1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2020 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 42 { 43 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 44 45 u64_stats_update_begin(&tstats->syncp); 46 tstats->tx_packets++; 47 tstats->tx_bytes += len; 48 u64_stats_update_end(&tstats->syncp); 49 } 50 51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 52 struct sk_buff *skb, int group_addr, 53 int next_frag_len) 54 { 55 int rate, mrate, erp, dur, i, shift = 0; 56 struct ieee80211_rate *txrate; 57 struct ieee80211_local *local = tx->local; 58 struct ieee80211_supported_band *sband; 59 struct ieee80211_hdr *hdr; 60 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 61 struct ieee80211_chanctx_conf *chanctx_conf; 62 u32 rate_flags = 0; 63 64 /* assume HW handles this */ 65 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 66 return 0; 67 68 rcu_read_lock(); 69 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 70 if (chanctx_conf) { 71 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 72 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 73 } 74 rcu_read_unlock(); 75 76 /* uh huh? */ 77 if (WARN_ON_ONCE(tx->rate.idx < 0)) 78 return 0; 79 80 sband = local->hw.wiphy->bands[info->band]; 81 txrate = &sband->bitrates[tx->rate.idx]; 82 83 erp = txrate->flags & IEEE80211_RATE_ERP_G; 84 85 /* 86 * data and mgmt (except PS Poll): 87 * - during CFP: 32768 88 * - during contention period: 89 * if addr1 is group address: 0 90 * if more fragments = 0 and addr1 is individual address: time to 91 * transmit one ACK plus SIFS 92 * if more fragments = 1 and addr1 is individual address: time to 93 * transmit next fragment plus 2 x ACK plus 3 x SIFS 94 * 95 * IEEE 802.11, 9.6: 96 * - control response frame (CTS or ACK) shall be transmitted using the 97 * same rate as the immediately previous frame in the frame exchange 98 * sequence, if this rate belongs to the PHY mandatory rates, or else 99 * at the highest possible rate belonging to the PHY rates in the 100 * BSSBasicRateSet 101 */ 102 hdr = (struct ieee80211_hdr *)skb->data; 103 if (ieee80211_is_ctl(hdr->frame_control)) { 104 /* TODO: These control frames are not currently sent by 105 * mac80211, but should they be implemented, this function 106 * needs to be updated to support duration field calculation. 107 * 108 * RTS: time needed to transmit pending data/mgmt frame plus 109 * one CTS frame plus one ACK frame plus 3 x SIFS 110 * CTS: duration of immediately previous RTS minus time 111 * required to transmit CTS and its SIFS 112 * ACK: 0 if immediately previous directed data/mgmt had 113 * more=0, with more=1 duration in ACK frame is duration 114 * from previous frame minus time needed to transmit ACK 115 * and its SIFS 116 * PS Poll: BIT(15) | BIT(14) | aid 117 */ 118 return 0; 119 } 120 121 /* data/mgmt */ 122 if (0 /* FIX: data/mgmt during CFP */) 123 return cpu_to_le16(32768); 124 125 if (group_addr) /* Group address as the destination - no ACK */ 126 return 0; 127 128 /* Individual destination address: 129 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 130 * CTS and ACK frames shall be transmitted using the highest rate in 131 * basic rate set that is less than or equal to the rate of the 132 * immediately previous frame and that is using the same modulation 133 * (CCK or OFDM). If no basic rate set matches with these requirements, 134 * the highest mandatory rate of the PHY that is less than or equal to 135 * the rate of the previous frame is used. 136 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 137 */ 138 rate = -1; 139 /* use lowest available if everything fails */ 140 mrate = sband->bitrates[0].bitrate; 141 for (i = 0; i < sband->n_bitrates; i++) { 142 struct ieee80211_rate *r = &sband->bitrates[i]; 143 144 if (r->bitrate > txrate->bitrate) 145 break; 146 147 if ((rate_flags & r->flags) != rate_flags) 148 continue; 149 150 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 151 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 152 153 switch (sband->band) { 154 case NL80211_BAND_2GHZ: { 155 u32 flag; 156 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 157 flag = IEEE80211_RATE_MANDATORY_G; 158 else 159 flag = IEEE80211_RATE_MANDATORY_B; 160 if (r->flags & flag) 161 mrate = r->bitrate; 162 break; 163 } 164 case NL80211_BAND_5GHZ: 165 case NL80211_BAND_6GHZ: 166 if (r->flags & IEEE80211_RATE_MANDATORY_A) 167 mrate = r->bitrate; 168 break; 169 case NL80211_BAND_S1GHZ: 170 case NL80211_BAND_60GHZ: 171 /* TODO, for now fall through */ 172 case NUM_NL80211_BANDS: 173 WARN_ON(1); 174 break; 175 } 176 } 177 if (rate == -1) { 178 /* No matching basic rate found; use highest suitable mandatory 179 * PHY rate */ 180 rate = DIV_ROUND_UP(mrate, 1 << shift); 181 } 182 183 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 184 if (ieee80211_is_data_qos(hdr->frame_control) && 185 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 186 dur = 0; 187 else 188 /* Time needed to transmit ACK 189 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 190 * to closest integer */ 191 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 192 tx->sdata->vif.bss_conf.use_short_preamble, 193 shift); 194 195 if (next_frag_len) { 196 /* Frame is fragmented: duration increases with time needed to 197 * transmit next fragment plus ACK and 2 x SIFS. */ 198 dur *= 2; /* ACK + SIFS */ 199 /* next fragment */ 200 dur += ieee80211_frame_duration(sband->band, next_frag_len, 201 txrate->bitrate, erp, 202 tx->sdata->vif.bss_conf.use_short_preamble, 203 shift); 204 } 205 206 return cpu_to_le16(dur); 207 } 208 209 /* tx handlers */ 210 static ieee80211_tx_result debug_noinline 211 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 212 { 213 struct ieee80211_local *local = tx->local; 214 struct ieee80211_if_managed *ifmgd; 215 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 216 217 /* driver doesn't support power save */ 218 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 219 return TX_CONTINUE; 220 221 /* hardware does dynamic power save */ 222 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 223 return TX_CONTINUE; 224 225 /* dynamic power save disabled */ 226 if (local->hw.conf.dynamic_ps_timeout <= 0) 227 return TX_CONTINUE; 228 229 /* we are scanning, don't enable power save */ 230 if (local->scanning) 231 return TX_CONTINUE; 232 233 if (!local->ps_sdata) 234 return TX_CONTINUE; 235 236 /* No point if we're going to suspend */ 237 if (local->quiescing) 238 return TX_CONTINUE; 239 240 /* dynamic ps is supported only in managed mode */ 241 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 242 return TX_CONTINUE; 243 244 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 245 return TX_CONTINUE; 246 247 ifmgd = &tx->sdata->u.mgd; 248 249 /* 250 * Don't wakeup from power save if u-apsd is enabled, voip ac has 251 * u-apsd enabled and the frame is in voip class. This effectively 252 * means that even if all access categories have u-apsd enabled, in 253 * practise u-apsd is only used with the voip ac. This is a 254 * workaround for the case when received voip class packets do not 255 * have correct qos tag for some reason, due the network or the 256 * peer application. 257 * 258 * Note: ifmgd->uapsd_queues access is racy here. If the value is 259 * changed via debugfs, user needs to reassociate manually to have 260 * everything in sync. 261 */ 262 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 263 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 264 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 265 return TX_CONTINUE; 266 267 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 268 ieee80211_stop_queues_by_reason(&local->hw, 269 IEEE80211_MAX_QUEUE_MAP, 270 IEEE80211_QUEUE_STOP_REASON_PS, 271 false); 272 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 273 ieee80211_queue_work(&local->hw, 274 &local->dynamic_ps_disable_work); 275 } 276 277 /* Don't restart the timer if we're not disassociated */ 278 if (!ifmgd->associated) 279 return TX_CONTINUE; 280 281 mod_timer(&local->dynamic_ps_timer, jiffies + 282 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 283 284 return TX_CONTINUE; 285 } 286 287 static ieee80211_tx_result debug_noinline 288 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 289 { 290 291 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 292 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 293 bool assoc = false; 294 295 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 296 return TX_CONTINUE; 297 298 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 299 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 300 !ieee80211_is_probe_req(hdr->frame_control) && 301 !ieee80211_is_any_nullfunc(hdr->frame_control)) 302 /* 303 * When software scanning only nullfunc frames (to notify 304 * the sleep state to the AP) and probe requests (for the 305 * active scan) are allowed, all other frames should not be 306 * sent and we should not get here, but if we do 307 * nonetheless, drop them to avoid sending them 308 * off-channel. See the link below and 309 * ieee80211_start_scan() for more. 310 * 311 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 312 */ 313 return TX_DROP; 314 315 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 316 return TX_CONTINUE; 317 318 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 319 return TX_CONTINUE; 320 321 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 322 return TX_CONTINUE; 323 324 if (tx->sta) 325 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 326 327 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 328 if (unlikely(!assoc && 329 ieee80211_is_data(hdr->frame_control))) { 330 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 331 sdata_info(tx->sdata, 332 "dropped data frame to not associated station %pM\n", 333 hdr->addr1); 334 #endif 335 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 336 return TX_DROP; 337 } 338 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 339 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 340 /* 341 * No associated STAs - no need to send multicast 342 * frames. 343 */ 344 return TX_DROP; 345 } 346 347 return TX_CONTINUE; 348 } 349 350 /* This function is called whenever the AP is about to exceed the maximum limit 351 * of buffered frames for power saving STAs. This situation should not really 352 * happen often during normal operation, so dropping the oldest buffered packet 353 * from each queue should be OK to make some room for new frames. */ 354 static void purge_old_ps_buffers(struct ieee80211_local *local) 355 { 356 int total = 0, purged = 0; 357 struct sk_buff *skb; 358 struct ieee80211_sub_if_data *sdata; 359 struct sta_info *sta; 360 361 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 362 struct ps_data *ps; 363 364 if (sdata->vif.type == NL80211_IFTYPE_AP) 365 ps = &sdata->u.ap.ps; 366 else if (ieee80211_vif_is_mesh(&sdata->vif)) 367 ps = &sdata->u.mesh.ps; 368 else 369 continue; 370 371 skb = skb_dequeue(&ps->bc_buf); 372 if (skb) { 373 purged++; 374 ieee80211_free_txskb(&local->hw, skb); 375 } 376 total += skb_queue_len(&ps->bc_buf); 377 } 378 379 /* 380 * Drop one frame from each station from the lowest-priority 381 * AC that has frames at all. 382 */ 383 list_for_each_entry_rcu(sta, &local->sta_list, list) { 384 int ac; 385 386 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 387 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 388 total += skb_queue_len(&sta->ps_tx_buf[ac]); 389 if (skb) { 390 purged++; 391 ieee80211_free_txskb(&local->hw, skb); 392 break; 393 } 394 } 395 } 396 397 local->total_ps_buffered = total; 398 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 399 } 400 401 static ieee80211_tx_result 402 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 403 { 404 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 405 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 406 struct ps_data *ps; 407 408 /* 409 * broadcast/multicast frame 410 * 411 * If any of the associated/peer stations is in power save mode, 412 * the frame is buffered to be sent after DTIM beacon frame. 413 * This is done either by the hardware or us. 414 */ 415 416 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 417 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 418 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 419 if (!tx->sdata->bss) 420 return TX_CONTINUE; 421 422 ps = &tx->sdata->bss->ps; 423 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 424 ps = &tx->sdata->u.mesh.ps; 425 } else { 426 return TX_CONTINUE; 427 } 428 429 430 /* no buffering for ordered frames */ 431 if (ieee80211_has_order(hdr->frame_control)) 432 return TX_CONTINUE; 433 434 if (ieee80211_is_probe_req(hdr->frame_control)) 435 return TX_CONTINUE; 436 437 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 438 info->hw_queue = tx->sdata->vif.cab_queue; 439 440 /* no stations in PS mode and no buffered packets */ 441 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 442 return TX_CONTINUE; 443 444 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 445 446 /* device releases frame after DTIM beacon */ 447 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 448 return TX_CONTINUE; 449 450 /* buffered in mac80211 */ 451 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 452 purge_old_ps_buffers(tx->local); 453 454 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 455 ps_dbg(tx->sdata, 456 "BC TX buffer full - dropping the oldest frame\n"); 457 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 458 } else 459 tx->local->total_ps_buffered++; 460 461 skb_queue_tail(&ps->bc_buf, tx->skb); 462 463 return TX_QUEUED; 464 } 465 466 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 467 struct sk_buff *skb) 468 { 469 if (!ieee80211_is_mgmt(fc)) 470 return 0; 471 472 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 473 return 0; 474 475 if (!ieee80211_is_robust_mgmt_frame(skb)) 476 return 0; 477 478 return 1; 479 } 480 481 static ieee80211_tx_result 482 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 483 { 484 struct sta_info *sta = tx->sta; 485 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 486 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 487 struct ieee80211_local *local = tx->local; 488 489 if (unlikely(!sta)) 490 return TX_CONTINUE; 491 492 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 493 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 494 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 495 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 496 int ac = skb_get_queue_mapping(tx->skb); 497 498 if (ieee80211_is_mgmt(hdr->frame_control) && 499 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 500 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 501 return TX_CONTINUE; 502 } 503 504 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 505 sta->sta.addr, sta->sta.aid, ac); 506 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 507 purge_old_ps_buffers(tx->local); 508 509 /* sync with ieee80211_sta_ps_deliver_wakeup */ 510 spin_lock(&sta->ps_lock); 511 /* 512 * STA woke up the meantime and all the frames on ps_tx_buf have 513 * been queued to pending queue. No reordering can happen, go 514 * ahead and Tx the packet. 515 */ 516 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 517 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 518 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 519 spin_unlock(&sta->ps_lock); 520 return TX_CONTINUE; 521 } 522 523 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 524 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 525 ps_dbg(tx->sdata, 526 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 527 sta->sta.addr, ac); 528 ieee80211_free_txskb(&local->hw, old); 529 } else 530 tx->local->total_ps_buffered++; 531 532 info->control.jiffies = jiffies; 533 info->control.vif = &tx->sdata->vif; 534 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 535 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 536 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 537 spin_unlock(&sta->ps_lock); 538 539 if (!timer_pending(&local->sta_cleanup)) 540 mod_timer(&local->sta_cleanup, 541 round_jiffies(jiffies + 542 STA_INFO_CLEANUP_INTERVAL)); 543 544 /* 545 * We queued up some frames, so the TIM bit might 546 * need to be set, recalculate it. 547 */ 548 sta_info_recalc_tim(sta); 549 550 return TX_QUEUED; 551 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 552 ps_dbg(tx->sdata, 553 "STA %pM in PS mode, but polling/in SP -> send frame\n", 554 sta->sta.addr); 555 } 556 557 return TX_CONTINUE; 558 } 559 560 static ieee80211_tx_result debug_noinline 561 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 562 { 563 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 564 return TX_CONTINUE; 565 566 if (tx->flags & IEEE80211_TX_UNICAST) 567 return ieee80211_tx_h_unicast_ps_buf(tx); 568 else 569 return ieee80211_tx_h_multicast_ps_buf(tx); 570 } 571 572 static ieee80211_tx_result debug_noinline 573 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 574 { 575 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 576 577 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 578 if (tx->sdata->control_port_no_encrypt) 579 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 580 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 581 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 582 } 583 584 return TX_CONTINUE; 585 } 586 587 static ieee80211_tx_result debug_noinline 588 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 589 { 590 struct ieee80211_key *key; 591 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 592 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 593 594 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 595 tx->key = NULL; 596 return TX_CONTINUE; 597 } 598 599 if (tx->sta && 600 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 601 tx->key = key; 602 else if (ieee80211_is_group_privacy_action(tx->skb) && 603 (key = rcu_dereference(tx->sdata->default_multicast_key))) 604 tx->key = key; 605 else if (ieee80211_is_mgmt(hdr->frame_control) && 606 is_multicast_ether_addr(hdr->addr1) && 607 ieee80211_is_robust_mgmt_frame(tx->skb) && 608 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 609 tx->key = key; 610 else if (is_multicast_ether_addr(hdr->addr1) && 611 (key = rcu_dereference(tx->sdata->default_multicast_key))) 612 tx->key = key; 613 else if (!is_multicast_ether_addr(hdr->addr1) && 614 (key = rcu_dereference(tx->sdata->default_unicast_key))) 615 tx->key = key; 616 else 617 tx->key = NULL; 618 619 if (tx->key) { 620 bool skip_hw = false; 621 622 /* TODO: add threshold stuff again */ 623 624 switch (tx->key->conf.cipher) { 625 case WLAN_CIPHER_SUITE_WEP40: 626 case WLAN_CIPHER_SUITE_WEP104: 627 case WLAN_CIPHER_SUITE_TKIP: 628 if (!ieee80211_is_data_present(hdr->frame_control)) 629 tx->key = NULL; 630 break; 631 case WLAN_CIPHER_SUITE_CCMP: 632 case WLAN_CIPHER_SUITE_CCMP_256: 633 case WLAN_CIPHER_SUITE_GCMP: 634 case WLAN_CIPHER_SUITE_GCMP_256: 635 if (!ieee80211_is_data_present(hdr->frame_control) && 636 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 637 tx->skb) && 638 !ieee80211_is_group_privacy_action(tx->skb)) 639 tx->key = NULL; 640 else 641 skip_hw = (tx->key->conf.flags & 642 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 643 ieee80211_is_mgmt(hdr->frame_control); 644 break; 645 case WLAN_CIPHER_SUITE_AES_CMAC: 646 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 647 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 648 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 649 if (!ieee80211_is_mgmt(hdr->frame_control)) 650 tx->key = NULL; 651 break; 652 } 653 654 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 655 !ieee80211_is_deauth(hdr->frame_control))) 656 return TX_DROP; 657 658 if (!skip_hw && tx->key && 659 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 660 info->control.hw_key = &tx->key->conf; 661 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta && 662 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 663 return TX_DROP; 664 } 665 666 return TX_CONTINUE; 667 } 668 669 static ieee80211_tx_result debug_noinline 670 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 671 { 672 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 673 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 674 struct ieee80211_supported_band *sband; 675 u32 len; 676 struct ieee80211_tx_rate_control txrc; 677 struct ieee80211_sta_rates *ratetbl = NULL; 678 bool assoc = false; 679 680 memset(&txrc, 0, sizeof(txrc)); 681 682 sband = tx->local->hw.wiphy->bands[info->band]; 683 684 len = min_t(u32, tx->skb->len + FCS_LEN, 685 tx->local->hw.wiphy->frag_threshold); 686 687 /* set up the tx rate control struct we give the RC algo */ 688 txrc.hw = &tx->local->hw; 689 txrc.sband = sband; 690 txrc.bss_conf = &tx->sdata->vif.bss_conf; 691 txrc.skb = tx->skb; 692 txrc.reported_rate.idx = -1; 693 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 694 695 if (tx->sdata->rc_has_mcs_mask[info->band]) 696 txrc.rate_idx_mcs_mask = 697 tx->sdata->rc_rateidx_mcs_mask[info->band]; 698 699 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 700 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 701 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 702 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 703 704 /* set up RTS protection if desired */ 705 if (len > tx->local->hw.wiphy->rts_threshold) { 706 txrc.rts = true; 707 } 708 709 info->control.use_rts = txrc.rts; 710 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 711 712 /* 713 * Use short preamble if the BSS can handle it, but not for 714 * management frames unless we know the receiver can handle 715 * that -- the management frame might be to a station that 716 * just wants a probe response. 