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) 2018-2022 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 __le16 ieee80211_duration(struct ieee80211_tx_data *tx, 42 struct sk_buff *skb, int group_addr, 43 int next_frag_len) 44 { 45 int rate, mrate, erp, dur, i, shift = 0; 46 struct ieee80211_rate *txrate; 47 struct ieee80211_local *local = tx->local; 48 struct ieee80211_supported_band *sband; 49 struct ieee80211_hdr *hdr; 50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 51 struct ieee80211_chanctx_conf *chanctx_conf; 52 u32 rate_flags = 0; 53 54 /* assume HW handles this */ 55 if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) 56 return 0; 57 58 rcu_read_lock(); 59 chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf); 60 if (chanctx_conf) { 61 shift = ieee80211_chandef_get_shift(&chanctx_conf->def); 62 rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); 63 } 64 rcu_read_unlock(); 65 66 /* uh huh? */ 67 if (WARN_ON_ONCE(tx->rate.idx < 0)) 68 return 0; 69 70 sband = local->hw.wiphy->bands[info->band]; 71 txrate = &sband->bitrates[tx->rate.idx]; 72 73 erp = txrate->flags & IEEE80211_RATE_ERP_G; 74 75 /* device is expected to do this */ 76 if (sband->band == NL80211_BAND_S1GHZ) 77 return 0; 78 79 /* 80 * data and mgmt (except PS Poll): 81 * - during CFP: 32768 82 * - during contention period: 83 * if addr1 is group address: 0 84 * if more fragments = 0 and addr1 is individual address: time to 85 * transmit one ACK plus SIFS 86 * if more fragments = 1 and addr1 is individual address: time to 87 * transmit next fragment plus 2 x ACK plus 3 x SIFS 88 * 89 * IEEE 802.11, 9.6: 90 * - control response frame (CTS or ACK) shall be transmitted using the 91 * same rate as the immediately previous frame in the frame exchange 92 * sequence, if this rate belongs to the PHY mandatory rates, or else 93 * at the highest possible rate belonging to the PHY rates in the 94 * BSSBasicRateSet 95 */ 96 hdr = (struct ieee80211_hdr *)skb->data; 97 if (ieee80211_is_ctl(hdr->frame_control)) { 98 /* TODO: These control frames are not currently sent by 99 * mac80211, but should they be implemented, this function 100 * needs to be updated to support duration field calculation. 101 * 102 * RTS: time needed to transmit pending data/mgmt frame plus 103 * one CTS frame plus one ACK frame plus 3 x SIFS 104 * CTS: duration of immediately previous RTS minus time 105 * required to transmit CTS and its SIFS 106 * ACK: 0 if immediately previous directed data/mgmt had 107 * more=0, with more=1 duration in ACK frame is duration 108 * from previous frame minus time needed to transmit ACK 109 * and its SIFS 110 * PS Poll: BIT(15) | BIT(14) | aid 111 */ 112 return 0; 113 } 114 115 /* data/mgmt */ 116 if (0 /* FIX: data/mgmt during CFP */) 117 return cpu_to_le16(32768); 118 119 if (group_addr) /* Group address as the destination - no ACK */ 120 return 0; 121 122 /* Individual destination address: 123 * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) 124 * CTS and ACK frames shall be transmitted using the highest rate in 125 * basic rate set that is less than or equal to the rate of the 126 * immediately previous frame and that is using the same modulation 127 * (CCK or OFDM). If no basic rate set matches with these requirements, 128 * the highest mandatory rate of the PHY that is less than or equal to 129 * the rate of the previous frame is used. 130 * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps 131 */ 132 rate = -1; 133 /* use lowest available if everything fails */ 134 mrate = sband->bitrates[0].bitrate; 135 for (i = 0; i < sband->n_bitrates; i++) { 136 struct ieee80211_rate *r = &sband->bitrates[i]; 137 138 if (r->bitrate > txrate->bitrate) 139 break; 140 141 if ((rate_flags & r->flags) != rate_flags) 142 continue; 143 144 if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) 145 rate = DIV_ROUND_UP(r->bitrate, 1 << shift); 146 147 switch (sband->band) { 148 case NL80211_BAND_2GHZ: 149 case NL80211_BAND_LC: { 150 u32 flag; 151 if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) 152 flag = IEEE80211_RATE_MANDATORY_G; 153 else 154 flag = IEEE80211_RATE_MANDATORY_B; 155 if (r->flags & flag) 156 mrate = r->bitrate; 157 break; 158 } 159 case NL80211_BAND_5GHZ: 160 case NL80211_BAND_6GHZ: 161 if (r->flags & IEEE80211_RATE_MANDATORY_A) 162 mrate = r->bitrate; 163 break; 164 case NL80211_BAND_S1GHZ: 165 case NL80211_BAND_60GHZ: 166 /* TODO, for now fall through */ 167 case NUM_NL80211_BANDS: 168 WARN_ON(1); 169 break; 170 } 171 } 172 if (rate == -1) { 173 /* No matching basic rate found; use highest suitable mandatory 174 * PHY rate */ 175 rate = DIV_ROUND_UP(mrate, 1 << shift); 176 } 177 178 /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ 179 if (ieee80211_is_data_qos(hdr->frame_control) && 180 *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) 181 dur = 0; 182 else 183 /* Time needed to transmit ACK 184 * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up 185 * to closest integer */ 186 dur = ieee80211_frame_duration(sband->band, 10, rate, erp, 187 tx->sdata->vif.bss_conf.use_short_preamble, 188 shift); 189 190 if (next_frag_len) { 191 /* Frame is fragmented: duration increases with time needed to 192 * transmit next fragment plus ACK and 2 x SIFS. */ 193 dur *= 2; /* ACK + SIFS */ 194 /* next fragment */ 195 dur += ieee80211_frame_duration(sband->band, next_frag_len, 196 txrate->bitrate, erp, 197 tx->sdata->vif.bss_conf.use_short_preamble, 198 shift); 199 } 200 201 return cpu_to_le16(dur); 202 } 203 204 /* tx handlers */ 205 static ieee80211_tx_result debug_noinline 206 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) 207 { 208 struct ieee80211_local *local = tx->local; 209 struct ieee80211_if_managed *ifmgd; 210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 211 212 /* driver doesn't support power save */ 213 if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) 214 return TX_CONTINUE; 215 216 /* hardware does dynamic power save */ 217 if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) 218 return TX_CONTINUE; 219 220 /* dynamic power save disabled */ 221 if (local->hw.conf.dynamic_ps_timeout <= 0) 222 return TX_CONTINUE; 223 224 /* we are scanning, don't enable power save */ 225 if (local->scanning) 226 return TX_CONTINUE; 227 228 if (!local->ps_sdata) 229 return TX_CONTINUE; 230 231 /* No point if we're going to suspend */ 232 if (local->quiescing) 233 return TX_CONTINUE; 234 235 /* dynamic ps is supported only in managed mode */ 236 if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) 237 return TX_CONTINUE; 238 239 if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) 240 return TX_CONTINUE; 241 242 ifmgd = &tx->sdata->u.mgd; 243 244 /* 245 * Don't wakeup from power save if u-apsd is enabled, voip ac has 246 * u-apsd enabled and the frame is in voip class. This effectively 247 * means that even if all access categories have u-apsd enabled, in 248 * practise u-apsd is only used with the voip ac. This is a 249 * workaround for the case when received voip class packets do not 250 * have correct qos tag for some reason, due the network or the 251 * peer application. 252 * 253 * Note: ifmgd->uapsd_queues access is racy here. If the value is 254 * changed via debugfs, user needs to reassociate manually to have 255 * everything in sync. 256 */ 257 if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && 258 (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && 259 skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) 260 return TX_CONTINUE; 261 262 if (local->hw.conf.flags & IEEE80211_CONF_PS) { 263 ieee80211_stop_queues_by_reason(&local->hw, 264 IEEE80211_MAX_QUEUE_MAP, 265 IEEE80211_QUEUE_STOP_REASON_PS, 266 false); 267 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; 268 ieee80211_queue_work(&local->hw, 269 &local->dynamic_ps_disable_work); 270 } 271 272 /* Don't restart the timer if we're not disassociated */ 273 if (!ifmgd->associated) 274 return TX_CONTINUE; 275 276 mod_timer(&local->dynamic_ps_timer, jiffies + 277 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); 278 279 return TX_CONTINUE; 280 } 281 282 static ieee80211_tx_result debug_noinline 283 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) 284 { 285 286 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 287 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 288 bool assoc = false; 289 290 if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) 291 return TX_CONTINUE; 292 293 if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && 294 test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && 295 !ieee80211_is_probe_req(hdr->frame_control) && 296 !ieee80211_is_any_nullfunc(hdr->frame_control)) 297 /* 298 * When software scanning only nullfunc frames (to notify 299 * the sleep state to the AP) and probe requests (for the 300 * active scan) are allowed, all other frames should not be 301 * sent and we should not get here, but if we do 302 * nonetheless, drop them to avoid sending them 303 * off-channel. See the link below and 304 * ieee80211_start_scan() for more. 305 * 306 * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 307 */ 308 return TX_DROP; 309 310 if (tx->sdata->vif.type == NL80211_IFTYPE_OCB) 311 return TX_CONTINUE; 312 313 if (tx->flags & IEEE80211_TX_PS_BUFFERED) 314 return TX_CONTINUE; 315 316 if (tx->sta) 317 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 318 319 if (likely(tx->flags & IEEE80211_TX_UNICAST)) { 320 if (unlikely(!assoc && 321 ieee80211_is_data(hdr->frame_control))) { 322 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 323 sdata_info(tx->sdata, 324 "dropped data frame to not associated station %pM\n", 325 hdr->addr1); 326 #endif 327 I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); 328 return TX_DROP; 329 } 330 } else if (unlikely(ieee80211_is_data(hdr->frame_control) && 331 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) { 332 /* 333 * No associated STAs - no need to send multicast 334 * frames. 335 */ 336 return TX_DROP; 337 } 338 339 return TX_CONTINUE; 340 } 341 342 /* This function is called whenever the AP is about to exceed the maximum limit 343 * of buffered frames for power saving STAs. This situation should not really 344 * happen often during normal operation, so dropping the oldest buffered packet 345 * from each queue should be OK to make some room for new frames. */ 346 static void purge_old_ps_buffers(struct ieee80211_local *local) 347 { 348 int total = 0, purged = 0; 349 struct sk_buff *skb; 350 struct ieee80211_sub_if_data *sdata; 351 struct sta_info *sta; 352 353 list_for_each_entry_rcu(sdata, &local->interfaces, list) { 354 struct ps_data *ps; 355 356 if (sdata->vif.type == NL80211_IFTYPE_AP) 357 ps = &sdata->u.ap.ps; 358 else if (ieee80211_vif_is_mesh(&sdata->vif)) 359 ps = &sdata->u.mesh.ps; 360 else 361 continue; 362 363 skb = skb_dequeue(&ps->bc_buf); 364 if (skb) { 365 purged++; 366 ieee80211_free_txskb(&local->hw, skb); 367 } 368 total += skb_queue_len(&ps->bc_buf); 369 } 370 371 /* 372 * Drop one frame from each station from the lowest-priority 373 * AC that has frames at all. 374 */ 375 list_for_each_entry_rcu(sta, &local->sta_list, list) { 376 int ac; 377 378 for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { 379 skb = skb_dequeue(&sta->ps_tx_buf[ac]); 380 total += skb_queue_len(&sta->ps_tx_buf[ac]); 381 if (skb) { 382 purged++; 383 ieee80211_free_txskb(&local->hw, skb); 384 break; 385 } 386 } 387 } 388 389 local->total_ps_buffered = total; 390 ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); 391 } 392 393 static ieee80211_tx_result 394 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) 395 { 396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 397 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 398 struct ps_data *ps; 399 400 /* 401 * broadcast/multicast frame 402 * 403 * If any of the associated/peer stations is in power save mode, 404 * the frame is buffered to be sent after DTIM beacon frame. 405 * This is done either by the hardware or us. 406 */ 407 408 /* powersaving STAs currently only in AP/VLAN/mesh mode */ 409 if (tx->sdata->vif.type == NL80211_IFTYPE_AP || 410 tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 411 if (!tx->sdata->bss) 412 return TX_CONTINUE; 413 414 ps = &tx->sdata->bss->ps; 415 } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { 416 ps = &tx->sdata->u.mesh.ps; 417 } else { 418 return TX_CONTINUE; 419 } 420 421 422 /* no buffering for ordered frames */ 423 if (ieee80211_has_order(hdr->frame_control)) 424 return TX_CONTINUE; 425 426 if (ieee80211_is_probe_req(hdr->frame_control)) 427 return TX_CONTINUE; 428 429 if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL)) 430 info->hw_queue = tx->sdata->vif.cab_queue; 431 432 /* no stations in PS mode and no buffered packets */ 433 if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf)) 434 return TX_CONTINUE; 435 436 info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; 437 438 /* device releases frame after DTIM beacon */ 439 if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING)) 440 return TX_CONTINUE; 441 442 /* buffered in mac80211 */ 443 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 444 purge_old_ps_buffers(tx->local); 445 446 if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { 447 ps_dbg(tx->sdata, 448 "BC TX buffer full - dropping the oldest frame\n"); 449 ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf)); 450 } else 451 tx->local->total_ps_buffered++; 452 453 skb_queue_tail(&ps->bc_buf, tx->skb); 454 455 return TX_QUEUED; 456 } 457 458 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, 459 struct sk_buff *skb) 460 { 461 if (!ieee80211_is_mgmt(fc)) 462 return 0; 463 464 if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) 465 return 0; 466 467 if (!ieee80211_is_robust_mgmt_frame(skb)) 468 return 0; 469 470 return 1; 471 } 472 473 static ieee80211_tx_result 474 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) 475 { 476 struct sta_info *sta = tx->sta; 477 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 478 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 479 struct ieee80211_local *local = tx->local; 480 481 if (unlikely(!sta)) 482 return TX_CONTINUE; 483 484 if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || 485 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 486 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) && 487 !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { 488 int ac = skb_get_queue_mapping(tx->skb); 489 490 if (ieee80211_is_mgmt(hdr->frame_control) && 491 !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) { 492 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; 493 return TX_CONTINUE; 494 } 495 496 ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", 497 sta->sta.addr, sta->sta.aid, ac); 498 if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) 499 purge_old_ps_buffers(tx->local); 500 501 /* sync with ieee80211_sta_ps_deliver_wakeup */ 502 spin_lock(&sta->ps_lock); 503 /* 504 * STA woke up the meantime and all the frames on ps_tx_buf have 505 * been queued to pending queue. No reordering can happen, go 506 * ahead and Tx the packet. 507 */ 508 if (!test_sta_flag(sta, WLAN_STA_PS_STA) && 509 !test_sta_flag(sta, WLAN_STA_PS_DRIVER) && 510 !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) { 511 spin_unlock(&sta->ps_lock); 512 return TX_CONTINUE; 513 } 514 515 if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { 516 struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); 517 ps_dbg(tx->sdata, 518 "STA %pM TX buffer for AC %d full - dropping oldest frame\n", 519 sta->sta.addr, ac); 520 ieee80211_free_txskb(&local->hw, old); 521 } else 522 tx->local->total_ps_buffered++; 523 524 info->control.jiffies = jiffies; 525 info->control.vif = &tx->sdata->vif; 526 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 527 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 528 skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); 529 spin_unlock(&sta->ps_lock); 530 531 if (!timer_pending(&local->sta_cleanup)) 532 mod_timer(&local->sta_cleanup, 533 round_jiffies(jiffies + 534 STA_INFO_CLEANUP_INTERVAL)); 535 536 /* 537 * We queued up some frames, so the TIM bit might 538 * need to be set, recalculate it. 539 */ 540 sta_info_recalc_tim(sta); 541 542 return TX_QUEUED; 543 } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { 544 ps_dbg(tx->sdata, 545 "STA %pM in PS mode, but polling/in SP -> send frame\n", 546 sta->sta.addr); 547 } 548 549 return TX_CONTINUE; 550 } 551 552 static ieee80211_tx_result debug_noinline 553 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) 554 { 555 if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) 556 return TX_CONTINUE; 557 558 if (tx->flags & IEEE80211_TX_UNICAST) 559 return ieee80211_tx_h_unicast_ps_buf(tx); 560 else 561 return ieee80211_tx_h_multicast_ps_buf(tx); 562 } 563 564 static ieee80211_tx_result debug_noinline 565 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) 566 { 567 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 568 569 if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { 570 if (tx->sdata->control_port_no_encrypt) 571 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 572 info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; 573 info->flags |= IEEE80211_TX_CTL_USE_MINRATE; 574 } 575 576 return TX_CONTINUE; 577 } 578 579 static ieee80211_tx_result debug_noinline 580 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) 581 { 582 struct ieee80211_key *key; 583 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 584 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 585 586 if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { 587 tx->key = NULL; 588 return TX_CONTINUE; 589 } 590 591 if (tx->sta && 592 (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) 593 tx->key = key; 594 else if (ieee80211_is_group_privacy_action(tx->skb) && 595 (key = rcu_dereference(tx->sdata->deflink.default_multicast_key))) 596 tx->key = key; 597 else if (ieee80211_is_mgmt(hdr->frame_control) && 598 is_multicast_ether_addr(hdr->addr1) && 599 ieee80211_is_robust_mgmt_frame(tx->skb) && 600 (key = rcu_dereference(tx->sdata->deflink.default_mgmt_key))) 601 tx->key = key; 602 else if (is_multicast_ether_addr(hdr->addr1) && 603 (key = rcu_dereference(tx->sdata->deflink.default_multicast_key))) 604 tx->key = key; 605 else if (!is_multicast_ether_addr(hdr->addr1) && 606 (key = rcu_dereference(tx->sdata->default_unicast_key))) 607 tx->key = key; 608 else 609 tx->key = NULL; 610 611 if (tx->key) { 612 bool skip_hw = false; 613 614 /* TODO: add threshold stuff again */ 615 616 switch (tx->key->conf.cipher) { 617 case WLAN_CIPHER_SUITE_WEP40: 618 case WLAN_CIPHER_SUITE_WEP104: 619 case WLAN_CIPHER_SUITE_TKIP: 620 if (!ieee80211_is_data_present(hdr->frame_control)) 621 tx->key = NULL; 622 break; 623 case WLAN_CIPHER_SUITE_CCMP: 624 case WLAN_CIPHER_SUITE_CCMP_256: 625 case WLAN_CIPHER_SUITE_GCMP: 626 case WLAN_CIPHER_SUITE_GCMP_256: 627 if (!ieee80211_is_data_present(hdr->frame_control) && 628 !ieee80211_use_mfp(hdr->frame_control, tx->sta, 629 tx->skb) && 630 !ieee80211_is_group_privacy_action(tx->skb)) 631 tx->key = NULL; 632 else 633 skip_hw = (tx->key->conf.flags & 634 IEEE80211_KEY_FLAG_SW_MGMT_TX) && 635 ieee80211_is_mgmt(hdr->frame_control); 636 break; 637 case WLAN_CIPHER_SUITE_AES_CMAC: 638 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 639 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 640 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 641 if (!ieee80211_is_mgmt(hdr->frame_control)) 642 tx->key = NULL; 643 break; 644 } 645 646 if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && 647 !ieee80211_is_deauth(hdr->frame_control))) 648 return TX_DROP; 649 650 if (!skip_hw && tx->key && 651 tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) 652 info->control.hw_key = &tx->key->conf; 653 } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta && 654 test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { 655 return TX_DROP; 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 encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP; 671 bool assoc = false; 672 673 memset(&txrc, 0, sizeof(txrc)); 674 675 sband = tx->local->hw.wiphy->bands[info->band]; 676 677 len = min_t(u32, tx->skb->len + FCS_LEN, 678 tx->local->hw.wiphy->frag_threshold); 679 680 /* set up the tx rate control struct we give the RC algo */ 681 txrc.hw = &tx->local->hw; 682 txrc.sband = sband; 683 txrc.bss_conf = &tx->sdata->vif.bss_conf; 684 txrc.skb = tx->skb; 685 txrc.reported_rate.idx = -1; 686 txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; 687 688 if (tx->sdata->rc_has_mcs_mask[info->band]) 689 txrc.rate_idx_mcs_mask = 690 tx->sdata->rc_rateidx_mcs_mask[info->band]; 691 692 txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || 693 tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || 694 tx->sdata->vif.type == NL80211_IFTYPE_ADHOC || 695 tx->sdata->vif.type == NL80211_IFTYPE_OCB); 696 697 /* set up RTS protection if desired */ 698 if (len > tx->local->hw.wiphy->rts_threshold) { 699 txrc.rts = true; 700 } 701 702 info->control.use_rts = txrc.rts; 703 info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; 704 705 /* 706 * Use short preamble if the BSS can handle it, but not for 707 * management frames unless we know the receiver can handle 708 * that -- the management frame might be to a station that 709 * just wants a probe response. 