1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 42 { 43 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 44 45 u64_stats_update_begin(&tstats->syncp); 46 tstats->tx_packets++; 47 tstats->tx_bytes += len; 48 u64_stats_update_end(&tstats->syncp); 49 } 50 51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 52 struct sk_buff *skb, int group_addr, 53 int next_frag_len) 54 { 55 int rate, mrate, erp, dur, i, shift = 0; 56 struct ieee80211_rate *txrate; 57 struct ieee80211_local *local = tx->local; 58 struct ieee80211_supported_band *sband; 59 struct ieee80211_hdr *hdr; 60 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 61 struct ieee80211_chanctx_conf *chanctx_conf; 62 u32 rate_flags = 0; 63 64 /* assume HW handles this */ 65 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 66 return 0; 67 68 rcu_read_lock(); 69 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 70 if (chanctx_conf) { 71 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 72 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 73 } 74 rcu_read_unlock(); 75 76 /* uh huh? */ 77 if (WARN_ON_ONCE(tx->rate.idx < 0)) 78 return 0; 79 80 sband = local->hw.wiphy->bands[info->band]; 81 txrate = &sband->bitrates[tx->rate.idx]; 82 83 erp = txrate->flags & IEEE80211_RATE_ERP_G; 84 85 /* 86 * data and mgmt (except PS Poll): 87 * - during CFP: 32768 88 * - during contention period: 89 * if addr1 is group address: 0 90 * if more fragments = 0 and addr1 is individual address: time to 91 * transmit one ACK plus SIFS 92 * if more fragments = 1 and addr1 is individual address: time to 93 * transmit next fragment plus 2 x ACK plus 3 x SIFS 94 * 95 * IEEE 802.11, 9.6: 96 * - control response frame (CTS or ACK) shall be transmitted using the 97 * same rate as the immediately previous frame in the frame exchange 98 * sequence, if this rate belongs to the PHY mandatory rates, or else 99 * at the highest possible rate belonging to the PHY rates in the 100 * BSSBasicRateSet 101 */ 102 hdr = (struct ieee80211_hdr *)skb->data; 103 if (ieee80211_is_ctl(hdr->frame_control)) { 104 /* TODO: These control frames are not currently sent by 105 * mac80211, but should they be implemented, this function 106 * needs to be updated to support duration field calculation. 107 * 108 * RTS: time needed to transmit pending data/mgmt frame plus 109 * one CTS frame plus one ACK frame plus 3 x SIFS 110 * CTS: duration of immediately previous RTS minus time 111 * required to transmit CTS and its SIFS 112 * ACK: 0 if immediately previous directed data/mgmt had 113 * more=0, with more=1 duration in ACK frame is duration 114 * from previous frame minus time needed to transmit ACK 115 * and its SIFS 116 * PS Poll: BIT(15) | BIT(14) | aid 117 */ 118 return 0; 119 } 120 121 /* data/mgmt */ 122 if (0 /* FIX: data/mgmt during CFP */) 123 return cpu_to_le16(32768); 124 125 if (group_addr) /* Group address as the destination - no ACK */ 126 return 0; 127 128 /* Individual destination address: 129 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 130 * CTS and ACK frames shall be transmitted using the highest rate in 131 * basic rate set that is less than or equal to the rate of the 132 * immediately previous frame and that is using the same modulation 133 * (CCK or OFDM). If no basic rate set matches with these requirements, 134 * the highest mandatory rate of the PHY that is less than or equal to 135 * the rate of the previous frame is used. 136 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 137 */ 138 rate = -1; 139 /* use lowest available if everything fails */ 140 mrate = sband->bitrates[0].bitrate; 141 for (i = 0; i < sband->n_bitrates; i++) { 142 struct ieee80211_rate *r = &sband->bitrates[i]; 143 144 if (r->bitrate > txrate->bitrate) 145 break; 146 147 if ((rate_flags & r->flags) != rate_flags) 148 continue; 149 150 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 151 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 152 153 switch (sband->band) { 154 case NL80211_BAND_2GHZ: { 155 u32 flag; 156 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 157 flag = IEEE80211_RATE_MANDATORY_G; 158 else 159 flag = IEEE80211_RATE_MANDATORY_B; 160 if (r->flags & flag) 161 mrate = r->bitrate; 162 break; 163 } 164 case NL80211_BAND_5GHZ: 165 case NL80211_BAND_6GHZ: 166 if (r->flags & IEEE80211_RATE_MANDATORY_A) 167 mrate = r->bitrate; 168 break; 169 case NL80211_BAND_60GHZ: 170 /* TODO, for now fall through */ 171 case NUM_NL80211_BANDS: 172 WARN_ON(1); 173 break; 174 } 175 } 176 if (rate == -1) { 177 /* No matching basic rate found; use highest suitable mandatory 178 * PHY rate */ 179 rate = DIV_ROUND_UP(mrate, 1 << shift); 180 } 181 182 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 183 if (ieee80211_is_data_qos(hdr->frame_control) && 184 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 185 dur = 0; 186 else 187 /* Time needed to transmit ACK 188 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 189 * to closest integer */ 190 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 191 tx->sdata->vif.bss_conf.use_short_preamble, 192 shift); 193 194 if (next_frag_len) { 195 /* Frame is fragmented: duration increases with time needed to 196 * transmit next fragment plus ACK and 2 x SIFS. */ 197 dur *= 2; /* ACK + SIFS */ 198 /* next fragment */ 199 dur += ieee80211_frame_duration(sband->band, next_frag_len, 200 txrate->bitrate, erp, 201 tx->sdata->vif.bss_conf.use_short_preamble, 202 shift); 203 } 204 205 return cpu_to_le16(dur); 206 } 207 208 /* tx handlers */ 209 static ieee80211_tx_result debug_noinline 210 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 211 { 212 struct ieee80211_local *local = tx->local; 213 struct ieee80211_if_managed *ifmgd; 214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 215 216 /* driver doesn't support power save */ 217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 218 return TX_CONTINUE; 219 220 /* hardware does dynamic power save */ 221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 222 return TX_CONTINUE; 223 224 /* dynamic power save disabled */ 225 if (local->hw.conf.dynamic_ps_timeout <= 0) 226 return TX_CONTINUE; 227 228 /* we are scanning, don't enable power save */ 229 if (local->scanning) 230 return TX_CONTINUE; 231 232 if (!local->ps_sdata) 233 return TX_CONTINUE; 234 235 /* No point if we're going to suspend */ 236 if (local->quiescing) 237 return TX_CONTINUE; 238 239 /* dynamic ps is supported only in managed mode */ 240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 241 return TX_CONTINUE; 242 243 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 244 return TX_CONTINUE; 245 246 ifmgd = &tx->sdata->u.mgd; 247 248 /* 249 * Don't wakeup from power save if u-apsd is enabled, voip ac has 250 * u-apsd enabled and the frame is in voip class. This effectively 251 * means that even if all access categories have u-apsd enabled, in 252 * practise u-apsd is only used with the voip ac. This is a 253 * workaround for the case when received voip class packets do not 254 * have correct qos tag for some reason, due the network or the 255 * peer application. 256 * 257 * Note: ifmgd->uapsd_queues access is racy here. If the value is 258 * changed via debugfs, user needs to reassociate manually to have 259 * everything in sync. 260 */ 261 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 262 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 263 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 264 return TX_CONTINUE; 265 266 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 267 ieee80211_stop_queues_by_reason(&local->hw, 268 IEEE80211_MAX_QUEUE_MAP, 269 IEEE80211_QUEUE_STOP_REASON_PS, 270 false); 271 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 272 ieee80211_queue_work(&local->hw, 273 &local->dynamic_ps_disable_work); 274 } 275 276 /* Don't restart the timer if we're not disassociated */ 277 if (!ifmgd->associated) 278 return TX_CONTINUE; 279 280 mod_timer(&local->dynamic_ps_timer, jiffies + 281 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 282 283 return TX_CONTINUE; 284 } 285 286 static ieee80211_tx_result debug_noinline 287 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 288 { 289 290 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 291 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 292 bool assoc = false; 293 294 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 295 return TX_CONTINUE; 296 297 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 298 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 299 !ieee80211_is_probe_req(hdr->frame_control) && 300 !ieee80211_is_nullfunc(hdr->frame_control)) 301 /* 302 * When software scanning only nullfunc frames (to notify 303 * the sleep state to the AP) and probe requests (for the 304 * active scan) are allowed, all other frames should not be 305 * sent and we should not get here, but if we do 306 * nonetheless, drop them to avoid sending them 307 * off-channel. See the link below and 308 * ieee80211_start_scan() for more. 309 * 310 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 311 */ 312 return TX_DROP; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 315 return TX_CONTINUE; 316 317 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 318 return TX_CONTINUE; 319 320 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 321 return TX_CONTINUE; 322 323 if (tx->sta) 324 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 325 326 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 327 if (unlikely(!assoc && 328 ieee80211_is_data(hdr->frame_control))) { 329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 330 sdata_info(tx->sdata, 331 "dropped data frame to not associated station %pM\n", 332 hdr->addr1); 333 #endif 334 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 335 return TX_DROP; 336 } 337 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 338 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 339 /* 340 * No associated STAs - no need to send multicast 341 * frames. 342 */ 343 return TX_DROP; 344 } 345 346 return TX_CONTINUE; 347 } 348 349 /* This function is called whenever the AP is about to exceed the maximum limit 350 * of buffered frames for power saving STAs. This situation should not really 351 * happen often during normal operation, so dropping the oldest buffered packet 352 * from each queue should be OK to make some room for new frames. */ 353 static void purge_old_ps_buffers(struct ieee80211_local *local) 354 { 355 int total = 0, purged = 0; 356 struct sk_buff *skb; 357 struct ieee80211_sub_if_data *sdata; 358 struct sta_info *sta; 359 360 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 361 struct ps_data *ps; 362 363 if (sdata->vif.type == NL80211_IFTYPE_AP) 364 ps = &sdata->u.ap.ps; 365 else if (ieee80211_vif_is_mesh(&sdata->vif)) 366 ps = &sdata->u.mesh.ps; 367 else 368 continue; 369 370 skb = skb_dequeue(&ps->bc_buf); 371 if (skb) { 372 purged++; 373 ieee80211_free_txskb(&local->hw, skb); 374 } 375 total += skb_queue_len(&ps->bc_buf); 376 } 377 378 /* 379 * Drop one frame from each station from the lowest-priority 380 * AC that has frames at all. 381 */ 382 list_for_each_entry_rcu(sta, &local->sta_list, list) { 383 int ac; 384 385 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 386 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 387 total += skb_queue_len(&sta->ps_tx_buf[ac]); 388 if (skb) { 389 purged++; 390 ieee80211_free_txskb(&local->hw, skb); 391 break; 392 } 393 } 394 } 395 396 local->total_ps_buffered = total; 397 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 398 } 399 400 static ieee80211_tx_result 401 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 402 { 403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 404 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 405 struct ps_data *ps; 406 407 /* 408 * broadcast/multicast frame 409 * 410 * If any of the associated/peer stations is in power save mode, 411 * the frame is buffered to be sent after DTIM beacon frame. 412 * This is done either by the hardware or us. 413 */ 414 415 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 416 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 417 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 418 if (!tx->sdata->bss) 419 return TX_CONTINUE; 420 421 ps = &tx->sdata->bss->ps; 422 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 423 ps = &tx->sdata->u.mesh.ps; 424 } else { 425 return TX_CONTINUE; 426 } 427 428 429 /* no buffering for ordered frames */ 430 if (ieee80211_has_order(hdr->frame_control)) 431 return TX_CONTINUE; 432 433 if (ieee80211_is_probe_req(hdr->frame_control)) 434 return TX_CONTINUE; 435 436 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 437 info->hw_queue = tx->sdata->vif.cab_queue; 438 439 /* no stations in PS mode and no buffered packets */ 440 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 441 return TX_CONTINUE; 442 443 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 444 445 /* device releases frame after DTIM beacon */ 446 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 447 return TX_CONTINUE; 448 449 /* buffered in mac80211 */ 450 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 451 purge_old_ps_buffers(tx->local); 452 453 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 454 ps_dbg(tx->sdata, 455 "BC TX buffer full - dropping the oldest frame\n"); 456 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 457 } else 458 tx->local->total_ps_buffered++; 459 460 skb_queue_tail(&ps->bc_buf, tx->skb); 461 462 return TX_QUEUED; 463 } 464 465 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 466 struct sk_buff *skb) 467 { 468 if (!ieee80211_is_mgmt(fc)) 469 return 0; 470 471 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 472 return 0; 473 474 if (!ieee80211_is_robust_mgmt_frame(skb)) 475 return 0; 476 477 return 1; 478 } 479 480 static ieee80211_tx_result 481 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 482 { 483 struct sta_info *sta = tx->sta; 484 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 485 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 486 struct ieee80211_local *local = tx->local; 487 488 if (unlikely(!sta)) 489 return TX_CONTINUE; 490 491 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 492 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 493 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 494 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 495 int ac = skb_get_queue_mapping(tx->skb); 496 497 if (ieee80211_is_mgmt(hdr->frame_control) && 498 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 499 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 500 return TX_CONTINUE; 501 } 502 503 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 504 sta->sta.addr, sta->sta.aid, ac); 505 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 506 purge_old_ps_buffers(tx->local); 507 508 /* sync with ieee80211_sta_ps_deliver_wakeup */ 509 spin_lock(&sta->ps_lock); 510 /* 511 * STA woke up the meantime and all the frames on ps_tx_buf have 512 * been queued to pending queue. No reordering can happen, go 513 * ahead and Tx the packet. 514 */ 515 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 516 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 517 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 518 spin_unlock(&sta->ps_lock); 519 return TX_CONTINUE; 520 } 521 522 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 523 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 524 ps_dbg(tx->sdata, 525 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 526 sta->sta.addr, ac); 527 ieee80211_free_txskb(&local->hw, old); 528 } else 529 tx->local->total_ps_buffered++; 530 531 info->control.jiffies = jiffies; 532 info->control.vif = &tx->sdata->vif; 533 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 534 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 535 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 536 spin_unlock(&sta->ps_lock); 537 538 if (!timer_pending(&local->sta_cleanup)) 539 mod_timer(&local->sta_cleanup, 540 round_jiffies(jiffies + 541 STA_INFO_CLEANUP_INTERVAL)); 542 543 /* 544 * We queued up some frames, so the TIM bit might 545 * need to be set, recalculate it. 546 */ 547 sta_info_recalc_tim(sta); 548 549 return TX_QUEUED; 550 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 551 ps_dbg(tx->sdata, 552 "STA %pM in PS mode, but polling/in SP -> send frame\n", 553 sta->sta.addr); 554 } 555 556 return TX_CONTINUE; 557 } 558 559 static ieee80211_tx_result debug_noinline 560 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 561 { 562 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 563 return TX_CONTINUE; 564 565 if (tx->flags & IEEE80211_TX_UNICAST) 566 return ieee80211_tx_h_unicast_ps_buf(tx); 567 else 568 return ieee80211_tx_h_multicast_ps_buf(tx); 569 } 570 571 static ieee80211_tx_result debug_noinline 572 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 573 { 574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 575 576 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 577 if (tx->sdata->control_port_no_encrypt) 578 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 579 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 580 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 581 } 582 583 return TX_CONTINUE; 584 } 585 586 static ieee80211_tx_result debug_noinline 587 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 588 { 589 struct ieee80211_key *key; 590 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 591 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 592 593 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 594 tx->key = NULL; 595 else if (tx->sta && 596 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 597 tx->key = key; 598 else if (ieee80211_is_group_privacy_action(tx->skb) && 599 (key = rcu_dereference(tx->sdata->default_multicast_key))) 600 tx->key = key; 601 else if (ieee80211_is_mgmt(hdr->frame_control) && 602 is_multicast_ether_addr(hdr->addr1) && 603 ieee80211_is_robust_mgmt_frame(tx->skb) && 604 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 605 tx->key = key; 606 else if (is_multicast_ether_addr(hdr->addr1) && 607 (key = rcu_dereference(tx->sdata->default_multicast_key))) 608 tx->key = key; 609 else if (!is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_unicast_key))) 611 tx->key = key; 612 else 613 tx->key = NULL; 614 615 if (tx->key) { 616 bool skip_hw = false; 617 618 /* TODO: add threshold stuff again */ 619 620 switch (tx->key->conf.cipher) { 621 case WLAN_CIPHER_SUITE_WEP40: 622 case WLAN_CIPHER_SUITE_WEP104: 623 case WLAN_CIPHER_SUITE_TKIP: 624 if (!ieee80211_is_data_present(hdr->frame_control)) 625 tx->key = NULL; 626 break; 627 case WLAN_CIPHER_SUITE_CCMP: 628 case WLAN_CIPHER_SUITE_CCMP_256: 629 case WLAN_CIPHER_SUITE_GCMP: 630 case WLAN_CIPHER_SUITE_GCMP_256: 631 if (!ieee80211_is_data_present(hdr->frame_control) && 632 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 633 tx->skb) && 634 !ieee80211_is_group_privacy_action(tx->skb)) 635 tx->key = NULL; 636 else 637 skip_hw = (tx->key->conf.flags & 638 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 639 ieee80211_is_mgmt(hdr->frame_control); 640 break; 641 case WLAN_CIPHER_SUITE_AES_CMAC: 642 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 643 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 644 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 645 if (!ieee80211_is_mgmt(hdr->frame_control)) 646 tx->key = NULL; 647 break; 648 } 649 650 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 651 !ieee80211_is_deauth(hdr->frame_control))) 652 return TX_DROP; 653 654 if (!skip_hw && tx->key && 655 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 656 info->control.hw_key = &tx->key->conf; 657 } 658 659 return TX_CONTINUE; 660 } 661 662 static ieee80211_tx_result debug_noinline 663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 664 { 665 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 666 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 667 struct ieee80211_supported_band *sband; 668 u32 len; 669 struct ieee80211_tx_rate_control txrc; 670 struct ieee80211_sta_rates *ratetbl = NULL; 671 bool assoc = false; 672 673 memset(&txrc, 0, sizeof(txrc)); 674 675 sband = tx->local->hw.wiphy->bands[info->band]; 676 677 len = min_t(u32, tx->skb->len + FCS_LEN, 678 tx->local->hw.wiphy->frag_threshold); 679 680 /* set up the tx rate control struct we give the RC algo */ 681 txrc.hw = &tx->local->hw; 682 txrc.sband = sband; 683 txrc.bss_conf = &tx->sdata->vif.bss_conf; 684 txrc.skb = tx->skb; 685 txrc.reported_rate.idx = -1; 686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 687 688 if (tx->sdata->rc_has_mcs_mask[info->band]) 689 txrc.rate_idx_mcs_mask = 690 tx->sdata->rc_rateidx_mcs_mask[info->band]; 691 692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 695 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 696 697 /* set up RTS protection if desired */ 698 if (len > tx->local->hw.wiphy->rts_threshold) { 699 txrc.rts = true; 700 } 701 702 info->control.use_rts = txrc.rts; 703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 704 705 /* 706 * Use short preamble if the BSS can handle it, but not for 707 * management frames unless we know the receiver can handle 708 * that -- the management frame might be to a station that 709 * just wants a probe response. 