717 */ 718 if (tx->sdata->vif.bss_conf.use_short_preamble && 719 (ieee80211_is_data(hdr->frame_control) || 720 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 721 txrc.short_preamble = true; 722 723 info->control.short_preamble = txrc.short_preamble; 724 725 /* don't ask rate control when rate already injected via radiotap */ 726 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 727 return TX_CONTINUE; 728 729 if (tx->sta) 730 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 731 732 /* 733 * Lets not bother rate control if we're associated and cannot 734 * talk to the sta. This should not happen. 735 */ 736 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 737 !rate_usable_index_exists(sband, &tx->sta->sta), 738 "%s: Dropped data frame as no usable bitrate found while " 739 "scanning and associated. Target station: " 740 "%pM on %d GHz band\n", 741 tx->sdata->name, hdr->addr1, 742 info->band ? 5 : 2)) 743 return TX_DROP; 744 745 /* 746 * If we're associated with the sta at this point we know we can at 747 * least send the frame at the lowest bit rate. 748 */ 749 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 750 751 if (tx->sta && !info->control.skip_table) 752 ratetbl = rcu_dereference(tx->sta->sta.rates); 753 754 if (unlikely(info->control.rates[0].idx < 0)) { 755 if (ratetbl) { 756 struct ieee80211_tx_rate rate = { 757 .idx = ratetbl->rate[0].idx, 758 .flags = ratetbl->rate[0].flags, 759 .count = ratetbl->rate[0].count 760 }; 761 762 if (ratetbl->rate[0].idx < 0) 763 return TX_DROP; 764 765 tx->rate = rate; 766 } else { 767 return TX_DROP; 768 } 769 } else { 770 tx->rate = info->control.rates[0]; 771 } 772 773 if (txrc.reported_rate.idx < 0) { 774 txrc.reported_rate = tx->rate; 775 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 776 tx->sta->tx_stats.last_rate = txrc.reported_rate; 777 } else if (tx->sta) 778 tx->sta->tx_stats.last_rate = txrc.reported_rate; 779 780 if (ratetbl) 781 return TX_CONTINUE; 782 783 if (unlikely(!info->control.rates[0].count)) 784 info->control.rates[0].count = 1; 785 786 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 787 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 788 info->control.rates[0].count = 1; 789 790 return TX_CONTINUE; 791 } 792 793 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 794 { 795 u16 *seq = &sta->tid_seq[tid]; 796 __le16 ret = cpu_to_le16(*seq); 797 798 /* Increase the sequence number. */ 799 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 800 801 return ret; 802 } 803 804 static ieee80211_tx_result debug_noinline 805 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 806 { 807 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 808 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 809 int tid; 810 811 /* 812 * Packet injection may want to control the sequence 813 * number, if we have no matching interface then we 814 * neither assign one ourselves nor ask the driver to. 815 */ 816 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 817 return TX_CONTINUE; 818 819 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 820 return TX_CONTINUE; 821 822 if (ieee80211_hdrlen(hdr->frame_control) < 24) 823 return TX_CONTINUE; 824 825 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 826 return TX_CONTINUE; 827 828 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 829 return TX_CONTINUE; 830 831 /* 832 * Anything but QoS data that has a sequence number field 833 * (is long enough) gets a sequence number from the global 834 * counter. QoS data frames with a multicast destination 835 * also use the global counter (802.11-2012 9.3.2.10). 836 */ 837 if (!ieee80211_is_data_qos(hdr->frame_control) || 838 is_multicast_ether_addr(hdr->addr1)) { 839 /* driver should assign sequence number */ 840 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 841 /* for pure STA mode without beacons, we can do it */ 842 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 843 tx->sdata->sequence_number += 0x10; 844 if (tx->sta) 845 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 846 return TX_CONTINUE; 847 } 848 849 /* 850 * This should be true for injected/management frames only, for 851 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 852 * above since they are not QoS-data frames. 853 */ 854 if (!tx->sta) 855 return TX_CONTINUE; 856 857 /* include per-STA, per-TID sequence counter */ 858 tid = ieee80211_get_tid(hdr); 859 tx->sta->tx_stats.msdu[tid]++; 860 861 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 862 863 return TX_CONTINUE; 864 } 865 866 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 867 struct sk_buff *skb, int hdrlen, 868 int frag_threshold) 869 { 870 struct ieee80211_local *local = tx->local; 871 struct ieee80211_tx_info *info; 872 struct sk_buff *tmp; 873 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 874 int pos = hdrlen + per_fragm; 875 int rem = skb->len - hdrlen - per_fragm; 876 877 if (WARN_ON(rem < 0)) 878 return -EINVAL; 879 880 /* first fragment was already added to queue by caller */ 881 882 while (rem) { 883 int fraglen = per_fragm; 884 885 if (fraglen > rem) 886 fraglen = rem; 887 rem -= fraglen; 888 tmp = dev_alloc_skb(local->tx_headroom + 889 frag_threshold + 890 tx->sdata->encrypt_headroom + 891 IEEE80211_ENCRYPT_TAILROOM); 892 if (!tmp) 893 return -ENOMEM; 894 895 __skb_queue_tail(&tx->skbs, tmp); 896 897 skb_reserve(tmp, 898 local->tx_headroom + tx->sdata->encrypt_headroom); 899 900 /* copy control information */ 901 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 902 903 info = IEEE80211_SKB_CB(tmp); 904 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 905 IEEE80211_TX_CTL_FIRST_FRAGMENT); 906 907 if (rem) 908 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 909 910 skb_copy_queue_mapping(tmp, skb); 911 tmp->priority = skb->priority; 912 tmp->dev = skb->dev; 913 914 /* copy header and data */ 915 skb_put_data(tmp, skb->data, hdrlen); 916 skb_put_data(tmp, skb->data + pos, fraglen); 917 918 pos += fraglen; 919 } 920 921 /* adjust first fragment's length */ 922 skb_trim(skb, hdrlen + per_fragm); 923 return 0; 924 } 925 926 static ieee80211_tx_result debug_noinline 927 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 928 { 929 struct sk_buff *skb = tx->skb; 930 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 931 struct ieee80211_hdr *hdr = (void *)skb->data; 932 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 933 int hdrlen; 934 int fragnum; 935 936 /* no matter what happens, tx->skb moves to tx->skbs */ 937 __skb_queue_tail(&tx->skbs, skb); 938 tx->skb = NULL; 939 940 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 941 return TX_CONTINUE; 942 943 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 944 return TX_CONTINUE; 945 946 /* 947 * Warn when submitting a fragmented A-MPDU frame and drop it. 948 * This scenario is handled in ieee80211_tx_prepare but extra 949 * caution taken here as fragmented ampdu may cause Tx stop. 950 */ 951 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 952 return TX_DROP; 953 954 hdrlen = ieee80211_hdrlen(hdr->frame_control); 955 956 /* internal error, why isn't DONTFRAG set? */ 957 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 958 return TX_DROP; 959 960 /* 961 * Now fragment the frame. This will allocate all the fragments and 962 * chain them (using skb as the first fragment) to skb->next. 963 * During transmission, we will remove the successfully transmitted 964 * fragments from this list. When the low-level driver rejects one 965 * of the fragments then we will simply pretend to accept the skb 966 * but store it away as pending. 967 */ 968 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 969 return TX_DROP; 970 971 /* update duration/seq/flags of fragments */ 972 fragnum = 0; 973 974 skb_queue_walk(&tx->skbs, skb) { 975 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 976 977 hdr = (void *)skb->data; 978 info = IEEE80211_SKB_CB(skb); 979 980 if (!skb_queue_is_last(&tx->skbs, skb)) { 981 hdr->frame_control |= morefrags; 982 /* 983 * No multi-rate retries for fragmented frames, that 984 * would completely throw off the NAV at other STAs. 985 */ 986 info->control.rates[1].idx = -1; 987 info->control.rates[2].idx = -1; 988 info->control.rates[3].idx = -1; 989 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 990 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 991 } else { 992 hdr->frame_control &= ~morefrags; 993 } 994 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 995 fragnum++; 996 } 997 998 return TX_CONTINUE; 999 } 1000 1001 static ieee80211_tx_result debug_noinline 1002 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1003 { 1004 struct sk_buff *skb; 1005 int ac = -1; 1006 1007 if (!tx->sta) 1008 return TX_CONTINUE; 1009 1010 skb_queue_walk(&tx->skbs, skb) { 1011 ac = skb_get_queue_mapping(skb); 1012 tx->sta->tx_stats.bytes[ac] += skb->len; 1013 } 1014 if (ac >= 0) 1015 tx->sta->tx_stats.packets[ac]++; 1016 1017 return TX_CONTINUE; 1018 } 1019 1020 static ieee80211_tx_result debug_noinline 1021 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1022 { 1023 if (!tx->key) 1024 return TX_CONTINUE; 1025 1026 switch (tx->key->conf.cipher) { 1027 case WLAN_CIPHER_SUITE_WEP40: 1028 case WLAN_CIPHER_SUITE_WEP104: 1029 return ieee80211_crypto_wep_encrypt(tx); 1030 case WLAN_CIPHER_SUITE_TKIP: 1031 return ieee80211_crypto_tkip_encrypt(tx); 1032 case WLAN_CIPHER_SUITE_CCMP: 1033 return ieee80211_crypto_ccmp_encrypt( 1034 tx, IEEE80211_CCMP_MIC_LEN); 1035 case WLAN_CIPHER_SUITE_CCMP_256: 1036 return ieee80211_crypto_ccmp_encrypt( 1037 tx, IEEE80211_CCMP_256_MIC_LEN); 1038 case WLAN_CIPHER_SUITE_AES_CMAC: 1039 return ieee80211_crypto_aes_cmac_encrypt(tx); 1040 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1041 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1042 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1043 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1044 return ieee80211_crypto_aes_gmac_encrypt(tx); 1045 case WLAN_CIPHER_SUITE_GCMP: 1046 case WLAN_CIPHER_SUITE_GCMP_256: 1047 return ieee80211_crypto_gcmp_encrypt(tx); 1048 default: 1049 return ieee80211_crypto_hw_encrypt(tx); 1050 } 1051 1052 return TX_DROP; 1053 } 1054 1055 static ieee80211_tx_result debug_noinline 1056 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1057 { 1058 struct sk_buff *skb; 1059 struct ieee80211_hdr *hdr; 1060 int next_len; 1061 bool group_addr; 1062 1063 skb_queue_walk(&tx->skbs, skb) { 1064 hdr = (void *) skb->data; 1065 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1066 break; /* must not overwrite AID */ 1067 if (!skb_queue_is_last(&tx->skbs, skb)) { 1068 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1069 next_len = next->len; 1070 } else 1071 next_len = 0; 1072 group_addr = is_multicast_ether_addr(hdr->addr1); 1073 1074 hdr->duration_id = 1075 ieee80211_duration(tx, skb, group_addr, next_len); 1076 } 1077 1078 return TX_CONTINUE; 1079 } 1080 1081 /* actual transmit path */ 1082 1083 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1084 struct sk_buff *skb, 1085 struct ieee80211_tx_info *info, 1086 struct tid_ampdu_tx *tid_tx, 1087 int tid) 1088 { 1089 bool queued = false; 1090 bool reset_agg_timer = false; 1091 struct sk_buff *purge_skb = NULL; 1092 1093 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1094 info->flags |= IEEE80211_TX_CTL_AMPDU; 1095 reset_agg_timer = true; 1096 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1097 /* 1098 * nothing -- this aggregation session is being started 1099 * but that might still fail with the driver 1100 */ 1101 } else if (!tx->sta->sta.txq[tid]) { 1102 spin_lock(&tx->sta->lock); 1103 /* 1104 * Need to re-check now, because we may get here 1105 * 1106 * 1) in the window during which the setup is actually 1107 * already done, but not marked yet because not all 1108 * packets are spliced over to the driver pending 1109 * queue yet -- if this happened we acquire the lock 1110 * either before or after the splice happens, but 1111 * need to recheck which of these cases happened. 1112 * 1113 * 2) during session teardown, if the OPERATIONAL bit 1114 * was cleared due to the teardown but the pointer 1115 * hasn't been assigned NULL yet (or we loaded it 1116 * before it was assigned) -- in this case it may 1117 * now be NULL which means we should just let the 1118 * packet pass through because splicing the frames 1119 * back is already done. 1120 */ 1121 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1122 1123 if (!tid_tx) { 1124 /* do nothing, let packet pass through */ 1125 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1126 info->flags |= IEEE80211_TX_CTL_AMPDU; 1127 reset_agg_timer = true; 1128 } else { 1129 queued = true; 1130 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1131 clear_sta_flag(tx->sta, WLAN_STA_SP); 1132 ps_dbg(tx->sta->sdata, 1133 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1134 tx->sta->sta.addr, tx->sta->sta.aid); 1135 } 1136 info->control.vif = &tx->sdata->vif; 1137 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1138 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1139 __skb_queue_tail(&tid_tx->pending, skb); 1140 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1141 purge_skb = __skb_dequeue(&tid_tx->pending); 1142 } 1143 spin_unlock(&tx->sta->lock); 1144 1145 if (purge_skb) 1146 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1147 } 1148 1149 /* reset session timer */ 1150 if (reset_agg_timer) 1151 tid_tx->last_tx = jiffies; 1152 1153 return queued; 1154 } 1155 1156 /* 1157 * initialises @tx 1158 * pass %NULL for the station if unknown, a valid pointer if known 1159 * or an ERR_PTR() if the station is known not to exist 1160 */ 1161 static ieee80211_tx_result 1162 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1163 struct ieee80211_tx_data *tx, 1164 struct sta_info *sta, struct sk_buff *skb) 1165 { 1166 struct ieee80211_local *local = sdata->local; 1167 struct ieee80211_hdr *hdr; 1168 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1169 int tid; 1170 1171 memset(tx, 0, sizeof(*tx)); 1172 tx->skb = skb; 1173 tx->local = local; 1174 tx->sdata = sdata; 1175 __skb_queue_head_init(&tx->skbs); 1176 1177 /* 1178 * If this flag is set to true anywhere, and we get here, 1179 * we are doing the needed processing, so remove the flag 1180 * now. 1181 */ 1182 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1183 1184 hdr = (struct ieee80211_hdr *) skb->data; 1185 1186 if (likely(sta)) { 1187 if (!IS_ERR(sta)) 1188 tx->sta = sta; 1189 } else { 1190 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1191 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1192 if (!tx->sta && sdata->wdev.use_4addr) 1193 return TX_DROP; 1194 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1195 IEEE80211_TX_CTL_INJECTED) || 1196 tx->sdata->control_port_protocol == tx->skb->protocol) { 1197 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1198 } 1199 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1200 tx->sta = sta_info_get(sdata, hdr->addr1); 1201 } 1202 1203 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1204 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1205 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1206 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1207 struct tid_ampdu_tx *tid_tx; 1208 1209 tid = ieee80211_get_tid(hdr); 1210 1211 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1212 if (tid_tx) { 1213 bool queued; 1214 1215 queued = ieee80211_tx_prep_agg(tx, skb, info, 1216 tid_tx, tid); 1217 1218 if (unlikely(queued)) 1219 return TX_QUEUED; 1220 } 1221 } 1222 1223 if (is_multicast_ether_addr(hdr->addr1)) { 1224 tx->flags &= ~IEEE80211_TX_UNICAST; 1225 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1226 } else 1227 tx->flags |= IEEE80211_TX_UNICAST; 1228 1229 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1230 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1231 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1232 info->flags & IEEE80211_TX_CTL_AMPDU) 1233 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1234 } 1235 1236 if (!tx->sta) 1237 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1238 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1239 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1240 ieee80211_check_fast_xmit(tx->sta); 1241 } 1242 1243 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1244 1245 return TX_CONTINUE; 1246 } 1247 1248 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1249 struct ieee80211_vif *vif, 1250 struct sta_info *sta, 1251 struct sk_buff *skb) 1252 { 1253 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1254 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1255 struct ieee80211_txq *txq = NULL; 1256 1257 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1258 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1259 return NULL; 1260 1261 if (!