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->flags & IEEE80211_TX_PS_BUFFERED) 323 return TX_CONTINUE; 324 325 if (tx->sta) 326 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 327 328 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 329 if (unlikely(!assoc && 330 ieee80211_is_data(hdr->frame_control))) { 331 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 332 sdata_info(tx->sdata, 333 "dropped data frame to not associated station %pM\n", 334 hdr->addr1); 335 #endif 336 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 337 return TX_DROP; 338 } 339 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 340 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 341 /* 342 * No associated STAs - no need to send multicast 343 * frames. 344 */ 345 return TX_DROP; 346 } 347 348 return TX_CONTINUE; 349 } 350 351 /* This function is called whenever the AP is about to exceed the maximum limit 352 * of buffered frames for power saving STAs. This situation should not really 353 * happen often during normal operation, so dropping the oldest buffered packet 354 * from each queue should be OK to make some room for new frames. */ 355 static void purge_old_ps_buffers(struct ieee80211_local *local) 356 { 357 int total = 0, purged = 0; 358 struct sk_buff *skb; 359 struct ieee80211_sub_if_data *sdata; 360 struct sta_info *sta; 361 362 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 363 struct ps_data *ps; 364 365 if (sdata->vif.type == NL80211_IFTYPE_AP) 366 ps = &sdata->u.ap.ps; 367 else if (ieee80211_vif_is_mesh(&sdata->vif)) 368 ps = &sdata->u.mesh.ps; 369 else 370 continue; 371 372 skb = skb_dequeue(&ps->bc_buf); 373 if (skb) { 374 purged++; 375 ieee80211_free_txskb(&local->hw, skb); 376 } 377 total += skb_queue_len(&ps->bc_buf); 378 } 379 380 /* 381 * Drop one frame from each station from the lowest-priority 382 * AC that has frames at all. 383 */ 384 list_for_each_entry_rcu(sta, &local->sta_list, list) { 385 int ac; 386 387 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 388 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 389 total += skb_queue_len(&sta->ps_tx_buf[ac]); 390 if (skb) { 391 purged++; 392 ieee80211_free_txskb(&local->hw, skb); 393 break; 394 } 395 } 396 } 397 398 local->total_ps_buffered = total; 399 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 400 } 401 402 static ieee80211_tx_result 403 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 404 { 405 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 406 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 407 struct ps_data *ps; 408 409 /* 410 * broadcast/multicast frame 411 * 412 * If any of the associated/peer stations is in power save mode, 413 * the frame is buffered to be sent after DTIM beacon frame. 414 * This is done either by the hardware or us. 415 */ 416 417 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 418 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 419 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 420 if (!tx->sdata->bss) 421 return TX_CONTINUE; 422 423 ps = &tx->sdata->bss->ps; 424 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 425 ps = &tx->sdata->u.mesh.ps; 426 } else { 427 return TX_CONTINUE; 428 } 429 430 431 /* no buffering for ordered frames */ 432 if (ieee80211_has_order(hdr->frame_control)) 433 return TX_CONTINUE; 434 435 if (ieee80211_is_probe_req(hdr->frame_control)) 436 return TX_CONTINUE; 437 438 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 439 info->hw_queue = tx->sdata->vif.cab_queue; 440 441 /* no stations in PS mode and no buffered packets */ 442 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 443 return TX_CONTINUE; 444 445 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 446 447 /* device releases frame after DTIM beacon */ 448 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 449 return TX_CONTINUE; 450 451 /* buffered in mac80211 */ 452 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 453 purge_old_ps_buffers(tx->local); 454 455 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 456 ps_dbg(tx->sdata, 457 "BC TX buffer full - dropping the oldest frame\n"); 458 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 459 } else 460 tx->local->total_ps_buffered++; 461 462 skb_queue_tail(&ps->bc_buf, tx->skb); 463 464 return TX_QUEUED; 465 } 466 467 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 468 struct sk_buff *skb) 469 { 470 if (!ieee80211_is_mgmt(fc)) 471 return 0; 472 473 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 474 return 0; 475 476 if (!ieee80211_is_robust_mgmt_frame(skb)) 477 return 0; 478 479 return 1; 480 } 481 482 static ieee80211_tx_result 483 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 484 { 485 struct sta_info *sta = tx->sta; 486 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 487 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 488 struct ieee80211_local *local = tx->local; 489 490 if (unlikely(!sta)) 491 return TX_CONTINUE; 492 493 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 494 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 495 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 496 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 497 int ac = skb_get_queue_mapping(tx->skb); 498 499 if (ieee80211_is_mgmt(hdr->frame_control) && 500 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 501 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 502 return TX_CONTINUE; 503 } 504 505 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 506 sta->sta.addr, sta->sta.aid, ac); 507 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 508 purge_old_ps_buffers(tx->local); 509 510 /* sync with ieee80211_sta_ps_deliver_wakeup */ 511 spin_lock(&sta->ps_lock); 512 /* 513 * STA woke up the meantime and all the frames on ps_tx_buf have 514 * been queued to pending queue. No reordering can happen, go 515 * ahead and Tx the packet. 516 */ 517 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 518 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 519 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 520 spin_unlock(&sta->ps_lock); 521 return TX_CONTINUE; 522 } 523 524 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 525 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 526 ps_dbg(tx->sdata, 527 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 528 sta->sta.addr, ac); 529 ieee80211_free_txskb(&local->hw, old); 530 } else 531 tx->local->total_ps_buffered++; 532 533 info->control.jiffies = jiffies; 534 info->control.vif = &tx->sdata->vif; 535 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 536 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 537 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 538 spin_unlock(&sta->ps_lock); 539 540 if (!timer_pending(&local->sta_cleanup)) 541 mod_timer(&local->sta_cleanup, 542 round_jiffies(jiffies + 543 STA_INFO_CLEANUP_INTERVAL)); 544 545 /* 546 * We queued up some frames, so the TIM bit might 547 * need to be set, recalculate it. 548 */ 549 sta_info_recalc_tim(sta); 550 551 return TX_QUEUED; 552 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 553 ps_dbg(tx->sdata, 554 "STA %pM in PS mode, but polling/in SP -> send frame\n", 555 sta->sta.addr); 556 } 557 558 return TX_CONTINUE; 559 } 560 561 static ieee80211_tx_result debug_noinline 562 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 563 { 564 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 565 return TX_CONTINUE; 566 567 if (tx->flags & IEEE80211_TX_UNICAST) 568 return ieee80211_tx_h_unicast_ps_buf(tx); 569 else 570 return ieee80211_tx_h_multicast_ps_buf(tx); 571 } 572 573 static ieee80211_tx_result debug_noinline 574 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 575 { 576 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 577 578 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 579 if (tx->sdata->control_port_no_encrypt) 580 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 581 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 582 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 583 } 584 585 return TX_CONTINUE; 586 } 587 588 static ieee80211_tx_result debug_noinline 589 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 590 { 591 struct ieee80211_key *key; 592 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 593 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 594 595 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 596 tx->key = NULL; 597 return TX_CONTINUE; 598 } 599 600 if (tx->sta && 601 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 602 tx->key = key; 603 else if (ieee80211_is_group_privacy_action(tx->skb) && 604 (key = rcu_dereference(tx->sdata->default_multicast_key))) 605 tx->key = key; 606 else if (ieee80211_is_mgmt(hdr->frame_control) && 607 is_multicast_ether_addr(hdr->addr1) && 608 ieee80211_is_robust_mgmt_frame(tx->skb) && 609 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 610 tx->key = key; 611 else if (is_multicast_ether_addr(hdr->addr1) && 612 (key = rcu_dereference(tx->sdata->default_multicast_key))) 613 tx->key = key; 614 else if (!is_multicast_ether_addr(hdr->addr1) && 615 (key = rcu_dereference(tx->sdata->default_unicast_key))) 616 tx->key = key; 617 else 618 tx->key = NULL; 619 620 if (tx->key) { 621 bool skip_hw = false; 622 623 /* TODO: add threshold stuff again */ 624 625 switch (tx->key->conf.cipher) { 626 case WLAN_CIPHER_SUITE_WEP40: 627 case WLAN_CIPHER_SUITE_WEP104: 628 case WLAN_CIPHER_SUITE_TKIP: 629 if (!ieee80211_is_data_present(hdr->frame_control)) 630 tx->key = NULL; 631 break; 632 case WLAN_CIPHER_SUITE_CCMP: 633 case WLAN_CIPHER_SUITE_CCMP_256: 634 case WLAN_CIPHER_SUITE_GCMP: 635 case WLAN_CIPHER_SUITE_GCMP_256: 636 if (!ieee80211_is_data_present(hdr->frame_control) && 637 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 638 tx->skb) && 639 !ieee80211_is_group_privacy_action(tx->skb)) 640 tx->key = NULL; 641 else 642 skip_hw = (tx->key->conf.flags & 643 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 644 ieee80211_is_mgmt(hdr->frame_control); 645 break; 646 case WLAN_CIPHER_SUITE_AES_CMAC: 647 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 648 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 649 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 650 if (!ieee80211_is_mgmt(hdr->frame_control)) 651 tx->key = NULL; 652 break; 653 } 654 655 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 656 !ieee80211_is_deauth(hdr->frame_control))) 657 return TX_DROP; 658 659 if (!skip_hw && tx->key && 660 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 661 info->control.hw_key = &tx->key->conf; 662 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta && 663 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 664 return TX_DROP; 665 } 666 667 return TX_CONTINUE; 668 } 669 670 static ieee80211_tx_result debug_noinline 671 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 672 { 673 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 674 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 675 struct ieee80211_supported_band *sband; 676 u32 len; 677 struct ieee80211_tx_rate_control txrc; 678 struct ieee80211_sta_rates *ratetbl = NULL; 679 bool assoc = false; 680 681 memset(&txrc, 0, sizeof(txrc)); 682 683 sband = tx->local->hw.wiphy->bands[info->band]; 684 685 len = min_t(u32, tx->skb->len + FCS_LEN, 686 tx->local->hw.wiphy->frag_threshold); 687 688 /* set up the tx rate control struct we give the RC algo */ 689 txrc.hw = &tx->local->hw; 690 txrc.sband = sband; 691 txrc.bss_conf = &tx->sdata->vif.bss_conf; 692 txrc.skb = tx->skb; 693 txrc.reported_rate.idx = -1; 694 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 695 696 if (tx->sdata->rc_has_mcs_mask[info->band]) 697 txrc.rate_idx_mcs_mask = 698 tx->sdata->rc_rateidx_mcs_mask[info->band]; 699 700 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 701 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 702 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 703 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 704 705 /* set up RTS protection if desired */ 706 if (len > tx->local->hw.wiphy->rts_threshold) { 707 txrc.rts = true; 708 } 709 710 info->control.use_rts = txrc.rts; 711 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 712 713 /* 714 * Use short preamble if the BSS can handle it, but not for 715 * management frames unless we know the receiver can handle 716 * that -- the management frame might be to a station that 717 * just wants a probe response. 718 */ 719 if (tx->sdata->vif.bss_conf.use_short_preamble && 720 (ieee80211_is_data(hdr->frame_control) || 721 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 722 txrc.short_preamble = true; 723 724 info->control.short_preamble = txrc.short_preamble; 725 726 /* don't ask rate control when rate already injected via radiotap */ 727 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 728 return TX_CONTINUE; 729 730 if (tx->sta) 731 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 732 733 /* 734 * Lets not bother rate control if we're associated and cannot 735 * talk to the sta. This should not happen. 736 */ 737 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 738 !rate_usable_index_exists(sband, &tx->sta->sta), 739 "%s: Dropped data frame as no usable bitrate found while " 740 "scanning and associated. Target station: " 741 "%pM on %d GHz band\n", 742 tx->sdata->name, hdr->addr1, 743 info->band ? 5 : 2)) 744 return TX_DROP; 745 746 /* 747 * If we're associated with the sta at this point we know we can at 748 * least send the frame at the lowest bit rate. 749 */ 750 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 751 752 if (tx->sta && !info->control.skip_table) 753 ratetbl = rcu_dereference(tx->sta->sta.rates); 754 755 if (unlikely(info->control.rates[0].idx < 0)) { 756 if (ratetbl) { 757 struct ieee80211_tx_rate rate = { 758 .idx = ratetbl->rate[0].idx, 759 .flags = ratetbl->rate[0].flags, 760 .count = ratetbl->rate[0].count 761 }; 762 763 if (ratetbl->rate[0].idx < 0) 764 return TX_DROP; 765 766 tx->rate = rate; 767 } else { 768 return TX_DROP; 769 } 770 } else { 771 tx->rate = info->control.rates[0]; 772 } 773 774 if (txrc.reported_rate.idx < 0) { 775 txrc.reported_rate = tx->rate; 776 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 777 tx->sta->tx_stats.last_rate = txrc.reported_rate; 778 } else if (tx->sta) 779 tx->sta->tx_stats.last_rate = txrc.reported_rate; 780 781 if (ratetbl) 782 return TX_CONTINUE; 783 784 if (unlikely(!info->control.rates[0].count)) 785 info->control.rates[0].count = 1; 786 787 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 788 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 789 info->control.rates[0].count = 1; 790 791 return TX_CONTINUE; 792 } 793 794 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 795 { 796 u16 *seq = &sta->tid_seq[tid]; 797 __le16 ret = cpu_to_le16(*seq); 798 799 /* Increase the sequence number. */ 800 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 801 802 return ret; 803 } 804 805 static ieee80211_tx_result debug_noinline 806 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 807 { 808 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 809 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 810 int tid; 811 812 /* 813 * Packet injection may want to control the sequence 814 * number, if we have no matching interface then we 815 * neither assign one ourselves nor ask the driver to. 816 */ 817 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 818 return TX_CONTINUE; 819 820 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 821 return TX_CONTINUE; 822 823 if (ieee80211_hdrlen(hdr->frame_control) < 24) 824 return TX_CONTINUE; 825 826 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 827 return TX_CONTINUE; 828 829 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 830 return TX_CONTINUE; 831 832 /* 833 * Anything but QoS data that has a sequence number field 834 * (is long enough) gets a sequence number from the global 835 * counter. QoS data frames with a multicast destination 836 * also use the global counter (802.11-2012 9.3.2.10). 837 */ 838 if (!ieee80211_is_data_qos(hdr->frame_control) || 839 is_multicast_ether_addr(hdr->addr1)) { 840 /* driver should assign sequence number */ 841 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 842 /* for pure STA mode without beacons, we can do it */ 843 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 844 tx->sdata->sequence_number += 0x10; 845 if (tx->sta) 846 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 847 return TX_CONTINUE; 848 } 849 850 /* 851 * This should be true for injected/management frames only, for 852 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 853 * above since they are not QoS-data frames. 