } else { 4027 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4028 } 4029 4030 return NETDEV_TX_OK; 4031 } 4032 4033 struct sk_buff * 4034 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4035 struct sk_buff *skb, u32 info_flags) 4036 { 4037 struct ieee80211_hdr *hdr; 4038 struct ieee80211_tx_data tx = { 4039 .local = sdata->local, 4040 .sdata = sdata, 4041 }; 4042 struct sta_info *sta; 4043 4044 rcu_read_lock(); 4045 4046 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4047 kfree_skb(skb); 4048 skb = ERR_PTR(-EINVAL); 4049 goto out; 4050 } 4051 4052 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0); 4053 if (IS_ERR(skb)) 4054 goto out; 4055 4056 hdr = (void *)skb->data; 4057 tx.sta = sta_info_get(sdata, hdr->addr1); 4058 tx.skb = skb; 4059 4060 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4061 rcu_read_unlock(); 4062 kfree_skb(skb); 4063 return ERR_PTR(-EINVAL); 4064 } 4065 4066 out: 4067 rcu_read_unlock(); 4068 return skb; 4069 } 4070 4071 /* 4072 * ieee80211_clear_tx_pending may not be called in a context where 4073 * it is possible that it packets could come in again. 4074 */ 4075 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4076 { 4077 struct sk_buff *skb; 4078 int i; 4079 4080 for (i = 0; i < local->hw.queues; i++) { 4081 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4082 ieee80211_free_txskb(&local->hw, skb); 4083 } 4084 } 4085 4086 /* 4087 * Returns false if the frame couldn't be transmitted but was queued instead, 4088 * which in this case means re-queued -- take as an indication to stop sending 4089 * more pending frames. 4090 */ 4091 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4092 struct sk_buff *skb) 4093 { 4094 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4095 struct ieee80211_sub_if_data *sdata; 4096 struct sta_info *sta; 4097 struct ieee80211_hdr *hdr; 4098 bool result; 4099 struct ieee80211_chanctx_conf *chanctx_conf; 4100 4101 sdata = vif_to_sdata(info->control.vif); 4102 4103 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 4104 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4105 if (unlikely(!chanctx_conf)) { 4106 dev_kfree_skb(skb); 4107 return true; 4108 } 4109 info->band = chanctx_conf->def.chan->band; 4110 result = ieee80211_tx(sdata, NULL, skb, true, 0); 4111 } else { 4112 struct sk_buff_head skbs; 4113 4114 __skb_queue_head_init(&skbs); 4115 __skb_queue_tail(&skbs, skb); 4116 4117 hdr = (struct ieee80211_hdr *)skb->data; 4118 sta = sta_info_get(sdata, hdr->addr1); 4119 4120 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4121 } 4122 4123 return result; 4124 } 4125 4126 /* 4127 * Transmit all pending packets. Called from tasklet. 4128 */ 4129 void ieee80211_tx_pending(unsigned long data) 4130 { 4131 struct ieee80211_local *local = (struct ieee80211_local *)data; 4132 unsigned long flags; 4133 int i; 4134 bool txok; 4135 4136 rcu_read_lock(); 4137 4138 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4139 for (i = 0; i < local->hw.queues; i++) { 4140 /* 4141 * If queue is stopped by something other than due to pending 4142 * frames, or we have no pending frames, proceed to next queue. 4143 */ 4144 if (local->queue_stop_reasons[i] || 4145 skb_queue_empty(&local->pending[i])) 4146 continue; 4147 4148 while (!skb_queue_empty(&local->pending[i])) { 4149 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4150 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4151 4152 if (WARN_ON(!info->control.vif)) { 4153 ieee80211_free_txskb(&local->hw, skb); 4154 continue; 4155 } 4156 4157 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4158 flags); 4159 4160 txok = ieee80211_tx_pending_skb(local, skb); 4161 spin_lock_irqsave(&local->queue_stop_reason_lock, 4162 flags); 4163 if (!txok) 