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 /* device is expected to do this */ 86 if (sband->band == NL80211_BAND_S1GHZ) 87 return 0; 88 89 /* 90 * data and mgmt (except PS Poll): 91 * - during CFP: 32768 92 * - during contention period: 93 * if addr1 is group address: 0 94 * if more fragments = 0 and addr1 is individual address: time to 95 * transmit one ACK plus SIFS 96 * if more fragments = 1 and addr1 is individual address: time to 97 * transmit next fragment plus 2 x ACK plus 3 x SIFS 98 * 99 * IEEE 802.11, 9.6: 100 * - control response frame (CTS or ACK) shall be transmitted using the 101 * same rate as the immediately previous frame in the frame exchange 102 * sequence, if this rate belongs to the PHY mandatory rates, or else 103 * at the highest possible rate belonging to the PHY rates in the 104 * BSSBasicRateSet 105 */ 106 hdr = (struct ieee80211_hdr *)skb->data; 107 if (ieee80211_is_ctl(hdr->frame_control)) { 108 /* TODO: These control frames are not currently sent by 109 * mac80211, but should they be implemented, this function 110 * needs to be updated to support duration field calculation. 111 * 112 * RTS: time needed to transmit pending data/mgmt frame plus 113 * one CTS frame plus one ACK frame plus 3 x SIFS 114 * CTS: duration of immediately previous RTS minus time 115 * required to transmit CTS and its SIFS 116 * ACK: 0 if immediately previous directed data/mgmt had 117 * more=0, with more=1 duration in ACK frame is duration 118 * from previous frame minus time needed to transmit ACK 119 * and its SIFS 120 * PS Poll: BIT(15) | BIT(14) | aid 121 */ 122 return 0; 123 } 124 125 /* data/mgmt */ 126 if (0 /* FIX: data/mgmt during CFP */) 127 return cpu_to_le16(32768); 128 129 if (group_addr) /* Group address as the destination - no ACK */ 130 return 0; 131 132 /* Individual destination address: 133 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 134 * CTS and ACK frames shall be transmitted using the highest rate in 135 * basic rate set that is less than or equal to the rate of the 136 * immediately previous frame and that is using the same modulation 137 * (CCK or OFDM). If no basic rate set matches with these requirements, 138 * the highest mandatory rate of the PHY that is less than or equal to 139 * the rate of the previous frame is used. 140 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 141 */ 142 rate = -1; 143 /* use lowest available if everything fails */ 144 mrate = sband->bitrates[0].bitrate; 145 for (i = 0; i < sband->n_bitrates; i++) { 146 struct ieee80211_rate *r = &sband->bitrates[i]; 147 148 if (r->bitrate > txrate->bitrate) 149 break; 150 151 if ((rate_flags & r->flags) != rate_flags) 152 continue; 153 154 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 155 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 156 157 switch (sband->band) { 158 case NL80211_BAND_2GHZ: { 159 u32 flag; 160 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 161 flag = IEEE80211_RATE_MANDATORY_G; 162 else 163 flag = IEEE80211_RATE_MANDATORY_B; 164 if (r->flags & flag) 165 mrate = r->bitrate; 166 break; 167 } 168 case NL80211_BAND_5GHZ: 169 case NL80211_BAND_6GHZ: 170 if (r->flags & IEEE80211_RATE_MANDATORY_A) 171 mrate = r->bitrate; 172 break; 173 case NL80211_BAND_S1GHZ: 174 case NL80211_BAND_60GHZ: 175 /* TODO, for now fall through */ 176 case NUM_NL80211_BANDS: 177 WARN_ON(1); 178 break; 179 } 180 } 181 if (rate == -1) { 182 /* No matching basic rate found; use highest suitable mandatory 183 * PHY rate */ 184 rate = DIV_ROUND_UP(mrate, 1 << shift); 185 } 186 187 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 188 if (ieee80211_is_data_qos(hdr->frame_control) && 189 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 190 dur = 0; 191 else 192 /* Time needed to transmit ACK 193 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 194 * to closest integer */ 195 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 196 tx->sdata->vif.bss_conf.use_short_preamble, 197 shift); 198 199 if (next_frag_len) { 200 /* Frame is fragmented: duration increases with time needed to 201 * transmit next fragment plus ACK and 2 x SIFS. */ 202 dur *= 2; /* ACK + SIFS */ 203 /* next fragment */ 204 dur += ieee80211_frame_duration(sband->band, next_frag_len, 205 txrate->bitrate, erp, 206 tx->sdata->vif.bss_conf.use_short_preamble, 207 shift); 208 } 209 210 return cpu_to_le16(dur); 211 } 212 213 /* tx handlers */ 214 static ieee80211_tx_result debug_noinline 215 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 216 { 217 struct ieee80211_local *local = tx->local; 218 struct ieee80211_if_managed *ifmgd; 219 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 220 221 /* driver doesn't support power save */ 222 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 223 return TX_CONTINUE; 224 225 /* hardware does dynamic power save */ 226 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 227 return TX_CONTINUE; 228 229 /* dynamic power save disabled */ 230 if (local->hw.conf.dynamic_ps_timeout <= 0) 231 return TX_CONTINUE; 232 233 /* we are scanning, don't enable power save */ 234 if (local->scanning) 235 return TX_CONTINUE; 236 237 if (!local->ps_sdata) 238 return TX_CONTINUE; 239 240 /* No point if we're going to suspend */ 241 if (local->quiescing) 242 return TX_CONTINUE; 243 244 /* dynamic ps is supported only in managed mode */ 245 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 246 return TX_CONTINUE; 247 248 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 249 return TX_CONTINUE; 250 251 ifmgd = &tx->sdata->u.mgd; 252 253 /* 254 * Don't wakeup from power save if u-apsd is enabled, voip ac has 255 * u-apsd enabled and the frame is in voip class. This effectively 256 * means that even if all access categories have u-apsd enabled, in 257 * practise u-apsd is only used with the voip ac. This is a 258 * workaround for the case when received voip class packets do not 259 * have correct qos tag for some reason, due the network or the 260 * peer application. 261 * 262 * Note: ifmgd->uapsd_queues access is racy here. If the value is 263 * changed via debugfs, user needs to reassociate manually to have 264 * everything in sync. 265 */ 266 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 267 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 268 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 269 return TX_CONTINUE; 270 271 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 272 ieee80211_stop_queues_by_reason(&local->hw, 273 IEEE80211_MAX_QUEUE_MAP, 274 IEEE80211_QUEUE_STOP_REASON_PS, 275 false); 276 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 277 ieee80211_queue_work(&local->hw, 278 &local->dynamic_ps_disable_work); 279 } 280 281 /* Don't restart the timer if we're not disassociated */ 282 if (!ifmgd->associated) 283 return TX_CONTINUE; 284 285 mod_timer(&local->dynamic_ps_timer, jiffies + 286 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 287 288 return TX_CONTINUE; 289 } 290 291 static ieee80211_tx_result debug_noinline 292 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 293 { 294 295 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 296 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 297 bool assoc = false; 298 299 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 300 return TX_CONTINUE; 301 302 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 303 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 304 !ieee80211_is_probe_req(hdr->frame_control) && 305 !ieee80211_is_any_nullfunc(hdr->frame_control)) 306 /* 307 * When software scanning only nullfunc frames (to notify 308 * the sleep state to the AP) and probe requests (for the 309 * active scan) are allowed, all other frames should not be 310 * sent and we should not get here, but if we do 311 * nonetheless, drop them to avoid sending them 312 * off-channel. See the link below and 313 * ieee80211_start_scan() for more. 314 * 315 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 316 */ 317 return TX_DROP; 318 319 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 320 return TX_CONTINUE; 321 322 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 323 return TX_CONTINUE; 324 325 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 326 return TX_CONTINUE; 327 328 if (tx->sta) 329 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 330 331 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 332 if (unlikely(!assoc && 333 ieee80211_is_data(hdr->frame_control))) { 334 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 335 sdata_info(tx->sdata, 336 "dropped data frame to not associated station %pM\n", 337 hdr->addr1); 338 #endif 339 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 340 return TX_DROP; 341 } 342 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 343 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 344 /* 345 * No associated STAs - no need to send multicast 346 * frames. 347 */ 348 return TX_DROP; 349 } 350 351 return TX_CONTINUE; 352 } 353 354 /* This function is called whenever the AP is about to exceed the maximum limit 355 * of buffered frames for power saving STAs. This situation should not really 356 * happen often during normal operation, so dropping the oldest buffered packet 357 * from each queue should be OK to make some room for new frames. */ 358 static void purge_old_ps_buffers(struct ieee80211_local *local) 359 { 360 int total = 0, purged = 0; 361 struct sk_buff *skb; 362 struct ieee80211_sub_if_data *sdata; 363 struct sta_info *sta; 364 365 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 366 struct ps_data *ps; 367 368 if (sdata->vif.type == NL80211_IFTYPE_AP) 369 ps = &sdata->u.ap.ps; 370 else if (ieee80211_vif_is_mesh(&sdata->vif)) 371 ps = &sdata->u.mesh.ps; 372 else 373 continue; 374 375 skb = skb_dequeue(&ps->bc_buf); 376 if (skb) { 377 purged++; 378 ieee80211_free_txskb(&local->hw, skb); 379 } 380 total += skb_queue_len(&ps->bc_buf); 381 } 382 383 /* 384 * Drop one frame from each station from the lowest-priority 385 * AC that has frames at all. 386 */ 387 list_for_each_entry_rcu(sta, &local->sta_list, list) { 388 int ac; 389 390 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 391 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 392 total += skb_queue_len(&sta->ps_tx_buf[ac]); 393 if (skb) { 394 purged++; 395 ieee80211_free_txskb(&local->hw, skb); 396 break; 397 } 398 } 399 } 400 401 local->total_ps_buffered = total; 402 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 403 } 404 405 static ieee80211_tx_result 406 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 407 { 408 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 409 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 410 struct ps_data *ps; 411 412 /* 413 * broadcast/multicast frame 414 * 415 * If any of the associated/peer stations is in power save mode, 416 * the frame is buffered to be sent after DTIM beacon frame. 417 * This is done either by the hardware or us. 418 */ 419 420 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 421 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 422 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 423 if (!tx->sdata->bss) 424 return TX_CONTINUE; 425 426 ps = &tx->sdata->bss->ps; 427 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 428 ps = &tx->sdata->u.mesh.ps; 429 } else { 430 return TX_CONTINUE; 431 } 432 433 434 /* no buffering for ordered frames */ 435 if (ieee80211_has_order(hdr->frame_control)) 436 return TX_CONTINUE; 437 438 if (ieee80211_is_probe_req(hdr->frame_control)) 439 return TX_CONTINUE; 440 441 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 442 info->hw_queue = tx->sdata->vif.cab_queue; 443 444 /* no stations in PS mode and no buffered packets */ 445 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 446 return TX_CONTINUE; 447 448 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 449 450 /* device releases frame after DTIM beacon */ 451 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 452 return TX_CONTINUE; 453 454 /* buffered in mac80211 */ 455 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 456 purge_old_ps_buffers(tx->local); 457 458 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 459 ps_dbg(tx->sdata, 460 "BC TX buffer full - dropping the oldest frame\n"); 461 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 462 } else 463 tx->local->total_ps_buffered++; 464 465 skb_queue_tail(&ps->bc_buf, tx->skb); 466 467 return TX_QUEUED; 468 } 469 470 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 471 struct sk_buff *skb) 472 { 473 if (!ieee80211_is_mgmt(fc)) 474 return 0; 475 476 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 477 return 0; 478 479 if (!ieee80211_is_robust_mgmt_frame(skb)) 480 return 0; 481 482 return 1; 483 } 484 485 static ieee80211_tx_result 486 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 487 { 488 struct sta_info *sta = tx->sta; 489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 490 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 491 struct ieee80211_local *local = tx->local; 492 493 if (unlikely(!sta)) 494 return TX_CONTINUE; 495 496 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 497 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 498 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 499 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 500 int ac = skb_get_queue_mapping(tx->skb); 501 502 if (ieee80211_is_mgmt(hdr->frame_control) && 503 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 504 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 505 return TX_CONTINUE; 506 } 507 508 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 509 sta->sta.addr, sta->sta.aid, ac); 510 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 511 purge_old_ps_buffers(tx->local); 512 513 /* sync with ieee80211_sta_ps_deliver_wakeup */ 514 spin_lock(&sta->ps_lock); 515 /* 516 * STA woke up the meantime and all the frames on ps_tx_buf have 517 * been queued to pending queue. No reordering can happen, go 518 * ahead and Tx the packet. 519 */ 520 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 521 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 522 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 523 spin_unlock(&sta->ps_lock); 524 return TX_CONTINUE; 525 } 526 527 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 528 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 529 ps_dbg(tx->sdata, 530 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 531 sta->sta.addr, ac); 532 ieee80211_free_txskb(&local->hw, old); 533 } else 534 tx->local->total_ps_buffered++; 535 536 info->control.jiffies = jiffies; 537 info->control.vif = &tx->sdata->vif; 538 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 539 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 540 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 541 spin_unlock(&sta->ps_lock); 542 543 if (!timer_pending(&local->sta_cleanup)) 544 mod_timer(&local->sta_cleanup, 545 round_jiffies(jiffies + 546 STA_INFO_CLEANUP_INTERVAL)); 547 548 /* 549 * We queued up some frames, so the TIM bit might 550 * need to be set, recalculate it. 551 */ 552 sta_info_recalc_tim(sta); 553 554 return TX_QUEUED; 555 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 556 ps_dbg(tx->sdata, 557 "STA %pM in PS mode, but polling/in SP -> send frame\n", 558 sta->sta.addr); 559 } 560 561 return TX_CONTINUE; 562 } 563 564 static ieee80211_tx_result debug_noinline 565 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 566 { 567 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 568 return TX_CONTINUE; 569 570 if (tx->flags & IEEE80211_TX_UNICAST) 571 return ieee80211_tx_h_unicast_ps_buf(tx); 572 else 573 return ieee80211_tx_h_multicast_ps_buf(tx); 574 } 575 576 static ieee80211_tx_result debug_noinline 577 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 578 { 579 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 580 581 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 582 if (tx->sdata->control_port_no_encrypt) 583 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 584 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 585 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 586 } 587 588 return TX_CONTINUE; 589 } 590 591 static ieee80211_tx_result debug_noinline 592 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 593 { 594 struct ieee80211_key *key; 595 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 596 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 597 598 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 599 tx->key = NULL; 600 return TX_CONTINUE; 601 } 602 603 if (tx->sta && 604 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 605 tx->key = key; 606 else if (ieee80211_is_group_privacy_action(tx->skb) && 607 (key = rcu_dereference(tx->sdata->default_multicast_key))) 608 tx->key = key; 609 else if (ieee80211_is_mgmt(hdr->frame_control) && 610 is_multicast_ether_addr(hdr->addr1) && 611 ieee80211_is_robust_mgmt_frame(tx->skb) && 612 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 613 tx->key = key; 614 else if (is_multicast_ether_addr(hdr->addr1) && 615 (key = rcu_dereference(tx->sdata->default_multicast_key))) 616 tx->key = key; 617 else if (!is_multicast_ether_addr(hdr->addr1) && 618 (key = rcu_dereference(tx->sdata->default_unicast_key))) 619 tx->key = key; 620 else 621 tx->key = NULL; 622 623 if (tx->key) { 624 bool skip_hw = false; 625 626 /* TODO: add threshold stuff again */ 627 628 switch (tx->key->conf.cipher) { 629 case WLAN_CIPHER_SUITE_WEP40: 630 case WLAN_CIPHER_SUITE_WEP104: 631 case WLAN_CIPHER_SUITE_TKIP: 632 if (!ieee80211_is_data_present(hdr->frame_control)) 633 tx->key = NULL; 634 break; 635 case WLAN_CIPHER_SUITE_CCMP: 636 case WLAN_CIPHER_SUITE_CCMP_256: 637 case WLAN_CIPHER_SUITE_GCMP: 638 case WLAN_CIPHER_SUITE_GCMP_256: 639 if (!ieee80211_is_data_present(hdr->frame_control) && 640 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 641 tx->skb) && 642 !ieee80211_is_group_privacy_action(tx->skb)) 643 tx->key = NULL; 644 else 645 skip_hw = (tx->key->conf.flags & 646 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 647 ieee80211_is_mgmt(hdr->frame_control); 648 break; 649 case WLAN_CIPHER_SUITE_AES_CMAC: 650 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 651 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 652 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 653 if (!ieee80211_is_mgmt(hdr->frame_control)) 654 tx->key = NULL; 655 break; 656 } 657 658 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 659 !ieee80211_is_deauth(hdr->frame_control))) 660 return TX_DROP; 661 662 if (!skip_hw && tx->key && 663 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 664 info->control.hw_key = &tx->key->conf; 665 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta && 666 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 667 return TX_DROP; 668 } 669 670 return TX_CONTINUE; 671 } 672 673 static ieee80211_tx_result debug_noinline 674 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 675 { 676 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 677 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 678 struct ieee80211_supported_band *sband; 679 u32 len; 680 struct ieee80211_tx_rate_control txrc; 681 struct ieee80211_sta_rates *ratetbl = NULL; 682 bool assoc = false; 683 684 memset(&txrc, 0, sizeof(txrc)); 685 686 sband = tx->local->hw.wiphy->bands[info->band]; 687 688 len = min_t(u32, tx->skb->len + FCS_LEN, 689 tx->local->hw.wiphy->frag_threshold); 690 691 /* set up the tx rate control struct we give the RC algo */ 692 txrc.hw = &tx->local->hw; 693 txrc.sband = sband; 694 txrc.bss_conf = &tx->sdata->vif.bss_conf; 695 txrc.skb = tx->skb; 696 txrc.reported_rate.idx = -1; 697 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 698 699 if (tx->sdata->rc_has_mcs_mask[info->band]) 700 txrc.rate_idx_mcs_mask = 701 tx->sdata->rc_rateidx_mcs_mask[info->band]; 702 703 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 704 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 705 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 706 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 707 708 /* set up RTS protection if desired */ 709 if (len > tx->local->hw.wiphy->rts_threshold) { 710 txrc.rts = true; 711 } 712 713 info->control.use_rts = txrc.rts; 714 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 715 716 /* 717 * Use short preamble if the BSS can handle it, but not for 718 * management frames unless we know the receiver can handle 719 * that -- the management frame might be to a station that 720 * just wants a probe response. 