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