1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018-2020 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 42 { 43 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 44 45 u64_stats_update_begin(&tstats->syncp); 46 tstats->tx_packets++; 47 tstats->tx_bytes += len; 48 u64_stats_update_end(&tstats->syncp); 49 } 50 51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 52 struct sk_buff *skb, int group_addr, 53 int next_frag_len) 54 { 55 int rate, mrate, erp, dur, i, shift = 0; 56 struct ieee80211_rate *txrate; 57 struct ieee80211_local *local = tx->local; 58 struct ieee80211_supported_band *sband; 59 struct ieee80211_hdr *hdr; 60 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 61 struct ieee80211_chanctx_conf *chanctx_conf; 62 u32 rate_flags = 0; 63 64 /* assume HW handles this */ 65 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 66 return 0; 67 68 rcu_read_lock(); 69 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 70 if (chanctx_conf) { 71 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 72 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 73 } 74 rcu_read_unlock(); 75 76 /* uh huh? */ 77 if (WARN_ON_ONCE(tx->rate.idx < 0)) 78 return 0; 79 80 sband = local->hw.wiphy->bands[info->band]; 81 txrate = &sband->bitrates[tx->rate.idx]; 82 83 erp = txrate->flags & IEEE80211_RATE_ERP_G; 84 85 /* 86 * data and mgmt (except PS Poll): 87 * - during CFP: 32768 88 * - during contention period: 89 * if addr1 is group address: 0 90 * if more fragments = 0 and addr1 is individual address: time to 91 * transmit one ACK plus SIFS 92 * if more fragments = 1 and addr1 is individual address: time to 93 * transmit next fragment plus 2 x ACK plus 3 x SIFS 94 * 95 * IEEE 802.11, 9.6: 96 * - control response frame (CTS or ACK) shall be transmitted using the 97 * same rate as the immediately previous frame in the frame exchange 98 * sequence, if this rate belongs to the PHY mandatory rates, or else 99 * at the highest possible rate belonging to the PHY rates in the 100 * BSSBasicRateSet 101 */ 102 hdr = (struct ieee80211_hdr *)skb->data; 103 if (ieee80211_is_ctl(hdr->frame_control)) { 104 /* TODO: These control frames are not currently sent by 105 * mac80211, but should they be implemented, this function 106 * needs to be updated to support duration field calculation. 107 * 108 * RTS: time needed to transmit pending data/mgmt frame plus 109 * one CTS frame plus one ACK frame plus 3 x SIFS 110 * CTS: duration of immediately previous RTS minus time 111 * required to transmit CTS and its SIFS 112 * ACK: 0 if immediately previous directed data/mgmt had 113 * more=0, with more=1 duration in ACK frame is duration 114 * from previous frame minus time needed to transmit ACK 115 * and its SIFS 116 * PS Poll: BIT(15) | BIT(14) | aid 117 */ 118 return 0; 119 } 120 121 /* data/mgmt */ 122 if (0 /* FIX: data/mgmt during CFP */) 123 return cpu_to_le16(32768); 124 125 if (group_addr) /* Group address as the destination - no ACK */ 126 return 0; 127 128 /* Individual destination address: 129 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 130 * CTS and ACK frames shall be transmitted using the highest rate in 131 * basic rate set that is less than or equal to the rate of the 132 * immediately previous frame and that is using the same modulation 133 * (CCK or OFDM). If no basic rate set matches with these requirements, 134 * the highest mandatory rate of the PHY that is less than or equal to 135 * the rate of the previous frame is used. 136 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 137 */ 138 rate = -1; 139 /* use lowest available if everything fails */ 140 mrate = sband->bitrates[0].bitrate; 141 for (i = 0; i < sband->n_bitrates; i++) { 142 struct ieee80211_rate *r = &sband->bitrates[i]; 143 144 if (r->bitrate > txrate->bitrate) 145 break; 146 147 if ((rate_flags & r->flags) != rate_flags) 148 continue; 149 150 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 151 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 152 153 switch (sband->band) { 154 case NL80211_BAND_2GHZ: { 155 u32 flag; 156 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 157 flag = IEEE80211_RATE_MANDATORY_G; 158 else 159 flag = IEEE80211_RATE_MANDATORY_B; 160 if (r->flags & flag) 161 mrate = r->bitrate; 162 break; 163 } 164 case NL80211_BAND_5GHZ: 165 case NL80211_BAND_6GHZ: 166 if (r->flags & IEEE80211_RATE_MANDATORY_A) 167 mrate = r->bitrate; 168 break; 169 case NL80211_BAND_60GHZ: 170 /* TODO, for now fall through */ 171 case NUM_NL80211_BANDS: 172 WARN_ON(1); 173 break; 174 } 175 } 176 if (rate == -1) { 177 /* No matching basic rate found; use highest suitable mandatory 178 * PHY rate */ 179 rate = DIV_ROUND_UP(mrate, 1 << shift); 180 } 181 182 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 183 if (ieee80211_is_data_qos(hdr->frame_control) && 184 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 185 dur = 0; 186 else 187 /* Time needed to transmit ACK 188 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 189 * to closest integer */ 190 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 191 tx->sdata->vif.bss_conf.use_short_preamble, 192 shift); 193 194 if (next_frag_len) { 195 /* Frame is fragmented: duration increases with time needed to 196 * transmit next fragment plus ACK and 2 x SIFS. */ 197 dur *= 2; /* ACK + SIFS */ 198 /* next fragment */ 199 dur += ieee80211_frame_duration(sband->band, next_frag_len, 200 txrate->bitrate, erp, 201 tx->sdata->vif.bss_conf.use_short_preamble, 202 shift); 203 } 204 205 return cpu_to_le16(dur); 206 } 207 208 /* tx handlers */ 209 static ieee80211_tx_result debug_noinline 210 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 211 { 212 struct ieee80211_local *local = tx->local; 213 struct ieee80211_if_managed *ifmgd; 214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 215 216 /* driver doesn't support power save */ 217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 218 return TX_CONTINUE; 219 220 /* hardware does dynamic power save */ 221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 222 return TX_CONTINUE; 223 224 /* dynamic power save disabled */ 225 if (local->hw.conf.dynamic_ps_timeout <= 0) 226 return TX_CONTINUE; 227 228 /* we are scanning, don't enable power save */ 229 if (local->scanning) 230 return TX_CONTINUE; 231 232 if (!local->ps_sdata) 233 return TX_CONTINUE; 234 235 /* No point if we're going to suspend */ 236 if (local->quiescing) 237 return TX_CONTINUE; 238 239 /* dynamic ps is supported only in managed mode */ 240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 241 return TX_CONTINUE; 242 243 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 244 return TX_CONTINUE; 245 246 ifmgd = &tx->sdata->u.mgd; 247 248 /* 249 * Don't wakeup from power save if u-apsd is enabled, voip ac has 250 * u-apsd enabled and the frame is in voip class. This effectively 251 * means that even if all access categories have u-apsd enabled, in 252 * practise u-apsd is only used with the voip ac. This is a 253 * workaround for the case when received voip class packets do not 254 * have correct qos tag for some reason, due the network or the 255 * peer application. 256 * 257 * Note: ifmgd->uapsd_queues access is racy here. If the value is 258 * changed via debugfs, user needs to reassociate manually to have 259 * everything in sync. 260 */ 261 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 262 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 263 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 264 return TX_CONTINUE; 265 266 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 267 ieee80211_stop_queues_by_reason(&local->hw, 268 IEEE80211_MAX_QUEUE_MAP, 269 IEEE80211_QUEUE_STOP_REASON_PS, 270 false); 271 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 272 ieee80211_queue_work(&local->hw, 273 &local->dynamic_ps_disable_work); 274 } 275 276 /* Don't restart the timer if we're not disassociated */ 277 if (!ifmgd->associated) 278 return TX_CONTINUE; 279 280 mod_timer(&local->dynamic_ps_timer, jiffies + 281 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 282 283 return TX_CONTINUE; 284 } 285 286 static ieee80211_tx_result debug_noinline 287 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 288 { 289 290 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 291 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 292 bool assoc = false; 293 294 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 295 return TX_CONTINUE; 296 297 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 298 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 299 !ieee80211_is_probe_req(hdr->frame_control) && 300 !ieee80211_is_any_nullfunc(hdr->frame_control)) 301 /* 302 * When software scanning only nullfunc frames (to notify 303 * the sleep state to the AP) and probe requests (for the 304 * active scan) are allowed, all other frames should not be 305 * sent and we should not get here, but if we do 306 * nonetheless, drop them to avoid sending them 307 * off-channel. See the link below and 308 * ieee80211_start_scan() for more. 309 * 310 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 311 */ 312 return TX_DROP; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 315 return TX_CONTINUE; 316 317 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 318 return TX_CONTINUE; 319 320 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 321 return TX_CONTINUE; 322 323 if (tx->sta) 324 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 325 326 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 327 if (unlikely(!assoc && 328 ieee80211_is_data(hdr->frame_control))) { 329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 330 sdata_info(tx->sdata, 331 "dropped data frame to not associated station %pM\n", 332 hdr->addr1); 333 #endif 334 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 335 return TX_DROP; 336 } 337 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 338 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 339 /* 340 * No associated STAs - no need to send multicast 341 * frames. 342 */ 343 return TX_DROP; 344 } 345 346 return TX_CONTINUE; 347 } 348 349 /* This function is called whenever the AP is about to exceed the maximum limit 350 * of buffered frames for power saving STAs. This situation should not really 351 * happen often during normal operation, so dropping the oldest buffered packet 352 * from each queue should be OK to make some room for new frames. */ 353 static void purge_old_ps_buffers(struct ieee80211_local *local) 354 { 355 int total = 0, purged = 0; 356 struct sk_buff *skb; 357 struct ieee80211_sub_if_data *sdata; 358 struct sta_info *sta; 359 360 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 361 struct ps_data *ps; 362 363 if (sdata->vif.type == NL80211_IFTYPE_AP) 364 ps = &sdata->u.ap.ps; 365 else if (ieee80211_vif_is_mesh(&sdata->vif)) 366 ps = &sdata->u.mesh.ps; 367 else 368 continue; 369 370 skb = skb_dequeue(&ps->bc_buf); 371 if (skb) { 372 purged++; 373 ieee80211_free_txskb(&local->hw, skb); 374 } 375 total += skb_queue_len(&ps->bc_buf); 376 } 377 378 /* 379 * Drop one frame from each station from the lowest-priority 380 * AC that has frames at all. 381 */ 382 list_for_each_entry_rcu(sta, &local->sta_list, list) { 383 int ac; 384 385 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 386 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 387 total += skb_queue_len(&sta->ps_tx_buf[ac]); 388 if (skb) { 389 purged++; 390 ieee80211_free_txskb(&local->hw, skb); 391 break; 392 } 393 } 394 } 395 396 local->total_ps_buffered = total; 397 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 398 } 399 400 static ieee80211_tx_result 401 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 402 { 403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 404 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 405 struct ps_data *ps; 406 407 /* 408 * broadcast/multicast frame 409 * 410 * If any of the associated/peer stations is in power save mode, 411 * the frame is buffered to be sent after DTIM beacon frame. 412 * This is done either by the hardware or us. 413 */ 414 415 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 416 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 417 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 418 if (!tx->sdata->bss) 419 return TX_CONTINUE; 420 421 ps = &tx->sdata->bss->ps; 422 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 423 ps = &tx->sdata->u.mesh.ps; 424 } else { 425 return TX_CONTINUE; 426 } 427 428 429 /* no buffering for ordered frames */ 430 if (ieee80211_has_order(hdr->frame_control)) 431 return TX_CONTINUE; 432 433 if (ieee80211_is_probe_req(hdr->frame_control)) 434 return TX_CONTINUE; 435 436 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 437 info->hw_queue = tx->sdata->vif.cab_queue; 438 439 /* no stations in PS mode and no buffered packets */ 440 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 441 return TX_CONTINUE; 442 443 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 444 445 /* device releases frame after DTIM beacon */ 446 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 447 return TX_CONTINUE; 448 449 /* buffered in mac80211 */ 450 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 451 purge_old_ps_buffers(tx->local); 452 453 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 454 ps_dbg(tx->sdata, 455 "BC TX buffer full - dropping the oldest frame\n"); 456 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 457 } else 458 tx->local->total_ps_buffered++; 459 460 skb_queue_tail(&ps->bc_buf, tx->skb); 461 462 return TX_QUEUED; 463 } 464 465 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 466 struct sk_buff *skb) 467 { 468 if (!ieee80211_is_mgmt(fc)) 469 return 0; 470 471 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 472 return 0; 473 474 if (!ieee80211_is_robust_mgmt_frame(skb)) 475 return 0; 476 477 return 1; 478 } 479 480 static ieee80211_tx_result 481 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 482 { 483 struct sta_info *sta = tx->sta; 484 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 485 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 486 struct ieee80211_local *local = tx->local; 487 488 if (unlikely(!sta)) 489 return TX_CONTINUE; 490 491 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 492 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 493 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 494 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 495 int ac = skb_get_queue_mapping(tx->skb); 496 497 if (ieee80211_is_mgmt(hdr->frame_control) && 498 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 499 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 500 return TX_CONTINUE; 501 } 502 503 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 504 sta->sta.addr, sta->sta.aid, ac); 505 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 506 purge_old_ps_buffers(tx->local); 507 508 /* sync with ieee80211_sta_ps_deliver_wakeup */ 509 spin_lock(&sta->ps_lock); 510 /* 511 * STA woke up the meantime and all the frames on ps_tx_buf have 512 * been queued to pending queue. No reordering can happen, go 513 * ahead and Tx the packet. 514 */ 515 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 516 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 517 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 518 spin_unlock(&sta->ps_lock); 519 return TX_CONTINUE; 520 } 521 522 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 523 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 524 ps_dbg(tx->sdata, 525 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 526 sta->sta.addr, ac); 527 ieee80211_free_txskb(&local->hw, old); 528 } else 529 tx->local->total_ps_buffered++; 530 531 info->control.jiffies = jiffies; 532 info->control.vif = &tx->sdata->vif; 533 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 534 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 535 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 536 spin_unlock(&sta->ps_lock); 537 538 if (!timer_pending(&local->sta_cleanup)) 539 mod_timer(&local->sta_cleanup, 540 round_jiffies(jiffies + 541 STA_INFO_CLEANUP_INTERVAL)); 542 543 /* 544 * We queued up some frames, so the TIM bit might 545 * need to be set, recalculate it. 546 */ 547 sta_info_recalc_tim(sta); 548 549 return TX_QUEUED; 550 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 551 ps_dbg(tx->sdata, 552 "STA %pM in PS mode, but polling/in SP -> send frame\n", 553 sta->sta.addr); 554 } 555 556 return TX_CONTINUE; 557 } 558 559 static ieee80211_tx_result debug_noinline 560 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 561 { 562 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 563 return TX_CONTINUE; 564 565 if (tx->flags & IEEE80211_TX_UNICAST) 566 return ieee80211_tx_h_unicast_ps_buf(tx); 567 else 568 return ieee80211_tx_h_multicast_ps_buf(tx); 569 } 570 571 static ieee80211_tx_result debug_noinline 572 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 573 { 574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 575 576 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 577 if (tx->sdata->control_port_no_encrypt) 578 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 579 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 580 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 581 } 582 583 return TX_CONTINUE; 584 } 585 586 static ieee80211_tx_result debug_noinline 587 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 588 { 589 struct ieee80211_key *key; 590 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 591 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 592 593 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 594 tx->key = NULL; 595 return TX_CONTINUE; 596 } 597 598 if (tx->sta && 599 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 600 tx->key = key; 601 else if (ieee80211_is_group_privacy_action(tx->skb) && 602 (key = rcu_dereference(tx->sdata->default_multicast_key))) 603 tx->key = key; 604 else if (ieee80211_is_mgmt(hdr->frame_control) && 605 is_multicast_ether_addr(hdr->addr1) && 606 ieee80211_is_robust_mgmt_frame(tx->skb) && 607 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 608 tx->key = key; 609 else if (is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_multicast_key))) 611 tx->key = key; 612 else if (!is_multicast_ether_addr(hdr->addr1) && 613 (key = rcu_dereference(tx->sdata->default_unicast_key))) 614 tx->key = key; 615 else 616 tx->key = NULL; 617 618 if (tx->key) { 619 bool skip_hw = false; 620 621 /* TODO: add threshold stuff again */ 622 623 switch (tx->key->conf.cipher) { 624 case WLAN_CIPHER_SUITE_WEP40: 625 case WLAN_CIPHER_SUITE_WEP104: 626 case WLAN_CIPHER_SUITE_TKIP: 627 if (!ieee80211_is_data_present(hdr->frame_control)) 628 tx->key = NULL; 629 break; 630 case WLAN_CIPHER_SUITE_CCMP: 631 case WLAN_CIPHER_SUITE_CCMP_256: 632 case WLAN_CIPHER_SUITE_GCMP: 633 case WLAN_CIPHER_SUITE_GCMP_256: 634 if (!ieee80211_is_data_present(hdr->frame_control) && 635 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 636 tx->skb) && 637 !ieee80211_is_group_privacy_action(tx->skb)) 638 tx->key = NULL; 639 else 640 skip_hw = (tx->key->conf.flags & 641 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 642 ieee80211_is_mgmt(hdr->frame_control); 643 break; 644 case WLAN_CIPHER_SUITE_AES_CMAC: 645 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 646 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 647 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 648 if (!ieee80211_is_mgmt(hdr->frame_control)) 649 tx->key = NULL; 650 break; 651 } 652 653 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 654 !ieee80211_is_deauth(hdr->frame_control))) 655 return TX_DROP; 656 657 if (!skip_hw && tx->key && 658 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 659 info->control.hw_key = &tx->key->conf; 660 } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta && 661 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 662 return TX_DROP; 663 } 664 665 return TX_CONTINUE; 666 } 667 668 static ieee80211_tx_result debug_noinline 669 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 670 { 671 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 672 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 673 struct ieee80211_supported_band *sband; 674 u32 len; 675 struct ieee80211_tx_rate_control txrc; 676 struct ieee80211_sta_rates *ratetbl = NULL; 677 bool assoc = false; 678 679 memset(&txrc, 0, sizeof(txrc)); 680 681 sband = tx->local->hw.wiphy->bands[info->band]; 682 683 len = min_t(u32, tx->skb->len + FCS_LEN, 684 tx->local->hw.wiphy->frag_threshold); 685 686 /* set up the tx rate control struct we give the RC algo */ 687 txrc.hw = &tx->local->hw; 688 txrc.sband = sband; 689 txrc.bss_conf = &tx->sdata->vif.bss_conf; 690 txrc.skb = tx->skb; 691 txrc.reported_rate.idx = -1; 692 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 693 694 if (tx->sdata->rc_has_mcs_mask[info->band]) 695 txrc.rate_idx_mcs_mask = 696 tx->sdata->rc_rateidx_mcs_mask[info->band]; 697 698 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 699 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 700 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 701 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 702 703 /* set up RTS protection if desired */ 704 if (len > tx->local->hw.wiphy->rts_threshold) { 705 txrc.rts = true; 706 } 707 708 info->control.use_rts = txrc.rts; 709 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 710 711 /* 712 * Use short preamble if the BSS can handle it, but not for 713 * management frames unless we know the receiver can handle 714 * that -- the management frame might be to a station that 715 * just wants a probe response. 