(info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) && 1262 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1263 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1264 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1265 vif->type == NL80211_IFTYPE_STATION) && 1266 sta && sta->uploaded) { 1267 /* 1268 * This will be NULL if the driver didn't set the 1269 * opt-in hardware flag. 1270 */ 1271 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1272 } 1273 } else if (sta) { 1274 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1275 1276 if (!sta->uploaded) 1277 return NULL; 1278 1279 txq = sta->sta.txq[tid]; 1280 } else if (vif) { 1281 txq = vif->txq; 1282 } 1283 1284 if (!txq) 1285 return NULL; 1286 1287 return to_txq_info(txq); 1288 } 1289 1290 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1291 { 1292 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1293 } 1294 1295 static u32 codel_skb_len_func(const struct sk_buff *skb) 1296 { 1297 return skb->len; 1298 } 1299 1300 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1301 { 1302 const struct ieee80211_tx_info *info; 1303 1304 info = (const struct ieee80211_tx_info *)skb->cb; 1305 return info->control.enqueue_time; 1306 } 1307 1308 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1309 void *ctx) 1310 { 1311 struct ieee80211_local *local; 1312 struct txq_info *txqi; 1313 struct fq *fq; 1314 struct fq_flow *flow; 1315 1316 txqi = ctx; 1317 local = vif_to_sdata(txqi->txq.vif)->local; 1318 fq = &local->fq; 1319 1320 if (cvars == &txqi->def_cvars) 1321 flow = &txqi->def_flow; 1322 else 1323 flow = &fq->flows[cvars - local->cvars]; 1324 1325 return fq_flow_dequeue(fq, flow); 1326 } 1327 1328 static void codel_drop_func(struct sk_buff *skb, 1329 void *ctx) 1330 { 1331 struct ieee80211_local *local; 1332 struct ieee80211_hw *hw; 1333 struct txq_info *txqi; 1334 1335 txqi = ctx; 1336 local = vif_to_sdata(txqi->txq.vif)->local; 1337 hw = &local->hw; 1338 1339 ieee80211_free_txskb(hw, skb); 1340 } 1341 1342 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1343 struct fq_tin *tin, 1344 struct fq_flow *flow) 1345 { 1346 struct ieee80211_local *local; 1347 struct txq_info *txqi; 1348 struct codel_vars *cvars; 1349 struct codel_params *cparams; 1350 struct codel_stats *cstats; 1351 1352 local = container_of(fq, struct ieee80211_local, fq); 1353 txqi = container_of(tin, struct txq_info, tin); 1354 cstats = &txqi->cstats; 1355 1356 if (txqi->txq.sta) { 1357 struct sta_info *sta = container_of(txqi->txq.sta, 1358 struct sta_info, sta); 1359 cparams = &sta->cparams; 1360 } else { 1361 cparams = &local->cparams; 1362 } 1363 1364 if (flow == &txqi->def_flow) 1365 cvars = &txqi->def_cvars; 1366 else 1367 cvars = &local->cvars[flow - fq->flows]; 1368 1369 return codel_dequeue(txqi, 1370 &flow->backlog, 1371 cparams, 1372 cvars, 1373 cstats, 1374 codel_skb_len_func, 1375 codel_skb_time_func, 1376 codel_drop_func, 1377 codel_dequeue_func); 1378 } 1379 1380 static void fq_skb_free_func(struct fq *fq, 1381 struct fq_tin *tin, 1382 struct fq_flow *flow, 1383 struct sk_buff *skb) 1384 { 1385 struct ieee80211_local *local; 1386 1387 local = container_of(fq, struct ieee80211_local, fq); 1388 ieee80211_free_txskb(&local->hw, skb); 1389 } 1390 1391 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1392 struct fq_tin *tin, 1393 int idx, 1394 struct sk_buff *skb) 1395 { 1396 struct txq_info *txqi; 1397 1398 txqi = container_of(tin, struct txq_info, tin); 1399 return &txqi->def_flow; 1400 } 1401 1402 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1403 struct txq_info *txqi, 1404 struct sk_buff *skb) 1405 { 1406 struct fq *fq = &local->fq; 1407 struct fq_tin *tin = &txqi->tin; 1408 u32 flow_idx = fq_flow_idx(fq, skb); 1409 1410 ieee80211_set_skb_enqueue_time(skb); 1411 1412 spin_lock_bh(&fq->lock); 1413 fq_tin_enqueue(fq, tin, flow_idx, skb, 1414 fq_skb_free_func, 1415 fq_flow_get_default_func); 1416 spin_unlock_bh(&fq->lock); 1417 } 1418 1419 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1420 struct fq_flow *flow, struct sk_buff *skb, 1421 void *data) 1422 { 1423 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1424 1425 return info->control.vif == data; 1426 } 1427 1428 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1429 struct ieee80211_sub_if_data *sdata) 1430 { 1431 struct fq *fq = &local->fq; 1432 struct txq_info *txqi; 1433 struct fq_tin *tin; 1434 struct ieee80211_sub_if_data *ap; 1435 1436 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1437 return; 1438 1439 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1440 1441 if (!ap->vif.txq) 1442 return; 1443 1444 txqi = to_txq_info(ap->vif.txq); 1445 tin = &txqi->tin; 1446 1447 spin_lock_bh(&fq->lock); 1448 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1449 fq_skb_free_func); 1450 spin_unlock_bh(&fq->lock); 1451 } 1452 1453 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1454 struct sta_info *sta, 1455 struct txq_info *txqi, int tid) 1456 { 1457 fq_tin_init(&txqi->tin); 1458 fq_flow_init(&txqi->def_flow); 1459 codel_vars_init(&txqi->def_cvars); 1460 codel_stats_init(&txqi->cstats); 1461 __skb_queue_head_init(&txqi->frags); 1462 INIT_LIST_HEAD(&txqi->schedule_order); 1463 1464 txqi->txq.vif = &sdata->vif; 1465 1466 if (!sta) { 1467 sdata->vif.txq = &txqi->txq; 1468 txqi->txq.tid = 0; 1469 txqi->txq.ac = IEEE80211_AC_BE; 1470 1471 return; 1472 } 1473 1474 if (tid == IEEE80211_NUM_TIDS) { 1475 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1476 /* Drivers need to opt in to the management MPDU TXQ */ 1477 if (!ieee80211_hw_check(&sdata->local->hw, 1478 STA_MMPDU_TXQ)) 1479 return; 1480 } else if (!ieee80211_hw_check(&sdata->local->hw, 1481 BUFF_MMPDU_TXQ)) { 1482 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1483 return; 1484 } 1485 txqi->txq.ac = IEEE80211_AC_VO; 1486 } else { 1487 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1488 } 1489 1490 txqi->txq.sta = &sta->sta; 1491 txqi->txq.tid = tid; 1492 sta->sta.txq[tid] = &txqi->txq; 1493 } 1494 1495 void ieee80211_txq_purge(struct ieee80211_local *local, 1496 struct txq_info *txqi) 1497 { 1498 struct fq *fq = &local->fq; 1499 struct fq_tin *tin = &txqi->tin; 1500 1501 spin_lock_bh(&fq->lock); 1502 fq_tin_reset(fq, tin, fq_skb_free_func); 1503 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1504 spin_unlock_bh(&fq->lock); 1505 1506 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1507 list_del_init(&txqi->schedule_order); 1508 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1509 } 1510 1511 void ieee80211_txq_set_params(struct ieee80211_local *local) 1512 { 1513 if (local->hw.wiphy->txq_limit) 1514 local->fq.limit = local->hw.wiphy->txq_limit; 1515 else 1516 local->hw.wiphy->txq_limit = local->fq.limit; 1517 1518 if (local->hw.wiphy->txq_memory_limit) 1519 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1520 else 1521 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1522 1523 if (local->hw.wiphy->txq_quantum) 1524 local->fq.quantum = local->hw.wiphy->txq_quantum; 1525 else 1526 local->hw.wiphy->txq_quantum = local->fq.quantum; 1527 } 1528 1529 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1530 { 1531 struct fq *fq = &local->fq; 1532 int ret; 1533 int i; 1534 bool supp_vht = false; 1535 enum nl80211_band band; 1536 1537 if (!local->ops->wake_tx_queue) 1538 return 0; 1539 1540 ret = fq_init(fq, 4096); 1541 if (ret) 1542 return ret; 1543 1544 /* 1545 * If the hardware doesn't support VHT, it is safe to limit the maximum 1546 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1547 */ 1548 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1549 struct ieee80211_supported_band *sband; 1550 1551 sband = local->hw.wiphy->bands[band]; 1552 if (!sband) 1553 continue; 1554 1555 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1556 } 1557 1558 if (!supp_vht) 1559 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1560 1561 codel_params_init(&local->cparams); 1562 local->cparams.interval = MS2TIME(100); 1563 local->cparams.target = MS2TIME(20); 1564 local->cparams.ecn = true; 1565 1566 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1567 GFP_KERNEL); 1568 if (!local->cvars) { 1569 spin_lock_bh(&fq->lock); 1570 fq_reset(fq, fq_skb_free_func); 1571 spin_unlock_bh(&fq->lock); 1572 return -ENOMEM; 1573 } 1574 1575 for (i = 0; i < fq->flows_cnt; i++) 1576 codel_vars_init(&local->cvars[i]); 1577 1578 ieee80211_txq_set_params(local); 1579 1580 return 0; 1581 } 1582 1583 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1584 { 1585 struct fq *fq = &local->fq; 1586 1587 if (!local->ops->wake_tx_queue) 1588 return; 1589 1590 kfree(local->cvars); 1591 local->cvars = NULL; 1592 1593 spin_lock_bh(&fq->lock); 1594 fq_reset(fq, fq_skb_free_func); 1595 spin_unlock_bh(&fq->lock); 1596 } 1597 1598 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1599 struct ieee80211_sub_if_data *sdata, 1600 struct sta_info *sta, 1601 struct sk_buff *skb) 1602 { 1603 struct ieee80211_vif *vif; 1604 struct txq_info *txqi; 1605 1606 if (!local->ops->wake_tx_queue || 1607 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1608 return false; 1609 1610 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1611 sdata = container_of(sdata->bss, 1612 struct ieee80211_sub_if_data, u.ap); 1613 1614 vif = &sdata->vif; 1615 txqi = ieee80211_get_txq(local, vif, sta, skb); 1616 1617 if (!txqi) 1618 return false; 1619 1620 ieee80211_txq_enqueue(local, txqi, skb); 1621 1622 schedule_and_wake_txq(local, txqi); 1623 1624 return true; 1625 } 1626 1627 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1628 struct ieee80211_vif *vif, 1629 struct sta_info *sta, 1630 struct sk_buff_head *skbs, 1631 bool txpending) 1632 { 1633 struct ieee80211_tx_control control = {}; 1634 struct sk_buff *skb, *tmp; 1635 unsigned long flags; 1636 1637 skb_queue_walk_safe(skbs, skb, tmp) { 1638 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1639 int q = info->hw_queue; 1640 1641 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1642 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1643 __skb_unlink(skb, skbs); 1644 ieee80211_free_txskb(&local->hw, skb); 1645 continue; 1646 } 1647 #endif 1648 1649 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1650 if (local->queue_stop_reasons[q] || 1651 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1652 if (unlikely(info->flags & 1653 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1654 if (local->queue_stop_reasons[q] & 1655 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1656 /* 1657 * Drop off-channel frames if queues 1658 * are stopped for any reason other 1659 * than off-channel operation. Never 1660 * queue them. 1661 */ 1662 spin_unlock_irqrestore( 1663 &local->queue_stop_reason_lock, 1664 flags); 1665 ieee80211_purge_tx_queue(&local->hw, 1666 skbs); 1667 return true; 1668 } 1669 } else { 1670 1671 /* 1672 * Since queue is stopped, queue up frames for 1673 * later transmission from the tx-pending 1674 * tasklet when the queue is woken again. 1675 */ 1676 if (txpending) 1677 skb_queue_splice_init(skbs, 1678 &local->pending[q]); 1679 else 1680 skb_queue_splice_tail_init(skbs, 1681 &local->pending[q]); 1682 1683 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1684 flags); 1685 return false; 1686 } 1687 } 1688 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1689 1690 info->control.vif = vif; 1691 control.sta = sta ? &sta->sta : NULL; 1692 1693 __skb_unlink(skb, skbs); 1694 drv_tx(local, &control, skb); 1695 } 1696 1697 return true; 1698 } 1699 1700 /* 1701 * Returns false if the frame couldn't be transmitted but was queued instead. 1702 */ 1703 static bool __ieee80211_tx(struct ieee80211_local *local, 1704 struct sk_buff_head *skbs, int led_len, 1705 struct sta_info *sta, bool txpending) 1706 { 1707 struct ieee80211_tx_info *info; 1708 struct ieee80211_sub_if_data *sdata; 1709 struct ieee80211_vif *vif; 1710 struct sk_buff *skb; 1711 bool result = true; 1712 __le16 fc; 1713 1714 if (WARN_ON(skb_queue_empty(skbs))) 1715 return true; 1716 1717 skb = skb_peek(skbs); 1718 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1719 info = IEEE80211_SKB_CB(skb); 1720 sdata = vif_to_sdata(info->control.vif); 1721 if (sta && !sta->uploaded) 1722 sta = 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 fallthrough; 1745 default: 1746 vif = &sdata->vif; 1747 break; 1748 } 1749 1750 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1751 1752 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1753 1754 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1755 1756 return result; 1757 } 1758 1759 /* 1760 * Invoke TX handlers, return 0 on success and non-zero if the 1761 * frame was dropped or queued. 1762 * 1763 * The handlers are split into an early and late part. The latter is everything 1764 * that can be sensitive to reordering, and will be deferred to after packets 1765 * are dequeued from the intermediate queues (when they are enabled). 1766 */ 1767 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1768 { 1769 ieee80211_tx_result res = TX_DROP; 1770 1771 #define CALL_TXH(txh) \ 1772 do { \ 1773 res = txh(tx); \ 1774 if (res != TX_CONTINUE) \ 1775 goto txh_done; \ 1776 } while (0) 1777 1778 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1779 CALL_TXH(ieee80211_tx_h_check_assoc); 1780 CALL_TXH(ieee80211_tx_h_ps_buf); 1781 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1782 CALL_TXH(ieee80211_tx_h_select_key); 1783 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1784 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1785 1786 txh_done: 1787 if (unlikely(res == TX_DROP)) { 1788 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1789 if (tx->skb) 1790 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1791 else 1792 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1793 return -1; 1794 } else if (unlikely(res == TX_QUEUED)) { 1795 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1796 return -1; 1797 } 1798 1799 return 0; 1800 } 1801 1802 /* 1803 * Late handlers can be called while the sta lock is held. Handlers that can 1804 * cause packets to be generated will cause deadlock! 1805 */ 1806 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1807 { 1808 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1809 ieee80211_tx_result res = TX_CONTINUE; 1810 1811 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1812 __skb_queue_tail(&tx->skbs, tx->skb); 1813 tx->skb = NULL; 1814 goto txh_done; 1815 } 1816 1817 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1818 CALL_TXH(ieee80211_tx_h_sequence); 1819 CALL_TXH(ieee80211_tx_h_fragment); 1820 /* handlers after fragment must be aware of tx info fragmentation! */ 1821 CALL_TXH(ieee80211_tx_h_stats); 1822 CALL_TXH(ieee80211_tx_h_encrypt); 1823 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1824 CALL_TXH(ieee80211_tx_h_calculate_duration); 1825 #undef CALL_TXH 1826 1827 txh_done: 1828 if (unlikely(res == TX_DROP)) { 1829 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1830 if (tx->skb) 1831 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1832 else 1833 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1834 return -1; 1835 } else if (unlikely(res == TX_QUEUED)) { 1836 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1837 return -1; 1838 } 1839 1840 return 0; 1841 } 1842 1843 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1844 { 1845 int r = invoke_tx_handlers_early(tx); 1846 1847 if (r) 1848 return r; 1849 return invoke_tx_handlers_late(tx); 1850 } 1851 1852 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1853 struct ieee80211_vif *vif, struct sk_buff *skb, 1854 int band, struct ieee80211_sta **sta) 1855 { 1856 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1857 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1858 struct ieee80211_tx_data tx; 1859 struct sk_buff *skb2; 1860 1861 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1862 return false; 1863 1864 info->band = band; 1865 info->control.vif = vif; 1866 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1867 1868 if (invoke_tx_handlers(&tx)) 1869 return false; 1870 1871 if (sta) { 1872 if (tx.sta) 1873 *sta = &tx.sta->sta; 1874 else 1875 *sta = NULL; 1876 } 1877 1878 /* this function isn't suitable for fragmented data frames */ 1879 skb2 = __skb_dequeue(&tx.skbs); 1880 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1881 ieee80211_free_txskb(hw, skb2); 1882 ieee80211_purge_tx_queue(hw, &tx.skbs); 1883 return false; 1884 } 1885 1886 return true; 1887 } 1888 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1889 1890 /* 1891 * Returns false if the frame couldn't be transmitted but was queued instead. 1892 */ 1893 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1894 struct sta_info *sta, struct sk_buff *skb, 1895 bool txpending) 1896 { 1897 struct ieee80211_local *local = sdata->local; 1898 struct ieee80211_tx_data tx; 1899 ieee80211_tx_result res_prepare; 1900 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1901 bool result = true; 1902 int led_len; 1903 1904 if (unlikely(skb->len < 10)) { 1905 dev_kfree_skb(skb); 1906 return true; 1907 } 1908 1909 /* initialises tx */ 1910 led_len = skb->len; 1911 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1912 1913 if (unlikely(res_prepare == TX_DROP)) { 1914 ieee80211_free_txskb(&local->hw, skb); 1915 return true; 1916 } else if (unlikely(res_prepare == TX_QUEUED)) { 1917 return true; 1918 } 1919 1920 /* set up hw_queue value early */ 1921 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1922 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1923 info->hw_queue = 1924 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1925 1926 if (invoke_tx_handlers_early(&tx)) 1927 return true; 1928 1929 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1930 return true; 1931 1932 if (!invoke_tx_handlers_late(&tx)) 1933 result = __ieee80211_tx(local, &tx.skbs, led_len, 1934 tx.sta, txpending); 1935 1936 return result; 1937 } 1938 1939 /* device xmit handlers */ 1940 1941 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1942 struct sk_buff *skb, 1943 int head_need, bool may_encrypt) 1944 { 1945 struct ieee80211_local *local = sdata->local; 1946 struct ieee80211_hdr *hdr; 1947 bool enc_tailroom; 1948 int tail_need = 0; 1949 1950 hdr = (struct ieee80211_hdr *) skb->data; 1951 enc_tailroom = may_encrypt && 1952 (sdata->crypto_tx_tailroom_needed_cnt || 1953 ieee80211_is_mgmt(hdr->frame_control)); 1954 1955 if (enc_tailroom) { 1956 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1957 tail_need -= skb_tailroom(skb); 1958 tail_need = max_t(int, tail_need, 0); 1959 } 1960 1961 if (skb_cloned(skb) && 1962 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1963 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1964 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1965 else if (head_need || tail_need) 1966 I802_DEBUG_INC(local->tx_expand_skb_head); 1967 else 1968 return 0; 1969 1970 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1971 wiphy_debug(local->hw.wiphy, 1972 "failed to reallocate TX buffer\n"); 1973 return -ENOMEM; 1974 } 1975 1976 return 0; 1977 } 1978 1979 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1980 struct sta_info *sta, struct sk_buff *skb) 1981 { 1982 struct ieee80211_local *local = sdata->local; 1983 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1984 struct ieee80211_hdr *hdr; 1985 int headroom; 1986 bool may_encrypt; 1987 1988 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1989 1990 headroom = local->tx_headroom; 1991 if (may_encrypt) 1992 headroom += sdata->encrypt_headroom; 1993 headroom -= skb_headroom(skb); 1994 headroom = max_t(int, 0, headroom); 1995 1996 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1997 ieee80211_free_txskb(&local->hw, skb); 1998 return; 1999 } 2000 2001 hdr = (struct ieee80211_hdr *) skb->data; 2002 info->control.vif = &sdata->vif; 2003 2004 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2005 if (ieee80211_is_data(hdr->frame_control) && 2006 is_unicast_ether_addr(hdr->addr1)) { 2007 if (mesh_nexthop_resolve(sdata, skb)) 2008 return; /* skb queued: don't free */ 2009 } else { 2010 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2011 } 2012 } 2013 2014 ieee80211_set_qos_hdr(sdata, skb); 2015 ieee80211_tx(sdata, sta, skb, false); 2016 } 2017 2018 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2019 struct net_device *dev) 2020 { 2021 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2022 struct ieee80211_radiotap_iterator iterator; 2023 struct ieee80211_radiotap_header *rthdr = 2024 (struct ieee80211_radiotap_header *) skb->data; 2025 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2026 struct ieee80211_supported_band *sband = 2027 local->hw.wiphy->bands[info->band]; 2028 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2029 NULL); 2030 u16 txflags; 2031 u16 rate = 0; 2032 bool rate_found = false; 2033 u8 rate_retries = 0; 2034 u16 rate_flags = 0; 2035 u8 mcs_known, mcs_flags, mcs_bw; 2036 u16 vht_known; 2037 u8 vht_mcs = 0, vht_nss = 0; 2038 int i; 2039 2040 /* check for not even having the fixed radiotap header part */ 2041 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2042 return false; /* too short to be possibly valid */ 2043 2044 /* is it a header version we can trust to find length from? */ 2045 if (unlikely(rthdr->it_version)) 2046 return false; /* only version 0 is supported */ 2047 2048 /* does the skb contain enough to deliver on the alleged length? */ 2049 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2050 return false; /* skb too short for claimed rt header extent */ 2051 2052 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2053 IEEE80211_TX_CTL_DONTFRAG; 2054 2055 /* 2056 * for every radiotap entry that is present 2057 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2058 * entries present, or -EINVAL on error) 2059 */ 2060 2061 while (!ret) { 2062 ret = ieee80211_radiotap_iterator_next(&iterator); 2063 2064 if (ret) 2065 continue; 2066 2067 /* see if this argument is something we can use */ 2068 switch (iterator.this_arg_index) { 2069 /* 2070 * You must take care when dereferencing iterator.this_arg 2071 * for multibyte types... the pointer is not aligned. Use 2072 * get_unaligned((type *)iterator.this_arg) to dereference 2073 * iterator.this_arg for type "type" safely on all arches. 