721 */ 722 if (tx->sdata->vif.bss_conf.use_short_preamble && 723 (ieee80211_is_data(hdr->frame_control) || 724 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 725 txrc.short_preamble = true; 726 727 info->control.short_preamble = txrc.short_preamble; 728 729 /* don't ask rate control when rate already injected via radiotap */ 730 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 731 return TX_CONTINUE; 732 733 if (tx->sta) 734 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 735 736 /* 737 * Lets not bother rate control if we're associated and cannot 738 * talk to the sta. This should not happen. 739 */ 740 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 741 !rate_usable_index_exists(sband, &tx->sta->sta), 742 "%s: Dropped data frame as no usable bitrate found while " 743 "scanning and associated. Target station: " 744 "%pM on %d GHz band\n", 745 tx->sdata->name, hdr->addr1, 746 info->band ? 5 : 2)) 747 return TX_DROP; 748 749 /* 750 * If we're associated with the sta at this point we know we can at 751 * least send the frame at the lowest bit rate. 752 */ 753 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 754 755 if (tx->sta && !info->control.skip_table) 756 ratetbl = rcu_dereference(tx->sta->sta.rates); 757 758 if (unlikely(info->control.rates[0].idx < 0)) { 759 if (ratetbl) { 760 struct ieee80211_tx_rate rate = { 761 .idx = ratetbl->rate[0].idx, 762 .flags = ratetbl->rate[0].flags, 763 .count = ratetbl->rate[0].count 764 }; 765 766 if (ratetbl->rate[0].idx < 0) 767 return TX_DROP; 768 769 tx->rate = rate; 770 } else { 771 return TX_DROP; 772 } 773 } else { 774 tx->rate = info->control.rates[0]; 775 } 776 777 if (txrc.reported_rate.idx < 0) { 778 txrc.reported_rate = tx->rate; 779 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 780 tx->sta->tx_stats.last_rate = txrc.reported_rate; 781 } else if (tx->sta) 782 tx->sta->tx_stats.last_rate = txrc.reported_rate; 783 784 if (ratetbl) 785 return TX_CONTINUE; 786 787 if (unlikely(!info->control.rates[0].count)) 788 info->control.rates[0].count = 1; 789 790 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 791 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 792 info->control.rates[0].count = 1; 793 794 return TX_CONTINUE; 795 } 796 797 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 798 { 799 u16 *seq = &sta->tid_seq[tid]; 800 __le16 ret = cpu_to_le16(*seq); 801 802 /* Increase the sequence number. */ 803 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 804 805 return ret; 806 } 807 808 static ieee80211_tx_result debug_noinline 809 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 810 { 811 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 812 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 813 int tid; 814 815 /* 816 * Packet injection may want to control the sequence 817 * number, if we have no matching interface then we 818 * neither assign one ourselves nor ask the driver to. 819 */ 820 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 821 return TX_CONTINUE; 822 823 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 824 return TX_CONTINUE; 825 826 if (ieee80211_hdrlen(hdr->frame_control) < 24) 827 return TX_CONTINUE; 828 829 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 830 return TX_CONTINUE; 831 832 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 833 return TX_CONTINUE; 834 835 /* 836 * Anything but QoS data that has a sequence number field 837 * (is long enough) gets a sequence number from the global 838 * counter. QoS data frames with a multicast destination 839 * also use the global counter (802.11-2012 9.3.2.10). 840 */ 841 if (!ieee80211_is_data_qos(hdr->frame_control) || 842 is_multicast_ether_addr(hdr->addr1)) { 843 /* driver should assign sequence number */ 844 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 845 /* for pure STA mode without beacons, we can do it */ 846 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 847 tx->sdata->sequence_number += 0x10; 848 if (tx->sta) 849 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 850 return TX_CONTINUE; 851 } 852 853 /* 854 * This should be true for injected/management frames only, for 855 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 856 * above since they are not QoS-data frames. 857 */ 858 if (!tx->sta) 859 return TX_CONTINUE; 860 861 /* include per-STA, per-TID sequence counter */ 862 tid = ieee80211_get_tid(hdr); 863 tx->sta->tx_stats.msdu[tid]++; 864 865 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 866 867 return TX_CONTINUE; 868 } 869 870 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 871 struct sk_buff *skb, int hdrlen, 872 int frag_threshold) 873 { 874 struct ieee80211_local *local = tx->local; 875 struct ieee80211_tx_info *info; 876 struct sk_buff *tmp; 877 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 878 int pos = hdrlen + per_fragm; 879 int rem = skb->len - hdrlen - per_fragm; 880 881 if (WARN_ON(rem < 0)) 882 return -EINVAL; 883 884 /* first fragment was already added to queue by caller */ 885 886 while (rem) { 887 int fraglen = per_fragm; 888 889 if (fraglen > rem) 890 fraglen = rem; 891 rem -= fraglen; 892 tmp = dev_alloc_skb(local->tx_headroom + 893 frag_threshold + 894 tx->sdata->encrypt_headroom + 895 IEEE80211_ENCRYPT_TAILROOM); 896 if (!tmp) 897 return -ENOMEM; 898 899 __skb_queue_tail(&tx->skbs, tmp); 900 901 skb_reserve(tmp, 902 local->tx_headroom + tx->sdata->encrypt_headroom); 903 904 /* copy control information */ 905 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 906 907 info = IEEE80211_SKB_CB(tmp); 908 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 909 IEEE80211_TX_CTL_FIRST_FRAGMENT); 910 911 if (rem) 912 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 913 914 skb_copy_queue_mapping(tmp, skb); 915 tmp->priority = skb->priority; 916 tmp->dev = skb->dev; 917 918 /* copy header and data */ 919 skb_put_data(tmp, skb->data, hdrlen); 920 skb_put_data(tmp, skb->data + pos, fraglen); 921 922 pos += fraglen; 923 } 924 925 /* adjust first fragment's length */ 926 skb_trim(skb, hdrlen + per_fragm); 927 return 0; 928 } 929 930 static ieee80211_tx_result debug_noinline 931 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 932 { 933 struct sk_buff *skb = tx->skb; 934 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 935 struct ieee80211_hdr *hdr = (void *)skb->data; 936 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 937 int hdrlen; 938 int fragnum; 939 940 /* no matter what happens, tx->skb moves to tx->skbs */ 941 __skb_queue_tail(&tx->skbs, skb); 942 tx->skb = NULL; 943 944 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 945 return TX_CONTINUE; 946 947 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 948 return TX_CONTINUE; 949 950 /* 951 * Warn when submitting a fragmented A-MPDU frame and drop it. 952 * This scenario is handled in ieee80211_tx_prepare but extra 953 * caution taken here as fragmented ampdu may cause Tx stop. 954 */ 955 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 956 return TX_DROP; 957 958 hdrlen = ieee80211_hdrlen(hdr->frame_control); 959 960 /* internal error, why isn't DONTFRAG set? */ 961 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 962 return TX_DROP; 963 964 /* 965 * Now fragment the frame. This will allocate all the fragments and 966 * chain them (using skb as the first fragment) to skb->next. 967 * During transmission, we will remove the successfully transmitted 968 * fragments from this list. When the low-level driver rejects one 969 * of the fragments then we will simply pretend to accept the skb 970 * but store it away as pending. 971 */ 972 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 973 return TX_DROP; 974 975 /* update duration/seq/flags of fragments */ 976 fragnum = 0; 977 978 skb_queue_walk(&tx->skbs, skb) { 979 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 980 981 hdr = (void *)skb->data; 982 info = IEEE80211_SKB_CB(skb); 983 984 if (!skb_queue_is_last(&tx->skbs, skb)) { 985 hdr->frame_control |= morefrags; 986 /* 987 * No multi-rate retries for fragmented frames, that 988 * would completely throw off the NAV at other STAs. 989 */ 990 info->control.rates[1].idx = -1; 991 info->control.rates[2].idx = -1; 992 info->control.rates[3].idx = -1; 993 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 994 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 995 } else { 996 hdr->frame_control &= ~morefrags; 997 } 998 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 999 fragnum++; 1000 } 1001 1002 return TX_CONTINUE; 1003 } 1004 1005 static ieee80211_tx_result debug_noinline 1006 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1007 { 1008 struct sk_buff *skb; 1009 int ac = -1; 1010 1011 if (!tx->sta) 1012 return TX_CONTINUE; 1013 1014 skb_queue_walk(&tx->skbs, skb) { 1015 ac = skb_get_queue_mapping(skb); 1016 tx->sta->tx_stats.bytes[ac] += skb->len; 1017 } 1018 if (ac >= 0) 1019 tx->sta->tx_stats.packets[ac]++; 1020 1021 return TX_CONTINUE; 1022 } 1023 1024 static ieee80211_tx_result debug_noinline 1025 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1026 { 1027 if (!tx->key) 1028 return TX_CONTINUE; 1029 1030 switch (tx->key->conf.cipher) { 1031 case WLAN_CIPHER_SUITE_WEP40: 1032 case WLAN_CIPHER_SUITE_WEP104: 1033 return ieee80211_crypto_wep_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_TKIP: 1035 return ieee80211_crypto_tkip_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_CCMP: 1037 return ieee80211_crypto_ccmp_encrypt( 1038 tx, IEEE80211_CCMP_MIC_LEN); 1039 case WLAN_CIPHER_SUITE_CCMP_256: 1040 return ieee80211_crypto_ccmp_encrypt( 1041 tx, IEEE80211_CCMP_256_MIC_LEN); 1042 case WLAN_CIPHER_SUITE_AES_CMAC: 1043 return ieee80211_crypto_aes_cmac_encrypt(tx); 1044 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1045 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1046 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1047 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1048 return ieee80211_crypto_aes_gmac_encrypt(tx); 1049 case WLAN_CIPHER_SUITE_GCMP: 1050 case WLAN_CIPHER_SUITE_GCMP_256: 1051 return ieee80211_crypto_gcmp_encrypt(tx); 1052 default: 1053 return ieee80211_crypto_hw_encrypt(tx); 1054 } 1055 1056 return TX_DROP; 1057 } 1058 1059 static ieee80211_tx_result debug_noinline 1060 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1061 { 1062 struct sk_buff *skb; 1063 struct ieee80211_hdr *hdr; 1064 int next_len; 1065 bool group_addr; 1066 1067 skb_queue_walk(&tx->skbs, skb) { 1068 hdr = (void *) skb->data; 1069 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1070 break; /* must not overwrite AID */ 1071 if (!skb_queue_is_last(&tx->skbs, skb)) { 1072 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1073 next_len = next->len; 1074 } else 1075 next_len = 0; 1076 group_addr = is_multicast_ether_addr(hdr->addr1); 1077 1078 hdr->duration_id = 1079 ieee80211_duration(tx, skb, group_addr, next_len); 1080 } 1081 1082 return TX_CONTINUE; 1083 } 1084 1085 /* actual transmit path */ 1086 1087 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1088 struct sk_buff *skb, 1089 struct ieee80211_tx_info *info, 1090 struct tid_ampdu_tx *tid_tx, 1091 int tid) 1092 { 1093 bool queued = false; 1094 bool reset_agg_timer = false; 1095 struct sk_buff *purge_skb = NULL; 1096 1097 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1098 info->flags |= IEEE80211_TX_CTL_AMPDU; 1099 reset_agg_timer = true; 1100 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1101 /* 1102 * nothing -- this aggregation session is being started 1103 * but that might still fail with the driver 1104 */ 1105 } else if (!tx->sta->sta.txq[tid]) { 1106 spin_lock(&tx->sta->lock); 1107 /* 1108 * Need to re-check now, because we may get here 1109 * 1110 * 1) in the window during which the setup is actually 1111 * already done, but not marked yet because not all 1112 * packets are spliced over to the driver pending 1113 * queue yet -- if this happened we acquire the lock 1114 * either before or after the splice happens, but 1115 * need to recheck which of these cases happened. 1116 * 1117 * 2) during session teardown, if the OPERATIONAL bit 1118 * was cleared due to the teardown but the pointer 1119 * hasn't been assigned NULL yet (or we loaded it 1120 * before it was assigned) -- in this case it may 1121 * now be NULL which means we should just let the 1122 * packet pass through because splicing the frames 1123 * back is already done. 1124 */ 1125 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1126 1127 if (!tid_tx) { 1128 /* do nothing, let packet pass through */ 1129 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1130 info->flags |= IEEE80211_TX_CTL_AMPDU; 1131 reset_agg_timer = true; 1132 } else { 1133 queued = true; 1134 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1135 clear_sta_flag(tx->sta, WLAN_STA_SP); 1136 ps_dbg(tx->sta->sdata, 1137 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1138 tx->sta->sta.addr, tx->sta->sta.aid); 1139 } 1140 info->control.vif = &tx->sdata->vif; 1141 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1142 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1143 __skb_queue_tail(&tid_tx->pending, skb); 1144 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1145 purge_skb = __skb_dequeue(&tid_tx->pending); 1146 } 1147 spin_unlock(&tx->sta->lock); 1148 1149 if (purge_skb) 1150 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1151 } 1152 1153 /* reset session timer */ 1154 if (reset_agg_timer) 1155 tid_tx->last_tx = jiffies; 1156 1157 return queued; 1158 } 1159 1160 /* 1161 * initialises @tx 1162 * pass %NULL for the station if unknown, a valid pointer if known 1163 * or an ERR_PTR() if the station is known not to exist 1164 */ 1165 static ieee80211_tx_result 1166 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1167 struct ieee80211_tx_data *tx, 1168 struct sta_info *sta, struct sk_buff *skb) 1169 { 1170 struct ieee80211_local *local = sdata->local; 1171 struct ieee80211_hdr *hdr; 1172 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1173 int tid; 1174 1175 memset(tx, 0, sizeof(*tx)); 1176 tx->skb = skb; 1177 tx->local = local; 1178 tx->sdata = sdata; 1179 __skb_queue_head_init(&tx->skbs); 1180 1181 /* 1182 * If this flag is set to true anywhere, and we get here, 1183 * we are doing the needed processing, so remove the flag 1184 * now. 1185 */ 1186 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1187 1188 hdr = (struct ieee80211_hdr *) skb->data; 1189 1190 if (likely(sta)) { 1191 if (!IS_ERR(sta)) 1192 tx->sta = sta; 1193 } else { 1194 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1195 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1196 if (!tx->sta && sdata->wdev.use_4addr) 1197 return TX_DROP; 1198 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1199 IEEE80211_TX_CTL_INJECTED) || 1200 tx->sdata->control_port_protocol == tx->skb->protocol) { 1201 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1202 } 1203 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1204 tx->sta = sta_info_get(sdata, hdr->addr1); 1205 } 1206 1207 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1208 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1209 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1210 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1211 struct tid_ampdu_tx *tid_tx; 1212 1213 tid = ieee80211_get_tid(hdr); 1214 1215 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1216 if (tid_tx) { 1217 bool queued; 1218 1219 queued = ieee80211_tx_prep_agg(tx, skb, info, 1220 tid_tx, tid); 1221 1222 if (unlikely(queued)) 1223 return TX_QUEUED; 1224 } 1225 } 1226 1227 if (is_multicast_ether_addr(hdr->addr1)) { 1228 tx->flags &= ~IEEE80211_TX_UNICAST; 1229 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1230 } else 1231 tx->flags |= IEEE80211_TX_UNICAST; 1232 1233 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1234 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1235 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1236 info->flags & IEEE80211_TX_CTL_AMPDU) 1237 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1238 } 1239 1240 if (!tx->sta) 1241 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1242 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1243 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1244 ieee80211_check_fast_xmit(tx->sta); 1245 } 1246 1247 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1248 1249 return TX_CONTINUE; 1250 } 1251 1252 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1253 struct ieee80211_vif *vif, 1254 struct sta_info *sta, 1255 struct sk_buff *skb) 1256 { 1257 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1259 struct ieee80211_txq *txq = NULL; 1260 1261 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1262 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1263 return NULL; 1264 1265 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1266 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1267 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1268 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1269 vif->type == NL80211_IFTYPE_STATION) && 1270 sta && sta->uploaded) { 1271 /* 1272 * This will be NULL if the driver didn't set the 1273 * opt-in hardware flag. 1274 */ 1275 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1276 } 1277 } else if (sta) { 1278 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1279 1280 if (!sta->uploaded) 1281 return NULL; 1282 1283 txq = sta->sta.txq[tid]; 1284 } else if (vif) { 1285 txq = vif->txq; 1286 } 1287 1288 if (!txq) 1289 return NULL; 1290 1291 return to_txq_info(txq); 1292 } 1293 1294 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1295 { 1296 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1297 } 1298 1299 static u32 codel_skb_len_func(const struct sk_buff *skb) 1300 { 1301 return skb->len; 1302 } 1303 1304 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1305 { 1306 const struct ieee80211_tx_info *info; 1307 1308 info = (const struct ieee80211_tx_info *)skb->cb; 1309 return info->control.enqueue_time; 1310 } 1311 1312 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1313 void *ctx) 1314 { 1315 struct ieee80211_local *local; 1316 struct txq_info *txqi; 1317 struct fq *fq; 1318 struct fq_flow *flow; 1319 1320 txqi = ctx; 1321 local = vif_to_sdata(txqi->txq.vif)->local; 1322 fq = &local->fq; 1323 1324 if (cvars == &txqi->def_cvars) 1325 flow = &txqi->def_flow; 1326 else 1327 flow = &fq->flows[cvars - local->cvars]; 1328 1329 return fq_flow_dequeue(fq, flow); 1330 } 1331 1332 static void codel_drop_func(struct sk_buff *skb, 1333 void *ctx) 1334 { 1335 struct ieee80211_local *local; 1336 struct ieee80211_hw *hw; 1337 struct txq_info *txqi; 1338 1339 txqi = ctx; 1340 local = vif_to_sdata(txqi->txq.vif)->local; 1341 hw = &local->hw; 1342 1343 ieee80211_free_txskb(hw, skb); 1344 } 1345 1346 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1347 struct fq_tin *tin, 1348 struct fq_flow *flow) 1349 { 1350 struct ieee80211_local *local; 1351 struct txq_info *txqi; 1352 struct codel_vars *cvars; 1353 struct codel_params *cparams; 1354 struct codel_stats *cstats; 1355 1356 local = container_of(fq, struct ieee80211_local, fq); 1357 txqi = container_of(tin, struct txq_info, tin); 1358 cstats = &txqi->cstats; 1359 1360 if (txqi->txq.sta) { 1361 struct sta_info *sta = container_of(txqi->txq.sta, 1362 struct sta_info, sta); 1363 cparams = &sta->cparams; 1364 } else { 1365 cparams = &local->cparams; 1366 } 1367 1368 if (flow == &txqi->def_flow) 1369 cvars = &txqi->def_cvars; 1370 else 1371 cvars = &local->cvars[flow - fq->flows]; 1372 1373 return codel_dequeue(txqi, 1374 &flow->backlog, 1375 cparams, 1376 cvars, 1377 cstats, 1378 codel_skb_len_func, 1379 codel_skb_time_func, 1380 codel_drop_func, 1381 codel_dequeue_func); 1382 } 1383 1384 static void fq_skb_free_func(struct fq *fq, 1385 struct fq_tin *tin, 1386 struct fq_flow *flow, 1387 struct sk_buff *skb) 1388 { 