716 */ 717 if (tx->sdata->vif.bss_conf.use_short_preamble && 718 (ieee80211_is_data(hdr->frame_control) || 719 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 720 txrc.short_preamble = true; 721 722 info->control.short_preamble = txrc.short_preamble; 723 724 /* don't ask rate control when rate already injected via radiotap */ 725 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 726 return TX_CONTINUE; 727 728 if (tx->sta) 729 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 730 731 /* 732 * Lets not bother rate control if we're associated and cannot 733 * talk to the sta. This should not happen. 734 */ 735 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 736 !rate_usable_index_exists(sband, &tx->sta->sta), 737 "%s: Dropped data frame as no usable bitrate found while " 738 "scanning and associated. Target station: " 739 "%pM on %d GHz band\n", 740 tx->sdata->name, hdr->addr1, 741 info->band ? 5 : 2)) 742 return TX_DROP; 743 744 /* 745 * If we're associated with the sta at this point we know we can at 746 * least send the frame at the lowest bit rate. 747 */ 748 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 749 750 if (tx->sta && !info->control.skip_table) 751 ratetbl = rcu_dereference(tx->sta->sta.rates); 752 753 if (unlikely(info->control.rates[0].idx < 0)) { 754 if (ratetbl) { 755 struct ieee80211_tx_rate rate = { 756 .idx = ratetbl->rate[0].idx, 757 .flags = ratetbl->rate[0].flags, 758 .count = ratetbl->rate[0].count 759 }; 760 761 if (ratetbl->rate[0].idx < 0) 762 return TX_DROP; 763 764 tx->rate = rate; 765 } else { 766 return TX_DROP; 767 } 768 } else { 769 tx->rate = info->control.rates[0]; 770 } 771 772 if (txrc.reported_rate.idx < 0) { 773 txrc.reported_rate = tx->rate; 774 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 775 tx->sta->tx_stats.last_rate = txrc.reported_rate; 776 } else if (tx->sta) 777 tx->sta->tx_stats.last_rate = txrc.reported_rate; 778 779 if (ratetbl) 780 return TX_CONTINUE; 781 782 if (unlikely(!info->control.rates[0].count)) 783 info->control.rates[0].count = 1; 784 785 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 786 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 787 info->control.rates[0].count = 1; 788 789 return TX_CONTINUE; 790 } 791 792 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 793 { 794 u16 *seq = &sta->tid_seq[tid]; 795 __le16 ret = cpu_to_le16(*seq); 796 797 /* Increase the sequence number. */ 798 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 799 800 return ret; 801 } 802 803 static ieee80211_tx_result debug_noinline 804 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 805 { 806 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 807 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 808 int tid; 809 810 /* 811 * Packet injection may want to control the sequence 812 * number, if we have no matching interface then we 813 * neither assign one ourselves nor ask the driver to. 814 */ 815 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 816 return TX_CONTINUE; 817 818 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 819 return TX_CONTINUE; 820 821 if (ieee80211_hdrlen(hdr->frame_control) < 24) 822 return TX_CONTINUE; 823 824 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 825 return TX_CONTINUE; 826 827 /* 828 * Anything but QoS data that has a sequence number field 829 * (is long enough) gets a sequence number from the global 830 * counter. QoS data frames with a multicast destination 831 * also use the global counter (802.11-2012 9.3.2.10). 832 */ 833 if (!ieee80211_is_data_qos(hdr->frame_control) || 834 is_multicast_ether_addr(hdr->addr1)) { 835 if (tx->flags & IEEE80211_TX_NO_SEQNO) 836 return TX_CONTINUE; 837 /* driver should assign sequence number */ 838 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 839 /* for pure STA mode without beacons, we can do it */ 840 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 841 tx->sdata->sequence_number += 0x10; 842 if (tx->sta) 843 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 844 return TX_CONTINUE; 845 } 846 847 /* 848 * This should be true for injected/management frames only, for 849 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 850 * above since they are not QoS-data frames. 851 */ 852 if (!tx->sta) 853 return TX_CONTINUE; 854 855 /* include per-STA, per-TID sequence counter */ 856 tid = ieee80211_get_tid(hdr); 857 tx->sta->tx_stats.msdu[tid]++; 858 859 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 860 861 return TX_CONTINUE; 862 } 863 864 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 865 struct sk_buff *skb, int hdrlen, 866 int frag_threshold) 867 { 868 struct ieee80211_local *local = tx->local; 869 struct ieee80211_tx_info *info; 870 struct sk_buff *tmp; 871 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 872 int pos = hdrlen + per_fragm; 873 int rem = skb->len - hdrlen - per_fragm; 874 875 if (WARN_ON(rem < 0)) 876 return -EINVAL; 877 878 /* first fragment was already added to queue by caller */ 879 880 while (rem) { 881 int fraglen = per_fragm; 882 883 if (fraglen > rem) 884 fraglen = rem; 885 rem -= fraglen; 886 tmp = dev_alloc_skb(local->tx_headroom + 887 frag_threshold + 888 tx->sdata->encrypt_headroom + 889 IEEE80211_ENCRYPT_TAILROOM); 890 if (!tmp) 891 return -ENOMEM; 892 893 __skb_queue_tail(&tx->skbs, tmp); 894 895 skb_reserve(tmp, 896 local->tx_headroom + tx->sdata->encrypt_headroom); 897 898 /* copy control information */ 899 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 900 901 info = IEEE80211_SKB_CB(tmp); 902 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 903 IEEE80211_TX_CTL_FIRST_FRAGMENT); 904 905 if (rem) 906 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 907 908 skb_copy_queue_mapping(tmp, skb); 909 tmp->priority = skb->priority; 910 tmp->dev = skb->dev; 911 912 /* copy header and data */ 913 skb_put_data(tmp, skb->data, hdrlen); 914 skb_put_data(tmp, skb->data + pos, fraglen); 915 916 pos += fraglen; 917 } 918 919 /* adjust first fragment's length */ 920 skb_trim(skb, hdrlen + per_fragm); 921 return 0; 922 } 923 924 static ieee80211_tx_result debug_noinline 925 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 926 { 927 struct sk_buff *skb = tx->skb; 928 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 929 struct ieee80211_hdr *hdr = (void *)skb->data; 930 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 931 int hdrlen; 932 int fragnum; 933 934 /* no matter what happens, tx->skb moves to tx->skbs */ 935 __skb_queue_tail(&tx->skbs, skb); 936 tx->skb = NULL; 937 938 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 939 return TX_CONTINUE; 940 941 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 942 return TX_CONTINUE; 943 944 /* 945 * Warn when submitting a fragmented A-MPDU frame and drop it. 946 * This scenario is handled in ieee80211_tx_prepare but extra 947 * caution taken here as fragmented ampdu may cause Tx stop. 948 */ 949 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 950 return TX_DROP; 951 952 hdrlen = ieee80211_hdrlen(hdr->frame_control); 953 954 /* internal error, why isn't DONTFRAG set? */ 955 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 956 return TX_DROP; 957 958 /* 959 * Now fragment the frame. This will allocate all the fragments and 960 * chain them (using skb as the first fragment) to skb->next. 961 * During transmission, we will remove the successfully transmitted 962 * fragments from this list. When the low-level driver rejects one 963 * of the fragments then we will simply pretend to accept the skb 964 * but store it away as pending. 965 */ 966 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 967 return TX_DROP; 968 969 /* update duration/seq/flags of fragments */ 970 fragnum = 0; 971 972 skb_queue_walk(&tx->skbs, skb) { 973 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 974 975 hdr = (void *)skb->data; 976 info = IEEE80211_SKB_CB(skb); 977 978 if (!skb_queue_is_last(&tx->skbs, skb)) { 979 hdr->frame_control |= morefrags; 980 /* 981 * No multi-rate retries for fragmented frames, that 982 * would completely throw off the NAV at other STAs. 983 */ 984 info->control.rates[1].idx = -1; 985 info->control.rates[2].idx = -1; 986 info->control.rates[3].idx = -1; 987 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 988 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 989 } else { 990 hdr->frame_control &= ~morefrags; 991 } 992 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 993 fragnum++; 994 } 995 996 return TX_CONTINUE; 997 } 998 999 static ieee80211_tx_result debug_noinline 1000 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1001 { 1002 struct sk_buff *skb; 1003 int ac = -1; 1004 1005 if (!tx->sta) 1006 return TX_CONTINUE; 1007 1008 skb_queue_walk(&tx->skbs, skb) { 1009 ac = skb_get_queue_mapping(skb); 1010 tx->sta->tx_stats.bytes[ac] += skb->len; 1011 } 1012 if (ac >= 0) 1013 tx->sta->tx_stats.packets[ac]++; 1014 1015 return TX_CONTINUE; 1016 } 1017 1018 static ieee80211_tx_result debug_noinline 1019 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1020 { 1021 if (!tx->key) 1022 return TX_CONTINUE; 1023 1024 switch (tx->key->conf.cipher) { 1025 case WLAN_CIPHER_SUITE_WEP40: 1026 case WLAN_CIPHER_SUITE_WEP104: 1027 return ieee80211_crypto_wep_encrypt(tx); 1028 case WLAN_CIPHER_SUITE_TKIP: 1029 return ieee80211_crypto_tkip_encrypt(tx); 1030 case WLAN_CIPHER_SUITE_CCMP: 1031 return ieee80211_crypto_ccmp_encrypt( 1032 tx, IEEE80211_CCMP_MIC_LEN); 1033 case WLAN_CIPHER_SUITE_CCMP_256: 1034 return ieee80211_crypto_ccmp_encrypt( 1035 tx, IEEE80211_CCMP_256_MIC_LEN); 1036 case WLAN_CIPHER_SUITE_AES_CMAC: 1037 return ieee80211_crypto_aes_cmac_encrypt(tx); 1038 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1039 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1040 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1041 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1042 return ieee80211_crypto_aes_gmac_encrypt(tx); 1043 case WLAN_CIPHER_SUITE_GCMP: 1044 case WLAN_CIPHER_SUITE_GCMP_256: 1045 return ieee80211_crypto_gcmp_encrypt(tx); 1046 default: 1047 return ieee80211_crypto_hw_encrypt(tx); 1048 } 1049 1050 return TX_DROP; 1051 } 1052 1053 static ieee80211_tx_result debug_noinline 1054 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1055 { 1056 struct sk_buff *skb; 1057 struct ieee80211_hdr *hdr; 1058 int next_len; 1059 bool group_addr; 1060 1061 skb_queue_walk(&tx->skbs, skb) { 1062 hdr = (void *) skb->data; 1063 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1064 break; /* must not overwrite AID */ 1065 if (!skb_queue_is_last(&tx->skbs, skb)) { 1066 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1067 next_len = next->len; 1068 } else 1069 next_len = 0; 1070 group_addr = is_multicast_ether_addr(hdr->addr1); 1071 1072 hdr->duration_id = 1073 ieee80211_duration(tx, skb, group_addr, next_len); 1074 } 1075 1076 return TX_CONTINUE; 1077 } 1078 1079 /* actual transmit path */ 1080 1081 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1082 struct sk_buff *skb, 1083 struct ieee80211_tx_info *info, 1084 struct tid_ampdu_tx *tid_tx, 1085 int tid) 1086 { 1087 bool queued = false; 1088 bool reset_agg_timer = false; 1089 struct sk_buff *purge_skb = NULL; 1090 1091 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1092 info->flags |= IEEE80211_TX_CTL_AMPDU; 1093 reset_agg_timer = true; 1094 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1095 /* 1096 * nothing -- this aggregation session is being started 1097 * but that might still fail with the driver 1098 */ 1099 } else if (!tx->sta->sta.txq[tid]) { 1100 spin_lock(&tx->sta->lock); 1101 /* 1102 * Need to re-check now, because we may get here 1103 * 1104 * 1) in the window during which the setup is actually 1105 * already done, but not marked yet because not all 1106 * packets are spliced over to the driver pending 1107 * queue yet -- if this happened we acquire the lock 1108 * either before or after the splice happens, but 1109 * need to recheck which of these cases happened. 1110 * 1111 * 2) during session teardown, if the OPERATIONAL bit 1112 * was cleared due to the teardown but the pointer 1113 * hasn't been assigned NULL yet (or we loaded it 1114 * before it was assigned) -- in this case it may 1115 * now be NULL which means we should just let the 1116 * packet pass through because splicing the frames 1117 * back is already done. 1118 */ 1119 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1120 1121 if (!tid_tx) { 1122 /* do nothing, let packet pass through */ 1123 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1124 info->flags |= IEEE80211_TX_CTL_AMPDU; 1125 reset_agg_timer = true; 1126 } else { 1127 queued = true; 1128 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1129 clear_sta_flag(tx->sta, WLAN_STA_SP); 1130 ps_dbg(tx->sta->sdata, 1131 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1132 tx->sta->sta.addr, tx->sta->sta.aid); 1133 } 1134 info->control.vif = &tx->sdata->vif; 1135 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1136 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1137 __skb_queue_tail(&tid_tx->pending, skb); 1138 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1139 purge_skb = __skb_dequeue(&tid_tx->pending); 1140 } 1141 spin_unlock(&tx->sta->lock); 1142 1143 if (purge_skb) 1144 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1145 } 1146 1147 /* reset session timer */ 1148 if (reset_agg_timer) 1149 tid_tx->last_tx = jiffies; 1150 1151 return queued; 1152 } 1153 1154 /* 1155 * initialises @tx 1156 * pass %NULL for the station if unknown, a valid pointer if known 1157 * or an ERR_PTR() if the station is known not to exist 1158 */ 1159 static ieee80211_tx_result 1160 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1161 struct ieee80211_tx_data *tx, 1162 struct sta_info *sta, struct sk_buff *skb) 1163 { 1164 struct ieee80211_local *local = sdata->local; 1165 struct ieee80211_hdr *hdr; 1166 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1167 int tid; 1168 1169 memset(tx, 0, sizeof(*tx)); 1170 tx->skb = skb; 1171 tx->local = local; 1172 tx->sdata = sdata; 1173 __skb_queue_head_init(&tx->skbs); 1174 1175 /* 1176 * If this flag is set to true anywhere, and we get here, 1177 * we are doing the needed processing, so remove the flag 1178 * now. 1179 */ 1180 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1181 1182 hdr = (struct ieee80211_hdr *) skb->data; 1183 1184 if (likely(sta)) { 1185 if (!IS_ERR(sta)) 1186 tx->sta = sta; 1187 } else { 1188 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1189 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1190 if (!tx->sta && sdata->wdev.use_4addr) 1191 return TX_DROP; 1192 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1193 IEEE80211_TX_CTL_INJECTED) || 1194 tx->sdata->control_port_protocol == tx->skb->protocol) { 1195 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1196 } 1197 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1198 tx->sta = sta_info_get(sdata, hdr->addr1); 1199 } 1200 1201 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1202 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1203 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1204 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1205 struct tid_ampdu_tx *tid_tx; 1206 1207 tid = ieee80211_get_tid(hdr); 1208 1209 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1210 if (tid_tx) { 1211 bool queued; 1212 1213 queued = ieee80211_tx_prep_agg(tx, skb, info, 1214 tid_tx, tid); 1215 1216 if (unlikely(queued)) 1217 return TX_QUEUED; 1218 } 1219 } 1220 1221 if (is_multicast_ether_addr(hdr->addr1)) { 1222 tx->flags &= ~IEEE80211_TX_UNICAST; 1223 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1224 } else 1225 tx->flags |= IEEE80211_TX_UNICAST; 1226 1227 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1228 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1229 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1230 info->flags & IEEE80211_TX_CTL_AMPDU) 1231 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1232 } 1233 1234 if (!tx->sta) 1235 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1236 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1237 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1238 ieee80211_check_fast_xmit(tx->sta); 1239 } 1240 1241 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1242 1243 return TX_CONTINUE; 1244 } 1245 1246 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1247 struct ieee80211_vif *vif, 1248 struct sta_info *sta, 1249 struct sk_buff *skb) 1250 { 1251 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1252 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1253 struct ieee80211_txq *txq = NULL; 1254 1255 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1256 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1257 return NULL; 1258 1259 if (!