710 */ 711 if (tx->sdata->vif.bss_conf.use_short_preamble && 712 (ieee80211_is_tx_data(tx->skb) || 713 (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) 714 txrc.short_preamble = true; 715 716 info->control.short_preamble = txrc.short_preamble; 717 718 /* don't ask rate control when rate already injected via radiotap */ 719 if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT) 720 return TX_CONTINUE; 721 722 if (tx->sta) 723 assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); 724 725 /* 726 * Lets not bother rate control if we're associated and cannot 727 * talk to the sta. This should not happen. 728 */ 729 if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && 730 !rate_usable_index_exists(sband, &tx->sta->sta), 731 "%s: Dropped data frame as no usable bitrate found while " 732 "scanning and associated. Target station: " 733 "%pM on %d GHz band\n", 734 tx->sdata->name, 735 encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1, 736 info->band ? 5 : 2)) 737 return TX_DROP; 738 739 /* 740 * If we're associated with the sta at this point we know we can at 741 * least send the frame at the lowest bit rate. 742 */ 743 rate_control_get_rate(tx->sdata, tx->sta, &txrc); 744 745 if (tx->sta && !info->control.skip_table) 746 ratetbl = rcu_dereference(tx->sta->sta.rates); 747 748 if (unlikely(info->control.rates[0].idx < 0)) { 749 if (ratetbl) { 750 struct ieee80211_tx_rate rate = { 751 .idx = ratetbl->rate[0].idx, 752 .flags = ratetbl->rate[0].flags, 753 .count = ratetbl->rate[0].count 754 }; 755 756 if (ratetbl->rate[0].idx < 0) 757 return TX_DROP; 758 759 tx->rate = rate; 760 } else { 761 return TX_DROP; 762 } 763 } else { 764 tx->rate = info->control.rates[0]; 765 } 766 767 if (txrc.reported_rate.idx < 0) { 768 txrc.reported_rate = tx->rate; 769 if (tx->sta && ieee80211_is_tx_data(tx->skb)) 770 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 771 } else if (tx->sta) 772 tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate; 773 774 if (ratetbl) 775 return TX_CONTINUE; 776 777 if (unlikely(!info->control.rates[0].count)) 778 info->control.rates[0].count = 1; 779 780 if (WARN_ON_ONCE((info->control.rates[0].count > 1) && 781 (info->flags & IEEE80211_TX_CTL_NO_ACK))) 782 info->control.rates[0].count = 1; 783 784 return TX_CONTINUE; 785 } 786 787 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid) 788 { 789 u16 *seq = &sta->tid_seq[tid]; 790 __le16 ret = cpu_to_le16(*seq); 791 792 /* Increase the sequence number. */ 793 *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; 794 795 return ret; 796 } 797 798 static ieee80211_tx_result debug_noinline 799 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) 800 { 801 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 802 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; 803 int tid; 804 805 /* 806 * Packet injection may want to control the sequence 807 * number, if we have no matching interface then we 808 * neither assign one ourselves nor ask the driver to. 809 */ 810 if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) 811 return TX_CONTINUE; 812 813 if (unlikely(ieee80211_is_ctl(hdr->frame_control))) 814 return TX_CONTINUE; 815 816 if (ieee80211_hdrlen(hdr->frame_control) < 24) 817 return TX_CONTINUE; 818 819 if (ieee80211_is_qos_nullfunc(hdr->frame_control)) 820 return TX_CONTINUE; 821 822 if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO) 823 return TX_CONTINUE; 824 825 /* 826 * Anything but QoS data that has a sequence number field 827 * (is long enough) gets a sequence number from the global 828 * counter. QoS data frames with a multicast destination 829 * also use the global counter (802.11-2012 9.3.2.10). 830 */ 831 if (!ieee80211_is_data_qos(hdr->frame_control) || 832 is_multicast_ether_addr(hdr->addr1)) { 833 /* driver should assign sequence number */ 834 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 835 /* for pure STA mode without beacons, we can do it */ 836 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 837 tx->sdata->sequence_number += 0x10; 838 if (tx->sta) 839 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 840 return TX_CONTINUE; 841 } 842 843 /* 844 * This should be true for injected/management frames only, for 845 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 846 * above since they are not QoS-data frames. 847 */ 848 if (!tx->sta) 849 return TX_CONTINUE; 850 851 /* include per-STA, per-TID sequence counter */ 852 tid = ieee80211_get_tid(hdr); 853 tx->sta->deflink.tx_stats.msdu[tid]++; 854 855 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 856 857 return TX_CONTINUE; 858 } 859 860 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 861 struct sk_buff *skb, int hdrlen, 862 int frag_threshold) 863 { 864 struct ieee80211_local *local = tx->local; 865 struct ieee80211_tx_info *info; 866 struct sk_buff *tmp; 867 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 868 int pos = hdrlen + per_fragm; 869 int rem = skb->len - hdrlen - per_fragm; 870 871 if (WARN_ON(rem < 0)) 872 return -EINVAL; 873 874 /* first fragment was already added to queue by caller */ 875 876 while (rem) { 877 int fraglen = per_fragm; 878 879 if (fraglen > rem) 880 fraglen = rem; 881 rem -= fraglen; 882 tmp = dev_alloc_skb(local->tx_headroom + 883 frag_threshold + 884 IEEE80211_ENCRYPT_HEADROOM + 885 IEEE80211_ENCRYPT_TAILROOM); 886 if (!tmp) 887 return -ENOMEM; 888 889 __skb_queue_tail(&tx->skbs, tmp); 890 891 skb_reserve(tmp, 892 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 893 894 /* copy control information */ 895 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 896 897 info = IEEE80211_SKB_CB(tmp); 898 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 899 IEEE80211_TX_CTL_FIRST_FRAGMENT); 900 901 if (rem) 902 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 903 904 skb_copy_queue_mapping(tmp, skb); 905 tmp->priority = skb->priority; 906 tmp->dev = skb->dev; 907 908 /* copy header and data */ 909 skb_put_data(tmp, skb->data, hdrlen); 910 skb_put_data(tmp, skb->data + pos, fraglen); 911 912 pos += fraglen; 913 } 914 915 /* adjust first fragment's length */ 916 skb_trim(skb, hdrlen + per_fragm); 917 return 0; 918 } 919 920 static ieee80211_tx_result debug_noinline 921 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 922 { 923 struct sk_buff *skb = tx->skb; 924 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 925 struct ieee80211_hdr *hdr = (void *)skb->data; 926 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 927 int hdrlen; 928 int fragnum; 929 930 /* no matter what happens, tx->skb moves to tx->skbs */ 931 __skb_queue_tail(&tx->skbs, skb); 932 tx->skb = NULL; 933 934 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 935 return TX_CONTINUE; 936 937 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 938 return TX_CONTINUE; 939 940 /* 941 * Warn when submitting a fragmented A-MPDU frame and drop it. 942 * This scenario is handled in ieee80211_tx_prepare but extra 943 * caution taken here as fragmented ampdu may cause Tx stop. 944 */ 945 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 946 return TX_DROP; 947 948 hdrlen = ieee80211_hdrlen(hdr->frame_control); 949 950 /* internal error, why isn't DONTFRAG set? */ 951 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 952 return TX_DROP; 953 954 /* 955 * Now fragment the frame. This will allocate all the fragments and 956 * chain them (using skb as the first fragment) to skb->next. 957 * During transmission, we will remove the successfully transmitted 958 * fragments from this list. When the low-level driver rejects one 959 * of the fragments then we will simply pretend to accept the skb 960 * but store it away as pending. 961 */ 962 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 963 return TX_DROP; 964 965 /* update duration/seq/flags of fragments */ 966 fragnum = 0; 967 968 skb_queue_walk(&tx->skbs, skb) { 969 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 970 971 hdr = (void *)skb->data; 972 info = IEEE80211_SKB_CB(skb); 973 974 if (!skb_queue_is_last(&tx->skbs, skb)) { 975 hdr->frame_control |= morefrags; 976 /* 977 * No multi-rate retries for fragmented frames, that 978 * would completely throw off the NAV at other STAs. 979 */ 980 info->control.rates[1].idx = -1; 981 info->control.rates[2].idx = -1; 982 info->control.rates[3].idx = -1; 983 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 984 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 985 } else { 986 hdr->frame_control &= ~morefrags; 987 } 988 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 989 fragnum++; 990 } 991 992 return TX_CONTINUE; 993 } 994 995 static ieee80211_tx_result debug_noinline 996 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 997 { 998 struct sk_buff *skb; 999 int ac = -1; 1000 1001 if (!tx->sta) 1002 return TX_CONTINUE; 1003 1004 skb_queue_walk(&tx->skbs, skb) { 1005 ac = skb_get_queue_mapping(skb); 1006 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1007 } 1008 if (ac >= 0) 1009 tx->sta->deflink.tx_stats.packets[ac]++; 1010 1011 return TX_CONTINUE; 1012 } 1013 1014 static ieee80211_tx_result debug_noinline 1015 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1016 { 1017 if (!tx->key) 1018 return TX_CONTINUE; 1019 1020 switch (tx->key->conf.cipher) { 1021 case WLAN_CIPHER_SUITE_WEP40: 1022 case WLAN_CIPHER_SUITE_WEP104: 1023 return ieee80211_crypto_wep_encrypt(tx); 1024 case WLAN_CIPHER_SUITE_TKIP: 1025 return ieee80211_crypto_tkip_encrypt(tx); 1026 case WLAN_CIPHER_SUITE_CCMP: 1027 return ieee80211_crypto_ccmp_encrypt( 1028 tx, IEEE80211_CCMP_MIC_LEN); 1029 case WLAN_CIPHER_SUITE_CCMP_256: 1030 return ieee80211_crypto_ccmp_encrypt( 1031 tx, IEEE80211_CCMP_256_MIC_LEN); 1032 case WLAN_CIPHER_SUITE_AES_CMAC: 1033 return ieee80211_crypto_aes_cmac_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1035 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1037 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1038 return ieee80211_crypto_aes_gmac_encrypt(tx); 1039 case WLAN_CIPHER_SUITE_GCMP: 1040 case WLAN_CIPHER_SUITE_GCMP_256: 1041 return ieee80211_crypto_gcmp_encrypt(tx); 1042 } 1043 1044 return TX_DROP; 1045 } 1046 1047 static ieee80211_tx_result debug_noinline 1048 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1049 { 1050 struct sk_buff *skb; 1051 struct ieee80211_hdr *hdr; 1052 int next_len; 1053 bool group_addr; 1054 1055 skb_queue_walk(&tx->skbs, skb) { 1056 hdr = (void *) skb->data; 1057 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1058 break; /* must not overwrite AID */ 1059 if (!skb_queue_is_last(&tx->skbs, skb)) { 1060 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1061 next_len = next->len; 1062 } else 1063 next_len = 0; 1064 group_addr = is_multicast_ether_addr(hdr->addr1); 1065 1066 hdr->duration_id = 1067 ieee80211_duration(tx, skb, group_addr, next_len); 1068 } 1069 1070 return TX_CONTINUE; 1071 } 1072 1073 /* actual transmit path */ 1074 1075 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1076 struct sk_buff *skb, 1077 struct ieee80211_tx_info *info, 1078 struct tid_ampdu_tx *tid_tx, 1079 int tid) 1080 { 1081 bool queued = false; 1082 bool reset_agg_timer = false; 1083 struct sk_buff *purge_skb = NULL; 1084 1085 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1086 info->flags |= IEEE80211_TX_CTL_AMPDU; 1087 reset_agg_timer = true; 1088 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1089 /* 1090 * nothing -- this aggregation session is being started 1091 * but that might still fail with the driver 1092 */ 1093 } else if (!tx->sta->sta.txq[tid]) { 1094 spin_lock(&tx->sta->lock); 1095 /* 1096 * Need to re-check now, because we may get here 1097 * 1098 * 1) in the window during which the setup is actually 1099 * already done, but not marked yet because not all 1100 * packets are spliced over to the driver pending 1101 * queue yet -- if this happened we acquire the lock 1102 * either before or after the splice happens, but 1103 * need to recheck which of these cases happened. 1104 * 1105 * 2) during session teardown, if the OPERATIONAL bit 1106 * was cleared due to the teardown but the pointer 1107 * hasn't been assigned NULL yet (or we loaded it 1108 * before it was assigned) -- in this case it may 1109 * now be NULL which means we should just let the 1110 * packet pass through because splicing the frames 1111 * back is already done. 1112 */ 1113 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1114 1115 if (!tid_tx) { 1116 /* do nothing, let packet pass through */ 1117 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1118 info->flags |= IEEE80211_TX_CTL_AMPDU; 1119 reset_agg_timer = true; 1120 } else { 1121 queued = true; 1122 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1123 clear_sta_flag(tx->sta, WLAN_STA_SP); 1124 ps_dbg(tx->sta->sdata, 1125 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1126 tx->sta->sta.addr, tx->sta->sta.aid); 1127 } 1128 info->control.vif = &tx->sdata->vif; 1129 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1130 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1131 __skb_queue_tail(&tid_tx->pending, skb); 1132 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1133 purge_skb = __skb_dequeue(&tid_tx->pending); 1134 } 1135 spin_unlock(&tx->sta->lock); 1136 1137 if (purge_skb) 1138 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1139 } 1140 1141 /* reset session timer */ 1142 if (reset_agg_timer) 1143 tid_tx->last_tx = jiffies; 1144 1145 return queued; 1146 } 1147 1148 static void 1149 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1150 struct sta_info *sta, 1151 struct sk_buff *skb) 1152 { 1153 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1154 u16 tid; 1155 1156 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1157 return; 1158 1159 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1160 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1161 skb->protocol == sdata->control_port_protocol) 1162 return; 1163 1164 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1165 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1166 return; 1167 1168 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1169 } 1170 1171 /* 1172 * initialises @tx 1173 * pass %NULL for the station if unknown, a valid pointer if known 1174 * or an ERR_PTR() if the station is known not to exist 1175 */ 1176 static ieee80211_tx_result 1177 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1178 struct ieee80211_tx_data *tx, 1179 struct sta_info *sta, struct sk_buff *skb) 1180 { 1181 struct ieee80211_local *local = sdata->local; 1182 struct ieee80211_hdr *hdr; 1183 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1184 bool aggr_check = false; 1185 int tid; 1186 1187 memset(tx, 0, sizeof(*tx)); 1188 tx->skb = skb; 1189 tx->local = local; 1190 tx->sdata = sdata; 1191 __skb_queue_head_init(&tx->skbs); 1192 1193 /* 1194 * If this flag is set to true anywhere, and we get here, 1195 * we are doing the needed processing, so remove the flag 1196 * now. 1197 */ 1198 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1199 1200 hdr = (struct ieee80211_hdr *) skb->data; 1201 1202 if (likely(sta)) { 1203 if (!IS_ERR(sta)) 1204 tx->sta = sta; 1205 } else { 1206 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1207 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1208 if (!tx->sta && sdata->wdev.use_4addr) 1209 return TX_DROP; 1210 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1211 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1212 } 1213 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1214 tx->sta = sta_info_get(sdata, hdr->addr1); 1215 aggr_check = true; 1216 } 1217 } 1218 1219 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1220 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1221 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1222 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1223 struct tid_ampdu_tx *tid_tx; 1224 1225 tid = ieee80211_get_tid(hdr); 1226 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1227 if (!tid_tx && aggr_check) { 1228 ieee80211_aggr_check(sdata, tx->sta, skb); 1229 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1230 } 1231 1232 if (tid_tx) { 1233 bool queued; 1234 1235 queued = ieee80211_tx_prep_agg(tx, skb, info, 1236 tid_tx, tid); 1237 1238 if (unlikely(queued)) 1239 return TX_QUEUED; 1240 } 1241 } 1242 1243 if (is_multicast_ether_addr(hdr->addr1)) { 1244 tx->flags &= ~IEEE80211_TX_UNICAST; 1245 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1246 } else 1247 tx->flags |= IEEE80211_TX_UNICAST; 1248 1249 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1250 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1251 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1252 info->flags & IEEE80211_TX_CTL_AMPDU) 1253 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1254 } 1255 1256 if (!tx->sta) 1257 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1258 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1259 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1260 ieee80211_check_fast_xmit(tx->sta); 1261 } 1262 1263 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1264 1265 return TX_CONTINUE; 1266 } 1267 1268 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1269 struct ieee80211_vif *vif, 1270 struct sta_info *sta, 1271 struct sk_buff *skb) 1272 { 1273 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1274 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1275 struct ieee80211_txq *txq = NULL; 1276 1277 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1278 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1279 return NULL; 1280 1281 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1282 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1283 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1284 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1285 vif->type == NL80211_IFTYPE_STATION) && 1286 sta && sta->uploaded) { 1287 /* 1288 * This will be NULL if the driver didn't set the 1289 * opt-in hardware flag. 1290 */ 1291 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1292 } 1293 } else if (sta) { 1294 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1295 1296 if (!sta->uploaded) 1297 return NULL; 1298 1299 txq = sta->sta.txq[tid]; 1300 } else if (vif) { 1301 txq = vif->txq; 1302 } 1303 1304 if (!txq) 1305 return NULL; 1306 1307 return to_txq_info(txq); 1308 } 1309 1310 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1311 { 1312 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1313 } 1314 1315 static u32 codel_skb_len_func(const struct sk_buff *skb) 1316 { 1317 return skb->len; 1318 } 1319 1320 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1321 { 1322 const struct ieee80211_tx_info *info; 1323 1324 info = (const struct ieee80211_tx_info *)skb->cb; 1325 return info->control.enqueue_time; 1326 } 1327 1328 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1329 void *ctx) 1330 { 1331 struct ieee80211_local *local; 1332 struct txq_info *txqi; 1333 struct fq *fq; 1334 struct fq_flow *flow; 1335 1336 txqi = ctx; 1337 local = vif_to_sdata(txqi->txq.vif)->local; 1338 fq = &local->fq; 1339 1340 if (cvars == &txqi->def_cvars) 1341 flow = &txqi->tin.default_flow; 1342 else 1343 flow = &fq->flows[cvars - local->cvars]; 1344 1345 return fq_flow_dequeue(fq, flow); 1346 } 1347 1348 static void codel_drop_func(struct sk_buff *skb, 1349 void *ctx) 1350 { 1351 struct ieee80211_local *local; 1352 struct ieee80211_hw *hw; 1353 struct txq_info *txqi; 1354 1355 txqi = ctx; 1356 local = vif_to_sdata(txqi->txq.vif)->local; 1357 hw = &local->hw; 1358 1359 ieee80211_free_txskb(hw, skb); 1360 } 1361 1362 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1363 struct fq_tin *tin, 1364 struct fq_flow *flow) 1365 { 1366 struct ieee80211_local *local; 1367 struct txq_info *txqi; 1368 struct codel_vars *cvars; 1369 struct codel_params *cparams; 1370 struct codel_stats *cstats; 1371 1372 local = container_of(fq, struct ieee80211_local, fq); 1373 txqi = container_of(tin, struct txq_info, tin); 1374 cstats = &txqi->cstats; 1375 1376 if (txqi->txq.sta) { 1377 struct sta_info *sta = container_of(txqi->txq.sta, 1378 struct sta_info, sta); 1379 cparams = &sta->cparams; 1380 } else { 1381 cparams = &local->cparams; 1382 } 1383 1384 if (flow == &tin->default_flow) 1385 cvars = &txqi->def_cvars; 1386 else 1387 cvars = &local->cvars[flow - fq->flows]; 1388 1389 return codel_dequeue(txqi, 1390 &flow->backlog, 1391 cparams, 1392 cvars, 1393 cstats, 1394 codel_skb_len_func, 1395 codel_skb_time_func, 1396 codel_drop_func, 1397 codel_dequeue_func); 1398 } 1399 1400 static void fq_skb_free_func(struct fq *fq, 1401 struct fq_tin *tin, 1402 struct fq_flow *flow, 1403 struct sk_buff *skb) 1404 { 1405 struct ieee80211_local *local; 1406 1407 local = container_of(fq, struct ieee80211_local, fq); 1408 ieee80211_free_txskb(&local->hw, skb); 1409 } 1410 1411 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1412 struct txq_info *txqi, 1413 struct sk_buff *skb) 1414 { 1415 struct fq *fq = &local->fq; 1416 struct fq_tin *tin = &txqi->tin; 1417 u32 flow_idx = fq_flow_idx(fq, skb); 1418 1419 ieee80211_set_skb_enqueue_time(skb); 1420 1421 spin_lock_bh(&fq->lock); 1422 /* 1423 * For management frames, don't really apply codel etc., 1424 * we don't want to apply any shaping or anything we just 1425 * want to simplify the driver API by having them on the 1426 * txqi. 1427 */ 1428 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1429 IEEE80211_SKB_CB(skb)->control.flags |= 1430 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1431 __skb_queue_tail(&txqi->frags, skb); 1432 } else { 1433 fq_tin_enqueue(fq, tin, flow_idx, skb, 1434 fq_skb_free_func); 1435 } 1436 spin_unlock_bh(&fq->lock); 1437 } 1438 1439 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1440 struct fq_flow *flow, struct sk_buff *skb, 1441 void *data) 1442 { 1443 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1444 1445 return info->control.vif == data; 1446 } 1447 1448 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1449 struct ieee80211_sub_if_data *sdata) 1450 { 1451 struct fq *fq = &local->fq; 1452 struct txq_info *txqi; 1453 struct fq_tin *tin; 1454 struct ieee80211_sub_if_data *ap; 1455 1456 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1457 return; 1458 1459 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1460 1461 if (!ap->vif.txq) 1462 return; 1463 1464 txqi = to_txq_info(ap->vif.txq); 1465 tin = &txqi->tin; 1466 1467 spin_lock_bh(&fq->lock); 1468 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1469 fq_skb_free_func); 1470 spin_unlock_bh(&fq->lock); 1471 } 1472 1473 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1474 struct sta_info *sta, 1475 struct txq_info *txqi, int tid) 1476 { 1477 fq_tin_init(&txqi->tin); 1478 codel_vars_init(&txqi->def_cvars); 1479 codel_stats_init(&txqi->cstats); 1480 __skb_queue_head_init(&txqi->frags); 1481 INIT_LIST_HEAD(&txqi->schedule_order); 1482 1483 txqi->txq.vif = &sdata->vif; 1484 1485 if (!sta) { 1486 sdata->vif.txq = &txqi->txq; 1487 txqi->txq.tid = 0; 1488 txqi->txq.ac = IEEE80211_AC_BE; 1489 1490 return; 1491 } 1492 1493 if (tid == IEEE80211_NUM_TIDS) { 1494 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1495 /* Drivers need to opt in to the management MPDU TXQ */ 1496 if (!ieee80211_hw_check(&sdata->local->hw, 1497 STA_MMPDU_TXQ)) 1498 return; 1499 } else if (!ieee80211_hw_check(&sdata->local->hw, 1500 BUFF_MMPDU_TXQ)) { 1501 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1502 return; 1503 } 1504 txqi->txq.ac = IEEE80211_AC_VO; 1505 } else { 1506 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1507 } 1508 1509 txqi->txq.sta = &sta->sta; 1510 txqi->txq.tid = tid; 1511 sta->sta.txq[tid] = &txqi->txq; 1512 } 1513 1514 void ieee80211_txq_purge(struct ieee80211_local *local, 1515 struct txq_info *txqi) 1516 { 1517 struct fq *fq = &local->fq; 1518 struct fq_tin *tin = &txqi->tin; 1519 1520 spin_lock_bh(&fq->lock); 1521 fq_tin_reset(fq, tin, fq_skb_free_func); 1522 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1523 spin_unlock_bh(&fq->lock); 1524 1525 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1526 list_del_init(&txqi->schedule_order); 1527 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1528 } 1529 1530 void ieee80211_txq_set_params(struct ieee80211_local *local) 1531 { 1532 if (local->hw.wiphy->txq_limit) 1533 local->fq.limit = local->hw.wiphy->txq_limit; 1534 else 1535 local->hw.wiphy->txq_limit = local->fq.limit; 1536 1537 if (local->hw.wiphy->txq_memory_limit) 1538 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1539 else 1540 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1541 1542 if (local->hw.wiphy->txq_quantum) 1543 local->fq.quantum = local->hw.wiphy->txq_quantum; 1544 else 1545 local->hw.wiphy->txq_quantum = local->fq.quantum; 1546 } 1547 1548 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1549 { 1550 struct fq *fq = &local->fq; 1551 int ret; 1552 int i; 1553 bool supp_vht = false; 1554 enum nl80211_band band; 1555 1556 if (!local->ops->wake_tx_queue) 1557 return 0; 1558 1559 ret = fq_init(fq, 4096); 1560 if (ret) 1561 return ret; 1562 1563 /* 1564 * If the hardware doesn't support VHT, it is safe to limit the maximum 1565 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1566 */ 1567 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1568 struct ieee80211_supported_band *sband; 1569 1570 sband = local->hw.wiphy->bands[band]; 1571 if (!sband) 1572 continue; 1573 1574 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1575 } 1576 1577 if (!supp_vht) 1578 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1579 1580 codel_params_init(&local->cparams); 1581 local->cparams.interval = MS2TIME(100); 1582 local->cparams.target = MS2TIME(20); 1583 local->cparams.ecn = true; 1584 1585 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1586 GFP_KERNEL); 1587 if (!local->cvars) { 1588 spin_lock_bh(&fq->lock); 1589 fq_reset(fq, fq_skb_free_func); 1590 spin_unlock_bh(&fq->lock); 1591 return -ENOMEM; 1592 } 1593 1594 for (i = 0; i < fq->flows_cnt; i++) 1595 codel_vars_init(&local->cvars[i]); 1596 1597 ieee80211_txq_set_params(local); 1598 1599 return 0; 1600 } 1601 1602 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1603 { 1604 struct fq *fq = &local->fq; 1605 1606 if (!local->ops->wake_tx_queue) 1607 return; 1608 1609 kfree(local->cvars); 1610 local->cvars = NULL; 1611 1612 spin_lock_bh(&fq->lock); 1613 fq_reset(fq, fq_skb_free_func); 1614 spin_unlock_bh(&fq->lock); 1615 } 1616 1617 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1618 struct ieee80211_sub_if_data *sdata, 1619 struct sta_info *sta, 1620 struct sk_buff *skb) 1621 { 1622 struct ieee80211_vif *vif; 1623 struct txq_info *txqi; 1624 1625 if (!local->ops->wake_tx_queue || 1626 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1627 return false; 1628 1629 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1630 sdata = container_of(sdata->bss, 1631 struct ieee80211_sub_if_data, u.ap); 1632 1633 vif = &sdata->vif; 1634 txqi = ieee80211_get_txq(local, vif, sta, skb); 1635 1636 if (!txqi) 1637 return false; 1638 1639 ieee80211_txq_enqueue(local, txqi, skb); 1640 1641 schedule_and_wake_txq(local, txqi); 1642 1643 return true; 1644 } 1645 1646 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1647 struct ieee80211_vif *vif, 1648 struct sta_info *sta, 1649 struct sk_buff_head *skbs, 1650 bool txpending) 1651 { 1652 struct ieee80211_tx_control control = {}; 1653 struct sk_buff *skb, *tmp; 1654 unsigned long flags; 1655 1656 skb_queue_walk_safe(skbs, skb, tmp) { 1657 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1658 int q = info->hw_queue; 1659 1660 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1661 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1662 __skb_unlink(skb, skbs); 1663 ieee80211_free_txskb(&local->hw, skb); 1664 continue; 1665 } 1666 #endif 1667 1668 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1669 if (local->queue_stop_reasons[q] || 1670 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1671 if (unlikely(info->flags & 1672 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1673 if (local->queue_stop_reasons[q] & 1674 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1675 /* 1676 * Drop off-channel frames if queues 1677 * are stopped for any reason other 1678 * than off-channel operation. Never 1679 * queue them. 1680 */ 1681 spin_unlock_irqrestore( 1682 &local->queue_stop_reason_lock, 1683 flags); 1684 ieee80211_purge_tx_queue(&local->hw, 1685 skbs); 1686 return true; 1687 } 1688 } else { 1689 1690 /* 1691 * Since queue is stopped, queue up frames for 1692 * later transmission from the tx-pending 1693 * tasklet when the queue is woken again. 1694 */ 1695 if (txpending) 1696 skb_queue_splice_init(skbs, 1697 &local->pending[q]); 1698 else 1699 skb_queue_splice_tail_init(skbs, 1700 &local->pending[q]); 1701 1702 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1703 flags); 1704 return false; 1705 } 1706 } 1707 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1708 1709 info->control.vif = vif; 1710 control.sta = sta ? &sta->sta : NULL; 1711 1712 __skb_unlink(skb, skbs); 1713 drv_tx(local, &control, skb); 1714 } 1715 1716 return true; 1717 } 1718 1719 /* 1720 * Returns false if the frame couldn't be transmitted but was queued instead. 1721 */ 1722 static bool __ieee80211_tx(struct ieee80211_local *local, 1723 struct sk_buff_head *skbs, struct sta_info *sta, 1724 bool txpending) 1725 { 1726 struct ieee80211_tx_info *info; 1727 struct ieee80211_sub_if_data *sdata; 1728 struct ieee80211_vif *vif; 1729 struct sk_buff *skb; 1730 bool result; 1731 1732 if (WARN_ON(skb_queue_empty(skbs))) 1733 return true; 1734 1735 skb = skb_peek(skbs); 1736 info = IEEE80211_SKB_CB(skb); 1737 sdata = vif_to_sdata(info->control.vif); 1738 if (sta && !sta->uploaded) 1739 sta = NULL; 1740 1741 switch (sdata->vif.type) { 1742 case NL80211_IFTYPE_MONITOR: 1743 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1744 vif = &sdata->vif; 1745 break; 1746 } 1747 sdata = rcu_dereference(local->monitor_sdata); 1748 if (sdata) { 1749 vif = &sdata->vif; 1750 info->hw_queue = 1751 vif->hw_queue[skb_get_queue_mapping(skb)]; 1752 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1753 ieee80211_purge_tx_queue(&local->hw, skbs); 1754 return true; 1755 } else 1756 vif = NULL; 1757 break; 1758 case NL80211_IFTYPE_AP_VLAN: 1759 sdata = container_of(sdata->bss, 1760 struct ieee80211_sub_if_data, u.ap); 1761 fallthrough; 1762 default: 1763 vif = &sdata->vif; 1764 break; 1765 } 1766 1767 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1768 1769 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1770 1771 return result; 1772 } 1773 1774 /* 1775 * Invoke TX handlers, return 0 on success and non-zero if the 1776 * frame was dropped or queued. 1777 * 1778 * The handlers are split into an early and late part. The latter is everything 1779 * that can be sensitive to reordering, and will be deferred to after packets 1780 * are dequeued from the intermediate queues (when they are enabled). 1781 */ 1782 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1783 { 1784 ieee80211_tx_result res = TX_DROP; 1785 1786 #define CALL_TXH(txh) \ 1787 do { \ 1788 res = txh(tx); \ 1789 if (res != TX_CONTINUE) \ 1790 goto txh_done; \ 1791 } while (0) 1792 1793 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1794 CALL_TXH(ieee80211_tx_h_check_assoc); 1795 CALL_TXH(ieee80211_tx_h_ps_buf); 1796 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1797 CALL_TXH(ieee80211_tx_h_select_key); 1798 1799 txh_done: 1800 if (unlikely(res == TX_DROP)) { 1801 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1802 if (tx->skb) 1803 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1804 else 1805 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1806 return -1; 1807 } else if (unlikely(res == TX_QUEUED)) { 1808 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1809 return -1; 1810 } 1811 1812 return 0; 1813 } 1814 1815 /* 1816 * Late handlers can be called while the sta lock is held. Handlers that can 1817 * cause packets to be generated will cause deadlock! 1818 */ 1819 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1820 { 1821 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1822 ieee80211_tx_result res = TX_CONTINUE; 1823 1824 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1825 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1826 1827 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1828 __skb_queue_tail(&tx->skbs, tx->skb); 1829 tx->skb = NULL; 1830 goto txh_done; 1831 } 1832 1833 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1834 CALL_TXH(ieee80211_tx_h_sequence); 1835 CALL_TXH(ieee80211_tx_h_fragment); 1836 /* handlers after fragment must be aware of tx info fragmentation! */ 1837 CALL_TXH(ieee80211_tx_h_stats); 1838 CALL_TXH(ieee80211_tx_h_encrypt); 1839 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1840 CALL_TXH(ieee80211_tx_h_calculate_duration); 1841 #undef CALL_TXH 1842 1843 txh_done: 1844 if (unlikely(res == TX_DROP)) { 1845 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1846 if (tx->skb) 1847 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1848 else 1849 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1850 return -1; 1851 } else if (unlikely(res == TX_QUEUED)) { 1852 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1853 return -1; 1854 } 1855 1856 return 0; 1857 } 1858 1859 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1860 { 1861 int r = invoke_tx_handlers_early(tx); 1862 1863 if (r) 1864 return r; 1865 return invoke_tx_handlers_late(tx); 1866 } 1867 1868 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1869 struct ieee80211_vif *vif, struct sk_buff *skb, 1870 int band, struct ieee80211_sta **sta) 1871 { 1872 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1873 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1874 struct ieee80211_tx_data tx; 1875 struct sk_buff *skb2; 1876 1877 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1878 return false; 1879 1880 info->band = band; 1881 info->control.vif = vif; 1882 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1883 1884 if (invoke_tx_handlers(&tx)) 1885 return false; 1886 1887 if (sta) { 1888 if (tx.sta) 1889 *sta = &tx.sta->sta; 1890 else 1891 *sta = NULL; 1892 } 1893 1894 /* this function isn't suitable for fragmented data frames */ 1895 skb2 = __skb_dequeue(&tx.skbs); 1896 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1897 ieee80211_free_txskb(hw, skb2); 1898 ieee80211_purge_tx_queue(hw, &tx.skbs); 1899 return false; 1900 } 1901 1902 return true; 1903 } 1904 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1905 1906 /* 1907 * Returns false if the frame couldn't be transmitted but was queued instead. 1908 */ 1909 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1910 struct sta_info *sta, struct sk_buff *skb, 1911 bool txpending) 1912 { 1913 struct ieee80211_local *local = sdata->local; 1914 struct ieee80211_tx_data tx; 1915 ieee80211_tx_result res_prepare; 1916 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1917 bool result = true; 1918 1919 if (unlikely(skb->len < 10)) { 1920 dev_kfree_skb(skb); 1921 return true; 1922 } 1923 1924 /* initialises tx */ 1925 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1926 1927 if (unlikely(res_prepare == TX_DROP)) { 1928 ieee80211_free_txskb(&local->hw, skb); 1929 return true; 1930 } else if (unlikely(res_prepare == TX_QUEUED)) { 1931 return true; 1932 } 1933 1934 /* set up hw_queue value early */ 1935 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1936 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1937 info->hw_queue = 1938 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1939 1940 if (invoke_tx_handlers_early(&tx)) 1941 return true; 1942 1943 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1944 return true; 1945 1946 if (!invoke_tx_handlers_late(&tx)) 1947 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1948 1949 return result; 1950 } 1951 1952 /* device xmit handlers */ 1953 1954 enum ieee80211_encrypt { 1955 ENCRYPT_NO, 1956 ENCRYPT_MGMT, 1957 ENCRYPT_DATA, 1958 }; 1959 1960 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1961 struct sk_buff *skb, 1962 int head_need, 1963 enum ieee80211_encrypt encrypt) 1964 { 1965 struct ieee80211_local *local = sdata->local; 1966 bool enc_tailroom; 1967 int tail_need = 0; 1968 1969 enc_tailroom = encrypt == ENCRYPT_MGMT || 1970 (encrypt == ENCRYPT_DATA && 1971 sdata->crypto_tx_tailroom_needed_cnt); 1972 1973 if (enc_tailroom) { 1974 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1975 tail_need -= skb_tailroom(skb); 1976 tail_need = max_t(int, tail_need, 0); 1977 } 1978 1979 if (skb_cloned(skb) && 1980 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1981 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1982 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1983 else if (head_need || tail_need) 1984 I802_DEBUG_INC(local->tx_expand_skb_head); 1985 else 1986 return 0; 1987 1988 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1989 wiphy_debug(local->hw.wiphy, 1990 "failed to reallocate TX buffer\n"); 1991 return -ENOMEM; 1992 } 1993 1994 return 0; 1995 } 1996 1997 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 1998 struct sta_info *sta, struct sk_buff *skb) 1999 { 2000 struct ieee80211_local *local = sdata->local; 2001 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2002 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2003 int headroom; 2004 enum ieee80211_encrypt encrypt; 2005 2006 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2007 encrypt = ENCRYPT_NO; 2008 else if (ieee80211_is_mgmt(hdr->frame_control)) 2009 encrypt = ENCRYPT_MGMT; 2010 else 2011 encrypt = ENCRYPT_DATA; 2012 2013 headroom = local->tx_headroom; 2014 if (encrypt != ENCRYPT_NO) 2015 headroom += IEEE80211_ENCRYPT_HEADROOM; 2016 headroom -= skb_headroom(skb); 2017 headroom = max_t(int, 0, headroom); 2018 2019 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2020 ieee80211_free_txskb(&local->hw, skb); 2021 return; 2022 } 2023 2024 /* reload after potential resize */ 2025 hdr = (struct ieee80211_hdr *) skb->data; 2026 info->control.vif = &sdata->vif; 2027 2028 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2029 if (ieee80211_is_data(hdr->frame_control) && 2030 is_unicast_ether_addr(hdr->addr1)) { 2031 if (mesh_nexthop_resolve(sdata, skb)) 2032 return; /* skb queued: don't free */ 2033 } else { 2034 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2035 } 2036 } 2037 2038 ieee80211_set_qos_hdr(sdata, skb); 2039 ieee80211_tx(sdata, sta, skb, false); 2040 } 2041 2042 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2043 { 2044 struct ieee80211_radiotap_header *rthdr = 2045 (struct ieee80211_radiotap_header *)skb->data; 2046 2047 /* check for not even having the fixed radiotap header part */ 2048 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2049 return false; /* too short to be possibly valid */ 2050 2051 /* is it a header version we can trust to find length from? */ 2052 if (unlikely(rthdr->it_version)) 2053 return false; /* only version 0 is supported */ 2054 2055 /* does the skb contain enough to deliver on the alleged length? */ 2056 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2057 return false; /* skb too short for claimed rt header extent */ 2058 2059 return true; 2060 } 2061 2062 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2063 struct net_device *dev) 2064 { 2065 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2066 struct ieee80211_radiotap_iterator iterator; 2067 struct ieee80211_radiotap_header *rthdr = 2068 (struct ieee80211_radiotap_header *) skb->data; 2069 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2070 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2071 NULL); 2072 u16 txflags; 2073 u16 rate = 0; 2074 bool rate_found = false; 2075 u8 rate_retries = 0; 2076 u16 rate_flags = 0; 2077 u8 mcs_known, mcs_flags, mcs_bw; 2078 u16 vht_known; 2079 u8 vht_mcs = 0, vht_nss = 0; 2080 int i; 2081 2082 if (!ieee80211_validate_radiotap_len(skb)) 2083 return false; 2084 2085 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2086 IEEE80211_TX_CTL_DONTFRAG; 2087 2088 /* 2089 * for every radiotap entry that is present 2090 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2091 * entries present, or -EINVAL on error) 2092 */ 2093 2094 while (!ret) { 2095 ret = ieee80211_radiotap_iterator_next(&iterator); 2096 2097 if (ret) 2098 continue; 2099 2100 /* see if this argument is something we can use */ 2101 switch (iterator.this_arg_index) { 2102 /* 2103 * You must take care when dereferencing iterator.this_arg 2104 * for multibyte types... the pointer is not aligned. Use 2105 * get_unaligned((type *)iterator.this_arg) to dereference 2106 * iterator.this_arg for type "type" safely on all arches. 