1389 struct ieee80211_local *local; 1390 1391 local = container_of(fq, struct ieee80211_local, fq); 1392 ieee80211_free_txskb(&local->hw, skb); 1393 } 1394 1395 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1396 struct fq_tin *tin, 1397 int idx, 1398 struct sk_buff *skb) 1399 { 1400 struct txq_info *txqi; 1401 1402 txqi = container_of(tin, struct txq_info, tin); 1403 return &txqi->def_flow; 1404 } 1405 1406 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1407 struct txq_info *txqi, 1408 struct sk_buff *skb) 1409 { 1410 struct fq *fq = &local->fq; 1411 struct fq_tin *tin = &txqi->tin; 1412 u32 flow_idx = fq_flow_idx(fq, skb); 1413 1414 ieee80211_set_skb_enqueue_time(skb); 1415 1416 spin_lock_bh(&fq->lock); 1417 fq_tin_enqueue(fq, tin, flow_idx, skb, 1418 fq_skb_free_func, 1419 fq_flow_get_default_func); 1420 spin_unlock_bh(&fq->lock); 1421 } 1422 1423 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1424 struct fq_flow *flow, struct sk_buff *skb, 1425 void *data) 1426 { 1427 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1428 1429 return info->control.vif == data; 1430 } 1431 1432 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1433 struct ieee80211_sub_if_data *sdata) 1434 { 1435 struct fq *fq = &local->fq; 1436 struct txq_info *txqi; 1437 struct fq_tin *tin; 1438 struct ieee80211_sub_if_data *ap; 1439 1440 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1441 return; 1442 1443 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1444 1445 if (!ap->vif.txq) 1446 return; 1447 1448 txqi = to_txq_info(ap->vif.txq); 1449 tin = &txqi->tin; 1450 1451 spin_lock_bh(&fq->lock); 1452 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1453 fq_skb_free_func); 1454 spin_unlock_bh(&fq->lock); 1455 } 1456 1457 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1458 struct sta_info *sta, 1459 struct txq_info *txqi, int tid) 1460 { 1461 fq_tin_init(&txqi->tin); 1462 fq_flow_init(&txqi->def_flow); 1463 codel_vars_init(&txqi->def_cvars); 1464 codel_stats_init(&txqi->cstats); 1465 __skb_queue_head_init(&txqi->frags); 1466 INIT_LIST_HEAD(&txqi->schedule_order); 1467 1468 txqi->txq.vif = &sdata->vif; 1469 1470 if (!sta) { 1471 sdata->vif.txq = &txqi->txq; 1472 txqi->txq.tid = 0; 1473 txqi->txq.ac = IEEE80211_AC_BE; 1474 1475 return; 1476 } 1477 1478 if (tid == IEEE80211_NUM_TIDS) { 1479 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1480 /* Drivers need to opt in to the management MPDU TXQ */ 1481 if (!ieee80211_hw_check(&sdata->local->hw, 1482 STA_MMPDU_TXQ)) 1483 return; 1484 } else if (!ieee80211_hw_check(&sdata->local->hw, 1485 BUFF_MMPDU_TXQ)) { 1486 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1487 return; 1488 } 1489 txqi->txq.ac = IEEE80211_AC_VO; 1490 } else { 1491 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1492 } 1493 1494 txqi->txq.sta = &sta->sta; 1495 txqi->txq.tid = tid; 1496 sta->sta.txq[tid] = &txqi->txq; 1497 } 1498 1499 void ieee80211_txq_purge(struct ieee80211_local *local, 1500 struct txq_info *txqi) 1501 { 1502 struct fq *fq = &local->fq; 1503 struct fq_tin *tin = &txqi->tin; 1504 1505 spin_lock_bh(&fq->lock); 1506 fq_tin_reset(fq, tin, fq_skb_free_func); 1507 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1508 spin_unlock_bh(&fq->lock); 1509 1510 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1511 list_del_init(&txqi->schedule_order); 1512 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1513 } 1514 1515 void ieee80211_txq_set_params(struct ieee80211_local *local) 1516 { 1517 if (local->hw.wiphy->txq_limit) 1518 local->fq.limit = local->hw.wiphy->txq_limit; 1519 else 1520 local->hw.wiphy->txq_limit = local->fq.limit; 1521 1522 if (local->hw.wiphy->txq_memory_limit) 1523 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1524 else 1525 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1526 1527 if (local->hw.wiphy->txq_quantum) 1528 local->fq.quantum = local->hw.wiphy->txq_quantum; 1529 else 1530 local->hw.wiphy->txq_quantum = local->fq.quantum; 1531 } 1532 1533 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1534 { 1535 struct fq *fq = &local->fq; 1536 int ret; 1537 int i; 1538 bool supp_vht = false; 1539 enum nl80211_band band; 1540 1541 if (!local->ops->wake_tx_queue) 1542 return 0; 1543 1544 ret = fq_init(fq, 4096); 1545 if (ret) 1546 return ret; 1547 1548 /* 1549 * If the hardware doesn't support VHT, it is safe to limit the maximum 1550 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1551 */ 1552 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1553 struct ieee80211_supported_band *sband; 1554 1555 sband = local->hw.wiphy->bands[band]; 1556 if (!sband) 1557 continue; 1558 1559 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1560 } 1561 1562 if (!supp_vht) 1563 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1564 1565 codel_params_init(&local->cparams); 1566 local->cparams.interval = MS2TIME(100); 1567 local->cparams.target = MS2TIME(20); 1568 local->cparams.ecn = true; 1569 1570 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1571 GFP_KERNEL); 1572 if (!local->cvars) { 1573 spin_lock_bh(&fq->lock); 1574 fq_reset(fq, fq_skb_free_func); 1575 spin_unlock_bh(&fq->lock); 1576 return -ENOMEM; 1577 } 1578 1579 for (i = 0; i < fq->flows_cnt; i++) 1580 codel_vars_init(&local->cvars[i]); 1581 1582 ieee80211_txq_set_params(local); 1583 1584 return 0; 1585 } 1586 1587 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1588 { 1589 struct fq *fq = &local->fq; 1590 1591 if (!local->ops->wake_tx_queue) 1592 return; 1593 1594 kfree(local->cvars); 1595 local->cvars = NULL; 1596 1597 spin_lock_bh(&fq->lock); 1598 fq_reset(fq, fq_skb_free_func); 1599 spin_unlock_bh(&fq->lock); 1600 } 1601 1602 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1603 struct ieee80211_sub_if_data *sdata, 1604 struct sta_info *sta, 1605 struct sk_buff *skb) 1606 { 1607 struct ieee80211_vif *vif; 1608 struct txq_info *txqi; 1609 1610 if (!local->ops->wake_tx_queue || 1611 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1612 return false; 1613 1614 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1615 sdata = container_of(sdata->bss, 1616 struct ieee80211_sub_if_data, u.ap); 1617 1618 vif = &sdata->vif; 1619 txqi = ieee80211_get_txq(local, vif, sta, skb); 1620 1621 if (!txqi) 1622 return false; 1623 1624 ieee80211_txq_enqueue(local, txqi, skb); 1625 1626 schedule_and_wake_txq(local, txqi); 1627 1628 return true; 1629 } 1630 1631 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1632 struct ieee80211_vif *vif, 1633 struct sta_info *sta, 1634 struct sk_buff_head *skbs, 1635 bool txpending) 1636 { 1637 struct ieee80211_tx_control control = {}; 1638 struct sk_buff *skb, *tmp; 1639 unsigned long flags; 1640 1641 skb_queue_walk_safe(skbs, skb, tmp) { 1642 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1643 int q = info->hw_queue; 1644 1645 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1646 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1647 __skb_unlink(skb, skbs); 1648 ieee80211_free_txskb(&local->hw, skb); 1649 continue; 1650 } 1651 #endif 1652 1653 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1654 if (local->queue_stop_reasons[q] || 1655 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1656 if (unlikely(info->flags & 1657 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1658 if (local->queue_stop_reasons[q] & 1659 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1660 /* 1661 * Drop off-channel frames if queues 1662 * are stopped for any reason other 1663 * than off-channel operation. Never 1664 * queue them. 1665 */ 1666 spin_unlock_irqrestore( 1667 &local->queue_stop_reason_lock, 1668 flags); 1669 ieee80211_purge_tx_queue(&local->hw, 1670 skbs); 1671 return true; 1672 } 1673 } else { 1674 1675 /* 1676 * Since queue is stopped, queue up frames for 1677 * later transmission from the tx-pending 1678 * tasklet when the queue is woken again. 1679 */ 1680 if (txpending) 1681 skb_queue_splice_init(skbs, 1682 &local->pending[q]); 1683 else 1684 skb_queue_splice_tail_init(skbs, 1685 &local->pending[q]); 1686 1687 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1688 flags); 1689 return false; 1690 } 1691 } 1692 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1693 1694 info->control.vif = vif; 1695 control.sta = sta ? &sta->sta : NULL; 1696 1697 __skb_unlink(skb, skbs); 1698 drv_tx(local, &control, skb); 1699 } 1700 1701 return true; 1702 } 1703 1704 /* 1705 * Returns false if the frame couldn't be transmitted but was queued instead. 1706 */ 1707 static bool __ieee80211_tx(struct ieee80211_local *local, 1708 struct sk_buff_head *skbs, int led_len, 1709 struct sta_info *sta, bool txpending) 1710 { 1711 struct ieee80211_tx_info *info; 1712 struct ieee80211_sub_if_data *sdata; 1713 struct ieee80211_vif *vif; 1714 struct sk_buff *skb; 1715 bool result = true; 1716 __le16 fc; 1717 1718 if (WARN_ON(skb_queue_empty(skbs))) 1719 return true; 1720 1721 skb = skb_peek(skbs); 1722 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1723 info = IEEE80211_SKB_CB(skb); 1724 sdata = vif_to_sdata(info->control.vif); 1725 if (sta && !sta->uploaded) 1726 sta = NULL; 1727 1728 switch (sdata->vif.type) { 1729 case NL80211_IFTYPE_MONITOR: 1730 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1731 vif = &sdata->vif; 1732 break; 1733 } 1734 sdata = rcu_dereference(local->monitor_sdata); 1735 if (sdata) { 1736 vif = &sdata->vif; 1737 info->hw_queue = 1738 vif->hw_queue[skb_get_queue_mapping(skb)]; 1739 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1740 ieee80211_purge_tx_queue(&local->hw, skbs); 1741 return true; 1742 } else 1743 vif = NULL; 1744 break; 1745 case NL80211_IFTYPE_AP_VLAN: 1746 sdata = container_of(sdata->bss, 1747 struct ieee80211_sub_if_data, u.ap); 1748 fallthrough; 1749 default: 1750 vif = &sdata->vif; 1751 break; 1752 } 1753 1754 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1755 1756 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1757 1758 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1759 1760 return result; 1761 } 1762 1763 /* 1764 * Invoke TX handlers, return 0 on success and non-zero if the 1765 * frame was dropped or queued. 1766 * 1767 * The handlers are split into an early and late part. The latter is everything 1768 * that can be sensitive to reordering, and will be deferred to after packets 1769 * are dequeued from the intermediate queues (when they are enabled). 1770 */ 1771 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1772 { 1773 ieee80211_tx_result res = TX_DROP; 1774 1775 #define CALL_TXH(txh) \ 1776 do { \ 1777 res = txh(tx); \ 1778 if (res != TX_CONTINUE) \ 1779 goto txh_done; \ 1780 } while (0) 1781 1782 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1783 CALL_TXH(ieee80211_tx_h_check_assoc); 1784 CALL_TXH(ieee80211_tx_h_ps_buf); 1785 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1786 CALL_TXH(ieee80211_tx_h_select_key); 1787 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1788 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1789 1790 txh_done: 1791 if (unlikely(res == TX_DROP)) { 1792 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1793 if (tx->skb) 1794 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1795 else 1796 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1797 return -1; 1798 } else if (unlikely(res == TX_QUEUED)) { 1799 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1800 return -1; 1801 } 1802 1803 return 0; 1804 } 1805 1806 /* 1807 * Late handlers can be called while the sta lock is held. Handlers that can 1808 * cause packets to be generated will cause deadlock! 1809 */ 1810 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1811 { 1812 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1813 ieee80211_tx_result res = TX_CONTINUE; 1814 1815 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1816 __skb_queue_tail(&tx->skbs, tx->skb); 1817 tx->skb = NULL; 1818 goto txh_done; 1819 } 1820 1821 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1822 CALL_TXH(ieee80211_tx_h_sequence); 1823 CALL_TXH(ieee80211_tx_h_fragment); 1824 /* handlers after fragment must be aware of tx info fragmentation! */ 1825 CALL_TXH(ieee80211_tx_h_stats); 1826 CALL_TXH(ieee80211_tx_h_encrypt); 1827 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1828 CALL_TXH(ieee80211_tx_h_calculate_duration); 1829 #undef CALL_TXH 1830 1831 txh_done: 1832 if (unlikely(res == TX_DROP)) { 1833 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1834 if (tx->skb) 1835 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1836 else 1837 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1838 return -1; 1839 } else if (unlikely(res == TX_QUEUED)) { 1840 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1841 return -1; 1842 } 1843 1844 return 0; 1845 } 1846 1847 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1848 { 1849 int r = invoke_tx_handlers_early(tx); 1850 1851 if (r) 1852 return r; 1853 return invoke_tx_handlers_late(tx); 1854 } 1855 1856 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1857 struct ieee80211_vif *vif, struct sk_buff *skb, 1858 int band, struct ieee80211_sta **sta) 1859 { 1860 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1861 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1862 struct ieee80211_tx_data tx; 1863 struct sk_buff *skb2; 1864 1865 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1866 return false; 1867 1868 info->band = band; 1869 info->control.vif = vif; 1870 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1871 1872 if (invoke_tx_handlers(&tx)) 1873 return false; 1874 1875 if (sta) { 1876 if (tx.sta) 1877 *sta = &tx.sta->sta; 1878 else 1879 *sta = NULL; 1880 } 1881 1882 /* this function isn't suitable for fragmented data frames */ 1883 skb2 = __skb_dequeue(&tx.skbs); 1884 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1885 ieee80211_free_txskb(hw, skb2); 1886 ieee80211_purge_tx_queue(hw, &tx.skbs); 1887 return false; 1888 } 1889 1890 return true; 1891 } 1892 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1893 1894 /* 1895 * Returns false if the frame couldn't be transmitted but was queued instead. 1896 */ 1897 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1898 struct sta_info *sta, struct sk_buff *skb, 1899 bool txpending) 1900 { 1901 struct ieee80211_local *local = sdata->local; 1902 struct ieee80211_tx_data tx; 1903 ieee80211_tx_result res_prepare; 1904 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1905 bool result = true; 1906 int led_len; 1907 1908 if (unlikely(skb->len < 10)) { 1909 dev_kfree_skb(skb); 1910 return true; 1911 } 1912 1913 /* initialises tx */ 1914 led_len = skb->len; 1915 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1916 1917 if (unlikely(res_prepare == TX_DROP)) { 1918 ieee80211_free_txskb(&local->hw, skb); 1919 return true; 1920 } else if (unlikely(res_prepare == TX_QUEUED)) { 1921 return true; 1922 } 1923 1924 /* set up hw_queue value early */ 1925 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1926 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1927 info->hw_queue = 1928 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1929 1930 if (invoke_tx_handlers_early(&tx)) 1931 return true; 1932 1933 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1934 return true; 1935 1936 if (!invoke_tx_handlers_late(&tx)) 1937 result = __ieee80211_tx(local, &tx.skbs, led_len, 1938 tx.sta, txpending); 1939 1940 return result; 1941 } 1942 1943 /* device xmit handlers */ 1944 1945 enum ieee80211_encrypt { 1946 ENCRYPT_NO, 1947 ENCRYPT_MGMT, 1948 ENCRYPT_DATA, 1949 }; 1950 1951 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1952 struct sk_buff *skb, 1953 int head_need, 1954 enum ieee80211_encrypt encrypt) 1955 { 1956 struct ieee80211_local *local = sdata->local; 1957 bool enc_tailroom; 1958 int tail_need = 0; 1959 1960 enc_tailroom = encrypt == ENCRYPT_MGMT || 1961 (encrypt == ENCRYPT_DATA && 1962 sdata->crypto_tx_tailroom_needed_cnt); 1963 1964 if (enc_tailroom) { 1965 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1966 tail_need -= skb_tailroom(skb); 1967 tail_need = max_t(int, tail_need, 0); 1968 } 1969 1970 if (skb_cloned(skb) && 1971 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1972 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1973 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1974 else if (head_need || tail_need) 1975 I802_DEBUG_INC(local->tx_expand_skb_head); 1976 else 1977 return 0; 1978 1979 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1980 wiphy_debug(local->hw.wiphy, 1981 "failed to reallocate TX buffer\n"); 1982 return -ENOMEM; 1983 } 1984 1985 return 0; 1986 } 1987 1988 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1989 struct sta_info *sta, struct sk_buff *skb) 1990 { 1991 struct ieee80211_local *local = sdata->local; 1992 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1993 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1994 int headroom; 1995 enum ieee80211_encrypt encrypt; 1996 1997 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 1998 encrypt = ENCRYPT_NO; 1999 else if (ieee80211_is_mgmt(hdr->frame_control)) 2000 encrypt = ENCRYPT_MGMT; 2001 else 2002 encrypt = ENCRYPT_DATA; 2003 2004 headroom = local->tx_headroom; 2005 if (encrypt != ENCRYPT_NO) 2006 headroom += sdata->encrypt_headroom; 2007 headroom -= skb_headroom(skb); 2008 headroom = max_t(int, 0, headroom); 2009 2010 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2011 ieee80211_free_txskb(&local->hw, skb); 2012 return; 2013 } 2014 2015 /* reload after potential resize */ 2016 hdr = (struct ieee80211_hdr *) skb->data; 2017 info->control.vif = &sdata->vif; 2018 2019 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2020 if (ieee80211_is_data(hdr->frame_control) && 2021 is_unicast_ether_addr(hdr->addr1)) { 2022 if (mesh_nexthop_resolve(sdata, skb)) 2023 return; /* skb queued: don't free */ 2024 } else { 2025 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2026 } 2027 } 2028 2029 ieee80211_set_qos_hdr(sdata, skb); 2030 ieee80211_tx(sdata, sta, skb, false); 2031 } 2032 2033 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2034 struct net_device *dev) 2035 { 2036 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2037 struct ieee80211_radiotap_iterator iterator; 2038 struct ieee80211_radiotap_header *rthdr = 2039 (struct ieee80211_radiotap_header *) skb->data; 2040 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2041 struct ieee80211_supported_band *sband = 2042 local->hw.wiphy->bands[info->band]; 2043 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2044 NULL); 2045 u16 txflags; 2046 u16 rate = 0; 2047 bool rate_found = false; 2048 u8 rate_retries = 0; 2049 u16 rate_flags = 0; 2050 u8 mcs_known, mcs_flags, mcs_bw; 2051 u16 vht_known; 2052 u8 vht_mcs = 0, vht_nss = 0; 2053 int i; 2054 2055 /* check for not even having the fixed radiotap header part */ 2056 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2057 return false; /* too short to be possibly valid */ 2058 2059 /* is it a header version we can trust to find length from? */ 2060 if (unlikely(rthdr->it_version)) 2061 return false; /* only version 0 is supported */ 2062 2063 /* does the skb contain enough to deliver on the alleged length? */ 2064 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2065 return false; /* skb too short for claimed rt header extent */ 2066 2067 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2068 IEEE80211_TX_CTL_DONTFRAG; 2069 2070 /* 2071 * for every radiotap entry that is present 2072 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2073 * entries present, or -EINVAL on error) 2074 */ 2075 2076 while (!ret) { 2077 ret = ieee80211_radiotap_iterator_next(&iterator); 2078 2079 if (ret) 2080 continue; 2081 2082 /* see if this argument is something we can use */ 2083 switch (iterator.this_arg_index) { 2084 /* 2085 * You must take care when dereferencing iterator.this_arg 2086 * for multibyte types... the pointer is not aligned. Use 2087 * get_unaligned((type *)iterator.this_arg) to dereference 2088 * iterator.this_arg for type "type" safely on all arches. 