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->deflink.operating_11g_mode) 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 /* SNS11 from 802.11be 10.3.2.14 */ 826 if (unlikely(is_multicast_ether_addr(hdr->addr1) && 827 info->control.vif->valid_links && 828 info->control.vif->type == NL80211_IFTYPE_AP)) { 829 if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX) 830 tx->sdata->mld_mcast_seq += 0x10; 831 hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq); 832 return TX_CONTINUE; 833 } 834 835 /* 836 * Anything but QoS data that has a sequence number field 837 * (is long enough) gets a sequence number from the global 838 * counter. QoS data frames with a multicast destination 839 * also use the global counter (802.11-2012 9.3.2.10). 840 */ 841 if (!ieee80211_is_data_qos(hdr->frame_control) || 842 is_multicast_ether_addr(hdr->addr1)) { 843 /* driver should assign sequence number */ 844 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 845 /* for pure STA mode without beacons, we can do it */ 846 hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); 847 tx->sdata->sequence_number += 0x10; 848 if (tx->sta) 849 tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++; 850 return TX_CONTINUE; 851 } 852 853 /* 854 * This should be true for injected/management frames only, for 855 * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ 856 * above since they are not QoS-data frames. 857 */ 858 if (!tx->sta) 859 return TX_CONTINUE; 860 861 /* include per-STA, per-TID sequence counter */ 862 tid = ieee80211_get_tid(hdr); 863 tx->sta->deflink.tx_stats.msdu[tid]++; 864 865 hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid); 866 867 return TX_CONTINUE; 868 } 869 870 static int ieee80211_fragment(struct ieee80211_tx_data *tx, 871 struct sk_buff *skb, int hdrlen, 872 int frag_threshold) 873 { 874 struct ieee80211_local *local = tx->local; 875 struct ieee80211_tx_info *info; 876 struct sk_buff *tmp; 877 int per_fragm = frag_threshold - hdrlen - FCS_LEN; 878 int pos = hdrlen + per_fragm; 879 int rem = skb->len - hdrlen - per_fragm; 880 881 if (WARN_ON(rem < 0)) 882 return -EINVAL; 883 884 /* first fragment was already added to queue by caller */ 885 886 while (rem) { 887 int fraglen = per_fragm; 888 889 if (fraglen > rem) 890 fraglen = rem; 891 rem -= fraglen; 892 tmp = dev_alloc_skb(local->tx_headroom + 893 frag_threshold + 894 IEEE80211_ENCRYPT_HEADROOM + 895 IEEE80211_ENCRYPT_TAILROOM); 896 if (!tmp) 897 return -ENOMEM; 898 899 __skb_queue_tail(&tx->skbs, tmp); 900 901 skb_reserve(tmp, 902 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); 903 904 /* copy control information */ 905 memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); 906 907 info = IEEE80211_SKB_CB(tmp); 908 info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | 909 IEEE80211_TX_CTL_FIRST_FRAGMENT); 910 911 if (rem) 912 info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; 913 914 skb_copy_queue_mapping(tmp, skb); 915 tmp->priority = skb->priority; 916 tmp->dev = skb->dev; 917 918 /* copy header and data */ 919 skb_put_data(tmp, skb->data, hdrlen); 920 skb_put_data(tmp, skb->data + pos, fraglen); 921 922 pos += fraglen; 923 } 924 925 /* adjust first fragment's length */ 926 skb_trim(skb, hdrlen + per_fragm); 927 return 0; 928 } 929 930 static ieee80211_tx_result debug_noinline 931 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) 932 { 933 struct sk_buff *skb = tx->skb; 934 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 935 struct ieee80211_hdr *hdr = (void *)skb->data; 936 int frag_threshold = tx->local->hw.wiphy->frag_threshold; 937 int hdrlen; 938 int fragnum; 939 940 /* no matter what happens, tx->skb moves to tx->skbs */ 941 __skb_queue_tail(&tx->skbs, skb); 942 tx->skb = NULL; 943 944 if (info->flags & IEEE80211_TX_CTL_DONTFRAG) 945 return TX_CONTINUE; 946 947 if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) 948 return TX_CONTINUE; 949 950 /* 951 * Warn when submitting a fragmented A-MPDU frame and drop it. 952 * This scenario is handled in ieee80211_tx_prepare but extra 953 * caution taken here as fragmented ampdu may cause Tx stop. 954 */ 955 if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) 956 return TX_DROP; 957 958 hdrlen = ieee80211_hdrlen(hdr->frame_control); 959 960 /* internal error, why isn't DONTFRAG set? */ 961 if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) 962 return TX_DROP; 963 964 /* 965 * Now fragment the frame. This will allocate all the fragments and 966 * chain them (using skb as the first fragment) to skb->next. 967 * During transmission, we will remove the successfully transmitted 968 * fragments from this list. When the low-level driver rejects one 969 * of the fragments then we will simply pretend to accept the skb 970 * but store it away as pending. 971 */ 972 if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) 973 return TX_DROP; 974 975 /* update duration/seq/flags of fragments */ 976 fragnum = 0; 977 978 skb_queue_walk(&tx->skbs, skb) { 979 const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); 980 981 hdr = (void *)skb->data; 982 info = IEEE80211_SKB_CB(skb); 983 984 if (!skb_queue_is_last(&tx->skbs, skb)) { 985 hdr->frame_control |= morefrags; 986 /* 987 * No multi-rate retries for fragmented frames, that 988 * would completely throw off the NAV at other STAs. 989 */ 990 info->control.rates[1].idx = -1; 991 info->control.rates[2].idx = -1; 992 info->control.rates[3].idx = -1; 993 BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); 994 info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; 995 } else { 996 hdr->frame_control &= ~morefrags; 997 } 998 hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); 999 fragnum++; 1000 } 1001 1002 return TX_CONTINUE; 1003 } 1004 1005 static ieee80211_tx_result debug_noinline 1006 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) 1007 { 1008 struct sk_buff *skb; 1009 int ac = -1; 1010 1011 if (!tx->sta) 1012 return TX_CONTINUE; 1013 1014 skb_queue_walk(&tx->skbs, skb) { 1015 ac = skb_get_queue_mapping(skb); 1016 tx->sta->deflink.tx_stats.bytes[ac] += skb->len; 1017 } 1018 if (ac >= 0) 1019 tx->sta->deflink.tx_stats.packets[ac]++; 1020 1021 return TX_CONTINUE; 1022 } 1023 1024 static ieee80211_tx_result debug_noinline 1025 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) 1026 { 1027 if (!tx->key) 1028 return TX_CONTINUE; 1029 1030 switch (tx->key->conf.cipher) { 1031 case WLAN_CIPHER_SUITE_WEP40: 1032 case WLAN_CIPHER_SUITE_WEP104: 1033 return ieee80211_crypto_wep_encrypt(tx); 1034 case WLAN_CIPHER_SUITE_TKIP: 1035 return ieee80211_crypto_tkip_encrypt(tx); 1036 case WLAN_CIPHER_SUITE_CCMP: 1037 return ieee80211_crypto_ccmp_encrypt( 1038 tx, IEEE80211_CCMP_MIC_LEN); 1039 case WLAN_CIPHER_SUITE_CCMP_256: 1040 return ieee80211_crypto_ccmp_encrypt( 1041 tx, IEEE80211_CCMP_256_MIC_LEN); 1042 case WLAN_CIPHER_SUITE_AES_CMAC: 1043 return ieee80211_crypto_aes_cmac_encrypt(tx); 1044 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 1045 return ieee80211_crypto_aes_cmac_256_encrypt(tx); 1046 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 1047 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 1048 return ieee80211_crypto_aes_gmac_encrypt(tx); 1049 case WLAN_CIPHER_SUITE_GCMP: 1050 case WLAN_CIPHER_SUITE_GCMP_256: 1051 return ieee80211_crypto_gcmp_encrypt(tx); 1052 } 1053 1054 return TX_DROP; 1055 } 1056 1057 static ieee80211_tx_result debug_noinline 1058 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) 1059 { 1060 struct sk_buff *skb; 1061 struct ieee80211_hdr *hdr; 1062 int next_len; 1063 bool group_addr; 1064 1065 skb_queue_walk(&tx->skbs, skb) { 1066 hdr = (void *) skb->data; 1067 if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) 1068 break; /* must not overwrite AID */ 1069 if (!skb_queue_is_last(&tx->skbs, skb)) { 1070 struct sk_buff *next = skb_queue_next(&tx->skbs, skb); 1071 next_len = next->len; 1072 } else 1073 next_len = 0; 1074 group_addr = is_multicast_ether_addr(hdr->addr1); 1075 1076 hdr->duration_id = 1077 ieee80211_duration(tx, skb, group_addr, next_len); 1078 } 1079 1080 return TX_CONTINUE; 1081 } 1082 1083 /* actual transmit path */ 1084 1085 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, 1086 struct sk_buff *skb, 1087 struct ieee80211_tx_info *info, 1088 struct tid_ampdu_tx *tid_tx, 1089 int tid) 1090 { 1091 bool queued = false; 1092 bool reset_agg_timer = false; 1093 struct sk_buff *purge_skb = NULL; 1094 1095 if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1096 info->flags |= IEEE80211_TX_CTL_AMPDU; 1097 reset_agg_timer = true; 1098 } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { 1099 /* 1100 * nothing -- this aggregation session is being started 1101 * but that might still fail with the driver 1102 */ 1103 } else if (!tx->sta->sta.txq[tid]) { 1104 spin_lock(&tx->sta->lock); 1105 /* 1106 * Need to re-check now, because we may get here 1107 * 1108 * 1) in the window during which the setup is actually 1109 * already done, but not marked yet because not all 1110 * packets are spliced over to the driver pending 1111 * queue yet -- if this happened we acquire the lock 1112 * either before or after the splice happens, but 1113 * need to recheck which of these cases happened. 1114 * 1115 * 2) during session teardown, if the OPERATIONAL bit 1116 * was cleared due to the teardown but the pointer 1117 * hasn't been assigned NULL yet (or we loaded it 1118 * before it was assigned) -- in this case it may 1119 * now be NULL which means we should just let the 1120 * packet pass through because splicing the frames 1121 * back is already done. 1122 */ 1123 tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); 1124 1125 if (!tid_tx) { 1126 /* do nothing, let packet pass through */ 1127 } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 1128 info->flags |= IEEE80211_TX_CTL_AMPDU; 1129 reset_agg_timer = true; 1130 } else { 1131 queued = true; 1132 if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) { 1133 clear_sta_flag(tx->sta, WLAN_STA_SP); 1134 ps_dbg(tx->sta->sdata, 1135 "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n", 1136 tx->sta->sta.addr, tx->sta->sta.aid); 1137 } 1138 info->control.vif = &tx->sdata->vif; 1139 info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1140 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; 1141 __skb_queue_tail(&tid_tx->pending, skb); 1142 if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) 1143 purge_skb = __skb_dequeue(&tid_tx->pending); 1144 } 1145 spin_unlock(&tx->sta->lock); 1146 1147 if (purge_skb) 1148 ieee80211_free_txskb(&tx->local->hw, purge_skb); 1149 } 1150 1151 /* reset session timer */ 1152 if (reset_agg_timer) 1153 tid_tx->last_tx = jiffies; 1154 1155 return queued; 1156 } 1157 1158 static void 1159 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata, 1160 struct sta_info *sta, 1161 struct sk_buff *skb) 1162 { 1163 struct rate_control_ref *ref = sdata->local->rate_ctrl; 1164 u16 tid; 1165 1166 if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER)) 1167 return; 1168 1169 if (!sta || !sta->sta.deflink.ht_cap.ht_supported || 1170 !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO || 1171 skb->protocol == sdata->control_port_protocol) 1172 return; 1173 1174 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1175 if (likely(sta->ampdu_mlme.tid_tx[tid])) 1176 return; 1177 1178 ieee80211_start_tx_ba_session(&sta->sta, tid, 0); 1179 } 1180 1181 /* 1182 * initialises @tx 1183 * pass %NULL for the station if unknown, a valid pointer if known 1184 * or an ERR_PTR() if the station is known not to exist 1185 */ 1186 static ieee80211_tx_result 1187 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, 1188 struct ieee80211_tx_data *tx, 1189 struct sta_info *sta, struct sk_buff *skb) 1190 { 1191 struct ieee80211_local *local = sdata->local; 1192 struct ieee80211_hdr *hdr; 1193 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1194 bool aggr_check = false; 1195 int tid; 1196 1197 memset(tx, 0, sizeof(*tx)); 1198 tx->skb = skb; 1199 tx->local = local; 1200 tx->sdata = sdata; 1201 __skb_queue_head_init(&tx->skbs); 1202 1203 /* 1204 * If this flag is set to true anywhere, and we get here, 1205 * we are doing the needed processing, so remove the flag 1206 * now. 1207 */ 1208 info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1209 1210 hdr = (struct ieee80211_hdr *) skb->data; 1211 1212 if (likely(sta)) { 1213 if (!IS_ERR(sta)) 1214 tx->sta = sta; 1215 } else { 1216 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 1217 tx->sta = rcu_dereference(sdata->u.vlan.sta); 1218 if (!tx->sta && sdata->wdev.use_4addr) 1219 return TX_DROP; 1220 } else if (tx->sdata->control_port_protocol == tx->skb->protocol) { 1221 tx->sta = sta_info_get_bss(sdata, hdr->addr1); 1222 } 1223 if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) { 1224 tx->sta = sta_info_get(sdata, hdr->addr1); 1225 aggr_check = true; 1226 } 1227 } 1228 1229 if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && 1230 !ieee80211_is_qos_nullfunc(hdr->frame_control) && 1231 ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && 1232 !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) { 1233 struct tid_ampdu_tx *tid_tx; 1234 1235 tid = ieee80211_get_tid(hdr); 1236 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1237 if (!tid_tx && aggr_check) { 1238 ieee80211_aggr_check(sdata, tx->sta, skb); 1239 tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); 1240 } 1241 1242 if (tid_tx) { 1243 bool queued; 1244 1245 queued = ieee80211_tx_prep_agg(tx, skb, info, 1246 tid_tx, tid); 1247 1248 if (unlikely(queued)) 1249 return TX_QUEUED; 1250 } 1251 } 1252 1253 if (is_multicast_ether_addr(hdr->addr1)) { 1254 tx->flags &= ~IEEE80211_TX_UNICAST; 1255 info->flags |= IEEE80211_TX_CTL_NO_ACK; 1256 } else 1257 tx->flags |= IEEE80211_TX_UNICAST; 1258 1259 if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { 1260 if (!(tx->flags & IEEE80211_TX_UNICAST) || 1261 skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || 1262 info->flags & IEEE80211_TX_CTL_AMPDU) 1263 info->flags |= IEEE80211_TX_CTL_DONTFRAG; 1264 } 1265 1266 if (!tx->sta) 1267 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1268 else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) { 1269 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; 1270 ieee80211_check_fast_xmit(tx->sta); 1271 } 1272 1273 info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; 1274 1275 return TX_CONTINUE; 1276 } 1277 1278 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local, 1279 struct ieee80211_vif *vif, 1280 struct sta_info *sta, 1281 struct sk_buff *skb) 1282 { 1283 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1285 struct ieee80211_txq *txq = NULL; 1286 1287 if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) || 1288 (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE)) 1289 return NULL; 1290 1291 if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) && 1292 unlikely(!ieee80211_is_data_present(hdr->frame_control))) { 1293 if ((!ieee80211_is_mgmt(hdr->frame_control) || 1294 ieee80211_is_bufferable_mmpdu(hdr->frame_control) || 1295 vif->type == NL80211_IFTYPE_STATION) && 1296 sta && sta->uploaded) { 1297 /* 1298 * This will be NULL if the driver didn't set the 1299 * opt-in hardware flag. 1300 */ 1301 txq = sta->sta.txq[IEEE80211_NUM_TIDS]; 1302 } 1303 } else if (sta) { 1304 u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK; 1305 1306 if (!sta->uploaded) 1307 return NULL; 1308 1309 txq = sta->sta.txq[tid]; 1310 } else if (vif) { 1311 txq = vif->txq; 1312 } 1313 1314 if (!txq) 1315 return NULL; 1316 1317 return to_txq_info(txq); 1318 } 1319 1320 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb) 1321 { 1322 IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time(); 1323 } 1324 1325 static u32 codel_skb_len_func(const struct sk_buff *skb) 1326 { 1327 return skb->len; 1328 } 1329 1330 static codel_time_t codel_skb_time_func(const struct sk_buff *skb) 1331 { 1332 const struct ieee80211_tx_info *info; 1333 1334 info = (const struct ieee80211_tx_info *)skb->cb; 1335 return info->control.enqueue_time; 1336 } 1337 1338 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars, 1339 void *ctx) 1340 { 1341 struct ieee80211_local *local; 1342 struct txq_info *txqi; 1343 struct fq *fq; 1344 struct fq_flow *flow; 1345 1346 txqi = ctx; 1347 local = vif_to_sdata(txqi->txq.vif)->local; 1348 fq = &local->fq; 1349 1350 if (cvars == &txqi->def_cvars) 1351 flow = &txqi->tin.default_flow; 1352 else 1353 flow = &fq->flows[cvars - local->cvars]; 1354 1355 return fq_flow_dequeue(fq, flow); 1356 } 1357 1358 static void codel_drop_func(struct sk_buff *skb, 1359 void *ctx) 1360 { 1361 struct ieee80211_local *local; 1362 struct ieee80211_hw *hw; 1363 struct txq_info *txqi; 1364 1365 txqi = ctx; 1366 local = vif_to_sdata(txqi->txq.vif)->local; 1367 hw = &local->hw; 1368 1369 ieee80211_free_txskb(hw, skb); 1370 } 1371 1372 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq, 1373 struct fq_tin *tin, 1374 struct fq_flow *flow) 1375 { 1376 struct ieee80211_local *local; 1377 struct txq_info *txqi; 1378 struct codel_vars *cvars; 1379 struct codel_params *cparams; 1380 struct codel_stats *cstats; 1381 1382 local = container_of(fq, struct ieee80211_local, fq); 1383 txqi = container_of(tin, struct txq_info, tin); 1384 cstats = &txqi->cstats; 1385 1386 if (txqi->txq.sta) { 1387 struct sta_info *sta = container_of(txqi->txq.sta, 1388 struct sta_info, sta); 1389 cparams = &sta->cparams; 1390 } else { 1391 cparams = &local->cparams; 1392 } 1393 1394 if (flow == &tin->default_flow) 1395 cvars = &txqi->def_cvars; 1396 else 1397 cvars = &local->cvars[flow - fq->flows]; 1398 1399 return codel_dequeue(txqi, 1400 &flow->backlog, 1401 cparams, 1402 cvars, 1403 cstats, 1404 codel_skb_len_func, 1405 codel_skb_time_func, 1406 codel_drop_func, 1407 codel_dequeue_func); 1408 } 1409 1410 static void fq_skb_free_func(struct fq *fq, 1411 struct fq_tin *tin, 1412 struct fq_flow *flow, 1413 struct sk_buff *skb) 1414 { 1415 struct ieee80211_local *local; 1416 1417 local = container_of(fq, struct ieee80211_local, fq); 1418 ieee80211_free_txskb(&local->hw, skb); 1419 } 1420 1421 static void ieee80211_txq_enqueue(struct ieee80211_local *local, 1422 struct txq_info *txqi, 1423 struct sk_buff *skb) 1424 { 1425 struct fq *fq = &local->fq; 1426 struct fq_tin *tin = &txqi->tin; 1427 u32 flow_idx = fq_flow_idx(fq, skb); 1428 1429 ieee80211_set_skb_enqueue_time(skb); 1430 1431 spin_lock_bh(&fq->lock); 1432 /* 1433 * For management frames, don't really apply codel etc., 1434 * we don't want to apply any shaping or anything we just 1435 * want to simplify the driver API by having them on the 1436 * txqi. 1437 */ 1438 if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) { 1439 IEEE80211_SKB_CB(skb)->control.flags |= 1440 IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 1441 __skb_queue_tail(&txqi->frags, skb); 1442 } else { 1443 fq_tin_enqueue(fq, tin, flow_idx, skb, 1444 fq_skb_free_func); 1445 } 1446 spin_unlock_bh(&fq->lock); 1447 } 1448 1449 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin, 