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 (!(info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) && 1254 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1255 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1256 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1257 vif->type == NL80211_IFTYPE_STATION) && 1258 sta && sta->uploaded) { 1259 /* 1260 * This will be NULL if the driver didn't set the 1261 * opt-in hardware flag. 1262 */ 1263 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1264 } 1265 } else if (sta) { 1266 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1267 1268 if (!sta->uploaded) 1269 return NULL; 1270 1271 txq = sta->sta.txq[tid]; 1272 } else if (vif) { 1273 txq = vif->txq; 1274 } 1275 1276 if (!txq) 1277 return NULL; 1278 1279 return to_txq_info(txq); 1280 } 1281 1282 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1283 { 1284 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1285 } 1286 1287 static u32 codel_skb_len_func(const struct sk_buff *skb) 1288 { 1289 return skb->len; 1290 } 1291 1292 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1293 { 1294 const struct ieee80211_tx_info *info; 1295 1296 info = (const struct ieee80211_tx_info *)skb->cb; 1297 return info->control.enqueue_time; 1298 } 1299 1300 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1301 void *ctx) 1302 { 1303 struct ieee80211_local *local; 1304 struct txq_info *txqi; 1305 struct fq *fq; 1306 struct fq_flow *flow; 1307 1308 txqi = ctx; 1309 local = vif_to_sdata(txqi->txq.vif)->local; 1310 fq = &local->fq; 1311 1312 if (cvars == &txqi->def_cvars) 1313 flow = &txqi->def_flow; 1314 else 1315 flow = &fq->flows[cvars - local->cvars]; 1316 1317 return fq_flow_dequeue(fq, flow); 1318 } 1319 1320 static void codel_drop_func(struct sk_buff *skb, 1321 void *ctx) 1322 { 1323 struct ieee80211_local *local; 1324 struct ieee80211_hw *hw; 1325 struct txq_info *txqi; 1326 1327 txqi = ctx; 1328 local = vif_to_sdata(txqi->txq.vif)->local; 1329 hw = &local->hw; 1330 1331 ieee80211_free_txskb(hw, skb); 1332 } 1333 1334 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1335 struct fq_tin *tin, 1336 struct fq_flow *flow) 1337 { 1338 struct ieee80211_local *local; 1339 struct txq_info *txqi; 1340 struct codel_vars *cvars; 1341 struct codel_params *cparams; 1342 struct codel_stats *cstats; 1343 1344 local = container_of(fq, struct ieee80211_local, fq); 1345 txqi = container_of(tin, struct txq_info, tin); 1346 cstats = &txqi->cstats; 1347 1348 if (txqi->txq.sta) { 1349 struct sta_info *sta = container_of(txqi->txq.sta, 1350 struct sta_info, sta); 1351 cparams = &sta->cparams; 1352 } else { 1353 cparams = &local->cparams; 1354 } 1355 1356 if (flow == &txqi->def_flow) 1357 cvars = &txqi->def_cvars; 1358 else 1359 cvars = &local->cvars[flow - fq->flows]; 1360 1361 return codel_dequeue(txqi, 1362 &flow->backlog, 1363 cparams, 1364 cvars, 1365 cstats, 1366 codel_skb_len_func, 1367 codel_skb_time_func, 1368 codel_drop_func, 1369 codel_dequeue_func); 1370 } 1371 1372 static void fq_skb_free_func(struct fq *fq, 1373 struct fq_tin *tin, 1374 struct fq_flow *flow, 1375 struct sk_buff *skb) 1376 { 1377 struct ieee80211_local *local; 1378 1379 local = container_of(fq, struct ieee80211_local, fq); 1380 ieee80211_free_txskb(&local->hw, skb); 1381 } 1382 1383 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1384 struct fq_tin *tin, 1385 int idx, 1386 struct sk_buff *skb) 1387 { 1388 struct txq_info *txqi; 1389 1390 txqi = container_of(tin, struct txq_info, tin); 1391 return &txqi->def_flow; 1392 } 1393 1394 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1395 struct txq_info *txqi, 1396 struct sk_buff *skb) 1397 { 1398 struct fq *fq = &local->fq; 1399 struct fq_tin *tin = &txqi->tin; 1400 u32 flow_idx = fq_flow_idx(fq, skb); 1401 1402 ieee80211_set_skb_enqueue_time(skb); 1403 1404 spin_lock_bh(&fq->lock); 1405 fq_tin_enqueue(fq, tin, flow_idx, skb, 1406 fq_skb_free_func, 1407 fq_flow_get_default_func); 1408 spin_unlock_bh(&fq->lock); 1409 } 1410 1411 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1412 struct fq_flow *flow, struct sk_buff *skb, 1413 void *data) 1414 { 1415 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1416 1417 return info->control.vif == data; 1418 } 1419 1420 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1421 struct ieee80211_sub_if_data *sdata) 1422 { 1423 struct fq *fq = &local->fq; 1424 struct txq_info *txqi; 1425 struct fq_tin *tin; 1426 struct ieee80211_sub_if_data *ap; 1427 1428 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1429 return; 1430 1431 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1432 1433 if (!ap->vif.txq) 1434 return; 1435 1436 txqi = to_txq_info(ap->vif.txq); 1437 tin = &txqi->tin; 1438 1439 spin_lock_bh(&fq->lock); 1440 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1441 fq_skb_free_func); 1442 spin_unlock_bh(&fq->lock); 1443 } 1444 1445 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1446 struct sta_info *sta, 1447 struct txq_info *txqi, int tid) 1448 { 1449 fq_tin_init(&txqi->tin); 1450 fq_flow_init(&txqi->def_flow); 1451 codel_vars_init(&txqi->def_cvars); 1452 codel_stats_init(&txqi->cstats); 1453 __skb_queue_head_init(&txqi->frags); 1454 INIT_LIST_HEAD(&txqi->schedule_order); 1455 1456 txqi->txq.vif = &sdata->vif; 1457 1458 if (!sta) { 1459 sdata->vif.txq = &txqi->txq; 1460 txqi->txq.tid = 0; 1461 txqi->txq.ac = IEEE80211_AC_BE; 1462 1463 return; 1464 } 1465 1466 if (tid == IEEE80211_NUM_TIDS) { 1467 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1468 /* Drivers need to opt in to the management MPDU TXQ */ 1469 if (!ieee80211_hw_check(&sdata->local->hw, 1470 STA_MMPDU_TXQ)) 1471 return; 1472 } else if (!ieee80211_hw_check(&sdata->local->hw, 1473 BUFF_MMPDU_TXQ)) { 1474 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1475 return; 1476 } 1477 txqi->txq.ac = IEEE80211_AC_VO; 1478 } else { 1479 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1480 } 1481 1482 txqi->txq.sta = &sta->sta; 1483 txqi->txq.tid = tid; 1484 sta->sta.txq[tid] = &txqi->txq; 1485 } 1486 1487 void ieee80211_txq_purge(struct ieee80211_local *local, 1488 struct txq_info *txqi) 1489 { 1490 struct fq *fq = &local->fq; 1491 struct fq_tin *tin = &txqi->tin; 1492 1493 spin_lock_bh(&fq->lock); 1494 fq_tin_reset(fq, tin, fq_skb_free_func); 1495 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1496 spin_unlock_bh(&fq->lock); 1497 1498 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1499 list_del_init(&txqi->schedule_order); 1500 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1501 } 1502 1503 void ieee80211_txq_set_params(struct ieee80211_local *local) 1504 { 1505 if (local->hw.wiphy->txq_limit) 1506 local->fq.limit = local->hw.wiphy->txq_limit; 1507 else 1508 local->hw.wiphy->txq_limit = local->fq.limit; 1509 1510 if (local->hw.wiphy->txq_memory_limit) 1511 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1512 else 1513 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1514 1515 if (local->hw.wiphy->txq_quantum) 1516 local->fq.quantum = local->hw.wiphy->txq_quantum; 1517 else 1518 local->hw.wiphy->txq_quantum = local->fq.quantum; 1519 } 1520 1521 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1522 { 1523 struct fq *fq = &local->fq; 1524 int ret; 1525 int i; 1526 bool supp_vht = false; 1527 enum nl80211_band band; 1528 1529 if (!local->ops->wake_tx_queue) 1530 return 0; 1531 1532 ret = fq_init(fq, 4096); 1533 if (ret) 1534 return ret; 1535 1536 /* 1537 * If the hardware doesn't support VHT, it is safe to limit the maximum 1538 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1539 */ 1540 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1541 struct ieee80211_supported_band *sband; 1542 1543 sband = local->hw.wiphy->bands[band]; 1544 if (!sband) 1545 continue; 1546 1547 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1548 } 1549 1550 if (!supp_vht) 1551 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1552 1553 codel_params_init(&local->cparams); 1554 local->cparams.interval = MS2TIME(100); 1555 local->cparams.target = MS2TIME(20); 1556 local->cparams.ecn = true; 1557 1558 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1559 GFP_KERNEL); 1560 if (!local->cvars) { 1561 spin_lock_bh(&fq->lock); 1562 fq_reset(fq, fq_skb_free_func); 1563 spin_unlock_bh(&fq->lock); 1564 return -ENOMEM; 1565 } 1566 1567 for (i = 0; i < fq->flows_cnt; i++) 1568 codel_vars_init(&local->cvars[i]); 1569 1570 ieee80211_txq_set_params(local); 1571 1572 return 0; 1573 } 1574 1575 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1576 { 1577 struct fq *fq = &local->fq; 1578 1579 if (!local->ops->wake_tx_queue) 1580 return; 1581 1582 kfree(local->cvars); 1583 local->cvars = NULL; 1584 1585 spin_lock_bh(&fq->lock); 1586 fq_reset(fq, fq_skb_free_func); 1587 spin_unlock_bh(&fq->lock); 1588 } 1589 1590 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1591 struct ieee80211_sub_if_data *sdata, 1592 struct sta_info *sta, 1593 struct sk_buff *skb) 1594 { 1595 struct ieee80211_vif *vif; 1596 struct txq_info *txqi; 1597 1598 if (!local->ops->wake_tx_queue || 1599 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1600 return false; 1601 1602 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1603 sdata = container_of(sdata->bss, 1604 struct ieee80211_sub_if_data, u.ap); 1605 1606 vif = &sdata->vif; 1607 txqi = ieee80211_get_txq(local, vif, sta, skb); 1608 1609 if (!txqi) 1610 return false; 1611 1612 ieee80211_txq_enqueue(local, txqi, skb); 1613 1614 schedule_and_wake_txq(local, txqi); 1615 1616 return true; 1617 } 1618 1619 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1620 struct ieee80211_vif *vif, 1621 struct sta_info *sta, 1622 struct sk_buff_head *skbs, 1623 bool txpending) 1624 { 1625 struct ieee80211_tx_control control = {}; 1626 struct sk_buff *skb, *tmp; 1627 unsigned long flags; 1628 1629 skb_queue_walk_safe(skbs, skb, tmp) { 1630 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1631 int q = info->hw_queue; 1632 1633 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1634 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1635 __skb_unlink(skb, skbs); 1636 ieee80211_free_txskb(&local->hw, skb); 1637 continue; 1638 } 1639 #endif 1640 1641 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1642 if (local->queue_stop_reasons[q] || 1643 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1644 if (unlikely(info->flags & 1645 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1646 if (local->queue_stop_reasons[q] & 1647 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1648 /* 1649 * Drop off-channel frames if queues 1650 * are stopped for any reason other 1651 * than off-channel operation. Never 1652 * queue them. 1653 */ 1654 spin_unlock_irqrestore( 1655 &local->queue_stop_reason_lock, 1656 flags); 1657 ieee80211_purge_tx_queue(&local->hw, 1658 skbs); 1659 return true; 1660 } 1661 } else { 1662 1663 /* 1664 * Since queue is stopped, queue up frames for 1665 * later transmission from the tx-pending 1666 * tasklet when the queue is woken again. 1667 */ 1668 if (txpending) 1669 skb_queue_splice_init(skbs, 1670 &local->pending[q]); 1671 else 1672 skb_queue_splice_tail_init(skbs, 1673 &local->pending[q]); 1674 1675 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1676 flags); 1677 return false; 1678 } 1679 } 1680 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1681 1682 info->control.vif = vif; 1683 control.sta = sta ? &sta->sta : NULL; 1684 1685 __skb_unlink(skb, skbs); 1686 drv_tx(local, &control, skb); 1687 } 1688 1689 return true; 1690 } 1691 1692 /* 1693 * Returns false if the frame couldn't be transmitted but was queued instead. 1694 */ 1695 static bool __ieee80211_tx(struct ieee80211_local *local, 1696 struct sk_buff_head *skbs, int led_len, 1697 struct sta_info *sta, bool txpending) 1698 { 1699 struct ieee80211_tx_info *info; 1700 struct ieee80211_sub_if_data *sdata; 1701 struct ieee80211_vif *vif; 1702 struct sk_buff *skb; 1703 bool result = true; 1704 __le16 fc; 1705 1706 if (WARN_ON(skb_queue_empty(skbs))) 1707 return true; 1708 1709 skb = skb_peek(skbs); 1710 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1711 info = IEEE80211_SKB_CB(skb); 1712 sdata = vif_to_sdata(info->control.vif); 1713 if (sta && !sta->uploaded) 1714 sta = NULL; 1715 1716 switch (sdata->vif.type) { 1717 case NL80211_IFTYPE_MONITOR: 1718 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1719 vif = &sdata->vif; 1720 break; 1721 } 1722 sdata = rcu_dereference(local->monitor_sdata); 1723 if (sdata) { 1724 vif = &sdata->vif; 1725 info->hw_queue = 1726 vif->hw_queue[skb_get_queue_mapping(skb)]; 1727 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1728 ieee80211_purge_tx_queue(&local->hw, skbs); 1729 return true; 1730 } else 1731 vif = NULL; 1732 break; 1733 case NL80211_IFTYPE_AP_VLAN: 1734 sdata = container_of(sdata->bss, 1735 struct ieee80211_sub_if_data, u.ap); 1736 /* fall through */ 1737 default: 1738 vif = &sdata->vif; 1739 break; 1740 } 1741 1742 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1743 1744 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1745 1746 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1747 1748 return result; 1749 } 1750 1751 /* 1752 * Invoke TX handlers, return 0 on success and non-zero if the 1753 * frame was dropped or queued. 1754 * 1755 * The handlers are split into an early and late part. The latter is everything 1756 * that can be sensitive to reordering, and will be deferred to after packets 1757 * are dequeued from the intermediate queues (when they are enabled). 1758 */ 1759 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1760 { 1761 ieee80211_tx_result res = TX_DROP; 1762 1763 #define CALL_TXH(txh) \ 1764 do { \ 1765 res = txh(tx); \ 1766 if (res != TX_CONTINUE) \ 1767 goto txh_done; \ 1768 } while (0) 1769 1770 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1771 CALL_TXH(ieee80211_tx_h_check_assoc); 1772 CALL_TXH(ieee80211_tx_h_ps_buf); 1773 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1774 CALL_TXH(ieee80211_tx_h_select_key); 1775 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1776 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1777 1778 txh_done: 1779 if (unlikely(res == TX_DROP)) { 1780 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1781 if (tx->skb) 1782 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1783 else 1784 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1785 return -1; 1786 } else if (unlikely(res == TX_QUEUED)) { 1787 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1788 return -1; 1789 } 1790 1791 return 0; 1792 } 1793 1794 /* 1795 * Late handlers can be called while the sta lock is held. Handlers that can 1796 * cause packets to be generated will cause deadlock! 