710 */ 711 if (tx->sdata->vif.bss_conf.use_short_preamble && 712 (ieee80211_is_data(hdr->frame_control) || 713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 714 txrc.short_preamble = true; 715 716 info->control.short_preamble = txrc.short_preamble; 717 718 /* don't ask rate control when rate already injected via radiotap */ 719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 720 return TX_CONTINUE; 721 722 if (tx->sta) 723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 724 725 /* 726 * Lets not bother rate control if we're associated and cannot 727 * talk to the sta. This should not happen. 728 */ 729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 730 !rate_usable_index_exists(sband, &tx->sta->sta), 731 "%s: Dropped data frame as no usable bitrate found while " 732 "scanning and associated. Target station: " 733 "%pM on %d GHz band\n", 734 tx->sdata->name, hdr->addr1, 735 info->band ? 5 : 2)) 736 return TX_DROP; 737 738 /* 739 * If we're associated with the sta at this point we know we can at 740 * least send the frame at the lowest bit rate. 741 */ 742 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 743 744 if (tx->sta && !info->control.skip_table) 745 ratetbl = rcu_dereference(tx->sta->sta.rates); 746 747 if (unlikely(info->control.rates[0].idx < 0)) { 748 if (ratetbl) { 749 struct ieee80211_tx_rate rate = { 750 .idx = ratetbl->rate[0].idx, 751 .flags = ratetbl->rate[0].flags, 752 .count = ratetbl->rate[0].count 753 }; 754 755 if (ratetbl->rate[0].idx < 0) 756 return TX_DROP; 757 758 tx->rate = rate; 759 } else { 760 return TX_DROP; 761 } 762 } else { 763 tx->rate = info->control.rates[0]; 764 } 765 766 if (txrc.reported_rate.idx < 0) { 767 txrc.reported_rate = tx->rate; 768 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 } else if (tx->sta) 771 tx->sta->tx_stats.last_rate = txrc.reported_rate; 772 773 if (ratetbl) 774 return TX_CONTINUE; 775 776 if (unlikely(!info->control.rates[0].count)) 777 info->control.rates[0].count = 1; 778 779 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 780 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 781 info->control.rates[0].count = 1; 782 783 return TX_CONTINUE; 784 } 785 786 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 787 { 788 u16 *seq = &sta->tid_seq[tid]; 789 __le16 ret = cpu_to_le16(*seq); 790 791 /* Increase the sequence number. */ 792 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 793 794 return ret; 795 } 796 797 static ieee80211_tx_result debug_noinline 798 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 799 { 800 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 801 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 802 int tid; 803 804 /* 805 * Packet injection may want to control the sequence 806 * number, if we have no matching interface then we 807 * neither assign one ourselves nor ask the driver to. 808 */ 809 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 810 return TX_CONTINUE; 811 812 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 813 return TX_CONTINUE; 814 815 if (ieee80211_hdrlen(hdr->frame_control) < 24) 816 return TX_CONTINUE; 817 818 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 819 return TX_CONTINUE; 820 821 /* 822 * Anything but QoS data that has a sequence number field 823 * (is long enough) gets a sequence number from the global 824 * counter. QoS data frames with a multicast destination 825 * also use the global counter (802.11-2012 9.3.2.10). 826 */ 827 if (!ieee80211_is_data_qos(hdr->frame_control) || 828 is_multicast_ether_addr(hdr->addr1)) { 829 if (tx->flags & IEEE80211_TX_NO_SEQNO) 830 return TX_CONTINUE; 831 /* driver should assign sequence number */ 832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 833 /* for pure STA mode without beacons, we can do it */ 834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 835 tx->sdata->sequence_number += 0x10; 836 if (tx->sta) 837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 838 return TX_CONTINUE; 839 } 840 841 /* 842 * This should be true for injected/management frames only, for 843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 844 * above since they are not QoS-data frames. 845 */ 846 if (!tx->sta) 847 return TX_CONTINUE; 848 849 /* include per-STA, per-TID sequence counter */ 850 tid = ieee80211_get_tid(hdr); 851 tx->sta->tx_stats.msdu[tid]++; 852 853 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 854 855 return TX_CONTINUE; 856 } 857 858 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 859 struct sk_buff *skb, int hdrlen, 860 int frag_threshold) 861 { 862 struct ieee80211_local *local = tx->local; 863 struct ieee80211_tx_info *info; 864 struct sk_buff *tmp; 865 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 866 int pos = hdrlen + per_fragm; 867 int rem = skb->len - hdrlen - per_fragm; 868 869 if (WARN_ON(rem < 0)) 870 return -EINVAL; 871 872 /* first fragment was already added to queue by caller */ 873 874 while (rem) { 875 int fraglen = per_fragm; 876 877 if (fraglen > rem) 878 fraglen = rem; 879 rem -= fraglen; 880 tmp = dev_alloc_skb(local->tx_headroom + 881 frag_threshold + 882 tx->sdata->encrypt_headroom + 883 IEEE80211_ENCRYPT_TAILROOM); 884 if (!tmp) 885 return -ENOMEM; 886 887 __skb_queue_tail(&tx->skbs, tmp); 888 889 skb_reserve(tmp, 890 local->tx_headroom + tx->sdata->encrypt_headroom); 891 892 /* copy control information */ 893 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 894 895 info = IEEE80211_SKB_CB(tmp); 896 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 897 IEEE80211_TX_CTL_FIRST_FRAGMENT); 898 899 if (rem) 900 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 901 902 skb_copy_queue_mapping(tmp, skb); 903 tmp->priority = skb->priority; 904 tmp->dev = skb->dev; 905 906 /* copy header and data */ 907 skb_put_data(tmp, skb->data, hdrlen); 908 skb_put_data(tmp, skb->data + pos, fraglen); 909 910 pos += fraglen; 911 } 912 913 /* adjust first fragment's length */ 914 skb_trim(skb, hdrlen + per_fragm); 915 return 0; 916 } 917 918 static ieee80211_tx_result debug_noinline 919 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 920 { 921 struct sk_buff *skb = tx->skb; 922 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 923 struct ieee80211_hdr *hdr = (void *)skb->data; 924 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 925 int hdrlen; 926 int fragnum; 927 928 /* no matter what happens, tx->skb moves to tx->skbs */ 929 __skb_queue_tail(&tx->skbs, skb); 930 tx->skb = NULL; 931 932 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 933 return TX_CONTINUE; 934 935 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 936 return TX_CONTINUE; 937 938 /* 939 * Warn when submitting a fragmented A-MPDU frame and drop it. 940 * This scenario is handled in ieee80211_tx_prepare but extra 941 * caution taken here as fragmented ampdu may cause Tx stop. 942 */ 943 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 944 return TX_DROP; 945 946 hdrlen = ieee80211_hdrlen(hdr->frame_control); 947 948 /* internal error, why isn't DONTFRAG set? */ 949 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 950 return TX_DROP; 951 952 /* 953 * Now fragment the frame. This will allocate all the fragments and 954 * chain them (using skb as the first fragment) to skb->next. 955 * During transmission, we will remove the successfully transmitted 956 * fragments from this list. When the low-level driver rejects one 957 * of the fragments then we will simply pretend to accept the skb 958 * but store it away as pending. 959 */ 960 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 961 return TX_DROP; 962 963 /* update duration/seq/flags of fragments */ 964 fragnum = 0; 965 966 skb_queue_walk(&tx->skbs, skb) { 967 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 968 969 hdr = (void *)skb->data; 970 info = IEEE80211_SKB_CB(skb); 971 972 if (!skb_queue_is_last(&tx->skbs, skb)) { 973 hdr->frame_control |= morefrags; 974 /* 975 * No multi-rate retries for fragmented frames, that 976 * would completely throw off the NAV at other STAs. 977 */ 978 info->control.rates[1].idx = -1; 979 info->control.rates[2].idx = -1; 980 info->control.rates[3].idx = -1; 981 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 982 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 983 } else { 984 hdr->frame_control &= ~morefrags; 985 } 986 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 987 fragnum++; 988 } 989 990 return TX_CONTINUE; 991 } 992 993 static ieee80211_tx_result debug_noinline 994 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 995 { 996 struct sk_buff *skb; 997 int ac = -1; 998 999 if (!tx->sta) 1000 return TX_CONTINUE; 1001 1002 skb_queue_walk(&tx->skbs, skb) { 1003 ac = skb_get_queue_mapping(skb); 1004 tx->sta->tx_stats.bytes[ac] += skb->len; 1005 } 1006 if (ac >= 0) 1007 tx->sta->tx_stats.packets[ac]++; 1008 1009 return TX_CONTINUE; 1010 } 1011 1012 static ieee80211_tx_result debug_noinline 1013 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1014 { 1015 if (!tx->key) 1016 return TX_CONTINUE; 1017 1018 switch (tx->key->conf.cipher) { 1019 case WLAN_CIPHER_SUITE_WEP40: 1020 case WLAN_CIPHER_SUITE_WEP104: 1021 return ieee80211_crypto_wep_encrypt(tx); 1022 case WLAN_CIPHER_SUITE_TKIP: 1023 return ieee80211_crypto_tkip_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_CCMP: 1025 return ieee80211_crypto_ccmp_encrypt( 1026 tx, IEEE80211_CCMP_MIC_LEN); 1027 case WLAN_CIPHER_SUITE_CCMP_256: 1028 return ieee80211_crypto_ccmp_encrypt( 1029 tx, IEEE80211_CCMP_256_MIC_LEN); 1030 case WLAN_CIPHER_SUITE_AES_CMAC: 1031 return ieee80211_crypto_aes_cmac_encrypt(tx); 1032 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1033 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1035 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1036 return ieee80211_crypto_aes_gmac_encrypt(tx); 1037 case WLAN_CIPHER_SUITE_GCMP: 1038 case WLAN_CIPHER_SUITE_GCMP_256: 1039 return ieee80211_crypto_gcmp_encrypt(tx); 1040 default: 1041 return ieee80211_crypto_hw_encrypt(tx); 1042 } 1043 1044 return TX_DROP; 1045 } 1046 1047 static ieee80211_tx_result debug_noinline 1048 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1049 { 1050 struct sk_buff *skb; 1051 struct ieee80211_hdr *hdr; 1052 int next_len; 1053 bool group_addr; 1054 1055 skb_queue_walk(&tx->skbs, skb) { 1056 hdr = (void *) skb->data; 1057 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1058 break; /* must not overwrite AID */ 1059 if (!skb_queue_is_last(&tx->skbs, skb)) { 1060 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1061 next_len = next->len; 1062 } else 1063 next_len = 0; 1064 group_addr = is_multicast_ether_addr(hdr->addr1); 1065 1066 hdr->duration_id = 1067 ieee80211_duration(tx, skb, group_addr, next_len); 1068 } 1069 1070 return TX_CONTINUE; 1071 } 1072 1073 /* actual transmit path */ 1074 1075 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1076 struct sk_buff *skb, 1077 struct ieee80211_tx_info *info, 1078 struct tid_ampdu_tx *tid_tx, 1079 int tid) 1080 { 1081 bool queued = false; 1082 bool reset_agg_timer = false; 1083 struct sk_buff *purge_skb = NULL; 1084 1085 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1086 info->flags |= IEEE80211_TX_CTL_AMPDU; 1087 reset_agg_timer = true; 1088 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1089 /* 1090 * nothing -- this aggregation session is being started 1091 * but that might still fail with the driver 1092 */ 1093 } else if (!tx->sta->sta.txq[tid]) { 1094 spin_lock(&tx->sta->lock); 1095 /* 1096 * Need to re-check now, because we may get here 1097 * 1098 * 1) in the window during which the setup is actually 1099 * already done, but not marked yet because not all 1100 * packets are spliced over to the driver pending 1101 * queue yet -- if this happened we acquire the lock 1102 * either before or after the splice happens, but 1103 * need to recheck which of these cases happened. 1104 * 1105 * 2) during session teardown, if the OPERATIONAL bit 1106 * was cleared due to the teardown but the pointer 1107 * hasn't been assigned NULL yet (or we loaded it 1108 * before it was assigned) -- in this case it may 1109 * now be NULL which means we should just let the 1110 * packet pass through because splicing the frames 1111 * back is already done. 1112 */ 1113 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1114 1115 if (!tid_tx) { 1116 /* do nothing, let packet pass through */ 1117 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1118 info->flags |= IEEE80211_TX_CTL_AMPDU; 1119 reset_agg_timer = true; 1120 } else { 1121 queued = true; 1122 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1123 clear_sta_flag(tx->sta, WLAN_STA_SP); 1124 ps_dbg(tx->sta->sdata, 1125 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1126 tx->sta->sta.addr, tx->sta->sta.aid); 1127 } 1128 info->control.vif = &tx->sdata->vif; 1129 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1130 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1131 __skb_queue_tail(&tid_tx->pending, skb); 1132 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1133 purge_skb = __skb_dequeue(&tid_tx->pending); 1134 } 1135 spin_unlock(&tx->sta->lock); 1136 1137 if (purge_skb) 1138 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1139 } 1140 1141 /* reset session timer */ 1142 if (reset_agg_timer) 1143 tid_tx->last_tx = jiffies; 1144 1145 return queued; 1146 } 1147 1148 /* 1149 * initialises @tx 1150 * pass %NULL for the station if unknown, a valid pointer if known 1151 * or an ERR_PTR() if the station is known not to exist 1152 */ 1153 static ieee80211_tx_result 1154 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1155 struct ieee80211_tx_data *tx, 1156 struct sta_info *sta, struct sk_buff *skb) 1157 { 1158 struct ieee80211_local *local = sdata->local; 1159 struct ieee80211_hdr *hdr; 1160 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1161 int tid; 1162 1163 memset(tx, 0, sizeof(*tx)); 1164 tx->skb = skb; 1165 tx->local = local; 1166 tx->sdata = sdata; 1167 __skb_queue_head_init(&tx->skbs); 1168 1169 /* 1170 * If this flag is set to true anywhere, and we get here, 1171 * we are doing the needed processing, so remove the flag 1172 * now. 1173 */ 1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1175 1176 hdr = (struct ieee80211_hdr *) skb->data; 1177 1178 if (likely(sta)) { 1179 if (!IS_ERR(sta)) 1180 tx->sta = sta; 1181 } else { 1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1183 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1184 if (!tx->sta && sdata->wdev.use_4addr) 1185 return TX_DROP; 1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1187 IEEE80211_TX_CTL_INJECTED) || 1188 tx->sdata->control_port_protocol == tx->skb->protocol) { 1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1190 } 1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1192 tx->sta = sta_info_get(sdata, hdr->addr1); 1193 } 1194 1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1199 struct tid_ampdu_tx *tid_tx; 1200 1201 tid = ieee80211_get_tid(hdr); 1202 1203 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1204 if (tid_tx) { 1205 bool queued; 1206 1207 queued = ieee80211_tx_prep_agg(tx, skb, info, 1208 tid_tx, tid); 1209 1210 if (unlikely(queued)) 1211 return TX_QUEUED; 1212 } 1213 } 1214 1215 if (is_multicast_ether_addr(hdr->addr1)) { 1216 tx->flags &= ~IEEE80211_TX_UNICAST; 1217 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1218 } else 1219 tx->flags |= IEEE80211_TX_UNICAST; 1220 1221 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1222 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1223 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1224 info->flags & IEEE80211_TX_CTL_AMPDU) 1225 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1226 } 1227 1228 if (!tx->sta) 1229 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1230 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1231 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1232 ieee80211_check_fast_xmit(tx->sta); 1233 } 1234 1235 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1236 1237 return TX_CONTINUE; 1238 } 1239 1240 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1241 struct ieee80211_vif *vif, 1242 struct sta_info *sta, 1243 struct sk_buff *skb) 1244 { 1245 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1246 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1247 struct ieee80211_txq *txq = NULL; 1248 1249 