2107 */ 2108 case IEEE80211_RADIOTAP_FLAGS: 2109 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2110 /* 2111 * this indicates that the skb we have been 2112 * handed has the 32-bit FCS CRC at the end... 2113 * we should react to that by snipping it off 2114 * because it will be recomputed and added 2115 * on transmission 2116 */ 2117 if (skb->len < (iterator._max_length + FCS_LEN)) 2118 return false; 2119 2120 skb_trim(skb, skb->len - FCS_LEN); 2121 } 2122 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2123 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2124 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2125 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2126 break; 2127 2128 case IEEE80211_RADIOTAP_TX_FLAGS: 2129 txflags = get_unaligned_le16(iterator.this_arg); 2130 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2131 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2132 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2133 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2134 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2135 info->control.flags |= 2136 IEEE80211_TX_CTRL_DONT_REORDER; 2137 break; 2138 2139 case IEEE80211_RADIOTAP_RATE: 2140 rate = *iterator.this_arg; 2141 rate_flags = 0; 2142 rate_found = true; 2143 break; 2144 2145 case IEEE80211_RADIOTAP_DATA_RETRIES: 2146 rate_retries = *iterator.this_arg; 2147 break; 2148 2149 case IEEE80211_RADIOTAP_MCS: 2150 mcs_known = iterator.this_arg[0]; 2151 mcs_flags = iterator.this_arg[1]; 2152 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2153 break; 2154 2155 rate_found = true; 2156 rate = iterator.this_arg[2]; 2157 rate_flags = IEEE80211_TX_RC_MCS; 2158 2159 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2160 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2161 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2162 2163 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2164 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2165 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2166 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2167 2168 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2169 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2170 info->flags |= IEEE80211_TX_CTL_LDPC; 2171 2172 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2173 u8 stbc = u8_get_bits(mcs_flags, 2174 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2175 2176 info->flags |= 2177 u32_encode_bits(stbc, 2178 IEEE80211_TX_CTL_STBC); 2179 } 2180 break; 2181 2182 case IEEE80211_RADIOTAP_VHT: 2183 vht_known = get_unaligned_le16(iterator.this_arg); 2184 rate_found = true; 2185 2186 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2187 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2188 (iterator.this_arg[2] & 2189 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2190 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2191 if (vht_known & 2192 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2193 if (iterator.this_arg[3] == 1) 2194 rate_flags |= 2195 IEEE80211_TX_RC_40_MHZ_WIDTH; 2196 else if (iterator.this_arg[3] == 4) 2197 rate_flags |= 2198 IEEE80211_TX_RC_80_MHZ_WIDTH; 2199 else if (iterator.this_arg[3] == 11) 2200 rate_flags |= 2201 IEEE80211_TX_RC_160_MHZ_WIDTH; 2202 } 2203 2204 vht_mcs = iterator.this_arg[4] >> 4; 2205 if (vht_mcs > 11) 2206 vht_mcs = 0; 2207 vht_nss = iterator.this_arg[4] & 0xF; 2208 if (!vht_nss || vht_nss > 8) 2209 vht_nss = 1; 2210 break; 2211 2212 /* 2213 * Please update the file 2214 * Documentation/networking/mac80211-injection.rst 2215 * when parsing new fields here. 2216 */ 2217 2218 default: 2219 break; 2220 } 2221 } 2222 2223 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2224 return false; 2225 2226 if (rate_found) { 2227 struct ieee80211_supported_band *sband = 2228 local->hw.wiphy->bands[info->band]; 2229 2230 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2231 2232 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2233 info->control.rates[i].idx = -1; 2234 info->control.rates[i].flags = 0; 2235 info->control.rates[i].count = 0; 2236 } 2237 2238 if (rate_flags & IEEE80211_TX_RC_MCS) { 2239 info->control.rates[0].idx = rate; 2240 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2241 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2242 vht_nss); 2243 } else if (sband) { 2244 for (i = 0; i < sband->n_bitrates; i++) { 2245 if (rate * 5 != sband->bitrates[i].bitrate) 2246 continue; 2247 2248 info->control.rates[0].idx = i; 2249 break; 2250 } 2251 } 2252 2253 if (info->control.rates[0].idx < 0) 2254 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2255 2256 info->control.rates[0].flags = rate_flags; 2257 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2258 local->hw.max_rate_tries); 2259 } 2260 2261 return true; 2262 } 2263 2264 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2265 struct net_device *dev) 2266 { 2267 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2268 struct ieee80211_chanctx_conf *chanctx_conf; 2269 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2270 struct ieee80211_hdr *hdr; 2271 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2272 struct cfg80211_chan_def *chandef; 2273 u16 len_rthdr; 2274 int hdrlen; 2275 2276 memset(info, 0, sizeof(*info)); 2277 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2278 IEEE80211_TX_CTL_INJECTED; 2279 2280 /* Sanity-check the length of the radiotap header */ 2281 if (!ieee80211_validate_radiotap_len(skb)) 2282 goto fail; 2283 2284 /* we now know there is a radiotap header with a length we can use */ 2285 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2286 2287 /* 2288 * fix up the pointers accounting for the radiotap 2289 * header still being in there. We are being given 2290 * a precooked IEEE80211 header so no need for 2291 * normal processing 2292 */ 2293 skb_set_mac_header(skb, len_rthdr); 2294 /* 2295 * these are just fixed to the end of the rt area since we 2296 * don't have any better information and at this point, nobody cares 2297 */ 2298 skb_set_network_header(skb, len_rthdr); 2299 skb_set_transport_header(skb, len_rthdr); 2300 2301 if (skb->len < len_rthdr + 2) 2302 goto fail; 2303 2304 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2305 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2306 2307 if (skb->len < len_rthdr + hdrlen) 2308 goto fail; 2309 2310 /* 2311 * Initialize skb->protocol if the injected frame is a data frame 2312 * carrying a rfc1042 header 2313 */ 2314 if (ieee80211_is_data(hdr->frame_control) && 2315 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2316 u8 *payload = (u8 *)hdr + hdrlen; 2317 2318 if (ether_addr_equal(payload, rfc1042_header)) 2319 skb->protocol = cpu_to_be16((payload[6] << 8) | 2320 payload[7]); 2321 } 2322 2323 rcu_read_lock(); 2324 2325 /* 2326 * We process outgoing injected frames that have a local address 2327 * we handle as though they are non-injected frames. 2328 * This code here isn't entirely correct, the local MAC address 2329 * isn't always enough to find the interface to use; for proper 2330 * VLAN support we have an nl80211-based mechanism. 2331 * 2332 * This is necessary, for example, for old hostapd versions that 2333 * don't use nl80211-based management TX/RX. 2334 */ 2335 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2336 2337 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2338 if (!ieee80211_sdata_running(tmp_sdata)) 2339 continue; 2340 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2341 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2342 continue; 2343 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2344 sdata = tmp_sdata; 2345 break; 2346 } 2347 } 2348 2349 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2350 if (!chanctx_conf) { 2351 tmp_sdata = rcu_dereference(local->monitor_sdata); 2352 if (tmp_sdata) 2353 chanctx_conf = 2354 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2355 } 2356 2357 if (chanctx_conf) 2358 chandef = &chanctx_conf->def; 2359 else if (!local->use_chanctx) 2360 chandef = &local->_oper_chandef; 2361 else 2362 goto fail_rcu; 2363 2364 /* 2365 * Frame injection is not allowed if beaconing is not allowed 2366 * or if we need radar detection. Beaconing is usually not allowed when 2367 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2368 * Passive scan is also used in world regulatory domains where 2369 * your country is not known and as such it should be treated as 2370 * NO TX unless the channel is explicitly allowed in which case 2371 * your current regulatory domain would not have the passive scan 2372 * flag. 2373 * 2374 * Since AP mode uses monitor interfaces to inject/TX management 2375 * frames we can make AP mode the exception to this rule once it 2376 * supports radar detection as its implementation can deal with 2377 * radar detection by itself. We can do that later by adding a 2378 * monitor flag interfaces used for AP support. 2379 */ 2380 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2381 sdata->vif.type)) 2382 goto fail_rcu; 2383 2384 info->band = chandef->chan->band; 2385 2386 /* Initialize skb->priority according to frame type and TID class, 2387 * with respect to the sub interface that the frame will actually 2388 * be transmitted on. If the DONT_REORDER flag is set, the original 2389 * skb-priority is preserved to assure frames injected with this 2390 * flag are not reordered relative to each other. 2391 */ 2392 ieee80211_select_queue_80211(sdata, skb, hdr); 2393 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2394 2395 /* 2396 * Process the radiotap header. This will now take into account the 2397 * selected chandef above to accurately set injection rates and 2398 * retransmissions. 2399 */ 2400 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2401 goto fail_rcu; 2402 2403 /* remove the injection radiotap header */ 2404 skb_pull(skb, len_rthdr); 2405 2406 ieee80211_xmit(sdata, NULL, skb); 2407 rcu_read_unlock(); 2408 2409 return NETDEV_TX_OK; 2410 2411 fail_rcu: 2412 rcu_read_unlock(); 2413 fail: 2414 dev_kfree_skb(skb); 2415 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2416 } 2417 2418 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2419 { 2420 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2421 2422 return ethertype == ETH_P_TDLS && 2423 skb->len > 14 && 2424 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2425 } 2426 2427 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2428 struct sk_buff *skb, 2429 struct sta_info **sta_out) 2430 { 2431 struct sta_info *sta; 2432 2433 switch (sdata->vif.type) { 2434 case NL80211_IFTYPE_AP_VLAN: 2435 sta = rcu_dereference(sdata->u.vlan.sta); 2436 if (sta) { 2437 *sta_out = sta; 2438 return 0; 2439 } else if (sdata->wdev.use_4addr) { 2440 return -ENOLINK; 2441 } 2442 fallthrough; 2443 case NL80211_IFTYPE_AP: 2444 case NL80211_IFTYPE_OCB: 2445 case NL80211_IFTYPE_ADHOC: 2446 if (is_multicast_ether_addr(skb->data)) { 2447 *sta_out = ERR_PTR(-ENOENT); 2448 return 0; 2449 } 2450 sta = sta_info_get_bss(sdata, skb->data); 2451 break; 2452 #ifdef CONFIG_MAC80211_MESH 2453 case NL80211_IFTYPE_MESH_POINT: 2454 /* determined much later */ 2455 *sta_out = NULL; 2456 return 0; 2457 #endif 2458 case NL80211_IFTYPE_STATION: 2459 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2460 sta = sta_info_get(sdata, skb->data); 2461 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2462 if (test_sta_flag(sta, 2463 WLAN_STA_TDLS_PEER_AUTH)) { 2464 *sta_out = sta; 2465 return 0; 2466 } 2467 2468 /* 2469 * TDLS link during setup - throw out frames to 2470 * peer. Allow TDLS-setup frames to unauthorized 2471 * peers for the special case of a link teardown 2472 * after a TDLS sta is removed due to being 2473 * unreachable. 2474 */ 2475 if (!ieee80211_is_tdls_setup(skb)) 2476 return -EINVAL; 2477 } 2478 2479 } 2480 2481 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 2482 if (!sta) 2483 return -ENOLINK; 2484 break; 2485 default: 2486 return -EINVAL; 2487 } 2488 2489 *sta_out = sta ?: ERR_PTR(-ENOENT); 2490 return 0; 2491 } 2492 2493 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2494 struct sk_buff *skb, 2495 u32 *info_flags, 2496 u64 *cookie) 2497 { 2498 struct sk_buff *ack_skb; 2499 u16 info_id = 0; 2500 2501 if (skb->sk) 2502 ack_skb = skb_clone_sk(skb); 2503 else 2504 ack_skb = skb_clone(skb, GFP_ATOMIC); 2505 2506 if (ack_skb) { 2507 unsigned long flags; 2508 int id; 2509 2510 spin_lock_irqsave(&local->ack_status_lock, flags); 2511 id = idr_alloc(&local->ack_status_frames, ack_skb, 2512 1, 0x2000, GFP_ATOMIC); 2513 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2514 2515 if (id >= 0) { 2516 info_id = id; 2517 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2518 if (cookie) { 2519 *cookie = ieee80211_mgmt_tx_cookie(local); 2520 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2521 } 2522 } else { 2523 kfree_skb(ack_skb); 2524 } 2525 } 2526 2527 return info_id; 2528 } 2529 2530 /** 2531 * ieee80211_build_hdr - build 802.11 header in the given frame 2532 * @sdata: virtual interface to build the header for 2533 * @skb: the skb to build the header in 2534 * @info_flags: skb flags to set 2535 * @sta: the station pointer 2536 * @ctrl_flags: info control flags to set 2537 * @cookie: cookie pointer to fill (if not %NULL) 2538 * 2539 * This function takes the skb with 802.3 header and reformats the header to 2540 * the appropriate IEEE 802.11 header based on which interface the packet is 2541 * being transmitted on. 2542 * 2543 * Note that this function also takes care of the TX status request and 2544 * potential unsharing of the SKB - this needs to be interleaved with the 2545 * header building. 2546 * 2547 * The function requires the read-side RCU lock held 2548 * 2549 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2550 */ 2551 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2552 struct sk_buff *skb, u32 info_flags, 2553 struct sta_info *sta, u32 ctrl_flags, 2554 u64 *cookie) 2555 { 2556 struct ieee80211_local *local = sdata->local; 2557 struct ieee80211_tx_info *info; 2558 int head_need; 2559 u16 ethertype, hdrlen, meshhdrlen = 0; 2560 __le16 fc; 2561 struct ieee80211_hdr hdr; 2562 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2563 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2564 const u8 *encaps_data; 2565 int encaps_len, skip_header_bytes; 2566 bool wme_sta = false, authorized = false; 2567 bool tdls_peer; 2568 bool multicast; 2569 u16 info_id = 0; 2570 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2571 enum nl80211_band band; 2572 int ret; 2573 2574 if (IS_ERR(sta)) 2575 sta = NULL; 2576 2577 #ifdef CONFIG_MAC80211_DEBUGFS 2578 if (local->force_tx_status) 2579 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2580 #endif 2581 2582 /* convert Ethernet header to proper 802.11 header (based on 2583 * operation mode) */ 2584 ethertype = (skb->data[12] << 8) | skb->data[13]; 2585 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2586 2587 if (!sdata->vif.valid_links) 2588 chanctx_conf = 2589 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2590 2591 switch (sdata->vif.type) { 2592 case NL80211_IFTYPE_AP_VLAN: 2593 if (sdata->wdev.use_4addr) { 2594 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2595 /* RA TA DA SA */ 2596 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2597 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2598 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2599 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2600 hdrlen = 30; 2601 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2602 wme_sta = sta->sta.wme; 2603 } 2604 if (!sdata->vif.valid_links) { 2605 struct ieee80211_sub_if_data *ap_sdata; 2606 2607 /* override chanctx_conf from AP (we don't have one) */ 2608 ap_sdata = container_of(sdata->bss, 2609 struct ieee80211_sub_if_data, 2610 u.ap); 2611 chanctx_conf = 2612 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2613 } 2614 if (sdata->wdev.use_4addr) 2615 break; 2616 fallthrough; 2617 case NL80211_IFTYPE_AP: 2618 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2619 /* DA BSSID SA */ 2620 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2621 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2622 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2623 hdrlen = 24; 2624 break; 2625 #ifdef CONFIG_MAC80211_MESH 2626 case NL80211_IFTYPE_MESH_POINT: 2627 if (!is_multicast_ether_addr(skb->data)) { 2628 struct sta_info *next_hop; 2629 bool mpp_lookup = true; 2630 2631 mpath = mesh_path_lookup(sdata, skb->data); 2632 if (mpath) { 2633 mpp_lookup = false; 2634 next_hop = rcu_dereference(mpath->next_hop); 2635 if (!next_hop || 2636 !(mpath->flags & (MESH_PATH_ACTIVE | 2637 MESH_PATH_RESOLVING))) 2638 mpp_lookup = true; 2639 } 2640 2641 if (mpp_lookup) { 2642 mppath = mpp_path_lookup(sdata, skb->data); 2643 if (mppath) 2644 mppath->exp_time = jiffies; 2645 } 2646 2647 if (mppath && mpath) 2648 mesh_path_del(sdata, mpath->dst); 2649 } 2650 2651 /* 2652 * Use address extension if it is a packet from 2653 * another interface or if we know the destination 2654 * is being proxied by a portal (i.e. portal address 2655 * differs from proxied address) 2656 */ 2657 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2658 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2659 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2660 skb->data, skb->data + ETH_ALEN); 2661 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2662 NULL, NULL); 2663 } else { 2664 /* DS -> MBSS (802.11-2012 13.11.3.3). 2665 * For unicast with unknown forwarding information, 2666 * destination might be in the MBSS or if that fails 2667 * forwarded to another mesh gate. In either case 2668 * resolution will be handled in ieee80211_xmit(), so 2669 * leave the original DA. This also works for mcast */ 2670 const u8 *mesh_da = skb->data; 2671 2672 if (mppath) 2673 mesh_da = mppath->mpp; 2674 else if (mpath) 2675 mesh_da = mpath->dst; 2676 2677 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2678 mesh_da, sdata->vif.addr); 2679 if (is_multicast_ether_addr(mesh_da)) 2680 /* DA TA mSA AE:SA */ 2681 meshhdrlen = ieee80211_new_mesh_header( 2682 sdata, &mesh_hdr, 2683 skb->data + ETH_ALEN, NULL); 2684 else 2685 /* RA TA mDA mSA AE:DA SA */ 2686 meshhdrlen = ieee80211_new_mesh_header( 2687 sdata, &mesh_hdr, skb->data, 2688 skb->data + ETH_ALEN); 2689 2690 } 2691 2692 /* For injected frames, fill RA right away as nexthop lookup 2693 * will be skipped. 2694 */ 2695 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2696 is_zero_ether_addr(hdr.addr1)) 2697 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2698 break; 2699 #endif 2700 case NL80211_IFTYPE_STATION: 2701 /* we already did checks when looking up the RA STA */ 2702 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2703 2704 if (tdls_peer) { 2705 /* DA SA BSSID */ 2706 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2707 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2708 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2709 hdrlen = 24; 2710 } else if (sdata->u.mgd.use_4addr && 2711 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2712 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2713 IEEE80211_FCTL_TODS); 2714 /* RA TA DA SA */ 2715 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2716 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2717 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2718 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2719 hdrlen = 30; 2720 } else { 2721 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2722 /* BSSID SA DA */ 2723 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2724 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2725 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2726 hdrlen = 24; 2727 } 2728 break; 2729 case NL80211_IFTYPE_OCB: 2730 /* DA SA BSSID */ 2731 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2732 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2733 eth_broadcast_addr(hdr.addr3); 2734 hdrlen = 24; 2735 break; 2736 case NL80211_IFTYPE_ADHOC: 2737 /* DA SA BSSID */ 2738 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2739 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2740 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2741 hdrlen = 24; 2742 break; 2743 default: 2744 ret = -EINVAL; 2745 goto free; 2746 } 2747 2748 if (!chanctx_conf) { 2749 if (!sdata->vif.valid_links) { 2750 ret = -ENOTCONN; 2751 goto free; 2752 } 2753 /* MLD transmissions must not rely on the band */ 2754 band = 0; 2755 } else { 2756 band = chanctx_conf->def.chan->band; 2757 } 2758 2759 multicast = is_multicast_ether_addr(hdr.addr1); 2760 2761 /* sta is always NULL for mesh */ 2762 if (sta) { 2763 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2764 wme_sta = sta->sta.wme; 2765 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2766 /* For mesh, the use of the QoS header is mandatory */ 2767 wme_sta = true; 2768 } 2769 2770 /* receiver does QoS (which also means we do) use it */ 2771 if (wme_sta) { 2772 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2773 hdrlen += 2; 2774 } 2775 2776 /* 2777 * Drop unicast frames to unauthorised stations unless they are 2778 * EAPOL frames from the local station. 2779 */ 2780 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2781 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2782 !multicast && !authorized && 2783 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2784 !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { 2785 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2786 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2787 sdata->name, hdr.addr1); 2788 #endif 2789 2790 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2791 2792 ret = -EPERM; 2793 goto free; 2794 } 2795 2796 if (unlikely(!multicast && ((skb->sk && 2797 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2798 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2799 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2800 cookie); 2801 2802 /* 2803 * If the skb is shared we need to obtain our own copy. 2804 */ 2805 skb = skb_share_check(skb, GFP_ATOMIC); 2806 if (unlikely(!skb)) { 2807 ret = -ENOMEM; 2808 goto free; 2809 } 2810 2811 hdr.frame_control = fc; 2812 hdr.duration_id = 0; 2813 hdr.seq_ctrl = 0; 2814 2815 skip_header_bytes = ETH_HLEN; 2816 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2817 encaps_data = bridge_tunnel_header; 2818 encaps_len = sizeof(bridge_tunnel_header); 2819 skip_header_bytes -= 2; 2820 } else if (ethertype >= ETH_P_802_3_MIN) { 2821 encaps_data = rfc1042_header; 2822 encaps_len = sizeof(rfc1042_header); 2823 skip_header_bytes -= 2; 2824 } else { 2825 encaps_data = NULL; 2826 encaps_len = 0; 2827 } 2828 2829 skb_pull(skb, skip_header_bytes); 2830 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2831 2832 /* 2833 * So we need to modify the skb header and hence need a copy of 2834 * that. The head_need variable above doesn't, so far, include 2835 * the needed header space that we don't need right away. If we 2836 * can, then we don't reallocate right now but only after the 2837 * frame arrives at the master device (if it does...) 2838 * 2839 * If we cannot, however, then we will reallocate to include all 2840 * the ever needed space. Also, if we need to reallocate it anyway, 2841 * make it big enough for everything we may ever need. 2842 */ 2843 2844 if (head_need > 0 || skb_cloned(skb)) { 2845 head_need += IEEE80211_ENCRYPT_HEADROOM; 2846 head_need += local->tx_headroom; 2847 head_need = max_t(int, 0, head_need); 2848 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2849 ieee80211_free_txskb(&local->hw, skb); 2850 skb = NULL; 2851 return ERR_PTR(-ENOMEM); 2852 } 2853 } 2854 2855 if (encaps_data) 2856 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2857 2858 #ifdef CONFIG_MAC80211_MESH 2859 if (meshhdrlen > 0) 2860 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2861 #endif 2862 2863 if (ieee80211_is_data_qos(fc)) { 2864 __le16 *qos_control; 2865 2866 qos_control = skb_push(skb, 2); 2867 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2868 /* 2869 * Maybe we could actually set some fields here, for now just 2870 * initialise to zero to indicate no special operation. 