854 */ 855 if (!tx->sta) 856 return TX_CONTINUE; 857 858 /* include per-STA, per-TID sequence counter */ 859 tid = ieee80211_get_tid(hdr); 860 tx->sta->tx_stats.msdu[tid]++; 861 862 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 863 864 return TX_CONTINUE; 865 } 866 867 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 868 struct sk_buff *skb, int hdrlen, 869 int frag_threshold) 870 { 871 struct ieee80211_local *local = tx->local; 872 struct ieee80211_tx_info *info; 873 struct sk_buff *tmp; 874 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 875 int pos = hdrlen + per_fragm; 876 int rem = skb->len - hdrlen - per_fragm; 877 878 if (WARN_ON(rem < 0)) 879 return -EINVAL; 880 881 /* first fragment was already added to queue by caller */ 882 883 while (rem) { 884 int fraglen = per_fragm; 885 886 if (fraglen > rem) 887 fraglen = rem; 888 rem -= fraglen; 889 tmp = dev_alloc_skb(local->tx_headroom + 890 frag_threshold + 891 tx->sdata->encrypt_headroom + 892 IEEE80211_ENCRYPT_TAILROOM); 893 if (!tmp) 894 return -ENOMEM; 895 896 __skb_queue_tail(&tx->skbs, tmp); 897 898 skb_reserve(tmp, 899 local->tx_headroom + tx->sdata->encrypt_headroom); 900 901 /* copy control information */ 902 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 903 904 info = IEEE80211_SKB_CB(tmp); 905 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 906 IEEE80211_TX_CTL_FIRST_FRAGMENT); 907 908 if (rem) 909 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 910 911 skb_copy_queue_mapping(tmp, skb); 912 tmp->priority = skb->priority; 913 tmp->dev = skb->dev; 914 915 /* copy header and data */ 916 skb_put_data(tmp, skb->data, hdrlen); 917 skb_put_data(tmp, skb->data + pos, fraglen); 918 919 pos += fraglen; 920 } 921 922 /* adjust first fragment's length */ 923 skb_trim(skb, hdrlen + per_fragm); 924 return 0; 925 } 926 927 static ieee80211_tx_result debug_noinline 928 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 929 { 930 struct sk_buff *skb = tx->skb; 931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 932 struct ieee80211_hdr *hdr = (void *)skb->data; 933 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 934 int hdrlen; 935 int fragnum; 936 937 /* no matter what happens, tx->skb moves to tx->skbs */ 938 __skb_queue_tail(&tx->skbs, skb); 939 tx->skb = NULL; 940 941 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 942 return TX_CONTINUE; 943 944 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 945 return TX_CONTINUE; 946 947 /* 948 * Warn when submitting a fragmented A-MPDU frame and drop it. 949 * This scenario is handled in ieee80211_tx_prepare but extra 950 * caution taken here as fragmented ampdu may cause Tx stop. 951 */ 952 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 953 return TX_DROP; 954 955 hdrlen = ieee80211_hdrlen(hdr->frame_control); 956 957 /* internal error, why isn't DONTFRAG set? */ 958 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 959 return TX_DROP; 960 961 /* 962 * Now fragment the frame. This will allocate all the fragments and 963 * chain them (using skb as the first fragment) to skb->next. 964 * During transmission, we will remove the successfully transmitted 965 * fragments from this list. When the low-level driver rejects one 966 * of the fragments then we will simply pretend to accept the skb 967 * but store it away as pending. 968 */ 969 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 970 return TX_DROP; 971 972 /* update duration/seq/flags of fragments */ 973 fragnum = 0; 974 975 skb_queue_walk(&tx->skbs, skb) { 976 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 977 978 hdr = (void *)skb->data; 979 info = IEEE80211_SKB_CB(skb); 980 981 if (!skb_queue_is_last(&tx->skbs, skb)) { 982 hdr->frame_control |= morefrags; 983 /* 984 * No multi-rate retries for fragmented frames, that 985 * would completely throw off the NAV at other STAs. 986 */ 987 info->control.rates[1].idx = -1; 988 info->control.rates[2].idx = -1; 989 info->control.rates[3].idx = -1; 990 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 991 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 992 } else { 993 hdr->frame_control &= ~morefrags; 994 } 995 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 996 fragnum++; 997 } 998 999 return TX_CONTINUE; 1000 } 1001 1002 static ieee80211_tx_result debug_noinline 1003 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1004 { 1005 struct sk_buff *skb; 1006 int ac = -1; 1007 1008 if (!tx->sta) 1009 return TX_CONTINUE; 1010 1011 skb_queue_walk(&tx->skbs, skb) { 1012 ac = skb_get_queue_mapping(skb); 1013 tx->sta->tx_stats.bytes[ac] += skb->len; 1014 } 1015 if (ac >= 0) 1016 tx->sta->tx_stats.packets[ac]++; 1017 1018 return TX_CONTINUE; 1019 } 1020 1021 static ieee80211_tx_result debug_noinline 1022 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1023 { 1024 if (!tx->key) 1025 return TX_CONTINUE; 1026 1027 switch (tx->key->conf.cipher) { 1028 case WLAN_CIPHER_SUITE_WEP40: 1029 case WLAN_CIPHER_SUITE_WEP104: 1030 return ieee80211_crypto_wep_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_TKIP: 1032 return ieee80211_crypto_tkip_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_CCMP: 1034 return ieee80211_crypto_ccmp_encrypt( 1035 tx, IEEE80211_CCMP_MIC_LEN); 1036 case WLAN_CIPHER_SUITE_CCMP_256: 1037 return ieee80211_crypto_ccmp_encrypt( 1038 tx, IEEE80211_CCMP_256_MIC_LEN); 1039 case WLAN_CIPHER_SUITE_AES_CMAC: 1040 return ieee80211_crypto_aes_cmac_encrypt(tx); 1041 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1042 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1043 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1044 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1045 return ieee80211_crypto_aes_gmac_encrypt(tx); 1046 case WLAN_CIPHER_SUITE_GCMP: 1047 case WLAN_CIPHER_SUITE_GCMP_256: 1048 return ieee80211_crypto_gcmp_encrypt(tx); 1049 default: 1050 return ieee80211_crypto_hw_encrypt(tx); 1051 } 1052 1053 return TX_DROP; 1054 } 1055 1056 static ieee80211_tx_result debug_noinline 1057 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1058 { 1059 struct sk_buff *skb; 1060 struct ieee80211_hdr *hdr; 1061 int next_len; 1062 bool group_addr; 1063 1064 skb_queue_walk(&tx->skbs, skb) { 1065 hdr = (void *) skb->data; 1066 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1067 break; /* must not overwrite AID */ 1068 if (!skb_queue_is_last(&tx->skbs, skb)) { 1069 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1070 next_len = next->len; 1071 } else 1072 next_len = 0; 1073 group_addr = is_multicast_ether_addr(hdr->addr1); 1074 1075 hdr->duration_id = 1076 ieee80211_duration(tx, skb, group_addr, next_len); 1077 } 1078 1079 return TX_CONTINUE; 1080 } 1081 1082 /* actual transmit path */ 1083 1084 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1085 struct sk_buff *skb, 1086 struct ieee80211_tx_info *info, 1087 struct tid_ampdu_tx *tid_tx, 1088 int tid) 1089 { 1090 bool queued = false; 1091 bool reset_agg_timer = false; 1092 struct sk_buff *purge_skb = NULL; 1093 1094 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1095 info->flags |= IEEE80211_TX_CTL_AMPDU; 1096 reset_agg_timer = true; 1097 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1098 /* 1099 * nothing -- this aggregation session is being started 1100 * but that might still fail with the driver 1101 */ 1102 } else if (!tx->sta->sta.txq[tid]) { 1103 spin_lock(&tx->sta->lock); 1104 /* 1105 * Need to re-check now, because we may get here 1106 * 1107 * 1) in the window during which the setup is actually 1108 * already done, but not marked yet because not all 1109 * packets are spliced over to the driver pending 1110 * queue yet -- if this happened we acquire the lock 1111 * either before or after the splice happens, but 1112 * need to recheck which of these cases happened. 1113 * 1114 * 2) during session teardown, if the OPERATIONAL bit 1115 * was cleared due to the teardown but the pointer 1116 * hasn't been assigned NULL yet (or we loaded it 1117 * before it was assigned) -- in this case it may 1118 * now be NULL which means we should just let the 1119 * packet pass through because splicing the frames 1120 * back is already done. 1121 */ 1122 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1123 1124 if (!tid_tx) { 1125 /* do nothing, let packet pass through */ 1126 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1127 info->flags |= IEEE80211_TX_CTL_AMPDU; 1128 reset_agg_timer = true; 1129 } else { 1130 queued = true; 1131 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1132 clear_sta_flag(tx->sta, WLAN_STA_SP); 1133 ps_dbg(tx->sta->sdata, 1134 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1135 tx->sta->sta.addr, tx->sta->sta.aid); 1136 } 1137 info->control.vif = &tx->sdata->vif; 1138 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1139 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1140 __skb_queue_tail(&tid_tx->pending, skb); 1141 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1142 purge_skb = __skb_dequeue(&tid_tx->pending); 1143 } 1144 spin_unlock(&tx->sta->lock); 1145 1146 if (purge_skb) 1147 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1148 } 1149 1150 /* reset session timer */ 1151 if (reset_agg_timer) 1152 tid_tx->last_tx = jiffies; 1153 1154 return queued; 1155 } 1156 1157 /* 1158 * initialises @tx 1159 * pass %NULL for the station if unknown, a valid pointer if known 1160 * or an ERR_PTR() if the station is known not to exist 1161 */ 1162 static ieee80211_tx_result 1163 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1164 struct ieee80211_tx_data *tx, 1165 struct sta_info *sta, struct sk_buff *skb) 1166 { 1167 struct ieee80211_local *local = sdata->local; 1168 struct ieee80211_hdr *hdr; 1169 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1170 int tid; 1171 1172 memset(tx, 0, sizeof(*tx)); 1173 tx->skb = skb; 1174 tx->local = local; 1175 tx->sdata = sdata; 1176 __skb_queue_head_init(&tx->skbs); 1177 1178 /* 1179 * If this flag is set to true anywhere, and we get here, 1180 * we are doing the needed processing, so remove the flag 1181 * now. 1182 */ 1183 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1184 1185 hdr = (struct ieee80211_hdr *) skb->data; 1186 1187 if (likely(sta)) { 1188 if (!IS_ERR(sta)) 1189 tx->sta = sta; 1190 } else { 1191 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1192 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1193 if (!tx->sta && sdata->wdev.use_4addr) 1194 return TX_DROP; 1195 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1196 IEEE80211_TX_CTL_INJECTED) || 1197 tx->sdata->control_port_protocol == tx->skb->protocol) { 1198 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1199 } 1200 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1201 tx->sta = sta_info_get(sdata, hdr->addr1); 1202 } 1203 1204 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1205 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1206 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1207 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1208 struct tid_ampdu_tx *tid_tx; 1209 1210 tid = ieee80211_get_tid(hdr); 1211 1212 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1213 if (tid_tx) { 1214 bool queued; 1215 1216 queued = ieee80211_tx_prep_agg(tx, skb, info, 1217 tid_tx, tid); 1218 1219 if (unlikely(queued)) 1220 return TX_QUEUED; 1221 } 1222 } 1223 1224 if (is_multicast_ether_addr(hdr->addr1)) { 1225 tx->flags &= ~IEEE80211_TX_UNICAST; 1226 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1227 } else 1228 tx->flags |= IEEE80211_TX_UNICAST; 1229 1230 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1231 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1232 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1233 info->flags & IEEE80211_TX_CTL_AMPDU) 1234 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1235 } 1236 1237 if (!tx->sta) 1238 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1239 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1240 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1241 ieee80211_check_fast_xmit(tx->sta); 1242 } 1243 1244 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1245 1246 return TX_CONTINUE; 1247 } 1248 1249 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1250 struct ieee80211_vif *vif, 1251 struct sta_info *sta, 1252 struct sk_buff *skb) 1253 { 1254 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1255 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1256 struct ieee80211_txq *txq = NULL; 1257 1258 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1259 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1260 return NULL; 1261 1262 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1263 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1264 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1265 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1266 vif->type == NL80211_IFTYPE_STATION) && 1267 sta && sta->uploaded) { 1268 /* 1269 * This will be NULL if the driver didn't set the 1270 * opt-in hardware flag. 1271 */ 1272 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1273 } 1274 } else if (sta) { 1275 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1276 1277 if (!sta->uploaded) 1278 return NULL; 1279 1280 txq = sta->sta.txq[tid]; 1281 } else if (vif) { 1282 txq = vif->txq; 1283 } 1284 1285 if (!txq) 1286 return NULL; 1287 1288 return to_txq_info(txq); 1289 } 1290 1291 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1292 { 1293 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1294 } 1295 1296 static u32 codel_skb_len_func(const struct sk_buff *skb) 1297 { 1298 return skb->len; 1299 } 1300 1301 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1302 { 1303 const struct ieee80211_tx_info *info; 1304 1305 info = (const struct ieee80211_tx_info *)skb->cb; 1306 return info->control.enqueue_time; 1307 } 1308 1309 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1310 void *ctx) 1311 { 1312 struct ieee80211_local *local; 1313 struct txq_info *txqi; 1314 struct fq *fq; 1315 struct fq_flow *flow; 1316 1317 txqi = ctx; 1318 local = vif_to_sdata(txqi->txq.vif)->local; 1319 fq = &local->fq; 1320 1321 if (cvars == &txqi->def_cvars) 1322 flow = &txqi->def_flow; 1323 else 1324 flow = &fq->flows[cvars - local->cvars]; 1325 1326 return fq_flow_dequeue(fq, flow); 1327 } 1328 1329 static void codel_drop_func(struct sk_buff *skb, 1330 void *ctx) 1331 { 1332 struct ieee80211_local *local; 1333 struct ieee80211_hw *hw; 1334 struct txq_info *txqi; 1335 1336 txqi = ctx; 1337 local = vif_to_sdata(txqi->txq.vif)->local; 1338 hw = &local->hw; 1339 1340 ieee80211_free_txskb(hw, skb); 1341 } 1342 1343 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1344 struct fq_tin *tin, 1345 struct fq_flow *flow) 1346 { 1347 struct ieee80211_local *local; 1348 struct txq_info *txqi; 1349 struct codel_vars *cvars; 1350 struct codel_params *cparams; 1351 struct codel_stats *cstats; 1352 1353 local = container_of(fq, struct ieee80211_local, fq); 1354 txqi = container_of(tin, struct txq_info, tin); 1355 cstats = &txqi->cstats; 1356 1357 if (txqi->txq.sta) { 1358 struct sta_info *sta = container_of(txqi->txq.sta, 1359 struct sta_info, sta); 1360 cparams = &sta->cparams; 1361 } else { 1362 cparams = &local->cparams; 1363 } 1364 1365 if (flow == &txqi->def_flow) 1366 cvars = &txqi->def_cvars; 1367 else 1368 cvars = &local->cvars[flow - fq->flows]; 1369 1370 return codel_dequeue(txqi, 1371 &flow->backlog, 1372 cparams, 1373 cvars, 1374 cstats, 1375 codel_skb_len_func, 1376 codel_skb_time_func, 1377 codel_drop_func, 1378 codel_dequeue_func); 1379 } 1380 1381 static void fq_skb_free_func(struct fq *fq, 1382 struct fq_tin *tin, 1383 struct fq_flow *flow, 1384 struct sk_buff *skb) 1385 { 1386 struct ieee80211_local *local; 1387 1388 local = container_of(fq, struct ieee80211_local, fq); 1389 ieee80211_free_txskb(&local->hw, skb); 1390 } 1391 1392 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1393 struct fq_tin *tin, 1394 int idx, 1395 struct sk_buff *skb) 1396 { 1397 struct txq_info *txqi; 1398 1399 txqi = container_of(tin, struct txq_info, tin); 1400 return &txqi->def_flow; 1401 } 1402 1403 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1404 struct txq_info *txqi, 1405 struct sk_buff *skb) 1406 { 1407 struct fq *fq = &local->fq; 1408 struct fq_tin *tin = &txqi->tin; 1409 u32 flow_idx = fq_flow_idx(fq, skb); 1410 1411 ieee80211_set_skb_enqueue_time(skb); 1412 1413 spin_lock_bh(&fq->lock); 1414 fq_tin_enqueue(fq, tin, flow_idx, skb, 1415 fq_skb_free_func, 1416 fq_flow_get_default_func); 1417 spin_unlock_bh(&fq->lock); 1418 } 1419 1420 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1421 struct fq_flow *flow, struct sk_buff *skb, 1422 void *data) 1423 { 1424 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1425 1426 return info->control.vif == data; 1427 } 1428 1429 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1430 struct ieee80211_sub_if_data *sdata) 1431 { 1432 struct fq *fq = &local->fq; 1433 struct txq_info *txqi; 1434 struct fq_tin *tin; 1435 struct ieee80211_sub_if_data *ap; 1436 1437 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1438 return; 1439 1440 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1441 1442 if (!ap->vif.txq) 1443 return; 1444 1445 txqi = to_txq_info(ap->vif.txq); 1446 tin = &txqi->tin; 1447 1448 spin_lock_bh(&fq->lock); 1449 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1450 fq_skb_free_func); 1451 spin_unlock_bh(&fq->lock); 1452 } 1453 1454 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1455 struct sta_info *sta, 1456 struct txq_info *txqi, int tid) 1457 { 1458 fq_tin_init(&txqi->tin); 1459 fq_flow_init(&txqi->def_flow); 1460 codel_vars_init(&txqi->def_cvars); 1461 codel_stats_init(&txqi->cstats); 1462 __skb_queue_head_init(&txqi->frags); 1463 INIT_LIST_HEAD(&txqi->schedule_order); 1464 1465 txqi->txq.vif = &sdata->vif; 1466 1467 if (!sta) { 1468 sdata->vif.txq = &txqi->txq; 1469 txqi->txq.tid = 0; 1470 txqi->txq.ac = IEEE80211_AC_BE; 1471 1472 return; 1473 } 1474 1475 if (tid == IEEE80211_NUM_TIDS) { 1476 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1477 /* Drivers need to opt in to the management MPDU TXQ */ 1478 if (!ieee80211_hw_check(&sdata->local->hw, 1479 STA_MMPDU_TXQ)) 1480 return; 1481 } else if (!ieee80211_hw_check(&sdata->local->hw, 1482 BUFF_MMPDU_TXQ)) { 1483 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1484 return; 1485 } 1486 txqi->txq.ac = IEEE80211_AC_VO; 1487 } else { 1488 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1489 } 1490 1491 txqi->txq.sta = &sta->sta; 1492 txqi->txq.tid = tid; 1493 sta->sta.txq[tid] = &txqi->txq; 1494 } 1495 1496 void ieee80211_txq_purge(struct ieee80211_local *local, 1497 struct txq_info *txqi) 1498 { 1499 struct fq *fq = &local->fq; 1500 struct fq_tin *tin = &txqi->tin; 1501 1502 spin_lock_bh(&fq->lock); 1503 fq_tin_reset(fq, tin, fq_skb_free_func); 1504 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1505 spin_unlock_bh(&fq->lock); 1506 1507 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1508 list_del_init(&txqi->schedule_order); 1509 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1510 } 1511 1512 void ieee80211_txq_set_params(struct ieee80211_local *local) 1513 { 1514 if (local->hw.wiphy->txq_limit) 1515 local->fq.limit = local->hw.wiphy->txq_limit; 1516 else 1517 local->hw.wiphy->txq_limit = local->fq.limit; 1518 1519 if (local->hw.wiphy->txq_memory_limit) 1520 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1521 else 1522 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1523 1524 if (local->hw.wiphy->txq_quantum) 1525 local->fq.quantum = local->hw.wiphy->txq_quantum; 1526 else 1527 local->hw.wiphy->txq_quantum = local->fq.quantum; 1528 } 1529 1530 