1 /* 2 * Copyright 2002-2005, Instant802 Networks, Inc. 3 * Copyright 2005-2006, Devicescape Software, Inc. 4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 6 * Copyright 2013-2014 Intel Mobile Communications GmbH 7 * Copyright (C) 2018 Intel Corporation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * 14 * Transmit and frame generation functions. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/slab.h> 19 #include <linux/skbuff.h> 20 #include <linux/if_vlan.h> 21 #include <linux/etherdevice.h> 22 #include <linux/bitmap.h> 23 #include <linux/rcupdate.h> 24 #include <linux/export.h> 25 #include <net/net_namespace.h> 26 #include <net/ieee80211_radiotap.h> 27 #include <net/cfg80211.h> 28 #include <net/mac80211.h> 29 #include <net/codel.h> 30 #include <net/codel_impl.h> 31 #include <asm/unaligned.h> 32 #include <net/fq_impl.h> 33 34 #include "ieee80211_i.h" 35 #include "driver-ops.h" 36 #include "led.h" 37 #include "mesh.h" 38 #include "wep.h" 39 #include "wpa.h" 40 #include "wme.h" 41 #include "rate.h" 42 43 /* misc utils */ 44 45 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 46 { 47 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 48 49 u64_stats_update_begin(&tstats->syncp); 50 tstats->tx_packets++; 51 tstats->tx_bytes += len; 52 u64_stats_update_end(&tstats->syncp); 53 } 54 55 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 56 struct sk_buff *skb, int group_addr, 57 int next_frag_len) 58 { 59 int rate, mrate, erp, dur, i, shift = 0; 60 struct ieee80211_rate *txrate; 61 struct ieee80211_local *local = tx->local; 62 struct ieee80211_supported_band *sband; 63 struct ieee80211_hdr *hdr; 64 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 65 struct ieee80211_chanctx_conf *chanctx_conf; 66 u32 rate_flags = 0; 67 68 /* assume HW handles this */ 69 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 70 return 0; 71 72 rcu_read_lock(); 73 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 74 if (chanctx_conf) { 75 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 76 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 77 } 78 rcu_read_unlock(); 79 80 /* uh huh? */ 81 if (WARN_ON_ONCE(tx->rate.idx < 0)) 82 return 0; 83 84 sband = local->hw.wiphy->bands[info->band]; 85 txrate = &sband->bitrates[tx->rate.idx]; 86 87 erp = txrate->flags & IEEE80211_RATE_ERP_G; 88 89 /* 90 * data and mgmt (except PS Poll): 91 * - during CFP: 32768 92 * - during contention period: 93 * if addr1 is group address: 0 94 * if more fragments = 0 and addr1 is individual address: time to 95 * transmit one ACK plus SIFS 96 * if more fragments = 1 and addr1 is individual address: time to 97 * transmit next fragment plus 2 x ACK plus 3 x SIFS 98 * 99 * IEEE 802.11, 9.6: 100 * - control response frame (CTS or ACK) shall be transmitted using the 101 * same rate as the immediately previous frame in the frame exchange 102 * sequence, if this rate belongs to the PHY mandatory rates, or else 103 * at the highest possible rate belonging to the PHY rates in the 104 * BSSBasicRateSet 105 */ 106 hdr = (struct ieee80211_hdr *)skb->data; 107 if (ieee80211_is_ctl(hdr->frame_control)) { 108 /* TODO: These control frames are not currently sent by 109 * mac80211, but should they be implemented, this function 110 * needs to be updated to support duration field calculation. 111 * 112 * RTS: time needed to transmit pending data/mgmt frame plus 113 * one CTS frame plus one ACK frame plus 3 x SIFS 114 * CTS: duration of immediately previous RTS minus time 115 * required to transmit CTS and its SIFS 116 * ACK: 0 if immediately previous directed data/mgmt had 117 * more=0, with more=1 duration in ACK frame is duration 118 * from previous frame minus time needed to transmit ACK 119 * and its SIFS 120 * PS Poll: BIT(15) | BIT(14) | aid 121 */ 122 return 0; 123 } 124 125 /* data/mgmt */ 126 if (0 /* FIX: data/mgmt during CFP */) 127 return cpu_to_le16(32768); 128 129 if (group_addr) /* Group address as the destination - no ACK */ 130 return 0; 131 132 /* Individual destination address: 133 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 134 * CTS and ACK frames shall be transmitted using the highest rate in 135 * basic rate set that is less than or equal to the rate of the 136 * immediately previous frame and that is using the same modulation 137 * (CCK or OFDM). If no basic rate set matches with these requirements, 138 * the highest mandatory rate of the PHY that is less than or equal to 139 * the rate of the previous frame is used. 140 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 141 */ 142 rate = -1; 143 /* use lowest available if everything fails */ 144 mrate = sband->bitrates[0].bitrate; 145 for (i = 0; i < sband->n_bitrates; i++) { 146 struct ieee80211_rate *r = &sband->bitrates[i]; 147 148 if (r->bitrate > txrate->bitrate) 149 break; 150 151 if ((rate_flags & r->flags) != rate_flags) 152 continue; 153 154 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 155 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 156 157 switch (sband->band) { 158 case NL80211_BAND_2GHZ: { 159 u32 flag; 160 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 161 flag = IEEE80211_RATE_MANDATORY_G; 162 else 163 flag = IEEE80211_RATE_MANDATORY_B; 164 if (r->flags & flag) 165 mrate = r->bitrate; 166 break; 167 } 168 case NL80211_BAND_5GHZ: 169 if (r->flags & IEEE80211_RATE_MANDATORY_A) 170 mrate = r->bitrate; 171 break; 172 case NL80211_BAND_60GHZ: 173 /* TODO, for now fall through */ 174 case NUM_NL80211_BANDS: 175 WARN_ON(1); 176 break; 177 } 178 } 179 if (rate == -1) { 180 /* No matching basic rate found; use highest suitable mandatory 181 * PHY rate */ 182 rate = DIV_ROUND_UP(mrate, 1 << shift); 183 } 184 185 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 186 if (ieee80211_is_data_qos(hdr->frame_control) && 187 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 188 dur = 0; 189 else 190 /* Time needed to transmit ACK 191 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 192 * to closest integer */ 193 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 194 tx->sdata->vif.bss_conf.use_short_preamble, 195 shift); 196 197 if (next_frag_len) { 198 /* Frame is fragmented: duration increases with time needed to 199 * transmit next fragment plus ACK and 2 x SIFS. */ 200 dur *= 2; /* ACK + SIFS */ 201 /* next fragment */ 202 dur += ieee80211_frame_duration(sband->band, next_frag_len, 203 txrate->bitrate, erp, 204 tx->sdata->vif.bss_conf.use_short_preamble, 205 shift); 206 } 207 208 return cpu_to_le16(dur); 209 } 210 211 /* tx handlers */ 212 static ieee80211_tx_result debug_noinline 213 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 214 { 215 struct ieee80211_local *local = tx->local; 216 struct ieee80211_if_managed *ifmgd; 217 218 /* driver doesn't support power save */ 219 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 220 return TX_CONTINUE; 221 222 /* hardware does dynamic power save */ 223 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 224 return TX_CONTINUE; 225 226 /* dynamic power save disabled */ 227 if (local->hw.conf.dynamic_ps_timeout <= 0) 228 return TX_CONTINUE; 229 230 /* we are scanning, don't enable power save */ 231 if (local->scanning) 232 return TX_CONTINUE; 233 234 if (!local->ps_sdata) 235 return TX_CONTINUE; 236 237 /* No point if we're going to suspend */ 238 if (local->quiescing) 239 return TX_CONTINUE; 240 241 /* dynamic ps is supported only in managed mode */ 242 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 243 return TX_CONTINUE; 244 245 ifmgd = &tx->sdata->u.mgd; 246 247 /* 248 * Don't wakeup from power save if u-apsd is enabled, voip ac has 249 * u-apsd enabled and the frame is in voip class. This effectively 250 * means that even if all access categories have u-apsd enabled, in 251 * practise u-apsd is only used with the voip ac. This is a 252 * workaround for the case when received voip class packets do not 253 * have correct qos tag for some reason, due the network or the 254 * peer application. 255 * 256 * Note: ifmgd->uapsd_queues access is racy here. If the value is 257 * changed via debugfs, user needs to reassociate manually to have 258 * everything in sync. 259 */ 260 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 261 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 262 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 263 return TX_CONTINUE; 264 265 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 266 ieee80211_stop_queues_by_reason(&local->hw, 267 IEEE80211_MAX_QUEUE_MAP, 268 IEEE80211_QUEUE_STOP_REASON_PS, 269 false); 270 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 271 ieee80211_queue_work(&local->hw, 272 &local->dynamic_ps_disable_work); 273 } 274 275 /* Don't restart the timer if we're not disassociated */ 276 if (!ifmgd->associated) 277 return TX_CONTINUE; 278 279 mod_timer(&local->dynamic_ps_timer, jiffies + 280 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 281 282 return TX_CONTINUE; 283 } 284 285 static ieee80211_tx_result debug_noinline 286 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 287 { 288 289 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 290 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 291 bool assoc = false; 292 293 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 294 return TX_CONTINUE; 295 296 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 297 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 298 !ieee80211_is_probe_req(hdr->frame_control) && 299 !ieee80211_is_nullfunc(hdr->frame_control)) 300 /* 301 * When software scanning only nullfunc frames (to notify 302 * the sleep state to the AP) and probe requests (for the 303 * active scan) are allowed, all other frames should not be 304 * sent and we should not get here, but if we do 305 * nonetheless, drop them to avoid sending them 306 * off-channel. See the link below and 307 * ieee80211_start_scan() for more. 308 * 309 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 310 */ 311 return TX_DROP; 312 313 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 314 return TX_CONTINUE; 315 316 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 317 return TX_CONTINUE; 318 319 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 320 return TX_CONTINUE; 321 322 if (tx->sta) 323 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 324 325 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 326 if (unlikely(!assoc && 327 ieee80211_is_data(hdr->frame_control))) { 328 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 329 sdata_info(tx->sdata, 330 "dropped data frame to not associated station %pM\n", 331 hdr->addr1); 332 #endif 333 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 334 return TX_DROP; 335 } 336 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 337 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 338 /* 339 * No associated STAs - no need to send multicast 340 * frames. 341 */ 342 return TX_DROP; 343 } 344 345 return TX_CONTINUE; 346 } 347 348 /* This function is called whenever the AP is about to exceed the maximum limit 349 * of buffered frames for power saving STAs. This situation should not really 350 * happen often during normal operation, so dropping the oldest buffered packet 351 * from each queue should be OK to make some room for new frames. */ 352 static void purge_old_ps_buffers(struct ieee80211_local *local) 353 { 354 int total = 0, purged = 0; 355 struct sk_buff *skb; 356 struct ieee80211_sub_if_data *sdata; 357 struct sta_info *sta; 358 359 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 360 struct ps_data *ps; 361 362 if (sdata->vif.type == NL80211_IFTYPE_AP) 363 ps = &sdata->u.ap.ps; 364 else if (ieee80211_vif_is_mesh(&sdata->vif)) 365 ps = &sdata->u.mesh.ps; 366 else 367 continue; 368 369 skb = skb_dequeue(&ps->bc_buf); 370 if (skb) { 371 purged++; 372 ieee80211_free_txskb(&local->hw, skb); 373 } 374 total += skb_queue_len(&ps->bc_buf); 375 } 376 377 /* 378 * Drop one frame from each station from the lowest-priority 379 * AC that has frames at all. 380 */ 381 list_for_each_entry_rcu(sta, &local->sta_list, list) { 382 int ac; 383 384 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 385 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 386 total += skb_queue_len(&sta->ps_tx_buf[ac]); 387 if (skb) { 388 purged++; 389 ieee80211_free_txskb(&local->hw, skb); 390 break; 391 } 392 } 393 } 394 395 local->total_ps_buffered = total; 396 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 397 } 398 399 static ieee80211_tx_result 400 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 401 { 402 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 403 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 404 struct ps_data *ps; 405 406 /* 407 * broadcast/multicast frame 408 * 409 * If any of the associated/peer stations is in power save mode, 410 * the frame is buffered to be sent after DTIM beacon frame. 411 * This is done either by the hardware or us. 412 */ 413 414 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 415 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 416 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 417 if (!tx->sdata->bss) 418 return TX_CONTINUE; 419 420 ps = &tx->sdata->bss->ps; 421 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 422 ps = &tx->sdata->u.mesh.ps; 423 } else { 424 return TX_CONTINUE; 425 } 426 427 428 /* no buffering for ordered frames */ 429 if (ieee80211_has_order(hdr->frame_control)) 430 return TX_CONTINUE; 431 432 if (ieee80211_is_probe_req(hdr->frame_control)) 433 return TX_CONTINUE; 434 435 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 436 info->hw_queue = tx->sdata->vif.cab_queue; 437 438 /* no stations in PS mode */ 439 if (!atomic_read(&ps->num_sta_ps)) 440 return TX_CONTINUE; 441 442 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 443 444 /* device releases frame after DTIM beacon */ 445 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 446 return TX_CONTINUE; 447 448 /* buffered in mac80211 */ 449 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 450 purge_old_ps_buffers(tx->local); 451 452 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 453 ps_dbg(tx->sdata, 454 "BC TX buffer full - dropping the oldest frame\n"); 455 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 456 } else 457 tx->local->total_ps_buffered++; 458 459 skb_queue_tail(&ps->bc_buf, tx->skb); 460 461 return TX_QUEUED; 462 } 463 464 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 465 struct sk_buff *skb) 466 { 467 if (!ieee80211_is_mgmt(fc)) 468 return 0; 469 470 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 471 return 0; 472 473 if (!ieee80211_is_robust_mgmt_frame(skb)) 474 return 0; 475 476 return 1; 477 } 478 479 static ieee80211_tx_result 480 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 481 { 482 struct sta_info *sta = tx->sta; 483 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 484 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 485 struct ieee80211_local *local = tx->local; 486 487 if (unlikely(!sta)) 488 return TX_CONTINUE; 489 490 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 491 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 492 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 493 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 494 int ac = skb_get_queue_mapping(tx->skb); 495 496 if (ieee80211_is_mgmt(hdr->frame_control) && 497 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 498 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 499 return TX_CONTINUE; 500 } 501 502 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 503 sta->sta.addr, sta->sta.aid, ac); 504 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 505 purge_old_ps_buffers(tx->local); 506 507 /* sync with ieee80211_sta_ps_deliver_wakeup */ 508 spin_lock(&sta->ps_lock); 509 /* 510 * STA woke up the meantime and all the frames on ps_tx_buf have 511 * been queued to pending queue. No reordering can happen, go 512 * ahead and Tx the packet. 