(info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) && 1260 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1261 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1262 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1263 vif->type == NL80211_IFTYPE_STATION) && 1264 sta && sta->uploaded) { 1265 /* 1266 * This will be NULL if the driver didn't set the 1267 * opt-in hardware flag. 1268 */ 1269 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1270 } 1271 } else if (sta) { 1272 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1273 1274 if (!sta->uploaded) 1275 return NULL; 1276 1277 txq = sta->sta.txq[tid]; 1278 } else if (vif) { 1279 txq = vif->txq; 1280 } 1281 1282 if (!txq) 1283 return NULL; 1284 1285 return to_txq_info(txq); 1286 } 1287 1288 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1289 { 1290 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1291 } 1292 1293 static u32 codel_skb_len_func(const struct sk_buff *skb) 1294 { 1295 return skb->len; 1296 } 1297 1298 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1299 { 1300 const struct ieee80211_tx_info *info; 1301 1302 info = (const struct ieee80211_tx_info *)skb->cb; 1303 return info->control.enqueue_time; 1304 } 1305 1306 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1307 void *ctx) 1308 { 1309 struct ieee80211_local *local; 1310 struct txq_info *txqi; 1311 struct fq *fq; 1312 struct fq_flow *flow; 1313 1314 txqi = ctx; 1315 local = vif_to_sdata(txqi->txq.vif)->local; 1316 fq = &local->fq; 1317 1318 if (cvars == &txqi->def_cvars) 1319 flow = &txqi->def_flow; 1320 else 1321 flow = &fq->flows[cvars - local->cvars]; 1322 1323 return fq_flow_dequeue(fq, flow); 1324 } 1325 1326 static void codel_drop_func(struct sk_buff *skb, 1327 void *ctx) 1328 { 1329 struct ieee80211_local *local; 1330 struct ieee80211_hw *hw; 1331 struct txq_info *txqi; 1332 1333 txqi = ctx; 1334 local = vif_to_sdata(txqi->txq.vif)->local; 1335 hw = &local->hw; 1336 1337 ieee80211_free_txskb(hw, skb); 1338 } 1339 1340 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1341 struct fq_tin *tin, 1342 struct fq_flow *flow) 1343 { 1344 struct ieee80211_local *local; 1345 struct txq_info *txqi; 1346 struct codel_vars *cvars; 1347 struct codel_params *cparams; 1348 struct codel_stats *cstats; 1349 1350 local = container_of(fq, struct ieee80211_local, fq); 1351 txqi = container_of(tin, struct txq_info, tin); 1352 cstats = &txqi->cstats; 1353 1354 if (txqi->txq.sta) { 1355 struct sta_info *sta = container_of(txqi->txq.sta, 1356 struct sta_info, sta); 1357 cparams = &sta->cparams; 1358 } else { 1359 cparams = &local->cparams; 1360 } 1361 1362 if (flow == &txqi->def_flow) 1363 cvars = &txqi->def_cvars; 1364 else 1365 cvars = &local->cvars[flow - fq->flows]; 1366 1367 return codel_dequeue(txqi, 1368 &flow->backlog, 1369 cparams, 1370 cvars, 1371 cstats, 1372 codel_skb_len_func, 1373 codel_skb_time_func, 1374 codel_drop_func, 1375 codel_dequeue_func); 1376 } 1377 1378 static void fq_skb_free_func(struct fq *fq, 1379 struct fq_tin *tin, 1380 struct fq_flow *flow, 1381 struct sk_buff *skb) 1382 { 1383 struct ieee80211_local *local; 1384 1385 local = container_of(fq, struct ieee80211_local, fq); 1386 ieee80211_free_txskb(&local->hw, skb); 1387 } 1388 1389 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1390 struct fq_tin *tin, 1391 int idx, 1392 struct sk_buff *skb) 1393 { 1394 struct txq_info *txqi; 1395 1396 txqi = container_of(tin, struct txq_info, tin); 1397 return &txqi->def_flow; 1398 } 1399 1400 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1401 struct txq_info *txqi, 1402 struct sk_buff *skb) 1403 { 1404 struct fq *fq = &local->fq; 1405 struct fq_tin *tin = &txqi->tin; 1406 u32 flow_idx = fq_flow_idx(fq, skb); 1407 1408 ieee80211_set_skb_enqueue_time(skb); 1409 1410 spin_lock_bh(&fq->lock); 1411 fq_tin_enqueue(fq, tin, flow_idx, skb, 1412 fq_skb_free_func, 1413 fq_flow_get_default_func); 1414 spin_unlock_bh(&fq->lock); 1415 } 1416 1417 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1418 struct fq_flow *flow, struct sk_buff *skb, 1419 void *data) 1420 { 1421 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1422 1423 return info->control.vif == data; 1424 } 1425 1426 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1427 struct ieee80211_sub_if_data *sdata) 1428 { 1429 struct fq *fq = &local->fq; 1430 struct txq_info *txqi; 1431 struct fq_tin *tin; 1432 struct ieee80211_sub_if_data *ap; 1433 1434 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1435 return; 1436 1437 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1438 1439 if (!ap->vif.txq) 1440 return; 1441 1442 txqi = to_txq_info(ap->vif.txq); 1443 tin = &txqi->tin; 1444 1445 spin_lock_bh(&fq->lock); 1446 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1447 fq_skb_free_func); 1448 spin_unlock_bh(&fq->lock); 1449 } 1450 1451 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1452 struct sta_info *sta, 1453 struct txq_info *txqi, int tid) 1454 { 1455 fq_tin_init(&txqi->tin); 1456 fq_flow_init(&txqi->def_flow); 1457 codel_vars_init(&txqi->def_cvars); 1458 codel_stats_init(&txqi->cstats); 1459 __skb_queue_head_init(&txqi->frags); 1460 INIT_LIST_HEAD(&txqi->schedule_order); 1461 1462 txqi->txq.vif = &sdata->vif; 1463 1464 if (!sta) { 1465 sdata->vif.txq = &txqi->txq; 1466 txqi->txq.tid = 0; 1467 txqi->txq.ac = IEEE80211_AC_BE; 1468 1469 return; 1470 } 1471 1472 if (tid == IEEE80211_NUM_TIDS) { 1473 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1474 /* Drivers need to opt in to the management MPDU TXQ */ 1475 if (!ieee80211_hw_check(&sdata->local->hw, 1476 STA_MMPDU_TXQ)) 1477 return; 1478 } else if (!ieee80211_hw_check(&sdata->local->hw, 1479 BUFF_MMPDU_TXQ)) { 1480 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1481 return; 1482 } 1483 txqi->txq.ac = IEEE80211_AC_VO; 1484 } else { 1485 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1486 } 1487 1488 txqi->txq.sta = &sta->sta; 1489 txqi->txq.tid = tid; 1490 sta->sta.txq[tid] = &txqi->txq; 1491 } 1492 1493 void ieee80211_txq_purge(struct ieee80211_local *local, 1494 struct txq_info *txqi) 1495 { 1496 struct fq *fq = &local->fq; 1497 struct fq_tin *tin = &txqi->tin; 1498 1499 spin_lock_bh(&fq->lock); 1500 fq_tin_reset(fq, tin, fq_skb_free_func); 1501 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1502 spin_unlock_bh(&fq->lock); 1503 1504 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1505 list_del_init(&txqi->schedule_order); 1506 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1507 } 1508 1509 void ieee80211_txq_set_params(struct ieee80211_local *local) 1510 { 1511 if (local->hw.wiphy->txq_limit) 1512 local->fq.limit = local->hw.wiphy->txq_limit; 1513 else 1514 local->hw.wiphy->txq_limit = local->fq.limit; 1515 1516 if (local->hw.wiphy->txq_memory_limit) 1517 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1518 else 1519 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1520 1521 if (local->hw.wiphy->txq_quantum) 1522 local->fq.quantum = local->hw.wiphy->txq_quantum; 1523 else 1524 local->hw.wiphy->txq_quantum = local->fq.quantum; 1525 } 1526 1527 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1528 { 1529 struct fq *fq = &local->fq; 1530 int ret; 1531 int i; 1532 bool supp_vht = false; 1533 enum nl80211_band band; 1534 1535 if (!local->ops->wake_tx_queue) 1536 return 0; 1537 1538 ret = fq_init(fq, 4096); 1539 if (ret) 1540 return ret; 1541 1542 /* 1543 * If the hardware doesn't support VHT, it is safe to limit the maximum 1544 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1545 */ 1546 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1547 struct ieee80211_supported_band *sband; 1548 1549 sband = local->hw.wiphy->bands[band]; 1550 if (!sband) 1551 continue; 1552 1553 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1554 } 1555 1556 if (!supp_vht) 1557 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1558 1559 codel_params_init(&local->cparams); 1560 local->cparams.interval = MS2TIME(100); 1561 local->cparams.target = MS2TIME(20); 1562 local->cparams.ecn = true; 1563 1564 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1565 GFP_KERNEL); 1566 if (!local->cvars) { 1567 spin_lock_bh(&fq->lock); 1568 fq_reset(fq, fq_skb_free_func); 1569 spin_unlock_bh(&fq->lock); 1570 return -ENOMEM; 1571 } 1572 1573 for (i = 0; i < fq->flows_cnt; i++) 1574 codel_vars_init(&local->cvars[i]); 1575 1576 ieee80211_txq_set_params(local); 1577 1578 return 0; 1579 } 1580 1581 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1582 { 1583 struct fq *fq = &local->fq; 1584 1585 if (!local->ops->wake_tx_queue) 1586 return; 1587 1588 kfree(local->cvars); 1589 local->cvars = NULL; 1590 1591 spin_lock_bh(&fq->lock); 1592 fq_reset(fq, fq_skb_free_func); 1593 spin_unlock_bh(&fq->lock); 1594 } 1595 1596 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1597 struct ieee80211_sub_if_data *sdata, 1598 struct sta_info *sta, 1599 struct sk_buff *skb) 1600 { 1601 struct ieee80211_vif *vif; 1602 struct txq_info *txqi; 1603 1604 if (!local->ops->wake_tx_queue || 1605 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1606 return false; 1607 1608 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1609 sdata = container_of(sdata->bss, 1610 struct ieee80211_sub_if_data, u.ap); 1611 1612 vif = &sdata->vif; 1613 txqi = ieee80211_get_txq(local, vif, sta, skb); 1614 1615 if (!txqi) 1616 return false; 1617 1618 ieee80211_txq_enqueue(local, txqi, skb); 1619 1620 schedule_and_wake_txq(local, txqi); 1621 1622 return true; 1623 } 1624 1625 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1626 struct ieee80211_vif *vif, 1627 struct sta_info *sta, 1628 struct sk_buff_head *skbs, 1629 bool txpending) 1630 { 1631 struct ieee80211_tx_control control = {}; 1632 struct sk_buff *skb, *tmp; 1633 unsigned long flags; 1634 1635 skb_queue_walk_safe(skbs, skb, tmp) { 1636 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1637 int q = info->hw_queue; 1638 1639 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1640 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1641 __skb_unlink(skb, skbs); 1642 ieee80211_free_txskb(&local->hw, skb); 1643 continue; 1644 } 1645 #endif 1646 1647 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1648 if (local->queue_stop_reasons[q] || 1649 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1650 if (unlikely(info->flags & 1651 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1652 if (local->queue_stop_reasons[q] & 1653 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1654 /* 1655 * Drop off-channel frames if queues 1656 * are stopped for any reason other 1657 * than off-channel operation. Never 1658 * queue them. 1659 */ 1660 spin_unlock_irqrestore( 1661 &local->queue_stop_reason_lock, 1662 flags); 1663 ieee80211_purge_tx_queue(&local->hw, 1664 skbs); 1665 return true; 1666 } 1667 } else { 1668 1669 /* 1670 * Since queue is stopped, queue up frames for 1671 * later transmission from the tx-pending 1672 * tasklet when the queue is woken again. 1673 */ 1674 if (txpending) 1675 skb_queue_splice_init(skbs, 1676 &local->pending[q]); 1677 else 1678 skb_queue_splice_tail_init(skbs, 1679 &local->pending[q]); 1680 1681 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1682 flags); 1683 return false; 1684 } 1685 } 1686 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1687 1688 info->control.vif = vif; 1689 control.sta = sta ? &sta->sta : NULL; 1690 1691 __skb_unlink(skb, skbs); 1692 drv_tx(local, &control, skb); 1693 } 1694 1695 return true; 1696 } 1697 1698 /* 1699 * Returns false if the frame couldn't be transmitted but was queued instead. 1700 */ 1701 static bool __ieee80211_tx(struct ieee80211_local *local, 1702 struct sk_buff_head *skbs, int led_len, 1703 struct sta_info *sta, bool txpending) 1704 { 1705 struct ieee80211_tx_info *info; 1706 struct ieee80211_sub_if_data *sdata; 1707 struct ieee80211_vif *vif; 1708 struct sk_buff *skb; 1709 bool result = true; 1710 __le16 fc; 1711 1712 if (WARN_ON(skb_queue_empty(skbs))) 1713 return true; 1714 1715 skb = skb_peek(skbs); 1716 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1717 info = IEEE80211_SKB_CB(skb); 1718 sdata = vif_to_sdata(info->control.vif); 1719 if (sta && !sta->uploaded) 1720 sta = NULL; 1721 1722 switch (sdata->vif.type) { 1723 case NL80211_IFTYPE_MONITOR: 1724 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1725 vif = &sdata->vif; 1726 break; 1727 } 1728 sdata = rcu_dereference(local->monitor_sdata); 1729 if (sdata) { 1730 vif = &sdata->vif; 1731 info->hw_queue = 1732 vif->hw_queue[skb_get_queue_mapping(skb)]; 1733 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1734 ieee80211_purge_tx_queue(&local->hw, skbs); 1735 return true; 1736 } else 1737 vif = NULL; 1738 break; 1739 case NL80211_IFTYPE_AP_VLAN: 1740 sdata = container_of(sdata->bss, 1741 struct ieee80211_sub_if_data, u.ap); 1742 /* fall through */ 1743 default: 1744 vif = &sdata->vif; 1745 break; 1746 } 1747 1748 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1749 1750 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1751 1752 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1753 1754 return result; 1755 } 1756 1757 /* 1758 * Invoke TX handlers, return 0 on success and non-zero if the 1759 * frame was dropped or queued. 1760 * 1761 * The handlers are split into an early and late part. The latter is everything 1762 * that can be sensitive to reordering, and will be deferred to after packets 1763 * are dequeued from the intermediate queues (when they are enabled). 1764 */ 1765 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1766 { 1767 ieee80211_tx_result res = TX_DROP; 1768 1769 #define CALL_TXH(txh) \ 1770 do { \ 1771 res = txh(tx); \ 1772 if (res != TX_CONTINUE) \ 1773 goto txh_done; \ 1774 } while (0) 1775 1776 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1777 CALL_TXH(ieee80211_tx_h_check_assoc); 1778 CALL_TXH(ieee80211_tx_h_ps_buf); 1779 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1780 CALL_TXH(ieee80211_tx_h_select_key); 1781 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1782 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1783 1784 txh_done: 1785 if (unlikely(res == TX_DROP)) { 1786 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1787 if (tx->skb) 1788 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1789 else 1790 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1791 return -1; 1792 } else if (unlikely(res == TX_QUEUED)) { 1793 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1794 return -1; 1795 } 1796 1797 return 0; 1798 } 1799 1800 /* 1801 * Late handlers can be called while the sta lock is held. Handlers that can 1802 * cause packets to be generated will cause deadlock! 1803 */ 1804 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1805 { 1806 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1807 ieee80211_tx_result res = TX_CONTINUE; 1808 1809 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1810 __skb_queue_tail(&tx->skbs, tx->skb); 1811 tx->skb = NULL; 1812 goto txh_done; 1813 } 1814 1815 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1816 CALL_TXH(ieee80211_tx_h_sequence); 1817 CALL_TXH(ieee80211_tx_h_fragment); 1818 /* handlers after fragment must be aware of tx info fragmentation! */ 1819 CALL_TXH(ieee80211_tx_h_stats); 1820 CALL_TXH(ieee80211_tx_h_encrypt); 1821 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1822 CALL_TXH(ieee80211_tx_h_calculate_duration); 1823 #undef CALL_TXH 1824 1825 txh_done: 1826 if (unlikely(res == TX_DROP)) { 1827 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1828 if (tx->skb) 1829 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1830 else 1831 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1832 return -1; 1833 } else if (unlikely(res == TX_QUEUED)) { 1834 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1835 return -1; 1836 } 1837 1838 return 0; 1839 } 1840 1841 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1842 { 1843 int r = invoke_tx_handlers_early(tx); 1844 1845 if (r) 1846 return r; 1847 return invoke_tx_handlers_late(tx); 1848 } 1849 1850 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1851 struct ieee80211_vif *vif, struct sk_buff *skb, 1852 int band, struct ieee80211_sta **sta) 1853 { 1854 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1855 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1856 struct ieee80211_tx_data tx; 1857 struct sk_buff *skb2; 1858 1859 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1860 return false; 1861 1862 info->band = band; 1863 info->control.vif = vif; 1864 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1865 1866 if (invoke_tx_handlers(&tx)) 1867 return false; 1868 1869 if (sta) { 1870 if (tx.sta) 1871 *sta = &tx.sta->sta; 1872 else 1873 *sta = NULL; 1874 } 1875 1876 /* this function isn't suitable for fragmented data frames */ 1877 skb2 = __skb_dequeue(&tx.skbs); 1878 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1879 ieee80211_free_txskb(hw, skb2); 1880 ieee80211_purge_tx_queue(hw, &tx.skbs); 1881 return false; 1882 } 1883 1884 return true; 1885 } 1886 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1887 1888 /* 1889 * Returns false if the frame couldn't be transmitted but was queued instead. 1890 */ 1891 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1892 struct sta_info *sta, struct sk_buff *skb, 1893 bool txpending, u32 txdata_flags) 1894 { 1895 struct ieee80211_local *local = sdata->local; 1896 struct ieee80211_tx_data tx; 1897 ieee80211_tx_result res_prepare; 1898 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1899 bool result = true; 1900 int led_len; 1901 1902 if (unlikely(skb->len < 10)) { 1903 dev_kfree_skb(skb); 1904 return true; 1905 } 1906 1907 /* initialises tx */ 1908 led_len = skb->len; 1909 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1910 1911 tx.flags |= txdata_flags; 1912 1913 if (unlikely(res_prepare == TX_DROP)) { 1914 ieee80211_free_txskb(&local->hw, skb); 1915 return true; 1916 } else if (unlikely(res_prepare == TX_QUEUED)) { 1917 return true; 1918 } 1919 1920 /* set up hw_queue value early */ 1921 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1922 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1923 info->hw_queue = 1924 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1925 1926 if (invoke_tx_handlers_early(&tx)) 1927 return true; 1928 1929 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1930 return true; 1931 1932 if (!invoke_tx_handlers_late(&tx)) 1933 result = __ieee80211_tx(local, &tx.skbs, led_len, 1934 tx.sta, txpending); 1935 1936 return result; 1937 } 1938 1939 /* device xmit handlers */ 1940 1941 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1942 struct sk_buff *skb, 1943 int head_need, bool may_encrypt) 1944 { 1945 struct ieee80211_local *local = sdata->local; 1946 struct ieee80211_hdr *hdr; 1947 bool enc_tailroom; 1948 int tail_need = 0; 1949 1950 hdr = (struct ieee80211_hdr *) skb->data; 1951 enc_tailroom = may_encrypt && 1952 (sdata->crypto_tx_tailroom_needed_cnt || 1953 ieee80211_is_mgmt(hdr->frame_control)); 1954 1955 if (enc_tailroom) { 1956 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1957 tail_need -= skb_tailroom(skb); 1958 tail_need = max_t(int, tail_need, 0); 1959 } 1960 1961 if (skb_cloned(skb) && 1962 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1963 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1964 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1965 else if (head_need || tail_need) 1966 I802_DEBUG_INC(local->tx_expand_skb_head); 1967 else 1968 return 0; 1969 1970 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1971 wiphy_debug(local->hw.wiphy, 1972 "failed to reallocate TX buffer\n"); 1973 return -ENOMEM; 1974 } 1975 1976 return 0; 1977 } 1978 1979 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1980 struct sta_info *sta, struct sk_buff *skb, 1981 u32 txdata_flags) 1982 { 1983 struct ieee80211_local *local = sdata->local; 1984 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1985 struct ieee80211_hdr *hdr; 1986 int headroom; 1987 bool may_encrypt; 1988 1989 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1990 1991 headroom = local->tx_headroom; 1992 if (may_encrypt) 1993 headroom += sdata->encrypt_headroom; 1994 headroom -= skb_headroom(skb); 1995 headroom = max_t(int, 0, headroom); 1996 1997 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1998 ieee80211_free_txskb(&local->hw, skb); 1999 return; 2000 } 2001 2002 hdr = (struct ieee80211_hdr *) skb->data; 2003 info->control.vif = &sdata->vif; 2004 2005 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2006 if (ieee80211_is_data(hdr->frame_control) && 2007 is_unicast_ether_addr(hdr->addr1)) { 2008 if (mesh_nexthop_resolve(sdata, skb)) 2009 return; /* skb queued: don't free */ 2010 } else { 2011 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2012 } 2013 } 2014 2015 ieee80211_set_qos_hdr(sdata, skb); 2016 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 2017 } 2018 2019 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 2020 struct sk_buff *skb) 2021 { 2022 struct ieee80211_radiotap_iterator iterator; 2023 struct ieee80211_radiotap_header *rthdr = 2024 (struct ieee80211_radiotap_header *) skb->data; 2025 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2026 struct ieee80211_supported_band *sband = 2027 local->hw.wiphy->bands[info->band]; 2028 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2029 NULL); 2030 u16 txflags; 2031 u16 rate = 0; 2032 bool rate_found = false; 2033 u8 rate_retries = 0; 2034 u16 rate_flags = 0; 2035 u8 mcs_known, mcs_flags, mcs_bw; 2036 u16 vht_known; 2037 u8 vht_mcs = 0, vht_nss = 0; 2038 int i; 2039 2040 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2041 IEEE80211_TX_CTL_DONTFRAG; 2042 2043 /* 2044 * for every radiotap entry that is present 2045 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2046 * entries present, or -EINVAL on error) 2047 */ 2048 2049 while (!ret) { 2050 ret = ieee80211_radiotap_iterator_next(&iterator); 2051 2052 if (ret) 2053 continue; 2054 2055 /* see if this argument is something we can use */ 2056 switch (iterator.this_arg_index) { 2057 /* 2058 * You must take care when dereferencing iterator.this_arg 2059 * for multibyte types... the pointer is not aligned. Use 2060 * get_unaligned((type *)iterator.this_arg) to dereference 2061 * iterator.this_arg for type "type" safely on all arches. 