1450 struct fq_flow *flow, struct sk_buff *skb, 1451 void *data) 1452 { 1453 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1454 1455 return info->control.vif == data; 1456 } 1457 1458 void ieee80211_txq_remove_vlan(struct ieee80211_local *local, 1459 struct ieee80211_sub_if_data *sdata) 1460 { 1461 struct fq *fq = &local->fq; 1462 struct txq_info *txqi; 1463 struct fq_tin *tin; 1464 struct ieee80211_sub_if_data *ap; 1465 1466 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) 1467 return; 1468 1469 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); 1470 1471 if (!ap->vif.txq) 1472 return; 1473 1474 txqi = to_txq_info(ap->vif.txq); 1475 tin = &txqi->tin; 1476 1477 spin_lock_bh(&fq->lock); 1478 fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif, 1479 fq_skb_free_func); 1480 spin_unlock_bh(&fq->lock); 1481 } 1482 1483 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata, 1484 struct sta_info *sta, 1485 struct txq_info *txqi, int tid) 1486 { 1487 fq_tin_init(&txqi->tin); 1488 codel_vars_init(&txqi->def_cvars); 1489 codel_stats_init(&txqi->cstats); 1490 __skb_queue_head_init(&txqi->frags); 1491 INIT_LIST_HEAD(&txqi->schedule_order); 1492 1493 txqi->txq.vif = &sdata->vif; 1494 1495 if (!sta) { 1496 sdata->vif.txq = &txqi->txq; 1497 txqi->txq.tid = 0; 1498 txqi->txq.ac = IEEE80211_AC_BE; 1499 1500 return; 1501 } 1502 1503 if (tid == IEEE80211_NUM_TIDS) { 1504 if (sdata->vif.type == NL80211_IFTYPE_STATION) { 1505 /* Drivers need to opt in to the management MPDU TXQ */ 1506 if (!ieee80211_hw_check(&sdata->local->hw, 1507 STA_MMPDU_TXQ)) 1508 return; 1509 } else if (!ieee80211_hw_check(&sdata->local->hw, 1510 BUFF_MMPDU_TXQ)) { 1511 /* Drivers need to opt in to the bufferable MMPDU TXQ */ 1512 return; 1513 } 1514 txqi->txq.ac = IEEE80211_AC_VO; 1515 } else { 1516 txqi->txq.ac = ieee80211_ac_from_tid(tid); 1517 } 1518 1519 txqi->txq.sta = &sta->sta; 1520 txqi->txq.tid = tid; 1521 sta->sta.txq[tid] = &txqi->txq; 1522 } 1523 1524 void ieee80211_txq_purge(struct ieee80211_local *local, 1525 struct txq_info *txqi) 1526 { 1527 struct fq *fq = &local->fq; 1528 struct fq_tin *tin = &txqi->tin; 1529 1530 spin_lock_bh(&fq->lock); 1531 fq_tin_reset(fq, tin, fq_skb_free_func); 1532 ieee80211_purge_tx_queue(&local->hw, &txqi->frags); 1533 spin_unlock_bh(&fq->lock); 1534 1535 spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); 1536 list_del_init(&txqi->schedule_order); 1537 spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); 1538 } 1539 1540 void ieee80211_txq_set_params(struct ieee80211_local *local) 1541 { 1542 if (local->hw.wiphy->txq_limit) 1543 local->fq.limit = local->hw.wiphy->txq_limit; 1544 else 1545 local->hw.wiphy->txq_limit = local->fq.limit; 1546 1547 if (local->hw.wiphy->txq_memory_limit) 1548 local->fq.memory_limit = local->hw.wiphy->txq_memory_limit; 1549 else 1550 local->hw.wiphy->txq_memory_limit = local->fq.memory_limit; 1551 1552 if (local->hw.wiphy->txq_quantum) 1553 local->fq.quantum = local->hw.wiphy->txq_quantum; 1554 else 1555 local->hw.wiphy->txq_quantum = local->fq.quantum; 1556 } 1557 1558 int ieee80211_txq_setup_flows(struct ieee80211_local *local) 1559 { 1560 struct fq *fq = &local->fq; 1561 int ret; 1562 int i; 1563 bool supp_vht = false; 1564 enum nl80211_band band; 1565 1566 if (!local->ops->wake_tx_queue) 1567 return 0; 1568 1569 ret = fq_init(fq, 4096); 1570 if (ret) 1571 return ret; 1572 1573 /* 1574 * If the hardware doesn't support VHT, it is safe to limit the maximum 1575 * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n. 1576 */ 1577 for (band = 0; band < NUM_NL80211_BANDS; band++) { 1578 struct ieee80211_supported_band *sband; 1579 1580 sband = local->hw.wiphy->bands[band]; 1581 if (!sband) 1582 continue; 1583 1584 supp_vht = supp_vht || sband->vht_cap.vht_supported; 1585 } 1586 1587 if (!supp_vht) 1588 fq->memory_limit = 4 << 20; /* 4 Mbytes */ 1589 1590 codel_params_init(&local->cparams); 1591 local->cparams.interval = MS2TIME(100); 1592 local->cparams.target = MS2TIME(20); 1593 local->cparams.ecn = true; 1594 1595 local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]), 1596 GFP_KERNEL); 1597 if (!local->cvars) { 1598 spin_lock_bh(&fq->lock); 1599 fq_reset(fq, fq_skb_free_func); 1600 spin_unlock_bh(&fq->lock); 1601 return -ENOMEM; 1602 } 1603 1604 for (i = 0; i < fq->flows_cnt; i++) 1605 codel_vars_init(&local->cvars[i]); 1606 1607 ieee80211_txq_set_params(local); 1608 1609 return 0; 1610 } 1611 1612 void ieee80211_txq_teardown_flows(struct ieee80211_local *local) 1613 { 1614 struct fq *fq = &local->fq; 1615 1616 if (!local->ops->wake_tx_queue) 1617 return; 1618 1619 kfree(local->cvars); 1620 local->cvars = NULL; 1621 1622 spin_lock_bh(&fq->lock); 1623 fq_reset(fq, fq_skb_free_func); 1624 spin_unlock_bh(&fq->lock); 1625 } 1626 1627 static bool ieee80211_queue_skb(struct ieee80211_local *local, 1628 struct ieee80211_sub_if_data *sdata, 1629 struct sta_info *sta, 1630 struct sk_buff *skb) 1631 { 1632 struct ieee80211_vif *vif; 1633 struct txq_info *txqi; 1634 1635 if (!local->ops->wake_tx_queue || 1636 sdata->vif.type == NL80211_IFTYPE_MONITOR) 1637 return false; 1638 1639 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 1640 sdata = container_of(sdata->bss, 1641 struct ieee80211_sub_if_data, u.ap); 1642 1643 vif = &sdata->vif; 1644 txqi = ieee80211_get_txq(local, vif, sta, skb); 1645 1646 if (!txqi) 1647 return false; 1648 1649 ieee80211_txq_enqueue(local, txqi, skb); 1650 1651 schedule_and_wake_txq(local, txqi); 1652 1653 return true; 1654 } 1655 1656 static bool ieee80211_tx_frags(struct ieee80211_local *local, 1657 struct ieee80211_vif *vif, 1658 struct sta_info *sta, 1659 struct sk_buff_head *skbs, 1660 bool txpending) 1661 { 1662 struct ieee80211_tx_control control = {}; 1663 struct sk_buff *skb, *tmp; 1664 unsigned long flags; 1665 1666 skb_queue_walk_safe(skbs, skb, tmp) { 1667 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1668 int q = info->hw_queue; 1669 1670 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 1671 if (WARN_ON_ONCE(q >= local->hw.queues)) { 1672 __skb_unlink(skb, skbs); 1673 ieee80211_free_txskb(&local->hw, skb); 1674 continue; 1675 } 1676 #endif 1677 1678 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 1679 if (local->queue_stop_reasons[q] || 1680 (!txpending && !skb_queue_empty(&local->pending[q]))) { 1681 if (unlikely(info->flags & 1682 IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { 1683 if (local->queue_stop_reasons[q] & 1684 ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { 1685 /* 1686 * Drop off-channel frames if queues 1687 * are stopped for any reason other 1688 * than off-channel operation. Never 1689 * queue them. 1690 */ 1691 spin_unlock_irqrestore( 1692 &local->queue_stop_reason_lock, 1693 flags); 1694 ieee80211_purge_tx_queue(&local->hw, 1695 skbs); 1696 return true; 1697 } 1698 } else { 1699 1700 /* 1701 * Since queue is stopped, queue up frames for 1702 * later transmission from the tx-pending 1703 * tasklet when the queue is woken again. 1704 */ 1705 if (txpending) 1706 skb_queue_splice_init(skbs, 1707 &local->pending[q]); 1708 else 1709 skb_queue_splice_tail_init(skbs, 1710 &local->pending[q]); 1711 1712 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 1713 flags); 1714 return false; 1715 } 1716 } 1717 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 1718 1719 info->control.vif = vif; 1720 control.sta = sta ? &sta->sta : NULL; 1721 1722 __skb_unlink(skb, skbs); 1723 drv_tx(local, &control, skb); 1724 } 1725 1726 return true; 1727 } 1728 1729 /* 1730 * Returns false if the frame couldn't be transmitted but was queued instead. 1731 */ 1732 static bool __ieee80211_tx(struct ieee80211_local *local, 1733 struct sk_buff_head *skbs, struct sta_info *sta, 1734 bool txpending) 1735 { 1736 struct ieee80211_tx_info *info; 1737 struct ieee80211_sub_if_data *sdata; 1738 struct ieee80211_vif *vif; 1739 struct sk_buff *skb; 1740 bool result; 1741 1742 if (WARN_ON(skb_queue_empty(skbs))) 1743 return true; 1744 1745 skb = skb_peek(skbs); 1746 info = IEEE80211_SKB_CB(skb); 1747 sdata = vif_to_sdata(info->control.vif); 1748 if (sta && !sta->uploaded) 1749 sta = NULL; 1750 1751 switch (sdata->vif.type) { 1752 case NL80211_IFTYPE_MONITOR: 1753 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 1754 vif = &sdata->vif; 1755 break; 1756 } 1757 sdata = rcu_dereference(local->monitor_sdata); 1758 if (sdata) { 1759 vif = &sdata->vif; 1760 info->hw_queue = 1761 vif->hw_queue[skb_get_queue_mapping(skb)]; 1762 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 1763 ieee80211_purge_tx_queue(&local->hw, skbs); 1764 return true; 1765 } else 1766 vif = NULL; 1767 break; 1768 case NL80211_IFTYPE_AP_VLAN: 1769 sdata = container_of(sdata->bss, 1770 struct ieee80211_sub_if_data, u.ap); 1771 fallthrough; 1772 default: 1773 vif = &sdata->vif; 1774 break; 1775 } 1776 1777 result = ieee80211_tx_frags(local, vif, sta, skbs, txpending); 1778 1779 WARN_ON_ONCE(!skb_queue_empty(skbs)); 1780 1781 return result; 1782 } 1783 1784 /* 1785 * Invoke TX handlers, return 0 on success and non-zero if the 1786 * frame was dropped or queued. 1787 * 1788 * The handlers are split into an early and late part. The latter is everything 1789 * that can be sensitive to reordering, and will be deferred to after packets 1790 * are dequeued from the intermediate queues (when they are enabled). 1791 */ 1792 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx) 1793 { 1794 ieee80211_tx_result res = TX_DROP; 1795 1796 #define CALL_TXH(txh) \ 1797 do { \ 1798 res = txh(tx); \ 1799 if (res != TX_CONTINUE) \ 1800 goto txh_done; \ 1801 } while (0) 1802 1803 CALL_TXH(ieee80211_tx_h_dynamic_ps); 1804 CALL_TXH(ieee80211_tx_h_check_assoc); 1805 CALL_TXH(ieee80211_tx_h_ps_buf); 1806 CALL_TXH(ieee80211_tx_h_check_control_port_protocol); 1807 CALL_TXH(ieee80211_tx_h_select_key); 1808 1809 txh_done: 1810 if (unlikely(res == TX_DROP)) { 1811 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1812 if (tx->skb) 1813 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1814 else 1815 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1816 return -1; 1817 } else if (unlikely(res == TX_QUEUED)) { 1818 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1819 return -1; 1820 } 1821 1822 return 0; 1823 } 1824 1825 /* 1826 * Late handlers can be called while the sta lock is held. Handlers that can 1827 * cause packets to be generated will cause deadlock! 1828 */ 1829 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx) 1830 { 1831 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); 1832 ieee80211_tx_result res = TX_CONTINUE; 1833 1834 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1835 CALL_TXH(ieee80211_tx_h_rate_ctrl); 1836 1837 if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { 1838 __skb_queue_tail(&tx->skbs, tx->skb); 1839 tx->skb = NULL; 1840 goto txh_done; 1841 } 1842 1843 CALL_TXH(ieee80211_tx_h_michael_mic_add); 1844 CALL_TXH(ieee80211_tx_h_sequence); 1845 CALL_TXH(ieee80211_tx_h_fragment); 1846 /* handlers after fragment must be aware of tx info fragmentation! */ 1847 CALL_TXH(ieee80211_tx_h_stats); 1848 CALL_TXH(ieee80211_tx_h_encrypt); 1849 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL)) 1850 CALL_TXH(ieee80211_tx_h_calculate_duration); 1851 #undef CALL_TXH 1852 1853 txh_done: 1854 if (unlikely(res == TX_DROP)) { 1855 I802_DEBUG_INC(tx->local->tx_handlers_drop); 1856 if (tx->skb) 1857 ieee80211_free_txskb(&tx->local->hw, tx->skb); 1858 else 1859 ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); 1860 return -1; 1861 } else if (unlikely(res == TX_QUEUED)) { 1862 I802_DEBUG_INC(tx->local->tx_handlers_queued); 1863 return -1; 1864 } 1865 1866 return 0; 1867 } 1868 1869 static int invoke_tx_handlers(struct ieee80211_tx_data *tx) 1870 { 1871 int r = invoke_tx_handlers_early(tx); 1872 1873 if (r) 1874 return r; 1875 return invoke_tx_handlers_late(tx); 1876 } 1877 1878 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, 1879 struct ieee80211_vif *vif, struct sk_buff *skb, 1880 int band, struct ieee80211_sta **sta) 1881 { 1882 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 1883 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1884 struct ieee80211_tx_data tx; 1885 struct sk_buff *skb2; 1886 1887 if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP) 1888 return false; 1889 1890 info->band = band; 1891 info->control.vif = vif; 1892 info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; 1893 1894 if (invoke_tx_handlers(&tx)) 1895 return false; 1896 1897 if (sta) { 1898 if (tx.sta) 1899 *sta = &tx.sta->sta; 1900 else 1901 *sta = NULL; 1902 } 1903 1904 /* this function isn't suitable for fragmented data frames */ 1905 skb2 = __skb_dequeue(&tx.skbs); 1906 if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) { 1907 ieee80211_free_txskb(hw, skb2); 1908 ieee80211_purge_tx_queue(hw, &tx.skbs); 1909 return false; 1910 } 1911 1912 return true; 1913 } 1914 EXPORT_SYMBOL(ieee80211_tx_prepare_skb); 1915 1916 /* 1917 * Returns false if the frame couldn't be transmitted but was queued instead. 1918 */ 1919 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, 1920 struct sta_info *sta, struct sk_buff *skb, 1921 bool txpending) 1922 { 1923 struct ieee80211_local *local = sdata->local; 1924 struct ieee80211_tx_data tx; 1925 ieee80211_tx_result res_prepare; 1926 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 1927 bool result = true; 1928 1929 if (unlikely(skb->len < 10)) { 1930 dev_kfree_skb(skb); 1931 return true; 1932 } 1933 1934 /* initialises tx */ 1935 res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb); 1936 1937 if (unlikely(res_prepare == TX_DROP)) { 1938 ieee80211_free_txskb(&local->hw, skb); 1939 return true; 1940 } else if (unlikely(res_prepare == TX_QUEUED)) { 1941 return true; 1942 } 1943 1944 /* set up hw_queue value early */ 1945 if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || 1946 !ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) 1947 info->hw_queue = 1948 sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 1949 1950 if (invoke_tx_handlers_early(&tx)) 1951 return true; 1952 1953 if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb)) 1954 return true; 1955 1956 if (!invoke_tx_handlers_late(&tx)) 1957 result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending); 1958 1959 return result; 1960 } 1961 1962 /* device xmit handlers */ 1963 1964 enum ieee80211_encrypt { 1965 ENCRYPT_NO, 1966 ENCRYPT_MGMT, 1967 ENCRYPT_DATA, 1968 }; 1969 1970 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, 1971 struct sk_buff *skb, 1972 int head_need, 1973 enum ieee80211_encrypt encrypt) 1974 { 1975 struct ieee80211_local *local = sdata->local; 1976 bool enc_tailroom; 1977 int tail_need = 0; 1978 1979 enc_tailroom = encrypt == ENCRYPT_MGMT || 1980 (encrypt == ENCRYPT_DATA && 1981 sdata->crypto_tx_tailroom_needed_cnt); 1982 1983 if (enc_tailroom) { 1984 tail_need = IEEE80211_ENCRYPT_TAILROOM; 1985 tail_need -= skb_tailroom(skb); 1986 tail_need = max_t(int, tail_need, 0); 1987 } 1988 1989 if (skb_cloned(skb) && 1990 (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) || 1991 !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom)) 1992 I802_DEBUG_INC(local->tx_expand_skb_head_cloned); 1993 else if (head_need || tail_need) 1994 I802_DEBUG_INC(local->tx_expand_skb_head); 1995 else 1996 return 0; 1997 1998 if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { 1999 wiphy_debug(local->hw.wiphy, 2000 "failed to reallocate TX buffer\n"); 2001 return -ENOMEM; 2002 } 2003 2004 return 0; 2005 } 2006 2007 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, 2008 struct sta_info *sta, struct sk_buff *skb) 2009 { 2010 struct ieee80211_local *local = sdata->local; 2011 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2012 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 2013 int headroom; 2014 enum ieee80211_encrypt encrypt; 2015 2016 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT) 2017 encrypt = ENCRYPT_NO; 2018 else if (ieee80211_is_mgmt(hdr->frame_control)) 2019 encrypt = ENCRYPT_MGMT; 2020 else 2021 encrypt = ENCRYPT_DATA; 2022 2023 headroom = local->tx_headroom; 2024 if (encrypt != ENCRYPT_NO) 2025 headroom += IEEE80211_ENCRYPT_HEADROOM; 2026 headroom -= skb_headroom(skb); 2027 headroom = max_t(int, 0, headroom); 2028 2029 if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) { 2030 ieee80211_free_txskb(&local->hw, skb); 2031 return; 2032 } 2033 2034 /* reload after potential resize */ 2035 hdr = (struct ieee80211_hdr *) skb->data; 2036 info->control.vif = &sdata->vif; 2037 2038 if (ieee80211_vif_is_mesh(&sdata->vif)) { 2039 if (ieee80211_is_data(hdr->frame_control) && 2040 is_unicast_ether_addr(hdr->addr1)) { 2041 if (mesh_nexthop_resolve(sdata, skb)) 2042 return; /* skb queued: don't free */ 2043 } else { 2044 ieee80211_mps_set_frame_flags(sdata, NULL, hdr); 2045 } 2046 } 2047 2048 ieee80211_set_qos_hdr(sdata, skb); 2049 ieee80211_tx(sdata, sta, skb, false); 2050 } 2051 2052 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb) 2053 { 2054 struct ieee80211_radiotap_header *rthdr = 2055 (struct ieee80211_radiotap_header *)skb->data; 2056 2057 /* check for not even having the fixed radiotap header part */ 2058 if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) 2059 return false; /* too short to be possibly valid */ 2060 2061 /* is it a header version we can trust to find length from? */ 2062 if (unlikely(rthdr->it_version)) 2063 return false; /* only version 0 is supported */ 2064 2065 /* does the skb contain enough to deliver on the alleged length? */ 2066 if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data))) 2067 return false; /* skb too short for claimed rt header extent */ 2068 2069 return true; 2070 } 2071 2072 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb, 2073 struct net_device *dev) 2074 { 2075 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2076 struct ieee80211_radiotap_iterator iterator; 2077 struct ieee80211_radiotap_header *rthdr = 2078 (struct ieee80211_radiotap_header *) skb->data; 2079 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2080 int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, 2081 NULL); 2082 u16 txflags; 2083 u16 rate = 0; 2084 bool rate_found = false; 2085 u8 rate_retries = 0; 2086 u16 rate_flags = 0; 2087 u8 mcs_known, mcs_flags, mcs_bw; 2088 u16 vht_known; 2089 u8 vht_mcs = 0, vht_nss = 0; 2090 int i; 2091 2092 if (!ieee80211_validate_radiotap_len(skb)) 2093 return false; 2094 2095 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | 2096 IEEE80211_TX_CTL_DONTFRAG; 2097 2098 /* 2099 * for every radiotap entry that is present 2100 * (ieee80211_radiotap_iterator_next returns -ENOENT when no more 2101 * entries present, or -EINVAL on error) 2102 */ 2103 2104 while (!ret) { 2105 ret = ieee80211_radiotap_iterator_next(&iterator); 2106 2107 if (ret) 2108 continue; 2109 2110 /* see if this argument is something we can use */ 2111 switch (iterator.this_arg_index) { 2112 /* 2113 * You must take care when dereferencing iterator.this_arg 2114 * for multibyte types... the pointer is not aligned. Use 2115 * get_unaligned((type *)iterator.this_arg) to dereference 2116 * iterator.this_arg for type "type" safely on all arches. 