1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2005, Instant802 Networks, Inc. 4 * Copyright 2005-2006, Devicescape Software, Inc. 5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 6 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> 7 * Copyright 2013-2014 Intel Mobile Communications GmbH 8 * Copyright (C) 2018 Intel Corporation 9 * 10 * Transmit and frame generation functions. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/skbuff.h> 16 #include <linux/if_vlan.h> 17 #include <linux/etherdevice.h> 18 #include <linux/bitmap.h> 19 #include <linux/rcupdate.h> 20 #include <linux/export.h> 21 #include <net/net_namespace.h> 22 #include <net/ieee80211_radiotap.h> 23 #include <net/cfg80211.h> 24 #include <net/mac80211.h> 25 #include <net/codel.h> 26 #include <net/codel_impl.h> 27 #include <asm/unaligned.h> 28 #include <net/fq_impl.h> 29 30 #include "ieee80211_i.h" 31 #include "driver-ops.h" 32 #include "led.h" 33 #include "mesh.h" 34 #include "wep.h" 35 #include "wpa.h" 36 #include "wme.h" 37 #include "rate.h" 38 39 /* misc utils */ 40 41 static inline void ieee80211_tx_stats(struct net_device *dev, u32 len) 42 { 43 struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); 44 45 u64_stats_update_begin(&tstats->syncp); 46 tstats->tx_packets++; 47 tstats->tx_bytes += len; 48 u64_stats_update_end(&tstats->syncp); 49 } 50 51 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 52 struct sk_buff *skb, int group_addr, 53 int next_frag_len) 54 { 55 int rate, mrate, erp, dur, i, shift = 0; 56 struct ieee80211_rate *txrate; 57 struct ieee80211_local *local = tx->local; 58 struct ieee80211_supported_band *sband; 59 struct ieee80211_hdr *hdr; 60 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 61 struct ieee80211_chanctx_conf *chanctx_conf; 62 u32 rate_flags = 0; 63 64 /* assume HW handles this */ 65 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 66 return 0; 67 68 rcu_read_lock(); 69 chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); 70 if (chanctx_conf) { 71 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 72 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 73 } 74 rcu_read_unlock(); 75 76 /* uh huh? */ 77 if (WARN_ON_ONCE(tx->rate.idx < 0)) 78 return 0; 79 80 sband = local->hw.wiphy->bands[info->band]; 81 txrate = &sband->bitrates[tx->rate.idx]; 82 83 erp = txrate->flags & IEEE80211_RATE_ERP_G; 84 85 /* 86 * data and mgmt (except PS Poll): 87 * - during CFP: 32768 88 * - during contention period: 89 * if addr1 is group address: 0 90 * if more fragments = 0 and addr1 is individual address: time to 91 * transmit one ACK plus SIFS 92 * if more fragments = 1 and addr1 is individual address: time to 93 * transmit next fragment plus 2 x ACK plus 3 x SIFS 94 * 95 * IEEE 802.11, 9.6: 96 * - control response frame (CTS or ACK) shall be transmitted using the 97 * same rate as the immediately previous frame in the frame exchange 98 * sequence, if this rate belongs to the PHY mandatory rates, or else 99 * at the highest possible rate belonging to the PHY rates in the 100 * BSSBasicRateSet 101 */ 102 hdr = (struct ieee80211_hdr *)skb->data; 103 if (ieee80211_is_ctl(hdr->frame_control)) { 104 /* TODO: These control frames are not currently sent by 105 * mac80211, but should they be implemented, this function 106 * needs to be updated to support duration field calculation. 107 * 108 * RTS: time needed to transmit pending data/mgmt frame plus 109 * one CTS frame plus one ACK frame plus 3 x SIFS 110 * CTS: duration of immediately previous RTS minus time 111 * required to transmit CTS and its SIFS 112 * ACK: 0 if immediately previous directed data/mgmt had 113 * more=0, with more=1 duration in ACK frame is duration 114 * from previous frame minus time needed to transmit ACK 115 * and its SIFS 116 * PS Poll: BIT(15) | BIT(14) | aid 117 */ 118 return 0; 119 } 120 121 /* data/mgmt */ 122 if (0 /* FIX: data/mgmt during CFP */) 123 return cpu_to_le16(32768); 124 125 if (group_addr) /* Group address as the destination - no ACK */ 126 return 0; 127 128 /* Individual destination address: 129 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 130 * CTS and ACK frames shall be transmitted using the highest rate in 131 * basic rate set that is less than or equal to the rate of the 132 * immediately previous frame and that is using the same modulation 133 * (CCK or OFDM). If no basic rate set matches with these requirements, 134 * the highest mandatory rate of the PHY that is less than or equal to 135 * the rate of the previous frame is used. 136 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 137 */ 138 rate = -1; 139 /* use lowest available if everything fails */ 140 mrate = sband->bitrates[0].bitrate; 141 for (i = 0; i < sband->n_bitrates; i++) { 142 struct ieee80211_rate *r = &sband->bitrates[i]; 143 144 if (r->bitrate > txrate->bitrate) 145 break; 146 147 if ((rate_flags & r->flags) != rate_flags) 148 continue; 149 150 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 151 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 152 153 switch (sband->band) { 154 case NL80211_BAND_2GHZ: { 155 u32 flag; 156 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 157 flag = IEEE80211_RATE_MANDATORY_G; 158 else 159 flag = IEEE80211_RATE_MANDATORY_B; 160 if (r->flags & flag) 161 mrate = r->bitrate; 162 break; 163 } 164 case NL80211_BAND_5GHZ: 165 case NL80211_BAND_6GHZ: 166 if (r->flags & IEEE80211_RATE_MANDATORY_A) 167 mrate = r->bitrate; 168 break; 169 case NL80211_BAND_60GHZ: 170 /* TODO, for now fall through */ 171 case NUM_NL80211_BANDS: 172 WARN_ON(1); 173 break; 174 } 175 } 176 if (rate == -1) { 177 /* No matching basic rate found; use highest suitable mandatory 178 * PHY rate */ 179 rate = DIV_ROUND_UP(mrate, 1 << shift); 180 } 181 182 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 183 if (ieee80211_is_data_qos(hdr->frame_control) && 184 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 185 dur = 0; 186 else 187 /* Time needed to transmit ACK 188 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 189 * to closest integer */ 190 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 191 tx->sdata->vif.bss_conf.use_short_preamble, 192 shift); 193 194 if (next_frag_len) { 195 /* Frame is fragmented: duration increases with time needed to 196 * transmit next fragment plus ACK and 2 x SIFS. */ 197 dur *= 2; /* ACK + SIFS */ 198 /* next fragment */ 199 dur += ieee80211_frame_duration(sband->band, next_frag_len, 200 txrate->bitrate, erp, 201 tx->sdata->vif.bss_conf.use_short_preamble, 202 shift); 203 } 204 205 return cpu_to_le16(dur); 206 } 207 208 /* tx handlers */ 209 static ieee80211_tx_result debug_noinline 210 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 211 { 212 struct ieee80211_local *local = tx->local; 213 struct ieee80211_if_managed *ifmgd; 214 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 215 216 /* driver doesn't support power save */ 217 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 218 return TX_CONTINUE; 219 220 /* hardware does dynamic power save */ 221 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 222 return TX_CONTINUE; 223 224 /* dynamic power save disabled */ 225 if (local->hw.conf.dynamic_ps_timeout <= 0) 226 return TX_CONTINUE; 227 228 /* we are scanning, don't enable power save */ 229 if (local->scanning) 230 return TX_CONTINUE; 231 232 if (!local->ps_sdata) 233 return TX_CONTINUE; 234 235 /* No point if we're going to suspend */ 236 if (local->quiescing) 237 return TX_CONTINUE; 238 239 /* dynamic ps is supported only in managed mode */ 240 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 241 return TX_CONTINUE; 242 243 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 244 return TX_CONTINUE; 245 246 ifmgd = &tx->sdata->u.mgd; 247 248 /* 249 * Don't wakeup from power save if u-apsd is enabled, voip ac has 250 * u-apsd enabled and the frame is in voip class. This effectively 251 * means that even if all access categories have u-apsd enabled, in 252 * practise u-apsd is only used with the voip ac. This is a 253 * workaround for the case when received voip class packets do not 254 * have correct qos tag for some reason, due the network or the 255 * peer application. 256 * 257 * Note: ifmgd->uapsd_queues access is racy here. If the value is 258 * changed via debugfs, user needs to reassociate manually to have 259 * everything in sync. 260 */ 261 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 262 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 263 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 264 return TX_CONTINUE; 265 266 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 267 ieee80211_stop_queues_by_reason(&local->hw, 268 IEEE80211_MAX_QUEUE_MAP, 269 IEEE80211_QUEUE_STOP_REASON_PS, 270 false); 271 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 272 ieee80211_queue_work(&local->hw, 273 &local->dynamic_ps_disable_work); 274 } 275 276 /* Don't restart the timer if we're not disassociated */ 277 if (!ifmgd->associated) 278 return TX_CONTINUE; 279 280 mod_timer(&local->dynamic_ps_timer, jiffies + 281 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 282 283 return TX_CONTINUE; 284 } 285 286 static ieee80211_tx_result debug_noinline 287 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 288 { 289 290 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 291 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 292 bool assoc = false; 293 294 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 295 return TX_CONTINUE; 296 297 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 298 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 299 !ieee80211_is_probe_req(hdr->frame_control) && 300 !ieee80211_is_nullfunc(hdr->frame_control)) 301 /* 302 * When software scanning only nullfunc frames (to notify 303 * the sleep state to the AP) and probe requests (for the 304 * active scan) are allowed, all other frames should not be 305 * sent and we should not get here, but if we do 306 * nonetheless, drop them to avoid sending them 307 * off-channel. See the link below and 308 * ieee80211_start_scan() for more. 309 * 310 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 311 */ 312 return TX_DROP; 313 314 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 315 return TX_CONTINUE; 316 317 if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) 318 return TX_CONTINUE; 319 320 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 321 return TX_CONTINUE; 322 323 if (tx->sta) 324 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 325 326 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 327 if (unlikely(!assoc && 328 ieee80211_is_data(hdr->frame_control))) { 329 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 330 sdata_info(tx->sdata, 331 "dropped data frame to not associated station %pM\n", 332 hdr->addr1); 333 #endif 334 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 335 return TX_DROP; 336 } 337 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 338 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 339 /* 340 * No associated STAs - no need to send multicast 341 * frames. 342 */ 343 return TX_DROP; 344 } 345 346 return TX_CONTINUE; 347 } 348 349 /* This function is called whenever the AP is about to exceed the maximum limit 350 * of buffered frames for power saving STAs. This situation should not really 351 * happen often during normal operation, so dropping the oldest buffered packet 352 * from each queue should be OK to make some room for new frames. */ 353 static void purge_old_ps_buffers(struct ieee80211_local *local) 354 { 355 int total = 0, purged = 0; 356 struct sk_buff *skb; 357 struct ieee80211_sub_if_data *sdata; 358 struct sta_info *sta; 359 360 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 361 struct ps_data *ps; 362 363 if (sdata->vif.type == NL80211_IFTYPE_AP) 364 ps = &sdata->u.ap.ps; 365 else if (ieee80211_vif_is_mesh(&sdata->vif)) 366 ps = &sdata->u.mesh.ps; 367 else 368 continue; 369 370 skb = skb_dequeue(&ps->bc_buf); 371 if (skb) { 372 purged++; 373 ieee80211_free_txskb(&local->hw, skb); 374 } 375 total += skb_queue_len(&ps->bc_buf); 376 } 377 378 /* 379 * Drop one frame from each station from the lowest-priority 380 * AC that has frames at all. 381 */ 382 list_for_each_entry_rcu(sta, &local->sta_list, list) { 383 int ac; 384 385 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 386 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 387 total += skb_queue_len(&sta->ps_tx_buf[ac]); 388 if (skb) { 389 purged++; 390 ieee80211_free_txskb(&local->hw, skb); 391 break; 392 } 393 } 394 } 395 396 local->total_ps_buffered = total; 397 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 398 } 399 400 static ieee80211_tx_result 401 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 402 { 403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 404 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 405 struct ps_data *ps; 406 407 /* 408 * broadcast/multicast frame 409 * 410 * If any of the associated/peer stations is in power save mode, 411 * the frame is buffered to be sent after DTIM beacon frame. 412 * This is done either by the hardware or us. 413 */ 414 415 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 416 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 417 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 418 if (!tx->sdata->bss) 419 return TX_CONTINUE; 420 421 ps = &tx->sdata->bss->ps; 422 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 423 ps = &tx->sdata->u.mesh.ps; 424 } else { 425 return TX_CONTINUE; 426 } 427 428 429 /* no buffering for ordered frames */ 430 if (ieee80211_has_order(hdr->frame_control)) 431 return TX_CONTINUE; 432 433 if (ieee80211_is_probe_req(hdr->frame_control)) 434 return TX_CONTINUE; 435 436 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 437 info->hw_queue = tx->sdata->vif.cab_queue; 438 439 /* no stations in PS mode and no buffered packets */ 440 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 441 return TX_CONTINUE; 442 443 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 444 445 /* device releases frame after DTIM beacon */ 446 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 447 return TX_CONTINUE; 448 449 /* buffered in mac80211 */ 450 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 451 purge_old_ps_buffers(tx->local); 452 453 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 454 ps_dbg(tx->sdata, 455 "BC TX buffer full - dropping the oldest frame\n"); 456 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 457 } else 458 tx->local->total_ps_buffered++; 459 460 skb_queue_tail(&ps->bc_buf, tx->skb); 461 462 return TX_QUEUED; 463 } 464 465 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 466 struct sk_buff *skb) 467 { 468 if (!ieee80211_is_mgmt(fc)) 469 return 0; 470 471 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 472 return 0; 473 474 if (!ieee80211_is_robust_mgmt_frame(skb)) 475 return 0; 476 477 return 1; 478 } 479 480 static ieee80211_tx_result 481 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 482 { 483 struct sta_info *sta = tx->sta; 484 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 485 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 486 struct ieee80211_local *local = tx->local; 487 488 if (unlikely(!sta)) 489 return TX_CONTINUE; 490 491 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 492 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 493 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 494 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 495 int ac = skb_get_queue_mapping(tx->skb); 496 497 if (ieee80211_is_mgmt(hdr->frame_control) && 498 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 499 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 500 return TX_CONTINUE; 501 } 502 503 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 504 sta->sta.addr, sta->sta.aid, ac); 505 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 506 purge_old_ps_buffers(tx->local); 507 508 /* sync with ieee80211_sta_ps_deliver_wakeup */ 509 spin_lock(&sta->ps_lock); 510 /* 511 * STA woke up the meantime and all the frames on ps_tx_buf have 512 * been queued to pending queue. No reordering can happen, go 513 * ahead and Tx the packet. 514 */ 515 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 516 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 517 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 518 spin_unlock(&sta->ps_lock); 519 return TX_CONTINUE; 520 } 521 522 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 523 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 524 ps_dbg(tx->sdata, 525 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 526 sta->sta.addr, ac); 527 ieee80211_free_txskb(&local->hw, old); 528 } else 529 tx->local->total_ps_buffered++; 530 531 info->control.jiffies = jiffies; 532 info->control.vif = &tx->sdata->vif; 533 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 534 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 535 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 536 spin_unlock(&sta->ps_lock); 537 538 if (!timer_pending(&local->sta_cleanup)) 539 mod_timer(&local->sta_cleanup, 540 round_jiffies(jiffies + 541 STA_INFO_CLEANUP_INTERVAL)); 542 543 /* 544 * We queued up some frames, so the TIM bit might 545 * need to be set, recalculate it. 546 */ 547 sta_info_recalc_tim(sta); 548 549 return TX_QUEUED; 550 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 551 ps_dbg(tx->sdata, 552 "STA %pM in PS mode, but polling/in SP -> send frame\n", 553 sta->sta.addr); 554 } 555 556 return TX_CONTINUE; 557 } 558 559 static ieee80211_tx_result debug_noinline 560 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 561 { 562 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 563 return TX_CONTINUE; 564 565 if (tx->flags & IEEE80211_TX_UNICAST) 566 return ieee80211_tx_h_unicast_ps_buf(tx); 567 else 568 return ieee80211_tx_h_multicast_ps_buf(tx); 569 } 570 571 static ieee80211_tx_result debug_noinline 572 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 573 { 574 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 575 576 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 577 if (tx->sdata->control_port_no_encrypt) 578 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 579 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 580 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 581 } 582 583 return TX_CONTINUE; 584 } 585 586 static ieee80211_tx_result debug_noinline 587 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 588 { 589 struct ieee80211_key *key; 590 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 591 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 592 593 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) 594 tx->key = NULL; 595 else if (tx->sta && 596 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 597 tx->key = key; 598 else if (ieee80211_is_group_privacy_action(tx->skb) && 599 (key = rcu_dereference(tx->sdata->default_multicast_key))) 600 tx->key = key; 601 else if (ieee80211_is_mgmt(hdr->frame_control) && 602 is_multicast_ether_addr(hdr->addr1) && 