2089 */ 2090 case IEEE80211_RADIOTAP_FLAGS: 2091 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2092 /* 2093 * this indicates that the skb we have been 2094 * handed has the 32-bit FCS CRC at the end... 2095 * we should react to that by snipping it off 2096 * because it will be recomputed and added 2097 * on transmission 2098 */ 2099 if (skb->len < (iterator._max_length + FCS_LEN)) 2100 return false; 2101 2102 skb_trim(skb, skb->len - FCS_LEN); 2103 } 2104 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2105 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2106 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2107 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2108 break; 2109 2110 case IEEE80211_RADIOTAP_TX_FLAGS: 2111 txflags = get_unaligned_le16(iterator.this_arg); 2112 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2113 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2114 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2115 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2116 break; 2117 2118 case IEEE80211_RADIOTAP_RATE: 2119 rate = *iterator.this_arg; 2120 rate_flags = 0; 2121 rate_found = true; 2122 break; 2123 2124 case IEEE80211_RADIOTAP_DATA_RETRIES: 2125 rate_retries = *iterator.this_arg; 2126 break; 2127 2128 case IEEE80211_RADIOTAP_MCS: 2129 mcs_known = iterator.this_arg[0]; 2130 mcs_flags = iterator.this_arg[1]; 2131 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2132 break; 2133 2134 rate_found = true; 2135 rate = iterator.this_arg[2]; 2136 rate_flags = IEEE80211_TX_RC_MCS; 2137 2138 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2139 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2140 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2141 2142 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2143 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2144 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2145 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2146 break; 2147 2148 case IEEE80211_RADIOTAP_VHT: 2149 vht_known = get_unaligned_le16(iterator.this_arg); 2150 rate_found = true; 2151 2152 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2153 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2154 (iterator.this_arg[2] & 2155 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2156 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2157 if (vht_known & 2158 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2159 if (iterator.this_arg[3] == 1) 2160 rate_flags |= 2161 IEEE80211_TX_RC_40_MHZ_WIDTH; 2162 else if (iterator.this_arg[3] == 4) 2163 rate_flags |= 2164 IEEE80211_TX_RC_80_MHZ_WIDTH; 2165 else if (iterator.this_arg[3] == 11) 2166 rate_flags |= 2167 IEEE80211_TX_RC_160_MHZ_WIDTH; 2168 } 2169 2170 vht_mcs = iterator.this_arg[4] >> 4; 2171 vht_nss = iterator.this_arg[4] & 0xF; 2172 break; 2173 2174 /* 2175 * Please update the file 2176 * Documentation/networking/mac80211-injection.rst 2177 * when parsing new fields here. 2178 */ 2179 2180 default: 2181 break; 2182 } 2183 } 2184 2185 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2186 return false; 2187 2188 if (rate_found) { 2189 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2190 2191 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2192 info->control.rates[i].idx = -1; 2193 info->control.rates[i].flags = 0; 2194 info->control.rates[i].count = 0; 2195 } 2196 2197 if (rate_flags & IEEE80211_TX_RC_MCS) { 2198 info->control.rates[0].idx = rate; 2199 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2200 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2201 vht_nss); 2202 } else { 2203 for (i = 0; i < sband->n_bitrates; i++) { 2204 if (rate * 5 != sband->bitrates[i].bitrate) 2205 continue; 2206 2207 info->control.rates[0].idx = i; 2208 break; 2209 } 2210 } 2211 2212 if (info->control.rates[0].idx < 0) 2213 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2214 2215 info->control.rates[0].flags = rate_flags; 2216 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2217 local->hw.max_rate_tries); 2218 } 2219 2220 return true; 2221 } 2222 2223 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2224 struct net_device *dev) 2225 { 2226 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2227 struct ieee80211_chanctx_conf *chanctx_conf; 2228 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2229 struct ieee80211_hdr *hdr; 2230 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2231 struct cfg80211_chan_def *chandef; 2232 u16 len_rthdr; 2233 int hdrlen; 2234 2235 memset(info, 0, sizeof(*info)); 2236 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2237 IEEE80211_TX_CTL_INJECTED; 2238 2239 /* Sanity-check and process the injection radiotap header */ 2240 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2241 goto fail; 2242 2243 /* we now know there is a radiotap header with a length we can use */ 2244 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2245 2246 /* 2247 * fix up the pointers accounting for the radiotap 2248 * header still being in there. We are being given 2249 * a precooked IEEE80211 header so no need for 2250 * normal processing 2251 */ 2252 skb_set_mac_header(skb, len_rthdr); 2253 /* 2254 * these are just fixed to the end of the rt area since we 2255 * don't have any better information and at this point, nobody cares 2256 */ 2257 skb_set_network_header(skb, len_rthdr); 2258 skb_set_transport_header(skb, len_rthdr); 2259 2260 if (skb->len < len_rthdr + 2) 2261 goto fail; 2262 2263 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2264 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2265 2266 if (skb->len < len_rthdr + hdrlen) 2267 goto fail; 2268 2269 /* 2270 * Initialize skb->protocol if the injected frame is a data frame 2271 * carrying a rfc1042 header 2272 */ 2273 if (ieee80211_is_data(hdr->frame_control) && 2274 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2275 u8 *payload = (u8 *)hdr + hdrlen; 2276 2277 if (ether_addr_equal(payload, rfc1042_header)) 2278 skb->protocol = cpu_to_be16((payload[6] << 8) | 2279 payload[7]); 2280 } 2281 2282 /* 2283 * Initialize skb->priority for QoS frames. This is put in the TID field 2284 * of the frame before passing it to the driver. 2285 */ 2286 if (ieee80211_is_data_qos(hdr->frame_control)) { 2287 u8 *p = ieee80211_get_qos_ctl(hdr); 2288 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 2289 } 2290 2291 rcu_read_lock(); 2292 2293 /* 2294 * We process outgoing injected frames that have a local address 2295 * we handle as though they are non-injected frames. 2296 * This code here isn't entirely correct, the local MAC address 2297 * isn't always enough to find the interface to use; for proper 2298 * VLAN/WDS support we will need a different mechanism (which 2299 * likely isn't going to be monitor interfaces). 2300 * 2301 * This is necessary, for example, for old hostapd versions that 2302 * don't use nl80211-based management TX/RX. 2303 */ 2304 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2305 2306 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2307 if (!ieee80211_sdata_running(tmp_sdata)) 2308 continue; 2309 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2310 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2311 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2312 continue; 2313 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2314 sdata = tmp_sdata; 2315 break; 2316 } 2317 } 2318 2319 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2320 if (!chanctx_conf) { 2321 tmp_sdata = rcu_dereference(local->monitor_sdata); 2322 if (tmp_sdata) 2323 chanctx_conf = 2324 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2325 } 2326 2327 if (chanctx_conf) 2328 chandef = &chanctx_conf->def; 2329 else if (!local->use_chanctx) 2330 chandef = &local->_oper_chandef; 2331 else 2332 goto fail_rcu; 2333 2334 /* 2335 * Frame injection is not allowed if beaconing is not allowed 2336 * or if we need radar detection. Beaconing is usually not allowed when 2337 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2338 * Passive scan is also used in world regulatory domains where 2339 * your country is not known and as such it should be treated as 2340 * NO TX unless the channel is explicitly allowed in which case 2341 * your current regulatory domain would not have the passive scan 2342 * flag. 2343 * 2344 * Since AP mode uses monitor interfaces to inject/TX management 2345 * frames we can make AP mode the exception to this rule once it 2346 * supports radar detection as its implementation can deal with 2347 * radar detection by itself. We can do that later by adding a 2348 * monitor flag interfaces used for AP support. 2349 */ 2350 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2351 sdata->vif.type)) 2352 goto fail_rcu; 2353 2354 info->band = chandef->chan->band; 2355 2356 /* remove the injection radiotap header */ 2357 skb_pull(skb, len_rthdr); 2358 2359 ieee80211_xmit(sdata, NULL, skb); 2360 rcu_read_unlock(); 2361 2362 return NETDEV_TX_OK; 2363 2364 fail_rcu: 2365 rcu_read_unlock(); 2366 fail: 2367 dev_kfree_skb(skb); 2368 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2369 } 2370 2371 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2372 { 2373 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2374 2375 return ethertype == ETH_P_TDLS && 2376 skb->len > 14 && 2377 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2378 } 2379 2380 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2381 struct sk_buff *skb, 2382 struct sta_info **sta_out) 2383 { 2384 struct sta_info *sta; 2385 2386 switch (sdata->vif.type) { 2387 case NL80211_IFTYPE_AP_VLAN: 2388 sta = rcu_dereference(sdata->u.vlan.sta); 2389 if (sta) { 2390 *sta_out = sta; 2391 return 0; 2392 } else if (sdata->wdev.use_4addr) { 2393 return -ENOLINK; 2394 } 2395 fallthrough; 2396 case NL80211_IFTYPE_AP: 2397 case NL80211_IFTYPE_OCB: 2398 case NL80211_IFTYPE_ADHOC: 2399 if (is_multicast_ether_addr(skb->data)) { 2400 *sta_out = ERR_PTR(-ENOENT); 2401 return 0; 2402 } 2403 sta = sta_info_get_bss(sdata, skb->data); 2404 break; 2405 case NL80211_IFTYPE_WDS: 2406 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2407 break; 2408 #ifdef CONFIG_MAC80211_MESH 2409 case NL80211_IFTYPE_MESH_POINT: 2410 /* determined much later */ 2411 *sta_out = NULL; 2412 return 0; 2413 #endif 2414 case NL80211_IFTYPE_STATION: 2415 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2416 sta = sta_info_get(sdata, skb->data); 2417 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2418 if (test_sta_flag(sta, 2419 WLAN_STA_TDLS_PEER_AUTH)) { 2420 *sta_out = sta; 2421 return 0; 2422 } 2423 2424 /* 2425 * TDLS link during setup - throw out frames to 2426 * peer. Allow TDLS-setup frames to unauthorized 2427 * peers for the special case of a link teardown 2428 * after a TDLS sta is removed due to being 2429 * unreachable. 2430 */ 2431 if (!ieee80211_is_tdls_setup(skb)) 2432 return -EINVAL; 2433 } 2434 2435 } 2436 2437 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2438 if (!sta) 2439 return -ENOLINK; 2440 break; 2441 default: 2442 return -EINVAL; 2443 } 2444 2445 *sta_out = sta ?: ERR_PTR(-ENOENT); 2446 return 0; 2447 } 2448 2449 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2450 struct sk_buff *skb, 2451 u32 *info_flags, 2452 u64 *cookie) 2453 { 2454 struct sk_buff *ack_skb; 2455 u16 info_id = 0; 2456 2457 if (skb->sk) 2458 ack_skb = skb_clone_sk(skb); 2459 else 2460 ack_skb = skb_clone(skb, GFP_ATOMIC); 2461 2462 if (ack_skb) { 2463 unsigned long flags; 2464 int id; 2465 2466 spin_lock_irqsave(&local->ack_status_lock, flags); 2467 id = idr_alloc(&local->ack_status_frames, ack_skb, 2468 1, 0x2000, GFP_ATOMIC); 2469 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2470 2471 if (id >= 0) { 2472 info_id = id; 2473 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2474 if (cookie) { 2475 *cookie = ieee80211_mgmt_tx_cookie(local); 2476 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2477 } 2478 } else { 2479 kfree_skb(ack_skb); 2480 } 2481 } 2482 2483 return info_id; 2484 } 2485 2486 /** 2487 * ieee80211_build_hdr - build 802.11 header in the given frame 2488 * @sdata: virtual interface to build the header for 2489 * @skb: the skb to build the header in 2490 * @info_flags: skb flags to set 2491 * @sta: the station pointer 2492 * @ctrl_flags: info control flags to set 2493 * @cookie: cookie pointer to fill (if not %NULL) 2494 * 2495 * This function takes the skb with 802.3 header and reformats the header to 2496 * the appropriate IEEE 802.11 header based on which interface the packet is 2497 * being transmitted on. 2498 * 2499 * Note that this function also takes care of the TX status request and 2500 * potential unsharing of the SKB - this needs to be interleaved with the 2501 * header building. 2502 * 2503 * The function requires the read-side RCU lock held 2504 * 2505 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2506 */ 2507 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2508 struct sk_buff *skb, u32 info_flags, 2509 struct sta_info *sta, u32 ctrl_flags, 2510 u64 *cookie) 2511 { 2512 struct ieee80211_local *local = sdata->local; 2513 struct ieee80211_tx_info *info; 2514 int head_need; 2515 u16 ethertype, hdrlen, meshhdrlen = 0; 2516 __le16 fc; 2517 struct ieee80211_hdr hdr; 2518 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2519 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2520 const u8 *encaps_data; 2521 int encaps_len, skip_header_bytes; 2522 bool wme_sta = false, authorized = false; 2523 bool tdls_peer; 2524 bool multicast; 2525 u16 info_id = 0; 2526 struct ieee80211_chanctx_conf *chanctx_conf; 2527 struct ieee80211_sub_if_data *ap_sdata; 2528 enum nl80211_band band; 2529 int ret; 2530 2531 if (IS_ERR(sta)) 2532 sta = NULL; 2533 2534 #ifdef CONFIG_MAC80211_DEBUGFS 2535 if (local->force_tx_status) 2536 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2537 #endif 2538 2539 /* convert Ethernet header to proper 802.11 header (based on 2540 * operation mode) */ 2541 ethertype = (skb->data[12] << 8) | skb->data[13]; 2542 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2543 2544 switch (sdata->vif.type) { 2545 case NL80211_IFTYPE_AP_VLAN: 2546 if (sdata->wdev.use_4addr) { 2547 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2548 /* RA TA DA SA */ 2549 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2550 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2551 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2552 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2553 hdrlen = 30; 2554 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2555 wme_sta = sta->sta.wme; 2556 } 2557 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2558 u.ap); 2559 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2560 if (!chanctx_conf) { 2561 ret = -ENOTCONN; 2562 goto free; 2563 } 2564 band = chanctx_conf->def.chan->band; 2565 if (sdata->wdev.use_4addr) 2566 break; 2567 fallthrough; 2568 case NL80211_IFTYPE_AP: 2569 if (sdata->vif.type == NL80211_IFTYPE_AP) 2570 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2571 if (!chanctx_conf) { 2572 ret = -ENOTCONN; 2573 goto free; 2574 } 2575 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2576 /* DA BSSID SA */ 2577 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2578 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2579 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2580 hdrlen = 24; 2581 band = chanctx_conf->def.chan->band; 2582 break; 2583 case NL80211_IFTYPE_WDS: 2584 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2585 /* RA TA DA SA */ 2586 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2587 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2588 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2589 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2590 hdrlen = 30; 2591 /* 2592 * This is the exception! WDS style interfaces are prohibited 2593 * when channel contexts are in used so this must be valid 2594 */ 2595 band = local->hw.conf.chandef.chan->band; 2596 break; 2597 #ifdef CONFIG_MAC80211_MESH 2598 case NL80211_IFTYPE_MESH_POINT: 2599 if (!is_multicast_ether_addr(skb->data)) { 2600 struct sta_info *next_hop; 2601 bool mpp_lookup = true; 2602 2603 mpath = mesh_path_lookup(sdata, skb->data); 2604 if (mpath) { 2605 mpp_lookup = false; 2606 next_hop = rcu_dereference(mpath->next_hop); 2607 if (!next_hop || 2608 !(mpath->flags & (MESH_PATH_ACTIVE | 2609 MESH_PATH_RESOLVING))) 2610 mpp_lookup = true; 2611 } 2612 2613 if (mpp_lookup) { 2614 mppath = mpp_path_lookup(sdata, skb->data); 2615 if (mppath) 2616 mppath->exp_time = jiffies; 2617 } 2618 2619 if (mppath && mpath) 2620 mesh_path_del(sdata, mpath->dst); 2621 } 2622 2623 /* 2624 * Use address extension if it is a packet from 2625 * another interface or if we know the destination 2626 * is being proxied by a portal (i.e. portal address 2627 * differs from proxied address) 2628 */ 2629 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2630 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2631 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2632 skb->data, skb->data + ETH_ALEN); 2633 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2634 NULL, NULL); 2635 } else { 2636 /* DS -> MBSS (802.11-2012 13.11.3.3). 2637 * For unicast with unknown forwarding information, 2638 * destination might be in the MBSS or if that fails 2639 * forwarded to another mesh gate. In either case 2640 * resolution will be handled in ieee80211_xmit(), so 2641 * leave the original DA. This also works for mcast */ 2642 const u8 *mesh_da = skb->data; 2643 2644 if (mppath) 2645 mesh_da = mppath->mpp; 2646 else if (mpath) 2647 mesh_da = mpath->dst; 2648 2649 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2650 mesh_da, sdata->vif.addr); 2651 if (is_multicast_ether_addr(mesh_da)) 2652 /* DA TA mSA AE:SA */ 2653 meshhdrlen = ieee80211_new_mesh_header( 2654 sdata, &mesh_hdr, 2655 skb->data + ETH_ALEN, NULL); 2656 else 2657 /* RA TA mDA mSA AE:DA SA */ 2658 meshhdrlen = ieee80211_new_mesh_header( 2659 sdata, &mesh_hdr, skb->data, 2660 skb->data + ETH_ALEN); 2661 2662 } 2663 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2664 if (!chanctx_conf) { 2665 ret = -ENOTCONN; 2666 goto free; 2667 } 2668 band = chanctx_conf->def.chan->band; 2669 2670 /* For injected frames, fill RA right away as nexthop lookup 2671 * will be skipped. 2672 */ 2673 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2674 is_zero_ether_addr(hdr.addr1)) 2675 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2676 break; 2677 #endif 2678 case NL80211_IFTYPE_STATION: 2679 /* we already did checks when looking up the RA STA */ 2680 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2681 2682 if (tdls_peer) { 2683 /* DA SA BSSID */ 2684 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2685 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2686 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2687 hdrlen = 24; 2688 } else if (sdata->u.mgd.use_4addr && 2689 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2690 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2691 IEEE80211_FCTL_TODS); 2692 /* RA TA DA SA */ 2693 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2694 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2695 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2696 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2697 hdrlen = 30; 2698 } else { 2699 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2700 /* BSSID SA DA */ 2701 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2702 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2703 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2704 hdrlen = 24; 2705 } 2706 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2707 if (!chanctx_conf) { 2708 ret = -ENOTCONN; 2709 goto free; 2710 } 2711 band = chanctx_conf->def.chan->band; 2712 break; 2713 case NL80211_IFTYPE_OCB: 2714 /* DA SA BSSID */ 2715 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2716 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2717 eth_broadcast_addr(hdr.addr3); 2718 hdrlen = 24; 2719 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2720 if (!chanctx_conf) { 2721 ret = -ENOTCONN; 2722 goto free; 2723 } 2724 band = chanctx_conf->def.chan->band; 2725 break; 2726 case NL80211_IFTYPE_ADHOC: 2727 /* DA SA BSSID */ 2728 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2729 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2730 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2731 hdrlen = 24; 2732 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2733 if (!chanctx_conf) { 2734 ret = -ENOTCONN; 2735 goto free; 2736 } 2737 band = chanctx_conf->def.chan->band; 2738 break; 2739 default: 2740 ret = -EINVAL; 2741 goto free; 2742 } 2743 2744 multicast = is_multicast_ether_addr(hdr.addr1); 2745 2746 /* sta is always NULL for mesh */ 2747 if (sta) { 2748 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2749 wme_sta = sta->sta.wme; 2750 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2751 /* For mesh, the use of the QoS header is mandatory */ 2752 wme_sta = true; 2753 } 2754 2755 /* receiver does QoS (which also means we do) use it */ 2756 if (wme_sta) { 2757 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2758 hdrlen += 2; 2759 } 2760 2761 /* 2762 * Drop unicast frames to unauthorised stations unless they are 2763 * EAPOL frames from the local station. 