2117 */ 2118 case IEEE80211_RADIOTAP_FLAGS: 2119 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { 2120 /* 2121 * this indicates that the skb we have been 2122 * handed has the 32-bit FCS CRC at the end... 2123 * we should react to that by snipping it off 2124 * because it will be recomputed and added 2125 * on transmission 2126 */ 2127 if (skb->len < (iterator._max_length + FCS_LEN)) 2128 return false; 2129 2130 skb_trim(skb, skb->len - FCS_LEN); 2131 } 2132 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) 2133 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; 2134 if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) 2135 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; 2136 break; 2137 2138 case IEEE80211_RADIOTAP_TX_FLAGS: 2139 txflags = get_unaligned_le16(iterator.this_arg); 2140 if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) 2141 info->flags |= IEEE80211_TX_CTL_NO_ACK; 2142 if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO) 2143 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO; 2144 if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER) 2145 info->control.flags |= 2146 IEEE80211_TX_CTRL_DONT_REORDER; 2147 break; 2148 2149 case IEEE80211_RADIOTAP_RATE: 2150 rate = *iterator.this_arg; 2151 rate_flags = 0; 2152 rate_found = true; 2153 break; 2154 2155 case IEEE80211_RADIOTAP_DATA_RETRIES: 2156 rate_retries = *iterator.this_arg; 2157 break; 2158 2159 case IEEE80211_RADIOTAP_MCS: 2160 mcs_known = iterator.this_arg[0]; 2161 mcs_flags = iterator.this_arg[1]; 2162 if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS)) 2163 break; 2164 2165 rate_found = true; 2166 rate = iterator.this_arg[2]; 2167 rate_flags = IEEE80211_TX_RC_MCS; 2168 2169 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI && 2170 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI) 2171 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2172 2173 mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK; 2174 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW && 2175 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40) 2176 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; 2177 2178 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC && 2179 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC) 2180 info->flags |= IEEE80211_TX_CTL_LDPC; 2181 2182 if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) { 2183 u8 stbc = u8_get_bits(mcs_flags, 2184 IEEE80211_RADIOTAP_MCS_STBC_MASK); 2185 2186 info->flags |= 2187 u32_encode_bits(stbc, 2188 IEEE80211_TX_CTL_STBC); 2189 } 2190 break; 2191 2192 case IEEE80211_RADIOTAP_VHT: 2193 vht_known = get_unaligned_le16(iterator.this_arg); 2194 rate_found = true; 2195 2196 rate_flags = IEEE80211_TX_RC_VHT_MCS; 2197 if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) && 2198 (iterator.this_arg[2] & 2199 IEEE80211_RADIOTAP_VHT_FLAG_SGI)) 2200 rate_flags |= IEEE80211_TX_RC_SHORT_GI; 2201 if (vht_known & 2202 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) { 2203 if (iterator.this_arg[3] == 1) 2204 rate_flags |= 2205 IEEE80211_TX_RC_40_MHZ_WIDTH; 2206 else if (iterator.this_arg[3] == 4) 2207 rate_flags |= 2208 IEEE80211_TX_RC_80_MHZ_WIDTH; 2209 else if (iterator.this_arg[3] == 11) 2210 rate_flags |= 2211 IEEE80211_TX_RC_160_MHZ_WIDTH; 2212 } 2213 2214 vht_mcs = iterator.this_arg[4] >> 4; 2215 if (vht_mcs > 11) 2216 vht_mcs = 0; 2217 vht_nss = iterator.this_arg[4] & 0xF; 2218 if (!vht_nss || vht_nss > 8) 2219 vht_nss = 1; 2220 break; 2221 2222 /* 2223 * Please update the file 2224 * Documentation/networking/mac80211-injection.rst 2225 * when parsing new fields here. 2226 */ 2227 2228 default: 2229 break; 2230 } 2231 } 2232 2233 if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ 2234 return false; 2235 2236 if (rate_found) { 2237 struct ieee80211_supported_band *sband = 2238 local->hw.wiphy->bands[info->band]; 2239 2240 info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT; 2241 2242 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { 2243 info->control.rates[i].idx = -1; 2244 info->control.rates[i].flags = 0; 2245 info->control.rates[i].count = 0; 2246 } 2247 2248 if (rate_flags & IEEE80211_TX_RC_MCS) { 2249 info->control.rates[0].idx = rate; 2250 } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) { 2251 ieee80211_rate_set_vht(info->control.rates, vht_mcs, 2252 vht_nss); 2253 } else if (sband) { 2254 for (i = 0; i < sband->n_bitrates; i++) { 2255 if (rate * 5 != sband->bitrates[i].bitrate) 2256 continue; 2257 2258 info->control.rates[0].idx = i; 2259 break; 2260 } 2261 } 2262 2263 if (info->control.rates[0].idx < 0) 2264 info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT; 2265 2266 info->control.rates[0].flags = rate_flags; 2267 info->control.rates[0].count = min_t(u8, rate_retries + 1, 2268 local->hw.max_rate_tries); 2269 } 2270 2271 return true; 2272 } 2273 2274 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, 2275 struct net_device *dev) 2276 { 2277 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); 2278 struct ieee80211_chanctx_conf *chanctx_conf; 2279 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 2280 struct ieee80211_hdr *hdr; 2281 struct ieee80211_sub_if_data *tmp_sdata, *sdata; 2282 struct cfg80211_chan_def *chandef; 2283 u16 len_rthdr; 2284 int hdrlen; 2285 2286 memset(info, 0, sizeof(*info)); 2287 info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | 2288 IEEE80211_TX_CTL_INJECTED; 2289 2290 /* Sanity-check the length of the radiotap header */ 2291 if (!ieee80211_validate_radiotap_len(skb)) 2292 goto fail; 2293 2294 /* we now know there is a radiotap header with a length we can use */ 2295 len_rthdr = ieee80211_get_radiotap_len(skb->data); 2296 2297 /* 2298 * fix up the pointers accounting for the radiotap 2299 * header still being in there. We are being given 2300 * a precooked IEEE80211 header so no need for 2301 * normal processing 2302 */ 2303 skb_set_mac_header(skb, len_rthdr); 2304 /* 2305 * these are just fixed to the end of the rt area since we 2306 * don't have any better information and at this point, nobody cares 2307 */ 2308 skb_set_network_header(skb, len_rthdr); 2309 skb_set_transport_header(skb, len_rthdr); 2310 2311 if (skb->len < len_rthdr + 2) 2312 goto fail; 2313 2314 hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); 2315 hdrlen = ieee80211_hdrlen(hdr->frame_control); 2316 2317 if (skb->len < len_rthdr + hdrlen) 2318 goto fail; 2319 2320 /* 2321 * Initialize skb->protocol if the injected frame is a data frame 2322 * carrying a rfc1042 header 2323 */ 2324 if (ieee80211_is_data(hdr->frame_control) && 2325 skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { 2326 u8 *payload = (u8 *)hdr + hdrlen; 2327 2328 if (ether_addr_equal(payload, rfc1042_header)) 2329 skb->protocol = cpu_to_be16((payload[6] << 8) | 2330 payload[7]); 2331 } 2332 2333 rcu_read_lock(); 2334 2335 /* 2336 * We process outgoing injected frames that have a local address 2337 * we handle as though they are non-injected frames. 2338 * This code here isn't entirely correct, the local MAC address 2339 * isn't always enough to find the interface to use; for proper 2340 * VLAN support we have an nl80211-based mechanism. 2341 * 2342 * This is necessary, for example, for old hostapd versions that 2343 * don't use nl80211-based management TX/RX. 2344 */ 2345 sdata = IEEE80211_DEV_TO_SUB_IF(dev); 2346 2347 list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { 2348 if (!ieee80211_sdata_running(tmp_sdata)) 2349 continue; 2350 if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || 2351 tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 2352 continue; 2353 if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { 2354 sdata = tmp_sdata; 2355 break; 2356 } 2357 } 2358 2359 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2360 if (!chanctx_conf) { 2361 tmp_sdata = rcu_dereference(local->monitor_sdata); 2362 if (tmp_sdata) 2363 chanctx_conf = 2364 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf); 2365 } 2366 2367 if (chanctx_conf) 2368 chandef = &chanctx_conf->def; 2369 else if (!local->use_chanctx) 2370 chandef = &local->_oper_chandef; 2371 else 2372 goto fail_rcu; 2373 2374 /* 2375 * Frame injection is not allowed if beaconing is not allowed 2376 * or if we need radar detection. Beaconing is usually not allowed when 2377 * the mode or operation (Adhoc, AP, Mesh) does not support DFS. 2378 * Passive scan is also used in world regulatory domains where 2379 * your country is not known and as such it should be treated as 2380 * NO TX unless the channel is explicitly allowed in which case 2381 * your current regulatory domain would not have the passive scan 2382 * flag. 2383 * 2384 * Since AP mode uses monitor interfaces to inject/TX management 2385 * frames we can make AP mode the exception to this rule once it 2386 * supports radar detection as its implementation can deal with 2387 * radar detection by itself. We can do that later by adding a 2388 * monitor flag interfaces used for AP support. 2389 */ 2390 if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef, 2391 sdata->vif.type)) 2392 goto fail_rcu; 2393 2394 info->band = chandef->chan->band; 2395 2396 /* Initialize skb->priority according to frame type and TID class, 2397 * with respect to the sub interface that the frame will actually 2398 * be transmitted on. If the DONT_REORDER flag is set, the original 2399 * skb-priority is preserved to assure frames injected with this 2400 * flag are not reordered relative to each other. 2401 */ 2402 ieee80211_select_queue_80211(sdata, skb, hdr); 2403 skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority)); 2404 2405 /* 2406 * Process the radiotap header. This will now take into account the 2407 * selected chandef above to accurately set injection rates and 2408 * retransmissions. 2409 */ 2410 if (!ieee80211_parse_tx_radiotap(skb, dev)) 2411 goto fail_rcu; 2412 2413 /* remove the injection radiotap header */ 2414 skb_pull(skb, len_rthdr); 2415 2416 ieee80211_xmit(sdata, NULL, skb); 2417 rcu_read_unlock(); 2418 2419 return NETDEV_TX_OK; 2420 2421 fail_rcu: 2422 rcu_read_unlock(); 2423 fail: 2424 dev_kfree_skb(skb); 2425 return NETDEV_TX_OK; /* meaning, we dealt with the skb */ 2426 } 2427 2428 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb) 2429 { 2430 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 2431 2432 return ethertype == ETH_P_TDLS && 2433 skb->len > 14 && 2434 skb->data[14] == WLAN_TDLS_SNAP_RFTYPE; 2435 } 2436 2437 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata, 2438 struct sk_buff *skb, 2439 struct sta_info **sta_out) 2440 { 2441 struct sta_info *sta; 2442 2443 switch (sdata->vif.type) { 2444 case NL80211_IFTYPE_AP_VLAN: 2445 sta = rcu_dereference(sdata->u.vlan.sta); 2446 if (sta) { 2447 *sta_out = sta; 2448 return 0; 2449 } else if (sdata->wdev.use_4addr) { 2450 return -ENOLINK; 2451 } 2452 fallthrough; 2453 case NL80211_IFTYPE_AP: 2454 case NL80211_IFTYPE_OCB: 2455 case NL80211_IFTYPE_ADHOC: 2456 if (is_multicast_ether_addr(skb->data)) { 2457 *sta_out = ERR_PTR(-ENOENT); 2458 return 0; 2459 } 2460 sta = sta_info_get_bss(sdata, skb->data); 2461 break; 2462 #ifdef CONFIG_MAC80211_MESH 2463 case NL80211_IFTYPE_MESH_POINT: 2464 /* determined much later */ 2465 *sta_out = NULL; 2466 return 0; 2467 #endif 2468 case NL80211_IFTYPE_STATION: 2469 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { 2470 sta = sta_info_get(sdata, skb->data); 2471 if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 2472 if (test_sta_flag(sta, 2473 WLAN_STA_TDLS_PEER_AUTH)) { 2474 *sta_out = sta; 2475 return 0; 2476 } 2477 2478 /* 2479 * TDLS link during setup - throw out frames to 2480 * peer. Allow TDLS-setup frames to unauthorized 2481 * peers for the special case of a link teardown 2482 * after a TDLS sta is removed due to being 2483 * unreachable. 2484 */ 2485 if (!ieee80211_is_tdls_setup(skb)) 2486 return -EINVAL; 2487 } 2488 2489 } 2490 2491 sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr); 2492 if (!sta) 2493 return -ENOLINK; 2494 break; 2495 default: 2496 return -EINVAL; 2497 } 2498 2499 *sta_out = sta ?: ERR_PTR(-ENOENT); 2500 return 0; 2501 } 2502 2503 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local, 2504 struct sk_buff *skb, 2505 u32 *info_flags, 2506 u64 *cookie) 2507 { 2508 struct sk_buff *ack_skb; 2509 u16 info_id = 0; 2510 2511 if (skb->sk) 2512 ack_skb = skb_clone_sk(skb); 2513 else 2514 ack_skb = skb_clone(skb, GFP_ATOMIC); 2515 2516 if (ack_skb) { 2517 unsigned long flags; 2518 int id; 2519 2520 spin_lock_irqsave(&local->ack_status_lock, flags); 2521 id = idr_alloc(&local->ack_status_frames, ack_skb, 2522 1, 0x2000, GFP_ATOMIC); 2523 spin_unlock_irqrestore(&local->ack_status_lock, flags); 2524 2525 if (id >= 0) { 2526 info_id = id; 2527 *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2528 if (cookie) { 2529 *cookie = ieee80211_mgmt_tx_cookie(local); 2530 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie; 2531 } 2532 } else { 2533 kfree_skb(ack_skb); 2534 } 2535 } 2536 2537 return info_id; 2538 } 2539 2540 /** 2541 * ieee80211_build_hdr - build 802.11 header in the given frame 2542 * @sdata: virtual interface to build the header for 2543 * @skb: the skb to build the header in 2544 * @info_flags: skb flags to set 2545 * @sta: the station pointer 2546 * @ctrl_flags: info control flags to set 2547 * @cookie: cookie pointer to fill (if not %NULL) 2548 * 2549 * This function takes the skb with 802.3 header and reformats the header to 2550 * the appropriate IEEE 802.11 header based on which interface the packet is 2551 * being transmitted on. 2552 * 2553 * Note that this function also takes care of the TX status request and 2554 * potential unsharing of the SKB - this needs to be interleaved with the 2555 * header building. 2556 * 2557 * The function requires the read-side RCU lock held 2558 * 2559 * Returns: the (possibly reallocated) skb or an ERR_PTR() code 2560 */ 2561 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata, 2562 struct sk_buff *skb, u32 info_flags, 2563 struct sta_info *sta, u32 ctrl_flags, 2564 u64 *cookie) 2565 { 2566 struct ieee80211_local *local = sdata->local; 2567 struct ieee80211_tx_info *info; 2568 int head_need; 2569 u16 ethertype, hdrlen, meshhdrlen = 0; 2570 __le16 fc; 2571 struct ieee80211_hdr hdr; 2572 struct ieee80211s_hdr mesh_hdr __maybe_unused; 2573 struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; 2574 const u8 *encaps_data; 2575 int encaps_len, skip_header_bytes; 2576 bool wme_sta = false, authorized = false; 2577 bool tdls_peer; 2578 bool multicast; 2579 u16 info_id = 0; 2580 struct ieee80211_chanctx_conf *chanctx_conf = NULL; 2581 enum nl80211_band band; 2582 int ret; 2583 u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK); 2584 2585 if (IS_ERR(sta)) 2586 sta = NULL; 2587 2588 #ifdef CONFIG_MAC80211_DEBUGFS 2589 if (local->force_tx_status) 2590 info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 2591 #endif 2592 2593 /* convert Ethernet header to proper 802.11 header (based on 2594 * operation mode) */ 2595 ethertype = (skb->data[12] << 8) | skb->data[13]; 2596 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 2597 2598 if (!sdata->vif.valid_links) 2599 chanctx_conf = 2600 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 2601 2602 switch (sdata->vif.type) { 2603 case NL80211_IFTYPE_AP_VLAN: 2604 if (sdata->wdev.use_4addr) { 2605 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); 2606 /* RA TA DA SA */ 2607 memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); 2608 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2609 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2610 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2611 hdrlen = 30; 2612 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2613 wme_sta = sta->sta.wme; 2614 } 2615 if (!sdata->vif.valid_links) { 2616 struct ieee80211_sub_if_data *ap_sdata; 2617 2618 /* override chanctx_conf from AP (we don't have one) */ 2619 ap_sdata = container_of(sdata->bss, 2620 struct ieee80211_sub_if_data, 2621 u.ap); 2622 chanctx_conf = 2623 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf); 2624 } 2625 if (sdata->wdev.use_4addr) 2626 break; 2627 fallthrough; 2628 case NL80211_IFTYPE_AP: 2629 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 2630 /* DA BSSID SA */ 2631 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2632 2633 if (sdata->vif.valid_links && sta && !sta->sta.mlo) { 2634 struct ieee80211_link_data *link; 2635 2636 link_id = sta->deflink.link_id; 2637 link = rcu_dereference(sdata->link[link_id]); 2638 if (WARN_ON(!link)) { 2639 ret = -ENOLINK; 2640 goto free; 2641 } 2642 memcpy(hdr.addr2, link->conf->addr, ETH_ALEN); 2643 } else if (link_id == IEEE80211_LINK_UNSPECIFIED) { 2644 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2645 } else { 2646 struct ieee80211_bss_conf *conf; 2647 2648 conf = rcu_dereference(sdata->vif.link_conf[link_id]); 2649 if (unlikely(!conf)) { 2650 ret = -ENOLINK; 2651 goto free; 2652 } 2653 2654 memcpy(hdr.addr2, conf->addr, ETH_ALEN); 2655 } 2656 2657 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); 2658 hdrlen = 24; 2659 break; 2660 #ifdef CONFIG_MAC80211_MESH 2661 case NL80211_IFTYPE_MESH_POINT: 2662 if (!is_multicast_ether_addr(skb->data)) { 2663 struct sta_info *next_hop; 2664 bool mpp_lookup = true; 2665 2666 mpath = mesh_path_lookup(sdata, skb->data); 2667 if (mpath) { 2668 mpp_lookup = false; 2669 next_hop = rcu_dereference(mpath->next_hop); 2670 if (!next_hop || 2671 !(mpath->flags & (MESH_PATH_ACTIVE | 2672 MESH_PATH_RESOLVING))) 2673 mpp_lookup = true; 2674 } 2675 2676 if (mpp_lookup) { 2677 mppath = mpp_path_lookup(sdata, skb->data); 2678 if (mppath) 2679 mppath->exp_time = jiffies; 2680 } 2681 2682 if (mppath && mpath) 2683 mesh_path_del(sdata, mpath->dst); 2684 } 2685 2686 /* 2687 * Use address extension if it is a packet from 2688 * another interface or if we know the destination 2689 * is being proxied by a portal (i.e. portal address 2690 * differs from proxied address) 2691 */ 2692 if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && 2693 !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { 2694 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2695 skb->data, skb->data + ETH_ALEN); 2696 meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, 2697 NULL, NULL); 2698 } else { 2699 /* DS -> MBSS (802.11-2012 13.11.3.3). 2700 * For unicast with unknown forwarding information, 2701 * destination might be in the MBSS or if that fails 2702 * forwarded to another mesh gate. In either case 2703 * resolution will be handled in ieee80211_xmit(), so 2704 * leave the original DA. This also works for mcast */ 2705 const u8 *mesh_da = skb->data; 2706 2707 if (mppath) 2708 mesh_da = mppath->mpp; 2709 else if (mpath) 2710 mesh_da = mpath->dst; 2711 2712 hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, 2713 mesh_da, sdata->vif.addr); 2714 if (is_multicast_ether_addr(mesh_da)) 2715 /* DA TA mSA AE:SA */ 2716 meshhdrlen = ieee80211_new_mesh_header( 2717 sdata, &mesh_hdr, 2718 skb->data + ETH_ALEN, NULL); 2719 else 2720 /* RA TA mDA mSA AE:DA SA */ 2721 meshhdrlen = ieee80211_new_mesh_header( 2722 sdata, &mesh_hdr, skb->data, 2723 skb->data + ETH_ALEN); 2724 2725 } 2726 2727 /* For injected frames, fill RA right away as nexthop lookup 2728 * will be skipped. 