603 ieee80211_is_robust_mgmt_frame(tx->skb) && 604 (key = rcu_dereference(tx->sdata->default_mgmt_key))) 605 tx->key = key; 606 else if (is_multicast_ether_addr(hdr->addr1) && 607 (key = rcu_dereference(tx->sdata->default_multicast_key))) 608 tx->key = key; 609 else if (!is_multicast_ether_addr(hdr->addr1) && 610 (key = rcu_dereference(tx->sdata->default_unicast_key))) 611 tx->key = key; 612 else 613 tx->key = NULL; 614 615 if (tx->key) { 616 bool skip_hw = false; 617 618 /* TODO: add threshold stuff again */ 619 620 switch (tx->key->conf.cipher) { 621 case WLAN_CIPHER_SUITE_WEP40: 622 case WLAN_CIPHER_SUITE_WEP104: 623 case WLAN_CIPHER_SUITE_TKIP: 624 if (!ieee80211_is_data_present(hdr->frame_control)) 625 tx->key = NULL; 626 break; 627 case WLAN_CIPHER_SUITE_CCMP: 628 case WLAN_CIPHER_SUITE_CCMP_256: 629 case WLAN_CIPHER_SUITE_GCMP: 630 case WLAN_CIPHER_SUITE_GCMP_256: 631 if (!ieee80211_is_data_present(hdr->frame_control) && 632 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 633 tx->skb) && 634 !ieee80211_is_group_privacy_action(tx->skb)) 635 tx->key = NULL; 636 else 637 skip_hw = (tx->key->conf.flags & 638 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 639 ieee80211_is_mgmt(hdr->frame_control); 640 break; 641 case WLAN_CIPHER_SUITE_AES_CMAC: 642 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 643 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 644 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 645 if (!ieee80211_is_mgmt(hdr->frame_control)) 646 tx->key = NULL; 647 break; 648 } 649 650 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 651 !ieee80211_is_deauth(hdr->frame_control))) 652 return TX_DROP; 653 654 if (!skip_hw && tx->key && 655 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 656 info->control.hw_key = &tx->key->conf; 657 } 658 659 return TX_CONTINUE; 660 } 661 662 static ieee80211_tx_result debug_noinline 663 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) 664 { 665 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 666 struct ieee80211_hdr *hdr = (void *)tx->skb->data; 667 struct ieee80211_supported_band *sband; 668 u32 len; 669 struct ieee80211_tx_rate_control txrc; 670 struct ieee80211_sta_rates *ratetbl = NULL; 671 bool assoc = false; 672 673 memset(&txrc, 0, sizeof(txrc)); 674 675 sband = tx->local->hw.wiphy->bands[info->band]; 676 677 len = min_t(u32, tx->skb->len + FCS_LEN, 678 tx->local->hw.wiphy->frag_threshold); 679 680 /* set up the tx rate control struct we give the RC algo */ 681 txrc.hw = &tx->local->hw; 682 txrc.sband = sband; 683 txrc.bss_conf = &tx->sdata->vif.bss_conf; 684 txrc.skb = tx->skb; 685 txrc.reported_rate.idx = -1; 686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 687 688 if (tx->sdata->rc_has_mcs_mask[info->band]) 689 txrc.rate_idx_mcs_mask = 690 tx->sdata->rc_rateidx_mcs_mask[info->band]; 691 692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 695 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 696 697 /* set up RTS protection if desired */ 698 if (len > tx->local->hw.wiphy->rts_threshold) { 699 txrc.rts = true; 700 } 701 702 info->control.use_rts = txrc.rts; 703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 704 705 /* 706 * Use short preamble if the BSS can handle it, but not for 707 * management frames unless we know the receiver can handle 708 * that -- the management frame might be to a station that 709 * just wants a probe response. 710 */ 711 if (tx->sdata->vif.bss_conf.use_short_preamble && 712 (ieee80211_is_data(hdr->frame_control) || 713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 714 txrc.short_preamble = true; 715 716 info->control.short_preamble = txrc.short_preamble; 717 718 /* don't ask rate control when rate already injected via radiotap */ 719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 720 return TX_CONTINUE; 721 722 if (tx->sta) 723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 724 725 /* 726 * Lets not bother rate control if we're associated and cannot 727 * talk to the sta. This should not happen. 728 */ 729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 730 !rate_usable_index_exists(sband, &tx->sta->sta), 731 "%s: Dropped data frame as no usable bitrate found while " 732 "scanning and associated. Target station: " 733 "%pM on %d GHz band\n", 734 tx->sdata->name, hdr->addr1, 735 info->band ? 5 : 2)) 736 return TX_DROP; 737 738 /* 739 * If we're associated with the sta at this point we know we can at 740 * least send the frame at the lowest bit rate. 741 */ 742 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 743 744 if (tx->sta && !info->control.skip_table) 745 ratetbl = rcu_dereference(tx->sta->sta.rates); 746 747 if (unlikely(info->control.rates[0].idx < 0)) { 748 if (ratetbl) { 749 struct ieee80211_tx_rate rate = { 750 .idx = ratetbl->rate[0].idx, 751 .flags = ratetbl->rate[0].flags, 752 .count = ratetbl->rate[0].count 753 }; 754 755 if (ratetbl->rate[0].idx < 0) 756 return TX_DROP; 757 758 tx->rate = rate; 759 } else { 760 return TX_DROP; 761 } 762 } else { 763 tx->rate = info->control.rates[0]; 764 } 765 766 if (txrc.reported_rate.idx < 0) { 767 txrc.reported_rate = tx->rate; 768 if (tx->sta && ieee80211_is_data(hdr->frame_control)) 769 tx->sta->tx_stats.last_rate = txrc.reported_rate; 770 } else if (tx->sta) 771 tx->sta->tx_stats.last_rate = txrc.reported_rate; 772 773 if (ratetbl) 774 return TX_CONTINUE; 775 776 if (unlikely(!info->control.rates[0].count)) 777 info->control.rates[0].count = 1; 778 779 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 780 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 781 info->control.rates[0].count = 1; 782 783 return TX_CONTINUE; 784 } 785 786 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 787 { 788 u16 *seq = &sta->tid_seq[tid]; 789 __le16 ret = cpu_to_le16(*seq); 790 791 /* Increase the sequence number. */ 792 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 793 794 return ret; 795 } 796 797 static ieee80211_tx_result debug_noinline 798 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 799 { 800 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 801 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 802 int tid; 803 804 /* 805 * Packet injection may want to control the sequence 806 * number, if we have no matching interface then we 807 * neither assign one ourselves nor ask the driver to. 808 */ 809 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 810 return TX_CONTINUE; 811 812 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 813 return TX_CONTINUE; 814 815 if (ieee80211_hdrlen(hdr->frame_control) < 24) 816 return TX_CONTINUE; 817 818 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 819 return TX_CONTINUE; 820 821 /* 822 * Anything but QoS data that has a sequence number field 823 * (is long enough) gets a sequence number from the global 824 * counter. QoS data frames with a multicast destination 825 * also use the global counter (802.11-2012 9.3.2.10). 826 */ 827 if (!ieee80211_is_data_qos(hdr->frame_control) || 828 is_multicast_ether_addr(hdr->addr1)) { 829 if (tx->flags & IEEE80211_TX_NO_SEQNO) 830 return TX_CONTINUE; 831 /* driver should assign sequence number */ 832 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 833 /* for pure STA mode without beacons, we can do it */ 834 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 835 tx->sdata->sequence_number += 0x10; 836 if (tx->sta) 837 tx->sta->tx_stats.msdu[IEEE80211_NUM_TIDS]++; 838 return TX_CONTINUE; 839 } 840 841 /* 842 * This should be true for injected/management frames only, for 843 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 844 * above since they are not QoS-data frames. 845 */ 846 if (!tx->sta) 847 return TX_CONTINUE; 848 849 /* include per-STA, per-TID sequence counter */ 850 tid = ieee80211_get_tid(hdr); 851 tx->sta->tx_stats.msdu[tid]++; 852 853 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 854 855 return TX_CONTINUE; 856 } 857 858 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 859 struct sk_buff *skb, int hdrlen, 860 int frag_threshold) 861 { 862 struct ieee80211_local *local = tx->local; 863 struct ieee80211_tx_info *info; 864 struct sk_buff *tmp; 865 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 866 int pos = hdrlen + per_fragm; 867 int rem = skb->len - hdrlen - per_fragm; 868 869 if (WARN_ON(rem < 0)) 870 return -EINVAL; 871 872 /* first fragment was already added to queue by caller */ 873 874 while (rem) { 875 int fraglen = per_fragm; 876 877 if (fraglen > rem) 878 fraglen = rem; 879 rem -= fraglen; 880 tmp = dev_alloc_skb(local->tx_headroom + 881 frag_threshold + 882 tx->sdata->encrypt_headroom + 883 IEEE80211_ENCRYPT_TAILROOM); 884 if (!tmp) 885 return -ENOMEM; 886 887 __skb_queue_tail(&tx->skbs, tmp); 888 889 skb_reserve(tmp, 890 local->tx_headroom + tx->sdata->encrypt_headroom); 891 892 /* copy control information */ 893 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 894 895 info = IEEE80211_SKB_CB(tmp); 896 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 897 IEEE80211_TX_CTL_FIRST_FRAGMENT); 898 899 if (rem) 900 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 901 902 skb_copy_queue_mapping(tmp, skb); 903 tmp->priority = skb->priority; 904 tmp->dev = skb->dev; 905 906 /* copy header and data */ 907 skb_put_data(tmp, skb->data, hdrlen); 908 skb_put_data(tmp, skb->data + pos, fraglen); 909 910 pos += fraglen; 911 } 912 913 /* adjust first fragment's length */ 914 skb_trim(skb, hdrlen + per_fragm); 915 return 0; 916 } 917 918 static ieee80211_tx_result debug_noinline 919 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 920 { 921 struct sk_buff *skb = tx->skb; 922 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 923 struct ieee80211_hdr *hdr = (void *)skb->data; 924 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 925 int hdrlen; 926 int fragnum; 927 928 /* no matter what happens, tx->skb moves to tx->skbs */ 929 __skb_queue_tail(&tx->skbs, skb); 930 tx->skb = NULL; 931 932 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 933 return TX_CONTINUE; 934 935 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 936 return TX_CONTINUE; 937 938 /* 939 * Warn when submitting a fragmented A-MPDU frame and drop it. 940 * This scenario is handled in ieee80211_tx_prepare but extra 941 * caution taken here as fragmented ampdu may cause Tx stop. 942 */ 943 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 944 return TX_DROP; 945 946 hdrlen = ieee80211_hdrlen(hdr->frame_control); 947 948 /* internal error, why isn't DONTFRAG set? */ 949 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 950 return TX_DROP; 951 952 /* 953 * Now fragment the frame. This will allocate all the fragments and 954 * chain them (using skb as the first fragment) to skb->next. 955 * During transmission, we will remove the successfully transmitted 956 * fragments from this list. When the low-level driver rejects one 957 * of the fragments then we will simply pretend to accept the skb 958 * but store it away as pending. 959 */ 960 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 961 return TX_DROP; 962 963 /* update duration/seq/flags of fragments */ 964 fragnum = 0; 965 966 skb_queue_walk(&tx->skbs, skb) { 967 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 968 969 hdr = (void *)skb->data; 970 info = IEEE80211_SKB_CB(skb); 971 972 if (!skb_queue_is_last(&tx->skbs, skb)) { 973 hdr->frame_control |= morefrags; 974 /* 975 * No multi-rate retries for fragmented frames, that 976 * would completely throw off the NAV at other STAs. 977 */ 978 info->control.rates[1].idx = -1; 979 info->control.rates[2].idx = -1; 980 info->control.rates[3].idx = -1; 981 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 982 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 983 } else { 984 hdr->frame_control &= ~morefrags; 985 } 986 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 987 fragnum++; 988 } 989 990 return TX_CONTINUE; 991 } 992 993 static ieee80211_tx_result debug_noinline 994 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 995 { 996 struct sk_buff *skb; 997 int ac = -1; 998 999 if (!tx->sta) 1000 return TX_CONTINUE; 1001 1002 skb_queue_walk(&tx->skbs, skb) { 1003 ac = skb_get_queue_mapping(skb); 1004 tx->sta->tx_stats.bytes[ac] += skb->len; 1005 } 1006 if (ac >= 0) 1007 tx->sta->tx_stats.packets[ac]++; 1008 1009 return TX_CONTINUE; 1010 } 1011 1012 static ieee80211_tx_result debug_noinline 1013 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1014 { 1015 if (!tx->key) 1016 return TX_CONTINUE; 1017 1018 switch (tx->key->conf.cipher) { 1019 case WLAN_CIPHER_SUITE_WEP40: 1020 case WLAN_CIPHER_SUITE_WEP104: 1021 return ieee80211_crypto_wep_encrypt(tx); 1022 case WLAN_CIPHER_SUITE_TKIP: 1023 return ieee80211_crypto_tkip_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_CCMP: 1025 return ieee80211_crypto_ccmp_encrypt( 1026 tx, IEEE80211_CCMP_MIC_LEN); 1027 case WLAN_CIPHER_SUITE_CCMP_256: 1028 return ieee80211_crypto_ccmp_encrypt( 1029 tx, IEEE80211_CCMP_256_MIC_LEN); 1030 case WLAN_CIPHER_SUITE_AES_CMAC: 1031 return ieee80211_crypto_aes_cmac_encrypt(tx); 1032 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1033 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1035 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1036 return ieee80211_crypto_aes_gmac_encrypt(tx); 1037 case WLAN_CIPHER_SUITE_GCMP: 1038 case WLAN_CIPHER_SUITE_GCMP_256: 1039 return ieee80211_crypto_gcmp_encrypt(tx); 1040 default: 1041 return ieee80211_crypto_hw_encrypt(tx); 1042 } 1043 1044 return TX_DROP; 1045 } 1046 1047 static ieee80211_tx_result debug_noinline 1048 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1049 { 1050 struct sk_buff *skb; 1051 struct ieee80211_hdr *hdr; 1052 int next_len; 1053 bool group_addr; 1054 1055 skb_queue_walk(&tx->skbs, skb) { 1056 hdr = (void *) skb->data; 1057 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1058 break; /* must not overwrite AID */ 1059 if (!skb_queue_is_last(&tx->skbs, skb)) { 1060 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1061 next_len = next->len; 1062 } else 1063 next_len = 0; 1064 group_addr = is_multicast_ether_addr(hdr->addr1); 1065 1066 hdr->duration_id = 1067 ieee80211_duration(tx, skb, group_addr, next_len); 1068 } 1069 1070 return TX_CONTINUE; 1071 } 1072 1073 /* actual transmit path */ 1074 1075 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1076 struct sk_buff *skb, 1077 struct ieee80211_tx_info *info, 1078 struct tid_ampdu_tx *tid_tx, 1079 int tid) 1080 { 1081 bool queued = false; 1082 bool reset_agg_timer = false; 1083 struct sk_buff *purge_skb = NULL; 1084 1085 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1086 info->flags |= IEEE80211_TX_CTL_AMPDU; 1087 reset_agg_timer = true; 1088 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1089 /* 1090 * nothing -- this aggregation session is being started 1091 * but that might still fail with the driver 1092 */ 1093 } else if (!tx->sta->sta.txq[tid]) { 1094 spin_lock(&tx->sta->lock); 1095 /* 1096 * Need to re-check now, because we may get here 1097 * 1098 * 1) in the window during which the setup is actually 1099 * already done, but not marked yet because not all 1100 * packets are spliced over to the driver pending 1101 * queue yet -- if this happened we acquire the lock 1102 * either before or after the splice happens, but 1103 * need to recheck which of these cases happened. 1104 * 1105 * 2) during session teardown, if the OPERATIONAL bit 1106 * was cleared due to the teardown but the pointer 1107 * hasn't been assigned NULL yet (or we loaded it 1108 * before it was assigned) -- in this case it may 1109 * now be NULL which means we should just let the 1110 * packet pass through because splicing the frames 1111 * back is already done. 1112 */ 1113 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1114 1115 if (!tid_tx) { 1116 /* do nothing, let packet pass through */ 1117 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1118 info->flags |= IEEE80211_TX_CTL_AMPDU; 1119 reset_agg_timer = true; 1120 } else { 1121 queued = true; 1122 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1123 clear_sta_flag(tx->sta, WLAN_STA_SP); 1124 ps_dbg(tx->sta->sdata, 1125 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1126 tx->sta->sta.addr, tx->sta->sta.aid); 1127 } 1128 info->control.vif = &tx->sdata->vif; 1129 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1130 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1131 __skb_queue_tail(&tid_tx->pending, skb); 1132 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1133 purge_skb = __skb_dequeue(&tid_tx->pending); 1134 } 1135 spin_unlock(&tx->sta->lock); 1136 1137 if (purge_skb) 1138 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1139 } 1140 1141 /* reset session timer */ 1142 if (reset_agg_timer) 1143 tid_tx->last_tx = jiffies; 1144 1145 return queued; 1146 } 1147 1148 /* 1149 * initialises @tx 1150 * pass %NULL for the station if unknown, a valid pointer if known 1151 * or an ERR_PTR() if the station is known not to exist 1152 */ 1153 static ieee80211_tx_result 1154 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1155 struct ieee80211_tx_data *tx, 1156 struct sta_info *sta, struct sk_buff *skb) 1157 { 1158 struct ieee80211_local *local = sdata->local; 1159 struct ieee80211_hdr *hdr; 1160 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1161 int tid; 1162 1163 memset(tx, 0, sizeof(*tx)); 1164 tx->skb = skb; 1165 tx->local = local; 1166 tx->sdata = sdata; 1167 __skb_queue_head_init(&tx->skbs); 1168 1169 /* 1170 * If this flag is set to true anywhere, and we get here, 1171 * we are doing the needed processing, so remove the flag 1172 * now. 1173 */ 1174 info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; 1175 1176 hdr = (struct ieee80211_hdr *) skb->data; 1177 1178 if (likely(sta)) { 1179 if (!IS_ERR(sta)) 1180 tx->sta = sta; 1181 } else { 1182 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1183 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1184 if (!tx->sta && sdata->wdev.use_4addr) 1185 return TX_DROP; 1186 } else if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | 1187 IEEE80211_TX_CTL_INJECTED) || 1188 tx->sdata->control_port_protocol == tx->skb->protocol) { 1189 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1190 } 1191 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) 1192 tx->sta = sta_info_get(sdata, hdr->addr1); 1193 } 1194 1195 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1196 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1197 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1198 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1199 struct tid_ampdu_tx *tid_tx; 1200 1201 tid = ieee80211_get_tid(hdr); 1202 1203 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1204 if (tid_tx) { 1205 bool queued; 1206 1207 queued = ieee80211_tx_prep_agg(tx, skb, info, 1208 tid_tx, tid); 1209 1210 if (unlikely(queued)) 1211 return TX_QUEUED; 1212 } 1213 } 1214 1215 if (is_multicast_ether_addr(hdr->addr1)) { 1216 tx->flags &= ~IEEE80211_TX_UNICAST; 1217 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1218 } else 1219 tx->flags |= IEEE80211_TX_UNICAST; 1220 1221 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1222 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1223 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1224 info->flags & IEEE80211_TX_CTL_AMPDU) 1225 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1226 } 1227 1228 if (!tx->sta) 1229 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1230 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1231 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1232 ieee80211_check_fast_xmit(tx->sta); 1233 } 1234 1235 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1236 1237 return TX_CONTINUE; 1238 } 1239 1240 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1241 struct ieee80211_vif *vif, 1242 struct sta_info *sta, 1243 struct sk_buff *skb) 1244 { 1245 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1246 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1247 struct ieee80211_txq *txq = NULL; 1248 1249 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1250 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1251 return NULL; 1252 1253 if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1254 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1255 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1256 vif->type == NL80211_IFTYPE_STATION) && 1257 sta && sta->uploaded) { 1258 /* 1259 * This will be NULL if the driver didn't set the 1260 * opt-in hardware flag. 1261 */ 1262 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1263 } 1264 } else if (sta) { 1265 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1266 1267 if (!sta->uploaded) 1268 return NULL; 1269 1270 txq = sta->sta.txq[tid]; 1271 } else if (vif) { 1272 txq = vif->txq; 1273 } 1274 1275 if (!txq) 1276 return NULL; 1277 1278 return to_txq_info(txq); 1279 } 1280 1281 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1282 { 1283 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1284 } 1285 1286 static u32 codel_skb_len_func(const struct sk_buff *skb) 1287 { 1288 return skb->len; 1289 } 1290 1291 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1292 { 1293 const struct ieee80211_tx_info *info; 1294 1295 info = (const struct ieee80211_tx_info *)skb->cb; 1296 return info->control.enqueue_time; 1297 } 1298 1299 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1300 void *ctx) 1301 { 1302 struct ieee80211_local *local; 1303 struct txq_info *txqi; 1304 struct fq *fq; 1305 struct fq_flow *flow; 1306 1307 txqi = ctx; 1308 local = vif_to_sdata(txqi->txq.vif)->local; 1309 fq = &local->fq; 1310 1311 if (cvars == &txqi->def_cvars) 1312 flow = &txqi->def_flow; 1313 else 1314 flow = &fq->flows[cvars - local->cvars]; 1315 1316 return fq_flow_dequeue(fq, flow); 1317 } 1318 1319 static void codel_drop_func(struct sk_buff *skb, 1320 void *ctx) 1321 { 1322 struct ieee80211_local *local; 1323 struct ieee80211_hw *hw; 1324 struct txq_info *txqi; 1325 1326 txqi = ctx; 1327 local = vif_to_sdata(txqi->txq.vif)->local; 1328 hw = &local->hw; 1329 1330 ieee80211_free_txskb(hw, skb); 1331 } 1332 1333 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1334 struct fq_tin *tin, 1335 struct fq_flow *flow) 1336 { 1337 struct ieee80211_local *local; 1338 struct txq_info *txqi; 1339 struct codel_vars *cvars; 1340 struct codel_params *cparams; 1341 struct codel_stats *cstats; 1342 1343 local = container_of(fq, struct ieee80211_local, fq); 1344 txqi = container_of(tin, struct txq_info, tin); 1345 cstats = &txqi->cstats; 1346 1347 if (txqi->txq.sta) { 1348 struct sta_info *sta = container_of(txqi->txq.sta, 1349 struct sta_info, sta); 1350 cparams = &sta->cparams; 1351 } else { 1352 cparams = &local->cparams; 1353 } 1354 1355 if (flow == &txqi->def_flow) 1356 cvars = &txqi->def_cvars; 1357 else 1358 cvars = &local->cvars[flow - fq->flows]; 1359 1360 return codel_dequeue(txqi, 1361 &flow->backlog, 1362 cparams, 1363 cvars, 1364 cstats, 1365 codel_skb_len_func, 1366 codel_skb_time_func, 1367 codel_drop_func, 1368 codel_dequeue_func); 1369 } 1370 1371 static void fq_skb_free_func(struct fq *fq, 1372 struct fq_tin *tin, 1373 struct fq_flow *flow, 1374 struct sk_buff *skb) 1375 { 1376 struct ieee80211_local *local; 1377 1378 local = container_of(fq, struct ieee80211_local, fq); 1379 ieee80211_free_txskb(&local->hw, skb); 1380 } 1381 1382 static struct fq_flow *fq_flow_get_default_func(struct fq *fq, 1383 struct fq_tin *tin, 1384 int idx, 1385 struct sk_buff *skb) 1386 { 1387 struct txq_info *txqi; 1388 1389 txqi = container_of(tin, struct txq_info, tin); 1390 return &txqi->def_flow; 1391 } 1392 1393 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1394 struct txq_info *txqi, 1395 struct sk_buff *skb) 1396 { 1397 struct fq *fq = &local->fq; 1398 struct fq_tin *tin = &txqi->tin; 1399 u32 flow_idx = fq_flow_idx(fq, skb); 1400 1401 ieee80211_set_skb_enqueue_time(skb); 1402 1403 spin_lock_bh(&fq->lock); 1404 fq_tin_enqueue(fq, tin, flow_idx, skb, 1405 fq_skb_free_func, 1406 fq_flow_get_default_func); 1407 spin_unlock_bh(&fq->lock); 1408 } 1409 1410 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1411 struct fq_flow *flow, struct sk_buff *skb, 1412 void *data) 1413 { 1414 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1415 1416 return info->control.vif == data; 1417 } 1418 1419 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1420 struct ieee80211_sub_if_data *sdata) 1421 { 1422 struct fq *fq = &local->fq; 1423 struct txq_info *txqi; 1424 struct fq_tin *tin; 1425 struct ieee80211_sub_if_data *ap; 1426 1427 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1428 return; 1429 1430 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1431 1432 if (!ap->vif.txq) 1433 return; 1434 1435 txqi = to_txq_info(ap->vif.txq); 1436 tin = &txqi->tin; 1437 1438 spin_lock_bh(&fq->lock); 1439 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1440 fq_skb_free_func); 1441 spin_unlock_bh(&fq->lock); 1442 } 1443 1444 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1445 struct sta_info *sta, 1446 struct txq_info *txqi, int tid) 1447 { 1448 fq_tin_init(&txqi->tin); 1449 fq_flow_init(&txqi->def_flow); 1450 codel_vars_init(&txqi->def_cvars); 1451 codel_stats_init(&txqi->cstats); 1452 __skb_queue_head_init(&txqi->frags); 1453 INIT_LIST_HEAD(&txqi->schedule_order); 1454 1455 txqi->txq.vif = &sdata->vif; 1456 1457 if (!sta) { 1458 sdata->vif.txq = &txqi->txq; 1459 txqi->txq.tid = 0; 1460 txqi->txq.ac = IEEE80211_AC_BE; 1461 1462 return; 1463 } 1464 1465 if (tid == IEEE80211_NUM_TIDS) { 1466 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1467 /* Drivers need to opt in to the management MPDU TXQ */ 1468 if (!ieee80211_hw_check(&sdata->local->hw, 1469 STA_MMPDU_TXQ)) 1470 return; 1471 } else if (!ieee80211_hw_check(&sdata->local->hw, 1472 BUFF_MMPDU_TXQ)) { 1473 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1474 return; 1475 } 1476 txqi->txq.ac = IEEE80211_AC_VO; 1477 } else { 1478 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1479 } 1480 1481 txqi->txq.sta = &sta->sta; 1482 txqi->txq.tid = tid; 1483 sta->sta.txq[tid] = &txqi->txq; 1484 } 1485 1486 void ieee80211_txq_purge(struct ieee80211_local *local, 1487 struct txq_info *txqi) 1488 { 1489 struct fq *fq = &local->fq; 1490 struct fq_tin *tin = &txqi->tin; 1491 1492 spin_lock_bh(&fq->lock); 1493 fq_tin_reset(fq, tin, fq_skb_free_func); 1494 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1495 spin_unlock_bh(&fq->lock); 1496 1497 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1498 list_del_init(&txqi->schedule_order); 1499 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1500 } 1501 1502 void ieee80211_txq_set_params(struct ieee80211_local *local) 1503 { 1504 if (local->hw.wiphy->txq_limit) 1505 local->fq.limit = local->hw.wiphy->txq_limit; 1506 else 1507 local->hw.wiphy->txq_limit = local->fq.limit; 1508 1509 if (local->hw.wiphy->txq_memory_limit) 1510 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1511 else 1512 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1513 1514 if (local->hw.wiphy->txq_quantum) 1515 local->fq.quantum = local->hw.wiphy->txq_quantum; 1516 else 1517 local->hw.wiphy->txq_quantum = local->fq.quantum; 1518 } 1519 1520 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1521 { 1522 struct fq *fq = &local->fq; 1523 int ret; 1524 int i; 1525 bool supp_vht = false; 1526 enum nl80211_band band; 1527 1528 if (!local->ops->wake_tx_queue) 1529 return 0; 1530 1531 ret = fq_init(fq, 4096); 1532 if (ret) 1533 return ret; 1534 1535 /* 1536 * If the hardware doesn't support VHT, it is safe to limit the maximum 1537 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1538 */ 1539 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1540 struct ieee80211_supported_band *sband; 1541 1542 sband = local->hw.wiphy->bands[band]; 1543 if (!sband) 1544 continue; 1545 1546 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1547 } 1548 1549 if (!supp_vht) 1550 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1551 1552 codel_params_init(&local->cparams); 1553 local->cparams.interval = MS2TIME(100); 1554 local->cparams.target = MS2TIME(20); 1555 local->cparams.ecn = true; 1556 1557 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1558 GFP_KERNEL); 1559 if (!local->cvars) { 1560 spin_lock_bh(&fq->lock); 1561 fq_reset(fq, fq_skb_free_func); 1562 spin_unlock_bh(&fq->lock); 1563 return -ENOMEM; 1564 } 1565 1566 for (i = 0; i < fq->flows_cnt; i++) 1567 codel_vars_init(&local->cvars[i]); 1568 1569 ieee80211_txq_set_params(local); 1570 1571 return 0; 1572 } 1573 1574 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1575 { 1576 struct fq *fq = &local->fq; 1577 1578 if (!local->ops->wake_tx_queue) 1579 return; 1580 1581 kfree(local->cvars); 1582 local->cvars = NULL; 1583 1584 spin_lock_bh(&fq->lock); 1585 fq_reset(fq, fq_skb_free_func); 1586 spin_unlock_bh(&fq->lock); 1587 } 1588 1589 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1590 struct ieee80211_sub_if_data *sdata, 1591 struct sta_info *sta, 1592 struct sk_buff *skb) 1593 { 1594 struct ieee80211_vif *vif; 1595 struct txq_info *txqi; 1596 1597 if (!local->ops->wake_tx_queue || 1598 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1599 return false; 1600 1601 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1602 sdata = container_of(sdata->bss, 1603 struct ieee80211_sub_if_data, u.ap); 1604 1605 vif = &sdata->vif; 1606 txqi = ieee80211_get_txq(local, vif, sta, skb); 1607 1608 if (!txqi) 1609 return false; 1610 1611 ieee80211_txq_enqueue(local, txqi, skb); 1612 1613 schedule_and_wake_txq(local, txqi); 1614 1615 return true; 1616 } 1617 1618 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1619 struct ieee80211_vif *vif, 1620 struct sta_info *sta, 1621 struct sk_buff_head *skbs, 1622 bool txpending) 1623 { 1624 struct ieee80211_tx_control control = {}; 1625 struct sk_buff *skb, *tmp; 1626 unsigned long flags; 1627 1628 skb_queue_walk_safe(skbs, skb, tmp) { 1629 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1630 int q = info->hw_queue; 1631 1632 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1633 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1634 __skb_unlink(skb, skbs); 1635 ieee80211_free_txskb(&local->hw, skb); 1636 continue; 1637 } 1638 #endif 1639 1640 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1641 if (local->queue_stop_reasons[q] || 1642 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1643 if (unlikely(info->flags & 1644 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1645 if (local->queue_stop_reasons[q] & 1646 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1647 /* 1648 * Drop off-channel frames if queues 1649 * are stopped for any reason other 1650 * than off-channel operation. Never 1651 * queue them. 1652 */ 1653 spin_unlock_irqrestore( 1654 &local->queue_stop_reason_lock, 1655 flags); 1656 ieee80211_purge_tx_queue(&local->hw, 1657 skbs); 1658 return true; 1659 } 1660 } else { 1661 1662 /* 1663 * Since queue is stopped, queue up frames for 1664 * later transmission from the tx-pending 1665 * tasklet when the queue is woken again. 1666 */ 1667 if (txpending) 1668 skb_queue_splice_init(skbs, 1669 &local->pending[q]); 1670 else 1671 skb_queue_splice_tail_init(skbs, 1672 &local->pending[q]); 1673 1674 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1675 flags); 1676 return false; 1677 } 1678 } 1679 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1680 1681 info->control.vif = vif; 1682 control.sta = sta ? &sta->sta : NULL; 1683 1684 __skb_unlink(skb, skbs); 1685 drv_tx(local, &control, skb); 1686 } 1687 1688 return true; 1689 } 1690 1691 /* 1692 * Returns false if the frame couldn't be transmitted but was queued instead. 1693 */ 1694 static bool __ieee80211_tx(struct ieee80211_local *local, 1695 struct sk_buff_head *skbs, int led_len, 1696 struct sta_info *sta, bool txpending) 1697 { 1698 struct ieee80211_tx_info *info; 1699 struct ieee80211_sub_if_data *sdata; 1700 struct ieee80211_vif *vif; 1701 struct sk_buff *skb; 1702 bool result = true; 1703 __le16 fc; 1704 1705 if (WARN_ON(skb_queue_empty(skbs))) 1706 return true; 1707 1708 skb = skb_peek(skbs); 1709 fc = ((struct ieee80211_hdr *)skb->data)->frame_control; 1710 info = IEEE80211_SKB_CB(skb); 1711 sdata = vif_to_sdata(info->control.vif); 1712 if (sta && !sta->uploaded) 1713 sta = NULL; 1714 1715 switch (sdata->vif.type) { 1716 case NL80211_IFTYPE_MONITOR: 1717 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1718 vif = &sdata->vif; 1719 break; 1720 } 1721 sdata = rcu_dereference(local->monitor_sdata); 1722 if (sdata) { 1723 vif = &sdata->vif; 1724 info->hw_queue = 1725 vif->hw_queue[skb_get_queue_mapping(skb)]; 1726 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1727 ieee80211_purge_tx_queue(&local->hw, skbs); 1728 return true; 1729 } else 1730 vif = NULL; 1731 break; 1732 case NL80211_IFTYPE_AP_VLAN: 1733 sdata = container_of(sdata->bss, 1734 struct ieee80211_sub_if_data, u.ap); 1735 /* fall through */ 1736 default: 1737 vif = &sdata->vif; 1738 break; 1739 } 1740 1741 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1742 1743 ieee80211_tpt_led_trig_tx(local, fc, led_len); 1744 1745 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1746 1747 return result; 1748 } 1749 1750 /* 1751 * Invoke TX handlers, return 0 on success and non-zero if the 1752 * frame was dropped or queued. 1753 * 1754 * The handlers are split into an early and late part. The latter is everything 1755 * that can be sensitive to reordering, and will be deferred to after packets 1756 * are dequeued from the intermediate queues (when they are enabled). 1757 */ 1758 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1759 { 1760 ieee80211_tx_result res = TX_DROP; 1761 1762 #define CALL_TXH(txh) \ 1763 do { \ 1764 res = txh(tx); \ 1765 if (res != TX_CONTINUE) \ 1766 goto txh_done; \ 1767 } while (0) 1768 1769 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1770 CALL_TXH(ieee80211_tx_h_check_assoc); 1771 CALL_TXH(ieee80211_tx_h_ps_buf); 1772 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1773 CALL_TXH(ieee80211_tx_h_select_key); 1774 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1775 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1776 1777 txh_done: 1778 if (unlikely(res == TX_DROP)) { 1779 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1780 if (tx->skb) 1781 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1782 else 1783 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1784 return -1; 1785 } else if (unlikely(res == TX_QUEUED)) { 1786 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1787 return -1; 1788 } 1789 1790 return 0; 1791 } 1792 1793 /* 1794 * Late handlers can be called while the sta lock is held. Handlers that can 1795 * cause packets to be generated will cause deadlock! 1796 */ 1797 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1798 { 1799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1800 ieee80211_tx_result res = TX_CONTINUE; 1801 1802 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1803 __skb_queue_tail(&tx->skbs, tx->skb); 1804 tx->skb = NULL; 1805 goto txh_done; 1806 } 1807 1808 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1809 CALL_TXH(ieee80211_tx_h_sequence); 1810 CALL_TXH(ieee80211_tx_h_fragment); 1811 /* handlers after fragment must be aware of tx info fragmentation! */ 1812 CALL_TXH(ieee80211_tx_h_stats); 1813 CALL_TXH(ieee80211_tx_h_encrypt); 1814 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1815 CALL_TXH(ieee80211_tx_h_calculate_duration); 1816 #undef CALL_TXH 1817 1818 txh_done: 1819 if (unlikely(res == TX_DROP)) { 1820 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1821 if (tx->skb) 1822 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1823 else 1824 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1825 return -1; 1826 } else if (unlikely(res == TX_QUEUED)) { 1827 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1828 return -1; 1829 } 1830 1831 return 0; 1832 } 1833 1834 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1835 { 1836 int r = invoke_tx_handlers_early(tx); 1837 1838 if (r) 1839 return r; 1840 return invoke_tx_handlers_late(tx); 1841 } 1842 1843 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1844 struct ieee80211_vif *vif, struct sk_buff *skb, 1845 int band, struct ieee80211_sta **sta) 1846 { 1847 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1848 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1849 struct ieee80211_tx_data tx; 1850 struct sk_buff *skb2; 1851 1852 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1853 return false; 1854 1855 info->band = band; 1856 info->control.vif = vif; 1857 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1858 1859 if (invoke_tx_handlers(&tx)) 1860 return false; 1861 1862 if (sta) { 1863 if (tx.sta) 1864 *sta = &tx.sta->sta; 1865 else 1866 *sta = NULL; 1867 } 1868 1869 /* this function isn't suitable for fragmented data frames */ 1870 skb2 = __skb_dequeue(&tx.skbs); 1871 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1872 ieee80211_free_txskb(hw, skb2); 1873 ieee80211_purge_tx_queue(hw, &tx.skbs); 1874 return false; 1875 } 1876 1877 return true; 1878 } 1879 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1880 1881 /* 1882 * Returns false if the frame couldn't be transmitted but was queued instead. 