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 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_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 else if (tx->sta && 596 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 597 tx->key = key; 598 else if (ieee80211_is_group_privacy_action(tx->skb) && 599 (key = rcu_dereference(tx->sdata->default_multicast_key))) 600 tx->key = key; 601 else if (ieee80211_is_mgmt(hdr->frame_control) && 602 is_multicast_ether_addr(hdr->addr1) && 603 ieee80211_is_robust_mgmt_frame(tx->skb) && 604 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 605 tx->key = key; 606 else if (is_multicast_ether_addr(hdr->addr1) && 607 (key = rcu_dereference(tx->sdata->default_multicast_key))) 608 tx->key = key; 609 else if (!is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_unicast_key))) 611 tx->key = key; 612 else 613 tx->key = NULL; 614 615 if (tx->key) { 616 bool skip_hw = false; 617 618 /* TODO: add threshold stuff again */ 619 620 switch (tx->key->conf.cipher) { 621 case WLAN_CIPHER_SUITE_WEP40: 622 case WLAN_CIPHER_SUITE_WEP104: 623 case WLAN_CIPHER_SUITE_TKIP: 624 if (!ieee80211_is_data_present(hdr->frame_control)) 625 tx->key = NULL; 626 break; 627 case WLAN_CIPHER_SUITE_CCMP: 628 case WLAN_CIPHER_SUITE_CCMP_256: 629 case WLAN_CIPHER_SUITE_GCMP: 630 case WLAN_CIPHER_SUITE_GCMP_256: 631 if (!ieee80211_is_data_present(hdr->frame_control) && 632 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 633 tx->skb) && 634 !ieee80211_is_group_privacy_action(tx->skb)) 635 tx->key = NULL; 636 else 637 skip_hw = (tx->key->conf.flags & 638 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 639 ieee80211_is_mgmt(hdr->frame_control); 640 break; 641 case WLAN_CIPHER_SUITE_AES_CMAC: 642 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 643 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 644 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 645 if (!ieee80211_is_mgmt(hdr->frame_control)) 646 tx->key = NULL; 647 break; 648 } 649 650 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 651 !ieee80211_is_deauth(hdr->frame_control))) 652 return TX_DROP; 653 654 if (!skip_hw && tx->key && 655 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 656 info->control.hw_key = &tx->key->conf; 657 } 658 659 return TX_CONTINUE; 660 } 661 662 static ieee80211_tx_result debug_noinline 663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 664 { 665 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 666 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 667 struct ieee80211_supported_band *sband; 668 u32 len; 669 struct ieee80211_tx_rate_control txrc; 670 struct ieee80211_sta_rates *ratetbl = NULL; 671 bool assoc = false; 672 673 memset(&txrc, 0, sizeof(txrc)); 674 675 sband = tx->local->hw.wiphy->bands[info->band]; 676 677 len = min_t(u32, tx->skb->len + FCS_LEN, 678 tx->local->hw.wiphy->frag_threshold); 679 680 /* set up the tx rate control struct we give the RC algo */ 681 txrc.hw = &tx->local->hw; 682 txrc.sband = sband; 683 txrc.bss_conf = &tx->sdata->vif.bss_conf; 684 txrc.skb = tx->skb; 685 txrc.reported_rate.idx = -1; 686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 687 688 if (tx->sdata->rc_has_mcs_mask[info->band]) 689 txrc.rate_idx_mcs_mask = 690 tx->sdata->rc_rateidx_mcs_mask[info->band]; 691 692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 695 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 696 697 /* set up RTS protection if desired */ 698 if (len > tx->local->hw.wiphy->rts_threshold) { 699 txrc.rts = true; 700 } 701 702 info->control.use_rts = txrc.rts; 703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 704 705 /* 706 * Use short preamble if the BSS can handle it, but not for 707 * management frames unless we know the receiver can handle 708 * that -- the management frame might be to a station that 709 * just wants a probe response. 710 */ 711 if (tx->sdata->vif.bss_conf.use_short_preamble && 712 (ieee80211_is_data(hdr->frame_control) || 713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 714 txrc.short_preamble = true; 715 716 info->control.short_preamble = txrc.short_preamble; 717 718 /* don't ask rate control when rate already injected via radiotap */ 719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 720 return TX_CONTINUE; 721 722 if (tx->sta) 723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 724 725 /* 726 * Lets not bother rate control if we're associated and cannot 727 * talk to the sta. This should not happen. 728 */ 729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 730 !rate_usable_index_exists(sband, &tx->sta->sta), 731 "%s: Dropped data frame as no usable bitrate found while " 732 "scanning and associated. Target station: " 733 "%pM on %d GHz band\n", 734 tx->sdata->name, hdr->addr1, 735 info->band ? 5 : 2)) 736 return TX_DROP; 737 738 /* 739 * If we're associated with the sta at this point we know we can at 740 * least send the frame at the lowest bit rate. 741 */ 742 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 743 744 if (tx->sta && !info->control.skip_table) 745 ratetbl = rcu_dereference(tx->sta->sta.rates); 746 747 if (unlikely(info->control.rates[0].idx < 0)) { 748 if (ratetbl) { 749 struct ieee80211_tx_rate rate = { 750 .idx = ratetbl->rate[0].idx, 751 .flags = ratetbl->rate[0].flags, 752 .count = ratetbl->rate[0].count 753 }; 754 755 if (ratetbl->rate[0].idx < 0) 756 return TX_DROP; 757 758 tx->rate = rate; 759 } else { 760 return TX_DROP; 761 } 762 } else { 763 tx->rate = info->control.rates[0]; 764 } 765 766 if (txrc.reported_rate.idx < 0) { 767 txrc.reported_rate = tx->rate; 768 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 } else if (tx->sta) 771 tx->sta->tx_stats.last_rate = txrc.reported_rate; 772 773 if (ratetbl) 774 return TX_CONTINUE; 775 776 if (unlikely(!info->control.rates[0].count)) 777 info->control.rates[0].count = 1; 778 779 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 780 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 781 info->control.rates[0].count = 1; 782 783 return TX_CONTINUE; 784 } 785 786 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 787 { 788 u16 *seq = &sta->tid_seq[tid]; 789 __le16 ret = cpu_to_le16(*seq); 790 791 /* Increase the sequence number. */ 792 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 793 794 return ret; 795 } 796 797 static ieee80211_tx_result debug_noinline 798 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 799 { 800 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 801 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 802 int tid; 803 804 /* 805 * Packet injection may want to control the sequence 806 * number, if we have no matching interface then we 807 * neither assign one ourselves nor ask the driver to. 808 */ 809 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 810 return TX_CONTINUE; 811 812 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 813 return TX_CONTINUE; 814 815 if (ieee80211_hdrlen(hdr->frame_control) < 24) 816 return TX_CONTINUE; 817 818 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 819 return TX_CONTINUE; 820 821 /* 822 * Anything but QoS data that has a sequence number field 823 * (is long enough) gets a sequence number from the global 824 * counter. QoS data frames with a multicast destination 825 * also use the global counter (802.11-2012 9.3.2.10). 826 */ 827 if (!ieee80211_is_data_qos(hdr->frame_control) || 828 is_multicast_ether_addr(hdr->addr1)) { 829 if (tx->flags & IEEE80211_TX_NO_SEQNO) 830 return TX_CONTINUE; 831 /* driver should assign sequence number */ 832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 833 /* for pure STA mode without beacons, we can do it */ 834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 835 tx->sdata->sequence_number += 0x10; 836 if (tx->sta) 837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 838 return TX_CONTINUE; 839 } 840 841 /* 842 * This should be true for injected/management frames only, for 843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 844 * above since they are not QoS-data frames. 845 */ 846 if (!tx->sta) 847 return TX_CONTINUE; 848 849 /* include per-STA, per-TID sequence counter */ 850 tid = ieee80211_get_tid(hdr); 851 tx->sta->tx_stats.msdu[tid]++; 852 853 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 854 855 return TX_CONTINUE; 856 } 857 858 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 859 struct sk_buff *skb, int hdrlen, 860 int frag_threshold) 861 { 862 struct ieee80211_local *local = tx->local; 863 struct ieee80211_tx_info *info; 864 struct sk_buff *tmp; 865 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 866 int pos = hdrlen + per_fragm; 867 int rem = skb->len - hdrlen - per_fragm; 868 869 if (WARN_ON(rem < 0)) 870 return -EINVAL; 871 872 /* first fragment was already added to queue by caller */ 873 874 while (rem) { 875 int fraglen = per_fragm; 876 877 if (fraglen > rem) 878 fraglen = rem; 879 rem -= fraglen; 880 tmp = dev_alloc_skb(local->tx_headroom + 881 frag_threshold + 882 tx->sdata->encrypt_headroom + 883 IEEE80211_ENCRYPT_TAILROOM); 884 if (!tmp) 885 return -ENOMEM; 886 887 __skb_queue_tail(&tx->skbs, tmp); 888 889 skb_reserve(tmp, 890 local->tx_headroom + tx->sdata->encrypt_headroom); 891 892 /* copy control information */ 893 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 894 895 info = IEEE80211_SKB_CB(tmp); 896 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 897 IEEE80211_TX_CTL_FIRST_FRAGMENT); 898 899 if (rem) 900 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 901 902 skb_copy_queue_mapping(tmp, skb); 903 tmp->priority = skb->priority; 904 tmp->dev = skb->dev; 905 906 /* copy header and data */ 907 skb_put_data(tmp, skb->data, hdrlen); 908 skb_put_data(tmp, skb->data + pos, fraglen); 909 910 pos += fraglen; 911 } 912 913 /* adjust first fragment's length */ 914 skb_trim(skb, hdrlen + per_fragm); 915 return 0; 916 } 917 918 static ieee80211_tx_result debug_noinline 919 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 920 { 921 struct sk_buff *skb = tx->skb; 922 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 923 struct ieee80211_hdr *hdr = (void *)skb->data; 924 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 925 int hdrlen; 926 int fragnum; 927 928 /* no matter what happens, tx->skb moves to tx->skbs */ 929 __skb_queue_tail(&tx->skbs, skb); 930 tx->skb = NULL; 931 932 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 933 return TX_CONTINUE; 934 935 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 936 return TX_CONTINUE; 937 938 /* 939 * Warn when submitting a fragmented A-MPDU frame and drop it. 940 * This scenario is handled in ieee80211_tx_prepare but extra 941 * caution taken here as fragmented ampdu may cause Tx stop. 942 */ 943 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 944 return TX_DROP; 945 946 hdrlen = ieee80211_hdrlen(hdr->frame_control); 947 948 /* internal error, why isn't DONTFRAG set? */ 949 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 950 return TX_DROP; 951 952 /* 953 * Now fragment the frame. This will allocate all the fragments and 954 * chain them (using skb as the first fragment) to skb->next. 955 * During transmission, we will remove the successfully transmitted 956 * fragments from this list. When the low-level driver rejects one 957 * of the fragments then we will simply pretend to accept the skb 958 * but store it away as pending. 959 */ 960 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 961 return TX_DROP; 962 963 /* update duration/seq/flags of fragments */ 964 fragnum = 0; 965 966 skb_queue_walk(&tx->skbs, skb) { 967 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 968 969 hdr = (void *)skb->data; 970 info = IEEE80211_SKB_CB(skb); 971 972 if (!skb_queue_is_last(&tx->skbs, skb)) { 973 hdr->frame_control |= morefrags; 974 /* 975 * No multi-rate retries for fragmented frames, that 976 * would completely throw off the NAV at other STAs. 977 */ 978 info->control.rates[1].idx = -1; 979 info->control.rates[2].idx = -1; 980 info->control.rates[3].idx = -1; 981 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 982 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 983 } else { 984 hdr->frame_control &= ~morefrags; 985 } 986 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 987 fragnum++; 988 } 989 990 return TX_CONTINUE; 991 } 992 993 static ieee80211_tx_result debug_noinline 994 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 995 { 996 struct sk_buff *skb; 997 int ac = -1; 998 999 if (!tx->sta) 1000 return TX_CONTINUE; 1001 1002 skb_queue_walk(&tx->skbs, skb) { 1003 ac = skb_get_queue_mapping(skb); 1004 tx->sta->tx_stats.bytes[ac] += skb->len; 1005 } 1006 if (ac >= 0) 1007 tx->sta->tx_stats.packets[ac]++; 1008 1009 return TX_CONTINUE; 1010 } 1011 1012 static ieee80211_tx_result debug_noinline 1013 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1014 { 1015 if (!tx->key) 1016 return TX_CONTINUE; 1017 1018 switch (tx->key->conf.cipher) { 1019 case WLAN_CIPHER_SUITE_WEP40: 1020 case WLAN_CIPHER_SUITE_WEP104: 1021 return ieee80211_crypto_wep_encrypt(tx); 1022 case WLAN_CIPHER_SUITE_TKIP: 1023 return ieee80211_crypto_tkip_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_CCMP: 1025 return ieee80211_crypto_ccmp_encrypt( 1026 tx, IEEE80211_CCMP_MIC_LEN); 1027 case WLAN_CIPHER_SUITE_CCMP_256: 1028 return ieee80211_crypto_ccmp_encrypt( 1029 tx, IEEE80211_CCMP_256_MIC_LEN); 1030 case WLAN_CIPHER_SUITE_AES_CMAC: 1031 return ieee80211_crypto_aes_cmac_encrypt(tx); 1032 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1033 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1035 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1036 return ieee80211_crypto_aes_gmac_encrypt(tx); 1037 case WLAN_CIPHER_SUITE_GCMP: 1038 case WLAN_CIPHER_SUITE_GCMP_256: 1039 return ieee80211_crypto_gcmp_encrypt(tx); 1040 default: 1041 return ieee80211_crypto_hw_encrypt(tx); 1042 } 1043 1044 return TX_DROP; 1045 } 1046 1047 static ieee80211_tx_result debug_noinline 1048 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1049 { 1050 struct sk_buff *skb; 1051 struct ieee80211_hdr *hdr; 1052 int next_len; 1053 bool group_addr; 1054 1055 skb_queue_walk(&tx->skbs, skb) { 1056 hdr = (void *) skb->data; 1057 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1058 break; /* must not overwrite AID */ 1059 if (!skb_queue_is_last(&tx->skbs, skb)) { 1060 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1061 next_len = next->len; 1062 } else 1063 next_len = 0; 1064 group_addr = is_multicast_ether_addr(hdr->addr1); 1065 1066 hdr->duration_id = 1067 ieee80211_duration(tx, skb, group_addr, next_len); 1068 } 1069 1070 return TX_CONTINUE; 1071 } 1072 1073 /* actual transmit path */ 1074 1075 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1076 struct sk_buff *skb, 1077 struct ieee80211_tx_info *info, 1078 struct tid_ampdu_tx *tid_tx, 1079 int tid) 1080 { 1081 bool queued = false; 1082 bool reset_agg_timer = false; 1083 struct sk_buff *purge_skb = NULL; 1084 1085 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1086 info->flags |= IEEE80211_TX_CTL_AMPDU; 1087 reset_agg_timer = true; 1088 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1089 /* 1090 * nothing -- this aggregation session is being started 1091 * but that might still fail with the driver 1092 */ 1093 } else if (!tx->sta->sta.txq[tid]) { 1094 spin_lock(&tx->sta->lock); 1095 /* 1096 * Need to re-check now, because we may get here 1097 * 1098 * 1) in the window during which the setup is actually 1099 * already done, but not marked yet because not all 1100 * packets are spliced over to the driver pending 1101 * queue yet -- if this happened we acquire the lock 1102 * either before or after the splice happens, but 1103 * need to recheck which of these cases happened. 