1797 */ 1798 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1799 { 1800 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1801 ieee80211_tx_result res = TX_CONTINUE; 1802 1803 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1804 __skb_queue_tail(&tx->skbs, tx->skb); 1805 tx->skb = NULL; 1806 goto txh_done; 1807 } 1808 1809 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1810 CALL_TXH(ieee80211_tx_h_sequence); 1811 CALL_TXH(ieee80211_tx_h_fragment); 1812 /* handlers after fragment must be aware of tx info fragmentation! */ 1813 CALL_TXH(ieee80211_tx_h_stats); 1814 CALL_TXH(ieee80211_tx_h_encrypt); 1815 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1816 CALL_TXH(ieee80211_tx_h_calculate_duration); 1817 #undef CALL_TXH 1818 1819 txh_done: 1820 if (unlikely(res == TX_DROP)) { 1821 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1822 if (tx->skb) 1823 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1824 else 1825 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1826 return -1; 1827 } else if (unlikely(res == TX_QUEUED)) { 1828 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1829 return -1; 1830 } 1831 1832 return 0; 1833 } 1834 1835 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1836 { 1837 int r = invoke_tx_handlers_early(tx); 1838 1839 if (r) 1840 return r; 1841 return invoke_tx_handlers_late(tx); 1842 } 1843 1844 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1845 struct ieee80211_vif *vif, struct sk_buff *skb, 1846 int band, struct ieee80211_sta **sta) 1847 { 1848 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1849 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1850 struct ieee80211_tx_data tx; 1851 struct sk_buff *skb2; 1852 1853 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1854 return false; 1855 1856 info->band = band; 1857 info->control.vif = vif; 1858 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1859 1860 if (invoke_tx_handlers(&tx)) 1861 return false; 1862 1863 if (sta) { 1864 if (tx.sta) 1865 *sta = &tx.sta->sta; 1866 else 1867 *sta = NULL; 1868 } 1869 1870 /* this function isn't suitable for fragmented data frames */ 1871 skb2 = __skb_dequeue(&tx.skbs); 1872 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1873 ieee80211_free_txskb(hw, skb2); 1874 ieee80211_purge_tx_queue(hw, &tx.skbs); 1875 return false; 1876 } 1877 1878 return true; 1879 } 1880 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1881 1882 /* 1883 * Returns false if the frame couldn't be transmitted but was queued instead. 1884 */ 1885 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1886 struct sta_info *sta, struct sk_buff *skb, 1887 bool txpending, u32 txdata_flags) 1888 { 1889 struct ieee80211_local *local = sdata->local; 1890 struct ieee80211_tx_data tx; 1891 ieee80211_tx_result res_prepare; 1892 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1893 bool result = true; 1894 int led_len; 1895 1896 if (unlikely(skb->len < 10)) { 1897 dev_kfree_skb(skb); 1898 return true; 1899 } 1900 1901 /* initialises tx */ 1902 led_len = skb->len; 1903 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1904 1905 tx.flags |= txdata_flags; 1906 1907 if (unlikely(res_prepare == TX_DROP)) { 1908 ieee80211_free_txskb(&local->hw, skb); 1909 return true; 1910 } else if (unlikely(res_prepare == TX_QUEUED)) { 1911 return true; 1912 } 1913 1914 /* set up hw_queue value early */ 1915 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1916 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1917 info->hw_queue = 1918 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1919 1920 if (invoke_tx_handlers_early(&tx)) 1921 return true; 1922 1923 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1924 return true; 1925 1926 if (!invoke_tx_handlers_late(&tx)) 1927 result = __ieee80211_tx(local, &tx.skbs, led_len, 1928 tx.sta, txpending); 1929 1930 return result; 1931 } 1932 1933 /* device xmit handlers */ 1934 1935 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1936 struct sk_buff *skb, 1937 int head_need, bool may_encrypt) 1938 { 1939 struct ieee80211_local *local = sdata->local; 1940 struct ieee80211_hdr *hdr; 1941 bool enc_tailroom; 1942 int tail_need = 0; 1943 1944 hdr = (struct ieee80211_hdr *) skb->data; 1945 enc_tailroom = may_encrypt && 1946 (sdata->crypto_tx_tailroom_needed_cnt || 1947 ieee80211_is_mgmt(hdr->frame_control)); 1948 1949 if (enc_tailroom) { 1950 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1951 tail_need -= skb_tailroom(skb); 1952 tail_need = max_t(int, tail_need, 0); 1953 } 1954 1955 if (skb_cloned(skb) && 1956 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1957 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1958 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1959 else if (head_need || tail_need) 1960 I802_DEBUG_INC(local->tx_expand_skb_head); 1961 else 1962 return 0; 1963 1964 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1965 wiphy_debug(local->hw.wiphy, 1966 "failed to reallocate TX buffer\n"); 1967 return -ENOMEM; 1968 } 1969 1970 return 0; 1971 } 1972 1973 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1974 struct sta_info *sta, struct sk_buff *skb, 1975 u32 txdata_flags) 1976 { 1977 struct ieee80211_local *local = sdata->local; 1978 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1979 struct ieee80211_hdr *hdr; 1980 int headroom; 1981 bool may_encrypt; 1982 1983 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1984 1985 headroom = local->tx_headroom; 1986 if (may_encrypt) 1987 headroom += sdata->encrypt_headroom; 1988 headroom -= skb_headroom(skb); 1989 headroom = max_t(int, 0, headroom); 1990 1991 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1992 ieee80211_free_txskb(&local->hw, skb); 1993 return; 1994 } 1995 1996 hdr = (struct ieee80211_hdr *) skb->data; 1997 info->control.vif = &sdata->vif; 1998 1999 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2000 if (ieee80211_is_data(hdr->frame_control) && 2001 is_unicast_ether_addr(hdr->addr1)) { 2002 if (mesh_nexthop_resolve(sdata, skb)) 2003 return; /* skb queued: don't free */ 2004 } else { 2005 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2006 } 2007 } 2008 2009 ieee80211_set_qos_hdr(sdata, skb); 2010 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 2011 } 2012 2013 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 2014 struct sk_buff *skb) 2015 { 2016 struct ieee80211_radiotap_iterator iterator; 2017 struct ieee80211_radiotap_header *rthdr = 2018 (struct ieee80211_radiotap_header *) skb->data; 2019 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2020 struct ieee80211_supported_band *sband = 2021 local->hw.wiphy->bands[info->band]; 2022 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2023 NULL); 2024 u16 txflags; 2025 u16 rate = 0; 2026 bool rate_found = false; 2027 u8 rate_retries = 0; 2028 u16 rate_flags = 0; 2029 u8 mcs_known, mcs_flags, mcs_bw; 2030 u16 vht_known; 2031 u8 vht_mcs = 0, vht_nss = 0; 2032 int i; 2033 2034 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2035 IEEE80211_TX_CTL_DONTFRAG; 2036 2037 /* 2038 * for every radiotap entry that is present 2039 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2040 * entries present, or -EINVAL on error) 2041 */ 2042 2043 while (!ret) { 2044 ret = ieee80211_radiotap_iterator_next(&iterator); 2045 2046 if (ret) 2047 continue; 2048 2049 /* see if this argument is something we can use */ 2050 switch (iterator.this_arg_index) { 2051 /* 2052 * You must take care when dereferencing iterator.this_arg 2053 * for multibyte types... the pointer is not aligned. Use 2054 * get_unaligned((type *)iterator.this_arg) to dereference 2055 * iterator.this_arg for type "type" safely on all arches. 2056 */ 2057 case IEEE80211_RADIOTAP_FLAGS: 2058 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2059 /* 2060 * this indicates that the skb we have been 2061 * handed has the 32-bit FCS CRC at the end... 2062 * we should react to that by snipping it off 2063 * because it will be recomputed and added 2064 * on transmission 2065 */ 2066 if (skb->len < (iterator._max_length + FCS_LEN)) 2067 return false; 2068 2069 skb_trim(skb, skb->len - FCS_LEN); 2070 } 2071 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2072 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2073 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2074 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2075 break; 2076 2077 case IEEE80211_RADIOTAP_TX_FLAGS: 2078 txflags = get_unaligned_le16(iterator.this_arg); 2079 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2080 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2081 break; 2082 2083 case IEEE80211_RADIOTAP_RATE: 2084 rate = *iterator.this_arg; 2085 rate_flags = 0; 2086 rate_found = true; 2087 break; 2088 2089 case IEEE80211_RADIOTAP_DATA_RETRIES: 2090 rate_retries = *iterator.this_arg; 2091 break; 2092 2093 case IEEE80211_RADIOTAP_MCS: 2094 mcs_known = iterator.this_arg[0]; 2095 mcs_flags = iterator.this_arg[1]; 2096 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2097 break; 2098 2099 rate_found = true; 2100 rate = iterator.this_arg[2]; 2101 rate_flags = IEEE80211_TX_RC_MCS; 2102 2103 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2104 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2105 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2106 2107 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2108 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2109 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2110 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2111 break; 2112 2113 case IEEE80211_RADIOTAP_VHT: 2114 vht_known = get_unaligned_le16(iterator.this_arg); 2115 rate_found = true; 2116 2117 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2118 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2119 (iterator.this_arg[2] & 2120 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2121 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2122 if (vht_known & 2123 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2124 if (iterator.this_arg[3] == 1) 2125 rate_flags |= 2126 IEEE80211_TX_RC_40_MHZ_WIDTH; 2127 else if (iterator.this_arg[3] == 4) 2128 rate_flags |= 2129 IEEE80211_TX_RC_80_MHZ_WIDTH; 2130 else if (iterator.this_arg[3] == 11) 2131 rate_flags |= 2132 IEEE80211_TX_RC_160_MHZ_WIDTH; 2133 } 2134 2135 vht_mcs = iterator.this_arg[4] >> 4; 2136 vht_nss = iterator.this_arg[4] & 0xF; 2137 break; 2138 2139 /* 2140 * Please update the file 2141 * Documentation/networking/mac80211-injection.txt 2142 * when parsing new fields here. 2143 */ 2144 2145 default: 2146 break; 2147 } 2148 } 2149 2150 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2151 return false; 2152 2153 if (rate_found) { 2154 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2155 2156 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2157 info->control.rates[i].idx = -1; 2158 info->control.rates[i].flags = 0; 2159 info->control.rates[i].count = 0; 2160 } 2161 2162 if (rate_flags & IEEE80211_TX_RC_MCS) { 2163 info->control.rates[0].idx = rate; 2164 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2165 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2166 vht_nss); 2167 } else { 2168 for (i = 0; i < sband->n_bitrates; i++) { 2169 if (rate * 5 != sband->bitrates[i].bitrate) 2170 continue; 2171 2172 info->control.rates[0].idx = i; 2173 break; 2174 } 2175 } 2176 2177 if (info->control.rates[0].idx < 0) 2178 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2179 2180 info->control.rates[0].flags = rate_flags; 2181 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2182 local->hw.max_rate_tries); 2183 } 2184 2185 /* 2186 * remove the radiotap header 2187 * iterator->_max_length was sanity-checked against 2188 * skb->len by iterator init 2189 */ 2190 skb_pull(skb, iterator._max_length); 2191 2192 return true; 2193 } 2194 2195 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2196 struct net_device *dev) 2197 { 2198 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2199 struct ieee80211_chanctx_conf *chanctx_conf; 2200 struct ieee80211_radiotap_header *prthdr = 2201 (struct ieee80211_radiotap_header *)skb->data; 2202 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2203 struct ieee80211_hdr *hdr; 2204 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2205 struct cfg80211_chan_def *chandef; 2206 u16 len_rthdr; 2207 int hdrlen; 2208 2209 /* check for not even having the fixed radiotap header part */ 2210 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2211 goto fail; /* too short to be possibly valid */ 2212 2213 /* is it a header version we can trust to find length from? */ 2214 if (unlikely(prthdr->it_version)) 2215 goto fail; /* only version 0 is supported */ 2216 2217 /* then there must be a radiotap header with a length we can use */ 2218 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2219 2220 /* does the skb contain enough to deliver on the alleged length? */ 2221 if (unlikely(skb->len < len_rthdr)) 2222 goto fail; /* skb too short for claimed rt header extent */ 2223 2224 /* 2225 * fix up the pointers accounting for the radiotap 2226 * header still being in there. We are being given 2227 * a precooked IEEE80211 header so no need for 2228 * normal processing 2229 */ 2230 skb_set_mac_header(skb, len_rthdr); 2231 /* 2232 * these are just fixed to the end of the rt area since we 2233 * don't have any better information and at this point, nobody cares 2234 */ 2235 skb_set_network_header(skb, len_rthdr); 2236 skb_set_transport_header(skb, len_rthdr); 2237 2238 if (skb->len < len_rthdr + 2) 2239 goto fail; 2240 2241 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2242 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2243 2244 if (skb->len < len_rthdr + hdrlen) 2245 goto fail; 2246 2247 /* 2248 * Initialize skb->protocol if the injected frame is a data frame 2249 * carrying a rfc1042 header 2250 */ 2251 if (ieee80211_is_data(hdr->frame_control) && 2252 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2253 u8 *payload = (u8 *)hdr + hdrlen; 2254 2255 if (ether_addr_equal(payload, rfc1042_header)) 2256 skb->protocol = cpu_to_be16((payload[6] << 8) | 2257 payload[7]); 2258 } 2259 2260 memset(info, 0, sizeof(*info)); 2261 2262 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2263 IEEE80211_TX_CTL_INJECTED; 2264 2265 rcu_read_lock(); 2266 2267 /* 2268 * We process outgoing injected frames that have a local address 2269 * we handle as though they are non-injected frames. 2270 * This code here isn't entirely correct, the local MAC address 2271 * isn't always enough to find the interface to use; for proper 2272 * VLAN/WDS support we will need a different mechanism (which 2273 * likely isn't going to be monitor interfaces). 