2729 */ 2730 if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) && 2731 is_zero_ether_addr(hdr.addr1)) 2732 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2733 break; 2734 #endif 2735 case NL80211_IFTYPE_STATION: 2736 /* we already did checks when looking up the RA STA */ 2737 tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); 2738 2739 if (tdls_peer) { 2740 /* DA SA BSSID */ 2741 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2742 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2743 memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2744 hdrlen = 24; 2745 } else if (sdata->u.mgd.use_4addr && 2746 cpu_to_be16(ethertype) != sdata->control_port_protocol) { 2747 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 2748 IEEE80211_FCTL_TODS); 2749 /* RA TA DA SA */ 2750 memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 2751 memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); 2752 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2753 memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); 2754 hdrlen = 30; 2755 } else { 2756 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 2757 /* BSSID SA DA */ 2758 memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 2759 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2760 memcpy(hdr.addr3, skb->data, ETH_ALEN); 2761 hdrlen = 24; 2762 } 2763 break; 2764 case NL80211_IFTYPE_OCB: 2765 /* DA SA BSSID */ 2766 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2767 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2768 eth_broadcast_addr(hdr.addr3); 2769 hdrlen = 24; 2770 break; 2771 case NL80211_IFTYPE_ADHOC: 2772 /* DA SA BSSID */ 2773 memcpy(hdr.addr1, skb->data, ETH_ALEN); 2774 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); 2775 memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); 2776 hdrlen = 24; 2777 break; 2778 default: 2779 ret = -EINVAL; 2780 goto free; 2781 } 2782 2783 if (!chanctx_conf) { 2784 if (!sdata->vif.valid_links) { 2785 ret = -ENOTCONN; 2786 goto free; 2787 } 2788 /* MLD transmissions must not rely on the band */ 2789 band = 0; 2790 } else { 2791 band = chanctx_conf->def.chan->band; 2792 } 2793 2794 multicast = is_multicast_ether_addr(hdr.addr1); 2795 2796 /* sta is always NULL for mesh */ 2797 if (sta) { 2798 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); 2799 wme_sta = sta->sta.wme; 2800 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 2801 /* For mesh, the use of the QoS header is mandatory */ 2802 wme_sta = true; 2803 } 2804 2805 /* receiver does QoS (which also means we do) use it */ 2806 if (wme_sta) { 2807 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 2808 hdrlen += 2; 2809 } 2810 2811 /* 2812 * Drop unicast frames to unauthorised stations unless they are 2813 * EAPOL frames from the local station. 2814 */ 2815 if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && 2816 (sdata->vif.type != NL80211_IFTYPE_OCB) && 2817 !multicast && !authorized && 2818 (cpu_to_be16(ethertype) != sdata->control_port_protocol || 2819 !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) { 2820 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG 2821 net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", 2822 sdata->name, hdr.addr1); 2823 #endif 2824 2825 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 2826 2827 ret = -EPERM; 2828 goto free; 2829 } 2830 2831 if (unlikely(!multicast && ((skb->sk && 2832 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) || 2833 ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS))) 2834 info_id = ieee80211_store_ack_skb(local, skb, &info_flags, 2835 cookie); 2836 2837 /* 2838 * If the skb is shared we need to obtain our own copy. 2839 */ 2840 skb = skb_share_check(skb, GFP_ATOMIC); 2841 if (unlikely(!skb)) { 2842 ret = -ENOMEM; 2843 goto free; 2844 } 2845 2846 hdr.frame_control = fc; 2847 hdr.duration_id = 0; 2848 hdr.seq_ctrl = 0; 2849 2850 skip_header_bytes = ETH_HLEN; 2851 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { 2852 encaps_data = bridge_tunnel_header; 2853 encaps_len = sizeof(bridge_tunnel_header); 2854 skip_header_bytes -= 2; 2855 } else if (ethertype >= ETH_P_802_3_MIN) { 2856 encaps_data = rfc1042_header; 2857 encaps_len = sizeof(rfc1042_header); 2858 skip_header_bytes -= 2; 2859 } else { 2860 encaps_data = NULL; 2861 encaps_len = 0; 2862 } 2863 2864 skb_pull(skb, skip_header_bytes); 2865 head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); 2866 2867 /* 2868 * So we need to modify the skb header and hence need a copy of 2869 * that. The head_need variable above doesn't, so far, include 2870 * the needed header space that we don't need right away. If we 2871 * can, then we don't reallocate right now but only after the 2872 * frame arrives at the master device (if it does...) 2873 * 2874 * If we cannot, however, then we will reallocate to include all 2875 * the ever needed space. Also, if we need to reallocate it anyway, 2876 * make it big enough for everything we may ever need. 2877 */ 2878 2879 if (head_need > 0 || skb_cloned(skb)) { 2880 head_need += IEEE80211_ENCRYPT_HEADROOM; 2881 head_need += local->tx_headroom; 2882 head_need = max_t(int, 0, head_need); 2883 if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) { 2884 ieee80211_free_txskb(&local->hw, skb); 2885 skb = NULL; 2886 return ERR_PTR(-ENOMEM); 2887 } 2888 } 2889 2890 if (encaps_data) 2891 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); 2892 2893 #ifdef CONFIG_MAC80211_MESH 2894 if (meshhdrlen > 0) 2895 memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); 2896 #endif 2897 2898 if (ieee80211_is_data_qos(fc)) { 2899 __le16 *qos_control; 2900 2901 qos_control = skb_push(skb, 2); 2902 memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); 2903 /* 2904 * Maybe we could actually set some fields here, for now just 2905 * initialise to zero to indicate no special operation. 2906 */ 2907 *qos_control = 0; 2908 } else 2909 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); 2910 2911 skb_reset_mac_header(skb); 2912 2913 info = IEEE80211_SKB_CB(skb); 2914 memset(info, 0, sizeof(*info)); 2915 2916 info->flags = info_flags; 2917 info->ack_frame_id = info_id; 2918 info->band = band; 2919 2920 if (likely(!cookie)) { 2921 ctrl_flags |= u32_encode_bits(link_id, 2922 IEEE80211_TX_CTRL_MLO_LINK); 2923 } else { 2924 unsigned int pre_conf_link_id; 2925 2926 /* 2927 * ctrl_flags already have been set by 2928 * ieee80211_tx_control_port(), here 2929 * we just sanity check that 2930 */ 2931 2932 pre_conf_link_id = u32_get_bits(ctrl_flags, 2933 IEEE80211_TX_CTRL_MLO_LINK); 2934 2935 if (pre_conf_link_id != link_id && 2936 link_id != IEEE80211_LINK_UNSPECIFIED) { 2937 #ifdef CPTCFG_MAC80211_VERBOSE_DEBUG 2938 net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n", 2939 sdata->name, hdr.addr1, 2940 pre_conf_link_id, link_id); 2941 #endif 2942 ret = -EINVAL; 2943 goto free; 2944 } 2945 } 2946 2947 info->control.flags = ctrl_flags; 2948 2949 return skb; 2950 free: 2951 kfree_skb(skb); 2952 return ERR_PTR(ret); 2953 } 2954 2955 /* 2956 * fast-xmit overview 2957 * 2958 * The core idea of this fast-xmit is to remove per-packet checks by checking 2959 * them out of band. ieee80211_check_fast_xmit() implements the out-of-band 2960 * checks that are needed to get the sta->fast_tx pointer assigned, after which 2961 * much less work can be done per packet. For example, fragmentation must be 2962 * disabled or the fast_tx pointer will not be set. All the conditions are seen 2963 * in the code here. 2964 * 2965 * Once assigned, the fast_tx data structure also caches the per-packet 802.11 2966 * header and other data to aid packet processing in ieee80211_xmit_fast(). 2967 * 2968 * The most difficult part of this is that when any of these assumptions 2969 * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(), 2970 * ieee80211_check_fast_xmit() or friends) is required to reset the data, 2971 * since the per-packet code no longer checks the conditions. This is reflected 2972 * by the calls to these functions throughout the rest of the code, and must be 2973 * maintained if any of the TX path checks change. 2974 */ 2975 2976 void ieee80211_check_fast_xmit(struct sta_info *sta) 2977 { 2978 struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old; 2979 struct ieee80211_local *local = sta->local; 2980 struct ieee80211_sub_if_data *sdata = sta->sdata; 2981 struct ieee80211_hdr *hdr = (void *)build.hdr; 2982 struct ieee80211_chanctx_conf *chanctx_conf; 2983 __le16 fc; 2984 2985 if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT)) 2986 return; 2987 2988 /* Locking here protects both the pointer itself, and against concurrent 2989 * invocations winning data access races to, e.g., the key pointer that 2990 * is used. 2991 * Without it, the invocation of this function right after the key 2992 * pointer changes wouldn't be sufficient, as another CPU could access 2993 * the pointer, then stall, and then do the cache update after the CPU 2994 * that invalidated the key. 2995 * With the locking, such scenarios cannot happen as the check for the 2996 * key and the fast-tx assignment are done atomically, so the CPU that 2997 * modifies the key will either wait or other one will see the key 2998 * cleared/changed already. 2999 */ 3000 spin_lock_bh(&sta->lock); 3001 if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && 3002 !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && 3003 sdata->vif.type == NL80211_IFTYPE_STATION) 3004 goto out; 3005 3006 if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) 3007 goto out; 3008 3009 if (test_sta_flag(sta, WLAN_STA_PS_STA) || 3010 test_sta_flag(sta, WLAN_STA_PS_DRIVER) || 3011 test_sta_flag(sta, WLAN_STA_PS_DELIVER) || 3012 test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT)) 3013 goto out; 3014 3015 if (sdata->noack_map) 3016 goto out; 3017 3018 /* fast-xmit doesn't handle fragmentation at all */ 3019 if (local->hw.wiphy->frag_threshold != (u32)-1 && 3020 !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG)) 3021 goto out; 3022 3023 if (!sdata->vif.valid_links) { 3024 rcu_read_lock(); 3025 chanctx_conf = 3026 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 3027 if (!chanctx_conf) { 3028 rcu_read_unlock(); 3029 goto out; 3030 } 3031 build.band = chanctx_conf->def.chan->band; 3032 rcu_read_unlock(); 3033 } else { 3034 /* MLD transmissions must not rely on the band */ 3035 build.band = 0; 3036 } 3037 3038 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); 3039 3040 switch (sdata->vif.type) { 3041 case NL80211_IFTYPE_ADHOC: 3042 /* DA SA BSSID */ 3043 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3044 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3045 memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN); 3046 build.hdr_len = 24; 3047 break; 3048 case NL80211_IFTYPE_STATION: 3049 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) { 3050 /* DA SA BSSID */ 3051 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3052 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3053 memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3054 build.hdr_len = 24; 3055 break; 3056 } 3057 3058 if (sdata->u.mgd.use_4addr) { 3059 /* non-regular ethertype cannot use the fastpath */ 3060 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3061 IEEE80211_FCTL_TODS); 3062 /* RA TA DA SA */ 3063 memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 3064 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3065 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3066 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3067 build.hdr_len = 30; 3068 break; 3069 } 3070 fc |= cpu_to_le16(IEEE80211_FCTL_TODS); 3071 /* BSSID SA DA */ 3072 memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN); 3073 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3074 build.sa_offs = offsetof(struct ieee80211_hdr, addr2); 3075 build.hdr_len = 24; 3076 break; 3077 case NL80211_IFTYPE_AP_VLAN: 3078 if (sdata->wdev.use_4addr) { 3079 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | 3080 IEEE80211_FCTL_TODS); 3081 /* RA TA DA SA */ 3082 memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN); 3083 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3084 build.da_offs = offsetof(struct ieee80211_hdr, addr3); 3085 build.sa_offs = offsetof(struct ieee80211_hdr, addr4); 3086 build.hdr_len = 30; 3087 break; 3088 } 3089 fallthrough; 3090 case NL80211_IFTYPE_AP: 3091 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); 3092 /* DA BSSID SA */ 3093 build.da_offs = offsetof(struct ieee80211_hdr, addr1); 3094 if (sta->sta.mlo || !sdata->vif.valid_links) { 3095 memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN); 3096 } else { 3097 unsigned int link_id = sta->deflink.link_id; 3098 struct ieee80211_link_data *link; 3099 3100 rcu_read_lock(); 3101 link = rcu_dereference(sdata->link[link_id]); 3102 if (WARN_ON(!link)) { 3103 rcu_read_unlock(); 3104 goto out; 3105 } 3106 memcpy(hdr->addr2, link->conf->addr, ETH_ALEN); 3107 rcu_read_unlock(); 3108 } 3109 build.sa_offs = offsetof(struct ieee80211_hdr, addr3); 3110 build.hdr_len = 24; 3111 break; 3112 default: 3113 /* not handled on fast-xmit */ 3114 goto out; 3115 } 3116 3117 if (sta->sta.wme) { 3118 build.hdr_len += 2; 3119 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); 3120 } 3121 3122 /* We store the key here so there's no point in using rcu_dereference() 3123 * but that's fine because the code that changes the pointers will call 3124 * this function after doing so. For a single CPU that would be enough, 3125 * for multiple see the comment above. 3126 */ 3127 build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]); 3128 if (!build.key) 3129 build.key = rcu_access_pointer(sdata->default_unicast_key); 3130 if (build.key) { 3131 bool gen_iv, iv_spc, mmic; 3132 3133 gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV; 3134 iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE; 3135 mmic = build.key->conf.flags & 3136 (IEEE80211_KEY_FLAG_GENERATE_MMIC | 3137 IEEE80211_KEY_FLAG_PUT_MIC_SPACE); 3138 3139 /* don't handle software crypto */ 3140 if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) 3141 goto out; 3142 3143 /* Key is being removed */ 3144 if (build.key->flags & KEY_FLAG_TAINTED) 3145 goto out; 3146 3147 switch (build.key->conf.cipher) { 3148 case WLAN_CIPHER_SUITE_CCMP: 3149 case WLAN_CIPHER_SUITE_CCMP_256: 3150 if (gen_iv) 3151 build.pn_offs = build.hdr_len; 3152 if (gen_iv || iv_spc) 3153 build.hdr_len += IEEE80211_CCMP_HDR_LEN; 3154 break; 3155 case WLAN_CIPHER_SUITE_GCMP: 3156 case WLAN_CIPHER_SUITE_GCMP_256: 3157 if (gen_iv) 3158 build.pn_offs = build.hdr_len; 3159 if (gen_iv || iv_spc) 3160 build.hdr_len += IEEE80211_GCMP_HDR_LEN; 3161 break; 3162 case WLAN_CIPHER_SUITE_TKIP: 3163 /* cannot handle MMIC or IV generation in xmit-fast */ 3164 if (mmic || gen_iv) 3165 goto out; 3166 if (iv_spc) 3167 build.hdr_len += IEEE80211_TKIP_IV_LEN; 3168 break; 3169 case WLAN_CIPHER_SUITE_WEP40: 3170 case WLAN_CIPHER_SUITE_WEP104: 3171 /* cannot handle IV generation in fast-xmit */ 3172 if (gen_iv) 3173 goto out; 3174 if (iv_spc) 3175 build.hdr_len += IEEE80211_WEP_IV_LEN; 3176 break; 3177 case WLAN_CIPHER_SUITE_AES_CMAC: 3178 case WLAN_CIPHER_SUITE_BIP_CMAC_256: 3179 case WLAN_CIPHER_SUITE_BIP_GMAC_128: 3180 case WLAN_CIPHER_SUITE_BIP_GMAC_256: 3181 WARN(1, 3182 "management cipher suite 0x%x enabled for data\n", 3183 build.key->conf.cipher); 3184 goto out; 3185 default: 3186 /* we don't know how to generate IVs for this at all */ 3187 if (WARN_ON(gen_iv)) 3188 goto out; 3189 } 3190 3191 fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 3192 } 3193 3194 hdr->frame_control = fc; 3195 3196 memcpy(build.hdr + build.hdr_len, 3197 rfc1042_header, sizeof(rfc1042_header)); 3198 build.hdr_len += sizeof(rfc1042_header); 3199 3200 fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC); 3201 /* if the kmemdup fails, continue w/o fast_tx */ 3202 3203 out: 3204 /* we might have raced against another call to this function */ 3205 old = rcu_dereference_protected(sta->fast_tx, 3206 lockdep_is_held(&sta->lock)); 3207 rcu_assign_pointer(sta->fast_tx, fast_tx); 3208 if (old) 3209 kfree_rcu(old, rcu_head); 3210 spin_unlock_bh(&sta->lock); 3211 } 3212 3213 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local) 3214 { 3215 struct sta_info *sta; 3216 3217 rcu_read_lock(); 3218 list_for_each_entry_rcu(sta, &local->sta_list, list) 3219 ieee80211_check_fast_xmit(sta); 3220 rcu_read_unlock(); 3221 } 3222 3223 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata) 3224 { 3225 struct ieee80211_local *local = sdata->local; 3226 struct sta_info *sta; 3227 3228 rcu_read_lock(); 3229 3230 list_for_each_entry_rcu(sta, &local->sta_list, list) { 3231 if (sdata != sta->sdata && 3232 (!sta->sdata->bss || sta->sdata->bss != sdata->bss)) 3233 continue; 3234 ieee80211_check_fast_xmit(sta); 3235 } 3236 3237 rcu_read_unlock(); 3238 } 3239 3240 void ieee80211_clear_fast_xmit(struct sta_info *sta) 3241 { 3242 struct ieee80211_fast_tx *fast_tx; 3243 3244 spin_lock_bh(&sta->lock); 3245 fast_tx = rcu_dereference_protected(sta->fast_tx, 3246 lockdep_is_held(&sta->lock)); 3247 RCU_INIT_POINTER(sta->fast_tx, NULL); 3248 spin_unlock_bh(&sta->lock); 3249 3250 if (fast_tx) 3251 kfree_rcu(fast_tx, rcu_head); 3252 } 3253 3254 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local, 3255 struct sk_buff *skb, int headroom) 3256 { 3257 if (skb_headroom(skb) < headroom) { 3258 I802_DEBUG_INC(local->tx_expand_skb_head); 3259 3260 if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) { 3261 wiphy_debug(local->hw.wiphy, 3262 "failed to reallocate TX buffer\n"); 3263 return false; 3264 } 3265 } 3266 3267 return true; 3268 } 3269 3270 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata, 3271 struct ieee80211_fast_tx *fast_tx, 3272 struct sk_buff *skb) 3273 { 3274 struct ieee80211_local *local = sdata->local; 3275 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3276 struct ieee80211_hdr *hdr; 3277 struct ethhdr *amsdu_hdr; 3278 int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header); 3279 int subframe_len = skb->len - hdr_len; 3280 void *data; 3281 u8 *qc, *h_80211_src, *h_80211_dst; 3282 const u8 *bssid; 3283 3284 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 3285 return false; 3286 3287 if (info->control.flags & IEEE80211_TX_CTRL_AMSDU) 3288 return true; 3289 3290 if (!ieee80211_amsdu_realloc_pad(local, skb, 3291 sizeof(*amsdu_hdr) + 3292 local->hw.extra_tx_headroom)) 3293 return false; 3294 3295 data = skb_push(skb, sizeof(*amsdu_hdr)); 3296 memmove(data, data + sizeof(*amsdu_hdr), hdr_len); 3297 hdr = data; 3298 amsdu_hdr = data + hdr_len; 3299 /* h_80211_src/dst is addr* field within hdr */ 3300 h_80211_src = data + fast_tx->sa_offs; 3301 h_80211_dst = data + fast_tx->da_offs; 3302 3303 amsdu_hdr->h_proto = cpu_to_be16(subframe_len); 3304 ether_addr_copy(amsdu_hdr->h_source, h_80211_src); 3305 ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst); 3306 3307 /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA 3308 * fields needs to be changed to BSSID for A-MSDU frames depending 3309 * on FromDS/ToDS values. 