2074 */ 2075 case IEEE80211_RADIOTAP_FLAGS: 2076 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2077 /* 2078 * this indicates that the skb we have been 2079 * handed has the 32-bit FCS CRC at the end... 2080 * we should react to that by snipping it off 2081 * because it will be recomputed and added 2082 * on transmission 2083 */ 2084 if (skb->len < (iterator._max_length + FCS_LEN)) 2085 return false; 2086 2087 skb_trim(skb, skb->len - FCS_LEN); 2088 } 2089 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2090 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2091 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2092 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2093 break; 2094 2095 case IEEE80211_RADIOTAP_TX_FLAGS: 2096 txflags = get_unaligned_le16(iterator.this_arg); 2097 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2098 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2099 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2100 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2101 break; 2102 2103 case IEEE80211_RADIOTAP_RATE: 2104 rate = *iterator.this_arg; 2105 rate_flags = 0; 2106 rate_found = true; 2107 break; 2108 2109 case IEEE80211_RADIOTAP_DATA_RETRIES: 2110 rate_retries = *iterator.this_arg; 2111 break; 2112 2113 case IEEE80211_RADIOTAP_MCS: 2114 mcs_known = iterator.this_arg[0]; 2115 mcs_flags = iterator.this_arg[1]; 2116 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2117 break; 2118 2119 rate_found = true; 2120 rate = iterator.this_arg[2]; 2121 rate_flags = IEEE80211_TX_RC_MCS; 2122 2123 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2124 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2125 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2126 2127 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2128 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2129 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2130 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2131 break; 2132 2133 case IEEE80211_RADIOTAP_VHT: 2134 vht_known = get_unaligned_le16(iterator.this_arg); 2135 rate_found = true; 2136 2137 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2138 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2139 (iterator.this_arg[2] & 2140 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2141 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2142 if (vht_known & 2143 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2144 if (iterator.this_arg[3] == 1) 2145 rate_flags |= 2146 IEEE80211_TX_RC_40_MHZ_WIDTH; 2147 else if (iterator.this_arg[3] == 4) 2148 rate_flags |= 2149 IEEE80211_TX_RC_80_MHZ_WIDTH; 2150 else if (iterator.this_arg[3] == 11) 2151 rate_flags |= 2152 IEEE80211_TX_RC_160_MHZ_WIDTH; 2153 } 2154 2155 vht_mcs = iterator.this_arg[4] >> 4; 2156 vht_nss = iterator.this_arg[4] & 0xF; 2157 break; 2158 2159 /* 2160 * Please update the file 2161 * Documentation/networking/mac80211-injection.rst 2162 * when parsing new fields here. 2163 */ 2164 2165 default: 2166 break; 2167 } 2168 } 2169 2170 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2171 return false; 2172 2173 if (rate_found) { 2174 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2175 2176 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2177 info->control.rates[i].idx = -1; 2178 info->control.rates[i].flags = 0; 2179 info->control.rates[i].count = 0; 2180 } 2181 2182 if (rate_flags & IEEE80211_TX_RC_MCS) { 2183 info->control.rates[0].idx = rate; 2184 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2185 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2186 vht_nss); 2187 } else { 2188 for (i = 0; i < sband->n_bitrates; i++) { 2189 if (rate * 5 != sband->bitrates[i].bitrate) 2190 continue; 2191 2192 info->control.rates[0].idx = i; 2193 break; 2194 } 2195 } 2196 2197 if (info->control.rates[0].idx < 0) 2198 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2199 2200 info->control.rates[0].flags = rate_flags; 2201 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2202 local->hw.max_rate_tries); 2203 } 2204 2205 return true; 2206 } 2207 2208 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2209 struct net_device *dev) 2210 { 2211 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2212 struct ieee80211_chanctx_conf *chanctx_conf; 2213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2214 struct ieee80211_hdr *hdr; 2215 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2216 struct cfg80211_chan_def *chandef; 2217 u16 len_rthdr; 2218 int hdrlen; 2219 2220 memset(info, 0, sizeof(*info)); 2221 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2222 IEEE80211_TX_CTL_INJECTED; 2223 2224 /* Sanity-check and process the injection radiotap header */ 2225 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2226 goto fail; 2227 2228 /* we now know there is a radiotap header with a length we can use */ 2229 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2230 2231 /* 2232 * fix up the pointers accounting for the radiotap 2233 * header still being in there. We are being given 2234 * a precooked IEEE80211 header so no need for 2235 * normal processing 2236 */ 2237 skb_set_mac_header(skb, len_rthdr); 2238 /* 2239 * these are just fixed to the end of the rt area since we 2240 * don't have any better information and at this point, nobody cares 2241 */ 2242 skb_set_network_header(skb, len_rthdr); 2243 skb_set_transport_header(skb, len_rthdr); 2244 2245 if (skb->len < len_rthdr + 2) 2246 goto fail; 2247 2248 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2249 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2250 2251 if (skb->len < len_rthdr + hdrlen) 2252 goto fail; 2253 2254 /* 2255 * Initialize skb->protocol if the injected frame is a data frame 2256 * carrying a rfc1042 header 2257 */ 2258 if (ieee80211_is_data(hdr->frame_control) && 2259 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2260 u8 *payload = (u8 *)hdr + hdrlen; 2261 2262 if (ether_addr_equal(payload, rfc1042_header)) 2263 skb->protocol = cpu_to_be16((payload[6] << 8) | 2264 payload[7]); 2265 } 2266 2267 /* 2268 * Initialize skb->priority for QoS frames. This is put in the TID field 2269 * of the frame before passing it to the driver. 2270 */ 2271 if (ieee80211_is_data_qos(hdr->frame_control)) { 2272 u8 *p = ieee80211_get_qos_ctl(hdr); 2273 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 2274 } 2275 2276 rcu_read_lock(); 2277 2278 /* 2279 * We process outgoing injected frames that have a local address 2280 * we handle as though they are non-injected frames. 2281 * This code here isn't entirely correct, the local MAC address 2282 * isn't always enough to find the interface to use; for proper 2283 * VLAN/WDS support we will need a different mechanism (which 2284 * likely isn't going to be monitor interfaces). 2285 * 2286 * This is necessary, for example, for old hostapd versions that 2287 * don't use nl80211-based management TX/RX. 2288 */ 2289 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2290 2291 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2292 if (!ieee80211_sdata_running(tmp_sdata)) 2293 continue; 2294 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2295 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2296 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2297 continue; 2298 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2299 sdata = tmp_sdata; 2300 break; 2301 } 2302 } 2303 2304 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2305 if (!chanctx_conf) { 2306 tmp_sdata = rcu_dereference(local->monitor_sdata); 2307 if (tmp_sdata) 2308 chanctx_conf = 2309 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2310 } 2311 2312 if (chanctx_conf) 2313 chandef = &chanctx_conf->def; 2314 else if (!local->use_chanctx) 2315 chandef = &local->_oper_chandef; 2316 else 2317 goto fail_rcu; 2318 2319 /* 2320 * Frame injection is not allowed if beaconing is not allowed 2321 * or if we need radar detection. Beaconing is usually not allowed when 2322 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2323 * Passive scan is also used in world regulatory domains where 2324 * your country is not known and as such it should be treated as 2325 * NO TX unless the channel is explicitly allowed in which case 2326 * your current regulatory domain would not have the passive scan 2327 * flag. 2328 * 2329 * Since AP mode uses monitor interfaces to inject/TX management 2330 * frames we can make AP mode the exception to this rule once it 2331 * supports radar detection as its implementation can deal with 2332 * radar detection by itself. We can do that later by adding a 2333 * monitor flag interfaces used for AP support. 2334 */ 2335 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2336 sdata->vif.type)) 2337 goto fail_rcu; 2338 2339 info->band = chandef->chan->band; 2340 2341 /* remove the injection radiotap header */ 2342 skb_pull(skb, len_rthdr); 2343 2344 ieee80211_xmit(sdata, NULL, skb); 2345 rcu_read_unlock(); 2346 2347 return NETDEV_TX_OK; 2348 2349 fail_rcu: 2350 rcu_read_unlock(); 2351 fail: 2352 dev_kfree_skb(skb); 2353 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2354 } 2355 2356 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2357 { 2358 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2359 2360 return ethertype == ETH_P_TDLS && 2361 skb->len > 14 && 2362 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2363 } 2364 2365 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2366 struct sk_buff *skb, 2367 struct sta_info **sta_out) 2368 { 2369 struct sta_info *sta; 2370 2371 switch (sdata->vif.type) { 2372 case NL80211_IFTYPE_AP_VLAN: 2373 sta = rcu_dereference(sdata->u.vlan.sta); 2374 if (sta) { 2375 *sta_out = sta; 2376 return 0; 2377 } else if (sdata->wdev.use_4addr) { 2378 return -ENOLINK; 2379 } 2380 fallthrough; 2381 case NL80211_IFTYPE_AP: 2382 case NL80211_IFTYPE_OCB: 2383 case NL80211_IFTYPE_ADHOC: 2384 if (is_multicast_ether_addr(skb->data)) { 2385 *sta_out = ERR_PTR(-ENOENT); 2386 return 0; 2387 } 2388 sta = sta_info_get_bss(sdata, skb->data); 2389 break; 2390 case NL80211_IFTYPE_WDS: 2391 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2392 break; 2393 #ifdef CONFIG_MAC80211_MESH 2394 case NL80211_IFTYPE_MESH_POINT: 2395 /* determined much later */ 2396 *sta_out = NULL; 2397 return 0; 2398 #endif 2399 case NL80211_IFTYPE_STATION: 2400 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2401 sta = sta_info_get(sdata, skb->data); 2402 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2403 if (test_sta_flag(sta, 2404 WLAN_STA_TDLS_PEER_AUTH)) { 2405 *sta_out = sta; 2406 return 0; 2407 } 2408 2409 /* 2410 * TDLS link during setup - throw out frames to 2411 * peer. Allow TDLS-setup frames to unauthorized 2412 * peers for the special case of a link teardown 2413 * after a TDLS sta is removed due to being 2414 * unreachable. 2415 */ 2416 if (!ieee80211_is_tdls_setup(skb)) 2417 return -EINVAL; 2418 } 2419 2420 } 2421 2422 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2423 if (!sta) 2424 return -ENOLINK; 2425 break; 2426 default: 2427 return -EINVAL; 2428 } 2429 2430 *sta_out = sta ?: ERR_PTR(-ENOENT); 2431 return 0; 2432 } 2433 2434 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2435 struct sk_buff *skb, 2436 u32 *info_flags, 2437 u64 *cookie) 2438 { 2439 struct sk_buff *ack_skb; 2440 u16 info_id = 0; 2441 2442 if (skb->sk) 2443 ack_skb = skb_clone_sk(skb); 2444 else 2445 ack_skb = skb_clone(skb, GFP_ATOMIC); 2446 2447 if (ack_skb) { 2448 unsigned long flags; 2449 int id; 2450 2451 spin_lock_irqsave(&local->ack_status_lock, flags); 2452 id = idr_alloc(&local->ack_status_frames, ack_skb, 2453 1, 0x2000, GFP_ATOMIC); 2454 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2455 2456 if (id >= 0) { 2457 info_id = id; 2458 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2459 if (cookie) { 2460 *cookie = ieee80211_mgmt_tx_cookie(local); 2461 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2462 } 2463 } else { 2464 kfree_skb(ack_skb); 2465 } 2466 } 2467 2468 return info_id; 2469 } 2470 2471 /** 2472 * ieee80211_build_hdr - build 802.11 header in the given frame 2473 * @sdata: virtual interface to build the header for 2474 * @skb: the skb to build the header in 2475 * @info_flags: skb flags to set 2476 * @ctrl_flags: info control flags to set 2477 * 2478 * This function takes the skb with 802.3 header and reformats the header to 2479 * the appropriate IEEE 802.11 header based on which interface the packet is 2480 * being transmitted on. 2481 * 2482 * Note that this function also takes care of the TX status request and 2483 * potential unsharing of the SKB - this needs to be interleaved with the 2484 * header building. 2485 * 2486 * The function requires the read-side RCU lock held 2487 * 2488 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2489 */ 2490 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2491 struct sk_buff *skb, u32 info_flags, 2492 struct sta_info *sta, u32 ctrl_flags, 2493 u64 *cookie) 2494 { 2495 struct ieee80211_local *local = sdata->local; 2496 struct ieee80211_tx_info *info; 2497 int head_need; 2498 u16 ethertype, hdrlen, meshhdrlen = 0; 2499 __le16 fc; 2500 struct ieee80211_hdr hdr; 2501 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2502 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2503 const u8 *encaps_data; 2504 int encaps_len, skip_header_bytes; 2505 bool wme_sta = false, authorized = false; 2506 bool tdls_peer; 2507 bool multicast; 2508 u16 info_id = 0; 2509 struct ieee80211_chanctx_conf *chanctx_conf; 2510 struct ieee80211_sub_if_data *ap_sdata; 2511 enum nl80211_band band; 2512 int ret; 2513 2514 if (IS_ERR(sta)) 2515 sta = NULL; 2516 2517 #ifdef CONFIG_MAC80211_DEBUGFS 2518 if (local->force_tx_status) 2519 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2520 #endif 2521 2522 /* convert Ethernet header to proper 802.11 header (based on 2523 * operation mode) */ 2524 ethertype = (skb->data[12] << 8) | skb->data[13]; 2525 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2526 2527 switch (sdata->vif.type) { 2528 case NL80211_IFTYPE_AP_VLAN: 2529 if (sdata->wdev.use_4addr) { 2530 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2531 /* RA TA DA SA */ 2532 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2533 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2534 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2535 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2536 hdrlen = 30; 2537 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2538 wme_sta = sta->sta.wme; 2539 } 2540 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2541 u.ap); 2542 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2543 if (!chanctx_conf) { 2544 ret = -ENOTCONN; 2545 goto free; 2546 } 2547 band = chanctx_conf->def.chan->band; 2548 if (sdata->wdev.use_4addr) 2549 break; 2550 fallthrough; 2551 case NL80211_IFTYPE_AP: 2552 if (sdata->vif.type == NL80211_IFTYPE_AP) 2553 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2554 if (!chanctx_conf) { 2555 ret = -ENOTCONN; 2556 goto free; 2557 } 2558 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2559 /* DA BSSID SA */ 2560 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2561 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2562 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2563 hdrlen = 24; 2564 band = chanctx_conf->def.chan->band; 2565 break; 2566 case NL80211_IFTYPE_WDS: 2567 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2568 /* RA TA DA SA */ 2569 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2570 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2571 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2572 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2573 hdrlen = 30; 2574 /* 2575 * This is the exception! WDS style interfaces are prohibited 2576 * when channel contexts are in used so this must be valid 2577 */ 2578 band = local->hw.conf.chandef.chan->band; 2579 break; 2580 #ifdef CONFIG_MAC80211_MESH 2581 case NL80211_IFTYPE_MESH_POINT: 2582 if (!is_multicast_ether_addr(skb->data)) { 2583 struct sta_info *next_hop; 2584 bool mpp_lookup = true; 2585 2586 mpath = mesh_path_lookup(sdata, skb->data); 2587 if (mpath) { 2588 mpp_lookup = false; 2589 next_hop = rcu_dereference(mpath->next_hop); 2590 if (!next_hop || 2591 !(mpath->flags & (MESH_PATH_ACTIVE | 2592 MESH_PATH_RESOLVING))) 2593 mpp_lookup = true; 2594 } 2595 2596 if (mpp_lookup) { 2597 mppath = mpp_path_lookup(sdata, skb->data); 2598 if (mppath) 2599 mppath->exp_time = jiffies; 2600 } 2601 2602 if (mppath && mpath) 2603 mesh_path_del(sdata, mpath->dst); 2604 } 2605 2606 /* 2607 * Use address extension if it is a packet from 2608 * another interface or if we know the destination 2609 * is being proxied by a portal (i.e. portal address 2610 * differs from proxied address) 2611 */ 2612 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2613 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2614 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2615 skb->data, skb->data + ETH_ALEN); 2616 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2617 NULL, NULL); 2618 } else { 2619 /* DS -> MBSS (802.11-2012 13.11.3.3). 2620 * For unicast with unknown forwarding information, 2621 * destination might be in the MBSS or if that fails 2622 * forwarded to another mesh gate. In either case 2623 * resolution will be handled in ieee80211_xmit(), so 2624 * leave the original DA. This also works for mcast */ 2625 const u8 *mesh_da = skb->data; 2626 2627 if (mppath) 2628 mesh_da = mppath->mpp; 2629 else if (mpath) 2630 mesh_da = mpath->dst; 2631 2632 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2633 mesh_da, sdata->vif.addr); 2634 if (is_multicast_ether_addr(mesh_da)) 2635 /* DA TA mSA AE:SA */ 2636 meshhdrlen = ieee80211_new_mesh_header( 2637 sdata, &mesh_hdr, 2638 skb->data + ETH_ALEN, NULL); 2639 else 2640 /* RA TA mDA mSA AE:DA SA */ 2641 meshhdrlen = ieee80211_new_mesh_header( 2642 sdata, &mesh_hdr, skb->data, 2643 skb->data + ETH_ALEN); 2644 2645 } 2646 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2647 if (!chanctx_conf) { 2648 ret = -ENOTCONN; 2649 goto free; 2650 } 2651 band = chanctx_conf->def.chan->band; 2652 2653 /* For injected frames, fill RA right away as nexthop lookup 2654 * will be skipped. 