513 */ 514 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 515 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 516 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 517 spin_unlock(&sta->ps_lock); 518 return TX_CONTINUE; 519 } 520 521 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 522 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 523 ps_dbg(tx->sdata, 524 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 525 sta->sta.addr, ac); 526 ieee80211_free_txskb(&local->hw, old); 527 } else 528 tx->local->total_ps_buffered++; 529 530 info->control.jiffies = jiffies; 531 info->control.vif = &tx->sdata->vif; 532 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 533 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 534 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 535 spin_unlock(&sta->ps_lock); 536 537 if (!timer_pending(&local->sta_cleanup)) 538 mod_timer(&local->sta_cleanup, 539 round_jiffies(jiffies + 540 STA_INFO_CLEANUP_INTERVAL)); 541 542 /* 543 * We queued up some frames, so the TIM bit might 544 * need to be set, recalculate it. 545 */ 546 sta_info_recalc_tim(sta); 547 548 return TX_QUEUED; 549 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 550 ps_dbg(tx->sdata, 551 "STA %pM in PS mode, but polling/in SP -> send frame\n", 552 sta->sta.addr); 553 } 554 555 return TX_CONTINUE; 556 } 557 558 static ieee80211_tx_result debug_noinline 559 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 560 { 561 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 562 return TX_CONTINUE; 563 564 if (tx->flags & IEEE80211_TX_UNICAST) 565 return ieee80211_tx_h_unicast_ps_buf(tx); 566 else 567 return ieee80211_tx_h_multicast_ps_buf(tx); 568 } 569 570 static ieee80211_tx_result debug_noinline 571 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 572 { 573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 574 575 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 576 if (tx->sdata->control_port_no_encrypt) 577 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 578 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 579 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 580 } 581 582 return TX_CONTINUE; 583 } 584 585 static ieee80211_tx_result debug_noinline 586 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 587 { 588 struct ieee80211_key *key; 589 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 590 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 591 592 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 593 tx->key = NULL; 594 else if (tx->sta && 595 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 596 tx->key = key; 597 else if (ieee80211_is_group_privacy_action(tx->skb) && 598 (key = rcu_dereference(tx->sdata->default_multicast_key))) 599 tx->key = key; 600 else if (ieee80211_is_mgmt(hdr->frame_control) && 601 is_multicast_ether_addr(hdr->addr1) && 602 ieee80211_is_robust_mgmt_frame(tx->skb) && 603 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 604 tx->key = key; 605 else if (is_multicast_ether_addr(hdr->addr1) && 606 (key = rcu_dereference(tx->sdata->default_multicast_key))) 607 tx->key = key; 608 else if (!is_multicast_ether_addr(hdr->addr1) && 609 (key = rcu_dereference(tx->sdata->default_unicast_key))) 610 tx->key = key; 611 else 612 tx->key = NULL; 613 614 if (tx->key) { 615 bool skip_hw = false; 616 617 /* TODO: add threshold stuff again */ 618 619 switch (tx->key->conf.cipher) { 620 case WLAN_CIPHER_SUITE_WEP40: 621 case WLAN_CIPHER_SUITE_WEP104: 622 case WLAN_CIPHER_SUITE_TKIP: 623 if (!ieee80211_is_data_present(hdr->frame_control)) 624 tx->key = NULL; 625 break; 626 case WLAN_CIPHER_SUITE_CCMP: 627 case WLAN_CIPHER_SUITE_CCMP_256: 628 case WLAN_CIPHER_SUITE_GCMP: 629 case WLAN_CIPHER_SUITE_GCMP_256: 630 if (!ieee80211_is_data_present(hdr->frame_control) && 631 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 632 tx->skb) && 633 !ieee80211_is_group_privacy_action(tx->skb)) 634 tx->key = NULL; 635 else 636 skip_hw = (tx->key->conf.flags & 637 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 638 ieee80211_is_mgmt(hdr->frame_control); 639 break; 640 case WLAN_CIPHER_SUITE_AES_CMAC: 641 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 642 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 643 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 644 if (!ieee80211_is_mgmt(hdr->frame_control)) 645 tx->key = NULL; 646 break; 647 } 648 649 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 650 !ieee80211_is_deauth(hdr->frame_control))) 651 return TX_DROP; 652 653 if (!skip_hw && tx->key && 654 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 655 info->control.hw_key = &tx->key->conf; 656 } 657 658 return TX_CONTINUE; 659 } 660 661 static ieee80211_tx_result debug_noinline 662 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 663 { 664 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 665 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 666 struct ieee80211_supported_band *sband; 667 u32 len; 668 struct ieee80211_tx_rate_control txrc; 669 struct ieee80211_sta_rates *ratetbl = NULL; 670 bool assoc = false; 671 672 memset(&txrc, 0, sizeof(txrc)); 673 674 sband = tx->local->hw.wiphy->bands[info->band]; 675 676 len = min_t(u32, tx->skb->len + FCS_LEN, 677 tx->local->hw.wiphy->frag_threshold); 678 679 /* set up the tx rate control struct we give the RC algo */ 680 txrc.hw = &tx->local->hw; 681 txrc.sband = sband; 682 txrc.bss_conf = &tx->sdata->vif.bss_conf; 683 txrc.skb = tx->skb; 684 txrc.reported_rate.idx = -1; 685 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 686 687 if (tx->sdata->rc_has_mcs_mask[info->band]) 688 txrc.rate_idx_mcs_mask = 689 tx->sdata->rc_rateidx_mcs_mask[info->band]; 690 691 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 692 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 693 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 694 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 695 696 /* set up RTS protection if desired */ 697 if (len > tx->local->hw.wiphy->rts_threshold) { 698 txrc.rts = true; 699 } 700 701 info->control.use_rts = txrc.rts; 702 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 703 704 /* 705 * Use short preamble if the BSS can handle it, but not for 706 * management frames unless we know the receiver can handle 707 * that -- the management frame might be to a station that 708 * just wants a probe response. 709 */ 710 if (tx->sdata->vif.bss_conf.use_short_preamble && 711 (ieee80211_is_data(hdr->frame_control) || 712 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 713 txrc.short_preamble = true; 714 715 info->control.short_preamble = txrc.short_preamble; 716 717 /* don't ask rate control when rate already injected via radiotap */ 718 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 719 return TX_CONTINUE; 720 721 if (tx->sta) 722 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 723 724 /* 725 * Lets not bother rate control if we're associated and cannot 726 * talk to the sta. This should not happen. 727 */ 728 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 729 !rate_usable_index_exists(sband, &tx->sta->sta), 730 "%s: Dropped data frame as no usable bitrate found while " 731 "scanning and associated. Target station: " 732 "%pM on %d GHz band\n", 733 tx->sdata->name, hdr->addr1, 734 info->band ? 5 : 2)) 735 return TX_DROP; 736 737 /* 738 * If we're associated with the sta at this point we know we can at 739 * least send the frame at the lowest bit rate. 740 */ 741 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 742 743 if (tx->sta && !info->control.skip_table) 744 ratetbl = rcu_dereference(tx->sta->sta.rates); 745 746 if (unlikely(info->control.rates[0].idx < 0)) { 747 if (ratetbl) { 748 struct ieee80211_tx_rate rate = { 749 .idx = ratetbl->rate[0].idx, 750 .flags = ratetbl->rate[0].flags, 751 .count = ratetbl->rate[0].count 752 }; 753 754 if (ratetbl->rate[0].idx < 0) 755 return TX_DROP; 756 757 tx->rate = rate; 758 } else { 759 return TX_DROP; 760 } 761 } else { 762 tx->rate = info->control.rates[0]; 763 } 764 765 if (txrc.reported_rate.idx < 0) { 766 txrc.reported_rate = tx->rate; 767 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 768 tx->sta->tx_stats.last_rate = txrc.reported_rate; 769 } else if (tx->sta) 770 tx->sta->tx_stats.last_rate = txrc.reported_rate; 771 772 if (ratetbl) 773 return TX_CONTINUE; 774 775 if (unlikely(!info->control.rates[0].count)) 776 info->control.rates[0].count = 1; 777 778 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 779 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 780 info->control.rates[0].count = 1; 781 782 return TX_CONTINUE; 783 } 784 785 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 786 { 787 u16 *seq = &sta->tid_seq[tid]; 788 __le16 ret = cpu_to_le16(*seq); 789 790 /* Increase the sequence number. */ 791 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 792 793 return ret; 794 } 795 796 static ieee80211_tx_result debug_noinline 797 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 798 { 799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 800 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 801 int tid; 802 803 /* 804 * Packet injection may want to control the sequence 805 * number, if we have no matching interface then we 806 * neither assign one ourselves nor ask the driver to. 807 */ 808 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 809 return TX_CONTINUE; 810 811 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 812 return TX_CONTINUE; 813 814 if (ieee80211_hdrlen(hdr->frame_control) < 24) 815 return TX_CONTINUE; 816 817 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 818 return TX_CONTINUE; 819 820 /* 821 * Anything but QoS data that has a sequence number field 822 * (is long enough) gets a sequence number from the global 823 * counter. QoS data frames with a multicast destination 824 * also use the global counter (802.11-2012 9.3.2.10). 825 */ 826 if (!ieee80211_is_data_qos(hdr->frame_control) || 827 is_multicast_ether_addr(hdr->addr1)) { 828 if (tx->flags & IEEE80211_TX_NO_SEQNO) 829 return TX_CONTINUE; 830 /* driver should assign sequence number */ 831 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 832 /* for pure STA mode without beacons, we can do it */ 833 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 834 tx->sdata->sequence_number += 0x10; 835 if (tx->sta) 836 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 837 return TX_CONTINUE; 838 } 839 840 /* 841 * This should be true for injected/management frames only, for 842 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 843 * above since they are not QoS-data frames. 844 */ 845 if (!tx->sta) 846 return TX_CONTINUE; 847 848 /* include per-STA, per-TID sequence counter */ 849 tid = ieee80211_get_tid(hdr); 850 tx->sta->tx_stats.msdu[tid]++; 851 852 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 853 854 return TX_CONTINUE; 855 } 856 857 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 858 struct sk_buff *skb, int hdrlen, 859 int frag_threshold) 860 { 861 struct ieee80211_local *local = tx->local; 862 struct ieee80211_tx_info *info; 863 struct sk_buff *tmp; 864 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 865 int pos = hdrlen + per_fragm; 866 int rem = skb->len - hdrlen - per_fragm; 867 868 if (WARN_ON(rem < 0)) 869 return -EINVAL; 870 871 /* first fragment was already added to queue by caller */ 872 873 while (rem) { 874 int fraglen = per_fragm; 875 876 if (fraglen > rem) 877 fraglen = rem; 878 rem -= fraglen; 879 tmp = dev_alloc_skb(local->tx_headroom + 880 frag_threshold + 881 tx->sdata->encrypt_headroom + 882 IEEE80211_ENCRYPT_TAILROOM); 883 if (!tmp) 884 return -ENOMEM; 885 886 __skb_queue_tail(&tx->skbs, tmp); 887 888 skb_reserve(tmp, 889 local->tx_headroom + tx->sdata->encrypt_headroom); 890 891 /* copy control information */ 892 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 893 894 info = IEEE80211_SKB_CB(tmp); 895 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 896 IEEE80211_TX_CTL_FIRST_FRAGMENT); 897 898 if (rem) 899 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 900 901 skb_copy_queue_mapping(tmp, skb); 902 tmp->priority = skb->priority; 903 tmp->dev = skb->dev; 904 905 /* copy header and data */ 906 skb_put_data(tmp, skb->data, hdrlen); 907 skb_put_data(tmp, skb->data + pos, fraglen); 908 909 pos += fraglen; 910 } 911 912 /* adjust first fragment's length */ 913 skb_trim(skb, hdrlen + per_fragm); 914 return 0; 915 } 916 917 static ieee80211_tx_result debug_noinline 918 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 919 { 920 struct sk_buff *skb = tx->skb; 921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 922 struct ieee80211_hdr *hdr = (void *)skb->data; 923 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 924 int hdrlen; 925 int fragnum; 926 927 /* no matter what happens, tx->skb moves to tx->skbs */ 928 __skb_queue_tail(&tx->skbs, skb); 929 tx->skb = NULL; 930 931 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 932 return TX_CONTINUE; 933 934 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 935 return TX_CONTINUE; 936 937 /* 938 * Warn when submitting a fragmented A-MPDU frame and drop it. 939 * This scenario is handled in ieee80211_tx_prepare but extra 940 * caution taken here as fragmented ampdu may cause Tx stop. 941 */ 942 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 943 return TX_DROP; 944 945 hdrlen = ieee80211_hdrlen(hdr->frame_control); 946 947 /* internal error, why isn't DONTFRAG set? */ 948 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 949 return TX_DROP; 950 951 /* 952 * Now fragment the frame. This will allocate all the fragments and 953 * chain them (using skb as the first fragment) to skb->next. 954 * During transmission, we will remove the successfully transmitted 955 * fragments from this list. When the low-level driver rejects one 956 * of the fragments then we will simply pretend to accept the skb 957 * but store it away as pending. 958 */ 959 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 960 return TX_DROP; 961 962 /* update duration/seq/flags of fragments */ 963 fragnum = 0; 964 965 skb_queue_walk(&tx->skbs, skb) { 966 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 967 968 hdr = (void *)skb->data; 969 info = IEEE80211_SKB_CB(skb); 970 971 if (!skb_queue_is_last(&tx->skbs, skb)) { 972 hdr->frame_control |= morefrags; 973 /* 974 * No multi-rate retries for fragmented frames, that 975 * would completely throw off the NAV at other STAs. 976 */ 977 info->control.rates[1].idx = -1; 978 info->control.rates[2].idx = -1; 979 info->control.rates[3].idx = -1; 980 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 981 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 982 } else { 983 hdr->frame_control &= ~morefrags; 984 } 985 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 986 fragnum++; 987 } 988 989 return TX_CONTINUE; 990 } 991 992 static ieee80211_tx_result debug_noinline 993 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 994 { 995 struct sk_buff *skb; 996 int ac = -1; 997 998 if (!tx->sta) 999 return TX_CONTINUE; 1000 1001 skb_queue_walk(&tx->skbs, skb) { 1002 ac = skb_get_queue_mapping(skb); 1003 tx->sta->tx_stats.bytes[ac] += skb->len; 1004 } 1005 if (ac >= 0) 1006 tx->sta->tx_stats.packets[ac]++; 1007 1008 return TX_CONTINUE; 1009 } 1010 1011 static ieee80211_tx_result debug_noinline 1012 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1013 { 1014 if (!tx->key) 1015 return TX_CONTINUE; 1016 1017 switch (tx->key->conf.cipher) { 1018 case WLAN_CIPHER_SUITE_WEP40: 1019 case WLAN_CIPHER_SUITE_WEP104: 1020 return ieee80211_crypto_wep_encrypt(tx); 1021 case WLAN_CIPHER_SUITE_TKIP: 1022 return ieee80211_crypto_tkip_encrypt(tx); 1023 case WLAN_CIPHER_SUITE_CCMP: 1024 return ieee80211_crypto_ccmp_encrypt( 1025 tx, IEEE80211_CCMP_MIC_LEN); 1026 case WLAN_CIPHER_SUITE_CCMP_256: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_256_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_AES_CMAC: 1030 return ieee80211_crypto_aes_cmac_encrypt(tx); 1031 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1032 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1033 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1035 return ieee80211_crypto_aes_gmac_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_GCMP: 1037 case WLAN_CIPHER_SUITE_GCMP_256: 1038 return ieee80211_crypto_gcmp_encrypt(tx); 1039 default: 1040 return ieee80211_crypto_hw_encrypt(tx); 1041 } 1042 1043 return TX_DROP; 1044 } 1045 1046 static ieee80211_tx_result debug_noinline 1047 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1048 { 1049 struct sk_buff *skb; 1050 struct ieee80211_hdr *hdr; 1051 int next_len; 1052 bool group_addr; 1053 1054 skb_queue_walk(&tx->skbs, skb) { 1055 hdr = (void *) skb->data; 1056 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1057 break; /* must not overwrite AID */ 1058 if (!skb_queue_is_last(&tx->skbs, skb)) { 1059 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1060 next_len = next->len; 1061 } else 1062 next_len = 0; 1063 group_addr = is_multicast_ether_addr(hdr->addr1); 1064 1065 hdr->duration_id = 1066 ieee80211_duration(tx, skb, group_addr, next_len); 1067 } 1068 1069 return TX_CONTINUE; 1070 } 1071 1072 /* actual transmit path */ 1073 1074 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1075 struct sk_buff *skb, 1076 struct ieee80211_tx_info *info, 1077 struct tid_ampdu_tx *tid_tx, 1078 int tid) 1079 { 1080 bool queued = false; 1081 bool reset_agg_timer = false; 1082 struct sk_buff *purge_skb = NULL; 1083 1084 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1085 info->flags |= IEEE80211_TX_CTL_AMPDU; 1086 reset_agg_timer = true; 1087 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1088 /* 1089 * nothing -- this aggregation session is being started 1090 * but that might still fail with the driver 1091 */ 1092 } else if (!tx->sta->sta.txq[tid]) { 1093 spin_lock(&tx->sta->lock); 1094 /* 1095 * Need to re-check now, because we may get here 1096 * 1097 * 1) in the window during which the setup is actually 1098 * already done, but not marked yet because not all 1099 * packets are spliced over to the driver pending 1100 * queue yet -- if this happened we acquire the lock 1101 * either before or after the splice happens, but 1102 * need to recheck which of these cases happened. 