1104 * 1105 * 2) during session teardown, if the OPERATIONAL bit 1106 * was cleared due to the teardown but the pointer 1107 * hasn't been assigned NULL yet (or we loaded it 1108 * before it was assigned) -- in this case it may 1109 * now be NULL which means we should just let the 1110 * packet pass through because splicing the frames 1111 * back is already done. 1112 */ 1113 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1114 1115 if (!tid_tx) { 1116 /* do nothing, let packet pass through */ 1117 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1118 info->flags |= IEEE80211_TX_CTL_AMPDU; 1119 reset_agg_timer = true; 1120 } else { 1121 queued = true; 1122 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1123 clear_sta_flag(tx->sta, WLAN_STA_SP); 1124 ps_dbg(tx->sta->sdata, 1125 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1126 tx->sta->sta.addr, tx->sta->sta.aid); 1127 } 1128 info->control.vif = &tx->sdata->vif; 1129 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1130 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1131 __skb_queue_tail(&tid_tx->pending, skb); 1132 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1133 purge_skb = __skb_dequeue(&tid_tx->pending); 1134 } 1135 spin_unlock(&tx->sta->lock); 1136 1137 if (purge_skb) 1138 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1139 } 1140 1141 /* reset session timer */ 1142 if (reset_agg_timer) 1143 tid_tx->last_tx = jiffies; 1144 1145 return queued; 1146 } 1147 1148 /* 1149 * initialises @tx 1150 * pass %NULL for the station if unknown, a valid pointer if known 1151 * or an ERR_PTR() if the station is known not to exist 1152 */ 1153 static ieee80211_tx_result 1154 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1155 struct ieee80211_tx_data *tx, 1156 struct sta_info *sta, struct sk_buff *skb) 1157 { 1158 struct ieee80211_local *local = sdata->local; 1159 struct ieee80211_hdr *hdr; 1160 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1161 int tid; 1162 1163 memset(tx, 0, sizeof(*tx)); 1164 tx->skb = skb; 1165 tx->local = local; 1166 tx->sdata = sdata; 1167 __skb_queue_head_init(&tx->skbs); 1168 1169 /* 1170 * If this flag is set to true anywhere, and we get here, 1171 * we are doing the needed processing, so remove the flag 1172 * now. 1173 */ 1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1175 1176 hdr = (struct ieee80211_hdr *) skb->data; 1177 1178 if (likely(sta)) { 1179 if (!IS_ERR(sta)) 1180 tx->sta = sta; 1181 } else { 1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1183 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1184 if (!tx->sta && sdata->wdev.use_4addr) 1185 return TX_DROP; 1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1187 IEEE80211_TX_CTL_INJECTED) || 1188 tx->sdata->control_port_protocol == tx->skb->protocol) { 1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1190 } 1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1192 tx->sta = sta_info_get(sdata, hdr->addr1); 1193 } 1194 1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1199 struct tid_ampdu_tx *tid_tx; 1200 1201 tid = ieee80211_get_tid(hdr); 1202 1203 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1204 if (tid_tx) { 1205 bool queued; 1206 1207 queued = ieee80211_tx_prep_agg(tx, skb, info, 1208 tid_tx, tid); 1209 1210 if (unlikely(queued)) 1211 return TX_QUEUED; 1212 } 1213 } 1214 1215 if (is_multicast_ether_addr(hdr->addr1)) { 1216 tx->flags &= ~IEEE80211_TX_UNICAST; 1217 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1218 } else 1219 tx->flags |= IEEE80211_TX_UNICAST; 1220 1221 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1222 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1223 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1224 info->flags & IEEE80211_TX_CTL_AMPDU) 1225 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1226 } 1227 1228 if (!tx->sta) 1229 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1230 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1231 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1232 ieee80211_check_fast_xmit(tx->sta); 1233 } 1234 1235 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1236 1237 return TX_CONTINUE; 1238 } 1239 1240 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1241 struct ieee80211_vif *vif, 1242 struct sta_info *sta, 1243 struct sk_buff *skb) 1244 { 1245 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1246 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1247 struct ieee80211_txq *txq = NULL; 1248 1249 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1250 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1251 return NULL; 1252 1253 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1254 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1255 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1256 vif->type == NL80211_IFTYPE_STATION) && 1257 sta && sta->uploaded) { 1258 /* 1259 * This will be NULL if the driver didn't set the 1260 * opt-in hardware flag. 1261 */ 1262 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1263 } 1264 } else if (sta) { 1265 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1266 1267 if (!sta->uploaded) 1268 return NULL; 1269 1270 txq = sta->sta.txq[tid]; 1271 } else if (vif) { 1272 txq = vif->txq; 1273 } 1274 1275 if (!txq) 1276 return NULL; 1277 1278 return to_txq_info(txq); 1279 } 1280 1281 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1282 { 1283 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1284 } 1285 1286 static u32 codel_skb_len_func(const struct sk_buff *skb) 1287 { 1288 return skb->len; 1289 } 1290 1291 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1292 { 1293 const struct ieee80211_tx_info *info; 1294 1295 info = (const struct ieee80211_tx_info *)skb->cb; 1296 return info->control.enqueue_time; 1297 } 1298 1299 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1300 void *ctx) 1301 { 1302 struct ieee80211_local *local; 1303 struct txq_info *txqi; 1304 struct fq *fq; 1305 struct fq_flow *flow; 1306 1307 txqi = ctx; 1308 local = vif_to_sdata(txqi->txq.vif)->local; 1309 fq = &local->fq; 1310 1311 if (cvars == &txqi->def_cvars) 1312 flow = &txqi->def_flow; 1313 else 1314 flow = &fq->flows[cvars - local->cvars]; 1315 1316 return fq_flow_dequeue(fq, flow); 1317 } 1318 1319 static void codel_drop_func(struct sk_buff *skb, 1320 void *ctx) 1321 { 1322 struct ieee80211_local *local; 1323 struct ieee80211_hw *hw; 1324 struct txq_info *txqi; 1325 1326 txqi = ctx; 1327 local = vif_to_sdata(txqi->txq.vif)->local; 1328 hw = &local->hw; 1329 1330 ieee80211_free_txskb(hw, skb); 1331 } 1332 1333 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1334 struct fq_tin *tin, 1335 struct fq_flow *flow) 1336 { 1337 struct ieee80211_local *local; 1338 struct txq_info *txqi; 1339 struct codel_vars *cvars; 1340 struct codel_params *cparams; 1341 struct codel_stats *cstats; 1342 1343 local = container_of(fq, struct ieee80211_local, fq); 1344 txqi = container_of(tin, struct txq_info, tin); 1345 cstats = &txqi->cstats; 1346 1347 if (txqi->txq.sta) { 1348 struct sta_info *sta = container_of(txqi->txq.sta, 1349 struct sta_info, sta); 1350 cparams = &sta->cparams; 1351 } else { 1352 cparams = &local->cparams; 1353 } 1354 1355 if (flow == &txqi->def_flow) 1356 cvars = &txqi->def_cvars; 1357 else 1358 cvars = &local->cvars[flow - fq->flows]; 1359 1360 return codel_dequeue(txqi, 1361 &flow->backlog, 1362 cparams, 1363 cvars, 1364 cstats, 1365 codel_skb_len_func, 1366 codel_skb_time_func, 1367 codel_drop_func, 1368 codel_dequeue_func); 1369 } 1370 1371 static void fq_skb_free_func(struct fq *fq, 1372 struct fq_tin *tin, 1373 struct fq_flow *flow, 1374 struct sk_buff *skb) 1375 { 1376 struct ieee80211_local *local; 1377 1378 local = container_of(fq, struct ieee80211_local, fq); 1379 ieee80211_free_txskb(&local->hw, skb); 1380 } 1381 1382 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1383 struct fq_tin *tin, 1384 int idx, 1385 struct sk_buff *skb) 1386 { 1387 struct txq_info *txqi; 1388 1389 txqi = container_of(tin, struct txq_info, tin); 1390 return &txqi->def_flow; 1391 } 1392 1393 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1394 struct txq_info *txqi, 1395 struct sk_buff *skb) 1396 { 1397 struct fq *fq = &local->fq; 1398 struct fq_tin *tin = &txqi->tin; 1399 u32 flow_idx = fq_flow_idx(fq, skb); 1400 1401 ieee80211_set_skb_enqueue_time(skb); 1402 1403 spin_lock_bh(&fq->lock); 1404 fq_tin_enqueue(fq, tin, flow_idx, skb, 1405 fq_skb_free_func, 1406 fq_flow_get_default_func); 1407 spin_unlock_bh(&fq->lock); 1408 } 1409 1410 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1411 struct fq_flow *flow, struct sk_buff *skb, 1412 void *data) 1413 { 1414 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1415 1416 return info->control.vif == data; 1417 } 1418 1419 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1420 struct ieee80211_sub_if_data *sdata) 1421 { 1422 struct fq *fq = &local->fq; 1423 struct txq_info *txqi; 1424 struct fq_tin *tin; 1425 struct ieee80211_sub_if_data *ap; 1426 1427 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1428 return; 1429 1430 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1431 1432 if (!ap->vif.txq) 1433 return; 1434 1435 txqi = to_txq_info(ap->vif.txq); 1436 tin = &txqi->tin; 1437 1438 spin_lock_bh(&fq->lock); 1439 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1440 fq_skb_free_func); 1441 spin_unlock_bh(&fq->lock); 1442 } 1443 1444 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1445 struct sta_info *sta, 1446 struct txq_info *txqi, int tid) 1447 { 1448 fq_tin_init(&txqi->tin); 1449 fq_flow_init(&txqi->def_flow); 1450 codel_vars_init(&txqi->def_cvars); 1451 codel_stats_init(&txqi->cstats); 1452 __skb_queue_head_init(&txqi->frags); 1453 INIT_LIST_HEAD(&txqi->schedule_order); 1454 1455 txqi->txq.vif = &sdata->vif; 1456 1457 if (!sta) { 1458 sdata->vif.txq = &txqi->txq; 1459 txqi->txq.tid = 0; 1460 txqi->txq.ac = IEEE80211_AC_BE; 1461 1462 return; 1463 } 1464 1465 if (tid == IEEE80211_NUM_TIDS) { 1466 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1467 /* Drivers need to opt in to the management MPDU TXQ */ 1468 if (!ieee80211_hw_check(&sdata->local->hw, 1469 STA_MMPDU_TXQ)) 1470 return; 1471 } else if (!ieee80211_hw_check(&sdata->local->hw, 1472 BUFF_MMPDU_TXQ)) { 1473 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1474 return; 1475 } 1476 txqi->txq.ac = IEEE80211_AC_VO; 1477 } else { 1478 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1479 } 1480 1481 txqi->txq.sta = &sta->sta; 1482 txqi->txq.tid = tid; 1483 sta->sta.txq[tid] = &txqi->txq; 1484 } 1485 1486 void ieee80211_txq_purge(struct ieee80211_local *local, 1487 struct txq_info *txqi) 1488 { 1489 struct fq *fq = &local->fq; 1490 struct fq_tin *tin = &txqi->tin; 1491 1492 spin_lock_bh(&fq->lock); 1493 fq_tin_reset(fq, tin, fq_skb_free_func); 1494 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1495 spin_unlock_bh(&fq->lock); 1496 1497 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1498 list_del_init(&txqi->schedule_order); 1499 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1500 } 1501 1502 void ieee80211_txq_set_params(struct ieee80211_local *local) 1503 { 1504 if (local->hw.wiphy->txq_limit) 1505 local->fq.limit = local->hw.wiphy->txq_limit; 1506 else 1507 local->hw.wiphy->txq_limit = local->fq.limit; 1508 1509 if (local->hw.wiphy->txq_memory_limit) 1510 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1511 else 1512 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1513 1514 if (local->hw.wiphy->txq_quantum) 1515 local->fq.quantum = local->hw.wiphy->txq_quantum; 1516 else 1517 local->hw.wiphy->txq_quantum = local->fq.quantum; 1518 } 1519 1520 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1521 { 1522 struct fq *fq = &local->fq; 1523 int ret; 1524 int i; 1525 bool supp_vht = false; 1526 enum nl80211_band band; 1527 1528 if (!local->ops->wake_tx_queue) 1529 return 0; 1530 1531 ret = fq_init(fq, 4096); 1532 if (ret) 1533 return ret; 1534 1535 /* 1536 * If the hardware doesn't support VHT, it is safe to limit the maximum 1537 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1538 */ 1539 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1540 struct ieee80211_supported_band *sband; 1541 1542 sband = local->hw.wiphy->bands[band]; 1543 if (!sband) 1544 continue; 1545 1546 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1547 } 1548 1549 if (!supp_vht) 1550 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1551 1552 codel_params_init(&local->cparams); 1553 local->cparams.interval = MS2TIME(100); 1554 local->cparams.target = MS2TIME(20); 1555 local->cparams.ecn = true; 1556 1557 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1558 GFP_KERNEL); 1559 if (!local->cvars) { 1560 spin_lock_bh(&fq->lock); 1561 fq_reset(fq, fq_skb_free_func); 1562 spin_unlock_bh(&fq->lock); 1563 return -ENOMEM; 1564 } 1565 1566 for (i = 0; i < fq->flows_cnt; i++) 1567 codel_vars_init(&local->cvars[i]); 1568 1569 ieee80211_txq_set_params(local); 1570 1571 return 0; 1572 } 1573 1574 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1575 { 1576 struct fq *fq = &local->fq; 1577 1578 if (!local->ops->wake_tx_queue) 1579 return; 1580 1581 kfree(local->cvars); 1582 local->cvars = NULL; 1583 1584 spin_lock_bh(&fq->lock); 1585 fq_reset(fq, fq_skb_free_func); 1586 spin_unlock_bh(&fq->lock); 1587 } 1588 1589 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1590 struct ieee80211_sub_if_data *sdata, 1591 struct sta_info *sta, 1592 struct sk_buff *skb) 1593 { 1594 struct ieee80211_vif *vif; 1595 struct txq_info *txqi; 1596 1597 if (!local->ops->wake_tx_queue || 1598 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1599 return false; 1600 1601 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1602 sdata = container_of(sdata->bss, 1603 struct ieee80211_sub_if_data, u.ap); 1604 1605 vif = &sdata->vif; 1606 txqi = ieee80211_get_txq(local, vif, sta, skb); 1607 1608 if (!txqi) 1609 return false; 1610 1611 ieee80211_txq_enqueue(local, txqi, skb); 1612 1613 schedule_and_wake_txq(local, txqi); 1614 1615 return true; 1616 } 1617 1618 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1619 struct ieee80211_vif *vif, 1620 struct sta_info *sta, 1621 struct sk_buff_head *skbs, 1622 bool txpending) 1623 { 1624 struct ieee80211_tx_control control = {}; 1625 struct sk_buff *skb, *tmp; 1626 unsigned long flags; 1627 1628 skb_queue_walk_safe(skbs, skb, tmp) { 1629 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1630 int q = info->hw_queue; 1631 1632 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1633 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1634 __skb_unlink(skb, skbs); 1635 ieee80211_free_txskb(&local->hw, skb); 1636 continue; 1637 } 1638 #endif 1639 1640 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1641 if (local->queue_stop_reasons[q] || 1642 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1643 if (unlikely(info->flags & 1644 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1645 if (local->queue_stop_reasons[q] & 1646 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1647 /* 1648 * Drop off-channel frames if queues 1649 * are stopped for any reason other 1650 * than off-channel operation. Never 1651 * queue them. 1652 */ 1653 spin_unlock_irqrestore( 1654 &local->queue_stop_reason_lock, 1655 flags); 1656 ieee80211_purge_tx_queue(&local->hw, 1657 skbs); 1658 return true; 1659 } 1660 } else { 1661 1662 /* 1663 * Since queue is stopped, queue up frames for 1664 * later transmission from the tx-pending 1665 * tasklet when the queue is woken again. 1666 */ 1667 if (txpending) 1668 skb_queue_splice_init(skbs, 1669 &local->pending[q]); 1670 else 1671 skb_queue_splice_tail_init(skbs, 1672 &local->pending[q]); 1673 1674 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1675 flags); 1676 return false; 1677 } 1678 } 1679 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1680 1681 info->control.vif = vif; 1682 control.sta = sta ? &sta->sta : NULL; 1683 1684 __skb_unlink(skb, skbs); 1685 drv_tx(local, &control, skb); 1686 } 1687 1688 return true; 1689 } 1690 1691 /* 1692 * Returns false if the frame couldn't be transmitted but was queued instead. 1693 */ 1694 static bool __ieee80211_tx(struct ieee80211_local *local, 1695 struct sk_buff_head *skbs, int led_len, 1696 struct sta_info *sta, bool txpending) 1697 { 1698 struct ieee80211_tx_info *info; 1699 struct ieee80211_sub_if_data *sdata; 1700 struct ieee80211_vif *vif; 1701 struct sk_buff *skb; 1702 bool result = true; 1703 __le16 fc; 1704 1705 if (WARN_ON(skb_queue_empty(skbs))) 1706 return true; 1707 1708 skb = skb_peek(skbs); 1709 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1710 info = IEEE80211_SKB_CB(skb); 1711 sdata = vif_to_sdata(info->control.vif); 1712 if (sta && !sta->uploaded) 1713 sta = NULL; 1714 1715 switch (sdata->vif.type) { 1716 case NL80211_IFTYPE_MONITOR: 1717 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1718 vif = &sdata->vif; 1719 break; 1720 } 1721 sdata = rcu_dereference(local->monitor_sdata); 1722 if (sdata) { 1723 vif = &sdata->vif; 1724 info->hw_queue = 1725 vif->hw_queue[skb_get_queue_mapping(skb)]; 1726 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1727 ieee80211_purge_tx_queue(&local->hw, skbs); 1728 return true; 1729 } else 1730 vif = NULL; 1731 break; 1732 case NL80211_IFTYPE_AP_VLAN: 1733 sdata = container_of(sdata->bss, 1734 struct ieee80211_sub_if_data, u.ap); 1735 /* fall through */ 1736 default: 1737 vif = &sdata->vif; 1738 break; 1739 } 1740 1741 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1742 1743 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1744 1745 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1746 1747 return result; 1748 } 1749 1750 /* 1751 * Invoke TX handlers, return 0 on success and non-zero if the 1752 * frame was dropped or queued. 1753 * 1754 * The handlers are split into an early and late part. The latter is everything 1755 * that can be sensitive to reordering, and will be deferred to after packets 1756 * are dequeued from the intermediate queues (when they are enabled). 