4164 break; 4165 } 4166 4167 if (skb_queue_empty(&local->pending[i])) 4168 ieee80211_propagate_queue_wake(local, i); 4169 } 4170 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4171 4172 rcu_read_unlock(); 4173 } 4174 4175 /* functions for drivers to get certain frames */ 4176 4177 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4178 struct ps_data *ps, struct sk_buff *skb, 4179 bool is_template) 4180 { 4181 u8 *pos, *tim; 4182 int aid0 = 0; 4183 int i, have_bits = 0, n1, n2; 4184 4185 /* Generate bitmap for TIM only if there are any STAs in power save 4186 * mode. */ 4187 if (atomic_read(&ps->num_sta_ps) > 0) 4188 /* in the hope that this is faster than 4189 * checking byte-for-byte */ 4190 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4191 IEEE80211_MAX_AID+1); 4192 if (!is_template) { 4193 if (ps->dtim_count == 0) 4194 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4195 else 4196 ps->dtim_count--; 4197 } 4198 4199 tim = pos = skb_put(skb, 6); 4200 *pos++ = WLAN_EID_TIM; 4201 *pos++ = 4; 4202 *pos++ = ps->dtim_count; 4203 *pos++ = sdata->vif.bss_conf.dtim_period; 4204 4205 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4206 aid0 = 1; 4207 4208 ps->dtim_bc_mc = aid0 == 1; 4209 4210 if (have_bits) { 4211 /* Find largest even number N1 so that bits numbered 1 through 4212 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4213 * (N2 + 1) x 8 through 2007 are 0. */ 4214 n1 = 0; 4215 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4216 if (ps->tim[i]) { 4217 n1 = i & 0xfe; 4218 break; 4219 } 4220 } 4221 n2 = n1; 4222 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4223 if (ps->tim[i]) { 4224 n2 = i; 4225 break; 4226 } 4227 } 4228 4229 /* Bitmap control */ 4230 *pos++ = n1 | aid0; 4231 /* Part Virt Bitmap */ 4232 skb_put(skb, n2 - n1); 4233 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4234 4235 tim[1] = n2 - n1 + 4; 4236 } else { 4237 *pos++ = aid0; /* Bitmap control */ 4238 *pos++ = 0; /* Part Virt Bitmap */ 4239 } 4240 } 4241 4242 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4243 struct ps_data *ps, struct sk_buff *skb, 4244 bool is_template) 4245 { 4246 struct ieee80211_local *local = sdata->local; 4247 4248 /* 4249 * Not very nice, but we want to allow the driver to call 4250 * ieee80211_beacon_get() as a response to the set_tim() 4251 * callback. That, however, is already invoked under the 4252 * sta_lock to guarantee consistent and race-free update 4253 * of the tim bitmap in mac80211 and the driver. 4254 */ 4255 if (local->tim_in_locked_section) { 4256 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4257 } else { 4258 spin_lock_bh(&local->tim_lock); 4259 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4260 spin_unlock_bh(&local->tim_lock); 4261 } 4262 4263 return 0; 4264 } 4265 4266 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4267 struct beacon_data *beacon) 4268 { 4269 struct probe_resp *resp; 4270 u8 *beacon_data; 4271 size_t beacon_data_len; 4272 int i; 4273 u8 count = beacon->csa_current_counter; 4274 4275 switch (sdata->vif.type) { 4276 case NL80211_IFTYPE_AP: 4277 beacon_data = beacon->tail; 4278 beacon_data_len = beacon->tail_len; 4279 break; 4280 case NL80211_IFTYPE_ADHOC: 4281 beacon_data = beacon->head; 4282 beacon_data_len = beacon->head_len; 4283 break; 4284 case NL80211_IFTYPE_MESH_POINT: 4285 beacon_data = beacon->head; 4286 beacon_data_len = beacon->head_len; 4287 break; 4288 default: 4289 return; 4290 } 4291 4292 rcu_read_lock(); 4293 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4294 resp = rcu_dereference(sdata->u.ap.probe_resp); 4295 4296 if (beacon->csa_counter_offsets[i]) { 4297 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4298 beacon_data_len)) { 4299 rcu_read_unlock(); 