3310 */ 3311 switch (sdata->vif.type) { 3312 case NL80211_IFTYPE_STATION: 3313 bssid = sdata->vif.cfg.ap_addr; 3314 break; 3315 case NL80211_IFTYPE_AP: 3316 case NL80211_IFTYPE_AP_VLAN: 3317 bssid = sdata->vif.addr; 3318 break; 3319 default: 3320 bssid = NULL; 3321 } 3322 3323 if (bssid && ieee80211_has_fromds(hdr->frame_control)) 3324 ether_addr_copy(h_80211_src, bssid); 3325 3326 if (bssid && ieee80211_has_tods(hdr->frame_control)) 3327 ether_addr_copy(h_80211_dst, bssid); 3328 3329 qc = ieee80211_get_qos_ctl(hdr); 3330 *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT; 3331 3332 info->control.flags |= IEEE80211_TX_CTRL_AMSDU; 3333 3334 return true; 3335 } 3336 3337 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata, 3338 struct sta_info *sta, 3339 struct ieee80211_fast_tx *fast_tx, 3340 struct sk_buff *skb) 3341 { 3342 struct ieee80211_local *local = sdata->local; 3343 struct fq *fq = &local->fq; 3344 struct fq_tin *tin; 3345 struct fq_flow *flow; 3346 u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3347 struct ieee80211_txq *txq = sta->sta.txq[tid]; 3348 struct txq_info *txqi; 3349 struct sk_buff **frag_tail, *head; 3350 int subframe_len = skb->len - ETH_ALEN; 3351 u8 max_subframes = sta->sta.max_amsdu_subframes; 3352 int max_frags = local->hw.max_tx_fragments; 3353 int max_amsdu_len = sta->sta.max_amsdu_len; 3354 int orig_truesize; 3355 u32 flow_idx; 3356 __be16 len; 3357 void *data; 3358 bool ret = false; 3359 unsigned int orig_len; 3360 int n = 2, nfrags, pad = 0; 3361 u16 hdrlen; 3362 3363 if (!ieee80211_hw_check(&local->hw, TX_AMSDU)) 3364 return false; 3365 3366 if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED) 3367 return false; 3368 3369 if (skb_is_gso(skb)) 3370 return false; 3371 3372 if (!txq) 3373 return false; 3374 3375 txqi = to_txq_info(txq); 3376 if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags)) 3377 return false; 3378 3379 if (sta->sta.max_rc_amsdu_len) 3380 max_amsdu_len = min_t(int, max_amsdu_len, 3381 sta->sta.max_rc_amsdu_len); 3382 3383 if (sta->sta.max_tid_amsdu_len[tid]) 3384 max_amsdu_len = min_t(int, max_amsdu_len, 3385 sta->sta.max_tid_amsdu_len[tid]); 3386 3387 flow_idx = fq_flow_idx(fq, skb); 3388 3389 spin_lock_bh(&fq->lock); 3390 3391 /* TODO: Ideally aggregation should be done on dequeue to remain 3392 * responsive to environment changes. 3393 */ 3394 3395 tin = &txqi->tin; 3396 flow = fq_flow_classify(fq, tin, flow_idx, skb); 3397 head = skb_peek_tail(&flow->queue); 3398 if (!head || skb_is_gso(head)) 3399 goto out; 3400 3401 orig_truesize = head->truesize; 3402 orig_len = head->len; 3403 3404 if (skb->len + head->len > max_amsdu_len) 3405 goto out; 3406 3407 nfrags = 1 + skb_shinfo(skb)->nr_frags; 3408 nfrags += 1 + skb_shinfo(head)->nr_frags; 3409 frag_tail = &skb_shinfo(head)->frag_list; 3410 while (*frag_tail) { 3411 nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags; 3412 frag_tail = &(*frag_tail)->next; 3413 n++; 3414 } 3415 3416 if (max_subframes && n > max_subframes) 3417 goto out; 3418 3419 if (max_frags && nfrags > max_frags) 3420 goto out; 3421 3422 if (!drv_can_aggregate_in_amsdu(local, head, skb)) 3423 goto out; 3424 3425 if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) 3426 goto out; 3427 3428 /* If n == 2, the "while (*frag_tail)" loop above didn't execute 3429 * and frag_tail should be &skb_shinfo(head)->frag_list. 3430 * However, ieee80211_amsdu_prepare_head() can reallocate it. 3431 * Reload frag_tail to have it pointing to the correct place. 3432 */ 3433 if (n == 2) 3434 frag_tail = &skb_shinfo(head)->frag_list; 3435 3436 /* 3437 * Pad out the previous subframe to a multiple of 4 by adding the 3438 * padding to the next one, that's being added. Note that head->len 3439 * is the length of the full A-MSDU, but that works since each time 3440 * we add a new subframe we pad out the previous one to a multiple 3441 * of 4 and thus it no longer matters in the next round. 3442 */ 3443 hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header); 3444 if ((head->len - hdrlen) & 3) 3445 pad = 4 - ((head->len - hdrlen) & 3); 3446 3447 if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) + 3448 2 + pad)) 3449 goto out_recalc; 3450 3451 ret = true; 3452 data = skb_push(skb, ETH_ALEN + 2); 3453 memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN); 3454 3455 data += 2 * ETH_ALEN; 3456 len = cpu_to_be16(subframe_len); 3457 memcpy(data, &len, 2); 3458 memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header)); 3459 3460 memset(skb_push(skb, pad), 0, pad); 3461 3462 head->len += skb->len; 3463 head->data_len += skb->len; 3464 *frag_tail = skb; 3465 3466 out_recalc: 3467 fq->memory_usage += head->truesize - orig_truesize; 3468 if (head->len != orig_len) { 3469 flow->backlog += head->len - orig_len; 3470 tin->backlog_bytes += head->len - orig_len; 3471 } 3472 out: 3473 spin_unlock_bh(&fq->lock); 3474 3475 return ret; 3476 } 3477 3478 /* 3479 * Can be called while the sta lock is held. Anything that can cause packets to 3480 * be generated will cause deadlock! 3481 */ 3482 static ieee80211_tx_result 3483 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata, 3484 struct sta_info *sta, u8 pn_offs, 3485 struct ieee80211_key *key, 3486 struct ieee80211_tx_data *tx) 3487 { 3488 struct sk_buff *skb = tx->skb; 3489 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 3490 struct ieee80211_hdr *hdr = (void *)skb->data; 3491 u8 tid = IEEE80211_NUM_TIDS; 3492 3493 if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) && 3494 ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE) 3495 return TX_DROP; 3496 3497 if (key) 3498 info->control.hw_key = &key->conf; 3499 3500 dev_sw_netstats_tx_add(skb->dev, 1, skb->len); 3501 3502 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3503 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3504 hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid); 3505 } else { 3506 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; 3507 hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number); 3508 sdata->sequence_number += 0x10; 3509 } 3510 3511 if (skb_shinfo(skb)->gso_size) 3512 sta->deflink.tx_stats.msdu[tid] += 3513 DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size); 3514 else 3515 sta->deflink.tx_stats.msdu[tid]++; 3516 3517 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 3518 3519 /* statistics normally done by ieee80211_tx_h_stats (but that 3520 * has to consider fragmentation, so is more complex) 3521 */ 3522 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 3523 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 3524 3525 if (pn_offs) { 3526 u64 pn; 3527 u8 *crypto_hdr = skb->data + pn_offs; 3528 3529 switch (key->conf.cipher) { 3530 case WLAN_CIPHER_SUITE_CCMP: 3531 case WLAN_CIPHER_SUITE_CCMP_256: 3532 case WLAN_CIPHER_SUITE_GCMP: 3533 case WLAN_CIPHER_SUITE_GCMP_256: 3534 pn = atomic64_inc_return(&key->conf.tx_pn); 3535 crypto_hdr[0] = pn; 3536 crypto_hdr[1] = pn >> 8; 3537 crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6); 3538 crypto_hdr[4] = pn >> 16; 3539 crypto_hdr[5] = pn >> 24; 3540 crypto_hdr[6] = pn >> 32; 3541 crypto_hdr[7] = pn >> 40; 3542 break; 3543 } 3544 } 3545 3546 return TX_CONTINUE; 3547 } 3548 3549 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata, 3550 struct sta_info *sta, 3551 struct ieee80211_fast_tx *fast_tx, 3552 struct sk_buff *skb) 3553 { 3554 struct ieee80211_local *local = sdata->local; 3555 u16 ethertype = (skb->data[12] << 8) | skb->data[13]; 3556 int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2); 3557 int hw_headroom = sdata->local->hw.extra_tx_headroom; 3558 struct ethhdr eth; 3559 struct ieee80211_tx_info *info; 3560 struct ieee80211_hdr *hdr = (void *)fast_tx->hdr; 3561 struct ieee80211_tx_data tx; 3562 ieee80211_tx_result r; 3563 struct tid_ampdu_tx *tid_tx = NULL; 3564 u8 tid = IEEE80211_NUM_TIDS; 3565 3566 /* control port protocol needs a lot of special handling */ 3567 if (cpu_to_be16(ethertype) == sdata->control_port_protocol) 3568 return false; 3569 3570 /* only RFC 1042 SNAP */ 3571 if (ethertype < ETH_P_802_3_MIN) 3572 return false; 3573 3574 /* don't handle TX status request here either */ 3575 if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) 3576 return false; 3577 3578 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3579 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3580 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 3581 if (tid_tx) { 3582 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) 3583 return false; 3584 if (tid_tx->timeout) 3585 tid_tx->last_tx = jiffies; 3586 } 3587 } 3588 3589 /* after this point (skb is modified) we cannot return false */ 3590 3591 skb = skb_share_check(skb, GFP_ATOMIC); 3592 if (unlikely(!skb)) 3593 return true; 3594 3595 if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) && 3596 ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb)) 3597 return true; 3598 3599 /* will not be crypto-handled beyond what we do here, so use false 3600 * as the may-encrypt argument for the resize to not account for 3601 * more room than we already have in 'extra_head' 3602 */ 3603 if (unlikely(ieee80211_skb_resize(sdata, skb, 3604 max_t(int, extra_head + hw_headroom - 3605 skb_headroom(skb), 0), 3606 ENCRYPT_NO))) { 3607 kfree_skb(skb); 3608 return true; 3609 } 3610 3611 memcpy(ð, skb->data, ETH_HLEN - 2); 3612 hdr = skb_push(skb, extra_head); 3613 memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len); 3614 memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN); 3615 memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN); 3616 3617 info = IEEE80211_SKB_CB(skb); 3618 memset(info, 0, sizeof(*info)); 3619 info->band = fast_tx->band; 3620 info->control.vif = &sdata->vif; 3621 info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT | 3622 IEEE80211_TX_CTL_DONTFRAG | 3623 (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0); 3624 info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT | 3625 u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 3626 IEEE80211_TX_CTRL_MLO_LINK); 3627 3628 #ifdef CONFIG_MAC80211_DEBUGFS 3629 if (local->force_tx_status) 3630 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 3631 #endif 3632 3633 if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) { 3634 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 3635 *ieee80211_get_qos_ctl(hdr) = tid; 3636 } 3637 3638 __skb_queue_head_init(&tx.skbs); 3639 3640 tx.flags = IEEE80211_TX_UNICAST; 3641 tx.local = local; 3642 tx.sdata = sdata; 3643 tx.sta = sta; 3644 tx.key = fast_tx->key; 3645 3646 if (ieee80211_queue_skb(local, sdata, sta, skb)) 3647 return true; 3648 3649 tx.skb = skb; 3650 r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs, 3651 fast_tx->key, &tx); 3652 tx.skb = NULL; 3653 if (r == TX_DROP) { 3654 kfree_skb(skb); 3655 return true; 3656 } 3657 3658 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 3659 sdata = container_of(sdata->bss, 3660 struct ieee80211_sub_if_data, u.ap); 3661 3662 __skb_queue_tail(&tx.skbs, skb); 3663 ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false); 3664 return true; 3665 } 3666 3667 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 3668 struct ieee80211_txq *txq) 3669 { 3670 struct ieee80211_local *local = hw_to_local(hw); 3671 struct txq_info *txqi = container_of(txq, struct txq_info, txq); 3672 struct ieee80211_hdr *hdr; 3673 struct sk_buff *skb = NULL; 3674 struct fq *fq = &local->fq; 3675 struct fq_tin *tin = &txqi->tin; 3676 struct ieee80211_tx_info *info; 3677 struct ieee80211_tx_data tx; 3678 ieee80211_tx_result r; 3679 struct ieee80211_vif *vif = txq->vif; 3680 3681 WARN_ON_ONCE(softirq_count() == 0); 3682 3683 if (!ieee80211_txq_airtime_check(hw, txq)) 3684 return NULL; 3685 3686 begin: 3687 spin_lock_bh(&fq->lock); 3688 3689 if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) || 3690 test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags)) 3691 goto out; 3692 3693 if (vif->txqs_stopped[txq->ac]) { 3694 set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags); 3695 goto out; 3696 } 3697 3698 /* Make sure fragments stay together. */ 3699 skb = __skb_dequeue(&txqi->frags); 3700 if (unlikely(skb)) { 3701 if (!(IEEE80211_SKB_CB(skb)->control.flags & 3702 IEEE80211_TX_INTCFL_NEED_TXPROCESSING)) 3703 goto out; 3704 IEEE80211_SKB_CB(skb)->control.flags &= 3705 ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING; 3706 } else { 3707 skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func); 3708 } 3709 3710 if (!skb) 3711 goto out; 3712 3713 spin_unlock_bh(&fq->lock); 3714 3715 hdr = (struct ieee80211_hdr *)skb->data; 3716 info = IEEE80211_SKB_CB(skb); 3717 3718 memset(&tx, 0, sizeof(tx)); 3719 __skb_queue_head_init(&tx.skbs); 3720 tx.local = local; 3721 tx.skb = skb; 3722 tx.sdata = vif_to_sdata(info->control.vif); 3723 3724 if (txq->sta) { 3725 tx.sta = container_of(txq->sta, struct sta_info, sta); 3726 /* 3727 * Drop unicast frames to unauthorised stations unless they are 3728 * injected frames or EAPOL frames from the local station. 3729 */ 3730 if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) && 3731 ieee80211_is_data(hdr->frame_control) && 3732 !ieee80211_vif_is_mesh(&tx.sdata->vif) && 3733 tx.sdata->vif.type != NL80211_IFTYPE_OCB && 3734 !is_multicast_ether_addr(hdr->addr1) && 3735 !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) && 3736 (!(info->control.flags & 3737 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) || 3738 !ether_addr_equal(tx.sdata->vif.addr, 3739 hdr->addr2)))) { 3740 I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); 3741 ieee80211_free_txskb(&local->hw, skb); 3742 goto begin; 3743 } 3744 } 3745 3746 /* 3747 * The key can be removed while the packet was queued, so need to call 3748 * this here to get the current key. 3749 */ 3750 r = ieee80211_tx_h_select_key(&tx); 3751 if (r != TX_CONTINUE) { 3752 ieee80211_free_txskb(&local->hw, skb); 3753 goto begin; 3754 } 3755 3756 if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags)) 3757 info->flags |= IEEE80211_TX_CTL_AMPDU; 3758 else 3759 info->flags &= ~IEEE80211_TX_CTL_AMPDU; 3760 3761 if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 3762 if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) { 3763 r = ieee80211_tx_h_rate_ctrl(&tx); 3764 if (r != TX_CONTINUE) { 3765 ieee80211_free_txskb(&local->hw, skb); 3766 goto begin; 3767 } 3768 } 3769 goto encap_out; 3770 } 3771 3772 if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) { 3773 struct sta_info *sta = container_of(txq->sta, struct sta_info, 3774 sta); 3775 u8 pn_offs = 0; 3776 3777 if (tx.key && 3778 (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) 3779 pn_offs = ieee80211_hdrlen(hdr->frame_control); 3780 3781 r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs, 3782 tx.key, &tx); 3783 if (r != TX_CONTINUE) { 3784 ieee80211_free_txskb(&local->hw, skb); 3785 goto begin; 3786 } 3787 } else { 3788 if (invoke_tx_handlers_late(&tx)) 3789 goto begin; 3790 3791 skb = __skb_dequeue(&tx.skbs); 3792 3793 if (!skb_queue_empty(&tx.skbs)) { 3794 spin_lock_bh(&fq->lock); 3795 skb_queue_splice_tail(&tx.skbs, &txqi->frags); 3796 spin_unlock_bh(&fq->lock); 3797 } 3798 } 3799 3800 if (skb_has_frag_list(skb) && 3801 !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) { 3802 if (skb_linearize(skb)) { 3803 ieee80211_free_txskb(&local->hw, skb); 3804 goto begin; 3805 } 3806 } 3807 3808 switch (tx.sdata->vif.type) { 3809 case NL80211_IFTYPE_MONITOR: 3810 if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) { 3811 vif = &tx.sdata->vif; 3812 break; 3813 } 3814 tx.sdata = rcu_dereference(local->monitor_sdata); 3815 if (tx.sdata) { 3816 vif = &tx.sdata->vif; 3817 info->hw_queue = 3818 vif->hw_queue[skb_get_queue_mapping(skb)]; 3819 } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) { 3820 ieee80211_free_txskb(&local->hw, skb); 3821 goto begin; 3822 } else { 3823 vif = NULL; 3824 } 3825 break; 3826 case NL80211_IFTYPE_AP_VLAN: 3827 tx.sdata = container_of(tx.sdata->bss, 3828 struct ieee80211_sub_if_data, u.ap); 3829 fallthrough; 3830 default: 3831 vif = &tx.sdata->vif; 3832 break; 3833 } 3834 3835 encap_out: 3836 IEEE80211_SKB_CB(skb)->control.vif = vif; 3837 3838 if (tx.sta && 3839 wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) { 3840 bool ampdu = txq->ac != IEEE80211_AC_VO; 3841 u32 airtime; 3842 3843 airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta, 3844 skb->len, ampdu); 3845 if (airtime) { 3846 airtime = ieee80211_info_set_tx_time_est(info, airtime); 3847 ieee80211_sta_update_pending_airtime(local, tx.sta, 3848 txq->ac, 3849 airtime, 3850 false); 3851 } 3852 } 3853 3854 return skb; 3855 3856 out: 3857 spin_unlock_bh(&fq->lock); 3858 3859 return skb; 3860 } 3861 EXPORT_SYMBOL(ieee80211_tx_dequeue); 3862 3863 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac) 3864 { 3865 struct airtime_info *air_info = &sta->airtime[ac]; 3866 3867 return air_info->deficit - atomic_read(&air_info->aql_tx_pending); 3868 } 3869 3870 static void 3871 ieee80211_txq_set_active(struct txq_info *txqi) 3872 { 3873 struct sta_info *sta; 3874 3875 if (!txqi->txq.sta) 3876 return; 3877 3878 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3879 sta->airtime[txqi->txq.ac].last_active = (u32)jiffies; 3880 } 3881 3882 static bool 3883 ieee80211_txq_keep_active(struct txq_info *txqi) 3884 { 3885 struct sta_info *sta; 3886 u32 diff; 3887 3888 if (!txqi->txq.sta) 3889 return false; 3890 3891 sta = container_of(txqi->txq.sta, struct sta_info, sta); 3892 if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0) 3893 return false; 3894 3895 diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active; 3896 3897 return diff <= AIRTIME_ACTIVE_DURATION; 3898 } 3899 3900 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) 3901 { 3902 struct ieee80211_local *local = hw_to_local(hw); 3903 struct ieee80211_txq *ret = NULL; 3904 struct txq_info *txqi = NULL, *head = NULL; 3905 bool found_eligible_txq = false; 3906 3907 spin_lock_bh(&local->active_txq_lock[ac]); 3908 3909 if (!local->schedule_round[ac]) 3910 goto out; 3911 3912 begin: 3913 txqi = list_first_entry_or_null(&local->active_txqs[ac], 3914 struct txq_info, 3915 schedule_order); 3916 if (!txqi) 3917 goto out; 3918 3919 if (txqi == head) { 3920 if (!found_eligible_txq) 3921 goto out; 3922 else 3923 found_eligible_txq = false; 3924 } 3925 3926 if (!head) 3927 head = txqi; 3928 3929 if (txqi->txq.sta) { 3930 struct sta_info *sta = container_of(txqi->txq.sta, 3931 struct sta_info, sta); 3932 bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq); 3933 s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac); 3934 3935 if (aql_check) 3936 found_eligible_txq = true; 3937 3938 if (deficit < 0) 3939 sta->airtime[txqi->txq.ac].deficit += 3940 sta->airtime_weight; 3941 3942 if (deficit < 0 || !aql_check) { 3943 list_move_tail(&txqi->schedule_order, 3944 &local->active_txqs[txqi->txq.ac]); 3945 goto begin; 3946 } 3947 } 3948 3949 if (txqi->schedule_round == local->schedule_round[ac]) 3950 goto out; 3951 3952 list_del_init(&txqi->schedule_order); 3953 txqi->schedule_round = local->schedule_round[ac]; 3954 ret = &txqi->txq; 3955 3956 out: 3957 spin_unlock_bh(&local->active_txq_lock[ac]); 3958 return ret; 3959 } 3960 EXPORT_SYMBOL(ieee80211_next_txq); 3961 3962 void __ieee80211_schedule_txq(struct ieee80211_hw *hw, 3963 struct ieee80211_txq *txq, 3964 bool force) 3965 { 3966 struct ieee80211_local *local = hw_to_local(hw); 3967 struct txq_info *txqi = to_txq_info(txq); 3968 bool has_queue; 3969 3970 spin_lock_bh(&local->active_txq_lock[txq->ac]); 3971 3972 has_queue = force || txq_has_queue(txq); 3973 if (list_empty(&txqi->schedule_order) && 3974 (has_queue || ieee80211_txq_keep_active(txqi))) { 3975 /* If airtime accounting is active, always enqueue STAs at the 3976 * head of the list to ensure that they only get moved to the 3977 * back by the airtime DRR scheduler once they have a negative 3978 * deficit. A station that already has a negative deficit will 3979 * get immediately moved to the back of the list on the next 3980 * call to ieee80211_next_txq(). 