1757 */ 1758 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1759 { 1760 ieee80211_tx_result res = TX_DROP; 1761 1762 #define CALL_TXH(txh) \ 1763 do { \ 1764 res = txh(tx); \ 1765 if (res != TX_CONTINUE) \ 1766 goto txh_done; \ 1767 } while (0) 1768 1769 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1770 CALL_TXH(ieee80211_tx_h_check_assoc); 1771 CALL_TXH(ieee80211_tx_h_ps_buf); 1772 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1773 CALL_TXH(ieee80211_tx_h_select_key); 1774 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1775 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1776 1777 txh_done: 1778 if (unlikely(res == TX_DROP)) { 1779 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1780 if (tx->skb) 1781 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1782 else 1783 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1784 return -1; 1785 } else if (unlikely(res == TX_QUEUED)) { 1786 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1787 return -1; 1788 } 1789 1790 return 0; 1791 } 1792 1793 /* 1794 * Late handlers can be called while the sta lock is held. Handlers that can 1795 * cause packets to be generated will cause deadlock! 1796 */ 1797 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1798 { 1799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1800 ieee80211_tx_result res = TX_CONTINUE; 1801 1802 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1803 __skb_queue_tail(&tx->skbs, tx->skb); 1804 tx->skb = NULL; 1805 goto txh_done; 1806 } 1807 1808 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1809 CALL_TXH(ieee80211_tx_h_sequence); 1810 CALL_TXH(ieee80211_tx_h_fragment); 1811 /* handlers after fragment must be aware of tx info fragmentation! */ 1812 CALL_TXH(ieee80211_tx_h_stats); 1813 CALL_TXH(ieee80211_tx_h_encrypt); 1814 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1815 CALL_TXH(ieee80211_tx_h_calculate_duration); 1816 #undef CALL_TXH 1817 1818 txh_done: 1819 if (unlikely(res == TX_DROP)) { 1820 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1821 if (tx->skb) 1822 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1823 else 1824 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1825 return -1; 1826 } else if (unlikely(res == TX_QUEUED)) { 1827 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1828 return -1; 1829 } 1830 1831 return 0; 1832 } 1833 1834 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1835 { 1836 int r = invoke_tx_handlers_early(tx); 1837 1838 if (r) 1839 return r; 1840 return invoke_tx_handlers_late(tx); 1841 } 1842 1843 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1844 struct ieee80211_vif *vif, struct sk_buff *skb, 1845 int band, struct ieee80211_sta **sta) 1846 { 1847 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1848 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1849 struct ieee80211_tx_data tx; 1850 struct sk_buff *skb2; 1851 1852 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1853 return false; 1854 1855 info->band = band; 1856 info->control.vif = vif; 1857 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1858 1859 if (invoke_tx_handlers(&tx)) 1860 return false; 1861 1862 if (sta) { 1863 if (tx.sta) 1864 *sta = &tx.sta->sta; 1865 else 1866 *sta = NULL; 1867 } 1868 1869 /* this function isn't suitable for fragmented data frames */ 1870 skb2 = __skb_dequeue(&tx.skbs); 1871 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1872 ieee80211_free_txskb(hw, skb2); 1873 ieee80211_purge_tx_queue(hw, &tx.skbs); 1874 return false; 1875 } 1876 1877 return true; 1878 } 1879 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1880 1881 /* 1882 * Returns false if the frame couldn't be transmitted but was queued instead. 1883 */ 1884 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1885 struct sta_info *sta, struct sk_buff *skb, 1886 bool txpending, u32 txdata_flags) 1887 { 1888 struct ieee80211_local *local = sdata->local; 1889 struct ieee80211_tx_data tx; 1890 ieee80211_tx_result res_prepare; 1891 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1892 bool result = true; 1893 int led_len; 1894 1895 if (unlikely(skb->len < 10)) { 1896 dev_kfree_skb(skb); 1897 return true; 1898 } 1899 1900 /* initialises tx */ 1901 led_len = skb->len; 1902 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1903 1904 tx.flags |= txdata_flags; 1905 1906 if (unlikely(res_prepare == TX_DROP)) { 1907 ieee80211_free_txskb(&local->hw, skb); 1908 return true; 1909 } else if (unlikely(res_prepare == TX_QUEUED)) { 1910 return true; 1911 } 1912 1913 /* set up hw_queue value early */ 1914 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1915 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1916 info->hw_queue = 1917 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1918 1919 if (invoke_tx_handlers_early(&tx)) 1920 return true; 1921 1922 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1923 return true; 1924 1925 if (!invoke_tx_handlers_late(&tx)) 1926 result = __ieee80211_tx(local, &tx.skbs, led_len, 1927 tx.sta, txpending); 1928 1929 return result; 1930 } 1931 1932 /* device xmit handlers */ 1933 1934 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1935 struct sk_buff *skb, 1936 int head_need, bool may_encrypt) 1937 { 1938 struct ieee80211_local *local = sdata->local; 1939 struct ieee80211_hdr *hdr; 1940 bool enc_tailroom; 1941 int tail_need = 0; 1942 1943 hdr = (struct ieee80211_hdr *) skb->data; 1944 enc_tailroom = may_encrypt && 1945 (sdata->crypto_tx_tailroom_needed_cnt || 1946 ieee80211_is_mgmt(hdr->frame_control)); 1947 1948 if (enc_tailroom) { 1949 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1950 tail_need -= skb_tailroom(skb); 1951 tail_need = max_t(int, tail_need, 0); 1952 } 1953 1954 if (skb_cloned(skb) && 1955 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1956 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1957 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1958 else if (head_need || tail_need) 1959 I802_DEBUG_INC(local->tx_expand_skb_head); 1960 else 1961 return 0; 1962 1963 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1964 wiphy_debug(local->hw.wiphy, 1965 "failed to reallocate TX buffer\n"); 1966 return -ENOMEM; 1967 } 1968 1969 return 0; 1970 } 1971 1972 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1973 struct sta_info *sta, struct sk_buff *skb, 1974 u32 txdata_flags) 1975 { 1976 struct ieee80211_local *local = sdata->local; 1977 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1978 struct ieee80211_hdr *hdr; 1979 int headroom; 1980 bool may_encrypt; 1981 1982 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1983 1984 headroom = local->tx_headroom; 1985 if (may_encrypt) 1986 headroom += sdata->encrypt_headroom; 1987 headroom -= skb_headroom(skb); 1988 headroom = max_t(int, 0, headroom); 1989 1990 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1991 ieee80211_free_txskb(&local->hw, skb); 1992 return; 1993 } 1994 1995 hdr = (struct ieee80211_hdr *) skb->data; 1996 info->control.vif = &sdata->vif; 1997 1998 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1999 if (ieee80211_is_data(hdr->frame_control) && 2000 is_unicast_ether_addr(hdr->addr1)) { 2001 if (mesh_nexthop_resolve(sdata, skb)) 2002 return; /* skb queued: don't free */ 2003 } else { 2004 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2005 } 2006 } 2007 2008 ieee80211_set_qos_hdr(sdata, skb); 2009 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 2010 } 2011 2012 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 2013 struct sk_buff *skb) 2014 { 2015 struct ieee80211_radiotap_iterator iterator; 2016 struct ieee80211_radiotap_header *rthdr = 2017 (struct ieee80211_radiotap_header *) skb->data; 2018 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2019 struct ieee80211_supported_band *sband = 2020 local->hw.wiphy->bands[info->band]; 2021 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2022 NULL); 2023 u16 txflags; 2024 u16 rate = 0; 2025 bool rate_found = false; 2026 u8 rate_retries = 0; 2027 u16 rate_flags = 0; 2028 u8 mcs_known, mcs_flags, mcs_bw; 2029 u16 vht_known; 2030 u8 vht_mcs = 0, vht_nss = 0; 2031 int i; 2032 2033 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2034 IEEE80211_TX_CTL_DONTFRAG; 2035 2036 /* 2037 * for every radiotap entry that is present 2038 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2039 * entries present, or -EINVAL on error) 2040 */ 2041 2042 while (!ret) { 2043 ret = ieee80211_radiotap_iterator_next(&iterator); 2044 2045 if (ret) 2046 continue; 2047 2048 /* see if this argument is something we can use */ 2049 switch (iterator.this_arg_index) { 2050 /* 2051 * You must take care when dereferencing iterator.this_arg 2052 * for multibyte types... the pointer is not aligned. Use 2053 * get_unaligned((type *)iterator.this_arg) to dereference 2054 * iterator.this_arg for type "type" safely on all arches. 2055 */ 2056 case IEEE80211_RADIOTAP_FLAGS: 2057 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2058 /* 2059 * this indicates that the skb we have been 2060 * handed has the 32-bit FCS CRC at the end... 2061 * we should react to that by snipping it off 2062 * because it will be recomputed and added 2063 * on transmission 2064 */ 2065 if (skb->len < (iterator._max_length + FCS_LEN)) 2066 return false; 2067 2068 skb_trim(skb, skb->len - FCS_LEN); 2069 } 2070 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2071 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2072 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2073 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2074 break; 2075 2076 case IEEE80211_RADIOTAP_TX_FLAGS: 2077 txflags = get_unaligned_le16(iterator.this_arg); 2078 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2079 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2080 break; 2081 2082 case IEEE80211_RADIOTAP_RATE: 2083 rate = *iterator.this_arg; 2084 rate_flags = 0; 2085 rate_found = true; 2086 break; 2087 2088 case IEEE80211_RADIOTAP_DATA_RETRIES: 2089 rate_retries = *iterator.this_arg; 2090 break; 2091 2092 case IEEE80211_RADIOTAP_MCS: 2093 mcs_known = iterator.this_arg[0]; 2094 mcs_flags = iterator.this_arg[1]; 2095 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2096 break; 2097 2098 rate_found = true; 2099 rate = iterator.this_arg[2]; 2100 rate_flags = IEEE80211_TX_RC_MCS; 2101 2102 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2103 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2104 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2105 2106 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2107 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2108 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2109 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2110 break; 2111 2112 case IEEE80211_RADIOTAP_VHT: 2113 vht_known = get_unaligned_le16(iterator.this_arg); 2114 rate_found = true; 2115 2116 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2117 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2118 (iterator.this_arg[2] & 2119 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2120 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2121 if (vht_known & 2122 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2123 if (iterator.this_arg[3] == 1) 2124 rate_flags |= 2125 IEEE80211_TX_RC_40_MHZ_WIDTH; 2126 else if (iterator.this_arg[3] == 4) 2127 rate_flags |= 2128 IEEE80211_TX_RC_80_MHZ_WIDTH; 2129 else if (iterator.this_arg[3] == 11) 2130 rate_flags |= 2131 IEEE80211_TX_RC_160_MHZ_WIDTH; 2132 } 2133 2134 vht_mcs = iterator.this_arg[4] >> 4; 2135 vht_nss = iterator.this_arg[4] & 0xF; 2136 break; 2137 2138 /* 2139 * Please update the file 2140 * Documentation/networking/mac80211-injection.txt 2141 * when parsing new fields here. 2142 */ 2143 2144 default: 2145 break; 2146 } 2147 } 2148 2149 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2150 return false; 2151 2152 if (rate_found) { 2153 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2154 2155 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2156 info->control.rates[i].idx = -1; 2157 info->control.rates[i].flags = 0; 2158 info->control.rates[i].count = 0; 2159 } 2160 2161 if (rate_flags & IEEE80211_TX_RC_MCS) { 2162 info->control.rates[0].idx = rate; 2163 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2164 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2165 vht_nss); 2166 } else { 2167 for (i = 0; i < sband->n_bitrates; i++) { 2168 if (rate * 5 != sband->bitrates[i].bitrate) 2169 continue; 2170 2171 info->control.rates[0].idx = i; 2172 break; 2173 } 2174 } 2175 2176 if (info->control.rates[0].idx < 0) 2177 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2178 2179 info->control.rates[0].flags = rate_flags; 2180 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2181 local->hw.max_rate_tries); 2182 } 2183 2184 /* 2185 * remove the radiotap header 2186 * iterator->_max_length was sanity-checked against 2187 * skb->len by iterator init 2188 */ 2189 skb_pull(skb, iterator._max_length); 2190 2191 return true; 2192 } 2193 2194 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2195 struct net_device *dev) 2196 { 2197 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2198 struct ieee80211_chanctx_conf *chanctx_conf; 2199 struct ieee80211_radiotap_header *prthdr = 2200 (struct ieee80211_radiotap_header *)skb->data; 2201 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2202 struct ieee80211_hdr *hdr; 2203 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2204 struct cfg80211_chan_def *chandef; 2205 u16 len_rthdr; 2206 int hdrlen; 2207 2208 /* check for not even having the fixed radiotap header part */ 2209 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2210 goto fail; /* too short to be possibly valid */ 2211 2212 /* is it a header version we can trust to find length from? */ 2213 if (unlikely(prthdr->it_version)) 2214 goto fail; /* only version 0 is supported */ 2215 2216 /* then there must be a radiotap header with a length we can use */ 2217 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2218 2219 /* does the skb contain enough to deliver on the alleged length? */ 2220 if (unlikely(skb->len < len_rthdr)) 2221 goto fail; /* skb too short for claimed rt header extent */ 2222 2223 /* 2224 * fix up the pointers accounting for the radiotap 2225 * header still being in there. We are being given 2226 * a precooked IEEE80211 header so no need for 2227 * normal processing 2228 */ 2229 skb_set_mac_header(skb, len_rthdr); 2230 /* 2231 * these are just fixed to the end of the rt area since we 2232 * don't have any better information and at this point, nobody cares 2233 */ 2234 skb_set_network_header(skb, len_rthdr); 2235 skb_set_transport_header(skb, len_rthdr); 2236 2237 if (skb->len < len_rthdr + 2) 2238 goto fail; 2239 2240 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2241 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2242 2243 if (skb->len < len_rthdr + hdrlen) 2244 goto fail; 2245 2246 /* 2247 * Initialize skb->protocol if the injected frame is a data frame 2248 * carrying a rfc1042 header 2249 */ 2250 if (ieee80211_is_data(hdr->frame_control) && 2251 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2252 u8 *payload = (u8 *)hdr + hdrlen; 2253 2254 if (ether_addr_equal(payload, rfc1042_header)) 2255 skb->protocol = cpu_to_be16((payload[6] << 8) | 2256 payload[7]); 2257 } 2258 2259 memset(info, 0, sizeof(*info)); 2260 2261 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2262 IEEE80211_TX_CTL_INJECTED; 2263 2264 rcu_read_lock(); 2265 2266 /* 2267 * We process outgoing injected frames that have a local address 2268 * we handle as though they are non-injected frames. 2269 * This code here isn't entirely correct, the local MAC address 2270 * isn't always enough to find the interface to use; for proper 2271 * VLAN/WDS support we will need a different mechanism (which 2272 * likely isn't going to be monitor interfaces). 2273 * 2274 * This is necessary, for example, for old hostapd versions that 2275 * don't use nl80211-based management TX/RX. 2276 */ 2277 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2278 2279 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2280 if (!ieee80211_sdata_running(tmp_sdata)) 2281 continue; 2282 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2283 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2284 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2285 continue; 2286 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2287 sdata = tmp_sdata; 2288 break; 2289 } 2290 } 2291 2292 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2293 if (!chanctx_conf) { 2294 tmp_sdata = rcu_dereference(local->monitor_sdata); 2295 if (tmp_sdata) 2296 chanctx_conf = 2297 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2298 } 2299 2300 if (chanctx_conf) 2301 chandef = &chanctx_conf->def; 2302 else if (!local->use_chanctx) 2303 chandef = &local->_oper_chandef; 2304 else 2305 goto fail_rcu; 2306 2307 /* 2308 * Frame injection is not allowed if beaconing is not allowed 2309 * or if we need radar detection. Beaconing is usually not allowed when 2310 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2311 * Passive scan is also used in world regulatory domains where 2312 * your country is not known and as such it should be treated as 2313 * NO TX unless the channel is explicitly allowed in which case 2314 * your current regulatory domain would not have the passive scan 2315 * flag. 2316 * 2317 * Since AP mode uses monitor interfaces to inject/TX management 2318 * frames we can make AP mode the exception to this rule once it 2319 * supports radar detection as its implementation can deal with 2320 * radar detection by itself. We can do that later by adding a 2321 * monitor flag interfaces used for AP support. 