2062 */ 2063 case IEEE80211_RADIOTAP_FLAGS: 2064 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2065 /* 2066 * this indicates that the skb we have been 2067 * handed has the 32-bit FCS CRC at the end... 2068 * we should react to that by snipping it off 2069 * because it will be recomputed and added 2070 * on transmission 2071 */ 2072 if (skb->len < (iterator._max_length + FCS_LEN)) 2073 return false; 2074 2075 skb_trim(skb, skb->len - FCS_LEN); 2076 } 2077 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2078 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2079 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2080 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2081 break; 2082 2083 case IEEE80211_RADIOTAP_TX_FLAGS: 2084 txflags = get_unaligned_le16(iterator.this_arg); 2085 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2086 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2087 break; 2088 2089 case IEEE80211_RADIOTAP_RATE: 2090 rate = *iterator.this_arg; 2091 rate_flags = 0; 2092 rate_found = true; 2093 break; 2094 2095 case IEEE80211_RADIOTAP_DATA_RETRIES: 2096 rate_retries = *iterator.this_arg; 2097 break; 2098 2099 case IEEE80211_RADIOTAP_MCS: 2100 mcs_known = iterator.this_arg[0]; 2101 mcs_flags = iterator.this_arg[1]; 2102 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2103 break; 2104 2105 rate_found = true; 2106 rate = iterator.this_arg[2]; 2107 rate_flags = IEEE80211_TX_RC_MCS; 2108 2109 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2110 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2111 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2112 2113 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2114 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2115 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2116 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2117 break; 2118 2119 case IEEE80211_RADIOTAP_VHT: 2120 vht_known = get_unaligned_le16(iterator.this_arg); 2121 rate_found = true; 2122 2123 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2124 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2125 (iterator.this_arg[2] & 2126 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2127 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2128 if (vht_known & 2129 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2130 if (iterator.this_arg[3] == 1) 2131 rate_flags |= 2132 IEEE80211_TX_RC_40_MHZ_WIDTH; 2133 else if (iterator.this_arg[3] == 4) 2134 rate_flags |= 2135 IEEE80211_TX_RC_80_MHZ_WIDTH; 2136 else if (iterator.this_arg[3] == 11) 2137 rate_flags |= 2138 IEEE80211_TX_RC_160_MHZ_WIDTH; 2139 } 2140 2141 vht_mcs = iterator.this_arg[4] >> 4; 2142 vht_nss = iterator.this_arg[4] & 0xF; 2143 break; 2144 2145 /* 2146 * Please update the file 2147 * Documentation/networking/mac80211-injection.txt 2148 * when parsing new fields here. 2149 */ 2150 2151 default: 2152 break; 2153 } 2154 } 2155 2156 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2157 return false; 2158 2159 if (rate_found) { 2160 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2161 2162 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2163 info->control.rates[i].idx = -1; 2164 info->control.rates[i].flags = 0; 2165 info->control.rates[i].count = 0; 2166 } 2167 2168 if (rate_flags & IEEE80211_TX_RC_MCS) { 2169 info->control.rates[0].idx = rate; 2170 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2171 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2172 vht_nss); 2173 } else { 2174 for (i = 0; i < sband->n_bitrates; i++) { 2175 if (rate * 5 != sband->bitrates[i].bitrate) 2176 continue; 2177 2178 info->control.rates[0].idx = i; 2179 break; 2180 } 2181 } 2182 2183 if (info->control.rates[0].idx < 0) 2184 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2185 2186 info->control.rates[0].flags = rate_flags; 2187 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2188 local->hw.max_rate_tries); 2189 } 2190 2191 /* 2192 * remove the radiotap header 2193 * iterator->_max_length was sanity-checked against 2194 * skb->len by iterator init 2195 */ 2196 skb_pull(skb, iterator._max_length); 2197 2198 return true; 2199 } 2200 2201 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2202 struct net_device *dev) 2203 { 2204 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2205 struct ieee80211_chanctx_conf *chanctx_conf; 2206 struct ieee80211_radiotap_header *prthdr = 2207 (struct ieee80211_radiotap_header *)skb->data; 2208 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2209 struct ieee80211_hdr *hdr; 2210 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2211 struct cfg80211_chan_def *chandef; 2212 u16 len_rthdr; 2213 int hdrlen; 2214 2215 /* check for not even having the fixed radiotap header part */ 2216 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2217 goto fail; /* too short to be possibly valid */ 2218 2219 /* is it a header version we can trust to find length from? */ 2220 if (unlikely(prthdr->it_version)) 2221 goto fail; /* only version 0 is supported */ 2222 2223 /* then there must be a radiotap header with a length we can use */ 2224 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2225 2226 /* does the skb contain enough to deliver on the alleged length? */ 2227 if (unlikely(skb->len < len_rthdr)) 2228 goto fail; /* skb too short for claimed rt header extent */ 2229 2230 /* 2231 * fix up the pointers accounting for the radiotap 2232 * header still being in there. We are being given 2233 * a precooked IEEE80211 header so no need for 2234 * normal processing 2235 */ 2236 skb_set_mac_header(skb, len_rthdr); 2237 /* 2238 * these are just fixed to the end of the rt area since we 2239 * don't have any better information and at this point, nobody cares 2240 */ 2241 skb_set_network_header(skb, len_rthdr); 2242 skb_set_transport_header(skb, len_rthdr); 2243 2244 if (skb->len < len_rthdr + 2) 2245 goto fail; 2246 2247 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2248 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2249 2250 if (skb->len < len_rthdr + hdrlen) 2251 goto fail; 2252 2253 /* 2254 * Initialize skb->protocol if the injected frame is a data frame 2255 * carrying a rfc1042 header 2256 */ 2257 if (ieee80211_is_data(hdr->frame_control) && 2258 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2259 u8 *payload = (u8 *)hdr + hdrlen; 2260 2261 if (ether_addr_equal(payload, rfc1042_header)) 2262 skb->protocol = cpu_to_be16((payload[6] << 8) | 2263 payload[7]); 2264 } 2265 2266 /* 2267 * Initialize skb->priority for QoS frames. This is put in the TID field 2268 * of the frame before passing it to the driver. 2269 */ 2270 if (ieee80211_is_data_qos(hdr->frame_control)) { 2271 u8 *p = ieee80211_get_qos_ctl(hdr); 2272 skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK; 2273 } 2274 2275 memset(info, 0, sizeof(*info)); 2276 2277 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2278 IEEE80211_TX_CTL_INJECTED; 2279 2280 rcu_read_lock(); 2281 2282 /* 2283 * We process outgoing injected frames that have a local address 2284 * we handle as though they are non-injected frames. 2285 * This code here isn't entirely correct, the local MAC address 2286 * isn't always enough to find the interface to use; for proper 2287 * VLAN/WDS support we will need a different mechanism (which 2288 * likely isn't going to be monitor interfaces). 2289 * 2290 * This is necessary, for example, for old hostapd versions that 2291 * don't use nl80211-based management TX/RX. 2292 */ 2293 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2294 2295 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2296 if (!ieee80211_sdata_running(tmp_sdata)) 2297 continue; 2298 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2299 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2300 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2301 continue; 2302 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2303 sdata = tmp_sdata; 2304 break; 2305 } 2306 } 2307 2308 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2309 if (!chanctx_conf) { 2310 tmp_sdata = rcu_dereference(local->monitor_sdata); 2311 if (tmp_sdata) 2312 chanctx_conf = 2313 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2314 } 2315 2316 if (chanctx_conf) 2317 chandef = &chanctx_conf->def; 2318 else if (!local->use_chanctx) 2319 chandef = &local->_oper_chandef; 2320 else 2321 goto fail_rcu; 2322 2323 /* 2324 * Frame injection is not allowed if beaconing is not allowed 2325 * or if we need radar detection. Beaconing is usually not allowed when 2326 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2327 * Passive scan is also used in world regulatory domains where 2328 * your country is not known and as such it should be treated as 2329 * NO TX unless the channel is explicitly allowed in which case 2330 * your current regulatory domain would not have the passive scan 2331 * flag. 2332 * 2333 * Since AP mode uses monitor interfaces to inject/TX management 2334 * frames we can make AP mode the exception to this rule once it 2335 * supports radar detection as its implementation can deal with 2336 * radar detection by itself. We can do that later by adding a 2337 * monitor flag interfaces used for AP support. 2338 */ 2339 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2340 sdata->vif.type)) 2341 goto fail_rcu; 2342 2343 info->band = chandef->chan->band; 2344 2345 /* process and remove the injection radiotap header */ 2346 if (!ieee80211_parse_tx_radiotap(local, skb)) 2347 goto fail_rcu; 2348 2349 ieee80211_xmit(sdata, NULL, skb, 0); 2350 rcu_read_unlock(); 2351 2352 return NETDEV_TX_OK; 2353 2354 fail_rcu: 2355 rcu_read_unlock(); 2356 fail: 2357 dev_kfree_skb(skb); 2358 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2359 } 2360 2361 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2362 { 2363 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2364 2365 return ethertype == ETH_P_TDLS && 2366 skb->len > 14 && 2367 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2368 } 2369 2370 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2371 struct sk_buff *skb, 2372 struct sta_info **sta_out) 2373 { 2374 struct sta_info *sta; 2375 2376 switch (sdata->vif.type) { 2377 case NL80211_IFTYPE_AP_VLAN: 2378 sta = rcu_dereference(sdata->u.vlan.sta); 2379 if (sta) { 2380 *sta_out = sta; 2381 return 0; 2382 } else if (sdata->wdev.use_4addr) { 2383 return -ENOLINK; 2384 } 2385 /* fall through */ 2386 case NL80211_IFTYPE_AP: 2387 case NL80211_IFTYPE_OCB: 2388 case NL80211_IFTYPE_ADHOC: 2389 if (is_multicast_ether_addr(skb->data)) { 2390 *sta_out = ERR_PTR(-ENOENT); 2391 return 0; 2392 } 2393 sta = sta_info_get_bss(sdata, skb->data); 2394 break; 2395 case NL80211_IFTYPE_WDS: 2396 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2397 break; 2398 #ifdef CONFIG_MAC80211_MESH 2399 case NL80211_IFTYPE_MESH_POINT: 2400 /* determined much later */ 2401 *sta_out = NULL; 2402 return 0; 2403 #endif 2404 case NL80211_IFTYPE_STATION: 2405 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2406 sta = sta_info_get(sdata, skb->data); 2407 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2408 if (test_sta_flag(sta, 2409 WLAN_STA_TDLS_PEER_AUTH)) { 2410 *sta_out = sta; 2411 return 0; 2412 } 2413 2414 /* 2415 * TDLS link during setup - throw out frames to 2416 * peer. Allow TDLS-setup frames to unauthorized 2417 * peers for the special case of a link teardown 2418 * after a TDLS sta is removed due to being 2419 * unreachable. 2420 */ 2421 if (!ieee80211_is_tdls_setup(skb)) 2422 return -EINVAL; 2423 } 2424 2425 } 2426 2427 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2428 if (!sta) 2429 return -ENOLINK; 2430 break; 2431 default: 2432 return -EINVAL; 2433 } 2434 2435 *sta_out = sta ?: ERR_PTR(-ENOENT); 2436 return 0; 2437 } 2438 2439 static int ieee80211_store_ack_skb(struct ieee80211_local *local, 2440 struct sk_buff *skb, 2441 u32 *info_flags) 2442 { 2443 struct sk_buff *ack_skb = skb_clone_sk(skb); 2444 u16 info_id = 0; 2445 2446 if (ack_skb) { 2447 unsigned long flags; 2448 int id; 2449 2450 spin_lock_irqsave(&local->ack_status_lock, flags); 2451 id = idr_alloc(&local->ack_status_frames, ack_skb, 2452 1, 0x2000, GFP_ATOMIC); 2453 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2454 2455 if (id >= 0) { 2456 info_id = id; 2457 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2458 } else { 2459 kfree_skb(ack_skb); 2460 } 2461 } 2462 2463 return info_id; 2464 } 2465 2466 /** 2467 * ieee80211_build_hdr - build 802.11 header in the given frame 2468 * @sdata: virtual interface to build the header for 2469 * @skb: the skb to build the header in 2470 * @info_flags: skb flags to set 2471 * @ctrl_flags: info control flags to set 2472 * 2473 * This function takes the skb with 802.3 header and reformats the header to 2474 * the appropriate IEEE 802.11 header based on which interface the packet is 2475 * being transmitted on. 2476 * 2477 * Note that this function also takes care of the TX status request and 2478 * potential unsharing of the SKB - this needs to be interleaved with the 2479 * header building. 2480 * 2481 * The function requires the read-side RCU lock held 2482 * 2483 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2484 */ 2485 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2486 struct sk_buff *skb, u32 info_flags, 2487 struct sta_info *sta, u32 ctrl_flags) 2488 { 2489 struct ieee80211_local *local = sdata->local; 2490 struct ieee80211_tx_info *info; 2491 int head_need; 2492 u16 ethertype, hdrlen, meshhdrlen = 0; 2493 __le16 fc; 2494 struct ieee80211_hdr hdr; 2495 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2496 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2497 const u8 *encaps_data; 2498 int encaps_len, skip_header_bytes; 2499 bool wme_sta = false, authorized = false; 2500 bool tdls_peer; 2501 bool multicast; 2502 u16 info_id = 0; 2503 struct ieee80211_chanctx_conf *chanctx_conf; 2504 struct ieee80211_sub_if_data *ap_sdata; 2505 enum nl80211_band band; 2506 int ret; 2507 2508 if (IS_ERR(sta)) 2509 sta = NULL; 2510 2511 #ifdef CONFIG_MAC80211_DEBUGFS 2512 if (local->force_tx_status) 2513 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2514 #endif 2515 2516 /* convert Ethernet header to proper 802.11 header (based on 2517 * operation mode) */ 2518 ethertype = (skb->data[12] << 8) | skb->data[13]; 2519 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2520 2521 switch (sdata->vif.type) { 2522 case NL80211_IFTYPE_AP_VLAN: 2523 if (sdata->wdev.use_4addr) { 2524 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2525 /* RA TA DA SA */ 2526 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2527 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2528 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2529 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2530 hdrlen = 30; 2531 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2532 wme_sta = sta->sta.wme; 2533 } 2534 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2535 u.ap); 2536 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2537 if (!chanctx_conf) { 2538 ret = -ENOTCONN; 2539 goto free; 2540 } 2541 band = chanctx_conf->def.chan->band; 2542 if (sdata->wdev.use_4addr) 2543 break; 2544 /* fall through */ 2545 case NL80211_IFTYPE_AP: 2546 if (sdata->vif.type == NL80211_IFTYPE_AP) 2547 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2548 if (!chanctx_conf) { 2549 ret = -ENOTCONN; 2550 goto free; 2551 } 2552 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2553 /* DA BSSID SA */ 2554 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2555 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2556 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2557 hdrlen = 24; 2558 band = chanctx_conf->def.chan->band; 2559 break; 2560 case NL80211_IFTYPE_WDS: 2561 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2562 /* RA TA DA SA */ 2563 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2564 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2565 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2566 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2567 hdrlen = 30; 2568 /* 2569 * This is the exception! WDS style interfaces are prohibited 2570 * when channel contexts are in used so this must be valid 2571 */ 2572 band = local->hw.conf.chandef.chan->band; 2573 break; 2574 #ifdef CONFIG_MAC80211_MESH 2575 case NL80211_IFTYPE_MESH_POINT: 2576 if (!is_multicast_ether_addr(skb->data)) { 2577 struct sta_info *next_hop; 2578 bool mpp_lookup = true; 2579 2580 mpath = mesh_path_lookup(sdata, skb->data); 2581 if (mpath) { 2582 mpp_lookup = false; 2583 next_hop = rcu_dereference(mpath->next_hop); 2584 if (!next_hop || 2585 !(mpath->flags & (MESH_PATH_ACTIVE | 2586 MESH_PATH_RESOLVING))) 2587 mpp_lookup = true; 2588 } 2589 2590 if (mpp_lookup) { 2591 mppath = mpp_path_lookup(sdata, skb->data); 2592 if (mppath) 2593 mppath->exp_time = jiffies; 2594 } 2595 2596 if (mppath && mpath) 2597 mesh_path_del(sdata, mpath->dst); 2598 } 2599 2600 /* 2601 * Use address extension if it is a packet from 2602 * another interface or if we know the destination 2603 * is being proxied by a portal (i.e. portal address 2604 * differs from proxied address) 2605 */ 2606 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2607 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2608 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2609 skb->data, skb->data + ETH_ALEN); 2610 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2611 NULL, NULL); 2612 } else { 2613 /* DS -> MBSS (802.11-2012 13.11.3.3). 2614 * For unicast with unknown forwarding information, 2615 * destination might be in the MBSS or if that fails 2616 * forwarded to another mesh gate. In either case 2617 * resolution will be handled in ieee80211_xmit(), so 2618 * leave the original DA. This also works for mcast */ 2619 const u8 *mesh_da = skb->data; 2620 2621 if (mppath) 2622 mesh_da = mppath->mpp; 2623 else if (mpath) 2624 mesh_da = mpath->dst; 2625 2626 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2627 mesh_da, sdata->vif.addr); 2628 if (is_multicast_ether_addr(mesh_da)) 2629 /* DA TA mSA AE:SA */ 2630 meshhdrlen = ieee80211_new_mesh_header( 2631 sdata, &mesh_hdr, 2632 skb->data + ETH_ALEN, NULL); 2633 else 2634 /* RA TA mDA mSA AE:DA SA */ 2635 meshhdrlen = ieee80211_new_mesh_header( 2636 sdata, &mesh_hdr, skb->data, 2637 skb->data + ETH_ALEN); 2638 2639 } 2640 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2641 if (!chanctx_conf) { 2642 ret = -ENOTCONN; 2643 goto free; 2644 } 2645 band = chanctx_conf->def.chan->band; 2646 2647 /* For injected frames, fill RA right away as nexthop lookup 2648 * will be skipped. 