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1531 { 1532 struct fq *fq = &local->fq; 1533 int ret; 1534 int i; 1535 bool supp_vht = false; 1536 enum nl80211_band band; 1537 1538 if (!local->ops->wake_tx_queue) 1539 return 0; 1540 1541 ret = fq_init(fq, 4096); 1542 if (ret) 1543 return ret; 1544 1545 /* 1546 * If the hardware doesn't support VHT, it is safe to limit the maximum 1547 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1548 */ 1549 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1550 struct ieee80211_supported_band *sband; 1551 1552 sband = local->hw.wiphy->bands[band]; 1553 if (!sband) 1554 continue; 1555 1556 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1557 } 1558 1559 if (!supp_vht) 1560 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1561 1562 codel_params_init(&local->cparams); 1563 local->cparams.interval = MS2TIME(100); 1564 local->cparams.target = MS2TIME(20); 1565 local->cparams.ecn = true; 1566 1567 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1568 GFP_KERNEL); 1569 if (!local->cvars) { 1570 spin_lock_bh(&fq->lock); 1571 fq_reset(fq, fq_skb_free_func); 1572 spin_unlock_bh(&fq->lock); 1573 return -ENOMEM; 1574 } 1575 1576 for (i = 0; i < fq->flows_cnt; i++) 1577 codel_vars_init(&local->cvars[i]); 1578 1579 ieee80211_txq_set_params(local); 1580 1581 return 0; 1582 } 1583 1584 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1585 { 1586 struct fq *fq = &local->fq; 1587 1588 if (!local->ops->wake_tx_queue) 1589 return; 1590 1591 kfree(local->cvars); 1592 local->cvars = NULL; 1593 1594 spin_lock_bh(&fq->lock); 1595 fq_reset(fq, fq_skb_free_func); 1596 spin_unlock_bh(&fq->lock); 1597 } 1598 1599 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1600 struct ieee80211_sub_if_data *sdata, 1601 struct sta_info *sta, 1602 struct sk_buff *skb) 1603 { 1604 struct ieee80211_vif *vif; 1605 struct txq_info *txqi; 1606 1607 if (!local->ops->wake_tx_queue || 1608 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1609 return false; 1610 1611 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1612 sdata = container_of(sdata->bss, 1613 struct ieee80211_sub_if_data, u.ap); 1614 1615 vif = &sdata->vif; 1616 txqi = ieee80211_get_txq(local, vif, sta, skb); 1617 1618 if (!txqi) 1619 return false; 1620 1621 ieee80211_txq_enqueue(local, txqi, skb); 1622 1623 schedule_and_wake_txq(local, txqi); 1624 1625 return true; 1626 } 1627 1628 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1629 struct ieee80211_vif *vif, 1630 struct sta_info *sta, 1631 struct sk_buff_head *skbs, 1632 bool txpending) 1633 { 1634 struct ieee80211_tx_control control = {}; 1635 struct sk_buff *skb, *tmp; 1636 unsigned long flags; 1637 1638 skb_queue_walk_safe(skbs, skb, tmp) { 1639 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1640 int q = info->hw_queue; 1641 1642 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1643 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1644 __skb_unlink(skb, skbs); 1645 ieee80211_free_txskb(&local->hw, skb); 1646 continue; 1647 } 1648 #endif 1649 1650 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1651 if (local->queue_stop_reasons[q] || 1652 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1653 if (unlikely(info->flags & 1654 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1655 if (local->queue_stop_reasons[q] & 1656 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1657 /* 1658 * Drop off-channel frames if queues 1659 * are stopped for any reason other 1660 * than off-channel operation. Never 1661 * queue them. 1662 */ 1663 spin_unlock_irqrestore( 1664 &local->queue_stop_reason_lock, 1665 flags); 1666 ieee80211_purge_tx_queue(&local->hw, 1667 skbs); 1668 return true; 1669 } 1670 } else { 1671 1672 /* 1673 * Since queue is stopped, queue up frames for 1674 * later transmission from the tx-pending 1675 * tasklet when the queue is woken again. 1676 */ 1677 if (txpending) 1678 skb_queue_splice_init(skbs, 1679 &local->pending[q]); 1680 else 1681 skb_queue_splice_tail_init(skbs, 1682 &local->pending[q]); 1683 1684 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1685 flags); 1686 return false; 1687 } 1688 } 1689 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1690 1691 info->control.vif = vif; 1692 control.sta = sta ? &sta->sta : NULL; 1693 1694 __skb_unlink(skb, skbs); 1695 drv_tx(local, &control, skb); 1696 } 1697 1698 return true; 1699 } 1700 1701 /* 1702 * Returns false if the frame couldn't be transmitted but was queued instead. 1703 */ 1704 static bool __ieee80211_tx(struct ieee80211_local *local, 1705 struct sk_buff_head *skbs, int led_len, 1706 struct sta_info *sta, bool txpending) 1707 { 1708 struct ieee80211_tx_info *info; 1709 struct ieee80211_sub_if_data *sdata; 1710 struct ieee80211_vif *vif; 1711 struct sk_buff *skb; 1712 bool result = true; 1713 __le16 fc; 1714 1715 if (WARN_ON(skb_queue_empty(skbs))) 1716 return true; 1717 1718 skb = skb_peek(skbs); 1719 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1720 info = IEEE80211_SKB_CB(skb); 1721 sdata = vif_to_sdata(info->control.vif); 1722 if (sta && !sta->uploaded) 1723 sta = NULL; 1724 1725 switch (sdata->vif.type) { 1726 case NL80211_IFTYPE_MONITOR: 1727 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1728 vif = &sdata->vif; 1729 break; 1730 } 1731 sdata = rcu_dereference(local->monitor_sdata); 1732 if (sdata) { 1733 vif = &sdata->vif; 1734 info->hw_queue = 1735 vif->hw_queue[skb_get_queue_mapping(skb)]; 1736 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1737 ieee80211_purge_tx_queue(&local->hw, skbs); 1738 return true; 1739 } else 1740 vif = NULL; 1741 break; 1742 case NL80211_IFTYPE_AP_VLAN: 1743 sdata = container_of(sdata->bss, 1744 struct ieee80211_sub_if_data, u.ap); 1745 fallthrough; 1746 default: 1747 vif = &sdata->vif; 1748 break; 1749 } 1750 1751 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1752 1753 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1754 1755 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1756 1757 return result; 1758 } 1759 1760 /* 1761 * Invoke TX handlers, return 0 on success and non-zero if the 1762 * frame was dropped or queued. 1763 * 1764 * The handlers are split into an early and late part. The latter is everything 1765 * that can be sensitive to reordering, and will be deferred to after packets 1766 * are dequeued from the intermediate queues (when they are enabled). 1767 */ 1768 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1769 { 1770 ieee80211_tx_result res = TX_DROP; 1771 1772 #define CALL_TXH(txh) \ 1773 do { \ 1774 res = txh(tx); \ 1775 if (res != TX_CONTINUE) \ 1776 goto txh_done; \ 1777 } while (0) 1778 1779 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1780 CALL_TXH(ieee80211_tx_h_check_assoc); 1781 CALL_TXH(ieee80211_tx_h_ps_buf); 1782 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1783 CALL_TXH(ieee80211_tx_h_select_key); 1784 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1785 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1786 1787 txh_done: 1788 if (unlikely(res == TX_DROP)) { 1789 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1790 if (tx->skb) 1791 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1792 else 1793 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1794 return -1; 1795 } else if (unlikely(res == TX_QUEUED)) { 1796 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1797 return -1; 1798 } 1799 1800 return 0; 1801 } 1802 1803 /* 1804 * Late handlers can be called while the sta lock is held. Handlers that can 1805 * cause packets to be generated will cause deadlock! 1806 */ 1807 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1808 { 1809 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1810 ieee80211_tx_result res = TX_CONTINUE; 1811 1812 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1813 __skb_queue_tail(&tx->skbs, tx->skb); 1814 tx->skb = NULL; 1815 goto txh_done; 1816 } 1817 1818 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1819 CALL_TXH(ieee80211_tx_h_sequence); 1820 CALL_TXH(ieee80211_tx_h_fragment); 1821 /* handlers after fragment must be aware of tx info fragmentation! */ 1822 CALL_TXH(ieee80211_tx_h_stats); 1823 CALL_TXH(ieee80211_tx_h_encrypt); 1824 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1825 CALL_TXH(ieee80211_tx_h_calculate_duration); 1826 #undef CALL_TXH 1827 1828 txh_done: 1829 if (unlikely(res == TX_DROP)) { 1830 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1831 if (tx->skb) 1832 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1833 else 1834 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1835 return -1; 1836 } else if (unlikely(res == TX_QUEUED)) { 1837 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1838 return -1; 1839 } 1840 1841 return 0; 1842 } 1843 1844 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1845 { 1846 int r = invoke_tx_handlers_early(tx); 1847 1848 if (r) 1849 return r; 1850 return invoke_tx_handlers_late(tx); 1851 } 1852 1853 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1854 struct ieee80211_vif *vif, struct sk_buff *skb, 1855 int band, struct ieee80211_sta **sta) 1856 { 1857 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1858 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1859 struct ieee80211_tx_data tx; 1860 struct sk_buff *skb2; 1861 1862 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1863 return false; 1864 1865 info->band = band; 1866 info->control.vif = vif; 1867 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1868 1869 if (invoke_tx_handlers(&tx)) 1870 return false; 1871 1872 if (sta) { 1873 if (tx.sta) 1874 *sta = &tx.sta->sta; 1875 else 1876 *sta = NULL; 1877 } 1878 1879 /* this function isn't suitable for fragmented data frames */ 1880 skb2 = __skb_dequeue(&tx.skbs); 1881 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1882 ieee80211_free_txskb(hw, skb2); 1883 ieee80211_purge_tx_queue(hw, &tx.skbs); 1884 return false; 1885 } 1886 1887 return true; 1888 } 1889 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1890 1891 /* 1892 * Returns false if the frame couldn't be transmitted but was queued instead. 1893 */ 1894 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1895 struct sta_info *sta, struct sk_buff *skb, 1896 bool txpending) 1897 { 1898 struct ieee80211_local *local = sdata->local; 1899 struct ieee80211_tx_data tx; 1900 ieee80211_tx_result res_prepare; 1901 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1902 bool result = true; 1903 int led_len; 1904 1905 if (unlikely(skb->len < 10)) { 1906 dev_kfree_skb(skb); 1907 return true; 1908 } 1909 1910 /* initialises tx */ 1911 led_len = skb->len; 1912 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1913 1914 if (unlikely(res_prepare == TX_DROP)) { 1915 ieee80211_free_txskb(&local->hw, skb); 1916 return true; 1917 } else if (unlikely(res_prepare == TX_QUEUED)) { 1918 return true; 1919 } 1920 1921 /* set up hw_queue value early */ 1922 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1923 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1924 info->hw_queue = 1925 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1926 1927 if (invoke_tx_handlers_early(&tx)) 1928 return true; 1929 1930 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1931 return true; 1932 1933 if (!invoke_tx_handlers_late(&tx)) 1934 result = __ieee80211_tx(local, &tx.skbs, led_len, 1935 tx.sta, txpending); 1936 1937 return result; 1938 } 1939 1940 /* device xmit handlers */ 1941 1942 enum ieee80211_encrypt { 1943 ENCRYPT_NO, 1944 ENCRYPT_MGMT, 1945 ENCRYPT_DATA, 1946 }; 1947 1948 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1949 struct sk_buff *skb, 1950 int head_need, 1951 enum ieee80211_encrypt encrypt) 1952 { 1953 struct ieee80211_local *local = sdata->local; 1954 bool enc_tailroom; 1955 int tail_need = 0; 1956 1957 enc_tailroom = encrypt == ENCRYPT_MGMT || 1958 (encrypt == ENCRYPT_DATA && 1959 sdata->crypto_tx_tailroom_needed_cnt); 1960 1961 if (enc_tailroom) { 1962 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1963 tail_need -= skb_tailroom(skb); 1964 tail_need = max_t(int, tail_need, 0); 1965 } 1966 1967 if (skb_cloned(skb) && 1968 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1969 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1970 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1971 else if (head_need || tail_need) 1972 I802_DEBUG_INC(local->tx_expand_skb_head); 1973 else 1974 return 0; 1975 1976 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1977 wiphy_debug(local->hw.wiphy, 1978 "failed to reallocate TX buffer\n"); 1979 return -ENOMEM; 1980 } 1981 1982 return 0; 1983 } 1984 1985 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1986 struct sta_info *sta, struct sk_buff *skb) 1987 { 1988 struct ieee80211_local *local = sdata->local; 1989 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1990 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1991 int headroom; 1992 enum ieee80211_encrypt encrypt; 1993 1994 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 1995 encrypt = ENCRYPT_NO; 1996 else if (ieee80211_is_mgmt(hdr->frame_control)) 1997 encrypt = ENCRYPT_MGMT; 1998 else 1999 encrypt = ENCRYPT_DATA; 2000 2001 headroom = local->tx_headroom; 2002 if (encrypt != ENCRYPT_NO) 2003 headroom += sdata->encrypt_headroom; 2004 headroom -= skb_headroom(skb); 2005 headroom = max_t(int, 0, headroom); 2006 2007 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2008 ieee80211_free_txskb(&local->hw, skb); 2009 return; 2010 } 2011 2012 /* reload after potential resize */ 2013 hdr = (struct ieee80211_hdr *) skb->data; 2014 info->control.vif = &sdata->vif; 2015 2016 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2017 if (ieee80211_is_data(hdr->frame_control) && 2018 is_unicast_ether_addr(hdr->addr1)) { 2019 if (mesh_nexthop_resolve(sdata, skb)) 2020 return; /* skb queued: don't free */ 2021 } else { 2022 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2023 } 2024 } 2025 2026 ieee80211_set_qos_hdr(sdata, skb); 2027 ieee80211_tx(sdata, sta, skb, false); 2028 } 2029 2030 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2031 struct net_device *dev) 2032 { 2033 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2034 struct ieee80211_radiotap_iterator iterator; 2035 struct ieee80211_radiotap_header *rthdr = 2036 (struct ieee80211_radiotap_header *) skb->data; 2037 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2038 struct ieee80211_supported_band *sband = 2039 local->hw.wiphy->bands[info->band]; 2040 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2041 NULL); 2042 u16 txflags; 2043 u16 rate = 0; 2044 bool rate_found = false; 2045 u8 rate_retries = 0; 2046 u16 rate_flags = 0; 2047 u8 mcs_known, mcs_flags, mcs_bw; 2048 u16 vht_known; 2049 u8 vht_mcs = 0, vht_nss = 0; 2050 int i; 2051 2052 /* check for not even having the fixed radiotap header part */ 2053 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2054 return false; /* too short to be possibly valid */ 2055 2056 /* is it a header version we can trust to find length from? */ 2057 if (unlikely(rthdr->it_version)) 2058 return false; /* only version 0 is supported */ 2059 2060 /* does the skb contain enough to deliver on the alleged length? */ 2061 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2062 return false; /* skb too short for claimed rt header extent */ 2063 2064 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2065 IEEE80211_TX_CTL_DONTFRAG; 2066 2067 /* 2068 * for every radiotap entry that is present 2069 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2070 * entries present, or -EINVAL on error) 2071 */ 2072 2073 while (!ret) { 2074 ret = ieee80211_radiotap_iterator_next(&iterator); 2075 2076 if (ret) 2077 continue; 2078 2079 /* see if this argument is something we can use */ 2080 switch (iterator.this_arg_index) { 2081 /* 2082 * You must take care when dereferencing iterator.this_arg 2083 * for multibyte types... the pointer is not aligned. Use 2084 * get_unaligned((type *)iterator.this_arg) to dereference 2085 * iterator.this_arg for type "type" safely on all arches. 2086 */ 2087 case IEEE80211_RADIOTAP_FLAGS: 2088 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2089 /* 2090 * this indicates that the skb we have been 2091 * handed has the 32-bit FCS CRC at the end... 2092 * we should react to that by snipping it off 2093 * because it will be recomputed and added 2094 * on transmission 2095 */ 2096 if (skb->len < (iterator._max_length + FCS_LEN)) 2097 return false; 2098 2099 skb_trim(skb, skb->len - FCS_LEN); 2100 } 2101 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2102 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2103 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2104 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2105 break; 2106 2107 case IEEE80211_RADIOTAP_TX_FLAGS: 2108 txflags = get_unaligned_le16(iterator.this_arg); 2109 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2110 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2111 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2112 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2113 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2114 info->control.flags |= 2115 IEEE80211_TX_CTRL_DONT_REORDER; 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 /* Initialize skb->priority for QoS frames. If the DONT_REORDER flag 2283 * is set, stick to the default value for skb->priority to assure 2284 * frames injected with this flag are not reordered relative to each 2285 * other. 2286 */ 2287 if (ieee80211_is_data_qos(hdr->frame_control) && 2288 !(info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER)) { 2289 u8 *p = ieee80211_get_qos_ctl(hdr); 2290 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 2291 } 2292 2293 rcu_read_lock(); 2294 2295 /* 2296 * We process outgoing injected frames that have a local address 2297 * we handle as though they are non-injected frames. 2298 * This code here isn't entirely correct, the local MAC address 2299 * isn't always enough to find the interface to use; for proper 2300 * VLAN support we have an nl80211-based mechanism. 