1103 * 1104 * 2) during session teardown, if the OPERATIONAL bit 1105 * was cleared due to the teardown but the pointer 1106 * hasn't been assigned NULL yet (or we loaded it 1107 * before it was assigned) -- in this case it may 1108 * now be NULL which means we should just let the 1109 * packet pass through because splicing the frames 1110 * back is already done. 1111 */ 1112 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1113 1114 if (!tid_tx) { 1115 /* do nothing, let packet pass through */ 1116 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1117 info->flags |= IEEE80211_TX_CTL_AMPDU; 1118 reset_agg_timer = true; 1119 } else { 1120 queued = true; 1121 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1122 clear_sta_flag(tx->sta, WLAN_STA_SP); 1123 ps_dbg(tx->sta->sdata, 1124 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1125 tx->sta->sta.addr, tx->sta->sta.aid); 1126 } 1127 info->control.vif = &tx->sdata->vif; 1128 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1129 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1130 __skb_queue_tail(&tid_tx->pending, skb); 1131 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1132 purge_skb = __skb_dequeue(&tid_tx->pending); 1133 } 1134 spin_unlock(&tx->sta->lock); 1135 1136 if (purge_skb) 1137 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1138 } 1139 1140 /* reset session timer */ 1141 if (reset_agg_timer) 1142 tid_tx->last_tx = jiffies; 1143 1144 return queued; 1145 } 1146 1147 /* 1148 * initialises @tx 1149 * pass %NULL for the station if unknown, a valid pointer if known 1150 * or an ERR_PTR() if the station is known not to exist 1151 */ 1152 static ieee80211_tx_result 1153 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1154 struct ieee80211_tx_data *tx, 1155 struct sta_info *sta, struct sk_buff *skb) 1156 { 1157 struct ieee80211_local *local = sdata->local; 1158 struct ieee80211_hdr *hdr; 1159 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1160 int tid; 1161 1162 memset(tx, 0, sizeof(*tx)); 1163 tx->skb = skb; 1164 tx->local = local; 1165 tx->sdata = sdata; 1166 __skb_queue_head_init(&tx->skbs); 1167 1168 /* 1169 * If this flag is set to true anywhere, and we get here, 1170 * we are doing the needed processing, so remove the flag 1171 * now. 1172 */ 1173 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1174 1175 hdr = (struct ieee80211_hdr *) skb->data; 1176 1177 if (likely(sta)) { 1178 if (!IS_ERR(sta)) 1179 tx->sta = sta; 1180 } else { 1181 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1182 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1183 if (!tx->sta && sdata->wdev.use_4addr) 1184 return TX_DROP; 1185 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1186 IEEE80211_TX_CTL_INJECTED) || 1187 tx->sdata->control_port_protocol == tx->skb->protocol) { 1188 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1189 } 1190 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1191 tx->sta = sta_info_get(sdata, hdr->addr1); 1192 } 1193 1194 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1195 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1196 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1197 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1198 struct tid_ampdu_tx *tid_tx; 1199 1200 tid = ieee80211_get_tid(hdr); 1201 1202 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1203 if (tid_tx) { 1204 bool queued; 1205 1206 queued = ieee80211_tx_prep_agg(tx, skb, info, 1207 tid_tx, tid); 1208 1209 if (unlikely(queued)) 1210 return TX_QUEUED; 1211 } 1212 } 1213 1214 if (is_multicast_ether_addr(hdr->addr1)) { 1215 tx->flags &= ~IEEE80211_TX_UNICAST; 1216 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1217 } else 1218 tx->flags |= IEEE80211_TX_UNICAST; 1219 1220 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1221 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1222 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1223 info->flags & IEEE80211_TX_CTL_AMPDU) 1224 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1225 } 1226 1227 if (!tx->sta) 1228 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1229 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1230 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1231 ieee80211_check_fast_xmit(tx->sta); 1232 } 1233 1234 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1235 1236 return TX_CONTINUE; 1237 } 1238 1239 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1240 struct ieee80211_vif *vif, 1241 struct sta_info *sta, 1242 struct sk_buff *skb) 1243 { 1244 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1245 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1246 struct ieee80211_txq *txq = NULL; 1247 1248 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1249 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1250 return NULL; 1251 1252 if (!ieee80211_is_data_present(hdr->frame_control)) 1253 return NULL; 1254 1255 if (sta) { 1256 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1257 1258 if (!sta->uploaded) 1259 return NULL; 1260 1261 txq = sta->sta.txq[tid]; 1262 } else if (vif) { 1263 txq = vif->txq; 1264 } 1265 1266 if (!txq) 1267 return NULL; 1268 1269 return to_txq_info(txq); 1270 } 1271 1272 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1273 { 1274 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1275 } 1276 1277 static u32 codel_skb_len_func(const struct sk_buff *skb) 1278 { 1279 return skb->len; 1280 } 1281 1282 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1283 { 1284 const struct ieee80211_tx_info *info; 1285 1286 info = (const struct ieee80211_tx_info *)skb->cb; 1287 return info->control.enqueue_time; 1288 } 1289 1290 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1291 void *ctx) 1292 { 1293 struct ieee80211_local *local; 1294 struct txq_info *txqi; 1295 struct fq *fq; 1296 struct fq_flow *flow; 1297 1298 txqi = ctx; 1299 local = vif_to_sdata(txqi->txq.vif)->local; 1300 fq = &local->fq; 1301 1302 if (cvars == &txqi->def_cvars) 1303 flow = &txqi->def_flow; 1304 else 1305 flow = &fq->flows[cvars - local->cvars]; 1306 1307 return fq_flow_dequeue(fq, flow); 1308 } 1309 1310 static void codel_drop_func(struct sk_buff *skb, 1311 void *ctx) 1312 { 1313 struct ieee80211_local *local; 1314 struct ieee80211_hw *hw; 1315 struct txq_info *txqi; 1316 1317 txqi = ctx; 1318 local = vif_to_sdata(txqi->txq.vif)->local; 1319 hw = &local->hw; 1320 1321 ieee80211_free_txskb(hw, skb); 1322 } 1323 1324 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1325 struct fq_tin *tin, 1326 struct fq_flow *flow) 1327 { 1328 struct ieee80211_local *local; 1329 struct txq_info *txqi; 1330 struct codel_vars *cvars; 1331 struct codel_params *cparams; 1332 struct codel_stats *cstats; 1333 1334 local = container_of(fq, struct ieee80211_local, fq); 1335 txqi = container_of(tin, struct txq_info, tin); 1336 cstats = &txqi->cstats; 1337 1338 if (txqi->txq.sta) { 1339 struct sta_info *sta = container_of(txqi->txq.sta, 1340 struct sta_info, sta); 1341 cparams = &sta->cparams; 1342 } else { 1343 cparams = &local->cparams; 1344 } 1345 1346 if (flow == &txqi->def_flow) 1347 cvars = &txqi->def_cvars; 1348 else 1349 cvars = &local->cvars[flow - fq->flows]; 1350 1351 return codel_dequeue(txqi, 1352 &flow->backlog, 1353 cparams, 1354 cvars, 1355 cstats, 1356 codel_skb_len_func, 1357 codel_skb_time_func, 1358 codel_drop_func, 1359 codel_dequeue_func); 1360 } 1361 1362 static void fq_skb_free_func(struct fq *fq, 1363 struct fq_tin *tin, 1364 struct fq_flow *flow, 1365 struct sk_buff *skb) 1366 { 1367 struct ieee80211_local *local; 1368 1369 local = container_of(fq, struct ieee80211_local, fq); 1370 ieee80211_free_txskb(&local->hw, skb); 1371 } 1372 1373 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1374 struct fq_tin *tin, 1375 int idx, 1376 struct sk_buff *skb) 1377 { 1378 struct txq_info *txqi; 1379 1380 txqi = container_of(tin, struct txq_info, tin); 1381 return &txqi->def_flow; 1382 } 1383 1384 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1385 struct txq_info *txqi, 1386 struct sk_buff *skb) 1387 { 1388 struct fq *fq = &local->fq; 1389 struct fq_tin *tin = &txqi->tin; 1390 1391 ieee80211_set_skb_enqueue_time(skb); 1392 fq_tin_enqueue(fq, tin, skb, 1393 fq_skb_free_func, 1394 fq_flow_get_default_func); 1395 } 1396 1397 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1398 struct fq_flow *flow, struct sk_buff *skb, 1399 void *data) 1400 { 1401 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1402 1403 return info->control.vif == data; 1404 } 1405 1406 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1407 struct ieee80211_sub_if_data *sdata) 1408 { 1409 struct fq *fq = &local->fq; 1410 struct txq_info *txqi; 1411 struct fq_tin *tin; 1412 struct ieee80211_sub_if_data *ap; 1413 1414 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1415 return; 1416 1417 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1418 1419 if (!ap->vif.txq) 1420 return; 1421 1422 txqi = to_txq_info(ap->vif.txq); 1423 tin = &txqi->tin; 1424 1425 spin_lock_bh(&fq->lock); 1426 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1427 fq_skb_free_func); 1428 spin_unlock_bh(&fq->lock); 1429 } 1430 1431 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1432 struct sta_info *sta, 1433 struct txq_info *txqi, int tid) 1434 { 1435 fq_tin_init(&txqi->tin); 1436 fq_flow_init(&txqi->def_flow); 1437 codel_vars_init(&txqi->def_cvars); 1438 codel_stats_init(&txqi->cstats); 1439 __skb_queue_head_init(&txqi->frags); 1440 1441 txqi->txq.vif = &sdata->vif; 1442 1443 if (sta) { 1444 txqi->txq.sta = &sta->sta; 1445 sta->sta.txq[tid] = &txqi->txq; 1446 txqi->txq.tid = tid; 1447 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1448 } else { 1449 sdata->vif.txq = &txqi->txq; 1450 txqi->txq.tid = 0; 1451 txqi->txq.ac = IEEE80211_AC_BE; 1452 } 1453 } 1454 1455 void ieee80211_txq_purge(struct ieee80211_local *local, 1456 struct txq_info *txqi) 1457 { 1458 struct fq *fq = &local->fq; 1459 struct fq_tin *tin = &txqi->tin; 1460 1461 fq_tin_reset(fq, tin, fq_skb_free_func); 1462 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1463 } 1464 1465 void ieee80211_txq_set_params(struct ieee80211_local *local) 1466 { 1467 if (local->hw.wiphy->txq_limit) 1468 local->fq.limit = local->hw.wiphy->txq_limit; 1469 else 1470 local->hw.wiphy->txq_limit = local->fq.limit; 1471 1472 if (local->hw.wiphy->txq_memory_limit) 1473 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1474 else 1475 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1476 1477 if (local->hw.wiphy->txq_quantum) 1478 local->fq.quantum = local->hw.wiphy->txq_quantum; 1479 else 1480 local->hw.wiphy->txq_quantum = local->fq.quantum; 1481 } 1482 1483 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1484 { 1485 struct fq *fq = &local->fq; 1486 int ret; 1487 int i; 1488 bool supp_vht = false; 1489 enum nl80211_band band; 1490 1491 if (!local->ops->wake_tx_queue) 1492 return 0; 1493 1494 ret = fq_init(fq, 4096); 1495 if (ret) 1496 return ret; 1497 1498 /* 1499 * If the hardware doesn't support VHT, it is safe to limit the maximum 1500 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1501 */ 1502 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1503 struct ieee80211_supported_band *sband; 1504 1505 sband = local->hw.wiphy->bands[band]; 1506 if (!sband) 1507 continue; 1508 1509 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1510 } 1511 1512 if (!supp_vht) 1513 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1514 1515 codel_params_init(&local->cparams); 1516 local->cparams.interval = MS2TIME(100); 1517 local->cparams.target = MS2TIME(20); 1518 local->cparams.ecn = true; 1519 1520 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1521 GFP_KERNEL); 1522 if (!local->cvars) { 1523 spin_lock_bh(&fq->lock); 1524 fq_reset(fq, fq_skb_free_func); 1525 spin_unlock_bh(&fq->lock); 1526 return -ENOMEM; 1527 } 1528 1529 for (i = 0; i < fq->flows_cnt; i++) 1530 codel_vars_init(&local->cvars[i]); 1531 1532 ieee80211_txq_set_params(local); 1533 1534 return 0; 1535 } 1536 1537 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1538 { 1539 struct fq *fq = &local->fq; 1540 1541 if (!local->ops->wake_tx_queue) 1542 return; 1543 1544 kfree(local->cvars); 1545 local->cvars = NULL; 1546 1547 spin_lock_bh(&fq->lock); 1548 fq_reset(fq, fq_skb_free_func); 1549 spin_unlock_bh(&fq->lock); 1550 } 1551 1552 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1553 struct ieee80211_sub_if_data *sdata, 1554 struct sta_info *sta, 1555 struct sk_buff *skb) 1556 { 1557 struct fq *fq = &local->fq; 1558 struct ieee80211_vif *vif; 1559 struct txq_info *txqi; 1560 1561 if (!local->ops->wake_tx_queue || 1562 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1563 return false; 1564 1565 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1566 sdata = container_of(sdata->bss, 1567 struct ieee80211_sub_if_data, u.ap); 1568 1569 vif = &sdata->vif; 1570 txqi = ieee80211_get_txq(local, vif, sta, skb); 1571 1572 if (!txqi) 1573 return false; 1574 1575 spin_lock_bh(&fq->lock); 1576 ieee80211_txq_enqueue(local, txqi, skb); 1577 spin_unlock_bh(&fq->lock); 1578 1579 drv_wake_tx_queue(local, txqi); 1580 1581 return true; 1582 } 1583 1584 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1585 struct ieee80211_vif *vif, 1586 struct ieee80211_sta *sta, 1587 struct sk_buff_head *skbs, 1588 bool txpending) 1589 { 1590 struct ieee80211_tx_control control = {}; 1591 struct sk_buff *skb, *tmp; 1592 unsigned long flags; 1593 1594 skb_queue_walk_safe(skbs, skb, tmp) { 1595 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1596 int q = info->hw_queue; 1597 1598 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1599 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1600 __skb_unlink(skb, skbs); 1601 ieee80211_free_txskb(&local->hw, skb); 1602 continue; 1603 } 1604 #endif 1605 1606 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1607 if (local->queue_stop_reasons[q] || 1608 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1609 if (unlikely(info->flags & 1610 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1611 if (local->queue_stop_reasons[q] & 1612 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1613 /* 1614 * Drop off-channel frames if queues 1615 * are stopped for any reason other 1616 * than off-channel operation. Never 1617 * queue them. 1618 */ 1619 spin_unlock_irqrestore( 1620 &local->queue_stop_reason_lock, 1621 flags); 1622 ieee80211_purge_tx_queue(&local->hw, 1623 skbs); 1624 return true; 1625 } 1626 } else { 1627 1628 /* 1629 * Since queue is stopped, queue up frames for 1630 * later transmission from the tx-pending 1631 * tasklet when the queue is woken again. 1632 */ 1633 if (txpending) 1634 skb_queue_splice_init(skbs, 1635 &local->pending[q]); 1636 else 1637 skb_queue_splice_tail_init(skbs, 1638 &local->pending[q]); 1639 1640 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1641 flags); 1642 return false; 1643 } 1644 } 1645 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1646 1647 info->control.vif = vif; 1648 control.sta = sta; 1649 1650 __skb_unlink(skb, skbs); 1651 drv_tx(local, &control, skb); 1652 } 1653 1654 return true; 1655 } 1656 1657 /* 1658 * Returns false if the frame couldn't be transmitted but was queued instead. 1659 */ 1660 static bool __ieee80211_tx(struct ieee80211_local *local, 1661 struct sk_buff_head *skbs, int led_len, 1662 struct sta_info *sta, bool txpending) 1663 { 1664 struct ieee80211_tx_info *info; 1665 struct ieee80211_sub_if_data *sdata; 1666 struct ieee80211_vif *vif; 1667 struct ieee80211_sta *pubsta; 1668 struct sk_buff *skb; 1669 bool result = true; 1670 __le16 fc; 1671 1672 if (WARN_ON(skb_queue_empty(skbs))) 1673 return true; 1674 1675 skb = skb_peek(skbs); 1676 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1677 info = IEEE80211_SKB_CB(skb); 1678 sdata = vif_to_sdata(info->control.vif); 1679 if (sta && !sta->uploaded) 1680 sta = NULL; 1681 1682 if (sta) 1683 pubsta = &sta->sta; 1684 else 1685 pubsta = NULL; 1686 1687 switch (sdata->vif.type) { 1688 case NL80211_IFTYPE_MONITOR: 1689 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1690 vif = &sdata->vif; 1691 break; 1692 } 1693 sdata = rcu_dereference(local->monitor_sdata); 1694 if (sdata) { 1695 vif = &sdata->vif; 1696 info->hw_queue = 1697 vif->hw_queue[skb_get_queue_mapping(skb)]; 1698 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1699 ieee80211_purge_tx_queue(&local->hw, skbs); 1700 return true; 1701 } else 1702 vif = NULL; 1703 break; 1704 case NL80211_IFTYPE_AP_VLAN: 1705 sdata = container_of(sdata->bss, 1706 struct ieee80211_sub_if_data, u.ap); 1707 /* fall through */ 1708 default: 1709 vif = &sdata->vif; 1710 break; 1711 } 1712 1713 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1714 txpending); 1715 1716 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1717 1718 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1719 1720 return result; 1721 } 1722 1723 /* 1724 * Invoke TX handlers, return 0 on success and non-zero if the 1725 * frame was dropped or queued. 1726 * 1727 * The handlers are split into an early and late part. The latter is everything 1728 * that can be sensitive to reordering, and will be deferred to after packets 1729 * are dequeued from the intermediate queues (when they are enabled). 1730 */ 1731 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1732 { 1733 ieee80211_tx_result res = TX_DROP; 1734 1735 #define CALL_TXH(txh) \ 1736 do { \ 1737 res = txh(tx); \ 1738 if (res != TX_CONTINUE) \ 1739 goto txh_done; \ 1740 } while (0) 1741 1742 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1743 CALL_TXH(ieee80211_tx_h_check_assoc); 1744 CALL_TXH(ieee80211_tx_h_ps_buf); 1745 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1746 CALL_TXH(ieee80211_tx_h_select_key); 1747 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1748 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1749 1750 txh_done: 1751 if (unlikely(res == TX_DROP)) { 1752 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1753 if (tx->skb) 1754 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1755 else 1756 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1757 return -1; 1758 } else if (unlikely(res == TX_QUEUED)) { 1759 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1760 return -1; 1761 } 1762 1763 return 0; 1764 } 1765 1766 /* 1767 * Late handlers can be called while the sta lock is held. Handlers that can 1768 * cause packets to be generated will cause deadlock! 1769 */ 1770 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1771 { 1772 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1773 ieee80211_tx_result res = TX_CONTINUE; 1774 1775 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1776 __skb_queue_tail(&tx->skbs, tx->skb); 1777 tx->skb = NULL; 1778 goto txh_done; 1779 } 1780 1781 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1782 CALL_TXH(ieee80211_tx_h_sequence); 1783 CALL_TXH(ieee80211_tx_h_fragment); 1784 /* handlers after fragment must be aware of tx info fragmentation! */ 1785 CALL_TXH(ieee80211_tx_h_stats); 1786 CALL_TXH(ieee80211_tx_h_encrypt); 1787 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1788 CALL_TXH(ieee80211_tx_h_calculate_duration); 1789 #undef CALL_TXH 1790 1791 txh_done: 1792 if (unlikely(res == TX_DROP)) { 1793 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1794 if (tx->skb) 1795 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1796 else 1797 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1798 return -1; 1799 } else if (unlikely(res == TX_QUEUED)) { 1800 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1801 return -1; 1802 } 1803 1804 return 0; 1805 } 1806 1807 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1808 { 1809 int r = invoke_tx_handlers_early(tx); 1810 1811 if (r) 1812 return r; 1813 return invoke_tx_handlers_late(tx); 1814 } 1815 1816 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1817 struct ieee80211_vif *vif, struct sk_buff *skb, 1818 int band, struct ieee80211_sta **sta) 1819 { 1820 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1822 struct ieee80211_tx_data tx; 1823 struct sk_buff *skb2; 1824 1825 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1826 return false; 1827 1828 info->band = band; 1829 info->control.vif = vif; 1830 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1831 1832 if (invoke_tx_handlers(&tx)) 1833 return false; 1834 1835 if (sta) { 1836 if (tx.sta) 1837 *sta = &tx.sta->sta; 1838 else 1839 *sta = NULL; 1840 } 1841 1842 /* this function isn't suitable for fragmented data frames */ 1843 skb2 = __skb_dequeue(&tx.skbs); 1844 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1845 ieee80211_free_txskb(hw, skb2); 1846 ieee80211_purge_tx_queue(hw, &tx.skbs); 1847 return false; 1848 } 1849 1850 return true; 1851 } 1852 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1853 1854 /* 1855 * Returns false if the frame couldn't be transmitted but was queued instead. 