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