4300 return; 4301 } 4302 4303 beacon_data[beacon->csa_counter_offsets[i]] = count; 4304 } 4305 4306 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4307 resp->data[resp->csa_counter_offsets[i]] = count; 4308 } 4309 rcu_read_unlock(); 4310 } 4311 4312 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4313 { 4314 beacon->csa_current_counter--; 4315 4316 /* the counter should never reach 0 */ 4317 WARN_ON_ONCE(!beacon->csa_current_counter); 4318 4319 return beacon->csa_current_counter; 4320 } 4321 4322 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4323 { 4324 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4325 struct beacon_data *beacon = NULL; 4326 u8 count = 0; 4327 4328 rcu_read_lock(); 4329 4330 if (sdata->vif.type == NL80211_IFTYPE_AP) 4331 beacon = rcu_dereference(sdata->u.ap.beacon); 4332 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4333 beacon = rcu_dereference(sdata->u.ibss.presp); 4334 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4335 beacon = rcu_dereference(sdata->u.mesh.beacon); 4336 4337 if (!beacon) 4338 goto unlock; 4339 4340 count = __ieee80211_csa_update_counter(beacon); 4341 4342 unlock: 4343 rcu_read_unlock(); 4344 return count; 4345 } 4346 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4347 4348 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4349 { 4350 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4351 struct beacon_data *beacon = NULL; 4352 4353 rcu_read_lock(); 4354 4355 if (sdata->vif.type == NL80211_IFTYPE_AP) 4356 beacon = rcu_dereference(sdata->u.ap.beacon); 4357 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4358 beacon = rcu_dereference(sdata->u.ibss.presp); 4359 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4360 beacon = rcu_dereference(sdata->u.mesh.beacon); 4361 4362 if (!beacon) 4363 goto unlock; 4364 4365 if (counter < beacon->csa_current_counter) 4366 beacon->csa_current_counter = counter; 4367 4368 unlock: 4369 rcu_read_unlock(); 4370 } 4371 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4372 4373 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4374 { 4375 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4376 struct beacon_data *beacon = NULL; 4377 u8 *beacon_data; 4378 size_t beacon_data_len; 4379 int ret = false; 4380 4381 if (!ieee80211_sdata_running(sdata)) 4382 return false; 4383 4384 rcu_read_lock(); 4385 if (vif->type == NL80211_IFTYPE_AP) { 4386 struct ieee80211_if_ap *ap = &sdata->u.ap; 4387 4388 beacon = rcu_dereference(ap->beacon); 4389 if (WARN_ON(!beacon || !beacon->tail)) 4390 goto out; 4391 beacon_data = beacon->tail; 4392 beacon_data_len = beacon->tail_len; 4393 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4394 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4395 4396 beacon = rcu_dereference(ifibss->presp); 4397 if (!beacon) 4398 goto out; 4399 4400 beacon_data = beacon->head; 4401 beacon_data_len = beacon->head_len; 4402 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4403 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4404 4405 beacon = rcu_dereference(ifmsh->beacon); 4406 if (!beacon) 4407 goto out; 4408 4409 beacon_data = beacon->head; 4410 beacon_data_len = beacon->head_len; 4411 } else { 4412 WARN_ON(1); 4413 goto out; 4414 } 4415 4416 if (!beacon->csa_counter_offsets[0]) 4417 goto out; 4418 4419 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4420 goto out; 4421 4422 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4423 ret = true; 4424 out: 4425 rcu_read_unlock(); 4426 4427 return ret; 4428 } 4429 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4430 4431 static struct sk_buff * 4432 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4433 struct ieee80211_vif *vif, 4434 struct ieee80211_mutable_offsets *offs, 4435 bool is_template) 4436 { 4437 struct ieee80211_local *local = hw_to_local(hw); 4438 struct beacon_data *beacon = NULL; 4439 struct sk_buff *skb = NULL; 4440 struct ieee80211_tx_info *info; 4441 struct ieee80211_sub_if_data *sdata = NULL; 4442 enum nl80211_band band; 4443 struct ieee80211_tx_rate_control txrc; 4444 struct ieee80211_chanctx_conf *chanctx_conf; 4445 int csa_off_base = 0; 4446 4447 rcu_read_lock(); 4448 4449 sdata = vif_to_sdata(vif); 4450 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4451 4452 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4453 goto out; 4454 4455 if (offs) 4456 memset(offs, 0, sizeof(*offs)); 4457 4458 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4459 struct ieee80211_if_ap *ap = &sdata->u.ap; 4460 4461 beacon = rcu_dereference(ap->beacon); 4462 if (beacon) { 4463 if (beacon->csa_counter_offsets[0]) { 4464 if (!is_template) 4465 __ieee80211_csa_update_counter(beacon); 4466 4467 ieee80211_set_csa(sdata, beacon); 4468 } 4469 4470 /* 4471 * headroom, head length, 4472 * tail length and maximum TIM length 4473 */ 4474 skb = dev_alloc_skb(local->tx_headroom + 4475 beacon->head_len + 4476 beacon->tail_len + 256 + 4477 local->hw.extra_beacon_tailroom); 4478 if (!skb) 4479 goto out; 4480 4481 skb_reserve(skb, local->tx_headroom); 4482 skb_put_data(skb, beacon->head, beacon->head_len); 4483 4484 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4485 is_template); 4486 4487 if (offs) { 4488 offs->tim_offset = beacon->head_len; 4489 offs->tim_length = skb->len - beacon->head_len; 4490 4491 /* for AP the csa offsets are from tail */ 4492 csa_off_base = skb->len; 4493 } 4494 4495 if (beacon->tail) 4496 skb_put_data(skb, beacon->tail, 4497 beacon->tail_len); 4498 } else 4499 goto out; 4500 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4501 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4502 struct ieee80211_hdr *hdr; 4503 4504 beacon = rcu_dereference(ifibss->presp); 4505 if (!beacon) 4506 goto out; 4507 4508 if (beacon->csa_counter_offsets[0]) { 4509 if (!is_template) 4510 __ieee80211_csa_update_counter(beacon); 4511 4512 ieee80211_set_csa(sdata, beacon); 4513 } 4514 4515 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4516 local->hw.extra_beacon_tailroom); 4517 if (!skb) 4518 goto out; 4519 skb_reserve(skb, local->tx_headroom); 4520 skb_put_data(skb, beacon->head, beacon->head_len); 4521 4522 hdr = (struct ieee80211_hdr *) skb->data; 4523 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4524 IEEE80211_STYPE_BEACON); 4525 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4526 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4527 4528 beacon = rcu_dereference(ifmsh->beacon); 4529 if (!beacon) 4530 goto out; 4531 4532 if (beacon->csa_counter_offsets[0]) { 4533 if (!is_template) 4534 /* TODO: For mesh csa_counter is in TU, so 4535 * decrementing it by one isn't correct, but 4536 * for now we leave it consistent with overall 4537 * mac80211's behavior. 4538 */ 4539 __ieee80211_csa_update_counter(beacon); 4540 4541 ieee80211_set_csa(sdata, beacon); 4542 } 4543 4544 if (ifmsh->sync_ops) 4545 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4546 4547 skb = dev_alloc_skb(local->tx_headroom + 4548 beacon->head_len + 4549 256 + /* TIM IE */ 4550 beacon->tail_len + 4551 local->hw.extra_beacon_tailroom); 4552 if (!skb) 4553 goto out; 4554 skb_reserve(skb, local->tx_headroom); 4555 skb_put_data(skb, beacon->head, beacon->head_len); 4556 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4557 4558 if (offs) { 4559 offs->tim_offset = beacon->head_len; 4560 offs->tim_length = skb->len - beacon->head_len; 4561 } 4562 4563 skb_put_data(skb, beacon->tail, beacon->tail_len); 4564 } else { 4565 WARN_ON(1); 4566 