2871 */ 2872 *qos_control = 0; 2873 } else 2874 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2875 2876 skb_reset_mac_header(skb); 2877 2878 info = IEEE80211_SKB_CB(skb); 2879 memset(info, 0, sizeof(*info)); 2880 2881 info->flags = info_flags; 2882 info->ack_frame_id = info_id; 2883 info->band = band; 2884 info->control.flags = ctrl_flags | 2885 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 2886 IEEE80211_TX_CTRL_MLO_LINK); 2887 2888 return skb; 2889 free: 2890 kfree_skb(skb); 2891 return ERR_PTR(ret); 2892 } 2893 2894 /* 2895 * fast-xmit overview 2896 * 2897 * The core idea of this fast-xmit is to remove per-packet checks by checking 2898 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2899 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2900 * much less work can be done per packet. For example, fragmentation must be 2901 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2902 * in the code here. 2903 * 2904 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2905 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2906 * 2907 * The most difficult part of this is that when any of these assumptions 2908 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2909 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2910 * since the per-packet code no longer checks the conditions. This is reflected 2911 * by the calls to these functions throughout the rest of the code, and must be 2912 * maintained if any of the TX path checks change. 2913 */ 2914 2915 void ieee80211_check_fast_xmit(struct sta_info *sta) 2916 { 2917 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2918 struct ieee80211_local *local = sta->local; 2919 struct ieee80211_sub_if_data *sdata = sta->sdata; 2920 struct ieee80211_hdr *hdr = (void *)build.hdr; 2921 struct ieee80211_chanctx_conf *chanctx_conf; 2922 __le16 fc; 2923 2924 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2925 return; 2926 2927 /* Locking here protects both the pointer itself, and against concurrent 2928 * invocations winning data access races to, e.g., the key pointer that 2929 * is used. 2930 * Without it, the invocation of this function right after the key 2931 * pointer changes wouldn't be sufficient, as another CPU could access 2932 * the pointer, then stall, and then do the cache update after the CPU 2933 * that invalidated the key. 2934 * With the locking, such scenarios cannot happen as the check for the 2935 * key and the fast-tx assignment are done atomically, so the CPU that 2936 * modifies the key will either wait or other one will see the key 2937 * cleared/changed already. 2938 */ 2939 spin_lock_bh(&sta->lock); 2940 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 2941 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 2942 sdata->vif.type == NL80211_IFTYPE_STATION) 2943 goto out; 2944 2945 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 2946 goto out; 2947 2948 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 2949 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 2950 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 2951 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 2952 goto out; 2953 2954 if (sdata->noack_map) 2955 goto out; 2956 2957 /* fast-xmit doesn't handle fragmentation at all */ 2958 if (local->hw.wiphy->frag_threshold != (u32)-1 && 2959 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 2960 goto out; 2961 2962 if (!sdata->vif.valid_links) { 2963 rcu_read_lock(); 2964 chanctx_conf = 2965 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2966 if (!chanctx_conf) { 2967 rcu_read_unlock(); 2968 goto out; 2969 } 2970 build.band = chanctx_conf->def.chan->band; 2971 rcu_read_unlock(); 2972 } else { 2973 /* MLD transmissions must not rely on the band */ 2974 build.band = 0; 2975 } 2976 2977 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2978 2979 switch (sdata->vif.type) { 2980 case NL80211_IFTYPE_ADHOC: 2981 /* DA SA BSSID */ 2982 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2983 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2984 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 2985 build.hdr_len = 24; 2986 break; 2987 case NL80211_IFTYPE_STATION: 2988 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2989 /* DA SA BSSID */ 2990 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 2991 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 2992 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2993 build.hdr_len = 24; 2994 break; 2995 } 2996 2997 if (sdata->u.mgd.use_4addr) { 2998 /* non-regular ethertype cannot use the fastpath */ 2999 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3000 IEEE80211_FCTL_TODS); 3001 /* RA TA DA SA */ 3002 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3003 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3004 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3005 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3006 build.hdr_len = 30; 3007 break; 3008 } 3009 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3010 /* BSSID SA DA */ 3011 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3012 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3013 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3014 build.hdr_len = 24; 3015 break; 3016 case NL80211_IFTYPE_AP_VLAN: 3017 if (sdata->wdev.use_4addr) { 3018 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3019 IEEE80211_FCTL_TODS); 3020 /* RA TA DA SA */ 3021 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3022 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3023 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3024 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3025 build.hdr_len = 30; 3026 break; 3027 } 3028 fallthrough; 3029 case NL80211_IFTYPE_AP: 3030 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3031 /* DA BSSID SA */ 3032 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3033 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3034 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3035 build.hdr_len = 24; 3036 break; 3037 default: 3038 /* not handled on fast-xmit */ 3039 goto out; 3040 } 3041 3042 if (sta->sta.wme) { 3043 build.hdr_len += 2; 3044 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3045 } 3046 3047 /* We store the key here so there's no point in using rcu_dereference() 3048 * but that's fine because the code that changes the pointers will call 3049 * this function after doing so. For a single CPU that would be enough, 3050 * for multiple see the comment above. 3051 */ 3052 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3053 if (!build.key) 3054 build.key = rcu_access_pointer(sdata->default_unicast_key); 3055 if (build.key) { 3056 bool gen_iv, iv_spc, mmic; 3057 3058 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3059 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3060 mmic = build.key->conf.flags & 3061 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3062 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3063 3064 /* don't handle software crypto */ 3065 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3066 goto out; 3067 3068 /* Key is being removed */ 3069 if (build.key->flags & KEY_FLAG_TAINTED) 3070 goto out; 3071 3072 switch (build.key->conf.cipher) { 3073 case WLAN_CIPHER_SUITE_CCMP: 3074 case WLAN_CIPHER_SUITE_CCMP_256: 3075 if (gen_iv) 3076 build.pn_offs = build.hdr_len; 3077 if (gen_iv || iv_spc) 3078 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3079 break; 3080 case WLAN_CIPHER_SUITE_GCMP: 3081 case WLAN_CIPHER_SUITE_GCMP_256: 3082 if (gen_iv) 3083 build.pn_offs = build.hdr_len; 3084 if (gen_iv || iv_spc) 3085 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3086 break; 3087 case WLAN_CIPHER_SUITE_TKIP: 3088 /* cannot handle MMIC or IV generation in xmit-fast */ 3089 if (mmic || gen_iv) 3090 goto out; 3091 if (iv_spc) 3092 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3093 break; 3094 case WLAN_CIPHER_SUITE_WEP40: 3095 case WLAN_CIPHER_SUITE_WEP104: 3096 /* cannot handle IV generation in fast-xmit */ 3097 if (gen_iv) 3098 goto out; 3099 if (iv_spc) 3100 build.hdr_len += IEEE80211_WEP_IV_LEN; 3101 break; 3102 case WLAN_CIPHER_SUITE_AES_CMAC: 3103 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3104 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3105 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3106 WARN(1, 3107 "management cipher suite 0x%x enabled for data\n", 3108 build.key->conf.cipher); 3109 goto out; 3110 default: 3111 /* we don't know how to generate IVs for this at all */ 3112 if (WARN_ON(gen_iv)) 3113 goto out; 3114 } 3115 3116 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3117 } 3118 3119 hdr->frame_control = fc; 3120 3121 memcpy(build.hdr + build.hdr_len, 3122 rfc1042_header, sizeof(rfc1042_header)); 3123 build.hdr_len += sizeof(rfc1042_header); 3124 3125 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3126 /* if the kmemdup fails, continue w/o fast_tx */ 3127 3128 out: 3129 /* we might have raced against another call to this function */ 3130 old = rcu_dereference_protected(sta->fast_tx, 3131 lockdep_is_held(&sta->lock)); 3132 rcu_assign_pointer(sta->fast_tx, fast_tx); 3133 if (old) 3134 kfree_rcu(old, rcu_head); 3135 spin_unlock_bh(&sta->lock); 3136 } 3137 3138 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3139 { 3140 struct sta_info *sta; 3141 3142 rcu_read_lock(); 3143 list_for_each_entry_rcu(sta, &local->sta_list, list) 3144 ieee80211_check_fast_xmit(sta); 3145 rcu_read_unlock(); 3146 } 3147 3148 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3149 { 3150 struct ieee80211_local *local = sdata->local; 3151 struct sta_info *sta; 3152 3153 rcu_read_lock(); 3154 3155 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3156 if (sdata != sta->sdata && 3157 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3158 continue; 3159 ieee80211_check_fast_xmit(sta); 3160 } 3161 3162 rcu_read_unlock(); 3163 } 3164 3165 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3166 { 3167 struct ieee80211_fast_tx *fast_tx; 3168 3169 spin_lock_bh(&sta->lock); 3170 fast_tx = rcu_dereference_protected(sta->fast_tx, 3171 lockdep_is_held(&sta->lock)); 3172 RCU_INIT_POINTER(sta->fast_tx, NULL); 3173 spin_unlock_bh(&sta->lock); 3174 3175 if (fast_tx) 3176 kfree_rcu(fast_tx, rcu_head); 3177 } 3178 3179 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3180 struct sk_buff *skb, int headroom) 3181 { 3182 if (skb_headroom(skb) < headroom) { 3183 I802_DEBUG_INC(local->tx_expand_skb_head); 3184 3185 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3186 wiphy_debug(local->hw.wiphy, 3187 "failed to reallocate TX buffer\n"); 3188 return false; 3189 } 3190 } 3191 3192 return true; 3193 } 3194 3195 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3196 struct ieee80211_fast_tx *fast_tx, 3197 struct sk_buff *skb) 3198 { 3199 struct ieee80211_local *local = sdata->local; 3200 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3201 struct ieee80211_hdr *hdr; 3202 struct ethhdr *amsdu_hdr; 3203 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3204 int subframe_len = skb->len - hdr_len; 3205 void *data; 3206 u8 *qc, *h_80211_src, *h_80211_dst; 3207 const u8 *bssid; 3208 3209 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3210 return false; 3211 3212 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3213 return true; 3214 3215 if (!ieee80211_amsdu_realloc_pad(local, skb, 3216 sizeof(*amsdu_hdr) + 3217 local->hw.extra_tx_headroom)) 3218 return false; 3219 3220 data = skb_push(skb, sizeof(*amsdu_hdr)); 3221 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3222 hdr = data; 3223 amsdu_hdr = data + hdr_len; 3224 /* h_80211_src/dst is addr* field within hdr */ 3225 h_80211_src = data + fast_tx->sa_offs; 3226 h_80211_dst = data + fast_tx->da_offs; 3227 3228 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3229 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3230 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3231 3232 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3233 * fields needs to be changed to BSSID for A-MSDU frames depending 3234 * on FromDS/ToDS values. 3235 */ 3236 switch (sdata->vif.type) { 3237 case NL80211_IFTYPE_STATION: 3238 bssid = sdata->deflink.u.mgd.bssid; 3239 break; 3240 case NL80211_IFTYPE_AP: 3241 case NL80211_IFTYPE_AP_VLAN: 3242 bssid = sdata->vif.addr; 3243 break; 3244 default: 3245 bssid = NULL; 3246 } 3247 3248 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3249 ether_addr_copy(h_80211_src, bssid); 3250 3251 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3252 ether_addr_copy(h_80211_dst, bssid); 3253 3254 qc = ieee80211_get_qos_ctl(hdr); 3255 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3256 3257 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3258 3259 return true; 3260 } 3261 3262 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3263 struct sta_info *sta, 3264 struct ieee80211_fast_tx *fast_tx, 3265 struct sk_buff *skb) 3266 { 3267 struct ieee80211_local *local = sdata->local; 3268 struct fq *fq = &local->fq; 3269 struct fq_tin *tin; 3270 struct fq_flow *flow; 3271 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3272 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3273 struct txq_info *txqi; 3274 struct sk_buff **frag_tail, *head; 3275 int subframe_len = skb->len - ETH_ALEN; 3276 u8 max_subframes = sta->sta.max_amsdu_subframes; 3277 int max_frags = local->hw.max_tx_fragments; 3278 int max_amsdu_len = sta->sta.max_amsdu_len; 3279 int orig_truesize; 3280 u32 flow_idx; 3281 __be16 len; 3282 void *data; 3283 bool ret = false; 3284 unsigned int orig_len; 3285 int n = 2, nfrags, pad = 0; 3286 u16 hdrlen; 3287 3288 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3289 return false; 3290 3291 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3292 return false; 3293 3294 if (skb_is_gso(skb)) 3295 return false; 3296 3297 if (!txq) 3298 return false; 3299 3300 txqi = to_txq_info(txq); 3301 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3302 return false; 3303 3304 if (sta->sta.max_rc_amsdu_len) 3305 max_amsdu_len = min_t(int, max_amsdu_len, 3306 sta->sta.max_rc_amsdu_len); 3307 3308 if (sta->sta.max_tid_amsdu_len[tid]) 3309 max_amsdu_len = min_t(int, max_amsdu_len, 3310 sta->sta.max_tid_amsdu_len[tid]); 3311 3312 flow_idx = fq_flow_idx(fq, skb); 3313 3314 spin_lock_bh(&fq->lock); 3315 3316 /* TODO: Ideally aggregation should be done on dequeue to remain 3317 * responsive to environment changes. 3318 */ 3319 3320 tin = &txqi->tin; 3321 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3322 head = skb_peek_tail(&flow->queue); 3323 if (!head || skb_is_gso(head)) 3324 goto out; 3325 3326 orig_truesize = head->truesize; 3327 orig_len = head->len; 3328 3329 if (skb->len + head->len > max_amsdu_len) 3330 goto out; 3331 3332 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3333 nfrags += 1 + skb_shinfo(head)->nr_frags; 3334 frag_tail = &skb_shinfo(head)->frag_list; 3335 while (*frag_tail) { 3336 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3337 frag_tail = &(*frag_tail)->next; 3338 n++; 3339 } 3340 3341 if (max_subframes && n > max_subframes) 3342 goto out; 3343 3344 if (max_frags && nfrags > max_frags) 3345 goto out; 3346 3347 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3348 goto out; 3349 3350 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3351 goto out; 3352 3353 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3354 * and frag_tail should be &skb_shinfo(head)->frag_list. 3355 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3356 * Reload frag_tail to have it pointing to the correct place. 3357 */ 3358 if (n == 2) 3359 frag_tail = &skb_shinfo(head)->frag_list; 3360 3361 /* 3362 * Pad out the previous subframe to a multiple of 4 by adding the 3363 * padding to the next one, that's being added. Note that head->len 3364 * is the length of the full A-MSDU, but that works since each time 3365 * we add a new subframe we pad out the previous one to a multiple 3366 * of 4 and thus it no longer matters in the next round. 3367 */ 3368 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3369 if ((head->len - hdrlen) & 3) 3370 pad = 4 - ((head->len - hdrlen) & 3); 3371 3372 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3373 2 + pad)) 3374 goto out_recalc; 3375 3376 ret = true; 3377 data = skb_push(skb, ETH_ALEN + 2); 3378 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3379 3380 data += 2 * ETH_ALEN; 3381 len = cpu_to_be16(subframe_len); 3382 memcpy(data, &len, 2); 3383 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3384 3385 memset(skb_push(skb, pad), 0, pad); 3386 3387 head->len += skb->len; 3388 head->data_len += skb->len; 3389 *frag_tail = skb; 3390 3391 out_recalc: 3392 fq->memory_usage += head->truesize - orig_truesize; 3393 if (head->len != orig_len) { 3394 flow->backlog += head->len - orig_len; 3395 tin->backlog_bytes += head->len - orig_len; 3396 } 3397 out: 3398 spin_unlock_bh(&fq->lock); 3399 3400 return ret; 3401 } 3402 3403 /* 3404 * Can be called while the sta lock is held. Anything that can cause packets to 3405 * be generated will cause deadlock! 3406 */ 3407 static ieee80211_tx_result 3408 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3409 struct sta_info *sta, u8 pn_offs, 3410 struct ieee80211_key *key, 3411 struct ieee80211_tx_data *tx) 3412 { 3413 struct sk_buff *skb = tx->skb; 3414 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3415 struct ieee80211_hdr *hdr = (void *)skb->data; 3416 u8 tid = IEEE80211_NUM_TIDS; 3417 3418 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3419 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3420 return TX_DROP; 3421 3422 if (key) 3423 info->control.hw_key = &key->conf; 3424 3425 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3426 3427 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3428 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3429 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3430 } else { 3431 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3432 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3433 sdata->sequence_number += 0x10; 3434 } 3435 3436 if (skb_shinfo(skb)->gso_size) 3437 sta->deflink.tx_stats.msdu[tid] += 3438 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3439 else 3440 sta->deflink.tx_stats.msdu[tid]++; 3441 3442 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3443 3444 /* statistics normally done by ieee80211_tx_h_stats (but that 3445 * has to consider fragmentation, so is more complex) 3446 */ 3447 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3448 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3449 3450 if (pn_offs) { 3451 u64 pn; 3452 u8 *crypto_hdr = skb->data + pn_offs; 3453 3454 switch (key->conf.cipher) { 3455 case WLAN_CIPHER_SUITE_CCMP: 3456 case WLAN_CIPHER_SUITE_CCMP_256: 3457 case WLAN_CIPHER_SUITE_GCMP: 3458 case WLAN_CIPHER_SUITE_GCMP_256: 3459 pn = atomic64_inc_return(&key->conf.tx_pn); 3460 crypto_hdr[0] = pn; 3461 crypto_hdr[1] = pn >> 8; 3462 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3463 crypto_hdr[4] = pn >> 16; 3464 crypto_hdr[5] = pn >> 24; 3465 crypto_hdr[6] = pn >> 32; 3466 crypto_hdr[7] = pn >> 40; 3467 break; 3468 } 3469 } 3470 3471 return TX_CONTINUE; 3472 } 3473 3474 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3475 struct sta_info *sta, 3476 struct ieee80211_fast_tx *fast_tx, 3477 struct sk_buff *skb) 3478 { 3479 struct ieee80211_local *local = sdata->local; 3480 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3481 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3482 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3483 struct ethhdr eth; 3484 struct ieee80211_tx_info *info; 3485 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3486 struct ieee80211_tx_data tx; 3487 ieee80211_tx_result r; 3488 struct tid_ampdu_tx *tid_tx = NULL; 3489 u8 tid = IEEE80211_NUM_TIDS; 3490 3491 /* control port protocol needs a lot of special handling */ 3492 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3493 return false; 3494 3495 /* only RFC 1042 SNAP */ 3496 if (ethertype < ETH_P_802_3_MIN) 3497 return false; 3498 3499 /* don't handle TX status request here either */ 3500 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3501 return false; 3502 3503 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3504 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3505 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3506 if (tid_tx) { 3507 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3508 return false; 3509 if (tid_tx->timeout) 3510 tid_tx->last_tx = jiffies; 3511 } 3512 } 3513 3514 /* after this point (skb is modified) we cannot return false */ 3515 3516 skb = skb_share_check(skb, GFP_ATOMIC); 3517 if (unlikely(!skb)) 3518 return true; 3519 3520 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3521 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3522 return true; 3523 3524 /* will not be crypto-handled beyond what we do here, so use false 3525 * as the may-encrypt argument for the resize to not account for 3526 * more room than we already have in 'extra_head' 3527 */ 3528 if (unlikely(ieee80211_skb_resize(sdata, skb, 3529 max_t(int, extra_head + hw_headroom - 3530 skb_headroom(skb), 0), 3531 ENCRYPT_NO))) { 3532 kfree_skb(skb); 3533 return true; 3534 } 3535 3536 memcpy(ð, skb->data, ETH_HLEN - 2); 3537 hdr = skb_push(skb, extra_head); 3538 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3539 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3540 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3541 3542 info = IEEE80211_SKB_CB(skb); 3543 memset(info, 0, sizeof(*info)); 3544 info->band = fast_tx->band; 3545 info->control.vif = &sdata->vif; 3546 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3547 IEEE80211_TX_CTL_DONTFRAG | 3548 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3549 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3550 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3551 IEEE80211_TX_CTRL_MLO_LINK); 3552 3553 #ifdef CONFIG_MAC80211_DEBUGFS 3554 if (local->force_tx_status) 3555 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3556 #endif 3557 3558 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3559 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3560 *ieee80211_get_qos_ctl(hdr) = tid; 3561 } 3562 3563 __skb_queue_head_init(&tx.skbs); 3564 3565 tx.flags = IEEE80211_TX_UNICAST; 3566 tx.local = local; 3567 tx.sdata = sdata; 3568 tx.sta = sta; 3569 tx.key = fast_tx->key; 3570 3571 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3572 return true; 3573 3574 tx.skb = skb; 3575 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3576 fast_tx->key, &tx); 3577 tx.skb = NULL; 3578 if (r == TX_DROP) { 3579 kfree_skb(skb); 3580 return true; 3581 } 3582 3583 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3584 sdata = container_of(sdata->bss, 3585 struct ieee80211_sub_if_data, u.ap); 3586 3587 __skb_queue_tail(&tx.skbs, skb); 3588 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3589 return true; 3590 } 3591 3592 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3593 struct ieee80211_txq *txq) 3594 { 3595 struct ieee80211_local *local = hw_to_local(hw); 3596 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3597 struct ieee80211_hdr *hdr; 3598 struct sk_buff *skb = NULL; 3599 struct fq *fq = &local->fq; 3600 struct fq_tin *tin = &txqi->tin; 3601 struct ieee80211_tx_info *info; 3602 struct ieee80211_tx_data tx; 3603 ieee80211_tx_result r; 3604 struct ieee80211_vif *vif = txq->vif; 3605 3606 WARN_ON_ONCE(softirq_count() == 0); 3607 3608 if (!ieee80211_txq_airtime_check(hw, txq)) 3609 return NULL; 3610 3611 begin: 3612 spin_lock_bh(&fq->lock); 3613 3614 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3615 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3616 goto out; 3617 3618 if (vif->txqs_stopped[txq->ac]) { 3619 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3620 goto out; 3621 } 3622 3623 /* Make sure fragments stay together. */ 3624 skb = __skb_dequeue(&txqi->frags); 3625 if (unlikely(skb)) { 3626 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3627 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3628 goto out; 3629 IEEE80211_SKB_CB(skb)->control.flags &= 3630 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3631 } else { 3632 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3633 } 3634 3635 if (!skb) 3636 goto out; 3637 3638 spin_unlock_bh(&fq->lock); 3639 3640 hdr = (struct ieee80211_hdr *)skb->data; 3641 info = IEEE80211_SKB_CB(skb); 3642 3643 memset(&tx, 0, sizeof(tx)); 3644 __skb_queue_head_init(&tx.skbs); 3645 tx.local = local; 3646 tx.skb = skb; 3647 tx.sdata = vif_to_sdata(info->control.vif); 3648 3649 if (txq->sta) { 3650 tx.sta = container_of(txq->sta, struct sta_info, sta); 3651 /* 3652 * Drop unicast frames to unauthorised stations unless they are 3653 * injected frames or EAPOL frames from the local station. 3654 */ 3655 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3656 ieee80211_is_data(hdr->frame_control) && 3657 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3658 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3659 !is_multicast_ether_addr(hdr->addr1) && 3660 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3661 (!(info->control.flags & 3662 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3663 !ether_addr_equal(tx.sdata->vif.addr, 3664 hdr->addr2)))) { 3665 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3666 ieee80211_free_txskb(&local->hw, skb); 3667 goto begin; 3668 } 3669 } 3670 3671 /* 3672 * The key can be removed while the packet was queued, so need to call 3673 * this here to get the current key. 3674 */ 3675 r = ieee80211_tx_h_select_key(&tx); 3676 if (r != TX_CONTINUE) { 3677 ieee80211_free_txskb(&local->hw, skb); 3678 goto begin; 3679 } 3680 3681 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3682 info->flags |= IEEE80211_TX_CTL_AMPDU; 3683 else 3684 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3685 3686 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3687 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3688 r = ieee80211_tx_h_rate_ctrl(&tx); 3689 if (r != TX_CONTINUE) { 3690 ieee80211_free_txskb(&local->hw, skb); 3691 goto begin; 3692 } 3693 } 3694 goto encap_out; 3695 } 3696 3697 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3698 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3699 sta); 3700 u8 pn_offs = 0; 3701 3702 if (tx.key && 3703 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3704 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3705 3706 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3707 tx.key, &tx); 3708 if (r != TX_CONTINUE) { 3709 ieee80211_free_txskb(&local->hw, skb); 3710 goto begin; 3711 } 3712 } else { 3713 if (invoke_tx_handlers_late(&tx)) 3714 goto begin; 3715 3716 skb = __skb_dequeue(&tx.skbs); 3717 3718 if (!skb_queue_empty(&tx.skbs)) { 3719 spin_lock_bh(&fq->lock); 3720 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3721 spin_unlock_bh(&fq->lock); 3722 } 3723 } 3724 3725 if (skb_has_frag_list(skb) && 3726 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3727 if (skb_linearize(skb)) { 3728 ieee80211_free_txskb(&local->hw, skb); 3729 goto begin; 3730 } 3731 } 3732 3733 switch (tx.sdata->vif.type) { 3734 case NL80211_IFTYPE_MONITOR: 3735 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3736 vif = &tx.sdata->vif; 3737 break; 3738 } 3739 tx.sdata = rcu_dereference(local->monitor_sdata); 3740 if (tx.sdata) { 3741 vif = &tx.sdata->vif; 3742 info->hw_queue = 3743 vif->hw_queue[skb_get_queue_mapping(skb)]; 3744 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3745 ieee80211_free_txskb(&local->hw, skb); 3746 goto begin; 3747 } else { 3748 vif = NULL; 3749 } 3750 break; 3751 case NL80211_IFTYPE_AP_VLAN: 3752 tx.sdata = container_of(tx.sdata->bss, 3753 struct ieee80211_sub_if_data, u.ap); 3754 fallthrough; 3755 default: 3756 vif = &tx.sdata->vif; 3757 break; 3758 } 3759 3760 encap_out: 3761 IEEE80211_SKB_CB(skb)->control.vif = vif; 3762 3763 if (tx.sta && 3764 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3765 bool ampdu = txq->ac != IEEE80211_AC_VO; 3766 u32 airtime; 3767 3768 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3769 skb->len, ampdu); 3770 if (airtime) { 3771 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3772 ieee80211_sta_update_pending_airtime(local, tx.sta, 3773 txq->ac, 3774 airtime, 3775 false); 3776 } 3777 } 3778 3779 return skb; 3780 3781 out: 3782 spin_unlock_bh(&fq->lock); 3783 3784 return skb; 3785 } 3786 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3787 3788 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3789 { 3790 struct airtime_info *air_info = &sta->airtime[ac]; 3791 3792 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3793 } 3794 3795 static void 3796 ieee80211_txq_set_active(struct txq_info *txqi) 3797 { 3798 struct sta_info *sta; 3799 3800 if (!txqi->txq.sta) 3801 return; 3802 3803 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3804 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 3805 } 3806 3807 static bool 3808 ieee80211_txq_keep_active(struct txq_info *txqi) 3809 { 3810 struct sta_info *sta; 3811 u32 diff; 3812 3813 if (!txqi->txq.sta) 3814 return false; 3815 3816 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3817 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 3818 return false; 3819 3820 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 3821 3822 return diff <= AIRTIME_ACTIVE_DURATION; 3823 } 3824 3825 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3826 { 3827 struct ieee80211_local *local = hw_to_local(hw); 3828 struct ieee80211_txq *ret = NULL; 3829 struct txq_info *txqi = NULL, *head = NULL; 3830 bool found_eligible_txq = false; 3831 3832 spin_lock_bh(&local->active_txq_lock[ac]); 3833 3834 if (!local->schedule_round[ac]) 3835 goto out; 3836 3837 begin: 3838 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3839 struct txq_info, 3840 schedule_order); 3841 if (!txqi) 3842 goto out; 3843 3844 if (txqi == head) { 3845 if (!found_eligible_txq) 3846 goto out; 3847 else 3848 found_eligible_txq = false; 3849 } 3850 3851 if (!head) 3852 head = txqi; 3853 3854 if (txqi->txq.sta) { 3855 struct sta_info *sta = container_of(txqi->txq.sta, 3856 struct sta_info, sta); 3857 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3858 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 3859 3860 if (aql_check) 3861 found_eligible_txq = true; 3862 3863 if (deficit < 0) 3864 sta->airtime[txqi->txq.ac].deficit += 3865 sta->airtime_weight; 3866 3867 if (deficit < 0 || !aql_check) { 3868 list_move_tail(&txqi->schedule_order, 3869 &local->active_txqs[txqi->txq.ac]); 3870 goto begin; 3871 } 3872 } 3873 3874 if (txqi->schedule_round == local->schedule_round[ac]) 3875 goto out; 3876 3877 list_del_init(&txqi->schedule_order); 3878 txqi->schedule_round = local->schedule_round[ac]; 3879 ret = &txqi->txq; 3880 3881 out: 3882 spin_unlock_bh(&local->active_txq_lock[ac]); 3883 return ret; 3884 } 3885 EXPORT_SYMBOL(ieee80211_next_txq); 3886 3887 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3888 struct ieee80211_txq *txq, 3889 bool force) 3890 { 3891 struct ieee80211_local *local = hw_to_local(hw); 3892 struct txq_info *txqi = to_txq_info(txq); 3893 bool has_queue; 3894 3895 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3896 3897 has_queue = force || txq_has_queue(txq); 3898 if (list_empty(&txqi->schedule_order) && 3899 (has_queue || ieee80211_txq_keep_active(txqi))) { 3900 /* If airtime accounting is active, always enqueue STAs at the 3901 * head of the list to ensure that they only get moved to the 3902 * back by the airtime DRR scheduler once they have a negative 3903 * deficit. A station that already has a negative deficit will 3904 * get immediately moved to the back of the list on the next 3905 * call to ieee80211_next_txq(). 3906 */ 3907 if (txqi->txq.sta && local->airtime_flags && has_queue && 3908 wiphy_ext_feature_isset(local->hw.wiphy, 3909 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3910 list_add(&txqi->schedule_order, 3911 &local->active_txqs[txq->ac]); 3912 else 3913 list_add_tail(&txqi->schedule_order, 3914 &local->active_txqs[txq->ac]); 3915 if (has_queue) 3916 ieee80211_txq_set_active(txqi); 3917 } 3918 3919 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3920 } 3921 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3922 3923 DEFINE_STATIC_KEY_FALSE(aql_disable); 3924 3925 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 3926 struct ieee80211_txq *txq) 3927 { 3928 struct sta_info *sta; 3929 struct ieee80211_local *local = hw_to_local(hw); 3930 3931 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3932 return true; 3933 3934 if (static_branch_unlikely(&aql_disable)) 3935 return true; 3936 3937 if (!txq->sta) 3938 return true; 3939 3940 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 3941 return true; 3942 3943 sta = container_of(txq->sta, struct sta_info, sta); 3944 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3945 sta->airtime[txq->ac].aql_limit_low) 3946 return true; 3947 3948 if (atomic_read(&local->aql_total_pending_airtime) < 3949 local->aql_threshold && 3950 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 3951 sta->airtime[txq->ac].aql_limit_high) 3952 return true; 3953 3954 return false; 3955 } 3956 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 3957 3958 static bool 3959 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 3960 { 3961 unsigned int num_txq = 0; 3962 struct txq_info *txq; 3963 u32 aql_limit; 3964 3965 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 3966 return true; 3967 3968 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 3969 num_txq++; 3970 3971 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 3972 local->aql_txq_limit_high[ac]; 3973 3974 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 3975 } 3976 3977 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 3978 struct ieee80211_txq *txq) 3979 { 3980 struct ieee80211_local *local = hw_to_local(hw); 3981 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 3982 struct sta_info *sta; 3983 u8 ac = txq->ac; 3984 3985 spin_lock_bh(&local->active_txq_lock[ac]); 3986 3987 if (!txqi->txq.sta) 3988 goto out; 3989 3990 if (list_empty(&txqi->schedule_order)) 3991 goto out; 3992 3993 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 3994 goto out; 3995 3996 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 3997 schedule_order) { 3998 if (iter == txqi) 3999 break; 4000 4001 if (!iter->txq.sta) { 4002 list_move_tail(&iter->schedule_order, 4003 &local->active_txqs[ac]); 4004 continue; 4005 } 4006 sta = container_of(iter->txq.sta, struct sta_info, sta); 4007 if (ieee80211_sta_deficit(sta, ac) < 0) 4008 sta->airtime[ac].deficit += sta->airtime_weight; 4009 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4010 } 4011 4012 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4013 if (sta->airtime[ac].deficit >= 0) 4014 goto out; 4015 4016 sta->airtime[ac].deficit += sta->airtime_weight; 4017 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4018 spin_unlock_bh(&local->active_txq_lock[ac]); 4019 4020 return false; 4021 out: 4022 if (!list_empty(&txqi->schedule_order)) 4023 list_del_init(&txqi->schedule_order); 4024 spin_unlock_bh(&local->active_txq_lock[ac]); 4025 4026 return true; 4027 } 4028 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4029 4030 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4031 { 4032 struct ieee80211_local *local = hw_to_local(hw); 4033 4034 spin_lock_bh(&local->active_txq_lock[ac]); 4035 4036 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4037 local->schedule_round[ac]++; 4038 if (!local->schedule_round[ac]) 4039 local->schedule_round[ac]++; 4040 } else { 4041 local->schedule_round[ac] = 0; 4042 } 4043 4044 spin_unlock_bh(&local->active_txq_lock[ac]); 4045 } 4046 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4047 4048 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4049 struct net_device *dev, 4050 u32 info_flags, 4051 u32 ctrl_flags, 4052 u64 *cookie) 4053 { 4054 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4055 struct ieee80211_local *local = sdata->local; 4056 struct sta_info *sta; 4057 struct sk_buff *next; 4058 int len = skb->len; 4059 4060 if (unlikely(skb->len < ETH_HLEN)) { 4061 kfree_skb(skb); 4062 return; 4063 } 4064 4065 rcu_read_lock(); 4066 4067 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4068 goto out_free; 4069 4070 if (IS_ERR(sta)) 4071 sta = NULL; 4072 4073 if (local->ops->wake_tx_queue) { 4074 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4075 skb_set_queue_mapping(skb, queue); 4076 skb_get_hash(skb); 4077 } 4078 4079 ieee80211_aggr_check(sdata, sta, skb); 4080 4081 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4082 4083 if (sta) { 4084 struct ieee80211_fast_tx *fast_tx; 4085 4086 fast_tx = rcu_dereference(sta->fast_tx); 4087 4088 if (fast_tx && 4089 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4090 goto out; 4091 } 4092 4093 if (skb_is_gso(skb)) { 4094 struct sk_buff *segs; 4095 4096 segs = skb_gso_segment(skb, 0); 4097 if (IS_ERR(segs)) { 4098 goto out_free; 4099 } else if (segs) { 4100 consume_skb(skb); 4101 skb = segs; 4102 } 4103 } else { 4104 /* we cannot process non-linear frames on this path */ 4105 if (skb_linearize(skb)) 4106 goto out_free; 4107 4108 /* the frame could be fragmented, software-encrypted, and other 4109 * things so we cannot really handle checksum offload with it - 4110 * fix it up in software before we handle anything else. 4111 */ 4112 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4113 skb_set_transport_header(skb, 4114 skb_checksum_start_offset(skb)); 4115 if (skb_checksum_help(skb)) 4116 goto out_free; 4117 } 4118 } 4119 4120 skb_list_walk_safe(skb, skb, next) { 4121 skb_mark_not_on_list(skb); 4122 4123 if (skb->protocol == sdata->control_port_protocol) 4124 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4125 4126 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4127 sta, ctrl_flags, cookie); 4128 if (IS_ERR(skb)) { 4129 kfree_skb_list(next); 4130 goto out; 4131 } 4132 4133 dev_sw_netstats_tx_add(dev, 1, skb->len); 4134 4135 ieee80211_xmit(sdata, sta, skb); 4136 } 4137 goto out; 4138 out_free: 4139 kfree_skb(skb); 4140 len = 0; 4141 out: 4142 if (len) 4143 ieee80211_tpt_led_trig_tx(local, len); 4144 rcu_read_unlock(); 4145 } 4146 4147 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4148 { 4149 struct ethhdr *eth; 4150 int err; 4151 4152 err = skb_ensure_writable(skb, ETH_HLEN); 4153 if (unlikely(err)) 4154 return err; 4155 4156 eth = (void *)skb->data; 4157 ether_addr_copy(eth->h_dest, sta->sta.addr); 4158 4159 return 0; 4160 } 4161 4162 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4163 struct net_device *dev) 4164 { 4165 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4166 const struct ethhdr *eth = (void *)skb->data; 4167 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4168 __be16 ethertype; 4169 4170 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4171 return false; 4172 4173 switch (sdata->vif.type) { 4174 case NL80211_IFTYPE_AP_VLAN: 4175 if (sdata->u.vlan.sta) 4176 return false; 4177 if (sdata->wdev.use_4addr) 4178 return false; 4179 fallthrough; 4180 case NL80211_IFTYPE_AP: 4181 /* check runtime toggle for this bss */ 4182 if (!sdata->bss->multicast_to_unicast) 4183 return false; 4184 break; 4185 default: 4186 return false; 4187 } 4188 4189 /* multicast to unicast conversion only for some payload */ 4190 ethertype = eth->h_proto; 4191 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4192 ethertype = ethvlan->h_vlan_encapsulated_proto; 4193 switch (ethertype) { 4194 case htons(ETH_P_ARP): 4195 case htons(ETH_P_IP): 4196 case htons(ETH_P_IPV6): 4197 break; 4198 default: 4199 return false; 4200 } 4201 4202 return true; 4203 } 4204 4205 static void 4206 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4207 struct sk_buff_head *queue) 4208 { 4209 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4210 struct ieee80211_local *local = sdata->local; 4211 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4212 struct sta_info *sta, *first = NULL; 4213 struct sk_buff *cloned_skb; 4214 4215 rcu_read_lock(); 4216 4217 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4218 if (sdata != sta->sdata) 4219 /* AP-VLAN mismatch */ 4220 continue; 4221 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4222 /* do not send back to source */ 4223 continue; 4224 if (!first) { 4225 first = sta; 4226 continue; 4227 } 4228 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4229 if (!cloned_skb) 4230 goto multicast; 4231 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4232 dev_kfree_skb(cloned_skb); 4233 goto multicast; 4234 } 4235 __skb_queue_tail(queue, cloned_skb); 4236 } 4237 4238 if (likely(first)) { 4239 if (unlikely(ieee80211_change_da(skb, first))) 4240 goto multicast; 4241 __skb_queue_tail(queue, skb); 4242 } else { 4243 /* no STA connected, drop */ 4244 kfree_skb(skb); 4245 skb = NULL; 4246 } 4247 4248 goto out; 4249 multicast: 4250 __skb_queue_purge(queue); 4251 __skb_queue_tail(queue, skb); 4252 out: 4253 rcu_read_unlock(); 4254 } 4255 4256 /** 4257 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4258 * @skb: packet to be sent 4259 * @dev: incoming interface 4260 * 4261 * On failure skb will be freed. 