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1250 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1251 return NULL; 1252 1253 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1254 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1255 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1256 vif->type == NL80211_IFTYPE_STATION) && 1257 sta && sta->uploaded) { 1258 /* 1259 * This will be NULL if the driver didn't set the 1260 * opt-in hardware flag. 1261 */ 1262 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1263 } 1264 } else if (sta) { 1265 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1266 1267 if (!sta->uploaded) 1268 return NULL; 1269 1270 txq = sta->sta.txq[tid]; 1271 } else if (vif) { 1272 txq = vif->txq; 1273 } 1274 1275 if (!txq) 1276 return NULL; 1277 1278 return to_txq_info(txq); 1279 } 1280 1281 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1282 { 1283 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1284 } 1285 1286 static u32 codel_skb_len_func(const struct sk_buff *skb) 1287 { 1288 return skb->len; 1289 } 1290 1291 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1292 { 1293 const struct ieee80211_tx_info *info; 1294 1295 info = (const struct ieee80211_tx_info *)skb->cb; 1296 return info->control.enqueue_time; 1297 } 1298 1299 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1300 void *ctx) 1301 { 1302 struct ieee80211_local *local; 1303 struct txq_info *txqi; 1304 struct fq *fq; 1305 struct fq_flow *flow; 1306 1307 txqi = ctx; 1308 local = vif_to_sdata(txqi->txq.vif)->local; 1309 fq = &local->fq; 1310 1311 if (cvars == &txqi->def_cvars) 1312 flow = &txqi->def_flow; 1313 else 1314 flow = &fq->flows[cvars - local->cvars]; 1315 1316 return fq_flow_dequeue(fq, flow); 1317 } 1318 1319 static void codel_drop_func(struct sk_buff *skb, 1320 void *ctx) 1321 { 1322 struct ieee80211_local *local; 1323 struct ieee80211_hw *hw; 1324 struct txq_info *txqi; 1325 1326 txqi = ctx; 1327 local = vif_to_sdata(txqi->txq.vif)->local; 1328 hw = &local->hw; 1329 1330 ieee80211_free_txskb(hw, skb); 1331 } 1332 1333 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1334 struct fq_tin *tin, 1335 struct fq_flow *flow) 1336 { 1337 struct ieee80211_local *local; 1338 struct txq_info *txqi; 1339 struct codel_vars *cvars; 1340 struct codel_params *cparams; 1341 struct codel_stats *cstats; 1342 1343 local = container_of(fq, struct ieee80211_local, fq); 1344 txqi = container_of(tin, struct txq_info, tin); 1345 cstats = &txqi->cstats; 1346 1347 if (txqi->txq.sta) { 1348 struct sta_info *sta = container_of(txqi->txq.sta, 1349 struct sta_info, sta); 1350 cparams = &sta->cparams; 1351 } else { 1352 cparams = &local->cparams; 1353 } 1354 1355 if (flow == &txqi->def_flow) 1356 cvars = &txqi->def_cvars; 1357 else 1358 cvars = &local->cvars[flow - fq->flows]; 1359 1360 return codel_dequeue(txqi, 1361 &flow->backlog, 1362 cparams, 1363 cvars, 1364 cstats, 1365 codel_skb_len_func, 1366 codel_skb_time_func, 1367 codel_drop_func, 1368 codel_dequeue_func); 1369 } 1370 1371 static void fq_skb_free_func(struct fq *fq, 1372 struct fq_tin *tin, 1373 struct fq_flow *flow, 1374 struct sk_buff *skb) 1375 { 1376 struct ieee80211_local *local; 1377 1378 local = container_of(fq, struct ieee80211_local, fq); 1379 ieee80211_free_txskb(&local->hw, skb); 1380 } 1381 1382 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1383 struct fq_tin *tin, 1384 int idx, 1385 struct sk_buff *skb) 1386 { 1387 struct txq_info *txqi; 1388 1389 txqi = container_of(tin, struct txq_info, tin); 1390 return &txqi->def_flow; 1391 } 1392 1393 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1394 struct txq_info *txqi, 1395 struct sk_buff *skb) 1396 { 1397 struct fq *fq = &local->fq; 1398 struct fq_tin *tin = &txqi->tin; 1399 u32 flow_idx = fq_flow_idx(fq, skb); 1400 1401 ieee80211_set_skb_enqueue_time(skb); 1402 1403 spin_lock_bh(&fq->lock); 1404 fq_tin_enqueue(fq, tin, flow_idx, skb, 1405 fq_skb_free_func, 1406 fq_flow_get_default_func); 1407 spin_unlock_bh(&fq->lock); 1408 } 1409 1410 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1411 struct fq_flow *flow, struct sk_buff *skb, 1412 void *data) 1413 { 1414 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1415 1416 return info->control.vif == data; 1417 } 1418 1419 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1420 struct ieee80211_sub_if_data *sdata) 1421 { 1422 struct fq *fq = &local->fq; 1423 struct txq_info *txqi; 1424 struct fq_tin *tin; 1425 struct ieee80211_sub_if_data *ap; 1426 1427 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1428 return; 1429 1430 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1431 1432 if (!ap->vif.txq) 1433 return; 1434 1435 txqi = to_txq_info(ap->vif.txq); 1436 tin = &txqi->tin; 1437 1438 spin_lock_bh(&fq->lock); 1439 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1440 fq_skb_free_func); 1441 spin_unlock_bh(&fq->lock); 1442 } 1443 1444 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1445 struct sta_info *sta, 1446 struct txq_info *txqi, int tid) 1447 { 1448 fq_tin_init(&txqi->tin); 1449 fq_flow_init(&txqi->def_flow); 1450 codel_vars_init(&txqi->def_cvars); 1451 codel_stats_init(&txqi->cstats); 1452 __skb_queue_head_init(&txqi->frags); 1453 INIT_LIST_HEAD(&txqi->schedule_order); 1454 1455 txqi->txq.vif = &sdata->vif; 1456 1457 if (!sta) { 1458 sdata->vif.txq = &txqi->txq; 1459 txqi->txq.tid = 0; 1460 txqi->txq.ac = IEEE80211_AC_BE; 1461 1462 return; 1463 } 1464 1465 if (tid == IEEE80211_NUM_TIDS) { 1466 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1467 /* Drivers need to opt in to the management MPDU TXQ */ 1468 if (!ieee80211_hw_check(&sdata->local->hw, 1469 STA_MMPDU_TXQ)) 1470 return; 1471 } else if (!ieee80211_hw_check(&sdata->local->hw, 1472 BUFF_MMPDU_TXQ)) { 1473 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1474 return; 1475 } 1476 txqi->txq.ac = IEEE80211_AC_VO; 1477 } else { 1478 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1479 } 1480 1481 txqi->txq.sta = &sta->sta; 1482 txqi->txq.tid = tid; 1483 sta->sta.txq[tid] = &txqi->txq; 1484 } 1485 1486 void ieee80211_txq_purge(struct ieee80211_local *local, 1487 struct txq_info *txqi) 1488 { 1489 struct fq *fq = &local->fq; 1490 struct fq_tin *tin = &txqi->tin; 1491 1492 spin_lock_bh(&fq->lock); 1493 fq_tin_reset(fq, tin, fq_skb_free_func); 1494 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1495 spin_unlock_bh(&fq->lock); 1496 1497 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1498 list_del_init(&txqi->schedule_order); 1499 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1500 } 1501 1502 void ieee80211_txq_set_params(struct ieee80211_local *local) 1503 { 1504 if (local->hw.wiphy->txq_limit) 1505 local->fq.limit = local->hw.wiphy->txq_limit; 1506 else 1507 local->hw.wiphy->txq_limit = local->fq.limit; 1508 1509 if (local->hw.wiphy->txq_memory_limit) 1510 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1511 else 1512 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1513 1514 if (local->hw.wiphy->txq_quantum) 1515 local->fq.quantum = local->hw.wiphy->txq_quantum; 1516 else 1517 local->hw.wiphy->txq_quantum = local->fq.quantum; 1518 } 1519 1520 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1521 { 1522 struct fq *fq = &local->fq; 1523 int ret; 1524 int i; 1525 bool supp_vht = false; 1526 enum nl80211_band band; 1527 1528 if (!local->ops->wake_tx_queue) 1529 return 0; 1530 1531 ret = fq_init(fq, 4096); 1532 if (ret) 1533 return ret; 1534 1535 /* 1536 * If the hardware doesn't support VHT, it is safe to limit the maximum 1537 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1538 */ 1539 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1540 struct ieee80211_supported_band *sband; 1541 1542 sband = local->hw.wiphy->bands[band]; 1543 if (!sband) 1544 continue; 1545 1546 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1547 } 1548 1549 if (!supp_vht) 1550 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1551 1552 codel_params_init(&local->cparams); 1553 local->cparams.interval = MS2TIME(100); 1554 local->cparams.target = MS2TIME(20); 1555 local->cparams.ecn = true; 1556 1557 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1558 GFP_KERNEL); 1559 if (!local->cvars) { 1560 spin_lock_bh(&fq->lock); 1561 fq_reset(fq, fq_skb_free_func); 1562 spin_unlock_bh(&fq->lock); 1563 return -ENOMEM; 1564 } 1565 1566 for (i = 0; i < fq->flows_cnt; i++) 1567 codel_vars_init(&local->cvars[i]); 1568 1569 ieee80211_txq_set_params(local); 1570 1571 return 0; 1572 } 1573 1574 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1575 { 1576 struct fq *fq = &local->fq; 1577 1578 if (!local->ops->wake_tx_queue) 1579 return; 1580 1581 kfree(local->cvars); 1582 local->cvars = NULL; 1583 1584 spin_lock_bh(&fq->lock); 1585 fq_reset(fq, fq_skb_free_func); 1586 spin_unlock_bh(&fq->lock); 1587 } 1588 1589 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1590 struct ieee80211_sub_if_data *sdata, 1591 struct sta_info *sta, 1592 struct sk_buff *skb) 1593 { 1594 struct ieee80211_vif *vif; 1595 struct txq_info *txqi; 1596 1597 if (!local->ops->wake_tx_queue || 1598 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1599 return false; 1600 1601 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1602 sdata = container_of(sdata->bss, 1603 struct ieee80211_sub_if_data, u.ap); 1604 1605 vif = &sdata->vif; 1606 txqi = ieee80211_get_txq(local, vif, sta, skb); 1607 1608 if (!txqi) 1609 return false; 1610 1611 ieee80211_txq_enqueue(local, txqi, skb); 1612 1613 schedule_and_wake_txq(local, txqi); 1614 1615 return true; 1616 } 1617 1618 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1619 struct ieee80211_vif *vif, 1620 struct ieee80211_sta *sta, 1621 struct sk_buff_head *skbs, 1622 bool txpending) 1623 { 1624 struct ieee80211_tx_control control = {}; 1625 struct sk_buff *skb, *tmp; 1626 unsigned long flags; 1627 1628 skb_queue_walk_safe(skbs, skb, tmp) { 1629 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1630 int q = info->hw_queue; 1631 1632 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1633 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1634 __skb_unlink(skb, skbs); 1635 ieee80211_free_txskb(&local->hw, skb); 1636 continue; 1637 } 1638 #endif 1639 1640 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1641 if (local->queue_stop_reasons[q] || 1642 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1643 if (unlikely(info->flags & 1644 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1645 if (local->queue_stop_reasons[q] & 1646 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1647 /* 1648 * Drop off-channel frames if queues 1649 * are stopped for any reason other 1650 * than off-channel operation. Never 1651 * queue them. 1652 */ 1653 spin_unlock_irqrestore( 1654 &local->queue_stop_reason_lock, 1655 flags); 1656 ieee80211_purge_tx_queue(&local->hw, 1657 skbs); 1658 return true; 1659 } 1660 } else { 1661 1662 /* 1663 * Since queue is stopped, queue up frames for 1664 * later transmission from the tx-pending 1665 * tasklet when the queue is woken again. 1666 */ 1667 if (txpending) 1668 skb_queue_splice_init(skbs, 1669 &local->pending[q]); 1670 else 1671 skb_queue_splice_tail_init(skbs, 1672 &local->pending[q]); 1673 1674 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1675 flags); 1676 return false; 1677 } 1678 } 1679 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1680 1681 info->control.vif = vif; 1682 control.sta = sta; 1683 1684 __skb_unlink(skb, skbs); 1685 drv_tx(local, &control, skb); 1686 } 1687 1688 return true; 1689 } 1690 1691 /* 1692 * Returns false if the frame couldn't be transmitted but was queued instead. 1693 */ 1694 static bool __ieee80211_tx(struct ieee80211_local *local, 1695 struct sk_buff_head *skbs, int led_len, 1696 struct sta_info *sta, bool txpending) 1697 { 1698 struct ieee80211_tx_info *info; 1699 struct ieee80211_sub_if_data *sdata; 1700 struct ieee80211_vif *vif; 1701 struct ieee80211_sta *pubsta; 1702 struct sk_buff *skb; 1703 bool result = true; 1704 __le16 fc; 1705 1706 if (WARN_ON(skb_queue_empty(skbs))) 1707 return true; 1708 1709 skb = skb_peek(skbs); 1710 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1711 info = IEEE80211_SKB_CB(skb); 1712 sdata = vif_to_sdata(info->control.vif); 1713 if (sta && !sta->uploaded) 1714 sta = NULL; 1715 1716 if (sta) 1717 pubsta = &sta->sta; 1718 else 1719 pubsta = NULL; 1720 1721 switch (sdata->vif.type) { 1722 case NL80211_IFTYPE_MONITOR: 1723 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1724 vif = &sdata->vif; 1725 break; 1726 } 1727 sdata = rcu_dereference(local->monitor_sdata); 1728 if (sdata) { 1729 vif = &sdata->vif; 1730 info->hw_queue = 1731 vif->hw_queue[skb_get_queue_mapping(skb)]; 1732 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1733 ieee80211_purge_tx_queue(&local->hw, skbs); 1734 return true; 1735 } else 1736 vif = NULL; 1737 break; 1738 case NL80211_IFTYPE_AP_VLAN: 1739 sdata = container_of(sdata->bss, 1740 struct ieee80211_sub_if_data, u.ap); 1741 /* fall through */ 1742 default: 1743 vif = &sdata->vif; 1744 break; 1745 } 1746 1747 result = ieee80211_tx_frags(local, vif, pubsta, skbs, 1748 txpending); 1749 1750 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1751 1752 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1753 1754 return result; 1755 } 1756 1757 /* 1758 * Invoke TX handlers, return 0 on success and non-zero if the 1759 * frame was dropped or queued. 1760 * 1761 * The handlers are split into an early and late part. The latter is everything 1762 * that can be sensitive to reordering, and will be deferred to after packets 1763 * are dequeued from the intermediate queues (when they are enabled). 1764 */ 1765 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1766 { 1767 ieee80211_tx_result res = TX_DROP; 1768 1769 #define CALL_TXH(txh) \ 1770 do { \ 1771 res = txh(tx); \ 1772 if (res != TX_CONTINUE) \ 1773 goto txh_done; \ 1774 } while (0) 1775 1776 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1777 CALL_TXH(ieee80211_tx_h_check_assoc); 1778 CALL_TXH(ieee80211_tx_h_ps_buf); 1779 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1780 CALL_TXH(ieee80211_tx_h_select_key); 1781 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1782 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1783 1784 txh_done: 1785 if (unlikely(res == TX_DROP)) { 1786 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1787 if (tx->skb) 1788 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1789 else 1790 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1791 return -1; 1792 } else if (unlikely(res == TX_QUEUED)) { 1793 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1794 return -1; 1795 } 1796 1797 return 0; 1798 } 1799 1800 /* 1801 * Late handlers can be called while the sta lock is held. Handlers that can 1802 * cause packets to be generated will cause deadlock! 1803 */ 1804 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1805 { 1806 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1807 ieee80211_tx_result res = TX_CONTINUE; 1808 1809 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1810 __skb_queue_tail(&tx->skbs, tx->skb); 1811 tx->skb = NULL; 1812 goto txh_done; 1813 } 1814 1815 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1816 CALL_TXH(ieee80211_tx_h_sequence); 1817 CALL_TXH(ieee80211_tx_h_fragment); 1818 /* handlers after fragment must be aware of tx info fragmentation! */ 1819 CALL_TXH(ieee80211_tx_h_stats); 1820 CALL_TXH(ieee80211_tx_h_encrypt); 1821 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1822 CALL_TXH(ieee80211_tx_h_calculate_duration); 1823 #undef CALL_TXH 1824 1825 txh_done: 1826 if (unlikely(res == TX_DROP)) { 1827 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1828 if (tx->skb) 1829 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1830 else 1831 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1832 return -1; 1833 } else if (unlikely(res == TX_QUEUED)) { 1834 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1835 return -1; 1836 } 1837 1838 return 0; 1839 } 1840 1841 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1842 { 1843 int r = invoke_tx_handlers_early(tx); 1844 1845 if (r) 1846 return r; 1847 return invoke_tx_handlers_late(tx); 1848 } 1849 1850 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1851 struct ieee80211_vif *vif, struct sk_buff *skb, 1852 int band, struct ieee80211_sta **sta) 1853 { 1854 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1855 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1856 struct ieee80211_tx_data tx; 1857 struct sk_buff *skb2; 1858 1859 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1860 return false; 1861 1862 info->band = band; 1863 info->control.vif = vif; 1864 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1865 1866 if (invoke_tx_handlers(&tx)) 1867 return false; 1868 1869 if (sta) { 1870 if (tx.sta) 1871 *sta = &tx.sta->sta; 1872 else 1873 *sta = NULL; 1874 } 1875 1876 /* this function isn't suitable for fragmented data frames */ 1877 skb2 = __skb_dequeue(&tx.skbs); 1878 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1879 ieee80211_free_txskb(hw, skb2); 1880 ieee80211_purge_tx_queue(hw, &tx.skbs); 1881 return false; 1882 } 1883 1884 return true; 1885 } 1886 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1887 1888 /* 1889 * Returns false if the frame couldn't be transmitted but was queued instead. 