2655 */ 2656 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2657 is_zero_ether_addr(hdr.addr1)) 2658 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2659 break; 2660 #endif 2661 case NL80211_IFTYPE_STATION: 2662 /* we already did checks when looking up the RA STA */ 2663 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2664 2665 if (tdls_peer) { 2666 /* DA SA BSSID */ 2667 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2668 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2669 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2670 hdrlen = 24; 2671 } else if (sdata->u.mgd.use_4addr && 2672 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2673 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2674 IEEE80211_FCTL_TODS); 2675 /* RA TA DA SA */ 2676 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2677 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2678 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2679 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2680 hdrlen = 30; 2681 } else { 2682 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2683 /* BSSID SA DA */ 2684 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2685 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2686 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2687 hdrlen = 24; 2688 } 2689 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2690 if (!chanctx_conf) { 2691 ret = -ENOTCONN; 2692 goto free; 2693 } 2694 band = chanctx_conf->def.chan->band; 2695 break; 2696 case NL80211_IFTYPE_OCB: 2697 /* DA SA BSSID */ 2698 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2699 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2700 eth_broadcast_addr(hdr.addr3); 2701 hdrlen = 24; 2702 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2703 if (!chanctx_conf) { 2704 ret = -ENOTCONN; 2705 goto free; 2706 } 2707 band = chanctx_conf->def.chan->band; 2708 break; 2709 case NL80211_IFTYPE_ADHOC: 2710 /* DA SA BSSID */ 2711 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2712 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2713 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2714 hdrlen = 24; 2715 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2716 if (!chanctx_conf) { 2717 ret = -ENOTCONN; 2718 goto free; 2719 } 2720 band = chanctx_conf->def.chan->band; 2721 break; 2722 default: 2723 ret = -EINVAL; 2724 goto free; 2725 } 2726 2727 multicast = is_multicast_ether_addr(hdr.addr1); 2728 2729 /* sta is always NULL for mesh */ 2730 if (sta) { 2731 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2732 wme_sta = sta->sta.wme; 2733 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2734 /* For mesh, the use of the QoS header is mandatory */ 2735 wme_sta = true; 2736 } 2737 2738 /* receiver does QoS (which also means we do) use it */ 2739 if (wme_sta) { 2740 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2741 hdrlen += 2; 2742 } 2743 2744 /* 2745 * Drop unicast frames to unauthorised stations unless they are 2746 * EAPOL frames from the local station. 2747 */ 2748 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2749 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2750 !multicast && !authorized && 2751 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2752 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2753 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2754 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2755 sdata->name, hdr.addr1); 2756 #endif 2757 2758 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2759 2760 ret = -EPERM; 2761 goto free; 2762 } 2763 2764 if (unlikely(!multicast && ((skb->sk && 2765 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2766 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2767 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2768 cookie); 2769 2770 /* 2771 * If the skb is shared we need to obtain our own copy. 2772 */ 2773 if (skb_shared(skb)) { 2774 struct sk_buff *tmp_skb = skb; 2775 2776 /* can't happen -- skb is a clone if info_id != 0 */ 2777 WARN_ON(info_id); 2778 2779 skb = skb_clone(skb, GFP_ATOMIC); 2780 kfree_skb(tmp_skb); 2781 2782 if (!skb) { 2783 ret = -ENOMEM; 2784 goto free; 2785 } 2786 } 2787 2788 hdr.frame_control = fc; 2789 hdr.duration_id = 0; 2790 hdr.seq_ctrl = 0; 2791 2792 skip_header_bytes = ETH_HLEN; 2793 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2794 encaps_data = bridge_tunnel_header; 2795 encaps_len = sizeof(bridge_tunnel_header); 2796 skip_header_bytes -= 2; 2797 } else if (ethertype >= ETH_P_802_3_MIN) { 2798 encaps_data = rfc1042_header; 2799 encaps_len = sizeof(rfc1042_header); 2800 skip_header_bytes -= 2; 2801 } else { 2802 encaps_data = NULL; 2803 encaps_len = 0; 2804 } 2805 2806 skb_pull(skb, skip_header_bytes); 2807 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2808 2809 /* 2810 * So we need to modify the skb header and hence need a copy of 2811 * that. The head_need variable above doesn't, so far, include 2812 * the needed header space that we don't need right away. If we 2813 * can, then we don't reallocate right now but only after the 2814 * frame arrives at the master device (if it does...) 2815 * 2816 * If we cannot, however, then we will reallocate to include all 2817 * the ever needed space. Also, if we need to reallocate it anyway, 2818 * make it big enough for everything we may ever need. 2819 */ 2820 2821 if (head_need > 0 || skb_cloned(skb)) { 2822 head_need += sdata->encrypt_headroom; 2823 head_need += local->tx_headroom; 2824 head_need = max_t(int, 0, head_need); 2825 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2826 ieee80211_free_txskb(&local->hw, skb); 2827 skb = NULL; 2828 return ERR_PTR(-ENOMEM); 2829 } 2830 } 2831 2832 if (encaps_data) 2833 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2834 2835 #ifdef CONFIG_MAC80211_MESH 2836 if (meshhdrlen > 0) 2837 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2838 #endif 2839 2840 if (ieee80211_is_data_qos(fc)) { 2841 __le16 *qos_control; 2842 2843 qos_control = skb_push(skb, 2); 2844 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2845 /* 2846 * Maybe we could actually set some fields here, for now just 2847 * initialise to zero to indicate no special operation. 2848 */ 2849 *qos_control = 0; 2850 } else 2851 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2852 2853 skb_reset_mac_header(skb); 2854 2855 info = IEEE80211_SKB_CB(skb); 2856 memset(info, 0, sizeof(*info)); 2857 2858 info->flags = info_flags; 2859 info->ack_frame_id = info_id; 2860 info->band = band; 2861 info->control.flags = ctrl_flags; 2862 2863 return skb; 2864 free: 2865 kfree_skb(skb); 2866 return ERR_PTR(ret); 2867 } 2868 2869 /* 2870 * fast-xmit overview 2871 * 2872 * The core idea of this fast-xmit is to remove per-packet checks by checking 2873 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2874 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2875 * much less work can be done per packet. For example, fragmentation must be 2876 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2877 * in the code here. 2878 * 2879 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2880 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2881 * 2882 * The most difficult part of this is that when any of these assumptions 2883 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2884 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2885 * since the per-packet code no longer checks the conditions. This is reflected 2886 * by the calls to these functions throughout the rest of the code, and must be 2887 * maintained if any of the TX path checks change. 2888 */ 2889 2890 void ieee80211_check_fast_xmit(struct sta_info *sta) 2891 { 2892 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2893 struct ieee80211_local *local = sta->local; 2894 struct ieee80211_sub_if_data *sdata = sta->sdata; 2895 struct ieee80211_hdr *hdr = (void *)build.hdr; 2896 struct ieee80211_chanctx_conf *chanctx_conf; 2897 __le16 fc; 2898 2899 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2900 return; 2901 2902 /* Locking here protects both the pointer itself, and against concurrent 2903 * invocations winning data access races to, e.g., the key pointer that 2904 * is used. 2905 * Without it, the invocation of this function right after the key 2906 * pointer changes wouldn't be sufficient, as another CPU could access 2907 * the pointer, then stall, and then do the cache update after the CPU 2908 * that invalidated the key. 2909 * With the locking, such scenarios cannot happen as the check for the 2910 * key and the fast-tx assignment are done atomically, so the CPU that 2911 * modifies the key will either wait or other one will see the key 2912 * cleared/changed already. 2913 */ 2914 spin_lock_bh(&sta->lock); 2915 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2916 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2917 sdata->vif.type == NL80211_IFTYPE_STATION) 2918 goto out; 2919 2920 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2921 goto out; 2922 2923 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2924 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2925 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2926 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2927 goto out; 2928 2929 if (sdata->noack_map) 2930 goto out; 2931 2932 /* fast-xmit doesn't handle fragmentation at all */ 2933 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2934 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2935 goto out; 2936 2937 rcu_read_lock(); 2938 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2939 if (!chanctx_conf) { 2940 rcu_read_unlock(); 2941 goto out; 2942 } 2943 build.band = chanctx_conf->def.chan->band; 2944 rcu_read_unlock(); 2945 2946 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2947 2948 switch (sdata->vif.type) { 2949 case NL80211_IFTYPE_ADHOC: 2950 /* DA SA BSSID */ 2951 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2952 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2953 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2954 build.hdr_len = 24; 2955 break; 2956 case NL80211_IFTYPE_STATION: 2957 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2958 /* DA SA BSSID */ 2959 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2960 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2961 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2962 build.hdr_len = 24; 2963 break; 2964 } 2965 2966 if (sdata->u.mgd.use_4addr) { 2967 /* non-regular ethertype cannot use the fastpath */ 2968 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2969 IEEE80211_FCTL_TODS); 2970 /* RA TA DA SA */ 2971 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2972 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2973 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2974 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2975 build.hdr_len = 30; 2976 break; 2977 } 2978 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2979 /* BSSID SA DA */ 2980 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2981 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2982 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2983 build.hdr_len = 24; 2984 break; 2985 case NL80211_IFTYPE_AP_VLAN: 2986 if (sdata->wdev.use_4addr) { 2987 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2988 IEEE80211_FCTL_TODS); 2989 /* RA TA DA SA */ 2990 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2991 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2992 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2993 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2994 build.hdr_len = 30; 2995 break; 2996 } 2997 fallthrough; 2998 case NL80211_IFTYPE_AP: 2999 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3000 /* DA BSSID SA */ 3001 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3002 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3003 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3004 build.hdr_len = 24; 3005 break; 3006 default: 3007 /* not handled on fast-xmit */ 3008 goto out; 3009 } 3010 3011 if (sta->sta.wme) { 3012 build.hdr_len += 2; 3013 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3014 } 3015 3016 /* We store the key here so there's no point in using rcu_dereference() 3017 * but that's fine because the code that changes the pointers will call 3018 * this function after doing so. For a single CPU that would be enough, 3019 * for multiple see the comment above. 3020 */ 3021 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3022 if (!build.key) 3023 build.key = rcu_access_pointer(sdata->default_unicast_key); 3024 if (build.key) { 3025 bool gen_iv, iv_spc, mmic; 3026 3027 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3028 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3029 mmic = build.key->conf.flags & 3030 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3031 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3032 3033 /* don't handle software crypto */ 3034 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3035 goto out; 3036 3037 /* Key is being removed */ 3038 if (build.key->flags & KEY_FLAG_TAINTED) 3039 goto out; 3040 3041 switch (build.key->conf.cipher) { 3042 case WLAN_CIPHER_SUITE_CCMP: 3043 case WLAN_CIPHER_SUITE_CCMP_256: 3044 if (gen_iv) 3045 build.pn_offs = build.hdr_len; 3046 if (gen_iv || iv_spc) 3047 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3048 break; 3049 case WLAN_CIPHER_SUITE_GCMP: 3050 case WLAN_CIPHER_SUITE_GCMP_256: 3051 if (gen_iv) 3052 build.pn_offs = build.hdr_len; 3053 if (gen_iv || iv_spc) 3054 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3055 break; 3056 case WLAN_CIPHER_SUITE_TKIP: 3057 /* cannot handle MMIC or IV generation in xmit-fast */ 3058 if (mmic || gen_iv) 3059 goto out; 3060 if (iv_spc) 3061 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3062 break; 3063 case WLAN_CIPHER_SUITE_WEP40: 3064 case WLAN_CIPHER_SUITE_WEP104: 3065 /* cannot handle IV generation in fast-xmit */ 3066 if (gen_iv) 3067 goto out; 3068 if (iv_spc) 3069 build.hdr_len += IEEE80211_WEP_IV_LEN; 3070 break; 3071 case WLAN_CIPHER_SUITE_AES_CMAC: 3072 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3073 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3074 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3075 WARN(1, 3076 "management cipher suite 0x%x enabled for data\n", 3077 build.key->conf.cipher); 3078 goto out; 3079 default: 3080 /* we don't know how to generate IVs for this at all */ 3081 if (WARN_ON(gen_iv)) 3082 goto out; 3083 /* pure hardware keys are OK, of course */ 3084 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3085 break; 3086 /* cipher scheme might require space allocation */ 3087 if (iv_spc && 3088 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3089 goto out; 3090 if (iv_spc) 3091 build.hdr_len += build.key->conf.iv_len; 3092 } 3093 3094 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3095 } 3096 3097 hdr->frame_control = fc; 3098 3099 memcpy(build.hdr + build.hdr_len, 3100 rfc1042_header, sizeof(rfc1042_header)); 3101 build.hdr_len += sizeof(rfc1042_header); 3102 3103 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3104 /* if the kmemdup fails, continue w/o fast_tx */ 3105 if (!fast_tx) 3106 goto out; 3107 3108 out: 3109 /* we might have raced against another call to this function */ 3110 old = rcu_dereference_protected(sta->fast_tx, 3111 lockdep_is_held(&sta->lock)); 3112 rcu_assign_pointer(sta->fast_tx, fast_tx); 3113 if (old) 3114 kfree_rcu(old, rcu_head); 3115 spin_unlock_bh(&sta->lock); 3116 } 3117 3118 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3119 { 3120 struct sta_info *sta; 3121 3122 rcu_read_lock(); 3123 list_for_each_entry_rcu(sta, &local->sta_list, list) 3124 ieee80211_check_fast_xmit(sta); 3125 rcu_read_unlock(); 3126 } 3127 3128 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3129 { 3130 struct ieee80211_local *local = sdata->local; 3131 struct sta_info *sta; 3132 3133 rcu_read_lock(); 3134 3135 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3136 if (sdata != sta->sdata && 3137 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3138 continue; 3139 ieee80211_check_fast_xmit(sta); 3140 } 3141 3142 rcu_read_unlock(); 3143 } 3144 3145 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3146 { 3147 struct ieee80211_fast_tx *fast_tx; 3148 3149 spin_lock_bh(&sta->lock); 3150 fast_tx = rcu_dereference_protected(sta->fast_tx, 3151 lockdep_is_held(&sta->lock)); 3152 RCU_INIT_POINTER(sta->fast_tx, NULL); 3153 spin_unlock_bh(&sta->lock); 3154 3155 if (fast_tx) 3156 kfree_rcu(fast_tx, rcu_head); 3157 } 3158 3159 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3160 struct sk_buff *skb, int headroom) 3161 { 3162 if (skb_headroom(skb) < headroom) { 3163 I802_DEBUG_INC(local->tx_expand_skb_head); 3164 3165 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3166 wiphy_debug(local->hw.wiphy, 3167 "failed to reallocate TX buffer\n"); 3168 return false; 3169 } 3170 } 3171 3172 return true; 3173 } 3174 3175 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3176 struct ieee80211_fast_tx *fast_tx, 3177 struct sk_buff *skb) 3178 { 3179 struct ieee80211_local *local = sdata->local; 3180 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3181 struct ieee80211_hdr *hdr; 3182 struct ethhdr *amsdu_hdr; 3183 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3184 int subframe_len = skb->len - hdr_len; 3185 void *data; 3186 u8 *qc, *h_80211_src, *h_80211_dst; 3187 const u8 *bssid; 3188 3189 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3190 return false; 3191 3192 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3193 return true; 3194 3195 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3196 return false; 3197 3198 data = skb_push(skb, sizeof(*amsdu_hdr)); 3199 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3200 hdr = data; 3201 amsdu_hdr = data + hdr_len; 3202 /* h_80211_src/dst is addr* field within hdr */ 3203 h_80211_src = data + fast_tx->sa_offs; 3204 h_80211_dst = data + fast_tx->da_offs; 3205 3206 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3207 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3208 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3209 3210 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3211 * fields needs to be changed to BSSID for A-MSDU frames depending 3212 * on FromDS/ToDS values. 3213 */ 3214 switch (sdata->vif.type) { 3215 case NL80211_IFTYPE_STATION: 3216 bssid = sdata->u.mgd.bssid; 3217 break; 3218 case NL80211_IFTYPE_AP: 3219 case NL80211_IFTYPE_AP_VLAN: 3220 bssid = sdata->vif.addr; 3221 break; 3222 default: 3223 bssid = NULL; 3224 } 3225 3226 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3227 ether_addr_copy(h_80211_src, bssid); 3228 3229 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3230 ether_addr_copy(h_80211_dst, bssid); 3231 3232 qc = ieee80211_get_qos_ctl(hdr); 3233 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3234 3235 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3236 3237 return true; 3238 } 3239 3240 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3241 struct sta_info *sta, 3242 struct ieee80211_fast_tx *fast_tx, 3243 struct sk_buff *skb) 3244 { 3245 struct ieee80211_local *local = sdata->local; 3246 struct fq *fq = &local->fq; 3247 struct fq_tin *tin; 3248 struct fq_flow *flow; 3249 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3250 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3251 struct txq_info *txqi; 3252 struct sk_buff **frag_tail, *head; 3253 int subframe_len = skb->len - ETH_ALEN; 3254 u8 max_subframes = sta->sta.max_amsdu_subframes; 3255 int max_frags = local->hw.max_tx_fragments; 3256 int max_amsdu_len = sta->sta.max_amsdu_len; 3257 int orig_truesize; 3258 u32 flow_idx; 3259 __be16 len; 3260 void *data; 3261 bool ret = false; 3262 unsigned int orig_len; 3263 int n = 2, nfrags, pad = 0; 3264 u16 hdrlen; 3265 3266 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3267 return false; 3268 3269 if (skb_is_gso(skb)) 3270 return false; 3271 3272 if (!txq) 3273 return false; 3274 3275 txqi = to_txq_info(txq); 3276 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3277 return false; 3278 3279 if (sta->sta.max_rc_amsdu_len) 3280 max_amsdu_len = min_t(int, max_amsdu_len, 3281 sta->sta.max_rc_amsdu_len); 3282 3283 if (sta->sta.max_tid_amsdu_len[tid]) 3284 max_amsdu_len = min_t(int, max_amsdu_len, 3285 sta->sta.max_tid_amsdu_len[tid]); 3286 3287 flow_idx = fq_flow_idx(fq, skb); 3288 3289 spin_lock_bh(&fq->lock); 3290 3291 /* TODO: Ideally aggregation should be done on dequeue to remain 3292 * responsive to environment changes. 