1856 */ 1857 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1858 struct sta_info *sta, struct sk_buff *skb, 1859 bool txpending, u32 txdata_flags) 1860 { 1861 struct ieee80211_local *local = sdata->local; 1862 struct ieee80211_tx_data tx; 1863 ieee80211_tx_result res_prepare; 1864 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1865 bool result = true; 1866 int led_len; 1867 1868 if (unlikely(skb->len < 10)) { 1869 dev_kfree_skb(skb); 1870 return true; 1871 } 1872 1873 /* initialises tx */ 1874 led_len = skb->len; 1875 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1876 1877 tx.flags |= txdata_flags; 1878 1879 if (unlikely(res_prepare == TX_DROP)) { 1880 ieee80211_free_txskb(&local->hw, skb); 1881 return true; 1882 } else if (unlikely(res_prepare == TX_QUEUED)) { 1883 return true; 1884 } 1885 1886 /* set up hw_queue value early */ 1887 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1888 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1889 info->hw_queue = 1890 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1891 1892 if (invoke_tx_handlers_early(&tx)) 1893 return false; 1894 1895 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1896 return true; 1897 1898 if (!invoke_tx_handlers_late(&tx)) 1899 result = __ieee80211_tx(local, &tx.skbs, led_len, 1900 tx.sta, txpending); 1901 1902 return result; 1903 } 1904 1905 /* device xmit handlers */ 1906 1907 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1908 struct sk_buff *skb, 1909 int head_need, bool may_encrypt) 1910 { 1911 struct ieee80211_local *local = sdata->local; 1912 int tail_need = 0; 1913 1914 if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { 1915 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1916 tail_need -= skb_tailroom(skb); 1917 tail_need = max_t(int, tail_need, 0); 1918 } 1919 1920 if (skb_cloned(skb) && 1921 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1922 !skb_clone_writable(skb, ETH_HLEN) || 1923 (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt))) 1924 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1925 else if (head_need || tail_need) 1926 I802_DEBUG_INC(local->tx_expand_skb_head); 1927 else 1928 return 0; 1929 1930 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1931 wiphy_debug(local->hw.wiphy, 1932 "failed to reallocate TX buffer\n"); 1933 return -ENOMEM; 1934 } 1935 1936 return 0; 1937 } 1938 1939 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1940 struct sta_info *sta, struct sk_buff *skb, 1941 u32 txdata_flags) 1942 { 1943 struct ieee80211_local *local = sdata->local; 1944 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1945 struct ieee80211_hdr *hdr; 1946 int headroom; 1947 bool may_encrypt; 1948 1949 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1950 1951 headroom = local->tx_headroom; 1952 if (may_encrypt) 1953 headroom += sdata->encrypt_headroom; 1954 headroom -= skb_headroom(skb); 1955 headroom = max_t(int, 0, headroom); 1956 1957 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1958 ieee80211_free_txskb(&local->hw, skb); 1959 return; 1960 } 1961 1962 hdr = (struct ieee80211_hdr *) skb->data; 1963 info->control.vif = &sdata->vif; 1964 1965 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1966 if (ieee80211_is_data(hdr->frame_control) && 1967 is_unicast_ether_addr(hdr->addr1)) { 1968 if (mesh_nexthop_resolve(sdata, skb)) 1969 return; /* skb queued: don't free */ 1970 } else { 1971 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 1972 } 1973 } 1974 1975 ieee80211_set_qos_hdr(sdata, skb); 1976 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 1977 } 1978 1979 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 1980 struct sk_buff *skb) 1981 { 1982 struct ieee80211_radiotap_iterator iterator; 1983 struct ieee80211_radiotap_header *rthdr = 1984 (struct ieee80211_radiotap_header *) skb->data; 1985 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1986 struct ieee80211_supported_band *sband = 1987 local->hw.wiphy->bands[info->band]; 1988 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 1989 NULL); 1990 u16 txflags; 1991 u16 rate = 0; 1992 bool rate_found = false; 1993 u8 rate_retries = 0; 1994 u16 rate_flags = 0; 1995 u8 mcs_known, mcs_flags, mcs_bw; 1996 u16 vht_known; 1997 u8 vht_mcs = 0, vht_nss = 0; 1998 int i; 1999 2000 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2001 IEEE80211_TX_CTL_DONTFRAG; 2002 2003 /* 2004 * for every radiotap entry that is present 2005 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2006 * entries present, or -EINVAL on error) 2007 */ 2008 2009 while (!ret) { 2010 ret = ieee80211_radiotap_iterator_next(&iterator); 2011 2012 if (ret) 2013 continue; 2014 2015 /* see if this argument is something we can use */ 2016 switch (iterator.this_arg_index) { 2017 /* 2018 * You must take care when dereferencing iterator.this_arg 2019 * for multibyte types... the pointer is not aligned. Use 2020 * get_unaligned((type *)iterator.this_arg) to dereference 2021 * iterator.this_arg for type "type" safely on all arches. 2022 */ 2023 case IEEE80211_RADIOTAP_FLAGS: 2024 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2025 /* 2026 * this indicates that the skb we have been 2027 * handed has the 32-bit FCS CRC at the end... 2028 * we should react to that by snipping it off 2029 * because it will be recomputed and added 2030 * on transmission 2031 */ 2032 if (skb->len < (iterator._max_length + FCS_LEN)) 2033 return false; 2034 2035 skb_trim(skb, skb->len - FCS_LEN); 2036 } 2037 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2038 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2039 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2040 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2041 break; 2042 2043 case IEEE80211_RADIOTAP_TX_FLAGS: 2044 txflags = get_unaligned_le16(iterator.this_arg); 2045 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2046 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2047 break; 2048 2049 case IEEE80211_RADIOTAP_RATE: 2050 rate = *iterator.this_arg; 2051 rate_flags = 0; 2052 rate_found = true; 2053 break; 2054 2055 case IEEE80211_RADIOTAP_DATA_RETRIES: 2056 rate_retries = *iterator.this_arg; 2057 break; 2058 2059 case IEEE80211_RADIOTAP_MCS: 2060 mcs_known = iterator.this_arg[0]; 2061 mcs_flags = iterator.this_arg[1]; 2062 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2063 break; 2064 2065 rate_found = true; 2066 rate = iterator.this_arg[2]; 2067 rate_flags = IEEE80211_TX_RC_MCS; 2068 2069 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2070 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2071 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2072 2073 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2074 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2075 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2076 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2077 break; 2078 2079 case IEEE80211_RADIOTAP_VHT: 2080 vht_known = get_unaligned_le16(iterator.this_arg); 2081 rate_found = true; 2082 2083 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2084 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2085 (iterator.this_arg[2] & 2086 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2087 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2088 if (vht_known & 2089 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2090 if (iterator.this_arg[3] == 1) 2091 rate_flags |= 2092 IEEE80211_TX_RC_40_MHZ_WIDTH; 2093 else if (iterator.this_arg[3] == 4) 2094 rate_flags |= 2095 IEEE80211_TX_RC_80_MHZ_WIDTH; 2096 else if (iterator.this_arg[3] == 11) 2097 rate_flags |= 2098 IEEE80211_TX_RC_160_MHZ_WIDTH; 2099 } 2100 2101 vht_mcs = iterator.this_arg[4] >> 4; 2102 vht_nss = iterator.this_arg[4] & 0xF; 2103 break; 2104 2105 /* 2106 * Please update the file 2107 * Documentation/networking/mac80211-injection.txt 2108 * when parsing new fields here. 2109 */ 2110 2111 default: 2112 break; 2113 } 2114 } 2115 2116 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2117 return false; 2118 2119 if (rate_found) { 2120 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2121 2122 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2123 info->control.rates[i].idx = -1; 2124 info->control.rates[i].flags = 0; 2125 info->control.rates[i].count = 0; 2126 } 2127 2128 if (rate_flags & IEEE80211_TX_RC_MCS) { 2129 info->control.rates[0].idx = rate; 2130 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2131 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2132 vht_nss); 2133 } else { 2134 for (i = 0; i < sband->n_bitrates; i++) { 2135 if (rate * 5 != sband->bitrates[i].bitrate) 2136 continue; 2137 2138 info->control.rates[0].idx = i; 2139 break; 2140 } 2141 } 2142 2143 if (info->control.rates[0].idx < 0) 2144 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2145 2146 info->control.rates[0].flags = rate_flags; 2147 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2148 local->hw.max_rate_tries); 2149 } 2150 2151 /* 2152 * remove the radiotap header 2153 * iterator->_max_length was sanity-checked against 2154 * skb->len by iterator init 2155 */ 2156 skb_pull(skb, iterator._max_length); 2157 2158 return true; 2159 } 2160 2161 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2162 struct net_device *dev) 2163 { 2164 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2165 struct ieee80211_chanctx_conf *chanctx_conf; 2166 struct ieee80211_radiotap_header *prthdr = 2167 (struct ieee80211_radiotap_header *)skb->data; 2168 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2169 struct ieee80211_hdr *hdr; 2170 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2171 struct cfg80211_chan_def *chandef; 2172 u16 len_rthdr; 2173 int hdrlen; 2174 2175 /* check for not even having the fixed radiotap header part */ 2176 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2177 goto fail; /* too short to be possibly valid */ 2178 2179 /* is it a header version we can trust to find length from? */ 2180 if (unlikely(prthdr->it_version)) 2181 goto fail; /* only version 0 is supported */ 2182 2183 /* then there must be a radiotap header with a length we can use */ 2184 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2185 2186 /* does the skb contain enough to deliver on the alleged length? */ 2187 if (unlikely(skb->len < len_rthdr)) 2188 goto fail; /* skb too short for claimed rt header extent */ 2189 2190 /* 2191 * fix up the pointers accounting for the radiotap 2192 * header still being in there. We are being given 2193 * a precooked IEEE80211 header so no need for 2194 * normal processing 2195 */ 2196 skb_set_mac_header(skb, len_rthdr); 2197 /* 2198 * these are just fixed to the end of the rt area since we 2199 * don't have any better information and at this point, nobody cares 2200 */ 2201 skb_set_network_header(skb, len_rthdr); 2202 skb_set_transport_header(skb, len_rthdr); 2203 2204 if (skb->len < len_rthdr + 2) 2205 goto fail; 2206 2207 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2208 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2209 2210 if (skb->len < len_rthdr + hdrlen) 2211 goto fail; 2212 2213 /* 2214 * Initialize skb->protocol if the injected frame is a data frame 2215 * carrying a rfc1042 header 2216 */ 2217 if (ieee80211_is_data(hdr->frame_control) && 2218 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2219 u8 *payload = (u8 *)hdr + hdrlen; 2220 2221 if (ether_addr_equal(payload, rfc1042_header)) 2222 skb->protocol = cpu_to_be16((payload[6] << 8) | 2223 payload[7]); 2224 } 2225 2226 memset(info, 0, sizeof(*info)); 2227 2228 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2229 IEEE80211_TX_CTL_INJECTED; 2230 2231 rcu_read_lock(); 2232 2233 /* 2234 * We process outgoing injected frames that have a local address 2235 * we handle as though they are non-injected frames. 2236 * This code here isn't entirely correct, the local MAC address 2237 * isn't always enough to find the interface to use; for proper 2238 * VLAN/WDS support we will need a different mechanism (which 2239 * likely isn't going to be monitor interfaces). 2240 */ 2241 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2242 2243 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2244 if (!ieee80211_sdata_running(tmp_sdata)) 2245 continue; 2246 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2247 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2248 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2249 continue; 2250 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2251 sdata = tmp_sdata; 2252 break; 2253 } 2254 } 2255 2256 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2257 if (!chanctx_conf) { 2258 tmp_sdata = rcu_dereference(local->monitor_sdata); 2259 if (tmp_sdata) 2260 chanctx_conf = 2261 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2262 } 2263 2264 if (chanctx_conf) 2265 chandef = &chanctx_conf->def; 2266 else if (!local->use_chanctx) 2267 chandef = &local->_oper_chandef; 2268 else 2269 goto fail_rcu; 2270 2271 /* 2272 * Frame injection is not allowed if beaconing is not allowed 2273 * or if we need radar detection. Beaconing is usually not allowed when 2274 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2275 * Passive scan is also used in world regulatory domains where 2276 * your country is not known and as such it should be treated as 2277 * NO TX unless the channel is explicitly allowed in which case 2278 * your current regulatory domain would not have the passive scan 2279 * flag. 2280 * 2281 * Since AP mode uses monitor interfaces to inject/TX management 2282 * frames we can make AP mode the exception to this rule once it 2283 * supports radar detection as its implementation can deal with 2284 * radar detection by itself. We can do that later by adding a 2285 * monitor flag interfaces used for AP support. 2286 */ 2287 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2288 sdata->vif.type)) 2289 goto fail_rcu; 2290 2291 info->band = chandef->chan->band; 2292 2293 /* process and remove the injection radiotap header */ 2294 if (!ieee80211_parse_tx_radiotap(local, skb)) 2295 goto fail_rcu; 2296 2297 ieee80211_xmit(sdata, NULL, skb, 0); 2298 rcu_read_unlock(); 2299 2300 return NETDEV_TX_OK; 2301 2302 fail_rcu: 2303 rcu_read_unlock(); 2304 fail: 2305 dev_kfree_skb(skb); 2306 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2307 } 2308 2309 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2310 { 2311 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2312 2313 return ethertype == ETH_P_TDLS && 2314 skb->len > 14 && 2315 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2316 } 2317 2318 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2319 struct sk_buff *skb, 2320 struct sta_info **sta_out) 2321 { 2322 struct sta_info *sta; 2323 2324 switch (sdata->vif.type) { 2325 case NL80211_IFTYPE_AP_VLAN: 2326 sta = rcu_dereference(sdata->u.vlan.sta); 2327 if (sta) { 2328 *sta_out = sta; 2329 return 0; 2330 } else if (sdata->wdev.use_4addr) { 2331 return -ENOLINK; 2332 } 2333 /* fall through */ 2334 case NL80211_IFTYPE_AP: 2335 case NL80211_IFTYPE_OCB: 2336 case NL80211_IFTYPE_ADHOC: 2337 if (is_multicast_ether_addr(skb->data)) { 2338 *sta_out = ERR_PTR(-ENOENT); 2339 return 0; 2340 } 2341 sta = sta_info_get_bss(sdata, skb->data); 2342 break; 2343 case NL80211_IFTYPE_WDS: 2344 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2345 break; 2346 #ifdef CONFIG_MAC80211_MESH 2347 case NL80211_IFTYPE_MESH_POINT: 2348 /* determined much later */ 2349 *sta_out = NULL; 2350 return 0; 2351 #endif 2352 case NL80211_IFTYPE_STATION: 2353 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2354 sta = sta_info_get(sdata, skb->data); 2355 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2356 if (test_sta_flag(sta, 2357 WLAN_STA_TDLS_PEER_AUTH)) { 2358 *sta_out = sta; 2359 return 0; 2360 } 2361 2362 /* 2363 * TDLS link during setup - throw out frames to 2364 * peer. Allow TDLS-setup frames to unauthorized 2365 * peers for the special case of a link teardown 2366 * after a TDLS sta is removed due to being 2367 * unreachable. 2368 */ 2369 if (!ieee80211_is_tdls_setup(skb)) 2370 return -EINVAL; 2371 } 2372 2373 } 2374 2375 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2376 if (!sta) 2377 return -ENOLINK; 2378 break; 2379 default: 2380 return -EINVAL; 2381 } 2382 2383 *sta_out = sta ?: ERR_PTR(-ENOENT); 2384 return 0; 2385 } 2386 2387 /** 2388 * ieee80211_build_hdr - build 802.11 header in the given frame 2389 * @sdata: virtual interface to build the header for 2390 * @skb: the skb to build the header in 2391 * @info_flags: skb flags to set 2392 * 2393 * This function takes the skb with 802.3 header and reformats the header to 2394 * the appropriate IEEE 802.11 header based on which interface the packet is 2395 * being transmitted on. 2396 * 2397 * Note that this function also takes care of the TX status request and 2398 * potential unsharing of the SKB - this needs to be interleaved with the 2399 * header building. 