1890 */ 1891 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1892 struct sta_info *sta, struct sk_buff *skb, 1893 bool txpending, u32 txdata_flags) 1894 { 1895 struct ieee80211_local *local = sdata->local; 1896 struct ieee80211_tx_data tx; 1897 ieee80211_tx_result res_prepare; 1898 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1899 bool result = true; 1900 int led_len; 1901 1902 if (unlikely(skb->len < 10)) { 1903 dev_kfree_skb(skb); 1904 return true; 1905 } 1906 1907 /* initialises tx */ 1908 led_len = skb->len; 1909 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1910 1911 tx.flags |= txdata_flags; 1912 1913 if (unlikely(res_prepare == TX_DROP)) { 1914 ieee80211_free_txskb(&local->hw, skb); 1915 return true; 1916 } else if (unlikely(res_prepare == TX_QUEUED)) { 1917 return true; 1918 } 1919 1920 /* set up hw_queue value early */ 1921 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1922 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1923 info->hw_queue = 1924 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1925 1926 if (invoke_tx_handlers_early(&tx)) 1927 return true; 1928 1929 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1930 return true; 1931 1932 if (!invoke_tx_handlers_late(&tx)) 1933 result = __ieee80211_tx(local, &tx.skbs, led_len, 1934 tx.sta, txpending); 1935 1936 return result; 1937 } 1938 1939 /* device xmit handlers */ 1940 1941 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1942 struct sk_buff *skb, 1943 int head_need, bool may_encrypt) 1944 { 1945 struct ieee80211_local *local = sdata->local; 1946 struct ieee80211_hdr *hdr; 1947 bool enc_tailroom; 1948 int tail_need = 0; 1949 1950 hdr = (struct ieee80211_hdr *) skb->data; 1951 enc_tailroom = may_encrypt && 1952 (sdata->crypto_tx_tailroom_needed_cnt || 1953 ieee80211_is_mgmt(hdr->frame_control)); 1954 1955 if (enc_tailroom) { 1956 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1957 tail_need -= skb_tailroom(skb); 1958 tail_need = max_t(int, tail_need, 0); 1959 } 1960 1961 if (skb_cloned(skb) && 1962 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1963 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1964 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1965 else if (head_need || tail_need) 1966 I802_DEBUG_INC(local->tx_expand_skb_head); 1967 else 1968 return 0; 1969 1970 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1971 wiphy_debug(local->hw.wiphy, 1972 "failed to reallocate TX buffer\n"); 1973 return -ENOMEM; 1974 } 1975 1976 return 0; 1977 } 1978 1979 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1980 struct sta_info *sta, struct sk_buff *skb, 1981 u32 txdata_flags) 1982 { 1983 struct ieee80211_local *local = sdata->local; 1984 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1985 struct ieee80211_hdr *hdr; 1986 int headroom; 1987 bool may_encrypt; 1988 1989 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1990 1991 headroom = local->tx_headroom; 1992 if (may_encrypt) 1993 headroom += sdata->encrypt_headroom; 1994 headroom -= skb_headroom(skb); 1995 headroom = max_t(int, 0, headroom); 1996 1997 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1998 ieee80211_free_txskb(&local->hw, skb); 1999 return; 2000 } 2001 2002 hdr = (struct ieee80211_hdr *) skb->data; 2003 info->control.vif = &sdata->vif; 2004 2005 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2006 if (ieee80211_is_data(hdr->frame_control) && 2007 is_unicast_ether_addr(hdr->addr1)) { 2008 if (mesh_nexthop_resolve(sdata, skb)) 2009 return; /* skb queued: don't free */ 2010 } else { 2011 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2012 } 2013 } 2014 2015 ieee80211_set_qos_hdr(sdata, skb); 2016 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 2017 } 2018 2019 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 2020 struct sk_buff *skb) 2021 { 2022 struct ieee80211_radiotap_iterator iterator; 2023 struct ieee80211_radiotap_header *rthdr = 2024 (struct ieee80211_radiotap_header *) skb->data; 2025 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2026 struct ieee80211_supported_band *sband = 2027 local->hw.wiphy->bands[info->band]; 2028 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2029 NULL); 2030 u16 txflags; 2031 u16 rate = 0; 2032 bool rate_found = false; 2033 u8 rate_retries = 0; 2034 u16 rate_flags = 0; 2035 u8 mcs_known, mcs_flags, mcs_bw; 2036 u16 vht_known; 2037 u8 vht_mcs = 0, vht_nss = 0; 2038 int i; 2039 2040 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2041 IEEE80211_TX_CTL_DONTFRAG; 2042 2043 /* 2044 * for every radiotap entry that is present 2045 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2046 * entries present, or -EINVAL on error) 2047 */ 2048 2049 while (!ret) { 2050 ret = ieee80211_radiotap_iterator_next(&iterator); 2051 2052 if (ret) 2053 continue; 2054 2055 /* see if this argument is something we can use */ 2056 switch (iterator.this_arg_index) { 2057 /* 2058 * You must take care when dereferencing iterator.this_arg 2059 * for multibyte types... the pointer is not aligned. Use 2060 * get_unaligned((type *)iterator.this_arg) to dereference 2061 * iterator.this_arg for type "type" safely on all arches. 2062 */ 2063 case IEEE80211_RADIOTAP_FLAGS: 2064 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2065 /* 2066 * this indicates that the skb we have been 2067 * handed has the 32-bit FCS CRC at the end... 2068 * we should react to that by snipping it off 2069 * because it will be recomputed and added 2070 * on transmission 2071 */ 2072 if (skb->len < (iterator._max_length + FCS_LEN)) 2073 return false; 2074 2075 skb_trim(skb, skb->len - FCS_LEN); 2076 } 2077 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2078 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2079 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2080 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2081 break; 2082 2083 case IEEE80211_RADIOTAP_TX_FLAGS: 2084 txflags = get_unaligned_le16(iterator.this_arg); 2085 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2086 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2087 break; 2088 2089 case IEEE80211_RADIOTAP_RATE: 2090 rate = *iterator.this_arg; 2091 rate_flags = 0; 2092 rate_found = true; 2093 break; 2094 2095 case IEEE80211_RADIOTAP_DATA_RETRIES: 2096 rate_retries = *iterator.this_arg; 2097 break; 2098 2099 case IEEE80211_RADIOTAP_MCS: 2100 mcs_known = iterator.this_arg[0]; 2101 mcs_flags = iterator.this_arg[1]; 2102 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2103 break; 2104 2105 rate_found = true; 2106 rate = iterator.this_arg[2]; 2107 rate_flags = IEEE80211_TX_RC_MCS; 2108 2109 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2110 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2111 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2112 2113 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2114 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2115 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2116 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2117 break; 2118 2119 case IEEE80211_RADIOTAP_VHT: 2120 vht_known = get_unaligned_le16(iterator.this_arg); 2121 rate_found = true; 2122 2123 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2124 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2125 (iterator.this_arg[2] & 2126 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2127 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2128 if (vht_known & 2129 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2130 if (iterator.this_arg[3] == 1) 2131 rate_flags |= 2132 IEEE80211_TX_RC_40_MHZ_WIDTH; 2133 else if (iterator.this_arg[3] == 4) 2134 rate_flags |= 2135 IEEE80211_TX_RC_80_MHZ_WIDTH; 2136 else if (iterator.this_arg[3] == 11) 2137 rate_flags |= 2138 IEEE80211_TX_RC_160_MHZ_WIDTH; 2139 } 2140 2141 vht_mcs = iterator.this_arg[4] >> 4; 2142 vht_nss = iterator.this_arg[4] & 0xF; 2143 break; 2144 2145 /* 2146 * Please update the file 2147 * Documentation/networking/mac80211-injection.txt 2148 * when parsing new fields here. 2149 */ 2150 2151 default: 2152 break; 2153 } 2154 } 2155 2156 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2157 return false; 2158 2159 if (rate_found) { 2160 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2161 2162 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2163 info->control.rates[i].idx = -1; 2164 info->control.rates[i].flags = 0; 2165 info->control.rates[i].count = 0; 2166 } 2167 2168 if (rate_flags & IEEE80211_TX_RC_MCS) { 2169 info->control.rates[0].idx = rate; 2170 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2171 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2172 vht_nss); 2173 } else { 2174 for (i = 0; i < sband->n_bitrates; i++) { 2175 if (rate * 5 != sband->bitrates[i].bitrate) 2176 continue; 2177 2178 info->control.rates[0].idx = i; 2179 break; 2180 } 2181 } 2182 2183 if (info->control.rates[0].idx < 0) 2184 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2185 2186 info->control.rates[0].flags = rate_flags; 2187 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2188 local->hw.max_rate_tries); 2189 } 2190 2191 /* 2192 * remove the radiotap header 2193 * iterator->_max_length was sanity-checked against 2194 * skb->len by iterator init 2195 */ 2196 skb_pull(skb, iterator._max_length); 2197 2198 return true; 2199 } 2200 2201 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2202 struct net_device *dev) 2203 { 2204 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2205 struct ieee80211_chanctx_conf *chanctx_conf; 2206 struct ieee80211_radiotap_header *prthdr = 2207 (struct ieee80211_radiotap_header *)skb->data; 2208 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2209 struct ieee80211_hdr *hdr; 2210 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2211 struct cfg80211_chan_def *chandef; 2212 u16 len_rthdr; 2213 int hdrlen; 2214 2215 /* check for not even having the fixed radiotap header part */ 2216 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2217 goto fail; /* too short to be possibly valid */ 2218 2219 /* is it a header version we can trust to find length from? */ 2220 if (unlikely(prthdr->it_version)) 2221 goto fail; /* only version 0 is supported */ 2222 2223 /* then there must be a radiotap header with a length we can use */ 2224 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2225 2226 /* does the skb contain enough to deliver on the alleged length? */ 2227 if (unlikely(skb->len < len_rthdr)) 2228 goto fail; /* skb too short for claimed rt header extent */ 2229 2230 /* 2231 * fix up the pointers accounting for the radiotap 2232 * header still being in there. We are being given 2233 * a precooked IEEE80211 header so no need for 2234 * normal processing 2235 */ 2236 skb_set_mac_header(skb, len_rthdr); 2237 /* 2238 * these are just fixed to the end of the rt area since we 2239 * don't have any better information and at this point, nobody cares 2240 */ 2241 skb_set_network_header(skb, len_rthdr); 2242 skb_set_transport_header(skb, len_rthdr); 2243 2244 if (skb->len < len_rthdr + 2) 2245 goto fail; 2246 2247 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2248 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2249 2250 if (skb->len < len_rthdr + hdrlen) 2251 goto fail; 2252 2253 /* 2254 * Initialize skb->protocol if the injected frame is a data frame 2255 * carrying a rfc1042 header 2256 */ 2257 if (ieee80211_is_data(hdr->frame_control) && 2258 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2259 u8 *payload = (u8 *)hdr + hdrlen; 2260 2261 if (ether_addr_equal(payload, rfc1042_header)) 2262 skb->protocol = cpu_to_be16((payload[6] << 8) | 2263 payload[7]); 2264 } 2265 2266 memset(info, 0, sizeof(*info)); 2267 2268 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2269 IEEE80211_TX_CTL_INJECTED; 2270 2271 rcu_read_lock(); 2272 2273 /* 2274 * We process outgoing injected frames that have a local address 2275 * we handle as though they are non-injected frames. 2276 * This code here isn't entirely correct, the local MAC address 2277 * isn't always enough to find the interface to use; for proper 2278 * VLAN/WDS support we will need a different mechanism (which 2279 * likely isn't going to be monitor interfaces). 2280 */ 2281 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2282 2283 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2284 if (!ieee80211_sdata_running(tmp_sdata)) 2285 continue; 2286 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2287 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2288 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2289 continue; 2290 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2291 sdata = tmp_sdata; 2292 break; 2293 } 2294 } 2295 2296 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2297 if (!chanctx_conf) { 2298 tmp_sdata = rcu_dereference(local->monitor_sdata); 2299 if (tmp_sdata) 2300 chanctx_conf = 2301 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2302 } 2303 2304 if (chanctx_conf) 2305 chandef = &chanctx_conf->def; 2306 else if (!local->use_chanctx) 2307 chandef = &local->_oper_chandef; 2308 else 2309 goto fail_rcu; 2310 2311 /* 2312 * Frame injection is not allowed if beaconing is not allowed 2313 * or if we need radar detection. Beaconing is usually not allowed when 2314 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2315 * Passive scan is also used in world regulatory domains where 2316 * your country is not known and as such it should be treated as 2317 * NO TX unless the channel is explicitly allowed in which case 2318 * your current regulatory domain would not have the passive scan 2319 * flag. 2320 * 2321 * Since AP mode uses monitor interfaces to inject/TX management 2322 * frames we can make AP mode the exception to this rule once it 2323 * supports radar detection as its implementation can deal with 2324 * radar detection by itself. We can do that later by adding a 2325 * monitor flag interfaces used for AP support. 2326 */ 2327 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2328 sdata->vif.type)) 2329 goto fail_rcu; 2330 2331 info->band = chandef->chan->band; 2332 2333 /* process and remove the injection radiotap header */ 2334 if (!ieee80211_parse_tx_radiotap(local, skb)) 2335 goto fail_rcu; 2336 2337 ieee80211_xmit(sdata, NULL, skb, 0); 2338 rcu_read_unlock(); 2339 2340 return NETDEV_TX_OK; 2341 2342 fail_rcu: 2343 rcu_read_unlock(); 2344 fail: 2345 dev_kfree_skb(skb); 2346 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2347 } 2348 2349 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2350 { 2351 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2352 2353 return ethertype == ETH_P_TDLS && 2354 skb->len > 14 && 2355 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2356 } 2357 2358 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2359 struct sk_buff *skb, 2360 struct sta_info **sta_out) 2361 { 2362 struct sta_info *sta; 2363 2364 switch (sdata->vif.type) { 2365 case NL80211_IFTYPE_AP_VLAN: 2366 sta = rcu_dereference(sdata->u.vlan.sta); 2367 if (sta) { 2368 *sta_out = sta; 2369 return 0; 2370 } else if (sdata->wdev.use_4addr) { 2371 return -ENOLINK; 2372 } 2373 /* fall through */ 2374 case NL80211_IFTYPE_AP: 2375 case NL80211_IFTYPE_OCB: 2376 case NL80211_IFTYPE_ADHOC: 2377 if (is_multicast_ether_addr(skb->data)) { 2378 *sta_out = ERR_PTR(-ENOENT); 2379 return 0; 2380 } 2381 sta = sta_info_get_bss(sdata, skb->data); 2382 break; 2383 case NL80211_IFTYPE_WDS: 2384 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2385 break; 2386 #ifdef CONFIG_MAC80211_MESH 2387 case NL80211_IFTYPE_MESH_POINT: 2388 /* determined much later */ 2389 *sta_out = NULL; 2390 return 0; 2391 #endif 2392 case NL80211_IFTYPE_STATION: 2393 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2394 sta = sta_info_get(sdata, skb->data); 2395 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2396 if (test_sta_flag(sta, 2397 WLAN_STA_TDLS_PEER_AUTH)) { 2398 *sta_out = sta; 2399 return 0; 2400 } 2401 2402 /* 2403 * TDLS link during setup - throw out frames to 2404 * peer. Allow TDLS-setup frames to unauthorized 2405 * peers for the special case of a link teardown 2406 * after a TDLS sta is removed due to being 2407 * unreachable. 2408 */ 2409 if (!ieee80211_is_tdls_setup(skb)) 2410 return -EINVAL; 2411 } 2412 2413 } 2414 2415 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2416 if (!sta) 2417 return -ENOLINK; 2418 break; 2419 default: 2420 return -EINVAL; 2421 } 2422 2423 *sta_out = sta ?: ERR_PTR(-ENOENT); 2424 return 0; 2425 } 2426 2427 /** 2428 * ieee80211_build_hdr - build 802.11 header in the given frame 2429 * @sdata: virtual interface to build the header for 2430 * @skb: the skb to build the header in 2431 * @info_flags: skb flags to set 2432 * @ctrl_flags: info control flags to set 2433 * 2434 * This function takes the skb with 802.3 header and reformats the header to 2435 * the appropriate IEEE 802.11 header based on which interface the packet is 2436 * being transmitted on. 2437 * 2438 * Note that this function also takes care of the TX status request and 2439 * potential unsharing of the SKB - this needs to be interleaved with the 2440 * header building. 2441 * 2442 * The function requires the read-side RCU lock held 2443 * 2444 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2445 */ 2446 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2447 struct sk_buff *skb, u32 info_flags, 2448 struct sta_info *sta, u32 ctrl_flags) 2449 { 2450 struct ieee80211_local *local = sdata->local; 2451 struct ieee80211_tx_info *info; 2452 int head_need; 2453 u16 ethertype, hdrlen, meshhdrlen = 0; 2454 __le16 fc; 2455 struct ieee80211_hdr hdr; 2456 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2457 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2458 const u8 *encaps_data; 2459 int encaps_len, skip_header_bytes; 2460 bool wme_sta = false, authorized = false; 2461 bool tdls_peer; 2462 bool multicast; 2463 u16 info_id = 0; 2464 struct ieee80211_chanctx_conf *chanctx_conf; 2465 struct ieee80211_sub_if_data *ap_sdata; 2466 enum nl80211_band band; 2467 int ret; 2468 2469 if (IS_ERR(sta)) 2470 sta = NULL; 2471 2472 #ifdef CONFIG_MAC80211_DEBUGFS 2473 if (local->force_tx_status) 2474 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2475 #endif 2476 2477 /* convert Ethernet header to proper 802.11 header (based on 2478 * operation mode) */ 2479 ethertype = (skb->data[12] << 8) | skb->data[13]; 2480 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2481 2482 switch (sdata->vif.type) { 2483 case NL80211_IFTYPE_AP_VLAN: 2484 if (sdata->wdev.use_4addr) { 2485 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2486 /* RA TA DA SA */ 2487 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2488 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2489 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2490 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2491 hdrlen = 30; 2492 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2493 wme_sta = sta->sta.wme; 2494 } 2495 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2496 u.ap); 2497 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2498 if (!chanctx_conf) { 2499 ret = -ENOTCONN; 2500 goto free; 2501 } 2502 band = chanctx_conf->def.chan->band; 2503 if (sdata->wdev.use_4addr) 2504 break; 2505 /* fall through */ 2506 case NL80211_IFTYPE_AP: 2507 if (sdata->vif.type == NL80211_IFTYPE_AP) 2508 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2509 if (!chanctx_conf) { 2510 ret = -ENOTCONN; 2511 goto free; 2512 } 2513 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2514 /* DA BSSID SA */ 2515 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2516 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2517 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2518 hdrlen = 24; 2519 band = chanctx_conf->def.chan->band; 2520 break; 2521 case NL80211_IFTYPE_WDS: 2522 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2523 /* RA TA DA SA */ 2524 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2525 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2526 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2527 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2528 hdrlen = 30; 2529 /* 2530 * This is the exception! WDS style interfaces are prohibited 2531 * when channel contexts are in used so this must be valid 2532 */ 2533 band = local->hw.conf.chandef.chan->band; 2534 break; 2535 #ifdef CONFIG_MAC80211_MESH 2536 case NL80211_IFTYPE_MESH_POINT: 2537 if (!is_multicast_ether_addr(skb->data)) { 2538 struct sta_info *next_hop; 2539 bool mpp_lookup = true; 2540 2541 mpath = mesh_path_lookup(sdata, skb->data); 2542 if (mpath) { 2543 mpp_lookup = false; 2544 next_hop = rcu_dereference(mpath->next_hop); 2545 if (!next_hop || 2546 !