2764 */ 2765 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2766 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2767 !multicast && !authorized && 2768 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2769 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2770 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2771 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2772 sdata->name, hdr.addr1); 2773 #endif 2774 2775 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2776 2777 ret = -EPERM; 2778 goto free; 2779 } 2780 2781 if (unlikely(!multicast && ((skb->sk && 2782 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2783 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2784 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2785 cookie); 2786 2787 /* 2788 * If the skb is shared we need to obtain our own copy. 2789 */ 2790 if (skb_shared(skb)) { 2791 struct sk_buff *tmp_skb = skb; 2792 2793 /* can't happen -- skb is a clone if info_id != 0 */ 2794 WARN_ON(info_id); 2795 2796 skb = skb_clone(skb, GFP_ATOMIC); 2797 kfree_skb(tmp_skb); 2798 2799 if (!skb) { 2800 ret = -ENOMEM; 2801 goto free; 2802 } 2803 } 2804 2805 hdr.frame_control = fc; 2806 hdr.duration_id = 0; 2807 hdr.seq_ctrl = 0; 2808 2809 skip_header_bytes = ETH_HLEN; 2810 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2811 encaps_data = bridge_tunnel_header; 2812 encaps_len = sizeof(bridge_tunnel_header); 2813 skip_header_bytes -= 2; 2814 } else if (ethertype >= ETH_P_802_3_MIN) { 2815 encaps_data = rfc1042_header; 2816 encaps_len = sizeof(rfc1042_header); 2817 skip_header_bytes -= 2; 2818 } else { 2819 encaps_data = NULL; 2820 encaps_len = 0; 2821 } 2822 2823 skb_pull(skb, skip_header_bytes); 2824 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2825 2826 /* 2827 * So we need to modify the skb header and hence need a copy of 2828 * that. The head_need variable above doesn't, so far, include 2829 * the needed header space that we don't need right away. If we 2830 * can, then we don't reallocate right now but only after the 2831 * frame arrives at the master device (if it does...) 2832 * 2833 * If we cannot, however, then we will reallocate to include all 2834 * the ever needed space. Also, if we need to reallocate it anyway, 2835 * make it big enough for everything we may ever need. 2836 */ 2837 2838 if (head_need > 0 || skb_cloned(skb)) { 2839 head_need += sdata->encrypt_headroom; 2840 head_need += local->tx_headroom; 2841 head_need = max_t(int, 0, head_need); 2842 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2843 ieee80211_free_txskb(&local->hw, skb); 2844 skb = NULL; 2845 return ERR_PTR(-ENOMEM); 2846 } 2847 } 2848 2849 if (encaps_data) 2850 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2851 2852 #ifdef CONFIG_MAC80211_MESH 2853 if (meshhdrlen > 0) 2854 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2855 #endif 2856 2857 if (ieee80211_is_data_qos(fc)) { 2858 __le16 *qos_control; 2859 2860 qos_control = skb_push(skb, 2); 2861 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2862 /* 2863 * Maybe we could actually set some fields here, for now just 2864 * initialise to zero to indicate no special operation. 2865 */ 2866 *qos_control = 0; 2867 } else 2868 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2869 2870 skb_reset_mac_header(skb); 2871 2872 info = IEEE80211_SKB_CB(skb); 2873 memset(info, 0, sizeof(*info)); 2874 2875 info->flags = info_flags; 2876 info->ack_frame_id = info_id; 2877 info->band = band; 2878 info->control.flags = ctrl_flags; 2879 2880 return skb; 2881 free: 2882 kfree_skb(skb); 2883 return ERR_PTR(ret); 2884 } 2885 2886 /* 2887 * fast-xmit overview 2888 * 2889 * The core idea of this fast-xmit is to remove per-packet checks by checking 2890 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2891 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2892 * much less work can be done per packet. For example, fragmentation must be 2893 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2894 * in the code here. 2895 * 2896 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2897 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2898 * 2899 * The most difficult part of this is that when any of these assumptions 2900 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2901 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2902 * since the per-packet code no longer checks the conditions. This is reflected 2903 * by the calls to these functions throughout the rest of the code, and must be 2904 * maintained if any of the TX path checks change. 2905 */ 2906 2907 void ieee80211_check_fast_xmit(struct sta_info *sta) 2908 { 2909 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2910 struct ieee80211_local *local = sta->local; 2911 struct ieee80211_sub_if_data *sdata = sta->sdata; 2912 struct ieee80211_hdr *hdr = (void *)build.hdr; 2913 struct ieee80211_chanctx_conf *chanctx_conf; 2914 __le16 fc; 2915 2916 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2917 return; 2918 2919 /* Locking here protects both the pointer itself, and against concurrent 2920 * invocations winning data access races to, e.g., the key pointer that 2921 * is used. 2922 * Without it, the invocation of this function right after the key 2923 * pointer changes wouldn't be sufficient, as another CPU could access 2924 * the pointer, then stall, and then do the cache update after the CPU 2925 * that invalidated the key. 2926 * With the locking, such scenarios cannot happen as the check for the 2927 * key and the fast-tx assignment are done atomically, so the CPU that 2928 * modifies the key will either wait or other one will see the key 2929 * cleared/changed already. 2930 */ 2931 spin_lock_bh(&sta->lock); 2932 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2933 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2934 sdata->vif.type == NL80211_IFTYPE_STATION) 2935 goto out; 2936 2937 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2938 goto out; 2939 2940 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2941 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2942 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2943 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2944 goto out; 2945 2946 if (sdata->noack_map) 2947 goto out; 2948 2949 /* fast-xmit doesn't handle fragmentation at all */ 2950 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2951 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2952 goto out; 2953 2954 rcu_read_lock(); 2955 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2956 if (!chanctx_conf) { 2957 rcu_read_unlock(); 2958 goto out; 2959 } 2960 build.band = chanctx_conf->def.chan->band; 2961 rcu_read_unlock(); 2962 2963 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2964 2965 switch (sdata->vif.type) { 2966 case NL80211_IFTYPE_ADHOC: 2967 /* DA SA BSSID */ 2968 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2969 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2970 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2971 build.hdr_len = 24; 2972 break; 2973 case NL80211_IFTYPE_STATION: 2974 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2975 /* DA SA BSSID */ 2976 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2977 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2978 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2979 build.hdr_len = 24; 2980 break; 2981 } 2982 2983 if (sdata->u.mgd.use_4addr) { 2984 /* non-regular ethertype cannot use the fastpath */ 2985 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2986 IEEE80211_FCTL_TODS); 2987 /* RA TA DA SA */ 2988 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2989 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2990 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2991 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2992 build.hdr_len = 30; 2993 break; 2994 } 2995 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2996 /* BSSID SA DA */ 2997 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2998 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2999 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3000 build.hdr_len = 24; 3001 break; 3002 case NL80211_IFTYPE_AP_VLAN: 3003 if (sdata->wdev.use_4addr) { 3004 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3005 IEEE80211_FCTL_TODS); 3006 /* RA TA DA SA */ 3007 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3008 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3009 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3010 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3011 build.hdr_len = 30; 3012 break; 3013 } 3014 fallthrough; 3015 case NL80211_IFTYPE_AP: 3016 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3017 /* DA BSSID SA */ 3018 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3019 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3020 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3021 build.hdr_len = 24; 3022 break; 3023 default: 3024 /* not handled on fast-xmit */ 3025 goto out; 3026 } 3027 3028 if (sta->sta.wme) { 3029 build.hdr_len += 2; 3030 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3031 } 3032 3033 /* We store the key here so there's no point in using rcu_dereference() 3034 * but that's fine because the code that changes the pointers will call 3035 * this function after doing so. For a single CPU that would be enough, 3036 * for multiple see the comment above. 3037 */ 3038 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3039 if (!build.key) 3040 build.key = rcu_access_pointer(sdata->default_unicast_key); 3041 if (build.key) { 3042 bool gen_iv, iv_spc, mmic; 3043 3044 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3045 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3046 mmic = build.key->conf.flags & 3047 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3048 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3049 3050 /* don't handle software crypto */ 3051 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3052 goto out; 3053 3054 /* Key is being removed */ 3055 if (build.key->flags & KEY_FLAG_TAINTED) 3056 goto out; 3057 3058 switch (build.key->conf.cipher) { 3059 case WLAN_CIPHER_SUITE_CCMP: 3060 case WLAN_CIPHER_SUITE_CCMP_256: 3061 if (gen_iv) 3062 build.pn_offs = build.hdr_len; 3063 if (gen_iv || iv_spc) 3064 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3065 break; 3066 case WLAN_CIPHER_SUITE_GCMP: 3067 case WLAN_CIPHER_SUITE_GCMP_256: 3068 if (gen_iv) 3069 build.pn_offs = build.hdr_len; 3070 if (gen_iv || iv_spc) 3071 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3072 break; 3073 case WLAN_CIPHER_SUITE_TKIP: 3074 /* cannot handle MMIC or IV generation in xmit-fast */ 3075 if (mmic || gen_iv) 3076 goto out; 3077 if (iv_spc) 3078 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3079 break; 3080 case WLAN_CIPHER_SUITE_WEP40: 3081 case WLAN_CIPHER_SUITE_WEP104: 3082 /* cannot handle IV generation in fast-xmit */ 3083 if (gen_iv) 3084 goto out; 3085 if (iv_spc) 3086 build.hdr_len += IEEE80211_WEP_IV_LEN; 3087 break; 3088 case WLAN_CIPHER_SUITE_AES_CMAC: 3089 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3090 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3091 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3092 WARN(1, 3093 "management cipher suite 0x%x enabled for data\n", 3094 build.key->conf.cipher); 3095 goto out; 3096 default: 3097 /* we don't know how to generate IVs for this at all */ 3098 if (WARN_ON(gen_iv)) 3099 goto out; 3100 /* pure hardware keys are OK, of course */ 3101 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3102 break; 3103 /* cipher scheme might require space allocation */ 3104 if (iv_spc && 3105 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3106 goto out; 3107 if (iv_spc) 3108 build.hdr_len += build.key->conf.iv_len; 3109 } 3110 3111 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3112 } 3113 3114 hdr->frame_control = fc; 3115 3116 memcpy(build.hdr + build.hdr_len, 3117 rfc1042_header, sizeof(rfc1042_header)); 3118 build.hdr_len += sizeof(rfc1042_header); 3119 3120 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3121 /* if the kmemdup fails, continue w/o fast_tx */ 3122 if (!fast_tx) 3123 goto out; 3124 3125 out: 3126 /* we might have raced against another call to this function */ 3127 old = rcu_dereference_protected(sta->fast_tx, 3128 lockdep_is_held(&sta->lock)); 3129 rcu_assign_pointer(sta->fast_tx, fast_tx); 3130 if (old) 3131 kfree_rcu(old, rcu_head); 3132 spin_unlock_bh(&sta->lock); 3133 } 3134 3135 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3136 { 3137 struct sta_info *sta; 3138 3139 rcu_read_lock(); 3140 list_for_each_entry_rcu(sta, &local->sta_list, list) 3141 ieee80211_check_fast_xmit(sta); 3142 rcu_read_unlock(); 3143 } 3144 3145 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3146 { 3147 struct ieee80211_local *local = sdata->local; 3148 struct sta_info *sta; 3149 3150 rcu_read_lock(); 3151 3152 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3153 if (sdata != sta->sdata && 3154 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3155 continue; 3156 ieee80211_check_fast_xmit(sta); 3157 } 3158 3159 rcu_read_unlock(); 3160 } 3161 3162 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3163 { 3164 struct ieee80211_fast_tx *fast_tx; 3165 3166 spin_lock_bh(&sta->lock); 3167 fast_tx = rcu_dereference_protected(sta->fast_tx, 3168 lockdep_is_held(&sta->lock)); 3169 RCU_INIT_POINTER(sta->fast_tx, NULL); 3170 spin_unlock_bh(&sta->lock); 3171 3172 if (fast_tx) 3173 kfree_rcu(fast_tx, rcu_head); 3174 } 3175 3176 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3177 struct sk_buff *skb, int headroom) 3178 { 3179 if (skb_headroom(skb) < headroom) { 3180 I802_DEBUG_INC(local->tx_expand_skb_head); 3181 3182 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3183 wiphy_debug(local->hw.wiphy, 3184 "failed to reallocate TX buffer\n"); 3185 return false; 3186 } 3187 } 3188 3189 return true; 3190 } 3191 3192 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3193 struct ieee80211_fast_tx *fast_tx, 3194 struct sk_buff *skb) 3195 { 3196 struct ieee80211_local *local = sdata->local; 3197 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3198 struct ieee80211_hdr *hdr; 3199 struct ethhdr *amsdu_hdr; 3200 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3201 int subframe_len = skb->len - hdr_len; 3202 void *data; 3203 u8 *qc, *h_80211_src, *h_80211_dst; 3204 const u8 *bssid; 3205 3206 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3207 return false; 3208 3209 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3210 return true; 3211 3212 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3213 return false; 3214 3215 data = skb_push(skb, sizeof(*amsdu_hdr)); 3216 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3217 hdr = data; 3218 amsdu_hdr = data + hdr_len; 3219 /* h_80211_src/dst is addr* field within hdr */ 3220 h_80211_src = data + fast_tx->sa_offs; 3221 h_80211_dst = data + fast_tx->da_offs; 3222 3223 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3224 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3225 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3226 3227 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3228 * fields needs to be changed to BSSID for A-MSDU frames depending 3229 * on FromDS/ToDS values. 3230 */ 3231 switch (sdata->vif.type) { 3232 case NL80211_IFTYPE_STATION: 3233 bssid = sdata->u.mgd.bssid; 3234 break; 3235 case NL80211_IFTYPE_AP: 3236 case NL80211_IFTYPE_AP_VLAN: 3237 bssid = sdata->vif.addr; 3238 break; 3239 default: 3240 bssid = NULL; 3241 } 3242 3243 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3244 ether_addr_copy(h_80211_src, bssid); 3245 3246 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3247 ether_addr_copy(h_80211_dst, bssid); 3248 3249 qc = ieee80211_get_qos_ctl(hdr); 3250 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3251 3252 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3253 3254 return true; 3255 } 3256 3257 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3258 struct sta_info *sta, 3259 struct ieee80211_fast_tx *fast_tx, 3260 struct sk_buff *skb) 3261 { 3262 struct ieee80211_local *local = sdata->local; 3263 struct fq *fq = &local->fq; 3264 struct fq_tin *tin; 3265 struct fq_flow *flow; 3266 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3267 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3268 struct txq_info *txqi; 3269 struct sk_buff **frag_tail, *head; 3270 int subframe_len = skb->len - ETH_ALEN; 3271 u8 max_subframes = sta->sta.max_amsdu_subframes; 3272 int max_frags = local->hw.max_tx_fragments; 3273 int max_amsdu_len = sta->sta.max_amsdu_len; 3274 int orig_truesize; 3275 u32 flow_idx; 3276 __be16 len; 3277 void *data; 3278 bool ret = false; 3279 unsigned int orig_len; 3280 int n = 2, nfrags, pad = 0; 3281 u16 hdrlen; 3282 3283 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3284 return false; 3285 3286 if (skb_is_gso(skb)) 3287 return false; 3288 3289 if (!txq) 3290 return false; 3291 3292 txqi = to_txq_info(txq); 3293 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3294 return false; 3295 3296 if (sta->sta.max_rc_amsdu_len) 3297 max_amsdu_len = min_t(int, max_amsdu_len, 3298 sta->sta.max_rc_amsdu_len); 3299 3300 if (sta->sta.max_tid_amsdu_len[tid]) 3301 max_amsdu_len = min_t(int, max_amsdu_len, 3302 sta->sta.max_tid_amsdu_len[tid]); 3303 3304 flow_idx = fq_flow_idx(fq, skb); 3305 3306 spin_lock_bh(&fq->lock); 3307 3308 /* TODO: Ideally aggregation should be done on dequeue to remain 3309 * responsive to environment changes. 3310 */ 3311 3312 tin = &txqi->tin; 3313 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3314 fq_flow_get_default_func); 3315 head = skb_peek_tail(&flow->queue); 3316 if (!head || skb_is_gso(head)) 3317 goto out; 3318 3319 orig_truesize = head->truesize; 3320 orig_len = head->len; 3321 3322 if (skb->len + head->len > max_amsdu_len) 3323 goto out; 3324 3325 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3326 nfrags += 1 + skb_shinfo(head)->nr_frags; 3327 frag_tail = &skb_shinfo(head)->frag_list; 3328 while (*frag_tail) { 3329 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3330 frag_tail = &(*frag_tail)->next; 3331 n++; 3332 } 3333 3334 if (max_subframes && n > max_subframes) 3335 goto out; 3336 3337 if (max_frags && nfrags > max_frags) 3338 goto out; 3339 3340 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3341 goto out; 3342 3343 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3344 goto out; 3345 3346 /* 3347 * Pad out the previous subframe to a multiple of 4 by adding the 3348 * padding to the next one, that's being added. Note that head->len 3349 * is the length of the full A-MSDU, but that works since each time 3350 * we add a new subframe we pad out the previous one to a multiple 3351 * of 4 and thus it no longer matters in the next round. 