2322 */ 2323 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2324 sdata->vif.type)) 2325 goto fail_rcu; 2326 2327 info->band = chandef->chan->band; 2328 2329 /* process and remove the injection radiotap header */ 2330 if (!ieee80211_parse_tx_radiotap(local, skb)) 2331 goto fail_rcu; 2332 2333 ieee80211_xmit(sdata, NULL, skb, 0); 2334 rcu_read_unlock(); 2335 2336 return NETDEV_TX_OK; 2337 2338 fail_rcu: 2339 rcu_read_unlock(); 2340 fail: 2341 dev_kfree_skb(skb); 2342 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2343 } 2344 2345 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2346 { 2347 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2348 2349 return ethertype == ETH_P_TDLS && 2350 skb->len > 14 && 2351 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2352 } 2353 2354 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2355 struct sk_buff *skb, 2356 struct sta_info **sta_out) 2357 { 2358 struct sta_info *sta; 2359 2360 switch (sdata->vif.type) { 2361 case NL80211_IFTYPE_AP_VLAN: 2362 sta = rcu_dereference(sdata->u.vlan.sta); 2363 if (sta) { 2364 *sta_out = sta; 2365 return 0; 2366 } else if (sdata->wdev.use_4addr) { 2367 return -ENOLINK; 2368 } 2369 /* fall through */ 2370 case NL80211_IFTYPE_AP: 2371 case NL80211_IFTYPE_OCB: 2372 case NL80211_IFTYPE_ADHOC: 2373 if (is_multicast_ether_addr(skb->data)) { 2374 *sta_out = ERR_PTR(-ENOENT); 2375 return 0; 2376 } 2377 sta = sta_info_get_bss(sdata, skb->data); 2378 break; 2379 case NL80211_IFTYPE_WDS: 2380 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2381 break; 2382 #ifdef CONFIG_MAC80211_MESH 2383 case NL80211_IFTYPE_MESH_POINT: 2384 /* determined much later */ 2385 *sta_out = NULL; 2386 return 0; 2387 #endif 2388 case NL80211_IFTYPE_STATION: 2389 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2390 sta = sta_info_get(sdata, skb->data); 2391 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2392 if (test_sta_flag(sta, 2393 WLAN_STA_TDLS_PEER_AUTH)) { 2394 *sta_out = sta; 2395 return 0; 2396 } 2397 2398 /* 2399 * TDLS link during setup - throw out frames to 2400 * peer. Allow TDLS-setup frames to unauthorized 2401 * peers for the special case of a link teardown 2402 * after a TDLS sta is removed due to being 2403 * unreachable. 2404 */ 2405 if (!ieee80211_is_tdls_setup(skb)) 2406 return -EINVAL; 2407 } 2408 2409 } 2410 2411 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2412 if (!sta) 2413 return -ENOLINK; 2414 break; 2415 default: 2416 return -EINVAL; 2417 } 2418 2419 *sta_out = sta ?: ERR_PTR(-ENOENT); 2420 return 0; 2421 } 2422 2423 static int ieee80211_store_ack_skb(struct ieee80211_local *local, 2424 struct sk_buff *skb, 2425 u32 *info_flags) 2426 { 2427 struct sk_buff *ack_skb = skb_clone_sk(skb); 2428 u16 info_id = 0; 2429 2430 if (ack_skb) { 2431 unsigned long flags; 2432 int id; 2433 2434 spin_lock_irqsave(&local->ack_status_lock, flags); 2435 id = idr_alloc(&local->ack_status_frames, ack_skb, 2436 1, 0x40, GFP_ATOMIC); 2437 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2438 2439 if (id >= 0) { 2440 info_id = id; 2441 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2442 } else { 2443 kfree_skb(ack_skb); 2444 } 2445 } 2446 2447 return info_id; 2448 } 2449 2450 /** 2451 * ieee80211_build_hdr - build 802.11 header in the given frame 2452 * @sdata: virtual interface to build the header for 2453 * @skb: the skb to build the header in 2454 * @info_flags: skb flags to set 2455 * @ctrl_flags: info control flags to set 2456 * 2457 * This function takes the skb with 802.3 header and reformats the header to 2458 * the appropriate IEEE 802.11 header based on which interface the packet is 2459 * being transmitted on. 2460 * 2461 * Note that this function also takes care of the TX status request and 2462 * potential unsharing of the SKB - this needs to be interleaved with the 2463 * header building. 2464 * 2465 * The function requires the read-side RCU lock held 2466 * 2467 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2468 */ 2469 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2470 struct sk_buff *skb, u32 info_flags, 2471 struct sta_info *sta, u32 ctrl_flags) 2472 { 2473 struct ieee80211_local *local = sdata->local; 2474 struct ieee80211_tx_info *info; 2475 int head_need; 2476 u16 ethertype, hdrlen, meshhdrlen = 0; 2477 __le16 fc; 2478 struct ieee80211_hdr hdr; 2479 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2480 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2481 const u8 *encaps_data; 2482 int encaps_len, skip_header_bytes; 2483 bool wme_sta = false, authorized = false; 2484 bool tdls_peer; 2485 bool multicast; 2486 u16 info_id = 0; 2487 struct ieee80211_chanctx_conf *chanctx_conf; 2488 struct ieee80211_sub_if_data *ap_sdata; 2489 enum nl80211_band band; 2490 int ret; 2491 2492 if (IS_ERR(sta)) 2493 sta = NULL; 2494 2495 #ifdef CONFIG_MAC80211_DEBUGFS 2496 if (local->force_tx_status) 2497 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2498 #endif 2499 2500 /* convert Ethernet header to proper 802.11 header (based on 2501 * operation mode) */ 2502 ethertype = (skb->data[12] << 8) | skb->data[13]; 2503 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2504 2505 switch (sdata->vif.type) { 2506 case NL80211_IFTYPE_AP_VLAN: 2507 if (sdata->wdev.use_4addr) { 2508 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2509 /* RA TA DA SA */ 2510 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2511 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2512 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2513 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2514 hdrlen = 30; 2515 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2516 wme_sta = sta->sta.wme; 2517 } 2518 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2519 u.ap); 2520 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2521 if (!chanctx_conf) { 2522 ret = -ENOTCONN; 2523 goto free; 2524 } 2525 band = chanctx_conf->def.chan->band; 2526 if (sdata->wdev.use_4addr) 2527 break; 2528 /* fall through */ 2529 case NL80211_IFTYPE_AP: 2530 if (sdata->vif.type == NL80211_IFTYPE_AP) 2531 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2532 if (!chanctx_conf) { 2533 ret = -ENOTCONN; 2534 goto free; 2535 } 2536 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2537 /* DA BSSID SA */ 2538 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2539 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2540 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2541 hdrlen = 24; 2542 band = chanctx_conf->def.chan->band; 2543 break; 2544 case NL80211_IFTYPE_WDS: 2545 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2546 /* RA TA DA SA */ 2547 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2548 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2549 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2550 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2551 hdrlen = 30; 2552 /* 2553 * This is the exception! WDS style interfaces are prohibited 2554 * when channel contexts are in used so this must be valid 2555 */ 2556 band = local->hw.conf.chandef.chan->band; 2557 break; 2558 #ifdef CONFIG_MAC80211_MESH 2559 case NL80211_IFTYPE_MESH_POINT: 2560 if (!is_multicast_ether_addr(skb->data)) { 2561 struct sta_info *next_hop; 2562 bool mpp_lookup = true; 2563 2564 mpath = mesh_path_lookup(sdata, skb->data); 2565 if (mpath) { 2566 mpp_lookup = false; 2567 next_hop = rcu_dereference(mpath->next_hop); 2568 if (!next_hop || 2569 !(mpath->flags & (MESH_PATH_ACTIVE | 2570 MESH_PATH_RESOLVING))) 2571 mpp_lookup = true; 2572 } 2573 2574 if (mpp_lookup) { 2575 mppath = mpp_path_lookup(sdata, skb->data); 2576 if (mppath) 2577 mppath->exp_time = jiffies; 2578 } 2579 2580 if (mppath && mpath) 2581 mesh_path_del(sdata, mpath->dst); 2582 } 2583 2584 /* 2585 * Use address extension if it is a packet from 2586 * another interface or if we know the destination 2587 * is being proxied by a portal (i.e. portal address 2588 * differs from proxied address) 2589 */ 2590 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2591 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2592 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2593 skb->data, skb->data + ETH_ALEN); 2594 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2595 NULL, NULL); 2596 } else { 2597 /* DS -> MBSS (802.11-2012 13.11.3.3). 2598 * For unicast with unknown forwarding information, 2599 * destination might be in the MBSS or if that fails 2600 * forwarded to another mesh gate. In either case 2601 * resolution will be handled in ieee80211_xmit(), so 2602 * leave the original DA. This also works for mcast */ 2603 const u8 *mesh_da = skb->data; 2604 2605 if (mppath) 2606 mesh_da = mppath->mpp; 2607 else if (mpath) 2608 mesh_da = mpath->dst; 2609 2610 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2611 mesh_da, sdata->vif.addr); 2612 if (is_multicast_ether_addr(mesh_da)) 2613 /* DA TA mSA AE:SA */ 2614 meshhdrlen = ieee80211_new_mesh_header( 2615 sdata, &mesh_hdr, 2616 skb->data + ETH_ALEN, NULL); 2617 else 2618 /* RA TA mDA mSA AE:DA SA */ 2619 meshhdrlen = ieee80211_new_mesh_header( 2620 sdata, &mesh_hdr, skb->data, 2621 skb->data + ETH_ALEN); 2622 2623 } 2624 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2625 if (!chanctx_conf) { 2626 ret = -ENOTCONN; 2627 goto free; 2628 } 2629 band = chanctx_conf->def.chan->band; 2630 2631 /* For injected frames, fill RA right away as nexthop lookup 2632 * will be skipped. 2633 */ 2634 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2635 is_zero_ether_addr(hdr.addr1)) 2636 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2637 break; 2638 #endif 2639 case NL80211_IFTYPE_STATION: 2640 /* we already did checks when looking up the RA STA */ 2641 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2642 2643 if (tdls_peer) { 2644 /* DA SA BSSID */ 2645 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2646 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2647 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2648 hdrlen = 24; 2649 } else if (sdata->u.mgd.use_4addr && 2650 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2651 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2652 IEEE80211_FCTL_TODS); 2653 /* RA TA DA SA */ 2654 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2655 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2656 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2657 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2658 hdrlen = 30; 2659 } else { 2660 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2661 /* BSSID SA DA */ 2662 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2663 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2664 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2665 hdrlen = 24; 2666 } 2667 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2668 if (!chanctx_conf) { 2669 ret = -ENOTCONN; 2670 goto free; 2671 } 2672 band = chanctx_conf->def.chan->band; 2673 break; 2674 case NL80211_IFTYPE_OCB: 2675 /* DA SA BSSID */ 2676 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2677 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2678 eth_broadcast_addr(hdr.addr3); 2679 hdrlen = 24; 2680 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2681 if (!chanctx_conf) { 2682 ret = -ENOTCONN; 2683 goto free; 2684 } 2685 band = chanctx_conf->def.chan->band; 2686 break; 2687 case NL80211_IFTYPE_ADHOC: 2688 /* DA SA BSSID */ 2689 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2690 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2691 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2692 hdrlen = 24; 2693 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2694 if (!chanctx_conf) { 2695 ret = -ENOTCONN; 2696 goto free; 2697 } 2698 band = chanctx_conf->def.chan->band; 2699 break; 2700 default: 2701 ret = -EINVAL; 2702 goto free; 2703 } 2704 2705 multicast = is_multicast_ether_addr(hdr.addr1); 2706 2707 /* sta is always NULL for mesh */ 2708 if (sta) { 2709 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2710 wme_sta = sta->sta.wme; 2711 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2712 /* For mesh, the use of the QoS header is mandatory */ 2713 wme_sta = true; 2714 } 2715 2716 /* receiver does QoS (which also means we do) use it */ 2717 if (wme_sta) { 2718 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2719 hdrlen += 2; 2720 } 2721 2722 /* 2723 * Drop unicast frames to unauthorised stations unless they are 2724 * EAPOL frames from the local station. 2725 */ 2726 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2727 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2728 !multicast && !authorized && 2729 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2730 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2731 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2732 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2733 sdata->name, hdr.addr1); 2734 #endif 2735 2736 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2737 2738 ret = -EPERM; 2739 goto free; 2740 } 2741 2742 if (unlikely(!multicast && skb->sk && 2743 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 2744 info_id = ieee80211_store_ack_skb(local, skb, &info_flags); 2745 2746 /* 2747 * If the skb is shared we need to obtain our own copy. 2748 */ 2749 if (skb_shared(skb)) { 2750 struct sk_buff *tmp_skb = skb; 2751 2752 /* can't happen -- skb is a clone if info_id != 0 */ 2753 WARN_ON(info_id); 2754 2755 skb = skb_clone(skb, GFP_ATOMIC); 2756 kfree_skb(tmp_skb); 2757 2758 if (!skb) { 2759 ret = -ENOMEM; 2760 goto free; 2761 } 2762 } 2763 2764 hdr.frame_control = fc; 2765 hdr.duration_id = 0; 2766 hdr.seq_ctrl = 0; 2767 2768 skip_header_bytes = ETH_HLEN; 2769 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2770 encaps_data = bridge_tunnel_header; 2771 encaps_len = sizeof(bridge_tunnel_header); 2772 skip_header_bytes -= 2; 2773 } else if (ethertype >= ETH_P_802_3_MIN) { 2774 encaps_data = rfc1042_header; 2775 encaps_len = sizeof(rfc1042_header); 2776 skip_header_bytes -= 2; 2777 } else { 2778 encaps_data = NULL; 2779 encaps_len = 0; 2780 } 2781 2782 skb_pull(skb, skip_header_bytes); 2783 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2784 2785 /* 2786 * So we need to modify the skb header and hence need a copy of 2787 * that. The head_need variable above doesn't, so far, include 2788 * the needed header space that we don't need right away. If we 2789 * can, then we don't reallocate right now but only after the 2790 * frame arrives at the master device (if it does...) 2791 * 2792 * If we cannot, however, then we will reallocate to include all 2793 * the ever needed space. Also, if we need to reallocate it anyway, 2794 * make it big enough for everything we may ever need. 2795 */ 2796 2797 if (head_need > 0 || skb_cloned(skb)) { 2798 head_need += sdata->encrypt_headroom; 2799 head_need += local->tx_headroom; 2800 head_need = max_t(int, 0, head_need); 2801 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2802 ieee80211_free_txskb(&local->hw, skb); 2803 skb = NULL; 2804 return ERR_PTR(-ENOMEM); 2805 } 2806 } 2807 2808 if (encaps_data) 2809 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2810 2811 #ifdef CONFIG_MAC80211_MESH 2812 if (meshhdrlen > 0) 2813 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2814 #endif 2815 2816 if (ieee80211_is_data_qos(fc)) { 2817 __le16 *qos_control; 2818 2819 qos_control = skb_push(skb, 2); 2820 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2821 /* 2822 * Maybe we could actually set some fields here, for now just 2823 * initialise to zero to indicate no special operation. 