1883 */ 1884 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1885 struct sta_info *sta, struct sk_buff *skb, 1886 bool txpending, u32 txdata_flags) 1887 { 1888 struct ieee80211_local *local = sdata->local; 1889 struct ieee80211_tx_data tx; 1890 ieee80211_tx_result res_prepare; 1891 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1892 bool result = true; 1893 int led_len; 1894 1895 if (unlikely(skb->len < 10)) { 1896 dev_kfree_skb(skb); 1897 return true; 1898 } 1899 1900 /* initialises tx */ 1901 led_len = skb->len; 1902 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1903 1904 tx.flags |= txdata_flags; 1905 1906 if (unlikely(res_prepare == TX_DROP)) { 1907 ieee80211_free_txskb(&local->hw, skb); 1908 return true; 1909 } else if (unlikely(res_prepare == TX_QUEUED)) { 1910 return true; 1911 } 1912 1913 /* set up hw_queue value early */ 1914 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1915 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1916 info->hw_queue = 1917 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1918 1919 if (invoke_tx_handlers_early(&tx)) 1920 return true; 1921 1922 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1923 return true; 1924 1925 if (!invoke_tx_handlers_late(&tx)) 1926 result = __ieee80211_tx(local, &tx.skbs, led_len, 1927 tx.sta, txpending); 1928 1929 return result; 1930 } 1931 1932 /* device xmit handlers */ 1933 1934 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1935 struct sk_buff *skb, 1936 int head_need, bool may_encrypt) 1937 { 1938 struct ieee80211_local *local = sdata->local; 1939 struct ieee80211_hdr *hdr; 1940 bool enc_tailroom; 1941 int tail_need = 0; 1942 1943 hdr = (struct ieee80211_hdr *) skb->data; 1944 enc_tailroom = may_encrypt && 1945 (sdata->crypto_tx_tailroom_needed_cnt || 1946 ieee80211_is_mgmt(hdr->frame_control)); 1947 1948 if (enc_tailroom) { 1949 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1950 tail_need -= skb_tailroom(skb); 1951 tail_need = max_t(int, tail_need, 0); 1952 } 1953 1954 if (skb_cloned(skb) && 1955 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1956 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1957 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1958 else if (head_need || tail_need) 1959 I802_DEBUG_INC(local->tx_expand_skb_head); 1960 else 1961 return 0; 1962 1963 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1964 wiphy_debug(local->hw.wiphy, 1965 "failed to reallocate TX buffer\n"); 1966 return -ENOMEM; 1967 } 1968 1969 return 0; 1970 } 1971 1972 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1973 struct sta_info *sta, struct sk_buff *skb, 1974 u32 txdata_flags) 1975 { 1976 struct ieee80211_local *local = sdata->local; 1977 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1978 struct ieee80211_hdr *hdr; 1979 int headroom; 1980 bool may_encrypt; 1981 1982 may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); 1983 1984 headroom = local->tx_headroom; 1985 if (may_encrypt) 1986 headroom += sdata->encrypt_headroom; 1987 headroom -= skb_headroom(skb); 1988 headroom = max_t(int, 0, headroom); 1989 1990 if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { 1991 ieee80211_free_txskb(&local->hw, skb); 1992 return; 1993 } 1994 1995 hdr = (struct ieee80211_hdr *) skb->data; 1996 info->control.vif = &sdata->vif; 1997 1998 if (ieee80211_vif_is_mesh(&sdata->vif)) { 1999 if (ieee80211_is_data(hdr->frame_control) && 2000 is_unicast_ether_addr(hdr->addr1)) { 2001 if (mesh_nexthop_resolve(sdata, skb)) 2002 return; /* skb queued: don't free */ 2003 } else { 2004 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2005 } 2006 } 2007 2008 ieee80211_set_qos_hdr(sdata, skb); 2009 ieee80211_tx(sdata, sta, skb, false, txdata_flags); 2010 } 2011 2012 static bool ieee80211_parse_tx_radiotap(struct ieee80211_local *local, 2013 struct sk_buff *skb) 2014 { 2015 struct ieee80211_radiotap_iterator iterator; 2016 struct ieee80211_radiotap_header *rthdr = 2017 (struct ieee80211_radiotap_header *) skb->data; 2018 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2019 struct ieee80211_supported_band *sband = 2020 local->hw.wiphy->bands[info->band]; 2021 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2022 NULL); 2023 u16 txflags; 2024 u16 rate = 0; 2025 bool rate_found = false; 2026 u8 rate_retries = 0; 2027 u16 rate_flags = 0; 2028 u8 mcs_known, mcs_flags, mcs_bw; 2029 u16 vht_known; 2030 u8 vht_mcs = 0, vht_nss = 0; 2031 int i; 2032 2033 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2034 IEEE80211_TX_CTL_DONTFRAG; 2035 2036 /* 2037 * for every radiotap entry that is present 2038 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2039 * entries present, or -EINVAL on error) 2040 */ 2041 2042 while (!ret) { 2043 ret = ieee80211_radiotap_iterator_next(&iterator); 2044 2045 if (ret) 2046 continue; 2047 2048 /* see if this argument is something we can use */ 2049 switch (iterator.this_arg_index) { 2050 /* 2051 * You must take care when dereferencing iterator.this_arg 2052 * for multibyte types... the pointer is not aligned. Use 2053 * get_unaligned((type *)iterator.this_arg) to dereference 2054 * iterator.this_arg for type "type" safely on all arches. 2055 */ 2056 case IEEE80211_RADIOTAP_FLAGS: 2057 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2058 /* 2059 * this indicates that the skb we have been 2060 * handed has the 32-bit FCS CRC at the end... 2061 * we should react to that by snipping it off 2062 * because it will be recomputed and added 2063 * on transmission 2064 */ 2065 if (skb->len < (iterator._max_length + FCS_LEN)) 2066 return false; 2067 2068 skb_trim(skb, skb->len - FCS_LEN); 2069 } 2070 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2071 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2072 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2073 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2074 break; 2075 2076 case IEEE80211_RADIOTAP_TX_FLAGS: 2077 txflags = get_unaligned_le16(iterator.this_arg); 2078 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2079 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2080 break; 2081 2082 case IEEE80211_RADIOTAP_RATE: 2083 rate = *iterator.this_arg; 2084 rate_flags = 0; 2085 rate_found = true; 2086 break; 2087 2088 case IEEE80211_RADIOTAP_DATA_RETRIES: 2089 rate_retries = *iterator.this_arg; 2090 break; 2091 2092 case IEEE80211_RADIOTAP_MCS: 2093 mcs_known = iterator.this_arg[0]; 2094 mcs_flags = iterator.this_arg[1]; 2095 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2096 break; 2097 2098 rate_found = true; 2099 rate = iterator.this_arg[2]; 2100 rate_flags = IEEE80211_TX_RC_MCS; 2101 2102 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2103 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2104 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2105 2106 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2107 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2108 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2109 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2110 break; 2111 2112 case IEEE80211_RADIOTAP_VHT: 2113 vht_known = get_unaligned_le16(iterator.this_arg); 2114 rate_found = true; 2115 2116 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2117 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2118 (iterator.this_arg[2] & 2119 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2120 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2121 if (vht_known & 2122 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2123 if (iterator.this_arg[3] == 1) 2124 rate_flags |= 2125 IEEE80211_TX_RC_40_MHZ_WIDTH; 2126 else if (iterator.this_arg[3] == 4) 2127 rate_flags |= 2128 IEEE80211_TX_RC_80_MHZ_WIDTH; 2129 else if (iterator.this_arg[3] == 11) 2130 rate_flags |= 2131 IEEE80211_TX_RC_160_MHZ_WIDTH; 2132 } 2133 2134 vht_mcs = iterator.this_arg[4] >> 4; 2135 vht_nss = iterator.this_arg[4] & 0xF; 2136 break; 2137 2138 /* 2139 * Please update the file 2140 * Documentation/networking/mac80211-injection.txt 2141 * when parsing new fields here. 2142 */ 2143 2144 default: 2145 break; 2146 } 2147 } 2148 2149 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2150 return false; 2151 2152 if (rate_found) { 2153 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2154 2155 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2156 info->control.rates[i].idx = -1; 2157 info->control.rates[i].flags = 0; 2158 info->control.rates[i].count = 0; 2159 } 2160 2161 if (rate_flags & IEEE80211_TX_RC_MCS) { 2162 info->control.rates[0].idx = rate; 2163 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2164 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2165 vht_nss); 2166 } else { 2167 for (i = 0; i < sband->n_bitrates; i++) { 2168 if (rate * 5 != sband->bitrates[i].bitrate) 2169 continue; 2170 2171 info->control.rates[0].idx = i; 2172 break; 2173 } 2174 } 2175 2176 if (info->control.rates[0].idx < 0) 2177 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2178 2179 info->control.rates[0].flags = rate_flags; 2180 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2181 local->hw.max_rate_tries); 2182 } 2183 2184 /* 2185 * remove the radiotap header 2186 * iterator->_max_length was sanity-checked against 2187 * skb->len by iterator init 2188 */ 2189 skb_pull(skb, iterator._max_length); 2190 2191 return true; 2192 } 2193 2194 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2195 struct net_device *dev) 2196 { 2197 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2198 struct ieee80211_chanctx_conf *chanctx_conf; 2199 struct ieee80211_radiotap_header *prthdr = 2200 (struct ieee80211_radiotap_header *)skb->data; 2201 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2202 struct ieee80211_hdr *hdr; 2203 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2204 struct cfg80211_chan_def *chandef; 2205 u16 len_rthdr; 2206 int hdrlen; 2207 2208 /* check for not even having the fixed radiotap header part */ 2209 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2210 goto fail; /* too short to be possibly valid */ 2211 2212 /* is it a header version we can trust to find length from? */ 2213 if (unlikely(prthdr->it_version)) 2214 goto fail; /* only version 0 is supported */ 2215 2216 /* then there must be a radiotap header with a length we can use */ 2217 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2218 2219 /* does the skb contain enough to deliver on the alleged length? */ 2220 if (unlikely(skb->len < len_rthdr)) 2221 goto fail; /* skb too short for claimed rt header extent */ 2222 2223 /* 2224 * fix up the pointers accounting for the radiotap 2225 * header still being in there. We are being given 2226 * a precooked IEEE80211 header so no need for 2227 * normal processing 2228 */ 2229 skb_set_mac_header(skb, len_rthdr); 2230 /* 2231 * these are just fixed to the end of the rt area since we 2232 * don't have any better information and at this point, nobody cares 2233 */ 2234 skb_set_network_header(skb, len_rthdr); 2235 skb_set_transport_header(skb, len_rthdr); 2236 2237 if (skb->len < len_rthdr + 2) 2238 goto fail; 2239 2240 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2241 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2242 2243 if (skb->len < len_rthdr + hdrlen) 2244 goto fail; 2245 2246 /* 2247 * Initialize skb->protocol if the injected frame is a data frame 2248 * carrying a rfc1042 header 2249 */ 2250 if (ieee80211_is_data(hdr->frame_control) && 2251 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2252 u8 *payload = (u8 *)hdr + hdrlen; 2253 2254 if (ether_addr_equal(payload, rfc1042_header)) 2255 skb->protocol = cpu_to_be16((payload[6] << 8) | 2256 payload[7]); 2257 } 2258 2259 memset(info, 0, sizeof(*info)); 2260 2261 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2262 IEEE80211_TX_CTL_INJECTED; 2263 2264 rcu_read_lock(); 2265 2266 /* 2267 * We process outgoing injected frames that have a local address 2268 * we handle as though they are non-injected frames. 2269 * This code here isn't entirely correct, the local MAC address 2270 * isn't always enough to find the interface to use; for proper 2271 * VLAN/WDS support we will need a different mechanism (which 2272 * likely isn't going to be monitor interfaces). 2273 */ 2274 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2275 2276 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2277 if (!ieee80211_sdata_running(tmp_sdata)) 2278 continue; 2279 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2280 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 2281 tmp_sdata->vif.type == NL80211_IFTYPE_WDS) 2282 continue; 2283 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2284 sdata = tmp_sdata; 2285 break; 2286 } 2287 } 2288 2289 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2290 if (!chanctx_conf) { 2291 tmp_sdata = rcu_dereference(local->monitor_sdata); 2292 if (tmp_sdata) 2293 chanctx_conf = 2294 rcu_dereference(tmp_sdata->vif.chanctx_conf); 2295 } 2296 2297 if (chanctx_conf) 2298 chandef = &chanctx_conf->def; 2299 else if (!local->use_chanctx) 2300 chandef = &local->_oper_chandef; 2301 else 2302 goto fail_rcu; 2303 2304 /* 2305 * Frame injection is not allowed if beaconing is not allowed 2306 * or if we need radar detection. Beaconing is usually not allowed when 2307 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2308 * Passive scan is also used in world regulatory domains where 2309 * your country is not known and as such it should be treated as 2310 * NO TX unless the channel is explicitly allowed in which case 2311 * your current regulatory domain would not have the passive scan 2312 * flag. 2313 * 2314 * Since AP mode uses monitor interfaces to inject/TX management 2315 * frames we can make AP mode the exception to this rule once it 2316 * supports radar detection as its implementation can deal with 2317 * radar detection by itself. We can do that later by adding a 2318 * monitor flag interfaces used for AP support. 2319 */ 2320 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2321 sdata->vif.type)) 2322 goto fail_rcu; 2323 2324 info->band = chandef->chan->band; 2325 2326 /* process and remove the injection radiotap header */ 2327 if (!ieee80211_parse_tx_radiotap(local, skb)) 2328 goto fail_rcu; 2329 2330 ieee80211_xmit(sdata, NULL, skb, 0); 2331 rcu_read_unlock(); 2332 2333 return NETDEV_TX_OK; 2334 2335 fail_rcu: 2336 rcu_read_unlock(); 2337 fail: 2338 dev_kfree_skb(skb); 2339 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2340 } 2341 2342 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2343 { 2344 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2345 2346 return ethertype == ETH_P_TDLS && 2347 skb->len > 14 && 2348 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2349 } 2350 2351 static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2352 struct sk_buff *skb, 2353 struct sta_info **sta_out) 2354 { 2355 struct sta_info *sta; 2356 2357 switch (sdata->vif.type) { 2358 case NL80211_IFTYPE_AP_VLAN: 2359 sta = rcu_dereference(sdata->u.vlan.sta); 2360 if (sta) { 2361 *sta_out = sta; 2362 return 0; 2363 } else if (sdata->wdev.use_4addr) { 2364 return -ENOLINK; 2365 } 2366 /* fall through */ 2367 case NL80211_IFTYPE_AP: 2368 case NL80211_IFTYPE_OCB: 2369 case NL80211_IFTYPE_ADHOC: 2370 if (is_multicast_ether_addr(skb->data)) { 2371 *sta_out = ERR_PTR(-ENOENT); 2372 return 0; 2373 } 2374 sta = sta_info_get_bss(sdata, skb->data); 2375 break; 2376 case NL80211_IFTYPE_WDS: 2377 sta = sta_info_get(sdata, sdata->u.wds.remote_addr); 2378 break; 2379 #ifdef CONFIG_MAC80211_MESH 2380 case NL80211_IFTYPE_MESH_POINT: 2381 /* determined much later */ 2382 *sta_out = NULL; 2383 return 0; 2384 #endif 2385 case NL80211_IFTYPE_STATION: 2386 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2387 sta = sta_info_get(sdata, skb->data); 2388 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2389 if (test_sta_flag(sta, 2390 WLAN_STA_TDLS_PEER_AUTH)) { 2391 *sta_out = sta; 2392 return 0; 2393 } 2394 2395 /* 2396 * TDLS link during setup - throw out frames to 2397 * peer. Allow TDLS-setup frames to unauthorized 2398 * peers for the special case of a link teardown 2399 * after a TDLS sta is removed due to being 2400 * unreachable. 2401 */ 2402 if (!ieee80211_is_tdls_setup(skb)) 2403 return -EINVAL; 2404 } 2405 2406 } 2407 2408 sta = sta_info_get(sdata, sdata->u.mgd.bssid); 2409 if (!sta) 2410 return -ENOLINK; 2411 break; 2412 default: 2413 return -EINVAL; 2414 } 2415 2416 *sta_out = sta ?: ERR_PTR(-ENOENT); 2417 return 0; 2418 } 2419 2420 static int ieee80211_store_ack_skb(struct ieee80211_local *local, 2421 struct sk_buff *skb, 2422 u32 *info_flags) 2423 { 2424 struct sk_buff *ack_skb = skb_clone_sk(skb); 2425 u16 info_id = 0; 2426 2427 if (ack_skb) { 2428 unsigned long flags; 2429 int id; 2430 2431 spin_lock_irqsave(&local->ack_status_lock, flags); 2432 id = idr_alloc(&local->ack_status_frames, ack_skb, 2433 1, 0x40, GFP_ATOMIC); 2434 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2435 2436 if (id >= 0) { 2437 info_id = id; 2438 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2439 } else { 2440 kfree_skb(ack_skb); 2441 } 2442 } 2443 2444 return info_id; 2445 } 2446 2447 /** 2448 * ieee80211_build_hdr - build 802.11 header in the given frame 2449 * @sdata: virtual interface to build the header for 2450 * @skb: the skb to build the header in 2451 * @info_flags: skb flags to set 2452 * @ctrl_flags: info control flags to set 2453 * 2454 * This function takes the skb with 802.3 header and reformats the header to 2455 * the appropriate IEEE 802.11 header based on which interface the packet is 2456 * being transmitted on. 2457 * 2458 * Note that this function also takes care of the TX status request and 2459 * potential unsharing of the SKB - this needs to be interleaved with the 2460 * header building. 2461 * 2462 * The function requires the read-side RCU lock held 2463 * 2464 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2465 */ 2466 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2467 struct sk_buff *skb, u32 info_flags, 2468 struct sta_info *sta, u32 ctrl_flags) 2469 { 2470 struct ieee80211_local *local = sdata->local; 2471 struct ieee80211_tx_info *info; 2472 int head_need; 2473 u16 ethertype, hdrlen, meshhdrlen = 0; 2474 __le16 fc; 2475 struct ieee80211_hdr hdr; 2476 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2477 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2478 const u8 *encaps_data; 2479 int encaps_len, skip_header_bytes; 2480 bool wme_sta = false, authorized = false; 2481 bool tdls_peer; 2482 bool multicast; 2483 u16 info_id = 0; 2484 struct ieee80211_chanctx_conf *chanctx_conf; 2485 struct ieee80211_sub_if_data *ap_sdata; 2486 enum nl80211_band band; 2487 int ret; 2488 2489 if (IS_ERR(sta)) 2490 sta = NULL; 2491 2492 #ifdef CONFIG_MAC80211_DEBUGFS 2493 if (local->force_tx_status) 2494 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2495 #endif 2496 2497 /* convert Ethernet header to proper 802.11 header (based on 2498 * operation mode) */ 2499 ethertype = (skb->data[12] << 8) | skb->data[13]; 2500 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2501 2502 switch (sdata->vif.type) { 2503 case NL80211_IFTYPE_AP_VLAN: 2504 if (sdata->wdev.use_4addr) { 2505 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2506 /* RA TA DA SA */ 2507 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2508 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2509 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2510 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2511 hdrlen = 30; 2512 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2513 wme_sta = sta->sta.wme; 2514 } 2515 ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, 2516 u.ap); 2517 chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); 2518 if (!chanctx_conf) { 2519 ret = -ENOTCONN; 2520 goto free; 2521 } 2522 band = chanctx_conf->def.chan->band; 2523 if (sdata->wdev.use_4addr) 2524 break; 2525 /* fall through */ 2526 case NL80211_IFTYPE_AP: 2527 if (sdata->vif.type == NL80211_IFTYPE_AP) 2528 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2529 if (!chanctx_conf) { 2530 ret = -ENOTCONN; 2531 goto free; 2532 } 2533 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2534 /* DA BSSID SA */ 2535 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2536 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2537 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2538 hdrlen = 24; 2539 band = chanctx_conf->def.chan->band; 2540 break; 2541 case NL80211_IFTYPE_WDS: 2542 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2543 /* RA TA DA SA */ 2544 memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); 2545 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2546 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2547 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2548 hdrlen = 30; 2549 /* 2550 * This is the exception! WDS style interfaces are prohibited 2551 * when channel contexts are in used so this must be valid 2552 */ 2553 band = local->hw.conf.chandef.chan->band; 2554 break; 2555 #ifdef CONFIG_MAC80211_MESH 2556 case NL80211_IFTYPE_MESH_POINT: 2557 if (!is_multicast_ether_addr(skb->data)) { 2558 struct sta_info *next_hop; 2559 bool mpp_lookup = true; 2560 2561 mpath = mesh_path_lookup(sdata, skb->data); 2562 if (mpath) { 2563 mpp_lookup = false; 2564 next_hop = rcu_dereference(mpath->next_hop); 2565 if (!next_hop || 2566 !