3981 */ 3982 if (txqi->txq.sta && local->airtime_flags && has_queue && 3983 wiphy_ext_feature_isset(local->hw.wiphy, 3984 NL80211_EXT_FEATURE_AIRTIME_FAIRNESS)) 3985 list_add(&txqi->schedule_order, 3986 &local->active_txqs[txq->ac]); 3987 else 3988 list_add_tail(&txqi->schedule_order, 3989 &local->active_txqs[txq->ac]); 3990 if (has_queue) 3991 ieee80211_txq_set_active(txqi); 3992 } 3993 3994 spin_unlock_bh(&local->active_txq_lock[txq->ac]); 3995 } 3996 EXPORT_SYMBOL(__ieee80211_schedule_txq); 3997 3998 DEFINE_STATIC_KEY_FALSE(aql_disable); 3999 4000 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw, 4001 struct ieee80211_txq *txq) 4002 { 4003 struct sta_info *sta; 4004 struct ieee80211_local *local = hw_to_local(hw); 4005 4006 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4007 return true; 4008 4009 if (static_branch_unlikely(&aql_disable)) 4010 return true; 4011 4012 if (!txq->sta) 4013 return true; 4014 4015 if (unlikely(txq->tid == IEEE80211_NUM_TIDS)) 4016 return true; 4017 4018 sta = container_of(txq->sta, struct sta_info, sta); 4019 if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4020 sta->airtime[txq->ac].aql_limit_low) 4021 return true; 4022 4023 if (atomic_read(&local->aql_total_pending_airtime) < 4024 local->aql_threshold && 4025 atomic_read(&sta->airtime[txq->ac].aql_tx_pending) < 4026 sta->airtime[txq->ac].aql_limit_high) 4027 return true; 4028 4029 return false; 4030 } 4031 EXPORT_SYMBOL(ieee80211_txq_airtime_check); 4032 4033 static bool 4034 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac) 4035 { 4036 unsigned int num_txq = 0; 4037 struct txq_info *txq; 4038 u32 aql_limit; 4039 4040 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) 4041 return true; 4042 4043 list_for_each_entry(txq, &local->active_txqs[ac], schedule_order) 4044 num_txq++; 4045 4046 aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 + 4047 local->aql_txq_limit_high[ac]; 4048 4049 return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit; 4050 } 4051 4052 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw, 4053 struct ieee80211_txq *txq) 4054 { 4055 struct ieee80211_local *local = hw_to_local(hw); 4056 struct txq_info *iter, *tmp, *txqi = to_txq_info(txq); 4057 struct sta_info *sta; 4058 u8 ac = txq->ac; 4059 4060 spin_lock_bh(&local->active_txq_lock[ac]); 4061 4062 if (!txqi->txq.sta) 4063 goto out; 4064 4065 if (list_empty(&txqi->schedule_order)) 4066 goto out; 4067 4068 if (!ieee80211_txq_schedule_airtime_check(local, ac)) 4069 goto out; 4070 4071 list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac], 4072 schedule_order) { 4073 if (iter == txqi) 4074 break; 4075 4076 if (!iter->txq.sta) { 4077 list_move_tail(&iter->schedule_order, 4078 &local->active_txqs[ac]); 4079 continue; 4080 } 4081 sta = container_of(iter->txq.sta, struct sta_info, sta); 4082 if (ieee80211_sta_deficit(sta, ac) < 0) 4083 sta->airtime[ac].deficit += sta->airtime_weight; 4084 list_move_tail(&iter->schedule_order, &local->active_txqs[ac]); 4085 } 4086 4087 sta = container_of(txqi->txq.sta, struct sta_info, sta); 4088 if (sta->airtime[ac].deficit >= 0) 4089 goto out; 4090 4091 sta->airtime[ac].deficit += sta->airtime_weight; 4092 list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]); 4093 spin_unlock_bh(&local->active_txq_lock[ac]); 4094 4095 return false; 4096 out: 4097 if (!list_empty(&txqi->schedule_order)) 4098 list_del_init(&txqi->schedule_order); 4099 spin_unlock_bh(&local->active_txq_lock[ac]); 4100 4101 return true; 4102 } 4103 EXPORT_SYMBOL(ieee80211_txq_may_transmit); 4104 4105 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) 4106 { 4107 struct ieee80211_local *local = hw_to_local(hw); 4108 4109 spin_lock_bh(&local->active_txq_lock[ac]); 4110 4111 if (ieee80211_txq_schedule_airtime_check(local, ac)) { 4112 local->schedule_round[ac]++; 4113 if (!local->schedule_round[ac]) 4114 local->schedule_round[ac]++; 4115 } else { 4116 local->schedule_round[ac] = 0; 4117 } 4118 4119 spin_unlock_bh(&local->active_txq_lock[ac]); 4120 } 4121 EXPORT_SYMBOL(ieee80211_txq_schedule_start); 4122 4123 void __ieee80211_subif_start_xmit(struct sk_buff *skb, 4124 struct net_device *dev, 4125 u32 info_flags, 4126 u32 ctrl_flags, 4127 u64 *cookie) 4128 { 4129 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4130 struct ieee80211_local *local = sdata->local; 4131 struct sta_info *sta; 4132 struct sk_buff *next; 4133 int len = skb->len; 4134 4135 if (unlikely(skb->len < ETH_HLEN)) { 4136 kfree_skb(skb); 4137 return; 4138 } 4139 4140 rcu_read_lock(); 4141 4142 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) 4143 goto out_free; 4144 4145 if (IS_ERR(sta)) 4146 sta = NULL; 4147 4148 if (local->ops->wake_tx_queue) { 4149 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4150 skb_set_queue_mapping(skb, queue); 4151 skb_get_hash(skb); 4152 } 4153 4154 ieee80211_aggr_check(sdata, sta, skb); 4155 4156 sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift); 4157 4158 if (sta) { 4159 struct ieee80211_fast_tx *fast_tx; 4160 4161 fast_tx = rcu_dereference(sta->fast_tx); 4162 4163 if (fast_tx && 4164 ieee80211_xmit_fast(sdata, sta, fast_tx, skb)) 4165 goto out; 4166 } 4167 4168 if (skb_is_gso(skb)) { 4169 struct sk_buff *segs; 4170 4171 segs = skb_gso_segment(skb, 0); 4172 if (IS_ERR(segs)) { 4173 goto out_free; 4174 } else if (segs) { 4175 consume_skb(skb); 4176 skb = segs; 4177 } 4178 } else { 4179 /* we cannot process non-linear frames on this path */ 4180 if (skb_linearize(skb)) 4181 goto out_free; 4182 4183 /* the frame could be fragmented, software-encrypted, and other 4184 * things so we cannot really handle checksum offload with it - 4185 * fix it up in software before we handle anything else. 4186 */ 4187 if (skb->ip_summed == CHECKSUM_PARTIAL) { 4188 skb_set_transport_header(skb, 4189 skb_checksum_start_offset(skb)); 4190 if (skb_checksum_help(skb)) 4191 goto out_free; 4192 } 4193 } 4194 4195 skb_list_walk_safe(skb, skb, next) { 4196 skb_mark_not_on_list(skb); 4197 4198 if (skb->protocol == sdata->control_port_protocol) 4199 ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 4200 4201 skb = ieee80211_build_hdr(sdata, skb, info_flags, 4202 sta, ctrl_flags, cookie); 4203 if (IS_ERR(skb)) { 4204 kfree_skb_list(next); 4205 goto out; 4206 } 4207 4208 dev_sw_netstats_tx_add(dev, 1, skb->len); 4209 4210 ieee80211_xmit(sdata, sta, skb); 4211 } 4212 goto out; 4213 out_free: 4214 kfree_skb(skb); 4215 len = 0; 4216 out: 4217 if (len) 4218 ieee80211_tpt_led_trig_tx(local, len); 4219 rcu_read_unlock(); 4220 } 4221 4222 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta) 4223 { 4224 struct ethhdr *eth; 4225 int err; 4226 4227 err = skb_ensure_writable(skb, ETH_HLEN); 4228 if (unlikely(err)) 4229 return err; 4230 4231 eth = (void *)skb->data; 4232 ether_addr_copy(eth->h_dest, sta->sta.addr); 4233 4234 return 0; 4235 } 4236 4237 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb, 4238 struct net_device *dev) 4239 { 4240 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4241 const struct ethhdr *eth = (void *)skb->data; 4242 const struct vlan_ethhdr *ethvlan = (void *)skb->data; 4243 __be16 ethertype; 4244 4245 switch (sdata->vif.type) { 4246 case NL80211_IFTYPE_AP_VLAN: 4247 if (sdata->u.vlan.sta) 4248 return false; 4249 if (sdata->wdev.use_4addr) 4250 return false; 4251 fallthrough; 4252 case NL80211_IFTYPE_AP: 4253 /* check runtime toggle for this bss */ 4254 if (!sdata->bss->multicast_to_unicast) 4255 return false; 4256 break; 4257 default: 4258 return false; 4259 } 4260 4261 /* multicast to unicast conversion only for some payload */ 4262 ethertype = eth->h_proto; 4263 if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN) 4264 ethertype = ethvlan->h_vlan_encapsulated_proto; 4265 switch (ethertype) { 4266 case htons(ETH_P_ARP): 4267 case htons(ETH_P_IP): 4268 case htons(ETH_P_IPV6): 4269 break; 4270 default: 4271 return false; 4272 } 4273 4274 return true; 4275 } 4276 4277 static void 4278 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev, 4279 struct sk_buff_head *queue) 4280 { 4281 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4282 struct ieee80211_local *local = sdata->local; 4283 const struct ethhdr *eth = (struct ethhdr *)skb->data; 4284 struct sta_info *sta, *first = NULL; 4285 struct sk_buff *cloned_skb; 4286 4287 rcu_read_lock(); 4288 4289 list_for_each_entry_rcu(sta, &local->sta_list, list) { 4290 if (sdata != sta->sdata) 4291 /* AP-VLAN mismatch */ 4292 continue; 4293 if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr))) 4294 /* do not send back to source */ 4295 continue; 4296 if (!first) { 4297 first = sta; 4298 continue; 4299 } 4300 cloned_skb = skb_clone(skb, GFP_ATOMIC); 4301 if (!cloned_skb) 4302 goto multicast; 4303 if (unlikely(ieee80211_change_da(cloned_skb, sta))) { 4304 dev_kfree_skb(cloned_skb); 4305 goto multicast; 4306 } 4307 __skb_queue_tail(queue, cloned_skb); 4308 } 4309 4310 if (likely(first)) { 4311 if (unlikely(ieee80211_change_da(skb, first))) 4312 goto multicast; 4313 __skb_queue_tail(queue, skb); 4314 } else { 4315 /* no STA connected, drop */ 4316 kfree_skb(skb); 4317 skb = NULL; 4318 } 4319 4320 goto out; 4321 multicast: 4322 __skb_queue_purge(queue); 4323 __skb_queue_tail(queue, skb); 4324 out: 4325 rcu_read_unlock(); 4326 } 4327 4328 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata, 4329 struct sk_buff *skb, u32 ctrl_flags, 4330 unsigned int link_id) 4331 { 4332 struct sk_buff *out; 4333 4334 out = skb_copy(skb, GFP_ATOMIC); 4335 if (!out) 4336 return; 4337 4338 ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK); 4339 __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL); 4340 } 4341 4342 static void ieee80211_mlo_multicast_tx(struct net_device *dev, 4343 struct sk_buff *skb) 4344 { 4345 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4346 unsigned long links = sdata->vif.valid_links; 4347 unsigned int link; 4348 u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; 4349 4350 if (hweight16(links) == 1) { 4351 ctrl_flags |= u32_encode_bits(ffs(links) - 1, 4352 IEEE80211_TX_CTRL_MLO_LINK); 4353 4354 __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags, 4355 NULL); 4356 return; 4357 } 4358 4359 for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) { 4360 ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link); 4361 ctrl_flags = 0; 4362 } 4363 kfree_skb(skb); 4364 } 4365 4366 /** 4367 * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs 4368 * @skb: packet to be sent 4369 * @dev: incoming interface 4370 * 4371 * On failure skb will be freed. 4372 */ 4373 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, 4374 struct net_device *dev) 4375 { 4376 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4377 const struct ethhdr *eth = (void *)skb->data; 4378 4379 if (likely(!is_multicast_ether_addr(eth->h_dest))) 4380 goto normal; 4381 4382 if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) { 4383 struct sk_buff_head queue; 4384 4385 __skb_queue_head_init(&queue); 4386 ieee80211_convert_to_unicast(skb, dev, &queue); 4387 while ((skb = __skb_dequeue(&queue))) 4388 __ieee80211_subif_start_xmit(skb, dev, 0, 4389 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4390 NULL); 4391 } else if (sdata->vif.valid_links && 4392 sdata->vif.type == NL80211_IFTYPE_AP && 4393 !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) { 4394 ieee80211_mlo_multicast_tx(dev, skb); 4395 } else { 4396 normal: 4397 __ieee80211_subif_start_xmit(skb, dev, 0, 4398 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4399 NULL); 4400 } 4401 4402 return NETDEV_TX_OK; 4403 } 4404 4405 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata, 4406 struct sk_buff *skb, struct sta_info *sta, 4407 bool txpending) 4408 { 4409 struct ieee80211_local *local = sdata->local; 4410 struct ieee80211_tx_control control = {}; 4411 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4412 struct ieee80211_sta *pubsta = NULL; 4413 unsigned long flags; 4414 int q = info->hw_queue; 4415 4416 if (sta) 4417 sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift); 4418 4419 ieee80211_tpt_led_trig_tx(local, skb->len); 4420 4421 if (ieee80211_queue_skb(local, sdata, sta, skb)) 4422 return true; 4423 4424 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4425 4426 if (local->queue_stop_reasons[q] || 4427 (!txpending && !skb_queue_empty(&local->pending[q]))) { 4428 if (txpending) 4429 skb_queue_head(&local->pending[q], skb); 4430 else 4431 skb_queue_tail(&local->pending[q], skb); 4432 4433 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4434 4435 return false; 4436 } 4437 4438 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4439 4440 if (sta && sta->uploaded) 4441 pubsta = &sta->sta; 4442 4443 control.sta = pubsta; 4444 4445 drv_tx(local, &control, skb); 4446 4447 return true; 4448 } 4449 4450 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata, 4451 struct net_device *dev, struct sta_info *sta, 4452 struct ieee80211_key *key, struct sk_buff *skb) 4453 { 4454 struct ieee80211_tx_info *info; 4455 struct ieee80211_local *local = sdata->local; 4456 struct tid_ampdu_tx *tid_tx; 4457 u8 tid; 4458 4459 if (local->ops->wake_tx_queue) { 4460 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 4461 skb_set_queue_mapping(skb, queue); 4462 skb_get_hash(skb); 4463 } 4464 4465 if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) && 4466 test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) 4467 goto out_free; 4468 4469 skb = skb_share_check(skb, GFP_ATOMIC); 4470 if (unlikely(!skb)) 4471 return; 4472 4473 info = IEEE80211_SKB_CB(skb); 4474 memset(info, 0, sizeof(*info)); 4475 4476 ieee80211_aggr_check(sdata, sta, skb); 4477 4478 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK; 4479 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); 4480 if (tid_tx) { 4481 if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { 4482 /* fall back to non-offload slow path */ 4483 __ieee80211_subif_start_xmit(skb, dev, 0, 4484 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, 4485 NULL); 4486 return; 4487 } 4488 4489 info->flags |= IEEE80211_TX_CTL_AMPDU; 4490 if (tid_tx->timeout) 4491 tid_tx->last_tx = jiffies; 4492 } 4493 4494 if (unlikely(skb->sk && 4495 skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) 4496 info->ack_frame_id = ieee80211_store_ack_skb(local, skb, 4497 &info->flags, NULL); 4498 4499 info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; 4500 4501 dev_sw_netstats_tx_add(dev, 1, skb->len); 4502 4503 sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len; 4504 sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++; 4505 4506 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 4507 sdata = container_of(sdata->bss, 4508 struct ieee80211_sub_if_data, u.ap); 4509 4510 info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP; 4511 info->control.vif = &sdata->vif; 4512 4513 if (key) 4514 info->control.hw_key = &key->conf; 4515 4516 ieee80211_tx_8023(sdata, skb, sta, false); 4517 4518 return; 4519 4520 out_free: 4521 kfree_skb(skb); 4522 } 4523 4524 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, 4525 struct net_device *dev) 4526 { 4527 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 4528 struct ethhdr *ehdr = (struct ethhdr *)skb->data; 4529 struct ieee80211_key *key; 4530 struct sta_info *sta; 4531 4532 if (unlikely(skb->len < ETH_HLEN)) { 4533 kfree_skb(skb); 4534 return NETDEV_TX_OK; 4535 } 4536 4537 rcu_read_lock(); 4538 4539 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4540 kfree_skb(skb); 4541 goto out; 4542 } 4543 4544 if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded || 4545 !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || 4546 sdata->control_port_protocol == ehdr->h_proto)) 4547 goto skip_offload; 4548 4549 key = rcu_dereference(sta->ptk[sta->ptk_idx]); 4550 if (!key) 4551 key = rcu_dereference(sdata->default_unicast_key); 4552 4553 if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) || 4554 key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)) 4555 goto skip_offload; 4556 4557 ieee80211_8023_xmit(sdata, dev, sta, key, skb); 4558 goto out; 4559 4560 skip_offload: 4561 ieee80211_subif_start_xmit(skb, dev); 4562 out: 4563 rcu_read_unlock(); 4564 4565 return NETDEV_TX_OK; 4566 } 4567 4568 struct sk_buff * 4569 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata, 4570 struct sk_buff *skb, u32 info_flags) 4571 { 4572 struct ieee80211_hdr *hdr; 4573 struct ieee80211_tx_data tx = { 4574 .local = sdata->local, 4575 .sdata = sdata, 4576 }; 4577 struct sta_info *sta; 4578 4579 rcu_read_lock(); 4580 4581 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4582 kfree_skb(skb); 4583 skb = ERR_PTR(-EINVAL); 4584 goto out; 4585 } 4586 4587 skb = ieee80211_build_hdr(sdata, skb, info_flags, sta, 4588 IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL); 4589 if (IS_ERR(skb)) 4590 goto out; 4591 4592 hdr = (void *)skb->data; 4593 tx.sta = sta_info_get(sdata, hdr->addr1); 4594 tx.skb = skb; 4595 4596 if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) { 4597 rcu_read_unlock(); 4598 kfree_skb(skb); 4599 return ERR_PTR(-EINVAL); 4600 } 4601 4602 out: 4603 rcu_read_unlock(); 4604 return skb; 4605 } 4606 4607 /* 4608 * ieee80211_clear_tx_pending may not be called in a context where 4609 * it is possible that it packets could come in again. 4610 */ 4611 void ieee80211_clear_tx_pending(struct ieee80211_local *local) 4612 { 4613 struct sk_buff *skb; 4614 int i; 4615 4616 for (i = 0; i < local->hw.queues; i++) { 4617 while ((skb = skb_dequeue(&local->pending[i])) != NULL) 4618 ieee80211_free_txskb(&local->hw, skb); 4619 } 4620 } 4621 4622 /* 4623 * Returns false if the frame couldn't be transmitted but was queued instead, 4624 * which in this case means re-queued -- take as an indication to stop sending 4625 * more pending frames. 