2301 * 2302 * This is necessary, for example, for old hostapd versions that 2303 * don't use nl80211-based management TX/RX. 2304 */ 2305 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2306 2307 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2308 if (!ieee80211_sdata_running(tmp_sdata)) 2309 continue; 2310 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2311 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 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 #ifdef CONFIG_MAC80211_MESH 2406 case NL80211_IFTYPE_MESH_POINT: 2407 /* determined much later */ 2408 *sta_out = NULL; 2409 return 0; 2410 #endif 2411 case NL80211_IFTYPE_STATION: 2412 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2413 sta = sta_info_get(sdata, skb->data); 2414 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2415 if (test_sta_flag(sta, 2416 WLAN_STA_TDLS_PEER_AUTH)) { 2417 *sta_out = sta; 2418 return 0; 2419 } 2420 2421 /* 2422 * TDLS link during setup - throw out frames to 2423 * peer. Allow TDLS-setup frames to unauthorized 2424 * peers for the special case of a link teardown 2425 * after a TDLS sta is removed due to being 2426 * unreachable. 2427 */ 2428 if (!ieee80211_is_tdls_setup(skb)) 2429 return -EINVAL; 2430 } 2431 2432 } 2433 2434 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2435 if (!sta) 2436 return -ENOLINK; 2437 break; 2438 default: 2439 return -EINVAL; 2440 } 2441 2442 *sta_out = sta ?: ERR_PTR(-ENOENT); 2443 return 0; 2444 } 2445 2446 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2447 struct sk_buff *skb, 2448 u32 *info_flags, 2449 u64 *cookie) 2450 { 2451 struct sk_buff *ack_skb; 2452 u16 info_id = 0; 2453 2454 if (skb->sk) 2455 ack_skb = skb_clone_sk(skb); 2456 else 2457 ack_skb = skb_clone(skb, GFP_ATOMIC); 2458 2459 if (ack_skb) { 2460 unsigned long flags; 2461 int id; 2462 2463 spin_lock_irqsave(&local->ack_status_lock, flags); 2464 id = idr_alloc(&local->ack_status_frames, ack_skb, 2465 1, 0x2000, GFP_ATOMIC); 2466 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2467 2468 if (id >= 0) { 2469 info_id = id; 2470 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2471 if (cookie) { 2472 *cookie = ieee80211_mgmt_tx_cookie(local); 2473 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2474 } 2475 } else { 2476 kfree_skb(ack_skb); 2477 } 2478 } 2479 2480 return info_id; 2481 } 2482 2483 /** 2484 * ieee80211_build_hdr - build 802.11 header in the given frame 2485 * @sdata: virtual interface to build the header for 2486 * @skb: the skb to build the header in 2487 * @info_flags: skb flags to set 2488 * @sta: the station pointer 2489 * @ctrl_flags: info control flags to set 2490 * @cookie: cookie pointer to fill (if not %NULL) 2491 * 2492 * This function takes the skb with 802.3 header and reformats the header to 2493 * the appropriate IEEE 802.11 header based on which interface the packet is 2494 * being transmitted on. 2495 * 2496 * Note that this function also takes care of the TX status request and 2497 * potential unsharing of the SKB - this needs to be interleaved with the 2498 * header building. 2499 * 2500 * The function requires the read-side RCU lock held 2501 * 2502 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2503 */ 2504 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2505 struct sk_buff *skb, u32 info_flags, 2506 struct sta_info *sta, u32 ctrl_flags, 2507 u64 *cookie) 2508 { 2509 struct ieee80211_local *local = sdata->local; 2510 struct ieee80211_tx_info *info; 2511 int head_need; 2512 u16 ethertype, hdrlen, meshhdrlen = 0; 2513 __le16 fc; 2514 struct ieee80211_hdr hdr; 2515 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2516 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2517 const u8 *encaps_data; 2518 int encaps_len, skip_header_bytes; 2519 bool wme_sta = false, authorized = false; 2520 bool tdls_peer; 2521 bool multicast; 2522 u16 info_id = 0; 2523 struct ieee80211_chanctx_conf *chanctx_conf; 2524 struct ieee80211_sub_if_data *ap_sdata; 2525 enum nl80211_band band; 2526 int ret; 2527 2528 if (IS_ERR(sta)) 2529 sta = NULL; 2530 2531 #ifdef CONFIG_MAC80211_DEBUGFS 2532 if (local->force_tx_status) 2533 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2534 #endif 2535 2536 /* convert Ethernet header to proper 802.11 header (based on 2537 * operation mode) */ 2538 ethertype = (skb->data[12] << 8) | skb->data[13]; 2539 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2540 2541 switch (sdata->vif.type) { 2542 case NL80211_IFTYPE_AP_VLAN: 2543 if (sdata->wdev.use_4addr) { 2544 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2545 /* RA TA DA SA */ 2546 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2547 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2548 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2549 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2550 hdrlen = 30; 2551 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2552 wme_sta = sta->sta.wme; 2553 } 2554 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2555 u.ap); 2556 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2557 if (!chanctx_conf) { 2558 ret = -ENOTCONN; 2559 goto free; 2560 } 2561 band = chanctx_conf->def.chan->band; 2562 if (sdata->wdev.use_4addr) 2563 break; 2564 fallthrough; 2565 case NL80211_IFTYPE_AP: 2566 if (sdata->vif.type == NL80211_IFTYPE_AP) 2567 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2568 if (!chanctx_conf) { 2569 ret = -ENOTCONN; 2570 goto free; 2571 } 2572 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2573 /* DA BSSID SA */ 2574 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2575 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2576 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2577 hdrlen = 24; 2578 band = chanctx_conf->def.chan->band; 2579 break; 2580 #ifdef CONFIG_MAC80211_MESH 2581 case NL80211_IFTYPE_MESH_POINT: 2582 if (!is_multicast_ether_addr(skb->data)) { 2583 struct sta_info *next_hop; 2584 bool mpp_lookup = true; 2585 2586 mpath = mesh_path_lookup(sdata, skb->data); 2587 if (mpath) { 2588 mpp_lookup = false; 2589 next_hop = rcu_dereference(mpath->next_hop); 2590 if (!next_hop || 2591 !(mpath->flags & (MESH_PATH_ACTIVE | 2592 MESH_PATH_RESOLVING))) 2593 mpp_lookup = true; 2594 } 2595 2596 if (mpp_lookup) { 2597 mppath = mpp_path_lookup(sdata, skb->data); 2598 if (mppath) 2599 mppath->exp_time = jiffies; 2600 } 2601 2602 if (mppath && mpath) 2603 mesh_path_del(sdata, mpath->dst); 2604 } 2605 2606 /* 2607 * Use address extension if it is a packet from 2608 * another interface or if we know the destination 2609 * is being proxied by a portal (i.e. portal address 2610 * differs from proxied address) 2611 */ 2612 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2613 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2614 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2615 skb->data, skb->data + ETH_ALEN); 2616 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2617 NULL, NULL); 2618 } else { 2619 /* DS -> MBSS (802.11-2012 13.11.3.3). 2620 * For unicast with unknown forwarding information, 2621 * destination might be in the MBSS or if that fails 2622 * forwarded to another mesh gate. In either case 2623 * resolution will be handled in ieee80211_xmit(), so 2624 * leave the original DA. This also works for mcast */ 2625 const u8 *mesh_da = skb->data; 2626 2627 if (mppath) 2628 mesh_da = mppath->mpp; 2629 else if (mpath) 2630 mesh_da = mpath->dst; 2631 2632 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2633 mesh_da, sdata->vif.addr); 2634 if (is_multicast_ether_addr(mesh_da)) 2635 /* DA TA mSA AE:SA */ 2636 meshhdrlen = ieee80211_new_mesh_header( 2637 sdata, &mesh_hdr, 2638 skb->data + ETH_ALEN, NULL); 2639 else 2640 /* RA TA mDA mSA AE:DA SA */ 2641 meshhdrlen = ieee80211_new_mesh_header( 2642 sdata, &mesh_hdr, skb->data, 2643 skb->data + ETH_ALEN); 2644 2645 } 2646 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2647 if (!chanctx_conf) { 2648 ret = -ENOTCONN; 2649 goto free; 2650 } 2651 band = chanctx_conf->def.chan->band; 2652 2653 /* For injected frames, fill RA right away as nexthop lookup 2654 * will be skipped. 2655 */ 2656 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2657 is_zero_ether_addr(hdr.addr1)) 2658 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2659 break; 2660 #endif 2661 case NL80211_IFTYPE_STATION: 2662 /* we already did checks when looking up the RA STA */ 2663 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2664 2665 if (tdls_peer) { 2666 /* DA SA BSSID */ 2667 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2668 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2669 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2670 hdrlen = 24; 2671 } else if (sdata->u.mgd.use_4addr && 2672 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2673 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2674 IEEE80211_FCTL_TODS); 2675 /* RA TA DA SA */ 2676 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2677 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2678 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2679 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2680 hdrlen = 30; 2681 } else { 2682 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2683 /* BSSID SA DA */ 2684 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2685 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2686 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2687 hdrlen = 24; 2688 } 2689 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2690 if (!chanctx_conf) { 2691 ret = -ENOTCONN; 2692 goto free; 2693 } 2694 band = chanctx_conf->def.chan->band; 2695 break; 2696 case NL80211_IFTYPE_OCB: 2697 /* DA SA BSSID */ 2698 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2699 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2700 eth_broadcast_addr(hdr.addr3); 2701 hdrlen = 24; 2702 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2703 if (!chanctx_conf) { 2704 ret = -ENOTCONN; 2705 goto free; 2706 } 2707 band = chanctx_conf->def.chan->band; 2708 break; 2709 case NL80211_IFTYPE_ADHOC: 2710 /* DA SA BSSID */ 2711 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2712 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2713 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2714 hdrlen = 24; 2715 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2716 if (!chanctx_conf) { 2717 ret = -ENOTCONN; 2718 goto free; 2719 } 2720 band = chanctx_conf->def.chan->band; 2721 break; 2722 default: 2723 ret = -EINVAL; 2724 goto free; 2725 } 2726 2727 multicast = is_multicast_ether_addr(hdr.addr1); 2728 2729 /* sta is always NULL for mesh */ 2730 if (sta) { 2731 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2732 wme_sta = sta->sta.wme; 2733 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2734 /* For mesh, the use of the QoS header is mandatory */ 2735 wme_sta = true; 2736 } 2737 2738 /* receiver does QoS (which also means we do) use it */ 2739 if (wme_sta) { 2740 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2741 hdrlen += 2; 2742 } 2743 2744 /* 2745 * Drop unicast frames to unauthorised stations unless they are 2746 * EAPOL frames from the local station. 2747 */ 2748 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2749 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2750 !multicast && !authorized && 2751 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2752 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2753 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2754 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2755 sdata->name, hdr.addr1); 2756 #endif 2757 2758 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2759 2760 ret = -EPERM; 2761 goto free; 2762 } 2763 2764 if (unlikely(!multicast && ((skb->sk && 2765 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2766 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2767 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2768 cookie); 2769 2770 /* 2771 * If the skb is shared we need to obtain our own copy. 2772 */ 2773 if (skb_shared(skb)) { 2774 struct sk_buff *tmp_skb = skb; 2775 2776 /* can't happen -- skb is a clone if info_id != 0 */ 2777 WARN_ON(info_id); 2778 2779 skb = skb_clone(skb, GFP_ATOMIC); 2780 kfree_skb(tmp_skb); 2781 2782 if (!skb) { 2783 ret = -ENOMEM; 2784 goto free; 2785 } 2786 } 2787 2788 hdr.frame_control = fc; 2789 hdr.duration_id = 0; 2790 hdr.seq_ctrl = 0; 2791 2792 skip_header_bytes = ETH_HLEN; 2793 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2794 encaps_data = bridge_tunnel_header; 2795 encaps_len = sizeof(bridge_tunnel_header); 2796 skip_header_bytes -= 2; 2797 } else if (ethertype >= ETH_P_802_3_MIN) { 2798 encaps_data = rfc1042_header; 2799 encaps_len = sizeof(rfc1042_header); 2800 skip_header_bytes -= 2; 2801 } else { 2802 encaps_data = NULL; 2803 encaps_len = 0; 2804 } 2805 2806 skb_pull(skb, skip_header_bytes); 2807 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2808 2809 /* 2810 * So we need to modify the skb header and hence need a copy of 2811 * that. The head_need variable above doesn't, so far, include 2812 * the needed header space that we don't need right away. If we 2813 * can, then we don't reallocate right now but only after the 2814 * frame arrives at the master device (if it does...) 2815 * 2816 * If we cannot, however, then we will reallocate to include all 2817 * the ever needed space. Also, if we need to reallocate it anyway, 2818 * make it big enough for everything we may ever need. 2819 */ 2820 2821 if (head_need > 0 || skb_cloned(skb)) { 2822 head_need += sdata->encrypt_headroom; 2823 head_need += local->tx_headroom; 2824 head_need = max_t(int, 0, head_need); 2825 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2826 ieee80211_free_txskb(&local->hw, skb); 2827 skb = NULL; 2828 return ERR_PTR(-ENOMEM); 2829 } 2830 } 2831 2832 if (encaps_data) 2833 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2834 2835 #ifdef CONFIG_MAC80211_MESH 2836 if (meshhdrlen > 0) 2837 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2838 #endif 2839 2840 if (ieee80211_is_data_qos(fc)) { 2841 __le16 *qos_control; 2842 2843 qos_control = skb_push(skb, 2); 2844 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2845 /* 2846 * Maybe we could actually set some fields here, for now just 2847 * initialise to zero to indicate no special operation. 2848 */ 2849 *qos_control = 0; 2850 } else 2851 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2852 2853 skb_reset_mac_header(skb); 2854 2855 info = IEEE80211_SKB_CB(skb); 2856 memset(info, 0, sizeof(*info)); 2857 2858 info->flags = info_flags; 2859 info->ack_frame_id = info_id; 2860 info->band = band; 2861 info->control.flags = ctrl_flags; 2862 2863 return skb; 2864 free: 2865 kfree_skb(skb); 2866 return ERR_PTR(ret); 2867 } 2868 2869 /* 2870 * fast-xmit overview 2871 * 2872 * The core idea of this fast-xmit is to remove per-packet checks by checking 2873 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2874 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2875 * much less work can be done per packet. For example, fragmentation must be 2876 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2877 * in the code here. 2878 * 2879 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2880 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2881 * 2882 * The most difficult part of this is that when any of these assumptions 2883 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2884 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2885 * since the per-packet code no longer checks the conditions. This is reflected 2886 * by the calls to these functions throughout the rest of the code, and must be 2887 * maintained if any of the TX path checks change. 2888 */ 2889 2890 void ieee80211_check_fast_xmit(struct sta_info *sta) 2891 { 2892 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2893 struct ieee80211_local *local = sta->local; 2894 struct ieee80211_sub_if_data *sdata = sta->sdata; 2895 struct ieee80211_hdr *hdr = (void *)build.hdr; 2896 struct ieee80211_chanctx_conf *chanctx_conf; 2897 __le16 fc; 2898 2899 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2900 return; 2901 2902 /* Locking here protects both the pointer itself, and against concurrent 2903 * invocations winning data access races to, e.g., the key pointer that 2904 * is used. 2905 * Without it, the invocation of this function right after the key 2906 * pointer changes wouldn't be sufficient, as another CPU could access 2907 * the pointer, then stall, and then do the cache update after the CPU 2908 * that invalidated the key. 2909 * With the locking, such scenarios cannot happen as the check for the 2910 * key and the fast-tx assignment are done atomically, so the CPU that 2911 * modifies the key will either wait or other one will see the key 2912 * cleared/changed already. 