(mpath->flags & (MESH_PATH_ACTIVE | 2567 MESH_PATH_RESOLVING))) 2568 mpp_lookup = true; 2569 } 2570 2571 if (mpp_lookup) { 2572 mppath = mpp_path_lookup(sdata, skb->data); 2573 if (mppath) 2574 mppath->exp_time = jiffies; 2575 } 2576 2577 if (mppath && mpath) 2578 mesh_path_del(sdata, mpath->dst); 2579 } 2580 2581 /* 2582 * Use address extension if it is a packet from 2583 * another interface or if we know the destination 2584 * is being proxied by a portal (i.e. portal address 2585 * differs from proxied address) 2586 */ 2587 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2588 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2589 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2590 skb->data, skb->data + ETH_ALEN); 2591 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2592 NULL, NULL); 2593 } else { 2594 /* DS -> MBSS (802.11-2012 13.11.3.3). 2595 * For unicast with unknown forwarding information, 2596 * destination might be in the MBSS or if that fails 2597 * forwarded to another mesh gate. In either case 2598 * resolution will be handled in ieee80211_xmit(), so 2599 * leave the original DA. This also works for mcast */ 2600 const u8 *mesh_da = skb->data; 2601 2602 if (mppath) 2603 mesh_da = mppath->mpp; 2604 else if (mpath) 2605 mesh_da = mpath->dst; 2606 2607 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2608 mesh_da, sdata->vif.addr); 2609 if (is_multicast_ether_addr(mesh_da)) 2610 /* DA TA mSA AE:SA */ 2611 meshhdrlen = ieee80211_new_mesh_header( 2612 sdata, &mesh_hdr, 2613 skb->data + ETH_ALEN, NULL); 2614 else 2615 /* RA TA mDA mSA AE:DA SA */ 2616 meshhdrlen = ieee80211_new_mesh_header( 2617 sdata, &mesh_hdr, skb->data, 2618 skb->data + ETH_ALEN); 2619 2620 } 2621 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2622 if (!chanctx_conf) { 2623 ret = -ENOTCONN; 2624 goto free; 2625 } 2626 band = chanctx_conf->def.chan->band; 2627 2628 /* For injected frames, fill RA right away as nexthop lookup 2629 * will be skipped. 2630 */ 2631 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2632 is_zero_ether_addr(hdr.addr1)) 2633 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2634 break; 2635 #endif 2636 case NL80211_IFTYPE_STATION: 2637 /* we already did checks when looking up the RA STA */ 2638 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2639 2640 if (tdls_peer) { 2641 /* DA SA BSSID */ 2642 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2643 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2644 memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); 2645 hdrlen = 24; 2646 } else if (sdata->u.mgd.use_4addr && 2647 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2648 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2649 IEEE80211_FCTL_TODS); 2650 /* RA TA DA SA */ 2651 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2652 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2653 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2654 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2655 hdrlen = 30; 2656 } else { 2657 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2658 /* BSSID SA DA */ 2659 memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); 2660 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2661 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2662 hdrlen = 24; 2663 } 2664 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2665 if (!chanctx_conf) { 2666 ret = -ENOTCONN; 2667 goto free; 2668 } 2669 band = chanctx_conf->def.chan->band; 2670 break; 2671 case NL80211_IFTYPE_OCB: 2672 /* DA SA BSSID */ 2673 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2674 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2675 eth_broadcast_addr(hdr.addr3); 2676 hdrlen = 24; 2677 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2678 if (!chanctx_conf) { 2679 ret = -ENOTCONN; 2680 goto free; 2681 } 2682 band = chanctx_conf->def.chan->band; 2683 break; 2684 case NL80211_IFTYPE_ADHOC: 2685 /* DA SA BSSID */ 2686 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2687 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2688 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2689 hdrlen = 24; 2690 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2691 if (!chanctx_conf) { 2692 ret = -ENOTCONN; 2693 goto free; 2694 } 2695 band = chanctx_conf->def.chan->band; 2696 break; 2697 default: 2698 ret = -EINVAL; 2699 goto free; 2700 } 2701 2702 multicast = is_multicast_ether_addr(hdr.addr1); 2703 2704 /* sta is always NULL for mesh */ 2705 if (sta) { 2706 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2707 wme_sta = sta->sta.wme; 2708 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2709 /* For mesh, the use of the QoS header is mandatory */ 2710 wme_sta = true; 2711 } 2712 2713 /* receiver does QoS (which also means we do) use it */ 2714 if (wme_sta) { 2715 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2716 hdrlen += 2; 2717 } 2718 2719 /* 2720 * Drop unicast frames to unauthorised stations unless they are 2721 * EAPOL frames from the local station. 2722 */ 2723 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2724 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2725 !multicast && !authorized && 2726 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2727 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2728 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2729 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2730 sdata->name, hdr.addr1); 2731 #endif 2732 2733 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2734 2735 ret = -EPERM; 2736 goto free; 2737 } 2738 2739 if (unlikely(!multicast && skb->sk && 2740 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 2741 info_id = ieee80211_store_ack_skb(local, skb, &info_flags); 2742 2743 /* 2744 * If the skb is shared we need to obtain our own copy. 2745 */ 2746 if (skb_shared(skb)) { 2747 struct sk_buff *tmp_skb = skb; 2748 2749 /* can't happen -- skb is a clone if info_id != 0 */ 2750 WARN_ON(info_id); 2751 2752 skb = skb_clone(skb, GFP_ATOMIC); 2753 kfree_skb(tmp_skb); 2754 2755 if (!skb) { 2756 ret = -ENOMEM; 2757 goto free; 2758 } 2759 } 2760 2761 hdr.frame_control = fc; 2762 hdr.duration_id = 0; 2763 hdr.seq_ctrl = 0; 2764 2765 skip_header_bytes = ETH_HLEN; 2766 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2767 encaps_data = bridge_tunnel_header; 2768 encaps_len = sizeof(bridge_tunnel_header); 2769 skip_header_bytes -= 2; 2770 } else if (ethertype >= ETH_P_802_3_MIN) { 2771 encaps_data = rfc1042_header; 2772 encaps_len = sizeof(rfc1042_header); 2773 skip_header_bytes -= 2; 2774 } else { 2775 encaps_data = NULL; 2776 encaps_len = 0; 2777 } 2778 2779 skb_pull(skb, skip_header_bytes); 2780 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2781 2782 /* 2783 * So we need to modify the skb header and hence need a copy of 2784 * that. The head_need variable above doesn't, so far, include 2785 * the needed header space that we don't need right away. If we 2786 * can, then we don't reallocate right now but only after the 2787 * frame arrives at the master device (if it does...) 2788 * 2789 * If we cannot, however, then we will reallocate to include all 2790 * the ever needed space. Also, if we need to reallocate it anyway, 2791 * make it big enough for everything we may ever need. 2792 */ 2793 2794 if (head_need > 0 || skb_cloned(skb)) { 2795 head_need += sdata->encrypt_headroom; 2796 head_need += local->tx_headroom; 2797 head_need = max_t(int, 0, head_need); 2798 if (ieee80211_skb_resize(sdata, skb, head_need, true)) { 2799 ieee80211_free_txskb(&local->hw, skb); 2800 skb = NULL; 2801 return ERR_PTR(-ENOMEM); 2802 } 2803 } 2804 2805 if (encaps_data) 2806 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2807 2808 #ifdef CONFIG_MAC80211_MESH 2809 if (meshhdrlen > 0) 2810 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2811 #endif 2812 2813 if (ieee80211_is_data_qos(fc)) { 2814 __le16 *qos_control; 2815 2816 qos_control = skb_push(skb, 2); 2817 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2818 /* 2819 * Maybe we could actually set some fields here, for now just 2820 * initialise to zero to indicate no special operation. 2821 */ 2822 *qos_control = 0; 2823 } else 2824 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2825 2826 skb_reset_mac_header(skb); 2827 2828 info = IEEE80211_SKB_CB(skb); 2829 memset(info, 0, sizeof(*info)); 2830 2831 info->flags = info_flags; 2832 info->ack_frame_id = info_id; 2833 info->band = band; 2834 info->control.flags = ctrl_flags; 2835 2836 return skb; 2837 free: 2838 kfree_skb(skb); 2839 return ERR_PTR(ret); 2840 } 2841 2842 /* 2843 * fast-xmit overview 2844 * 2845 * The core idea of this fast-xmit is to remove per-packet checks by checking 2846 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2847 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2848 * much less work can be done per packet. For example, fragmentation must be 2849 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2850 * in the code here. 2851 * 2852 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2853 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2854 * 2855 * The most difficult part of this is that when any of these assumptions 2856 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2857 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2858 * since the per-packet code no longer checks the conditions. This is reflected 2859 * by the calls to these functions throughout the rest of the code, and must be 2860 * maintained if any of the TX path checks change. 2861 */ 2862 2863 void ieee80211_check_fast_xmit(struct sta_info *sta) 2864 { 2865 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2866 struct ieee80211_local *local = sta->local; 2867 struct ieee80211_sub_if_data *sdata = sta->sdata; 2868 struct ieee80211_hdr *hdr = (void *)build.hdr; 2869 struct ieee80211_chanctx_conf *chanctx_conf; 2870 __le16 fc; 2871 2872 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2873 return; 2874 2875 /* Locking here protects both the pointer itself, and against concurrent 2876 * invocations winning data access races to, e.g., the key pointer that 2877 * is used. 2878 * Without it, the invocation of this function right after the key 2879 * pointer changes wouldn't be sufficient, as another CPU could access 2880 * the pointer, then stall, and then do the cache update after the CPU 2881 * that invalidated the key. 2882 * With the locking, such scenarios cannot happen as the check for the 2883 * key and the fast-tx assignment are done atomically, so the CPU that 2884 * modifies the key will either wait or other one will see the key 2885 * cleared/changed already. 2886 */ 2887 spin_lock_bh(&sta->lock); 2888 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2889 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2890 sdata->vif.type == NL80211_IFTYPE_STATION) 2891 goto out; 2892 2893 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2894 goto out; 2895 2896 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2897 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2898 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2899 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2900 goto out; 2901 2902 if (sdata->noack_map) 2903 goto out; 2904 2905 /* fast-xmit doesn't handle fragmentation at all */ 2906 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2907 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2908 goto out; 2909 2910 rcu_read_lock(); 2911 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 2912 if (!chanctx_conf) { 2913 rcu_read_unlock(); 2914 goto out; 2915 } 2916 build.band = chanctx_conf->def.chan->band; 2917 rcu_read_unlock(); 2918 2919 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2920 2921 switch (sdata->vif.type) { 2922 case NL80211_IFTYPE_ADHOC: 2923 /* DA SA BSSID */ 2924 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2925 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2926 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2927 build.hdr_len = 24; 2928 break; 2929 case NL80211_IFTYPE_STATION: 2930 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2931 /* DA SA BSSID */ 2932 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2933 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2934 memcpy(hdr->addr3, sdata->u.mgd.bssid, ETH_ALEN); 2935 build.hdr_len = 24; 2936 break; 2937 } 2938 2939 if (sdata->u.mgd.use_4addr) { 2940 /* non-regular ethertype cannot use the fastpath */ 2941 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2942 IEEE80211_FCTL_TODS); 2943 /* RA TA DA SA */ 2944 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2945 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2946 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2947 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2948 build.hdr_len = 30; 2949 break; 2950 } 2951 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2952 /* BSSID SA DA */ 2953 memcpy(hdr->addr1, sdata->u.mgd.bssid, ETH_ALEN); 2954 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2955 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2956 build.hdr_len = 24; 2957 break; 2958 case NL80211_IFTYPE_AP_VLAN: 2959 if (sdata->wdev.use_4addr) { 2960 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2961 IEEE80211_FCTL_TODS); 2962 /* RA TA DA SA */ 2963 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 2964 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2965 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 2966 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 2967 build.hdr_len = 30; 2968 break; 2969 } 2970 /* fall through */ 2971 case NL80211_IFTYPE_AP: 2972 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2973 /* DA BSSID SA */ 2974 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2975 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 2976 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 2977 build.hdr_len = 24; 2978 break; 2979 default: 2980 /* not handled on fast-xmit */ 2981 goto out; 2982 } 2983 2984 if (sta->sta.wme) { 2985 build.hdr_len += 2; 2986 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2987 } 2988 2989 /* We store the key here so there's no point in using rcu_dereference() 2990 * but that's fine because the code that changes the pointers will call 2991 * this function after doing so. For a single CPU that would be enough, 2992 * for multiple see the comment above. 2993 */ 2994 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 2995 if (!build.key) 2996 build.key = rcu_access_pointer(sdata->default_unicast_key); 2997 if (build.key) { 2998 bool gen_iv, iv_spc, mmic; 2999 3000 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3001 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3002 mmic = build.key->conf.flags & 3003 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3004 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3005 3006 /* don't handle software crypto */ 3007 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3008 goto out; 3009 3010 /* Key is being removed */ 3011 if (build.key->flags & KEY_FLAG_TAINTED) 3012 goto out; 3013 3014 switch (build.key->conf.cipher) { 3015 case WLAN_CIPHER_SUITE_CCMP: 3016 case WLAN_CIPHER_SUITE_CCMP_256: 3017 if (gen_iv) 3018 build.pn_offs = build.hdr_len; 3019 if (gen_iv || iv_spc) 3020 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3021 break; 3022 case WLAN_CIPHER_SUITE_GCMP: 3023 case WLAN_CIPHER_SUITE_GCMP_256: 3024 if (gen_iv) 3025 build.pn_offs = build.hdr_len; 3026 if (gen_iv || iv_spc) 3027 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3028 break; 3029 case WLAN_CIPHER_SUITE_TKIP: 3030 /* cannot handle MMIC or IV generation in xmit-fast */ 3031 if (mmic || gen_iv) 3032 goto out; 3033 if (iv_spc) 3034 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3035 break; 3036 case WLAN_CIPHER_SUITE_WEP40: 3037 case WLAN_CIPHER_SUITE_WEP104: 3038 /* cannot handle IV generation in fast-xmit */ 3039 if (gen_iv) 3040 goto out; 3041 if (iv_spc) 3042 build.hdr_len += IEEE80211_WEP_IV_LEN; 3043 break; 3044 case WLAN_CIPHER_SUITE_AES_CMAC: 3045 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3046 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3047 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3048 WARN(1, 3049 "management cipher suite 0x%x enabled for data\n", 3050 build.key->conf.cipher); 3051 goto out; 3052 default: 3053 /* we don't know how to generate IVs for this at all */ 3054 if (WARN_ON(gen_iv)) 3055 goto out; 3056 /* pure hardware keys are OK, of course */ 3057 if (!