3293 */ 3294 3295 tin = &txqi->tin; 3296 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3297 fq_flow_get_default_func); 3298 head = skb_peek_tail(&flow->queue); 3299 if (!head || skb_is_gso(head)) 3300 goto out; 3301 3302 orig_truesize = head->truesize; 3303 orig_len = head->len; 3304 3305 if (skb->len + head->len > max_amsdu_len) 3306 goto out; 3307 3308 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3309 nfrags += 1 + skb_shinfo(head)->nr_frags; 3310 frag_tail = &skb_shinfo(head)->frag_list; 3311 while (*frag_tail) { 3312 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3313 frag_tail = &(*frag_tail)->next; 3314 n++; 3315 } 3316 3317 if (max_subframes && n > max_subframes) 3318 goto out; 3319 3320 if (max_frags && nfrags > max_frags) 3321 goto out; 3322 3323 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3324 goto out; 3325 3326 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3327 goto out; 3328 3329 /* 3330 * Pad out the previous subframe to a multiple of 4 by adding the 3331 * padding to the next one, that's being added. Note that head->len 3332 * is the length of the full A-MSDU, but that works since each time 3333 * we add a new subframe we pad out the previous one to a multiple 3334 * of 4 and thus it no longer matters in the next round. 3335 */ 3336 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3337 if ((head->len - hdrlen) & 3) 3338 pad = 4 - ((head->len - hdrlen) & 3); 3339 3340 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3341 2 + pad)) 3342 goto out_recalc; 3343 3344 ret = true; 3345 data = skb_push(skb, ETH_ALEN + 2); 3346 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3347 3348 data += 2 * ETH_ALEN; 3349 len = cpu_to_be16(subframe_len); 3350 memcpy(data, &len, 2); 3351 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3352 3353 memset(skb_push(skb, pad), 0, pad); 3354 3355 head->len += skb->len; 3356 head->data_len += skb->len; 3357 *frag_tail = skb; 3358 3359 out_recalc: 3360 fq->memory_usage += head->truesize - orig_truesize; 3361 if (head->len != orig_len) { 3362 flow->backlog += head->len - orig_len; 3363 tin->backlog_bytes += head->len - orig_len; 3364 3365 fq_recalc_backlog(fq, tin, flow); 3366 } 3367 out: 3368 spin_unlock_bh(&fq->lock); 3369 3370 return ret; 3371 } 3372 3373 /* 3374 * Can be called while the sta lock is held. Anything that can cause packets to 3375 * be generated will cause deadlock! 3376 */ 3377 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3378 struct sta_info *sta, u8 pn_offs, 3379 struct ieee80211_key *key, 3380 struct sk_buff *skb) 3381 { 3382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3383 struct ieee80211_hdr *hdr = (void *)skb->data; 3384 u8 tid = IEEE80211_NUM_TIDS; 3385 3386 if (key) 3387 info->control.hw_key = &key->conf; 3388 3389 ieee80211_tx_stats(skb->dev, skb->len); 3390 3391 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3392 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3393 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3394 } else { 3395 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3396 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3397 sdata->sequence_number += 0x10; 3398 } 3399 3400 if (skb_shinfo(skb)->gso_size) 3401 sta->tx_stats.msdu[tid] += 3402 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3403 else 3404 sta->tx_stats.msdu[tid]++; 3405 3406 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3407 3408 /* statistics normally done by ieee80211_tx_h_stats (but that 3409 * has to consider fragmentation, so is more complex) 3410 */ 3411 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3412 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3413 3414 if (pn_offs) { 3415 u64 pn; 3416 u8 *crypto_hdr = skb->data + pn_offs; 3417 3418 switch (key->conf.cipher) { 3419 case WLAN_CIPHER_SUITE_CCMP: 3420 case WLAN_CIPHER_SUITE_CCMP_256: 3421 case WLAN_CIPHER_SUITE_GCMP: 3422 case WLAN_CIPHER_SUITE_GCMP_256: 3423 pn = atomic64_inc_return(&key->conf.tx_pn); 3424 crypto_hdr[0] = pn; 3425 crypto_hdr[1] = pn >> 8; 3426 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3427 crypto_hdr[4] = pn >> 16; 3428 crypto_hdr[5] = pn >> 24; 3429 crypto_hdr[6] = pn >> 32; 3430 crypto_hdr[7] = pn >> 40; 3431 break; 3432 } 3433 } 3434 } 3435 3436 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3437 struct sta_info *sta, 3438 struct ieee80211_fast_tx *fast_tx, 3439 struct sk_buff *skb) 3440 { 3441 struct ieee80211_local *local = sdata->local; 3442 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3443 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3444 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3445 struct ethhdr eth; 3446 struct ieee80211_tx_info *info; 3447 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3448 struct ieee80211_tx_data tx; 3449 ieee80211_tx_result r; 3450 struct tid_ampdu_tx *tid_tx = NULL; 3451 u8 tid = IEEE80211_NUM_TIDS; 3452 3453 /* control port protocol needs a lot of special handling */ 3454 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3455 return false; 3456 3457 /* only RFC 1042 SNAP */ 3458 if (ethertype < ETH_P_802_3_MIN) 3459 return false; 3460 3461 /* don't handle TX status request here either */ 3462 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3463 return false; 3464 3465 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3466 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3467 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3468 if (tid_tx) { 3469 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3470 return false; 3471 if (tid_tx->timeout) 3472 tid_tx->last_tx = jiffies; 3473 } 3474 } 3475 3476 /* after this point (skb is modified) we cannot return false */ 3477 3478 if (skb_shared(skb)) { 3479 struct sk_buff *tmp_skb = skb; 3480 3481 skb = skb_clone(skb, GFP_ATOMIC); 3482 kfree_skb(tmp_skb); 3483 3484 if (!skb) 3485 return true; 3486 } 3487 3488 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3489 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3490 return true; 3491 3492 /* will not be crypto-handled beyond what we do here, so use false 3493 * as the may-encrypt argument for the resize to not account for 3494 * more room than we already have in 'extra_head' 3495 */ 3496 if (unlikely(ieee80211_skb_resize(sdata, skb, 3497 max_t(int, extra_head + hw_headroom - 3498 skb_headroom(skb), 0), 3499 false))) { 3500 kfree_skb(skb); 3501 return true; 3502 } 3503 3504 memcpy(ð, skb->data, ETH_HLEN - 2); 3505 hdr = skb_push(skb, extra_head); 3506 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3507 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3508 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3509 3510 info = IEEE80211_SKB_CB(skb); 3511 memset(info, 0, sizeof(*info)); 3512 info->band = fast_tx->band; 3513 info->control.vif = &sdata->vif; 3514 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3515 IEEE80211_TX_CTL_DONTFRAG | 3516 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3517 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3518 3519 #ifdef CONFIG_MAC80211_DEBUGFS 3520 if (local->force_tx_status) 3521 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3522 #endif 3523 3524 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3525 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3526 *ieee80211_get_qos_ctl(hdr) = tid; 3527 } 3528 3529 __skb_queue_head_init(&tx.skbs); 3530 3531 tx.flags = IEEE80211_TX_UNICAST; 3532 tx.local = local; 3533 tx.sdata = sdata; 3534 tx.sta = sta; 3535 tx.key = fast_tx->key; 3536 3537 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3538 tx.skb = skb; 3539 r = ieee80211_tx_h_rate_ctrl(&tx); 3540 skb = tx.skb; 3541 tx.skb = NULL; 3542 3543 if (r != TX_CONTINUE) { 3544 if (r != TX_QUEUED) 3545 kfree_skb(skb); 3546 return true; 3547 } 3548 } 3549 3550 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3551 return true; 3552 3553 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3554 fast_tx->key, skb); 3555 3556 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3557 sdata = container_of(sdata->bss, 3558 struct ieee80211_sub_if_data, u.ap); 3559 3560 __skb_queue_tail(&tx.skbs, skb); 3561 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3562 return true; 3563 } 3564 3565 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3566 struct ieee80211_txq *txq) 3567 { 3568 struct ieee80211_local *local = hw_to_local(hw); 3569 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3570 struct ieee80211_hdr *hdr; 3571 struct sk_buff *skb = NULL; 3572 struct fq *fq = &local->fq; 3573 struct fq_tin *tin = &txqi->tin; 3574 struct ieee80211_tx_info *info; 3575 struct ieee80211_tx_data tx; 3576 ieee80211_tx_result r; 3577 struct ieee80211_vif *vif = txq->vif; 3578 3579 WARN_ON_ONCE(softirq_count() == 0); 3580 3581 if (!ieee80211_txq_airtime_check(hw, txq)) 3582 return NULL; 3583 3584 begin: 3585 spin_lock_bh(&fq->lock); 3586 3587 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3588 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3589 goto out; 3590 3591 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3592 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3593 goto out; 3594 } 3595 3596 /* Make sure fragments stay together. */ 3597 skb = __skb_dequeue(&txqi->frags); 3598 if (skb) 3599 goto out; 3600 3601 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3602 if (!skb) 3603 goto out; 3604 3605 spin_unlock_bh(&fq->lock); 3606 3607 hdr = (struct ieee80211_hdr *)skb->data; 3608 info = IEEE80211_SKB_CB(skb); 3609 3610 memset(&tx, 0, sizeof(tx)); 3611 __skb_queue_head_init(&tx.skbs); 3612 tx.local = local; 3613 tx.skb = skb; 3614 tx.sdata = vif_to_sdata(info->control.vif); 3615 3616 if (txq->sta && !(info->flags & IEEE80211_TX_CTL_INJECTED)) { 3617 tx.sta = container_of(txq->sta, struct sta_info, sta); 3618 /* 3619 * Drop unicast frames to unauthorised stations unless they are 3620 * EAPOL frames from the local station. 3621 */ 3622 if (unlikely(ieee80211_is_data(hdr->frame_control) && 3623 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3624 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3625 !is_multicast_ether_addr(hdr->addr1) && 3626 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3627 (!(info->control.flags & 3628 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3629 !ether_addr_equal(tx.sdata->vif.addr, 3630 hdr->addr2)))) { 3631 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3632 ieee80211_free_txskb(&local->hw, skb); 3633 goto begin; 3634 } 3635 } 3636 3637 /* 3638 * The key can be removed while the packet was queued, so need to call 3639 * this here to get the current key. 3640 */ 3641 r = ieee80211_tx_h_select_key(&tx); 3642 if (r != TX_CONTINUE) { 3643 ieee80211_free_txskb(&local->hw, skb); 3644 goto begin; 3645 } 3646 3647 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3648 info->flags |= IEEE80211_TX_CTL_AMPDU; 3649 else 3650 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3651 3652 if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) 3653 goto encap_out; 3654 3655 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3656 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3657 sta); 3658 u8 pn_offs = 0; 3659 3660 if (tx.key && 3661 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3662 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3663 3664 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3665 tx.key, skb); 3666 } else { 3667 if (invoke_tx_handlers_late(&tx)) 3668 goto begin; 3669 3670 skb = __skb_dequeue(&tx.skbs); 3671 3672 if (!skb_queue_empty(&tx.skbs)) { 3673 spin_lock_bh(&fq->lock); 3674 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3675 spin_unlock_bh(&fq->lock); 3676 } 3677 } 3678 3679 if (skb_has_frag_list(skb) && 3680 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3681 if (skb_linearize(skb)) { 3682 ieee80211_free_txskb(&local->hw, skb); 3683 goto begin; 3684 } 3685 } 3686 3687 switch (tx.sdata->vif.type) { 3688 case NL80211_IFTYPE_MONITOR: 3689 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3690 vif = &tx.sdata->vif; 3691 break; 3692 } 3693 tx.sdata = rcu_dereference(local->monitor_sdata); 3694 if (tx.sdata) { 3695 vif = &tx.sdata->vif; 3696 info->hw_queue = 3697 vif->hw_queue[skb_get_queue_mapping(skb)]; 3698 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3699 ieee80211_free_txskb(&local->hw, skb); 3700 goto begin; 3701 } else { 3702 vif = NULL; 3703 } 3704 break; 3705 case NL80211_IFTYPE_AP_VLAN: 3706 tx.sdata = container_of(tx.sdata->bss, 3707 struct ieee80211_sub_if_data, u.ap); 3708 fallthrough; 3709 default: 3710 vif = &tx.sdata->vif; 3711 break; 3712 } 3713 3714 encap_out: 3715 IEEE80211_SKB_CB(skb)->control.vif = vif; 3716 3717 if (vif && 3718 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3719 bool ampdu = txq->ac != IEEE80211_AC_VO; 3720 u32 airtime; 3721 3722 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3723 skb->len, ampdu); 3724 if (airtime) { 3725 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3726 ieee80211_sta_update_pending_airtime(local, tx.sta, 3727 txq->ac, 3728 airtime, 3729 false); 3730 } 3731 } 3732 3733 return skb; 3734 3735 out: 3736 spin_unlock_bh(&fq->lock); 3737 3738 return skb; 3739 } 3740 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3741 3742 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3743 { 3744 struct ieee80211_local *local = hw_to_local(hw); 3745 struct ieee80211_txq *ret = NULL; 3746 struct txq_info *txqi = NULL, *head = NULL; 3747 bool found_eligible_txq = false; 3748 3749 spin_lock_bh(&local->active_txq_lock[ac]); 3750 3751 begin: 3752 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3753 struct txq_info, 3754 schedule_order); 3755 if (!txqi) 3756 goto out; 3757 3758 if (txqi == head) { 3759 if (!found_eligible_txq) 3760 goto out; 3761 else 3762 found_eligible_txq = false; 3763 } 3764 3765 if (!head) 3766 head = txqi; 3767 3768 if (txqi->txq.sta) { 3769 struct sta_info *sta = container_of(txqi->txq.sta, 3770 struct sta_info, sta); 3771 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3772 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3773 3774 if (aql_check) 3775 found_eligible_txq = true; 3776 3777 if (deficit < 0) 3778 sta->airtime[txqi->txq.ac].deficit += 3779 sta->airtime_weight; 3780 3781 if (deficit < 0 || !aql_check) { 3782 list_move_tail(&txqi->schedule_order, 3783 &local->active_txqs[txqi->txq.ac]); 3784 goto begin; 3785 } 3786 } 3787 3788 3789 if (txqi->schedule_round == local->schedule_round[ac]) 3790 goto out; 3791 3792 list_del_init(&txqi->schedule_order); 3793 txqi->schedule_round = local->schedule_round[ac]; 3794 ret = &txqi->txq; 3795 3796 out: 3797 spin_unlock_bh(&local->active_txq_lock[ac]); 3798 return ret; 3799 } 3800 EXPORT_SYMBOL(ieee80211_next_txq); 3801 3802 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3803 struct ieee80211_txq *txq, 3804 bool force) 3805 { 3806 struct ieee80211_local *local = hw_to_local(hw); 3807 struct txq_info *txqi = to_txq_info(txq); 3808 3809 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3810 3811 if (list_empty(&txqi->schedule_order) && 3812 (force || !skb_queue_empty(&txqi->frags) || 3813 txqi->tin.backlog_packets)) { 3814 /* If airtime accounting is active, always enqueue STAs at the 3815 * head of the list to ensure that they only get moved to the 3816 * back by the airtime DRR scheduler once they have a negative 3817 * deficit. A station that already has a negative deficit will 3818 * get immediately moved to the back of the list on the next 3819 * call to ieee80211_next_txq(). 3820 */ 3821 if (txqi->txq.sta && 3822 wiphy_ext_feature_isset(local->hw.wiphy, 3823 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3824 list_add(&txqi->schedule_order, 3825 &local->active_txqs[txq->ac]); 3826 else 3827 list_add_tail(&txqi->schedule_order, 3828 &local->active_txqs[txq->ac]); 3829 } 3830 3831 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3832 } 3833 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3834 3835 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3836 struct ieee80211_txq *txq) 3837 { 3838 struct sta_info *sta; 3839 struct ieee80211_local *local = hw_to_local(hw); 3840 3841 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3842 return true; 3843 3844 if (!txq->sta) 3845 return true; 3846 3847 sta = container_of(txq->sta, struct sta_info, sta); 3848 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3849 sta->airtime[txq->ac].aql_limit_low) 3850 return true; 3851 3852 if (atomic_read(&local->aql_total_pending_airtime) < 3853 local->aql_threshold && 3854 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3855 sta->airtime[txq->ac].aql_limit_high) 3856 return true; 3857 3858 return false; 3859 } 3860 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3861 3862 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3863 struct ieee80211_txq *txq) 3864 { 3865 struct ieee80211_local *local = hw_to_local(hw); 3866 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3867 struct sta_info *sta; 3868 u8 ac = txq->ac; 3869 3870 spin_lock_bh(&local->active_txq_lock[ac]); 3871 3872 if (!txqi->txq.sta) 3873 goto out; 3874 3875 if (list_empty(&txqi->schedule_order)) 3876 goto out; 3877 3878 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3879 schedule_order) { 3880 if (iter == txqi) 3881 break; 3882 3883 if (!iter->txq.sta) { 3884 list_move_tail(&iter->schedule_order, 3885 &local->active_txqs[ac]); 3886 continue; 3887 } 3888 sta = container_of(iter->txq.sta, struct sta_info, sta); 3889 if (sta->airtime[ac].deficit < 0) 3890 sta->airtime[ac].deficit += sta->airtime_weight; 3891 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3892 } 3893 3894 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3895 if (sta->airtime[ac].deficit >= 0) 3896 goto out; 3897 3898 sta->airtime[ac].deficit += sta->airtime_weight; 3899 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3900 spin_unlock_bh(&local->active_txq_lock[ac]); 3901 3902 return false; 3903 out: 3904 if (!list_empty(&txqi->schedule_order)) 3905 list_del_init(&txqi->schedule_order); 3906 spin_unlock_bh(&local->active_txq_lock[ac]); 3907 3908 return true; 3909 } 3910 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3911 3912 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3913 { 3914 struct ieee80211_local *local = hw_to_local(hw); 3915 3916 spin_lock_bh(&local->active_txq_lock[ac]); 3917 local->schedule_round[ac]++; 3918 spin_unlock_bh(&local->active_txq_lock[ac]); 3919 } 3920 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3921 3922 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3923 struct net_device *dev, 3924 u32 info_flags, 3925 u32 ctrl_flags, 3926 u64 *cookie) 3927 { 3928 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3929 struct ieee80211_local *local = sdata->local; 3930 struct sta_info *sta; 3931 struct sk_buff *next; 3932 3933 if (unlikely(skb->len < ETH_HLEN)) { 3934 kfree_skb(skb); 3935 return; 3936 } 3937 3938 rcu_read_lock(); 3939 3940 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3941 goto out_free; 3942 3943 if (IS_ERR(sta)) 3944 sta = NULL; 3945 3946 if (local->ops->wake_tx_queue) { 3947 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3948 skb_set_queue_mapping(skb, queue); 3949 skb_get_hash(skb); 3950 } 3951 3952 if (sta) { 3953 struct ieee80211_fast_tx *fast_tx; 3954 3955 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3956 3957 fast_tx = rcu_dereference(sta->fast_tx); 3958 3959 if (fast_tx && 3960 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3961 goto out; 3962 } 3963 3964 if (skb_is_gso(skb)) { 3965 struct sk_buff *segs; 3966 3967 segs = skb_gso_segment(skb, 0); 3968 if (IS_ERR(segs)) { 3969 goto out_free; 3970 } else if (segs) { 3971 consume_skb(skb); 3972 skb = segs; 3973 } 3974 } else { 3975 /* we cannot process non-linear frames on this path */ 3976 if (skb_linearize(skb)) { 3977 kfree_skb(skb); 3978 goto out; 3979 } 3980 3981 /* the frame could be fragmented, software-encrypted, and other 3982 * things so we cannot really handle checksum offload with it - 3983 * fix it up in software before we handle anything else. 3984 */ 3985 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3986 skb_set_transport_header(skb, 3987 skb_checksum_start_offset(skb)); 3988 if (skb_checksum_help(skb)) 3989 goto out_free; 3990 } 3991 } 3992 3993 skb_list_walk_safe(skb, skb, next) { 3994 skb_mark_not_on_list(skb); 3995 3996 if (skb->protocol == sdata->control_port_protocol) 3997 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 3998 3999 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4000 sta, ctrl_flags, cookie); 4001 if (IS_ERR(skb)) { 4002 kfree_skb_list(next); 4003 goto out; 4004 } 4005 4006 ieee80211_tx_stats(dev, skb->len); 4007 4008 