2913 */ 2914 spin_lock_bh(&sta->lock); 2915 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2916 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2917 sdata->vif.type == NL80211_IFTYPE_STATION) 2918 goto out; 2919 2920 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2921 goto out; 2922 2923 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2924 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2925 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2926 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2927 goto out; 2928 2929 if (sdata->noack_map) 2930 goto out; 2931 2932 /* fast-xmit doesn't handle fragmentation at all */ 2933 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2934 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2935 goto out; 2936 2937 rcu_read_lock(); 2938 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2939 if (!chanctx_conf) { 2940 rcu_read_unlock(); 2941 goto out; 2942 } 2943 build.band = chanctx_conf->def.chan->band; 2944 rcu_read_unlock(); 2945 2946 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2947 2948 switch (sdata->vif.type) { 2949 case NL80211_IFTYPE_ADHOC: 2950 /* DA SA BSSID */ 2951 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2952 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2953 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2954 build.hdr_len = 24; 2955 break; 2956 case NL80211_IFTYPE_STATION: 2957 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2958 /* DA SA BSSID */ 2959 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2960 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2961 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2962 build.hdr_len = 24; 2963 break; 2964 } 2965 2966 if (sdata->u.mgd.use_4addr) { 2967 /* non-regular ethertype cannot use the fastpath */ 2968 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2969 IEEE80211_FCTL_TODS); 2970 /* RA TA DA SA */ 2971 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2972 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2973 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2974 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2975 build.hdr_len = 30; 2976 break; 2977 } 2978 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2979 /* BSSID SA DA */ 2980 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2981 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2982 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2983 build.hdr_len = 24; 2984 break; 2985 case NL80211_IFTYPE_AP_VLAN: 2986 if (sdata->wdev.use_4addr) { 2987 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2988 IEEE80211_FCTL_TODS); 2989 /* RA TA DA SA */ 2990 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2991 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2992 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2993 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2994 build.hdr_len = 30; 2995 break; 2996 } 2997 fallthrough; 2998 case NL80211_IFTYPE_AP: 2999 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3000 /* DA BSSID SA */ 3001 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3002 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3003 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3004 build.hdr_len = 24; 3005 break; 3006 default: 3007 /* not handled on fast-xmit */ 3008 goto out; 3009 } 3010 3011 if (sta->sta.wme) { 3012 build.hdr_len += 2; 3013 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3014 } 3015 3016 /* We store the key here so there's no point in using rcu_dereference() 3017 * but that's fine because the code that changes the pointers will call 3018 * this function after doing so. For a single CPU that would be enough, 3019 * for multiple see the comment above. 3020 */ 3021 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3022 if (!build.key) 3023 build.key = rcu_access_pointer(sdata->default_unicast_key); 3024 if (build.key) { 3025 bool gen_iv, iv_spc, mmic; 3026 3027 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3028 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3029 mmic = build.key->conf.flags & 3030 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3031 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3032 3033 /* don't handle software crypto */ 3034 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3035 goto out; 3036 3037 /* Key is being removed */ 3038 if (build.key->flags & KEY_FLAG_TAINTED) 3039 goto out; 3040 3041 switch (build.key->conf.cipher) { 3042 case WLAN_CIPHER_SUITE_CCMP: 3043 case WLAN_CIPHER_SUITE_CCMP_256: 3044 if (gen_iv) 3045 build.pn_offs = build.hdr_len; 3046 if (gen_iv || iv_spc) 3047 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3048 break; 3049 case WLAN_CIPHER_SUITE_GCMP: 3050 case WLAN_CIPHER_SUITE_GCMP_256: 3051 if (gen_iv) 3052 build.pn_offs = build.hdr_len; 3053 if (gen_iv || iv_spc) 3054 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3055 break; 3056 case WLAN_CIPHER_SUITE_TKIP: 3057 /* cannot handle MMIC or IV generation in xmit-fast */ 3058 if (mmic || gen_iv) 3059 goto out; 3060 if (iv_spc) 3061 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3062 break; 3063 case WLAN_CIPHER_SUITE_WEP40: 3064 case WLAN_CIPHER_SUITE_WEP104: 3065 /* cannot handle IV generation in fast-xmit */ 3066 if (gen_iv) 3067 goto out; 3068 if (iv_spc) 3069 build.hdr_len += IEEE80211_WEP_IV_LEN; 3070 break; 3071 case WLAN_CIPHER_SUITE_AES_CMAC: 3072 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3073 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3074 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3075 WARN(1, 3076 "management cipher suite 0x%x enabled for data\n", 3077 build.key->conf.cipher); 3078 goto out; 3079 default: 3080 /* we don't know how to generate IVs for this at all */ 3081 if (WARN_ON(gen_iv)) 3082 goto out; 3083 /* pure hardware keys are OK, of course */ 3084 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3085 break; 3086 /* cipher scheme might require space allocation */ 3087 if (iv_spc && 3088 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3089 goto out; 3090 if (iv_spc) 3091 build.hdr_len += build.key->conf.iv_len; 3092 } 3093 3094 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3095 } 3096 3097 hdr->frame_control = fc; 3098 3099 memcpy(build.hdr + build.hdr_len, 3100 rfc1042_header, sizeof(rfc1042_header)); 3101 build.hdr_len += sizeof(rfc1042_header); 3102 3103 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3104 /* if the kmemdup fails, continue w/o fast_tx */ 3105 if (!fast_tx) 3106 goto out; 3107 3108 out: 3109 /* we might have raced against another call to this function */ 3110 old = rcu_dereference_protected(sta->fast_tx, 3111 lockdep_is_held(&sta->lock)); 3112 rcu_assign_pointer(sta->fast_tx, fast_tx); 3113 if (old) 3114 kfree_rcu(old, rcu_head); 3115 spin_unlock_bh(&sta->lock); 3116 } 3117 3118 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3119 { 3120 struct sta_info *sta; 3121 3122 rcu_read_lock(); 3123 list_for_each_entry_rcu(sta, &local->sta_list, list) 3124 ieee80211_check_fast_xmit(sta); 3125 rcu_read_unlock(); 3126 } 3127 3128 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3129 { 3130 struct ieee80211_local *local = sdata->local; 3131 struct sta_info *sta; 3132 3133 rcu_read_lock(); 3134 3135 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3136 if (sdata != sta->sdata && 3137 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3138 continue; 3139 ieee80211_check_fast_xmit(sta); 3140 } 3141 3142 rcu_read_unlock(); 3143 } 3144 3145 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3146 { 3147 struct ieee80211_fast_tx *fast_tx; 3148 3149 spin_lock_bh(&sta->lock); 3150 fast_tx = rcu_dereference_protected(sta->fast_tx, 3151 lockdep_is_held(&sta->lock)); 3152 RCU_INIT_POINTER(sta->fast_tx, NULL); 3153 spin_unlock_bh(&sta->lock); 3154 3155 if (fast_tx) 3156 kfree_rcu(fast_tx, rcu_head); 3157 } 3158 3159 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3160 struct sk_buff *skb, int headroom) 3161 { 3162 if (skb_headroom(skb) < headroom) { 3163 I802_DEBUG_INC(local->tx_expand_skb_head); 3164 3165 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3166 wiphy_debug(local->hw.wiphy, 3167 "failed to reallocate TX buffer\n"); 3168 return false; 3169 } 3170 } 3171 3172 return true; 3173 } 3174 3175 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3176 struct ieee80211_fast_tx *fast_tx, 3177 struct sk_buff *skb) 3178 { 3179 struct ieee80211_local *local = sdata->local; 3180 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3181 struct ieee80211_hdr *hdr; 3182 struct ethhdr *amsdu_hdr; 3183 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3184 int subframe_len = skb->len - hdr_len; 3185 void *data; 3186 u8 *qc, *h_80211_src, *h_80211_dst; 3187 const u8 *bssid; 3188 3189 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3190 return false; 3191 3192 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3193 return true; 3194 3195 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3196 return false; 3197 3198 data = skb_push(skb, sizeof(*amsdu_hdr)); 3199 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3200 hdr = data; 3201 amsdu_hdr = data + hdr_len; 3202 /* h_80211_src/dst is addr* field within hdr */ 3203 h_80211_src = data + fast_tx->sa_offs; 3204 h_80211_dst = data + fast_tx->da_offs; 3205 3206 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3207 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3208 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3209 3210 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3211 * fields needs to be changed to BSSID for A-MSDU frames depending 3212 * on FromDS/ToDS values. 3213 */ 3214 switch (sdata->vif.type) { 3215 case NL80211_IFTYPE_STATION: 3216 bssid = sdata->u.mgd.bssid; 3217 break; 3218 case NL80211_IFTYPE_AP: 3219 case NL80211_IFTYPE_AP_VLAN: 3220 bssid = sdata->vif.addr; 3221 break; 3222 default: 3223 bssid = NULL; 3224 } 3225 3226 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3227 ether_addr_copy(h_80211_src, bssid); 3228 3229 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3230 ether_addr_copy(h_80211_dst, bssid); 3231 3232 qc = ieee80211_get_qos_ctl(hdr); 3233 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3234 3235 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3236 3237 return true; 3238 } 3239 3240 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3241 struct sta_info *sta, 3242 struct ieee80211_fast_tx *fast_tx, 3243 struct sk_buff *skb) 3244 { 3245 struct ieee80211_local *local = sdata->local; 3246 struct fq *fq = &local->fq; 3247 struct fq_tin *tin; 3248 struct fq_flow *flow; 3249 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3250 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3251 struct txq_info *txqi; 3252 struct sk_buff **frag_tail, *head; 3253 int subframe_len = skb->len - ETH_ALEN; 3254 u8 max_subframes = sta->sta.max_amsdu_subframes; 3255 int max_frags = local->hw.max_tx_fragments; 3256 int max_amsdu_len = sta->sta.max_amsdu_len; 3257 int orig_truesize; 3258 u32 flow_idx; 3259 __be16 len; 3260 void *data; 3261 bool ret = false; 3262 unsigned int orig_len; 3263 int n = 2, nfrags, pad = 0; 3264 u16 hdrlen; 3265 3266 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3267 return false; 3268 3269 if (skb_is_gso(skb)) 3270 return false; 3271 3272 if (!txq) 3273 return false; 3274 3275 txqi = to_txq_info(txq); 3276 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3277 return false; 3278 3279 if (sta->sta.max_rc_amsdu_len) 3280 max_amsdu_len = min_t(int, max_amsdu_len, 3281 sta->sta.max_rc_amsdu_len); 3282 3283 if (sta->sta.max_tid_amsdu_len[tid]) 3284 max_amsdu_len = min_t(int, max_amsdu_len, 3285 sta->sta.max_tid_amsdu_len[tid]); 3286 3287 flow_idx = fq_flow_idx(fq, skb); 3288 3289 spin_lock_bh(&fq->lock); 3290 3291 /* TODO: Ideally aggregation should be done on dequeue to remain 3292 * responsive to environment changes. 3293 */ 3294 3295 tin = &txqi->tin; 3296 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3297 fq_flow_get_default_func); 3298 head = skb_peek_tail(&flow->queue); 3299 if (!head || skb_is_gso(head)) 3300 goto out; 3301 3302 orig_truesize = head->truesize; 3303 orig_len = head->len; 3304 3305 if (skb->len + head->len > max_amsdu_len) 3306 goto out; 3307 3308 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3309 nfrags += 1 + skb_shinfo(head)->nr_frags; 3310 frag_tail = &skb_shinfo(head)->frag_list; 3311 while (*frag_tail) { 3312 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3313 frag_tail = &(*frag_tail)->next; 3314 n++; 3315 } 3316 3317 if (max_subframes && n > max_subframes) 3318 goto out; 3319 3320 if (max_frags && nfrags > max_frags) 3321 goto out; 3322 3323 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3324 goto out; 3325 3326 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3327 goto out; 3328 3329 /* 3330 * Pad out the previous subframe to a multiple of 4 by adding the 3331 * padding to the next one, that's being added. Note that head->len 3332 * is the length of the full A-MSDU, but that works since each time 3333 * we add a new subframe we pad out the previous one to a multiple 3334 * of 4 and thus it no longer matters in the next round. 3335 */ 3336 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3337 if ((head->len - hdrlen) & 3) 3338 pad = 4 - ((head->len - hdrlen) & 3); 3339 3340 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3341 2 + pad)) 3342 goto out_recalc; 3343 3344 ret = true; 3345 data = skb_push(skb, ETH_ALEN + 2); 3346 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3347 3348 data += 2 * ETH_ALEN; 3349 len = cpu_to_be16(subframe_len); 3350 memcpy(data, &len, 2); 3351 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3352 3353 memset(skb_push(skb, pad), 0, pad); 3354 3355 head->len += skb->len; 3356 head->data_len += skb->len; 3357 *frag_tail = skb; 3358 3359 out_recalc: 3360 fq->memory_usage += head->truesize - orig_truesize; 3361 if (head->len != orig_len) { 3362 flow->backlog += head->len - orig_len; 3363 tin->backlog_bytes += head->len - orig_len; 3364 3365 fq_recalc_backlog(fq, tin, flow); 3366 } 3367 out: 3368 spin_unlock_bh(&fq->lock); 3369 3370 return ret; 3371 } 3372 3373 /* 3374 * Can be called while the sta lock is held. Anything that can cause packets to 3375 * be generated will cause deadlock! 3376 */ 3377 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3378 struct sta_info *sta, u8 pn_offs, 3379 struct ieee80211_key *key, 3380 struct sk_buff *skb) 3381 { 3382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3383 struct ieee80211_hdr *hdr = (void *)skb->data; 3384 u8 tid = IEEE80211_NUM_TIDS; 3385 3386 if (key) 3387 info->control.hw_key = &key->conf; 3388 3389 ieee80211_tx_stats(skb->dev, skb->len); 3390 3391 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3392 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3393 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3394 } else { 3395 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3396 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3397 sdata->sequence_number += 0x10; 3398 } 3399 3400 if (skb_shinfo(skb)->gso_size) 3401 sta->tx_stats.msdu[tid] += 3402 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3403 else 3404 sta->tx_stats.msdu[tid]++; 3405 3406 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3407 3408 /* statistics normally done by ieee80211_tx_h_stats (but that 3409 * has to consider fragmentation, so is more complex) 3410 */ 3411 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3412 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3413 3414 if (pn_offs) { 3415 u64 pn; 3416 u8 *crypto_hdr = skb->data + pn_offs; 3417 3418 switch (key->conf.cipher) { 3419 case WLAN_CIPHER_SUITE_CCMP: 3420 case WLAN_CIPHER_SUITE_CCMP_256: 3421 case WLAN_CIPHER_SUITE_GCMP: 3422 case WLAN_CIPHER_SUITE_GCMP_256: 3423 pn = atomic64_inc_return(&key->conf.tx_pn); 3424 crypto_hdr[0] = pn; 3425 crypto_hdr[1] = pn >> 8; 3426 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3427 crypto_hdr[4] = pn >> 16; 3428 crypto_hdr[5] = pn >> 24; 3429 crypto_hdr[6] = pn >> 32; 3430 crypto_hdr[7] = pn >> 40; 3431 break; 3432 } 3433 } 3434 } 3435 3436 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3437 struct sta_info *sta, 3438 struct ieee80211_fast_tx *fast_tx, 3439 struct sk_buff *skb) 3440 { 3441 struct ieee80211_local *local = sdata->local; 3442 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3443 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3444 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3445 struct ethhdr eth; 3446 struct ieee80211_tx_info *info; 3447 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3448 struct ieee80211_tx_data tx; 3449 ieee80211_tx_result r; 3450 struct tid_ampdu_tx *tid_tx = NULL; 3451 u8 tid = IEEE80211_NUM_TIDS; 3452 3453 /* control port protocol needs a lot of special handling */ 3454 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3455 return false; 3456 3457 /* only RFC 1042 SNAP */ 3458 if (ethertype < ETH_P_802_3_MIN) 3459 return false; 3460 3461 /* don't handle TX status request here either */ 3462 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3463 return false; 3464 3465 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3466 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3467 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3468 if (tid_tx) { 3469 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3470 return false; 3471 if (tid_tx->timeout) 3472 tid_tx->last_tx = jiffies; 3473 } 3474 } 3475 3476 /* after this point (skb is modified) we cannot return false */ 3477 3478 if (skb_shared(skb)) { 3479 struct sk_buff *tmp_skb = skb; 3480 3481 skb = skb_clone(skb, GFP_ATOMIC); 3482 kfree_skb(tmp_skb); 3483 3484 if (!skb) 3485 return true; 3486 } 3487 3488 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3489 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3490 return true; 3491 3492 /* will not be crypto-handled beyond what we do here, so use false 3493 * as the may-encrypt argument for the resize to not account for 3494 * more room than we already have in 'extra_head' 3495 */ 3496 if (unlikely(ieee80211_skb_resize(sdata, skb, 3497 max_t(int, extra_head + hw_headroom - 3498 skb_headroom(skb), 0), 3499 ENCRYPT_NO))) { 3500 kfree_skb(skb); 3501 return true; 3502 } 3503 3504 memcpy(ð, skb->data, ETH_HLEN - 2); 3505 hdr = skb_push(skb, extra_head); 3506 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3507 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3508 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3509 3510 info = IEEE80211_SKB_CB(skb); 3511 memset(info, 0, sizeof(*info)); 3512 info->band = fast_tx->band; 3513 info->control.vif = &sdata->vif; 3514 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3515 IEEE80211_TX_CTL_DONTFRAG | 3516 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3517 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3518 3519 #ifdef CONFIG_MAC80211_DEBUGFS 3520 if (local->force_tx_status) 3521 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3522 #endif 3523 3524 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3525 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3526 *ieee80211_get_qos_ctl(hdr) = tid; 3527 } 3528 3529 __skb_queue_head_init(&tx.skbs); 3530 3531 tx.flags = IEEE80211_TX_UNICAST; 3532 tx.local = local; 3533 tx.sdata = sdata; 3534 tx.sta = sta; 3535 tx.key = fast_tx->key; 3536 3537 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3538 tx.skb = skb; 3539 r = ieee80211_tx_h_rate_ctrl(&tx); 3540 skb = tx.skb; 3541 tx.skb = NULL; 3542 3543 if (r != TX_CONTINUE) { 3544 if (r != TX_QUEUED) 3545 kfree_skb(skb); 3546 return true; 3547 } 3548 } 3549 3550 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3551 return true; 3552 3553 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3554 fast_tx->key, skb); 3555 3556 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3557 sdata = container_of(sdata->bss, 3558 struct ieee80211_sub_if_data, u.ap); 3559 3560 __skb_queue_tail(&tx.skbs, skb); 3561 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3562 return true; 3563 } 3564 3565 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3566 struct ieee80211_txq *txq) 3567 { 3568 struct ieee80211_local *local = hw_to_local(hw); 3569 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3570 struct ieee80211_hdr *hdr; 3571 struct sk_buff *skb = NULL; 3572 struct fq *fq = &local->fq; 3573 struct fq_tin *tin = &txqi->tin; 3574 struct ieee80211_tx_info *info; 3575 struct ieee80211_tx_data tx; 3576 ieee80211_tx_result r; 3577 struct ieee80211_vif *vif = txq->vif; 3578 3579 WARN_ON_ONCE(softirq_count() == 0); 3580 3581 if (!ieee80211_txq_airtime_check(hw, txq)) 3582 return NULL; 3583 3584 begin: 3585 spin_lock_bh(&fq->lock); 3586 3587 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3588 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3589 goto out; 3590 3591 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3592 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3593 goto out; 3594 } 3595 3596 /* Make sure fragments stay together. */ 3597 skb = __skb_dequeue(&txqi->frags); 3598 if (skb) 3599 goto out; 3600 3601 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3602 if (!skb) 3603 goto out; 3604 3605 spin_unlock_bh(&fq->lock); 3606 3607 hdr = (struct ieee80211_hdr *)skb->data; 3608 info = IEEE80211_SKB_CB(skb); 3609 3610 memset(&tx, 0, sizeof(tx)); 3611 __skb_queue_head_init(&tx.skbs); 3612 tx.local = local; 3613 tx.skb = skb; 3614 tx.sdata = vif_to_sdata(info->control.vif); 3615 3616 if (txq->sta) { 3617 tx.sta = container_of(txq->sta, struct sta_info, sta); 3618 /* 3619 * Drop unicast frames to unauthorised stations unless they are 3620 * injected frames or EAPOL frames from the local station. 