2400 * 2401 * The function requires the read-side RCU lock held 2402 * 2403 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2404 */ 2405 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2406 struct sk_buff *skb, u32 info_flags, 2407 struct sta_info *sta) 2408 { 2409 struct ieee80211_local *local = sdata->local; 2410 struct ieee80211_tx_info *info; 2411 int head_need; 2412 u16 ethertype, hdrlen, meshhdrlen = 0; 2413 __le16 fc; 2414 struct ieee80211_hdr hdr; 2415 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2416 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2417 const u8 *encaps_data; 2418 int encaps_len, skip_header_bytes; 2419 bool wme_sta = false, authorized = false; 2420 bool tdls_peer; 2421 bool multicast; 2422 u16 info_id = 0; 2423 struct ieee80211_chanctx_conf *chanctx_conf; 2424 struct ieee80211_sub_if_data *ap_sdata; 2425 enum nl80211_band band; 2426 int ret; 2427 2428 if (IS_ERR(sta)) 2429 sta = NULL; 2430 2431 /* convert Ethernet header to proper 802.11 header (based on 2432 * operation mode) */ 2433 ethertype = (skb->data[12] << 8) | skb->data[13]; 2434 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2435 2436 switch (sdata->vif.type) { 2437 case NL80211_IFTYPE_AP_VLAN: 2438 if (sdata->wdev.use_4addr) { 2439 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2440 /* RA TA DA SA */ 2441 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2442 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2443 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2444 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2445 hdrlen = 30; 2446 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2447 wme_sta = sta->sta.wme; 2448 } 2449 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2450 u.ap); 2451 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2452 if (!chanctx_conf) { 2453 ret = -ENOTCONN; 2454 goto free; 2455 } 2456 band = chanctx_conf->def.chan->band; 2457 if (sdata->wdev.use_4addr) 2458 break; 2459 /* fall through */ 2460 case NL80211_IFTYPE_AP: 2461 if (sdata->vif.type == NL80211_IFTYPE_AP) 2462 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2463 if (!chanctx_conf) { 2464 ret = -ENOTCONN; 2465 goto free; 2466 } 2467 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2468 /* DA BSSID SA */ 2469 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2470 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2471 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2472 hdrlen = 24; 2473 band = chanctx_conf->def.chan->band; 2474 break; 2475 case NL80211_IFTYPE_WDS: 2476 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2477 /* RA TA DA SA */ 2478 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2479 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2480 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2481 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2482 hdrlen = 30; 2483 /* 2484 * This is the exception! WDS style interfaces are prohibited 2485 * when channel contexts are in used so this must be valid 2486 */ 2487 band = local->hw.conf.chandef.chan->band; 2488 break; 2489 #ifdef CONFIG_MAC80211_MESH 2490 case NL80211_IFTYPE_MESH_POINT: 2491 if (!is_multicast_ether_addr(skb->data)) { 2492 struct sta_info *next_hop; 2493 bool mpp_lookup = true; 2494 2495 mpath = mesh_path_lookup(sdata, skb->data); 2496 if (mpath) { 2497 mpp_lookup = false; 2498 next_hop = rcu_dereference(mpath->next_hop); 2499 if (!next_hop || 2500 !(mpath->flags & (MESH_PATH_ACTIVE | 2501 MESH_PATH_RESOLVING))) 2502 mpp_lookup = true; 2503 } 2504 2505 if (mpp_lookup) { 2506 mppath = mpp_path_lookup(sdata, skb->data); 2507 if (mppath) 2508 mppath->exp_time = jiffies; 2509 } 2510 2511 if (mppath && mpath) 2512 mesh_path_del(sdata, mpath->dst); 2513 } 2514 2515 /* 2516 * Use address extension if it is a packet from 2517 * another interface or if we know the destination 2518 * is being proxied by a portal (i.e. portal address 2519 * differs from proxied address) 2520 */ 2521 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2522 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2523 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2524 skb->data, skb->data + ETH_ALEN); 2525 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2526 NULL, NULL); 2527 } else { 2528 /* DS -> MBSS (802.11-2012 13.11.3.3). 2529 * For unicast with unknown forwarding information, 2530 * destination might be in the MBSS or if that fails 2531 * forwarded to another mesh gate. In either case 2532 * resolution will be handled in ieee80211_xmit(), so 2533 * leave the original DA. This also works for mcast */ 2534 const u8 *mesh_da = skb->data; 2535 2536 if (mppath) 2537 mesh_da = mppath->mpp; 2538 else if (mpath) 2539 mesh_da = mpath->dst; 2540 2541 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2542 mesh_da, sdata->vif.addr); 2543 if (is_multicast_ether_addr(mesh_da)) 2544 /* DA TA mSA AE:SA */ 2545 meshhdrlen = ieee80211_new_mesh_header( 2546 sdata, &mesh_hdr, 2547 skb->data + ETH_ALEN, NULL); 2548 else 2549 /* RA TA mDA mSA AE:DA SA */ 2550 meshhdrlen = ieee80211_new_mesh_header( 2551 sdata, &mesh_hdr, skb->data, 2552 skb->data + ETH_ALEN); 2553 2554 } 2555 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2556 if (!chanctx_conf) { 2557 ret = -ENOTCONN; 2558 goto free; 2559 } 2560 band = chanctx_conf->def.chan->band; 2561 break; 2562 #endif 2563 case NL80211_IFTYPE_STATION: 2564 /* we already did checks when looking up the RA STA */ 2565 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2566 2567 if (tdls_peer) { 2568 /* DA SA BSSID */ 2569 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2570 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2571 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2572 hdrlen = 24; 2573 } else if (sdata->u.mgd.use_4addr && 2574 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2575 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2576 IEEE80211_FCTL_TODS); 2577 /* RA TA DA SA */ 2578 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2579 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2580 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2581 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2582 hdrlen = 30; 2583 } else { 2584 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2585 /* BSSID SA DA */ 2586 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2587 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2588 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2589 hdrlen = 24; 2590 } 2591 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2592 if (!chanctx_conf) { 2593 ret = -ENOTCONN; 2594 goto free; 2595 } 2596 band = chanctx_conf->def.chan->band; 2597 break; 2598 case NL80211_IFTYPE_OCB: 2599 /* DA SA BSSID */ 2600 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2601 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2602 eth_broadcast_addr(hdr.addr3); 2603 hdrlen = 24; 2604 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2605 if (!chanctx_conf) { 2606 ret = -ENOTCONN; 2607 goto free; 2608 } 2609 band = chanctx_conf->def.chan->band; 2610 break; 2611 case NL80211_IFTYPE_ADHOC: 2612 /* DA SA BSSID */ 2613 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2614 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2615 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2616 hdrlen = 24; 2617 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2618 if (!chanctx_conf) { 2619 ret = -ENOTCONN; 2620 goto free; 2621 } 2622 band = chanctx_conf->def.chan->band; 2623 break; 2624 default: 2625 ret = -EINVAL; 2626 goto free; 2627 } 2628 2629 multicast = is_multicast_ether_addr(hdr.addr1); 2630 2631 /* sta is always NULL for mesh */ 2632 if (sta) { 2633 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2634 wme_sta = sta->sta.wme; 2635 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2636 /* For mesh, the use of the QoS header is mandatory */ 2637 wme_sta = true; 2638 } 2639 2640 /* receiver does QoS (which also means we do) use it */ 2641 if (wme_sta) { 2642 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2643 hdrlen += 2; 2644 } 2645 2646 /* 2647 * Drop unicast frames to unauthorised stations unless they are 2648 * EAPOL frames from the local station. 2649 */ 2650 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2651 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2652 !multicast && !authorized && 2653 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2654 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2655 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2656 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2657 sdata->name, hdr.addr1); 2658 #endif 2659 2660 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2661 2662 ret = -EPERM; 2663 goto free; 2664 } 2665 2666 if (unlikely(!multicast && skb->sk && 2667 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2668 struct sk_buff *ack_skb = skb_clone_sk(skb); 2669 2670 if (ack_skb) { 2671 unsigned long flags; 2672 int id; 2673 2674 spin_lock_irqsave(&local->ack_status_lock, flags); 2675 id = idr_alloc(&local->ack_status_frames, ack_skb, 2676 1, 0x10000, GFP_ATOMIC); 2677 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2678 2679 if (id >= 0) { 2680 info_id = id; 2681 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2682 } else { 2683 kfree_skb(ack_skb); 2684 } 2685 } 2686 } 2687 2688 /* 2689 * If the skb is shared we need to obtain our own copy. 2690 */ 2691 if (skb_shared(skb)) { 2692 struct sk_buff *tmp_skb = skb; 2693 2694 /* can't happen -- skb is a clone if info_id != 0 */ 2695 WARN_ON(info_id); 2696 2697 skb = skb_clone(skb, GFP_ATOMIC); 2698 kfree_skb(tmp_skb); 2699 2700 if (!skb) { 2701 ret = -ENOMEM; 2702 goto free; 2703 } 2704 } 2705 2706 hdr.frame_control = fc; 2707 hdr.duration_id = 0; 2708 hdr.seq_ctrl = 0; 2709 2710 skip_header_bytes = ETH_HLEN; 2711 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2712 encaps_data = bridge_tunnel_header; 2713 encaps_len = sizeof(bridge_tunnel_header); 2714 skip_header_bytes -= 2; 2715 } else if (ethertype >= ETH_P_802_3_MIN) { 2716 encaps_data = rfc1042_header; 2717 encaps_len = sizeof(rfc1042_header); 2718 skip_header_bytes -= 2; 2719 } else { 2720 encaps_data = NULL; 2721 encaps_len = 0; 2722 } 2723 2724 skb_pull(skb, skip_header_bytes); 2725 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2726 2727 /* 2728 * So we need to modify the skb header and hence need a copy of 2729 * that. The head_need variable above doesn't, so far, include 2730 * the needed header space that we don't need right away. If we 2731 * can, then we don't reallocate right now but only after the 2732 * frame arrives at the master device (if it does...) 2733 * 2734 * If we cannot, however, then we will reallocate to include all 2735 * the ever needed space. Also, if we need to reallocate it anyway, 2736 * make it big enough for everything we may ever need. 2737 */ 2738 2739 if (head_need > 0 || skb_cloned(skb)) { 2740 head_need += sdata->encrypt_headroom; 2741 head_need += local->tx_headroom; 2742 head_need = max_t(int, 0, head_need); 2743 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2744 ieee80211_free_txskb(&local->hw, skb); 2745 skb = NULL; 2746 return ERR_PTR(-ENOMEM); 2747 } 2748 } 2749 2750 if (encaps_data) 2751 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2752 2753 #ifdef CONFIG_MAC80211_MESH 2754 if (meshhdrlen > 0) 2755 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2756 #endif 2757 2758 if (ieee80211_is_data_qos(fc)) { 2759 __le16 *qos_control; 2760 2761 qos_control = skb_push(skb, 2); 2762 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2763 /* 2764 * Maybe we could actually set some fields here, for now just 2765 * initialise to zero to indicate no special operation. 2766 */ 2767 *qos_control = 0; 2768 } else 2769 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2770 2771 skb_reset_mac_header(skb); 2772 2773 info = IEEE80211_SKB_CB(skb); 2774 memset(info, 0, sizeof(*info)); 2775 2776 info->flags = info_flags; 2777 info->ack_frame_id = info_id; 2778 info->band = band; 2779 2780 return skb; 2781 free: 2782 kfree_skb(skb); 2783 return ERR_PTR(ret); 2784 } 2785 2786 /* 2787 * fast-xmit overview 2788 * 2789 * The core idea of this fast-xmit is to remove per-packet checks by checking 2790 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2791 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2792 * much less work can be done per packet. For example, fragmentation must be 2793 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2794 * in the code here. 2795 * 2796 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2797 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2798 * 2799 * The most difficult part of this is that when any of these assumptions 2800 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2801 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2802 * since the per-packet code no longer checks the conditions. This is reflected 2803 * by the calls to these functions throughout the rest of the code, and must be 2804 * maintained if any of the TX path checks change. 2805 */ 2806 2807 void ieee80211_check_fast_xmit(struct sta_info *sta) 2808 { 2809 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2810 struct ieee80211_local *local = sta->local; 2811 struct ieee80211_sub_if_data *sdata = sta->sdata; 2812 struct ieee80211_hdr *hdr = (void *)build.hdr; 2813 struct ieee80211_chanctx_conf *chanctx_conf; 2814 __le16 fc; 2815 2816 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2817 return; 2818 2819 /* Locking here protects both the pointer itself, and against concurrent 2820 * invocations winning data access races to, e.g., the key pointer that 2821 * is used. 2822 * Without it, the invocation of this function right after the key 2823 * pointer changes wouldn't be sufficient, as another CPU could access 2824 * the pointer, then stall, and then do the cache update after the CPU 2825 * that invalidated the key. 2826 * With the locking, such scenarios cannot happen as the check for the 2827 * key and the fast-tx assignment are done atomically, so the CPU that 2828 * modifies the key will either wait or other one will see the key 2829 * cleared/changed already. 2830 */ 2831 spin_lock_bh(&sta->lock); 2832 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2833 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2834 sdata->vif.type == NL80211_IFTYPE_STATION) 2835 goto out; 2836 2837 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2838 goto out; 2839 2840 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2841 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2842 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2843 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2844 goto out; 2845 2846 if (sdata->noack_map) 2847 goto out; 2848 2849 /* fast-xmit doesn't handle fragmentation at all */ 2850 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2851 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2852 goto out; 2853 2854 rcu_read_lock(); 2855 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2856 if (!chanctx_conf) { 2857 rcu_read_unlock(); 2858 goto out; 2859 } 2860 build.band = chanctx_conf->def.chan->band; 2861 rcu_read_unlock(); 2862 2863 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2864 2865 switch (sdata->vif.type) { 2866 case NL80211_IFTYPE_ADHOC: 2867 /* DA SA BSSID */ 2868 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2869 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2870 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2871 build.hdr_len = 24; 2872 break; 2873 case NL80211_IFTYPE_STATION: 2874 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2875 /* DA SA BSSID */ 2876 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2877 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2878 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2879 build.hdr_len = 24; 2880 break; 2881 } 2882 2883 if (sdata->u.mgd.use_4addr) { 2884 /* non-regular ethertype cannot use the fastpath */ 2885 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2886 IEEE80211_FCTL_TODS); 2887 /* RA TA DA SA */ 2888 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2889 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2890 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2891 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2892 build.hdr_len = 30; 2893 break; 2894 } 2895 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2896 /* BSSID SA DA */ 2897 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2898 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2899 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2900 build.hdr_len = 24; 2901 break; 2902 case NL80211_IFTYPE_AP_VLAN: 2903 if (sdata->wdev.use_4addr) { 2904 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2905 IEEE80211_FCTL_TODS); 2906 /* RA TA DA SA */ 2907 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2908 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2909 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2910 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2911 build.hdr_len = 30; 2912 break; 2913 } 2914 /* fall through */ 2915 case NL80211_IFTYPE_AP: 2916 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2917 /* DA BSSID SA */ 2918 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2919 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2920 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2921 build.hdr_len = 24; 2922 break; 2923 default: 2924 /* not handled on fast-xmit */ 2925 goto out; 2926 } 2927 2928 if (sta->sta.wme) { 2929 build.hdr_len += 2; 2930 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2931 } 2932 2933 /* We store the key here so there's no point in using rcu_dereference() 2934 * but that's fine because the code that changes the pointers will call 2935 * this function after doing so. For a single CPU that would be enough, 2936 * for multiple see the comment above. 