4262 */ 4263 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4264 struct net_device *dev) 4265 { 4266 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4267 struct sk_buff_head queue; 4268 4269 __skb_queue_head_init(&queue); 4270 ieee80211_convert_to_unicast(skb, dev, &queue); 4271 while ((skb = __skb_dequeue(&queue))) 4272 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4273 } else { 4274 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4275 } 4276 4277 return NETDEV_TX_OK; 4278 } 4279 4280 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4281 struct sk_buff *skb, struct sta_info *sta, 4282 bool txpending) 4283 { 4284 struct ieee80211_local *local = sdata->local; 4285 struct ieee80211_tx_control control = {}; 4286 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4287 struct ieee80211_sta *pubsta = NULL; 4288 unsigned long flags; 4289 int q = info->hw_queue; 4290 4291 if (sta) 4292 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4293 4294 ieee80211_tpt_led_trig_tx(local, skb->len); 4295 4296 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4297 return true; 4298 4299 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4300 4301 if (local->queue_stop_reasons[q] || 4302 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4303 if (txpending) 4304 skb_queue_head(&local->pending[q], skb); 4305 else 4306 skb_queue_tail(&local->pending[q], skb); 4307 4308 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4309 4310 return false; 4311 } 4312 4313 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4314 4315 if (sta && sta->uploaded) 4316 pubsta = &sta->sta; 4317 4318 control.sta = pubsta; 4319 4320 drv_tx(local, &control, skb); 4321 4322 return true; 4323 } 4324 4325 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4326 struct net_device *dev, struct sta_info *sta, 4327 struct ieee80211_key *key, struct sk_buff *skb) 4328 { 4329 struct ieee80211_tx_info *info; 4330 struct ieee80211_local *local = sdata->local; 4331 struct tid_ampdu_tx *tid_tx; 4332 u8 tid; 4333 4334 if (local->ops->wake_tx_queue) { 4335 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4336 skb_set_queue_mapping(skb, queue); 4337 skb_get_hash(skb); 4338 } 4339 4340 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4341 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4342 goto out_free; 4343 4344 skb = skb_share_check(skb, GFP_ATOMIC); 4345 if (unlikely(!skb)) 4346 return; 4347 4348 info = IEEE80211_SKB_CB(skb); 4349 memset(info, 0, sizeof(*info)); 4350 4351 ieee80211_aggr_check(sdata, sta, skb); 4352 4353 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4354 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4355 if (tid_tx) { 4356 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4357 /* fall back to non-offload slow path */ 4358 __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL); 4359 return; 4360 } 4361 4362 info->flags |= IEEE80211_TX_CTL_AMPDU; 4363 if (tid_tx->timeout) 4364 tid_tx->last_tx = jiffies; 4365 } 4366 4367 if (unlikely(skb->sk && 4368 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4369 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4370 &info->flags, NULL); 4371 4372 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4373 4374 dev_sw_netstats_tx_add(dev, 1, skb->len); 4375 4376 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4377 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 4378 4379 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4380 sdata = container_of(sdata->bss, 4381 struct ieee80211_sub_if_data, u.ap); 4382 4383 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4384 info->control.vif = &sdata->vif; 4385 4386 if (key) 4387 info->control.hw_key = &key->conf; 4388 4389 ieee80211_tx_8023(sdata, skb, sta, false); 4390 4391 return; 4392 4393 out_free: 4394 kfree_skb(skb); 4395 } 4396 4397 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4398 struct net_device *dev) 4399 { 4400 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4401 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4402 struct ieee80211_key *key; 4403 struct sta_info *sta; 4404 4405 if (unlikely(skb->len < ETH_HLEN)) { 4406 kfree_skb(skb); 4407 return NETDEV_TX_OK; 4408 } 4409 4410 rcu_read_lock(); 4411 4412 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4413 kfree_skb(skb); 4414 goto out; 4415 } 4416 4417 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4418 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4419 sdata->control_port_protocol == ehdr->h_proto)) 4420 goto skip_offload; 4421 4422 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4423 if (!key) 4424 key = rcu_dereference(sdata->default_unicast_key); 4425 4426 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4427 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4428 goto skip_offload; 4429 4430 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4431 goto out; 4432 4433 skip_offload: 4434 ieee80211_subif_start_xmit(skb, dev); 4435 out: 4436 rcu_read_unlock(); 4437 4438 return NETDEV_TX_OK; 4439 } 4440 4441 struct sk_buff * 4442 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4443 struct sk_buff *skb, u32 info_flags) 4444 { 4445 struct ieee80211_hdr *hdr; 4446 struct ieee80211_tx_data tx = { 4447 .local = sdata->local, 4448 .sdata = sdata, 4449 }; 4450 struct sta_info *sta; 4451 4452 rcu_read_lock(); 4453 4454 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4455 kfree_skb(skb); 4456 skb = ERR_PTR(-EINVAL); 4457 goto out; 4458 } 4459 4460 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 0, NULL); 4461 if (IS_ERR(skb)) 4462 goto out; 4463 4464 hdr = (void *)skb->data; 4465 tx.sta = sta_info_get(sdata, hdr->addr1); 4466 tx.skb = skb; 4467 4468 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4469 rcu_read_unlock(); 4470 kfree_skb(skb); 4471 return ERR_PTR(-EINVAL); 4472 } 4473 4474 out: 4475 rcu_read_unlock(); 4476 return skb; 4477 } 4478 4479 /* 4480 * ieee80211_clear_tx_pending may not be called in a context where 4481 * it is possible that it packets could come in again. 4482 */ 4483 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4484 { 4485 struct sk_buff *skb; 4486 int i; 4487 4488 for (i = 0; i < local->hw.queues; i++) { 4489 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4490 ieee80211_free_txskb(&local->hw, skb); 4491 } 4492 } 4493 4494 /* 4495 * Returns false if the frame couldn't be transmitted but was queued instead, 4496 * which in this case means re-queued -- take as an indication to stop sending 4497 * more pending frames. 4498 */ 4499 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4500 struct sk_buff *skb) 4501 { 4502 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4503 struct ieee80211_sub_if_data *sdata; 4504 struct sta_info *sta; 4505 struct ieee80211_hdr *hdr; 4506 bool result; 4507 struct ieee80211_chanctx_conf *chanctx_conf; 4508 4509 sdata = vif_to_sdata(info->control.vif); 4510 4511 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4512 /* update band only for non-MLD */ 4513 if (!sdata->vif.valid_links) { 4514 chanctx_conf = 4515 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4516 if (unlikely(!chanctx_conf)) { 4517 dev_kfree_skb(skb); 4518 return true; 4519 } 4520 info->band = chanctx_conf->def.chan->band; 4521 } 4522 result = ieee80211_tx(sdata, NULL, skb, true); 4523 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4524 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4525 dev_kfree_skb(skb); 4526 return true; 4527 } 4528 4529 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4530 sta = NULL; 4531 4532 result = ieee80211_tx_8023(sdata, skb, sta, true); 4533 } else { 4534 struct sk_buff_head skbs; 4535 4536 __skb_queue_head_init(&skbs); 4537 __skb_queue_tail(&skbs, skb); 4538 4539 hdr = (struct ieee80211_hdr *)skb->data; 4540 sta = sta_info_get(sdata, hdr->addr1); 4541 4542 result = __ieee80211_tx(local, &skbs, sta, true); 4543 } 4544 4545 return result; 4546 } 4547 4548 /* 4549 * Transmit all pending packets. Called from tasklet. 4550 */ 4551 void ieee80211_tx_pending(struct tasklet_struct *t) 4552 { 4553 struct ieee80211_local *local = from_tasklet(local, t, 4554 tx_pending_tasklet); 4555 unsigned long flags; 4556 int i; 4557 bool txok; 4558 4559 rcu_read_lock(); 4560 4561 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4562 for (i = 0; i < local->hw.queues; i++) { 4563 /* 4564 * If queue is stopped by something other than due to pending 4565 * frames, or we have no pending frames, proceed to next queue. 4566 */ 4567 if (local->queue_stop_reasons[i] || 4568 skb_queue_empty(&local->pending[i])) 4569 continue; 4570 4571 while (!skb_queue_empty(&local->pending[i])) { 4572 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4573 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4574 4575 if (WARN_ON(!info->control.vif)) { 4576 ieee80211_free_txskb(&local->hw, skb); 4577 continue; 4578 } 4579 4580 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4581 flags); 4582 4583 txok = ieee80211_tx_pending_skb(local, skb); 4584 spin_lock_irqsave(&local->queue_stop_reason_lock, 4585 flags); 4586 if (!txok) 4587 break; 4588 } 4589 4590 if (skb_queue_empty(&local->pending[i])) 4591 ieee80211_propagate_queue_wake(local, i); 4592 } 4593 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4594 4595 rcu_read_unlock(); 4596 } 4597 4598 /* functions for drivers to get certain frames */ 4599 4600 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4601 struct ieee80211_link_data *link, 4602 struct ps_data *ps, struct sk_buff *skb, 4603 bool is_template) 4604 { 4605 u8 *pos, *tim; 4606 int aid0 = 0; 4607 int i, have_bits = 0, n1, n2; 4608 struct ieee80211_bss_conf *link_conf = link->conf; 4609 4610 /* Generate bitmap for TIM only if there are any STAs in power save 4611 * mode. */ 4612 if (atomic_read(&ps->num_sta_ps) > 0) 4613 /* in the hope that this is faster than 4614 * checking byte-for-byte */ 4615 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4616 IEEE80211_MAX_AID+1); 4617 if (!is_template) { 4618 if (ps->dtim_count == 0) 4619 ps->dtim_count = link_conf->dtim_period - 1; 4620 else 4621 ps->dtim_count--; 4622 } 4623 4624 tim = pos = skb_put(skb, 6); 4625 *pos++ = WLAN_EID_TIM; 4626 *pos++ = 4; 4627 *pos++ = ps->dtim_count; 4628 *pos++ = link_conf->dtim_period; 4629 4630 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4631 aid0 = 1; 4632 4633 ps->dtim_bc_mc = aid0 == 1; 4634 4635 if (have_bits) { 4636 /* Find largest even number N1 so that bits numbered 1 through 4637 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4638 * (N2 + 1) x 8 through 2007 are 0. */ 4639 n1 = 0; 4640 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4641 if (ps->tim[i]) { 4642 n1 = i & 0xfe; 4643 break; 4644 } 4645 } 4646 n2 = n1; 4647 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4648 if (ps->tim[i]) { 4649 n2 = i; 4650 break; 4651 } 4652 } 4653 4654 /* Bitmap control */ 4655 *pos++ = n1 | aid0; 4656 /* Part Virt Bitmap */ 4657 skb_put(skb, n2 - n1); 4658 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4659 4660 tim[1] = n2 - n1 + 4; 4661 } else { 4662 *pos++ = aid0; /* Bitmap control */ 4663 *pos++ = 0; /* Part Virt Bitmap */ 4664 } 4665 } 4666 4667 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4668 struct ieee80211_link_data *link, 4669 struct ps_data *ps, struct sk_buff *skb, 4670 bool is_template) 4671 { 4672 struct ieee80211_local *local = sdata->local; 4673 4674 /* 4675 * Not very nice, but we want to allow the driver to call 4676 * ieee80211_beacon_get() as a response to the set_tim() 4677 * callback. That, however, is already invoked under the 4678 * sta_lock to guarantee consistent and race-free update 4679 * of the tim bitmap in mac80211 and the driver. 4680 */ 4681 if (local->tim_in_locked_section) { 4682 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4683 } else { 4684 spin_lock_bh(&local->tim_lock); 4685 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4686 spin_unlock_bh(&local->tim_lock); 4687 } 4688 4689 return 0; 4690 } 4691 4692 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4693 struct beacon_data *beacon, 4694 struct ieee80211_link_data *link) 4695 { 4696 u8 *beacon_data, count, max_count = 1; 4697 struct probe_resp *resp; 4698 size_t beacon_data_len; 4699 u16 *bcn_offsets; 4700 int i; 4701 4702 switch (sdata->vif.type) { 4703 case NL80211_IFTYPE_AP: 4704 beacon_data = beacon->tail; 4705 beacon_data_len = beacon->tail_len; 4706 break; 4707 case NL80211_IFTYPE_ADHOC: 4708 beacon_data = beacon->head; 4709 beacon_data_len = beacon->head_len; 4710 break; 4711 case NL80211_IFTYPE_MESH_POINT: 4712 beacon_data = beacon->head; 4713 beacon_data_len = beacon->head_len; 4714 break; 4715 default: 4716 return; 4717 } 4718 4719 resp = rcu_dereference(link->u.ap.probe_resp); 4720 4721 bcn_offsets = beacon->cntdwn_counter_offsets; 4722 count = beacon->cntdwn_current_counter; 4723 if (link->conf->csa_active) 4724 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4725 4726 for (i = 0; i < max_count; ++i) { 4727 if (bcn_offsets[i]) { 4728 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 4729 return; 4730 beacon_data[bcn_offsets[i]] = count; 4731 } 4732 4733 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4734 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4735 4736 resp->data[resp_offsets[i]] = count; 4737 } 4738 } 4739 } 4740 4741 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4742 { 4743 beacon->cntdwn_current_counter--; 4744 4745 /* the counter should never reach 0 */ 4746 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4747 4748 return beacon->cntdwn_current_counter; 4749 } 4750 4751 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4752 { 4753 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4754 struct beacon_data *beacon = NULL; 4755 u8 count = 0; 4756 4757 rcu_read_lock(); 4758 4759 if (sdata->vif.type == NL80211_IFTYPE_AP) 4760 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4761 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4762 beacon = rcu_dereference(sdata->u.ibss.presp); 4763 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4764 beacon = rcu_dereference(sdata->u.mesh.beacon); 4765 4766 if (!beacon) 4767 goto unlock; 4768 4769 count = __ieee80211_beacon_update_cntdwn(beacon); 4770 4771 unlock: 4772 rcu_read_unlock(); 4773 return count; 4774 } 4775 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4776 4777 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4778 { 4779 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4780 struct beacon_data *beacon = NULL; 4781 4782 rcu_read_lock(); 4783 4784 if (sdata->vif.type == NL80211_IFTYPE_AP) 4785 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4786 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4787 beacon = rcu_dereference(sdata->u.ibss.presp); 4788 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4789 beacon = rcu_dereference(sdata->u.mesh.beacon); 4790 4791 if (!beacon) 4792 goto unlock; 4793 4794 if (counter < beacon->cntdwn_current_counter) 4795 beacon->cntdwn_current_counter = counter; 4796 4797 unlock: 4798 rcu_read_unlock(); 4799 } 4800 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4801 4802 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4803 { 4804 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4805 struct beacon_data *beacon = NULL; 4806 u8 *beacon_data; 4807 size_t beacon_data_len; 4808 int ret = false; 4809 4810 if (!ieee80211_sdata_running(sdata)) 4811 return false; 4812 4813 rcu_read_lock(); 4814 if (vif->type == NL80211_IFTYPE_AP) { 4815 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4816 if (WARN_ON(!beacon || !beacon->tail)) 4817 goto out; 4818 beacon_data = beacon->tail; 4819 beacon_data_len = beacon->tail_len; 4820 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4821 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4822 4823 beacon = rcu_dereference(ifibss->presp); 4824 if (!beacon) 4825 goto out; 4826 4827 beacon_data = beacon->head; 4828 beacon_data_len = beacon->head_len; 4829 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4830 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4831 4832 beacon = rcu_dereference(ifmsh->beacon); 4833 if (!beacon) 4834 goto out; 4835 4836 beacon_data = beacon->head; 4837 beacon_data_len = beacon->head_len; 4838 } else { 4839 WARN_ON(1); 4840 goto out; 4841 } 4842 4843 if (!beacon->cntdwn_counter_offsets[0]) 4844 goto out; 4845 4846 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4847 goto out; 4848 4849 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4850 ret = true; 4851 4852 out: 4853 rcu_read_unlock(); 4854 4855 return ret; 4856 } 4857 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4858 4859 static int ieee80211_beacon_protect(struct sk_buff *skb, 4860 struct ieee80211_local *local, 4861 struct ieee80211_sub_if_data *sdata, 4862 struct ieee80211_link_data *link) 4863 { 4864 ieee80211_tx_result res; 4865 struct ieee80211_tx_data tx; 4866 struct sk_buff *check_skb; 4867 4868 memset(&tx, 0, sizeof(tx)); 4869 tx.key = rcu_dereference(link->default_beacon_key); 4870 if (!tx.key) 4871 return 0; 4872 tx.local = local; 4873 tx.sdata = sdata; 4874 __skb_queue_head_init(&tx.skbs); 4875 __skb_queue_tail(&tx.skbs, skb); 4876 res = ieee80211_tx_h_encrypt(&tx); 4877 check_skb = __skb_dequeue(&tx.skbs); 4878 /* we may crash after this, but it'd be a bug in crypto */ 4879 WARN_ON(check_skb != skb); 4880 if (WARN_ON_ONCE(res != TX_CONTINUE)) 4881 return -EINVAL; 4882 4883 return 0; 4884 } 4885 4886 static void 4887 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 4888 struct ieee80211_vif *vif, 4889 struct ieee80211_link_data *link, 4890 struct ieee80211_mutable_offsets *offs, 4891 struct beacon_data *beacon, 4892 struct sk_buff *skb, 4893 struct ieee80211_chanctx_conf *chanctx_conf, 4894 u16 csa_off_base) 4895 { 4896 struct ieee80211_local *local = hw_to_local(hw); 4897 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4898 struct ieee80211_tx_info *info; 4899 enum nl80211_band band; 4900 struct ieee80211_tx_rate_control txrc; 4901 4902 /* CSA offsets */ 4903 if (offs && beacon) { 4904 u16 i; 4905 4906 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 4907 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 4908 4909 if (!csa_off) 4910 continue; 4911 4912 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 4913 } 4914 } 4915 4916 band = chanctx_conf->def.chan->band; 4917 info = IEEE80211_SKB_CB(skb); 4918 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 4919 info->flags |= IEEE80211_TX_CTL_NO_ACK; 4920 info->band = band; 4921 4922 memset(&txrc, 0, sizeof(txrc)); 4923 txrc.hw = hw; 4924 txrc.sband = local->hw.wiphy->bands[band]; 4925 txrc.bss_conf = link->conf; 4926 txrc.skb = skb; 4927 txrc.reported_rate.idx = -1; 4928 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 4929 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 4930 else 4931 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 4932 txrc.bss = true; 4933 rate_control_get_rate(sdata, NULL, &txrc); 4934 4935 info->control.vif = vif; 4936 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 4937 IEEE80211_TX_CTL_ASSIGN_SEQ | 4938 IEEE80211_TX_CTL_FIRST_FRAGMENT; 4939 } 4940 4941 static void 4942 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon) 4943 { 4944 int i; 4945 4946 if (!beacon->mbssid_ies) 4947 return; 4948 4949 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 4950 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 4951 beacon->mbssid_ies->elem[i].len); 4952 } 4953 4954 static struct sk_buff * 4955 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 4956 struct ieee80211_vif *vif, 4957 struct ieee80211_link_data *link, 4958 struct ieee80211_mutable_offsets *offs, 4959 bool is_template, 4960 struct beacon_data *beacon, 4961 struct ieee80211_chanctx_conf *chanctx_conf) 4962 { 4963 struct ieee80211_local *local = hw_to_local(hw); 4964 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4965 struct ieee80211_if_ap *ap = &sdata->u.ap; 4966 struct sk_buff *skb = NULL; 4967 u16 csa_off_base = 0; 4968 int mbssid_len; 4969 4970 if (beacon->cntdwn_counter_offsets[0]) { 4971 if (!is_template) 4972 ieee80211_beacon_update_cntdwn(vif); 4973 4974 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 4975 } 4976 4977 /* headroom, head length, 4978 * tail length, maximum TIM length and multiple BSSID length 4979 */ 4980 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies); 4981 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 4982 beacon->tail_len + 256 + 4983 local->hw.extra_beacon_tailroom + mbssid_len); 4984 if (!skb) 4985 return NULL; 4986 4987 skb_reserve(skb, local->tx_headroom); 4988 skb_put_data(skb, beacon->head, beacon->head_len); 4989 4990 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 4991 4992 if (offs) { 4993 offs->tim_offset = beacon->head_len; 4994 offs->tim_length = skb->len - beacon->head_len; 4995 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 4996 4997 if (mbssid_len) { 4998 ieee80211_beacon_add_mbssid(skb, beacon); 4999 offs->mbssid_off = skb->len - mbssid_len; 5000 } 5001 5002 /* for AP the csa offsets are from tail */ 5003 csa_off_base = skb->len; 5004 } 5005 5006 if (beacon->tail) 5007 skb_put_data(skb, beacon->tail, beacon->tail_len); 5008 5009 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5010 return NULL; 5011 5012 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5013 chanctx_conf, csa_off_base); 5014 return skb; 5015 } 5016 5017 static struct sk_buff * 5018 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5019 struct ieee80211_vif *vif, 5020 struct ieee80211_mutable_offsets *offs, 5021 bool is_template, 5022 unsigned int link_id) 5023 { 5024 struct ieee80211_local *local = hw_to_local(hw); 5025 struct beacon_data *beacon = NULL; 5026 struct sk_buff *skb = NULL; 5027 struct ieee80211_sub_if_data *sdata = NULL; 5028 struct ieee80211_chanctx_conf *chanctx_conf; 5029 struct ieee80211_link_data *link; 5030 5031 rcu_read_lock(); 5032 5033 sdata = vif_to_sdata(vif); 5034 link = rcu_dereference(sdata->link[link_id]); 5035 if (!link) 5036 goto out; 5037 chanctx_conf = 5038 rcu_dereference(link->conf->chanctx_conf); 5039 5040 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5041 goto out; 5042 5043 if (offs) 5044 memset(offs, 0, sizeof(*offs)); 5045 5046 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5047 beacon = rcu_dereference(link->u.ap.beacon); 5048 if (!beacon) 5049 goto out; 5050 5051 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template, 5052 beacon, chanctx_conf); 5053 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5054 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5055 struct ieee80211_hdr *hdr; 5056 5057 beacon = rcu_dereference(ifibss->presp); 5058 if (!beacon) 5059 goto out; 5060 5061 if (beacon->cntdwn_counter_offsets[0]) { 5062 if (!is_template) 5063 __ieee80211_beacon_update_cntdwn(beacon); 5064 5065 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5066 } 5067 5068 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5069 local->hw.extra_beacon_tailroom); 5070 if (!skb) 5071 goto out; 5072 skb_reserve(skb, local->tx_headroom); 5073 skb_put_data(skb, beacon->head, beacon->head_len); 5074 5075 hdr = (struct ieee80211_hdr *) skb->data; 5076 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5077 IEEE80211_STYPE_BEACON); 5078 5079 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5080 chanctx_conf, 0); 5081 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5082 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5083 5084 beacon = rcu_dereference(ifmsh->beacon); 5085 if (!beacon) 5086 goto out; 5087 5088 if (beacon->cntdwn_counter_offsets[0]) { 5089 if (!is_template) 5090 /* TODO: For mesh csa_counter is in TU, so 5091 * decrementing it by one isn't correct, but 5092 * for now we leave it consistent with overall 5093 * mac80211's behavior. 