3352 */ 3353 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3354 if ((head->len - hdrlen) & 3) 3355 pad = 4 - ((head->len - hdrlen) & 3); 3356 3357 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3358 2 + pad)) 3359 goto out_recalc; 3360 3361 ret = true; 3362 data = skb_push(skb, ETH_ALEN + 2); 3363 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3364 3365 data += 2 * ETH_ALEN; 3366 len = cpu_to_be16(subframe_len); 3367 memcpy(data, &len, 2); 3368 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3369 3370 memset(skb_push(skb, pad), 0, pad); 3371 3372 head->len += skb->len; 3373 head->data_len += skb->len; 3374 *frag_tail = skb; 3375 3376 out_recalc: 3377 fq->memory_usage += head->truesize - orig_truesize; 3378 if (head->len != orig_len) { 3379 flow->backlog += head->len - orig_len; 3380 tin->backlog_bytes += head->len - orig_len; 3381 3382 fq_recalc_backlog(fq, tin, flow); 3383 } 3384 out: 3385 spin_unlock_bh(&fq->lock); 3386 3387 return ret; 3388 } 3389 3390 /* 3391 * Can be called while the sta lock is held. Anything that can cause packets to 3392 * be generated will cause deadlock! 3393 */ 3394 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3395 struct sta_info *sta, u8 pn_offs, 3396 struct ieee80211_key *key, 3397 struct sk_buff *skb) 3398 { 3399 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3400 struct ieee80211_hdr *hdr = (void *)skb->data; 3401 u8 tid = IEEE80211_NUM_TIDS; 3402 3403 if (key) 3404 info->control.hw_key = &key->conf; 3405 3406 ieee80211_tx_stats(skb->dev, skb->len); 3407 3408 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3409 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3410 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3411 } else { 3412 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3413 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3414 sdata->sequence_number += 0x10; 3415 } 3416 3417 if (skb_shinfo(skb)->gso_size) 3418 sta->tx_stats.msdu[tid] += 3419 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3420 else 3421 sta->tx_stats.msdu[tid]++; 3422 3423 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3424 3425 /* statistics normally done by ieee80211_tx_h_stats (but that 3426 * has to consider fragmentation, so is more complex) 3427 */ 3428 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3429 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3430 3431 if (pn_offs) { 3432 u64 pn; 3433 u8 *crypto_hdr = skb->data + pn_offs; 3434 3435 switch (key->conf.cipher) { 3436 case WLAN_CIPHER_SUITE_CCMP: 3437 case WLAN_CIPHER_SUITE_CCMP_256: 3438 case WLAN_CIPHER_SUITE_GCMP: 3439 case WLAN_CIPHER_SUITE_GCMP_256: 3440 pn = atomic64_inc_return(&key->conf.tx_pn); 3441 crypto_hdr[0] = pn; 3442 crypto_hdr[1] = pn >> 8; 3443 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3444 crypto_hdr[4] = pn >> 16; 3445 crypto_hdr[5] = pn >> 24; 3446 crypto_hdr[6] = pn >> 32; 3447 crypto_hdr[7] = pn >> 40; 3448 break; 3449 } 3450 } 3451 } 3452 3453 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3454 struct sta_info *sta, 3455 struct ieee80211_fast_tx *fast_tx, 3456 struct sk_buff *skb) 3457 { 3458 struct ieee80211_local *local = sdata->local; 3459 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3460 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3461 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3462 struct ethhdr eth; 3463 struct ieee80211_tx_info *info; 3464 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3465 struct ieee80211_tx_data tx; 3466 ieee80211_tx_result r; 3467 struct tid_ampdu_tx *tid_tx = NULL; 3468 u8 tid = IEEE80211_NUM_TIDS; 3469 3470 /* control port protocol needs a lot of special handling */ 3471 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3472 return false; 3473 3474 /* only RFC 1042 SNAP */ 3475 if (ethertype < ETH_P_802_3_MIN) 3476 return false; 3477 3478 /* don't handle TX status request here either */ 3479 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3480 return false; 3481 3482 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3483 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3484 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3485 if (tid_tx) { 3486 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3487 return false; 3488 if (tid_tx->timeout) 3489 tid_tx->last_tx = jiffies; 3490 } 3491 } 3492 3493 /* after this point (skb is modified) we cannot return false */ 3494 3495 if (skb_shared(skb)) { 3496 struct sk_buff *tmp_skb = skb; 3497 3498 skb = skb_clone(skb, GFP_ATOMIC); 3499 kfree_skb(tmp_skb); 3500 3501 if (!skb) 3502 return true; 3503 } 3504 3505 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3506 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3507 return true; 3508 3509 /* will not be crypto-handled beyond what we do here, so use false 3510 * as the may-encrypt argument for the resize to not account for 3511 * more room than we already have in 'extra_head' 3512 */ 3513 if (unlikely(ieee80211_skb_resize(sdata, skb, 3514 max_t(int, extra_head + hw_headroom - 3515 skb_headroom(skb), 0), 3516 ENCRYPT_NO))) { 3517 kfree_skb(skb); 3518 return true; 3519 } 3520 3521 memcpy(ð, skb->data, ETH_HLEN - 2); 3522 hdr = skb_push(skb, extra_head); 3523 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3524 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3525 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3526 3527 info = IEEE80211_SKB_CB(skb); 3528 memset(info, 0, sizeof(*info)); 3529 info->band = fast_tx->band; 3530 info->control.vif = &sdata->vif; 3531 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3532 IEEE80211_TX_CTL_DONTFRAG | 3533 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3534 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3535 3536 #ifdef CONFIG_MAC80211_DEBUGFS 3537 if (local->force_tx_status) 3538 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3539 #endif 3540 3541 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3542 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3543 *ieee80211_get_qos_ctl(hdr) = tid; 3544 } 3545 3546 __skb_queue_head_init(&tx.skbs); 3547 3548 tx.flags = IEEE80211_TX_UNICAST; 3549 tx.local = local; 3550 tx.sdata = sdata; 3551 tx.sta = sta; 3552 tx.key = fast_tx->key; 3553 3554 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3555 tx.skb = skb; 3556 r = ieee80211_tx_h_rate_ctrl(&tx); 3557 skb = tx.skb; 3558 tx.skb = NULL; 3559 3560 if (r != TX_CONTINUE) { 3561 if (r != TX_QUEUED) 3562 kfree_skb(skb); 3563 return true; 3564 } 3565 } 3566 3567 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3568 return true; 3569 3570 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3571 fast_tx->key, skb); 3572 3573 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3574 sdata = container_of(sdata->bss, 3575 struct ieee80211_sub_if_data, u.ap); 3576 3577 __skb_queue_tail(&tx.skbs, skb); 3578 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3579 return true; 3580 } 3581 3582 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3583 struct ieee80211_txq *txq) 3584 { 3585 struct ieee80211_local *local = hw_to_local(hw); 3586 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3587 struct ieee80211_hdr *hdr; 3588 struct sk_buff *skb = NULL; 3589 struct fq *fq = &local->fq; 3590 struct fq_tin *tin = &txqi->tin; 3591 struct ieee80211_tx_info *info; 3592 struct ieee80211_tx_data tx; 3593 ieee80211_tx_result r; 3594 struct ieee80211_vif *vif = txq->vif; 3595 3596 WARN_ON_ONCE(softirq_count() == 0); 3597 3598 if (!ieee80211_txq_airtime_check(hw, txq)) 3599 return NULL; 3600 3601 begin: 3602 spin_lock_bh(&fq->lock); 3603 3604 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3605 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3606 goto out; 3607 3608 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3609 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3610 goto out; 3611 } 3612 3613 /* Make sure fragments stay together. */ 3614 skb = __skb_dequeue(&txqi->frags); 3615 if (skb) 3616 goto out; 3617 3618 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3619 if (!skb) 3620 goto out; 3621 3622 spin_unlock_bh(&fq->lock); 3623 3624 hdr = (struct ieee80211_hdr *)skb->data; 3625 info = IEEE80211_SKB_CB(skb); 3626 3627 memset(&tx, 0, sizeof(tx)); 3628 __skb_queue_head_init(&tx.skbs); 3629 tx.local = local; 3630 tx.skb = skb; 3631 tx.sdata = vif_to_sdata(info->control.vif); 3632 3633 if (txq->sta) { 3634 tx.sta = container_of(txq->sta, struct sta_info, sta); 3635 /* 3636 * Drop unicast frames to unauthorised stations unless they are 3637 * injected frames or EAPOL frames from the local station. 3638 */ 3639 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3640 ieee80211_is_data(hdr->frame_control) && 3641 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3642 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3643 !is_multicast_ether_addr(hdr->addr1) && 3644 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3645 (!(info->control.flags & 3646 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3647 !ether_addr_equal(tx.sdata->vif.addr, 3648 hdr->addr2)))) { 3649 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3650 ieee80211_free_txskb(&local->hw, skb); 3651 goto begin; 3652 } 3653 } 3654 3655 /* 3656 * The key can be removed while the packet was queued, so need to call 3657 * this here to get the current key. 3658 */ 3659 r = ieee80211_tx_h_select_key(&tx); 3660 if (r != TX_CONTINUE) { 3661 ieee80211_free_txskb(&local->hw, skb); 3662 goto begin; 3663 } 3664 3665 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3666 info->flags |= IEEE80211_TX_CTL_AMPDU; 3667 else 3668 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3669 3670 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 3671 goto encap_out; 3672 3673 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3674 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3675 sta); 3676 u8 pn_offs = 0; 3677 3678 if (tx.key && 3679 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3680 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3681 3682 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3683 tx.key, skb); 3684 } else { 3685 if (invoke_tx_handlers_late(&tx)) 3686 goto begin; 3687 3688 skb = __skb_dequeue(&tx.skbs); 3689 3690 if (!skb_queue_empty(&tx.skbs)) { 3691 spin_lock_bh(&fq->lock); 3692 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3693 spin_unlock_bh(&fq->lock); 3694 } 3695 } 3696 3697 if (skb_has_frag_list(skb) && 3698 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3699 if (skb_linearize(skb)) { 3700 ieee80211_free_txskb(&local->hw, skb); 3701 goto begin; 3702 } 3703 } 3704 3705 switch (tx.sdata->vif.type) { 3706 case NL80211_IFTYPE_MONITOR: 3707 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3708 vif = &tx.sdata->vif; 3709 break; 3710 } 3711 tx.sdata = rcu_dereference(local->monitor_sdata); 3712 if (tx.sdata) { 3713 vif = &tx.sdata->vif; 3714 info->hw_queue = 3715 vif->hw_queue[skb_get_queue_mapping(skb)]; 3716 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3717 ieee80211_free_txskb(&local->hw, skb); 3718 goto begin; 3719 } else { 3720 vif = NULL; 3721 } 3722 break; 3723 case NL80211_IFTYPE_AP_VLAN: 3724 tx.sdata = container_of(tx.sdata->bss, 3725 struct ieee80211_sub_if_data, u.ap); 3726 fallthrough; 3727 default: 3728 vif = &tx.sdata->vif; 3729 break; 3730 } 3731 3732 encap_out: 3733 IEEE80211_SKB_CB(skb)->control.vif = vif; 3734 3735 if (vif && 3736 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3737 bool ampdu = txq->ac != IEEE80211_AC_VO; 3738 u32 airtime; 3739 3740 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3741 skb->len, ampdu); 3742 if (airtime) { 3743 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3744 ieee80211_sta_update_pending_airtime(local, tx.sta, 3745 txq->ac, 3746 airtime, 3747 false); 3748 } 3749 } 3750 3751 return skb; 3752 3753 out: 3754 spin_unlock_bh(&fq->lock); 3755 3756 return skb; 3757 } 3758 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3759 3760 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3761 { 3762 struct ieee80211_local *local = hw_to_local(hw); 3763 struct ieee80211_txq *ret = NULL; 3764 struct txq_info *txqi = NULL, *head = NULL; 3765 bool found_eligible_txq = false; 3766 3767 spin_lock_bh(&local->active_txq_lock[ac]); 3768 3769 begin: 3770 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3771 struct txq_info, 3772 schedule_order); 3773 if (!txqi) 3774 goto out; 3775 3776 if (txqi == head) { 3777 if (!found_eligible_txq) 3778 goto out; 3779 else 3780 found_eligible_txq = false; 3781 } 3782 3783 if (!head) 3784 head = txqi; 3785 3786 if (txqi->txq.sta) { 3787 struct sta_info *sta = container_of(txqi->txq.sta, 3788 struct sta_info, sta); 3789 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3790 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3791 3792 if (aql_check) 3793 found_eligible_txq = true; 3794 3795 if (deficit < 0) 3796 sta->airtime[txqi->txq.ac].deficit += 3797 sta->airtime_weight; 3798 3799 if (deficit < 0 || !aql_check) { 3800 list_move_tail(&txqi->schedule_order, 3801 &local->active_txqs[txqi->txq.ac]); 3802 goto begin; 3803 } 3804 } 3805 3806 3807 if (txqi->schedule_round == local->schedule_round[ac]) 3808 goto out; 3809 3810 list_del_init(&txqi->schedule_order); 3811 txqi->schedule_round = local->schedule_round[ac]; 3812 ret = &txqi->txq; 3813 3814 out: 3815 spin_unlock_bh(&local->active_txq_lock[ac]); 3816 return ret; 3817 } 3818 EXPORT_SYMBOL(ieee80211_next_txq); 3819 3820 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3821 struct ieee80211_txq *txq, 3822 bool force) 3823 { 3824 struct ieee80211_local *local = hw_to_local(hw); 3825 struct txq_info *txqi = to_txq_info(txq); 3826 3827 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3828 3829 if (list_empty(&txqi->schedule_order) && 3830 (force || !skb_queue_empty(&txqi->frags) || 3831 txqi->tin.backlog_packets)) { 3832 /* If airtime accounting is active, always enqueue STAs at the 3833 * head of the list to ensure that they only get moved to the 3834 * back by the airtime DRR scheduler once they have a negative 3835 * deficit. A station that already has a negative deficit will 3836 * get immediately moved to the back of the list on the next 3837 * call to ieee80211_next_txq(). 3838 */ 3839 if (txqi->txq.sta && 3840 wiphy_ext_feature_isset(local->hw.wiphy, 3841 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3842 list_add(&txqi->schedule_order, 3843 &local->active_txqs[txq->ac]); 3844 else 3845 list_add_tail(&txqi->schedule_order, 3846 &local->active_txqs[txq->ac]); 3847 } 3848 3849 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3850 } 3851 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3852 3853 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3854 struct ieee80211_txq *txq) 3855 { 3856 struct sta_info *sta; 3857 struct ieee80211_local *local = hw_to_local(hw); 3858 3859 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3860 return true; 3861 3862 if (!txq->sta) 3863 return true; 3864 3865 sta = container_of(txq->sta, struct sta_info, sta); 3866 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3867 sta->airtime[txq->ac].aql_limit_low) 3868 return true; 3869 3870 if (atomic_read(&local->aql_total_pending_airtime) < 3871 local->aql_threshold && 3872 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3873 sta->airtime[txq->ac].aql_limit_high) 3874 return true; 3875 3876 return false; 3877 } 3878 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3879 3880 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3881 struct ieee80211_txq *txq) 3882 { 3883 struct ieee80211_local *local = hw_to_local(hw); 3884 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3885 struct sta_info *sta; 3886 u8 ac = txq->ac; 3887 3888 spin_lock_bh(&local->active_txq_lock[ac]); 3889 3890 if (!txqi->txq.sta) 3891 goto out; 3892 3893 if (list_empty(&txqi->schedule_order)) 3894 goto out; 3895 3896 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3897 schedule_order) { 3898 if (iter == txqi) 3899 break; 3900 3901 if (!iter->txq.sta) { 3902 list_move_tail(&iter->schedule_order, 3903 &local->active_txqs[ac]); 3904 continue; 3905 } 3906 sta = container_of(iter->txq.sta, struct sta_info, sta); 3907 if (sta->airtime[ac].deficit < 0) 3908 sta->airtime[ac].deficit += sta->airtime_weight; 3909 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3910 } 3911 3912 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3913 if (sta->airtime[ac].deficit >= 0) 3914 goto out; 3915 3916 sta->airtime[ac].deficit += sta->airtime_weight; 3917 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3918 spin_unlock_bh(&local->active_txq_lock[ac]); 3919 3920 return false; 3921 out: 3922 if (!list_empty(&txqi->schedule_order)) 3923 list_del_init(&txqi->schedule_order); 3924 spin_unlock_bh(&local->active_txq_lock[ac]); 3925 3926 return true; 3927 } 3928 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3929 3930 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3931 { 3932 struct ieee80211_local *local = hw_to_local(hw); 3933 3934 spin_lock_bh(&local->active_txq_lock[ac]); 3935 local->schedule_round[ac]++; 3936 spin_unlock_bh(&local->active_txq_lock[ac]); 3937 } 3938 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3939 3940 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3941 struct net_device *dev, 3942 u32 info_flags, 3943 u32 ctrl_flags, 3944 u64 *cookie) 3945 { 3946 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3947 struct ieee80211_local *local = sdata->local; 3948 struct sta_info *sta; 3949 struct sk_buff *next; 3950 3951 if (unlikely(skb->len < ETH_HLEN)) { 3952 kfree_skb(skb); 3953 return; 3954 } 3955 3956 rcu_read_lock(); 3957 3958 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3959 goto out_free; 3960 3961 if (IS_ERR(sta)) 3962 sta = NULL; 3963 3964 if (local->ops->wake_tx_queue) { 3965 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3966 skb_set_queue_mapping(skb, queue); 3967 skb_get_hash(skb); 3968 } 3969 3970 if (sta) { 3971 struct ieee80211_fast_tx *fast_tx; 3972 3973 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3974 3975 fast_tx = rcu_dereference(sta->fast_tx); 3976 3977 if (fast_tx && 3978 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3979 goto out; 3980 } 3981 3982 if (skb_is_gso(skb)) { 3983 struct sk_buff *segs; 3984 3985 segs = skb_gso_segment(skb, 0); 3986 if (IS_ERR(segs)) { 3987 goto out_free; 3988 } else if (segs) { 3989 consume_skb(skb); 3990 skb = segs; 3991 } 3992 } else { 3993 /* we cannot process non-linear frames on this path */ 3994 if (skb_linearize(skb)) { 3995 kfree_skb(skb); 3996 goto out; 3997 } 3998 3999 /* the frame could be fragmented, software-encrypted, and other 4000 * things so we cannot really handle checksum offload with it - 4001 * fix it up in software before we handle anything else. 4002 */ 4003 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4004 skb_set_transport_header(skb, 4005 skb_checksum_start_offset(skb)); 4006 if (skb_checksum_help(skb)) 4007 goto out_free; 4008 } 4009 } 4010 4011 skb_list_walk_safe(skb, skb, next) { 4012 skb_mark_not_on_list(skb); 4013 4014 if (skb->protocol == sdata->control_port_protocol) 4015 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4016 4017 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4018 sta, ctrl_flags, cookie); 4019 if (IS_ERR(skb)) { 4020 kfree_skb_list(next); 4021 goto out; 4022 } 4023 4024 ieee80211_tx_stats(dev, skb->len); 4025 4026 ieee80211_xmit(sdata, sta, skb); 4027 } 4028 goto out; 4029 out_free: 4030 kfree_skb(skb); 4031 out: 4032 rcu_read_unlock(); 4033 } 4034 4035 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4036 { 4037 struct ethhdr *eth; 4038 int err; 4039 4040 err = skb_ensure_writable(skb, ETH_HLEN); 4041 if (unlikely(err)) 4042 return err; 4043 4044 eth = (void *)skb->data; 4045 ether_addr_copy(eth->h_dest, sta->sta.addr); 4046 4047 return 0; 4048 } 4049 4050 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4051 struct net_device *dev) 4052 { 4053 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4054 const struct ethhdr *eth = (void *)skb->data; 4055 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4056 __be16 ethertype; 4057 4058 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4059 return false; 4060 4061 switch (sdata->vif.type) { 4062 case NL80211_IFTYPE_AP_VLAN: 4063 if (sdata->u.vlan.sta) 4064 return false; 4065 if (sdata->wdev.use_4addr) 4066 return false; 4067 fallthrough; 4068 case NL80211_IFTYPE_AP: 4069 /* check runtime toggle for this bss */ 4070 if (!sdata->bss->multicast_to_unicast) 4071 return false; 4072 break; 4073 default: 4074 return false; 4075 } 4076 4077 /* multicast to unicast conversion only for some payload */ 4078 ethertype = eth->h_proto; 4079 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4080 ethertype = ethvlan->h_vlan_encapsulated_proto; 4081 switch (ethertype) { 4082 case htons(ETH_P_ARP): 4083 case htons(ETH_P_IP): 4084 case htons(ETH_P_IPV6): 4085 break; 4086 default: 4087 return false; 4088 } 4089 4090 return true; 4091 } 4092 4093 static void 4094 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4095 struct sk_buff_head *queue) 4096 { 4097 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4098 struct ieee80211_local *local = sdata->local; 4099 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4100 struct sta_info *sta, *first = NULL; 4101 struct sk_buff *cloned_skb; 4102 4103 rcu_read_lock(); 4104 4105 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4106 if (sdata != sta->sdata) 4107 /* AP-VLAN mismatch */ 4108 continue; 4109 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4110 /* do not send back to source */ 4111 continue; 4112 if (!first) { 4113 first = sta; 4114 continue; 4115 } 4116 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4117 if (!cloned_skb) 4118 goto multicast; 4119 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4120 dev_kfree_skb(cloned_skb); 4121 goto multicast; 4122 } 4123 __skb_queue_tail(queue, cloned_skb); 4124 } 4125 4126 if (likely(first)) { 4127 if (unlikely(ieee80211_change_da(skb, first))) 4128 goto multicast; 4129 __skb_queue_tail(queue, skb); 4130 } else { 4131 /* no STA connected, drop */ 4132 kfree_skb(skb); 4133 skb = NULL; 4134 } 4135 4136 goto out; 4137 multicast: 4138 __skb_queue_purge(queue); 4139 __skb_queue_tail(queue, skb); 4140 out: 4141 rcu_read_unlock(); 4142 } 4143 4144 /** 4145 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4146 * @skb: packet to be sent 4147 * @dev: incoming interface 4148 * 4149 * On failure skb will be freed. 