2937 */ 2938 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2939 if (!build.key) 2940 build.key = rcu_access_pointer(sdata->default_unicast_key); 2941 if (build.key) { 2942 bool gen_iv, iv_spc, mmic; 2943 2944 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2945 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 2946 mmic = build.key->conf.flags & 2947 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 2948 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 2949 2950 /* don't handle software crypto */ 2951 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 2952 goto out; 2953 2954 switch (build.key->conf.cipher) { 2955 case WLAN_CIPHER_SUITE_CCMP: 2956 case WLAN_CIPHER_SUITE_CCMP_256: 2957 /* add fixed key ID */ 2958 if (gen_iv) { 2959 (build.hdr + build.hdr_len)[3] = 2960 0x20 | (build.key->conf.keyidx << 6); 2961 build.pn_offs = build.hdr_len; 2962 } 2963 if (gen_iv || iv_spc) 2964 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 2965 break; 2966 case WLAN_CIPHER_SUITE_GCMP: 2967 case WLAN_CIPHER_SUITE_GCMP_256: 2968 /* add fixed key ID */ 2969 if (gen_iv) { 2970 (build.hdr + build.hdr_len)[3] = 2971 0x20 | (build.key->conf.keyidx << 6); 2972 build.pn_offs = build.hdr_len; 2973 } 2974 if (gen_iv || iv_spc) 2975 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 2976 break; 2977 case WLAN_CIPHER_SUITE_TKIP: 2978 /* cannot handle MMIC or IV generation in xmit-fast */ 2979 if (mmic || gen_iv) 2980 goto out; 2981 if (iv_spc) 2982 build.hdr_len += IEEE80211_TKIP_IV_LEN; 2983 break; 2984 case WLAN_CIPHER_SUITE_WEP40: 2985 case WLAN_CIPHER_SUITE_WEP104: 2986 /* cannot handle IV generation in fast-xmit */ 2987 if (gen_iv) 2988 goto out; 2989 if (iv_spc) 2990 build.hdr_len += IEEE80211_WEP_IV_LEN; 2991 break; 2992 case WLAN_CIPHER_SUITE_AES_CMAC: 2993 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 2994 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 2995 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 2996 WARN(1, 2997 "management cipher suite 0x%x enabled for data\n", 2998 build.key->conf.cipher); 2999 goto out; 3000 default: 3001 /* we don't know how to generate IVs for this at all */ 3002 if (WARN_ON(gen_iv)) 3003 goto out; 3004 /* pure hardware keys are OK, of course */ 3005 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3006 break; 3007 /* cipher scheme might require space allocation */ 3008 if (iv_spc && 3009 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3010 goto out; 3011 if (iv_spc) 3012 build.hdr_len += build.key->conf.iv_len; 3013 } 3014 3015 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3016 } 3017 3018 hdr->frame_control = fc; 3019 3020 memcpy(build.hdr + build.hdr_len, 3021 rfc1042_header, sizeof(rfc1042_header)); 3022 build.hdr_len += sizeof(rfc1042_header); 3023 3024 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3025 /* if the kmemdup fails, continue w/o fast_tx */ 3026 if (!fast_tx) 3027 goto out; 3028 3029 out: 3030 /* we might have raced against another call to this function */ 3031 old = rcu_dereference_protected(sta->fast_tx, 3032 lockdep_is_held(&sta->lock)); 3033 rcu_assign_pointer(sta->fast_tx, fast_tx); 3034 if (old) 3035 kfree_rcu(old, rcu_head); 3036 spin_unlock_bh(&sta->lock); 3037 } 3038 3039 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3040 { 3041 struct sta_info *sta; 3042 3043 rcu_read_lock(); 3044 list_for_each_entry_rcu(sta, &local->sta_list, list) 3045 ieee80211_check_fast_xmit(sta); 3046 rcu_read_unlock(); 3047 } 3048 3049 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3050 { 3051 struct ieee80211_local *local = sdata->local; 3052 struct sta_info *sta; 3053 3054 rcu_read_lock(); 3055 3056 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3057 if (sdata != sta->sdata && 3058 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3059 continue; 3060 ieee80211_check_fast_xmit(sta); 3061 } 3062 3063 rcu_read_unlock(); 3064 } 3065 3066 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3067 { 3068 struct ieee80211_fast_tx *fast_tx; 3069 3070 spin_lock_bh(&sta->lock); 3071 fast_tx = rcu_dereference_protected(sta->fast_tx, 3072 lockdep_is_held(&sta->lock)); 3073 RCU_INIT_POINTER(sta->fast_tx, NULL); 3074 spin_unlock_bh(&sta->lock); 3075 3076 if (fast_tx) 3077 kfree_rcu(fast_tx, rcu_head); 3078 } 3079 3080 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3081 struct sk_buff *skb, int headroom, 3082 int *subframe_len) 3083 { 3084 int amsdu_len = *subframe_len + sizeof(struct ethhdr); 3085 int padding = (4 - amsdu_len) & 3; 3086 3087 if (skb_headroom(skb) < headroom || skb_tailroom(skb) < padding) { 3088 I802_DEBUG_INC(local->tx_expand_skb_head); 3089 3090 if (pskb_expand_head(skb, headroom, padding, GFP_ATOMIC)) { 3091 wiphy_debug(local->hw.wiphy, 3092 "failed to reallocate TX buffer\n"); 3093 return false; 3094 } 3095 } 3096 3097 if (padding) { 3098 *subframe_len += padding; 3099 skb_put_zero(skb, padding); 3100 } 3101 3102 return true; 3103 } 3104 3105 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3106 struct ieee80211_fast_tx *fast_tx, 3107 struct sk_buff *skb) 3108 { 3109 struct ieee80211_local *local = sdata->local; 3110 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3111 struct ieee80211_hdr *hdr; 3112 struct ethhdr *amsdu_hdr; 3113 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3114 int subframe_len = skb->len - hdr_len; 3115 void *data; 3116 u8 *qc, *h_80211_src, *h_80211_dst; 3117 const u8 *bssid; 3118 3119 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3120 return false; 3121 3122 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3123 return true; 3124 3125 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr), 3126 &subframe_len)) 3127 return false; 3128 3129 data = skb_push(skb, sizeof(*amsdu_hdr)); 3130 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3131 hdr = data; 3132 amsdu_hdr = data + hdr_len; 3133 /* h_80211_src/dst is addr* field within hdr */ 3134 h_80211_src = data + fast_tx->sa_offs; 3135 h_80211_dst = data + fast_tx->da_offs; 3136 3137 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3138 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3139 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3140 3141 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3142 * fields needs to be changed to BSSID for A-MSDU frames depending 3143 * on FromDS/ToDS values. 3144 */ 3145 switch (sdata->vif.type) { 3146 case NL80211_IFTYPE_STATION: 3147 bssid = sdata->u.mgd.bssid; 3148 break; 3149 case NL80211_IFTYPE_AP: 3150 case NL80211_IFTYPE_AP_VLAN: 3151 bssid = sdata->vif.addr; 3152 break; 3153 default: 3154 bssid = NULL; 3155 } 3156 3157 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3158 ether_addr_copy(h_80211_src, bssid); 3159 3160 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3161 ether_addr_copy(h_80211_dst, bssid); 3162 3163 qc = ieee80211_get_qos_ctl(hdr); 3164 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3165 3166 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3167 3168 return true; 3169 } 3170 3171 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3172 struct sta_info *sta, 3173 struct ieee80211_fast_tx *fast_tx, 3174 struct sk_buff *skb) 3175 { 3176 struct ieee80211_local *local = sdata->local; 3177 struct fq *fq = &local->fq; 3178 struct fq_tin *tin; 3179 struct fq_flow *flow; 3180 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3181 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3182 struct txq_info *txqi; 3183 struct sk_buff **frag_tail, *head; 3184 int subframe_len = skb->len - ETH_ALEN; 3185 u8 max_subframes = sta->sta.max_amsdu_subframes; 3186 int max_frags = local->hw.max_tx_fragments; 3187 int max_amsdu_len = sta->sta.max_amsdu_len; 3188 __be16 len; 3189 void *data; 3190 bool ret = false; 3191 unsigned int orig_len; 3192 int n = 1, nfrags; 3193 3194 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3195 return false; 3196 3197 if (!txq) 3198 return false; 3199 3200 txqi = to_txq_info(txq); 3201 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3202 return false; 3203 3204 if (sta->sta.max_rc_amsdu_len) 3205 max_amsdu_len = min_t(int, max_amsdu_len, 3206 sta->sta.max_rc_amsdu_len); 3207 3208 spin_lock_bh(&fq->lock); 3209 3210 /* TODO: Ideally aggregation should be done on dequeue to remain 3211 * responsive to environment changes. 3212 */ 3213 3214 tin = &txqi->tin; 3215 flow = fq_flow_classify(fq, tin, skb, fq_flow_get_default_func); 3216 head = skb_peek_tail(&flow->queue); 3217 if (!head) 3218 goto out; 3219 3220 orig_len = head->len; 3221 3222 if (skb->len + head->len > max_amsdu_len) 3223 goto out; 3224 3225 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3226 goto out; 3227 3228 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3229 nfrags += 1 + skb_shinfo(head)->nr_frags; 3230 frag_tail = &skb_shinfo(head)->frag_list; 3231 while (*frag_tail) { 3232 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3233 frag_tail = &(*frag_tail)->next; 3234 n++; 3235 } 3236 3237 if (max_subframes && n > max_subframes) 3238 goto out; 3239 3240 if (max_frags && nfrags > max_frags) 3241 goto out; 3242 3243 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 2, 3244 &subframe_len)) 3245 goto out; 3246 3247 ret = true; 3248 data = skb_push(skb, ETH_ALEN + 2); 3249 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3250 3251 data += 2 * ETH_ALEN; 3252 len = cpu_to_be16(subframe_len); 3253 memcpy(data, &len, 2); 3254 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3255 3256 head->len += skb->len; 3257 head->data_len += skb->len; 3258 *frag_tail = skb; 3259 3260 flow->backlog += head->len - orig_len; 3261 tin->backlog_bytes += head->len - orig_len; 3262 3263 fq_recalc_backlog(fq, tin, flow); 3264 3265 out: 3266 spin_unlock_bh(&fq->lock); 3267 3268 return ret; 3269 } 3270 3271 /* 3272 * Can be called while the sta lock is held. Anything that can cause packets to 3273 * be generated will cause deadlock! 3274 */ 3275 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3276 struct sta_info *sta, u8 pn_offs, 3277 struct ieee80211_key *key, 3278 struct sk_buff *skb) 3279 { 3280 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3281 struct ieee80211_hdr *hdr = (void *)skb->data; 3282 u8 tid = IEEE80211_NUM_TIDS; 3283 3284 if (key) 3285 info->control.hw_key = &key->conf; 3286 3287 ieee80211_tx_stats(skb->dev, skb->len); 3288 3289 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3290 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3291 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3292 } else { 3293 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3294 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3295 sdata->sequence_number += 0x10; 3296 } 3297 3298 if (skb_shinfo(skb)->gso_size) 3299 sta->tx_stats.msdu[tid] += 3300 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3301 else 3302 sta->tx_stats.msdu[tid]++; 3303 3304 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3305 3306 /* statistics normally done by ieee80211_tx_h_stats (but that 3307 * has to consider fragmentation, so is more complex) 3308 */ 3309 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3310 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3311 3312 if (pn_offs) { 3313 u64 pn; 3314 u8 *crypto_hdr = skb->data + pn_offs; 3315 3316 switch (key->conf.cipher) { 3317 case WLAN_CIPHER_SUITE_CCMP: 3318 case WLAN_CIPHER_SUITE_CCMP_256: 3319 case WLAN_CIPHER_SUITE_GCMP: 3320 case WLAN_CIPHER_SUITE_GCMP_256: 3321 pn = atomic64_inc_return(&key->conf.tx_pn); 3322 crypto_hdr[0] = pn; 3323 crypto_hdr[1] = pn >> 8; 3324 crypto_hdr[4] = pn >> 16; 3325 crypto_hdr[5] = pn >> 24; 3326 crypto_hdr[6] = pn >> 32; 3327 crypto_hdr[7] = pn >> 40; 3328 break; 3329 } 3330 } 3331 } 3332 3333 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3334 struct sta_info *sta, 3335 struct ieee80211_fast_tx *fast_tx, 3336 struct sk_buff *skb) 3337 { 3338 struct ieee80211_local *local = sdata->local; 3339 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3340 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3341 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3342 struct ethhdr eth; 3343 struct ieee80211_tx_info *info; 3344 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3345 struct ieee80211_tx_data tx; 3346 ieee80211_tx_result r; 3347 struct tid_ampdu_tx *tid_tx = NULL; 3348 u8 tid = IEEE80211_NUM_TIDS; 3349 3350 /* control port protocol needs a lot of special handling */ 3351 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3352 return false; 3353 3354 /* only RFC 1042 SNAP */ 3355 if (ethertype < ETH_P_802_3_MIN) 3356 return false; 3357 3358 /* don't handle TX status request here either */ 3359 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3360 return false; 3361 3362 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3363 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3364 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3365 if (tid_tx) { 3366 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3367 return false; 3368 if (tid_tx->timeout) 3369 tid_tx->last_tx = jiffies; 3370 } 3371 } 3372 3373 /* after this point (skb is modified) we cannot return false */ 3374 3375 if (skb_shared(skb)) { 3376 struct sk_buff *tmp_skb = skb; 3377 3378 skb = skb_clone(skb, GFP_ATOMIC); 3379 kfree_skb(tmp_skb); 3380 3381 if (!skb) 3382 return true; 3383 } 3384 3385 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3386 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3387 return true; 3388 3389 /* will not be crypto-handled beyond what we do here, so use false 3390 * as the may-encrypt argument for the resize to not account for 3391 * more room than we already have in 'extra_head' 3392 */ 3393 if (unlikely(ieee80211_skb_resize(sdata, skb, 3394 max_t(int, extra_head + hw_headroom - 3395 skb_headroom(skb), 0), 3396 false))) { 3397 kfree_skb(skb); 3398 return true; 3399 } 3400 3401 memcpy(ð, skb->data, ETH_HLEN - 2); 3402 hdr = skb_push(skb, extra_head); 3403 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3404 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3405 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3406 3407 info = IEEE80211_SKB_CB(skb); 3408 memset(info, 0, sizeof(*info)); 3409 info->band = fast_tx->band; 3410 info->control.vif = &sdata->vif; 3411 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3412 IEEE80211_TX_CTL_DONTFRAG | 3413 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3414 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3415 3416 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3417 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3418 *ieee80211_get_qos_ctl(hdr) = tid; 3419 } 3420 3421 __skb_queue_head_init(&tx.skbs); 3422 3423 tx.flags = IEEE80211_TX_UNICAST; 3424 tx.local = local; 3425 tx.sdata = sdata; 3426 tx.sta = sta; 3427 tx.key = fast_tx->key; 3428 3429 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3430 tx.skb = skb; 3431 r = ieee80211_tx_h_rate_ctrl(&tx); 3432 skb = tx.skb; 3433 tx.skb = NULL; 3434 3435 if (r != TX_CONTINUE) { 3436 if (r != TX_QUEUED) 3437 kfree_skb(skb); 3438 return true; 3439 } 3440 } 3441 3442 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3443 return true; 3444 3445 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3446 fast_tx->key, skb); 3447 3448 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3449 sdata = container_of(sdata->bss, 3450 struct ieee80211_sub_if_data, u.ap); 3451 3452 __skb_queue_tail(&tx.skbs, skb); 3453 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3454 return true; 3455 } 3456 3457 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3458 struct ieee80211_txq *txq) 3459 { 3460 struct ieee80211_local *local = hw_to_local(hw); 3461 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3462 struct ieee80211_hdr *hdr; 3463 struct sk_buff *skb = NULL; 3464 struct fq *fq = &local->fq; 3465 struct fq_tin *tin = &txqi->tin; 3466 struct ieee80211_tx_info *info; 3467 struct ieee80211_tx_data tx; 3468 ieee80211_tx_result r; 3469 struct ieee80211_vif *vif; 3470 3471 spin_lock_bh(&fq->lock); 3472 3473 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags)) 3474 goto out; 3475 3476 /* Make sure fragments stay together. */ 3477 skb = __skb_dequeue(&txqi->frags); 3478 if (skb) 3479 goto out; 3480 3481 begin: 3482 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3483 if (!skb) 3484 goto out; 3485 3486 hdr = (struct ieee80211_hdr *)skb->data; 3487 info = IEEE80211_SKB_CB(skb); 3488 3489 memset(&tx, 0, sizeof(tx)); 3490 __skb_queue_head_init(&tx.skbs); 3491 tx.local = local; 3492 tx.skb = skb; 3493 tx.sdata = vif_to_sdata(info->control.vif); 3494 3495 if (txq->sta) 3496 tx.sta = container_of(txq->sta, struct sta_info, sta); 3497 3498 /* 3499 * The key can be removed while the packet was queued, so need to call 3500 * this here to get the current key. 3501 */ 3502 r = ieee80211_tx_h_select_key(&tx); 3503 if (r != TX_CONTINUE) { 3504 ieee80211_free_txskb(&local->hw, skb); 3505 goto begin; 3506 } 3507 3508 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3509 info->flags |= IEEE80211_TX_CTL_AMPDU; 3510 else 3511 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3512 3513 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3514 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3515 sta); 3516 u8 pn_offs = 0; 3517 3518 if (tx.key && 3519 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3520 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3521 3522 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3523 tx.key, skb); 3524 } else { 3525 if (invoke_tx_handlers_late(&tx)) 3526 goto begin; 3527 3528 skb = __skb_dequeue(&tx.skbs); 3529 3530 if (!skb_queue_empty(&tx.skbs)) 3531 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3532 } 3533 3534 if (skb && skb_has_frag_list(skb) && 3535 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3536 if (skb_linearize(skb)) { 3537 ieee80211_free_txskb(&local->hw, skb); 3538 goto begin; 3539 } 3540 } 3541 3542 switch (tx.sdata->vif.type) { 3543 case NL80211_IFTYPE_MONITOR: 3544 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3545 vif = &tx.sdata->vif; 3546 break; 3547 } 3548 tx.sdata = rcu_dereference(local->monitor_sdata); 3549 if (tx.sdata) { 3550 vif = &tx.sdata->vif; 3551 info->hw_queue = 3552 vif->hw_queue[skb_get_queue_mapping(skb)]; 3553 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3554 ieee80211_free_txskb(&local->hw, skb); 3555 goto begin; 3556 } else { 3557 vif = NULL; 3558 } 3559 break; 3560 case NL80211_IFTYPE_AP_VLAN: 3561 tx.sdata = container_of(tx.sdata->bss, 3562 struct ieee80211_sub_if_data, u.ap); 3563 /* fall through */ 3564 default: 3565 vif = &tx.sdata->vif; 3566 break; 3567 } 3568 3569 IEEE80211_SKB_CB(skb)->control.vif = vif; 3570 out: 3571 spin_unlock_bh(&fq->lock); 3572 3573 return skb; 3574 } 3575 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3576 3577 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3578 struct net_device *dev, 3579 u32 info_flags) 3580 { 3581 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3582 struct sta_info *sta; 3583 struct sk_buff *next; 3584 3585 if (unlikely(skb->len < ETH_HLEN)) { 3586 kfree_skb(skb); 3587 return; 3588 } 3589 3590 rcu_read_lock(); 3591 3592 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3593 goto out_free; 3594 3595 if (!IS_ERR_OR_NULL(sta)) { 3596 struct ieee80211_fast_tx *fast_tx; 3597 3598 /* We need a bit of data queued to build aggregates properly, so 3599 * instruct the TCP stack to allow more than a single ms of data 3600 * to be queued in the stack. The value is a bit-shift of 1 3601 * second, so 8 is ~4ms of queued data. Only affects local TCP 3602 * sockets. 