4626 */ 4627 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, 4628 struct sk_buff *skb) 4629 { 4630 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4631 struct ieee80211_sub_if_data *sdata; 4632 struct sta_info *sta; 4633 struct ieee80211_hdr *hdr; 4634 bool result; 4635 struct ieee80211_chanctx_conf *chanctx_conf; 4636 4637 sdata = vif_to_sdata(info->control.vif); 4638 4639 if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) { 4640 /* update band only for non-MLD */ 4641 if (!sdata->vif.valid_links) { 4642 chanctx_conf = 4643 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 4644 if (unlikely(!chanctx_conf)) { 4645 dev_kfree_skb(skb); 4646 return true; 4647 } 4648 info->band = chanctx_conf->def.chan->band; 4649 } 4650 result = ieee80211_tx(sdata, NULL, skb, true); 4651 } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) { 4652 if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) { 4653 dev_kfree_skb(skb); 4654 return true; 4655 } 4656 4657 if (IS_ERR(sta) || (sta && !sta->uploaded)) 4658 sta = NULL; 4659 4660 result = ieee80211_tx_8023(sdata, skb, sta, true); 4661 } else { 4662 struct sk_buff_head skbs; 4663 4664 __skb_queue_head_init(&skbs); 4665 __skb_queue_tail(&skbs, skb); 4666 4667 hdr = (struct ieee80211_hdr *)skb->data; 4668 sta = sta_info_get(sdata, hdr->addr1); 4669 4670 result = __ieee80211_tx(local, &skbs, sta, true); 4671 } 4672 4673 return result; 4674 } 4675 4676 /* 4677 * Transmit all pending packets. Called from tasklet. 4678 */ 4679 void ieee80211_tx_pending(struct tasklet_struct *t) 4680 { 4681 struct ieee80211_local *local = from_tasklet(local, t, 4682 tx_pending_tasklet); 4683 unsigned long flags; 4684 int i; 4685 bool txok; 4686 4687 rcu_read_lock(); 4688 4689 spin_lock_irqsave(&local->queue_stop_reason_lock, flags); 4690 for (i = 0; i < local->hw.queues; i++) { 4691 /* 4692 * If queue is stopped by something other than due to pending 4693 * frames, or we have no pending frames, proceed to next queue. 4694 */ 4695 if (local->queue_stop_reasons[i] || 4696 skb_queue_empty(&local->pending[i])) 4697 continue; 4698 4699 while (!skb_queue_empty(&local->pending[i])) { 4700 struct sk_buff *skb = __skb_dequeue(&local->pending[i]); 4701 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 4702 4703 if (WARN_ON(!info->control.vif)) { 4704 ieee80211_free_txskb(&local->hw, skb); 4705 continue; 4706 } 4707 4708 spin_unlock_irqrestore(&local->queue_stop_reason_lock, 4709 flags); 4710 4711 txok = ieee80211_tx_pending_skb(local, skb); 4712 spin_lock_irqsave(&local->queue_stop_reason_lock, 4713 flags); 4714 if (!txok) 4715 break; 4716 } 4717 4718 if (skb_queue_empty(&local->pending[i])) 4719 ieee80211_propagate_queue_wake(local, i); 4720 } 4721 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); 4722 4723 rcu_read_unlock(); 4724 } 4725 4726 /* functions for drivers to get certain frames */ 4727 4728 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4729 struct ieee80211_link_data *link, 4730 struct ps_data *ps, struct sk_buff *skb, 4731 bool is_template) 4732 { 4733 u8 *pos, *tim; 4734 int aid0 = 0; 4735 int i, have_bits = 0, n1, n2; 4736 struct ieee80211_bss_conf *link_conf = link->conf; 4737 4738 /* Generate bitmap for TIM only if there are any STAs in power save 4739 * mode. */ 4740 if (atomic_read(&ps->num_sta_ps) > 0) 4741 /* in the hope that this is faster than 4742 * checking byte-for-byte */ 4743 have_bits = !bitmap_empty((unsigned long *)ps->tim, 4744 IEEE80211_MAX_AID+1); 4745 if (!is_template) { 4746 if (ps->dtim_count == 0) 4747 ps->dtim_count = link_conf->dtim_period - 1; 4748 else 4749 ps->dtim_count--; 4750 } 4751 4752 tim = pos = skb_put(skb, 6); 4753 *pos++ = WLAN_EID_TIM; 4754 *pos++ = 4; 4755 *pos++ = ps->dtim_count; 4756 *pos++ = link_conf->dtim_period; 4757 4758 if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) 4759 aid0 = 1; 4760 4761 ps->dtim_bc_mc = aid0 == 1; 4762 4763 if (have_bits) { 4764 /* Find largest even number N1 so that bits numbered 1 through 4765 * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits 4766 * (N2 + 1) x 8 through 2007 are 0. */ 4767 n1 = 0; 4768 for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { 4769 if (ps->tim[i]) { 4770 n1 = i & 0xfe; 4771 break; 4772 } 4773 } 4774 n2 = n1; 4775 for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { 4776 if (ps->tim[i]) { 4777 n2 = i; 4778 break; 4779 } 4780 } 4781 4782 /* Bitmap control */ 4783 *pos++ = n1 | aid0; 4784 /* Part Virt Bitmap */ 4785 skb_put(skb, n2 - n1); 4786 memcpy(pos, ps->tim + n1, n2 - n1 + 1); 4787 4788 tim[1] = n2 - n1 + 4; 4789 } else { 4790 *pos++ = aid0; /* Bitmap control */ 4791 *pos++ = 0; /* Part Virt Bitmap */ 4792 } 4793 } 4794 4795 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, 4796 struct ieee80211_link_data *link, 4797 struct ps_data *ps, struct sk_buff *skb, 4798 bool is_template) 4799 { 4800 struct ieee80211_local *local = sdata->local; 4801 4802 /* 4803 * Not very nice, but we want to allow the driver to call 4804 * ieee80211_beacon_get() as a response to the set_tim() 4805 * callback. That, however, is already invoked under the 4806 * sta_lock to guarantee consistent and race-free update 4807 * of the tim bitmap in mac80211 and the driver. 4808 */ 4809 if (local->tim_in_locked_section) { 4810 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4811 } else { 4812 spin_lock_bh(&local->tim_lock); 4813 __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template); 4814 spin_unlock_bh(&local->tim_lock); 4815 } 4816 4817 return 0; 4818 } 4819 4820 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata, 4821 struct beacon_data *beacon, 4822 struct ieee80211_link_data *link) 4823 { 4824 u8 *beacon_data, count, max_count = 1; 4825 struct probe_resp *resp; 4826 size_t beacon_data_len; 4827 u16 *bcn_offsets; 4828 int i; 4829 4830 switch (sdata->vif.type) { 4831 case NL80211_IFTYPE_AP: 4832 beacon_data = beacon->tail; 4833 beacon_data_len = beacon->tail_len; 4834 break; 4835 case NL80211_IFTYPE_ADHOC: 4836 beacon_data = beacon->head; 4837 beacon_data_len = beacon->head_len; 4838 break; 4839 case NL80211_IFTYPE_MESH_POINT: 4840 beacon_data = beacon->head; 4841 beacon_data_len = beacon->head_len; 4842 break; 4843 default: 4844 return; 4845 } 4846 4847 resp = rcu_dereference(link->u.ap.probe_resp); 4848 4849 bcn_offsets = beacon->cntdwn_counter_offsets; 4850 count = beacon->cntdwn_current_counter; 4851 if (link->conf->csa_active) 4852 max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM; 4853 4854 for (i = 0; i < max_count; ++i) { 4855 if (bcn_offsets[i]) { 4856 if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len)) 4857 return; 4858 beacon_data[bcn_offsets[i]] = count; 4859 } 4860 4861 if (sdata->vif.type == NL80211_IFTYPE_AP && resp) { 4862 u16 *resp_offsets = resp->cntdwn_counter_offsets; 4863 4864 resp->data[resp_offsets[i]] = count; 4865 } 4866 } 4867 } 4868 4869 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon) 4870 { 4871 beacon->cntdwn_current_counter--; 4872 4873 /* the counter should never reach 0 */ 4874 WARN_ON_ONCE(!beacon->cntdwn_current_counter); 4875 4876 return beacon->cntdwn_current_counter; 4877 } 4878 4879 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif) 4880 { 4881 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4882 struct beacon_data *beacon = NULL; 4883 u8 count = 0; 4884 4885 rcu_read_lock(); 4886 4887 if (sdata->vif.type == NL80211_IFTYPE_AP) 4888 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4889 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4890 beacon = rcu_dereference(sdata->u.ibss.presp); 4891 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4892 beacon = rcu_dereference(sdata->u.mesh.beacon); 4893 4894 if (!beacon) 4895 goto unlock; 4896 4897 count = __ieee80211_beacon_update_cntdwn(beacon); 4898 4899 unlock: 4900 rcu_read_unlock(); 4901 return count; 4902 } 4903 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn); 4904 4905 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter) 4906 { 4907 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4908 struct beacon_data *beacon = NULL; 4909 4910 rcu_read_lock(); 4911 4912 if (sdata->vif.type == NL80211_IFTYPE_AP) 4913 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4914 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 4915 beacon = rcu_dereference(sdata->u.ibss.presp); 4916 else if (ieee80211_vif_is_mesh(&sdata->vif)) 4917 beacon = rcu_dereference(sdata->u.mesh.beacon); 4918 4919 if (!beacon) 4920 goto unlock; 4921 4922 if (counter < beacon->cntdwn_current_counter) 4923 beacon->cntdwn_current_counter = counter; 4924 4925 unlock: 4926 rcu_read_unlock(); 4927 } 4928 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn); 4929 4930 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif) 4931 { 4932 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 4933 struct beacon_data *beacon = NULL; 4934 u8 *beacon_data; 4935 size_t beacon_data_len; 4936 int ret = false; 4937 4938 if (!ieee80211_sdata_running(sdata)) 4939 return false; 4940 4941 rcu_read_lock(); 4942 if (vif->type == NL80211_IFTYPE_AP) { 4943 beacon = rcu_dereference(sdata->deflink.u.ap.beacon); 4944 if (WARN_ON(!beacon || !beacon->tail)) 4945 goto out; 4946 beacon_data = beacon->tail; 4947 beacon_data_len = beacon->tail_len; 4948 } else if (vif->type == NL80211_IFTYPE_ADHOC) { 4949 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 4950 4951 beacon = rcu_dereference(ifibss->presp); 4952 if (!beacon) 4953 goto out; 4954 4955 beacon_data = beacon->head; 4956 beacon_data_len = beacon->head_len; 4957 } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { 4958 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 4959 4960 beacon = rcu_dereference(ifmsh->beacon); 4961 if (!beacon) 4962 goto out; 4963 4964 beacon_data = beacon->head; 4965 beacon_data_len = beacon->head_len; 4966 } else { 4967 WARN_ON(1); 4968 goto out; 4969 } 4970 4971 if (!beacon->cntdwn_counter_offsets[0]) 4972 goto out; 4973 4974 if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len)) 4975 goto out; 4976 4977 if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1) 4978 ret = true; 4979 4980 out: 4981 rcu_read_unlock(); 4982 4983 return ret; 4984 } 4985 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete); 4986 4987 static int ieee80211_beacon_protect(struct sk_buff *skb, 4988 struct ieee80211_local *local, 4989 struct ieee80211_sub_if_data *sdata, 4990 struct ieee80211_link_data *link) 4991 { 4992 ieee80211_tx_result res; 4993 struct ieee80211_tx_data tx; 4994 struct sk_buff *check_skb; 4995 4996 memset(&tx, 0, sizeof(tx)); 4997 tx.key = rcu_dereference(link->default_beacon_key); 4998 if (!tx.key) 4999 return 0; 5000 tx.local = local; 5001 tx.sdata = sdata; 5002 __skb_queue_head_init(&tx.skbs); 5003 __skb_queue_tail(&tx.skbs, skb); 5004 res = ieee80211_tx_h_encrypt(&tx); 5005 check_skb = __skb_dequeue(&tx.skbs); 5006 /* we may crash after this, but it'd be a bug in crypto */ 5007 WARN_ON(check_skb != skb); 5008 if (WARN_ON_ONCE(res != TX_CONTINUE)) 5009 return -EINVAL; 5010 5011 return 0; 5012 } 5013 5014 static void 5015 ieee80211_beacon_get_finish(struct ieee80211_hw *hw, 5016 struct ieee80211_vif *vif, 5017 struct ieee80211_link_data *link, 5018 struct ieee80211_mutable_offsets *offs, 5019 struct beacon_data *beacon, 5020 struct sk_buff *skb, 5021 struct ieee80211_chanctx_conf *chanctx_conf, 5022 u16 csa_off_base) 5023 { 5024 struct ieee80211_local *local = hw_to_local(hw); 5025 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5026 struct ieee80211_tx_info *info; 5027 enum nl80211_band band; 5028 struct ieee80211_tx_rate_control txrc; 5029 5030 /* CSA offsets */ 5031 if (offs && beacon) { 5032 u16 i; 5033 5034 for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) { 5035 u16 csa_off = beacon->cntdwn_counter_offsets[i]; 5036 5037 if (!csa_off) 5038 continue; 5039 5040 offs->cntdwn_counter_offs[i] = csa_off_base + csa_off; 5041 } 5042 } 5043 5044 band = chanctx_conf->def.chan->band; 5045 info = IEEE80211_SKB_CB(skb); 5046 info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5047 info->flags |= IEEE80211_TX_CTL_NO_ACK; 5048 info->band = band; 5049 5050 memset(&txrc, 0, sizeof(txrc)); 5051 txrc.hw = hw; 5052 txrc.sband = local->hw.wiphy->bands[band]; 5053 txrc.bss_conf = link->conf; 5054 txrc.skb = skb; 5055 txrc.reported_rate.idx = -1; 5056 if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band]) 5057 txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band]; 5058 else 5059 txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; 5060 txrc.bss = true; 5061 rate_control_get_rate(sdata, NULL, &txrc); 5062 5063 info->control.vif = vif; 5064 info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | 5065 IEEE80211_TX_CTL_ASSIGN_SEQ | 5066 IEEE80211_TX_CTL_FIRST_FRAGMENT; 5067 } 5068 5069 static void 5070 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon) 5071 { 5072 int i; 5073 5074 if (!beacon->mbssid_ies) 5075 return; 5076 5077 for (i = 0; i < beacon->mbssid_ies->cnt; i++) 5078 skb_put_data(skb, beacon->mbssid_ies->elem[i].data, 5079 beacon->mbssid_ies->elem[i].len); 5080 } 5081 5082 static struct sk_buff * 5083 ieee80211_beacon_get_ap(struct ieee80211_hw *hw, 5084 struct ieee80211_vif *vif, 5085 struct ieee80211_link_data *link, 5086 struct ieee80211_mutable_offsets *offs, 5087 bool is_template, 5088 struct beacon_data *beacon, 5089 struct ieee80211_chanctx_conf *chanctx_conf) 5090 { 5091 struct ieee80211_local *local = hw_to_local(hw); 5092 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5093 struct ieee80211_if_ap *ap = &sdata->u.ap; 5094 struct sk_buff *skb = NULL; 5095 u16 csa_off_base = 0; 5096 int mbssid_len; 5097 5098 if (beacon->cntdwn_counter_offsets[0]) { 5099 if (!is_template) 5100 ieee80211_beacon_update_cntdwn(vif); 5101 5102 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5103 } 5104 5105 /* headroom, head length, 5106 * tail length, maximum TIM length and multiple BSSID length 5107 */ 5108 mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies); 5109 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5110 beacon->tail_len + 256 + 5111 local->hw.extra_beacon_tailroom + mbssid_len); 5112 if (!skb) 5113 return NULL; 5114 5115 skb_reserve(skb, local->tx_headroom); 5116 skb_put_data(skb, beacon->head, beacon->head_len); 5117 5118 ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template); 5119 5120 if (offs) { 5121 offs->tim_offset = beacon->head_len; 5122 offs->tim_length = skb->len - beacon->head_len; 5123 offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0]; 5124 5125 if (mbssid_len) { 5126 ieee80211_beacon_add_mbssid(skb, beacon); 5127 offs->mbssid_off = skb->len - mbssid_len; 5128 } 5129 5130 /* for AP the csa offsets are from tail */ 5131 csa_off_base = skb->len; 5132 } 5133 5134 if (beacon->tail) 5135 skb_put_data(skb, beacon->tail, beacon->tail_len); 5136 5137 if (ieee80211_beacon_protect(skb, local, sdata, link) < 0) 5138 return NULL; 5139 5140 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5141 chanctx_conf, csa_off_base); 5142 return skb; 5143 } 5144 5145 static struct sk_buff * 5146 __ieee80211_beacon_get(struct ieee80211_hw *hw, 5147 struct ieee80211_vif *vif, 5148 struct ieee80211_mutable_offsets *offs, 5149 bool is_template, 5150 unsigned int link_id) 5151 { 5152 struct ieee80211_local *local = hw_to_local(hw); 5153 struct beacon_data *beacon = NULL; 5154 struct sk_buff *skb = NULL; 5155 struct ieee80211_sub_if_data *sdata = NULL; 5156 struct ieee80211_chanctx_conf *chanctx_conf; 5157 struct ieee80211_link_data *link; 5158 5159 rcu_read_lock(); 5160 5161 sdata = vif_to_sdata(vif); 5162 link = rcu_dereference(sdata->link[link_id]); 5163 if (!link) 5164 goto out; 5165 chanctx_conf = 5166 rcu_dereference(link->conf->chanctx_conf); 5167 5168 if (!ieee80211_sdata_running(sdata) || !chanctx_conf) 5169 goto out; 5170 5171 if (offs) 5172 memset(offs, 0, sizeof(*offs)); 5173 5174 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5175 beacon = rcu_dereference(link->u.ap.beacon); 5176 if (!beacon) 5177 goto out; 5178 5179 skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template, 5180 beacon, chanctx_conf); 5181 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { 5182 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 5183 struct ieee80211_hdr *hdr; 5184 5185 beacon = rcu_dereference(ifibss->presp); 5186 if (!beacon) 5187 goto out; 5188 5189 if (beacon->cntdwn_counter_offsets[0]) { 5190 if (!is_template) 5191 __ieee80211_beacon_update_cntdwn(beacon); 5192 5193 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5194 } 5195 5196 skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + 5197 local->hw.extra_beacon_tailroom); 5198 if (!skb) 5199 goto out; 5200 skb_reserve(skb, local->tx_headroom); 5201 skb_put_data(skb, beacon->head, beacon->head_len); 5202 5203 hdr = (struct ieee80211_hdr *) skb->data; 5204 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5205 IEEE80211_STYPE_BEACON); 5206 5207 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5208 chanctx_conf, 0); 5209 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5210 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; 5211 5212 beacon = rcu_dereference(ifmsh->beacon); 5213 if (!beacon) 5214 goto out; 5215 5216 if (beacon->cntdwn_counter_offsets[0]) { 5217 if (!is_template) 5218 /* TODO: For mesh csa_counter is in TU, so 5219 * decrementing it by one isn't correct, but 5220 * for now we leave it consistent with overall 5221 * mac80211's behavior. 