ieee80211_xmit(sdata, sta, skb); 4009 } 4010 goto out; 4011 out_free: 4012 kfree_skb(skb); 4013 out: 4014 rcu_read_unlock(); 4015 } 4016 4017 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4018 { 4019 struct ethhdr *eth; 4020 int err; 4021 4022 err = skb_ensure_writable(skb, ETH_HLEN); 4023 if (unlikely(err)) 4024 return err; 4025 4026 eth = (void *)skb->data; 4027 ether_addr_copy(eth->h_dest, sta->sta.addr); 4028 4029 return 0; 4030 } 4031 4032 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4033 struct net_device *dev) 4034 { 4035 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4036 const struct ethhdr *eth = (void *)skb->data; 4037 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4038 __be16 ethertype; 4039 4040 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4041 return false; 4042 4043 switch (sdata->vif.type) { 4044 case NL80211_IFTYPE_AP_VLAN: 4045 if (sdata->u.vlan.sta) 4046 return false; 4047 if (sdata->wdev.use_4addr) 4048 return false; 4049 fallthrough; 4050 case NL80211_IFTYPE_AP: 4051 /* check runtime toggle for this bss */ 4052 if (!sdata->bss->multicast_to_unicast) 4053 return false; 4054 break; 4055 default: 4056 return false; 4057 } 4058 4059 /* multicast to unicast conversion only for some payload */ 4060 ethertype = eth->h_proto; 4061 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4062 ethertype = ethvlan->h_vlan_encapsulated_proto; 4063 switch (ethertype) { 4064 case htons(ETH_P_ARP): 4065 case htons(ETH_P_IP): 4066 case htons(ETH_P_IPV6): 4067 break; 4068 default: 4069 return false; 4070 } 4071 4072 return true; 4073 } 4074 4075 static void 4076 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4077 struct sk_buff_head *queue) 4078 { 4079 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4080 struct ieee80211_local *local = sdata->local; 4081 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4082 struct sta_info *sta, *first = NULL; 4083 struct sk_buff *cloned_skb; 4084 4085 rcu_read_lock(); 4086 4087 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4088 if (sdata != sta->sdata) 4089 /* AP-VLAN mismatch */ 4090 continue; 4091 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4092 /* do not send back to source */ 4093 continue; 4094 if (!first) { 4095 first = sta; 4096 continue; 4097 } 4098 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4099 if (!cloned_skb) 4100 goto multicast; 4101 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4102 dev_kfree_skb(cloned_skb); 4103 goto multicast; 4104 } 4105 __skb_queue_tail(queue, cloned_skb); 4106 } 4107 4108 if (likely(first)) { 4109 if (unlikely(ieee80211_change_da(skb, first))) 4110 goto multicast; 4111 __skb_queue_tail(queue, skb); 4112 } else { 4113 /* no STA connected, drop */ 4114 kfree_skb(skb); 4115 skb = NULL; 4116 } 4117 4118 goto out; 4119 multicast: 4120 __skb_queue_purge(queue); 4121 __skb_queue_tail(queue, skb); 4122 out: 4123 rcu_read_unlock(); 4124 } 4125 4126 /** 4127 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4128 * @skb: packet to be sent 4129 * @dev: incoming interface 4130 * 4131 * On failure skb will be freed. 4132 */ 4133 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4134 struct net_device *dev) 4135 { 4136 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4137 struct sk_buff_head queue; 4138 4139 __skb_queue_head_init(&queue); 4140 ieee80211_convert_to_unicast(skb, dev, &queue); 4141 while ((skb = __skb_dequeue(&queue))) 4142 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4143 } else { 4144 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4145 } 4146 4147 return NETDEV_TX_OK; 4148 } 4149 4150 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4151 struct sk_buff *skb, int led_len, 4152 struct sta_info *sta, 4153 bool txpending) 4154 { 4155 struct ieee80211_local *local = sdata->local; 4156 struct ieee80211_tx_control control = {}; 4157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4158 struct ieee80211_sta *pubsta = NULL; 4159 unsigned long flags; 4160 int q = info->hw_queue; 4161 4162 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4163 return true; 4164 4165 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4166 4167 if (local->queue_stop_reasons[q] || 4168 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4169 if (txpending) 4170 skb_queue_head(&local->pending[q], skb); 4171 else 4172 skb_queue_tail(&local->pending[q], skb); 4173 4174 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4175 4176 return false; 4177 } 4178 4179 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4180 4181 if (sta && sta->uploaded) 4182 pubsta = &sta->sta; 4183 4184 control.sta = pubsta; 4185 4186 drv_tx(local, &control, skb); 4187 4188 return true; 4189 } 4190 4191 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4192 struct net_device *dev, struct sta_info *sta, 4193 struct sk_buff *skb) 4194 { 4195 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4196 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4197 struct ieee80211_local *local = sdata->local; 4198 bool authorized = false; 4199 bool multicast; 4200 unsigned char *ra = ehdr->h_dest; 4201 4202 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4203 sta = NULL; 4204 4205 if (sdata->vif.type == NL80211_IFTYPE_STATION && 4206 (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER))) 4207 ra = sdata->u.mgd.bssid; 4208 4209 if (is_zero_ether_addr(ra)) 4210 goto out_free; 4211 4212 multicast = is_multicast_ether_addr(ra); 4213 4214 if (sta) 4215 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 4216 4217 if (!multicast && !authorized && 4218 (ehdr->h_proto != sdata->control_port_protocol || 4219 !ether_addr_equal(sdata->vif.addr, ehdr->h_source))) 4220 goto out_free; 4221 4222 if (multicast && sdata->vif.type == NL80211_IFTYPE_AP && 4223 !atomic_read(&sdata->u.ap.num_mcast_sta)) 4224 goto out_free; 4225 4226 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4227 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4228 goto out_free; 4229 4230 memset(info, 0, sizeof(*info)); 4231 4232 if (unlikely(!multicast && skb->sk && 4233 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4234 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4235 &info->flags, NULL); 4236 4237 if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) { 4238 if (sdata->control_port_no_encrypt) 4239 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4240 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 4241 } 4242 4243 if (multicast) 4244 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4245 4246 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4247 4248 ieee80211_tx_stats(dev, skb->len); 4249 4250 if (sta) { 4251 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4252 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4253 } 4254 4255 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4256 sdata = container_of(sdata->bss, 4257 struct ieee80211_sub_if_data, u.ap); 4258 4259 info->control.flags |= IEEE80211_TX_CTRL_HW_80211_ENCAP; 4260 info->control.vif = &sdata->vif; 4261 4262 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4263 4264 return; 4265 4266 out_free: 4267 kfree_skb(skb); 4268 } 4269 4270 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4271 struct net_device *dev) 4272 { 4273 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4274 struct sta_info *sta; 4275 4276 if (WARN_ON(!sdata->hw_80211_encap)) { 4277 kfree_skb(skb); 4278 return NETDEV_TX_OK; 4279 } 4280 4281 if (unlikely(skb->len < ETH_HLEN)) { 4282 kfree_skb(skb); 4283 return NETDEV_TX_OK; 4284 } 4285 4286 rcu_read_lock(); 4287 4288 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4289 kfree_skb(skb); 4290 else 4291 ieee80211_8023_xmit(sdata, dev, sta, skb); 4292 4293 rcu_read_unlock(); 4294 4295 return NETDEV_TX_OK; 4296 } 4297 4298 struct sk_buff * 4299 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4300 struct sk_buff *skb, u32 info_flags) 4301 { 4302 struct ieee80211_hdr *hdr; 4303 struct ieee80211_tx_data tx = { 4304 .local = sdata->local, 4305 .sdata = sdata, 4306 }; 4307 struct sta_info *sta; 4308 4309 rcu_read_lock(); 4310 4311 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4312 kfree_skb(skb); 4313 skb = ERR_PTR(-EINVAL); 4314 goto out; 4315 } 4316 4317 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4318 if (IS_ERR(skb)) 4319 goto out; 4320 4321 hdr = (void *)skb->data; 4322 tx.sta = sta_info_get(sdata, hdr->addr1); 4323 tx.skb = skb; 4324 4325 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4326 rcu_read_unlock(); 4327 kfree_skb(skb); 4328 return ERR_PTR(-EINVAL); 4329 } 4330 4331 out: 4332 rcu_read_unlock(); 4333 return skb; 4334 } 4335 4336 /* 4337 * ieee80211_clear_tx_pending may not be called in a context where 4338 * it is possible that it packets could come in again. 4339 */ 4340 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4341 { 4342 struct sk_buff *skb; 4343 int i; 4344 4345 for (i = 0; i < local->hw.queues; i++) { 4346 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4347 ieee80211_free_txskb(&local->hw, skb); 4348 } 4349 } 4350 4351 /* 4352 * Returns false if the frame couldn't be transmitted but was queued instead, 4353 * which in this case means re-queued -- take as an indication to stop sending 4354 * more pending frames. 4355 */ 4356 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4357 struct sk_buff *skb) 4358 { 4359 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4360 struct ieee80211_sub_if_data *sdata; 4361 struct sta_info *sta; 4362 struct ieee80211_hdr *hdr; 4363 bool result; 4364 struct ieee80211_chanctx_conf *chanctx_conf; 4365 4366 sdata = vif_to_sdata(info->control.vif); 4367 4368 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 4369 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4370 if (unlikely(!chanctx_conf)) { 4371 dev_kfree_skb(skb); 4372 return true; 4373 } 4374 info->band = chanctx_conf->def.chan->band; 4375 result = ieee80211_tx(sdata, NULL, skb, true); 4376 } else if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) { 4377 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4378 dev_kfree_skb(skb); 4379 return true; 4380 } 4381 4382 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4383 sta = NULL; 4384 4385 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4386 } else { 4387 struct sk_buff_head skbs; 4388 4389 __skb_queue_head_init(&skbs); 4390 __skb_queue_tail(&skbs, skb); 4391 4392 hdr = (struct ieee80211_hdr *)skb->data; 4393 sta = sta_info_get(sdata, hdr->addr1); 4394 4395 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4396 } 4397 4398 return result; 4399 } 4400 4401 /* 4402 * Transmit all pending packets. Called from tasklet. 4403 */ 4404 void ieee80211_tx_pending(unsigned long data) 4405 { 4406 struct ieee80211_local *local = (struct ieee80211_local *)data; 4407 unsigned long flags; 4408 int i; 4409 bool txok; 4410 4411 rcu_read_lock(); 4412 4413 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4414 for (i = 0; i < local->hw.queues; i++) { 4415 /* 4416 * If queue is stopped by something other than due to pending 4417 * frames, or we have no pending frames, proceed to next queue. 4418 */ 4419 if (local->queue_stop_reasons[i] || 4420 skb_queue_empty(&local->pending[i])) 4421 continue; 4422 4423 while (!skb_queue_empty(&local->pending[i])) { 4424 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4425 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4426 4427 if (WARN_ON(!info->control.vif)) { 4428 ieee80211_free_txskb(&local->hw, skb); 4429 continue; 4430 } 4431 4432 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4433 flags); 4434 4435 txok = ieee80211_tx_pending_skb(local, skb); 4436 spin_lock_irqsave(&local->queue_stop_reason_lock, 4437 flags); 4438 if (!txok) 4439 break; 4440 } 4441 4442 if (skb_queue_empty(&local->pending[i])) 4443 ieee80211_propagate_queue_wake(local, i); 4444 } 4445 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4446 4447 rcu_read_unlock(); 4448 } 4449 4450 /* functions for drivers to get certain frames */ 4451 4452 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4453 struct ps_data *ps, struct sk_buff *skb, 4454 bool is_template) 4455 { 4456 u8 *pos, *tim; 4457 int aid0 = 0; 4458 int i, have_bits = 0, n1, n2; 4459 4460 /* Generate bitmap for TIM only if there are any STAs in power save 4461 * mode. */ 4462 if (atomic_read(&ps->num_sta_ps) > 0) 4463 /* in the hope that this is faster than 4464 * checking byte-for-byte */ 4465 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4466 IEEE80211_MAX_AID+1); 4467 if (!is_template) { 4468 if (ps->dtim_count == 0) 4469 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4470 else 4471 ps->dtim_count--; 4472 } 4473 4474 tim = pos = skb_put(skb, 6); 4475 *pos++ = WLAN_EID_TIM; 4476 *pos++ = 4; 4477 *pos++ = ps->dtim_count; 4478 *pos++ = sdata->vif.bss_conf.dtim_period; 4479 4480 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4481 aid0 = 1; 4482 4483 ps->dtim_bc_mc = aid0 == 1; 4484 4485 if (have_bits) { 4486 /* Find largest even number N1 so that bits numbered 1 through 4487 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4488 * (N2 + 1) x 8 through 2007 are 0. */ 4489 n1 = 0; 4490 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4491 if (ps->tim[i]) { 4492 n1 = i & 0xfe; 4493 break; 4494 } 4495 } 4496 n2 = n1; 4497 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4498 if (ps->tim[i]) { 4499 n2 = i; 4500 break; 4501 } 4502 } 4503 4504 /* Bitmap control */ 4505 *pos++ = n1 | aid0; 4506 /* Part Virt Bitmap */ 4507 skb_put(skb, n2 - n1); 4508 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4509 4510 tim[1] = n2 - n1 + 4; 4511 } else { 4512 *pos++ = aid0; /* Bitmap control */ 4513 *pos++ = 0; /* Part Virt Bitmap */ 4514 } 4515 } 4516 4517 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4518 struct ps_data *ps, struct sk_buff *skb, 4519 bool is_template) 4520 { 4521 struct ieee80211_local *local = sdata->local; 4522 4523 /* 4524 * Not very nice, but we want to allow the driver to call 4525 * ieee80211_beacon_get() as a response to the set_tim() 4526 * callback. That, however, is already invoked under the 4527 * sta_lock to guarantee consistent and race-free update 4528 * of the tim bitmap in mac80211 and the driver. 4529 */ 4530 if (local->tim_in_locked_section) { 4531 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4532 } else { 4533 spin_lock_bh(&local->tim_lock); 4534 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4535 spin_unlock_bh(&local->tim_lock); 4536 } 4537 4538 return 0; 4539 } 4540 4541 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4542 struct beacon_data *beacon) 4543 { 4544 struct probe_resp *resp; 4545 u8 *beacon_data; 4546 size_t beacon_data_len; 4547 int i; 4548 u8 count = beacon->csa_current_counter; 4549 4550 switch (sdata->vif.type) { 4551 case NL80211_IFTYPE_AP: 4552 beacon_data = beacon->tail; 4553 beacon_data_len = beacon->tail_len; 4554 break; 4555 case NL80211_IFTYPE_ADHOC: 4556 beacon_data = beacon->head; 4557 beacon_data_len = beacon->head_len; 4558 break; 4559 case NL80211_IFTYPE_MESH_POINT: 4560 beacon_data = beacon->head; 4561 beacon_data_len = beacon->head_len; 4562 break; 4563 default: 4564 return; 4565 } 4566 4567 rcu_read_lock(); 4568 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4569 resp = rcu_dereference(sdata->u.ap.probe_resp); 4570 4571 if (beacon->csa_counter_offsets[i]) { 4572 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4573 beacon_data_len)) { 4574 rcu_read_unlock(); 4575 return; 4576 } 4577 4578 beacon_data[beacon->csa_counter_offsets[i]] = count; 4579 } 4580 4581 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4582 resp->data[resp->csa_counter_offsets[i]] = count; 4583 } 4584 rcu_read_unlock(); 4585 } 4586 4587 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4588 { 4589 beacon->csa_current_counter--; 4590 4591 /* the counter should never reach 0 */ 4592 WARN_ON_ONCE(!beacon->csa_current_counter); 4593 4594 return beacon->csa_current_counter; 4595 } 4596 4597 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4598 { 4599 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4600 struct beacon_data *beacon = NULL; 4601 u8 count = 0; 4602 4603 rcu_read_lock(); 4604 4605 if (sdata->vif.type == NL80211_IFTYPE_AP) 4606 beacon = rcu_dereference(sdata->u.ap.beacon); 4607 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4608 beacon = rcu_dereference(sdata->u.ibss.presp); 4609 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4610 beacon = rcu_dereference(sdata->u.mesh.beacon); 4611 4612 if (!beacon) 4613 goto unlock; 4614 4615 count = __ieee80211_csa_update_counter(beacon); 4616 4617 unlock: 4618 rcu_read_unlock(); 4619 return count; 4620 } 4621 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4622 4623 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4624 { 4625 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4626 struct beacon_data *beacon = NULL; 4627 4628 rcu_read_lock(); 4629 4630 if (sdata->vif.type == NL80211_IFTYPE_AP) 4631 beacon = rcu_dereference(sdata->u.ap.beacon); 4632 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4633 beacon = rcu_dereference(sdata->u.ibss.presp); 4634 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4635 beacon = rcu_dereference(sdata->u.mesh.beacon); 4636 4637 if (!beacon) 4638 goto unlock; 4639 4640 if (counter < beacon->csa_current_counter) 4641 beacon->csa_current_counter = counter; 4642 4643 unlock: 4644 rcu_read_unlock(); 4645 } 4646 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4647 4648 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4649 { 4650 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4651 struct beacon_data *beacon = NULL; 4652 u8 *beacon_data; 4653 size_t beacon_data_len; 4654 int ret = false; 4655 4656 if (!ieee80211_sdata_running(sdata)) 4657 return false; 4658 4659 rcu_read_lock(); 4660 if (vif->type == NL80211_IFTYPE_AP) { 4661 struct ieee80211_if_ap *ap = &sdata->u.ap; 4662 4663 beacon = rcu_dereference(ap->beacon); 4664 if (WARN_ON(!beacon || !beacon->tail)) 4665 goto out; 4666 beacon_data = beacon->tail; 4667 beacon_data_len = beacon->tail_len; 4668 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4669 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4670 4671 beacon = rcu_dereference(ifibss->presp); 4672 if (!beacon) 4673 goto out; 4674 4675 beacon_data = beacon->head; 4676 beacon_data_len = beacon->head_len; 4677 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4678 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4679 4680 beacon = rcu_dereference(ifmsh->beacon); 4681 if (!beacon) 4682 goto out; 4683 4684 beacon_data = beacon->head; 4685 beacon_data_len = beacon->head_len; 4686 } else { 4687 WARN_ON(1); 4688 goto out; 4689 } 4690 4691 if (!beacon->csa_counter_offsets[0]) 4692 goto out; 4693 4694 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4695 goto out; 4696 4697 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4698 ret = true; 4699 out: 4700 rcu_read_unlock(); 4701 4702 return ret; 4703 } 4704 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4705 4706 static int ieee80211_beacon_protect(struct sk_buff *skb, 4707 struct ieee80211_local *local, 4708 struct ieee80211_sub_if_data *sdata) 4709 { 4710 ieee80211_tx_result res; 4711 struct ieee80211_tx_data tx; 4712 struct sk_buff *check_skb; 4713 4714 memset(&tx, 0, sizeof(tx)); 4715 tx.key = rcu_dereference(sdata->default_beacon_key); 4716 if (!tx.key) 4717 return 0; 4718 tx.local = local; 4719 tx.sdata = sdata; 4720 __skb_queue_head_init(&tx.skbs); 4721 __skb_queue_tail(&tx.skbs, skb); 4722 res = ieee80211_tx_h_encrypt(&tx); 4723 check_skb = __skb_dequeue(&tx.skbs); 4724 /* we may crash after this, but it'd be a bug in crypto */ 4725 WARN_ON(check_skb != skb); 4726 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4727 return -EINVAL; 4728 4729 return 0; 4730 } 4731 4732 static struct sk_buff * 4733 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4734 struct ieee80211_vif *vif, 4735 struct ieee80211_mutable_offsets *offs, 4736 bool is_template) 4737 { 4738 struct ieee80211_local *local = hw_to_local(hw); 4739 struct beacon_data *beacon = NULL; 4740 struct sk_buff *skb = NULL; 4741 struct ieee80211_tx_info *info; 4742 struct ieee80211_sub_if_data *sdata = NULL; 4743 enum nl80211_band band; 4744 struct ieee80211_tx_rate_control txrc; 4745 struct ieee80211_chanctx_conf *chanctx_conf; 4746 int csa_off_base = 0; 4747 4748 rcu_read_lock(); 4749 4750 sdata = vif_to_sdata(vif); 4751 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4752 4753 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4754 goto out; 4755 4756 if (offs) 4757 memset(offs, 0, sizeof(*offs)); 4758 4759 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4760 struct ieee80211_if_ap *ap = &sdata->u.ap; 4761 4762 beacon = rcu_dereference(ap->beacon); 4763 if (beacon) { 4764 if (beacon->csa_counter_offsets[0]) { 4765 if (!is_template) 4766 __ieee80211_csa_update_counter(beacon); 4767 4768 ieee80211_set_csa(sdata, beacon); 4769 } 4770 4771 /* 4772 * headroom, head length, 4773 * tail length and maximum TIM length 4774 */ 4775 skb = dev_alloc_skb(local->tx_headroom + 4776 beacon->head_len + 4777 beacon->tail_len + 256 + 4778 local->hw.extra_beacon_tailroom); 4779 if (!skb) 4780 goto out; 4781 4782 skb_reserve(skb, local->tx_headroom); 4783 skb_put_data(skb, beacon->head, beacon->head_len); 4784 4785 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4786 is_template); 4787 4788 if (offs) { 4789 offs->tim_offset = beacon->head_len; 4790 offs->tim_length = skb->len - beacon->head_len; 4791 4792 /* for AP the csa offsets are from tail */ 4793 csa_off_base = skb->len; 4794 } 4795 4796 if (beacon->tail) 4797 skb_put_data(skb, beacon->tail, 4798 beacon->tail_len); 4799 4800 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4801 goto out; 4802 } else 4803 goto out; 4804 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4805 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4806 struct ieee80211_hdr *hdr; 4807 4808 beacon = rcu_dereference(ifibss->presp); 4809 if (!beacon) 4810 goto out; 4811 4812 if (beacon->csa_counter_offsets[0]) { 4813 if (!is_template) 4814 __ieee80211_csa_update_counter(beacon); 4815 4816 ieee80211_set_csa(sdata, beacon); 4817 } 4818 4819 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4820 local->hw.extra_beacon_tailroom); 4821 if (!skb) 4822 goto out; 4823 skb_reserve(skb, local->tx_headroom); 4824 skb_put_data(skb, beacon->head, beacon->head_len); 4825 4826 hdr = (struct ieee80211_hdr *) skb->data; 4827 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4828 IEEE80211_STYPE_BEACON); 4829 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4830 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4831 4832 beacon = rcu_dereference(ifmsh->beacon); 4833 if (!beacon) 4834 goto out; 4835 4836 if (beacon->csa_counter_offsets[0]) { 4837 if (!is_template) 4838 /* TODO: For mesh csa_counter is in TU, so 4839 * decrementing it by one isn't correct, but 4840 * for now we leave it consistent with overall 4841 * mac80211's behavior. 