goto out; 4567 } 4568 4569 /* CSA offsets */ 4570 if (offs && beacon) { 4571 int i; 4572 4573 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4574 u16 csa_off = beacon->csa_counter_offsets[i]; 4575 4576 if (!csa_off) 4577 continue; 4578 4579 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4580 } 4581 } 4582 4583 band = chanctx_conf->def.chan->band; 4584 4585 info = IEEE80211_SKB_CB(skb); 4586 4587 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4588 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4589 info->band = band; 4590 4591 memset(&txrc, 0, sizeof(txrc)); 4592 txrc.hw = hw; 4593 txrc.sband = local->hw.wiphy->bands[band]; 4594 txrc.bss_conf = &sdata->vif.bss_conf; 4595 txrc.skb = skb; 4596 txrc.reported_rate.idx = -1; 4597 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4598 txrc.bss = true; 4599 rate_control_get_rate(sdata, NULL, &txrc); 4600 4601 info->control.vif = vif; 4602 4603 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4604 IEEE80211_TX_CTL_ASSIGN_SEQ | 4605 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4606 out: 4607 rcu_read_unlock(); 4608 return skb; 4609 4610 } 4611 4612 struct sk_buff * 4613 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4614 struct ieee80211_vif *vif, 4615 struct ieee80211_mutable_offsets *offs) 4616 { 4617 return __ieee80211_beacon_get(hw, vif, offs, true); 4618 } 4619 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4620 4621 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4622 struct ieee80211_vif *vif, 4623 u16 *tim_offset, u16 *tim_length) 4624 { 4625 struct ieee80211_mutable_offsets offs = {}; 4626 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4627 struct sk_buff *copy; 4628 struct ieee80211_supported_band *sband; 4629 int shift; 4630 4631 if (!bcn) 4632 return bcn; 4633 4634 if (tim_offset) 4635 *tim_offset = offs.tim_offset; 4636 4637 if (tim_length) 4638 *tim_length = offs.tim_length; 4639 4640 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4641 !hw_to_local(hw)->monitors) 4642 return bcn; 4643 4644 /* send a copy to monitor interfaces */ 4645 copy = skb_copy(bcn, GFP_ATOMIC); 4646 if (!copy) 4647 return bcn; 4648 4649 shift = ieee80211_vif_get_shift(vif); 4650 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4651 if (!sband) 4652 return bcn; 4653 4654 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4655 4656 return bcn; 4657 } 4658 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4659 4660 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4661 struct ieee80211_vif *vif) 4662 { 4663 struct ieee80211_if_ap *ap = NULL; 4664 struct sk_buff *skb = NULL; 4665 struct probe_resp *presp = NULL; 4666 struct ieee80211_hdr *hdr; 4667 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4668 4669 if (sdata->vif.type != NL80211_IFTYPE_AP) 4670 return NULL; 4671 4672 rcu_read_lock(); 4673 4674 ap = &sdata->u.ap; 4675 presp = rcu_dereference(ap->probe_resp); 4676 if (!presp) 4677 goto out; 4678 4679 skb = dev_alloc_skb(presp->len); 4680 if (!skb) 4681 goto out; 4682 4683 skb_put_data(skb, presp->data, presp->len); 4684 4685 hdr = (struct ieee80211_hdr *) skb->data; 4686 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4687 4688 out: 4689 rcu_read_unlock(); 4690 return skb; 4691 } 4692 EXPORT_SYMBOL(ieee80211_proberesp_get); 4693 4694 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4695 struct ieee80211_vif *vif) 4696 { 4697 struct ieee80211_sub_if_data *sdata; 4698 struct ieee80211_if_managed *ifmgd; 4699 struct ieee80211_pspoll *pspoll; 4700 struct ieee80211_local *local; 4701 struct sk_buff *skb; 4702 4703 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4704 return NULL; 4705 4706 sdata = vif_to_sdata(vif); 4707 ifmgd = &sdata->u.mgd; 4708 local = sdata->local; 4709 4710 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4711 if (!skb) 4712 return NULL; 4713 4714 skb_reserve(skb, local->hw.extra_tx_headroom); 4715 4716 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4717 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4718 IEEE80211_STYPE_PSPOLL); 4719 pspoll->aid = cpu_to_le16(ifmgd->aid); 4720 4721 /* aid in PS-Poll has its two MSBs each set to 1 */ 4722 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4723 4724 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4725 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4726 4727 return skb; 4728 } 4729 EXPORT_SYMBOL(ieee80211_pspoll_get); 4730 4731 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4732 struct ieee80211_vif *vif, 4733 bool qos_ok) 4734 { 4735 struct ieee80211_hdr_3addr *nullfunc; 4736 struct ieee80211_sub_if_data *sdata; 4737 struct ieee80211_if_managed *ifmgd; 4738 struct ieee80211_local *local; 4739 struct sk_buff *skb; 4740 bool qos = false; 4741 4742 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4743 return NULL; 4744 4745 sdata = vif_to_sdata(vif); 4746 ifmgd = &sdata->u.mgd; 4747 local = sdata->local; 4748 4749 if (qos_ok) { 4750 struct sta_info *sta; 4751 4752 rcu_read_lock(); 4753 sta = sta_info_get(sdata, ifmgd->bssid); 4754 qos = sta && sta->sta.wme; 4755 rcu_read_unlock(); 4756 } 4757 4758 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4759 sizeof(*nullfunc) + 2); 4760 if (!skb) 4761 return NULL; 4762 4763 skb_reserve(skb, local->hw.extra_tx_headroom); 4764 4765 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4766 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4767 IEEE80211_STYPE_NULLFUNC | 4768 IEEE80211_FCTL_TODS); 4769 if (qos) { 4770 __le16 qoshdr = cpu_to_le16(7); 4771 4772 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4773 IEEE80211_STYPE_NULLFUNC) != 4774 IEEE80211_STYPE_QOS_NULLFUNC); 4775 nullfunc->frame_control |= 4776 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4777 skb->priority = 7; 4778 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4779 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 4780 } 4781 4782 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4783 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4784 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4785 4786 return skb; 4787 } 4788 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4789 4790 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4791 const u8 *src_addr, 4792 const u8 *ssid, size_t ssid_len, 4793 size_t tailroom) 4794 { 4795 struct ieee80211_local *local = hw_to_local(hw); 4796 struct ieee80211_hdr_3addr *hdr; 4797 struct sk_buff *skb; 4798 size_t ie_ssid_len; 4799 u8 *pos; 4800 4801 ie_ssid_len = 2 + ssid_len; 4802 4803 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4804 ie_ssid_len + tailroom); 4805 if (!skb) 4806 return NULL; 4807 4808 skb_reserve(skb, local->hw.extra_tx_headroom); 4809 4810 hdr = skb_put_zero(skb, sizeof(*hdr)); 4811 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4812 IEEE80211_STYPE_PROBE_REQ); 4813 eth_broadcast_addr(hdr->addr1); 4814 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4815 eth_broadcast_addr(hdr->addr3); 4816 4817 pos = skb_put(skb, ie_ssid_len); 4818 *pos++ = WLAN_EID_SSID; 4819 *pos++ = ssid_len; 4820 if (ssid_len) 4821 memcpy(pos, ssid, ssid_len); 4822 pos += ssid_len; 4823 4824 return skb; 4825 } 4826 EXPORT_SYMBOL(ieee80211_probereq_get); 4827 4828 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4829 const void *frame, size_t frame_len, 4830 const struct ieee80211_tx_info *frame_txctl, 4831 struct ieee80211_rts *rts) 4832 { 4833 const struct ieee80211_hdr *hdr = frame; 4834 4835 rts->frame_control = 4836 