(mpath->flags & (MESH_PATH_ACTIVE | 2547 MESH_PATH_RESOLVING))) 2548 mpp_lookup = true; 2549 } 2550 2551 if (mpp_lookup) { 2552 mppath = mpp_path_lookup(sdata, skb->data); 2553 if (mppath) 2554 mppath->exp_time = jiffies; 2555 } 2556 2557 if (mppath && mpath) 2558 mesh_path_del(sdata, mpath->dst); 2559 } 2560 2561 /* 2562 * Use address extension if it is a packet from 2563 * another interface or if we know the destination 2564 * is being proxied by a portal (i.e. portal address 2565 * differs from proxied address) 2566 */ 2567 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2568 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2569 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2570 skb->data, skb->data + ETH_ALEN); 2571 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2572 NULL, NULL); 2573 } else { 2574 /* DS -> MBSS (802.11-2012 13.11.3.3). 2575 * For unicast with unknown forwarding information, 2576 * destination might be in the MBSS or if that fails 2577 * forwarded to another mesh gate. In either case 2578 * resolution will be handled in ieee80211_xmit(), so 2579 * leave the original DA. This also works for mcast */ 2580 const u8 *mesh_da = skb->data; 2581 2582 if (mppath) 2583 mesh_da = mppath->mpp; 2584 else if (mpath) 2585 mesh_da = mpath->dst; 2586 2587 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2588 mesh_da, sdata->vif.addr); 2589 if (is_multicast_ether_addr(mesh_da)) 2590 /* DA TA mSA AE:SA */ 2591 meshhdrlen = ieee80211_new_mesh_header( 2592 sdata, &mesh_hdr, 2593 skb->data + ETH_ALEN, NULL); 2594 else 2595 /* RA TA mDA mSA AE:DA SA */ 2596 meshhdrlen = ieee80211_new_mesh_header( 2597 sdata, &mesh_hdr, skb->data, 2598 skb->data + ETH_ALEN); 2599 2600 } 2601 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2602 if (!chanctx_conf) { 2603 ret = -ENOTCONN; 2604 goto free; 2605 } 2606 band = chanctx_conf->def.chan->band; 2607 2608 /* For injected frames, fill RA right away as nexthop lookup 2609 * will be skipped. 2610 */ 2611 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2612 is_zero_ether_addr(hdr.addr1)) 2613 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2614 break; 2615 #endif 2616 case NL80211_IFTYPE_STATION: 2617 /* we already did checks when looking up the RA STA */ 2618 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2619 2620 if (tdls_peer) { 2621 /* DA SA BSSID */ 2622 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2623 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2624 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2625 hdrlen = 24; 2626 } else if (sdata->u.mgd.use_4addr && 2627 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2628 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2629 IEEE80211_FCTL_TODS); 2630 /* RA TA DA SA */ 2631 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2632 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2633 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2634 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2635 hdrlen = 30; 2636 } else { 2637 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2638 /* BSSID SA DA */ 2639 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2640 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2641 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2642 hdrlen = 24; 2643 } 2644 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2645 if (!chanctx_conf) { 2646 ret = -ENOTCONN; 2647 goto free; 2648 } 2649 band = chanctx_conf->def.chan->band; 2650 break; 2651 case NL80211_IFTYPE_OCB: 2652 /* DA SA BSSID */ 2653 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2654 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2655 eth_broadcast_addr(hdr.addr3); 2656 hdrlen = 24; 2657 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2658 if (!chanctx_conf) { 2659 ret = -ENOTCONN; 2660 goto free; 2661 } 2662 band = chanctx_conf->def.chan->band; 2663 break; 2664 case NL80211_IFTYPE_ADHOC: 2665 /* DA SA BSSID */ 2666 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2667 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2668 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2669 hdrlen = 24; 2670 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2671 if (!chanctx_conf) { 2672 ret = -ENOTCONN; 2673 goto free; 2674 } 2675 band = chanctx_conf->def.chan->band; 2676 break; 2677 default: 2678 ret = -EINVAL; 2679 goto free; 2680 } 2681 2682 multicast = is_multicast_ether_addr(hdr.addr1); 2683 2684 /* sta is always NULL for mesh */ 2685 if (sta) { 2686 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2687 wme_sta = sta->sta.wme; 2688 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2689 /* For mesh, the use of the QoS header is mandatory */ 2690 wme_sta = true; 2691 } 2692 2693 /* receiver does QoS (which also means we do) use it */ 2694 if (wme_sta) { 2695 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2696 hdrlen += 2; 2697 } 2698 2699 /* 2700 * Drop unicast frames to unauthorised stations unless they are 2701 * EAPOL frames from the local station. 2702 */ 2703 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2704 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2705 !multicast && !authorized && 2706 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2707 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2708 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2709 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2710 sdata->name, hdr.addr1); 2711 #endif 2712 2713 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2714 2715 ret = -EPERM; 2716 goto free; 2717 } 2718 2719 if (unlikely(!multicast && skb->sk && 2720 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { 2721 struct sk_buff *ack_skb = skb_clone_sk(skb); 2722 2723 if (ack_skb) { 2724 unsigned long flags; 2725 int id; 2726 2727 spin_lock_irqsave(&local->ack_status_lock, flags); 2728 id = idr_alloc(&local->ack_status_frames, ack_skb, 2729 1, 0x10000, GFP_ATOMIC); 2730 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2731 2732 if (id >= 0) { 2733 info_id = id; 2734 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2735 } else { 2736 kfree_skb(ack_skb); 2737 } 2738 } 2739 } 2740 2741 /* 2742 * If the skb is shared we need to obtain our own copy. 2743 */ 2744 if (skb_shared(skb)) { 2745 struct sk_buff *tmp_skb = skb; 2746 2747 /* can't happen -- skb is a clone if info_id != 0 */ 2748 WARN_ON(info_id); 2749 2750 skb = skb_clone(skb, GFP_ATOMIC); 2751 kfree_skb(tmp_skb); 2752 2753 if (!skb) { 2754 ret = -ENOMEM; 2755 goto free; 2756 } 2757 } 2758 2759 hdr.frame_control = fc; 2760 hdr.duration_id = 0; 2761 hdr.seq_ctrl = 0; 2762 2763 skip_header_bytes = ETH_HLEN; 2764 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2765 encaps_data = bridge_tunnel_header; 2766 encaps_len = sizeof(bridge_tunnel_header); 2767 skip_header_bytes -= 2; 2768 } else if (ethertype >= ETH_P_802_3_MIN) { 2769 encaps_data = rfc1042_header; 2770 encaps_len = sizeof(rfc1042_header); 2771 skip_header_bytes -= 2; 2772 } else { 2773 encaps_data = NULL; 2774 encaps_len = 0; 2775 } 2776 2777 skb_pull(skb, skip_header_bytes); 2778 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2779 2780 /* 2781 * So we need to modify the skb header and hence need a copy of 2782 * that. The head_need variable above doesn't, so far, include 2783 * the needed header space that we don't need right away. If we 2784 * can, then we don't reallocate right now but only after the 2785 * frame arrives at the master device (if it does...) 2786 * 2787 * If we cannot, however, then we will reallocate to include all 2788 * the ever needed space. Also, if we need to reallocate it anyway, 2789 * make it big enough for everything we may ever need. 2790 */ 2791 2792 if (head_need > 0 || skb_cloned(skb)) { 2793 head_need += sdata->encrypt_headroom; 2794 head_need += local->tx_headroom; 2795 head_need = max_t(int, 0, head_need); 2796 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2797 ieee80211_free_txskb(&local->hw, skb); 2798 skb = NULL; 2799 return ERR_PTR(-ENOMEM); 2800 } 2801 } 2802 2803 if (encaps_data) 2804 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2805 2806 #ifdef CONFIG_MAC80211_MESH 2807 if (meshhdrlen > 0) 2808 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2809 #endif 2810 2811 if (ieee80211_is_data_qos(fc)) { 2812 __le16 *qos_control; 2813 2814 qos_control = skb_push(skb, 2); 2815 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2816 /* 2817 * Maybe we could actually set some fields here, for now just 2818 * initialise to zero to indicate no special operation. 2819 */ 2820 *qos_control = 0; 2821 } else 2822 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2823 2824 skb_reset_mac_header(skb); 2825 2826 info = IEEE80211_SKB_CB(skb); 2827 memset(info, 0, sizeof(*info)); 2828 2829 info->flags = info_flags; 2830 info->ack_frame_id = info_id; 2831 info->band = band; 2832 info->control.flags = ctrl_flags; 2833 2834 return skb; 2835 free: 2836 kfree_skb(skb); 2837 return ERR_PTR(ret); 2838 } 2839 2840 /* 2841 * fast-xmit overview 2842 * 2843 * The core idea of this fast-xmit is to remove per-packet checks by checking 2844 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2845 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2846 * much less work can be done per packet. For example, fragmentation must be 2847 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2848 * in the code here. 2849 * 2850 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2851 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2852 * 2853 * The most difficult part of this is that when any of these assumptions 2854 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2855 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2856 * since the per-packet code no longer checks the conditions. This is reflected 2857 * by the calls to these functions throughout the rest of the code, and must be 2858 * maintained if any of the TX path checks change. 2859 */ 2860 2861 void ieee80211_check_fast_xmit(struct sta_info *sta) 2862 { 2863 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2864 struct ieee80211_local *local = sta->local; 2865 struct ieee80211_sub_if_data *sdata = sta->sdata; 2866 struct ieee80211_hdr *hdr = (void *)build.hdr; 2867 struct ieee80211_chanctx_conf *chanctx_conf; 2868 __le16 fc; 2869 2870 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2871 return; 2872 2873 /* Locking here protects both the pointer itself, and against concurrent 2874 * invocations winning data access races to, e.g., the key pointer that 2875 * is used. 2876 * Without it, the invocation of this function right after the key 2877 * pointer changes wouldn't be sufficient, as another CPU could access 2878 * the pointer, then stall, and then do the cache update after the CPU 2879 * that invalidated the key. 2880 * With the locking, such scenarios cannot happen as the check for the 2881 * key and the fast-tx assignment are done atomically, so the CPU that 2882 * modifies the key will either wait or other one will see the key 2883 * cleared/changed already. 2884 */ 2885 spin_lock_bh(&sta->lock); 2886 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2887 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2888 sdata->vif.type == NL80211_IFTYPE_STATION) 2889 goto out; 2890 2891 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2892 goto out; 2893 2894 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2895 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2896 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2897 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2898 goto out; 2899 2900 if (sdata->noack_map) 2901 goto out; 2902 2903 /* fast-xmit doesn't handle fragmentation at all */ 2904 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2905 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2906 goto out; 2907 2908 rcu_read_lock(); 2909 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2910 if (!chanctx_conf) { 2911 rcu_read_unlock(); 2912 goto out; 2913 } 2914 build.band = chanctx_conf->def.chan->band; 2915 rcu_read_unlock(); 2916 2917 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2918 2919 switch (sdata->vif.type) { 2920 case NL80211_IFTYPE_ADHOC: 2921 /* DA SA BSSID */ 2922 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2923 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2924 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2925 build.hdr_len = 24; 2926 break; 2927 case NL80211_IFTYPE_STATION: 2928 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2929 /* DA SA BSSID */ 2930 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2931 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2932 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2933 build.hdr_len = 24; 2934 break; 2935 } 2936 2937 if (sdata->u.mgd.use_4addr) { 2938 /* non-regular ethertype cannot use the fastpath */ 2939 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2940 IEEE80211_FCTL_TODS); 2941 /* RA TA DA SA */ 2942 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2943 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2944 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2945 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2946 build.hdr_len = 30; 2947 break; 2948 } 2949 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2950 /* BSSID SA DA */ 2951 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2952 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2953 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2954 build.hdr_len = 24; 2955 break; 2956 case NL80211_IFTYPE_AP_VLAN: 2957 if (sdata->wdev.use_4addr) { 2958 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2959 IEEE80211_FCTL_TODS); 2960 /* RA TA DA SA */ 2961 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2962 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2963 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2964 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2965 build.hdr_len = 30; 2966 break; 2967 } 2968 /* fall through */ 2969 case NL80211_IFTYPE_AP: 2970 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2971 /* DA BSSID SA */ 2972 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2973 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2974 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2975 build.hdr_len = 24; 2976 break; 2977 default: 2978 /* not handled on fast-xmit */ 2979 goto out; 2980 } 2981 2982 if (sta->sta.wme) { 2983 build.hdr_len += 2; 2984 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2985 } 2986 2987 /* We store the key here so there's no point in using rcu_dereference() 2988 * but that's fine because the code that changes the pointers will call 2989 * this function after doing so. For a single CPU that would be enough, 2990 * for multiple see the comment above. 2991 */ 2992 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2993 if (!build.key) 2994 build.key = rcu_access_pointer(sdata->default_unicast_key); 2995 if (build.key) { 2996 bool gen_iv, iv_spc, mmic; 2997 2998 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 2999 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3000 mmic = build.key->conf.flags & 3001 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3002 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3003 3004 /* don't handle software crypto */ 3005 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3006 goto out; 3007 3008 /* Key is being removed */ 3009 if (build.key->flags & KEY_FLAG_TAINTED) 3010 goto out; 3011 3012 switch (build.key->conf.cipher) { 3013 case WLAN_CIPHER_SUITE_CCMP: 3014 case WLAN_CIPHER_SUITE_CCMP_256: 3015 if (gen_iv) 3016 build.pn_offs = build.hdr_len; 3017 if (gen_iv || iv_spc) 3018 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3019 break; 3020 case WLAN_CIPHER_SUITE_GCMP: 3021 case WLAN_CIPHER_SUITE_GCMP_256: 3022 if (gen_iv) 3023 build.pn_offs = build.hdr_len; 3024 if (gen_iv || iv_spc) 3025 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3026 break; 3027 case WLAN_CIPHER_SUITE_TKIP: 3028 /* cannot handle MMIC or IV generation in xmit-fast */ 3029 if (mmic || gen_iv) 3030 goto out; 3031 if (iv_spc) 3032 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3033 break; 3034 case WLAN_CIPHER_SUITE_WEP40: 3035 case WLAN_CIPHER_SUITE_WEP104: 3036 /* cannot handle IV generation in fast-xmit */ 3037 if (gen_iv) 3038 goto out; 3039 if (iv_spc) 3040 build.hdr_len += IEEE80211_WEP_IV_LEN; 3041 break; 3042 case WLAN_CIPHER_SUITE_AES_CMAC: 3043 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3044 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3045 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3046 WARN(1, 3047 "management cipher suite 0x%x enabled for data\n", 3048 build.key->conf.cipher); 3049 goto out; 3050 default: 3051 /* we don't know how to generate IVs for this at all */ 3052 if (WARN_ON(gen_iv)) 3053 goto out; 3054 /* pure hardware keys are OK, of course */ 3055 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3056 break; 3057 /* cipher scheme might require space allocation */ 3058 if (iv_spc && 3059 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3060 goto out; 3061 if (iv_spc) 3062 build.hdr_len += build.key->conf.iv_len; 3063 } 3064 3065 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3066 } 3067 3068 hdr->frame_control = fc; 3069 3070 memcpy(build.hdr + build.hdr_len, 3071 rfc1042_header, sizeof(rfc1042_header)); 3072 build.hdr_len += sizeof(rfc1042_header); 3073 3074 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3075 /* if the kmemdup fails, continue w/o fast_tx */ 3076 if (!fast_tx) 3077 goto out; 3078 3079 out: 3080 /* we might have raced against another call to this function */ 3081 old = rcu_dereference_protected(sta->fast_tx, 3082 lockdep_is_held(&sta->lock)); 3083 rcu_assign_pointer(sta->fast_tx, fast_tx); 3084 if (old) 3085 kfree_rcu(old, rcu_head); 3086 spin_unlock_bh(&sta->lock); 3087 } 3088 3089 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3090 { 3091 struct sta_info *sta; 3092 3093 rcu_read_lock(); 3094 list_for_each_entry_rcu(sta, &local->sta_list, list) 3095 ieee80211_check_fast_xmit(sta); 3096 rcu_read_unlock(); 3097 } 3098 3099 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3100 { 3101 struct ieee80211_local *local = sdata->local; 3102 struct sta_info *sta; 3103 3104 rcu_read_lock(); 3105 3106 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3107 if (sdata != sta->sdata && 3108 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3109 continue; 3110 ieee80211_check_fast_xmit(sta); 3111 } 3112 3113 rcu_read_unlock(); 3114 } 3115 3116 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3117 { 3118 struct ieee80211_fast_tx *fast_tx; 3119 3120 spin_lock_bh(&sta->lock); 3121 fast_tx = rcu_dereference_protected(sta->fast_tx, 3122 lockdep_is_held(&sta->lock)); 3123 RCU_INIT_POINTER(sta->fast_tx, NULL); 3124 spin_unlock_bh(&sta->lock); 3125 3126 if (fast_tx) 3127 kfree_rcu(fast_tx, rcu_head); 3128 } 3129 3130 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3131 struct sk_buff *skb, int headroom) 3132 { 3133 if (skb_headroom(skb) < headroom) { 3134 I802_DEBUG_INC(local->tx_expand_skb_head); 3135 3136 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3137 wiphy_debug(local->hw.wiphy, 3138 "failed to reallocate TX buffer\n"); 3139 return false; 3140 } 3141 } 3142 3143 return true; 3144 } 3145 3146 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3147 struct ieee80211_fast_tx *fast_tx, 3148 struct sk_buff *skb) 3149 { 3150 struct ieee80211_local *local = sdata->local; 3151 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3152 struct ieee80211_hdr *hdr; 3153 struct ethhdr *amsdu_hdr; 3154 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3155 int subframe_len = skb->len - hdr_len; 3156 void *data; 3157 u8 *qc, *h_80211_src, *h_80211_dst; 3158 const u8 *bssid; 3159 3160 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3161 return false; 3162 3163 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3164 return true; 3165 3166 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3167 return false; 3168 3169 data = skb_push(skb, sizeof(*amsdu_hdr)); 3170 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3171 hdr = data; 3172 amsdu_hdr = data + hdr_len; 3173 /* h_80211_src/dst is addr* field within hdr */ 3174 h_80211_src = data + fast_tx->sa_offs; 3175 h_80211_dst = data + fast_tx->da_offs; 3176 3177 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3178 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3179 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3180 3181 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3182 * fields needs to be changed to BSSID for A-MSDU frames depending 3183 * on FromDS/ToDS values. 