4150 */ 4151 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4152 struct net_device *dev) 4153 { 4154 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4155 struct sk_buff_head queue; 4156 4157 __skb_queue_head_init(&queue); 4158 ieee80211_convert_to_unicast(skb, dev, &queue); 4159 while ((skb = __skb_dequeue(&queue))) 4160 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4161 } else { 4162 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4163 } 4164 4165 return NETDEV_TX_OK; 4166 } 4167 4168 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4169 struct sk_buff *skb, int led_len, 4170 struct sta_info *sta, 4171 bool txpending) 4172 { 4173 struct ieee80211_local *local = sdata->local; 4174 struct ieee80211_tx_control control = {}; 4175 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4176 struct ieee80211_sta *pubsta = NULL; 4177 unsigned long flags; 4178 int q = info->hw_queue; 4179 4180 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4181 return true; 4182 4183 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4184 4185 if (local->queue_stop_reasons[q] || 4186 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4187 if (txpending) 4188 skb_queue_head(&local->pending[q], skb); 4189 else 4190 skb_queue_tail(&local->pending[q], skb); 4191 4192 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4193 4194 return false; 4195 } 4196 4197 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4198 4199 if (sta && sta->uploaded) 4200 pubsta = &sta->sta; 4201 4202 control.sta = pubsta; 4203 4204 drv_tx(local, &control, skb); 4205 4206 return true; 4207 } 4208 4209 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4210 struct net_device *dev, struct sta_info *sta, 4211 struct ieee80211_key *key, struct sk_buff *skb) 4212 { 4213 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4214 struct ieee80211_local *local = sdata->local; 4215 struct tid_ampdu_tx *tid_tx; 4216 u8 tid; 4217 4218 if (local->ops->wake_tx_queue) { 4219 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4220 skb_set_queue_mapping(skb, queue); 4221 skb_get_hash(skb); 4222 } 4223 4224 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4225 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4226 goto out_free; 4227 4228 memset(info, 0, sizeof(*info)); 4229 4230 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4231 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4232 if (tid_tx) { 4233 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4234 /* fall back to non-offload slow path */ 4235 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4236 return; 4237 } 4238 4239 info->flags |= IEEE80211_TX_CTL_AMPDU; 4240 if (tid_tx->timeout) 4241 tid_tx->last_tx = jiffies; 4242 } 4243 4244 if (unlikely(skb->sk && 4245 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4246 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4247 &info->flags, NULL); 4248 4249 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4250 4251 ieee80211_tx_stats(dev, skb->len); 4252 4253 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4254 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4255 4256 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4257 sdata = container_of(sdata->bss, 4258 struct ieee80211_sub_if_data, u.ap); 4259 4260 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4261 info->control.vif = &sdata->vif; 4262 4263 if (key) 4264 info->control.hw_key = &key->conf; 4265 4266 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4267 4268 return; 4269 4270 out_free: 4271 kfree_skb(skb); 4272 } 4273 4274 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4275 struct net_device *dev) 4276 { 4277 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4278 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4279 struct ieee80211_key *key; 4280 struct sta_info *sta; 4281 bool offload = true; 4282 4283 if (unlikely(skb->len < ETH_HLEN)) { 4284 kfree_skb(skb); 4285 return NETDEV_TX_OK; 4286 } 4287 4288 rcu_read_lock(); 4289 4290 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4291 kfree_skb(skb); 4292 goto out; 4293 } 4294 4295 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4296 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4297 sdata->control_port_protocol == ehdr->h_proto)) 4298 offload = false; 4299 else if ((key = rcu_dereference(sta->ptk[sta->ptk_idx])) && 4300 (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4301 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4302 offload = false; 4303 4304 if (offload) 4305 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4306 else 4307 ieee80211_subif_start_xmit(skb, dev); 4308 4309 out: 4310 rcu_read_unlock(); 4311 4312 return NETDEV_TX_OK; 4313 } 4314 4315 struct sk_buff * 4316 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4317 struct sk_buff *skb, u32 info_flags) 4318 { 4319 struct ieee80211_hdr *hdr; 4320 struct ieee80211_tx_data tx = { 4321 .local = sdata->local, 4322 .sdata = sdata, 4323 }; 4324 struct sta_info *sta; 4325 4326 rcu_read_lock(); 4327 4328 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4329 kfree_skb(skb); 4330 skb = ERR_PTR(-EINVAL); 4331 goto out; 4332 } 4333 4334 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4335 if (IS_ERR(skb)) 4336 goto out; 4337 4338 hdr = (void *)skb->data; 4339 tx.sta = sta_info_get(sdata, hdr->addr1); 4340 tx.skb = skb; 4341 4342 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4343 rcu_read_unlock(); 4344 kfree_skb(skb); 4345 return ERR_PTR(-EINVAL); 4346 } 4347 4348 out: 4349 rcu_read_unlock(); 4350 return skb; 4351 } 4352 4353 /* 4354 * ieee80211_clear_tx_pending may not be called in a context where 4355 * it is possible that it packets could come in again. 4356 */ 4357 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4358 { 4359 struct sk_buff *skb; 4360 int i; 4361 4362 for (i = 0; i < local->hw.queues; i++) { 4363 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4364 ieee80211_free_txskb(&local->hw, skb); 4365 } 4366 } 4367 4368 /* 4369 * Returns false if the frame couldn't be transmitted but was queued instead, 4370 * which in this case means re-queued -- take as an indication to stop sending 4371 * more pending frames. 4372 */ 4373 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4374 struct sk_buff *skb) 4375 { 4376 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4377 struct ieee80211_sub_if_data *sdata; 4378 struct sta_info *sta; 4379 struct ieee80211_hdr *hdr; 4380 bool result; 4381 struct ieee80211_chanctx_conf *chanctx_conf; 4382 4383 sdata = vif_to_sdata(info->control.vif); 4384 4385 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4386 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4387 if (unlikely(!chanctx_conf)) { 4388 dev_kfree_skb(skb); 4389 return true; 4390 } 4391 info->band = chanctx_conf->def.chan->band; 4392 result = ieee80211_tx(sdata, NULL, skb, true); 4393 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4394 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4395 dev_kfree_skb(skb); 4396 return true; 4397 } 4398 4399 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4400 sta = NULL; 4401 4402 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4403 } else { 4404 struct sk_buff_head skbs; 4405 4406 __skb_queue_head_init(&skbs); 4407 __skb_queue_tail(&skbs, skb); 4408 4409 hdr = (struct ieee80211_hdr *)skb->data; 4410 sta = sta_info_get(sdata, hdr->addr1); 4411 4412 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4413 } 4414 4415 return result; 4416 } 4417 4418 /* 4419 * Transmit all pending packets. Called from tasklet. 4420 */ 4421 void ieee80211_tx_pending(unsigned long data) 4422 { 4423 struct ieee80211_local *local = (struct ieee80211_local *)data; 4424 unsigned long flags; 4425 int i; 4426 bool txok; 4427 4428 rcu_read_lock(); 4429 4430 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4431 for (i = 0; i < local->hw.queues; i++) { 4432 /* 4433 * If queue is stopped by something other than due to pending 4434 * frames, or we have no pending frames, proceed to next queue. 4435 */ 4436 if (local->queue_stop_reasons[i] || 4437 skb_queue_empty(&local->pending[i])) 4438 continue; 4439 4440 while (!skb_queue_empty(&local->pending[i])) { 4441 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4442 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4443 4444 if (WARN_ON(!info->control.vif)) { 4445 ieee80211_free_txskb(&local->hw, skb); 4446 continue; 4447 } 4448 4449 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4450 flags); 4451 4452 txok = ieee80211_tx_pending_skb(local, skb); 4453 spin_lock_irqsave(&local->queue_stop_reason_lock, 4454 flags); 4455 if (!txok) 4456 break; 4457 } 4458 4459 if (skb_queue_empty(&local->pending[i])) 4460 ieee80211_propagate_queue_wake(local, i); 4461 } 4462 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4463 4464 rcu_read_unlock(); 4465 } 4466 4467 /* functions for drivers to get certain frames */ 4468 4469 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4470 struct ps_data *ps, struct sk_buff *skb, 4471 bool is_template) 4472 { 4473 u8 *pos, *tim; 4474 int aid0 = 0; 4475 int i, have_bits = 0, n1, n2; 4476 4477 /* Generate bitmap for TIM only if there are any STAs in power save 4478 * mode. */ 4479 if (atomic_read(&ps->num_sta_ps) > 0) 4480 /* in the hope that this is faster than 4481 * checking byte-for-byte */ 4482 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4483 IEEE80211_MAX_AID+1); 4484 if (!is_template) { 4485 if (ps->dtim_count == 0) 4486 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4487 else 4488 ps->dtim_count--; 4489 } 4490 4491 tim = pos = skb_put(skb, 6); 4492 *pos++ = WLAN_EID_TIM; 4493 *pos++ = 4; 4494 *pos++ = ps->dtim_count; 4495 *pos++ = sdata->vif.bss_conf.dtim_period; 4496 4497 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4498 aid0 = 1; 4499 4500 ps->dtim_bc_mc = aid0 == 1; 4501 4502 if (have_bits) { 4503 /* Find largest even number N1 so that bits numbered 1 through 4504 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4505 * (N2 + 1) x 8 through 2007 are 0. */ 4506 n1 = 0; 4507 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4508 if (ps->tim[i]) { 4509 n1 = i & 0xfe; 4510 break; 4511 } 4512 } 4513 n2 = n1; 4514 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4515 if (ps->tim[i]) { 4516 n2 = i; 4517 break; 4518 } 4519 } 4520 4521 /* Bitmap control */ 4522 *pos++ = n1 | aid0; 4523 /* Part Virt Bitmap */ 4524 skb_put(skb, n2 - n1); 4525 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4526 4527 tim[1] = n2 - n1 + 4; 4528 } else { 4529 *pos++ = aid0; /* Bitmap control */ 4530 *pos++ = 0; /* Part Virt Bitmap */ 4531 } 4532 } 4533 4534 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4535 struct ps_data *ps, struct sk_buff *skb, 4536 bool is_template) 4537 { 4538 struct ieee80211_local *local = sdata->local; 4539 4540 /* 4541 * Not very nice, but we want to allow the driver to call 4542 * ieee80211_beacon_get() as a response to the set_tim() 4543 * callback. That, however, is already invoked under the 4544 * sta_lock to guarantee consistent and race-free update 4545 * of the tim bitmap in mac80211 and the driver. 4546 */ 4547 if (local->tim_in_locked_section) { 4548 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4549 } else { 4550 spin_lock_bh(&local->tim_lock); 4551 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4552 spin_unlock_bh(&local->tim_lock); 4553 } 4554 4555 return 0; 4556 } 4557 4558 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4559 struct beacon_data *beacon) 4560 { 4561 struct probe_resp *resp; 4562 u8 *beacon_data; 4563 size_t beacon_data_len; 4564 int i; 4565 u8 count = beacon->cntdwn_current_counter; 4566 4567 switch (sdata->vif.type) { 4568 case NL80211_IFTYPE_AP: 4569 beacon_data = beacon->tail; 4570 beacon_data_len = beacon->tail_len; 4571 break; 4572 case NL80211_IFTYPE_ADHOC: 4573 beacon_data = beacon->head; 4574 beacon_data_len = beacon->head_len; 4575 break; 4576 case NL80211_IFTYPE_MESH_POINT: 4577 beacon_data = beacon->head; 4578 beacon_data_len = beacon->head_len; 4579 break; 4580 default: 4581 return; 4582 } 4583 4584 rcu_read_lock(); 4585 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4586 resp = rcu_dereference(sdata->u.ap.probe_resp); 4587 4588 if (beacon->cntdwn_counter_offsets[i]) { 4589 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4590 beacon_data_len)) { 4591 rcu_read_unlock(); 4592 return; 4593 } 4594 4595 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4596 } 4597 4598 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4599 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4600 } 4601 rcu_read_unlock(); 4602 } 4603 4604 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4605 { 4606 beacon->cntdwn_current_counter--; 4607 4608 /* the counter should never reach 0 */ 4609 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4610 4611 return beacon->cntdwn_current_counter; 4612 } 4613 4614 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4615 { 4616 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4617 struct beacon_data *beacon = NULL; 4618 u8 count = 0; 4619 4620 rcu_read_lock(); 4621 4622 if (sdata->vif.type == NL80211_IFTYPE_AP) 4623 beacon = rcu_dereference(sdata->u.ap.beacon); 4624 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4625 beacon = rcu_dereference(sdata->u.ibss.presp); 4626 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4627 beacon = rcu_dereference(sdata->u.mesh.beacon); 4628 4629 if (!beacon) 4630 goto unlock; 4631 4632 count = __ieee80211_beacon_update_cntdwn(beacon); 4633 4634 unlock: 4635 rcu_read_unlock(); 4636 return count; 4637 } 4638 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4639 4640 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4641 { 4642 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4643 struct beacon_data *beacon = NULL; 4644 4645 rcu_read_lock(); 4646 4647 if (sdata->vif.type == NL80211_IFTYPE_AP) 4648 beacon = rcu_dereference(sdata->u.ap.beacon); 4649 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4650 beacon = rcu_dereference(sdata->u.ibss.presp); 4651 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4652 beacon = rcu_dereference(sdata->u.mesh.beacon); 4653 4654 if (!beacon) 4655 goto unlock; 4656 4657 if (counter < beacon->cntdwn_current_counter) 4658 beacon->cntdwn_current_counter = counter; 4659 4660 unlock: 4661 rcu_read_unlock(); 4662 } 4663 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4664 4665 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4666 { 4667 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4668 struct beacon_data *beacon = NULL; 4669 u8 *beacon_data; 4670 size_t beacon_data_len; 4671 int ret = false; 4672 4673 if (!ieee80211_sdata_running(sdata)) 4674 return false; 4675 4676 rcu_read_lock(); 4677 if (vif->type == NL80211_IFTYPE_AP) { 4678 struct ieee80211_if_ap *ap = &sdata->u.ap; 4679 4680 beacon = rcu_dereference(ap->beacon); 4681 if (WARN_ON(!beacon || !beacon->tail)) 4682 goto out; 4683 beacon_data = beacon->tail; 4684 beacon_data_len = beacon->tail_len; 4685 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4686 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4687 4688 beacon = rcu_dereference(ifibss->presp); 4689 if (!beacon) 4690 goto out; 4691 4692 beacon_data = beacon->head; 4693 beacon_data_len = beacon->head_len; 4694 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4695 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4696 4697 beacon = rcu_dereference(ifmsh->beacon); 4698 if (!beacon) 4699 goto out; 4700 4701 beacon_data = beacon->head; 4702 beacon_data_len = beacon->head_len; 4703 } else { 4704 WARN_ON(1); 4705 goto out; 4706 } 4707 4708 if (!beacon->cntdwn_counter_offsets[0]) 4709 goto out; 4710 4711 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4712 goto out; 4713 4714 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4715 ret = true; 4716 4717 out: 4718 rcu_read_unlock(); 4719 4720 return ret; 4721 } 4722 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4723 4724 static int ieee80211_beacon_protect(struct sk_buff *skb, 4725 struct ieee80211_local *local, 4726 struct ieee80211_sub_if_data *sdata) 4727 { 4728 ieee80211_tx_result res; 4729 struct ieee80211_tx_data tx; 4730 struct sk_buff *check_skb; 4731 4732 memset(&tx, 0, sizeof(tx)); 4733 tx.key = rcu_dereference(sdata->default_beacon_key); 4734 if (!tx.key) 4735 return 0; 4736 tx.local = local; 4737 tx.sdata = sdata; 4738 __skb_queue_head_init(&tx.skbs); 4739 __skb_queue_tail(&tx.skbs, skb); 4740 res = ieee80211_tx_h_encrypt(&tx); 4741 check_skb = __skb_dequeue(&tx.skbs); 4742 /* we may crash after this, but it'd be a bug in crypto */ 4743 WARN_ON(check_skb != skb); 4744 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4745 return -EINVAL; 4746 4747 return 0; 4748 } 4749 4750 static struct sk_buff * 4751 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4752 struct ieee80211_vif *vif, 4753 struct ieee80211_mutable_offsets *offs, 4754 bool is_template) 4755 { 4756 struct ieee80211_local *local = hw_to_local(hw); 4757 struct beacon_data *beacon = NULL; 4758 struct sk_buff *skb = NULL; 4759 struct ieee80211_tx_info *info; 4760 struct ieee80211_sub_if_data *sdata = NULL; 4761 enum nl80211_band band; 4762 struct ieee80211_tx_rate_control txrc; 4763 struct ieee80211_chanctx_conf *chanctx_conf; 4764 int csa_off_base = 0; 4765 4766 rcu_read_lock(); 4767 4768 sdata = vif_to_sdata(vif); 4769 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4770 4771 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4772 goto out; 4773 4774 if (offs) 4775 memset(offs, 0, sizeof(*offs)); 4776 4777 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4778 struct ieee80211_if_ap *ap = &sdata->u.ap; 4779 4780 beacon = rcu_dereference(ap->beacon); 4781 if (beacon) { 4782 if (beacon->cntdwn_counter_offsets[0]) { 4783 if (!is_template) 4784 ieee80211_beacon_update_cntdwn(vif); 4785 4786 ieee80211_set_beacon_cntdwn(sdata, beacon); 4787 } 4788 4789 /* 4790 * headroom, head length, 4791 * tail length and maximum TIM length 4792 */ 4793 skb = dev_alloc_skb(local->tx_headroom + 4794 beacon->head_len + 4795 beacon->tail_len + 256 + 4796 local->hw.extra_beacon_tailroom); 4797 if (!skb) 4798 goto out; 4799 4800 skb_reserve(skb, local->tx_headroom); 4801 skb_put_data(skb, beacon->head, beacon->head_len); 4802 4803 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4804 is_template); 4805 4806 if (offs) { 4807 offs->tim_offset = beacon->head_len; 4808 offs->tim_length = skb->len - beacon->head_len; 4809 4810 /* for AP the csa offsets are from tail */ 4811 csa_off_base = skb->len; 4812 } 4813 4814 if (beacon->tail) 4815 skb_put_data(skb, beacon->tail, 4816 beacon->tail_len); 4817 4818 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4819 goto out; 4820 } else 4821 goto out; 4822 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4823 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4824 struct ieee80211_hdr *hdr; 4825 4826 beacon = rcu_dereference(ifibss->presp); 4827 if (!beacon) 4828 goto out; 4829 4830 if (beacon->cntdwn_counter_offsets[0]) { 4831 if (!is_template) 4832 __ieee80211_beacon_update_cntdwn(beacon); 4833 4834 ieee80211_set_beacon_cntdwn(sdata, beacon); 4835 } 4836 4837 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4838 local->hw.extra_beacon_tailroom); 4839 if (!skb) 4840 goto out; 4841 skb_reserve(skb, local->tx_headroom); 4842 skb_put_data(skb, beacon->head, beacon->head_len); 4843 4844 hdr = (struct ieee80211_hdr *) skb->data; 4845 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4846 IEEE80211_STYPE_BEACON); 4847 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4848 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4849 4850 beacon = rcu_dereference(ifmsh->beacon); 4851 if (!beacon) 4852 goto out; 4853 4854 if (beacon->cntdwn_counter_offsets[0]) { 4855 if (!is_template) 4856 /* TODO: For mesh csa_counter is in TU, so 4857 * decrementing it by one isn't correct, but 4858 * for now we leave it consistent with overall 4859 * mac80211's behavior. 