2824 */ 2825 *qos_control = 0; 2826 } else 2827 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2828 2829 skb_reset_mac_header(skb); 2830 2831 info = IEEE80211_SKB_CB(skb); 2832 memset(info, 0, sizeof(*info)); 2833 2834 info->flags = info_flags; 2835 info->ack_frame_id = info_id; 2836 info->band = band; 2837 info->control.flags = ctrl_flags; 2838 2839 return skb; 2840 free: 2841 kfree_skb(skb); 2842 return ERR_PTR(ret); 2843 } 2844 2845 /* 2846 * fast-xmit overview 2847 * 2848 * The core idea of this fast-xmit is to remove per-packet checks by checking 2849 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2850 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2851 * much less work can be done per packet. For example, fragmentation must be 2852 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2853 * in the code here. 2854 * 2855 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2856 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2857 * 2858 * The most difficult part of this is that when any of these assumptions 2859 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2860 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2861 * since the per-packet code no longer checks the conditions. This is reflected 2862 * by the calls to these functions throughout the rest of the code, and must be 2863 * maintained if any of the TX path checks change. 2864 */ 2865 2866 void ieee80211_check_fast_xmit(struct sta_info *sta) 2867 { 2868 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2869 struct ieee80211_local *local = sta->local; 2870 struct ieee80211_sub_if_data *sdata = sta->sdata; 2871 struct ieee80211_hdr *hdr = (void *)build.hdr; 2872 struct ieee80211_chanctx_conf *chanctx_conf; 2873 __le16 fc; 2874 2875 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2876 return; 2877 2878 /* Locking here protects both the pointer itself, and against concurrent 2879 * invocations winning data access races to, e.g., the key pointer that 2880 * is used. 2881 * Without it, the invocation of this function right after the key 2882 * pointer changes wouldn't be sufficient, as another CPU could access 2883 * the pointer, then stall, and then do the cache update after the CPU 2884 * that invalidated the key. 2885 * With the locking, such scenarios cannot happen as the check for the 2886 * key and the fast-tx assignment are done atomically, so the CPU that 2887 * modifies the key will either wait or other one will see the key 2888 * cleared/changed already. 2889 */ 2890 spin_lock_bh(&sta->lock); 2891 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2892 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2893 sdata->vif.type == NL80211_IFTYPE_STATION) 2894 goto out; 2895 2896 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2897 goto out; 2898 2899 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2900 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2901 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2902 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2903 goto out; 2904 2905 if (sdata->noack_map) 2906 goto out; 2907 2908 /* fast-xmit doesn't handle fragmentation at all */ 2909 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2910 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2911 goto out; 2912 2913 rcu_read_lock(); 2914 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2915 if (!chanctx_conf) { 2916 rcu_read_unlock(); 2917 goto out; 2918 } 2919 build.band = chanctx_conf->def.chan->band; 2920 rcu_read_unlock(); 2921 2922 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2923 2924 switch (sdata->vif.type) { 2925 case NL80211_IFTYPE_ADHOC: 2926 /* DA SA BSSID */ 2927 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2928 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2929 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2930 build.hdr_len = 24; 2931 break; 2932 case NL80211_IFTYPE_STATION: 2933 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2934 /* DA SA BSSID */ 2935 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2936 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2937 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2938 build.hdr_len = 24; 2939 break; 2940 } 2941 2942 if (sdata->u.mgd.use_4addr) { 2943 /* non-regular ethertype cannot use the fastpath */ 2944 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2945 IEEE80211_FCTL_TODS); 2946 /* RA TA DA SA */ 2947 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2948 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2949 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2950 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2951 build.hdr_len = 30; 2952 break; 2953 } 2954 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2955 /* BSSID SA DA */ 2956 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2957 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2958 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2959 build.hdr_len = 24; 2960 break; 2961 case NL80211_IFTYPE_AP_VLAN: 2962 if (sdata->wdev.use_4addr) { 2963 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2964 IEEE80211_FCTL_TODS); 2965 /* RA TA DA SA */ 2966 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2967 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2968 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2969 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2970 build.hdr_len = 30; 2971 break; 2972 } 2973 /* fall through */ 2974 case NL80211_IFTYPE_AP: 2975 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2976 /* DA BSSID SA */ 2977 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2978 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2979 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2980 build.hdr_len = 24; 2981 break; 2982 default: 2983 /* not handled on fast-xmit */ 2984 goto out; 2985 } 2986 2987 if (sta->sta.wme) { 2988 build.hdr_len += 2; 2989 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2990 } 2991 2992 /* We store the key here so there's no point in using rcu_dereference() 2993 * but that's fine because the code that changes the pointers will call 2994 * this function after doing so. For a single CPU that would be enough, 2995 * for multiple see the comment above. 2996 */ 2997 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2998 if (!build.key) 2999 build.key = rcu_access_pointer(sdata->default_unicast_key); 3000 if (build.key) { 3001 bool gen_iv, iv_spc, mmic; 3002 3003 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3004 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3005 mmic = build.key->conf.flags & 3006 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3007 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3008 3009 /* don't handle software crypto */ 3010 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3011 goto out; 3012 3013 /* Key is being removed */ 3014 if (build.key->flags & KEY_FLAG_TAINTED) 3015 goto out; 3016 3017 switch (build.key->conf.cipher) { 3018 case WLAN_CIPHER_SUITE_CCMP: 3019 case WLAN_CIPHER_SUITE_CCMP_256: 3020 if (gen_iv) 3021 build.pn_offs = build.hdr_len; 3022 if (gen_iv || iv_spc) 3023 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3024 break; 3025 case WLAN_CIPHER_SUITE_GCMP: 3026 case WLAN_CIPHER_SUITE_GCMP_256: 3027 if (gen_iv) 3028 build.pn_offs = build.hdr_len; 3029 if (gen_iv || iv_spc) 3030 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3031 break; 3032 case WLAN_CIPHER_SUITE_TKIP: 3033 /* cannot handle MMIC or IV generation in xmit-fast */ 3034 if (mmic || gen_iv) 3035 goto out; 3036 if (iv_spc) 3037 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3038 break; 3039 case WLAN_CIPHER_SUITE_WEP40: 3040 case WLAN_CIPHER_SUITE_WEP104: 3041 /* cannot handle IV generation in fast-xmit */ 3042 if (gen_iv) 3043 goto out; 3044 if (iv_spc) 3045 build.hdr_len += IEEE80211_WEP_IV_LEN; 3046 break; 3047 case WLAN_CIPHER_SUITE_AES_CMAC: 3048 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3049 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3050 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3051 WARN(1, 3052 "management cipher suite 0x%x enabled for data\n", 3053 build.key->conf.cipher); 3054 goto out; 3055 default: 3056 /* we don't know how to generate IVs for this at all */ 3057 if (WARN_ON(gen_iv)) 3058 goto out; 3059 /* pure hardware keys are OK, of course */ 3060 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3061 break; 3062 /* cipher scheme might require space allocation */ 3063 if (iv_spc && 3064 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3065 goto out; 3066 if (iv_spc) 3067 build.hdr_len += build.key->conf.iv_len; 3068 } 3069 3070 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3071 } 3072 3073 hdr->frame_control = fc; 3074 3075 memcpy(build.hdr + build.hdr_len, 3076 rfc1042_header, sizeof(rfc1042_header)); 3077 build.hdr_len += sizeof(rfc1042_header); 3078 3079 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3080 /* if the kmemdup fails, continue w/o fast_tx */ 3081 if (!fast_tx) 3082 goto out; 3083 3084 out: 3085 /* we might have raced against another call to this function */ 3086 old = rcu_dereference_protected(sta->fast_tx, 3087 lockdep_is_held(&sta->lock)); 3088 rcu_assign_pointer(sta->fast_tx, fast_tx); 3089 if (old) 3090 kfree_rcu(old, rcu_head); 3091 spin_unlock_bh(&sta->lock); 3092 } 3093 3094 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3095 { 3096 struct sta_info *sta; 3097 3098 rcu_read_lock(); 3099 list_for_each_entry_rcu(sta, &local->sta_list, list) 3100 ieee80211_check_fast_xmit(sta); 3101 rcu_read_unlock(); 3102 } 3103 3104 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3105 { 3106 struct ieee80211_local *local = sdata->local; 3107 struct sta_info *sta; 3108 3109 rcu_read_lock(); 3110 3111 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3112 if (sdata != sta->sdata && 3113 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3114 continue; 3115 ieee80211_check_fast_xmit(sta); 3116 } 3117 3118 rcu_read_unlock(); 3119 } 3120 3121 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3122 { 3123 struct ieee80211_fast_tx *fast_tx; 3124 3125 spin_lock_bh(&sta->lock); 3126 fast_tx = rcu_dereference_protected(sta->fast_tx, 3127 lockdep_is_held(&sta->lock)); 3128 RCU_INIT_POINTER(sta->fast_tx, NULL); 3129 spin_unlock_bh(&sta->lock); 3130 3131 if (fast_tx) 3132 kfree_rcu(fast_tx, rcu_head); 3133 } 3134 3135 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3136 struct sk_buff *skb, int headroom) 3137 { 3138 if (skb_headroom(skb) < headroom) { 3139 I802_DEBUG_INC(local->tx_expand_skb_head); 3140 3141 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3142 wiphy_debug(local->hw.wiphy, 3143 "failed to reallocate TX buffer\n"); 3144 return false; 3145 } 3146 } 3147 3148 return true; 3149 } 3150 3151 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3152 struct ieee80211_fast_tx *fast_tx, 3153 struct sk_buff *skb) 3154 { 3155 struct ieee80211_local *local = sdata->local; 3156 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3157 struct ieee80211_hdr *hdr; 3158 struct ethhdr *amsdu_hdr; 3159 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3160 int subframe_len = skb->len - hdr_len; 3161 void *data; 3162 u8 *qc, *h_80211_src, *h_80211_dst; 3163 const u8 *bssid; 3164 3165 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3166 return false; 3167 3168 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3169 return true; 3170 3171 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3172 return false; 3173 3174 data = skb_push(skb, sizeof(*amsdu_hdr)); 3175 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3176 hdr = data; 3177 amsdu_hdr = data + hdr_len; 3178 /* h_80211_src/dst is addr* field within hdr */ 3179 h_80211_src = data + fast_tx->sa_offs; 3180 h_80211_dst = data + fast_tx->da_offs; 3181 3182 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3183 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3184 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3185 3186 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3187 * fields needs to be changed to BSSID for A-MSDU frames depending 3188 * on FromDS/ToDS values. 3189 */ 3190 switch (sdata->vif.type) { 3191 case NL80211_IFTYPE_STATION: 3192 bssid = sdata->u.mgd.bssid; 3193 break; 3194 case NL80211_IFTYPE_AP: 3195 case NL80211_IFTYPE_AP_VLAN: 3196 bssid = sdata->vif.addr; 3197 break; 3198 default: 3199 bssid = NULL; 3200 } 3201 3202 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3203 ether_addr_copy(h_80211_src, bssid); 3204 3205 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3206 ether_addr_copy(h_80211_dst, bssid); 3207 3208 qc = ieee80211_get_qos_ctl(hdr); 3209 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3210 3211 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3212 3213 return true; 3214 } 3215 3216 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3217 struct sta_info *sta, 3218 struct ieee80211_fast_tx *fast_tx, 3219 struct sk_buff *skb) 3220 { 3221 struct ieee80211_local *local = sdata->local; 3222 struct fq *fq = &local->fq; 3223 struct fq_tin *tin; 3224 struct fq_flow *flow; 3225 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3226 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3227 struct txq_info *txqi; 3228 struct sk_buff **frag_tail, *head; 3229 int subframe_len = skb->len - ETH_ALEN; 3230 u8 max_subframes = sta->sta.max_amsdu_subframes; 3231 int max_frags = local->hw.max_tx_fragments; 3232 int max_amsdu_len = sta->sta.max_amsdu_len; 3233 int orig_truesize; 3234 u32 flow_idx; 3235 __be16 len; 3236 void *data; 3237 bool ret = false; 3238 unsigned int orig_len; 3239 int n = 2, nfrags, pad = 0; 3240 u16 hdrlen; 3241 3242 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3243 return false; 3244 3245 if (skb_is_gso(skb)) 3246 return false; 3247 3248 if (!txq) 3249 return false; 3250 3251 txqi = to_txq_info(txq); 3252 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3253 return false; 3254 3255 if (sta->sta.max_rc_amsdu_len) 3256 max_amsdu_len = min_t(int, max_amsdu_len, 3257 sta->sta.max_rc_amsdu_len); 3258 3259 if (sta->sta.max_tid_amsdu_len[tid]) 3260 max_amsdu_len = min_t(int, max_amsdu_len, 3261 sta->sta.max_tid_amsdu_len[tid]); 3262 3263 flow_idx = fq_flow_idx(fq, skb); 3264 3265 spin_lock_bh(&fq->lock); 3266 3267 /* TODO: Ideally aggregation should be done on dequeue to remain 3268 * responsive to environment changes. 3269 */ 3270 3271 tin = &txqi->tin; 3272 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3273 fq_flow_get_default_func); 3274 head = skb_peek_tail(&flow->queue); 3275 if (!head || skb_is_gso(head)) 3276 goto out; 3277 3278 orig_truesize = head->truesize; 3279 orig_len = head->len; 3280 3281 if (skb->len + head->len > max_amsdu_len) 3282 goto out; 3283 3284 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3285 nfrags += 1 + skb_shinfo(head)->nr_frags; 3286 frag_tail = &skb_shinfo(head)->frag_list; 3287 while (*frag_tail) { 3288 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3289 frag_tail = &(*frag_tail)->next; 3290 n++; 3291 } 3292 3293 if (max_subframes && n > max_subframes) 3294 goto out; 3295 3296 if (max_frags && nfrags > max_frags) 3297 goto out; 3298 3299 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3300 goto out; 3301 3302 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3303 goto out; 3304 3305 /* 3306 * Pad out the previous subframe to a multiple of 4 by adding the 3307 * padding to the next one, that's being added. Note that head->len 3308 * is the length of the full A-MSDU, but that works since each time 3309 * we add a new subframe we pad out the previous one to a multiple 3310 * of 4 and thus it no longer matters in the next round. 3311 */ 3312 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3313 if ((head->len - hdrlen) & 3) 3314 pad = 4 - ((head->len - hdrlen) & 3); 3315 3316 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3317 2 + pad)) 3318 goto out_recalc; 3319 3320 ret = true; 3321 data = skb_push(skb, ETH_ALEN + 2); 3322 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3323 3324 data += 2 * ETH_ALEN; 3325 len = cpu_to_be16(subframe_len); 3326 memcpy(data, &len, 2); 3327 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3328 3329 memset(skb_push(skb, pad), 0, pad); 3330 3331 head->len += skb->len; 3332 head->data_len += skb->len; 3333 *frag_tail = skb; 3334 3335 out_recalc: 3336 fq->memory_usage += head->truesize - orig_truesize; 3337 if (head->len != orig_len) { 3338 flow->backlog += head->len - orig_len; 3339 tin->backlog_bytes += head->len - orig_len; 3340 3341 fq_recalc_backlog(fq, tin, flow); 3342 } 3343 out: 3344 spin_unlock_bh(&fq->lock); 3345 3346 return ret; 3347 } 3348 3349 /* 3350 * Can be called while the sta lock is held. Anything that can cause packets to 3351 * be generated will cause deadlock! 