5222 */ 5223 __ieee80211_beacon_update_cntdwn(beacon); 5224 5225 ieee80211_set_beacon_cntdwn(sdata, beacon, link); 5226 } 5227 5228 if (ifmsh->sync_ops) 5229 ifmsh->sync_ops->adjust_tsf(sdata, beacon); 5230 5231 skb = dev_alloc_skb(local->tx_headroom + 5232 beacon->head_len + 5233 256 + /* TIM IE */ 5234 beacon->tail_len + 5235 local->hw.extra_beacon_tailroom); 5236 if (!skb) 5237 goto out; 5238 skb_reserve(skb, local->tx_headroom); 5239 skb_put_data(skb, beacon->head, beacon->head_len); 5240 ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb, 5241 is_template); 5242 5243 if (offs) { 5244 offs->tim_offset = beacon->head_len; 5245 offs->tim_length = skb->len - beacon->head_len; 5246 } 5247 5248 skb_put_data(skb, beacon->tail, beacon->tail_len); 5249 ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb, 5250 chanctx_conf, 0); 5251 } else { 5252 WARN_ON(1); 5253 goto out; 5254 } 5255 5256 out: 5257 rcu_read_unlock(); 5258 return skb; 5259 5260 } 5261 5262 struct sk_buff * 5263 ieee80211_beacon_get_template(struct ieee80211_hw *hw, 5264 struct ieee80211_vif *vif, 5265 struct ieee80211_mutable_offsets *offs, 5266 unsigned int link_id) 5267 { 5268 return __ieee80211_beacon_get(hw, vif, offs, true, link_id); 5269 } 5270 EXPORT_SYMBOL(ieee80211_beacon_get_template); 5271 5272 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, 5273 struct ieee80211_vif *vif, 5274 u16 *tim_offset, u16 *tim_length, 5275 unsigned int link_id) 5276 { 5277 struct ieee80211_mutable_offsets offs = {}; 5278 struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false, 5279 link_id); 5280 struct sk_buff *copy; 5281 int shift; 5282 5283 if (!bcn) 5284 return bcn; 5285 5286 if (tim_offset) 5287 *tim_offset = offs.tim_offset; 5288 5289 if (tim_length) 5290 *tim_length = offs.tim_length; 5291 5292 if (ieee80211_hw_check(hw, BEACON_TX_STATUS) || 5293 !hw_to_local(hw)->monitors) 5294 return bcn; 5295 5296 /* send a copy to monitor interfaces */ 5297 copy = skb_copy(bcn, GFP_ATOMIC); 5298 if (!copy) 5299 return bcn; 5300 5301 shift = ieee80211_vif_get_shift(vif); 5302 ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL); 5303 5304 return bcn; 5305 } 5306 EXPORT_SYMBOL(ieee80211_beacon_get_tim); 5307 5308 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, 5309 struct ieee80211_vif *vif) 5310 { 5311 struct sk_buff *skb = NULL; 5312 struct probe_resp *presp = NULL; 5313 struct ieee80211_hdr *hdr; 5314 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5315 5316 if (sdata->vif.type != NL80211_IFTYPE_AP) 5317 return NULL; 5318 5319 rcu_read_lock(); 5320 presp = rcu_dereference(sdata->deflink.u.ap.probe_resp); 5321 if (!presp) 5322 goto out; 5323 5324 skb = dev_alloc_skb(presp->len); 5325 if (!skb) 5326 goto out; 5327 5328 skb_put_data(skb, presp->data, presp->len); 5329 5330 hdr = (struct ieee80211_hdr *) skb->data; 5331 memset(hdr->addr1, 0, sizeof(hdr->addr1)); 5332 5333 out: 5334 rcu_read_unlock(); 5335 return skb; 5336 } 5337 EXPORT_SYMBOL(ieee80211_proberesp_get); 5338 5339 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw, 5340 struct ieee80211_vif *vif) 5341 { 5342 struct sk_buff *skb = NULL; 5343 struct fils_discovery_data *tmpl = NULL; 5344 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5345 5346 if (sdata->vif.type != NL80211_IFTYPE_AP) 5347 return NULL; 5348 5349 rcu_read_lock(); 5350 tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery); 5351 if (!tmpl) { 5352 rcu_read_unlock(); 5353 return NULL; 5354 } 5355 5356 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5357 if (skb) { 5358 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5359 skb_put_data(skb, tmpl->data, tmpl->len); 5360 } 5361 5362 rcu_read_unlock(); 5363 return skb; 5364 } 5365 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl); 5366 5367 struct sk_buff * 5368 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw, 5369 struct ieee80211_vif *vif) 5370 { 5371 struct sk_buff *skb = NULL; 5372 struct unsol_bcast_probe_resp_data *tmpl = NULL; 5373 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 5374 5375 if (sdata->vif.type != NL80211_IFTYPE_AP) 5376 return NULL; 5377 5378 rcu_read_lock(); 5379 tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp); 5380 if (!tmpl) { 5381 rcu_read_unlock(); 5382 return NULL; 5383 } 5384 5385 skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len); 5386 if (skb) { 5387 skb_reserve(skb, sdata->local->hw.extra_tx_headroom); 5388 skb_put_data(skb, tmpl->data, tmpl->len); 5389 } 5390 5391 rcu_read_unlock(); 5392 return skb; 5393 } 5394 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl); 5395 5396 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, 5397 struct ieee80211_vif *vif) 5398 { 5399 struct ieee80211_sub_if_data *sdata; 5400 struct ieee80211_pspoll *pspoll; 5401 struct ieee80211_local *local; 5402 struct sk_buff *skb; 5403 5404 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5405 return NULL; 5406 5407 sdata = vif_to_sdata(vif); 5408 local = sdata->local; 5409 5410 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); 5411 if (!skb) 5412 return NULL; 5413 5414 skb_reserve(skb, local->hw.extra_tx_headroom); 5415 5416 pspoll = skb_put_zero(skb, sizeof(*pspoll)); 5417 pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | 5418 IEEE80211_STYPE_PSPOLL); 5419 pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid); 5420 5421 /* aid in PS-Poll has its two MSBs each set to 1 */ 5422 pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); 5423 5424 memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5425 memcpy(pspoll->ta, vif->addr, ETH_ALEN); 5426 5427 return skb; 5428 } 5429 EXPORT_SYMBOL(ieee80211_pspoll_get); 5430 5431 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, 5432 struct ieee80211_vif *vif, 5433 bool qos_ok) 5434 { 5435 struct ieee80211_hdr_3addr *nullfunc; 5436 struct ieee80211_sub_if_data *sdata; 5437 struct ieee80211_local *local; 5438 struct sk_buff *skb; 5439 bool qos = false; 5440 5441 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 5442 return NULL; 5443 5444 sdata = vif_to_sdata(vif); 5445 local = sdata->local; 5446 5447 if (qos_ok) { 5448 struct sta_info *sta; 5449 5450 rcu_read_lock(); 5451 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid); 5452 qos = sta && sta->sta.wme; 5453 rcu_read_unlock(); 5454 } 5455 5456 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5457 sizeof(*nullfunc) + 2); 5458 if (!skb) 5459 return NULL; 5460 5461 skb_reserve(skb, local->hw.extra_tx_headroom); 5462 5463 nullfunc = skb_put_zero(skb, sizeof(*nullfunc)); 5464 nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | 5465 IEEE80211_STYPE_NULLFUNC | 5466 IEEE80211_FCTL_TODS); 5467 if (qos) { 5468 __le16 qoshdr = cpu_to_le16(7); 5469 5470 BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC | 5471 IEEE80211_STYPE_NULLFUNC) != 5472 IEEE80211_STYPE_QOS_NULLFUNC); 5473 nullfunc->frame_control |= 5474 cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC); 5475 skb->priority = 7; 5476 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 5477 skb_put_data(skb, &qoshdr, sizeof(qoshdr)); 5478 } 5479 5480 memcpy(nullfunc->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5481 memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); 5482 memcpy(nullfunc->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN); 5483 5484 return skb; 5485 } 5486 EXPORT_SYMBOL(ieee80211_nullfunc_get); 5487 5488 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, 5489 const u8 *src_addr, 5490 const u8 *ssid, size_t ssid_len, 5491 size_t tailroom) 5492 { 5493 struct ieee80211_local *local = hw_to_local(hw); 5494 struct ieee80211_hdr_3addr *hdr; 5495 struct sk_buff *skb; 5496 size_t ie_ssid_len; 5497 u8 *pos; 5498 5499 ie_ssid_len = 2 + ssid_len; 5500 5501 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + 5502 ie_ssid_len + tailroom); 5503 if (!skb) 5504 return NULL; 5505 5506 skb_reserve(skb, local->hw.extra_tx_headroom); 5507 5508 hdr = skb_put_zero(skb, sizeof(*hdr)); 5509 hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 5510 IEEE80211_STYPE_PROBE_REQ); 5511 eth_broadcast_addr(hdr->addr1); 5512 memcpy(hdr->addr2, src_addr, ETH_ALEN); 5513 eth_broadcast_addr(hdr->addr3); 5514 5515 pos = skb_put(skb, ie_ssid_len); 5516 *pos++ = WLAN_EID_SSID; 5517 *pos++ = ssid_len; 5518 if (ssid_len) 5519 memcpy(pos, ssid, ssid_len); 5520 pos += ssid_len; 5521 5522 return skb; 5523 } 5524 EXPORT_SYMBOL(ieee80211_probereq_get); 5525 5526 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5527 const void *frame, size_t frame_len, 5528 const struct ieee80211_tx_info *frame_txctl, 5529 struct ieee80211_rts *rts) 5530 { 5531 const struct ieee80211_hdr *hdr = frame; 5532 5533 rts->frame_control = 5534 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); 5535 rts->duration = ieee80211_rts_duration(hw, vif, frame_len, 5536 frame_txctl); 5537 memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); 5538 memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); 5539 } 5540 EXPORT_SYMBOL(ieee80211_rts_get); 5541 5542 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 5543 const void *frame, size_t frame_len, 5544 const struct ieee80211_tx_info *frame_txctl, 5545 struct ieee80211_cts *cts) 5546 { 5547 const struct ieee80211_hdr *hdr = frame; 5548 5549 cts->frame_control = 5550 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); 5551 cts->duration = ieee80211_ctstoself_duration(hw, vif, 5552 frame_len, frame_txctl); 5553 memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); 5554 } 5555 EXPORT_SYMBOL(ieee80211_ctstoself_get); 5556 5557 struct sk_buff * 5558 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, 5559 struct ieee80211_vif *vif) 5560 { 5561 struct ieee80211_local *local = hw_to_local(hw); 5562 struct sk_buff *skb = NULL; 5563 struct ieee80211_tx_data tx; 5564 struct ieee80211_sub_if_data *sdata; 5565 struct ps_data *ps; 5566 struct ieee80211_tx_info *info; 5567 struct ieee80211_chanctx_conf *chanctx_conf; 5568 5569 sdata = vif_to_sdata(vif); 5570 5571 rcu_read_lock(); 5572 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5573 5574 if (!chanctx_conf) 5575 goto out; 5576 5577 if (sdata->vif.type == NL80211_IFTYPE_AP) { 5578 struct beacon_data *beacon = 5579 rcu_dereference(sdata->deflink.u.ap.beacon); 5580 5581 if (!beacon || !beacon->head) 5582 goto out; 5583 5584 ps = &sdata->u.ap.ps; 5585 } else if (ieee80211_vif_is_mesh(&sdata->vif)) { 5586 ps = &sdata->u.mesh.ps; 5587 } else { 5588 goto out; 5589 } 5590 5591 if (ps->dtim_count != 0 || !ps->dtim_bc_mc) 5592 goto out; /* send buffered bc/mc only after DTIM beacon */ 5593 5594 while (1) { 5595 skb = skb_dequeue(&ps->bc_buf); 5596 if (!skb) 5597 goto out; 5598 local->total_ps_buffered--; 5599 5600 if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { 5601 struct ieee80211_hdr *hdr = 5602 (struct ieee80211_hdr *) skb->data; 5603 /* more buffered multicast/broadcast frames ==> set 5604 * MoreData flag in IEEE 802.11 header to inform PS 5605 * STAs */ 5606 hdr->frame_control |= 5607 cpu_to_le16(IEEE80211_FCTL_MOREDATA); 5608 } 5609 5610 if (sdata->vif.type == NL80211_IFTYPE_AP) 5611 sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); 5612 if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb)) 5613 break; 5614 ieee80211_free_txskb(hw, skb); 5615 } 5616 5617 info = IEEE80211_SKB_CB(skb); 5618 5619 tx.flags |= IEEE80211_TX_PS_BUFFERED; 5620 info->band = chanctx_conf->def.chan->band; 5621 5622 if (invoke_tx_handlers(&tx)) 5623 skb = NULL; 5624 out: 5625 rcu_read_unlock(); 5626 5627 return skb; 5628 } 5629 EXPORT_SYMBOL(ieee80211_get_buffered_bc); 5630 5631 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5632 { 5633 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5634 struct ieee80211_sub_if_data *sdata = sta->sdata; 5635 struct ieee80211_local *local = sdata->local; 5636 int ret; 5637 u32 queues; 5638 5639 lockdep_assert_held(&local->sta_mtx); 5640 5641 /* only some cases are supported right now */ 5642 switch (sdata->vif.type) { 5643 case NL80211_IFTYPE_STATION: 5644 case NL80211_IFTYPE_AP: 5645 case NL80211_IFTYPE_AP_VLAN: 5646 break; 5647 default: 5648 WARN_ON(1); 5649 return -EINVAL; 5650 } 5651 5652 if (WARN_ON(tid >= IEEE80211_NUM_UPS)) 5653 return -EINVAL; 5654 5655 if (sta->reserved_tid == tid) { 5656 ret = 0; 5657 goto out; 5658 } 5659 5660 if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) { 5661 sdata_err(sdata, "TID reservation already active\n"); 5662 ret = -EALREADY; 5663 goto out; 5664 } 5665 5666 ieee80211_stop_vif_queues(sdata->local, sdata, 5667 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5668 5669 synchronize_net(); 5670 5671 /* Tear down BA sessions so we stop aggregating on this TID */ 5672 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) { 5673 set_sta_flag(sta, WLAN_STA_BLOCK_BA); 5674 __ieee80211_stop_tx_ba_session(sta, tid, 5675 AGG_STOP_LOCAL_REQUEST); 5676 } 5677 5678 queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]); 5679 __ieee80211_flush_queues(local, sdata, queues, false); 5680 5681 sta->reserved_tid = tid; 5682 5683 ieee80211_wake_vif_queues(local, sdata, 5684 IEEE80211_QUEUE_STOP_REASON_RESERVE_TID); 5685 5686 if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) 5687 clear_sta_flag(sta, WLAN_STA_BLOCK_BA); 5688 5689 ret = 0; 5690 out: 5691 return ret; 5692 } 5693 EXPORT_SYMBOL(ieee80211_reserve_tid); 5694 5695 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid) 5696 { 5697 struct sta_info *sta = container_of(pubsta, struct sta_info, sta); 5698 struct ieee80211_sub_if_data *sdata = sta->sdata; 5699 5700 lockdep_assert_held(&sdata->local->sta_mtx); 5701 5702 /* only some cases are supported right now */ 5703 switch (sdata->vif.type) { 5704 case NL80211_IFTYPE_STATION: 5705 case NL80211_IFTYPE_AP: 5706 case NL80211_IFTYPE_AP_VLAN: 5707 break; 5708 default: 5709 WARN_ON(1); 5710 return; 5711 } 5712 5713 if (tid != sta->reserved_tid) { 5714 sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid); 5715 return; 5716 } 5717 5718 sta->reserved_tid = IEEE80211_TID_UNRESERVED; 5719 } 5720 EXPORT_SYMBOL(ieee80211_unreserve_tid); 5721 5722 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, 5723 struct sk_buff *skb, int tid, int link_id, 5724 enum nl80211_band band) 5725 { 5726 const struct ieee80211_hdr *hdr = (void *)skb->data; 5727 int ac = ieee80211_ac_from_tid(tid); 5728 unsigned int link; 5729 5730 skb_reset_mac_header(skb); 5731 skb_set_queue_mapping(skb, ac); 5732 skb->priority = tid; 5733 5734 skb->dev = sdata->dev; 5735 5736 BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS); 5737 BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK, 5738 IEEE80211_LINK_UNSPECIFIED)); 5739 5740 if (!sdata->vif.valid_links) { 5741 link = 0; 5742 } else if (link_id >= 0) { 5743 link = link_id; 5744 } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) { 5745 /* address from the MLD */ 5746 link = IEEE80211_LINK_UNSPECIFIED; 5747 } else { 5748 /* otherwise must be addressed from a link */ 5749 rcu_read_lock(); 5750 for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) { 5751 struct ieee80211_bss_conf *link_conf; 5752 5753 link_conf = rcu_dereference(sdata->vif.link_conf[link]); 5754 if (!link_conf) 5755 continue; 5756 if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0) 5757 break; 5758 } 5759 rcu_read_unlock(); 5760 5761 if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf))) 5762 link = ffs(sdata->vif.valid_links) - 1; 5763 } 5764 5765 IEEE80211_SKB_CB(skb)->control.flags |= 5766 u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK); 5767 5768 /* 5769 * The other path calling ieee80211_xmit is from the tasklet, 5770 * and while we can handle concurrent transmissions locking 5771 * requirements are that we do not come into tx with bhs on. 5772 */ 5773 local_bh_disable(); 5774 IEEE80211_SKB_CB(skb)->band = band; 5775 ieee80211_xmit(sdata, NULL, skb); 5776 local_bh_enable(); 5777 } 5778 5779 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata, 5780 struct sk_buff *skb, int tid, int link_id) 5781 { 5782 struct ieee80211_chanctx_conf *chanctx_conf; 5783 enum nl80211_band band; 5784 5785 rcu_read_lock(); 5786 if (!sdata->vif.valid_links) { 5787 WARN_ON(link_id >= 0); 5788 chanctx_conf = 5789 rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 5790 if (WARN_ON(!chanctx_conf)) { 5791 rcu_read_unlock(); 5792 kfree_skb(skb); 5793 return; 5794 } 5795 band = chanctx_conf->def.chan->band; 5796 } else { 5797 WARN_ON(link_id >= 0 && 5798 !(sdata->vif.valid_links & BIT(link_id))); 5799 /* MLD transmissions must not rely on the band */ 5800 band = 0; 5801 } 5802 5803 __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band); 5804 rcu_read_unlock(); 5805 } 5806 5807 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, 5808 const u8 *buf, size_t len, 5809 const u8 *dest, __be16 proto, bool unencrypted, 5810 int link_id, u64 *cookie) 5811 { 5812 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5813 struct ieee80211_local *local = sdata->local; 5814 struct sta_info *sta; 5815 struct sk_buff *skb; 5816 struct ethhdr *ehdr; 5817 u32 ctrl_flags = 0; 5818 u32 flags = 0; 5819 int err; 5820 5821 /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE 5822 * or Pre-Authentication 5823 */ 5824 if (proto != sdata->control_port_protocol && 5825 proto != cpu_to_be16(ETH_P_PREAUTH)) 5826 return -EINVAL; 5827 5828 if (proto == sdata->control_port_protocol) 5829 ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO | 5830 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP; 5831 5832 if (unencrypted) 5833 flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 5834 5835 if (cookie) 5836 ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 5837 5838 flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX; 5839 5840 skb = dev_alloc_skb(local->hw.extra_tx_headroom + 5841 sizeof(struct ethhdr) + len); 5842 if (!skb) 5843 return -ENOMEM; 5844 5845 skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr)); 5846 5847 skb_put_data(skb, buf, len); 5848 5849 ehdr = skb_push(skb, sizeof(struct ethhdr)); 5850 memcpy(ehdr->h_dest, dest, ETH_ALEN); 5851 5852 /* we may override the SA for MLO STA later */ 5853 if (link_id < 0) { 5854 ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED, 5855 IEEE80211_TX_CTRL_MLO_LINK); 5856 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5857 } else { 5858 struct ieee80211_bss_conf *link_conf; 5859 5860 ctrl_flags |= u32_encode_bits(link_id, 5861 IEEE80211_TX_CTRL_MLO_LINK); 5862 5863 rcu_read_lock(); 5864 link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); 5865 if (!link_conf) { 5866 dev_kfree_skb(skb); 5867 rcu_read_unlock(); 5868 return -ENOLINK; 5869 } 5870 memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN); 5871 rcu_read_unlock(); 5872 } 5873 5874 ehdr->h_proto = proto; 5875 5876 skb->dev = dev; 5877 skb->protocol = proto; 5878 skb_reset_network_header(skb); 5879 skb_reset_mac_header(skb); 5880 5881 /* update QoS header to prioritize control port frames if possible, 5882 * priorization also happens for control port frames send over 5883 * AF_PACKET 5884 */ 5885 rcu_read_lock(); 5886 err = ieee80211_lookup_ra_sta(sdata, skb, &sta); 5887 if (err) { 5888 rcu_read_unlock(); 5889 return err; 5890 } 5891 5892 if (!IS_ERR(sta)) { 5893 u16 queue = __ieee80211_select_queue(sdata, sta, skb); 5894 5895 skb_set_queue_mapping(skb, queue); 5896 skb_get_hash(skb); 5897 5898 /* 5899 * for MLO STA, the SA should be the AP MLD address, but 5900 * the link ID has been selected already 5901 */ 5902 if (sta->sta.mlo) 5903 memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN); 5904 } 5905 rcu_read_unlock(); 5906 5907 /* mutex lock is only needed for incrementing the cookie counter */ 5908 mutex_lock(&local->mtx); 5909 5910 local_bh_disable(); 5911 __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie); 5912 local_bh_enable(); 5913 5914 mutex_unlock(&local->mtx); 5915 5916 return 0; 5917 } 5918 5919 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev, 5920 const u8 *buf, size_t len) 5921 { 5922 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); 5923 struct ieee80211_local *local = sdata->local; 5924 struct sk_buff *skb; 5925 5926 skb = dev_alloc_skb(local->hw.extra_tx_headroom + len + 5927 30 + /* header size */ 5928 18); /* 11s header size */ 5929 if (!skb) 5930 return -ENOMEM; 5931 5932 skb_reserve(skb, local->hw.extra_tx_headroom); 5933 skb_put_data(skb, buf, len); 5934 5935 skb->dev = dev; 5936 skb->protocol = htons(ETH_P_802_3); 5937 skb_reset_network_header(skb); 5938 skb_reset_mac_header(skb); 5939 5940 local_bh_disable(); 5941 __ieee80211_subif_start_xmit(skb, skb->dev, 0, 5942 IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP, 5943 NULL); 5944 local_bh_enable(); 5945 5946 return 0; 5947 } 5948