2649 */ 2650 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2651 is_zero_ether_addr(hdr.addr1)) 2652 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2653 break; 2654 #endif 2655 case NL80211_IFTYPE_STATION: 2656 /* we already did checks when looking up the RA STA */ 2657 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2658 2659 if (tdls_peer) { 2660 /* DA SA BSSID */ 2661 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2662 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2663 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2664 hdrlen = 24; 2665 } else if (sdata->u.mgd.use_4addr && 2666 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2667 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2668 IEEE80211_FCTL_TODS); 2669 /* RA TA DA SA */ 2670 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2671 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2672 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2673 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2674 hdrlen = 30; 2675 } else { 2676 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2677 /* BSSID SA DA */ 2678 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2679 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2680 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2681 hdrlen = 24; 2682 } 2683 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2684 if (!chanctx_conf) { 2685 ret = -ENOTCONN; 2686 goto free; 2687 } 2688 band = chanctx_conf->def.chan->band; 2689 break; 2690 case NL80211_IFTYPE_OCB: 2691 /* DA SA BSSID */ 2692 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2693 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2694 eth_broadcast_addr(hdr.addr3); 2695 hdrlen = 24; 2696 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2697 if (!chanctx_conf) { 2698 ret = -ENOTCONN; 2699 goto free; 2700 } 2701 band = chanctx_conf->def.chan->band; 2702 break; 2703 case NL80211_IFTYPE_ADHOC: 2704 /* DA SA BSSID */ 2705 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2706 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2707 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2708 hdrlen = 24; 2709 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2710 if (!chanctx_conf) { 2711 ret = -ENOTCONN; 2712 goto free; 2713 } 2714 band = chanctx_conf->def.chan->band; 2715 break; 2716 default: 2717 ret = -EINVAL; 2718 goto free; 2719 } 2720 2721 multicast = is_multicast_ether_addr(hdr.addr1); 2722 2723 /* sta is always NULL for mesh */ 2724 if (sta) { 2725 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2726 wme_sta = sta->sta.wme; 2727 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2728 /* For mesh, the use of the QoS header is mandatory */ 2729 wme_sta = true; 2730 } 2731 2732 /* receiver does QoS (which also means we do) use it */ 2733 if (wme_sta) { 2734 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2735 hdrlen += 2; 2736 } 2737 2738 /* 2739 * Drop unicast frames to unauthorised stations unless they are 2740 * EAPOL frames from the local station. 2741 */ 2742 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2743 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2744 !multicast && !authorized && 2745 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2746 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2747 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2748 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2749 sdata->name, hdr.addr1); 2750 #endif 2751 2752 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2753 2754 ret = -EPERM; 2755 goto free; 2756 } 2757 2758 if (unlikely(!multicast && skb->sk && 2759 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 2760 info_id = ieee80211_store_ack_skb(local, skb, &info_flags); 2761 2762 /* 2763 * If the skb is shared we need to obtain our own copy. 2764 */ 2765 if (skb_shared(skb)) { 2766 struct sk_buff *tmp_skb = skb; 2767 2768 /* can't happen -- skb is a clone if info_id != 0 */ 2769 WARN_ON(info_id); 2770 2771 skb = skb_clone(skb, GFP_ATOMIC); 2772 kfree_skb(tmp_skb); 2773 2774 if (!skb) { 2775 ret = -ENOMEM; 2776 goto free; 2777 } 2778 } 2779 2780 hdr.frame_control = fc; 2781 hdr.duration_id = 0; 2782 hdr.seq_ctrl = 0; 2783 2784 skip_header_bytes = ETH_HLEN; 2785 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2786 encaps_data = bridge_tunnel_header; 2787 encaps_len = sizeof(bridge_tunnel_header); 2788 skip_header_bytes -= 2; 2789 } else if (ethertype >= ETH_P_802_3_MIN) { 2790 encaps_data = rfc1042_header; 2791 encaps_len = sizeof(rfc1042_header); 2792 skip_header_bytes -= 2; 2793 } else { 2794 encaps_data = NULL; 2795 encaps_len = 0; 2796 } 2797 2798 skb_pull(skb, skip_header_bytes); 2799 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2800 2801 /* 2802 * So we need to modify the skb header and hence need a copy of 2803 * that. The head_need variable above doesn't, so far, include 2804 * the needed header space that we don't need right away. If we 2805 * can, then we don't reallocate right now but only after the 2806 * frame arrives at the master device (if it does...) 2807 * 2808 * If we cannot, however, then we will reallocate to include all 2809 * the ever needed space. Also, if we need to reallocate it anyway, 2810 * make it big enough for everything we may ever need. 2811 */ 2812 2813 if (head_need > 0 || skb_cloned(skb)) { 2814 head_need += sdata->encrypt_headroom; 2815 head_need += local->tx_headroom; 2816 head_need = max_t(int, 0, head_need); 2817 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2818 ieee80211_free_txskb(&local->hw, skb); 2819 skb = NULL; 2820 return ERR_PTR(-ENOMEM); 2821 } 2822 } 2823 2824 if (encaps_data) 2825 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2826 2827 #ifdef CONFIG_MAC80211_MESH 2828 if (meshhdrlen > 0) 2829 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2830 #endif 2831 2832 if (ieee80211_is_data_qos(fc)) { 2833 __le16 *qos_control; 2834 2835 qos_control = skb_push(skb, 2); 2836 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2837 /* 2838 * Maybe we could actually set some fields here, for now just 2839 * initialise to zero to indicate no special operation. 2840 */ 2841 *qos_control = 0; 2842 } else 2843 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2844 2845 skb_reset_mac_header(skb); 2846 2847 info = IEEE80211_SKB_CB(skb); 2848 memset(info, 0, sizeof(*info)); 2849 2850 info->flags = info_flags; 2851 info->ack_frame_id = info_id; 2852 info->band = band; 2853 info->control.flags = ctrl_flags; 2854 2855 return skb; 2856 free: 2857 kfree_skb(skb); 2858 return ERR_PTR(ret); 2859 } 2860 2861 /* 2862 * fast-xmit overview 2863 * 2864 * The core idea of this fast-xmit is to remove per-packet checks by checking 2865 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2866 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2867 * much less work can be done per packet. For example, fragmentation must be 2868 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2869 * in the code here. 2870 * 2871 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2872 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2873 * 2874 * The most difficult part of this is that when any of these assumptions 2875 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2876 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2877 * since the per-packet code no longer checks the conditions. This is reflected 2878 * by the calls to these functions throughout the rest of the code, and must be 2879 * maintained if any of the TX path checks change. 2880 */ 2881 2882 void ieee80211_check_fast_xmit(struct sta_info *sta) 2883 { 2884 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2885 struct ieee80211_local *local = sta->local; 2886 struct ieee80211_sub_if_data *sdata = sta->sdata; 2887 struct ieee80211_hdr *hdr = (void *)build.hdr; 2888 struct ieee80211_chanctx_conf *chanctx_conf; 2889 __le16 fc; 2890 2891 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2892 return; 2893 2894 /* Locking here protects both the pointer itself, and against concurrent 2895 * invocations winning data access races to, e.g., the key pointer that 2896 * is used. 2897 * Without it, the invocation of this function right after the key 2898 * pointer changes wouldn't be sufficient, as another CPU could access 2899 * the pointer, then stall, and then do the cache update after the CPU 2900 * that invalidated the key. 2901 * With the locking, such scenarios cannot happen as the check for the 2902 * key and the fast-tx assignment are done atomically, so the CPU that 2903 * modifies the key will either wait or other one will see the key 2904 * cleared/changed already. 2905 */ 2906 spin_lock_bh(&sta->lock); 2907 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2908 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2909 sdata->vif.type == NL80211_IFTYPE_STATION) 2910 goto out; 2911 2912 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2913 goto out; 2914 2915 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2916 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2917 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2918 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2919 goto out; 2920 2921 if (sdata->noack_map) 2922 goto out; 2923 2924 /* fast-xmit doesn't handle fragmentation at all */ 2925 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2926 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2927 goto out; 2928 2929 rcu_read_lock(); 2930 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2931 if (!chanctx_conf) { 2932 rcu_read_unlock(); 2933 goto out; 2934 } 2935 build.band = chanctx_conf->def.chan->band; 2936 rcu_read_unlock(); 2937 2938 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2939 2940 switch (sdata->vif.type) { 2941 case NL80211_IFTYPE_ADHOC: 2942 /* DA SA BSSID */ 2943 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2944 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2945 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2946 build.hdr_len = 24; 2947 break; 2948 case NL80211_IFTYPE_STATION: 2949 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 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.mgd.bssid, ETH_ALEN); 2954 build.hdr_len = 24; 2955 break; 2956 } 2957 2958 if (sdata->u.mgd.use_4addr) { 2959 /* non-regular ethertype cannot use the fastpath */ 2960 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2961 IEEE80211_FCTL_TODS); 2962 /* RA TA DA SA */ 2963 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2964 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2965 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2966 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2967 build.hdr_len = 30; 2968 break; 2969 } 2970 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2971 /* BSSID SA DA */ 2972 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2973 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2974 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2975 build.hdr_len = 24; 2976 break; 2977 case NL80211_IFTYPE_AP_VLAN: 2978 if (sdata->wdev.use_4addr) { 2979 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2980 IEEE80211_FCTL_TODS); 2981 /* RA TA DA SA */ 2982 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2983 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2984 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2985 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2986 build.hdr_len = 30; 2987 break; 2988 } 2989 /* fall through */ 2990 case NL80211_IFTYPE_AP: 2991 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2992 /* DA BSSID SA */ 2993 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2994 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2995 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2996 build.hdr_len = 24; 2997 break; 2998 default: 2999 /* not handled on fast-xmit */ 3000 goto out; 3001 } 3002 3003 if (sta->sta.wme) { 3004 build.hdr_len += 2; 3005 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3006 } 3007 3008 /* We store the key here so there's no point in using rcu_dereference() 3009 * but that's fine because the code that changes the pointers will call 3010 * this function after doing so. For a single CPU that would be enough, 3011 * for multiple see the comment above. 3012 */ 3013 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3014 if (!build.key) 3015 build.key = rcu_access_pointer(sdata->default_unicast_key); 3016 if (build.key) { 3017 bool gen_iv, iv_spc, mmic; 3018 3019 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3020 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3021 mmic = build.key->conf.flags & 3022 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3023 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3024 3025 /* don't handle software crypto */ 3026 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3027 goto out; 3028 3029 /* Key is being removed */ 3030 if (build.key->flags & KEY_FLAG_TAINTED) 3031 goto out; 3032 3033 switch (build.key->conf.cipher) { 3034 case WLAN_CIPHER_SUITE_CCMP: 3035 case WLAN_CIPHER_SUITE_CCMP_256: 3036 if (gen_iv) 3037 build.pn_offs = build.hdr_len; 3038 if (gen_iv || iv_spc) 3039 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3040 break; 3041 case WLAN_CIPHER_SUITE_GCMP: 3042 case WLAN_CIPHER_SUITE_GCMP_256: 3043 if (gen_iv) 3044 build.pn_offs = build.hdr_len; 3045 if (gen_iv || iv_spc) 3046 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3047 break; 3048 case WLAN_CIPHER_SUITE_TKIP: 3049 /* cannot handle MMIC or IV generation in xmit-fast */ 3050 if (mmic || gen_iv) 3051 goto out; 3052 if (iv_spc) 3053 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3054 break; 3055 case WLAN_CIPHER_SUITE_WEP40: 3056 case WLAN_CIPHER_SUITE_WEP104: 3057 /* cannot handle IV generation in fast-xmit */ 3058 if (gen_iv) 3059 goto out; 3060 if (iv_spc) 3061 build.hdr_len += IEEE80211_WEP_IV_LEN; 3062 break; 3063 case WLAN_CIPHER_SUITE_AES_CMAC: 3064 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3065 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3066 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3067 WARN(1, 3068 "management cipher suite 0x%x enabled for data\n", 3069 build.key->conf.cipher); 3070 goto out; 3071 default: 3072 /* we don't know how to generate IVs for this at all */ 3073 if (WARN_ON(gen_iv)) 3074 goto out; 3075 /* pure hardware keys are OK, of course */ 3076 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3077 break; 3078 /* cipher scheme might require space allocation */ 3079 if (iv_spc && 3080 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3081 goto out; 3082 if (iv_spc) 3083 build.hdr_len += build.key->conf.iv_len; 3084 } 3085 3086 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3087 } 3088 3089 hdr->frame_control = fc; 3090 3091 memcpy(build.hdr + build.hdr_len, 3092 rfc1042_header, sizeof(rfc1042_header)); 3093 build.hdr_len += sizeof(rfc1042_header); 3094 3095 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3096 /* if the kmemdup fails, continue w/o fast_tx */ 3097 if (!fast_tx) 3098 goto out; 3099 3100 out: 3101 /* we might have raced against another call to this function */ 3102 old = rcu_dereference_protected(sta->fast_tx, 3103 lockdep_is_held(&sta->lock)); 3104 rcu_assign_pointer(sta->fast_tx, fast_tx); 3105 if (old) 3106 kfree_rcu(old, rcu_head); 3107 spin_unlock_bh(&sta->lock); 3108 } 3109 3110 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3111 { 3112 struct sta_info *sta; 3113 3114 rcu_read_lock(); 3115 list_for_each_entry_rcu(sta, &local->sta_list, list) 3116 ieee80211_check_fast_xmit(sta); 3117 rcu_read_unlock(); 3118 } 3119 3120 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3121 { 3122 struct ieee80211_local *local = sdata->local; 3123 struct sta_info *sta; 3124 3125 rcu_read_lock(); 3126 3127 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3128 if (sdata != sta->sdata && 3129 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3130 continue; 3131 ieee80211_check_fast_xmit(sta); 3132 } 3133 3134 rcu_read_unlock(); 3135 } 3136 3137 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3138 { 3139 struct ieee80211_fast_tx *fast_tx; 3140 3141 spin_lock_bh(&sta->lock); 3142 fast_tx = rcu_dereference_protected(sta->fast_tx, 3143 lockdep_is_held(&sta->lock)); 3144 RCU_INIT_POINTER(sta->fast_tx, NULL); 3145 spin_unlock_bh(&sta->lock); 3146 3147 if (fast_tx) 3148 kfree_rcu(fast_tx, rcu_head); 3149 } 3150 3151 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3152 struct sk_buff *skb, int headroom) 3153 { 3154 if (skb_headroom(skb) < headroom) { 3155 I802_DEBUG_INC(local->tx_expand_skb_head); 3156 3157 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3158 wiphy_debug(local->hw.wiphy, 3159 "failed to reallocate TX buffer\n"); 3160 return false; 3161 } 3162 } 3163 3164 return true; 3165 } 3166 3167 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3168 struct ieee80211_fast_tx *fast_tx, 3169 struct sk_buff *skb) 3170 { 3171 struct ieee80211_local *local = sdata->local; 3172 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3173 struct ieee80211_hdr *hdr; 3174 struct ethhdr *amsdu_hdr; 3175 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3176 int subframe_len = skb->len - hdr_len; 3177 void *data; 3178 u8 *qc, *h_80211_src, *h_80211_dst; 3179 const u8 *bssid; 3180 3181 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3182 return false; 3183 3184 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3185 return true; 3186 3187 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3188 return false; 3189 3190 data = skb_push(skb, sizeof(*amsdu_hdr)); 3191 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3192 hdr = data; 3193 amsdu_hdr = data + hdr_len; 3194 /* h_80211_src/dst is addr* field within hdr */ 3195 h_80211_src = data + fast_tx->sa_offs; 3196 h_80211_dst = data + fast_tx->da_offs; 3197 3198 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3199 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3200 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3201 3202 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3203 * fields needs to be changed to BSSID for A-MSDU frames depending 3204 * on FromDS/ToDS values. 3205 */ 3206 switch (sdata->vif.type) { 3207 case NL80211_IFTYPE_STATION: 3208 bssid = sdata->u.mgd.bssid; 3209 break; 3210 case NL80211_IFTYPE_AP: 3211 case NL80211_IFTYPE_AP_VLAN: 3212 bssid = sdata->vif.addr; 3213 break; 3214 default: 3215 bssid = NULL; 3216 } 3217 3218 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3219 ether_addr_copy(h_80211_src, bssid); 3220 3221 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3222 ether_addr_copy(h_80211_dst, bssid); 3223 3224 qc = ieee80211_get_qos_ctl(hdr); 3225 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3226 3227 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3228 3229 return true; 3230 } 3231 3232 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3233 struct sta_info *sta, 3234 struct ieee80211_fast_tx *fast_tx, 3235 struct sk_buff *skb) 3236 { 3237 struct ieee80211_local *local = sdata->local; 3238 struct fq *fq = &local->fq; 3239 struct fq_tin *tin; 3240 struct fq_flow *flow; 3241 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3242 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3243 struct txq_info *txqi; 3244 struct sk_buff **frag_tail, *head; 3245 int subframe_len = skb->len - ETH_ALEN; 3246 u8 max_subframes = sta->sta.max_amsdu_subframes; 3247 int max_frags = local->hw.max_tx_fragments; 3248 int max_amsdu_len = sta->sta.max_amsdu_len; 3249 int orig_truesize; 3250 u32 flow_idx; 3251 __be16 len; 3252 void *data; 3253 bool ret = false; 3254 unsigned int orig_len; 3255 int n = 2, nfrags, pad = 0; 3256 u16 hdrlen; 3257 3258 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3259 return false; 3260 3261 if (skb_is_gso(skb)) 3262 return false; 3263 3264 if (!txq) 3265 return false; 3266 3267 txqi = to_txq_info(txq); 3268 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3269 return false; 3270 3271 if (sta->sta.max_rc_amsdu_len) 3272 max_amsdu_len = min_t(int, max_amsdu_len, 3273 sta->sta.max_rc_amsdu_len); 3274 3275 if (sta->sta.max_tid_amsdu_len[tid]) 3276 max_amsdu_len = min_t(int, max_amsdu_len, 3277 sta->sta.max_tid_amsdu_len[tid]); 3278 3279 flow_idx = fq_flow_idx(fq, skb); 3280 3281 spin_lock_bh(&fq->lock); 3282 3283 /* TODO: Ideally aggregation should be done on dequeue to remain 3284 * responsive to environment changes. 