(build.key->flags & KEY_FLAG_CIPHER_SCHEME)) 3058 break; 3059 /* cipher scheme might require space allocation */ 3060 if (iv_spc && 3061 build.key->conf.iv_len > IEEE80211_FAST_XMIT_MAX_IV) 3062 goto out; 3063 if (iv_spc) 3064 build.hdr_len += build.key->conf.iv_len; 3065 } 3066 3067 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3068 } 3069 3070 hdr->frame_control = fc; 3071 3072 memcpy(build.hdr + build.hdr_len, 3073 rfc1042_header, sizeof(rfc1042_header)); 3074 build.hdr_len += sizeof(rfc1042_header); 3075 3076 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3077 /* if the kmemdup fails, continue w/o fast_tx */ 3078 if (!fast_tx) 3079 goto out; 3080 3081 out: 3082 /* we might have raced against another call to this function */ 3083 old = rcu_dereference_protected(sta->fast_tx, 3084 lockdep_is_held(&sta->lock)); 3085 rcu_assign_pointer(sta->fast_tx, fast_tx); 3086 if (old) 3087 kfree_rcu(old, rcu_head); 3088 spin_unlock_bh(&sta->lock); 3089 } 3090 3091 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3092 { 3093 struct sta_info *sta; 3094 3095 rcu_read_lock(); 3096 list_for_each_entry_rcu(sta, &local->sta_list, list) 3097 ieee80211_check_fast_xmit(sta); 3098 rcu_read_unlock(); 3099 } 3100 3101 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3102 { 3103 struct ieee80211_local *local = sdata->local; 3104 struct sta_info *sta; 3105 3106 rcu_read_lock(); 3107 3108 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3109 if (sdata != sta->sdata && 3110 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3111 continue; 3112 ieee80211_check_fast_xmit(sta); 3113 } 3114 3115 rcu_read_unlock(); 3116 } 3117 3118 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3119 { 3120 struct ieee80211_fast_tx *fast_tx; 3121 3122 spin_lock_bh(&sta->lock); 3123 fast_tx = rcu_dereference_protected(sta->fast_tx, 3124 lockdep_is_held(&sta->lock)); 3125 RCU_INIT_POINTER(sta->fast_tx, NULL); 3126 spin_unlock_bh(&sta->lock); 3127 3128 if (fast_tx) 3129 kfree_rcu(fast_tx, rcu_head); 3130 } 3131 3132 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3133 struct sk_buff *skb, int headroom) 3134 { 3135 if (skb_headroom(skb) < headroom) { 3136 I802_DEBUG_INC(local->tx_expand_skb_head); 3137 3138 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3139 wiphy_debug(local->hw.wiphy, 3140 "failed to reallocate TX buffer\n"); 3141 return false; 3142 } 3143 } 3144 3145 return true; 3146 } 3147 3148 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3149 struct ieee80211_fast_tx *fast_tx, 3150 struct sk_buff *skb) 3151 { 3152 struct ieee80211_local *local = sdata->local; 3153 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3154 struct ieee80211_hdr *hdr; 3155 struct ethhdr *amsdu_hdr; 3156 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3157 int subframe_len = skb->len - hdr_len; 3158 void *data; 3159 u8 *qc, *h_80211_src, *h_80211_dst; 3160 const u8 *bssid; 3161 3162 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3163 return false; 3164 3165 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3166 return true; 3167 3168 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr))) 3169 return false; 3170 3171 data = skb_push(skb, sizeof(*amsdu_hdr)); 3172 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3173 hdr = data; 3174 amsdu_hdr = data + hdr_len; 3175 /* h_80211_src/dst is addr* field within hdr */ 3176 h_80211_src = data + fast_tx->sa_offs; 3177 h_80211_dst = data + fast_tx->da_offs; 3178 3179 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3180 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3181 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3182 3183 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3184 * fields needs to be changed to BSSID for A-MSDU frames depending 3185 * on FromDS/ToDS values. 3186 */ 3187 switch (sdata->vif.type) { 3188 case NL80211_IFTYPE_STATION: 3189 bssid = sdata->u.mgd.bssid; 3190 break; 3191 case NL80211_IFTYPE_AP: 3192 case NL80211_IFTYPE_AP_VLAN: 3193 bssid = sdata->vif.addr; 3194 break; 3195 default: 3196 bssid = NULL; 3197 } 3198 3199 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3200 ether_addr_copy(h_80211_src, bssid); 3201 3202 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3203 ether_addr_copy(h_80211_dst, bssid); 3204 3205 qc = ieee80211_get_qos_ctl(hdr); 3206 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3207 3208 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3209 3210 return true; 3211 } 3212 3213 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3214 struct sta_info *sta, 3215 struct ieee80211_fast_tx *fast_tx, 3216 struct sk_buff *skb) 3217 { 3218 struct ieee80211_local *local = sdata->local; 3219 struct fq *fq = &local->fq; 3220 struct fq_tin *tin; 3221 struct fq_flow *flow; 3222 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3223 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3224 struct txq_info *txqi; 3225 struct sk_buff **frag_tail, *head; 3226 int subframe_len = skb->len - ETH_ALEN; 3227 u8 max_subframes = sta->sta.max_amsdu_subframes; 3228 int max_frags = local->hw.max_tx_fragments; 3229 int max_amsdu_len = sta->sta.max_amsdu_len; 3230 int orig_truesize; 3231 u32 flow_idx; 3232 __be16 len; 3233 void *data; 3234 bool ret = false; 3235 unsigned int orig_len; 3236 int n = 2, nfrags, pad = 0; 3237 u16 hdrlen; 3238 3239 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3240 return false; 3241 3242 if (skb_is_gso(skb)) 3243 return false; 3244 3245 if (!txq) 3246 return false; 3247 3248 txqi = to_txq_info(txq); 3249 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3250 return false; 3251 3252 if (sta->sta.max_rc_amsdu_len) 3253 max_amsdu_len = min_t(int, max_amsdu_len, 3254 sta->sta.max_rc_amsdu_len); 3255 3256 if (sta->sta.max_tid_amsdu_len[tid]) 3257 max_amsdu_len = min_t(int, max_amsdu_len, 3258 sta->sta.max_tid_amsdu_len[tid]); 3259 3260 flow_idx = fq_flow_idx(fq, skb); 3261 3262 spin_lock_bh(&fq->lock); 3263 3264 /* TODO: Ideally aggregation should be done on dequeue to remain 3265 * responsive to environment changes. 3266 */ 3267 3268 tin = &txqi->tin; 3269 flow = fq_flow_classify(fq, tin, flow_idx, skb, 3270 fq_flow_get_default_func); 3271 head = skb_peek_tail(&flow->queue); 3272 if (!head || skb_is_gso(head)) 3273 goto out; 3274 3275 orig_truesize = head->truesize; 3276 orig_len = head->len; 3277 3278 if (skb->len + head->len > max_amsdu_len) 3279 goto out; 3280 3281 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3282 nfrags += 1 + skb_shinfo(head)->nr_frags; 3283 frag_tail = &skb_shinfo(head)->frag_list; 3284 while (*frag_tail) { 3285 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3286 frag_tail = &(*frag_tail)->next; 3287 n++; 3288 } 3289 3290 if (max_subframes && n > max_subframes) 3291 goto out; 3292 3293 if (max_frags && nfrags > max_frags) 3294 goto out; 3295 3296 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3297 goto out; 3298 3299 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3300 goto out; 3301 3302 /* 3303 * Pad out the previous subframe to a multiple of 4 by adding the 3304 * padding to the next one, that's being added. Note that head->len 3305 * is the length of the full A-MSDU, but that works since each time 3306 * we add a new subframe we pad out the previous one to a multiple 3307 * of 4 and thus it no longer matters in the next round. 3308 */ 3309 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3310 if ((head->len - hdrlen) & 3) 3311 pad = 4 - ((head->len - hdrlen) & 3); 3312 3313 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3314 2 + pad)) 3315 goto out_recalc; 3316 3317 ret = true; 3318 data = skb_push(skb, ETH_ALEN + 2); 3319 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3320 3321 data += 2 * ETH_ALEN; 3322 len = cpu_to_be16(subframe_len); 3323 memcpy(data, &len, 2); 3324 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3325 3326 memset(skb_push(skb, pad), 0, pad); 3327 3328 head->len += skb->len; 3329 head->data_len += skb->len; 3330 *frag_tail = skb; 3331 3332 out_recalc: 3333 fq->memory_usage += head->truesize - orig_truesize; 3334 if (head->len != orig_len) { 3335 flow->backlog += head->len - orig_len; 3336 tin->backlog_bytes += head->len - orig_len; 3337 3338 fq_recalc_backlog(fq, tin, flow); 3339 } 3340 out: 3341 spin_unlock_bh(&fq->lock); 3342 3343 return ret; 3344 } 3345 3346 /* 3347 * Can be called while the sta lock is held. Anything that can cause packets to 3348 * be generated will cause deadlock! 3349 */ 3350 static void ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3351 struct sta_info *sta, u8 pn_offs, 3352 struct ieee80211_key *key, 3353 struct sk_buff *skb) 3354 { 3355 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3356 struct ieee80211_hdr *hdr = (void *)skb->data; 3357 u8 tid = IEEE80211_NUM_TIDS; 3358 3359 if (key) 3360 info->control.hw_key = &key->conf; 3361 3362 ieee80211_tx_stats(skb->dev, skb->len); 3363 3364 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3365 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3366 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3367 } else { 3368 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3369 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3370 sdata->sequence_number += 0x10; 3371 } 3372 3373 if (skb_shinfo(skb)->gso_size) 3374 sta->tx_stats.msdu[tid] += 3375 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3376 else 3377 sta->tx_stats.msdu[tid]++; 3378 3379 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3380 3381 /* statistics normally done by ieee80211_tx_h_stats (but that 3382 * has to consider fragmentation, so is more complex) 3383 */ 3384 sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3385 sta->tx_stats.packets[skb_get_queue_mapping(skb)]++; 3386 3387 if (pn_offs) { 3388 u64 pn; 3389 u8 *crypto_hdr = skb->data + pn_offs; 3390 3391 switch (key->conf.cipher) { 3392 case WLAN_CIPHER_SUITE_CCMP: 3393 case WLAN_CIPHER_SUITE_CCMP_256: 3394 case WLAN_CIPHER_SUITE_GCMP: 3395 case WLAN_CIPHER_SUITE_GCMP_256: 3396 pn = atomic64_inc_return(&key->conf.tx_pn); 3397 crypto_hdr[0] = pn; 3398 crypto_hdr[1] = pn >> 8; 3399 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3400 crypto_hdr[4] = pn >> 16; 3401 crypto_hdr[5] = pn >> 24; 3402 crypto_hdr[6] = pn >> 32; 3403 crypto_hdr[7] = pn >> 40; 3404 break; 3405 } 3406 } 3407 } 3408 3409 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3410 struct sta_info *sta, 3411 struct ieee80211_fast_tx *fast_tx, 3412 struct sk_buff *skb) 3413 { 3414 struct ieee80211_local *local = sdata->local; 3415 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3416 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3417 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3418 struct ethhdr eth; 3419 struct ieee80211_tx_info *info; 3420 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3421 struct ieee80211_tx_data tx; 3422 ieee80211_tx_result r; 3423 struct tid_ampdu_tx *tid_tx = NULL; 3424 u8 tid = IEEE80211_NUM_TIDS; 3425 3426 /* control port protocol needs a lot of special handling */ 3427 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3428 return false; 3429 3430 /* only RFC 1042 SNAP */ 3431 if (ethertype < ETH_P_802_3_MIN) 3432 return false; 3433 3434 /* don't handle TX status request here either */ 3435 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3436 return false; 3437 3438 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3439 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3440 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3441 if (tid_tx) { 3442 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3443 return false; 3444 if (tid_tx->timeout) 3445 tid_tx->last_tx = jiffies; 3446 } 3447 } 3448 3449 /* after this point (skb is modified) we cannot return false */ 3450 3451 if (skb_shared(skb)) { 3452 struct sk_buff *tmp_skb = skb; 3453 3454 skb = skb_clone(skb, GFP_ATOMIC); 3455 kfree_skb(tmp_skb); 3456 3457 if (!skb) 3458 return true; 3459 } 3460 3461 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3462 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3463 return true; 3464 3465 /* will not be crypto-handled beyond what we do here, so use false 3466 * as the may-encrypt argument for the resize to not account for 3467 * more room than we already have in 'extra_head' 3468 */ 3469 if (unlikely(ieee80211_skb_resize(sdata, skb, 3470 max_t(int, extra_head + hw_headroom - 3471 skb_headroom(skb), 0), 3472 false))) { 3473 kfree_skb(skb); 3474 return true; 3475 } 3476 3477 memcpy(ð, skb->data, ETH_HLEN - 2); 3478 hdr = skb_push(skb, extra_head); 3479 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3480 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3481 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3482 3483 info = IEEE80211_SKB_CB(skb); 3484 memset(info, 0, sizeof(*info)); 3485 info->band = fast_tx->band; 3486 info->control.vif = &sdata->vif; 3487 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3488 IEEE80211_TX_CTL_DONTFRAG | 3489 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3490 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT; 3491 3492 #ifdef CONFIG_MAC80211_DEBUGFS 3493 if (local->force_tx_status) 3494 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3495 #endif 3496 3497 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3498 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3499 *ieee80211_get_qos_ctl(hdr) = tid; 3500 } 3501 3502 __skb_queue_head_init(&tx.skbs); 3503 3504 tx.flags = IEEE80211_TX_UNICAST; 3505 tx.local = local; 3506 tx.sdata = sdata; 3507 tx.sta = sta; 3508 tx.key = fast_tx->key; 3509 3510 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3511 tx.skb = skb; 3512 r = ieee80211_tx_h_rate_ctrl(&tx); 3513 skb = tx.skb; 3514 tx.skb = NULL; 3515 3516 if (r != TX_CONTINUE) { 3517 if (r != TX_QUEUED) 3518 kfree_skb(skb); 3519 return true; 3520 } 3521 } 3522 3523 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3524 return true; 3525 3526 ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3527 fast_tx->key, skb); 3528 3529 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3530 sdata = container_of(sdata->bss, 3531 struct ieee80211_sub_if_data, u.ap); 3532 3533 __skb_queue_tail(&tx.skbs, skb); 3534 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3535 return true; 3536 } 3537 3538 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3539 struct ieee80211_txq *txq) 3540 { 3541 struct ieee80211_local *local = hw_to_local(hw); 3542 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3543 struct ieee80211_hdr *hdr; 3544 struct sk_buff *skb = NULL; 3545 struct fq *fq = &local->fq; 3546 struct fq_tin *tin = &txqi->tin; 3547 struct ieee80211_tx_info *info; 3548 struct ieee80211_tx_data tx; 3549 ieee80211_tx_result r; 3550 struct ieee80211_vif *vif = txq->vif; 3551 3552 WARN_ON_ONCE(softirq_count() == 0); 3553 3554 begin: 3555 spin_lock_bh(&fq->lock); 3556 3557 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3558 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3559 goto out; 3560 3561 if (vif->txqs_stopped[ieee80211_ac_from_tid(txq->tid)]) { 3562 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3563 goto out; 3564 } 3565 3566 /* Make sure fragments stay together. */ 3567 skb = __skb_dequeue(&txqi->frags); 3568 if (skb) 3569 goto out; 3570 3571 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3572 if (!skb) 3573 goto out; 3574 3575 spin_unlock_bh(&fq->lock); 3576 3577 hdr = (struct ieee80211_hdr *)skb->data; 3578 info = IEEE80211_SKB_CB(skb); 3579 3580 memset(&tx, 0, sizeof(tx)); 3581 __skb_queue_head_init(&tx.skbs); 3582 tx.local = local; 3583 tx.skb = skb; 3584 tx.sdata = vif_to_sdata(info->control.vif); 3585 3586 if (txq->sta) 3587 tx.sta = container_of(txq->sta, struct sta_info, sta); 3588 3589 /* 3590 * The key can be removed while the packet was queued, so need to call 3591 * this here to get the current key. 3592 */ 3593 r = ieee80211_tx_h_select_key(&tx); 3594 if (r != TX_CONTINUE) { 3595 ieee80211_free_txskb(&local->hw, skb); 3596 goto begin; 3597 } 3598 3599 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3600 info->flags |= IEEE80211_TX_CTL_AMPDU; 3601 else 3602 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3603 3604 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3605 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3606 sta); 3607 u8 pn_offs = 0; 3608 3609 if (tx.key && 3610 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3611 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3612 3613 ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3614 tx.key, skb); 3615 } else { 3616 if (invoke_tx_handlers_late(&tx)) 3617 goto begin; 3618 3619 skb = __skb_dequeue(&tx.skbs); 3620 3621 if (!skb_queue_empty(&tx.skbs)) { 3622 spin_lock_bh(&fq->lock); 3623 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3624 spin_unlock_bh(&fq->lock); 3625 } 3626 } 3627 3628 if (skb_has_frag_list(skb) && 3629 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3630 if (skb_linearize(skb)) { 3631 ieee80211_free_txskb(&local->hw, skb); 3632 goto begin; 3633 } 3634 } 3635 3636 switch (tx.sdata->vif.type) { 3637 case NL80211_IFTYPE_MONITOR: 3638 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3639 vif = &tx.sdata->vif; 3640 break; 3641 } 3642 tx.sdata = rcu_dereference(local->monitor_sdata); 3643 if (tx.sdata) { 3644 vif = &tx.sdata->vif; 3645 info->hw_queue = 3646 vif->hw_queue[skb_get_queue_mapping(skb)]; 3647 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3648 ieee80211_free_txskb(&local->hw, skb); 3649 goto begin; 3650 } else { 3651 vif = NULL; 3652 } 3653 break; 3654 case NL80211_IFTYPE_AP_VLAN: 3655 tx.sdata = container_of(tx.sdata->bss, 3656 struct ieee80211_sub_if_data, u.ap); 3657 /* fall through */ 3658 default: 3659 vif = &tx.sdata->vif; 3660 break; 3661 } 3662 3663 IEEE80211_SKB_CB(skb)->control.vif = vif; 3664 return skb; 3665 3666 out: 3667 spin_unlock_bh(&fq->lock); 3668 3669 return skb; 3670 } 3671 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3672 3673 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3674 { 3675 struct ieee80211_local *local = hw_to_local(hw); 3676 struct ieee80211_txq *ret = NULL; 3677 struct txq_info *txqi = NULL; 3678 3679 spin_lock_bh(&local->active_txq_lock[ac]); 3680 3681 begin: 3682 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3683 struct txq_info, 3684 schedule_order); 3685 if (!txqi) 3686 goto out; 3687 3688 if (txqi->txq.sta) { 3689 struct sta_info *sta = container_of(txqi->txq.sta, 3690 struct sta_info, sta); 3691 3692 if (sta->airtime[txqi->txq.ac].deficit < 0) { 3693 sta->airtime[txqi->txq.ac].deficit += 3694 sta->airtime_weight; 3695 list_move_tail(&txqi->schedule_order, 3696 &local->active_txqs[txqi->txq.ac]); 3697 goto begin; 3698 } 3699 } 3700 3701 3702 if (txqi->schedule_round == local->schedule_round[ac]) 3703 goto out; 3704 3705 list_del_init(&txqi->schedule_order); 3706 txqi->schedule_round = local->schedule_round[ac]; 3707 ret = &txqi->txq; 3708 3709 out: 3710 spin_unlock_bh(&local->active_txq_lock[ac]); 3711 return ret; 3712 } 3713 EXPORT_SYMBOL(ieee80211_next_txq); 3714 3715 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3716 struct ieee80211_txq *txq, 3717 bool force) 3718 { 3719 struct ieee80211_local *local = hw_to_local(hw); 3720 struct txq_info *txqi = to_txq_info(txq); 3721 3722 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3723 3724 if (list_empty(&txqi->schedule_order) && 3725 (force || !skb_queue_empty(&txqi->frags) || 3726 txqi->tin.backlog_packets)) { 3727 /* If airtime accounting is active, always enqueue STAs at the 3728 * head of the list to ensure that they only get moved to the 3729 * back by the airtime DRR scheduler once they have a negative 3730 * deficit. A station that already has a negative deficit will 3731 * get immediately moved to the back of the list on the next 3732 * call to ieee80211_next_txq(). 