2274 * 2275 * This is necessary, for example, for old hostapd versions that 2276 * don't use nl80211-based management TX/RX. 2277 */ 2278 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2279 2280 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2281 if (!ieee80211_sdata_running(tmp_sdata)) 2282 continue; 2283 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2284 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2285 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2286 continue; 2287 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2288 sdata = tmp_sdata; 2289 break; 2290 } 2291 } 2292 2293 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2294 if (!chanctx_conf) { 2295 tmp_sdata = rcu_dereference(local->monitor_sdata); 2296 if (tmp_sdata) 2297 chanctx_conf = 2298 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2299 } 2300 2301 if (chanctx_conf) 2302 chandef = &chanctx_conf->def; 2303 else if (!local->use_chanctx) 2304 chandef = &local->_oper_chandef; 2305 else 2306 goto fail_rcu; 2307 2308 /* 2309 * Frame injection is not allowed if beaconing is not allowed 2310 * or if we need radar detection. Beaconing is usually not allowed when 2311 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2312 * Passive scan is also used in world regulatory domains where 2313 * your country is not known and as such it should be treated as 2314 * NO TX unless the channel is explicitly allowed in which case 2315 * your current regulatory domain would not have the passive scan 2316 * flag. 2317 * 2318 * Since AP mode uses monitor interfaces to inject/TX management 2319 * frames we can make AP mode the exception to this rule once it 2320 * supports radar detection as its implementation can deal with 2321 * radar detection by itself. We can do that later by adding a 2322 * monitor flag interfaces used for AP support. 2323 */ 2324 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2325 sdata->vif.type)) 2326 goto fail_rcu; 2327 2328 info->band = chandef->chan->band; 2329 2330 /* process and remove the injection radiotap header */ 2331 if (!ieee80211_parse_tx_radiotap(local, skb)) 2332 goto fail_rcu; 2333 2334 ieee80211_xmit(sdata, NULL, skb, 0); 2335 rcu_read_unlock(); 2336 2337 return NETDEV_TX_OK; 2338 2339 fail_rcu: 2340 rcu_read_unlock(); 2341 fail: 2342 dev_kfree_skb(skb); 2343 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2344 } 2345 2346 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2347 { 2348 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2349 2350 return ethertype == ETH_P_TDLS && 2351 skb->len > 14 && 2352 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2353 } 2354 2355 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2356 struct sk_buff *skb, 2357 struct sta_info **sta_out) 2358 { 2359 struct sta_info *sta; 2360 2361 switch (sdata->vif.type) { 2362 case NL80211_IFTYPE_AP_VLAN: 2363 sta = rcu_dereference(sdata->u.vlan.sta); 2364 if (sta) { 2365 *sta_out = sta; 2366 return 0; 2367 } else if (sdata->wdev.use_4addr) { 2368 return -ENOLINK; 2369 } 2370 /* fall through */ 2371 case NL80211_IFTYPE_AP: 2372 case NL80211_IFTYPE_OCB: 2373 case NL80211_IFTYPE_ADHOC: 2374 if (is_multicast_ether_addr(skb->data)) { 2375 *sta_out = ERR_PTR(-ENOENT); 2376 return 0; 2377 } 2378 sta = sta_info_get_bss(sdata, skb->data); 2379 break; 2380 case NL80211_IFTYPE_WDS: 2381 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2382 break; 2383 #ifdef CONFIG_MAC80211_MESH 2384 case NL80211_IFTYPE_MESH_POINT: 2385 /* determined much later */ 2386 *sta_out = NULL; 2387 return 0; 2388 #endif 2389 case NL80211_IFTYPE_STATION: 2390 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2391 sta = sta_info_get(sdata, skb->data); 2392 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2393 if (test_sta_flag(sta, 2394 WLAN_STA_TDLS_PEER_AUTH)) { 2395 *sta_out = sta; 2396 return 0; 2397 } 2398 2399 /* 2400 * TDLS link during setup - throw out frames to 2401 * peer. Allow TDLS-setup frames to unauthorized 2402 * peers for the special case of a link teardown 2403 * after a TDLS sta is removed due to being 2404 * unreachable. 2405 */ 2406 if (!ieee80211_is_tdls_setup(skb)) 2407 return -EINVAL; 2408 } 2409 2410 } 2411 2412 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2413 if (!sta) 2414 return -ENOLINK; 2415 break; 2416 default: 2417 return -EINVAL; 2418 } 2419 2420 *sta_out = sta ?: ERR_PTR(-ENOENT); 2421 return 0; 2422 } 2423 2424 static int ieee80211_store_ack_skb(struct ieee80211_local *local, 2425 struct sk_buff *skb, 2426 u32 *info_flags) 2427 { 2428 struct sk_buff *ack_skb = skb_clone_sk(skb); 2429 u16 info_id = 0; 2430 2431 if (ack_skb) { 2432 unsigned long flags; 2433 int id; 2434 2435 spin_lock_irqsave(&local->ack_status_lock, flags); 2436 id = idr_alloc(&local->ack_status_frames, ack_skb, 2437 1, 0x40, GFP_ATOMIC); 2438 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2439 2440 if (id >= 0) { 2441 info_id = id; 2442 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2443 } else { 2444 kfree_skb(ack_skb); 2445 } 2446 } 2447 2448 return info_id; 2449 } 2450 2451 /** 2452 * ieee80211_build_hdr - build 802.11 header in the given frame 2453 * @sdata: virtual interface to build the header for 2454 * @skb: the skb to build the header in 2455 * @info_flags: skb flags to set 2456 * @ctrl_flags: info control flags to set 2457 * 2458 * This function takes the skb with 802.3 header and reformats the header to 2459 * the appropriate IEEE 802.11 header based on which interface the packet is 2460 * being transmitted on. 2461 * 2462 * Note that this function also takes care of the TX status request and 2463 * potential unsharing of the SKB - this needs to be interleaved with the 2464 * header building. 2465 * 2466 * The function requires the read-side RCU lock held 2467 * 2468 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2469 */ 2470 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2471 struct sk_buff *skb, u32 info_flags, 2472 struct sta_info *sta, u32 ctrl_flags) 2473 { 2474 struct ieee80211_local *local = sdata->local; 2475 struct ieee80211_tx_info *info; 2476 int head_need; 2477 u16 ethertype, hdrlen, meshhdrlen = 0; 2478 __le16 fc; 2479 struct ieee80211_hdr hdr; 2480 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2481 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2482 const u8 *encaps_data; 2483 int encaps_len, skip_header_bytes; 2484 bool wme_sta = false, authorized = false; 2485 bool tdls_peer; 2486 bool multicast; 2487 u16 info_id = 0; 2488 struct ieee80211_chanctx_conf *chanctx_conf; 2489 struct ieee80211_sub_if_data *ap_sdata; 2490 enum nl80211_band band; 2491 int ret; 2492 2493 if (IS_ERR(sta)) 2494 sta = NULL; 2495 2496 #ifdef CONFIG_MAC80211_DEBUGFS 2497 if (local->force_tx_status) 2498 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2499 #endif 2500 2501 /* convert Ethernet header to proper 802.11 header (based on 2502 * operation mode) */ 2503 ethertype = (skb->data[12] << 8) | skb->data[13]; 2504 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2505 2506 switch (sdata->vif.type) { 2507 case NL80211_IFTYPE_AP_VLAN: 2508 if (sdata->wdev.use_4addr) { 2509 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2510 /* RA TA DA SA */ 2511 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2512 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2513 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2514 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2515 hdrlen = 30; 2516 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2517 wme_sta = sta->sta.wme; 2518 } 2519 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2520 u.ap); 2521 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2522 if (!chanctx_conf) { 2523 ret = -ENOTCONN; 2524 goto free; 2525 } 2526 band = chanctx_conf->def.chan->band; 2527 if (sdata->wdev.use_4addr) 2528 break; 2529 /* fall through */ 2530 case NL80211_IFTYPE_AP: 2531 if (sdata->vif.type == NL80211_IFTYPE_AP) 2532 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2533 if (!chanctx_conf) { 2534 ret = -ENOTCONN; 2535 goto free; 2536 } 2537 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2538 /* DA BSSID SA */ 2539 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2540 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2541 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2542 hdrlen = 24; 2543 band = chanctx_conf->def.chan->band; 2544 break; 2545 case NL80211_IFTYPE_WDS: 2546 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2547 /* RA TA DA SA */ 2548 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2549 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2550 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2551 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2552 hdrlen = 30; 2553 /* 2554 * This is the exception! WDS style interfaces are prohibited 2555 * when channel contexts are in used so this must be valid 2556 */ 2557 band = local->hw.conf.chandef.chan->band; 2558 break; 2559 #ifdef CONFIG_MAC80211_MESH 2560 case NL80211_IFTYPE_MESH_POINT: 2561 if (!is_multicast_ether_addr(skb->data)) { 2562 struct sta_info *next_hop; 2563 bool mpp_lookup = true; 2564 2565 mpath = mesh_path_lookup(sdata, skb->data); 2566 if (mpath) { 2567 mpp_lookup = false; 2568 next_hop = rcu_dereference(mpath->next_hop); 2569 if (!next_hop || 2570 !(mpath->flags & (MESH_PATH_ACTIVE | 2571 MESH_PATH_RESOLVING))) 2572 mpp_lookup = true; 2573 } 2574 2575 if (mpp_lookup) { 2576 mppath = mpp_path_lookup(sdata, skb->data); 2577 if (mppath) 2578 mppath->exp_time = jiffies; 2579 } 2580 2581 if (mppath && mpath) 2582 mesh_path_del(sdata, mpath->dst); 2583 } 2584 2585 /* 2586 * Use address extension if it is a packet from 2587 * another interface or if we know the destination 2588 * is being proxied by a portal (i.e. portal address 2589 * differs from proxied address) 2590 */ 2591 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2592 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2593 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2594 skb->data, skb->data + ETH_ALEN); 2595 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2596 NULL, NULL); 2597 } else { 2598 /* DS -> MBSS (802.11-2012 13.11.3.3). 2599 * For unicast with unknown forwarding information, 2600 * destination might be in the MBSS or if that fails 2601 * forwarded to another mesh gate. In either case 2602 * resolution will be handled in ieee80211_xmit(), so 2603 * leave the original DA. This also works for mcast */ 2604 const u8 *mesh_da = skb->data; 2605 2606 if (mppath) 2607 mesh_da = mppath->mpp; 2608 else if (mpath) 2609 mesh_da = mpath->dst; 2610 2611 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2612 mesh_da, sdata->vif.addr); 2613 if (is_multicast_ether_addr(mesh_da)) 2614 /* DA TA mSA AE:SA */ 2615 meshhdrlen = ieee80211_new_mesh_header( 2616 sdata, &mesh_hdr, 2617 skb->data + ETH_ALEN, NULL); 2618 else 2619 /* RA TA mDA mSA AE:DA SA */ 2620 meshhdrlen = ieee80211_new_mesh_header( 2621 sdata, &mesh_hdr, skb->data, 2622 skb->data + ETH_ALEN); 2623 2624 } 2625 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2626 if (!chanctx_conf) { 2627 ret = -ENOTCONN; 2628 goto free; 2629 } 2630 band = chanctx_conf->def.chan->band; 2631 2632 /* For injected frames, fill RA right away as nexthop lookup 2633 * will be skipped. 2634 */ 2635 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2636 is_zero_ether_addr(hdr.addr1)) 2637 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2638 break; 2639 #endif 2640 case NL80211_IFTYPE_STATION: 2641 /* we already did checks when looking up the RA STA */ 2642 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2643 2644 if (tdls_peer) { 2645 /* DA SA BSSID */ 2646 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2647 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2648 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2649 hdrlen = 24; 2650 } else if (sdata->u.mgd.use_4addr && 2651 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2652 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2653 IEEE80211_FCTL_TODS); 2654 /* RA TA DA SA */ 2655 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2656 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2657 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2658 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2659 hdrlen = 30; 2660 } else { 2661 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2662 /* BSSID SA DA */ 2663 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2664 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2665 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2666 hdrlen = 24; 2667 } 2668 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2669 if (!chanctx_conf) { 2670 ret = -ENOTCONN; 2671 goto free; 2672 } 2673 band = chanctx_conf->def.chan->band; 2674 break; 2675 case NL80211_IFTYPE_OCB: 2676 /* DA SA BSSID */ 2677 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2678 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2679 eth_broadcast_addr(hdr.addr3); 2680 hdrlen = 24; 2681 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2682 if (!chanctx_conf) { 2683 ret = -ENOTCONN; 2684 goto free; 2685 } 2686 band = chanctx_conf->def.chan->band; 2687 break; 2688 case NL80211_IFTYPE_ADHOC: 2689 /* DA SA BSSID */ 2690 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2691 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2692 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2693 hdrlen = 24; 2694 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2695 if (!chanctx_conf) { 2696 ret = -ENOTCONN; 2697 goto free; 2698 } 2699 band = chanctx_conf->def.chan->band; 2700 break; 2701 default: 2702 ret = -EINVAL; 2703 goto free; 2704 } 2705 2706 multicast = is_multicast_ether_addr(hdr.addr1); 2707 2708 /* sta is always NULL for mesh */ 2709 if (sta) { 2710 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2711 wme_sta = sta->sta.wme; 2712 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2713 /* For mesh, the use of the QoS header is mandatory */ 2714 wme_sta = true; 2715 } 2716 2717 /* receiver does QoS (which also means we do) use it */ 2718 if (wme_sta) { 2719 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2720 hdrlen += 2; 2721 } 2722 2723 /* 2724 * Drop unicast frames to unauthorised stations unless they are 2725 * EAPOL frames from the local station. 