3285 */ 3286 3287 tin = &txqi->tin; 3288 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3289 fq_flow_get_default_func); 3290 head = skb_peek_tail(&flow->queue); 3291 if (!head || skb_is_gso(head)) 3292 goto out; 3293 3294 orig_truesize = head->truesize; 3295 orig_len = head->len; 3296 3297 if (skb->len + head->len > max_amsdu_len) 3298 goto out; 3299 3300 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3301 nfrags += 1 + skb_shinfo(head)->nr_frags; 3302 frag_tail = &skb_shinfo(head)->frag_list; 3303 while (*frag_tail) { 3304 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3305 frag_tail = &(*frag_tail)->next; 3306 n++; 3307 } 3308 3309 if (max_subframes && n > max_subframes) 3310 goto out; 3311 3312 if (max_frags && nfrags > max_frags) 3313 goto out; 3314 3315 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3316 goto out; 3317 3318 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3319 goto out; 3320 3321 /* 3322 * Pad out the previous subframe to a multiple of 4 by adding the 3323 * padding to the next one, that's being added. Note that head->len 3324 * is the length of the full A-MSDU, but that works since each time 3325 * we add a new subframe we pad out the previous one to a multiple 3326 * of 4 and thus it no longer matters in the next round. 3327 */ 3328 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3329 if ((head->len - hdrlen) & 3) 3330 pad = 4 - ((head->len - hdrlen) & 3); 3331 3332 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3333 2 + pad)) 3334 goto out_recalc; 3335 3336 ret = true; 3337 data = skb_push(skb, ETH_ALEN + 2); 3338 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3339 3340 data += 2 * ETH_ALEN; 3341 len = cpu_to_be16(subframe_len); 3342 memcpy(data, &len, 2); 3343 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3344 3345 memset(skb_push(skb, pad), 0, pad); 3346 3347 head->len += skb->len; 3348 head->data_len += skb->len; 3349 *frag_tail = skb; 3350 3351 out_recalc: 3352 fq->memory_usage += head->truesize - orig_truesize; 3353 if (head->len != orig_len) { 3354 flow->backlog += head->len - orig_len; 3355 tin->backlog_bytes += head->len - orig_len; 3356 3357 fq_recalc_backlog(fq, tin, flow); 3358 } 3359 out: 3360 spin_unlock_bh(&fq->lock); 3361 3362 return ret; 3363 } 3364 3365 /* 3366 * Can be called while the sta lock is held. Anything that can cause packets to 3367 * be generated will cause deadlock! 3368 */ 3369 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3370 struct sta_info *sta, u8 pn_offs, 3371 struct ieee80211_key *key, 3372 struct sk_buff *skb) 3373 { 3374 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3375 struct ieee80211_hdr *hdr = (void *)skb->data; 3376 u8 tid = IEEE80211_NUM_TIDS; 3377 3378 if (key) 3379 info->control.hw_key = &key->conf; 3380 3381 ieee80211_tx_stats(skb->dev, skb->len); 3382 3383 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3384 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3385 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3386 } else { 3387 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3388 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3389 sdata->sequence_number += 0x10; 3390 } 3391 3392 if (skb_shinfo(skb)->gso_size) 3393 sta->tx_stats.msdu[tid] += 3394 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3395 else 3396 sta->tx_stats.msdu[tid]++; 3397 3398 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3399 3400 /* statistics normally done by ieee80211_tx_h_stats (but that 3401 * has to consider fragmentation, so is more complex) 3402 */ 3403 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3404 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3405 3406 if (pn_offs) { 3407 u64 pn; 3408 u8 *crypto_hdr = skb->data + pn_offs; 3409 3410 switch (key->conf.cipher) { 3411 case WLAN_CIPHER_SUITE_CCMP: 3412 case WLAN_CIPHER_SUITE_CCMP_256: 3413 case WLAN_CIPHER_SUITE_GCMP: 3414 case WLAN_CIPHER_SUITE_GCMP_256: 3415 pn = atomic64_inc_return(&key->conf.tx_pn); 3416 crypto_hdr[0] = pn; 3417 crypto_hdr[1] = pn >> 8; 3418 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3419 crypto_hdr[4] = pn >> 16; 3420 crypto_hdr[5] = pn >> 24; 3421 crypto_hdr[6] = pn >> 32; 3422 crypto_hdr[7] = pn >> 40; 3423 break; 3424 } 3425 } 3426 } 3427 3428 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3429 struct sta_info *sta, 3430 struct ieee80211_fast_tx *fast_tx, 3431 struct sk_buff *skb) 3432 { 3433 struct ieee80211_local *local = sdata->local; 3434 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3435 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3436 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3437 struct ethhdr eth; 3438 struct ieee80211_tx_info *info; 3439 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3440 struct ieee80211_tx_data tx; 3441 ieee80211_tx_result r; 3442 struct tid_ampdu_tx *tid_tx = NULL; 3443 u8 tid = IEEE80211_NUM_TIDS; 3444 3445 /* control port protocol needs a lot of special handling */ 3446 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3447 return false; 3448 3449 /* only RFC 1042 SNAP */ 3450 if (ethertype < ETH_P_802_3_MIN) 3451 return false; 3452 3453 /* don't handle TX status request here either */ 3454 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3455 return false; 3456 3457 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3458 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3459 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3460 if (tid_tx) { 3461 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3462 return false; 3463 if (tid_tx->timeout) 3464 tid_tx->last_tx = jiffies; 3465 } 3466 } 3467 3468 /* after this point (skb is modified) we cannot return false */ 3469 3470 if (skb_shared(skb)) { 3471 struct sk_buff *tmp_skb = skb; 3472 3473 skb = skb_clone(skb, GFP_ATOMIC); 3474 kfree_skb(tmp_skb); 3475 3476 if (!skb) 3477 return true; 3478 } 3479 3480 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3481 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3482 return true; 3483 3484 /* will not be crypto-handled beyond what we do here, so use false 3485 * as the may-encrypt argument for the resize to not account for 3486 * more room than we already have in 'extra_head' 3487 */ 3488 if (unlikely(ieee80211_skb_resize(sdata, skb, 3489 max_t(int, extra_head + hw_headroom - 3490 skb_headroom(skb), 0), 3491 false))) { 3492 kfree_skb(skb); 3493 return true; 3494 } 3495 3496 memcpy(ð, skb->data, ETH_HLEN - 2); 3497 hdr = skb_push(skb, extra_head); 3498 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3499 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3500 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3501 3502 info = IEEE80211_SKB_CB(skb); 3503 memset(info, 0, sizeof(*info)); 3504 info->band = fast_tx->band; 3505 info->control.vif = &sdata->vif; 3506 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3507 IEEE80211_TX_CTL_DONTFRAG | 3508 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3509 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3510 3511 #ifdef CONFIG_MAC80211_DEBUGFS 3512 if (local->force_tx_status) 3513 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3514 #endif 3515 3516 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3517 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3518 *ieee80211_get_qos_ctl(hdr) = tid; 3519 } 3520 3521 __skb_queue_head_init(&tx.skbs); 3522 3523 tx.flags = IEEE80211_TX_UNICAST; 3524 tx.local = local; 3525 tx.sdata = sdata; 3526 tx.sta = sta; 3527 tx.key = fast_tx->key; 3528 3529 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3530 tx.skb = skb; 3531 r = ieee80211_tx_h_rate_ctrl(&tx); 3532 skb = tx.skb; 3533 tx.skb = NULL; 3534 3535 if (r != TX_CONTINUE) { 3536 if (r != TX_QUEUED) 3537 kfree_skb(skb); 3538 return true; 3539 } 3540 } 3541 3542 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3543 return true; 3544 3545 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3546 fast_tx->key, skb); 3547 3548 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3549 sdata = container_of(sdata->bss, 3550 struct ieee80211_sub_if_data, u.ap); 3551 3552 __skb_queue_tail(&tx.skbs, skb); 3553 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3554 return true; 3555 } 3556 3557 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3558 struct ieee80211_txq *txq) 3559 { 3560 struct ieee80211_local *local = hw_to_local(hw); 3561 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3562 struct ieee80211_hdr *hdr; 3563 struct sk_buff *skb = NULL; 3564 struct fq *fq = &local->fq; 3565 struct fq_tin *tin = &txqi->tin; 3566 struct ieee80211_tx_info *info; 3567 struct ieee80211_tx_data tx; 3568 ieee80211_tx_result r; 3569 struct ieee80211_vif *vif = txq->vif; 3570 3571 WARN_ON_ONCE(softirq_count() == 0); 3572 3573 if (!ieee80211_txq_airtime_check(hw, txq)) 3574 return NULL; 3575 3576 begin: 3577 spin_lock_bh(&fq->lock); 3578 3579 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3580 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3581 goto out; 3582 3583 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3584 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3585 goto out; 3586 } 3587 3588 /* Make sure fragments stay together. */ 3589 skb = __skb_dequeue(&txqi->frags); 3590 if (skb) 3591 goto out; 3592 3593 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3594 if (!skb) 3595 goto out; 3596 3597 spin_unlock_bh(&fq->lock); 3598 3599 hdr = (struct ieee80211_hdr *)skb->data; 3600 info = IEEE80211_SKB_CB(skb); 3601 3602 memset(&tx, 0, sizeof(tx)); 3603 __skb_queue_head_init(&tx.skbs); 3604 tx.local = local; 3605 tx.skb = skb; 3606 tx.sdata = vif_to_sdata(info->control.vif); 3607 3608 if (txq->sta) { 3609 tx.sta = container_of(txq->sta, struct sta_info, sta); 3610 /* 3611 * Drop unicast frames to unauthorised stations unless they are 3612 * EAPOL frames from the local station. 3613 */ 3614 if (unlikely(ieee80211_is_data(hdr->frame_control) && 3615 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3616 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3617 !is_multicast_ether_addr(hdr->addr1) && 3618 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3619 (!(info->control.flags & 3620 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3621 !ether_addr_equal(tx.sdata->vif.addr, 3622 hdr->addr2)))) { 3623 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3624 ieee80211_free_txskb(&local->hw, skb); 3625 goto begin; 3626 } 3627 } 3628 3629 /* 3630 * The key can be removed while the packet was queued, so need to call 3631 * this here to get the current key. 3632 */ 3633 r = ieee80211_tx_h_select_key(&tx); 3634 if (r != TX_CONTINUE) { 3635 ieee80211_free_txskb(&local->hw, skb); 3636 goto begin; 3637 } 3638 3639 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3640 info->flags |= IEEE80211_TX_CTL_AMPDU; 3641 else 3642 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3643 3644 if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) 3645 goto encap_out; 3646 3647 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3648 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3649 sta); 3650 u8 pn_offs = 0; 3651 3652 if (tx.key && 3653 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3654 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3655 3656 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3657 tx.key, skb); 3658 } else { 3659 if (invoke_tx_handlers_late(&tx)) 3660 goto begin; 3661 3662 skb = __skb_dequeue(&tx.skbs); 3663 3664 if (!skb_queue_empty(&tx.skbs)) { 3665 spin_lock_bh(&fq->lock); 3666 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3667 spin_unlock_bh(&fq->lock); 3668 } 3669 } 3670 3671 if (skb_has_frag_list(skb) && 3672 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3673 if (skb_linearize(skb)) { 3674 ieee80211_free_txskb(&local->hw, skb); 3675 goto begin; 3676 } 3677 } 3678 3679 switch (tx.sdata->vif.type) { 3680 case NL80211_IFTYPE_MONITOR: 3681 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3682 vif = &tx.sdata->vif; 3683 break; 3684 } 3685 tx.sdata = rcu_dereference(local->monitor_sdata); 3686 if (tx.sdata) { 3687 vif = &tx.sdata->vif; 3688 info->hw_queue = 3689 vif->hw_queue[skb_get_queue_mapping(skb)]; 3690 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3691 ieee80211_free_txskb(&local->hw, skb); 3692 goto begin; 3693 } else { 3694 vif = NULL; 3695 } 3696 break; 3697 case NL80211_IFTYPE_AP_VLAN: 3698 tx.sdata = container_of(tx.sdata->bss, 3699 struct ieee80211_sub_if_data, u.ap); 3700 /* fall through */ 3701 default: 3702 vif = &tx.sdata->vif; 3703 break; 3704 } 3705 3706 encap_out: 3707 IEEE80211_SKB_CB(skb)->control.vif = vif; 3708 3709 if (vif && 3710 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3711 u32 airtime; 3712 3713 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3714 skb->len); 3715 if (airtime) { 3716 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3717 ieee80211_sta_update_pending_airtime(local, tx.sta, 3718 txq->ac, 3719 airtime, 3720 false); 3721 } 3722 } 3723 3724 return skb; 3725 3726 out: 3727 spin_unlock_bh(&fq->lock); 3728 3729 return skb; 3730 } 3731 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3732 3733 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3734 { 3735 struct ieee80211_local *local = hw_to_local(hw); 3736 struct ieee80211_txq *ret = NULL; 3737 struct txq_info *txqi = NULL, *head = NULL; 3738 bool found_eligible_txq = false; 3739 3740 spin_lock_bh(&local->active_txq_lock[ac]); 3741 3742 begin: 3743 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3744 struct txq_info, 3745 schedule_order); 3746 if (!txqi) 3747 goto out; 3748 3749 if (txqi == head) { 3750 if (!found_eligible_txq) 3751 goto out; 3752 else 3753 found_eligible_txq = false; 3754 } 3755 3756 if (!head) 3757 head = txqi; 3758 3759 if (txqi->txq.sta) { 3760 struct sta_info *sta = container_of(txqi->txq.sta, 3761 struct sta_info, sta); 3762 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3763 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3764 3765 if (aql_check) 3766 found_eligible_txq = true; 3767 3768 if (deficit < 0) 3769 sta->airtime[txqi->txq.ac].deficit += 3770 sta->airtime_weight; 3771 3772 if (deficit < 0 || !aql_check) { 3773 list_move_tail(&txqi->schedule_order, 3774 &local->active_txqs[txqi->txq.ac]); 3775 goto begin; 3776 } 3777 } 3778 3779 3780 if (txqi->schedule_round == local->schedule_round[ac]) 3781 goto out; 3782 3783 list_del_init(&txqi->schedule_order); 3784 txqi->schedule_round = local->schedule_round[ac]; 3785 ret = &txqi->txq; 3786 3787 out: 3788 spin_unlock_bh(&local->active_txq_lock[ac]); 3789 return ret; 3790 } 3791 EXPORT_SYMBOL(ieee80211_next_txq); 3792 3793 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3794 struct ieee80211_txq *txq, 3795 bool force) 3796 { 3797 struct ieee80211_local *local = hw_to_local(hw); 3798 struct txq_info *txqi = to_txq_info(txq); 3799 3800 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3801 3802 if (list_empty(&txqi->schedule_order) && 3803 (force || !skb_queue_empty(&txqi->frags) || 3804 txqi->tin.backlog_packets)) { 3805 /* If airtime accounting is active, always enqueue STAs at the 3806 * head of the list to ensure that they only get moved to the 3807 * back by the airtime DRR scheduler once they have a negative 3808 * deficit. A station that already has a negative deficit will 3809 * get immediately moved to the back of the list on the next 3810 * call to ieee80211_next_txq(). 3811 */ 3812 if (txqi->txq.sta && 3813 wiphy_ext_feature_isset(local->hw.wiphy, 3814 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3815 list_add(&txqi->schedule_order, 3816 &local->active_txqs[txq->ac]); 3817 else 3818 list_add_tail(&txqi->schedule_order, 3819 &local->active_txqs[txq->ac]); 3820 } 3821 3822 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3823 } 3824 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3825 3826 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3827 struct ieee80211_txq *txq) 3828 { 3829 struct sta_info *sta; 3830 struct ieee80211_local *local = hw_to_local(hw); 3831 3832 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3833 return true; 3834 3835 if (!txq->sta) 3836 return true; 3837 3838 sta = container_of(txq->sta, struct sta_info, sta); 3839 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3840 sta->airtime[txq->ac].aql_limit_low) 3841 return true; 3842 3843 if (atomic_read(&local->aql_total_pending_airtime) < 3844 local->aql_threshold && 3845 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3846 sta->airtime[txq->ac].aql_limit_high) 3847 return true; 3848 3849 return false; 3850 } 3851 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3852 3853 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3854 struct ieee80211_txq *txq) 3855 { 3856 struct ieee80211_local *local = hw_to_local(hw); 3857 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3858 struct sta_info *sta; 3859 u8 ac = txq->ac; 3860 3861 spin_lock_bh(&local->active_txq_lock[ac]); 3862 3863 if (!txqi->txq.sta) 3864 goto out; 3865 3866 if (list_empty(&txqi->schedule_order)) 3867 goto out; 3868 3869 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3870 schedule_order) { 3871 if (iter == txqi) 3872 break; 3873 3874 if (!iter->txq.sta) { 3875 list_move_tail(&iter->schedule_order, 3876 &local->active_txqs[ac]); 3877 continue; 3878 } 3879 sta = container_of(iter->txq.sta, struct sta_info, sta); 3880 if (sta->airtime[ac].deficit < 0) 3881 sta->airtime[ac].deficit += sta->airtime_weight; 3882 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3883 } 3884 3885 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3886 if (sta->airtime[ac].deficit >= 0) 3887 goto out; 3888 3889 sta->airtime[ac].deficit += sta->airtime_weight; 3890 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3891 spin_unlock_bh(&local->active_txq_lock[ac]); 3892 3893 return false; 3894 out: 3895 if (!list_empty(&txqi->schedule_order)) 3896 list_del_init(&txqi->schedule_order); 3897 spin_unlock_bh(&local->active_txq_lock[ac]); 3898 3899 return true; 3900 } 3901 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3902 3903 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3904 { 3905 struct ieee80211_local *local = hw_to_local(hw); 3906 3907 spin_lock_bh(&local->active_txq_lock[ac]); 3908 local->schedule_round[ac]++; 3909 spin_unlock_bh(&local->active_txq_lock[ac]); 3910 } 3911 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3912 3913 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3914 struct net_device *dev, 3915 u32 info_flags, 3916 u32 ctrl_flags) 3917 { 3918 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3919 struct ieee80211_local *local = sdata->local; 3920 struct sta_info *sta; 3921 struct sk_buff *next; 3922 3923 if (unlikely(skb->len < ETH_HLEN)) { 3924 kfree_skb(skb); 3925 return; 3926 } 3927 3928 rcu_read_lock(); 3929 3930 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3931 goto out_free; 3932 3933 if (IS_ERR(sta)) 3934 sta = NULL; 3935 3936 if (local->ops->wake_tx_queue) { 3937 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3938 skb_set_queue_mapping(skb, queue); 3939 } 3940 3941 if (sta) { 3942 struct ieee80211_fast_tx *fast_tx; 3943 3944 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3945 3946 fast_tx = rcu_dereference(sta->fast_tx); 3947 3948 if (fast_tx && 3949 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3950 goto out; 3951 } 3952 3953 if (skb_is_gso(skb)) { 3954 struct sk_buff *segs; 3955 3956 segs = skb_gso_segment(skb, 0); 3957 if (IS_ERR(segs)) { 3958 goto out_free; 3959 } else if (segs) { 3960 consume_skb(skb); 3961 skb = segs; 3962 } 3963 } else { 3964 /* we cannot process non-linear frames on this path */ 3965 if (skb_linearize(skb)) { 3966 kfree_skb(skb); 3967 goto out; 3968 } 3969 3970 /* the frame could be fragmented, software-encrypted, and other 3971 * things so we cannot really handle checksum offload with it - 3972 * fix it up in software before we handle anything else. 3973 */ 3974 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3975 