3352 */ 3353 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3354 struct sta_info *sta, u8 pn_offs, 3355 struct ieee80211_key *key, 3356 struct sk_buff *skb) 3357 { 3358 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3359 struct ieee80211_hdr *hdr = (void *)skb->data; 3360 u8 tid = IEEE80211_NUM_TIDS; 3361 3362 if (key) 3363 info->control.hw_key = &key->conf; 3364 3365 ieee80211_tx_stats(skb->dev, skb->len); 3366 3367 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3368 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3369 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3370 } else { 3371 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3372 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3373 sdata->sequence_number += 0x10; 3374 } 3375 3376 if (skb_shinfo(skb)->gso_size) 3377 sta->tx_stats.msdu[tid] += 3378 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3379 else 3380 sta->tx_stats.msdu[tid]++; 3381 3382 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3383 3384 /* statistics normally done by ieee80211_tx_h_stats (but that 3385 * has to consider fragmentation, so is more complex) 3386 */ 3387 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3388 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3389 3390 if (pn_offs) { 3391 u64 pn; 3392 u8 *crypto_hdr = skb->data + pn_offs; 3393 3394 switch (key->conf.cipher) { 3395 case WLAN_CIPHER_SUITE_CCMP: 3396 case WLAN_CIPHER_SUITE_CCMP_256: 3397 case WLAN_CIPHER_SUITE_GCMP: 3398 case WLAN_CIPHER_SUITE_GCMP_256: 3399 pn = atomic64_inc_return(&key->conf.tx_pn); 3400 crypto_hdr[0] = pn; 3401 crypto_hdr[1] = pn >> 8; 3402 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3403 crypto_hdr[4] = pn >> 16; 3404 crypto_hdr[5] = pn >> 24; 3405 crypto_hdr[6] = pn >> 32; 3406 crypto_hdr[7] = pn >> 40; 3407 break; 3408 } 3409 } 3410 } 3411 3412 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3413 struct sta_info *sta, 3414 struct ieee80211_fast_tx *fast_tx, 3415 struct sk_buff *skb) 3416 { 3417 struct ieee80211_local *local = sdata->local; 3418 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3419 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3420 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3421 struct ethhdr eth; 3422 struct ieee80211_tx_info *info; 3423 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3424 struct ieee80211_tx_data tx; 3425 ieee80211_tx_result r; 3426 struct tid_ampdu_tx *tid_tx = NULL; 3427 u8 tid = IEEE80211_NUM_TIDS; 3428 3429 /* control port protocol needs a lot of special handling */ 3430 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3431 return false; 3432 3433 /* only RFC 1042 SNAP */ 3434 if (ethertype < ETH_P_802_3_MIN) 3435 return false; 3436 3437 /* don't handle TX status request here either */ 3438 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3439 return false; 3440 3441 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3442 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3443 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3444 if (tid_tx) { 3445 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3446 return false; 3447 if (tid_tx->timeout) 3448 tid_tx->last_tx = jiffies; 3449 } 3450 } 3451 3452 /* after this point (skb is modified) we cannot return false */ 3453 3454 if (skb_shared(skb)) { 3455 struct sk_buff *tmp_skb = skb; 3456 3457 skb = skb_clone(skb, GFP_ATOMIC); 3458 kfree_skb(tmp_skb); 3459 3460 if (!skb) 3461 return true; 3462 } 3463 3464 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3465 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3466 return true; 3467 3468 /* will not be crypto-handled beyond what we do here, so use false 3469 * as the may-encrypt argument for the resize to not account for 3470 * more room than we already have in 'extra_head' 3471 */ 3472 if (unlikely(ieee80211_skb_resize(sdata, skb, 3473 max_t(int, extra_head + hw_headroom - 3474 skb_headroom(skb), 0), 3475 false))) { 3476 kfree_skb(skb); 3477 return true; 3478 } 3479 3480 memcpy(ð, skb->data, ETH_HLEN - 2); 3481 hdr = skb_push(skb, extra_head); 3482 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3483 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3484 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3485 3486 info = IEEE80211_SKB_CB(skb); 3487 memset(info, 0, sizeof(*info)); 3488 info->band = fast_tx->band; 3489 info->control.vif = &sdata->vif; 3490 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3491 IEEE80211_TX_CTL_DONTFRAG | 3492 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3493 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3494 3495 #ifdef CONFIG_MAC80211_DEBUGFS 3496 if (local->force_tx_status) 3497 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3498 #endif 3499 3500 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3501 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3502 *ieee80211_get_qos_ctl(hdr) = tid; 3503 } 3504 3505 __skb_queue_head_init(&tx.skbs); 3506 3507 tx.flags = IEEE80211_TX_UNICAST; 3508 tx.local = local; 3509 tx.sdata = sdata; 3510 tx.sta = sta; 3511 tx.key = fast_tx->key; 3512 3513 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3514 tx.skb = skb; 3515 r = ieee80211_tx_h_rate_ctrl(&tx); 3516 skb = tx.skb; 3517 tx.skb = NULL; 3518 3519 if (r != TX_CONTINUE) { 3520 if (r != TX_QUEUED) 3521 kfree_skb(skb); 3522 return true; 3523 } 3524 } 3525 3526 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3527 return true; 3528 3529 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3530 fast_tx->key, skb); 3531 3532 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3533 sdata = container_of(sdata->bss, 3534 struct ieee80211_sub_if_data, u.ap); 3535 3536 __skb_queue_tail(&tx.skbs, skb); 3537 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3538 return true; 3539 } 3540 3541 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3542 struct ieee80211_txq *txq) 3543 { 3544 struct ieee80211_local *local = hw_to_local(hw); 3545 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3546 struct ieee80211_hdr *hdr; 3547 struct sk_buff *skb = NULL; 3548 struct fq *fq = &local->fq; 3549 struct fq_tin *tin = &txqi->tin; 3550 struct ieee80211_tx_info *info; 3551 struct ieee80211_tx_data tx; 3552 ieee80211_tx_result r; 3553 struct ieee80211_vif *vif = txq->vif; 3554 3555 WARN_ON_ONCE(softirq_count() == 0); 3556 3557 if (!ieee80211_txq_airtime_check(hw, txq)) 3558 return NULL; 3559 3560 begin: 3561 spin_lock_bh(&fq->lock); 3562 3563 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3564 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3565 goto out; 3566 3567 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3568 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3569 goto out; 3570 } 3571 3572 /* Make sure fragments stay together. */ 3573 skb = __skb_dequeue(&txqi->frags); 3574 if (skb) 3575 goto out; 3576 3577 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3578 if (!skb) 3579 goto out; 3580 3581 spin_unlock_bh(&fq->lock); 3582 3583 hdr = (struct ieee80211_hdr *)skb->data; 3584 info = IEEE80211_SKB_CB(skb); 3585 3586 memset(&tx, 0, sizeof(tx)); 3587 __skb_queue_head_init(&tx.skbs); 3588 tx.local = local; 3589 tx.skb = skb; 3590 tx.sdata = vif_to_sdata(info->control.vif); 3591 3592 if (txq->sta) 3593 tx.sta = container_of(txq->sta, struct sta_info, sta); 3594 3595 /* 3596 * The key can be removed while the packet was queued, so need to call 3597 * this here to get the current key. 3598 */ 3599 r = ieee80211_tx_h_select_key(&tx); 3600 if (r != TX_CONTINUE) { 3601 ieee80211_free_txskb(&local->hw, skb); 3602 goto begin; 3603 } 3604 3605 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3606 info->flags |= IEEE80211_TX_CTL_AMPDU; 3607 else 3608 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3609 3610 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3611 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3612 sta); 3613 u8 pn_offs = 0; 3614 3615 if (tx.key && 3616 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3617 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3618 3619 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3620 tx.key, skb); 3621 } else { 3622 if (invoke_tx_handlers_late(&tx)) 3623 goto begin; 3624 3625 skb = __skb_dequeue(&tx.skbs); 3626 3627 if (!skb_queue_empty(&tx.skbs)) { 3628 spin_lock_bh(&fq->lock); 3629 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3630 spin_unlock_bh(&fq->lock); 3631 } 3632 } 3633 3634 if (skb_has_frag_list(skb) && 3635 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3636 if (skb_linearize(skb)) { 3637 ieee80211_free_txskb(&local->hw, skb); 3638 goto begin; 3639 } 3640 } 3641 3642 switch (tx.sdata->vif.type) { 3643 case NL80211_IFTYPE_MONITOR: 3644 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3645 vif = &tx.sdata->vif; 3646 break; 3647 } 3648 tx.sdata = rcu_dereference(local->monitor_sdata); 3649 if (tx.sdata) { 3650 vif = &tx.sdata->vif; 3651 info->hw_queue = 3652 vif->hw_queue[skb_get_queue_mapping(skb)]; 3653 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3654 ieee80211_free_txskb(&local->hw, skb); 3655 goto begin; 3656 } else { 3657 vif = NULL; 3658 } 3659 break; 3660 case NL80211_IFTYPE_AP_VLAN: 3661 tx.sdata = container_of(tx.sdata->bss, 3662 struct ieee80211_sub_if_data, u.ap); 3663 /* fall through */ 3664 default: 3665 vif = &tx.sdata->vif; 3666 break; 3667 } 3668 3669 IEEE80211_SKB_CB(skb)->control.vif = vif; 3670 3671 if (local->airtime_flags & AIRTIME_USE_AQL) { 3672 u32 airtime; 3673 3674 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3675 skb->len); 3676 if (airtime) { 3677 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3678 ieee80211_sta_update_pending_airtime(local, tx.sta, 3679 txq->ac, 3680 airtime, 3681 false); 3682 } 3683 } 3684 3685 return skb; 3686 3687 out: 3688 spin_unlock_bh(&fq->lock); 3689 3690 return skb; 3691 } 3692 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3693 3694 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3695 { 3696 struct ieee80211_local *local = hw_to_local(hw); 3697 struct ieee80211_txq *ret = NULL; 3698 struct txq_info *txqi = NULL, *head = NULL; 3699 bool found_eligible_txq = false; 3700 3701 spin_lock_bh(&local->active_txq_lock[ac]); 3702 3703 begin: 3704 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3705 struct txq_info, 3706 schedule_order); 3707 if (!txqi) 3708 goto out; 3709 3710 if (txqi == head) { 3711 if (!found_eligible_txq) 3712 goto out; 3713 else 3714 found_eligible_txq = false; 3715 } 3716 3717 if (!head) 3718 head = txqi; 3719 3720 if (txqi->txq.sta) { 3721 struct sta_info *sta = container_of(txqi->txq.sta, 3722 struct sta_info, sta); 3723 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3724 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3725 3726 if (aql_check) 3727 found_eligible_txq = true; 3728 3729 if (deficit < 0) 3730 sta->airtime[txqi->txq.ac].deficit += 3731 sta->airtime_weight; 3732 3733 if (deficit < 0 || !aql_check) { 3734 list_move_tail(&txqi->schedule_order, 3735 &local->active_txqs[txqi->txq.ac]); 3736 goto begin; 3737 } 3738 } 3739 3740 3741 if (txqi->schedule_round == local->schedule_round[ac]) 3742 goto out; 3743 3744 list_del_init(&txqi->schedule_order); 3745 txqi->schedule_round = local->schedule_round[ac]; 3746 ret = &txqi->txq; 3747 3748 out: 3749 spin_unlock_bh(&local->active_txq_lock[ac]); 3750 return ret; 3751 } 3752 EXPORT_SYMBOL(ieee80211_next_txq); 3753 3754 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3755 struct ieee80211_txq *txq, 3756 bool force) 3757 { 3758 struct ieee80211_local *local = hw_to_local(hw); 3759 struct txq_info *txqi = to_txq_info(txq); 3760 3761 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3762 3763 if (list_empty(&txqi->schedule_order) && 3764 (force || !skb_queue_empty(&txqi->frags) || 3765 txqi->tin.backlog_packets)) { 3766 /* If airtime accounting is active, always enqueue STAs at the 3767 * head of the list to ensure that they only get moved to the 3768 * back by the airtime DRR scheduler once they have a negative 3769 * deficit. A station that already has a negative deficit will 3770 * get immediately moved to the back of the list on the next 3771 * call to ieee80211_next_txq(). 3772 */ 3773 if (txqi->txq.sta && 3774 wiphy_ext_feature_isset(local->hw.wiphy, 3775 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3776 list_add(&txqi->schedule_order, 3777 &local->active_txqs[txq->ac]); 3778 else 3779 list_add_tail(&txqi->schedule_order, 3780 &local->active_txqs[txq->ac]); 3781 } 3782 3783 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3784 } 3785 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3786 3787 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3788 struct ieee80211_txq *txq) 3789 { 3790 struct sta_info *sta; 3791 struct ieee80211_local *local = hw_to_local(hw); 3792 3793 if (!(local->airtime_flags & AIRTIME_USE_AQL)) 3794 return true; 3795 3796 if (!txq->sta) 3797 return true; 3798 3799 sta = container_of(txq->sta, struct sta_info, sta); 3800 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3801 sta->airtime[txq->ac].aql_limit_low) 3802 return true; 3803 3804 if (atomic_read(&local->aql_total_pending_airtime) < 3805 local->aql_threshold && 3806 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3807 sta->airtime[txq->ac].aql_limit_high) 3808 return true; 3809 3810 return false; 3811 } 3812 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3813 3814 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3815 struct ieee80211_txq *txq) 3816 { 3817 struct ieee80211_local *local = hw_to_local(hw); 3818 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3819 struct sta_info *sta; 3820 u8 ac = txq->ac; 3821 3822 spin_lock_bh(&local->active_txq_lock[ac]); 3823 3824 if (!txqi->txq.sta) 3825 goto out; 3826 3827 if (list_empty(&txqi->schedule_order)) 3828 goto out; 3829 3830 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3831 schedule_order) { 3832 if (iter == txqi) 3833 break; 3834 3835 if (!iter->txq.sta) { 3836 list_move_tail(&iter->schedule_order, 3837 &local->active_txqs[ac]); 3838 continue; 3839 } 3840 sta = container_of(iter->txq.sta, struct sta_info, sta); 3841 if (sta->airtime[ac].deficit < 0) 3842 sta->airtime[ac].deficit += sta->airtime_weight; 3843 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3844 } 3845 3846 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3847 if (sta->airtime[ac].deficit >= 0) 3848 goto out; 3849 3850 sta->airtime[ac].deficit += sta->airtime_weight; 3851 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3852 spin_unlock_bh(&local->active_txq_lock[ac]); 3853 3854 return false; 3855 out: 3856 if (!list_empty(&txqi->schedule_order)) 3857 list_del_init(&txqi->schedule_order); 3858 spin_unlock_bh(&local->active_txq_lock[ac]); 3859 3860 return true; 3861 } 3862 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3863 3864 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3865 { 3866 struct ieee80211_local *local = hw_to_local(hw); 3867 3868 spin_lock_bh(&local->active_txq_lock[ac]); 3869 local->schedule_round[ac]++; 3870 spin_unlock_bh(&local->active_txq_lock[ac]); 3871 } 3872 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3873 3874 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3875 struct net_device *dev, 3876 u32 info_flags, 3877 u32 ctrl_flags) 3878 { 3879 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3880 struct ieee80211_local *local = sdata->local; 3881 struct sta_info *sta; 3882 struct sk_buff *next; 3883 3884 if (unlikely(skb->len < ETH_HLEN)) { 3885 kfree_skb(skb); 3886 return; 3887 } 3888 3889 rcu_read_lock(); 3890 3891 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3892 goto out_free; 3893 3894 if (IS_ERR(sta)) 3895 sta = NULL; 3896 3897 if (local->ops->wake_tx_queue) { 3898 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3899 skb_set_queue_mapping(skb, queue); 3900 } 3901 3902 if (sta) { 3903 struct ieee80211_fast_tx *fast_tx; 3904 3905 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3906 3907 fast_tx = rcu_dereference(sta->fast_tx); 3908 3909 if (fast_tx && 3910 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3911 goto out; 3912 } 3913 3914 if (skb_is_gso(skb)) { 3915 struct sk_buff *segs; 3916 3917 segs = skb_gso_segment(skb, 0); 3918 if (IS_ERR(segs)) { 3919 goto out_free; 3920 } else if (segs) { 3921 consume_skb(skb); 3922 skb = segs; 3923 } 3924 } else { 3925 /* we cannot process non-linear frames on this path */ 3926 if (skb_linearize(skb)) { 3927 kfree_skb(skb); 3928 goto out; 3929 } 3930 3931 /* the frame could be fragmented, software-encrypted, and other 3932 * things so we cannot really handle checksum offload with it - 3933 * fix it up in software before we handle anything else. 3934 */ 3935 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3936 skb_set_transport_header(skb, 3937 skb_checksum_start_offset(skb)); 3938 if (skb_checksum_help(skb)) 3939 goto out_free; 3940 } 3941 } 3942 3943 next = skb; 3944 while (next) { 3945 skb = next; 3946 next = skb->next; 3947 3948 skb->prev = NULL; 3949 skb->next = NULL; 3950 3951 skb = ieee80211_build_hdr(sdata, skb, info_flags, 3952 sta, ctrl_flags); 3953 if (IS_ERR(skb)) 3954 goto out; 3955 3956 ieee80211_tx_stats(dev, skb->len); 3957 3958 ieee80211_xmit(sdata, sta, skb, 0); 3959 } 3960 goto out; 3961 out_free: 3962 kfree_skb(skb); 3963 out: 3964 rcu_read_unlock(); 3965 } 3966 3967 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3968 { 3969 struct ethhdr *eth; 3970 int err; 3971 3972 err = skb_ensure_writable(skb, ETH_HLEN); 3973 if (unlikely(err)) 3974 return err; 3975 3976 eth = (void *)skb->data; 3977 