2726 */ 2727 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2728 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2729 !multicast && !authorized && 2730 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2731 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2732 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2733 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2734 sdata->name, hdr.addr1); 2735 #endif 2736 2737 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2738 2739 ret = -EPERM; 2740 goto free; 2741 } 2742 2743 if (unlikely(!multicast && skb->sk && 2744 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 2745 info_id = ieee80211_store_ack_skb(local, skb, &info_flags); 2746 2747 /* 2748 * If the skb is shared we need to obtain our own copy. 2749 */ 2750 if (skb_shared(skb)) { 2751 struct sk_buff *tmp_skb = skb; 2752 2753 /* can't happen -- skb is a clone if info_id != 0 */ 2754 WARN_ON(info_id); 2755 2756 skb = skb_clone(skb, GFP_ATOMIC); 2757 kfree_skb(tmp_skb); 2758 2759 if (!skb) { 2760 ret = -ENOMEM; 2761 goto free; 2762 } 2763 } 2764 2765 hdr.frame_control = fc; 2766 hdr.duration_id = 0; 2767 hdr.seq_ctrl = 0; 2768 2769 skip_header_bytes = ETH_HLEN; 2770 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2771 encaps_data = bridge_tunnel_header; 2772 encaps_len = sizeof(bridge_tunnel_header); 2773 skip_header_bytes -= 2; 2774 } else if (ethertype >= ETH_P_802_3_MIN) { 2775 encaps_data = rfc1042_header; 2776 encaps_len = sizeof(rfc1042_header); 2777 skip_header_bytes -= 2; 2778 } else { 2779 encaps_data = NULL; 2780 encaps_len = 0; 2781 } 2782 2783 skb_pull(skb, skip_header_bytes); 2784 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2785 2786 /* 2787 * So we need to modify the skb header and hence need a copy of 2788 * that. The head_need variable above doesn't, so far, include 2789 * the needed header space that we don't need right away. If we 2790 * can, then we don't reallocate right now but only after the 2791 * frame arrives at the master device (if it does...) 2792 * 2793 * If we cannot, however, then we will reallocate to include all 2794 * the ever needed space. Also, if we need to reallocate it anyway, 2795 * make it big enough for everything we may ever need. 2796 */ 2797 2798 if (head_need > 0 || skb_cloned(skb)) { 2799 head_need += sdata->encrypt_headroom; 2800 head_need += local->tx_headroom; 2801 head_need = max_t(int, 0, head_need); 2802 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2803 ieee80211_free_txskb(&local->hw, skb); 2804 skb = NULL; 2805 return ERR_PTR(-ENOMEM); 2806 } 2807 } 2808 2809 if (encaps_data) 2810 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2811 2812 #ifdef CONFIG_MAC80211_MESH 2813 if (meshhdrlen > 0) 2814 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2815 #endif 2816 2817 if (ieee80211_is_data_qos(fc)) { 2818 __le16 *qos_control; 2819 2820 qos_control = skb_push(skb, 2); 2821 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2822 /* 2823 * Maybe we could actually set some fields here, for now just 2824 * initialise to zero to indicate no special operation. 2825 */ 2826 *qos_control = 0; 2827 } else 2828 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2829 2830 skb_reset_mac_header(skb); 2831 2832 info = IEEE80211_SKB_CB(skb); 2833 memset(info, 0, sizeof(*info)); 2834 2835 info->flags = info_flags; 2836 info->ack_frame_id = info_id; 2837 info->band = band; 2838 info->control.flags = ctrl_flags; 2839 2840 return skb; 2841 free: 2842 kfree_skb(skb); 2843 return ERR_PTR(ret); 2844 } 2845 2846 /* 2847 * fast-xmit overview 2848 * 2849 * The core idea of this fast-xmit is to remove per-packet checks by checking 2850 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2851 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2852 * much less work can be done per packet. For example, fragmentation must be 2853 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2854 * in the code here. 2855 * 2856 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2857 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2858 * 2859 * The most difficult part of this is that when any of these assumptions 2860 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2861 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2862 * since the per-packet code no longer checks the conditions. This is reflected 2863 * by the calls to these functions throughout the rest of the code, and must be 2864 * maintained if any of the TX path checks change. 2865 */ 2866 2867 void ieee80211_check_fast_xmit(struct sta_info *sta) 2868 { 2869 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2870 struct ieee80211_local *local = sta->local; 2871 struct ieee80211_sub_if_data *sdata = sta->sdata; 2872 struct ieee80211_hdr *hdr = (void *)build.hdr; 2873 struct ieee80211_chanctx_conf *chanctx_conf; 2874 __le16 fc; 2875 2876 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2877 return; 2878 2879 /* Locking here protects both the pointer itself, and against concurrent 2880 * invocations winning data access races to, e.g., the key pointer that 2881 * is used. 2882 * Without it, the invocation of this function right after the key 2883 * pointer changes wouldn't be sufficient, as another CPU could access 2884 * the pointer, then stall, and then do the cache update after the CPU 2885 * that invalidated the key. 2886 * With the locking, such scenarios cannot happen as the check for the 2887 * key and the fast-tx assignment are done atomically, so the CPU that 2888 * modifies the key will either wait or other one will see the key 2889 * cleared/changed already. 2890 */ 2891 spin_lock_bh(&sta->lock); 2892 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2893 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2894 sdata->vif.type == NL80211_IFTYPE_STATION) 2895 goto out; 2896 2897 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2898 goto out; 2899 2900 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2901 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2902 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2903 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2904 goto out; 2905 2906 if (sdata->noack_map) 2907 goto out; 2908 2909 /* fast-xmit doesn't handle fragmentation at all */ 2910 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2911 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2912 goto out; 2913 2914 rcu_read_lock(); 2915 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2916 if (!chanctx_conf) { 2917 rcu_read_unlock(); 2918 goto out; 2919 } 2920 build.band = chanctx_conf->def.chan->band; 2921 rcu_read_unlock(); 2922 2923 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2924 2925 switch (sdata->vif.type) { 2926 case NL80211_IFTYPE_ADHOC: 2927 /* DA SA BSSID */ 2928 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2929 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2930 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2931 build.hdr_len = 24; 2932 break; 2933 case NL80211_IFTYPE_STATION: 2934 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2935 /* DA SA BSSID */ 2936 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2937 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2938 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2939 build.hdr_len = 24; 2940 break; 2941 } 2942 2943 if (sdata->u.mgd.use_4addr) { 2944 /* non-regular ethertype cannot use the fastpath */ 2945 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2946 IEEE80211_FCTL_TODS); 2947 /* RA TA DA SA */ 2948 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2949 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2950 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2951 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2952 build.hdr_len = 30; 2953 break; 2954 } 2955 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2956 /* BSSID SA DA */ 2957 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2958 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2959 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2960 build.hdr_len = 24; 2961 break; 2962 case NL80211_IFTYPE_AP_VLAN: 2963 if (sdata->wdev.use_4addr) { 2964 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2965 IEEE80211_FCTL_TODS); 2966 /* RA TA DA SA */ 2967 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2968 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2969 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2970 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2971 build.hdr_len = 30; 2972 break; 2973 } 2974 /* fall through */ 2975 case NL80211_IFTYPE_AP: 2976 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2977 /* DA BSSID SA */ 2978 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2979 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2980 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2981 build.hdr_len = 24; 2982 break; 2983 default: 2984 /* not handled on fast-xmit */ 2985 goto out; 2986 } 2987 2988 if (sta->sta.wme) { 2989 build.hdr_len += 2; 2990 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2991 } 2992 2993 /* We store the key here so there's no point in using rcu_dereference() 2994 * but that's fine because the code that changes the pointers will call 2995 * this function after doing so. For a single CPU that would be enough, 2996 * for multiple see the comment above. 2997 */ 2998 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2999 if (!build.key) 3000 build.key = rcu_access_pointer(sdata->default_unicast_key); 3001 if (build.key) { 3002 bool gen_iv, iv_spc, mmic; 3003 3004 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3005 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3006 mmic = build.key->conf.flags & 3007 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3008 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3009 3010 /* don't handle software crypto */ 3011 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3012 goto out; 3013 3014 /* Key is being removed */ 3015 if (build.key->flags & KEY_FLAG_TAINTED) 3016 goto out; 3017 3018 switch (build.key->conf.cipher) { 3019 case WLAN_CIPHER_SUITE_CCMP: 3020 case WLAN_CIPHER_SUITE_CCMP_256: 3021 if (gen_iv) 3022 build.pn_offs = build.hdr_len; 3023 if (gen_iv || iv_spc) 3024 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3025 break; 3026 case WLAN_CIPHER_SUITE_GCMP: 3027 case WLAN_CIPHER_SUITE_GCMP_256: 3028 if (gen_iv) 3029 build.pn_offs = build.hdr_len; 3030 if (gen_iv || iv_spc) 3031 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3032 break; 3033 case WLAN_CIPHER_SUITE_TKIP: 3034 /* cannot handle MMIC or IV generation in xmit-fast */ 3035 if (mmic || gen_iv) 3036 goto out; 3037 if (iv_spc) 3038 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3039 break; 3040 case WLAN_CIPHER_SUITE_WEP40: 3041 case WLAN_CIPHER_SUITE_WEP104: 3042 /* cannot handle IV generation in fast-xmit */ 3043 if (gen_iv) 3044 goto out; 3045 if (iv_spc) 3046 build.hdr_len += IEEE80211_WEP_IV_LEN; 3047 break; 3048 case WLAN_CIPHER_SUITE_AES_CMAC: 3049 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3050 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3051 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3052 WARN(1, 3053 "management cipher suite 0x%x enabled for data\n", 3054 build.key->conf.cipher); 3055 goto out; 3056 default: 3057 /* we don't know how to generate IVs for this at all */ 3058 if (WARN_ON(gen_iv)) 3059 goto out; 3060 /* pure hardware keys are OK, of course */ 3061 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3062 break; 3063 /* cipher scheme might require space allocation */ 3064 if (iv_spc && 3065 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3066 goto out; 3067 if (iv_spc) 3068 build.hdr_len += build.key->conf.iv_len; 3069 } 3070 3071 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3072 } 3073 3074 hdr->frame_control = fc; 3075 3076 memcpy(build.hdr + build.hdr_len, 3077 rfc1042_header, sizeof(rfc1042_header)); 3078 build.hdr_len += sizeof(rfc1042_header); 3079 3080 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3081 /* if the kmemdup fails, continue w/o fast_tx */ 3082 if (!fast_tx) 3083 goto out; 3084 3085 out: 3086 /* we might have raced against another call to this function */ 3087 old = rcu_dereference_protected(sta->fast_tx, 3088 lockdep_is_held(&sta->lock)); 3089 rcu_assign_pointer(sta->fast_tx, fast_tx); 3090 if (old) 3091 kfree_rcu(old, rcu_head); 3092 spin_unlock_bh(&sta->lock); 3093 } 3094 3095 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3096 { 3097 struct sta_info *sta; 3098 3099 rcu_read_lock(); 3100 list_for_each_entry_rcu(sta, &local->sta_list, list) 3101 ieee80211_check_fast_xmit(sta); 3102 rcu_read_unlock(); 3103 } 3104 3105 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3106 { 3107 struct ieee80211_local *local = sdata->local; 3108 struct sta_info *sta; 3109 3110 rcu_read_lock(); 3111 3112 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3113 if (sdata != sta->sdata && 3114 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3115 continue; 3116 ieee80211_check_fast_xmit(sta); 3117 } 3118 3119 rcu_read_unlock(); 3120 } 3121 3122 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3123 { 3124 struct ieee80211_fast_tx *fast_tx; 3125 3126 spin_lock_bh(&sta->lock); 3127 fast_tx = rcu_dereference_protected(sta->fast_tx, 3128 lockdep_is_held(&sta->lock)); 3129 RCU_INIT_POINTER(sta->fast_tx, NULL); 3130 spin_unlock_bh(&sta->lock); 3131 3132 if (fast_tx) 3133 kfree_rcu(fast_tx, rcu_head); 3134 } 3135 3136 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3137 struct sk_buff *skb, int headroom) 3138 { 3139 if (skb_headroom(skb) < headroom) { 3140 I802_DEBUG_INC(local->tx_expand_skb_head); 3141 3142 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3143 wiphy_debug(local->hw.wiphy, 3144 "failed to reallocate TX buffer\n"); 3145 return false; 3146 } 3147 } 3148 3149 return true; 3150 } 3151 3152 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3153 struct ieee80211_fast_tx *fast_tx, 3154 struct sk_buff *skb) 3155 { 3156 struct ieee80211_local *local = sdata->local; 3157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3158 struct ieee80211_hdr *hdr; 3159 struct ethhdr *amsdu_hdr; 3160 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3161 int subframe_len = skb->len - hdr_len; 3162 void *data; 3163 u8 *qc, *h_80211_src, *h_80211_dst; 3164 const u8 *bssid; 3165 3166 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3167 return false; 3168 3169 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3170 return true; 3171 3172 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3173 return false; 3174 3175 data = skb_push(skb, sizeof(*amsdu_hdr)); 3176 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3177 hdr = data; 3178 amsdu_hdr = data + hdr_len; 3179 /* h_80211_src/dst is addr* field within hdr */ 3180 h_80211_src = data + fast_tx->sa_offs; 3181 h_80211_dst = data + fast_tx->da_offs; 3182 3183 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3184 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3185 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3186 3187 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3188 * fields needs to be changed to BSSID for A-MSDU frames depending 3189 * on FromDS/ToDS values. 