3733 */ 3734 if (txqi->txq.sta && 3735 wiphy_ext_feature_isset(local->hw.wiphy, 3736 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3737 list_add(&txqi->schedule_order, 3738 &local->active_txqs[txq->ac]); 3739 else 3740 list_add_tail(&txqi->schedule_order, 3741 &local->active_txqs[txq->ac]); 3742 } 3743 3744 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3745 } 3746 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3747 3748 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3749 struct ieee80211_txq *txq) 3750 { 3751 struct ieee80211_local *local = hw_to_local(hw); 3752 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3753 struct sta_info *sta; 3754 u8 ac = txq->ac; 3755 3756 spin_lock_bh(&local->active_txq_lock[ac]); 3757 3758 if (!txqi->txq.sta) 3759 goto out; 3760 3761 if (list_empty(&txqi->schedule_order)) 3762 goto out; 3763 3764 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3765 schedule_order) { 3766 if (iter == txqi) 3767 break; 3768 3769 if (!iter->txq.sta) { 3770 list_move_tail(&iter->schedule_order, 3771 &local->active_txqs[ac]); 3772 continue; 3773 } 3774 sta = container_of(iter->txq.sta, struct sta_info, sta); 3775 if (sta->airtime[ac].deficit < 0) 3776 sta->airtime[ac].deficit += sta->airtime_weight; 3777 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 3778 } 3779 3780 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3781 if (sta->airtime[ac].deficit >= 0) 3782 goto out; 3783 3784 sta->airtime[ac].deficit += sta->airtime_weight; 3785 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 3786 spin_unlock_bh(&local->active_txq_lock[ac]); 3787 3788 return false; 3789 out: 3790 if (!list_empty(&txqi->schedule_order)) 3791 list_del_init(&txqi->schedule_order); 3792 spin_unlock_bh(&local->active_txq_lock[ac]); 3793 3794 return true; 3795 } 3796 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 3797 3798 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 3799 { 3800 struct ieee80211_local *local = hw_to_local(hw); 3801 3802 spin_lock_bh(&local->active_txq_lock[ac]); 3803 local->schedule_round[ac]++; 3804 spin_unlock_bh(&local->active_txq_lock[ac]); 3805 } 3806 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 3807 3808 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 3809 struct net_device *dev, 3810 u32 info_flags, 3811 u32 ctrl_flags) 3812 { 3813 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3814 struct ieee80211_local *local = sdata->local; 3815 struct sta_info *sta; 3816 struct sk_buff *next; 3817 3818 if (unlikely(skb->len < ETH_HLEN)) { 3819 kfree_skb(skb); 3820 return; 3821 } 3822 3823 rcu_read_lock(); 3824 3825 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 3826 goto out_free; 3827 3828 if (IS_ERR(sta)) 3829 sta = NULL; 3830 3831 if (local->ops->wake_tx_queue) { 3832 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 3833 skb_set_queue_mapping(skb, queue); 3834 } 3835 3836 if (sta) { 3837 struct ieee80211_fast_tx *fast_tx; 3838 3839 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 3840 3841 fast_tx = rcu_dereference(sta->fast_tx); 3842 3843 if (fast_tx && 3844 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 3845 goto out; 3846 } 3847 3848 if (skb_is_gso(skb)) { 3849 struct sk_buff *segs; 3850 3851 segs = skb_gso_segment(skb, 0); 3852 if (IS_ERR(segs)) { 3853 goto out_free; 3854 } else if (segs) { 3855 consume_skb(skb); 3856 skb = segs; 3857 } 3858 } else { 3859 /* we cannot process non-linear frames on this path */ 3860 if (skb_linearize(skb)) { 3861 kfree_skb(skb); 3862 goto out; 3863 } 3864 3865 /* the frame could be fragmented, software-encrypted, and other 3866 * things so we cannot really handle checksum offload with it - 3867 * fix it up in software before we handle anything else. 3868 */ 3869 if (skb->ip_summed == CHECKSUM_PARTIAL) { 3870 skb_set_transport_header(skb, 3871 skb_checksum_start_offset(skb)); 3872 if (skb_checksum_help(skb)) 3873 goto out_free; 3874 } 3875 } 3876 3877 next = skb; 3878 while (next) { 3879 skb = next; 3880 next = skb->next; 3881 3882 skb->prev = NULL; 3883 skb->next = NULL; 3884 3885 skb = ieee80211_build_hdr(sdata, skb, info_flags, 3886 sta, ctrl_flags); 3887 if (IS_ERR(skb)) 3888 goto out; 3889 3890 ieee80211_tx_stats(dev, skb->len); 3891 3892 ieee80211_xmit(sdata, sta, skb, 0); 3893 } 3894 goto out; 3895 out_free: 3896 kfree_skb(skb); 3897 out: 3898 rcu_read_unlock(); 3899 } 3900 3901 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 3902 { 3903 struct ethhdr *eth; 3904 int err; 3905 3906 err = skb_ensure_writable(skb, ETH_HLEN); 3907 if (unlikely(err)) 3908 return err; 3909 3910 eth = (void *)skb->data; 3911 ether_addr_copy(eth->h_dest, sta->sta.addr); 3912 3913 return 0; 3914 } 3915 3916 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 3917 struct net_device *dev) 3918 { 3919 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3920 const struct ethhdr *eth = (void *)skb->data; 3921 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 3922 __be16 ethertype; 3923 3924 if (likely(!is_multicast_ether_addr(eth->h_dest))) 3925 return false; 3926 3927 switch (sdata->vif.type) { 3928 case NL80211_IFTYPE_AP_VLAN: 3929 if (sdata->u.vlan.sta) 3930 return false; 3931 if (sdata->wdev.use_4addr) 3932 return false; 3933 /* fall through */ 3934 case NL80211_IFTYPE_AP: 3935 /* check runtime toggle for this bss */ 3936 if (!sdata->bss->multicast_to_unicast) 3937 return false; 3938 break; 3939 default: 3940 return false; 3941 } 3942 3943 /* multicast to unicast conversion only for some payload */ 3944 ethertype = eth->h_proto; 3945 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 3946 ethertype = ethvlan->h_vlan_encapsulated_proto; 3947 switch (ethertype) { 3948 case htons(ETH_P_ARP): 3949 case htons(ETH_P_IP): 3950 case htons(ETH_P_IPV6): 3951 break; 3952 default: 3953 return false; 3954 } 3955 3956 return true; 3957 } 3958 3959 static void 3960 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 3961 struct sk_buff_head *queue) 3962 { 3963 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 3964 struct ieee80211_local *local = sdata->local; 3965 const struct ethhdr *eth = (struct ethhdr *)skb->data; 3966 struct sta_info *sta, *first = NULL; 3967 struct sk_buff *cloned_skb; 3968 3969 rcu_read_lock(); 3970 3971 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3972 if (sdata != sta->sdata) 3973 /* AP-VLAN mismatch */ 3974 continue; 3975 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 3976 /* do not send back to source */ 3977 continue; 3978 if (!first) { 3979 first = sta; 3980 continue; 3981 } 3982 cloned_skb = skb_clone(skb, GFP_ATOMIC); 3983 if (!cloned_skb) 3984 goto multicast; 3985 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 3986 dev_kfree_skb(cloned_skb); 3987 goto multicast; 3988 } 3989 __skb_queue_tail(queue, cloned_skb); 3990 } 3991 3992 if (likely(first)) { 3993 if (unlikely(ieee80211_change_da(skb, first))) 3994 goto multicast; 3995 __skb_queue_tail(queue, skb); 3996 } else { 3997 /* no STA connected, drop */ 3998 kfree_skb(skb); 3999 skb = NULL; 4000 } 4001 4002 goto out; 4003 multicast: 4004 __skb_queue_purge(queue); 4005 __skb_queue_tail(queue, skb); 4006 out: 4007 rcu_read_unlock(); 4008 } 4009 4010 /** 4011 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4012 * @skb: packet to be sent 4013 * @dev: incoming interface 4014 * 4015 * On failure skb will be freed. 4016 */ 4017 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4018 struct net_device *dev) 4019 { 4020 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4021 struct sk_buff_head queue; 4022 4023 __skb_queue_head_init(&queue); 4024 ieee80211_convert_to_unicast(skb, dev, &queue); 4025 while ((skb = __skb_dequeue(&queue))) 4026 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4027 } else { 4028 __ieee80211_subif_start_xmit(skb, dev, 0, 0); 4029 } 4030 4031 return NETDEV_TX_OK; 4032 } 4033 4034 struct sk_buff * 4035 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4036 struct sk_buff *skb, u32 info_flags) 4037 { 4038 struct ieee80211_hdr *hdr; 4039 struct ieee80211_tx_data tx = { 4040 .local = sdata->local, 4041 .sdata = sdata, 4042 }; 4043 struct sta_info *sta; 4044 4045 rcu_read_lock(); 4046 4047 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4048 kfree_skb(skb); 4049 skb = ERR_PTR(-EINVAL); 4050 goto out; 4051 } 4052 4053 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0); 4054 if (IS_ERR(skb)) 4055 goto out; 4056 4057 hdr = (void *)skb->data; 4058 tx.sta = sta_info_get(sdata, hdr->addr1); 4059 tx.skb = skb; 4060 4061 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4062 rcu_read_unlock(); 4063 kfree_skb(skb); 4064 return ERR_PTR(-EINVAL); 4065 } 4066 4067 out: 4068 rcu_read_unlock(); 4069 return skb; 4070 } 4071 4072 /* 4073 * ieee80211_clear_tx_pending may not be called in a context where 4074 * it is possible that it packets could come in again. 4075 */ 4076 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4077 { 4078 struct sk_buff *skb; 4079 int i; 4080 4081 for (i = 0; i < local->hw.queues; i++) { 4082 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4083 ieee80211_free_txskb(&local->hw, skb); 4084 } 4085 } 4086 4087 /* 4088 * Returns false if the frame couldn't be transmitted but was queued instead, 4089 * which in this case means re-queued -- take as an indication to stop sending 4090 * more pending frames. 4091 */ 4092 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4093 struct sk_buff *skb) 4094 { 4095 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4096 struct ieee80211_sub_if_data *sdata; 4097 struct sta_info *sta; 4098 struct ieee80211_hdr *hdr; 4099 bool result; 4100 struct ieee80211_chanctx_conf *chanctx_conf; 4101 4102 sdata = vif_to_sdata(info->control.vif); 4103 4104 if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { 4105 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4106 if (unlikely(!chanctx_conf)) { 4107 dev_kfree_skb(skb); 4108 return true; 4109 } 4110 info->band = chanctx_conf->def.chan->band; 4111 result = ieee80211_tx(sdata, NULL, skb, true, 0); 4112 } else { 4113 struct sk_buff_head skbs; 4114 4115 __skb_queue_head_init(&skbs); 4116 __skb_queue_tail(&skbs, skb); 4117 4118 hdr = (struct ieee80211_hdr *)skb->data; 4119 sta = sta_info_get(sdata, hdr->addr1); 4120 4121 result = __ieee80211_tx(local, &skbs, skb->len, sta, true); 4122 } 4123 4124 return result; 4125 } 4126 4127 /* 4128 * Transmit all pending packets. Called from tasklet. 4129 */ 4130 void ieee80211_tx_pending(unsigned long data) 4131 { 4132 struct ieee80211_local *local = (struct ieee80211_local *)data; 4133 unsigned long flags; 4134 int i; 4135 bool txok; 4136 4137 rcu_read_lock(); 4138 4139 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4140 for (i = 0; i < local->hw.queues; i++) { 4141 /* 4142 * If queue is stopped by something other than due to pending 4143 * frames, or we have no pending frames, proceed to next queue. 4144 */ 4145 if (local->queue_stop_reasons[i] || 4146 skb_queue_empty(&local->pending[i])) 4147 continue; 4148 4149 while (!skb_queue_empty(&local->pending[i])) { 4150 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4151 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4152 4153 if (WARN_ON(!info->control.vif)) { 4154 ieee80211_free_txskb(&local->hw, skb); 4155 continue; 4156 } 4157 4158 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4159 flags); 4160 4161 txok = ieee80211_tx_pending_skb(local, skb); 4162 spin_lock_irqsave(&local->queue_stop_reason_lock, 4163 flags); 4164 if (!txok) 4165 break; 4166 } 4167 4168 if (skb_queue_empty(&local->pending[i])) 4169 ieee80211_propagate_queue_wake(local, i); 4170 } 4171 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4172 4173 rcu_read_unlock(); 4174 } 4175 4176 /* functions for drivers to get certain frames */ 4177 4178 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4179 struct ps_data *ps, struct sk_buff *skb, 4180 bool is_template) 4181 { 4182 u8 *pos, *tim; 4183 int aid0 = 0; 4184 int i, have_bits = 0, n1, n2; 4185 4186 /* Generate bitmap for TIM only if there are any STAs in power save 4187 * mode. */ 4188 if (atomic_read(&ps->num_sta_ps) > 0) 4189 /* in the hope that this is faster than 4190 * checking byte-for-byte */ 4191 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4192 IEEE80211_MAX_AID+1); 4193 if (!is_template) { 4194 if (ps->dtim_count == 0) 4195 ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; 4196 else 4197 ps->dtim_count--; 4198 } 4199 4200 tim = pos = skb_put(skb, 6); 4201 *pos++ = WLAN_EID_TIM; 4202 *pos++ = 4; 4203 *pos++ = ps->dtim_count; 4204 *pos++ = sdata->vif.bss_conf.dtim_period; 4205 4206 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4207 aid0 = 1; 4208 4209 ps->dtim_bc_mc = aid0 == 1; 4210 4211 if (have_bits) { 4212 /* Find largest even number N1 so that bits numbered 1 through 4213 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4214 * (N2 + 1) x 8 through 2007 are 0. */ 4215 n1 = 0; 4216 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4217 if (ps->tim[i]) { 4218 n1 = i & 0xfe; 4219 break; 4220 } 4221 } 4222 n2 = n1; 4223 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4224 if (ps->tim[i]) { 4225 n2 = i; 4226 break; 4227 } 4228 } 4229 4230 /* Bitmap control */ 4231 *pos++ = n1 | aid0; 4232 /* Part Virt Bitmap */ 4233 skb_put(skb, n2 - n1); 4234 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4235 4236 tim[1] = n2 - n1 + 4; 4237 } else { 4238 *pos++ = aid0; /* Bitmap control */ 4239 *pos++ = 0; /* Part Virt Bitmap */ 4240 } 4241 } 4242 4243 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4244 struct ps_data *ps, struct sk_buff *skb, 4245 bool is_template) 4246 { 4247 struct ieee80211_local *local = sdata->local; 4248 4249 /* 4250 * Not very nice, but we want to allow the driver to call 4251 * ieee80211_beacon_get() as a response to the set_tim() 4252 * callback. That, however, is already invoked under the 4253 * sta_lock to guarantee consistent and race-free update 4254 * of the tim bitmap in mac80211 and the driver. 4255 */ 4256 if (local->tim_in_locked_section) { 4257 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4258 } else { 4259 spin_lock_bh(&local->tim_lock); 4260 __ieee80211_beacon_add_tim(sdata, ps, skb, is_template); 4261 spin_unlock_bh(&local->tim_lock); 4262 } 4263 4264 return 0; 4265 } 4266 4267 static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata, 4268 struct beacon_data *beacon) 4269 { 4270 struct probe_resp *resp; 4271 u8 *beacon_data; 4272 size_t beacon_data_len; 4273 int i; 4274 u8 count = beacon->csa_current_counter; 4275 4276 switch (sdata->vif.type) { 4277 case NL80211_IFTYPE_AP: 4278 beacon_data = beacon->tail; 4279 beacon_data_len = beacon->tail_len; 4280 break; 4281 case NL80211_IFTYPE_ADHOC: 4282 beacon_data = beacon->head; 4283 beacon_data_len = beacon->head_len; 4284 break; 4285 case NL80211_IFTYPE_MESH_POINT: 4286 beacon_data = beacon->head; 4287 beacon_data_len = beacon->head_len; 4288 break; 4289 default: 4290 return; 4291 } 4292 4293 rcu_read_lock(); 4294 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; ++i) { 4295 resp = rcu_dereference(sdata->u.ap.probe_resp); 4296 4297 if (beacon->csa_counter_offsets[i]) { 4298 if (WARN_ON_ONCE(beacon->csa_counter_offsets[i] >= 4299 beacon_data_len)) { 4300 rcu_read_unlock(); 4301 return; 4302 } 4303 4304 beacon_data[beacon->csa_counter_offsets[i]] = count; 4305 } 4306 4307 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) 4308 resp->data[resp->csa_counter_offsets[i]] = count; 4309 } 4310 rcu_read_unlock(); 4311 } 4312 4313 static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon) 4314 { 4315 beacon->csa_current_counter--; 4316 4317 /* the counter should never reach 0 */ 4318 WARN_ON_ONCE(!beacon->csa_current_counter); 4319 4320 return beacon->csa_current_counter; 4321 } 4322 4323 u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif) 4324 { 4325 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4326 struct beacon_data *beacon = NULL; 4327 u8 count = 0; 4328 4329 rcu_read_lock(); 4330 4331 if (sdata->vif.type == NL80211_IFTYPE_AP) 4332 beacon = rcu_dereference(sdata->u.ap.beacon); 4333 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4334 beacon = rcu_dereference(sdata->u.ibss.presp); 4335 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4336 beacon = rcu_dereference(sdata->u.mesh.beacon); 4337 4338 if (!beacon) 4339 goto unlock; 4340 4341 count = __ieee80211_csa_update_counter(beacon); 4342 4343 unlock: 4344 rcu_read_unlock(); 4345 return count; 4346 } 4347 EXPORT_SYMBOL(ieee80211_csa_update_counter); 4348 4349 void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter) 4350 { 4351 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4352 struct beacon_data *beacon = NULL; 4353 4354 rcu_read_lock(); 4355 4356 if (sdata->vif.type == NL80211_IFTYPE_AP) 4357 beacon = rcu_dereference(sdata->u.ap.beacon); 4358 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4359 beacon = rcu_dereference(sdata->u.ibss.presp); 4360 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4361 beacon = rcu_dereference(sdata->u.mesh.beacon); 4362 4363 if (!beacon) 4364 goto unlock; 4365 4366 if (counter < beacon->csa_current_counter) 4367 beacon->csa_current_counter = counter; 4368 4369 unlock: 4370 rcu_read_unlock(); 4371 } 4372 EXPORT_SYMBOL(ieee80211_csa_set_counter); 4373 4374 bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) 4375 { 4376 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4377 struct beacon_data *beacon = NULL; 4378 u8 *beacon_data; 4379 size_t beacon_data_len; 4380 int ret = false; 4381 4382 if (!ieee80211_sdata_running(sdata)) 4383 return false; 4384 4385 rcu_read_lock(); 4386 if (vif->type == NL80211_IFTYPE_AP) { 4387 struct ieee80211_if_ap *ap = &sdata->u.ap; 4388 4389 beacon = rcu_dereference(ap->beacon); 4390 if (WARN_ON(!beacon || !beacon->tail)) 4391 goto out; 4392 beacon_data = beacon->tail; 4393 beacon_data_len = beacon->tail_len; 4394 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4395 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4396 4397 beacon = rcu_dereference(ifibss->presp); 4398 if (!beacon) 4399 goto out; 4400 4401 beacon_data = beacon->head; 4402 beacon_data_len = beacon->head_len; 4403 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4404 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4405 4406 beacon = rcu_dereference(ifmsh->beacon); 4407 if (!beacon) 4408 goto out; 4409 4410 beacon_data = beacon->head; 4411 beacon_data_len = beacon->head_len; 4412 } else { 4413 WARN_ON(1); 4414 goto out; 4415 } 4416 4417 if (!beacon->csa_counter_offsets[0]) 4418 goto out; 4419 4420 if (WARN_ON_ONCE(beacon->csa_counter_offsets[0] > beacon_data_len)) 4421 goto out; 4422 4423 if (beacon_data[beacon->csa_counter_offsets[0]] == 1) 4424 ret = true; 4425 out: 4426 rcu_read_unlock(); 4427 4428 return ret; 4429 } 4430 EXPORT_SYMBOL(ieee80211_csa_is_complete); 4431 4432 static struct sk_buff * 4433 __ieee80211_beacon_get(struct ieee80211_hw *hw, 4434 struct ieee80211_vif *vif, 4435 struct ieee80211_mutable_offsets *offs, 4436 bool is_template) 4437 { 4438 struct ieee80211_local *local = hw_to_local(hw); 4439 struct beacon_data *beacon = NULL; 4440 struct sk_buff *skb = NULL; 4441 struct ieee80211_tx_info *info; 4442 struct ieee80211_sub_if_data *sdata = NULL; 4443 enum nl80211_band band; 4444 struct ieee80211_tx_rate_control txrc; 4445 struct ieee80211_chanctx_conf *chanctx_conf; 4446 int csa_off_base = 0; 4447 4448 rcu_read_lock(); 4449 4450 sdata = vif_to_sdata(vif); 4451 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4452 4453 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 4454 goto out; 4455 4456 if (offs) 4457 memset(offs, 0, sizeof(*offs)); 4458 4459 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4460 struct ieee80211_if_ap *ap = &sdata->u.ap; 4461 4462 beacon = rcu_dereference(ap->beacon); 4463 if (beacon) { 4464 if (beacon->csa_counter_offsets[0]) { 4465 if (!is_template) 4466 __ieee80211_csa_update_counter(beacon); 4467 4468 ieee80211_set_csa(sdata, beacon); 4469 } 4470 4471 /* 4472 * headroom, head length, 4473 * tail length and maximum TIM length 4474 */ 4475 skb = dev_alloc_skb(local->tx_headroom + 4476 beacon->head_len + 4477 beacon->tail_len + 256 + 4478 local->hw.extra_beacon_tailroom); 4479 if (!skb) 4480 goto out; 4481 4482 skb_reserve(skb, local->tx_headroom); 4483 skb_put_data(skb, beacon->head, beacon->head_len); 4484 4485 ieee80211_beacon_add_tim(sdata, &ap->ps, skb, 4486 is_template); 4487 4488 if (offs) { 4489 offs->tim_offset = beacon->head_len; 4490 offs->tim_length = skb->len - beacon->head_len; 4491 4492 /* for AP the csa offsets are from tail */ 4493 csa_off_base = skb->len; 4494 } 4495 4496 if (beacon->tail) 4497 skb_put_data(skb, beacon->tail, 4498 beacon->tail_len); 4499 } else 4500 goto out; 4501 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 4502 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4503 struct ieee80211_hdr *hdr; 4504 4505 beacon = rcu_dereference(ifibss->presp); 4506 if (!beacon) 4507 goto out; 4508 4509 if (beacon->csa_counter_offsets[0]) { 4510 if (!is_template) 4511 __ieee80211_csa_update_counter(beacon); 4512 4513 ieee80211_set_csa(sdata, beacon); 4514 } 4515 4516 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4517 local->hw.extra_beacon_tailroom); 4518 if (!skb) 4519 goto out; 4520 skb_reserve(skb, local->tx_headroom); 4521 skb_put_data(skb, beacon->head, beacon->head_len); 4522 4523 hdr = (struct ieee80211_hdr *) skb->data; 4524 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4525 IEEE80211_STYPE_BEACON); 4526 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4527 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4528 4529 beacon = rcu_dereference(ifmsh->beacon); 4530 if (!beacon) 4531 goto out; 4532 4533 if (beacon->csa_counter_offsets[0]) { 4534 if (!is_template) 4535 /* TODO: For mesh csa_counter is in TU, so 4536 * decrementing it by one isn't correct, but 4537 * for now we leave it consistent with overall 4538 * mac80211's behavior. 