3603 */ 3604 sk_pacing_shift_update(skb->sk, 8); 3605 3606 fast_tx = rcu_dereference(sta->fast_tx); 3607 3608 if (fast_tx && 3609 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3610 goto out; 3611 } 3612 3613 if (skb_is_gso(skb)) { 3614 struct sk_buff *segs; 3615 3616 segs = skb_gso_segment(skb, 0); 3617 if (IS_ERR(segs)) { 3618 goto out_free; 3619 } else if (segs) { 3620 consume_skb(skb); 3621 skb = segs; 3622 } 3623 } else { 3624 /* we cannot process non-linear frames on this path */ 3625 if (skb_linearize(skb)) { 3626 kfree_skb(skb); 3627 goto out; 3628 } 3629 3630 /* the frame could be fragmented, software-encrypted, and other 3631 * things so we cannot really handle checksum offload with it - 3632 * fix it up in software before we handle anything else. 3633 */ 3634 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3635 skb_set_transport_header(skb, 3636 skb_checksum_start_offset(skb)); 3637 if (skb_checksum_help(skb)) 3638 goto out_free; 3639 } 3640 } 3641 3642 next = skb; 3643 while (next) { 3644 skb = next; 3645 next = skb->next; 3646 3647 skb->prev = NULL; 3648 skb->next = NULL; 3649 3650 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3651 if (IS_ERR(skb)) 3652 goto out; 3653 3654 ieee80211_tx_stats(dev, skb->len); 3655 3656 ieee80211_xmit(sdata, sta, skb, 0); 3657 } 3658 goto out; 3659 out_free: 3660 kfree_skb(skb); 3661 out: 3662 rcu_read_unlock(); 3663 } 3664 3665 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3666 { 3667 struct ethhdr *eth; 3668 int err; 3669 3670 err = skb_ensure_writable(skb, ETH_HLEN); 3671 if (unlikely(err)) 3672 return err; 3673 3674 eth = (void *)skb->data; 3675 ether_addr_copy(eth->h_dest, sta->sta.addr); 3676 3677 return 0; 3678 } 3679 3680 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3681 struct net_device *dev) 3682 { 3683 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3684 const struct ethhdr *eth = (void *)skb->data; 3685 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3686 __be16 ethertype; 3687 3688 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3689 return false; 3690 3691 switch (sdata->vif.type) { 3692 case NL80211_IFTYPE_AP_VLAN: 3693 if (sdata->u.vlan.sta) 3694 return false; 3695 if (sdata->wdev.use_4addr) 3696 return false; 3697 /* fall through */ 3698 case NL80211_IFTYPE_AP: 3699 /* check runtime toggle for this bss */ 3700 if (!sdata->bss->multicast_to_unicast) 3701 return false; 3702 break; 3703 default: 3704 return false; 3705 } 3706 3707 /* multicast to unicast conversion only for some payload */ 3708 ethertype = eth->h_proto; 3709 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3710 ethertype = ethvlan->h_vlan_encapsulated_proto; 3711 switch (ethertype) { 3712 case htons(ETH_P_ARP): 3713 case htons(ETH_P_IP): 3714 case htons(ETH_P_IPV6): 3715 break; 3716 default: 3717 return false; 3718 } 3719 3720 return true; 3721 } 3722 3723 static void 3724 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3725 struct sk_buff_head *queue) 3726 { 3727 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3728 struct ieee80211_local *local = sdata->local; 3729 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3730 struct sta_info *sta, *first = NULL; 3731 struct sk_buff *cloned_skb; 3732 3733 rcu_read_lock(); 3734 3735 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3736 if (sdata != sta->sdata) 3737 /* AP-VLAN mismatch */ 3738 continue; 3739 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3740 /* do not send back to source */ 3741 continue; 3742 if (!first) { 3743 first = sta; 3744 continue; 3745 } 3746 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3747 if (!cloned_skb) 3748 goto multicast; 3749 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3750 dev_kfree_skb(cloned_skb); 3751 goto multicast; 3752 } 3753 __skb_queue_tail(queue, cloned_skb); 3754 } 3755 3756 if (likely(first)) { 3757 if (unlikely(ieee80211_change_da(skb, first))) 3758 goto multicast; 3759 __skb_queue_tail(queue, skb); 3760 } else { 3761 /* no STA connected, drop */ 3762 kfree_skb(skb); 3763 skb = NULL; 3764 } 3765 3766 goto out; 3767 multicast: 3768 __skb_queue_purge(queue); 3769 __skb_queue_tail(queue, skb); 3770 out: 3771 rcu_read_unlock(); 3772 } 3773 3774 /** 3775 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 3776 * @skb: packet to be sent 3777 * @dev: incoming interface 3778 * 3779 * On failure skb will be freed. 3780 */ 3781 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 3782 struct net_device *dev) 3783 { 3784 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 3785 struct sk_buff_head queue; 3786 3787 __skb_queue_head_init(&queue); 3788 ieee80211_convert_to_unicast(skb, dev, &queue); 3789 while ((skb = __skb_dequeue(&queue))) 3790 __ieee80211_subif_start_xmit(skb, dev, 0); 3791 } else { 3792 __ieee80211_subif_start_xmit(skb, dev, 0); 3793 } 3794 3795 return NETDEV_TX_OK; 3796 } 3797 3798 struct sk_buff * 3799 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 3800 struct sk_buff *skb, u32 info_flags) 3801 { 3802 struct ieee80211_hdr *hdr; 3803 struct ieee80211_tx_data tx = { 3804 .local = sdata->local, 3805 .sdata = sdata, 3806 }; 3807 struct sta_info *sta; 3808 3809 rcu_read_lock(); 3810 3811 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 3812 kfree_skb(skb); 3813 skb = ERR_PTR(-EINVAL); 3814 goto out; 3815 } 3816 3817 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta); 3818 if (IS_ERR(skb)) 3819 goto out; 3820 3821 hdr = (void *)skb->data; 3822 tx.sta = sta_info_get(sdata, hdr->addr1); 3823 tx.skb = skb; 3824 3825 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 3826 rcu_read_unlock(); 3827 kfree_skb(skb); 3828 return ERR_PTR(-EINVAL); 3829 } 3830 3831 out: 3832 rcu_read_unlock(); 3833 return skb; 3834 } 3835 3836 /* 3837 * ieee80211_clear_tx_pending may not be called in a context where 3838 * it is possible that it packets could come in again. 3839 */ 3840 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 3841 { 3842 struct sk_buff *skb; 3843 int i; 3844 3845 for (i = 0; i < local->hw.queues; i++) { 3846 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 3847 ieee80211_free_txskb(&local->hw, skb); 3848 } 3849 } 3850 3851 /* 3852 * Returns false if the frame couldn't be transmitted but was queued instead, 3853 * which in this case means re-queued -- take as an indication to stop sending 3854 * more pending frames. 3855 */ 3856 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 3857 struct sk_buff *skb) 3858 { 3859 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3860 struct ieee80211_sub_if_data *sdata; 3861 struct sta_info *sta; 3862 struct ieee80211_hdr *hdr; 3863 bool result; 3864 struct ieee80211_chanctx_conf *chanctx_conf; 3865 3866 sdata = vif_to_sdata(info->control.vif); 3867 3868 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 3869 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 3870 if (unlikely(!chanctx_conf)) { 3871 dev_kfree_skb(skb); 3872 return true; 3873 } 3874 info->band = chanctx_conf->def.chan->band; 3875 result = ieee80211_tx(sdata, NULL, skb, true, 0); 3876 } else { 3877 struct sk_buff_head skbs; 3878 3879 __skb_queue_head_init(&skbs); 3880 __skb_queue_tail(&skbs, skb); 3881 3882 hdr = (struct ieee80211_hdr *)skb->data; 3883 sta = sta_info_get(sdata, hdr->addr1); 3884 3885 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 3886 } 3887 3888 return result; 3889 } 3890 3891 /* 3892 * Transmit all pending packets. Called from tasklet. 3893 */ 3894 void ieee80211_tx_pending(unsigned long data) 3895 { 3896 struct ieee80211_local *local = (struct ieee80211_local *)data; 3897 unsigned long flags; 3898 int i; 3899 bool txok; 3900 3901 rcu_read_lock(); 3902 3903 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 3904 for (i = 0; i < local->hw.queues; i++) { 3905 /* 3906 * If queue is stopped by something other than due to pending 3907 * frames, or we have no pending frames, proceed to next queue. 3908 */ 3909 if (local->queue_stop_reasons[i] || 3910 skb_queue_empty(&local->pending[i])) 3911 continue; 3912 3913 while (!skb_queue_empty(&local->pending[i])) { 3914 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 3915 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3916 3917 if (WARN_ON(!info->control.vif)) { 3918 ieee80211_free_txskb(&local->hw, skb); 3919 continue; 3920 } 3921 3922 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 3923 flags); 3924 3925 txok = ieee80211_tx_pending_skb(local, skb); 3926 spin_lock_irqsave(&local->queue_stop_reason_lock, 3927 flags); 3928 if (!txok) 3929 break; 3930 } 3931 3932 if (skb_queue_empty(&local->pending[i])) 3933 ieee80211_propagate_queue_wake(local, i); 3934 } 3935 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 3936 3937 rcu_read_unlock(); 3938 } 3939 3940 /* functions for drivers to get certain frames */ 3941 3942 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 3943 struct ps_data *ps, struct sk_buff *skb, 3944 bool is_template) 3945 { 3946 u8 *pos, *tim; 3947 int aid0 = 0; 3948 int i, have_bits = 0, n1, n2; 3949 3950 /* Generate bitmap for TIM only if there are any STAs in power save 3951 * mode. */ 3952 if (atomic_read(&ps->num_sta_ps) > 0) 3953 /* in the hope that this is faster than 3954 * checking byte-for-byte */ 3955 have_bits = !bitmap_empty((unsigned long *)ps->tim, 3956 IEEE80211_MAX_AID+1); 3957 if (!is_template) { 3958 if (ps->dtim_count == 0) 3959 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 3960 else 3961 ps->dtim_count--; 3962 } 3963 3964 tim = pos = skb_put(skb, 6); 3965 *pos++ = WLAN_EID_TIM; 3966 *pos++ = 4; 3967 *pos++ = ps->dtim_count; 3968 *pos++ = sdata->vif.bss_conf.dtim_period; 3969 3970 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 3971 aid0 = 1; 3972 3973 ps->dtim_bc_mc = aid0 == 1; 3974 3975 if (have_bits) { 3976 /* Find largest even number N1 so that bits numbered 1 through 3977 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 3978 * (N2 + 1) x 8 through 2007 are 0. */ 3979 n1 = 0; 3980 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 3981 if (ps->tim[i]) { 3982 n1 = i & 0xfe; 3983 break; 3984 } 3985 } 3986 n2 = n1; 3987 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 3988 if (ps->tim[i]) { 3989 n2 = i; 3990 break; 3991 } 3992 } 3993 3994 /* Bitmap control */ 3995 *pos++ = n1 | aid0; 3996 /* Part Virt Bitmap */ 3997 skb_put(skb, n2 - n1); 3998 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 3999 4000 tim[1] = n2 - n1 + 4; 4001 } else { 4002 *pos++ = aid0; /* Bitmap control */ 4003 *pos++ = 0; /* Part Virt Bitmap */ 4004 } 4005 } 4006 4007 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4008 struct ps_data *ps, struct sk_buff *skb, 4009 bool is_template) 4010 { 4011 struct ieee80211_local *local = sdata->local; 4012 4013 /* 4014 * Not very nice, but we want to allow the driver to call 4015 * ieee80211_beacon_get() as a response to the set_tim() 4016 * callback. That, however, is already invoked under the 4017 * sta_lock to guarantee consistent and race-free update 4018 * of the tim bitmap in mac80211 and the driver. 4019 */ 4020 if (local->tim_in_locked_section) { 4021 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4022 } else { 4023 spin_lock_bh(&local->tim_lock); 4024 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4025 spin_unlock_bh(&local->tim_lock); 4026 } 4027 4028 return 0; 4029 } 4030 4031 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4032 struct beacon_data *beacon) 4033 { 4034 struct probe_resp *resp; 4035 u8 *beacon_data; 4036 size_t beacon_data_len; 4037 int i; 4038 u8 count = beacon->csa_current_counter; 4039 4040 switch (sdata->vif.type) { 4041 case NL80211_IFTYPE_AP: 4042 beacon_data = beacon->tail; 4043 beacon_data_len = beacon->tail_len; 4044 break; 4045 case NL80211_IFTYPE_ADHOC: 4046 beacon_data = beacon->head; 4047 beacon_data_len = beacon->head_len; 4048 break; 4049 case NL80211_IFTYPE_MESH_POINT: 4050 beacon_data = beacon->head; 4051 beacon_data_len = beacon->head_len; 4052 break; 4053 default: 4054 return; 4055 } 4056 4057 rcu_read_lock(); 4058 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4059 resp = rcu_dereference(sdata->u.ap.probe_resp); 4060 4061 if (beacon->csa_counter_offsets[i]) { 4062 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4063 beacon_data_len)) { 4064 rcu_read_unlock(); 4065 return; 4066 } 4067 4068 beacon_data[beacon->csa_counter_offsets[i]] = count; 4069 } 4070 4071 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4072 resp->data[resp->csa_counter_offsets[i]] = count; 4073 } 4074 rcu_read_unlock(); 4075 } 4076 4077 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4078 { 4079 beacon->csa_current_counter--; 4080 4081 /* the counter should never reach 0 */ 4082 WARN_ON_ONCE(!beacon->csa_current_counter); 4083 4084 return beacon->csa_current_counter; 4085 } 4086 4087 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4088 { 4089 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4090 struct beacon_data *beacon = NULL; 4091 u8 count = 0; 4092 4093 rcu_read_lock(); 4094 4095 if (sdata->vif.type == NL80211_IFTYPE_AP) 4096 beacon = rcu_dereference(sdata->u.ap.beacon); 4097 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4098 beacon = rcu_dereference(sdata->u.ibss.presp); 4099 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4100 beacon = rcu_dereference(sdata->u.mesh.beacon); 4101 4102 if (!beacon) 4103 goto unlock; 4104 4105 count = __ieee80211_csa_update_counter(beacon); 4106 4107 unlock: 4108 rcu_read_unlock(); 4109 return count; 4110 } 4111 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4112 4113 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4114 { 4115 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4116 struct beacon_data *beacon = NULL; 4117 4118 rcu_read_lock(); 4119 4120 if (sdata->vif.type == NL80211_IFTYPE_AP) 4121 beacon = rcu_dereference(sdata->u.ap.beacon); 4122 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4123 beacon = rcu_dereference(sdata->u.ibss.presp); 4124 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4125 beacon = rcu_dereference(sdata->u.mesh.beacon); 4126 4127 if (!beacon) 4128 goto unlock; 4129 4130 if (counter < beacon->csa_current_counter) 4131 beacon->csa_current_counter = counter; 4132 4133 unlock: 4134 rcu_read_unlock(); 4135 } 4136 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4137 4138 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4139 { 4140 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4141 struct beacon_data *beacon = NULL; 4142 u8 *beacon_data; 4143 size_t beacon_data_len; 4144 int ret = false; 4145 4146 if (!ieee80211_sdata_running(sdata)) 4147 return false; 4148 4149 rcu_read_lock(); 4150 if (vif->type == NL80211_IFTYPE_AP) { 4151 struct ieee80211_if_ap *ap = &sdata->u.ap; 4152 4153 beacon = rcu_dereference(ap->beacon); 4154 if (WARN_ON(!beacon || !beacon->tail)) 4155 goto out; 4156 beacon_data = beacon->tail; 4157 beacon_data_len = beacon->tail_len; 4158 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4159 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4160 4161 beacon = rcu_dereference(ifibss->presp); 4162 if (!beacon) 4163 goto out; 4164 4165 beacon_data = beacon->head; 4166 beacon_data_len = beacon->head_len; 4167 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4168 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4169 4170 beacon = rcu_dereference(ifmsh->beacon); 4171 if (!beacon) 4172 goto out; 4173 4174 beacon_data = beacon->head; 4175 beacon_data_len = beacon->head_len; 4176 } else { 4177 WARN_ON(1); 4178 goto out; 4179 } 4180 4181 if (!beacon->csa_counter_offsets[0]) 4182 goto out; 4183 4184 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4185 goto out; 4186 4187 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4188 ret = true; 4189 out: 4190 rcu_read_unlock(); 4191 4192 return ret; 4193 } 4194 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4195 4196 static struct sk_buff * 4197 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4198 struct ieee80211_vif *vif, 4199 struct ieee80211_mutable_offsets *offs, 4200 bool is_template) 4201 { 4202 struct ieee80211_local *local = hw_to_local(hw); 4203 struct beacon_data *beacon = NULL; 4204 struct sk_buff *skb = NULL; 4205 struct ieee80211_tx_info *info; 4206 struct ieee80211_sub_if_data *sdata = NULL; 4207 enum nl80211_band band; 4208 struct ieee80211_tx_rate_control txrc; 4209 struct ieee80211_chanctx_conf *chanctx_conf; 4210 int csa_off_base = 0; 4211 4212 rcu_read_lock(); 4213 4214 sdata = vif_to_sdata(vif); 4215 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4216 4217 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4218 goto out; 4219 4220 if (offs) 4221 memset(offs, 0, sizeof(*offs)); 4222 4223 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4224 struct ieee80211_if_ap *ap = &sdata->u.ap; 4225 4226 beacon = rcu_dereference(ap->beacon); 4227 if (beacon) { 4228 if (beacon->csa_counter_offsets[0]) { 4229 if (!is_template) 4230 __ieee80211_csa_update_counter(beacon); 4231 4232 ieee80211_set_csa(sdata, beacon); 4233 } 4234 4235 /* 4236 * headroom, head length, 4237 * tail length and maximum TIM length 4238 */ 4239 skb = dev_alloc_skb(local->tx_headroom + 4240 beacon->head_len + 4241 beacon->tail_len + 256 + 4242 local->hw.extra_beacon_tailroom); 4243 if (!skb) 4244 goto out; 4245 4246 skb_reserve(skb, local->tx_headroom); 4247 skb_put_data(skb, beacon->head, beacon->head_len); 4248 4249 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4250 is_template); 4251 4252 if (offs) { 4253 offs->tim_offset = beacon->head_len; 4254 offs->tim_length = skb->len - beacon->head_len; 4255 4256 /* for AP the csa offsets are from tail */ 4257 csa_off_base = skb->len; 4258 } 4259 4260 if (beacon->tail) 4261 skb_put_data(skb, beacon->tail, 4262 beacon->tail_len); 4263 } else 4264 goto out; 4265 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4266 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4267 struct ieee80211_hdr *hdr; 4268 4269 beacon = rcu_dereference(ifibss->presp); 4270 if (!beacon) 4271 goto out; 4272 4273 if (beacon->csa_counter_offsets[0]) { 4274 if (!is_template) 4275 __ieee80211_csa_update_counter(beacon); 4276 4277 ieee80211_set_csa(sdata, beacon); 4278 } 4279 4280 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4281 local->hw.extra_beacon_tailroom); 4282 if (!skb) 4283 goto out; 4284 skb_reserve(skb, local->tx_headroom); 4285 skb_put_data(skb, beacon->head, beacon->head_len); 4286 4287 hdr = (struct ieee80211_hdr *) skb->data; 4288 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4289 IEEE80211_STYPE_BEACON); 4290 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4291 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4292 4293 beacon = rcu_dereference(ifmsh->beacon); 4294 if (!beacon) 4295 goto out; 4296 4297 if (beacon->csa_counter_offsets[0]) { 4298 if (!is_template) 4299 /* TODO: For mesh csa_counter is in TU, so 4300 * decrementing it by one isn't correct, but 4301 * for now we leave it consistent with overall 4302 * mac80211's behavior. 