3190 */ 3191 switch (sdata->vif.type) { 3192 case NL80211_IFTYPE_STATION: 3193 bssid = sdata->u.mgd.bssid; 3194 break; 3195 case NL80211_IFTYPE_AP: 3196 case NL80211_IFTYPE_AP_VLAN: 3197 bssid = sdata->vif.addr; 3198 break; 3199 default: 3200 bssid = NULL; 3201 } 3202 3203 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3204 ether_addr_copy(h_80211_src, bssid); 3205 3206 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3207 ether_addr_copy(h_80211_dst, bssid); 3208 3209 qc = ieee80211_get_qos_ctl(hdr); 3210 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3211 3212 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3213 3214 return true; 3215 } 3216 3217 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3218 struct sta_info *sta, 3219 struct ieee80211_fast_tx *fast_tx, 3220 struct sk_buff *skb) 3221 { 3222 struct ieee80211_local *local = sdata->local; 3223 struct fq *fq = &local->fq; 3224 struct fq_tin *tin; 3225 struct fq_flow *flow; 3226 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3227 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3228 struct txq_info *txqi; 3229 struct sk_buff **frag_tail, *head; 3230 int subframe_len = skb->len - ETH_ALEN; 3231 u8 max_subframes = sta->sta.max_amsdu_subframes; 3232 int max_frags = local->hw.max_tx_fragments; 3233 int max_amsdu_len = sta->sta.max_amsdu_len; 3234 int orig_truesize; 3235 u32 flow_idx; 3236 __be16 len; 3237 void *data; 3238 bool ret = false; 3239 unsigned int orig_len; 3240 int n = 2, nfrags, pad = 0; 3241 u16 hdrlen; 3242 3243 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3244 return false; 3245 3246 if (skb_is_gso(skb)) 3247 return false; 3248 3249 if (!txq) 3250 return false; 3251 3252 txqi = to_txq_info(txq); 3253 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3254 return false; 3255 3256 if (sta->sta.max_rc_amsdu_len) 3257 max_amsdu_len = min_t(int, max_amsdu_len, 3258 sta->sta.max_rc_amsdu_len); 3259 3260 if (sta->sta.max_tid_amsdu_len[tid]) 3261 max_amsdu_len = min_t(int, max_amsdu_len, 3262 sta->sta.max_tid_amsdu_len[tid]); 3263 3264 flow_idx = fq_flow_idx(fq, skb); 3265 3266 spin_lock_bh(&fq->lock); 3267 3268 /* TODO: Ideally aggregation should be done on dequeue to remain 3269 * responsive to environment changes. 3270 */ 3271 3272 tin = &txqi->tin; 3273 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3274 fq_flow_get_default_func); 3275 head = skb_peek_tail(&flow->queue); 3276 if (!head || skb_is_gso(head)) 3277 goto out; 3278 3279 orig_truesize = head->truesize; 3280 orig_len = head->len; 3281 3282 if (skb->len + head->len > max_amsdu_len) 3283 goto out; 3284 3285 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3286 nfrags += 1 + skb_shinfo(head)->nr_frags; 3287 frag_tail = &skb_shinfo(head)->frag_list; 3288 while (*frag_tail) { 3289 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3290 frag_tail = &(*frag_tail)->next; 3291 n++; 3292 } 3293 3294 if (max_subframes && n > max_subframes) 3295 goto out; 3296 3297 if (max_frags && nfrags > max_frags) 3298 goto out; 3299 3300 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3301 goto out; 3302 3303 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3304 goto out; 3305 3306 /* 3307 * Pad out the previous subframe to a multiple of 4 by adding the 3308 * padding to the next one, that's being added. Note that head->len 3309 * is the length of the full A-MSDU, but that works since each time 3310 * we add a new subframe we pad out the previous one to a multiple 3311 * of 4 and thus it no longer matters in the next round. 3312 */ 3313 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3314 if ((head->len - hdrlen) & 3) 3315 pad = 4 - ((head->len - hdrlen) & 3); 3316 3317 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3318 2 + pad)) 3319 goto out_recalc; 3320 3321 ret = true; 3322 data = skb_push(skb, ETH_ALEN + 2); 3323 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3324 3325 data += 2 * ETH_ALEN; 3326 len = cpu_to_be16(subframe_len); 3327 memcpy(data, &len, 2); 3328 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3329 3330 memset(skb_push(skb, pad), 0, pad); 3331 3332 head->len += skb->len; 3333 head->data_len += skb->len; 3334 *frag_tail = skb; 3335 3336 out_recalc: 3337 fq->memory_usage += head->truesize - orig_truesize; 3338 if (head->len != orig_len) { 3339 flow->backlog += head->len - orig_len; 3340 tin->backlog_bytes += head->len - orig_len; 3341 3342 fq_recalc_backlog(fq, tin, flow); 3343 } 3344 out: 3345 spin_unlock_bh(&fq->lock); 3346 3347 return ret; 3348 } 3349 3350 /* 3351 * Can be called while the sta lock is held. Anything that can cause packets to 3352 * be generated will cause deadlock! 3353 */ 3354 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3355 struct sta_info *sta, u8 pn_offs, 3356 struct ieee80211_key *key, 3357 struct sk_buff *skb) 3358 { 3359 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3360 struct ieee80211_hdr *hdr = (void *)skb->data; 3361 u8 tid = IEEE80211_NUM_TIDS; 3362 3363 if (key) 3364 info->control.hw_key = &key->conf; 3365 3366 ieee80211_tx_stats(skb->dev, skb->len); 3367 3368 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3369 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3370 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3371 } else { 3372 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3373 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3374 sdata->sequence_number += 0x10; 3375 } 3376 3377 if (skb_shinfo(skb)->gso_size) 3378 sta->tx_stats.msdu[tid] += 3379 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3380 else 3381 sta->tx_stats.msdu[tid]++; 3382 3383 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3384 3385 /* statistics normally done by ieee80211_tx_h_stats (but that 3386 * has to consider fragmentation, so is more complex) 3387 */ 3388 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3389 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3390 3391 if (pn_offs) { 3392 u64 pn; 3393 u8 *crypto_hdr = skb->data + pn_offs; 3394 3395 switch (key->conf.cipher) { 3396 case WLAN_CIPHER_SUITE_CCMP: 3397 case WLAN_CIPHER_SUITE_CCMP_256: 3398 case WLAN_CIPHER_SUITE_GCMP: 3399 case WLAN_CIPHER_SUITE_GCMP_256: 3400 pn = atomic64_inc_return(&key->conf.tx_pn); 3401 crypto_hdr[0] = pn; 3402 crypto_hdr[1] = pn >> 8; 3403 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3404 crypto_hdr[4] = pn >> 16; 3405 crypto_hdr[5] = pn >> 24; 3406 crypto_hdr[6] = pn >> 32; 3407 crypto_hdr[7] = pn >> 40; 3408 break; 3409 } 3410 } 3411 } 3412 3413 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3414 struct sta_info *sta, 3415 struct ieee80211_fast_tx *fast_tx, 3416 struct sk_buff *skb) 3417 { 3418 struct ieee80211_local *local = sdata->local; 3419 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3420 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3421 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3422 struct ethhdr eth; 3423 struct ieee80211_tx_info *info; 3424 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3425 struct ieee80211_tx_data tx; 3426 ieee80211_tx_result r; 3427 struct tid_ampdu_tx *tid_tx = NULL; 3428 u8 tid = IEEE80211_NUM_TIDS; 3429 3430 /* control port protocol needs a lot of special handling */ 3431 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3432 return false; 3433 3434 /* only RFC 1042 SNAP */ 3435 if (ethertype < ETH_P_802_3_MIN) 3436 return false; 3437 3438 /* don't handle TX status request here either */ 3439 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3440 return false; 3441 3442 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3443 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3444 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3445 if (tid_tx) { 3446 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3447 return false; 3448 if (tid_tx->timeout) 3449 tid_tx->last_tx = jiffies; 3450 } 3451 } 3452 3453 /* after this point (skb is modified) we cannot return false */ 3454 3455 if (skb_shared(skb)) { 3456 struct sk_buff *tmp_skb = skb; 3457 3458 skb = skb_clone(skb, GFP_ATOMIC); 3459 kfree_skb(tmp_skb); 3460 3461 if (!skb) 3462 return true; 3463 } 3464 3465 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3466 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3467 return true; 3468 3469 /* will not be crypto-handled beyond what we do here, so use false 3470 * as the may-encrypt argument for the resize to not account for 3471 * more room than we already have in 'extra_head' 3472 */ 3473 if (unlikely(ieee80211_skb_resize(sdata, skb, 3474 max_t(int, extra_head + hw_headroom - 3475 skb_headroom(skb), 0), 3476 false))) { 3477 kfree_skb(skb); 3478 return true; 3479 } 3480 3481 memcpy(ð, skb->data, ETH_HLEN - 2); 3482 hdr = skb_push(skb, extra_head); 3483 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3484 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3485 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3486 3487 info = IEEE80211_SKB_CB(skb); 3488 memset(info, 0, sizeof(*info)); 3489 info->band = fast_tx->band; 3490 info->control.vif = &sdata->vif; 3491 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3492 IEEE80211_TX_CTL_DONTFRAG | 3493 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3494 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3495 3496 #ifdef CONFIG_MAC80211_DEBUGFS 3497 if (local->force_tx_status) 3498 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3499 #endif 3500 3501 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3502 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3503 *ieee80211_get_qos_ctl(hdr) = tid; 3504 } 3505 3506 __skb_queue_head_init(&tx.skbs); 3507 3508 tx.flags = IEEE80211_TX_UNICAST; 3509 tx.local = local; 3510 tx.sdata = sdata; 3511 tx.sta = sta; 3512 tx.key = fast_tx->key; 3513 3514 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3515 tx.skb = skb; 3516 r = ieee80211_tx_h_rate_ctrl(&tx); 3517 skb = tx.skb; 3518 tx.skb = NULL; 3519 3520 if (r != TX_CONTINUE) { 3521 if (r != TX_QUEUED) 3522 kfree_skb(skb); 3523 return true; 3524 } 3525 } 3526 3527 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3528 return true; 3529 3530 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3531 fast_tx->key, skb); 3532 3533 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3534 sdata = container_of(sdata->bss, 3535 struct ieee80211_sub_if_data, u.ap); 3536 3537 __skb_queue_tail(&tx.skbs, skb); 3538 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3539 return true; 3540 } 3541 3542 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3543 struct ieee80211_txq *txq) 3544 { 3545 struct ieee80211_local *local = hw_to_local(hw); 3546 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3547 struct ieee80211_hdr *hdr; 3548 struct sk_buff *skb = NULL; 3549 struct fq *fq = &local->fq; 3550 struct fq_tin *tin = &txqi->tin; 3551 struct ieee80211_tx_info *info; 3552 struct ieee80211_tx_data tx; 3553 ieee80211_tx_result r; 3554 struct ieee80211_vif *vif = txq->vif; 3555 3556 WARN_ON_ONCE(softirq_count() == 0); 3557 3558 if (!ieee80211_txq_airtime_check(hw, txq)) 3559 return NULL; 3560 3561 begin: 3562 spin_lock_bh(&fq->lock); 3563 3564 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3565 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3566 goto out; 3567 3568 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3569 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3570 goto out; 3571 } 3572 3573 /* Make sure fragments stay together. */ 3574 skb = __skb_dequeue(&txqi->frags); 3575 if (skb) 3576 goto out; 3577 3578 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3579 if (!skb) 3580 goto out; 3581 3582 spin_unlock_bh(&fq->lock); 3583 3584 hdr = (struct ieee80211_hdr *)skb->data; 3585 info = IEEE80211_SKB_CB(skb); 3586 3587 memset(&tx, 0, sizeof(tx)); 3588 __skb_queue_head_init(&tx.skbs); 3589 tx.local = local; 3590 tx.skb = skb; 3591 tx.sdata = vif_to_sdata(info->control.vif); 3592 3593 if (txq->sta) 3594 tx.sta = container_of(txq->sta, struct sta_info, sta); 3595 3596 /* 3597 * The key can be removed while the packet was queued, so need to call 3598 * this here to get the current key. 3599 */ 3600 r = ieee80211_tx_h_select_key(&tx); 3601 if (r != TX_CONTINUE) { 3602 ieee80211_free_txskb(&local->hw, skb); 3603 goto begin; 3604 } 3605 3606 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3607 info->flags |= IEEE80211_TX_CTL_AMPDU; 3608 else 3609 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3610 3611 if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) 3612 goto encap_out; 3613 3614 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3615 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3616 sta); 3617 u8 pn_offs = 0; 3618 3619 if (tx.key && 3620 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3621 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3622 3623 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3624 tx.key, skb); 3625 } else { 3626 if (invoke_tx_handlers_late(&tx)) 3627 goto begin; 3628 3629 skb = __skb_dequeue(&tx.skbs); 3630 3631 if (!skb_queue_empty(&tx.skbs)) { 3632 spin_lock_bh(&fq->lock); 3633 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3634 spin_unlock_bh(&fq->lock); 3635 } 3636 } 3637 3638 if (skb_has_frag_list(skb) && 3639 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3640 if (skb_linearize(skb)) { 3641 ieee80211_free_txskb(&local->hw, skb); 3642 goto begin; 3643 } 3644 } 3645 3646 switch (tx.sdata->vif.type) { 3647 case NL80211_IFTYPE_MONITOR: 3648 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3649 vif = &tx.sdata->vif; 3650 break; 3651 } 3652 tx.sdata = rcu_dereference(local->monitor_sdata); 3653 if (tx.sdata) { 3654 vif = &tx.sdata->vif; 3655 info->hw_queue = 3656 vif->hw_queue[skb_get_queue_mapping(skb)]; 3657 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3658 ieee80211_free_txskb(&local->hw, skb); 3659 goto begin; 3660 } else { 3661 vif = NULL; 3662 } 3663 break; 3664 case NL80211_IFTYPE_AP_VLAN: 3665 tx.sdata = container_of(tx.sdata->bss, 3666 struct ieee80211_sub_if_data, u.ap); 3667 /* fall through */ 3668 default: 3669 vif = &tx.sdata->vif; 3670 break; 3671 } 3672 3673 encap_out: 3674 IEEE80211_SKB_CB(skb)->control.vif = vif; 3675 3676 if (local->airtime_flags & AIRTIME_USE_AQL) { 3677 u32 airtime; 3678 3679 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3680 skb->len); 3681 if (airtime) { 3682 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3683 ieee80211_sta_update_pending_airtime(local, tx.sta, 3684 txq->ac, 3685 airtime, 3686 false); 3687 } 3688 } 3689 3690 return skb; 3691 3692 out: 3693 spin_unlock_bh(&fq->lock); 3694 3695 return skb; 3696 } 3697 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3698 3699 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3700 { 3701 struct ieee80211_local *local = hw_to_local(hw); 3702 struct ieee80211_txq *ret = NULL; 3703 struct txq_info *txqi = NULL, *head = NULL; 3704 bool found_eligible_txq = false; 3705 3706 spin_lock_bh(&local->active_txq_lock[ac]); 3707 3708 begin: 3709 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3710 struct txq_info, 3711 schedule_order); 3712 if (!txqi) 3713 goto out; 3714 3715 if (txqi == head) { 3716 if (!found_eligible_txq) 3717 goto out; 3718 else 3719 found_eligible_txq = false; 3720 } 3721 3722 if (!head) 3723 head = txqi; 3724 3725 if (txqi->txq.sta) { 3726 struct sta_info *sta = container_of(txqi->txq.sta, 3727 struct sta_info, sta); 3728 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3729 s64 deficit = sta->airtime[txqi->txq.ac].deficit; 3730 3731 if (aql_check) 3732 found_eligible_txq = true; 3733 3734 if (deficit < 0) 3735 sta->airtime[txqi->txq.ac].deficit += 3736 sta->airtime_weight; 3737 3738 if (deficit < 0 || !aql_check) { 3739 list_move_tail(&txqi->schedule_order, 3740 &local->active_txqs[txqi->txq.ac]); 3741 goto begin; 3742 } 3743 } 3744 3745 3746 if (txqi->schedule_round == local->schedule_round[ac]) 3747 goto out; 3748 3749 list_del_init(&txqi->schedule_order); 3750 txqi->schedule_round = local->schedule_round[ac]; 3751 ret = &txqi->txq; 3752 3753 out: 3754 spin_unlock_bh(&local->active_txq_lock[ac]); 3755 return ret; 3756 } 3757 EXPORT_SYMBOL(ieee80211_next_txq); 3758 3759 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3760 struct ieee80211_txq *txq, 3761 bool force) 3762 { 3763 struct ieee80211_local *local = hw_to_local(hw); 3764 struct txq_info *txqi = to_txq_info(txq); 3765 3766 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3767 3768 if (list_empty(&txqi->schedule_order) && 3769 (force || !skb_queue_empty(&txqi->frags) || 3770 txqi->tin.backlog_packets)) { 3771 /* If airtime accounting is active, always enqueue STAs at the 3772 * head of the list to ensure that they only get moved to the 3773 * back by the airtime DRR scheduler once they have a negative 3774 * deficit. A station that already has a negative deficit will 3775 * get immediately moved to the back of the list on the next 3776 * call to ieee80211_next_txq(). 