3621 */ 3622 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3623 ieee80211_is_data(hdr->frame_control) && 3624 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3625 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3626 !is_multicast_ether_addr(hdr->addr1) && 3627 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3628 (!(info->control.flags & 3629 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3630 !ether_addr_equal(tx.sdata->vif.addr, 3631 hdr->addr2)))) { 3632 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3633 ieee80211_free_txskb(&local->hw, skb); 3634 goto begin; 3635 } 3636 } 3637 3638 /* 3639 * The key can be removed while the packet was queued, so need to call 3640 * this here to get the current key. 3641 */ 3642 r = ieee80211_tx_h_select_key(&tx); 3643 if (r != TX_CONTINUE) { 3644 ieee80211_free_txskb(&local->hw, skb); 3645 goto begin; 3646 } 3647 3648 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3649 info->flags |= IEEE80211_TX_CTL_AMPDU; 3650 else 3651 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3652 3653 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) 3654 goto encap_out; 3655 3656 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3657 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3658 sta); 3659 u8 pn_offs = 0; 3660 3661 if (tx.key && 3662 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3663 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3664 3665 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3666 tx.key, skb); 3667 } else { 3668 if (invoke_tx_handlers_late(&tx)) 3669 goto begin; 3670 3671 skb = __skb_dequeue(&tx.skbs); 3672 3673 if (!skb_queue_empty(&tx.skbs)) { 3674 spin_lock_bh(&fq->lock); 3675 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3676 spin_unlock_bh(&fq->lock); 3677 } 3678 } 3679 3680 if (skb_has_frag_list(skb) && 3681 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3682 if (skb_linearize(skb)) { 3683 ieee80211_free_txskb(&local->hw, skb); 3684 goto begin; 3685 } 3686 } 3687 3688 switch (tx.sdata->vif.type) { 3689 case NL80211_IFTYPE_MONITOR: 3690 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3691 vif = &tx.sdata->vif; 3692 break; 3693 } 3694 tx.sdata = rcu_dereference(local->monitor_sdata); 3695 if (tx.sdata) { 3696 vif = &tx.sdata->vif; 3697 info->hw_queue = 3698 vif->hw_queue[skb_get_queue_mapping(skb)]; 3699 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3700 ieee80211_free_txskb(&local->hw, skb); 3701 goto begin; 3702 } else { 3703 vif = NULL; 3704 } 3705 break; 3706 case NL80211_IFTYPE_AP_VLAN: 3707 tx.sdata = container_of(tx.sdata->bss, 3708 struct ieee80211_sub_if_data, u.ap); 3709 fallthrough; 3710 default: 3711 vif = &tx.sdata->vif; 3712 break; 3713 } 3714 3715 encap_out: 3716 IEEE80211_SKB_CB(skb)->control.vif = vif; 3717 3718 if (vif && 3719 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3720 bool ampdu = txq->ac != IEEE80211_AC_VO; 3721 u32 airtime; 3722 3723 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3724 skb->len, ampdu); 3725 if (airtime) { 3726 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3727 ieee80211_sta_update_pending_airtime(local, tx.sta, 3728 txq->ac, 3729 airtime, 3730 false); 3731 } 3732 } 3733 3734 return skb; 3735 3736 out: 3737 spin_unlock_bh(&fq->lock); 3738 3739 return skb; 3740 } 3741 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3742 3743 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3744 { 3745 struct ieee80211_local *local = hw_to_local(hw); 3746 struct ieee80211_txq *ret = NULL; 3747 struct txq_info *txqi = NULL, *head = NULL; 3748 bool found_eligible_txq = false; 3749 3750 spin_lock_bh(&local->active_txq_lock[ac]); 3751 3752 begin: 3753 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3754 struct txq_info, 3755 schedule_order); 3756 if (!txqi) 3757 goto out; 3758 3759 if (txqi == head) { 3760 if (!found_eligible_txq) 3761 goto out; 3762 else 3763 found_eligible_txq = false; 3764 } 3765 3766 if (!head) 3767 head = txqi; 3768 3769 if (txqi->txq.sta) { 3770 struct sta_info *sta = container_of(txqi->txq.sta, 3771 struct sta_info, sta); 3772 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3773 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3774 3775 if (aql_check) 3776 found_eligible_txq = true; 3777 3778 if (deficit < 0) 3779 sta->airtime[txqi->txq.ac].deficit += 3780 sta->airtime_weight; 3781 3782 if (deficit < 0 || !aql_check) { 3783 list_move_tail(&txqi->schedule_order, 3784 &local->active_txqs[txqi->txq.ac]); 3785 goto begin; 3786 } 3787 } 3788 3789 3790 if (txqi->schedule_round == local->schedule_round[ac]) 3791 goto out; 3792 3793 list_del_init(&txqi->schedule_order); 3794 txqi->schedule_round = local->schedule_round[ac]; 3795 ret = &txqi->txq; 3796 3797 out: 3798 spin_unlock_bh(&local->active_txq_lock[ac]); 3799 return ret; 3800 } 3801 EXPORT_SYMBOL(ieee80211_next_txq); 3802 3803 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3804 struct ieee80211_txq *txq, 3805 bool force) 3806 { 3807 struct ieee80211_local *local = hw_to_local(hw); 3808 struct txq_info *txqi = to_txq_info(txq); 3809 3810 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3811 3812 if (list_empty(&txqi->schedule_order) && 3813 (force || !skb_queue_empty(&txqi->frags) || 3814 txqi->tin.backlog_packets)) { 3815 /* If airtime accounting is active, always enqueue STAs at the 3816 * head of the list to ensure that they only get moved to the 3817 * back by the airtime DRR scheduler once they have a negative 3818 * deficit. A station that already has a negative deficit will 3819 * get immediately moved to the back of the list on the next 3820 * call to ieee80211_next_txq(). 3821 */ 3822 if (txqi->txq.sta && 3823 wiphy_ext_feature_isset(local->hw.wiphy, 3824 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3825 list_add(&txqi->schedule_order, 3826 &local->active_txqs[txq->ac]); 3827 else 3828 list_add_tail(&txqi->schedule_order, 3829 &local->active_txqs[txq->ac]); 3830 } 3831 3832 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3833 } 3834 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3835 3836 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3837 struct ieee80211_txq *txq) 3838 { 3839 struct sta_info *sta; 3840 struct ieee80211_local *local = hw_to_local(hw); 3841 3842 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3843 return true; 3844 3845 if (!txq->sta) 3846 return true; 3847 3848 sta = container_of(txq->sta, struct sta_info, sta); 3849 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3850 sta->airtime[txq->ac].aql_limit_low) 3851 return true; 3852 3853 if (atomic_read(&local->aql_total_pending_airtime) < 3854 local->aql_threshold && 3855 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3856 sta->airtime[txq->ac].aql_limit_high) 3857 return true; 3858 3859 return false; 3860 } 3861 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3862 3863 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3864 struct ieee80211_txq *txq) 3865 { 3866 struct ieee80211_local *local = hw_to_local(hw); 3867 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3868 struct sta_info *sta; 3869 u8 ac = txq->ac; 3870 3871 spin_lock_bh(&local->active_txq_lock[ac]); 3872 3873 if (!txqi->txq.sta) 3874 goto out; 3875 3876 if (list_empty(&txqi->schedule_order)) 3877 goto out; 3878 3879 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3880 schedule_order) { 3881 if (iter == txqi) 3882 break; 3883 3884 if (!iter->txq.sta) { 3885 list_move_tail(&iter->schedule_order, 3886 &local->active_txqs[ac]); 3887 continue; 3888 } 3889 sta = container_of(iter->txq.sta, struct sta_info, sta); 3890 if (sta->airtime[ac].deficit < 0) 3891 sta->airtime[ac].deficit += sta->airtime_weight; 3892 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3893 } 3894 3895 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3896 if (sta->airtime[ac].deficit >= 0) 3897 goto out; 3898 3899 sta->airtime[ac].deficit += sta->airtime_weight; 3900 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3901 spin_unlock_bh(&local->active_txq_lock[ac]); 3902 3903 return false; 3904 out: 3905 if (!list_empty(&txqi->schedule_order)) 3906 list_del_init(&txqi->schedule_order); 3907 spin_unlock_bh(&local->active_txq_lock[ac]); 3908 3909 return true; 3910 } 3911 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3912 3913 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3914 { 3915 struct ieee80211_local *local = hw_to_local(hw); 3916 3917 spin_lock_bh(&local->active_txq_lock[ac]); 3918 local->schedule_round[ac]++; 3919 spin_unlock_bh(&local->active_txq_lock[ac]); 3920 } 3921 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3922 3923 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3924 struct net_device *dev, 3925 u32 info_flags, 3926 u32 ctrl_flags, 3927 u64 *cookie) 3928 { 3929 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3930 struct ieee80211_local *local = sdata->local; 3931 struct sta_info *sta; 3932 struct sk_buff *next; 3933 3934 if (unlikely(skb->len < ETH_HLEN)) { 3935 kfree_skb(skb); 3936 return; 3937 } 3938 3939 rcu_read_lock(); 3940 3941 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3942 goto out_free; 3943 3944 if (IS_ERR(sta)) 3945 sta = NULL; 3946 3947 if (local->ops->wake_tx_queue) { 3948 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3949 skb_set_queue_mapping(skb, queue); 3950 skb_get_hash(skb); 3951 } 3952 3953 if (sta) { 3954 struct ieee80211_fast_tx *fast_tx; 3955 3956 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3957 3958 fast_tx = rcu_dereference(sta->fast_tx); 3959 3960 if (fast_tx && 3961 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3962 goto out; 3963 } 3964 3965 if (skb_is_gso(skb)) { 3966 struct sk_buff *segs; 3967 3968 segs = skb_gso_segment(skb, 0); 3969 if (IS_ERR(segs)) { 3970 goto out_free; 3971 } else if (segs) { 3972 consume_skb(skb); 3973 skb = segs; 3974 } 3975 } else { 3976 /* we cannot process non-linear frames on this path */ 3977 if (skb_linearize(skb)) { 3978 kfree_skb(skb); 3979 goto out; 3980 } 3981 3982 /* the frame could be fragmented, software-encrypted, and other 3983 * things so we cannot really handle checksum offload with it - 3984 * fix it up in software before we handle anything else. 3985 */ 3986 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3987 skb_set_transport_header(skb, 3988 skb_checksum_start_offset(skb)); 3989 if (skb_checksum_help(skb)) 3990 goto out_free; 3991 } 3992 } 3993 3994 skb_list_walk_safe(skb, skb, next) { 3995 skb_mark_not_on_list(skb); 3996 3997 if (skb->protocol == sdata->control_port_protocol) 3998 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 3999 4000 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4001 sta, ctrl_flags, cookie); 4002 if (IS_ERR(skb)) { 4003 kfree_skb_list(next); 4004 goto out; 4005 } 4006 4007 ieee80211_tx_stats(dev, skb->len); 4008 4009 ieee80211_xmit(sdata, sta, skb); 4010 } 4011 goto out; 4012 out_free: 4013 kfree_skb(skb); 4014 out: 4015 rcu_read_unlock(); 4016 } 4017 4018 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4019 { 4020 struct ethhdr *eth; 4021 int err; 4022 4023 err = skb_ensure_writable(skb, ETH_HLEN); 4024 if (unlikely(err)) 4025 return err; 4026 4027 eth = (void *)skb->data; 4028 ether_addr_copy(eth->h_dest, sta->sta.addr); 4029 4030 return 0; 4031 } 4032 4033 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4034 struct net_device *dev) 4035 { 4036 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4037 const struct ethhdr *eth = (void *)skb->data; 4038 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4039 __be16 ethertype; 4040 4041 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4042 return false; 4043 4044 switch (sdata->vif.type) { 4045 case NL80211_IFTYPE_AP_VLAN: 4046 if (sdata->u.vlan.sta) 4047 return false; 4048 if (sdata->wdev.use_4addr) 4049 return false; 4050 fallthrough; 4051 case NL80211_IFTYPE_AP: 4052 /* check runtime toggle for this bss */ 4053 if (!sdata->bss->multicast_to_unicast) 4054 return false; 4055 break; 4056 default: 4057 return false; 4058 } 4059 4060 /* multicast to unicast conversion only for some payload */ 4061 ethertype = eth->h_proto; 4062 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4063 ethertype = ethvlan->h_vlan_encapsulated_proto; 4064 switch (ethertype) { 4065 case htons(ETH_P_ARP): 4066 case htons(ETH_P_IP): 4067 case htons(ETH_P_IPV6): 4068 break; 4069 default: 4070 return false; 4071 } 4072 4073 return true; 4074 } 4075 4076 static void 4077 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4078 struct sk_buff_head *queue) 4079 { 4080 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4081 struct ieee80211_local *local = sdata->local; 4082 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4083 struct sta_info *sta, *first = NULL; 4084 struct sk_buff *cloned_skb; 4085 4086 rcu_read_lock(); 4087 4088 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4089 if (sdata != sta->sdata) 4090 /* AP-VLAN mismatch */ 4091 continue; 4092 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4093 /* do not send back to source */ 4094 continue; 4095 if (!first) { 4096 first = sta; 4097 continue; 4098 } 4099 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4100 if (!cloned_skb) 4101 goto multicast; 4102 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4103 dev_kfree_skb(cloned_skb); 4104 goto multicast; 4105 } 4106 __skb_queue_tail(queue, cloned_skb); 4107 } 4108 4109 if (likely(first)) { 4110 if (unlikely(ieee80211_change_da(skb, first))) 4111 goto multicast; 4112 __skb_queue_tail(queue, skb); 4113 } else { 4114 /* no STA connected, drop */ 4115 kfree_skb(skb); 4116 skb = NULL; 4117 } 4118 4119 goto out; 4120 multicast: 4121 __skb_queue_purge(queue); 4122 __skb_queue_tail(queue, skb); 4123 out: 4124 rcu_read_unlock(); 4125 } 4126 4127 /** 4128 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4129 * @skb: packet to be sent 4130 * @dev: incoming interface 4131 * 4132 * On failure skb will be freed. 