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4837 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4838 frame_txctl); 4839 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4840 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4841 } 4842 EXPORT_SYMBOL(ieee80211_rts_get); 4843 4844 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4845 const void *frame, size_t frame_len, 4846 const struct ieee80211_tx_info *frame_txctl, 4847 struct ieee80211_cts *cts) 4848 { 4849 const struct ieee80211_hdr *hdr = frame; 4850 4851 cts->frame_control = 4852 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4853 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4854 frame_len, frame_txctl); 4855 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4856 } 4857 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4858 4859 struct sk_buff * 4860 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4861 struct ieee80211_vif *vif) 4862 { 4863 struct ieee80211_local *local = hw_to_local(hw); 4864 struct sk_buff *skb = NULL; 4865 struct ieee80211_tx_data tx; 4866 struct ieee80211_sub_if_data *sdata; 4867 struct ps_data *ps; 4868 struct ieee80211_tx_info *info; 4869 struct ieee80211_chanctx_conf *chanctx_conf; 4870 4871 sdata = vif_to_sdata(vif); 4872 4873 rcu_read_lock(); 4874 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4875 4876 if (!chanctx_conf) 4877 goto out; 4878 4879 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4880 struct beacon_data *beacon = 4881 rcu_dereference(sdata->u.ap.beacon); 4882 4883 if (!beacon || !beacon->head) 4884 goto out; 4885 4886 ps = &sdata->u.ap.ps; 4887 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4888 ps = &sdata->u.mesh.ps; 4889 } else { 4890 goto out; 4891 } 4892 4893 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4894 goto out; /* send buffered bc/mc only after DTIM beacon */ 4895 4896 while (1) { 4897 skb = skb_dequeue(&ps->bc_buf); 4898 if (!skb) 4899 goto out; 4900 local->total_ps_buffered--; 4901 4902 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4903 struct ieee80211_hdr *hdr = 4904 (struct ieee80211_hdr *) skb->data; 4905 /* more buffered multicast/broadcast frames ==> set 4906 * MoreData flag in IEEE 802.11 header to inform PS 4907 * STAs */ 4908 hdr->frame_control |= 4909 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4910 } 4911 4912 if (sdata->vif.type == NL80211_IFTYPE_AP) 4913 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4914 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4915 break; 4916 ieee80211_free_txskb(hw, skb); 4917 } 4918 4919 info = IEEE80211_SKB_CB(skb); 4920 4921 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4922 info->band = chanctx_conf->def.chan->band; 4923 4924 if (invoke_tx_handlers(&tx)) 4925 skb = NULL; 4926 out: 4927 rcu_read_unlock(); 4928 4929 return skb; 4930 } 4931 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4932 4933 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4934 { 4935 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4936 struct ieee80211_sub_if_data *sdata = sta->sdata; 4937 struct ieee80211_local *local = sdata->local; 4938 int ret; 4939 u32 queues; 4940 4941 lockdep_assert_held(&local->sta_mtx); 4942 4943 /* only some cases are supported right now */ 4944 switch (sdata->vif.type) { 4945 case NL80211_IFTYPE_STATION: 4946 case NL80211_IFTYPE_AP: 4947 case NL80211_IFTYPE_AP_VLAN: 4948 break; 4949 default: 4950 WARN_ON(1); 4951 return -EINVAL; 4952 } 4953 4954 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4955 return -EINVAL; 4956 4957 if (sta->reserved_tid == tid) { 4958 ret = 0; 4959 goto out; 4960 } 4961 4962 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4963 sdata_err(sdata, "TID reservation already active\n"); 4964 