3777 */ 3778 if (txqi->txq.sta && 3779 wiphy_ext_feature_isset(local->hw.wiphy, 3780 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3781 list_add(&txqi->schedule_order, 3782 &local->active_txqs[txq->ac]); 3783 else 3784 list_add_tail(&txqi->schedule_order, 3785 &local->active_txqs[txq->ac]); 3786 } 3787 3788 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3789 } 3790 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3791 3792 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3793 struct ieee80211_txq *txq) 3794 { 3795 struct sta_info *sta; 3796 struct ieee80211_local *local = hw_to_local(hw); 3797 3798 if (!(local->airtime_flags & AIRTIME_USE_AQL)) 3799 return true; 3800 3801 if (!txq->sta) 3802 return true; 3803 3804 sta = container_of(txq->sta, struct sta_info, sta); 3805 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3806 sta->airtime[txq->ac].aql_limit_low) 3807 return true; 3808 3809 if (atomic_read(&local->aql_total_pending_airtime) < 3810 local->aql_threshold && 3811 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3812 sta->airtime[txq->ac].aql_limit_high) 3813 return true; 3814 3815 return false; 3816 } 3817 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3818 3819 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3820 struct ieee80211_txq *txq) 3821 { 3822 struct ieee80211_local *local = hw_to_local(hw); 3823 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3824 struct sta_info *sta; 3825 u8 ac = txq->ac; 3826 3827 spin_lock_bh(&local->active_txq_lock[ac]); 3828 3829 if (!txqi->txq.sta) 3830 goto out; 3831 3832 if (list_empty(&txqi->schedule_order)) 3833 goto out; 3834 3835 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3836 schedule_order) { 3837 if (iter == txqi) 3838 break; 3839 3840 if (!iter->txq.sta) { 3841 list_move_tail(&iter->schedule_order, 3842 &local->active_txqs[ac]); 3843 continue; 3844 } 3845 sta = container_of(iter->txq.sta, struct sta_info, sta); 3846 if (sta->airtime[ac].deficit < 0) 3847 sta->airtime[ac].deficit += sta->airtime_weight; 3848 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3849 } 3850 3851 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3852 if (sta->airtime[ac].deficit >= 0) 3853 goto out; 3854 3855 sta->airtime[ac].deficit += sta->airtime_weight; 3856 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3857 spin_unlock_bh(&local->active_txq_lock[ac]); 3858 3859 return false; 3860 out: 3861 if (!list_empty(&txqi->schedule_order)) 3862 list_del_init(&txqi->schedule_order); 3863 spin_unlock_bh(&local->active_txq_lock[ac]); 3864 3865 return true; 3866 } 3867 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3868 3869 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3870 { 3871 struct ieee80211_local *local = hw_to_local(hw); 3872 3873 spin_lock_bh(&local->active_txq_lock[ac]); 3874 local->schedule_round[ac]++; 3875 spin_unlock_bh(&local->active_txq_lock[ac]); 3876 } 3877 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3878 3879 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3880 struct net_device *dev, 3881 u32 info_flags, 3882 u32 ctrl_flags) 3883 { 3884 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3885 struct ieee80211_local *local = sdata->local; 3886 struct sta_info *sta; 3887 struct sk_buff *next; 3888 3889 if (unlikely(skb->len < ETH_HLEN)) { 3890 kfree_skb(skb); 3891 return; 3892 } 3893 3894 rcu_read_lock(); 3895 3896 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3897 goto out_free; 3898 3899 if (IS_ERR(sta)) 3900 sta = NULL; 3901 3902 if (local->ops->wake_tx_queue) { 3903 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3904 skb_set_queue_mapping(skb, queue); 3905 } 3906 3907 if (sta) { 3908 struct ieee80211_fast_tx *fast_tx; 3909 3910 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3911 3912 fast_tx = rcu_dereference(sta->fast_tx); 3913 3914 if (fast_tx && 3915 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3916 goto out; 3917 } 3918 3919 if (skb_is_gso(skb)) { 3920 struct sk_buff *segs; 3921 3922 segs = skb_gso_segment(skb, 0); 3923 if (IS_ERR(segs)) { 3924 goto out_free; 3925 } else if (segs) { 3926 consume_skb(skb); 3927 skb = segs; 3928 } 3929 } else { 3930 /* we cannot process non-linear frames on this path */ 3931 if (skb_linearize(skb)) { 3932 kfree_skb(skb); 3933 goto out; 3934 } 3935 3936 /* the frame could be fragmented, software-encrypted, and other 3937 * things so we cannot really handle checksum offload with it - 3938 * fix it up in software before we handle anything else. 3939 */ 3940 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3941 skb_set_transport_header(skb, 3942 skb_checksum_start_offset(skb)); 3943 if (skb_checksum_help(skb)) 3944 goto out_free; 3945 } 3946 } 3947 3948 next = skb; 3949 while (next) { 3950 skb = next; 3951 next = skb->next; 3952 3953 skb->prev = NULL; 3954 skb->next = NULL; 3955 3956 skb = ieee80211_build_hdr(sdata, skb, info_flags, 3957 sta, ctrl_flags); 3958 if (IS_ERR(skb)) 3959 goto out; 3960 3961 ieee80211_tx_stats(dev, skb->len); 3962 3963 ieee80211_xmit(sdata, sta, skb, 0); 3964 } 3965 goto out; 3966 out_free: 3967 kfree_skb(skb); 3968 out: 3969 rcu_read_unlock(); 3970 } 3971 3972 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3973 { 3974 struct ethhdr *eth; 3975 int err; 3976 3977 err = skb_ensure_writable(skb, ETH_HLEN); 3978 if (unlikely(err)) 3979 return err; 3980 3981 eth = (void *)skb->data; 3982 ether_addr_copy(eth->h_dest, sta->sta.addr); 3983 3984 return 0; 3985 } 3986 3987 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3988 struct net_device *dev) 3989 { 3990 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3991 const struct ethhdr *eth = (void *)skb->data; 3992 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3993 __be16 ethertype; 3994 3995 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3996 return false; 3997 3998 switch (sdata->vif.type) { 3999 case NL80211_IFTYPE_AP_VLAN: 4000 if (sdata->u.vlan.sta) 4001 return false; 4002 if (sdata->wdev.use_4addr) 4003 return false; 4004 /* fall through */ 4005 case NL80211_IFTYPE_AP: 4006 /* check runtime toggle for this bss */ 4007 if (!sdata->bss->multicast_to_unicast) 4008 return false; 4009 break; 4010 default: 4011 return false; 4012 } 4013 4014 /* multicast to unicast conversion only for some payload */ 4015 ethertype = eth->h_proto; 4016 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4017 ethertype = ethvlan->h_vlan_encapsulated_proto; 4018 switch (ethertype) { 4019 case htons(ETH_P_ARP): 4020 case htons(ETH_P_IP): 4021 case htons(ETH_P_IPV6): 4022 break; 4023 default: 4024 return false; 4025 } 4026 4027 return true; 4028 } 4029 4030 static void 4031 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4032 struct sk_buff_head *queue) 4033 { 4034 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4035 struct ieee80211_local *local = sdata->local; 4036 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4037 struct sta_info *sta, *first = NULL; 4038 struct sk_buff *cloned_skb; 4039 4040 rcu_read_lock(); 4041 4042 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4043 if (sdata != sta->sdata) 4044 /* AP-VLAN mismatch */ 4045 continue; 4046 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4047 /* do not send back to source */ 4048 continue; 4049 if (!first) { 4050 first = sta; 4051 continue; 4052 } 4053 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4054 if (!cloned_skb) 4055 goto multicast; 4056 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4057 dev_kfree_skb(cloned_skb); 4058 goto multicast; 4059 } 4060 __skb_queue_tail(queue, cloned_skb); 4061 } 4062 4063 if (likely(first)) { 4064 if (unlikely(ieee80211_change_da(skb, first))) 4065 goto multicast; 4066 __skb_queue_tail(queue, skb); 4067 } else { 4068 /* no STA connected, drop */ 4069 kfree_skb(skb); 4070 skb = NULL; 4071 } 4072 4073 goto out; 4074 multicast: 4075 __skb_queue_purge(queue); 4076 __skb_queue_tail(queue, skb); 4077 out: 4078 rcu_read_unlock(); 4079 } 4080 4081 /** 4082 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4083 * @skb: packet to be sent 4084 * @dev: incoming interface 4085 * 4086 * On failure skb will be freed. 4087 */ 4088 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4089 struct net_device *dev) 4090 { 4091 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4092 struct sk_buff_head queue; 4093 4094 __skb_queue_head_init(&queue); 4095 ieee80211_convert_to_unicast(skb, dev, &queue); 4096 while ((skb = __skb_dequeue(&queue))) 4097 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4098 } else { 4099 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4100 } 4101 4102 return NETDEV_TX_OK; 4103 } 4104 4105 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4106 struct sk_buff *skb, int led_len, 4107 struct sta_info *sta, 4108 bool txpending) 4109 { 4110 struct ieee80211_local *local = sdata->local; 4111 struct ieee80211_tx_control control = {}; 4112 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4113 struct ieee80211_sta *pubsta = NULL; 4114 unsigned long flags; 4115 int q = info->hw_queue; 4116 4117 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4118 return true; 4119 4120 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4121 4122 if (local->queue_stop_reasons[q] || 4123 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4124 if (txpending) 4125 skb_queue_head(&local->pending[q], skb); 4126 else 4127 skb_queue_tail(&local->pending[q], skb); 4128 4129 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4130 4131 return false; 4132 } 4133 4134 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4135 4136 if (sta && sta->uploaded) 4137 pubsta = &sta->sta; 4138 4139 control.sta = pubsta; 4140 4141 drv_tx(local, &control, skb); 4142 4143 return true; 4144 } 4145 4146 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4147 struct net_device *dev, struct sta_info *sta, 4148 struct sk_buff *skb) 4149 { 4150 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4151 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4152 struct ieee80211_local *local = sdata->local; 4153 bool authorized = false; 4154 bool multicast; 4155 unsigned char *ra = ehdr->h_dest; 4156 4157 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4158 sta = NULL; 4159 4160 if (sdata->vif.type == NL80211_IFTYPE_STATION && 4161 (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER))) 4162 ra = sdata->u.mgd.bssid; 4163 4164 if (!is_valid_ether_addr(ra)) 4165 goto out_free; 4166 4167 multicast = is_multicast_ether_addr(ra); 4168 4169 if (sta) 4170 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 4171 4172 if (!multicast && !authorized && 4173 (ehdr->h_proto != sdata->control_port_protocol || 4174 !ether_addr_equal(sdata->vif.addr, ehdr->h_source))) 4175 goto out_free; 4176 4177 if (multicast && sdata->vif.type == NL80211_IFTYPE_AP && 4178 !atomic_read(&sdata->u.ap.num_mcast_sta)) 4179 goto out_free; 4180 4181 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4182 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4183 goto out_free; 4184 4185 if (unlikely(!multicast && skb->sk && 4186 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4187 ieee80211_store_ack_skb(local, skb, &info->flags); 4188 4189 memset(info, 0, sizeof(*info)); 4190 4191 if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) { 4192 if (sdata->control_port_no_encrypt) 4193 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4194 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 4195 } 4196 4197 if (multicast) 4198 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4199 4200 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4201 4202 ieee80211_tx_stats(dev, skb->len); 4203 4204 if (sta) { 4205 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4206 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 4207 } 4208 4209 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4210 sdata = container_of(sdata->bss, 4211 struct ieee80211_sub_if_data, u.ap); 4212 4213 info->control.flags |= IEEE80211_TX_CTRL_HW_80211_ENCAP; 4214 info->control.vif = &sdata->vif; 4215 4216 ieee80211_tx_8023(sdata, skb, skb->len, sta, false); 4217 4218 return; 4219 4220 out_free: 4221 kfree_skb(skb); 4222 } 4223 4224 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4225 struct net_device *dev) 4226 { 4227 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4228 struct sta_info *sta; 4229 4230 if (WARN_ON(!sdata->hw_80211_encap)) { 4231 kfree_skb(skb); 4232 return NETDEV_TX_OK; 4233 } 4234 4235 if (unlikely(skb->len < ETH_HLEN)) { 4236 kfree_skb(skb); 4237 return NETDEV_TX_OK; 4238 } 4239 4240 rcu_read_lock(); 4241 4242 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4243 kfree_skb(skb); 4244 else 4245 ieee80211_8023_xmit(sdata, dev, sta, skb); 4246 4247 rcu_read_unlock(); 4248 4249 return NETDEV_TX_OK; 4250 } 4251 4252 struct sk_buff * 4253 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4254 struct sk_buff *skb, u32 info_flags) 4255 { 4256 struct ieee80211_hdr *hdr; 4257 struct ieee80211_tx_data tx = { 4258 .local = sdata->local, 4259 .sdata = sdata, 4260 }; 4261 struct sta_info *sta; 4262 4263 rcu_read_lock(); 4264 4265 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4266 kfree_skb(skb); 4267 skb = ERR_PTR(-EINVAL); 4268 goto out; 4269 } 4270 4271 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0); 4272 if (IS_ERR(skb)) 4273 goto out; 4274 4275 hdr = (void *)skb->data; 4276 tx.sta = sta_info_get(sdata, hdr->addr1); 4277 tx.skb = skb; 4278 4279 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4280 rcu_read_unlock(); 4281 kfree_skb(skb); 4282 return ERR_PTR(-EINVAL); 4283 } 4284 4285 out: 4286 rcu_read_unlock(); 4287 return skb; 4288 } 4289 4290 /* 4291 * ieee80211_clear_tx_pending may not be called in a context where 4292 * it is possible that it packets could come in again. 