4860 */ 4861 __ieee80211_beacon_update_cntdwn(beacon); 4862 4863 ieee80211_set_beacon_cntdwn(sdata, beacon); 4864 } 4865 4866 if (ifmsh->sync_ops) 4867 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4868 4869 skb = dev_alloc_skb(local->tx_headroom + 4870 beacon->head_len + 4871 256 + /* TIM IE */ 4872 beacon->tail_len + 4873 local->hw.extra_beacon_tailroom); 4874 if (!skb) 4875 goto out; 4876 skb_reserve(skb, local->tx_headroom); 4877 skb_put_data(skb, beacon->head, beacon->head_len); 4878 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4879 4880 if (offs) { 4881 offs->tim_offset = beacon->head_len; 4882 offs->tim_length = skb->len - beacon->head_len; 4883 } 4884 4885 skb_put_data(skb, beacon->tail, beacon->tail_len); 4886 } else { 4887 WARN_ON(1); 4888 goto out; 4889 } 4890 4891 /* CSA offsets */ 4892 if (offs && beacon) { 4893 int i; 4894 4895 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4896 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 4897 4898 if (!csa_off) 4899 continue; 4900 4901 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 4902 } 4903 } 4904 4905 band = chanctx_conf->def.chan->band; 4906 4907 info = IEEE80211_SKB_CB(skb); 4908 4909 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4910 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4911 info->band = band; 4912 4913 memset(&txrc, 0, sizeof(txrc)); 4914 txrc.hw = hw; 4915 txrc.sband = local->hw.wiphy->bands[band]; 4916 txrc.bss_conf = &sdata->vif.bss_conf; 4917 txrc.skb = skb; 4918 txrc.reported_rate.idx = -1; 4919 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4920 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4921 else 4922 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4923 txrc.bss = true; 4924 rate_control_get_rate(sdata, NULL, &txrc); 4925 4926 info->control.vif = vif; 4927 4928 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4929 IEEE80211_TX_CTL_ASSIGN_SEQ | 4930 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4931 out: 4932 rcu_read_unlock(); 4933 return skb; 4934 4935 } 4936 4937 struct sk_buff * 4938 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4939 struct ieee80211_vif *vif, 4940 struct ieee80211_mutable_offsets *offs) 4941 { 4942 return __ieee80211_beacon_get(hw, vif, offs, true); 4943 } 4944 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4945 4946 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4947 struct ieee80211_vif *vif, 4948 u16 *tim_offset, u16 *tim_length) 4949 { 4950 struct ieee80211_mutable_offsets offs = {}; 4951 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4952 struct sk_buff *copy; 4953 struct ieee80211_supported_band *sband; 4954 int shift; 4955 4956 if (!bcn) 4957 return bcn; 4958 4959 if (tim_offset) 4960 *tim_offset = offs.tim_offset; 4961 4962 if (tim_length) 4963 *tim_length = offs.tim_length; 4964 4965 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4966 !hw_to_local(hw)->monitors) 4967 return bcn; 4968 4969 /* send a copy to monitor interfaces */ 4970 copy = skb_copy(bcn, GFP_ATOMIC); 4971 if (!copy) 4972 return bcn; 4973 4974 shift = ieee80211_vif_get_shift(vif); 4975 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4976 if (!sband) 4977 return bcn; 4978 4979 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4980 NULL); 4981 4982 return bcn; 4983 } 4984 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4985 4986 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4987 struct ieee80211_vif *vif) 4988 { 4989 struct ieee80211_if_ap *ap = NULL; 4990 struct sk_buff *skb = NULL; 4991 struct probe_resp *presp = NULL; 4992 struct ieee80211_hdr *hdr; 4993 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4994 4995 if (sdata->vif.type != NL80211_IFTYPE_AP) 4996 return NULL; 4997 4998 rcu_read_lock(); 4999 5000 ap = &sdata->u.ap; 5001 presp = rcu_dereference(ap->probe_resp); 5002 if (!presp) 5003 goto out; 5004 5005 skb = dev_alloc_skb(presp->len); 5006 if (!skb) 5007 goto out; 5008 5009 skb_put_data(skb, presp->data, presp->len); 5010 5011 hdr = (struct ieee80211_hdr *) skb->data; 5012 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5013 5014 out: 5015 rcu_read_unlock(); 5016 return skb; 5017 } 5018 EXPORT_SYMBOL(ieee80211_proberesp_get); 5019 5020 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5021 struct ieee80211_vif *vif) 5022 { 5023 struct sk_buff *skb = NULL; 5024 struct fils_discovery_data *tmpl = NULL; 5025 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5026 5027 if (sdata->vif.type != NL80211_IFTYPE_AP) 5028 return NULL; 5029 5030 rcu_read_lock(); 5031 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5032 if (!tmpl) { 5033 rcu_read_unlock(); 5034 return NULL; 5035 } 5036 5037 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5038 if (skb) { 5039 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5040 skb_put_data(skb, tmpl->data, tmpl->len); 5041 } 5042 5043 rcu_read_unlock(); 5044 return skb; 5045 } 5046 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5047 5048 struct sk_buff * 5049 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5050 struct ieee80211_vif *vif) 5051 { 5052 struct sk_buff *skb = NULL; 5053 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5054 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5055 5056 if (sdata->vif.type != NL80211_IFTYPE_AP) 5057 return NULL; 5058 5059 rcu_read_lock(); 5060 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5061 if (!tmpl) { 5062 rcu_read_unlock(); 5063 return NULL; 5064 } 5065 5066 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5067 if (skb) { 5068 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5069 skb_put_data(skb, tmpl->data, tmpl->len); 5070 } 5071 5072 rcu_read_unlock(); 5073 return skb; 5074 } 5075 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5076 5077 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5078 struct ieee80211_vif *vif) 5079 { 5080 struct ieee80211_sub_if_data *sdata; 5081 struct ieee80211_if_managed *ifmgd; 5082 struct ieee80211_pspoll *pspoll; 5083 struct ieee80211_local *local; 5084 struct sk_buff *skb; 5085 5086 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5087 return NULL; 5088 5089 sdata = vif_to_sdata(vif); 5090 ifmgd = &sdata->u.mgd; 5091 local = sdata->local; 5092 5093 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5094 if (!skb) 5095 return NULL; 5096 5097 skb_reserve(skb, local->hw.extra_tx_headroom); 5098 5099 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5100 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5101 IEEE80211_STYPE_PSPOLL); 5102 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5103 5104 /* aid in PS-Poll has its two MSBs each set to 1 */ 5105 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5106 5107 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5108 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5109 5110 return skb; 5111 } 5112 EXPORT_SYMBOL(ieee80211_pspoll_get); 5113 5114 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5115 struct ieee80211_vif *vif, 5116 bool qos_ok) 5117 { 5118 struct ieee80211_hdr_3addr *nullfunc; 5119 struct ieee80211_sub_if_data *sdata; 5120 struct ieee80211_if_managed *ifmgd; 5121 struct ieee80211_local *local; 5122 struct sk_buff *skb; 5123 bool qos = false; 5124 5125 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5126 return NULL; 5127 5128 sdata = vif_to_sdata(vif); 5129 ifmgd = &sdata->u.mgd; 5130 local = sdata->local; 5131 5132 if (qos_ok) { 5133 struct sta_info *sta; 5134 5135 rcu_read_lock(); 5136 sta = sta_info_get(sdata, ifmgd->bssid); 5137 qos = sta && sta->sta.wme; 5138 rcu_read_unlock(); 5139 } 5140 5141 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5142 sizeof(*nullfunc) + 2); 5143 if (!skb) 5144 return NULL; 5145 5146 skb_reserve(skb, local->hw.extra_tx_headroom); 5147 5148 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5149 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5150 IEEE80211_STYPE_NULLFUNC | 5151 IEEE80211_FCTL_TODS); 5152 if (qos) { 5153 __le16 qoshdr = cpu_to_le16(7); 5154 5155 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5156 IEEE80211_STYPE_NULLFUNC) != 5157 IEEE80211_STYPE_QOS_NULLFUNC); 5158 nullfunc->frame_control |= 5159 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5160 skb->priority = 7; 5161 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5162 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5163 } 5164 5165 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5166 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5167 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5168 5169 return skb; 5170 } 5171 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5172 5173 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5174 const u8 *src_addr, 5175 const u8 *ssid, size_t ssid_len, 5176 size_t tailroom) 5177 { 5178 struct ieee80211_local *local = hw_to_local(hw); 5179 struct ieee80211_hdr_3addr *hdr; 5180 struct sk_buff *skb; 5181 size_t ie_ssid_len; 5182 u8 *pos; 5183 5184 ie_ssid_len = 2 + ssid_len; 5185 5186 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5187 ie_ssid_len + tailroom); 5188 if (!skb) 5189 return NULL; 5190 5191 skb_reserve(skb, local->hw.extra_tx_headroom); 5192 5193 hdr = skb_put_zero(skb, sizeof(*hdr)); 5194 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5195 IEEE80211_STYPE_PROBE_REQ); 5196 eth_broadcast_addr(hdr->addr1); 5197 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5198 eth_broadcast_addr(hdr->addr3); 5199 5200 pos = skb_put(skb, ie_ssid_len); 5201 *pos++ = WLAN_EID_SSID; 5202 *pos++ = ssid_len; 5203 if (ssid_len) 5204 memcpy(pos, ssid, ssid_len); 5205 pos += ssid_len; 5206 5207 return skb; 5208 } 5209 EXPORT_SYMBOL(ieee80211_probereq_get); 5210 5211 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5212 const void *frame, size_t frame_len, 5213 const struct ieee80211_tx_info *frame_txctl, 5214 struct ieee80211_rts *rts) 5215 { 5216 const struct ieee80211_hdr *hdr = frame; 5217 5218 rts->frame_control = 5219 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5220 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5221 frame_txctl); 5222 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5223 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5224 } 5225 EXPORT_SYMBOL(ieee80211_rts_get); 5226 5227 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5228 const void *frame, size_t frame_len, 5229 const struct ieee80211_tx_info *frame_txctl, 5230 struct ieee80211_cts *cts) 5231 { 5232 const struct ieee80211_hdr *hdr = frame; 5233 5234 cts->frame_control = 5235 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5236 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5237 frame_len, frame_txctl); 5238 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5239 } 5240 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5241 5242 struct sk_buff * 5243 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5244 struct ieee80211_vif *vif) 5245 { 5246 struct ieee80211_local *local = hw_to_local(hw); 5247 struct sk_buff *skb = NULL; 5248 struct ieee80211_tx_data tx; 5249 struct ieee80211_sub_if_data *sdata; 5250 struct ps_data *ps; 5251 struct ieee80211_tx_info *info; 5252 struct ieee80211_chanctx_conf *chanctx_conf; 5253 5254 sdata = vif_to_sdata(vif); 5255 5256 rcu_read_lock(); 5257 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5258 5259 if (!chanctx_conf) 5260 goto out; 5261 5262 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5263 struct beacon_data *beacon = 5264 rcu_dereference(sdata->u.ap.beacon); 5265 5266 if (!beacon || !beacon->head) 5267 goto out; 5268 5269 ps = &sdata->u.ap.ps; 5270 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5271 ps = &sdata->u.mesh.ps; 5272 } else { 5273 goto out; 5274 } 5275 5276 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5277 goto out; /* send buffered bc/mc only after DTIM beacon */ 5278 5279 while (1) { 5280 skb = skb_dequeue(&ps->bc_buf); 5281 if (!skb) 5282 goto out; 5283 local->total_ps_buffered--; 5284 5285 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5286 struct ieee80211_hdr *hdr = 5287 (struct ieee80211_hdr *) skb->data; 5288 /* more buffered multicast/broadcast frames ==> set 5289 * MoreData flag in IEEE 802.11 header to inform PS 5290 * STAs */ 5291 hdr->frame_control |= 5292 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5293 } 5294 5295 if (sdata->vif.type == NL80211_IFTYPE_AP) 5296 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5297 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5298 break; 5299 ieee80211_free_txskb(hw, skb); 5300 } 5301 5302 info = IEEE80211_SKB_CB(skb); 5303 5304 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5305 info->band = chanctx_conf->def.chan->band; 5306 5307 if (invoke_tx_handlers(&tx)) 5308 skb = NULL; 5309 out: 5310 rcu_read_unlock(); 5311 5312 return skb; 5313 } 5314 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5315 5316 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5317 { 5318 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5319 struct ieee80211_sub_if_data *sdata = sta->sdata; 5320 struct ieee80211_local *local = sdata->local; 5321 int ret; 5322 u32 queues; 5323 5324 lockdep_assert_held(&local->sta_mtx); 5325 5326 /* only some cases are supported right now */ 5327 switch (sdata->vif.type) { 5328 case NL80211_IFTYPE_STATION: 5329 case NL80211_IFTYPE_AP: 5330 case NL80211_IFTYPE_AP_VLAN: 5331 break; 5332 default: 5333 WARN_ON(1); 5334 return -EINVAL; 5335 } 5336 5337 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5338 return -EINVAL; 5339 5340 if (sta->reserved_tid == tid) { 5341 ret = 0; 5342 goto out; 5343 } 5344 5345 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5346 sdata_err(sdata, "TID reservation already active\n"); 5347 ret = -EALREADY; 5348 goto out; 5349 } 5350 5351 ieee80211_stop_vif_queues(sdata->local, sdata, 5352 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5353 5354 synchronize_net(); 5355 5356 /* Tear down BA sessions so we stop aggregating on this TID */ 5357 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5358 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5359 __ieee80211_stop_tx_ba_session(sta, tid, 5360 AGG_STOP_LOCAL_REQUEST); 5361 } 5362 5363 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5364 __ieee80211_flush_queues(local, sdata, queues, false); 5365 5366 sta->reserved_tid = tid; 5367 5368 ieee80211_wake_vif_queues(local, sdata, 5369 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5370 5371 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5372 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5373 5374 ret = 0; 5375 out: 5376 return ret; 5377 } 5378 EXPORT_SYMBOL(ieee80211_reserve_tid); 5379 5380 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5381 { 5382 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5383 struct ieee80211_sub_if_data *sdata = sta->sdata; 5384 5385 lockdep_assert_held(&sdata->local->sta_mtx); 5386 5387 /* only some cases are supported right now */ 5388 switch (sdata->vif.type) { 5389 case NL80211_IFTYPE_STATION: 5390 case NL80211_IFTYPE_AP: 5391 case NL80211_IFTYPE_AP_VLAN: 5392 break; 5393 default: 5394 WARN_ON(1); 5395 return; 5396 } 5397 5398 if (tid != sta->reserved_tid) { 5399 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5400 return; 5401 } 5402 5403 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5404 } 5405 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5406 5407 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5408 struct sk_buff *skb, int tid, 5409 enum nl80211_band band) 5410 { 5411 int ac = ieee80211_ac_from_tid(tid); 5412 5413 skb_reset_mac_header(skb); 5414 skb_set_queue_mapping(skb, ac); 5415 skb->priority = tid; 5416 5417 skb->dev = sdata->dev; 5418 5419 /* 5420 * The other path calling ieee80211_xmit is from the tasklet, 5421 * and while we can handle concurrent transmissions locking 5422 * requirements are that we do not come into tx with bhs on. 5423 */ 5424 local_bh_disable(); 5425 IEEE80211_SKB_CB(skb)->band = band; 5426 ieee80211_xmit(sdata, NULL, skb); 5427 local_bh_enable(); 5428 } 5429 5430 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5431 const u8 *buf, size_t len, 5432 const u8 *dest, __be16 proto, bool unencrypted, 5433 u64 *cookie) 5434 { 5435 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5436 struct ieee80211_local *local = sdata->local; 5437 struct sk_buff *skb; 5438 struct ethhdr *ehdr; 5439 u32 ctrl_flags = 0; 5440 u32 flags = 0; 5441 5442 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5443 * or Pre-Authentication 5444 */ 5445 if (proto != sdata->control_port_protocol && 5446 proto != cpu_to_be16(ETH_P_PREAUTH)) 5447 return -EINVAL; 5448 5449 if (proto == sdata->control_port_protocol) 5450 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5451 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5452 5453 if (unencrypted) 5454 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5455 5456 if (cookie) 5457 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5458 5459 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX | 5460 IEEE80211_TX_CTL_INJECTED; 5461 5462 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5463 sizeof(struct ethhdr) + len); 5464 if (!skb) 5465 return -ENOMEM; 5466 5467 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5468 5469 skb_put_data(skb, buf, len); 5470 5471 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5472 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5473 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5474 ehdr->h_proto = proto; 5475 5476 skb->dev = dev; 5477 skb->protocol = htons(ETH_P_802_3); 5478 skb_reset_network_header(skb); 5479 skb_reset_mac_header(skb); 5480 5481 /* mutex lock is only needed for incrementing the cookie counter */ 5482 mutex_lock(&local->mtx); 5483 5484 local_bh_disable(); 5485 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5486 local_bh_enable(); 5487 5488 mutex_unlock(&local->mtx); 5489 5490 return 0; 5491 } 5492 5493 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5494 const u8 *buf, size_t len) 5495 { 5496 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5497 struct ieee80211_local *local = sdata->local; 5498 struct sk_buff *skb; 5499 5500 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5501 30 + /* header size */ 5502 18); /* 11s header size */ 5503 if (!skb) 5504 return -ENOMEM; 5505 5506 skb_reserve(skb, local->hw.extra_tx_headroom); 5507 skb_put_data(skb, buf, len); 5508 5509 skb->dev = dev; 5510 skb->protocol = htons(ETH_P_802_3); 5511 skb_reset_network_header(skb); 5512 skb_reset_mac_header(skb); 5513 5514 local_bh_disable(); 5515 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5516 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5517 NULL); 5518 local_bh_enable(); 5519 5520 return 0; 5521 } 5522