4539 */ 4540 __ieee80211_csa_update_counter(beacon); 4541 4542 ieee80211_set_csa(sdata, beacon); 4543 } 4544 4545 if (ifmsh->sync_ops) 4546 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 4547 4548 skb = dev_alloc_skb(local->tx_headroom + 4549 beacon->head_len + 4550 256 + /* TIM IE */ 4551 beacon->tail_len + 4552 local->hw.extra_beacon_tailroom); 4553 if (!skb) 4554 goto out; 4555 skb_reserve(skb, local->tx_headroom); 4556 skb_put_data(skb, beacon->head, beacon->head_len); 4557 ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb, is_template); 4558 4559 if (offs) { 4560 offs->tim_offset = beacon->head_len; 4561 offs->tim_length = skb->len - beacon->head_len; 4562 } 4563 4564 skb_put_data(skb, beacon->tail, beacon->tail_len); 4565 } else { 4566 WARN_ON(1); 4567 goto out; 4568 } 4569 4570 /* CSA offsets */ 4571 if (offs && beacon) { 4572 int i; 4573 4574 for (i = 0; i < IEEE80211_MAX_CSA_COUNTERS_NUM; i++) { 4575 u16 csa_off = beacon->csa_counter_offsets[i]; 4576 4577 if (!csa_off) 4578 continue; 4579 4580 offs->csa_counter_offs[i] = csa_off_base + csa_off; 4581 } 4582 } 4583 4584 band = chanctx_conf->def.chan->band; 4585 4586 info = IEEE80211_SKB_CB(skb); 4587 4588 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4589 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4590 info->band = band; 4591 4592 memset(&txrc, 0, sizeof(txrc)); 4593 txrc.hw = hw; 4594 txrc.sband = local->hw.wiphy->bands[band]; 4595 txrc.bss_conf = &sdata->vif.bss_conf; 4596 txrc.skb = skb; 4597 txrc.reported_rate.idx = -1; 4598 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4599 txrc.bss = true; 4600 rate_control_get_rate(sdata, NULL, &txrc); 4601 4602 info->control.vif = vif; 4603 4604 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4605 IEEE80211_TX_CTL_ASSIGN_SEQ | 4606 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4607 out: 4608 rcu_read_unlock(); 4609 return skb; 4610 4611 } 4612 4613 struct sk_buff * 4614 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 4615 struct ieee80211_vif *vif, 4616 struct ieee80211_mutable_offsets *offs) 4617 { 4618 return __ieee80211_beacon_get(hw, vif, offs, true); 4619 } 4620 EXPORT_SYMBOL(ieee80211_beacon_get_template); 4621 4622 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 4623 struct ieee80211_vif *vif, 4624 u16 *tim_offset, u16 *tim_length) 4625 { 4626 struct ieee80211_mutable_offsets offs = {}; 4627 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false); 4628 struct sk_buff *copy; 4629 struct ieee80211_supported_band *sband; 4630 int shift; 4631 4632 if (!bcn) 4633 return bcn; 4634 4635 if (tim_offset) 4636 *tim_offset = offs.tim_offset; 4637 4638 if (tim_length) 4639 *tim_length = offs.tim_length; 4640 4641 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 4642 !hw_to_local(hw)->monitors) 4643 return bcn; 4644 4645 /* send a copy to monitor interfaces */ 4646 copy = skb_copy(bcn, GFP_ATOMIC); 4647 if (!copy) 4648 return bcn; 4649 4650 shift = ieee80211_vif_get_shift(vif); 4651 sband = ieee80211_get_sband(vif_to_sdata(vif)); 4652 if (!sband) 4653 return bcn; 4654 4655 ieee80211_tx_monitor(hw_to_local(hw), copy, sband, 1, shift, false, 4656 NULL); 4657 4658 return bcn; 4659 } 4660 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 4661 4662 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 4663 struct ieee80211_vif *vif) 4664 { 4665 struct ieee80211_if_ap *ap = NULL; 4666 struct sk_buff *skb = NULL; 4667 struct probe_resp *presp = NULL; 4668 struct ieee80211_hdr *hdr; 4669 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4670 4671 if (sdata->vif.type != NL80211_IFTYPE_AP) 4672 return NULL; 4673 4674 rcu_read_lock(); 4675 4676 ap = &sdata->u.ap; 4677 presp = rcu_dereference(ap->probe_resp); 4678 if (!presp) 4679 goto out; 4680 4681 skb = dev_alloc_skb(presp->len); 4682 if (!skb) 4683 goto out; 4684 4685 skb_put_data(skb, presp->data, presp->len); 4686 4687 hdr = (struct ieee80211_hdr *) skb->data; 4688 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 4689 4690 out: 4691 rcu_read_unlock(); 4692 return skb; 4693 } 4694 EXPORT_SYMBOL(ieee80211_proberesp_get); 4695 4696 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 4697 struct ieee80211_vif *vif) 4698 { 4699 struct ieee80211_sub_if_data *sdata; 4700 struct ieee80211_if_managed *ifmgd; 4701 struct ieee80211_pspoll *pspoll; 4702 struct ieee80211_local *local; 4703 struct sk_buff *skb; 4704 4705 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4706 return NULL; 4707 4708 sdata = vif_to_sdata(vif); 4709 ifmgd = &sdata->u.mgd; 4710 local = sdata->local; 4711 4712 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 4713 if (!skb) 4714 return NULL; 4715 4716 skb_reserve(skb, local->hw.extra_tx_headroom); 4717 4718 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 4719 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 4720 IEEE80211_STYPE_PSPOLL); 4721 pspoll->aid = cpu_to_le16(ifmgd->aid); 4722 4723 /* aid in PS-Poll has its two MSBs each set to 1 */ 4724 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 4725 4726 memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); 4727 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 4728 4729 return skb; 4730 } 4731 EXPORT_SYMBOL(ieee80211_pspoll_get); 4732 4733 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 4734 struct ieee80211_vif *vif, 4735 bool qos_ok) 4736 { 4737 struct ieee80211_hdr_3addr *nullfunc; 4738 struct ieee80211_sub_if_data *sdata; 4739 struct ieee80211_if_managed *ifmgd; 4740 struct ieee80211_local *local; 4741 struct sk_buff *skb; 4742 bool qos = false; 4743 4744 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 4745 return NULL; 4746 4747 sdata = vif_to_sdata(vif); 4748 ifmgd = &sdata->u.mgd; 4749 local = sdata->local; 4750 4751 if (qos_ok) { 4752 struct sta_info *sta; 4753 4754 rcu_read_lock(); 4755 sta = sta_info_get(sdata, ifmgd->bssid); 4756 qos = sta && sta->sta.wme; 4757 rcu_read_unlock(); 4758 } 4759 4760 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 4761 sizeof(*nullfunc) + 2); 4762 if (!skb) 4763 return NULL; 4764 4765 skb_reserve(skb, local->hw.extra_tx_headroom); 4766 4767 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 4768 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 4769 IEEE80211_STYPE_NULLFUNC | 4770 IEEE80211_FCTL_TODS); 4771 if (qos) { 4772 __le16 qoshdr = cpu_to_le16(7); 4773 4774 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 4775 IEEE80211_STYPE_NULLFUNC) != 4776 IEEE80211_STYPE_QOS_NULLFUNC); 4777 nullfunc->frame_control |= 4778 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 4779 skb->priority = 7; 4780 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 4781 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 4782 } 4783 4784 memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); 4785 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 4786 memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); 4787 4788 return skb; 4789 } 4790 EXPORT_SYMBOL(ieee80211_nullfunc_get); 4791 4792 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 4793 const u8 *src_addr, 4794 const u8 *ssid, size_t ssid_len, 4795 size_t tailroom) 4796 { 4797 struct ieee80211_local *local = hw_to_local(hw); 4798 struct ieee80211_hdr_3addr *hdr; 4799 struct sk_buff *skb; 4800 size_t ie_ssid_len; 4801 u8 *pos; 4802 4803 ie_ssid_len = 2 + ssid_len; 4804 4805 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 4806 ie_ssid_len + tailroom); 4807 if (!skb) 4808 return NULL; 4809 4810 skb_reserve(skb, local->hw.extra_tx_headroom); 4811 4812 hdr = skb_put_zero(skb, sizeof(*hdr)); 4813 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 4814 IEEE80211_STYPE_PROBE_REQ); 4815 eth_broadcast_addr(hdr->addr1); 4816 memcpy(hdr->addr2, src_addr, ETH_ALEN); 4817 eth_broadcast_addr(hdr->addr3); 4818 4819 pos = skb_put(skb, ie_ssid_len); 4820 *pos++ = WLAN_EID_SSID; 4821 *pos++ = ssid_len; 4822 if (ssid_len) 4823 memcpy(pos, ssid, ssid_len); 4824 pos += ssid_len; 4825 4826 return skb; 4827 } 4828 EXPORT_SYMBOL(ieee80211_probereq_get); 4829 4830 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4831 const void *frame, size_t frame_len, 4832 const struct ieee80211_tx_info *frame_txctl, 4833 struct ieee80211_rts *rts) 4834 { 4835 const struct ieee80211_hdr *hdr = frame; 4836 4837 rts->frame_control = 4838 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 4839 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 4840 frame_txctl); 4841 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 4842 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 4843 } 4844 EXPORT_SYMBOL(ieee80211_rts_get); 4845 4846 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 4847 const void *frame, size_t frame_len, 4848 const struct ieee80211_tx_info *frame_txctl, 4849 struct ieee80211_cts *cts) 4850 { 4851 const struct ieee80211_hdr *hdr = frame; 4852 4853 cts->frame_control = 4854 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 4855 cts->duration = ieee80211_ctstoself_duration(hw, vif, 4856 frame_len, frame_txctl); 4857 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 4858 } 4859 EXPORT_SYMBOL(ieee80211_ctstoself_get); 4860 4861 struct sk_buff * 4862 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 4863 struct ieee80211_vif *vif) 4864 { 4865 struct ieee80211_local *local = hw_to_local(hw); 4866 struct sk_buff *skb = NULL; 4867 struct ieee80211_tx_data tx; 4868 struct ieee80211_sub_if_data *sdata; 4869 struct ps_data *ps; 4870 struct ieee80211_tx_info *info; 4871 struct ieee80211_chanctx_conf *chanctx_conf; 4872 4873 sdata = vif_to_sdata(vif); 4874 4875 rcu_read_lock(); 4876 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); 4877 4878 if (!chanctx_conf) 4879 goto out; 4880 4881 if (sdata->vif.type == NL80211_IFTYPE_AP) { 4882 struct beacon_data *beacon = 4883 rcu_dereference(sdata->u.ap.beacon); 4884 4885 if (!beacon || !beacon->head) 4886 goto out; 4887 4888 ps = &sdata->u.ap.ps; 4889 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 4890 ps = &sdata->u.mesh.ps; 4891 } else { 4892 goto out; 4893 } 4894 4895 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 4896 goto out; /* send buffered bc/mc only after DTIM beacon */ 4897 4898 while (1) { 4899 skb = skb_dequeue(&ps->bc_buf); 4900 if (!skb) 4901 goto out; 4902 local->total_ps_buffered--; 4903 4904 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 4905 struct ieee80211_hdr *hdr = 4906 (struct ieee80211_hdr *) skb->data; 4907 /* more buffered multicast/broadcast frames ==> set 4908 * MoreData flag in IEEE 802.11 header to inform PS 4909 * STAs */ 4910 hdr->frame_control |= 4911 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 4912 } 4913 4914 if (sdata->vif.type == NL80211_IFTYPE_AP) 4915 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 4916 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 4917 break; 4918 ieee80211_free_txskb(hw, skb); 4919 } 4920 4921 info = IEEE80211_SKB_CB(skb); 4922 4923 tx.flags |= IEEE80211_TX_PS_BUFFERED; 4924 info->band = chanctx_conf->def.chan->band; 4925 4926 if (invoke_tx_handlers(&tx)) 4927 skb = NULL; 4928 out: 4929 rcu_read_unlock(); 4930 4931 return skb; 4932 } 4933 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 4934 4935 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 4936 { 4937 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 4938 struct ieee80211_sub_if_data *sdata = sta->sdata; 4939 struct ieee80211_local *local = sdata->local; 4940 int ret; 4941 u32 queues; 4942 4943 lockdep_assert_held(&local->sta_mtx); 4944 4945 /* only some cases are supported right now */ 4946 switch (sdata->vif.type) { 4947 case NL80211_IFTYPE_STATION: 4948 case NL80211_IFTYPE_AP: 4949 case NL80211_IFTYPE_AP_VLAN: 4950 break; 4951 default: 4952 WARN_ON(1); 4953 return -EINVAL; 4954 } 4955 4956 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 4957 return -EINVAL; 4958 4959 if (sta->reserved_tid == tid) { 4960 ret = 0; 4961 goto out; 4962 } 4963 4964 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 4965 sdata_err(sdata, "TID reservation already active\n"); 4966 ret = -EALREADY; 4967 goto out; 4968 } 4969 4970 ieee80211_stop_vif_queues(sdata->local, sdata, 4971 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4972 4973 synchronize_net(); 4974 4975 /* Tear down BA sessions so we stop aggregating on this TID */ 4976 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 4977 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 4978 __ieee80211_stop_tx_ba_session(sta, tid, 4979 AGG_STOP_LOCAL_REQUEST); 4980 } 4981 4982 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 4983 __ieee80211_flush_queues(local, sdata, queues, false); 4984 4985 sta->reserved_tid = tid; 4986 4987 ieee80211_wake_vif_queues(local, sdata, 4988 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 4989 4990 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 4991 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 4992 4993 ret = 0; 4994 out: 4995 return ret; 4996 } 4997 EXPORT_SYMBOL(ieee80211_reserve_tid); 4998 4999 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5000 { 5001 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5002 struct ieee80211_sub_if_data *sdata = sta->sdata; 5003 5004 lockdep_assert_held(&sdata->local->sta_mtx); 5005 5006 /* only some cases are supported right now */ 5007 switch (sdata->vif.type) { 5008 case NL80211_IFTYPE_STATION: 5009 case NL80211_IFTYPE_AP: 5010 case NL80211_IFTYPE_AP_VLAN: 5011 break; 5012 default: 5013 WARN_ON(1); 5014 return; 5015 } 5016 5017 if (tid != sta->reserved_tid) { 5018 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5019 return; 5020 } 5021 5022 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5023 } 5024 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5025 5026 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5027 struct sk_buff *skb, int tid, 5028 enum nl80211_band band, u32 txdata_flags) 5029 { 5030 int ac = ieee80211_ac_from_tid(tid); 5031 5032 skb_reset_mac_header(skb); 5033 skb_set_queue_mapping(skb, ac); 5034 skb->priority = tid; 5035 5036 skb->dev = sdata->dev; 5037 5038 /* 5039 * The other path calling ieee80211_xmit is from the tasklet, 5040 * and while we can handle concurrent transmissions locking 5041 * requirements are that we do not come into tx with bhs on. 5042 */ 5043 local_bh_disable(); 5044 IEEE80211_SKB_CB(skb)->band = band; 5045 ieee80211_xmit(sdata, NULL, skb, txdata_flags); 5046 local_bh_enable(); 5047 } 5048 5049 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5050 const u8 *buf, size_t len, 5051 const u8 *dest, __be16 proto, bool unencrypted) 5052 { 5053 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5054 struct ieee80211_local *local = sdata->local; 5055 struct sk_buff *skb; 5056 struct ethhdr *ehdr; 5057 u32 flags; 5058 5059 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5060 * or Pre-Authentication 5061 */ 5062 if (proto != sdata->control_port_protocol && 5063 proto != cpu_to_be16(ETH_P_PREAUTH)) 5064 return -EINVAL; 5065 5066 if (unencrypted) 5067 flags = IEEE80211_TX_INTFL_DONT_ENCRYPT; 5068 else 5069 flags = 0; 5070 5071 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5072 sizeof(struct ethhdr) + len); 5073 if (!skb) 5074 return -ENOMEM; 5075 5076 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5077 5078 skb_put_data(skb, buf, len); 5079 5080 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5081 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5082 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5083 ehdr->h_proto = proto; 5084 5085 skb->dev = dev; 5086 skb->protocol = htons(ETH_P_802_3); 5087 skb_reset_network_header(skb); 5088 skb_reset_mac_header(skb); 5089 5090 local_bh_disable(); 5091 __ieee80211_subif_start_xmit(skb, skb->dev, flags, 0); 5092 local_bh_enable(); 5093 5094 return 0; 5095 } 5096 5097 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5098 const u8 *buf, size_t len) 5099 { 5100 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5101 struct ieee80211_local *local = sdata->local; 5102 struct sk_buff *skb; 5103 5104 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5105 30 + /* header size */ 5106 18); /* 11s header size */ 5107 if (!skb) 5108 return -ENOMEM; 5109 5110 skb_reserve(skb, local->hw.extra_tx_headroom); 5111 skb_put_data(skb, buf, len); 5112 5113 skb->dev = dev; 5114 skb->protocol = htons(ETH_P_802_3); 5115 skb_reset_network_header(skb); 5116 skb_reset_mac_header(skb); 5117 5118 local_bh_disable(); 5119 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5120 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP); 5121 local_bh_enable(); 5122 5123 return 0; 5124 } 5125