4303 */ 4304 __ieee80211_csa_update_counter(beacon); 4305 4306 ieee80211_set_csa(sdata, beacon); 4307 } 4308 4309 if (ifmsh->sync_ops) 4310 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4311 4312 skb = dev_alloc_skb(local->tx_headroom + 4313 beacon->head_len + 4314 256 + /* TIM IE */ 4315 beacon->tail_len + 4316 local->hw.extra_beacon_tailroom); 4317 if (!skb) 4318 goto out; 4319 skb_reserve(skb, local->tx_headroom); 4320 skb_put_data(skb, beacon->head, beacon->head_len); 4321 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4322 4323 if (offs) { 4324 offs->tim_offset = beacon->head_len; 4325 offs->tim_length = skb->len - beacon->head_len; 4326 } 4327 4328 skb_put_data(skb, beacon->tail, beacon->tail_len); 4329 } else { 4330 WARN_ON(1); 4331 goto out; 4332 } 4333 4334 /* CSA offsets */ 4335 if (offs && beacon) { 4336 int i; 4337 4338 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4339 u16 csa_off = beacon->csa_counter_offsets[i]; 4340 4341 if (!csa_off) 4342 continue; 4343 4344 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4345 } 4346 } 4347 4348 band = chanctx_conf->def.chan->band; 4349 4350 info = IEEE80211_SKB_CB(skb); 4351 4352 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4353 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4354 info->band = band; 4355 4356 memset(&txrc, 0, sizeof(txrc)); 4357 txrc.hw = hw; 4358 txrc.sband = local->hw.wiphy->bands[band]; 4359 txrc.bss_conf = &sdata->vif.bss_conf; 4360 txrc.skb = skb; 4361 txrc.reported_rate.idx = -1; 4362 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4363 txrc.bss = true; 4364 rate_control_get_rate(sdata, NULL, &txrc); 4365 4366 info->control.vif = vif; 4367 4368 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4369 IEEE80211_TX_CTL_ASSIGN_SEQ | 4370 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4371 out: 4372 rcu_read_unlock(); 4373 return skb; 4374 4375 } 4376 4377 struct sk_buff * 4378 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4379 struct ieee80211_vif *vif, 4380 struct ieee80211_mutable_offsets *offs) 4381 { 4382 return __ieee80211_beacon_get(hw, vif, offs, true); 4383 } 4384 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4385 4386 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4387 struct ieee80211_vif *vif, 4388 u16 *tim_offset, u16 *tim_length) 4389 { 4390 struct ieee80211_mutable_offsets offs = {}; 4391 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4392 struct sk_buff *copy; 4393 struct ieee80211_supported_band *sband; 4394 int shift; 4395 4396 if (!bcn) 4397 return bcn; 4398 4399 if (tim_offset) 4400 *tim_offset = offs.tim_offset; 4401 4402 if (tim_length) 4403 *tim_length = offs.tim_length; 4404 4405 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4406 !hw_to_local(hw)->monitors) 4407 return bcn; 4408 4409 /* send a copy to monitor interfaces */ 4410 copy = skb_copy(bcn, GFP_ATOMIC); 4411 if (!copy) 4412 return bcn; 4413 4414 shift = ieee80211_vif_get_shift(vif); 4415 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4416 if (!sband) 4417 return bcn; 4418 4419 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false); 4420 4421 return bcn; 4422 } 4423 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4424 4425 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4426 struct ieee80211_vif *vif) 4427 { 4428 struct ieee80211_if_ap *ap = NULL; 4429 struct sk_buff *skb = NULL; 4430 struct probe_resp *presp = NULL; 4431 struct ieee80211_hdr *hdr; 4432 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4433 4434 if (sdata->vif.type != NL80211_IFTYPE_AP) 4435 return NULL; 4436 4437 rcu_read_lock(); 4438 4439 ap = &sdata->u.ap; 4440 presp = rcu_dereference(ap->probe_resp); 4441 if (!presp) 4442 goto out; 4443 4444 skb = dev_alloc_skb(presp->len); 4445 if (!skb) 4446 goto out; 4447 4448 skb_put_data(skb, presp->data, presp->len); 4449 4450 hdr = (struct ieee80211_hdr *) skb->data; 4451 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4452 4453 out: 4454 rcu_read_unlock(); 4455 return skb; 4456 } 4457 EXPORT_SYMBOL(ieee80211_proberesp_get); 4458 4459 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4460 struct ieee80211_vif *vif) 4461 { 4462 struct ieee80211_sub_if_data *sdata; 4463 struct ieee80211_if_managed *ifmgd; 4464 struct ieee80211_pspoll *pspoll; 4465 struct ieee80211_local *local; 4466 struct sk_buff *skb; 4467 4468 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4469 return NULL; 4470 4471 sdata = vif_to_sdata(vif); 4472 ifmgd = &sdata->u.mgd; 4473 local = sdata->local; 4474 4475 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4476 if (!skb) 4477 return NULL; 4478 4479 skb_reserve(skb, local->hw.extra_tx_headroom); 4480 4481 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4482 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4483 IEEE80211_STYPE_PSPOLL); 4484 pspoll->aid = cpu_to_le16(ifmgd->aid); 4485 4486 /* aid in PS-Poll has its two MSBs each set to 1 */ 4487 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4488 4489 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4490 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4491 4492 return skb; 4493 } 4494 EXPORT_SYMBOL(ieee80211_pspoll_get); 4495 4496 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4497 struct ieee80211_vif *vif, 4498 bool qos_ok) 4499 { 4500 struct ieee80211_hdr_3addr *nullfunc; 4501 struct ieee80211_sub_if_data *sdata; 4502 struct ieee80211_if_managed *ifmgd; 4503 struct ieee80211_local *local; 4504 struct sk_buff *skb; 4505 bool qos = false; 4506 4507 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4508 return NULL; 4509 4510 sdata = vif_to_sdata(vif); 4511 ifmgd = &sdata->u.mgd; 4512 local = sdata->local; 4513 4514 if (qos_ok) { 4515 struct sta_info *sta; 4516 4517 rcu_read_lock(); 4518 sta = sta_info_get(sdata, ifmgd->bssid); 4519 qos = sta && sta->sta.wme; 4520 rcu_read_unlock(); 4521 } 4522 4523 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4524 sizeof(*nullfunc) + 2); 4525 if (!skb) 4526 return NULL; 4527 4528 skb_reserve(skb, local->hw.extra_tx_headroom); 4529 4530 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4531 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4532 IEEE80211_STYPE_NULLFUNC | 4533 IEEE80211_FCTL_TODS); 4534 if (qos) { 4535 __le16 qos = cpu_to_le16(7); 4536 4537 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4538 IEEE80211_STYPE_NULLFUNC) != 4539 IEEE80211_STYPE_QOS_NULLFUNC); 4540 nullfunc->frame_control |= 4541 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4542 skb->priority = 7; 4543 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4544 skb_put_data(skb, &qos, sizeof(qos)); 4545 } 4546 4547 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4548 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4549 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4550 4551 return skb; 4552 } 4553 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4554 4555 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4556 const u8 *src_addr, 4557 const u8 *ssid, size_t ssid_len, 4558 size_t tailroom) 4559 { 4560 struct ieee80211_local *local = hw_to_local(hw); 4561 struct ieee80211_hdr_3addr *hdr; 4562 struct sk_buff *skb; 4563 size_t ie_ssid_len; 4564 u8 *pos; 4565 4566 ie_ssid_len = 2 + ssid_len; 4567 4568 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4569 ie_ssid_len + tailroom); 4570 if (!skb) 4571 return NULL; 4572 4573 skb_reserve(skb, local->hw.extra_tx_headroom); 4574 4575 hdr = skb_put_zero(skb, sizeof(*hdr)); 4576 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4577 IEEE80211_STYPE_PROBE_REQ); 4578 eth_broadcast_addr(hdr->addr1); 4579 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4580 eth_broadcast_addr(hdr->addr3); 4581 4582 pos = skb_put(skb, ie_ssid_len); 4583 *pos++ = WLAN_EID_SSID; 4584 *pos++ = ssid_len; 4585 if (ssid_len) 4586 memcpy(pos, ssid, ssid_len); 4587 pos += ssid_len; 4588 4589 return skb; 4590 } 4591 EXPORT_SYMBOL(ieee80211_probereq_get); 4592 4593 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4594 const void *frame, size_t frame_len, 4595 const struct ieee80211_tx_info *frame_txctl, 4596 struct ieee80211_rts *rts) 4597 { 4598 const struct ieee80211_hdr *hdr = frame; 4599 4600 rts->frame_control = 4601 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4602 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4603 frame_txctl); 4604 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4605 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4606 } 4607 EXPORT_SYMBOL(ieee80211_rts_get); 4608 4609 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4610 const void *frame, size_t frame_len, 4611 const struct ieee80211_tx_info *frame_txctl, 4612 struct ieee80211_cts *cts) 4613 { 4614 const struct ieee80211_hdr *hdr = frame; 4615 4616 cts->frame_control = 4617 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4618 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4619 frame_len, frame_txctl); 4620 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4621 } 4622 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4623 4624 struct sk_buff * 4625 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4626 struct ieee80211_vif *vif) 4627 { 4628 struct ieee80211_local *local = hw_to_local(hw); 4629 struct sk_buff *skb = NULL; 4630 struct ieee80211_tx_data tx; 4631 struct ieee80211_sub_if_data *sdata; 4632 struct ps_data *ps; 4633 struct ieee80211_tx_info *info; 4634 struct ieee80211_chanctx_conf *chanctx_conf; 4635 4636 sdata = vif_to_sdata(vif); 4637 4638 rcu_read_lock(); 4639 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4640 4641 if (!chanctx_conf) 4642 goto out; 4643 4644 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4645 struct beacon_data *beacon = 4646 rcu_dereference(sdata->u.ap.beacon); 4647 4648 if (!beacon || !beacon->head) 4649 goto out; 4650 4651 ps = &sdata->u.ap.ps; 4652 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4653 ps = &sdata->u.mesh.ps; 4654 } else { 4655 goto out; 4656 } 4657 4658 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4659 goto out; /* send buffered bc/mc only after DTIM beacon */ 4660 4661 while (1) { 4662 skb = skb_dequeue(&ps->bc_buf); 4663 if (!skb) 4664 goto out; 4665 local->total_ps_buffered--; 4666 4667 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4668 struct ieee80211_hdr *hdr = 4669 (struct ieee80211_hdr *) skb->data; 4670 /* more buffered multicast/broadcast frames ==> set 4671 * MoreData flag in IEEE 802.11 header to inform PS 4672 * STAs */ 4673 hdr->frame_control |= 4674 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4675 } 4676 4677 if (sdata->vif.type == NL80211_IFTYPE_AP) 4678 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4679 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4680 break; 4681 ieee80211_free_txskb(hw, skb); 4682 } 4683 4684 info = IEEE80211_SKB_CB(skb); 4685 4686 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4687 info->band = chanctx_conf->def.chan->band; 4688 4689 if (invoke_tx_handlers(&tx)) 4690 skb = NULL; 4691 out: 4692 rcu_read_unlock(); 4693 4694 return skb; 4695 } 4696 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4697 4698 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4699 { 4700 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4701 struct ieee80211_sub_if_data *sdata = sta->sdata; 4702 struct ieee80211_local *local = sdata->local; 4703 int ret; 4704 u32 queues; 4705 4706 lockdep_assert_held(&local->sta_mtx); 4707 4708 /* only some cases are supported right now */ 4709 switch (sdata->vif.type) { 4710 case NL80211_IFTYPE_STATION: 4711 case NL80211_IFTYPE_AP: 4712 case NL80211_IFTYPE_AP_VLAN: 4713 break; 4714 default: 4715 WARN_ON(1); 4716 return -EINVAL; 4717 } 4718 4719 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4720 return -EINVAL; 4721 4722 if (sta->reserved_tid == tid) { 4723 ret = 0; 4724 goto out; 4725 } 4726 4727 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4728 sdata_err(sdata, "TID reservation already active\n"); 4729 ret = -EALREADY; 4730 goto out; 4731 } 4732 4733 ieee80211_stop_vif_queues(sdata->local, sdata, 4734 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4735 4736 synchronize_net(); 4737 4738 /* Tear down BA sessions so we stop aggregating on this TID */ 4739 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4740 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4741 __ieee80211_stop_tx_ba_session(sta, tid, 4742 AGG_STOP_LOCAL_REQUEST); 4743 } 4744 4745 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4746 __ieee80211_flush_queues(local, sdata, queues, false); 4747 4748 sta->reserved_tid = tid; 4749 4750 ieee80211_wake_vif_queues(local, sdata, 4751 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4752 4753 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4754 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4755 4756 ret = 0; 4757 out: 4758 return ret; 4759 } 4760 EXPORT_SYMBOL(ieee80211_reserve_tid); 4761 4762 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4763 { 4764 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4765 struct ieee80211_sub_if_data *sdata = sta->sdata; 4766 4767 lockdep_assert_held(&sdata->local->sta_mtx); 4768 4769 /* only some cases are supported right now */ 4770 switch (sdata->vif.type) { 4771 case NL80211_IFTYPE_STATION: 4772 case NL80211_IFTYPE_AP: 4773 case NL80211_IFTYPE_AP_VLAN: 4774 break; 4775 default: 4776 WARN_ON(1); 4777 return; 4778 } 4779 4780 if (tid != sta->reserved_tid) { 4781 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 4782 return; 4783 } 4784 4785 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 4786 } 4787 EXPORT_SYMBOL(ieee80211_unreserve_tid); 4788 4789 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 4790 struct sk_buff *skb, int tid, 4791 enum nl80211_band band, u32 txdata_flags) 4792 { 4793 int ac = ieee80211_ac_from_tid(tid); 4794 4795 skb_reset_mac_header(skb); 4796 skb_set_queue_mapping(skb, ac); 4797 skb->priority = tid; 4798 4799 skb->dev = sdata->dev; 4800 4801 /* 4802 * The other path calling ieee80211_xmit is from the tasklet, 4803 * and while we can handle concurrent transmissions locking 4804 * requirements are that we do not come into tx with bhs on. 4805 */ 4806 local_bh_disable(); 4807 IEEE80211_SKB_CB(skb)->band = band; 4808 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 4809 local_bh_enable(); 4810 } 4811 4812 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 4813 const u8 *buf, size_t len, 4814 const u8 *dest, __be16 proto, bool unencrypted) 4815 { 4816 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4817 struct ieee80211_local *local = sdata->local; 4818 struct sk_buff *skb; 4819 struct ethhdr *ehdr; 4820 u32 flags; 4821 4822 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 4823 * or Pre-Authentication 4824 */ 4825 if (proto != sdata->control_port_protocol && 4826 proto != cpu_to_be16(ETH_P_PREAUTH)) 4827 return -EINVAL; 4828 4829 if (unencrypted) 4830 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 4831 else 4832 flags = 0; 4833 4834 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4835 sizeof(struct ethhdr) + len); 4836 if (!skb) 4837 return -ENOMEM; 4838 4839 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 4840 4841 skb_put_data(skb, buf, len); 4842 4843 ehdr = skb_push(skb, sizeof(struct ethhdr)); 4844 memcpy(ehdr->h_dest, dest, ETH_ALEN); 4845 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 4846 ehdr->h_proto = proto; 4847 4848 skb->dev = dev; 4849 skb->protocol = htons(ETH_P_802_3); 4850 skb_reset_network_header(skb); 4851 skb_reset_mac_header(skb); 4852 4853 local_bh_disable(); 4854 __ieee80211_subif_start_xmit(skb, skb->dev, flags); 4855 local_bh_enable(); 4856 4857 return 0; 4858 } 4859