4293 */ 4294 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4295 { 4296 struct sk_buff *skb; 4297 int i; 4298 4299 for (i = 0; i < local->hw.queues; i++) { 4300 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4301 ieee80211_free_txskb(&local->hw, skb); 4302 } 4303 } 4304 4305 /* 4306 * Returns false if the frame couldn't be transmitted but was queued instead, 4307 * which in this case means re-queued -- take as an indication to stop sending 4308 * more pending frames. 4309 */ 4310 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4311 struct sk_buff *skb) 4312 { 4313 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4314 struct ieee80211_sub_if_data *sdata; 4315 struct sta_info *sta; 4316 struct ieee80211_hdr *hdr; 4317 bool result; 4318 struct ieee80211_chanctx_conf *chanctx_conf; 4319 4320 sdata = vif_to_sdata(info->control.vif); 4321 4322 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 4323 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4324 if (unlikely(!chanctx_conf)) { 4325 dev_kfree_skb(skb); 4326 return true; 4327 } 4328 info->band = chanctx_conf->def.chan->band; 4329 result = ieee80211_tx(sdata, NULL, skb, true, 0); 4330 } else if (info->control.flags & IEEE80211_TX_CTRL_HW_80211_ENCAP) { 4331 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4332 dev_kfree_skb(skb); 4333 return true; 4334 } 4335 4336 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4337 sta = NULL; 4338 4339 result = ieee80211_tx_8023(sdata, skb, skb->len, sta, true); 4340 } else { 4341 struct sk_buff_head skbs; 4342 4343 __skb_queue_head_init(&skbs); 4344 __skb_queue_tail(&skbs, skb); 4345 4346 hdr = (struct ieee80211_hdr *)skb->data; 4347 sta = sta_info_get(sdata, hdr->addr1); 4348 4349 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4350 } 4351 4352 return result; 4353 } 4354 4355 /* 4356 * Transmit all pending packets. Called from tasklet. 4357 */ 4358 void ieee80211_tx_pending(unsigned long data) 4359 { 4360 struct ieee80211_local *local = (struct ieee80211_local *)data; 4361 unsigned long flags; 4362 int i; 4363 bool txok; 4364 4365 rcu_read_lock(); 4366 4367 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4368 for (i = 0; i < local->hw.queues; i++) { 4369 /* 4370 * If queue is stopped by something other than due to pending 4371 * frames, or we have no pending frames, proceed to next queue. 4372 */ 4373 if (local->queue_stop_reasons[i] || 4374 skb_queue_empty(&local->pending[i])) 4375 continue; 4376 4377 while (!skb_queue_empty(&local->pending[i])) { 4378 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4379 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4380 4381 if (WARN_ON(!info->control.vif)) { 4382 ieee80211_free_txskb(&local->hw, skb); 4383 continue; 4384 } 4385 4386 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4387 flags); 4388 4389 txok = ieee80211_tx_pending_skb(local, skb); 4390 spin_lock_irqsave(&local->queue_stop_reason_lock, 4391 flags); 4392 if (!txok) 4393 break; 4394 } 4395 4396 if (skb_queue_empty(&local->pending[i])) 4397 ieee80211_propagate_queue_wake(local, i); 4398 } 4399 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4400 4401 rcu_read_unlock(); 4402 } 4403 4404 /* functions for drivers to get certain frames */ 4405 4406 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4407 struct ps_data *ps, struct sk_buff *skb, 4408 bool is_template) 4409 { 4410 u8 *pos, *tim; 4411 int aid0 = 0; 4412 int i, have_bits = 0, n1, n2; 4413 4414 /* Generate bitmap for TIM only if there are any STAs in power save 4415 * mode. */ 4416 if (atomic_read(&ps->num_sta_ps) > 0) 4417 /* in the hope that this is faster than 4418 * checking byte-for-byte */ 4419 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4420 IEEE80211_MAX_AID+1); 4421 if (!is_template) { 4422 if (ps->dtim_count == 0) 4423 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4424 else 4425 ps->dtim_count--; 4426 } 4427 4428 tim = pos = skb_put(skb, 6); 4429 *pos++ = WLAN_EID_TIM; 4430 *pos++ = 4; 4431 *pos++ = ps->dtim_count; 4432 *pos++ = sdata->vif.bss_conf.dtim_period; 4433 4434 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4435 aid0 = 1; 4436 4437 ps->dtim_bc_mc = aid0 == 1; 4438 4439 if (have_bits) { 4440 /* Find largest even number N1 so that bits numbered 1 through 4441 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4442 * (N2 + 1) x 8 through 2007 are 0. */ 4443 n1 = 0; 4444 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4445 if (ps->tim[i]) { 4446 n1 = i & 0xfe; 4447 break; 4448 } 4449 } 4450 n2 = n1; 4451 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4452 if (ps->tim[i]) { 4453 n2 = i; 4454 break; 4455 } 4456 } 4457 4458 /* Bitmap control */ 4459 *pos++ = n1 | aid0; 4460 /* Part Virt Bitmap */ 4461 skb_put(skb, n2 - n1); 4462 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4463 4464 tim[1] = n2 - n1 + 4; 4465 } else { 4466 *pos++ = aid0; /* Bitmap control */ 4467 *pos++ = 0; /* Part Virt Bitmap */ 4468 } 4469 } 4470 4471 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4472 struct ps_data *ps, struct sk_buff *skb, 4473 bool is_template) 4474 { 4475 struct ieee80211_local *local = sdata->local; 4476 4477 /* 4478 * Not very nice, but we want to allow the driver to call 4479 * ieee80211_beacon_get() as a response to the set_tim() 4480 * callback. That, however, is already invoked under the 4481 * sta_lock to guarantee consistent and race-free update 4482 * of the tim bitmap in mac80211 and the driver. 4483 */ 4484 if (local->tim_in_locked_section) { 4485 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4486 } else { 4487 spin_lock_bh(&local->tim_lock); 4488 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4489 spin_unlock_bh(&local->tim_lock); 4490 } 4491 4492 return 0; 4493 } 4494 4495 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4496 struct beacon_data *beacon) 4497 { 4498 struct probe_resp *resp; 4499 u8 *beacon_data; 4500 size_t beacon_data_len; 4501 int i; 4502 u8 count = beacon->csa_current_counter; 4503 4504 switch (sdata->vif.type) { 4505 case NL80211_IFTYPE_AP: 4506 beacon_data = beacon->tail; 4507 beacon_data_len = beacon->tail_len; 4508 break; 4509 case NL80211_IFTYPE_ADHOC: 4510 beacon_data = beacon->head; 4511 beacon_data_len = beacon->head_len; 4512 break; 4513 case NL80211_IFTYPE_MESH_POINT: 4514 beacon_data = beacon->head; 4515 beacon_data_len = beacon->head_len; 4516 break; 4517 default: 4518 return; 4519 } 4520 4521 rcu_read_lock(); 4522 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4523 resp = rcu_dereference(sdata->u.ap.probe_resp); 4524 4525 if (beacon->csa_counter_offsets[i]) { 4526 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4527 beacon_data_len)) { 4528 rcu_read_unlock(); 4529 return; 4530 } 4531 4532 beacon_data[beacon->csa_counter_offsets[i]] = count; 4533 } 4534 4535 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4536 resp->data[resp->csa_counter_offsets[i]] = count; 4537 } 4538 rcu_read_unlock(); 4539 } 4540 4541 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4542 { 4543 beacon->csa_current_counter--; 4544 4545 /* the counter should never reach 0 */ 4546 WARN_ON_ONCE(!beacon->csa_current_counter); 4547 4548 return beacon->csa_current_counter; 4549 } 4550 4551 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4552 { 4553 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4554 struct beacon_data *beacon = NULL; 4555 u8 count = 0; 4556 4557 rcu_read_lock(); 4558 4559 if (sdata->vif.type == NL80211_IFTYPE_AP) 4560 beacon = rcu_dereference(sdata->u.ap.beacon); 4561 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4562 beacon = rcu_dereference(sdata->u.ibss.presp); 4563 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4564 beacon = rcu_dereference(sdata->u.mesh.beacon); 4565 4566 if (!beacon) 4567 goto unlock; 4568 4569 count = __ieee80211_csa_update_counter(beacon); 4570 4571 unlock: 4572 rcu_read_unlock(); 4573 return count; 4574 } 4575 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4576 4577 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4578 { 4579 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4580 struct beacon_data *beacon = NULL; 4581 4582 rcu_read_lock(); 4583 4584 if (sdata->vif.type == NL80211_IFTYPE_AP) 4585 beacon = rcu_dereference(sdata->u.ap.beacon); 4586 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4587 beacon = rcu_dereference(sdata->u.ibss.presp); 4588 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4589 beacon = rcu_dereference(sdata->u.mesh.beacon); 4590 4591 if (!beacon) 4592 goto unlock; 4593 4594 if (counter < beacon->csa_current_counter) 4595 beacon->csa_current_counter = counter; 4596 4597 unlock: 4598 rcu_read_unlock(); 4599 } 4600 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4601 4602 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4603 { 4604 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4605 struct beacon_data *beacon = NULL; 4606 u8 *beacon_data; 4607 size_t beacon_data_len; 4608 int ret = false; 4609 4610 if (!ieee80211_sdata_running(sdata)) 4611 return false; 4612 4613 rcu_read_lock(); 4614 if (vif->type == NL80211_IFTYPE_AP) { 4615 struct ieee80211_if_ap *ap = &sdata->u.ap; 4616 4617 beacon = rcu_dereference(ap->beacon); 4618 if (WARN_ON(!beacon || !beacon->tail)) 4619 goto out; 4620 beacon_data = beacon->tail; 4621 beacon_data_len = beacon->tail_len; 4622 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4623 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4624 4625 beacon = rcu_dereference(ifibss->presp); 4626 if (!beacon) 4627 goto out; 4628 4629 beacon_data = beacon->head; 4630 beacon_data_len = beacon->head_len; 4631 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4632 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4633 4634 beacon = rcu_dereference(ifmsh->beacon); 4635 if (!beacon) 4636 goto out; 4637 4638 beacon_data = beacon->head; 4639 beacon_data_len = beacon->head_len; 4640 } else { 4641 WARN_ON(1); 4642 goto out; 4643 } 4644 4645 if (!beacon->csa_counter_offsets[0]) 4646 goto out; 4647 4648 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4649 goto out; 4650 4651 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4652 ret = true; 4653 out: 4654 rcu_read_unlock(); 4655 4656 return ret; 4657 } 4658 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4659 4660 static struct sk_buff * 4661 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4662 struct ieee80211_vif *vif, 4663 struct ieee80211_mutable_offsets *offs, 4664 bool is_template) 4665 { 4666 struct ieee80211_local *local = hw_to_local(hw); 4667 struct beacon_data *beacon = NULL; 4668 struct sk_buff *skb = NULL; 4669 struct ieee80211_tx_info *info; 4670 struct ieee80211_sub_if_data *sdata = NULL; 4671 enum nl80211_band band; 4672 struct ieee80211_tx_rate_control txrc; 4673 struct ieee80211_chanctx_conf *chanctx_conf; 4674 int csa_off_base = 0; 4675 4676 rcu_read_lock(); 4677 4678 sdata = vif_to_sdata(vif); 4679 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4680 4681 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4682 goto out; 4683 4684 if (offs) 4685 memset(offs, 0, sizeof(*offs)); 4686 4687 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4688 struct ieee80211_if_ap *ap = &sdata->u.ap; 4689 4690 beacon = rcu_dereference(ap->beacon); 4691 if (beacon) { 4692 if (beacon->csa_counter_offsets[0]) { 4693 if (!is_template) 4694 __ieee80211_csa_update_counter(beacon); 4695 4696 ieee80211_set_csa(sdata, beacon); 4697 } 4698 4699 /* 4700 * headroom, head length, 4701 * tail length and maximum TIM length 4702 */ 4703 skb = dev_alloc_skb(local->tx_headroom + 4704 beacon->head_len + 4705 beacon->tail_len + 256 + 4706 local->hw.extra_beacon_tailroom); 4707 if (!skb) 4708 goto out; 4709 4710 skb_reserve(skb, local->tx_headroom); 4711 skb_put_data(skb, beacon->head, beacon->head_len); 4712 4713 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4714 is_template); 4715 4716 if (offs) { 4717 offs->tim_offset = beacon->head_len; 4718 offs->tim_length = skb->len - beacon->head_len; 4719 4720 /* for AP the csa offsets are from tail */ 4721 csa_off_base = skb->len; 4722 } 4723 4724 if (beacon->tail) 4725 skb_put_data(skb, beacon->tail, 4726 beacon->tail_len); 4727 } else 4728 goto out; 4729 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4730 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4731 struct ieee80211_hdr *hdr; 4732 4733 beacon = rcu_dereference(ifibss->presp); 4734 if (!beacon) 4735 goto out; 4736 4737 if (beacon->csa_counter_offsets[0]) { 4738 if (!is_template) 4739 __ieee80211_csa_update_counter(beacon); 4740 4741 ieee80211_set_csa(sdata, beacon); 4742 } 4743 4744 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4745 local->hw.extra_beacon_tailroom); 4746 if (!skb) 4747 goto out; 4748 skb_reserve(skb, local->tx_headroom); 4749 skb_put_data(skb, beacon->head, beacon->head_len); 4750 4751 hdr = (struct ieee80211_hdr *) skb->data; 4752 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4753 IEEE80211_STYPE_BEACON); 4754 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4755 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4756 4757 beacon = rcu_dereference(ifmsh->beacon); 4758 if (!beacon) 4759 goto out; 4760 4761 if (beacon->csa_counter_offsets[0]) { 4762 if (!is_template) 4763 /* TODO: For mesh csa_counter is in TU, so 4764 * decrementing it by one isn't correct, but 4765 * for now we leave it consistent with overall 4766 * mac80211's behavior. 