3184 */ 3185 switch (sdata->vif.type) { 3186 case NL80211_IFTYPE_STATION: 3187 bssid = sdata->u.mgd.bssid; 3188 break; 3189 case NL80211_IFTYPE_AP: 3190 case NL80211_IFTYPE_AP_VLAN: 3191 bssid = sdata->vif.addr; 3192 break; 3193 default: 3194 bssid = NULL; 3195 } 3196 3197 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3198 ether_addr_copy(h_80211_src, bssid); 3199 3200 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3201 ether_addr_copy(h_80211_dst, bssid); 3202 3203 qc = ieee80211_get_qos_ctl(hdr); 3204 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3205 3206 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3207 3208 return true; 3209 } 3210 3211 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3212 struct sta_info *sta, 3213 struct ieee80211_fast_tx *fast_tx, 3214 struct sk_buff *skb) 3215 { 3216 struct ieee80211_local *local = sdata->local; 3217 struct fq *fq = &local->fq; 3218 struct fq_tin *tin; 3219 struct fq_flow *flow; 3220 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3221 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3222 struct txq_info *txqi; 3223 struct sk_buff **frag_tail, *head; 3224 int subframe_len = skb->len - ETH_ALEN; 3225 u8 max_subframes = sta->sta.max_amsdu_subframes; 3226 int max_frags = local->hw.max_tx_fragments; 3227 int max_amsdu_len = sta->sta.max_amsdu_len; 3228 int orig_truesize; 3229 u32 flow_idx; 3230 __be16 len; 3231 void *data; 3232 bool ret = false; 3233 unsigned int orig_len; 3234 int n = 2, nfrags, pad = 0; 3235 u16 hdrlen; 3236 3237 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3238 return false; 3239 3240 if (skb_is_gso(skb)) 3241 return false; 3242 3243 if (!txq) 3244 return false; 3245 3246 txqi = to_txq_info(txq); 3247 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3248 return false; 3249 3250 if (sta->sta.max_rc_amsdu_len) 3251 max_amsdu_len = min_t(int, max_amsdu_len, 3252 sta->sta.max_rc_amsdu_len); 3253 3254 if (sta->sta.max_tid_amsdu_len[tid]) 3255 max_amsdu_len = min_t(int, max_amsdu_len, 3256 sta->sta.max_tid_amsdu_len[tid]); 3257 3258 flow_idx = fq_flow_idx(fq, skb); 3259 3260 spin_lock_bh(&fq->lock); 3261 3262 /* TODO: Ideally aggregation should be done on dequeue to remain 3263 * responsive to environment changes. 3264 */ 3265 3266 tin = &txqi->tin; 3267 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3268 fq_flow_get_default_func); 3269 head = skb_peek_tail(&flow->queue); 3270 if (!head || skb_is_gso(head)) 3271 goto out; 3272 3273 orig_truesize = head->truesize; 3274 orig_len = head->len; 3275 3276 if (skb->len + head->len > max_amsdu_len) 3277 goto out; 3278 3279 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3280 nfrags += 1 + skb_shinfo(head)->nr_frags; 3281 frag_tail = &skb_shinfo(head)->frag_list; 3282 while (*frag_tail) { 3283 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3284 frag_tail = &(*frag_tail)->next; 3285 n++; 3286 } 3287 3288 if (max_subframes && n > max_subframes) 3289 goto out; 3290 3291 if (max_frags && nfrags > max_frags) 3292 goto out; 3293 3294 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3295 goto out; 3296 3297 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3298 goto out; 3299 3300 /* 3301 * Pad out the previous subframe to a multiple of 4 by adding the 3302 * padding to the next one, that's being added. Note that head->len 3303 * is the length of the full A-MSDU, but that works since each time 3304 * we add a new subframe we pad out the previous one to a multiple 3305 * of 4 and thus it no longer matters in the next round. 3306 */ 3307 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3308 if ((head->len - hdrlen) & 3) 3309 pad = 4 - ((head->len - hdrlen) & 3); 3310 3311 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3312 2 + pad)) 3313 goto out_recalc; 3314 3315 ret = true; 3316 data = skb_push(skb, ETH_ALEN + 2); 3317 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3318 3319 data += 2 * ETH_ALEN; 3320 len = cpu_to_be16(subframe_len); 3321 memcpy(data, &len, 2); 3322 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3323 3324 memset(skb_push(skb, pad), 0, pad); 3325 3326 head->len += skb->len; 3327 head->data_len += skb->len; 3328 *frag_tail = skb; 3329 3330 out_recalc: 3331 fq->memory_usage += head->truesize - orig_truesize; 3332 if (head->len != orig_len) { 3333 flow->backlog += head->len - orig_len; 3334 tin->backlog_bytes += head->len - orig_len; 3335 3336 fq_recalc_backlog(fq, tin, flow); 3337 } 3338 out: 3339 spin_unlock_bh(&fq->lock); 3340 3341 return ret; 3342 } 3343 3344 /* 3345 * Can be called while the sta lock is held. Anything that can cause packets to 3346 * be generated will cause deadlock! 3347 */ 3348 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3349 struct sta_info *sta, u8 pn_offs, 3350 struct ieee80211_key *key, 3351 struct sk_buff *skb) 3352 { 3353 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3354 struct ieee80211_hdr *hdr = (void *)skb->data; 3355 u8 tid = IEEE80211_NUM_TIDS; 3356 3357 if (key) 3358 info->control.hw_key = &key->conf; 3359 3360 ieee80211_tx_stats(skb->dev, skb->len); 3361 3362 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3363 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3364 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3365 } else { 3366 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3367 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3368 sdata->sequence_number += 0x10; 3369 } 3370 3371 if (skb_shinfo(skb)->gso_size) 3372 sta->tx_stats.msdu[tid] += 3373 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3374 else 3375 sta->tx_stats.msdu[tid]++; 3376 3377 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3378 3379 /* statistics normally done by ieee80211_tx_h_stats (but that 3380 * has to consider fragmentation, so is more complex) 3381 */ 3382 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3383 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3384 3385 if (pn_offs) { 3386 u64 pn; 3387 u8 *crypto_hdr = skb->data + pn_offs; 3388 3389 switch (key->conf.cipher) { 3390 case WLAN_CIPHER_SUITE_CCMP: 3391 case WLAN_CIPHER_SUITE_CCMP_256: 3392 case WLAN_CIPHER_SUITE_GCMP: 3393 case WLAN_CIPHER_SUITE_GCMP_256: 3394 pn = atomic64_inc_return(&key->conf.tx_pn); 3395 crypto_hdr[0] = pn; 3396 crypto_hdr[1] = pn >> 8; 3397 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3398 crypto_hdr[4] = pn >> 16; 3399 crypto_hdr[5] = pn >> 24; 3400 crypto_hdr[6] = pn >> 32; 3401 crypto_hdr[7] = pn >> 40; 3402 break; 3403 } 3404 } 3405 } 3406 3407 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3408 struct sta_info *sta, 3409 struct ieee80211_fast_tx *fast_tx, 3410 struct sk_buff *skb) 3411 { 3412 struct ieee80211_local *local = sdata->local; 3413 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3414 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3415 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3416 struct ethhdr eth; 3417 struct ieee80211_tx_info *info; 3418 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3419 struct ieee80211_tx_data tx; 3420 ieee80211_tx_result r; 3421 struct tid_ampdu_tx *tid_tx = NULL; 3422 u8 tid = IEEE80211_NUM_TIDS; 3423 3424 /* control port protocol needs a lot of special handling */ 3425 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3426 return false; 3427 3428 /* only RFC 1042 SNAP */ 3429 if (ethertype < ETH_P_802_3_MIN) 3430 return false; 3431 3432 /* don't handle TX status request here either */ 3433 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3434 return false; 3435 3436 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3437 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3438 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3439 if (tid_tx) { 3440 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3441 return false; 3442 if (tid_tx->timeout) 3443 tid_tx->last_tx = jiffies; 3444 } 3445 } 3446 3447 /* after this point (skb is modified) we cannot return false */ 3448 3449 if (skb_shared(skb)) { 3450 struct sk_buff *tmp_skb = skb; 3451 3452 skb = skb_clone(skb, GFP_ATOMIC); 3453 kfree_skb(tmp_skb); 3454 3455 if (!skb) 3456 return true; 3457 } 3458 3459 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3460 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3461 return true; 3462 3463 /* will not be crypto-handled beyond what we do here, so use false 3464 * as the may-encrypt argument for the resize to not account for 3465 * more room than we already have in 'extra_head' 3466 */ 3467 if (unlikely(ieee80211_skb_resize(sdata, skb, 3468 max_t(int, extra_head + hw_headroom - 3469 skb_headroom(skb), 0), 3470 false))) { 3471 kfree_skb(skb); 3472 return true; 3473 } 3474 3475 memcpy(ð, skb->data, ETH_HLEN - 2); 3476 hdr = skb_push(skb, extra_head); 3477 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3478 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3479 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3480 3481 info = IEEE80211_SKB_CB(skb); 3482 memset(info, 0, sizeof(*info)); 3483 info->band = fast_tx->band; 3484 info->control.vif = &sdata->vif; 3485 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3486 IEEE80211_TX_CTL_DONTFRAG | 3487 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3488 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3489 3490 #ifdef CONFIG_MAC80211_DEBUGFS 3491 if (local->force_tx_status) 3492 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3493 #endif 3494 3495 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3496 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3497 *ieee80211_get_qos_ctl(hdr) = tid; 3498 } 3499 3500 __skb_queue_head_init(&tx.skbs); 3501 3502 tx.flags = IEEE80211_TX_UNICAST; 3503 tx.local = local; 3504 tx.sdata = sdata; 3505 tx.sta = sta; 3506 tx.key = fast_tx->key; 3507 3508 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3509 tx.skb = skb; 3510 r = ieee80211_tx_h_rate_ctrl(&tx); 3511 skb = tx.skb; 3512 tx.skb = NULL; 3513 3514 if (r != TX_CONTINUE) { 3515 if (r != TX_QUEUED) 3516 kfree_skb(skb); 3517 return true; 3518 } 3519 } 3520 3521 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3522 return true; 3523 3524 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3525 fast_tx->key, skb); 3526 3527 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3528 sdata = container_of(sdata->bss, 3529 struct ieee80211_sub_if_data, u.ap); 3530 3531 __skb_queue_tail(&tx.skbs, skb); 3532 ieee80211_tx_frags(local, &sdata->vif, &sta->sta, &tx.skbs, false); 3533 return true; 3534 } 3535 3536 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3537 struct ieee80211_txq *txq) 3538 { 3539 struct ieee80211_local *local = hw_to_local(hw); 3540 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3541 struct ieee80211_hdr *hdr; 3542 struct sk_buff *skb = NULL; 3543 struct fq *fq = &local->fq; 3544 struct fq_tin *tin = &txqi->tin; 3545 struct ieee80211_tx_info *info; 3546 struct ieee80211_tx_data tx; 3547 ieee80211_tx_result r; 3548 struct ieee80211_vif *vif = txq->vif; 3549 3550 WARN_ON_ONCE(softirq_count() == 0); 3551 3552 begin: 3553 spin_lock_bh(&fq->lock); 3554 3555 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3556 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3557 goto out; 3558 3559 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3560 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3561 goto out; 3562 } 3563 3564 /* Make sure fragments stay together. */ 3565 skb = __skb_dequeue(&txqi->frags); 3566 if (skb) 3567 goto out; 3568 3569 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3570 if (!skb) 3571 goto out; 3572 3573 spin_unlock_bh(&fq->lock); 3574 3575 hdr = (struct ieee80211_hdr *)skb->data; 3576 info = IEEE80211_SKB_CB(skb); 3577 3578 memset(&tx, 0, sizeof(tx)); 3579 __skb_queue_head_init(&tx.skbs); 3580 tx.local = local; 3581 tx.skb = skb; 3582 tx.sdata = vif_to_sdata(info->control.vif); 3583 3584 if (txq->sta) 3585 tx.sta = container_of(txq->sta, struct sta_info, sta); 3586 3587 /* 3588 * The key can be removed while the packet was queued, so need to call 3589 * this here to get the current key. 3590 */ 3591 r = ieee80211_tx_h_select_key(&tx); 3592 if (r != TX_CONTINUE) { 3593 ieee80211_free_txskb(&local->hw, skb); 3594 goto begin; 3595 } 3596 3597 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3598 info->flags |= IEEE80211_TX_CTL_AMPDU; 3599 else 3600 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3601 3602 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3603 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3604 sta); 3605 u8 pn_offs = 0; 3606 3607 if (tx.key && 3608 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3609 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3610 3611 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3612 tx.key, skb); 3613 } else { 3614 if (invoke_tx_handlers_late(&tx)) 3615 goto begin; 3616 3617 skb = __skb_dequeue(&tx.skbs); 3618 3619 if (!skb_queue_empty(&tx.skbs)) { 3620 spin_lock_bh(&fq->lock); 3621 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3622 spin_unlock_bh(&fq->lock); 3623 } 3624 } 3625 3626 if (skb_has_frag_list(skb) && 3627 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3628 if (skb_linearize(skb)) { 3629 ieee80211_free_txskb(&local->hw, skb); 3630 goto begin; 3631 } 3632 } 3633 3634 switch (tx.sdata->vif.type) { 3635 case NL80211_IFTYPE_MONITOR: 3636 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3637 vif = &tx.sdata->vif; 3638 break; 3639 } 3640 tx.sdata = rcu_dereference(local->monitor_sdata); 3641 if (tx.sdata) { 3642 vif = &tx.sdata->vif; 3643 info->hw_queue = 3644 vif->hw_queue[skb_get_queue_mapping(skb)]; 3645 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3646 ieee80211_free_txskb(&local->hw, skb); 3647 goto begin; 3648 } else { 3649 vif = NULL; 3650 } 3651 break; 3652 case NL80211_IFTYPE_AP_VLAN: 3653 tx.sdata = container_of(tx.sdata->bss, 3654 struct ieee80211_sub_if_data, u.ap); 3655 /* fall through */ 3656 default: 3657 vif = &tx.sdata->vif; 3658 break; 3659 } 3660 3661 IEEE80211_SKB_CB(skb)->control.vif = vif; 3662 return skb; 3663 3664 out: 3665 spin_unlock_bh(&fq->lock); 3666 3667 return skb; 3668 } 3669 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3670 3671 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3672 { 3673 struct ieee80211_local *local = hw_to_local(hw); 3674 struct ieee80211_txq *ret = NULL; 3675 struct txq_info *txqi = NULL; 3676 3677 spin_lock_bh(&local->active_txq_lock[ac]); 3678 3679 begin: 3680 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3681 struct txq_info, 3682 schedule_order); 3683 if (!txqi) 3684 goto out; 3685 3686 if (txqi->txq.sta) { 3687 struct sta_info *sta = container_of(txqi->txq.sta, 3688 struct sta_info, sta); 3689 3690 if (sta->airtime[txqi->txq.ac].deficit < 0) { 3691 sta->airtime[txqi->txq.ac].deficit += 3692 sta->airtime_weight; 3693 list_move_tail(&txqi->schedule_order, 3694 &local->active_txqs[txqi->txq.ac]); 3695 goto begin; 3696 } 3697 } 3698 3699 3700 if (txqi->schedule_round == local->schedule_round[ac]) 3701 goto out; 3702 3703 list_del_init(&txqi->schedule_order); 3704 txqi->schedule_round = local->schedule_round[ac]; 3705 ret = &txqi->txq; 3706 3707 out: 3708 spin_unlock_bh(&local->active_txq_lock[ac]); 3709 return ret; 3710 } 3711 EXPORT_SYMBOL(ieee80211_next_txq); 3712 3713 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3714 struct ieee80211_txq *txq, 3715 bool force) 3716 { 3717 struct ieee80211_local *local = hw_to_local(hw); 3718 struct txq_info *txqi = to_txq_info(txq); 3719 3720 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3721 3722 if (list_empty(&txqi->schedule_order) && 3723 (force || !skb_queue_empty(&txqi->frags) || 3724 txqi->tin.backlog_packets)) { 3725 /* If airtime accounting is active, always enqueue STAs at the 3726 * head of the list to ensure that they only get moved to the 3727 * back by the airtime DRR scheduler once they have a negative 3728 * deficit. A station that already has a negative deficit will 3729 * get immediately moved to the back of the list on the next 3730 * call to ieee80211_next_txq(). 