ether_addr_copy(eth->h_dest, sta->sta.addr); 3978 3979 return 0; 3980 } 3981 3982 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3983 struct net_device *dev) 3984 { 3985 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3986 const struct ethhdr *eth = (void *)skb->data; 3987 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3988 __be16 ethertype; 3989 3990 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3991 return false; 3992 3993 switch (sdata->vif.type) { 3994 case NL80211_IFTYPE_AP_VLAN: 3995 if (sdata->u.vlan.sta) 3996 return false; 3997 if (sdata->wdev.use_4addr) 3998 return false; 3999 /* fall through */ 4000 case NL80211_IFTYPE_AP: 4001 /* check runtime toggle for this bss */ 4002 if (!sdata->bss->multicast_to_unicast) 4003 return false; 4004 break; 4005 default: 4006 return false; 4007 } 4008 4009 /* multicast to unicast conversion only for some payload */ 4010 ethertype = eth->h_proto; 4011 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4012 ethertype = ethvlan->h_vlan_encapsulated_proto; 4013 switch (ethertype) { 4014 case htons(ETH_P_ARP): 4015 case htons(ETH_P_IP): 4016 case htons(ETH_P_IPV6): 4017 break; 4018 default: 4019 return false; 4020 } 4021 4022 return true; 4023 } 4024 4025 static void 4026 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4027 struct sk_buff_head *queue) 4028 { 4029 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4030 struct ieee80211_local *local = sdata->local; 4031 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4032 struct sta_info *sta, *first = NULL; 4033 struct sk_buff *cloned_skb; 4034 4035 rcu_read_lock(); 4036 4037 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4038 if (sdata != sta->sdata) 4039 /* AP-VLAN mismatch */ 4040 continue; 4041 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4042 /* do not send back to source */ 4043 continue; 4044 if (!first) { 4045 first = sta; 4046 continue; 4047 } 4048 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4049 if (!cloned_skb) 4050 goto multicast; 4051 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4052 dev_kfree_skb(cloned_skb); 4053 goto multicast; 4054 } 4055 __skb_queue_tail(queue, cloned_skb); 4056 } 4057 4058 if (likely(first)) { 4059 if (unlikely(ieee80211_change_da(skb, first))) 4060 goto multicast; 4061 __skb_queue_tail(queue, skb); 4062 } else { 4063 /* no STA connected, drop */ 4064 kfree_skb(skb); 4065 skb = NULL; 4066 } 4067 4068 goto out; 4069 multicast: 4070 __skb_queue_purge(queue); 4071 __skb_queue_tail(queue, skb); 4072 out: 4073 rcu_read_unlock(); 4074 } 4075 4076 /** 4077 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4078 * @skb: packet to be sent 4079 * @dev: incoming interface 4080 * 4081 * On failure skb will be freed. 4082 */ 4083 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4084 struct net_device *dev) 4085 { 4086 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4087 struct sk_buff_head queue; 4088 4089 __skb_queue_head_init(&queue); 4090 ieee80211_convert_to_unicast(skb, dev, &queue); 4091 while ((skb = __skb_dequeue(&queue))) 4092 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4093 } else { 4094 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4095 } 4096 4097 return NETDEV_TX_OK; 4098 } 4099 4100 struct sk_buff * 4101 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4102 struct sk_buff *skb, u32 info_flags) 4103 { 4104 struct ieee80211_hdr *hdr; 4105 struct ieee80211_tx_data tx = { 4106 .local = sdata->local, 4107 .sdata = sdata, 4108 }; 4109 struct sta_info *sta; 4110 4111 rcu_read_lock(); 4112 4113 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4114 kfree_skb(skb); 4115 skb = ERR_PTR(-EINVAL); 4116 goto out; 4117 } 4118 4119 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0); 4120 if (IS_ERR(skb)) 4121 goto out; 4122 4123 hdr = (void *)skb->data; 4124 tx.sta = sta_info_get(sdata, hdr->addr1); 4125 tx.skb = skb; 4126 4127 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4128 rcu_read_unlock(); 4129 kfree_skb(skb); 4130 return ERR_PTR(-EINVAL); 4131 } 4132 4133 out: 4134 rcu_read_unlock(); 4135 return skb; 4136 } 4137 4138 /* 4139 * ieee80211_clear_tx_pending may not be called in a context where 4140 * it is possible that it packets could come in again. 4141 */ 4142 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4143 { 4144 struct sk_buff *skb; 4145 int i; 4146 4147 for (i = 0; i < local->hw.queues; i++) { 4148 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4149 ieee80211_free_txskb(&local->hw, skb); 4150 } 4151 } 4152 4153 /* 4154 * Returns false if the frame couldn't be transmitted but was queued instead, 4155 * which in this case means re-queued -- take as an indication to stop sending 4156 * more pending frames. 4157 */ 4158 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4159 struct sk_buff *skb) 4160 { 4161 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4162 struct ieee80211_sub_if_data *sdata; 4163 struct sta_info *sta; 4164 struct ieee80211_hdr *hdr; 4165 bool result; 4166 struct ieee80211_chanctx_conf *chanctx_conf; 4167 4168 sdata = vif_to_sdata(info->control.vif); 4169 4170 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 4171 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4172 if (unlikely(!chanctx_conf)) { 4173 dev_kfree_skb(skb); 4174 return true; 4175 } 4176 info->band = chanctx_conf->def.chan->band; 4177 result = ieee80211_tx(sdata, NULL, skb, true, 0); 4178 } else { 4179 struct sk_buff_head skbs; 4180 4181 __skb_queue_head_init(&skbs); 4182 __skb_queue_tail(&skbs, skb); 4183 4184 hdr = (struct ieee80211_hdr *)skb->data; 4185 sta = sta_info_get(sdata, hdr->addr1); 4186 4187 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4188 } 4189 4190 return result; 4191 } 4192 4193 /* 4194 * Transmit all pending packets. Called from tasklet. 4195 */ 4196 void ieee80211_tx_pending(unsigned long data) 4197 { 4198 struct ieee80211_local *local = (struct ieee80211_local *)data; 4199 unsigned long flags; 4200 int i; 4201 bool txok; 4202 4203 rcu_read_lock(); 4204 4205 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4206 for (i = 0; i < local->hw.queues; i++) { 4207 /* 4208 * If queue is stopped by something other than due to pending 4209 * frames, or we have no pending frames, proceed to next queue. 4210 */ 4211 if (local->queue_stop_reasons[i] || 4212 skb_queue_empty(&local->pending[i])) 4213 continue; 4214 4215 while (!skb_queue_empty(&local->pending[i])) { 4216 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4217 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4218 4219 if (WARN_ON(!info->control.vif)) { 4220 ieee80211_free_txskb(&local->hw, skb); 4221 continue; 4222 } 4223 4224 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4225 flags); 4226 4227 txok = ieee80211_tx_pending_skb(local, skb); 4228 spin_lock_irqsave(&local->queue_stop_reason_lock, 4229 flags); 4230 if (!txok) 4231 break; 4232 } 4233 4234 if (skb_queue_empty(&local->pending[i])) 4235 ieee80211_propagate_queue_wake(local, i); 4236 } 4237 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4238 4239 rcu_read_unlock(); 4240 } 4241 4242 /* functions for drivers to get certain frames */ 4243 4244 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4245 struct ps_data *ps, struct sk_buff *skb, 4246 bool is_template) 4247 { 4248 u8 *pos, *tim; 4249 int aid0 = 0; 4250 int i, have_bits = 0, n1, n2; 4251 4252 /* Generate bitmap for TIM only if there are any STAs in power save 4253 * mode. */ 4254 if (atomic_read(&ps->num_sta_ps) > 0) 4255 /* in the hope that this is faster than 4256 * checking byte-for-byte */ 4257 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4258 IEEE80211_MAX_AID+1); 4259 if (!is_template) { 4260 if (ps->dtim_count == 0) 4261 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4262 else 4263 ps->dtim_count--; 4264 } 4265 4266 tim = pos = skb_put(skb, 6); 4267 *pos++ = WLAN_EID_TIM; 4268 *pos++ = 4; 4269 *pos++ = ps->dtim_count; 4270 *pos++ = sdata->vif.bss_conf.dtim_period; 4271 4272 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4273 aid0 = 1; 4274 4275 ps->dtim_bc_mc = aid0 == 1; 4276 4277 if (have_bits) { 4278 /* Find largest even number N1 so that bits numbered 1 through 4279 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4280 * (N2 + 1) x 8 through 2007 are 0. */ 4281 n1 = 0; 4282 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4283 if (ps->tim[i]) { 4284 n1 = i & 0xfe; 4285 break; 4286 } 4287 } 4288 n2 = n1; 4289 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4290 if (ps->tim[i]) { 4291 n2 = i; 4292 break; 4293 } 4294 } 4295 4296 /* Bitmap control */ 4297 *pos++ = n1 | aid0; 4298 /* Part Virt Bitmap */ 4299 skb_put(skb, n2 - n1); 4300 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4301 4302 tim[1] = n2 - n1 + 4; 4303 } else { 4304 *pos++ = aid0; /* Bitmap control */ 4305 *pos++ = 0; /* Part Virt Bitmap */ 4306 } 4307 } 4308 4309 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4310 struct ps_data *ps, struct sk_buff *skb, 4311 bool is_template) 4312 { 4313 struct ieee80211_local *local = sdata->local; 4314 4315 /* 4316 * Not very nice, but we want to allow the driver to call 4317 * ieee80211_beacon_get() as a response to the set_tim() 4318 * callback. That, however, is already invoked under the 4319 * sta_lock to guarantee consistent and race-free update 4320 * of the tim bitmap in mac80211 and the driver. 4321 */ 4322 if (local->tim_in_locked_section) { 4323 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4324 } else { 4325 spin_lock_bh(&local->tim_lock); 4326 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4327 spin_unlock_bh(&local->tim_lock); 4328 } 4329 4330 return 0; 4331 } 4332 4333 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4334 struct beacon_data *beacon) 4335 { 4336 struct probe_resp *resp; 4337 u8 *beacon_data; 4338 size_t beacon_data_len; 4339 int i; 4340 u8 count = beacon->csa_current_counter; 4341 4342 switch (sdata->vif.type) { 4343 case NL80211_IFTYPE_AP: 4344 beacon_data = beacon->tail; 4345 beacon_data_len = beacon->tail_len; 4346 break; 4347 case NL80211_IFTYPE_ADHOC: 4348 beacon_data = beacon->head; 4349 beacon_data_len = beacon->head_len; 4350 break; 4351 case NL80211_IFTYPE_MESH_POINT: 4352 beacon_data = beacon->head; 4353 beacon_data_len = beacon->head_len; 4354 break; 4355 default: 4356 return; 4357 } 4358 4359 rcu_read_lock(); 4360 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4361 resp = rcu_dereference(sdata->u.ap.probe_resp); 4362 4363 if (beacon->csa_counter_offsets[i]) { 4364 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4365 beacon_data_len)) { 4366 rcu_read_unlock(); 4367 return; 4368 } 4369 4370 beacon_data[beacon->csa_counter_offsets[i]] = count; 4371 } 4372 4373 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4374 resp->data[resp->csa_counter_offsets[i]] = count; 4375 } 4376 rcu_read_unlock(); 4377 } 4378 4379 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4380 { 4381 beacon->csa_current_counter--; 4382 4383 /* the counter should never reach 0 */ 4384 WARN_ON_ONCE(!beacon->csa_current_counter); 4385 4386 return beacon->csa_current_counter; 4387 } 4388 4389 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4390 { 4391 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4392 struct beacon_data *beacon = NULL; 4393 u8 count = 0; 4394 4395 rcu_read_lock(); 4396 4397 if (sdata->vif.type == NL80211_IFTYPE_AP) 4398 beacon = rcu_dereference(sdata->u.ap.beacon); 4399 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4400 beacon = rcu_dereference(sdata->u.ibss.presp); 4401 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4402 beacon = rcu_dereference(sdata->u.mesh.beacon); 4403 4404 if (!beacon) 4405 goto unlock; 4406 4407 count = __ieee80211_csa_update_counter(beacon); 4408 4409 unlock: 4410 rcu_read_unlock(); 4411 return count; 4412 } 4413 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4414 4415 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4416 { 4417 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4418 struct beacon_data *beacon = NULL; 4419 4420 rcu_read_lock(); 4421 4422 if (sdata->vif.type == NL80211_IFTYPE_AP) 4423 beacon = rcu_dereference(sdata->u.ap.beacon); 4424 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4425 beacon = rcu_dereference(sdata->u.ibss.presp); 4426 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4427 beacon = rcu_dereference(sdata->u.mesh.beacon); 4428 4429 if (!beacon) 4430 goto unlock; 4431 4432 if (counter < beacon->csa_current_counter) 4433 beacon->csa_current_counter = counter; 4434 4435 unlock: 4436 rcu_read_unlock(); 4437 } 4438 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4439 4440 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4441 { 4442 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4443 struct beacon_data *beacon = NULL; 4444 u8 *beacon_data; 4445 size_t beacon_data_len; 4446 int ret = false; 4447 4448 if (!ieee80211_sdata_running(sdata)) 4449 return false; 4450 4451 rcu_read_lock(); 4452 if (vif->type == NL80211_IFTYPE_AP) { 4453 struct ieee80211_if_ap *ap = &sdata->u.ap; 4454 4455 beacon = rcu_dereference(ap->beacon); 4456 if (WARN_ON(!beacon || !beacon->tail)) 4457 goto out; 4458 beacon_data = beacon->tail; 4459 beacon_data_len = beacon->tail_len; 4460 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4461 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4462 4463 beacon = rcu_dereference(ifibss->presp); 4464 if (!beacon) 4465 goto out; 4466 4467 beacon_data = beacon->head; 4468 beacon_data_len = beacon->head_len; 4469 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4470 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4471 4472 beacon = rcu_dereference(ifmsh->beacon); 4473 if (!beacon) 4474 goto out; 4475 4476 beacon_data = beacon->head; 4477 beacon_data_len = beacon->head_len; 4478 } else { 4479 WARN_ON(1); 4480 goto out; 4481 } 4482 4483 if (!beacon->csa_counter_offsets[0]) 4484 goto out; 4485 4486 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4487 goto out; 4488 4489 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4490 ret = true; 4491 out: 4492 rcu_read_unlock(); 4493 4494 return ret; 4495 } 4496 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4497 4498 static struct sk_buff * 4499 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4500 struct ieee80211_vif *vif, 4501 struct ieee80211_mutable_offsets *offs, 4502 bool is_template) 4503 { 4504 struct ieee80211_local *local = hw_to_local(hw); 4505 struct beacon_data *beacon = NULL; 4506 struct sk_buff *skb = NULL; 4507 struct ieee80211_tx_info *info; 4508 struct ieee80211_sub_if_data *sdata = NULL; 4509 enum nl80211_band band; 4510 struct ieee80211_tx_rate_control txrc; 4511 struct ieee80211_chanctx_conf *chanctx_conf; 4512 int csa_off_base = 0; 4513 4514 rcu_read_lock(); 4515 4516 sdata = vif_to_sdata(vif); 4517 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4518 4519 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4520 goto out; 4521 4522 if (offs) 4523 memset(offs, 0, sizeof(*offs)); 4524 4525 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4526 struct ieee80211_if_ap *ap = &sdata->u.ap; 4527 4528 beacon = rcu_dereference(ap->beacon); 4529 if (beacon) { 4530 if (beacon->csa_counter_offsets[0]) { 4531 if (!is_template) 4532 __ieee80211_csa_update_counter(beacon); 4533 4534 ieee80211_set_csa(sdata, beacon); 4535 } 4536 4537 /* 4538 * headroom, head length, 4539 * tail length and maximum TIM length 4540 */ 4541 skb = dev_alloc_skb(local->tx_headroom + 4542 beacon->head_len + 4543 beacon->tail_len + 256 + 4544 local->hw.extra_beacon_tailroom); 4545 if (!skb) 4546 goto out; 4547 4548 skb_reserve(skb, local->tx_headroom); 4549 skb_put_data(skb, beacon->head, beacon->head_len); 4550 4551 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4552 is_template); 4553 4554 if (offs) { 4555 offs->tim_offset = beacon->head_len; 4556 offs->tim_length = skb->len - beacon->head_len; 4557 4558 /* for AP the csa offsets are from tail */ 4559 csa_off_base = skb->len; 4560 } 4561 4562 if (beacon->tail) 4563 skb_put_data(skb, beacon->tail, 4564 beacon->tail_len); 4565 } else 4566 goto out; 4567 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4568 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4569 struct ieee80211_hdr *hdr; 4570 4571 beacon = rcu_dereference(ifibss->presp); 4572 if (!beacon) 4573 goto out; 4574 4575 if (beacon->csa_counter_offsets[0]) { 4576 if (!is_template) 4577 __ieee80211_csa_update_counter(beacon); 4578 4579 ieee80211_set_csa(sdata, beacon); 4580 } 4581 4582 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4583 local->hw.extra_beacon_tailroom); 4584 if (!skb) 4585 goto out; 4586 skb_reserve(skb, local->tx_headroom); 4587 skb_put_data(skb, beacon->head, beacon->head_len); 4588 4589 hdr = (struct ieee80211_hdr *) skb->data; 4590 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4591 IEEE80211_STYPE_BEACON); 4592 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4593 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4594 4595 beacon = rcu_dereference(ifmsh->beacon); 4596 if (!beacon) 4597 goto out; 4598 4599 if (beacon->csa_counter_offsets[0]) { 4600 if (!is_template) 4601 /* TODO: For mesh csa_counter is in TU, so 4602 * decrementing it by one isn't correct, but 4603 * for now we leave it consistent with overall 4604 * mac80211's behavior. 