4842 */ 4843 __ieee80211_csa_update_counter(beacon); 4844 4845 ieee80211_set_csa(sdata, beacon); 4846 } 4847 4848 if (ifmsh->sync_ops) 4849 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4850 4851 skb = dev_alloc_skb(local->tx_headroom + 4852 beacon->head_len + 4853 256 + /* TIM IE */ 4854 beacon->tail_len + 4855 local->hw.extra_beacon_tailroom); 4856 if (!skb) 4857 goto out; 4858 skb_reserve(skb, local->tx_headroom); 4859 skb_put_data(skb, beacon->head, beacon->head_len); 4860 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4861 4862 if (offs) { 4863 offs->tim_offset = beacon->head_len; 4864 offs->tim_length = skb->len - beacon->head_len; 4865 } 4866 4867 skb_put_data(skb, beacon->tail, beacon->tail_len); 4868 } else { 4869 WARN_ON(1); 4870 goto out; 4871 } 4872 4873 /* CSA offsets */ 4874 if (offs && beacon) { 4875 int i; 4876 4877 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4878 u16 csa_off = beacon->csa_counter_offsets[i]; 4879 4880 if (!csa_off) 4881 continue; 4882 4883 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4884 } 4885 } 4886 4887 band = chanctx_conf->def.chan->band; 4888 4889 info = IEEE80211_SKB_CB(skb); 4890 4891 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4892 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4893 info->band = band; 4894 4895 memset(&txrc, 0, sizeof(txrc)); 4896 txrc.hw = hw; 4897 txrc.sband = local->hw.wiphy->bands[band]; 4898 txrc.bss_conf = &sdata->vif.bss_conf; 4899 txrc.skb = skb; 4900 txrc.reported_rate.idx = -1; 4901 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4902 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4903 else 4904 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4905 txrc.bss = true; 4906 rate_control_get_rate(sdata, NULL, &txrc); 4907 4908 info->control.vif = vif; 4909 4910 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4911 IEEE80211_TX_CTL_ASSIGN_SEQ | 4912 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4913 out: 4914 rcu_read_unlock(); 4915 return skb; 4916 4917 } 4918 4919 struct sk_buff * 4920 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4921 struct ieee80211_vif *vif, 4922 struct ieee80211_mutable_offsets *offs) 4923 { 4924 return __ieee80211_beacon_get(hw, vif, offs, true); 4925 } 4926 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4927 4928 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4929 struct ieee80211_vif *vif, 4930 u16 *tim_offset, u16 *tim_length) 4931 { 4932 struct ieee80211_mutable_offsets offs = {}; 4933 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4934 struct sk_buff *copy; 4935 struct ieee80211_supported_band *sband; 4936 int shift; 4937 4938 if (!bcn) 4939 return bcn; 4940 4941 if (tim_offset) 4942 *tim_offset = offs.tim_offset; 4943 4944 if (tim_length) 4945 *tim_length = offs.tim_length; 4946 4947 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4948 !hw_to_local(hw)->monitors) 4949 return bcn; 4950 4951 /* send a copy to monitor interfaces */ 4952 copy = skb_copy(bcn, GFP_ATOMIC); 4953 if (!copy) 4954 return bcn; 4955 4956 shift = ieee80211_vif_get_shift(vif); 4957 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4958 if (!sband) 4959 return bcn; 4960 4961 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4962 NULL); 4963 4964 return bcn; 4965 } 4966 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4967 4968 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4969 struct ieee80211_vif *vif) 4970 { 4971 struct ieee80211_if_ap *ap = NULL; 4972 struct sk_buff *skb = NULL; 4973 struct probe_resp *presp = NULL; 4974 struct ieee80211_hdr *hdr; 4975 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4976 4977 if (sdata->vif.type != NL80211_IFTYPE_AP) 4978 return NULL; 4979 4980 rcu_read_lock(); 4981 4982 ap = &sdata->u.ap; 4983 presp = rcu_dereference(ap->probe_resp); 4984 if (!presp) 4985 goto out; 4986 4987 skb = dev_alloc_skb(presp->len); 4988 if (!skb) 4989 goto out; 4990 4991 skb_put_data(skb, presp->data, presp->len); 4992 4993 hdr = (struct ieee80211_hdr *) skb->data; 4994 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4995 4996 out: 4997 rcu_read_unlock(); 4998 return skb; 4999 } 5000 EXPORT_SYMBOL(ieee80211_proberesp_get); 5001 5002 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5003 struct ieee80211_vif *vif) 5004 { 5005 struct ieee80211_sub_if_data *sdata; 5006 struct ieee80211_if_managed *ifmgd; 5007 struct ieee80211_pspoll *pspoll; 5008 struct ieee80211_local *local; 5009 struct sk_buff *skb; 5010 5011 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5012 return NULL; 5013 5014 sdata = vif_to_sdata(vif); 5015 ifmgd = &sdata->u.mgd; 5016 local = sdata->local; 5017 5018 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5019 if (!skb) 5020 return NULL; 5021 5022 skb_reserve(skb, local->hw.extra_tx_headroom); 5023 5024 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5025 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5026 IEEE80211_STYPE_PSPOLL); 5027 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5028 5029 /* aid in PS-Poll has its two MSBs each set to 1 */ 5030 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5031 5032 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5033 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5034 5035 return skb; 5036 } 5037 EXPORT_SYMBOL(ieee80211_pspoll_get); 5038 5039 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5040 struct ieee80211_vif *vif, 5041 bool qos_ok) 5042 { 5043 struct ieee80211_hdr_3addr *nullfunc; 5044 struct ieee80211_sub_if_data *sdata; 5045 struct ieee80211_if_managed *ifmgd; 5046 struct ieee80211_local *local; 5047 struct sk_buff *skb; 5048 bool qos = false; 5049 5050 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5051 return NULL; 5052 5053 sdata = vif_to_sdata(vif); 5054 ifmgd = &sdata->u.mgd; 5055 local = sdata->local; 5056 5057 if (qos_ok) { 5058 struct sta_info *sta; 5059 5060 rcu_read_lock(); 5061 sta = sta_info_get(sdata, ifmgd->bssid); 5062 qos = sta && sta->sta.wme; 5063 rcu_read_unlock(); 5064 } 5065 5066 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5067 sizeof(*nullfunc) + 2); 5068 if (!skb) 5069 return NULL; 5070 5071 skb_reserve(skb, local->hw.extra_tx_headroom); 5072 5073 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5074 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5075 IEEE80211_STYPE_NULLFUNC | 5076 IEEE80211_FCTL_TODS); 5077 if (qos) { 5078 __le16 qoshdr = cpu_to_le16(7); 5079 5080 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5081 IEEE80211_STYPE_NULLFUNC) != 5082 IEEE80211_STYPE_QOS_NULLFUNC); 5083 nullfunc->frame_control |= 5084 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5085 skb->priority = 7; 5086 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5087 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5088 } 5089 5090 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5091 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5092 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5093 5094 return skb; 5095 } 5096 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5097 5098 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5099 const u8 *src_addr, 5100 const u8 *ssid, size_t ssid_len, 5101 size_t tailroom) 5102 { 5103 struct ieee80211_local *local = hw_to_local(hw); 5104 struct ieee80211_hdr_3addr *hdr; 5105 struct sk_buff *skb; 5106 size_t ie_ssid_len; 5107 u8 *pos; 5108 5109 ie_ssid_len = 2 + ssid_len; 5110 5111 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5112 ie_ssid_len + tailroom); 5113 if (!skb) 5114 return NULL; 5115 5116 skb_reserve(skb, local->hw.extra_tx_headroom); 5117 5118 hdr = skb_put_zero(skb, sizeof(*hdr)); 5119 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5120 IEEE80211_STYPE_PROBE_REQ); 5121 eth_broadcast_addr(hdr->addr1); 5122 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5123 eth_broadcast_addr(hdr->addr3); 5124 5125 pos = skb_put(skb, ie_ssid_len); 5126 *pos++ = WLAN_EID_SSID; 5127 *pos++ = ssid_len; 5128 if (ssid_len) 5129 memcpy(pos, ssid, ssid_len); 5130 pos += ssid_len; 5131 5132 return skb; 5133 } 5134 EXPORT_SYMBOL(ieee80211_probereq_get); 5135 5136 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5137 const void *frame, size_t frame_len, 5138 const struct ieee80211_tx_info *frame_txctl, 5139 struct ieee80211_rts *rts) 5140 { 5141 const struct ieee80211_hdr *hdr = frame; 5142 5143 rts->frame_control = 5144 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5145 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5146 frame_txctl); 5147 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5148 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5149 } 5150 EXPORT_SYMBOL(ieee80211_rts_get); 5151 5152 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5153 const void *frame, size_t frame_len, 5154 const struct ieee80211_tx_info *frame_txctl, 5155 struct ieee80211_cts *cts) 5156 { 5157 const struct ieee80211_hdr *hdr = frame; 5158 5159 cts->frame_control = 5160 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5161 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5162 frame_len, frame_txctl); 5163 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5164 } 5165 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5166 5167 struct sk_buff * 5168 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5169 struct ieee80211_vif *vif) 5170 { 5171 struct ieee80211_local *local = hw_to_local(hw); 5172 struct sk_buff *skb = NULL; 5173 struct ieee80211_tx_data tx; 5174 struct ieee80211_sub_if_data *sdata; 5175 struct ps_data *ps; 5176 struct ieee80211_tx_info *info; 5177 struct ieee80211_chanctx_conf *chanctx_conf; 5178 5179 sdata = vif_to_sdata(vif); 5180 5181 rcu_read_lock(); 5182 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5183 5184 if (!chanctx_conf) 5185 goto out; 5186 5187 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5188 struct beacon_data *beacon = 5189 rcu_dereference(sdata->u.ap.beacon); 5190 5191 if (!beacon || !beacon->head) 5192 goto out; 5193 5194 ps = &sdata->u.ap.ps; 5195 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5196 ps = &sdata->u.mesh.ps; 5197 } else { 5198 goto out; 5199 } 5200 5201 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5202 goto out; /* send buffered bc/mc only after DTIM beacon */ 5203 5204 while (1) { 5205 skb = skb_dequeue(&ps->bc_buf); 5206 if (!skb) 5207 goto out; 5208 local->total_ps_buffered--; 5209 5210 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5211 struct ieee80211_hdr *hdr = 5212 (struct ieee80211_hdr *) skb->data; 5213 /* more buffered multicast/broadcast frames ==> set 5214 * MoreData flag in IEEE 802.11 header to inform PS 5215 * STAs */ 5216 hdr->frame_control |= 5217 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5218 } 5219 5220 if (sdata->vif.type == NL80211_IFTYPE_AP) 5221 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5222 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5223 break; 5224 ieee80211_free_txskb(hw, skb); 5225 } 5226 5227 info = IEEE80211_SKB_CB(skb); 5228 5229 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5230 info->band = chanctx_conf->def.chan->band; 5231 5232 if (invoke_tx_handlers(&tx)) 5233 skb = NULL; 5234 out: 5235 rcu_read_unlock(); 5236 5237 return skb; 5238 } 5239 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5240 5241 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5242 { 5243 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5244 struct ieee80211_sub_if_data *sdata = sta->sdata; 5245 struct ieee80211_local *local = sdata->local; 5246 int ret; 5247 u32 queues; 5248 5249 lockdep_assert_held(&local->sta_mtx); 5250 5251 /* only some cases are supported right now */ 5252 switch (sdata->vif.type) { 5253 case NL80211_IFTYPE_STATION: 5254 case NL80211_IFTYPE_AP: 5255 case NL80211_IFTYPE_AP_VLAN: 5256 break; 5257 default: 5258 WARN_ON(1); 5259 return -EINVAL; 5260 } 5261 5262 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5263 return -EINVAL; 5264 5265 if (sta->reserved_tid == tid) { 5266 ret = 0; 5267 goto out; 5268 } 5269 5270 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5271 sdata_err(sdata, "TID reservation already active\n"); 5272 ret = -EALREADY; 5273 goto out; 5274 } 5275 5276 ieee80211_stop_vif_queues(sdata->local, sdata, 5277 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5278 5279 synchronize_net(); 5280 5281 /* Tear down BA sessions so we stop aggregating on this TID */ 5282 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5283 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5284 __ieee80211_stop_tx_ba_session(sta, tid, 5285 AGG_STOP_LOCAL_REQUEST); 5286 } 5287 5288 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5289 __ieee80211_flush_queues(local, sdata, queues, false); 5290 5291 sta->reserved_tid = tid; 5292 5293 ieee80211_wake_vif_queues(local, sdata, 5294 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5295 5296 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5297 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5298 5299 ret = 0; 5300 out: 5301 return ret; 5302 } 5303 EXPORT_SYMBOL(ieee80211_reserve_tid); 5304 5305 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5306 { 5307 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5308 struct ieee80211_sub_if_data *sdata = sta->sdata; 5309 5310 lockdep_assert_held(&sdata->local->sta_mtx); 5311 5312 /* only some cases are supported right now */ 5313 switch (sdata->vif.type) { 5314 case NL80211_IFTYPE_STATION: 5315 case NL80211_IFTYPE_AP: 5316 case NL80211_IFTYPE_AP_VLAN: 5317 break; 5318 default: 5319 WARN_ON(1); 5320 return; 5321 } 5322 5323 if (tid != sta->reserved_tid) { 5324 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5325 return; 5326 } 5327 5328 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5329 } 5330 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5331 5332 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5333 struct sk_buff *skb, int tid, 5334 enum nl80211_band band) 5335 { 5336 int ac = ieee80211_ac_from_tid(tid); 5337 5338 skb_reset_mac_header(skb); 5339 skb_set_queue_mapping(skb, ac); 5340 skb->priority = tid; 5341 5342 skb->dev = sdata->dev; 5343 5344 /* 5345 * The other path calling ieee80211_xmit is from the tasklet, 5346 * and while we can handle concurrent transmissions locking 5347 * requirements are that we do not come into tx with bhs on. 5348 */ 5349 local_bh_disable(); 5350 IEEE80211_SKB_CB(skb)->band = band; 5351 ieee80211_xmit(sdata, NULL, skb); 5352 local_bh_enable(); 5353 } 5354 5355 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5356 const u8 *buf, size_t len, 5357 const u8 *dest, __be16 proto, bool unencrypted, 5358 u64 *cookie) 5359 { 5360 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5361 struct ieee80211_local *local = sdata->local; 5362 struct sk_buff *skb; 5363 struct ethhdr *ehdr; 5364 u32 ctrl_flags = 0; 5365 u32 flags = 0; 5366 5367 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5368 * or Pre-Authentication 5369 */ 5370 if (proto != sdata->control_port_protocol && 5371 proto != cpu_to_be16(ETH_P_PREAUTH)) 5372 return -EINVAL; 5373 5374 if (proto == sdata->control_port_protocol) 5375 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5376 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5377 5378 if (unencrypted) 5379 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5380 5381 if (cookie) 5382 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5383 5384 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX | 5385 IEEE80211_TX_CTL_INJECTED; 5386 5387 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5388 sizeof(struct ethhdr) + len); 5389 if (!skb) 5390 return -ENOMEM; 5391 5392 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5393 5394 skb_put_data(skb, buf, len); 5395 5396 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5397 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5398 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5399 ehdr->h_proto = proto; 5400 5401 skb->dev = dev; 5402 skb->protocol = htons(ETH_P_802_3); 5403 skb_reset_network_header(skb); 5404 skb_reset_mac_header(skb); 5405 5406 /* mutex lock is only needed for incrementing the cookie counter */ 5407 mutex_lock(&local->mtx); 5408 5409 local_bh_disable(); 5410 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5411 local_bh_enable(); 5412 5413 mutex_unlock(&local->mtx); 5414 5415 return 0; 5416 } 5417 5418 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5419 const u8 *buf, size_t len) 5420 { 5421 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5422 struct ieee80211_local *local = sdata->local; 5423 struct sk_buff *skb; 5424 5425 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5426 30 + /* header size */ 5427 18); /* 11s header size */ 5428 if (!skb) 5429 return -ENOMEM; 5430 5431 skb_reserve(skb, local->hw.extra_tx_headroom); 5432 skb_put_data(skb, buf, len); 5433 5434 skb->dev = dev; 5435 skb->protocol = htons(ETH_P_802_3); 5436 skb_reset_network_header(skb); 5437 skb_reset_mac_header(skb); 5438 5439 local_bh_disable(); 5440 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5441 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5442 NULL); 5443 local_bh_enable(); 5444 5445 return 0; 5446 } 5447