ret = -EALREADY; 4965 goto out; 4966 } 4967 4968 ieee80211_stop_vif_queues(sdata->local, sdata, 4969 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4970 4971 synchronize_net(); 4972 4973 /* Tear down BA sessions so we stop aggregating on this TID */ 4974 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4975 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4976 __ieee80211_stop_tx_ba_session(sta, tid, 4977 AGG_STOP_LOCAL_REQUEST); 4978 } 4979 4980 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4981 __ieee80211_flush_queues(local, sdata, queues, false); 4982 4983 sta->reserved_tid = tid; 4984 4985 ieee80211_wake_vif_queues(local, sdata, 4986 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4987 4988 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4989 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4990 4991 ret = 0; 4992 out: 4993 return ret; 4994 } 4995 EXPORT_SYMBOL(ieee80211_reserve_tid); 4996 4997 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4998 { 4999 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5000 struct ieee80211_sub_if_data *sdata = sta->sdata; 5001 5002 lockdep_assert_held(&sdata->local->sta_mtx); 5003 5004 /* only some cases are supported right now */ 5005 switch (sdata->vif.type) { 5006 case NL80211_IFTYPE_STATION: 5007 case NL80211_IFTYPE_AP: 5008 case NL80211_IFTYPE_AP_VLAN: 5009 break; 5010 default: 5011 WARN_ON(1); 5012 return; 5013 } 5014 5015 if (tid != sta->reserved_tid) { 5016 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5017 return; 5018 } 5019 5020 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5021 } 5022 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5023 5024 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5025 struct sk_buff *skb, int tid, 5026 enum nl80211_band band, u32 txdata_flags) 5027 { 5028 int ac = ieee80211_ac_from_tid(tid); 5029 5030 skb_reset_mac_header(skb); 5031 skb_set_queue_mapping(skb, ac); 5032 skb->priority = tid; 5033 5034 skb->dev = sdata->dev; 5035 5036 /* 5037 * The other path calling ieee80211_xmit is from the tasklet, 5038 * and while we can handle concurrent transmissions locking 5039 * requirements are that we do not come into tx with bhs on. 5040 */ 5041 local_bh_disable(); 5042 IEEE80211_SKB_CB(skb)->band = band; 5043 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 5044 local_bh_enable(); 5045 } 5046 5047 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5048 const u8 *buf, size_t len, 5049 const u8 *dest, __be16 proto, bool unencrypted) 5050 { 5051 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5052 struct ieee80211_local *local = sdata->local; 5053 struct sk_buff *skb; 5054 struct ethhdr *ehdr; 5055 u32 flags; 5056 5057 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5058 * or Pre-Authentication 5059 */ 5060 if (proto != sdata->control_port_protocol && 5061 proto != cpu_to_be16(ETH_P_PREAUTH)) 5062 return -EINVAL; 5063 5064 if (unencrypted) 5065 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 5066 else 5067 flags = 0; 5068 5069 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5070 sizeof(struct ethhdr) + len); 5071 if (!skb) 5072 return -ENOMEM; 5073 5074 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5075 5076 skb_put_data(skb, buf, len); 5077 5078 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5079 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5080 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5081 ehdr->h_proto = proto; 5082 5083 skb->dev = dev; 5084 skb->protocol = htons(ETH_P_802_3); 5085 skb_reset_network_header(skb); 5086 skb_reset_mac_header(skb); 5087 5088 local_bh_disable(); 5089 __ieee80211_subif_start_xmit(skb, skb->dev, flags, 0); 5090 local_bh_enable(); 5091 5092 return 0; 5093 } 5094