3731 */ 3732 if (txqi->txq.sta && 3733 wiphy_ext_feature_isset(local->hw.wiphy, 3734 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3735 list_add(&txqi->schedule_order, 3736 &local->active_txqs[txq->ac]); 3737 else 3738 list_add_tail(&txqi->schedule_order, 3739 &local->active_txqs[txq->ac]); 3740 } 3741 3742 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3743 } 3744 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3745 3746 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3747 struct ieee80211_txq *txq) 3748 { 3749 struct ieee80211_local *local = hw_to_local(hw); 3750 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3751 struct sta_info *sta; 3752 u8 ac = txq->ac; 3753 3754 spin_lock_bh(&local->active_txq_lock[ac]); 3755 3756 if (!txqi->txq.sta) 3757 goto out; 3758 3759 if (list_empty(&txqi->schedule_order)) 3760 goto out; 3761 3762 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3763 schedule_order) { 3764 if (iter == txqi) 3765 break; 3766 3767 if (!iter->txq.sta) { 3768 list_move_tail(&iter->schedule_order, 3769 &local->active_txqs[ac]); 3770 continue; 3771 } 3772 sta = container_of(iter->txq.sta, struct sta_info, sta); 3773 if (sta->airtime[ac].deficit < 0) 3774 sta->airtime[ac].deficit += sta->airtime_weight; 3775 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3776 } 3777 3778 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3779 if (sta->airtime[ac].deficit >= 0) 3780 goto out; 3781 3782 sta->airtime[ac].deficit += sta->airtime_weight; 3783 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3784 spin_unlock_bh(&local->active_txq_lock[ac]); 3785 3786 return false; 3787 out: 3788 if (!list_empty(&txqi->schedule_order)) 3789 list_del_init(&txqi->schedule_order); 3790 spin_unlock_bh(&local->active_txq_lock[ac]); 3791 3792 return true; 3793 } 3794 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3795 3796 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3797 { 3798 struct ieee80211_local *local = hw_to_local(hw); 3799 3800 spin_lock_bh(&local->active_txq_lock[ac]); 3801 local->schedule_round[ac]++; 3802 spin_unlock_bh(&local->active_txq_lock[ac]); 3803 } 3804 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3805 3806 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3807 struct net_device *dev, 3808 u32 info_flags, 3809 u32 ctrl_flags) 3810 { 3811 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3812 struct ieee80211_local *local = sdata->local; 3813 struct sta_info *sta; 3814 struct sk_buff *next; 3815 3816 if (unlikely(skb->len < ETH_HLEN)) { 3817 kfree_skb(skb); 3818 return; 3819 } 3820 3821 rcu_read_lock(); 3822 3823 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3824 goto out_free; 3825 3826 if (IS_ERR(sta)) 3827 sta = NULL; 3828 3829 if (local->ops->wake_tx_queue) { 3830 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3831 skb_set_queue_mapping(skb, queue); 3832 } 3833 3834 if (sta) { 3835 struct ieee80211_fast_tx *fast_tx; 3836 3837 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3838 3839 fast_tx = rcu_dereference(sta->fast_tx); 3840 3841 if (fast_tx && 3842 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3843 goto out; 3844 } 3845 3846 if (skb_is_gso(skb)) { 3847 struct sk_buff *segs; 3848 3849 segs = skb_gso_segment(skb, 0); 3850 if (IS_ERR(segs)) { 3851 goto out_free; 3852 } else if (segs) { 3853 consume_skb(skb); 3854 skb = segs; 3855 } 3856 } else { 3857 /* we cannot process non-linear frames on this path */ 3858 if (skb_linearize(skb)) { 3859 kfree_skb(skb); 3860 goto out; 3861 } 3862 3863 /* the frame could be fragmented, software-encrypted, and other 3864 * things so we cannot really handle checksum offload with it - 3865 * fix it up in software before we handle anything else. 3866 */ 3867 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3868 skb_set_transport_header(skb, 3869 skb_checksum_start_offset(skb)); 3870 if (skb_checksum_help(skb)) 3871 goto out_free; 3872 } 3873 } 3874 3875 next = skb; 3876 while (next) { 3877 skb = next; 3878 next = skb->next; 3879 3880 skb->prev = NULL; 3881 skb->next = NULL; 3882 3883 skb = ieee80211_build_hdr(sdata, skb, info_flags, 3884 sta, ctrl_flags); 3885 if (IS_ERR(skb)) 3886 goto out; 3887 3888 ieee80211_tx_stats(dev, skb->len); 3889 3890 ieee80211_xmit(sdata, sta, skb, 0); 3891 } 3892 goto out; 3893 out_free: 3894 kfree_skb(skb); 3895 out: 3896 rcu_read_unlock(); 3897 } 3898 3899 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3900 { 3901 struct ethhdr *eth; 3902 int err; 3903 3904 err = skb_ensure_writable(skb, ETH_HLEN); 3905 if (unlikely(err)) 3906 return err; 3907 3908 eth = (void *)skb->data; 3909 ether_addr_copy(eth->h_dest, sta->sta.addr); 3910 3911 return 0; 3912 } 3913 3914 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3915 struct net_device *dev) 3916 { 3917 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3918 const struct ethhdr *eth = (void *)skb->data; 3919 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3920 __be16 ethertype; 3921 3922 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3923 return false; 3924 3925 switch (sdata->vif.type) { 3926 case NL80211_IFTYPE_AP_VLAN: 3927 if (sdata->u.vlan.sta) 3928 return false; 3929 if (sdata->wdev.use_4addr) 3930 return false; 3931 /* fall through */ 3932 case NL80211_IFTYPE_AP: 3933 /* check runtime toggle for this bss */ 3934 if (!sdata->bss->multicast_to_unicast) 3935 return false; 3936 break; 3937 default: 3938 return false; 3939 } 3940 3941 /* multicast to unicast conversion only for some payload */ 3942 ethertype = eth->h_proto; 3943 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3944 ethertype = ethvlan->h_vlan_encapsulated_proto; 3945 switch (ethertype) { 3946 case htons(ETH_P_ARP): 3947 case htons(ETH_P_IP): 3948 case htons(ETH_P_IPV6): 3949 break; 3950 default: 3951 return false; 3952 } 3953 3954 return true; 3955 } 3956 3957 static void 3958 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3959 struct sk_buff_head *queue) 3960 { 3961 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3962 struct ieee80211_local *local = sdata->local; 3963 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3964 struct sta_info *sta, *first = NULL; 3965 struct sk_buff *cloned_skb; 3966 3967 rcu_read_lock(); 3968 3969 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3970 if (sdata != sta->sdata) 3971 /* AP-VLAN mismatch */ 3972 continue; 3973 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3974 /* do not send back to source */ 3975 continue; 3976 if (!first) { 3977 first = sta; 3978 continue; 3979 } 3980 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3981 if (!cloned_skb) 3982 goto multicast; 3983 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3984 dev_kfree_skb(cloned_skb); 3985 goto multicast; 3986 } 3987 __skb_queue_tail(queue, cloned_skb); 3988 } 3989 3990 if (likely(first)) { 3991 if (unlikely(ieee80211_change_da(skb, first))) 3992 goto multicast; 3993 __skb_queue_tail(queue, skb); 3994 } else { 3995 /* no STA connected, drop */ 3996 kfree_skb(skb); 3997 skb = NULL; 3998 } 3999 4000 goto out; 4001 multicast: 4002 __skb_queue_purge(queue); 4003 __skb_queue_tail(queue, skb); 4004 out: 4005 rcu_read_unlock(); 4006 } 4007 4008 /** 4009 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4010 * @skb: packet to be sent 4011 * @dev: incoming interface 4012 * 4013 * On failure skb will be freed. 4014 */ 4015 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4016 struct net_device *dev) 4017 { 4018 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4019 struct sk_buff_head queue; 4020 4021 __skb_queue_head_init(&queue); 4022 ieee80211_convert_to_unicast(skb, dev, &queue); 4023 while ((skb = __skb_dequeue(&queue))) 4024 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4025 } else { 4026 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4027 } 4028 4029 return NETDEV_TX_OK; 4030 } 4031 4032 struct sk_buff * 4033 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4034 struct sk_buff *skb, u32 info_flags) 4035 { 4036 struct ieee80211_hdr *hdr; 4037 struct ieee80211_tx_data tx = { 4038 .local = sdata->local, 4039 .sdata = sdata, 4040 }; 4041 struct sta_info *sta; 4042 4043 rcu_read_lock(); 4044 4045 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4046 kfree_skb(skb); 4047 skb = ERR_PTR(-EINVAL); 4048 goto out; 4049 } 4050 4051 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0); 4052 if (IS_ERR(skb)) 4053 goto out; 4054 4055 hdr = (void *)skb->data; 4056 tx.sta = sta_info_get(sdata, hdr->addr1); 4057 tx.skb = skb; 4058 4059 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4060 rcu_read_unlock(); 4061 kfree_skb(skb); 4062 return ERR_PTR(-EINVAL); 4063 } 4064 4065 out: 4066 rcu_read_unlock(); 4067 return skb; 4068 } 4069 4070 /* 4071 * ieee80211_clear_tx_pending may not be called in a context where 4072 * it is possible that it packets could come in again. 4073 */ 4074 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4075 { 4076 struct sk_buff *skb; 4077 int i; 4078 4079 for (i = 0; i < local->hw.queues; i++) { 4080 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4081 ieee80211_free_txskb(&local->hw, skb); 4082 } 4083 } 4084 4085 /* 4086 * Returns false if the frame couldn't be transmitted but was queued instead, 4087 * which in this case means re-queued -- take as an indication to stop sending 4088 * more pending frames. 4089 */ 4090 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4091 struct sk_buff *skb) 4092 { 4093 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4094 struct ieee80211_sub_if_data *sdata; 4095 struct sta_info *sta; 4096 struct ieee80211_hdr *hdr; 4097 bool result; 4098 struct ieee80211_chanctx_conf *chanctx_conf; 4099 4100 sdata = vif_to_sdata(info->control.vif); 4101 4102 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 4103 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4104 if (unlikely(!chanctx_conf)) { 4105 dev_kfree_skb(skb); 4106 return true; 4107 } 4108 info->band = chanctx_conf->def.chan->band; 4109 result = ieee80211_tx(sdata, NULL, skb, true, 0); 4110 } else { 4111 struct sk_buff_head skbs; 4112 4113 __skb_queue_head_init(&skbs); 4114 __skb_queue_tail(&skbs, skb); 4115 4116 hdr = (struct ieee80211_hdr *)skb->data; 4117 sta = sta_info_get(sdata, hdr->addr1); 4118 4119 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4120 } 4121 4122 return result; 4123 } 4124 4125 /* 4126 * Transmit all pending packets. Called from tasklet. 4127 */ 4128 void ieee80211_tx_pending(unsigned long data) 4129 { 4130 struct ieee80211_local *local = (struct ieee80211_local *)data; 4131 unsigned long flags; 4132 int i; 4133 bool txok; 4134 4135 rcu_read_lock(); 4136 4137 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4138 for (i = 0; i < local->hw.queues; i++) { 4139 /* 4140 * If queue is stopped by something other than due to pending 4141 * frames, or we have no pending frames, proceed to next queue. 4142 */ 4143 if (local->queue_stop_reasons[i] || 4144 skb_queue_empty(&local->pending[i])) 4145 continue; 4146 4147 while (!skb_queue_empty(&local->pending[i])) { 4148 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4149 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4150 4151 if (WARN_ON(!info->control.vif)) { 4152 ieee80211_free_txskb(&local->hw, skb); 4153 continue; 4154 } 4155 4156 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4157 flags); 4158 4159 txok = ieee80211_tx_pending_skb(local, skb); 4160 spin_lock_irqsave(&local->queue_stop_reason_lock, 4161 flags); 4162 if (!txok) 4163 break; 4164 } 4165 4166 if (skb_queue_empty(&local->pending[i])) 4167 ieee80211_propagate_queue_wake(local, i); 4168 } 4169 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4170 4171 rcu_read_unlock(); 4172 } 4173 4174 /* functions for drivers to get certain frames */ 4175 4176 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4177 struct ps_data *ps, struct sk_buff *skb, 4178 bool is_template) 4179 { 4180 u8 *pos, *tim; 4181 int aid0 = 0; 4182 int i, have_bits = 0, n1, n2; 4183 4184 /* Generate bitmap for TIM only if there are any STAs in power save 4185 * mode. */ 4186 if (atomic_read(&ps->num_sta_ps) > 0) 4187 /* in the hope that this is faster than 4188 * checking byte-for-byte */ 4189 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4190 IEEE80211_MAX_AID+1); 4191 if (!is_template) { 4192 if (ps->dtim_count == 0) 4193 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4194 else 4195 ps->dtim_count--; 4196 } 4197 4198 tim = pos = skb_put(skb, 6); 4199 *pos++ = WLAN_EID_TIM; 4200 *pos++ = 4; 4201 *pos++ = ps->dtim_count; 4202 *pos++ = sdata->vif.bss_conf.dtim_period; 4203 4204 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4205 aid0 = 1; 4206 4207 ps->dtim_bc_mc = aid0 == 1; 4208 4209 if (have_bits) { 4210 /* Find largest even number N1 so that bits numbered 1 through 4211 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4212 * (N2 + 1) x 8 through 2007 are 0. */ 4213 n1 = 0; 4214 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4215 if (ps->tim[i]) { 4216 n1 = i & 0xfe; 4217 break; 4218 } 4219 } 4220 n2 = n1; 4221 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4222 if (ps->tim[i]) { 4223 n2 = i; 4224 break; 4225 } 4226 } 4227 4228 /* Bitmap control */ 4229 *pos++ = n1 | aid0; 4230 /* Part Virt Bitmap */ 4231 skb_put(skb, n2 - n1); 4232 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4233 4234 tim[1] = n2 - n1 + 4; 4235 } else { 4236 *pos++ = aid0; /* Bitmap control */ 4237 *pos++ = 0; /* Part Virt Bitmap */ 4238 } 4239 } 4240 4241 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4242 struct ps_data *ps, struct sk_buff *skb, 4243 bool is_template) 4244 { 4245 struct ieee80211_local *local = sdata->local; 4246 4247 /* 4248 * Not very nice, but we want to allow the driver to call 4249 * ieee80211_beacon_get() as a response to the set_tim() 4250 * callback. That, however, is already invoked under the 4251 * sta_lock to guarantee consistent and race-free update 4252 * of the tim bitmap in mac80211 and the driver. 4253 */ 4254 if (local->tim_in_locked_section) { 4255 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4256 } else { 4257 spin_lock_bh(&local->tim_lock); 4258 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4259 spin_unlock_bh(&local->tim_lock); 4260 } 4261 4262 return 0; 4263 } 4264 4265 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4266 struct beacon_data *beacon) 4267 { 4268 struct probe_resp *resp; 4269 u8 *beacon_data; 4270 size_t beacon_data_len; 4271 int i; 4272 u8 count = beacon->csa_current_counter; 4273 4274 switch (sdata->vif.type) { 4275 case NL80211_IFTYPE_AP: 4276 beacon_data = beacon->tail; 4277 beacon_data_len = beacon->tail_len; 4278 break; 4279 case NL80211_IFTYPE_ADHOC: 4280 beacon_data = beacon->head; 4281 beacon_data_len = beacon->head_len; 4282 break; 4283 case NL80211_IFTYPE_MESH_POINT: 4284 beacon_data = beacon->head; 4285 beacon_data_len = beacon->head_len; 4286 break; 4287 default: 4288 return; 4289 } 4290 4291 rcu_read_lock(); 4292 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4293 resp = rcu_dereference(sdata->u.ap.probe_resp); 4294 4295 if (beacon->csa_counter_offsets[i]) { 4296 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4297 beacon_data_len)) { 4298 rcu_read_unlock(); 4299 return; 4300 } 4301 4302 beacon_data[beacon->csa_counter_offsets[i]] = count; 4303 } 4304 4305 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4306 resp->data[resp->csa_counter_offsets[i]] = count; 4307 } 4308 rcu_read_unlock(); 4309 } 4310 4311 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4312 { 4313 beacon->csa_current_counter--; 4314 4315 /* the counter should never reach 0 */ 4316 WARN_ON_ONCE(!beacon->csa_current_counter); 4317 4318 return beacon->csa_current_counter; 4319 } 4320 4321 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4322 { 4323 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4324 struct beacon_data *beacon = NULL; 4325 u8 count = 0; 4326 4327 rcu_read_lock(); 4328 4329 if (sdata->vif.type == NL80211_IFTYPE_AP) 4330 beacon = rcu_dereference(sdata->u.ap.beacon); 4331 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4332 beacon = rcu_dereference(sdata->u.ibss.presp); 4333 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4334 beacon = rcu_dereference(sdata->u.mesh.beacon); 4335 4336 if (!beacon) 4337 goto unlock; 4338 4339 count = __ieee80211_csa_update_counter(beacon); 4340 4341 unlock: 4342 rcu_read_unlock(); 4343 return count; 4344 } 4345 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4346 4347 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4348 { 4349 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4350 struct beacon_data *beacon = NULL; 4351 4352 rcu_read_lock(); 4353 4354 if (sdata->vif.type == NL80211_IFTYPE_AP) 4355 beacon = rcu_dereference(sdata->u.ap.beacon); 4356 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4357 beacon = rcu_dereference(sdata->u.ibss.presp); 4358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4359 beacon = rcu_dereference(sdata->u.mesh.beacon); 4360 4361 if (!beacon) 4362 goto unlock; 4363 4364 if (counter < beacon->csa_current_counter) 4365 beacon->csa_current_counter = counter; 4366 4367 unlock: 4368 rcu_read_unlock(); 4369 } 4370 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4371 4372 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4373 { 4374 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4375 struct beacon_data *beacon = NULL; 4376 u8 *beacon_data; 4377 size_t beacon_data_len; 4378 int ret = false; 4379 4380 if (!ieee80211_sdata_running(sdata)) 4381 return false; 4382 4383 rcu_read_lock(); 4384 if (vif->type == NL80211_IFTYPE_AP) { 4385 struct ieee80211_if_ap *ap = &sdata->u.ap; 4386 4387 beacon = rcu_dereference(ap->beacon); 4388 if (WARN_ON(!beacon || !beacon->tail)) 4389 goto out; 4390 beacon_data = beacon->tail; 4391 beacon_data_len = beacon->tail_len; 4392 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4393 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4394 4395 beacon = rcu_dereference(ifibss->presp); 4396 if (!beacon) 4397 goto out; 4398 4399 beacon_data = beacon->head; 4400 beacon_data_len = beacon->head_len; 4401 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4402 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4403 4404 beacon = rcu_dereference(ifmsh->beacon); 4405 if (!beacon) 4406 goto out; 4407 4408 beacon_data = beacon->head; 4409 beacon_data_len = beacon->head_len; 4410 } else { 4411 WARN_ON(1); 4412 goto out; 4413 } 4414 4415 if (!beacon->csa_counter_offsets[0]) 4416 goto out; 4417 4418 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4419 goto out; 4420 4421 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4422 ret = true; 4423 out: 4424 rcu_read_unlock(); 4425 4426 return ret; 4427 } 4428 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4429 4430 static struct sk_buff * 4431 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4432 struct ieee80211_vif *vif, 4433 struct ieee80211_mutable_offsets *offs, 4434 bool is_template) 4435 { 4436 struct ieee80211_local *local = hw_to_local(hw); 4437 struct beacon_data *beacon = NULL; 4438 struct sk_buff *skb = NULL; 4439 struct ieee80211_tx_info *info; 4440 struct ieee80211_sub_if_data *sdata = NULL; 4441 enum nl80211_band band; 4442 struct ieee80211_tx_rate_control txrc; 4443 struct ieee80211_chanctx_conf *chanctx_conf; 4444 int csa_off_base = 0; 4445 4446 rcu_read_lock(); 4447 4448 sdata = vif_to_sdata(vif); 4449 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4450 4451 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4452 goto out; 4453 4454 if (offs) 4455 memset(offs, 0, sizeof(*offs)); 4456 4457 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4458 struct ieee80211_if_ap *ap = &sdata->u.ap; 4459 4460 beacon = rcu_dereference(ap->beacon); 4461 if (beacon) { 4462 if (beacon->csa_counter_offsets[0]) { 4463 if (!is_template) 4464 __ieee80211_csa_update_counter(beacon); 4465 4466 ieee80211_set_csa(sdata, beacon); 4467 } 4468 4469 /* 4470 * headroom, head length, 4471 * tail length and maximum TIM length 4472 */ 4473 skb = dev_alloc_skb(local->tx_headroom + 4474 beacon->head_len + 4475 beacon->tail_len + 256 + 4476 local->hw.extra_beacon_tailroom); 4477 if (!skb) 4478 goto out; 4479 4480 skb_reserve(skb, local->tx_headroom); 4481 skb_put_data(skb, beacon->head, beacon->head_len); 4482 4483 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4484 is_template); 4485 4486 if (offs) { 4487 offs->tim_offset = beacon->head_len; 4488 offs->tim_length = skb->len - beacon->head_len; 4489 4490 /* for AP the csa offsets are from tail */ 4491 csa_off_base = skb->len; 4492 } 4493 4494 if (beacon->tail) 4495 skb_put_data(skb, beacon->tail, 4496 beacon->tail_len); 4497 } else 4498 goto out; 4499 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4500 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4501 struct ieee80211_hdr *hdr; 4502 4503 beacon = rcu_dereference(ifibss->presp); 4504 if (!beacon) 4505 goto out; 4506 4507 if (beacon->csa_counter_offsets[0]) { 4508 if (!is_template) 4509 __ieee80211_csa_update_counter(beacon); 4510 4511 ieee80211_set_csa(sdata, beacon); 4512 } 4513 4514 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4515 local->hw.extra_beacon_tailroom); 4516 if (!skb) 4517 goto out; 4518 skb_reserve(skb, local->tx_headroom); 4519 skb_put_data(skb, beacon->head, beacon->head_len); 4520 4521 hdr = (struct ieee80211_hdr *) skb->data; 4522 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4523 IEEE80211_STYPE_BEACON); 4524 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4525 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4526 4527 beacon = rcu_dereference(ifmsh->beacon); 4528 if (!beacon) 4529 goto out; 4530 4531 if (beacon->csa_counter_offsets[0]) { 4532 if (!is_template) 4533 /* TODO: For mesh csa_counter is in TU, so 4534 * decrementing it by one isn't correct, but 4535 * for now we leave it consistent with overall 4536 * mac80211's behavior. 