skb_set_transport_header(skb, 3976 skb_checksum_start_offset(skb)); 3977 if (skb_checksum_help(skb)) 3978 goto out_free; 3979 } 3980 } 3981 3982 skb_list_walk_safe(skb, skb, next) { 3983 skb_mark_not_on_list(skb); 3984 3985 skb = ieee80211_build_hdr(sdata, skb, info_flags, 3986 sta, ctrl_flags); 3987 if (IS_ERR(skb)) { 3988 kfree_skb_list(next); 3989 goto out; 3990 } 3991 3992 ieee80211_tx_stats(dev, skb->len); 3993 3994 ieee80211_xmit(sdata, sta, skb, 0); 3995 } 3996 goto out; 3997 out_free: 3998 kfree_skb(skb); 3999 out: 4000 rcu_read_unlock(); 4001 } 4002 4003 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4004 { 4005 struct ethhdr *eth; 4006 int err; 4007 4008 err = skb_ensure_writable(skb, ETH_HLEN); 4009 if (unlikely(err)) 4010 return err; 4011 4012 eth = (void *)skb->data; 4013 ether_addr_copy(eth->h_dest, sta->sta.addr); 4014 4015 return 0; 4016 } 4017 4018 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4019 struct net_device *dev) 4020 { 4021 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4022 const struct ethhdr *eth = (void *)skb->data; 4023 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4024 __be16 ethertype; 4025 4026 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4027 return false; 4028 4029 switch (sdata->vif.type) { 4030 case NL80211_IFTYPE_AP_VLAN: 4031 if (sdata->u.vlan.sta) 4032 return false; 4033 if (sdata->wdev.use_4addr) 4034 return false; 4035 /* fall through */ 4036 case NL80211_IFTYPE_AP: 4037 /* check runtime toggle for this bss */ 4038 if (!sdata->bss->multicast_to_unicast) 4039 return false; 4040 break; 4041 default: 4042 return false; 4043 } 4044 4045 /* multicast to unicast conversion only for some payload */ 4046 ethertype = eth->h_proto; 4047 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4048 ethertype = ethvlan->h_vlan_encapsulated_proto; 4049 switch (ethertype) { 4050 case htons(ETH_P_ARP): 4051 case htons(ETH_P_IP): 4052 case htons(ETH_P_IPV6): 4053 break; 4054 default: 4055 return false; 4056 } 4057 4058 return true; 4059 } 4060 4061 static void 4062 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4063 struct sk_buff_head *queue) 4064 { 4065 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4066 struct ieee80211_local *local = sdata->local; 4067 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4068 struct sta_info *sta, *first = NULL; 4069 struct sk_buff *cloned_skb; 4070 4071 rcu_read_lock(); 4072 4073 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4074 if (sdata != sta->sdata) 4075 /* AP-VLAN mismatch */ 4076 continue; 4077 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4078 /* do not send back to source */ 4079 continue; 4080 if (!first) { 4081 first = sta; 4082 continue; 4083 } 4084 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4085 if (!cloned_skb) 4086 goto multicast; 4087 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4088 dev_kfree_skb(cloned_skb); 4089 goto multicast; 4090 } 4091 __skb_queue_tail(queue, cloned_skb); 4092 } 4093 4094 if (likely(first)) { 4095 if (unlikely(ieee80211_change_da(skb, first))) 4096 goto multicast; 4097 __skb_queue_tail(queue, skb); 4098 } else { 4099 /* no STA connected, drop */ 4100 kfree_skb(skb); 4101 skb = NULL; 4102 } 4103 4104 goto out; 4105 multicast: 4106 __skb_queue_purge(queue); 4107 __skb_queue_tail(queue, skb); 4108 out: 4109 rcu_read_unlock(); 4110 } 4111 4112 /** 4113 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4114 * @skb: packet to be sent 4115 * @dev: incoming interface 4116 * 4117 * On failure skb will be freed. 4118 */ 4119 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4120 struct net_device *dev) 4121 { 4122 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4123 struct sk_buff_head queue; 4124 4125 __skb_queue_head_init(&queue); 4126 ieee80211_convert_to_unicast(skb, dev, &queue); 4127 while ((skb = __skb_dequeue(&queue))) 4128 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4129 } else { 4130 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4131 } 4132 4133 return NETDEV_TX_OK; 4134 } 4135 4136 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4137 struct sk_buff *skb, int led_len, 4138 struct sta_info *sta, 4139 bool txpending) 4140 { 4141 struct ieee80211_local *local = sdata->local; 4142 struct ieee80211_tx_control control = {}; 4143 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4144 struct ieee80211_sta *pubsta = NULL; 4145 unsigned long flags; 4146 int q = info->hw_queue; 4147 4148 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4149 return true; 4150 4151 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4152 4153 if (local->queue_stop_reasons[q] || 4154 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4155 if (txpending) 4156 skb_queue_head(&local->pending[q], skb); 4157 else 4158 skb_queue_tail(&local->pending[q], skb); 4159 4160 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4161 4162 return false; 4163 } 4164 4165 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4166 4167 if (sta && sta->uploaded) 4168 pubsta = &sta->sta; 4169 4170 control.sta = pubsta; 4171 4172 drv_tx(local, &control, skb); 4173 4174 return true; 4175 } 4176 4177 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4178 struct net_device *dev, struct sta_info *sta, 4179 struct sk_buff *skb) 4180 { 4181 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4182 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4183 struct ieee80211_local *local = sdata->local; 4184 bool authorized = false; 4185 bool multicast; 4186 unsigned char *ra = ehdr->h_dest; 4187 4188 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4189 sta = NULL; 4190 4191 if (sdata->vif.type == NL80211_IFTYPE_STATION && 4192 (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER))) 4193 ra = sdata->u.mgd.bssid; 4194 4195 if (!is_valid_ether_addr(ra)) 4196 goto out_free; 4197 4198 multicast = is_multicast_ether_addr(ra); 4199 4200 if (sta) 4201 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 4202 4203 if (!multicast && !authorized && 4204 (ehdr->h_proto != sdata->control_port_protocol || 4205 !ether_addr_equal(sdata->vif.addr, ehdr->h_source))) 4206 goto out_free; 4207 4208 if (multicast && sdata->vif.type == NL80211_IFTYPE_AP && 4209 !atomic_read(&sdata->u.ap.num_mcast_sta)) 4210 goto out_free; 4211 4212 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4213 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4214 goto out_free; 4215 4216 if (unlikely(!multicast && skb->sk && 4217 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4218 ieee80211_store_ack_skb(local, skb, &info->flags); 4219 4220 memset(info, 0, sizeof(*info)); 4221 4222 if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) { 4223 if (sdata->control_port_no_encrypt) 4224 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4225 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 4226 } 4227 4228 if (multicast) 4229 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4230 4231 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4232 4233 ieee80211_tx_stats(dev, skb->len); 4234 4235 if (sta) { 4236 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4237 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4238 } 4239 4240 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4241 sdata = container_of(sdata->bss, 4242 struct ieee80211_sub_if_data, u.ap); 4243 4244 info->control.flags |= IEEE80211_TX_CTRL_HW_80211_ENCAP; 4245 info->control.vif = &sdata->vif; 4246 4247 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4248 4249 return; 4250 4251 out_free: 4252 kfree_skb(skb); 4253 } 4254 4255 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4256 struct net_device *dev) 4257 { 4258 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4259 struct sta_info *sta; 4260 4261 if (WARN_ON(!sdata->hw_80211_encap)) { 4262 kfree_skb(skb); 4263 return NETDEV_TX_OK; 4264 } 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 else 4276 ieee80211_8023_xmit(sdata, dev, sta, skb); 4277 4278 rcu_read_unlock(); 4279 4280 return NETDEV_TX_OK; 4281 } 4282 4283 struct sk_buff * 4284 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4285 struct sk_buff *skb, u32 info_flags) 4286 { 4287 struct ieee80211_hdr *hdr; 4288 struct ieee80211_tx_data tx = { 4289 .local = sdata->local, 4290 .sdata = sdata, 4291 }; 4292 struct sta_info *sta; 4293 4294 rcu_read_lock(); 4295 4296 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4297 kfree_skb(skb); 4298 skb = ERR_PTR(-EINVAL); 4299 goto out; 4300 } 4301 4302 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0); 4303 if (IS_ERR(skb)) 4304 goto out; 4305 4306 hdr = (void *)skb->data; 4307 tx.sta = sta_info_get(sdata, hdr->addr1); 4308 tx.skb = skb; 4309 4310 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4311 rcu_read_unlock(); 4312 kfree_skb(skb); 4313 return ERR_PTR(-EINVAL); 4314 } 4315 4316 out: 4317 rcu_read_unlock(); 4318 return skb; 4319 } 4320 4321 /* 4322 * ieee80211_clear_tx_pending may not be called in a context where 4323 * it is possible that it packets could come in again. 4324 */ 4325 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4326 { 4327 struct sk_buff *skb; 4328 int i; 4329 4330 for (i = 0; i < local->hw.queues; i++) { 4331 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4332 ieee80211_free_txskb(&local->hw, skb); 4333 } 4334 } 4335 4336 /* 4337 * Returns false if the frame couldn't be transmitted but was queued instead, 4338 * which in this case means re-queued -- take as an indication to stop sending 4339 * more pending frames. 4340 */ 4341 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4342 struct sk_buff *skb) 4343 { 4344 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4345 struct ieee80211_sub_if_data *sdata; 4346 struct sta_info *sta; 4347 struct ieee80211_hdr *hdr; 4348 bool result; 4349 struct ieee80211_chanctx_conf *chanctx_conf; 4350 4351 sdata = vif_to_sdata(info->control.vif); 4352 4353 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 4354 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4355 if (unlikely(!chanctx_conf)) { 4356 dev_kfree_skb(skb); 4357 return true; 4358 } 4359 info->band = chanctx_conf->def.chan->band; 4360 result = ieee80211_tx(sdata, NULL, skb, true, 0); 4361 } else if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) { 4362 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4363 dev_kfree_skb(skb); 4364 return true; 4365 } 4366 4367 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4368 sta = NULL; 4369 4370 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4371 } else { 4372 struct sk_buff_head skbs; 4373 4374 __skb_queue_head_init(&skbs); 4375 __skb_queue_tail(&skbs, skb); 4376 4377 hdr = (struct ieee80211_hdr *)skb->data; 4378 sta = sta_info_get(sdata, hdr->addr1); 4379 4380 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4381 } 4382 4383 return result; 4384 } 4385 4386 /* 4387 * Transmit all pending packets. Called from tasklet. 4388 */ 4389 void ieee80211_tx_pending(unsigned long data) 4390 { 4391 struct ieee80211_local *local = (struct ieee80211_local *)data; 4392 unsigned long flags; 4393 int i; 4394 bool txok; 4395 4396 rcu_read_lock(); 4397 4398 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4399 for (i = 0; i < local->hw.queues; i++) { 4400 /* 4401 * If queue is stopped by something other than due to pending 4402 * frames, or we have no pending frames, proceed to next queue. 4403 */ 4404 if (local->queue_stop_reasons[i] || 4405 skb_queue_empty(&local->pending[i])) 4406 continue; 4407 4408 while (!skb_queue_empty(&local->pending[i])) { 4409 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4410 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4411 4412 if (WARN_ON(!info->control.vif)) { 4413 ieee80211_free_txskb(&local->hw, skb); 4414 continue; 4415 } 4416 4417 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4418 flags); 4419 4420 txok = ieee80211_tx_pending_skb(local, skb); 4421 spin_lock_irqsave(&local->queue_stop_reason_lock, 4422 flags); 4423 if (!txok) 4424 break; 4425 } 4426 4427 if (skb_queue_empty(&local->pending[i])) 4428 ieee80211_propagate_queue_wake(local, i); 4429 } 4430 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4431 4432 rcu_read_unlock(); 4433 } 4434 4435 /* functions for drivers to get certain frames */ 4436 4437 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4438 struct ps_data *ps, struct sk_buff *skb, 4439 bool is_template) 4440 { 4441 u8 *pos, *tim; 4442 int aid0 = 0; 4443 int i, have_bits = 0, n1, n2; 4444 4445 /* Generate bitmap for TIM only if there are any STAs in power save 4446 * mode. */ 4447 if (atomic_read(&ps->num_sta_ps) > 0) 4448 /* in the hope that this is faster than 4449 * checking byte-for-byte */ 4450 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4451 IEEE80211_MAX_AID+1); 4452 if (!is_template) { 4453 if (ps->dtim_count == 0) 4454 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4455 else 4456 ps->dtim_count--; 4457 } 4458 4459 tim = pos = skb_put(skb, 6); 4460 *pos++ = WLAN_EID_TIM; 4461 *pos++ = 4; 4462 *pos++ = ps->dtim_count; 4463 *pos++ = sdata->vif.bss_conf.dtim_period; 4464 4465 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4466 aid0 = 1; 4467 4468 ps->dtim_bc_mc = aid0 == 1; 4469 4470 if (have_bits) { 4471 /* Find largest even number N1 so that bits numbered 1 through 4472 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4473 * (N2 + 1) x 8 through 2007 are 0. */ 4474 n1 = 0; 4475 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4476 if (ps->tim[i]) { 4477 n1 = i & 0xfe; 4478 break; 4479 } 4480 } 4481 n2 = n1; 4482 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4483 if (ps->tim[i]) { 4484 n2 = i; 4485 break; 4486 } 4487 } 4488 4489 /* Bitmap control */ 4490 *pos++ = n1 | aid0; 4491 /* Part Virt Bitmap */ 4492 skb_put(skb, n2 - n1); 4493 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4494 4495 tim[1] = n2 - n1 + 4; 4496 } else { 4497 *pos++ = aid0; /* Bitmap control */ 4498 *pos++ = 0; /* Part Virt Bitmap */ 4499 } 4500 } 4501 4502 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4503 struct ps_data *ps, struct sk_buff *skb, 4504 bool is_template) 4505 { 4506 struct ieee80211_local *local = sdata->local; 4507 4508 /* 4509 * Not very nice, but we want to allow the driver to call 4510 * ieee80211_beacon_get() as a response to the set_tim() 4511 * callback. That, however, is already invoked under the 4512 * sta_lock to guarantee consistent and race-free update 4513 * of the tim bitmap in mac80211 and the driver. 4514 */ 4515 if (local->tim_in_locked_section) { 4516 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4517 } else { 4518 spin_lock_bh(&local->tim_lock); 4519 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4520 spin_unlock_bh(&local->tim_lock); 4521 } 4522 4523 return 0; 4524 } 4525 4526 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4527 struct beacon_data *beacon) 4528 { 4529 struct probe_resp *resp; 4530 u8 *beacon_data; 4531 size_t beacon_data_len; 4532 int i; 4533 u8 count = beacon->csa_current_counter; 4534 4535 switch (sdata->vif.type) { 4536 case NL80211_IFTYPE_AP: 4537 beacon_data = beacon->tail; 4538 beacon_data_len = beacon->tail_len; 4539 break; 4540 case NL80211_IFTYPE_ADHOC: 4541 beacon_data = beacon->head; 4542 beacon_data_len = beacon->head_len; 4543 break; 4544 case NL80211_IFTYPE_MESH_POINT: 4545 beacon_data = beacon->head; 4546 beacon_data_len = beacon->head_len; 4547 break; 4548 default: 4549 return; 4550 } 4551 4552 rcu_read_lock(); 4553 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4554 resp = rcu_dereference(sdata->u.ap.probe_resp); 4555 4556 if (beacon->csa_counter_offsets[i]) { 4557 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4558 beacon_data_len)) { 4559 rcu_read_unlock(); 4560 return; 4561 } 4562 4563 beacon_data[beacon->csa_counter_offsets[i]] = count; 4564 } 4565 4566 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4567 resp->data[resp->csa_counter_offsets[i]] = count; 4568 } 4569 rcu_read_unlock(); 4570 } 4571 4572 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4573 { 4574 beacon->csa_current_counter--; 4575 4576 /* the counter should never reach 0 */ 4577 WARN_ON_ONCE(!beacon->csa_current_counter); 4578 4579 return beacon->csa_current_counter; 4580 } 4581 4582 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4583 { 4584 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4585 struct beacon_data *beacon = NULL; 4586 u8 count = 0; 4587 4588 rcu_read_lock(); 4589 4590 if (sdata->vif.type == NL80211_IFTYPE_AP) 4591 beacon = rcu_dereference(sdata->u.ap.beacon); 4592 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4593 beacon = rcu_dereference(sdata->u.ibss.presp); 4594 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4595 beacon = rcu_dereference(sdata->u.mesh.beacon); 4596 4597 if (!beacon) 4598 goto unlock; 4599 4600 count = __ieee80211_csa_update_counter(beacon); 4601 4602 unlock: 4603 rcu_read_unlock(); 4604 return count; 4605 } 4606 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4607 4608 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4609 { 4610 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4611 struct beacon_data *beacon = NULL; 4612 4613 rcu_read_lock(); 4614 4615 if (sdata->vif.type == NL80211_IFTYPE_AP) 4616 beacon = rcu_dereference(sdata->u.ap.beacon); 4617 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4618 beacon = rcu_dereference(sdata->u.ibss.presp); 4619 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4620 beacon = rcu_dereference(sdata->u.mesh.beacon); 4621 4622 if (!beacon) 4623 goto unlock; 4624 4625 if (counter < beacon->csa_current_counter) 4626 beacon->csa_current_counter = counter; 4627 4628 unlock: 4629 rcu_read_unlock(); 4630 } 4631 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4632 4633 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4634 { 4635 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4636 struct beacon_data *beacon = NULL; 4637 u8 *beacon_data; 4638 size_t beacon_data_len; 4639 int ret = false; 4640 4641 if (!ieee80211_sdata_running(sdata)) 4642 return false; 4643 4644 rcu_read_lock(); 4645 if (vif->type == NL80211_IFTYPE_AP) { 4646 struct ieee80211_if_ap *ap = &sdata->u.ap; 4647 4648 beacon = rcu_dereference(ap->beacon); 4649 if (WARN_ON(!beacon || !beacon->tail)) 4650 goto out; 4651 beacon_data = beacon->tail; 4652 beacon_data_len = beacon->tail_len; 4653 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4654 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4655 4656 beacon = rcu_dereference(ifibss->presp); 4657 if (!beacon) 4658 goto out; 4659 4660 beacon_data = beacon->head; 4661 beacon_data_len = beacon->head_len; 4662 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4663 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4664 4665 beacon = rcu_dereference(ifmsh->beacon); 4666 if (!beacon) 4667 goto out; 4668 4669 beacon_data = beacon->head; 4670 beacon_data_len = beacon->head_len; 4671 } else { 4672 WARN_ON(1); 4673 goto out; 4674 } 4675 4676 if (!beacon->csa_counter_offsets[0]) 4677 goto out; 4678 4679 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4680 goto out; 4681 4682 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4683 ret = true; 4684 out: 4685 rcu_read_unlock(); 4686 4687 return ret; 4688 } 4689 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4690 4691 static int ieee80211_beacon_protect(struct sk_buff *skb, 4692 struct ieee80211_local *local, 4693 struct ieee80211_sub_if_data *sdata) 4694 { 4695 ieee80211_tx_result res; 4696 struct ieee80211_tx_data tx; 4697 struct sk_buff *check_skb; 4698 4699 memset(&tx, 0, sizeof(tx)); 4700 tx.key = rcu_dereference(sdata->default_beacon_key); 4701 if (!tx.key) 4702 return 0; 4703 tx.local = local; 4704 tx.sdata = sdata; 4705 __skb_queue_head_init(&tx.skbs); 4706 __skb_queue_tail(&tx.skbs, skb); 4707 res = ieee80211_tx_h_encrypt(&tx); 4708 check_skb = __skb_dequeue(&tx.skbs); 4709 /* we may crash after this, but it'd be a bug in crypto */ 4710 WARN_ON(check_skb != skb); 4711 