5094 */ 5095 __ieee80211_beacon_update_cntdwn(beacon); 5096 5097 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5098 } 5099 5100 if (ifmsh->sync_ops) 5101 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5102 5103 skb = dev_alloc_skb(local->tx_headroom + 5104 beacon->head_len + 5105 256 + /* TIM IE */ 5106 beacon->tail_len + 5107 local->hw.extra_beacon_tailroom); 5108 if (!skb) 5109 goto out; 5110 skb_reserve(skb, local->tx_headroom); 5111 skb_put_data(skb, beacon->head, beacon->head_len); 5112 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5113 is_template); 5114 5115 if (offs) { 5116 offs->tim_offset = beacon->head_len; 5117 offs->tim_length = skb->len - beacon->head_len; 5118 } 5119 5120 skb_put_data(skb, beacon->tail, beacon->tail_len); 5121 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5122 chanctx_conf, 0); 5123 } else { 5124 WARN_ON(1); 5125 goto out; 5126 } 5127 5128 out: 5129 rcu_read_unlock(); 5130 return skb; 5131 5132 } 5133 5134 struct sk_buff * 5135 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5136 struct ieee80211_vif *vif, 5137 struct ieee80211_mutable_offsets *offs, 5138 unsigned int link_id) 5139 { 5140 return __ieee80211_beacon_get(hw, vif, offs, true, link_id); 5141 } 5142 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5143 5144 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5145 struct ieee80211_vif *vif, 5146 u16 *tim_offset, u16 *tim_length, 5147 unsigned int link_id) 5148 { 5149 struct ieee80211_mutable_offsets offs = {}; 5150 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5151 link_id); 5152 struct sk_buff *copy; 5153 int shift; 5154 5155 if (!bcn) 5156 return bcn; 5157 5158 if (tim_offset) 5159 *tim_offset = offs.tim_offset; 5160 5161 if (tim_length) 5162 *tim_length = offs.tim_length; 5163 5164 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5165 !hw_to_local(hw)->monitors) 5166 return bcn; 5167 5168 /* send a copy to monitor interfaces */ 5169 copy = skb_copy(bcn, GFP_ATOMIC); 5170 if (!copy) 5171 return bcn; 5172 5173 shift = ieee80211_vif_get_shift(vif); 5174 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5175 5176 return bcn; 5177 } 5178 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5179 5180 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5181 struct ieee80211_vif *vif) 5182 { 5183 struct sk_buff *skb = NULL; 5184 struct probe_resp *presp = NULL; 5185 struct ieee80211_hdr *hdr; 5186 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5187 5188 if (sdata->vif.type != NL80211_IFTYPE_AP) 5189 return NULL; 5190 5191 rcu_read_lock(); 5192 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5193 if (!presp) 5194 goto out; 5195 5196 skb = dev_alloc_skb(presp->len); 5197 if (!skb) 5198 goto out; 5199 5200 skb_put_data(skb, presp->data, presp->len); 5201 5202 hdr = (struct ieee80211_hdr *) skb->data; 5203 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5204 5205 out: 5206 rcu_read_unlock(); 5207 return skb; 5208 } 5209 EXPORT_SYMBOL(ieee80211_proberesp_get); 5210 5211 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5212 struct ieee80211_vif *vif) 5213 { 5214 struct sk_buff *skb = NULL; 5215 struct fils_discovery_data *tmpl = NULL; 5216 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5217 5218 if (sdata->vif.type != NL80211_IFTYPE_AP) 5219 return NULL; 5220 5221 rcu_read_lock(); 5222 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5223 if (!tmpl) { 5224 rcu_read_unlock(); 5225 return NULL; 5226 } 5227 5228 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5229 if (skb) { 5230 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5231 skb_put_data(skb, tmpl->data, tmpl->len); 5232 } 5233 5234 rcu_read_unlock(); 5235 return skb; 5236 } 5237 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5238 5239 struct sk_buff * 5240 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5241 struct ieee80211_vif *vif) 5242 { 5243 struct sk_buff *skb = NULL; 5244 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5245 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5246 5247 if (sdata->vif.type != NL80211_IFTYPE_AP) 5248 return NULL; 5249 5250 rcu_read_lock(); 5251 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5252 if (!tmpl) { 5253 rcu_read_unlock(); 5254 return NULL; 5255 } 5256 5257 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5258 if (skb) { 5259 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5260 skb_put_data(skb, tmpl->data, tmpl->len); 5261 } 5262 5263 rcu_read_unlock(); 5264 return skb; 5265 } 5266 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5267 5268 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5269 struct ieee80211_vif *vif) 5270 { 5271 struct ieee80211_sub_if_data *sdata; 5272 struct ieee80211_pspoll *pspoll; 5273 struct ieee80211_local *local; 5274 struct sk_buff *skb; 5275 5276 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5277 return NULL; 5278 5279 sdata = vif_to_sdata(vif); 5280 local = sdata->local; 5281 5282 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5283 if (!skb) 5284 return NULL; 5285 5286 skb_reserve(skb, local->hw.extra_tx_headroom); 5287 5288 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5289 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5290 IEEE80211_STYPE_PSPOLL); 5291 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5292 5293 /* aid in PS-Poll has its two MSBs each set to 1 */ 5294 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5295 5296 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5297 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5298 5299 return skb; 5300 } 5301 EXPORT_SYMBOL(ieee80211_pspoll_get); 5302 5303 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5304 struct ieee80211_vif *vif, 5305 bool qos_ok) 5306 { 5307 struct ieee80211_hdr_3addr *nullfunc; 5308 struct ieee80211_sub_if_data *sdata; 5309 struct ieee80211_local *local; 5310 struct sk_buff *skb; 5311 bool qos = false; 5312 5313 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5314 return NULL; 5315 5316 sdata = vif_to_sdata(vif); 5317 local = sdata->local; 5318 5319 if (qos_ok) { 5320 struct sta_info *sta; 5321 5322 rcu_read_lock(); 5323 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 5324 qos = sta && sta->sta.wme; 5325 rcu_read_unlock(); 5326 } 5327 5328 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5329 sizeof(*nullfunc) + 2); 5330 if (!skb) 5331 return NULL; 5332 5333 skb_reserve(skb, local->hw.extra_tx_headroom); 5334 5335 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5336 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5337 IEEE80211_STYPE_NULLFUNC | 5338 IEEE80211_FCTL_TODS); 5339 if (qos) { 5340 __le16 qoshdr = cpu_to_le16(7); 5341 5342 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5343 IEEE80211_STYPE_NULLFUNC) != 5344 IEEE80211_STYPE_QOS_NULLFUNC); 5345 nullfunc->frame_control |= 5346 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5347 skb->priority = 7; 5348 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5349 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5350 } 5351 5352 memcpy(nullfunc->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5353 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5354 memcpy(nullfunc->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5355 5356 return skb; 5357 } 5358 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5359 5360 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5361 const u8 *src_addr, 5362 const u8 *ssid, size_t ssid_len, 5363 size_t tailroom) 5364 { 5365 struct ieee80211_local *local = hw_to_local(hw); 5366 struct ieee80211_hdr_3addr *hdr; 5367 struct sk_buff *skb; 5368 size_t ie_ssid_len; 5369 u8 *pos; 5370 5371 ie_ssid_len = 2 + ssid_len; 5372 5373 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5374 ie_ssid_len + tailroom); 5375 if (!skb) 5376 return NULL; 5377 5378 skb_reserve(skb, local->hw.extra_tx_headroom); 5379 5380 hdr = skb_put_zero(skb, sizeof(*hdr)); 5381 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5382 IEEE80211_STYPE_PROBE_REQ); 5383 eth_broadcast_addr(hdr->addr1); 5384 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5385 eth_broadcast_addr(hdr->addr3); 5386 5387 pos = skb_put(skb, ie_ssid_len); 5388 *pos++ = WLAN_EID_SSID; 5389 *pos++ = ssid_len; 5390 if (ssid_len) 5391 memcpy(pos, ssid, ssid_len); 5392 pos += ssid_len; 5393 5394 return skb; 5395 } 5396 EXPORT_SYMBOL(ieee80211_probereq_get); 5397 5398 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5399 const void *frame, size_t frame_len, 5400 const struct ieee80211_tx_info *frame_txctl, 5401 struct ieee80211_rts *rts) 5402 { 5403 const struct ieee80211_hdr *hdr = frame; 5404 5405 rts->frame_control = 5406 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5407 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5408 frame_txctl); 5409 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5410 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5411 } 5412 EXPORT_SYMBOL(ieee80211_rts_get); 5413 5414 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5415 const void *frame, size_t frame_len, 5416 const struct ieee80211_tx_info *frame_txctl, 5417 struct ieee80211_cts *cts) 5418 { 5419 const struct ieee80211_hdr *hdr = frame; 5420 5421 cts->frame_control = 5422 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5423 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5424 frame_len, frame_txctl); 5425 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5426 } 5427 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5428 5429 struct sk_buff * 5430 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5431 struct ieee80211_vif *vif) 5432 { 5433 struct ieee80211_local *local = hw_to_local(hw); 5434 struct sk_buff *skb = NULL; 5435 struct ieee80211_tx_data tx; 5436 struct ieee80211_sub_if_data *sdata; 5437 struct ps_data *ps; 5438 struct ieee80211_tx_info *info; 5439 struct ieee80211_chanctx_conf *chanctx_conf; 5440 5441 sdata = vif_to_sdata(vif); 5442 5443 rcu_read_lock(); 5444 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5445 5446 if (!chanctx_conf) 5447 goto out; 5448 5449 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5450 struct beacon_data *beacon = 5451 rcu_dereference(sdata->deflink.u.ap.beacon); 5452 5453 if (!beacon || !beacon->head) 5454 goto out; 5455 5456 ps = &sdata->u.ap.ps; 5457 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5458 ps = &sdata->u.mesh.ps; 5459 } else { 5460 goto out; 5461 } 5462 5463 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5464 goto out; /* send buffered bc/mc only after DTIM beacon */ 5465 5466 while (1) { 5467 skb = skb_dequeue(&ps->bc_buf); 5468 if (!skb) 5469 goto out; 5470 local->total_ps_buffered--; 5471 5472 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5473 struct ieee80211_hdr *hdr = 5474 (struct ieee80211_hdr *) skb->data; 5475 /* more buffered multicast/broadcast frames ==> set 5476 * MoreData flag in IEEE 802.11 header to inform PS 5477 * STAs */ 5478 hdr->frame_control |= 5479 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5480 } 5481 5482 if (sdata->vif.type == NL80211_IFTYPE_AP) 5483 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5484 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5485 break; 5486 ieee80211_free_txskb(hw, skb); 5487 } 5488 5489 info = IEEE80211_SKB_CB(skb); 5490 5491 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5492 info->band = chanctx_conf->def.chan->band; 5493 5494 if (invoke_tx_handlers(&tx)) 5495 skb = NULL; 5496 out: 5497 rcu_read_unlock(); 5498 5499 return skb; 5500 } 5501 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5502 5503 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5504 { 5505 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5506 struct ieee80211_sub_if_data *sdata = sta->sdata; 5507 struct ieee80211_local *local = sdata->local; 5508 int ret; 5509 u32 queues; 5510 5511 lockdep_assert_held(&local->sta_mtx); 5512 5513 /* only some cases are supported right now */ 5514 switch (sdata->vif.type) { 5515 case NL80211_IFTYPE_STATION: 5516 case NL80211_IFTYPE_AP: 5517 case NL80211_IFTYPE_AP_VLAN: 5518 break; 5519 default: 5520 WARN_ON(1); 5521 return -EINVAL; 5522 } 5523 5524 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5525 return -EINVAL; 5526 5527 if (sta->reserved_tid == tid) { 5528 ret = 0; 5529 goto out; 5530 } 5531 5532 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5533 sdata_err(sdata, "TID reservation already active\n"); 5534 ret = -EALREADY; 5535 goto out; 5536 } 5537 5538 ieee80211_stop_vif_queues(sdata->local, sdata, 5539 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5540 5541 synchronize_net(); 5542 5543 /* Tear down BA sessions so we stop aggregating on this TID */ 5544 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5545 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5546 __ieee80211_stop_tx_ba_session(sta, tid, 5547 AGG_STOP_LOCAL_REQUEST); 5548 } 5549 5550 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5551 __ieee80211_flush_queues(local, sdata, queues, false); 5552 5553 sta->reserved_tid = tid; 5554 5555 ieee80211_wake_vif_queues(local, sdata, 5556 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5557 5558 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5559 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5560 5561 ret = 0; 5562 out: 5563 return ret; 5564 } 5565 EXPORT_SYMBOL(ieee80211_reserve_tid); 5566 5567 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5568 { 5569 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5570 struct ieee80211_sub_if_data *sdata = sta->sdata; 5571 5572 lockdep_assert_held(&sdata->local->sta_mtx); 5573 5574 /* only some cases are supported right now */ 5575 switch (sdata->vif.type) { 5576 case NL80211_IFTYPE_STATION: 5577 case NL80211_IFTYPE_AP: 5578 case NL80211_IFTYPE_AP_VLAN: 5579 break; 5580 default: 5581 WARN_ON(1); 5582 return; 5583 } 5584 5585 if (tid != sta->reserved_tid) { 5586 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5587 return; 5588 } 5589 5590 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5591 } 5592 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5593 5594 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5595 struct sk_buff *skb, int tid, 5596 enum nl80211_band band) 5597 { 5598 const struct ieee80211_hdr *hdr = (void *)skb->data; 5599 int ac = ieee80211_ac_from_tid(tid); 5600 unsigned int link; 5601 5602 skb_reset_mac_header(skb); 5603 skb_set_queue_mapping(skb, ac); 5604 skb->priority = tid; 5605 5606 skb->dev = sdata->dev; 5607 5608 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 5609 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 5610 IEEE80211_LINK_UNSPECIFIED)); 5611 5612 if (!sdata->vif.valid_links) { 5613 link = 0; 5614 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 5615 /* address from the MLD */ 5616 link = IEEE80211_LINK_UNSPECIFIED; 5617 } else { 5618 /* otherwise must be addressed from a link */ 5619 rcu_read_lock(); 5620 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 5621 struct ieee80211_bss_conf *link_conf; 5622 5623 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 5624 if (!link_conf) 5625 continue; 5626 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 5627 break; 5628 } 5629 rcu_read_unlock(); 5630 5631 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 5632 link = ffs(sdata->vif.valid_links) - 1; 5633 } 5634 5635 IEEE80211_SKB_CB(skb)->control.flags |= 5636 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 5637 5638 /* 5639 * The other path calling ieee80211_xmit is from the tasklet, 5640 * and while we can handle concurrent transmissions locking 5641 * requirements are that we do not come into tx with bhs on. 5642 */ 5643 local_bh_disable(); 5644 IEEE80211_SKB_CB(skb)->band = band; 5645 ieee80211_xmit(sdata, NULL, skb); 5646 local_bh_enable(); 5647 } 5648 5649 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 5650 struct sk_buff *skb, int tid) 5651 { 5652 struct ieee80211_chanctx_conf *chanctx_conf; 5653 enum nl80211_band band; 5654 5655 rcu_read_lock(); 5656 if (!sdata->vif.valid_links) { 5657 chanctx_conf = 5658 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5659 if (WARN_ON(!chanctx_conf)) { 5660 rcu_read_unlock(); 5661 kfree_skb(skb); 5662 return; 5663 } 5664 band = chanctx_conf->def.chan->band; 5665 } else { 5666 /* MLD transmissions must not rely on the band */ 5667 band = 0; 5668 } 5669 5670 __ieee80211_tx_skb_tid_band(sdata, skb, tid, band); 5671 rcu_read_unlock(); 5672 } 5673 5674 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5675 const u8 *buf, size_t len, 5676 const u8 *dest, __be16 proto, bool unencrypted, 5677 u64 *cookie) 5678 { 5679 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5680 struct ieee80211_local *local = sdata->local; 5681 struct sta_info *sta; 5682 struct sk_buff *skb; 5683 struct ethhdr *ehdr; 5684 u32 ctrl_flags = 0; 5685 u32 flags = 0; 5686 5687 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5688 * or Pre-Authentication 5689 */ 5690 if (proto != sdata->control_port_protocol && 5691 proto != cpu_to_be16(ETH_P_PREAUTH)) 5692 return -EINVAL; 5693 5694 if (proto == sdata->control_port_protocol) 5695 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5696 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5697 5698 if (unencrypted) 5699 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5700 5701 if (cookie) 5702 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5703 5704 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5705 5706 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5707 sizeof(struct ethhdr) + len); 5708 if (!skb) 5709 return -ENOMEM; 5710 5711 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5712 5713 skb_put_data(skb, buf, len); 5714 5715 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5716 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5717 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5718 ehdr->h_proto = proto; 5719 5720 skb->dev = dev; 5721 skb->protocol = proto; 5722 skb_reset_network_header(skb); 5723 skb_reset_mac_header(skb); 5724 5725 /* update QoS header to prioritize control port frames if possible, 5726 * priorization also happens for control port frames send over 5727 * AF_PACKET 5728 */ 5729 rcu_read_lock(); 5730 5731 if (ieee80211_lookup_ra_sta(sdata, skb, &sta) == 0 && !IS_ERR(sta)) { 5732 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5733 5734 skb_set_queue_mapping(skb, queue); 5735 skb_get_hash(skb); 5736 } 5737 5738 rcu_read_unlock(); 5739 5740 /* mutex lock is only needed for incrementing the cookie counter */ 5741 mutex_lock(&local->mtx); 5742 5743 local_bh_disable(); 5744 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5745 local_bh_enable(); 5746 5747 mutex_unlock(&local->mtx); 5748 5749 return 0; 5750 } 5751 5752 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5753 const u8 *buf, size_t len) 5754 { 5755 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5756 struct ieee80211_local *local = sdata->local; 5757 struct sk_buff *skb; 5758 5759 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5760 30 + /* header size */ 5761 18); /* 11s header size */ 5762 if (!skb) 5763 return -ENOMEM; 5764 5765 skb_reserve(skb, local->hw.extra_tx_headroom); 5766 skb_put_data(skb, buf, len); 5767 5768 skb->dev = dev; 5769 skb->protocol = htons(ETH_P_802_3); 5770 skb_reset_network_header(skb); 5771 skb_reset_mac_header(skb); 5772 5773 local_bh_disable(); 5774 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5775 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5776 NULL); 5777 local_bh_enable(); 5778 5779 return 0; 5780 } 5781