4537 */ 4538 __ieee80211_csa_update_counter(beacon); 4539 4540 ieee80211_set_csa(sdata, beacon); 4541 } 4542 4543 if (ifmsh->sync_ops) 4544 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4545 4546 skb = dev_alloc_skb(local->tx_headroom + 4547 beacon->head_len + 4548 256 + /* TIM IE */ 4549 beacon->tail_len + 4550 local->hw.extra_beacon_tailroom); 4551 if (!skb) 4552 goto out; 4553 skb_reserve(skb, local->tx_headroom); 4554 skb_put_data(skb, beacon->head, beacon->head_len); 4555 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4556 4557 if (offs) { 4558 offs->tim_offset = beacon->head_len; 4559 offs->tim_length = skb->len - beacon->head_len; 4560 } 4561 4562 skb_put_data(skb, beacon->tail, beacon->tail_len); 4563 } else { 4564 WARN_ON(1); 4565 goto out; 4566 } 4567 4568 /* CSA offsets */ 4569 if (offs && beacon) { 4570 int i; 4571 4572 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4573 u16 csa_off = beacon->csa_counter_offsets[i]; 4574 4575 if (!csa_off) 4576 continue; 4577 4578 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4579 } 4580 } 4581 4582 band = chanctx_conf->def.chan->band; 4583 4584 info = IEEE80211_SKB_CB(skb); 4585 4586 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4587 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4588 info->band = band; 4589 4590 memset(&txrc, 0, sizeof(txrc)); 4591 txrc.hw = hw; 4592 txrc.sband = local->hw.wiphy->bands[band]; 4593 txrc.bss_conf = &sdata->vif.bss_conf; 4594 txrc.skb = skb; 4595 txrc.reported_rate.idx = -1; 4596 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4597 txrc.bss = true; 4598 rate_control_get_rate(sdata, NULL, &txrc); 4599 4600 info->control.vif = vif; 4601 4602 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4603 IEEE80211_TX_CTL_ASSIGN_SEQ | 4604 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4605 out: 4606 rcu_read_unlock(); 4607 return skb; 4608 4609 } 4610 4611 struct sk_buff * 4612 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4613 struct ieee80211_vif *vif, 4614 struct ieee80211_mutable_offsets *offs) 4615 { 4616 return __ieee80211_beacon_get(hw, vif, offs, true); 4617 } 4618 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4619 4620 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4621 struct ieee80211_vif *vif, 4622 u16 *tim_offset, u16 *tim_length) 4623 { 4624 struct ieee80211_mutable_offsets offs = {}; 4625 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4626 struct sk_buff *copy; 4627 struct ieee80211_supported_band *sband; 4628 int shift; 4629 4630 if (!bcn) 4631 return bcn; 4632 4633 if (tim_offset) 4634 *tim_offset = offs.tim_offset; 4635 4636 if (tim_length) 4637 *tim_length = offs.tim_length; 4638 4639 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4640 !hw_to_local(hw)->monitors) 4641 return bcn; 4642 4643 /* send a copy to monitor interfaces */ 4644 copy = skb_copy(bcn, GFP_ATOMIC); 4645 if (!copy) 4646 return bcn; 4647 4648 shift = ieee80211_vif_get_shift(vif); 4649 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4650 if (!sband) 4651 return bcn; 4652 4653 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4654 NULL); 4655 4656 return bcn; 4657 } 4658 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4659 4660 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4661 struct ieee80211_vif *vif) 4662 { 4663 struct ieee80211_if_ap *ap = NULL; 4664 struct sk_buff *skb = NULL; 4665 struct probe_resp *presp = NULL; 4666 struct ieee80211_hdr *hdr; 4667 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4668 4669 if (sdata->vif.type != NL80211_IFTYPE_AP) 4670 return NULL; 4671 4672 rcu_read_lock(); 4673 4674 ap = &sdata->u.ap; 4675 presp = rcu_dereference(ap->probe_resp); 4676 if (!presp) 4677 goto out; 4678 4679 skb = dev_alloc_skb(presp->len); 4680 if (!skb) 4681 goto out; 4682 4683 skb_put_data(skb, presp->data, presp->len); 4684 4685 hdr = (struct ieee80211_hdr *) skb->data; 4686 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4687 4688 out: 4689 rcu_read_unlock(); 4690 return skb; 4691 } 4692 EXPORT_SYMBOL(ieee80211_proberesp_get); 4693 4694 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4695 struct ieee80211_vif *vif) 4696 { 4697 struct ieee80211_sub_if_data *sdata; 4698 struct ieee80211_if_managed *ifmgd; 4699 struct ieee80211_pspoll *pspoll; 4700 struct ieee80211_local *local; 4701 struct sk_buff *skb; 4702 4703 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4704 return NULL; 4705 4706 sdata = vif_to_sdata(vif); 4707 ifmgd = &sdata->u.mgd; 4708 local = sdata->local; 4709 4710 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4711 if (!skb) 4712 return NULL; 4713 4714 skb_reserve(skb, local->hw.extra_tx_headroom); 4715 4716 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4717 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4718 IEEE80211_STYPE_PSPOLL); 4719 pspoll->aid = cpu_to_le16(ifmgd->aid); 4720 4721 /* aid in PS-Poll has its two MSBs each set to 1 */ 4722 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4723 4724 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4725 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4726 4727 return skb; 4728 } 4729 EXPORT_SYMBOL(ieee80211_pspoll_get); 4730 4731 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4732 struct ieee80211_vif *vif, 4733 bool qos_ok) 4734 { 4735 struct ieee80211_hdr_3addr *nullfunc; 4736 struct ieee80211_sub_if_data *sdata; 4737 struct ieee80211_if_managed *ifmgd; 4738 struct ieee80211_local *local; 4739 struct sk_buff *skb; 4740 bool qos = false; 4741 4742 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4743 return NULL; 4744 4745 sdata = vif_to_sdata(vif); 4746 ifmgd = &sdata->u.mgd; 4747 local = sdata->local; 4748 4749 if (qos_ok) { 4750 struct sta_info *sta; 4751 4752 rcu_read_lock(); 4753 sta = sta_info_get(sdata, ifmgd->bssid); 4754 qos = sta && sta->sta.wme; 4755 rcu_read_unlock(); 4756 } 4757 4758 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4759 sizeof(*nullfunc) + 2); 4760 if (!skb) 4761 return NULL; 4762 4763 skb_reserve(skb, local->hw.extra_tx_headroom); 4764 4765 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4766 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4767 IEEE80211_STYPE_NULLFUNC | 4768 IEEE80211_FCTL_TODS); 4769 if (qos) { 4770 __le16 qoshdr = cpu_to_le16(7); 4771 4772 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4773 IEEE80211_STYPE_NULLFUNC) != 4774 IEEE80211_STYPE_QOS_NULLFUNC); 4775 nullfunc->frame_control |= 4776 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4777 skb->priority = 7; 4778 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4779 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 4780 } 4781 4782 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4783 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4784 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4785 4786 return skb; 4787 } 4788 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4789 4790 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4791 const u8 *src_addr, 4792 const u8 *ssid, size_t ssid_len, 4793 size_t tailroom) 4794 { 4795 struct ieee80211_local *local = hw_to_local(hw); 4796 struct ieee80211_hdr_3addr *hdr; 4797 struct sk_buff *skb; 4798 size_t ie_ssid_len; 4799 u8 *pos; 4800 4801 ie_ssid_len = 2 + ssid_len; 4802 4803 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4804 ie_ssid_len + tailroom); 4805 if (!skb) 4806 return NULL; 4807 4808 skb_reserve(skb, local->hw.extra_tx_headroom); 4809 4810 hdr = skb_put_zero(skb, sizeof(*hdr)); 4811 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4812 IEEE80211_STYPE_PROBE_REQ); 4813 eth_broadcast_addr(hdr->addr1); 4814 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4815 eth_broadcast_addr(hdr->addr3); 4816 4817 pos = skb_put(skb, ie_ssid_len); 4818 *pos++ = WLAN_EID_SSID; 4819 *pos++ = ssid_len; 4820 if (ssid_len) 4821 memcpy(pos, ssid, ssid_len); 4822 pos += ssid_len; 4823 4824 return skb; 4825 } 4826 EXPORT_SYMBOL(ieee80211_probereq_get); 4827 4828 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4829 const void *frame, size_t frame_len, 4830 const struct ieee80211_tx_info *frame_txctl, 4831 struct ieee80211_rts *rts) 4832 { 4833 const struct ieee80211_hdr *hdr = frame; 4834 4835 rts->frame_control = 4836 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4837 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4838 frame_txctl); 4839 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4840 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4841 } 4842 EXPORT_SYMBOL(ieee80211_rts_get); 4843 4844 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4845 const void *frame, size_t frame_len, 4846 const struct ieee80211_tx_info *frame_txctl, 4847 struct ieee80211_cts *cts) 4848 { 4849 const struct ieee80211_hdr *hdr = frame; 4850 4851 cts->frame_control = 4852 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4853 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4854 frame_len, frame_txctl); 4855 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4856 } 4857 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4858 4859 struct sk_buff * 4860 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4861 struct ieee80211_vif *vif) 4862 { 4863 struct ieee80211_local *local = hw_to_local(hw); 4864 struct sk_buff *skb = NULL; 4865 struct ieee80211_tx_data tx; 4866 struct ieee80211_sub_if_data *sdata; 4867 struct ps_data *ps; 4868 struct ieee80211_tx_info *info; 4869 struct ieee80211_chanctx_conf *chanctx_conf; 4870 4871 sdata = vif_to_sdata(vif); 4872 4873 rcu_read_lock(); 4874 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4875 4876 if (!chanctx_conf) 4877 goto out; 4878 4879 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4880 struct beacon_data *beacon = 4881 rcu_dereference(sdata->u.ap.beacon); 4882 4883 if (!beacon || !beacon->head) 4884 goto out; 4885 4886 ps = &sdata->u.ap.ps; 4887 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4888 ps = &sdata->u.mesh.ps; 4889 } else { 4890 goto out; 4891 } 4892 4893 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4894 goto out; /* send buffered bc/mc only after DTIM beacon */ 4895 4896 while (1) { 4897 skb = skb_dequeue(&ps->bc_buf); 4898 if (!skb) 4899 goto out; 4900 local->total_ps_buffered--; 4901 4902 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4903 struct ieee80211_hdr *hdr = 4904 (struct ieee80211_hdr *) skb->data; 4905 /* more buffered multicast/broadcast frames ==> set 4906 * MoreData flag in IEEE 802.11 header to inform PS 4907 * STAs */ 4908 hdr->frame_control |= 4909 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4910 } 4911 4912 if (sdata->vif.type == NL80211_IFTYPE_AP) 4913 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4914 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4915 break; 4916 ieee80211_free_txskb(hw, skb); 4917 } 4918 4919 info = IEEE80211_SKB_CB(skb); 4920 4921 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4922 info->band = chanctx_conf->def.chan->band; 4923 4924 if (invoke_tx_handlers(&tx)) 4925 skb = NULL; 4926 out: 4927 rcu_read_unlock(); 4928 4929 return skb; 4930 } 4931 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4932 4933 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4934 { 4935 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4936 struct ieee80211_sub_if_data *sdata = sta->sdata; 4937 struct ieee80211_local *local = sdata->local; 4938 int ret; 4939 u32 queues; 4940 4941 lockdep_assert_held(&local->sta_mtx); 4942 4943 /* only some cases are supported right now */ 4944 switch (sdata->vif.type) { 4945 case NL80211_IFTYPE_STATION: 4946 case NL80211_IFTYPE_AP: 4947 case NL80211_IFTYPE_AP_VLAN: 4948 break; 4949 default: 4950 WARN_ON(1); 4951 return -EINVAL; 4952 } 4953 4954 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4955 return -EINVAL; 4956 4957 if (sta->reserved_tid == tid) { 4958 ret = 0; 4959 goto out; 4960 } 4961 4962 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4963 sdata_err(sdata, "TID reservation already active\n"); 4964 ret = -EALREADY; 4965 goto out; 4966 } 4967 4968 ieee80211_stop_vif_queues(sdata->local, sdata, 4969 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4970 4971 synchronize_net(); 4972 4973 /* Tear down BA sessions so we stop aggregating on this TID */ 4974 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4975 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4976 __ieee80211_stop_tx_ba_session(sta, tid, 4977 AGG_STOP_LOCAL_REQUEST); 4978 } 4979 4980 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4981 __ieee80211_flush_queues(local, sdata, queues, false); 4982 4983 sta->reserved_tid = tid; 4984 4985 ieee80211_wake_vif_queues(local, sdata, 4986 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4987 4988 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4989 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4990 4991 ret = 0; 4992 out: 4993 return ret; 4994 } 4995 EXPORT_SYMBOL(ieee80211_reserve_tid); 4996 4997 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4998 { 4999 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5000 struct ieee80211_sub_if_data *sdata = sta->sdata; 5001 5002 lockdep_assert_held(&sdata->local->sta_mtx); 5003 5004 /* only some cases are supported right now */ 5005 switch (sdata->vif.type) { 5006 case NL80211_IFTYPE_STATION: 5007 case NL80211_IFTYPE_AP: 5008 case NL80211_IFTYPE_AP_VLAN: 5009 break; 5010 default: 5011 WARN_ON(1); 5012 return; 5013 } 5014 5015 if (tid != sta->reserved_tid) { 5016 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5017 return; 5018 } 5019 5020 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5021 } 5022 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5023 5024 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5025 struct sk_buff *skb, int tid, 5026 enum nl80211_band band, u32 txdata_flags) 5027 { 5028 int ac = ieee80211_ac_from_tid(tid); 5029 5030 skb_reset_mac_header(skb); 5031 skb_set_queue_mapping(skb, ac); 5032 skb->priority = tid; 5033 5034 skb->dev = sdata->dev; 5035 5036 /* 5037 * The other path calling ieee80211_xmit is from the tasklet, 5038 * and while we can handle concurrent transmissions locking 5039 * requirements are that we do not come into tx with bhs on. 5040 */ 5041 local_bh_disable(); 5042 IEEE80211_SKB_CB(skb)->band = band; 5043 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 5044 local_bh_enable(); 5045 } 5046 5047 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5048 const u8 *buf, size_t len, 5049 const u8 *dest, __be16 proto, bool unencrypted) 5050 { 5051 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5052 struct ieee80211_local *local = sdata->local; 5053 struct sk_buff *skb; 5054 struct ethhdr *ehdr; 5055 u32 flags; 5056 5057 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5058 * or Pre-Authentication 5059 */ 5060 if (proto != sdata->control_port_protocol && 5061 proto != cpu_to_be16(ETH_P_PREAUTH)) 5062 return -EINVAL; 5063 5064 if (unencrypted) 5065 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 5066 else 5067 flags = 0; 5068 5069 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5070 sizeof(struct ethhdr) + len); 5071 if (!skb) 5072 return -ENOMEM; 5073 5074 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5075 5076 skb_put_data(skb, buf, len); 5077 5078 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5079 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5080 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5081 ehdr->h_proto = proto; 5082 5083 skb->dev = dev; 5084 skb->protocol = htons(ETH_P_802_3); 5085 skb_reset_network_header(skb); 5086 skb_reset_mac_header(skb); 5087 5088 local_bh_disable(); 5089 __ieee80211_subif_start_xmit(skb, skb->dev, flags, 0); 5090 local_bh_enable(); 5091 5092 return 0; 5093 } 5094 5095 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5096 const u8 *buf, size_t len) 5097 { 5098 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5099 struct ieee80211_local *local = sdata->local; 5100 struct sk_buff *skb; 5101 5102 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5103 30 + /* header size */ 5104 18); /* 11s header size */ 5105 if (!skb) 5106 return -ENOMEM; 5107 5108 skb_reserve(skb, local->hw.extra_tx_headroom); 5109 skb_put_data(skb, buf, len); 5110 5111 skb->dev = dev; 5112 skb->protocol = htons(ETH_P_802_3); 5113 skb_reset_network_header(skb); 5114 skb_reset_mac_header(skb); 5115 5116 local_bh_disable(); 5117 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5118 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP); 5119 local_bh_enable(); 5120 5121 return 0; 5122 } 5123