4133 */ 4134 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4135 struct net_device *dev) 4136 { 4137 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4138 struct sk_buff_head queue; 4139 4140 __skb_queue_head_init(&queue); 4141 ieee80211_convert_to_unicast(skb, dev, &queue); 4142 while ((skb = __skb_dequeue(&queue))) 4143 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4144 } else { 4145 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4146 } 4147 4148 return NETDEV_TX_OK; 4149 } 4150 4151 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4152 struct sk_buff *skb, int led_len, 4153 struct sta_info *sta, 4154 bool txpending) 4155 { 4156 struct ieee80211_local *local = sdata->local; 4157 struct ieee80211_tx_control control = {}; 4158 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4159 struct ieee80211_sta *pubsta = NULL; 4160 unsigned long flags; 4161 int q = info->hw_queue; 4162 4163 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4164 return true; 4165 4166 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4167 4168 if (local->queue_stop_reasons[q] || 4169 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4170 if (txpending) 4171 skb_queue_head(&local->pending[q], skb); 4172 else 4173 skb_queue_tail(&local->pending[q], skb); 4174 4175 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4176 4177 return false; 4178 } 4179 4180 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4181 4182 if (sta && sta->uploaded) 4183 pubsta = &sta->sta; 4184 4185 control.sta = pubsta; 4186 4187 drv_tx(local, &control, skb); 4188 4189 return true; 4190 } 4191 4192 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4193 struct net_device *dev, struct sta_info *sta, 4194 struct ieee80211_key *key, struct sk_buff *skb) 4195 { 4196 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4197 struct ieee80211_local *local = sdata->local; 4198 struct tid_ampdu_tx *tid_tx; 4199 u8 tid; 4200 4201 if (local->ops->wake_tx_queue) { 4202 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4203 skb_set_queue_mapping(skb, queue); 4204 skb_get_hash(skb); 4205 } 4206 4207 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4208 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4209 goto out_free; 4210 4211 memset(info, 0, sizeof(*info)); 4212 4213 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4214 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4215 if (tid_tx) { 4216 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4217 /* fall back to non-offload slow path */ 4218 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4219 return; 4220 } 4221 4222 info->flags |= IEEE80211_TX_CTL_AMPDU; 4223 if (tid_tx->timeout) 4224 tid_tx->last_tx = jiffies; 4225 } 4226 4227 if (unlikely(skb->sk && 4228 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4229 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4230 &info->flags, NULL); 4231 4232 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4233 4234 ieee80211_tx_stats(dev, skb->len); 4235 4236 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4237 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4238 4239 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4240 sdata = container_of(sdata->bss, 4241 struct ieee80211_sub_if_data, u.ap); 4242 4243 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4244 info->control.vif = &sdata->vif; 4245 4246 if (key) 4247 info->control.hw_key = &key->conf; 4248 4249 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4250 4251 return; 4252 4253 out_free: 4254 kfree_skb(skb); 4255 } 4256 4257 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4258 struct net_device *dev) 4259 { 4260 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4261 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4262 struct ieee80211_key *key; 4263 struct sta_info *sta; 4264 bool offload = true; 4265 4266 if (unlikely(skb->len < ETH_HLEN)) { 4267 kfree_skb(skb); 4268 return NETDEV_TX_OK; 4269 } 4270 4271 rcu_read_lock(); 4272 4273 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4274 kfree_skb(skb); 4275 goto out; 4276 } 4277 4278 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4279 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4280 sdata->control_port_protocol == ehdr->h_proto)) 4281 offload = false; 4282 else if ((key = rcu_dereference(sta->ptk[sta->ptk_idx])) && 4283 (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4284 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4285 offload = false; 4286 4287 if (offload) 4288 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4289 else 4290 ieee80211_subif_start_xmit(skb, dev); 4291 4292 out: 4293 rcu_read_unlock(); 4294 4295 return NETDEV_TX_OK; 4296 } 4297 4298 struct sk_buff * 4299 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4300 struct sk_buff *skb, u32 info_flags) 4301 { 4302 struct ieee80211_hdr *hdr; 4303 struct ieee80211_tx_data tx = { 4304 .local = sdata->local, 4305 .sdata = sdata, 4306 }; 4307 struct sta_info *sta; 4308 4309 rcu_read_lock(); 4310 4311 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4312 kfree_skb(skb); 4313 skb = ERR_PTR(-EINVAL); 4314 goto out; 4315 } 4316 4317 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4318 if (IS_ERR(skb)) 4319 goto out; 4320 4321 hdr = (void *)skb->data; 4322 tx.sta = sta_info_get(sdata, hdr->addr1); 4323 tx.skb = skb; 4324 4325 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4326 rcu_read_unlock(); 4327 kfree_skb(skb); 4328 return ERR_PTR(-EINVAL); 4329 } 4330 4331 out: 4332 rcu_read_unlock(); 4333 return skb; 4334 } 4335 4336 /* 4337 * ieee80211_clear_tx_pending may not be called in a context where 4338 * it is possible that it packets could come in again. 4339 */ 4340 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4341 { 4342 struct sk_buff *skb; 4343 int i; 4344 4345 for (i = 0; i < local->hw.queues; i++) { 4346 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4347 ieee80211_free_txskb(&local->hw, skb); 4348 } 4349 } 4350 4351 /* 4352 * Returns false if the frame couldn't be transmitted but was queued instead, 4353 * which in this case means re-queued -- take as an indication to stop sending 4354 * more pending frames. 4355 */ 4356 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4357 struct sk_buff *skb) 4358 { 4359 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4360 struct ieee80211_sub_if_data *sdata; 4361 struct sta_info *sta; 4362 struct ieee80211_hdr *hdr; 4363 bool result; 4364 struct ieee80211_chanctx_conf *chanctx_conf; 4365 4366 sdata = vif_to_sdata(info->control.vif); 4367 4368 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4369 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4370 if (unlikely(!chanctx_conf)) { 4371 dev_kfree_skb(skb); 4372 return true; 4373 } 4374 info->band = chanctx_conf->def.chan->band; 4375 result = ieee80211_tx(sdata, NULL, skb, true); 4376 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4377 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4378 dev_kfree_skb(skb); 4379 return true; 4380 } 4381 4382 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4383 sta = NULL; 4384 4385 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4386 } else { 4387 struct sk_buff_head skbs; 4388 4389 __skb_queue_head_init(&skbs); 4390 __skb_queue_tail(&skbs, skb); 4391 4392 hdr = (struct ieee80211_hdr *)skb->data; 4393 sta = sta_info_get(sdata, hdr->addr1); 4394 4395 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4396 } 4397 4398 return result; 4399 } 4400 4401 /* 4402 * Transmit all pending packets. Called from tasklet. 4403 */ 4404 void ieee80211_tx_pending(struct tasklet_struct *t) 4405 { 4406 struct ieee80211_local *local = from_tasklet(local, t, 4407 tx_pending_tasklet); 4408 unsigned long flags; 4409 int i; 4410 bool txok; 4411 4412 rcu_read_lock(); 4413 4414 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4415 for (i = 0; i < local->hw.queues; i++) { 4416 /* 4417 * If queue is stopped by something other than due to pending 4418 * frames, or we have no pending frames, proceed to next queue. 4419 */ 4420 if (local->queue_stop_reasons[i] || 4421 skb_queue_empty(&local->pending[i])) 4422 continue; 4423 4424 while (!skb_queue_empty(&local->pending[i])) { 4425 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4426 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4427 4428 if (WARN_ON(!info->control.vif)) { 4429 ieee80211_free_txskb(&local->hw, skb); 4430 continue; 4431 } 4432 4433 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4434 flags); 4435 4436 txok = ieee80211_tx_pending_skb(local, skb); 4437 spin_lock_irqsave(&local->queue_stop_reason_lock, 4438 flags); 4439 if (!txok) 4440 break; 4441 } 4442 4443 if (skb_queue_empty(&local->pending[i])) 4444 ieee80211_propagate_queue_wake(local, i); 4445 } 4446 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4447 4448 rcu_read_unlock(); 4449 } 4450 4451 /* functions for drivers to get certain frames */ 4452 4453 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4454 struct ps_data *ps, struct sk_buff *skb, 4455 bool is_template) 4456 { 4457 u8 *pos, *tim; 4458 int aid0 = 0; 4459 int i, have_bits = 0, n1, n2; 4460 4461 /* Generate bitmap for TIM only if there are any STAs in power save 4462 * mode. */ 4463 if (atomic_read(&ps->num_sta_ps) > 0) 4464 /* in the hope that this is faster than 4465 * checking byte-for-byte */ 4466 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4467 IEEE80211_MAX_AID+1); 4468 if (!is_template) { 4469 if (ps->dtim_count == 0) 4470 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4471 else 4472 ps->dtim_count--; 4473 } 4474 4475 tim = pos = skb_put(skb, 6); 4476 *pos++ = WLAN_EID_TIM; 4477 *pos++ = 4; 4478 *pos++ = ps->dtim_count; 4479 *pos++ = sdata->vif.bss_conf.dtim_period; 4480 4481 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4482 aid0 = 1; 4483 4484 ps->dtim_bc_mc = aid0 == 1; 4485 4486 if (have_bits) { 4487 /* Find largest even number N1 so that bits numbered 1 through 4488 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4489 * (N2 + 1) x 8 through 2007 are 0. */ 4490 n1 = 0; 4491 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4492 if (ps->tim[i]) { 4493 n1 = i & 0xfe; 4494 break; 4495 } 4496 } 4497 n2 = n1; 4498 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4499 if (ps->tim[i]) { 4500 n2 = i; 4501 break; 4502 } 4503 } 4504 4505 /* Bitmap control */ 4506 *pos++ = n1 | aid0; 4507 /* Part Virt Bitmap */ 4508 skb_put(skb, n2 - n1); 4509 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4510 4511 tim[1] = n2 - n1 + 4; 4512 } else { 4513 *pos++ = aid0; /* Bitmap control */ 4514 *pos++ = 0; /* Part Virt Bitmap */ 4515 } 4516 } 4517 4518 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4519 struct ps_data *ps, struct sk_buff *skb, 4520 bool is_template) 4521 { 4522 struct ieee80211_local *local = sdata->local; 4523 4524 /* 4525 * Not very nice, but we want to allow the driver to call 4526 * ieee80211_beacon_get() as a response to the set_tim() 4527 * callback. That, however, is already invoked under the 4528 * sta_lock to guarantee consistent and race-free update 4529 * of the tim bitmap in mac80211 and the driver. 4530 */ 4531 if (local->tim_in_locked_section) { 4532 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4533 } else { 4534 spin_lock_bh(&local->tim_lock); 4535 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4536 spin_unlock_bh(&local->tim_lock); 4537 } 4538 4539 return 0; 4540 } 4541 4542 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4543 struct beacon_data *beacon) 4544 { 4545 struct probe_resp *resp; 4546 u8 *beacon_data; 4547 size_t beacon_data_len; 4548 int i; 4549 u8 count = beacon->cntdwn_current_counter; 4550 4551 switch (sdata->vif.type) { 4552 case NL80211_IFTYPE_AP: 4553 beacon_data = beacon->tail; 4554 beacon_data_len = beacon->tail_len; 4555 break; 4556 case NL80211_IFTYPE_ADHOC: 4557 beacon_data = beacon->head; 4558 beacon_data_len = beacon->head_len; 4559 break; 4560 case NL80211_IFTYPE_MESH_POINT: 4561 beacon_data = beacon->head; 4562 beacon_data_len = beacon->head_len; 4563 break; 4564 default: 4565 return; 4566 } 4567 4568 rcu_read_lock(); 4569 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; ++i) { 4570 resp = rcu_dereference(sdata->u.ap.probe_resp); 4571 4572 if (beacon->cntdwn_counter_offsets[i]) { 4573 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[i] >= 4574 beacon_data_len)) { 4575 rcu_read_unlock(); 4576 return; 4577 } 4578 4579 beacon_data[beacon->cntdwn_counter_offsets[i]] = count; 4580 } 4581 4582 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4583 resp->data[resp->cntdwn_counter_offsets[i]] = count; 4584 } 4585 rcu_read_unlock(); 4586 } 4587 4588 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4589 { 4590 beacon->cntdwn_current_counter--; 4591 4592 /* the counter should never reach 0 */ 4593 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4594 4595 return beacon->cntdwn_current_counter; 4596 } 4597 4598 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4599 { 4600 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4601 struct beacon_data *beacon = NULL; 4602 u8 count = 0; 4603 4604 rcu_read_lock(); 4605 4606 if (sdata->vif.type == NL80211_IFTYPE_AP) 4607 beacon = rcu_dereference(sdata->u.ap.beacon); 4608 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4609 beacon = rcu_dereference(sdata->u.ibss.presp); 4610 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4611 beacon = rcu_dereference(sdata->u.mesh.beacon); 4612 4613 if (!beacon) 4614 goto unlock; 4615 4616 count = __ieee80211_beacon_update_cntdwn(beacon); 4617 4618 unlock: 4619 rcu_read_unlock(); 4620 return count; 4621 } 4622 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4623 4624 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4625 { 4626 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4627 struct beacon_data *beacon = NULL; 4628 4629 rcu_read_lock(); 4630 4631 if (sdata->vif.type == NL80211_IFTYPE_AP) 4632 beacon = rcu_dereference(sdata->u.ap.beacon); 4633 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4634 beacon = rcu_dereference(sdata->u.ibss.presp); 4635 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4636 beacon = rcu_dereference(sdata->u.mesh.beacon); 4637 4638 if (!beacon) 4639 goto unlock; 4640 4641 if (counter < beacon->cntdwn_current_counter) 4642 beacon->cntdwn_current_counter = counter; 4643 4644 unlock: 4645 rcu_read_unlock(); 4646 } 4647 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4648 4649 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4650 { 4651 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4652 struct beacon_data *beacon = NULL; 4653 u8 *beacon_data; 4654 size_t beacon_data_len; 4655 int ret = false; 4656 4657 if (!ieee80211_sdata_running(sdata)) 4658 return false; 4659 4660 rcu_read_lock(); 4661 if (vif->type == NL80211_IFTYPE_AP) { 4662 struct ieee80211_if_ap *ap = &sdata->u.ap; 4663 4664 beacon = rcu_dereference(ap->beacon); 4665 if (WARN_ON(!beacon || !beacon->tail)) 4666 goto out; 4667 beacon_data = beacon->tail; 4668 beacon_data_len = beacon->tail_len; 4669 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4670 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4671 4672 beacon = rcu_dereference(ifibss->presp); 4673 if (!beacon) 4674 goto out; 4675 4676 beacon_data = beacon->head; 4677 beacon_data_len = beacon->head_len; 4678 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4679 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4680 4681 beacon = rcu_dereference(ifmsh->beacon); 4682 if (!beacon) 4683 goto out; 4684 4685 beacon_data = beacon->head; 4686 beacon_data_len = beacon->head_len; 4687 } else { 4688 WARN_ON(1); 4689 goto out; 4690 } 4691 4692 if (!beacon->cntdwn_counter_offsets[0]) 4693 goto out; 4694 4695 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4696 goto out; 4697 4698 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4699 ret = true; 4700 4701 out: 4702 rcu_read_unlock(); 4703 4704 return ret; 4705 } 4706 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4707 4708 static int ieee80211_beacon_protect(struct sk_buff *skb, 4709 struct ieee80211_local *local, 4710 struct ieee80211_sub_if_data *sdata) 4711 { 4712 ieee80211_tx_result res; 4713 struct ieee80211_tx_data tx; 4714 struct sk_buff *check_skb; 4715 4716 memset(&tx, 0, sizeof(tx)); 4717 tx.key = rcu_dereference(sdata->default_beacon_key); 4718 if (!tx.key) 4719 return 0; 4720 tx.local = local; 4721 tx.sdata = sdata; 4722 __skb_queue_head_init(&tx.skbs); 4723 __skb_queue_tail(&tx.skbs, skb); 4724 res = ieee80211_tx_h_encrypt(&tx); 4725 check_skb = __skb_dequeue(&tx.skbs); 4726 /* we may crash after this, but it'd be a bug in crypto */ 4727 WARN_ON(check_skb != skb); 4728 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4729 return -EINVAL; 4730 4731 return 0; 4732 } 4733 4734 static struct sk_buff * 4735 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4736 struct ieee80211_vif *vif, 4737 struct ieee80211_mutable_offsets *offs, 4738 bool is_template) 4739 { 4740 struct ieee80211_local *local = hw_to_local(hw); 4741 struct beacon_data *beacon = NULL; 4742 struct sk_buff *skb = NULL; 4743 struct ieee80211_tx_info *info; 4744 struct ieee80211_sub_if_data *sdata = NULL; 4745 enum nl80211_band band; 4746 struct ieee80211_tx_rate_control txrc; 4747 struct ieee80211_chanctx_conf *chanctx_conf; 4748 int csa_off_base = 0; 4749 4750 rcu_read_lock(); 4751 4752 sdata = vif_to_sdata(vif); 4753 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4754 4755 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4756 goto out; 4757 4758 if (offs) 4759 memset(offs, 0, sizeof(*offs)); 4760 4761 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4762 struct ieee80211_if_ap *ap = &sdata->u.ap; 4763 4764 beacon = rcu_dereference(ap->beacon); 4765 if (beacon) { 4766 if (beacon->cntdwn_counter_offsets[0]) { 4767 if (!is_template) 4768 ieee80211_beacon_update_cntdwn(vif); 4769 4770 ieee80211_set_beacon_cntdwn(sdata, beacon); 4771 } 4772 4773 /* 4774 * headroom, head length, 4775 * tail length and maximum TIM length 4776 */ 4777 skb = dev_alloc_skb(local->tx_headroom + 4778 beacon->head_len + 4779 beacon->tail_len + 256 + 4780 local->hw.extra_beacon_tailroom); 4781 if (!skb) 4782 goto out; 4783 4784 skb_reserve(skb, local->tx_headroom); 4785 skb_put_data(skb, beacon->head, beacon->head_len); 4786 4787 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4788 is_template); 4789 4790 if (offs) { 4791 offs->tim_offset = beacon->head_len; 4792 offs->tim_length = skb->len - beacon->head_len; 4793 4794 /* for AP the csa offsets are from tail */ 4795 csa_off_base = skb->len; 4796 } 4797 4798 if (beacon->tail) 4799 skb_put_data(skb, beacon->tail, 4800 beacon->tail_len); 4801 4802 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4803 goto out; 4804 } else 4805 goto out; 4806 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4807 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4808 struct ieee80211_hdr *hdr; 4809 4810 beacon = rcu_dereference(ifibss->presp); 4811 if (!beacon) 4812 goto out; 4813 4814 if (beacon->cntdwn_counter_offsets[0]) { 4815 if (!is_template) 4816 __ieee80211_beacon_update_cntdwn(beacon); 4817 4818 ieee80211_set_beacon_cntdwn(sdata, beacon); 4819 } 4820 4821 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4822 local->hw.extra_beacon_tailroom); 4823 if (!skb) 4824 goto out; 4825 skb_reserve(skb, local->tx_headroom); 4826 skb_put_data(skb, beacon->head, beacon->head_len); 4827 4828 hdr = (struct ieee80211_hdr *) skb->data; 4829 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4830 IEEE80211_STYPE_BEACON); 4831 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4832 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4833 4834 beacon = rcu_dereference(ifmsh->beacon); 4835 if (!beacon) 4836 goto out; 4837 4838 if (beacon->cntdwn_counter_offsets[0]) { 4839 if (!is_template) 4840 /* TODO: For mesh csa_counter is in TU, so 4841 * decrementing it by one isn't correct, but 4842 * for now we leave it consistent with overall 4843 * mac80211's behavior. 