4767 */ 4768 __ieee80211_csa_update_counter(beacon); 4769 4770 ieee80211_set_csa(sdata, beacon); 4771 } 4772 4773 if (ifmsh->sync_ops) 4774 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4775 4776 skb = dev_alloc_skb(local->tx_headroom + 4777 beacon->head_len + 4778 256 + /* TIM IE */ 4779 beacon->tail_len + 4780 local->hw.extra_beacon_tailroom); 4781 if (!skb) 4782 goto out; 4783 skb_reserve(skb, local->tx_headroom); 4784 skb_put_data(skb, beacon->head, beacon->head_len); 4785 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4786 4787 if (offs) { 4788 offs->tim_offset = beacon->head_len; 4789 offs->tim_length = skb->len - beacon->head_len; 4790 } 4791 4792 skb_put_data(skb, beacon->tail, beacon->tail_len); 4793 } else { 4794 WARN_ON(1); 4795 goto out; 4796 } 4797 4798 /* CSA offsets */ 4799 if (offs && beacon) { 4800 int i; 4801 4802 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4803 u16 csa_off = beacon->csa_counter_offsets[i]; 4804 4805 if (!csa_off) 4806 continue; 4807 4808 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4809 } 4810 } 4811 4812 band = chanctx_conf->def.chan->band; 4813 4814 info = IEEE80211_SKB_CB(skb); 4815 4816 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4817 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4818 info->band = band; 4819 4820 memset(&txrc, 0, sizeof(txrc)); 4821 txrc.hw = hw; 4822 txrc.sband = local->hw.wiphy->bands[band]; 4823 txrc.bss_conf = &sdata->vif.bss_conf; 4824 txrc.skb = skb; 4825 txrc.reported_rate.idx = -1; 4826 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4827 txrc.bss = true; 4828 rate_control_get_rate(sdata, NULL, &txrc); 4829 4830 info->control.vif = vif; 4831 4832 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4833 IEEE80211_TX_CTL_ASSIGN_SEQ | 4834 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4835 out: 4836 rcu_read_unlock(); 4837 return skb; 4838 4839 } 4840 4841 struct sk_buff * 4842 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4843 struct ieee80211_vif *vif, 4844 struct ieee80211_mutable_offsets *offs) 4845 { 4846 return __ieee80211_beacon_get(hw, vif, offs, true); 4847 } 4848 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4849 4850 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4851 struct ieee80211_vif *vif, 4852 u16 *tim_offset, u16 *tim_length) 4853 { 4854 struct ieee80211_mutable_offsets offs = {}; 4855 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4856 struct sk_buff *copy; 4857 struct ieee80211_supported_band *sband; 4858 int shift; 4859 4860 if (!bcn) 4861 return bcn; 4862 4863 if (tim_offset) 4864 *tim_offset = offs.tim_offset; 4865 4866 if (tim_length) 4867 *tim_length = offs.tim_length; 4868 4869 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4870 !hw_to_local(hw)->monitors) 4871 return bcn; 4872 4873 /* send a copy to monitor interfaces */ 4874 copy = skb_copy(bcn, GFP_ATOMIC); 4875 if (!copy) 4876 return bcn; 4877 4878 shift = ieee80211_vif_get_shift(vif); 4879 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4880 if (!sband) 4881 return bcn; 4882 4883 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4884 NULL); 4885 4886 return bcn; 4887 } 4888 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4889 4890 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4891 struct ieee80211_vif *vif) 4892 { 4893 struct ieee80211_if_ap *ap = NULL; 4894 struct sk_buff *skb = NULL; 4895 struct probe_resp *presp = NULL; 4896 struct ieee80211_hdr *hdr; 4897 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4898 4899 if (sdata->vif.type != NL80211_IFTYPE_AP) 4900 return NULL; 4901 4902 rcu_read_lock(); 4903 4904 ap = &sdata->u.ap; 4905 presp = rcu_dereference(ap->probe_resp); 4906 if (!presp) 4907 goto out; 4908 4909 skb = dev_alloc_skb(presp->len); 4910 if (!skb) 4911 goto out; 4912 4913 skb_put_data(skb, presp->data, presp->len); 4914 4915 hdr = (struct ieee80211_hdr *) skb->data; 4916 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4917 4918 out: 4919 rcu_read_unlock(); 4920 return skb; 4921 } 4922 EXPORT_SYMBOL(ieee80211_proberesp_get); 4923 4924 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4925 struct ieee80211_vif *vif) 4926 { 4927 struct ieee80211_sub_if_data *sdata; 4928 struct ieee80211_if_managed *ifmgd; 4929 struct ieee80211_pspoll *pspoll; 4930 struct ieee80211_local *local; 4931 struct sk_buff *skb; 4932 4933 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4934 return NULL; 4935 4936 sdata = vif_to_sdata(vif); 4937 ifmgd = &sdata->u.mgd; 4938 local = sdata->local; 4939 4940 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4941 if (!skb) 4942 return NULL; 4943 4944 skb_reserve(skb, local->hw.extra_tx_headroom); 4945 4946 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4947 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4948 IEEE80211_STYPE_PSPOLL); 4949 pspoll->aid = cpu_to_le16(ifmgd->aid); 4950 4951 /* aid in PS-Poll has its two MSBs each set to 1 */ 4952 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4953 4954 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4955 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4956 4957 return skb; 4958 } 4959 EXPORT_SYMBOL(ieee80211_pspoll_get); 4960 4961 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4962 struct ieee80211_vif *vif, 4963 bool qos_ok) 4964 { 4965 struct ieee80211_hdr_3addr *nullfunc; 4966 struct ieee80211_sub_if_data *sdata; 4967 struct ieee80211_if_managed *ifmgd; 4968 struct ieee80211_local *local; 4969 struct sk_buff *skb; 4970 bool qos = false; 4971 4972 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4973 return NULL; 4974 4975 sdata = vif_to_sdata(vif); 4976 ifmgd = &sdata->u.mgd; 4977 local = sdata->local; 4978 4979 if (qos_ok) { 4980 struct sta_info *sta; 4981 4982 rcu_read_lock(); 4983 sta = sta_info_get(sdata, ifmgd->bssid); 4984 qos = sta && sta->sta.wme; 4985 rcu_read_unlock(); 4986 } 4987 4988 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4989 sizeof(*nullfunc) + 2); 4990 if (!skb) 4991 return NULL; 4992 4993 skb_reserve(skb, local->hw.extra_tx_headroom); 4994 4995 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4996 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4997 IEEE80211_STYPE_NULLFUNC | 4998 IEEE80211_FCTL_TODS); 4999 if (qos) { 5000 __le16 qoshdr = cpu_to_le16(7); 5001 5002 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5003 IEEE80211_STYPE_NULLFUNC) != 5004 IEEE80211_STYPE_QOS_NULLFUNC); 5005 nullfunc->frame_control |= 5006 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5007 skb->priority = 7; 5008 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5009 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5010 } 5011 5012 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 5013 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5014 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 5015 5016 return skb; 5017 } 5018 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5019 5020 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5021 const u8 *src_addr, 5022 const u8 *ssid, size_t ssid_len, 5023 size_t tailroom) 5024 { 5025 struct ieee80211_local *local = hw_to_local(hw); 5026 struct ieee80211_hdr_3addr *hdr; 5027 struct sk_buff *skb; 5028 size_t ie_ssid_len; 5029 u8 *pos; 5030 5031 ie_ssid_len = 2 + ssid_len; 5032 5033 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5034 ie_ssid_len + tailroom); 5035 if (!skb) 5036 return NULL; 5037 5038 skb_reserve(skb, local->hw.extra_tx_headroom); 5039 5040 hdr = skb_put_zero(skb, sizeof(*hdr)); 5041 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5042 IEEE80211_STYPE_PROBE_REQ); 5043 eth_broadcast_addr(hdr->addr1); 5044 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5045 eth_broadcast_addr(hdr->addr3); 5046 5047 pos = skb_put(skb, ie_ssid_len); 5048 *pos++ = WLAN_EID_SSID; 5049 *pos++ = ssid_len; 5050 if (ssid_len) 5051 memcpy(pos, ssid, ssid_len); 5052 pos += ssid_len; 5053 5054 return skb; 5055 } 5056 EXPORT_SYMBOL(ieee80211_probereq_get); 5057 5058 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5059 const void *frame, size_t frame_len, 5060 const struct ieee80211_tx_info *frame_txctl, 5061 struct ieee80211_rts *rts) 5062 { 5063 const struct ieee80211_hdr *hdr = frame; 5064 5065 rts->frame_control = 5066 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5067 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5068 frame_txctl); 5069 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5070 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5071 } 5072 EXPORT_SYMBOL(ieee80211_rts_get); 5073 5074 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5075 const void *frame, size_t frame_len, 5076 const struct ieee80211_tx_info *frame_txctl, 5077 struct ieee80211_cts *cts) 5078 { 5079 const struct ieee80211_hdr *hdr = frame; 5080 5081 cts->frame_control = 5082 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5083 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5084 frame_len, frame_txctl); 5085 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5086 } 5087 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5088 5089 struct sk_buff * 5090 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5091 struct ieee80211_vif *vif) 5092 { 5093 struct ieee80211_local *local = hw_to_local(hw); 5094 struct sk_buff *skb = NULL; 5095 struct ieee80211_tx_data tx; 5096 struct ieee80211_sub_if_data *sdata; 5097 struct ps_data *ps; 5098 struct ieee80211_tx_info *info; 5099 struct ieee80211_chanctx_conf *chanctx_conf; 5100 5101 sdata = vif_to_sdata(vif); 5102 5103 rcu_read_lock(); 5104 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 5105 5106 if (!chanctx_conf) 5107 goto out; 5108 5109 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5110 struct beacon_data *beacon = 5111 rcu_dereference(sdata->u.ap.beacon); 5112 5113 if (!beacon || !beacon->head) 5114 goto out; 5115 5116 ps = &sdata->u.ap.ps; 5117 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5118 ps = &sdata->u.mesh.ps; 5119 } else { 5120 goto out; 5121 } 5122 5123 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5124 goto out; /* send buffered bc/mc only after DTIM beacon */ 5125 5126 while (1) { 5127 skb = skb_dequeue(&ps->bc_buf); 5128 if (!skb) 5129 goto out; 5130 local->total_ps_buffered--; 5131 5132 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5133 struct ieee80211_hdr *hdr = 5134 (struct ieee80211_hdr *) skb->data; 5135 /* more buffered multicast/broadcast frames ==> set 5136 * MoreData flag in IEEE 802.11 header to inform PS 5137 * STAs */ 5138 hdr->frame_control |= 5139 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5140 } 5141 5142 if (sdata->vif.type == NL80211_IFTYPE_AP) 5143 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5144 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5145 break; 5146 ieee80211_free_txskb(hw, skb); 5147 } 5148 5149 info = IEEE80211_SKB_CB(skb); 5150 5151 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5152 info->band = chanctx_conf->def.chan->band; 5153 5154 if (invoke_tx_handlers(&tx)) 5155 skb = NULL; 5156 out: 5157 rcu_read_unlock(); 5158 5159 return skb; 5160 } 5161 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5162 5163 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5164 { 5165 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5166 struct ieee80211_sub_if_data *sdata = sta->sdata; 5167 struct ieee80211_local *local = sdata->local; 5168 int ret; 5169 u32 queues; 5170 5171 lockdep_assert_held(&local->sta_mtx); 5172 5173 /* only some cases are supported right now */ 5174 switch (sdata->vif.type) { 5175 case NL80211_IFTYPE_STATION: 5176 case NL80211_IFTYPE_AP: 5177 case NL80211_IFTYPE_AP_VLAN: 5178 break; 5179 default: 5180 WARN_ON(1); 5181 return -EINVAL; 5182 } 5183 5184 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5185 return -EINVAL; 5186 5187 if (sta->reserved_tid == tid) { 5188 ret = 0; 5189 goto out; 5190 } 5191 5192 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5193 sdata_err(sdata, "TID reservation already active\n"); 5194 ret = -EALREADY; 5195 goto out; 5196 } 5197 5198 ieee80211_stop_vif_queues(sdata->local, sdata, 5199 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5200 5201 synchronize_net(); 5202 5203 /* Tear down BA sessions so we stop aggregating on this TID */ 5204 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5205 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5206 __ieee80211_stop_tx_ba_session(sta, tid, 5207 AGG_STOP_LOCAL_REQUEST); 5208 } 5209 5210 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5211 __ieee80211_flush_queues(local, sdata, queues, false); 5212 5213 sta->reserved_tid = tid; 5214 5215 ieee80211_wake_vif_queues(local, sdata, 5216 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5217 5218 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5219 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5220 5221 ret = 0; 5222 out: 5223 return ret; 5224 } 5225 EXPORT_SYMBOL(ieee80211_reserve_tid); 5226 5227 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5228 { 5229 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5230 struct ieee80211_sub_if_data *sdata = sta->sdata; 5231 5232 lockdep_assert_held(&sdata->local->sta_mtx); 5233 5234 /* only some cases are supported right now */ 5235 switch (sdata->vif.type) { 5236 case NL80211_IFTYPE_STATION: 5237 case NL80211_IFTYPE_AP: 5238 case NL80211_IFTYPE_AP_VLAN: 5239 break; 5240 default: 5241 WARN_ON(1); 5242 return; 5243 } 5244 5245 if (tid != sta->reserved_tid) { 5246 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5247 return; 5248 } 5249 5250 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5251 } 5252 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5253 5254 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5255 struct sk_buff *skb, int tid, 5256 enum nl80211_band band, u32 txdata_flags) 5257 { 5258 int ac = ieee80211_ac_from_tid(tid); 5259 5260 skb_reset_mac_header(skb); 5261 skb_set_queue_mapping(skb, ac); 5262 skb->priority = tid; 5263 5264 skb->dev = sdata->dev; 5265 5266 /* 5267 * The other path calling ieee80211_xmit is from the tasklet, 5268 * and while we can handle concurrent transmissions locking 5269 * requirements are that we do not come into tx with bhs on. 5270 */ 5271 local_bh_disable(); 5272 IEEE80211_SKB_CB(skb)->band = band; 5273 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 5274 local_bh_enable(); 5275 } 5276 5277 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5278 const u8 *buf, size_t len, 5279 const u8 *dest, __be16 proto, bool unencrypted) 5280 { 5281 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5282 struct ieee80211_local *local = sdata->local; 5283 struct sk_buff *skb; 5284 struct ethhdr *ehdr; 5285 u32 flags; 5286 5287 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5288 * or Pre-Authentication 5289 */ 5290 if (proto != sdata->control_port_protocol && 5291 proto != cpu_to_be16(ETH_P_PREAUTH)) 5292 return -EINVAL; 5293 5294 if (unencrypted) 5295 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 5296 else 5297 flags = 0; 5298 5299 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5300 sizeof(struct ethhdr) + len); 5301 if (!skb) 5302 return -ENOMEM; 5303 5304 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5305 5306 skb_put_data(skb, buf, len); 5307 5308 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5309 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5310 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5311 ehdr->h_proto = proto; 5312 5313 skb->dev = dev; 5314 skb->protocol = htons(ETH_P_802_3); 5315 skb_reset_network_header(skb); 5316 skb_reset_mac_header(skb); 5317 5318 local_bh_disable(); 5319 __ieee80211_subif_start_xmit(skb, skb->dev, flags, 0); 5320 local_bh_enable(); 5321 5322 return 0; 5323 } 5324 5325 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5326 const u8 *buf, size_t len) 5327 { 5328 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5329 struct ieee80211_local *local = sdata->local; 5330 struct sk_buff *skb; 5331 5332 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5333 30 + /* header size */ 5334 18); /* 11s header size */ 5335 if (!skb) 5336 return -ENOMEM; 5337 5338 skb_reserve(skb, local->hw.extra_tx_headroom); 5339 skb_put_data(skb, buf, len); 5340 5341 skb->dev = dev; 5342 skb->protocol = htons(ETH_P_802_3); 5343 skb_reset_network_header(skb); 5344 skb_reset_mac_header(skb); 5345 5346 local_bh_disable(); 5347 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5348 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP); 5349 local_bh_enable(); 5350 5351 return 0; 5352 } 5353