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4712 return -EINVAL; 4713 4714 return 0; 4715 } 4716 4717 static struct sk_buff * 4718 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4719 struct ieee80211_vif *vif, 4720 struct ieee80211_mutable_offsets *offs, 4721 bool is_template) 4722 { 4723 struct ieee80211_local *local = hw_to_local(hw); 4724 struct beacon_data *beacon = NULL; 4725 struct sk_buff *skb = NULL; 4726 struct ieee80211_tx_info *info; 4727 struct ieee80211_sub_if_data *sdata = NULL; 4728 enum nl80211_band band; 4729 struct ieee80211_tx_rate_control txrc; 4730 struct ieee80211_chanctx_conf *chanctx_conf; 4731 int csa_off_base = 0; 4732 4733 rcu_read_lock(); 4734 4735 sdata = vif_to_sdata(vif); 4736 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4737 4738 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4739 goto out; 4740 4741 if (offs) 4742 memset(offs, 0, sizeof(*offs)); 4743 4744 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4745 struct ieee80211_if_ap *ap = &sdata->u.ap; 4746 4747 beacon = rcu_dereference(ap->beacon); 4748 if (beacon) { 4749 if (beacon->csa_counter_offsets[0]) { 4750 if (!is_template) 4751 __ieee80211_csa_update_counter(beacon); 4752 4753 ieee80211_set_csa(sdata, beacon); 4754 } 4755 4756 /* 4757 * headroom, head length, 4758 * tail length and maximum TIM length 4759 */ 4760 skb = dev_alloc_skb(local->tx_headroom + 4761 beacon->head_len + 4762 beacon->tail_len + 256 + 4763 local->hw.extra_beacon_tailroom); 4764 if (!skb) 4765 goto out; 4766 4767 skb_reserve(skb, local->tx_headroom); 4768 skb_put_data(skb, beacon->head, beacon->head_len); 4769 4770 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4771 is_template); 4772 4773 if (offs) { 4774 offs->tim_offset = beacon->head_len; 4775 offs->tim_length = skb->len - beacon->head_len; 4776 4777 /* for AP the csa offsets are from tail */ 4778 csa_off_base = skb->len; 4779 } 4780 4781 if (beacon->tail) 4782 skb_put_data(skb, beacon->tail, 4783 beacon->tail_len); 4784 4785 if (ieee80211_beacon_protect(skb, local, sdata) < 0) 4786 goto out; 4787 } else 4788 goto out; 4789 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4790 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4791 struct ieee80211_hdr *hdr; 4792 4793 beacon = rcu_dereference(ifibss->presp); 4794 if (!beacon) 4795 goto out; 4796 4797 if (beacon->csa_counter_offsets[0]) { 4798 if (!is_template) 4799 __ieee80211_csa_update_counter(beacon); 4800 4801 ieee80211_set_csa(sdata, beacon); 4802 } 4803 4804 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4805 local->hw.extra_beacon_tailroom); 4806 if (!skb) 4807 goto out; 4808 skb_reserve(skb, local->tx_headroom); 4809 skb_put_data(skb, beacon->head, beacon->head_len); 4810 4811 hdr = (struct ieee80211_hdr *) skb->data; 4812 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4813 IEEE80211_STYPE_BEACON); 4814 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4815 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4816 4817 beacon = rcu_dereference(ifmsh->beacon); 4818 if (!beacon) 4819 goto out; 4820 4821 if (beacon->csa_counter_offsets[0]) { 4822 if (!is_template) 4823 /* TODO: For mesh csa_counter is in TU, so 4824 * decrementing it by one isn't correct, but 4825 * for now we leave it consistent with overall 4826 * mac80211's behavior. 4827 */ 4828 __ieee80211_csa_update_counter(beacon); 4829 4830 ieee80211_set_csa(sdata, beacon); 4831 } 4832 4833 if (ifmsh->sync_ops) 4834 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4835 4836 skb = dev_alloc_skb(local->tx_headroom + 4837 beacon->head_len + 4838 256 + /* TIM IE */ 4839 beacon->tail_len + 4840 local->hw.extra_beacon_tailroom); 4841 if (!skb) 4842 goto out; 4843 skb_reserve(skb, local->tx_headroom); 4844 skb_put_data(skb, beacon->head, beacon->head_len); 4845 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4846 4847 if (offs) { 4848 offs->tim_offset = beacon->head_len; 4849 offs->tim_length = skb->len - beacon->head_len; 4850 } 4851 4852 skb_put_data(skb, beacon->tail, beacon->tail_len); 4853 } else { 4854 WARN_ON(1); 4855 goto out; 4856 } 4857 4858 /* CSA offsets */ 4859 if (offs && beacon) { 4860 int i; 4861 4862 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4863 u16 csa_off = beacon->csa_counter_offsets[i]; 4864 4865 if (!csa_off) 4866 continue; 4867 4868 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4869 } 4870 } 4871 4872 band = chanctx_conf->def.chan->band; 4873 4874 info = IEEE80211_SKB_CB(skb); 4875 4876 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4877 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4878 info->band = band; 4879 4880 memset(&txrc, 0, sizeof(txrc)); 4881 txrc.hw = hw; 4882 txrc.sband = local->hw.wiphy->bands[band]; 4883 txrc.bss_conf = &sdata->vif.bss_conf; 4884 txrc.skb = skb; 4885 txrc.reported_rate.idx = -1; 4886 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4887 txrc.bss = true; 4888 rate_control_get_rate(sdata, NULL, &txrc); 4889 4890 info->control.vif = vif; 4891 4892 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4893 IEEE80211_TX_CTL_ASSIGN_SEQ | 4894 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4895 out: 4896 rcu_read_unlock(); 4897 return skb; 4898 4899 } 4900 4901 struct sk_buff * 4902 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4903 struct ieee80211_vif *vif, 4904 struct ieee80211_mutable_offsets *offs) 4905 { 4906 return __ieee80211_beacon_get(hw, vif, offs, true); 4907 } 4908 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4909 4910 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4911 struct ieee80211_vif *vif, 4912 u16 *tim_offset, u16 *tim_length) 4913 { 4914 struct ieee80211_mutable_offsets offs = {}; 4915 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4916 struct sk_buff *copy; 4917 struct ieee80211_supported_band *sband; 4918 int shift; 4919 4920 if (!bcn) 4921 return bcn; 4922 4923 if (tim_offset) 4924 *tim_offset = offs.tim_offset; 4925 4926 if (tim_length) 4927 *tim_length = offs.tim_length; 4928 4929 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4930 !hw_to_local(hw)->monitors) 4931 return bcn; 4932 4933 /* send a copy to monitor interfaces */ 4934 copy = skb_copy(bcn, GFP_ATOMIC); 4935 if (!copy) 4936 return bcn; 4937 4938 shift = ieee80211_vif_get_shift(vif); 4939 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4940 if (!sband) 4941 return bcn; 4942 4943 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4944 NULL); 4945 4946 return bcn; 4947 } 4948 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4949 4950 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4951 struct ieee80211_vif *vif) 4952 { 4953 struct ieee80211_if_ap *ap = NULL; 4954 struct sk_buff *skb = NULL; 4955 struct probe_resp *presp = NULL; 4956 struct ieee80211_hdr *hdr; 4957 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4958 4959 if (sdata->vif.type != NL80211_IFTYPE_AP) 4960 return NULL; 4961 4962 rcu_read_lock(); 4963 4964 ap = &sdata->u.ap; 4965 presp = rcu_dereference(ap->probe_resp); 4966 if (!presp) 4967 goto out; 4968 4969 skb = dev_alloc_skb(presp->len); 4970 if (!skb) 4971 goto out; 4972 4973 skb_put_data(skb, presp->data, presp->len); 4974 4975 hdr = (struct ieee80211_hdr *) skb->data; 4976 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4977 4978 out: 4979 rcu_read_unlock(); 4980 return skb; 4981 } 4982 EXPORT_SYMBOL(ieee80211_proberesp_get); 4983 4984 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4985 struct ieee80211_vif *vif) 4986 { 4987 struct ieee80211_sub_if_data *sdata; 4988 struct ieee80211_if_managed *ifmgd; 4989 struct ieee80211_pspoll *pspoll; 4990 struct ieee80211_local *local; 4991 struct sk_buff *skb; 4992 4993 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4994 return NULL; 4995 4996 sdata = vif_to_sdata(vif); 4997 ifmgd = &sdata->u.mgd; 4998 local = sdata->local; 4999 5000 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5001 if (!skb) 5002 return NULL; 5003 5004 skb_reserve(skb, local->hw.extra_tx_headroom); 5005 5006 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5007 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5008 IEEE80211_STYPE_PSPOLL); 5009 pspoll->aid = cpu_to_le16(ifmgd->aid); 5010 5011 /* aid in PS-Poll has its two MSBs each set to 1 */ 5012 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5013 5014 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 5015 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5016 5017 return skb; 5018 } 5019 EXPORT_SYMBOL(ieee80211_pspoll_get); 5020 5021 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5022 struct ieee80211_vif *vif, 5023 bool qos_ok) 5024 { 5025 struct ieee80211_hdr_3addr *nullfunc; 5026 struct ieee80211_sub_if_data *sdata; 5027 struct ieee80211_if_managed *ifmgd; 5028 struct ieee80211_local *local; 5029 struct sk_buff *skb; 5030 bool qos = false; 5031 5032 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5033 return NULL; 5034 5035 sdata = vif_to_sdata(vif); 5036 ifmgd = &sdata->u.mgd; 5037 local = sdata->local; 5038 5039 if (qos_ok) { 5040 struct sta_info *sta; 5041 5042 rcu_read_lock(); 5043 sta = sta_info_get(sdata, ifmgd->bssid); 5044 qos = sta && sta->sta.wme; 5045 rcu_read_unlock(); 5046 } 5047 5048 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5049 sizeof(*nullfunc) + 2); 5050 if (!skb) 5051 return NULL; 5052 5053 skb_reserve(skb, local->hw.extra_tx_headroom); 5054 5055 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5056 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5057 IEEE80211_STYPE_NULLFUNC | 5058 IEEE80211_FCTL_TODS); 5059 if (qos) { 5060 __le16 qoshdr = cpu_to_le16(7); 5061 5062 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5063 IEEE80211_STYPE_NULLFUNC) != 5064 IEEE80211_STYPE_QOS_NULLFUNC); 5065 nullfunc->frame_control |= 5066 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5067 skb->priority = 7; 5068 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5069 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5070 } 5071 5072 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5073 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5074 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5075 5076 return skb; 5077 } 5078 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5079 5080 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5081 const u8 *src_addr, 5082 const u8 *ssid, size_t ssid_len, 5083 size_t tailroom) 5084 { 5085 struct ieee80211_local *local = hw_to_local(hw); 5086 struct ieee80211_hdr_3addr *hdr; 5087 struct sk_buff *skb; 5088 size_t ie_ssid_len; 5089 u8 *pos; 5090 5091 ie_ssid_len = 2 + ssid_len; 5092 5093 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5094 ie_ssid_len + tailroom); 5095 if (!skb) 5096 return NULL; 5097 5098 skb_reserve(skb, local->hw.extra_tx_headroom); 5099 5100 hdr = skb_put_zero(skb, sizeof(*hdr)); 5101 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5102 IEEE80211_STYPE_PROBE_REQ); 5103 eth_broadcast_addr(hdr->addr1); 5104 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5105 eth_broadcast_addr(hdr->addr3); 5106 5107 pos = skb_put(skb, ie_ssid_len); 5108 *pos++ = WLAN_EID_SSID; 5109 *pos++ = ssid_len; 5110 if (ssid_len) 5111 memcpy(pos, ssid, ssid_len); 5112 pos += ssid_len; 5113 5114 return skb; 5115 } 5116 EXPORT_SYMBOL(ieee80211_probereq_get); 5117 5118 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5119 const void *frame, size_t frame_len, 5120 const struct ieee80211_tx_info *frame_txctl, 5121 struct ieee80211_rts *rts) 5122 { 5123 const struct ieee80211_hdr *hdr = frame; 5124 5125 rts->frame_control = 5126 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5127 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5128 frame_txctl); 5129 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5130 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5131 } 5132 EXPORT_SYMBOL(ieee80211_rts_get); 5133 5134 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5135 const void *frame, size_t frame_len, 5136 const struct ieee80211_tx_info *frame_txctl, 5137 struct ieee80211_cts *cts) 5138 { 5139 const struct ieee80211_hdr *hdr = frame; 5140 5141 cts->frame_control = 5142 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5143 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5144 frame_len, frame_txctl); 5145 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5146 } 5147 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5148 5149 struct sk_buff * 5150 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5151 struct ieee80211_vif *vif) 5152 { 5153 struct ieee80211_local *local = hw_to_local(hw); 5154 struct sk_buff *skb = NULL; 5155 struct ieee80211_tx_data tx; 5156 struct ieee80211_sub_if_data *sdata; 5157 struct ps_data *ps; 5158 struct ieee80211_tx_info *info; 5159 struct ieee80211_chanctx_conf *chanctx_conf; 5160 5161 sdata = vif_to_sdata(vif); 5162 5163 rcu_read_lock(); 5164 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5165 5166 if (!chanctx_conf) 5167 goto out; 5168 5169 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5170 struct beacon_data *beacon = 5171 rcu_dereference(sdata->u.ap.beacon); 5172 5173 if (!beacon || !beacon->head) 5174 goto out; 5175 5176 ps = &sdata->u.ap.ps; 5177 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5178 ps = &sdata->u.mesh.ps; 5179 } else { 5180 goto out; 5181 } 5182 5183 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5184 goto out; /* send buffered bc/mc only after DTIM beacon */ 5185 5186 while (1) { 5187 skb = skb_dequeue(&ps->bc_buf); 5188 if (!skb) 5189 goto out; 5190 local->total_ps_buffered--; 5191 5192 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5193 struct ieee80211_hdr *hdr = 5194 (struct ieee80211_hdr *) skb->data; 5195 /* more buffered multicast/broadcast frames ==> set 5196 * MoreData flag in IEEE 802.11 header to inform PS 5197 * STAs */ 5198 hdr->frame_control |= 5199 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5200 } 5201 5202 if (sdata->vif.type == NL80211_IFTYPE_AP) 5203 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5204 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5205 break; 5206 ieee80211_free_txskb(hw, skb); 5207 } 5208 5209 info = IEEE80211_SKB_CB(skb); 5210 5211 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5212 info->band = chanctx_conf->def.chan->band; 5213 5214 if (invoke_tx_handlers(&tx)) 5215 skb = NULL; 5216 out: 5217 rcu_read_unlock(); 5218 5219 return skb; 5220 } 5221 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5222 5223 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5224 { 5225 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5226 struct ieee80211_sub_if_data *sdata = sta->sdata; 5227 struct ieee80211_local *local = sdata->local; 5228 int ret; 5229 u32 queues; 5230 5231 lockdep_assert_held(&local->sta_mtx); 5232 5233 /* only some cases are supported right now */ 5234 switch (sdata->vif.type) { 5235 case NL80211_IFTYPE_STATION: 5236 case NL80211_IFTYPE_AP: 5237 case NL80211_IFTYPE_AP_VLAN: 5238 break; 5239 default: 5240 WARN_ON(1); 5241 return -EINVAL; 5242 } 5243 5244 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5245 return -EINVAL; 5246 5247 if (sta->reserved_tid == tid) { 5248 ret = 0; 5249 goto out; 5250 } 5251 5252 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5253 sdata_err(sdata, "TID reservation already active\n"); 5254 ret = -EALREADY; 5255 goto out; 5256 } 5257 5258 ieee80211_stop_vif_queues(sdata->local, sdata, 5259 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5260 5261 synchronize_net(); 5262 5263 /* Tear down BA sessions so we stop aggregating on this TID */ 5264 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5265 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5266 __ieee80211_stop_tx_ba_session(sta, tid, 5267 AGG_STOP_LOCAL_REQUEST); 5268 } 5269 5270 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5271 __ieee80211_flush_queues(local, sdata, queues, false); 5272 5273 sta->reserved_tid = tid; 5274 5275 ieee80211_wake_vif_queues(local, sdata, 5276 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5277 5278 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5279 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5280 5281 ret = 0; 5282 out: 5283 return ret; 5284 } 5285 EXPORT_SYMBOL(ieee80211_reserve_tid); 5286 5287 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5288 { 5289 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5290 struct ieee80211_sub_if_data *sdata = sta->sdata; 5291 5292 lockdep_assert_held(&sdata->local->sta_mtx); 5293 5294 /* only some cases are supported right now */ 5295 switch (sdata->vif.type) { 5296 case NL80211_IFTYPE_STATION: 5297 case NL80211_IFTYPE_AP: 5298 case NL80211_IFTYPE_AP_VLAN: 5299 break; 5300 default: 5301 WARN_ON(1); 5302 return; 5303 } 5304 5305 if (tid != sta->reserved_tid) { 5306 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5307 return; 5308 } 5309 5310 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5311 } 5312 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5313 5314 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5315 struct sk_buff *skb, int tid, 5316 enum nl80211_band band, u32 txdata_flags) 5317 { 5318 int ac = ieee80211_ac_from_tid(tid); 5319 5320 skb_reset_mac_header(skb); 5321 skb_set_queue_mapping(skb, ac); 5322 skb->priority = tid; 5323 5324 skb->dev = sdata->dev; 5325 5326 /* 5327 * The other path calling ieee80211_xmit is from the tasklet, 5328 * and while we can handle concurrent transmissions locking 5329 * requirements are that we do not come into tx with bhs on. 5330 */ 5331 local_bh_disable(); 5332 IEEE80211_SKB_CB(skb)->band = band; 5333 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 5334 local_bh_enable(); 5335 } 5336 5337 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5338 const u8 *buf, size_t len, 5339 const u8 *dest, __be16 proto, bool unencrypted) 5340 { 5341 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5342 struct ieee80211_local *local = sdata->local; 5343 struct sk_buff *skb; 5344 struct ethhdr *ehdr; 5345 u32 ctrl_flags = 0; 5346 u32 flags; 5347 5348 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5349 * or Pre-Authentication 5350 */ 5351 if (proto != sdata->control_port_protocol && 5352 proto != cpu_to_be16(ETH_P_PREAUTH)) 5353 return -EINVAL; 5354 5355 if (proto == sdata->control_port_protocol) 5356 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 5357 5358 if (unencrypted) 5359 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 5360 else 5361 flags = 0; 5362 5363 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5364 sizeof(struct ethhdr) + len); 5365 if (!skb) 5366 return -ENOMEM; 5367 5368 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5369 5370 skb_put_data(skb, buf, len); 5371 5372 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5373 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5374 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5375 ehdr->h_proto = proto; 5376 5377 skb->dev = dev; 5378 skb->protocol = htons(ETH_P_802_3); 5379 skb_reset_network_header(skb); 5380 skb_reset_mac_header(skb); 5381 5382 local_bh_disable(); 5383 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags); 5384 local_bh_enable(); 5385 5386 return 0; 5387 } 5388 5389 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5390 const u8 *buf, size_t len) 5391 { 5392 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5393 struct ieee80211_local *local = sdata->local; 5394 struct sk_buff *skb; 5395 5396 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5397 30 + /* header size */ 5398 18); /* 11s header size */ 5399 if (!skb) 5400 return -ENOMEM; 5401 5402 skb_reserve(skb, local->hw.extra_tx_headroom); 5403 skb_put_data(skb, buf, len); 5404 5405 skb->dev = dev; 5406 skb->protocol = htons(ETH_P_802_3); 5407 skb_reset_network_header(skb); 5408 skb_reset_mac_header(skb); 5409 5410 local_bh_disable(); 5411 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5412 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP); 5413 local_bh_enable(); 5414 5415 return 0; 5416 } 5417