4844 */ 4845 __ieee80211_beacon_update_cntdwn(beacon); 4846 4847 ieee80211_set_beacon_cntdwn(sdata, beacon); 4848 } 4849 4850 if (ifmsh->sync_ops) 4851 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4852 4853 skb = dev_alloc_skb(local->tx_headroom + 4854 beacon->head_len + 4855 256 + /* TIM IE */ 4856 beacon->tail_len + 4857 local->hw.extra_beacon_tailroom); 4858 if (!skb) 4859 goto out; 4860 skb_reserve(skb, local->tx_headroom); 4861 skb_put_data(skb, beacon->head, beacon->head_len); 4862 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4863 4864 if (offs) { 4865 offs->tim_offset = beacon->head_len; 4866 offs->tim_length = skb->len - beacon->head_len; 4867 } 4868 4869 skb_put_data(skb, beacon->tail, beacon->tail_len); 4870 } else { 4871 WARN_ON(1); 4872 goto out; 4873 } 4874 4875 /* CSA offsets */ 4876 if (offs && beacon) { 4877 int i; 4878 4879 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4880 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 4881 4882 if (!csa_off) 4883 continue; 4884 4885 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 4886 } 4887 } 4888 4889 band = chanctx_conf->def.chan->band; 4890 4891 info = IEEE80211_SKB_CB(skb); 4892 4893 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4894 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4895 info->band = band; 4896 4897 memset(&txrc, 0, sizeof(txrc)); 4898 txrc.hw = hw; 4899 txrc.sband = local->hw.wiphy->bands[band]; 4900 txrc.bss_conf = &sdata->vif.bss_conf; 4901 txrc.skb = skb; 4902 txrc.reported_rate.idx = -1; 4903 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4904 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4905 else 4906 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4907 txrc.bss = true; 4908 rate_control_get_rate(sdata, NULL, &txrc); 4909 4910 info->control.vif = vif; 4911 4912 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4913 IEEE80211_TX_CTL_ASSIGN_SEQ | 4914 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4915 out: 4916 rcu_read_unlock(); 4917 return skb; 4918 4919 } 4920 4921 struct sk_buff * 4922 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4923 struct ieee80211_vif *vif, 4924 struct ieee80211_mutable_offsets *offs) 4925 { 4926 return __ieee80211_beacon_get(hw, vif, offs, true); 4927 } 4928 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4929 4930 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4931 struct ieee80211_vif *vif, 4932 u16 *tim_offset, u16 *tim_length) 4933 { 4934 struct ieee80211_mutable_offsets offs = {}; 4935 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4936 struct sk_buff *copy; 4937 struct ieee80211_supported_band *sband; 4938 int shift; 4939 4940 if (!bcn) 4941 return bcn; 4942 4943 if (tim_offset) 4944 *tim_offset = offs.tim_offset; 4945 4946 if (tim_length) 4947 *tim_length = offs.tim_length; 4948 4949 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4950 !hw_to_local(hw)->monitors) 4951 return bcn; 4952 4953 /* send a copy to monitor interfaces */ 4954 copy = skb_copy(bcn, GFP_ATOMIC); 4955 if (!copy) 4956 return bcn; 4957 4958 shift = ieee80211_vif_get_shift(vif); 4959 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4960 if (!sband) 4961 return bcn; 4962 4963 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4964 NULL); 4965 4966 return bcn; 4967 } 4968 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4969 4970 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4971 struct ieee80211_vif *vif) 4972 { 4973 struct ieee80211_if_ap *ap = NULL; 4974 struct sk_buff *skb = NULL; 4975 struct probe_resp *presp = NULL; 4976 struct ieee80211_hdr *hdr; 4977 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4978 4979 if (sdata->vif.type != NL80211_IFTYPE_AP) 4980 return NULL; 4981 4982 rcu_read_lock(); 4983 4984 ap = &sdata->u.ap; 4985 presp = rcu_dereference(ap->probe_resp); 4986 if (!presp) 4987 goto out; 4988 4989 skb = dev_alloc_skb(presp->len); 4990 if (!skb) 4991 goto out; 4992 4993 skb_put_data(skb, presp->data, presp->len); 4994 4995 hdr = (struct ieee80211_hdr *) skb->data; 4996 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4997 4998 out: 4999 rcu_read_unlock(); 5000 return skb; 5001 } 5002 EXPORT_SYMBOL(ieee80211_proberesp_get); 5003 5004 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5005 struct ieee80211_vif *vif) 5006 { 5007 struct sk_buff *skb = NULL; 5008 struct fils_discovery_data *tmpl = NULL; 5009 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5010 5011 if (sdata->vif.type != NL80211_IFTYPE_AP) 5012 return NULL; 5013 5014 rcu_read_lock(); 5015 tmpl = rcu_dereference(sdata->u.ap.fils_discovery); 5016 if (!tmpl) { 5017 rcu_read_unlock(); 5018 return NULL; 5019 } 5020 5021 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5022 if (skb) { 5023 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5024 skb_put_data(skb, tmpl->data, tmpl->len); 5025 } 5026 5027 rcu_read_unlock(); 5028 return skb; 5029 } 5030 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5031 5032 struct sk_buff * 5033 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5034 struct ieee80211_vif *vif) 5035 { 5036 struct sk_buff *skb = NULL; 5037 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5038 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5039 5040 if (sdata->vif.type != NL80211_IFTYPE_AP) 5041 return NULL; 5042 5043 rcu_read_lock(); 5044 tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp); 5045 if (!tmpl) { 5046 rcu_read_unlock(); 5047 return NULL; 5048 } 5049 5050 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5051 if (skb) { 5052 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5053 skb_put_data(skb, tmpl->data, tmpl->len); 5054 } 5055 5056 rcu_read_unlock(); 5057 return skb; 5058 } 5059 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5060 5061 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5062 struct ieee80211_vif *vif) 5063 { 5064 struct ieee80211_sub_if_data *sdata; 5065 struct ieee80211_if_managed *ifmgd; 5066 struct ieee80211_pspoll *pspoll; 5067 struct ieee80211_local *local; 5068 struct sk_buff *skb; 5069 5070 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5071 return NULL; 5072 5073 sdata = vif_to_sdata(vif); 5074 ifmgd = &sdata->u.mgd; 5075 local = sdata->local; 5076 5077 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5078 if (!skb) 5079 return NULL; 5080 5081 skb_reserve(skb, local->hw.extra_tx_headroom); 5082 5083 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5084 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5085 IEEE80211_STYPE_PSPOLL); 5086 pspoll->aid = cpu_to_le16(sdata->vif.bss_conf.aid); 5087 5088 /* aid in PS-Poll has its two MSBs each set to 1 */ 5089 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5090 5091 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5092 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5093 5094 return skb; 5095 } 5096 EXPORT_SYMBOL(ieee80211_pspoll_get); 5097 5098 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5099 struct ieee80211_vif *vif, 5100 bool qos_ok) 5101 { 5102 struct ieee80211_hdr_3addr *nullfunc; 5103 struct ieee80211_sub_if_data *sdata; 5104 struct ieee80211_if_managed *ifmgd; 5105 struct ieee80211_local *local; 5106 struct sk_buff *skb; 5107 bool qos = false; 5108 5109 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5110 return NULL; 5111 5112 sdata = vif_to_sdata(vif); 5113 ifmgd = &sdata->u.mgd; 5114 local = sdata->local; 5115 5116 if (qos_ok) { 5117 struct sta_info *sta; 5118 5119 rcu_read_lock(); 5120 sta = sta_info_get(sdata, ifmgd->bssid); 5121 qos = sta && sta->sta.wme; 5122 rcu_read_unlock(); 5123 } 5124 5125 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5126 sizeof(*nullfunc) + 2); 5127 if (!skb) 5128 return NULL; 5129 5130 skb_reserve(skb, local->hw.extra_tx_headroom); 5131 5132 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5133 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5134 IEEE80211_STYPE_NULLFUNC | 5135 IEEE80211_FCTL_TODS); 5136 if (qos) { 5137 __le16 qoshdr = cpu_to_le16(7); 5138 5139 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5140 IEEE80211_STYPE_NULLFUNC) != 5141 IEEE80211_STYPE_QOS_NULLFUNC); 5142 nullfunc->frame_control |= 5143 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5144 skb->priority = 7; 5145 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5146 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5147 } 5148 5149 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5150 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5151 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5152 5153 return skb; 5154 } 5155 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5156 5157 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5158 const u8 *src_addr, 5159 const u8 *ssid, size_t ssid_len, 5160 size_t tailroom) 5161 { 5162 struct ieee80211_local *local = hw_to_local(hw); 5163 struct ieee80211_hdr_3addr *hdr; 5164 struct sk_buff *skb; 5165 size_t ie_ssid_len; 5166 u8 *pos; 5167 5168 ie_ssid_len = 2 + ssid_len; 5169 5170 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5171 ie_ssid_len + tailroom); 5172 if (!skb) 5173 return NULL; 5174 5175 skb_reserve(skb, local->hw.extra_tx_headroom); 5176 5177 hdr = skb_put_zero(skb, sizeof(*hdr)); 5178 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5179 IEEE80211_STYPE_PROBE_REQ); 5180 eth_broadcast_addr(hdr->addr1); 5181 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5182 eth_broadcast_addr(hdr->addr3); 5183 5184 pos = skb_put(skb, ie_ssid_len); 5185 *pos++ = WLAN_EID_SSID; 5186 *pos++ = ssid_len; 5187 if (ssid_len) 5188 memcpy(pos, ssid, ssid_len); 5189 pos += ssid_len; 5190 5191 return skb; 5192 } 5193 EXPORT_SYMBOL(ieee80211_probereq_get); 5194 5195 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5196 const void *frame, size_t frame_len, 5197 const struct ieee80211_tx_info *frame_txctl, 5198 struct ieee80211_rts *rts) 5199 { 5200 const struct ieee80211_hdr *hdr = frame; 5201 5202 rts->frame_control = 5203 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5204 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5205 frame_txctl); 5206 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5207 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5208 } 5209 EXPORT_SYMBOL(ieee80211_rts_get); 5210 5211 void ieee80211_ctstoself_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_cts *cts) 5215 { 5216 const struct ieee80211_hdr *hdr = frame; 5217 5218 cts->frame_control = 5219 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5220 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5221 frame_len, frame_txctl); 5222 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5223 } 5224 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5225 5226 struct sk_buff * 5227 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5228 struct ieee80211_vif *vif) 5229 { 5230 struct ieee80211_local *local = hw_to_local(hw); 5231 struct sk_buff *skb = NULL; 5232 struct ieee80211_tx_data tx; 5233 struct ieee80211_sub_if_data *sdata; 5234 struct ps_data *ps; 5235 struct ieee80211_tx_info *info; 5236 struct ieee80211_chanctx_conf *chanctx_conf; 5237 5238 sdata = vif_to_sdata(vif); 5239 5240 rcu_read_lock(); 5241 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5242 5243 if (!chanctx_conf) 5244 goto out; 5245 5246 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5247 struct beacon_data *beacon = 5248 rcu_dereference(sdata->u.ap.beacon); 5249 5250 if (!beacon || !beacon->head) 5251 goto out; 5252 5253 ps = &sdata->u.ap.ps; 5254 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5255 ps = &sdata->u.mesh.ps; 5256 } else { 5257 goto out; 5258 } 5259 5260 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5261 goto out; /* send buffered bc/mc only after DTIM beacon */ 5262 5263 while (1) { 5264 skb = skb_dequeue(&ps->bc_buf); 5265 if (!skb) 5266 goto out; 5267 local->total_ps_buffered--; 5268 5269 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5270 struct ieee80211_hdr *hdr = 5271 (struct ieee80211_hdr *) skb->data; 5272 /* more buffered multicast/broadcast frames ==> set 5273 * MoreData flag in IEEE 802.11 header to inform PS 5274 * STAs */ 5275 hdr->frame_control |= 5276 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5277 } 5278 5279 if (sdata->vif.type == NL80211_IFTYPE_AP) 5280 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5281 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5282 break; 5283 ieee80211_free_txskb(hw, skb); 5284 } 5285 5286 info = IEEE80211_SKB_CB(skb); 5287 5288 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5289 info->band = chanctx_conf->def.chan->band; 5290 5291 if (invoke_tx_handlers(&tx)) 5292 skb = NULL; 5293 out: 5294 rcu_read_unlock(); 5295 5296 return skb; 5297 } 5298 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5299 5300 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5301 { 5302 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5303 struct ieee80211_sub_if_data *sdata = sta->sdata; 5304 struct ieee80211_local *local = sdata->local; 5305 int ret; 5306 u32 queues; 5307 5308 lockdep_assert_held(&local->sta_mtx); 5309 5310 /* only some cases are supported right now */ 5311 switch (sdata->vif.type) { 5312 case NL80211_IFTYPE_STATION: 5313 case NL80211_IFTYPE_AP: 5314 case NL80211_IFTYPE_AP_VLAN: 5315 break; 5316 default: 5317 WARN_ON(1); 5318 return -EINVAL; 5319 } 5320 5321 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5322 return -EINVAL; 5323 5324 if (sta->reserved_tid == tid) { 5325 ret = 0; 5326 goto out; 5327 } 5328 5329 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5330 sdata_err(sdata, "TID reservation already active\n"); 5331 ret = -EALREADY; 5332 goto out; 5333 } 5334 5335 ieee80211_stop_vif_queues(sdata->local, sdata, 5336 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5337 5338 synchronize_net(); 5339 5340 /* Tear down BA sessions so we stop aggregating on this TID */ 5341 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5342 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5343 __ieee80211_stop_tx_ba_session(sta, tid, 5344 AGG_STOP_LOCAL_REQUEST); 5345 } 5346 5347 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5348 __ieee80211_flush_queues(local, sdata, queues, false); 5349 5350 sta->reserved_tid = tid; 5351 5352 ieee80211_wake_vif_queues(local, sdata, 5353 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5354 5355 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5356 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5357 5358 ret = 0; 5359 out: 5360 return ret; 5361 } 5362 EXPORT_SYMBOL(ieee80211_reserve_tid); 5363 5364 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5365 { 5366 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5367 struct ieee80211_sub_if_data *sdata = sta->sdata; 5368 5369 lockdep_assert_held(&sdata->local->sta_mtx); 5370 5371 /* only some cases are supported right now */ 5372 switch (sdata->vif.type) { 5373 case NL80211_IFTYPE_STATION: 5374 case NL80211_IFTYPE_AP: 5375 case NL80211_IFTYPE_AP_VLAN: 5376 break; 5377 default: 5378 WARN_ON(1); 5379 return; 5380 } 5381 5382 if (tid != sta->reserved_tid) { 5383 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5384 return; 5385 } 5386 5387 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5388 } 5389 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5390 5391 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5392 struct sk_buff *skb, int tid, 5393 enum nl80211_band band) 5394 { 5395 int ac = ieee80211_ac_from_tid(tid); 5396 5397 skb_reset_mac_header(skb); 5398 skb_set_queue_mapping(skb, ac); 5399 skb->priority = tid; 5400 5401 skb->dev = sdata->dev; 5402 5403 /* 5404 * The other path calling ieee80211_xmit is from the tasklet, 5405 * and while we can handle concurrent transmissions locking 5406 * requirements are that we do not come into tx with bhs on. 5407 */ 5408 local_bh_disable(); 5409 IEEE80211_SKB_CB(skb)->band = band; 5410 ieee80211_xmit(sdata, NULL, skb); 5411 local_bh_enable(); 5412 } 5413 5414 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5415 const u8 *buf, size_t len, 5416 const u8 *dest, __be16 proto, bool unencrypted, 5417 u64 *cookie) 5418 { 5419 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5420 struct ieee80211_local *local = sdata->local; 5421 struct sk_buff *skb; 5422 struct ethhdr *ehdr; 5423 u32 ctrl_flags = 0; 5424 u32 flags = 0; 5425 5426 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5427 * or Pre-Authentication 5428 */ 5429 if (proto != sdata->control_port_protocol && 5430 proto != cpu_to_be16(ETH_P_PREAUTH)) 5431 return -EINVAL; 5432 5433 if (proto == sdata->control_port_protocol) 5434 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5435 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5436 5437 if (unencrypted) 5438 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5439 5440 if (cookie) 5441 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5442 5443 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX | 5444 IEEE80211_TX_CTL_INJECTED; 5445 5446 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5447 sizeof(struct ethhdr) + len); 5448 if (!skb) 5449 return -ENOMEM; 5450 5451 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5452 5453 skb_put_data(skb, buf, len); 5454 5455 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5456 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5457 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5458 ehdr->h_proto = proto; 5459 5460 skb->dev = dev; 5461 skb->protocol = htons(ETH_P_802_3); 5462 skb_reset_network_header(skb); 5463 skb_reset_mac_header(skb); 5464 5465 /* mutex lock is only needed for incrementing the cookie counter */ 5466 mutex_lock(&local->mtx); 5467 5468 local_bh_disable(); 5469 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5470 local_bh_enable(); 5471 5472 mutex_unlock(&local->mtx); 5473 5474 return 0; 5475 } 5476 5477 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5478 const u8 *buf, size_t len) 5479 { 5480 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5481 struct ieee80211_local *local = sdata->local; 5482 struct sk_buff *skb; 5483 5484 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5485 30 + /* header size */ 5486 18); /* 11s header size */ 5487 if (!skb) 5488 return -ENOMEM; 5489 5490 skb_reserve(skb, local->hw.extra_tx_headroom); 5491 skb_put_data(skb, buf, len); 5492 5493 skb->dev = dev; 5494 skb->protocol = htons(ETH_P_802_3); 5495 skb_reset_network_header(skb); 5496 skb_reset_mac_header(skb); 5497 5498 local_bh_disable(); 5499 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5500 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5501 NULL); 5502 local_bh_enable(); 5503 5504 return 0; 5505 } 5506