4605 */ 4606 __ieee80211_csa_update_counter(beacon); 4607 4608 ieee80211_set_csa(sdata, beacon); 4609 } 4610 4611 if (ifmsh->sync_ops) 4612 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4613 4614 skb = dev_alloc_skb(local->tx_headroom + 4615 beacon->head_len + 4616 256 + /* TIM IE */ 4617 beacon->tail_len + 4618 local->hw.extra_beacon_tailroom); 4619 if (!skb) 4620 goto out; 4621 skb_reserve(skb, local->tx_headroom); 4622 skb_put_data(skb, beacon->head, beacon->head_len); 4623 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4624 4625 if (offs) { 4626 offs->tim_offset = beacon->head_len; 4627 offs->tim_length = skb->len - beacon->head_len; 4628 } 4629 4630 skb_put_data(skb, beacon->tail, beacon->tail_len); 4631 } else { 4632 WARN_ON(1); 4633 goto out; 4634 } 4635 4636 /* CSA offsets */ 4637 if (offs && beacon) { 4638 int i; 4639 4640 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4641 u16 csa_off = beacon->csa_counter_offsets[i]; 4642 4643 if (!csa_off) 4644 continue; 4645 4646 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4647 } 4648 } 4649 4650 band = chanctx_conf->def.chan->band; 4651 4652 info = IEEE80211_SKB_CB(skb); 4653 4654 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4655 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4656 info->band = band; 4657 4658 memset(&txrc, 0, sizeof(txrc)); 4659 txrc.hw = hw; 4660 txrc.sband = local->hw.wiphy->bands[band]; 4661 txrc.bss_conf = &sdata->vif.bss_conf; 4662 txrc.skb = skb; 4663 txrc.reported_rate.idx = -1; 4664 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4665 txrc.bss = true; 4666 rate_control_get_rate(sdata, NULL, &txrc); 4667 4668 info->control.vif = vif; 4669 4670 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4671 IEEE80211_TX_CTL_ASSIGN_SEQ | 4672 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4673 out: 4674 rcu_read_unlock(); 4675 return skb; 4676 4677 } 4678 4679 struct sk_buff * 4680 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4681 struct ieee80211_vif *vif, 4682 struct ieee80211_mutable_offsets *offs) 4683 { 4684 return __ieee80211_beacon_get(hw, vif, offs, true); 4685 } 4686 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4687 4688 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4689 struct ieee80211_vif *vif, 4690 u16 *tim_offset, u16 *tim_length) 4691 { 4692 struct ieee80211_mutable_offsets offs = {}; 4693 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4694 struct sk_buff *copy; 4695 struct ieee80211_supported_band *sband; 4696 int shift; 4697 4698 if (!bcn) 4699 return bcn; 4700 4701 if (tim_offset) 4702 *tim_offset = offs.tim_offset; 4703 4704 if (tim_length) 4705 *tim_length = offs.tim_length; 4706 4707 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4708 !hw_to_local(hw)->monitors) 4709 return bcn; 4710 4711 /* send a copy to monitor interfaces */ 4712 copy = skb_copy(bcn, GFP_ATOMIC); 4713 if (!copy) 4714 return bcn; 4715 4716 shift = ieee80211_vif_get_shift(vif); 4717 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4718 if (!sband) 4719 return bcn; 4720 4721 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4722 NULL); 4723 4724 return bcn; 4725 } 4726 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4727 4728 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4729 struct ieee80211_vif *vif) 4730 { 4731 struct ieee80211_if_ap *ap = NULL; 4732 struct sk_buff *skb = NULL; 4733 struct probe_resp *presp = NULL; 4734 struct ieee80211_hdr *hdr; 4735 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4736 4737 if (sdata->vif.type != NL80211_IFTYPE_AP) 4738 return NULL; 4739 4740 rcu_read_lock(); 4741 4742 ap = &sdata->u.ap; 4743 presp = rcu_dereference(ap->probe_resp); 4744 if (!presp) 4745 goto out; 4746 4747 skb = dev_alloc_skb(presp->len); 4748 if (!skb) 4749 goto out; 4750 4751 skb_put_data(skb, presp->data, presp->len); 4752 4753 hdr = (struct ieee80211_hdr *) skb->data; 4754 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4755 4756 out: 4757 rcu_read_unlock(); 4758 return skb; 4759 } 4760 EXPORT_SYMBOL(ieee80211_proberesp_get); 4761 4762 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4763 struct ieee80211_vif *vif) 4764 { 4765 struct ieee80211_sub_if_data *sdata; 4766 struct ieee80211_if_managed *ifmgd; 4767 struct ieee80211_pspoll *pspoll; 4768 struct ieee80211_local *local; 4769 struct sk_buff *skb; 4770 4771 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4772 return NULL; 4773 4774 sdata = vif_to_sdata(vif); 4775 ifmgd = &sdata->u.mgd; 4776 local = sdata->local; 4777 4778 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4779 if (!skb) 4780 return NULL; 4781 4782 skb_reserve(skb, local->hw.extra_tx_headroom); 4783 4784 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4785 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4786 IEEE80211_STYPE_PSPOLL); 4787 pspoll->aid = cpu_to_le16(ifmgd->aid); 4788 4789 /* aid in PS-Poll has its two MSBs each set to 1 */ 4790 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4791 4792 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4793 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4794 4795 return skb; 4796 } 4797 EXPORT_SYMBOL(ieee80211_pspoll_get); 4798 4799 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4800 struct ieee80211_vif *vif, 4801 bool qos_ok) 4802 { 4803 struct ieee80211_hdr_3addr *nullfunc; 4804 struct ieee80211_sub_if_data *sdata; 4805 struct ieee80211_if_managed *ifmgd; 4806 struct ieee80211_local *local; 4807 struct sk_buff *skb; 4808 bool qos = false; 4809 4810 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4811 return NULL; 4812 4813 sdata = vif_to_sdata(vif); 4814 ifmgd = &sdata->u.mgd; 4815 local = sdata->local; 4816 4817 if (qos_ok) { 4818 struct sta_info *sta; 4819 4820 rcu_read_lock(); 4821 sta = sta_info_get(sdata, ifmgd->bssid); 4822 qos = sta && sta->sta.wme; 4823 rcu_read_unlock(); 4824 } 4825 4826 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4827 sizeof(*nullfunc) + 2); 4828 if (!skb) 4829 return NULL; 4830 4831 skb_reserve(skb, local->hw.extra_tx_headroom); 4832 4833 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4834 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4835 IEEE80211_STYPE_NULLFUNC | 4836 IEEE80211_FCTL_TODS); 4837 if (qos) { 4838 __le16 qoshdr = cpu_to_le16(7); 4839 4840 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4841 IEEE80211_STYPE_NULLFUNC) != 4842 IEEE80211_STYPE_QOS_NULLFUNC); 4843 nullfunc->frame_control |= 4844 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4845 skb->priority = 7; 4846 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4847 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 4848 } 4849 4850 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4851 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4852 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4853 4854 return skb; 4855 } 4856 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4857 4858 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4859 const u8 *src_addr, 4860 const u8 *ssid, size_t ssid_len, 4861 size_t tailroom) 4862 { 4863 struct ieee80211_local *local = hw_to_local(hw); 4864 struct ieee80211_hdr_3addr *hdr; 4865 struct sk_buff *skb; 4866 size_t ie_ssid_len; 4867 u8 *pos; 4868 4869 ie_ssid_len = 2 + ssid_len; 4870 4871 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4872 ie_ssid_len + tailroom); 4873 if (!skb) 4874 return NULL; 4875 4876 skb_reserve(skb, local->hw.extra_tx_headroom); 4877 4878 hdr = skb_put_zero(skb, sizeof(*hdr)); 4879 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4880 IEEE80211_STYPE_PROBE_REQ); 4881 eth_broadcast_addr(hdr->addr1); 4882 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4883 eth_broadcast_addr(hdr->addr3); 4884 4885 pos = skb_put(skb, ie_ssid_len); 4886 *pos++ = WLAN_EID_SSID; 4887 *pos++ = ssid_len; 4888 if (ssid_len) 4889 memcpy(pos, ssid, ssid_len); 4890 pos += ssid_len; 4891 4892 return skb; 4893 } 4894 EXPORT_SYMBOL(ieee80211_probereq_get); 4895 4896 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4897 const void *frame, size_t frame_len, 4898 const struct ieee80211_tx_info *frame_txctl, 4899 struct ieee80211_rts *rts) 4900 { 4901 const struct ieee80211_hdr *hdr = frame; 4902 4903 rts->frame_control = 4904 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4905 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4906 frame_txctl); 4907 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4908 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4909 } 4910 EXPORT_SYMBOL(ieee80211_rts_get); 4911 4912 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4913 const void *frame, size_t frame_len, 4914 const struct ieee80211_tx_info *frame_txctl, 4915 struct ieee80211_cts *cts) 4916 { 4917 const struct ieee80211_hdr *hdr = frame; 4918 4919 cts->frame_control = 4920 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4921 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4922 frame_len, frame_txctl); 4923 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4924 } 4925 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4926 4927 struct sk_buff * 4928 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4929 struct ieee80211_vif *vif) 4930 { 4931 struct ieee80211_local *local = hw_to_local(hw); 4932 struct sk_buff *skb = NULL; 4933 struct ieee80211_tx_data tx; 4934 struct ieee80211_sub_if_data *sdata; 4935 struct ps_data *ps; 4936 struct ieee80211_tx_info *info; 4937 struct ieee80211_chanctx_conf *chanctx_conf; 4938 4939 sdata = vif_to_sdata(vif); 4940 4941 rcu_read_lock(); 4942 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4943 4944 if (!chanctx_conf) 4945 goto out; 4946 4947 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4948 struct beacon_data *beacon = 4949 rcu_dereference(sdata->u.ap.beacon); 4950 4951 if (!beacon || !beacon->head) 4952 goto out; 4953 4954 ps = &sdata->u.ap.ps; 4955 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4956 ps = &sdata->u.mesh.ps; 4957 } else { 4958 goto out; 4959 } 4960 4961 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4962 goto out; /* send buffered bc/mc only after DTIM beacon */ 4963 4964 while (1) { 4965 skb = skb_dequeue(&ps->bc_buf); 4966 if (!skb) 4967 goto out; 4968 local->total_ps_buffered--; 4969 4970 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4971 struct ieee80211_hdr *hdr = 4972 (struct ieee80211_hdr *) skb->data; 4973 /* more buffered multicast/broadcast frames ==> set 4974 * MoreData flag in IEEE 802.11 header to inform PS 4975 * STAs */ 4976 hdr->frame_control |= 4977 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4978 } 4979 4980 if (sdata->vif.type == NL80211_IFTYPE_AP) 4981 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4982 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4983 break; 4984 ieee80211_free_txskb(hw, skb); 4985 } 4986 4987 info = IEEE80211_SKB_CB(skb); 4988 4989 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4990 info->band = chanctx_conf->def.chan->band; 4991 4992 if (invoke_tx_handlers(&tx)) 4993 skb = NULL; 4994 out: 4995 rcu_read_unlock(); 4996 4997 return skb; 4998 } 4999 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5000 5001 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5002 { 5003 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5004 struct ieee80211_sub_if_data *sdata = sta->sdata; 5005 struct ieee80211_local *local = sdata->local; 5006 int ret; 5007 u32 queues; 5008 5009 lockdep_assert_held(&local->sta_mtx); 5010 5011 /* only some cases are supported right now */ 5012 switch (sdata->vif.type) { 5013 case NL80211_IFTYPE_STATION: 5014 case NL80211_IFTYPE_AP: 5015 case NL80211_IFTYPE_AP_VLAN: 5016 break; 5017 default: 5018 WARN_ON(1); 5019 return -EINVAL; 5020 } 5021 5022 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5023 return -EINVAL; 5024 5025 if (sta->reserved_tid == tid) { 5026 ret = 0; 5027 goto out; 5028 } 5029 5030 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5031 sdata_err(sdata, "TID reservation already active\n"); 5032 ret = -EALREADY; 5033 goto out; 5034 } 5035 5036 ieee80211_stop_vif_queues(sdata->local, sdata, 5037 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5038 5039 synchronize_net(); 5040 5041 /* Tear down BA sessions so we stop aggregating on this TID */ 5042 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5043 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5044 __ieee80211_stop_tx_ba_session(sta, tid, 5045 AGG_STOP_LOCAL_REQUEST); 5046 } 5047 5048 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5049 __ieee80211_flush_queues(local, sdata, queues, false); 5050 5051 sta->reserved_tid = tid; 5052 5053 ieee80211_wake_vif_queues(local, sdata, 5054 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5055 5056 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5057 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5058 5059 ret = 0; 5060 out: 5061 return ret; 5062 } 5063 EXPORT_SYMBOL(ieee80211_reserve_tid); 5064 5065 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5066 { 5067 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5068 struct ieee80211_sub_if_data *sdata = sta->sdata; 5069 5070 lockdep_assert_held(&sdata->local->sta_mtx); 5071 5072 /* only some cases are supported right now */ 5073 switch (sdata->vif.type) { 5074 case NL80211_IFTYPE_STATION: 5075 case NL80211_IFTYPE_AP: 5076 case NL80211_IFTYPE_AP_VLAN: 5077 break; 5078 default: 5079 WARN_ON(1); 5080 return; 5081 } 5082 5083 if (tid != sta->reserved_tid) { 5084 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5085 return; 5086 } 5087 5088 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5089 } 5090 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5091 5092 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5093 struct sk_buff *skb, int tid, 5094 enum nl80211_band band, u32 txdata_flags) 5095 { 5096 int ac = ieee80211_ac_from_tid(tid); 5097 5098 skb_reset_mac_header(skb); 5099 skb_set_queue_mapping(skb, ac); 5100 skb->priority = tid; 5101 5102 skb->dev = sdata->dev; 5103 5104 /* 5105 * The other path calling ieee80211_xmit is from the tasklet, 5106 * and while we can handle concurrent transmissions locking 5107 * requirements are that we do not come into tx with bhs on. 5108 */ 5109 local_bh_disable(); 5110 IEEE80211_SKB_CB(skb)->band = band; 5111 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 5112 local_bh_enable(); 5113 } 5114 5115 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5116 const u8 *buf, size_t len, 5117 const u8 *dest, __be16 proto, bool unencrypted) 5118 { 5119 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5120 struct ieee80211_local *local = sdata->local; 5121 struct sk_buff *skb; 5122 struct ethhdr *ehdr; 5123 u32 flags; 5124 5125 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5126 * or Pre-Authentication 5127 */ 5128 if (proto != sdata->control_port_protocol && 5129 proto != cpu_to_be16(ETH_P_PREAUTH)) 5130 return -EINVAL; 5131 5132 if (unencrypted) 5133 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 5134 else 5135 flags = 0; 5136 5137 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5138 sizeof(struct ethhdr) + len); 5139 if (!skb) 5140 return -ENOMEM; 5141 5142 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5143 5144 skb_put_data(skb, buf, len); 5145 5146 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5147 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5148 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5149 ehdr->h_proto = proto; 5150 5151 skb->dev = dev; 5152 skb->protocol = htons(ETH_P_802_3); 5153 skb_reset_network_header(skb); 5154 skb_reset_mac_header(skb); 5155 5156 local_bh_disable(); 5157 __ieee80211_subif_start_xmit(skb, skb->dev, flags, 0); 5158 local_bh_enable(); 5159 5160 return 0; 5161 } 5162 5163 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5164 const u8 *buf, size_t len) 5165 { 5166 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5167 struct ieee80211_local *local = sdata->local; 5168 struct sk_buff *skb; 5169 5170 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5171 30 + /* header size */ 5172 18); /* 11s header size */ 5173 if (!skb) 5174 return -ENOMEM; 5175 5176 skb_reserve(skb, local->hw.extra_tx_headroom); 5177 skb_put_data(skb, buf, len); 5178 5179 skb->dev = dev; 5180 skb->protocol = htons(ETH_P_802_3); 5181 skb_reset_network_header(skb); 5182 skb_reset_mac_header(skb); 5183 5184 local_bh_disable(); 5185 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5186 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP); 5187 local_bh_enable(); 5188 5189 return 0; 5190 } 5191